[BusyBox] nc listening support
Matt Kraai
kraai at alumni.carnegiemellon.edu
Sun Dec 17 17:22:20 UTC 2000
On Sun, Dec 17, 2000 at 08:43:39AM -0800, Matt Kraai wrote:
> OK to commit?
Here is an updated patch which fixes the usage information and
checks for extra/missing arguments.
Matt
-------------- next part --------------
Index: nc.c
===================================================================
RCS file: /var/cvs/busybox/nc.c,v
retrieving revision 1.8
diff -u -r1.8 nc.c
--- nc.c 2000/12/15 22:34:34 1.8
+++ nc.c 2000/12/17 17:22:08
@@ -40,7 +40,7 @@
int nc_main(int argc, char **argv)
{
- int sfd;
+ int do_listen = 0, lport = 0, tmpfd, opt, sfd;
char buf[BUFSIZ];
struct sockaddr_in address;
@@ -48,24 +48,54 @@
fd_set readfds, testfds;
- argc--;
- argv++;
- if (argc < 2 || **argv == '-') {
- usage(nc_usage);
+ while ((opt = getopt(argc, argv, "lp:")) > 0) {
+ switch (opt) {
+ case 'l':
+ do_listen++;
+ break;
+ case 'p':
+ lport = atoi(optarg);
+ break;
+ default:
+ usage(nc_usage);
+ }
}
+ if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
+ usage(nc_usage);
+
if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
perror_msg_and_die("socket");
- if ((hostinfo = gethostbyname(*argv)) == NULL)
- error_msg_and_die("cannot resolve %s\n", *argv);
-
address.sin_family = AF_INET;
- address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
- address.sin_port = htons(atoi(*(++argv)));
+
+ if (lport != 0) {
+ memset(&address.sin_addr, 0, sizeof(address.sin_addr));
+ address.sin_port = htons(lport);
- if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
- perror_msg_and_die("connect");
+ if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
+ perror_msg_and_die("bind");
+ }
+
+ if (do_listen) {
+ if (listen(sfd, 1) < 0)
+ perror_msg_and_die("listen");
+
+ if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
+ perror_msg_and_die("accept");
+
+ close(sfd);
+ sfd = tmpfd;
+ } else {
+ if ((hostinfo = gethostbyname(argv[optind])) == NULL)
+ error_msg_and_die("cannot resolve %s\n", argv[optind]);
+
+ address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
+ address.sin_port = htons(atoi(argv[optind+1]));
+
+ if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
+ perror_msg_and_die("connect");
+ }
FD_ZERO(&readfds);
FD_SET(sfd, &readfds);
Index: usage.c
===================================================================
RCS file: /var/cvs/busybox/usage.c,v
retrieving revision 1.41
diff -u -r1.41 usage.c
--- usage.c 2000/12/13 17:59:37 1.41
+++ usage.c 2000/12/17 17:22:51
@@ -900,9 +900,13 @@
#if defined BB_NC
const char nc_usage[] =
- "nc [IP] [port]\n"
+ "nc [-p PORT] IP PORT\n"
+ " or: nc -l -p PORT\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nNetcat opens a pipe to IP:port\n"
+ "\nNetcat opens a pipe to IP:PORT\n"
+ "Options:\n"
+ "\t-l\tListen on the socket.\n"
+ "\t-p PORT\tBind the local port to PORT.\n"
#endif
;
#endif
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 232 bytes
Desc: not available
Url : http://lists.busybox.net/pipermail/busybox/attachments/20001217/2dea6c5e/attachment.pgp
More information about the busybox
mailing list