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 #include <sys/cdefs.h> 35 #ifndef lint 36 __COPYRIGHT("@(#) 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 #if 0 42 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43 #else 44 __RCSID("$NetBSD: syslogd.c,v 1.11 1997/06/29 18:57:45 christos Exp $"); 45 #endif 46 #endif /* not lint */ 47 48 /* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximimum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 */ 69 70 #define MAXLINE 1024 /* maximum line length */ 71 #define MAXSVLINE 120 /* maximum saved line length */ 72 #define DEFUPRI (LOG_USER|LOG_NOTICE) 73 #define DEFSPRI (LOG_KERN|LOG_CRIT) 74 #define TIMERINTVL 30 /* interval for checking flush, mark */ 75 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 76 77 #include <sys/param.h> 78 #include <sys/ioctl.h> 79 #include <sys/stat.h> 80 #include <sys/wait.h> 81 #include <sys/socket.h> 82 #include <sys/msgbuf.h> 83 #include <sys/uio.h> 84 #include <sys/un.h> 85 #include <sys/time.h> 86 #include <sys/resource.h> 87 88 #include <netinet/in.h> 89 #include <netdb.h> 90 #include <arpa/inet.h> 91 92 #include <ctype.h> 93 #include <errno.h> 94 #include <fcntl.h> 95 #include <setjmp.h> 96 #include <signal.h> 97 #include <stdio.h> 98 #include <stdlib.h> 99 #include <string.h> 100 #include <unistd.h> 101 #include <utmp.h> 102 #include <util.h> 103 #include "pathnames.h" 104 105 #define SYSLOG_NAMES 106 #include <sys/syslog.h> 107 108 char *LogName = _PATH_LOG; 109 char *ConfFile = _PATH_LOGCONF; 110 char *PidFile = _PATH_LOGPID; 111 char ctty[] = _PATH_CONSOLE; 112 113 #define FDMASK(fd) (1 << (fd)) 114 115 #define dprintf if (Debug) printf 116 117 #define MAXUNAMES 20 /* maximum number of user names */ 118 119 /* 120 * Flags to logmsg(). 121 */ 122 123 #define IGN_CONS 0x001 /* don't print on console */ 124 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 125 #define ADDDATE 0x004 /* add a date to the message */ 126 #define MARK 0x008 /* this message is a mark */ 127 128 /* 129 * This structure represents the files that will have log 130 * copies printed. 131 */ 132 133 struct filed { 134 struct filed *f_next; /* next in linked list */ 135 short f_type; /* entry type, see below */ 136 short f_file; /* file descriptor */ 137 time_t f_time; /* time this was last written */ 138 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 139 union { 140 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 141 struct { 142 char f_hname[MAXHOSTNAMELEN+1]; 143 struct sockaddr_in f_addr; 144 } f_forw; /* forwarding address */ 145 char f_fname[MAXPATHLEN]; 146 } f_un; 147 char f_prevline[MAXSVLINE]; /* last message logged */ 148 char f_lasttime[16]; /* time of last occurrence */ 149 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 150 int f_prevpri; /* pri of f_prevline */ 151 int f_prevlen; /* length of f_prevline */ 152 int f_prevcount; /* repetition cnt of prevline */ 153 int f_repeatcount; /* number of "repeated" msgs */ 154 }; 155 156 /* 157 * Intervals at which we flush out "message repeated" messages, 158 * in seconds after previous message is logged. After each flush, 159 * we move to the next interval until we reach the largest. 160 */ 161 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 162 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 163 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 164 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 165 (f)->f_repeatcount = MAXREPEAT; \ 166 } 167 168 /* values for f_type */ 169 #define F_UNUSED 0 /* unused entry */ 170 #define F_FILE 1 /* regular file */ 171 #define F_TTY 2 /* terminal */ 172 #define F_CONSOLE 3 /* console terminal */ 173 #define F_FORW 4 /* remote machine */ 174 #define F_USERS 5 /* list of users */ 175 #define F_WALL 6 /* everyone logged on */ 176 177 char *TypeNames[7] = { 178 "UNUSED", "FILE", "TTY", "CONSOLE", 179 "FORW", "USERS", "WALL" 180 }; 181 182 struct filed *Files; 183 struct filed consfile; 184 185 int Debug; /* debug flag */ 186 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 187 char *LocalDomain; /* our local domain name */ 188 int InetInuse = 0; /* non-zero if INET sockets are being used */ 189 int finet; /* Internet datagram socket */ 190 int LogPort; /* port number for INET connections */ 191 int Initialized = 0; /* set when we have initialized ourselves */ 192 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 193 int MarkSeq = 0; /* mark sequence number */ 194 int SecureMode = 0; /* when true, speak only unix domain socks */ 195 196 void cfline __P((char *, struct filed *)); 197 char *cvthname __P((struct sockaddr_in *)); 198 int decode __P((const char *, CODE *)); 199 void die __P((int)); 200 void domark __P((int)); 201 void fprintlog __P((struct filed *, int, char *)); 202 void init __P((int)); 203 void logerror __P((char *)); 204 void logmsg __P((int, char *, char *, int)); 205 void printline __P((char *, char *)); 206 void printsys __P((char *)); 207 void reapchild __P((int)); 208 void usage __P((void)); 209 void wallmsg __P((struct filed *, struct iovec *)); 210 int main __P((int, char *[])); 211 212 int 213 main(argc, argv) 214 int argc; 215 char *argv[]; 216 { 217 int ch, funix, i, inetm, fklog, klogm, len; 218 struct sockaddr_un sunx, fromunix; 219 struct sockaddr_in sin, frominet; 220 FILE *fp; 221 char *p, line[MSG_BSIZE + 1]; 222 223 while ((ch = getopt(argc, argv, "dsf:m:p:")) != EOF) 224 switch(ch) { 225 case 'd': /* debug */ 226 Debug++; 227 break; 228 case 'f': /* configuration file */ 229 ConfFile = optarg; 230 break; 231 case 'm': /* mark interval */ 232 MarkInterval = atoi(optarg) * 60; 233 break; 234 case 'p': /* path */ 235 LogName = optarg; 236 break; 237 case 's': /* no network mode */ 238 SecureMode++; 239 break; 240 case '?': 241 default: 242 usage(); 243 } 244 if ((argc -= optind) != 0) 245 usage(); 246 247 if (!Debug) 248 (void)daemon(0, 0); 249 else 250 setlinebuf(stdout); 251 252 consfile.f_type = F_CONSOLE; 253 (void)strcpy(consfile.f_un.f_fname, ctty); 254 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 255 if ((p = strchr(LocalHostName, '.')) != NULL) { 256 *p++ = '\0'; 257 LocalDomain = p; 258 } else 259 LocalDomain = ""; 260 (void)signal(SIGTERM, die); 261 (void)signal(SIGINT, Debug ? die : SIG_IGN); 262 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 263 (void)signal(SIGCHLD, reapchild); 264 (void)signal(SIGALRM, domark); 265 (void)alarm(TIMERINTVL); 266 (void)unlink(LogName); 267 268 #ifndef SUN_LEN 269 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 270 #endif 271 memset(&sunx, 0, sizeof(sunx)); 272 sunx.sun_family = AF_UNIX; 273 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 274 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 275 if (funix < 0 || 276 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 277 chmod(LogName, 0666) < 0) { 278 (void) sprintf(line, "cannot create %s", LogName); 279 logerror(line); 280 dprintf("cannot create %s (%d)\n", LogName, errno); 281 die(0); 282 } 283 284 if (!SecureMode) 285 finet = socket(AF_INET, SOCK_DGRAM, 0); 286 else 287 finet = -1; 288 289 inetm = 0; 290 if (finet >= 0) { 291 struct servent *sp; 292 293 sp = getservbyname("syslog", "udp"); 294 if (sp == NULL) { 295 errno = 0; 296 logerror("syslog/udp: unknown service"); 297 die(0); 298 } 299 memset(&sin, 0, sizeof(sin)); 300 sin.sin_family = AF_INET; 301 sin.sin_port = LogPort = sp->s_port; 302 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 303 logerror("bind"); 304 if (!Debug) 305 die(0); 306 } else { 307 inetm = FDMASK(finet); 308 InetInuse = 1; 309 } 310 } 311 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 312 klogm = FDMASK(fklog); 313 else { 314 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 315 klogm = 0; 316 } 317 318 /* tuck my process id away, if i'm not in debug mode */ 319 if (Debug == 0) { 320 fp = fopen(PidFile, "w"); 321 if (fp != NULL) { 322 fprintf(fp, "%d\n", getpid()); 323 (void) fclose(fp); 324 } 325 } 326 327 dprintf("off & running....\n"); 328 329 init(0); 330 (void)signal(SIGHUP, init); 331 332 for (;;) { 333 int nfds, readfds = FDMASK(funix) | inetm | klogm; 334 335 dprintf("readfds = %#x\n", readfds); 336 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 337 (fd_set *)NULL, (struct timeval *)NULL); 338 if (nfds == 0) 339 continue; 340 if (nfds < 0) { 341 if (errno != EINTR) 342 logerror("select"); 343 continue; 344 } 345 dprintf("got a message (%d, %#x)\n", nfds, readfds); 346 if (readfds & klogm) { 347 i = read(fklog, line, sizeof(line) - 1); 348 if (i > 0) { 349 line[i] = '\0'; 350 printsys(line); 351 } else if (i < 0 && errno != EINTR) { 352 logerror("klog"); 353 fklog = -1; 354 klogm = 0; 355 } 356 } 357 if (readfds & FDMASK(funix)) { 358 len = sizeof(fromunix); 359 i = recvfrom(funix, line, MAXLINE, 0, 360 (struct sockaddr *)&fromunix, &len); 361 if (i > 0) { 362 line[i] = '\0'; 363 printline(LocalHostName, line); 364 } else if (i < 0 && errno != EINTR) 365 logerror("recvfrom unix"); 366 } 367 if (readfds & inetm) { 368 len = sizeof(frominet); 369 i = recvfrom(finet, line, MAXLINE, 0, 370 (struct sockaddr *)&frominet, &len); 371 if (i > 0) { 372 line[i] = '\0'; 373 printline(cvthname(&frominet), line); 374 } else if (i < 0 && errno != EINTR) 375 logerror("recvfrom inet"); 376 } 377 } 378 } 379 380 void 381 usage() 382 { 383 384 (void)fprintf(stderr, 385 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); 386 exit(1); 387 } 388 389 /* 390 * Take a raw input line, decode the message, and print the message 391 * on the appropriate log files. 392 */ 393 void 394 printline(hname, msg) 395 char *hname; 396 char *msg; 397 { 398 int c, pri; 399 char *p, *q, line[MAXLINE + 1]; 400 401 /* test for special codes */ 402 pri = DEFUPRI; 403 p = msg; 404 if (*p == '<') { 405 pri = 0; 406 while (isdigit(*++p)) 407 pri = 10 * pri + (*p - '0'); 408 if (*p == '>') 409 ++p; 410 } 411 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 412 pri = DEFUPRI; 413 414 /* don't allow users to log kernel messages */ 415 if (LOG_FAC(pri) == LOG_KERN) 416 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 417 418 q = line; 419 420 while ((c = *p++ & 0177) != '\0' && 421 q < &line[sizeof(line) - 1]) 422 if (iscntrl(c)) 423 if (c == '\n') 424 *q++ = ' '; 425 else if (c == '\t') 426 *q++ = '\t'; 427 else { 428 *q++ = '^'; 429 *q++ = c ^ 0100; 430 } 431 else 432 *q++ = c; 433 *q = '\0'; 434 435 logmsg(pri, line, hname, 0); 436 } 437 438 /* 439 * Take a raw input line from /dev/klog, split and format similar to syslog(). 440 */ 441 void 442 printsys(msg) 443 char *msg; 444 { 445 int c, pri, flags; 446 char *lp, *p, *q, line[MAXLINE + 1]; 447 448 (void)strcpy(line, _PATH_UNIX); 449 (void)strcat(line, ": "); 450 lp = line + strlen(line); 451 for (p = msg; *p != '\0'; ) { 452 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 453 pri = DEFSPRI; 454 if (*p == '<') { 455 pri = 0; 456 while (isdigit(*++p)) 457 pri = 10 * pri + (*p - '0'); 458 if (*p == '>') 459 ++p; 460 } else { 461 /* kernel printf's come out on console */ 462 flags |= IGN_CONS; 463 } 464 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 465 pri = DEFSPRI; 466 q = lp; 467 while (*p != '\0' && (c = *p++) != '\n' && 468 q < &line[MAXLINE]) 469 *q++ = c; 470 *q = '\0'; 471 logmsg(pri, line, LocalHostName, flags); 472 } 473 } 474 475 time_t now; 476 477 /* 478 * Log a message to the appropriate log files, users, etc. based on 479 * the priority. 480 */ 481 void 482 logmsg(pri, msg, from, flags) 483 int pri; 484 char *msg, *from; 485 int flags; 486 { 487 struct filed *f; 488 int fac, msglen, omask, prilev; 489 char *timestamp; 490 491 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 492 pri, flags, from, msg); 493 494 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 495 496 /* 497 * Check to see if msg looks non-standard. 498 */ 499 msglen = strlen(msg); 500 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 501 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 502 flags |= ADDDATE; 503 504 (void)time(&now); 505 if (flags & ADDDATE) 506 timestamp = ctime(&now) + 4; 507 else { 508 timestamp = msg; 509 msg += 16; 510 msglen -= 16; 511 } 512 513 /* extract facility and priority level */ 514 if (flags & MARK) 515 fac = LOG_NFACILITIES; 516 else 517 fac = LOG_FAC(pri); 518 prilev = LOG_PRI(pri); 519 520 /* log the message to the particular outputs */ 521 if (!Initialized) { 522 f = &consfile; 523 f->f_file = open(ctty, O_WRONLY, 0); 524 525 if (f->f_file >= 0) { 526 fprintlog(f, flags, msg); 527 (void)close(f->f_file); 528 } 529 (void)sigsetmask(omask); 530 return; 531 } 532 for (f = Files; f; f = f->f_next) { 533 /* skip messages that are incorrect priority */ 534 if (f->f_pmask[fac] < prilev || 535 f->f_pmask[fac] == INTERNAL_NOPRI) 536 continue; 537 538 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 539 continue; 540 541 /* don't output marks to recently written files */ 542 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 543 continue; 544 545 /* 546 * suppress duplicate lines to this file 547 */ 548 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 549 !strcmp(msg, f->f_prevline) && 550 !strcmp(from, f->f_prevhost)) { 551 (void)strncpy(f->f_lasttime, timestamp, 15); 552 f->f_prevcount++; 553 dprintf("msg repeated %d times, %ld sec of %d\n", 554 f->f_prevcount, now - f->f_time, 555 repeatinterval[f->f_repeatcount]); 556 /* 557 * If domark would have logged this by now, 558 * flush it now (so we don't hold isolated messages), 559 * but back off so we'll flush less often 560 * in the future. 561 */ 562 if (now > REPEATTIME(f)) { 563 fprintlog(f, flags, (char *)NULL); 564 BACKOFF(f); 565 } 566 } else { 567 /* new line, save it */ 568 if (f->f_prevcount) 569 fprintlog(f, 0, (char *)NULL); 570 f->f_repeatcount = 0; 571 f->f_prevpri = pri; 572 (void)strncpy(f->f_lasttime, timestamp, 15); 573 (void)strncpy(f->f_prevhost, from, 574 sizeof(f->f_prevhost)); 575 if (msglen < MAXSVLINE) { 576 f->f_prevlen = msglen; 577 (void)strcpy(f->f_prevline, msg); 578 fprintlog(f, flags, (char *)NULL); 579 } else { 580 f->f_prevline[0] = 0; 581 f->f_prevlen = 0; 582 fprintlog(f, flags, msg); 583 } 584 } 585 } 586 (void)sigsetmask(omask); 587 } 588 589 void 590 fprintlog(f, flags, msg) 591 struct filed *f; 592 int flags; 593 char *msg; 594 { 595 struct iovec iov[6]; 596 struct iovec *v; 597 int l; 598 char line[MAXLINE + 1], repbuf[80], greetings[200]; 599 600 v = iov; 601 if (f->f_type == F_WALL) { 602 v->iov_base = greetings; 603 v->iov_len = sprintf(greetings, 604 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 605 f->f_prevhost, ctime(&now)); 606 v++; 607 v->iov_base = ""; 608 v->iov_len = 0; 609 v++; 610 } else { 611 v->iov_base = f->f_lasttime; 612 v->iov_len = 15; 613 v++; 614 v->iov_base = " "; 615 v->iov_len = 1; 616 v++; 617 } 618 v->iov_base = f->f_prevhost; 619 v->iov_len = strlen(v->iov_base); 620 v++; 621 v->iov_base = " "; 622 v->iov_len = 1; 623 v++; 624 625 if (msg) { 626 v->iov_base = msg; 627 v->iov_len = strlen(msg); 628 } else if (f->f_prevcount > 1) { 629 v->iov_base = repbuf; 630 v->iov_len = sprintf(repbuf, "last message repeated %d times", 631 f->f_prevcount); 632 } else { 633 v->iov_base = f->f_prevline; 634 v->iov_len = f->f_prevlen; 635 } 636 v++; 637 638 dprintf("Logging to %s", TypeNames[f->f_type]); 639 f->f_time = now; 640 641 switch (f->f_type) { 642 case F_UNUSED: 643 dprintf("\n"); 644 break; 645 646 case F_FORW: 647 dprintf(" %s\n", f->f_un.f_forw.f_hname); 648 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 649 iov[0].iov_base, iov[4].iov_base); 650 if (l > MAXLINE) 651 l = MAXLINE; 652 if ((finet >= 0) && 653 (sendto(finet, line, l, 0, 654 (struct sockaddr *)&f->f_un.f_forw.f_addr, 655 sizeof(f->f_un.f_forw.f_addr)) != l)) { 656 int e = errno; 657 (void)close(f->f_file); 658 f->f_type = F_UNUSED; 659 errno = e; 660 logerror("sendto"); 661 } 662 break; 663 664 case F_CONSOLE: 665 if (flags & IGN_CONS) { 666 dprintf(" (ignored)\n"); 667 break; 668 } 669 /* FALLTHROUGH */ 670 671 case F_TTY: 672 case F_FILE: 673 dprintf(" %s\n", f->f_un.f_fname); 674 if (f->f_type != F_FILE) { 675 v->iov_base = "\r\n"; 676 v->iov_len = 2; 677 } else { 678 v->iov_base = "\n"; 679 v->iov_len = 1; 680 } 681 again: 682 if (writev(f->f_file, iov, 6) < 0) { 683 int e = errno; 684 (void)close(f->f_file); 685 /* 686 * Check for errors on TTY's due to loss of tty 687 */ 688 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 689 f->f_file = open(f->f_un.f_fname, 690 O_WRONLY|O_APPEND, 0); 691 if (f->f_file < 0) { 692 f->f_type = F_UNUSED; 693 logerror(f->f_un.f_fname); 694 } else 695 goto again; 696 } else { 697 f->f_type = F_UNUSED; 698 errno = e; 699 logerror(f->f_un.f_fname); 700 } 701 } else if (flags & SYNC_FILE) 702 (void)fsync(f->f_file); 703 break; 704 705 case F_USERS: 706 case F_WALL: 707 dprintf("\n"); 708 v->iov_base = "\r\n"; 709 v->iov_len = 2; 710 wallmsg(f, iov); 711 break; 712 } 713 f->f_prevcount = 0; 714 } 715 716 /* 717 * WALLMSG -- Write a message to the world at large 718 * 719 * Write the specified message to either the entire 720 * world, or a list of approved users. 721 */ 722 void 723 wallmsg(f, iov) 724 struct filed *f; 725 struct iovec *iov; 726 { 727 static int reenter; /* avoid calling ourselves */ 728 FILE *uf; 729 struct utmp ut; 730 int i; 731 char *p; 732 char line[sizeof(ut.ut_line) + 1]; 733 734 if (reenter++) 735 return; 736 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 737 logerror(_PATH_UTMP); 738 reenter = 0; 739 return; 740 } 741 /* NOSTRICT */ 742 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 743 if (ut.ut_name[0] == '\0') 744 continue; 745 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 746 line[sizeof(ut.ut_line)] = '\0'; 747 if (f->f_type == F_WALL) { 748 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 749 errno = 0; /* already in msg */ 750 logerror(p); 751 } 752 continue; 753 } 754 /* should we send the message to this user? */ 755 for (i = 0; i < MAXUNAMES; i++) { 756 if (!f->f_un.f_uname[i][0]) 757 break; 758 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 759 UT_NAMESIZE)) { 760 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 761 != NULL) { 762 errno = 0; /* already in msg */ 763 logerror(p); 764 } 765 break; 766 } 767 } 768 } 769 (void)fclose(uf); 770 reenter = 0; 771 } 772 773 void 774 reapchild(signo) 775 int signo; 776 { 777 union wait status; 778 779 while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0) 780 ; 781 } 782 783 /* 784 * Return a printable representation of a host address. 785 */ 786 char * 787 cvthname(f) 788 struct sockaddr_in *f; 789 { 790 struct hostent *hp; 791 char *p; 792 793 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 794 795 if (f->sin_family != AF_INET) { 796 dprintf("Malformed from address\n"); 797 return ("???"); 798 } 799 hp = gethostbyaddr((char *)&f->sin_addr, 800 sizeof(struct in_addr), f->sin_family); 801 if (hp == 0) { 802 dprintf("Host name for your address (%s) unknown\n", 803 inet_ntoa(f->sin_addr)); 804 return (inet_ntoa(f->sin_addr)); 805 } 806 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 807 *p = '\0'; 808 return (hp->h_name); 809 } 810 811 void 812 domark(signo) 813 int signo; 814 { 815 struct filed *f; 816 817 now = time((time_t *)NULL); 818 MarkSeq += TIMERINTVL; 819 if (MarkSeq >= MarkInterval) { 820 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 821 MarkSeq = 0; 822 } 823 824 for (f = Files; f; f = f->f_next) { 825 if (f->f_prevcount && now >= REPEATTIME(f)) { 826 dprintf("flush %s: repeated %d times, %d sec.\n", 827 TypeNames[f->f_type], f->f_prevcount, 828 repeatinterval[f->f_repeatcount]); 829 fprintlog(f, 0, (char *)NULL); 830 BACKOFF(f); 831 } 832 } 833 (void)alarm(TIMERINTVL); 834 } 835 836 /* 837 * Print syslogd errors some place. 838 */ 839 void 840 logerror(type) 841 char *type; 842 { 843 char buf[100]; 844 845 if (errno) 846 (void)snprintf(buf, 847 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 848 else 849 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 850 errno = 0; 851 dprintf("%s\n", buf); 852 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 853 } 854 855 void 856 die(signo) 857 int signo; 858 { 859 struct filed *f; 860 char buf[100]; 861 862 for (f = Files; f != NULL; f = f->f_next) { 863 /* flush any pending output */ 864 if (f->f_prevcount) 865 fprintlog(f, 0, (char *)NULL); 866 } 867 if (signo) { 868 dprintf("syslogd: exiting on signal %d\n", signo); 869 (void)sprintf(buf, "exiting on signal %d", signo); 870 errno = 0; 871 logerror(buf); 872 } 873 (void)unlink(LogName); 874 exit(0); 875 } 876 877 /* 878 * INIT -- Initialize syslogd from configuration table 879 */ 880 void 881 init(signo) 882 int signo; 883 { 884 int i; 885 FILE *cf; 886 struct filed *f, *next, **nextp; 887 char *p; 888 char cline[LINE_MAX]; 889 890 dprintf("init\n"); 891 892 /* 893 * Close all open log files. 894 */ 895 Initialized = 0; 896 for (f = Files; f != NULL; f = next) { 897 /* flush any pending output */ 898 if (f->f_prevcount) 899 fprintlog(f, 0, (char *)NULL); 900 901 switch (f->f_type) { 902 case F_FILE: 903 case F_TTY: 904 case F_CONSOLE: 905 case F_FORW: 906 (void)close(f->f_file); 907 break; 908 } 909 next = f->f_next; 910 free((char *)f); 911 } 912 Files = NULL; 913 nextp = &Files; 914 915 /* open the configuration file */ 916 if ((cf = fopen(ConfFile, "r")) == NULL) { 917 dprintf("cannot open %s\n", ConfFile); 918 *nextp = (struct filed *)calloc(1, sizeof(*f)); 919 cfline("*.ERR\t/dev/console", *nextp); 920 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 921 cfline("*.PANIC\t*", (*nextp)->f_next); 922 Initialized = 1; 923 return; 924 } 925 926 /* 927 * Foreach line in the conf table, open that file. 928 */ 929 f = NULL; 930 while (fgets(cline, sizeof(cline), cf) != NULL) { 931 /* 932 * check for end-of-section, comments, strip off trailing 933 * spaces and newline character. 934 */ 935 for (p = cline; isspace(*p); ++p) 936 continue; 937 if (*p == '\0' || *p == '#') 938 continue; 939 for (p = strchr(cline, '\0'); isspace(*--p);) 940 continue; 941 *++p = '\0'; 942 f = (struct filed *)calloc(1, sizeof(*f)); 943 *nextp = f; 944 nextp = &f->f_next; 945 cfline(cline, f); 946 } 947 948 /* close the configuration file */ 949 (void)fclose(cf); 950 951 Initialized = 1; 952 953 if (Debug) { 954 for (f = Files; f; f = f->f_next) { 955 for (i = 0; i <= LOG_NFACILITIES; i++) 956 if (f->f_pmask[i] == INTERNAL_NOPRI) 957 printf("X "); 958 else 959 printf("%d ", f->f_pmask[i]); 960 printf("%s: ", TypeNames[f->f_type]); 961 switch (f->f_type) { 962 case F_FILE: 963 case F_TTY: 964 case F_CONSOLE: 965 printf("%s", f->f_un.f_fname); 966 break; 967 968 case F_FORW: 969 printf("%s", f->f_un.f_forw.f_hname); 970 break; 971 972 case F_USERS: 973 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 974 printf("%s, ", f->f_un.f_uname[i]); 975 break; 976 } 977 printf("\n"); 978 } 979 } 980 981 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 982 dprintf("syslogd: restarted\n"); 983 } 984 985 /* 986 * Crack a configuration file line 987 */ 988 void 989 cfline(line, f) 990 char *line; 991 struct filed *f; 992 { 993 struct hostent *hp; 994 int i, pri; 995 char *bp, *p, *q; 996 char buf[MAXLINE], ebuf[100]; 997 998 dprintf("cfline(%s)\n", line); 999 1000 errno = 0; /* keep strerror() stuff out of logerror messages */ 1001 1002 /* clear out file entry */ 1003 memset(f, 0, sizeof(*f)); 1004 for (i = 0; i <= LOG_NFACILITIES; i++) 1005 f->f_pmask[i] = INTERNAL_NOPRI; 1006 1007 /* scan through the list of selectors */ 1008 for (p = line; *p && *p != '\t';) { 1009 1010 /* find the end of this facility name list */ 1011 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1012 continue; 1013 1014 /* collect priority name */ 1015 for (bp = buf; *q && !strchr("\t,;", *q); ) 1016 *bp++ = *q++; 1017 *bp = '\0'; 1018 1019 /* skip cruft */ 1020 while (strchr(", ;", *q)) 1021 q++; 1022 1023 /* decode priority name */ 1024 if (*buf == '*') 1025 pri = LOG_PRIMASK + 1; 1026 else { 1027 pri = decode(buf, prioritynames); 1028 if (pri < 0) { 1029 (void)sprintf(ebuf, 1030 "unknown priority name \"%s\"", buf); 1031 logerror(ebuf); 1032 return; 1033 } 1034 } 1035 1036 /* scan facilities */ 1037 while (*p && !strchr("\t.;", *p)) { 1038 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1039 *bp++ = *p++; 1040 *bp = '\0'; 1041 if (*buf == '*') 1042 for (i = 0; i < LOG_NFACILITIES; i++) 1043 f->f_pmask[i] = pri; 1044 else { 1045 i = decode(buf, facilitynames); 1046 if (i < 0) { 1047 (void)sprintf(ebuf, 1048 "unknown facility name \"%s\"", 1049 buf); 1050 logerror(ebuf); 1051 return; 1052 } 1053 f->f_pmask[i >> 3] = pri; 1054 } 1055 while (*p == ',' || *p == ' ') 1056 p++; 1057 } 1058 1059 p = q; 1060 } 1061 1062 /* skip to action part */ 1063 while (*p == '\t') 1064 p++; 1065 1066 switch (*p) 1067 { 1068 case '@': 1069 if (!InetInuse) 1070 break; 1071 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1072 hp = gethostbyname(p); 1073 if (hp == NULL) { 1074 extern int h_errno; 1075 1076 logerror((char *)hstrerror(h_errno)); 1077 break; 1078 } 1079 memset(&f->f_un.f_forw.f_addr, 0, 1080 sizeof(f->f_un.f_forw.f_addr)); 1081 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1082 f->f_un.f_forw.f_addr.sin_port = LogPort; 1083 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1084 f->f_type = F_FORW; 1085 break; 1086 1087 case '/': 1088 (void)strcpy(f->f_un.f_fname, p); 1089 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1090 f->f_file = F_UNUSED; 1091 logerror(p); 1092 break; 1093 } 1094 if (isatty(f->f_file)) 1095 f->f_type = F_TTY; 1096 else 1097 f->f_type = F_FILE; 1098 if (strcmp(p, ctty) == 0) 1099 f->f_type = F_CONSOLE; 1100 break; 1101 1102 case '*': 1103 f->f_type = F_WALL; 1104 break; 1105 1106 default: 1107 for (i = 0; i < MAXUNAMES && *p; i++) { 1108 for (q = p; *q && *q != ','; ) 1109 q++; 1110 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1111 if ((q - p) > UT_NAMESIZE) 1112 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1113 else 1114 f->f_un.f_uname[i][q - p] = '\0'; 1115 while (*q == ',' || *q == ' ') 1116 q++; 1117 p = q; 1118 } 1119 f->f_type = F_USERS; 1120 break; 1121 } 1122 } 1123 1124 1125 /* 1126 * Decode a symbolic name to a numeric value 1127 */ 1128 int 1129 decode(name, codetab) 1130 const char *name; 1131 CODE *codetab; 1132 { 1133 CODE *c; 1134 char *p, buf[40]; 1135 1136 if (isdigit(*name)) 1137 return (atoi(name)); 1138 1139 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1140 if (isupper(*name)) 1141 *p = tolower(*name); 1142 else 1143 *p = *name; 1144 } 1145 *p = '\0'; 1146 for (c = codetab; c->c_name; c++) 1147 if (!strcmp(buf, c->c_name)) 1148 return (c->c_val); 1149 1150 return (-1); 1151 } 1152