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- Add option to change zlib windowBits/memLevel

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--HG--
extra : convert_revision : 5fc51ba0b8f165426c78f8d32162e5ccb51e524f
This commit is contained in:
Matt Johnston 2009-07-26 15:39:47 +00:00
parent 8181d41bb5
commit 3608775306
2 changed files with 24 additions and 1 deletions
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4
common-kex.c
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@ -371,7 +371,9 @@ static void gen_new_zstreams() {
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");
}

21
options.h
View File

@ -130,6 +130,21 @@ much traffic. */
* 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 @@ much traffic. */
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 */