1 /* 2 * Copyright (c) 1983, 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #ifndef lint 19 char copyright[] = 20 "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\ 21 All rights reserved.\n"; 22 #endif /* not lint */ 23 24 #ifndef lint 25 static char sccsid[] = "@(#)syslogd.c 5.31 (Berkeley) 04/02/89"; 26 #endif /* not lint */ 27 28 /* 29 * syslogd -- log system messages 30 * 31 * This program implements a system log. It takes a series of lines. 32 * Each line may have a priority, signified as "<n>" as 33 * the first characters of the line. If this is 34 * not present, a default priority is used. 35 * 36 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 37 * cause it to reread its configuration file. 38 * 39 * Defined Constants: 40 * 41 * MAXLINE -- the maximimum line length that can be handled. 42 * DEFUPRI -- the default priority for user messages 43 * DEFSPRI -- the default priority for kernel messages 44 * 45 * Author: Eric Allman 46 * extensive changes by Ralph Campbell 47 * more extensive changes by Eric Allman (again) 48 */ 49 50 #define MAXLINE 1024 /* maximum line length */ 51 #define MAXSVLINE 120 /* maximum saved line length */ 52 #define DEFUPRI (LOG_USER|LOG_NOTICE) 53 #define DEFSPRI (LOG_KERN|LOG_CRIT) 54 #define TIMERINTVL 30 /* interval for checking flush, mark */ 55 56 #include <sys/param.h> 57 #include <sys/syslog.h> 58 #include <sys/errno.h> 59 #include <sys/ioctl.h> 60 #include <sys/stat.h> 61 #include <sys/wait.h> 62 #include <sys/socket.h> 63 #include <sys/file.h> 64 #include <sys/msgbuf.h> 65 #include <sys/uio.h> 66 #include <sys/un.h> 67 #include <sys/time.h> 68 #include <sys/resource.h> 69 #include <sys/signal.h> 70 71 #include <netinet/in.h> 72 #include <netdb.h> 73 74 #include <utmp.h> 75 #include <setjmp.h> 76 #include <stdio.h> 77 #include <ctype.h> 78 #include <strings.h> 79 #include "pathnames.h" 80 81 char *LogName = _PATH_LOG; 82 char *ConfFile = _PATH_LOGCONF; 83 char *PidFile = _PATH_LOGPID; 84 char ctty[] = _PATH_CONSOLE; 85 86 #define FDMASK(fd) (1 << (fd)) 87 88 #define dprintf if (Debug) printf 89 90 #define UNAMESZ 8 /* length of a login name */ 91 #define MAXUNAMES 20 /* maximum number of user names */ 92 #define MAXFNAME 200 /* max file pathname length */ 93 94 #define NOPRI 0x10 /* the "no priority" priority */ 95 #define LOG_MARK LOG_MAKEPRI(LOG_NFACILITIES, 0) /* mark "facility" */ 96 97 /* 98 * Flags to logmsg(). 99 */ 100 101 #define IGN_CONS 0x001 /* don't print on console */ 102 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 103 #define ADDDATE 0x004 /* add a date to the message */ 104 #define MARK 0x008 /* this message is a mark */ 105 106 /* 107 * This structure represents the files that will have log 108 * copies printed. 109 */ 110 111 struct filed { 112 struct filed *f_next; /* next in linked list */ 113 short f_type; /* entry type, see below */ 114 short f_file; /* file descriptor */ 115 time_t f_time; /* time this was last written */ 116 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 117 union { 118 char f_uname[MAXUNAMES][UNAMESZ+1]; 119 struct { 120 char f_hname[MAXHOSTNAMELEN+1]; 121 struct sockaddr_in f_addr; 122 } f_forw; /* forwarding address */ 123 char f_fname[MAXFNAME]; 124 } f_un; 125 char f_prevline[MAXSVLINE]; /* last message logged */ 126 char f_lasttime[16]; /* time of last occurrence */ 127 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 128 int f_prevpri; /* pri of f_prevline */ 129 int f_prevlen; /* length of f_prevline */ 130 int f_prevcount; /* repetition cnt of prevline */ 131 int f_repeatcount; /* number of "repeated" msgs */ 132 }; 133 134 /* 135 * Intervals at which we flush out "message repeated" messages, 136 * in seconds after previous message is logged. After each flush, 137 * we move to the next interval until we reach the largest. 138 */ 139 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 140 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 141 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 142 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 143 (f)->f_repeatcount = MAXREPEAT; \ 144 } 145 146 /* values for f_type */ 147 #define F_UNUSED 0 /* unused entry */ 148 #define F_FILE 1 /* regular file */ 149 #define F_TTY 2 /* terminal */ 150 #define F_CONSOLE 3 /* console terminal */ 151 #define F_FORW 4 /* remote machine */ 152 #define F_USERS 5 /* list of users */ 153 #define F_WALL 6 /* everyone logged on */ 154 155 char *TypeNames[7] = { 156 "UNUSED", "FILE", "TTY", "CONSOLE", 157 "FORW", "USERS", "WALL" 158 }; 159 160 struct filed *Files; 161 struct filed consfile; 162 163 int Debug; /* debug flag */ 164 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 165 char *LocalDomain; /* our local domain name */ 166 int InetInuse = 0; /* non-zero if INET sockets are being used */ 167 int finet; /* Internet datagram socket */ 168 int LogPort; /* port number for INET connections */ 169 int Initialized = 0; /* set when we have initialized ourselves */ 170 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 171 int MarkSeq = 0; /* mark sequence number */ 172 173 extern int errno, sys_nerr; 174 extern char *sys_errlist[]; 175 extern char *ctime(), *index(), *calloc(); 176 177 main(argc, argv) 178 int argc; 179 char **argv; 180 { 181 register int i; 182 register char *p; 183 int funix, inetm, fklog, klogm, len; 184 struct sockaddr_un sunx, fromunix; 185 struct sockaddr_in sin, frominet; 186 FILE *fp; 187 int ch; 188 char line[MSG_BSIZE + 1]; 189 extern int optind, die(), domark(), reapchild(); 190 extern char *optarg; 191 192 while ((ch = getopt(argc, argv, "df:m:p:")) != EOF) 193 switch((char)ch) { 194 case 'd': /* debug */ 195 Debug++; 196 break; 197 case 'f': /* configuration file */ 198 ConfFile = optarg; 199 break; 200 case 'm': /* mark interval */ 201 MarkInterval = atoi(optarg) * 60; 202 break; 203 case 'p': /* path */ 204 LogName = optarg; 205 break; 206 case '?': 207 default: 208 usage(); 209 } 210 if (argc -= optind) 211 usage(); 212 213 if (!Debug) { 214 if (fork()) 215 exit(0); 216 for (i = 0; i < 10; i++) 217 (void) close(i); 218 (void) open("/", 0); 219 (void) dup2(0, 1); 220 (void) dup2(0, 2); 221 untty(); 222 } else 223 setlinebuf(stdout); 224 225 consfile.f_type = F_CONSOLE; 226 (void) strcpy(consfile.f_un.f_fname, ctty); 227 (void) gethostname(LocalHostName, sizeof LocalHostName); 228 if (p = index(LocalHostName, '.')) { 229 *p++ = '\0'; 230 LocalDomain = p; 231 } 232 else 233 LocalDomain = ""; 234 (void) signal(SIGTERM, die); 235 (void) signal(SIGINT, Debug ? die : SIG_IGN); 236 (void) signal(SIGQUIT, Debug ? die : SIG_IGN); 237 (void) signal(SIGCHLD, reapchild); 238 (void) signal(SIGALRM, domark); 239 (void) alarm(TIMERINTVL); 240 (void) unlink(LogName); 241 242 bzero((char *)&sunx, sizeof(sunx)); 243 sunx.sun_family = AF_UNIX; 244 (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); 245 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 246 if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, 247 sizeof(sunx.sun_family)+sizeof(sunx.sun_len)+ 248 strlen(sunx.sun_path)) < 0 || 249 chmod(LogName, 0666) < 0) { 250 (void) sprintf(line, "cannot create %s", LogName); 251 logerror(line); 252 dprintf("cannot create %s (%d)\n", LogName, errno); 253 die(0); 254 } 255 finet = socket(AF_INET, SOCK_DGRAM, 0); 256 if (finet >= 0) { 257 struct servent *sp; 258 259 sp = getservbyname("syslog", "udp"); 260 if (sp == NULL) { 261 errno = 0; 262 logerror("syslog/udp: unknown service"); 263 die(0); 264 } 265 sin.sin_family = AF_INET; 266 sin.sin_port = LogPort = sp->s_port; 267 if (bind(finet, &sin, sizeof(sin)) < 0) { 268 logerror("bind"); 269 if (!Debug) 270 die(0); 271 } else { 272 inetm = FDMASK(finet); 273 InetInuse = 1; 274 } 275 } 276 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 277 klogm = FDMASK(fklog); 278 else { 279 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 280 klogm = 0; 281 } 282 283 /* tuck my process id away */ 284 fp = fopen(PidFile, "w"); 285 if (fp != NULL) { 286 fprintf(fp, "%d\n", getpid()); 287 (void) fclose(fp); 288 } 289 290 dprintf("off & running....\n"); 291 292 init(); 293 (void) signal(SIGHUP, init); 294 295 for (;;) { 296 int nfds, readfds = FDMASK(funix) | inetm | klogm; 297 298 errno = 0; 299 dprintf("readfds = %#x\n", readfds); 300 nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, 301 (fd_set *) NULL, (struct timeval *) NULL); 302 if (nfds == 0) 303 continue; 304 if (nfds < 0) { 305 if (errno != EINTR) 306 logerror("select"); 307 continue; 308 } 309 dprintf("got a message (%d, %#x)\n", nfds, readfds); 310 if (readfds & klogm) { 311 i = read(fklog, line, sizeof(line) - 1); 312 if (i > 0) { 313 line[i] = '\0'; 314 printsys(line); 315 } else if (i < 0 && errno != EINTR) { 316 logerror("klog"); 317 fklog = -1; 318 klogm = 0; 319 } 320 } 321 if (readfds & FDMASK(funix)) { 322 len = sizeof fromunix; 323 i = recvfrom(funix, line, MAXLINE, 0, 324 (struct sockaddr *) &fromunix, &len); 325 if (i > 0) { 326 line[i] = '\0'; 327 printline(LocalHostName, line); 328 } else if (i < 0 && errno != EINTR) 329 logerror("recvfrom unix"); 330 } 331 if (readfds & inetm) { 332 len = sizeof frominet; 333 i = recvfrom(finet, line, MAXLINE, 0, &frominet, &len); 334 if (i > 0) { 335 extern char *cvthname(); 336 337 line[i] = '\0'; 338 printline(cvthname(&frominet), line); 339 } else if (i < 0 && errno != EINTR) 340 logerror("recvfrom inet"); 341 } 342 } 343 } 344 345 usage() 346 { 347 fprintf(stderr, "usage: syslogd [-d] [-m markinterval] [-p path] [-f conffile]\n"); 348 exit(1); 349 } 350 351 untty() 352 { 353 int i; 354 355 if (!Debug) { 356 i = open("/dev/tty", O_RDWR); 357 if (i >= 0) { 358 (void) ioctl(i, (int) TIOCNOTTY, (char *)0); 359 (void) close(i); 360 } 361 } 362 } 363 364 /* 365 * Take a raw input line, decode the message, and print the message 366 * on the appropriate log files. 367 */ 368 369 printline(hname, msg) 370 char *hname; 371 char *msg; 372 { 373 register char *p, *q; 374 register int c; 375 char line[MAXLINE + 1]; 376 int pri; 377 378 /* test for special codes */ 379 pri = DEFUPRI; 380 p = msg; 381 if (*p == '<') { 382 pri = 0; 383 while (isdigit(*++p)) 384 pri = 10 * pri + (*p - '0'); 385 if (*p == '>') 386 ++p; 387 } 388 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 389 pri = DEFUPRI; 390 391 /* don't allow users to log kernel messages */ 392 if (LOG_FAC(pri) == LOG_KERN) 393 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 394 395 q = line; 396 397 while ((c = *p++ & 0177) != '\0' && 398 q < &line[sizeof(line) - 1]) 399 if (iscntrl(c)) 400 if (c == '\n') 401 *q++ = ' '; 402 else if (c == '\t') 403 *q++ = '\t'; 404 else { 405 *q++ = '^'; 406 *q++ = c ^ 0100; 407 } 408 else 409 *q++ = c; 410 *q = '\0'; 411 412 logmsg(pri, line, hname, 0); 413 } 414 415 /* 416 * Take a raw input line from /dev/klog, split and format similar to syslog(). 417 */ 418 419 printsys(msg) 420 char *msg; 421 { 422 register char *p, *q; 423 register int c; 424 char line[MAXLINE + 1]; 425 int pri, flags; 426 char *lp; 427 428 (void) sprintf(line, "vmunix: "); 429 lp = line + strlen(line); 430 for (p = msg; *p != '\0'; ) { 431 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 432 pri = DEFSPRI; 433 if (*p == '<') { 434 pri = 0; 435 while (isdigit(*++p)) 436 pri = 10 * pri + (*p - '0'); 437 if (*p == '>') 438 ++p; 439 } else { 440 /* kernel printf's come out on console */ 441 flags |= IGN_CONS; 442 } 443 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 444 pri = DEFSPRI; 445 q = lp; 446 while (*p != '\0' && (c = *p++) != '\n' && 447 q < &line[MAXLINE]) 448 *q++ = c; 449 *q = '\0'; 450 logmsg(pri, line, LocalHostName, flags); 451 } 452 } 453 454 time_t now; 455 456 /* 457 * Log a message to the appropriate log files, users, etc. based on 458 * the priority. 459 */ 460 461 logmsg(pri, msg, from, flags) 462 int pri; 463 char *msg, *from; 464 int flags; 465 { 466 register struct filed *f; 467 int fac, prilev; 468 int omask, msglen; 469 char *timestamp; 470 471 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", pri, flags, from, msg); 472 473 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 474 475 /* 476 * Check to see if msg looks non-standard. 477 */ 478 msglen = strlen(msg); 479 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 480 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 481 flags |= ADDDATE; 482 483 (void) time(&now); 484 if (flags & ADDDATE) 485 timestamp = ctime(&now) + 4; 486 else { 487 timestamp = msg; 488 msg += 16; 489 msglen -= 16; 490 } 491 492 /* extract facility and priority level */ 493 if (flags & MARK) 494 fac = LOG_NFACILITIES; 495 else 496 fac = LOG_FAC(pri); 497 prilev = LOG_PRI(pri); 498 499 /* log the message to the particular outputs */ 500 if (!Initialized) { 501 f = &consfile; 502 f->f_file = open(ctty, O_WRONLY); 503 504 if (f->f_file >= 0) { 505 untty(); 506 fprintlog(f, flags, msg); 507 (void) close(f->f_file); 508 } 509 (void) sigsetmask(omask); 510 return; 511 } 512 for (f = Files; f; f = f->f_next) { 513 /* skip messages that are incorrect priority */ 514 if (f->f_pmask[fac] < prilev || f->f_pmask[fac] == NOPRI) 515 continue; 516 517 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 518 continue; 519 520 /* don't output marks to recently written files */ 521 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 522 continue; 523 524 /* 525 * suppress duplicate lines to this file 526 */ 527 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 528 !strcmp(msg, f->f_prevline) && 529 !strcmp(from, f->f_prevhost)) { 530 (void) strncpy(f->f_lasttime, timestamp, 15); 531 f->f_prevcount++; 532 dprintf("msg repeated %d times, %ld sec of %d\n", 533 f->f_prevcount, now - f->f_time, 534 repeatinterval[f->f_repeatcount]); 535 /* 536 * If domark would have logged this by now, 537 * flush it now (so we don't hold isolated messages), 538 * but back off so we'll flush less often 539 * in the future. 540 */ 541 if (now > REPEATTIME(f)) { 542 fprintlog(f, flags, (char *)NULL); 543 BACKOFF(f); 544 } 545 } else { 546 /* new line, save it */ 547 if (f->f_prevcount) 548 fprintlog(f, 0, (char *)NULL); 549 f->f_repeatcount = 0; 550 (void) strncpy(f->f_lasttime, timestamp, 15); 551 (void) strncpy(f->f_prevhost, from, 552 sizeof(f->f_prevhost)); 553 if (msglen < MAXSVLINE) { 554 f->f_prevlen = msglen; 555 f->f_prevpri = pri; 556 (void) strcpy(f->f_prevline, msg); 557 fprintlog(f, flags, (char *)NULL); 558 } else { 559 f->f_prevline[0] = 0; 560 f->f_prevlen = 0; 561 fprintlog(f, flags, msg); 562 } 563 } 564 } 565 (void) sigsetmask(omask); 566 } 567 568 fprintlog(f, flags, msg) 569 register struct filed *f; 570 int flags; 571 char *msg; 572 { 573 struct iovec iov[6]; 574 register struct iovec *v = iov; 575 register int l; 576 char line[MAXLINE + 1]; 577 char repbuf[80]; 578 579 v->iov_base = f->f_lasttime; 580 v->iov_len = 15; 581 v++; 582 v->iov_base = " "; 583 v->iov_len = 1; 584 v++; 585 v->iov_base = f->f_prevhost; 586 v->iov_len = strlen(v->iov_base); 587 v++; 588 v->iov_base = " "; 589 v->iov_len = 1; 590 v++; 591 if (msg) { 592 v->iov_base = msg; 593 v->iov_len = strlen(msg); 594 } else if (f->f_prevcount > 1) { 595 (void) sprintf(repbuf, "last message repeated %d times", 596 f->f_prevcount); 597 v->iov_base = repbuf; 598 v->iov_len = strlen(repbuf); 599 } else { 600 v->iov_base = f->f_prevline; 601 v->iov_len = f->f_prevlen; 602 } 603 v++; 604 605 dprintf("Logging to %s", TypeNames[f->f_type]); 606 f->f_time = now; 607 608 switch (f->f_type) { 609 case F_UNUSED: 610 dprintf("\n"); 611 break; 612 613 case F_FORW: 614 dprintf(" %s\n", f->f_un.f_forw.f_hname); 615 (void) sprintf(line, "<%d>%.15s %s", f->f_prevpri, 616 iov[0].iov_base, iov[4].iov_base); 617 l = strlen(line); 618 if (l > MAXLINE) 619 l = MAXLINE; 620 if (sendto(finet, line, l, 0, &f->f_un.f_forw.f_addr, 621 sizeof f->f_un.f_forw.f_addr) != l) { 622 int e = errno; 623 (void) close(f->f_file); 624 f->f_type = F_UNUSED; 625 errno = e; 626 logerror("sendto"); 627 } 628 break; 629 630 case F_CONSOLE: 631 if (flags & IGN_CONS) { 632 dprintf(" (ignored)\n"); 633 break; 634 } 635 /* FALLTHROUGH */ 636 637 case F_TTY: 638 case F_FILE: 639 dprintf(" %s\n", f->f_un.f_fname); 640 if (f->f_type != F_FILE) { 641 v->iov_base = "\r\n"; 642 v->iov_len = 2; 643 } else { 644 v->iov_base = "\n"; 645 v->iov_len = 1; 646 } 647 again: 648 if (writev(f->f_file, iov, 6) < 0) { 649 int e = errno; 650 (void) close(f->f_file); 651 /* 652 * Check for EBADF on TTY's due to vhangup() XXX 653 */ 654 if (e == EBADF && f->f_type != F_FILE) { 655 f->f_file = open(f->f_un.f_fname, O_WRONLY|O_APPEND); 656 if (f->f_file < 0) { 657 f->f_type = F_UNUSED; 658 logerror(f->f_un.f_fname); 659 } else { 660 untty(); 661 goto again; 662 } 663 } else { 664 f->f_type = F_UNUSED; 665 errno = e; 666 logerror(f->f_un.f_fname); 667 } 668 } else if (flags & SYNC_FILE) 669 (void) fsync(f->f_file); 670 break; 671 672 case F_USERS: 673 case F_WALL: 674 dprintf("\n"); 675 v->iov_base = "\r\n"; 676 v->iov_len = 2; 677 wallmsg(f, iov); 678 break; 679 } 680 f->f_prevcount = 0; 681 } 682 683 jmp_buf ttybuf; 684 685 endtty() 686 { 687 longjmp(ttybuf, 1); 688 } 689 690 /* 691 * WALLMSG -- Write a message to the world at large 692 * 693 * Write the specified message to either the entire 694 * world, or a list of approved users. 695 */ 696 697 wallmsg(f, iov) 698 register struct filed *f; 699 struct iovec *iov; 700 { 701 register char *p; 702 register int i; 703 int ttyf, len; 704 FILE *uf; 705 static int reenter = 0; 706 struct utmp ut; 707 char greetings[200]; 708 709 if (reenter++) 710 return; 711 712 /* open the user login file */ 713 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 714 logerror(_PATH_UTMP); 715 reenter = 0; 716 return; 717 } 718 719 /* 720 * Might as well fork instead of using nonblocking I/O 721 * and doing notty(). 722 */ 723 if (fork() == 0) { 724 (void) signal(SIGTERM, SIG_DFL); 725 (void) alarm(0); 726 (void) signal(SIGALRM, endtty); 727 (void) signal(SIGTTOU, SIG_IGN); 728 (void) sigsetmask(0); 729 (void) sprintf(greetings, 730 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 731 iov[2].iov_base, ctime(&now)); 732 len = strlen(greetings); 733 734 /* scan the user login file */ 735 while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { 736 /* is this slot used? */ 737 if (ut.ut_name[0] == '\0') 738 continue; 739 740 /* should we send the message to this user? */ 741 if (f->f_type == F_USERS) { 742 for (i = 0; i < MAXUNAMES; i++) { 743 if (!f->f_un.f_uname[i][0]) { 744 i = MAXUNAMES; 745 break; 746 } 747 if (strncmp(f->f_un.f_uname[i], 748 ut.ut_name, UNAMESZ) == 0) 749 break; 750 } 751 if (i >= MAXUNAMES) 752 continue; 753 } 754 755 /* compute the device name */ 756 p = "/dev/12345678"; 757 strncpy(&p[5], ut.ut_line, UNAMESZ); 758 759 if (f->f_type == F_WALL) { 760 iov[0].iov_base = greetings; 761 iov[0].iov_len = len; 762 iov[1].iov_len = 0; 763 } 764 if (setjmp(ttybuf) == 0) { 765 (void) alarm(15); 766 /* open the terminal */ 767 ttyf = open(p, O_WRONLY); 768 if (ttyf >= 0) { 769 struct stat statb; 770 771 if (fstat(ttyf, &statb) == 0 && 772 (statb.st_mode & S_IWRITE)) 773 (void) writev(ttyf, iov, 6); 774 close(ttyf); 775 ttyf = -1; 776 } 777 } 778 (void) alarm(0); 779 } 780 exit(0); 781 } 782 /* close the user login file */ 783 (void) fclose(uf); 784 reenter = 0; 785 } 786 787 reapchild() 788 { 789 union wait status; 790 791 while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0) 792 ; 793 } 794 795 /* 796 * Return a printable representation of a host address. 797 */ 798 char * 799 cvthname(f) 800 struct sockaddr_in *f; 801 { 802 struct hostent *hp; 803 register char *p; 804 extern char *inet_ntoa(); 805 806 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 807 808 if (f->sin_family != AF_INET) { 809 dprintf("Malformed from address\n"); 810 return ("???"); 811 } 812 hp = gethostbyaddr(&f->sin_addr, sizeof(struct in_addr), f->sin_family); 813 if (hp == 0) { 814 dprintf("Host name for your address (%s) unknown\n", 815 inet_ntoa(f->sin_addr)); 816 return (inet_ntoa(f->sin_addr)); 817 } 818 if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 819 *p = '\0'; 820 return (hp->h_name); 821 } 822 823 domark() 824 { 825 register struct filed *f; 826 827 now = time(0); 828 MarkSeq += TIMERINTVL; 829 if (MarkSeq >= MarkInterval) { 830 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 831 MarkSeq = 0; 832 } 833 834 for (f = Files; f; f = f->f_next) { 835 if (f->f_prevcount && now >= REPEATTIME(f)) { 836 dprintf("flush %s: repeated %d times, %d sec.\n", 837 TypeNames[f->f_type], f->f_prevcount, 838 repeatinterval[f->f_repeatcount]); 839 fprintlog(f, 0, (char *)NULL); 840 BACKOFF(f); 841 } 842 } 843 (void) alarm(TIMERINTVL); 844 } 845 846 /* 847 * Print syslogd errors some place. 848 */ 849 logerror(type) 850 char *type; 851 { 852 char buf[100]; 853 854 if (errno == 0) 855 (void) sprintf(buf, "syslogd: %s", type); 856 else if ((unsigned) errno > sys_nerr) 857 (void) sprintf(buf, "syslogd: %s: error %d", type, errno); 858 else 859 (void) sprintf(buf, "syslogd: %s: %s", type, sys_errlist[errno]); 860 errno = 0; 861 dprintf("%s\n", buf); 862 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 863 } 864 865 die(sig) 866 { 867 register struct filed *f; 868 char buf[100]; 869 870 for (f = Files; f != NULL; f = f->f_next) { 871 /* flush any pending output */ 872 if (f->f_prevcount) 873 fprintlog(f, 0, (char *)NULL); 874 } 875 if (sig) { 876 dprintf("syslogd: exiting on signal %d\n", sig); 877 (void) sprintf(buf, "exiting on signal %d", sig); 878 errno = 0; 879 logerror(buf); 880 } 881 (void) unlink(LogName); 882 exit(0); 883 } 884 885 /* 886 * INIT -- Initialize syslogd from configuration table 887 */ 888 889 init() 890 { 891 register int i; 892 register FILE *cf; 893 register struct filed *f, *next, **nextp; 894 register char *p; 895 char cline[BUFSIZ]; 896 897 dprintf("init\n"); 898 899 /* 900 * Close all open log files. 901 */ 902 Initialized = 0; 903 for (f = Files; f != NULL; f = next) { 904 /* flush any pending output */ 905 if (f->f_prevcount) 906 fprintlog(f, 0, (char *)NULL); 907 908 switch (f->f_type) { 909 case F_FILE: 910 case F_TTY: 911 case F_CONSOLE: 912 case F_FORW: 913 (void) close(f->f_file); 914 break; 915 } 916 next = f->f_next; 917 free((char *) f); 918 } 919 Files = NULL; 920 nextp = &Files; 921 922 /* open the configuration file */ 923 if ((cf = fopen(ConfFile, "r")) == NULL) { 924 dprintf("cannot open %s\n", ConfFile); 925 *nextp = (struct filed *)calloc(1, sizeof(*f)); 926 cfline("*.ERR\t/dev/console", *nextp); 927 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 928 cfline("*.PANIC\t*", (*nextp)->f_next); 929 Initialized = 1; 930 return; 931 } 932 933 /* 934 * Foreach line in the conf table, open that file. 935 */ 936 f = NULL; 937 while (fgets(cline, sizeof cline, cf) != NULL) { 938 /* 939 * check for end-of-section, comments, strip off trailing 940 * spaces and newline character. 941 */ 942 for (p = cline; isspace(*p); ++p); 943 if (*p == NULL || *p == '#') 944 continue; 945 for (p = index(cline, '\0'); isspace(*--p);); 946 *++p = '\0'; 947 f = (struct filed *)calloc(1, sizeof(*f)); 948 *nextp = f; 949 nextp = &f->f_next; 950 cfline(cline, f); 951 } 952 953 /* close the configuration file */ 954 (void) fclose(cf); 955 956 Initialized = 1; 957 958 if (Debug) { 959 for (f = Files; f; f = f->f_next) { 960 for (i = 0; i <= LOG_NFACILITIES; i++) 961 if (f->f_pmask[i] == NOPRI) 962 printf("X "); 963 else 964 printf("%d ", f->f_pmask[i]); 965 printf("%s: ", TypeNames[f->f_type]); 966 switch (f->f_type) { 967 case F_FILE: 968 case F_TTY: 969 case F_CONSOLE: 970 printf("%s", f->f_un.f_fname); 971 break; 972 973 case F_FORW: 974 printf("%s", f->f_un.f_forw.f_hname); 975 break; 976 977 case F_USERS: 978 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 979 printf("%s, ", f->f_un.f_uname[i]); 980 break; 981 } 982 printf("\n"); 983 } 984 } 985 986 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 987 dprintf("syslogd: restarted\n"); 988 } 989 990 /* 991 * Crack a configuration file line 992 */ 993 994 struct code { 995 char *c_name; 996 int c_val; 997 }; 998 999 struct code PriNames[] = { 1000 "panic", LOG_EMERG, 1001 "emerg", LOG_EMERG, 1002 "alert", LOG_ALERT, 1003 "crit", LOG_CRIT, 1004 "err", LOG_ERR, 1005 "error", LOG_ERR, 1006 "warn", LOG_WARNING, 1007 "warning", LOG_WARNING, 1008 "notice", LOG_NOTICE, 1009 "info", LOG_INFO, 1010 "debug", LOG_DEBUG, 1011 "none", NOPRI, 1012 NULL, -1 1013 }; 1014 1015 struct code FacNames[] = { 1016 "kern", LOG_KERN, 1017 "user", LOG_USER, 1018 "mail", LOG_MAIL, 1019 "daemon", LOG_DAEMON, 1020 "auth", LOG_AUTH, 1021 "security", LOG_AUTH, 1022 "mark", LOG_MARK, 1023 "syslog", LOG_SYSLOG, 1024 "lpr", LOG_LPR, 1025 "news", LOG_NEWS, 1026 "uucp", LOG_UUCP, 1027 "local0", LOG_LOCAL0, 1028 "local1", LOG_LOCAL1, 1029 "local2", LOG_LOCAL2, 1030 "local3", LOG_LOCAL3, 1031 "local4", LOG_LOCAL4, 1032 "local5", LOG_LOCAL5, 1033 "local6", LOG_LOCAL6, 1034 "local7", LOG_LOCAL7, 1035 NULL, -1 1036 }; 1037 1038 cfline(line, f) 1039 char *line; 1040 register struct filed *f; 1041 { 1042 register char *p; 1043 register char *q; 1044 register int i; 1045 char *bp; 1046 int pri; 1047 struct hostent *hp; 1048 char buf[MAXLINE]; 1049 1050 dprintf("cfline(%s)\n", line); 1051 1052 errno = 0; /* keep sys_errlist stuff out of logerror messages */ 1053 1054 /* clear out file entry */ 1055 bzero((char *) f, sizeof *f); 1056 for (i = 0; i <= LOG_NFACILITIES; i++) 1057 f->f_pmask[i] = NOPRI; 1058 1059 /* scan through the list of selectors */ 1060 for (p = line; *p && *p != '\t';) { 1061 1062 /* find the end of this facility name list */ 1063 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1064 continue; 1065 1066 /* collect priority name */ 1067 for (bp = buf; *q && !index("\t,;", *q); ) 1068 *bp++ = *q++; 1069 *bp = '\0'; 1070 1071 /* skip cruft */ 1072 while (index(", ;", *q)) 1073 q++; 1074 1075 /* decode priority name */ 1076 pri = decode(buf, PriNames); 1077 if (pri < 0) { 1078 char xbuf[200]; 1079 1080 (void) sprintf(xbuf, "unknown priority name \"%s\"", buf); 1081 logerror(xbuf); 1082 return; 1083 } 1084 1085 /* scan facilities */ 1086 while (*p && !index("\t.;", *p)) { 1087 for (bp = buf; *p && !index("\t,;.", *p); ) 1088 *bp++ = *p++; 1089 *bp = '\0'; 1090 if (*buf == '*') 1091 for (i = 0; i < LOG_NFACILITIES; i++) 1092 f->f_pmask[i] = pri; 1093 else { 1094 i = decode(buf, FacNames); 1095 if (i < 0) { 1096 char xbuf[200]; 1097 1098 (void) sprintf(xbuf, "unknown facility name \"%s\"", buf); 1099 logerror(xbuf); 1100 return; 1101 } 1102 f->f_pmask[i >> 3] = pri; 1103 } 1104 while (*p == ',' || *p == ' ') 1105 p++; 1106 } 1107 1108 p = q; 1109 } 1110 1111 /* skip to action part */ 1112 while (*p == '\t') 1113 p++; 1114 1115 switch (*p) 1116 { 1117 case '@': 1118 if (!InetInuse) 1119 break; 1120 (void) strcpy(f->f_un.f_forw.f_hname, ++p); 1121 hp = gethostbyname(p); 1122 if (hp == NULL) { 1123 extern int h_errno, h_nerr; 1124 extern char **h_errlist; 1125 1126 logerror((u_int)h_errno < h_nerr ? 1127 h_errlist[h_errno] : "Unknown error"); 1128 break; 1129 } 1130 bzero((char *) &f->f_un.f_forw.f_addr, 1131 sizeof f->f_un.f_forw.f_addr); 1132 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1133 f->f_un.f_forw.f_addr.sin_port = LogPort; 1134 bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length); 1135 f->f_type = F_FORW; 1136 break; 1137 1138 case '/': 1139 (void) strcpy(f->f_un.f_fname, p); 1140 if ((f->f_file = open(p, O_WRONLY|O_APPEND)) < 0) { 1141 f->f_file = F_UNUSED; 1142 logerror(p); 1143 break; 1144 } 1145 if (isatty(f->f_file)) { 1146 f->f_type = F_TTY; 1147 untty(); 1148 } 1149 else 1150 f->f_type = F_FILE; 1151 if (strcmp(p, ctty) == 0) 1152 f->f_type = F_CONSOLE; 1153 break; 1154 1155 case '*': 1156 f->f_type = F_WALL; 1157 break; 1158 1159 default: 1160 for (i = 0; i < MAXUNAMES && *p; i++) { 1161 for (q = p; *q && *q != ','; ) 1162 q++; 1163 (void) strncpy(f->f_un.f_uname[i], p, UNAMESZ); 1164 if ((q - p) > UNAMESZ) 1165 f->f_un.f_uname[i][UNAMESZ] = '\0'; 1166 else 1167 f->f_un.f_uname[i][q - p] = '\0'; 1168 while (*q == ',' || *q == ' ') 1169 q++; 1170 p = q; 1171 } 1172 f->f_type = F_USERS; 1173 break; 1174 } 1175 } 1176 1177 1178 /* 1179 * Decode a symbolic name to a numeric value 1180 */ 1181 1182 decode(name, codetab) 1183 char *name; 1184 struct code *codetab; 1185 { 1186 register struct code *c; 1187 register char *p; 1188 char buf[40]; 1189 1190 if (isdigit(*name)) 1191 return (atoi(name)); 1192 1193 (void) strcpy(buf, name); 1194 for (p = buf; *p; p++) 1195 if (isupper(*p)) 1196 *p = tolower(*p); 1197 for (c = codetab; c->c_name; c++) 1198 if (!strcmp(buf, c->c_name)) 1199 return (c->c_val); 1200 1201 return (-1); 1202 } 1203