propagate from branch 'au.asn.ucc.matt.dropbear' (head bbe4e11695a7b22bd89a722600eb4a4020b6fdf3)

to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 276cf5e82276b6c879d246ba64739ec6868f5150)

--HG--
branch : agent-client
extra : convert_revision : d23b0c21649eb2f0b2d13dbf33c0a9faca25628a

common-kex.c

@@ -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");
 		}

options.h

@@ -87,7 +87,8 @@ much traffic. */
 #define DROPBEAR_AES128
 #define DROPBEAR_3DES
 #define DROPBEAR_AES256
-#define DROPBEAR_BLOWFISH
+/* Compiling in Blowfish will add ~6kB to runtime heap memory usage */
+/*#define DROPBEAR_BLOWFISH*/
 #define DROPBEAR_TWOFISH256
 #define DROPBEAR_TWOFISH128
 
@@ -130,6 +131,21 @@ 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 +264,19 @@ 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 */

packet.c

@@ -261,7 +261,7 @@ void decrypt_packet() {
 		
 	/* payload length */
 	/* - 4 - 1 is for LEN and PADLEN values */
-	len = ses.readbuf->len - padlen - 4 - 1;
+	len = ses.readbuf->len - padlen - 4 - 1 - macsize;
 	if ((len > RECV_MAX_PAYLOAD_LEN) || (len < 1)) {
 		dropbear_exit("bad packet size");
 	}

session.h

@@ -213,6 +213,10 @@ struct serversession {
 	/* The numeric address they connected from, used for logging */
 	char * addrstring;
 
+#ifdef __uClinux__
+	pid_t server_pid;
+#endif
+
 };
 
 typedef enum {

svr-session.c

@@ -85,6 +85,10 @@ void svr_session(int sock, int childpipe,
 	/* Initialise server specific parts of the session */
 	svr_ses.childpipe = childpipe;
 	svr_ses.addrstring = addrstring;
+#ifdef __uClinux__
+	svr_ses.server_pid = getpid();
+#endif
+	svr_ses.addrstring = addrstring;
 	svr_authinitialise();
 	chaninitialise(svr_chantypes);
 	svr_chansessinitialise();
@@ -144,11 +148,20 @@ void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
 
 	_dropbear_log(LOG_INFO, fmtbuf, param);
 
+#ifdef __uClinux__
+	/* only the main server process should cleanup - we don't want
+	 * forked children doing that */
+	if (svr_ses.server_pid == getpid())
+#else
+	if (1)
+#endif
+	{
 		/* free potential public key options */
 		svr_pubkey_options_cleanup();
 
 		/* must be after we've done with username etc */
 		common_session_cleanup();
+	}
 
 	exit(exitcode);