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 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 5.15 (Berkeley) 02/04/91"; 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 setregid(egid, gid); 228 setreuid(euid, uid); 229 uidswapped = 1; 230 } 231 } 232 233 daemon_uid() 234 { 235 236 if (uidswapped) { 237 setreuid(uid, euid); 238 setregid(gid, egid); 239 uidswapped = 0; 240 } 241 } 242 243 shell_uid() 244 { 245 246 setreuid(uid, uid); 247 setregid(gid, gid); 248 } 249 250 /* 251 * put the controlling keyboard into raw mode 252 */ 253 raw() 254 { 255 256 ioctl(0, TIOCSETP, &arg); 257 ioctl(0, TIOCSETC, &tchars); 258 ioctl(0, TIOCSLTC, <chars); 259 ioctl(0, TIOCSETD, (char *)&disc); 260 } 261 262 263 /* 264 * return keyboard to normal mode 265 */ 266 unraw() 267 { 268 269 ioctl(0, TIOCSETD, (char *)&odisc); 270 ioctl(0, TIOCSETP, (char *)&defarg); 271 ioctl(0, TIOCSETC, (char *)&defchars); 272 ioctl(0, TIOCSLTC, (char *)&deflchars); 273 } 274 275 static jmp_buf promptbuf; 276 277 /* 278 * Print string ``s'', then read a string 279 * in from the terminal. Handles signals & allows use of 280 * normal erase and kill characters. 281 */ 282 prompt(s, p) 283 char *s; 284 register char *p; 285 { 286 register char *b = p; 287 sig_t oint, oquit; 288 289 stoprompt = 0; 290 oint = signal(SIGINT, intprompt); 291 oquit = signal(SIGQUIT, SIG_IGN); 292 unraw(); 293 printf("%s", s); 294 if (setjmp(promptbuf) == 0) 295 while ((*p = getchar()) != EOF && *p != '\n') 296 p++; 297 *p = '\0'; 298 299 raw(); 300 (void)signal(SIGINT, oint); 301 (void)signal(SIGQUIT, oquit); 302 return (stoprompt || p == b); 303 } 304 305 /* 306 * Interrupt service routine during prompting 307 */ 308 void 309 intprompt() 310 { 311 312 (void)signal(SIGINT, SIG_IGN); 313 stoprompt = 1; 314 printf("\r\n"); 315 longjmp(promptbuf, 1); 316 } 317 318 /* 319 * ****TIPIN TIPIN**** 320 */ 321 tipin() 322 { 323 char gch, bol = 1; 324 325 /* 326 * Kinda klugey here... 327 * check for scripting being turned on from the .tiprc file, 328 * but be careful about just using setscript(), as we may 329 * send a SIGEMT before tipout has a chance to set up catching 330 * it; so wait a second, then setscript() 331 */ 332 if (boolean(value(SCRIPT))) { 333 sleep(1); 334 setscript(); 335 } 336 337 while (1) { 338 gch = getchar()&0177; 339 if ((gch == character(value(ESCAPE))) && bol) { 340 if (!(gch = escape())) 341 continue; 342 } else if (!cumode && gch == character(value(RAISECHAR))) { 343 boolean(value(RAISE)) = !boolean(value(RAISE)); 344 continue; 345 } else if (gch == '\r') { 346 bol = 1; 347 pwrite(FD, &gch, 1); 348 if (boolean(value(HALFDUPLEX))) 349 printf("\r\n"); 350 continue; 351 } else if (!cumode && gch == character(value(FORCE))) 352 gch = getchar()&0177; 353 bol = any(gch, value(EOL)); 354 if (boolean(value(RAISE)) && islower(gch)) 355 gch = toupper(gch); 356 pwrite(FD, &gch, 1); 357 if (boolean(value(HALFDUPLEX))) 358 printf("%c", gch); 359 } 360 } 361 362 /* 363 * Escape handler -- 364 * called on recognition of ``escapec'' at the beginning of a line 365 */ 366 escape() 367 { 368 register char gch; 369 register esctable_t *p; 370 char c = character(value(ESCAPE)); 371 extern esctable_t etable[]; 372 373 gch = (getchar()&0177); 374 for (p = etable; p->e_char; p++) 375 if (p->e_char == gch) { 376 if ((p->e_flags&PRIV) && uid) 377 continue; 378 printf("%s", ctrl(c)); 379 (*p->e_func)(gch); 380 return (0); 381 } 382 /* ESCAPE ESCAPE forces ESCAPE */ 383 if (c != gch) 384 pwrite(FD, &c, 1); 385 return (gch); 386 } 387 388 speed(n) 389 int n; 390 { 391 register int *p; 392 393 for (p = bauds; *p != -1; p++) 394 if (*p == n) 395 return (p - bauds); 396 return (NULL); 397 } 398 399 any(c, p) 400 register char c, *p; 401 { 402 while (p && *p) 403 if (*p++ == c) 404 return (1); 405 return (0); 406 } 407 408 size(s) 409 register char *s; 410 { 411 register int i = 0; 412 413 while (s && *s++) 414 i++; 415 return (i); 416 } 417 418 char * 419 interp(s) 420 register char *s; 421 { 422 static char buf[256]; 423 register char *p = buf, c, *q; 424 425 while (c = *s++) { 426 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 427 if (*q++ == c) { 428 *p++ = '\\'; *p++ = *q; 429 goto next; 430 } 431 if (c < 040) { 432 *p++ = '^'; *p++ = c + 'A'-1; 433 } else if (c == 0177) { 434 *p++ = '^'; *p++ = '?'; 435 } else 436 *p++ = c; 437 next: 438 ; 439 } 440 *p = '\0'; 441 return (buf); 442 } 443 444 char * 445 ctrl(c) 446 char c; 447 { 448 static char s[3]; 449 450 if (c < 040 || c == 0177) { 451 s[0] = '^'; 452 s[1] = c == 0177 ? '?' : c+'A'-1; 453 s[2] = '\0'; 454 } else { 455 s[0] = c; 456 s[1] = '\0'; 457 } 458 return (s); 459 } 460 461 /* 462 * Help command 463 */ 464 help(c) 465 char c; 466 { 467 register esctable_t *p; 468 extern esctable_t etable[]; 469 470 printf("%c\r\n", c); 471 for (p = etable; p->e_char; p++) { 472 if ((p->e_flags&PRIV) && uid) 473 continue; 474 printf("%2s", ctrl(character(value(ESCAPE)))); 475 printf("%-2s %c %s\r\n", ctrl(p->e_char), 476 p->e_flags&EXP ? '*': ' ', p->e_help); 477 } 478 } 479 480 /* 481 * Set up the "remote" tty's state 482 */ 483 ttysetup(speed) 484 int speed; 485 { 486 unsigned bits = LDECCTQ; 487 488 arg.sg_ispeed = arg.sg_ospeed = speed; 489 arg.sg_flags = RAW; 490 if (boolean(value(TAND))) 491 arg.sg_flags |= TANDEM; 492 ioctl(FD, TIOCSETP, (char *)&arg); 493 ioctl(FD, TIOCLBIS, (char *)&bits); 494 } 495 496 /* 497 * Return "simple" name from a file name, 498 * strip leading directories. 499 */ 500 char * 501 sname(s) 502 register char *s; 503 { 504 register char *p = s; 505 506 while (*s) 507 if (*s++ == '/') 508 p = s; 509 return (p); 510 } 511 512 static char partab[0200]; 513 static int bits8; 514 515 /* 516 * Do a write to the remote machine with the correct parity. 517 * We are doing 8 bit wide output, so we just generate a character 518 * with the right parity and output it. 519 */ 520 pwrite(fd, buf, n) 521 int fd; 522 char *buf; 523 register int n; 524 { 525 register int i; 526 register char *bp; 527 extern int errno; 528 529 bp = buf; 530 if (bits8 == 0) 531 for (i = 0; i < n; i++) { 532 *bp = partab[(*bp) & 0177]; 533 bp++; 534 } 535 if (write(fd, buf, n) < 0) { 536 if (errno == EIO) 537 tipabort("Lost carrier."); 538 /* this is questionable */ 539 perror("write"); 540 } 541 } 542 543 /* 544 * Build a parity table with appropriate high-order bit. 545 */ 546 setparity(defparity) 547 char *defparity; 548 { 549 register int i, flip, clr, set; 550 char *parity; 551 extern char evenpartab[]; 552 553 if (value(PARITY) == NOSTR) 554 value(PARITY) = defparity; 555 parity = value(PARITY); 556 if (equal(parity, "none")) { 557 bits8 = 1; 558 return; 559 } 560 bits8 = 0; 561 flip = 0; 562 clr = 0377; 563 set = 0; 564 if (equal(parity, "odd")) 565 flip = 0200; /* reverse bit 7 */ 566 else if (equal(parity, "zero")) 567 clr = 0177; /* turn off bit 7 */ 568 else if (equal(parity, "one")) 569 set = 0200; /* turn on bit 7 */ 570 else if (!equal(parity, "even")) { 571 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 572 (void) fflush(stderr); 573 } 574 for (i = 0; i < 0200; i++) 575 partab[i] = evenpartab[i] ^ flip | set & clr; 576 } 577