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, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 char copyright[] = 36 "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\ 37 All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)syslogd.c 5.45 (Berkeley) 3/2/91";*/ 42 static char rcsid[] = "$Id: syslogd.c,v 1.2 1993/08/01 17:55:38 mycroft Exp $"; 43 #endif /* not lint */ 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximimum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 */ 66 67 #define MAXLINE 1024 /* maximum line length */ 68 #define MAXSVLINE 120 /* maximum saved line length */ 69 #define DEFUPRI (LOG_USER|LOG_NOTICE) 70 #define DEFSPRI (LOG_KERN|LOG_CRIT) 71 #define TIMERINTVL 30 /* interval for checking flush, mark */ 72 73 #include <sys/param.h> 74 #include <sys/errno.h> 75 #include <sys/ioctl.h> 76 #include <sys/stat.h> 77 #include <sys/wait.h> 78 #include <sys/socket.h> 79 #include <sys/file.h> 80 #include <sys/msgbuf.h> 81 #include <sys/uio.h> 82 #include <sys/un.h> 83 #include <sys/time.h> 84 #include <sys/resource.h> 85 #include <sys/signal.h> 86 87 #include <netinet/in.h> 88 #include <netdb.h> 89 90 #include <utmp.h> 91 #include <setjmp.h> 92 #include <stdio.h> 93 #include <ctype.h> 94 #include <string.h> 95 #include <unistd.h> 96 #include "pathnames.h" 97 98 #define SYSLOG_NAMES 99 #include <sys/syslog.h> 100 101 char *LogName = _PATH_LOG; 102 char *ConfFile = _PATH_LOGCONF; 103 char *PidFile = _PATH_LOGPID; 104 char ctty[] = _PATH_CONSOLE; 105 106 #define FDMASK(fd) (1 << (fd)) 107 108 #define dprintf if (Debug) printf 109 110 #define MAXUNAMES 20 /* maximum number of user names */ 111 112 /* 113 * Flags to logmsg(). 114 */ 115 116 #define IGN_CONS 0x001 /* don't print on console */ 117 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 118 #define ADDDATE 0x004 /* add a date to the message */ 119 #define MARK 0x008 /* this message is a mark */ 120 121 /* 122 * This structure represents the files that will have log 123 * copies printed. 124 */ 125 126 struct filed { 127 struct filed *f_next; /* next in linked list */ 128 short f_type; /* entry type, see below */ 129 short f_file; /* file descriptor */ 130 time_t f_time; /* time this was last written */ 131 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 132 union { 133 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 134 struct { 135 char f_hname[MAXHOSTNAMELEN+1]; 136 struct sockaddr_in f_addr; 137 } f_forw; /* forwarding address */ 138 char f_fname[MAXPATHLEN]; 139 } f_un; 140 char f_prevline[MAXSVLINE]; /* last message logged */ 141 char f_lasttime[16]; /* time of last occurrence */ 142 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 143 int f_prevpri; /* pri of f_prevline */ 144 int f_prevlen; /* length of f_prevline */ 145 int f_prevcount; /* repetition cnt of prevline */ 146 int f_repeatcount; /* number of "repeated" msgs */ 147 }; 148 149 /* 150 * Intervals at which we flush out "message repeated" messages, 151 * in seconds after previous message is logged. After each flush, 152 * we move to the next interval until we reach the largest. 153 */ 154 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 155 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 156 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 157 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 158 (f)->f_repeatcount = MAXREPEAT; \ 159 } 160 161 /* values for f_type */ 162 #define F_UNUSED 0 /* unused entry */ 163 #define F_FILE 1 /* regular file */ 164 #define F_TTY 2 /* terminal */ 165 #define F_CONSOLE 3 /* console terminal */ 166 #define F_FORW 4 /* remote machine */ 167 #define F_USERS 5 /* list of users */ 168 #define F_WALL 6 /* everyone logged on */ 169 170 char *TypeNames[7] = { 171 "UNUSED", "FILE", "TTY", "CONSOLE", 172 "FORW", "USERS", "WALL" 173 }; 174 175 struct filed *Files; 176 struct filed consfile; 177 178 int Debug; /* debug flag */ 179 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 180 char *LocalDomain; /* our local domain name */ 181 int InetInuse = 0; /* non-zero if INET sockets are being used */ 182 int finet; /* Internet datagram socket */ 183 int LogPort; /* port number for INET connections */ 184 int Initialized = 0; /* set when we have initialized ourselves */ 185 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 186 int MarkSeq = 0; /* mark sequence number */ 187 188 extern int errno; 189 extern char *ctime(), *index(), *calloc(); 190 191 main(argc, argv) 192 int argc; 193 char **argv; 194 { 195 register int i; 196 register char *p; 197 int funix, inetm, fklog, klogm, len; 198 struct sockaddr_un sunx, fromunix; 199 struct sockaddr_in sin, frominet; 200 FILE *fp; 201 int ch; 202 char line[MSG_BSIZE + 1]; 203 extern int optind; 204 extern char *optarg; 205 void die(), domark(), init(), reapchild(); 206 207 while ((ch = getopt(argc, argv, "df:m:p:")) != EOF) 208 switch((char)ch) { 209 case 'd': /* debug */ 210 Debug++; 211 break; 212 case 'f': /* configuration file */ 213 ConfFile = optarg; 214 break; 215 case 'm': /* mark interval */ 216 MarkInterval = atoi(optarg) * 60; 217 break; 218 case 'p': /* path */ 219 LogName = optarg; 220 break; 221 case '?': 222 default: 223 usage(); 224 } 225 if (argc -= optind) 226 usage(); 227 228 if (!Debug) 229 daemon(0, 0); 230 else 231 setlinebuf(stdout); 232 233 consfile.f_type = F_CONSOLE; 234 (void) strcpy(consfile.f_un.f_fname, ctty); 235 (void) gethostname(LocalHostName, sizeof LocalHostName); 236 if (p = index(LocalHostName, '.')) { 237 *p++ = '\0'; 238 LocalDomain = p; 239 } 240 else 241 LocalDomain = ""; 242 (void) signal(SIGTERM, die); 243 (void) signal(SIGINT, Debug ? die : SIG_IGN); 244 (void) signal(SIGQUIT, Debug ? die : SIG_IGN); 245 (void) signal(SIGCHLD, reapchild); 246 (void) signal(SIGALRM, domark); 247 (void) alarm(TIMERINTVL); 248 (void) unlink(LogName); 249 250 bzero((char *)&sunx, sizeof(sunx)); 251 sunx.sun_family = AF_UNIX; 252 (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); 253 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 254 if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, 255 sizeof(sunx.sun_family)+sizeof(sunx.sun_len)+ 256 strlen(sunx.sun_path)) < 0 || 257 chmod(LogName, 0666) < 0) { 258 (void) sprintf(line, "cannot create %s", LogName); 259 logerror(line); 260 dprintf("cannot create %s (%d)\n", LogName, errno); 261 die(0); 262 } 263 finet = socket(AF_INET, SOCK_DGRAM, 0); 264 if (finet >= 0) { 265 struct servent *sp; 266 267 sp = getservbyname("syslog", "udp"); 268 if (sp == NULL) { 269 errno = 0; 270 logerror("syslog/udp: unknown service"); 271 die(0); 272 } 273 bzero((char *)&sin, sizeof(sin)); 274 sin.sin_family = AF_INET; 275 sin.sin_port = LogPort = sp->s_port; 276 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 277 logerror("bind"); 278 if (!Debug) 279 die(0); 280 } else { 281 inetm = FDMASK(finet); 282 InetInuse = 1; 283 } 284 } 285 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 286 klogm = FDMASK(fklog); 287 else { 288 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 289 klogm = 0; 290 } 291 292 /* tuck my process id away */ 293 fp = fopen(PidFile, "w"); 294 if (fp != NULL) { 295 fprintf(fp, "%d\n", getpid()); 296 (void) fclose(fp); 297 } 298 299 dprintf("off & running....\n"); 300 301 init(); 302 (void) signal(SIGHUP, init); 303 304 for (;;) { 305 int nfds, readfds = FDMASK(funix) | inetm | klogm; 306 307 errno = 0; 308 dprintf("readfds = %#x\n", readfds); 309 nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, 310 (fd_set *) NULL, (struct timeval *) NULL); 311 if (nfds == 0) 312 continue; 313 if (nfds < 0) { 314 if (errno != EINTR) 315 logerror("select"); 316 continue; 317 } 318 dprintf("got a message (%d, %#x)\n", nfds, readfds); 319 if (readfds & klogm) { 320 i = read(fklog, line, sizeof(line) - 1); 321 if (i > 0) { 322 line[i] = '\0'; 323 printsys(line); 324 } else if (i < 0 && errno != EINTR) { 325 logerror("klog"); 326 fklog = -1; 327 klogm = 0; 328 } 329 } 330 if (readfds & FDMASK(funix)) { 331 len = sizeof fromunix; 332 i = recvfrom(funix, line, MAXLINE, 0, 333 (struct sockaddr *) &fromunix, &len); 334 if (i > 0) { 335 line[i] = '\0'; 336 printline(LocalHostName, line); 337 } else if (i < 0 && errno != EINTR) 338 logerror("recvfrom unix"); 339 } 340 if (readfds & inetm) { 341 len = sizeof frominet; 342 i = recvfrom(finet, line, MAXLINE, 0, 343 (struct sockaddr *) &frominet, &len); 344 if (i > 0) { 345 extern char *cvthname(); 346 347 line[i] = '\0'; 348 printline(cvthname(&frominet), line); 349 } else if (i < 0 && errno != EINTR) 350 logerror("recvfrom inet"); 351 } 352 } 353 } 354 355 usage() 356 { 357 (void) fprintf(stderr, 358 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); 359 exit(1); 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 (iscntrl(c)) 398 if (c == '\n') 399 *q++ = ' '; 400 else if (c == '\t') 401 *q++ = '\t'; 402 else { 403 *q++ = '^'; 404 *q++ = c ^ 0100; 405 } 406 else 407 *q++ = c; 408 *q = '\0'; 409 410 logmsg(pri, line, hname, 0); 411 } 412 413 /* 414 * Take a raw input line from /dev/klog, split and format similar to syslog(). 415 */ 416 417 printsys(msg) 418 char *msg; 419 { 420 register char *p, *q; 421 register int c; 422 char line[MAXLINE + 1]; 423 int pri, flags; 424 char *lp; 425 426 (void) strcpy(line, _PATH_UNIX); 427 (void) strcat(line, ": "); 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 time_t time(); 470 471 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 472 pri, flags, from, msg); 473 474 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 475 476 /* 477 * Check to see if msg looks non-standard. 478 */ 479 msglen = strlen(msg); 480 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 481 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 482 flags |= ADDDATE; 483 484 (void) time(&now); 485 if (flags & ADDDATE) 486 timestamp = ctime(&now) + 4; 487 else { 488 timestamp = msg; 489 msg += 16; 490 msglen -= 16; 491 } 492 493 /* extract facility and priority level */ 494 if (flags & MARK) 495 fac = LOG_NFACILITIES; 496 else 497 fac = LOG_FAC(pri); 498 prilev = LOG_PRI(pri); 499 500 /* log the message to the particular outputs */ 501 if (!Initialized) { 502 f = &consfile; 503 f->f_file = open(ctty, O_WRONLY, 0); 504 505 if (f->f_file >= 0) { 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 || 515 f->f_pmask[fac] == INTERNAL_NOPRI) 516 continue; 517 518 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 519 continue; 520 521 /* don't output marks to recently written files */ 522 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 523 continue; 524 525 /* 526 * suppress duplicate lines to this file 527 */ 528 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 529 !strcmp(msg, f->f_prevline) && 530 !strcmp(from, f->f_prevhost)) { 531 (void) strncpy(f->f_lasttime, timestamp, 15); 532 f->f_prevcount++; 533 dprintf("msg repeated %d times, %ld sec of %d\n", 534 f->f_prevcount, now - f->f_time, 535 repeatinterval[f->f_repeatcount]); 536 /* 537 * If domark would have logged this by now, 538 * flush it now (so we don't hold isolated messages), 539 * but back off so we'll flush less often 540 * in the future. 541 */ 542 if (now > REPEATTIME(f)) { 543 fprintlog(f, flags, (char *)NULL); 544 BACKOFF(f); 545 } 546 } else { 547 /* new line, save it */ 548 if (f->f_prevcount) 549 fprintlog(f, 0, (char *)NULL); 550 f->f_repeatcount = 0; 551 (void) strncpy(f->f_lasttime, timestamp, 15); 552 (void) strncpy(f->f_prevhost, from, 553 sizeof(f->f_prevhost)); 554 if (msglen < MAXSVLINE) { 555 f->f_prevlen = msglen; 556 f->f_prevpri = pri; 557 (void) strcpy(f->f_prevline, msg); 558 fprintlog(f, flags, (char *)NULL); 559 } else { 560 f->f_prevline[0] = 0; 561 f->f_prevlen = 0; 562 fprintlog(f, flags, msg); 563 } 564 } 565 } 566 (void) sigsetmask(omask); 567 } 568 569 fprintlog(f, flags, msg) 570 register struct filed *f; 571 int flags; 572 char *msg; 573 { 574 struct iovec iov[6]; 575 register struct iovec *v; 576 register int l; 577 char line[MAXLINE + 1], repbuf[80], greetings[200]; 578 579 v = iov; 580 if (f->f_type == F_WALL) { 581 v->iov_base = greetings; 582 v->iov_len = sprintf(greetings, 583 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 584 f->f_prevhost, ctime(&now)); 585 v++; 586 v->iov_base = ""; 587 v->iov_len = 0; 588 v++; 589 } else { 590 v->iov_base = f->f_lasttime; 591 v->iov_len = 15; 592 v++; 593 v->iov_base = " "; 594 v->iov_len = 1; 595 v++; 596 } 597 v->iov_base = f->f_prevhost; 598 v->iov_len = strlen(v->iov_base); 599 v++; 600 v->iov_base = " "; 601 v->iov_len = 1; 602 v++; 603 604 if (msg) { 605 v->iov_base = msg; 606 v->iov_len = strlen(msg); 607 } else if (f->f_prevcount > 1) { 608 v->iov_base = repbuf; 609 v->iov_len = sprintf(repbuf, "last message repeated %d times", 610 f->f_prevcount); 611 } else { 612 v->iov_base = f->f_prevline; 613 v->iov_len = f->f_prevlen; 614 } 615 v++; 616 617 dprintf("Logging to %s", TypeNames[f->f_type]); 618 f->f_time = now; 619 620 switch (f->f_type) { 621 case F_UNUSED: 622 dprintf("\n"); 623 break; 624 625 case F_FORW: 626 dprintf(" %s\n", f->f_un.f_forw.f_hname); 627 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 628 iov[0].iov_base, iov[4].iov_base); 629 if (l > MAXLINE) 630 l = MAXLINE; 631 if (sendto(finet, line, l, 0, 632 (struct sockaddr *)&f->f_un.f_forw.f_addr, 633 sizeof f->f_un.f_forw.f_addr) != l) { 634 int e = errno; 635 (void) close(f->f_file); 636 f->f_type = F_UNUSED; 637 errno = e; 638 logerror("sendto"); 639 } 640 break; 641 642 case F_CONSOLE: 643 if (flags & IGN_CONS) { 644 dprintf(" (ignored)\n"); 645 break; 646 } 647 /* FALLTHROUGH */ 648 649 case F_TTY: 650 case F_FILE: 651 dprintf(" %s\n", f->f_un.f_fname); 652 if (f->f_type != F_FILE) { 653 v->iov_base = "\r\n"; 654 v->iov_len = 2; 655 } else { 656 v->iov_base = "\n"; 657 v->iov_len = 1; 658 } 659 again: 660 if (writev(f->f_file, iov, 6) < 0) { 661 int e = errno; 662 (void) close(f->f_file); 663 /* 664 * Check for errors on TTY's due to loss of tty 665 */ 666 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 667 f->f_file = open(f->f_un.f_fname, 668 O_WRONLY|O_APPEND, 0); 669 if (f->f_file < 0) { 670 f->f_type = F_UNUSED; 671 logerror(f->f_un.f_fname); 672 } else 673 goto again; 674 } else { 675 f->f_type = F_UNUSED; 676 errno = e; 677 logerror(f->f_un.f_fname); 678 } 679 } else if (flags & SYNC_FILE) 680 (void) fsync(f->f_file); 681 break; 682 683 case F_USERS: 684 case F_WALL: 685 dprintf("\n"); 686 v->iov_base = "\r\n"; 687 v->iov_len = 2; 688 wallmsg(f, iov); 689 break; 690 } 691 f->f_prevcount = 0; 692 } 693 694 /* 695 * WALLMSG -- Write a message to the world at large 696 * 697 * Write the specified message to either the entire 698 * world, or a list of approved users. 699 */ 700 701 wallmsg(f, iov) 702 register struct filed *f; 703 struct iovec *iov; 704 { 705 static int reenter; /* avoid calling ourselves */ 706 register FILE *uf; 707 register int i; 708 struct utmp ut; 709 char *p, *ttymsg(); 710 711 if (reenter++) 712 return; 713 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 714 logerror(_PATH_UTMP); 715 reenter = 0; 716 return; 717 } 718 /* NOSTRICT */ 719 while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { 720 if (ut.ut_name[0] == '\0') 721 continue; 722 if (f->f_type == F_WALL) { 723 if (p = ttymsg(iov, 6, ut.ut_line, 1)) { 724 errno = 0; /* already in msg */ 725 logerror(p); 726 } 727 continue; 728 } 729 /* should we send the message to this user? */ 730 for (i = 0; i < MAXUNAMES; i++) { 731 if (!f->f_un.f_uname[i][0]) 732 break; 733 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 734 UT_NAMESIZE)) { 735 if (p = ttymsg(iov, 6, ut.ut_line, 1)) { 736 errno = 0; /* already in msg */ 737 logerror(p); 738 } 739 break; 740 } 741 } 742 } 743 (void) fclose(uf); 744 reenter = 0; 745 } 746 747 void 748 reapchild() 749 { 750 union wait status; 751 752 while (wait3((int *)&status, WNOHANG, (struct rusage *) NULL) > 0) 753 ; 754 } 755 756 /* 757 * Return a printable representation of a host address. 758 */ 759 char * 760 cvthname(f) 761 struct sockaddr_in *f; 762 { 763 struct hostent *hp; 764 register char *p; 765 extern char *inet_ntoa(); 766 767 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 768 769 if (f->sin_family != AF_INET) { 770 dprintf("Malformed from address\n"); 771 return ("???"); 772 } 773 hp = gethostbyaddr((char *)&f->sin_addr, 774 sizeof(struct in_addr), f->sin_family); 775 if (hp == 0) { 776 dprintf("Host name for your address (%s) unknown\n", 777 inet_ntoa(f->sin_addr)); 778 return (inet_ntoa(f->sin_addr)); 779 } 780 if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 781 *p = '\0'; 782 return (hp->h_name); 783 } 784 785 void 786 domark() 787 { 788 register struct filed *f; 789 time_t time(); 790 791 now = time((time_t *)NULL); 792 MarkSeq += TIMERINTVL; 793 if (MarkSeq >= MarkInterval) { 794 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 795 MarkSeq = 0; 796 } 797 798 for (f = Files; f; f = f->f_next) { 799 if (f->f_prevcount && now >= REPEATTIME(f)) { 800 dprintf("flush %s: repeated %d times, %d sec.\n", 801 TypeNames[f->f_type], f->f_prevcount, 802 repeatinterval[f->f_repeatcount]); 803 fprintlog(f, 0, (char *)NULL); 804 BACKOFF(f); 805 } 806 } 807 (void) alarm(TIMERINTVL); 808 } 809 810 /* 811 * Print syslogd errors some place. 812 */ 813 logerror(type) 814 char *type; 815 { 816 char buf[100], *strerror(); 817 818 if (errno) 819 (void) sprintf(buf, "syslogd: %s: %s", type, strerror(errno)); 820 else 821 (void) sprintf(buf, "syslogd: %s", type); 822 errno = 0; 823 dprintf("%s\n", buf); 824 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 825 } 826 827 void 828 die(sig) 829 { 830 register struct filed *f; 831 char buf[100]; 832 833 for (f = Files; f != NULL; f = f->f_next) { 834 /* flush any pending output */ 835 if (f->f_prevcount) 836 fprintlog(f, 0, (char *)NULL); 837 } 838 if (sig) { 839 dprintf("syslogd: exiting on signal %d\n", sig); 840 (void) sprintf(buf, "exiting on signal %d", sig); 841 errno = 0; 842 logerror(buf); 843 } 844 (void) unlink(LogName); 845 exit(0); 846 } 847 848 /* 849 * INIT -- Initialize syslogd from configuration table 850 */ 851 852 void 853 init() 854 { 855 register int i; 856 register FILE *cf; 857 register struct filed *f, *next, **nextp; 858 register char *p; 859 char cline[BUFSIZ]; 860 861 dprintf("init\n"); 862 863 /* 864 * Close all open log files. 865 */ 866 Initialized = 0; 867 for (f = Files; f != NULL; f = next) { 868 /* flush any pending output */ 869 if (f->f_prevcount) 870 fprintlog(f, 0, (char *)NULL); 871 872 switch (f->f_type) { 873 case F_FILE: 874 case F_TTY: 875 case F_CONSOLE: 876 case F_FORW: 877 (void) close(f->f_file); 878 break; 879 } 880 next = f->f_next; 881 free((char *) f); 882 } 883 Files = NULL; 884 nextp = &Files; 885 886 /* open the configuration file */ 887 if ((cf = fopen(ConfFile, "r")) == NULL) { 888 dprintf("cannot open %s\n", ConfFile); 889 *nextp = (struct filed *)calloc(1, sizeof(*f)); 890 cfline("*.ERR\t/dev/console", *nextp); 891 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 892 cfline("*.PANIC\t*", (*nextp)->f_next); 893 Initialized = 1; 894 return; 895 } 896 897 /* 898 * Foreach line in the conf table, open that file. 899 */ 900 f = NULL; 901 while (fgets(cline, sizeof cline, cf) != NULL) { 902 /* 903 * check for end-of-section, comments, strip off trailing 904 * spaces and newline character. 905 */ 906 for (p = cline; isspace(*p); ++p); 907 if (*p == NULL || *p == '#') 908 continue; 909 for (p = index(cline, '\0'); isspace(*--p);); 910 *++p = '\0'; 911 f = (struct filed *)calloc(1, sizeof(*f)); 912 *nextp = f; 913 nextp = &f->f_next; 914 cfline(cline, f); 915 } 916 917 /* close the configuration file */ 918 (void) fclose(cf); 919 920 Initialized = 1; 921 922 if (Debug) { 923 for (f = Files; f; f = f->f_next) { 924 for (i = 0; i <= LOG_NFACILITIES; i++) 925 if (f->f_pmask[i] == INTERNAL_NOPRI) 926 printf("X "); 927 else 928 printf("%d ", f->f_pmask[i]); 929 printf("%s: ", TypeNames[f->f_type]); 930 switch (f->f_type) { 931 case F_FILE: 932 case F_TTY: 933 case F_CONSOLE: 934 printf("%s", f->f_un.f_fname); 935 break; 936 937 case F_FORW: 938 printf("%s", f->f_un.f_forw.f_hname); 939 break; 940 941 case F_USERS: 942 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 943 printf("%s, ", f->f_un.f_uname[i]); 944 break; 945 } 946 printf("\n"); 947 } 948 } 949 950 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 951 dprintf("syslogd: restarted\n"); 952 } 953 954 /* 955 * Crack a configuration file line 956 */ 957 958 cfline(line, f) 959 char *line; 960 register struct filed *f; 961 { 962 register char *p; 963 register char *q; 964 register int i; 965 char *bp; 966 int pri; 967 struct hostent *hp; 968 char buf[MAXLINE], ebuf[100]; 969 970 dprintf("cfline(%s)\n", line); 971 972 errno = 0; /* keep strerror() stuff out of logerror messages */ 973 974 /* clear out file entry */ 975 bzero((char *) f, sizeof *f); 976 for (i = 0; i <= LOG_NFACILITIES; i++) 977 f->f_pmask[i] = INTERNAL_NOPRI; 978 979 /* scan through the list of selectors */ 980 for (p = line; *p && *p != '\t';) { 981 982 /* find the end of this facility name list */ 983 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 984 continue; 985 986 /* collect priority name */ 987 for (bp = buf; *q && !index("\t,;", *q); ) 988 *bp++ = *q++; 989 *bp = '\0'; 990 991 /* skip cruft */ 992 while (index(", ;", *q)) 993 q++; 994 995 /* decode priority name */ 996 if (*buf == '*') 997 pri = LOG_PRIMASK + 1; 998 else { 999 pri = decode(buf, prioritynames); 1000 if (pri < 0) { 1001 (void) sprintf(ebuf, 1002 "unknown priority name \"%s\"", buf); 1003 logerror(ebuf); 1004 return; 1005 } 1006 } 1007 1008 /* scan facilities */ 1009 while (*p && !index("\t.;", *p)) { 1010 for (bp = buf; *p && !index("\t,;.", *p); ) 1011 *bp++ = *p++; 1012 *bp = '\0'; 1013 if (*buf == '*') 1014 for (i = 0; i < LOG_NFACILITIES; i++) 1015 f->f_pmask[i] = pri; 1016 else { 1017 i = decode(buf, facilitynames); 1018 if (i < 0) { 1019 (void) sprintf(ebuf, 1020 "unknown facility name \"%s\"", 1021 buf); 1022 logerror(ebuf); 1023 return; 1024 } 1025 f->f_pmask[i >> 3] = pri; 1026 } 1027 while (*p == ',' || *p == ' ') 1028 p++; 1029 } 1030 1031 p = q; 1032 } 1033 1034 /* skip to action part */ 1035 while (*p == '\t') 1036 p++; 1037 1038 switch (*p) 1039 { 1040 case '@': 1041 if (!InetInuse) 1042 break; 1043 (void) strcpy(f->f_un.f_forw.f_hname, ++p); 1044 hp = gethostbyname(p); 1045 if (hp == NULL) { 1046 extern int h_errno, h_nerr; 1047 extern char **h_errlist; 1048 1049 logerror((u_int)h_errno < h_nerr ? 1050 h_errlist[h_errno] : "Unknown error"); 1051 break; 1052 } 1053 bzero((char *) &f->f_un.f_forw.f_addr, 1054 sizeof f->f_un.f_forw.f_addr); 1055 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1056 f->f_un.f_forw.f_addr.sin_port = LogPort; 1057 bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length); 1058 f->f_type = F_FORW; 1059 break; 1060 1061 case '/': 1062 (void) strcpy(f->f_un.f_fname, p); 1063 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1064 f->f_file = F_UNUSED; 1065 logerror(p); 1066 break; 1067 } 1068 if (isatty(f->f_file)) 1069 f->f_type = F_TTY; 1070 else 1071 f->f_type = F_FILE; 1072 if (strcmp(p, ctty) == 0) 1073 f->f_type = F_CONSOLE; 1074 break; 1075 1076 case '*': 1077 f->f_type = F_WALL; 1078 break; 1079 1080 default: 1081 for (i = 0; i < MAXUNAMES && *p; i++) { 1082 for (q = p; *q && *q != ','; ) 1083 q++; 1084 (void) strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1085 if ((q - p) > UT_NAMESIZE) 1086 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1087 else 1088 f->f_un.f_uname[i][q - p] = '\0'; 1089 while (*q == ',' || *q == ' ') 1090 q++; 1091 p = q; 1092 } 1093 f->f_type = F_USERS; 1094 break; 1095 } 1096 } 1097 1098 1099 /* 1100 * Decode a symbolic name to a numeric value 1101 */ 1102 1103 decode(name, codetab) 1104 char *name; 1105 CODE *codetab; 1106 { 1107 register CODE *c; 1108 register char *p; 1109 char buf[40]; 1110 1111 if (isdigit(*name)) 1112 return (atoi(name)); 1113 1114 (void) strcpy(buf, name); 1115 for (p = buf; *p; p++) 1116 if (isupper(*p)) 1117 *p = tolower(*p); 1118 for (c = codetab; c->c_name; c++) 1119 if (!strcmp(buf, c->c_name)) 1120 return (c->c_val); 1121 1122 return (-1); 1123 } 1124