Add listening support.
This commit is contained in:
Matt Kraai
parent
df8ccb6350
commit
1d70267450
@ -959,9 +959,13 @@ const char mv_usage[] =
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#if defined BB_NC
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const char nc_usage[] =
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"nc [IP] [port]"
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"nc [-p PORT] IP PORT\n"
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" or: nc -l -p PORT"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\n\nNetcat opens a pipe to IP:port"
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"\n\nNetcat opens a pipe to IP:PORT\n"
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"Options:\n"
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"\t-l\tListen on the socket.\n"
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"\t-p PORT\tBind the local port to PORT."
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#endif
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;
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#endif
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@ -2452,7 +2452,12 @@
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</para>
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<para>
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Open a pipe to HOST:PORT.
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or: nc -p PORT -l
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</para>
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<para>
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Open a pipe to HOST:PORT or listen for a connection on PORT.
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</para>
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<para>
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54
nc.c
54
nc.c
@ -41,7 +41,7 @@
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int nc_main(int argc, char **argv)
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{
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int sfd;
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int do_listen = 0, lport = 0, tmpfd, opt, sfd;
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char buf[BUFSIZ];
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struct sockaddr_in address;
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@ -49,24 +49,54 @@ int nc_main(int argc, char **argv)
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fd_set readfds, testfds;
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argc--;
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argv++;
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if (argc < 2 || **argv == '-') {
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usage(nc_usage);
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while ((opt = getopt(argc, argv, "lp:")) > 0) {
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switch (opt) {
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case 'l':
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do_listen++;
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break;
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case 'p':
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lport = atoi(optarg);
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break;
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default:
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usage(nc_usage);
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}
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}
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if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
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usage(nc_usage);
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if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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perror_msg_and_die("socket");
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if ((hostinfo = gethostbyname(*argv)) == NULL)
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error_msg_and_die("cannot resolve %s", *argv);
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address.sin_family = AF_INET;
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address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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address.sin_port = htons(atoi(*(++argv)));
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if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("connect");
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if (lport != 0) {
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memset(&address.sin_addr, 0, sizeof(address.sin_addr));
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address.sin_port = htons(lport);
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if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("bind");
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}
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if (do_listen) {
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if (listen(sfd, 1) < 0)
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perror_msg_and_die("listen");
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if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
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perror_msg_and_die("accept");
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close(sfd);
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sfd = tmpfd;
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} else {
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if ((hostinfo = gethostbyname(argv[optind])) == NULL)
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error_msg_and_die("cannot resolve %s\n", argv[optind]);
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address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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address.sin_port = htons(atoi(argv[optind+1]));
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if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("connect");
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}
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FD_ZERO(&readfds);
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FD_SET(sfd, &readfds);
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@ -41,7 +41,7 @@
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int nc_main(int argc, char **argv)
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{
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int sfd;
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int do_listen = 0, lport = 0, tmpfd, opt, sfd;
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char buf[BUFSIZ];
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struct sockaddr_in address;
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@ -49,24 +49,54 @@ int nc_main(int argc, char **argv)
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fd_set readfds, testfds;
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argc--;
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argv++;
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if (argc < 2 || **argv == '-') {
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usage(nc_usage);
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while ((opt = getopt(argc, argv, "lp:")) > 0) {
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switch (opt) {
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case 'l':
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do_listen++;
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break;
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case 'p':
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lport = atoi(optarg);
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break;
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default:
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usage(nc_usage);
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}
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}
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if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
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usage(nc_usage);
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if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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perror_msg_and_die("socket");
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if ((hostinfo = gethostbyname(*argv)) == NULL)
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error_msg_and_die("cannot resolve %s", *argv);
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address.sin_family = AF_INET;
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address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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address.sin_port = htons(atoi(*(++argv)));
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if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("connect");
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if (lport != 0) {
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memset(&address.sin_addr, 0, sizeof(address.sin_addr));
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address.sin_port = htons(lport);
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if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("bind");
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}
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if (do_listen) {
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if (listen(sfd, 1) < 0)
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perror_msg_and_die("listen");
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if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
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perror_msg_and_die("accept");
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close(sfd);
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sfd = tmpfd;
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} else {
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if ((hostinfo = gethostbyname(argv[optind])) == NULL)
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error_msg_and_die("cannot resolve %s\n", argv[optind]);
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address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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address.sin_port = htons(atoi(argv[optind+1]));
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if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
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perror_msg_and_die("connect");
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}
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FD_ZERO(&readfds);
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FD_SET(sfd, &readfds);
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8
usage.c
8
usage.c
@ -959,9 +959,13 @@ const char mv_usage[] =
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#if defined BB_NC
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const char nc_usage[] =
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"nc [IP] [port]"
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"nc [-p PORT] IP PORT\n"
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" or: nc -l -p PORT"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\n\nNetcat opens a pipe to IP:port"
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"\n\nNetcat opens a pipe to IP:PORT\n"
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"Options:\n"
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"\t-l\tListen on the socket.\n"
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"\t-p PORT\tBind the local port to PORT."
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#endif
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;
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#endif
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