Missing dependency spotted by Robert P Day.

[oweals/busybox.git] / networking / nc.c

diff --git a/networking/nc.c b/networking/nc.c
index 9a353c94f81c7aa2c87652b7b6228e681bd6ebf4..85148c4a713be973ae535e64af84c5c7dcfc6578 100644 (file)
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -4,7 +4,7 @@
 
     0.0.1   6K      It works.
     0.0.2   5K      Smaller and you can also check the exit condition if you wish.
-    0.0.3          Uses select()
+    0.0.3           Uses select()
 
     19980918 Busy Boxed! Dave Cinege
     19990512 Uses Select. Charles P. Wright
@@ -23,13 +23,13 @@
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
 */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <signal.h>
 
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -40,14 +40,19 @@
 #include <sys/ioctl.h>
 #include "busybox.h"
 
-#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;
-       char buf[BUFSIZ];
-#ifdef GAPING_SECURITY_HOLE
-       char * pr00gie = NULL;
+       int do_listen = 0, lport = 0, delay = 0, wsecs = 0, tmpfd, opt, sfd, x;
+
+#define buf bb_common_bufsiz1
+
+#ifdef CONFIG_NC_GAPING_SECURITY_HOLE
+       char *pr00gie = NULL;
 #endif
 
        struct sockaddr_in address;
@@ -55,7 +60,7 @@ 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++;
@@ -66,34 +71,34 @@ int nc_main(int argc, char **argv)
                        case 'i':
                                delay = atoi(optarg);
                                break;
-#ifdef GAPING_SECURITY_HOLE
+#ifdef CONFIG_NC_GAPING_SECURITY_HOLE
                        case 'e':
                                pr00gie = optarg;
                                break;
 #endif
+                       case 'w':
+                               wsecs = atoi(optarg);
+                               break;
                        default:
                                bb_show_usage();
                }
        }
 
-#ifdef GAPING_SECURITY_HOLE
-       if (pr00gie) {
-               /* won't need stdin */
-               close (fileno(stdin));      
-       }
-#endif /* GAPING_SECURITY_HOLE */
-
-
        if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
                bb_show_usage();
 
        if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
                bb_perror_msg_and_die("socket");
        x = 1;
-       if (setsockopt (sfd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof (x)) == -1)
-               bb_perror_msg_and_die ("reuseaddr failed");
+       if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &x, sizeof (x)) == -1)
+               bb_perror_msg_and_die("reuseaddr");
        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;
@@ -123,19 +128,23 @@ int nc_main(int argc, char **argv)
                        bb_perror_msg_and_die("connect");
        }
 
-#ifdef GAPING_SECURITY_HOLE
+       if (wsecs) {
+               alarm(0);
+               signal(SIGALRM, SIG_DFL);
+       }
+
+#ifdef CONFIG_NC_GAPING_SECURITY_HOLE
        /* -e given? */
        if (pr00gie) {
                dup2(sfd, 0);
                close(sfd);
-               dup2 (0, 1);
-               dup2 (0, 2);
-               execl (pr00gie, pr00gie, NULL);
+               dup2(0, 1);
+               dup2(0, 2);
+               execl(pr00gie, pr00gie, NULL);
                /* Don't print stuff or it will go over the wire.... */
                _exit(-1);
        }
-#endif /* GAPING_SECURITY_HOLE */
-
+#endif /* CONFIG_NC_GAPING_SECURITY_HOLE */
 
        FD_ZERO(&readfds);
        FD_SET(sfd, &readfds);
@@ -154,20 +163,23 @@ int nc_main(int argc, char **argv)
                for (fd = 0; fd < FD_SETSIZE; fd++) {
                        if (FD_ISSET(fd, &testfds)) {
                                if ((nread = safe_read(fd, buf, sizeof(buf))) < 0)
-                                       bb_perror_msg_and_die("read");
+                                       bb_perror_msg_and_die(bb_msg_read_error);
 
                                if (fd == sfd) {
                                        if (nread == 0)
                                                exit(0);
                                        ofd = STDOUT_FILENO;
                                } else {
-                                       if (nread == 0)
-                                               shutdown(sfd, 1);
+                                       if (nread <= 0) {
+                                               shutdown(sfd, 1 /* send */ );
+                                               close(STDIN_FILENO);
+                                               FD_CLR(STDIN_FILENO, &readfds);
+                                       }
                                        ofd = sfd;
                                }
 
                                if (bb_full_write(ofd, buf, nread) < 0)
-                                       bb_perror_msg_and_die("write");
+                                       bb_perror_msg_and_die(bb_msg_write_error);
                                if (delay > 0) {
                                        sleep(delay);
                                }