1 /* $NetBSD: tip.c,v 1.14 1997/05/14 00:20:05 mellon 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 1.14 1997/05/14 00:20:05 mellon 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 rates[] = { 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 = TTYDISC; /* 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)snprintf(sbuf, sizeof 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)))) == 0) { 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 tcgetattr(0, &defterm); 205 term = defterm; 206 term.c_lflag &= ~(ICANON|IEXTEN|ECHO); 207 term.c_iflag &= ~(INPCK|ICRNL); 208 term.c_oflag &= ~OPOST; 209 term.c_cc[VMIN] = 1; 210 term.c_cc[VTIME] = 0; 211 defchars = term; 212 term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] = 213 term.c_cc[VDSUSP] = term.c_cc[VDISCARD] = 214 term.c_cc[VLNEXT] = _POSIX_VDISABLE; 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 tcsetattr(0, TCSADRAIN, &term); 284 } 285 286 287 /* 288 * return keyboard to normal mode 289 */ 290 unraw() 291 { 292 tcsetattr(0, TCSADRAIN, &defterm); 293 } 294 295 static jmp_buf promptbuf; 296 297 /* 298 * Print string ``s'', then read a string 299 * in from the terminal. Handles signals & allows use of 300 * normal erase and kill characters. 301 */ 302 prompt(s, p) 303 char *s; 304 register char *p; 305 { 306 register int c; 307 register char *b = p; 308 sig_t oint, oquit; 309 310 stoprompt = 0; 311 oint = signal(SIGINT, intprompt); 312 oquit = signal(SIGQUIT, SIG_IGN); 313 unraw(); 314 printf("%s", s); 315 if (setjmp(promptbuf) == 0) 316 while ((c = getchar()) != -1 && (*p = c) != '\n') 317 p++; 318 *p = '\0'; 319 320 raw(); 321 (void)signal(SIGINT, oint); 322 (void)signal(SIGQUIT, oquit); 323 return (stoprompt || p == b); 324 } 325 326 /* 327 * Interrupt service routine during prompting 328 */ 329 void 330 intprompt() 331 { 332 333 (void)signal(SIGINT, SIG_IGN); 334 stoprompt = 1; 335 printf("\r\n"); 336 longjmp(promptbuf, 1); 337 } 338 339 /* 340 * ****TIPIN TIPIN**** 341 */ 342 tipin() 343 { 344 char gch, bol = 1; 345 346 /* 347 * Kinda klugey here... 348 * check for scripting being turned on from the .tiprc file, 349 * but be careful about just using setscript(), as we may 350 * send a SIGEMT before tipout has a chance to set up catching 351 * it; so wait a second, then setscript() 352 */ 353 if (boolean(value(SCRIPT))) { 354 sleep(1); 355 setscript(); 356 } 357 358 while (1) { 359 gch = getchar()&STRIP_PAR; 360 if ((gch == character(value(ESCAPE))) && bol) { 361 if (!(gch = escape())) 362 continue; 363 } else if (!cumode && gch == character(value(RAISECHAR))) { 364 setboolean(value(RAISE), !boolean(value(RAISE))); 365 continue; 366 } else if (gch == '\r') { 367 bol = 1; 368 pwrite(FD, &gch, 1); 369 if (boolean(value(HALFDUPLEX))) 370 printf("\r\n"); 371 continue; 372 } else if (!cumode && gch == character(value(FORCE))) 373 gch = getchar()&STRIP_PAR; 374 bol = any(gch, value(EOL)); 375 if (boolean(value(RAISE)) && islower(gch)) 376 gch = toupper(gch); 377 pwrite(FD, &gch, 1); 378 if (boolean(value(HALFDUPLEX))) 379 printf("%c", gch); 380 } 381 } 382 383 extern esctable_t etable[]; 384 385 /* 386 * Escape handler -- 387 * called on recognition of ``escapec'' at the beginning of a line 388 */ 389 escape() 390 { 391 register char gch; 392 register esctable_t *p; 393 char c = character(value(ESCAPE)); 394 395 gch = (getchar()&STRIP_PAR); 396 for (p = etable; p->e_char; p++) 397 if (p->e_char == gch) { 398 if ((p->e_flags&PRIV) && uid) 399 continue; 400 printf("%s", ctrl(c)); 401 (*p->e_func)(gch); 402 return (0); 403 } 404 /* ESCAPE ESCAPE forces ESCAPE */ 405 if (c != gch) 406 pwrite(FD, &c, 1); 407 return (gch); 408 } 409 410 speed(n) 411 int n; 412 { 413 register int *p; 414 415 for (p = rates; *p != -1; p++) 416 if (*p == n) 417 return n; 418 return 0; 419 } 420 421 any(c, p) 422 register char c, *p; 423 { 424 while (p && *p) 425 if (*p++ == c) 426 return (1); 427 return (0); 428 } 429 430 size(s) 431 register char *s; 432 { 433 register int i = 0; 434 435 while (s && *s++) 436 i++; 437 return (i); 438 } 439 440 char * 441 interp(s) 442 register char *s; 443 { 444 static char buf[256]; 445 register char *p = buf, c, *q; 446 447 while (c = *s++) { 448 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 449 if (*q++ == c) { 450 *p++ = '\\'; *p++ = *q; 451 goto next; 452 } 453 if (c < 040) { 454 *p++ = '^'; *p++ = c + 'A'-1; 455 } else if (c == 0177) { 456 *p++ = '^'; *p++ = '?'; 457 } else 458 *p++ = c; 459 next: 460 ; 461 } 462 *p = '\0'; 463 return (buf); 464 } 465 466 char * 467 ctrl(c) 468 char c; 469 { 470 static char s[3]; 471 472 if (c < 040 || c == 0177) { 473 s[0] = '^'; 474 s[1] = c == 0177 ? '?' : c+'A'-1; 475 s[2] = '\0'; 476 } else { 477 s[0] = c; 478 s[1] = '\0'; 479 } 480 return (s); 481 } 482 483 /* 484 * Help command 485 */ 486 help(c) 487 char c; 488 { 489 register esctable_t *p; 490 491 printf("%c\r\n", c); 492 for (p = etable; p->e_char; p++) { 493 if ((p->e_flags&PRIV) && uid) 494 continue; 495 printf("%2s", ctrl(character(value(ESCAPE)))); 496 printf("%-2s %c %s\r\n", ctrl(p->e_char), 497 p->e_flags&EXP ? '*': ' ', p->e_help); 498 } 499 } 500 501 /* 502 * Set up the "remote" tty's state 503 */ 504 ttysetup(speed) 505 int speed; 506 { 507 struct termios cntrl; 508 509 tcgetattr(FD, &cntrl); 510 cfsetospeed(&cntrl, speed); 511 cfsetispeed(&cntrl, speed); 512 cntrl.c_cflag &= ~(CSIZE|PARENB); 513 cntrl.c_cflag |= CS8; 514 if (DC) 515 cntrl.c_cflag |= CLOCAL; 516 cntrl.c_iflag &= ~(ISTRIP|ICRNL); 517 cntrl.c_oflag &= ~OPOST; 518 cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO); 519 cntrl.c_cc[VMIN] = 1; 520 cntrl.c_cc[VTIME] = 0; 521 if (boolean(value(TAND))) 522 cntrl.c_iflag |= IXOFF; 523 tcsetattr(FD, TCSAFLUSH, &cntrl); 524 } 525 526 /* 527 * Return "simple" name from a file name, 528 * strip leading directories. 529 */ 530 char * 531 sname(s) 532 register char *s; 533 { 534 register char *p = s; 535 536 while (*s) 537 if (*s++ == '/') 538 p = s; 539 return (p); 540 } 541 542 static char partab[0200]; 543 544 /* 545 * Do a write to the remote machine with the correct parity. 546 * We are doing 8 bit wide output, so we just generate a character 547 * with the right parity and output it. 548 */ 549 pwrite(fd, buf, n) 550 int fd; 551 char *buf; 552 register int n; 553 { 554 register int i; 555 register char *bp; 556 extern int errno; 557 558 bp = buf; 559 if (bits8 == 0) 560 for (i = 0; i < n; i++) { 561 *bp = partab[(*bp) & 0177]; 562 bp++; 563 } 564 if (write(fd, buf, n) < 0) { 565 if (errno == EIO) 566 tipabort("Lost carrier."); 567 /* this is questionable */ 568 perror("write"); 569 } 570 } 571 572 /* 573 * Build a parity table with appropriate high-order bit. 574 */ 575 setparity(defparity) 576 char *defparity; 577 { 578 register int i, flip, clr, set; 579 char *parity; 580 extern unsigned char evenpartab[]; 581 582 if (value(PARITY) == NOSTR) 583 value(PARITY) = defparity; 584 parity = value(PARITY); 585 if (equal(parity, "none")) { 586 bits8 = 1; 587 return; 588 } 589 bits8 = 0; 590 flip = 0; 591 clr = 0377; 592 set = 0; 593 if (equal(parity, "odd")) 594 flip = 0200; /* reverse bit 7 */ 595 else if (equal(parity, "zero")) 596 clr = 0177; /* turn off bit 7 */ 597 else if (equal(parity, "one")) 598 set = 0200; /* turn on bit 7 */ 599 else if (!equal(parity, "even")) { 600 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 601 (void) fflush(stderr); 602 } 603 for (i = 0; i < 0200; i++) 604 partab[i] = (evenpartab[i] ^ flip | set) & clr; 605 } 606