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 5.24 (Berkeley) 06/18/88"; 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 char line[MSG_BSIZE + 1]; 188 extern int die(), domark(), reapchild(); 189 190 while (--argc > 0) { 191 p = *++argv; 192 if (p[0] != '-') 193 usage(); 194 switch (p[1]) { 195 case 'f': /* configuration file */ 196 if (p[2] != '\0') 197 ConfFile = &p[2]; 198 break; 199 200 case 'd': /* debug */ 201 Debug++; 202 break; 203 204 case 'p': /* path */ 205 if (p[2] != '\0') 206 LogName = &p[2]; 207 break; 208 209 case 'm': /* mark interval */ 210 if (p[2] != '\0') 211 MarkInterval = atoi(&p[2]) * 60; 212 break; 213 214 default: 215 usage(); 216 } 217 } 218 219 if (!Debug) { 220 if (fork()) 221 exit(0); 222 for (i = 0; i < 10; i++) 223 (void) close(i); 224 (void) open("/", 0); 225 (void) dup2(0, 1); 226 (void) dup2(0, 2); 227 untty(); 228 } else 229 setlinebuf(stdout); 230 231 consfile.f_type = F_CONSOLE; 232 (void) strcpy(consfile.f_un.f_fname, ctty); 233 (void) gethostname(LocalHostName, sizeof LocalHostName); 234 if (p = index(LocalHostName, '.')) { 235 *p++ = '\0'; 236 LocalDomain = p; 237 } 238 else 239 LocalDomain = ""; 240 (void) signal(SIGTERM, die); 241 (void) signal(SIGINT, Debug ? die : SIG_IGN); 242 (void) signal(SIGQUIT, Debug ? die : SIG_IGN); 243 (void) signal(SIGCHLD, reapchild); 244 (void) signal(SIGALRM, domark); 245 (void) alarm(TIMERINTVL); 246 (void) unlink(LogName); 247 248 sunx.sun_family = AF_UNIX; 249 (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); 250 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 251 if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, 252 sizeof(sunx.sun_family)+strlen(sunx.sun_path)) < 0 || 253 chmod(LogName, 0666) < 0) { 254 (void) sprintf(line, "cannot create %s", LogName); 255 logerror(line); 256 dprintf("cannot create %s (%d)\n", LogName, errno); 257 die(0); 258 } 259 finet = socket(AF_INET, SOCK_DGRAM, 0); 260 if (finet >= 0) { 261 struct servent *sp; 262 263 sp = getservbyname("syslog", "udp"); 264 if (sp == NULL) { 265 errno = 0; 266 logerror("syslog/udp: unknown service"); 267 die(0); 268 } 269 sin.sin_family = AF_INET; 270 sin.sin_port = LogPort = sp->s_port; 271 if (bind(finet, &sin, sizeof(sin)) < 0) { 272 logerror("bind"); 273 if (!Debug) 274 die(0); 275 } else { 276 inetm = FDMASK(finet); 277 InetInuse = 1; 278 } 279 } 280 if ((fklog = open("/dev/klog", O_RDONLY)) >= 0) 281 klogm = FDMASK(fklog); 282 else { 283 dprintf("can't open /dev/klog (%d)\n", errno); 284 klogm = 0; 285 } 286 287 /* tuck my process id away */ 288 fp = fopen(PidFile, "w"); 289 if (fp != NULL) { 290 fprintf(fp, "%d\n", getpid()); 291 (void) fclose(fp); 292 } 293 294 dprintf("off & running....\n"); 295 296 init(); 297 (void) signal(SIGHUP, init); 298 299 for (;;) { 300 int nfds, readfds = FDMASK(funix) | inetm | klogm; 301 302 errno = 0; 303 dprintf("readfds = %#x\n", readfds); 304 nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, 305 (fd_set *) NULL, (struct timeval *) NULL); 306 if (nfds == 0) 307 continue; 308 if (nfds < 0) { 309 if (errno != EINTR) 310 logerror("select"); 311 continue; 312 } 313 dprintf("got a message (%d, %#x)\n", nfds, readfds); 314 if (readfds & klogm) { 315 i = read(fklog, line, sizeof(line) - 1); 316 if (i > 0) { 317 line[i] = '\0'; 318 printsys(line); 319 } else if (i < 0 && errno != EINTR) { 320 logerror("klog"); 321 fklog = -1; 322 klogm = 0; 323 } 324 } 325 if (readfds & FDMASK(funix)) { 326 len = sizeof fromunix; 327 i = recvfrom(funix, line, MAXLINE, 0, 328 (struct sockaddr *) &fromunix, &len); 329 if (i > 0) { 330 line[i] = '\0'; 331 printline(LocalHostName, line); 332 } else if (i < 0 && errno != EINTR) 333 logerror("recvfrom unix"); 334 } 335 if (readfds & inetm) { 336 len = sizeof frominet; 337 i = recvfrom(finet, line, MAXLINE, 0, &frominet, &len); 338 if (i > 0) { 339 extern char *cvthname(); 340 341 line[i] = '\0'; 342 printline(cvthname(&frominet), line); 343 } else if (i < 0 && errno != EINTR) 344 logerror("recvfrom inet"); 345 } 346 } 347 } 348 349 usage() 350 { 351 fprintf(stderr, "usage: syslogd [-d] [-mmarkinterval] [-ppath] [-fconffile]\n"); 352 exit(1); 353 } 354 355 untty() 356 { 357 int i; 358 359 if (!Debug) { 360 i = open("/dev/tty", O_RDWR); 361 if (i >= 0) { 362 (void) ioctl(i, (int) TIOCNOTTY, (char *)0); 363 (void) close(i); 364 } 365 } 366 } 367 368 /* 369 * Take a raw input line, decode the message, and print the message 370 * on the appropriate log files. 371 */ 372 373 printline(hname, msg) 374 char *hname; 375 char *msg; 376 { 377 register char *p, *q; 378 register int c; 379 char line[MAXLINE + 1]; 380 int pri; 381 382 /* test for special codes */ 383 pri = DEFUPRI; 384 p = msg; 385 if (*p == '<') { 386 pri = 0; 387 while (isdigit(*++p)) 388 pri = 10 * pri + (*p - '0'); 389 if (*p == '>') 390 ++p; 391 } 392 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 393 pri = DEFUPRI; 394 395 /* don't allow users to log kernel messages */ 396 if (LOG_FAC(pri) == LOG_KERN) 397 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 398 399 q = line; 400 401 while ((c = *p++ & 0177) != '\0' && c != '\n' && 402 q < &line[sizeof(line) - 1]) { 403 if (iscntrl(c)) { 404 *q++ = '^'; 405 *q++ = c ^ 0100; 406 } else 407 *q++ = c; 408 } 409 *q = '\0'; 410 411 logmsg(pri, line, hname, 0); 412 } 413 414 /* 415 * Take a raw input line from /dev/klog, split and format similar to syslog(). 416 */ 417 418 printsys(msg) 419 char *msg; 420 { 421 register char *p, *q; 422 register int c; 423 char line[MAXLINE + 1]; 424 int pri, flags; 425 char *lp; 426 427 (void) sprintf(line, "vmunix: "); 428 lp = line + strlen(line); 429 for (p = msg; *p != '\0'; ) { 430 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 431 pri = DEFSPRI; 432 if (*p == '<') { 433 pri = 0; 434 while (isdigit(*++p)) 435 pri = 10 * pri + (*p - '0'); 436 if (*p == '>') 437 ++p; 438 } else { 439 /* kernel printf's come out on console */ 440 flags |= IGN_CONS; 441 } 442 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 443 pri = DEFSPRI; 444 q = lp; 445 while (*p != '\0' && (c = *p++) != '\n' && 446 q < &line[MAXLINE]) 447 *q++ = c; 448 *q = '\0'; 449 logmsg(pri, line, LocalHostName, flags); 450 } 451 } 452 453 time_t now; 454 455 /* 456 * Log a message to the appropriate log files, users, etc. based on 457 * the priority. 458 */ 459 460 logmsg(pri, msg, from, flags) 461 int pri; 462 char *msg, *from; 463 int flags; 464 { 465 register struct filed *f; 466 int fac, prilev; 467 int omask, msglen; 468 char *timestamp; 469 470 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", pri, flags, from, msg); 471 472 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 473 474 /* 475 * Check to see if msg looks non-standard. 476 */ 477 msglen = strlen(msg); 478 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 479 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 480 flags |= ADDDATE; 481 482 (void) time(&now); 483 if (flags & ADDDATE) 484 timestamp = ctime(&now) + 4; 485 else { 486 timestamp = msg; 487 msg += 16; 488 msglen -= 16; 489 } 490 491 /* extract facility and priority level */ 492 if (flags & MARK) 493 fac = LOG_NFACILITIES; 494 else 495 fac = LOG_FAC(pri); 496 prilev = LOG_PRI(pri); 497 498 /* log the message to the particular outputs */ 499 if (!Initialized) { 500 f = &consfile; 501 f->f_file = open(ctty, O_WRONLY); 502 503 if (f->f_file >= 0) { 504 untty(); 505 fprintlog(f, flags, (char *)NULL); 506 (void) close(f->f_file); 507 } 508 (void) sigsetmask(omask); 509 return; 510 } 511 for (f = Files; f; f = f->f_next) { 512 /* skip messages that are incorrect priority */ 513 if (f->f_pmask[fac] < prilev || f->f_pmask[fac] == NOPRI) 514 continue; 515 516 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 517 continue; 518 519 /* don't output marks to recently written files */ 520 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 521 continue; 522 523 /* 524 * suppress duplicate lines to this file 525 */ 526 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 527 !strcmp(msg, f->f_prevline) && 528 !strcmp(from, f->f_prevhost)) { 529 (void) strncpy(f->f_lasttime, timestamp, 15); 530 f->f_prevcount++; 531 dprintf("msg repeated %d times, %d sec of %d\n", 532 f->f_prevcount, now - f->f_time, 533 repeatinterval[f->f_repeatcount]); 534 /* 535 * If domark would have logged this by now, 536 * flush it now (so we don't hold isolated messages), 537 * but back off so we'll flush less often 538 * in the future. 539 */ 540 if (now > REPEATTIME(f)) { 541 fprintlog(f, flags, (char *)NULL); 542 BACKOFF(f); 543 } 544 } else { 545 /* new line, save it */ 546 if (f->f_prevcount) 547 fprintlog(f, 0, (char *)NULL); 548 f->f_repeatcount = 0; 549 (void) strncpy(f->f_lasttime, timestamp, 15); 550 (void) strncpy(f->f_prevhost, from, 551 sizeof(f->f_prevhost)); 552 if (msglen < MAXSVLINE) { 553 f->f_prevlen = msglen; 554 f->f_prevpri = pri; 555 (void) strcpy(f->f_prevline, msg); 556 fprintlog(f, flags, (char *)NULL); 557 } else { 558 f->f_prevline[0] = 0; 559 f->f_prevlen = 0; 560 fprintlog(f, flags, msg); 561 } 562 } 563 } 564 (void) sigsetmask(omask); 565 } 566 567 fprintlog(f, flags, msg) 568 register struct filed *f; 569 int flags; 570 char *msg; 571 { 572 struct iovec iov[6]; 573 register struct iovec *v = iov; 574 register int l; 575 char line[MAXLINE + 1]; 576 char repbuf[80]; 577 578 v->iov_base = f->f_lasttime; 579 v->iov_len = 15; 580 v++; 581 v->iov_base = " "; 582 v->iov_len = 1; 583 v++; 584 v->iov_base = f->f_prevhost; 585 v->iov_len = strlen(v->iov_base); 586 v++; 587 v->iov_base = " "; 588 v->iov_len = 1; 589 v++; 590 if (msg) { 591 v->iov_base = msg; 592 v->iov_len = strlen(msg); 593 } else if (f->f_prevcount > 1) { 594 (void) sprintf(repbuf, "last message repeated %d times", 595 f->f_prevcount); 596 v->iov_base = repbuf; 597 v->iov_len = strlen(repbuf); 598 } else { 599 v->iov_base = f->f_prevline; 600 v->iov_len = f->f_prevlen; 601 } 602 v++; 603 604 dprintf("Logging to %s", TypeNames[f->f_type]); 605 f->f_time = now; 606 607 switch (f->f_type) { 608 case F_UNUSED: 609 dprintf("\n"); 610 break; 611 612 case F_FORW: 613 dprintf(" %s\n", f->f_un.f_forw.f_hname); 614 (void) sprintf(line, "<%d>%.15s %s", f->f_prevpri, 615 iov[0].iov_base, iov[4].iov_base); 616 l = strlen(line); 617 if (l > MAXLINE) 618 l = MAXLINE; 619 if (sendto(finet, line, l, 0, &f->f_un.f_forw.f_addr, 620 sizeof f->f_un.f_forw.f_addr) != l) { 621 int e = errno; 622 (void) close(f->f_file); 623 f->f_type = F_UNUSED; 624 errno = e; 625 logerror("sendto"); 626 } 627 break; 628 629 case F_CONSOLE: 630 if (flags & IGN_CONS) { 631 dprintf(" (ignored)\n"); 632 break; 633 } 634 /* FALLTHROUGH */ 635 636 case F_TTY: 637 case F_FILE: 638 dprintf(" %s\n", f->f_un.f_fname); 639 if (f->f_type != F_FILE) { 640 v->iov_base = "\r\n"; 641 v->iov_len = 2; 642 } else { 643 v->iov_base = "\n"; 644 v->iov_len = 1; 645 } 646 again: 647 if (writev(f->f_file, iov, 6) < 0) { 648 int e = errno; 649 (void) close(f->f_file); 650 /* 651 * Check for EBADF on TTY's due to vhangup() XXX 652 */ 653 if (e == EBADF && f->f_type != F_FILE) { 654 f->f_file = open(f->f_un.f_fname, O_WRONLY|O_APPEND); 655 if (f->f_file < 0) { 656 f->f_type = F_UNUSED; 657 logerror(f->f_un.f_fname); 658 } else { 659 untty(); 660 goto again; 661 } 662 } else { 663 f->f_type = F_UNUSED; 664 errno = e; 665 logerror(f->f_un.f_fname); 666 } 667 } else if (flags & SYNC_FILE) 668 (void) fsync(f->f_file); 669 break; 670 671 case F_USERS: 672 case F_WALL: 673 dprintf("\n"); 674 v->iov_base = "\r\n"; 675 v->iov_len = 2; 676 wallmsg(f, iov); 677 break; 678 } 679 f->f_prevcount = 0; 680 } 681 682 jmp_buf ttybuf; 683 684 endtty() 685 { 686 longjmp(ttybuf, 1); 687 } 688 689 /* 690 * WALLMSG -- Write a message to the world at large 691 * 692 * Write the specified message to either the entire 693 * world, or a list of approved users. 694 */ 695 696 wallmsg(f, iov) 697 register struct filed *f; 698 struct iovec *iov; 699 { 700 register char *p; 701 register int i; 702 int ttyf, len; 703 FILE *uf; 704 static int reenter = 0; 705 struct utmp ut; 706 char greetings[200]; 707 708 if (reenter++) 709 return; 710 711 /* open the user login file */ 712 if ((uf = fopen("/etc/utmp", "r")) == NULL) { 713 logerror("/etc/utmp"); 714 reenter = 0; 715 return; 716 } 717 718 /* 719 * Might as well fork instead of using nonblocking I/O 720 * and doing notty(). 721 */ 722 if (fork() == 0) { 723 (void) signal(SIGTERM, SIG_DFL); 724 (void) alarm(0); 725 (void) signal(SIGALRM, endtty); 726 (void) signal(SIGTTOU, SIG_IGN); 727 (void) sigsetmask(0); 728 (void) sprintf(greetings, 729 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 730 iov[2].iov_base, ctime(&now)); 731 len = strlen(greetings); 732 733 /* scan the user login file */ 734 while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { 735 /* is this slot used? */ 736 if (ut.ut_name[0] == '\0') 737 continue; 738 739 /* should we send the message to this user? */ 740 if (f->f_type == F_USERS) { 741 for (i = 0; i < MAXUNAMES; i++) { 742 if (!f->f_un.f_uname[i][0]) { 743 i = MAXUNAMES; 744 break; 745 } 746 if (strncmp(f->f_un.f_uname[i], 747 ut.ut_name, UNAMESZ) == 0) 748 break; 749 } 750 if (i >= MAXUNAMES) 751 continue; 752 } 753 754 /* compute the device name */ 755 p = "/dev/12345678"; 756 strncpy(&p[5], ut.ut_line, UNAMESZ); 757 758 if (f->f_type == F_WALL) { 759 iov[0].iov_base = greetings; 760 iov[0].iov_len = len; 761 iov[1].iov_len = 0; 762 } 763 if (setjmp(ttybuf) == 0) { 764 (void) alarm(15); 765 /* open the terminal */ 766 ttyf = open(p, O_WRONLY); 767 if (ttyf >= 0) { 768 struct stat statb; 769 770 if (fstat(ttyf, &statb) == 0 && 771 (statb.st_mode & S_IWRITE)) 772 (void) writev(ttyf, iov, 6); 773 close(ttyf); 774 ttyf = -1; 775 } 776 } 777 (void) alarm(0); 778 } 779 exit(0); 780 } 781 /* close the user login file */ 782 (void) fclose(uf); 783 reenter = 0; 784 } 785 786 reapchild() 787 { 788 union wait status; 789 790 while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0) 791 ; 792 } 793 794 /* 795 * Return a printable representation of a host address. 796 */ 797 char * 798 cvthname(f) 799 struct sockaddr_in *f; 800 { 801 struct hostent *hp; 802 register char *p; 803 extern char *inet_ntoa(); 804 805 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 806 807 if (f->sin_family != AF_INET) { 808 dprintf("Malformed from address\n"); 809 return ("???"); 810 } 811 hp = gethostbyaddr(&f->sin_addr, sizeof(struct in_addr), f->sin_family); 812 if (hp == 0) { 813 dprintf("Host name for your address (%s) unknown\n", 814 inet_ntoa(f->sin_addr)); 815 return (inet_ntoa(f->sin_addr)); 816 } 817 if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 818 *p = '\0'; 819 return (hp->h_name); 820 } 821 822 domark() 823 { 824 register struct filed *f; 825 826 now = time(0); 827 MarkSeq += TIMERINTVL; 828 if (MarkSeq >= MarkInterval) { 829 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 830 MarkSeq = 0; 831 } 832 833 for (f = Files; f; f = f->f_next) { 834 if (f->f_prevcount && now >= REPEATTIME(f)) { 835 dprintf("flush %s: repeated %d times, %d sec.\n", 836 TypeNames[f->f_type], f->f_prevcount, 837 repeatinterval[f->f_repeatcount]); 838 fprintlog(f, 0, (char *)NULL); 839 BACKOFF(f); 840 } 841 } 842 (void) alarm(TIMERINTVL); 843 } 844 845 /* 846 * Print syslogd errors some place. 847 */ 848 logerror(type) 849 char *type; 850 { 851 char buf[100]; 852 853 if (errno == 0) 854 (void) sprintf(buf, "syslogd: %s", type); 855 else if ((unsigned) errno > sys_nerr) 856 (void) sprintf(buf, "syslogd: %s: error %d", type, errno); 857 else 858 (void) sprintf(buf, "syslogd: %s: %s", type, sys_errlist[errno]); 859 errno = 0; 860 dprintf("%s\n", buf); 861 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 862 } 863 864 die(sig) 865 { 866 register struct filed *f; 867 char buf[100]; 868 869 for (f = Files; f != NULL; f = f->f_next) { 870 /* flush any pending output */ 871 if (f->f_prevcount) 872 fprintlog(f, 0, (char *)NULL); 873 } 874 if (sig) { 875 dprintf("syslogd: exiting on signal %d\n", sig); 876 (void) sprintf(buf, "exiting on signal %d", sig); 877 errno = 0; 878 logerror(buf); 879 } 880 (void) unlink(LogName); 881 exit(0); 882 } 883 884 /* 885 * INIT -- Initialize syslogd from configuration table 886 */ 887 888 init() 889 { 890 register int i; 891 register FILE *cf; 892 register struct filed *f, *next, **nextp; 893 register char *p; 894 char cline[BUFSIZ]; 895 896 dprintf("init\n"); 897 898 /* 899 * Close all open log files. 900 */ 901 Initialized = 0; 902 for (f = Files; f != NULL; f = next) { 903 /* flush any pending output */ 904 if (f->f_prevcount) 905 fprintlog(f, 0, (char *)NULL); 906 907 switch (f->f_type) { 908 case F_FILE: 909 case F_TTY: 910 case F_CONSOLE: 911 (void) close(f->f_file); 912 break; 913 } 914 next = f->f_next; 915 free((char *) f); 916 } 917 Files = NULL; 918 nextp = &Files; 919 920 /* open the configuration file */ 921 if ((cf = fopen(ConfFile, "r")) == NULL) { 922 dprintf("cannot open %s\n", ConfFile); 923 *nextp = (struct filed *)calloc(1, sizeof(*f)); 924 cfline("*.ERR\t/dev/console", *nextp); 925 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 926 cfline("*.PANIC\t*", (*nextp)->f_next); 927 Initialized = 1; 928 return; 929 } 930 931 /* 932 * Foreach line in the conf table, open that file. 933 */ 934 f = NULL; 935 while (fgets(cline, sizeof cline, cf) != NULL) { 936 /* 937 * check for end-of-section, comments, strip off trailing 938 * spaces and newline character. 939 */ 940 for (p = cline; isspace(*p); ++p); 941 if (*p == NULL || *p == '#') 942 continue; 943 for (p = index(cline, '\0'); isspace(*--p);); 944 *++p = '\0'; 945 f = (struct filed *)calloc(1, sizeof(*f)); 946 *nextp = f; 947 nextp = &f->f_next; 948 cfline(cline, f); 949 } 950 951 /* close the configuration file */ 952 (void) fclose(cf); 953 954 Initialized = 1; 955 956 if (Debug) { 957 for (f = Files; f; f = f->f_next) { 958 for (i = 0; i <= LOG_NFACILITIES; i++) 959 if (f->f_pmask[i] == NOPRI) 960 printf("X "); 961 else 962 printf("%d ", f->f_pmask[i]); 963 printf("%s: ", TypeNames[f->f_type]); 964 switch (f->f_type) { 965 case F_FILE: 966 case F_TTY: 967 case F_CONSOLE: 968 printf("%s", f->f_un.f_fname); 969 break; 970 971 case F_FORW: 972 printf("%s", f->f_un.f_forw.f_hname); 973 break; 974 975 case F_USERS: 976 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 977 printf("%s, ", f->f_un.f_uname[i]); 978 break; 979 } 980 printf("\n"); 981 } 982 } 983 984 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 985 dprintf("syslogd: restarted\n"); 986 } 987 988 /* 989 * Crack a configuration file line 990 */ 991 992 struct code { 993 char *c_name; 994 int c_val; 995 }; 996 997 struct code PriNames[] = { 998 "panic", LOG_EMERG, 999 "emerg", LOG_EMERG, 1000 "alert", LOG_ALERT, 1001 "crit", LOG_CRIT, 1002 "err", LOG_ERR, 1003 "error", LOG_ERR, 1004 "warn", LOG_WARNING, 1005 "warning", LOG_WARNING, 1006 "notice", LOG_NOTICE, 1007 "info", LOG_INFO, 1008 "debug", LOG_DEBUG, 1009 "none", NOPRI, 1010 NULL, -1 1011 }; 1012 1013 struct code FacNames[] = { 1014 "kern", LOG_KERN, 1015 "user", LOG_USER, 1016 "mail", LOG_MAIL, 1017 "daemon", LOG_DAEMON, 1018 "auth", LOG_AUTH, 1019 "security", LOG_AUTH, 1020 "mark", LOG_MARK, 1021 "syslog", LOG_SYSLOG, 1022 "lpr", LOG_LPR, 1023 "news", LOG_NEWS, 1024 "uucp", LOG_UUCP, 1025 "local0", LOG_LOCAL0, 1026 "local1", LOG_LOCAL1, 1027 "local2", LOG_LOCAL2, 1028 "local3", LOG_LOCAL3, 1029 "local4", LOG_LOCAL4, 1030 "local5", LOG_LOCAL5, 1031 "local6", LOG_LOCAL6, 1032 "local7", LOG_LOCAL7, 1033 NULL, -1 1034 }; 1035 1036 cfline(line, f) 1037 char *line; 1038 register struct filed *f; 1039 { 1040 register char *p; 1041 register char *q; 1042 register int i; 1043 char *bp; 1044 int pri; 1045 struct hostent *hp; 1046 char buf[MAXLINE]; 1047 1048 dprintf("cfline(%s)\n", line); 1049 1050 errno = 0; /* keep sys_errlist stuff out of logerror messages */ 1051 1052 /* clear out file entry */ 1053 bzero((char *) f, sizeof *f); 1054 for (i = 0; i <= LOG_NFACILITIES; i++) 1055 f->f_pmask[i] = NOPRI; 1056 1057 /* scan through the list of selectors */ 1058 for (p = line; *p && *p != '\t';) { 1059 1060 /* find the end of this facility name list */ 1061 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1062 continue; 1063 1064 /* collect priority name */ 1065 for (bp = buf; *q && !index("\t,;", *q); ) 1066 *bp++ = *q++; 1067 *bp = '\0'; 1068 1069 /* skip cruft */ 1070 while (index(", ;", *q)) 1071 q++; 1072 1073 /* decode priority name */ 1074 pri = decode(buf, PriNames); 1075 if (pri < 0) { 1076 char xbuf[200]; 1077 1078 (void) sprintf(xbuf, "unknown priority name \"%s\"", buf); 1079 logerror(xbuf); 1080 return; 1081 } 1082 1083 /* scan facilities */ 1084 while (*p && !index("\t.;", *p)) { 1085 int i; 1086 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 char buf[100]; 1124 1125 (void) sprintf(buf, "unknown host %s", p); 1126 errno = 0; 1127 logerror(buf); 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