1 /* $NetBSD: main.c,v 1.41 2001/11/10 17:35:54 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 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 #include <sys/cdefs.h> 37 38 #ifndef lint 39 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"); 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "from: @(#)main.c 8.1 (Berkeley) 6/20/93"; 46 #else 47 __RCSID("$NetBSD: main.c,v 1.41 2001/11/10 17:35:54 thorpej Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 #include <termios.h> 54 #include <sys/ioctl.h> 55 #include <sys/resource.h> 56 #include <sys/utsname.h> 57 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <time.h> 61 #include <ctype.h> 62 #include <fcntl.h> 63 #include <pwd.h> 64 #include <setjmp.h> 65 #include <signal.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include <time.h> 70 #include <unistd.h> 71 #include <util.h> 72 #include <limits.h> 73 #include <ttyent.h> 74 #include <termcap.h> 75 76 #include "gettytab.h" 77 #include "pathnames.h" 78 #include "extern.h" 79 80 extern char **environ; 81 extern char editedhost[]; 82 83 /* 84 * Set the amount of running time that getty should accumulate 85 * before deciding that something is wrong and exit. 86 */ 87 #define GETTY_TIMEOUT 60 /* seconds */ 88 89 /* defines for auto detection of incoming PPP calls (->PAP/CHAP) */ 90 91 #define PPP_FRAME 0x7e /* PPP Framing character */ 92 #define PPP_STATION 0xff /* "All Station" character */ 93 #define PPP_ESCAPE 0x7d /* Escape Character */ 94 #define PPP_CONTROL 0x03 /* PPP Control Field */ 95 #define PPP_CONTROL_ESCAPED 0x23 /* PPP Control Field, escaped */ 96 #define PPP_LCP_HI 0xc0 /* LCP protocol - high byte */ 97 #define PPP_LCP_LOW 0x21 /* LCP protocol - low byte */ 98 99 struct termios tmode, omode; 100 101 int crmod, digit, lower, upper; 102 103 char hostname[MAXHOSTNAMELEN + 1]; 104 struct utsname kerninfo; 105 char name[LOGIN_NAME_MAX]; 106 char dev[] = _PATH_DEV; 107 char ttyn[32]; 108 char lockfile[512]; 109 uid_t ttyowner; 110 char *rawttyn; 111 112 #define OBUFSIZ 128 113 #define TABBUFSIZ 512 114 115 char defent[TABBUFSIZ]; 116 char tabent[TABBUFSIZ]; 117 118 char *env[128]; 119 120 const char partab[] = { 121 0001,0201,0201,0001,0201,0001,0001,0201, 122 0202,0004,0003,0205,0005,0206,0201,0001, 123 0201,0001,0001,0201,0001,0201,0201,0001, 124 0001,0201,0201,0001,0201,0001,0001,0201, 125 0200,0000,0000,0200,0000,0200,0200,0000, 126 0000,0200,0200,0000,0200,0000,0000,0200, 127 0000,0200,0200,0000,0200,0000,0000,0200, 128 0200,0000,0000,0200,0000,0200,0200,0000, 129 0200,0000,0000,0200,0000,0200,0200,0000, 130 0000,0200,0200,0000,0200,0000,0000,0200, 131 0000,0200,0200,0000,0200,0000,0000,0200, 132 0200,0000,0000,0200,0000,0200,0200,0000, 133 0000,0200,0200,0000,0200,0000,0000,0200, 134 0200,0000,0000,0200,0000,0200,0200,0000, 135 0200,0000,0000,0200,0000,0200,0200,0000, 136 0000,0200,0200,0000,0200,0000,0000,0201 137 }; 138 139 #define ERASE tmode.c_cc[VERASE] 140 #define KILL tmode.c_cc[VKILL] 141 #define EOT tmode.c_cc[VEOF] 142 143 static void clearscreen(void); 144 145 jmp_buf timeout; 146 147 static void 148 dingdong(int signo) 149 { 150 151 alarm(0); 152 signal(SIGALRM, SIG_DFL); 153 longjmp(timeout, 1); 154 } 155 156 jmp_buf intrupt; 157 158 static void 159 interrupt(int signo) 160 { 161 162 signal(SIGINT, interrupt); 163 longjmp(intrupt, 1); 164 } 165 166 /* 167 * Action to take when getty is running too long. 168 */ 169 static void 170 timeoverrun(int signo) 171 { 172 173 syslog(LOG_ERR, "getty exiting due to excessive running time"); 174 exit(1); 175 } 176 177 int main(int, char *[]); 178 static int getname(void); 179 static void oflush(void); 180 static void prompt(void); 181 static void putchr(int); 182 static void putf(const char *); 183 static void putpad(const char *); 184 static void xputs(const char *); 185 186 int 187 main(int argc, char *argv[]) 188 { 189 const char *progname; 190 char *tname; 191 int repcnt = 0, failopenlogged = 0, uugetty = 0, first_time = 1; 192 struct rlimit limit; 193 struct passwd *pw; 194 int rval; 195 196 #ifdef __GNUC__ 197 (void)&tname; /* XXX gcc -Wall */ 198 #endif 199 200 signal(SIGINT, SIG_IGN); 201 /* 202 signal(SIGQUIT, SIG_DFL); 203 */ 204 openlog("getty", LOG_PID, LOG_AUTH); 205 gethostname(hostname, sizeof(hostname)); 206 hostname[sizeof(hostname) - 1] = '\0'; 207 if (hostname[0] == '\0') 208 strcpy(hostname, "Amnesiac"); 209 uname(&kerninfo); 210 211 progname = getprogname(); 212 if (progname[0] == 'u' && progname[1] == 'u') 213 uugetty = 1; 214 215 /* 216 * Find id of uucp login (if present) so we can chown tty properly. 217 */ 218 if (uugetty && (pw = getpwnam("uucp"))) 219 ttyowner = pw->pw_uid; 220 else 221 ttyowner = 0; 222 223 /* 224 * Limit running time to deal with broken or dead lines. 225 */ 226 (void)signal(SIGXCPU, timeoverrun); 227 limit.rlim_max = RLIM_INFINITY; 228 limit.rlim_cur = GETTY_TIMEOUT; 229 (void)setrlimit(RLIMIT_CPU, &limit); 230 231 /* 232 * The following is a work around for vhangup interactions 233 * which cause great problems getting window systems started. 234 * If the tty line is "-", we do the old style getty presuming 235 * that the file descriptors are already set up for us. 236 * J. Gettys - MIT Project Athena. 237 */ 238 if (argc <= 2 || strcmp(argv[2], "-") == 0) { 239 strlcpy(ttyn, ttyname(0), sizeof(ttyn)); 240 } 241 else { 242 int i; 243 244 rawttyn = argv[2]; 245 strlcpy(ttyn, dev, sizeof(ttyn)); 246 strlcat(ttyn, argv[2], sizeof(ttyn)); 247 248 if (uugetty) { 249 chown(ttyn, ttyowner, 0); 250 strcpy(lockfile, _PATH_LOCK); 251 strlcat(lockfile, argv[2], sizeof(lockfile)); 252 /* wait for lockfiles to go away before we try to open */ 253 if ( pidlock(lockfile, 0, 0, 0) != 0 ) { 254 syslog(LOG_ERR, "%s: can't create lockfile", ttyn); 255 exit(1); 256 } 257 unlink(lockfile); 258 } 259 if (strcmp(argv[0], "+") != 0) { 260 chown(ttyn, ttyowner, 0); 261 chmod(ttyn, 0600); 262 revoke(ttyn); 263 if (ttyaction(ttyn, "getty", "root")) 264 syslog(LOG_WARNING, "%s: ttyaction failed", ttyn); 265 /* 266 * Delay the open so DTR stays down long enough to be detected. 267 */ 268 sleep(2); 269 while ((i = open(ttyn, O_RDWR)) == -1) { 270 if ((repcnt % 10 == 0) && 271 (errno != ENXIO || !failopenlogged)) { 272 syslog(LOG_WARNING, "%s: %m", ttyn); 273 closelog(); 274 failopenlogged = 1; 275 } 276 repcnt++; 277 sleep(60); 278 } 279 if (uugetty && pidlock(lockfile, 0, 0, 0) != 0) { 280 syslog(LOG_ERR, "%s: can't create lockfile", ttyn); 281 exit(1); 282 } 283 (void) chown(lockfile, ttyowner, 0); 284 login_tty(i); 285 } 286 } 287 288 /* Start with default tty settings */ 289 if (tcgetattr(0, &tmode) < 0) { 290 syslog(LOG_ERR, "%s: %m", ttyn); 291 exit(1); 292 } 293 omode = tmode; 294 295 gettable("default", defent); 296 gendefaults(); 297 tname = "default"; 298 if (argc > 1) 299 tname = argv[1]; 300 for (;;) { 301 int off; 302 303 gettable(tname, tabent); 304 if (OPset || EPset || APset) 305 APset++, OPset++, EPset++; 306 setdefaults(); 307 off = 0; 308 (void)tcflush(0, TCIOFLUSH); /* clear out the crap */ 309 ioctl(0, FIONBIO, &off); /* turn off non-blocking mode */ 310 ioctl(0, FIOASYNC, &off); /* ditto for async mode */ 311 312 if (IS) 313 cfsetispeed(&tmode, IS); 314 else if (SP) 315 cfsetispeed(&tmode, SP); 316 if (OS) 317 cfsetospeed(&tmode, OS); 318 else if (SP) 319 cfsetospeed(&tmode, SP); 320 setflags(0); 321 setchars(); 322 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 323 syslog(LOG_ERR, "%s: %m", ttyn); 324 exit(1); 325 } 326 if (AB) { 327 tname = autobaud(); 328 continue; 329 } 330 if (PS) { 331 tname = portselector(); 332 continue; 333 } 334 if (CS) 335 clearscreen(); 336 if (CL && *CL) 337 putpad(CL); 338 edithost(HE); 339 340 /* 341 * If this is the first time through this, and an 342 * issue file has been given, then send it. 343 */ 344 if (first_time != 0 && IF != NULL) { 345 char buf[_POSIX2_LINE_MAX]; 346 FILE *fd; 347 348 if ((fd = fopen(IF, "r")) != NULL) { 349 while (fgets(buf, sizeof(buf) - 1, fd) != NULL) 350 putf(buf); 351 fclose(fd); 352 } 353 } 354 first_time = 0; 355 356 if (IM && *IM) 357 putf(IM); 358 oflush(); 359 if (setjmp(timeout)) { 360 tmode.c_ispeed = tmode.c_ospeed = 0; 361 (void)tcsetattr(0, TCSANOW, &tmode); 362 exit(1); 363 } 364 if (TO) { 365 signal(SIGALRM, dingdong); 366 alarm(TO); 367 } 368 if (AL) { 369 const char *p = AL; 370 char *q = name; 371 372 while (*p && q < &name[sizeof name - 1]) { 373 if (isupper(*p)) 374 upper = 1; 375 else if (islower(*p)) 376 lower = 1; 377 else if (isdigit(*p)) 378 digit++; 379 *q++ = *p++; 380 } 381 } else if ((rval = getname()) == 2) { 382 execle(PP, "ppplogin", ttyn, (char *) 0, env); 383 syslog(LOG_ERR, "%s: %m", PP); 384 exit(1); 385 } 386 387 if (rval || AL) { 388 int i; 389 390 oflush(); 391 alarm(0); 392 signal(SIGALRM, SIG_DFL); 393 if (name[0] == '-') { 394 xputs("user names may not start with '-'."); 395 continue; 396 } 397 if (!(upper || lower || digit)) 398 continue; 399 setflags(2); 400 if (crmod) { 401 tmode.c_iflag |= ICRNL; 402 tmode.c_oflag |= ONLCR; 403 } 404 #if XXX 405 if (upper || UC) 406 tmode.sg_flags |= LCASE; 407 if (lower || LC) 408 tmode.sg_flags &= ~LCASE; 409 #endif 410 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 411 syslog(LOG_ERR, "%s: %m", ttyn); 412 exit(1); 413 } 414 signal(SIGINT, SIG_DFL); 415 for (i = 0; environ[i] != (char *)0; i++) 416 env[i] = environ[i]; 417 makeenv(&env[i]); 418 419 limit.rlim_max = RLIM_INFINITY; 420 limit.rlim_cur = RLIM_INFINITY; 421 (void)setrlimit(RLIMIT_CPU, &limit); 422 execle(LO, "login", AL ? "-fp" : "-p", "--", name, 423 (char *)0, env); 424 syslog(LOG_ERR, "%s: %m", LO); 425 exit(1); 426 } 427 alarm(0); 428 signal(SIGALRM, SIG_DFL); 429 signal(SIGINT, SIG_IGN); 430 if (NX && *NX) 431 tname = NX; 432 unlink(lockfile); 433 } 434 } 435 436 static int 437 getname(void) 438 { 439 int c; 440 char *np; 441 unsigned char cs; 442 int ppp_state, ppp_connection; 443 444 /* 445 * Interrupt may happen if we use CBREAK mode 446 */ 447 if (setjmp(intrupt)) { 448 signal(SIGINT, SIG_IGN); 449 return (0); 450 } 451 signal(SIGINT, interrupt); 452 setflags(1); 453 prompt(); 454 if (PF > 0) { 455 oflush(); 456 sleep(PF); 457 PF = 0; 458 } 459 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 460 syslog(LOG_ERR, "%s: %m", ttyn); 461 exit(1); 462 } 463 crmod = digit = lower = upper = 0; 464 ppp_state = ppp_connection = 0; 465 np = name; 466 for (;;) { 467 oflush(); 468 if (read(STDIN_FILENO, &cs, 1) <= 0) 469 exit(0); 470 if ((c = cs&0177) == 0) 471 return (0); 472 473 /* 474 * PPP detection state machine.. 475 * Look for sequences: 476 * PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or 477 * PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC) 478 * See RFC1662. 479 * Derived from code from Michael Hancock <michaelh@cet.co.jp> 480 * and Erik 'PPP' Olson <eriko@wrq.com> 481 */ 482 if (PP && cs == PPP_FRAME) { 483 ppp_state = 1; 484 } else if (ppp_state == 1 && cs == PPP_STATION) { 485 ppp_state = 2; 486 } else if (ppp_state == 2 && cs == PPP_ESCAPE) { 487 ppp_state = 3; 488 } else if ((ppp_state == 2 && cs == PPP_CONTROL) || 489 (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) { 490 ppp_state = 4; 491 } else if (ppp_state == 4 && cs == PPP_LCP_HI) { 492 ppp_state = 5; 493 } else if (ppp_state == 5 && cs == PPP_LCP_LOW) { 494 ppp_connection = 1; 495 break; 496 } else { 497 ppp_state = 0; 498 } 499 500 if (c == EOT) 501 exit(1); 502 if (c == '\r' || c == '\n' || 503 np >= &name[LOGIN_NAME_MAX - 1]) { 504 *np = '\0'; 505 putf("\r\n"); 506 break; 507 } 508 if (islower(c)) 509 lower = 1; 510 else if (isupper(c)) 511 upper = 1; 512 else if (c == ERASE || c == '#' || c == '\b') { 513 if (np > name) { 514 np--; 515 if (cfgetospeed(&tmode) >= 1200) 516 xputs("\b \b"); 517 else 518 putchr(cs); 519 } 520 continue; 521 } else if (c == KILL || c == '@') { 522 putchr(cs); 523 putchr('\r'); 524 if (cfgetospeed(&tmode) < 1200) 525 putchr('\n'); 526 /* this is the way they do it down under ... */ 527 else if (np > name) 528 xputs( 529 " \r"); 530 prompt(); 531 np = name; 532 continue; 533 } else if (isdigit(c)) 534 digit++; 535 if (IG && (c <= ' ' || c > 0176)) 536 continue; 537 *np++ = c; 538 putchr(cs); 539 } 540 signal(SIGINT, SIG_IGN); 541 *np = 0; 542 if (c == '\r') 543 crmod = 1; 544 if ((upper && !lower && !LC) || UC) 545 for (np = name; *np; np++) 546 if (isupper(*np)) 547 *np = tolower(*np); 548 return (1 + ppp_connection); 549 } 550 551 static void 552 putpad(const char *s) 553 { 554 int pad = 0; 555 speed_t ospeed = cfgetospeed(&tmode); 556 557 if (isdigit(*s)) { 558 while (isdigit(*s)) { 559 pad *= 10; 560 pad += *s++ - '0'; 561 } 562 pad *= 10; 563 if (*s == '.' && isdigit(s[1])) { 564 pad += s[1] - '0'; 565 s += 2; 566 } 567 } 568 569 xputs(s); 570 /* 571 * If no delay needed, or output speed is 572 * not comprehensible, then don't try to delay. 573 */ 574 if (pad == 0 || ospeed <= 0) 575 return; 576 577 /* 578 * Round up by a half a character frame, and then do the delay. 579 * Too bad there are no user program accessible programmed delays. 580 * Transmitting pad characters slows many terminals down and also 581 * loads the system. 582 */ 583 pad = (pad * ospeed + 50000) / 100000; 584 while (pad--) 585 putchr(*PC); 586 } 587 588 static void 589 xputs(const char *s) 590 { 591 while (*s) 592 putchr(*s++); 593 } 594 595 char outbuf[OBUFSIZ]; 596 int obufcnt = 0; 597 598 static void 599 putchr(int cc) 600 { 601 char c; 602 603 c = cc; 604 if (!NP) { 605 c |= partab[c&0177] & 0200; 606 if (OP) 607 c ^= 0200; 608 } 609 if (!UB) { 610 outbuf[obufcnt++] = c; 611 if (obufcnt >= OBUFSIZ) 612 oflush(); 613 } else 614 write(STDOUT_FILENO, &c, 1); 615 } 616 617 static void 618 oflush(void) 619 { 620 if (obufcnt) 621 write(STDOUT_FILENO, outbuf, obufcnt); 622 obufcnt = 0; 623 } 624 625 static void 626 prompt(void) 627 { 628 629 putf(LM); 630 if (CO) 631 putchr('\n'); 632 } 633 634 static void 635 putf(const char *cp) 636 { 637 time_t t; 638 char *slash, db[100]; 639 640 while (*cp) { 641 if (*cp != '%') { 642 putchr(*cp++); 643 continue; 644 } 645 switch (*++cp) { 646 647 case 't': 648 slash = strrchr(ttyn, '/'); 649 if (slash == NULL) 650 xputs(ttyn); 651 else 652 xputs(&slash[1]); 653 break; 654 655 case 'h': 656 xputs(editedhost); 657 break; 658 659 case 'd': 660 (void)time(&t); 661 (void)strftime(db, sizeof(db), 662 /* SCCS eats %M% */ 663 "%l:%M" "%p on %A, %d %B %Y", localtime(&t)); 664 xputs(db); 665 break; 666 667 case 's': 668 xputs(kerninfo.sysname); 669 break; 670 671 case 'm': 672 xputs(kerninfo.machine); 673 break; 674 675 case 'r': 676 xputs(kerninfo.release); 677 break; 678 679 case 'v': 680 xputs(kerninfo.version); 681 break; 682 683 case '%': 684 putchr('%'); 685 break; 686 } 687 if (*cp) 688 cp++; 689 } 690 } 691 692 static void 693 clearscreen(void) 694 { 695 struct ttyent *typ; 696 struct tinfo *tinfo; 697 char *cs; 698 699 if (rawttyn == NULL) 700 return; 701 702 typ = getttynam(rawttyn); 703 704 if ((typ == NULL) || (typ->ty_type == NULL) || 705 (typ->ty_type[0] == 0)) 706 return; 707 708 if (t_getent(&tinfo, typ->ty_type) <= 0) 709 return; 710 711 cs = t_agetstr(tinfo, "cl"); 712 if (cs == NULL) 713 return; 714 715 putpad(cs); 716 } 717