/* 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.
*/
+//config:config NC
+//config: bool "nc (11 kb)"
+//config: default y
+//config: help
+//config: A simple Unix utility which reads and writes data across network
+//config: connections.
+//config:
+//config:config NETCAT
+//config: bool "netcat (11 kb)"
+//config: default n
+//config: help
+//config: Alias to nc.
+//config:
+//config:config NC_SERVER
+//config: bool "Netcat server options (-l)"
+//config: default y
+//config: depends on NC || NETCAT
+//config: help
+//config: Allow netcat to act as a server.
+//config:
+//config:config NC_EXTRA
+//config: bool "Netcat extensions (-eiw and -f FILE)"
+//config: default y
+//config: depends on NC || NETCAT
+//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 y
+//config: depends on NC || NETCAT
+//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.
-#include "libbb.h"
+//applet:IF_NC(APPLET(nc, BB_DIR_USR_BIN, BB_SUID_DROP))
+// APPLET_ODDNAME:name main location suid_type help
+//applet:IF_NETCAT(APPLET_ODDNAME(netcat, nc, BB_DIR_USR_BIN, BB_SUID_DROP, nc))
+
+//kbuild:lib-$(CONFIG_NC) += nc.o
+//kbuild:lib-$(CONFIG_NETCAT) += nc.o
-#if ENABLE_DESKTOP
-#include "nc_bloaty.c"
+#include "libbb.h"
+#include "common_bufsiz.h"
+#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_SERVER(
+//usage: "\n -l Listen mode, for inbound connects"
+//usage: IF_NC_EXTRA(
+//usage: "\n (use -ll with -e for persistent server)"
+//usage: )
+//usage: "\n -p PORT Local port"
+//usage: )
+//usage: IF_NC_EXTRA(
+//usage: "\n -w SEC Connect timeout"
+//usage: "\n -i SEC Delay interval for lines sent"
+//usage: "\n -f FILE Use file (ala /dev/ttyS0) instead of network"
+//usage: "\n -e PROG Run PROG after connect"
+//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_NOT_NC_EXTRA (const) unsigned delay = 0;
IF_NOT_NC_EXTRA (const int execparam = 0;)
IF_NC_EXTRA (char **execparam = NULL;)
- fd_set readfds, testfds;
+ struct pollfd pfds[2];
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" */
+ ** it cannot handle "... -e PROG -prog-opt" */
while ((opt = getopt(argc, argv,
- "" IF_NC_SERVER("lp:") IF_NC_EXTRA("w:i:f:e:") )) > 0
+ "" IF_NC_SERVER("lp:") IF_NC_EXTRA("w:i:f:e:") )) > 0
) {
if (ENABLE_NC_SERVER && opt == 'l')
IF_NC_SERVER(do_listen++);
/* 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
*p++ = argv[optind++];
}
)
- /* optind points to argv[arvc] (NULL) now.
+ /* optind points to argv[argc] (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 (execparam) {
pid_t pid;
/* With more than one -l, repeatedly act as server */
- if (do_listen > 1 && (pid = vfork()) != 0) {
- /* parent or error */
- if (pid < 0)
- bb_perror_msg_and_die("vfork");
+ if (do_listen > 1 && (pid = xvfork()) != 0) {
+ /* parent */
/* prevent zombies */
signal(SIGCHLD, SIG_IGN);
close(cfd);
/* child, or main thread if only one -l */
xmove_fd(cfd, 0);
xdup2(0, 1);
- xdup2(0, 2);
+ /*xdup2(0, 2); - original nc 1.10 does this, we don't */
IF_NC_EXTRA(BB_EXECVP(execparam[0], execparam);)
- /* Don't print stuff or it will go over the wire... */
- _exit(127);
+ IF_NC_EXTRA(bb_perror_msg_and_die("can't execute '%s'", execparam[0]);)
}
- /* Select loop copying stdin to cfd, and cfd to stdout */
+ /* loop copying stdin to cfd, and cfd to stdout */
- FD_ZERO(&readfds);
- FD_SET(cfd, &readfds);
- FD_SET(STDIN_FILENO, &readfds);
+ pfds[0].fd = STDIN_FILENO;
+ pfds[0].events = POLLIN;
+ pfds[1].fd = cfd;
+ pfds[1].events = POLLIN;
+#define iobuf bb_common_bufsiz1
+ setup_common_bufsiz();
for (;;) {
- int fd;
+ int fdidx;
int ofd;
int nread;
- testfds = readfds;
-
- if (select(cfd + 1, &testfds, NULL, NULL, NULL) < 0)
- bb_perror_msg_and_die("select");
+ if (safe_poll(pfds, 2, -1) < 0)
+ bb_perror_msg_and_die("poll");
-#define iobuf bb_common_bufsiz1
- fd = STDIN_FILENO;
+ fdidx = 0;
while (1) {
- if (FD_ISSET(fd, &testfds)) {
- nread = safe_read(fd, iobuf, sizeof(iobuf));
- if (fd == cfd) {
+ if (pfds[fdidx].revents) {
+ nread = safe_read(pfds[fdidx].fd, iobuf, COMMON_BUFSIZE);
+ if (fdidx != 0) {
if (nread < 1)
exit(EXIT_SUCCESS);
ofd = STDOUT_FILENO;
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);
+ shutdown(cfd, SHUT_WR);
+ pfds[0].fd = -1;
}
ofd = cfd;
}
if (delay > 0)
sleep(delay);
}
- if (fd == cfd)
+ if (fdidx == 1)
break;
- fd = cfd;
+ fdidx++;
}
}
}
projects / oweals / busybox.git / blobdiff