1 /* $NetBSD: tip.c,v 1.6 1994/12/08 09:31:07 jtc Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93"; 45 #endif 46 static char rcsid[] = "$NetBSD: tip.c,v 1.6 1994/12/08 09:31:07 jtc Exp $"; 47 #endif /* not lint */ 48 49 /* 50 * tip - UNIX link to other systems 51 * tip [-v] [-speed] system-name 52 * or 53 * cu phone-number [-s speed] [-l line] [-a acu] 54 */ 55 #include "tip.h" 56 #include "pathnames.h" 57 58 /* 59 * Baud rate mapping table 60 */ 61 int bauds[] = { 62 0, 50, 75, 110, 134, 150, 200, 300, 600, 63 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200, -1 64 }; 65 66 int disc = OTTYDISC; /* tip normally runs this way */ 67 void intprompt(); 68 void timeout(); 69 void cleanup(); 70 char *sname(); 71 char PNbuf[256]; /* This limits the size of a number */ 72 73 main(argc, argv) 74 char *argv[]; 75 { 76 char *system = NOSTR; 77 register int i; 78 register char *p; 79 char sbuf[12]; 80 81 gid = getgid(); 82 egid = getegid(); 83 uid = getuid(); 84 euid = geteuid(); 85 if (equal(sname(argv[0]), "cu")) { 86 cumode = 1; 87 cumain(argc, argv); 88 goto cucommon; 89 } 90 91 if (argc > 4) { 92 fprintf(stderr, "usage: tip [-v] [-speed] [system-name]\n"); 93 exit(1); 94 } 95 if (!isatty(0)) { 96 fprintf(stderr, "tip: must be interactive\n"); 97 exit(1); 98 } 99 100 for (; argc > 1; argv++, argc--) { 101 if (argv[1][0] != '-') 102 system = argv[1]; 103 else switch (argv[1][1]) { 104 105 case 'v': 106 vflag++; 107 break; 108 109 case '0': case '1': case '2': case '3': case '4': 110 case '5': case '6': case '7': case '8': case '9': 111 BR = atoi(&argv[1][1]); 112 break; 113 114 default: 115 fprintf(stderr, "tip: %s, unknown option\n", argv[1]); 116 break; 117 } 118 } 119 120 if (system == NOSTR) 121 goto notnumber; 122 if (isalpha(*system)) 123 goto notnumber; 124 /* 125 * System name is really a phone number... 126 * Copy the number then stomp on the original (in case the number 127 * is private, we don't want 'ps' or 'w' to find it). 128 */ 129 if (strlen(system) > sizeof PNbuf - 1) { 130 fprintf(stderr, "tip: phone number too long (max = %d bytes)\n", 131 sizeof PNbuf - 1); 132 exit(1); 133 } 134 strncpy( PNbuf, system, sizeof PNbuf - 1 ); 135 for (p = system; *p; p++) 136 *p = '\0'; 137 PN = PNbuf; 138 (void)sprintf(sbuf, "tip%d", BR); 139 system = sbuf; 140 141 notnumber: 142 (void)signal(SIGINT, cleanup); 143 (void)signal(SIGQUIT, cleanup); 144 (void)signal(SIGHUP, cleanup); 145 (void)signal(SIGTERM, cleanup); 146 147 if ((i = hunt(system)) == 0) { 148 printf("all ports busy\n"); 149 exit(3); 150 } 151 if (i == -1) { 152 printf("link down\n"); 153 (void)uu_unlock(uucplock); 154 exit(3); 155 } 156 setbuf(stdout, NULL); 157 loginit(); 158 159 /* 160 * Now that we have the logfile and the ACU open 161 * return to the real uid and gid. These things will 162 * be closed on exit. Swap real and effective uid's 163 * so we can get the original permissions back 164 * for removing the uucp lock. 165 */ 166 user_uid(); 167 168 /* 169 * Kludge, their's no easy way to get the initialization 170 * in the right order, so force it here 171 */ 172 if ((PH = getenv("PHONES")) == NOSTR) 173 PH = _PATH_PHONES; 174 vinit(); /* init variables */ 175 setparity("even"); /* set the parity table */ 176 if ((i = speed(number(value(BAUDRATE)))) == NULL) { 177 printf("tip: bad baud rate %d\n", number(value(BAUDRATE))); 178 daemon_uid(); 179 (void)uu_unlock(uucplock); 180 exit(3); 181 } 182 183 /* 184 * Hardwired connections require the 185 * line speed set before they make any transmissions 186 * (this is particularly true of things like a DF03-AC) 187 */ 188 if (HW) 189 ttysetup(i); 190 if (p = connect()) { 191 printf("\07%s\n[EOT]\n", p); 192 daemon_uid(); 193 (void)uu_unlock(uucplock); 194 exit(1); 195 } 196 if (!HW) 197 ttysetup(i); 198 cucommon: 199 /* 200 * From here down the code is shared with 201 * the "cu" version of tip. 202 */ 203 204 ioctl(0, TIOCGETP, (char *)&defarg); 205 ioctl(0, TIOCGETC, (char *)&defchars); 206 ioctl(0, TIOCGLTC, (char *)&deflchars); 207 ioctl(0, TIOCGETD, (char *)&odisc); 208 arg = defarg; 209 arg.sg_flags = ANYP | CBREAK; 210 tchars = defchars; 211 tchars.t_intrc = tchars.t_quitc = -1; 212 ltchars = deflchars; 213 ltchars.t_suspc = ltchars.t_dsuspc = ltchars.t_flushc 214 = ltchars.t_lnextc = -1; 215 raw(); 216 217 pipe(fildes); pipe(repdes); 218 (void)signal(SIGALRM, timeout); 219 220 /* 221 * Everything's set up now: 222 * connection established (hardwired or dialup) 223 * line conditioned (baud rate, mode, etc.) 224 * internal data structures (variables) 225 * so, fork one process for local side and one for remote. 226 */ 227 printf(cumode ? "Connected\r\n" : "\07connected\r\n"); 228 if (pid = fork()) 229 tipin(); 230 else 231 tipout(); 232 /*NOTREACHED*/ 233 } 234 235 void 236 cleanup() 237 { 238 239 daemon_uid(); 240 (void)uu_unlock(uucplock); 241 if (odisc) 242 ioctl(0, TIOCSETD, (char *)&odisc); 243 exit(0); 244 } 245 246 /* 247 * Muck with user ID's. We are setuid to the owner of the lock 248 * directory when we start. user_uid() reverses real and effective 249 * ID's after startup, to run with the user's permissions. 250 * daemon_uid() switches back to the privileged uid for unlocking. 251 * Finally, to avoid running a shell with the wrong real uid, 252 * shell_uid() sets real and effective uid's to the user's real ID. 253 */ 254 static int uidswapped; 255 256 user_uid() 257 { 258 if (uidswapped == 0) { 259 seteuid(uid); 260 uidswapped = 1; 261 } 262 } 263 264 daemon_uid() 265 { 266 267 if (uidswapped) { 268 seteuid(euid); 269 uidswapped = 0; 270 } 271 } 272 273 shell_uid() 274 { 275 seteuid(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 extern esctable_t etable[]; 391 392 /* 393 * Escape handler -- 394 * called on recognition of ``escapec'' at the beginning of a line 395 */ 396 escape() 397 { 398 register char gch; 399 register esctable_t *p; 400 char c = character(value(ESCAPE)); 401 402 gch = (getchar()&0177); 403 for (p = etable; p->e_char; p++) 404 if (p->e_char == gch) { 405 if ((p->e_flags&PRIV) && uid) 406 continue; 407 printf("%s", ctrl(c)); 408 (*p->e_func)(gch); 409 return (0); 410 } 411 /* ESCAPE ESCAPE forces ESCAPE */ 412 if (c != gch) 413 pwrite(FD, &c, 1); 414 return (gch); 415 } 416 417 speed(n) 418 int n; 419 { 420 register int *p; 421 422 for (p = bauds; *p != -1; p++) 423 if (*p == n) 424 return (p - bauds); 425 return (NULL); 426 } 427 428 any(c, p) 429 register char c, *p; 430 { 431 while (p && *p) 432 if (*p++ == c) 433 return (1); 434 return (0); 435 } 436 437 size(s) 438 register char *s; 439 { 440 register int i = 0; 441 442 while (s && *s++) 443 i++; 444 return (i); 445 } 446 447 char * 448 interp(s) 449 register char *s; 450 { 451 static char buf[256]; 452 register char *p = buf, c, *q; 453 454 while (c = *s++) { 455 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 456 if (*q++ == c) { 457 *p++ = '\\'; *p++ = *q; 458 goto next; 459 } 460 if (c < 040) { 461 *p++ = '^'; *p++ = c + 'A'-1; 462 } else if (c == 0177) { 463 *p++ = '^'; *p++ = '?'; 464 } else 465 *p++ = c; 466 next: 467 ; 468 } 469 *p = '\0'; 470 return (buf); 471 } 472 473 char * 474 ctrl(c) 475 char c; 476 { 477 static char s[3]; 478 479 if (c < 040 || c == 0177) { 480 s[0] = '^'; 481 s[1] = c == 0177 ? '?' : c+'A'-1; 482 s[2] = '\0'; 483 } else { 484 s[0] = c; 485 s[1] = '\0'; 486 } 487 return (s); 488 } 489 490 /* 491 * Help command 492 */ 493 help(c) 494 char c; 495 { 496 register esctable_t *p; 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 for (i = 0; i < n; i++) { 560 *bp = partab[(*bp) & 0177]; 561 bp++; 562 } 563 if (write(fd, buf, n) < 0) { 564 if (errno == EIO) 565 tipabort("Lost carrier."); 566 /* this is questionable */ 567 perror("write"); 568 } 569 } 570 571 /* 572 * Build a parity table with appropriate high-order bit. 573 */ 574 setparity(defparity) 575 char *defparity; 576 { 577 register int i, flip, clr, set; 578 char *parity; 579 extern char evenpartab[]; 580 581 if (value(PARITY) == NOSTR) 582 value(PARITY) = defparity; 583 parity = value(PARITY); 584 if (equal(parity, "none")) { 585 bits8 = 1; 586 return; 587 } 588 bits8 = 0; 589 flip = 0; 590 clr = 0377; 591 set = 0; 592 if (equal(parity, "odd")) 593 flip = 0200; /* reverse bit 7 */ 594 else if (equal(parity, "zero")) 595 clr = 0177; /* turn off bit 7 */ 596 else if (equal(parity, "one")) 597 set = 0200; /* turn on bit 7 */ 598 else if (!equal(parity, "even")) { 599 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 600 (void) fflush(stderr); 601 } 602 for (i = 0; i < 0200; i++) 603 partab[i] = evenpartab[i] ^ flip | set & clr; 604 } 605