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 5.27 (Berkeley) 10/10/88"; 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 <stdio.h> 57 #include <utmp.h> 58 #include <ctype.h> 59 #include <strings.h> 60 #include <setjmp.h> 61 62 #include <sys/syslog.h> 63 #include <sys/param.h> 64 #include <sys/errno.h> 65 #include <sys/ioctl.h> 66 #include <sys/stat.h> 67 #include <sys/wait.h> 68 #include <sys/socket.h> 69 #include <sys/file.h> 70 #include <sys/msgbuf.h> 71 #include <sys/uio.h> 72 #include <sys/un.h> 73 #include <sys/time.h> 74 #include <sys/resource.h> 75 #include <sys/signal.h> 76 77 #include <netinet/in.h> 78 #include <netdb.h> 79 80 #define CTTY "/dev/console" 81 char *LogName = "/dev/log"; 82 char *ConfFile = "/etc/syslog.conf"; 83 char *PidFile = "/etc/syslog.pid"; 84 char ctty[] = CTTY; 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 sunx.sun_family = AF_UNIX; 243 (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); 244 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 245 if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, 246 sizeof(sunx.sun_family)+strlen(sunx.sun_path)) < 0 || 247 chmod(LogName, 0666) < 0) { 248 (void) sprintf(line, "cannot create %s", LogName); 249 logerror(line); 250 dprintf("cannot create %s (%d)\n", LogName, errno); 251 die(0); 252 } 253 finet = socket(AF_INET, SOCK_DGRAM, 0); 254 if (finet >= 0) { 255 struct servent *sp; 256 257 sp = getservbyname("syslog", "udp"); 258 if (sp == NULL) { 259 errno = 0; 260 logerror("syslog/udp: unknown service"); 261 die(0); 262 } 263 sin.sin_family = AF_INET; 264 sin.sin_port = LogPort = sp->s_port; 265 if (bind(finet, &sin, sizeof(sin)) < 0) { 266 logerror("bind"); 267 if (!Debug) 268 die(0); 269 } else { 270 inetm = FDMASK(finet); 271 InetInuse = 1; 272 } 273 } 274 if ((fklog = open("/dev/klog", O_RDONLY)) >= 0) 275 klogm = FDMASK(fklog); 276 else { 277 dprintf("can't open /dev/klog (%d)\n", errno); 278 klogm = 0; 279 } 280 281 /* tuck my process id away */ 282 fp = fopen(PidFile, "w"); 283 if (fp != NULL) { 284 fprintf(fp, "%d\n", getpid()); 285 (void) fclose(fp); 286 } 287 288 dprintf("off & running....\n"); 289 290 init(); 291 (void) signal(SIGHUP, init); 292 293 for (;;) { 294 int nfds, readfds = FDMASK(funix) | inetm | klogm; 295 296 errno = 0; 297 dprintf("readfds = %#x\n", readfds); 298 nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, 299 (fd_set *) NULL, (struct timeval *) NULL); 300 if (nfds == 0) 301 continue; 302 if (nfds < 0) { 303 if (errno != EINTR) 304 logerror("select"); 305 continue; 306 } 307 dprintf("got a message (%d, %#x)\n", nfds, readfds); 308 if (readfds & klogm) { 309 i = read(fklog, line, sizeof(line) - 1); 310 if (i > 0) { 311 line[i] = '\0'; 312 printsys(line); 313 } else if (i < 0 && errno != EINTR) { 314 logerror("klog"); 315 fklog = -1; 316 klogm = 0; 317 } 318 } 319 if (readfds & FDMASK(funix)) { 320 len = sizeof fromunix; 321 i = recvfrom(funix, line, MAXLINE, 0, 322 (struct sockaddr *) &fromunix, &len); 323 if (i > 0) { 324 line[i] = '\0'; 325 printline(LocalHostName, line); 326 } else if (i < 0 && errno != EINTR) 327 logerror("recvfrom unix"); 328 } 329 if (readfds & inetm) { 330 len = sizeof frominet; 331 i = recvfrom(finet, line, MAXLINE, 0, &frominet, &len); 332 if (i > 0) { 333 extern char *cvthname(); 334 335 line[i] = '\0'; 336 printline(cvthname(&frominet), line); 337 } else if (i < 0 && errno != EINTR) 338 logerror("recvfrom inet"); 339 } 340 } 341 } 342 343 usage() 344 { 345 fprintf(stderr, "usage: syslogd [-d] [-m markinterval] [-p path] [-f conffile]\n"); 346 exit(1); 347 } 348 349 untty() 350 { 351 int i; 352 353 if (!Debug) { 354 i = open("/dev/tty", O_RDWR); 355 if (i >= 0) { 356 (void) ioctl(i, (int) TIOCNOTTY, (char *)0); 357 (void) close(i); 358 } 359 } 360 } 361 362 /* 363 * Take a raw input line, decode the message, and print the message 364 * on the appropriate log files. 365 */ 366 367 printline(hname, msg) 368 char *hname; 369 char *msg; 370 { 371 register char *p, *q; 372 register int c; 373 char line[MAXLINE + 1]; 374 int pri; 375 376 /* test for special codes */ 377 pri = DEFUPRI; 378 p = msg; 379 if (*p == '<') { 380 pri = 0; 381 while (isdigit(*++p)) 382 pri = 10 * pri + (*p - '0'); 383 if (*p == '>') 384 ++p; 385 } 386 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 387 pri = DEFUPRI; 388 389 /* don't allow users to log kernel messages */ 390 if (LOG_FAC(pri) == LOG_KERN) 391 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 392 393 q = line; 394 395 while ((c = *p++ & 0177) != '\0' && 396 q < &line[sizeof(line) - 1]) 397 if (c == '\n') 398 *q++ = ' '; 399 else if (iscntrl(c)) { 400 *q++ = '^'; 401 *q++ = c ^ 0100; 402 } else 403 *q++ = c; 404 *q = '\0'; 405 406 logmsg(pri, line, hname, 0); 407 } 408 409 /* 410 * Take a raw input line from /dev/klog, split and format similar to syslog(). 411 */ 412 413 printsys(msg) 414 char *msg; 415 { 416 register char *p, *q; 417 register int c; 418 char line[MAXLINE + 1]; 419 int pri, flags; 420 char *lp; 421 422 (void) sprintf(line, "vmunix: "); 423 lp = line + strlen(line); 424 for (p = msg; *p != '\0'; ) { 425 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 426 pri = DEFSPRI; 427 if (*p == '<') { 428 pri = 0; 429 while (isdigit(*++p)) 430 pri = 10 * pri + (*p - '0'); 431 if (*p == '>') 432 ++p; 433 } else { 434 /* kernel printf's come out on console */ 435 flags |= IGN_CONS; 436 } 437 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 438 pri = DEFSPRI; 439 q = lp; 440 while (*p != '\0' && (c = *p++) != '\n' && 441 q < &line[MAXLINE]) 442 *q++ = c; 443 *q = '\0'; 444 logmsg(pri, line, LocalHostName, flags); 445 } 446 } 447 448 time_t now; 449 450 /* 451 * Log a message to the appropriate log files, users, etc. based on 452 * the priority. 453 */ 454 455 logmsg(pri, msg, from, flags) 456 int pri; 457 char *msg, *from; 458 int flags; 459 { 460 register struct filed *f; 461 int fac, prilev; 462 int omask, msglen; 463 char *timestamp; 464 465 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", pri, flags, from, msg); 466 467 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 468 469 /* 470 * Check to see if msg looks non-standard. 471 */ 472 msglen = strlen(msg); 473 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 474 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 475 flags |= ADDDATE; 476 477 (void) time(&now); 478 if (flags & ADDDATE) 479 timestamp = ctime(&now) + 4; 480 else { 481 timestamp = msg; 482 msg += 16; 483 msglen -= 16; 484 } 485 486 /* extract facility and priority level */ 487 if (flags & MARK) 488 fac = LOG_NFACILITIES; 489 else 490 fac = LOG_FAC(pri); 491 prilev = LOG_PRI(pri); 492 493 /* log the message to the particular outputs */ 494 if (!Initialized) { 495 f = &consfile; 496 f->f_file = open(ctty, O_WRONLY); 497 498 if (f->f_file >= 0) { 499 untty(); 500 fprintlog(f, flags, msg); 501 (void) close(f->f_file); 502 } 503 (void) sigsetmask(omask); 504 return; 505 } 506 for (f = Files; f; f = f->f_next) { 507 /* skip messages that are incorrect priority */ 508 if (f->f_pmask[fac] < prilev || f->f_pmask[fac] == NOPRI) 509 continue; 510 511 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 512 continue; 513 514 /* don't output marks to recently written files */ 515 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 516 continue; 517 518 /* 519 * suppress duplicate lines to this file 520 */ 521 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 522 !strcmp(msg, f->f_prevline) && 523 !strcmp(from, f->f_prevhost)) { 524 (void) strncpy(f->f_lasttime, timestamp, 15); 525 f->f_prevcount++; 526 dprintf("msg repeated %d times, %ld sec of %d\n", 527 f->f_prevcount, now - f->f_time, 528 repeatinterval[f->f_repeatcount]); 529 /* 530 * If domark would have logged this by now, 531 * flush it now (so we don't hold isolated messages), 532 * but back off so we'll flush less often 533 * in the future. 534 */ 535 if (now > REPEATTIME(f)) { 536 fprintlog(f, flags, (char *)NULL); 537 BACKOFF(f); 538 } 539 } else { 540 /* new line, save it */ 541 if (f->f_prevcount) 542 fprintlog(f, 0, (char *)NULL); 543 f->f_repeatcount = 0; 544 (void) strncpy(f->f_lasttime, timestamp, 15); 545 (void) strncpy(f->f_prevhost, from, 546 sizeof(f->f_prevhost)); 547 if (msglen < MAXSVLINE) { 548 f->f_prevlen = msglen; 549 f->f_prevpri = pri; 550 (void) strcpy(f->f_prevline, msg); 551 fprintlog(f, flags, (char *)NULL); 552 } else { 553 f->f_prevline[0] = 0; 554 f->f_prevlen = 0; 555 fprintlog(f, flags, msg); 556 } 557 } 558 } 559 (void) sigsetmask(omask); 560 } 561 562 fprintlog(f, flags, msg) 563 register struct filed *f; 564 int flags; 565 char *msg; 566 { 567 struct iovec iov[6]; 568 register struct iovec *v = iov; 569 register int l; 570 char line[MAXLINE + 1]; 571 char repbuf[80]; 572 573 v->iov_base = f->f_lasttime; 574 v->iov_len = 15; 575 v++; 576 v->iov_base = " "; 577 v->iov_len = 1; 578 v++; 579 v->iov_base = f->f_prevhost; 580 v->iov_len = strlen(v->iov_base); 581 v++; 582 v->iov_base = " "; 583 v->iov_len = 1; 584 v++; 585 if (msg) { 586 v->iov_base = msg; 587 v->iov_len = strlen(msg); 588 } else if (f->f_prevcount > 1) { 589 (void) sprintf(repbuf, "last message repeated %d times", 590 f->f_prevcount); 591 v->iov_base = repbuf; 592 v->iov_len = strlen(repbuf); 593 } else { 594 v->iov_base = f->f_prevline; 595 v->iov_len = f->f_prevlen; 596 } 597 v++; 598 599 dprintf("Logging to %s", TypeNames[f->f_type]); 600 f->f_time = now; 601 602 switch (f->f_type) { 603 case F_UNUSED: 604 dprintf("\n"); 605 break; 606 607 case F_FORW: 608 dprintf(" %s\n", f->f_un.f_forw.f_hname); 609 (void) sprintf(line, "<%d>%.15s %s", f->f_prevpri, 610 iov[0].iov_base, iov[4].iov_base); 611 l = strlen(line); 612 if (l > MAXLINE) 613 l = MAXLINE; 614 if (sendto(finet, line, l, 0, &f->f_un.f_forw.f_addr, 615 sizeof f->f_un.f_forw.f_addr) != l) { 616 int e = errno; 617 (void) close(f->f_file); 618 f->f_type = F_UNUSED; 619 errno = e; 620 logerror("sendto"); 621 } 622 break; 623 624 case F_CONSOLE: 625 if (flags & IGN_CONS) { 626 dprintf(" (ignored)\n"); 627 break; 628 } 629 /* FALLTHROUGH */ 630 631 case F_TTY: 632 case F_FILE: 633 dprintf(" %s\n", f->f_un.f_fname); 634 if (f->f_type != F_FILE) { 635 v->iov_base = "\r\n"; 636 v->iov_len = 2; 637 } else { 638 v->iov_base = "\n"; 639 v->iov_len = 1; 640 } 641 again: 642 if (writev(f->f_file, iov, 6) < 0) { 643 int e = errno; 644 (void) close(f->f_file); 645 /* 646 * Check for EBADF on TTY's due to vhangup() XXX 647 */ 648 if (e == EBADF && f->f_type != F_FILE) { 649 f->f_file = open(f->f_un.f_fname, O_WRONLY|O_APPEND); 650 if (f->f_file < 0) { 651 f->f_type = F_UNUSED; 652 logerror(f->f_un.f_fname); 653 } else { 654 untty(); 655 goto again; 656 } 657 } else { 658 f->f_type = F_UNUSED; 659 errno = e; 660 logerror(f->f_un.f_fname); 661 } 662 } else if (flags & SYNC_FILE) 663 (void) fsync(f->f_file); 664 break; 665 666 case F_USERS: 667 case F_WALL: 668 dprintf("\n"); 669 v->iov_base = "\r\n"; 670 v->iov_len = 2; 671 wallmsg(f, iov); 672 break; 673 } 674 f->f_prevcount = 0; 675 } 676 677 jmp_buf ttybuf; 678 679 endtty() 680 { 681 longjmp(ttybuf, 1); 682 } 683 684 /* 685 * WALLMSG -- Write a message to the world at large 686 * 687 * Write the specified message to either the entire 688 * world, or a list of approved users. 689 */ 690 691 wallmsg(f, iov) 692 register struct filed *f; 693 struct iovec *iov; 694 { 695 register char *p; 696 register int i; 697 int ttyf, len; 698 FILE *uf; 699 static int reenter = 0; 700 struct utmp ut; 701 char greetings[200]; 702 703 if (reenter++) 704 return; 705 706 /* open the user login file */ 707 if ((uf = fopen("/etc/utmp", "r")) == NULL) { 708 logerror("/etc/utmp"); 709 reenter = 0; 710 return; 711 } 712 713 /* 714 * Might as well fork instead of using nonblocking I/O 715 * and doing notty(). 716 */ 717 if (fork() == 0) { 718 (void) signal(SIGTERM, SIG_DFL); 719 (void) alarm(0); 720 (void) signal(SIGALRM, endtty); 721 (void) signal(SIGTTOU, SIG_IGN); 722 (void) sigsetmask(0); 723 (void) sprintf(greetings, 724 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 725 iov[2].iov_base, ctime(&now)); 726 len = strlen(greetings); 727 728 /* scan the user login file */ 729 while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { 730 /* is this slot used? */ 731 if (ut.ut_name[0] == '\0') 732 continue; 733 734 /* should we send the message to this user? */ 735 if (f->f_type == F_USERS) { 736 for (i = 0; i < MAXUNAMES; i++) { 737 if (!f->f_un.f_uname[i][0]) { 738 i = MAXUNAMES; 739 break; 740 } 741 if (strncmp(f->f_un.f_uname[i], 742 ut.ut_name, UNAMESZ) == 0) 743 break; 744 } 745 if (i >= MAXUNAMES) 746 continue; 747 } 748 749 /* compute the device name */ 750 p = "/dev/12345678"; 751 strncpy(&p[5], ut.ut_line, UNAMESZ); 752 753 if (f->f_type == F_WALL) { 754 iov[0].iov_base = greetings; 755 iov[0].iov_len = len; 756 iov[1].iov_len = 0; 757 } 758 if (setjmp(ttybuf) == 0) { 759 (void) alarm(15); 760 /* open the terminal */ 761 ttyf = open(p, O_WRONLY); 762 if (ttyf >= 0) { 763 struct stat statb; 764 765 if (fstat(ttyf, &statb) == 0 && 766 (statb.st_mode & S_IWRITE)) 767 (void) writev(ttyf, iov, 6); 768 close(ttyf); 769 ttyf = -1; 770 } 771 } 772 (void) alarm(0); 773 } 774 exit(0); 775 } 776 /* close the user login file */ 777 (void) fclose(uf); 778 reenter = 0; 779 } 780 781 reapchild() 782 { 783 union wait status; 784 785 while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0) 786 ; 787 } 788 789 /* 790 * Return a printable representation of a host address. 791 */ 792 char * 793 cvthname(f) 794 struct sockaddr_in *f; 795 { 796 struct hostent *hp; 797 register char *p; 798 extern char *inet_ntoa(); 799 800 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 801 802 if (f->sin_family != AF_INET) { 803 dprintf("Malformed from address\n"); 804 return ("???"); 805 } 806 hp = gethostbyaddr(&f->sin_addr, sizeof(struct in_addr), f->sin_family); 807 if (hp == 0) { 808 dprintf("Host name for your address (%s) unknown\n", 809 inet_ntoa(f->sin_addr)); 810 return (inet_ntoa(f->sin_addr)); 811 } 812 if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 813 *p = '\0'; 814 return (hp->h_name); 815 } 816 817 domark() 818 { 819 register struct filed *f; 820 821 now = time(0); 822 MarkSeq += TIMERINTVL; 823 if (MarkSeq >= MarkInterval) { 824 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 825 MarkSeq = 0; 826 } 827 828 for (f = Files; f; f = f->f_next) { 829 if (f->f_prevcount && now >= REPEATTIME(f)) { 830 dprintf("flush %s: repeated %d times, %d sec.\n", 831 TypeNames[f->f_type], f->f_prevcount, 832 repeatinterval[f->f_repeatcount]); 833 fprintlog(f, 0, (char *)NULL); 834 BACKOFF(f); 835 } 836 } 837 (void) alarm(TIMERINTVL); 838 } 839 840 /* 841 * Print syslogd errors some place. 842 */ 843 logerror(type) 844 char *type; 845 { 846 char buf[100]; 847 848 if (errno == 0) 849 (void) sprintf(buf, "syslogd: %s", type); 850 else if ((unsigned) errno > sys_nerr) 851 (void) sprintf(buf, "syslogd: %s: error %d", type, errno); 852 else 853 (void) sprintf(buf, "syslogd: %s: %s", type, sys_errlist[errno]); 854 errno = 0; 855 dprintf("%s\n", buf); 856 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 857 } 858 859 die(sig) 860 { 861 register struct filed *f; 862 char buf[100]; 863 864 for (f = Files; f != NULL; f = f->f_next) { 865 /* flush any pending output */ 866 if (f->f_prevcount) 867 fprintlog(f, 0, (char *)NULL); 868 } 869 if (sig) { 870 dprintf("syslogd: exiting on signal %d\n", sig); 871 (void) sprintf(buf, "exiting on signal %d", sig); 872 errno = 0; 873 logerror(buf); 874 } 875 (void) unlink(LogName); 876 exit(0); 877 } 878 879 /* 880 * INIT -- Initialize syslogd from configuration table 881 */ 882 883 init() 884 { 885 register int i; 886 register FILE *cf; 887 register struct filed *f, *next, **nextp; 888 register char *p; 889 char cline[BUFSIZ]; 890 891 dprintf("init\n"); 892 893 /* 894 * Close all open log files. 895 */ 896 Initialized = 0; 897 for (f = Files; f != NULL; f = next) { 898 /* flush any pending output */ 899 if (f->f_prevcount) 900 fprintlog(f, 0, (char *)NULL); 901 902 switch (f->f_type) { 903 case F_FILE: 904 case F_TTY: 905 case F_CONSOLE: 906 (void) close(f->f_file); 907 break; 908 } 909 next = f->f_next; 910 free((char *) f); 911 } 912 Files = NULL; 913 nextp = &Files; 914 915 /* open the configuration file */ 916 if ((cf = fopen(ConfFile, "r")) == NULL) { 917 dprintf("cannot open %s\n", ConfFile); 918 *nextp = (struct filed *)calloc(1, sizeof(*f)); 919 cfline("*.ERR\t/dev/console", *nextp); 920 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 921 cfline("*.PANIC\t*", (*nextp)->f_next); 922 Initialized = 1; 923 return; 924 } 925 926 /* 927 * Foreach line in the conf table, open that file. 928 */ 929 f = NULL; 930 while (fgets(cline, sizeof cline, cf) != NULL) { 931 /* 932 * check for end-of-section, comments, strip off trailing 933 * spaces and newline character. 934 */ 935 for (p = cline; isspace(*p); ++p); 936 if (*p == NULL || *p == '#') 937 continue; 938 for (p = index(cline, '\0'); isspace(*--p);); 939 *++p = '\0'; 940 f = (struct filed *)calloc(1, sizeof(*f)); 941 *nextp = f; 942 nextp = &f->f_next; 943 cfline(cline, f); 944 } 945 946 /* close the configuration file */ 947 (void) fclose(cf); 948 949 Initialized = 1; 950 951 if (Debug) { 952 for (f = Files; f; f = f->f_next) { 953 for (i = 0; i <= LOG_NFACILITIES; i++) 954 if (f->f_pmask[i] == NOPRI) 955 printf("X "); 956 else 957 printf("%d ", f->f_pmask[i]); 958 printf("%s: ", TypeNames[f->f_type]); 959 switch (f->f_type) { 960 case F_FILE: 961 case F_TTY: 962 case F_CONSOLE: 963 printf("%s", f->f_un.f_fname); 964 break; 965 966 case F_FORW: 967 printf("%s", f->f_un.f_forw.f_hname); 968 break; 969 970 case F_USERS: 971 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 972 printf("%s, ", f->f_un.f_uname[i]); 973 break; 974 } 975 printf("\n"); 976 } 977 } 978 979 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 980 dprintf("syslogd: restarted\n"); 981 } 982 983 /* 984 * Crack a configuration file line 985 */ 986 987 struct code { 988 char *c_name; 989 int c_val; 990 }; 991 992 struct code PriNames[] = { 993 "panic", LOG_EMERG, 994 "emerg", LOG_EMERG, 995 "alert", LOG_ALERT, 996 "crit", LOG_CRIT, 997 "err", LOG_ERR, 998 "error", LOG_ERR, 999 "warn", LOG_WARNING, 1000 "warning", LOG_WARNING, 1001 "notice", LOG_NOTICE, 1002 "info", LOG_INFO, 1003 "debug", LOG_DEBUG, 1004 "none", NOPRI, 1005 NULL, -1 1006 }; 1007 1008 struct code FacNames[] = { 1009 "kern", LOG_KERN, 1010 "user", LOG_USER, 1011 "mail", LOG_MAIL, 1012 "daemon", LOG_DAEMON, 1013 "auth", LOG_AUTH, 1014 "security", LOG_AUTH, 1015 "mark", LOG_MARK, 1016 "syslog", LOG_SYSLOG, 1017 "lpr", LOG_LPR, 1018 "news", LOG_NEWS, 1019 "uucp", LOG_UUCP, 1020 "local0", LOG_LOCAL0, 1021 "local1", LOG_LOCAL1, 1022 "local2", LOG_LOCAL2, 1023 "local3", LOG_LOCAL3, 1024 "local4", LOG_LOCAL4, 1025 "local5", LOG_LOCAL5, 1026 "local6", LOG_LOCAL6, 1027 "local7", LOG_LOCAL7, 1028 NULL, -1 1029 }; 1030 1031 cfline(line, f) 1032 char *line; 1033 register struct filed *f; 1034 { 1035 register char *p; 1036 register char *q; 1037 register int i; 1038 char *bp; 1039 int pri; 1040 struct hostent *hp; 1041 char buf[MAXLINE]; 1042 1043 dprintf("cfline(%s)\n", line); 1044 1045 errno = 0; /* keep sys_errlist stuff out of logerror messages */ 1046 1047 /* clear out file entry */ 1048 bzero((char *) f, sizeof *f); 1049 for (i = 0; i <= LOG_NFACILITIES; i++) 1050 f->f_pmask[i] = NOPRI; 1051 1052 /* scan through the list of selectors */ 1053 for (p = line; *p && *p != '\t';) { 1054 1055 /* find the end of this facility name list */ 1056 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1057 continue; 1058 1059 /* collect priority name */ 1060 for (bp = buf; *q && !index("\t,;", *q); ) 1061 *bp++ = *q++; 1062 *bp = '\0'; 1063 1064 /* skip cruft */ 1065 while (index(", ;", *q)) 1066 q++; 1067 1068 /* decode priority name */ 1069 pri = decode(buf, PriNames); 1070 if (pri < 0) { 1071 char xbuf[200]; 1072 1073 (void) sprintf(xbuf, "unknown priority name \"%s\"", buf); 1074 logerror(xbuf); 1075 return; 1076 } 1077 1078 /* scan facilities */ 1079 while (*p && !index("\t.;", *p)) { 1080 for (bp = buf; *p && !index("\t,;.", *p); ) 1081 *bp++ = *p++; 1082 *bp = '\0'; 1083 if (*buf == '*') 1084 for (i = 0; i < LOG_NFACILITIES; i++) 1085 f->f_pmask[i] = pri; 1086 else { 1087 i = decode(buf, FacNames); 1088 if (i < 0) { 1089 char xbuf[200]; 1090 1091 (void) sprintf(xbuf, "unknown facility name \"%s\"", buf); 1092 logerror(xbuf); 1093 return; 1094 } 1095 f->f_pmask[i >> 3] = pri; 1096 } 1097 while (*p == ',' || *p == ' ') 1098 p++; 1099 } 1100 1101 p = q; 1102 } 1103 1104 /* skip to action part */ 1105 while (*p == '\t') 1106 p++; 1107 1108 switch (*p) 1109 { 1110 case '@': 1111 if (!InetInuse) 1112 break; 1113 (void) strcpy(f->f_un.f_forw.f_hname, ++p); 1114 hp = gethostbyname(p); 1115 if (hp == NULL) { 1116 extern int h_errno, h_nerr; 1117 extern char **h_errlist; 1118 1119 logerror((u_int)h_errno < h_nerr ? 1120 h_errlist[h_errno] : "Unknown error"); 1121 break; 1122 } 1123 bzero((char *) &f->f_un.f_forw.f_addr, 1124 sizeof f->f_un.f_forw.f_addr); 1125 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1126 f->f_un.f_forw.f_addr.sin_port = LogPort; 1127 bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length); 1128 f->f_type = F_FORW; 1129 break; 1130 1131 case '/': 1132 (void) strcpy(f->f_un.f_fname, p); 1133 if ((f->f_file = open(p, O_WRONLY|O_APPEND)) < 0) { 1134 f->f_file = F_UNUSED; 1135 logerror(p); 1136 break; 1137 } 1138 if (isatty(f->f_file)) { 1139 f->f_type = F_TTY; 1140 untty(); 1141 } 1142 else 1143 f->f_type = F_FILE; 1144 if (strcmp(p, ctty) == 0) 1145 f->f_type = F_CONSOLE; 1146 break; 1147 1148 case '*': 1149 f->f_type = F_WALL; 1150 break; 1151 1152 default: 1153 for (i = 0; i < MAXUNAMES && *p; i++) { 1154 for (q = p; *q && *q != ','; ) 1155 q++; 1156 (void) strncpy(f->f_un.f_uname[i], p, UNAMESZ); 1157 if ((q - p) > UNAMESZ) 1158 f->f_un.f_uname[i][UNAMESZ] = '\0'; 1159 else 1160 f->f_un.f_uname[i][q - p] = '\0'; 1161 while (*q == ',' || *q == ' ') 1162 q++; 1163 p = q; 1164 } 1165 f->f_type = F_USERS; 1166 break; 1167 } 1168 } 1169 1170 1171 /* 1172 * Decode a symbolic name to a numeric value 1173 */ 1174 1175 decode(name, codetab) 1176 char *name; 1177 struct code *codetab; 1178 { 1179 register struct code *c; 1180 register char *p; 1181 char buf[40]; 1182 1183 if (isdigit(*name)) 1184 return (atoi(name)); 1185 1186 (void) strcpy(buf, name); 1187 for (p = buf; *p; p++) 1188 if (isupper(*p)) 1189 *p = tolower(*p); 1190 for (c = codetab; c->c_name; c++) 1191 if (!strcmp(buf, c->c_name)) 1192 return (c->c_val); 1193 1194 return (-1); 1195 } 1196