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function old new delta nc_main 933 946 +13 Signed-off-by: Tomoya Adachi <adachi@il.is.s.u-tokyo.ac.jp> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
203 lines
5.2 KiB
C
203 lines
5.2 KiB
C
/* vi: set sw=4 ts=4: */
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/* nc: mini-netcat - built from the ground up for LRP
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*
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* Copyright (C) 1998, 1999 Charles P. Wright
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* Copyright (C) 1998 Dave Cinege
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#if ENABLE_DESKTOP
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#include "nc_bloaty.c"
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#else
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/* Lots of small differences in features
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* when compared to "standard" nc
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*/
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static void timeout(int signum UNUSED_PARAM)
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{
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bb_error_msg_and_die("timed out");
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}
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int nc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nc_main(int argc, char **argv)
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{
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/* sfd sits _here_ only because of "repeat" option (-l -l). */
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int sfd = sfd; /* for gcc */
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int cfd = 0;
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unsigned lport = 0;
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IF_NOT_NC_SERVER(const) unsigned do_listen = 0;
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IF_NOT_NC_EXTRA (const) unsigned wsecs = 0;
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IF_NOT_NC_EXTRA (const) unsigned delay = 0;
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IF_NOT_NC_EXTRA (const int execparam = 0;)
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IF_NC_EXTRA (char **execparam = NULL;)
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fd_set readfds, testfds;
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int opt; /* must be signed (getopt returns -1) */
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if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) {
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/* getopt32 is _almost_ usable:
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** it cannot handle "... -e prog -prog-opt" */
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while ((opt = getopt(argc, argv,
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"" IF_NC_SERVER("lp:") IF_NC_EXTRA("w:i:f:e:") )) > 0
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) {
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if (ENABLE_NC_SERVER && opt == 'l')
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IF_NC_SERVER(do_listen++);
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else if (ENABLE_NC_SERVER && opt == 'p')
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IF_NC_SERVER(lport = bb_lookup_port(optarg, "tcp", 0));
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else if (ENABLE_NC_EXTRA && opt == 'w')
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IF_NC_EXTRA( wsecs = xatou(optarg));
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else if (ENABLE_NC_EXTRA && opt == 'i')
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IF_NC_EXTRA( delay = xatou(optarg));
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else if (ENABLE_NC_EXTRA && opt == 'f')
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IF_NC_EXTRA( cfd = xopen(optarg, O_RDWR));
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else if (ENABLE_NC_EXTRA && opt == 'e' && optind <= argc) {
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/* We cannot just 'break'. We should let getopt finish.
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** Or else we won't be able to find where
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** 'host' and 'port' params are
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** (think "nc -w 60 host port -e prog"). */
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IF_NC_EXTRA(
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char **p;
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// +2: one for progname (optarg) and one for NULL
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execparam = xzalloc(sizeof(char*) * (argc - optind + 2));
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p = execparam;
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*p++ = optarg;
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while (optind < argc) {
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*p++ = argv[optind++];
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}
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)
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/* optind points to argv[arvc] (NULL) now.
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** FIXME: we assume that getopt will not count options
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** possibly present on "-e prog args" and will not
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** include them into final value of optind
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** which is to be used ... */
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} else bb_show_usage();
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}
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argv += optind; /* ... here! */
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argc -= optind;
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// -l and -f don't mix
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if (do_listen && cfd) bb_show_usage();
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// File mode needs need zero arguments, listen mode needs zero or one,
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// client mode needs one or two
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if (cfd) {
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if (argc) bb_show_usage();
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} else if (do_listen) {
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if (argc > 1) bb_show_usage();
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} else {
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if (!argc || argc > 2) bb_show_usage();
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}
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} else {
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if (argc != 3) bb_show_usage();
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argc--;
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argv++;
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}
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if (wsecs) {
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signal(SIGALRM, timeout);
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alarm(wsecs);
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}
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if (!cfd) {
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if (do_listen) {
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sfd = create_and_bind_stream_or_die(argv[0], lport);
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xlisten(sfd, do_listen); /* can be > 1 */
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#if 0 /* nc-1.10 does not do this (without -v) */
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/* If we didn't specify a port number,
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* query and print it after listen() */
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if (!lport) {
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len_and_sockaddr lsa;
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lsa.len = LSA_SIZEOF_SA;
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getsockname(sfd, &lsa.u.sa, &lsa.len);
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lport = get_nport(&lsa.u.sa);
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fdprintf(2, "%d\n", ntohs(lport));
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}
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#endif
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close_on_exec_on(sfd);
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accept_again:
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cfd = accept(sfd, NULL, 0);
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if (cfd < 0)
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bb_perror_msg_and_die("accept");
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if (!execparam)
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close(sfd);
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} else {
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cfd = create_and_connect_stream_or_die(argv[0],
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argv[1] ? bb_lookup_port(argv[1], "tcp", 0) : 0);
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}
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}
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if (wsecs) {
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alarm(0);
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/* Non-ignored signals revert to SIG_DFL on exec anyway */
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/*signal(SIGALRM, SIG_DFL);*/
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}
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/* -e given? */
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if (execparam) {
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pid_t pid;
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/* With more than one -l, repeatedly act as server */
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if (do_listen > 1 && (pid = vfork()) != 0) {
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/* parent or error */
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if (pid < 0)
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bb_perror_msg_and_die("vfork");
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/* prevent zombies */
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signal(SIGCHLD, SIG_IGN);
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close(cfd);
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goto accept_again;
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}
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/* child, or main thread if only one -l */
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xmove_fd(cfd, 0);
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xdup2(0, 1);
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xdup2(0, 2);
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IF_NC_EXTRA(BB_EXECVP(execparam[0], execparam);)
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/* Don't print stuff or it will go over the wire... */
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_exit(127);
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}
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/* Select loop copying stdin to cfd, and cfd to stdout */
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FD_ZERO(&readfds);
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FD_SET(cfd, &readfds);
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FD_SET(STDIN_FILENO, &readfds);
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for (;;) {
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int fd;
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int ofd;
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int nread;
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testfds = readfds;
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if (select(cfd + 1, &testfds, NULL, NULL, NULL) < 0)
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bb_perror_msg_and_die("select");
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#define iobuf bb_common_bufsiz1
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fd = STDIN_FILENO;
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while (1) {
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if (FD_ISSET(fd, &testfds)) {
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nread = safe_read(fd, iobuf, sizeof(iobuf));
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if (fd == cfd) {
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if (nread < 1)
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exit(EXIT_SUCCESS);
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ofd = STDOUT_FILENO;
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} else {
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if (nread < 1) {
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/* Close outgoing half-connection so they get EOF,
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* but leave incoming alone so we can see response */
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shutdown(cfd, 1);
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FD_CLR(STDIN_FILENO, &readfds);
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}
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ofd = cfd;
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}
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xwrite(ofd, iobuf, nread);
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if (delay > 0)
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sleep(delay);
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}
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if (fd == cfd)
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break;
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fd = cfd;
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}
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}
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}
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#endif
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