1 /* $NetBSD: syslogd.c,v 1.33 1999/12/13 04:25:08 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 45 #else 46 __RCSID("$NetBSD: syslogd.c,v 1.33 1999/12/13 04:25:08 itojun Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * syslogd -- log system messages 52 * 53 * This program implements a system log. It takes a series of lines. 54 * Each line may have a priority, signified as "<n>" as 55 * the first characters of the line. If this is 56 * not present, a default priority is used. 57 * 58 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 59 * cause it to reread its configuration file. 60 * 61 * Defined Constants: 62 * 63 * MAXLINE -- the maximimum line length that can be handled. 64 * DEFUPRI -- the default priority for user messages 65 * DEFSPRI -- the default priority for kernel messages 66 * 67 * Author: Eric Allman 68 * extensive changes by Ralph Campbell 69 * more extensive changes by Eric Allman (again) 70 */ 71 72 #define MAXLINE 1024 /* maximum line length */ 73 #define MAXSVLINE 120 /* maximum saved line length */ 74 #define DEFUPRI (LOG_USER|LOG_NOTICE) 75 #define DEFSPRI (LOG_KERN|LOG_CRIT) 76 #define TIMERINTVL 30 /* interval for checking flush, mark */ 77 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/stat.h> 82 #include <sys/wait.h> 83 #include <sys/socket.h> 84 #include <sys/msgbuf.h> 85 #include <sys/uio.h> 86 #include <sys/poll.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/sysctl.h> 91 92 #include <netinet/in.h> 93 #include <netdb.h> 94 #include <arpa/inet.h> 95 96 #include <ctype.h> 97 #include <errno.h> 98 #include <fcntl.h> 99 #include <setjmp.h> 100 #include <signal.h> 101 #include <stdio.h> 102 #include <stdlib.h> 103 #include <string.h> 104 #include <unistd.h> 105 #include <utmp.h> 106 #include <util.h> 107 #include "pathnames.h" 108 109 #define SYSLOG_NAMES 110 #include <sys/syslog.h> 111 112 char *ConfFile = _PATH_LOGCONF; 113 char ctty[] = _PATH_CONSOLE; 114 115 #define FDMASK(fd) (1 << (fd)) 116 117 #define dprintf if (Debug) printf 118 119 #define MAXUNAMES 20 /* maximum number of user names */ 120 121 /* 122 * Flags to logmsg(). 123 */ 124 125 #define IGN_CONS 0x001 /* don't print on console */ 126 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 127 #define ADDDATE 0x004 /* add a date to the message */ 128 #define MARK 0x008 /* this message is a mark */ 129 130 /* 131 * This structure represents the files that will have log 132 * copies printed. 133 */ 134 135 struct filed { 136 struct filed *f_next; /* next in linked list */ 137 short f_type; /* entry type, see below */ 138 short f_file; /* file descriptor */ 139 time_t f_time; /* time this was last written */ 140 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 141 union { 142 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 143 struct { 144 char f_hname[MAXHOSTNAMELEN+1]; 145 struct addrinfo *f_addr; 146 } f_forw; /* forwarding address */ 147 char f_fname[MAXPATHLEN]; 148 } f_un; 149 char f_prevline[MAXSVLINE]; /* last message logged */ 150 char f_lasttime[16]; /* time of last occurrence */ 151 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 152 int f_prevpri; /* pri of f_prevline */ 153 int f_prevlen; /* length of f_prevline */ 154 int f_prevcount; /* repetition cnt of prevline */ 155 int f_repeatcount; /* number of "repeated" msgs */ 156 }; 157 158 /* 159 * Intervals at which we flush out "message repeated" messages, 160 * in seconds after previous message is logged. After each flush, 161 * we move to the next interval until we reach the largest. 162 */ 163 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 164 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 165 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 166 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 167 (f)->f_repeatcount = MAXREPEAT; \ 168 } 169 170 /* values for f_type */ 171 #define F_UNUSED 0 /* unused entry */ 172 #define F_FILE 1 /* regular file */ 173 #define F_TTY 2 /* terminal */ 174 #define F_CONSOLE 3 /* console terminal */ 175 #define F_FORW 4 /* remote machine */ 176 #define F_USERS 5 /* list of users */ 177 #define F_WALL 6 /* everyone logged on */ 178 179 char *TypeNames[7] = { 180 "UNUSED", "FILE", "TTY", "CONSOLE", 181 "FORW", "USERS", "WALL" 182 }; 183 184 struct filed *Files; 185 struct filed consfile; 186 187 int Debug; /* debug flag */ 188 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 189 char *LocalDomain; /* our local domain name */ 190 int InetInuse = 0; /* non-zero if INET sockets are being used */ 191 int *finet; /* Internet datagram socket */ 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 char **LogPaths; /* array of pathnames to read messages from */ 197 198 void cfline __P((char *, struct filed *)); 199 char *cvthname __P((struct sockaddr_storage *)); 200 int decode __P((const char *, CODE *)); 201 void die __P((int)); 202 void domark __P((int)); 203 void fprintlog __P((struct filed *, int, char *)); 204 int getmsgbufsize __P((void)); 205 int* socksetup __P((int)); 206 void init __P((int)); 207 void logerror __P((char *)); 208 void logmsg __P((int, char *, char *, int)); 209 void printline __P((char *, char *)); 210 void printsys __P((char *)); 211 void reapchild __P((int)); 212 void usage __P((void)); 213 void wallmsg __P((struct filed *, struct iovec *)); 214 int main __P((int, char *[])); 215 void logpath_add __P((char ***, int *, int *, char *)); 216 void logpath_fileadd __P((char ***, int *, int *, char *)); 217 218 int 219 main(argc, argv) 220 int argc; 221 char *argv[]; 222 { 223 int ch, *funix, i, j, fklog, len, linesize; 224 int *nfinetix, nfklogix, nfunixbaseix, nfds; 225 int funixsize = 0, funixmaxsize = 0; 226 struct sockaddr_un sunx, fromunix; 227 struct sockaddr_storage frominet; 228 char *p, *line, **pp; 229 struct pollfd *readfds; 230 231 while ((ch = getopt(argc, argv, "dsf:m:p:P:")) != -1) 232 switch(ch) { 233 case 'd': /* debug */ 234 Debug++; 235 break; 236 case 'f': /* configuration file */ 237 ConfFile = optarg; 238 break; 239 case 'm': /* mark interval */ 240 MarkInterval = atoi(optarg) * 60; 241 break; 242 case 'p': /* path */ 243 logpath_add(&LogPaths, &funixsize, 244 &funixmaxsize, optarg); 245 break; 246 case 'P': /* file of paths */ 247 logpath_fileadd(&LogPaths, &funixsize, 248 &funixmaxsize, optarg); 249 break; 250 case 's': /* no network mode */ 251 SecureMode++; 252 break; 253 case '?': 254 default: 255 usage(); 256 } 257 if ((argc -= optind) != 0) 258 usage(); 259 260 if (!Debug) 261 (void)daemon(0, 0); 262 else 263 setlinebuf(stdout); 264 265 consfile.f_type = F_CONSOLE; 266 (void)strcpy(consfile.f_un.f_fname, ctty); 267 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 268 LocalHostName[sizeof(LocalHostName) - 1] = '\0'; 269 if ((p = strchr(LocalHostName, '.')) != NULL) { 270 *p++ = '\0'; 271 LocalDomain = p; 272 } else 273 LocalDomain = ""; 274 linesize = getmsgbufsize(); 275 if (linesize < MAXLINE) 276 linesize = MAXLINE; 277 linesize++; 278 line = malloc(linesize); 279 if (line == NULL) { 280 logerror("couldn't allocate line buffer"); 281 die(0); 282 } 283 (void)signal(SIGTERM, die); 284 (void)signal(SIGINT, Debug ? die : SIG_IGN); 285 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 286 (void)signal(SIGCHLD, reapchild); 287 (void)signal(SIGALRM, domark); 288 (void)alarm(TIMERINTVL); 289 290 #ifndef SUN_LEN 291 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 292 #endif 293 if (funixsize == 0) 294 logpath_add(&LogPaths, &funixsize, 295 &funixmaxsize, _PATH_LOG); 296 funix = (int *)malloc(sizeof(int) * funixsize); 297 if (funix == NULL) { 298 logerror("couldn't allocate funix descriptors"); 299 die(0); 300 } 301 for (j = 0, pp = LogPaths; *pp; pp++, j++) { 302 dprintf("making unix dgram socket %s\n", *pp); 303 unlink(*pp); 304 memset(&sunx, 0, sizeof(sunx)); 305 sunx.sun_family = AF_LOCAL; 306 (void)strncpy(sunx.sun_path, *pp, sizeof(sunx.sun_path)); 307 funix[j] = socket(AF_LOCAL, SOCK_DGRAM, 0); 308 if (funix[j] < 0 || bind(funix[j], 309 (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 310 chmod(*pp, 0666) < 0) { 311 int serrno = errno; 312 (void)snprintf(line, sizeof line, 313 "cannot create %s", *pp); 314 errno = serrno; 315 logerror(line); 316 errno = serrno; 317 dprintf("cannot create %s (%d)\n", *pp, errno); 318 die(0); 319 } 320 dprintf("listening on unix dgram socket %s\n", *pp); 321 } 322 323 if (!SecureMode) 324 finet = socksetup(PF_UNSPEC); 325 else 326 finet = NULL; 327 328 if (finet && *finet) { 329 dprintf("listening on inet and/or inet6 socket\n"); 330 InetInuse = 1; 331 } 332 333 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) { 334 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 335 } else { 336 dprintf("listening on kernel log %s\n", _PATH_KLOG); 337 } 338 339 /* tuck my process id away, if i'm not in debug mode */ 340 if (Debug == 0) 341 pidfile(NULL); 342 343 dprintf("off & running....\n"); 344 345 init(0); 346 (void)signal(SIGHUP, init); 347 348 /* setup pollfd set. */ 349 readfds = (struct pollfd *)malloc(sizeof(struct pollfd) * 350 (funixsize + (finet ? *finet : 0) + 1)); 351 if (readfds == NULL) { 352 logerror("couldn't allocate pollfds"); 353 die(0); 354 } 355 nfds = 0; 356 if (fklog >= 0) { 357 nfklogix = nfds++; 358 readfds[nfklogix].fd = fklog; 359 readfds[nfklogix].events = POLLIN | POLLPRI; 360 } 361 if (finet) { 362 nfinetix = malloc(*finet * sizeof(*nfinetix)); 363 for (j = 0; j < *finet; j++) { 364 nfinetix[j] = nfds++; 365 readfds[nfinetix[j]].fd = finet[j+1]; 366 readfds[nfinetix[j]].events = POLLIN | POLLPRI; 367 } 368 } 369 nfunixbaseix = nfds; 370 for (j = 0, pp = LogPaths; *pp; pp++) { 371 readfds[nfds].fd = funix[j++]; 372 readfds[nfds++].events = POLLIN | POLLPRI; 373 } 374 375 for (;;) { 376 int rv; 377 378 rv = poll(readfds, nfds, INFTIM); 379 if (rv == 0) 380 continue; 381 if (rv < 0) { 382 if (errno != EINTR) 383 logerror("poll"); 384 continue; 385 } 386 dprintf("got a message (%d)\n", rv); 387 if (fklog >= 0 && 388 (readfds[nfklogix].revents & (POLLIN | POLLPRI))) { 389 dprintf("kernel log active\n"); 390 i = read(fklog, line, linesize - 1); 391 if (i > 0) { 392 line[i] = '\0'; 393 printsys(line); 394 } else if (i < 0 && errno != EINTR) { 395 logerror("klog"); 396 fklog = -1; 397 } 398 } 399 for (j = 0, pp = LogPaths; *pp; pp++, j++) { 400 if ((readfds[nfunixbaseix + j].revents & 401 (POLLIN | POLLPRI)) == 0) 402 continue; 403 404 dprintf("unix socket (%s) active\n", *pp); 405 len = sizeof(fromunix); 406 i = recvfrom(funix[j], line, MAXLINE, 0, 407 (struct sockaddr *)&fromunix, &len); 408 if (i > 0) { 409 line[i] = '\0'; 410 printline(LocalHostName, line); 411 } else if (i < 0 && errno != EINTR) { 412 char buf[MAXPATHLEN]; 413 int serrno = errno; 414 415 (void)snprintf(buf, sizeof buf, 416 "recvfrom unix %s", *pp); 417 errno = serrno; 418 logerror(buf); 419 } 420 } 421 if (finet) { 422 for (j = 0; j < *finet; j++) { 423 if (readfds[nfinetix[j]].revents & (POLLIN | POLLPRI)) { 424 dprintf("inet socket active\n"); 425 len = sizeof(frominet); 426 i = recvfrom(finet[j+1], line, MAXLINE, 0, 427 (struct sockaddr *)&frominet, &len); 428 if (i > 0) { 429 line[i] = '\0'; 430 printline(cvthname(&frominet), line); 431 } else if (i < 0 && errno != EINTR) 432 logerror("recvfrom inet"); 433 } 434 } 435 } 436 } 437 } 438 439 void 440 usage() 441 { 442 443 (void)fprintf(stderr, 444 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath1] [-p logpath2 ..]\n"); 445 exit(1); 446 } 447 448 /* 449 * given a pointer to an array of char *'s, a pointer to it's current 450 * size and current allocated max size, and a new char * to add, add 451 * it, update everything as necessary, possibly allocating a new array 452 */ 453 void 454 logpath_add(lp, szp, maxszp, new) 455 char ***lp; 456 int *szp; 457 int *maxszp; 458 char *new; 459 { 460 461 dprintf("adding %s to the %p logpath list\n", new, *lp); 462 if (*szp == *maxszp) { 463 if (*maxszp == 0) { 464 *maxszp = 4; /* start of with enough for now */ 465 *lp = NULL; 466 } 467 else 468 *maxszp *= 2; 469 *lp = realloc(*lp, sizeof(char *) * (*maxszp + 1)); 470 if (*lp == NULL) { 471 logerror("couldn't allocate line buffer"); 472 die(0); 473 } 474 } 475 (*lp)[(*szp)++] = new; 476 (*lp)[(*szp)] = NULL; /* always keep it NULL terminated */ 477 } 478 479 /* do a file of log sockets */ 480 void 481 logpath_fileadd(lp, szp, maxszp, file) 482 char ***lp; 483 int *szp; 484 int *maxszp; 485 char *file; 486 { 487 FILE *fp; 488 char *line; 489 size_t len; 490 491 fp = fopen(file, "r"); 492 if (fp == NULL) { 493 int serrno = errno; 494 495 dprintf("can't open %s (%d)\n", file, errno); 496 errno = serrno; 497 logerror("could not open socket file list"); 498 die(0); 499 } 500 501 while ((line = fgetln(fp, &len))) { 502 line[len - 1] = 0; 503 logpath_add(lp, szp, maxszp, line); 504 } 505 fclose(fp); 506 } 507 508 /* 509 * Take a raw input line, decode the message, and print the message 510 * on the appropriate log files. 511 */ 512 void 513 printline(hname, msg) 514 char *hname; 515 char *msg; 516 { 517 int c, pri; 518 char *p, *q, line[MAXLINE + 1]; 519 520 /* test for special codes */ 521 pri = DEFUPRI; 522 p = msg; 523 if (*p == '<') { 524 pri = 0; 525 while (isdigit(*++p)) 526 pri = 10 * pri + (*p - '0'); 527 if (*p == '>') 528 ++p; 529 } 530 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 531 pri = DEFUPRI; 532 533 /* don't allow users to log kernel messages */ 534 if (LOG_FAC(pri) == LOG_KERN) 535 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 536 537 q = line; 538 539 while ((c = *p++ & 0177) != '\0' && 540 q < &line[sizeof(line) - 1]) 541 if (iscntrl(c)) 542 if (c == '\n') 543 *q++ = ' '; 544 else if (c == '\t') 545 *q++ = '\t'; 546 else { 547 *q++ = '^'; 548 *q++ = c ^ 0100; 549 } 550 else 551 *q++ = c; 552 *q = '\0'; 553 554 logmsg(pri, line, hname, 0); 555 } 556 557 /* 558 * Take a raw input line from /dev/klog, split and format similar to syslog(). 559 */ 560 void 561 printsys(msg) 562 char *msg; 563 { 564 int c, pri, flags; 565 char *lp, *p, *q, line[MAXLINE + 1]; 566 567 (void)strcpy(line, _PATH_UNIX); 568 (void)strcat(line, ": "); 569 lp = line + strlen(line); 570 for (p = msg; *p != '\0'; ) { 571 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 572 pri = DEFSPRI; 573 if (*p == '<') { 574 pri = 0; 575 while (isdigit(*++p)) 576 pri = 10 * pri + (*p - '0'); 577 if (*p == '>') 578 ++p; 579 } else { 580 /* kernel printf's come out on console */ 581 flags |= IGN_CONS; 582 } 583 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 584 pri = DEFSPRI; 585 q = lp; 586 while (*p != '\0' && (c = *p++) != '\n' && 587 q < &line[MAXLINE]) 588 *q++ = c; 589 *q = '\0'; 590 logmsg(pri, line, LocalHostName, flags); 591 } 592 } 593 594 time_t now; 595 596 /* 597 * Log a message to the appropriate log files, users, etc. based on 598 * the priority. 599 */ 600 void 601 logmsg(pri, msg, from, flags) 602 int pri; 603 char *msg, *from; 604 int flags; 605 { 606 struct filed *f; 607 int fac, msglen, omask, prilev; 608 char *timestamp; 609 610 dprintf("logmsg: pri 0%o, flags 0x%x, from %s, msg %s\n", 611 pri, flags, from, msg); 612 613 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 614 615 /* 616 * Check to see if msg looks non-standard. 617 */ 618 msglen = strlen(msg); 619 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 620 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 621 flags |= ADDDATE; 622 623 (void)time(&now); 624 if (flags & ADDDATE) 625 timestamp = ctime(&now) + 4; 626 else { 627 timestamp = msg; 628 msg += 16; 629 msglen -= 16; 630 } 631 632 /* extract facility and priority level */ 633 if (flags & MARK) 634 fac = LOG_NFACILITIES; 635 else 636 fac = LOG_FAC(pri); 637 prilev = LOG_PRI(pri); 638 639 /* log the message to the particular outputs */ 640 if (!Initialized) { 641 f = &consfile; 642 f->f_file = open(ctty, O_WRONLY, 0); 643 644 if (f->f_file >= 0) { 645 fprintlog(f, flags, msg); 646 (void)close(f->f_file); 647 } 648 (void)sigsetmask(omask); 649 return; 650 } 651 for (f = Files; f; f = f->f_next) { 652 /* skip messages that are incorrect priority */ 653 if (f->f_pmask[fac] < prilev || 654 f->f_pmask[fac] == INTERNAL_NOPRI) 655 continue; 656 657 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 658 continue; 659 660 /* don't output marks to recently written files */ 661 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 662 continue; 663 664 /* 665 * suppress duplicate lines to this file 666 */ 667 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 668 !strcmp(msg, f->f_prevline) && 669 !strcmp(from, f->f_prevhost)) { 670 (void)strncpy(f->f_lasttime, timestamp, 15); 671 f->f_prevcount++; 672 dprintf("msg repeated %d times, %ld sec of %d\n", 673 f->f_prevcount, (long)(now - f->f_time), 674 repeatinterval[f->f_repeatcount]); 675 /* 676 * If domark would have logged this by now, 677 * flush it now (so we don't hold isolated messages), 678 * but back off so we'll flush less often 679 * in the future. 680 */ 681 if (now > REPEATTIME(f)) { 682 fprintlog(f, flags, (char *)NULL); 683 BACKOFF(f); 684 } 685 } else { 686 /* new line, save it */ 687 if (f->f_prevcount) 688 fprintlog(f, 0, (char *)NULL); 689 f->f_repeatcount = 0; 690 f->f_prevpri = pri; 691 (void)strncpy(f->f_lasttime, timestamp, 15); 692 (void)strncpy(f->f_prevhost, from, 693 sizeof(f->f_prevhost)); 694 if (msglen < MAXSVLINE) { 695 f->f_prevlen = msglen; 696 (void)strcpy(f->f_prevline, msg); 697 fprintlog(f, flags, (char *)NULL); 698 } else { 699 f->f_prevline[0] = 0; 700 f->f_prevlen = 0; 701 fprintlog(f, flags, msg); 702 } 703 } 704 } 705 (void)sigsetmask(omask); 706 } 707 708 void 709 fprintlog(f, flags, msg) 710 struct filed *f; 711 int flags; 712 char *msg; 713 { 714 struct iovec iov[6]; 715 struct iovec *v; 716 struct addrinfo *r; 717 int j, l, lsent; 718 char line[MAXLINE + 1], repbuf[80], greetings[200]; 719 720 v = iov; 721 if (f->f_type == F_WALL) { 722 v->iov_base = greetings; 723 v->iov_len = snprintf(greetings, sizeof greetings, 724 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 725 f->f_prevhost, ctime(&now)); 726 v++; 727 v->iov_base = ""; 728 v->iov_len = 0; 729 v++; 730 } else { 731 v->iov_base = f->f_lasttime; 732 v->iov_len = 15; 733 v++; 734 v->iov_base = " "; 735 v->iov_len = 1; 736 v++; 737 } 738 v->iov_base = f->f_prevhost; 739 v->iov_len = strlen(v->iov_base); 740 v++; 741 v->iov_base = " "; 742 v->iov_len = 1; 743 v++; 744 745 if (msg) { 746 v->iov_base = msg; 747 v->iov_len = strlen(msg); 748 } else if (f->f_prevcount > 1) { 749 v->iov_base = repbuf; 750 v->iov_len = snprintf(repbuf, sizeof repbuf, 751 "last message repeated %d times", f->f_prevcount); 752 } else { 753 v->iov_base = f->f_prevline; 754 v->iov_len = f->f_prevlen; 755 } 756 v++; 757 758 dprintf("Logging to %s", TypeNames[f->f_type]); 759 f->f_time = now; 760 761 switch (f->f_type) { 762 case F_UNUSED: 763 dprintf("\n"); 764 break; 765 766 case F_FORW: 767 dprintf(" %s\n", f->f_un.f_forw.f_hname); 768 /* check for local vs remote messages (from FreeBSD PR#bin/7055) */ 769 if (strcmp(f->f_prevhost, LocalHostName)) { 770 l = snprintf(line, sizeof(line) - 1, 771 "<%d>%.15s [%s]: %s", 772 f->f_prevpri, (char *) iov[0].iov_base, 773 f->f_prevhost, (char *) iov[4].iov_base); 774 } else { 775 l = snprintf(line, sizeof(line) - 1, "<%d>%.15s %s", 776 f->f_prevpri, (char *) iov[0].iov_base, 777 (char *) iov[4].iov_base); 778 } 779 if (l > MAXLINE) 780 l = MAXLINE; 781 if (finet && *finet) { 782 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 783 for (j = 0; j < *finet; j++) { 784 #if 0 785 /* should we check AF first, or just trial and error? FWD */ 786 if (r->ai_family == address_family_of(finet[j+1])) 787 #endif 788 lsent = sendto(finet[j+1], line, l, 0, r->ai_addr, r->ai_addrlen); 789 if (lsent == l) 790 break; 791 } 792 } 793 if (lsent != l) { 794 f->f_type = F_UNUSED; 795 logerror("sendto"); 796 } 797 } 798 break; 799 800 case F_CONSOLE: 801 if (flags & IGN_CONS) { 802 dprintf(" (ignored)\n"); 803 break; 804 } 805 /* FALLTHROUGH */ 806 807 case F_TTY: 808 case F_FILE: 809 dprintf(" %s\n", f->f_un.f_fname); 810 if (f->f_type != F_FILE) { 811 v->iov_base = "\r\n"; 812 v->iov_len = 2; 813 } else { 814 v->iov_base = "\n"; 815 v->iov_len = 1; 816 } 817 again: 818 if (writev(f->f_file, iov, 6) < 0) { 819 int e = errno; 820 (void)close(f->f_file); 821 /* 822 * Check for errors on TTY's due to loss of tty 823 */ 824 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 825 f->f_file = open(f->f_un.f_fname, 826 O_WRONLY|O_APPEND, 0); 827 if (f->f_file < 0) { 828 f->f_type = F_UNUSED; 829 logerror(f->f_un.f_fname); 830 } else 831 goto again; 832 } else { 833 f->f_type = F_UNUSED; 834 errno = e; 835 logerror(f->f_un.f_fname); 836 } 837 } else if (flags & SYNC_FILE) 838 (void)fsync(f->f_file); 839 break; 840 841 case F_USERS: 842 case F_WALL: 843 dprintf("\n"); 844 v->iov_base = "\r\n"; 845 v->iov_len = 2; 846 wallmsg(f, iov); 847 break; 848 } 849 f->f_prevcount = 0; 850 } 851 852 /* 853 * WALLMSG -- Write a message to the world at large 854 * 855 * Write the specified message to either the entire 856 * world, or a list of approved users. 857 */ 858 void 859 wallmsg(f, iov) 860 struct filed *f; 861 struct iovec *iov; 862 { 863 static int reenter; /* avoid calling ourselves */ 864 FILE *uf; 865 struct utmp ut; 866 int i; 867 char *p; 868 char line[sizeof(ut.ut_line) + 1]; 869 870 if (reenter++) 871 return; 872 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 873 logerror(_PATH_UTMP); 874 reenter = 0; 875 return; 876 } 877 /* NOSTRICT */ 878 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 879 if (ut.ut_name[0] == '\0') 880 continue; 881 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 882 line[sizeof(ut.ut_line)] = '\0'; 883 if (f->f_type == F_WALL) { 884 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) != NULL) { 885 errno = 0; /* already in msg */ 886 logerror(p); 887 } 888 continue; 889 } 890 /* should we send the message to this user? */ 891 for (i = 0; i < MAXUNAMES; i++) { 892 if (!f->f_un.f_uname[i][0]) 893 break; 894 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 895 UT_NAMESIZE)) { 896 if ((p = ttymsg(iov, 6, line, TTYMSGTIME)) 897 != NULL) { 898 errno = 0; /* already in msg */ 899 logerror(p); 900 } 901 break; 902 } 903 } 904 } 905 (void)fclose(uf); 906 reenter = 0; 907 } 908 909 void 910 reapchild(signo) 911 int signo; 912 { 913 union wait status; 914 915 while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0) 916 ; 917 } 918 919 /* 920 * Return a printable representation of a host address. 921 */ 922 char * 923 cvthname(f) 924 struct sockaddr_storage *f; 925 { 926 int error; 927 char *p; 928 #ifdef KAME_SCOPEID 929 const int niflag = NI_DGRAM | NI_WITHSCOPEID; 930 #else 931 const int niflag = NI_DGRAM; 932 #endif 933 static char host[NI_MAXHOST], ip[NI_MAXHOST]; 934 935 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 936 ip, sizeof ip, NULL, 0, NI_NUMERICHOST|niflag); 937 938 dprintf("cvthname(%s)\n", ip); 939 940 if (error) { 941 dprintf("Malformed from address %s\n", gai_strerror(error)); 942 return ("???"); 943 } 944 945 error = getnameinfo((struct sockaddr*)f, ((struct sockaddr*)f)->sa_len, 946 host, sizeof host, NULL, 0, niflag); 947 if (error) { 948 dprintf("Host name for your address (%s) unknown\n", ip); 949 return (ip); 950 } 951 if ((p = strchr(host, '.')) && strcmp(p + 1, LocalDomain) == 0) 952 *p = '\0'; 953 return (host); 954 } 955 956 void 957 domark(signo) 958 int signo; 959 { 960 struct filed *f; 961 962 now = time((time_t *)NULL); 963 MarkSeq += TIMERINTVL; 964 if (MarkSeq >= MarkInterval) { 965 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 966 MarkSeq = 0; 967 } 968 969 for (f = Files; f; f = f->f_next) { 970 if (f->f_prevcount && now >= REPEATTIME(f)) { 971 dprintf("flush %s: repeated %d times, %d sec.\n", 972 TypeNames[f->f_type], f->f_prevcount, 973 repeatinterval[f->f_repeatcount]); 974 fprintlog(f, 0, (char *)NULL); 975 BACKOFF(f); 976 } 977 } 978 (void)alarm(TIMERINTVL); 979 } 980 981 /* 982 * Print syslogd errors some place. 983 */ 984 void 985 logerror(type) 986 char *type; 987 { 988 char buf[100]; 989 990 if (errno) 991 (void)snprintf(buf, 992 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 993 else 994 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 995 errno = 0; 996 dprintf("%s\n", buf); 997 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 998 } 999 1000 void 1001 die(signo) 1002 int signo; 1003 { 1004 struct filed *f; 1005 char buf[100], **p; 1006 1007 for (f = Files; f != NULL; f = f->f_next) { 1008 /* flush any pending output */ 1009 if (f->f_prevcount) 1010 fprintlog(f, 0, (char *)NULL); 1011 } 1012 if (signo) { 1013 dprintf("syslogd: exiting on signal %d\n", signo); 1014 (void)snprintf(buf, sizeof buf, "exiting on signal %d", signo); 1015 errno = 0; 1016 logerror(buf); 1017 } 1018 for (p = LogPaths; p && *p; p++) 1019 unlink(*p); 1020 exit(0); 1021 } 1022 1023 /* 1024 * INIT -- Initialize syslogd from configuration table 1025 */ 1026 void 1027 init(signo) 1028 int signo; 1029 { 1030 int i; 1031 FILE *cf; 1032 struct filed *f, *next, **nextp; 1033 char *p; 1034 char cline[LINE_MAX]; 1035 1036 dprintf("init\n"); 1037 1038 /* 1039 * Close all open log files. 1040 */ 1041 Initialized = 0; 1042 for (f = Files; f != NULL; f = next) { 1043 /* flush any pending output */ 1044 if (f->f_prevcount) 1045 fprintlog(f, 0, (char *)NULL); 1046 1047 switch (f->f_type) { 1048 case F_FILE: 1049 case F_TTY: 1050 case F_CONSOLE: 1051 (void)close(f->f_file); 1052 break; 1053 } 1054 next = f->f_next; 1055 free((char *)f); 1056 } 1057 Files = NULL; 1058 nextp = &Files; 1059 1060 /* open the configuration file */ 1061 if ((cf = fopen(ConfFile, "r")) == NULL) { 1062 dprintf("cannot open %s\n", ConfFile); 1063 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1064 cfline("*.ERR\t/dev/console", *nextp); 1065 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1066 cfline("*.PANIC\t*", (*nextp)->f_next); 1067 Initialized = 1; 1068 return; 1069 } 1070 1071 /* 1072 * Foreach line in the conf table, open that file. 1073 */ 1074 f = NULL; 1075 while (fgets(cline, sizeof(cline), cf) != NULL) { 1076 /* 1077 * check for end-of-section, comments, strip off trailing 1078 * spaces and newline character. 1079 */ 1080 for (p = cline; isspace(*p); ++p) 1081 continue; 1082 if (*p == '\0' || *p == '#') 1083 continue; 1084 for (p = strchr(cline, '\0'); isspace(*--p);) 1085 continue; 1086 *++p = '\0'; 1087 f = (struct filed *)calloc(1, sizeof(*f)); 1088 *nextp = f; 1089 nextp = &f->f_next; 1090 cfline(cline, f); 1091 } 1092 1093 /* close the configuration file */ 1094 (void)fclose(cf); 1095 1096 Initialized = 1; 1097 1098 if (Debug) { 1099 for (f = Files; f; f = f->f_next) { 1100 for (i = 0; i <= LOG_NFACILITIES; i++) 1101 if (f->f_pmask[i] == INTERNAL_NOPRI) 1102 printf("X "); 1103 else 1104 printf("%d ", f->f_pmask[i]); 1105 printf("%s: ", TypeNames[f->f_type]); 1106 switch (f->f_type) { 1107 case F_FILE: 1108 case F_TTY: 1109 case F_CONSOLE: 1110 printf("%s", f->f_un.f_fname); 1111 break; 1112 1113 case F_FORW: 1114 printf("%s", f->f_un.f_forw.f_hname); 1115 break; 1116 1117 case F_USERS: 1118 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1119 printf("%s, ", f->f_un.f_uname[i]); 1120 break; 1121 } 1122 printf("\n"); 1123 } 1124 } 1125 1126 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1127 dprintf("syslogd: restarted\n"); 1128 } 1129 1130 /* 1131 * Crack a configuration file line 1132 */ 1133 void 1134 cfline(line, f) 1135 char *line; 1136 struct filed *f; 1137 { 1138 struct addrinfo hints, *res; 1139 int error, i, pri; 1140 char *bp, *p, *q; 1141 char buf[MAXLINE], ebuf[100]; 1142 1143 dprintf("cfline(%s)\n", line); 1144 1145 errno = 0; /* keep strerror() stuff out of logerror messages */ 1146 1147 /* clear out file entry */ 1148 memset(f, 0, sizeof(*f)); 1149 for (i = 0; i <= LOG_NFACILITIES; i++) 1150 f->f_pmask[i] = INTERNAL_NOPRI; 1151 1152 /* scan through the list of selectors */ 1153 for (p = line; *p && *p != '\t';) { 1154 1155 /* find the end of this facility name list */ 1156 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1157 continue; 1158 1159 /* collect priority name */ 1160 for (bp = buf; *q && !strchr("\t,;", *q); ) 1161 *bp++ = *q++; 1162 *bp = '\0'; 1163 1164 /* skip cruft */ 1165 while (strchr(", ;", *q)) 1166 q++; 1167 1168 /* decode priority name */ 1169 if (*buf == '*') 1170 pri = LOG_PRIMASK + 1; 1171 else { 1172 pri = decode(buf, prioritynames); 1173 if (pri < 0) { 1174 (void)snprintf(ebuf, sizeof ebuf, 1175 "unknown priority name \"%s\"", buf); 1176 logerror(ebuf); 1177 return; 1178 } 1179 } 1180 1181 /* scan facilities */ 1182 while (*p && !strchr("\t.;", *p)) { 1183 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1184 *bp++ = *p++; 1185 *bp = '\0'; 1186 if (*buf == '*') 1187 for (i = 0; i < LOG_NFACILITIES; i++) 1188 f->f_pmask[i] = pri; 1189 else { 1190 i = decode(buf, facilitynames); 1191 if (i < 0) { 1192 (void)snprintf(ebuf, sizeof ebuf, 1193 "unknown facility name \"%s\"", 1194 buf); 1195 logerror(ebuf); 1196 return; 1197 } 1198 f->f_pmask[i >> 3] = pri; 1199 } 1200 while (*p == ',' || *p == ' ') 1201 p++; 1202 } 1203 1204 p = q; 1205 } 1206 1207 /* skip to action part */ 1208 while (*p == '\t') 1209 p++; 1210 1211 switch (*p) 1212 { 1213 case '@': 1214 if (!InetInuse) 1215 break; 1216 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1217 memset(&hints, 0, sizeof(hints)); 1218 hints.ai_family = AF_UNSPEC; 1219 hints.ai_socktype = SOCK_DGRAM; 1220 hints.ai_protocol = 0; 1221 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, &res); 1222 if (error) { 1223 logerror(gai_strerror(error)); 1224 break; 1225 } 1226 f->f_un.f_forw.f_addr = res; 1227 f->f_type = F_FORW; 1228 break; 1229 1230 case '/': 1231 (void)strcpy(f->f_un.f_fname, p); 1232 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1233 f->f_type = F_UNUSED; 1234 logerror(p); 1235 break; 1236 } 1237 if (isatty(f->f_file)) 1238 f->f_type = F_TTY; 1239 else 1240 f->f_type = F_FILE; 1241 if (strcmp(p, ctty) == 0) 1242 f->f_type = F_CONSOLE; 1243 break; 1244 1245 case '*': 1246 f->f_type = F_WALL; 1247 break; 1248 1249 default: 1250 for (i = 0; i < MAXUNAMES && *p; i++) { 1251 for (q = p; *q && *q != ','; ) 1252 q++; 1253 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1254 if ((q - p) > UT_NAMESIZE) 1255 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1256 else 1257 f->f_un.f_uname[i][q - p] = '\0'; 1258 while (*q == ',' || *q == ' ') 1259 q++; 1260 p = q; 1261 } 1262 f->f_type = F_USERS; 1263 break; 1264 } 1265 } 1266 1267 1268 /* 1269 * Decode a symbolic name to a numeric value 1270 */ 1271 int 1272 decode(name, codetab) 1273 const char *name; 1274 CODE *codetab; 1275 { 1276 CODE *c; 1277 char *p, buf[40]; 1278 1279 if (isdigit(*name)) 1280 return (atoi(name)); 1281 1282 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1283 if (isupper(*name)) 1284 *p = tolower(*name); 1285 else 1286 *p = *name; 1287 } 1288 *p = '\0'; 1289 for (c = codetab; c->c_name; c++) 1290 if (!strcmp(buf, c->c_name)) 1291 return (c->c_val); 1292 1293 return (-1); 1294 } 1295 1296 /* 1297 * Retrieve the size of the kernel message buffer, via sysctl. 1298 */ 1299 int 1300 getmsgbufsize() 1301 { 1302 int msgbufsize, mib[2]; 1303 size_t size; 1304 1305 mib[0] = CTL_KERN; 1306 mib[1] = KERN_MSGBUFSIZE; 1307 size = sizeof msgbufsize; 1308 if (sysctl(mib, 2, &msgbufsize, &size, NULL, 0) == -1) { 1309 dprintf("couldn't get kern.msgbufsize\n"); 1310 return (0); 1311 } 1312 return (msgbufsize); 1313 } 1314 1315 int * 1316 socksetup(af) 1317 int af; 1318 { 1319 struct addrinfo hints, *res, *r; 1320 int error, maxs, *s, *socks; 1321 1322 memset(&hints, 0, sizeof(hints)); 1323 hints.ai_flags = AI_PASSIVE; 1324 hints.ai_family = af; 1325 hints.ai_socktype = SOCK_DGRAM; 1326 error = getaddrinfo(NULL, "syslog", &hints, &res); 1327 if (error) { 1328 logerror(gai_strerror(error)); 1329 errno = 0; 1330 die(0); 1331 } 1332 1333 /* Count max number of sockets we may open */ 1334 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 1335 socks = malloc ((maxs+1) * sizeof(int)); 1336 if (!socks) { 1337 logerror("couldn't allocate memory for sockets"); 1338 die(0); 1339 } 1340 1341 *socks = 0; /* num of sockets counter at start of array */ 1342 s = socks+1; 1343 for (r = res; r; r = r->ai_next) { 1344 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 1345 if (*s < 0) { 1346 logerror("socket"); 1347 continue; 1348 } 1349 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 1350 close (*s); 1351 logerror("bind"); 1352 continue; 1353 } 1354 1355 *socks = *socks + 1; 1356 s++; 1357 } 1358 1359 if (*socks == 0) { 1360 free (socks); 1361 if(Debug) 1362 return(NULL); 1363 else 1364 die(0); 1365 } 1366 if (res) 1367 freeaddrinfo(res); 1368 1369 return(socks); 1370 } 1371