1 /* $NetBSD: main.c,v 1.50 2005/12/28 09:43:05 christos 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. 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 34 #ifndef lint 35 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"); 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "from: @(#)main.c 8.1 (Berkeley) 6/20/93"; 42 #else 43 __RCSID("$NetBSD: main.c,v 1.50 2005/12/28 09:43:05 christos Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <sys/stat.h> 49 #include <termios.h> 50 #include <sys/ioctl.h> 51 #include <sys/resource.h> 52 #include <sys/utsname.h> 53 54 #include <errno.h> 55 #include <fcntl.h> 56 #include <time.h> 57 #include <ctype.h> 58 #include <fcntl.h> 59 #include <pwd.h> 60 #include <setjmp.h> 61 #include <signal.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <syslog.h> 65 #include <time.h> 66 #include <unistd.h> 67 #include <util.h> 68 #include <limits.h> 69 #include <ttyent.h> 70 #include <termcap.h> 71 72 #include "gettytab.h" 73 #include "pathnames.h" 74 #include "extern.h" 75 76 extern char **environ; 77 extern char editedhost[]; 78 79 /* 80 * Set the amount of running time that getty should accumulate 81 * before deciding that something is wrong and exit. 82 */ 83 #define GETTY_TIMEOUT 60 /* seconds */ 84 85 /* defines for auto detection of incoming PPP calls (->PAP/CHAP) */ 86 87 #define PPP_FRAME 0x7e /* PPP Framing character */ 88 #define PPP_STATION 0xff /* "All Station" character */ 89 #define PPP_ESCAPE 0x7d /* Escape Character */ 90 #define PPP_CONTROL 0x03 /* PPP Control Field */ 91 #define PPP_CONTROL_ESCAPED 0x23 /* PPP Control Field, escaped */ 92 #define PPP_LCP_HI 0xc0 /* LCP protocol - high byte */ 93 #define PPP_LCP_LOW 0x21 /* LCP protocol - low byte */ 94 95 struct termios tmode, omode; 96 97 int crmod, digit, lower, upper; 98 99 char hostname[MAXHOSTNAMELEN + 1]; 100 struct utsname kerninfo; 101 char name[LOGIN_NAME_MAX]; 102 char dev[] = _PATH_DEV; 103 char ttyn[32]; 104 char lockfile[512]; 105 uid_t ttyowner; 106 char *rawttyn; 107 108 #define OBUFSIZ 128 109 #define TABBUFSIZ 512 110 111 char defent[TABBUFSIZ]; 112 char tabent[TABBUFSIZ]; 113 114 char *env[128]; 115 116 const char partab[] = { 117 0001,0201,0201,0001,0201,0001,0001,0201, 118 0202,0004,0003,0205,0005,0206,0201,0001, 119 0201,0001,0001,0201,0001,0201,0201,0001, 120 0001,0201,0201,0001,0201,0001,0001,0201, 121 0200,0000,0000,0200,0000,0200,0200,0000, 122 0000,0200,0200,0000,0200,0000,0000,0200, 123 0000,0200,0200,0000,0200,0000,0000,0200, 124 0200,0000,0000,0200,0000,0200,0200,0000, 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 0000,0200,0200,0000,0200,0000,0000,0200, 130 0200,0000,0000,0200,0000,0200,0200,0000, 131 0200,0000,0000,0200,0000,0200,0200,0000, 132 0000,0200,0200,0000,0200,0000,0000,0201 133 }; 134 135 #define ERASE tmode.c_cc[VERASE] 136 #define KILL tmode.c_cc[VKILL] 137 #define EOT tmode.c_cc[VEOF] 138 139 static void clearscreen(void); 140 141 jmp_buf timeout; 142 143 static void 144 dingdong(int signo) 145 { 146 147 alarm(0); 148 signal(SIGALRM, SIG_DFL); 149 longjmp(timeout, 1); 150 } 151 152 jmp_buf intrupt; 153 154 static void 155 interrupt(int signo) 156 { 157 158 signal(SIGINT, interrupt); 159 longjmp(intrupt, 1); 160 } 161 162 /* 163 * Action to take when getty is running too long. 164 */ 165 static void 166 timeoverrun(int signo) 167 { 168 169 syslog(LOG_ERR, "getty exiting due to excessive running time"); 170 exit(1); 171 } 172 173 int main(int, char *[]); 174 static int getname(void); 175 static void oflush(void); 176 static void prompt(void); 177 static void putchr(int); 178 static void putf(const char *); 179 static void putpad(const char *); 180 static void xputs(const char *); 181 182 int 183 main(int argc, char *argv[]) 184 { 185 const char *progname; 186 char *tname; 187 int repcnt = 0, failopenlogged = 0, uugetty = 0, first_time = 1; 188 struct rlimit limit; 189 struct passwd *pw; 190 int rval; 191 192 #ifdef __GNUC__ 193 (void)&tname; /* XXX gcc -Wall */ 194 #endif 195 196 signal(SIGINT, SIG_IGN); 197 /* 198 signal(SIGQUIT, SIG_DFL); 199 */ 200 openlog("getty", LOG_PID, LOG_AUTH); 201 gethostname(hostname, sizeof(hostname)); 202 hostname[sizeof(hostname) - 1] = '\0'; 203 if (hostname[0] == '\0') 204 strlcpy(hostname, "Amnesiac", sizeof(hostname)); 205 uname(&kerninfo); 206 207 progname = getprogname(); 208 if (progname[0] == 'u' && progname[1] == 'u') 209 uugetty = 1; 210 211 /* 212 * Find id of uucp login (if present) so we can chown tty properly. 213 */ 214 if (uugetty && (pw = getpwnam("uucp"))) 215 ttyowner = pw->pw_uid; 216 else 217 ttyowner = 0; 218 219 /* 220 * Limit running time to deal with broken or dead lines. 221 */ 222 (void)signal(SIGXCPU, timeoverrun); 223 limit.rlim_max = RLIM_INFINITY; 224 limit.rlim_cur = GETTY_TIMEOUT; 225 (void)setrlimit(RLIMIT_CPU, &limit); 226 227 /* 228 * The following is a work around for vhangup interactions 229 * which cause great problems getting window systems started. 230 * If the tty line is "-", we do the old style getty presuming 231 * that the file descriptors are already set up for us. 232 * J. Gettys - MIT Project Athena. 233 */ 234 if (argc <= 2 || strcmp(argv[2], "-") == 0) { 235 strlcpy(ttyn, ttyname(0), sizeof(ttyn)); 236 } 237 else { 238 int i; 239 240 rawttyn = argv[2]; 241 strlcpy(ttyn, dev, sizeof(ttyn)); 242 strlcat(ttyn, argv[2], sizeof(ttyn)); 243 244 if (uugetty) { 245 chown(ttyn, ttyowner, 0); 246 strlcpy(lockfile, _PATH_LOCK, sizeof(lockfile)); 247 strlcat(lockfile, argv[2], sizeof(lockfile)); 248 /* wait for lockfiles to go away before we try to open */ 249 if ( pidlock(lockfile, 0, 0, 0) != 0 ) { 250 syslog(LOG_ERR, "%s: can't create lockfile", ttyn); 251 exit(1); 252 } 253 unlink(lockfile); 254 } 255 if (strcmp(argv[0], "+") != 0) { 256 chown(ttyn, ttyowner, 0); 257 chmod(ttyn, 0600); 258 revoke(ttyn); 259 if (ttyaction(ttyn, "getty", "root")) 260 syslog(LOG_WARNING, "%s: ttyaction failed", ttyn); 261 /* 262 * Delay the open so DTR stays down long enough to be detected. 263 */ 264 sleep(2); 265 while ((i = open(ttyn, O_RDWR)) == -1) { 266 if ((repcnt % 10 == 0) && 267 (errno != ENXIO || !failopenlogged)) { 268 syslog(LOG_WARNING, "%s: %m", ttyn); 269 closelog(); 270 failopenlogged = 1; 271 } 272 repcnt++; 273 sleep(60); 274 } 275 if (uugetty && pidlock(lockfile, 0, 0, 0) != 0) { 276 syslog(LOG_ERR, "%s: can't create lockfile", ttyn); 277 exit(1); 278 } 279 if (uugetty) 280 (void) chown(lockfile, ttyowner, 0); 281 login_tty(i); 282 } 283 } 284 285 /* Start with default tty settings */ 286 if (tcgetattr(0, &tmode) < 0) { 287 syslog(LOG_ERR, "%s: %m", ttyn); 288 exit(1); 289 } 290 omode = tmode; 291 292 gettable("default", defent); 293 gendefaults(); 294 tname = "default"; 295 if (argc > 1) 296 tname = argv[1]; 297 for (;;) { 298 int off; 299 300 rval = 0; 301 gettable(tname, tabent); 302 if (OPset || EPset || APset) 303 APset++, OPset++, EPset++; 304 setdefaults(); 305 off = 0; 306 (void)tcflush(0, TCIOFLUSH); /* clear out the crap */ 307 ioctl(0, FIONBIO, &off); /* turn off non-blocking mode */ 308 ioctl(0, FIOASYNC, &off); /* ditto for async mode */ 309 310 if (IS) 311 cfsetispeed(&tmode, IS); 312 else if (SP) 313 cfsetispeed(&tmode, SP); 314 if (OS) 315 cfsetospeed(&tmode, OS); 316 else if (SP) 317 cfsetospeed(&tmode, SP); 318 setflags(0); 319 setchars(); 320 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 321 syslog(LOG_ERR, "%s: %m", ttyn); 322 exit(1); 323 } 324 if (AB) { 325 tname = autobaud(); 326 continue; 327 } 328 if (PS) { 329 tname = portselector(); 330 continue; 331 } 332 if (CS) 333 clearscreen(); 334 if (CL && *CL) 335 putpad(CL); 336 edithost(HE); 337 338 /* 339 * If this is the first time through this, and an 340 * issue file has been given, then send it. 341 */ 342 if (first_time != 0 && IF != NULL) { 343 char buf[_POSIX2_LINE_MAX]; 344 FILE *fd; 345 346 if ((fd = fopen(IF, "r")) != NULL) { 347 while (fgets(buf, sizeof(buf) - 1, fd) != NULL) 348 putf(buf); 349 fclose(fd); 350 } 351 } 352 first_time = 0; 353 354 if (IM && *IM) 355 putf(IM); 356 oflush(); 357 if (setjmp(timeout)) { 358 tmode.c_ispeed = tmode.c_ospeed = 0; 359 (void)tcsetattr(0, TCSANOW, &tmode); 360 exit(1); 361 } 362 if (TO) { 363 signal(SIGALRM, dingdong); 364 alarm(TO); 365 } 366 if (NN) { 367 name[0] = '\0'; 368 lower = 1; 369 upper = digit = 0; 370 } else if (AL) { 371 const char *p = AL; 372 char *q = name; 373 374 while (*p && q < &name[sizeof name - 1]) { 375 if (isupper((unsigned char)*p)) 376 upper = 1; 377 else if (islower((unsigned char)*p)) 378 lower = 1; 379 else if (isdigit((unsigned char)*p)) 380 digit++; 381 *q++ = *p++; 382 } 383 } else if ((rval = getname()) == 2) { 384 setflags(2); 385 execle(PP, "ppplogin", ttyn, (char *) 0, env); 386 syslog(LOG_ERR, "%s: %m", PP); 387 exit(1); 388 } 389 390 if (rval || AL || NN) { 391 int i; 392 393 oflush(); 394 alarm(0); 395 signal(SIGALRM, SIG_DFL); 396 if (name[0] == '-') { 397 xputs("user names may not start with '-'."); 398 continue; 399 } 400 if (!(upper || lower || digit)) 401 continue; 402 setflags(2); 403 if (crmod) { 404 tmode.c_iflag |= ICRNL; 405 tmode.c_oflag |= ONLCR; 406 } 407 #if XXX 408 if (upper || UC) 409 tmode.sg_flags |= LCASE; 410 if (lower || LC) 411 tmode.sg_flags &= ~LCASE; 412 #endif 413 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 414 syslog(LOG_ERR, "%s: %m", ttyn); 415 exit(1); 416 } 417 signal(SIGINT, SIG_DFL); 418 for (i = 0; environ[i] != (char *)0; i++) 419 env[i] = environ[i]; 420 makeenv(&env[i]); 421 422 limit.rlim_max = RLIM_INFINITY; 423 limit.rlim_cur = RLIM_INFINITY; 424 (void)setrlimit(RLIMIT_CPU, &limit); 425 if (NN) 426 execle(LO, "login", AL ? "-fp" : "-p", 427 NULL, env); 428 else 429 execle(LO, "login", AL ? "-fp" : "-p", 430 "--", name, NULL, env); 431 syslog(LOG_ERR, "%s: %m", LO); 432 exit(1); 433 } 434 alarm(0); 435 signal(SIGALRM, SIG_DFL); 436 signal(SIGINT, SIG_IGN); 437 if (NX && *NX) 438 tname = NX; 439 if (uugetty) 440 unlink(lockfile); 441 } 442 } 443 444 static int 445 getname(void) 446 { 447 int c; 448 char *np; 449 unsigned char cs; 450 int ppp_state, ppp_connection; 451 452 /* 453 * Interrupt may happen if we use CBREAK mode 454 */ 455 if (setjmp(intrupt)) { 456 signal(SIGINT, SIG_IGN); 457 return (0); 458 } 459 signal(SIGINT, interrupt); 460 setflags(1); 461 prompt(); 462 if (PF > 0) { 463 oflush(); 464 sleep(PF); 465 PF = 0; 466 } 467 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 468 syslog(LOG_ERR, "%s: %m", ttyn); 469 exit(1); 470 } 471 crmod = digit = lower = upper = 0; 472 ppp_state = ppp_connection = 0; 473 np = name; 474 for (;;) { 475 oflush(); 476 if (read(STDIN_FILENO, &cs, 1) <= 0) 477 exit(0); 478 if ((c = cs&0177) == 0) 479 return (0); 480 481 /* 482 * PPP detection state machine.. 483 * Look for sequences: 484 * PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or 485 * PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC) 486 * See RFC1662. 487 * Derived from code from Michael Hancock <michaelh@cet.co.jp> 488 * and Erik 'PPP' Olson <eriko@wrq.com> 489 */ 490 if (PP && cs == PPP_FRAME) { 491 ppp_state = 1; 492 } else if (ppp_state == 1 && cs == PPP_STATION) { 493 ppp_state = 2; 494 } else if (ppp_state == 2 && cs == PPP_ESCAPE) { 495 ppp_state = 3; 496 } else if ((ppp_state == 2 && cs == PPP_CONTROL) || 497 (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) { 498 ppp_state = 4; 499 } else if (ppp_state == 4 && cs == PPP_LCP_HI) { 500 ppp_state = 5; 501 } else if (ppp_state == 5 && cs == PPP_LCP_LOW) { 502 ppp_connection = 1; 503 break; 504 } else { 505 ppp_state = 0; 506 } 507 508 if (c == EOT) 509 exit(1); 510 if (c == '\r' || c == '\n' || 511 np >= &name[LOGIN_NAME_MAX - 1]) { 512 *np = '\0'; 513 putf("\r\n"); 514 break; 515 } 516 if (islower(c)) 517 lower = 1; 518 else if (isupper(c)) 519 upper = 1; 520 else if (c == ERASE || c == '#' || c == '\b') { 521 if (np > name) { 522 np--; 523 if (cfgetospeed(&tmode) >= 1200) 524 xputs("\b \b"); 525 else 526 putchr(cs); 527 } 528 continue; 529 } else if (c == KILL || c == '@') { 530 putchr(cs); 531 putchr('\r'); 532 if (cfgetospeed(&tmode) < 1200) 533 putchr('\n'); 534 /* this is the way they do it down under ... */ 535 else if (np > name) 536 xputs( 537 " \r"); 538 prompt(); 539 np = name; 540 continue; 541 } else if (isdigit(c)) 542 digit++; 543 if (IG && (c <= ' ' || c > 0176)) 544 continue; 545 *np++ = c; 546 putchr(cs); 547 548 /* 549 * An MS-Windows direct connect PPP "client" won't send its 550 * first PPP packet until we respond to its "CLIENT" poll 551 * with a CRLF sequence. We cater to yet another broken 552 * implementation of a previously-standard protocol... 553 */ 554 *np = '\0'; 555 if (strstr(name, "CLIENT")) 556 putf("\r\n"); 557 } 558 signal(SIGINT, SIG_IGN); 559 *np = 0; 560 if (c == '\r') 561 crmod = 1; 562 if ((upper && !lower && !LC) || UC) 563 for (np = name; *np; np++) 564 *np = tolower((unsigned char)*np); 565 return (1 + ppp_connection); 566 } 567 568 static void 569 putpad(const char *s) 570 { 571 int pad = 0; 572 speed_t ospeed = cfgetospeed(&tmode); 573 574 if (isdigit((unsigned char)*s)) { 575 while (isdigit((unsigned char)*s)) { 576 pad *= 10; 577 pad += *s++ - '0'; 578 } 579 pad *= 10; 580 if (*s == '.' && isdigit((unsigned char)s[1])) { 581 pad += s[1] - '0'; 582 s += 2; 583 } 584 } 585 586 xputs(s); 587 /* 588 * If no delay needed, or output speed is 589 * not comprehensible, then don't try to delay. 590 */ 591 if (pad == 0 || ospeed <= 0) 592 return; 593 594 /* 595 * Round up by a half a character frame, and then do the delay. 596 * Too bad there are no user program accessible programmed delays. 597 * Transmitting pad characters slows many terminals down and also 598 * loads the system. 599 */ 600 pad = (pad * ospeed + 50000) / 100000; 601 while (pad--) 602 putchr(*PC); 603 } 604 605 static void 606 xputs(const char *s) 607 { 608 while (*s) 609 putchr(*s++); 610 } 611 612 char outbuf[OBUFSIZ]; 613 int obufcnt = 0; 614 615 static void 616 putchr(int cc) 617 { 618 char c; 619 620 c = cc; 621 if (!NP) { 622 c |= partab[c&0177] & 0200; 623 if (OP) 624 c ^= 0200; 625 } 626 if (!UB) { 627 outbuf[obufcnt++] = c; 628 if (obufcnt >= OBUFSIZ) 629 oflush(); 630 } else 631 write(STDOUT_FILENO, &c, 1); 632 } 633 634 static void 635 oflush(void) 636 { 637 if (obufcnt) 638 write(STDOUT_FILENO, outbuf, obufcnt); 639 obufcnt = 0; 640 } 641 642 static void 643 prompt(void) 644 { 645 646 putf(LM); 647 if (CO) 648 putchr('\n'); 649 } 650 651 static void 652 putf(const char *cp) 653 { 654 time_t t; 655 char *slash, db[100]; 656 657 while (*cp) { 658 if (*cp != '%') { 659 putchr(*cp++); 660 continue; 661 } 662 switch (*++cp) { 663 664 case 't': 665 if ((slash = strstr(ttyn, "/pts/")) == NULL) 666 slash = strrchr(ttyn, '/'); 667 if (slash == NULL) 668 xputs(ttyn); 669 else 670 xputs(&slash[1]); 671 break; 672 673 case 'h': 674 xputs(editedhost); 675 break; 676 677 case 'd': 678 (void)time(&t); 679 (void)strftime(db, sizeof(db), 680 /* SCCS eats %M% */ 681 "%l:%M" "%p on %A, %d %B %Y", localtime(&t)); 682 xputs(db); 683 break; 684 685 case 's': 686 xputs(kerninfo.sysname); 687 break; 688 689 case 'm': 690 xputs(kerninfo.machine); 691 break; 692 693 case 'r': 694 xputs(kerninfo.release); 695 break; 696 697 case 'v': 698 xputs(kerninfo.version); 699 break; 700 701 case '%': 702 putchr('%'); 703 break; 704 } 705 if (*cp) 706 cp++; 707 } 708 } 709 710 static void 711 clearscreen(void) 712 { 713 struct ttyent *typ; 714 struct tinfo *tinfo; 715 char *cs; 716 717 if (rawttyn == NULL) 718 return; 719 720 typ = getttynam(rawttyn); 721 722 if ((typ == NULL) || (typ->ty_type == NULL) || 723 (typ->ty_type[0] == 0)) 724 return; 725 726 if (t_getent(&tinfo, typ->ty_type) <= 0) 727 return; 728 729 cs = t_agetstr(tinfo, "cl"); 730 if (cs == NULL) 731 return; 732 733 putpad(cs); 734 } 735