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 } 613