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 int KeepKernFac = 0; /* Keep remotely logged kernel facility */ 273 274 int allowaddr __P((char *)); 275 void cfline __P((char *, struct filed *, char *, char *)); 276 char *cvthname __P((struct sockaddr_in *)); 277 void deadq_enter __P((pid_t, const char *)); 278 int deadq_remove __P((pid_t)); 279 int decode __P((const char *, CODE *)); 280 void die __P((int)); 281 void domark __P((int)); 282 void fprintlog __P((struct filed *, int, char *)); 283 void init __P((int)); 284 void logerror __P((const char *)); 285 void logmsg __P((int, char *, char *, int)); 286 void log_deadchild __P((pid_t, int, const char *)); 287 void printline __P((char *, char *)); 288 void printsys __P((char *)); 289 int p_open __P((char *, pid_t *)); 290 void readklog __P((void)); 291 void reapchild __P((int)); 292 char *ttymsg __P((struct iovec *, int, char *, int)); 293 static void usage __P((void)); 294 int validate __P((struct sockaddr_in *, const char *)); 295 void wallmsg __P((struct filed *, struct iovec *)); 296 int waitdaemon __P((int, int, int)); 297 void timedout __P((int)); 298 299 int 300 main(argc, argv) 301 int argc; 302 char *argv[]; 303 { 304 int ch, i, l; 305 struct sockaddr_un sunx, fromunix; 306 struct sockaddr_in sin, frominet; 307 FILE *fp; 308 char *p, *hname, line[MAXLINE + 1]; 309 struct timeval tv, *tvp; 310 struct sigaction sact; 311 sigset_t mask; 312 pid_t ppid = 1; 313 socklen_t len; 314 315 while ((ch = getopt(argc, argv, "a:df:kl:m:np:suv")) != -1) 316 switch (ch) { 317 case 'a': /* allow specific network addresses only */ 318 if (allowaddr(optarg) == -1) 319 usage(); 320 break; 321 case 'd': /* debug */ 322 Debug++; 323 break; 324 case 'f': /* configuration file */ 325 ConfFile = optarg; 326 break; 327 case 'k': /* keep remote kern fac */ 328 KeepKernFac = 1; 329 break; 330 case 'l': 331 if (nfunix < MAXFUNIX) 332 funixn[nfunix++] = optarg; 333 else 334 warnx("out of descriptors, ignoring %s", 335 optarg); 336 break; 337 case 'm': /* mark interval */ 338 MarkInterval = atoi(optarg) * 60; 339 break; 340 case 'n': 341 resolve = 0; 342 break; 343 case 'p': /* path */ 344 funixn[0] = optarg; 345 break; 346 case 's': /* no network mode */ 347 SecureMode++; 348 break; 349 case 'u': /* only log specified priority */ 350 UniquePriority++; 351 break; 352 case 'v': /* log facility and priority */ 353 LogFacPri++; 354 break; 355 case '?': 356 default: 357 usage(); 358 } 359 if ((argc -= optind) != 0) 360 usage(); 361 362 if (!Debug) { 363 ppid = waitdaemon(0, 0, 30); 364 if (ppid < 0) 365 err(1, "could not become daemon"); 366 } else 367 setlinebuf(stdout); 368 369 if (NumAllowed) 370 endservent(); 371 372 consfile.f_type = F_CONSOLE; 373 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 374 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 375 if ((p = strchr(LocalHostName, '.')) != NULL) { 376 *p++ = '\0'; 377 LocalDomain = p; 378 } else 379 LocalDomain = ""; 380 (void)strcpy(bootfile, getbootfile()); 381 (void)signal(SIGTERM, die); 382 (void)signal(SIGINT, Debug ? die : SIG_IGN); 383 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 384 /* 385 * We don't want the SIGCHLD and SIGHUP handlers to interfere 386 * with each other; they are likely candidates for being called 387 * simultaneously (SIGHUP closes pipe descriptor, process dies, 388 * SIGCHLD happens). 389 */ 390 sigemptyset(&mask); 391 sigaddset(&mask, SIGHUP); 392 sact.sa_handler = reapchild; 393 sact.sa_mask = mask; 394 sact.sa_flags = SA_RESTART; 395 (void)sigaction(SIGCHLD, &sact, NULL); 396 (void)signal(SIGALRM, domark); 397 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 398 (void)alarm(TIMERINTVL); 399 400 TAILQ_INIT(&deadq_head); 401 402 #ifndef SUN_LEN 403 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 404 #endif 405 for (i = 0; i < nfunix; i++) { 406 memset(&sunx, 0, sizeof(sunx)); 407 sunx.sun_family = AF_UNIX; 408 (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 409 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 410 if (funix[i] < 0 || 411 bind(funix[i], (struct sockaddr *)&sunx, 412 SUN_LEN(&sunx)) < 0 || 413 chmod(funixn[i], 0666) < 0) { 414 (void) snprintf(line, sizeof line, 415 "cannot create %s", funixn[i]); 416 logerror(line); 417 dprintf("cannot create %s (%d)\n", funixn[i], errno); 418 if (i == 0) 419 die(0); 420 } 421 } 422 if (SecureMode <= 1) 423 finet = socket(AF_INET, SOCK_DGRAM, 0); 424 if (finet >= 0) { 425 struct servent *sp; 426 427 sp = getservbyname("syslog", "udp"); 428 if (sp == NULL) { 429 errno = 0; 430 logerror("syslog/udp: unknown service"); 431 die(0); 432 } 433 memset(&sin, 0, sizeof(sin)); 434 sin.sin_family = AF_INET; 435 sin.sin_port = LogPort = sp->s_port; 436 437 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 438 logerror("bind"); 439 if (!Debug) 440 die(0); 441 } 442 } 443 if (finet >= 0 && SecureMode) { 444 if (shutdown(finet, SHUT_RD) < 0) { 445 logerror("shutdown"); 446 if (!Debug) 447 die(0); 448 } 449 } 450 451 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 452 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 453 fklog = -1; 454 if (fklog < 0) 455 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 456 457 /* tuck my process id away */ 458 fp = fopen(PidFile, "w"); 459 if (fp != NULL) { 460 fprintf(fp, "%d\n", getpid()); 461 (void) fclose(fp); 462 } 463 464 dprintf("off & running....\n"); 465 466 init(0); 467 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 468 sigemptyset(&mask); 469 sigaddset(&mask, SIGCHLD); 470 sact.sa_handler = init; 471 sact.sa_mask = mask; 472 sact.sa_flags = SA_RESTART; 473 (void)sigaction(SIGHUP, &sact, NULL); 474 475 tvp = &tv; 476 tv.tv_sec = tv.tv_usec = 0; 477 478 for (;;) { 479 fd_set readfds; 480 int nfds = 0; 481 482 FD_ZERO(&readfds); 483 if (fklog != -1) { 484 FD_SET(fklog, &readfds); 485 if (fklog > nfds) 486 nfds = fklog; 487 } 488 if (finet != -1 && !SecureMode) { 489 FD_SET(finet, &readfds); 490 if (finet > nfds) 491 nfds = finet; 492 } 493 for (i = 0; i < nfunix; i++) { 494 if (funix[i] != -1) { 495 FD_SET(funix[i], &readfds); 496 if (funix[i] > nfds) 497 nfds = funix[i]; 498 } 499 } 500 501 /*dprintf("readfds = %#x\n", readfds);*/ 502 nfds = select(nfds+1, &readfds, (fd_set *)NULL, 503 (fd_set *)NULL, tvp); 504 if (nfds == 0) { 505 if (tvp) { 506 tvp = NULL; 507 if (ppid != 1) 508 kill(ppid, SIGALRM); 509 } 510 continue; 511 } 512 if (nfds < 0) { 513 if (errno != EINTR) 514 logerror("select"); 515 continue; 516 } 517 /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ 518 if (fklog != -1 && FD_ISSET(fklog, &readfds)) 519 readklog(); 520 if (finet != -1 && FD_ISSET(finet, &readfds)) { 521 len = sizeof(frominet); 522 l = recvfrom(finet, line, MAXLINE, 0, 523 (struct sockaddr *)&frominet, &len); 524 if (l > 0) { 525 line[l] = '\0'; 526 if (resolve) 527 hname = cvthname(&frominet); 528 else 529 hname = inet_ntoa(frominet.sin_addr); 530 if (validate(&frominet, hname)) 531 printline(hname, line); 532 } else if (l < 0 && errno != EINTR) 533 logerror("recvfrom inet"); 534 } 535 for (i = 0; i < nfunix; i++) { 536 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 537 len = sizeof(fromunix); 538 l = recvfrom(funix[i], line, MAXLINE, 0, 539 (struct sockaddr *)&fromunix, &len); 540 if (l > 0) { 541 line[l] = '\0'; 542 printline(LocalHostName, line); 543 } else if (l < 0 && errno != EINTR) 544 logerror("recvfrom unix"); 545 } 546 } 547 } 548 } 549 550 static void 551 usage() 552 { 553 554 fprintf(stderr, "%s\n%s\n%s\n", 555 "usage: syslogd [-dnsuv] [-a allowed_peer] [-f config_file]", 556 " [-m mark_interval] [-p log_socket]", 557 " [-l log_socket]"); 558 exit(1); 559 } 560 561 /* 562 * Take a raw input line, decode the message, and print the message 563 * on the appropriate log files. 564 */ 565 void 566 printline(hname, msg) 567 char *hname; 568 char *msg; 569 { 570 int c, pri; 571 char *p, *q, line[MAXLINE + 1]; 572 573 /* test for special codes */ 574 pri = DEFUPRI; 575 p = msg; 576 if (*p == '<') { 577 pri = 0; 578 while (isdigit(*++p)) 579 pri = 10 * pri + (*p - '0'); 580 if (*p == '>') 581 ++p; 582 } 583 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 584 pri = DEFUPRI; 585 586 /* don't allow users to log kernel messages */ 587 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 588 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 589 590 q = line; 591 592 while ((c = (unsigned char)*p++) != '\0' && 593 q < &line[sizeof(line) - 4]) { 594 if ((c & 0x80) && c < 0xA0) { 595 c &= 0x7F; 596 *q++ = 'M'; 597 *q++ = '-'; 598 } 599 if (isascii(c) && iscntrl(c)) { 600 if (c == '\n') 601 *q++ = ' '; 602 else if (c == '\t') 603 *q++ = '\t'; 604 else { 605 *q++ = '^'; 606 *q++ = c ^ 0100; 607 } 608 } else 609 *q++ = c; 610 } 611 *q = '\0'; 612 613 logmsg(pri, line, hname, 0); 614 } 615 616 /* 617 * Read /dev/klog while data are available, split into lines. 618 */ 619 void 620 readklog() 621 { 622 char *p, *q, line[MAXLINE + 1]; 623 int len, i; 624 625 len = 0; 626 for (;;) { 627 i = read(fklog, line + len, MAXLINE - 1 - len); 628 if (i > 0) 629 line[i + len] = '\0'; 630 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 631 logerror("klog"); 632 fklog = -1; 633 break; 634 } else 635 break; 636 637 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 638 *q = '\0'; 639 printsys(p); 640 } 641 len = strlen(p); 642 if (len >= MAXLINE - 1) { 643 printsys(p); 644 len = 0; 645 } 646 if (len > 0) 647 memmove(line, p, len + 1); 648 } 649 if (len > 0) 650 printsys(line); 651 } 652 653 /* 654 * Take a raw input line from /dev/klog, format similar to syslog(). 655 */ 656 void 657 printsys(p) 658 char *p; 659 { 660 int pri, flags; 661 662 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 663 pri = DEFSPRI; 664 if (*p == '<') { 665 pri = 0; 666 while (isdigit(*++p)) 667 pri = 10 * pri + (*p - '0'); 668 if (*p == '>') 669 ++p; 670 } else { 671 /* kernel printf's come out on console */ 672 flags |= IGN_CONS; 673 } 674 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 675 pri = DEFSPRI; 676 logmsg(pri, p, LocalHostName, flags); 677 } 678 679 time_t now; 680 681 /* 682 * Log a message to the appropriate log files, users, etc. based on 683 * the priority. 684 */ 685 void 686 logmsg(pri, msg, from, flags) 687 int pri; 688 char *msg, *from; 689 int flags; 690 { 691 struct filed *f; 692 int i, fac, msglen, omask, prilev; 693 char *timestamp; 694 char prog[NAME_MAX+1]; 695 char buf[MAXLINE+1]; 696 697 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 698 pri, flags, from, msg); 699 700 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 701 702 /* 703 * Check to see if msg looks non-standard. 704 */ 705 msglen = strlen(msg); 706 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 707 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 708 flags |= ADDDATE; 709 710 (void)time(&now); 711 if (flags & ADDDATE) 712 timestamp = ctime(&now) + 4; 713 else { 714 timestamp = msg; 715 msg += 16; 716 msglen -= 16; 717 } 718 719 /* skip leading blanks */ 720 while (isspace(*msg)) { 721 msg++; 722 msglen--; 723 } 724 725 /* extract facility and priority level */ 726 if (flags & MARK) 727 fac = LOG_NFACILITIES; 728 else 729 fac = LOG_FAC(pri); 730 prilev = LOG_PRI(pri); 731 732 /* extract program name */ 733 for (i = 0; i < NAME_MAX; i++) { 734 if (!isalnum(msg[i])) 735 break; 736 prog[i] = msg[i]; 737 } 738 prog[i] = 0; 739 740 /* add kernel prefix for kernel messages */ 741 if (flags & ISKERNEL) { 742 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 743 msg = buf; 744 msglen = strlen(buf); 745 } 746 747 /* log the message to the particular outputs */ 748 if (!Initialized) { 749 f = &consfile; 750 f->f_file = open(ctty, O_WRONLY, 0); 751 752 if (f->f_file >= 0) { 753 fprintlog(f, flags, msg); 754 (void)close(f->f_file); 755 } 756 (void)sigsetmask(omask); 757 return; 758 } 759 for (f = Files; f; f = f->f_next) { 760 /* skip messages that are incorrect priority */ 761 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 762 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 763 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 764 ) 765 || f->f_pmask[fac] == INTERNAL_NOPRI) 766 continue; 767 /* skip messages with the incorrect hostname */ 768 if (f->f_host) 769 switch (f->f_host[0]) { 770 case '+': 771 if (strcmp(from, f->f_host + 1) != 0) 772 continue; 773 break; 774 case '-': 775 if (strcmp(from, f->f_host + 1) == 0) 776 continue; 777 break; 778 } 779 780 /* skip messages with the incorrect program name */ 781 if (f->f_program) 782 if (strcmp(prog, f->f_program) != 0) 783 continue; 784 785 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 786 continue; 787 788 /* don't output marks to recently written files */ 789 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 790 continue; 791 792 /* 793 * suppress duplicate lines to this file 794 */ 795 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 796 !strcmp(msg, f->f_prevline) && 797 !strcasecmp(from, f->f_prevhost)) { 798 (void)strncpy(f->f_lasttime, timestamp, 15); 799 f->f_prevcount++; 800 dprintf("msg repeated %d times, %ld sec of %d\n", 801 f->f_prevcount, (long)(now - f->f_time), 802 repeatinterval[f->f_repeatcount]); 803 /* 804 * If domark would have logged this by now, 805 * flush it now (so we don't hold isolated messages), 806 * but back off so we'll flush less often 807 * in the future. 808 */ 809 if (now > REPEATTIME(f)) { 810 fprintlog(f, flags, (char *)NULL); 811 BACKOFF(f); 812 } 813 } else { 814 /* new line, save it */ 815 if (f->f_prevcount) 816 fprintlog(f, 0, (char *)NULL); 817 f->f_repeatcount = 0; 818 f->f_prevpri = pri; 819 (void)strncpy(f->f_lasttime, timestamp, 15); 820 (void)strncpy(f->f_prevhost, from, 821 sizeof(f->f_prevhost)-1); 822 f->f_prevhost[sizeof(f->f_prevhost)-1] = '\0'; 823 if (msglen < MAXSVLINE) { 824 f->f_prevlen = msglen; 825 (void)strcpy(f->f_prevline, msg); 826 fprintlog(f, flags, (char *)NULL); 827 } else { 828 f->f_prevline[0] = 0; 829 f->f_prevlen = 0; 830 fprintlog(f, flags, msg); 831 } 832 } 833 } 834 (void)sigsetmask(omask); 835 } 836 837 void 838 fprintlog(f, flags, msg) 839 struct filed *f; 840 int flags; 841 char *msg; 842 { 843 struct iovec iov[7]; 844 struct iovec *v; 845 int l; 846 char line[MAXLINE + 1], repbuf[80], greetings[200]; 847 char *msgret; 848 849 v = iov; 850 if (f->f_type == F_WALL) { 851 v->iov_base = greetings; 852 v->iov_len = snprintf(greetings, sizeof greetings, 853 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 854 f->f_prevhost, ctime(&now)); 855 v++; 856 v->iov_base = ""; 857 v->iov_len = 0; 858 v++; 859 } else { 860 v->iov_base = f->f_lasttime; 861 v->iov_len = 15; 862 v++; 863 v->iov_base = " "; 864 v->iov_len = 1; 865 v++; 866 } 867 868 if (LogFacPri) { 869 static char fp_buf[30]; /* Hollow laugh */ 870 int fac = f->f_prevpri & LOG_FACMASK; 871 int pri = LOG_PRI(f->f_prevpri); 872 char *f_s = 0; 873 char f_n[5]; /* Hollow laugh */ 874 char *p_s = 0; 875 char p_n[5]; /* Hollow laugh */ 876 877 if (LogFacPri > 1) { 878 CODE *c; 879 880 for (c = facilitynames; c->c_name; c++) { 881 if (c->c_val == fac) { 882 f_s = c->c_name; 883 break; 884 } 885 } 886 for (c = prioritynames; c->c_name; c++) { 887 if (c->c_val == pri) { 888 p_s = c->c_name; 889 break; 890 } 891 } 892 } 893 if (!f_s) { 894 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 895 f_s = f_n; 896 } 897 if (!p_s) { 898 snprintf(p_n, sizeof p_n, "%d", pri); 899 p_s = p_n; 900 } 901 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 902 v->iov_base = fp_buf; 903 v->iov_len = strlen(fp_buf); 904 } else { 905 v->iov_base=""; 906 v->iov_len = 0; 907 } 908 v++; 909 910 v->iov_base = f->f_prevhost; 911 v->iov_len = strlen(v->iov_base); 912 v++; 913 v->iov_base = " "; 914 v->iov_len = 1; 915 v++; 916 917 if (msg) { 918 v->iov_base = msg; 919 v->iov_len = strlen(msg); 920 } else if (f->f_prevcount > 1) { 921 v->iov_base = repbuf; 922 v->iov_len = sprintf(repbuf, "last message repeated %d times", 923 f->f_prevcount); 924 } else { 925 v->iov_base = f->f_prevline; 926 v->iov_len = f->f_prevlen; 927 } 928 v++; 929 930 dprintf("Logging to %s", TypeNames[f->f_type]); 931 f->f_time = now; 932 933 switch (f->f_type) { 934 case F_UNUSED: 935 dprintf("\n"); 936 break; 937 938 case F_FORW: 939 dprintf(" %s\n", f->f_un.f_forw.f_hname); 940 /* check for local vs remote messages */ 941 if (strcasecmp(f->f_prevhost, LocalHostName)) 942 l = snprintf(line, sizeof line - 1, 943 "<%d>%.15s Forwarded from %s: %s", 944 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 945 iov[5].iov_base); 946 else 947 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 948 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 949 if (l > MAXLINE) 950 l = MAXLINE; 951 if ((finet >= 0) && 952 (sendto(finet, line, l, 0, 953 (struct sockaddr *)&f->f_un.f_forw.f_addr, 954 sizeof(f->f_un.f_forw.f_addr)) != l)) { 955 int e = errno; 956 (void)close(f->f_file); 957 f->f_type = F_UNUSED; 958 errno = e; 959 logerror("sendto"); 960 } 961 break; 962 963 case F_FILE: 964 dprintf(" %s\n", f->f_un.f_fname); 965 v->iov_base = "\n"; 966 v->iov_len = 1; 967 if (writev(f->f_file, iov, 7) < 0) { 968 int e = errno; 969 (void)close(f->f_file); 970 f->f_type = F_UNUSED; 971 errno = e; 972 logerror(f->f_un.f_fname); 973 } else if (flags & SYNC_FILE) 974 (void)fsync(f->f_file); 975 break; 976 977 case F_PIPE: 978 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 979 v->iov_base = "\n"; 980 v->iov_len = 1; 981 if (f->f_un.f_pipe.f_pid == 0) { 982 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 983 &f->f_un.f_pipe.f_pid)) < 0) { 984 f->f_type = F_UNUSED; 985 logerror(f->f_un.f_pipe.f_pname); 986 break; 987 } 988 } 989 if (writev(f->f_file, iov, 7) < 0) { 990 int e = errno; 991 (void)close(f->f_file); 992 if (f->f_un.f_pipe.f_pid > 0) 993 deadq_enter(f->f_un.f_pipe.f_pid, 994 f->f_un.f_pipe.f_pname); 995 f->f_un.f_pipe.f_pid = 0; 996 errno = e; 997 logerror(f->f_un.f_pipe.f_pname); 998 } 999 break; 1000 1001 case F_CONSOLE: 1002 if (flags & IGN_CONS) { 1003 dprintf(" (ignored)\n"); 1004 break; 1005 } 1006 /* FALLTHROUGH */ 1007 1008 case F_TTY: 1009 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1010 v->iov_base = "\r\n"; 1011 v->iov_len = 2; 1012 1013 errno = 0; /* ttymsg() only sometimes returns an errno */ 1014 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1015 f->f_type = F_UNUSED; 1016 logerror(msgret); 1017 } 1018 break; 1019 1020 case F_USERS: 1021 case F_WALL: 1022 dprintf("\n"); 1023 v->iov_base = "\r\n"; 1024 v->iov_len = 2; 1025 wallmsg(f, iov); 1026 break; 1027 } 1028 f->f_prevcount = 0; 1029 } 1030 1031 /* 1032 * WALLMSG -- Write a message to the world at large 1033 * 1034 * Write the specified message to either the entire 1035 * world, or a list of approved users. 1036 */ 1037 void 1038 wallmsg(f, iov) 1039 struct filed *f; 1040 struct iovec *iov; 1041 { 1042 static int reenter; /* avoid calling ourselves */ 1043 FILE *uf; 1044 struct utmp ut; 1045 int i; 1046 char *p; 1047 char line[sizeof(ut.ut_line) + 1]; 1048 1049 if (reenter++) 1050 return; 1051 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1052 logerror(_PATH_UTMP); 1053 reenter = 0; 1054 return; 1055 } 1056 /* NOSTRICT */ 1057 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1058 if (ut.ut_name[0] == '\0') 1059 continue; 1060 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 1061 line[sizeof(ut.ut_line)] = '\0'; 1062 if (f->f_type == F_WALL) { 1063 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1064 errno = 0; /* already in msg */ 1065 logerror(p); 1066 } 1067 continue; 1068 } 1069 /* should we send the message to this user? */ 1070 for (i = 0; i < MAXUNAMES; i++) { 1071 if (!f->f_un.f_uname[i][0]) 1072 break; 1073 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1074 UT_NAMESIZE)) { 1075 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1076 != NULL) { 1077 errno = 0; /* already in msg */ 1078 logerror(p); 1079 } 1080 break; 1081 } 1082 } 1083 } 1084 (void)fclose(uf); 1085 reenter = 0; 1086 } 1087 1088 void 1089 reapchild(signo) 1090 int signo; 1091 { 1092 int status; 1093 pid_t pid; 1094 struct filed *f; 1095 1096 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1097 if (!Initialized) 1098 /* Don't tell while we are initting. */ 1099 continue; 1100 1101 /* First, look if it's a process from the dead queue. */ 1102 if (deadq_remove(pid)) 1103 goto oncemore; 1104 1105 /* Now, look in list of active processes. */ 1106 for (f = Files; f; f = f->f_next) 1107 if (f->f_type == F_PIPE && 1108 f->f_un.f_pipe.f_pid == pid) { 1109 (void)close(f->f_file); 1110 f->f_un.f_pipe.f_pid = 0; 1111 log_deadchild(pid, status, 1112 f->f_un.f_pipe.f_pname); 1113 break; 1114 } 1115 oncemore: 1116 continue; 1117 } 1118 } 1119 1120 /* 1121 * Return a printable representation of a host address. 1122 */ 1123 char * 1124 cvthname(f) 1125 struct sockaddr_in *f; 1126 { 1127 struct hostent *hp; 1128 sigset_t omask, nmask; 1129 char *p; 1130 1131 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1132 1133 if (f->sin_family != AF_INET) { 1134 dprintf("Malformed from address\n"); 1135 return ("???"); 1136 } 1137 sigemptyset(&nmask); 1138 sigaddset(&nmask, SIGHUP); 1139 sigprocmask(SIG_BLOCK, &nmask, &omask); 1140 hp = gethostbyaddr((char *)&f->sin_addr, 1141 sizeof(struct in_addr), f->sin_family); 1142 sigprocmask(SIG_SETMASK, &omask, NULL); 1143 if (hp == 0) { 1144 dprintf("Host name for your address (%s) unknown\n", 1145 inet_ntoa(f->sin_addr)); 1146 return (inet_ntoa(f->sin_addr)); 1147 } 1148 if ((p = strchr(hp->h_name, '.')) && 1149 strcasecmp(p + 1, LocalDomain) == 0) 1150 *p = '\0'; 1151 return (hp->h_name); 1152 } 1153 1154 void 1155 domark(signo) 1156 int signo; 1157 { 1158 struct filed *f; 1159 dq_t q; 1160 1161 now = time((time_t *)NULL); 1162 MarkSeq += TIMERINTVL; 1163 if (MarkSeq >= MarkInterval) { 1164 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1165 MarkSeq = 0; 1166 } 1167 1168 for (f = Files; f; f = f->f_next) { 1169 if (f->f_prevcount && now >= REPEATTIME(f)) { 1170 dprintf("flush %s: repeated %d times, %d sec.\n", 1171 TypeNames[f->f_type], f->f_prevcount, 1172 repeatinterval[f->f_repeatcount]); 1173 fprintlog(f, 0, (char *)NULL); 1174 BACKOFF(f); 1175 } 1176 } 1177 1178 /* Walk the dead queue, and see if we should signal somebody. */ 1179 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1180 switch (q->dq_timeout) { 1181 case 0: 1182 /* Already signalled once, try harder now. */ 1183 if (kill(q->dq_pid, SIGKILL) != 0) 1184 (void)deadq_remove(q->dq_pid); 1185 break; 1186 1187 case 1: 1188 /* 1189 * Timed out on dead queue, send terminate 1190 * signal. Note that we leave the removal 1191 * from the dead queue to reapchild(), which 1192 * will also log the event (unless the process 1193 * didn't even really exist, in case we simply 1194 * drop it from the dead queue). 1195 */ 1196 if (kill(q->dq_pid, SIGTERM) != 0) 1197 (void)deadq_remove(q->dq_pid); 1198 /* FALLTHROUGH */ 1199 1200 default: 1201 q->dq_timeout--; 1202 } 1203 1204 (void)alarm(TIMERINTVL); 1205 } 1206 1207 /* 1208 * Print syslogd errors some place. 1209 */ 1210 void 1211 logerror(type) 1212 const char *type; 1213 { 1214 char buf[512]; 1215 1216 if (errno) 1217 (void)snprintf(buf, 1218 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1219 else 1220 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1221 errno = 0; 1222 dprintf("%s\n", buf); 1223 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1224 } 1225 1226 void 1227 die(signo) 1228 int signo; 1229 { 1230 struct filed *f; 1231 int was_initialized; 1232 char buf[100]; 1233 int i; 1234 1235 was_initialized = Initialized; 1236 Initialized = 0; /* Don't log SIGCHLDs. */ 1237 for (f = Files; f != NULL; f = f->f_next) { 1238 /* flush any pending output */ 1239 if (f->f_prevcount) 1240 fprintlog(f, 0, (char *)NULL); 1241 if (f->f_type == F_PIPE) 1242 (void)close(f->f_file); 1243 } 1244 Initialized = was_initialized; 1245 if (signo) { 1246 dprintf("syslogd: exiting on signal %d\n", signo); 1247 (void)sprintf(buf, "exiting on signal %d", signo); 1248 errno = 0; 1249 logerror(buf); 1250 } 1251 for (i = 0; i < nfunix; i++) 1252 if (funixn[i] && funix[i] != -1) 1253 (void)unlink(funixn[i]); 1254 exit(1); 1255 } 1256 1257 /* 1258 * INIT -- Initialize syslogd from configuration table 1259 */ 1260 void 1261 init(signo) 1262 int signo; 1263 { 1264 int i; 1265 FILE *cf; 1266 struct filed *f, *next, **nextp; 1267 char *p; 1268 char cline[LINE_MAX]; 1269 char prog[NAME_MAX+1]; 1270 char host[MAXHOSTNAMELEN+1]; 1271 1272 dprintf("init\n"); 1273 1274 /* 1275 * Close all open log files. 1276 */ 1277 Initialized = 0; 1278 for (f = Files; f != NULL; f = next) { 1279 /* flush any pending output */ 1280 if (f->f_prevcount) 1281 fprintlog(f, 0, (char *)NULL); 1282 1283 switch (f->f_type) { 1284 case F_FILE: 1285 case F_FORW: 1286 case F_CONSOLE: 1287 case F_TTY: 1288 (void)close(f->f_file); 1289 break; 1290 case F_PIPE: 1291 (void)close(f->f_file); 1292 if (f->f_un.f_pipe.f_pid > 0) 1293 deadq_enter(f->f_un.f_pipe.f_pid, 1294 f->f_un.f_pipe.f_pname); 1295 f->f_un.f_pipe.f_pid = 0; 1296 break; 1297 } 1298 next = f->f_next; 1299 if (f->f_program) free(f->f_program); 1300 if (f->f_host) free(f->f_host); 1301 free((char *)f); 1302 } 1303 Files = NULL; 1304 nextp = &Files; 1305 1306 /* open the configuration file */ 1307 if ((cf = fopen(ConfFile, "r")) == NULL) { 1308 dprintf("cannot open %s\n", ConfFile); 1309 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1310 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1311 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1312 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1313 Initialized = 1; 1314 return; 1315 } 1316 1317 /* 1318 * Foreach line in the conf table, open that file. 1319 */ 1320 f = NULL; 1321 strcpy(host, "*"); 1322 strcpy(prog, "*"); 1323 while (fgets(cline, sizeof(cline), cf) != NULL) { 1324 /* 1325 * check for end-of-section, comments, strip off trailing 1326 * spaces and newline character. #!prog is treated specially: 1327 * following lines apply only to that program. 1328 */ 1329 for (p = cline; isspace(*p); ++p) 1330 continue; 1331 if (*p == 0) 1332 continue; 1333 if (*p == '#') { 1334 p++; 1335 if (*p != '!' && *p != '+' && *p != '-') 1336 continue; 1337 } 1338 if (*p == '+' || *p == '-') { 1339 host[0] = *p++; 1340 while (isspace(*p)) p++; 1341 if ((!*p) || (*p == '*')) { 1342 strcpy(host, "*"); 1343 continue; 1344 } 1345 if (*p == '@') 1346 p = LocalHostName; 1347 for (i = 1; i < MAXHOSTNAMELEN; i++) { 1348 if (!isalnum(*p) && *p != '.' && *p != '-') 1349 break; 1350 host[i] = *p++; 1351 } 1352 host[i] = '\0'; 1353 continue; 1354 } 1355 if (*p == '!') { 1356 p++; 1357 while (isspace(*p)) p++; 1358 if ((!*p) || (*p == '*')) { 1359 strcpy(prog, "*"); 1360 continue; 1361 } 1362 for (i = 0; i < NAME_MAX; i++) { 1363 if (!isalnum(p[i])) 1364 break; 1365 prog[i] = p[i]; 1366 } 1367 prog[i] = 0; 1368 continue; 1369 } 1370 for (p = strchr(cline, '\0'); isspace(*--p);) 1371 continue; 1372 *++p = '\0'; 1373 f = (struct filed *)calloc(1, sizeof(*f)); 1374 *nextp = f; 1375 nextp = &f->f_next; 1376 cfline(cline, f, prog, host); 1377 } 1378 1379 /* close the configuration file */ 1380 (void)fclose(cf); 1381 1382 Initialized = 1; 1383 1384 if (Debug) { 1385 for (f = Files; f; f = f->f_next) { 1386 for (i = 0; i <= LOG_NFACILITIES; i++) 1387 if (f->f_pmask[i] == INTERNAL_NOPRI) 1388 printf("X "); 1389 else 1390 printf("%d ", f->f_pmask[i]); 1391 printf("%s: ", TypeNames[f->f_type]); 1392 switch (f->f_type) { 1393 case F_FILE: 1394 printf("%s", f->f_un.f_fname); 1395 break; 1396 1397 case F_CONSOLE: 1398 case F_TTY: 1399 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1400 break; 1401 1402 case F_FORW: 1403 printf("%s", f->f_un.f_forw.f_hname); 1404 break; 1405 1406 case F_PIPE: 1407 printf("%s", f->f_un.f_pipe.f_pname); 1408 break; 1409 1410 case F_USERS: 1411 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1412 printf("%s, ", f->f_un.f_uname[i]); 1413 break; 1414 } 1415 if (f->f_program) 1416 printf(" (%s)", f->f_program); 1417 printf("\n"); 1418 } 1419 } 1420 1421 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1422 dprintf("syslogd: restarted\n"); 1423 } 1424 1425 /* 1426 * Crack a configuration file line 1427 */ 1428 void 1429 cfline(line, f, prog, host) 1430 char *line; 1431 struct filed *f; 1432 char *prog; 1433 char *host; 1434 { 1435 struct hostent *hp; 1436 int i, pri; 1437 char *bp, *p, *q; 1438 char buf[MAXLINE], ebuf[100]; 1439 1440 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1441 1442 errno = 0; /* keep strerror() stuff out of logerror messages */ 1443 1444 /* clear out file entry */ 1445 memset(f, 0, sizeof(*f)); 1446 for (i = 0; i <= LOG_NFACILITIES; i++) 1447 f->f_pmask[i] = INTERNAL_NOPRI; 1448 1449 /* save hostname if any */ 1450 if (host && *host == '*') 1451 host = NULL; 1452 if (host) 1453 f->f_host = strdup(host); 1454 1455 /* save program name if any */ 1456 if (prog && *prog == '*') 1457 prog = NULL; 1458 if (prog) 1459 f->f_program = strdup(prog); 1460 1461 /* scan through the list of selectors */ 1462 for (p = line; *p && *p != '\t' && *p != ' ';) { 1463 int pri_done; 1464 int pri_cmp; 1465 1466 /* find the end of this facility name list */ 1467 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1468 continue; 1469 1470 /* get the priority comparison */ 1471 pri_cmp = 0; 1472 pri_done = 0; 1473 while (!pri_done) { 1474 switch (*q) { 1475 case '<': 1476 pri_cmp |= PRI_LT; 1477 q++; 1478 break; 1479 case '=': 1480 pri_cmp |= PRI_EQ; 1481 q++; 1482 break; 1483 case '>': 1484 pri_cmp |= PRI_GT; 1485 q++; 1486 break; 1487 default: 1488 pri_done++; 1489 break; 1490 } 1491 } 1492 if (!pri_cmp) 1493 pri_cmp = (UniquePriority) 1494 ? (PRI_EQ) 1495 : (PRI_EQ | PRI_GT) 1496 ; 1497 1498 /* collect priority name */ 1499 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1500 *bp++ = *q++; 1501 *bp = '\0'; 1502 1503 /* skip cruft */ 1504 while (strchr(",;", *q)) 1505 q++; 1506 1507 /* decode priority name */ 1508 if (*buf == '*') 1509 pri = LOG_PRIMASK + 1; 1510 else { 1511 pri = decode(buf, prioritynames); 1512 if (pri < 0) { 1513 (void)snprintf(ebuf, sizeof ebuf, 1514 "unknown priority name \"%s\"", buf); 1515 logerror(ebuf); 1516 return; 1517 } 1518 } 1519 1520 /* scan facilities */ 1521 while (*p && !strchr("\t.; ", *p)) { 1522 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1523 *bp++ = *p++; 1524 *bp = '\0'; 1525 1526 if (*buf == '*') 1527 for (i = 0; i < LOG_NFACILITIES; i++) { 1528 f->f_pmask[i] = pri; 1529 f->f_pcmp[i] = pri_cmp; 1530 } 1531 else { 1532 i = decode(buf, facilitynames); 1533 if (i < 0) { 1534 (void)snprintf(ebuf, sizeof ebuf, 1535 "unknown facility name \"%s\"", 1536 buf); 1537 logerror(ebuf); 1538 return; 1539 } 1540 f->f_pmask[i >> 3] = pri; 1541 f->f_pcmp[i >> 3] = pri_cmp; 1542 } 1543 while (*p == ',' || *p == ' ') 1544 p++; 1545 } 1546 1547 p = q; 1548 } 1549 1550 /* skip to action part */ 1551 while (*p == '\t' || *p == ' ') 1552 p++; 1553 1554 switch (*p) 1555 { 1556 case '@': 1557 (void)strncpy(f->f_un.f_forw.f_hname, ++p, 1558 sizeof(f->f_un.f_forw.f_hname)-1); 1559 f->f_un.f_forw.f_hname[sizeof(f->f_un.f_forw.f_hname)-1] = '\0'; 1560 hp = gethostbyname(f->f_un.f_forw.f_hname); 1561 if (hp == NULL) { 1562 1563 logerror(hstrerror(h_errno)); 1564 break; 1565 } 1566 memset(&f->f_un.f_forw.f_addr, 0, 1567 sizeof(f->f_un.f_forw.f_addr)); 1568 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1569 f->f_un.f_forw.f_addr.sin_port = LogPort; 1570 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1571 f->f_type = F_FORW; 1572 break; 1573 1574 case '/': 1575 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1576 f->f_type = F_UNUSED; 1577 logerror(p); 1578 break; 1579 } 1580 if (isatty(f->f_file)) { 1581 if (strcmp(p, ctty) == 0) 1582 f->f_type = F_CONSOLE; 1583 else 1584 f->f_type = F_TTY; 1585 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1586 } else { 1587 (void)strcpy(f->f_un.f_fname, p); 1588 f->f_type = F_FILE; 1589 } 1590 break; 1591 1592 case '|': 1593 f->f_un.f_pipe.f_pid = 0; 1594 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1595 f->f_type = F_PIPE; 1596 break; 1597 1598 case '*': 1599 f->f_type = F_WALL; 1600 break; 1601 1602 default: 1603 for (i = 0; i < MAXUNAMES && *p; i++) { 1604 for (q = p; *q && *q != ','; ) 1605 q++; 1606 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1607 if ((q - p) > UT_NAMESIZE) 1608 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1609 else 1610 f->f_un.f_uname[i][q - p] = '\0'; 1611 while (*q == ',' || *q == ' ') 1612 q++; 1613 p = q; 1614 } 1615 f->f_type = F_USERS; 1616 break; 1617 } 1618 } 1619 1620 1621 /* 1622 * Decode a symbolic name to a numeric value 1623 */ 1624 int 1625 decode(name, codetab) 1626 const char *name; 1627 CODE *codetab; 1628 { 1629 CODE *c; 1630 char *p, buf[40]; 1631 1632 if (isdigit(*name)) 1633 return (atoi(name)); 1634 1635 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1636 if (isupper(*name)) 1637 *p = tolower(*name); 1638 else 1639 *p = *name; 1640 } 1641 *p = '\0'; 1642 for (c = codetab; c->c_name; c++) 1643 if (!strcmp(buf, c->c_name)) 1644 return (c->c_val); 1645 1646 return (-1); 1647 } 1648 1649 /* 1650 * fork off and become a daemon, but wait for the child to come online 1651 * before returing to the parent, or we get disk thrashing at boot etc. 1652 * Set a timer so we don't hang forever if it wedges. 1653 */ 1654 int 1655 waitdaemon(nochdir, noclose, maxwait) 1656 int nochdir, noclose, maxwait; 1657 { 1658 int fd; 1659 int status; 1660 pid_t pid, childpid; 1661 1662 switch (childpid = fork()) { 1663 case -1: 1664 return (-1); 1665 case 0: 1666 break; 1667 default: 1668 signal(SIGALRM, timedout); 1669 alarm(maxwait); 1670 while ((pid = wait3(&status, 0, NULL)) != -1) { 1671 if (WIFEXITED(status)) 1672 errx(1, "child pid %d exited with return code %d", 1673 pid, WEXITSTATUS(status)); 1674 if (WIFSIGNALED(status)) 1675 errx(1, "child pid %d exited on signal %d%s", 1676 pid, WTERMSIG(status), 1677 WCOREDUMP(status) ? " (core dumped)" : 1678 ""); 1679 if (pid == childpid) /* it's gone... */ 1680 break; 1681 } 1682 exit(0); 1683 } 1684 1685 if (setsid() == -1) 1686 return (-1); 1687 1688 if (!nochdir) 1689 (void)chdir("/"); 1690 1691 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1692 (void)dup2(fd, STDIN_FILENO); 1693 (void)dup2(fd, STDOUT_FILENO); 1694 (void)dup2(fd, STDERR_FILENO); 1695 if (fd > 2) 1696 (void)close (fd); 1697 } 1698 return (getppid()); 1699 } 1700 1701 /* 1702 * We get a SIGALRM from the child when it's running and finished doing it's 1703 * fsync()'s or O_SYNC writes for all the boot messages. 1704 * 1705 * We also get a signal from the kernel if the timer expires, so check to 1706 * see what happened. 1707 */ 1708 void 1709 timedout(sig) 1710 int sig __unused; 1711 { 1712 int left; 1713 left = alarm(0); 1714 signal(SIGALRM, SIG_DFL); 1715 if (left == 0) 1716 errx(1, "timed out waiting for child"); 1717 else 1718 exit(0); 1719 } 1720 1721 /* 1722 * Add `s' to the list of allowable peer addresses to accept messages 1723 * from. 1724 * 1725 * `s' is a string in the form: 1726 * 1727 * [*]domainname[:{servicename|portnumber|*}] 1728 * 1729 * or 1730 * 1731 * netaddr/maskbits[:{servicename|portnumber|*}] 1732 * 1733 * Returns -1 on error, 0 if the argument was valid. 1734 */ 1735 int 1736 allowaddr(s) 1737 char *s; 1738 { 1739 char *cp1, *cp2; 1740 struct allowedpeer ap; 1741 struct servent *se; 1742 regex_t re; 1743 int i; 1744 1745 if ((cp1 = strrchr(s, ':'))) { 1746 /* service/port provided */ 1747 *cp1++ = '\0'; 1748 if (strlen(cp1) == 1 && *cp1 == '*') 1749 /* any port allowed */ 1750 ap.port = htons(0); 1751 else if ((se = getservbyname(cp1, "udp"))) 1752 ap.port = se->s_port; 1753 else { 1754 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1755 if (*cp2 != '\0') 1756 return -1; /* port not numeric */ 1757 } 1758 } else { 1759 if ((se = getservbyname("syslog", "udp"))) 1760 ap.port = se->s_port; 1761 else 1762 /* sanity, should not happen */ 1763 ap.port = htons(514); 1764 } 1765 1766 /* the regexp's are ugly, but the cleanest way */ 1767 1768 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1769 REG_EXTENDED)) 1770 /* if RE compilation fails, that's an internal error */ 1771 abort(); 1772 if (regexec(&re, s, 0, 0, 0) == 0) { 1773 /* arg `s' is numeric */ 1774 ap.isnumeric = 1; 1775 if ((cp1 = strchr(s, '/')) != NULL) { 1776 *cp1++ = '\0'; 1777 i = atoi(cp1); 1778 if (i < 0 || i > 32) 1779 return -1; 1780 /* convert masklen to netmask */ 1781 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1782 } 1783 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1784 return -1; 1785 if (cp1 == NULL) { 1786 /* use default netmask */ 1787 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1788 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1789 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1790 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1791 else 1792 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1793 } 1794 } else { 1795 /* arg `s' is domain name */ 1796 ap.isnumeric = 0; 1797 ap.a_name = s; 1798 } 1799 regfree(&re); 1800 1801 if (Debug) { 1802 printf("allowaddr: rule %d: ", NumAllowed); 1803 if (ap.isnumeric) { 1804 printf("numeric, "); 1805 printf("addr = %s, ", 1806 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1807 printf("mask = %s; ", 1808 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1809 } else 1810 printf("domainname = %s; ", ap.a_name); 1811 printf("port = %d\n", ntohs(ap.port)); 1812 } 1813 1814 if ((AllowedPeers = realloc(AllowedPeers, 1815 ++NumAllowed * sizeof(struct allowedpeer))) 1816 == NULL) { 1817 fprintf(stderr, "Out of memory!\n"); 1818 exit(EX_OSERR); 1819 } 1820 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1821 return 0; 1822 } 1823 1824 /* 1825 * Validate that the remote peer has permission to log to us. 1826 */ 1827 int 1828 validate(sin, hname) 1829 struct sockaddr_in *sin; 1830 const char *hname; 1831 { 1832 int i; 1833 size_t l1, l2; 1834 char *cp, name[MAXHOSTNAMELEN]; 1835 struct allowedpeer *ap; 1836 1837 if (NumAllowed == 0) 1838 /* traditional behaviour, allow everything */ 1839 return 1; 1840 1841 strlcpy(name, hname, sizeof name); 1842 if (strchr(name, '.') == NULL) { 1843 strlcat(name, ".", sizeof name); 1844 strlcat(name, LocalDomain, sizeof name); 1845 } 1846 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1847 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1848 ntohs(sin->sin_port), name); 1849 1850 /* now, walk down the list */ 1851 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1852 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1853 dprintf("rejected in rule %d due to port mismatch.\n", i); 1854 continue; 1855 } 1856 1857 if (ap->isnumeric) { 1858 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1859 != ap->a_addr.s_addr) { 1860 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1861 continue; 1862 } 1863 } else { 1864 cp = ap->a_name; 1865 l1 = strlen(name); 1866 if (*cp == '*') { 1867 /* allow wildmatch */ 1868 cp++; 1869 l2 = strlen(cp); 1870 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1871 dprintf("rejected in rule %d due to name mismatch.\n", i); 1872 continue; 1873 } 1874 } else { 1875 /* exact match */ 1876 l2 = strlen(cp); 1877 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1878 dprintf("rejected in rule %d due to name mismatch.\n", i); 1879 continue; 1880 } 1881 } 1882 } 1883 dprintf("accepted in rule %d.\n", i); 1884 return 1; /* hooray! */ 1885 } 1886 return 0; 1887 } 1888 1889 /* 1890 * Fairly similar to popen(3), but returns an open descriptor, as 1891 * opposed to a FILE *. 1892 */ 1893 int 1894 p_open(prog, pid) 1895 char *prog; 1896 pid_t *pid; 1897 { 1898 int pfd[2], nulldesc, i; 1899 sigset_t omask, mask; 1900 char *argv[4]; /* sh -c cmd NULL */ 1901 char errmsg[200]; 1902 1903 if (pipe(pfd) == -1) 1904 return -1; 1905 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1906 /* we are royally screwed anyway */ 1907 return -1; 1908 1909 sigemptyset(&mask); 1910 sigaddset(&mask, SIGALRM); 1911 sigaddset(&mask, SIGHUP); 1912 sigprocmask(SIG_BLOCK, &mask, &omask); 1913 switch ((*pid = fork())) { 1914 case -1: 1915 sigprocmask(SIG_SETMASK, &omask, 0); 1916 close(nulldesc); 1917 return -1; 1918 1919 case 0: 1920 argv[0] = "sh"; 1921 argv[1] = "-c"; 1922 argv[2] = prog; 1923 argv[3] = NULL; 1924 1925 alarm(0); 1926 (void)setsid(); /* Avoid catching SIGHUPs. */ 1927 1928 /* 1929 * Throw away pending signals, and reset signal 1930 * behaviour to standard values. 1931 */ 1932 signal(SIGALRM, SIG_IGN); 1933 signal(SIGHUP, SIG_IGN); 1934 sigprocmask(SIG_SETMASK, &omask, 0); 1935 signal(SIGPIPE, SIG_DFL); 1936 signal(SIGQUIT, SIG_DFL); 1937 signal(SIGALRM, SIG_DFL); 1938 signal(SIGHUP, SIG_DFL); 1939 1940 dup2(pfd[0], STDIN_FILENO); 1941 dup2(nulldesc, STDOUT_FILENO); 1942 dup2(nulldesc, STDERR_FILENO); 1943 for (i = getdtablesize(); i > 2; i--) 1944 (void) close(i); 1945 1946 (void) execvp(_PATH_BSHELL, argv); 1947 _exit(255); 1948 } 1949 1950 sigprocmask(SIG_SETMASK, &omask, 0); 1951 close(nulldesc); 1952 close(pfd[0]); 1953 /* 1954 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1955 * supposed to get an EWOULDBLOCK on writev(2), which is 1956 * caught by the logic above anyway, which will in turn close 1957 * the pipe, and fork a new logging subprocess if necessary. 1958 * The stale subprocess will be killed some time later unless 1959 * it terminated itself due to closing its input pipe (so we 1960 * get rid of really dead puppies). 1961 */ 1962 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1963 /* This is bad. */ 1964 (void)snprintf(errmsg, sizeof errmsg, 1965 "Warning: cannot change pipe to PID %d to " 1966 "non-blocking behaviour.", 1967 (int)*pid); 1968 logerror(errmsg); 1969 } 1970 return pfd[1]; 1971 } 1972 1973 void 1974 deadq_enter(pid, name) 1975 pid_t pid; 1976 const char *name; 1977 { 1978 dq_t p; 1979 int status; 1980 1981 /* 1982 * Be paranoid, if we can't signal the process, don't enter it 1983 * into the dead queue (perhaps it's already dead). If possible, 1984 * we try to fetch and log the child's status. 1985 */ 1986 if (kill(pid, 0) != 0) { 1987 if (waitpid(pid, &status, WNOHANG) > 0) 1988 log_deadchild(pid, status, name); 1989 return; 1990 } 1991 1992 p = malloc(sizeof(struct deadq_entry)); 1993 if (p == 0) { 1994 errno = 0; 1995 logerror("panic: out of virtual memory!"); 1996 exit(1); 1997 } 1998 1999 p->dq_pid = pid; 2000 p->dq_timeout = DQ_TIMO_INIT; 2001 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2002 } 2003 2004 int 2005 deadq_remove(pid) 2006 pid_t pid; 2007 { 2008 dq_t q; 2009 2010 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 2011 if (q->dq_pid == pid) { 2012 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2013 free(q); 2014 return 1; 2015 } 2016 2017 return 0; 2018 } 2019 2020 void 2021 log_deadchild(pid, status, name) 2022 pid_t pid; 2023 int status; 2024 const char *name; 2025 { 2026 int code; 2027 char buf[256]; 2028 const char *reason; 2029 2030 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2031 if (WIFSIGNALED(status)) { 2032 reason = "due to signal"; 2033 code = WTERMSIG(status); 2034 } else { 2035 reason = "with status"; 2036 code = WEXITSTATUS(status); 2037 if (code == 0) 2038 return; 2039 } 2040 (void)snprintf(buf, sizeof buf, 2041 "Logging subprocess %d (%s) exited %s %d.", 2042 pid, name, reason, code); 2043 logerror(buf); 2044 } 2045