/* vi: set sw=4 ts=4: */
/* nc: mini-netcat - built from the ground up for LRP
- *
+ *
* Copyright (C) 1998, 1999 Charles P. Wright
* Copyright (C) 1998 Dave Cinege
- *
+ *
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include "busybox.h"
+#include "libbb.h"
-static void timeout(int signum)
+#if ENABLE_DESKTOP
+#include "nc_bloaty.c"
+#else
+
+/* Lots of small differences in features
+ * when compared to "standard" nc
+ */
+
+static void timeout(int signum ATTRIBUTE_UNUSED)
{
- bb_error_msg_and_die("Timed out");
+ bb_error_msg_and_die("timed out");
}
+int nc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int nc_main(int argc, char **argv)
{
- int do_listen = 0, lport = 0, delay = 0, wsecs = 0, execflag = 0, opt,
- sfd = 0, cfd;
- struct sockaddr_in address;
- struct hostent *hostinfo;
+ /* sfd sits _here_ only because of "repeat" option (-l -l). */
+ int sfd = sfd; /* for gcc */
+ int cfd = 0;
+ unsigned lport = 0;
+ SKIP_NC_SERVER(const) unsigned do_listen = 0;
+ SKIP_NC_EXTRA (const) unsigned wsecs = 0;
+ SKIP_NC_EXTRA (const) unsigned delay = 0;
+ SKIP_NC_EXTRA (const int execparam = 0;)
+ USE_NC_EXTRA (char **execparam = NULL;)
+ len_and_sockaddr *lsa;
fd_set readfds, testfds;
- char *infile = NULL;
-
- memset(&address, 0, sizeof(address));
-
- if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) {
- while ((opt = getopt(argc, argv, "lp:" USE_NC_EXTRA("i:ew:f:"))) > 0) {
- if (ENABLE_NC_SERVER && opt=='l') do_listen++;
+ int opt; /* must be signed (getopt returns -1) */
+
+ if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) {
+ /* getopt32 is _almost_ usable:
+ ** it cannot handle "... -e prog -prog-opt" */
+ while ((opt = getopt(argc, argv,
+ "" USE_NC_SERVER("lp:") USE_NC_EXTRA("w:i:f:e:") )) > 0
+ ) {
+ if (ENABLE_NC_SERVER && opt=='l')
+ USE_NC_SERVER(do_listen++);
else if (ENABLE_NC_SERVER && opt=='p')
- lport = bb_lookup_port(optarg, "tcp", 0);
- else if (ENABLE_NC_EXTRA && opt=='w') wsecs = atoi(optarg);
- else if (ENABLE_NC_EXTRA && opt=='i') delay = atoi(optarg);
- else if (ENABLE_NC_EXTRA && opt=='f') infile = optarg;
- else if (ENABLE_NC_EXTRA && opt=='e' && optind!=argc) {
- execflag++;
- break;
+ USE_NC_SERVER(lport = bb_lookup_port(optarg, "tcp", 0));
+ else if (ENABLE_NC_EXTRA && opt=='w')
+ USE_NC_EXTRA( wsecs = xatou(optarg));
+ else if (ENABLE_NC_EXTRA && opt=='i')
+ USE_NC_EXTRA( delay = xatou(optarg));
+ else if (ENABLE_NC_EXTRA && opt=='f')
+ USE_NC_EXTRA( cfd = xopen(optarg, O_RDWR));
+ else if (ENABLE_NC_EXTRA && opt=='e' && optind <= argc) {
+ /* We cannot just 'break'. We should let getopt finish.
+ ** Or else we won't be able to find where
+ ** 'host' and 'port' params are
+ ** (think "nc -w 60 host port -e prog"). */
+ USE_NC_EXTRA(
+ char **p;
+ // +2: one for progname (optarg) and one for NULL
+ execparam = xzalloc(sizeof(char*) * (argc - optind + 2));
+ p = execparam;
+ *p++ = optarg;
+ while (optind < argc) {
+ *p++ = argv[optind++];
+ }
+ )
+ /* optind points to argv[arvc] (NULL) now.
+ ** FIXME: we assume that getopt will not count options
+ ** possibly present on "-e prog args" and will not
+ ** include them into final value of optind
+ ** which is to be used ... */
} else bb_show_usage();
}
+ argv += optind; /* ... here! */
+ argc -= optind;
+ // -l and -f don't mix
+ if (do_listen && cfd) bb_show_usage();
+ // Listen or file modes need zero arguments, client mode needs 2
+ if (do_listen || cfd) {
+ if (argc) bb_show_usage();
+ } else {
+ if (!argc || argc > 2) bb_show_usage();
+ }
+ } else {
+ if (argc != 3) bb_show_usage();
+ argc--;
+ argv++;
}
-
- // For listen or file we need zero arguments, dialout is 2.
- // For exec we need at least one more argument at the end, more ok
-
- opt = (do_listen || infile) ? 0 : 2 + execflag;
- if (execflag ? argc-optind < opt : argc-optind!=opt ||
- (infile && do_listen))
- bb_show_usage();
-
if (wsecs) {
signal(SIGALRM, timeout);
alarm(wsecs);
}
-
- if (infile) cfd = xopen(infile, O_RDWR);
- else {
- opt = 1;
- sfd = xsocket(AF_INET, SOCK_STREAM, 0);
- fcntl(sfd, F_SETFD, FD_CLOEXEC);
- setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof (opt));
- address.sin_family = AF_INET;
-
- // Set local port.
-
- if (lport != 0) {
- address.sin_port = lport;
-
- xbind(sfd, (struct sockaddr *) &address, sizeof(address));
- }
+ if (!cfd) {
if (do_listen) {
- socklen_t addrlen = sizeof(address);
-
- xlisten(sfd, do_listen);
-
- // If we didn't specify a port number, query and print it to stderr.
-
+ /* create_and_bind_stream_or_die(NULL, lport)
+ * would've work wonderfully, but we need
+ * to know lsa */
+ sfd = xsocket_stream(&lsa);
+ if (lport)
+ set_nport(lsa, htons(lport));
+ setsockopt_reuseaddr(sfd);
+ xbind(sfd, &lsa->u.sa, lsa->len);
+ xlisten(sfd, do_listen); /* can be > 1 */
+ /* If we didn't specify a port number,
+ * query and print it after listen() */
if (!lport) {
- socklen_t len = sizeof(address);
- getsockname(sfd, &address, &len);
- fdprintf(2, "%d\n", SWAP_BE16(address.sin_port));
+ socklen_t addrlen = lsa->len;
+ getsockname(sfd, &lsa->u.sa, &addrlen);
+ lport = get_nport(&lsa->u.sa);
+ fdprintf(2, "%d\n", ntohs(lport));
}
-repeatyness:
- if ((cfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
+ close_on_exec_on(sfd);
+ accept_again:
+ cfd = accept(sfd, NULL, 0);
+ if (cfd < 0)
bb_perror_msg_and_die("accept");
-
- if (!execflag) close(sfd);
+ if (!execparam)
+ close(sfd);
} else {
- hostinfo = xgethostbyname(argv[optind]);
-
- address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
- address.sin_port = bb_lookup_port(argv[optind+1], "tcp", 0);
-
- if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
- bb_perror_msg_and_die("connect");
- cfd = sfd;
+ cfd = create_and_connect_stream_or_die(argv[0],
+ argv[1] ? bb_lookup_port(argv[1], "tcp", 0) : 0);
}
}
}
/* -e given? */
- if (execflag) {
- if(cfd) {
- signal(SIGCHLD, SIG_IGN);
- dup2(cfd, 0);
- close(cfd);
- }
- dup2(0, 1);
- dup2(0, 2);
-
+ if (execparam) {
+ signal(SIGCHLD, SIG_IGN);
// With more than one -l, repeatedly act as server.
-
- if (do_listen>1 && vfork()) {
+ if (do_listen > 1 && vfork()) {
+ /* parent */
// This is a bit weird as cleanup goes, since we wind up with no
// stdin/stdout/stderr. But it's small and shouldn't hurt anything.
// We check for cfd == 0 above.
+ logmode = LOGMODE_NONE;
close(0);
close(1);
close(2);
-
- goto repeatyness;
+ goto accept_again;
}
- execvp(argv[optind], argv+optind);
+ /* child (or main thread if no multiple -l) */
+ if (cfd) {
+ dup2(cfd, 0);
+ close(cfd);
+ }
+ dup2(0, 1);
+ dup2(0, 2);
+ USE_NC_EXTRA(BB_EXECVP(execparam[0], execparam);)
/* Don't print stuff or it will go over the wire.... */
_exit(127);
}
// Select loop copying stdin to cfd, and cfd to stdout.
-
+
FD_ZERO(&readfds);
FD_SET(cfd, &readfds);
FD_SET(STDIN_FILENO, &readfds);
if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0)
bb_perror_msg_and_die("select");
+#define iobuf bb_common_bufsiz1
for (fd = 0; fd < FD_SETSIZE; fd++) {
if (FD_ISSET(fd, &testfds)) {
- nread = safe_read(fd, bb_common_bufsiz1,
- sizeof(bb_common_bufsiz1));
-
+ nread = safe_read(fd, iobuf, sizeof(iobuf));
if (fd == cfd) {
- if (nread<1) exit(0);
+ if (nread < 1)
+ exit(0);
ofd = STDOUT_FILENO;
} else {
if (nread<1) {
}
ofd = cfd;
}
-
- xwrite(ofd, bb_common_bufsiz1, nread);
+ xwrite(ofd, iobuf, nread);
if (delay > 0) sleep(delay);
}
}
}
}
+#endif
projects / oweals / busybox.git / blobdiff