tip.c revision 1.33
1 /* $NetBSD: tip.c,v 1.33 2006/04/02 19:04:24 tls 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)tip.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 __RCSID("$NetBSD: tip.c,v 1.33 2006/04/02 19:04:24 tls 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 int escape __P((void)); 55 int main __P((int, char **)); 56 void intprompt __P((int)); 57 void tipin __P((void)); 58 59 char PNbuf[256]; /* This limits the size of a number */ 60 61 static char path_phones[] = _PATH_PHONES; 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 char *System = NULL; 69 int i; 70 char *p; 71 const char *q; 72 char sbuf[12]; 73 int fcarg; 74 75 gid = getgid(); 76 egid = getegid(); 77 uid = getuid(); 78 euid = geteuid(); 79 if (equal(basename(argv[0]), "cu")) { 80 cumode = 1; 81 cumain(argc, argv); 82 goto cucommon; 83 } 84 85 if (argc > 4) { 86 fprintf(stderr, "usage: %s [-v] [-speed] [system-name]\n", 87 getprogname()); 88 exit(1); 89 } 90 if (!isatty(0)) { 91 fprintf(stderr, "%s: must be interactive\n", getprogname()); 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 warnx("%s, unknown option", argv[1]); 111 break; 112 } 113 } 114 115 if (System == NULL) 116 goto notnumber; 117 if (isalpha((unsigned char)*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 errx(1, "phone number too long (max = %d bytes)", 126 (int)sizeof(PNbuf) - 1); 127 } 128 (void)strlcpy(PNbuf, System, sizeof(PNbuf)); 129 for (p = System; *p; p++) 130 *p = '\0'; 131 PN = PNbuf; 132 (void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR); 133 System = sbuf; 134 135 notnumber: 136 (void)signal(SIGINT, cleanup); 137 (void)signal(SIGQUIT, cleanup); 138 (void)signal(SIGHUP, cleanup); 139 (void)signal(SIGTERM, cleanup); 140 141 if ((i = hunt(System)) == 0) { 142 printf("all ports busy\n"); 143 exit(3); 144 } 145 if (i == -1) { 146 printf("link down\n"); 147 (void)uu_unlock(uucplock); 148 exit(3); 149 } 150 setbuf(stdout, NULL); 151 loginit(); 152 153 /* 154 * Now that we have the logfile and the ACU open 155 * return to the real uid and gid. These things will 156 * be closed on exit. Swap real and effective uid's 157 * so we can get the original permissions back 158 * for removing the uucp lock. 159 */ 160 user_uid(); 161 162 /* 163 * Kludge, their's no easy way to get the initialization 164 * in the right order, so force it here 165 */ 166 if ((PH = getenv("PHONES")) == NULL) 167 PH = path_phones; 168 vinit(); /* init variables */ 169 setparity("none"); /* set the parity table */ 170 171 /* 172 * Hardwired connections require the 173 * line speed set before they make any transmissions 174 * (this is particularly true of things like a DF03-AC) 175 */ 176 if (HW) { 177 if (ttysetup(i) != 0) { 178 warnx("bad baud rate %d", 179 (int)number(value(BAUDRATE))); 180 daemon_uid(); 181 (void)uu_unlock(uucplock); 182 exit(3); 183 } 184 } 185 if ((q = connect()) != NULL) { 186 printf("\07%s\n[EOT]\n", q); 187 daemon_uid(); 188 (void)uu_unlock(uucplock); 189 exit(1); 190 } 191 if (!HW) { 192 if (ttysetup(i) != 0) { 193 warnx("bad baud rate %d", 194 (int)number(value(BAUDRATE))); 195 daemon_uid(); 196 (void)uu_unlock(uucplock); 197 exit(3); 198 } 199 } 200 201 202 /* 203 * Direct connections with no carrier require using O_NONBLOCK on 204 * open, but we don't want to keep O_NONBLOCK after open because it 205 * will cause busy waits. 206 */ 207 if (DC && 208 ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 || 209 fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) { 210 warn("can't clear O_NONBLOCK"); 211 daemon_uid(); 212 (void)uu_unlock(uucplock); 213 exit(1); 214 } 215 216 cucommon: 217 /* 218 * From here down the code is shared with 219 * the "cu" version of tip. 220 */ 221 222 tcgetattr(0, &defterm); 223 term = defterm; 224 term.c_lflag &= ~(ICANON|IEXTEN|ECHO); 225 term.c_iflag &= ~(INPCK|ICRNL); 226 term.c_oflag &= ~OPOST; 227 term.c_cc[VMIN] = 1; 228 term.c_cc[VTIME] = 0; 229 defchars = term; 230 term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] = 231 term.c_cc[VDSUSP] = term.c_cc[VDISCARD] = 232 term.c_cc[VLNEXT] = _POSIX_VDISABLE; 233 raw(); 234 235 pipe(fildes); pipe(repdes); 236 (void)signal(SIGALRM, alrmtimeout); 237 238 /* 239 * Everything's set up now: 240 * connection established (hardwired or dialup) 241 * line conditioned (baud rate, mode, etc.) 242 * internal data structures (variables) 243 * so, fork one process for local side and one for remote. 244 */ 245 printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n"); 246 switch (pid = fork()) { 247 default: 248 tipin(); 249 break; 250 case 0: 251 tipout(); 252 break; 253 case -1: 254 err(1, "can't fork"); 255 } 256 /*NOTREACHED*/ 257 exit(0); /* XXX: pacify gcc */ 258 } 259 260 void 261 cleanup(dummy) 262 int dummy; 263 { 264 265 daemon_uid(); 266 (void)uu_unlock(uucplock); 267 if (odisc) 268 ioctl(0, TIOCSETD, (char *)&odisc); 269 exit(0); 270 } 271 272 /* 273 * Muck with user ID's. We are setuid to the owner of the lock 274 * directory when we start. user_uid() reverses real and effective 275 * ID's after startup, to run with the user's permissions. 276 * daemon_uid() switches back to the privileged uid for unlocking. 277 * Finally, to avoid running a shell with the wrong real uid, 278 * shell_uid() sets real and effective uid's to the user's real ID. 279 */ 280 static int uidswapped; 281 282 void 283 user_uid() 284 { 285 286 if (uidswapped == 0) { 287 seteuid(uid); 288 uidswapped = 1; 289 } 290 } 291 292 void 293 daemon_uid() 294 { 295 296 if (uidswapped) { 297 seteuid(euid); 298 uidswapped = 0; 299 } 300 } 301 302 void 303 shell_uid() 304 { 305 306 seteuid(uid); 307 } 308 309 /* 310 * put the controlling keyboard into raw mode 311 */ 312 void 313 raw() 314 { 315 316 tcsetattr(0, TCSADRAIN, &term); 317 } 318 319 320 /* 321 * return keyboard to normal mode 322 */ 323 void 324 unraw() 325 { 326 327 tcsetattr(0, TCSADRAIN, &defterm); 328 } 329 330 static jmp_buf promptbuf; 331 332 /* 333 * Print string ``s'', then read a string 334 * in from the terminal. Handles signals & allows use of 335 * normal erase and kill characters. 336 */ 337 int 338 prompt(s, p, l) 339 const char *s; 340 char *p; 341 size_t l; 342 { 343 int c; 344 char *b = p; 345 sig_t oint, oquit; 346 347 #if __GNUC__ /* XXX: pacify gcc */ 348 (void)&p; 349 #endif 350 351 stoprompt = 0; 352 oint = signal(SIGINT, intprompt); 353 oquit = signal(SIGQUIT, SIG_IGN); 354 unraw(); 355 printf("%s", s); 356 if (setjmp(promptbuf) == 0) 357 while ((c = getchar()) != -1 && (*p = c) != '\n' && 358 b + l > p) 359 p++; 360 *p = '\0'; 361 362 raw(); 363 (void)signal(SIGINT, oint); 364 (void)signal(SIGQUIT, oquit); 365 return (stoprompt || p == b); 366 } 367 368 /* 369 * Interrupt service routine during prompting 370 */ 371 void 372 intprompt(dummy) 373 int dummy; 374 { 375 376 (void)signal(SIGINT, SIG_IGN); 377 stoprompt = 1; 378 printf("\r\n"); 379 longjmp(promptbuf, 1); 380 } 381 382 /* 383 * ****TIPIN TIPIN**** 384 */ 385 void 386 tipin() 387 { 388 char gch, bol = 1; 389 390 /* 391 * Kinda klugey here... 392 * check for scripting being turned on from the .tiprc file, 393 * but be careful about just using setscript(), as we may 394 * send a SIGEMT before tipout has a chance to set up catching 395 * it; so wait a second, then setscript() 396 */ 397 if (boolean(value(SCRIPT))) { 398 sleep(1); 399 setscript(); 400 } 401 402 while (1) { 403 gch = getchar()&STRIP_PAR; 404 if ((gch == character(value(ESCAPE))) && bol) { 405 if (!(gch = escape())) 406 continue; 407 } else if (!cumode && 408 gch && gch == character(value(RAISECHAR))) { 409 setboolean(value(RAISE), !boolean(value(RAISE))); 410 continue; 411 } else if (gch == '\r') { 412 bol = 1; 413 xpwrite(FD, &gch, 1); 414 if (boolean(value(HALFDUPLEX))) 415 printf("\r\n"); 416 continue; 417 } else if (!cumode && gch && gch == character(value(FORCE))) 418 gch = getchar()&STRIP_PAR; 419 bol = any(gch, value(EOL)); 420 if (boolean(value(RAISE)) && islower((unsigned char)gch)) 421 gch = toupper((unsigned char)gch); 422 xpwrite(FD, &gch, 1); 423 if (boolean(value(HALFDUPLEX))) 424 printf("%c", gch); 425 } 426 } 427 428 /* 429 * Escape handler -- 430 * called on recognition of ``escapec'' at the beginning of a line 431 */ 432 int 433 escape() 434 { 435 char gch; 436 esctable_t *p; 437 char c = character(value(ESCAPE)); 438 439 gch = (getchar()&STRIP_PAR); 440 for (p = etable; p->e_char; p++) 441 if (p->e_char == gch) { 442 if ((p->e_flags&PRIV) && uid) 443 continue; 444 printf("%s", ctrl(c)); 445 (*p->e_func)(gch); 446 return (0); 447 } 448 /* ESCAPE ESCAPE forces ESCAPE */ 449 if (c != gch) 450 xpwrite(FD, &c, 1); 451 return (gch); 452 } 453 454 int 455 any(c, p) 456 char c; 457 const char *p; 458 { 459 460 while (p && *p) 461 if (*p++ == c) 462 return (1); 463 return (0); 464 } 465 466 char * 467 interp(s) 468 const char *s; 469 { 470 static char buf[256]; 471 char *p = buf, c; 472 const char *q; 473 474 while ((c = *s++) != 0 && buf + sizeof buf - p > 2) { 475 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 476 if (*q++ == c) { 477 *p++ = '\\'; *p++ = *q; 478 goto next; 479 } 480 if (c < 040) { 481 *p++ = '^'; *p++ = c + 'A'-1; 482 } else if (c == 0177) { 483 *p++ = '^'; *p++ = '?'; 484 } else 485 *p++ = c; 486 next: 487 ; 488 } 489 *p = '\0'; 490 return (buf); 491 } 492 493 char * 494 ctrl(c) 495 char c; 496 { 497 static char s[3]; 498 499 if (c < 040 || c == 0177) { 500 s[0] = '^'; 501 s[1] = c == 0177 ? '?' : c+'A'-1; 502 s[2] = '\0'; 503 } else { 504 s[0] = c; 505 s[1] = '\0'; 506 } 507 return (s); 508 } 509 510 /* 511 * Help command 512 */ 513 void 514 help(c) 515 char c; 516 { 517 esctable_t *p; 518 519 printf("%c\r\n", c); 520 for (p = etable; p->e_char; p++) { 521 if ((p->e_flags&PRIV) && uid) 522 continue; 523 printf("%2s", ctrl(character(value(ESCAPE)))); 524 printf("%-2s %c %s\r\n", ctrl(p->e_char), 525 p->e_flags&EXP ? '*': ' ', p->e_help); 526 } 527 } 528 529 /* 530 * Set up the "remote" tty's state 531 */ 532 int 533 ttysetup(spd) 534 int spd; 535 { 536 struct termios cntrl; 537 538 tcgetattr(FD, &cntrl); 539 cfsetospeed(&cntrl, spd); 540 cfsetispeed(&cntrl, spd); 541 cntrl.c_cflag &= ~(CSIZE|PARENB); 542 cntrl.c_cflag |= CS8; 543 if (DC) 544 cntrl.c_cflag |= CLOCAL; 545 if (boolean(value(HARDWAREFLOW))) 546 cntrl.c_cflag |= CRTSCTS; 547 cntrl.c_iflag &= ~(ISTRIP|ICRNL); 548 cntrl.c_oflag &= ~OPOST; 549 cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO); 550 cntrl.c_cc[VMIN] = 1; 551 cntrl.c_cc[VTIME] = 0; 552 if (boolean(value(TAND))) 553 cntrl.c_iflag |= IXOFF; 554 return(tcsetattr(FD, TCSAFLUSH, &cntrl)); 555 } 556 557 static char partab[0200]; 558 559 /* 560 * Do a write to the remote machine with the correct parity. 561 * We are doing 8 bit wide output, so we just generate a character 562 * with the right parity and output it. 563 */ 564 void 565 xpwrite(fd, buf, n) 566 int fd; 567 char *buf; 568 int n; 569 { 570 int i; 571 char *bp; 572 573 bp = buf; 574 if (bits8 == 0) 575 for (i = 0; i < n; i++) { 576 *bp = partab[(*bp) & 0177]; 577 bp++; 578 } 579 if (write(fd, buf, n) < 0) { 580 if (errno == EIO) 581 tipabort("Lost carrier."); 582 /* this is questionable */ 583 warn("write"); 584 } 585 } 586 587 /* 588 * Build a parity table with appropriate high-order bit. 589 */ 590 void 591 setparity(defparity) 592 const char *defparity; 593 { 594 int i, flip, clr, set; 595 const char *parity; 596 static char *curpar; 597 598 if (value(PARITY) == NULL || (value(PARITY))[0] == '\0') { 599 if (curpar != NULL) 600 free(curpar); 601 value(PARITY) = curpar = strdup(defparity); 602 } 603 parity = value(PARITY); 604 if (equal(parity, "none")) { 605 bits8 = 1; 606 return; 607 } 608 bits8 = 0; 609 flip = 0; 610 clr = 0377; 611 set = 0; 612 if (equal(parity, "odd")) 613 flip = 0200; /* reverse bit 7 */ 614 else if (equal(parity, "zero")) 615 clr = 0177; /* turn off bit 7 */ 616 else if (equal(parity, "one")) 617 set = 0200; /* turn on bit 7 */ 618 else if (!equal(parity, "even")) { 619 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 620 (void) fflush(stderr); 621 } 622 for (i = 0; i < 0200; i++) 623 partab[i] = ((evenpartab[i] ^ flip) | set) & clr; 624 } 625
Indexes created Wed Sep 24 15:09:51 GMT 2025