| 1 | /* |
| 2 | * Copyright (c) 1983 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef lint |
| 35 | char copyright[] = |
| 36 | "@(#) Copyright (c) 1983 The Regents of the University of California.\n\ |
| 37 | All rights reserved.\n"; |
| 38 | #endif /* not lint */ |
| 39 | |
| 40 | #ifndef lint |
| 41 | static char sccsid[] = "@(#)tip.c 5.15 (Berkeley) 2/4/91"; |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | /* |
| 45 | * tip - UNIX link to other systems |
| 46 | * tip [-v] [-speed] system-name |
| 47 | * or |
| 48 | * cu phone-number [-s speed] [-l line] [-a acu] |
| 49 | */ |
| 50 | #include "tip.h" |
| 51 | #include "pathnames.h" |
| 52 | |
| 53 | /* |
| 54 | * Baud rate mapping table |
| 55 | */ |
| 56 | int bauds[] = { |
| 57 | 0, 50, 75, 110, 134, 150, 200, 300, 600, |
| 58 | 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, -1 |
| 59 | }; |
| 60 | |
| 61 | int disc = OTTYDISC; /* tip normally runs this way */ |
| 62 | void intprompt(); |
| 63 | void timeout(); |
| 64 | void cleanup(); |
| 65 | char *sname(); |
| 66 | char PNbuf[256]; /* This limits the size of a number */ |
| 67 | |
| 68 | main(argc, argv) |
| 69 | char *argv[]; |
| 70 | { |
| 71 | char *system = NOSTR; |
| 72 | register int i; |
| 73 | register char *p; |
| 74 | char sbuf[12]; |
| 75 | |
| 76 | gid = getgid(); |
| 77 | egid = getegid(); |
| 78 | uid = getuid(); |
| 79 | euid = geteuid(); |
| 80 | if (equal(sname(argv[0]), "cu")) { |
| 81 | cumode = 1; |
| 82 | cumain(argc, argv); |
| 83 | goto cucommon; |
| 84 | } |
| 85 | |
| 86 | if (argc > 4) { |
| 87 | fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n"); |
| 88 | exit(1); |
| 89 | } |
| 90 | if (!isatty(0)) { |
| 91 | fprintf(stderr, "tip: must be interactive\n"); |
| 92 | exit(1); |
| 93 | } |
| 94 | |
| 95 | for (; argc > 1; argv++, argc--) { |
| 96 | if (argv[1][0] != '-') |
| 97 | system = argv[1]; |
| 98 | else switch (argv[1][1]) { |
| 99 | |
| 100 | case 'v': |
| 101 | vflag++; |
| 102 | break; |
| 103 | |
| 104 | case '0': case '1': case '2': case '3': case '4': |
| 105 | case '5': case '6': case '7': case '8': case '9': |
| 106 | BR = atoi(&argv[1][1]); |
| 107 | break; |
| 108 | |
| 109 | default: |
| 110 | fprintf(stderr, "tip: %s, unknown option\n", argv[1]); |
| 111 | break; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | if (system == NOSTR) |
| 116 | goto notnumber; |
| 117 | if (isalpha(*system)) |
| 118 | goto notnumber; |
| 119 | /* |
| 120 | * System name is really a phone number... |
| 121 | * Copy the number then stomp on the original (in case the number |
| 122 | * is private, we don't want 'ps' or 'w' to find it). |
| 123 | */ |
| 124 | if (strlen(system) > sizeof PNbuf - 1) { |
| 125 | fprintf(stderr, "tip: phone number too long (max = %d bytes)\n", |
| 126 | sizeof PNbuf - 1); |
| 127 | exit(1); |
| 128 | } |
| 129 | strncpy( PNbuf, system, sizeof PNbuf - 1 ); |
| 130 | for (p = system; *p; p++) |
| 131 | *p = '\0'; |
| 132 | PN = PNbuf; |
| 133 | (void)sprintf(sbuf, "tip%d", BR); |
| 134 | system = sbuf; |
| 135 | |
| 136 | notnumber: |
| 137 | (void)signal(SIGINT, cleanup); |
| 138 | (void)signal(SIGQUIT, cleanup); |
| 139 | (void)signal(SIGHUP, cleanup); |
| 140 | (void)signal(SIGTERM, cleanup); |
| 141 | |
| 142 | if ((i = hunt(system)) == 0) { |
| 143 | printf("all ports busy\n"); |
| 144 | exit(3); |
| 145 | } |
| 146 | if (i == -1) { |
| 147 | printf("link down\n"); |
| 148 | (void)uu_unlock(uucplock); |
| 149 | exit(3); |
| 150 | } |
| 151 | setbuf(stdout, NULL); |
| 152 | loginit(); |
| 153 | |
| 154 | /* |
| 155 | * Kludge, their's no easy way to get the initialization |
| 156 | * in the right order, so force it here |
| 157 | */ |
| 158 | if ((PH = getenv("PHONES")) == NOSTR) |
| 159 | PH = _PATH_PHONES; |
| 160 | vinit(); /* init variables */ |
| 161 | setparity("even"); /* set the parity table */ |
| 162 | if ((i = speed(number(value(BAUDRATE)))) == NULL) { |
| 163 | printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); |
| 164 | (void)uu_unlock(uucplock); |
| 165 | exit(3); |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Now that we have the logfile and the ACU open |
| 170 | * return to the real uid and gid. These things will |
| 171 | * be closed on exit. Swap real and effective uid's |
| 172 | * so we can get the original permissions back |
| 173 | * for removing the uucp lock. |
| 174 | */ |
| 175 | user_uid(); |
| 176 | |
| 177 | /* |
| 178 | * Hardwired connections require the |
| 179 | * line speed set before they make any transmissions |
| 180 | * (this is particularly true of things like a DF03-AC) |
| 181 | */ |
| 182 | if (HW) |
| 183 | ttysetup(i); |
| 184 | if (p = connect()) { |
| 185 | printf("\07%s\n[EOT]\n", p); |
| 186 | daemon_uid(); |
| 187 | (void)uu_unlock(uucplock); |
| 188 | exit(1); |
| 189 | } |
| 190 | if (!HW) |
| 191 | ttysetup(i); |
| 192 | cucommon: |
| 193 | /* |
| 194 | * From here down the code is shared with |
| 195 | * the "cu" version of tip. |
| 196 | */ |
| 197 | |
| 198 | ioctl(0, TIOCGETP, (char *)&defarg); |
| 199 | ioctl(0, TIOCGETC, (char *)&defchars); |
| 200 | ioctl(0, TIOCGLTC, (char *)&deflchars); |
| 201 | ioctl(0, TIOCGETD, (char *)&odisc); |
| 202 | arg = defarg; |
| 203 | arg.sg_flags = ANYP | CBREAK; |
| 204 | tchars = defchars; |
| 205 | tchars.t_intrc = tchars.t_quitc = -1; |
| 206 | ltchars = deflchars; |
| 207 | ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc |
| 208 | = ltchars.t_lnextc = -1; |
| 209 | raw(); |
| 210 | |
| 211 | pipe(fildes); pipe(repdes); |
| 212 | (void)signal(SIGALRM, timeout); |
| 213 | |
| 214 | /* |
| 215 | * Everything's set up now: |
| 216 | * connection established (hardwired or dialup) |
| 217 | * line conditioned (baud rate, mode, etc.) |
| 218 | * internal data structures (variables) |
| 219 | * so, fork one process for local side and one for remote. |
| 220 | */ |
| 221 | printf(cumode ? "Connected\r\n" : "\07connected\r\n"); |
| 222 | if (pid = fork()) |
| 223 | tipin(); |
| 224 | else |
| 225 | tipout(); |
| 226 | /*NOTREACHED*/ |
| 227 | } |
| 228 | |
| 229 | void |
| 230 | cleanup() |
| 231 | { |
| 232 | |
| 233 | daemon_uid(); |
| 234 | (void)uu_unlock(uucplock); |
| 235 | if (odisc) |
| 236 | ioctl(0, TIOCSETD, (char *)&odisc); |
| 237 | exit(0); |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Muck with user ID's. We are setuid to the owner of the lock |
| 242 | * directory when we start. user_uid() reverses real and effective |
| 243 | * ID's after startup, to run with the user's permissions. |
| 244 | * daemon_uid() switches back to the privileged uid for unlocking. |
| 245 | * Finally, to avoid running a shell with the wrong real uid, |
| 246 | * shell_uid() sets real and effective uid's to the user's real ID. |
| 247 | */ |
| 248 | static int uidswapped; |
| 249 | |
| 250 | user_uid() |
| 251 | { |
| 252 | if (uidswapped == 0) { |
| 253 | setregid(egid, gid); |
| 254 | setreuid(euid, uid); |
| 255 | uidswapped = 1; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | daemon_uid() |
| 260 | { |
| 261 | |
| 262 | if (uidswapped) { |
| 263 | setreuid(uid, euid); |
| 264 | setregid(gid, egid); |
| 265 | uidswapped = 0; |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | shell_uid() |
| 270 | { |
| 271 | |
| 272 | setreuid(uid, uid); |
| 273 | setregid(gid, gid); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * put the controlling keyboard into raw mode |
| 278 | */ |
| 279 | raw() |
| 280 | { |
| 281 | |
| 282 | ioctl(0, TIOCSETP, &arg); |
| 283 | ioctl(0, TIOCSETC, &tchars); |
| 284 | ioctl(0, TIOCSLTC, <chars); |
| 285 | ioctl(0, TIOCSETD, (char *)&disc); |
| 286 | } |
| 287 | |
| 288 | |
| 289 | /* |
| 290 | * return keyboard to normal mode |
| 291 | */ |
| 292 | unraw() |
| 293 | { |
| 294 | |
| 295 | ioctl(0, TIOCSETD, (char *)&odisc); |
| 296 | ioctl(0, TIOCSETP, (char *)&defarg); |
| 297 | ioctl(0, TIOCSETC, (char *)&defchars); |
| 298 | ioctl(0, TIOCSLTC, (char *)&deflchars); |
| 299 | } |
| 300 | |
| 301 | static jmp_buf promptbuf; |
| 302 | |
| 303 | /* |
| 304 | * Print string ``s'', then read a string |
| 305 | * in from the terminal. Handles signals & allows use of |
| 306 | * normal erase and kill characters. |
| 307 | */ |
| 308 | prompt(s, p) |
| 309 | char *s; |
| 310 | register char *p; |
| 311 | { |
| 312 | register char *b = p; |
| 313 | sig_t oint, oquit; |
| 314 | |
| 315 | stoprompt = 0; |
| 316 | oint = signal(SIGINT, intprompt); |
| 317 | oquit = signal(SIGQUIT, SIG_IGN); |
| 318 | unraw(); |
| 319 | printf("%s", s); |
| 320 | if (setjmp(promptbuf) == 0) |
| 321 | while ((*p = getchar()) != EOF && *p != '\n') |
| 322 | p++; |
| 323 | *p = '\0'; |
| 324 | |
| 325 | raw(); |
| 326 | (void)signal(SIGINT, oint); |
| 327 | (void)signal(SIGQUIT, oquit); |
| 328 | return (stoprompt || p == b); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Interrupt service routine during prompting |
| 333 | */ |
| 334 | void |
| 335 | intprompt() |
| 336 | { |
| 337 | |
| 338 | (void)signal(SIGINT, SIG_IGN); |
| 339 | stoprompt = 1; |
| 340 | printf("\r\n"); |
| 341 | longjmp(promptbuf, 1); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * ****TIPIN TIPIN**** |
| 346 | */ |
| 347 | tipin() |
| 348 | { |
| 349 | char gch, bol = 1; |
| 350 | |
| 351 | /* |
| 352 | * Kinda klugey here... |
| 353 | * check for scripting being turned on from the .tiprc file, |
| 354 | * but be careful about just using setscript(), as we may |
| 355 | * send a SIGEMT before tipout has a chance to set up catching |
| 356 | * it; so wait a second, then setscript() |
| 357 | */ |
| 358 | if (boolean(value(SCRIPT))) { |
| 359 | sleep(1); |
| 360 | setscript(); |
| 361 | } |
| 362 | |
| 363 | while (1) { |
| 364 | gch = getchar()&0177; |
| 365 | if ((gch == character(value(ESCAPE))) && bol) { |
| 366 | if (!(gch = escape())) |
| 367 | continue; |
| 368 | } else if (!cumode && gch == character(value(RAISECHAR))) { |
| 369 | boolean(value(RAISE)) = !boolean(value(RAISE)); |
| 370 | continue; |
| 371 | } else if (gch == '\r') { |
| 372 | bol = 1; |
| 373 | pwrite(FD, &gch, 1); |
| 374 | if (boolean(value(HALFDUPLEX))) |
| 375 | printf("\r\n"); |
| 376 | continue; |
| 377 | } else if (!cumode && gch == character(value(FORCE))) |
| 378 | gch = getchar()&0177; |
| 379 | bol = any(gch, value(EOL)); |
| 380 | if (boolean(value(RAISE)) && islower(gch)) |
| 381 | gch = toupper(gch); |
| 382 | pwrite(FD, &gch, 1); |
| 383 | if (boolean(value(HALFDUPLEX))) |
| 384 | printf("%c", gch); |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | * Escape handler -- |
| 390 | * called on recognition of ``escapec'' at the beginning of a line |
| 391 | */ |
| 392 | escape() |
| 393 | { |
| 394 | register char gch; |
| 395 | register esctable_t *p; |
| 396 | char c = character(value(ESCAPE)); |
| 397 | extern esctable_t etable[]; |
| 398 | |
| 399 | gch = (getchar()&0177); |
| 400 | for (p = etable; p->e_char; p++) |
| 401 | if (p->e_char == gch) { |
| 402 | if ((p->e_flags&PRIV) && uid) |
| 403 | continue; |
| 404 | printf("%s", ctrl(c)); |
| 405 | (*p->e_func)(gch); |
| 406 | return (0); |
| 407 | } |
| 408 | /* ESCAPE ESCAPE forces ESCAPE */ |
| 409 | if (c != gch) |
| 410 | pwrite(FD, &c, 1); |
| 411 | return (gch); |
| 412 | } |
| 413 | |
| 414 | speed(n) |
| 415 | int n; |
| 416 | { |
| 417 | register int *p; |
| 418 | |
| 419 | for (p = bauds; *p != -1; p++) |
| 420 | if (*p == n) |
| 421 | return (p - bauds); |
| 422 | return (NULL); |
| 423 | } |
| 424 | |
| 425 | any(c, p) |
| 426 | register char c, *p; |
| 427 | { |
| 428 | while (p && *p) |
| 429 | if (*p++ == c) |
| 430 | return (1); |
| 431 | return (0); |
| 432 | } |
| 433 | |
| 434 | size(s) |
| 435 | register char *s; |
| 436 | { |
| 437 | register int i = 0; |
| 438 | |
| 439 | while (s && *s++) |
| 440 | i++; |
| 441 | return (i); |
| 442 | } |
| 443 | |
| 444 | char * |
| 445 | interp(s) |
| 446 | register char *s; |
| 447 | { |
| 448 | static char buf[256]; |
| 449 | register char *p = buf, c, *q; |
| 450 | |
| 451 | while (c = *s++) { |
| 452 | for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) |
| 453 | if (*q++ == c) { |
| 454 | *p++ = '\\'; *p++ = *q; |
| 455 | goto next; |
| 456 | } |
| 457 | if (c < 040) { |
| 458 | *p++ = '^'; *p++ = c + 'A'-1; |
| 459 | } else if (c == 0177) { |
| 460 | *p++ = '^'; *p++ = '?'; |
| 461 | } else |
| 462 | *p++ = c; |
| 463 | next: |
| 464 | ; |
| 465 | } |
| 466 | *p = '\0'; |
| 467 | return (buf); |
| 468 | } |
| 469 | |
| 470 | char * |
| 471 | ctrl(c) |
| 472 | char c; |
| 473 | { |
| 474 | static char s[3]; |
| 475 | |
| 476 | if (c < 040 || c == 0177) { |
| 477 | s[0] = '^'; |
| 478 | s[1] = c == 0177 ? '?' : c+'A'-1; |
| 479 | s[2] = '\0'; |
| 480 | } else { |
| 481 | s[0] = c; |
| 482 | s[1] = '\0'; |
| 483 | } |
| 484 | return (s); |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * Help command |
| 489 | */ |
| 490 | help(c) |
| 491 | char c; |
| 492 | { |
| 493 | register esctable_t *p; |
| 494 | extern esctable_t etable[]; |
| 495 | |
| 496 | printf("%c\r\n", c); |
| 497 | for (p = etable; p->e_char; p++) { |
| 498 | if ((p->e_flags&PRIV) && uid) |
| 499 | continue; |
| 500 | printf("%2s", ctrl(character(value(ESCAPE)))); |
| 501 | printf("%-2s %c %s\r\n", ctrl(p->e_char), |
| 502 | p->e_flags&EXP ? '*': ' ', p->e_help); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | /* |
| 507 | * Set up the "remote" tty's state |
| 508 | */ |
| 509 | ttysetup(speed) |
| 510 | int speed; |
| 511 | { |
| 512 | unsigned bits = LDECCTQ; |
| 513 | |
| 514 | arg.sg_ispeed = arg.sg_ospeed = speed; |
| 515 | arg.sg_flags = RAW; |
| 516 | if (boolean(value(TAND))) |
| 517 | arg.sg_flags |= TANDEM; |
| 518 | ioctl(FD, TIOCSETP, (char *)&arg); |
| 519 | ioctl(FD, TIOCLBIS, (char *)&bits); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Return "simple" name from a file name, |
| 524 | * strip leading directories. |
| 525 | */ |
| 526 | char * |
| 527 | sname(s) |
| 528 | register char *s; |
| 529 | { |
| 530 | register char *p = s; |
| 531 | |
| 532 | while (*s) |
| 533 | if (*s++ == '/') |
| 534 | p = s; |
| 535 | return (p); |
| 536 | } |
| 537 | |
| 538 | static char partab[0200]; |
| 539 | static int bits8; |
| 540 | |
| 541 | /* |
| 542 | * Do a write to the remote machine with the correct parity. |
| 543 | * We are doing 8 bit wide output, so we just generate a character |
| 544 | * with the right parity and output it. |
| 545 | */ |
| 546 | pwrite(fd, buf, n) |
| 547 | int fd; |
| 548 | char *buf; |
| 549 | register int n; |
| 550 | { |
| 551 | register int i; |
| 552 | register char *bp; |
| 553 | extern int errno; |
| 554 | |
| 555 | bp = buf; |
| 556 | if (bits8 == 0) { |
| 557 | static char *mbp; static sz; |
| 558 | |
| 559 | if (mbp == 0 || n > sz) { |
| 560 | if (mbp) |
| 561 | free(mbp); |
| 562 | mbp = (char *) malloc(n); |
| 563 | sz = n; |
| 564 | } |
| 565 | |
| 566 | bp = mbp; |
| 567 | for (i = 0; i < n; i++) |
| 568 | *bp++ = partab[*buf++ & 0177]; |
| 569 | bp = mbp; |
| 570 | } |
| 571 | if (write(fd, bp, n) < 0) { |
| 572 | if (errno == EIO) |
| 573 | tipabort("Lost carrier."); |
| 574 | /* this is questionable */ |
| 575 | perror("write"); |
| 576 | } |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Build a parity table with appropriate high-order bit. |
| 581 | */ |
| 582 | setparity(defparity) |
| 583 | char *defparity; |
| 584 | { |
| 585 | register int i, flip, clr, set; |
| 586 | char *parity; |
| 587 | extern char evenpartab[]; |
| 588 | |
| 589 | if (value(PARITY) == NOSTR) |
| 590 | value(PARITY) = defparity; |
| 591 | parity = value(PARITY); |
| 592 | if (equal(parity, "none")) { |
| 593 | bits8 = 1; |
| 594 | return; |
| 595 | } |
| 596 | bits8 = 0; |
| 597 | flip = 0; |
| 598 | clr = 0377; |
| 599 | set = 0; |
| 600 | if (equal(parity, "odd")) |
| 601 | flip = 0200; /* reverse bit 7 */ |
| 602 | else if (equal(parity, "zero")) |
| 603 | clr = 0177; /* turn off bit 7 */ |
| 604 | else if (equal(parity, "one")) |
| 605 | set = 0200; /* turn on bit 7 */ |
| 606 | else if (!equal(parity, "even")) { |
| 607 | (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); |
| 608 | (void) fflush(stderr); |
| 609 | } |
| 610 | for (i = 0; i < 0200; i++) |
| 611 | partab[i] = evenpartab[i] ^ flip | set & clr; |
| 612 | } |