[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * telnet implementation for busybox
|
---|
| 4 | *
|
---|
| 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
|
---|
| 10 | *
|
---|
[2725] | 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[821] | 12 | *
|
---|
| 13 | * HISTORY
|
---|
| 14 | * Revision 3.1 1994/04/17 11:31:54 too
|
---|
| 15 | * initial revision
|
---|
| 16 | * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org>
|
---|
| 17 | * Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan
|
---|
| 18 | * <jam@ltsp.org>
|
---|
| 19 | * Modified 2004/02/11 to add ability to pass the USER variable to remote host
|
---|
| 20 | * by Fernando Silveira <swrh@gmx.net>
|
---|
| 21 | *
|
---|
| 22 | */
|
---|
| 23 |
|
---|
[3232] | 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"
|
---|
| 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 |
|
---|
[821] | 39 | #include <arpa/telnet.h>
|
---|
| 40 | #include <netinet/in.h>
|
---|
[1765] | 41 | #include "libbb.h"
|
---|
[821] | 42 |
|
---|
[3232] | 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 |
|
---|
[821] | 58 | #ifdef DOTRACE
|
---|
[3232] | 59 | # define TRACE(x, y) do { if (x) printf y; } while (0)
|
---|
[821] | 60 | #else
|
---|
[3232] | 61 | # define TRACE(x, y)
|
---|
[821] | 62 | #endif
|
---|
| 63 |
|
---|
[1765] | 64 | enum {
|
---|
| 65 | DATABUFSIZE = 128,
|
---|
| 66 | IACBUFSIZE = 128,
|
---|
[821] | 67 |
|
---|
| 68 | CHM_TRY = 0,
|
---|
| 69 | CHM_ON = 1,
|
---|
| 70 | CHM_OFF = 2,
|
---|
| 71 |
|
---|
| 72 | UF_ECHO = 0x01,
|
---|
| 73 | UF_SGA = 0x02,
|
---|
| 74 |
|
---|
[2725] | 75 | TS_NORMAL = 0,
|
---|
| 76 | TS_COPY = 1,
|
---|
[821] | 77 | TS_IAC = 2,
|
---|
| 78 | TS_OPT = 3,
|
---|
| 79 | TS_SUB1 = 4,
|
---|
| 80 | TS_SUB2 = 5,
|
---|
[2725] | 81 | TS_CR = 6,
|
---|
[821] | 82 | };
|
---|
| 83 |
|
---|
| 84 | typedef unsigned char byte;
|
---|
| 85 |
|
---|
[2725] | 86 | enum { netfd = 3 };
|
---|
| 87 |
|
---|
[1765] | 88 | struct globals {
|
---|
[2725] | 89 | int iaclen; /* could even use byte, but it's a loss on x86 */
|
---|
[821] | 90 | byte telstate; /* telnet negotiation state from network input */
|
---|
| 91 | byte telwish; /* DO, DONT, WILL, WONT */
|
---|
| 92 | byte charmode;
|
---|
| 93 | byte telflags;
|
---|
| 94 | byte do_termios;
|
---|
[1765] | 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
|
---|
[2725] | 102 | unsigned win_width, win_height;
|
---|
[1765] | 103 | #endif
|
---|
| 104 | /* same buffer used both for network and console read/write */
|
---|
| 105 | char buf[DATABUFSIZE];
|
---|
[821] | 106 | /* buffer to handle telnet negotiations */
|
---|
| 107 | char iacbuf[IACBUFSIZE];
|
---|
| 108 | struct termios termios_def;
|
---|
| 109 | struct termios termios_raw;
|
---|
[2725] | 110 | } FIX_ALIASING;
|
---|
[1765] | 111 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
| 112 | #define INIT_G() do { \
|
---|
[2725] | 113 | struct G_sizecheck { \
|
---|
| 114 | char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
|
---|
| 115 | }; \
|
---|
[1765] | 116 | } while (0)
|
---|
[821] | 117 |
|
---|
[2725] | 118 |
|
---|
[821] | 119 | static void rawmode(void);
|
---|
| 120 | static void cookmode(void);
|
---|
| 121 | static void do_linemode(void);
|
---|
| 122 | static void will_charmode(void);
|
---|
| 123 | static void telopt(byte c);
|
---|
[2725] | 124 | static void subneg(byte c);
|
---|
[821] | 125 |
|
---|
[2725] | 126 | static void iac_flush(void)
|
---|
[1765] | 127 | {
|
---|
[2725] | 128 | write(netfd, G.iacbuf, G.iaclen);
|
---|
[1765] | 129 | G.iaclen = 0;
|
---|
| 130 | }
|
---|
[821] | 131 |
|
---|
[1765] | 132 | #define write_str(fd, str) write(fd, str, sizeof(str) - 1)
|
---|
[821] | 133 |
|
---|
[2725] | 134 | static void doexit(int ev) NORETURN;
|
---|
[821] | 135 | static void doexit(int ev)
|
---|
| 136 | {
|
---|
| 137 | cookmode();
|
---|
| 138 | exit(ev);
|
---|
| 139 | }
|
---|
| 140 |
|
---|
[2725] | 141 | static void con_escape(void)
|
---|
[821] | 142 | {
|
---|
| 143 | char b;
|
---|
| 144 |
|
---|
[2725] | 145 | if (bb_got_signal) /* came from line mode... go raw */
|
---|
[821] | 146 | rawmode();
|
---|
| 147 |
|
---|
[1765] | 148 | write_str(1, "\r\nConsole escape. Commands are:\r\n\n"
|
---|
[821] | 149 | " l go to line mode\r\n"
|
---|
| 150 | " c go to character mode\r\n"
|
---|
| 151 | " z suspend telnet\r\n"
|
---|
| 152 | " e exit telnet\r\n");
|
---|
| 153 |
|
---|
[2725] | 154 | if (read(STDIN_FILENO, &b, 1) <= 0)
|
---|
| 155 | doexit(EXIT_FAILURE);
|
---|
[821] | 156 |
|
---|
[1765] | 157 | switch (b) {
|
---|
[821] | 158 | case 'l':
|
---|
[2725] | 159 | if (!bb_got_signal) {
|
---|
[821] | 160 | do_linemode();
|
---|
[2725] | 161 | goto ret;
|
---|
[821] | 162 | }
|
---|
| 163 | break;
|
---|
| 164 | case 'c':
|
---|
[2725] | 165 | if (bb_got_signal) {
|
---|
[821] | 166 | will_charmode();
|
---|
[2725] | 167 | goto ret;
|
---|
[821] | 168 | }
|
---|
| 169 | break;
|
---|
| 170 | case 'z':
|
---|
| 171 | cookmode();
|
---|
| 172 | kill(0, SIGTSTP);
|
---|
| 173 | rawmode();
|
---|
| 174 | break;
|
---|
| 175 | case 'e':
|
---|
[2725] | 176 | doexit(EXIT_SUCCESS);
|
---|
[821] | 177 | }
|
---|
| 178 |
|
---|
[1765] | 179 | write_str(1, "continuing...\r\n");
|
---|
[821] | 180 |
|
---|
[2725] | 181 | if (bb_got_signal)
|
---|
[821] | 182 | cookmode();
|
---|
[2725] | 183 | ret:
|
---|
| 184 | bb_got_signal = 0;
|
---|
[821] | 185 | }
|
---|
[1765] | 186 |
|
---|
[2725] | 187 | static void handle_net_output(int len)
|
---|
[821] | 188 | {
|
---|
[2725] | 189 | byte outbuf[2 * DATABUFSIZE];
|
---|
[3232] | 190 | byte *dst = outbuf;
|
---|
| 191 | byte *src = (byte*)G.buf;
|
---|
| 192 | byte *end = src + len;
|
---|
[821] | 193 |
|
---|
[3232] | 194 | while (src < end) {
|
---|
| 195 | byte c = *src++;
|
---|
[2725] | 196 | if (c == 0x1d) {
|
---|
| 197 | con_escape();
|
---|
[821] | 198 | return;
|
---|
| 199 | }
|
---|
[3232] | 200 | *dst = c;
|
---|
[2725] | 201 | if (c == IAC)
|
---|
[3232] | 202 | *++dst = c; /* IAC -> IAC IAC */
|
---|
| 203 | else
|
---|
| 204 | if (c == '\r' || c == '\n') {
|
---|
| 205 | /* Enter key sends '\r' in raw mode and '\n' in cooked one.
|
---|
| 206 | *
|
---|
| 207 | * See RFC 1123 3.3.1 Telnet End-of-Line Convention.
|
---|
| 208 | * Using CR LF instead of other allowed possibilities
|
---|
| 209 | * like CR NUL - easier to talk to HTTP/SMTP servers.
|
---|
| 210 | */
|
---|
| 211 | *dst = '\r'; /* Enter -> CR LF */
|
---|
| 212 | *++dst = '\n';
|
---|
| 213 | }
|
---|
| 214 | dst++;
|
---|
[821] | 215 | }
|
---|
[3232] | 216 | if (dst - outbuf != 0)
|
---|
| 217 | full_write(netfd, outbuf, dst - outbuf);
|
---|
[821] | 218 | }
|
---|
| 219 |
|
---|
[2725] | 220 | static void handle_net_input(int len)
|
---|
[821] | 221 | {
|
---|
| 222 | int i;
|
---|
| 223 | int cstart = 0;
|
---|
| 224 |
|
---|
[2725] | 225 | for (i = 0; i < len; i++) {
|
---|
[821] | 226 | byte c = G.buf[i];
|
---|
| 227 |
|
---|
[2725] | 228 | if (G.telstate == TS_NORMAL) { /* most typical state */
|
---|
| 229 | if (c == IAC) {
|
---|
[821] | 230 | cstart = i;
|
---|
| 231 | G.telstate = TS_IAC;
|
---|
| 232 | }
|
---|
[2725] | 233 | else if (c == '\r') {
|
---|
| 234 | cstart = i + 1;
|
---|
| 235 | G.telstate = TS_CR;
|
---|
| 236 | }
|
---|
| 237 | /* No IACs were seen so far, no need to copy
|
---|
| 238 | * bytes within G.buf: */
|
---|
| 239 | continue;
|
---|
[821] | 240 | }
|
---|
| 241 |
|
---|
[2725] | 242 | switch (G.telstate) {
|
---|
| 243 | case TS_CR:
|
---|
| 244 | /* Prev char was CR. If cur one is NUL, ignore it.
|
---|
| 245 | * See RFC 1123 section 3.3.1 for discussion of telnet EOL handling.
|
---|
| 246 | */
|
---|
| 247 | G.telstate = TS_COPY;
|
---|
| 248 | if (c == '\0')
|
---|
| 249 | break;
|
---|
| 250 | /* else: fall through - need to handle CR IAC ... properly */
|
---|
| 251 |
|
---|
| 252 | case TS_COPY: /* Prev char was ordinary */
|
---|
| 253 | /* Similar to NORMAL, but in TS_COPY we need to copy bytes */
|
---|
| 254 | if (c == IAC)
|
---|
| 255 | G.telstate = TS_IAC;
|
---|
| 256 | else
|
---|
| 257 | G.buf[cstart++] = c;
|
---|
| 258 | if (c == '\r')
|
---|
| 259 | G.telstate = TS_CR;
|
---|
| 260 | break;
|
---|
| 261 |
|
---|
| 262 | case TS_IAC: /* Prev char was IAC */
|
---|
| 263 | if (c == IAC) { /* IAC IAC -> one IAC */
|
---|
| 264 | G.buf[cstart++] = c;
|
---|
| 265 | G.telstate = TS_COPY;
|
---|
| 266 | break;
|
---|
| 267 | }
|
---|
| 268 | /* else */
|
---|
| 269 | switch (c) {
|
---|
| 270 | case SB:
|
---|
| 271 | G.telstate = TS_SUB1;
|
---|
| 272 | break;
|
---|
| 273 | case DO:
|
---|
| 274 | case DONT:
|
---|
| 275 | case WILL:
|
---|
| 276 | case WONT:
|
---|
| 277 | G.telwish = c;
|
---|
| 278 | G.telstate = TS_OPT;
|
---|
| 279 | break;
|
---|
| 280 | /* DATA MARK must be added later */
|
---|
| 281 | default:
|
---|
| 282 | G.telstate = TS_COPY;
|
---|
| 283 | }
|
---|
| 284 | break;
|
---|
| 285 |
|
---|
| 286 | case TS_OPT: /* Prev chars were IAC WILL/WONT/DO/DONT */
|
---|
| 287 | telopt(c);
|
---|
| 288 | G.telstate = TS_COPY;
|
---|
| 289 | break;
|
---|
| 290 |
|
---|
| 291 | case TS_SUB1: /* Subnegotiation */
|
---|
| 292 | case TS_SUB2: /* Subnegotiation */
|
---|
| 293 | subneg(c); /* can change G.telstate */
|
---|
| 294 | break;
|
---|
| 295 | }
|
---|
[821] | 296 | }
|
---|
| 297 |
|
---|
[2725] | 298 | if (G.telstate != TS_NORMAL) {
|
---|
| 299 | /* We had some IACs, or CR */
|
---|
| 300 | if (G.iaclen)
|
---|
| 301 | iac_flush();
|
---|
| 302 | if (G.telstate == TS_COPY) /* we aren't in the middle of IAC */
|
---|
| 303 | G.telstate = TS_NORMAL;
|
---|
[821] | 304 | len = cstart;
|
---|
| 305 | }
|
---|
| 306 |
|
---|
| 307 | if (len)
|
---|
[2725] | 308 | full_write(STDOUT_FILENO, G.buf, len);
|
---|
[821] | 309 | }
|
---|
| 310 |
|
---|
[2725] | 311 | static void put_iac(int c)
|
---|
[821] | 312 | {
|
---|
| 313 | G.iacbuf[G.iaclen++] = c;
|
---|
| 314 | }
|
---|
| 315 |
|
---|
[2725] | 316 | static void put_iac2(byte wwdd, byte c)
|
---|
[821] | 317 | {
|
---|
| 318 | if (G.iaclen + 3 > IACBUFSIZE)
|
---|
[2725] | 319 | iac_flush();
|
---|
[821] | 320 |
|
---|
[2725] | 321 | put_iac(IAC);
|
---|
| 322 | put_iac(wwdd);
|
---|
| 323 | put_iac(c);
|
---|
[821] | 324 | }
|
---|
| 325 |
|
---|
[1765] | 326 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
[2725] | 327 | static void put_iac_subopt(byte c, char *str)
|
---|
[821] | 328 | {
|
---|
[2725] | 329 | int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
|
---|
[821] | 330 |
|
---|
| 331 | if (G.iaclen + len > IACBUFSIZE)
|
---|
[2725] | 332 | iac_flush();
|
---|
[821] | 333 |
|
---|
[2725] | 334 | put_iac(IAC);
|
---|
| 335 | put_iac(SB);
|
---|
| 336 | put_iac(c);
|
---|
| 337 | put_iac(0);
|
---|
[821] | 338 |
|
---|
[1765] | 339 | while (*str)
|
---|
[2725] | 340 | put_iac(*str++);
|
---|
[821] | 341 |
|
---|
[2725] | 342 | put_iac(IAC);
|
---|
| 343 | put_iac(SE);
|
---|
[821] | 344 | }
|
---|
| 345 | #endif
|
---|
| 346 |
|
---|
[1765] | 347 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
[2725] | 348 | static void put_iac_subopt_autologin(void)
|
---|
[821] | 349 | {
|
---|
[1765] | 350 | int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
|
---|
[2725] | 351 | const char *p = "USER";
|
---|
[821] | 352 |
|
---|
| 353 | if (G.iaclen + len > IACBUFSIZE)
|
---|
[2725] | 354 | iac_flush();
|
---|
[821] | 355 |
|
---|
[2725] | 356 | put_iac(IAC);
|
---|
| 357 | put_iac(SB);
|
---|
| 358 | put_iac(TELOPT_NEW_ENVIRON);
|
---|
| 359 | put_iac(TELQUAL_IS);
|
---|
| 360 | put_iac(NEW_ENV_VAR);
|
---|
[821] | 361 |
|
---|
[2725] | 362 | while (*p)
|
---|
| 363 | put_iac(*p++);
|
---|
[821] | 364 |
|
---|
[2725] | 365 | put_iac(NEW_ENV_VALUE);
|
---|
[821] | 366 |
|
---|
[2725] | 367 | p = G.autologin;
|
---|
| 368 | while (*p)
|
---|
| 369 | put_iac(*p++);
|
---|
[821] | 370 |
|
---|
[2725] | 371 | put_iac(IAC);
|
---|
| 372 | put_iac(SE);
|
---|
[821] | 373 | }
|
---|
| 374 | #endif
|
---|
| 375 |
|
---|
[1765] | 376 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
[2725] | 377 | static void put_iac_naws(byte c, int x, int y)
|
---|
[821] | 378 | {
|
---|
| 379 | if (G.iaclen + 9 > IACBUFSIZE)
|
---|
[2725] | 380 | iac_flush();
|
---|
[821] | 381 |
|
---|
[2725] | 382 | put_iac(IAC);
|
---|
| 383 | put_iac(SB);
|
---|
| 384 | put_iac(c);
|
---|
[821] | 385 |
|
---|
[2725] | 386 | put_iac((x >> 8) & 0xff);
|
---|
| 387 | put_iac(x & 0xff);
|
---|
| 388 | put_iac((y >> 8) & 0xff);
|
---|
| 389 | put_iac(y & 0xff);
|
---|
[821] | 390 |
|
---|
[2725] | 391 | put_iac(IAC);
|
---|
| 392 | put_iac(SE);
|
---|
[821] | 393 | }
|
---|
| 394 | #endif
|
---|
| 395 |
|
---|
| 396 | static void setConMode(void)
|
---|
| 397 | {
|
---|
[1765] | 398 | if (G.telflags & UF_ECHO) {
|
---|
[821] | 399 | if (G.charmode == CHM_TRY) {
|
---|
| 400 | G.charmode = CHM_ON;
|
---|
[3232] | 401 | printf("\r\nEntering %s mode"
|
---|
| 402 | "\r\nEscape character is '^%c'.\r\n", "character", ']');
|
---|
[821] | 403 | rawmode();
|
---|
| 404 | }
|
---|
[1765] | 405 | } else {
|
---|
[821] | 406 | if (G.charmode != CHM_OFF) {
|
---|
| 407 | G.charmode = CHM_OFF;
|
---|
[3232] | 408 | printf("\r\nEntering %s mode"
|
---|
| 409 | "\r\nEscape character is '^%c'.\r\n", "line", 'C');
|
---|
[821] | 410 | cookmode();
|
---|
| 411 | }
|
---|
| 412 | }
|
---|
| 413 | }
|
---|
| 414 |
|
---|
| 415 | static void will_charmode(void)
|
---|
| 416 | {
|
---|
| 417 | G.charmode = CHM_TRY;
|
---|
| 418 | G.telflags |= (UF_ECHO | UF_SGA);
|
---|
| 419 | setConMode();
|
---|
| 420 |
|
---|
[2725] | 421 | put_iac2(DO, TELOPT_ECHO);
|
---|
| 422 | put_iac2(DO, TELOPT_SGA);
|
---|
| 423 | iac_flush();
|
---|
[821] | 424 | }
|
---|
| 425 |
|
---|
| 426 | static void do_linemode(void)
|
---|
| 427 | {
|
---|
| 428 | G.charmode = CHM_TRY;
|
---|
| 429 | G.telflags &= ~(UF_ECHO | UF_SGA);
|
---|
| 430 | setConMode();
|
---|
| 431 |
|
---|
[2725] | 432 | put_iac2(DONT, TELOPT_ECHO);
|
---|
| 433 | put_iac2(DONT, TELOPT_SGA);
|
---|
| 434 | iac_flush();
|
---|
[821] | 435 | }
|
---|
| 436 |
|
---|
[1765] | 437 | static void to_notsup(char c)
|
---|
[821] | 438 | {
|
---|
[1765] | 439 | if (G.telwish == WILL)
|
---|
[2725] | 440 | put_iac2(DONT, c);
|
---|
[1765] | 441 | else if (G.telwish == DO)
|
---|
[2725] | 442 | put_iac2(WONT, c);
|
---|
[821] | 443 | }
|
---|
| 444 |
|
---|
[1765] | 445 | static void to_echo(void)
|
---|
[821] | 446 | {
|
---|
| 447 | /* if server requests ECHO, don't agree */
|
---|
[1765] | 448 | if (G.telwish == DO) {
|
---|
[2725] | 449 | put_iac2(WONT, TELOPT_ECHO);
|
---|
[1765] | 450 | return;
|
---|
| 451 | }
|
---|
| 452 | if (G.telwish == DONT)
|
---|
| 453 | return;
|
---|
[821] | 454 |
|
---|
[1765] | 455 | if (G.telflags & UF_ECHO) {
|
---|
[821] | 456 | if (G.telwish == WILL)
|
---|
| 457 | return;
|
---|
[1765] | 458 | } else if (G.telwish == WONT)
|
---|
| 459 | return;
|
---|
[821] | 460 |
|
---|
| 461 | if (G.charmode != CHM_OFF)
|
---|
| 462 | G.telflags ^= UF_ECHO;
|
---|
| 463 |
|
---|
| 464 | if (G.telflags & UF_ECHO)
|
---|
[2725] | 465 | put_iac2(DO, TELOPT_ECHO);
|
---|
[821] | 466 | else
|
---|
[2725] | 467 | put_iac2(DONT, TELOPT_ECHO);
|
---|
[821] | 468 |
|
---|
| 469 | setConMode();
|
---|
[2725] | 470 | full_write1_str("\r\n"); /* sudden modec */
|
---|
[821] | 471 | }
|
---|
| 472 |
|
---|
[1765] | 473 | static void to_sga(void)
|
---|
[821] | 474 | {
|
---|
| 475 | /* daemon always sends will/wont, client do/dont */
|
---|
| 476 |
|
---|
[1765] | 477 | if (G.telflags & UF_SGA) {
|
---|
[821] | 478 | if (G.telwish == WILL)
|
---|
| 479 | return;
|
---|
[1765] | 480 | } else if (G.telwish == WONT)
|
---|
| 481 | return;
|
---|
[821] | 482 |
|
---|
[2725] | 483 | G.telflags ^= UF_SGA; /* toggle */
|
---|
| 484 | if (G.telflags & UF_SGA)
|
---|
| 485 | put_iac2(DO, TELOPT_SGA);
|
---|
[821] | 486 | else
|
---|
[2725] | 487 | put_iac2(DONT, TELOPT_SGA);
|
---|
[821] | 488 | }
|
---|
| 489 |
|
---|
[1765] | 490 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
| 491 | static void to_ttype(void)
|
---|
[821] | 492 | {
|
---|
| 493 | /* Tell server we will (or won't) do TTYPE */
|
---|
[1765] | 494 | if (G.ttype)
|
---|
[2725] | 495 | put_iac2(WILL, TELOPT_TTYPE);
|
---|
[821] | 496 | else
|
---|
[2725] | 497 | put_iac2(WONT, TELOPT_TTYPE);
|
---|
[821] | 498 | }
|
---|
| 499 | #endif
|
---|
| 500 |
|
---|
[1765] | 501 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
| 502 | static void to_new_environ(void)
|
---|
[821] | 503 | {
|
---|
| 504 | /* Tell server we will (or will not) do AUTOLOGIN */
|
---|
[1765] | 505 | if (G.autologin)
|
---|
[2725] | 506 | put_iac2(WILL, TELOPT_NEW_ENVIRON);
|
---|
[821] | 507 | else
|
---|
[2725] | 508 | put_iac2(WONT, TELOPT_NEW_ENVIRON);
|
---|
[821] | 509 | }
|
---|
| 510 | #endif
|
---|
| 511 |
|
---|
[1765] | 512 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 513 | static void to_naws(void)
|
---|
[821] | 514 | {
|
---|
| 515 | /* Tell server we will do NAWS */
|
---|
[2725] | 516 | put_iac2(WILL, TELOPT_NAWS);
|
---|
[821] | 517 | }
|
---|
| 518 | #endif
|
---|
| 519 |
|
---|
| 520 | static void telopt(byte c)
|
---|
| 521 | {
|
---|
[1765] | 522 | switch (c) {
|
---|
| 523 | case TELOPT_ECHO:
|
---|
| 524 | to_echo(); break;
|
---|
| 525 | case TELOPT_SGA:
|
---|
| 526 | to_sga(); break;
|
---|
| 527 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
| 528 | case TELOPT_TTYPE:
|
---|
| 529 | to_ttype(); break;
|
---|
[821] | 530 | #endif
|
---|
[1765] | 531 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
| 532 | case TELOPT_NEW_ENVIRON:
|
---|
| 533 | to_new_environ(); break;
|
---|
[821] | 534 | #endif
|
---|
[1765] | 535 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 536 | case TELOPT_NAWS:
|
---|
| 537 | to_naws();
|
---|
[2725] | 538 | put_iac_naws(c, G.win_width, G.win_height);
|
---|
[1765] | 539 | break;
|
---|
[821] | 540 | #endif
|
---|
[1765] | 541 | default:
|
---|
| 542 | to_notsup(c);
|
---|
| 543 | break;
|
---|
[821] | 544 | }
|
---|
| 545 | }
|
---|
| 546 |
|
---|
| 547 | /* subnegotiation -- ignore all (except TTYPE,NAWS) */
|
---|
[2725] | 548 | static void subneg(byte c)
|
---|
[821] | 549 | {
|
---|
[1765] | 550 | switch (G.telstate) {
|
---|
[821] | 551 | case TS_SUB1:
|
---|
| 552 | if (c == IAC)
|
---|
| 553 | G.telstate = TS_SUB2;
|
---|
[1765] | 554 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
[821] | 555 | else
|
---|
[2725] | 556 | if (c == TELOPT_TTYPE && G.ttype)
|
---|
| 557 | put_iac_subopt(TELOPT_TTYPE, G.ttype);
|
---|
[821] | 558 | #endif
|
---|
[1765] | 559 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
[821] | 560 | else
|
---|
[2725] | 561 | if (c == TELOPT_NEW_ENVIRON && G.autologin)
|
---|
| 562 | put_iac_subopt_autologin();
|
---|
[821] | 563 | #endif
|
---|
| 564 | break;
|
---|
| 565 | case TS_SUB2:
|
---|
[2725] | 566 | if (c == SE) {
|
---|
| 567 | G.telstate = TS_COPY;
|
---|
| 568 | return;
|
---|
| 569 | }
|
---|
[821] | 570 | G.telstate = TS_SUB1;
|
---|
[2725] | 571 | break;
|
---|
[821] | 572 | }
|
---|
| 573 | }
|
---|
| 574 |
|
---|
| 575 | static void rawmode(void)
|
---|
| 576 | {
|
---|
[1765] | 577 | if (G.do_termios)
|
---|
| 578 | tcsetattr(0, TCSADRAIN, &G.termios_raw);
|
---|
[821] | 579 | }
|
---|
| 580 |
|
---|
| 581 | static void cookmode(void)
|
---|
| 582 | {
|
---|
[1765] | 583 | if (G.do_termios)
|
---|
| 584 | tcsetattr(0, TCSADRAIN, &G.termios_def);
|
---|
[821] | 585 | }
|
---|
| 586 |
|
---|
[2725] | 587 | int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 588 | int telnet_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 589 | {
|
---|
[1765] | 590 | char *host;
|
---|
| 591 | int port;
|
---|
[821] | 592 | int len;
|
---|
| 593 | struct pollfd ufds[2];
|
---|
| 594 |
|
---|
[1765] | 595 | INIT_G();
|
---|
| 596 |
|
---|
| 597 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 598 | get_terminal_width_height(0, &G.win_width, &G.win_height);
|
---|
[821] | 599 | #endif
|
---|
| 600 |
|
---|
[1765] | 601 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
| 602 | G.ttype = getenv("TERM");
|
---|
[821] | 603 | #endif
|
---|
| 604 |
|
---|
| 605 | if (tcgetattr(0, &G.termios_def) >= 0) {
|
---|
| 606 | G.do_termios = 1;
|
---|
| 607 | G.termios_raw = G.termios_def;
|
---|
| 608 | cfmakeraw(&G.termios_raw);
|
---|
| 609 | }
|
---|
| 610 |
|
---|
[1765] | 611 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
| 612 | if (1 & getopt32(argv, "al:", &G.autologin))
|
---|
| 613 | G.autologin = getenv("USER");
|
---|
| 614 | argv += optind;
|
---|
[821] | 615 | #else
|
---|
[1765] | 616 | argv++;
|
---|
[821] | 617 | #endif
|
---|
[1765] | 618 | if (!*argv)
|
---|
| 619 | bb_show_usage();
|
---|
| 620 | host = *argv++;
|
---|
| 621 | port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23);
|
---|
| 622 | if (*argv) /* extra params?? */
|
---|
| 623 | bb_show_usage();
|
---|
[821] | 624 |
|
---|
[2725] | 625 | xmove_fd(create_and_connect_stream_or_die(host, port), netfd);
|
---|
[821] | 626 |
|
---|
[2725] | 627 | setsockopt(netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
|
---|
[821] | 628 |
|
---|
[2725] | 629 | signal(SIGINT, record_signo);
|
---|
[821] | 630 |
|
---|
[2725] | 631 | ufds[0].fd = STDIN_FILENO;
|
---|
| 632 | ufds[0].events = POLLIN;
|
---|
| 633 | ufds[1].fd = netfd;
|
---|
| 634 | ufds[1].events = POLLIN;
|
---|
[821] | 635 |
|
---|
[1765] | 636 | while (1) {
|
---|
[2725] | 637 | if (poll(ufds, 2, -1) < 0) {
|
---|
[821] | 638 | /* error, ignore and/or log something, bay go to loop */
|
---|
[2725] | 639 | if (bb_got_signal)
|
---|
| 640 | con_escape();
|
---|
[821] | 641 | else
|
---|
| 642 | sleep(1);
|
---|
[2725] | 643 | continue;
|
---|
| 644 | }
|
---|
[821] | 645 |
|
---|
[2725] | 646 | // FIXME: reads can block. Need full bidirectional buffering.
|
---|
[821] | 647 |
|
---|
[2725] | 648 | if (ufds[0].revents) {
|
---|
| 649 | len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE);
|
---|
| 650 | if (len <= 0)
|
---|
| 651 | doexit(EXIT_SUCCESS);
|
---|
| 652 | TRACE(0, ("Read con: %d\n", len));
|
---|
| 653 | handle_net_output(len);
|
---|
| 654 | }
|
---|
| 655 |
|
---|
| 656 | if (ufds[1].revents) {
|
---|
| 657 | len = safe_read(netfd, G.buf, DATABUFSIZE);
|
---|
| 658 | if (len <= 0) {
|
---|
| 659 | full_write1_str("Connection closed by foreign host\r\n");
|
---|
| 660 | doexit(EXIT_FAILURE);
|
---|
[821] | 661 | }
|
---|
[2725] | 662 | TRACE(0, ("Read netfd (%d): %d\n", netfd, len));
|
---|
| 663 | handle_net_input(len);
|
---|
[821] | 664 | }
|
---|
[2725] | 665 | } /* while (1) */
|
---|
[821] | 666 | }
|
---|