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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE 120 /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 78 #include <sys/param.h> 79 #include <sys/ioctl.h> 80 #include <sys/mman.h> 81 #include <sys/stat.h> 82 #include <sys/wait.h> 83 #include <sys/socket.h> 84 #include <sys/queue.h> 85 #include <sys/uio.h> 86 #include <sys/un.h> 87 #include <sys/time.h> 88 #include <sys/resource.h> 89 #include <sys/syslimits.h> 90 #include <sys/types.h> 91 92 #include <netinet/in.h> 93 #include <netdb.h> 94 #include <arpa/inet.h> 95 96 #include <ctype.h> 97 #include <err.h> 98 #include <errno.h> 99 #include <fcntl.h> 100 #include <libutil.h> 101 #include <limits.h> 102 #include <paths.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 <utmpx.h> 110 111 #include "pathnames.h" 112 #include "ttymsg.h" 113 114 #define SYSLOG_NAMES 115 #include <sys/syslog.h> 116 117 const char *ConfFile = _PATH_LOGCONF; 118 const char *PidFile = _PATH_LOGPID; 119 const char ctty[] = _PATH_CONSOLE; 120 121 #define dprintf if (Debug) printf 122 123 #define MAXUNAMES 20 /* maximum number of user names */ 124 125 /* 126 * Unix sockets. 127 * We have two default sockets, one with 666 permissions, 128 * and one for privileged programs. 129 */ 130 struct funix { 131 int s; 132 const char *name; 133 mode_t mode; 134 STAILQ_ENTRY(funix) next; 135 }; 136 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 137 { NULL } }; 138 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 139 { &funix_secure } }; 140 141 STAILQ_HEAD(, funix) funixes = { &funix_default, 142 &(funix_secure.next.stqe_next) }; 143 144 /* 145 * Flags to logmsg(). 146 */ 147 148 #define IGN_CONS 0x001 /* don't print on console */ 149 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 150 #define ADDDATE 0x004 /* add a date to the message */ 151 #define MARK 0x008 /* this message is a mark */ 152 #define ISKERNEL 0x010 /* kernel generated message */ 153 154 /* 155 * This structure represents the files that will have log 156 * copies printed. 157 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 158 * or if f_type if F_PIPE and f_pid > 0. 159 */ 160 161 struct filed { 162 struct filed *f_next; /* next in linked list */ 163 short f_type; /* entry type, see below */ 164 short f_file; /* file descriptor */ 165 time_t f_time; /* time this was last written */ 166 char *f_host; /* host from which to recd. */ 167 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 168 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 169 #define PRI_LT 0x1 170 #define PRI_EQ 0x2 171 #define PRI_GT 0x4 172 char *f_program; /* program this applies to */ 173 union { 174 char f_uname[MAXUNAMES][MAXLOGNAME]; 175 struct { 176 char f_hname[MAXHOSTNAMELEN]; 177 struct addrinfo *f_addr; 178 179 } f_forw; /* forwarding address */ 180 char f_fname[MAXPATHLEN]; 181 struct { 182 char f_pname[MAXPATHLEN]; 183 pid_t f_pid; 184 } f_pipe; 185 } f_un; 186 char f_prevline[MAXSVLINE]; /* last message logged */ 187 char f_lasttime[16]; /* time of last occurrence */ 188 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 189 int f_prevpri; /* pri of f_prevline */ 190 int f_prevlen; /* length of f_prevline */ 191 int f_prevcount; /* repetition cnt of prevline */ 192 u_int f_repeatcount; /* number of "repeated" msgs */ 193 int f_flags; /* file-specific flags */ 194 #define FFLAG_SYNC 0x01 195 #define FFLAG_NEEDSYNC 0x02 196 }; 197 198 /* 199 * Queue of about-to-be dead processes we should watch out for. 200 */ 201 202 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 203 struct stailhead *deadq_headp; 204 205 struct deadq_entry { 206 pid_t dq_pid; 207 int dq_timeout; 208 TAILQ_ENTRY(deadq_entry) dq_entries; 209 }; 210 211 /* 212 * The timeout to apply to processes waiting on the dead queue. Unit 213 * of measure is `mark intervals', i.e. 20 minutes by default. 214 * Processes on the dead queue will be terminated after that time. 215 */ 216 217 #define DQ_TIMO_INIT 2 218 219 typedef struct deadq_entry *dq_t; 220 221 222 /* 223 * Struct to hold records of network addresses that are allowed to log 224 * to us. 225 */ 226 struct allowedpeer { 227 int isnumeric; 228 u_short port; 229 union { 230 struct { 231 struct sockaddr_storage addr; 232 struct sockaddr_storage mask; 233 } numeric; 234 char *name; 235 } u; 236 #define a_addr u.numeric.addr 237 #define a_mask u.numeric.mask 238 #define a_name u.name 239 }; 240 241 242 /* 243 * Intervals at which we flush out "message repeated" messages, 244 * in seconds after previous message is logged. After each flush, 245 * we move to the next interval until we reach the largest. 246 */ 247 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 248 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 249 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 250 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 251 (f)->f_repeatcount = MAXREPEAT; \ 252 } 253 254 /* values for f_type */ 255 #define F_UNUSED 0 /* unused entry */ 256 #define F_FILE 1 /* regular file */ 257 #define F_TTY 2 /* terminal */ 258 #define F_CONSOLE 3 /* console terminal */ 259 #define F_FORW 4 /* remote machine */ 260 #define F_USERS 5 /* list of users */ 261 #define F_WALL 6 /* everyone logged on */ 262 #define F_PIPE 7 /* pipe to program */ 263 264 const char *TypeNames[8] = { 265 "UNUSED", "FILE", "TTY", "CONSOLE", 266 "FORW", "USERS", "WALL", "PIPE" 267 }; 268 269 static struct filed *Files; /* Log files that we write to */ 270 static struct filed consfile; /* Console */ 271 272 static int Debug; /* debug flag */ 273 static int resolve = 1; /* resolve hostname */ 274 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 275 static const char *LocalDomain; /* our local domain name */ 276 static int *finet; /* Internet datagram socket */ 277 static int fklog = -1; /* /dev/klog */ 278 static int Initialized; /* set when we have initialized ourselves */ 279 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 280 static int MarkSeq; /* mark sequence number */ 281 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 282 static int SecureMode; /* when true, receive only unix domain socks */ 283 #ifdef INET6 284 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 285 #else 286 static int family = PF_INET; /* protocol family (IPv4 only) */ 287 #endif 288 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 289 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 290 static int use_bootfile; /* log entire bootfile for every kern msg */ 291 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 292 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 293 294 static char bootfile[MAXLINE+1]; /* booted kernel file */ 295 296 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 297 static int NumAllowed; /* Number of entries in AllowedPeers */ 298 static int RemoteAddDate; /* Always set the date on remote messages */ 299 300 static int UniquePriority; /* Only log specified priority? */ 301 static int LogFacPri; /* Put facility and priority in log message: */ 302 /* 0=no, 1=numeric, 2=names */ 303 static int KeepKernFac; /* Keep remotely logged kernel facility */ 304 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 305 static struct pidfh *pfh; 306 307 volatile sig_atomic_t MarkSet, WantDie; 308 309 static int allowaddr(char *); 310 static void cfline(const char *, struct filed *, 311 const char *, const char *); 312 static const char *cvthname(struct sockaddr *); 313 static void deadq_enter(pid_t, const char *); 314 static int deadq_remove(pid_t); 315 static int decode(const char *, const CODE *); 316 static void die(int); 317 static void dodie(int); 318 static void dofsync(void); 319 static void domark(int); 320 static void fprintlog(struct filed *, int, const char *); 321 static int *socksetup(int, char *); 322 static void init(int); 323 static void logerror(const char *); 324 static void logmsg(int, const char *, const char *, int); 325 static void log_deadchild(pid_t, int, const char *); 326 static void markit(void); 327 static int skip_message(const char *, const char *, int); 328 static void printline(const char *, char *, int); 329 static void printsys(char *); 330 static int p_open(const char *, pid_t *); 331 static void readklog(void); 332 static void reapchild(int); 333 static void usage(void); 334 static int validate(struct sockaddr *, const char *); 335 static void unmapped(struct sockaddr *); 336 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 337 static int waitdaemon(int, int, int); 338 static void timedout(int); 339 static void double_rbuf(int); 340 341 int 342 main(int argc, char *argv[]) 343 { 344 int ch, i, fdsrmax = 0, l; 345 struct sockaddr_un sunx, fromunix; 346 struct sockaddr_storage frominet; 347 fd_set *fdsr = NULL; 348 char line[MAXLINE + 1]; 349 char *bindhostname; 350 const char *hname; 351 struct timeval tv, *tvp; 352 struct sigaction sact; 353 struct funix *fx, *fx1; 354 sigset_t mask; 355 pid_t ppid = 1, spid; 356 socklen_t len; 357 358 if (madvise(NULL, 0, MADV_PROTECT) != 0) 359 dprintf("madvise() failed: %s\n", strerror(errno)); 360 361 bindhostname = NULL; 362 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 363 != -1) 364 switch (ch) { 365 case '4': 366 family = PF_INET; 367 break; 368 #ifdef INET6 369 case '6': 370 family = PF_INET6; 371 break; 372 #endif 373 case '8': 374 mask_C1 = 0; 375 break; 376 case 'A': 377 send_to_all++; 378 break; 379 case 'a': /* allow specific network addresses only */ 380 if (allowaddr(optarg) == -1) 381 usage(); 382 break; 383 case 'b': 384 bindhostname = optarg; 385 break; 386 case 'c': 387 no_compress++; 388 break; 389 case 'C': 390 logflags |= O_CREAT; 391 break; 392 case 'd': /* debug */ 393 Debug++; 394 break; 395 case 'f': /* configuration file */ 396 ConfFile = optarg; 397 break; 398 case 'k': /* keep remote kern fac */ 399 KeepKernFac = 1; 400 break; 401 case 'l': 402 { 403 long perml; 404 mode_t mode; 405 char *name, *ep; 406 407 if (optarg[0] == '/') { 408 mode = DEFFILEMODE; 409 name = optarg; 410 } else if ((name = strchr(optarg, ':')) != NULL) { 411 *name++ = '\0'; 412 if (name[0] != '/') 413 errx(1, "socket name must be absolute " 414 "path"); 415 if (isdigit(*optarg)) { 416 perml = strtol(optarg, &ep, 8); 417 if (*ep || perml < 0 || 418 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 419 errx(1, "invalid mode %s, exiting", 420 optarg); 421 mode = (mode_t )perml; 422 } else 423 errx(1, "invalid mode %s, exiting", 424 optarg); 425 } else /* doesn't begin with '/', and no ':' */ 426 errx(1, "can't parse path %s", optarg); 427 428 if (strlen(name) >= sizeof(sunx.sun_path)) 429 errx(1, "%s path too long, exiting", name); 430 if ((fx = malloc(sizeof(struct funix))) == NULL) 431 errx(1, "malloc failed"); 432 fx->s = -1; 433 fx->name = name; 434 fx->mode = mode; 435 STAILQ_INSERT_TAIL(&funixes, fx, next); 436 break; 437 } 438 case 'm': /* mark interval */ 439 MarkInterval = atoi(optarg) * 60; 440 break; 441 case 'N': 442 NoBind = 1; 443 SecureMode = 1; 444 break; 445 case 'n': 446 resolve = 0; 447 break; 448 case 'o': 449 use_bootfile = 1; 450 break; 451 case 'p': /* path */ 452 if (strlen(optarg) >= sizeof(sunx.sun_path)) 453 errx(1, "%s path too long, exiting", optarg); 454 funix_default.name = optarg; 455 break; 456 case 'P': /* path for alt. PID */ 457 PidFile = optarg; 458 break; 459 case 's': /* no network mode */ 460 SecureMode++; 461 break; 462 case 'S': /* path for privileged originator */ 463 if (strlen(optarg) >= sizeof(sunx.sun_path)) 464 errx(1, "%s path too long, exiting", optarg); 465 funix_secure.name = optarg; 466 break; 467 case 'T': 468 RemoteAddDate = 1; 469 break; 470 case 'u': /* only log specified priority */ 471 UniquePriority++; 472 break; 473 case 'v': /* log facility and priority */ 474 LogFacPri++; 475 break; 476 default: 477 usage(); 478 } 479 if ((argc -= optind) != 0) 480 usage(); 481 482 pfh = pidfile_open(PidFile, 0600, &spid); 483 if (pfh == NULL) { 484 if (errno == EEXIST) 485 errx(1, "syslogd already running, pid: %d", spid); 486 warn("cannot open pid file"); 487 } 488 489 if (!Debug) { 490 ppid = waitdaemon(0, 0, 30); 491 if (ppid < 0) { 492 warn("could not become daemon"); 493 pidfile_remove(pfh); 494 exit(1); 495 } 496 } else { 497 setlinebuf(stdout); 498 } 499 500 if (NumAllowed) 501 endservent(); 502 503 consfile.f_type = F_CONSOLE; 504 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 505 sizeof(consfile.f_un.f_fname)); 506 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 507 (void)signal(SIGTERM, dodie); 508 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 509 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 510 /* 511 * We don't want the SIGCHLD and SIGHUP handlers to interfere 512 * with each other; they are likely candidates for being called 513 * simultaneously (SIGHUP closes pipe descriptor, process dies, 514 * SIGCHLD happens). 515 */ 516 sigemptyset(&mask); 517 sigaddset(&mask, SIGHUP); 518 sact.sa_handler = reapchild; 519 sact.sa_mask = mask; 520 sact.sa_flags = SA_RESTART; 521 (void)sigaction(SIGCHLD, &sact, NULL); 522 (void)signal(SIGALRM, domark); 523 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 524 (void)alarm(TIMERINTVL); 525 526 TAILQ_INIT(&deadq_head); 527 528 #ifndef SUN_LEN 529 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 530 #endif 531 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 532 (void)unlink(fx->name); 533 memset(&sunx, 0, sizeof(sunx)); 534 sunx.sun_family = AF_LOCAL; 535 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 536 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 537 if (fx->s < 0 || 538 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 539 chmod(fx->name, fx->mode) < 0) { 540 (void)snprintf(line, sizeof line, 541 "cannot create %s", fx->name); 542 logerror(line); 543 dprintf("cannot create %s (%d)\n", fx->name, errno); 544 if (fx == &funix_default || fx == &funix_secure) 545 die(0); 546 else { 547 STAILQ_REMOVE(&funixes, fx, funix, next); 548 continue; 549 } 550 double_rbuf(fx->s); 551 } 552 } 553 if (SecureMode <= 1) 554 finet = socksetup(family, bindhostname); 555 556 if (finet) { 557 if (SecureMode) { 558 for (i = 0; i < *finet; i++) { 559 if (shutdown(finet[i+1], SHUT_RD) < 0) { 560 logerror("shutdown"); 561 if (!Debug) 562 die(0); 563 } 564 } 565 } else { 566 dprintf("listening on inet and/or inet6 socket\n"); 567 } 568 dprintf("sending on inet and/or inet6 socket\n"); 569 } 570 571 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 572 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 573 fklog = -1; 574 if (fklog < 0) 575 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 576 577 /* tuck my process id away */ 578 pidfile_write(pfh); 579 580 dprintf("off & running....\n"); 581 582 init(0); 583 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 584 sigemptyset(&mask); 585 sigaddset(&mask, SIGCHLD); 586 sact.sa_handler = init; 587 sact.sa_mask = mask; 588 sact.sa_flags = SA_RESTART; 589 (void)sigaction(SIGHUP, &sact, NULL); 590 591 tvp = &tv; 592 tv.tv_sec = tv.tv_usec = 0; 593 594 if (fklog != -1 && fklog > fdsrmax) 595 fdsrmax = fklog; 596 if (finet && !SecureMode) { 597 for (i = 0; i < *finet; i++) { 598 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 599 fdsrmax = finet[i+1]; 600 } 601 } 602 STAILQ_FOREACH(fx, &funixes, next) 603 if (fx->s > fdsrmax) 604 fdsrmax = fx->s; 605 606 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 607 sizeof(fd_mask)); 608 if (fdsr == NULL) 609 errx(1, "calloc fd_set"); 610 611 for (;;) { 612 if (MarkSet) 613 markit(); 614 if (WantDie) 615 die(WantDie); 616 617 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 618 sizeof(fd_mask)); 619 620 if (fklog != -1) 621 FD_SET(fklog, fdsr); 622 if (finet && !SecureMode) { 623 for (i = 0; i < *finet; i++) { 624 if (finet[i+1] != -1) 625 FD_SET(finet[i+1], fdsr); 626 } 627 } 628 STAILQ_FOREACH(fx, &funixes, next) 629 FD_SET(fx->s, fdsr); 630 631 i = select(fdsrmax+1, fdsr, NULL, NULL, 632 needdofsync ? &tv : tvp); 633 switch (i) { 634 case 0: 635 dofsync(); 636 needdofsync = 0; 637 if (tvp) { 638 tvp = NULL; 639 if (ppid != 1) 640 kill(ppid, SIGALRM); 641 } 642 continue; 643 case -1: 644 if (errno != EINTR) 645 logerror("select"); 646 continue; 647 } 648 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 649 readklog(); 650 if (finet && !SecureMode) { 651 for (i = 0; i < *finet; i++) { 652 if (FD_ISSET(finet[i+1], fdsr)) { 653 len = sizeof(frominet); 654 l = recvfrom(finet[i+1], line, MAXLINE, 655 0, (struct sockaddr *)&frominet, 656 &len); 657 if (l > 0) { 658 line[l] = '\0'; 659 hname = cvthname((struct sockaddr *)&frominet); 660 unmapped((struct sockaddr *)&frominet); 661 if (validate((struct sockaddr *)&frominet, hname)) 662 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 663 } else if (l < 0 && errno != EINTR) 664 logerror("recvfrom inet"); 665 } 666 } 667 } 668 STAILQ_FOREACH(fx, &funixes, next) { 669 if (FD_ISSET(fx->s, fdsr)) { 670 len = sizeof(fromunix); 671 l = recvfrom(fx->s, line, MAXLINE, 0, 672 (struct sockaddr *)&fromunix, &len); 673 if (l > 0) { 674 line[l] = '\0'; 675 printline(LocalHostName, line, 0); 676 } else if (l < 0 && errno != EINTR) 677 logerror("recvfrom unix"); 678 } 679 } 680 } 681 if (fdsr) 682 free(fdsr); 683 } 684 685 static void 686 unmapped(struct sockaddr *sa) 687 { 688 struct sockaddr_in6 *sin6; 689 struct sockaddr_in sin4; 690 691 if (sa->sa_family != AF_INET6) 692 return; 693 if (sa->sa_len != sizeof(struct sockaddr_in6) || 694 sizeof(sin4) > sa->sa_len) 695 return; 696 sin6 = (struct sockaddr_in6 *)sa; 697 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 698 return; 699 700 memset(&sin4, 0, sizeof(sin4)); 701 sin4.sin_family = AF_INET; 702 sin4.sin_len = sizeof(struct sockaddr_in); 703 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 704 sizeof(sin4.sin_addr)); 705 sin4.sin_port = sin6->sin6_port; 706 707 memcpy(sa, &sin4, sin4.sin_len); 708 } 709 710 static void 711 usage(void) 712 { 713 714 fprintf(stderr, "%s\n%s\n%s\n%s\n", 715 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 716 " [-b bind_address] [-f config_file]", 717 " [-l [mode:]path] [-m mark_interval]", 718 " [-P pid_file] [-p log_socket]"); 719 exit(1); 720 } 721 722 /* 723 * Take a raw input line, decode the message, and print the message 724 * on the appropriate log files. 725 */ 726 static void 727 printline(const char *hname, char *msg, int flags) 728 { 729 char *p, *q; 730 long n; 731 int c, pri; 732 char line[MAXLINE + 1]; 733 734 /* test for special codes */ 735 p = msg; 736 pri = DEFUPRI; 737 if (*p == '<') { 738 errno = 0; 739 n = strtol(p + 1, &q, 10); 740 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 741 p = q + 1; 742 pri = n; 743 } 744 } 745 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 746 pri = DEFUPRI; 747 748 /* 749 * Don't allow users to log kernel messages. 750 * NOTE: since LOG_KERN == 0 this will also match 751 * messages with no facility specified. 752 */ 753 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 754 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 755 756 q = line; 757 758 while ((c = (unsigned char)*p++) != '\0' && 759 q < &line[sizeof(line) - 4]) { 760 if (mask_C1 && (c & 0x80) && c < 0xA0) { 761 c &= 0x7F; 762 *q++ = 'M'; 763 *q++ = '-'; 764 } 765 if (isascii(c) && iscntrl(c)) { 766 if (c == '\n') { 767 *q++ = ' '; 768 } else if (c == '\t') { 769 *q++ = '\t'; 770 } else { 771 *q++ = '^'; 772 *q++ = c ^ 0100; 773 } 774 } else { 775 *q++ = c; 776 } 777 } 778 *q = '\0'; 779 780 logmsg(pri, line, hname, flags); 781 } 782 783 /* 784 * Read /dev/klog while data are available, split into lines. 785 */ 786 static void 787 readklog(void) 788 { 789 char *p, *q, line[MAXLINE + 1]; 790 int len, i; 791 792 len = 0; 793 for (;;) { 794 i = read(fklog, line + len, MAXLINE - 1 - len); 795 if (i > 0) { 796 line[i + len] = '\0'; 797 } else { 798 if (i < 0 && errno != EINTR && errno != EAGAIN) { 799 logerror("klog"); 800 fklog = -1; 801 } 802 break; 803 } 804 805 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 806 *q = '\0'; 807 printsys(p); 808 } 809 len = strlen(p); 810 if (len >= MAXLINE - 1) { 811 printsys(p); 812 len = 0; 813 } 814 if (len > 0) 815 memmove(line, p, len + 1); 816 } 817 if (len > 0) 818 printsys(line); 819 } 820 821 /* 822 * Take a raw input line from /dev/klog, format similar to syslog(). 823 */ 824 static void 825 printsys(char *msg) 826 { 827 char *p, *q; 828 long n; 829 int flags, isprintf, pri; 830 831 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 832 p = msg; 833 pri = DEFSPRI; 834 isprintf = 1; 835 if (*p == '<') { 836 errno = 0; 837 n = strtol(p + 1, &q, 10); 838 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 839 p = q + 1; 840 pri = n; 841 isprintf = 0; 842 } 843 } 844 /* 845 * Kernel printf's and LOG_CONSOLE messages have been displayed 846 * on the console already. 847 */ 848 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 849 flags |= IGN_CONS; 850 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 851 pri = DEFSPRI; 852 logmsg(pri, p, LocalHostName, flags); 853 } 854 855 static time_t now; 856 857 /* 858 * Match a program or host name against a specification. 859 * Return a non-0 value if the message must be ignored 860 * based on the specification. 861 */ 862 static int 863 skip_message(const char *name, const char *spec, int checkcase) 864 { 865 const char *s; 866 char prev, next; 867 int exclude = 0; 868 /* Behaviour on explicit match */ 869 870 if (spec == NULL) 871 return 0; 872 switch (*spec) { 873 case '-': 874 exclude = 1; 875 /*FALLTHROUGH*/ 876 case '+': 877 spec++; 878 break; 879 default: 880 break; 881 } 882 if (checkcase) 883 s = strstr (spec, name); 884 else 885 s = strcasestr (spec, name); 886 887 if (s != NULL) { 888 prev = (s == spec ? ',' : *(s - 1)); 889 next = *(s + strlen (name)); 890 891 if (prev == ',' && (next == '\0' || next == ',')) 892 /* Explicit match: skip iff the spec is an 893 exclusive one. */ 894 return exclude; 895 } 896 897 /* No explicit match for this name: skip the message iff 898 the spec is an inclusive one. */ 899 return !exclude; 900 } 901 902 /* 903 * Log a message to the appropriate log files, users, etc. based on 904 * the priority. 905 */ 906 static void 907 logmsg(int pri, const char *msg, const char *from, int flags) 908 { 909 struct filed *f; 910 int i, fac, msglen, omask, prilev; 911 const char *timestamp; 912 char prog[NAME_MAX+1]; 913 char buf[MAXLINE+1]; 914 915 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 916 pri, flags, from, msg); 917 918 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 919 920 /* 921 * Check to see if msg looks non-standard. 922 */ 923 msglen = strlen(msg); 924 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 925 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 926 flags |= ADDDATE; 927 928 (void)time(&now); 929 if (flags & ADDDATE) { 930 timestamp = ctime(&now) + 4; 931 } else { 932 timestamp = msg; 933 msg += 16; 934 msglen -= 16; 935 } 936 937 /* skip leading blanks */ 938 while (isspace(*msg)) { 939 msg++; 940 msglen--; 941 } 942 943 /* extract facility and priority level */ 944 if (flags & MARK) 945 fac = LOG_NFACILITIES; 946 else 947 fac = LOG_FAC(pri); 948 949 /* Check maximum facility number. */ 950 if (fac > LOG_NFACILITIES) { 951 (void)sigsetmask(omask); 952 return; 953 } 954 955 prilev = LOG_PRI(pri); 956 957 /* extract program name */ 958 for (i = 0; i < NAME_MAX; i++) { 959 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 960 msg[i] == '/' || isspace(msg[i])) 961 break; 962 prog[i] = msg[i]; 963 } 964 prog[i] = 0; 965 966 /* add kernel prefix for kernel messages */ 967 if (flags & ISKERNEL) { 968 snprintf(buf, sizeof(buf), "%s: %s", 969 use_bootfile ? bootfile : "kernel", msg); 970 msg = buf; 971 msglen = strlen(buf); 972 } 973 974 /* log the message to the particular outputs */ 975 if (!Initialized) { 976 f = &consfile; 977 /* 978 * Open in non-blocking mode to avoid hangs during open 979 * and close(waiting for the port to drain). 980 */ 981 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 982 983 if (f->f_file >= 0) { 984 (void)strlcpy(f->f_lasttime, timestamp, 985 sizeof(f->f_lasttime)); 986 fprintlog(f, flags, msg); 987 (void)close(f->f_file); 988 } 989 (void)sigsetmask(omask); 990 return; 991 } 992 for (f = Files; f; f = f->f_next) { 993 /* skip messages that are incorrect priority */ 994 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 995 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 996 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 997 ) 998 || f->f_pmask[fac] == INTERNAL_NOPRI) 999 continue; 1000 1001 /* skip messages with the incorrect hostname */ 1002 if (skip_message(from, f->f_host, 0)) 1003 continue; 1004 1005 /* skip messages with the incorrect program name */ 1006 if (skip_message(prog, f->f_program, 1)) 1007 continue; 1008 1009 /* skip message to console if it has already been printed */ 1010 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1011 continue; 1012 1013 /* don't output marks to recently written files */ 1014 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1015 continue; 1016 1017 /* 1018 * suppress duplicate lines to this file 1019 */ 1020 if (no_compress - (f->f_type != F_PIPE) < 1 && 1021 (flags & MARK) == 0 && msglen == f->f_prevlen && 1022 f->f_prevline && !strcmp(msg, f->f_prevline) && 1023 !strcasecmp(from, f->f_prevhost)) { 1024 (void)strlcpy(f->f_lasttime, timestamp, 1025 sizeof(f->f_lasttime)); 1026 f->f_prevcount++; 1027 dprintf("msg repeated %d times, %ld sec of %d\n", 1028 f->f_prevcount, (long)(now - f->f_time), 1029 repeatinterval[f->f_repeatcount]); 1030 /* 1031 * If domark would have logged this by now, 1032 * flush it now (so we don't hold isolated messages), 1033 * but back off so we'll flush less often 1034 * in the future. 1035 */ 1036 if (now > REPEATTIME(f)) { 1037 fprintlog(f, flags, (char *)NULL); 1038 BACKOFF(f); 1039 } 1040 } else { 1041 /* new line, save it */ 1042 if (f->f_prevcount) 1043 fprintlog(f, 0, (char *)NULL); 1044 f->f_repeatcount = 0; 1045 f->f_prevpri = pri; 1046 (void)strlcpy(f->f_lasttime, timestamp, 1047 sizeof(f->f_lasttime)); 1048 (void)strlcpy(f->f_prevhost, from, 1049 sizeof(f->f_prevhost)); 1050 if (msglen < MAXSVLINE) { 1051 f->f_prevlen = msglen; 1052 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1053 fprintlog(f, flags, (char *)NULL); 1054 } else { 1055 f->f_prevline[0] = 0; 1056 f->f_prevlen = 0; 1057 fprintlog(f, flags, msg); 1058 } 1059 } 1060 } 1061 (void)sigsetmask(omask); 1062 } 1063 1064 static void 1065 dofsync(void) 1066 { 1067 struct filed *f; 1068 1069 for (f = Files; f; f = f->f_next) { 1070 if ((f->f_type == F_FILE) && 1071 (f->f_flags & FFLAG_NEEDSYNC)) { 1072 f->f_flags &= ~FFLAG_NEEDSYNC; 1073 (void)fsync(f->f_file); 1074 } 1075 } 1076 } 1077 1078 #define IOV_SIZE 7 1079 static void 1080 fprintlog(struct filed *f, int flags, const char *msg) 1081 { 1082 struct iovec iov[IOV_SIZE]; 1083 struct iovec *v; 1084 struct addrinfo *r; 1085 int i, l, lsent = 0; 1086 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1087 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1088 const char *msgret; 1089 1090 v = iov; 1091 if (f->f_type == F_WALL) { 1092 v->iov_base = greetings; 1093 /* The time displayed is not synchornized with the other log 1094 * destinations (like messages). Following fragment was using 1095 * ctime(&now), which was updating the time every 30 sec. 1096 * With f_lasttime, time is synchronized correctly. 1097 */ 1098 v->iov_len = snprintf(greetings, sizeof greetings, 1099 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1100 f->f_prevhost, f->f_lasttime); 1101 if (v->iov_len >= sizeof greetings) 1102 v->iov_len = sizeof greetings - 1; 1103 v++; 1104 v->iov_base = nul; 1105 v->iov_len = 0; 1106 v++; 1107 } else { 1108 v->iov_base = f->f_lasttime; 1109 v->iov_len = strlen(f->f_lasttime); 1110 v++; 1111 v->iov_base = space; 1112 v->iov_len = 1; 1113 v++; 1114 } 1115 1116 if (LogFacPri) { 1117 static char fp_buf[30]; /* Hollow laugh */ 1118 int fac = f->f_prevpri & LOG_FACMASK; 1119 int pri = LOG_PRI(f->f_prevpri); 1120 const char *f_s = NULL; 1121 char f_n[5]; /* Hollow laugh */ 1122 const char *p_s = NULL; 1123 char p_n[5]; /* Hollow laugh */ 1124 1125 if (LogFacPri > 1) { 1126 const CODE *c; 1127 1128 for (c = facilitynames; c->c_name; c++) { 1129 if (c->c_val == fac) { 1130 f_s = c->c_name; 1131 break; 1132 } 1133 } 1134 for (c = prioritynames; c->c_name; c++) { 1135 if (c->c_val == pri) { 1136 p_s = c->c_name; 1137 break; 1138 } 1139 } 1140 } 1141 if (!f_s) { 1142 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1143 f_s = f_n; 1144 } 1145 if (!p_s) { 1146 snprintf(p_n, sizeof p_n, "%d", pri); 1147 p_s = p_n; 1148 } 1149 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1150 v->iov_base = fp_buf; 1151 v->iov_len = strlen(fp_buf); 1152 } else { 1153 v->iov_base = nul; 1154 v->iov_len = 0; 1155 } 1156 v++; 1157 1158 v->iov_base = f->f_prevhost; 1159 v->iov_len = strlen(v->iov_base); 1160 v++; 1161 v->iov_base = space; 1162 v->iov_len = 1; 1163 v++; 1164 1165 if (msg) { 1166 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1167 if (wmsg == NULL) { 1168 logerror("strdup"); 1169 exit(1); 1170 } 1171 v->iov_base = wmsg; 1172 v->iov_len = strlen(msg); 1173 } else if (f->f_prevcount > 1) { 1174 v->iov_base = repbuf; 1175 v->iov_len = snprintf(repbuf, sizeof repbuf, 1176 "last message repeated %d times", f->f_prevcount); 1177 } else if (f->f_prevline) { 1178 v->iov_base = f->f_prevline; 1179 v->iov_len = f->f_prevlen; 1180 } else { 1181 return; 1182 } 1183 v++; 1184 1185 dprintf("Logging to %s", TypeNames[f->f_type]); 1186 f->f_time = now; 1187 1188 switch (f->f_type) { 1189 int port; 1190 case F_UNUSED: 1191 dprintf("\n"); 1192 break; 1193 1194 case F_FORW: 1195 port = (int)ntohs(((struct sockaddr_in *) 1196 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1197 if (port != 514) { 1198 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1199 } else { 1200 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1201 } 1202 /* check for local vs remote messages */ 1203 if (strcasecmp(f->f_prevhost, LocalHostName)) 1204 l = snprintf(line, sizeof line - 1, 1205 "<%d>%.15s Forwarded from %s: %s", 1206 f->f_prevpri, (char *)iov[0].iov_base, 1207 f->f_prevhost, (char *)iov[5].iov_base); 1208 else 1209 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1210 f->f_prevpri, (char *)iov[0].iov_base, 1211 (char *)iov[5].iov_base); 1212 if (l < 0) 1213 l = 0; 1214 else if (l > MAXLINE) 1215 l = MAXLINE; 1216 1217 if (finet) { 1218 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1219 for (i = 0; i < *finet; i++) { 1220 #if 0 1221 /* 1222 * should we check AF first, or just 1223 * trial and error? FWD 1224 */ 1225 if (r->ai_family == 1226 address_family_of(finet[i+1])) 1227 #endif 1228 lsent = sendto(finet[i+1], line, l, 0, 1229 r->ai_addr, r->ai_addrlen); 1230 if (lsent == l) 1231 break; 1232 } 1233 if (lsent == l && !send_to_all) 1234 break; 1235 } 1236 dprintf("lsent/l: %d/%d\n", lsent, l); 1237 if (lsent != l) { 1238 int e = errno; 1239 logerror("sendto"); 1240 errno = e; 1241 switch (errno) { 1242 case ENOBUFS: 1243 case ENETDOWN: 1244 case EHOSTUNREACH: 1245 case EHOSTDOWN: 1246 break; 1247 /* case EBADF: */ 1248 /* case EACCES: */ 1249 /* case ENOTSOCK: */ 1250 /* case EFAULT: */ 1251 /* case EMSGSIZE: */ 1252 /* case EAGAIN: */ 1253 /* case ENOBUFS: */ 1254 /* case ECONNREFUSED: */ 1255 default: 1256 dprintf("removing entry\n"); 1257 f->f_type = F_UNUSED; 1258 break; 1259 } 1260 } 1261 } 1262 break; 1263 1264 case F_FILE: 1265 dprintf(" %s\n", f->f_un.f_fname); 1266 v->iov_base = lf; 1267 v->iov_len = 1; 1268 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1269 /* 1270 * If writev(2) fails for potentially transient errors 1271 * like the filesystem being full, ignore it. 1272 * Otherwise remove this logfile from the list. 1273 */ 1274 if (errno != ENOSPC) { 1275 int e = errno; 1276 (void)close(f->f_file); 1277 f->f_type = F_UNUSED; 1278 errno = e; 1279 logerror(f->f_un.f_fname); 1280 } 1281 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1282 f->f_flags |= FFLAG_NEEDSYNC; 1283 needdofsync = 1; 1284 } 1285 break; 1286 1287 case F_PIPE: 1288 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1289 v->iov_base = lf; 1290 v->iov_len = 1; 1291 if (f->f_un.f_pipe.f_pid == 0) { 1292 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1293 &f->f_un.f_pipe.f_pid)) < 0) { 1294 f->f_type = F_UNUSED; 1295 logerror(f->f_un.f_pipe.f_pname); 1296 break; 1297 } 1298 } 1299 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1300 int e = errno; 1301 (void)close(f->f_file); 1302 if (f->f_un.f_pipe.f_pid > 0) 1303 deadq_enter(f->f_un.f_pipe.f_pid, 1304 f->f_un.f_pipe.f_pname); 1305 f->f_un.f_pipe.f_pid = 0; 1306 errno = e; 1307 logerror(f->f_un.f_pipe.f_pname); 1308 } 1309 break; 1310 1311 case F_CONSOLE: 1312 if (flags & IGN_CONS) { 1313 dprintf(" (ignored)\n"); 1314 break; 1315 } 1316 /* FALLTHROUGH */ 1317 1318 case F_TTY: 1319 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1320 v->iov_base = crlf; 1321 v->iov_len = 2; 1322 1323 errno = 0; /* ttymsg() only sometimes returns an errno */ 1324 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1325 f->f_type = F_UNUSED; 1326 logerror(msgret); 1327 } 1328 break; 1329 1330 case F_USERS: 1331 case F_WALL: 1332 dprintf("\n"); 1333 v->iov_base = crlf; 1334 v->iov_len = 2; 1335 wallmsg(f, iov, IOV_SIZE); 1336 break; 1337 } 1338 f->f_prevcount = 0; 1339 free(wmsg); 1340 } 1341 1342 /* 1343 * WALLMSG -- Write a message to the world at large 1344 * 1345 * Write the specified message to either the entire 1346 * world, or a list of approved users. 1347 */ 1348 static void 1349 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1350 { 1351 static int reenter; /* avoid calling ourselves */ 1352 struct utmpx *ut; 1353 int i; 1354 const char *p; 1355 1356 if (reenter++) 1357 return; 1358 setutxent(); 1359 /* NOSTRICT */ 1360 while ((ut = getutxent()) != NULL) { 1361 if (ut->ut_type != USER_PROCESS) 1362 continue; 1363 if (f->f_type == F_WALL) { 1364 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1365 TTYMSGTIME)) != NULL) { 1366 errno = 0; /* already in msg */ 1367 logerror(p); 1368 } 1369 continue; 1370 } 1371 /* should we send the message to this user? */ 1372 for (i = 0; i < MAXUNAMES; i++) { 1373 if (!f->f_un.f_uname[i][0]) 1374 break; 1375 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1376 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1377 TTYMSGTIME)) != NULL) { 1378 errno = 0; /* already in msg */ 1379 logerror(p); 1380 } 1381 break; 1382 } 1383 } 1384 } 1385 endutxent(); 1386 reenter = 0; 1387 } 1388 1389 static void 1390 reapchild(int signo __unused) 1391 { 1392 int status; 1393 pid_t pid; 1394 struct filed *f; 1395 1396 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1397 if (!Initialized) 1398 /* Don't tell while we are initting. */ 1399 continue; 1400 1401 /* First, look if it's a process from the dead queue. */ 1402 if (deadq_remove(pid)) 1403 goto oncemore; 1404 1405 /* Now, look in list of active processes. */ 1406 for (f = Files; f; f = f->f_next) 1407 if (f->f_type == F_PIPE && 1408 f->f_un.f_pipe.f_pid == pid) { 1409 (void)close(f->f_file); 1410 f->f_un.f_pipe.f_pid = 0; 1411 log_deadchild(pid, status, 1412 f->f_un.f_pipe.f_pname); 1413 break; 1414 } 1415 oncemore: 1416 continue; 1417 } 1418 } 1419 1420 /* 1421 * Return a printable representation of a host address. 1422 */ 1423 static const char * 1424 cvthname(struct sockaddr *f) 1425 { 1426 int error, hl; 1427 sigset_t omask, nmask; 1428 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1429 1430 error = getnameinfo((struct sockaddr *)f, 1431 ((struct sockaddr *)f)->sa_len, 1432 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1433 dprintf("cvthname(%s)\n", ip); 1434 1435 if (error) { 1436 dprintf("Malformed from address %s\n", gai_strerror(error)); 1437 return ("???"); 1438 } 1439 if (!resolve) 1440 return (ip); 1441 1442 sigemptyset(&nmask); 1443 sigaddset(&nmask, SIGHUP); 1444 sigprocmask(SIG_BLOCK, &nmask, &omask); 1445 error = getnameinfo((struct sockaddr *)f, 1446 ((struct sockaddr *)f)->sa_len, 1447 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1448 sigprocmask(SIG_SETMASK, &omask, NULL); 1449 if (error) { 1450 dprintf("Host name for your address (%s) unknown\n", ip); 1451 return (ip); 1452 } 1453 hl = strlen(hname); 1454 if (hl > 0 && hname[hl-1] == '.') 1455 hname[--hl] = '\0'; 1456 trimdomain(hname, hl); 1457 return (hname); 1458 } 1459 1460 static void 1461 dodie(int signo) 1462 { 1463 1464 WantDie = signo; 1465 } 1466 1467 static void 1468 domark(int signo __unused) 1469 { 1470 1471 MarkSet = 1; 1472 } 1473 1474 /* 1475 * Print syslogd errors some place. 1476 */ 1477 static void 1478 logerror(const char *type) 1479 { 1480 char buf[512]; 1481 static int recursed = 0; 1482 1483 /* If there's an error while trying to log an error, give up. */ 1484 if (recursed) 1485 return; 1486 recursed++; 1487 if (errno) 1488 (void)snprintf(buf, 1489 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1490 else 1491 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1492 errno = 0; 1493 dprintf("%s\n", buf); 1494 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1495 recursed--; 1496 } 1497 1498 static void 1499 die(int signo) 1500 { 1501 struct filed *f; 1502 struct funix *fx; 1503 int was_initialized; 1504 char buf[100]; 1505 1506 was_initialized = Initialized; 1507 Initialized = 0; /* Don't log SIGCHLDs. */ 1508 for (f = Files; f != NULL; f = f->f_next) { 1509 /* flush any pending output */ 1510 if (f->f_prevcount) 1511 fprintlog(f, 0, (char *)NULL); 1512 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1513 (void)close(f->f_file); 1514 f->f_un.f_pipe.f_pid = 0; 1515 } 1516 } 1517 Initialized = was_initialized; 1518 if (signo) { 1519 dprintf("syslogd: exiting on signal %d\n", signo); 1520 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1521 errno = 0; 1522 logerror(buf); 1523 } 1524 STAILQ_FOREACH(fx, &funixes, next) 1525 (void)unlink(fx->name); 1526 pidfile_remove(pfh); 1527 1528 exit(1); 1529 } 1530 1531 /* 1532 * INIT -- Initialize syslogd from configuration table 1533 */ 1534 static void 1535 init(int signo) 1536 { 1537 int i; 1538 FILE *cf; 1539 struct filed *f, *next, **nextp; 1540 char *p; 1541 char cline[LINE_MAX]; 1542 char prog[NAME_MAX+1]; 1543 char host[MAXHOSTNAMELEN]; 1544 char oldLocalHostName[MAXHOSTNAMELEN]; 1545 char hostMsg[2*MAXHOSTNAMELEN+40]; 1546 char bootfileMsg[LINE_MAX]; 1547 1548 dprintf("init\n"); 1549 1550 /* 1551 * Load hostname (may have changed). 1552 */ 1553 if (signo != 0) 1554 (void)strlcpy(oldLocalHostName, LocalHostName, 1555 sizeof(oldLocalHostName)); 1556 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1557 err(EX_OSERR, "gethostname() failed"); 1558 if ((p = strchr(LocalHostName, '.')) != NULL) { 1559 *p++ = '\0'; 1560 LocalDomain = p; 1561 } else { 1562 LocalDomain = ""; 1563 } 1564 1565 /* 1566 * Close all open log files. 1567 */ 1568 Initialized = 0; 1569 for (f = Files; f != NULL; f = next) { 1570 /* flush any pending output */ 1571 if (f->f_prevcount) 1572 fprintlog(f, 0, (char *)NULL); 1573 1574 switch (f->f_type) { 1575 case F_FILE: 1576 case F_FORW: 1577 case F_CONSOLE: 1578 case F_TTY: 1579 (void)close(f->f_file); 1580 break; 1581 case F_PIPE: 1582 if (f->f_un.f_pipe.f_pid > 0) { 1583 (void)close(f->f_file); 1584 deadq_enter(f->f_un.f_pipe.f_pid, 1585 f->f_un.f_pipe.f_pname); 1586 } 1587 f->f_un.f_pipe.f_pid = 0; 1588 break; 1589 } 1590 next = f->f_next; 1591 if (f->f_program) free(f->f_program); 1592 if (f->f_host) free(f->f_host); 1593 free((char *)f); 1594 } 1595 Files = NULL; 1596 nextp = &Files; 1597 1598 /* open the configuration file */ 1599 if ((cf = fopen(ConfFile, "r")) == NULL) { 1600 dprintf("cannot open %s\n", ConfFile); 1601 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1602 if (*nextp == NULL) { 1603 logerror("calloc"); 1604 exit(1); 1605 } 1606 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1607 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1608 if ((*nextp)->f_next == NULL) { 1609 logerror("calloc"); 1610 exit(1); 1611 } 1612 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1613 Initialized = 1; 1614 return; 1615 } 1616 1617 /* 1618 * Foreach line in the conf table, open that file. 1619 */ 1620 f = NULL; 1621 (void)strlcpy(host, "*", sizeof(host)); 1622 (void)strlcpy(prog, "*", sizeof(prog)); 1623 while (fgets(cline, sizeof(cline), cf) != NULL) { 1624 /* 1625 * check for end-of-section, comments, strip off trailing 1626 * spaces and newline character. #!prog is treated specially: 1627 * following lines apply only to that program. 1628 */ 1629 for (p = cline; isspace(*p); ++p) 1630 continue; 1631 if (*p == 0) 1632 continue; 1633 if (*p == '#') { 1634 p++; 1635 if (*p != '!' && *p != '+' && *p != '-') 1636 continue; 1637 } 1638 if (*p == '+' || *p == '-') { 1639 host[0] = *p++; 1640 while (isspace(*p)) 1641 p++; 1642 if ((!*p) || (*p == '*')) { 1643 (void)strlcpy(host, "*", sizeof(host)); 1644 continue; 1645 } 1646 if (*p == '@') 1647 p = LocalHostName; 1648 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1649 if (!isalnum(*p) && *p != '.' && *p != '-' 1650 && *p != ',' && *p != ':' && *p != '%') 1651 break; 1652 host[i] = *p++; 1653 } 1654 host[i] = '\0'; 1655 continue; 1656 } 1657 if (*p == '!') { 1658 p++; 1659 while (isspace(*p)) p++; 1660 if ((!*p) || (*p == '*')) { 1661 (void)strlcpy(prog, "*", sizeof(prog)); 1662 continue; 1663 } 1664 for (i = 0; i < NAME_MAX; i++) { 1665 if (!isprint(p[i]) || isspace(p[i])) 1666 break; 1667 prog[i] = p[i]; 1668 } 1669 prog[i] = 0; 1670 continue; 1671 } 1672 for (p = cline + 1; *p != '\0'; p++) { 1673 if (*p != '#') 1674 continue; 1675 if (*(p - 1) == '\\') { 1676 strcpy(p - 1, p); 1677 p--; 1678 continue; 1679 } 1680 *p = '\0'; 1681 break; 1682 } 1683 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1684 cline[i] = '\0'; 1685 f = (struct filed *)calloc(1, sizeof(*f)); 1686 if (f == NULL) { 1687 logerror("calloc"); 1688 exit(1); 1689 } 1690 *nextp = f; 1691 nextp = &f->f_next; 1692 cfline(cline, f, prog, host); 1693 } 1694 1695 /* close the configuration file */ 1696 (void)fclose(cf); 1697 1698 Initialized = 1; 1699 1700 if (Debug) { 1701 int port; 1702 for (f = Files; f; f = f->f_next) { 1703 for (i = 0; i <= LOG_NFACILITIES; i++) 1704 if (f->f_pmask[i] == INTERNAL_NOPRI) 1705 printf("X "); 1706 else 1707 printf("%d ", f->f_pmask[i]); 1708 printf("%s: ", TypeNames[f->f_type]); 1709 switch (f->f_type) { 1710 case F_FILE: 1711 printf("%s", f->f_un.f_fname); 1712 break; 1713 1714 case F_CONSOLE: 1715 case F_TTY: 1716 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1717 break; 1718 1719 case F_FORW: 1720 port = (int)ntohs(((struct sockaddr_in *) 1721 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1722 if (port != 514) { 1723 printf("%s:%d", 1724 f->f_un.f_forw.f_hname, port); 1725 } else { 1726 printf("%s", f->f_un.f_forw.f_hname); 1727 } 1728 break; 1729 1730 case F_PIPE: 1731 printf("%s", f->f_un.f_pipe.f_pname); 1732 break; 1733 1734 case F_USERS: 1735 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1736 printf("%s, ", f->f_un.f_uname[i]); 1737 break; 1738 } 1739 if (f->f_program) 1740 printf(" (%s)", f->f_program); 1741 printf("\n"); 1742 } 1743 } 1744 1745 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1746 dprintf("syslogd: restarted\n"); 1747 /* 1748 * Log a change in hostname, but only on a restart. 1749 */ 1750 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1751 (void)snprintf(hostMsg, sizeof(hostMsg), 1752 "syslogd: hostname changed, \"%s\" to \"%s\"", 1753 oldLocalHostName, LocalHostName); 1754 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1755 dprintf("%s\n", hostMsg); 1756 } 1757 /* 1758 * Log the kernel boot file if we aren't going to use it as 1759 * the prefix, and if this is *not* a restart. 1760 */ 1761 if (signo == 0 && !use_bootfile) { 1762 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1763 "syslogd: kernel boot file is %s", bootfile); 1764 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1765 dprintf("%s\n", bootfileMsg); 1766 } 1767 } 1768 1769 /* 1770 * Crack a configuration file line 1771 */ 1772 static void 1773 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1774 { 1775 struct addrinfo hints, *res; 1776 int error, i, pri, syncfile; 1777 const char *p, *q; 1778 char *bp; 1779 char buf[MAXLINE], ebuf[100]; 1780 1781 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1782 1783 errno = 0; /* keep strerror() stuff out of logerror messages */ 1784 1785 /* clear out file entry */ 1786 memset(f, 0, sizeof(*f)); 1787 for (i = 0; i <= LOG_NFACILITIES; i++) 1788 f->f_pmask[i] = INTERNAL_NOPRI; 1789 1790 /* save hostname if any */ 1791 if (host && *host == '*') 1792 host = NULL; 1793 if (host) { 1794 int hl; 1795 1796 f->f_host = strdup(host); 1797 if (f->f_host == NULL) { 1798 logerror("strdup"); 1799 exit(1); 1800 } 1801 hl = strlen(f->f_host); 1802 if (hl > 0 && f->f_host[hl-1] == '.') 1803 f->f_host[--hl] = '\0'; 1804 trimdomain(f->f_host, hl); 1805 } 1806 1807 /* save program name if any */ 1808 if (prog && *prog == '*') 1809 prog = NULL; 1810 if (prog) { 1811 f->f_program = strdup(prog); 1812 if (f->f_program == NULL) { 1813 logerror("strdup"); 1814 exit(1); 1815 } 1816 } 1817 1818 /* scan through the list of selectors */ 1819 for (p = line; *p && *p != '\t' && *p != ' ';) { 1820 int pri_done; 1821 int pri_cmp; 1822 int pri_invert; 1823 1824 /* find the end of this facility name list */ 1825 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1826 continue; 1827 1828 /* get the priority comparison */ 1829 pri_cmp = 0; 1830 pri_done = 0; 1831 pri_invert = 0; 1832 if (*q == '!') { 1833 pri_invert = 1; 1834 q++; 1835 } 1836 while (!pri_done) { 1837 switch (*q) { 1838 case '<': 1839 pri_cmp |= PRI_LT; 1840 q++; 1841 break; 1842 case '=': 1843 pri_cmp |= PRI_EQ; 1844 q++; 1845 break; 1846 case '>': 1847 pri_cmp |= PRI_GT; 1848 q++; 1849 break; 1850 default: 1851 pri_done++; 1852 break; 1853 } 1854 } 1855 1856 /* collect priority name */ 1857 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1858 *bp++ = *q++; 1859 *bp = '\0'; 1860 1861 /* skip cruft */ 1862 while (strchr(",;", *q)) 1863 q++; 1864 1865 /* decode priority name */ 1866 if (*buf == '*') { 1867 pri = LOG_PRIMASK; 1868 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1869 } else { 1870 /* Ignore trailing spaces. */ 1871 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1872 buf[i] = '\0'; 1873 1874 pri = decode(buf, prioritynames); 1875 if (pri < 0) { 1876 errno = 0; 1877 (void)snprintf(ebuf, sizeof ebuf, 1878 "unknown priority name \"%s\"", buf); 1879 logerror(ebuf); 1880 return; 1881 } 1882 } 1883 if (!pri_cmp) 1884 pri_cmp = (UniquePriority) 1885 ? (PRI_EQ) 1886 : (PRI_EQ | PRI_GT) 1887 ; 1888 if (pri_invert) 1889 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1890 1891 /* scan facilities */ 1892 while (*p && !strchr("\t.; ", *p)) { 1893 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1894 *bp++ = *p++; 1895 *bp = '\0'; 1896 1897 if (*buf == '*') { 1898 for (i = 0; i < LOG_NFACILITIES; i++) { 1899 f->f_pmask[i] = pri; 1900 f->f_pcmp[i] = pri_cmp; 1901 } 1902 } else { 1903 i = decode(buf, facilitynames); 1904 if (i < 0) { 1905 errno = 0; 1906 (void)snprintf(ebuf, sizeof ebuf, 1907 "unknown facility name \"%s\"", 1908 buf); 1909 logerror(ebuf); 1910 return; 1911 } 1912 f->f_pmask[i >> 3] = pri; 1913 f->f_pcmp[i >> 3] = pri_cmp; 1914 } 1915 while (*p == ',' || *p == ' ') 1916 p++; 1917 } 1918 1919 p = q; 1920 } 1921 1922 /* skip to action part */ 1923 while (*p == '\t' || *p == ' ') 1924 p++; 1925 1926 if (*p == '-') { 1927 syncfile = 0; 1928 p++; 1929 } else 1930 syncfile = 1; 1931 1932 switch (*p) { 1933 case '@': 1934 { 1935 char *tp; 1936 char endkey = ':'; 1937 /* 1938 * scan forward to see if there is a port defined. 1939 * so we can't use strlcpy.. 1940 */ 1941 i = sizeof(f->f_un.f_forw.f_hname); 1942 tp = f->f_un.f_forw.f_hname; 1943 p++; 1944 1945 /* 1946 * an ipv6 address should start with a '[' in that case 1947 * we should scan for a ']' 1948 */ 1949 if (*p == '[') { 1950 p++; 1951 endkey = ']'; 1952 } 1953 while (*p && (*p != endkey) && (i-- > 0)) { 1954 *tp++ = *p++; 1955 } 1956 if (endkey == ']' && *p == endkey) 1957 p++; 1958 *tp = '\0'; 1959 } 1960 /* See if we copied a domain and have a port */ 1961 if (*p == ':') 1962 p++; 1963 else 1964 p = NULL; 1965 1966 memset(&hints, 0, sizeof(hints)); 1967 hints.ai_family = family; 1968 hints.ai_socktype = SOCK_DGRAM; 1969 error = getaddrinfo(f->f_un.f_forw.f_hname, 1970 p ? p : "syslog", &hints, &res); 1971 if (error) { 1972 logerror(gai_strerror(error)); 1973 break; 1974 } 1975 f->f_un.f_forw.f_addr = res; 1976 f->f_type = F_FORW; 1977 break; 1978 1979 case '/': 1980 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1981 f->f_type = F_UNUSED; 1982 logerror(p); 1983 break; 1984 } 1985 if (syncfile) 1986 f->f_flags |= FFLAG_SYNC; 1987 if (isatty(f->f_file)) { 1988 if (strcmp(p, ctty) == 0) 1989 f->f_type = F_CONSOLE; 1990 else 1991 f->f_type = F_TTY; 1992 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1993 sizeof(f->f_un.f_fname)); 1994 } else { 1995 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1996 f->f_type = F_FILE; 1997 } 1998 break; 1999 2000 case '|': 2001 f->f_un.f_pipe.f_pid = 0; 2002 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2003 sizeof(f->f_un.f_pipe.f_pname)); 2004 f->f_type = F_PIPE; 2005 break; 2006 2007 case '*': 2008 f->f_type = F_WALL; 2009 break; 2010 2011 default: 2012 for (i = 0; i < MAXUNAMES && *p; i++) { 2013 for (q = p; *q && *q != ','; ) 2014 q++; 2015 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2016 if ((q - p) >= MAXLOGNAME) 2017 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2018 else 2019 f->f_un.f_uname[i][q - p] = '\0'; 2020 while (*q == ',' || *q == ' ') 2021 q++; 2022 p = q; 2023 } 2024 f->f_type = F_USERS; 2025 break; 2026 } 2027 } 2028 2029 2030 /* 2031 * Decode a symbolic name to a numeric value 2032 */ 2033 static int 2034 decode(const char *name, const CODE *codetab) 2035 { 2036 const CODE *c; 2037 char *p, buf[40]; 2038 2039 if (isdigit(*name)) 2040 return (atoi(name)); 2041 2042 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2043 if (isupper(*name)) 2044 *p = tolower(*name); 2045 else 2046 *p = *name; 2047 } 2048 *p = '\0'; 2049 for (c = codetab; c->c_name; c++) 2050 if (!strcmp(buf, c->c_name)) 2051 return (c->c_val); 2052 2053 return (-1); 2054 } 2055 2056 static void 2057 markit(void) 2058 { 2059 struct filed *f; 2060 dq_t q, next; 2061 2062 now = time((time_t *)NULL); 2063 MarkSeq += TIMERINTVL; 2064 if (MarkSeq >= MarkInterval) { 2065 logmsg(LOG_INFO, "-- MARK --", 2066 LocalHostName, ADDDATE|MARK); 2067 MarkSeq = 0; 2068 } 2069 2070 for (f = Files; f; f = f->f_next) { 2071 if (f->f_prevcount && now >= REPEATTIME(f)) { 2072 dprintf("flush %s: repeated %d times, %d sec.\n", 2073 TypeNames[f->f_type], f->f_prevcount, 2074 repeatinterval[f->f_repeatcount]); 2075 fprintlog(f, 0, (char *)NULL); 2076 BACKOFF(f); 2077 } 2078 } 2079 2080 /* Walk the dead queue, and see if we should signal somebody. */ 2081 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2082 next = TAILQ_NEXT(q, dq_entries); 2083 2084 switch (q->dq_timeout) { 2085 case 0: 2086 /* Already signalled once, try harder now. */ 2087 if (kill(q->dq_pid, SIGKILL) != 0) 2088 (void)deadq_remove(q->dq_pid); 2089 break; 2090 2091 case 1: 2092 /* 2093 * Timed out on dead queue, send terminate 2094 * signal. Note that we leave the removal 2095 * from the dead queue to reapchild(), which 2096 * will also log the event (unless the process 2097 * didn't even really exist, in case we simply 2098 * drop it from the dead queue). 2099 */ 2100 if (kill(q->dq_pid, SIGTERM) != 0) 2101 (void)deadq_remove(q->dq_pid); 2102 /* FALLTHROUGH */ 2103 2104 default: 2105 q->dq_timeout--; 2106 } 2107 } 2108 MarkSet = 0; 2109 (void)alarm(TIMERINTVL); 2110 } 2111 2112 /* 2113 * fork off and become a daemon, but wait for the child to come online 2114 * before returing to the parent, or we get disk thrashing at boot etc. 2115 * Set a timer so we don't hang forever if it wedges. 2116 */ 2117 static int 2118 waitdaemon(int nochdir, int noclose, int maxwait) 2119 { 2120 int fd; 2121 int status; 2122 pid_t pid, childpid; 2123 2124 switch (childpid = fork()) { 2125 case -1: 2126 return (-1); 2127 case 0: 2128 break; 2129 default: 2130 signal(SIGALRM, timedout); 2131 alarm(maxwait); 2132 while ((pid = wait3(&status, 0, NULL)) != -1) { 2133 if (WIFEXITED(status)) 2134 errx(1, "child pid %d exited with return code %d", 2135 pid, WEXITSTATUS(status)); 2136 if (WIFSIGNALED(status)) 2137 errx(1, "child pid %d exited on signal %d%s", 2138 pid, WTERMSIG(status), 2139 WCOREDUMP(status) ? " (core dumped)" : 2140 ""); 2141 if (pid == childpid) /* it's gone... */ 2142 break; 2143 } 2144 exit(0); 2145 } 2146 2147 if (setsid() == -1) 2148 return (-1); 2149 2150 if (!nochdir) 2151 (void)chdir("/"); 2152 2153 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2154 (void)dup2(fd, STDIN_FILENO); 2155 (void)dup2(fd, STDOUT_FILENO); 2156 (void)dup2(fd, STDERR_FILENO); 2157 if (fd > 2) 2158 (void)close (fd); 2159 } 2160 return (getppid()); 2161 } 2162 2163 /* 2164 * We get a SIGALRM from the child when it's running and finished doing it's 2165 * fsync()'s or O_SYNC writes for all the boot messages. 2166 * 2167 * We also get a signal from the kernel if the timer expires, so check to 2168 * see what happened. 2169 */ 2170 static void 2171 timedout(int sig __unused) 2172 { 2173 int left; 2174 left = alarm(0); 2175 signal(SIGALRM, SIG_DFL); 2176 if (left == 0) 2177 errx(1, "timed out waiting for child"); 2178 else 2179 _exit(0); 2180 } 2181 2182 /* 2183 * Add `s' to the list of allowable peer addresses to accept messages 2184 * from. 2185 * 2186 * `s' is a string in the form: 2187 * 2188 * [*]domainname[:{servicename|portnumber|*}] 2189 * 2190 * or 2191 * 2192 * netaddr/maskbits[:{servicename|portnumber|*}] 2193 * 2194 * Returns -1 on error, 0 if the argument was valid. 2195 */ 2196 static int 2197 allowaddr(char *s) 2198 { 2199 char *cp1, *cp2; 2200 struct allowedpeer ap; 2201 struct servent *se; 2202 int masklen = -1; 2203 struct addrinfo hints, *res; 2204 struct in_addr *addrp, *maskp; 2205 #ifdef INET6 2206 int i; 2207 u_int32_t *addr6p, *mask6p; 2208 #endif 2209 char ip[NI_MAXHOST]; 2210 2211 #ifdef INET6 2212 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2213 #endif 2214 cp1 = s; 2215 if ((cp1 = strrchr(cp1, ':'))) { 2216 /* service/port provided */ 2217 *cp1++ = '\0'; 2218 if (strlen(cp1) == 1 && *cp1 == '*') 2219 /* any port allowed */ 2220 ap.port = 0; 2221 else if ((se = getservbyname(cp1, "udp"))) { 2222 ap.port = ntohs(se->s_port); 2223 } else { 2224 ap.port = strtol(cp1, &cp2, 0); 2225 if (*cp2 != '\0') 2226 return (-1); /* port not numeric */ 2227 } 2228 } else { 2229 if ((se = getservbyname("syslog", "udp"))) 2230 ap.port = ntohs(se->s_port); 2231 else 2232 /* sanity, should not happen */ 2233 ap.port = 514; 2234 } 2235 2236 if ((cp1 = strchr(s, '/')) != NULL && 2237 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2238 *cp1 = '\0'; 2239 if ((masklen = atoi(cp1 + 1)) < 0) 2240 return (-1); 2241 } 2242 #ifdef INET6 2243 if (*s == '[') { 2244 cp2 = s + strlen(s) - 1; 2245 if (*cp2 == ']') { 2246 ++s; 2247 *cp2 = '\0'; 2248 } else { 2249 cp2 = NULL; 2250 } 2251 } else { 2252 cp2 = NULL; 2253 } 2254 #endif 2255 memset(&hints, 0, sizeof(hints)); 2256 hints.ai_family = PF_UNSPEC; 2257 hints.ai_socktype = SOCK_DGRAM; 2258 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2259 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2260 ap.isnumeric = 1; 2261 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2262 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2263 ap.a_mask.ss_family = res->ai_family; 2264 if (res->ai_family == AF_INET) { 2265 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2266 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2267 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2268 if (masklen < 0) { 2269 /* use default netmask */ 2270 if (IN_CLASSA(ntohl(addrp->s_addr))) 2271 maskp->s_addr = htonl(IN_CLASSA_NET); 2272 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2273 maskp->s_addr = htonl(IN_CLASSB_NET); 2274 else 2275 maskp->s_addr = htonl(IN_CLASSC_NET); 2276 } else if (masklen <= 32) { 2277 /* convert masklen to netmask */ 2278 if (masklen == 0) 2279 maskp->s_addr = 0; 2280 else 2281 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2282 } else { 2283 freeaddrinfo(res); 2284 return (-1); 2285 } 2286 /* Lose any host bits in the network number. */ 2287 addrp->s_addr &= maskp->s_addr; 2288 } 2289 #ifdef INET6 2290 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2291 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2292 if (masklen < 0) 2293 masklen = 128; 2294 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2295 /* convert masklen to netmask */ 2296 while (masklen > 0) { 2297 if (masklen < 32) { 2298 *mask6p = htonl(~(0xffffffff >> masklen)); 2299 break; 2300 } 2301 *mask6p++ = 0xffffffff; 2302 masklen -= 32; 2303 } 2304 /* Lose any host bits in the network number. */ 2305 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2306 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2307 for (i = 0; i < 4; i++) 2308 addr6p[i] &= mask6p[i]; 2309 } 2310 #endif 2311 else { 2312 freeaddrinfo(res); 2313 return (-1); 2314 } 2315 freeaddrinfo(res); 2316 } else { 2317 /* arg `s' is domain name */ 2318 ap.isnumeric = 0; 2319 ap.a_name = s; 2320 if (cp1) 2321 *cp1 = '/'; 2322 #ifdef INET6 2323 if (cp2) { 2324 *cp2 = ']'; 2325 --s; 2326 } 2327 #endif 2328 } 2329 2330 if (Debug) { 2331 printf("allowaddr: rule %d: ", NumAllowed); 2332 if (ap.isnumeric) { 2333 printf("numeric, "); 2334 getnameinfo((struct sockaddr *)&ap.a_addr, 2335 ((struct sockaddr *)&ap.a_addr)->sa_len, 2336 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2337 printf("addr = %s, ", ip); 2338 getnameinfo((struct sockaddr *)&ap.a_mask, 2339 ((struct sockaddr *)&ap.a_mask)->sa_len, 2340 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2341 printf("mask = %s; ", ip); 2342 } else { 2343 printf("domainname = %s; ", ap.a_name); 2344 } 2345 printf("port = %d\n", ap.port); 2346 } 2347 2348 if ((AllowedPeers = realloc(AllowedPeers, 2349 ++NumAllowed * sizeof(struct allowedpeer))) 2350 == NULL) { 2351 logerror("realloc"); 2352 exit(1); 2353 } 2354 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2355 return (0); 2356 } 2357 2358 /* 2359 * Validate that the remote peer has permission to log to us. 2360 */ 2361 static int 2362 validate(struct sockaddr *sa, const char *hname) 2363 { 2364 int i; 2365 size_t l1, l2; 2366 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2367 struct allowedpeer *ap; 2368 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2369 #ifdef INET6 2370 int j, reject; 2371 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2372 #endif 2373 struct addrinfo hints, *res; 2374 u_short sport; 2375 2376 if (NumAllowed == 0) 2377 /* traditional behaviour, allow everything */ 2378 return (1); 2379 2380 (void)strlcpy(name, hname, sizeof(name)); 2381 memset(&hints, 0, sizeof(hints)); 2382 hints.ai_family = PF_UNSPEC; 2383 hints.ai_socktype = SOCK_DGRAM; 2384 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2385 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2386 freeaddrinfo(res); 2387 else if (strchr(name, '.') == NULL) { 2388 strlcat(name, ".", sizeof name); 2389 strlcat(name, LocalDomain, sizeof name); 2390 } 2391 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2392 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2393 return (0); /* for safety, should not occur */ 2394 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2395 ip, port, name); 2396 sport = atoi(port); 2397 2398 /* now, walk down the list */ 2399 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2400 if (ap->port != 0 && ap->port != sport) { 2401 dprintf("rejected in rule %d due to port mismatch.\n", i); 2402 continue; 2403 } 2404 2405 if (ap->isnumeric) { 2406 if (ap->a_addr.ss_family != sa->sa_family) { 2407 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2408 continue; 2409 } 2410 if (ap->a_addr.ss_family == AF_INET) { 2411 sin4 = (struct sockaddr_in *)sa; 2412 a4p = (struct sockaddr_in *)&ap->a_addr; 2413 m4p = (struct sockaddr_in *)&ap->a_mask; 2414 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2415 != a4p->sin_addr.s_addr) { 2416 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2417 continue; 2418 } 2419 } 2420 #ifdef INET6 2421 else if (ap->a_addr.ss_family == AF_INET6) { 2422 sin6 = (struct sockaddr_in6 *)sa; 2423 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2424 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2425 if (a6p->sin6_scope_id != 0 && 2426 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2427 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2428 continue; 2429 } 2430 reject = 0; 2431 for (j = 0; j < 16; j += 4) { 2432 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2433 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2434 ++reject; 2435 break; 2436 } 2437 } 2438 if (reject) { 2439 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2440 continue; 2441 } 2442 } 2443 #endif 2444 else 2445 continue; 2446 } else { 2447 cp = ap->a_name; 2448 l1 = strlen(name); 2449 if (*cp == '*') { 2450 /* allow wildmatch */ 2451 cp++; 2452 l2 = strlen(cp); 2453 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2454 dprintf("rejected in rule %d due to name mismatch.\n", i); 2455 continue; 2456 } 2457 } else { 2458 /* exact match */ 2459 l2 = strlen(cp); 2460 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2461 dprintf("rejected in rule %d due to name mismatch.\n", i); 2462 continue; 2463 } 2464 } 2465 } 2466 dprintf("accepted in rule %d.\n", i); 2467 return (1); /* hooray! */ 2468 } 2469 return (0); 2470 } 2471 2472 /* 2473 * Fairly similar to popen(3), but returns an open descriptor, as 2474 * opposed to a FILE *. 2475 */ 2476 static int 2477 p_open(const char *prog, pid_t *rpid) 2478 { 2479 int pfd[2], nulldesc; 2480 pid_t pid; 2481 sigset_t omask, mask; 2482 char *argv[4]; /* sh -c cmd NULL */ 2483 char errmsg[200]; 2484 2485 if (pipe(pfd) == -1) 2486 return (-1); 2487 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2488 /* we are royally screwed anyway */ 2489 return (-1); 2490 2491 sigemptyset(&mask); 2492 sigaddset(&mask, SIGALRM); 2493 sigaddset(&mask, SIGHUP); 2494 sigprocmask(SIG_BLOCK, &mask, &omask); 2495 switch ((pid = fork())) { 2496 case -1: 2497 sigprocmask(SIG_SETMASK, &omask, 0); 2498 close(nulldesc); 2499 return (-1); 2500 2501 case 0: 2502 argv[0] = strdup("sh"); 2503 argv[1] = strdup("-c"); 2504 argv[2] = strdup(prog); 2505 argv[3] = NULL; 2506 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2507 logerror("strdup"); 2508 exit(1); 2509 } 2510 2511 alarm(0); 2512 (void)setsid(); /* Avoid catching SIGHUPs. */ 2513 2514 /* 2515 * Throw away pending signals, and reset signal 2516 * behaviour to standard values. 2517 */ 2518 signal(SIGALRM, SIG_IGN); 2519 signal(SIGHUP, SIG_IGN); 2520 sigprocmask(SIG_SETMASK, &omask, 0); 2521 signal(SIGPIPE, SIG_DFL); 2522 signal(SIGQUIT, SIG_DFL); 2523 signal(SIGALRM, SIG_DFL); 2524 signal(SIGHUP, SIG_DFL); 2525 2526 dup2(pfd[0], STDIN_FILENO); 2527 dup2(nulldesc, STDOUT_FILENO); 2528 dup2(nulldesc, STDERR_FILENO); 2529 closefrom(3); 2530 2531 (void)execvp(_PATH_BSHELL, argv); 2532 _exit(255); 2533 } 2534 2535 sigprocmask(SIG_SETMASK, &omask, 0); 2536 close(nulldesc); 2537 close(pfd[0]); 2538 /* 2539 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2540 * supposed to get an EWOULDBLOCK on writev(2), which is 2541 * caught by the logic above anyway, which will in turn close 2542 * the pipe, and fork a new logging subprocess if necessary. 2543 * The stale subprocess will be killed some time later unless 2544 * it terminated itself due to closing its input pipe (so we 2545 * get rid of really dead puppies). 2546 */ 2547 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2548 /* This is bad. */ 2549 (void)snprintf(errmsg, sizeof errmsg, 2550 "Warning: cannot change pipe to PID %d to " 2551 "non-blocking behaviour.", 2552 (int)pid); 2553 logerror(errmsg); 2554 } 2555 *rpid = pid; 2556 return (pfd[1]); 2557 } 2558 2559 static void 2560 deadq_enter(pid_t pid, const char *name) 2561 { 2562 dq_t p; 2563 int status; 2564 2565 /* 2566 * Be paranoid, if we can't signal the process, don't enter it 2567 * into the dead queue (perhaps it's already dead). If possible, 2568 * we try to fetch and log the child's status. 2569 */ 2570 if (kill(pid, 0) != 0) { 2571 if (waitpid(pid, &status, WNOHANG) > 0) 2572 log_deadchild(pid, status, name); 2573 return; 2574 } 2575 2576 p = malloc(sizeof(struct deadq_entry)); 2577 if (p == NULL) { 2578 logerror("malloc"); 2579 exit(1); 2580 } 2581 2582 p->dq_pid = pid; 2583 p->dq_timeout = DQ_TIMO_INIT; 2584 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2585 } 2586 2587 static int 2588 deadq_remove(pid_t pid) 2589 { 2590 dq_t q; 2591 2592 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2593 if (q->dq_pid == pid) { 2594 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2595 free(q); 2596 return (1); 2597 } 2598 } 2599 2600 return (0); 2601 } 2602 2603 static void 2604 log_deadchild(pid_t pid, int status, const char *name) 2605 { 2606 int code; 2607 char buf[256]; 2608 const char *reason; 2609 2610 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2611 if (WIFSIGNALED(status)) { 2612 reason = "due to signal"; 2613 code = WTERMSIG(status); 2614 } else { 2615 reason = "with status"; 2616 code = WEXITSTATUS(status); 2617 if (code == 0) 2618 return; 2619 } 2620 (void)snprintf(buf, sizeof buf, 2621 "Logging subprocess %d (%s) exited %s %d.", 2622 pid, name, reason, code); 2623 logerror(buf); 2624 } 2625 2626 static int * 2627 socksetup(int af, char *bindhostname) 2628 { 2629 struct addrinfo hints, *res, *r; 2630 const char *bindservice; 2631 char *cp; 2632 int error, maxs, *s, *socks; 2633 2634 /* 2635 * We have to handle this case for backwards compatibility: 2636 * If there are two (or more) colons but no '[' and ']', 2637 * assume this is an inet6 address without a service. 2638 */ 2639 bindservice = "syslog"; 2640 if (bindhostname != NULL) { 2641 #ifdef INET6 2642 if (*bindhostname == '[' && 2643 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2644 ++bindhostname; 2645 *cp = '\0'; 2646 if (cp[1] == ':' && cp[2] != '\0') 2647 bindservice = cp + 2; 2648 } else { 2649 #endif 2650 cp = strchr(bindhostname, ':'); 2651 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2652 *cp = '\0'; 2653 if (cp[1] != '\0') 2654 bindservice = cp + 1; 2655 if (cp == bindhostname) 2656 bindhostname = NULL; 2657 } 2658 #ifdef INET6 2659 } 2660 #endif 2661 } 2662 2663 memset(&hints, 0, sizeof(hints)); 2664 hints.ai_flags = AI_PASSIVE; 2665 hints.ai_family = af; 2666 hints.ai_socktype = SOCK_DGRAM; 2667 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2668 if (error) { 2669 logerror(gai_strerror(error)); 2670 errno = 0; 2671 die(0); 2672 } 2673 2674 /* Count max number of sockets we may open */ 2675 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2676 socks = malloc((maxs+1) * sizeof(int)); 2677 if (socks == NULL) { 2678 logerror("couldn't allocate memory for sockets"); 2679 die(0); 2680 } 2681 2682 *socks = 0; /* num of sockets counter at start of array */ 2683 s = socks + 1; 2684 for (r = res; r; r = r->ai_next) { 2685 int on = 1; 2686 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2687 if (*s < 0) { 2688 logerror("socket"); 2689 continue; 2690 } 2691 #ifdef INET6 2692 if (r->ai_family == AF_INET6) { 2693 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2694 (char *)&on, sizeof (on)) < 0) { 2695 logerror("setsockopt"); 2696 close(*s); 2697 continue; 2698 } 2699 } 2700 #endif 2701 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2702 (char *)&on, sizeof (on)) < 0) { 2703 logerror("setsockopt"); 2704 close(*s); 2705 continue; 2706 } 2707 /* 2708 * RFC 3164 recommends that client side message 2709 * should come from the privileged syslogd port. 2710 * 2711 * If the system administrator choose not to obey 2712 * this, we can skip the bind() step so that the 2713 * system will choose a port for us. 2714 */ 2715 if (!NoBind) { 2716 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2717 logerror("bind"); 2718 close(*s); 2719 continue; 2720 } 2721 2722 if (!SecureMode) 2723 double_rbuf(*s); 2724 } 2725 2726 (*socks)++; 2727 s++; 2728 } 2729 2730 if (*socks == 0) { 2731 free(socks); 2732 if (Debug) 2733 return (NULL); 2734 else 2735 die(0); 2736 } 2737 if (res) 2738 freeaddrinfo(res); 2739 2740 return (socks); 2741 } 2742 2743 static void 2744 double_rbuf(int fd) 2745 { 2746 socklen_t slen, len; 2747 2748 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2749 len *= 2; 2750 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); 2751 } 2752 } 2753