1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. 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 static char copyright[] = 36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94";*/ 42 static char rcsid[] = "$NetBSD: syslogd.c,v 1.5 1996/01/02 17:48:41 perry 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 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 73 74 #include <sys/param.h> 75 #include <sys/ioctl.h> 76 #include <sys/stat.h> 77 #include <sys/wait.h> 78 #include <sys/socket.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 85 #include <netinet/in.h> 86 #include <netdb.h> 87 #include <arpa/inet.h> 88 89 #include <ctype.h> 90 #include <errno.h> 91 #include <fcntl.h> 92 #include <setjmp.h> 93 #include <signal.h> 94 #include <stdio.h> 95 #include <stdlib.h> 96 #include <string.h> 97 #include <unistd.h> 98 #include <utmp.h> 99 #include "pathnames.h" 100 101 #define SYSLOG_NAMES 102 #include <sys/syslog.h> 103 104 char *LogName = _PATH_LOG; 105 char *ConfFile = _PATH_LOGCONF; 106 char *PidFile = _PATH_LOGPID; 107 char ctty[] = _PATH_CONSOLE; 108 109 #define FDMASK(fd) (1 << (fd)) 110 111 #define dprintf if (Debug) printf 112 113 #define MAXUNAMES 20 /* maximum number of user names */ 114 115 /* 116 * Flags to logmsg(). 117 */ 118 119 #define IGN_CONS 0x001 /* don't print on console */ 120 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 121 #define ADDDATE 0x004 /* add a date to the message */ 122 #define MARK 0x008 /* this message is a mark */ 123 124 /* 125 * This structure represents the files that will have log 126 * copies printed. 127 */ 128 129 struct filed { 130 struct filed *f_next; /* next in linked list */ 131 short f_type; /* entry type, see below */ 132 short f_file; /* file descriptor */ 133 time_t f_time; /* time this was last written */ 134 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 135 union { 136 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 137 struct { 138 char f_hname[MAXHOSTNAMELEN+1]; 139 struct sockaddr_in f_addr; 140 } f_forw; /* forwarding address */ 141 char f_fname[MAXPATHLEN]; 142 } f_un; 143 char f_prevline[MAXSVLINE]; /* last message logged */ 144 char f_lasttime[16]; /* time of last occurrence */ 145 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 146 int f_prevpri; /* pri of f_prevline */ 147 int f_prevlen; /* length of f_prevline */ 148 int f_prevcount; /* repetition cnt of prevline */ 149 int f_repeatcount; /* number of "repeated" msgs */ 150 }; 151 152 /* 153 * Intervals at which we flush out "message repeated" messages, 154 * in seconds after previous message is logged. After each flush, 155 * we move to the next interval until we reach the largest. 156 */ 157 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 158 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 159 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 160 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 161 (f)->f_repeatcount = MAXREPEAT; \ 162 } 163 164 /* values for f_type */ 165 #define F_UNUSED 0 /* unused entry */ 166 #define F_FILE 1 /* regular file */ 167 #define F_TTY 2 /* terminal */ 168 #define F_CONSOLE 3 /* console terminal */ 169 #define F_FORW 4 /* remote machine */ 170 #define F_USERS 5 /* list of users */ 171 #define F_WALL 6 /* everyone logged on */ 172 173 char *TypeNames[7] = { 174 "UNUSED", "FILE", "TTY", "CONSOLE", 175 "FORW", "USERS", "WALL" 176 }; 177 178 struct filed *Files; 179 struct filed consfile; 180 181 int Debug; /* debug flag */ 182 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 183 char *LocalDomain; /* our local domain name */ 184 int InetInuse = 0; /* non-zero if INET sockets are being used */ 185 int finet; /* Internet datagram socket */ 186 int LogPort; /* port number for INET connections */ 187 int Initialized = 0; /* set when we have initialized ourselves */ 188 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 189 int MarkSeq = 0; /* mark sequence number */ 190 int SecureMode = 1; /* when true, speak only unix domain socks */ 191 192 void cfline __P((char *, struct filed *)); 193 char *cvthname __P((struct sockaddr_in *)); 194 int decode __P((const char *, CODE *)); 195 void die __P((int)); 196 void domark __P((int)); 197 void fprintlog __P((struct filed *, int, char *)); 198 void init __P((int)); 199 void logerror __P((char *)); 200 void logmsg __P((int, char *, char *, int)); 201 void printline __P((char *, char *)); 202 void printsys __P((char *)); 203 void reapchild __P((int)); 204 char *ttymsg __P((struct iovec *, int, char *, int)); 205 void usage __P((void)); 206 void wallmsg __P((struct filed *, struct iovec *)); 207 208 int 209 main(argc, argv) 210 int argc; 211 char *argv[]; 212 { 213 int ch, funix, i, inetm, fklog, klogm, len; 214 struct sockaddr_un sunx, fromunix; 215 struct sockaddr_in sin, frominet; 216 FILE *fp; 217 char *p, line[MSG_BSIZE + 1]; 218 219 while ((ch = getopt(argc, argv, "duf:m:p:")) != EOF) 220 switch(ch) { 221 case 'd': /* debug */ 222 Debug++; 223 break; 224 case 'f': /* configuration file */ 225 ConfFile = optarg; 226 break; 227 case 'm': /* mark interval */ 228 MarkInterval = atoi(optarg) * 60; 229 break; 230 case 'p': /* path */ 231 LogName = optarg; 232 break; 233 case 'u': /* allow udp input port */ 234 SecureMode = 0; 235 break; 236 case '?': 237 default: 238 usage(); 239 } 240 if ((argc -= optind) != 0) 241 usage(); 242 243 if (!Debug) 244 (void)daemon(0, 0); 245 else 246 setlinebuf(stdout); 247 248 consfile.f_type = F_CONSOLE; 249 (void)strcpy(consfile.f_un.f_fname, ctty); 250 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 251 if ((p = strchr(LocalHostName, '.')) != NULL) { 252 *p++ = '\0'; 253 LocalDomain = p; 254 } else 255 LocalDomain = ""; 256 (void)signal(SIGTERM, die); 257 (void)signal(SIGINT, Debug ? die : SIG_IGN); 258 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 259 (void)signal(SIGCHLD, reapchild); 260 (void)signal(SIGALRM, domark); 261 (void)alarm(TIMERINTVL); 262 (void)unlink(LogName); 263 264 #ifndef SUN_LEN 265 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 266 #endif 267 memset(&sunx, 0, sizeof(sunx)); 268 sunx.sun_family = AF_UNIX; 269 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 270 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 271 if (funix < 0 || 272 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 273 chmod(LogName, 0666) < 0) { 274 (void) snprintf(line, sizeof line, "cannot create %s", LogName); 275 logerror(line); 276 dprintf("cannot create %s (%d)\n", LogName, errno); 277 die(0); 278 } 279 finet = socket(AF_INET, SOCK_DGRAM, 0); 280 if (finet >= 0) { 281 struct servent *sp; 282 283 sp = getservbyname("syslog", "udp"); 284 if (sp == NULL) { 285 errno = 0; 286 logerror("syslog/udp: unknown service"); 287 die(0); 288 } 289 memset(&sin, 0, sizeof(sin)); 290 sin.sin_family = AF_INET; 291 sin.sin_port = LogPort = sp->s_port; 292 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 293 logerror("bind"); 294 if (!Debug) 295 die(0); 296 } else { 297 inetm = FDMASK(finet); 298 InetInuse = 1; 299 } 300 } 301 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 302 klogm = FDMASK(fklog); 303 else { 304 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 305 klogm = 0; 306 } 307 308 /* tuck my process id away */ 309 fp = fopen(PidFile, "w"); 310 if (fp != NULL) { 311 fprintf(fp, "%d\n", getpid()); 312 (void) fclose(fp); 313 } 314 315 dprintf("off & running....\n"); 316 317 init(0); 318 (void)signal(SIGHUP, init); 319 320 for (;;) { 321 int nfds, readfds = FDMASK(funix) | inetm | klogm; 322 323 dprintf("readfds = %#x\n", readfds); 324 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 325 (fd_set *)NULL, (struct timeval *)NULL); 326 if (nfds == 0) 327 continue; 328 if (nfds < 0) { 329 if (errno != EINTR) 330 logerror("select"); 331 continue; 332 } 333 dprintf("got a message (%d, %#x)\n", nfds, readfds); 334 if (readfds & klogm) { 335 i = read(fklog, line, sizeof(line) - 1); 336 if (i > 0) { 337 line[i] = '\0'; 338 printsys(line); 339 } else if (i < 0 && errno != EINTR) { 340 logerror("klog"); 341 fklog = -1; 342 klogm = 0; 343 } 344 } 345 if (readfds & FDMASK(funix)) { 346 len = sizeof(fromunix); 347 i = recvfrom(funix, line, MAXLINE, 0, 348 (struct sockaddr *)&fromunix, &len); 349 if (i > 0) { 350 line[i] = '\0'; 351 printline(LocalHostName, line); 352 } else if (i < 0 && errno != EINTR) 353 logerror("recvfrom unix"); 354 } 355 if (readfds & inetm) { 356 len = sizeof(frominet); 357 i = recvfrom(finet, line, MAXLINE, 0, 358 (struct sockaddr *)&frominet, &len); 359 if (SecureMode) { 360 /* silently drop it */ 361 } else { 362 if (i > 0) { 363 line[i] = '\0'; 364 printline(cvthname(&frominet), line); 365 } else if (i < 0 && errno != EINTR) 366 logerror("recvfrom inet"); 367 } 368 } 369 } 370 } 371 372 void 373 usage() 374 { 375 376 (void)fprintf(stderr, 377 "usage: syslogd [-u] [-f conffile] [-m markinterval] [-p logpath]\n"); 378 exit(1); 379 } 380 381 /* 382 * Take a raw input line, decode the message, and print the message 383 * on the appropriate log files. 384 */ 385 void 386 printline(hname, msg) 387 char *hname; 388 char *msg; 389 { 390 int c, pri; 391 char *p, *q, line[MAXLINE + 1]; 392 393 /* test for special codes */ 394 pri = DEFUPRI; 395 p = msg; 396 if (*p == '<') { 397 pri = 0; 398 while (isdigit(*++p)) 399 pri = 10 * pri + (*p - '0'); 400 if (*p == '>') 401 ++p; 402 } 403 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 404 pri = DEFUPRI; 405 406 /* don't allow users to log kernel messages */ 407 if (LOG_FAC(pri) == LOG_KERN) 408 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 409 410 q = line; 411 412 while ((c = *p++ & 0177) != '\0' && 413 q < &line[sizeof(line) - 1]) 414 if (iscntrl(c)) 415 if (c == '\n') 416 *q++ = ' '; 417 else if (c == '\t') 418 *q++ = '\t'; 419 else { 420 *q++ = '^'; 421 *q++ = c ^ 0100; 422 } 423 else 424 *q++ = c; 425 *q = '\0'; 426 427 logmsg(pri, line, hname, 0); 428 } 429 430 /* 431 * Take a raw input line from /dev/klog, split and format similar to syslog(). 432 */ 433 void 434 printsys(msg) 435 char *msg; 436 { 437 int c, pri, flags; 438 char *lp, *p, *q, line[MAXLINE + 1]; 439 440 (void)strcpy(line, _PATH_UNIX); 441 (void)strcat(line, ": "); 442 lp = line + strlen(line); 443 for (p = msg; *p != '\0'; ) { 444 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 445 pri = DEFSPRI; 446 if (*p == '<') { 447 pri = 0; 448 while (isdigit(*++p)) 449 pri = 10 * pri + (*p - '0'); 450 if (*p == '>') 451 ++p; 452 } else { 453 /* kernel printf's come out on console */ 454 flags |= IGN_CONS; 455 } 456 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 457 pri = DEFSPRI; 458 q = lp; 459 while (*p != '\0' && (c = *p++) != '\n' && 460 q < &line[MAXLINE]) 461 *q++ = c; 462 *q = '\0'; 463 logmsg(pri, line, LocalHostName, flags); 464 } 465 } 466 467 time_t now; 468 469 /* 470 * Log a message to the appropriate log files, users, etc. based on 471 * the priority. 472 */ 473 void 474 logmsg(pri, msg, from, flags) 475 int pri; 476 char *msg, *from; 477 int flags; 478 { 479 struct filed *f; 480 int fac, msglen, omask, prilev; 481 char *timestamp; 482 483 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 484 pri, flags, from, msg); 485 486 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 487 488 /* 489 * Check to see if msg looks non-standard. 490 */ 491 msglen = strlen(msg); 492 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 493 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 494 flags |= ADDDATE; 495 496 (void)time(&now); 497 if (flags & ADDDATE) 498 timestamp = ctime(&now) + 4; 499 else { 500 timestamp = msg; 501 msg += 16; 502 msglen -= 16; 503 } 504 505 /* extract facility and priority level */ 506 if (flags & MARK) 507 fac = LOG_NFACILITIES; 508 else 509 fac = LOG_FAC(pri); 510 prilev = LOG_PRI(pri); 511 512 /* log the message to the particular outputs */ 513 if (!Initialized) { 514 f = &consfile; 515 f->f_file = open(ctty, O_WRONLY, 0); 516 517 if (f->f_file >= 0) { 518 fprintlog(f, flags, msg); 519 (void)close(f->f_file); 520 } 521 (void)sigsetmask(omask); 522 return; 523 } 524 for (f = Files; f; f = f->f_next) { 525 /* skip messages that are incorrect priority */ 526 if (f->f_pmask[fac] < prilev || 527 f->f_pmask[fac] == INTERNAL_NOPRI) 528 continue; 529 530 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 531 continue; 532 533 /* don't output marks to recently written files */ 534 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 535 continue; 536 537 /* 538 * suppress duplicate lines to this file 539 */ 540 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 541 !strcmp(msg, f->f_prevline) && 542 !strcmp(from, f->f_prevhost)) { 543 (void)strncpy(f->f_lasttime, timestamp, 15); 544 f->f_prevcount++; 545 dprintf("msg repeated %d times, %ld sec of %d\n", 546 f->f_prevcount, now - f->f_time, 547 repeatinterval[f->f_repeatcount]); 548 /* 549 * If domark would have logged this by now, 550 * flush it now (so we don't hold isolated messages), 551 * but back off so we'll flush less often 552 * in the future. 553 */ 554 if (now > REPEATTIME(f)) { 555 fprintlog(f, flags, (char *)NULL); 556 BACKOFF(f); 557 } 558 } else { 559 /* new line, save it */ 560 if (f->f_prevcount) 561 fprintlog(f, 0, (char *)NULL); 562 f->f_repeatcount = 0; 563 f->f_prevpri = pri; 564 (void)strncpy(f->f_lasttime, timestamp, 15); 565 (void)strncpy(f->f_prevhost, from, 566 sizeof(f->f_prevhost)); 567 if (msglen < MAXSVLINE) { 568 f->f_prevlen = msglen; 569 (void)strcpy(f->f_prevline, msg); 570 fprintlog(f, flags, (char *)NULL); 571 } else { 572 f->f_prevline[0] = 0; 573 f->f_prevlen = 0; 574 fprintlog(f, flags, msg); 575 } 576 } 577 } 578 (void)sigsetmask(omask); 579 } 580 581 void 582 fprintlog(f, flags, msg) 583 struct filed *f; 584 int flags; 585 char *msg; 586 { 587 struct iovec iov[6]; 588 struct iovec *v; 589 int l; 590 char line[MAXLINE + 1], repbuf[80], greetings[500]; 591 592 v = iov; 593 if (f->f_type == F_WALL) { 594 v->iov_base = greetings; 595 v->iov_len = snprintf(greetings, sizeof(greetings), 596 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 597 f->f_prevhost, ctime(&now)); 598 v++; 599 v->iov_base = ""; 600 v->iov_len = 0; 601 v++; 602 } else { 603 v->iov_base = f->f_lasttime; 604 v->iov_len = 15; 605 v++; 606 v->iov_base = " "; 607 v->iov_len = 1; 608 v++; 609 } 610 v->iov_base = f->f_prevhost; 611 v->iov_len = strlen(v->iov_base); 612 v++; 613 v->iov_base = " "; 614 v->iov_len = 1; 615 v++; 616 617 if (msg) { 618 v->iov_base = msg; 619 v->iov_len = strlen(msg); 620 } else if (f->f_prevcount > 1) { 621 v->iov_base = repbuf; 622 v->iov_len = sprintf(repbuf, "last message repeated %d times", 623 f->f_prevcount); 624 } else { 625 v->iov_base = f->f_prevline; 626 v->iov_len = f->f_prevlen; 627 } 628 v++; 629 630 dprintf("Logging to %s", TypeNames[f->f_type]); 631 f->f_time = now; 632 633 switch (f->f_type) { 634 case F_UNUSED: 635 dprintf("\n"); 636 break; 637 638 case F_FORW: 639 dprintf(" %s\n", f->f_un.f_forw.f_hname); 640 l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s", f->f_prevpri, 641 iov[0].iov_base, iov[4].iov_base); 642 if (l > MAXLINE) 643 l = MAXLINE; 644 if (sendto(finet, line, l, 0, 645 (struct sockaddr *)&f->f_un.f_forw.f_addr, 646 sizeof(f->f_un.f_forw.f_addr)) != l) { 647 int e = errno; 648 (void)close(f->f_file); 649 f->f_type = F_UNUSED; 650 errno = e; 651 logerror("sendto"); 652 } 653 break; 654 655 case F_CONSOLE: 656 if (flags & IGN_CONS) { 657 dprintf(" (ignored)\n"); 658 break; 659 } 660 /* FALLTHROUGH */ 661 662 case F_TTY: 663 case F_FILE: 664 dprintf(" %s\n", f->f_un.f_fname); 665 if (f->f_type != F_FILE) { 666 v->iov_base = "\r\n"; 667 v->iov_len = 2; 668 } else { 669 v->iov_base = "\n"; 670 v->iov_len = 1; 671 } 672 again: 673 if (writev(f->f_file, iov, 6) < 0) { 674 int e = errno; 675 (void)close(f->f_file); 676 /* 677 * Check for errors on TTY's due to loss of tty 678 */ 679 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 680 f->f_file = open(f->f_un.f_fname, 681 O_WRONLY|O_APPEND, 0); 682 if (f->f_file < 0) { 683 f->f_type = F_UNUSED; 684 logerror(f->f_un.f_fname); 685 } else 686 goto again; 687 } else { 688 f->f_type = F_UNUSED; 689 errno = e; 690 logerror(f->f_un.f_fname); 691 } 692 } else if (flags & SYNC_FILE) 693 (void)fsync(f->f_file); 694 break; 695 696 case F_USERS: 697 case F_WALL: 698 dprintf("\n"); 699 v->iov_base = "\r\n"; 700 v->iov_len = 2; 701 wallmsg(f, iov); 702 break; 703 } 704 f->f_prevcount = 0; 705 } 706 707 /* 708 * WALLMSG -- Write a message to the world at large 709 * 710 * Write the specified message to either the entire 711 * world, or a list of approved users. 712 */ 713 void 714 wallmsg(f, iov) 715 struct filed *f; 716 struct iovec *iov; 717 { 718 static int reenter; /* avoid calling ourselves */ 719 FILE *uf; 720 struct utmp ut; 721 int i; 722 char *p; 723 char line[sizeof(ut.ut_line) + 1]; 724 725 if (reenter++) 726 return; 727 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 728 logerror(_PATH_UTMP); 729 reenter = 0; 730 return; 731 } 732 /* NOSTRICT */ 733 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 734 if (ut.ut_name[0] == '\0') 735 continue; 736 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 737 line[sizeof(ut.ut_line)] = '\0'; 738 if (f->f_type == F_WALL) { 739 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 740 errno = 0; /* already in msg */ 741 logerror(p); 742 } 743 continue; 744 } 745 /* should we send the message to this user? */ 746 for (i = 0; i < MAXUNAMES; i++) { 747 if (!f->f_un.f_uname[i][0]) 748 break; 749 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 750 UT_NAMESIZE)) { 751 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 752 != NULL) { 753 errno = 0; /* already in msg */ 754 logerror(p); 755 } 756 break; 757 } 758 } 759 } 760 (void)fclose(uf); 761 reenter = 0; 762 } 763 764 void 765 reapchild(signo) 766 int signo; 767 { 768 union wait status; 769 770 while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0) 771 ; 772 } 773 774 /* 775 * Return a printable representation of a host address. 776 */ 777 char * 778 cvthname(f) 779 struct sockaddr_in *f; 780 { 781 struct hostent *hp; 782 char *p; 783 784 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 785 786 if (f->sin_family != AF_INET) { 787 dprintf("Malformed from address\n"); 788 return ("???"); 789 } 790 hp = gethostbyaddr((char *)&f->sin_addr, 791 sizeof(struct in_addr), f->sin_family); 792 if (hp == 0) { 793 dprintf("Host name for your address (%s) unknown\n", 794 inet_ntoa(f->sin_addr)); 795 return (inet_ntoa(f->sin_addr)); 796 } 797 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 798 *p = '\0'; 799 return (hp->h_name); 800 } 801 802 void 803 domark(signo) 804 int signo; 805 { 806 struct filed *f; 807 808 now = time((time_t *)NULL); 809 MarkSeq += TIMERINTVL; 810 if (MarkSeq >= MarkInterval) { 811 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 812 MarkSeq = 0; 813 } 814 815 for (f = Files; f; f = f->f_next) { 816 if (f->f_prevcount && now >= REPEATTIME(f)) { 817 dprintf("flush %s: repeated %d times, %d sec.\n", 818 TypeNames[f->f_type], f->f_prevcount, 819 repeatinterval[f->f_repeatcount]); 820 fprintlog(f, 0, (char *)NULL); 821 BACKOFF(f); 822 } 823 } 824 (void)alarm(TIMERINTVL); 825 } 826 827 /* 828 * Print syslogd errors some place. 829 */ 830 void 831 logerror(type) 832 char *type; 833 { 834 char buf[100]; 835 836 if (errno) 837 (void)snprintf(buf, sizeof(buf), "syslogd: %s: %s", 838 type, strerror(errno)); 839 else 840 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 841 errno = 0; 842 dprintf("%s\n", buf); 843 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 844 } 845 846 void 847 die(signo) 848 int signo; 849 { 850 struct filed *f; 851 char buf[100]; 852 853 for (f = Files; f != NULL; f = f->f_next) { 854 /* flush any pending output */ 855 if (f->f_prevcount) 856 fprintlog(f, 0, (char *)NULL); 857 } 858 if (signo) { 859 dprintf("syslogd: exiting on signal %d\n", signo); 860 (void)sprintf(buf, "exiting on signal %d", signo); 861 errno = 0; 862 logerror(buf); 863 } 864 (void)unlink(LogName); 865 exit(0); 866 } 867 868 /* 869 * INIT -- Initialize syslogd from configuration table 870 */ 871 void 872 init(signo) 873 int signo; 874 { 875 int i; 876 FILE *cf; 877 struct filed *f, *next, **nextp; 878 char *p; 879 char cline[LINE_MAX]; 880 881 dprintf("init\n"); 882 883 /* 884 * Close all open log files. 885 */ 886 Initialized = 0; 887 for (f = Files; f != NULL; f = next) { 888 /* flush any pending output */ 889 if (f->f_prevcount) 890 fprintlog(f, 0, (char *)NULL); 891 892 switch (f->f_type) { 893 case F_FILE: 894 case F_TTY: 895 case F_CONSOLE: 896 case F_FORW: 897 (void)close(f->f_file); 898 break; 899 } 900 next = f->f_next; 901 free((char *)f); 902 } 903 Files = NULL; 904 nextp = &Files; 905 906 /* open the configuration file */ 907 if ((cf = fopen(ConfFile, "r")) == NULL) { 908 dprintf("cannot open %s\n", ConfFile); 909 *nextp = (struct filed *)calloc(1, sizeof(*f)); 910 cfline("*.ERR\t/dev/console", *nextp); 911 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 912 cfline("*.PANIC\t*", (*nextp)->f_next); 913 Initialized = 1; 914 return; 915 } 916 917 /* 918 * Foreach line in the conf table, open that file. 919 */ 920 f = NULL; 921 while (fgets(cline, sizeof(cline), cf) != NULL) { 922 /* 923 * check for end-of-section, comments, strip off trailing 924 * spaces and newline character. 925 */ 926 for (p = cline; isspace(*p); ++p) 927 continue; 928 if (*p == NULL || *p == '#') 929 continue; 930 for (p = strchr(cline, '\0'); isspace(*--p);) 931 continue; 932 *++p = '\0'; 933 f = (struct filed *)calloc(1, sizeof(*f)); 934 *nextp = f; 935 nextp = &f->f_next; 936 cfline(cline, f); 937 } 938 939 /* close the configuration file */ 940 (void)fclose(cf); 941 942 Initialized = 1; 943 944 if (Debug) { 945 for (f = Files; f; f = f->f_next) { 946 for (i = 0; i <= LOG_NFACILITIES; i++) 947 if (f->f_pmask[i] == INTERNAL_NOPRI) 948 printf("X "); 949 else 950 printf("%d ", f->f_pmask[i]); 951 printf("%s: ", TypeNames[f->f_type]); 952 switch (f->f_type) { 953 case F_FILE: 954 case F_TTY: 955 case F_CONSOLE: 956 printf("%s", f->f_un.f_fname); 957 break; 958 959 case F_FORW: 960 printf("%s", f->f_un.f_forw.f_hname); 961 break; 962 963 case F_USERS: 964 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 965 printf("%s, ", f->f_un.f_uname[i]); 966 break; 967 } 968 printf("\n"); 969 } 970 } 971 972 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 973 dprintf("syslogd: restarted\n"); 974 } 975 976 /* 977 * Crack a configuration file line 978 */ 979 void 980 cfline(line, f) 981 char *line; 982 struct filed *f; 983 { 984 struct hostent *hp; 985 int i, pri; 986 char *bp, *p, *q; 987 char buf[MAXLINE], ebuf[100]; 988 989 dprintf("cfline(%s)\n", line); 990 991 errno = 0; /* keep strerror() stuff out of logerror messages */ 992 993 /* clear out file entry */ 994 memset(f, 0, sizeof(*f)); 995 for (i = 0; i <= LOG_NFACILITIES; i++) 996 f->f_pmask[i] = INTERNAL_NOPRI; 997 998 /* scan through the list of selectors */ 999 for (p = line; *p && *p != '\t';) { 1000 1001 /* find the end of this facility name list */ 1002 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1003 continue; 1004 1005 /* collect priority name */ 1006 for (bp = buf; *q && !strchr("\t,;", *q); ) 1007 *bp++ = *q++; 1008 *bp = '\0'; 1009 1010 /* skip cruft */ 1011 while (strchr(", ;", *q)) 1012 q++; 1013 1014 /* decode priority name */ 1015 if (*buf == '*') 1016 pri = LOG_PRIMASK + 1; 1017 else { 1018 pri = decode(buf, prioritynames); 1019 if (pri < 0) { 1020 (void)snprintf(ebuf, sizeof ebuf, 1021 "unknown priority name \"%s\"", buf); 1022 logerror(ebuf); 1023 return; 1024 } 1025 } 1026 1027 /* scan facilities */ 1028 while (*p && !strchr("\t.;", *p)) { 1029 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1030 *bp++ = *p++; 1031 *bp = '\0'; 1032 if (*buf == '*') 1033 for (i = 0; i < LOG_NFACILITIES; i++) 1034 f->f_pmask[i] = pri; 1035 else { 1036 i = decode(buf, facilitynames); 1037 if (i < 0) { 1038 (void)snprintf(ebuf, sizeof(ebuf), 1039 "unknown facility name \"%s\"", 1040 buf); 1041 logerror(ebuf); 1042 return; 1043 } 1044 f->f_pmask[i >> 3] = pri; 1045 } 1046 while (*p == ',' || *p == ' ') 1047 p++; 1048 } 1049 1050 p = q; 1051 } 1052 1053 /* skip to action part */ 1054 while (*p == '\t') 1055 p++; 1056 1057 switch (*p) 1058 { 1059 case '@': 1060 if (!InetInuse) 1061 break; 1062 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1063 hp = gethostbyname(p); 1064 if (hp == NULL) { 1065 extern int h_errno; 1066 1067 logerror((char *)hstrerror(h_errno)); 1068 break; 1069 } 1070 memset(&f->f_un.f_forw.f_addr, 0, 1071 sizeof(f->f_un.f_forw.f_addr)); 1072 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1073 f->f_un.f_forw.f_addr.sin_port = LogPort; 1074 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1075 f->f_type = F_FORW; 1076 break; 1077 1078 case '/': 1079 (void)strcpy(f->f_un.f_fname, p); 1080 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1081 f->f_file = F_UNUSED; 1082 logerror(p); 1083 break; 1084 } 1085 if (isatty(f->f_file)) 1086 f->f_type = F_TTY; 1087 else 1088 f->f_type = F_FILE; 1089 if (strcmp(p, ctty) == 0) 1090 f->f_type = F_CONSOLE; 1091 break; 1092 1093 case '*': 1094 f->f_type = F_WALL; 1095 break; 1096 1097 default: 1098 for (i = 0; i < MAXUNAMES && *p; i++) { 1099 for (q = p; *q && *q != ','; ) 1100 q++; 1101 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1102 if ((q - p) > UT_NAMESIZE) 1103 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1104 else 1105 f->f_un.f_uname[i][q - p] = '\0'; 1106 while (*q == ',' || *q == ' ') 1107 q++; 1108 p = q; 1109 } 1110 f->f_type = F_USERS; 1111 break; 1112 } 1113 } 1114 1115 1116 /* 1117 * Decode a symbolic name to a numeric value 1118 */ 1119 int 1120 decode(name, codetab) 1121 const char *name; 1122 CODE *codetab; 1123 { 1124 CODE *c; 1125 char *p, buf[40]; 1126 1127 if (isdigit(*name)) 1128 return (atoi(name)); 1129 1130 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1131 if (isupper(*name)) 1132 *p = tolower(*name); 1133 else 1134 *p = *name; 1135 } 1136 *p = '\0'; 1137 for (c = codetab; c->c_name; c++) 1138 if (!strcmp(buf, c->c_name)) 1139 return (c->c_val); 1140 1141 return (-1); 1142 } 1143