--- jumpgate.c.orig	2002-11-30 05:00:12.000000000 +0800
+++ jumpgate.c	2009-10-20 14:29:14.000000000 +0800
@@ -25,10 +25,11 @@
  
  rec.latency_flag = rec.log_flag = rec.rport = lport = 0;
  rec.hostname = NULL;
+ rec.local_addr = htonl(INADDR_ANY);
  bind_addr = htonl(INADDR_ANY);
  opterr = 0;
  
- while((c = getopt(argc, argv, "hsvil:r:a:b:f:c:L:")) != -1)
+ while((c = getopt(argc, argv, "hsvil:r:a:b:f:c:L:B:")) != -1)
  {
   switch(c)
   {
@@ -112,6 +113,20 @@
    	}
    	
    	break; 
+   case 'B':
+   	if((rec.local_addr = inet_addr(optarg)) == INADDR_NONE)
+   	{
+   	 if((h_ent = gethostbyname(optarg)) != NULL)
+   	 {
+   	  memcpy(&rec.local_addr, h_ent->h_addr, sizeof(in_addr_t));
+   	 }
+   	 else
+   	 {
+   	  error_exit(0, "error: error resolving hostname for outbound binding");
+   	 }
+   	}
+   	break; 
+ 
    case 'f':
    	rec.log_flag = 1;
    	rec.logfile = optarg;
@@ -258,7 +273,7 @@
 {
  fprintf(stderr, "usage: %s [-hsvi] [-b <local host or IP address>] [-l <local port #>]\n", name);
  fprintf(stderr, "	[-r <remote port #>] [-a <remote host or IP address>] [-f <filename>]\n");
- fprintf(stderr, "	[-c <number of connections>] [-L <microseconds>]\n");
+ fprintf(stderr, "	[-c <number of connections>] [-L <microseconds>] [-B <local outbound IP address>]\n");
 }
 
 void
@@ -267,7 +282,7 @@
  fprintf(stderr, "\njumpgate v%s by Patroklos G. Argyroudis <argp@cs.tcd.ie>\n\n", VERSION);
  fprintf(stderr, "usage: %s [-hsvi] [-b <local host or IP address>] [-l <local port #>]\n", name);
  fprintf(stderr, "	[-r <remote port #>] [-a <remote host or IP address>] [-f <filename>]\n");
- fprintf(stderr, "	[-c <number of connections>] [-L <microseconds>]\n\n");
+ fprintf(stderr, "	[-c <number of connections>] [-L <microseconds>] [-B <local outbound IP address>]\n\n");
  fprintf(stderr, "-h		this help message\n");
  fprintf(stderr, "-s		log jumpgate use via syslog(3)\n");
  fprintf(stderr, "-v		display version number and exit\n");
@@ -278,7 +293,8 @@
  fprintf(stderr, "-a		specify the host to forward the connection\n"); 
  fprintf(stderr, "-f		specify the filename to log the connection\n");
  fprintf(stderr, "-c		specify the maximum number of the connections backlog\n");
- fprintf(stderr, "-L		specify the latency in microseconds\n\n");
+ fprintf(stderr, "-L		specify the latency in microseconds\n");
+ fprintf(stderr, "-B		specify the local outgoing IP Address to bind\n\n");
 }
 
 /* taken from "UNIX Network Programming" by W. Richard Stevens */ 
@@ -434,8 +450,13 @@
  int n, rfd;
  char buf[BUFSIZE];
  fd_set fdsr, fdse;
- struct sockaddr_in raddr;
+ struct sockaddr_in raddr, laddr;
  
+ bzero(&laddr, sizeof(laddr));
+ laddr.sin_family = AF_INET;
+ laddr.sin_addr.s_addr = jmp->local_addr;
+ laddr.sin_port = 0;
+
  if(jmp->log_flag == 1)
  {
   if((fp = fopen(jmp->logfile, "a+")) == NULL)
@@ -448,7 +469,11 @@
  {
   error_log(1, 1, LOG_ERR, "socket error");
  }
- 
+
+ if (bind(rfd, (struct sockaddr *) &laddr, sizeof(laddr)) < 0) {
+  error_exit(1, "bind outbound address error");
+ }
+
  raddr.sin_family = AF_INET;
  raddr.sin_port = htons(jmp->rport);
  memcpy(&raddr.sin_addr, &jmp->hostaddr, sizeof(in_addr_t));
--- jumpgate.h.orig	2002-11-30 05:00:12.000000000 +0800
+++ jumpgate.h	2009-10-20 14:25:17.000000000 +0800
@@ -43,6 +43,7 @@
  useconds_t latency;		/* latency in microseconds */
  char *hostname;		/* remote host name */
  in_addr_t hostaddr;		/* remote host address */
+ in_addr_t local_addr;          /* local outgoing address */
  int log_flag;
  int latency_flag;
  char *logfile;			/* name of the logfile */