1 /* $NetBSD: tip.c,v 1.43 2006/04/03 16:13:34 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 1.43 2006/04/03 16:13:34 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(void); 55 int main(int, char **); 56 void intprompt(int); 57 void tipin(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(int argc, char *argv[]) 65 { 66 char *System = NULL; 67 int i; 68 char *p; 69 const char *q; 70 char sbuf[12]; 71 int fcarg; 72 73 gid = getgid(); 74 egid = getegid(); 75 uid = getuid(); 76 euid = geteuid(); 77 if (equal(basename(argv[0]), "cu")) { 78 cumode = 1; 79 cumain(argc, argv); 80 goto cucommon; 81 } 82 83 if (argc > 4) { 84 fprintf(stderr, "usage: %s [-v] [-speed] [system-name]\n", 85 getprogname()); 86 exit(1); 87 } 88 if (!isatty(0)) { 89 fprintf(stderr, "%s: must be interactive\n", getprogname()); 90 exit(1); 91 } 92 93 for (; argc > 1; argv++, argc--) { 94 if (argv[1][0] != '-') 95 System = argv[1]; 96 else switch (argv[1][1]) { 97 98 case 'v': 99 vflag++; 100 break; 101 102 case '0': case '1': case '2': case '3': case '4': 103 case '5': case '6': case '7': case '8': case '9': 104 BR = atoi(&argv[1][1]); 105 break; 106 107 default: 108 warnx("%s, unknown option", argv[1]); 109 break; 110 } 111 } 112 113 if (System == NULL) 114 goto notnumber; 115 if (isalpha((unsigned char)*System)) 116 goto notnumber; 117 /* 118 * System name is really a phone number... 119 * Copy the number then stomp on the original (in case the number 120 * is private, we don't want 'ps' or 'w' to find it). 121 */ 122 if (strlen(System) > sizeof PNbuf - 1) { 123 errx(1, "phone number too long (max = %d bytes)", 124 (int)sizeof(PNbuf) - 1); 125 } 126 (void)strlcpy(PNbuf, System, sizeof(PNbuf)); 127 for (p = System; *p; p++) 128 *p = '\0'; 129 PN = PNbuf; 130 (void)snprintf(sbuf, sizeof sbuf, "tip%d", (int)BR); 131 System = sbuf; 132 133 notnumber: 134 (void)signal(SIGINT, cleanup); 135 (void)signal(SIGQUIT, cleanup); 136 (void)signal(SIGHUP, cleanup); 137 (void)signal(SIGTERM, cleanup); 138 139 if ((i = hunt(System)) == 0) { 140 printf("all ports busy\n"); 141 exit(3); 142 } 143 if (i == -1) { 144 errx(3, "link down\n"); 145 } 146 setbuf(stdout, NULL); 147 148 /* 149 * Kludge, their's no easy way to get the initialization 150 * in the right order, so force it here 151 */ 152 if ((PH = getenv("PHONES")) == NULL) 153 PH = path_phones; 154 vinit(); /* init variables */ 155 setparity("none"); /* set the parity table */ 156 157 /* 158 * Hardwired connections require the 159 * line speed set before they make any transmissions 160 * (this is particularly true of things like a DF03-AC) 161 */ 162 if (HW) { 163 if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) { 164 errx(3, "bad baud rate %d", 165 (int)number(value(BAUDRATE))); 166 } 167 } 168 if ((q = connect()) != NULL) { 169 errx(1, "\07%s\n[EOT]\n", q); 170 } 171 if (!HW) { 172 if (ttysetup((speed_t)number(value(BAUDRATE))) != 0) { 173 errx(3, "bad baud rate %d", 174 (int)number(value(BAUDRATE))); 175 } 176 } 177 178 179 cucommon: 180 /* 181 * From here down the code is shared with 182 * the "cu" version of tip. 183 */ 184 185 /* 186 * Direct connections with no carrier require using O_NONBLOCK on 187 * open, but we don't want to keep O_NONBLOCK after open because it 188 * will cause busy waits. 189 */ 190 if (DC && 191 ((fcarg = fcntl(FD, F_GETFL, 0)) < 0 || 192 fcntl(FD, F_SETFL, fcarg & ~O_NONBLOCK) < 0)) { 193 err(1, "can't clear O_NONBLOCK"); 194 } 195 196 tcgetattr(0, &defterm); 197 term = defterm; 198 term.c_lflag &= ~(ICANON|IEXTEN|ECHO); 199 term.c_iflag &= ~(INPCK|ICRNL); 200 term.c_oflag &= ~OPOST; 201 term.c_cc[VMIN] = 1; 202 term.c_cc[VTIME] = 0; 203 defchars = term; 204 term.c_cc[VINTR] = term.c_cc[VQUIT] = term.c_cc[VSUSP] = 205 term.c_cc[VDSUSP] = term.c_cc[VDISCARD] = 206 term.c_cc[VLNEXT] = _POSIX_VDISABLE; 207 raw(); 208 209 pipe(attndes); pipe(fildes); pipe(repdes); 210 (void)signal(SIGALRM, alrmtimeout); 211 212 /* 213 * Everything's set up now: 214 * connection established (hardwired or dialup) 215 * line conditioned (baud rate, mode, etc.) 216 * internal data structures (variables) 217 * so, fork one process for local side and one for remote. 218 */ 219 printf("%s", cumode ? "Connected\r\n" : "\07connected\r\n"); 220 switch (pid = fork()) { 221 default: 222 tipin(); 223 break; 224 case 0: 225 tipout(); 226 break; 227 case -1: 228 err(1, "can't fork"); 229 } 230 /*NOTREACHED*/ 231 exit(0); /* XXX: pacify gcc */ 232 } 233 234 void 235 /*ARGSUSED*/ 236 cleanup(int dummy) 237 { 238 239 if (odisc) 240 ioctl(0, TIOCSETD, &odisc); 241 exit(0); 242 } 243 244 /* 245 * put the controlling keyboard into raw mode 246 */ 247 void 248 raw(void) 249 { 250 251 tcsetattr(0, TCSADRAIN, &term); 252 } 253 254 255 /* 256 * return keyboard to normal mode 257 */ 258 void 259 unraw(void) 260 { 261 262 tcsetattr(0, TCSADRAIN, &defterm); 263 } 264 265 static jmp_buf promptbuf; 266 267 /* 268 * Print string ``s'', then read a string 269 * in from the terminal. Handles signals & allows use of 270 * normal erase and kill characters. 271 */ 272 int 273 prompt(const char *s, char *p, size_t l) 274 { 275 int c; 276 char *b = p; 277 sig_t oint, oquit; 278 279 #if __GNUC__ /* XXX: pacify gcc */ 280 (void)&p; 281 #endif 282 283 stoprompt = 0; 284 oint = signal(SIGINT, intprompt); 285 oquit = signal(SIGQUIT, SIG_IGN); 286 unraw(); 287 printf("%s", s); 288 if (setjmp(promptbuf) == 0) 289 while ((c = getchar()) != -1 && (*p = c) != '\n' && 290 b + l > p) 291 p++; 292 *p = '\0'; 293 294 raw(); 295 (void)signal(SIGINT, oint); 296 (void)signal(SIGQUIT, oquit); 297 return (stoprompt || p == b); 298 } 299 300 /* 301 * Interrupt service routine during prompting 302 */ 303 void 304 /*ARGSUSED*/ 305 intprompt(int dummy) 306 { 307 308 (void)signal(SIGINT, SIG_IGN); 309 stoprompt = 1; 310 printf("\r\n"); 311 longjmp(promptbuf, 1); 312 } 313 314 /* 315 * ****TIPIN TIPIN**** 316 */ 317 void 318 tipin(void) 319 { 320 char gch, bol = 1; 321 322 /* 323 * Kinda klugey here... 324 * check for scripting being turned on from the .tiprc file, 325 * but be careful about just using setscript(), as we may 326 * send a SIGEMT before tipout has a chance to set up catching 327 * it; so wait a second, then setscript() 328 */ 329 if (boolean(value(SCRIPT))) { 330 sleep(1); 331 setscript(); 332 } 333 334 for (;;) { 335 gch = getchar()&STRIP_PAR; 336 if ((gch == character(value(ESCAPE))) && bol) { 337 if (!(gch = escape())) 338 continue; 339 } else if (!cumode && 340 gch && gch == character(value(RAISECHAR))) { 341 setboolean(value(RAISE), !boolean(value(RAISE))); 342 continue; 343 } else if (gch == '\r') { 344 bol = 1; 345 xpwrite(FD, &gch, 1); 346 if (boolean(value(HALFDUPLEX))) 347 printf("\r\n"); 348 continue; 349 } else if (!cumode && gch && gch == character(value(FORCE))) 350 gch = getchar()&STRIP_PAR; 351 bol = any(gch, value(EOL)); 352 if (boolean(value(RAISE)) && islower((unsigned char)gch)) 353 gch = toupper((unsigned char)gch); 354 xpwrite(FD, &gch, 1); 355 if (boolean(value(HALFDUPLEX))) 356 printf("%c", gch); 357 } 358 } 359 360 /* 361 * Escape handler -- 362 * called on recognition of ``escapec'' at the beginning of a line 363 */ 364 int 365 escape(void) 366 { 367 char gch; 368 esctable_t *p; 369 char c = character(value(ESCAPE)); 370 371 gch = (getchar()&STRIP_PAR); 372 for (p = etable; p->e_char; p++) 373 if (p->e_char == gch) { 374 if ((p->e_flags&PRIV) && uid) 375 continue; 376 printf("%s", ctrl(c)); 377 (*p->e_func)(gch); 378 return (0); 379 } 380 /* ESCAPE ESCAPE forces ESCAPE */ 381 if (c != gch) 382 xpwrite(FD, &c, 1); 383 return (gch); 384 } 385 386 int 387 any(char c, const char *p) 388 { 389 390 while (p && *p) 391 if (*p++ == c) 392 return (1); 393 return (0); 394 } 395 396 char * 397 interp(const char *s) 398 { 399 static char buf[256]; 400 char *p = buf, c; 401 const char *q; 402 403 while ((c = *s++) != 0 && buf + sizeof buf - p > 2) { 404 for (q = "\nn\rr\tt\ff\033E\bb"; *q; q++) 405 if (*q++ == c) { 406 *p++ = '\\'; *p++ = *q; 407 goto next; 408 } 409 if (c < 040) { 410 *p++ = '^'; *p++ = c + 'A'-1; 411 } else if (c == 0177) { 412 *p++ = '^'; *p++ = '?'; 413 } else 414 *p++ = c; 415 next: 416 ; 417 } 418 *p = '\0'; 419 return (buf); 420 } 421 422 char * 423 ctrl(char c) 424 { 425 static char s[3]; 426 427 if (c < 040 || c == 0177) { 428 s[0] = '^'; 429 s[1] = c == 0177 ? '?' : c+'A'-1; 430 s[2] = '\0'; 431 } else { 432 s[0] = c; 433 s[1] = '\0'; 434 } 435 return (s); 436 } 437 438 /* 439 * Help command 440 */ 441 void 442 help(char c) 443 { 444 esctable_t *p; 445 446 printf("%c\r\n", c); 447 for (p = etable; p->e_char; p++) { 448 if ((p->e_flags&PRIV) && uid) 449 continue; 450 printf("%2s", ctrl(character(value(ESCAPE)))); 451 printf("%-2s %c %s\r\n", ctrl(p->e_char), 452 p->e_flags&EXP ? '*': ' ', p->e_help); 453 } 454 } 455 456 /* 457 * Set up the "remote" tty's state 458 */ 459 int 460 ttysetup(speed_t spd) 461 { 462 struct termios cntrl; 463 464 tcgetattr(FD, &cntrl); 465 cfsetospeed(&cntrl, spd); 466 cfsetispeed(&cntrl, spd); 467 cntrl.c_cflag &= ~(CSIZE|PARENB); 468 cntrl.c_cflag |= CS8; 469 if (DC) 470 cntrl.c_cflag |= CLOCAL; 471 if (boolean(value(HARDWAREFLOW))) 472 cntrl.c_cflag |= CRTSCTS; 473 cntrl.c_iflag &= ~(ISTRIP|ICRNL); 474 cntrl.c_oflag &= ~OPOST; 475 cntrl.c_lflag &= ~(ICANON|ISIG|IEXTEN|ECHO); 476 cntrl.c_cc[VMIN] = 1; 477 cntrl.c_cc[VTIME] = 0; 478 if (boolean(value(TAND))) 479 cntrl.c_iflag |= IXOFF; 480 return(tcsetattr(FD, TCSAFLUSH, &cntrl)); 481 } 482 483 static char partab[0200]; 484 485 /* 486 * Do a write to the remote machine with the correct parity. 487 * We are doing 8 bit wide output, so we just generate a character 488 * with the right parity and output it. 489 */ 490 void 491 xpwrite(int fd, char *buf, size_t n) 492 { 493 int i; 494 char *bp; 495 496 bp = buf; 497 if (bits8 == 0) 498 for (i = 0; i < n; i++) { 499 *bp = partab[(*bp) & 0177]; 500 bp++; 501 } 502 if (write(fd, buf, n) < 0) { 503 if (errno == EIO) 504 tipabort("Lost carrier."); 505 /* this is questionable */ 506 warn("write"); 507 } 508 } 509 510 /* 511 * Build a parity table with appropriate high-order bit. 512 */ 513 void 514 setparity(const char *defparity) 515 { 516 int i, flip, clr, set; 517 const char *parity; 518 static char *curpar; 519 520 if (value(PARITY) == NULL || ((char *)value(PARITY))[0] == '\0') { 521 if (curpar != NULL) 522 free(curpar); 523 value(PARITY) = curpar = strdup(defparity); 524 } 525 parity = value(PARITY); 526 if (equal(parity, "none")) { 527 bits8 = 1; 528 return; 529 } 530 bits8 = 0; 531 flip = 0; 532 clr = 0377; 533 set = 0; 534 if (equal(parity, "odd")) 535 flip = 0200; /* reverse bit 7 */ 536 else if (equal(parity, "zero")) 537 clr = 0177; /* turn off bit 7 */ 538 else if (equal(parity, "one")) 539 set = 0200; /* turn on bit 7 */ 540 else if (!equal(parity, "even")) { 541 (void) fprintf(stderr, "%s: unknown parity value\r\n", parity); 542 (void) fflush(stderr); 543 } 544 for (i = 0; i < 0200; i++) 545 partab[i] = ((evenpartab[i] ^ flip) | set) & clr; 546 } 547