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 1.21 1998/07/30 23:29:29 tron 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 #include <sys/sysctl.h> 88 89 #include <netinet/in.h> 90 #include <netdb.h> 91 #include <arpa/inet.h> 92 93 #include <ctype.h> 94 #include <errno.h> 95 #include <fcntl.h> 96 #include <setjmp.h> 97 #include <signal.h> 98 #include <stdio.h> 99 #include <stdlib.h> 100 #include <string.h> 101 #include <unistd.h> 102 #include <utmp.h> 103 #include <util.h> 104 #include "pathnames.h" 105 106 #define SYSLOG_NAMES 107 #include <sys/syslog.h> 108 109 char *LogName = _PATH_LOG; 110 char *ConfFile = _PATH_LOGCONF; 111 char *PidFile = _PATH_LOGPID; 112 char ctty[] = _PATH_CONSOLE; 113 114 #define FDMASK(fd) (1 << (fd)) 115 116 #define dprintf if (Debug) printf 117 118 #define MAXUNAMES 20 /* maximum number of user names */ 119 120 /* 121 * Flags to logmsg(). 122 */ 123 124 #define IGN_CONS 0x001 /* don't print on console */ 125 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 126 #define ADDDATE 0x004 /* add a date to the message */ 127 #define MARK 0x008 /* this message is a mark */ 128 129 /* 130 * This structure represents the files that will have log 131 * copies printed. 132 */ 133 134 struct filed { 135 struct filed *f_next; /* next in linked list */ 136 short f_type; /* entry type, see below */ 137 short f_file; /* file descriptor */ 138 time_t f_time; /* time this was last written */ 139 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 140 union { 141 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 142 struct { 143 char f_hname[MAXHOSTNAMELEN+1]; 144 struct sockaddr_in f_addr; 145 } f_forw; /* forwarding address */ 146 char f_fname[MAXPATHLEN]; 147 } f_un; 148 char f_prevline[MAXSVLINE]; /* last message logged */ 149 char f_lasttime[16]; /* time of last occurrence */ 150 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 151 int f_prevpri; /* pri of f_prevline */ 152 int f_prevlen; /* length of f_prevline */ 153 int f_prevcount; /* repetition cnt of prevline */ 154 int f_repeatcount; /* number of "repeated" msgs */ 155 }; 156 157 /* 158 * Intervals at which we flush out "message repeated" messages, 159 * in seconds after previous message is logged. After each flush, 160 * we move to the next interval until we reach the largest. 161 */ 162 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 163 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 164 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 165 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 166 (f)->f_repeatcount = MAXREPEAT; \ 167 } 168 169 /* values for f_type */ 170 #define F_UNUSED 0 /* unused entry */ 171 #define F_FILE 1 /* regular file */ 172 #define F_TTY 2 /* terminal */ 173 #define F_CONSOLE 3 /* console terminal */ 174 #define F_FORW 4 /* remote machine */ 175 #define F_USERS 5 /* list of users */ 176 #define F_WALL 6 /* everyone logged on */ 177 178 char *TypeNames[7] = { 179 "UNUSED", "FILE", "TTY", "CONSOLE", 180 "FORW", "USERS", "WALL" 181 }; 182 183 struct filed *Files; 184 struct filed consfile; 185 186 int Debug; /* debug flag */ 187 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 188 char *LocalDomain; /* our local domain name */ 189 int InetInuse = 0; /* non-zero if INET sockets are being used */ 190 int finet; /* Internet datagram socket */ 191 int LogPort; /* port number for INET connections */ 192 int Initialized = 0; /* set when we have initialized ourselves */ 193 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 194 int MarkSeq = 0; /* mark sequence number */ 195 int SecureMode = 0; /* when true, speak only unix domain socks */ 196 197 void cfline __P((char *, struct filed *)); 198 char *cvthname __P((struct sockaddr_in *)); 199 int decode __P((const char *, CODE *)); 200 void die __P((int)); 201 void domark __P((int)); 202 void fprintlog __P((struct filed *, int, char *)); 203 int getmsgbufsize __P((void)); 204 void init __P((int)); 205 void logerror __P((char *)); 206 void logmsg __P((int, char *, char *, int)); 207 void printline __P((char *, char *)); 208 void printsys __P((char *)); 209 void reapchild __P((int)); 210 void usage __P((void)); 211 void wallmsg __P((struct filed *, struct iovec *)); 212 int main __P((int, char *[])); 213 214 int 215 main(argc, argv) 216 int argc; 217 char *argv[]; 218 { 219 int ch, funix, i, inetm, fklog, klogm, len, linesize; 220 struct sockaddr_un sunx, fromunix; 221 struct sockaddr_in sin, frominet; 222 FILE *fp; 223 char *p, *line; 224 225 while ((ch = getopt(argc, argv, "dsf:m:p:")) != -1) 226 switch(ch) { 227 case 'd': /* debug */ 228 Debug++; 229 break; 230 case 'f': /* configuration file */ 231 ConfFile = optarg; 232 break; 233 case 'm': /* mark interval */ 234 MarkInterval = atoi(optarg) * 60; 235 break; 236 case 'p': /* path */ 237 LogName = optarg; 238 break; 239 case 's': /* no network mode */ 240 SecureMode++; 241 break; 242 case '?': 243 default: 244 usage(); 245 } 246 if ((argc -= optind) != 0) 247 usage(); 248 249 if (!Debug) 250 (void)daemon(0, 0); 251 else 252 setlinebuf(stdout); 253 254 consfile.f_type = F_CONSOLE; 255 (void)strcpy(consfile.f_un.f_fname, ctty); 256 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 257 LocalHostName[sizeof(LocalHostName) - 1] = '\0'; 258 if ((p = strchr(LocalHostName, '.')) != NULL) { 259 *p++ = '\0'; 260 LocalDomain = p; 261 } else 262 LocalDomain = ""; 263 linesize = getmsgbufsize(); 264 if (linesize < MAXLINE) 265 linesize = MAXLINE; 266 linesize++; 267 line = malloc(linesize); 268 if (line == NULL) { 269 logerror("couldn't allocate line buffer"); 270 die(0); 271 } 272 (void)signal(SIGTERM, die); 273 (void)signal(SIGINT, Debug ? die : SIG_IGN); 274 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 275 (void)signal(SIGCHLD, reapchild); 276 (void)signal(SIGALRM, domark); 277 (void)alarm(TIMERINTVL); 278 (void)unlink(LogName); 279 280 #ifndef SUN_LEN 281 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 282 #endif 283 memset(&sunx, 0, sizeof(sunx)); 284 sunx.sun_family = AF_LOCAL; 285 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 286 funix = socket(AF_LOCAL, SOCK_DGRAM, 0); 287 if (funix < 0 || 288 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 289 chmod(LogName, 0666) < 0) { 290 (void)snprintf(line, sizeof line, "cannot create %s", LogName); 291 logerror(line); 292 dprintf("cannot create %s (%d)\n", LogName, errno); 293 die(0); 294 } 295 296 if (!SecureMode) 297 finet = socket(AF_INET, SOCK_DGRAM, 0); 298 else 299 finet = -1; 300 301 inetm = 0; 302 if (finet >= 0) { 303 struct servent *sp; 304 305 sp = getservbyname("syslog", "udp"); 306 if (sp == NULL) { 307 errno = 0; 308 logerror("syslog/udp: unknown service"); 309 die(0); 310 } 311 memset(&sin, 0, sizeof(sin)); 312 sin.sin_family = AF_INET; 313 sin.sin_port = LogPort = sp->s_port; 314 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 315 logerror("bind"); 316 if (!Debug) 317 die(0); 318 } else { 319 inetm = FDMASK(finet); 320 InetInuse = 1; 321 } 322 } 323 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 324 klogm = FDMASK(fklog); 325 else { 326 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 327 klogm = 0; 328 } 329 330 /* tuck my process id away, if i'm not in debug mode */ 331 if (Debug == 0) { 332 fp = fopen(PidFile, "w"); 333 if (fp != NULL) { 334 fprintf(fp, "%d\n", getpid()); 335 (void) fclose(fp); 336 } 337 } 338 339 dprintf("off & running....\n"); 340 341 init(0); 342 (void)signal(SIGHUP, init); 343 344 for (;;) { 345 int nfds, readfds = FDMASK(funix) | inetm | klogm; 346 347 dprintf("readfds = %#x\n", readfds); 348 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 349 (fd_set *)NULL, (struct timeval *)NULL); 350 if (nfds == 0) 351 continue; 352 if (nfds < 0) { 353 if (errno != EINTR) 354 logerror("select"); 355 continue; 356 } 357 dprintf("got a message (%d, %#x)\n", nfds, readfds); 358 if (readfds & klogm) { 359 i = read(fklog, line, linesize - 1); 360 if (i > 0) { 361 line[i] = '\0'; 362 printsys(line); 363 } else if (i < 0 && errno != EINTR) { 364 logerror("klog"); 365 fklog = -1; 366 klogm = 0; 367 } 368 } 369 if (readfds & FDMASK(funix)) { 370 len = sizeof(fromunix); 371 i = recvfrom(funix, line, MAXLINE, 0, 372 (struct sockaddr *)&fromunix, &len); 373 if (i > 0) { 374 line[i] = '\0'; 375 printline(LocalHostName, line); 376 } else if (i < 0 && errno != EINTR) 377 logerror("recvfrom unix"); 378 } 379 if (readfds & inetm) { 380 len = sizeof(frominet); 381 i = recvfrom(finet, line, MAXLINE, 0, 382 (struct sockaddr *)&frominet, &len); 383 if (i > 0) { 384 line[i] = '\0'; 385 printline(cvthname(&frominet), line); 386 } else if (i < 0 && errno != EINTR) 387 logerror("recvfrom inet"); 388 } 389 } 390 } 391 392 void 393 usage() 394 { 395 396 (void)fprintf(stderr, 397 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); 398 exit(1); 399 } 400 401 /* 402 * Take a raw input line, decode the message, and print the message 403 * on the appropriate log files. 404 */ 405 void 406 printline(hname, msg) 407 char *hname; 408 char *msg; 409 { 410 int c, pri; 411 char *p, *q, line[MAXLINE + 1]; 412 413 /* test for special codes */ 414 pri = DEFUPRI; 415 p = msg; 416 if (*p == '<') { 417 pri = 0; 418 while (isdigit(*++p)) 419 pri = 10 * pri + (*p - '0'); 420 if (*p == '>') 421 ++p; 422 } 423 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 424 pri = DEFUPRI; 425 426 /* don't allow users to log kernel messages */ 427 if (LOG_FAC(pri) == LOG_KERN) 428 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 429 430 q = line; 431 432 while ((c = *p++ & 0177) != '\0' && 433 q < &line[sizeof(line) - 1]) 434 if (iscntrl(c)) 435 if (c == '\n') 436 *q++ = ' '; 437 else if (c == '\t') 438 *q++ = '\t'; 439 else { 440 *q++ = '^'; 441 *q++ = c ^ 0100; 442 } 443 else 444 *q++ = c; 445 *q = '\0'; 446 447 logmsg(pri, line, hname, 0); 448 } 449 450 /* 451 * Take a raw input line from /dev/klog, split and format similar to syslog(). 452 */ 453 void 454 printsys(msg) 455 char *msg; 456 { 457 int c, pri, flags; 458 char *lp, *p, *q, line[MAXLINE + 1]; 459 460 (void)strcpy(line, _PATH_UNIX); 461 (void)strcat(line, ": "); 462 lp = line + strlen(line); 463 for (p = msg; *p != '\0'; ) { 464 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 465 pri = DEFSPRI; 466 if (*p == '<') { 467 pri = 0; 468 while (isdigit(*++p)) 469 pri = 10 * pri + (*p - '0'); 470 if (*p == '>') 471 ++p; 472 } else { 473 /* kernel printf's come out on console */ 474 flags |= IGN_CONS; 475 } 476 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 477 pri = DEFSPRI; 478 q = lp; 479 while (*p != '\0' && (c = *p++) != '\n' && 480 q < &line[MAXLINE]) 481 *q++ = c; 482 *q = '\0'; 483 logmsg(pri, line, LocalHostName, flags); 484 } 485 } 486 487 time_t now; 488 489 /* 490 * Log a message to the appropriate log files, users, etc. based on 491 * the priority. 492 */ 493 void 494 logmsg(pri, msg, from, flags) 495 int pri; 496 char *msg, *from; 497 int flags; 498 { 499 struct filed *f; 500 int fac, msglen, omask, prilev; 501 char *timestamp; 502 503 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 504 pri, flags, from, msg); 505 506 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 507 508 /* 509 * Check to see if msg looks non-standard. 510 */ 511 msglen = strlen(msg); 512 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 513 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 514 flags |= ADDDATE; 515 516 (void)time(&now); 517 if (flags & ADDDATE) 518 timestamp = ctime(&now) + 4; 519 else { 520 timestamp = msg; 521 msg += 16; 522 msglen -= 16; 523 } 524 525 /* extract facility and priority level */ 526 if (flags & MARK) 527 fac = LOG_NFACILITIES; 528 else 529 fac = LOG_FAC(pri); 530 prilev = LOG_PRI(pri); 531 532 /* log the message to the particular outputs */ 533 if (!Initialized) { 534 f = &consfile; 535 f->f_file = open(ctty, O_WRONLY, 0); 536 537 if (f->f_file >= 0) { 538 fprintlog(f, flags, msg); 539 (void)close(f->f_file); 540 } 541 (void)sigsetmask(omask); 542 return; 543 } 544 for (f = Files; f; f = f->f_next) { 545 /* skip messages that are incorrect priority */ 546 if (f->f_pmask[fac] < prilev || 547 f->f_pmask[fac] == INTERNAL_NOPRI) 548 continue; 549 550 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 551 continue; 552 553 /* don't output marks to recently written files */ 554 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 555 continue; 556 557 /* 558 * suppress duplicate lines to this file 559 */ 560 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 561 !strcmp(msg, f->f_prevline) && 562 !strcmp(from, f->f_prevhost)) { 563 (void)strncpy(f->f_lasttime, timestamp, 15); 564 f->f_prevcount++; 565 dprintf("msg repeated %d times, %ld sec of %d\n", 566 f->f_prevcount, (long)(now - f->f_time), 567 repeatinterval[f->f_repeatcount]); 568 /* 569 * If domark would have logged this by now, 570 * flush it now (so we don't hold isolated messages), 571 * but back off so we'll flush less often 572 * in the future. 573 */ 574 if (now > REPEATTIME(f)) { 575 fprintlog(f, flags, (char *)NULL); 576 BACKOFF(f); 577 } 578 } else { 579 /* new line, save it */ 580 if (f->f_prevcount) 581 fprintlog(f, 0, (char *)NULL); 582 f->f_repeatcount = 0; 583 f->f_prevpri = pri; 584 (void)strncpy(f->f_lasttime, timestamp, 15); 585 (void)strncpy(f->f_prevhost, from, 586 sizeof(f->f_prevhost)); 587 if (msglen < MAXSVLINE) { 588 f->f_prevlen = msglen; 589 (void)strcpy(f->f_prevline, msg); 590 fprintlog(f, flags, (char *)NULL); 591 } else { 592 f->f_prevline[0] = 0; 593 f->f_prevlen = 0; 594 fprintlog(f, flags, msg); 595 } 596 } 597 } 598 (void)sigsetmask(omask); 599 } 600 601 void 602 fprintlog(f, flags, msg) 603 struct filed *f; 604 int flags; 605 char *msg; 606 { 607 struct iovec iov[6]; 608 struct iovec *v; 609 int l; 610 char line[MAXLINE + 1], repbuf[80], greetings[200]; 611 612 v = iov; 613 if (f->f_type == F_WALL) { 614 v->iov_base = greetings; 615 v->iov_len = snprintf(greetings, sizeof greetings, 616 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 617 f->f_prevhost, ctime(&now)); 618 v++; 619 v->iov_base = ""; 620 v->iov_len = 0; 621 v++; 622 } else { 623 v->iov_base = f->f_lasttime; 624 v->iov_len = 15; 625 v++; 626 v->iov_base = " "; 627 v->iov_len = 1; 628 v++; 629 } 630 v->iov_base = f->f_prevhost; 631 v->iov_len = strlen(v->iov_base); 632 v++; 633 v->iov_base = " "; 634 v->iov_len = 1; 635 v++; 636 637 if (msg) { 638 v->iov_base = msg; 639 v->iov_len = strlen(msg); 640 } else if (f->f_prevcount > 1) { 641 v->iov_base = repbuf; 642 v->iov_len = snprintf(repbuf, sizeof repbuf, 643 "last message repeated %d times", f->f_prevcount); 644 } else { 645 v->iov_base = f->f_prevline; 646 v->iov_len = f->f_prevlen; 647 } 648 v++; 649 650 dprintf("Logging to %s", TypeNames[f->f_type]); 651 f->f_time = now; 652 653 switch (f->f_type) { 654 case F_UNUSED: 655 dprintf("\n"); 656 break; 657 658 case F_FORW: 659 dprintf(" %s\n", f->f_un.f_forw.f_hname); 660 /* check for local vs remote messages (from FreeBSD PR#bin/7055) */ 661 if (strcmp(f->f_prevhost, LocalHostName)) { 662 l = snprintf(line, sizeof(line) - 1, 663 "<%d>%.15s [%s]: %s", 664 f->f_prevpri, (char *) iov[0].iov_base, 665 f->f_prevhost, (char *) iov[4].iov_base); 666 } else { 667 l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s", 668 f->f_prevpri, (char *) iov[0].iov_base, 669 (char *) iov[4].iov_base); 670 } 671 if (l > MAXLINE) 672 l = MAXLINE; 673 if ((finet >= 0) && 674 (sendto(finet, line, l, 0, 675 (struct sockaddr *)&f->f_un.f_forw.f_addr, 676 sizeof(f->f_un.f_forw.f_addr)) != l)) { 677 int e = errno; 678 f->f_type = F_UNUSED; 679 errno = e; 680 logerror("sendto"); 681 } 682 break; 683 684 case F_CONSOLE: 685 if (flags & IGN_CONS) { 686 dprintf(" (ignored)\n"); 687 break; 688 } 689 /* FALLTHROUGH */ 690 691 case F_TTY: 692 case F_FILE: 693 dprintf(" %s\n", f->f_un.f_fname); 694 if (f->f_type != F_FILE) { 695 v->iov_base = "\r\n"; 696 v->iov_len = 2; 697 } else { 698 v->iov_base = "\n"; 699 v->iov_len = 1; 700 } 701 again: 702 if (writev(f->f_file, iov, 6) < 0) { 703 int e = errno; 704 (void)close(f->f_file); 705 /* 706 * Check for errors on TTY's due to loss of tty 707 */ 708 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 709 f->f_file = open(f->f_un.f_fname, 710 O_WRONLY|O_APPEND, 0); 711 if (f->f_file < 0) { 712 f->f_type = F_UNUSED; 713 logerror(f->f_un.f_fname); 714 } else 715 goto again; 716 } else { 717 f->f_type = F_UNUSED; 718 errno = e; 719 logerror(f->f_un.f_fname); 720 } 721 } else if (flags & SYNC_FILE) 722 (void)fsync(f->f_file); 723 break; 724 725 case F_USERS: 726 case F_WALL: 727 dprintf("\n"); 728 v->iov_base = "\r\n"; 729 v->iov_len = 2; 730 wallmsg(f, iov); 731 break; 732 } 733 f->f_prevcount = 0; 734 } 735 736 /* 737 * WALLMSG -- Write a message to the world at large 738 * 739 * Write the specified message to either the entire 740 * world, or a list of approved users. 741 */ 742 void 743 wallmsg(f, iov) 744 struct filed *f; 745 struct iovec *iov; 746 { 747 static int reenter; /* avoid calling ourselves */ 748 FILE *uf; 749 struct utmp ut; 750 int i; 751 char *p; 752 char line[sizeof(ut.ut_line) + 1]; 753 754 if (reenter++) 755 return; 756 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 757 logerror(_PATH_UTMP); 758 reenter = 0; 759 return; 760 } 761 /* NOSTRICT */ 762 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 763 if (ut.ut_name[0] == '\0') 764 continue; 765 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 766 line[sizeof(ut.ut_line)] = '\0'; 767 if (f->f_type == F_WALL) { 768 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 769 errno = 0; /* already in msg */ 770 logerror(p); 771 } 772 continue; 773 } 774 /* should we send the message to this user? */ 775 for (i = 0; i < MAXUNAMES; i++) { 776 if (!f->f_un.f_uname[i][0]) 777 break; 778 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 779 UT_NAMESIZE)) { 780 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 781 != NULL) { 782 errno = 0; /* already in msg */ 783 logerror(p); 784 } 785 break; 786 } 787 } 788 } 789 (void)fclose(uf); 790 reenter = 0; 791 } 792 793 void 794 reapchild(signo) 795 int signo; 796 { 797 union wait status; 798 799 while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0) 800 ; 801 } 802 803 /* 804 * Return a printable representation of a host address. 805 */ 806 char * 807 cvthname(f) 808 struct sockaddr_in *f; 809 { 810 struct hostent *hp; 811 char *p; 812 813 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 814 815 if (f->sin_family != AF_INET) { 816 dprintf("Malformed from address\n"); 817 return ("???"); 818 } 819 hp = gethostbyaddr((char *)&f->sin_addr, 820 sizeof(struct in_addr), f->sin_family); 821 if (hp == 0) { 822 dprintf("Host name for your address (%s) unknown\n", 823 inet_ntoa(f->sin_addr)); 824 return (inet_ntoa(f->sin_addr)); 825 } 826 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 827 *p = '\0'; 828 return (hp->h_name); 829 } 830 831 void 832 domark(signo) 833 int signo; 834 { 835 struct filed *f; 836 837 now = time((time_t *)NULL); 838 MarkSeq += TIMERINTVL; 839 if (MarkSeq >= MarkInterval) { 840 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 841 MarkSeq = 0; 842 } 843 844 for (f = Files; f; f = f->f_next) { 845 if (f->f_prevcount && now >= REPEATTIME(f)) { 846 dprintf("flush %s: repeated %d times, %d sec.\n", 847 TypeNames[f->f_type], f->f_prevcount, 848 repeatinterval[f->f_repeatcount]); 849 fprintlog(f, 0, (char *)NULL); 850 BACKOFF(f); 851 } 852 } 853 (void)alarm(TIMERINTVL); 854 } 855 856 /* 857 * Print syslogd errors some place. 858 */ 859 void 860 logerror(type) 861 char *type; 862 { 863 char buf[100]; 864 865 if (errno) 866 (void)snprintf(buf, 867 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 868 else 869 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 870 errno = 0; 871 dprintf("%s\n", buf); 872 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 873 } 874 875 void 876 die(signo) 877 int signo; 878 { 879 struct filed *f; 880 char buf[100]; 881 882 for (f = Files; f != NULL; f = f->f_next) { 883 /* flush any pending output */ 884 if (f->f_prevcount) 885 fprintlog(f, 0, (char *)NULL); 886 } 887 if (signo) { 888 dprintf("syslogd: exiting on signal %d\n", signo); 889 (void)snprintf(buf, sizeof buf, "exiting on signal %d", signo); 890 errno = 0; 891 logerror(buf); 892 } 893 (void)unlink(LogName); 894 exit(0); 895 } 896 897 /* 898 * INIT -- Initialize syslogd from configuration table 899 */ 900 void 901 init(signo) 902 int signo; 903 { 904 int i; 905 FILE *cf; 906 struct filed *f, *next, **nextp; 907 char *p; 908 char cline[LINE_MAX]; 909 910 dprintf("init\n"); 911 912 /* 913 * Close all open log files. 914 */ 915 Initialized = 0; 916 for (f = Files; f != NULL; f = next) { 917 /* flush any pending output */ 918 if (f->f_prevcount) 919 fprintlog(f, 0, (char *)NULL); 920 921 switch (f->f_type) { 922 case F_FILE: 923 case F_TTY: 924 case F_CONSOLE: 925 (void)close(f->f_file); 926 break; 927 } 928 next = f->f_next; 929 free((char *)f); 930 } 931 Files = NULL; 932 nextp = &Files; 933 934 /* open the configuration file */ 935 if ((cf = fopen(ConfFile, "r")) == NULL) { 936 dprintf("cannot open %s\n", ConfFile); 937 *nextp = (struct filed *)calloc(1, sizeof(*f)); 938 cfline("*.ERR\t/dev/console", *nextp); 939 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 940 cfline("*.PANIC\t*", (*nextp)->f_next); 941 Initialized = 1; 942 return; 943 } 944 945 /* 946 * Foreach line in the conf table, open that file. 947 */ 948 f = NULL; 949 while (fgets(cline, sizeof(cline), cf) != NULL) { 950 /* 951 * check for end-of-section, comments, strip off trailing 952 * spaces and newline character. 953 */ 954 for (p = cline; isspace(*p); ++p) 955 continue; 956 if (*p == '\0' || *p == '#') 957 continue; 958 for (p = strchr(cline, '\0'); isspace(*--p);) 959 continue; 960 *++p = '\0'; 961 f = (struct filed *)calloc(1, sizeof(*f)); 962 *nextp = f; 963 nextp = &f->f_next; 964 cfline(cline, f); 965 } 966 967 /* close the configuration file */ 968 (void)fclose(cf); 969 970 Initialized = 1; 971 972 if (Debug) { 973 for (f = Files; f; f = f->f_next) { 974 for (i = 0; i <= LOG_NFACILITIES; i++) 975 if (f->f_pmask[i] == INTERNAL_NOPRI) 976 printf("X "); 977 else 978 printf("%d ", f->f_pmask[i]); 979 printf("%s: ", TypeNames[f->f_type]); 980 switch (f->f_type) { 981 case F_FILE: 982 case F_TTY: 983 case F_CONSOLE: 984 printf("%s", f->f_un.f_fname); 985 break; 986 987 case F_FORW: 988 printf("%s", f->f_un.f_forw.f_hname); 989 break; 990 991 case F_USERS: 992 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 993 printf("%s, ", f->f_un.f_uname[i]); 994 break; 995 } 996 printf("\n"); 997 } 998 } 999 1000 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1001 dprintf("syslogd: restarted\n"); 1002 } 1003 1004 /* 1005 * Crack a configuration file line 1006 */ 1007 void 1008 cfline(line, f) 1009 char *line; 1010 struct filed *f; 1011 { 1012 struct hostent *hp; 1013 int i, pri; 1014 char *bp, *p, *q; 1015 char buf[MAXLINE], ebuf[100]; 1016 1017 dprintf("cfline(%s)\n", line); 1018 1019 errno = 0; /* keep strerror() stuff out of logerror messages */ 1020 1021 /* clear out file entry */ 1022 memset(f, 0, sizeof(*f)); 1023 for (i = 0; i <= LOG_NFACILITIES; i++) 1024 f->f_pmask[i] = INTERNAL_NOPRI; 1025 1026 /* scan through the list of selectors */ 1027 for (p = line; *p && *p != '\t';) { 1028 1029 /* find the end of this facility name list */ 1030 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1031 continue; 1032 1033 /* collect priority name */ 1034 for (bp = buf; *q && !strchr("\t,;", *q); ) 1035 *bp++ = *q++; 1036 *bp = '\0'; 1037 1038 /* skip cruft */ 1039 while (strchr(", ;", *q)) 1040 q++; 1041 1042 /* decode priority name */ 1043 if (*buf == '*') 1044 pri = LOG_PRIMASK + 1; 1045 else { 1046 pri = decode(buf, prioritynames); 1047 if (pri < 0) { 1048 (void)snprintf(ebuf, sizeof ebuf, 1049 "unknown priority name \"%s\"", buf); 1050 logerror(ebuf); 1051 return; 1052 } 1053 } 1054 1055 /* scan facilities */ 1056 while (*p && !strchr("\t.;", *p)) { 1057 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1058 *bp++ = *p++; 1059 *bp = '\0'; 1060 if (*buf == '*') 1061 for (i = 0; i < LOG_NFACILITIES; i++) 1062 f->f_pmask[i] = pri; 1063 else { 1064 i = decode(buf, facilitynames); 1065 if (i < 0) { 1066 (void)snprintf(ebuf, sizeof ebuf, 1067 "unknown facility name \"%s\"", 1068 buf); 1069 logerror(ebuf); 1070 return; 1071 } 1072 f->f_pmask[i >> 3] = pri; 1073 } 1074 while (*p == ',' || *p == ' ') 1075 p++; 1076 } 1077 1078 p = q; 1079 } 1080 1081 /* skip to action part */ 1082 while (*p == '\t') 1083 p++; 1084 1085 switch (*p) 1086 { 1087 case '@': 1088 if (!InetInuse) 1089 break; 1090 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1091 hp = gethostbyname(p); 1092 if (hp == NULL) { 1093 extern int h_errno; 1094 1095 logerror((char *)hstrerror(h_errno)); 1096 break; 1097 } 1098 memset(&f->f_un.f_forw.f_addr, 0, 1099 sizeof(f->f_un.f_forw.f_addr)); 1100 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1101 f->f_un.f_forw.f_addr.sin_port = LogPort; 1102 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1103 f->f_type = F_FORW; 1104 break; 1105 1106 case '/': 1107 (void)strcpy(f->f_un.f_fname, p); 1108 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1109 f->f_type = F_UNUSED; 1110 logerror(p); 1111 break; 1112 } 1113 if (isatty(f->f_file)) 1114 f->f_type = F_TTY; 1115 else 1116 f->f_type = F_FILE; 1117 if (strcmp(p, ctty) == 0) 1118 f->f_type = F_CONSOLE; 1119 break; 1120 1121 case '*': 1122 f->f_type = F_WALL; 1123 break; 1124 1125 default: 1126 for (i = 0; i < MAXUNAMES && *p; i++) { 1127 for (q = p; *q && *q != ','; ) 1128 q++; 1129 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1130 if ((q - p) > UT_NAMESIZE) 1131 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1132 else 1133 f->f_un.f_uname[i][q - p] = '\0'; 1134 while (*q == ',' || *q == ' ') 1135 q++; 1136 p = q; 1137 } 1138 f->f_type = F_USERS; 1139 break; 1140 } 1141 } 1142 1143 1144 /* 1145 * Decode a symbolic name to a numeric value 1146 */ 1147 int 1148 decode(name, codetab) 1149 const char *name; 1150 CODE *codetab; 1151 { 1152 CODE *c; 1153 char *p, buf[40]; 1154 1155 if (isdigit(*name)) 1156 return (atoi(name)); 1157 1158 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1159 if (isupper(*name)) 1160 *p = tolower(*name); 1161 else 1162 *p = *name; 1163 } 1164 *p = '\0'; 1165 for (c = codetab; c->c_name; c++) 1166 if (!strcmp(buf, c->c_name)) 1167 return (c->c_val); 1168 1169 return (-1); 1170 } 1171 1172 /* 1173 * Retrieve the size of the kernel message buffer, via sysctl. 1174 */ 1175 int 1176 getmsgbufsize() 1177 { 1178 int msgbufsize, mib[2]; 1179 size_t size; 1180 1181 mib[0] = CTL_KERN; 1182 mib[1] = KERN_MSGBUFSIZE; 1183 size = sizeof msgbufsize; 1184 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 1185 dprintf("couldn't get kern.msgbufsize\n"); 1186 return (0); 1187 } 1188 return (msgbufsize); 1189 } 1190