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[] = "@(#)syslogd.c 5.45 (Berkeley) 3/2/91"; 42 #endif /* not lint */ 43 44 /* 45 * syslogd -- log system messages 46 * 47 * This program implements a system log. It takes a series of lines. 48 * Each line may have a priority, signified as "<n>" as 49 * the first characters of the line. If this is 50 * not present, a default priority is used. 51 * 52 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 53 * cause it to reread its configuration file. 54 * 55 * Defined Constants: 56 * 57 * MAXLINE -- the maximimum line length that can be handled. 58 * DEFUPRI -- the default priority for user messages 59 * DEFSPRI -- the default priority for kernel messages 60 * 61 * Author: Eric Allman 62 * extensive changes by Ralph Campbell 63 * more extensive changes by Eric Allman (again) 64 */ 65 66 #define MAXLINE 1024 /* maximum line length */ 67 #define MAXSVLINE 120 /* maximum saved line length */ 68 #define DEFUPRI (LOG_USER|LOG_NOTICE) 69 #define DEFSPRI (LOG_KERN|LOG_CRIT) 70 #define TIMERINTVL 30 /* interval for checking flush, mark */ 71 72 #include <sys/param.h> 73 #include <sys/errno.h> 74 #include <sys/ioctl.h> 75 #include <sys/stat.h> 76 #include <sys/wait.h> 77 #include <sys/socket.h> 78 #include <sys/file.h> 79 #include <sys/msgbuf.h> 80 #include <sys/uio.h> 81 #include <sys/un.h> 82 #include <sys/time.h> 83 #include <sys/resource.h> 84 #include <sys/signal.h> 85 86 #include <netinet/in.h> 87 #include <netdb.h> 88 89 #include <utmp.h> 90 #include <setjmp.h> 91 #include <stdio.h> 92 #include <ctype.h> 93 #include <string.h> 94 #include <unistd.h> 95 #include "pathnames.h" 96 97 #define SYSLOG_NAMES 98 #include <sys/syslog.h> 99 100 char *LogName = _PATH_LOG; 101 char *ConfFile = _PATH_LOGCONF; 102 char *PidFile = _PATH_LOGPID; 103 char ctty[] = _PATH_CONSOLE; 104 105 #define FDMASK(fd) (1 << (fd)) 106 107 #define dprintf if (Debug) printf 108 109 #define MAXUNAMES 20 /* maximum number of user names */ 110 111 /* 112 * Flags to logmsg(). 113 */ 114 115 #define IGN_CONS 0x001 /* don't print on console */ 116 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 117 #define ADDDATE 0x004 /* add a date to the message */ 118 #define MARK 0x008 /* this message is a mark */ 119 120 /* 121 * This structure represents the files that will have log 122 * copies printed. 123 */ 124 125 struct filed { 126 struct filed *f_next; /* next in linked list */ 127 short f_type; /* entry type, see below */ 128 short f_file; /* file descriptor */ 129 time_t f_time; /* time this was last written */ 130 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 131 union { 132 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 133 struct { 134 char f_hname[MAXHOSTNAMELEN+1]; 135 struct sockaddr_in f_addr; 136 } f_forw; /* forwarding address */ 137 char f_fname[MAXPATHLEN]; 138 } f_un; 139 char f_prevline[MAXSVLINE]; /* last message logged */ 140 char f_lasttime[16]; /* time of last occurrence */ 141 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 142 int f_prevpri; /* pri of f_prevline */ 143 int f_prevlen; /* length of f_prevline */ 144 int f_prevcount; /* repetition cnt of prevline */ 145 int f_repeatcount; /* number of "repeated" msgs */ 146 }; 147 148 /* 149 * Intervals at which we flush out "message repeated" messages, 150 * in seconds after previous message is logged. After each flush, 151 * we move to the next interval until we reach the largest. 152 */ 153 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 154 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 155 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 156 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 157 (f)->f_repeatcount = MAXREPEAT; \ 158 } 159 160 /* values for f_type */ 161 #define F_UNUSED 0 /* unused entry */ 162 #define F_FILE 1 /* regular file */ 163 #define F_TTY 2 /* terminal */ 164 #define F_CONSOLE 3 /* console terminal */ 165 #define F_FORW 4 /* remote machine */ 166 #define F_USERS 5 /* list of users */ 167 #define F_WALL 6 /* everyone logged on */ 168 169 char *TypeNames[7] = { 170 "UNUSED", "FILE", "TTY", "CONSOLE", 171 "FORW", "USERS", "WALL" 172 }; 173 174 struct filed *Files; 175 struct filed consfile; 176 177 int Debug; /* debug flag */ 178 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 179 char *LocalDomain; /* our local domain name */ 180 int InetInuse = 0; /* non-zero if INET sockets are being used */ 181 int finet; /* Internet datagram socket */ 182 int LogPort; /* port number for INET connections */ 183 int Initialized = 0; /* set when we have initialized ourselves */ 184 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 185 int MarkSeq = 0; /* mark sequence number */ 186 187 extern int errno; 188 extern char *ctime(), *index(), *calloc(); 189 190 main(argc, argv) 191 int argc; 192 char **argv; 193 { 194 register int i; 195 register char *p; 196 int funix, inetm, fklog, klogm, len; 197 struct sockaddr_un sunx, fromunix; 198 struct sockaddr_in sin, frominet; 199 FILE *fp; 200 int ch; 201 char line[MSG_BSIZE + 1]; 202 extern int optind; 203 extern char *optarg; 204 void die(), domark(), init(), reapchild(); 205 206 while ((ch = getopt(argc, argv, "df:m:p:")) != EOF) 207 switch((char)ch) { 208 case 'd': /* debug */ 209 Debug++; 210 break; 211 case 'f': /* configuration file */ 212 ConfFile = optarg; 213 break; 214 case 'm': /* mark interval */ 215 MarkInterval = atoi(optarg) * 60; 216 break; 217 case 'p': /* path */ 218 LogName = optarg; 219 break; 220 case '?': 221 default: 222 usage(); 223 } 224 if (argc -= optind) 225 usage(); 226 227 if (!Debug) 228 daemon(0, 0); 229 else 230 setlinebuf(stdout); 231 232 consfile.f_type = F_CONSOLE; 233 (void) strcpy(consfile.f_un.f_fname, ctty); 234 (void) gethostname(LocalHostName, sizeof LocalHostName); 235 if (p = index(LocalHostName, '.')) { 236 *p++ = '\0'; 237 LocalDomain = p; 238 } 239 else 240 LocalDomain = ""; 241 (void) signal(SIGTERM, die); 242 (void) signal(SIGINT, Debug ? die : SIG_IGN); 243 (void) signal(SIGQUIT, Debug ? die : SIG_IGN); 244 (void) signal(SIGCHLD, reapchild); 245 (void) signal(SIGALRM, domark); 246 (void) alarm(TIMERINTVL); 247 (void) unlink(LogName); 248 249 bzero((char *)&sunx, sizeof(sunx)); 250 sunx.sun_family = AF_UNIX; 251 (void) strncpy(sunx.sun_path, LogName, sizeof sunx.sun_path); 252 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 253 if (funix < 0 || bind(funix, (struct sockaddr *) &sunx, 254 sizeof(sunx.sun_family)+sizeof(sunx.sun_len)+ 255 strlen(sunx.sun_path)) < 0 || 256 chmod(LogName, 0666) < 0) { 257 (void) sprintf(line, "cannot create %s", LogName); 258 logerror(line); 259 dprintf("cannot create %s (%d)\n", LogName, errno); 260 die(0); 261 } 262 finet = socket(AF_INET, SOCK_DGRAM, 0); 263 if (finet >= 0) { 264 struct servent *sp; 265 266 sp = getservbyname("syslog", "udp"); 267 if (sp == NULL) { 268 errno = 0; 269 logerror("syslog/udp: unknown service"); 270 die(0); 271 } 272 bzero((char *)&sin, sizeof(sin)); 273 sin.sin_family = AF_INET; 274 sin.sin_port = LogPort = sp->s_port; 275 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 276 logerror("bind"); 277 if (!Debug) 278 die(0); 279 } else { 280 inetm = FDMASK(finet); 281 InetInuse = 1; 282 } 283 } 284 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 285 klogm = FDMASK(fklog); 286 else { 287 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 288 klogm = 0; 289 } 290 291 /* tuck my process id away */ 292 fp = fopen(PidFile, "w"); 293 if (fp != NULL) { 294 fprintf(fp, "%d\n", getpid()); 295 (void) fclose(fp); 296 } 297 298 dprintf("off & running....\n"); 299 300 init(); 301 (void) signal(SIGHUP, init); 302 303 for (;;) { 304 int nfds, readfds = FDMASK(funix) | inetm | klogm; 305 306 errno = 0; 307 dprintf("readfds = %#x\n", readfds); 308 nfds = select(20, (fd_set *) &readfds, (fd_set *) NULL, 309 (fd_set *) NULL, (struct timeval *) NULL); 310 if (nfds == 0) 311 continue; 312 if (nfds < 0) { 313 if (errno != EINTR) 314 logerror("select"); 315 continue; 316 } 317 dprintf("got a message (%d, %#x)\n", nfds, readfds); 318 if (readfds & klogm) { 319 i = read(fklog, line, sizeof(line) - 1); 320 if (i > 0) { 321 line[i] = '\0'; 322 printsys(line); 323 } else if (i < 0 && errno != EINTR) { 324 logerror("klog"); 325 fklog = -1; 326 klogm = 0; 327 } 328 } 329 if (readfds & FDMASK(funix)) { 330 len = sizeof fromunix; 331 i = recvfrom(funix, line, MAXLINE, 0, 332 (struct sockaddr *) &fromunix, &len); 333 if (i > 0) { 334 line[i] = '\0'; 335 printline(LocalHostName, line); 336 } else if (i < 0 && errno != EINTR) 337 logerror("recvfrom unix"); 338 } 339 if (readfds & inetm) { 340 len = sizeof frominet; 341 i = recvfrom(finet, line, MAXLINE, 0, 342 (struct sockaddr *) &frominet, &len); 343 if (i > 0) { 344 extern char *cvthname(); 345 346 line[i] = '\0'; 347 printline(cvthname(&frominet), line); 348 } else if (i < 0 && errno != EINTR) 349 logerror("recvfrom inet"); 350 } 351 } 352 } 353 354 usage() 355 { 356 (void) fprintf(stderr, 357 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); 358 exit(1); 359 } 360 361 /* 362 * Take a raw input line, decode the message, and print the message 363 * on the appropriate log files. 364 */ 365 366 printline(hname, msg) 367 char *hname; 368 char *msg; 369 { 370 register char *p, *q; 371 register int c; 372 char line[MAXLINE + 1]; 373 int pri; 374 375 /* test for special codes */ 376 pri = DEFUPRI; 377 p = msg; 378 if (*p == '<') { 379 pri = 0; 380 while (isdigit(*++p)) 381 pri = 10 * pri + (*p - '0'); 382 if (*p == '>') 383 ++p; 384 } 385 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 386 pri = DEFUPRI; 387 388 /* don't allow users to log kernel messages */ 389 if (LOG_FAC(pri) == LOG_KERN) 390 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 391 392 q = line; 393 394 while ((c = *p++ & 0177) != '\0' && 395 q < &line[sizeof(line) - 1]) 396 if (iscntrl(c)) 397 if (c == '\n') 398 *q++ = ' '; 399 else if (c == '\t') 400 *q++ = '\t'; 401 else { 402 *q++ = '^'; 403 *q++ = c ^ 0100; 404 } 405 else 406 *q++ = c; 407 *q = '\0'; 408 409 logmsg(pri, line, hname, 0); 410 } 411 412 /* 413 * Take a raw input line from /dev/klog, split and format similar to syslog(). 414 */ 415 416 printsys(msg) 417 char *msg; 418 { 419 register char *p, *q; 420 register int c; 421 char line[MAXLINE + 1]; 422 int pri, flags; 423 char *lp; 424 425 (void) strcpy(line, _PATH_UNIX); 426 (void) strcat(line, ": "); 427 lp = line + strlen(line); 428 for (p = msg; *p != '\0'; ) { 429 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 430 pri = DEFSPRI; 431 if (*p == '<') { 432 pri = 0; 433 while (isdigit(*++p)) 434 pri = 10 * pri + (*p - '0'); 435 if (*p == '>') 436 ++p; 437 } else { 438 /* kernel printf's come out on console */ 439 flags |= IGN_CONS; 440 } 441 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 442 pri = DEFSPRI; 443 q = lp; 444 while (*p != '\0' && (c = *p++) != '\n' && 445 q < &line[MAXLINE]) 446 *q++ = c; 447 *q = '\0'; 448 logmsg(pri, line, LocalHostName, flags); 449 } 450 } 451 452 time_t now; 453 454 /* 455 * Log a message to the appropriate log files, users, etc. based on 456 * the priority. 457 */ 458 459 logmsg(pri, msg, from, flags) 460 int pri; 461 char *msg, *from; 462 int flags; 463 { 464 register struct filed *f; 465 int fac, prilev; 466 int omask, msglen; 467 char *timestamp; 468 time_t time(); 469 470 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 471 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, 0); 503 504 if (f->f_file >= 0) { 505 fprintlog(f, flags, msg); 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 || 514 f->f_pmask[fac] == INTERNAL_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; 575 register int l; 576 char line[MAXLINE + 1], repbuf[80], greetings[200]; 577 578 v = iov; 579 if (f->f_type == F_WALL) { 580 v->iov_base = greetings; 581 v->iov_len = sprintf(greetings, 582 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 583 f->f_prevhost, ctime(&now)); 584 v++; 585 v->iov_base = ""; 586 v->iov_len = 0; 587 v++; 588 } else { 589 v->iov_base = f->f_lasttime; 590 v->iov_len = 15; 591 v++; 592 v->iov_base = " "; 593 v->iov_len = 1; 594 v++; 595 } 596 v->iov_base = f->f_prevhost; 597 v->iov_len = strlen(v->iov_base); 598 v++; 599 v->iov_base = " "; 600 v->iov_len = 1; 601 v++; 602 603 if (msg) { 604 v->iov_base = msg; 605 v->iov_len = strlen(msg); 606 } else if (f->f_prevcount > 1) { 607 v->iov_base = repbuf; 608 v->iov_len = sprintf(repbuf, "last message repeated %d times", 609 f->f_prevcount); 610 } else { 611 v->iov_base = f->f_prevline; 612 v->iov_len = f->f_prevlen; 613 } 614 v++; 615 616 dprintf("Logging to %s", TypeNames[f->f_type]); 617 f->f_time = now; 618 619 switch (f->f_type) { 620 case F_UNUSED: 621 dprintf("\n"); 622 break; 623 624 case F_FORW: 625 dprintf(" %s\n", f->f_un.f_forw.f_hname); 626 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 627 iov[0].iov_base, iov[4].iov_base); 628 if (l > MAXLINE) 629 l = MAXLINE; 630 if (sendto(finet, line, l, 0, 631 (struct sockaddr *)&f->f_un.f_forw.f_addr, 632 sizeof f->f_un.f_forw.f_addr) != l) { 633 int e = errno; 634 (void) close(f->f_file); 635 f->f_type = F_UNUSED; 636 errno = e; 637 logerror("sendto"); 638 } 639 break; 640 641 case F_CONSOLE: 642 if (flags & IGN_CONS) { 643 dprintf(" (ignored)\n"); 644 break; 645 } 646 /* FALLTHROUGH */ 647 648 case F_TTY: 649 case F_FILE: 650 dprintf(" %s\n", f->f_un.f_fname); 651 if (f->f_type != F_FILE) { 652 v->iov_base = "\r\n"; 653 v->iov_len = 2; 654 } else { 655 v->iov_base = "\n"; 656 v->iov_len = 1; 657 } 658 again: 659 if (writev(f->f_file, iov, 6) < 0) { 660 int e = errno; 661 (void) close(f->f_file); 662 /* 663 * Check for errors on TTY's due to loss of tty 664 */ 665 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 666 f->f_file = open(f->f_un.f_fname, 667 O_WRONLY|O_APPEND, 0); 668 if (f->f_file < 0) { 669 f->f_type = F_UNUSED; 670 logerror(f->f_un.f_fname); 671 } else 672 goto again; 673 } else { 674 f->f_type = F_UNUSED; 675 errno = e; 676 logerror(f->f_un.f_fname); 677 } 678 } else if (flags & SYNC_FILE) 679 (void) fsync(f->f_file); 680 break; 681 682 case F_USERS: 683 case F_WALL: 684 dprintf("\n"); 685 v->iov_base = "\r\n"; 686 v->iov_len = 2; 687 wallmsg(f, iov); 688 break; 689 } 690 f->f_prevcount = 0; 691 } 692 693 /* 694 * WALLMSG -- Write a message to the world at large 695 * 696 * Write the specified message to either the entire 697 * world, or a list of approved users. 698 */ 699 700 wallmsg(f, iov) 701 register struct filed *f; 702 struct iovec *iov; 703 { 704 static int reenter; /* avoid calling ourselves */ 705 register FILE *uf; 706 register int i; 707 struct utmp ut; 708 char *p, *ttymsg(); 709 710 if (reenter++) 711 return; 712 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 713 logerror(_PATH_UTMP); 714 reenter = 0; 715 return; 716 } 717 /* NOSTRICT */ 718 while (fread((char *) &ut, sizeof ut, 1, uf) == 1) { 719 if (ut.ut_name[0] == '\0') 720 continue; 721 if (f->f_type == F_WALL) { 722 if (p = ttymsg(iov, 6, ut.ut_line, 1)) { 723 errno = 0; /* already in msg */ 724 logerror(p); 725 } 726 continue; 727 } 728 /* should we send the message to this user? */ 729 for (i = 0; i < MAXUNAMES; i++) { 730 if (!f->f_un.f_uname[i][0]) 731 break; 732 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 733 UT_NAMESIZE)) { 734 if (p = ttymsg(iov, 6, ut.ut_line, 1)) { 735 errno = 0; /* already in msg */ 736 logerror(p); 737 } 738 break; 739 } 740 } 741 } 742 (void) fclose(uf); 743 reenter = 0; 744 } 745 746 void 747 reapchild() 748 { 749 union wait status; 750 751 while (wait3((int *)&status, WNOHANG, (struct rusage *) NULL) > 0) 752 ; 753 } 754 755 /* 756 * Return a printable representation of a host address. 757 */ 758 char * 759 cvthname(f) 760 struct sockaddr_in *f; 761 { 762 struct hostent *hp; 763 register char *p; 764 extern char *inet_ntoa(); 765 766 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 767 768 if (f->sin_family != AF_INET) { 769 dprintf("Malformed from address\n"); 770 return ("???"); 771 } 772 hp = gethostbyaddr((char *)&f->sin_addr, 773 sizeof(struct in_addr), f->sin_family); 774 if (hp == 0) { 775 dprintf("Host name for your address (%s) unknown\n", 776 inet_ntoa(f->sin_addr)); 777 return (inet_ntoa(f->sin_addr)); 778 } 779 if ((p = index(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 780 *p = '\0'; 781 return (hp->h_name); 782 } 783 784 void 785 domark() 786 { 787 register struct filed *f; 788 time_t time(); 789 790 now = time((time_t *)NULL); 791 MarkSeq += TIMERINTVL; 792 if (MarkSeq >= MarkInterval) { 793 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 794 MarkSeq = 0; 795 } 796 797 for (f = Files; f; f = f->f_next) { 798 if (f->f_prevcount && now >= REPEATTIME(f)) { 799 dprintf("flush %s: repeated %d times, %d sec.\n", 800 TypeNames[f->f_type], f->f_prevcount, 801 repeatinterval[f->f_repeatcount]); 802 fprintlog(f, 0, (char *)NULL); 803 BACKOFF(f); 804 } 805 } 806 (void) alarm(TIMERINTVL); 807 } 808 809 /* 810 * Print syslogd errors some place. 811 */ 812 logerror(type) 813 char *type; 814 { 815 char buf[100], *strerror(); 816 817 if (errno) 818 (void) sprintf(buf, "syslogd: %s: %s", type, strerror(errno)); 819 else 820 (void) sprintf(buf, "syslogd: %s", type); 821 errno = 0; 822 dprintf("%s\n", buf); 823 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 824 } 825 826 void 827 die(sig) 828 { 829 register struct filed *f; 830 char buf[100]; 831 832 for (f = Files; f != NULL; f = f->f_next) { 833 /* flush any pending output */ 834 if (f->f_prevcount) 835 fprintlog(f, 0, (char *)NULL); 836 } 837 if (sig) { 838 dprintf("syslogd: exiting on signal %d\n", sig); 839 (void) sprintf(buf, "exiting on signal %d", sig); 840 errno = 0; 841 logerror(buf); 842 } 843 (void) unlink(LogName); 844 exit(0); 845 } 846 847 /* 848 * INIT -- Initialize syslogd from configuration table 849 */ 850 851 void 852 init() 853 { 854 register int i; 855 register FILE *cf; 856 register struct filed *f, *next, **nextp; 857 register char *p; 858 char cline[BUFSIZ]; 859 860 dprintf("init\n"); 861 862 /* 863 * Close all open log files. 864 */ 865 Initialized = 0; 866 for (f = Files; f != NULL; f = next) { 867 /* flush any pending output */ 868 if (f->f_prevcount) 869 fprintlog(f, 0, (char *)NULL); 870 871 switch (f->f_type) { 872 case F_FILE: 873 case F_TTY: 874 case F_CONSOLE: 875 case F_FORW: 876 (void) close(f->f_file); 877 break; 878 } 879 next = f->f_next; 880 free((char *) f); 881 } 882 Files = NULL; 883 nextp = &Files; 884 885 /* open the configuration file */ 886 if ((cf = fopen(ConfFile, "r")) == NULL) { 887 dprintf("cannot open %s\n", ConfFile); 888 *nextp = (struct filed *)calloc(1, sizeof(*f)); 889 cfline("*.ERR\t/dev/console", *nextp); 890 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 891 cfline("*.PANIC\t*", (*nextp)->f_next); 892 Initialized = 1; 893 return; 894 } 895 896 /* 897 * Foreach line in the conf table, open that file. 898 */ 899 f = NULL; 900 while (fgets(cline, sizeof cline, cf) != NULL) { 901 /* 902 * check for end-of-section, comments, strip off trailing 903 * spaces and newline character. 904 */ 905 for (p = cline; isspace(*p); ++p); 906 if (*p == NULL || *p == '#') 907 continue; 908 for (p = index(cline, '\0'); isspace(*--p);); 909 *++p = '\0'; 910 f = (struct filed *)calloc(1, sizeof(*f)); 911 *nextp = f; 912 nextp = &f->f_next; 913 cfline(cline, f); 914 } 915 916 /* close the configuration file */ 917 (void) fclose(cf); 918 919 Initialized = 1; 920 921 if (Debug) { 922 for (f = Files; f; f = f->f_next) { 923 for (i = 0; i <= LOG_NFACILITIES; i++) 924 if (f->f_pmask[i] == INTERNAL_NOPRI) 925 printf("X "); 926 else 927 printf("%d ", f->f_pmask[i]); 928 printf("%s: ", TypeNames[f->f_type]); 929 switch (f->f_type) { 930 case F_FILE: 931 case F_TTY: 932 case F_CONSOLE: 933 printf("%s", f->f_un.f_fname); 934 break; 935 936 case F_FORW: 937 printf("%s", f->f_un.f_forw.f_hname); 938 break; 939 940 case F_USERS: 941 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 942 printf("%s, ", f->f_un.f_uname[i]); 943 break; 944 } 945 printf("\n"); 946 } 947 } 948 949 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 950 dprintf("syslogd: restarted\n"); 951 } 952 953 /* 954 * Crack a configuration file line 955 */ 956 957 cfline(line, f) 958 char *line; 959 register struct filed *f; 960 { 961 register char *p; 962 register char *q; 963 register int i; 964 char *bp; 965 int pri; 966 struct hostent *hp; 967 char buf[MAXLINE], ebuf[100]; 968 969 dprintf("cfline(%s)\n", line); 970 971 errno = 0; /* keep strerror() stuff out of logerror messages */ 972 973 /* clear out file entry */ 974 bzero((char *) f, sizeof *f); 975 for (i = 0; i <= LOG_NFACILITIES; i++) 976 f->f_pmask[i] = INTERNAL_NOPRI; 977 978 /* scan through the list of selectors */ 979 for (p = line; *p && *p != '\t';) { 980 981 /* find the end of this facility name list */ 982 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 983 continue; 984 985 /* collect priority name */ 986 for (bp = buf; *q && !index("\t,;", *q); ) 987 *bp++ = *q++; 988 *bp = '\0'; 989 990 /* skip cruft */ 991 while (index(", ;", *q)) 992 q++; 993 994 /* decode priority name */ 995 if (*buf == '*') 996 pri = LOG_PRIMASK + 1; 997 else { 998 pri = decode(buf, prioritynames); 999 if (pri < 0) { 1000 (void) sprintf(ebuf, 1001 "unknown priority name \"%s\"", buf); 1002 logerror(ebuf); 1003 return; 1004 } 1005 } 1006 1007 /* scan facilities */ 1008 while (*p && !index("\t.;", *p)) { 1009 for (bp = buf; *p && !index("\t,;.", *p); ) 1010 *bp++ = *p++; 1011 *bp = '\0'; 1012 if (*buf == '*') 1013 for (i = 0; i < LOG_NFACILITIES; i++) 1014 f->f_pmask[i] = pri; 1015 else { 1016 i = decode(buf, facilitynames); 1017 if (i < 0) { 1018 (void) sprintf(ebuf, 1019 "unknown facility name \"%s\"", 1020 buf); 1021 logerror(ebuf); 1022 return; 1023 } 1024 f->f_pmask[i >> 3] = pri; 1025 } 1026 while (*p == ',' || *p == ' ') 1027 p++; 1028 } 1029 1030 p = q; 1031 } 1032 1033 /* skip to action part */ 1034 while (*p == '\t') 1035 p++; 1036 1037 switch (*p) 1038 { 1039 case '@': 1040 if (!InetInuse) 1041 break; 1042 (void) strcpy(f->f_un.f_forw.f_hname, ++p); 1043 hp = gethostbyname(p); 1044 if (hp == NULL) { 1045 extern int h_errno, h_nerr; 1046 extern char **h_errlist; 1047 1048 logerror((u_int)h_errno < h_nerr ? 1049 h_errlist[h_errno] : "Unknown error"); 1050 break; 1051 } 1052 bzero((char *) &f->f_un.f_forw.f_addr, 1053 sizeof f->f_un.f_forw.f_addr); 1054 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1055 f->f_un.f_forw.f_addr.sin_port = LogPort; 1056 bcopy(hp->h_addr, (char *) &f->f_un.f_forw.f_addr.sin_addr, hp->h_length); 1057 f->f_type = F_FORW; 1058 break; 1059 1060 case '/': 1061 (void) strcpy(f->f_un.f_fname, p); 1062 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1063 f->f_file = F_UNUSED; 1064 logerror(p); 1065 break; 1066 } 1067 if (isatty(f->f_file)) 1068 f->f_type = F_TTY; 1069 else 1070 f->f_type = F_FILE; 1071 if (strcmp(p, ctty) == 0) 1072 f->f_type = F_CONSOLE; 1073 break; 1074 1075 case '*': 1076 f->f_type = F_WALL; 1077 break; 1078 1079 default: 1080 for (i = 0; i < MAXUNAMES && *p; i++) { 1081 for (q = p; *q && *q != ','; ) 1082 q++; 1083 (void) strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1084 if ((q - p) > UT_NAMESIZE) 1085 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1086 else 1087 f->f_un.f_uname[i][q - p] = '\0'; 1088 while (*q == ',' || *q == ' ') 1089 q++; 1090 p = q; 1091 } 1092 f->f_type = F_USERS; 1093 break; 1094 } 1095 } 1096 1097 1098 /* 1099 * Decode a symbolic name to a numeric value 1100 */ 1101 1102 decode(name, codetab) 1103 char *name; 1104 CODE *codetab; 1105 { 1106 register CODE *c; 1107 register char *p; 1108 char buf[40]; 1109 1110 if (isdigit(*name)) 1111 return (atoi(name)); 1112 1113 (void) strcpy(buf, name); 1114 for (p = buf; *p; p++) 1115 if (isupper(*p)) 1116 *p = tolower(*p); 1117 for (c = codetab; c->c_name; c++) 1118 if (!strcmp(buf, c->c_name)) 1119 return (c->c_val); 1120 1121 return (-1); 1122 } 1123