main.c revision 1.60
1 /* $NetBSD: main.c,v 1.60 2012/11/04 21:14:59 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\ 36 The Regents of the University of California. All rights reserved."); 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 1.60 2012/11/04 21:14:59 christos Exp $"); 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <sys/ioctl.h> 49 #include <sys/resource.h> 50 #include <sys/utsname.h> 51 52 #include <ctype.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <limits.h> 56 #include <pwd.h> 57 #include <setjmp.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <syslog.h> 63 #include <term.h> 64 #include <termios.h> 65 #include <time.h> 66 #include <ttyent.h> 67 #include <unistd.h> 68 #include <util.h> 69 70 #include "gettytab.h" 71 #include "pathnames.h" 72 #include "extern.h" 73 74 extern char editedhost[]; 75 76 /* 77 * Set the amount of running time that getty should accumulate 78 * before deciding that something is wrong and exit. 79 */ 80 #define GETTY_TIMEOUT 60 /* seconds */ 81 82 /* defines for auto detection of incoming PPP calls (->PAP/CHAP) */ 83 84 #define PPP_FRAME 0x7e /* PPP Framing character */ 85 #define PPP_STATION 0xff /* "All Station" character */ 86 #define PPP_ESCAPE 0x7d /* Escape Character */ 87 #define PPP_CONTROL 0x03 /* PPP Control Field */ 88 #define PPP_CONTROL_ESCAPED 0x23 /* PPP Control Field, escaped */ 89 #define PPP_LCP_HI 0xc0 /* LCP protocol - high byte */ 90 #define PPP_LCP_LOW 0x21 /* LCP protocol - low byte */ 91 92 struct termios tmode, omode; 93 94 int crmod, digit_or_punc, lower, upper; 95 96 char hostname[MAXHOSTNAMELEN + 1]; 97 struct utsname kerninfo; 98 char name[LOGIN_NAME_MAX]; 99 char dev[] = _PATH_DEV; 100 char ttyn[32]; 101 char lockfile[512]; 102 uid_t ttyowner; 103 char *rawttyn; 104 105 #define OBUFSIZ 128 106 #define TABBUFSIZ 512 107 108 char defent[TABBUFSIZ]; 109 char tabent[TABBUFSIZ]; 110 111 char *env[128]; 112 113 const unsigned char partab[] = { 114 0001,0201,0201,0001,0201,0001,0001,0201, 115 0202,0004,0003,0205,0005,0206,0201,0001, 116 0201,0001,0001,0201,0001,0201,0201,0001, 117 0001,0201,0201,0001,0201,0001,0001,0201, 118 0200,0000,0000,0200,0000,0200,0200,0000, 119 0000,0200,0200,0000,0200,0000,0000,0200, 120 0000,0200,0200,0000,0200,0000,0000,0200, 121 0200,0000,0000,0200,0000,0200,0200,0000, 122 0200,0000,0000,0200,0000,0200,0200,0000, 123 0000,0200,0200,0000,0200,0000,0000,0200, 124 0000,0200,0200,0000,0200,0000,0000,0200, 125 0200,0000,0000,0200,0000,0200,0200,0000, 126 0000,0200,0200,0000,0200,0000,0000,0200, 127 0200,0000,0000,0200,0000,0200,0200,0000, 128 0200,0000,0000,0200,0000,0200,0200,0000, 129 0000,0200,0200,0000,0200,0000,0000,0201 130 }; 131 132 #define ERASE tmode.c_cc[VERASE] 133 #define KILL tmode.c_cc[VKILL] 134 #define EOT tmode.c_cc[VEOF] 135 136 static void clearscreen(void); 137 138 jmp_buf timeout; 139 140 static void 141 /*ARGSUSED*/ 142 dingdong(int signo) 143 { 144 145 (void)alarm(0); 146 (void)signal(SIGALRM, SIG_DFL); 147 longjmp(timeout, 1); 148 } 149 150 jmp_buf intrupt; 151 152 static void 153 /*ARGSUSED*/ 154 interrupt(int signo) 155 { 156 157 (void)signal(SIGINT, interrupt); 158 longjmp(intrupt, 1); 159 } 160 161 /* 162 * Action to take when getty is running too long. 163 */ 164 static void 165 /*ARGSUSED*/ 166 timeoverrun(int signo) 167 { 168 169 syslog(LOG_ERR, "getty exiting due to excessive running time"); 170 exit(1); 171 } 172 173 static int getname(void); 174 static void oflush(void); 175 static void prompt(void); 176 static int putchr(int); 177 static void putf(const char *); 178 static void xputs(const char *); 179 180 #define putpad(s) tputs(s, 1, putchr) 181 182 int 183 main(int argc, char *argv[], char *envp[]) 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 (void)signal(SIGINT, SIG_IGN); 193 openlog("getty", LOG_PID, LOG_AUTH); 194 (void)gethostname(hostname, sizeof(hostname)); 195 hostname[sizeof(hostname) - 1] = '\0'; 196 if (hostname[0] == '\0') 197 (void)strlcpy(hostname, "Amnesiac", sizeof(hostname)); 198 (void)uname(&kerninfo); 199 200 progname = getprogname(); 201 if (progname[0] == 'u' && progname[1] == 'u') 202 uugetty = 1; 203 204 /* 205 * Find id of uucp login (if present) so we can chown tty properly. 206 */ 207 if (uugetty && (pw = getpwnam("uucp"))) 208 ttyowner = pw->pw_uid; 209 else 210 ttyowner = 0; 211 212 /* 213 * Limit running time to deal with broken or dead lines. 214 */ 215 (void)signal(SIGXCPU, timeoverrun); 216 limit.rlim_max = RLIM_INFINITY; 217 limit.rlim_cur = GETTY_TIMEOUT; 218 (void)setrlimit(RLIMIT_CPU, &limit); 219 220 /* 221 * The following is a work around for vhangup interactions 222 * which cause great problems getting window systems started. 223 * If the tty line is "-", we do the old style getty presuming 224 * that the file descriptors are already set up for us. 225 * J. Gettys - MIT Project Athena. 226 */ 227 if (argc <= 2 || strcmp(argv[2], "-") == 0) { 228 (void)strlcpy(ttyn, ttyname(0), sizeof(ttyn)); 229 } 230 else { 231 int i; 232 233 rawttyn = argv[2]; 234 (void)strlcpy(ttyn, dev, sizeof(ttyn)); 235 (void)strlcat(ttyn, argv[2], sizeof(ttyn)); 236 if (uugetty) { 237 (void)chown(ttyn, ttyowner, 0); 238 (void)strlcpy(lockfile, _PATH_LOCK, 239 sizeof(lockfile)); 240 (void)strlcat(lockfile, argv[2], 241 sizeof(lockfile)); 242 /* 243 * wait for lockfiles to go away before we try 244 * to open 245 */ 246 if (pidlock(lockfile, 0, 0, 0) != 0) { 247 syslog(LOG_ERR, 248 "%s: can't create lockfile", ttyn); 249 exit(1); 250 } 251 (void)unlink(lockfile); 252 } 253 if (strcmp(argv[0], "+") != 0) { 254 (void)chown(ttyn, ttyowner, 0); 255 (void)chmod(ttyn, 0600); 256 (void)revoke(ttyn); 257 if (ttyaction(ttyn, "getty", "root")) 258 syslog(LOG_WARNING, "%s: ttyaction failed", 259 ttyn); 260 /* 261 * Delay the open so DTR stays down long enough 262 * to be detected. 263 */ 264 (void)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 (void)sleep(60); 274 } 275 if (uugetty && pidlock(lockfile, 0, 0, 0) != 0) { 276 syslog(LOG_ERR, "%s: can't create lockfile", 277 ttyn); 278 exit(1); 279 } 280 if (uugetty) 281 (void)chown(lockfile, ttyowner, 0); 282 (void)login_tty(i); 283 } 284 } 285 286 /* Start with default tty settings */ 287 if (tcgetattr(0, &tmode) < 0) { 288 syslog(LOG_ERR, "%s: %m", ttyn); 289 exit(1); 290 } 291 omode = tmode; 292 293 gettable("default", defent); 294 gendefaults(); 295 tname = "default"; 296 if (argc > 1) 297 tname = argv[1]; 298 for (;;) { 299 int off; 300 301 rval = 0; 302 gettable(tname, tabent); 303 if (OPset || EPset || APset) 304 APset++, OPset++, EPset++; 305 setdefaults(); 306 off = 0; 307 (void)tcflush(0, TCIOFLUSH); /* clear out the crap */ 308 (void)ioctl(0, FIONBIO, &off); /* turn off non-blocking mode */ 309 (void)ioctl(0, FIOASYNC, &off); /* ditto for async mode */ 310 311 if (IS) 312 (void)cfsetispeed(&tmode, (speed_t)IS); 313 else if (SP) 314 (void)cfsetispeed(&tmode, (speed_t)SP); 315 if (OS) 316 (void)cfsetospeed(&tmode, (speed_t)OS); 317 else if (SP) 318 (void)cfsetospeed(&tmode, (speed_t)SP); 319 setflags(0); 320 setchars(); 321 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 322 syslog(LOG_ERR, "%s: %m", ttyn); 323 exit(1); 324 } 325 if (AB) { 326 tname = autobaud(); 327 continue; 328 } 329 if (PS) { 330 tname = portselector(); 331 continue; 332 } 333 if (CS) 334 clearscreen(); 335 if (CL && *CL) 336 putpad(CL); 337 edithost(HE); 338 339 /* 340 * If this is the first time through this, and an 341 * issue file has been given, then send it. 342 */ 343 if (first_time != 0 && IF != NULL) { 344 char buf[_POSIX2_LINE_MAX]; 345 FILE *fp; 346 347 if ((fp = fopen(IF, "r")) != NULL) { 348 while (fgets(buf, sizeof(buf) - 1, fp) != NULL) 349 putf(buf); 350 (void)fclose(fp); 351 } 352 } 353 first_time = 0; 354 355 if (IM && *IM) 356 putf(IM); 357 oflush(); 358 if (setjmp(timeout)) { 359 tmode.c_ispeed = tmode.c_ospeed = 0; 360 (void)tcsetattr(0, TCSANOW, &tmode); 361 exit(1); 362 } 363 if (TO) { 364 (void)signal(SIGALRM, dingdong); 365 (void)alarm((unsigned int)TO); 366 } 367 if (NN) { 368 name[0] = '\0'; 369 lower = 1; 370 upper = digit_or_punc = 0; 371 } else if (AL) { 372 const char *p = AL; 373 char *q = name; 374 375 while (*p && q < &name[sizeof name - 1]) { 376 if (isupper((unsigned char)*p)) 377 upper = 1; 378 else if (islower((unsigned char)*p)) 379 lower = 1; 380 else if (isdigit((unsigned char)*p)) 381 digit_or_punc = 1; 382 *q++ = *p++; 383 } 384 } else if ((rval = getname()) == 2) { 385 setflags(2); 386 (void)execle(PP, "ppplogin", ttyn, (char *) 0, env); 387 syslog(LOG_ERR, "%s: %m", PP); 388 exit(1); 389 } 390 391 if (rval || AL || NN) { 392 int i; 393 394 oflush(); 395 (void)alarm(0); 396 (void)signal(SIGALRM, SIG_DFL); 397 if (name[0] == '-') { 398 xputs("user names may not start with '-'."); 399 continue; 400 } 401 if (!(upper || lower || digit_or_punc)) 402 continue; 403 setflags(2); 404 if (crmod) { 405 tmode.c_iflag |= ICRNL; 406 tmode.c_oflag |= ONLCR; 407 } 408 #if XXX 409 if (upper || UC) 410 tmode.sg_flags |= LCASE; 411 if (lower || LC) 412 tmode.sg_flags &= ~LCASE; 413 #endif 414 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 415 syslog(LOG_ERR, "%s: %m", ttyn); 416 exit(1); 417 } 418 (void)signal(SIGINT, SIG_DFL); 419 for (i = 0; envp[i] != NULL; i++) 420 env[i] = envp[i]; 421 makeenv(&env[i]); 422 423 limit.rlim_max = RLIM_INFINITY; 424 limit.rlim_cur = RLIM_INFINITY; 425 (void)setrlimit(RLIMIT_CPU, &limit); 426 if (NN) 427 (void)execle(LO, "login", AL ? "-fp" : "-p", 428 NULL, env); 429 else 430 (void)execle(LO, "login", AL ? "-fp" : "-p", 431 "--", name, NULL, env); 432 syslog(LOG_ERR, "%s: %m", LO); 433 exit(1); 434 } 435 (void)alarm(0); 436 (void)signal(SIGALRM, SIG_DFL); 437 (void)signal(SIGINT, SIG_IGN); 438 if (NX && *NX) 439 tname = NX; 440 if (uugetty) 441 (void)unlink(lockfile); 442 } 443 } 444 445 static int 446 getname(void) 447 { 448 int c; 449 char *np; 450 unsigned char cs; 451 int ppp_state, ppp_connection; 452 453 /* 454 * Interrupt may happen if we use CBREAK mode 455 */ 456 if (setjmp(intrupt)) { 457 (void)signal(SIGINT, SIG_IGN); 458 return (0); 459 } 460 (void)signal(SIGINT, interrupt); 461 setflags(1); 462 prompt(); 463 if (PF > 0) { 464 oflush(); 465 (void)sleep((unsigned int)PF); 466 PF = 0; 467 } 468 if (tcsetattr(0, TCSANOW, &tmode) < 0) { 469 syslog(LOG_ERR, "%s: %m", ttyn); 470 exit(1); 471 } 472 crmod = digit_or_punc = lower = upper = 0; 473 ppp_state = ppp_connection = 0; 474 np = name; 475 for (;;) { 476 oflush(); 477 if (read(STDIN_FILENO, &cs, 1) <= 0) 478 exit(0); 479 if ((c = cs&0177) == 0) 480 return (0); 481 482 /* 483 * PPP detection state machine.. 484 * Look for sequences: 485 * PPP_FRAME, PPP_STATION, PPP_ESCAPE, PPP_CONTROL_ESCAPED or 486 * PPP_FRAME, PPP_STATION, PPP_CONTROL (deviant from RFC) 487 * See RFC1662. 488 * Derived from code from Michael Hancock <michaelh (at) cet.co.jp> 489 * and Erik 'PPP' Olson <eriko (at) wrq.com> 490 */ 491 if (PP && cs == PPP_FRAME) { 492 ppp_state = 1; 493 } else if (ppp_state == 1 && cs == PPP_STATION) { 494 ppp_state = 2; 495 } else if (ppp_state == 2 && cs == PPP_ESCAPE) { 496 ppp_state = 3; 497 } else if ((ppp_state == 2 && cs == PPP_CONTROL) || 498 (ppp_state == 3 && cs == PPP_CONTROL_ESCAPED)) { 499 ppp_state = 4; 500 } else if (ppp_state == 4 && cs == PPP_LCP_HI) { 501 ppp_state = 5; 502 } else if (ppp_state == 5 && cs == PPP_LCP_LOW) { 503 ppp_connection = 1; 504 break; 505 } else { 506 ppp_state = 0; 507 } 508 509 if (c == EOT) 510 exit(1); 511 if (c == '\r' || c == '\n' || 512 np >= &name[LOGIN_NAME_MAX - 1]) { 513 *np = '\0'; 514 putf("\r\n"); 515 break; 516 } 517 if (islower(c)) 518 lower = 1; 519 else if (isupper(c)) 520 upper = 1; 521 else if (c == ERASE || c == '#' || c == '\b') { 522 if (np > name) { 523 np--; 524 if (cfgetospeed(&tmode) >= 1200) 525 xputs("\b \b"); 526 else 527 putchr(cs); 528 } 529 continue; 530 } else if (c == KILL || c == '@') { 531 putchr(cs); 532 putchr('\r'); 533 if (cfgetospeed(&tmode) < 1200) 534 putchr('\n'); 535 /* this is the way they do it down under ... */ 536 else if (np > name) 537 xputs( 538 " \r"); 539 prompt(); 540 np = name; 541 continue; 542 } else if (isdigit(c) || c == '_') 543 digit_or_punc = 1; 544 if (IG && (c <= ' ' || c > 0176)) 545 continue; 546 *np++ = c; 547 putchr(cs); 548 549 /* 550 * An MS-Windows direct connect PPP "client" won't send its 551 * first PPP packet until we respond to its "CLIENT" poll 552 * with a CRLF sequence. We cater to yet another broken 553 * implementation of a previously-standard protocol... 554 */ 555 *np = '\0'; 556 if (strstr(name, "CLIENT")) 557 putf("\r\n"); 558 } 559 (void)signal(SIGINT, SIG_IGN); 560 *np = 0; 561 if (c == '\r') 562 crmod = 1; 563 if ((upper && !lower && !LC) || UC) 564 for (np = name; *np; np++) 565 *np = tolower((unsigned char)*np); 566 return (1 + ppp_connection); 567 } 568 569 static void 570 xputs(const char *s) 571 { 572 while (*s) 573 putchr(*s++); 574 } 575 576 char outbuf[OBUFSIZ]; 577 size_t obufcnt = 0; 578 579 static int 580 putchr(int cc) 581 { 582 unsigned char c; 583 584 c = cc; 585 if (!NP) { 586 c |= partab[c&0177] & 0200; 587 if (OP) 588 c ^= 0200; 589 } 590 if (!UB) { 591 outbuf[obufcnt++] = c; 592 if (obufcnt >= OBUFSIZ) 593 oflush(); 594 return 1; 595 } 596 return write(STDOUT_FILENO, &c, 1); 597 } 598 599 static void 600 oflush(void) 601 { 602 if (obufcnt) 603 (void)write(STDOUT_FILENO, outbuf, obufcnt); 604 obufcnt = 0; 605 } 606 607 static void 608 prompt(void) 609 { 610 611 putf(LM); 612 if (CO) 613 putchr('\n'); 614 } 615 616 static void 617 putf(const char *cp) 618 { 619 time_t t; 620 char *slash, db[100]; 621 622 while (*cp) { 623 if (*cp != '%') { 624 putchr(*cp++); 625 continue; 626 } 627 switch (*++cp) { 628 629 case 't': 630 if ((slash = strstr(ttyn, "/pts/")) == NULL) 631 slash = strrchr(ttyn, '/'); 632 if (slash == NULL) 633 xputs(ttyn); 634 else 635 xputs(&slash[1]); 636 break; 637 638 case 'h': 639 xputs(editedhost); 640 break; 641 642 case 'd': 643 (void)time(&t); 644 (void)strftime(db, sizeof(db), 645 "%l:%M%p on %A, %d %B %Y", localtime(&t)); 646 xputs(db); 647 break; 648 649 case 's': 650 xputs(kerninfo.sysname); 651 break; 652 653 case 'm': 654 xputs(kerninfo.machine); 655 break; 656 657 case 'r': 658 xputs(kerninfo.release); 659 break; 660 661 case 'v': 662 xputs(kerninfo.version); 663 break; 664 665 case '%': 666 putchr('%'); 667 break; 668 } 669 if (*cp) 670 cp++; 671 } 672 } 673 674 static void 675 clearscreen(void) 676 { 677 struct ttyent *typ; 678 int err; 679 680 if (rawttyn == NULL) 681 return; 682 683 typ = getttynam(rawttyn); 684 685 if ((typ == NULL) || (typ->ty_type == NULL) || 686 (typ->ty_type[0] == 0)) 687 return; 688 689 if (setupterm(typ->ty_type, 0, &err) == ERR) 690 return; 691 692 if (clear_screen) 693 putpad(clear_screen); 694 695 del_curterm(cur_term); 696 cur_term = NULL; 697 } 698
Indexes created Fri Oct 03 02:09:57 GMT 2025