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 1.43 1998/12/04 06:49:20 jkh 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 sigset_t omask, nmask; 1070 char *p; 1071 1072 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1073 1074 if (f->sin_family != AF_INET) { 1075 dprintf("Malformed from address\n"); 1076 return ("???"); 1077 } 1078 sigemptyset(&nmask); 1079 sigaddset(&nmask, SIGHUP); 1080 sigprocmask(SIG_BLOCK, &nmask, &omask); 1081 hp = gethostbyaddr((char *)&f->sin_addr, 1082 sizeof(struct in_addr), f->sin_family); 1083 sigprocmask(SIG_SETMASK, &omask, NULL); 1084 if (hp == 0) { 1085 dprintf("Host name for your address (%s) unknown\n", 1086 inet_ntoa(f->sin_addr)); 1087 return (inet_ntoa(f->sin_addr)); 1088 } 1089 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 1090 *p = '\0'; 1091 return (hp->h_name); 1092 } 1093 1094 void 1095 domark(signo) 1096 int signo; 1097 { 1098 struct filed *f; 1099 dq_t q; 1100 1101 now = time((time_t *)NULL); 1102 MarkSeq += TIMERINTVL; 1103 if (MarkSeq >= MarkInterval) { 1104 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1105 MarkSeq = 0; 1106 } 1107 1108 for (f = Files; f; f = f->f_next) { 1109 if (f->f_prevcount && now >= REPEATTIME(f)) { 1110 dprintf("flush %s: repeated %d times, %d sec.\n", 1111 TypeNames[f->f_type], f->f_prevcount, 1112 repeatinterval[f->f_repeatcount]); 1113 fprintlog(f, 0, (char *)NULL); 1114 BACKOFF(f); 1115 } 1116 } 1117 1118 /* Walk the dead queue, and see if we should signal somebody. */ 1119 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1120 switch (q->dq_timeout) { 1121 case 0: 1122 /* Already signalled once, try harder now. */ 1123 kill(q->dq_pid, SIGKILL); 1124 break; 1125 1126 case 1: 1127 /* 1128 * Timed out on dead queue, send terminate 1129 * signal. Note that we leave the removal 1130 * from the dead queue to reapchild(), which 1131 * will also log the event. 1132 */ 1133 kill(q->dq_pid, SIGTERM); 1134 /* FALLTROUGH */ 1135 1136 default: 1137 q->dq_timeout--; 1138 } 1139 1140 (void)alarm(TIMERINTVL); 1141 } 1142 1143 /* 1144 * Print syslogd errors some place. 1145 */ 1146 void 1147 logerror(type) 1148 const char *type; 1149 { 1150 char buf[512]; 1151 1152 if (errno) 1153 (void)snprintf(buf, 1154 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1155 else 1156 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1157 errno = 0; 1158 dprintf("%s\n", buf); 1159 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1160 } 1161 1162 void 1163 die(signo) 1164 int signo; 1165 { 1166 struct filed *f; 1167 int was_initialized; 1168 char buf[100]; 1169 int i; 1170 1171 was_initialized = Initialized; 1172 Initialized = 0; /* Don't log SIGCHLDs. */ 1173 for (f = Files; f != NULL; f = f->f_next) { 1174 /* flush any pending output */ 1175 if (f->f_prevcount) 1176 fprintlog(f, 0, (char *)NULL); 1177 if (f->f_type == F_PIPE) 1178 (void)close(f->f_file); 1179 } 1180 Initialized = was_initialized; 1181 if (signo) { 1182 dprintf("syslogd: exiting on signal %d\n", signo); 1183 (void)sprintf(buf, "exiting on signal %d", signo); 1184 errno = 0; 1185 logerror(buf); 1186 } 1187 for (i = 0; i < nfunix; i++) 1188 if (funixn[i] && funix[i] != -1) 1189 (void)unlink(funixn[i]); 1190 exit(1); 1191 } 1192 1193 /* 1194 * INIT -- Initialize syslogd from configuration table 1195 */ 1196 void 1197 init(signo) 1198 int signo; 1199 { 1200 int i; 1201 FILE *cf; 1202 struct filed *f, *next, **nextp; 1203 char *p; 1204 char cline[LINE_MAX]; 1205 char prog[NAME_MAX+1]; 1206 1207 dprintf("init\n"); 1208 1209 /* 1210 * Close all open log files. 1211 */ 1212 Initialized = 0; 1213 for (f = Files; f != NULL; f = next) { 1214 /* flush any pending output */ 1215 if (f->f_prevcount) 1216 fprintlog(f, 0, (char *)NULL); 1217 1218 switch (f->f_type) { 1219 case F_FILE: 1220 case F_FORW: 1221 case F_CONSOLE: 1222 case F_TTY: 1223 (void)close(f->f_file); 1224 break; 1225 case F_PIPE: 1226 (void)close(f->f_file); 1227 if (f->f_un.f_pipe.f_pid > 0) 1228 deadq_enter(f->f_un.f_pipe.f_pid); 1229 f->f_un.f_pipe.f_pid = 0; 1230 break; 1231 } 1232 next = f->f_next; 1233 if(f->f_program) free(f->f_program); 1234 free((char *)f); 1235 } 1236 Files = NULL; 1237 nextp = &Files; 1238 1239 /* open the configuration file */ 1240 if ((cf = fopen(ConfFile, "r")) == NULL) { 1241 dprintf("cannot open %s\n", ConfFile); 1242 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1243 cfline("*.ERR\t/dev/console", *nextp, "*"); 1244 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1245 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1246 Initialized = 1; 1247 return; 1248 } 1249 1250 /* 1251 * Foreach line in the conf table, open that file. 1252 */ 1253 f = NULL; 1254 strcpy(prog, "*"); 1255 while (fgets(cline, sizeof(cline), cf) != NULL) { 1256 /* 1257 * check for end-of-section, comments, strip off trailing 1258 * spaces and newline character. #!prog is treated specially: 1259 * following lines apply only to that program. 1260 */ 1261 for (p = cline; isspace(*p); ++p) 1262 continue; 1263 if (*p == 0) 1264 continue; 1265 if(*p == '#') { 1266 p++; 1267 if(*p!='!') 1268 continue; 1269 } 1270 if(*p=='!') { 1271 p++; 1272 while(isspace(*p)) p++; 1273 if(!*p) { 1274 strcpy(prog, "*"); 1275 continue; 1276 } 1277 for(i = 0; i < NAME_MAX; i++) { 1278 if(!isalnum(p[i])) 1279 break; 1280 prog[i] = p[i]; 1281 } 1282 prog[i] = 0; 1283 continue; 1284 } 1285 for (p = strchr(cline, '\0'); isspace(*--p);) 1286 continue; 1287 *++p = '\0'; 1288 f = (struct filed *)calloc(1, sizeof(*f)); 1289 *nextp = f; 1290 nextp = &f->f_next; 1291 cfline(cline, f, prog); 1292 } 1293 1294 /* close the configuration file */ 1295 (void)fclose(cf); 1296 1297 Initialized = 1; 1298 1299 if (Debug) { 1300 for (f = Files; f; f = f->f_next) { 1301 for (i = 0; i <= LOG_NFACILITIES; i++) 1302 if (f->f_pmask[i] == INTERNAL_NOPRI) 1303 printf("X "); 1304 else 1305 printf("%d ", f->f_pmask[i]); 1306 printf("%s: ", TypeNames[f->f_type]); 1307 switch (f->f_type) { 1308 case F_FILE: 1309 printf("%s", f->f_un.f_fname); 1310 break; 1311 1312 case F_CONSOLE: 1313 case F_TTY: 1314 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1315 break; 1316 1317 case F_FORW: 1318 printf("%s", f->f_un.f_forw.f_hname); 1319 break; 1320 1321 case F_PIPE: 1322 printf("%s", f->f_un.f_pipe.f_pname); 1323 break; 1324 1325 case F_USERS: 1326 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1327 printf("%s, ", f->f_un.f_uname[i]); 1328 break; 1329 } 1330 if(f->f_program) { 1331 printf(" (%s)", f->f_program); 1332 } 1333 printf("\n"); 1334 } 1335 } 1336 1337 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1338 dprintf("syslogd: restarted\n"); 1339 } 1340 1341 /* 1342 * Crack a configuration file line 1343 */ 1344 void 1345 cfline(line, f, prog) 1346 char *line; 1347 struct filed *f; 1348 char *prog; 1349 { 1350 struct hostent *hp; 1351 int i, pri; 1352 char *bp, *p, *q; 1353 char buf[MAXLINE], ebuf[100]; 1354 1355 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1356 1357 errno = 0; /* keep strerror() stuff out of logerror messages */ 1358 1359 /* clear out file entry */ 1360 memset(f, 0, sizeof(*f)); 1361 for (i = 0; i <= LOG_NFACILITIES; i++) 1362 f->f_pmask[i] = INTERNAL_NOPRI; 1363 1364 /* save program name if any */ 1365 if(prog && *prog=='*') prog = NULL; 1366 if(prog) { 1367 f->f_program = calloc(1, strlen(prog)+1); 1368 if(f->f_program) { 1369 strcpy(f->f_program, prog); 1370 } 1371 } 1372 1373 /* scan through the list of selectors */ 1374 for (p = line; *p && *p != '\t' && *p != ' ';) { 1375 int pri_done; 1376 int pri_cmp; 1377 1378 /* find the end of this facility name list */ 1379 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1380 continue; 1381 1382 /* get the priority comparison */ 1383 pri_cmp = 0; 1384 pri_done = 0; 1385 while (!pri_done) { 1386 switch (*q) { 1387 case '<': 1388 pri_cmp |= PRI_LT; 1389 q++; 1390 break; 1391 case '=': 1392 pri_cmp |= PRI_EQ; 1393 q++; 1394 break; 1395 case '>': 1396 pri_cmp |= PRI_GT; 1397 q++; 1398 break; 1399 default: 1400 pri_done++; 1401 break; 1402 } 1403 } 1404 if (!pri_cmp) 1405 pri_cmp = (UniquePriority) 1406 ? (PRI_EQ) 1407 : (PRI_EQ | PRI_GT) 1408 ; 1409 1410 /* collect priority name */ 1411 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1412 *bp++ = *q++; 1413 *bp = '\0'; 1414 1415 /* skip cruft */ 1416 while (strchr(",;", *q)) 1417 q++; 1418 1419 /* decode priority name */ 1420 if (*buf == '*') 1421 pri = LOG_PRIMASK + 1; 1422 else { 1423 pri = decode(buf, prioritynames); 1424 if (pri < 0) { 1425 (void)snprintf(ebuf, sizeof ebuf, 1426 "unknown priority name \"%s\"", buf); 1427 logerror(ebuf); 1428 return; 1429 } 1430 } 1431 1432 /* scan facilities */ 1433 while (*p && !strchr("\t.; ", *p)) { 1434 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1435 *bp++ = *p++; 1436 *bp = '\0'; 1437 1438 if (*buf == '*') 1439 for (i = 0; i < LOG_NFACILITIES; i++) { 1440 f->f_pmask[i] = pri; 1441 f->f_pcmp[i] = pri_cmp; 1442 } 1443 else { 1444 i = decode(buf, facilitynames); 1445 if (i < 0) { 1446 (void)snprintf(ebuf, sizeof ebuf, 1447 "unknown facility name \"%s\"", 1448 buf); 1449 logerror(ebuf); 1450 return; 1451 } 1452 f->f_pmask[i >> 3] = pri; 1453 f->f_pcmp[i >> 3] = pri_cmp; 1454 } 1455 while (*p == ',' || *p == ' ') 1456 p++; 1457 } 1458 1459 p = q; 1460 } 1461 1462 /* skip to action part */ 1463 while (*p == '\t' || *p == ' ') 1464 p++; 1465 1466 switch (*p) 1467 { 1468 case '@': 1469 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1470 hp = gethostbyname(p); 1471 if (hp == NULL) { 1472 extern int h_errno; 1473 1474 logerror(hstrerror(h_errno)); 1475 break; 1476 } 1477 memset(&f->f_un.f_forw.f_addr, 0, 1478 sizeof(f->f_un.f_forw.f_addr)); 1479 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1480 f->f_un.f_forw.f_addr.sin_port = LogPort; 1481 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1482 f->f_type = F_FORW; 1483 break; 1484 1485 case '/': 1486 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1487 f->f_type = F_UNUSED; 1488 logerror(p); 1489 break; 1490 } 1491 if (isatty(f->f_file)) { 1492 if (strcmp(p, ctty) == 0) 1493 f->f_type = F_CONSOLE; 1494 else 1495 f->f_type = F_TTY; 1496 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1497 } else { 1498 (void)strcpy(f->f_un.f_fname, p); 1499 f->f_type = F_FILE; 1500 } 1501 break; 1502 1503 case '|': 1504 f->f_un.f_pipe.f_pid = 0; 1505 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1506 f->f_type = F_PIPE; 1507 break; 1508 1509 case '*': 1510 f->f_type = F_WALL; 1511 break; 1512 1513 default: 1514 for (i = 0; i < MAXUNAMES && *p; i++) { 1515 for (q = p; *q && *q != ','; ) 1516 q++; 1517 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1518 if ((q - p) > UT_NAMESIZE) 1519 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1520 else 1521 f->f_un.f_uname[i][q - p] = '\0'; 1522 while (*q == ',' || *q == ' ') 1523 q++; 1524 p = q; 1525 } 1526 f->f_type = F_USERS; 1527 break; 1528 } 1529 } 1530 1531 1532 /* 1533 * Decode a symbolic name to a numeric value 1534 */ 1535 int 1536 decode(name, codetab) 1537 const char *name; 1538 CODE *codetab; 1539 { 1540 CODE *c; 1541 char *p, buf[40]; 1542 1543 if (isdigit(*name)) 1544 return (atoi(name)); 1545 1546 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1547 if (isupper(*name)) 1548 *p = tolower(*name); 1549 else 1550 *p = *name; 1551 } 1552 *p = '\0'; 1553 for (c = codetab; c->c_name; c++) 1554 if (!strcmp(buf, c->c_name)) 1555 return (c->c_val); 1556 1557 return (-1); 1558 } 1559 1560 /* 1561 * fork off and become a daemon, but wait for the child to come online 1562 * before returing to the parent, or we get disk thrashing at boot etc. 1563 * Set a timer so we don't hang forever if it wedges. 1564 */ 1565 int 1566 waitdaemon(nochdir, noclose, maxwait) 1567 int nochdir, noclose, maxwait; 1568 { 1569 int fd; 1570 int status; 1571 pid_t pid, childpid; 1572 1573 switch (childpid = fork()) { 1574 case -1: 1575 return (-1); 1576 case 0: 1577 break; 1578 default: 1579 signal(SIGALRM, timedout); 1580 alarm(maxwait); 1581 while ((pid = wait3(&status, 0, NULL)) != -1) { 1582 if (WIFEXITED(status)) 1583 errx(1, "child pid %d exited with return code %d", 1584 pid, WEXITSTATUS(status)); 1585 if (WIFSIGNALED(status)) 1586 errx(1, "child pid %d exited on signal %d%s", 1587 pid, WTERMSIG(status), 1588 WCOREDUMP(status) ? " (core dumped)" : 1589 ""); 1590 if (pid == childpid) /* it's gone... */ 1591 break; 1592 } 1593 exit(0); 1594 } 1595 1596 if (setsid() == -1) 1597 return (-1); 1598 1599 if (!nochdir) 1600 (void)chdir("/"); 1601 1602 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1603 (void)dup2(fd, STDIN_FILENO); 1604 (void)dup2(fd, STDOUT_FILENO); 1605 (void)dup2(fd, STDERR_FILENO); 1606 if (fd > 2) 1607 (void)close (fd); 1608 } 1609 return (getppid()); 1610 } 1611 1612 /* 1613 * We get a SIGALRM from the child when it's running and finished doing it's 1614 * fsync()'s or O_SYNC writes for all the boot messages. 1615 * 1616 * We also get a signal from the kernel if the timer expires, so check to 1617 * see what happened. 1618 */ 1619 void 1620 timedout(sig) 1621 int sig __unused; 1622 { 1623 int left; 1624 left = alarm(0); 1625 signal(SIGALRM, SIG_DFL); 1626 if (left == 0) 1627 errx(1, "timed out waiting for child"); 1628 else 1629 exit(0); 1630 } 1631 1632 /* 1633 * Add `s' to the list of allowable peer addresses to accept messages 1634 * from. 1635 * 1636 * `s' is a string in the form: 1637 * 1638 * [*]domainname[:{servicename|portnumber|*}] 1639 * 1640 * or 1641 * 1642 * netaddr/maskbits[:{servicename|portnumber|*}] 1643 * 1644 * Returns -1 on error, 0 if the argument was valid. 1645 */ 1646 int 1647 allowaddr(s) 1648 char *s; 1649 { 1650 char *cp1, *cp2; 1651 struct allowedpeer ap; 1652 struct servent *se; 1653 regex_t re; 1654 int i; 1655 1656 if ((cp1 = strrchr(s, ':'))) { 1657 /* service/port provided */ 1658 *cp1++ = '\0'; 1659 if (strlen(cp1) == 1 && *cp1 == '*') 1660 /* any port allowed */ 1661 ap.port = htons(0); 1662 else if ((se = getservbyname(cp1, "udp"))) 1663 ap.port = se->s_port; 1664 else { 1665 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1666 if (*cp2 != '\0') 1667 return -1; /* port not numeric */ 1668 } 1669 } else { 1670 if ((se = getservbyname("syslog", "udp"))) 1671 ap.port = se->s_port; 1672 else 1673 /* sanity, should not happen */ 1674 ap.port = htons(514); 1675 } 1676 1677 /* the regexp's are ugly, but the cleanest way */ 1678 1679 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1680 REG_EXTENDED)) 1681 /* if RE compilation fails, that's an internal error */ 1682 abort(); 1683 if (regexec(&re, s, 0, 0, 0) == 0) { 1684 /* arg `s' is numeric */ 1685 ap.isnumeric = 1; 1686 if ((cp1 = strchr(s, '/')) != NULL) { 1687 *cp1++ = '\0'; 1688 i = atoi(cp1); 1689 if (i < 0 || i > 32) 1690 return -1; 1691 /* convert masklen to netmask */ 1692 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1693 } 1694 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1695 return -1; 1696 if (cp1 == NULL) { 1697 /* use default netmask */ 1698 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1699 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1700 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1701 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1702 else 1703 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1704 } 1705 } else { 1706 /* arg `s' is domain name */ 1707 ap.isnumeric = 0; 1708 ap.a_name = s; 1709 } 1710 regfree(&re); 1711 1712 if (Debug) { 1713 printf("allowaddr: rule %d: ", NumAllowed); 1714 if (ap.isnumeric) { 1715 printf("numeric, "); 1716 printf("addr = %s, ", 1717 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1718 printf("mask = %s; ", 1719 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1720 } else 1721 printf("domainname = %s; ", ap.a_name); 1722 printf("port = %d\n", ntohs(ap.port)); 1723 } 1724 1725 if ((AllowedPeers = realloc(AllowedPeers, 1726 ++NumAllowed * sizeof(struct allowedpeer))) 1727 == NULL) { 1728 fprintf(stderr, "Out of memory!\n"); 1729 exit(EX_OSERR); 1730 } 1731 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1732 return 0; 1733 } 1734 1735 /* 1736 * Validate that the remote peer has permission to log to us. 1737 */ 1738 int 1739 validate(sin, hname) 1740 struct sockaddr_in *sin; 1741 const char *hname; 1742 { 1743 int i; 1744 size_t l1, l2; 1745 char *cp, name[MAXHOSTNAMELEN]; 1746 struct allowedpeer *ap; 1747 1748 if (NumAllowed == 0) 1749 /* traditional behaviour, allow everything */ 1750 return 1; 1751 1752 strncpy(name, hname, sizeof name); 1753 if (strchr(name, '.') == NULL) { 1754 strncat(name, ".", sizeof name - strlen(name) - 1); 1755 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1756 } 1757 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1758 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1759 ntohs(sin->sin_port), name); 1760 1761 /* now, walk down the list */ 1762 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1763 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1764 dprintf("rejected in rule %d due to port mismatch.\n", i); 1765 continue; 1766 } 1767 1768 if (ap->isnumeric) { 1769 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1770 != ap->a_addr.s_addr) { 1771 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1772 continue; 1773 } 1774 } else { 1775 cp = ap->a_name; 1776 l1 = strlen(name); 1777 if (*cp == '*') { 1778 /* allow wildmatch */ 1779 cp++; 1780 l2 = strlen(cp); 1781 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1782 dprintf("rejected in rule %d due to name mismatch.\n", i); 1783 continue; 1784 } 1785 } else { 1786 /* exact match */ 1787 l2 = strlen(cp); 1788 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1789 dprintf("rejected in rule %d due to name mismatch.\n", i); 1790 continue; 1791 } 1792 } 1793 } 1794 dprintf("accepted in rule %d.\n", i); 1795 return 1; /* hooray! */ 1796 } 1797 return 0; 1798 } 1799 1800 /* 1801 * Fairly similar to popen(3), but returns an open descriptor, as 1802 * opposed to a FILE *. 1803 */ 1804 int 1805 p_open(prog, pid) 1806 char *prog; 1807 pid_t *pid; 1808 { 1809 int pfd[2], nulldesc, i; 1810 sigset_t omask, mask; 1811 char *argv[4]; /* sh -c cmd NULL */ 1812 char errmsg[200]; 1813 1814 if (pipe(pfd) == -1) 1815 return -1; 1816 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1817 /* we are royally screwed anyway */ 1818 return -1; 1819 1820 sigemptyset(&mask); 1821 sigaddset(&mask, SIGALRM); 1822 sigaddset(&mask, SIGHUP); 1823 sigprocmask(SIG_BLOCK, &mask, &omask); 1824 switch ((*pid = fork())) { 1825 case -1: 1826 sigprocmask(SIG_SETMASK, &omask, 0); 1827 close(nulldesc); 1828 return -1; 1829 1830 case 0: 1831 argv[0] = "sh"; 1832 argv[1] = "-c"; 1833 argv[2] = prog; 1834 argv[3] = NULL; 1835 1836 alarm(0); 1837 (void)setsid(); /* Avoid catching SIGHUPs. */ 1838 1839 /* 1840 * Throw away pending signals, and reset signal 1841 * behaviour to standard values. 1842 */ 1843 signal(SIGALRM, SIG_IGN); 1844 signal(SIGHUP, SIG_IGN); 1845 sigprocmask(SIG_SETMASK, &omask, 0); 1846 signal(SIGPIPE, SIG_DFL); 1847 signal(SIGQUIT, SIG_DFL); 1848 signal(SIGALRM, SIG_DFL); 1849 signal(SIGHUP, SIG_DFL); 1850 1851 dup2(pfd[0], STDIN_FILENO); 1852 dup2(nulldesc, STDOUT_FILENO); 1853 dup2(nulldesc, STDERR_FILENO); 1854 for (i = getdtablesize(); i > 2; i--) 1855 (void) close(i); 1856 1857 (void) execvp(_PATH_BSHELL, argv); 1858 _exit(255); 1859 } 1860 1861 sigprocmask(SIG_SETMASK, &omask, 0); 1862 close(nulldesc); 1863 close(pfd[0]); 1864 /* 1865 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1866 * supposed to get an EWOULDBLOCK on writev(2), which is 1867 * caught by the logic above anyway, which will in turn close 1868 * the pipe, and fork a new logging subprocess if necessary. 1869 * The stale subprocess will be killed some time later unless 1870 * it terminated itself due to closing its input pipe (so we 1871 * get rid of really dead puppies). 1872 */ 1873 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1874 /* This is bad. */ 1875 (void)snprintf(errmsg, sizeof errmsg, 1876 "Warning: cannot change pipe to PID %d to " 1877 "non-blocking behaviour.", 1878 (int)*pid); 1879 logerror(errmsg); 1880 } 1881 return pfd[1]; 1882 } 1883 1884 void 1885 deadq_enter(pid) 1886 pid_t pid; 1887 { 1888 dq_t p; 1889 1890 p = malloc(sizeof(struct deadq_entry)); 1891 if (p == 0) { 1892 errno = 0; 1893 logerror("panic: out of virtual memory!"); 1894 exit(1); 1895 } 1896 1897 p->dq_pid = pid; 1898 p->dq_timeout = DQ_TIMO_INIT; 1899 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1900 } 1901