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changeset 555:daf52f813328

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- Add option to change zlib windowBits/memLevel
author Matt Johnston <matt@ucc.asn.au>
date Sun, 26 Jul 2009 15:39:47 +0000
parents 1d5a3df28b53
children ccdc4c6183c0
files common-kex.c options.h
diffstat 2 files changed, 24 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/common-kex.c	Fri Jul 24 13:49:07 2009 +0000
+++ b/common-kex.c	Sun Jul 26 15:39:47 2009 +0000
@@ -371,7 +371,9 @@
 		ses.newkeys->trans.zstream->zalloc = Z_NULL;
 		ses.newkeys->trans.zstream->zfree = Z_NULL;
 	
-		if (deflateInit(ses.newkeys->trans.zstream, Z_DEFAULT_COMPRESSION) 
+		if (deflateInit2(ses.newkeys->trans.zstream, Z_DEFAULT_COMPRESSION,
+					Z_DEFLATED, DROPBEAR_ZLIB_WINDOW_BITS, 
+					DROPBEAR_ZLIB_MEM_LEVEL, Z_DEFAULT_STRATEGY)
 				!= Z_OK) {
 			dropbear_exit("zlib error");
 		}
--- a/options.h	Fri Jul 24 13:49:07 2009 +0000
+++ b/options.h	Sun Jul 26 15:39:47 2009 +0000
@@ -130,6 +130,21 @@
  * if the random number source isn't good. In general this isn't required */
 /* #define DSS_PROTOK */
 
+/* Control the memory/performance/compression tradeoff for zlib.
+ * Set windowBits=8, memLevel=1 for least memory usage, see your system's
+ * zlib.h for full details.
+ * Default settings (windowBits=15, memLevel=8) will use 
+ * 256kB for compression + 32kB for decompression.
+ * windowBits=8, memLevel=1 will use 10kB compression + 32kB decompression.
+ * Note that windowBits is only set for deflate() - inflate() always uses the
+ * default of 15 so as to interoperate with other clients. */
+#ifndef DROPBEAR_ZLIB_WINDOW_BITS
+#define DROPBEAR_ZLIB_WINDOW_BITS 15 
+#endif
+#ifndef DROPBEAR_ZLIB_MEM_LEVEL
+#define DROPBEAR_ZLIB_MEM_LEVEL 8
+#endif
+
 /* Whether to do reverse DNS lookups. */
 #define DO_HOST_LOOKUP
 
@@ -248,13 +263,19 @@
    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 */