/* vi: set sw=4 ts=4: */
-/* nc: mini-netcat - built from the ground up for LRP
+/* nc: mini-netcat - built from the ground up for LRP
*
- * Copyright (C) 1998, 1999 Charles P. Wright
- * Copyright (C) 1998 Dave Cinege
+ * 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.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
#include "libbb.h"
-#if ENABLE_DESKTOP
-#include "nc_bloaty.c"
+//config:config NC
+//config: bool "nc"
+//config: default y
+//config: help
+//config: A simple Unix utility which reads and writes data across network
+//config: connections.
+//config:
+//config:config NC_SERVER
+//config: bool "Netcat server options (-l)"
+//config: default y
+//config: depends on NC
+//config: help
+//config: Allow netcat to act as a server.
+//config:
+//config:config NC_EXTRA
+//config: bool "Netcat extensions (-eiw and filename)"
+//config: default y
+//config: depends on NC
+//config: help
+//config: Add -e (support for executing the rest of the command line after
+//config: making or receiving a successful connection), -i (delay interval for
+//config: lines sent), -w (timeout for initial connection).
+//config:
+//config:config NC_110_COMPAT
+//config: bool "Netcat 1.10 compatibility (+2.5k)"
+//config: default n # off specially for Rob
+//config: depends on NC
+//config: help
+//config: This option makes nc closely follow original nc-1.10.
+//config: The code is about 2.5k bigger. It enables
+//config: -s ADDR, -n, -u, -v, -o FILE, -z options, but loses
+//config: busybox-specific extensions: -f FILE and -ll.
+
+#if ENABLE_NC_110_COMPAT
+# include "nc_bloaty.c"
#else
+//usage:#if !ENABLE_NC_110_COMPAT
+//usage:
+//usage:#if ENABLE_NC_SERVER || ENABLE_NC_EXTRA
+//usage:#define NC_OPTIONS_STR "\n"
+//usage:#else
+//usage:#define NC_OPTIONS_STR
+//usage:#endif
+//usage:
+//usage:#define nc_trivial_usage
+//usage: IF_NC_EXTRA("[-iN] [-wN] ")IF_NC_SERVER("[-l] [-p PORT] ")
+//usage: "["IF_NC_EXTRA("-f FILE|")"IPADDR PORT]"IF_NC_EXTRA(" [-e PROG]")
+//usage:#define nc_full_usage "\n\n"
+//usage: "Open a pipe to IP:PORT" IF_NC_EXTRA(" or FILE")
+//usage: NC_OPTIONS_STR
+//usage: IF_NC_EXTRA(
+//usage: "\n -e PROG Run PROG after connect"
+//usage: IF_NC_SERVER(
+//usage: "\n -l Listen mode, for inbound connects"
+//usage: IF_NC_EXTRA(
+//usage: "\n (use -l twice with -e for persistent server)")
+//usage: "\n -p PORT Local port"
+//usage: )
+//usage: "\n -w SEC Timeout for connect"
+//usage: "\n -i SEC Delay interval for lines sent"
+//usage: "\n -f FILE Use file (ala /dev/ttyS0) instead of network"
+//usage: )
+//usage:
+//usage:#define nc_notes_usage ""
+//usage: IF_NC_EXTRA(
+//usage: "To use netcat as a terminal emulator on a serial port:\n\n"
+//usage: "$ stty 115200 -F /dev/ttyS0\n"
+//usage: "$ stty raw -echo -ctlecho && nc -f /dev/ttyS0\n"
+//usage: )
+//usage:
+//usage:#define nc_example_usage
+//usage: "$ nc foobar.somedomain.com 25\n"
+//usage: "220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600\n"
+//usage: "help\n"
+//usage: "214-Commands supported:\n"
+//usage: "214- HELO EHLO MAIL RCPT DATA AUTH\n"
+//usage: "214 NOOP QUIT RSET HELP\n"
+//usage: "quit\n"
+//usage: "221 foobar closing connection\n"
+//usage:
+//usage:#endif
+
/* Lots of small differences in features
* when compared to "standard" nc
*/
if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) {
/* getopt32 is _almost_ usable:
- ** it cannot handle "... -e prog -prog-opt" */
+ ** it cannot handle "... -e PROG -prog-opt" */
while ((opt = getopt(argc, argv,
"" IF_NC_SERVER("lp:") IF_NC_EXTRA("w:i:f:e:") )) > 0
) {
/* 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"). */
+ ** (think "nc -w 60 host port -e PROG"). */
IF_NC_EXTRA(
char **p;
// +2: one for progname (optarg) and one for NULL
)
/* 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
+ ** 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();
if (wsecs) {
alarm(0);
- /* Non-ignored siganls revert to SIG_DFL on exec anyway */
+ /* Non-ignored signals revert to SIG_DFL on exec anyway */
/*signal(SIGALRM, SIG_DFL);*/
}
/* -e given? */
if (execparam) {
- signal(SIGCHLD, SIG_IGN);
- // With more than one -l, repeatedly act as server.
- if (do_listen > 1 && vfork()) {
+ pid_t pid;
+ /* With more than one -l, repeatedly act as server */
+ if (do_listen > 1 && (pid = xvfork()) != 0) {
/* 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);
+ /* prevent zombies */
+ signal(SIGCHLD, SIG_IGN);
+ close(cfd);
goto accept_again;
}
- /* child (or main thread if no multiple -l) */
+ /* child, or main thread if only one -l */
xmove_fd(cfd, 0);
xdup2(0, 1);
xdup2(0, 2);
IF_NC_EXTRA(BB_EXECVP(execparam[0], execparam);)
- /* Don't print stuff or it will go over the wire.... */
+ /* Don't print stuff or it will go over the wire... */
_exit(127);
}
- // Select loop copying stdin to cfd, and cfd to stdout.
+ /* Select loop copying stdin to cfd, and cfd to stdout */
FD_ZERO(&readfds);
FD_SET(cfd, &readfds);
testfds = readfds;
- if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0)
+ if (select(cfd + 1, &testfds, NULL, NULL, NULL) < 0)
bb_perror_msg_and_die("select");
#define iobuf bb_common_bufsiz1
- for (fd = 0; fd < FD_SETSIZE; fd++) {
+ fd = STDIN_FILENO;
+ while (1) {
if (FD_ISSET(fd, &testfds)) {
nread = safe_read(fd, iobuf, sizeof(iobuf));
if (fd == cfd) {
exit(EXIT_SUCCESS);
ofd = STDOUT_FILENO;
} else {
- if (nread<1) {
- // Close outgoing half-connection so they get EOF, but
- // leave incoming alone so we can see response.
+ if (nread < 1) {
+ /* Close outgoing half-connection so they get EOF,
+ * but leave incoming alone so we can see response */
shutdown(cfd, 1);
FD_CLR(STDIN_FILENO, &readfds);
}
ofd = cfd;
}
xwrite(ofd, iobuf, nread);
- if (delay > 0) sleep(delay);
+ if (delay > 0)
+ sleep(delay);
}
+ if (fd == cfd)
+ break;
+ fd = cfd;
}
}
}
projects / oweals / busybox.git / blobdiff