In bug 247, haveaniceday writes:

The option "-w secs" adds a timeout for writing.

1 files changed, 21 insertions, 2 deletions

diff --git a/networking/nc.c b/networking/nc.c
index 3099763b1..bbcbc0d13 100644
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -30,6 +30,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <signal.h>
 
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -42,9 +43,14 @@
 
 #define GAPING_SECURITY_HOLE
 
+static void timeout(int signum)
+{
+        bb_error_msg_and_die("Timed out");
+}
+
 int nc_main(int argc, char **argv)
 {
-        int do_listen = 0, lport = 0, delay = 0, tmpfd, opt, sfd, x;
+        int do_listen = 0, lport = 0, delay = 0, wsecs = 0, tmpfd, opt, sfd, x;
         char buf[BUFSIZ];
 #ifdef GAPING_SECURITY_HOLE
         char * pr00gie = NULL;
@@ -55,7 +61,7 @@ int nc_main(int argc, char **argv)
 
         fd_set readfds, testfds;
 
-        while ((opt = getopt(argc, argv, "lp:i:e:")) > 0) {
+        while ((opt = getopt(argc, argv, "lp:i:e:w:")) > 0) {
                 switch (opt) {
                         case 'l':
                                 do_listen++;
@@ -71,6 +77,9 @@ int nc_main(int argc, char **argv)
                                 pr00gie = optarg;
                                 break;
 #endif
+                        case 'w':
+                                wsecs = atoi(optarg);
+                                break;
                         default:
                                 bb_show_usage();
                 }
@@ -94,6 +103,11 @@ int nc_main(int argc, char **argv)
                 bb_perror_msg_and_die ("reuseaddr failed");
         address.sin_family = AF_INET;
 
+        if (wsecs) {
+                signal(SIGALRM, timeout);
+                alarm(wsecs);
+        }
+
         if (lport != 0) {
                 memset(&address.sin_addr, 0, sizeof(address.sin_addr));
                 address.sin_port = lport;
@@ -123,6 +137,11 @@ int nc_main(int argc, char **argv)
                         bb_perror_msg_and_die("connect");
         }
 
+        if (wsecs) {
+                alarm(0);
+                signal(SIGALRM, SIG_DFL);
+        }
+
 #ifdef GAPING_SECURITY_HOLE
         /* -e given? */
         if (pr00gie) {