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 char *f_host; /* host from which to recd. */ 151 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 152 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 153 #define PRI_LT 0x1 154 #define PRI_EQ 0x2 155 #define PRI_GT 0x4 156 char *f_program; /* program this applies to */ 157 union { 158 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 159 struct { 160 char f_hname[MAXHOSTNAMELEN+1]; 161 struct sockaddr_in f_addr; 162 } f_forw; /* forwarding address */ 163 char f_fname[MAXPATHLEN]; 164 struct { 165 char f_pname[MAXPATHLEN]; 166 pid_t f_pid; 167 } f_pipe; 168 } f_un; 169 char f_prevline[MAXSVLINE]; /* last message logged */ 170 char f_lasttime[16]; /* time of last occurrence */ 171 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 172 int f_prevpri; /* pri of f_prevline */ 173 int f_prevlen; /* length of f_prevline */ 174 int f_prevcount; /* repetition cnt of prevline */ 175 int f_repeatcount; /* number of "repeated" msgs */ 176 }; 177 178 /* 179 * Queue of about-to-be dead processes we should watch out for. 180 */ 181 182 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 183 struct stailhead *deadq_headp; 184 185 struct deadq_entry { 186 pid_t dq_pid; 187 int dq_timeout; 188 TAILQ_ENTRY(deadq_entry) dq_entries; 189 }; 190 191 /* 192 * The timeout to apply to processes waiting on the dead queue. Unit 193 * of measure is `mark intervals', i.e. 20 minutes by default. 194 * Processes on the dead queue will be terminated after that time. 195 */ 196 197 #define DQ_TIMO_INIT 2 198 199 typedef struct deadq_entry *dq_t; 200 201 202 /* 203 * Struct to hold records of network addresses that are allowed to log 204 * to us. 205 */ 206 struct allowedpeer { 207 int isnumeric; 208 u_short port; 209 union { 210 struct { 211 struct in_addr addr; 212 struct in_addr mask; 213 } numeric; 214 char *name; 215 } u; 216 #define a_addr u.numeric.addr 217 #define a_mask u.numeric.mask 218 #define a_name u.name 219 }; 220 221 222 /* 223 * Intervals at which we flush out "message repeated" messages, 224 * in seconds after previous message is logged. After each flush, 225 * we move to the next interval until we reach the largest. 226 */ 227 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 228 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 229 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 230 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 231 (f)->f_repeatcount = MAXREPEAT; \ 232 } 233 234 /* values for f_type */ 235 #define F_UNUSED 0 /* unused entry */ 236 #define F_FILE 1 /* regular file */ 237 #define F_TTY 2 /* terminal */ 238 #define F_CONSOLE 3 /* console terminal */ 239 #define F_FORW 4 /* remote machine */ 240 #define F_USERS 5 /* list of users */ 241 #define F_WALL 6 /* everyone logged on */ 242 #define F_PIPE 7 /* pipe to program */ 243 244 char *TypeNames[8] = { 245 "UNUSED", "FILE", "TTY", "CONSOLE", 246 "FORW", "USERS", "WALL", "PIPE" 247 }; 248 249 struct filed *Files; 250 struct filed consfile; 251 252 int Debug; /* debug flag */ 253 int resolve = 1; /* resolve hostname */ 254 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 255 char *LocalDomain; /* our local domain name */ 256 int finet = -1; /* Internet datagram socket */ 257 int fklog = -1; /* /dev/klog */ 258 int LogPort; /* port number for INET connections */ 259 int Initialized = 0; /* set when we have initialized ourselves */ 260 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 261 int MarkSeq = 0; /* mark sequence number */ 262 int SecureMode = 0; /* when true, receive only unix domain socks */ 263 264 char bootfile[MAXLINE+1]; /* booted kernel file */ 265 266 struct allowedpeer *AllowedPeers; 267 int NumAllowed = 0; /* # of AllowedPeer entries */ 268 269 int UniquePriority = 0; /* Only log specified priority? */ 270 int LogFacPri = 0; /* Put facility and priority in log message: */ 271 /* 0=no, 1=numeric, 2=names */ 272 273 int allowaddr __P((char *)); 274 void cfline __P((char *, struct filed *, char *, char *)); 275 char *cvthname __P((struct sockaddr_in *)); 276 void deadq_enter __P((pid_t, const char *)); 277 int deadq_remove __P((pid_t)); 278 int decode __P((const char *, CODE *)); 279 void die __P((int)); 280 void domark __P((int)); 281 void fprintlog __P((struct filed *, int, char *)); 282 void init __P((int)); 283 void logerror __P((const char *)); 284 void logmsg __P((int, char *, char *, int)); 285 void log_deadchild __P((pid_t, int, const char *)); 286 void printline __P((char *, char *)); 287 void printsys __P((char *)); 288 int p_open __P((char *, pid_t *)); 289 void readklog __P((void)); 290 void reapchild __P((int)); 291 char *ttymsg __P((struct iovec *, int, char *, int)); 292 static void usage __P((void)); 293 int validate __P((struct sockaddr_in *, const char *)); 294 void wallmsg __P((struct filed *, struct iovec *)); 295 int waitdaemon __P((int, int, int)); 296 void timedout __P((int)); 297 298 int 299 main(argc, argv) 300 int argc; 301 char *argv[]; 302 { 303 int ch, i, l; 304 struct sockaddr_un sunx, fromunix; 305 struct sockaddr_in sin, frominet; 306 FILE *fp; 307 char *p, *hname, line[MAXLINE + 1]; 308 struct timeval tv, *tvp; 309 struct sigaction sact; 310 sigset_t mask; 311 pid_t ppid = 1; 312 socklen_t len; 313 314 while ((ch = getopt(argc, argv, "a:dl:f:m:p:nsuv")) != -1) 315 switch (ch) { 316 case 'a': /* allow specific network addresses only */ 317 if (allowaddr(optarg) == -1) 318 usage(); 319 break; 320 case 'd': /* debug */ 321 Debug++; 322 break; 323 case 'f': /* configuration file */ 324 ConfFile = optarg; 325 break; 326 case 'l': 327 if (nfunix < MAXFUNIX) 328 funixn[nfunix++] = optarg; 329 else 330 warnx("out of descriptors, ignoring %s", 331 optarg); 332 break; 333 case 'm': /* mark interval */ 334 MarkInterval = atoi(optarg) * 60; 335 break; 336 case 'n': 337 resolve = 0; 338 break; 339 case 'p': /* path */ 340 funixn[0] = optarg; 341 break; 342 case 's': /* no network mode */ 343 SecureMode++; 344 break; 345 case 'u': /* only log specified priority */ 346 UniquePriority++; 347 break; 348 case 'v': /* log facility and priority */ 349 LogFacPri++; 350 break; 351 case '?': 352 default: 353 usage(); 354 } 355 if ((argc -= optind) != 0) 356 usage(); 357 358 if (!Debug) { 359 ppid = waitdaemon(0, 0, 30); 360 if (ppid < 0) 361 err(1, "could not become daemon"); 362 } else 363 setlinebuf(stdout); 364 365 if (NumAllowed) 366 endservent(); 367 368 consfile.f_type = F_CONSOLE; 369 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 370 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 371 if ((p = strchr(LocalHostName, '.')) != NULL) { 372 *p++ = '\0'; 373 LocalDomain = p; 374 } else 375 LocalDomain = ""; 376 (void)strcpy(bootfile, getbootfile()); 377 (void)signal(SIGTERM, die); 378 (void)signal(SIGINT, Debug ? die : SIG_IGN); 379 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 380 /* 381 * We don't want the SIGCHLD and SIGHUP handlers to interfere 382 * with each other; they are likely candidates for being called 383 * simultaneously (SIGHUP closes pipe descriptor, process dies, 384 * SIGCHLD happens). 385 */ 386 sigemptyset(&mask); 387 sigaddset(&mask, SIGHUP); 388 sact.sa_handler = reapchild; 389 sact.sa_mask = mask; 390 sact.sa_flags = SA_RESTART; 391 (void)sigaction(SIGCHLD, &sact, NULL); 392 (void)signal(SIGALRM, domark); 393 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 394 (void)alarm(TIMERINTVL); 395 396 TAILQ_INIT(&deadq_head); 397 398 #ifndef SUN_LEN 399 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 400 #endif 401 for (i = 0; i < nfunix; i++) { 402 memset(&sunx, 0, sizeof(sunx)); 403 sunx.sun_family = AF_UNIX; 404 (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 405 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 406 if (funix[i] < 0 || 407 bind(funix[i], (struct sockaddr *)&sunx, 408 SUN_LEN(&sunx)) < 0 || 409 chmod(funixn[i], 0666) < 0) { 410 (void) snprintf(line, sizeof line, 411 "cannot create %s", funixn[i]); 412 logerror(line); 413 dprintf("cannot create %s (%d)\n", funixn[i], errno); 414 if (i == 0) 415 die(0); 416 } 417 } 418 if (SecureMode <= 1) 419 finet = socket(AF_INET, SOCK_DGRAM, 0); 420 if (finet >= 0) { 421 struct servent *sp; 422 423 sp = getservbyname("syslog", "udp"); 424 if (sp == NULL) { 425 errno = 0; 426 logerror("syslog/udp: unknown service"); 427 die(0); 428 } 429 memset(&sin, 0, sizeof(sin)); 430 sin.sin_family = AF_INET; 431 sin.sin_port = LogPort = sp->s_port; 432 433 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 434 logerror("bind"); 435 if (!Debug) 436 die(0); 437 } 438 } 439 if (finet >= 0 && SecureMode) { 440 if (shutdown(finet, SHUT_RD) < 0) { 441 logerror("shutdown"); 442 if (!Debug) 443 die(0); 444 } 445 } 446 447 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 448 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 449 fklog = -1; 450 if (fklog < 0) 451 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 452 453 /* tuck my process id away */ 454 fp = fopen(PidFile, "w"); 455 if (fp != NULL) { 456 fprintf(fp, "%d\n", getpid()); 457 (void) fclose(fp); 458 } 459 460 dprintf("off & running....\n"); 461 462 init(0); 463 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 464 sigemptyset(&mask); 465 sigaddset(&mask, SIGCHLD); 466 sact.sa_handler = init; 467 sact.sa_mask = mask; 468 sact.sa_flags = SA_RESTART; 469 (void)sigaction(SIGHUP, &sact, NULL); 470 471 tvp = &tv; 472 tv.tv_sec = tv.tv_usec = 0; 473 474 for (;;) { 475 fd_set readfds; 476 int nfds = 0; 477 478 FD_ZERO(&readfds); 479 if (fklog != -1) { 480 FD_SET(fklog, &readfds); 481 if (fklog > nfds) 482 nfds = fklog; 483 } 484 if (finet != -1 && !SecureMode) { 485 FD_SET(finet, &readfds); 486 if (finet > nfds) 487 nfds = finet; 488 } 489 for (i = 0; i < nfunix; i++) { 490 if (funix[i] != -1) { 491 FD_SET(funix[i], &readfds); 492 if (funix[i] > nfds) 493 nfds = funix[i]; 494 } 495 } 496 497 /*dprintf("readfds = %#x\n", readfds);*/ 498 nfds = select(nfds+1, &readfds, (fd_set *)NULL, 499 (fd_set *)NULL, tvp); 500 if (nfds == 0) { 501 if (tvp) { 502 tvp = NULL; 503 if (ppid != 1) 504 kill(ppid, SIGALRM); 505 } 506 continue; 507 } 508 if (nfds < 0) { 509 if (errno != EINTR) 510 logerror("select"); 511 continue; 512 } 513 /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ 514 if (fklog != -1 && FD_ISSET(fklog, &readfds)) 515 readklog(); 516 if (finet != -1 && FD_ISSET(finet, &readfds)) { 517 len = sizeof(frominet); 518 l = recvfrom(finet, line, MAXLINE, 0, 519 (struct sockaddr *)&frominet, &len); 520 if (l > 0) { 521 line[l] = '\0'; 522 if (resolve) 523 hname = cvthname(&frominet); 524 else 525 hname = inet_ntoa(frominet.sin_addr); 526 if (validate(&frominet, hname)) 527 printline(hname, line); 528 } else if (l < 0 && errno != EINTR) 529 logerror("recvfrom inet"); 530 } 531 for (i = 0; i < nfunix; i++) { 532 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 533 len = sizeof(fromunix); 534 l = recvfrom(funix[i], line, MAXLINE, 0, 535 (struct sockaddr *)&fromunix, &len); 536 if (l > 0) { 537 line[l] = '\0'; 538 printline(LocalHostName, line); 539 } else if (l < 0 && errno != EINTR) 540 logerror("recvfrom unix"); 541 } 542 } 543 } 544 } 545 546 static void 547 usage() 548 { 549 550 fprintf(stderr, "%s\n%s\n%s\n", 551 "usage: syslogd [-dnsuv] [-a allowed_peer] [-f config_file]", 552 " [-m mark_interval] [-p log_socket]", 553 " [-l log_socket]"); 554 exit(1); 555 } 556 557 /* 558 * Take a raw input line, decode the message, and print the message 559 * on the appropriate log files. 560 */ 561 void 562 printline(hname, msg) 563 char *hname; 564 char *msg; 565 { 566 int c, pri; 567 char *p, *q, line[MAXLINE + 1]; 568 569 /* test for special codes */ 570 pri = DEFUPRI; 571 p = msg; 572 if (*p == '<') { 573 pri = 0; 574 while (isdigit(*++p)) 575 pri = 10 * pri + (*p - '0'); 576 if (*p == '>') 577 ++p; 578 } 579 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 580 pri = DEFUPRI; 581 582 /* don't allow users to log kernel messages */ 583 if (LOG_FAC(pri) == LOG_KERN) 584 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 585 586 q = line; 587 588 while ((c = (unsigned char)*p++) != '\0' && 589 q < &line[sizeof(line) - 3]) { 590 if ((c & 0x80) && c < 0xA0) { 591 c &= 0x7F; 592 *q++ = 'M'; 593 *q++ = '-'; 594 } 595 if (isascii(c) && iscntrl(c)) { 596 if (c == '\n') 597 *q++ = ' '; 598 else if (c == '\t') 599 *q++ = '\t'; 600 else { 601 *q++ = '^'; 602 *q++ = c ^ 0100; 603 } 604 } else 605 *q++ = c; 606 } 607 *q = '\0'; 608 609 logmsg(pri, line, hname, 0); 610 } 611 612 /* 613 * Read /dev/klog while data are available, split into lines. 614 */ 615 void 616 readklog() 617 { 618 char *p, *q, line[MAXLINE + 1]; 619 int len, i; 620 621 len = 0; 622 for (;;) { 623 i = read(fklog, line + len, MAXLINE - 1 - len); 624 if (i > 0) 625 line[i + len] = '\0'; 626 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 627 logerror("klog"); 628 fklog = -1; 629 break; 630 } else 631 break; 632 633 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 634 *q = '\0'; 635 printsys(p); 636 } 637 len = strlen(p); 638 if (len >= MAXLINE - 1) { 639 printsys(p); 640 len = 0; 641 } 642 if (len > 0) 643 memmove(line, p, len + 1); 644 } 645 if (len > 0) 646 printsys(line); 647 } 648 649 /* 650 * Take a raw input line from /dev/klog, format similar to syslog(). 651 */ 652 void 653 printsys(p) 654 char *p; 655 { 656 int pri, flags; 657 658 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 659 pri = DEFSPRI; 660 if (*p == '<') { 661 pri = 0; 662 while (isdigit(*++p)) 663 pri = 10 * pri + (*p - '0'); 664 if (*p == '>') 665 ++p; 666 } else { 667 /* kernel printf's come out on console */ 668 flags |= IGN_CONS; 669 } 670 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 671 pri = DEFSPRI; 672 logmsg(pri, p, LocalHostName, flags); 673 } 674 675 time_t now; 676 677 /* 678 * Log a message to the appropriate log files, users, etc. based on 679 * the priority. 680 */ 681 void 682 logmsg(pri, msg, from, flags) 683 int pri; 684 char *msg, *from; 685 int flags; 686 { 687 struct filed *f; 688 int i, fac, msglen, omask, prilev; 689 char *timestamp; 690 char prog[NAME_MAX+1]; 691 char buf[MAXLINE+1]; 692 693 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 694 pri, flags, from, msg); 695 696 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 697 698 /* 699 * Check to see if msg looks non-standard. 700 */ 701 msglen = strlen(msg); 702 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 703 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 704 flags |= ADDDATE; 705 706 (void)time(&now); 707 if (flags & ADDDATE) 708 timestamp = ctime(&now) + 4; 709 else { 710 timestamp = msg; 711 msg += 16; 712 msglen -= 16; 713 } 714 715 /* skip leading blanks */ 716 while (isspace(*msg)) { 717 msg++; 718 msglen--; 719 } 720 721 /* extract facility and priority level */ 722 if (flags & MARK) 723 fac = LOG_NFACILITIES; 724 else 725 fac = LOG_FAC(pri); 726 prilev = LOG_PRI(pri); 727 728 /* extract program name */ 729 for (i = 0; i < NAME_MAX; i++) { 730 if (!isalnum(msg[i])) 731 break; 732 prog[i] = msg[i]; 733 } 734 prog[i] = 0; 735 736 /* add kernel prefix for kernel messages */ 737 if (flags & ISKERNEL) { 738 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 739 msg = buf; 740 msglen = strlen(buf); 741 } 742 743 /* log the message to the particular outputs */ 744 if (!Initialized) { 745 f = &consfile; 746 f->f_file = open(ctty, O_WRONLY, 0); 747 748 if (f->f_file >= 0) { 749 fprintlog(f, flags, msg); 750 (void)close(f->f_file); 751 } 752 (void)sigsetmask(omask); 753 return; 754 } 755 for (f = Files; f; f = f->f_next) { 756 /* skip messages that are incorrect priority */ 757 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 758 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 759 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 760 ) 761 || f->f_pmask[fac] == INTERNAL_NOPRI) 762 continue; 763 /* skip messages with the incorrect hostname */ 764 if (f->f_host) 765 switch (f->f_host[0]) { 766 case '+': 767 if (strcmp(from, f->f_host + 1) != 0) 768 continue; 769 break; 770 case '-': 771 if (strcmp(from, f->f_host + 1) == 0) 772 continue; 773 break; 774 } 775 776 /* skip messages with the incorrect program name */ 777 if (f->f_program) 778 if (strcmp(prog, f->f_program) != 0) 779 continue; 780 781 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 782 continue; 783 784 /* don't output marks to recently written files */ 785 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 786 continue; 787 788 /* 789 * suppress duplicate lines to this file 790 */ 791 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 792 !strcmp(msg, f->f_prevline) && 793 !strcasecmp(from, f->f_prevhost)) { 794 (void)strncpy(f->f_lasttime, timestamp, 15); 795 f->f_prevcount++; 796 dprintf("msg repeated %d times, %ld sec of %d\n", 797 f->f_prevcount, (long)(now - f->f_time), 798 repeatinterval[f->f_repeatcount]); 799 /* 800 * If domark would have logged this by now, 801 * flush it now (so we don't hold isolated messages), 802 * but back off so we'll flush less often 803 * in the future. 804 */ 805 if (now > REPEATTIME(f)) { 806 fprintlog(f, flags, (char *)NULL); 807 BACKOFF(f); 808 } 809 } else { 810 /* new line, save it */ 811 if (f->f_prevcount) 812 fprintlog(f, 0, (char *)NULL); 813 f->f_repeatcount = 0; 814 f->f_prevpri = pri; 815 (void)strncpy(f->f_lasttime, timestamp, 15); 816 (void)strncpy(f->f_prevhost, from, 817 sizeof(f->f_prevhost)-1); 818 f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0'; 819 if (msglen < MAXSVLINE) { 820 f->f_prevlen = msglen; 821 (void)strcpy(f->f_prevline, msg); 822 fprintlog(f, flags, (char *)NULL); 823 } else { 824 f->f_prevline[0] = 0; 825 f->f_prevlen = 0; 826 fprintlog(f, flags, msg); 827 } 828 } 829 } 830 (void)sigsetmask(omask); 831 } 832 833 void 834 fprintlog(f, flags, msg) 835 struct filed *f; 836 int flags; 837 char *msg; 838 { 839 struct iovec iov[7]; 840 struct iovec *v; 841 int l; 842 char line[MAXLINE + 1], repbuf[80], greetings[200]; 843 char *msgret; 844 845 v = iov; 846 if (f->f_type == F_WALL) { 847 v->iov_base = greetings; 848 v->iov_len = snprintf(greetings, sizeof greetings, 849 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 850 f->f_prevhost, ctime(&now)); 851 v++; 852 v->iov_base = ""; 853 v->iov_len = 0; 854 v++; 855 } else { 856 v->iov_base = f->f_lasttime; 857 v->iov_len = 15; 858 v++; 859 v->iov_base = " "; 860 v->iov_len = 1; 861 v++; 862 } 863 864 if (LogFacPri) { 865 static char fp_buf[30]; /* Hollow laugh */ 866 int fac = f->f_prevpri & LOG_FACMASK; 867 int pri = LOG_PRI(f->f_prevpri); 868 char *f_s = 0; 869 char f_n[5]; /* Hollow laugh */ 870 char *p_s = 0; 871 char p_n[5]; /* Hollow laugh */ 872 873 if (LogFacPri > 1) { 874 CODE *c; 875 876 for (c = facilitynames; c->c_name; c++) { 877 if (c->c_val == fac) { 878 f_s = c->c_name; 879 break; 880 } 881 } 882 for (c = prioritynames; c->c_name; c++) { 883 if (c->c_val == pri) { 884 p_s = c->c_name; 885 break; 886 } 887 } 888 } 889 if (!f_s) { 890 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 891 f_s = f_n; 892 } 893 if (!p_s) { 894 snprintf(p_n, sizeof p_n, "%d", pri); 895 p_s = p_n; 896 } 897 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 898 v->iov_base = fp_buf; 899 v->iov_len = strlen(fp_buf); 900 } else { 901 v->iov_base=""; 902 v->iov_len = 0; 903 } 904 v++; 905 906 v->iov_base = f->f_prevhost; 907 v->iov_len = strlen(v->iov_base); 908 v++; 909 v->iov_base = " "; 910 v->iov_len = 1; 911 v++; 912 913 if (msg) { 914 v->iov_base = msg; 915 v->iov_len = strlen(msg); 916 } else if (f->f_prevcount > 1) { 917 v->iov_base = repbuf; 918 v->iov_len = sprintf(repbuf, "last message repeated %d times", 919 f->f_prevcount); 920 } else { 921 v->iov_base = f->f_prevline; 922 v->iov_len = f->f_prevlen; 923 } 924 v++; 925 926 dprintf("Logging to %s", TypeNames[f->f_type]); 927 f->f_time = now; 928 929 switch (f->f_type) { 930 case F_UNUSED: 931 dprintf("\n"); 932 break; 933 934 case F_FORW: 935 dprintf(" %s\n", f->f_un.f_forw.f_hname); 936 /* check for local vs remote messages */ 937 if (strcasecmp(f->f_prevhost, LocalHostName)) 938 l = snprintf(line, sizeof line - 1, 939 "<%d>%.15s Forwarded from %s: %s", 940 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 941 iov[5].iov_base); 942 else 943 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 944 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 945 if (l > MAXLINE) 946 l = MAXLINE; 947 if ((finet >= 0) && 948 (sendto(finet, line, l, 0, 949 (struct sockaddr *)&f->f_un.f_forw.f_addr, 950 sizeof(f->f_un.f_forw.f_addr)) != l)) { 951 int e = errno; 952 (void)close(f->f_file); 953 f->f_type = F_UNUSED; 954 errno = e; 955 logerror("sendto"); 956 } 957 break; 958 959 case F_FILE: 960 dprintf(" %s\n", f->f_un.f_fname); 961 v->iov_base = "\n"; 962 v->iov_len = 1; 963 if (writev(f->f_file, iov, 7) < 0) { 964 int e = errno; 965 (void)close(f->f_file); 966 f->f_type = F_UNUSED; 967 errno = e; 968 logerror(f->f_un.f_fname); 969 } else if (flags & SYNC_FILE) 970 (void)fsync(f->f_file); 971 break; 972 973 case F_PIPE: 974 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 975 v->iov_base = "\n"; 976 v->iov_len = 1; 977 if (f->f_un.f_pipe.f_pid == 0) { 978 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 979 &f->f_un.f_pipe.f_pid)) < 0) { 980 f->f_type = F_UNUSED; 981 logerror(f->f_un.f_pipe.f_pname); 982 break; 983 } 984 } 985 if (writev(f->f_file, iov, 7) < 0) { 986 int e = errno; 987 (void)close(f->f_file); 988 if (f->f_un.f_pipe.f_pid > 0) 989 deadq_enter(f->f_un.f_pipe.f_pid, 990 f->f_un.f_pipe.f_pname); 991 f->f_un.f_pipe.f_pid = 0; 992 errno = e; 993 logerror(f->f_un.f_pipe.f_pname); 994 } 995 break; 996 997 case F_CONSOLE: 998 if (flags & IGN_CONS) { 999 dprintf(" (ignored)\n"); 1000 break; 1001 } 1002 /* FALLTHROUGH */ 1003 1004 case F_TTY: 1005 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1006 v->iov_base = "\r\n"; 1007 v->iov_len = 2; 1008 1009 errno = 0; /* ttymsg() only sometimes returns an errno */ 1010 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1011 f->f_type = F_UNUSED; 1012 logerror(msgret); 1013 } 1014 break; 1015 1016 case F_USERS: 1017 case F_WALL: 1018 dprintf("\n"); 1019 v->iov_base = "\r\n"; 1020 v->iov_len = 2; 1021 wallmsg(f, iov); 1022 break; 1023 } 1024 f->f_prevcount = 0; 1025 } 1026 1027 /* 1028 * WALLMSG -- Write a message to the world at large 1029 * 1030 * Write the specified message to either the entire 1031 * world, or a list of approved users. 1032 */ 1033 void 1034 wallmsg(f, iov) 1035 struct filed *f; 1036 struct iovec *iov; 1037 { 1038 static int reenter; /* avoid calling ourselves */ 1039 FILE *uf; 1040 struct utmp ut; 1041 int i; 1042 char *p; 1043 char line[sizeof(ut.ut_line) + 1]; 1044 1045 if (reenter++) 1046 return; 1047 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1048 logerror(_PATH_UTMP); 1049 reenter = 0; 1050 return; 1051 } 1052 /* NOSTRICT */ 1053 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1054 if (ut.ut_name[0] == '\0') 1055 continue; 1056 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 1057 line[sizeof(ut.ut_line)] = '\0'; 1058 if (f->f_type == F_WALL) { 1059 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1060 errno = 0; /* already in msg */ 1061 logerror(p); 1062 } 1063 continue; 1064 } 1065 /* should we send the message to this user? */ 1066 for (i = 0; i < MAXUNAMES; i++) { 1067 if (!f->f_un.f_uname[i][0]) 1068 break; 1069 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1070 UT_NAMESIZE)) { 1071 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1072 != NULL) { 1073 errno = 0; /* already in msg */ 1074 logerror(p); 1075 } 1076 break; 1077 } 1078 } 1079 } 1080 (void)fclose(uf); 1081 reenter = 0; 1082 } 1083 1084 void 1085 reapchild(signo) 1086 int signo; 1087 { 1088 int status; 1089 pid_t pid; 1090 struct filed *f; 1091 1092 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1093 if (!Initialized) 1094 /* Don't tell while we are initting. */ 1095 continue; 1096 1097 /* First, look if it's a process from the dead queue. */ 1098 if (deadq_remove(pid)) 1099 goto oncemore; 1100 1101 /* Now, look in list of active processes. */ 1102 for (f = Files; f; f = f->f_next) 1103 if (f->f_type == F_PIPE && 1104 f->f_un.f_pipe.f_pid == pid) { 1105 (void)close(f->f_file); 1106 f->f_un.f_pipe.f_pid = 0; 1107 log_deadchild(pid, status, 1108 f->f_un.f_pipe.f_pname); 1109 break; 1110 } 1111 oncemore: 1112 continue; 1113 } 1114 } 1115 1116 /* 1117 * Return a printable representation of a host address. 1118 */ 1119 char * 1120 cvthname(f) 1121 struct sockaddr_in *f; 1122 { 1123 struct hostent *hp; 1124 sigset_t omask, nmask; 1125 char *p; 1126 1127 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1128 1129 if (f->sin_family != AF_INET) { 1130 dprintf("Malformed from address\n"); 1131 return ("???"); 1132 } 1133 sigemptyset(&nmask); 1134 sigaddset(&nmask, SIGHUP); 1135 sigprocmask(SIG_BLOCK, &nmask, &omask); 1136 hp = gethostbyaddr((char *)&f->sin_addr, 1137 sizeof(struct in_addr), f->sin_family); 1138 sigprocmask(SIG_SETMASK, &omask, NULL); 1139 if (hp == 0) { 1140 dprintf("Host name for your address (%s) unknown\n", 1141 inet_ntoa(f->sin_addr)); 1142 return (inet_ntoa(f->sin_addr)); 1143 } 1144 if ((p = strchr(hp->h_name, '.')) && 1145 strcasecmp(p + 1, LocalDomain) == 0) 1146 *p = '\0'; 1147 return (hp->h_name); 1148 } 1149 1150 void 1151 domark(signo) 1152 int signo; 1153 { 1154 struct filed *f; 1155 dq_t q; 1156 1157 now = time((time_t *)NULL); 1158 MarkSeq += TIMERINTVL; 1159 if (MarkSeq >= MarkInterval) { 1160 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1161 MarkSeq = 0; 1162 } 1163 1164 for (f = Files; f; f = f->f_next) { 1165 if (f->f_prevcount && now >= REPEATTIME(f)) { 1166 dprintf("flush %s: repeated %d times, %d sec.\n", 1167 TypeNames[f->f_type], f->f_prevcount, 1168 repeatinterval[f->f_repeatcount]); 1169 fprintlog(f, 0, (char *)NULL); 1170 BACKOFF(f); 1171 } 1172 } 1173 1174 /* Walk the dead queue, and see if we should signal somebody. */ 1175 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1176 switch (q->dq_timeout) { 1177 case 0: 1178 /* Already signalled once, try harder now. */ 1179 if (kill(q->dq_pid, SIGKILL) != 0) 1180 (void)deadq_remove(q->dq_pid); 1181 break; 1182 1183 case 1: 1184 /* 1185 * Timed out on dead queue, send terminate 1186 * signal. Note that we leave the removal 1187 * from the dead queue to reapchild(), which 1188 * will also log the event (unless the process 1189 * didn't even really exist, in case we simply 1190 * drop it from the dead queue). 1191 */ 1192 if (kill(q->dq_pid, SIGTERM) != 0) 1193 (void)deadq_remove(q->dq_pid); 1194 /* FALLTHROUGH */ 1195 1196 default: 1197 q->dq_timeout--; 1198 } 1199 1200 (void)alarm(TIMERINTVL); 1201 } 1202 1203 /* 1204 * Print syslogd errors some place. 1205 */ 1206 void 1207 logerror(type) 1208 const char *type; 1209 { 1210 char buf[512]; 1211 1212 if (errno) 1213 (void)snprintf(buf, 1214 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1215 else 1216 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1217 errno = 0; 1218 dprintf("%s\n", buf); 1219 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1220 } 1221 1222 void 1223 die(signo) 1224 int signo; 1225 { 1226 struct filed *f; 1227 int was_initialized; 1228 char buf[100]; 1229 int i; 1230 1231 was_initialized = Initialized; 1232 Initialized = 0; /* Don't log SIGCHLDs. */ 1233 for (f = Files; f != NULL; f = f->f_next) { 1234 /* flush any pending output */ 1235 if (f->f_prevcount) 1236 fprintlog(f, 0, (char *)NULL); 1237 if (f->f_type == F_PIPE) 1238 (void)close(f->f_file); 1239 } 1240 Initialized = was_initialized; 1241 if (signo) { 1242 dprintf("syslogd: exiting on signal %d\n", signo); 1243 (void)sprintf(buf, "exiting on signal %d", signo); 1244 errno = 0; 1245 logerror(buf); 1246 } 1247 for (i = 0; i < nfunix; i++) 1248 if (funixn[i] && funix[i] != -1) 1249 (void)unlink(funixn[i]); 1250 exit(1); 1251 } 1252 1253 /* 1254 * INIT -- Initialize syslogd from configuration table 1255 */ 1256 void 1257 init(signo) 1258 int signo; 1259 { 1260 int i; 1261 FILE *cf; 1262 struct filed *f, *next, **nextp; 1263 char *p; 1264 char cline[LINE_MAX]; 1265 char prog[NAME_MAX+1]; 1266 char host[MAXHOSTNAMELEN+1]; 1267 1268 dprintf("init\n"); 1269 1270 /* 1271 * Close all open log files. 1272 */ 1273 Initialized = 0; 1274 for (f = Files; f != NULL; f = next) { 1275 /* flush any pending output */ 1276 if (f->f_prevcount) 1277 fprintlog(f, 0, (char *)NULL); 1278 1279 switch (f->f_type) { 1280 case F_FILE: 1281 case F_FORW: 1282 case F_CONSOLE: 1283 case F_TTY: 1284 (void)close(f->f_file); 1285 break; 1286 case F_PIPE: 1287 (void)close(f->f_file); 1288 if (f->f_un.f_pipe.f_pid > 0) 1289 deadq_enter(f->f_un.f_pipe.f_pid, 1290 f->f_un.f_pipe.f_pname); 1291 f->f_un.f_pipe.f_pid = 0; 1292 break; 1293 } 1294 next = f->f_next; 1295 if (f->f_program) free(f->f_program); 1296 if (f->f_host) free(f->f_host); 1297 free((char *)f); 1298 } 1299 Files = NULL; 1300 nextp = &Files; 1301 1302 /* open the configuration file */ 1303 if ((cf = fopen(ConfFile, "r")) == NULL) { 1304 dprintf("cannot open %s\n", ConfFile); 1305 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1306 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1307 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1308 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1309 Initialized = 1; 1310 return; 1311 } 1312 1313 /* 1314 * Foreach line in the conf table, open that file. 1315 */ 1316 f = NULL; 1317 strcpy(host, "*"); 1318 strcpy(prog, "*"); 1319 while (fgets(cline, sizeof(cline), cf) != NULL) { 1320 /* 1321 * check for end-of-section, comments, strip off trailing 1322 * spaces and newline character. #!prog is treated specially: 1323 * following lines apply only to that program. 1324 */ 1325 for (p = cline; isspace(*p); ++p) 1326 continue; 1327 if (*p == 0) 1328 continue; 1329 if (*p == '#') { 1330 p++; 1331 if (*p != '!' && *p != '+' && *p != '-') 1332 continue; 1333 } 1334 if (*p == '+' || *p == '-') { 1335 host[0] = *p++; 1336 while (isspace(*p)) p++; 1337 if ((!*p) || (*p == '*')) { 1338 strcpy(host, "*"); 1339 continue; 1340 } 1341 if (*p == '@') 1342 p = LocalHostName; 1343 for (i = 1; i < MAXHOSTNAMELEN; i++) { 1344 if (!isalnum(*p) && *p != '.' && *p != '-') 1345 break; 1346 host[i] = *p++; 1347 } 1348 host[i] = '\0'; 1349 continue; 1350 } 1351 if (*p == '!') { 1352 p++; 1353 while (isspace(*p)) p++; 1354 if ((!*p) || (*p == '*')) { 1355 strcpy(prog, "*"); 1356 continue; 1357 } 1358 for (i = 0; i < NAME_MAX; i++) { 1359 if (!isalnum(p[i])) 1360 break; 1361 prog[i] = p[i]; 1362 } 1363 prog[i] = 0; 1364 continue; 1365 } 1366 for (p = strchr(cline, '\0'); isspace(*--p);) 1367 continue; 1368 *++p = '\0'; 1369 f = (struct filed *)calloc(1, sizeof(*f)); 1370 *nextp = f; 1371 nextp = &f->f_next; 1372 cfline(cline, f, prog, host); 1373 } 1374 1375 /* close the configuration file */ 1376 (void)fclose(cf); 1377 1378 Initialized = 1; 1379 1380 if (Debug) { 1381 for (f = Files; f; f = f->f_next) { 1382 for (i = 0; i <= LOG_NFACILITIES; i++) 1383 if (f->f_pmask[i] == INTERNAL_NOPRI) 1384 printf("X "); 1385 else 1386 printf("%d ", f->f_pmask[i]); 1387 printf("%s: ", TypeNames[f->f_type]); 1388 switch (f->f_type) { 1389 case F_FILE: 1390 printf("%s", f->f_un.f_fname); 1391 break; 1392 1393 case F_CONSOLE: 1394 case F_TTY: 1395 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1396 break; 1397 1398 case F_FORW: 1399 printf("%s", f->f_un.f_forw.f_hname); 1400 break; 1401 1402 case F_PIPE: 1403 printf("%s", f->f_un.f_pipe.f_pname); 1404 break; 1405 1406 case F_USERS: 1407 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1408 printf("%s, ", f->f_un.f_uname[i]); 1409 break; 1410 } 1411 if (f->f_program) 1412 printf(" (%s)", f->f_program); 1413 printf("\n"); 1414 } 1415 } 1416 1417 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1418 dprintf("syslogd: restarted\n"); 1419 } 1420 1421 /* 1422 * Crack a configuration file line 1423 */ 1424 void 1425 cfline(line, f, prog, host) 1426 char *line; 1427 struct filed *f; 1428 char *prog; 1429 char *host; 1430 { 1431 struct hostent *hp; 1432 int i, pri; 1433 char *bp, *p, *q; 1434 char buf[MAXLINE], ebuf[100]; 1435 1436 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1437 1438 errno = 0; /* keep strerror() stuff out of logerror messages */ 1439 1440 /* clear out file entry */ 1441 memset(f, 0, sizeof(*f)); 1442 for (i = 0; i <= LOG_NFACILITIES; i++) 1443 f->f_pmask[i] = INTERNAL_NOPRI; 1444 1445 /* save hostname if any */ 1446 if (host && *host == '*') 1447 host = NULL; 1448 if (host) 1449 f->f_host = strdup(host); 1450 1451 /* save program name if any */ 1452 if (prog && *prog == '*') 1453 prog = NULL; 1454 if (prog) 1455 f->f_program = strdup(prog); 1456 1457 /* scan through the list of selectors */ 1458 for (p = line; *p && *p != '\t' && *p != ' ';) { 1459 int pri_done; 1460 int pri_cmp; 1461 1462 /* find the end of this facility name list */ 1463 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1464 continue; 1465 1466 /* get the priority comparison */ 1467 pri_cmp = 0; 1468 pri_done = 0; 1469 while (!pri_done) { 1470 switch (*q) { 1471 case '<': 1472 pri_cmp |= PRI_LT; 1473 q++; 1474 break; 1475 case '=': 1476 pri_cmp |= PRI_EQ; 1477 q++; 1478 break; 1479 case '>': 1480 pri_cmp |= PRI_GT; 1481 q++; 1482 break; 1483 default: 1484 pri_done++; 1485 break; 1486 } 1487 } 1488 if (!pri_cmp) 1489 pri_cmp = (UniquePriority) 1490 ? (PRI_EQ) 1491 : (PRI_EQ | PRI_GT) 1492 ; 1493 1494 /* collect priority name */ 1495 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1496 *bp++ = *q++; 1497 *bp = '\0'; 1498 1499 /* skip cruft */ 1500 while (strchr(",;", *q)) 1501 q++; 1502 1503 /* decode priority name */ 1504 if (*buf == '*') 1505 pri = LOG_PRIMASK + 1; 1506 else { 1507 pri = decode(buf, prioritynames); 1508 if (pri < 0) { 1509 (void)snprintf(ebuf, sizeof ebuf, 1510 "unknown priority name \"%s\"", buf); 1511 logerror(ebuf); 1512 return; 1513 } 1514 } 1515 1516 /* scan facilities */ 1517 while (*p && !strchr("\t.; ", *p)) { 1518 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1519 *bp++ = *p++; 1520 *bp = '\0'; 1521 1522 if (*buf == '*') 1523 for (i = 0; i < LOG_NFACILITIES; i++) { 1524 f->f_pmask[i] = pri; 1525 f->f_pcmp[i] = pri_cmp; 1526 } 1527 else { 1528 i = decode(buf, facilitynames); 1529 if (i < 0) { 1530 (void)snprintf(ebuf, sizeof ebuf, 1531 "unknown facility name \"%s\"", 1532 buf); 1533 logerror(ebuf); 1534 return; 1535 } 1536 f->f_pmask[i >> 3] = pri; 1537 f->f_pcmp[i >> 3] = pri_cmp; 1538 } 1539 while (*p == ',' || *p == ' ') 1540 p++; 1541 } 1542 1543 p = q; 1544 } 1545 1546 /* skip to action part */ 1547 while (*p == '\t' || *p == ' ') 1548 p++; 1549 1550 switch (*p) 1551 { 1552 case '@': 1553 (void)strncpy(f->f_un.f_forw.f_hname, ++p, 1554 sizeof(f->f_un.f_forw.f_hname)-1); 1555 f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0'; 1556 hp = gethostbyname(f->f_un.f_forw.f_hname); 1557 if (hp == NULL) { 1558 extern int h_errno; 1559 1560 logerror(hstrerror(h_errno)); 1561 break; 1562 } 1563 memset(&f->f_un.f_forw.f_addr, 0, 1564 sizeof(f->f_un.f_forw.f_addr)); 1565 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1566 f->f_un.f_forw.f_addr.sin_port = LogPort; 1567 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1568 f->f_type = F_FORW; 1569 break; 1570 1571 case '/': 1572 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1573 f->f_type = F_UNUSED; 1574 logerror(p); 1575 break; 1576 } 1577 if (isatty(f->f_file)) { 1578 if (strcmp(p, ctty) == 0) 1579 f->f_type = F_CONSOLE; 1580 else 1581 f->f_type = F_TTY; 1582 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1583 } else { 1584 (void)strcpy(f->f_un.f_fname, p); 1585 f->f_type = F_FILE; 1586 } 1587 break; 1588 1589 case '|': 1590 f->f_un.f_pipe.f_pid = 0; 1591 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1592 f->f_type = F_PIPE; 1593 break; 1594 1595 case '*': 1596 f->f_type = F_WALL; 1597 break; 1598 1599 default: 1600 for (i = 0; i < MAXUNAMES && *p; i++) { 1601 for (q = p; *q && *q != ','; ) 1602 q++; 1603 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1604 if ((q - p) > UT_NAMESIZE) 1605 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1606 else 1607 f->f_un.f_uname[i][q - p] = '\0'; 1608 while (*q == ',' || *q == ' ') 1609 q++; 1610 p = q; 1611 } 1612 f->f_type = F_USERS; 1613 break; 1614 } 1615 } 1616 1617 1618 /* 1619 * Decode a symbolic name to a numeric value 1620 */ 1621 int 1622 decode(name, codetab) 1623 const char *name; 1624 CODE *codetab; 1625 { 1626 CODE *c; 1627 char *p, buf[40]; 1628 1629 if (isdigit(*name)) 1630 return (atoi(name)); 1631 1632 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1633 if (isupper(*name)) 1634 *p = tolower(*name); 1635 else 1636 *p = *name; 1637 } 1638 *p = '\0'; 1639 for (c = codetab; c->c_name; c++) 1640 if (!strcmp(buf, c->c_name)) 1641 return (c->c_val); 1642 1643 return (-1); 1644 } 1645 1646 /* 1647 * fork off and become a daemon, but wait for the child to come online 1648 * before returing to the parent, or we get disk thrashing at boot etc. 1649 * Set a timer so we don't hang forever if it wedges. 1650 */ 1651 int 1652 waitdaemon(nochdir, noclose, maxwait) 1653 int nochdir, noclose, maxwait; 1654 { 1655 int fd; 1656 int status; 1657 pid_t pid, childpid; 1658 1659 switch (childpid = fork()) { 1660 case -1: 1661 return (-1); 1662 case 0: 1663 break; 1664 default: 1665 signal(SIGALRM, timedout); 1666 alarm(maxwait); 1667 while ((pid = wait3(&status, 0, NULL)) != -1) { 1668 if (WIFEXITED(status)) 1669 errx(1, "child pid %d exited with return code %d", 1670 pid, WEXITSTATUS(status)); 1671 if (WIFSIGNALED(status)) 1672 errx(1, "child pid %d exited on signal %d%s", 1673 pid, WTERMSIG(status), 1674 WCOREDUMP(status) ? " (core dumped)" : 1675 ""); 1676 if (pid == childpid) /* it's gone... */ 1677 break; 1678 } 1679 exit(0); 1680 } 1681 1682 if (setsid() == -1) 1683 return (-1); 1684 1685 if (!nochdir) 1686 (void)chdir("/"); 1687 1688 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1689 (void)dup2(fd, STDIN_FILENO); 1690 (void)dup2(fd, STDOUT_FILENO); 1691 (void)dup2(fd, STDERR_FILENO); 1692 if (fd > 2) 1693 (void)close (fd); 1694 } 1695 return (getppid()); 1696 } 1697 1698 /* 1699 * We get a SIGALRM from the child when it's running and finished doing it's 1700 * fsync()'s or O_SYNC writes for all the boot messages. 1701 * 1702 * We also get a signal from the kernel if the timer expires, so check to 1703 * see what happened. 1704 */ 1705 void 1706 timedout(sig) 1707 int sig __unused; 1708 { 1709 int left; 1710 left = alarm(0); 1711 signal(SIGALRM, SIG_DFL); 1712 if (left == 0) 1713 errx(1, "timed out waiting for child"); 1714 else 1715 exit(0); 1716 } 1717 1718 /* 1719 * Add `s' to the list of allowable peer addresses to accept messages 1720 * from. 1721 * 1722 * `s' is a string in the form: 1723 * 1724 * [*]domainname[:{servicename|portnumber|*}] 1725 * 1726 * or 1727 * 1728 * netaddr/maskbits[:{servicename|portnumber|*}] 1729 * 1730 * Returns -1 on error, 0 if the argument was valid. 1731 */ 1732 int 1733 allowaddr(s) 1734 char *s; 1735 { 1736 char *cp1, *cp2; 1737 struct allowedpeer ap; 1738 struct servent *se; 1739 regex_t re; 1740 int i; 1741 1742 if ((cp1 = strrchr(s, ':'))) { 1743 /* service/port provided */ 1744 *cp1++ = '\0'; 1745 if (strlen(cp1) == 1 && *cp1 == '*') 1746 /* any port allowed */ 1747 ap.port = htons(0); 1748 else if ((se = getservbyname(cp1, "udp"))) 1749 ap.port = se->s_port; 1750 else { 1751 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1752 if (*cp2 != '\0') 1753 return -1; /* port not numeric */ 1754 } 1755 } else { 1756 if ((se = getservbyname("syslog", "udp"))) 1757 ap.port = se->s_port; 1758 else 1759 /* sanity, should not happen */ 1760 ap.port = htons(514); 1761 } 1762 1763 /* the regexp's are ugly, but the cleanest way */ 1764 1765 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1766 REG_EXTENDED)) 1767 /* if RE compilation fails, that's an internal error */ 1768 abort(); 1769 if (regexec(&re, s, 0, 0, 0) == 0) { 1770 /* arg `s' is numeric */ 1771 ap.isnumeric = 1; 1772 if ((cp1 = strchr(s, '/')) != NULL) { 1773 *cp1++ = '\0'; 1774 i = atoi(cp1); 1775 if (i < 0 || i > 32) 1776 return -1; 1777 /* convert masklen to netmask */ 1778 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1779 } 1780 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1781 return -1; 1782 if (cp1 == NULL) { 1783 /* use default netmask */ 1784 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1785 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1786 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1787 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1788 else 1789 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1790 } 1791 } else { 1792 /* arg `s' is domain name */ 1793 ap.isnumeric = 0; 1794 ap.a_name = s; 1795 } 1796 regfree(&re); 1797 1798 if (Debug) { 1799 printf("allowaddr: rule %d: ", NumAllowed); 1800 if (ap.isnumeric) { 1801 printf("numeric, "); 1802 printf("addr = %s, ", 1803 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1804 printf("mask = %s; ", 1805 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1806 } else 1807 printf("domainname = %s; ", ap.a_name); 1808 printf("port = %d\n", ntohs(ap.port)); 1809 } 1810 1811 if ((AllowedPeers = realloc(AllowedPeers, 1812 ++NumAllowed * sizeof(struct allowedpeer))) 1813 == NULL) { 1814 fprintf(stderr, "Out of memory!\n"); 1815 exit(EX_OSERR); 1816 } 1817 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1818 return 0; 1819 } 1820 1821 /* 1822 * Validate that the remote peer has permission to log to us. 1823 */ 1824 int 1825 validate(sin, hname) 1826 struct sockaddr_in *sin; 1827 const char *hname; 1828 { 1829 int i; 1830 size_t l1, l2; 1831 char *cp, name[MAXHOSTNAMELEN]; 1832 struct allowedpeer *ap; 1833 1834 if (NumAllowed == 0) 1835 /* traditional behaviour, allow everything */ 1836 return 1; 1837 1838 strlcpy(name, hname, sizeof name); 1839 if (strchr(name, '.') == NULL) { 1840 strlcat(name, ".", sizeof name); 1841 strlcat(name, LocalDomain, sizeof name); 1842 } 1843 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1844 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1845 ntohs(sin->sin_port), name); 1846 1847 /* now, walk down the list */ 1848 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1849 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1850 dprintf("rejected in rule %d due to port mismatch.\n", i); 1851 continue; 1852 } 1853 1854 if (ap->isnumeric) { 1855 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1856 != ap->a_addr.s_addr) { 1857 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1858 continue; 1859 } 1860 } else { 1861 cp = ap->a_name; 1862 l1 = strlen(name); 1863 if (*cp == '*') { 1864 /* allow wildmatch */ 1865 cp++; 1866 l2 = strlen(cp); 1867 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1868 dprintf("rejected in rule %d due to name mismatch.\n", i); 1869 continue; 1870 } 1871 } else { 1872 /* exact match */ 1873 l2 = strlen(cp); 1874 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1875 dprintf("rejected in rule %d due to name mismatch.\n", i); 1876 continue; 1877 } 1878 } 1879 } 1880 dprintf("accepted in rule %d.\n", i); 1881 return 1; /* hooray! */ 1882 } 1883 return 0; 1884 } 1885 1886 /* 1887 * Fairly similar to popen(3), but returns an open descriptor, as 1888 * opposed to a FILE *. 1889 */ 1890 int 1891 p_open(prog, pid) 1892 char *prog; 1893 pid_t *pid; 1894 { 1895 int pfd[2], nulldesc, i; 1896 sigset_t omask, mask; 1897 char *argv[4]; /* sh -c cmd NULL */ 1898 char errmsg[200]; 1899 1900 if (pipe(pfd) == -1) 1901 return -1; 1902 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1903 /* we are royally screwed anyway */ 1904 return -1; 1905 1906 sigemptyset(&mask); 1907 sigaddset(&mask, SIGALRM); 1908 sigaddset(&mask, SIGHUP); 1909 sigprocmask(SIG_BLOCK, &mask, &omask); 1910 switch ((*pid = fork())) { 1911 case -1: 1912 sigprocmask(SIG_SETMASK, &omask, 0); 1913 close(nulldesc); 1914 return -1; 1915 1916 case 0: 1917 argv[0] = "sh"; 1918 argv[1] = "-c"; 1919 argv[2] = prog; 1920 argv[3] = NULL; 1921 1922 alarm(0); 1923 (void)setsid(); /* Avoid catching SIGHUPs. */ 1924 1925 /* 1926 * Throw away pending signals, and reset signal 1927 * behaviour to standard values. 1928 */ 1929 signal(SIGALRM, SIG_IGN); 1930 signal(SIGHUP, SIG_IGN); 1931 sigprocmask(SIG_SETMASK, &omask, 0); 1932 signal(SIGPIPE, SIG_DFL); 1933 signal(SIGQUIT, SIG_DFL); 1934 signal(SIGALRM, SIG_DFL); 1935 signal(SIGHUP, SIG_DFL); 1936 1937 dup2(pfd[0], STDIN_FILENO); 1938 dup2(nulldesc, STDOUT_FILENO); 1939 dup2(nulldesc, STDERR_FILENO); 1940 for (i = getdtablesize(); i > 2; i--) 1941 (void) close(i); 1942 1943 (void) execvp(_PATH_BSHELL, argv); 1944 _exit(255); 1945 } 1946 1947 sigprocmask(SIG_SETMASK, &omask, 0); 1948 close(nulldesc); 1949 close(pfd[0]); 1950 /* 1951 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1952 * supposed to get an EWOULDBLOCK on writev(2), which is 1953 * caught by the logic above anyway, which will in turn close 1954 * the pipe, and fork a new logging subprocess if necessary. 1955 * The stale subprocess will be killed some time later unless 1956 * it terminated itself due to closing its input pipe (so we 1957 * get rid of really dead puppies). 1958 */ 1959 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1960 /* This is bad. */ 1961 (void)snprintf(errmsg, sizeof errmsg, 1962 "Warning: cannot change pipe to PID %d to " 1963 "non-blocking behaviour.", 1964 (int)*pid); 1965 logerror(errmsg); 1966 } 1967 return pfd[1]; 1968 } 1969 1970 void 1971 deadq_enter(pid, name) 1972 pid_t pid; 1973 const char *name; 1974 { 1975 dq_t p; 1976 int status; 1977 1978 /* 1979 * Be paranoid, if we can't signal the process, don't enter it 1980 * into the dead queue (perhaps it's already dead). If possible, 1981 * we try to fetch and log the child's status. 1982 */ 1983 if (kill(pid, 0) != 0) { 1984 if (waitpid(pid, &status, WNOHANG) > 0) 1985 log_deadchild(pid, status, name); 1986 return; 1987 } 1988 1989 p = malloc(sizeof(struct deadq_entry)); 1990 if (p == 0) { 1991 errno = 0; 1992 logerror("panic: out of virtual memory!"); 1993 exit(1); 1994 } 1995 1996 p->dq_pid = pid; 1997 p->dq_timeout = DQ_TIMO_INIT; 1998 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1999 } 2000 2001 int 2002 deadq_remove(pid) 2003 pid_t pid; 2004 { 2005 dq_t q; 2006 2007 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 2008 if (q->dq_pid == pid) { 2009 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2010 free(q); 2011 return 1; 2012 } 2013 2014 return 0; 2015 } 2016 2017 void 2018 log_deadchild(pid, status, name) 2019 pid_t pid; 2020 int status; 2021 const char *name; 2022 { 2023 int code; 2024 char buf[256]; 2025 const char *reason; 2026 2027 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2028 if (WIFSIGNALED(status)) { 2029 reason = "due to signal"; 2030 code = WTERMSIG(status); 2031 } else { 2032 reason = "with status"; 2033 code = WEXITSTATUS(status); 2034 if (code == 0) 2035 return; 2036 } 2037 (void)snprintf(buf, sizeof buf, 2038 "Logging subprocess %d (%s) exited %s %d.", 2039 pid, name, reason, code); 2040 logerror(buf); 2041 } 2042