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 const 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 #if 0 42 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 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 * Extension to log by program name as well as facility and priority 69 * by Peter da Silva. 70 * -u and -v by Harlan Stenn. 71 * Priority comparison code by Harlan Stenn. 72 */ 73 74 #define MAXLINE 1024 /* maximum line length */ 75 #define MAXSVLINE 120 /* maximum saved line length */ 76 #define DEFUPRI (LOG_USER|LOG_NOTICE) 77 #define DEFSPRI (LOG_KERN|LOG_CRIT) 78 #define TIMERINTVL 30 /* interval for checking flush, mark */ 79 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/stat.h> 84 #include <sys/wait.h> 85 #include <sys/socket.h> 86 #include <sys/queue.h> 87 #include <sys/uio.h> 88 #include <sys/un.h> 89 #include <sys/time.h> 90 #include <sys/resource.h> 91 #include <sys/syslimits.h> 92 #include <paths.h> 93 94 #include <netinet/in.h> 95 #include <netdb.h> 96 #include <arpa/inet.h> 97 98 #include <ctype.h> 99 #include <err.h> 100 #include <errno.h> 101 #include <fcntl.h> 102 #include <regex.h> 103 #include <setjmp.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmp.h> 111 #include "pathnames.h" 112 113 #define SYSLOG_NAMES 114 #include <sys/syslog.h> 115 116 const char *ConfFile = _PATH_LOGCONF; 117 const char *PidFile = _PATH_LOGPID; 118 const char ctty[] = _PATH_CONSOLE; 119 120 #define dprintf if (Debug) printf 121 122 #define MAXUNAMES 20 /* maximum number of user names */ 123 124 #define MAXFUNIX 20 125 126 int nfunix = 1; 127 char *funixn[MAXFUNIX] = { _PATH_LOG }; 128 int funix[MAXFUNIX]; 129 130 /* 131 * Flags to logmsg(). 132 */ 133 134 #define IGN_CONS 0x001 /* don't print on console */ 135 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 136 #define ADDDATE 0x004 /* add a date to the message */ 137 #define MARK 0x008 /* this message is a mark */ 138 #define ISKERNEL 0x010 /* kernel generated message */ 139 140 /* 141 * This structure represents the files that will have log 142 * copies printed. 143 */ 144 145 struct filed { 146 struct filed *f_next; /* next in linked list */ 147 short f_type; /* entry type, see below */ 148 short f_file; /* file descriptor */ 149 time_t f_time; /* time this was last written */ 150 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 151 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 152 #define PRI_LT 0x1 153 #define PRI_EQ 0x2 154 #define PRI_GT 0x4 155 char *f_program; /* program this applies to */ 156 union { 157 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 158 struct { 159 char f_hname[MAXHOSTNAMELEN+1]; 160 struct sockaddr_in f_addr; 161 } f_forw; /* forwarding address */ 162 char f_fname[MAXPATHLEN]; 163 struct { 164 char f_pname[MAXPATHLEN]; 165 pid_t f_pid; 166 } f_pipe; 167 } f_un; 168 char f_prevline[MAXSVLINE]; /* last message logged */ 169 char f_lasttime[16]; /* time of last occurrence */ 170 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 171 int f_prevpri; /* pri of f_prevline */ 172 int f_prevlen; /* length of f_prevline */ 173 int f_prevcount; /* repetition cnt of prevline */ 174 int f_repeatcount; /* number of "repeated" msgs */ 175 }; 176 177 /* 178 * Queue of about-to-be dead processes we should watch out for. 179 */ 180 181 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 182 struct stailhead *deadq_headp; 183 184 struct deadq_entry { 185 pid_t dq_pid; 186 int dq_timeout; 187 TAILQ_ENTRY(deadq_entry) dq_entries; 188 }; 189 190 /* 191 * The timeout to apply to processes waiting on the dead queue. Unit 192 * of measure is `mark intervals', i.e. 20 minutes by default. 193 * Processes on the dead queue will be terminated after that time. 194 */ 195 196 #define DQ_TIMO_INIT 2 197 198 typedef struct deadq_entry *dq_t; 199 200 201 /* 202 * Struct to hold records of network addresses that are allowed to log 203 * to us. 204 */ 205 struct allowedpeer { 206 int isnumeric; 207 u_short port; 208 union { 209 struct { 210 struct in_addr addr; 211 struct in_addr mask; 212 } numeric; 213 char *name; 214 } u; 215 #define a_addr u.numeric.addr 216 #define a_mask u.numeric.mask 217 #define a_name u.name 218 }; 219 220 221 /* 222 * Intervals at which we flush out "message repeated" messages, 223 * in seconds after previous message is logged. After each flush, 224 * we move to the next interval until we reach the largest. 225 */ 226 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 227 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 228 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 229 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 230 (f)->f_repeatcount = MAXREPEAT; \ 231 } 232 233 /* values for f_type */ 234 #define F_UNUSED 0 /* unused entry */ 235 #define F_FILE 1 /* regular file */ 236 #define F_TTY 2 /* terminal */ 237 #define F_CONSOLE 3 /* console terminal */ 238 #define F_FORW 4 /* remote machine */ 239 #define F_USERS 5 /* list of users */ 240 #define F_WALL 6 /* everyone logged on */ 241 #define F_PIPE 7 /* pipe to program */ 242 243 char *TypeNames[8] = { 244 "UNUSED", "FILE", "TTY", "CONSOLE", 245 "FORW", "USERS", "WALL", "PIPE" 246 }; 247 248 struct filed *Files; 249 struct filed consfile; 250 251 int Debug; /* debug flag */ 252 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 253 char *LocalDomain; /* our local domain name */ 254 int finet = -1; /* Internet datagram socket */ 255 int fklog = -1; /* /dev/klog */ 256 int LogPort; /* port number for INET connections */ 257 int Initialized = 0; /* set when we have initialized ourselves */ 258 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 259 int MarkSeq = 0; /* mark sequence number */ 260 int SecureMode = 0; /* when true, receive only unix domain socks */ 261 262 char bootfile[MAXLINE+1]; /* booted kernel file */ 263 264 struct allowedpeer *AllowedPeers; 265 int NumAllowed = 0; /* # of AllowedPeer entries */ 266 267 int UniquePriority = 0; /* Only log specified priority? */ 268 int LogFacPri = 0; /* Put facility and priority in log message: */ 269 /* 0=no, 1=numeric, 2=names */ 270 271 int allowaddr __P((char *)); 272 void cfline __P((char *, struct filed *, char *)); 273 char *cvthname __P((struct sockaddr_in *)); 274 void deadq_enter __P((pid_t, const char *)); 275 int deadq_remove __P((pid_t)); 276 int decode __P((const char *, CODE *)); 277 void die __P((int)); 278 void domark __P((int)); 279 void fprintlog __P((struct filed *, int, char *)); 280 void init __P((int)); 281 void logerror __P((const char *)); 282 void logmsg __P((int, char *, char *, int)); 283 void log_deadchild __P((pid_t, int, const char *)); 284 void printline __P((char *, char *)); 285 void printsys __P((char *)); 286 int p_open __P((char *, pid_t *)); 287 void readklog __P((void)); 288 void reapchild __P((int)); 289 char *ttymsg __P((struct iovec *, int, char *, int)); 290 static void usage __P((void)); 291 int validate __P((struct sockaddr_in *, const char *)); 292 void wallmsg __P((struct filed *, struct iovec *)); 293 int waitdaemon __P((int, int, int)); 294 void timedout __P((int)); 295 296 int 297 main(argc, argv) 298 int argc; 299 char *argv[]; 300 { 301 int ch, i, l; 302 struct sockaddr_un sunx, fromunix; 303 struct sockaddr_in sin, frominet; 304 FILE *fp; 305 char *p, *hname, line[MAXLINE + 1]; 306 struct timeval tv, *tvp; 307 struct sigaction sact; 308 sigset_t mask; 309 pid_t ppid = 1; 310 socklen_t len; 311 312 while ((ch = getopt(argc, argv, "a:dl:f:m:p:suv")) != -1) 313 switch(ch) { 314 case 'd': /* debug */ 315 Debug++; 316 break; 317 case 'a': /* allow specific network addresses only */ 318 if (allowaddr(optarg) == -1) 319 usage(); 320 break; 321 case 'f': /* configuration file */ 322 ConfFile = optarg; 323 break; 324 case 'm': /* mark interval */ 325 MarkInterval = atoi(optarg) * 60; 326 break; 327 case 'p': /* path */ 328 funixn[0] = optarg; 329 break; 330 case 's': /* no network mode */ 331 SecureMode++; 332 break; 333 case 'l': 334 if (nfunix < MAXFUNIX) 335 funixn[nfunix++] = optarg; 336 else 337 warnx("out of descriptors, ignoring %s", 338 optarg); 339 break; 340 case 'u': /* only log specified priority */ 341 UniquePriority++; 342 break; 343 case 'v': /* log facility and priority */ 344 LogFacPri++; 345 break; 346 case '?': 347 default: 348 usage(); 349 } 350 if ((argc -= optind) != 0) 351 usage(); 352 353 if (!Debug) { 354 ppid = waitdaemon(0, 0, 30); 355 if (ppid < 0) 356 err(1, "could not become daemon"); 357 } else 358 setlinebuf(stdout); 359 360 if (NumAllowed) 361 endservent(); 362 363 consfile.f_type = F_CONSOLE; 364 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 365 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 366 if ((p = strchr(LocalHostName, '.')) != NULL) { 367 *p++ = '\0'; 368 LocalDomain = p; 369 } else 370 LocalDomain = ""; 371 (void)strcpy(bootfile, getbootfile()); 372 (void)signal(SIGTERM, die); 373 (void)signal(SIGINT, Debug ? die : SIG_IGN); 374 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 375 /* 376 * We don't want the SIGCHLD and SIGHUP handlers to interfere 377 * with each other; they are likely candidates for being called 378 * simultaneously (SIGHUP closes pipe descriptor, process dies, 379 * SIGCHLD happens). 380 */ 381 sigemptyset(&mask); 382 sigaddset(&mask, SIGHUP); 383 sact.sa_handler = reapchild; 384 sact.sa_mask = mask; 385 sact.sa_flags = 0; 386 (void)sigaction(SIGCHLD, &sact, NULL); 387 (void)signal(SIGALRM, domark); 388 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 389 (void)alarm(TIMERINTVL); 390 391 TAILQ_INIT(&deadq_head); 392 393 #ifndef SUN_LEN 394 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 395 #endif 396 for (i = 0; i < nfunix; i++) { 397 memset(&sunx, 0, sizeof(sunx)); 398 sunx.sun_family = AF_UNIX; 399 (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 400 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 401 if (funix[i] < 0 || 402 bind(funix[i], (struct sockaddr *)&sunx, 403 SUN_LEN(&sunx)) < 0 || 404 chmod(funixn[i], 0666) < 0) { 405 (void) snprintf(line, sizeof line, 406 "cannot create %s", funixn[i]); 407 logerror(line); 408 dprintf("cannot create %s (%d)\n", funixn[i], errno); 409 if (i == 0) 410 die(0); 411 } 412 } 413 if (SecureMode <= 1) 414 finet = socket(AF_INET, SOCK_DGRAM, 0); 415 if (finet >= 0) { 416 struct servent *sp; 417 418 sp = getservbyname("syslog", "udp"); 419 if (sp == NULL) { 420 errno = 0; 421 logerror("syslog/udp: unknown service"); 422 die(0); 423 } 424 memset(&sin, 0, sizeof(sin)); 425 sin.sin_family = AF_INET; 426 sin.sin_port = LogPort = sp->s_port; 427 428 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 429 logerror("bind"); 430 if (!Debug) 431 die(0); 432 } 433 } 434 if (finet >= 0 && SecureMode) { 435 if (shutdown(finet, SHUT_RD) < 0) { 436 logerror("shutdown"); 437 if (!Debug) 438 die(0); 439 } 440 } 441 442 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 443 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 444 fklog = -1; 445 if (fklog < 0) 446 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 447 448 /* tuck my process id away */ 449 fp = fopen(PidFile, "w"); 450 if (fp != NULL) { 451 fprintf(fp, "%d\n", getpid()); 452 (void) fclose(fp); 453 } 454 455 dprintf("off & running....\n"); 456 457 init(0); 458 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 459 sigemptyset(&mask); 460 sigaddset(&mask, SIGCHLD); 461 sact.sa_handler = init; 462 sact.sa_mask = mask; 463 sact.sa_flags = 0; 464 (void)sigaction(SIGHUP, &sact, NULL); 465 466 tvp = &tv; 467 tv.tv_sec = tv.tv_usec = 0; 468 469 for (;;) { 470 fd_set readfds; 471 int nfds = 0; 472 473 FD_ZERO(&readfds); 474 if (fklog != -1) { 475 FD_SET(fklog, &readfds); 476 if (fklog > nfds) 477 nfds = fklog; 478 } 479 if (finet != -1 && !SecureMode) { 480 FD_SET(finet, &readfds); 481 if (finet > nfds) 482 nfds = finet; 483 } 484 for (i = 0; i < nfunix; i++) { 485 if (funix[i] != -1) { 486 FD_SET(funix[i], &readfds); 487 if (funix[i] > nfds) 488 nfds = funix[i]; 489 } 490 } 491 492 /*dprintf("readfds = %#x\n", readfds);*/ 493 nfds = select(nfds+1, &readfds, (fd_set *)NULL, 494 (fd_set *)NULL, tvp); 495 if (nfds == 0) { 496 if (tvp) { 497 tvp = NULL; 498 if (ppid != 1) 499 kill(ppid, SIGALRM); 500 } 501 continue; 502 } 503 if (nfds < 0) { 504 if (errno != EINTR) 505 logerror("select"); 506 continue; 507 } 508 /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ 509 if (fklog != -1 && FD_ISSET(fklog, &readfds)) 510 readklog(); 511 if (finet != -1 && FD_ISSET(finet, &readfds)) { 512 len = sizeof(frominet); 513 l = recvfrom(finet, line, MAXLINE, 0, 514 (struct sockaddr *)&frominet, &len); 515 if (l > 0) { 516 line[l] = '\0'; 517 hname = cvthname(&frominet); 518 if (validate(&frominet, hname)) 519 printline(hname, line); 520 } else if (l < 0 && errno != EINTR) 521 logerror("recvfrom inet"); 522 } 523 for (i = 0; i < nfunix; i++) { 524 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 525 len = sizeof(fromunix); 526 l = recvfrom(funix[i], line, MAXLINE, 0, 527 (struct sockaddr *)&fromunix, &len); 528 if (l > 0) { 529 line[l] = '\0'; 530 printline(LocalHostName, line); 531 } else if (l < 0 && errno != EINTR) 532 logerror("recvfrom unix"); 533 } 534 } 535 } 536 } 537 538 static void 539 usage() 540 { 541 542 fprintf(stderr, "%s\n%s\n%s\n", 543 "usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]", 544 " [-m mark_interval] [-p log_socket]", 545 " [-l log_socket]"); 546 exit(1); 547 } 548 549 /* 550 * Take a raw input line, decode the message, and print the message 551 * on the appropriate log files. 552 */ 553 void 554 printline(hname, msg) 555 char *hname; 556 char *msg; 557 { 558 int c, pri; 559 char *p, *q, line[MAXLINE + 1]; 560 561 /* test for special codes */ 562 pri = DEFUPRI; 563 p = msg; 564 if (*p == '<') { 565 pri = 0; 566 while (isdigit(*++p)) 567 pri = 10 * pri + (*p - '0'); 568 if (*p == '>') 569 ++p; 570 } 571 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 572 pri = DEFUPRI; 573 574 /* don't allow users to log kernel messages */ 575 if (LOG_FAC(pri) == LOG_KERN) 576 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 577 578 q = line; 579 580 while ((c = *p++ & 0177) != '\0' && 581 q < &line[sizeof(line) - 1]) 582 if (iscntrl(c)) 583 if (c == '\n') 584 *q++ = ' '; 585 else if (c == '\t') 586 *q++ = '\t'; 587 else { 588 *q++ = '^'; 589 *q++ = c ^ 0100; 590 } 591 else 592 *q++ = c; 593 *q = '\0'; 594 595 logmsg(pri, line, hname, 0); 596 } 597 598 /* 599 * Read /dev/klog while data are available, split into lines. 600 */ 601 void 602 readklog() 603 { 604 char *p, *q, line[MAXLINE + 1]; 605 int len, i; 606 607 len = 0; 608 for (;;) { 609 i = read(fklog, line + len, MAXLINE - 1 - len); 610 if (i > 0) 611 line[i + len] = '\0'; 612 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 613 logerror("klog"); 614 fklog = -1; 615 break; 616 } else 617 break; 618 619 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 620 *q = '\0'; 621 printsys(p); 622 } 623 len = strlen(p); 624 if (len >= MAXLINE - 1) { 625 printsys(p); 626 len = 0; 627 } 628 if (len > 0) 629 memmove(line, p, len + 1); 630 } 631 if (len > 0) 632 printsys(line); 633 } 634 635 /* 636 * Take a raw input line from /dev/klog, format similar to syslog(). 637 */ 638 void 639 printsys(p) 640 char *p; 641 { 642 int pri, flags; 643 644 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 645 pri = DEFSPRI; 646 if (*p == '<') { 647 pri = 0; 648 while (isdigit(*++p)) 649 pri = 10 * pri + (*p - '0'); 650 if (*p == '>') 651 ++p; 652 } else { 653 /* kernel printf's come out on console */ 654 flags |= IGN_CONS; 655 } 656 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 657 pri = DEFSPRI; 658 logmsg(pri, p, LocalHostName, flags); 659 } 660 661 time_t now; 662 663 /* 664 * Log a message to the appropriate log files, users, etc. based on 665 * the priority. 666 */ 667 void 668 logmsg(pri, msg, from, flags) 669 int pri; 670 char *msg, *from; 671 int flags; 672 { 673 struct filed *f; 674 int i, fac, msglen, omask, prilev; 675 char *timestamp; 676 char prog[NAME_MAX+1]; 677 char buf[MAXLINE+1]; 678 679 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 680 pri, flags, from, msg); 681 682 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 683 684 /* 685 * Check to see if msg looks non-standard. 686 */ 687 msglen = strlen(msg); 688 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 689 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 690 flags |= ADDDATE; 691 692 (void)time(&now); 693 if (flags & ADDDATE) 694 timestamp = ctime(&now) + 4; 695 else { 696 timestamp = msg; 697 msg += 16; 698 msglen -= 16; 699 } 700 701 /* skip leading blanks */ 702 while(isspace(*msg)) { 703 msg++; 704 msglen--; 705 } 706 707 /* extract facility and priority level */ 708 if (flags & MARK) 709 fac = LOG_NFACILITIES; 710 else 711 fac = LOG_FAC(pri); 712 prilev = LOG_PRI(pri); 713 714 /* extract program name */ 715 for(i = 0; i < NAME_MAX; i++) { 716 if(!isalnum(msg[i])) 717 break; 718 prog[i] = msg[i]; 719 } 720 prog[i] = 0; 721 722 /* add kernel prefix for kernel messages */ 723 if (flags & ISKERNEL) { 724 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 725 msg = buf; 726 msglen = strlen(buf); 727 } 728 729 /* log the message to the particular outputs */ 730 if (!Initialized) { 731 f = &consfile; 732 f->f_file = open(ctty, O_WRONLY, 0); 733 734 if (f->f_file >= 0) { 735 fprintlog(f, flags, msg); 736 (void)close(f->f_file); 737 } 738 (void)sigsetmask(omask); 739 return; 740 } 741 for (f = Files; f; f = f->f_next) { 742 /* skip messages that are incorrect priority */ 743 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 744 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 745 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 746 ) 747 || f->f_pmask[fac] == INTERNAL_NOPRI) 748 continue; 749 /* skip messages with the incorrect program name */ 750 if(f->f_program) 751 if(strcmp(prog, f->f_program) != 0) 752 continue; 753 754 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 755 continue; 756 757 /* don't output marks to recently written files */ 758 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 759 continue; 760 761 /* 762 * suppress duplicate lines to this file 763 */ 764 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 765 !strcmp(msg, f->f_prevline) && 766 !strcasecmp(from, f->f_prevhost)) { 767 (void)strncpy(f->f_lasttime, timestamp, 15); 768 f->f_prevcount++; 769 dprintf("msg repeated %d times, %ld sec of %d\n", 770 f->f_prevcount, (long)(now - f->f_time), 771 repeatinterval[f->f_repeatcount]); 772 /* 773 * If domark would have logged this by now, 774 * flush it now (so we don't hold isolated messages), 775 * but back off so we'll flush less often 776 * in the future. 777 */ 778 if (now > REPEATTIME(f)) { 779 fprintlog(f, flags, (char *)NULL); 780 BACKOFF(f); 781 } 782 } else { 783 /* new line, save it */ 784 if (f->f_prevcount) 785 fprintlog(f, 0, (char *)NULL); 786 f->f_repeatcount = 0; 787 f->f_prevpri = pri; 788 (void)strncpy(f->f_lasttime, timestamp, 15); 789 (void)strncpy(f->f_prevhost, from, 790 sizeof(f->f_prevhost)-1); 791 f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0'; 792 if (msglen < MAXSVLINE) { 793 f->f_prevlen = msglen; 794 (void)strcpy(f->f_prevline, msg); 795 fprintlog(f, flags, (char *)NULL); 796 } else { 797 f->f_prevline[0] = 0; 798 f->f_prevlen = 0; 799 fprintlog(f, flags, msg); 800 } 801 } 802 } 803 (void)sigsetmask(omask); 804 } 805 806 void 807 fprintlog(f, flags, msg) 808 struct filed *f; 809 int flags; 810 char *msg; 811 { 812 struct iovec iov[7]; 813 struct iovec *v; 814 int l; 815 char line[MAXLINE + 1], repbuf[80], greetings[200]; 816 char *msgret; 817 818 v = iov; 819 if (f->f_type == F_WALL) { 820 v->iov_base = greetings; 821 v->iov_len = snprintf(greetings, sizeof greetings, 822 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 823 f->f_prevhost, ctime(&now)); 824 v++; 825 v->iov_base = ""; 826 v->iov_len = 0; 827 v++; 828 } else { 829 v->iov_base = f->f_lasttime; 830 v->iov_len = 15; 831 v++; 832 v->iov_base = " "; 833 v->iov_len = 1; 834 v++; 835 } 836 837 if (LogFacPri) { 838 static char fp_buf[30]; /* Hollow laugh */ 839 int fac = f->f_prevpri & LOG_FACMASK; 840 int pri = LOG_PRI(f->f_prevpri); 841 char *f_s = 0; 842 char f_n[5]; /* Hollow laugh */ 843 char *p_s = 0; 844 char p_n[5]; /* Hollow laugh */ 845 846 if (LogFacPri > 1) { 847 CODE *c; 848 849 for (c = facilitynames; c->c_name; c++) { 850 if (c->c_val == fac) { 851 f_s = c->c_name; 852 break; 853 } 854 } 855 for (c = prioritynames; c->c_name; c++) { 856 if (c->c_val == pri) { 857 p_s = c->c_name; 858 break; 859 } 860 } 861 } 862 if (!f_s) { 863 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 864 f_s = f_n; 865 } 866 if (!p_s) { 867 snprintf(p_n, sizeof p_n, "%d", pri); 868 p_s = p_n; 869 } 870 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 871 v->iov_base = fp_buf; 872 v->iov_len = strlen(fp_buf); 873 } else { 874 v->iov_base=""; 875 v->iov_len = 0; 876 } 877 v++; 878 879 v->iov_base = f->f_prevhost; 880 v->iov_len = strlen(v->iov_base); 881 v++; 882 v->iov_base = " "; 883 v->iov_len = 1; 884 v++; 885 886 if (msg) { 887 v->iov_base = msg; 888 v->iov_len = strlen(msg); 889 } else if (f->f_prevcount > 1) { 890 v->iov_base = repbuf; 891 v->iov_len = sprintf(repbuf, "last message repeated %d times", 892 f->f_prevcount); 893 } else { 894 v->iov_base = f->f_prevline; 895 v->iov_len = f->f_prevlen; 896 } 897 v++; 898 899 dprintf("Logging to %s", TypeNames[f->f_type]); 900 f->f_time = now; 901 902 switch (f->f_type) { 903 case F_UNUSED: 904 dprintf("\n"); 905 break; 906 907 case F_FORW: 908 dprintf(" %s\n", f->f_un.f_forw.f_hname); 909 /* check for local vs remote messages */ 910 if (strcasecmp(f->f_prevhost, LocalHostName)) 911 l = snprintf(line, sizeof line - 1, 912 "<%d>%.15s Forwarded from %s: %s", 913 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 914 iov[5].iov_base); 915 else 916 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 917 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 918 if (l > MAXLINE) 919 l = MAXLINE; 920 if ((finet >= 0) && 921 (sendto(finet, line, l, 0, 922 (struct sockaddr *)&f->f_un.f_forw.f_addr, 923 sizeof(f->f_un.f_forw.f_addr)) != l)) { 924 int e = errno; 925 (void)close(f->f_file); 926 f->f_type = F_UNUSED; 927 errno = e; 928 logerror("sendto"); 929 } 930 break; 931 932 case F_FILE: 933 dprintf(" %s\n", f->f_un.f_fname); 934 v->iov_base = "\n"; 935 v->iov_len = 1; 936 if (writev(f->f_file, iov, 7) < 0) { 937 int e = errno; 938 (void)close(f->f_file); 939 f->f_type = F_UNUSED; 940 errno = e; 941 logerror(f->f_un.f_fname); 942 } else if (flags & SYNC_FILE) 943 (void)fsync(f->f_file); 944 break; 945 946 case F_PIPE: 947 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 948 v->iov_base = "\n"; 949 v->iov_len = 1; 950 if (f->f_un.f_pipe.f_pid == 0) { 951 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 952 &f->f_un.f_pipe.f_pid)) < 0) { 953 f->f_type = F_UNUSED; 954 logerror(f->f_un.f_pipe.f_pname); 955 break; 956 } 957 } 958 if (writev(f->f_file, iov, 7) < 0) { 959 int e = errno; 960 (void)close(f->f_file); 961 if (f->f_un.f_pipe.f_pid > 0) 962 deadq_enter(f->f_un.f_pipe.f_pid, 963 f->f_un.f_pipe.f_pname); 964 f->f_un.f_pipe.f_pid = 0; 965 errno = e; 966 logerror(f->f_un.f_pipe.f_pname); 967 } 968 break; 969 970 case F_CONSOLE: 971 if (flags & IGN_CONS) { 972 dprintf(" (ignored)\n"); 973 break; 974 } 975 /* FALLTHROUGH */ 976 977 case F_TTY: 978 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 979 v->iov_base = "\r\n"; 980 v->iov_len = 2; 981 982 errno = 0; /* ttymsg() only sometimes returns an errno */ 983 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 984 f->f_type = F_UNUSED; 985 logerror(msgret); 986 } 987 break; 988 989 case F_USERS: 990 case F_WALL: 991 dprintf("\n"); 992 v->iov_base = "\r\n"; 993 v->iov_len = 2; 994 wallmsg(f, iov); 995 break; 996 } 997 f->f_prevcount = 0; 998 } 999 1000 /* 1001 * WALLMSG -- Write a message to the world at large 1002 * 1003 * Write the specified message to either the entire 1004 * world, or a list of approved users. 1005 */ 1006 void 1007 wallmsg(f, iov) 1008 struct filed *f; 1009 struct iovec *iov; 1010 { 1011 static int reenter; /* avoid calling ourselves */ 1012 FILE *uf; 1013 struct utmp ut; 1014 int i; 1015 char *p; 1016 char line[sizeof(ut.ut_line) + 1]; 1017 1018 if (reenter++) 1019 return; 1020 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1021 logerror(_PATH_UTMP); 1022 reenter = 0; 1023 return; 1024 } 1025 /* NOSTRICT */ 1026 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1027 if (ut.ut_name[0] == '\0') 1028 continue; 1029 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 1030 line[sizeof(ut.ut_line)] = '\0'; 1031 if (f->f_type == F_WALL) { 1032 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1033 errno = 0; /* already in msg */ 1034 logerror(p); 1035 } 1036 continue; 1037 } 1038 /* should we send the message to this user? */ 1039 for (i = 0; i < MAXUNAMES; i++) { 1040 if (!f->f_un.f_uname[i][0]) 1041 break; 1042 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1043 UT_NAMESIZE)) { 1044 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1045 != NULL) { 1046 errno = 0; /* already in msg */ 1047 logerror(p); 1048 } 1049 break; 1050 } 1051 } 1052 } 1053 (void)fclose(uf); 1054 reenter = 0; 1055 } 1056 1057 void 1058 reapchild(signo) 1059 int signo; 1060 { 1061 int status; 1062 pid_t pid; 1063 struct filed *f; 1064 1065 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1066 if (!Initialized) 1067 /* Don't tell while we are initting. */ 1068 continue; 1069 1070 /* First, look if it's a process from the dead queue. */ 1071 if (deadq_remove(pid)) 1072 goto oncemore; 1073 1074 /* Now, look in list of active processes. */ 1075 for (f = Files; f; f = f->f_next) 1076 if (f->f_type == F_PIPE && 1077 f->f_un.f_pipe.f_pid == pid) { 1078 (void)close(f->f_file); 1079 f->f_un.f_pipe.f_pid = 0; 1080 log_deadchild(pid, status, 1081 f->f_un.f_pipe.f_pname); 1082 break; 1083 } 1084 oncemore: 1085 continue; 1086 } 1087 } 1088 1089 /* 1090 * Return a printable representation of a host address. 1091 */ 1092 char * 1093 cvthname(f) 1094 struct sockaddr_in *f; 1095 { 1096 struct hostent *hp; 1097 sigset_t omask, nmask; 1098 char *p; 1099 1100 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1101 1102 if (f->sin_family != AF_INET) { 1103 dprintf("Malformed from address\n"); 1104 return ("???"); 1105 } 1106 sigemptyset(&nmask); 1107 sigaddset(&nmask, SIGHUP); 1108 sigprocmask(SIG_BLOCK, &nmask, &omask); 1109 hp = gethostbyaddr((char *)&f->sin_addr, 1110 sizeof(struct in_addr), f->sin_family); 1111 sigprocmask(SIG_SETMASK, &omask, NULL); 1112 if (hp == 0) { 1113 dprintf("Host name for your address (%s) unknown\n", 1114 inet_ntoa(f->sin_addr)); 1115 return (inet_ntoa(f->sin_addr)); 1116 } 1117 if ((p = strchr(hp->h_name, '.')) && 1118 strcasecmp(p + 1, LocalDomain) == 0) 1119 *p = '\0'; 1120 return (hp->h_name); 1121 } 1122 1123 void 1124 domark(signo) 1125 int signo; 1126 { 1127 struct filed *f; 1128 dq_t q; 1129 1130 now = time((time_t *)NULL); 1131 MarkSeq += TIMERINTVL; 1132 if (MarkSeq >= MarkInterval) { 1133 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1134 MarkSeq = 0; 1135 } 1136 1137 for (f = Files; f; f = f->f_next) { 1138 if (f->f_prevcount && now >= REPEATTIME(f)) { 1139 dprintf("flush %s: repeated %d times, %d sec.\n", 1140 TypeNames[f->f_type], f->f_prevcount, 1141 repeatinterval[f->f_repeatcount]); 1142 fprintlog(f, 0, (char *)NULL); 1143 BACKOFF(f); 1144 } 1145 } 1146 1147 /* Walk the dead queue, and see if we should signal somebody. */ 1148 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1149 switch (q->dq_timeout) { 1150 case 0: 1151 /* Already signalled once, try harder now. */ 1152 if (kill(q->dq_pid, SIGKILL) != 0) 1153 (void)deadq_remove(q->dq_pid); 1154 break; 1155 1156 case 1: 1157 /* 1158 * Timed out on dead queue, send terminate 1159 * signal. Note that we leave the removal 1160 * from the dead queue to reapchild(), which 1161 * will also log the event (unless the process 1162 * didn't even really exist, in case we simply 1163 * drop it from the dead queue). 1164 */ 1165 if (kill(q->dq_pid, SIGTERM) != 0) 1166 (void)deadq_remove(q->dq_pid); 1167 /* FALLTHROUGH */ 1168 1169 default: 1170 q->dq_timeout--; 1171 } 1172 1173 (void)alarm(TIMERINTVL); 1174 } 1175 1176 /* 1177 * Print syslogd errors some place. 1178 */ 1179 void 1180 logerror(type) 1181 const char *type; 1182 { 1183 char buf[512]; 1184 1185 if (errno) 1186 (void)snprintf(buf, 1187 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1188 else 1189 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1190 errno = 0; 1191 dprintf("%s\n", buf); 1192 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1193 } 1194 1195 void 1196 die(signo) 1197 int signo; 1198 { 1199 struct filed *f; 1200 int was_initialized; 1201 char buf[100]; 1202 int i; 1203 1204 was_initialized = Initialized; 1205 Initialized = 0; /* Don't log SIGCHLDs. */ 1206 for (f = Files; f != NULL; f = f->f_next) { 1207 /* flush any pending output */ 1208 if (f->f_prevcount) 1209 fprintlog(f, 0, (char *)NULL); 1210 if (f->f_type == F_PIPE) 1211 (void)close(f->f_file); 1212 } 1213 Initialized = was_initialized; 1214 if (signo) { 1215 dprintf("syslogd: exiting on signal %d\n", signo); 1216 (void)sprintf(buf, "exiting on signal %d", signo); 1217 errno = 0; 1218 logerror(buf); 1219 } 1220 for (i = 0; i < nfunix; i++) 1221 if (funixn[i] && funix[i] != -1) 1222 (void)unlink(funixn[i]); 1223 exit(1); 1224 } 1225 1226 /* 1227 * INIT -- Initialize syslogd from configuration table 1228 */ 1229 void 1230 init(signo) 1231 int signo; 1232 { 1233 int i; 1234 FILE *cf; 1235 struct filed *f, *next, **nextp; 1236 char *p; 1237 char cline[LINE_MAX]; 1238 char prog[NAME_MAX+1]; 1239 1240 dprintf("init\n"); 1241 1242 /* 1243 * Close all open log files. 1244 */ 1245 Initialized = 0; 1246 for (f = Files; f != NULL; f = next) { 1247 /* flush any pending output */ 1248 if (f->f_prevcount) 1249 fprintlog(f, 0, (char *)NULL); 1250 1251 switch (f->f_type) { 1252 case F_FILE: 1253 case F_FORW: 1254 case F_CONSOLE: 1255 case F_TTY: 1256 (void)close(f->f_file); 1257 break; 1258 case F_PIPE: 1259 (void)close(f->f_file); 1260 if (f->f_un.f_pipe.f_pid > 0) 1261 deadq_enter(f->f_un.f_pipe.f_pid, 1262 f->f_un.f_pipe.f_pname); 1263 f->f_un.f_pipe.f_pid = 0; 1264 break; 1265 } 1266 next = f->f_next; 1267 if(f->f_program) free(f->f_program); 1268 free((char *)f); 1269 } 1270 Files = NULL; 1271 nextp = &Files; 1272 1273 /* open the configuration file */ 1274 if ((cf = fopen(ConfFile, "r")) == NULL) { 1275 dprintf("cannot open %s\n", ConfFile); 1276 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1277 cfline("*.ERR\t/dev/console", *nextp, "*"); 1278 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1279 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1280 Initialized = 1; 1281 return; 1282 } 1283 1284 /* 1285 * Foreach line in the conf table, open that file. 1286 */ 1287 f = NULL; 1288 strcpy(prog, "*"); 1289 while (fgets(cline, sizeof(cline), cf) != NULL) { 1290 /* 1291 * check for end-of-section, comments, strip off trailing 1292 * spaces and newline character. #!prog is treated specially: 1293 * following lines apply only to that program. 1294 */ 1295 for (p = cline; isspace(*p); ++p) 1296 continue; 1297 if (*p == 0) 1298 continue; 1299 if(*p == '#') { 1300 p++; 1301 if(*p!='!') 1302 continue; 1303 } 1304 if(*p=='!') { 1305 p++; 1306 while(isspace(*p)) p++; 1307 if((!*p) || (*p == '*')) { 1308 strcpy(prog, "*"); 1309 continue; 1310 } 1311 for(i = 0; i < NAME_MAX; i++) { 1312 if(!isalnum(p[i])) 1313 break; 1314 prog[i] = p[i]; 1315 } 1316 prog[i] = 0; 1317 continue; 1318 } 1319 for (p = strchr(cline, '\0'); isspace(*--p);) 1320 continue; 1321 *++p = '\0'; 1322 f = (struct filed *)calloc(1, sizeof(*f)); 1323 *nextp = f; 1324 nextp = &f->f_next; 1325 cfline(cline, f, prog); 1326 } 1327 1328 /* close the configuration file */ 1329 (void)fclose(cf); 1330 1331 Initialized = 1; 1332 1333 if (Debug) { 1334 for (f = Files; f; f = f->f_next) { 1335 for (i = 0; i <= LOG_NFACILITIES; i++) 1336 if (f->f_pmask[i] == INTERNAL_NOPRI) 1337 printf("X "); 1338 else 1339 printf("%d ", f->f_pmask[i]); 1340 printf("%s: ", TypeNames[f->f_type]); 1341 switch (f->f_type) { 1342 case F_FILE: 1343 printf("%s", f->f_un.f_fname); 1344 break; 1345 1346 case F_CONSOLE: 1347 case F_TTY: 1348 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1349 break; 1350 1351 case F_FORW: 1352 printf("%s", f->f_un.f_forw.f_hname); 1353 break; 1354 1355 case F_PIPE: 1356 printf("%s", f->f_un.f_pipe.f_pname); 1357 break; 1358 1359 case F_USERS: 1360 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1361 printf("%s, ", f->f_un.f_uname[i]); 1362 break; 1363 } 1364 if(f->f_program) { 1365 printf(" (%s)", f->f_program); 1366 } 1367 printf("\n"); 1368 } 1369 } 1370 1371 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1372 dprintf("syslogd: restarted\n"); 1373 } 1374 1375 /* 1376 * Crack a configuration file line 1377 */ 1378 void 1379 cfline(line, f, prog) 1380 char *line; 1381 struct filed *f; 1382 char *prog; 1383 { 1384 struct hostent *hp; 1385 int i, pri; 1386 char *bp, *p, *q; 1387 char buf[MAXLINE], ebuf[100]; 1388 1389 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1390 1391 errno = 0; /* keep strerror() stuff out of logerror messages */ 1392 1393 /* clear out file entry */ 1394 memset(f, 0, sizeof(*f)); 1395 for (i = 0; i <= LOG_NFACILITIES; i++) 1396 f->f_pmask[i] = INTERNAL_NOPRI; 1397 1398 /* save program name if any */ 1399 if(prog && *prog=='*') prog = NULL; 1400 if(prog) { 1401 f->f_program = calloc(1, strlen(prog)+1); 1402 if(f->f_program) { 1403 strcpy(f->f_program, prog); 1404 } 1405 } 1406 1407 /* scan through the list of selectors */ 1408 for (p = line; *p && *p != '\t' && *p != ' ';) { 1409 int pri_done; 1410 int pri_cmp; 1411 1412 /* find the end of this facility name list */ 1413 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1414 continue; 1415 1416 /* get the priority comparison */ 1417 pri_cmp = 0; 1418 pri_done = 0; 1419 while (!pri_done) { 1420 switch (*q) { 1421 case '<': 1422 pri_cmp |= PRI_LT; 1423 q++; 1424 break; 1425 case '=': 1426 pri_cmp |= PRI_EQ; 1427 q++; 1428 break; 1429 case '>': 1430 pri_cmp |= PRI_GT; 1431 q++; 1432 break; 1433 default: 1434 pri_done++; 1435 break; 1436 } 1437 } 1438 if (!pri_cmp) 1439 pri_cmp = (UniquePriority) 1440 ? (PRI_EQ) 1441 : (PRI_EQ | PRI_GT) 1442 ; 1443 1444 /* collect priority name */ 1445 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1446 *bp++ = *q++; 1447 *bp = '\0'; 1448 1449 /* skip cruft */ 1450 while (strchr(",;", *q)) 1451 q++; 1452 1453 /* decode priority name */ 1454 if (*buf == '*') 1455 pri = LOG_PRIMASK + 1; 1456 else { 1457 pri = decode(buf, prioritynames); 1458 if (pri < 0) { 1459 (void)snprintf(ebuf, sizeof ebuf, 1460 "unknown priority name \"%s\"", buf); 1461 logerror(ebuf); 1462 return; 1463 } 1464 } 1465 1466 /* scan facilities */ 1467 while (*p && !strchr("\t.; ", *p)) { 1468 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1469 *bp++ = *p++; 1470 *bp = '\0'; 1471 1472 if (*buf == '*') 1473 for (i = 0; i < LOG_NFACILITIES; i++) { 1474 f->f_pmask[i] = pri; 1475 f->f_pcmp[i] = pri_cmp; 1476 } 1477 else { 1478 i = decode(buf, facilitynames); 1479 if (i < 0) { 1480 (void)snprintf(ebuf, sizeof ebuf, 1481 "unknown facility name \"%s\"", 1482 buf); 1483 logerror(ebuf); 1484 return; 1485 } 1486 f->f_pmask[i >> 3] = pri; 1487 f->f_pcmp[i >> 3] = pri_cmp; 1488 } 1489 while (*p == ',' || *p == ' ') 1490 p++; 1491 } 1492 1493 p = q; 1494 } 1495 1496 /* skip to action part */ 1497 while (*p == '\t' || *p == ' ') 1498 p++; 1499 1500 switch (*p) 1501 { 1502 case '@': 1503 (void)strncpy(f->f_un.f_forw.f_hname, ++p, 1504 sizeof(f->f_un.f_forw.f_hname)-1); 1505 f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0'; 1506 hp = gethostbyname(f->f_un.f_forw.f_hname); 1507 if (hp == NULL) { 1508 extern int h_errno; 1509 1510 logerror(hstrerror(h_errno)); 1511 break; 1512 } 1513 memset(&f->f_un.f_forw.f_addr, 0, 1514 sizeof(f->f_un.f_forw.f_addr)); 1515 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1516 f->f_un.f_forw.f_addr.sin_port = LogPort; 1517 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1518 f->f_type = F_FORW; 1519 break; 1520 1521 case '/': 1522 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1523 f->f_type = F_UNUSED; 1524 logerror(p); 1525 break; 1526 } 1527 if (isatty(f->f_file)) { 1528 if (strcmp(p, ctty) == 0) 1529 f->f_type = F_CONSOLE; 1530 else 1531 f->f_type = F_TTY; 1532 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1533 } else { 1534 (void)strcpy(f->f_un.f_fname, p); 1535 f->f_type = F_FILE; 1536 } 1537 break; 1538 1539 case '|': 1540 f->f_un.f_pipe.f_pid = 0; 1541 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1542 f->f_type = F_PIPE; 1543 break; 1544 1545 case '*': 1546 f->f_type = F_WALL; 1547 break; 1548 1549 default: 1550 for (i = 0; i < MAXUNAMES && *p; i++) { 1551 for (q = p; *q && *q != ','; ) 1552 q++; 1553 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1554 if ((q - p) > UT_NAMESIZE) 1555 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1556 else 1557 f->f_un.f_uname[i][q - p] = '\0'; 1558 while (*q == ',' || *q == ' ') 1559 q++; 1560 p = q; 1561 } 1562 f->f_type = F_USERS; 1563 break; 1564 } 1565 } 1566 1567 1568 /* 1569 * Decode a symbolic name to a numeric value 1570 */ 1571 int 1572 decode(name, codetab) 1573 const char *name; 1574 CODE *codetab; 1575 { 1576 CODE *c; 1577 char *p, buf[40]; 1578 1579 if (isdigit(*name)) 1580 return (atoi(name)); 1581 1582 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1583 if (isupper(*name)) 1584 *p = tolower(*name); 1585 else 1586 *p = *name; 1587 } 1588 *p = '\0'; 1589 for (c = codetab; c->c_name; c++) 1590 if (!strcmp(buf, c->c_name)) 1591 return (c->c_val); 1592 1593 return (-1); 1594 } 1595 1596 /* 1597 * fork off and become a daemon, but wait for the child to come online 1598 * before returing to the parent, or we get disk thrashing at boot etc. 1599 * Set a timer so we don't hang forever if it wedges. 1600 */ 1601 int 1602 waitdaemon(nochdir, noclose, maxwait) 1603 int nochdir, noclose, maxwait; 1604 { 1605 int fd; 1606 int status; 1607 pid_t pid, childpid; 1608 1609 switch (childpid = fork()) { 1610 case -1: 1611 return (-1); 1612 case 0: 1613 break; 1614 default: 1615 signal(SIGALRM, timedout); 1616 alarm(maxwait); 1617 while ((pid = wait3(&status, 0, NULL)) != -1) { 1618 if (WIFEXITED(status)) 1619 errx(1, "child pid %d exited with return code %d", 1620 pid, WEXITSTATUS(status)); 1621 if (WIFSIGNALED(status)) 1622 errx(1, "child pid %d exited on signal %d%s", 1623 pid, WTERMSIG(status), 1624 WCOREDUMP(status) ? " (core dumped)" : 1625 ""); 1626 if (pid == childpid) /* it's gone... */ 1627 break; 1628 } 1629 exit(0); 1630 } 1631 1632 if (setsid() == -1) 1633 return (-1); 1634 1635 if (!nochdir) 1636 (void)chdir("/"); 1637 1638 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1639 (void)dup2(fd, STDIN_FILENO); 1640 (void)dup2(fd, STDOUT_FILENO); 1641 (void)dup2(fd, STDERR_FILENO); 1642 if (fd > 2) 1643 (void)close (fd); 1644 } 1645 return (getppid()); 1646 } 1647 1648 /* 1649 * We get a SIGALRM from the child when it's running and finished doing it's 1650 * fsync()'s or O_SYNC writes for all the boot messages. 1651 * 1652 * We also get a signal from the kernel if the timer expires, so check to 1653 * see what happened. 1654 */ 1655 void 1656 timedout(sig) 1657 int sig __unused; 1658 { 1659 int left; 1660 left = alarm(0); 1661 signal(SIGALRM, SIG_DFL); 1662 if (left == 0) 1663 errx(1, "timed out waiting for child"); 1664 else 1665 exit(0); 1666 } 1667 1668 /* 1669 * Add `s' to the list of allowable peer addresses to accept messages 1670 * from. 1671 * 1672 * `s' is a string in the form: 1673 * 1674 * [*]domainname[:{servicename|portnumber|*}] 1675 * 1676 * or 1677 * 1678 * netaddr/maskbits[:{servicename|portnumber|*}] 1679 * 1680 * Returns -1 on error, 0 if the argument was valid. 1681 */ 1682 int 1683 allowaddr(s) 1684 char *s; 1685 { 1686 char *cp1, *cp2; 1687 struct allowedpeer ap; 1688 struct servent *se; 1689 regex_t re; 1690 int i; 1691 1692 if ((cp1 = strrchr(s, ':'))) { 1693 /* service/port provided */ 1694 *cp1++ = '\0'; 1695 if (strlen(cp1) == 1 && *cp1 == '*') 1696 /* any port allowed */ 1697 ap.port = htons(0); 1698 else if ((se = getservbyname(cp1, "udp"))) 1699 ap.port = se->s_port; 1700 else { 1701 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1702 if (*cp2 != '\0') 1703 return -1; /* port not numeric */ 1704 } 1705 } else { 1706 if ((se = getservbyname("syslog", "udp"))) 1707 ap.port = se->s_port; 1708 else 1709 /* sanity, should not happen */ 1710 ap.port = htons(514); 1711 } 1712 1713 /* the regexp's are ugly, but the cleanest way */ 1714 1715 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1716 REG_EXTENDED)) 1717 /* if RE compilation fails, that's an internal error */ 1718 abort(); 1719 if (regexec(&re, s, 0, 0, 0) == 0) { 1720 /* arg `s' is numeric */ 1721 ap.isnumeric = 1; 1722 if ((cp1 = strchr(s, '/')) != NULL) { 1723 *cp1++ = '\0'; 1724 i = atoi(cp1); 1725 if (i < 0 || i > 32) 1726 return -1; 1727 /* convert masklen to netmask */ 1728 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1729 } 1730 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1731 return -1; 1732 if (cp1 == NULL) { 1733 /* use default netmask */ 1734 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1735 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1736 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1737 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1738 else 1739 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1740 } 1741 } else { 1742 /* arg `s' is domain name */ 1743 ap.isnumeric = 0; 1744 ap.a_name = s; 1745 } 1746 regfree(&re); 1747 1748 if (Debug) { 1749 printf("allowaddr: rule %d: ", NumAllowed); 1750 if (ap.isnumeric) { 1751 printf("numeric, "); 1752 printf("addr = %s, ", 1753 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1754 printf("mask = %s; ", 1755 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1756 } else 1757 printf("domainname = %s; ", ap.a_name); 1758 printf("port = %d\n", ntohs(ap.port)); 1759 } 1760 1761 if ((AllowedPeers = realloc(AllowedPeers, 1762 ++NumAllowed * sizeof(struct allowedpeer))) 1763 == NULL) { 1764 fprintf(stderr, "Out of memory!\n"); 1765 exit(EX_OSERR); 1766 } 1767 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1768 return 0; 1769 } 1770 1771 /* 1772 * Validate that the remote peer has permission to log to us. 1773 */ 1774 int 1775 validate(sin, hname) 1776 struct sockaddr_in *sin; 1777 const char *hname; 1778 { 1779 int i; 1780 size_t l1, l2; 1781 char *cp, name[MAXHOSTNAMELEN]; 1782 struct allowedpeer *ap; 1783 1784 if (NumAllowed == 0) 1785 /* traditional behaviour, allow everything */ 1786 return 1; 1787 1788 strncpy(name, hname, sizeof name); 1789 if (strchr(name, '.') == NULL) { 1790 strncat(name, ".", sizeof name - strlen(name) - 1); 1791 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1792 } 1793 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1794 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1795 ntohs(sin->sin_port), name); 1796 1797 /* now, walk down the list */ 1798 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1799 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1800 dprintf("rejected in rule %d due to port mismatch.\n", i); 1801 continue; 1802 } 1803 1804 if (ap->isnumeric) { 1805 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1806 != ap->a_addr.s_addr) { 1807 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1808 continue; 1809 } 1810 } else { 1811 cp = ap->a_name; 1812 l1 = strlen(name); 1813 if (*cp == '*') { 1814 /* allow wildmatch */ 1815 cp++; 1816 l2 = strlen(cp); 1817 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1818 dprintf("rejected in rule %d due to name mismatch.\n", i); 1819 continue; 1820 } 1821 } else { 1822 /* exact match */ 1823 l2 = strlen(cp); 1824 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1825 dprintf("rejected in rule %d due to name mismatch.\n", i); 1826 continue; 1827 } 1828 } 1829 } 1830 dprintf("accepted in rule %d.\n", i); 1831 return 1; /* hooray! */ 1832 } 1833 return 0; 1834 } 1835 1836 /* 1837 * Fairly similar to popen(3), but returns an open descriptor, as 1838 * opposed to a FILE *. 1839 */ 1840 int 1841 p_open(prog, pid) 1842 char *prog; 1843 pid_t *pid; 1844 { 1845 int pfd[2], nulldesc, i; 1846 sigset_t omask, mask; 1847 char *argv[4]; /* sh -c cmd NULL */ 1848 char errmsg[200]; 1849 1850 if (pipe(pfd) == -1) 1851 return -1; 1852 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1853 /* we are royally screwed anyway */ 1854 return -1; 1855 1856 sigemptyset(&mask); 1857 sigaddset(&mask, SIGALRM); 1858 sigaddset(&mask, SIGHUP); 1859 sigprocmask(SIG_BLOCK, &mask, &omask); 1860 switch ((*pid = fork())) { 1861 case -1: 1862 sigprocmask(SIG_SETMASK, &omask, 0); 1863 close(nulldesc); 1864 return -1; 1865 1866 case 0: 1867 argv[0] = "sh"; 1868 argv[1] = "-c"; 1869 argv[2] = prog; 1870 argv[3] = NULL; 1871 1872 alarm(0); 1873 (void)setsid(); /* Avoid catching SIGHUPs. */ 1874 1875 /* 1876 * Throw away pending signals, and reset signal 1877 * behaviour to standard values. 1878 */ 1879 signal(SIGALRM, SIG_IGN); 1880 signal(SIGHUP, SIG_IGN); 1881 sigprocmask(SIG_SETMASK, &omask, 0); 1882 signal(SIGPIPE, SIG_DFL); 1883 signal(SIGQUIT, SIG_DFL); 1884 signal(SIGALRM, SIG_DFL); 1885 signal(SIGHUP, SIG_DFL); 1886 1887 dup2(pfd[0], STDIN_FILENO); 1888 dup2(nulldesc, STDOUT_FILENO); 1889 dup2(nulldesc, STDERR_FILENO); 1890 for (i = getdtablesize(); i > 2; i--) 1891 (void) close(i); 1892 1893 (void) execvp(_PATH_BSHELL, argv); 1894 _exit(255); 1895 } 1896 1897 sigprocmask(SIG_SETMASK, &omask, 0); 1898 close(nulldesc); 1899 close(pfd[0]); 1900 /* 1901 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1902 * supposed to get an EWOULDBLOCK on writev(2), which is 1903 * caught by the logic above anyway, which will in turn close 1904 * the pipe, and fork a new logging subprocess if necessary. 1905 * The stale subprocess will be killed some time later unless 1906 * it terminated itself due to closing its input pipe (so we 1907 * get rid of really dead puppies). 1908 */ 1909 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1910 /* This is bad. */ 1911 (void)snprintf(errmsg, sizeof errmsg, 1912 "Warning: cannot change pipe to PID %d to " 1913 "non-blocking behaviour.", 1914 (int)*pid); 1915 logerror(errmsg); 1916 } 1917 return pfd[1]; 1918 } 1919 1920 void 1921 deadq_enter(pid, name) 1922 pid_t pid; 1923 const char *name; 1924 { 1925 dq_t p; 1926 int status; 1927 1928 /* 1929 * Be paranoid, if we can't signal the process, don't enter it 1930 * into the dead queue (perhaps it's already dead). If possible, 1931 * we try to fetch and log the child's status. 1932 */ 1933 if (kill(pid, 0) != 0) { 1934 if (waitpid(pid, &status, WNOHANG) > 0) 1935 log_deadchild(pid, status, name); 1936 return; 1937 } 1938 1939 p = malloc(sizeof(struct deadq_entry)); 1940 if (p == 0) { 1941 errno = 0; 1942 logerror("panic: out of virtual memory!"); 1943 exit(1); 1944 } 1945 1946 p->dq_pid = pid; 1947 p->dq_timeout = DQ_TIMO_INIT; 1948 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1949 } 1950 1951 int 1952 deadq_remove(pid) 1953 pid_t pid; 1954 { 1955 dq_t q; 1956 1957 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1958 if (q->dq_pid == pid) { 1959 TAILQ_REMOVE(&deadq_head, q, dq_entries); 1960 free(q); 1961 return 1; 1962 } 1963 1964 return 0; 1965 } 1966 1967 void 1968 log_deadchild(pid, status, name) 1969 pid_t pid; 1970 int status; 1971 const char *name; 1972 { 1973 int code; 1974 char buf[256]; 1975 const char *reason; 1976 1977 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 1978 if (WIFSIGNALED(status)) { 1979 reason = "due to signal"; 1980 code = WTERMSIG(status); 1981 } else { 1982 reason = "with status"; 1983 code = WEXITSTATUS(status); 1984 if (code == 0) 1985 return; 1986 } 1987 (void)snprintf(buf, sizeof buf, 1988 "Logging subprocess %d (%s) exited %s %d.", 1989 pid, name, reason, code); 1990 logerror(buf); 1991 } 1992