/* 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.
*/
static void timeout(int signum)
{
- bb_error_msg_and_die("Timed out");
+ bb_error_msg_and_die("timed out");
}
int nc_main(int argc, char **argv)
{
- int do_listen = 0, lport = 0, delay = 0, wsecs = 0, execflag = 0, opt,
- sfd = 0, cfd;
+ int sfd = 0;
+ int cfd = 0;
+ SKIP_NC_SERVER(const) unsigned do_listen = 0;
+ SKIP_NC_SERVER(const) unsigned lport = 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;)
struct sockaddr_in address;
- struct hostent *hostinfo;
fd_set readfds, testfds;
- char *infile = NULL;
+ int opt; /* must be signed (getopt returns -1) */
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++;
- 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;
+ 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') 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();
}
- }
-
-
- // 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))
+ 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
+ opt = ((do_listen || cfd) ? 0 : 2);
+ if (argc != opt)
bb_show_usage();
+ } else {
+ if (argc != 3) bb_show_usage();
+ argc--;
+ argv++;
+ }
if (wsecs) {
signal(SIGALRM, timeout);
alarm(wsecs);
}
-
- if (infile) cfd = bb_xopen(infile, O_RDWR);
- else {
- opt = 1;
- sfd = bb_xsocket(AF_INET, SOCK_STREAM, 0);
+
+ if (!cfd) {
+ sfd = xsocket(AF_INET, SOCK_STREAM, 0);
fcntl(sfd, F_SETFD, FD_CLOEXEC);
- setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof (opt));
+ opt = 1;
+ setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
address.sin_family = AF_INET;
// Set local port.
if (lport != 0) {
address.sin_port = lport;
-
- bb_xbind(sfd, (struct sockaddr *) &address, sizeof(address));
+ xbind(sfd, (struct sockaddr *) &address, sizeof(address));
}
if (do_listen) {
socklen_t addrlen = sizeof(address);
- bb_xlisten(sfd, do_listen);
+ xlisten(sfd, do_listen);
// If we didn't specify a port number, query and print it to stderr.
getsockname(sfd, &address, &len);
fdprintf(2, "%d\n", SWAP_BE16(address.sin_port));
}
-repeatyness:
- if ((cfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
+ repeatyness:
+ cfd = accept(sfd, (struct sockaddr *) &address, &addrlen);
+ if (cfd < 0)
bb_perror_msg_and_die("accept");
- if (!execflag) close(sfd);
+ if (!execparam) close(sfd);
} else {
- hostinfo = xgethostbyname(argv[optind]);
+ struct hostent *hostinfo;
+ hostinfo = xgethostbyname(argv[0]);
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
- address.sin_port = bb_lookup_port(argv[optind+1], "tcp", 0);
+ address.sin_port = bb_lookup_port(argv[1], "tcp", 0);
if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
bb_perror_msg_and_die("connect");
}
/* -e given? */
- if (execflag) {
- if(cfd) {
+ if (execparam) {
+ if (cfd) {
signal(SIGCHLD, SIG_IGN);
dup2(cfd, 0);
close(cfd);
// With more than one -l, repeatedly act as server.
- if (do_listen>1 && vfork()) {
+ if (do_listen > 1 && vfork()) {
// 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;
}
- execvp(argv[optind], argv+optind);
+ USE_NC_EXTRA(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);
projects / oweals / busybox.git / blobdiff