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 "$Id: syslogd.c,v 1.42 1998/11/05 10:51:21 dg Exp $"; 46 #endif /* not lint */ 47 48 /* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximimum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 * Extension to log by program name as well as facility and priority 69 * by Peter da Silva. 70 * -u and -v by Harlan Stenn. 71 * Priority comparison code by Harlan Stenn. 72 */ 73 74 #define MAXLINE 1024 /* maximum line length */ 75 #define MAXSVLINE 120 /* maximum saved line length */ 76 #define DEFUPRI (LOG_USER|LOG_NOTICE) 77 #define DEFSPRI (LOG_KERN|LOG_CRIT) 78 #define TIMERINTVL 30 /* interval for checking flush, mark */ 79 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/stat.h> 84 #include <sys/wait.h> 85 #include <sys/socket.h> 86 #include <sys/queue.h> 87 #include <sys/uio.h> 88 #include <sys/un.h> 89 #include <sys/time.h> 90 #include <sys/resource.h> 91 #include <sys/syslimits.h> 92 #include <paths.h> 93 94 #include <netinet/in.h> 95 #include <netdb.h> 96 #include <arpa/inet.h> 97 98 #include <ctype.h> 99 #include <err.h> 100 #include <errno.h> 101 #include <fcntl.h> 102 #include <regex.h> 103 #include <setjmp.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmp.h> 111 #include "pathnames.h" 112 113 #define SYSLOG_NAMES 114 #include <sys/syslog.h> 115 116 const char *ConfFile = _PATH_LOGCONF; 117 const char *PidFile = _PATH_LOGPID; 118 const char ctty[] = _PATH_CONSOLE; 119 120 #define dprintf if (Debug) printf 121 122 #define MAXUNAMES 20 /* maximum number of user names */ 123 124 #define MAXFUNIX 20 125 126 int nfunix = 1; 127 char *funixn[MAXFUNIX] = { _PATH_LOG }; 128 int funix[MAXFUNIX]; 129 130 /* 131 * Flags to logmsg(). 132 */ 133 134 #define IGN_CONS 0x001 /* don't print on console */ 135 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 136 #define ADDDATE 0x004 /* add a date to the message */ 137 #define MARK 0x008 /* this message is a mark */ 138 #define ISKERNEL 0x010 /* kernel generated message */ 139 140 /* 141 * This structure represents the files that will have log 142 * copies printed. 143 */ 144 145 struct filed { 146 struct filed *f_next; /* next in linked list */ 147 short f_type; /* entry type, see below */ 148 short f_file; /* file descriptor */ 149 time_t f_time; /* time this was last written */ 150 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 151 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 152 #define PRI_LT 0x1 153 #define PRI_EQ 0x2 154 #define PRI_GT 0x4 155 char *f_program; /* program this applies to */ 156 union { 157 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 158 struct { 159 char f_hname[MAXHOSTNAMELEN+1]; 160 struct sockaddr_in f_addr; 161 } f_forw; /* forwarding address */ 162 char f_fname[MAXPATHLEN]; 163 struct { 164 char f_pname[MAXPATHLEN]; 165 pid_t f_pid; 166 } f_pipe; 167 } f_un; 168 char f_prevline[MAXSVLINE]; /* last message logged */ 169 char f_lasttime[16]; /* time of last occurrence */ 170 char f_prevhost[MAXHOSTNAMELEN+1]; /* host from which recd. */ 171 int f_prevpri; /* pri of f_prevline */ 172 int f_prevlen; /* length of f_prevline */ 173 int f_prevcount; /* repetition cnt of prevline */ 174 int f_repeatcount; /* number of "repeated" msgs */ 175 }; 176 177 /* 178 * Queue of about-to-be dead processes we should watch out for. 179 */ 180 181 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 182 struct stailhead *deadq_headp; 183 184 struct deadq_entry { 185 pid_t dq_pid; 186 int dq_timeout; 187 TAILQ_ENTRY(deadq_entry) dq_entries; 188 }; 189 190 /* 191 * The timeout to apply to processes waiting on the dead queue. Unit 192 * of measure is `mark intervals', i.e. 20 minutes by default. 193 * Processes on the dead queue will be terminated after that time. 194 */ 195 196 #define DQ_TIMO_INIT 2 197 198 typedef struct deadq_entry *dq_t; 199 200 201 /* 202 * Struct to hold records of network addresses that are allowed to log 203 * to us. 204 */ 205 struct allowedpeer { 206 int isnumeric; 207 u_short port; 208 union { 209 struct { 210 struct in_addr addr; 211 struct in_addr mask; 212 } numeric; 213 char *name; 214 } u; 215 #define a_addr u.numeric.addr 216 #define a_mask u.numeric.mask 217 #define a_name u.name 218 }; 219 220 221 /* 222 * Intervals at which we flush out "message repeated" messages, 223 * in seconds after previous message is logged. After each flush, 224 * we move to the next interval until we reach the largest. 225 */ 226 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 227 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 228 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 229 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 230 (f)->f_repeatcount = MAXREPEAT; \ 231 } 232 233 /* values for f_type */ 234 #define F_UNUSED 0 /* unused entry */ 235 #define F_FILE 1 /* regular file */ 236 #define F_TTY 2 /* terminal */ 237 #define F_CONSOLE 3 /* console terminal */ 238 #define F_FORW 4 /* remote machine */ 239 #define F_USERS 5 /* list of users */ 240 #define F_WALL 6 /* everyone logged on */ 241 #define F_PIPE 7 /* pipe to program */ 242 243 char *TypeNames[8] = { 244 "UNUSED", "FILE", "TTY", "CONSOLE", 245 "FORW", "USERS", "WALL", "PIPE" 246 }; 247 248 struct filed *Files; 249 struct filed consfile; 250 251 int Debug; /* debug flag */ 252 char LocalHostName[MAXHOSTNAMELEN+1]; /* our hostname */ 253 char *LocalDomain; /* our local domain name */ 254 int finet; /* Internet datagram socket */ 255 int LogPort; /* port number for INET connections */ 256 int Initialized = 0; /* set when we have initialized ourselves */ 257 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 258 int MarkSeq = 0; /* mark sequence number */ 259 int SecureMode = 0; /* when true, receive only unix domain socks */ 260 u_int Vogons = 0; /* packets arriving in SecureMode */ 261 262 char bootfile[MAXLINE+1]; /* booted kernel file */ 263 264 struct allowedpeer *AllowedPeers; 265 int NumAllowed = 0; /* # of AllowedPeer entries */ 266 267 int UniquePriority = 0; /* Only log specified priority? */ 268 int LogFacPri = 0; /* Put facility and priority in log message: */ 269 /* 0=no, 1=numeric, 2=names */ 270 271 int allowaddr __P((char *)); 272 void cfline __P((char *, struct filed *, char *)); 273 char *cvthname __P((struct sockaddr_in *)); 274 void deadq_enter __P((pid_t)); 275 int decode __P((const char *, CODE *)); 276 void die __P((int)); 277 void domark __P((int)); 278 void fprintlog __P((struct filed *, int, char *)); 279 void init __P((int)); 280 void logerror __P((const char *)); 281 void logmsg __P((int, char *, char *, int)); 282 void printline __P((char *, char *)); 283 void printsys __P((char *)); 284 int p_open __P((char *, pid_t *)); 285 void reapchild __P((int)); 286 char *ttymsg __P((struct iovec *, int, char *, int)); 287 static void usage __P((void)); 288 int validate __P((struct sockaddr_in *, const char *)); 289 void wallmsg __P((struct filed *, struct iovec *)); 290 int waitdaemon __P((int, int, int)); 291 void timedout __P((int)); 292 293 int 294 main(argc, argv) 295 int argc; 296 char *argv[]; 297 { 298 int ch, i, l, fklog, len; 299 struct sockaddr_un sunx, fromunix; 300 struct sockaddr_in sin, frominet; 301 FILE *fp; 302 char *p, *hname, line[MAXLINE + 1]; 303 struct timeval tv, *tvp; 304 pid_t ppid = 1; 305 306 while ((ch = getopt(argc, argv, "a:dl:f:m:p:suv")) != -1) 307 switch(ch) { 308 case 'd': /* debug */ 309 Debug++; 310 break; 311 case 'a': /* allow specific network addresses only */ 312 if (allowaddr(optarg) == -1) 313 usage(); 314 break; 315 case 'f': /* configuration file */ 316 ConfFile = optarg; 317 break; 318 case 'm': /* mark interval */ 319 MarkInterval = atoi(optarg) * 60; 320 break; 321 case 'p': /* path */ 322 funixn[0] = optarg; 323 break; 324 case 's': /* no network mode */ 325 SecureMode++; 326 break; 327 case 'l': 328 if (nfunix < MAXFUNIX) 329 funixn[nfunix++] = optarg; 330 else 331 fprintf(stderr, 332 "syslogd: out of descriptors, ignoring %s\n", 333 optarg); 334 break; 335 case 'u': /* only log specified priority */ 336 UniquePriority++; 337 break; 338 case 'v': /* log facility and priority */ 339 LogFacPri++; 340 break; 341 case '?': 342 default: 343 usage(); 344 } 345 if ((argc -= optind) != 0) 346 usage(); 347 348 if (!Debug) { 349 ppid = waitdaemon(0, 0, 30); 350 if (ppid < 0) 351 err(1, "could not become daemon"); 352 } else 353 setlinebuf(stdout); 354 355 if (NumAllowed) 356 endservent(); 357 358 consfile.f_type = F_CONSOLE; 359 (void)strcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1); 360 (void)gethostname(LocalHostName, sizeof(LocalHostName)); 361 if ((p = strchr(LocalHostName, '.')) != NULL) { 362 *p++ = '\0'; 363 LocalDomain = p; 364 } else 365 LocalDomain = ""; 366 (void)strcpy(bootfile, getbootfile()); 367 (void)signal(SIGTERM, die); 368 (void)signal(SIGINT, Debug ? die : SIG_IGN); 369 (void)signal(SIGQUIT, Debug ? die : SIG_IGN); 370 (void)signal(SIGCHLD, reapchild); 371 (void)signal(SIGALRM, domark); 372 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 373 (void)alarm(TIMERINTVL); 374 375 TAILQ_INIT(&deadq_head); 376 377 #ifndef SUN_LEN 378 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 379 #endif 380 for (i = 0; i < nfunix; i++) { 381 memset(&sunx, 0, sizeof(sunx)); 382 sunx.sun_family = AF_UNIX; 383 (void)strncpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 384 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 385 if (funix[i] < 0 || 386 bind(funix[i], (struct sockaddr *)&sunx, 387 SUN_LEN(&sunx)) < 0 || 388 chmod(funixn[i], 0666) < 0) { 389 (void) snprintf(line, sizeof line, 390 "cannot create %s", funixn[i]); 391 logerror(line); 392 dprintf("cannot create %s (%d)\n", funixn[i], errno); 393 if (i == 0) 394 die(0); 395 } 396 } 397 finet = socket(AF_INET, SOCK_DGRAM, 0); 398 if (finet >= 0) { 399 struct servent *sp; 400 401 sp = getservbyname("syslog", "udp"); 402 if (sp == NULL) { 403 errno = 0; 404 logerror("syslog/udp: unknown service"); 405 die(0); 406 } 407 memset(&sin, 0, sizeof(sin)); 408 sin.sin_family = AF_INET; 409 sin.sin_port = LogPort = sp->s_port; 410 411 if (bind(finet, (struct sockaddr *)&sin, sizeof(sin)) < 0) { 412 logerror("bind"); 413 if (!Debug) 414 die(0); 415 } 416 } 417 418 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) < 0) 419 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 420 421 /* tuck my process id away */ 422 fp = fopen(PidFile, "w"); 423 if (fp != NULL) { 424 fprintf(fp, "%d\n", getpid()); 425 (void) fclose(fp); 426 } 427 428 dprintf("off & running....\n"); 429 430 init(0); 431 (void)signal(SIGHUP, init); 432 433 tvp = &tv; 434 tv.tv_sec = tv.tv_usec = 0; 435 436 for (;;) { 437 fd_set readfds; 438 int nfds = 0; 439 440 FD_ZERO(&readfds); 441 if (fklog != -1) { 442 FD_SET(fklog, &readfds); 443 if (fklog > nfds) 444 nfds = fklog; 445 } 446 if (finet != -1) { 447 FD_SET(finet, &readfds); 448 if (finet > nfds) 449 nfds = finet; 450 } 451 for (i = 0; i < nfunix; i++) { 452 if (funix[i] != -1) { 453 FD_SET(funix[i], &readfds); 454 if (funix[i] > nfds) 455 nfds = funix[i]; 456 } 457 } 458 459 /*dprintf("readfds = %#x\n", readfds);*/ 460 nfds = select(nfds+1, &readfds, (fd_set *)NULL, 461 (fd_set *)NULL, tvp); 462 if (nfds == 0) { 463 if (tvp) { 464 tvp = NULL; 465 if (ppid != 1) 466 kill(ppid, SIGALRM); 467 } 468 continue; 469 } 470 if (nfds < 0) { 471 if (errno != EINTR) 472 logerror("select"); 473 continue; 474 } 475 /*dprintf("got a message (%d, %#x)\n", nfds, readfds);*/ 476 if (fklog != -1 && FD_ISSET(fklog, &readfds)) { 477 i = read(fklog, line, MAXLINE - 1); 478 if (i > 0) { 479 line[i] = '\0'; 480 printsys(line); 481 } else if (i < 0 && errno != EINTR) { 482 logerror("klog"); 483 fklog = -1; 484 } 485 } 486 if (finet != -1 && FD_ISSET(finet, &readfds)) { 487 len = sizeof(frominet); 488 l = recvfrom(finet, line, MAXLINE, 0, 489 (struct sockaddr *)&frominet, &len); 490 if (SecureMode) { 491 Vogons++; 492 if (!(Vogons & (Vogons - 1))) { 493 (void)snprintf(line, sizeof line, 494 "syslogd: discarded %d unwanted packets in secure mode, last from %s", Vogons, 495 inet_ntoa(frominet.sin_addr)); 496 logmsg(LOG_SYSLOG|LOG_AUTH, line, 497 LocalHostName, ADDDATE); 498 } 499 } else if (l > 0) { 500 line[l] = '\0'; 501 hname = cvthname(&frominet); 502 if (validate(&frominet, hname)) 503 printline(hname, line); 504 } else if (l < 0 && errno != EINTR) 505 logerror("recvfrom inet"); 506 } 507 for (i = 0; i < nfunix; i++) { 508 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 509 len = sizeof(fromunix); 510 l = recvfrom(funix[i], line, MAXLINE, 0, 511 (struct sockaddr *)&fromunix, &len); 512 if (l > 0) { 513 line[l] = '\0'; 514 printline(LocalHostName, line); 515 } else if (l < 0 && errno != EINTR) 516 logerror("recvfrom unix"); 517 } 518 } 519 } 520 } 521 522 static void 523 usage() 524 { 525 526 fprintf(stderr, "%s\n%s\n%s\n", 527 "usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]", 528 " [-m mark_interval] [-p log_socket]", 529 " [-l log_socket]"); 530 exit(1); 531 } 532 533 /* 534 * Take a raw input line, decode the message, and print the message 535 * on the appropriate log files. 536 */ 537 void 538 printline(hname, msg) 539 char *hname; 540 char *msg; 541 { 542 int c, pri; 543 char *p, *q, line[MAXLINE + 1]; 544 545 /* test for special codes */ 546 pri = DEFUPRI; 547 p = msg; 548 if (*p == '<') { 549 pri = 0; 550 while (isdigit(*++p)) 551 pri = 10 * pri + (*p - '0'); 552 if (*p == '>') 553 ++p; 554 } 555 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 556 pri = DEFUPRI; 557 558 /* don't allow users to log kernel messages */ 559 if (LOG_FAC(pri) == LOG_KERN) 560 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 561 562 q = line; 563 564 while ((c = *p++ & 0177) != '\0' && 565 q < &line[sizeof(line) - 1]) 566 if (iscntrl(c)) 567 if (c == '\n') 568 *q++ = ' '; 569 else if (c == '\t') 570 *q++ = '\t'; 571 else { 572 *q++ = '^'; 573 *q++ = c ^ 0100; 574 } 575 else 576 *q++ = c; 577 *q = '\0'; 578 579 logmsg(pri, line, hname, 0); 580 } 581 582 /* 583 * Take a raw input line from /dev/klog, split and format similar to syslog(). 584 */ 585 void 586 printsys(msg) 587 char *msg; 588 { 589 int pri, flags; 590 char *p, *q; 591 592 for (p = msg; *p != '\0'; ) { 593 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 594 pri = DEFSPRI; 595 if (*p == '<') { 596 pri = 0; 597 while (isdigit(*++p)) 598 pri = 10 * pri + (*p - '0'); 599 if (*p == '>') 600 ++p; 601 } else { 602 /* kernel printf's come out on console */ 603 flags |= IGN_CONS; 604 } 605 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 606 pri = DEFSPRI; 607 for (q = p; *q != '\0' && *q != '\n'; q++); 608 if (*q != '\0') 609 *q++ = '\0'; 610 logmsg(pri, p, LocalHostName, flags); 611 p = q; 612 } 613 } 614 615 time_t now; 616 617 /* 618 * Log a message to the appropriate log files, users, etc. based on 619 * the priority. 620 */ 621 void 622 logmsg(pri, msg, from, flags) 623 int pri; 624 char *msg, *from; 625 int flags; 626 { 627 struct filed *f; 628 int i, fac, msglen, omask, prilev; 629 char *timestamp; 630 char prog[NAME_MAX+1]; 631 char buf[MAXLINE+1]; 632 633 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 634 pri, flags, from, msg); 635 636 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 637 638 /* 639 * Check to see if msg looks non-standard. 640 */ 641 msglen = strlen(msg); 642 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 643 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 644 flags |= ADDDATE; 645 646 (void)time(&now); 647 if (flags & ADDDATE) 648 timestamp = ctime(&now) + 4; 649 else { 650 timestamp = msg; 651 msg += 16; 652 msglen -= 16; 653 } 654 655 /* skip leading blanks */ 656 while(isspace(*msg)) { 657 msg++; 658 msglen--; 659 } 660 661 /* extract facility and priority level */ 662 if (flags & MARK) 663 fac = LOG_NFACILITIES; 664 else 665 fac = LOG_FAC(pri); 666 prilev = LOG_PRI(pri); 667 668 /* extract program name */ 669 for(i = 0; i < NAME_MAX; i++) { 670 if(!isalnum(msg[i])) 671 break; 672 prog[i] = msg[i]; 673 } 674 prog[i] = 0; 675 676 /* add kernel prefix for kernel messages */ 677 if (flags & ISKERNEL) { 678 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 679 msg = buf; 680 msglen = strlen(buf); 681 } 682 683 /* log the message to the particular outputs */ 684 if (!Initialized) { 685 f = &consfile; 686 f->f_file = open(ctty, O_WRONLY, 0); 687 688 if (f->f_file >= 0) { 689 fprintlog(f, flags, msg); 690 (void)close(f->f_file); 691 } 692 (void)sigsetmask(omask); 693 return; 694 } 695 for (f = Files; f; f = f->f_next) { 696 /* skip messages that are incorrect priority */ 697 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 698 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 699 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 700 ) 701 || f->f_pmask[fac] == INTERNAL_NOPRI) 702 continue; 703 /* skip messages with the incorrect program name */ 704 if(f->f_program) 705 if(strcmp(prog, f->f_program) != 0) 706 continue; 707 708 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 709 continue; 710 711 /* don't output marks to recently written files */ 712 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 713 continue; 714 715 /* 716 * suppress duplicate lines to this file 717 */ 718 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 719 !strcmp(msg, f->f_prevline) && 720 !strcmp(from, f->f_prevhost)) { 721 (void)strncpy(f->f_lasttime, timestamp, 15); 722 f->f_prevcount++; 723 dprintf("msg repeated %d times, %ld sec of %d\n", 724 f->f_prevcount, (long)(now - f->f_time), 725 repeatinterval[f->f_repeatcount]); 726 /* 727 * If domark would have logged this by now, 728 * flush it now (so we don't hold isolated messages), 729 * but back off so we'll flush less often 730 * in the future. 731 */ 732 if (now > REPEATTIME(f)) { 733 fprintlog(f, flags, (char *)NULL); 734 BACKOFF(f); 735 } 736 } else { 737 /* new line, save it */ 738 if (f->f_prevcount) 739 fprintlog(f, 0, (char *)NULL); 740 f->f_repeatcount = 0; 741 f->f_prevpri = pri; 742 (void)strncpy(f->f_lasttime, timestamp, 15); 743 (void)strncpy(f->f_prevhost, from, 744 sizeof(f->f_prevhost)); 745 if (msglen < MAXSVLINE) { 746 f->f_prevlen = msglen; 747 (void)strcpy(f->f_prevline, msg); 748 fprintlog(f, flags, (char *)NULL); 749 } else { 750 f->f_prevline[0] = 0; 751 f->f_prevlen = 0; 752 fprintlog(f, flags, msg); 753 } 754 } 755 } 756 (void)sigsetmask(omask); 757 } 758 759 void 760 fprintlog(f, flags, msg) 761 struct filed *f; 762 int flags; 763 char *msg; 764 { 765 struct iovec iov[7]; 766 struct iovec *v; 767 int l; 768 char line[MAXLINE + 1], repbuf[80], greetings[200]; 769 char *msgret; 770 771 v = iov; 772 if (f->f_type == F_WALL) { 773 v->iov_base = greetings; 774 v->iov_len = snprintf(greetings, sizeof greetings, 775 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 776 f->f_prevhost, ctime(&now)); 777 v++; 778 v->iov_base = ""; 779 v->iov_len = 0; 780 v++; 781 } else { 782 v->iov_base = f->f_lasttime; 783 v->iov_len = 15; 784 v++; 785 v->iov_base = " "; 786 v->iov_len = 1; 787 v++; 788 } 789 790 if (LogFacPri) { 791 static char fp_buf[30]; /* Hollow laugh */ 792 int fac = f->f_prevpri & LOG_FACMASK; 793 int pri = LOG_PRI(f->f_prevpri); 794 char *f_s = 0; 795 char f_n[5]; /* Hollow laugh */ 796 char *p_s = 0; 797 char p_n[5]; /* Hollow laugh */ 798 799 if (LogFacPri > 1) { 800 CODE *c; 801 802 for (c = facilitynames; c; c++) { 803 if (c->c_val == fac) { 804 f_s = c->c_name; 805 break; 806 } 807 } 808 for (c = prioritynames; c; c++) { 809 if (c->c_val == pri) { 810 p_s = c->c_name; 811 break; 812 } 813 } 814 } 815 if (!f_s) { 816 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 817 f_s = f_n; 818 } 819 if (!p_s) { 820 snprintf(p_n, sizeof p_n, "%d", pri); 821 p_s = p_n; 822 } 823 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 824 v->iov_base = fp_buf; 825 v->iov_len = strlen(fp_buf); 826 } else { 827 v->iov_base=""; 828 v->iov_len = 0; 829 } 830 v++; 831 832 v->iov_base = f->f_prevhost; 833 v->iov_len = strlen(v->iov_base); 834 v++; 835 v->iov_base = " "; 836 v->iov_len = 1; 837 v++; 838 839 if (msg) { 840 v->iov_base = msg; 841 v->iov_len = strlen(msg); 842 } else if (f->f_prevcount > 1) { 843 v->iov_base = repbuf; 844 v->iov_len = sprintf(repbuf, "last message repeated %d times", 845 f->f_prevcount); 846 } else { 847 v->iov_base = f->f_prevline; 848 v->iov_len = f->f_prevlen; 849 } 850 v++; 851 852 dprintf("Logging to %s", TypeNames[f->f_type]); 853 f->f_time = now; 854 855 switch (f->f_type) { 856 case F_UNUSED: 857 dprintf("\n"); 858 break; 859 860 case F_FORW: 861 dprintf(" %s\n", f->f_un.f_forw.f_hname); 862 /* check for local vs remote messages */ 863 if (strcmp(f->f_prevhost, LocalHostName)) 864 l = snprintf(line, sizeof line - 1, 865 "<%d>%.15s Forwarded from %s: %s", 866 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 867 iov[5].iov_base); 868 else 869 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 870 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 871 if (l > MAXLINE) 872 l = MAXLINE; 873 if ((finet >= 0) && 874 (sendto(finet, line, l, 0, 875 (struct sockaddr *)&f->f_un.f_forw.f_addr, 876 sizeof(f->f_un.f_forw.f_addr)) != l)) { 877 int e = errno; 878 (void)close(f->f_file); 879 f->f_type = F_UNUSED; 880 errno = e; 881 logerror("sendto"); 882 } 883 break; 884 885 case F_FILE: 886 dprintf(" %s\n", f->f_un.f_fname); 887 v->iov_base = "\n"; 888 v->iov_len = 1; 889 if (writev(f->f_file, iov, 7) < 0) { 890 int e = errno; 891 (void)close(f->f_file); 892 f->f_type = F_UNUSED; 893 errno = e; 894 logerror(f->f_un.f_fname); 895 } else if (flags & SYNC_FILE) 896 (void)fsync(f->f_file); 897 break; 898 899 case F_PIPE: 900 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 901 v->iov_base = "\n"; 902 v->iov_len = 1; 903 if (f->f_un.f_pipe.f_pid == 0) { 904 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 905 &f->f_un.f_pipe.f_pid)) < 0) { 906 f->f_type = F_UNUSED; 907 logerror(f->f_un.f_pipe.f_pname); 908 break; 909 } 910 } 911 if (writev(f->f_file, iov, 7) < 0) { 912 int e = errno; 913 (void)close(f->f_file); 914 if (f->f_un.f_pipe.f_pid > 0) 915 deadq_enter(f->f_un.f_pipe.f_pid); 916 f->f_un.f_pipe.f_pid = 0; 917 errno = e; 918 logerror(f->f_un.f_pipe.f_pname); 919 } 920 break; 921 922 case F_CONSOLE: 923 if (flags & IGN_CONS) { 924 dprintf(" (ignored)\n"); 925 break; 926 } 927 /* FALLTHROUGH */ 928 929 case F_TTY: 930 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 931 v->iov_base = "\r\n"; 932 v->iov_len = 2; 933 934 errno = 0; /* ttymsg() only sometimes returns an errno */ 935 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 936 f->f_type = F_UNUSED; 937 logerror(msgret); 938 } 939 break; 940 941 case F_USERS: 942 case F_WALL: 943 dprintf("\n"); 944 v->iov_base = "\r\n"; 945 v->iov_len = 2; 946 wallmsg(f, iov); 947 break; 948 } 949 f->f_prevcount = 0; 950 } 951 952 /* 953 * WALLMSG -- Write a message to the world at large 954 * 955 * Write the specified message to either the entire 956 * world, or a list of approved users. 957 */ 958 void 959 wallmsg(f, iov) 960 struct filed *f; 961 struct iovec *iov; 962 { 963 static int reenter; /* avoid calling ourselves */ 964 FILE *uf; 965 struct utmp ut; 966 int i; 967 char *p; 968 char line[sizeof(ut.ut_line) + 1]; 969 970 if (reenter++) 971 return; 972 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 973 logerror(_PATH_UTMP); 974 reenter = 0; 975 return; 976 } 977 /* NOSTRICT */ 978 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 979 if (ut.ut_name[0] == '\0') 980 continue; 981 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 982 line[sizeof(ut.ut_line)] = '\0'; 983 if (f->f_type == F_WALL) { 984 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 985 errno = 0; /* already in msg */ 986 logerror(p); 987 } 988 continue; 989 } 990 /* should we send the message to this user? */ 991 for (i = 0; i < MAXUNAMES; i++) { 992 if (!f->f_un.f_uname[i][0]) 993 break; 994 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 995 UT_NAMESIZE)) { 996 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 997 != NULL) { 998 errno = 0; /* already in msg */ 999 logerror(p); 1000 } 1001 break; 1002 } 1003 } 1004 } 1005 (void)fclose(uf); 1006 reenter = 0; 1007 } 1008 1009 void 1010 reapchild(signo) 1011 int signo; 1012 { 1013 int status, code; 1014 pid_t pid; 1015 struct filed *f; 1016 char buf[256]; 1017 const char *reason; 1018 dq_t q; 1019 1020 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1021 if (!Initialized) 1022 /* Don't tell while we are initting. */ 1023 continue; 1024 1025 /* First, look if it's a process from the dead queue. */ 1026 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1027 if (q->dq_pid == pid) { 1028 TAILQ_REMOVE(&deadq_head, q, dq_entries); 1029 free(q); 1030 goto oncemore; 1031 } 1032 1033 /* Now, look in list of active processes. */ 1034 for (f = Files; f; f = f->f_next) 1035 if (f->f_type == F_PIPE && 1036 f->f_un.f_pipe.f_pid == pid) { 1037 (void)close(f->f_file); 1038 1039 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 1040 f->f_un.f_pipe.f_pid = 0; 1041 if (WIFSIGNALED(status)) { 1042 reason = "due to signal"; 1043 code = WTERMSIG(status); 1044 } else { 1045 reason = "with status"; 1046 code = WEXITSTATUS(status); 1047 if (code == 0) 1048 goto oncemore; /* Exited OK. */ 1049 } 1050 (void)snprintf(buf, sizeof buf, 1051 "Logging subprocess %d (%s) exited %s %d.", 1052 pid, f->f_un.f_pipe.f_pname, 1053 reason, code); 1054 logerror(buf); 1055 break; 1056 } 1057 oncemore: 1058 } 1059 } 1060 1061 /* 1062 * Return a printable representation of a host address. 1063 */ 1064 char * 1065 cvthname(f) 1066 struct sockaddr_in *f; 1067 { 1068 struct hostent *hp; 1069 char *p; 1070 1071 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1072 1073 if (f->sin_family != AF_INET) { 1074 dprintf("Malformed from address\n"); 1075 return ("???"); 1076 } 1077 hp = gethostbyaddr((char *)&f->sin_addr, 1078 sizeof(struct in_addr), f->sin_family); 1079 if (hp == 0) { 1080 dprintf("Host name for your address (%s) unknown\n", 1081 inet_ntoa(f->sin_addr)); 1082 return (inet_ntoa(f->sin_addr)); 1083 } 1084 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 1085 *p = '\0'; 1086 return (hp->h_name); 1087 } 1088 1089 void 1090 domark(signo) 1091 int signo; 1092 { 1093 struct filed *f; 1094 dq_t q; 1095 1096 now = time((time_t *)NULL); 1097 MarkSeq += TIMERINTVL; 1098 if (MarkSeq >= MarkInterval) { 1099 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1100 MarkSeq = 0; 1101 } 1102 1103 for (f = Files; f; f = f->f_next) { 1104 if (f->f_prevcount && now >= REPEATTIME(f)) { 1105 dprintf("flush %s: repeated %d times, %d sec.\n", 1106 TypeNames[f->f_type], f->f_prevcount, 1107 repeatinterval[f->f_repeatcount]); 1108 fprintlog(f, 0, (char *)NULL); 1109 BACKOFF(f); 1110 } 1111 } 1112 1113 /* Walk the dead queue, and see if we should signal somebody. */ 1114 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1115 switch (q->dq_timeout) { 1116 case 0: 1117 /* Already signalled once, try harder now. */ 1118 kill(q->dq_pid, SIGKILL); 1119 break; 1120 1121 case 1: 1122 /* 1123 * Timed out on dead queue, send terminate 1124 * signal. Note that we leave the removal 1125 * from the dead queue to reapchild(), which 1126 * will also log the event. 1127 */ 1128 kill(q->dq_pid, SIGTERM); 1129 /* FALLTROUGH */ 1130 1131 default: 1132 q->dq_timeout--; 1133 } 1134 1135 (void)alarm(TIMERINTVL); 1136 } 1137 1138 /* 1139 * Print syslogd errors some place. 1140 */ 1141 void 1142 logerror(type) 1143 const char *type; 1144 { 1145 char buf[512]; 1146 1147 if (errno) 1148 (void)snprintf(buf, 1149 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1150 else 1151 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1152 errno = 0; 1153 dprintf("%s\n", buf); 1154 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1155 } 1156 1157 void 1158 die(signo) 1159 int signo; 1160 { 1161 struct filed *f; 1162 int was_initialized; 1163 char buf[100]; 1164 int i; 1165 1166 was_initialized = Initialized; 1167 Initialized = 0; /* Don't log SIGCHLDs. */ 1168 for (f = Files; f != NULL; f = f->f_next) { 1169 /* flush any pending output */ 1170 if (f->f_prevcount) 1171 fprintlog(f, 0, (char *)NULL); 1172 if (f->f_type == F_PIPE) 1173 (void)close(f->f_file); 1174 } 1175 Initialized = was_initialized; 1176 if (signo) { 1177 dprintf("syslogd: exiting on signal %d\n", signo); 1178 (void)sprintf(buf, "exiting on signal %d", signo); 1179 errno = 0; 1180 logerror(buf); 1181 } 1182 for (i = 0; i < nfunix; i++) 1183 if (funixn[i] && funix[i] != -1) 1184 (void)unlink(funixn[i]); 1185 exit(1); 1186 } 1187 1188 /* 1189 * INIT -- Initialize syslogd from configuration table 1190 */ 1191 void 1192 init(signo) 1193 int signo; 1194 { 1195 int i; 1196 FILE *cf; 1197 struct filed *f, *next, **nextp; 1198 char *p; 1199 char cline[LINE_MAX]; 1200 char prog[NAME_MAX+1]; 1201 1202 dprintf("init\n"); 1203 1204 /* 1205 * Close all open log files. 1206 */ 1207 Initialized = 0; 1208 for (f = Files; f != NULL; f = next) { 1209 /* flush any pending output */ 1210 if (f->f_prevcount) 1211 fprintlog(f, 0, (char *)NULL); 1212 1213 switch (f->f_type) { 1214 case F_FILE: 1215 case F_FORW: 1216 case F_CONSOLE: 1217 case F_TTY: 1218 (void)close(f->f_file); 1219 break; 1220 case F_PIPE: 1221 (void)close(f->f_file); 1222 if (f->f_un.f_pipe.f_pid > 0) 1223 deadq_enter(f->f_un.f_pipe.f_pid); 1224 f->f_un.f_pipe.f_pid = 0; 1225 break; 1226 } 1227 next = f->f_next; 1228 if(f->f_program) free(f->f_program); 1229 free((char *)f); 1230 } 1231 Files = NULL; 1232 nextp = &Files; 1233 1234 /* open the configuration file */ 1235 if ((cf = fopen(ConfFile, "r")) == NULL) { 1236 dprintf("cannot open %s\n", ConfFile); 1237 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1238 cfline("*.ERR\t/dev/console", *nextp, "*"); 1239 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1240 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1241 Initialized = 1; 1242 return; 1243 } 1244 1245 /* 1246 * Foreach line in the conf table, open that file. 1247 */ 1248 f = NULL; 1249 strcpy(prog, "*"); 1250 while (fgets(cline, sizeof(cline), cf) != NULL) { 1251 /* 1252 * check for end-of-section, comments, strip off trailing 1253 * spaces and newline character. #!prog is treated specially: 1254 * following lines apply only to that program. 1255 */ 1256 for (p = cline; isspace(*p); ++p) 1257 continue; 1258 if (*p == 0) 1259 continue; 1260 if(*p == '#') { 1261 p++; 1262 if(*p!='!') 1263 continue; 1264 } 1265 if(*p=='!') { 1266 p++; 1267 while(isspace(*p)) p++; 1268 if(!*p) { 1269 strcpy(prog, "*"); 1270 continue; 1271 } 1272 for(i = 0; i < NAME_MAX; i++) { 1273 if(!isalnum(p[i])) 1274 break; 1275 prog[i] = p[i]; 1276 } 1277 prog[i] = 0; 1278 continue; 1279 } 1280 for (p = strchr(cline, '\0'); isspace(*--p);) 1281 continue; 1282 *++p = '\0'; 1283 f = (struct filed *)calloc(1, sizeof(*f)); 1284 *nextp = f; 1285 nextp = &f->f_next; 1286 cfline(cline, f, prog); 1287 } 1288 1289 /* close the configuration file */ 1290 (void)fclose(cf); 1291 1292 Initialized = 1; 1293 1294 if (Debug) { 1295 for (f = Files; f; f = f->f_next) { 1296 for (i = 0; i <= LOG_NFACILITIES; i++) 1297 if (f->f_pmask[i] == INTERNAL_NOPRI) 1298 printf("X "); 1299 else 1300 printf("%d ", f->f_pmask[i]); 1301 printf("%s: ", TypeNames[f->f_type]); 1302 switch (f->f_type) { 1303 case F_FILE: 1304 printf("%s", f->f_un.f_fname); 1305 break; 1306 1307 case F_CONSOLE: 1308 case F_TTY: 1309 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1310 break; 1311 1312 case F_FORW: 1313 printf("%s", f->f_un.f_forw.f_hname); 1314 break; 1315 1316 case F_PIPE: 1317 printf("%s", f->f_un.f_pipe.f_pname); 1318 break; 1319 1320 case F_USERS: 1321 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1322 printf("%s, ", f->f_un.f_uname[i]); 1323 break; 1324 } 1325 if(f->f_program) { 1326 printf(" (%s)", f->f_program); 1327 } 1328 printf("\n"); 1329 } 1330 } 1331 1332 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1333 dprintf("syslogd: restarted\n"); 1334 } 1335 1336 /* 1337 * Crack a configuration file line 1338 */ 1339 void 1340 cfline(line, f, prog) 1341 char *line; 1342 struct filed *f; 1343 char *prog; 1344 { 1345 struct hostent *hp; 1346 int i, pri; 1347 char *bp, *p, *q; 1348 char buf[MAXLINE], ebuf[100]; 1349 1350 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1351 1352 errno = 0; /* keep strerror() stuff out of logerror messages */ 1353 1354 /* clear out file entry */ 1355 memset(f, 0, sizeof(*f)); 1356 for (i = 0; i <= LOG_NFACILITIES; i++) 1357 f->f_pmask[i] = INTERNAL_NOPRI; 1358 1359 /* save program name if any */ 1360 if(prog && *prog=='*') prog = NULL; 1361 if(prog) { 1362 f->f_program = calloc(1, strlen(prog)+1); 1363 if(f->f_program) { 1364 strcpy(f->f_program, prog); 1365 } 1366 } 1367 1368 /* scan through the list of selectors */ 1369 for (p = line; *p && *p != '\t' && *p != ' ';) { 1370 int pri_done; 1371 int pri_cmp; 1372 1373 /* find the end of this facility name list */ 1374 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1375 continue; 1376 1377 /* get the priority comparison */ 1378 pri_cmp = 0; 1379 pri_done = 0; 1380 while (!pri_done) { 1381 switch (*q) { 1382 case '<': 1383 pri_cmp |= PRI_LT; 1384 q++; 1385 break; 1386 case '=': 1387 pri_cmp |= PRI_EQ; 1388 q++; 1389 break; 1390 case '>': 1391 pri_cmp |= PRI_GT; 1392 q++; 1393 break; 1394 default: 1395 pri_done++; 1396 break; 1397 } 1398 } 1399 if (!pri_cmp) 1400 pri_cmp = (UniquePriority) 1401 ? (PRI_EQ) 1402 : (PRI_EQ | PRI_GT) 1403 ; 1404 1405 /* collect priority name */ 1406 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1407 *bp++ = *q++; 1408 *bp = '\0'; 1409 1410 /* skip cruft */ 1411 while (strchr(",;", *q)) 1412 q++; 1413 1414 /* decode priority name */ 1415 if (*buf == '*') 1416 pri = LOG_PRIMASK + 1; 1417 else { 1418 pri = decode(buf, prioritynames); 1419 if (pri < 0) { 1420 (void)snprintf(ebuf, sizeof ebuf, 1421 "unknown priority name \"%s\"", buf); 1422 logerror(ebuf); 1423 return; 1424 } 1425 } 1426 1427 /* scan facilities */ 1428 while (*p && !strchr("\t.; ", *p)) { 1429 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1430 *bp++ = *p++; 1431 *bp = '\0'; 1432 1433 if (*buf == '*') 1434 for (i = 0; i < LOG_NFACILITIES; i++) { 1435 f->f_pmask[i] = pri; 1436 f->f_pcmp[i] = pri_cmp; 1437 } 1438 else { 1439 i = decode(buf, facilitynames); 1440 if (i < 0) { 1441 (void)snprintf(ebuf, sizeof ebuf, 1442 "unknown facility name \"%s\"", 1443 buf); 1444 logerror(ebuf); 1445 return; 1446 } 1447 f->f_pmask[i >> 3] = pri; 1448 f->f_pcmp[i >> 3] = pri_cmp; 1449 } 1450 while (*p == ',' || *p == ' ') 1451 p++; 1452 } 1453 1454 p = q; 1455 } 1456 1457 /* skip to action part */ 1458 while (*p == '\t' || *p == ' ') 1459 p++; 1460 1461 switch (*p) 1462 { 1463 case '@': 1464 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1465 hp = gethostbyname(p); 1466 if (hp == NULL) { 1467 extern int h_errno; 1468 1469 logerror(hstrerror(h_errno)); 1470 break; 1471 } 1472 memset(&f->f_un.f_forw.f_addr, 0, 1473 sizeof(f->f_un.f_forw.f_addr)); 1474 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1475 f->f_un.f_forw.f_addr.sin_port = LogPort; 1476 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1477 f->f_type = F_FORW; 1478 break; 1479 1480 case '/': 1481 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1482 f->f_type = F_UNUSED; 1483 logerror(p); 1484 break; 1485 } 1486 if (isatty(f->f_file)) { 1487 if (strcmp(p, ctty) == 0) 1488 f->f_type = F_CONSOLE; 1489 else 1490 f->f_type = F_TTY; 1491 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1492 } else { 1493 (void)strcpy(f->f_un.f_fname, p); 1494 f->f_type = F_FILE; 1495 } 1496 break; 1497 1498 case '|': 1499 f->f_un.f_pipe.f_pid = 0; 1500 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1501 f->f_type = F_PIPE; 1502 break; 1503 1504 case '*': 1505 f->f_type = F_WALL; 1506 break; 1507 1508 default: 1509 for (i = 0; i < MAXUNAMES && *p; i++) { 1510 for (q = p; *q && *q != ','; ) 1511 q++; 1512 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1513 if ((q - p) > UT_NAMESIZE) 1514 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1515 else 1516 f->f_un.f_uname[i][q - p] = '\0'; 1517 while (*q == ',' || *q == ' ') 1518 q++; 1519 p = q; 1520 } 1521 f->f_type = F_USERS; 1522 break; 1523 } 1524 } 1525 1526 1527 /* 1528 * Decode a symbolic name to a numeric value 1529 */ 1530 int 1531 decode(name, codetab) 1532 const char *name; 1533 CODE *codetab; 1534 { 1535 CODE *c; 1536 char *p, buf[40]; 1537 1538 if (isdigit(*name)) 1539 return (atoi(name)); 1540 1541 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1542 if (isupper(*name)) 1543 *p = tolower(*name); 1544 else 1545 *p = *name; 1546 } 1547 *p = '\0'; 1548 for (c = codetab; c->c_name; c++) 1549 if (!strcmp(buf, c->c_name)) 1550 return (c->c_val); 1551 1552 return (-1); 1553 } 1554 1555 /* 1556 * fork off and become a daemon, but wait for the child to come online 1557 * before returing to the parent, or we get disk thrashing at boot etc. 1558 * Set a timer so we don't hang forever if it wedges. 1559 */ 1560 int 1561 waitdaemon(nochdir, noclose, maxwait) 1562 int nochdir, noclose, maxwait; 1563 { 1564 int fd; 1565 int status; 1566 pid_t pid, childpid; 1567 1568 switch (childpid = fork()) { 1569 case -1: 1570 return (-1); 1571 case 0: 1572 break; 1573 default: 1574 signal(SIGALRM, timedout); 1575 alarm(maxwait); 1576 while ((pid = wait3(&status, 0, NULL)) != -1) { 1577 if (WIFEXITED(status)) 1578 errx(1, "child pid %d exited with return code %d", 1579 pid, WEXITSTATUS(status)); 1580 if (WIFSIGNALED(status)) 1581 errx(1, "child pid %d exited on signal %d%s", 1582 pid, WTERMSIG(status), 1583 WCOREDUMP(status) ? " (core dumped)" : 1584 ""); 1585 if (pid == childpid) /* it's gone... */ 1586 break; 1587 } 1588 exit(0); 1589 } 1590 1591 if (setsid() == -1) 1592 return (-1); 1593 1594 if (!nochdir) 1595 (void)chdir("/"); 1596 1597 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1598 (void)dup2(fd, STDIN_FILENO); 1599 (void)dup2(fd, STDOUT_FILENO); 1600 (void)dup2(fd, STDERR_FILENO); 1601 if (fd > 2) 1602 (void)close (fd); 1603 } 1604 return (getppid()); 1605 } 1606 1607 /* 1608 * We get a SIGALRM from the child when it's running and finished doing it's 1609 * fsync()'s or O_SYNC writes for all the boot messages. 1610 * 1611 * We also get a signal from the kernel if the timer expires, so check to 1612 * see what happened. 1613 */ 1614 void 1615 timedout(sig) 1616 int sig __unused; 1617 { 1618 int left; 1619 left = alarm(0); 1620 signal(SIGALRM, SIG_DFL); 1621 if (left == 0) 1622 errx(1, "timed out waiting for child"); 1623 else 1624 exit(0); 1625 } 1626 1627 /* 1628 * Add `s' to the list of allowable peer addresses to accept messages 1629 * from. 1630 * 1631 * `s' is a string in the form: 1632 * 1633 * [*]domainname[:{servicename|portnumber|*}] 1634 * 1635 * or 1636 * 1637 * netaddr/maskbits[:{servicename|portnumber|*}] 1638 * 1639 * Returns -1 on error, 0 if the argument was valid. 1640 */ 1641 int 1642 allowaddr(s) 1643 char *s; 1644 { 1645 char *cp1, *cp2; 1646 struct allowedpeer ap; 1647 struct servent *se; 1648 regex_t re; 1649 int i; 1650 1651 if ((cp1 = strrchr(s, ':'))) { 1652 /* service/port provided */ 1653 *cp1++ = '\0'; 1654 if (strlen(cp1) == 1 && *cp1 == '*') 1655 /* any port allowed */ 1656 ap.port = htons(0); 1657 else if ((se = getservbyname(cp1, "udp"))) 1658 ap.port = se->s_port; 1659 else { 1660 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1661 if (*cp2 != '\0') 1662 return -1; /* port not numeric */ 1663 } 1664 } else { 1665 if ((se = getservbyname("syslog", "udp"))) 1666 ap.port = se->s_port; 1667 else 1668 /* sanity, should not happen */ 1669 ap.port = htons(514); 1670 } 1671 1672 /* the regexp's are ugly, but the cleanest way */ 1673 1674 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1675 REG_EXTENDED)) 1676 /* if RE compilation fails, that's an internal error */ 1677 abort(); 1678 if (regexec(&re, s, 0, 0, 0) == 0) { 1679 /* arg `s' is numeric */ 1680 ap.isnumeric = 1; 1681 if ((cp1 = strchr(s, '/')) != NULL) { 1682 *cp1++ = '\0'; 1683 i = atoi(cp1); 1684 if (i < 0 || i > 32) 1685 return -1; 1686 /* convert masklen to netmask */ 1687 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1688 } 1689 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1690 return -1; 1691 if (cp1 == NULL) { 1692 /* use default netmask */ 1693 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1694 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1695 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1696 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1697 else 1698 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1699 } 1700 } else { 1701 /* arg `s' is domain name */ 1702 ap.isnumeric = 0; 1703 ap.a_name = s; 1704 } 1705 regfree(&re); 1706 1707 if (Debug) { 1708 printf("allowaddr: rule %d: ", NumAllowed); 1709 if (ap.isnumeric) { 1710 printf("numeric, "); 1711 printf("addr = %s, ", 1712 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1713 printf("mask = %s; ", 1714 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1715 } else 1716 printf("domainname = %s; ", ap.a_name); 1717 printf("port = %d\n", ntohs(ap.port)); 1718 } 1719 1720 if ((AllowedPeers = realloc(AllowedPeers, 1721 ++NumAllowed * sizeof(struct allowedpeer))) 1722 == NULL) { 1723 fprintf(stderr, "Out of memory!\n"); 1724 exit(EX_OSERR); 1725 } 1726 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1727 return 0; 1728 } 1729 1730 /* 1731 * Validate that the remote peer has permission to log to us. 1732 */ 1733 int 1734 validate(sin, hname) 1735 struct sockaddr_in *sin; 1736 const char *hname; 1737 { 1738 int i; 1739 size_t l1, l2; 1740 char *cp, name[MAXHOSTNAMELEN]; 1741 struct allowedpeer *ap; 1742 1743 if (NumAllowed == 0) 1744 /* traditional behaviour, allow everything */ 1745 return 1; 1746 1747 strncpy(name, hname, sizeof name); 1748 if (strchr(name, '.') == NULL) { 1749 strncat(name, ".", sizeof name - strlen(name) - 1); 1750 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1751 } 1752 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1753 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1754 ntohs(sin->sin_port), name); 1755 1756 /* now, walk down the list */ 1757 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1758 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1759 dprintf("rejected in rule %d due to port mismatch.\n", i); 1760 continue; 1761 } 1762 1763 if (ap->isnumeric) { 1764 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1765 != ap->a_addr.s_addr) { 1766 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1767 continue; 1768 } 1769 } else { 1770 cp = ap->a_name; 1771 l1 = strlen(name); 1772 if (*cp == '*') { 1773 /* allow wildmatch */ 1774 cp++; 1775 l2 = strlen(cp); 1776 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1777 dprintf("rejected in rule %d due to name mismatch.\n", i); 1778 continue; 1779 } 1780 } else { 1781 /* exact match */ 1782 l2 = strlen(cp); 1783 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1784 dprintf("rejected in rule %d due to name mismatch.\n", i); 1785 continue; 1786 } 1787 } 1788 } 1789 dprintf("accepted in rule %d.\n", i); 1790 return 1; /* hooray! */ 1791 } 1792 return 0; 1793 } 1794 1795 /* 1796 * Fairly similar to popen(3), but returns an open descriptor, as 1797 * opposed to a FILE *. 1798 */ 1799 int 1800 p_open(prog, pid) 1801 char *prog; 1802 pid_t *pid; 1803 { 1804 int pfd[2], nulldesc, i; 1805 sigset_t omask, mask; 1806 char *argv[4]; /* sh -c cmd NULL */ 1807 char errmsg[200]; 1808 1809 if (pipe(pfd) == -1) 1810 return -1; 1811 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1812 /* we are royally screwed anyway */ 1813 return -1; 1814 1815 sigemptyset(&mask); 1816 sigaddset(&mask, SIGALRM); 1817 sigaddset(&mask, SIGHUP); 1818 sigprocmask(SIG_BLOCK, &mask, &omask); 1819 switch ((*pid = fork())) { 1820 case -1: 1821 sigprocmask(SIG_SETMASK, &omask, 0); 1822 close(nulldesc); 1823 return -1; 1824 1825 case 0: 1826 argv[0] = "sh"; 1827 argv[1] = "-c"; 1828 argv[2] = prog; 1829 argv[3] = NULL; 1830 1831 alarm(0); 1832 (void)setsid(); /* Avoid catching SIGHUPs. */ 1833 1834 /* 1835 * Throw away pending signals, and reset signal 1836 * behaviour to standard values. 1837 */ 1838 signal(SIGALRM, SIG_IGN); 1839 signal(SIGHUP, SIG_IGN); 1840 sigprocmask(SIG_SETMASK, &omask, 0); 1841 signal(SIGPIPE, SIG_DFL); 1842 signal(SIGQUIT, SIG_DFL); 1843 signal(SIGALRM, SIG_DFL); 1844 signal(SIGHUP, SIG_DFL); 1845 1846 dup2(pfd[0], STDIN_FILENO); 1847 dup2(nulldesc, STDOUT_FILENO); 1848 dup2(nulldesc, STDERR_FILENO); 1849 for (i = getdtablesize(); i > 2; i--) 1850 (void) close(i); 1851 1852 (void) execvp(_PATH_BSHELL, argv); 1853 _exit(255); 1854 } 1855 1856 sigprocmask(SIG_SETMASK, &omask, 0); 1857 close(nulldesc); 1858 close(pfd[0]); 1859 /* 1860 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1861 * supposed to get an EWOULDBLOCK on writev(2), which is 1862 * caught by the logic above anyway, which will in turn close 1863 * the pipe, and fork a new logging subprocess if necessary. 1864 * The stale subprocess will be killed some time later unless 1865 * it terminated itself due to closing its input pipe (so we 1866 * get rid of really dead puppies). 1867 */ 1868 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1869 /* This is bad. */ 1870 (void)snprintf(errmsg, sizeof errmsg, 1871 "Warning: cannot change pipe to PID %d to " 1872 "non-blocking behaviour.", 1873 (int)*pid); 1874 logerror(errmsg); 1875 } 1876 return pfd[1]; 1877 } 1878 1879 void 1880 deadq_enter(pid) 1881 pid_t pid; 1882 { 1883 dq_t p; 1884 1885 p = malloc(sizeof(struct deadq_entry)); 1886 if (p == 0) { 1887 errno = 0; 1888 logerror("panic: out of virtual memory!"); 1889 exit(1); 1890 } 1891 1892 p->dq_pid = pid; 1893 p->dq_timeout = DQ_TIMO_INIT; 1894 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1895 } 1896