Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 2 | /* nc: mini-netcat - built from the ground up for LRP |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 3 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 4 | * Copyright (C) 1998, 1999 Charles P. Wright |
| 5 | * Copyright (C) 1998 Dave Cinege |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 6 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 8 | */ |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 9 | //config:config NC |
Denys Vlasenko | 4eed2c6 | 2017-07-18 22:01:24 +0200 | [diff] [blame^] | 10 | //config: bool "nc (11 kb)" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: A simple Unix utility which reads and writes data across network |
| 14 | //config: connections. |
| 15 | //config: |
| 16 | //config:config NC_SERVER |
| 17 | //config: bool "Netcat server options (-l)" |
| 18 | //config: default y |
| 19 | //config: depends on NC |
| 20 | //config: help |
| 21 | //config: Allow netcat to act as a server. |
| 22 | //config: |
| 23 | //config:config NC_EXTRA |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 24 | //config: bool "Netcat extensions (-eiw and -f FILE)" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 25 | //config: default y |
| 26 | //config: depends on NC |
| 27 | //config: help |
| 28 | //config: Add -e (support for executing the rest of the command line after |
| 29 | //config: making or receiving a successful connection), -i (delay interval for |
| 30 | //config: lines sent), -w (timeout for initial connection). |
| 31 | //config: |
| 32 | //config:config NC_110_COMPAT |
| 33 | //config: bool "Netcat 1.10 compatibility (+2.5k)" |
Denys Vlasenko | fb4cb1c | 2010-07-18 23:02:36 +0200 | [diff] [blame] | 34 | //config: default n # off specially for Rob |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 35 | //config: depends on NC |
| 36 | //config: help |
| 37 | //config: This option makes nc closely follow original nc-1.10. |
| 38 | //config: The code is about 2.5k bigger. It enables |
| 39 | //config: -s ADDR, -n, -u, -v, -o FILE, -z options, but loses |
Denys Vlasenko | ed954b6 | 2013-02-28 12:39:27 +0100 | [diff] [blame] | 40 | //config: busybox-specific extensions: -f FILE. |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 41 | |
Denys Vlasenko | 47367e1 | 2016-11-23 09:05:14 +0100 | [diff] [blame] | 42 | //applet:IF_NC(APPLET(nc, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 43 | |
| 44 | //kbuild:lib-$(CONFIG_NC) += nc.o |
| 45 | |
| 46 | #include "libbb.h" |
| 47 | #include "common_bufsiz.h" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 48 | #if ENABLE_NC_110_COMPAT |
| 49 | # include "nc_bloaty.c" |
Denis Vlasenko | 29fe726 | 2007-04-05 20:26:28 +0000 | [diff] [blame] | 50 | #else |
| 51 | |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 52 | //usage:#if !ENABLE_NC_110_COMPAT |
| 53 | //usage: |
| 54 | //usage:#if ENABLE_NC_SERVER || ENABLE_NC_EXTRA |
Denys Vlasenko | 6642676 | 2011-06-05 03:58:28 +0200 | [diff] [blame] | 55 | //usage:#define NC_OPTIONS_STR "\n" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 56 | //usage:#else |
| 57 | //usage:#define NC_OPTIONS_STR |
| 58 | //usage:#endif |
| 59 | //usage: |
| 60 | //usage:#define nc_trivial_usage |
| 61 | //usage: IF_NC_EXTRA("[-iN] [-wN] ")IF_NC_SERVER("[-l] [-p PORT] ") |
| 62 | //usage: "["IF_NC_EXTRA("-f FILE|")"IPADDR PORT]"IF_NC_EXTRA(" [-e PROG]") |
| 63 | //usage:#define nc_full_usage "\n\n" |
| 64 | //usage: "Open a pipe to IP:PORT" IF_NC_EXTRA(" or FILE") |
| 65 | //usage: NC_OPTIONS_STR |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 66 | //usage: IF_NC_SERVER( |
| 67 | //usage: "\n -l Listen mode, for inbound connects" |
| 68 | //usage: IF_NC_EXTRA( |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 69 | //usage: "\n (use -ll with -e for persistent server)" |
| 70 | //usage: ) |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 71 | //usage: "\n -p PORT Local port" |
| 72 | //usage: ) |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 73 | //usage: IF_NC_EXTRA( |
| 74 | //usage: "\n -w SEC Connect timeout" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 75 | //usage: "\n -i SEC Delay interval for lines sent" |
| 76 | //usage: "\n -f FILE Use file (ala /dev/ttyS0) instead of network" |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 77 | //usage: "\n -e PROG Run PROG after connect" |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 78 | //usage: ) |
| 79 | //usage: |
| 80 | //usage:#define nc_notes_usage "" |
| 81 | //usage: IF_NC_EXTRA( |
| 82 | //usage: "To use netcat as a terminal emulator on a serial port:\n\n" |
| 83 | //usage: "$ stty 115200 -F /dev/ttyS0\n" |
| 84 | //usage: "$ stty raw -echo -ctlecho && nc -f /dev/ttyS0\n" |
| 85 | //usage: ) |
| 86 | //usage: |
| 87 | //usage:#define nc_example_usage |
| 88 | //usage: "$ nc foobar.somedomain.com 25\n" |
| 89 | //usage: "220 foobar ESMTP Exim 3.12 #1 Sat, 15 Apr 2000 00:03:02 -0600\n" |
| 90 | //usage: "help\n" |
| 91 | //usage: "214-Commands supported:\n" |
| 92 | //usage: "214- HELO EHLO MAIL RCPT DATA AUTH\n" |
| 93 | //usage: "214 NOOP QUIT RSET HELP\n" |
| 94 | //usage: "quit\n" |
| 95 | //usage: "221 foobar closing connection\n" |
| 96 | //usage: |
| 97 | //usage:#endif |
| 98 | |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 99 | /* Lots of small differences in features |
| 100 | * when compared to "standard" nc |
| 101 | */ |
| 102 | |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 103 | static void timeout(int signum UNUSED_PARAM) |
Mike Frysinger | 60a5c38 | 2005-05-06 04:45:38 +0000 | [diff] [blame] | 104 | { |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 105 | bb_error_msg_and_die("timed out"); |
Mike Frysinger | 60a5c38 | 2005-05-06 04:45:38 +0000 | [diff] [blame] | 106 | } |
| 107 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 108 | int nc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Erik Andersen | 7ab9c7e | 2000-05-12 19:41:47 +0000 | [diff] [blame] | 109 | int nc_main(int argc, char **argv) |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 110 | { |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 111 | /* sfd sits _here_ only because of "repeat" option (-l -l). */ |
| 112 | int sfd = sfd; /* for gcc */ |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 113 | int cfd = 0; |
Denis Vlasenko | 3163555 | 2007-01-20 16:54:19 +0000 | [diff] [blame] | 114 | unsigned lport = 0; |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 115 | IF_NOT_NC_SERVER(const) unsigned do_listen = 0; |
| 116 | IF_NOT_NC_EXTRA (const) unsigned wsecs = 0; |
| 117 | IF_NOT_NC_EXTRA (const) unsigned delay = 0; |
| 118 | IF_NOT_NC_EXTRA (const int execparam = 0;) |
| 119 | IF_NC_EXTRA (char **execparam = NULL;) |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 120 | struct pollfd pfds[2]; |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 121 | int opt; /* must be signed (getopt returns -1) */ |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 122 | |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 123 | if (ENABLE_NC_SERVER || ENABLE_NC_EXTRA) { |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 124 | /* getopt32 is _almost_ usable: |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 125 | ** it cannot handle "... -e PROG -prog-opt" */ |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 126 | while ((opt = getopt(argc, argv, |
Denys Vlasenko | 6967578 | 2013-01-14 01:34:48 +0100 | [diff] [blame] | 127 | "" IF_NC_SERVER("lp:") IF_NC_EXTRA("w:i:f:e:") )) > 0 |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 128 | ) { |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 129 | if (ENABLE_NC_SERVER && opt == 'l') |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 130 | IF_NC_SERVER(do_listen++); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 131 | else if (ENABLE_NC_SERVER && opt == 'p') |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 132 | IF_NC_SERVER(lport = bb_lookup_port(optarg, "tcp", 0)); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 133 | else if (ENABLE_NC_EXTRA && opt == 'w') |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 134 | IF_NC_EXTRA( wsecs = xatou(optarg)); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 135 | else if (ENABLE_NC_EXTRA && opt == 'i') |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 136 | IF_NC_EXTRA( delay = xatou(optarg)); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 137 | else if (ENABLE_NC_EXTRA && opt == 'f') |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 138 | IF_NC_EXTRA( cfd = xopen(optarg, O_RDWR)); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 139 | else if (ENABLE_NC_EXTRA && opt == 'e' && optind <= argc) { |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 140 | /* We cannot just 'break'. We should let getopt finish. |
| 141 | ** Or else we won't be able to find where |
| 142 | ** 'host' and 'port' params are |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 143 | ** (think "nc -w 60 host port -e PROG"). */ |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 144 | IF_NC_EXTRA( |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 145 | char **p; |
| 146 | // +2: one for progname (optarg) and one for NULL |
| 147 | execparam = xzalloc(sizeof(char*) * (argc - optind + 2)); |
| 148 | p = execparam; |
| 149 | *p++ = optarg; |
| 150 | while (optind < argc) { |
| 151 | *p++ = argv[optind++]; |
| 152 | } |
| 153 | ) |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 154 | /* optind points to argv[argc] (NULL) now. |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 155 | ** FIXME: we assume that getopt will not count options |
Denys Vlasenko | 77cc2c5 | 2010-06-27 04:22:02 +0200 | [diff] [blame] | 156 | ** possibly present on "-e PROG ARGS" and will not |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 157 | ** include them into final value of optind |
| 158 | ** which is to be used ... */ |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 159 | } else bb_show_usage(); |
Matt Kraai | 1d70267 | 2001-02-07 04:09:23 +0000 | [diff] [blame] | 160 | } |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 161 | argv += optind; /* ... here! */ |
| 162 | argc -= optind; |
| 163 | // -l and -f don't mix |
| 164 | if (do_listen && cfd) bb_show_usage(); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 165 | // File mode needs need zero arguments, listen mode needs zero or one, |
| 166 | // client mode needs one or two |
| 167 | if (cfd) { |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 168 | if (argc) bb_show_usage(); |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 169 | } else if (do_listen) { |
| 170 | if (argc > 1) bb_show_usage(); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 171 | } else { |
| 172 | if (!argc || argc > 2) bb_show_usage(); |
| 173 | } |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 174 | } else { |
| 175 | if (argc != 3) bb_show_usage(); |
| 176 | argc--; |
| 177 | argv++; |
| 178 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 179 | |
Mike Frysinger | 60a5c38 | 2005-05-06 04:45:38 +0000 | [diff] [blame] | 180 | if (wsecs) { |
| 181 | signal(SIGALRM, timeout); |
| 182 | alarm(wsecs); |
| 183 | } |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 184 | |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 185 | if (!cfd) { |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 186 | if (do_listen) { |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 187 | sfd = create_and_bind_stream_or_die(argv[0], lport); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 188 | xlisten(sfd, do_listen); /* can be > 1 */ |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 189 | #if 0 /* nc-1.10 does not do this (without -v) */ |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 190 | /* If we didn't specify a port number, |
| 191 | * query and print it after listen() */ |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 192 | if (!lport) { |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 193 | len_and_sockaddr lsa; |
| 194 | lsa.len = LSA_SIZEOF_SA; |
| 195 | getsockname(sfd, &lsa.u.sa, &lsa.len); |
| 196 | lport = get_nport(&lsa.u.sa); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 197 | fdprintf(2, "%d\n", ntohs(lport)); |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 198 | } |
Denis Vlasenko | f6b4685 | 2009-04-25 13:16:53 +0000 | [diff] [blame] | 199 | #endif |
Denis Vlasenko | 96e1b38 | 2007-09-30 23:50:48 +0000 | [diff] [blame] | 200 | close_on_exec_on(sfd); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 201 | accept_again: |
Denis Vlasenko | 703e202 | 2007-01-22 14:12:08 +0000 | [diff] [blame] | 202 | cfd = accept(sfd, NULL, 0); |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 203 | if (cfd < 0) |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 204 | bb_perror_msg_and_die("accept"); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 205 | if (!execparam) |
| 206 | close(sfd); |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 207 | } else { |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 208 | cfd = create_and_connect_stream_or_die(argv[0], |
| 209 | argv[1] ? bb_lookup_port(argv[1], "tcp", 0) : 0); |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 210 | } |
Matt Kraai | 1d70267 | 2001-02-07 04:09:23 +0000 | [diff] [blame] | 211 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 212 | |
Mike Frysinger | 60a5c38 | 2005-05-06 04:45:38 +0000 | [diff] [blame] | 213 | if (wsecs) { |
| 214 | alarm(0); |
Denys Vlasenko | 28a105d | 2009-06-01 11:26:30 +0200 | [diff] [blame] | 215 | /* Non-ignored signals revert to SIG_DFL on exec anyway */ |
Denis Vlasenko | 3fa36e2 | 2008-11-09 00:15:11 +0000 | [diff] [blame] | 216 | /*signal(SIGALRM, SIG_DFL);*/ |
Mike Frysinger | 60a5c38 | 2005-05-06 04:45:38 +0000 | [diff] [blame] | 217 | } |
| 218 | |
Eric Andersen | 1323c94 | 2002-04-26 23:59:12 +0000 | [diff] [blame] | 219 | /* -e given? */ |
Denis Vlasenko | d0e70af | 2006-10-16 01:10:28 +0000 | [diff] [blame] | 220 | if (execparam) { |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 221 | pid_t pid; |
| 222 | /* With more than one -l, repeatedly act as server */ |
Pascal Bellard | 926031b | 2010-07-04 15:32:38 +0200 | [diff] [blame] | 223 | if (do_listen > 1 && (pid = xvfork()) != 0) { |
| 224 | /* parent */ |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 225 | /* prevent zombies */ |
| 226 | signal(SIGCHLD, SIG_IGN); |
| 227 | close(cfd); |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 228 | goto accept_again; |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 229 | } |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 230 | /* child, or main thread if only one -l */ |
Denis Vlasenko | fa0b56d | 2008-07-01 16:09:07 +0000 | [diff] [blame] | 231 | xmove_fd(cfd, 0); |
| 232 | xdup2(0, 1); |
Denys Vlasenko | a14f319 | 2013-02-28 11:09:14 +0100 | [diff] [blame] | 233 | /*xdup2(0, 2); - original nc 1.10 does this, we don't */ |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 234 | IF_NC_EXTRA(BB_EXECVP(execparam[0], execparam);) |
Denys Vlasenko | c56d125 | 2013-03-17 22:59:51 +0100 | [diff] [blame] | 235 | IF_NC_EXTRA(bb_perror_msg_and_die("can't execute '%s'", execparam[0]);) |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 238 | /* loop copying stdin to cfd, and cfd to stdout */ |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 239 | |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 240 | pfds[0].fd = STDIN_FILENO; |
| 241 | pfds[0].events = POLLIN; |
| 242 | pfds[1].fd = cfd; |
| 243 | pfds[1].events = POLLIN; |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 244 | |
Denys Vlasenko | 9de2e5a | 2016-04-21 18:38:51 +0200 | [diff] [blame] | 245 | #define iobuf bb_common_bufsiz1 |
| 246 | setup_common_bufsiz(); |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 247 | for (;;) { |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 248 | int fdidx; |
Eric Andersen | 2ce1edc | 1999-10-12 15:42:48 +0000 | [diff] [blame] | 249 | int ofd; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 250 | int nread; |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 251 | |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 252 | if (safe_poll(pfds, 2, -1) < 0) |
| 253 | bb_perror_msg_and_die("poll"); |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 254 | |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 255 | fdidx = 0; |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 256 | while (1) { |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 257 | if (pfds[fdidx].revents) { |
| 258 | nread = safe_read(pfds[fdidx].fd, iobuf, COMMON_BUFSIZE); |
| 259 | if (fdidx != 0) { |
Denis Vlasenko | 5d68724 | 2007-01-12 20:59:31 +0000 | [diff] [blame] | 260 | if (nread < 1) |
Bernhard Reutner-Fischer | 636a1f8 | 2008-05-19 09:29:47 +0000 | [diff] [blame] | 261 | exit(EXIT_SUCCESS); |
Matt Kraai | bfa7967 | 2000-12-15 22:34:34 +0000 | [diff] [blame] | 262 | ofd = STDOUT_FILENO; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 263 | } else { |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 264 | if (nread < 1) { |
| 265 | /* Close outgoing half-connection so they get EOF, |
| 266 | * but leave incoming alone so we can see response */ |
Denys Vlasenko | ca54b66 | 2013-07-28 21:08:37 +0200 | [diff] [blame] | 267 | shutdown(cfd, SHUT_WR); |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 268 | pfds[0].fd = -1; |
Paul Fox | 7b71d74 | 2005-07-18 22:23:16 +0000 | [diff] [blame] | 269 | } |
Rob Landley | 1cca948 | 2006-07-10 19:45:20 +0000 | [diff] [blame] | 270 | ofd = cfd; |
Eric Andersen | 2ce1edc | 1999-10-12 15:42:48 +0000 | [diff] [blame] | 271 | } |
Denis Vlasenko | 74324c8 | 2007-06-04 10:16:52 +0000 | [diff] [blame] | 272 | xwrite(ofd, iobuf, nread); |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 273 | if (delay > 0) |
| 274 | sleep(delay); |
Eric Andersen | 2ce1edc | 1999-10-12 15:42:48 +0000 | [diff] [blame] | 275 | } |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 276 | if (fdidx == 1) |
Tomoya Adachi | 63416cc | 2009-08-03 02:59:22 +0200 | [diff] [blame] | 277 | break; |
Denys Vlasenko | 5b3b468 | 2017-02-16 17:17:17 +0100 | [diff] [blame] | 278 | fdidx++; |
Erik Andersen | e49d5ec | 2000-02-08 19:58:47 +0000 | [diff] [blame] | 279 | } |
| 280 | } |
Eric Andersen | cc8ed39 | 1999-10-05 16:24:54 +0000 | [diff] [blame] | 281 | } |
Denis Vlasenko | 29fe726 | 2007-04-05 20:26:28 +0000 | [diff] [blame] | 282 | #endif |