Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 2 | /* |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 3 | * telnet implementation for busybox |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 4 | * |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 5 | * Author: Tomi Ollila <too@iki.fi> |
| 6 | * Copyright (C) 1994-2000 by Tomi Ollila |
| 7 | * |
| 8 | * Created: Thu Apr 7 13:29:41 1994 too |
| 9 | * Last modified: Fri Jun 9 14:34:24 2000 too |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 10 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 12 | * |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 13 | * HISTORY |
| 14 | * Revision 3.1 1994/04/17 11:31:54 too |
| 15 | * initial revision |
Eric Andersen | cb81e64 | 2003-07-14 21:21:08 +0000 | [diff] [blame] | 16 | * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org> |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 17 | * Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan |
| 18 | * <jam@ltsp.org> |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 19 | * Modified 2004/02/11 to add ability to pass the USER variable to remote host |
| 20 | * by Fernando Silveira <swrh@gmx.net> |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 21 | * |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 22 | */ |
| 23 | |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 24 | //usage:#if ENABLE_FEATURE_TELNET_AUTOLOGIN |
| 25 | //usage:#define telnet_trivial_usage |
| 26 | //usage: "[-a] [-l USER] HOST [PORT]" |
| 27 | //usage:#define telnet_full_usage "\n\n" |
| 28 | //usage: "Connect to telnet server\n" |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 29 | //usage: "\n -a Automatic login with $USER variable" |
| 30 | //usage: "\n -l USER Automatic login as USER" |
| 31 | //usage: |
| 32 | //usage:#else |
| 33 | //usage:#define telnet_trivial_usage |
| 34 | //usage: "HOST [PORT]" |
| 35 | //usage:#define telnet_full_usage "\n\n" |
| 36 | //usage: "Connect to telnet server" |
| 37 | //usage:#endif |
| 38 | |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 39 | #include <arpa/telnet.h> |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 40 | #include <netinet/in.h> |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 41 | #include "libbb.h" |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 42 | |
Denys Vlasenko | 14bd16a | 2011-07-08 08:49:40 +0200 | [diff] [blame] | 43 | #ifdef __BIONIC__ |
| 44 | /* should be in arpa/telnet.h */ |
| 45 | # define IAC 255 /* interpret as command: */ |
| 46 | # define DONT 254 /* you are not to use option */ |
| 47 | # define DO 253 /* please, you use option */ |
| 48 | # define WONT 252 /* I won't use option */ |
| 49 | # define WILL 251 /* I will use option */ |
| 50 | # define SB 250 /* interpret as subnegotiation */ |
| 51 | # define SE 240 /* end sub negotiation */ |
| 52 | # define TELOPT_ECHO 1 /* echo */ |
| 53 | # define TELOPT_SGA 3 /* suppress go ahead */ |
| 54 | # define TELOPT_TTYPE 24 /* terminal type */ |
| 55 | # define TELOPT_NAWS 31 /* window size */ |
| 56 | #endif |
| 57 | |
Pavel Roskin | 616d13b | 2000-07-28 19:38:27 +0000 | [diff] [blame] | 58 | #ifdef DOTRACE |
Denys Vlasenko | 14bd16a | 2011-07-08 08:49:40 +0200 | [diff] [blame] | 59 | # define TRACE(x, y) do { if (x) printf y; } while (0) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 60 | #else |
Denys Vlasenko | 14bd16a | 2011-07-08 08:49:40 +0200 | [diff] [blame] | 61 | # define TRACE(x, y) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 62 | #endif |
| 63 | |
Mark Whitley | 59ab025 | 2001-01-23 22:30:04 +0000 | [diff] [blame] | 64 | enum { |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 65 | DATABUFSIZE = 128, |
| 66 | IACBUFSIZE = 128, |
| 67 | |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 68 | CHM_TRY = 0, |
| 69 | CHM_ON = 1, |
| 70 | CHM_OFF = 2, |
| 71 | |
| 72 | UF_ECHO = 0x01, |
| 73 | UF_SGA = 0x02, |
| 74 | |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 75 | TS_NORMAL = 0, |
| 76 | TS_COPY = 1, |
Mark Whitley | 59ab025 | 2001-01-23 22:30:04 +0000 | [diff] [blame] | 77 | TS_IAC = 2, |
| 78 | TS_OPT = 3, |
| 79 | TS_SUB1 = 4, |
| 80 | TS_SUB2 = 5, |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 81 | TS_CR = 6, |
Mark Whitley | 59ab025 | 2001-01-23 22:30:04 +0000 | [diff] [blame] | 82 | }; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 83 | |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 84 | typedef unsigned char byte; |
| 85 | |
Denis Vlasenko | 1101d1c | 2008-07-21 09:22:28 +0000 | [diff] [blame] | 86 | enum { netfd = 3 }; |
| 87 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 88 | struct globals { |
Denis Vlasenko | 1101d1c | 2008-07-21 09:22:28 +0000 | [diff] [blame] | 89 | int iaclen; /* could even use byte, but it's a loss on x86 */ |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 90 | byte telstate; /* telnet negotiation state from network input */ |
| 91 | byte telwish; /* DO, DONT, WILL, WONT */ |
| 92 | byte charmode; |
| 93 | byte telflags; |
Paul Fox | f2ddc05 | 2005-07-20 19:55:19 +0000 | [diff] [blame] | 94 | byte do_termios; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 95 | #if ENABLE_FEATURE_TELNET_TTYPE |
| 96 | char *ttype; |
| 97 | #endif |
| 98 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
| 99 | const char *autologin; |
| 100 | #endif |
| 101 | #if ENABLE_FEATURE_AUTOWIDTH |
Denis Vlasenko | 5599502 | 2008-05-18 22:28:26 +0000 | [diff] [blame] | 102 | unsigned win_width, win_height; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 103 | #endif |
| 104 | /* same buffer used both for network and console read/write */ |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 105 | char buf[DATABUFSIZE]; |
| 106 | /* buffer to handle telnet negotiations */ |
Glenn L McGrath | 78b0e37 | 2001-06-26 02:06:08 +0000 | [diff] [blame] | 107 | char iacbuf[IACBUFSIZE]; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 108 | struct termios termios_def; |
| 109 | struct termios termios_raw; |
Denys Vlasenko | 98a4c7c | 2010-02-04 15:00:15 +0100 | [diff] [blame] | 110 | } FIX_ALIASING; |
Denis Vlasenko | 4e5f82c | 2007-06-03 22:30:22 +0000 | [diff] [blame] | 111 | #define G (*(struct globals*)&bb_common_bufsiz1) |
Denis Vlasenko | 74324c8 | 2007-06-04 10:16:52 +0000 | [diff] [blame] | 112 | #define INIT_G() do { \ |
Denys Vlasenko | 7b85ec3 | 2015-10-13 17:17:34 +0200 | [diff] [blame^] | 113 | BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \ |
Denis Vlasenko | 74324c8 | 2007-06-04 10:16:52 +0000 | [diff] [blame] | 114 | } while (0) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 115 | |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 116 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 117 | static void rawmode(void); |
| 118 | static void cookmode(void); |
| 119 | static void do_linemode(void); |
| 120 | static void will_charmode(void); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 121 | static void telopt(byte c); |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 122 | static void subneg(byte c); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 123 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 124 | static void iac_flush(void) |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 125 | { |
Denys Vlasenko | f76fd17 | 2013-05-12 02:13:24 +0200 | [diff] [blame] | 126 | full_write(netfd, G.iacbuf, G.iaclen); |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 127 | G.iaclen = 0; |
| 128 | } |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 129 | |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 130 | static void doexit(int ev) NORETURN; |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 131 | static void doexit(int ev) |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 132 | { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 133 | cookmode(); |
| 134 | exit(ev); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 135 | } |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 136 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 137 | static void con_escape(void) |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 138 | { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 139 | char b; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 140 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 141 | if (bb_got_signal) /* came from line mode... go raw */ |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 142 | rawmode(); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 143 | |
Denys Vlasenko | f76fd17 | 2013-05-12 02:13:24 +0200 | [diff] [blame] | 144 | full_write1_str("\r\nConsole escape. Commands are:\r\n\n" |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 145 | " l go to line mode\r\n" |
| 146 | " c go to character mode\r\n" |
| 147 | " z suspend telnet\r\n" |
| 148 | " e exit telnet\r\n"); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 149 | |
Bernhard Reutner-Fischer | 5e25ddb | 2008-05-19 09:48:17 +0000 | [diff] [blame] | 150 | if (read(STDIN_FILENO, &b, 1) <= 0) |
Bernhard Reutner-Fischer | 636a1f8 | 2008-05-19 09:29:47 +0000 | [diff] [blame] | 151 | doexit(EXIT_FAILURE); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 152 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 153 | switch (b) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 154 | case 'l': |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 155 | if (!bb_got_signal) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 156 | do_linemode(); |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 157 | goto ret; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 158 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 159 | break; |
| 160 | case 'c': |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 161 | if (bb_got_signal) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 162 | will_charmode(); |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 163 | goto ret; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 164 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 165 | break; |
| 166 | case 'z': |
| 167 | cookmode(); |
| 168 | kill(0, SIGTSTP); |
| 169 | rawmode(); |
| 170 | break; |
| 171 | case 'e': |
Bernhard Reutner-Fischer | 636a1f8 | 2008-05-19 09:29:47 +0000 | [diff] [blame] | 172 | doexit(EXIT_SUCCESS); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 173 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 174 | |
Denys Vlasenko | f76fd17 | 2013-05-12 02:13:24 +0200 | [diff] [blame] | 175 | full_write1_str("continuing...\r\n"); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 176 | |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 177 | if (bb_got_signal) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 178 | cookmode(); |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 179 | ret: |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 180 | bb_got_signal = 0; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 181 | } |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 182 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 183 | static void handle_net_output(int len) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 184 | { |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 185 | byte outbuf[2 * DATABUFSIZE]; |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 186 | byte *dst = outbuf; |
| 187 | byte *src = (byte*)G.buf; |
| 188 | byte *end = src + len; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 189 | |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 190 | while (src < end) { |
| 191 | byte c = *src++; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 192 | if (c == 0x1d) { |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 193 | con_escape(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 194 | return; |
| 195 | } |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 196 | *dst = c; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 197 | if (c == IAC) |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 198 | *++dst = c; /* IAC -> IAC IAC */ |
| 199 | else |
| 200 | if (c == '\r' || c == '\n') { |
| 201 | /* Enter key sends '\r' in raw mode and '\n' in cooked one. |
| 202 | * |
| 203 | * See RFC 1123 3.3.1 Telnet End-of-Line Convention. |
Denys Vlasenko | aca464d | 2012-09-13 13:00:49 +0200 | [diff] [blame] | 204 | * Using CR LF instead of other allowed possibilities |
| 205 | * like CR NUL - easier to talk to HTTP/SMTP servers. |
| 206 | */ |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 207 | *dst = '\r'; /* Enter -> CR LF */ |
| 208 | *++dst = '\n'; |
| 209 | } |
| 210 | dst++; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 211 | } |
Denys Vlasenko | 0ffd63c | 2012-09-17 11:54:35 +0200 | [diff] [blame] | 212 | if (dst - outbuf != 0) |
| 213 | full_write(netfd, outbuf, dst - outbuf); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 214 | } |
| 215 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 216 | static void handle_net_input(int len) |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 217 | { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 218 | int i; |
| 219 | int cstart = 0; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 220 | |
Denis Vlasenko | 1bec1b9 | 2007-11-06 02:23:39 +0000 | [diff] [blame] | 221 | for (i = 0; i < len; i++) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 222 | byte c = G.buf[i]; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 223 | |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 224 | if (G.telstate == TS_NORMAL) { /* most typical state */ |
Denis Vlasenko | 1bec1b9 | 2007-11-06 02:23:39 +0000 | [diff] [blame] | 225 | if (c == IAC) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 226 | cstart = i; |
| 227 | G.telstate = TS_IAC; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 228 | } |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 229 | else if (c == '\r') { |
| 230 | cstart = i + 1; |
| 231 | G.telstate = TS_CR; |
| 232 | } |
| 233 | /* No IACs were seen so far, no need to copy |
| 234 | * bytes within G.buf: */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 235 | continue; |
| 236 | } |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 237 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 238 | switch (G.telstate) { |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 239 | case TS_CR: |
| 240 | /* Prev char was CR. If cur one is NUL, ignore it. |
| 241 | * See RFC 1123 section 3.3.1 for discussion of telnet EOL handling. |
| 242 | */ |
| 243 | G.telstate = TS_COPY; |
| 244 | if (c == '\0') |
| 245 | break; |
| 246 | /* else: fall through - need to handle CR IAC ... properly */ |
| 247 | |
| 248 | case TS_COPY: /* Prev char was ordinary */ |
| 249 | /* Similar to NORMAL, but in TS_COPY we need to copy bytes */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 250 | if (c == IAC) |
| 251 | G.telstate = TS_IAC; |
| 252 | else |
| 253 | G.buf[cstart++] = c; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 254 | if (c == '\r') |
| 255 | G.telstate = TS_CR; |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 256 | break; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 257 | |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 258 | case TS_IAC: /* Prev char was IAC */ |
| 259 | if (c == IAC) { /* IAC IAC -> one IAC */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 260 | G.buf[cstart++] = c; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 261 | G.telstate = TS_COPY; |
Denis Vlasenko | 1bec1b9 | 2007-11-06 02:23:39 +0000 | [diff] [blame] | 262 | break; |
Denis Vlasenko | 1bec1b9 | 2007-11-06 02:23:39 +0000 | [diff] [blame] | 263 | } |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 264 | /* else */ |
| 265 | switch (c) { |
| 266 | case SB: |
| 267 | G.telstate = TS_SUB1; |
| 268 | break; |
| 269 | case DO: |
| 270 | case DONT: |
| 271 | case WILL: |
| 272 | case WONT: |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 273 | G.telwish = c; |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 274 | G.telstate = TS_OPT; |
| 275 | break; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 276 | /* DATA MARK must be added later */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 277 | default: |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 278 | G.telstate = TS_COPY; |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 279 | } |
| 280 | break; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 281 | |
| 282 | case TS_OPT: /* Prev chars were IAC WILL/WONT/DO/DONT */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 283 | telopt(c); |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 284 | G.telstate = TS_COPY; |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 285 | break; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 286 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 287 | case TS_SUB1: /* Subnegotiation */ |
| 288 | case TS_SUB2: /* Subnegotiation */ |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 289 | subneg(c); /* can change G.telstate */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 290 | break; |
| 291 | } |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 292 | } |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 293 | |
| 294 | if (G.telstate != TS_NORMAL) { |
| 295 | /* We had some IACs, or CR */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 296 | if (G.iaclen) |
| 297 | iac_flush(); |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 298 | if (G.telstate == TS_COPY) /* we aren't in the middle of IAC */ |
| 299 | G.telstate = TS_NORMAL; |
Glenn L McGrath | 78b0e37 | 2001-06-26 02:06:08 +0000 | [diff] [blame] | 300 | len = cstart; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 301 | } |
| 302 | |
Glenn L McGrath | 78b0e37 | 2001-06-26 02:06:08 +0000 | [diff] [blame] | 303 | if (len) |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 304 | full_write(STDOUT_FILENO, G.buf, len); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 305 | } |
| 306 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 307 | static void put_iac(int c) |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 308 | { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 309 | G.iacbuf[G.iaclen++] = c; |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 310 | } |
| 311 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 312 | static void put_iac2(byte wwdd, byte c) |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 313 | { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 314 | if (G.iaclen + 3 > IACBUFSIZE) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 315 | iac_flush(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 316 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 317 | put_iac(IAC); |
| 318 | put_iac(wwdd); |
| 319 | put_iac(c); |
Erik Andersen | f7c49ef | 2000-02-22 17:17:45 +0000 | [diff] [blame] | 320 | } |
| 321 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 322 | #if ENABLE_FEATURE_TELNET_TTYPE |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 323 | static void put_iac_subopt(byte c, char *str) |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 324 | { |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 325 | int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 ) |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 326 | |
| 327 | if (G.iaclen + len > IACBUFSIZE) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 328 | iac_flush(); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 329 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 330 | put_iac(IAC); |
| 331 | put_iac(SB); |
| 332 | put_iac(c); |
| 333 | put_iac(0); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 334 | |
Denis Vlasenko | bf0a201 | 2006-12-26 10:42:51 +0000 | [diff] [blame] | 335 | while (*str) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 336 | put_iac(*str++); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 337 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 338 | put_iac(IAC); |
| 339 | put_iac(SE); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 340 | } |
| 341 | #endif |
| 342 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 343 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 344 | static void put_iac_subopt_autologin(void) |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 345 | { |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 346 | int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2) |
Denys Vlasenko | 25b10d9 | 2010-04-27 08:54:24 +0200 | [diff] [blame] | 347 | const char *p = "USER"; |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 348 | |
| 349 | if (G.iaclen + len > IACBUFSIZE) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 350 | iac_flush(); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 351 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 352 | put_iac(IAC); |
| 353 | put_iac(SB); |
| 354 | put_iac(TELOPT_NEW_ENVIRON); |
| 355 | put_iac(TELQUAL_IS); |
| 356 | put_iac(NEW_ENV_VAR); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 357 | |
Denys Vlasenko | 25b10d9 | 2010-04-27 08:54:24 +0200 | [diff] [blame] | 358 | while (*p) |
| 359 | put_iac(*p++); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 360 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 361 | put_iac(NEW_ENV_VALUE); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 362 | |
Denys Vlasenko | 25b10d9 | 2010-04-27 08:54:24 +0200 | [diff] [blame] | 363 | p = G.autologin; |
| 364 | while (*p) |
| 365 | put_iac(*p++); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 366 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 367 | put_iac(IAC); |
| 368 | put_iac(SE); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 369 | } |
| 370 | #endif |
| 371 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 372 | #if ENABLE_FEATURE_AUTOWIDTH |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 373 | static void put_iac_naws(byte c, int x, int y) |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 374 | { |
| 375 | if (G.iaclen + 9 > IACBUFSIZE) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 376 | iac_flush(); |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 377 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 378 | put_iac(IAC); |
| 379 | put_iac(SB); |
| 380 | put_iac(c); |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 381 | |
Denys Vlasenko | f76fd17 | 2013-05-12 02:13:24 +0200 | [diff] [blame] | 382 | /* "... & 0xff" implicitly done below */ |
| 383 | put_iac(x >> 8); |
| 384 | put_iac(x); |
| 385 | put_iac(y >> 8); |
| 386 | put_iac(y); |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 387 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 388 | put_iac(IAC); |
| 389 | put_iac(SE); |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 390 | } |
| 391 | #endif |
| 392 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 393 | static void setConMode(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 394 | { |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 395 | if (G.telflags & UF_ECHO) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 396 | if (G.charmode == CHM_TRY) { |
| 397 | G.charmode = CHM_ON; |
Denys Vlasenko | 57f07bf | 2012-09-17 11:53:09 +0200 | [diff] [blame] | 398 | printf("\r\nEntering %s mode" |
| 399 | "\r\nEscape character is '^%c'.\r\n", "character", ']'); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 400 | rawmode(); |
| 401 | } |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 402 | } else { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 403 | if (G.charmode != CHM_OFF) { |
| 404 | G.charmode = CHM_OFF; |
Denys Vlasenko | 57f07bf | 2012-09-17 11:53:09 +0200 | [diff] [blame] | 405 | printf("\r\nEntering %s mode" |
| 406 | "\r\nEscape character is '^%c'.\r\n", "line", 'C'); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 407 | cookmode(); |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 412 | static void will_charmode(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 413 | { |
| 414 | G.charmode = CHM_TRY; |
| 415 | G.telflags |= (UF_ECHO | UF_SGA); |
| 416 | setConMode(); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 417 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 418 | put_iac2(DO, TELOPT_ECHO); |
| 419 | put_iac2(DO, TELOPT_SGA); |
| 420 | iac_flush(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 421 | } |
| 422 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 423 | static void do_linemode(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 424 | { |
| 425 | G.charmode = CHM_TRY; |
| 426 | G.telflags &= ~(UF_ECHO | UF_SGA); |
| 427 | setConMode(); |
| 428 | |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 429 | put_iac2(DONT, TELOPT_ECHO); |
| 430 | put_iac2(DONT, TELOPT_SGA); |
| 431 | iac_flush(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 432 | } |
| 433 | |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 434 | static void to_notsup(char c) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 435 | { |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 436 | if (G.telwish == WILL) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 437 | put_iac2(DONT, c); |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 438 | else if (G.telwish == DO) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 439 | put_iac2(WONT, c); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 440 | } |
| 441 | |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 442 | static void to_echo(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 443 | { |
| 444 | /* if server requests ECHO, don't agree */ |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 445 | if (G.telwish == DO) { |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 446 | put_iac2(WONT, TELOPT_ECHO); |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 447 | return; |
| 448 | } |
| 449 | if (G.telwish == DONT) |
| 450 | return; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 451 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 452 | if (G.telflags & UF_ECHO) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 453 | if (G.telwish == WILL) |
| 454 | return; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 455 | } else if (G.telwish == WONT) |
| 456 | return; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 457 | |
| 458 | if (G.charmode != CHM_OFF) |
| 459 | G.telflags ^= UF_ECHO; |
| 460 | |
| 461 | if (G.telflags & UF_ECHO) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 462 | put_iac2(DO, TELOPT_ECHO); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 463 | else |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 464 | put_iac2(DONT, TELOPT_ECHO); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 465 | |
| 466 | setConMode(); |
Denys Vlasenko | 729ecb8 | 2010-06-07 14:14:26 +0200 | [diff] [blame] | 467 | full_write1_str("\r\n"); /* sudden modec */ |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 468 | } |
| 469 | |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 470 | static void to_sga(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 471 | { |
| 472 | /* daemon always sends will/wont, client do/dont */ |
| 473 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 474 | if (G.telflags & UF_SGA) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 475 | if (G.telwish == WILL) |
| 476 | return; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 477 | } else if (G.telwish == WONT) |
| 478 | return; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 479 | |
Denis Vlasenko | 1bec1b9 | 2007-11-06 02:23:39 +0000 | [diff] [blame] | 480 | G.telflags ^= UF_SGA; /* toggle */ |
| 481 | if (G.telflags & UF_SGA) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 482 | put_iac2(DO, TELOPT_SGA); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 483 | else |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 484 | put_iac2(DONT, TELOPT_SGA); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 485 | } |
| 486 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 487 | #if ENABLE_FEATURE_TELNET_TTYPE |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 488 | static void to_ttype(void) |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 489 | { |
| 490 | /* Tell server we will (or won't) do TTYPE */ |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 491 | if (G.ttype) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 492 | put_iac2(WILL, TELOPT_TTYPE); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 493 | else |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 494 | put_iac2(WONT, TELOPT_TTYPE); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 495 | } |
| 496 | #endif |
| 497 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 498 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 499 | static void to_new_environ(void) |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 500 | { |
| 501 | /* Tell server we will (or will not) do AUTOLOGIN */ |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 502 | if (G.autologin) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 503 | put_iac2(WILL, TELOPT_NEW_ENVIRON); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 504 | else |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 505 | put_iac2(WONT, TELOPT_NEW_ENVIRON); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 506 | } |
| 507 | #endif |
| 508 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 509 | #if ENABLE_FEATURE_AUTOWIDTH |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 510 | static void to_naws(void) |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 511 | { |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 512 | /* Tell server we will do NAWS */ |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 513 | put_iac2(WILL, TELOPT_NAWS); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 514 | } |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 515 | #endif |
| 516 | |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 517 | static void telopt(byte c) |
| 518 | { |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 519 | switch (c) { |
| 520 | case TELOPT_ECHO: |
| 521 | to_echo(); break; |
| 522 | case TELOPT_SGA: |
| 523 | to_sga(); break; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 524 | #if ENABLE_FEATURE_TELNET_TTYPE |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 525 | case TELOPT_TTYPE: |
| 526 | to_ttype(); break; |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 527 | #endif |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 528 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 529 | case TELOPT_NEW_ENVIRON: |
| 530 | to_new_environ(); break; |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 531 | #endif |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 532 | #if ENABLE_FEATURE_AUTOWIDTH |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 533 | case TELOPT_NAWS: |
| 534 | to_naws(); |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 535 | put_iac_naws(c, G.win_width, G.win_height); |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 536 | break; |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 537 | #endif |
Denis Vlasenko | baca175 | 2007-03-11 13:43:10 +0000 | [diff] [blame] | 538 | default: |
| 539 | to_notsup(c); |
| 540 | break; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 541 | } |
| 542 | } |
| 543 | |
Eric Andersen | 0e28e1f | 2002-04-26 07:20:47 +0000 | [diff] [blame] | 544 | /* subnegotiation -- ignore all (except TTYPE,NAWS) */ |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 545 | static void subneg(byte c) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 546 | { |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 547 | switch (G.telstate) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 548 | case TS_SUB1: |
| 549 | if (c == IAC) |
| 550 | G.telstate = TS_SUB2; |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 551 | #if ENABLE_FEATURE_TELNET_TTYPE |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 552 | else |
Denys Vlasenko | 25b10d9 | 2010-04-27 08:54:24 +0200 | [diff] [blame] | 553 | if (c == TELOPT_TTYPE && G.ttype) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 554 | put_iac_subopt(TELOPT_TTYPE, G.ttype); |
Eric Andersen | 7e1273e | 2001-05-07 17:57:45 +0000 | [diff] [blame] | 555 | #endif |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 556 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 557 | else |
Denys Vlasenko | 25b10d9 | 2010-04-27 08:54:24 +0200 | [diff] [blame] | 558 | if (c == TELOPT_NEW_ENVIRON && G.autologin) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 559 | put_iac_subopt_autologin(); |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 560 | #endif |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 561 | break; |
| 562 | case TS_SUB2: |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 563 | if (c == SE) { |
| 564 | G.telstate = TS_COPY; |
| 565 | return; |
| 566 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 567 | G.telstate = TS_SUB1; |
Denys Vlasenko | 036dbb9 | 2010-10-29 02:12:22 +0200 | [diff] [blame] | 568 | break; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 569 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 570 | } |
| 571 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 572 | static void rawmode(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 573 | { |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 574 | if (G.do_termios) |
| 575 | tcsetattr(0, TCSADRAIN, &G.termios_raw); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 576 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 577 | |
Eric Andersen | cd8c436 | 2001-11-10 11:22:46 +0000 | [diff] [blame] | 578 | static void cookmode(void) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 579 | { |
Denis Vlasenko | 54e3d1f | 2007-03-19 14:52:26 +0000 | [diff] [blame] | 580 | if (G.do_termios) |
| 581 | tcsetattr(0, TCSADRAIN, &G.termios_def); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 582 | } |
| 583 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 584 | int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | 1101d1c | 2008-07-21 09:22:28 +0000 | [diff] [blame] | 585 | int telnet_main(int argc UNUSED_PARAM, char **argv) |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 586 | { |
Denis Vlasenko | 9de420c | 2007-01-10 09:28:01 +0000 | [diff] [blame] | 587 | char *host; |
| 588 | int port; |
Glenn L McGrath | 78b0e37 | 2001-06-26 02:06:08 +0000 | [diff] [blame] | 589 | int len; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 590 | struct pollfd ufds[2]; |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 591 | |
Denis Vlasenko | 74324c8 | 2007-06-04 10:16:52 +0000 | [diff] [blame] | 592 | INIT_G(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 593 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 594 | #if ENABLE_FEATURE_AUTOWIDTH |
| 595 | get_terminal_width_height(0, &G.win_width, &G.win_height); |
| 596 | #endif |
| 597 | |
| 598 | #if ENABLE_FEATURE_TELNET_TTYPE |
| 599 | G.ttype = getenv("TERM"); |
| 600 | #endif |
| 601 | |
Paul Fox | f2ddc05 | 2005-07-20 19:55:19 +0000 | [diff] [blame] | 602 | if (tcgetattr(0, &G.termios_def) >= 0) { |
| 603 | G.do_termios = 1; |
Paul Fox | f2ddc05 | 2005-07-20 19:55:19 +0000 | [diff] [blame] | 604 | G.termios_raw = G.termios_def; |
| 605 | cfmakeraw(&G.termios_raw); |
| 606 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 607 | |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 608 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN |
Denis Vlasenko | fe7cd64 | 2007-08-18 15:32:12 +0000 | [diff] [blame] | 609 | if (1 & getopt32(argv, "al:", &G.autologin)) |
Denis Vlasenko | f24cdf1 | 2007-03-19 14:47:09 +0000 | [diff] [blame] | 610 | G.autologin = getenv("USER"); |
Denis Vlasenko | 6536a9b | 2007-01-12 10:35:23 +0000 | [diff] [blame] | 611 | argv += optind; |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 612 | #else |
Denis Vlasenko | 6536a9b | 2007-01-12 10:35:23 +0000 | [diff] [blame] | 613 | argv++; |
Eric Andersen | 539ffc9 | 2004-02-22 12:25:47 +0000 | [diff] [blame] | 614 | #endif |
Denis Vlasenko | 6536a9b | 2007-01-12 10:35:23 +0000 | [diff] [blame] | 615 | if (!*argv) |
| 616 | bb_show_usage(); |
| 617 | host = *argv++; |
| 618 | port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23); |
| 619 | if (*argv) /* extra params?? */ |
| 620 | bb_show_usage(); |
| 621 | |
Denis Vlasenko | 1101d1c | 2008-07-21 09:22:28 +0000 | [diff] [blame] | 622 | xmove_fd(create_and_connect_stream_or_die(host, port), netfd); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 623 | |
Denys Vlasenko | c52cbea | 2015-08-24 19:48:03 +0200 | [diff] [blame] | 624 | setsockopt_keepalive(netfd); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 625 | |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 626 | signal(SIGINT, record_signo); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 627 | |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 628 | ufds[0].fd = STDIN_FILENO; |
| 629 | ufds[0].events = POLLIN; |
| 630 | ufds[1].fd = netfd; |
| 631 | ufds[1].events = POLLIN; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 632 | |
Denis Vlasenko | 9de420c | 2007-01-10 09:28:01 +0000 | [diff] [blame] | 633 | while (1) { |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 634 | if (poll(ufds, 2, -1) < 0) { |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 635 | /* error, ignore and/or log something, bay go to loop */ |
Denis Vlasenko | 08ea11a | 2008-09-11 19:51:11 +0000 | [diff] [blame] | 636 | if (bb_got_signal) |
Denis Vlasenko | 9f2f808 | 2008-11-11 02:56:39 +0000 | [diff] [blame] | 637 | con_escape(); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 638 | else |
| 639 | sleep(1); |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 640 | continue; |
| 641 | } |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 642 | |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 643 | // FIXME: reads can block. Need full bidirectional buffering. |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 644 | |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 645 | if (ufds[0].revents) { |
| 646 | len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE); |
| 647 | if (len <= 0) |
| 648 | doexit(EXIT_SUCCESS); |
| 649 | TRACE(0, ("Read con: %d\n", len)); |
| 650 | handle_net_output(len); |
| 651 | } |
| 652 | |
| 653 | if (ufds[1].revents) { |
| 654 | len = safe_read(netfd, G.buf, DATABUFSIZE); |
| 655 | if (len <= 0) { |
| 656 | full_write1_str("Connection closed by foreign host\r\n"); |
| 657 | doexit(EXIT_FAILURE); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 658 | } |
Denys Vlasenko | ec07420 | 2010-10-29 02:33:38 +0200 | [diff] [blame] | 659 | TRACE(0, ("Read netfd (%d): %d\n", netfd, len)); |
| 660 | handle_net_input(len); |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 661 | } |
Denis Vlasenko | 1101d1c | 2008-07-21 09:22:28 +0000 | [diff] [blame] | 662 | } /* while (1) */ |
Eric Andersen | 28c70b3 | 2000-06-14 20:42:57 +0000 | [diff] [blame] | 663 | } |