1 /*- 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1980, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)main.c 8.1 (Berkeley) 6/20/93";*/ 42 static char rcsid[] = "$FreeBSD$"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/ioctl.h> 48 #include <sys/resource.h> 49 #include <sys/ttydefaults.h> 50 #include <sys/utsname.h> 51 #include <errno.h> 52 #include <signal.h> 53 #include <fcntl.h> 54 #include <time.h> 55 #include <ctype.h> 56 #include <fcntl.h> 57 #include <libutil.h> 58 #include <locale.h> 59 #include <setjmp.h> 60 #include <signal.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <syslog.h> 64 #include <termios.h> 65 #include <time.h> 66 #include <unistd.h> 67 68 #include "gettytab.h" 69 #include "pathnames.h" 70 #include "extern.h" 71 72 /* 73 * Set the amount of running time that getty should accumulate 74 * before deciding that something is wrong and exit. 75 */ 76 #define GETTY_TIMEOUT 60 /* seconds */ 77 78 #undef CTRL 79 #define CTRL(x) (x&037) 80 81 /* defines for auto detection of incoming PPP calls (->PAP/CHAP) */ 82 83 #define PPP_FRAME 0x7e /* PPP Framing character */ 84 #define PPP_STATION 0xff /* "All Station" character */ 85 #define PPP_ESCAPE 0x7d /* Escape Character */ 86 #define PPP_CONTROL 0x03 /* PPP Control Field */ 87 #define PPP_CONTROL_ESCAPED 0x23 /* PPP Control Field, escaped */ 88 #define PPP_LCP_HI 0xc0 /* LCP protocol - high byte */ 89 #define PPP_LCP_LOW 0x21 /* LCP protocol - low byte */ 90 91 struct termios tmode, omode; 92 93 int crmod, digit, lower, upper; 94 95 char hostname[MAXHOSTNAMELEN]; 96 char name[MAXLOGNAME*3]; 97 char dev[] = _PATH_DEV; 98 char ttyn[32]; 99 100 #define OBUFSIZ 128 101 #define TABBUFSIZ 512 102 103 char defent[TABBUFSIZ]; 104 char tabent[TABBUFSIZ]; 105 106 char *env[128]; 107 108 char partab[] = { 109 0001,0201,0201,0001,0201,0001,0001,0201, 110 0202,0004,0003,0205,0005,0206,0201,0001, 111 0201,0001,0001,0201,0001,0201,0201,0001, 112 0001,0201,0201,0001,0201,0001,0001,0201, 113 0200,0000,0000,0200,0000,0200,0200,0000, 114 0000,0200,0200,0000,0200,0000,0000,0200, 115 0000,0200,0200,0000,0200,0000,0000,0200, 116 0200,0000,0000,0200,0000,0200,0200,0000, 117 0200,0000,0000,0200,0000,0200,0200,0000, 118 0000,0200,0200,0000,0200,0000,0000,0200, 119 0000,0200,0200,0000,0200,0000,0000,0200, 120 0200,0000,0000,0200,0000,0200,0200,0000, 121 0000,0200,0200,0000,0200,0000,0000,0200, 122 0200,0000,0000,0200,0000,0200,0200,0000, 123 0200,0000,0000,0200,0000,0200,0200,0000, 124 0000,0200,0200,0000,0200,0000,0000,0201 125 }; 126 127 #define ERASE tmode.c_cc[VERASE] 128 #define KILL tmode.c_cc[VKILL] 129 #define EOT tmode.c_cc[VEOF] 130 131 static void dingdong __P((int)); 132 static int getname __P((void)); 133 static void interrupt __P((int)); 134 static void oflush __P((void)); 135 static void prompt __P((void)); 136 static void putchr __P((int)); 137 static void putf __P((const char *)); 138 static void putpad __P((const char *)); 139 static void puts __P((const char *)); 140 static void timeoverrun __P((int)); 141 static char *getline __P((int)); 142 static void setttymode __P((const char *, int)); 143 static void setdefttymode __P((const char *)); 144 static int opentty __P((const char *, int)); 145 146 int main __P((int, char **)); 147 148 jmp_buf timeout; 149 150 static void 151 dingdong(signo) 152 int signo; 153 { 154 alarm(0); 155 longjmp(timeout, 1); 156 } 157 158 jmp_buf intrupt; 159 160 static void 161 interrupt(signo) 162 int signo; 163 { 164 longjmp(intrupt, 1); 165 } 166 167 /* 168 * Action to take when getty is running too long. 169 */ 170 static void 171 timeoverrun(signo) 172 int signo; 173 { 174 175 syslog(LOG_ERR, "getty exiting due to excessive running time\n"); 176 exit(1); 177 } 178 179 int 180 main(argc, argv) 181 int argc; 182 char **argv; 183 { 184 extern char **environ; 185 const char *tname; 186 int repcnt = 0, failopenlogged = 0; 187 int first_sleep = 1, first_time = 1; 188 struct rlimit limit; 189 int rval; 190 191 signal(SIGINT, SIG_IGN); 192 signal(SIGQUIT, SIG_IGN); 193 194 openlog("getty", LOG_ODELAY|LOG_CONS|LOG_PID, LOG_AUTH); 195 gethostname(hostname, sizeof(hostname)); 196 if (hostname[0] == '\0') 197 strcpy(hostname, "Amnesiac"); 198 199 /* 200 * Limit running time to deal with broken or dead lines. 201 */ 202 (void)signal(SIGXCPU, timeoverrun); 203 limit.rlim_max = RLIM_INFINITY; 204 limit.rlim_cur = GETTY_TIMEOUT; 205 (void)setrlimit(RLIMIT_CPU, &limit); 206 207 gettable("default", defent); 208 gendefaults(); 209 tname = "default"; 210 if (argc > 1) 211 tname = argv[1]; 212 213 /* 214 * The following is a work around for vhangup interactions 215 * which cause great problems getting window systems started. 216 * If the tty line is "-", we do the old style getty presuming 217 * that the file descriptors are already set up for us. 218 * J. Gettys - MIT Project Athena. 219 */ 220 if (argc <= 2 || strcmp(argv[2], "-") == 0) 221 strcpy(ttyn, ttyname(STDIN_FILENO)); 222 else { 223 int i; 224 225 strcpy(ttyn, dev); 226 strncat(ttyn, argv[2], sizeof(ttyn)-sizeof(dev)); 227 if (strcmp(argv[0], "+") != 0) { 228 chown(ttyn, 0, 0); 229 chmod(ttyn, 0600); 230 revoke(ttyn); 231 232 gettable(tname, tabent); 233 234 /* Init modem sequence has been specified 235 */ 236 if (IC) { 237 if (!opentty(ttyn, O_RDWR|O_NONBLOCK)) 238 exit(1); 239 setdefttymode(tname); 240 if (getty_chat(IC, CT, DC) > 0) { 241 syslog(LOG_ERR, "modem init problem on %s", ttyn); 242 (void)tcsetattr(STDIN_FILENO, TCSANOW, &tmode); 243 exit(1); 244 } 245 } 246 247 if (AC) { 248 int i, rfds; 249 struct timeval timeout; 250 251 if (!opentty(ttyn, O_RDWR|O_NONBLOCK)) 252 exit(1); 253 setdefttymode(tname); 254 rfds = 1 << 0; /* FD_SET */ 255 timeout.tv_sec = RT; 256 timeout.tv_usec = 0; 257 i = select(32, (fd_set*)&rfds, (fd_set*)NULL, 258 (fd_set*)NULL, RT ? &timeout : NULL); 259 if (i < 0) { 260 syslog(LOG_ERR, "select %s: %m", ttyn); 261 } else if (i == 0) { 262 syslog(LOG_NOTICE, "recycle tty %s", ttyn); 263 (void)tcsetattr(STDIN_FILENO, TCSANOW, &tmode); 264 exit(0); /* recycle for init */ 265 } 266 i = getty_chat(AC, CT, DC); 267 if (i > 0) { 268 syslog(LOG_ERR, "modem answer problem on %s", ttyn); 269 (void)tcsetattr(STDIN_FILENO, TCSANOW, &tmode); 270 exit(1); 271 } 272 } else { /* blocking open */ 273 if (!opentty(ttyn, O_RDWR)) 274 exit(1); 275 } 276 } 277 } 278 279 /* Start with default tty settings */ 280 if (tcgetattr(STDIN_FILENO, &tmode) < 0) { 281 syslog(LOG_ERR, "tcgetattr %s: %m", ttyn); 282 exit(1); 283 } 284 /* 285 * Don't rely on the driver too much, and initialize crucial 286 * things according to <sys/ttydefaults.h>. Avoid clobbering 287 * the c_cc[] settings however, the console drivers might wish 288 * to leave their idea of the preferred VERASE key value 289 * there. 290 */ 291 tmode.c_iflag = TTYDEF_IFLAG; 292 tmode.c_oflag = TTYDEF_OFLAG; 293 tmode.c_lflag = TTYDEF_LFLAG; 294 tmode.c_cflag = TTYDEF_CFLAG; 295 omode = tmode; 296 297 for (;;) { 298 299 /* 300 * if a delay was specified then sleep for that 301 * number of seconds before writing the initial prompt 302 */ 303 if (first_sleep && DE) { 304 sleep(DE); 305 /* remove any noise */ 306 (void)tcflush(STDIN_FILENO, TCIOFLUSH); 307 } 308 first_sleep = 0; 309 310 setttymode(tname, 0); 311 if (AB) { 312 tname = autobaud(); 313 continue; 314 } 315 if (PS) { 316 tname = portselector(); 317 continue; 318 } 319 if (CL && *CL) 320 putpad(CL); 321 edithost(HE); 322 323 /* if this is the first time through this, and an 324 issue file has been given, then send it */ 325 if (first_time && IF) { 326 int fd; 327 328 if ((fd = open(IF, O_RDONLY)) != -1) { 329 char * cp; 330 331 while ((cp = getline(fd)) != NULL) { 332 putf(cp); 333 } 334 close(fd); 335 } 336 } 337 first_time = 0; 338 339 if (IM && *IM) 340 putf(IM); 341 if (setjmp(timeout)) { 342 cfsetispeed(&tmode, B0); 343 cfsetospeed(&tmode, B0); 344 (void)tcsetattr(STDIN_FILENO, TCSANOW, &tmode); 345 exit(1); 346 } 347 if (TO) { 348 signal(SIGALRM, dingdong); 349 alarm(TO); 350 } 351 if ((rval = getname()) == 2) { 352 execle(PP, "ppplogin", ttyn, (char *) 0, env); 353 syslog(LOG_ERR, "%s: %m", PP); 354 exit(1); 355 } else if (rval) { 356 register int i; 357 358 oflush(); 359 alarm(0); 360 signal(SIGALRM, SIG_DFL); 361 if (name[0] == '-') { 362 puts("user names may not start with '-'."); 363 continue; 364 } 365 if (!(upper || lower || digit)) 366 continue; 367 setflags(2); 368 if (crmod) { 369 tmode.c_iflag |= ICRNL; 370 tmode.c_oflag |= ONLCR; 371 } 372 #if REALLY_OLD_TTYS 373 if (upper || UC) 374 tmode.sg_flags |= LCASE; 375 if (lower || LC) 376 tmode.sg_flags &= ~LCASE; 377 #endif 378 if (tcsetattr(STDIN_FILENO, TCSANOW, &tmode) < 0) { 379 syslog(LOG_ERR, "tcsetattr %s: %m", ttyn); 380 exit(1); 381 } 382 signal(SIGINT, SIG_DFL); 383 for (i = 0; environ[i] != (char *)0; i++) 384 env[i] = environ[i]; 385 makeenv(&env[i]); 386 387 limit.rlim_max = RLIM_INFINITY; 388 limit.rlim_cur = RLIM_INFINITY; 389 (void)setrlimit(RLIMIT_CPU, &limit); 390 execle(LO, "login", "-p", name, (char *) 0, env); 391 syslog(LOG_ERR, "%s: %m", LO); 392 exit(1); 393 } 394 alarm(0); 395 signal(SIGALRM, SIG_DFL); 396 signal(SIGINT, SIG_IGN); 397 if (NX && *NX) 398 tname = NX; 399 } 400 } 401 402 static int 403 opentty(const char *ttyn, int flags) 404 { 405 int i, j = 0; 406 int failopenlogged = 0; 407 408 while (j < 10 && (i = open(ttyn, flags)) == -1) 409 { 410 if (((j % 10) == 0) && (errno != ENXIO || !failopenlogged)) { 411 syslog(LOG_ERR, "open %s: %m", ttyn); 412 failopenlogged = 1; 413 } 414 j++; 415 sleep(60); 416 } 417 if (i == -1) { 418 syslog(LOG_ERR, "open %s: %m", ttyn); 419 return 0; 420 } 421 else { 422 login_tty(i); 423 return 1; 424 } 425 } 426 427 static void 428 setdefttymode(tname) 429 const char * tname; 430 { 431 if (tcgetattr(STDIN_FILENO, &tmode) < 0) { 432 syslog(LOG_ERR, "tcgetattr %s: %m", ttyn); 433 exit(1); 434 } 435 tmode.c_iflag = TTYDEF_IFLAG; 436 tmode.c_oflag = TTYDEF_OFLAG; 437 tmode.c_lflag = TTYDEF_LFLAG; 438 tmode.c_cflag = TTYDEF_CFLAG; 439 omode = tmode; 440 setttymode(tname, 1); 441 } 442 443 static void 444 setttymode(tname, raw) 445 const char * tname; 446 int raw; 447 { 448 int off = 0; 449 450 gettable(tname, tabent); 451 if (OPset || EPset || APset) 452 APset++, OPset++, EPset++; 453 setdefaults(); 454 (void)tcflush(STDIN_FILENO, TCIOFLUSH); /* clear out the crap */ 455 ioctl(STDIN_FILENO, FIONBIO, &off); /* turn off non-blocking mode */ 456 ioctl(STDIN_FILENO, FIOASYNC, &off); /* ditto for async mode */ 457 458 if (IS) 459 cfsetispeed(&tmode, speed(IS)); 460 else if (SP) 461 cfsetispeed(&tmode, speed(SP)); 462 if (OS) 463 cfsetospeed(&tmode, speed(OS)); 464 else if (SP) 465 cfsetospeed(&tmode, speed(SP)); 466 setflags(0); 467 setchars(); 468 if (raw) 469 cfmakeraw(&tmode); 470 if (tcsetattr(STDIN_FILENO, TCSANOW, &tmode) < 0) { 471 syslog(LOG_ERR, "tcsetattr %s: %m", ttyn); 472 exit(1); 473 } 474 } 475 476 477 static int 478 getname() 479 { 480 register int c; 481 register char *np; 482 unsigned char cs; 483 int ppp_state = 0; 484 int ppp_connection = 0; 485 486 /* 487 * Interrupt may happen if we use CBREAK mode 488 */ 489 if (setjmp(intrupt)) { 490 signal(SIGINT, SIG_IGN); 491 return (0); 492 } 493 signal(SIGINT, interrupt); 494 setflags(1); 495 prompt(); 496 oflush(); 497 if (PF > 0) { 498 sleep(PF); 499 PF = 0; 500 } 501 if (tcsetattr(STDIN_FILENO, TCSANOW, &tmode) < 0) { 502 syslog(LOG_ERR, "%s: %m", ttyn); 503 exit(1); 504 } 505 crmod = digit = lower = upper = 0; 506 np = name; 507 for (;;) { 508 oflush(); 509 if (read(STDIN_FILENO, &cs, 1) <= 0) 510 exit(0); 511 if ((c = cs&0177) == 0) 512 return (0); 513 514 /* PPP detection state machine.. 515 Look for sequences: 516 PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or 517 PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC) 518 See RFC1662. 519 Derived from code from Michael Hancock, <michaelh@cet.co.jp> 520 and Erik 'PPP' Olson, <eriko@wrq.com> 521 */ 522 523 if (PP && (cs == PPP_FRAME)) { 524 ppp_state = 1; 525 } else if (ppp_state == 1 && cs == PPP_STATION) { 526 ppp_state = 2; 527 } else if (ppp_state == 2 && cs == PPP_ESCAPE) { 528 ppp_state = 3; 529 } else if ((ppp_state == 2 && cs == PPP_CONTROL) 530 || (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) { 531 ppp_state = 4; 532 } else if (ppp_state == 4 && cs == PPP_LCP_HI) { 533 ppp_state = 5; 534 } else if (ppp_state == 5 && cs == PPP_LCP_LOW) { 535 ppp_connection = 1; 536 break; 537 } else { 538 ppp_state = 0; 539 } 540 541 if (c == EOT || c == CTRL('d')) 542 exit(1); 543 if (c == '\r' || c == '\n' || np >= &name[sizeof name-1]) { 544 putf("\r\n"); 545 break; 546 } 547 if (islower(c)) 548 lower = 1; 549 else if (isupper(c)) 550 upper = 1; 551 else if (c == ERASE || c == '\b' || c == 0177) { 552 if (np > name) { 553 np--; 554 if (cfgetospeed(&tmode) >= 1200) 555 puts("\b \b"); 556 else 557 putchr(cs); 558 } 559 continue; 560 } else if (c == KILL || c == CTRL('u')) { 561 putchr('\r'); 562 if (cfgetospeed(&tmode) < 1200) 563 putchr('\n'); 564 /* this is the way they do it down under ... */ 565 else if (np > name) 566 puts(" \r"); 567 prompt(); 568 np = name; 569 continue; 570 } else if (isdigit(c)) 571 digit++; 572 if (IG && (c <= ' ' || c > 0176)) 573 continue; 574 *np++ = c; 575 putchr(cs); 576 } 577 signal(SIGINT, SIG_IGN); 578 *np = 0; 579 if (c == '\r') 580 crmod = 1; 581 if ((upper && !lower && !LC) || UC) 582 for (np = name; *np; np++) 583 if (isupper(*np)) 584 *np = tolower(*np); 585 return (1 + ppp_connection); 586 } 587 588 static void 589 putpad(s) 590 register const char *s; 591 { 592 register pad = 0; 593 speed_t ospeed = cfgetospeed(&tmode); 594 595 if (isdigit(*s)) { 596 while (isdigit(*s)) { 597 pad *= 10; 598 pad += *s++ - '0'; 599 } 600 pad *= 10; 601 if (*s == '.' && isdigit(s[1])) { 602 pad += s[1] - '0'; 603 s += 2; 604 } 605 } 606 607 puts(s); 608 /* 609 * If no delay needed, or output speed is 610 * not comprehensible, then don't try to delay. 611 */ 612 if (pad == 0 || ospeed <= 0) 613 return; 614 615 /* 616 * Round up by a half a character frame, and then do the delay. 617 * Too bad there are no user program accessible programmed delays. 618 * Transmitting pad characters slows many terminals down and also 619 * loads the system. 620 */ 621 pad = (pad * ospeed + 50000) / 100000; 622 while (pad--) 623 putchr(*PC); 624 } 625 626 static void 627 puts(s) 628 register const char *s; 629 { 630 while (*s) 631 putchr(*s++); 632 } 633 634 char outbuf[OBUFSIZ]; 635 int obufcnt = 0; 636 637 static void 638 putchr(cc) 639 int cc; 640 { 641 char c; 642 643 c = cc; 644 if (!NP) { 645 c |= partab[c&0177] & 0200; 646 if (OP) 647 c ^= 0200; 648 } 649 if (!UB) { 650 outbuf[obufcnt++] = c; 651 if (obufcnt >= OBUFSIZ) 652 oflush(); 653 } else 654 write(STDOUT_FILENO, &c, 1); 655 } 656 657 static void 658 oflush() 659 { 660 if (obufcnt) 661 write(STDOUT_FILENO, outbuf, obufcnt); 662 obufcnt = 0; 663 } 664 665 static void 666 prompt() 667 { 668 669 putf(LM); 670 if (CO) 671 putchr('\n'); 672 } 673 674 675 static char * 676 getline(fd) 677 int fd; 678 { 679 int i = 0; 680 static char linebuf[512]; 681 682 /* 683 * This is certainly slow, but it avoids having to include 684 * stdio.h unnecessarily. Issue files should be small anyway. 685 */ 686 while (i < (sizeof linebuf - 3) && read(fd, linebuf+i, 1)==1) { 687 if (linebuf[i] == '\n') { 688 /* Don't rely on newline mode, assume raw */ 689 linebuf[i++] = '\r'; 690 linebuf[i++] = '\n'; 691 linebuf[i] = '\0'; 692 return linebuf; 693 } 694 ++i; 695 } 696 linebuf[i] = '\0'; 697 return i ? linebuf : 0; 698 } 699 700 static void 701 putf(cp) 702 register const char *cp; 703 { 704 extern char editedhost[]; 705 time_t t; 706 char *slash, db[100]; 707 708 static struct utsname kerninfo; 709 710 if (!*kerninfo.sysname) 711 uname(&kerninfo); 712 713 while (*cp) { 714 if (*cp != '%') { 715 putchr(*cp++); 716 continue; 717 } 718 switch (*++cp) { 719 720 case 't': 721 slash = strrchr(ttyn, '/'); 722 if (slash == (char *) 0) 723 puts(ttyn); 724 else 725 puts(&slash[1]); 726 break; 727 728 case 'h': 729 puts(editedhost); 730 break; 731 732 case 'd': { 733 t = (time_t)0; 734 (void)time(&t); 735 if (Lo) 736 (void)setlocale(LC_TIME, Lo); 737 (void)strftime(db, sizeof(db), "%+", localtime(&t)); 738 puts(db); 739 break; 740 741 case 's': 742 puts(kerninfo.sysname); 743 break; 744 745 case 'm': 746 puts(kerninfo.machine); 747 break; 748 749 case 'r': 750 puts(kerninfo.release); 751 break; 752 753 case 'v': 754 puts(kerninfo.version); 755 break; 756 } 757 758 case '%': 759 putchr('%'); 760 break; 761 } 762 cp++; 763 } 764 } 765