1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 42 #endif /* not lint */ 43 44 /* 45 * syslogd -- log system messages 46 * 47 * This program implements a system log. It takes a series of lines. 48 * Each line may have a priority, signified as "<n>" as 49 * the first characters of the line. If this is 50 * not present, a default priority is used. 51 * 52 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 53 * cause it to reread its configuration file. 54 * 55 * Defined Constants: 56 * 57 * MAXLINE -- the maximimum line length that can be handled. 58 * DEFUPRI -- the default priority for user messages 59 * DEFSPRI -- the default priority for kernel messages 60 * 61 * Author: Eric Allman 62 * extensive changes by Ralph Campbell 63 * more extensive changes by Eric Allman (again) 64 * Extension to log by program name as well as facility and priority 65 * by Peter da Silva. 66 */ 67 68 #define MAXLINE 1024 /* maximum line length */ 69 #define MAXSVLINE 120 /* maximum saved line length */ 70 #define DEFUPRI (LOG_USER|LOG_NOTICE) 71 #define DEFSPRI (LOG_KERN|LOG_CRIT) 72 #define TIMERINTVL 30 /* interval for checking flush, mark */ 73 74 #include <sys/param.h> 75 #include <sys/ioctl.h> 76 #include <sys/stat.h> 77 #include <sys/wait.h> 78 #include <sys/socket.h> 79 #include <sys/msgbuf.h> 80 #include <sys/uio.h> 81 #include <sys/un.h> 82 #include <sys/time.h> 83 #include <sys/resource.h> 84 #include <sys/syslimits.h> 85 #include <paths.h> 86 87 #include <netinet/in.h> 88 #include <netdb.h> 89 #include <arpa/inet.h> 90 91 #include <ctype.h> 92 #include <errno.h> 93 #include <fcntl.h> 94 #include <setjmp.h> 95 #include <signal.h> 96 #include <stdio.h> 97 #include <stdlib.h> 98 #include <string.h> 99 #include <unistd.h> 100 #include <utmp.h> 101 #include "pathnames.h" 102 103 #define SYSLOG_NAMES 104 #include <sys/syslog.h> 105 106 char *LogName = _PATH_LOG; 107 char *ConfFile = _PATH_LOGCONF; 108 char *PidFile = _PATH_LOGPID; 109 char ctty[] = _PATH_CONSOLE; 110 111 #define FDMASK(fd) (1 << (fd)) 112 113 #define dprintf if (Debug) printf 114 115 #define MAXUNAMES 20 /* maximum number of user names */ 116 117 /* 118 * Flags to logmsg(). 119 */ 120 121 #define IGN_CONS 0x001 /* don't print on console */ 122 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 123 #define ADDDATE 0x004 /* add a date to the message */ 124 #define MARK 0x008 /* this message is a mark */ 125 126 /* 127 * This structure represents the files that will have log 128 * copies printed. 129 */ 130 131 struct filed { 132 struct filed *f_next; /* next in linked list */ 133 short f_type; /* entry type, see below */ 134 short f_file; /* file descriptor */ 135 time_t f_time; /* time this was last written */ 136 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 137 char *f_program; /* program this applies to */ 138 union { 139 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 140 struct { 141 char f_hname[MAXHOSTNAMELEN+1]; 142 struct sockaddr_in f_addr; 143 } f_forw; /* forwarding address */ 144 char f_fname[MAXPATHLEN]; 145 } f_un; 146 char f_prevline[MAXSVLINE]; /* last message logged */ 147 char f_lasttime[16]; /* time of last occurrence */ 148 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 149 int f_prevpri; /* pri of f_prevline */ 150 int f_prevlen; /* length of f_prevline */ 151 int f_prevcount; /* repetition cnt of prevline */ 152 int f_repeatcount; /* number of "repeated" msgs */ 153 }; 154 155 /* 156 * Intervals at which we flush out "message repeated" messages, 157 * in seconds after previous message is logged. After each flush, 158 * we move to the next interval until we reach the largest. 159 */ 160 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 161 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 162 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 163 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 164 (f)->f_repeatcount = MAXREPEAT; \ 165 } 166 167 /* values for f_type */ 168 #define F_UNUSED 0 /* unused entry */ 169 #define F_FILE 1 /* regular file */ 170 #define F_TTY 2 /* terminal */ 171 #define F_CONSOLE 3 /* console terminal */ 172 #define F_FORW 4 /* remote machine */ 173 #define F_USERS 5 /* list of users */ 174 #define F_WALL 6 /* everyone logged on */ 175 176 char *TypeNames[7] = { 177 "UNUSED", "FILE", "TTY", "CONSOLE", 178 "FORW", "USERS", "WALL" 179 }; 180 181 struct filed *Files; 182 struct filed consfile; 183 184 int Debug; /* debug flag */ 185 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 186 char *LocalDomain; /* our local domain name */ 187 int InetInuse = 0; /* non-zero if INET sockets are being used */ 188 int finet; /* Internet datagram socket */ 189 int LogPort; /* port number for INET connections */ 190 int Initialized = 0; /* set when we have initialized ourselves */ 191 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 192 int MarkSeq = 0; /* mark sequence number */ 193 194 void cfline __P((char *, struct filed *, char *)); 195 char *cvthname __P((struct sockaddr_in *)); 196 int decode __P((const char *, CODE *)); 197 void die __P((int)); 198 void domark __P((int)); 199 void fprintlog __P((struct filed *, int, char *)); 200 void init __P((int)); 201 void logerror __P((char *)); 202 void logmsg __P((int, char *, char *, int)); 203 void printline __P((char *, char *)); 204 void printsys __P((char *)); 205 void reapchild __P((int)); 206 char *ttymsg __P((struct iovec *, int, char *, int)); 207 void usage __P((void)); 208 void wallmsg __P((struct filed *, struct iovec *)); 209 210 int 211 main(argc, argv) 212 int argc; 213 char *argv[]; 214 { 215 int ch, funix, i, inetm, fklog, klogm, len; 216 struct sockaddr_un sunx, fromunix; 217 struct sockaddr_in sin, frominet; 218 FILE *fp; 219 char *p, line[MSG_BSIZE + 1]; 220 221 while ((ch = getopt(argc, argv, "df:m:p:")) != EOF) 222 switch(ch) { 223 case 'd': /* debug */ 224 Debug++; 225 break; 226 case 'f': /* configuration file */ 227 ConfFile = optarg; 228 break; 229 case 'm': /* mark interval */ 230 MarkInterval = atoi(optarg) * 60; 231 break; 232 case 'p': /* path */ 233 LogName = optarg; 234 break; 235 case '?': 236 default: 237 usage(); 238 } 239 if ((argc -= optind) != 0) 240 usage(); 241 242 if (!Debug) 243 (void)daemon(0, 0); 244 else 245 setlinebuf(stdout); 246 247 consfile.f_type = F_CONSOLE; 248 (void)strcpy(consfile.f_un.f_fname, ctty); 249 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 250 if ((p = strchr(LocalHostName, '.')) != NULL) { 251 *p++ = '\0'; 252 LocalDomain = p; 253 } else 254 LocalDomain = ""; 255 (void)signal(SIGTERM, die); 256 (void)signal(SIGINT, Debug ? die : SIG_IGN); 257 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 258 (void)signal(SIGCHLD, reapchild); 259 (void)signal(SIGALRM, domark); 260 (void)alarm(TIMERINTVL); 261 (void)unlink(LogName); 262 263 #ifndef SUN_LEN 264 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 265 #endif 266 memset(&sunx, 0, sizeof(sunx)); 267 sunx.sun_family = AF_UNIX; 268 (void)strncpy(sunx.sun_path, LogName, sizeof(sunx.sun_path)); 269 funix = socket(AF_UNIX, SOCK_DGRAM, 0); 270 if (funix < 0 || 271 bind(funix, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 272 chmod(LogName, 0666) < 0) { 273 (void) sprintf(line, "cannot create %s", LogName); 274 logerror(line); 275 dprintf("cannot create %s (%d)\n", LogName, errno); 276 die(0); 277 } 278 finet = socket(AF_INET, SOCK_DGRAM, 0); 279 inetm = 0; 280 if (finet >= 0) { 281 struct servent *sp; 282 283 sp = getservbyname("syslog", "udp"); 284 if (sp == NULL) { 285 errno = 0; 286 logerror("syslog/udp: unknown service"); 287 die(0); 288 } 289 memset(&sin, 0, sizeof(sin)); 290 sin.sin_family = AF_INET; 291 sin.sin_port = LogPort = sp->s_port; 292 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 293 logerror("bind"); 294 if (!Debug) 295 die(0); 296 } else { 297 inetm = FDMASK(finet); 298 InetInuse = 1; 299 } 300 } 301 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 302 klogm = FDMASK(fklog); 303 else { 304 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 305 klogm = 0; 306 } 307 308 /* tuck my process id away */ 309 fp = fopen(PidFile, "w"); 310 if (fp != NULL) { 311 fprintf(fp, "%d\n", getpid()); 312 (void) fclose(fp); 313 } 314 315 dprintf("off & running....\n"); 316 317 init(0); 318 (void)signal(SIGHUP, init); 319 320 for (;;) { 321 int nfds, readfds = FDMASK(funix) | inetm | klogm; 322 323 dprintf("readfds = %#x\n", readfds); 324 nfds = select(20, (fd_set *)&readfds, (fd_set *)NULL, 325 (fd_set *)NULL, (struct timeval *)NULL); 326 if (nfds == 0) 327 continue; 328 if (nfds < 0) { 329 if (errno != EINTR) 330 logerror("select"); 331 continue; 332 } 333 dprintf("got a message (%d, %#x)\n", nfds, readfds); 334 if (readfds & klogm) { 335 i = read(fklog, line, sizeof(line) - 1); 336 if (i > 0) { 337 line[i] = '\0'; 338 printsys(line); 339 } else if (i < 0 && errno != EINTR) { 340 logerror("klog"); 341 fklog = -1; 342 klogm = 0; 343 } 344 } 345 if (readfds & FDMASK(funix)) { 346 len = sizeof(fromunix); 347 i = recvfrom(funix, line, MAXLINE, 0, 348 (struct sockaddr *)&fromunix, &len); 349 if (i > 0) { 350 line[i] = '\0'; 351 printline(LocalHostName, line); 352 } else if (i < 0 && errno != EINTR) 353 logerror("recvfrom unix"); 354 } 355 if (readfds & inetm) { 356 len = sizeof(frominet); 357 i = recvfrom(finet, line, MAXLINE, 0, 358 (struct sockaddr *)&frominet, &len); 359 if (i > 0) { 360 line[i] = '\0'; 361 printline(cvthname(&frominet), line); 362 } else if (i < 0 && errno != EINTR) 363 logerror("recvfrom inet"); 364 } 365 } 366 } 367 368 void 369 usage() 370 { 371 372 (void)fprintf(stderr, 373 "usage: syslogd [-f conffile] [-m markinterval] [-p logpath]\n"); 374 exit(1); 375 } 376 377 /* 378 * Take a raw input line, decode the message, and print the message 379 * on the appropriate log files. 380 */ 381 void 382 printline(hname, msg) 383 char *hname; 384 char *msg; 385 { 386 int c, pri; 387 char *p, *q, line[MAXLINE + 1]; 388 389 /* test for special codes */ 390 pri = DEFUPRI; 391 p = msg; 392 if (*p == '<') { 393 pri = 0; 394 while (isdigit(*++p)) 395 pri = 10 * pri + (*p - '0'); 396 if (*p == '>') 397 ++p; 398 } 399 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 400 pri = DEFUPRI; 401 402 /* don't allow users to log kernel messages */ 403 if (LOG_FAC(pri) == LOG_KERN) 404 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 405 406 q = line; 407 408 while ((c = *p++ & 0177) != '\0' && 409 q < &line[sizeof(line) - 1]) 410 if (iscntrl(c)) 411 if (c == '\n') 412 *q++ = ' '; 413 else if (c == '\t') 414 *q++ = '\t'; 415 else { 416 *q++ = '^'; 417 *q++ = c ^ 0100; 418 } 419 else 420 *q++ = c; 421 *q = '\0'; 422 423 logmsg(pri, line, hname, 0); 424 } 425 426 /* 427 * Take a raw input line from /dev/klog, split and format similar to syslog(). 428 */ 429 void 430 printsys(msg) 431 char *msg; 432 { 433 int c, pri, flags; 434 char *lp, *p, *q, line[MAXLINE + 1]; 435 436 (void)strcpy(line, getbootfile()); 437 (void)strcat(line, ": "); 438 lp = line + strlen(line); 439 for (p = msg; *p != '\0'; ) { 440 flags = SYNC_FILE | ADDDATE; /* fsync file after write */ 441 pri = DEFSPRI; 442 if (*p == '<') { 443 pri = 0; 444 while (isdigit(*++p)) 445 pri = 10 * pri + (*p - '0'); 446 if (*p == '>') 447 ++p; 448 } else { 449 /* kernel printf's come out on console */ 450 flags |= IGN_CONS; 451 } 452 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 453 pri = DEFSPRI; 454 q = lp; 455 while (*p != '\0' && (c = *p++) != '\n' && 456 q < &line[MAXLINE]) 457 *q++ = c; 458 *q = '\0'; 459 logmsg(pri, line, LocalHostName, flags); 460 } 461 } 462 463 time_t now; 464 465 /* 466 * Log a message to the appropriate log files, users, etc. based on 467 * the priority. 468 */ 469 void 470 logmsg(pri, msg, from, flags) 471 int pri; 472 char *msg, *from; 473 int flags; 474 { 475 struct filed *f; 476 int fac, msglen, omask, prilev; 477 char *timestamp; 478 char prog[NAME_MAX+1]; 479 int i; 480 481 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 482 pri, flags, from, msg); 483 484 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 485 486 /* 487 * Check to see if msg looks non-standard. 488 */ 489 msglen = strlen(msg); 490 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 491 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 492 flags |= ADDDATE; 493 494 (void)time(&now); 495 if (flags & ADDDATE) 496 timestamp = ctime(&now) + 4; 497 else { 498 timestamp = msg; 499 msg += 16; 500 msglen -= 16; 501 } 502 503 /* skip leading blanks */ 504 while(isspace(*msg)) { 505 msg++; 506 msglen--; 507 } 508 509 /* extract facility and priority level */ 510 if (flags & MARK) 511 fac = LOG_NFACILITIES; 512 else 513 fac = LOG_FAC(pri); 514 prilev = LOG_PRI(pri); 515 516 /* extract program name */ 517 for(i = 0; i < NAME_MAX; i++) { 518 if(!isalnum(msg[i])) 519 break; 520 prog[i] = msg[i]; 521 } 522 prog[i] = 0; 523 524 /* log the message to the particular outputs */ 525 if (!Initialized) { 526 f = &consfile; 527 f->f_file = open(ctty, O_WRONLY, 0); 528 529 if (f->f_file >= 0) { 530 fprintlog(f, flags, msg); 531 (void)close(f->f_file); 532 } 533 (void)sigsetmask(omask); 534 return; 535 } 536 for (f = Files; f; f = f->f_next) { 537 /* skip messages that are incorrect priority */ 538 if (f->f_pmask[fac] < prilev || 539 f->f_pmask[fac] == INTERNAL_NOPRI) 540 continue; 541 /* skip messages with the incorrect program name */ 542 if(f->f_program) 543 if(strcmp(prog, f->f_program) != 0) 544 continue; 545 546 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 547 continue; 548 549 /* don't output marks to recently written files */ 550 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 551 continue; 552 553 /* 554 * suppress duplicate lines to this file 555 */ 556 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 557 !strcmp(msg, f->f_prevline) && 558 !strcmp(from, f->f_prevhost)) { 559 (void)strncpy(f->f_lasttime, timestamp, 15); 560 f->f_prevcount++; 561 dprintf("msg repeated %d times, %ld sec of %d\n", 562 f->f_prevcount, now - f->f_time, 563 repeatinterval[f->f_repeatcount]); 564 /* 565 * If domark would have logged this by now, 566 * flush it now (so we don't hold isolated messages), 567 * but back off so we'll flush less often 568 * in the future. 569 */ 570 if (now > REPEATTIME(f)) { 571 fprintlog(f, flags, (char *)NULL); 572 BACKOFF(f); 573 } 574 } else { 575 /* new line, save it */ 576 if (f->f_prevcount) 577 fprintlog(f, 0, (char *)NULL); 578 f->f_repeatcount = 0; 579 (void)strncpy(f->f_lasttime, timestamp, 15); 580 (void)strncpy(f->f_prevhost, from, 581 sizeof(f->f_prevhost)); 582 if (msglen < MAXSVLINE) { 583 f->f_prevlen = msglen; 584 f->f_prevpri = pri; 585 (void)strcpy(f->f_prevline, msg); 586 fprintlog(f, flags, (char *)NULL); 587 } else { 588 f->f_prevline[0] = 0; 589 f->f_prevlen = 0; 590 fprintlog(f, flags, msg); 591 } 592 } 593 } 594 (void)sigsetmask(omask); 595 } 596 597 void 598 fprintlog(f, flags, msg) 599 struct filed *f; 600 int flags; 601 char *msg; 602 { 603 struct iovec iov[6]; 604 struct iovec *v; 605 int l; 606 char line[MAXLINE + 1], repbuf[80], greetings[200]; 607 608 v = iov; 609 if (f->f_type == F_WALL) { 610 v->iov_base = greetings; 611 v->iov_len = sprintf(greetings, 612 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 613 f->f_prevhost, ctime(&now)); 614 v++; 615 v->iov_base = ""; 616 v->iov_len = 0; 617 v++; 618 } else { 619 v->iov_base = f->f_lasttime; 620 v->iov_len = 15; 621 v++; 622 v->iov_base = " "; 623 v->iov_len = 1; 624 v++; 625 } 626 v->iov_base = f->f_prevhost; 627 v->iov_len = strlen(v->iov_base); 628 v++; 629 v->iov_base = " "; 630 v->iov_len = 1; 631 v++; 632 633 if (msg) { 634 v->iov_base = msg; 635 v->iov_len = strlen(msg); 636 } else if (f->f_prevcount > 1) { 637 v->iov_base = repbuf; 638 v->iov_len = sprintf(repbuf, "last message repeated %d times", 639 f->f_prevcount); 640 } else { 641 v->iov_base = f->f_prevline; 642 v->iov_len = f->f_prevlen; 643 } 644 v++; 645 646 dprintf("Logging to %s", TypeNames[f->f_type]); 647 f->f_time = now; 648 649 switch (f->f_type) { 650 case F_UNUSED: 651 dprintf("\n"); 652 break; 653 654 case F_FORW: 655 dprintf(" %s\n", f->f_un.f_forw.f_hname); 656 l = sprintf(line, "<%d>%.15s %s", f->f_prevpri, 657 iov[0].iov_base, iov[4].iov_base); 658 if (l > MAXLINE) 659 l = MAXLINE; 660 if (sendto(finet, line, l, 0, 661 (struct sockaddr *)&f->f_un.f_forw.f_addr, 662 sizeof(f->f_un.f_forw.f_addr)) != l) { 663 int e = errno; 664 (void)close(f->f_file); 665 f->f_type = F_UNUSED; 666 errno = e; 667 logerror("sendto"); 668 } 669 break; 670 671 case F_CONSOLE: 672 if (flags & IGN_CONS) { 673 dprintf(" (ignored)\n"); 674 break; 675 } 676 /* FALLTHROUGH */ 677 678 case F_TTY: 679 case F_FILE: 680 dprintf(" %s\n", f->f_un.f_fname); 681 if (f->f_type != F_FILE) { 682 v->iov_base = "\r\n"; 683 v->iov_len = 2; 684 } else { 685 v->iov_base = "\n"; 686 v->iov_len = 1; 687 } 688 again: 689 if (writev(f->f_file, iov, 6) < 0) { 690 int e = errno; 691 (void)close(f->f_file); 692 /* 693 * Check for errors on TTY's due to loss of tty 694 */ 695 if ((e == EIO || e == EBADF) && f->f_type != F_FILE) { 696 f->f_file = open(f->f_un.f_fname, 697 O_WRONLY|O_APPEND, 0); 698 if (f->f_file < 0) { 699 f->f_type = F_UNUSED; 700 logerror(f->f_un.f_fname); 701 } else 702 goto again; 703 } else { 704 f->f_type = F_UNUSED; 705 errno = e; 706 logerror(f->f_un.f_fname); 707 } 708 } else if (flags & SYNC_FILE) 709 (void)fsync(f->f_file); 710 break; 711 712 case F_USERS: 713 case F_WALL: 714 dprintf("\n"); 715 v->iov_base = "\r\n"; 716 v->iov_len = 2; 717 wallmsg(f, iov); 718 break; 719 } 720 f->f_prevcount = 0; 721 } 722 723 /* 724 * WALLMSG -- Write a message to the world at large 725 * 726 * Write the specified message to either the entire 727 * world, or a list of approved users. 728 */ 729 void 730 wallmsg(f, iov) 731 struct filed *f; 732 struct iovec *iov; 733 { 734 static int reenter; /* avoid calling ourselves */ 735 FILE *uf; 736 struct utmp ut; 737 int i; 738 char *p; 739 char line[sizeof(ut.ut_line) + 1]; 740 741 if (reenter++) 742 return; 743 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 744 logerror(_PATH_UTMP); 745 reenter = 0; 746 return; 747 } 748 /* NOSTRICT */ 749 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 750 if (ut.ut_name[0] == '\0') 751 continue; 752 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 753 line[sizeof(ut.ut_line)] = '\0'; 754 if (f->f_type == F_WALL) { 755 if ((p = ttymsg(iov, 6, line, 60*5)) != NULL) { 756 errno = 0; /* already in msg */ 757 logerror(p); 758 } 759 continue; 760 } 761 /* should we send the message to this user? */ 762 for (i = 0; i < MAXUNAMES; i++) { 763 if (!f->f_un.f_uname[i][0]) 764 break; 765 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 766 UT_NAMESIZE)) { 767 if ((p = ttymsg(iov, 6, line, 60*5)) != NULL) { 768 errno = 0; /* already in msg */ 769 logerror(p); 770 } 771 break; 772 } 773 } 774 } 775 (void)fclose(uf); 776 reenter = 0; 777 } 778 779 void 780 reapchild(signo) 781 int signo; 782 { 783 union wait status; 784 785 while (wait3((int *)&status, WNOHANG, (struct rusage *)NULL) > 0) 786 ; 787 } 788 789 /* 790 * Return a printable representation of a host address. 791 */ 792 char * 793 cvthname(f) 794 struct sockaddr_in *f; 795 { 796 struct hostent *hp; 797 char *p; 798 799 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 800 801 if (f->sin_family != AF_INET) { 802 dprintf("Malformed from address\n"); 803 return ("???"); 804 } 805 hp = gethostbyaddr((char *)&f->sin_addr, 806 sizeof(struct in_addr), f->sin_family); 807 if (hp == 0) { 808 dprintf("Host name for your address (%s) unknown\n", 809 inet_ntoa(f->sin_addr)); 810 return (inet_ntoa(f->sin_addr)); 811 } 812 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 813 *p = '\0'; 814 return (hp->h_name); 815 } 816 817 void 818 domark(signo) 819 int signo; 820 { 821 struct filed *f; 822 823 now = time((time_t *)NULL); 824 MarkSeq += TIMERINTVL; 825 if (MarkSeq >= MarkInterval) { 826 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 827 MarkSeq = 0; 828 } 829 830 for (f = Files; f; f = f->f_next) { 831 if (f->f_prevcount && now >= REPEATTIME(f)) { 832 dprintf("flush %s: repeated %d times, %d sec.\n", 833 TypeNames[f->f_type], f->f_prevcount, 834 repeatinterval[f->f_repeatcount]); 835 fprintlog(f, 0, (char *)NULL); 836 BACKOFF(f); 837 } 838 } 839 (void)alarm(TIMERINTVL); 840 } 841 842 /* 843 * Print syslogd errors some place. 844 */ 845 void 846 logerror(type) 847 char *type; 848 { 849 char buf[100]; 850 851 if (errno) 852 (void)snprintf(buf, 853 sizeof(buf), "syslogd: %s: %s", type, strerror(errno)); 854 else 855 (void)snprintf(buf, sizeof(buf), "syslogd: %s", type); 856 errno = 0; 857 dprintf("%s\n", buf); 858 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 859 } 860 861 void 862 die(signo) 863 int signo; 864 { 865 struct filed *f; 866 char buf[100]; 867 868 for (f = Files; f != NULL; f = f->f_next) { 869 /* flush any pending output */ 870 if (f->f_prevcount) 871 fprintlog(f, 0, (char *)NULL); 872 } 873 if (signo) { 874 dprintf("syslogd: exiting on signal %d\n", signo); 875 (void)sprintf(buf, "exiting on signal %d", signo); 876 errno = 0; 877 logerror(buf); 878 } 879 (void)unlink(LogName); 880 exit(0); 881 } 882 883 /* 884 * INIT -- Initialize syslogd from configuration table 885 */ 886 void 887 init(signo) 888 int signo; 889 { 890 int i; 891 FILE *cf; 892 struct filed *f, *next, **nextp; 893 char *p; 894 char cline[LINE_MAX]; 895 char prog[NAME_MAX+1]; 896 897 dprintf("init\n"); 898 899 /* 900 * Close all open log files. 901 */ 902 Initialized = 0; 903 for (f = Files; f != NULL; f = next) { 904 /* flush any pending output */ 905 if (f->f_prevcount) 906 fprintlog(f, 0, (char *)NULL); 907 908 switch (f->f_type) { 909 case F_FILE: 910 case F_TTY: 911 case F_CONSOLE: 912 case F_FORW: 913 (void)close(f->f_file); 914 break; 915 } 916 next = f->f_next; 917 if(f->f_program) free(f->f_program); 918 free((char *)f); 919 } 920 Files = NULL; 921 nextp = &Files; 922 923 /* open the configuration file */ 924 if ((cf = fopen(ConfFile, "r")) == NULL) { 925 dprintf("cannot open %s\n", ConfFile); 926 *nextp = (struct filed *)calloc(1, sizeof(*f)); 927 cfline("*.ERR\t/dev/console", *nextp, "*"); 928 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 929 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 930 Initialized = 1; 931 return; 932 } 933 934 /* 935 * Foreach line in the conf table, open that file. 936 */ 937 f = NULL; 938 strcpy(prog, "*"); 939 while (fgets(cline, sizeof(cline), cf) != NULL) { 940 /* 941 * check for end-of-section, comments, strip off trailing 942 * spaces and newline character. #!prog is treated specially: 943 * following lines apply only to that program. 944 */ 945 for (p = cline; isspace(*p); ++p) 946 continue; 947 if (*p == 0) 948 continue; 949 if(*p == '#') { 950 p++; 951 if(*p!='!') 952 continue; 953 } 954 if(*p=='!') { 955 p++; 956 while(isspace(*p)) p++; 957 if(!*p) { 958 strcpy(prog, "*"); 959 continue; 960 } 961 for(i = 0; i < NAME_MAX; i++) { 962 if(!isalnum(p[i])) 963 break; 964 prog[i] = p[i]; 965 } 966 prog[i] = 0; 967 continue; 968 } 969 for (p = strchr(cline, '\0'); isspace(*--p);) 970 continue; 971 *++p = '\0'; 972 f = (struct filed *)calloc(1, sizeof(*f)); 973 *nextp = f; 974 nextp = &f->f_next; 975 cfline(cline, f, prog); 976 } 977 978 /* close the configuration file */ 979 (void)fclose(cf); 980 981 Initialized = 1; 982 983 if (Debug) { 984 for (f = Files; f; f = f->f_next) { 985 for (i = 0; i <= LOG_NFACILITIES; i++) 986 if (f->f_pmask[i] == INTERNAL_NOPRI) 987 printf("X "); 988 else 989 printf("%d ", f->f_pmask[i]); 990 printf("%s: ", TypeNames[f->f_type]); 991 switch (f->f_type) { 992 case F_FILE: 993 case F_TTY: 994 case F_CONSOLE: 995 printf("%s", f->f_un.f_fname); 996 break; 997 998 case F_FORW: 999 printf("%s", f->f_un.f_forw.f_hname); 1000 break; 1001 1002 case F_USERS: 1003 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1004 printf("%s, ", f->f_un.f_uname[i]); 1005 break; 1006 } 1007 if(f->f_program) { 1008 printf(" (%s)", f->f_program); 1009 } 1010 printf("\n"); 1011 } 1012 } 1013 1014 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1015 dprintf("syslogd: restarted\n"); 1016 } 1017 1018 /* 1019 * Crack a configuration file line 1020 */ 1021 void 1022 cfline(line, f, prog) 1023 char *line; 1024 struct filed *f; 1025 char *prog; 1026 { 1027 struct hostent *hp; 1028 int i, pri; 1029 char *bp, *p, *q; 1030 char buf[MAXLINE], ebuf[100]; 1031 1032 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1033 1034 errno = 0; /* keep strerror() stuff out of logerror messages */ 1035 1036 /* clear out file entry */ 1037 memset(f, 0, sizeof(*f)); 1038 for (i = 0; i <= LOG_NFACILITIES; i++) 1039 f->f_pmask[i] = INTERNAL_NOPRI; 1040 1041 /* save program name if any */ 1042 if(prog && *prog=='*') prog = NULL; 1043 if(prog) { 1044 f->f_program = calloc(1, strlen(prog)+1); 1045 if(f->f_program) { 1046 strcpy(f->f_program, prog); 1047 } 1048 } 1049 1050 /* scan through the list of selectors */ 1051 for (p = line; *p && *p != '\t';) { 1052 1053 /* find the end of this facility name list */ 1054 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1055 continue; 1056 1057 /* collect priority name */ 1058 for (bp = buf; *q && !strchr("\t,;", *q); ) 1059 *bp++ = *q++; 1060 *bp = '\0'; 1061 1062 /* skip cruft */ 1063 while (strchr(", ;", *q)) 1064 q++; 1065 1066 /* decode priority name */ 1067 if (*buf == '*') 1068 pri = LOG_PRIMASK + 1; 1069 else { 1070 pri = decode(buf, prioritynames); 1071 if (pri < 0) { 1072 (void)sprintf(ebuf, 1073 "unknown priority name \"%s\"", buf); 1074 logerror(ebuf); 1075 return; 1076 } 1077 } 1078 1079 /* scan facilities */ 1080 while (*p && !strchr("\t.;", *p)) { 1081 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1082 *bp++ = *p++; 1083 *bp = '\0'; 1084 if (*buf == '*') 1085 for (i = 0; i < LOG_NFACILITIES; i++) 1086 f->f_pmask[i] = pri; 1087 else { 1088 i = decode(buf, facilitynames); 1089 if (i < 0) { 1090 (void)sprintf(ebuf, 1091 "unknown facility name \"%s\"", 1092 buf); 1093 logerror(ebuf); 1094 return; 1095 } 1096 f->f_pmask[i >> 3] = pri; 1097 } 1098 while (*p == ',' || *p == ' ') 1099 p++; 1100 } 1101 1102 p = q; 1103 } 1104 1105 /* skip to action part */ 1106 while (*p == '\t') 1107 p++; 1108 1109 switch (*p) 1110 { 1111 case '@': 1112 if (!InetInuse) 1113 break; 1114 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1115 hp = gethostbyname(p); 1116 if (hp == NULL) { 1117 extern int h_errno; 1118 1119 logerror(hstrerror(h_errno)); 1120 break; 1121 } 1122 memset(&f->f_un.f_forw.f_addr, 0, 1123 sizeof(f->f_un.f_forw.f_addr)); 1124 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1125 f->f_un.f_forw.f_addr.sin_port = LogPort; 1126 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1127 f->f_type = F_FORW; 1128 break; 1129 1130 case '/': 1131 (void)strcpy(f->f_un.f_fname, p); 1132 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1133 f->f_file = F_UNUSED; 1134 logerror(p); 1135 break; 1136 } 1137 if (isatty(f->f_file)) 1138 f->f_type = F_TTY; 1139 else 1140 f->f_type = F_FILE; 1141 if (strcmp(p, ctty) == 0) 1142 f->f_type = F_CONSOLE; 1143 break; 1144 1145 case '*': 1146 f->f_type = F_WALL; 1147 break; 1148 1149 default: 1150 for (i = 0; i < MAXUNAMES && *p; i++) { 1151 for (q = p; *q && *q != ','; ) 1152 q++; 1153 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1154 if ((q - p) > UT_NAMESIZE) 1155 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1156 else 1157 f->f_un.f_uname[i][q - p] = '\0'; 1158 while (*q == ',' || *q == ' ') 1159 q++; 1160 p = q; 1161 } 1162 f->f_type = F_USERS; 1163 break; 1164 } 1165 } 1166 1167 1168 /* 1169 * Decode a symbolic name to a numeric value 1170 */ 1171 int 1172 decode(name, codetab) 1173 const char *name; 1174 CODE *codetab; 1175 { 1176 CODE *c; 1177 char *p, buf[40]; 1178 1179 if (isdigit(*name)) 1180 return (atoi(name)); 1181 1182 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1183 if (isupper(*name)) 1184 *p = tolower(*name); 1185 else 1186 *p = *name; 1187 } 1188 *p = '\0'; 1189 for (c = codetab; c->c_name; c++) 1190 if (!strcmp(buf, c->c_name)) 1191 return (c->c_val); 1192 1193 return (-1); 1194 } 1195