tip.c revision 1.5
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[] = "from: @(#)tip.c 5.15 (Berkeley) 2/4/91";*/ 42 static char rcsid[] = "$Id: tip.c,v 1.5 1994/04/20 17:21:28 pk Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * tip - UNIX link to other systems 47 * tip [-v] [-speed] system-name 48 * or 49 * cu phone-number [-s speed] [-l line] [-a acu] 50 */ 51 #include "tip.h" 52 #include "pathnames.h" 53 54 /* 55 * Baud rate mapping table 56 */ 57 int bauds[] = { 58 0, 50, 75, 110, 134, 150, 200, 300, 600, 59 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, -1 60 }; 61 62 int disc = OTTYDISC; /* tip normally runs this way */ 63 void intprompt(); 64 void timeout(); 65 void cleanup(); 66 char *sname(); 67 char PNbuf[256]; /* This limits the size of a number */ 68 69 main(argc, argv) 70 char *argv[]; 71 { 72 char *system = NOSTR; 73 register int i; 74 register char *p; 75 char sbuf[12]; 76 77 gid = getgid(); 78 egid = getegid(); 79 uid = getuid(); 80 euid = geteuid(); 81 if (equal(sname(argv[0]), "cu")) { 82 cumode = 1; 83 cumain(argc, argv); 84 goto cucommon; 85 } 86 87 if (argc > 4) { 88 fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n"); 89 exit(1); 90 } 91 if (!isatty(0)) { 92 fprintf(stderr, "tip: must be interactive\n"); 93 exit(1); 94 } 95 96 for (; argc > 1; argv++, argc--) { 97 if (argv[1][0] != '-') 98 system = argv[1]; 99 else switch (argv[1][1]) { 100 101 case 'v': 102 vflag++; 103 break; 104 105 case '0': case '1': case '2': case '3': case '4': 106 case '5': case '6': case '7': case '8': case '9': 107 BR = atoi(&argv[1][1]); 108 break; 109 110 default: 111 fprintf(stderr, "tip: %s, unknown option\n", argv[1]); 112 break; 113 } 114 } 115 116 if (system == NOSTR) 117 goto notnumber; 118 if (isalpha(*system)) 119 goto notnumber; 120 /* 121 * System name is really a phone number... 122 * Copy the number then stomp on the original (in case the number 123 * is private, we don't want 'ps' or 'w' to find it). 124 */ 125 if (strlen(system) > sizeof PNbuf - 1) { 126 fprintf(stderr, "tip: phone number too long (max = %d bytes)\n", 127 sizeof PNbuf - 1); 128 exit(1); 129 } 130 strncpy( PNbuf, system, sizeof PNbuf - 1 ); 131 for (p = system; *p; p++) 132 *p = '\0'; 133 PN = PNbuf; 134 (void)sprintf(sbuf, "tip%d", BR); 135 system = sbuf; 136 137 notnumber: 138 (void)signal(SIGINT, cleanup); 139 (void)signal(SIGQUIT, cleanup); 140 (void)signal(SIGHUP, cleanup); 141 (void)signal(SIGTERM, cleanup); 142 143 if ((i = hunt(system)) == 0) { 144 printf("all ports busy\n"); 145 exit(3); 146 } 147 if (i == -1) { 148 printf("link down\n"); 149 (void)uu_unlock(uucplock); 150 exit(3); 151 } 152 setbuf(stdout, NULL); 153 loginit(); 154 155 /* 156 * Now that we have the logfile and the ACU open 157 * return to the real uid and gid. These things will 158 * be closed on exit. Swap real and effective uid's 159 * so we can get the original permissions back 160 * for removing the uucp lock. 161 */ 162 user_uid(); 163 164 /* 165 * Kludge, their's no easy way to get the initialization 166 * in the right order, so force it here 167 */ 168 if ((PH = getenv("PHONES")) == NOSTR) 169 PH = _PATH_PHONES; 170 vinit(); /* init variables */ 171 setparity("even"); /* set the parity table */ 172 if ((i = speed(number(value(BAUDRATE)))) == NULL) { 173 printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); 174 daemon_uid(); 175 (void)uu_unlock(uucplock); 176 exit(3); 177 } 178 179 /* 180 * Hardwired connections require the 181 * line speed set before they make any transmissions 182 * (this is particularly true of things like a DF03-AC) 183 */ 184 if (HW) 185 ttysetup(i); 186 if (p = connect()) { 187 printf("\07%s\n[EOT]\n", p); 188 daemon_uid(); 189 (void)uu_unlock(uucplock); 190 exit(1); 191 } 192 if (!HW) 193 ttysetup(i); 194 cucommon: 195 /* 196 * From here down the code is shared with 197 * the "cu" version of tip. 198 */ 199 200 ioctl(0, TIOCGETP, (char *)&defarg); 201 ioctl(0, TIOCGETC, (char *)&defchars); 202 ioctl(0, TIOCGLTC, (char *)&deflchars); 203 ioctl(0, TIOCGETD, (char *)&odisc); 204 arg = defarg; 205 arg.sg_flags = ANYP | CBREAK; 206 tchars = defchars; 207 tchars.t_intrc = tchars.t_quitc = -1; 208 ltchars = deflchars; 209 ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc 210 = ltchars.t_lnextc = -1; 211 raw(); 212 213 pipe(fildes); pipe(repdes); 214 (void)signal(SIGALRM, timeout); 215 216 /* 217 * Everything's set up now: 218 * connection established (hardwired or dialup) 219 * line conditioned (baud rate, mode, etc.) 220 * internal data structures (variables) 221 * so, fork one process for local side and one for remote. 222 */ 223 printf(cumode ? "Connected\r\n" : "\07connected\r\n"); 224 if (pid = fork()) 225 tipin(); 226 else 227 tipout(); 228 /*NOTREACHED*/ 229 } 230 231 void 232 cleanup() 233 { 234 235 daemon_uid(); 236 (void)uu_unlock(uucplock); 237 if (odisc) 238 ioctl(0, TIOCSETD, (char *)&odisc); 239 exit(0); 240 } 241 242 /* 243 * Muck with user ID's. We are setuid to the owner of the lock 244 * directory when we start. user_uid() reverses real and effective 245 * ID's after startup, to run with the user's permissions. 246 * daemon_uid() switches back to the privileged uid for unlocking. 247 * Finally, to avoid running a shell with the wrong real uid, 248 * shell_uid() sets real and effective uid's to the user's real ID. 249 */ 250 static int uidswapped; 251 252 user_uid() 253 { 254 if (uidswapped == 0) { 255 setegid(gid); 256 seteuid(uid); 257 uidswapped = 1; 258 } 259 } 260 261 daemon_uid() 262 { 263 264 if (uidswapped) { 265 seteuid(euid); 266 setegid(egid); 267 uidswapped = 0; 268 } 269 } 270 271 shell_uid() 272 { 273 274 setgid(gid); 275 setuid(uid); 276 } 277 278 /* 279 * put the controlling keyboard into raw mode 280 */ 281 raw() 282 { 283 284 ioctl(0, TIOCSETP, &arg); 285 ioctl(0, TIOCSETC, &tchars); 286 ioctl(0, TIOCSLTC, <chars); 287 ioctl(0, TIOCSETD, (char *)&disc); 288 } 289 290 291 /* 292 * return keyboard to normal mode 293 */ 294 unraw() 295 { 296 297 ioctl(0, TIOCSETD, (char *)&odisc); 298 ioctl(0, TIOCSETP, (char *)&defarg); 299 ioctl(0, TIOCSETC, (char *)&defchars); 300 ioctl(0, TIOCSLTC, (char *)&deflchars); 301 } 302 303 static jmp_buf promptbuf; 304 305 /* 306 * Print string ``s'', then read a string 307 * in from the terminal. Handles signals & allows use of 308 * normal erase and kill characters. 309 */ 310 prompt(s, p) 311 char *s; 312 register char *p; 313 { 314 register char *b = p; 315 sig_t oint, oquit; 316 317 stoprompt = 0; 318 oint = signal(SIGINT, intprompt); 319 oquit = signal(SIGQUIT, SIG_IGN); 320 unraw(); 321 printf("%s", s); 322 if (setjmp(promptbuf) == 0) 323 while ((*p = getchar()) != EOF && *p != '\n') 324 p++; 325 *p = '\0'; 326 327 raw(); 328 (void)signal(SIGINT, oint); 329 (void)signal(SIGQUIT, oquit); 330 return (stoprompt || p == b); 331 } 332 333 /* 334 * Interrupt service routine during prompting 335 */ 336 void 337 intprompt() 338 { 339 340 (void)signal(SIGINT, SIG_IGN); 341 stoprompt = 1; 342 printf("\r\n"); 343 longjmp(promptbuf, 1); 344 } 345 346 /* 347 * ****TIPIN TIPIN**** 348 */ 349 tipin() 350 { 351 char gch, bol = 1; 352 353 /* 354 * Kinda klugey here... 355 * check for scripting being turned on from the .tiprc file, 356 * but be careful about just using setscript(), as we may 357 * send a SIGEMT before tipout has a chance to set up catching 358 * it; so wait a second, then setscript() 359 */ 360 if (boolean(value(SCRIPT))) { 361 sleep(1); 362 setscript(); 363 } 364 365 while (1) { 366 gch = getchar()&0177; 367 if ((gch == character(value(ESCAPE))) && bol) { 368 if (!(gch = escape())) 369 continue; 370 } else if (!cumode && gch == character(value(RAISECHAR))) { 371 boolean(value(RAISE)) = !boolean(value(RAISE)); 372 continue; 373 } else if (gch == '\r') { 374 bol = 1; 375 pwrite(FD, &gch, 1); 376 if (boolean(value(HALFDUPLEX))) 377 printf("\r\n"); 378 continue; 379 } else if (!cumode && gch == character(value(FORCE))) 380 gch = getchar()&0177; 381 bol = any(gch, value(EOL)); 382 if (boolean(value(RAISE)) && islower(gch)) 383 gch = toupper(gch); 384 pwrite(FD, &gch, 1); 385 if (boolean(value(HALFDUPLEX))) 386 printf("%c", gch); 387 } 388 } 389 390 /* 391 * Escape handler -- 392 * called on recognition of ``escapec'' at the beginning of a line 393 */ 394 escape() 395 { 396 register char gch; 397 register esctable_t *p; 398 char c = character(value(ESCAPE)); 399 extern esctable_t etable[]; 400 401 gch = (getchar()&0177); 402 for (p = etable; p->e_char; p++) 403 if (p->e_char == gch) { 404 if ((p->e_flags&PRIV) && uid) 405 continue; 406 printf("%s", ctrl(c)); 407 (*p->e_func)(gch); 408 return (0); 409 } 410 /* ESCAPE ESCAPE forces ESCAPE */ 411 if (c != gch) 412 pwrite(FD, &c, 1); 413 return (gch); 414 } 415 416 speed(n) 417 int n; 418 { 419 register int *p; 420 421 for (p = bauds; *p != -1; p++) 422 if (*p == n) 423 return (p - bauds); 424 return (NULL); 425 } 426 427 any(c, p) 428 register char c, *p; 429 { 430 while (p && *p) 431 if (*p++ == c) 432 return (1); 433 return (0); 434 } 435 436 size(s) 437 register char *s; 438 { 439 register int i = 0; 440 441 while (s && *s++) 442 i++; 443 return (i); 444 } 445 446 char * 447 interp(s) 448 register char *s; 449 { 450 static char buf[256]; 451 register char *p = buf, c, *q; 452 453 while (c = *s++) { 454 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 455 if (*q++ == c) { 456 *p++ = '\\'; *p++ = *q; 457 goto next; 458 } 459 if (c < 040) { 460 *p++ = '^'; *p++ = c + 'A'-1; 461 } else if (c == 0177) { 462 *p++ = '^'; *p++ = '?'; 463 } else 464 *p++ = c; 465 next: 466 ; 467 } 468 *p = '\0'; 469 return (buf); 470 } 471 472 char * 473 ctrl(c) 474 char c; 475 { 476 static char s[3]; 477 478 if (c < 040 || c == 0177) { 479 s[0] = '^'; 480 s[1] = c == 0177 ? '?' : c+'A'-1; 481 s[2] = '\0'; 482 } else { 483 s[0] = c; 484 s[1] = '\0'; 485 } 486 return (s); 487 } 488 489 /* 490 * Help command 491 */ 492 help(c) 493 char c; 494 { 495 register esctable_t *p; 496 extern esctable_t etable[]; 497 498 printf("%c\r\n", c); 499 for (p = etable; p->e_char; p++) { 500 if ((p->e_flags&PRIV) && uid) 501 continue; 502 printf("%2s", ctrl(character(value(ESCAPE)))); 503 printf("%-2s %c %s\r\n", ctrl(p->e_char), 504 p->e_flags&EXP ? '*': ' ', p->e_help); 505 } 506 } 507 508 /* 509 * Set up the "remote" tty's state 510 */ 511 ttysetup(speed) 512 int speed; 513 { 514 unsigned bits = LDECCTQ; 515 516 arg.sg_ispeed = arg.sg_ospeed = speed; 517 arg.sg_flags = RAW; 518 if (boolean(value(TAND))) 519 arg.sg_flags |= TANDEM; 520 ioctl(FD, TIOCSETP, (char *)&arg); 521 ioctl(FD, TIOCLBIS, (char *)&bits); 522 } 523 524 /* 525 * Return "simple" name from a file name, 526 * strip leading directories. 527 */ 528 char * 529 sname(s) 530 register char *s; 531 { 532 register char *p = s; 533 534 while (*s) 535 if (*s++ == '/') 536 p = s; 537 return (p); 538 } 539 540 static char partab[0200]; 541 static int bits8; 542 543 /* 544 * Do a write to the remote machine with the correct parity. 545 * We are doing 8 bit wide output, so we just generate a character 546 * with the right parity and output it. 547 */ 548 pwrite(fd, buf, n) 549 int fd; 550 char *buf; 551 register int n; 552 { 553 register int i; 554 register char *bp; 555 extern int errno; 556 557 bp = buf; 558 if (bits8 == 0) { 559 static char *mbp; static sz; 560 561 if (mbp == 0 || n > sz) { 562 if (mbp) 563 free(mbp); 564 mbp = (char *) malloc(n); 565 sz = n; 566 } 567 568 bp = mbp; 569 for (i = 0; i < n; i++) 570 *bp++ = partab[*buf++ & 0177]; 571 bp = mbp; 572 } 573 if (write(fd, bp, n) < 0) { 574 if (errno == EIO) 575 tipabort("Lost carrier."); 576 /* this is questionable */ 577 perror("write"); 578 } 579 } 580 581 /* 582 * Build a parity table with appropriate high-order bit. 583 */ 584 setparity(defparity) 585 char *defparity; 586 { 587 register int i, flip, clr, set; 588 char *parity; 589 extern char evenpartab[]; 590 591 if (value(PARITY) == NOSTR) 592 value(PARITY) = defparity; 593 parity = value(PARITY); 594 if (equal(parity, "none")) { 595 bits8 = 1; 596 return; 597 } 598 bits8 = 0; 599 flip = 0; 600 clr = 0377; 601 set = 0; 602 if (equal(parity, "odd")) 603 flip = 0200; /* reverse bit 7 */ 604 else if (equal(parity, "zero")) 605 clr = 0177; /* turn off bit 7 */ 606 else if (equal(parity, "one")) 607 set = 0200; /* turn on bit 7 */ 608 else if (!equal(parity, "even")) { 609 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 610 (void) fflush(stderr); 611 } 612 for (i = 0; i < 0200; i++) 613 partab[i] = evenpartab[i] ^ flip | set & clr; 614 } 615
Indexes created Tue Sep 23 02:09:52 GMT 2025