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 1.40 1998/07/27 13:04:14 phk 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", Vogons); 495 logmsg(LOG_SYSLOG|LOG_AUTH, line, 496 LocalHostName, ADDDATE); 497 } 498 } else if (l > 0) { 499 line[l] = '\0'; 500 hname = cvthname(&frominet); 501 if (validate(&frominet, hname)) 502 printline(hname, line); 503 } else if (l < 0 && errno != EINTR) 504 logerror("recvfrom inet"); 505 } 506 for (i = 0; i < nfunix; i++) { 507 if (funix[i] != -1 && FD_ISSET(funix[i], &readfds)) { 508 len = sizeof(fromunix); 509 l = recvfrom(funix[i], line, MAXLINE, 0, 510 (struct sockaddr *)&fromunix, &len); 511 if (l > 0) { 512 line[l] = '\0'; 513 printline(LocalHostName, line); 514 } else if (l < 0 && errno != EINTR) 515 logerror("recvfrom unix"); 516 } 517 } 518 } 519 } 520 521 static void 522 usage() 523 { 524 525 fprintf(stderr, "%s\n%s\n%s\n", 526 "usage: syslogd [-dsuv] [-a allowed_peer] [-f config_file]", 527 " [-m mark_interval] [-p log_socket]", 528 " [-l log_socket]"); 529 exit(1); 530 } 531 532 /* 533 * Take a raw input line, decode the message, and print the message 534 * on the appropriate log files. 535 */ 536 void 537 printline(hname, msg) 538 char *hname; 539 char *msg; 540 { 541 int c, pri; 542 char *p, *q, line[MAXLINE + 1]; 543 544 /* test for special codes */ 545 pri = DEFUPRI; 546 p = msg; 547 if (*p == '<') { 548 pri = 0; 549 while (isdigit(*++p)) 550 pri = 10 * pri + (*p - '0'); 551 if (*p == '>') 552 ++p; 553 } 554 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 555 pri = DEFUPRI; 556 557 /* don't allow users to log kernel messages */ 558 if (LOG_FAC(pri) == LOG_KERN) 559 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 560 561 q = line; 562 563 while ((c = *p++ & 0177) != '\0' && 564 q < &line[sizeof(line) - 1]) 565 if (iscntrl(c)) 566 if (c == '\n') 567 *q++ = ' '; 568 else if (c == '\t') 569 *q++ = '\t'; 570 else { 571 *q++ = '^'; 572 *q++ = c ^ 0100; 573 } 574 else 575 *q++ = c; 576 *q = '\0'; 577 578 logmsg(pri, line, hname, 0); 579 } 580 581 /* 582 * Take a raw input line from /dev/klog, split and format similar to syslog(). 583 */ 584 void 585 printsys(msg) 586 char *msg; 587 { 588 int pri, flags; 589 char *p, *q; 590 591 for (p = msg; *p != '\0'; ) { 592 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 593 pri = DEFSPRI; 594 if (*p == '<') { 595 pri = 0; 596 while (isdigit(*++p)) 597 pri = 10 * pri + (*p - '0'); 598 if (*p == '>') 599 ++p; 600 } else { 601 /* kernel printf's come out on console */ 602 flags |= IGN_CONS; 603 } 604 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 605 pri = DEFSPRI; 606 for (q = p; *q != '\0' && *q != '\n'; q++); 607 if (*q != '\0') 608 *q++ = '\0'; 609 logmsg(pri, p, LocalHostName, flags); 610 p = q; 611 } 612 } 613 614 time_t now; 615 616 /* 617 * Log a message to the appropriate log files, users, etc. based on 618 * the priority. 619 */ 620 void 621 logmsg(pri, msg, from, flags) 622 int pri; 623 char *msg, *from; 624 int flags; 625 { 626 struct filed *f; 627 int i, fac, msglen, omask, prilev; 628 char *timestamp; 629 char prog[NAME_MAX+1]; 630 char buf[MAXLINE+1]; 631 632 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 633 pri, flags, from, msg); 634 635 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 636 637 /* 638 * Check to see if msg looks non-standard. 639 */ 640 msglen = strlen(msg); 641 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 642 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 643 flags |= ADDDATE; 644 645 (void)time(&now); 646 if (flags & ADDDATE) 647 timestamp = ctime(&now) + 4; 648 else { 649 timestamp = msg; 650 msg += 16; 651 msglen -= 16; 652 } 653 654 /* skip leading blanks */ 655 while(isspace(*msg)) { 656 msg++; 657 msglen--; 658 } 659 660 /* extract facility and priority level */ 661 if (flags & MARK) 662 fac = LOG_NFACILITIES; 663 else 664 fac = LOG_FAC(pri); 665 prilev = LOG_PRI(pri); 666 667 /* extract program name */ 668 for(i = 0; i < NAME_MAX; i++) { 669 if(!isalnum(msg[i])) 670 break; 671 prog[i] = msg[i]; 672 } 673 prog[i] = 0; 674 675 /* add kernel prefix for kernel messages */ 676 if (flags & ISKERNEL) { 677 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 678 msg = buf; 679 msglen = strlen(buf); 680 } 681 682 /* log the message to the particular outputs */ 683 if (!Initialized) { 684 f = &consfile; 685 f->f_file = open(ctty, O_WRONLY, 0); 686 687 if (f->f_file >= 0) { 688 fprintlog(f, flags, msg); 689 (void)close(f->f_file); 690 } 691 (void)sigsetmask(omask); 692 return; 693 } 694 for (f = Files; f; f = f->f_next) { 695 /* skip messages that are incorrect priority */ 696 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 697 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 698 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 699 ) 700 || f->f_pmask[fac] == INTERNAL_NOPRI) 701 continue; 702 /* skip messages with the incorrect program name */ 703 if(f->f_program) 704 if(strcmp(prog, f->f_program) != 0) 705 continue; 706 707 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 708 continue; 709 710 /* don't output marks to recently written files */ 711 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 712 continue; 713 714 /* 715 * suppress duplicate lines to this file 716 */ 717 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 718 !strcmp(msg, f->f_prevline) && 719 !strcmp(from, f->f_prevhost)) { 720 (void)strncpy(f->f_lasttime, timestamp, 15); 721 f->f_prevcount++; 722 dprintf("msg repeated %d times, %ld sec of %d\n", 723 f->f_prevcount, (long)(now - f->f_time), 724 repeatinterval[f->f_repeatcount]); 725 /* 726 * If domark would have logged this by now, 727 * flush it now (so we don't hold isolated messages), 728 * but back off so we'll flush less often 729 * in the future. 730 */ 731 if (now > REPEATTIME(f)) { 732 fprintlog(f, flags, (char *)NULL); 733 BACKOFF(f); 734 } 735 } else { 736 /* new line, save it */ 737 if (f->f_prevcount) 738 fprintlog(f, 0, (char *)NULL); 739 f->f_repeatcount = 0; 740 f->f_prevpri = pri; 741 (void)strncpy(f->f_lasttime, timestamp, 15); 742 (void)strncpy(f->f_prevhost, from, 743 sizeof(f->f_prevhost)); 744 if (msglen < MAXSVLINE) { 745 f->f_prevlen = msglen; 746 (void)strcpy(f->f_prevline, msg); 747 fprintlog(f, flags, (char *)NULL); 748 } else { 749 f->f_prevline[0] = 0; 750 f->f_prevlen = 0; 751 fprintlog(f, flags, msg); 752 } 753 } 754 } 755 (void)sigsetmask(omask); 756 } 757 758 void 759 fprintlog(f, flags, msg) 760 struct filed *f; 761 int flags; 762 char *msg; 763 { 764 struct iovec iov[7]; 765 struct iovec *v; 766 int l; 767 char line[MAXLINE + 1], repbuf[80], greetings[200]; 768 char *msgret; 769 770 v = iov; 771 if (f->f_type == F_WALL) { 772 v->iov_base = greetings; 773 v->iov_len = snprintf(greetings, sizeof greetings, 774 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 775 f->f_prevhost, ctime(&now)); 776 v++; 777 v->iov_base = ""; 778 v->iov_len = 0; 779 v++; 780 } else { 781 v->iov_base = f->f_lasttime; 782 v->iov_len = 15; 783 v++; 784 v->iov_base = " "; 785 v->iov_len = 1; 786 v++; 787 } 788 789 if (LogFacPri) { 790 static char fp_buf[30]; /* Hollow laugh */ 791 int fac = f->f_prevpri & LOG_FACMASK; 792 int pri = LOG_PRI(f->f_prevpri); 793 char *f_s = 0; 794 char f_n[5]; /* Hollow laugh */ 795 char *p_s = 0; 796 char p_n[5]; /* Hollow laugh */ 797 798 if (LogFacPri > 1) { 799 CODE *c; 800 801 for (c = facilitynames; c; c++) { 802 if (c->c_val == fac) { 803 f_s = c->c_name; 804 break; 805 } 806 } 807 for (c = prioritynames; c; c++) { 808 if (c->c_val == pri) { 809 p_s = c->c_name; 810 break; 811 } 812 } 813 } 814 if (!f_s) { 815 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 816 f_s = f_n; 817 } 818 if (!p_s) { 819 snprintf(p_n, sizeof p_n, "%d", pri); 820 p_s = p_n; 821 } 822 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 823 v->iov_base = fp_buf; 824 v->iov_len = strlen(fp_buf); 825 } else { 826 v->iov_base=""; 827 v->iov_len = 0; 828 } 829 v++; 830 831 v->iov_base = f->f_prevhost; 832 v->iov_len = strlen(v->iov_base); 833 v++; 834 v->iov_base = " "; 835 v->iov_len = 1; 836 v++; 837 838 if (msg) { 839 v->iov_base = msg; 840 v->iov_len = strlen(msg); 841 } else if (f->f_prevcount > 1) { 842 v->iov_base = repbuf; 843 v->iov_len = sprintf(repbuf, "last message repeated %d times", 844 f->f_prevcount); 845 } else { 846 v->iov_base = f->f_prevline; 847 v->iov_len = f->f_prevlen; 848 } 849 v++; 850 851 dprintf("Logging to %s", TypeNames[f->f_type]); 852 f->f_time = now; 853 854 switch (f->f_type) { 855 case F_UNUSED: 856 dprintf("\n"); 857 break; 858 859 case F_FORW: 860 dprintf(" %s\n", f->f_un.f_forw.f_hname); 861 /* check for local vs remote messages */ 862 if (strcmp(f->f_prevhost, LocalHostName)) 863 l = snprintf(line, sizeof line - 1, 864 "<%d>%.15s Forwarded from %s: %s", 865 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 866 iov[5].iov_base); 867 else 868 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 869 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 870 if (l > MAXLINE) 871 l = MAXLINE; 872 if ((finet >= 0) && 873 (sendto(finet, line, l, 0, 874 (struct sockaddr *)&f->f_un.f_forw.f_addr, 875 sizeof(f->f_un.f_forw.f_addr)) != l)) { 876 int e = errno; 877 (void)close(f->f_file); 878 f->f_type = F_UNUSED; 879 errno = e; 880 logerror("sendto"); 881 } 882 break; 883 884 case F_FILE: 885 dprintf(" %s\n", f->f_un.f_fname); 886 v->iov_base = "\n"; 887 v->iov_len = 1; 888 if (writev(f->f_file, iov, 7) < 0) { 889 int e = errno; 890 (void)close(f->f_file); 891 f->f_type = F_UNUSED; 892 errno = e; 893 logerror(f->f_un.f_fname); 894 } else if (flags & SYNC_FILE) 895 (void)fsync(f->f_file); 896 break; 897 898 case F_PIPE: 899 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 900 v->iov_base = "\n"; 901 v->iov_len = 1; 902 if (f->f_un.f_pipe.f_pid == 0) { 903 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 904 &f->f_un.f_pipe.f_pid)) < 0) { 905 f->f_type = F_UNUSED; 906 logerror(f->f_un.f_pipe.f_pname); 907 break; 908 } 909 } 910 if (writev(f->f_file, iov, 7) < 0) { 911 int e = errno; 912 (void)close(f->f_file); 913 if (f->f_un.f_pipe.f_pid > 0) 914 deadq_enter(f->f_un.f_pipe.f_pid); 915 f->f_un.f_pipe.f_pid = 0; 916 errno = e; 917 logerror(f->f_un.f_pipe.f_pname); 918 } 919 break; 920 921 case F_CONSOLE: 922 if (flags & IGN_CONS) { 923 dprintf(" (ignored)\n"); 924 break; 925 } 926 /* FALLTHROUGH */ 927 928 case F_TTY: 929 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 930 v->iov_base = "\r\n"; 931 v->iov_len = 2; 932 933 errno = 0; /* ttymsg() only sometimes returns an errno */ 934 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 935 f->f_type = F_UNUSED; 936 logerror(msgret); 937 } 938 break; 939 940 case F_USERS: 941 case F_WALL: 942 dprintf("\n"); 943 v->iov_base = "\r\n"; 944 v->iov_len = 2; 945 wallmsg(f, iov); 946 break; 947 } 948 f->f_prevcount = 0; 949 } 950 951 /* 952 * WALLMSG -- Write a message to the world at large 953 * 954 * Write the specified message to either the entire 955 * world, or a list of approved users. 956 */ 957 void 958 wallmsg(f, iov) 959 struct filed *f; 960 struct iovec *iov; 961 { 962 static int reenter; /* avoid calling ourselves */ 963 FILE *uf; 964 struct utmp ut; 965 int i; 966 char *p; 967 char line[sizeof(ut.ut_line) + 1]; 968 969 if (reenter++) 970 return; 971 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 972 logerror(_PATH_UTMP); 973 reenter = 0; 974 return; 975 } 976 /* NOSTRICT */ 977 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 978 if (ut.ut_name[0] == '\0') 979 continue; 980 strncpy(line, ut.ut_line, sizeof(ut.ut_line)); 981 line[sizeof(ut.ut_line)] = '\0'; 982 if (f->f_type == F_WALL) { 983 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 984 errno = 0; /* already in msg */ 985 logerror(p); 986 } 987 continue; 988 } 989 /* should we send the message to this user? */ 990 for (i = 0; i < MAXUNAMES; i++) { 991 if (!f->f_un.f_uname[i][0]) 992 break; 993 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 994 UT_NAMESIZE)) { 995 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 996 != NULL) { 997 errno = 0; /* already in msg */ 998 logerror(p); 999 } 1000 break; 1001 } 1002 } 1003 } 1004 (void)fclose(uf); 1005 reenter = 0; 1006 } 1007 1008 void 1009 reapchild(signo) 1010 int signo; 1011 { 1012 int status, code; 1013 pid_t pid; 1014 struct filed *f; 1015 char buf[256]; 1016 const char *reason; 1017 dq_t q; 1018 1019 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1020 if (!Initialized) 1021 /* Don't tell while we are initting. */ 1022 continue; 1023 1024 /* First, look if it's a process from the dead queue. */ 1025 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1026 if (q->dq_pid == pid) { 1027 TAILQ_REMOVE(&deadq_head, q, dq_entries); 1028 free(q); 1029 goto oncemore; 1030 } 1031 1032 /* Now, look in list of active processes. */ 1033 for (f = Files; f; f = f->f_next) 1034 if (f->f_type == F_PIPE && 1035 f->f_un.f_pipe.f_pid == pid) { 1036 (void)close(f->f_file); 1037 1038 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 1039 f->f_un.f_pipe.f_pid = 0; 1040 if (WIFSIGNALED(status)) { 1041 reason = "due to signal"; 1042 code = WTERMSIG(status); 1043 } else { 1044 reason = "with status"; 1045 code = WEXITSTATUS(status); 1046 if (code == 0) 1047 goto oncemore; /* Exited OK. */ 1048 } 1049 (void)snprintf(buf, sizeof buf, 1050 "Logging subprocess %d (%s) exited %s %d.", 1051 pid, f->f_un.f_pipe.f_pname, 1052 reason, code); 1053 logerror(buf); 1054 break; 1055 } 1056 oncemore: 1057 } 1058 } 1059 1060 /* 1061 * Return a printable representation of a host address. 1062 */ 1063 char * 1064 cvthname(f) 1065 struct sockaddr_in *f; 1066 { 1067 struct hostent *hp; 1068 char *p; 1069 1070 dprintf("cvthname(%s)\n", inet_ntoa(f->sin_addr)); 1071 1072 if (f->sin_family != AF_INET) { 1073 dprintf("Malformed from address\n"); 1074 return ("???"); 1075 } 1076 hp = gethostbyaddr((char *)&f->sin_addr, 1077 sizeof(struct in_addr), f->sin_family); 1078 if (hp == 0) { 1079 dprintf("Host name for your address (%s) unknown\n", 1080 inet_ntoa(f->sin_addr)); 1081 return (inet_ntoa(f->sin_addr)); 1082 } 1083 if ((p = strchr(hp->h_name, '.')) && strcmp(p + 1, LocalDomain) == 0) 1084 *p = '\0'; 1085 return (hp->h_name); 1086 } 1087 1088 void 1089 domark(signo) 1090 int signo; 1091 { 1092 struct filed *f; 1093 dq_t q; 1094 1095 now = time((time_t *)NULL); 1096 MarkSeq += TIMERINTVL; 1097 if (MarkSeq >= MarkInterval) { 1098 logmsg(LOG_INFO, "-- MARK --", LocalHostName, ADDDATE|MARK); 1099 MarkSeq = 0; 1100 } 1101 1102 for (f = Files; f; f = f->f_next) { 1103 if (f->f_prevcount && now >= REPEATTIME(f)) { 1104 dprintf("flush %s: repeated %d times, %d sec.\n", 1105 TypeNames[f->f_type], f->f_prevcount, 1106 repeatinterval[f->f_repeatcount]); 1107 fprintlog(f, 0, (char *)NULL); 1108 BACKOFF(f); 1109 } 1110 } 1111 1112 /* Walk the dead queue, and see if we should signal somebody. */ 1113 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1114 switch (q->dq_timeout) { 1115 case 0: 1116 /* Already signalled once, try harder now. */ 1117 kill(q->dq_pid, SIGKILL); 1118 break; 1119 1120 case 1: 1121 /* 1122 * Timed out on dead queue, send terminate 1123 * signal. Note that we leave the removal 1124 * from the dead queue to reapchild(), which 1125 * will also log the event. 1126 */ 1127 kill(q->dq_pid, SIGTERM); 1128 /* FALLTROUGH */ 1129 1130 default: 1131 q->dq_timeout--; 1132 } 1133 1134 (void)alarm(TIMERINTVL); 1135 } 1136 1137 /* 1138 * Print syslogd errors some place. 1139 */ 1140 void 1141 logerror(type) 1142 const char *type; 1143 { 1144 char buf[512]; 1145 1146 if (errno) 1147 (void)snprintf(buf, 1148 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1149 else 1150 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1151 errno = 0; 1152 dprintf("%s\n", buf); 1153 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1154 } 1155 1156 void 1157 die(signo) 1158 int signo; 1159 { 1160 struct filed *f; 1161 int was_initialized; 1162 char buf[100]; 1163 int i; 1164 1165 was_initialized = Initialized; 1166 Initialized = 0; /* Don't log SIGCHLDs. */ 1167 for (f = Files; f != NULL; f = f->f_next) { 1168 /* flush any pending output */ 1169 if (f->f_prevcount) 1170 fprintlog(f, 0, (char *)NULL); 1171 if (f->f_type == F_PIPE) 1172 (void)close(f->f_file); 1173 } 1174 Initialized = was_initialized; 1175 if (signo) { 1176 dprintf("syslogd: exiting on signal %d\n", signo); 1177 (void)sprintf(buf, "exiting on signal %d", signo); 1178 errno = 0; 1179 logerror(buf); 1180 } 1181 for (i = 0; i < nfunix; i++) 1182 if (funixn[i] && funix[i] != -1) 1183 (void)unlink(funixn[i]); 1184 exit(1); 1185 } 1186 1187 /* 1188 * INIT -- Initialize syslogd from configuration table 1189 */ 1190 void 1191 init(signo) 1192 int signo; 1193 { 1194 int i; 1195 FILE *cf; 1196 struct filed *f, *next, **nextp; 1197 char *p; 1198 char cline[LINE_MAX]; 1199 char prog[NAME_MAX+1]; 1200 1201 dprintf("init\n"); 1202 1203 /* 1204 * Close all open log files. 1205 */ 1206 Initialized = 0; 1207 for (f = Files; f != NULL; f = next) { 1208 /* flush any pending output */ 1209 if (f->f_prevcount) 1210 fprintlog(f, 0, (char *)NULL); 1211 1212 switch (f->f_type) { 1213 case F_FILE: 1214 case F_FORW: 1215 case F_CONSOLE: 1216 case F_TTY: 1217 (void)close(f->f_file); 1218 break; 1219 case F_PIPE: 1220 (void)close(f->f_file); 1221 if (f->f_un.f_pipe.f_pid > 0) 1222 deadq_enter(f->f_un.f_pipe.f_pid); 1223 f->f_un.f_pipe.f_pid = 0; 1224 break; 1225 } 1226 next = f->f_next; 1227 if(f->f_program) free(f->f_program); 1228 free((char *)f); 1229 } 1230 Files = NULL; 1231 nextp = &Files; 1232 1233 /* open the configuration file */ 1234 if ((cf = fopen(ConfFile, "r")) == NULL) { 1235 dprintf("cannot open %s\n", ConfFile); 1236 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1237 cfline("*.ERR\t/dev/console", *nextp, "*"); 1238 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1239 cfline("*.PANIC\t*", (*nextp)->f_next, "*"); 1240 Initialized = 1; 1241 return; 1242 } 1243 1244 /* 1245 * Foreach line in the conf table, open that file. 1246 */ 1247 f = NULL; 1248 strcpy(prog, "*"); 1249 while (fgets(cline, sizeof(cline), cf) != NULL) { 1250 /* 1251 * check for end-of-section, comments, strip off trailing 1252 * spaces and newline character. #!prog is treated specially: 1253 * following lines apply only to that program. 1254 */ 1255 for (p = cline; isspace(*p); ++p) 1256 continue; 1257 if (*p == 0) 1258 continue; 1259 if(*p == '#') { 1260 p++; 1261 if(*p!='!') 1262 continue; 1263 } 1264 if(*p=='!') { 1265 p++; 1266 while(isspace(*p)) p++; 1267 if(!*p) { 1268 strcpy(prog, "*"); 1269 continue; 1270 } 1271 for(i = 0; i < NAME_MAX; i++) { 1272 if(!isalnum(p[i])) 1273 break; 1274 prog[i] = p[i]; 1275 } 1276 prog[i] = 0; 1277 continue; 1278 } 1279 for (p = strchr(cline, '\0'); isspace(*--p);) 1280 continue; 1281 *++p = '\0'; 1282 f = (struct filed *)calloc(1, sizeof(*f)); 1283 *nextp = f; 1284 nextp = &f->f_next; 1285 cfline(cline, f, prog); 1286 } 1287 1288 /* close the configuration file */ 1289 (void)fclose(cf); 1290 1291 Initialized = 1; 1292 1293 if (Debug) { 1294 for (f = Files; f; f = f->f_next) { 1295 for (i = 0; i <= LOG_NFACILITIES; i++) 1296 if (f->f_pmask[i] == INTERNAL_NOPRI) 1297 printf("X "); 1298 else 1299 printf("%d ", f->f_pmask[i]); 1300 printf("%s: ", TypeNames[f->f_type]); 1301 switch (f->f_type) { 1302 case F_FILE: 1303 printf("%s", f->f_un.f_fname); 1304 break; 1305 1306 case F_CONSOLE: 1307 case F_TTY: 1308 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1309 break; 1310 1311 case F_FORW: 1312 printf("%s", f->f_un.f_forw.f_hname); 1313 break; 1314 1315 case F_PIPE: 1316 printf("%s", f->f_un.f_pipe.f_pname); 1317 break; 1318 1319 case F_USERS: 1320 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1321 printf("%s, ", f->f_un.f_uname[i]); 1322 break; 1323 } 1324 if(f->f_program) { 1325 printf(" (%s)", f->f_program); 1326 } 1327 printf("\n"); 1328 } 1329 } 1330 1331 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1332 dprintf("syslogd: restarted\n"); 1333 } 1334 1335 /* 1336 * Crack a configuration file line 1337 */ 1338 void 1339 cfline(line, f, prog) 1340 char *line; 1341 struct filed *f; 1342 char *prog; 1343 { 1344 struct hostent *hp; 1345 int i, pri; 1346 char *bp, *p, *q; 1347 char buf[MAXLINE], ebuf[100]; 1348 1349 dprintf("cfline(\"%s\", f, \"%s\")\n", line, prog); 1350 1351 errno = 0; /* keep strerror() stuff out of logerror messages */ 1352 1353 /* clear out file entry */ 1354 memset(f, 0, sizeof(*f)); 1355 for (i = 0; i <= LOG_NFACILITIES; i++) 1356 f->f_pmask[i] = INTERNAL_NOPRI; 1357 1358 /* save program name if any */ 1359 if(prog && *prog=='*') prog = NULL; 1360 if(prog) { 1361 f->f_program = calloc(1, strlen(prog)+1); 1362 if(f->f_program) { 1363 strcpy(f->f_program, prog); 1364 } 1365 } 1366 1367 /* scan through the list of selectors */ 1368 for (p = line; *p && *p != '\t';) { 1369 int pri_done; 1370 int pri_cmp; 1371 1372 /* find the end of this facility name list */ 1373 for (q = p; *q && *q != '\t' && *q++ != '.'; ) 1374 continue; 1375 1376 /* get the priority comparison */ 1377 pri_cmp = 0; 1378 pri_done = 0; 1379 while (!pri_done) { 1380 switch (*q) { 1381 case '<': 1382 pri_cmp |= PRI_LT; 1383 q++; 1384 break; 1385 case '=': 1386 pri_cmp |= PRI_EQ; 1387 q++; 1388 break; 1389 case '>': 1390 pri_cmp |= PRI_GT; 1391 q++; 1392 break; 1393 default: 1394 pri_done++; 1395 break; 1396 } 1397 } 1398 if (!pri_cmp) 1399 pri_cmp = (UniquePriority) 1400 ? (PRI_EQ) 1401 : (PRI_EQ | PRI_GT) 1402 ; 1403 1404 /* collect priority name */ 1405 for (bp = buf; *q && !strchr("\t,;", *q); ) 1406 *bp++ = *q++; 1407 *bp = '\0'; 1408 1409 /* skip cruft */ 1410 while (strchr(", ;", *q)) 1411 q++; 1412 1413 /* decode priority name */ 1414 if (*buf == '*') 1415 pri = LOG_PRIMASK + 1; 1416 else { 1417 pri = decode(buf, prioritynames); 1418 if (pri < 0) { 1419 (void)snprintf(ebuf, sizeof ebuf, 1420 "unknown priority name \"%s\"", buf); 1421 logerror(ebuf); 1422 return; 1423 } 1424 } 1425 1426 /* scan facilities */ 1427 while (*p && !strchr("\t.;", *p)) { 1428 for (bp = buf; *p && !strchr("\t,;.", *p); ) 1429 *bp++ = *p++; 1430 *bp = '\0'; 1431 1432 if (*buf == '*') 1433 for (i = 0; i < LOG_NFACILITIES; i++) { 1434 f->f_pmask[i] = pri; 1435 f->f_pcmp[i] = pri_cmp; 1436 } 1437 else { 1438 i = decode(buf, facilitynames); 1439 if (i < 0) { 1440 (void)snprintf(ebuf, sizeof ebuf, 1441 "unknown facility name \"%s\"", 1442 buf); 1443 logerror(ebuf); 1444 return; 1445 } 1446 f->f_pmask[i >> 3] = pri; 1447 f->f_pcmp[i >> 3] = pri_cmp; 1448 } 1449 while (*p == ',' || *p == ' ') 1450 p++; 1451 } 1452 1453 p = q; 1454 } 1455 1456 /* skip to action part */ 1457 while (*p == '\t') 1458 p++; 1459 1460 switch (*p) 1461 { 1462 case '@': 1463 (void)strcpy(f->f_un.f_forw.f_hname, ++p); 1464 hp = gethostbyname(p); 1465 if (hp == NULL) { 1466 extern int h_errno; 1467 1468 logerror(hstrerror(h_errno)); 1469 break; 1470 } 1471 memset(&f->f_un.f_forw.f_addr, 0, 1472 sizeof(f->f_un.f_forw.f_addr)); 1473 f->f_un.f_forw.f_addr.sin_family = AF_INET; 1474 f->f_un.f_forw.f_addr.sin_port = LogPort; 1475 memmove(&f->f_un.f_forw.f_addr.sin_addr, hp->h_addr, hp->h_length); 1476 f->f_type = F_FORW; 1477 break; 1478 1479 case '/': 1480 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1481 f->f_type = F_UNUSED; 1482 logerror(p); 1483 break; 1484 } 1485 if (isatty(f->f_file)) { 1486 if (strcmp(p, ctty) == 0) 1487 f->f_type = F_CONSOLE; 1488 else 1489 f->f_type = F_TTY; 1490 (void)strcpy(f->f_un.f_fname, p + sizeof _PATH_DEV - 1); 1491 } else { 1492 (void)strcpy(f->f_un.f_fname, p); 1493 f->f_type = F_FILE; 1494 } 1495 break; 1496 1497 case '|': 1498 f->f_un.f_pipe.f_pid = 0; 1499 (void)strcpy(f->f_un.f_pipe.f_pname, p + 1); 1500 f->f_type = F_PIPE; 1501 break; 1502 1503 case '*': 1504 f->f_type = F_WALL; 1505 break; 1506 1507 default: 1508 for (i = 0; i < MAXUNAMES && *p; i++) { 1509 for (q = p; *q && *q != ','; ) 1510 q++; 1511 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1512 if ((q - p) > UT_NAMESIZE) 1513 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1514 else 1515 f->f_un.f_uname[i][q - p] = '\0'; 1516 while (*q == ',' || *q == ' ') 1517 q++; 1518 p = q; 1519 } 1520 f->f_type = F_USERS; 1521 break; 1522 } 1523 } 1524 1525 1526 /* 1527 * Decode a symbolic name to a numeric value 1528 */ 1529 int 1530 decode(name, codetab) 1531 const char *name; 1532 CODE *codetab; 1533 { 1534 CODE *c; 1535 char *p, buf[40]; 1536 1537 if (isdigit(*name)) 1538 return (atoi(name)); 1539 1540 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1541 if (isupper(*name)) 1542 *p = tolower(*name); 1543 else 1544 *p = *name; 1545 } 1546 *p = '\0'; 1547 for (c = codetab; c->c_name; c++) 1548 if (!strcmp(buf, c->c_name)) 1549 return (c->c_val); 1550 1551 return (-1); 1552 } 1553 1554 /* 1555 * fork off and become a daemon, but wait for the child to come online 1556 * before returing to the parent, or we get disk thrashing at boot etc. 1557 * Set a timer so we don't hang forever if it wedges. 1558 */ 1559 int 1560 waitdaemon(nochdir, noclose, maxwait) 1561 int nochdir, noclose, maxwait; 1562 { 1563 int fd; 1564 int status; 1565 pid_t pid, childpid; 1566 1567 switch (childpid = fork()) { 1568 case -1: 1569 return (-1); 1570 case 0: 1571 break; 1572 default: 1573 signal(SIGALRM, timedout); 1574 alarm(maxwait); 1575 while ((pid = wait3(&status, 0, NULL)) != -1) { 1576 if (WIFEXITED(status)) 1577 errx(1, "child pid %d exited with return code %d", 1578 pid, WEXITSTATUS(status)); 1579 if (WIFSIGNALED(status)) 1580 errx(1, "child pid %d exited on signal %d%s", 1581 pid, WTERMSIG(status), 1582 WCOREDUMP(status) ? " (core dumped)" : 1583 ""); 1584 if (pid == childpid) /* it's gone... */ 1585 break; 1586 } 1587 exit(0); 1588 } 1589 1590 if (setsid() == -1) 1591 return (-1); 1592 1593 if (!nochdir) 1594 (void)chdir("/"); 1595 1596 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1597 (void)dup2(fd, STDIN_FILENO); 1598 (void)dup2(fd, STDOUT_FILENO); 1599 (void)dup2(fd, STDERR_FILENO); 1600 if (fd > 2) 1601 (void)close (fd); 1602 } 1603 return (getppid()); 1604 } 1605 1606 /* 1607 * We get a SIGALRM from the child when it's running and finished doing it's 1608 * fsync()'s or O_SYNC writes for all the boot messages. 1609 * 1610 * We also get a signal from the kernel if the timer expires, so check to 1611 * see what happened. 1612 */ 1613 void 1614 timedout(sig) 1615 int sig __unused; 1616 { 1617 int left; 1618 left = alarm(0); 1619 signal(SIGALRM, SIG_DFL); 1620 if (left == 0) 1621 errx(1, "timed out waiting for child"); 1622 else 1623 exit(0); 1624 } 1625 1626 /* 1627 * Add `s' to the list of allowable peer addresses to accept messages 1628 * from. 1629 * 1630 * `s' is a string in the form: 1631 * 1632 * [*]domainname[:{servicename|portnumber|*}] 1633 * 1634 * or 1635 * 1636 * netaddr/maskbits[:{servicename|portnumber|*}] 1637 * 1638 * Returns -1 on error, 0 if the argument was valid. 1639 */ 1640 int 1641 allowaddr(s) 1642 char *s; 1643 { 1644 char *cp1, *cp2; 1645 struct allowedpeer ap; 1646 struct servent *se; 1647 regex_t re; 1648 int i; 1649 1650 if ((cp1 = strrchr(s, ':'))) { 1651 /* service/port provided */ 1652 *cp1++ = '\0'; 1653 if (strlen(cp1) == 1 && *cp1 == '*') 1654 /* any port allowed */ 1655 ap.port = htons(0); 1656 else if ((se = getservbyname(cp1, "udp"))) 1657 ap.port = se->s_port; 1658 else { 1659 ap.port = htons((int)strtol(cp1, &cp2, 0)); 1660 if (*cp2 != '\0') 1661 return -1; /* port not numeric */ 1662 } 1663 } else { 1664 if ((se = getservbyname("syslog", "udp"))) 1665 ap.port = se->s_port; 1666 else 1667 /* sanity, should not happen */ 1668 ap.port = htons(514); 1669 } 1670 1671 /* the regexp's are ugly, but the cleanest way */ 1672 1673 if (regcomp(&re, "^[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+(/[0-9]+)?$", 1674 REG_EXTENDED)) 1675 /* if RE compilation fails, that's an internal error */ 1676 abort(); 1677 if (regexec(&re, s, 0, 0, 0) == 0) { 1678 /* arg `s' is numeric */ 1679 ap.isnumeric = 1; 1680 if ((cp1 = strchr(s, '/')) != NULL) { 1681 *cp1++ = '\0'; 1682 i = atoi(cp1); 1683 if (i < 0 || i > 32) 1684 return -1; 1685 /* convert masklen to netmask */ 1686 ap.a_mask.s_addr = htonl(~((1 << (32 - i)) - 1)); 1687 } 1688 if (ascii2addr(AF_INET, s, &ap.a_addr) == -1) 1689 return -1; 1690 if (cp1 == NULL) { 1691 /* use default netmask */ 1692 if (IN_CLASSA(ntohl(ap.a_addr.s_addr))) 1693 ap.a_mask.s_addr = htonl(IN_CLASSA_NET); 1694 else if (IN_CLASSB(ntohl(ap.a_addr.s_addr))) 1695 ap.a_mask.s_addr = htonl(IN_CLASSB_NET); 1696 else 1697 ap.a_mask.s_addr = htonl(IN_CLASSC_NET); 1698 } 1699 } else { 1700 /* arg `s' is domain name */ 1701 ap.isnumeric = 0; 1702 ap.a_name = s; 1703 } 1704 regfree(&re); 1705 1706 if (Debug) { 1707 printf("allowaddr: rule %d: ", NumAllowed); 1708 if (ap.isnumeric) { 1709 printf("numeric, "); 1710 printf("addr = %s, ", 1711 addr2ascii(AF_INET, &ap.a_addr, sizeof(struct in_addr), 0)); 1712 printf("mask = %s; ", 1713 addr2ascii(AF_INET, &ap.a_mask, sizeof(struct in_addr), 0)); 1714 } else 1715 printf("domainname = %s; ", ap.a_name); 1716 printf("port = %d\n", ntohs(ap.port)); 1717 } 1718 1719 if ((AllowedPeers = realloc(AllowedPeers, 1720 ++NumAllowed * sizeof(struct allowedpeer))) 1721 == NULL) { 1722 fprintf(stderr, "Out of memory!\n"); 1723 exit(EX_OSERR); 1724 } 1725 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 1726 return 0; 1727 } 1728 1729 /* 1730 * Validate that the remote peer has permission to log to us. 1731 */ 1732 int 1733 validate(sin, hname) 1734 struct sockaddr_in *sin; 1735 const char *hname; 1736 { 1737 int i; 1738 size_t l1, l2; 1739 char *cp, name[MAXHOSTNAMELEN]; 1740 struct allowedpeer *ap; 1741 1742 if (NumAllowed == 0) 1743 /* traditional behaviour, allow everything */ 1744 return 1; 1745 1746 strncpy(name, hname, sizeof name); 1747 if (strchr(name, '.') == NULL) { 1748 strncat(name, ".", sizeof name - strlen(name) - 1); 1749 strncat(name, LocalDomain, sizeof name - strlen(name) - 1); 1750 } 1751 dprintf("validate: dgram from IP %s, port %d, name %s;\n", 1752 addr2ascii(AF_INET, &sin->sin_addr, sizeof(struct in_addr), 0), 1753 ntohs(sin->sin_port), name); 1754 1755 /* now, walk down the list */ 1756 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 1757 if (ntohs(ap->port) != 0 && ap->port != sin->sin_port) { 1758 dprintf("rejected in rule %d due to port mismatch.\n", i); 1759 continue; 1760 } 1761 1762 if (ap->isnumeric) { 1763 if ((sin->sin_addr.s_addr & ap->a_mask.s_addr) 1764 != ap->a_addr.s_addr) { 1765 dprintf("rejected in rule %d due to IP mismatch.\n", i); 1766 continue; 1767 } 1768 } else { 1769 cp = ap->a_name; 1770 l1 = strlen(name); 1771 if (*cp == '*') { 1772 /* allow wildmatch */ 1773 cp++; 1774 l2 = strlen(cp); 1775 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 1776 dprintf("rejected in rule %d due to name mismatch.\n", i); 1777 continue; 1778 } 1779 } else { 1780 /* exact match */ 1781 l2 = strlen(cp); 1782 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 1783 dprintf("rejected in rule %d due to name mismatch.\n", i); 1784 continue; 1785 } 1786 } 1787 } 1788 dprintf("accepted in rule %d.\n", i); 1789 return 1; /* hooray! */ 1790 } 1791 return 0; 1792 } 1793 1794 /* 1795 * Fairly similar to popen(3), but returns an open descriptor, as 1796 * opposed to a FILE *. 1797 */ 1798 int 1799 p_open(prog, pid) 1800 char *prog; 1801 pid_t *pid; 1802 { 1803 int pfd[2], nulldesc, i; 1804 sigset_t omask, mask; 1805 char *argv[4]; /* sh -c cmd NULL */ 1806 char errmsg[200]; 1807 1808 if (pipe(pfd) == -1) 1809 return -1; 1810 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 1811 /* we are royally screwed anyway */ 1812 return -1; 1813 1814 sigemptyset(&mask); 1815 sigaddset(&mask, SIGALRM); 1816 sigaddset(&mask, SIGHUP); 1817 sigprocmask(SIG_BLOCK, &mask, &omask); 1818 switch ((*pid = fork())) { 1819 case -1: 1820 sigprocmask(SIG_SETMASK, &omask, 0); 1821 close(nulldesc); 1822 return -1; 1823 1824 case 0: 1825 argv[0] = "sh"; 1826 argv[1] = "-c"; 1827 argv[2] = prog; 1828 argv[3] = NULL; 1829 1830 alarm(0); 1831 (void)setsid(); /* Avoid catching SIGHUPs. */ 1832 1833 /* 1834 * Throw away pending signals, and reset signal 1835 * behaviour to standard values. 1836 */ 1837 signal(SIGALRM, SIG_IGN); 1838 signal(SIGHUP, SIG_IGN); 1839 sigprocmask(SIG_SETMASK, &omask, 0); 1840 signal(SIGPIPE, SIG_DFL); 1841 signal(SIGQUIT, SIG_DFL); 1842 signal(SIGALRM, SIG_DFL); 1843 signal(SIGHUP, SIG_DFL); 1844 1845 dup2(pfd[0], STDIN_FILENO); 1846 dup2(nulldesc, STDOUT_FILENO); 1847 dup2(nulldesc, STDERR_FILENO); 1848 for (i = getdtablesize(); i > 2; i--) 1849 (void) close(i); 1850 1851 (void) execvp(_PATH_BSHELL, argv); 1852 _exit(255); 1853 } 1854 1855 sigprocmask(SIG_SETMASK, &omask, 0); 1856 close(nulldesc); 1857 close(pfd[0]); 1858 /* 1859 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 1860 * supposed to get an EWOULDBLOCK on writev(2), which is 1861 * caught by the logic above anyway, which will in turn close 1862 * the pipe, and fork a new logging subprocess if necessary. 1863 * The stale subprocess will be killed some time later unless 1864 * it terminated itself due to closing its input pipe (so we 1865 * get rid of really dead puppies). 1866 */ 1867 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 1868 /* This is bad. */ 1869 (void)snprintf(errmsg, sizeof errmsg, 1870 "Warning: cannot change pipe to PID %d to " 1871 "non-blocking behaviour.", 1872 (int)*pid); 1873 logerror(errmsg); 1874 } 1875 return pfd[1]; 1876 } 1877 1878 void 1879 deadq_enter(pid) 1880 pid_t pid; 1881 { 1882 dq_t p; 1883 1884 p = malloc(sizeof(struct deadq_entry)); 1885 if (p == 0) { 1886 errno = 0; 1887 logerror("panic: out of virtual memory!"); 1888 exit(1); 1889 } 1890 1891 p->dq_pid = pid; 1892 p->dq_timeout = DQ_TIMO_INIT; 1893 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 1894 } 1895