1 /* 2 * Copyright (c) 1983 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char copyright[] = 10 "@(#) Copyright (c) 1983 The Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)tip.c 5.18 (Berkeley) 05/27/93"; 16 #endif /* not lint */ 17 18 /* 19 * tip - UNIX link to other systems 20 * tip [-v] [-speed] system-name 21 * or 22 * cu phone-number [-s speed] [-l line] [-a acu] 23 */ 24 #include "tip.h" 25 #include "pathnames.h" 26 27 /* 28 * Baud rate mapping table 29 */ 30 int bauds[] = { 31 0, 50, 75, 110, 134, 150, 200, 300, 600, 32 1200, 1800, 2400, 4800, 9600, 19200, -1 33 }; 34 35 int disc = OTTYDISC; /* tip normally runs this way */ 36 void intprompt(); 37 void timeout(); 38 void cleanup(); 39 char *sname(); 40 char PNbuf[256]; /* This limits the size of a number */ 41 42 main(argc, argv) 43 char *argv[]; 44 { 45 char *system = NOSTR; 46 register int i; 47 register char *p; 48 char sbuf[12]; 49 50 gid = getgid(); 51 egid = getegid(); 52 uid = getuid(); 53 euid = geteuid(); 54 if (equal(sname(argv[0]), "cu")) { 55 cumode = 1; 56 cumain(argc, argv); 57 goto cucommon; 58 } 59 60 if (argc > 4) { 61 fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n"); 62 exit(1); 63 } 64 if (!isatty(0)) { 65 fprintf(stderr, "tip: must be interactive\n"); 66 exit(1); 67 } 68 69 for (; argc > 1; argv++, argc--) { 70 if (argv[1][0] != '-') 71 system = argv[1]; 72 else switch (argv[1][1]) { 73 74 case 'v': 75 vflag++; 76 break; 77 78 case '0': case '1': case '2': case '3': case '4': 79 case '5': case '6': case '7': case '8': case '9': 80 BR = atoi(&argv[1][1]); 81 break; 82 83 default: 84 fprintf(stderr, "tip: %s, unknown option\n", argv[1]); 85 break; 86 } 87 } 88 89 if (system == NOSTR) 90 goto notnumber; 91 if (isalpha(*system)) 92 goto notnumber; 93 /* 94 * System name is really a phone number... 95 * Copy the number then stomp on the original (in case the number 96 * is private, we don't want 'ps' or 'w' to find it). 97 */ 98 if (strlen(system) > sizeof PNbuf - 1) { 99 fprintf(stderr, "tip: phone number too long (max = %d bytes)\n", 100 sizeof PNbuf - 1); 101 exit(1); 102 } 103 strncpy( PNbuf, system, sizeof PNbuf - 1 ); 104 for (p = system; *p; p++) 105 *p = '\0'; 106 PN = PNbuf; 107 (void)sprintf(sbuf, "tip%d", BR); 108 system = sbuf; 109 110 notnumber: 111 (void)signal(SIGINT, cleanup); 112 (void)signal(SIGQUIT, cleanup); 113 (void)signal(SIGHUP, cleanup); 114 (void)signal(SIGTERM, cleanup); 115 116 if ((i = hunt(system)) == 0) { 117 printf("all ports busy\n"); 118 exit(3); 119 } 120 if (i == -1) { 121 printf("link down\n"); 122 (void)uu_unlock(uucplock); 123 exit(3); 124 } 125 setbuf(stdout, NULL); 126 loginit(); 127 128 /* 129 * Kludge, their's no easy way to get the initialization 130 * in the right order, so force it here 131 */ 132 if ((PH = getenv("PHONES")) == NOSTR) 133 PH = _PATH_PHONES; 134 vinit(); /* init variables */ 135 setparity("even"); /* set the parity table */ 136 if ((i = speed(number(value(BAUDRATE)))) == NULL) { 137 printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); 138 (void)uu_unlock(uucplock); 139 exit(3); 140 } 141 142 /* 143 * Now that we have the logfile and the ACU open 144 * return to the real uid and gid. These things will 145 * be closed on exit. Swap real and effective uid's 146 * so we can get the original permissions back 147 * for removing the uucp lock. 148 */ 149 user_uid(); 150 151 /* 152 * Hardwired connections require the 153 * line speed set before they make any transmissions 154 * (this is particularly true of things like a DF03-AC) 155 */ 156 if (HW) 157 ttysetup(i); 158 if (p = connect()) { 159 printf("\07%s\n[EOT]\n", p); 160 daemon_uid(); 161 (void)uu_unlock(uucplock); 162 exit(1); 163 } 164 if (!HW) 165 ttysetup(i); 166 cucommon: 167 /* 168 * From here down the code is shared with 169 * the "cu" version of tip. 170 */ 171 172 ioctl(0, TIOCGETP, (char *)&defarg); 173 ioctl(0, TIOCGETC, (char *)&defchars); 174 ioctl(0, TIOCGLTC, (char *)&deflchars); 175 ioctl(0, TIOCGETD, (char *)&odisc); 176 arg = defarg; 177 arg.sg_flags = ANYP | CBREAK; 178 tchars = defchars; 179 tchars.t_intrc = tchars.t_quitc = -1; 180 ltchars = deflchars; 181 ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc 182 = ltchars.t_lnextc = -1; 183 raw(); 184 185 pipe(fildes); pipe(repdes); 186 (void)signal(SIGALRM, timeout); 187 188 /* 189 * Everything's set up now: 190 * connection established (hardwired or dialup) 191 * line conditioned (baud rate, mode, etc.) 192 * internal data structures (variables) 193 * so, fork one process for local side and one for remote. 194 */ 195 printf(cumode ? "Connected\r\n" : "\07connected\r\n"); 196 if (pid = fork()) 197 tipin(); 198 else 199 tipout(); 200 /*NOTREACHED*/ 201 } 202 203 void 204 cleanup() 205 { 206 207 daemon_uid(); 208 (void)uu_unlock(uucplock); 209 if (odisc) 210 ioctl(0, TIOCSETD, (char *)&odisc); 211 exit(0); 212 } 213 214 /* 215 * Muck with user ID's. We are setuid to the owner of the lock 216 * directory when we start. user_uid() reverses real and effective 217 * ID's after startup, to run with the user's permissions. 218 * daemon_uid() switches back to the privileged uid for unlocking. 219 * Finally, to avoid running a shell with the wrong real uid, 220 * shell_uid() sets real and effective uid's to the user's real ID. 221 */ 222 static int uidswapped; 223 224 user_uid() 225 { 226 if (uidswapped == 0) { 227 seteuid(uid); 228 uidswapped = 1; 229 } 230 } 231 232 daemon_uid() 233 { 234 235 if (uidswapped) { 236 seteuid(euid); 237 uidswapped = 0; 238 } 239 } 240 241 shell_uid() 242 { 243 244 seteuid(uid); 245 } 246 247 /* 248 * put the controlling keyboard into raw mode 249 */ 250 raw() 251 { 252 253 ioctl(0, TIOCSETP, &arg); 254 ioctl(0, TIOCSETC, &tchars); 255 ioctl(0, TIOCSLTC, <chars); 256 ioctl(0, TIOCSETD, (char *)&disc); 257 } 258 259 260 /* 261 * return keyboard to normal mode 262 */ 263 unraw() 264 { 265 266 ioctl(0, TIOCSETD, (char *)&odisc); 267 ioctl(0, TIOCSETP, (char *)&defarg); 268 ioctl(0, TIOCSETC, (char *)&defchars); 269 ioctl(0, TIOCSLTC, (char *)&deflchars); 270 } 271 272 static jmp_buf promptbuf; 273 274 /* 275 * Print string ``s'', then read a string 276 * in from the terminal. Handles signals & allows use of 277 * normal erase and kill characters. 278 */ 279 prompt(s, p) 280 char *s; 281 register char *p; 282 { 283 register char *b = p; 284 sig_t oint, oquit; 285 286 stoprompt = 0; 287 oint = signal(SIGINT, intprompt); 288 oquit = signal(SIGQUIT, SIG_IGN); 289 unraw(); 290 printf("%s", s); 291 if (setjmp(promptbuf) == 0) 292 while ((*p = getchar()) != EOF && *p != '\n') 293 p++; 294 *p = '\0'; 295 296 raw(); 297 (void)signal(SIGINT, oint); 298 (void)signal(SIGQUIT, oquit); 299 return (stoprompt || p == b); 300 } 301 302 /* 303 * Interrupt service routine during prompting 304 */ 305 void 306 intprompt() 307 { 308 309 (void)signal(SIGINT, SIG_IGN); 310 stoprompt = 1; 311 printf("\r\n"); 312 longjmp(promptbuf, 1); 313 } 314 315 /* 316 * ****TIPIN TIPIN**** 317 */ 318 tipin() 319 { 320 char gch, bol = 1; 321 322 /* 323 * Kinda klugey here... 324 * check for scripting being turned on from the .tiprc file, 325 * but be careful about just using setscript(), as we may 326 * send a SIGEMT before tipout has a chance to set up catching 327 * it; so wait a second, then setscript() 328 */ 329 if (boolean(value(SCRIPT))) { 330 sleep(1); 331 setscript(); 332 } 333 334 while (1) { 335 gch = getchar()&0177; 336 if ((gch == character(value(ESCAPE))) && bol) { 337 if (!(gch = escape())) 338 continue; 339 } else if (!cumode && gch == character(value(RAISECHAR))) { 340 boolean(value(RAISE)) = !boolean(value(RAISE)); 341 continue; 342 } else if (gch == '\r') { 343 bol = 1; 344 pwrite(FD, &gch, 1); 345 if (boolean(value(HALFDUPLEX))) 346 printf("\r\n"); 347 continue; 348 } else if (!cumode && gch == character(value(FORCE))) 349 gch = getchar()&0177; 350 bol = any(gch, value(EOL)); 351 if (boolean(value(RAISE)) && islower(gch)) 352 gch = toupper(gch); 353 pwrite(FD, &gch, 1); 354 if (boolean(value(HALFDUPLEX))) 355 printf("%c", gch); 356 } 357 } 358 359 extern esctable_t etable[]; 360 361 /* 362 * Escape handler -- 363 * called on recognition of ``escapec'' at the beginning of a line 364 */ 365 escape() 366 { 367 register char gch; 368 register esctable_t *p; 369 char c = character(value(ESCAPE)); 370 371 gch = (getchar()&0177); 372 for (p = etable; p->e_char; p++) 373 if (p->e_char == gch) { 374 if ((p->e_flags&PRIV) && uid) 375 continue; 376 printf("%s", ctrl(c)); 377 (*p->e_func)(gch); 378 return (0); 379 } 380 /* ESCAPE ESCAPE forces ESCAPE */ 381 if (c != gch) 382 pwrite(FD, &c, 1); 383 return (gch); 384 } 385 386 speed(n) 387 int n; 388 { 389 register int *p; 390 391 for (p = bauds; *p != -1; p++) 392 if (*p == n) 393 return (p - bauds); 394 return (NULL); 395 } 396 397 any(c, p) 398 register char c, *p; 399 { 400 while (p && *p) 401 if (*p++ == c) 402 return (1); 403 return (0); 404 } 405 406 size(s) 407 register char *s; 408 { 409 register int i = 0; 410 411 while (s && *s++) 412 i++; 413 return (i); 414 } 415 416 char * 417 interp(s) 418 register char *s; 419 { 420 static char buf[256]; 421 register char *p = buf, c, *q; 422 423 while (c = *s++) { 424 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 425 if (*q++ == c) { 426 *p++ = '\\'; *p++ = *q; 427 goto next; 428 } 429 if (c < 040) { 430 *p++ = '^'; *p++ = c + 'A'-1; 431 } else if (c == 0177) { 432 *p++ = '^'; *p++ = '?'; 433 } else 434 *p++ = c; 435 next: 436 ; 437 } 438 *p = '\0'; 439 return (buf); 440 } 441 442 char * 443 ctrl(c) 444 char c; 445 { 446 static char s[3]; 447 448 if (c < 040 || c == 0177) { 449 s[0] = '^'; 450 s[1] = c == 0177 ? '?' : c+'A'-1; 451 s[2] = '\0'; 452 } else { 453 s[0] = c; 454 s[1] = '\0'; 455 } 456 return (s); 457 } 458 459 /* 460 * Help command 461 */ 462 help(c) 463 char c; 464 { 465 register esctable_t *p; 466 467 printf("%c\r\n", c); 468 for (p = etable; p->e_char; p++) { 469 if ((p->e_flags&PRIV) && uid) 470 continue; 471 printf("%2s", ctrl(character(value(ESCAPE)))); 472 printf("%-2s %c %s\r\n", ctrl(p->e_char), 473 p->e_flags&EXP ? '*': ' ', p->e_help); 474 } 475 } 476 477 /* 478 * Set up the "remote" tty's state 479 */ 480 ttysetup(speed) 481 int speed; 482 { 483 unsigned bits = LDECCTQ; 484 485 arg.sg_ispeed = arg.sg_ospeed = speed; 486 arg.sg_flags = RAW; 487 if (boolean(value(TAND))) 488 arg.sg_flags |= TANDEM; 489 ioctl(FD, TIOCSETP, (char *)&arg); 490 ioctl(FD, TIOCLBIS, (char *)&bits); 491 } 492 493 /* 494 * Return "simple" name from a file name, 495 * strip leading directories. 496 */ 497 char * 498 sname(s) 499 register char *s; 500 { 501 register char *p = s; 502 503 while (*s) 504 if (*s++ == '/') 505 p = s; 506 return (p); 507 } 508 509 static char partab[0200]; 510 static int bits8; 511 512 /* 513 * Do a write to the remote machine with the correct parity. 514 * We are doing 8 bit wide output, so we just generate a character 515 * with the right parity and output it. 516 */ 517 pwrite(fd, buf, n) 518 int fd; 519 char *buf; 520 register int n; 521 { 522 register int i; 523 register char *bp; 524 extern int errno; 525 526 bp = buf; 527 if (bits8 == 0) 528 for (i = 0; i < n; i++) { 529 *bp = partab[(*bp) & 0177]; 530 bp++; 531 } 532 if (write(fd, buf, n) < 0) { 533 if (errno == EIO) 534 tipabort("Lost carrier."); 535 /* this is questionable */ 536 perror("write"); 537 } 538 } 539 540 /* 541 * Build a parity table with appropriate high-order bit. 542 */ 543 setparity(defparity) 544 char *defparity; 545 { 546 register int i, flip, clr, set; 547 char *parity; 548 extern char evenpartab[]; 549 550 if (value(PARITY) == NOSTR) 551 value(PARITY) = defparity; 552 parity = value(PARITY); 553 if (equal(parity, "none")) { 554 bits8 = 1; 555 return; 556 } 557 bits8 = 0; 558 flip = 0; 559 clr = 0377; 560 set = 0; 561 if (equal(parity, "odd")) 562 flip = 0200; /* reverse bit 7 */ 563 else if (equal(parity, "zero")) 564 clr = 0177; /* turn off bit 7 */ 565 else if (equal(parity, "one")) 566 set = 0200; /* turn on bit 7 */ 567 else if (!equal(parity, "even")) { 568 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 569 (void) fflush(stderr); 570 } 571 for (i = 0; i < 0200; i++) 572 partab[i] = evenpartab[i] ^ flip | set & clr; 573 } 574