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Summary: Option to set SO_KEEPALIVE.
Contributor: Wes Chow <wes@senortoad.com>
Index: netcat-1.10/netcat.c
===================================================================
--- netcat-1.10.orig/netcat.c
+++ netcat-1.10/netcat.c
@@ -178,6 +178,7 @@ USHORT o_verbose = 0;
unsigned int o_wait = 0;
USHORT o_zero = 0;
int o_quit = -1; /* 0 == quit-now; >0 == quit after o_quit seconds */
+int o_keepalive = 0;
#ifdef IP_TOS
unsigned char o_tos = 0;
#endif
@@ -682,6 +683,13 @@ newskt:
holler ("nnetfd tos failed"); /* ??? */
}
#endif
+ if (o_keepalive) {
+ x = 1;
+ rr = setsockopt(nnetfd, SOL_SOCKET, SO_KEEPALIVE, &x, sizeof(x));
+ if (rr == -1) {
+ holler("nnetfd set keepalive failed");
+ }
+ }
#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
@@ -1501,7 +1509,7 @@ main (argc, argv)
/* 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:T:tuvw:z")) != EOF) {
+ while ((x = getopt (argc, argv, "abc:e:g:G:hi:klno:p:q:rs:T:tuvw:z")) != EOF) {
/* Debug (("in go: x now %c, optarg %x optind %d", x, optarg, optind)) */
switch (x) {
case 'a':
@@ -1548,6 +1556,8 @@ main (argc, argv)
if (! o_interval)
bail ("invalid interval time %s", optarg);
break;
+ case 'k':
+ o_keepalive = 1; break;
case 'l': /* listen mode */
o_listen++; break;
case 'n': /* numeric-only, no DNS lookups */
@@ -1800,6 +1810,7 @@ options:");
-G num source-routing pointer: 4, 8, 12, ...\n\
-h this cruft\n\
-i secs delay interval for lines sent, ports scanned\n\
+ -k set keepalive option on socket\n\
-l listen mode, for inbound connects\n\
-n numeric-only IP addresses, no DNS\n\
-o file hex dump of traffic\n\
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