--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/default_options.h.in	Fri Jul 22 00:08:02 2016 +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_ */