tip.c revision 1.3
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, 115200, -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 * Now that we have the logfile and the ACU open 156 * return to the real uid and gid. These things will 157 * be closed on exit. Swap real and effective uid's 158 * so we can get the original permissions back 159 * for removing the uucp lock. 160 */ 161 user_uid(); 162 163 /* 164 * Kludge, their's no easy way to get the initialization 165 * in the right order, so force it here 166 */ 167 if ((PH = getenv("PHONES")) == NOSTR) 168 PH = _PATH_PHONES; 169 vinit(); /* init variables */ 170 setparity("even"); /* set the parity table */ 171 if ((i = speed(number(value(BAUDRATE)))) == NULL) { 172 printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); 173 daemon_uid(); 174 (void)uu_unlock(uucplock); 175 exit(3); 176 } 177 178 /* 179 * Hardwired connections require the 180 * line speed set before they make any transmissions 181 * (this is particularly true of things like a DF03-AC) 182 */ 183 if (HW) 184 ttysetup(i); 185 if (p = connect()) { 186 printf("\07%s\n[EOT]\n", p); 187 daemon_uid(); 188 (void)uu_unlock(uucplock); 189 exit(1); 190 } 191 if (!HW) 192 ttysetup(i); 193 cucommon: 194 /* 195 * From here down the code is shared with 196 * the "cu" version of tip. 197 */ 198 199 ioctl(0, TIOCGETP, (char *)&defarg); 200 ioctl(0, TIOCGETC, (char *)&defchars); 201 ioctl(0, TIOCGLTC, (char *)&deflchars); 202 ioctl(0, TIOCGETD, (char *)&odisc); 203 arg = defarg; 204 arg.sg_flags = ANYP | CBREAK; 205 tchars = defchars; 206 tchars.t_intrc = tchars.t_quitc = -1; 207 ltchars = deflchars; 208 ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc 209 = ltchars.t_lnextc = -1; 210 raw(); 211 212 pipe(fildes); pipe(repdes); 213 (void)signal(SIGALRM, timeout); 214 215 /* 216 * Everything's set up now: 217 * connection established (hardwired or dialup) 218 * line conditioned (baud rate, mode, etc.) 219 * internal data structures (variables) 220 * so, fork one process for local side and one for remote. 221 */ 222 printf(cumode ? "Connected\r\n" : "\07connected\r\n"); 223 if (pid = fork()) 224 tipin(); 225 else 226 tipout(); 227 /*NOTREACHED*/ 228 } 229 230 void 231 cleanup() 232 { 233 234 daemon_uid(); 235 (void)uu_unlock(uucplock); 236 if (odisc) 237 ioctl(0, TIOCSETD, (char *)&odisc); 238 exit(0); 239 } 240 241 /* 242 * Muck with user ID's. We are setuid to the owner of the lock 243 * directory when we start. user_uid() reverses real and effective 244 * ID's after startup, to run with the user's permissions. 245 * daemon_uid() switches back to the privileged uid for unlocking. 246 * Finally, to avoid running a shell with the wrong real uid, 247 * shell_uid() sets real and effective uid's to the user's real ID. 248 */ 249 static int uidswapped; 250 251 user_uid() 252 { 253 if (uidswapped == 0) { 254 setregid(egid, gid); 255 setreuid(euid, uid); 256 uidswapped = 1; 257 } 258 } 259 260 daemon_uid() 261 { 262 263 if (uidswapped) { 264 setreuid(uid, euid); 265 setregid(gid, egid); 266 uidswapped = 0; 267 } 268 } 269 270 shell_uid() 271 { 272 273 setreuid(uid, uid); 274 setregid(gid, gid); 275 } 276 277 /* 278 * put the controlling keyboard into raw mode 279 */ 280 raw() 281 { 282 283 ioctl(0, TIOCSETP, &arg); 284 ioctl(0, TIOCSETC, &tchars); 285 ioctl(0, TIOCSLTC, <chars); 286 ioctl(0, TIOCSETD, (char *)&disc); 287 } 288 289 290 /* 291 * return keyboard to normal mode 292 */ 293 unraw() 294 { 295 296 ioctl(0, TIOCSETD, (char *)&odisc); 297 ioctl(0, TIOCSETP, (char *)&defarg); 298 ioctl(0, TIOCSETC, (char *)&defchars); 299 ioctl(0, TIOCSLTC, (char *)&deflchars); 300 } 301 302 static jmp_buf promptbuf; 303 304 /* 305 * Print string ``s'', then read a string 306 * in from the terminal. Handles signals & allows use of 307 * normal erase and kill characters. 308 */ 309 prompt(s, p) 310 char *s; 311 register char *p; 312 { 313 register char *b = p; 314 sig_t oint, oquit; 315 316 stoprompt = 0; 317 oint = signal(SIGINT, intprompt); 318 oquit = signal(SIGQUIT, SIG_IGN); 319 unraw(); 320 printf("%s", s); 321 if (setjmp(promptbuf) == 0) 322 while ((*p = getchar()) != EOF && *p != '\n') 323 p++; 324 *p = '\0'; 325 326 raw(); 327 (void)signal(SIGINT, oint); 328 (void)signal(SIGQUIT, oquit); 329 return (stoprompt || p == b); 330 } 331 332 /* 333 * Interrupt service routine during prompting 334 */ 335 void 336 intprompt() 337 { 338 339 (void)signal(SIGINT, SIG_IGN); 340 stoprompt = 1; 341 printf("\r\n"); 342 longjmp(promptbuf, 1); 343 } 344 345 /* 346 * ****TIPIN TIPIN**** 347 */ 348 tipin() 349 { 350 char gch, bol = 1; 351 352 /* 353 * Kinda klugey here... 354 * check for scripting being turned on from the .tiprc file, 355 * but be careful about just using setscript(), as we may 356 * send a SIGEMT before tipout has a chance to set up catching 357 * it; so wait a second, then setscript() 358 */ 359 if (boolean(value(SCRIPT))) { 360 sleep(1); 361 setscript(); 362 } 363 364 while (1) { 365 gch = getchar()&0177; 366 if ((gch == character(value(ESCAPE))) && bol) { 367 if (!(gch = escape())) 368 continue; 369 } else if (!cumode && gch == character(value(RAISECHAR))) { 370 boolean(value(RAISE)) = !boolean(value(RAISE)); 371 continue; 372 } else if (gch == '\r') { 373 bol = 1; 374 pwrite(FD, &gch, 1); 375 if (boolean(value(HALFDUPLEX))) 376 printf("\r\n"); 377 continue; 378 } else if (!cumode && gch == character(value(FORCE))) 379 gch = getchar()&0177; 380 bol = any(gch, value(EOL)); 381 if (boolean(value(RAISE)) && islower(gch)) 382 gch = toupper(gch); 383 pwrite(FD, &gch, 1); 384 if (boolean(value(HALFDUPLEX))) 385 printf("%c", gch); 386 } 387 } 388 389 /* 390 * Escape handler -- 391 * called on recognition of ``escapec'' at the beginning of a line 392 */ 393 escape() 394 { 395 register char gch; 396 register esctable_t *p; 397 char c = character(value(ESCAPE)); 398 extern esctable_t etable[]; 399 400 gch = (getchar()&0177); 401 for (p = etable; p->e_char; p++) 402 if (p->e_char == gch) { 403 if ((p->e_flags&PRIV) && uid) 404 continue; 405 printf("%s", ctrl(c)); 406 (*p->e_func)(gch); 407 return (0); 408 } 409 /* ESCAPE ESCAPE forces ESCAPE */ 410 if (c != gch) 411 pwrite(FD, &c, 1); 412 return (gch); 413 } 414 415 speed(n) 416 int n; 417 { 418 register int *p; 419 420 for (p = bauds; *p != -1; p++) 421 if (*p == n) 422 return (p - bauds); 423 return (NULL); 424 } 425 426 any(c, p) 427 register char c, *p; 428 { 429 while (p && *p) 430 if (*p++ == c) 431 return (1); 432 return (0); 433 } 434 435 size(s) 436 register char *s; 437 { 438 register int i = 0; 439 440 while (s && *s++) 441 i++; 442 return (i); 443 } 444 445 char * 446 interp(s) 447 register char *s; 448 { 449 static char buf[256]; 450 register char *p = buf, c, *q; 451 452 while (c = *s++) { 453 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 454 if (*q++ == c) { 455 *p++ = '\\'; *p++ = *q; 456 goto next; 457 } 458 if (c < 040) { 459 *p++ = '^'; *p++ = c + 'A'-1; 460 } else if (c == 0177) { 461 *p++ = '^'; *p++ = '?'; 462 } else 463 *p++ = c; 464 next: 465 ; 466 } 467 *p = '\0'; 468 return (buf); 469 } 470 471 char * 472 ctrl(c) 473 char c; 474 { 475 static char s[3]; 476 477 if (c < 040 || c == 0177) { 478 s[0] = '^'; 479 s[1] = c == 0177 ? '?' : c+'A'-1; 480 s[2] = '\0'; 481 } else { 482 s[0] = c; 483 s[1] = '\0'; 484 } 485 return (s); 486 } 487 488 /* 489 * Help command 490 */ 491 help(c) 492 char c; 493 { 494 register esctable_t *p; 495 extern esctable_t etable[]; 496 497 printf("%c\r\n", c); 498 for (p = etable; p->e_char; p++) { 499 if ((p->e_flags&PRIV) && uid) 500 continue; 501 printf("%2s", ctrl(character(value(ESCAPE)))); 502 printf("%-2s %c %s\r\n", ctrl(p->e_char), 503 p->e_flags&EXP ? '*': ' ', p->e_help); 504 } 505 } 506 507 /* 508 * Set up the "remote" tty's state 509 */ 510 ttysetup(speed) 511 int speed; 512 { 513 unsigned bits = LDECCTQ; 514 515 arg.sg_ispeed = arg.sg_ospeed = speed; 516 arg.sg_flags = RAW; 517 if (boolean(value(TAND))) 518 arg.sg_flags |= TANDEM; 519 ioctl(FD, TIOCSETP, (char *)&arg); 520 ioctl(FD, TIOCLBIS, (char *)&bits); 521 } 522 523 /* 524 * Return "simple" name from a file name, 525 * strip leading directories. 526 */ 527 char * 528 sname(s) 529 register char *s; 530 { 531 register char *p = s; 532 533 while (*s) 534 if (*s++ == '/') 535 p = s; 536 return (p); 537 } 538 539 static char partab[0200]; 540 static int bits8; 541 542 /* 543 * Do a write to the remote machine with the correct parity. 544 * We are doing 8 bit wide output, so we just generate a character 545 * with the right parity and output it. 546 */ 547 pwrite(fd, buf, n) 548 int fd; 549 char *buf; 550 register int n; 551 { 552 register int i; 553 register char *bp; 554 extern int errno; 555 556 bp = buf; 557 if (bits8 == 0) { 558 static char *mbp; static sz; 559 560 if (mbp == 0 || n > sz) { 561 if (mbp) 562 free(mbp); 563 mbp = (char *) malloc(n); 564 sz = n; 565 } 566 567 bp = mbp; 568 for (i = 0; i < n; i++) 569 *bp++ = partab[*buf++ & 0177]; 570 bp = mbp; 571 } 572 if (write(fd, bp, n) < 0) { 573 if (errno == EIO) 574 tipabort("Lost carrier."); 575 /* this is questionable */ 576 perror("write"); 577 } 578 } 579 580 /* 581 * Build a parity table with appropriate high-order bit. 582 */ 583 setparity(defparity) 584 char *defparity; 585 { 586 register int i, flip, clr, set; 587 char *parity; 588 extern char evenpartab[]; 589 590 if (value(PARITY) == NOSTR) 591 value(PARITY) = defparity; 592 parity = value(PARITY); 593 if (equal(parity, "none")) { 594 bits8 = 1; 595 return; 596 } 597 bits8 = 0; 598 flip = 0; 599 clr = 0377; 600 set = 0; 601 if (equal(parity, "odd")) 602 flip = 0200; /* reverse bit 7 */ 603 else if (equal(parity, "zero")) 604 clr = 0177; /* turn off bit 7 */ 605 else if (equal(parity, "one")) 606 set = 0200; /* turn on bit 7 */ 607 else if (!equal(parity, "even")) { 608 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 609 (void) fflush(stderr); 610 } 611 for (i = 0; i < 0200; i++) 612 partab[i] = evenpartab[i] ^ flip | set & clr; 613 } 614
Indexes created Tue Sep 23 07:09:52 GMT 2025