Summary: Add type-of-service option.
Contributor: Samuel Thibault <samuel.thibault@ens-lyon.org>

Index: netcat-1.10/netcat.c
===================================================================
--- netcat-1.10.orig/netcat.c	2008-02-25 19:01:50.000000000 -0500
+++ netcat-1.10/netcat.c	2008-06-19 16:46:10.000000000 -0400
@@ -178,6 +178,9 @@
 unsigned int o_wait = 0;
 USHORT o_zero = 0;
 int o_quit = -1; /* 0 == quit-now; >0 == quit after o_quit seconds */
+#ifdef IP_TOS
+unsigned char o_tos = 0;
+#endif
 /* o_tn in optional section */
 
 /* Debug macro: squirt whatever message and sleep a bit so we can see it go
@@ -672,6 +675,13 @@
   if (rr == -1)
     holler ("nnetfd reuseport failed");		/* ??? */
 #endif
+#ifdef IP_TOS
+  if (o_tos) {
+    rr = setsockopt (nnetfd, SOL_IP, IP_TOS, &o_tos, sizeof(o_tos));
+    if (rr == -1)
+    holler ("nnetfd tos failed");		/* ??? */
+  }
+#endif
 #if 0
 /* If you want to screw with RCVBUF/SNDBUF, do it here.  Liudvikas Bukys at
    Rochester sent this example, which would involve YET MORE options and is
@@ -1491,7 +1501,7 @@
 
 /* If your shitbox doesn't have getopt, step into the nineties already. */
 /* optarg, optind = next-argv-component [i.e. flag arg]; optopt = last-char */
-  while ((x = getopt (argc, argv, "abc:e:g:G:hi:lno:p:q:rs:tuvw:z")) != EOF) {
+  while ((x = getopt (argc, argv, "abc:e:g:G:hi:lno:p:q:rs:T:tuvw:z")) != EOF) {
 /* Debug (("in go: x now %c, optarg %x optind %d", x, optarg, optind)) */
     switch (x) {
       case 'a':
@@ -1577,6 +1587,20 @@
 	timer2 = (struct timeval *) Hmalloc (sizeof (struct timeval));
 	timer1->tv_sec = o_wait;	/* we need two.  see readwrite()... */
 	break;
+#ifdef IP_TOS
+      case 'T':
+	if (!strcmp(optarg, "Minimize-Delay"))
+	  o_tos = IPTOS_LOWDELAY;
+	else if (!strcmp(optarg, "Maximize-Throughput"))
+	  o_tos = IPTOS_THROUGHPUT;
+	else if (!strcmp(optarg, "Maximize-Reliability"))
+	  o_tos = IPTOS_RELIABILITY;
+	else if (!strcmp(optarg, "Minimize-Cost"))
+	  o_tos = IPTOS_MINCOST;
+	else
+	  o_tos = atoi(optarg);;
+	break;
+#endif
       case 'z':				/* little or no data xfer */
 	o_zero++;
 	break;
@@ -1783,6 +1807,10 @@
 	-r			randomize local and remote ports\n\
 	-q secs			quit after EOF on stdin and delay of secs\n\
 	-s addr			local source address");
+#ifdef IP_TOS
+  holler("\
+	-T tos			set Type Of Service");
+#endif
 #ifdef TELNET
   holler ("\
 	-t			answer TELNET negotiation");