1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 /* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximimum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 * Extension to log by program name as well as facility and priority 69 * by Peter da Silva. 70 * -u and -v by Harlan Stenn. 71 * Priority comparison code by Harlan Stenn. 72 */ 73 74 #define MAXLINE 1024 /* maximum line length */ 75 #define MAXSVLINE 120 /* maximum saved line length */ 76 #define DEFUPRI (LOG_USER|LOG_NOTICE) 77 #define DEFSPRI (LOG_KERN|LOG_CRIT) 78 #define TIMERINTVL 30 /* interval for checking flush, mark */ 79 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/stat.h> 84 #include <sys/wait.h> 85 #include <sys/socket.h> 86 #include <sys/queue.h> 87 #include <sys/uio.h> 88 #include <sys/un.h> 89 #include <sys/time.h> 90 #include <sys/resource.h> 91 #include <sys/syslimits.h> 92 #include <paths.h> 93 94 #include <netinet/in.h> 95 #include <netdb.h> 96 #include <arpa/inet.h> 97 98 #include <ctype.h> 99 #include <err.h> 100 #include <errno.h> 101 #include <fcntl.h> 102 #include <setjmp.h> 103 #include <signal.h> 104 #include <stdio.h> 105 #include <stdlib.h> 106 #include <string.h> 107 #include <sysexits.h> 108 #include <unistd.h> 109 #include <utmp.h> 110 111 #include "pathnames.h" 112 #include "ttymsg.h" 113 114 #define SYSLOG_NAMES 115 #include <sys/syslog.h> 116 117 #ifdef NI_WITHSCOPEID 118 static const int withscopeid = NI_WITHSCOPEID; 119 #else 120 static const int withscopeid = 0; 121 #endif 122 123 const char *ConfFile = _PATH_LOGCONF; 124 const char *PidFile = _PATH_LOGPID; 125 const char ctty[] = _PATH_CONSOLE; 126 127 #define dprintf if (Debug) printf 128 129 #define MAXUNAMES 20 /* maximum number of user names */ 130 131 #define MAXFUNIX 20 132 133 int nfunix = 1; 134 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 135 int funix[MAXFUNIX]; 136 137 /* 138 * Flags to logmsg(). 139 */ 140 141 #define IGN_CONS 0x001 /* don't print on console */ 142 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 143 #define ADDDATE 0x004 /* add a date to the message */ 144 #define MARK 0x008 /* this message is a mark */ 145 #define ISKERNEL 0x010 /* kernel generated message */ 146 147 /* 148 * This structure represents the files that will have log 149 * copies printed. 150 */ 151 152 struct filed { 153 struct filed *f_next; /* next in linked list */ 154 short f_type; /* entry type, see below */ 155 short f_file; /* file descriptor */ 156 time_t f_time; /* time this was last written */ 157 char *f_host; /* host from which to recd. */ 158 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 159 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 160 #define PRI_LT 0x1 161 #define PRI_EQ 0x2 162 #define PRI_GT 0x4 163 char *f_program; /* program this applies to */ 164 union { 165 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 166 struct { 167 char f_hname[MAXHOSTNAMELEN]; 168 struct addrinfo *f_addr; 169 170 } f_forw; /* forwarding address */ 171 char f_fname[MAXPATHLEN]; 172 struct { 173 char f_pname[MAXPATHLEN]; 174 pid_t f_pid; 175 } f_pipe; 176 } f_un; 177 char f_prevline[MAXSVLINE]; /* last message logged */ 178 char f_lasttime[16]; /* time of last occurrence */ 179 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 180 int f_prevpri; /* pri of f_prevline */ 181 int f_prevlen; /* length of f_prevline */ 182 int f_prevcount; /* repetition cnt of prevline */ 183 u_int f_repeatcount; /* number of "repeated" msgs */ 184 }; 185 186 /* 187 * Queue of about-to-be dead processes we should watch out for. 188 */ 189 190 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 191 struct stailhead *deadq_headp; 192 193 struct deadq_entry { 194 pid_t dq_pid; 195 int dq_timeout; 196 TAILQ_ENTRY(deadq_entry) dq_entries; 197 }; 198 199 /* 200 * The timeout to apply to processes waiting on the dead queue. Unit 201 * of measure is `mark intervals', i.e. 20 minutes by default. 202 * Processes on the dead queue will be terminated after that time. 203 */ 204 205 #define DQ_TIMO_INIT 2 206 207 typedef struct deadq_entry *dq_t; 208 209 210 /* 211 * Struct to hold records of network addresses that are allowed to log 212 * to us. 213 */ 214 struct allowedpeer { 215 int isnumeric; 216 u_short port; 217 union { 218 struct { 219 struct sockaddr_storage addr; 220 struct sockaddr_storage mask; 221 } numeric; 222 char *name; 223 } u; 224 #define a_addr u.numeric.addr 225 #define a_mask u.numeric.mask 226 #define a_name u.name 227 }; 228 229 230 /* 231 * Intervals at which we flush out "message repeated" messages, 232 * in seconds after previous message is logged. After each flush, 233 * we move to the next interval until we reach the largest. 234 */ 235 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 236 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 237 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 238 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 239 (f)->f_repeatcount = MAXREPEAT; \ 240 } 241 242 /* values for f_type */ 243 #define F_UNUSED 0 /* unused entry */ 244 #define F_FILE 1 /* regular file */ 245 #define F_TTY 2 /* terminal */ 246 #define F_CONSOLE 3 /* console terminal */ 247 #define F_FORW 4 /* remote machine */ 248 #define F_USERS 5 /* list of users */ 249 #define F_WALL 6 /* everyone logged on */ 250 #define F_PIPE 7 /* pipe to program */ 251 252 const char *TypeNames[8] = { 253 "UNUSED", "FILE", "TTY", "CONSOLE", 254 "FORW", "USERS", "WALL", "PIPE" 255 }; 256 257 struct filed *Files; 258 struct filed consfile; 259 260 int Debug; /* debug flag */ 261 int resolve = 1; /* resolve hostname */ 262 char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 263 const char *LocalDomain; /* our local domain name */ 264 int *finet = NULL; /* Internet datagram socket */ 265 int fklog = -1; /* /dev/klog */ 266 int Initialized = 0; /* set when we have initialized ourselves */ 267 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 268 int MarkSeq = 0; /* mark sequence number */ 269 int SecureMode = 0; /* when true, receive only unix domain socks */ 270 #ifdef INET6 271 int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 272 #else 273 int family = PF_INET; /* protocol family (IPv4 only) */ 274 #endif 275 int send_to_all = 0; /* send message to all IPv4/IPv6 addresses */ 276 277 char bootfile[MAXLINE+1]; /* booted kernel file */ 278 279 struct allowedpeer *AllowedPeers; 280 int NumAllowed = 0; /* # of AllowedPeer entries */ 281 282 int UniquePriority = 0; /* Only log specified priority? */ 283 int LogFacPri = 0; /* Put facility and priority in log message: */ 284 /* 0=no, 1=numeric, 2=names */ 285 int KeepKernFac = 0; /* Keep remotely logged kernel facility */ 286 287 volatile sig_atomic_t MarkSet, WantDie; 288 289 int allowaddr __P((char *)); 290 void cfline __P((const char *, struct filed *, const char *, const char *)); 291 const char *cvthname __P((struct sockaddr *)); 292 void deadq_enter __P((pid_t, const char *)); 293 int deadq_remove __P((pid_t)); 294 int decode __P((const char *, CODE *)); 295 void die __P((int)); 296 void dodie __P((int)); 297 void domark __P((int)); 298 void fprintlog __P((struct filed *, int, const char *)); 299 int* socksetup __P((int, const char *)); 300 void init __P((int)); 301 void logerror __P((const char *)); 302 void logmsg __P((int, const char *, const char *, int)); 303 void log_deadchild __P((pid_t, int, const char *)); 304 void markit __P((void)); 305 void printline __P((const char *, char *)); 306 void printsys __P((char *)); 307 int p_open __P((const char *, pid_t *)); 308 void readklog __P((void)); 309 void reapchild __P((int)); 310 static void usage __P((void)); 311 int validate __P((struct sockaddr *, const char *)); 312 static void unmapped __P((struct sockaddr *)); 313 void wallmsg __P((struct filed *, struct iovec *)); 314 int waitdaemon __P((int, int, int)); 315 void timedout __P((int)); 316 317 int 318 main(argc, argv) 319 int argc; 320 char *argv[]; 321 { 322 int ch, i, fdsrmax = 0, l; 323 struct sockaddr_un sunx, fromunix; 324 struct sockaddr_storage frominet; 325 fd_set *fdsr = NULL; 326 FILE *fp; 327 char line[MAXLINE + 1]; 328 const char *bindhostname, *hname; 329 struct timeval tv, *tvp; 330 struct sigaction sact; 331 sigset_t mask; 332 pid_t ppid = 1; 333 socklen_t len; 334 335 bindhostname = NULL; 336 while ((ch = getopt(argc, argv, "46Aa:b:df:kl:m:np:P:suv")) != -1) 337 switch (ch) { 338 case '4': 339 family = PF_INET; 340 break; 341 #ifdef INET6 342 case '6': 343 family = PF_INET6; 344 break; 345 #endif 346 case 'A': 347 send_to_all++; 348 break; 349 case 'a': /* allow specific network addresses only */ 350 if (allowaddr(optarg) == -1) 351 usage(); 352 break; 353 case 'b': 354 bindhostname = optarg; 355 break; 356 case 'd': /* debug */ 357 Debug++; 358 break; 359 case 'f': /* configuration file */ 360 ConfFile = optarg; 361 break; 362 case 'k': /* keep remote kern fac */ 363 KeepKernFac = 1; 364 break; 365 case 'l': 366 if (nfunix < MAXFUNIX) 367 funixn[nfunix++] = optarg; 368 else 369 warnx("out of descriptors, ignoring %s", 370 optarg); 371 break; 372 case 'm': /* mark interval */ 373 MarkInterval = atoi(optarg) * 60; 374 break; 375 case 'n': 376 resolve = 0; 377 break; 378 case 'p': /* path */ 379 funixn[0] = optarg; 380 break; 381 case 'P': /* path for alt. PID */ 382 PidFile = optarg; 383 break; 384 case 's': /* no network mode */ 385 SecureMode++; 386 break; 387 case 'u': /* only log specified priority */ 388 UniquePriority++; 389 break; 390 case 'v': /* log facility and priority */ 391 LogFacPri++; 392 break; 393 case '?': 394 default: 395 usage(); 396 } 397 if ((argc -= optind) != 0) 398 usage(); 399 400 if (!Debug) { 401 ppid = waitdaemon(0, 0, 30); 402 if (ppid < 0) 403 err(1, "could not become daemon"); 404 } else 405 setlinebuf(stdout); 406 407 if (NumAllowed) 408 endservent(); 409 410 consfile.f_type = F_CONSOLE; 411 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 412 sizeof(consfile.f_un.f_fname)); 413 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 414 (void)signal(SIGTERM, dodie); 415 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 416 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 417 /* 418 * We don't want the SIGCHLD and SIGHUP handlers to interfere 419 * with each other; they are likely candidates for being called 420 * simultaneously (SIGHUP closes pipe descriptor, process dies, 421 * SIGCHLD happens). 422 */ 423 sigemptyset(&mask); 424 sigaddset(&mask, SIGHUP); 425 sact.sa_handler = reapchild; 426 sact.sa_mask = mask; 427 sact.sa_flags = SA_RESTART; 428 (void)sigaction(SIGCHLD, &sact, NULL); 429 (void)signal(SIGALRM, domark); 430 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 431 (void)alarm(TIMERINTVL); 432 433 TAILQ_INIT(&deadq_head); 434 435 #ifndef SUN_LEN 436 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 437 #endif 438 for (i = 0; i < nfunix; i++) { 439 memset(&sunx, 0, sizeof(sunx)); 440 sunx.sun_family = AF_UNIX; 441 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 442 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 443 if (funix[i] < 0 || 444 bind(funix[i], (struct sockaddr *)&sunx, 445 SUN_LEN(&sunx)) < 0 || 446 chmod(funixn[i], 0666) < 0) { 447 (void) snprintf(line, sizeof line, 448 "cannot create %s", funixn[i]); 449 logerror(line); 450 dprintf("cannot create %s (%d)\n", funixn[i], errno); 451 if (i == 0) 452 die(0); 453 } 454 } 455 if (SecureMode <= 1) 456 finet = socksetup(family, bindhostname); 457 458 if (finet) { 459 if (SecureMode) { 460 for (i = 0; i < *finet; i++) { 461 if (shutdown(finet[i+1], SHUT_RD) < 0) { 462 logerror("shutdown"); 463 if (!Debug) 464 die(0); 465 } 466 } 467 } else 468 dprintf("listening on inet and/or inet6 socket\n"); 469 dprintf("sending on inet and/or inet6 socket\n"); 470 } 471 472 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 473 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 474 fklog = -1; 475 if (fklog < 0) 476 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 477 478 /* tuck my process id away */ 479 fp = fopen(PidFile, "w"); 480 if (fp != NULL) { 481 fprintf(fp, "%d\n", getpid()); 482 (void) fclose(fp); 483 } 484 485 dprintf("off & running....\n"); 486 487 init(0); 488 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 489 sigemptyset(&mask); 490 sigaddset(&mask, SIGCHLD); 491 sact.sa_handler = init; 492 sact.sa_mask = mask; 493 sact.sa_flags = SA_RESTART; 494 (void)sigaction(SIGHUP, &sact, NULL); 495 496 tvp = &tv; 497 tv.tv_sec = tv.tv_usec = 0; 498 499 if (fklog != -1 && fklog > fdsrmax) 500 fdsrmax = fklog; 501 if (finet && !SecureMode) { 502 for (i = 0; i < *finet; i++) { 503 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 504 fdsrmax = finet[i+1]; 505 } 506 } 507 for (i = 0; i < nfunix; i++) { 508 if (funix[i] != -1 && funix[i] > fdsrmax) 509 fdsrmax = funix[i]; 510 } 511 512 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 513 sizeof(fd_mask)); 514 if (fdsr == NULL) 515 errx(1, "calloc fd_set"); 516 517 for (;;) { 518 if (MarkSet) 519 markit(); 520 if (WantDie) 521 die(WantDie); 522 523 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 524 sizeof(fd_mask)); 525 526 if (fklog != -1) 527 FD_SET(fklog, fdsr); 528 if (finet && !SecureMode) { 529 for (i = 0; i < *finet; i++) { 530 if (finet[i+1] != -1) 531 FD_SET(finet[i+1], fdsr); 532 } 533 } 534 for (i = 0; i < nfunix; i++) { 535 if (funix[i] != -1) 536 FD_SET(funix[i], fdsr); 537 } 538 539 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 540 switch (i) { 541 case 0: 542 if (tvp) { 543 tvp = NULL; 544 if (ppid != 1) 545 kill(ppid, SIGALRM); 546 } 547 continue; 548 case -1: 549 if (errno != EINTR) 550 logerror("select"); 551 continue; 552 } 553 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 554 readklog(); 555 if (finet && !SecureMode) { 556 for (i = 0; i < *finet; i++) { 557 if (FD_ISSET(finet[i+1], fdsr)) { 558 len = sizeof(frominet); 559 l = recvfrom(finet[i+1], line, MAXLINE, 560 0, (struct sockaddr *)&frominet, 561 &len); 562 if (l > 0) { 563 line[l] = '\0'; 564 hname = cvthname((struct sockaddr *)&frominet); 565 unmapped((struct sockaddr *)&frominet); 566 if (validate((struct sockaddr *)&frominet, hname)) 567 printline(hname, line); 568 } else if (l < 0 && errno != EINTR) 569 logerror("recvfrom inet"); 570 } 571 } 572 } 573 for (i = 0; i < nfunix; i++) { 574 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 575 len = sizeof(fromunix); 576 l = recvfrom(funix[i], line, MAXLINE, 0, 577 (struct sockaddr *)&fromunix, &len); 578 if (l > 0) { 579 line[l] = '\0'; 580 printline(LocalHostName, line); 581 } else if (l < 0 && errno != EINTR) 582 logerror("recvfrom unix"); 583 } 584 } 585 } 586 if (fdsr) 587 free(fdsr); 588 } 589 590 static void 591 unmapped(sa) 592 struct sockaddr *sa; 593 { 594 struct sockaddr_in6 *sin6; 595 struct sockaddr_in sin4; 596 597 if (sa->sa_family != AF_INET6) 598 return; 599 if (sa->sa_len != sizeof(struct sockaddr_in6) || 600 sizeof(sin4) > sa->sa_len) 601 return; 602 sin6 = (struct sockaddr_in6 *)sa; 603 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 604 return; 605 606 memset(&sin4, 0, sizeof(sin4)); 607 sin4.sin_family = AF_INET; 608 sin4.sin_len = sizeof(struct sockaddr_in); 609 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 610 sizeof(sin4.sin_addr)); 611 sin4.sin_port = sin6->sin6_port; 612 613 memcpy(sa, &sin4, sin4.sin_len); 614 } 615 616 static void 617 usage() 618 { 619 620 fprintf(stderr, "%s\n%s\n%s\n", 621 "usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]", 622 " [-m mark_interval] [-l log_socket]", 623 " [-p log_socket] [-P pid_file]"); 624 exit(1); 625 } 626 627 /* 628 * Take a raw input line, decode the message, and print the message 629 * on the appropriate log files. 630 */ 631 void 632 printline(hname, msg) 633 const char *hname; 634 char *msg; 635 { 636 int c, pri; 637 char *p, *q, line[MAXLINE + 1]; 638 639 /* test for special codes */ 640 pri = DEFUPRI; 641 p = msg; 642 if (*p == '<') { 643 pri = 0; 644 while (isdigit(*++p)) 645 pri = 10 * pri + (*p - '0'); 646 if (*p == '>') 647 ++p; 648 } 649 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 650 pri = DEFUPRI; 651 652 /* don't allow users to log kernel messages */ 653 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 654 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 655 656 q = line; 657 658 while ((c = (unsigned char)*p++) != '\0' && 659 q < &line[sizeof(line) - 4]) { 660 if ((c & 0x80) && c < 0xA0) { 661 c &= 0x7F; 662 *q++ = 'M'; 663 *q++ = '-'; 664 } 665 if (isascii(c) && iscntrl(c)) { 666 if (c == '\n') 667 *q++ = ' '; 668 else if (c == '\t') 669 *q++ = '\t'; 670 else { 671 *q++ = '^'; 672 *q++ = c ^ 0100; 673 } 674 } else 675 *q++ = c; 676 } 677 *q = '\0'; 678 679 logmsg(pri, line, hname, 0); 680 } 681 682 /* 683 * Read /dev/klog while data are available, split into lines. 684 */ 685 void 686 readklog() 687 { 688 char *p, *q, line[MAXLINE + 1]; 689 int len, i; 690 691 len = 0; 692 for (;;) { 693 i = read(fklog, line + len, MAXLINE - 1 - len); 694 if (i > 0) 695 line[i + len] = '\0'; 696 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 697 logerror("klog"); 698 fklog = -1; 699 break; 700 } else 701 break; 702 703 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 704 *q = '\0'; 705 printsys(p); 706 } 707 len = strlen(p); 708 if (len >= MAXLINE - 1) { 709 printsys(p); 710 len = 0; 711 } 712 if (len > 0) 713 memmove(line, p, len + 1); 714 } 715 if (len > 0) 716 printsys(line); 717 } 718 719 /* 720 * Take a raw input line from /dev/klog, format similar to syslog(). 721 */ 722 void 723 printsys(p) 724 char *p; 725 { 726 int pri, flags; 727 728 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 729 pri = DEFSPRI; 730 if (*p == '<') { 731 pri = 0; 732 while (isdigit(*++p)) 733 pri = 10 * pri + (*p - '0'); 734 if (*p == '>') 735 ++p; 736 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 737 flags |= IGN_CONS; 738 } else { 739 /* kernel printf's come out on console */ 740 flags |= IGN_CONS; 741 } 742 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 743 pri = DEFSPRI; 744 logmsg(pri, p, LocalHostName, flags); 745 } 746 747 time_t now; 748 749 /* 750 * Log a message to the appropriate log files, users, etc. based on 751 * the priority. 752 */ 753 void 754 logmsg(pri, msg, from, flags) 755 int pri; 756 const char *msg, *from; 757 int flags; 758 { 759 struct filed *f; 760 int i, fac, msglen, omask, prilev; 761 const char *timestamp; 762 char prog[NAME_MAX+1]; 763 char buf[MAXLINE+1]; 764 765 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 766 pri, flags, from, msg); 767 768 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 769 770 /* 771 * Check to see if msg looks non-standard. 772 */ 773 msglen = strlen(msg); 774 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 775 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 776 flags |= ADDDATE; 777 778 (void)time(&now); 779 if (flags & ADDDATE) 780 timestamp = ctime(&now) + 4; 781 else { 782 timestamp = msg; 783 msg += 16; 784 msglen -= 16; 785 } 786 787 /* skip leading blanks */ 788 while (isspace(*msg)) { 789 msg++; 790 msglen--; 791 } 792 793 /* extract facility and priority level */ 794 if (flags & MARK) 795 fac = LOG_NFACILITIES; 796 else 797 fac = LOG_FAC(pri); 798 prilev = LOG_PRI(pri); 799 800 /* extract program name */ 801 for (i = 0; i < NAME_MAX; i++) { 802 if (!isalnum(msg[i])) 803 break; 804 prog[i] = msg[i]; 805 } 806 prog[i] = 0; 807 808 /* add kernel prefix for kernel messages */ 809 if (flags & ISKERNEL) { 810 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 811 msg = buf; 812 msglen = strlen(buf); 813 } 814 815 /* log the message to the particular outputs */ 816 if (!Initialized) { 817 f = &consfile; 818 f->f_file = open(ctty, O_WRONLY, 0); 819 820 if (f->f_file >= 0) { 821 fprintlog(f, flags, msg); 822 (void)close(f->f_file); 823 } 824 (void)sigsetmask(omask); 825 return; 826 } 827 for (f = Files; f; f = f->f_next) { 828 /* skip messages that are incorrect priority */ 829 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 830 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 831 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 832 ) 833 || f->f_pmask[fac] == INTERNAL_NOPRI) 834 continue; 835 /* skip messages with the incorrect hostname */ 836 if (f->f_host) 837 switch (f->f_host[0]) { 838 case '+': 839 if (strcmp(from, f->f_host + 1) != 0) 840 continue; 841 break; 842 case '-': 843 if (strcmp(from, f->f_host + 1) == 0) 844 continue; 845 break; 846 } 847 848 /* skip messages with the incorrect program name */ 849 if (f->f_program) 850 if (strcmp(prog, f->f_program) != 0) 851 continue; 852 853 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 854 continue; 855 856 /* don't output marks to recently written files */ 857 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 858 continue; 859 860 /* 861 * suppress duplicate lines to this file 862 */ 863 if ((flags & MARK) == 0 && msglen == f->f_prevlen && 864 !strcmp(msg, f->f_prevline) && 865 !strcasecmp(from, f->f_prevhost)) { 866 (void)strlcpy(f->f_lasttime, timestamp, 16); 867 f->f_prevcount++; 868 dprintf("msg repeated %d times, %ld sec of %d\n", 869 f->f_prevcount, (long)(now - f->f_time), 870 repeatinterval[f->f_repeatcount]); 871 /* 872 * If domark would have logged this by now, 873 * flush it now (so we don't hold isolated messages), 874 * but back off so we'll flush less often 875 * in the future. 876 */ 877 if (now > REPEATTIME(f)) { 878 fprintlog(f, flags, (char *)NULL); 879 BACKOFF(f); 880 } 881 } else { 882 /* new line, save it */ 883 if (f->f_prevcount) 884 fprintlog(f, 0, (char *)NULL); 885 f->f_repeatcount = 0; 886 f->f_prevpri = pri; 887 (void)strlcpy(f->f_lasttime, timestamp, 16); 888 (void)strlcpy(f->f_prevhost, from, 889 sizeof(f->f_prevhost)); 890 if (msglen < MAXSVLINE) { 891 f->f_prevlen = msglen; 892 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 893 fprintlog(f, flags, (char *)NULL); 894 } else { 895 f->f_prevline[0] = 0; 896 f->f_prevlen = 0; 897 fprintlog(f, flags, msg); 898 } 899 } 900 } 901 (void)sigsetmask(omask); 902 } 903 904 void 905 fprintlog(f, flags, msg) 906 struct filed *f; 907 int flags; 908 const char *msg; 909 { 910 struct iovec iov[7]; 911 struct iovec *v; 912 struct addrinfo *r; 913 int i, l, lsent = 0; 914 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg; 915 const char *msgret; 916 917 v = iov; 918 if (f->f_type == F_WALL) { 919 v->iov_base = greetings; 920 v->iov_len = snprintf(greetings, sizeof greetings, 921 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 922 f->f_prevhost, ctime(&now)); 923 if (v->iov_len > 0) 924 v++; 925 v->iov_base = ""; 926 v->iov_len = 0; 927 v++; 928 } else { 929 v->iov_base = f->f_lasttime; 930 v->iov_len = 15; 931 v++; 932 v->iov_base = " "; 933 v->iov_len = 1; 934 v++; 935 } 936 937 if (LogFacPri) { 938 static char fp_buf[30]; /* Hollow laugh */ 939 int fac = f->f_prevpri & LOG_FACMASK; 940 int pri = LOG_PRI(f->f_prevpri); 941 const char *f_s = NULL; 942 char f_n[5]; /* Hollow laugh */ 943 const char *p_s = NULL; 944 char p_n[5]; /* Hollow laugh */ 945 946 if (LogFacPri > 1) { 947 CODE *c; 948 949 for (c = facilitynames; c->c_name; c++) { 950 if (c->c_val == fac) { 951 f_s = c->c_name; 952 break; 953 } 954 } 955 for (c = prioritynames; c->c_name; c++) { 956 if (c->c_val == pri) { 957 p_s = c->c_name; 958 break; 959 } 960 } 961 } 962 if (!f_s) { 963 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 964 f_s = f_n; 965 } 966 if (!p_s) { 967 snprintf(p_n, sizeof p_n, "%d", pri); 968 p_s = p_n; 969 } 970 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 971 v->iov_base = fp_buf; 972 v->iov_len = strlen(fp_buf); 973 } else { 974 v->iov_base=""; 975 v->iov_len = 0; 976 } 977 v++; 978 979 v->iov_base = f->f_prevhost; 980 v->iov_len = strlen(v->iov_base); 981 v++; 982 v->iov_base = " "; 983 v->iov_len = 1; 984 v++; 985 986 if (msg) { 987 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 988 if (wmsg == NULL) { 989 logerror("strdup"); 990 exit(1); 991 } 992 v->iov_base = wmsg; 993 v->iov_len = strlen(msg); 994 } else if (f->f_prevcount > 1) { 995 v->iov_base = repbuf; 996 v->iov_len = snprintf(repbuf, sizeof repbuf, 997 "last message repeated %d times", f->f_prevcount); 998 } else { 999 v->iov_base = f->f_prevline; 1000 v->iov_len = f->f_prevlen; 1001 } 1002 v++; 1003 1004 dprintf("Logging to %s", TypeNames[f->f_type]); 1005 f->f_time = now; 1006 1007 switch (f->f_type) { 1008 case F_UNUSED: 1009 dprintf("\n"); 1010 break; 1011 1012 case F_FORW: 1013 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1014 /* check for local vs remote messages */ 1015 if (strcasecmp(f->f_prevhost, LocalHostName)) 1016 l = snprintf(line, sizeof line - 1, 1017 "<%d>%.15s Forwarded from %s: %s", 1018 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1019 iov[5].iov_base); 1020 else 1021 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1022 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1023 if (l < 0) 1024 l = 0; 1025 else if (l > MAXLINE) 1026 l = MAXLINE; 1027 1028 if (finet) { 1029 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1030 for (i = 0; i < *finet; i++) { 1031 #if 0 1032 /* 1033 * should we check AF first, or just 1034 * trial and error? FWD 1035 */ 1036 if (r->ai_family == 1037 address_family_of(finet[i+1])) 1038 #endif 1039 lsent = sendto(finet[i+1], line, l, 0, 1040 r->ai_addr, r->ai_addrlen); 1041 if (lsent == l) 1042 break; 1043 } 1044 if (lsent == l && !send_to_all) 1045 break; 1046 } 1047 if (lsent != l) { 1048 int e = errno; 1049 (void)close(f->f_file); 1050 errno = e; 1051 f->f_type = F_UNUSED; 1052 logerror("sendto"); 1053 } 1054 } 1055 break; 1056 1057 case F_FILE: 1058 dprintf(" %s\n", f->f_un.f_fname); 1059 v->iov_base = "\n"; 1060 v->iov_len = 1; 1061 if (writev(f->f_file, iov, 7) < 0) { 1062 int e = errno; 1063 (void)close(f->f_file); 1064 f->f_type = F_UNUSED; 1065 errno = e; 1066 logerror(f->f_un.f_fname); 1067 } else if (flags & SYNC_FILE) 1068 (void)fsync(f->f_file); 1069 break; 1070 1071 case F_PIPE: 1072 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1073 v->iov_base = "\n"; 1074 v->iov_len = 1; 1075 if (f->f_un.f_pipe.f_pid == 0) { 1076 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1077 &f->f_un.f_pipe.f_pid)) < 0) { 1078 f->f_type = F_UNUSED; 1079 logerror(f->f_un.f_pipe.f_pname); 1080 break; 1081 } 1082 } 1083 if (writev(f->f_file, iov, 7) < 0) { 1084 int e = errno; 1085 (void)close(f->f_file); 1086 if (f->f_un.f_pipe.f_pid > 0) 1087 deadq_enter(f->f_un.f_pipe.f_pid, 1088 f->f_un.f_pipe.f_pname); 1089 f->f_un.f_pipe.f_pid = 0; 1090 errno = e; 1091 logerror(f->f_un.f_pipe.f_pname); 1092 } 1093 break; 1094 1095 case F_CONSOLE: 1096 if (flags & IGN_CONS) { 1097 dprintf(" (ignored)\n"); 1098 break; 1099 } 1100 /* FALLTHROUGH */ 1101 1102 case F_TTY: 1103 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1104 v->iov_base = "\r\n"; 1105 v->iov_len = 2; 1106 1107 errno = 0; /* ttymsg() only sometimes returns an errno */ 1108 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1109 f->f_type = F_UNUSED; 1110 logerror(msgret); 1111 } 1112 break; 1113 1114 case F_USERS: 1115 case F_WALL: 1116 dprintf("\n"); 1117 v->iov_base = "\r\n"; 1118 v->iov_len = 2; 1119 wallmsg(f, iov); 1120 break; 1121 } 1122 f->f_prevcount = 0; 1123 if (msg) 1124 free(wmsg); 1125 } 1126 1127 /* 1128 * WALLMSG -- Write a message to the world at large 1129 * 1130 * Write the specified message to either the entire 1131 * world, or a list of approved users. 1132 */ 1133 void 1134 wallmsg(f, iov) 1135 struct filed *f; 1136 struct iovec *iov; 1137 { 1138 static int reenter; /* avoid calling ourselves */ 1139 FILE *uf; 1140 struct utmp ut; 1141 int i; 1142 const char *p; 1143 char line[sizeof(ut.ut_line) + 1]; 1144 1145 if (reenter++) 1146 return; 1147 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1148 logerror(_PATH_UTMP); 1149 reenter = 0; 1150 return; 1151 } 1152 /* NOSTRICT */ 1153 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1154 if (ut.ut_name[0] == '\0') 1155 continue; 1156 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1157 if (f->f_type == F_WALL) { 1158 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1159 errno = 0; /* already in msg */ 1160 logerror(p); 1161 } 1162 continue; 1163 } 1164 /* should we send the message to this user? */ 1165 for (i = 0; i < MAXUNAMES; i++) { 1166 if (!f->f_un.f_uname[i][0]) 1167 break; 1168 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1169 UT_NAMESIZE)) { 1170 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1171 != NULL) { 1172 errno = 0; /* already in msg */ 1173 logerror(p); 1174 } 1175 break; 1176 } 1177 } 1178 } 1179 (void)fclose(uf); 1180 reenter = 0; 1181 } 1182 1183 void 1184 reapchild(signo) 1185 int signo __unused; 1186 { 1187 int status; 1188 pid_t pid; 1189 struct filed *f; 1190 1191 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1192 if (!Initialized) 1193 /* Don't tell while we are initting. */ 1194 continue; 1195 1196 /* First, look if it's a process from the dead queue. */ 1197 if (deadq_remove(pid)) 1198 goto oncemore; 1199 1200 /* Now, look in list of active processes. */ 1201 for (f = Files; f; f = f->f_next) 1202 if (f->f_type == F_PIPE && 1203 f->f_un.f_pipe.f_pid == pid) { 1204 (void)close(f->f_file); 1205 f->f_un.f_pipe.f_pid = 0; 1206 log_deadchild(pid, status, 1207 f->f_un.f_pipe.f_pname); 1208 break; 1209 } 1210 oncemore: 1211 continue; 1212 } 1213 } 1214 1215 /* 1216 * Return a printable representation of a host address. 1217 */ 1218 const char * 1219 cvthname(f) 1220 struct sockaddr *f; 1221 { 1222 int error; 1223 sigset_t omask, nmask; 1224 char *p; 1225 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1226 1227 error = getnameinfo((struct sockaddr *)f, 1228 ((struct sockaddr *)f)->sa_len, 1229 ip, sizeof ip, NULL, 0, 1230 NI_NUMERICHOST | withscopeid); 1231 dprintf("cvthname(%s)\n", ip); 1232 1233 if (error) { 1234 dprintf("Malformed from address %s\n", gai_strerror(error)); 1235 return ("???"); 1236 } 1237 if (!resolve) 1238 return (ip); 1239 1240 sigemptyset(&nmask); 1241 sigaddset(&nmask, SIGHUP); 1242 sigprocmask(SIG_BLOCK, &nmask, &omask); 1243 error = getnameinfo((struct sockaddr *)f, 1244 ((struct sockaddr *)f)->sa_len, 1245 hname, sizeof hname, NULL, 0, 1246 NI_NAMEREQD | withscopeid); 1247 sigprocmask(SIG_SETMASK, &omask, NULL); 1248 if (error) { 1249 dprintf("Host name for your address (%s) unknown\n", ip); 1250 return (ip); 1251 } 1252 /* XXX Not quite correct, but close enough for government work. */ 1253 if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0) 1254 *p = '\0'; 1255 return (hname); 1256 } 1257 1258 void 1259 dodie(signo) 1260 int signo; 1261 { 1262 1263 WantDie = signo; 1264 } 1265 1266 void 1267 domark(signo) 1268 int signo __unused; 1269 { 1270 1271 MarkSet = 1; 1272 } 1273 1274 /* 1275 * Print syslogd errors some place. 1276 */ 1277 void 1278 logerror(type) 1279 const char *type; 1280 { 1281 char buf[512]; 1282 1283 if (errno) 1284 (void)snprintf(buf, 1285 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1286 else 1287 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1288 errno = 0; 1289 dprintf("%s\n", buf); 1290 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1291 } 1292 1293 void 1294 die(signo) 1295 int signo; 1296 { 1297 struct filed *f; 1298 int was_initialized; 1299 char buf[100]; 1300 int i; 1301 1302 was_initialized = Initialized; 1303 Initialized = 0; /* Don't log SIGCHLDs. */ 1304 for (f = Files; f != NULL; f = f->f_next) { 1305 /* flush any pending output */ 1306 if (f->f_prevcount) 1307 fprintlog(f, 0, (char *)NULL); 1308 if (f->f_type == F_PIPE) 1309 (void)close(f->f_file); 1310 } 1311 Initialized = was_initialized; 1312 if (signo) { 1313 dprintf("syslogd: exiting on signal %d\n", signo); 1314 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1315 errno = 0; 1316 logerror(buf); 1317 } 1318 for (i = 0; i < nfunix; i++) 1319 if (funixn[i] && funix[i] != -1) 1320 (void)unlink(funixn[i]); 1321 exit(1); 1322 } 1323 1324 /* 1325 * INIT -- Initialize syslogd from configuration table 1326 */ 1327 void 1328 init(signo) 1329 int signo; 1330 { 1331 int i; 1332 FILE *cf; 1333 struct filed *f, *next, **nextp; 1334 char *p; 1335 char cline[LINE_MAX]; 1336 char prog[NAME_MAX+1]; 1337 char host[MAXHOSTNAMELEN]; 1338 char oldLocalHostName[MAXHOSTNAMELEN]; 1339 char hostMsg[2*MAXHOSTNAMELEN+40]; 1340 1341 dprintf("init\n"); 1342 1343 /* 1344 * Load hostname (may have changed). 1345 */ 1346 if (signo != 0) 1347 (void)strlcpy(oldLocalHostName, LocalHostName, 1348 sizeof(oldLocalHostName)); 1349 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1350 err(EX_OSERR, "gethostname() failed"); 1351 if ((p = strchr(LocalHostName, '.')) != NULL) { 1352 *p++ = '\0'; 1353 LocalDomain = p; 1354 } else 1355 LocalDomain = ""; 1356 1357 /* 1358 * Close all open log files. 1359 */ 1360 Initialized = 0; 1361 for (f = Files; f != NULL; f = next) { 1362 /* flush any pending output */ 1363 if (f->f_prevcount) 1364 fprintlog(f, 0, (char *)NULL); 1365 1366 switch (f->f_type) { 1367 case F_FILE: 1368 case F_FORW: 1369 case F_CONSOLE: 1370 case F_TTY: 1371 (void)close(f->f_file); 1372 break; 1373 case F_PIPE: 1374 (void)close(f->f_file); 1375 if (f->f_un.f_pipe.f_pid > 0) 1376 deadq_enter(f->f_un.f_pipe.f_pid, 1377 f->f_un.f_pipe.f_pname); 1378 f->f_un.f_pipe.f_pid = 0; 1379 break; 1380 } 1381 next = f->f_next; 1382 if (f->f_program) free(f->f_program); 1383 if (f->f_host) free(f->f_host); 1384 free((char *)f); 1385 } 1386 Files = NULL; 1387 nextp = &Files; 1388 1389 /* open the configuration file */ 1390 if ((cf = fopen(ConfFile, "r")) == NULL) { 1391 dprintf("cannot open %s\n", ConfFile); 1392 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1393 if (*nextp == NULL) { 1394 logerror("calloc"); 1395 exit(1); 1396 } 1397 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1398 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1399 if ((*nextp)->f_next == NULL) { 1400 logerror("calloc"); 1401 exit(1); 1402 } 1403 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1404 Initialized = 1; 1405 return; 1406 } 1407 1408 /* 1409 * Foreach line in the conf table, open that file. 1410 */ 1411 f = NULL; 1412 (void)strlcpy(host, "*", sizeof(host)); 1413 (void)strlcpy(prog, "*", sizeof(prog)); 1414 while (fgets(cline, sizeof(cline), cf) != NULL) { 1415 /* 1416 * check for end-of-section, comments, strip off trailing 1417 * spaces and newline character. #!prog is treated specially: 1418 * following lines apply only to that program. 1419 */ 1420 for (p = cline; isspace(*p); ++p) 1421 continue; 1422 if (*p == 0) 1423 continue; 1424 if (*p == '#') { 1425 p++; 1426 if (*p != '!' && *p != '+' && *p != '-') 1427 continue; 1428 } 1429 if (*p == '+' || *p == '-') { 1430 host[0] = *p++; 1431 while (isspace(*p)) 1432 p++; 1433 if ((!*p) || (*p == '*')) { 1434 (void)strlcpy(host, "*", sizeof(host)); 1435 continue; 1436 } 1437 if (*p == '@') 1438 p = LocalHostName; 1439 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1440 if (!isalnum(*p) && *p != '.' && *p != '-') 1441 break; 1442 host[i] = *p++; 1443 } 1444 host[i] = '\0'; 1445 continue; 1446 } 1447 if (*p == '!') { 1448 p++; 1449 while (isspace(*p)) p++; 1450 if ((!*p) || (*p == '*')) { 1451 (void)strlcpy(prog, "*", sizeof(prog)); 1452 continue; 1453 } 1454 for (i = 0; i < NAME_MAX; i++) { 1455 if (!isalnum(p[i])) 1456 break; 1457 prog[i] = p[i]; 1458 } 1459 prog[i] = 0; 1460 continue; 1461 } 1462 for (p = strchr(cline, '\0'); isspace(*--p);) 1463 continue; 1464 *++p = '\0'; 1465 f = (struct filed *)calloc(1, sizeof(*f)); 1466 if (f == NULL) { 1467 logerror("calloc"); 1468 exit(1); 1469 } 1470 *nextp = f; 1471 nextp = &f->f_next; 1472 cfline(cline, f, prog, host); 1473 } 1474 1475 /* close the configuration file */ 1476 (void)fclose(cf); 1477 1478 Initialized = 1; 1479 1480 if (Debug) { 1481 for (f = Files; f; f = f->f_next) { 1482 for (i = 0; i <= LOG_NFACILITIES; i++) 1483 if (f->f_pmask[i] == INTERNAL_NOPRI) 1484 printf("X "); 1485 else 1486 printf("%d ", f->f_pmask[i]); 1487 printf("%s: ", TypeNames[f->f_type]); 1488 switch (f->f_type) { 1489 case F_FILE: 1490 printf("%s", f->f_un.f_fname); 1491 break; 1492 1493 case F_CONSOLE: 1494 case F_TTY: 1495 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1496 break; 1497 1498 case F_FORW: 1499 printf("%s", f->f_un.f_forw.f_hname); 1500 break; 1501 1502 case F_PIPE: 1503 printf("%s", f->f_un.f_pipe.f_pname); 1504 break; 1505 1506 case F_USERS: 1507 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1508 printf("%s, ", f->f_un.f_uname[i]); 1509 break; 1510 } 1511 if (f->f_program) 1512 printf(" (%s)", f->f_program); 1513 printf("\n"); 1514 } 1515 } 1516 1517 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1518 dprintf("syslogd: restarted\n"); 1519 /* 1520 * Log a change in hostname, but only on a restart. 1521 */ 1522 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1523 (void)snprintf(hostMsg, sizeof(hostMsg), 1524 "syslogd: hostname changed, \"%s\" to \"%s\"", 1525 oldLocalHostName, LocalHostName); 1526 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1527 dprintf("%s\n", hostMsg); 1528 } 1529 } 1530 1531 /* 1532 * Crack a configuration file line 1533 */ 1534 void 1535 cfline(line, f, prog, host) 1536 const char *line; 1537 struct filed *f; 1538 const char *prog; 1539 const char *host; 1540 { 1541 struct addrinfo hints, *res; 1542 int error, i, pri; 1543 const char *p, *q; 1544 char *bp; 1545 char buf[MAXLINE], ebuf[100]; 1546 1547 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1548 1549 errno = 0; /* keep strerror() stuff out of logerror messages */ 1550 1551 /* clear out file entry */ 1552 memset(f, 0, sizeof(*f)); 1553 for (i = 0; i <= LOG_NFACILITIES; i++) 1554 f->f_pmask[i] = INTERNAL_NOPRI; 1555 1556 /* save hostname if any */ 1557 if (host && *host == '*') 1558 host = NULL; 1559 if (host) { 1560 int hl, dl; 1561 1562 f->f_host = strdup(host); 1563 if (f->f_host == NULL) { 1564 logerror("strdup"); 1565 exit(1); 1566 } 1567 hl = strlen(f->f_host); 1568 if (f->f_host[hl-1] == '.') 1569 f->f_host[--hl] = '\0'; 1570 dl = strlen(LocalDomain) + 1; 1571 if (hl > dl && f->f_host[hl-dl] == '.' && 1572 strcasecmp(f->f_host + hl - dl + 1, LocalDomain) == 0) 1573 f->f_host[hl-dl] = '\0'; 1574 } 1575 1576 /* save program name if any */ 1577 if (prog && *prog == '*') 1578 prog = NULL; 1579 if (prog) { 1580 f->f_program = strdup(prog); 1581 if (f->f_program == NULL) { 1582 logerror("strdup"); 1583 exit(1); 1584 } 1585 } 1586 1587 /* scan through the list of selectors */ 1588 for (p = line; *p && *p != '\t' && *p != ' ';) { 1589 int pri_done; 1590 int pri_cmp; 1591 1592 /* find the end of this facility name list */ 1593 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1594 continue; 1595 1596 /* get the priority comparison */ 1597 pri_cmp = 0; 1598 pri_done = 0; 1599 while (!pri_done) { 1600 switch (*q) { 1601 case '<': 1602 pri_cmp |= PRI_LT; 1603 q++; 1604 break; 1605 case '=': 1606 pri_cmp |= PRI_EQ; 1607 q++; 1608 break; 1609 case '>': 1610 pri_cmp |= PRI_GT; 1611 q++; 1612 break; 1613 default: 1614 pri_done++; 1615 break; 1616 } 1617 } 1618 if (!pri_cmp) 1619 pri_cmp = (UniquePriority) 1620 ? (PRI_EQ) 1621 : (PRI_EQ | PRI_GT) 1622 ; 1623 1624 /* collect priority name */ 1625 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1626 *bp++ = *q++; 1627 *bp = '\0'; 1628 1629 /* skip cruft */ 1630 while (strchr(",;", *q)) 1631 q++; 1632 1633 /* decode priority name */ 1634 if (*buf == '*') 1635 pri = LOG_PRIMASK + 1; 1636 else { 1637 pri = decode(buf, prioritynames); 1638 if (pri < 0) { 1639 (void)snprintf(ebuf, sizeof ebuf, 1640 "unknown priority name \"%s\"", buf); 1641 logerror(ebuf); 1642 return; 1643 } 1644 } 1645 1646 /* scan facilities */ 1647 while (*p && !strchr("\t.; ", *p)) { 1648 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1649 *bp++ = *p++; 1650 *bp = '\0'; 1651 1652 if (*buf == '*') 1653 for (i = 0; i < LOG_NFACILITIES; i++) { 1654 f->f_pmask[i] = pri; 1655 f->f_pcmp[i] = pri_cmp; 1656 } 1657 else { 1658 i = decode(buf, facilitynames); 1659 if (i < 0) { 1660 (void)snprintf(ebuf, sizeof ebuf, 1661 "unknown facility name \"%s\"", 1662 buf); 1663 logerror(ebuf); 1664 return; 1665 } 1666 f->f_pmask[i >> 3] = pri; 1667 f->f_pcmp[i >> 3] = pri_cmp; 1668 } 1669 while (*p == ',' || *p == ' ') 1670 p++; 1671 } 1672 1673 p = q; 1674 } 1675 1676 /* skip to action part */ 1677 while (*p == '\t' || *p == ' ') 1678 p++; 1679 1680 switch (*p) 1681 { 1682 case '@': 1683 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1684 sizeof(f->f_un.f_forw.f_hname)); 1685 memset(&hints, 0, sizeof(hints)); 1686 hints.ai_family = family; 1687 hints.ai_socktype = SOCK_DGRAM; 1688 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1689 &res); 1690 if (error) { 1691 logerror(gai_strerror(error)); 1692 break; 1693 } 1694 f->f_un.f_forw.f_addr = res; 1695 f->f_type = F_FORW; 1696 break; 1697 1698 case '/': 1699 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1700 f->f_type = F_UNUSED; 1701 logerror(p); 1702 break; 1703 } 1704 if (isatty(f->f_file)) { 1705 if (strcmp(p, ctty) == 0) 1706 f->f_type = F_CONSOLE; 1707 else 1708 f->f_type = F_TTY; 1709 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1710 sizeof(f->f_un.f_fname)); 1711 } else { 1712 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1713 f->f_type = F_FILE; 1714 } 1715 break; 1716 1717 case '|': 1718 f->f_un.f_pipe.f_pid = 0; 1719 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1720 f->f_type = F_PIPE; 1721 break; 1722 1723 case '*': 1724 f->f_type = F_WALL; 1725 break; 1726 1727 default: 1728 for (i = 0; i < MAXUNAMES && *p; i++) { 1729 for (q = p; *q && *q != ','; ) 1730 q++; 1731 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1732 if ((q - p) > UT_NAMESIZE) 1733 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1734 else 1735 f->f_un.f_uname[i][q - p] = '\0'; 1736 while (*q == ',' || *q == ' ') 1737 q++; 1738 p = q; 1739 } 1740 f->f_type = F_USERS; 1741 break; 1742 } 1743 } 1744 1745 1746 /* 1747 * Decode a symbolic name to a numeric value 1748 */ 1749 int 1750 decode(name, codetab) 1751 const char *name; 1752 CODE *codetab; 1753 { 1754 CODE *c; 1755 char *p, buf[40]; 1756 1757 if (isdigit(*name)) 1758 return (atoi(name)); 1759 1760 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1761 if (isupper(*name)) 1762 *p = tolower(*name); 1763 else 1764 *p = *name; 1765 } 1766 *p = '\0'; 1767 for (c = codetab; c->c_name; c++) 1768 if (!strcmp(buf, c->c_name)) 1769 return (c->c_val); 1770 1771 return (-1); 1772 } 1773 1774 void 1775 markit(void) 1776 { 1777 struct filed *f; 1778 dq_t q; 1779 1780 now = time((time_t *)NULL); 1781 MarkSeq += TIMERINTVL; 1782 if (MarkSeq >= MarkInterval) { 1783 logmsg(LOG_INFO, "-- MARK --", 1784 LocalHostName, ADDDATE|MARK); 1785 MarkSeq = 0; 1786 } 1787 1788 for (f = Files; f; f = f->f_next) { 1789 if (f->f_prevcount && now >= REPEATTIME(f)) { 1790 dprintf("flush %s: repeated %d times, %d sec.\n", 1791 TypeNames[f->f_type], f->f_prevcount, 1792 repeatinterval[f->f_repeatcount]); 1793 fprintlog(f, 0, (char *)NULL); 1794 BACKOFF(f); 1795 } 1796 } 1797 1798 /* Walk the dead queue, and see if we should signal somebody. */ 1799 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 1800 switch (q->dq_timeout) { 1801 case 0: 1802 /* Already signalled once, try harder now. */ 1803 if (kill(q->dq_pid, SIGKILL) != 0) 1804 (void)deadq_remove(q->dq_pid); 1805 break; 1806 1807 case 1: 1808 /* 1809 * Timed out on dead queue, send terminate 1810 * signal. Note that we leave the removal 1811 * from the dead queue to reapchild(), which 1812 * will also log the event (unless the process 1813 * didn't even really exist, in case we simply 1814 * drop it from the dead queue). 1815 */ 1816 if (kill(q->dq_pid, SIGTERM) != 0) 1817 (void)deadq_remove(q->dq_pid); 1818 /* FALLTHROUGH */ 1819 1820 default: 1821 q->dq_timeout--; 1822 } 1823 MarkSet = 0; 1824 (void)alarm(TIMERINTVL); 1825 } 1826 1827 /* 1828 * fork off and become a daemon, but wait for the child to come online 1829 * before returing to the parent, or we get disk thrashing at boot etc. 1830 * Set a timer so we don't hang forever if it wedges. 1831 */ 1832 int 1833 waitdaemon(nochdir, noclose, maxwait) 1834 int nochdir, noclose, maxwait; 1835 { 1836 int fd; 1837 int status; 1838 pid_t pid, childpid; 1839 1840 switch (childpid = fork()) { 1841 case -1: 1842 return (-1); 1843 case 0: 1844 break; 1845 default: 1846 signal(SIGALRM, timedout); 1847 alarm(maxwait); 1848 while ((pid = wait3(&status, 0, NULL)) != -1) { 1849 if (WIFEXITED(status)) 1850 errx(1, "child pid %d exited with return code %d", 1851 pid, WEXITSTATUS(status)); 1852 if (WIFSIGNALED(status)) 1853 errx(1, "child pid %d exited on signal %d%s", 1854 pid, WTERMSIG(status), 1855 WCOREDUMP(status) ? " (core dumped)" : 1856 ""); 1857 if (pid == childpid) /* it's gone... */ 1858 break; 1859 } 1860 exit(0); 1861 } 1862 1863 if (setsid() == -1) 1864 return (-1); 1865 1866 if (!nochdir) 1867 (void)chdir("/"); 1868 1869 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1870 (void)dup2(fd, STDIN_FILENO); 1871 (void)dup2(fd, STDOUT_FILENO); 1872 (void)dup2(fd, STDERR_FILENO); 1873 if (fd > 2) 1874 (void)close (fd); 1875 } 1876 return (getppid()); 1877 } 1878 1879 /* 1880 * We get a SIGALRM from the child when it's running and finished doing it's 1881 * fsync()'s or O_SYNC writes for all the boot messages. 1882 * 1883 * We also get a signal from the kernel if the timer expires, so check to 1884 * see what happened. 1885 */ 1886 void 1887 timedout(sig) 1888 int sig __unused; 1889 { 1890 int left; 1891 left = alarm(0); 1892 signal(SIGALRM, SIG_DFL); 1893 if (left == 0) 1894 errx(1, "timed out waiting for child"); 1895 else 1896 _exit(0); 1897 } 1898 1899 /* 1900 * Add `s' to the list of allowable peer addresses to accept messages 1901 * from. 1902 * 1903 * `s' is a string in the form: 1904 * 1905 * [*]domainname[:{servicename|portnumber|*}] 1906 * 1907 * or 1908 * 1909 * netaddr/maskbits[:{servicename|portnumber|*}] 1910 * 1911 * Returns -1 on error, 0 if the argument was valid. 1912 */ 1913 int 1914 allowaddr(s) 1915 char *s; 1916 { 1917 char *cp1, *cp2; 1918 struct allowedpeer ap; 1919 struct servent *se; 1920 int masklen = -1, i; 1921 struct addrinfo hints, *res; 1922 struct in_addr *addrp, *maskp; 1923 u_int32_t *addr6p, *mask6p; 1924 char ip[NI_MAXHOST]; 1925 1926 #ifdef INET6 1927 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1928 #endif 1929 cp1 = s; 1930 if ((cp1 = strrchr(cp1, ':'))) { 1931 /* service/port provided */ 1932 *cp1++ = '\0'; 1933 if (strlen(cp1) == 1 && *cp1 == '*') 1934 /* any port allowed */ 1935 ap.port = 0; 1936 else if ((se = getservbyname(cp1, "udp"))) 1937 ap.port = ntohs(se->s_port); 1938 else { 1939 ap.port = strtol(cp1, &cp2, 0); 1940 if (*cp2 != '\0') 1941 return -1; /* port not numeric */ 1942 } 1943 } else { 1944 if ((se = getservbyname("syslog", "udp"))) 1945 ap.port = ntohs(se->s_port); 1946 else 1947 /* sanity, should not happen */ 1948 ap.port = 514; 1949 } 1950 1951 if ((cp1 = strchr(s, '/')) != NULL && 1952 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 1953 *cp1 = '\0'; 1954 if ((masklen = atoi(cp1 + 1)) < 0) 1955 return -1; 1956 } 1957 #ifdef INET6 1958 if (*s == '[') { 1959 cp2 = s + strlen(s) - 1; 1960 if (*cp2 == ']') { 1961 ++s; 1962 *cp2 = '\0'; 1963 } else 1964 cp2 = NULL; 1965 } else 1966 cp2 = NULL; 1967 #endif 1968 memset(&hints, 0, sizeof(hints)); 1969 hints.ai_family = PF_UNSPEC; 1970 hints.ai_socktype = SOCK_DGRAM; 1971 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 1972 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 1973 ap.isnumeric = 1; 1974 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 1975 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 1976 ap.a_mask.ss_family = res->ai_family; 1977 if (res->ai_family == AF_INET) { 1978 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 1979 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 1980 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 1981 if (masklen < 0) { 1982 /* use default netmask */ 1983 if (IN_CLASSA(ntohl(addrp->s_addr))) 1984 maskp->s_addr = htonl(IN_CLASSA_NET); 1985 else if (IN_CLASSB(ntohl(addrp->s_addr))) 1986 maskp->s_addr = htonl(IN_CLASSB_NET); 1987 else 1988 maskp->s_addr = htonl(IN_CLASSC_NET); 1989 } else if (masklen <= 32) { 1990 /* convert masklen to netmask */ 1991 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 1992 } else { 1993 freeaddrinfo(res); 1994 return -1; 1995 } 1996 /* Lose any host bits in the network number. */ 1997 addrp->s_addr &= maskp->s_addr; 1998 } 1999 #ifdef INET6 2000 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2001 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2002 if (masklen < 0) 2003 masklen = 128; 2004 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2005 /* convert masklen to netmask */ 2006 while (masklen > 0) { 2007 if (masklen < 32) { 2008 *mask6p = htonl(~(0xffffffff >> masklen)); 2009 break; 2010 } 2011 *mask6p++ = 0xffffffff; 2012 masklen -= 32; 2013 } 2014 /* Lose any host bits in the network number. */ 2015 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2016 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2017 for (i = 0; i < 4; i++) 2018 addr6p[i] &= mask6p[i]; 2019 } 2020 #endif 2021 else { 2022 freeaddrinfo(res); 2023 return -1; 2024 } 2025 freeaddrinfo(res); 2026 } else { 2027 /* arg `s' is domain name */ 2028 ap.isnumeric = 0; 2029 ap.a_name = s; 2030 if (cp1) 2031 *cp1 = '/'; 2032 #ifdef INET6 2033 if (cp2) { 2034 *cp2 = ']'; 2035 --s; 2036 } 2037 #endif 2038 } 2039 2040 if (Debug) { 2041 printf("allowaddr: rule %d: ", NumAllowed); 2042 if (ap.isnumeric) { 2043 printf("numeric, "); 2044 getnameinfo((struct sockaddr *)&ap.a_addr, 2045 ((struct sockaddr *)&ap.a_addr)->sa_len, 2046 ip, sizeof ip, NULL, 0, 2047 NI_NUMERICHOST | withscopeid); 2048 printf("addr = %s, ", ip); 2049 getnameinfo((struct sockaddr *)&ap.a_mask, 2050 ((struct sockaddr *)&ap.a_mask)->sa_len, 2051 ip, sizeof ip, NULL, 0, 2052 NI_NUMERICHOST | withscopeid); 2053 printf("mask = %s; ", ip); 2054 } else 2055 printf("domainname = %s; ", ap.a_name); 2056 printf("port = %d\n", ap.port); 2057 } 2058 2059 if ((AllowedPeers = realloc(AllowedPeers, 2060 ++NumAllowed * sizeof(struct allowedpeer))) 2061 == NULL) { 2062 logerror("realloc"); 2063 exit(1); 2064 } 2065 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2066 return 0; 2067 } 2068 2069 /* 2070 * Validate that the remote peer has permission to log to us. 2071 */ 2072 int 2073 validate(sa, hname) 2074 struct sockaddr *sa; 2075 const char *hname; 2076 { 2077 int i, j, reject; 2078 size_t l1, l2; 2079 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2080 struct allowedpeer *ap; 2081 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2082 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2083 struct addrinfo hints, *res; 2084 u_short sport; 2085 2086 if (NumAllowed == 0) 2087 /* traditional behaviour, allow everything */ 2088 return 1; 2089 2090 (void)strlcpy(name, hname, sizeof(name)); 2091 memset(&hints, 0, sizeof(hints)); 2092 hints.ai_family = PF_UNSPEC; 2093 hints.ai_socktype = SOCK_DGRAM; 2094 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2095 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2096 freeaddrinfo(res); 2097 else if (strchr(name, '.') == NULL) { 2098 strlcat(name, ".", sizeof name); 2099 strlcat(name, LocalDomain, sizeof name); 2100 } 2101 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2102 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2103 return 0; /* for safety, should not occur */ 2104 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2105 ip, port, name); 2106 sport = atoi(port); 2107 2108 /* now, walk down the list */ 2109 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2110 if (ap->port != 0 && ap->port != sport) { 2111 dprintf("rejected in rule %d due to port mismatch.\n", i); 2112 continue; 2113 } 2114 2115 if (ap->isnumeric) { 2116 if (ap->a_addr.ss_family != sa->sa_family) { 2117 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2118 continue; 2119 } 2120 if (ap->a_addr.ss_family == AF_INET) { 2121 sin4 = (struct sockaddr_in *)sa; 2122 a4p = (struct sockaddr_in *)&ap->a_addr; 2123 m4p = (struct sockaddr_in *)&ap->a_mask; 2124 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2125 != a4p->sin_addr.s_addr) { 2126 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2127 continue; 2128 } 2129 } 2130 #ifdef INET6 2131 else if (ap->a_addr.ss_family == AF_INET6) { 2132 sin6 = (struct sockaddr_in6 *)sa; 2133 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2134 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2135 #ifdef NI_WITHSCOPEID 2136 if (a6p->sin6_scope_id != 0 && 2137 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2138 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2139 continue; 2140 } 2141 #endif 2142 reject = 0; 2143 for (j = 0; j < 16; j += 4) { 2144 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2145 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2146 ++reject; 2147 break; 2148 } 2149 } 2150 if (reject) { 2151 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2152 continue; 2153 } 2154 } 2155 #endif 2156 else 2157 continue; 2158 } else { 2159 cp = ap->a_name; 2160 l1 = strlen(name); 2161 if (*cp == '*') { 2162 /* allow wildmatch */ 2163 cp++; 2164 l2 = strlen(cp); 2165 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2166 dprintf("rejected in rule %d due to name mismatch.\n", i); 2167 continue; 2168 } 2169 } else { 2170 /* exact match */ 2171 l2 = strlen(cp); 2172 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2173 dprintf("rejected in rule %d due to name mismatch.\n", i); 2174 continue; 2175 } 2176 } 2177 } 2178 dprintf("accepted in rule %d.\n", i); 2179 return 1; /* hooray! */ 2180 } 2181 return 0; 2182 } 2183 2184 /* 2185 * Fairly similar to popen(3), but returns an open descriptor, as 2186 * opposed to a FILE *. 2187 */ 2188 int 2189 p_open(prog, pid) 2190 const char *prog; 2191 pid_t *pid; 2192 { 2193 int pfd[2], nulldesc, i; 2194 sigset_t omask, mask; 2195 char *argv[4]; /* sh -c cmd NULL */ 2196 char errmsg[200]; 2197 2198 if (pipe(pfd) == -1) 2199 return -1; 2200 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2201 /* we are royally screwed anyway */ 2202 return -1; 2203 2204 sigemptyset(&mask); 2205 sigaddset(&mask, SIGALRM); 2206 sigaddset(&mask, SIGHUP); 2207 sigprocmask(SIG_BLOCK, &mask, &omask); 2208 switch ((*pid = fork())) { 2209 case -1: 2210 sigprocmask(SIG_SETMASK, &omask, 0); 2211 close(nulldesc); 2212 return -1; 2213 2214 case 0: 2215 /* XXX should check for NULL return */ 2216 argv[0] = strdup("sh"); 2217 argv[1] = strdup("-c"); 2218 argv[2] = strdup(prog); 2219 argv[3] = NULL; 2220 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2221 logerror("strdup"); 2222 exit(1); 2223 } 2224 2225 alarm(0); 2226 (void)setsid(); /* Avoid catching SIGHUPs. */ 2227 2228 /* 2229 * Throw away pending signals, and reset signal 2230 * behaviour to standard values. 2231 */ 2232 signal(SIGALRM, SIG_IGN); 2233 signal(SIGHUP, SIG_IGN); 2234 sigprocmask(SIG_SETMASK, &omask, 0); 2235 signal(SIGPIPE, SIG_DFL); 2236 signal(SIGQUIT, SIG_DFL); 2237 signal(SIGALRM, SIG_DFL); 2238 signal(SIGHUP, SIG_DFL); 2239 2240 dup2(pfd[0], STDIN_FILENO); 2241 dup2(nulldesc, STDOUT_FILENO); 2242 dup2(nulldesc, STDERR_FILENO); 2243 for (i = getdtablesize(); i > 2; i--) 2244 (void) close(i); 2245 2246 (void) execvp(_PATH_BSHELL, argv); 2247 _exit(255); 2248 } 2249 2250 sigprocmask(SIG_SETMASK, &omask, 0); 2251 close(nulldesc); 2252 close(pfd[0]); 2253 /* 2254 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2255 * supposed to get an EWOULDBLOCK on writev(2), which is 2256 * caught by the logic above anyway, which will in turn close 2257 * the pipe, and fork a new logging subprocess if necessary. 2258 * The stale subprocess will be killed some time later unless 2259 * it terminated itself due to closing its input pipe (so we 2260 * get rid of really dead puppies). 2261 */ 2262 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2263 /* This is bad. */ 2264 (void)snprintf(errmsg, sizeof errmsg, 2265 "Warning: cannot change pipe to PID %d to " 2266 "non-blocking behaviour.", 2267 (int)*pid); 2268 logerror(errmsg); 2269 } 2270 return pfd[1]; 2271 } 2272 2273 void 2274 deadq_enter(pid, name) 2275 pid_t pid; 2276 const char *name; 2277 { 2278 dq_t p; 2279 int status; 2280 2281 /* 2282 * Be paranoid, if we can't signal the process, don't enter it 2283 * into the dead queue (perhaps it's already dead). If possible, 2284 * we try to fetch and log the child's status. 2285 */ 2286 if (kill(pid, 0) != 0) { 2287 if (waitpid(pid, &status, WNOHANG) > 0) 2288 log_deadchild(pid, status, name); 2289 return; 2290 } 2291 2292 p = malloc(sizeof(struct deadq_entry)); 2293 if (p == NULL) { 2294 logerror("malloc"); 2295 exit(1); 2296 } 2297 2298 p->dq_pid = pid; 2299 p->dq_timeout = DQ_TIMO_INIT; 2300 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2301 } 2302 2303 int 2304 deadq_remove(pid) 2305 pid_t pid; 2306 { 2307 dq_t q; 2308 2309 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 2310 if (q->dq_pid == pid) { 2311 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2312 free(q); 2313 return 1; 2314 } 2315 2316 return 0; 2317 } 2318 2319 void 2320 log_deadchild(pid, status, name) 2321 pid_t pid; 2322 int status; 2323 const char *name; 2324 { 2325 int code; 2326 char buf[256]; 2327 const char *reason; 2328 2329 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2330 if (WIFSIGNALED(status)) { 2331 reason = "due to signal"; 2332 code = WTERMSIG(status); 2333 } else { 2334 reason = "with status"; 2335 code = WEXITSTATUS(status); 2336 if (code == 0) 2337 return; 2338 } 2339 (void)snprintf(buf, sizeof buf, 2340 "Logging subprocess %d (%s) exited %s %d.", 2341 pid, name, reason, code); 2342 logerror(buf); 2343 } 2344 2345 int * 2346 socksetup(af, bindhostname) 2347 int af; 2348 const char *bindhostname; 2349 { 2350 struct addrinfo hints, *res, *r; 2351 int error, maxs, *s, *socks; 2352 2353 memset(&hints, 0, sizeof(hints)); 2354 hints.ai_flags = AI_PASSIVE; 2355 hints.ai_family = af; 2356 hints.ai_socktype = SOCK_DGRAM; 2357 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2358 if (error) { 2359 logerror(gai_strerror(error)); 2360 errno = 0; 2361 die(0); 2362 } 2363 2364 /* Count max number of sockets we may open */ 2365 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2366 socks = malloc((maxs+1) * sizeof(int)); 2367 if (socks == NULL) { 2368 logerror("couldn't allocate memory for sockets"); 2369 die(0); 2370 } 2371 2372 *socks = 0; /* num of sockets counter at start of array */ 2373 s = socks + 1; 2374 for (r = res; r; r = r->ai_next) { 2375 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2376 if (*s < 0) { 2377 logerror("socket"); 2378 continue; 2379 } 2380 #ifdef IPV6_BINDV6ONLY 2381 if (r->ai_family == AF_INET6) { 2382 int on = 1; 2383 if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY, 2384 (char *)&on, sizeof (on)) < 0) { 2385 logerror("setsockopt"); 2386 close(*s); 2387 continue; 2388 } 2389 } 2390 #endif 2391 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2392 close(*s); 2393 logerror("bind"); 2394 continue; 2395 } 2396 2397 (*socks)++; 2398 s++; 2399 } 2400 2401 if (*socks == 0) { 2402 free(socks); 2403 if (Debug) 2404 return(NULL); 2405 else 2406 die(0); 2407 } 2408 if (res) 2409 freeaddrinfo(res); 2410 2411 return(socks); 2412 } 2413