Remove code for protocols we don't properly support. (Most of this could

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

diff --git a/networking/nc.c b/networking/nc.c
index bbcbc0d13e5a75067a2420035a0e99130daa7d99..57b0917442d2513ffbd25f844a15fef94673fa5a 100644 (file)
--- a/networking/nc.c
+++ b/networking/nc.c
@@ -4,26 +4,13 @@
 
     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
     19990513 Fixes stdin stupidity and uses buffers.  Charles P. Wright
 
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    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.
-
+    Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */
 
 #include <stdio.h>
@@ -41,8 +28,6 @@
 #include <sys/ioctl.h>
 #include "busybox.h"
 
-#define GAPING_SECURITY_HOLE
-
 static void timeout(int signum)
 {
        bb_error_msg_and_die("Timed out");
@@ -51,9 +36,11 @@ static void timeout(int signum)
 int nc_main(int argc, char **argv)
 {
        int do_listen = 0, lport = 0, delay = 0, wsecs = 0, tmpfd, opt, sfd, x;
-       char buf[BUFSIZ];
-#ifdef GAPING_SECURITY_HOLE
-       char * pr00gie = NULL;
+
+#define buf bb_common_bufsiz1
+
+#ifdef CONFIG_NC_GAPING_SECURITY_HOLE
+       char *pr00gie = NULL;
 #endif
 
        struct sockaddr_in address;
@@ -72,7 +59,7 @@ 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;
@@ -85,22 +72,13 @@ int nc_main(int argc, char **argv)
                }
        }
 
-#ifdef GAPING_SECURITY_HOLE
-       if (pr00gie) {
-               /* won't need stdin */
-               close (STDIN_FILENO);      
-       }
-#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");
+       sfd = bb_xsocket(AF_INET, SOCK_STREAM, 0);
        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) {
@@ -112,16 +90,13 @@ int nc_main(int argc, char **argv)
                memset(&address.sin_addr, 0, sizeof(address.sin_addr));
                address.sin_port = lport;
 
-               if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
-                       bb_perror_msg_and_die("bind");
+               bb_xbind(sfd, (struct sockaddr *) &address, sizeof(address));
        }
 
        if (do_listen) {
                socklen_t addrlen = sizeof(address);
 
-               if (listen(sfd, 1) < 0)
-                       bb_perror_msg_and_die("listen");
-
+               bb_xlisten(sfd, 1);
                if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
                        bb_perror_msg_and_die("accept");
 
@@ -142,19 +117,18 @@ int nc_main(int argc, char **argv)
                signal(SIGALRM, SIG_DFL);
        }
 
-#ifdef GAPING_SECURITY_HOLE
+#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);
@@ -173,20 +147,23 @@ 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);
                                }