changeset 1355:3fdd8c5a0195 fuzz

merge main to fuzz
author Matt Johnston <matt@ucc.asn.au>
date Thu, 18 May 2017 23:45:10 +0800
parents 7618759e9327 (current diff) bbc0a0ee3843 (diff)
children 3677a510f545
files Makefile.in buffer.c common-kex.c dbrandom.c netio.c runopts.h svr-auth.c svr-runopts.c svr-session.c
diffstat 88 files changed, 2149 insertions(+), 1606 deletions(-) [+]
line wrap: on
line diff
--- a/.hgsigs	Thu May 18 23:38:30 2017 +0800
+++ b/.hgsigs	Thu May 18 23:45:10 2017 +0800
@@ -20,3 +20,6 @@
 5bb5976e6902a0c9fba974a880c68c9487ee1e77 0 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
 926e7275cef4f4f2a4251597ee4814748394824c 0 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
 fd1981f41c626a969f07b4823848deaefef3c8aa 0 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
+70705edee9dd29cd3d410f19fbd15cc3489313e2 0 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
+9030ffdbe5625e35ed7189ab84a41dfc8d413e9c 0 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
+5c9207ceedaea794f958224c19214d66af6e2d56 0 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
--- a/.hgtags	Thu May 18 23:38:30 2017 +0800
+++ b/.hgtags	Thu May 18 23:45:10 2017 +0800
@@ -52,3 +52,6 @@
 79a6ef02307d05cb9dda10465cb5b807baa8f62e DROPBEAR_2015.70
 9a944a243f08be6b22d32f166a0690eb4872462b DROPBEAR_2015.71
 78b12b6549be08b0bea3da329b2578060a76ca31 DROPBEAR_2016.72
+309e1c4a87682b6ca7d80b8555a1db416c3cb7ac DROPBEAR_2016.73
+0ed3d2bbf956cb8a9bf0f4b5a86b7dd9688205cb DROPBEAR_2016.74
+c31276613181c5cff7854e7ef586ace03424e55e DROPBEAR_2017.75
--- a/.travis.yml	Thu May 18 23:38:30 2017 +0800
+++ b/.travis.yml	Thu May 18 23:45:10 2017 +0800
@@ -41,7 +41,9 @@
 script:
   - autoconf && autoheader && ./configure "$BUNDLEDLIBTOM" CFLAGS="-O2 -Wall -Wno-pointer-sign $WEXTRAFLAGS" --prefix="$HOME/inst"
   - if [ "$NOWRITEV" = "1" ]; then sed -i -e s/HAVE_WRITEV/DONT_HAVE_WRITEV/ config.h ; fi
-  - make -j3 install
+  - make -j3 
+  # avoid concurrent install, osx/freebsd is racey (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208093)
+  - make install 
 
 after_success:
   - ~/inst/bin/dropbearkey -t rsa -f testrsa
--- a/CHANGES	Thu May 18 23:38:30 2017 +0800
+++ b/CHANGES	Thu May 18 23:45:10 2017 +0800
@@ -1,3 +1,28 @@
+2017.75 - 18 May 2017
+
+- Security: Fix double-free in server TCP listener cleanup
+  A double-free in the server could be triggered by an authenticated user if
+  dropbear is running with -a (Allow connections to forwarded ports from any host)
+  This could potentially allow arbitrary code execution as root by an authenticated user.
+  Affects versions 2013.56 to 2016.74. Thanks to Mark Shepard for reporting the crash.
+
+- Security: Fix information disclosure with ~/.ssh/authorized_keys symlink.
+  Dropbear parsed authorized_keys as root, even if it were a symlink. The fix
+  is to switch to user permissions when opening authorized_keys
+
+  A user could symlink their ~/.ssh/authorized_keys to a root-owned file they
+  couldn't normally read. If they managed to get that file to contain valid
+  authorized_keys with command= options it might be possible to read other
+  contents of that file.
+  This information disclosure is to an already authenticated user.
+  Thanks to Jann Horn of Google Project Zero for reporting this.
+
+- Generate hostkeys with dropbearkey atomically and flush to disk with fsync
+  Thanks to Andrei Gherzan for a patch
+
+- Fix out of tree builds with bundled libtom
+  Thanks to Henrik Nordström and Peter Krefting for patches.
+
 2016.74 - 21 July 2016
 
 - Security: Message printout was vulnerable to format string injection.
@@ -9,16 +34,24 @@
   A dbclient user who can control username or host arguments could potentially
   run arbitrary code as the dbclient user. This could be a problem if scripts
   or webpages pass untrusted input to the dbclient program.
+  CVE-2016-7406
+  https://secure.ucc.asn.au/hg/dropbear/rev/b66a483f3dcb
 
 - Security: dropbearconvert import of OpenSSH keys could run arbitrary code as
   the local dropbearconvert user when parsing malicious key files
+  CVE-2016-7407
+  https://secure.ucc.asn.au/hg/dropbear/rev/34e6127ef02e
 
 - Security: dbclient could run arbitrary code as the local dbclient user if
   particular -m or -c arguments are provided. This could be an issue where
   dbclient is used in scripts.
+  CVE-2016-7408
+  https://secure.ucc.asn.au/hg/dropbear/rev/eed9376a4ad6
 
 - Security: dbclient or dropbear server could expose process memory to the
   running user if compiled with DEBUG_TRACE and running with -v
+  CVE-2016-7409
+  https://secure.ucc.asn.au/hg/dropbear/rev/6a14b1f6dc04
 
   The security issues were reported by an anonymous researcher working with
   Beyond Security's SecuriTeam Secure Disclosure www.beyondsecurity.com/ssd.html
@@ -64,6 +97,7 @@
 
 - Validate X11 forwarding input. Could allow bypass of authorized_keys command= restrictions,
   found by github.com/tintinweb. Thanks for Damien Miller for a patch. CVE-2016-3116
+  https://secure.ucc.asn.au/hg/dropbear/rev/a3e8389e01ff
 
 2015.71 - 3 December 2015
 
@@ -342,9 +376,11 @@
 - Limit the size of decompressed payloads, avoids memory exhaustion denial
   of service 
   Thanks to Logan Lamb for reporting and investigating it. CVE-2013-4421
+  https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6f
 
 - Avoid disclosing existence of valid users through inconsistent delays
   Thanks to Logan Lamb for reporting. CVE-2013-4434
+  https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
 
 - Update config.guess and config.sub for newer architectures
 
@@ -447,6 +483,7 @@
   This bug affects releases 0.52 onwards. Ref CVE-2012-0920.
   Thanks to Danny Fullerton of Mantor Organization for reporting
   the bug.
+  https://secure.ucc.asn.au/hg/dropbear/rev/818108bf7749
 
 - Compile fix, only apply IPV6 socket options if they are available in headers
   Thanks to Gustavo Zacarias for the patch
--- a/Makefile.in	Thu May 18 23:38:30 2017 +0800
+++ b/Makefile.in	Thu May 18 23:45:10 2017 +0800
@@ -24,6 +24,10 @@
 LIBTOM_LIBS=$(STATIC_LTC) $(STATIC_LTM) 
 endif
 
+ifneq ($(wildcard localoptions.h),)
+CFLAGS+=-DLOCALOPTIONS_H_EXISTS
+endif
+
 COMMONOBJS=dbutil.o buffer.o dbhelpers.o \
 		dss.o bignum.o \
 		signkey.o rsa.o dbrandom.o \
@@ -76,6 +80,8 @@
 [email protected]@
 [email protected]@
 
+.DELETE_ON_ERROR:
+
 [email protected]@
 [email protected]@
 [email protected]@
@@ -155,7 +161,6 @@
 
 inst_dropbearmulti: $(addprefix insmulti, $(PROGRAMS)) 
 
-
 # for some reason the rule further down doesn't like $([email protected]) as a prereq.
 dropbear: $(dropbearobjs)
 dbclient: $(dbclientobjs)
@@ -195,18 +200,18 @@
 	-ln -s dropbearmulti$(EXEEXT) $*$(EXEEXT)
 
 $(STATIC_LTC): options.h
-	cd libtomcrypt && $(MAKE)
+	$(MAKE) -C libtomcrypt
 
 $(STATIC_LTM): options.h
-	cd libtommath && $(MAKE)
+	$(MAKE) -C libtommath
 
 .PHONY : clean sizes thisclean distclean tidy ltc-clean ltm-clean
 
 ltc-clean:
-	cd libtomcrypt && $(MAKE) clean
+	$(MAKE) -C libtomcrypt clean
 
 ltm-clean:
-	cd libtommath && $(MAKE) clean
+	$(MAKE) -C libtommath clean
 
 sizes: dropbear
 	objdump -t dropbear|grep ".text"|cut -d "." -f 2|sort -rn
@@ -224,6 +229,14 @@
 tidy:
 	-rm -f *~ *.gcov */*~
 
+# default_options.h is stored in version control, could not find a workaround
+# for parallel "make -j" and dependency rules.
+default_options.h: default_options.h.in 
+	echo "# > > > Generated from $^, edit that file instead !" > [email protected]
+	echo >> [email protected]
+	$(srcdir)/ifndef_wrapper.sh < $^ > [email protected]
+	mv [email protected] [email protected]
+
 ## Fuzzing targets
 
 # list of fuzz targets
@@ -257,4 +270,3 @@
 	/usr/bin/xxd -i -a keyr >> hostkeys.c
 	/usr/bin/xxd -i -a keye >> hostkeys.c
 	/usr/bin/xxd -i -a keyd >> hostkeys.c
-
--- a/agentfwd.h	Thu May 18 23:38:30 2017 +0800
+++ b/agentfwd.h	Thu May 18 23:45:10 2017 +0800
@@ -30,7 +30,7 @@
 #include "auth.h"
 #include "list.h"
 
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 
 /* An agent reply can be reasonably large, as it can
  * contain a list of all public keys held by the agent.
@@ -50,14 +50,14 @@
 
 extern const struct ChanType cli_chan_agent;
 
-#endif /* ENABLE_CLI_AGENTFWD */
+#endif /* DROPBEAR_CLI_AGENTFWD */
 
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 
 int svr_agentreq(struct ChanSess * chansess);
 void svr_agentcleanup(struct ChanSess * chansess);
 void svr_agentset(struct ChanSess *chansess);
 
-#endif /* ENABLE_SVR_AGENTFWD */
+#endif /* DROPBEAR_SVR_AGENTFWD */
 
 #endif /* DROPBEAR_AGENTFWD_H_ */
--- a/algo.h	Thu May 18 23:38:30 2017 +0800
+++ b/algo.h	Thu May 18 23:45:10 2017 +0800
@@ -83,9 +83,15 @@
 };
 
 enum dropbear_kex_mode {
+#if DROPBEAR_NORMAL_DH
 	DROPBEAR_KEX_NORMAL_DH,
+#endif
+#if DROPBEAR_ECDH
 	DROPBEAR_KEX_ECDH,
+#endif
+#if DROPBEAR_CURVE25519
 	DROPBEAR_KEX_CURVE25519,
+#endif
 };
 
 struct dropbear_kex {
@@ -96,7 +102,7 @@
 	const int dh_p_len;
 
 	/* elliptic curve DH KEX */
-#ifdef DROPBEAR_ECDH
+#if DROPBEAR_ECDH
 	const struct dropbear_ecc_curve *ecc_curve;
 #else
 	const void* dummy;
@@ -122,7 +128,7 @@
 algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
 		enum kexguess2_used *kexguess2, int *goodguess);
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 int check_user_algos(const char* user_algo_list, algo_type * algos, 
 		const char *algo_desc);
 char * algolist_string(algo_type algos[]);
--- a/atomicio.c	Thu May 18 23:38:30 2017 +0800
+++ b/atomicio.c	Thu May 18 23:45:10 2017 +0800
@@ -1,6 +1,8 @@
+/* $OpenBSD: atomicio.c,v 1.17 2006/04/01 05:51:34 djm Exp $ */
 /*
- * Copied from OpenSSH 3.6.1p2.
+ * Copied from OpenSSH/OpenBSD.
  * 
+ * Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
  * All rights reserved.
  *
@@ -25,39 +27,32 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/* RCSID("OpenBSD: atomicio.c,v 1.10 2001/05/08 22:48:07 markus Exp "); */
+#include "includes.h"
 
 #include "atomicio.h"
 
 /*
- * ensure all of data on socket comes through. f==read || f==write
+ * ensure all of data on socket comes through. f==read || f==vwrite
  */
-ssize_t
-atomicio(f, fd, _s, n)
-	ssize_t (*f) ();
-	int fd;
-	void *_s;
-	size_t n;
+size_t
+atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
 {
 	char *s = _s;
+	size_t pos = 0;
 	ssize_t res;
-	size_t pos = 0;
 
 	while (n > pos) {
 		res = (f) (fd, s + pos, n - pos);
 		switch (res) {
 		case -1:
-#ifdef EWOULDBLOCK
-			if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK)
-#else
 			if (errno == EINTR || errno == EAGAIN)
-#endif
 				continue;
-			/* FALLTHROUGH */
+			return 0;
 		case 0:
-			return (res);
+			errno = EPIPE;
+			return pos;
 		default:
-			pos += res;
+			pos += (size_t)res;
 		}
 	}
 	return (pos);
--- a/atomicio.h	Thu May 18 23:38:30 2017 +0800
+++ b/atomicio.h	Thu May 18 23:45:10 2017 +0800
@@ -1,8 +1,7 @@
+/* $OpenBSD: atomicio.h,v 1.7 2006/03/25 22:22:42 djm Exp $ */
 
 /*
- * Copied from OpenSSH 3.6.1p2, required for loginrec.c
- *
- * $OpenBSD: atomicio.h,v 1.4 2001/06/26 06:32:46 itojun Exp $
+ * Copied from OpenSSH/OpenBSD, required for loginrec.c
  *
  * Copyright (c) 1995,1999 Theo de Raadt.  All rights reserved.
  * All rights reserved.
@@ -28,9 +27,9 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "includes.h"
+/*
+ * Ensure all of data on socket comes through. f==read || f==vwrite
+ */
+size_t	atomicio(ssize_t (*)(int, void *, size_t), int, void *, size_t);
 
-/*
- * Ensure all of data on socket comes through. f==read || f==write
- */
-ssize_t	atomicio(ssize_t (*)(), int, void *, size_t);
+#define vwrite (ssize_t (*)(int, void *, size_t))write
--- a/auth.h	Thu May 18 23:38:30 2017 +0800
+++ b/auth.h	Thu May 18 23:45:10 2017 +0800
@@ -41,7 +41,7 @@
 void svr_auth_pubkey(void);
 void svr_auth_pam(void);
 
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 int svr_pubkey_allows_agentfwd(void);
 int svr_pubkey_allows_tcpfwd(void);
 int svr_pubkey_allows_x11fwd(void);
@@ -119,12 +119,12 @@
 	char *pw_shell;
 	char *pw_name;
 	char *pw_passwd;
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	struct PubKeyOptions* pubkey_options;
 #endif
 };
 
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 struct PubKeyOptions;
 struct PubKeyOptions {
 	/* Flags */
--- a/buffer.c	Thu May 18 23:38:30 2017 +0800
+++ b/buffer.c	Thu May 18 23:45:10 2017 +0800
@@ -109,7 +109,7 @@
 		dropbear_exit("Bad buf_setlen");
 	}
 	buf->len = len;
-	buf->pos = 0;
+	buf->pos = MIN(buf->pos, buf->len);
 }
 
 /* Increment the length of the buffer */
--- a/channel.h	Thu May 18 23:38:30 2017 +0800
+++ b/channel.h	Thu May 18 23:45:10 2017 +0800
@@ -126,11 +126,11 @@
 void common_recv_msg_channel_data(struct Channel *channel, int fd, 
 		circbuffer * buf);
 
-#ifdef DROPBEAR_CLIENT
+#if DROPBEAR_CLIENT
 extern const struct ChanType clichansess;
 #endif
 
-#if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
+#if DROPBEAR_LISTENERS || DROPBEAR_CLIENT
 int send_msg_channel_open_init(int fd, const struct ChanType *type);
 void recv_msg_channel_open_confirmation(void);
 void recv_msg_channel_open_failure(void);
--- a/chansession.h	Thu May 18 23:38:30 2017 +0800
+++ b/chansession.h	Thu May 18 23:45:10 2017 +0800
@@ -58,7 +58,7 @@
 	/* Used to set $SSH_CLIENT in the child session. */
 	char *client_string;
 	
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 	struct Listener * x11listener;
 	int x11port;
 	char * x11authprot;
@@ -67,13 +67,13 @@
 	unsigned char x11singleconn;
 #endif
 
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 	struct Listener * agentlistener;
 	char * agentfile;
 	char * agentdir;
 #endif
 
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	char *original_command;
 #endif
 };
@@ -89,7 +89,7 @@
 void cli_send_chansess_request(void);
 void cli_tty_cleanup(void);
 void cli_chansess_winchange(void);
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 void cli_send_netcat_request(void);
 #endif
 
--- a/cli-agentfwd.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-agentfwd.c	Thu May 18 23:45:10 2017 +0800
@@ -24,7 +24,7 @@
 
 #include "includes.h"
 
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 
 #include "agentfwd.h"
 #include "session.h"
@@ -130,7 +130,7 @@
 	}
 	buf_setpos(payload, 0);
 
-	ret = atomicio(write, fd, buf_getptr(payload, payload->len), payload->len);
+	ret = atomicio(vwrite, fd, buf_getptr(payload, payload->len), payload->len);
 	if ((size_t)ret != payload->len) {
 		TRACE(("write failed fd %d for agent_request, %s", fd, strerror(errno)))
 		goto out;
--- a/cli-auth.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-auth.c	Thu May 18 23:45:10 2017 +0800
@@ -51,7 +51,7 @@
 
 	encrypt_packet();
 
-#ifdef DROPBEAR_CLI_IMMEDIATE_AUTH
+#if DROPBEAR_CLI_IMMEDIATE_AUTH
 	/* We can't haven't two auth requests in-flight with delayed zlib mode
 	since if the first one succeeds then the remote side will 
 	expect the second one to be compressed. 
@@ -78,6 +78,7 @@
 	char* banner = NULL;
 	unsigned int bannerlen;
 	unsigned int i, linecount;
+	int truncated = 0;
 
 	TRACE(("enter recv_msg_userauth_banner"))
 	if (ses.authstate.authdone) {
@@ -90,26 +91,29 @@
 
 	if (bannerlen > MAX_BANNER_SIZE) {
 		TRACE(("recv_msg_userauth_banner: bannerlen too long: %d", bannerlen))
-		goto out;
+		truncated = 1;
+	} else {
+		cleantext(banner);
+
+		/* Limit to 24 lines */
+		linecount = 1;
+		for (i = 0; i < bannerlen; i++) {
+			if (banner[i] == '\n') {
+				if (linecount >= MAX_BANNER_LINES) {
+					banner[i] = '\0';
+					truncated = 1;
+					break;
+				}
+				linecount++;
+			}
+		}
+		fprintf(stderr, "%s\n", banner);
 	}
 
-	cleantext(banner);
-
-	/* Limit to 25 lines */
-	linecount = 1;
-	for (i = 0; i < bannerlen; i++) {
-		if (banner[i] == '\n') {
-			if (linecount >= MAX_BANNER_LINES) {
-				banner[i] = '\0';
-				break;
-			}
-			linecount++;
-		}
+	if (truncated) {
+		fprintf(stderr, "[Banner from the server is too long]\n");
 	}
 
-	fprintf(stderr, "%s\n", banner);
-
-out:
 	m_free(banner);
 	TRACE(("leave recv_msg_userauth_banner"))
 }
@@ -121,21 +125,21 @@
  * SSH_MSG_USERAUTH_INFO_REQUEST. */
 void recv_msg_userauth_specific_60() {
 
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
 		recv_msg_userauth_pk_ok();
 		return;
 	}
 #endif
 
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 	if (cli_ses.lastauthtype == AUTH_TYPE_INTERACT) {
 		recv_msg_userauth_info_request();
 		return;
 	}
 #endif
 
-#ifdef ENABLE_CLI_PASSWORD_AUTH
+#if DROPBEAR_CLI_PASSWORD_AUTH
 	if (cli_ses.lastauthtype == AUTH_TYPE_PASSWORD) {
 		/* Eventually there could be proper password-changing
 		 * support. However currently few servers seem to
@@ -179,7 +183,7 @@
 		TRACE(("leave recv_msg_userauth_failure, ignored response, state set to USERAUTH_REQ_SENT"));
 		return;
 	} else  {
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 		/* If it was a pubkey auth request, we should cross that key 
 		 * off the list. */
 		if (cli_ses.lastauthtype == AUTH_TYPE_PUBKEY) {
@@ -187,7 +191,7 @@
 		}
 #endif
 
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 		/* If we get a failure message for keyboard interactive without
 		 * receiving any request info packet, then we don't bother trying
 		 * keyboard interactive again */
@@ -227,19 +231,19 @@
 	for (i = 0; i <= methlen; i++) {
 		if (methods[i] == '\0') {
 			TRACE(("auth method '%s'", tok))
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 			if (strncmp(AUTH_METHOD_PUBKEY, tok,
 				AUTH_METHOD_PUBKEY_LEN) == 0) {
 				ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
 			}
 #endif
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 			if (strncmp(AUTH_METHOD_INTERACT, tok,
 				AUTH_METHOD_INTERACT_LEN) == 0) {
 				ses.authstate.authtypes |= AUTH_TYPE_INTERACT;
 			}
 #endif
-#ifdef ENABLE_CLI_PASSWORD_AUTH
+#if DROPBEAR_CLI_PASSWORD_AUTH
 			if (strncmp(AUTH_METHOD_PASSWORD, tok,
 				AUTH_METHOD_PASSWORD_LEN) == 0) {
 				ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
@@ -267,7 +271,7 @@
 	cli_ses.state = USERAUTH_SUCCESS_RCVD;
 	cli_ses.lastauthtype = AUTH_TYPE_NONE;
 
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	cli_auth_pubkey_cleanup();
 #endif
 }
@@ -281,14 +285,14 @@
 	
 	/* Order to try is pubkey, interactive, password.
 	 * As soon as "finished" is set for one, we don't do any more. */
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	if (ses.authstate.authtypes & AUTH_TYPE_PUBKEY) {
 		finished = cli_auth_pubkey();
 		cli_ses.lastauthtype = AUTH_TYPE_PUBKEY;
 	}
 #endif
 
-#ifdef ENABLE_CLI_PASSWORD_AUTH
+#if DROPBEAR_CLI_PASSWORD_AUTH
 	if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
 		if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
 			fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
@@ -300,7 +304,7 @@
 	}
 #endif
 
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 	if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
 		if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
 			fprintf(stderr, "Sorry, I won't let you use interactive auth unencrypted.\n");
@@ -324,7 +328,7 @@
 	return DROPBEAR_FAILURE;
 }
 
-#if defined(ENABLE_CLI_PASSWORD_AUTH) || defined(ENABLE_CLI_INTERACT_AUTH)
+#if DROPBEAR_CLI_PASSWORD_AUTH || DROPBEAR_CLI_INTERACT_AUTH
 /* A helper for getpass() that exits if the user cancels. The returned
  * password is statically allocated by getpass() */
 char* getpass_or_cancel(char* prompt)
--- a/cli-authinteract.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-authinteract.c	Thu May 18 23:45:10 2017 +0800
@@ -29,7 +29,7 @@
 #include "ssh.h"
 #include "runopts.h"
 
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 
 static char* get_response(char* prompt)
 {
@@ -172,4 +172,4 @@
 	TRACE(("leave cli_auth_interactive"))
 
 }
-#endif	/* ENABLE_CLI_INTERACT_AUTH */
+#endif	/* DROPBEAR_CLI_INTERACT_AUTH */
--- a/cli-authpasswd.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-authpasswd.c	Thu May 18 23:45:10 2017 +0800
@@ -29,9 +29,9 @@
 #include "ssh.h"
 #include "runopts.h"
 
-#ifdef ENABLE_CLI_PASSWORD_AUTH
+#if DROPBEAR_CLI_PASSWORD_AUTH
 
-#ifdef ENABLE_CLI_ASKPASS_HELPER
+#if DROPBEAR_CLI_ASKPASS_HELPER
 /* Returns 1 if we want to use the askpass program, 0 otherwise */
 static int want_askpass()
 {
@@ -113,7 +113,7 @@
 	TRACE(("leave gui_getpass"))
 	return(buf);
 }
-#endif /* ENABLE_CLI_ASKPASS_HELPER */
+#endif /* DROPBEAR_CLI_ASKPASS_HELPER */
 
 void cli_auth_password() {
 
@@ -125,7 +125,7 @@
 
 	snprintf(prompt, sizeof(prompt), "%[email protected]%s's password: ", 
 				cli_opts.username, cli_opts.remotehost);
-#ifdef ENABLE_CLI_ASKPASS_HELPER
+#if DROPBEAR_CLI_ASKPASS_HELPER
 	if (want_askpass())
 	{
 		password = gui_getpass(prompt);
@@ -158,4 +158,4 @@
 
 	TRACE(("leave cli_auth_password"))
 }
-#endif	/* ENABLE_CLI_PASSWORD_AUTH */
+#endif	/* DROPBEAR_CLI_PASSWORD_AUTH */
--- a/cli-authpubkey.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-authpubkey.c	Thu May 18 23:45:10 2017 +0800
@@ -32,7 +32,7 @@
 #include "auth.h"
 #include "agentfwd.h"
 
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 static void send_msg_userauth_pubkey(sign_key *key, int type, int realsign);
 
 /* Called when we receive a SSH_MSG_USERAUTH_FAILURE for a pubkey request.
@@ -122,7 +122,7 @@
 
 void cli_buf_put_sign(buffer* buf, sign_key *key, int type, 
 			buffer *data_buf) {
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	if (key->source == SIGNKEY_SOURCE_AGENT) {
 		/* Format the agent signature ourselves, as buf_put_sign would. */
 		buffer *sigblob;
@@ -131,7 +131,7 @@
 		buf_putbufstring(buf, sigblob);
 		buf_free(sigblob);
 	} else 
-#endif /* ENABLE_CLI_AGENTFWD */
+#endif /* DROPBEAR_CLI_AGENTFWD */
 	{
 		buf_put_sign(buf, key, type, data_buf);
 	}
@@ -185,7 +185,7 @@
 
 	TRACE(("enter cli_auth_pubkey"))
 
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	if (!cli_opts.agent_keys_loaded) {
 		/* get the list of available keys from the agent */
 		cli_load_agent_keys(cli_opts.privkeys);
@@ -209,7 +209,7 @@
 
 void cli_auth_pubkey_cleanup() {
 
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	m_close(cli_opts.agent_fd);
 	cli_opts.agent_fd = -1;
 #endif
--- a/cli-chansession.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-chansession.c	Thu May 18 23:45:10 2017 +0800
@@ -355,7 +355,7 @@
 
 	cli_init_stdpipe_sess(channel);
 
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	if (cli_opts.agent_fwd) {
 		cli_setup_agent(channel);
 	}
@@ -379,7 +379,7 @@
 	return 0; /* Success */
 }
 
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 
 static const struct ChanType cli_chan_netcat = {
 	0, /* sepfds */
--- a/cli-kex.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-kex.c	Thu May 18 23:45:10 2017 +0800
@@ -48,6 +48,7 @@
 	CHECKCLEARTOWRITE();
 	buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
 	switch (ses.newkeys->algo_kex->mode) {
+#if DROPBEAR_NORMAL_DH
 		case DROPBEAR_KEX_NORMAL_DH:
 			if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
 				|| !cli_ses.dh_param) {
@@ -58,8 +59,9 @@
 			}
 			buf_putmpint(ses.writepayload, &cli_ses.dh_param->pub);
 			break;
+#endif
+#if DROPBEAR_ECDH
 		case DROPBEAR_KEX_ECDH:
-#ifdef DROPBEAR_ECDH
 			if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
 				|| !cli_ses.ecdh_param) {
 				if (cli_ses.ecdh_param) {
@@ -68,9 +70,9 @@
 				cli_ses.ecdh_param = gen_kexecdh_param();
 			}
 			buf_put_ecc_raw_pubkey_string(ses.writepayload, &cli_ses.ecdh_param->key);
+			break;
 #endif
-			break;
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 		case DROPBEAR_KEX_CURVE25519:
 			if (ses.newkeys->algo_kex != cli_ses.param_kex_algo
 				|| !cli_ses.curve25519_param) {
@@ -80,8 +82,8 @@
 				cli_ses.curve25519_param = gen_kexcurve25519_param();
 			}
 			buf_putstring(ses.writepayload, (const char*)cli_ses.curve25519_param->pub, CURVE25519_LEN);
+			break;
 #endif
-			break;
 	}
 
 	cli_ses.param_kex_algo = ses.newkeys->algo_kex;
@@ -118,6 +120,7 @@
 	}
 
 	switch (ses.newkeys->algo_kex->mode) {
+#if DROPBEAR_NORMAL_DH
 		case DROPBEAR_KEX_NORMAL_DH:
 			{
 			DEF_MP_INT(dh_f);
@@ -131,37 +134,38 @@
 			mp_clear(&dh_f);
 			}
 			break;
+#endif
+#if DROPBEAR_ECDH
 		case DROPBEAR_KEX_ECDH:
-#ifdef DROPBEAR_ECDH
 			{
 			buffer *ecdh_qs = buf_getstringbuf(ses.payload);
 			kexecdh_comb_key(cli_ses.ecdh_param, ecdh_qs, hostkey);
 			buf_free(ecdh_qs);
 			}
+			break;
 #endif
-			break;
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 		case DROPBEAR_KEX_CURVE25519:
 			{
 			buffer *ecdh_qs = buf_getstringbuf(ses.payload);
 			kexcurve25519_comb_key(cli_ses.curve25519_param, ecdh_qs, hostkey);
 			buf_free(ecdh_qs);
 			}
+			break;
 #endif
-			break;
 	}
 
 	if (cli_ses.dh_param) {
 		free_kexdh_param(cli_ses.dh_param);
 		cli_ses.dh_param = NULL;
 	}
-#ifdef DROPBEAR_ECDH
+#if DROPBEAR_ECDH
 	if (cli_ses.ecdh_param) {
 		free_kexecdh_param(cli_ses.ecdh_param);
 		cli_ses.ecdh_param = NULL;
 	}
 #endif
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 	if (cli_ses.curve25519_param) {
 		free_kexcurve25519_param(cli_ses.curve25519_param);
 		cli_ses.curve25519_param = NULL;
--- a/cli-main.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-main.c	Thu May 18 23:45:10 2017 +0800
@@ -35,13 +35,13 @@
 static void cli_dropbear_exit(int exitcode, const char* format, va_list param) ATTRIB_NORETURN;
 static void cli_dropbear_log(int priority, const char* format, va_list param);
 
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out);
 static void kill_proxy_sighandler(int signo);
 #endif
 
-#if defined(DBMULTI_dbclient) || !defined(DROPBEAR_MULTI)
-#if defined(DBMULTI_dbclient) && defined(DROPBEAR_MULTI)
+#if defined(DBMULTI_dbclient) || !DROPBEAR_MULTI
+#if defined(DBMULTI_dbclient) && DROPBEAR_MULTI
 int cli_main(int argc, char ** argv) {
 #else
 int main(int argc, char ** argv) {
@@ -74,7 +74,7 @@
 	}
 
 	pid_t proxy_cmd_pid = 0;
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 	if (cli_opts.proxycmd) {
 		cli_proxy_cmd(&sock_in, &sock_out, &proxy_cmd_pid);
 		m_free(cli_opts.proxycmd);
@@ -151,7 +151,7 @@
 	dropbear_exit("Failed to run '%s'\n", cmd);
 }
 
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out) {
 	char * ex_cmd = NULL;
 	size_t ex_cmdlen;
@@ -176,4 +176,4 @@
 	kill_proxy_command();
 	_exit(1);
 }
-#endif /* ENABLE_CLI_PROXYCMD */
+#endif /* DROPBEAR_CLI_PROXYCMD */
--- a/cli-runopts.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-runopts.c	Thu May 18 23:45:10 2017 +0800
@@ -37,13 +37,13 @@
 static void parse_hostname(const char* orighostarg);
 static void parse_multihop_hostname(const char* orighostarg, const char* argv0);
 static void fill_own_user(void);
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 static void loadidentityfile(const char* filename, int warnfail);
 #endif
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 static void addforward(const char* str, m_list *fwdlist);
 #endif
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 static void add_netcat(const char *str);
 #endif
 static void add_extendedopt(const char *str);
@@ -51,7 +51,7 @@
 static void printhelp() {
 
 	fprintf(stderr, "Dropbear SSH client v%s https://matt.ucc.asn.au/dropbear/dropbear.html\n"
-#ifdef ENABLE_CLI_MULTIHOP
+#if DROPBEAR_CLI_MULTIHOP
 					"Usage: %s [options] [[email protected]]host[/port][,[[email protected]]host/port],...] [command]\n"
 #else
 					"Usage: %s [options] [[email protected]]host[/port] [command]\n"
@@ -66,38 +66,38 @@
 					"-y -y Don't perform any remote host key checking (caution)\n"
 					"-s    Request a subsystem (use by external sftp)\n"
 					"-o option     Set option in OpenSSH-like format ('-o help' to list options)\n"
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 					"-i <identityfile>   (multiple allowed, default %s)\n"
 #endif
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 					"-A    Enable agent auth forwarding\n"
 #endif
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 					"-L <[listenaddress:]listenport:remotehost:remoteport> Local port forwarding\n"
 					"-g    Allow remote hosts to connect to forwarded ports\n"
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 					"-R <[listenaddress:]listenport:remotehost:remoteport> Remote port forwarding\n"
 #endif
 					"-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n"
 					"-K <keepalive>  (0 is never, default %d)\n"
 					"-I <idle_timeout>  (0 is never, default %d)\n"
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 					"-B <endhost:endport> Netcat-alike forwarding\n"
 #endif				
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 					"-J <proxy_program> Use program pipe rather than TCP connection\n"
 #endif
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 					"-c <cipher list> Specify preferred ciphers ('-c help' to list options)\n"
 					"-m <MAC list> Specify preferred MACs for packet verification (or '-m help')\n"
 #endif
 					"-V    Version\n"
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 					"-v    verbose (compiled with DEBUG_TRACE)\n"
 #endif
 					,DROPBEAR_VERSION, cli_opts.progname,
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 					DROPBEAR_DEFAULT_CLI_AUTHKEY,
 #endif
 					DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT);
@@ -109,16 +109,16 @@
 	char ** next = 0;
 	enum {
 		OPT_EXTENDED_OPTIONS,
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 		OPT_AUTHKEY,
 #endif
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 		OPT_LOCALTCPFWD,
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 		OPT_REMOTETCPFWD,
 #endif
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 		OPT_NETCAT,
 #endif
 		/* a flag (no arg) if 'next' is NULL, a string-valued option otherwise */
@@ -145,31 +145,31 @@
 	cli_opts.always_accept_key = 0;
 	cli_opts.no_hostkey_check = 0;
 	cli_opts.is_subsystem = 0;
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	cli_opts.privkeys = list_new();
 #endif
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 	cli_opts.exit_on_fwd_failure = 0;
 #endif
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 	cli_opts.localfwds = list_new();
 	opts.listen_fwd_all = 0;
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 	cli_opts.remotefwds = list_new();
 #endif
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	cli_opts.agent_fwd = 0;
 	cli_opts.agent_fd = -1;
 	cli_opts.agent_keys_loaded = 0;
 #endif
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 	cli_opts.proxycmd = NULL;
 #endif
 #ifndef DISABLE_ZLIB
 	opts.compress_mode = DROPBEAR_COMPRESS_ON;
 #endif
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 	opts.cipher_list = NULL;
 	opts.mac_list = NULL;
 #endif
@@ -213,7 +213,7 @@
 				case 'p': /* remoteport */
 					next = &cli_opts.remoteport;
 					break;
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 				case 'i': /* an identityfile */
 					opt = OPT_AUTHKEY;
 					break;
@@ -236,7 +236,7 @@
 				case 'o':
 					opt = OPT_EXTENDED_OPTIONS;
 					break;
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 				case 'L':
 					opt = OPT_LOCALTCPFWD;
 					break;
@@ -244,17 +244,17 @@
 					opts.listen_fwd_all = 1;
 					break;
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 				case 'R':
 					opt = OPT_REMOTETCPFWD;
 					break;
 #endif
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 				case 'B':
 					opt = OPT_NETCAT;
 					break;
 #endif
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 				case 'J':
 					next = &cli_opts.proxycmd;
 					break;
@@ -278,12 +278,12 @@
 				case 'I':
 					next = &idle_timeout_arg;
 					break;
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 				case 'A':
 					cli_opts.agent_fwd = 1;
 					break;
 #endif
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 				case 'c':
 					next = &opts.cipher_list;
 					break;
@@ -291,22 +291,22 @@
 					next = &opts.mac_list;
 					break;
 #endif
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 				case 'v':
 					debug_trace = 1;
 					break;
 #endif
 				case 'F':
 				case 'e':
-#ifndef ENABLE_USER_ALGO_LIST
+#if !DROPBEAR_USER_ALGO_LIST
 				case 'c':
 				case 'm':
 #endif
 				case 'D':
-#ifndef ENABLE_CLI_REMOTETCPFWD
+#ifndef DROPBEAR_CLI_REMOTETCPFWD
 				case 'R':
 #endif
-#ifndef ENABLE_CLI_LOCALTCPFWD
+#ifndef DROPBEAR_CLI_LOCALTCPFWD
 				case 'L':
 #endif
 				case 'V':
@@ -338,28 +338,28 @@
 			add_extendedopt(&argv[i][j]);
 		}
 		else
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 		if (opt == OPT_AUTHKEY) {
 			TRACE(("opt authkey"))
 			loadidentityfile(&argv[i][j], 1);
 		}
 		else
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 		if (opt == OPT_REMOTETCPFWD) {
 			TRACE(("opt remotetcpfwd"))
 			addforward(&argv[i][j], cli_opts.remotefwds);
 		}
 		else
 #endif
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 		if (opt == OPT_LOCALTCPFWD) {
 			TRACE(("opt localtcpfwd"))
 			addforward(&argv[i][j], cli_opts.localfwds);
 		}
 		else
 #endif
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 		if (opt == OPT_NETCAT) {
 			TRACE(("opt netcat"))
 			add_netcat(&argv[i][j]);
@@ -405,11 +405,11 @@
 
 	/* And now a few sanity checks and setup */
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 	parse_ciphers_macs();
 #endif
 
-#ifdef ENABLE_CLI_PROXYCMD                                                                                                                                   
+#if DROPBEAR_CLI_PROXYCMD                                                                                                                                   
 	if (cli_opts.proxycmd) {
 		/* To match the common path of m_freeing it */
 		cli_opts.proxycmd = m_strdup(cli_opts.proxycmd);
@@ -457,13 +457,13 @@
 		opts.idle_timeout_secs = val;
 	}
 
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 	if (cli_opts.cmd && cli_opts.netcat_host) {
 		dropbear_log(LOG_INFO, "Ignoring command '%s' in netcat mode", cli_opts.cmd);
 	}
 #endif
 
-#if defined(DROPBEAR_DEFAULT_CLI_AUTHKEY) && defined(ENABLE_CLI_PUBKEY_AUTH)
+#if (DROPBEAR_CLI_PUBKEY_AUTH)
 	{
 		char *expand_path = expand_homedir_path(DROPBEAR_DEFAULT_CLI_AUTHKEY);
 		loadidentityfile(expand_path, 0);
@@ -474,14 +474,14 @@
 	/* The hostname gets set up last, since
 	 * in multi-hop mode it will require knowledge
 	 * of other flags such as -i */
-#ifdef ENABLE_CLI_MULTIHOP
+#if DROPBEAR_CLI_MULTIHOP
 	parse_multihop_hostname(host_arg, argv[0]);
 #else
 	parse_hostname(host_arg);
 #endif
 }
 
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 static void loadidentityfile(const char* filename, int warnfail) {
 	sign_key *key;
 	enum signkey_type keytype;
@@ -504,7 +504,7 @@
 }
 #endif
 
-#ifdef ENABLE_CLI_MULTIHOP
+#if DROPBEAR_CLI_MULTIHOP
 
 static char*
 multihop_passthrough_args() {
@@ -514,13 +514,13 @@
 	m_list_elem *iter;
 	/* Fill out -i, -y, -W options that make sense for all
 	 * the intermediate processes */
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
 	{
 		sign_key * key = (sign_key*)iter->item;
 		len += 3 + strlen(key->filename);
 	}
-#endif /* ENABLE_CLI_PUBKEY_AUTH */
+#endif /* DROPBEAR_CLI_PUBKEY_AUTH */
 
 	len += 30; /* space for -W <size>, terminator. */
 	ret = m_malloc(len);
@@ -543,7 +543,7 @@
 		total += written;
 	}
 
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
 	{
 		sign_key * key = (sign_key*)iter->item;
@@ -552,7 +552,7 @@
 		dropbear_assert((unsigned int)written < size);
 		total += written;
 	}
-#endif /* ENABLE_CLI_PUBKEY_AUTH */
+#endif /* DROPBEAR_CLI_PUBKEY_AUTH */
 
 	/* if args were passed, total will be not zero, and it will have a space at the end, so remove that */
 	if (total > 0) 
@@ -636,7 +636,7 @@
 	}
 	m_free(hostbuf);
 }
-#endif /* !ENABLE_CLI_MULTIHOP */
+#endif /* !DROPBEAR_CLI_MULTIHOP */
 
 /* Parses a [[email protected]]hostname[/port] argument. */
 static void parse_hostname(const char* orighostarg) {
@@ -675,7 +675,7 @@
 	}
 }
 
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 static void add_netcat(const char* origstr) {
 	char *portstr = NULL;
 	
@@ -728,7 +728,7 @@
 
 }
 
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 /* Turn a "[listenaddr:]listenport:remoteaddr:remoteport" string into into a forwarding
  * set, and add it to the forwarding list */
 static void addforward(const char* origstr, m_list *fwdlist) {
@@ -870,7 +870,7 @@
 
 	if (strcmp(origstr, "help") == 0) {
 		dropbear_log(LOG_INFO, "Available options:\n"
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 			"\tExitOnForwardFailure\n"
 #endif
 #ifndef DISABLE_SYSLOG
@@ -880,7 +880,7 @@
 		exit(EXIT_SUCCESS);
 	}
 
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 	if (match_extendedopt(&optstr, "ExitOnForwardFailure") == DROPBEAR_SUCCESS) {
 		cli_opts.exit_on_fwd_failure = parse_flag_value(optstr);
 		return;
--- a/cli-session.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-session.c	Thu May 18 23:45:10 2017 +0800
@@ -73,7 +73,7 @@
 	{SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_cli},
 	{SSH_MSG_CHANNEL_SUCCESS, ignore_recv_response},
 	{SSH_MSG_CHANNEL_FAILURE, ignore_recv_response},
-#ifdef  ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 	{SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */
 	{SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */
 #else
@@ -85,10 +85,10 @@
 };
 
 static const struct ChanType *cli_chantypes[] = {
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 	&cli_chan_tcpremote,
 #endif
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	&cli_chan_agent,
 #endif
 	NULL /* Null termination */
@@ -133,7 +133,7 @@
 
 }
 
-#ifdef USE_KEX_FIRST_FOLLOWS
+#if DROPBEAR_KEX_FIRST_FOLLOWS
 static void cli_send_kex_first_guess() {
 	send_msg_kexdh_init();
 }
@@ -165,7 +165,7 @@
 	cli_ses.lastprivkey = NULL;
 	cli_ses.lastauthtype = 0;
 
-#ifdef DROPBEAR_NONE_CIPHER
+#if DROPBEAR_NONE_CIPHER
 	cli_ses.cipher_none_after_auth = get_algo_usable(sshciphers, "none");
 	set_algo_usable(sshciphers, "none", 0);
 #else
@@ -182,7 +182,7 @@
 
 	ses.isserver = 0;
 
-#ifdef USE_KEX_FIRST_FOLLOWS
+#if DROPBEAR_KEX_FIRST_FOLLOWS
 	ses.send_kex_first_guess = cli_send_kex_first_guess;
 #endif
 
@@ -275,7 +275,7 @@
 			}
 #endif
 
-#ifdef DROPBEAR_NONE_CIPHER
+#if DROPBEAR_NONE_CIPHER
 			if (cli_ses.cipher_none_after_auth)
 			{
 				set_algo_usable(sshciphers, "none", 1);
@@ -299,7 +299,7 @@
 				}
 			}
 			
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 			if (cli_opts.netcat_host) {
 				cli_send_netcat_request();
 			} else 
@@ -308,10 +308,10 @@
 				cli_send_chansess_request();
 			}
 
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 			setup_localtcp();
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 			setup_remotetcp();
 #endif
 
--- a/cli-tcpfwd.c	Thu May 18 23:38:30 2017 +0800
+++ b/cli-tcpfwd.c	Thu May 18 23:45:10 2017 +0800
@@ -32,7 +32,7 @@
 #include "ssh.h"
 #include "netio.h"
 
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 static int newtcpforwarded(struct Channel * channel);
 
 const struct ChanType cli_chan_tcpremote = {
@@ -45,7 +45,7 @@
 };
 #endif
 
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 static int cli_localtcp(const char* listenaddr, 
 		unsigned int listenport, 
 		const char* remoteaddr,
@@ -60,7 +60,7 @@
 };
 #endif
 
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 static void fwd_failed(const char* format, ...) ATTRIB_PRINTF(1,2);
 static void fwd_failed(const char* format, ...)
 {
@@ -77,7 +77,7 @@
 }
 #endif
 
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 void setup_localtcp() {
 	m_list_elem *iter;
 	int ret;
@@ -144,9 +144,9 @@
 	TRACE(("leave cli_localtcp: %d", ret))
 	return ret;
 }
-#endif /* ENABLE_CLI_LOCALTCPFWD */
+#endif /* DROPBEAR_CLI_LOCALTCPFWD */
 
-#ifdef  ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 static void send_msg_global_request_remotetcp(const char *addr, int port) {
 
 	TRACE(("enter send_msg_global_request_remotetcp"))
@@ -234,7 +234,7 @@
 	char *origaddr = NULL;
 	unsigned int origport;
 	m_list_elem * iter = NULL;
-	struct TCPFwdEntry *fwd;
+	struct TCPFwdEntry *fwd = NULL;
 	char portstring[NI_MAXSERV];
 	int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED;
 
@@ -265,7 +265,7 @@
 	}
 
 
-	if (iter == NULL) {
+	if (iter == NULL || fwd == NULL) {
 		/* We didn't request forwarding on that port */
 		cleantext(origaddr);
 		dropbear_log(LOG_INFO, "Server sent unrequested forward from \"%s:%d\"", 
@@ -285,4 +285,4 @@
 	TRACE(("leave newtcpdirect: err %d", err))
 	return err;
 }
-#endif /* ENABLE_CLI_REMOTETCPFWD */
+#endif /* DROPBEAR_CLI_REMOTETCPFWD */
--- a/common-algo.c	Thu May 18 23:38:30 2017 +0800
+++ b/common-algo.c	Thu May 18 23:45:10 2017 +0800
@@ -53,27 +53,27 @@
 
 /* Remember to add new ciphers/hashes to regciphers/reghashes too */
 
-#ifdef DROPBEAR_AES256
+#if DROPBEAR_AES256
 static const struct dropbear_cipher dropbear_aes256 = 
 	{&aes_desc, 32, 16};
 #endif
-#ifdef DROPBEAR_AES128
+#if DROPBEAR_AES128
 static const struct dropbear_cipher dropbear_aes128 = 
 	{&aes_desc, 16, 16};
 #endif
-#ifdef DROPBEAR_BLOWFISH
+#if DROPBEAR_BLOWFISH
 static const struct dropbear_cipher dropbear_blowfish = 
 	{&blowfish_desc, 16, 8};
 #endif
-#ifdef DROPBEAR_TWOFISH256
+#if DROPBEAR_TWOFISH256
 static const struct dropbear_cipher dropbear_twofish256 = 
 	{&twofish_desc, 32, 16};
 #endif
-#ifdef DROPBEAR_TWOFISH128
+#if DROPBEAR_TWOFISH128
 static const struct dropbear_cipher dropbear_twofish128 = 
 	{&twofish_desc, 16, 16};
 #endif
-#ifdef DROPBEAR_3DES
+#if DROPBEAR_3DES
 static const struct dropbear_cipher dropbear_3des = 
 	{&des3_desc, 24, 8};
 #endif
@@ -84,7 +84,7 @@
 
 /* A few void* s are required to silence warnings
  * about the symmetric_CBC vs symmetric_CTR cipher_state pointer */
-#ifdef DROPBEAR_ENABLE_CBC_MODE
+#if DROPBEAR_ENABLE_CBC_MODE
 const struct dropbear_cipher_mode dropbear_mode_cbc =
 	{(void*)cbc_start, (void*)cbc_encrypt, (void*)cbc_decrypt};
 #endif /* DROPBEAR_ENABLE_CBC_MODE */
@@ -92,7 +92,7 @@
 const struct dropbear_cipher_mode dropbear_mode_none =
 	{void_start, void_cipher, void_cipher};
 
-#ifdef DROPBEAR_ENABLE_CTR_MODE
+#if DROPBEAR_ENABLE_CTR_MODE
 /* a wrapper to make ctr_start and cbc_start look the same */
 static int dropbear_big_endian_ctr_start(int cipher, 
 		const unsigned char *IV, 
@@ -107,23 +107,23 @@
 /* Mapping of ssh hashes to libtomcrypt hashes, including keysize etc.
    {&hash_desc, keysize, hashsize} */
 
-#ifdef DROPBEAR_SHA1_HMAC
+#if DROPBEAR_SHA1_HMAC
 static const struct dropbear_hash dropbear_sha1 = 
 	{&sha1_desc, 20, 20};
 #endif
-#ifdef DROPBEAR_SHA1_96_HMAC
+#if DROPBEAR_SHA1_96_HMAC
 static const struct dropbear_hash dropbear_sha1_96 = 
 	{&sha1_desc, 20, 12};
 #endif
-#ifdef DROPBEAR_SHA2_256_HMAC
+#if DROPBEAR_SHA2_256_HMAC
 static const struct dropbear_hash dropbear_sha2_256 = 
 	{&sha256_desc, 32, 32};
 #endif
-#ifdef DROPBEAR_SHA2_512_HMAC
+#if DROPBEAR_SHA2_512_HMAC
 static const struct dropbear_hash dropbear_sha2_512 =
 	{&sha512_desc, 64, 64};
 #endif
-#ifdef DROPBEAR_MD5_HMAC
+#if DROPBEAR_MD5_HMAC
 static const struct dropbear_hash dropbear_md5 = 
 	{&md5_desc, 16, 16};
 #endif
@@ -137,73 +137,70 @@
  * that is also supported by the server will get used. */
 
 algo_type sshciphers[] = {
-#ifdef DROPBEAR_ENABLE_CTR_MODE
-#ifdef DROPBEAR_AES128
+#if DROPBEAR_ENABLE_CTR_MODE
+#if DROPBEAR_AES128
 	{"aes128-ctr", 0, &dropbear_aes128, 1, &dropbear_mode_ctr},
 #endif
-#ifdef DROPBEAR_AES256
+#if DROPBEAR_AES256
 	{"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
 #endif
-#ifdef DROPBEAR_TWOFISH_CTR
+#if DROPBEAR_TWOFISH_CTR
 /* twofish ctr is conditional as it hasn't been tested for interoperability, see options.h */
-#ifdef DROPBEAR_TWOFISH256
+#if DROPBEAR_TWOFISH256
 	{"twofish256-ctr", 0, &dropbear_twofish256, 1, &dropbear_mode_ctr},
 #endif
-#ifdef DROPBEAR_TWOFISH128
+#if DROPBEAR_TWOFISH128
 	{"twofish128-ctr", 0, &dropbear_twofish128, 1, &dropbear_mode_ctr},
 #endif
 #endif /* DROPBEAR_TWOFISH_CTR */
 #endif /* DROPBEAR_ENABLE_CTR_MODE */
 
-#ifdef DROPBEAR_ENABLE_CBC_MODE
-#ifdef DROPBEAR_AES128
+#if DROPBEAR_ENABLE_CBC_MODE
+#if DROPBEAR_AES128
 	{"aes128-cbc", 0, &dropbear_aes128, 1, &dropbear_mode_cbc},
 #endif
-#ifdef DROPBEAR_AES256
+#if DROPBEAR_AES256
 	{"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
 #endif
-#ifdef DROPBEAR_TWOFISH256
+#if DROPBEAR_TWOFISH256
 	{"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
 	{"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
 #endif
-#ifdef DROPBEAR_TWOFISH128
+#if DROPBEAR_TWOFISH128
 	{"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
 #endif
-#ifdef DROPBEAR_3DES
+#if DROPBEAR_3DES
 	{"3des-ctr", 0, &dropbear_3des, 1, &dropbear_mode_ctr},
 #endif
-#ifdef DROPBEAR_3DES
+#if DROPBEAR_3DES
 	{"3des-cbc", 0, &dropbear_3des, 1, &dropbear_mode_cbc},
 #endif
-#ifdef DROPBEAR_BLOWFISH
+#if DROPBEAR_BLOWFISH
 	{"blowfish-cbc", 0, &dropbear_blowfish, 1, &dropbear_mode_cbc},
 #endif
 #endif /* DROPBEAR_ENABLE_CBC_MODE */
-#ifdef DROPBEAR_NONE_CIPHER
+#if DROPBEAR_NONE_CIPHER
 	{"none", 0, (void*)&dropbear_nocipher, 1, &dropbear_mode_none},
 #endif
 	{NULL, 0, NULL, 0, NULL}
 };
 
 algo_type sshhashes[] = {
-#ifdef DROPBEAR_SHA1_96_HMAC
+#if DROPBEAR_SHA1_96_HMAC
 	{"hmac-sha1-96", 0, &dropbear_sha1_96, 1, NULL},
 #endif
-#ifdef DROPBEAR_SHA1_HMAC
+#if DROPBEAR_SHA1_HMAC
 	{"hmac-sha1", 0, &dropbear_sha1, 1, NULL},
 #endif
-#ifdef DROPBEAR_SHA2_256_HMAC
+#if DROPBEAR_SHA2_256_HMAC
 	{"hmac-sha2-256", 0, &dropbear_sha2_256, 1, NULL},
 #endif
-#ifdef DROPBEAR_SHA2_512_HMAC
+#if DROPBEAR_SHA2_512_HMAC
 	{"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
 #endif
-#ifdef DROPBEAR_MD5_HMAC
+#if DROPBEAR_MD5_HMAC
 	{"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
 #endif
-#ifdef DROPBEAR_NONE_INTEGRITY
-	{"none", 0, (void*)&dropbear_nohash, 1, NULL},
-#endif
 	{NULL, 0, NULL, 0, NULL}
 };
 
@@ -228,21 +225,21 @@
 };
 
 algo_type sshhostkey[] = {
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 	{"ecdsa-sha2-nistp256", DROPBEAR_SIGNKEY_ECDSA_NISTP256, NULL, 1, NULL},
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	{"ecdsa-sha2-nistp384", DROPBEAR_SIGNKEY_ECDSA_NISTP384, NULL, 1, NULL},
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	{"ecdsa-sha2-nistp521", DROPBEAR_SIGNKEY_ECDSA_NISTP521, NULL, 1, NULL},
 #endif
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	{"ssh-rsa", DROPBEAR_SIGNKEY_RSA, NULL, 1, NULL},
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	{"ssh-dss", DROPBEAR_SIGNKEY_DSS, NULL, 1, NULL},
 #endif
 	{NULL, 0, NULL, 0, NULL}
@@ -251,63 +248,63 @@
 #if DROPBEAR_DH_GROUP1
 static const struct dropbear_kex kex_dh_group1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_1, DH_P_1_LEN, NULL, &sha1_desc };
 #endif
-#if DROPBEAR_DH_GROUP14
+#if DROPBEAR_DH_GROUP14_SHA1
 static const struct dropbear_kex kex_dh_group14_sha1 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha1_desc };
-#if DROPBEAR_DH_GROUP14_256
+#endif
+#if DROPBEAR_DH_GROUP14_SHA256
 static const struct dropbear_kex kex_dh_group14_sha256 = {DROPBEAR_KEX_NORMAL_DH, dh_p_14, DH_P_14_LEN, NULL, &sha256_desc };
 #endif
-#endif
 #if DROPBEAR_DH_GROUP16
 static const struct dropbear_kex kex_dh_group16_sha512 = {DROPBEAR_KEX_NORMAL_DH, dh_p_16, DH_P_16_LEN, NULL, &sha512_desc };
 #endif
 
 /* These can't be const since dropbear_ecc_fill_dp() fills out
  ecc_curve at runtime */
-#ifdef DROPBEAR_ECDH
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDH
+#if DROPBEAR_ECC_256
 static const struct dropbear_kex kex_ecdh_nistp256 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp256, &sha256_desc };
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 static const struct dropbear_kex kex_ecdh_nistp384 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp384, &sha384_desc };
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 static const struct dropbear_kex kex_ecdh_nistp521 = {DROPBEAR_KEX_ECDH, NULL, 0, &ecc_curve_nistp521, &sha512_desc };
 #endif
 #endif /* DROPBEAR_ECDH */
 
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 /* Referred to directly */
 static const struct dropbear_kex kex_curve25519 = {DROPBEAR_KEX_CURVE25519, NULL, 0, NULL, &sha256_desc };
 #endif
 
 algo_type sshkex[] = {
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 	{"[email protected]", 0, &kex_curve25519, 1, NULL},
 #endif
-#ifdef DROPBEAR_ECDH
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECDH
+#if DROPBEAR_ECC_521
 	{"ecdh-sha2-nistp521", 0, &kex_ecdh_nistp521, 1, NULL},
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	{"ecdh-sha2-nistp384", 0, &kex_ecdh_nistp384, 1, NULL},
 #endif
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 	{"ecdh-sha2-nistp256", 0, &kex_ecdh_nistp256, 1, NULL},
 #endif
 #endif
-#if DROPBEAR_DH_GROUP14
-#if DROPBEAR_DH_GROUP14_256
+#if DROPBEAR_DH_GROUP14_SHA1
+	{"diffie-hellman-group14-sha1", 0, &kex_dh_group14_sha1, 1, NULL},
+#endif
+#if DROPBEAR_DH_GROUP14_SHA256
 	{"diffie-hellman-group14-sha256", 0, &kex_dh_group14_sha256, 1, NULL},
 #endif
-	{"diffie-hellman-group14-sha1", 0, &kex_dh_group14_sha1, 1, NULL},
-#endif
 #if DROPBEAR_DH_GROUP1
 	{"diffie-hellman-group1-sha1", 0, &kex_dh_group1, 1, NULL},
 #endif
 #if DROPBEAR_DH_GROUP16
 	{"diffie-hellman-group16-sha512", 0, &kex_dh_group16_sha512, 1, NULL},
 #endif
-#ifdef USE_KEXGUESS2
+#if DROPBEAR_KEXGUESS2
 	{KEXGUESS2_ALGO_NAME, KEXGUESS2_ALGO_ID, NULL, 1, NULL},
 #endif
 	{NULL, 0, NULL, 0, NULL}
@@ -349,6 +346,7 @@
 		}
 	}
 	buf_putstring(buf, (const char*)algolist->data, algolist->len);
+	TRACE(("algolist add '%*s'", algolist->len, algolist->data))
 	buf_free(algolist);
 }
 
@@ -468,7 +466,7 @@
 	return ret;
 }
 
-#ifdef DROPBEAR_NONE_CIPHER
+#if DROPBEAR_NONE_CIPHER
 
 void
 set_algo_usable(algo_type algos[], const char * algo_name, int usable)
@@ -500,7 +498,7 @@
 
 #endif /* DROPBEAR_NONE_CIPHER */
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 
 char *
 algolist_string(algo_type algos[])
@@ -577,4 +575,4 @@
 	memcpy(algos, new_algos, sizeof(*new_algos) * (n+1));
 	return n;
 }
-#endif /* ENABLE_USER_ALGO_LIST */
+#endif /* DROPBEAR_USER_ALGO_LIST */
--- a/common-channel.c	Thu May 18 23:38:30 2017 +0800
+++ b/common-channel.c	Thu May 18 23:45:10 2017 +0800
@@ -32,7 +32,6 @@
 #include "circbuffer.h"
 #include "dbutil.h"
 #include "channel.h"
-#include "ssh.h"
 #include "listener.h"
 #include "runopts.h"
 #include "netio.h"
@@ -78,7 +77,7 @@
 
 	ses.chantypes = chantypes;
 
-#ifdef USING_LISTENERS
+#if DROPBEAR_LISTENERS
 	listeners_initialise();
 #endif
 
@@ -255,7 +254,7 @@
 		}
 	}
 
-#ifdef USING_LISTENERS
+#if DROPBEAR_LISTENERS
 	handle_listeners(readfds);
 #endif
 }
@@ -595,7 +594,7 @@
 
 	} /* foreach channel */
 
-#ifdef USING_LISTENERS
+#if DROPBEAR_LISTENERS
 	set_listener_fds(readfds);
 #endif
 
@@ -1114,7 +1113,7 @@
 }
 
 
-#if defined(USING_LISTENERS) || defined(DROPBEAR_CLIENT)
+#if (DROPBEAR_LISTENERS) || (DROPBEAR_CLIENT)
 /* Create a new channel, and start the open request. This is intended
  * for X11, agent, tcp forwarding, and should be filled with channel-specific
  * options, with the calling function calling encrypt_packet() after
@@ -1210,7 +1209,7 @@
 
 	remove_channel(channel);
 }
-#endif /* USING_LISTENERS */
+#endif /* DROPBEAR_LISTENERS */
 
 void send_msg_request_success() {
 	CHECKCLEARTOWRITE();
--- a/common-kex.c	Thu May 18 23:38:30 2017 +0800
+++ b/common-kex.c	Thu May 18 23:45:10 2017 +0800
@@ -640,7 +640,7 @@
 	finish_kexhashbuf();
 }
 
-#ifdef DROPBEAR_ECDH
+#if DROPBEAR_ECDH
 struct kex_ecdh_param *gen_kexecdh_param() {
 	struct kex_ecdh_param *param = m_malloc(sizeof(*param));
 	if (ecc_make_key_ex(NULL, dropbear_ltc_prng, 
@@ -692,7 +692,7 @@
 }
 #endif /* DROPBEAR_ECDH */
 
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 struct kex_curve25519_param *gen_kexcurve25519_param () {
 	/* Per http://cr.yp.to/ecdh.html */
 	struct kex_curve25519_param *param = m_malloc(sizeof(*param));
@@ -774,7 +774,7 @@
 	hash_desc->done(&hs, buf_getwriteptr(ses.hash, hash_desc->hashsize));
 	buf_setlen(ses.hash, hash_desc->hashsize);
 
-#if defined(DEBUG_KEXHASH) && defined(DEBUG_TRACE)
+#if (DEBUG_KEXHASH) && (DEBUG_TRACE)
 	if (!debug_trace) {
 		printhex("kexhashbuf", ses.kexhashbuf->data, ses.kexhashbuf->len);
 		printhex("kexhash", ses.hash->data, ses.hash->len);
@@ -814,7 +814,7 @@
 	int allgood = 1; /* we AND this with each goodguess and see if its still
 						true after */
 
-#ifdef USE_KEXGUESS2
+#if DROPBEAR_KEXGUESS2
 	enum kexguess2_used kexguess2 = KEXGUESS2_LOOK;
 #else
 	enum kexguess2_used kexguess2 = KEXGUESS2_NO;
--- a/common-runopts.c	Thu May 18 23:38:30 2017 +0800
+++ b/common-runopts.c	Thu May 18 23:45:10 2017 +0800
@@ -62,7 +62,7 @@
 	return ret;
 }
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 void
 parse_ciphers_macs()
 {
--- a/common-session.c	Thu May 18 23:38:30 2017 +0800
+++ b/common-session.c	Thu May 18 23:45:10 2017 +0800
@@ -54,7 +54,7 @@
 void common_session_init(int sock_in, int sock_out) {
 	time_t now;
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 	debug_start_net();
 #endif
 
@@ -295,7 +295,7 @@
 	}
 
 	/* After these are freed most functions will fail */
-#ifdef DROPBEAR_CLEANUP
+#if DROPBEAR_CLEANUP
 	/* listeners call cleanup functions, this should occur before
 	other session state is freed. */
 	remove_all_listeners();
--- a/compat.c	Thu May 18 23:38:30 2017 +0800
+++ b/compat.c	Thu May 18 23:45:10 2017 +0800
@@ -114,8 +114,8 @@
 #endif /* HAVE_STRLCPY */
 
 #ifndef HAVE_STRLCAT
-/* taken from openbsd-compat for OpenSSH 3.6.1p1 */
-/* "$OpenBSD: strlcat.c,v 1.8 2001/05/13 15:40:15 deraadt Exp $"
+/* taken from openbsd-compat for OpenSSH 7.2p2 */
+/* "$OpenBSD: strlcat.c,v 1.13 2005/08/08 08:05:37 espie Exp $"
  *
  * Appends src to string dst of size siz (unlike strncat, siz is the
  * full size of dst, not space left).  At most siz-1 characters
@@ -123,15 +123,12 @@
  * Returns strlen(src) + MIN(siz, strlen(initial dst)).
  * If retval >= siz, truncation occurred.
  */
-	size_t
-strlcat(dst, src, siz)
-	char *dst;
-	const char *src;
-	size_t siz;
+size_t
+strlcat(char *dst, const char *src, size_t siz)
 {
-	register char *d = dst;
-	register const char *s = src;
-	register size_t n = siz;
+	char *d = dst;
+	const char *s = src;
+	size_t n = siz;
 	size_t dlen;
 
 	/* Find the end of dst and adjust bytes left but don't go past end */
--- a/crypto_desc.c	Thu May 18 23:38:30 2017 +0800
+++ b/crypto_desc.c	Thu May 18 23:45:10 2017 +0800
@@ -4,7 +4,7 @@
 #include "ltc_prng.h"
 #include "ecc.h"
 
-#ifdef DROPBEAR_LTC_PRNG
+#if DROPBEAR_LTC_PRNG
 	int dropbear_ltc_prng = -1;
 #endif
 
@@ -14,16 +14,16 @@
 void crypto_init() {
 
 	const struct ltc_cipher_descriptor *regciphers[] = {
-#ifdef DROPBEAR_AES
+#if DROPBEAR_AES
 		&aes_desc,
 #endif
-#ifdef DROPBEAR_BLOWFISH
+#if DROPBEAR_BLOWFISH
 		&blowfish_desc,
 #endif
-#ifdef DROPBEAR_TWOFISH
+#if DROPBEAR_TWOFISH
 		&twofish_desc,
 #endif
-#ifdef DROPBEAR_3DES
+#if DROPBEAR_3DES
 		&des3_desc,
 #endif
 		NULL
@@ -32,16 +32,16 @@
 	const struct ltc_hash_descriptor *reghashes[] = {
 		/* we need sha1 for hostkey stuff regardless */
 		&sha1_desc,
-#ifdef DROPBEAR_MD5_HMAC
+#if DROPBEAR_MD5_HMAC
 		&md5_desc,
 #endif
-#ifdef DROPBEAR_SHA256
+#if DROPBEAR_SHA256
 		&sha256_desc,
 #endif
-#ifdef DROPBEAR_SHA384
+#if DROPBEAR_SHA384
 		&sha384_desc,
 #endif
-#ifdef DROPBEAR_SHA512
+#if DROPBEAR_SHA512
 		&sha512_desc,
 #endif
 		NULL
@@ -60,14 +60,14 @@
 		}
 	}
 
-#ifdef DROPBEAR_LTC_PRNG
+#if DROPBEAR_LTC_PRNG
 	dropbear_ltc_prng = register_prng(&dropbear_prng_desc);
 	if (dropbear_ltc_prng == -1) {
 		dropbear_exit("Error registering crypto");
 	}
 #endif
 
-#ifdef DROPBEAR_ECC
+#if DROPBEAR_ECC
 	ltc_mp = ltm_desc;
 	dropbear_ecc_fill_dp();
 #endif
--- a/dbrandom.c	Thu May 18 23:38:30 2017 +0800
+++ b/dbrandom.c	Thu May 18 23:45:10 2017 +0800
@@ -61,7 +61,7 @@
 	unsigned int readcount;
 	int ret = DROPBEAR_FAILURE;
 
-#ifdef DROPBEAR_PRNGD_SOCKET
+#if DROPBEAR_PRNGD_SOCKET
 	if (prngd)
 	{
 		readfd = connect_unix(filename);
@@ -109,7 +109,7 @@
 			wantread = MIN(sizeof(readbuf), len-readcount);
 		}
 
-#ifdef DROPBEAR_PRNGD_SOCKET
+#if DROPBEAR_PRNGD_SOCKET
 		if (prngd)
 		{
 			char egdcmd[2];
@@ -216,7 +216,7 @@
 	/* existing state */
 	sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
 
-#ifdef DROPBEAR_PRNGD_SOCKET
+#if DROPBEAR_PRNGD_SOCKET
 	if (process_file(&hs, DROPBEAR_PRNGD_SOCKET, INIT_SEED_SIZE, 1) 
 			!= DROPBEAR_SUCCESS) {
 		dropbear_exit("Failure reading random device %s", 
--- a/dbutil.c	Thu May 18 23:38:30 2017 +0800
+++ b/dbutil.c	Thu May 18 23:45:10 2017 +0800
@@ -79,7 +79,7 @@
 void (*_dropbear_log)(int priority, const char* format, va_list param)
 						= generic_dropbear_log;
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 int debug_trace = 0;
 #endif
 
@@ -149,7 +149,7 @@
 }
 
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 
 static double debug_start_time = -1;
 
@@ -262,7 +262,7 @@
 		return DROPBEAR_FAILURE;
 	}
 
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	pid = vfork();
 #else
 	pid = fork();
@@ -371,7 +371,7 @@
 	execv(usershell, argv);
 }
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 void printhex(const char * label, const unsigned char * buf, int len) {
 
 	int i;
@@ -465,7 +465,7 @@
  * authkeys file.
  * Will return DROPBEAR_SUCCESS if data is read, or DROPBEAR_FAILURE on EOF.*/
 /* Only used for ~/.ssh/known_hosts and ~/.ssh/authorized_keys */
-#if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
+#if DROPBEAR_CLIENT || DROPBEAR_SVR_PUBKEY_AUTH
 int buf_getline(buffer * line, FILE * authfile) {
 
 	int c = EOF;
@@ -681,4 +681,21 @@
 	return time(NULL);
 }
 
+void fsync_parent_dir(const char* fn) {
+#ifdef HAVE_LIBGEN_H
+	char *fn_dir = m_strdup(fn);
+	char *dir = dirname(fn_dir);
+	int dirfd = open(dir, O_RDONLY);
 
+	if (dirfd != -1) {
+		if (fsync(dirfd) != 0) {
+			TRACE(("fsync of directory %s failed: %s", dir, strerror(errno)))
+		}
+		m_close(dirfd);
+	} else {
+		TRACE(("error opening directory %s for fsync: %s", dir, strerror(errno)))
+	}
+
+	free(fn_dir);
+#endif
+}
--- a/dbutil.h	Thu May 18 23:38:30 2017 +0800
+++ b/dbutil.h	Thu May 18 23:45:10 2017 +0800
@@ -45,7 +45,7 @@
 
 void fail_assert(const char* expr, const char* file, int line) ATTRIB_NORETURN;
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 void dropbear_trace(const char* format, ...) ATTRIB_PRINTF(1,2);
 void dropbear_trace2(const char* format, ...) ATTRIB_PRINTF(1,2);
 void printhex(const char * label, const unsigned char * buf, int len);
@@ -89,4 +89,6 @@
 
 char * expand_homedir_path(const char *inpath);
 
+void fsync_parent_dir(const char* fn);
+
 #endif /* DROPBEAR_DBUTIL_H_ */
--- a/debian/changelog	Thu May 18 23:38:30 2017 +0800
+++ b/debian/changelog	Thu May 18 23:45:10 2017 +0800
@@ -1,3 +1,9 @@
+dropbear (2017.75-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <[email protected]>  Thu, 18 May 2017 22:51:57 +0800
+
 dropbear (2016.74-0.1) unstable; urgency=low
 
   * New upstream release.
--- a/debug.h	Thu May 18 23:38:30 2017 +0800
+++ b/debug.h	Thu May 18 23:45:10 2017 +0800
@@ -39,7 +39,9 @@
  * Caution: Don't use this in an unfriendly environment (ie unfirewalled),
  * since the printing may not sanitise strings etc. This will add a reasonable
  * amount to your executable size. */
-/*#define DEBUG_TRACE*/
+#ifndef DEBUG_TRACE
+#define DEBUG_TRACE 0
+#endif
 
 /* All functions writing to the cleartext payload buffer call
  * CHECKCLEARTOWRITE() before writing. This is only really useful if you're
@@ -61,7 +63,7 @@
 /*#define DEBUG_RSA*/
 
 /* you don't need to touch this block */
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 #define TRACE(X) dropbear_trace X;
 #define TRACE2(X) dropbear_trace2 X;
 #else /*DEBUG_TRACE*/
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/default_options.h	Thu May 18 23:45:10 2017 +0800
@@ -0,0 +1,458 @@
+#ifndef DROPBEAR_DEFAULT_OPTIONS_H_
+#define DROPBEAR_DEFAULT_OPTIONS_H_
+/*
+                     > > > Read This < < <
+
+default_options.h.in (this file) documents compile-time options, and provides 
+default values.
+
+Local customisation should be added to localoptions.h which is
+used if it exists. Options defined there will override any options in this
+file (#ifndef guards added by ifndef_wrapper.sh).
+
+Options can also be defined with -DDROPBEAR_XXX Makefile CFLAGS
+
+IMPORTANT: Many options will require "make clean" after changes */
+
+#ifndef DROPBEAR_DEFPORT
+#define DROPBEAR_DEFPORT "22"
+#endif
+
+/* Listen on all interfaces */
+#ifndef DROPBEAR_DEFADDRESS
+#define DROPBEAR_DEFADDRESS ""
+#endif
+
+/* Default hostkey paths - these can be specified on the command line */
+#ifndef DSS_PRIV_FILENAME
+#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
+#endif
+#ifndef RSA_PRIV_FILENAME
+#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
+#endif
+#ifndef ECDSA_PRIV_FILENAME
+#define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
+#endif
+
+/* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
+ * on chosen ports and keeps accepting connections. This is the default.
+ *
+ * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
+ * similar), where it will use stdin/stdout for connections, and each process
+ * lasts for a single connection. Dropbear should be invoked with the -i flag
+ * for inetd, and can only accept IPv4 connections.
+ *
+ * Both of these flags can be defined at once, don't compile without at least
+ * one of them. */
+#ifndef NON_INETD_MODE
+#define NON_INETD_MODE 1
+#endif
+#ifndef INETD_MODE
+#define INETD_MODE 1
+#endif
+
+/* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
+ * perhaps 20% slower for pubkey operations (it is probably worth experimenting
+ * if you want to use this) */
+/*#define NO_FAST_EXPTMOD*/
+
+/* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
+several kB in binary size however will make the symmetrical ciphers and hashes
+slower, perhaps by 50%. Recommended for small systems that aren't doing
+much traffic. */
+#ifndef DROPBEAR_SMALL_CODE
+#define DROPBEAR_SMALL_CODE 1
+#endif
+
+/* Enable X11 Forwarding - server only */
+#ifndef DROPBEAR_X11FWD
+#define DROPBEAR_X11FWD 1
+#endif
+
+/* Enable TCP Fowarding */
+/* 'Local' is "-L" style (client listening port forwarded via server)
+ * 'Remote' is "-R" style (server listening port forwarded via client) */
+
+#ifndef DROPBEAR_CLI_LOCALTCPFWD
+#define DROPBEAR_CLI_LOCALTCPFWD 1
+#endif
+#ifndef DROPBEAR_CLI_REMOTETCPFWD
+#define DROPBEAR_CLI_REMOTETCPFWD 1
+#endif
+
+#ifndef DROPBEAR_SVR_LOCALTCPFWD
+#define DROPBEAR_SVR_LOCALTCPFWD 1
+#endif
+#ifndef DROPBEAR_SVR_REMOTETCPFWD
+#define DROPBEAR_SVR_REMOTETCPFWD 1
+#endif
+
+/* Enable Authentication Agent Forwarding */
+#ifndef DROPBEAR_SVR_AGENTFWD
+#define DROPBEAR_SVR_AGENTFWD 1
+#endif
+#ifndef DROPBEAR_CLI_AGENTFWD
+#define DROPBEAR_CLI_AGENTFWD 1
+#endif
+
+
+/* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to
+ * allow multihop dbclient connections */
+
+/* Allow using -J <proxycommand> to run the connection through a 
+   pipe to a program, rather the normal TCP connection */
+#ifndef DROPBEAR_CLI_PROXYCMD
+#define DROPBEAR_CLI_PROXYCMD 1
+#endif
+
+/* Enable "Netcat mode" option. This will forward standard input/output
+ * to a remote TCP-forwarded connection */
+#ifndef DROPBEAR_CLI_NETCAT
+#define DROPBEAR_CLI_NETCAT 1
+#endif
+
+/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
+#ifndef ENABLE_USER_ALGO_LIST
+#define ENABLE_USER_ALGO_LIST 1
+#endif
+
+/* Encryption - at least one required.
+ * Protocol RFC requires 3DES and recommends AES128 for interoperability.
+ * Including multiple keysize variants the same cipher 
+ * (eg AES256 as well as AES128) will result in a minimal size increase.*/
+#ifndef DROPBEAR_AES128
+#define DROPBEAR_AES128 1
+#endif
+#ifndef DROPBEAR_3DES
+#define DROPBEAR_3DES 1
+#endif
+#ifndef DROPBEAR_AES256
+#define DROPBEAR_AES256 1
+#endif
+/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
+/*#define DROPBEAR_BLOWFISH*/
+#ifndef DROPBEAR_TWOFISH256
+#define DROPBEAR_TWOFISH256 1
+#endif
+#ifndef DROPBEAR_TWOFISH128
+#define DROPBEAR_TWOFISH128 1
+#endif
+
+/* Enable CBC mode for ciphers. This has security issues though
+ * is the most compatible with older SSH implementations */
+#ifndef DROPBEAR_ENABLE_CBC_MODE
+#define DROPBEAR_ENABLE_CBC_MODE 1
+#endif
+
+/* Enable "Counter Mode" for ciphers. This is more secure than normal
+ * CBC mode against certain attacks. It is recommended for security
+ * and forwards compatibility */
+#ifndef DROPBEAR_ENABLE_CTR_MODE
+#define DROPBEAR_ENABLE_CTR_MODE 1
+#endif
+
+/* Twofish counter mode is disabled by default because it 
+has not been tested for interoperability with other SSH implementations.
+If you test it please contact the Dropbear author */
+#ifndef DROPBEAR_TWOFISH_CTR
+#define DROPBEAR_TWOFISH_CTR 0
+#endif
+
+/* Message integrity. sha2-256 is recommended as a default, 
+   sha1 for compatibility */
+#ifndef DROPBEAR_SHA1_HMAC
+#define DROPBEAR_SHA1_HMAC 1
+#endif
+#ifndef DROPBEAR_SHA1_96_HMAC
+#define DROPBEAR_SHA1_96_HMAC 1
+#endif
+#ifndef DROPBEAR_SHA2_256_HMAC
+#define DROPBEAR_SHA2_256_HMAC 1
+#endif
+/* Default is to include it is sha512 is being compiled in for ECDSA */
+#ifndef DROPBEAR_SHA2_512_HMAC
+#define DROPBEAR_SHA2_512_HMAC (DROPBEAR_ECDSA)
+#endif
+
+/* XXX needed for fingerprints */
+#ifndef DROPBEAR_MD5_HMAC
+#define DROPBEAR_MD5_HMAC 0
+#endif
+
+/* Hostkey/public key algorithms - at least one required, these are used
+ * for hostkey as well as for verifying signatures with pubkey auth.
+ * Removing either of these won't save very much space.
+ * RSA is recommended
+ * DSS may be necessary to connect to some systems though
+   is not recommended for new keys */
+#ifndef DROPBEAR_RSA
+#define DROPBEAR_RSA 1
+#endif
+#ifndef DROPBEAR_DSS
+#define DROPBEAR_DSS 1
+#endif
+/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
+ * code (either ECDSA or ECDH) increases binary size - around 30kB
+ * on x86-64 */
+#ifndef DROPBEAR_ECDSA
+#define DROPBEAR_ECDSA 1
+#endif
+
+/* Add runtime flag "-R" to generate hostkeys as-needed when the first 
+   connection using that key type occurs.
+   This avoids the need to otherwise run "dropbearkey" and avoids some problems
+   with badly seeded /dev/urandom when systems first boot. */
+#ifndef DROPBEAR_DELAY_HOSTKEY
+#define DROPBEAR_DELAY_HOSTKEY 1
+#endif
+
+/* Enable Curve25519 for key exchange. This is another elliptic
+ * curve method with good security properties. Increases binary size
+ * by ~8kB on x86-64 */
+#ifndef DROPBEAR_CURVE25519
+#define DROPBEAR_CURVE25519 1
+#endif
+
+/* Enable elliptic curve Diffie Hellman key exchange, see note about
+ * ECDSA above */
+#ifndef DROPBEAR_ECDH
+#define DROPBEAR_ECDH 1
+#endif
+
+/* Key exchange algorithm.
+ * group14_sha1 - 2048 bit, sha1
+ * group14_sha256 - 2048 bit, sha2-256
+ * group16 - 4096 bit, sha2-512
+ * group1 - 1024 bit, sha1
+ *
+ * group14 is supported by most implementations.
+ * group16 provides a greater strength level but is slower and increases binary size
+ * group1 is too small for security though is necessary if you need 
+     compatibility with some implementations such as Dropbear versions < 0.53
+ */ 
+#ifndef DROPBEAR_DH_GROUP1
+#define DROPBEAR_DH_GROUP1 1
+#endif
+#ifndef DROPBEAR_DH_GROUP14_SHA1
+#define DROPBEAR_DH_GROUP14_SHA1 1
+#endif
+#ifndef DROPBEAR_DH_GROUP14_SHA256
+#define DROPBEAR_DH_GROUP14_SHA256 1
+#endif
+#ifndef DROPBEAR_DH_GROUP16
+#define DROPBEAR_DH_GROUP16 0
+#endif
+
+/* Control the memory/performance/compression tradeoff for zlib.
+ * Set windowBits=8 for least memory usage, see your system's
+ * zlib.h for full details.
+ * Default settings (windowBits=15) will use 256kB for compression
+ * windowBits=8 will use 129kB for compression.
+ * Both modes will use ~35kB for decompression (using windowBits=15 for
+ * interoperability) */
+#ifndef DROPBEAR_ZLIB_WINDOW_BITS
+#define DROPBEAR_ZLIB_WINDOW_BITS 15 
+#endif
+
+/* Whether to do reverse DNS lookups. */
+#ifndef DO_HOST_LOOKUP
+#define DO_HOST_LOOKUP 0
+#endif
+
+/* Whether to print the message of the day (MOTD). */
+#ifndef DO_MOTD
+#define DO_MOTD 0
+#endif
+
+/* The MOTD file path */
+#ifndef MOTD_FILENAME
+#define MOTD_FILENAME "/etc/motd"
+#endif
+
+/* Authentication Types - at least one required.
+   RFC Draft requires pubkey auth, and recommends password */
+
+/* Note: PAM auth is quite simple and only works for PAM modules which just do
+ * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
+ * It's useful for systems like OS X where standard password crypts don't work
+ * but there's an interface via a PAM module. It won't work for more complex
+ * PAM challenge/response.
+ * You can't enable both PASSWORD and PAM. */
+
+/* This requires crypt() */
+#ifdef HAVE_CRYPT
+#ifndef DROPBEAR_SVR_PASSWORD_AUTH
+#define DROPBEAR_SVR_PASSWORD_AUTH 1
+#endif
+#else
+#ifndef DROPBEAR_SVR_PASSWORD_AUTH
+#define DROPBEAR_SVR_PASSWORD_AUTH 0
+#endif
+#endif
+/* PAM requires ./configure --enable-pam */
+#ifndef DROPBEAR_SVR_PAM_AUTH
+#define DROPBEAR_SVR_PAM_AUTH 0
+#endif
+#ifndef DROPBEAR_SVR_PUBKEY_AUTH
+#define DROPBEAR_SVR_PUBKEY_AUTH 1
+#endif
+
+/* Whether to take public key options in 
+ * authorized_keys file into account */
+#ifndef DROPBEAR_SVR_PUBKEY_OPTIONS
+#define DROPBEAR_SVR_PUBKEY_OPTIONS 1
+#endif
+
+/* This requires getpass. */
+#ifdef HAVE_GETPASS
+#ifndef DROPBEAR_CLI_PASSWORD_AUTH
+#define DROPBEAR_CLI_PASSWORD_AUTH 1
+#endif
+#ifndef DROPBEAR_CLI_INTERACT_AUTH
+#define DROPBEAR_CLI_INTERACT_AUTH 1
+#endif
+#endif
+#ifndef DROPBEAR_CLI_PUBKEY_AUTH
+#define DROPBEAR_CLI_PUBKEY_AUTH 1
+#endif
+
+/* A default argument for dbclient -i <privatekey>. 
+Homedir is prepended unless path begins with / */
+#ifndef DROPBEAR_DEFAULT_CLI_AUTHKEY
+#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
+#endif
+
+/* This variable can be used to set a password for client
+ * authentication on the commandline. Beware of platforms
+ * that don't protect environment variables of processes etc. Also
+ * note that it will be provided for all "hidden" client-interactive
+ * style prompts - if you want something more sophisticated, use 
+ * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
+#ifndef DROPBEAR_PASSWORD_ENV
+#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
+#endif
+
+/* Define this (as well as DROPBEAR_CLI_PASSWORD_AUTH) to allow the use of
+ * a helper program for the ssh client. The helper program should be
+ * specified in the SSH_ASKPASS environment variable, and dbclient
+ * should be run with DISPLAY set and no tty. The program should
+ * return the password on standard output */
+#ifndef DROPBEAR_CLI_ASKPASS_HELPER
+#define DROPBEAR_CLI_ASKPASS_HELPER 0
+#endif
+
+/* Save a network roundtrip by sendng a real auth request immediately after
+ * sending a query for the available methods.  It is at the expense of < 100
+ * bytes of extra network traffic. This is not yet enabled by default since it
+ * could cause problems with non-compliant servers */
+#ifndef DROPBEAR_CLI_IMMEDIATE_AUTH
+#define DROPBEAR_CLI_IMMEDIATE_AUTH 0
+#endif
+
+/* Source for randomness. This must be able to provide hundreds of bytes per SSH
+ * connection without blocking. In addition /dev/random is used for seeding
+ * rsa/dss key generation */
+#ifndef DROPBEAR_URANDOM_DEV
+#define DROPBEAR_URANDOM_DEV "/dev/urandom"
+#endif
+
+/* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
+/*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
+
+
+/* Specify the number of clients we will allow to be connected but
+ * not yet authenticated. After this limit, connections are rejected */
+/* The first setting is per-IP, to avoid denial of service */
+#ifndef MAX_UNAUTH_PER_IP
+#define MAX_UNAUTH_PER_IP 5
+#endif
+
+/* And then a global limit to avoid chewing memory if connections 
+ * come from many IPs */
+#ifndef MAX_UNAUTH_CLIENTS
+#define MAX_UNAUTH_CLIENTS 30
+#endif
+
+/* Maximum number of failed authentication tries (server option) */
+#ifndef MAX_AUTH_TRIES
+#define MAX_AUTH_TRIES 10
+#endif
+
+/* The default file to store the daemon's process ID, for shutdown
+   scripts etc. This can be overridden with the -P flag */
+#ifndef DROPBEAR_PIDFILE
+#define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
+#endif
+
+/* The command to invoke for xauth when using X11 forwarding.
+ * "-q" for quiet */
+#ifndef XAUTH_COMMAND
+#define XAUTH_COMMAND "/usr/bin/xauth -q"
+#endif
+
+/* if you want to enable running an sftp server (such as the one included with
+ * OpenSSH), set the path below. If the path isn't defined, sftp will not
+ * be enabled */
+#ifndef SFTPSERVER_PATH
+#define SFTPSERVER_PATH "/usr/libexec/sftp-server"
+#endif
+
+/* This is used by the scp binary when used as a client binary. If you're
+ * not using the Dropbear client, you'll need to change it */
+#ifndef DROPBEAR_PATH_SSH_PROGRAM
+#define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
+#endif
+
+/* Whether to log commands executed by a client. This only logs the 
+ * (single) command sent to the server, not what a user did in a 
+ * shell/sftp session etc. */
+#ifndef LOG_COMMANDS
+#define LOG_COMMANDS 0
+#endif
+
+/* Window size limits. These tend to be a trade-off between memory
+   usage and network performance: */
+/* Size of the network receive window. This amount of memory is allocated
+   as a per-channel receive buffer. Increasing this value can make a
+   significant difference to network performance. 24kB was empirically
+   chosen for a 100mbit ethernet network. The value can be altered at
+   runtime with the -W argument. */
+#ifndef DEFAULT_RECV_WINDOW
+#define DEFAULT_RECV_WINDOW 24576
+#endif
+/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
+   in order to interoperate with other implementations */
+#ifndef RECV_MAX_PAYLOAD_LEN
+#define RECV_MAX_PAYLOAD_LEN 32768
+#endif
+/* Maximum size of a transmitted data packet - this can be any value,
+   though increasing it may not make a significant difference. */
+#ifndef TRANS_MAX_PAYLOAD_LEN
+#define TRANS_MAX_PAYLOAD_LEN 16384
+#endif
+
+/* Ensure that data is transmitted every KEEPALIVE seconds. This can
+be overridden at runtime with -K. 0 disables keepalives */
+#ifndef DEFAULT_KEEPALIVE
+#define DEFAULT_KEEPALIVE 0
+#endif
+
+/* If this many KEEPALIVES are sent with no packets received from the
+other side, exit. Not run-time configurable - if you have a need
+for runtime configuration please mail the Dropbear list */
+#ifndef DEFAULT_KEEPALIVE_LIMIT
+#define DEFAULT_KEEPALIVE_LIMIT 3
+#endif
+
+/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
+be overridden at runtime with -I. 0 disables idle timeouts */
+#ifndef DEFAULT_IDLE_TIMEOUT
+#define DEFAULT_IDLE_TIMEOUT 0
+#endif
+
+/* The default path. This will often get replaced by the shell */
+#ifndef DEFAULT_PATH
+#define DEFAULT_PATH "/usr/bin:/bin"
+#endif
+
+#endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/default_options.h.in	Thu May 18 23:45:10 2017 +0800
@@ -0,0 +1,312 @@
+#ifndef DROPBEAR_DEFAULT_OPTIONS_H_
+#define DROPBEAR_DEFAULT_OPTIONS_H_
+/*
+                     > > > Read This < < <
+
+default_options.h.in (this file) documents compile-time options, and provides 
+default values.
+
+Local customisation should be added to localoptions.h which is
+used if it exists. Options defined there will override any options in this
+file (#ifndef guards added by ifndef_wrapper.sh).
+
+Options can also be defined with -DDROPBEAR_XXX Makefile CFLAGS
+
+IMPORTANT: Many options will require "make clean" after changes */
+
+#define DROPBEAR_DEFPORT "22"
+
+/* Listen on all interfaces */
+#define DROPBEAR_DEFADDRESS ""
+
+/* Default hostkey paths - these can be specified on the command line */
+#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
+#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
+#define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
+
+/* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
+ * on chosen ports and keeps accepting connections. This is the default.
+ *
+ * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
+ * similar), where it will use stdin/stdout for connections, and each process
+ * lasts for a single connection. Dropbear should be invoked with the -i flag
+ * for inetd, and can only accept IPv4 connections.
+ *
+ * Both of these flags can be defined at once, don't compile without at least
+ * one of them. */
+#define NON_INETD_MODE 1
+#define INETD_MODE 1
+
+/* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
+ * perhaps 20% slower for pubkey operations (it is probably worth experimenting
+ * if you want to use this) */
+/*#define NO_FAST_EXPTMOD*/
+
+/* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
+several kB in binary size however will make the symmetrical ciphers and hashes
+slower, perhaps by 50%. Recommended for small systems that aren't doing
+much traffic. */
+#define DROPBEAR_SMALL_CODE 1
+
+/* Enable X11 Forwarding - server only */
+#define DROPBEAR_X11FWD 1
+
+/* Enable TCP Fowarding */
+/* 'Local' is "-L" style (client listening port forwarded via server)
+ * 'Remote' is "-R" style (server listening port forwarded via client) */
+
+#define DROPBEAR_CLI_LOCALTCPFWD 1
+#define DROPBEAR_CLI_REMOTETCPFWD 1
+
+#define DROPBEAR_SVR_LOCALTCPFWD 1
+#define DROPBEAR_SVR_REMOTETCPFWD 1
+
+/* Enable Authentication Agent Forwarding */
+#define DROPBEAR_SVR_AGENTFWD 1
+#define DROPBEAR_CLI_AGENTFWD 1
+
+
+/* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to
+ * allow multihop dbclient connections */
+
+/* Allow using -J <proxycommand> to run the connection through a 
+   pipe to a program, rather the normal TCP connection */
+#define DROPBEAR_CLI_PROXYCMD 1
+
+/* Enable "Netcat mode" option. This will forward standard input/output
+ * to a remote TCP-forwarded connection */
+#define DROPBEAR_CLI_NETCAT 1
+
+/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
+#define ENABLE_USER_ALGO_LIST 1
+
+/* Encryption - at least one required.
+ * Protocol RFC requires 3DES and recommends AES128 for interoperability.
+ * Including multiple keysize variants the same cipher 
+ * (eg AES256 as well as AES128) will result in a minimal size increase.*/
+#define DROPBEAR_AES128 1
+#define DROPBEAR_3DES 1
+#define DROPBEAR_AES256 1
+/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
+/*#define DROPBEAR_BLOWFISH*/
+#define DROPBEAR_TWOFISH256 1
+#define DROPBEAR_TWOFISH128 1
+
+/* Enable CBC mode for ciphers. This has security issues though
+ * is the most compatible with older SSH implementations */
+#define DROPBEAR_ENABLE_CBC_MODE 1
+
+/* Enable "Counter Mode" for ciphers. This is more secure than normal
+ * CBC mode against certain attacks. It is recommended for security
+ * and forwards compatibility */
+#define DROPBEAR_ENABLE_CTR_MODE 1
+
+/* Twofish counter mode is disabled by default because it 
+has not been tested for interoperability with other SSH implementations.
+If you test it please contact the Dropbear author */
+#define DROPBEAR_TWOFISH_CTR 0
+
+/* Message integrity. sha2-256 is recommended as a default, 
+   sha1 for compatibility */
+#define DROPBEAR_SHA1_HMAC 1
+#define DROPBEAR_SHA1_96_HMAC 1
+#define DROPBEAR_SHA2_256_HMAC 1
+/* Default is to include it is sha512 is being compiled in for ECDSA */
+#define DROPBEAR_SHA2_512_HMAC (DROPBEAR_ECDSA)
+
+/* XXX needed for fingerprints */
+#define DROPBEAR_MD5_HMAC 0
+
+/* Hostkey/public key algorithms - at least one required, these are used
+ * for hostkey as well as for verifying signatures with pubkey auth.
+ * Removing either of these won't save very much space.
+ * RSA is recommended
+ * DSS may be necessary to connect to some systems though
+   is not recommended for new keys */
+#define DROPBEAR_RSA 1
+#define DROPBEAR_DSS 1
+/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
+ * code (either ECDSA or ECDH) increases binary size - around 30kB
+ * on x86-64 */
+#define DROPBEAR_ECDSA 1
+
+/* Add runtime flag "-R" to generate hostkeys as-needed when the first 
+   connection using that key type occurs.
+   This avoids the need to otherwise run "dropbearkey" and avoids some problems
+   with badly seeded /dev/urandom when systems first boot. */
+#define DROPBEAR_DELAY_HOSTKEY 1
+
+/* Enable Curve25519 for key exchange. This is another elliptic
+ * curve method with good security properties. Increases binary size
+ * by ~8kB on x86-64 */
+#define DROPBEAR_CURVE25519 1
+
+/* Enable elliptic curve Diffie Hellman key exchange, see note about
+ * ECDSA above */
+#define DROPBEAR_ECDH 1
+
+/* Key exchange algorithm.
+ * group14_sha1 - 2048 bit, sha1
+ * group14_sha256 - 2048 bit, sha2-256
+ * group16 - 4096 bit, sha2-512
+ * group1 - 1024 bit, sha1
+ *
+ * group14 is supported by most implementations.
+ * group16 provides a greater strength level but is slower and increases binary size
+ * group1 is too small for security though is necessary if you need 
+     compatibility with some implementations such as Dropbear versions < 0.53
+ */ 
+#define DROPBEAR_DH_GROUP1 1
+#define DROPBEAR_DH_GROUP14_SHA1 1
+#define DROPBEAR_DH_GROUP14_SHA256 1
+#define DROPBEAR_DH_GROUP16 0
+
+/* Control the memory/performance/compression tradeoff for zlib.
+ * Set windowBits=8 for least memory usage, see your system's
+ * zlib.h for full details.
+ * Default settings (windowBits=15) will use 256kB for compression
+ * windowBits=8 will use 129kB for compression.
+ * Both modes will use ~35kB for decompression (using windowBits=15 for
+ * interoperability) */
+#define DROPBEAR_ZLIB_WINDOW_BITS 15 
+
+/* Whether to do reverse DNS lookups. */
+#define DO_HOST_LOOKUP 0
+
+/* Whether to print the message of the day (MOTD). */
+#define DO_MOTD 0
+
+/* The MOTD file path */
+#define MOTD_FILENAME "/etc/motd"
+
+/* Authentication Types - at least one required.
+   RFC Draft requires pubkey auth, and recommends password */
+
+/* Note: PAM auth is quite simple and only works for PAM modules which just do
+ * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
+ * It's useful for systems like OS X where standard password crypts don't work
+ * but there's an interface via a PAM module. It won't work for more complex
+ * PAM challenge/response.
+ * You can't enable both PASSWORD and PAM. */
+
+/* This requires crypt() */
+#ifdef HAVE_CRYPT
+#define DROPBEAR_SVR_PASSWORD_AUTH 1
+#else
+#define DROPBEAR_SVR_PASSWORD_AUTH 0
+#endif
+/* PAM requires ./configure --enable-pam */
+#define DROPBEAR_SVR_PAM_AUTH 0
+#define DROPBEAR_SVR_PUBKEY_AUTH 1
+
+/* Whether to take public key options in 
+ * authorized_keys file into account */
+#define DROPBEAR_SVR_PUBKEY_OPTIONS 1
+
+/* This requires getpass. */
+#ifdef HAVE_GETPASS
+#define DROPBEAR_CLI_PASSWORD_AUTH 1
+#define DROPBEAR_CLI_INTERACT_AUTH 1
+#endif
+#define DROPBEAR_CLI_PUBKEY_AUTH 1
+
+/* A default argument for dbclient -i <privatekey>. 
+Homedir is prepended unless path begins with / */
+#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
+
+/* This variable can be used to set a password for client
+ * authentication on the commandline. Beware of platforms
+ * that don't protect environment variables of processes etc. Also
+ * note that it will be provided for all "hidden" client-interactive
+ * style prompts - if you want something more sophisticated, use 
+ * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
+#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
+
+/* Define this (as well as DROPBEAR_CLI_PASSWORD_AUTH) to allow the use of
+ * a helper program for the ssh client. The helper program should be
+ * specified in the SSH_ASKPASS environment variable, and dbclient
+ * should be run with DISPLAY set and no tty. The program should
+ * return the password on standard output */
+#define DROPBEAR_CLI_ASKPASS_HELPER 0
+
+/* Save a network roundtrip by sendng a real auth request immediately after
+ * sending a query for the available methods.  It is at the expense of < 100
+ * bytes of extra network traffic. This is not yet enabled by default since it
+ * could cause problems with non-compliant servers */
+#define DROPBEAR_CLI_IMMEDIATE_AUTH 0
+
+/* Source for randomness. This must be able to provide hundreds of bytes per SSH
+ * connection without blocking. In addition /dev/random is used for seeding
+ * rsa/dss key generation */
+#define DROPBEAR_URANDOM_DEV "/dev/urandom"
+
+/* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
+/*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
+
+
+/* Specify the number of clients we will allow to be connected but
+ * not yet authenticated. After this limit, connections are rejected */
+/* The first setting is per-IP, to avoid denial of service */
+#define MAX_UNAUTH_PER_IP 5
+
+/* And then a global limit to avoid chewing memory if connections 
+ * come from many IPs */
+#define MAX_UNAUTH_CLIENTS 30
+
+/* Maximum number of failed authentication tries (server option) */
+#define MAX_AUTH_TRIES 10
+
+/* The default file to store the daemon's process ID, for shutdown
+   scripts etc. This can be overridden with the -P flag */
+#define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
+
+/* The command to invoke for xauth when using X11 forwarding.
+ * "-q" for quiet */
+#define XAUTH_COMMAND "/usr/bin/xauth -q"
+
+/* if you want to enable running an sftp server (such as the one included with
+ * OpenSSH), set the path below. If the path isn't defined, sftp will not
+ * be enabled */
+#define SFTPSERVER_PATH "/usr/libexec/sftp-server"
+
+/* This is used by the scp binary when used as a client binary. If you're
+ * not using the Dropbear client, you'll need to change it */
+#define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
+
+/* Whether to log commands executed by a client. This only logs the 
+ * (single) command sent to the server, not what a user did in a 
+ * shell/sftp session etc. */
+#define LOG_COMMANDS 0
+
+/* Window size limits. These tend to be a trade-off between memory
+   usage and network performance: */
+/* Size of the network receive window. This amount of memory is allocated
+   as a per-channel receive buffer. Increasing this value can make a
+   significant difference to network performance. 24kB was empirically
+   chosen for a 100mbit ethernet network. The value can be altered at
+   runtime with the -W argument. */
+#define DEFAULT_RECV_WINDOW 24576
+/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
+   in order to interoperate with other implementations */
+#define RECV_MAX_PAYLOAD_LEN 32768
+/* Maximum size of a transmitted data packet - this can be any value,
+   though increasing it may not make a significant difference. */
+#define TRANS_MAX_PAYLOAD_LEN 16384
+
+/* Ensure that data is transmitted every KEEPALIVE seconds. This can
+be overridden at runtime with -K. 0 disables keepalives */
+#define DEFAULT_KEEPALIVE 0
+
+/* If this many KEEPALIVES are sent with no packets received from the
+other side, exit. Not run-time configurable - if you have a need
+for runtime configuration please mail the Dropbear list */
+#define DEFAULT_KEEPALIVE_LIMIT 3
+
+/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
+be overridden at runtime with -I. 0 disables idle timeouts */
+#define DEFAULT_IDLE_TIMEOUT 0
+
+/* The default path. This will often get replaced by the shell */
+#define DEFAULT_PATH "/usr/bin:/bin"
+
+#endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */
--- a/dropbear.8	Thu May 18 23:38:30 2017 +0800
+++ b/dropbear.8	Thu May 18 23:45:10 2017 +0800
@@ -91,6 +91,10 @@
 .B \-I \fIidle_timeout
 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
 .TP
+.B \-c \fIforced_command
+Disregard the command provided by the user and always run \fIforced_command\fR. This also
+overrides any authorized_keys command= option.
+.TP
 .B \-V
 Print the version
 
@@ -129,6 +133,7 @@
 .TP
 .B command=\fR"\fIforced_command\fR"
 Disregard the command provided by the user and always run \fIforced_command\fR.
+The -c command line option overrides this.
 
 The authorized_keys file and its containing ~/.ssh directory must only be
 writable by the user, otherwise Dropbear will not allow a login using public
--- a/dropbearconvert.c	Thu May 18 23:38:30 2017 +0800
+++ b/dropbearconvert.c	Thu May 18 23:45:10 2017 +0800
@@ -53,8 +53,8 @@
 					progname);
 }
 
-#if defined(DBMULTI_dropbearconvert) || !defined(DROPBEAR_MULTI)
-#if defined(DBMULTI_dropbearconvert) && defined(DROPBEAR_MULTI)
+#if defined(DBMULTI_dropbearconvert) || !DROPBEAR_MULTI
+#if defined(DBMULTI_dropbearconvert) && DROPBEAR_MULTI
 int dropbearconvert_main(int argc, char ** argv) {
 #else 
 int main(int argc, char ** argv) {
@@ -67,7 +67,7 @@
 	crypto_init();
 	seedrandom();
 
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 	/* It's hard for it to get in the way _too_ much */
 	debug_trace = 1;
 #endif
--- a/dropbearkey.c	Thu May 18 23:38:30 2017 +0800
+++ b/dropbearkey.c	Thu May 18 23:45:10 2017 +0800
@@ -67,36 +67,36 @@
 
 	fprintf(stderr, "Usage: %s -t <type> -f <filename> [-s bits]\n"
 					"-t type	Type of key to generate. One of:\n"
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 					"		rsa\n"
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 					"		dss\n"
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 					"		ecdsa\n"
 #endif
 					"-f filename    Use filename for the secret key.\n"
 					"               ~/.ssh/id_dropbear is recommended for client keys.\n"
 					"-s bits	Key size in bits, should be a multiple of 8 (optional)\n"
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 					"           DSS has a fixed size of 1024 bits\n"
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 					"           ECDSA has sizes "
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 					"256 "
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 					"384 "
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 					"521 "
 #endif
 					"\n"
 #endif
 					"-y		Just print the publickey and fingerprint for the\n		private key in <filename>.\n"
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 					"-v		verbose\n"
 #endif
 					,progname);
@@ -106,7 +106,7 @@
 static void check_signkey_bits(enum signkey_type type, int bits)
 {
 	switch (type) {
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
 			if (bits < 512 || bits > 4096 || (bits % 8 != 0)) {
 				dropbear_exit("Bits must satisfy 512 <= bits <= 4096, and be a"
@@ -126,8 +126,8 @@
 	}
 }
 
-#if defined(DBMULTI_dropbearkey) || !defined(DROPBEAR_MULTI)
-#if defined(DBMULTI_dropbearkey) && defined(DROPBEAR_MULTI)
+#if defined(DBMULTI_dropbearkey) || !DROPBEAR_MULTI
+#if defined(DBMULTI_dropbearkey) && DROPBEAR_MULTI
 int dropbearkey_main(int argc, char ** argv) {
 #else
 int main(int argc, char ** argv) {
@@ -174,7 +174,7 @@
 					printhelp(argv[0]);
 					exit(EXIT_SUCCESS);
 					break;
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 				case 'v':
 					debug_trace = 1;
 					break;
@@ -206,19 +206,19 @@
 		exit(EXIT_FAILURE);
 	}
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (strcmp(typetext, "rsa") == 0)
 	{
 		keytype = DROPBEAR_SIGNKEY_RSA;
 	}
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (strcmp(typetext, "dss") == 0)
 	{
 		keytype = DROPBEAR_SIGNKEY_DSS;
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (strcmp(typetext, "ecdsa") == 0)
 	{
 		keytype = DROPBEAR_SIGNKEY_ECDSA_KEYGEN;
@@ -241,7 +241,7 @@
 	}
 
 	fprintf(stderr, "Generating key, this may take a while...\n");
-	if (signkey_generate(keytype, bits, filename) == DROPBEAR_FAILURE)
+	if (signkey_generate(keytype, bits, filename, 0) == DROPBEAR_FAILURE)
 	{
 		dropbear_exit("Failed to generate key.\n");
 	}
--- a/dss.c	Thu May 18 23:38:30 2017 +0800
+++ b/dss.c	Thu May 18 23:45:10 2017 +0800
@@ -37,7 +37,7 @@
  * See FIPS186 or the Handbook of Applied Cryptography for details of the
  * algorithm */
 
-#ifdef DROPBEAR_DSS 
+#if DROPBEAR_DSS 
 
 /* Load a dss key from a buffer, initialising the values.
  * The key will have the same format as buf_put_dss_key.
@@ -153,7 +153,7 @@
 
 }
 
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 /* Verify a DSS signature (in buf) made on data by the key given. 
  * returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
 int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf) {
--- a/dss.h	Thu May 18 23:38:30 2017 +0800
+++ b/dss.h	Thu May 18 23:45:10 2017 +0800
@@ -28,7 +28,7 @@
 #include "includes.h"
 #include "buffer.h"
 
-#ifdef DROPBEAR_DSS 
+#if DROPBEAR_DSS 
 
 typedef struct {
 
@@ -42,7 +42,7 @@
 } dropbear_dss_key;
 
 void buf_put_dss_sign(buffer* buf, dropbear_dss_key *key, buffer *data_buf);
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 int buf_dss_verify(buffer* buf, dropbear_dss_key *key, buffer *data_buf);
 #endif
 int buf_get_dss_pub_key(buffer* buf, dropbear_dss_key *key);
--- a/ecc.c	Thu May 18 23:38:30 2017 +0800
+++ b/ecc.c	Thu May 18 23:45:10 2017 +0800
@@ -4,10 +4,10 @@
 #include "dbutil.h"
 #include "bignum.h"
 
-#ifdef DROPBEAR_ECC
+#if DROPBEAR_ECC
 
 /* .dp members are filled out by dropbear_ecc_fill_dp() at startup */
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 struct dropbear_ecc_curve ecc_curve_nistp256 = {
 	32,		/* .ltc_size	*/
 	NULL,		/* .dp		*/
@@ -15,7 +15,7 @@
 	"nistp256"	/* .name	*/
 };
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 struct dropbear_ecc_curve ecc_curve_nistp384 = {
 	48,		/* .ltc_size	*/
 	NULL,		/* .dp		*/
@@ -23,7 +23,7 @@
 	"nistp384"	/* .name	*/
 };
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 struct dropbear_ecc_curve ecc_curve_nistp521 = {
 	66,		/* .ltc_size	*/
 	NULL,		/* .dp		*/
@@ -33,13 +33,13 @@
 #endif
 
 struct dropbear_ecc_curve *dropbear_ecc_curves[] = {
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 	&ecc_curve_nistp256,
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	&ecc_curve_nistp384,
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	&ecc_curve_nistp521,
 #endif
 	NULL
--- a/ecc.h	Thu May 18 23:38:30 2017 +0800
+++ b/ecc.h	Thu May 18 23:45:10 2017 +0800
@@ -6,7 +6,7 @@
 
 #include "buffer.h"
 
-#ifdef DROPBEAR_ECC
+#if DROPBEAR_ECC
 
 struct dropbear_ecc_curve {
 	int ltc_size; /* to match the byte sizes in ltc_ecc_sets[] */
--- a/ecdsa.c	Thu May 18 23:38:30 2017 +0800
+++ b/ecdsa.c	Thu May 18 23:45:10 2017 +0800
@@ -6,7 +6,7 @@
 #include "ecdsa.h"
 #include "signkey.h"
 
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 
 int signkey_is_ecdsa(enum signkey_type type)
 {
@@ -16,17 +16,17 @@
 }
 
 enum signkey_type ecdsa_signkey_type(ecc_key * key) {
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 	if (key->dp == ecc_curve_nistp256.dp) {
 		return DROPBEAR_SIGNKEY_ECDSA_NISTP256;
 	}
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	if (key->dp == ecc_curve_nistp384.dp) {
 		return DROPBEAR_SIGNKEY_ECDSA_NISTP384;
 	}
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	if (key->dp == ecc_curve_nistp521.dp) {
 		return DROPBEAR_SIGNKEY_ECDSA_NISTP521;
 	}
@@ -38,17 +38,17 @@
 	const ltc_ecc_set_type *dp = NULL; /* curve domain parameters */
 	ecc_key *new_key = NULL;
 	switch (bit_size) {
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 		case 256:
 			dp = ecc_curve_nistp256.dp;
 			break;
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 		case 384:
 			dp = ecc_curve_nistp384.dp;
 			break;
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 		case 521:
 			dp = ecc_curve_nistp521.dp;
 			break;
@@ -56,13 +56,13 @@
 	}
 	if (!dp) {
 		dropbear_exit("Key size %d isn't valid. Try "
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECC_256
 			"256 "
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 			"384 "
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 			"521 "
 #endif
 			, bit_size);
--- a/ecdsa.h	Thu May 18 23:38:30 2017 +0800
+++ b/ecdsa.h	Thu May 18 23:45:10 2017 +0800
@@ -5,14 +5,14 @@
 #include "buffer.h"
 #include "signkey.h"
 
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 
 /* Prefer the larger size - it's fast anyway */
-#if defined(DROPBEAR_ECC_521)
+#if DROPBEAR_ECC_521
 #define ECDSA_DEFAULT_SIZE 521
-#elif defined(DROPBEAR_ECC_384)
+#elif DROPBEAR_ECC_384
 #define ECDSA_DEFAULT_SIZE 384
-#elif defined(DROPBEAR_ECC_256)
+#elif DROPBEAR_ECC_256
 #define ECDSA_DEFAULT_SIZE 256
 #else
 #define ECDSA_DEFAULT_SIZE 0
--- a/gendss.c	Thu May 18 23:38:30 2017 +0800
+++ b/gendss.c	Thu May 18 23:45:10 2017 +0800
@@ -35,7 +35,7 @@
 
 /* This is just a test */
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 
 static void getq(dropbear_dss_key *key);
 static void getp(dropbear_dss_key *key, unsigned int size);
--- a/gendss.h	Thu May 18 23:38:30 2017 +0800
+++ b/gendss.h	Thu May 18 23:45:10 2017 +0800
@@ -27,7 +27,7 @@
 
 #include "dss.h"
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 
 dropbear_dss_key * gen_dss_priv_key(unsigned int size);
 
--- a/genrsa.c	Thu May 18 23:38:30 2017 +0800
+++ b/genrsa.c	Thu May 18 23:45:10 2017 +0800
@@ -31,7 +31,7 @@
 
 #define RSA_E 65537
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 
 static void getrsaprime(mp_int* prime, mp_int *primeminus, 
 		mp_int* rsa_e, unsigned int size_bytes);
--- a/genrsa.h	Thu May 18 23:38:30 2017 +0800
+++ b/genrsa.h	Thu May 18 23:45:10 2017 +0800
@@ -27,7 +27,7 @@
 
 #include "rsa.h"
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 
 dropbear_rsa_key * gen_rsa_priv_key(unsigned int size);
 
--- a/gensignkey.c	Thu May 18 23:38:30 2017 +0800
+++ b/gensignkey.c	Thu May 18 23:45:10 2017 +0800
@@ -53,15 +53,15 @@
 static int get_default_bits(enum signkey_type keytype)
 {
 	switch (keytype) {
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
 			return RSA_DEFAULT_SIZE;
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 		case DROPBEAR_SIGNKEY_DSS:
 			return DSS_DEFAULT_SIZE;
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 		case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
 			return ECDSA_DEFAULT_SIZE;
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
@@ -76,10 +76,12 @@
 	}
 }
 
-int signkey_generate(enum signkey_type keytype, int bits, const char* filename)
+/* if skip_exist is set it will silently return if the key file exists */
+int signkey_generate(enum signkey_type keytype, int bits, const char* filename, int skip_exist)
 {
 	sign_key * key = NULL;
 	buffer *buf = NULL;
+	char *fn_temp = NULL;
 	int ret = DROPBEAR_FAILURE;
 	if (bits == 0)
 	{
@@ -92,17 +94,17 @@
 	seedrandom();
 
 	switch(keytype) {
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
 			key->rsakey = gen_rsa_priv_key(bits);
 			break;
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 		case DROPBEAR_SIGNKEY_DSS:
 			key->dsskey = gen_dss_priv_key(bits);
 			break;
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 		case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
@@ -126,10 +128,37 @@
 	sign_key_free(key);
 	key = NULL;
 	buf_setpos(buf, 0);
-	ret = buf_writefile(buf, filename);
+
+	fn_temp = m_malloc(strlen(filename) + 30);
+	snprintf(fn_temp, strlen(filename)+30, "%s.tmp%d", filename, getpid());
+	ret = buf_writefile(buf, fn_temp);
+
+	if (ret == DROPBEAR_FAILURE) {
+		goto out;
+	}
 
-	buf_burn(buf);
-	buf_free(buf);
-	buf = NULL;
+	if (link(fn_temp, filename) < 0) {
+		/* If generating keys on connection (skipexist) it's OK to get EEXIST 
+		- we probably just lost a race with another connection to generate the key */
+		if (!(skip_exist && errno == EEXIST)) {
+			dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", filename,
+				strerror(errno));
+			/* XXX fallback to non-atomic copy for some filesystems? */
+			ret = DROPBEAR_FAILURE;
+			goto out;
+		}
+	}
+
+out:
+	if (buf) {
+		buf_burn(buf);
+		buf_free(buf);
+	}
+	
+	if (fn_temp) {
+		unlink(fn_temp);
+		m_free(fn_temp);
+	}
+
 	return ret;
 }
--- a/gensignkey.h	Thu May 18 23:38:30 2017 +0800
+++ b/gensignkey.h	Thu May 18 23:45:10 2017 +0800
@@ -3,6 +3,6 @@
 
 #include "signkey.h"
 
-int signkey_generate(enum signkey_type type, int bits, const char* filename);
+int signkey_generate(enum signkey_type type, int bits, const char* filename, int skip_exist);
 
 #endif
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ifndef_wrapper.sh	Thu May 18 23:45:10 2017 +0800
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Wrap all "#define X Y" with a #ifndef X...#endif"
+
+sed -E 's/^(#define ([^ ]+) .*)/#ifndef \2\
+\1\
+#endif/' 
--- a/kex.h	Thu May 18 23:38:30 2017 +0800
+++ b/kex.h	Thu May 18 23:45:10 2017 +0800
@@ -40,14 +40,14 @@
 void kexdh_comb_key(struct kex_dh_param *param, mp_int *dh_pub_them,
 		sign_key *hostkey);
 
-#ifdef DROPBEAR_ECDH
+#if DROPBEAR_ECDH
 struct kex_ecdh_param *gen_kexecdh_param(void);
 void free_kexecdh_param(struct kex_ecdh_param *param);
 void kexecdh_comb_key(struct kex_ecdh_param *param, buffer *pub_them,
 		sign_key *hostkey);
 #endif
 
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 struct kex_curve25519_param *gen_kexcurve25519_param(void);
 void free_kexcurve25519_param(struct kex_curve25519_param *param);
 void kexcurve25519_comb_key(struct kex_curve25519_param *param, buffer *pub_them,
@@ -88,13 +88,13 @@
 	mp_int priv; /* x */
 };
 
-#ifdef DROPBEAR_ECDH
+#if DROPBEAR_ECDH
 struct kex_ecdh_param {
 	ecc_key key;
 };
 #endif
 
-#ifdef DROPBEAR_CURVE25519
+#if DROPBEAR_CURVE25519
 #define CURVE25519_LEN 32
 struct kex_curve25519_param {
 	unsigned char priv[CURVE25519_LEN];
--- a/keyimport.c	Thu May 18 23:38:30 2017 +0800
+++ b/keyimport.c	Thu May 18 23:45:10 2017 +0800
@@ -36,9 +36,11 @@
 #include "dbutil.h"
 #include "ecc.h"
 
+#if DROPBEAR_ECDSA
 static const unsigned char OID_SEC256R1_BLOB[] = {0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07};
 static const unsigned char OID_SEC384R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x22};
 static const unsigned char OID_SEC521R1_BLOB[] = {0x2b, 0x81, 0x04, 0x00, 0x23};
+#endif
 
 #define PUT_32BIT(cp, value) do { \
   (cp)[3] = (unsigned char)(value); \
@@ -71,11 +73,11 @@
 
 int import_encrypted(const char* filename, int filetype) {
 
-		if (filetype == KEYFILE_OPENSSH) {
-				return openssh_encrypted(filename);
+	if (filetype == KEYFILE_OPENSSH) {
+		return openssh_encrypted(filename);
 #if 0
-		} else if (filetype == KEYFILE_SSHCOM) {
-				return sshcom_encrypted(filename, NULL);
+	} else if (filetype == KEYFILE_SSHCOM) {
+		return sshcom_encrypted(filename, NULL);
 #endif
 	}
 	return 0;
@@ -83,101 +85,101 @@
 
 sign_key *import_read(const char *filename, char *passphrase, int filetype) {
 
-		if (filetype == KEYFILE_OPENSSH) {
-				return openssh_read(filename, passphrase);
-		} else if (filetype == KEYFILE_DROPBEAR) {
-				return dropbear_read(filename);
+	if (filetype == KEYFILE_OPENSSH) {
+		return openssh_read(filename, passphrase);
+	} else if (filetype == KEYFILE_DROPBEAR) {
+		return dropbear_read(filename);
 #if 0
-		} else if (filetype == KEYFILE_SSHCOM) {
-				return sshcom_read(filename, passphrase);
+	} else if (filetype == KEYFILE_SSHCOM) {
+		return sshcom_read(filename, passphrase);
 #endif
-		}
+	}
 	return NULL;
 }
 
 int import_write(const char *filename, sign_key *key, char *passphrase,
-				int filetype) {
+		int filetype) {
 
-		if (filetype == KEYFILE_OPENSSH) {
-				return openssh_write(filename, key, passphrase);
-		} else if (filetype == KEYFILE_DROPBEAR) {
-				return dropbear_write(filename, key);
+	if (filetype == KEYFILE_OPENSSH) {
+		return openssh_write(filename, key, passphrase);
+	} else if (filetype == KEYFILE_DROPBEAR) {
+		return dropbear_write(filename, key);
 #if 0
-		} else if (filetype == KEYFILE_SSHCOM) {
-				return sshcom_write(filename, key, passphrase);
+	} else if (filetype == KEYFILE_SSHCOM) {
+		return sshcom_write(filename, key, passphrase);
 #endif
-		}
+	}
 	return 0;
 }
 
 static sign_key *dropbear_read(const char* filename) {
 
-		buffer * buf = NULL;
-		sign_key *ret = NULL;
-		enum signkey_type type;
+	buffer * buf = NULL;
+	sign_key *ret = NULL;
+	enum signkey_type type;
 
-		buf = buf_new(MAX_PRIVKEY_SIZE);
-		if (buf_readfile(buf, filename) == DROPBEAR_FAILURE) {
-				goto error;
-		}
+	buf = buf_new(MAX_PRIVKEY_SIZE);
+	if (buf_readfile(buf, filename) == DROPBEAR_FAILURE) {
+		goto error;
+	}
 
-		buf_setpos(buf, 0);
-		ret = new_sign_key();
+	buf_setpos(buf, 0);
+	ret = new_sign_key();
 
-		type = DROPBEAR_SIGNKEY_ANY;
-		if (buf_get_priv_key(buf, ret, &type) == DROPBEAR_FAILURE){
-				goto error;
-		}
-		buf_free(buf);
+	type = DROPBEAR_SIGNKEY_ANY;
+	if (buf_get_priv_key(buf, ret, &type) == DROPBEAR_FAILURE){
+		goto error;
+	}
+	buf_free(buf);
 
-		ret->type = type;
+	ret->type = type;
 
-		return ret;
+	return ret;
 
 error:
-		if (buf) {
-				buf_free(buf);
-		}
-		if (ret) {
-				sign_key_free(ret);
-		}
-		return NULL;
+	if (buf) {
+		buf_free(buf);
+	}
+	if (ret) {
+		sign_key_free(ret);
+	}
+	return NULL;
 }
 
 /* returns 0 on fail, 1 on success */
 static int dropbear_write(const char*filename, sign_key * key) {
 
-		buffer * buf;
-		FILE*fp;
-		int len;
-		int ret;
+	buffer * buf;
+	FILE*fp;
+	int len;
+	int ret;
 
-		buf = buf_new(MAX_PRIVKEY_SIZE);
-		buf_put_priv_key(buf, key, key->type);
+	buf = buf_new(MAX_PRIVKEY_SIZE);
+	buf_put_priv_key(buf, key, key->type);
 
-		fp = fopen(filename, "w");
-		if (!fp) {
-				ret = 0;
-				goto out;
-		}
+	fp = fopen(filename, "w");
+	if (!fp) {
+		ret = 0;
+		goto out;
+	}
 
-		buf_setpos(buf, 0);
-		do {
-				len = fwrite(buf_getptr(buf, buf->len - buf->pos),
-								1, buf->len - buf->pos, fp);
-				buf_incrpos(buf, len);
-		} while (len > 0 && buf->len != buf->pos);
+	buf_setpos(buf, 0);
+	do {
+		len = fwrite(buf_getptr(buf, buf->len - buf->pos),
+				1, buf->len - buf->pos, fp);
+		buf_incrpos(buf, len);
+	} while (len > 0 && buf->len != buf->pos);
 
-		fclose(fp);
+	fclose(fp);
 
-		if (buf->pos != buf->len) {
-				ret = 0;
-		} else {
-				ret = 1;
-		}
+	if (buf->pos != buf->len) {
+		ret = 0;
+	} else {
+		ret = 1;
+	}
 out:
-		buf_free(buf);
-		return ret;
+	buf_free(buf);
+	return ret;
 }
 
 
@@ -185,7 +187,7 @@
  * Helper routines. (The base64 ones are defined in sshpubk.c.)
  */
 
-#define isbase64(c) (    ((c) >= 'A' && (c) <= 'Z') || \
+#define isbase64(c) (	((c) >= 'A' && (c) <= 'Z') || \
 						 ((c) >= 'a' && (c) <= 'z') || \
 						 ((c) >= '0' && (c) <= '9') || \
 						 (c) == '+' || (c) == '/' || (c) == '=' \
@@ -193,24 +195,24 @@
 
 /* cpl has to be less than 100 */
 static void base64_encode_fp(FILE * fp, unsigned char *data,
-				int datalen, int cpl)
+		int datalen, int cpl)
 {
-		unsigned char out[100];
-		int n;
-		unsigned long outlen;
-		int rawcpl;
-		rawcpl = cpl * 3 / 4;
-		dropbear_assert((unsigned int)cpl < sizeof(out));
+	unsigned char out[100];
+	int n;
+	unsigned long outlen;
+	int rawcpl;
+	rawcpl = cpl * 3 / 4;
+	dropbear_assert((unsigned int)cpl < sizeof(out));
 
-		while (datalen > 0) {
-				n = (datalen < rawcpl ? datalen : rawcpl);
-				outlen = sizeof(out);
-				base64_encode(data, n, out, &outlen);
-				data += n;
-				datalen -= n;
-				fwrite(out, 1, outlen, fp);
-				fputc('\n', fp);
-		}
+	while (datalen > 0) {
+		n = (datalen < rawcpl ? datalen : rawcpl);
+		outlen = sizeof(out);
+		base64_encode(data, n, out, &outlen);
+		data += n;
+		datalen -= n;
+		fwrite(out, 1, outlen, fp);
+		fputc('\n', fp);
+	}
 }
 /*
  * Read an ASN.1/BER identifier and length pair.
@@ -222,14 +224,14 @@
  */
 
 /* ASN.1 tag classes. */
-#define ASN1_CLASS_UNIVERSAL        (0 << 6)
-#define ASN1_CLASS_APPLICATION      (1 << 6)
+#define ASN1_CLASS_UNIVERSAL		(0 << 6)
+#define ASN1_CLASS_APPLICATION	  (1 << 6)
 #define ASN1_CLASS_CONTEXT_SPECIFIC (2 << 6)
-#define ASN1_CLASS_PRIVATE          (3 << 6)
-#define ASN1_CLASS_MASK             (3 << 6)
+#define ASN1_CLASS_PRIVATE		  (3 << 6)
+#define ASN1_CLASS_MASK			 (3 << 6)
 
 /* Primitive versus constructed bit. */
-#define ASN1_CONSTRUCTED            (1 << 5)
+#define ASN1_CONSTRUCTED			(1 << 5)
 
 static int ber_read_id_len(void *source, int sourcelen,
 						   int *id, int *length, int *flags)
@@ -309,7 +311,7 @@
 		len++;
 		if (d) *d++ = 0x1F | flags;
 		for (n = 1; (id >> (7*n)) > 0; n++)
-			continue;                  /* count the bytes */
+			continue;					   /* count the bytes */
 		while (n--) {
 			len++;
 			if (d) *d++ = (n ? 0x80 : 0) | ((id >> (7*n)) & 0x7F);
@@ -330,7 +332,7 @@
 		 * encode the actual length.
 		 */
 		for (n = 1; (length >> (8*n)) > 0; n++)
-			continue;                  /* count the bytes */
+			continue;					   /* count the bytes */
 		len++;
 		if (d) *d++ = 0x80 | n;
 		while (n--) {
@@ -356,29 +358,29 @@
 	int encrypted;
 	char iv[32];
 	unsigned char *keyblob;
-		unsigned int keyblob_len, keyblob_size;
+	unsigned int keyblob_len, keyblob_size;
 };
 
 static struct openssh_key *load_openssh_key(const char *filename)
 {
 	struct openssh_key *ret;
-		FILE *fp = NULL;
+	FILE *fp = NULL;
 	char buffer[256];
-		char *errmsg = NULL, *p = NULL;
+	char *errmsg = NULL, *p = NULL;
 	int headers_done;
-		unsigned long len, outlen;
+	unsigned long len, outlen;
 
-		ret = (struct openssh_key*)m_malloc(sizeof(struct openssh_key));
+	ret = (struct openssh_key*)m_malloc(sizeof(struct openssh_key));
 	ret->keyblob = NULL;
 	ret->keyblob_len = ret->keyblob_size = 0;
 	ret->encrypted = 0;
 	memset(ret->iv, 0, sizeof(ret->iv));
 
-		if (strlen(filename) == 1 && filename[0] == '-') {
-				fp = stdin;
-		} else {
-				fp = fopen(filename, "r");
-		}
+	if (strlen(filename) == 1 && filename[0] == '-') {
+		fp = stdin;
+	} else {
+		fp = fopen(filename, "r");
+	}
 	if (!fp) {
 		errmsg = "Unable to open key file";
 		goto error;
@@ -393,8 +395,8 @@
 		ret->type = OSSH_RSA;
 	else if (!strcmp(buffer, "-----BEGIN DSA PRIVATE KEY-----\n"))
 		ret->type = OSSH_DSA;
-		else if (!strcmp(buffer, "-----BEGIN EC PRIVATE KEY-----\n"))
-				ret->type = OSSH_EC;
+	else if (!strcmp(buffer, "-----BEGIN EC PRIVATE KEY-----\n"))
+		ret->type = OSSH_EC;
 	else {
 		errmsg = "Unrecognised key type";
 		goto error;
@@ -408,7 +410,7 @@
 		}
 		if (0 == strncmp(buffer, "-----END ", 9) &&
 			0 == strcmp(buffer+strlen(buffer)-17, "PRIVATE KEY-----\n"))
-			break;                     /* done */
+			break;					   /* done */
 		if ((p = strchr(buffer, ':')) != NULL) {
 			if (headers_done) {
 				errmsg = "Header found in body of key data";
@@ -445,22 +447,22 @@
 			}
 		} else {
 			headers_done = 1;
-						len = strlen(buffer);
-						outlen = len*4/3;
-						if (ret->keyblob_len + outlen > ret->keyblob_size) {
-								ret->keyblob_size = ret->keyblob_len + outlen + 256;
-								ret->keyblob = (unsigned char*)m_realloc(ret->keyblob,
-												ret->keyblob_size);
-						}
-						outlen = ret->keyblob_size - ret->keyblob_len;
-						if (base64_decode((const unsigned char *)buffer, len,
-												ret->keyblob + ret->keyblob_len, &outlen) != CRYPT_OK){
-								errmsg = "Error decoding base64";
-						goto error;
-					}
-						ret->keyblob_len += outlen;
-				}
+			len = strlen(buffer);
+			outlen = len*4/3;
+			if (ret->keyblob_len + outlen > ret->keyblob_size) {
+				ret->keyblob_size = ret->keyblob_len + outlen + 256;
+				ret->keyblob = (unsigned char*)m_realloc(ret->keyblob,
+						ret->keyblob_size);
+			}
+			outlen = ret->keyblob_size - ret->keyblob_len;
+			if (base64_decode((const unsigned char *)buffer, len,
+						ret->keyblob + ret->keyblob_len, &outlen) != CRYPT_OK){
+				errmsg = "Error decoding base64";
+				goto error;
+			}
+			ret->keyblob_len += outlen;
 		}
+	}
 
 	if (ret->keyblob_len == 0 || !ret->keyblob) {
 		errmsg = "Key body not present";
@@ -509,31 +511,31 @@
 
 static sign_key *openssh_read(const char *filename, char * UNUSED(passphrase))
 {
-		struct openssh_key *key;
+	struct openssh_key *key;
 	unsigned char *p;
 	int ret, id, len, flags;
-		int i, num_integers = 0;
-		sign_key *retval = NULL;
+	int i, num_integers = 0;
+	sign_key *retval = NULL;
 	char *errmsg;
-		unsigned char *modptr = NULL;
-		int modlen = -9999;
-		enum signkey_type type;
+	unsigned char *modptr = NULL;
+	int modlen = -9999;
+	enum signkey_type type;
 
-		sign_key *retkey;
-		buffer * blobbuf = NULL;
+	sign_key *retkey;
+	buffer * blobbuf = NULL;
 
-		retkey = new_sign_key();
+	retkey = new_sign_key();
 
-		key = load_openssh_key(filename);
+	key = load_openssh_key(filename);
 
 	if (!key)
 		return NULL;
 
 	if (key->encrypted) {
-				errmsg = "encrypted keys not supported currently";
-				goto error;
+		errmsg = "encrypted keys not supported currently";
+		goto error;
 #if 0
-				/* matt TODO */
+		/* matt TODO */
 		/*
 		 * Derive encryption key from passphrase and iv/salt:
 		 * 
@@ -578,11 +580,11 @@
 	 * depends on the key type:
 	 *
 	 *  - For RSA, we expect the integers to be 0, n, e, d, p, q,
-	 *    dmp1, dmq1, iqmp in that order. (The last three are d mod
-	 *    (p-1), d mod (q-1), inverse of q mod p respectively.)
+	 *	dmp1, dmq1, iqmp in that order. (The last three are d mod
+	 *	(p-1), d mod (q-1), inverse of q mod p respectively.)
 	 *
 	 *  - For DSA, we expect them to be 0, p, q, g, y, x in that
-	 *    order.
+	 *	order.
 	 */
 	
 	p = key->keyblob;
@@ -601,25 +603,25 @@
 		num_integers = 9;
 	else if (key->type == OSSH_DSA)
 		num_integers = 6;
-		else if (key->type == OSSH_EC)
-				num_integers = 1;
+	else if (key->type == OSSH_EC)
+		num_integers = 1;
 
 	/*
 	 * Space to create key blob in.
 	 */
-		blobbuf = buf_new(3000);
+	blobbuf = buf_new(3000);
 
-#ifdef DROPBEAR_DSS
-		if (key->type == OSSH_DSA) {
-				buf_putstring(blobbuf, "ssh-dss", 7);
-				retkey->type = DROPBEAR_SIGNKEY_DSS;
-		} 
+#if DROPBEAR_DSS
+	if (key->type == OSSH_DSA) {
+		buf_putstring(blobbuf, "ssh-dss", 7);
+		retkey->type = DROPBEAR_SIGNKEY_DSS;
+	} 
 #endif
-#ifdef DROPBEAR_RSA
-		if (key->type == OSSH_RSA) {
-				buf_putstring(blobbuf, "ssh-rsa", 7);
-				retkey->type = DROPBEAR_SIGNKEY_RSA;
-		}
+#if DROPBEAR_RSA
+	if (key->type == OSSH_RSA) {
+		buf_putstring(blobbuf, "ssh-rsa", 7);
+		retkey->type = DROPBEAR_SIGNKEY_RSA;
+	}
 #endif
 
 	for (i = 0; i < num_integers; i++) {
@@ -633,160 +635,160 @@
 		}
 
 		if (i == 0) {
-						/* First integer is a version indicator */
-						int expected = -1;
-						switch (key->type) {
-								case OSSH_RSA:
-								case OSSH_DSA:
-										expected = 0;
-										break;
-								case OSSH_EC:
-										expected = 1;
-										break;
-						}
-						if (len != 1 || p[0] != expected) {
+			/* First integer is a version indicator */
+			int expected = -1;
+			switch (key->type) {
+				case OSSH_RSA:
+				case OSSH_DSA:
+					expected = 0;
+					break;
+				case OSSH_EC:
+					expected = 1;
+					break;
+			}
+			if (len != 1 || p[0] != expected) {
 				errmsg = "Version number mismatch";
 				goto error;
 			}
 		} else if (key->type == OSSH_RSA) {
 			/*
-						 * OpenSSH key order is n, e, d, p, q, dmp1, dmq1, iqmp
-						 * but we want e, n, d, p, q
+			 * OpenSSH key order is n, e, d, p, q, dmp1, dmq1, iqmp
+			 * but we want e, n, d, p, q
 			 */
 			if (i == 1) {
 				/* Save the details for after we deal with number 2. */
-								modptr = p;
+				modptr = p;
 				modlen = len;
-						} else if (i >= 2 && i <= 5) {
-								buf_putstring(blobbuf, (const char*)p, len);
+			} else if (i >= 2 && i <= 5) {
+				buf_putstring(blobbuf, (const char*)p, len);
 				if (i == 2) {
-										buf_putstring(blobbuf, (const char*)modptr, modlen);
+					buf_putstring(blobbuf, (const char*)modptr, modlen);
 				}
 			}
 		} else if (key->type == OSSH_DSA) {
 			/*
-						 * OpenSSH key order is p, q, g, y, x,
-						 * we want the same.
+			 * OpenSSH key order is p, q, g, y, x,
+			 * we want the same.
 			 */
-						buf_putstring(blobbuf, (const char*)p, len);
+			buf_putstring(blobbuf, (const char*)p, len);
 		}
 
 		/* Skip past the number. */
 		p += len;
 	}
 
-#ifdef DROPBEAR_ECDSA
-		if (key->type == OSSH_EC) {
-				unsigned char* private_key_bytes = NULL;
-				int private_key_len = 0;
-				unsigned char* public_key_bytes = NULL;
-				int public_key_len = 0;
-				ecc_key *ecc = NULL;
-				const struct dropbear_ecc_curve *curve = NULL;
+#if DROPBEAR_ECDSA
+	if (key->type == OSSH_EC) {
+		unsigned char* private_key_bytes = NULL;
+		int private_key_len = 0;
+		unsigned char* public_key_bytes = NULL;
+		int public_key_len = 0;
+		ecc_key *ecc = NULL;
+		const struct dropbear_ecc_curve *curve = NULL;
 
-				/* See SEC1 v2, Appendix C.4 */
-				/* OpenSSL (so OpenSSH) seems to include the optional parts. */
+		/* See SEC1 v2, Appendix C.4 */
+		/* OpenSSL (so OpenSSH) seems to include the optional parts. */
 
-				/* privateKey OCTET STRING, */
-				ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
-														  &id, &len, &flags);
-				p += ret;
-				/* id==4 for octet string */
+		/* privateKey OCTET STRING, */
+		ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
+							  &id, &len, &flags);
+		p += ret;
+		/* id==4 for octet string */
 				if (ret < 0 || id != 4 || len < 0 ||
-						key->keyblob+key->keyblob_len-p < len) {
-						errmsg = "ASN.1 decoding failure";
-						goto error;
-				}
-				private_key_bytes = p;
-				private_key_len = len;
-				p += len;
+			key->keyblob+key->keyblob_len-p < len) {
+			errmsg = "ASN.1 decoding failure";
+			goto error;
+		}
+		private_key_bytes = p;
+		private_key_len = len;
+		p += len;
 
-				/* parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, */
-				ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
-														  &id, &len, &flags);
-				p += ret;
-				/* id==0 */
+		/* parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, */
+		ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
+							  &id, &len, &flags);
+		p += ret;
+		/* id==0 */
 				if (ret < 0 || id != 0 || len < 0) {
-						errmsg = "ASN.1 decoding failure";
-						goto error;
-				}
+			errmsg = "ASN.1 decoding failure";
+			goto error;
+		}
 
-				ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
-														  &id, &len, &flags);
-				p += ret;
-				/* id==6 for object */
+		ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
+							  &id, &len, &flags);
+		p += ret;
+		/* id==6 for object */
 				if (ret < 0 || id != 6 || len < 0 ||
-						key->keyblob+key->keyblob_len-p < len) {
-						errmsg = "ASN.1 decoding failure";
-						goto error;
-				}
+			key->keyblob+key->keyblob_len-p < len) {
+			errmsg = "ASN.1 decoding failure";
+			goto error;
+		}
 
-				if (0) {}
-#ifdef DROPBEAR_ECC_256
-				else if (len == sizeof(OID_SEC256R1_BLOB) 
-						&& memcmp(p, OID_SEC256R1_BLOB, len) == 0) {
-						retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
-						curve = &ecc_curve_nistp256;
-				} 
+		if (0) {}
+#if DROPBEAR_ECC_256
+		else if (len == sizeof(OID_SEC256R1_BLOB) 
+			&& memcmp(p, OID_SEC256R1_BLOB, len) == 0) {
+			retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
+			curve = &ecc_curve_nistp256;
+		} 
 #endif
-#ifdef DROPBEAR_ECC_384
-				else if (len == sizeof(OID_SEC384R1_BLOB)
-						&& memcmp(p, OID_SEC384R1_BLOB, len) == 0) {
-						retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP384;
-						curve = &ecc_curve_nistp384;
-				} 
+#if DROPBEAR_ECC_384
+		else if (len == sizeof(OID_SEC384R1_BLOB)
+			&& memcmp(p, OID_SEC384R1_BLOB, len) == 0) {
+			retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP384;
+			curve = &ecc_curve_nistp384;
+		} 
 #endif
-#ifdef DROPBEAR_ECC_521
-				else if (len == sizeof(OID_SEC521R1_BLOB)
-						&& memcmp(p, OID_SEC521R1_BLOB, len) == 0) {
-						retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP521;
-						curve = &ecc_curve_nistp521;
-				} 
+#if DROPBEAR_ECC_521
+		else if (len == sizeof(OID_SEC521R1_BLOB)
+			&& memcmp(p, OID_SEC521R1_BLOB, len) == 0) {
+			retkey->type = DROPBEAR_SIGNKEY_ECDSA_NISTP521;
+			curve = &ecc_curve_nistp521;
+		} 
 #endif
-				else {
-						errmsg = "Unknown ECC key type";
-						goto error;
-				}
-				p += len;
+		else {
+			errmsg = "Unknown ECC key type";
+			goto error;
+		}
+		p += len;
 
-				/* publicKey [1] BIT STRING OPTIONAL */
-				ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
-														  &id, &len, &flags);
-				p += ret;
-				/* id==1 */
+		/* publicKey [1] BIT STRING OPTIONAL */
+		ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
+							  &id, &len, &flags);
+		p += ret;
+		/* id==1 */
 				if (ret < 0 || id != 1 || len < 0) {
-						errmsg = "ASN.1 decoding failure";
-						goto error;
-				}
+			errmsg = "ASN.1 decoding failure";
+			goto error;
+		}
 
-				ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
-														  &id, &len, &flags);
-				p += ret;
-				/* id==3 for bit string */
+		ret = ber_read_id_len(p, key->keyblob+key->keyblob_len-p,
+							  &id, &len, &flags);
+		p += ret;
+		/* id==3 for bit string */
 				if (ret < 0 || id != 3 || len < 0 ||
-						key->keyblob+key->keyblob_len-p < len) {
-						errmsg = "ASN.1 decoding failure";
-						goto error;
-				}
-				public_key_bytes = p+1;
-				public_key_len = len-1;
-				p += len;
+			key->keyblob+key->keyblob_len-p < len) {
+			errmsg = "ASN.1 decoding failure";
+			goto error;
+		}
+		public_key_bytes = p+1;
+		public_key_len = len-1;
+		p += len;
 
-				buf_putbytes(blobbuf, public_key_bytes, public_key_len);
-				ecc = buf_get_ecc_raw_pubkey(blobbuf, curve);
-				if (!ecc) {
-						errmsg = "Error parsing ECC key";
-						goto error;
-				}
-				m_mp_alloc_init_multi((mp_int**)&ecc->k, NULL);
-				if (mp_read_unsigned_bin(ecc->k, private_key_bytes, private_key_len)
-						!= MP_OKAY) {
-						errmsg = "Error parsing ECC key";
-						goto error;
-				}
+		buf_putbytes(blobbuf, public_key_bytes, public_key_len);
+		ecc = buf_get_ecc_raw_pubkey(blobbuf, curve);
+		if (!ecc) {
+			errmsg = "Error parsing ECC key";
+			goto error;
+		}
+		m_mp_alloc_init_multi((mp_int**)&ecc->k, NULL);
+		if (mp_read_unsigned_bin(ecc->k, private_key_bytes, private_key_len)
+			!= MP_OKAY) {
+			errmsg = "Error parsing ECC key";
+			goto error;
+		}
 
-				*signkey_key_ptr(retkey, retkey->type) = ecc;
-		}
+		*signkey_key_ptr(retkey, retkey->type) = ecc;
+	}
 #endif /* DROPBEAR_ECDSA */
 
 	/*
@@ -795,19 +797,19 @@
 	 * functions; this is a bit faffy but it does mean we get all
 	 * the sanity checks for free.
 	 */
-		if (key->type == OSSH_RSA || key->type == OSSH_DSA) {
-				buf_setpos(blobbuf, 0);
-				type = DROPBEAR_SIGNKEY_ANY;
-				if (buf_get_priv_key(blobbuf, retkey, &type)
-								!= DROPBEAR_SUCCESS) {
-						errmsg = "unable to create key structure";
-						sign_key_free(retkey);
-						retkey = NULL;
-		goto error;
+	if (key->type == OSSH_RSA || key->type == OSSH_DSA) {
+		buf_setpos(blobbuf, 0);
+		type = DROPBEAR_SIGNKEY_ANY;
+		if (buf_get_priv_key(blobbuf, retkey, &type)
+				!= DROPBEAR_SUCCESS) {
+			errmsg = "unable to create key structure";
+			sign_key_free(retkey);
+			retkey = NULL;
+			goto error;
+		}
 	}
-		}
 
-	errmsg = NULL;                     /* no error */
+	errmsg = NULL;					 /* no error */
 	retval = retkey;
 
 	error:
@@ -828,301 +830,301 @@
 static int openssh_write(const char *filename, sign_key *key,
 				  char *passphrase)
 {
-		buffer * keyblob = NULL;
-		buffer * extrablob = NULL; /* used for calculated values to write */
-		unsigned char *outblob = NULL;
-		int outlen = -9999;
+	buffer * keyblob = NULL;
+	buffer * extrablob = NULL; /* used for calculated values to write */
+	unsigned char *outblob = NULL;
+	int outlen = -9999;
 	struct mpint_pos numbers[9];
-		int nnumbers = -1, pos = 0, len = 0, seqlen, i;
-		char *header = NULL, *footer = NULL;
+	int nnumbers = -1, pos = 0, len = 0, seqlen, i;
+	char *header = NULL, *footer = NULL;
 	char zero[1];
 	int ret = 0;
 	FILE *fp;
 
-#ifdef DROPBEAR_RSA
-		mp_int dmp1, dmq1, iqmp, tmpval; /* for rsa */
+#if DROPBEAR_RSA
+	mp_int dmp1, dmq1, iqmp, tmpval; /* for rsa */
 #endif
 
-		if (
-#ifdef DROPBEAR_RSA
-						key->type == DROPBEAR_SIGNKEY_RSA ||
+	if (
+#if DROPBEAR_RSA
+			key->type == DROPBEAR_SIGNKEY_RSA ||
 #endif
-#ifdef DROPBEAR_DSS
-						key->type == DROPBEAR_SIGNKEY_DSS ||
+#if DROPBEAR_DSS
+			key->type == DROPBEAR_SIGNKEY_DSS ||
 #endif
-						0)
-		{
-	/*
-	 * Fetch the key blobs.
-	 */
-				keyblob = buf_new(3000);
-				buf_put_priv_key(keyblob, key, key->type);
+			0)
+	{
+		/*
+		 * Fetch the key blobs.
+		 */
+		keyblob = buf_new(3000);
+		buf_put_priv_key(keyblob, key, key->type);
 
-				buf_setpos(keyblob, 0);
-				/* skip the "ssh-rsa" or "ssh-dss" header */
-				buf_incrpos(keyblob, buf_getint(keyblob));
+		buf_setpos(keyblob, 0);
+		/* skip the "ssh-rsa" or "ssh-dss" header */
+		buf_incrpos(keyblob, buf_getint(keyblob));
 
-	/*
-	 * Find the sequence of integers to be encoded into the OpenSSH
-	 * key blob, and also decide on the header line.
-	 */
-				numbers[0].start = zero; numbers[0].bytes = 1; zero[0] = '\0';
+		/*
+		 * Find the sequence of integers to be encoded into the OpenSSH
+		 * key blob, and also decide on the header line.
+		 */
+		numbers[0].start = zero; numbers[0].bytes = 1; zero[0] = '\0';
 
-		#ifdef DROPBEAR_RSA
-				if (key->type == DROPBEAR_SIGNKEY_RSA) {
+	#ifdef DROPBEAR_RSA
+		if (key->type == DROPBEAR_SIGNKEY_RSA) {
 
-						if (key->rsakey->p == NULL || key->rsakey->q == NULL) {
-								fprintf(stderr, "Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
-								goto error;
-						}
-
-						/* e */
-						numbers[2].bytes = buf_getint(keyblob);
-						numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
-						buf_incrpos(keyblob, numbers[2].bytes);
-
-						/* n */
-						numbers[1].bytes = buf_getint(keyblob);
-						numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
-						buf_incrpos(keyblob, numbers[1].bytes);
+			if (key->rsakey->p == NULL || key->rsakey->q == NULL) {
+				fprintf(stderr, "Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
+				goto error;
+			}
 
-						/* d */
-						numbers[3].bytes = buf_getint(keyblob);
-						numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
-						buf_incrpos(keyblob, numbers[3].bytes);
+			/* e */
+			numbers[2].bytes = buf_getint(keyblob);
+			numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
+			buf_incrpos(keyblob, numbers[2].bytes);
+			
+			/* n */
+			numbers[1].bytes = buf_getint(keyblob);
+			numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
+			buf_incrpos(keyblob, numbers[1].bytes);
+			
+			/* d */
+			numbers[3].bytes = buf_getint(keyblob);
+			numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
+			buf_incrpos(keyblob, numbers[3].bytes);
+			
+			/* p */
+			numbers[4].bytes = buf_getint(keyblob);
+			numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
+			buf_incrpos(keyblob, numbers[4].bytes);
+			
+			/* q */
+			numbers[5].bytes = buf_getint(keyblob);
+			numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
+			buf_incrpos(keyblob, numbers[5].bytes);
 
-						/* p */
-						numbers[4].bytes = buf_getint(keyblob);
-						numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
-						buf_incrpos(keyblob, numbers[4].bytes);
-						
-						/* q */
-						numbers[5].bytes = buf_getint(keyblob);
-						numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
-						buf_incrpos(keyblob, numbers[5].bytes);
-
-						/* now calculate some extra parameters: */
-						m_mp_init(&tmpval);
-						m_mp_init(&dmp1);
-						m_mp_init(&dmq1);
-						m_mp_init(&iqmp);
+			/* now calculate some extra parameters: */
+			m_mp_init(&tmpval);
+			m_mp_init(&dmp1);
+			m_mp_init(&dmq1);
+			m_mp_init(&iqmp);
 
-						/* dmp1 = d mod (p-1) */
-						if (mp_sub_d(key->rsakey->p, 1, &tmpval) != MP_OKAY) {
-								fprintf(stderr, "Bignum error for p-1\n");
-								goto error;
-						}
-						if (mp_mod(key->rsakey->d, &tmpval, &dmp1) != MP_OKAY) {
-								fprintf(stderr, "Bignum error for dmp1\n");
-								goto error;
-						}
+			/* dmp1 = d mod (p-1) */
+			if (mp_sub_d(key->rsakey->p, 1, &tmpval) != MP_OKAY) {
+				fprintf(stderr, "Bignum error for p-1\n");
+				goto error;
+			}
+			if (mp_mod(key->rsakey->d, &tmpval, &dmp1) != MP_OKAY) {
+				fprintf(stderr, "Bignum error for dmp1\n");
+				goto error;
+			}
 
-						/* dmq1 = d mod (q-1) */
-						if (mp_sub_d(key->rsakey->q, 1, &tmpval) != MP_OKAY) {
-								fprintf(stderr, "Bignum error for q-1\n");
-								goto error;
-						}
-						if (mp_mod(key->rsakey->d, &tmpval, &dmq1) != MP_OKAY) {
-								fprintf(stderr, "Bignum error for dmq1\n");
-								goto error;
-						}
+			/* dmq1 = d mod (q-1) */
+			if (mp_sub_d(key->rsakey->q, 1, &tmpval) != MP_OKAY) {
+				fprintf(stderr, "Bignum error for q-1\n");
+				goto error;
+			}
+			if (mp_mod(key->rsakey->d, &tmpval, &dmq1) != MP_OKAY) {
+				fprintf(stderr, "Bignum error for dmq1\n");
+				goto error;
+			}
 
-						/* iqmp = (q^-1) mod p */
-						if (mp_invmod(key->rsakey->q, key->rsakey->p, &iqmp) != MP_OKAY) {
-								fprintf(stderr, "Bignum error for iqmp\n");
-								goto error;
-						}
+			/* iqmp = (q^-1) mod p */
+			if (mp_invmod(key->rsakey->q, key->rsakey->p, &iqmp) != MP_OKAY) {
+				fprintf(stderr, "Bignum error for iqmp\n");
+				goto error;
+			}
 
-						extrablob = buf_new(2000);
-						buf_putmpint(extrablob, &dmp1);
-						buf_putmpint(extrablob, &dmq1);
-						buf_putmpint(extrablob, &iqmp);
-						buf_setpos(extrablob, 0);
-						mp_clear(&dmp1);
-						mp_clear(&dmq1);
-						mp_clear(&iqmp);
-						mp_clear(&tmpval);
-						
-						/* dmp1 */
-						numbers[6].bytes = buf_getint(extrablob);
-						numbers[6].start = buf_getptr(extrablob, numbers[6].bytes);
-						buf_incrpos(extrablob, numbers[6].bytes);
-						
-						/* dmq1 */
-						numbers[7].bytes = buf_getint(extrablob);
-						numbers[7].start = buf_getptr(extrablob, numbers[7].bytes);
-						buf_incrpos(extrablob, numbers[7].bytes);
-						
-						/* iqmp */
-						numbers[8].bytes = buf_getint(extrablob);
-						numbers[8].start = buf_getptr(extrablob, numbers[8].bytes);
-						buf_incrpos(extrablob, numbers[8].bytes);
+			extrablob = buf_new(2000);
+			buf_putmpint(extrablob, &dmp1);
+			buf_putmpint(extrablob, &dmq1);
+			buf_putmpint(extrablob, &iqmp);
+			buf_setpos(extrablob, 0);
+			mp_clear(&dmp1);
+			mp_clear(&dmq1);
+			mp_clear(&iqmp);
+			mp_clear(&tmpval);
+			
+			/* dmp1 */
+			numbers[6].bytes = buf_getint(extrablob);
+			numbers[6].start = buf_getptr(extrablob, numbers[6].bytes);
+			buf_incrpos(extrablob, numbers[6].bytes);
+			
+			/* dmq1 */
+			numbers[7].bytes = buf_getint(extrablob);
+			numbers[7].start = buf_getptr(extrablob, numbers[7].bytes);
+			buf_incrpos(extrablob, numbers[7].bytes);
+			
+			/* iqmp */
+			numbers[8].bytes = buf_getint(extrablob);
+			numbers[8].start = buf_getptr(extrablob, numbers[8].bytes);
+			buf_incrpos(extrablob, numbers[8].bytes);
 
-		nnumbers = 9;
-		header = "-----BEGIN RSA PRIVATE KEY-----\n";
-		footer = "-----END RSA PRIVATE KEY-----\n";
-				}
-		#endif /* DROPBEAR_RSA */
+			nnumbers = 9;
+			header = "-----BEGIN RSA PRIVATE KEY-----\n";
+			footer = "-----END RSA PRIVATE KEY-----\n";
+		}
+	#endif /* DROPBEAR_RSA */
 
-		#ifdef DROPBEAR_DSS
-				if (key->type == DROPBEAR_SIGNKEY_DSS) {
+	#ifdef DROPBEAR_DSS
+		if (key->type == DROPBEAR_SIGNKEY_DSS) {
 
-						/* p */
-						numbers[1].bytes = buf_getint(keyblob);
-						numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
-						buf_incrpos(keyblob, numbers[1].bytes);
+			/* p */
+			numbers[1].bytes = buf_getint(keyblob);
+			numbers[1].start = buf_getptr(keyblob, numbers[1].bytes);
+			buf_incrpos(keyblob, numbers[1].bytes);
 
-						/* q */
-						numbers[2].bytes = buf_getint(keyblob);
-						numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
-						buf_incrpos(keyblob, numbers[2].bytes);
+			/* q */
+			numbers[2].bytes = buf_getint(keyblob);
+			numbers[2].start = buf_getptr(keyblob, numbers[2].bytes);
+			buf_incrpos(keyblob, numbers[2].bytes);
 
-						/* g */
-						numbers[3].bytes = buf_getint(keyblob);
-						numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
-						buf_incrpos(keyblob, numbers[3].bytes);
+			/* g */
+			numbers[3].bytes = buf_getint(keyblob);
+			numbers[3].start = buf_getptr(keyblob, numbers[3].bytes);
+			buf_incrpos(keyblob, numbers[3].bytes);
 
-						/* y */
-						numbers[4].bytes = buf_getint(keyblob);
-						numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
-						buf_incrpos(keyblob, numbers[4].bytes);
+			/* y */
+			numbers[4].bytes = buf_getint(keyblob);
+			numbers[4].start = buf_getptr(keyblob, numbers[4].bytes);
+			buf_incrpos(keyblob, numbers[4].bytes);
 
-						/* x */
-						numbers[5].bytes = buf_getint(keyblob);
-						numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
-						buf_incrpos(keyblob, numbers[5].bytes);
+			/* x */
+			numbers[5].bytes = buf_getint(keyblob);
+			numbers[5].start = buf_getptr(keyblob, numbers[5].bytes);
+			buf_incrpos(keyblob, numbers[5].bytes);
 
-		nnumbers = 6;
-		header = "-----BEGIN DSA PRIVATE KEY-----\n";
-		footer = "-----END DSA PRIVATE KEY-----\n";
-	}
-		#endif /* DROPBEAR_DSS */
+			nnumbers = 6;
+			header = "-----BEGIN DSA PRIVATE KEY-----\n";
+			footer = "-----END DSA PRIVATE KEY-----\n";
+		}
+	#endif /* DROPBEAR_DSS */
 
-	/*
-	 * Now count up the total size of the ASN.1 encoded integers,
-	 * so as to determine the length of the containing SEQUENCE.
-	 */
-	len = 0;
-	for (i = 0; i < nnumbers; i++) {
-		len += ber_write_id_len(NULL, 2, numbers[i].bytes, 0);
-		len += numbers[i].bytes;
-	}
-	seqlen = len;
-	/* Now add on the SEQUENCE header. */
-	len += ber_write_id_len(NULL, 16, seqlen, ASN1_CONSTRUCTED);
-	/* Round up to the cipher block size, ensuring we have at least one
-	 * byte of padding (see below). */
-	outlen = len;
-	if (passphrase)
-		outlen = (outlen+8) &~ 7;
+		/*
+		 * Now count up the total size of the ASN.1 encoded integers,
+		 * so as to determine the length of the containing SEQUENCE.
+		 */
+		len = 0;
+		for (i = 0; i < nnumbers; i++) {
+			len += ber_write_id_len(NULL, 2, numbers[i].bytes, 0);
+			len += numbers[i].bytes;
+		}
+		seqlen = len;
+		/* Now add on the SEQUENCE header. */
+		len += ber_write_id_len(NULL, 16, seqlen, ASN1_CONSTRUCTED);
+		/* Round up to the cipher block size, ensuring we have at least one
+		 * byte of padding (see below). */
+		outlen = len;
+		if (passphrase)
+			outlen = (outlen+8) &~ 7;
 
-	/*
-	 * Now we know how big outblob needs to be. Allocate it.
-	 */
-				outblob = (unsigned char*)m_malloc(outlen);
+		/*
+		 * Now we know how big outblob needs to be. Allocate it.
+		 */
+		outblob = (unsigned char*)m_malloc(outlen);
 
-	/*
-	 * And write the data into it.
-	 */
-	pos = 0;
-	pos += ber_write_id_len(outblob+pos, 16, seqlen, ASN1_CONSTRUCTED);
-	for (i = 0; i < nnumbers; i++) {
-		pos += ber_write_id_len(outblob+pos, 2, numbers[i].bytes, 0);
-		memcpy(outblob+pos, numbers[i].start, numbers[i].bytes);
-		pos += numbers[i].bytes;
-	}
-		} /* end RSA and DSS handling */
+		/*
+		 * And write the data into it.
+		 */
+		pos = 0;
+		pos += ber_write_id_len(outblob+pos, 16, seqlen, ASN1_CONSTRUCTED);
+		for (i = 0; i < nnumbers; i++) {
+			pos += ber_write_id_len(outblob+pos, 2, numbers[i].bytes, 0);
+			memcpy(outblob+pos, numbers[i].start, numbers[i].bytes);
+			pos += numbers[i].bytes;
+		}
+	} /* end RSA and DSS handling */
 
-#ifdef DROPBEAR_ECDSA
-		if (key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
-				|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
-				|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) {
+#if DROPBEAR_ECDSA
+	if (key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP256
+		|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP384
+		|| key->type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) {
 
-				/*  SEC1 V2 appendix c.4
-				ECPrivateKey ::= SEQUENCE {
-						version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
-						privateKey OCTET STRING,
-						parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, 
-						publicKey [1] BIT STRING OPTIONAL
-				}
-				*/
-				buffer *seq_buf = buf_new(400);
-				ecc_key **eck = (ecc_key**)signkey_key_ptr(key, key->type);
-				const long curve_size = (*eck)->dp->size;
-				int curve_oid_len = 0;
-				const void* curve_oid = NULL;
-				unsigned long pubkey_size = 2*curve_size+1;
-				int k_size;
-				int err = 0;
+		/*  SEC1 V2 appendix c.4
+		ECPrivateKey ::= SEQUENCE {
+			version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
+			privateKey OCTET STRING,
+			parameters [0] ECDomainParameters {{ SECGCurveNames }} OPTIONAL, 
+			publicKey [1] BIT STRING OPTIONAL
+		}
+		*/
+		buffer *seq_buf = buf_new(400);
+		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, key->type);
+		const long curve_size = (*eck)->dp->size;
+		int curve_oid_len = 0;
+		const void* curve_oid = NULL;
+		unsigned long pubkey_size = 2*curve_size+1;
+		int k_size;
+		int err = 0;
 
-				/* version. less than 10 bytes */
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 2, 1, 0));
-				buf_putbyte(seq_buf, 1);
+		/* version. less than 10 bytes */
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 2, 1, 0));
+		buf_putbyte(seq_buf, 1);
 
-				/* privateKey */
-				k_size = mp_unsigned_bin_size((*eck)->k);
-				dropbear_assert(k_size <= curve_size);
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 4, k_size, 0));
-				mp_to_unsigned_bin((*eck)->k, buf_getwriteptr(seq_buf, k_size));
-				buf_incrwritepos(seq_buf, k_size);
+		/* privateKey */
+		k_size = mp_unsigned_bin_size((*eck)->k);
+		dropbear_assert(k_size <= curve_size);
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 4, k_size, 0));
+		mp_to_unsigned_bin((*eck)->k, buf_getwriteptr(seq_buf, k_size));
+		buf_incrwritepos(seq_buf, k_size);
 
-				/* SECGCurveNames */
-				switch (key->type)
-				{
-						case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
-								curve_oid_len = sizeof(OID_SEC256R1_BLOB);
-								curve_oid = OID_SEC256R1_BLOB;
-								break;
-						case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
-								curve_oid_len = sizeof(OID_SEC384R1_BLOB);
-								curve_oid = OID_SEC384R1_BLOB;
-								break;
-						case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
-								curve_oid_len = sizeof(OID_SEC521R1_BLOB);
-								curve_oid = OID_SEC521R1_BLOB;
-								break;
-						default:
-								dropbear_exit("Internal error");
-				}
+		/* SECGCurveNames */
+		switch (key->type)
+		{
+			case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
+				curve_oid_len = sizeof(OID_SEC256R1_BLOB);
+				curve_oid = OID_SEC256R1_BLOB;
+				break;
+			case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
+				curve_oid_len = sizeof(OID_SEC384R1_BLOB);
+				curve_oid = OID_SEC384R1_BLOB;
+				break;
+			case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
+				curve_oid_len = sizeof(OID_SEC521R1_BLOB);
+				curve_oid = OID_SEC521R1_BLOB;
+				break;
+			default:
+				dropbear_exit("Internal error");
+		}
 
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 0, 2+curve_oid_len, 0xa0));
-				/* object == 6 */
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 6, curve_oid_len, 0));
-				buf_putbytes(seq_buf, curve_oid, curve_oid_len);
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 0, 2+curve_oid_len, 0xa0));
+		/* object == 6 */
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 6, curve_oid_len, 0));
+		buf_putbytes(seq_buf, curve_oid, curve_oid_len);
 
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 1, 2+1+pubkey_size, 0xa0));
-				buf_incrwritepos(seq_buf,
-						ber_write_id_len(buf_getwriteptr(seq_buf, 10), 3, 1+pubkey_size, 0));
-				buf_putbyte(seq_buf, 0);
-				err = ecc_ansi_x963_export(*eck, buf_getwriteptr(seq_buf, pubkey_size), &pubkey_size);
-				if (err != CRYPT_OK) {
-						dropbear_exit("ECC error");
-				}
-				buf_incrwritepos(seq_buf, pubkey_size);
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 1, 2+1+pubkey_size, 0xa0));
+		buf_incrwritepos(seq_buf,
+			ber_write_id_len(buf_getwriteptr(seq_buf, 10), 3, 1+pubkey_size, 0));
+		buf_putbyte(seq_buf, 0);
+		err = ecc_ansi_x963_export(*eck, buf_getwriteptr(seq_buf, pubkey_size), &pubkey_size);
+		if (err != CRYPT_OK) {
+			dropbear_exit("ECC error");
+		}
+		buf_incrwritepos(seq_buf, pubkey_size);
 
-				buf_setpos(seq_buf, 0);
-						
-				outblob = (unsigned char*)m_malloc(1000);
+		buf_setpos(seq_buf, 0);
+			
+		outblob = (unsigned char*)m_malloc(1000);
 
-				pos = 0;
-				pos += ber_write_id_len(outblob+pos, 16, seq_buf->len, ASN1_CONSTRUCTED);
-				memcpy(&outblob[pos], seq_buf->data, seq_buf->len);
-				pos += seq_buf->len;
-				len = pos;
-				outlen = len;
+		pos = 0;
+		pos += ber_write_id_len(outblob+pos, 16, seq_buf->len, ASN1_CONSTRUCTED);
+		memcpy(&outblob[pos], seq_buf->data, seq_buf->len);
+		pos += seq_buf->len;
+		len = pos;
+		outlen = len;
 
-				buf_burn(seq_buf);
-				buf_free(seq_buf);
-				seq_buf = NULL;
+		buf_burn(seq_buf);
+		buf_free(seq_buf);
+		seq_buf = NULL;
 
-				header = "-----BEGIN EC PRIVATE KEY-----\n";
-				footer = "-----END EC PRIVATE KEY-----\n";
-		}
+		header = "-----BEGIN EC PRIVATE KEY-----\n";
+		footer = "-----END EC PRIVATE KEY-----\n";
+	}
 #endif
 
 	/*
@@ -1142,7 +1144,7 @@
 	 * with the same value. Those are all removed and the rest is
 	 * returned.
 	 */
-		dropbear_assert(pos == len);
+	dropbear_assert(pos == len);
 	while (pos < outlen) {
 		outblob[pos++] = outlen - len;
 	}
@@ -1151,25 +1153,25 @@
 	 * Encrypt the key.
 	 */
 	if (passphrase) {
-				fprintf(stderr, "Encrypted keys aren't supported currently\n");
-				goto error;
+		fprintf(stderr, "Encrypted keys aren't supported currently\n");
+		goto error;
 	}
 
 	/*
 	 * And save it. We'll use Unix line endings just in case it's
 	 * subsequently transferred in binary mode.
 	 */
-		if (strlen(filename) == 1 && filename[0] == '-') {
-				fp = stdout;
-		} else {
-				fp = fopen(filename, "wb");       /* ensure Unix line endings */
-		}
-		if (!fp) {
-				fprintf(stderr, "Failed opening output file\n");
+	if (strlen(filename) == 1 && filename[0] == '-') {
+		fp = stdout;
+	} else {
+		fp = fopen(filename, "wb");	  /* ensure Unix line endings */
+	}
+	if (!fp) {
+		fprintf(stderr, "Failed opening output file\n");
 		goto error;
-		}
+	}
 	fputs(header, fp);
-		base64_encode_fp(fp, outblob, outlen, 64);
+	base64_encode_fp(fp, outblob, outlen, 64);
 	fputs(footer, fp);
 	fclose(fp);
 	ret = 1;
@@ -1205,10 +1207,10 @@
  * 
  * So. The blob contains:
  * 
- *  - uint32 0x3f6ff9eb       (magic number)
- *  - uint32 size             (total blob size)
- *  - string key-type         (see below)
- *  - string cipher-type      (tells you if key is encrypted)
+ *  - uint32 0x3f6ff9eb	   (magic number)
+ *  - uint32 size			 (total blob size)
+ *  - string key-type		 (see below)
+ *  - string cipher-type	  (tells you if key is encrypted)
  *  - string encrypted-blob
  * 
  * (The first size field includes the size field itself and the
@@ -1264,13 +1266,13 @@
  *  - first 16 bytes are MD5(passphrase)
  *  - next 16 bytes are MD5(passphrase || first 16 bytes)
  *  - if there were more, they'd be MD5(passphrase || first 32),
- *    and so on.
+ *	and so on.
  */
 
 #define SSHCOM_MAGIC_NUMBER 0x3f6ff9eb
 
 struct sshcom_key {
-	char comment[256];                 /* allowing any length is overkill */
+	char comment[256];				 /* allowing any length is overkill */
 	unsigned char *keyblob;
 	int keyblob_len, keyblob_size;
 };
@@ -1291,7 +1293,7 @@
 	ret->keyblob = NULL;
 	ret->keyblob_len = ret->keyblob_size = 0;
 
-		fp = fopen(filename, "r");
+	fp = fopen(filename, "r");
 	if (!fp) {
 		errmsg = "Unable to open key file";
 		goto error;
@@ -1309,7 +1311,7 @@
 			goto error;
 		}
 		if (!strcmp(buffer, "---- END SSH2 ENCRYPTED PRIVATE KEY ----\n"))
-			break;                     /* done */
+			break;					 /* done */
 		if ((p = strchr(buffer, ':')) != NULL) {
 			if (headers_done) {
 				errmsg = "Header found in body of key data";
@@ -1386,10 +1388,10 @@
 	if (ret) {
 		if (ret->keyblob) {
 			memset(ret->keyblob, 0, ret->keyblob_size);
-						m_free(ret->keyblob);
+			m_free(ret->keyblob);
 		}
 		memset(ret, 0, sizeof(*ret));
-				m_free(ret);
+		m_free(ret);
 	}
 	return NULL;
 }
@@ -1407,7 +1409,7 @@
 	 * Check magic number.
 	 */
 	if (GET_32BIT(key->keyblob) != 0x3f6ff9eb)
-		return 0;                      /* key is invalid */
+		return 0;					  /* key is invalid */
 
 	/*
 	 * Find the cipher-type string.
@@ -1415,23 +1417,23 @@
 	answer = 0;
 	pos = 8;
 	if (key->keyblob_len < pos+4)
-		goto done;                     /* key is far too short */
+		goto done;					 /* key is far too short */
 	len = toint(GET_32BIT(key->keyblob + pos));
 	if (len < 0 || len > key->keyblob_len - pos - 4)
-		goto done;                     /* key is far too short */
+		goto done;					 /* key is far too short */
 	pos += 4 + len;                    /* skip key type */
 	len = toint(GET_32BIT(key->keyblob + pos)); /* find cipher-type length */
 	if (len < 0 || len > key->keyblob_len - pos - 4)
-		goto done;                     /* cipher type string is incomplete */
+		goto done;					 /* cipher type string is incomplete */
 	if (len != 4 || 0 != memcmp(key->keyblob + pos + 4, "none", 4))
 		answer = 1;
 
 	done:
 	*comment = dupstr(key->comment);
 	memset(key->keyblob, 0, key->keyblob_size);
-		m_free(key->keyblob);
+	m_free(key->keyblob);
 	memset(key, 0, sizeof(*key));
-		m_free(key);
+	m_free(key);
 	return answer;
 }
 
@@ -1455,7 +1457,7 @@
 	error:
 	ret->start = NULL;
 	ret->bytes = -1;
-	return len;                        /* ensure further calls fail as well */
+	return len;						/* ensure further calls fail as well */
 }
 
 static int sshcom_put_mpint(void *target, void *data, int len)
@@ -1681,13 +1683,13 @@
 	} else
 		return NULL;
 
-		dropbear_assert(privlen > 0);                      /* should have bombed by now if not */
+	dropbear_assert(privlen > 0);			   /* should have bombed by now if not */
 
 	retkey = snew(struct ssh2_userkey);
 	retkey->alg = alg;
 	retkey->data = alg->createkey(blob, publen, blob+publen, privlen);
 	if (!retkey->data) {
-				m_free(retkey);
+		m_free(retkey);
 		errmsg = "unable to create key data structure";
 		goto error;
 	}
@@ -1699,12 +1701,12 @@
 	error:
 	if (blob) {
 		memset(blob, 0, blobsize);
-				m_free(blob);
+		m_free(blob);
 	}
 	memset(key->keyblob, 0, key->keyblob_size);
-		m_free(key->keyblob);
+	m_free(key->keyblob);
 	memset(key, 0, sizeof(*key));
-		m_free(key);
+	m_free(key);
 	return ret;
 }
 
@@ -1747,7 +1749,7 @@
 		pos += ssh2_read_mpint(privblob+pos, privlen-pos, &q);
 		pos += ssh2_read_mpint(privblob+pos, privlen-pos, &iqmp);
 
-				dropbear_assert(e.start && iqmp.start); /* can't go wrong */
+		dropbear_assert(e.start && iqmp.start); /* can't go wrong */
 
 		numbers[0] = e;
 		numbers[1] = d;
@@ -1771,7 +1773,7 @@
 		pos = 0;
 		pos += ssh2_read_mpint(privblob+pos, privlen-pos, &x);
 
-				dropbear_assert(y.start && x.start); /* can't go wrong */
+		dropbear_assert(y.start && x.start); /* can't go wrong */
 
 		numbers[0] = p;
 		numbers[1] = g;
@@ -1783,7 +1785,7 @@
 		initial_zero = 1;
 		type = "dl-modp{sign{dsa-nist-sha1},dh{plain}}";
 	} else {
-				dropbear_assert(0);                                      /* zoinks! */
+		dropbear_assert(0);					 /* zoinks! */
 	}
 
 	/*
@@ -1801,15 +1803,15 @@
 	 */
 	pos = 0;
 	PUT_32BIT(outblob+pos, SSHCOM_MAGIC_NUMBER); pos += 4;
-	pos += 4;                          /* length field, fill in later */
+	pos += 4;							   /* length field, fill in later */
 	pos += put_string(outblob+pos, type, strlen(type));
 	{
 		char *ciphertype = passphrase ? "3des-cbc" : "none";
 		pos += put_string(outblob+pos, ciphertype, strlen(ciphertype));
 	}
-	lenpos = pos;                      /* remember this position */
-	pos += 4;                          /* encrypted-blob size */
-	pos += 4;                          /* encrypted-payload size */
+	lenpos = pos;					   /* remember this position */
+	pos += 4;							   /* encrypted-blob size */
+	pos += 4;							   /* encrypted-payload size */
 	if (initial_zero) {
 		PUT_32BIT(outblob+pos, 0);
 		pos += 4;
@@ -1827,13 +1829,13 @@
 	}
 	ciphertext = (char *)outblob+lenpos+4;
 	cipherlen = pos - (lenpos+4);
-		dropbear_assert(!passphrase || cipherlen % 8 == 0);
+	dropbear_assert(!passphrase || cipherlen % 8 == 0);
 	/* Wrap up the encrypted blob string. */
 	PUT_32BIT(outblob+lenpos, cipherlen);
 	/* And finally fill in the total length field. */
 	PUT_32BIT(outblob+4, pos);
 
-		dropbear_assert(pos < outlen);
+	dropbear_assert(pos < outlen);
 
 	/*
 	 * Encrypt the key.
@@ -1874,7 +1876,7 @@
 	 * And save it. We'll use Unix line endings just in case it's
 	 * subsequently transferred in binary mode.
 	 */
-		fp = fopen(filename, "wb");       /* ensure Unix line endings */
+	fp = fopen(filename, "wb");	  /* ensure Unix line endings */
 	if (!fp)
 		goto error;
 	fputs("---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----\n", fp);
@@ -1886,16 +1888,16 @@
 	 * Don't ask me, I didn't design it.
 	 */
 	{
-		int slen = 60;                 /* starts at 60 due to "Comment: " */
+		int slen = 60;					   /* starts at 60 due to "Comment: " */
 		char *c = key->comment;
 		while ((int)strlen(c) > slen) {
 			fprintf(fp, "%.*s\\\n", slen, c);
 			c += slen;
-			slen = 70;                 /* allow 70 chars on subsequent lines */
+			slen = 70;					   /* allow 70 chars on subsequent lines */
 		}
 		fprintf(fp, "%s\"\n", c);
 	}
-		base64_encode_fp(fp, outblob, pos, 70);
+	base64_encode_fp(fp, outblob, pos, 70);
 	fputs("---- END SSH2 ENCRYPTED PRIVATE KEY ----\n", fp);
 	fclose(fp);
 	ret = 1;
@@ -1903,15 +1905,15 @@
 	error:
 	if (outblob) {
 		memset(outblob, 0, outlen);
-				m_free(outblob);
+		m_free(outblob);
 	}
 	if (privblob) {
 		memset(privblob, 0, privlen);
-				m_free(privblob);
+		m_free(privblob);
 	}
 	if (pubblob) {
 		memset(pubblob, 0, publen);
-				m_free(pubblob);
+		m_free(pubblob);
 	}
 	return ret;
 }
--- a/libtomcrypt/Makefile.in	Thu May 18 23:38:30 2017 +0800
+++ b/libtomcrypt/Makefile.in	Thu May 18 23:45:10 2017 +0800
@@ -19,7 +19,7 @@
 
 # Compilation flags. Note the += does not write over the user's CFLAGS!
 # The rest of the flags come from the parent Dropbear makefile
-CFLAGS += -c -I$(srcdir)/src/headers/ -I$(srcdir)/../ -DLTC_SOURCE -I$(srcdir)/../libtommath/
+CFLAGS += -c -Isrc/headers/ -I$(srcdir)/src/headers/ -I../ -I$(srcdir)/../ -DLTC_SOURCE -I../libtommath/ -I$(srcdir)/../libtommath/
 
 # additional warnings (newer GCC 3.4 and higher)
 ifdef GCC_34
--- a/libtommath/Makefile.in	Thu May 18 23:38:30 2017 +0800
+++ b/libtommath/Makefile.in	Thu May 18 23:45:10 2017 +0800
@@ -9,7 +9,7 @@
 [email protected]@
 
 # So that libtommath can include Dropbear headers for options and m_burn()
-CFLAGS += -I$(srcdir)/../libtomcrypt/src/headers/ -I$(srcdir)/../
+CFLAGS += -I. -I$(srcdir) -I../libtomcrypt/src/headers/ -I$(srcdir)/../libtomcrypt/src/headers/ -I../ -I$(srcdir)/../
 
 ifndef IGNORE_SPEED
 
--- a/loginrec.c	Thu May 18 23:38:30 2017 +0800
+++ b/loginrec.c	Thu May 18 23:45:10 2017 +0800
@@ -706,7 +706,7 @@
 		}
 
 		(void)lseek(fd, (off_t)(tty * sizeof(struct utmp)), SEEK_SET);
-		if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut))
+		if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut))
 			dropbear_log(LOG_WARNING, "utmp_write_direct: error writing %s: %s",
 			    UTMP_FILE, strerror(errno));
 
@@ -895,7 +895,7 @@
 		return 0;
 	}
 	if (fstat(fd, &buf) == 0)
-		if (atomicio(write, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
+		if (atomicio(vwrite, fd, ut, sizeof(*ut)) != sizeof(*ut)) {
 			ftruncate(fd, buf.st_size);
 			dropbear_log(LOG_WARNING, "wtmp_write: problem writing %s: %s",
 			    WTMP_FILE, strerror(errno));
@@ -1062,7 +1062,7 @@
 	}
 
 	if (fstat(fd, &buf) == 0)
-		if (atomicio(write, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
+		if (atomicio(vwrite, fd, utx, sizeof(*utx)) != sizeof(*utx)) {
 			ftruncate(fd, buf.st_size);
 			dropbear_log(LOG_WARNING, "wtmpx_write: problem writing %s: %s",
 			    WTMPX_FILE, strerror(errno));
@@ -1351,7 +1351,7 @@
 		return(0);
 
 	/* write the entry */
-	if (atomicio(write, fd, &last, sizeof(last)) != sizeof(last)) {
+	if (atomicio(vwrite, fd, &last, sizeof(last)) != sizeof(last)) {
 		close(fd);
 		dropbear_log(LOG_WARNING, "lastlog_write_filemode: Error writing to %s: %s",
 		    LASTLOG_FILE, strerror(errno));
--- a/ltc_prng.c	Thu May 18 23:38:30 2017 +0800
+++ b/ltc_prng.c	Thu May 18 23:45:10 2017 +0800
@@ -26,7 +26,7 @@
  * in the various other functions.
  */
 
-#ifdef DROPBEAR_LTC_PRNG
+#if DROPBEAR_LTC_PRNG
 
 /**
   Start the PRNG
--- a/ltc_prng.h	Thu May 18 23:38:30 2017 +0800
+++ b/ltc_prng.h	Thu May 18 23:45:10 2017 +0800
@@ -4,7 +4,7 @@
 #include "options.h"
 #include "includes.h"
 
-#ifdef DROPBEAR_LTC_PRNG
+#if DROPBEAR_LTC_PRNG
 
 extern const struct ltc_prng_descriptor dropbear_prng_desc;
 
--- a/netio.c	Thu May 18 23:38:30 2017 +0800
+++ b/netio.c	Thu May 18 23:45:10 2017 +0800
@@ -53,7 +53,7 @@
 	struct addrinfo *r;
 	int res = 0;
 	int fastopen = 0;
-#ifdef DROPBEAR_CLIENT_TCP_FAST_OPEN
+#if DROPBEAR_CLIENT_TCP_FAST_OPEN
 	struct msghdr message;
 #endif
 
@@ -70,7 +70,7 @@
 		set_sock_nodelay(c->sock);
 		setnonblocking(c->sock);
 
-#ifdef DROPBEAR_CLIENT_TCP_FAST_OPEN
+#if DROPBEAR_CLIENT_TCP_FAST_OPEN
 		fastopen = (c->writequeue != NULL);
 
 		if (fastopen) {
@@ -290,7 +290,7 @@
 	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void*)&val, sizeof(val));
 }
 
-#ifdef DROPBEAR_SERVER_TCP_FAST_OPEN
+#if DROPBEAR_SERVER_TCP_FAST_OPEN
 void set_listen_fast_open(int sock) {
 	int qlen = MAX(MAX_UNAUTH_PER_IP, 5);
 	if (setsockopt(sock, SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen)) != 0) {
--- a/netio.h	Thu May 18 23:38:30 2017 +0800
+++ b/netio.h	Thu May 18 23:45:10 2017 +0800
@@ -48,7 +48,7 @@
 void packet_queue_to_iovec(struct Queue *queue, struct iovec *iov, unsigned int *iov_count);
 void packet_queue_consume(struct Queue *queue, ssize_t written);
 
-#ifdef DROPBEAR_SERVER_TCP_FAST_OPEN
+#if DROPBEAR_SERVER_TCP_FAST_OPEN
 /* Try for any Linux builds, will fall back if the kernel doesn't support it */
 void set_listen_fast_open(int sock);
 /* Define values which may be supported by the kernel even if the libc is too old */
--- a/options.h	Thu May 18 23:38:30 2017 +0800
+++ b/options.h	Thu May 18 23:45:10 2017 +0800
@@ -1,356 +1,19 @@
-/* Dropbear SSH
- * Copyright (c) 2002,2003 Matt Johnston
- * All rights reserved. See LICENSE for the license. */
-
-#ifndef DROPBEAR_OPTIONS_H_
-#define DROPBEAR_OPTIONS_H_
-
-/* Define compile-time options below - the "#ifndef DROPBEAR_XXX .... #endif"
- * parts are to allow for commandline -DDROPBEAR_XXX options etc. */
-
-/* IMPORTANT: Many options will require "make clean" after changes */
+#ifndef DROPBEAR_OPTIONS_H
+#define DROPBEAR_OPTIONS_H
 
-#ifndef DROPBEAR_DEFPORT
-#define DROPBEAR_DEFPORT "22"
-#endif
-
-#ifndef DROPBEAR_DEFADDRESS
-/* Listen on all interfaces */
-#define DROPBEAR_DEFADDRESS ""
-#endif
+/* 
+Local compile-time configuration should be defined in localoptions.h
+See default_options.h.in for a description of the available options.
+*/
 
-/* Default hostkey paths - these can be specified on the command line */
-#ifndef DSS_PRIV_FILENAME
-#define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
-#endif
-#ifndef RSA_PRIV_FILENAME
-#define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
-#endif
-#ifndef ECDSA_PRIV_FILENAME
-#define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
+#ifdef LOCALOPTIONS_H_EXISTS
+#include "localoptions.h"
 #endif
 
-/* Set NON_INETD_MODE if you require daemon functionality (ie Dropbear listens
- * on chosen ports and keeps accepting connections. This is the default.
- *
- * Set INETD_MODE if you want to be able to run Dropbear with inetd (or
- * similar), where it will use stdin/stdout for connections, and each process
- * lasts for a single connection. Dropbear should be invoked with the -i flag
- * for inetd, and can only accept IPv4 connections.
- *
- * Both of these flags can be defined at once, don't compile without at least
- * one of them. */
-#define NON_INETD_MODE
-#define INETD_MODE
-
-/* Setting this disables the fast exptmod bignum code. It saves ~5kB, but is
- * perhaps 20% slower for pubkey operations (it is probably worth experimenting
- * if you want to use this) */
-/*#define NO_FAST_EXPTMOD*/
-
-/* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
-several kB in binary size however will make the symmetrical ciphers and hashes
-slower, perhaps by 50%. Recommended for small systems that aren't doing
-much traffic. */
-#define DROPBEAR_SMALL_CODE
-
-/* Enable X11 Forwarding - server only */
-#define ENABLE_X11FWD
-
-/* Enable TCP Fowarding */
-/* 'Local' is "-L" style (client listening port forwarded via server)
- * 'Remote' is "-R" style (server listening port forwarded via client) */
-
-#define ENABLE_CLI_LOCALTCPFWD
-#define ENABLE_CLI_REMOTETCPFWD
-
-#define ENABLE_SVR_LOCALTCPFWD
-#define ENABLE_SVR_REMOTETCPFWD
-
-/* Enable Authentication Agent Forwarding */
-#define ENABLE_SVR_AGENTFWD
-#define ENABLE_CLI_AGENTFWD
-
-
-/* Note: Both ENABLE_CLI_PROXYCMD and ENABLE_CLI_NETCAT must be set to
- * allow multihop dbclient connections */
-
-/* Allow using -J <proxycommand> to run the connection through a 
-   pipe to a program, rather the normal TCP connection */
-#define ENABLE_CLI_PROXYCMD
-
-/* Enable "Netcat mode" option. This will forward standard input/output
- * to a remote TCP-forwarded connection */
-#define ENABLE_CLI_NETCAT
-
-/* Whether to support "-c" and "-m" flags to choose ciphers/MACs at runtime */
-#define ENABLE_USER_ALGO_LIST
-
-/* Encryption - at least one required.
- * Protocol RFC requires 3DES and recommends AES128 for interoperability.
- * Including multiple keysize variants the same cipher 
- * (eg AES256 as well as AES128) will result in a minimal size increase.*/
-#define DROPBEAR_AES128
-#define DROPBEAR_3DES
-#define DROPBEAR_AES256
-/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
-/*#define DROPBEAR_BLOWFISH*/
-#define DROPBEAR_TWOFISH256
-#define DROPBEAR_TWOFISH128
-
-/* Enable CBC mode for ciphers. This has security issues though
- * is the most compatible with older SSH implementations */
-#define DROPBEAR_ENABLE_CBC_MODE
-
-/* Enable "Counter Mode" for ciphers. This is more secure than normal
- * CBC mode against certain attacks. It is recommended for security
- * and forwards compatibility */
-#define DROPBEAR_ENABLE_CTR_MODE
-
-/* Twofish counter mode is disabled by default because it 
-has not been tested for interoperability with other SSH implementations.
-If you test it please contact the Dropbear author */
-/* #define DROPBEAR_TWOFISH_CTR */
-
-/* You can compile with no encryption if you want. In some circumstances
- * this could be safe security-wise, though make sure you know what
- * you're doing. Anyone can see everything that goes over the wire, so
- * the only safe auth method is public key. */
-/* #define DROPBEAR_NONE_CIPHER */
-
-/* Message Integrity - at least one required.
- * Protocol RFC requires sha1 and recommends sha1-96.
- * sha1-96 is of use for slow links as it has a smaller overhead.
- *
- * There's no reason to disable sha1 or sha1-96 to save space since it's
- * used for the random number generator and public-key cryptography anyway.
- * Disabling it here will just stop it from being used as the integrity portion
- * of the ssh protocol.
- *
- * These hashes are also used for public key fingerprints in logs.
- * If you disable MD5, Dropbear will fall back to SHA1 fingerprints,
- * which are not the standard form. */
-#define DROPBEAR_SHA1_HMAC
-#define DROPBEAR_SHA1_96_HMAC
-#define DROPBEAR_SHA2_256_HMAC
-#define DROPBEAR_SHA2_512_HMAC
-#define DROPBEAR_MD5_HMAC
-
-/* You can also disable integrity. Don't bother disabling this if you're
- * still using a cipher, it's relatively cheap. If you disable this it's dead
- * simple for an attacker to run arbitrary commands on the remote host. Beware. */
-/* #define DROPBEAR_NONE_INTEGRITY */
-
-/* Hostkey/public key algorithms - at least one required, these are used
- * for hostkey as well as for verifying signatures with pubkey auth.
- * Removing either of these won't save very much space.
- * SSH2 RFC Draft requires dss, recommends rsa */
-#define DROPBEAR_RSA
-#define DROPBEAR_DSS
-/* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
- * code (either ECDSA or ECDH) increases binary size - around 30kB
- * on x86-64 */
-#define DROPBEAR_ECDSA
-
-/* Generate hostkeys as-needed when the first connection using that key type occurs.
-   This avoids the need to otherwise run "dropbearkey" and avoids some problems
-   with badly seeded /dev/urandom when systems first boot.
-   This also requires a runtime flag "-R". This adds ~4kB to binary size (or hardly 
-   anything if dropbearkey is linked in a "dropbearmulti" binary) */
-#define DROPBEAR_DELAY_HOSTKEY
-
-/* Enable Curve25519 for key exchange. This is another elliptic
- * curve method with good security properties. Increases binary size
- * by ~8kB on x86-64 */
-#define DROPBEAR_CURVE25519
-
-/* Enable elliptic curve Diffie Hellman key exchange, see note about
- * ECDSA above */
-#define DROPBEAR_ECDH
-
-/* Group14 (2048 bit) is recommended. Group1 is less secure (1024 bit) though
-   is the only option for interoperability with some older SSH programs */
-#define DROPBEAR_DH_GROUP1 1
-#define DROPBEAR_DH_GROUP14 1
-
-/* Control the memory/performance/compression tradeoff for zlib.
- * Set windowBits=8 for least memory usage, see your system's
- * zlib.h for full details.
- * Default settings (windowBits=15) will use 256kB for compression
- * windowBits=8 will use 129kB for compression.
- * Both modes will use ~35kB for decompression (using windowBits=15 for
- * interoperability) */
-#ifndef DROPBEAR_ZLIB_WINDOW_BITS
-#define DROPBEAR_ZLIB_WINDOW_BITS 15 
-#endif
-
-/* Server won't allow zlib compression until after authentication. Prevents
-   flaws in the zlib library being unauthenticated exploitable flaws.
-   Some old ssh clients may not support the alternative [email protected] method */
-#define DROPBEAR_SERVER_DELAY_ZLIB 1
+#include "default_options.h"
 
-/* Whether to do reverse DNS lookups. */
-/*#define DO_HOST_LOOKUP */
-
-/* Whether to print the message of the day (MOTD). This doesn't add much code
- * size */
-#define DO_MOTD
-
-/* The MOTD file path */
-#ifndef MOTD_FILENAME
-#define MOTD_FILENAME "/etc/motd"
-#endif
-
-/* Authentication Types - at least one required.
-   RFC Draft requires pubkey auth, and recommends password */
-
-/* Note: PAM auth is quite simple and only works for PAM modules which just do
- * a simple "Login: " "Password: " (you can edit the strings in svr-authpam.c).
- * It's useful for systems like OS X where standard password crypts don't work
- * but there's an interface via a PAM module. It won't work for more complex
- * PAM challenge/response.
- * You can't enable both PASSWORD and PAM. */
-
-/* This requires crypt() */
-#ifdef HAVE_CRYPT
-#define ENABLE_SVR_PASSWORD_AUTH
-#endif
-/* PAM requires ./configure --enable-pam */
-/*#define ENABLE_SVR_PAM_AUTH */
-#define ENABLE_SVR_PUBKEY_AUTH
-
-/* Whether to take public key options in 
- * authorized_keys file into account */
-#ifdef ENABLE_SVR_PUBKEY_AUTH
-#define ENABLE_SVR_PUBKEY_OPTIONS
-#endif
-
-/* This requires getpass. */
-#ifdef HAVE_GETPASS
-#define ENABLE_CLI_PASSWORD_AUTH
-#define ENABLE_CLI_INTERACT_AUTH
-#endif
-#define ENABLE_CLI_PUBKEY_AUTH
-
-/* A default argument for dbclient -i <privatekey>. 
-Homedir is prepended unless path begins with / */
-#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
-
-/* This variable can be used to set a password for client
- * authentication on the commandline. Beware of platforms
- * that don't protect environment variables of processes etc. Also
- * note that it will be provided for all "hidden" client-interactive
- * style prompts - if you want something more sophisticated, use 
- * SSH_ASKPASS instead. Comment out this var to remove this functionality.*/
-#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
-
-/* Define this (as well as ENABLE_CLI_PASSWORD_AUTH) to allow the use of
- * a helper program for the ssh client. The helper program should be
- * specified in the SSH_ASKPASS environment variable, and dbclient
- * should be run with DISPLAY set and no tty. The program should
- * return the password on standard output */
-/*#define ENABLE_CLI_ASKPASS_HELPER*/
-
-/* Save a network roundtrip by sendng a real auth request immediately after
- * sending a query for the available methods.  It is at the expense of < 100
- * bytes of extra network traffic. This is not yet enabled by default since it
- * could cause problems with non-compliant servers */
-/* #define DROPBEAR_CLI_IMMEDIATE_AUTH */
-
-/* Source for randomness. This must be able to provide hundreds of bytes per SSH
- * connection without blocking. In addition /dev/random is used for seeding
- * rsa/dss key generation */
-#define DROPBEAR_URANDOM_DEV "/dev/urandom"
-
-/* Set this to use PRNGD or EGD instead of /dev/urandom or /dev/random */
-/*#define DROPBEAR_PRNGD_SOCKET "/var/run/dropbear-rng"*/
-
-
-/* Specify the number of clients we will allow to be connected but
- * not yet authenticated. After this limit, connections are rejected */
-/* The first setting is per-IP, to avoid denial of service */
-#ifndef MAX_UNAUTH_PER_IP
-#define MAX_UNAUTH_PER_IP 5
-#endif
-
-/* And then a global limit to avoid chewing memory if connections 
- * come from many IPs */
-#ifndef MAX_UNAUTH_CLIENTS
-#define MAX_UNAUTH_CLIENTS 30
-#endif
-
-/* Maximum number of failed authentication tries (server option) */
-#ifndef MAX_AUTH_TRIES
-#define MAX_AUTH_TRIES 10
-#endif
-
-/* The default file to store the daemon's process ID, for shutdown
-   scripts etc. This can be overridden with the -P flag */
-#ifndef DROPBEAR_PIDFILE
-#define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
-#endif
-
-/* The command to invoke for xauth when using X11 forwarding.
- * "-q" for quiet */
-#ifndef XAUTH_COMMAND
-#define XAUTH_COMMAND "/usr/bin/xauth -q"
-#endif
-
-/* if you want to enable running an sftp server (such as the one included with
- * OpenSSH), set the path below. If the path isn't defined, sftp will not
- * be enabled */
-#ifndef SFTPSERVER_PATH
-#define SFTPSERVER_PATH "/usr/libexec/sftp-server"
-#endif
-
-/* This is used by the scp binary when used as a client binary. If you're
- * not using the Dropbear client, you'll need to change it */
-#define DROPBEAR_PATH_SSH_PROGRAM "/usr/bin/dbclient"
-
-/* Whether to log commands executed by a client. This only logs the 
- * (single) command sent to the server, not what a user did in a 
- * shell/sftp session etc. */
-/* #define LOG_COMMANDS */
-
-/* Window size limits. These tend to be a trade-off between memory
-   usage and network performance: */
-/* Size of the network receive window. This amount of memory is allocated
-   as a per-channel receive buffer. Increasing this value can make a
-   significant difference to network performance. 24kB was empirically
-   chosen for a 100mbit ethernet network. The value can be altered at
-   runtime with the -W argument. */
-#ifndef DEFAULT_RECV_WINDOW
-#define DEFAULT_RECV_WINDOW 24576
-#endif
-/* Maximum size of a received SSH data packet - this _MUST_ be >= 32768
-   in order to interoperate with other implementations */
-#ifndef RECV_MAX_PAYLOAD_LEN
-#define RECV_MAX_PAYLOAD_LEN 32768
-#endif
-/* Maximum size of a transmitted data packet - this can be any value,
-   though increasing it may not make a significant difference. */
-#ifndef TRANS_MAX_PAYLOAD_LEN
-#define TRANS_MAX_PAYLOAD_LEN 16384
-#endif
-
-/* Ensure that data is transmitted every KEEPALIVE seconds. This can
-be overridden at runtime with -K. 0 disables keepalives */
-#define DEFAULT_KEEPALIVE 0
-
-/* If this many KEEPALIVES are sent with no packets received from the
-other side, exit. Not run-time configurable - if you have a need
-for runtime configuration please mail the Dropbear list */
-#define DEFAULT_KEEPALIVE_LIMIT 3
-
-/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
-be overridden at runtime with -I. 0 disables idle timeouts */
-#define DEFAULT_IDLE_TIMEOUT 0
-
-/* The default path. This will often get replaced by the shell */
-#define DEFAULT_PATH "/usr/bin:/bin"
-
-/* Some other defines (that mostly should be left alone) are defined
+/* Some other defines that mostly should be left alone are defined
  * in sysoptions.h */
 #include "sysoptions.h"
 
-#endif /* DROPBEAR_OPTIONS_H_ */
+#endif /* DROPBEAR_OPTIONS_H */
--- a/rsa.c	Thu May 18 23:38:30 2017 +0800
+++ b/rsa.c	Thu May 18 23:45:10 2017 +0800
@@ -36,7 +36,7 @@
 #include "ssh.h"
 #include "dbrandom.h"
 
-#ifdef DROPBEAR_RSA 
+#if DROPBEAR_RSA 
 
 static void rsa_pad_em(dropbear_rsa_key * key,
 	buffer *data_buf, mp_int * rsa_em);
@@ -204,7 +204,7 @@
 
 }
 
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 /* Verify a signature in buf, made on data by the key given.
  * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
 int buf_rsa_verify(buffer * buf, dropbear_rsa_key *key, buffer *data_buf) {
@@ -279,7 +279,7 @@
 
 	/* the actual signing of the padded data */
 
-#ifdef RSA_BLINDING
+#if DROPBEAR_RSA_BLINDING
 
 	/* With blinding, s = (r^(-1))((em)*r^e)^d mod n */
 
@@ -322,7 +322,7 @@
 		dropbear_exit("RSA error");
 	}
 
-#endif /* RSA_BLINDING */
+#endif /* DROPBEAR_RSA_BLINDING */
 
 	mp_clear_multi(&rsa_tmp1, &rsa_tmp2, &rsa_tmp3, NULL);
 	
--- a/rsa.h	Thu May 18 23:38:30 2017 +0800
+++ b/rsa.h	Thu May 18 23:45:10 2017 +0800
@@ -28,7 +28,7 @@
 #include "includes.h"
 #include "buffer.h"
 
-#ifdef DROPBEAR_RSA 
+#if DROPBEAR_RSA 
 
 #define RSA_SIGNATURE_SIZE (4+7+4+40)
 
@@ -44,7 +44,7 @@
 } dropbear_rsa_key;
 
 void buf_put_rsa_sign(buffer* buf, dropbear_rsa_key *key, buffer *data_buf);
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 int buf_rsa_verify(buffer * buf, dropbear_rsa_key *key, buffer *data_buf);
 #endif
 int buf_get_rsa_pub_key(buffer* buf, dropbear_rsa_key *key);
--- a/runopts.h	Thu May 18 23:38:30 2017 +0800
+++ b/runopts.h	Thu May 18 23:45:10 2017 +0800
@@ -33,8 +33,8 @@
 
 typedef struct runopts {
 
-#if defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) \
-    || defined(ENABLE_CLI_REMOTETCPFWD)
+#if DROPBEAR_SVR_REMOTETCPFWD || DROPBEAR_CLI_LOCALTCPFWD \
+    || DROPBEAR_CLI_REMOTETCPFWD
 	int listen_fwd_all;
 #endif
 	unsigned int recv_window;
@@ -53,7 +53,7 @@
 	} compress_mode;
 #endif
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 	char *cipher_list;
 	char *mac_list;
 #endif
@@ -97,10 +97,10 @@
 	int norootpass;
 	int allowblankpass;
 
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 	int noremotetcp;
 #endif
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 	int nolocaltcp;
 #endif
 
@@ -114,6 +114,8 @@
 	buffer * banner;
 	char * pidfile;
 
+	char * forced_command;
+
 } svr_runopts;
 
 extern svr_runopts svr_opts;
@@ -137,19 +139,19 @@
 	int no_cmd;
 	int backgrounded;
 	int is_subsystem;
-#ifdef ENABLE_CLI_PUBKEY_AUTH
+#if DROPBEAR_CLI_PUBKEY_AUTH
 	m_list *privkeys; /* Keys to use for public-key auth */
 #endif
-#ifdef ENABLE_CLI_ANYTCPFWD
+#if DROPBEAR_CLI_ANYTCPFWD
 	int exit_on_fwd_failure;
 #endif
-#ifdef ENABLE_CLI_REMOTETCPFWD
+#if DROPBEAR_CLI_REMOTETCPFWD
 	m_list * remotefwds;
 #endif
-#ifdef ENABLE_CLI_LOCALTCPFWD
+#if DROPBEAR_CLI_LOCALTCPFWD
 	m_list * localfwds;
 #endif
-#ifdef ENABLE_CLI_AGENTFWD
+#if DROPBEAR_CLI_AGENTFWD
 	int agent_fwd;
 	int agent_keys_loaded; /* whether pubkeys has been populated with a 
 							  list of keys held by the agent */
@@ -157,11 +159,11 @@
 	                 agent sessions have their own file descriptors */
 #endif
 
-#ifdef ENABLE_CLI_NETCAT
+#if DROPBEAR_CLI_NETCAT
 	char *netcat_host;
 	unsigned int netcat_port;
 #endif
-#ifdef ENABLE_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD
 	char *proxycmd;
 #endif
 } cli_runopts;
@@ -169,7 +171,7 @@
 extern cli_runopts cli_opts;
 void cli_getopts(int argc, char ** argv);
 
-#ifdef ENABLE_USER_ALGO_LIST
+#if DROPBEAR_USER_ALGO_LIST
 void parse_ciphers_macs(void);
 #endif
 
--- a/scp.c	Thu May 18 23:38:30 2017 +0800
+++ b/scp.c	Thu May 18 23:45:10 2017 +0800
@@ -133,7 +133,7 @@
 			fprintf(stderr, " %s", a->list[i]);
 		fprintf(stderr, "\n");
 	}
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	pid = vfork();
 #else
 	pid = fork();
@@ -144,7 +144,7 @@
 	if (pid == 0) {
 		execvp(a->list[0], a->list);
 		perror(a->list[0]);
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 		_exit(1);
 #else
 		exit(1);
@@ -213,12 +213,12 @@
 
 	/* uClinux needs to build the args here before vforking,
 	   otherwise we do it later on. */
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	arg_setup(host, remuser, cmd);
 #endif
 
 	/* Fork a child to execute the command on the remote host using ssh. */
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	do_cmd_pid = vfork();
 #else
 	do_cmd_pid = fork();
@@ -233,13 +233,13 @@
 		close(pin[0]);
 		close(pout[1]);
 
-#ifndef USE_VFORK
+#if !DROPBEAR_VFORK
 		arg_setup(host, remuser, cmd);
 #endif
 
 		execvp(ssh_program, args.list);
 		perror(ssh_program);
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 		_exit(1);
 #else
 		exit(1);
@@ -248,7 +248,7 @@
 		fatal("fork: %s", strerror(errno));
 	}
 
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	/* clean up command */
 	/* pop cmd */
 	xfree(args.list[args.num-1]);
@@ -304,8 +304,8 @@
 void toremote(char *, int, char *[]);
 void usage(void);
 
-#if defined(DBMULTI_scp) || !defined(DROPBEAR_MULTI)
-#if defined(DBMULTI_scp) && defined(DROPBEAR_MULTI)
+#if defined(DBMULTI_scp) || !DROPBEAR_MULTI
+#if defined(DBMULTI_scp) && DROPBEAR_MULTI
 int scp_main(int argc, char **argv)
 #else
 int
--- a/scpmisc.h	Thu May 18 23:38:30 2017 +0800
+++ b/scpmisc.h	Thu May 18 23:45:10 2017 +0800
@@ -12,9 +12,6 @@
  * called by a name other than "ssh" or "Secure Shell".
  */
 
-/* actually from atomicio, but is only used in scp code */
-#define vwrite (ssize_t (*)(int, void *, size_t))write
-
 char	*chop(char *);
 char	*strdelim(char **);
 void	 set_nonblock(int);
--- a/session.h	Thu May 18 23:38:30 2017 +0800
+++ b/session.h	Thu May 18 23:45:10 2017 +0800
@@ -79,7 +79,7 @@
 	/* actual keys */
 	union {
 		symmetric_CBC cbc;
-#ifdef DROPBEAR_ENABLE_CTR_MODE
+#if DROPBEAR_ENABLE_CTR_MODE
 		symmetric_CTR ctr;
 #endif
 	} cipher_state;
@@ -237,7 +237,7 @@
 	/* The resolved remote address, used for lastlog etc */
 	char *remotehost;
 
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	pid_t server_pid;
 #endif
 
@@ -288,7 +288,7 @@
 	int lastauthtype; /* either AUTH_TYPE_PUBKEY or AUTH_TYPE_PASSWORD,
 						 for the last type of auth we tried */
 	int ignore_next_auth_response;
-#ifdef ENABLE_CLI_INTERACT_AUTH
+#if DROPBEAR_CLI_INTERACT_AUTH
 	int auth_interact_failed; /* flag whether interactive auth can still
 								 be used */
 	int interact_request_received; /* flag whether we've received an 
@@ -311,11 +311,11 @@
 /* Global structs storing the state */
 extern struct sshsession ses;
 
-#ifdef DROPBEAR_SERVER
+#if DROPBEAR_SERVER
 extern struct serversession svr_ses;
 #endif /* DROPBEAR_SERVER */
 
-#ifdef DROPBEAR_CLIENT
+#if DROPBEAR_CLIENT
 extern struct clientsession cli_ses;
 #endif /* DROPBEAR_CLIENT */
 
--- a/signkey.c	Thu May 18 23:38:30 2017 +0800
+++ b/signkey.c	Thu May 18 23:45:10 2017 +0800
@@ -30,13 +30,13 @@
 #include "ecdsa.h"
 
 static const char * const signkey_names[DROPBEAR_SIGNKEY_NUM_NAMED] = {
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	"ssh-rsa",
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	"ssh-dss",
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	"ecdsa-sha2-nistp256",
 	"ecdsa-sha2-nistp384",
 	"ecdsa-sha2-nistp521"
@@ -75,7 +75,7 @@
 		if (namelen == strlen(fixed_name)
 			&& memcmp(fixed_name, name, namelen) == 0) {
 
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 			/* Some of the ECDSA key sizes are defined even if they're not compiled in */
 			if (0
 #ifndef DROPBEAR_ECC_256
@@ -106,25 +106,25 @@
 void **
 signkey_key_ptr(sign_key *key, enum signkey_type type) {
 	switch (type) {
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
 			return (void**)&key->ecckey256;
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
 			return (void**)&key->ecckey384;
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
 			return (void**)&key->ecckey521;
 #endif
 #endif /* DROPBEAR_ECDSA */
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
 			return (void**)&key->rsakey;
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 		case DROPBEAR_SIGNKEY_DSS:
 			return (void**)&key->dsskey;
 #endif
@@ -161,7 +161,7 @@
 	/* Rewind the buffer back before "ssh-rsa" etc */
 	buf_incrpos(buf, -len - 4);
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (keytype == DROPBEAR_SIGNKEY_DSS) {
 		dss_key_free(key->dsskey);
 		key->dsskey = m_malloc(sizeof(*key->dsskey));
@@ -171,7 +171,7 @@
 		}
 	}
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (keytype == DROPBEAR_SIGNKEY_RSA) {
 		rsa_key_free(key->rsakey);
 		key->rsakey = m_malloc(sizeof(*key->rsakey));
@@ -181,7 +181,7 @@
 		}
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(keytype)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, keytype);
 		if (eck) {
@@ -230,7 +230,7 @@
 	/* Rewind the buffer back before "ssh-rsa" etc */
 	buf_incrpos(buf, -len - 4);
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (keytype == DROPBEAR_SIGNKEY_DSS) {
 		dss_key_free(key->dsskey);
 		key->dsskey = m_malloc(sizeof(*key->dsskey));
@@ -240,7 +240,7 @@
 		}
 	}
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (keytype == DROPBEAR_SIGNKEY_RSA) {
 		rsa_key_free(key->rsakey);
 		key->rsakey = m_malloc(sizeof(*key->rsakey));
@@ -250,7 +250,7 @@
 		}
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(keytype)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, keytype);
 		if (eck) {
@@ -281,17 +281,17 @@
 	TRACE2(("enter buf_put_pub_key"))
 	pubkeys = buf_new(MAX_PUBKEY_SIZE);
 	
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (type == DROPBEAR_SIGNKEY_DSS) {
 		buf_put_dss_pub_key(pubkeys, key->dsskey);
 	}
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {
 		buf_put_rsa_pub_key(pubkeys, key->rsakey);
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(type)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
 		if (eck) {
@@ -314,21 +314,21 @@
 	TRACE(("enter buf_put_priv_key"))
 	TRACE(("type is %d", type))
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (type == DROPBEAR_SIGNKEY_DSS) {
 		buf_put_dss_priv_key(buf, key->dsskey);
 		TRACE(("leave buf_put_priv_key: dss done"))
 		return;
 	}
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {
 		buf_put_rsa_priv_key(buf, key->rsakey);
 		TRACE(("leave buf_put_priv_key: rsa done"))
 		return;
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(type)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
 		if (eck) {
@@ -345,30 +345,30 @@
 
 	TRACE2(("enter sign_key_free"))
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	dss_key_free(key->dsskey);
 	key->dsskey = NULL;
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	rsa_key_free(key->rsakey);
 	key->rsakey = NULL;
 #endif
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 	if (key->ecckey256) {
 		ecc_free(key->ecckey256);
 		m_free(key->ecckey256);
 		key->ecckey256 = NULL;
 	}
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	if (key->ecckey384) {
 		ecc_free(key->ecckey384);
 		m_free(key->ecckey384);
 		key->ecckey384 = NULL;
 	}
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	if (key->ecckey521) {
 		ecc_free(key->ecckey521);
 		m_free(key->ecckey521);
@@ -395,7 +395,7 @@
 
 /* Since we're not sure if we'll have md5 or sha1, we present both.
  * MD5 is used in preference, but sha1 could still be useful */
-#ifdef DROPBEAR_MD5_HMAC
+#if DROPBEAR_MD5_HMAC
 static char * sign_key_md5_fingerprint(unsigned char* keyblob,
 		unsigned int keybloblen) {
 
@@ -470,7 +470,7 @@
  * in either sha1 or md5 */
 char * sign_key_fingerprint(unsigned char* keyblob, unsigned int keybloblen) {
 
-#ifdef DROPBEAR_MD5_HMAC
+#if DROPBEAR_MD5_HMAC
 	return sign_key_md5_fingerprint(keyblob, keybloblen);
 #else
 	return sign_key_sha1_fingerprint(keyblob, keybloblen);
@@ -482,17 +482,17 @@
 	buffer *sigblob;
 	sigblob = buf_new(MAX_PUBKEY_SIZE);
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (type == DROPBEAR_SIGNKEY_DSS) {
 		buf_put_dss_sign(sigblob, key->dsskey, data_buf);
 	}
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {
 		buf_put_rsa_sign(sigblob, key->rsakey, data_buf);
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(type)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
 		if (eck) {
@@ -508,7 +508,7 @@
 
 }
 
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 /* Return DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
  * If FAILURE is returned, the position of
  * buf is undefined. If SUCCESS is returned, buf will be positioned after the
@@ -526,7 +526,7 @@
 	type = signkey_type_from_name(type_name, type_name_len);
 	m_free(type_name);
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (type == DROPBEAR_SIGNKEY_DSS) {
 		if (key->dsskey == NULL) {
 			dropbear_exit("No DSS key to verify signature");
@@ -535,7 +535,7 @@
 	}
 #endif
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {
 		if (key->rsakey == NULL) {
 			dropbear_exit("No RSA key to verify signature");
@@ -543,7 +543,7 @@
 		return buf_rsa_verify(buf, key->rsakey, data_buf);
 	}
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	if (signkey_is_ecdsa(type)) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, type);
 		if (eck) {
@@ -557,7 +557,7 @@
 }
 #endif /* DROPBEAR_SIGNKEY_VERIFY */
 
-#ifdef DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
+#if DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
 
 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE when given a buffer containing
  * a key, a key, and a type. The buffer is positioned at the start of the
--- a/signkey.h	Thu May 18 23:38:30 2017 +0800
+++ b/signkey.h	Thu May 18 23:45:10 2017 +0800
@@ -30,13 +30,13 @@
 #include "rsa.h"
 
 enum signkey_type {
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	DROPBEAR_SIGNKEY_RSA,
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	DROPBEAR_SIGNKEY_DSS,
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	DROPBEAR_SIGNKEY_ECDSA_NISTP256,
 	DROPBEAR_SIGNKEY_ECDSA_NISTP384,
 	DROPBEAR_SIGNKEY_ECDSA_NISTP521,
@@ -61,20 +61,20 @@
 	signkey_source source;
 	char *filename;
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	dropbear_dss_key * dsskey;
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	dropbear_rsa_key * rsakey;
 #endif
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 	ecc_key * ecckey256;
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	ecc_key * ecckey384;
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	ecc_key * ecckey521;
 #endif
 #endif
@@ -91,7 +91,7 @@
 void buf_put_priv_key(buffer* buf, sign_key *key, enum signkey_type type);
 void sign_key_free(sign_key *key);
 void buf_put_sign(buffer* buf, sign_key *key, enum signkey_type type, buffer *data_buf);
-#ifdef DROPBEAR_SIGNKEY_VERIFY
+#if DROPBEAR_SIGNKEY_VERIFY
 int buf_verify(buffer * buf, sign_key *key, buffer *data_buf);
 char * sign_key_fingerprint(unsigned char* keyblob, unsigned int keybloblen);
 #endif
--- a/svr-agentfwd.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-agentfwd.c	Thu May 18 23:45:10 2017 +0800
@@ -27,7 +27,7 @@
 
 #include "includes.h"
 
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 
 #include "agentfwd.h"
 #include "session.h"
--- a/svr-auth.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-auth.c	Thu May 18 23:45:10 2017 +0800
@@ -56,10 +56,10 @@
 static void authclear() {
 	
 	memset(&ses.authstate, 0, sizeof(ses.authstate));
-#ifdef ENABLE_SVR_PUBKEY_AUTH
+#if DROPBEAR_SVR_PUBKEY_AUTH
 	ses.authstate.authtypes |= AUTH_TYPE_PUBKEY;
 #endif
-#if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
+#if DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH
 	if (!svr_opts.noauthpass) {
 		ses.authstate.authtypes |= AUTH_TYPE_PASSWORD;
 	}
@@ -169,7 +169,7 @@
 		}
 	}
 	
-#ifdef ENABLE_SVR_PASSWORD_AUTH
+#if DROPBEAR_SVR_PASSWORD_AUTH
 	if (!svr_opts.noauthpass &&
 			!(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
 		/* user wants to try password auth */
@@ -184,7 +184,7 @@
 	}
 #endif
 
-#ifdef ENABLE_SVR_PAM_AUTH
+#if DROPBEAR_SVR_PAM_AUTH
 	if (!svr_opts.noauthpass &&
 			!(svr_opts.norootpass && ses.authstate.pw_uid == 0) ) {
 		/* user wants to try password auth */
@@ -199,7 +199,7 @@
 	}
 #endif
 
-#ifdef ENABLE_SVR_PUBKEY_AUTH
+#if DROPBEAR_SVR_PUBKEY_AUTH
 	/* user wants to try pubkey auth */
 	if (methodlen == AUTH_METHOD_PUBKEY_LEN &&
 			strncmp(methodname, AUTH_METHOD_PUBKEY,
--- a/svr-authpam.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-authpam.c	Thu May 18 23:45:10 2017 +0800
@@ -31,7 +31,7 @@
 #include "dbutil.h"
 #include "auth.h"
 
-#ifdef ENABLE_SVR_PAM_AUTH
+#if DROPBEAR_SVR_PAM_AUTH
 
 #if defined(HAVE_SECURITY_PAM_APPL_H)
 #include <security/pam_appl.h>
@@ -270,4 +270,4 @@
 	}
 }
 
-#endif /* ENABLE_SVR_PAM_AUTH */
+#endif /* DROPBEAR_SVR_PAM_AUTH */
--- a/svr-authpasswd.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-authpasswd.c	Thu May 18 23:45:10 2017 +0800
@@ -31,7 +31,7 @@
 #include "auth.h"
 #include "runopts.h"
 
-#ifdef ENABLE_SVR_PASSWORD_AUTH
+#if DROPBEAR_SVR_PASSWORD_AUTH
 
 /* not constant time when strings are differing lengths. 
  string content isn't leaked, and crypt hashes are predictable length. */
--- a/svr-authpubkey.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-authpubkey.c	Thu May 18 23:45:10 2017 +0800
@@ -65,7 +65,7 @@
 #include "packet.h"
 #include "algo.h"
 
-#ifdef ENABLE_SVR_PUBKEY_AUTH
+#if DROPBEAR_SVR_PUBKEY_AUTH
 
 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
@@ -201,6 +201,8 @@
 	unsigned int len, pos;
 	buffer * options_buf = NULL;
 	int line_num;
+	uid_t origuid;
+	gid_t origgid;
 
 	TRACE(("enter checkpubkey"))
 
@@ -227,8 +229,21 @@
 	snprintf(filename, len + 22, "%s/.ssh/authorized_keys", 
 				ses.authstate.pw_dir);
 
-	/* open the file */
+	/* open the file as the authenticating user. */
+	origuid = getuid();
+	origgid = getgid();
+	if ((setegid(ses.authstate.pw_gid)) < 0 ||
+		(seteuid(ses.authstate.pw_uid)) < 0) {
+		dropbear_exit("Failed to set euid");
+	}
+
 	authfile = fopen(filename, "r");
+
+	if ((seteuid(origuid)) < 0 ||
+		(setegid(origgid)) < 0) {
+		dropbear_exit("Failed to revert euid");
+	}
+
 	if (authfile == NULL) {
 		goto out;
 	}
--- a/svr-authpubkeyoptions.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-authpubkeyoptions.c	Thu May 18 23:45:10 2017 +0800
@@ -47,7 +47,7 @@
 #include "signkey.h"
 #include "auth.h"
 
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 
 /* Returns 1 if pubkey allows agent forwarding,
  * 0 otherwise */
@@ -95,6 +95,7 @@
 		if (chansess->cmd) {
 			/* original_command takes ownership */
 			chansess->original_command = chansess->cmd;
+			chansess->cmd = NULL;
 		} else {
 			chansess->original_command = m_strdup("");
 		}
@@ -108,6 +109,9 @@
 /* Free potential public key options */
 void svr_pubkey_options_cleanup() {
 	if (ses.authstate.pubkey_options) {
+		if (ses.authstate.pubkey_options->forced_command) {
+			m_free(ses.authstate.pubkey_options->forced_command);
+		}
 		m_free(ses.authstate.pubkey_options);
 		ses.authstate.pubkey_options = NULL;
 	}
@@ -143,14 +147,14 @@
 			ses.authstate.pubkey_options->no_port_forwarding_flag = 1;
 			goto next_option;
 		}
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 		if (match_option(options_buf, "no-agent-forwarding") == DROPBEAR_SUCCESS) {
 			dropbear_log(LOG_WARNING, "Agent forwarding disabled.");
 			ses.authstate.pubkey_options->no_agent_forwarding_flag = 1;
 			goto next_option;
 		}
 #endif
-#ifdef ENABLE_X11FWD
+#if DROPBEAR_X11FWD
 		if (match_option(options_buf, "no-X11-forwarding") == DROPBEAR_SUCCESS) {
 			dropbear_log(LOG_WARNING, "X11 forwarding disabled.");
 			ses.authstate.pubkey_options->no_x11_forwarding_flag = 1;
@@ -200,8 +204,7 @@
 
 bad_option:
 	ret = DROPBEAR_FAILURE;
-	m_free(ses.authstate.pubkey_options);
-	ses.authstate.pubkey_options = NULL;
+	svr_pubkey_options_cleanup();
 	dropbear_log(LOG_WARNING, "Bad public key options at %s:%d", filename, line_num);
 
 end:
--- a/svr-chansession.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-chansession.c	Thu May 18 23:45:10 2017 +0800
@@ -254,13 +254,13 @@
 
 	channel->typedata = chansess;
 
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 	chansess->x11listener = NULL;
 	chansess->x11authprot = NULL;
 	chansess->x11authcookie = NULL;
 #endif
 
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 	chansess->agentlistener = NULL;
 	chansess->agentfile = NULL;
 	chansess->agentdir = NULL;
@@ -301,7 +301,7 @@
 	m_free(chansess->cmd);
 	m_free(chansess->term);
 
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	m_free(chansess->original_command);
 #endif
 
@@ -315,11 +315,11 @@
 		m_free(chansess->tty);
 	}
 
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 	x11cleanup(chansess);
 #endif
 
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 	svr_agentcleanup(chansess);
 #endif
 
@@ -373,11 +373,11 @@
 		ret = sessioncommand(channel, chansess, 1, 0);
 	} else if (strcmp(type, "subsystem") == 0) {
 		ret = sessioncommand(channel, chansess, 1, 1);
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 	} else if (strcmp(type, "x11-req") == 0) {
 		ret = x11req(chansess);
 #endif
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 	} else if (strcmp(type, "[email protected]") == 0) {
 		ret = svr_agentreq(chansess);
 #endif
@@ -603,7 +603,7 @@
 	return DROPBEAR_SUCCESS;
 }
 
-#ifndef USE_VFORK
+#if !DROPBEAR_VFORK
 static void make_connection_string(struct ChanSess *chansess) {
 	char *local_ip, *local_port, *remote_ip, *remote_port;
 	size_t len;
@@ -634,7 +634,7 @@
 static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
 		int iscmd, int issubsys) {
 
-	unsigned int cmdlen;
+	unsigned int cmdlen = 0;
 	int ret;
 
 	TRACE(("enter sessioncommand"))
@@ -671,8 +671,16 @@
 		}
 	}
 	
-	/* take public key option 'command' into account */
-	svr_pubkey_set_forced_command(chansess);
+
+	/* take global command into account */
+	if (svr_opts.forced_command) {
+		chansess->original_command = chansess->cmd ? : m_strdup("");
+		chansess->cmd = m_strdup(svr_opts.forced_command);
+	} else {
+		/* take public key option 'command' into account */
+		svr_pubkey_set_forced_command(chansess);
+	}
+
 
 #ifdef LOG_COMMANDS
 	if (chansess->cmd) {
@@ -686,7 +694,7 @@
 
 	/* uClinux will vfork(), so there'll be a race as 
 	connection_string is freed below. */
-#ifndef USE_VFORK
+#if !DROPBEAR_VFORK
 	make_connection_string(chansess);
 #endif
 
@@ -702,7 +710,7 @@
 		ret = ptycommand(channel, chansess);
 	}
 
-#ifndef USE_VFORK
+#if !DROPBEAR_VFORK
 	m_free(chansess->connection_string);
 	m_free(chansess->client_string);
 #endif
@@ -776,7 +784,7 @@
 		return DROPBEAR_FAILURE;
 	}
 	
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	pid = vfork();
 #else
 	pid = fork();
@@ -896,7 +904,7 @@
 
 	/* with uClinux we'll have vfork()ed, so don't want to overwrite the
 	 * hostkey. can't think of a workaround to clear it */
-#ifndef USE_VFORK
+#if !DROPBEAR_VFORK
 	/* wipe the hostkey */
 	sign_key_free(svr_opts.hostkey);
 	svr_opts.hostkey = NULL;
@@ -965,7 +973,7 @@
 		addnewvar("SSH_CLIENT", chansess->client_string);
 	}
 	
-#ifdef ENABLE_SVR_PUBKEY_OPTIONS
+#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	if (chansess->original_command) {
 		addnewvar("SSH_ORIGINAL_COMMAND", chansess->original_command);
 	}
@@ -976,11 +984,11 @@
 		dropbear_exit("Error changing directory");
 	}
 
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 	/* set up X11 forwarding if enabled */
 	x11setauth(chansess);
 #endif
-#ifdef ENABLE_SVR_AGENTFWD
+#if DROPBEAR_SVR_AGENTFWD
 	/* set up agent env variable */
 	svr_agentset(chansess);
 #endif
--- a/svr-kex.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-kex.c	Thu May 18 23:45:10 2017 +0800
@@ -54,18 +54,24 @@
 	}
 
 	switch (ses.newkeys->algo_kex->mode) {
+#if DROPBEAR_NORMAL_DH
 		case DROPBEAR_KEX_NORMAL_DH:
 			m_mp_init(&dh_e);
 			if (buf_getmpint(ses.payload, &dh_e) != DROPBEAR_SUCCESS) {
 				dropbear_exit("Bad kex value");
 			}
 			break;
+#endif
+#if DROPBEAR_ECDH
 		case DROPBEAR_KEX_ECDH:
+#endif
+#if DROPBEAR_CURVE25519
 		case DROPBEAR_KEX_CURVE25519:
-#if defined(DROPBEAR_ECDH) || defined(DROPBEAR_CURVE25519)
+#endif
+#if DROPBEAR_ECDH || DROPBEAR_CURVE25519
 			ecdh_qs = buf_getstringbuf(ses.payload);
+			break;
 #endif
-			break;
 	}
 	if (ses.payload->pos != ses.payload->len) {
 		dropbear_exit("Bad kex value");
@@ -85,31 +91,11 @@
 }
 
 
-#ifdef DROPBEAR_DELAY_HOSTKEY
-
-static void fsync_parent_dir(const char* fn) {
-#ifdef HAVE_LIBGEN_H
-	char *fn_dir = m_strdup(fn);
-	char *dir = dirname(fn_dir);
-	int dirfd = open(dir, O_RDONLY);
-
-	if (dirfd != -1) {
-		if (fsync(dirfd) != 0) {
-			TRACE(("fsync of directory %s failed: %s", dir, strerror(errno)))
-		}
-		m_close(dirfd);
-	} else {
-		TRACE(("error opening directory %s for fsync: %s", dir, strerror(errno)))
-	}
-
-	free(fn_dir);
-#endif
-}
+#if DROPBEAR_DELAY_HOSTKEY
 
 static void svr_ensure_hostkey() {
 
 	const char* fn = NULL;
-	char *fn_temp = NULL;
 	enum signkey_type type = ses.newkeys->algo_hostkey;
 	void **hostkey = signkey_key_ptr(svr_opts.hostkey, type);
 	int ret = DROPBEAR_FAILURE;
@@ -120,17 +106,17 @@
 
 	switch (type)
 	{
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
 			fn = RSA_PRIV_FILENAME;
 			break;
 #endif
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 		case DROPBEAR_SIGNKEY_DSS:
 			fn = DSS_PRIV_FILENAME;
 			break;
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
 		case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
@@ -145,28 +131,10 @@
 		return;
 	}
 
-	fn_temp = m_malloc(strlen(fn) + 20);
-	snprintf(fn_temp, strlen(fn)+20, "%s.tmp%d", fn, getpid());
-
-	if (signkey_generate(type, 0, fn_temp) == DROPBEAR_FAILURE) {
+	if (signkey_generate(type, 0, fn, 1) == DROPBEAR_FAILURE) {
 		goto out;
 	}
-
-	if (link(fn_temp, fn) < 0) {
-		/* It's OK to get EEXIST - we probably just lost a race
-		with another connection to generate the key */
-		if (errno != EEXIST) {
-			dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", fn,
-				strerror(errno));
-			/* XXX fallback to non-atomic copy for some filesystems? */
-			goto out;
-		}
-	}
-
-	/* ensure directory update is flushed to disk, otherwise we can end up
-	with zero-byte hostkey files if the power goes off */
-	fsync_parent_dir(fn);
-
+	
 	ret = readhostkey(fn, svr_opts.hostkey, &type);
 
 	if (ret == DROPBEAR_SUCCESS) {
@@ -184,11 +152,6 @@
 	}
 
 out:
-	if (fn_temp) {
-		unlink(fn_temp);
-		m_free(fn_temp);
-	}
-
 	if (ret == DROPBEAR_FAILURE)
 	{
 		dropbear_exit("Couldn't read or generate hostkey %s", fn);
@@ -209,7 +172,7 @@
 	/* we can start creating the kexdh_reply packet */
 	CHECKCLEARTOWRITE();
 
-#ifdef DROPBEAR_DELAY_HOSTKEY
+#if DROPBEAR_DELAY_HOSTKEY
 	if (svr_opts.delay_hostkey)
 	{
 		svr_ensure_hostkey();
@@ -221,6 +184,7 @@
 			ses.newkeys->algo_hostkey);
 
 	switch (ses.newkeys->algo_kex->mode) {
+#if DROPBEAR_NORMAL_DH
 		case DROPBEAR_KEX_NORMAL_DH:
 			{
 			struct kex_dh_param * dh_param = gen_kexdh_param();
@@ -231,8 +195,9 @@
 			free_kexdh_param(dh_param);
 			}
 			break;
+#endif
+#if DROPBEAR_ECDH
 		case DROPBEAR_KEX_ECDH:
-#ifdef DROPBEAR_ECDH
 			{
 			struct kex_ecdh_param *ecdh_param = gen_kexecdh_param();
 			kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
@@ -240,18 +205,18 @@
 			buf_put_ecc_raw_pubkey_string(ses.writepayload, &ecdh_param->key);
 			free_kexecdh_param(ecdh_param);
 			}
+			break;
 #endif
-			break;
+#if DROPBEAR_CURVE25519
 		case DROPBEAR_KEX_CURVE25519:
-#ifdef DROPBEAR_CURVE25519
 			{
 			struct kex_curve25519_param *param = gen_kexcurve25519_param();
 			kexcurve25519_comb_key(param, ecdh_qs, svr_opts.hostkey);
 			buf_putstring(ses.writepayload, (const char*)param->pub, CURVE25519_LEN);
 			free_kexcurve25519_param(param);
 			}
+			break;
 #endif
-			break;
 	}
 
 	/* calc the signature */
--- a/svr-main.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-main.c	Thu May 18 23:45:10 2017 +0800
@@ -43,8 +43,8 @@
 #endif
 static void commonsetup(void);
 
-#if defined(DBMULTI_dropbear) || !defined(DROPBEAR_MULTI)
-#if defined(DBMULTI_dropbear) && defined(DROPBEAR_MULTI)
+#if defined(DBMULTI_dropbear) || !DROPBEAR_MULTI
+#if defined(DBMULTI_dropbear) && DROPBEAR_MULTI
 int dropbear_main(int argc, char ** argv)
 #else
 int main(int argc, char ** argv)
@@ -144,7 +144,7 @@
 	/* fork */
 	if (svr_opts.forkbg) {
 		int closefds = 0;
-#ifndef DEBUG_TRACE
+#if !DEBUG_TRACE
 		if (!opts.usingsyslog) {
 			closefds = 1;
 		}
@@ -429,7 +429,7 @@
 		for (n = 0; n < (unsigned int)nsock; n++) {
 			int sock = socks[sockpos + n];
 			set_sock_priority(sock, DROPBEAR_PRIO_LOWDELAY);
-#ifdef DROPBEAR_SERVER_TCP_FAST_OPEN
+#if DROPBEAR_SERVER_TCP_FAST_OPEN
 			set_listen_fast_open(sock);
 #endif
 		}
--- a/svr-runopts.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-runopts.c	Thu May 18 23:45:10 2017 +0800
@@ -46,16 +46,16 @@
 					"		(default: none)\n"
 					"-r keyfile  Specify hostkeys (repeatable)\n"
 					"		defaults: \n"
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 					"		dss %s\n"
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 					"		rsa %s\n"
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 					"		ecdsa %s\n"
 #endif
-#ifdef DROPBEAR_DELAY_HOSTKEY
+#if DROPBEAR_DELAY_HOSTKEY
 					"-R		Create hostkeys as required\n" 
 #endif
 					"-F		Don't fork into background\n"
@@ -68,17 +68,18 @@
 					"-m		Don't display the motd on login\n"
 #endif
 					"-w		Disallow root logins\n"
-#if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
+#if DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH
 					"-s		Disable password logins\n"
 					"-g		Disable password logins for root\n"
 					"-B		Allow blank password logins\n"
 #endif
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 					"-j		Disable local port forwarding\n"
 #endif
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 					"-k		Disable remote port forwarding\n"
 					"-a		Allow connections to forwarded ports from any host\n"
+					"-c command	Force executed command\n"
 #endif
 					"-p [address:]port\n"
 					"		Listen on specified tcp port (and optionally address),\n"
@@ -93,17 +94,17 @@
 					"-K <keepalive>  (0 is never, default %d, in seconds)\n"
 					"-I <idle_timeout>  (0 is never, default %d, in seconds)\n"
 					"-V    Version\n"
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 					"-v		verbose (compiled with DEBUG_TRACE)\n"
 #endif
 					,DROPBEAR_VERSION, progname,
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 					DSS_PRIV_FILENAME,
 #endif
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 					RSA_PRIV_FILENAME,
 #endif
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 					ECDSA_PRIV_FILENAME,
 #endif
 					DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE,
@@ -125,6 +126,7 @@
 	/* see printhelp() for options */
 	svr_opts.bannerfile = NULL;
 	svr_opts.banner = NULL;
+	svr_opts.forced_command = NULL;
 	svr_opts.forkbg = 1;
 	svr_opts.norootlogin = 0;
 	svr_opts.noauthpass = 0;
@@ -135,19 +137,15 @@
 	svr_opts.hostkey = NULL;
 	svr_opts.delay_hostkey = 0;
 	svr_opts.pidfile = DROPBEAR_PIDFILE;
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 	svr_opts.nolocaltcp = 0;
 #endif
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 	svr_opts.noremotetcp = 0;
 #endif
 
 #ifndef DISABLE_ZLIB
-#if DROPBEAR_SERVER_DELAY_ZLIB
 	opts.compress_mode = DROPBEAR_COMPRESS_DELAYED;
-#else
-	opts.compress_mode = DROPBEAR_COMPRESS_ON;
-#endif
 #endif 
 
 	/* not yet
@@ -164,7 +162,7 @@
 	opts.keepalive_secs = DEFAULT_KEEPALIVE;
 	opts.idle_timeout_secs = DEFAULT_IDLE_TIMEOUT;
 	
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 	opts.listen_fwd_all = 0;
 #endif
 
@@ -177,6 +175,9 @@
 				case 'b':
 					next = &svr_opts.bannerfile;
 					break;
+				case 'c':
+					next = &svr_opts.forced_command;
+					break;
 				case 'd':
 				case 'r':
 					next = &keyfile;
@@ -192,12 +193,12 @@
 					opts.usingsyslog = 0;
 					break;
 #endif
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 				case 'j':
 					svr_opts.nolocaltcp = 1;
 					break;
 #endif
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 				case 'k':
 					svr_opts.noremotetcp = 1;
 					break;
@@ -234,7 +235,7 @@
 				case 'I':
 					next = &idle_timeout_arg;
 					break;
-#if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
+#if DROPBEAR_SVR_PASSWORD_AUTH || DROPBEAR_SVR_PAM_AUTH
 				case 's':
 					svr_opts.noauthpass = 1;
 					break;
@@ -252,7 +253,7 @@
 				case 'u':
 					/* backwards compatibility with old urandom option */
 					break;
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 				case 'v':
 					debug_trace = 1;
 					break;
@@ -346,6 +347,10 @@
 		}
 		opts.idle_timeout_secs = val;
 	}
+
+	if (svr_opts.forced_command) {
+		dropbear_log(LOG_INFO, "Forced command set to '%s'", svr_opts.forced_command);
+	}
 }
 
 static void addportandaddress(const char* spec) {
@@ -434,30 +439,30 @@
 		}
 	}
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {
 		loadhostkey_helper("RSA", (void**)&read_key->rsakey, (void**)&svr_opts.hostkey->rsakey, fatal_duplicate);
 	}
 #endif
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (type == DROPBEAR_SIGNKEY_DSS) {
 		loadhostkey_helper("DSS", (void**)&read_key->dsskey, (void**)&svr_opts.hostkey->dsskey, fatal_duplicate);
 	}
 #endif
 
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 	if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP256) {
 		loadhostkey_helper("ECDSA256", (void**)&read_key->ecckey256, (void**)&svr_opts.hostkey->ecckey256, fatal_duplicate);
 	}
 #endif
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP384) {
 		loadhostkey_helper("ECDSA384", (void**)&read_key->ecckey384, (void**)&svr_opts.hostkey->ecckey384, fatal_duplicate);
 	}
 #endif
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	if (type == DROPBEAR_SIGNKEY_ECDSA_NISTP521) {
 		loadhostkey_helper("ECDSA521", (void**)&read_key->ecckey521, (void**)&svr_opts.hostkey->ecckey521, fatal_duplicate);
 	}
@@ -489,25 +494,25 @@
 		m_free(hostkey_file);
 	}
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	loadhostkey(RSA_PRIV_FILENAME, 0);
 #endif
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	loadhostkey(DSS_PRIV_FILENAME, 0);
 #endif
 
-#ifdef DROPBEAR_ECDSA
+#if DROPBEAR_ECDSA
 	loadhostkey(ECDSA_PRIV_FILENAME, 0);
 #endif
 
-#ifdef DROPBEAR_DELAY_HOSTKEY
+#if DROPBEAR_DELAY_HOSTKEY
 	if (svr_opts.delay_hostkey) {
 		disable_unset_keys = 0;
 	}
 #endif
 
-#ifdef DROPBEAR_RSA
+#if DROPBEAR_RSA
 	if (disable_unset_keys && !svr_opts.hostkey->rsakey) {
 		disablekey(DROPBEAR_SIGNKEY_RSA);
 	} else {
@@ -515,7 +520,7 @@
 	}
 #endif
 
-#ifdef DROPBEAR_DSS
+#if DROPBEAR_DSS
 	if (disable_unset_keys && !svr_opts.hostkey->dsskey) {
 		disablekey(DROPBEAR_SIGNKEY_DSS);
 	} else {
@@ -524,8 +529,8 @@
 #endif
 
 
-#ifdef DROPBEAR_ECDSA
-#ifdef DROPBEAR_ECC_256
+#if DROPBEAR_ECDSA
+#if DROPBEAR_ECC_256
 	if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 256)
 		&& !svr_opts.hostkey->ecckey256) {
 		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP256);
@@ -534,7 +539,7 @@
 	}
 #endif
 
-#ifdef DROPBEAR_ECC_384
+#if DROPBEAR_ECC_384
 	if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 384)
 		&& !svr_opts.hostkey->ecckey384) {
 		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP384);
@@ -543,7 +548,7 @@
 	}
 #endif
 
-#ifdef DROPBEAR_ECC_521
+#if DROPBEAR_ECC_521
 	if ((disable_unset_keys || ECDSA_DEFAULT_SIZE != 521)
 		&& !svr_opts.hostkey->ecckey521) {
 		disablekey(DROPBEAR_SIGNKEY_ECDSA_NISTP521);
--- a/svr-session.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-session.c	Thu May 18 23:45:10 2017 +0800
@@ -63,7 +63,7 @@
 	{SSH_MSG_CHANNEL_FAILURE, ignore_recv_response},
 	{SSH_MSG_REQUEST_FAILURE, ignore_recv_response}, /* for keepalive */
 	{SSH_MSG_REQUEST_SUCCESS, ignore_recv_response}, /* client */
-#ifdef USING_LISTENERS
+#if DROPBEAR_LISTENERS
 	{SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
 	{SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
 #endif
@@ -72,7 +72,7 @@
 
 static const struct ChanType *svr_chantypes[] = {
 	&svrchansess,
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 	&svr_chan_tcpdirect,
 #endif
 	NULL /* Null termination is mandatory. */
@@ -97,7 +97,7 @@
 
 	/* Initialise server specific parts of the session */
 	svr_ses.childpipe = childpipe;
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	svr_ses.server_pid = getpid();
 #endif
 	svr_authinitialise();
@@ -173,7 +173,7 @@
 
 	dropbear_log(LOG_INFO, "%s", fullmsg);
 
-#ifdef USE_VFORK
+#if DROPBEAR_VFORK
 	/* For uclinux only the main server process should cleanup - we don't want
 	 * forked children doing that */
 	if (svr_ses.server_pid == getpid())
@@ -222,7 +222,7 @@
 
 	/* if we are using DEBUG_TRACE, we want to print to stderr even if
 	 * syslog is used, so it is included in error reports */
-#ifdef DEBUG_TRACE
+#if DEBUG_TRACE
 	havetrace = debug_trace;
 #endif
 
--- a/svr-tcpfwd.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-tcpfwd.c	Thu May 18 23:45:10 2017 +0800
@@ -35,7 +35,7 @@
 #include "auth.h"
 #include "netio.h"
 
-#ifndef ENABLE_SVR_REMOTETCPFWD
+#ifndef DROPBEAR_SVR_REMOTETCPFWD
 
 /* This is better than SSH_MSG_UNIMPLEMENTED */
 void recv_msg_global_request_remotetcp() {
@@ -44,13 +44,13 @@
 }
 
 /* */
-#endif /* !ENABLE_SVR_REMOTETCPFWD */
+#endif /* !DROPBEAR_SVR_REMOTETCPFWD */
 
 static int svr_cancelremotetcp(void);
 static int svr_remotetcpreq(void);
 static int newtcpdirect(struct Channel * channel);
 
-#ifdef ENABLE_SVR_REMOTETCPFWD
+#if DROPBEAR_SVR_REMOTETCPFWD
 static const struct ChanType svr_chan_tcpremote = {
 	1, /* sepfds */
 	"forwarded-tcpip",
@@ -199,7 +199,7 @@
 	}
 	else
 	{
-		tcpinfo->listenaddr = request_addr;
+		tcpinfo->listenaddr = m_strdup(request_addr);
 	}
 
 	ret = listen_tcpfwd(tcpinfo);
@@ -215,9 +215,9 @@
 	return ret;
 }
 
-#endif /* ENABLE_SVR_REMOTETCPFWD */
+#endif /* DROPBEAR_SVR_REMOTETCPFWD */
 
-#ifdef ENABLE_SVR_LOCALTCPFWD
+#if DROPBEAR_SVR_LOCALTCPFWD
 
 const struct ChanType svr_chan_tcpdirect = {
 	1, /* sepfds */
@@ -283,4 +283,4 @@
 	return err;
 }
 
-#endif /* ENABLE_SVR_LOCALTCPFWD */
+#endif /* DROPBEAR_SVR_LOCALTCPFWD */
--- a/svr-x11fwd.c	Thu May 18 23:38:30 2017 +0800
+++ b/svr-x11fwd.c	Thu May 18 23:45:10 2017 +0800
@@ -24,7 +24,7 @@
 
 #include "includes.h"
 
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 #include "x11fwd.h"
 #include "session.h"
 #include "ssh.h"
--- a/sysoptions.h	Thu May 18 23:38:30 2017 +0800
+++ b/sysoptions.h	Thu May 18 23:45:10 2017 +0800
@@ -4,7 +4,7 @@
  *******************************************************************/
 
 #ifndef DROPBEAR_VERSION
-#define DROPBEAR_VERSION "2016.74"
+#define DROPBEAR_VERSION "2017.75"
 #endif
 
 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
@@ -23,14 +23,20 @@
 #define AUTH_TIMEOUT 300 /* we choose 5 minutes */
 #endif
 
+ #define DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT ((DROPBEAR_SVR_PUBKEY_AUTH) && (DROPBEAR_SVR_PUBKEY_OPTIONS))
+
 /* A client should try and send an initial key exchange packet guessing
  * the algorithm that will match - saves a round trip connecting, has little
  * overhead if the guess was "wrong". */
-#define USE_KEX_FIRST_FOLLOWS
+#ifndef DROPBEAR_KEX_FIRST_FOLLOWS
+#define DROPBEAR_KEX_FIRST_FOLLOWS 1
+#endif
 /* Use protocol extension to allow "first follows" to succeed more frequently.
  * This is currently Dropbear-specific but will gracefully fallback when connecting
  * to other implementations. */
-#define USE_KEXGUESS2
+#ifndef DROPBEAR_KEXGUESS2
+#define DROPBEAR_KEXGUESS2 1
+#endif
 
 /* Minimum key sizes for DSS and RSA */
 #ifndef MIN_DSS_KEYLEN
@@ -68,11 +74,11 @@
 /* success/failure defines */
 #define DROPBEAR_SUCCESS 0
 #define DROPBEAR_FAILURE -1
+ 
+#define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
 
 /* Required for pubkey auth */
-#if defined(ENABLE_SVR_PUBKEY_AUTH) || defined(DROPBEAR_CLIENT)
-#define DROPBEAR_SIGNKEY_VERIFY
-#endif
+#define DROPBEAR_SIGNKEY_VERIFY ((DROPBEAR_SVR_PUBKEY_AUTH) || (DROPBEAR_CLIENT))
 
 #define SHA1_HASH_SIZE 20
 #define MD5_HASH_SIZE 16
@@ -81,56 +87,45 @@
 #define MAX_KEY_LEN 32 /* 256 bits for aes256 etc */
 #define MAX_IV_LEN 20 /* must be same as max blocksize,  */
 
-#if defined(DROPBEAR_SHA2_512_HMAC)
+#if DROPBEAR_SHA2_512_HMAC
 #define MAX_MAC_LEN 64
-#elif defined(DROPBEAR_SHA2_256_HMAC)
+#elif DROPBEAR_SHA2_256_HMAC
 #define MAX_MAC_LEN 32
 #else
 #define MAX_MAC_LEN 20
 #endif
 
-#if defined(DROPBEAR_ECDH) || defined (DROPBEAR_ECDSA)
-#define DROPBEAR_ECC
+
+#define DROPBEAR_ECC ((DROPBEAR_ECDH) || (DROPBEAR_ECDSA))
+
 /* Debian doesn't define this in system headers */
-#ifndef LTM_DESC
-#define LTM_DESC
-#endif
+#if !defined(LTM_DESC) && (DROPBEAR_ECC)
+#define LTM_DESC 
 #endif
 
-#ifdef DROPBEAR_ECC
-#define DROPBEAR_ECC_256
-#define DROPBEAR_ECC_384
-#define DROPBEAR_ECC_521
-#endif
+#define DROPBEAR_ECC_256 (DROPBEAR_ECC)
+#define DROPBEAR_ECC_384 (DROPBEAR_ECC)
+#define DROPBEAR_ECC_521 (DROPBEAR_ECC)
 
-#ifdef DROPBEAR_ECC
-#define DROPBEAR_LTC_PRNG
-#endif
+#define DROPBEAR_LTC_PRNG (DROPBEAR_ECC)
 
 /* RSA can be vulnerable to timing attacks which use the time required for
  * signing to guess the private key. Blinding avoids this attack, though makes
  * signing operations slightly slower. */
-#define RSA_BLINDING
+#define DROPBEAR_RSA_BLINDING 1
 
 /* hashes which will be linked and registered */
-#if defined(DROPBEAR_SHA2_256_HMAC) || defined(DROPBEAR_ECC_256) || defined(DROPBEAR_CURVE25519) || DROPBEAR_DH_GROUP14
-#define DROPBEAR_SHA256
-#endif
-#if defined(DROPBEAR_ECC_384)
-#define DROPBEAR_SHA384
-#endif
+#define DROPBEAR_SHA256 ((DROPBEAR_SHA2_256_HMAC) || (DROPBEAR_ECC_256)  \
+ 			|| (DROPBEAR_CURVE25519) || (DROPBEAR_DH_GROUP14_SHA256))
+#define DROPBEAR_SHA384 (DROPBEAR_ECC_384)
 /* LTC SHA384 depends on SHA512 */
-#if defined(DROPBEAR_SHA2_512_HMAC) || defined(DROPBEAR_ECC_521) || defined(DROPBEAR_ECC_384) || DROPBEAR_DH_GROUP16
-#define DROPBEAR_SHA512
-#endif
-#if defined(DROPBEAR_MD5_HMAC)
-#define DROPBEAR_MD5
-#endif
+#define DROPBEAR_SHA512 ((DROPBEAR_SHA2_512_HMAC) || (DROPBEAR_ECC_521) \
+			|| (DROPBEAR_SHA384) || (DROPBEAR_DH_GROUP16))
+#define DROPBEAR_MD5 (DROPBEAR_MD5_HMAC)
 
-/* These are disabled in Dropbear 2016.73 by default since the spec 
-   draft-ietf-curdle-ssh-kex-sha2-02 is under development. */
-#define DROPBEAR_DH_GROUP14_256 0
-#define DROPBEAR_DH_GROUP16 0
+#define DROPBEAR_DH_GROUP14 ((DROPBEAR_DH_GROUP14_SHA256) || (DROPBEAR_DH_GROUP14_SHA1))
+
+#define DROPBEAR_NORMAL_DH ((DROPBEAR_DH_GROUP1) || (DROPBEAR_DH_GROUP14) || (DROPBEAR_DH_GROUP16))
 
 /* roughly 2x 521 bits */
 #define MAX_ECC_SIZE 140
@@ -182,65 +177,47 @@
 												auth */
 
 
-#if defined(DROPBEAR_AES256) || defined(DROPBEAR_AES128)
-#define DROPBEAR_AES
-#endif
+#define DROPBEAR_AES ((DROPBEAR_AES256) || (DROPBEAR_AES128))
 
-#if defined(DROPBEAR_TWOFISH256) || defined(DROPBEAR_TWOFISH128)
-#define DROPBEAR_TWOFISH
-#endif
+#define DROPBEAR_TWOFISH ((DROPBEAR_TWOFISH256) || (DROPBEAR_TWOFISH128))
 
-#ifndef ENABLE_X11FWD
-#define DISABLE_X11FWD
-#endif
+#define DROPBEAR_CLI_ANYTCPFWD ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD))
 
-#if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD)
-#define ENABLE_CLI_ANYTCPFWD 
-#endif
+#define DROPBEAR_TCP_ACCEPT ((DROPBEAR_CLI_LOCALTCPFWD) || (DROPBEAR_SVR_REMOTETCPFWD))
 
-#if defined(ENABLE_CLI_LOCALTCPFWD) || defined(ENABLE_SVR_REMOTETCPFWD)
-#define DROPBEAR_TCP_ACCEPT
-#endif
-
-#if defined(ENABLE_CLI_REMOTETCPFWD) || defined(ENABLE_CLI_LOCALTCPFWD) || \
-	defined(ENABLE_SVR_REMOTETCPFWD) || defined(ENABLE_SVR_LOCALTCPFWD) || \
-	defined(ENABLE_SVR_AGENTFWD) || defined(ENABLE_X11FWD)
-#define USING_LISTENERS
-#endif
+#define DROPBEAR_LISTENERS \
+   ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD) || \
+	(DROPBEAR_SVR_REMOTETCPFWD) || (DROPBEAR_SVR_LOCALTCPFWD) || \
+	(DROPBEAR_SVR_AGENTFWD) || (DROPBEAR_X11FWD))
 
-#if defined(ENABLE_CLI_NETCAT) && defined(ENABLE_CLI_PROXYCMD)
-#define ENABLE_CLI_MULTIHOP
-#endif
+#define DROPBEAR_CLI_MULTIHOP ((DROPBEAR_CLI_NETCAT) && (DROPBEAR_CLI_PROXYCMD))
 
-#if defined(ENABLE_CLI_AGENTFWD) || defined(DROPBEAR_PRNGD_SOCKET)
-#define ENABLE_CONNECT_UNIX
-#endif
+#define ENABLE_CONNECT_UNIX ((DROPBEAR_CLI_AGENTFWD) || (DROPBEAR_PRNGD_SOCKET))
 
-#if defined(DROPBEAR_CLIENT) || defined(ENABLE_SVR_PUBKEY_AUTH)
-#define DROPBEAR_KEY_LINES /* ie we're using authorized_keys or known_hosts */
-#endif
+/* if we're using authorized_keys or known_hosts */ 
+#define DROPBEAR_KEY_LINES ((DROPBEAR_CLIENT) || (DROPBEAR_SVR_PUBKEY_AUTH))
 
 /* Changing this is inadvisable, it appears to have problems
  * with flushing compressed data */
 #define DROPBEAR_ZLIB_MEM_LEVEL 8
 
-#if defined(ENABLE_SVR_PASSWORD_AUTH) && defined(ENABLE_SVR_PAM_AUTH)
+#if (DROPBEAR_SVR_PASSWORD_AUTH) && (DROPBEAR_SVR_PAM_AUTH)
 #error "You can't turn on PASSWORD and PAM auth both at once. Fix it in options.h"
 #endif
 
 /* We use dropbear_client and dropbear_server as shortcuts to avoid redundant
  * code, if we're just compiling as client or server */
-#if defined(DROPBEAR_SERVER) && defined(DROPBEAR_CLIENT)
+#if (DROPBEAR_SERVER) && (DROPBEAR_CLIENT)
 
 #define IS_DROPBEAR_SERVER (ses.isserver == 1)
 #define IS_DROPBEAR_CLIENT (ses.isserver == 0)
 
-#elif defined(DROPBEAR_SERVER)
+#elif DROPBEAR_SERVER
 
 #define IS_DROPBEAR_SERVER 1
 #define IS_DROPBEAR_CLIENT 0
 
-#elif defined(DROPBEAR_CLIENT)
+#elif DROPBEAR_CLIENT
 
 #define IS_DROPBEAR_SERVER 0
 #define IS_DROPBEAR_CLIENT 1
@@ -252,9 +229,11 @@
 
 #endif /* neither DROPBEAR_SERVER nor DROPBEAR_CLIENT */
 
-#ifndef HAVE_FORK
-#define USE_VFORK
-#endif  /* don't HAVE_FORK */
+#ifdef HAVE_FORK
+#define DROPBEAR_VFORK 0
+#else
+#define DROPBEAR_VFORK 1
+#endif
 
 #if MAX_UNAUTH_CLIENTS > MAX_CHANNELS
 #define DROPBEAR_LISTEN_BACKLOG MAX_UNAUTH_CLIENTS
@@ -262,8 +241,12 @@
 #define DROPBEAR_LISTEN_BACKLOG MAX_CHANNELS
 #endif
 
+#ifndef DROPBEAR_NONE_CIPHER
+#define DROPBEAR_NONE_CIPHER 0
+#endif
+
 /* free memory before exiting */
-#define DROPBEAR_CLEANUP
+#define DROPBEAR_CLEANUP 1
 
 /* Use this string since some implementations might special-case it */
 #define DROPBEAR_KEEPALIVE_STRING "[email protected]"
@@ -272,8 +255,11 @@
  * Currently server is enabled but client is disabled by default until there
  * is further compatibility testing */
 #ifdef __linux__
-#define DROPBEAR_SERVER_TCP_FAST_OPEN
-/* #define DROPBEAR_CLIENT_TCP_FAST_OPEN */
+#define DROPBEAR_SERVER_TCP_FAST_OPEN 1
+#define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
+#else
+#define DROPBEAR_SERVER_TCP_FAST_OPEN 0
+#define DROPBEAR_CLIENT_TCP_FAST_OPEN 0
 #endif
 
 /* no include guard for this file */
--- a/tcp-accept.c	Thu May 18 23:38:30 2017 +0800
+++ b/tcp-accept.c	Thu May 18 23:45:10 2017 +0800
@@ -33,7 +33,7 @@
 #include "listener.h"
 #include "runopts.h"
 
-#ifdef DROPBEAR_TCP_ACCEPT
+#if DROPBEAR_TCP_ACCEPT
 
 static void cleanup_tcp(struct Listener *listener) {
 
--- a/x11fwd.h	Thu May 18 23:38:30 2017 +0800
+++ b/x11fwd.h	Thu May 18 23:45:10 2017 +0800
@@ -23,7 +23,7 @@
  * SOFTWARE. */
 #ifndef DROPBEAR__X11FWD_H_
 #define DROPBEAR__X11FWD_H_
-#ifndef DISABLE_X11FWD
+#if DROPBEAR_X11FWD
 
 #include "includes.h"
 #include "chansession.h"