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. 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 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94 30 * $FreeBSD: head/usr.sbin/syslogd/syslogd.c 258077 2013-11-13 01:04:02Z ian $ 31 */ 32 33 /* 34 * syslogd -- log system messages 35 * 36 * This program implements a system log. It takes a series of lines. 37 * Each line may have a priority, signified as "<n>" as 38 * the first characters of the line. If this is 39 * not present, a default priority is used. 40 * 41 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 42 * cause it to reread its configuration file. 43 * 44 * Defined Constants: 45 * 46 * MAXLINE -- the maximum line length that can be handled. 47 * DEFUPRI -- the default priority for user messages 48 * DEFSPRI -- the default priority for kernel messages 49 * 50 * Author: Eric Allman 51 * extensive changes by Ralph Campbell 52 * more extensive changes by Eric Allman (again) 53 * Extension to log by program name as well as facility and priority 54 * by Peter da Silva. 55 * -u and -v by Harlan Stenn. 56 * Priority comparison code by Harlan Stenn. 57 */ 58 59 #define MAXLINE 1024 /* maximum line length */ 60 #define MAXSVLINE 120 /* maximum saved line length */ 61 #define DEFUPRI (LOG_USER|LOG_NOTICE) 62 #define DEFSPRI (LOG_KERN|LOG_CRIT) 63 #define TIMERINTVL 30 /* interval for checking flush, mark */ 64 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 65 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 66 67 #include <sys/param.h> 68 #include <sys/ioctl.h> 69 #include <sys/mman.h> 70 #include <sys/stat.h> 71 #include <sys/wait.h> 72 #include <sys/socket.h> 73 #include <sys/queue.h> 74 #include <sys/uio.h> 75 #include <sys/un.h> 76 #include <sys/time.h> 77 #include <sys/resource.h> 78 #include <sys/syslimits.h> 79 #include <sys/types.h> 80 81 #include <netinet/in.h> 82 #include <netdb.h> 83 #include <arpa/inet.h> 84 85 #include <ctype.h> 86 #include <err.h> 87 #include <errno.h> 88 #include <fcntl.h> 89 #include <libutil.h> 90 #include <limits.h> 91 #include <paths.h> 92 #include <signal.h> 93 #include <stdio.h> 94 #include <stdlib.h> 95 #include <string.h> 96 #include <sysexits.h> 97 #include <unistd.h> 98 #include <utmpx.h> 99 100 #include "pathnames.h" 101 #include "ttymsg.h" 102 103 #define SYSLOG_NAMES 104 #include <sys/syslog.h> 105 106 const char *ConfFile = _PATH_LOGCONF; 107 const char *PidFile = _PATH_LOGPID; 108 const char ctty[] = _PATH_CONSOLE; 109 110 #define dprintf if (Debug) printf 111 112 #define MAXUNAMES 20 /* maximum number of user names */ 113 114 /* 115 * Unix sockets. 116 * We have two default sockets, one with 666 permissions, 117 * and one for privileged programs. 118 */ 119 struct funix { 120 int s; 121 const char *name; 122 mode_t mode; 123 STAILQ_ENTRY(funix) next; 124 }; 125 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 126 { NULL } }; 127 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 128 { &funix_secure } }; 129 130 STAILQ_HEAD(, funix) funixes = { &funix_default, 131 &(funix_secure.next.stqe_next) }; 132 133 /* 134 * Flags to logmsg(). 135 */ 136 137 #define IGN_CONS 0x001 /* don't print on console */ 138 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 139 #define ADDDATE 0x004 /* add a date to the message */ 140 #define MARK 0x008 /* this message is a mark */ 141 #define ISKERNEL 0x010 /* kernel generated message */ 142 143 /* 144 * This structure represents the files that will have log 145 * copies printed. 146 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 147 * or if f_type if F_PIPE and f_pid > 0. 148 */ 149 150 struct filed { 151 struct filed *f_next; /* next in linked list */ 152 short f_type; /* entry type, see below */ 153 short f_file; /* file descriptor */ 154 time_t f_time; /* time this was last written */ 155 char *f_host; /* host from which to recd. */ 156 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 157 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 158 #define PRI_LT 0x1 159 #define PRI_EQ 0x2 160 #define PRI_GT 0x4 161 char *f_program; /* program this applies to */ 162 union { 163 char f_uname[MAXUNAMES][MAXLOGNAME]; 164 struct { 165 char f_hname[MAXHOSTNAMELEN]; 166 struct addrinfo *f_addr; 167 168 } f_forw; /* forwarding address */ 169 char f_fname[MAXPATHLEN]; 170 struct { 171 char f_pname[MAXPATHLEN]; 172 pid_t f_pid; 173 } f_pipe; 174 } f_un; 175 char f_prevline[MAXSVLINE]; /* last message logged */ 176 char f_lasttime[16]; /* time of last occurrence */ 177 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 178 int f_prevpri; /* pri of f_prevline */ 179 int f_prevlen; /* length of f_prevline */ 180 int f_prevcount; /* repetition cnt of prevline */ 181 u_int f_repeatcount; /* number of "repeated" msgs */ 182 int f_flags; /* file-specific flags */ 183 #define FFLAG_SYNC 0x01 184 #define FFLAG_NEEDSYNC 0x02 185 }; 186 187 /* 188 * Queue of about-to-be dead processes we should watch out for. 189 */ 190 191 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 192 struct stailhead *deadq_headp; 193 194 struct deadq_entry { 195 pid_t dq_pid; 196 int dq_timeout; 197 TAILQ_ENTRY(deadq_entry) dq_entries; 198 }; 199 200 /* 201 * The timeout to apply to processes waiting on the dead queue. Unit 202 * of measure is `mark intervals', i.e. 20 minutes by default. 203 * Processes on the dead queue will be terminated after that time. 204 */ 205 206 #define DQ_TIMO_INIT 2 207 208 typedef struct deadq_entry *dq_t; 209 210 211 /* 212 * Struct to hold records of network addresses that are allowed to log 213 * to us. 214 */ 215 struct allowedpeer { 216 int isnumeric; 217 u_short port; 218 union { 219 struct { 220 struct sockaddr_storage addr; 221 struct sockaddr_storage mask; 222 } numeric; 223 char *name; 224 } u; 225 #define a_addr u.numeric.addr 226 #define a_mask u.numeric.mask 227 #define a_name u.name 228 }; 229 230 231 /* 232 * Intervals at which we flush out "message repeated" messages, 233 * in seconds after previous message is logged. After each flush, 234 * we move to the next interval until we reach the largest. 235 */ 236 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 237 #define MAXREPEAT (NELEM(repeatinterval) - 1) 238 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 239 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 240 (f)->f_repeatcount = MAXREPEAT; \ 241 } 242 243 /* values for f_type */ 244 #define F_UNUSED 0 /* unused entry */ 245 #define F_FILE 1 /* regular file */ 246 #define F_TTY 2 /* terminal */ 247 #define F_CONSOLE 3 /* console terminal */ 248 #define F_FORW 4 /* remote machine */ 249 #define F_USERS 5 /* list of users */ 250 #define F_WALL 6 /* everyone logged on */ 251 #define F_PIPE 7 /* pipe to program */ 252 253 const char *TypeNames[8] = { 254 "UNUSED", "FILE", "TTY", "CONSOLE", 255 "FORW", "USERS", "WALL", "PIPE" 256 }; 257 258 static struct filed *Files; /* Log files that we write to */ 259 static struct filed consfile; /* Console */ 260 261 static int Debug; /* debug flag */ 262 static int resolve = 1; /* resolve hostname */ 263 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 264 static const char *LocalDomain; /* our local domain name */ 265 static int *finet; /* Internet datagram socket */ 266 static int fklog = -1; /* /dev/klog */ 267 static int Initialized; /* set when we have initialized ourselves */ 268 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 269 static int MarkSeq; /* mark sequence number */ 270 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 271 static int SecureMode; /* when true, receive only unix domain socks */ 272 #ifdef INET6 273 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 274 #else 275 static int family = PF_INET; /* protocol family (IPv4 only) */ 276 #endif 277 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 278 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 279 static int use_bootfile; /* log entire bootfile for every kern msg */ 280 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 281 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 282 283 static char bootfile[MAXLINE+1]; /* booted kernel file */ 284 285 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 286 static int NumAllowed; /* Number of entries in AllowedPeers */ 287 static int RemoteAddDate; /* Always set the date on remote messages */ 288 289 static int UniquePriority; /* Only log specified priority? */ 290 static int LogFacPri; /* Put facility and priority in log message: */ 291 /* 0=no, 1=numeric, 2=names */ 292 static int KeepKernFac; /* Keep remotely logged kernel facility */ 293 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 294 static struct pidfh *pfh; 295 296 volatile sig_atomic_t MarkSet, WantDie; 297 298 static int allowaddr(char *); 299 static void cfline(const char *, struct filed *, 300 const char *, const char *); 301 static const char *cvthname(struct sockaddr *); 302 static void deadq_enter(pid_t, const char *); 303 static int deadq_remove(pid_t); 304 static int decode(const char *, const CODE *); 305 static void die(int); 306 static void dodie(int); 307 static void dofsync(void); 308 static void domark(int); 309 static void fprintlog(struct filed *, int, const char *); 310 static int *socksetup(int, char *); 311 static void init(int); 312 static void logerror(const char *); 313 static void logmsg(int, const char *, const char *, int); 314 static void log_deadchild(pid_t, int, const char *); 315 static void markit(void); 316 static int skip_message(const char *, const char *, int); 317 static void printline(const char *, char *, int); 318 static void printsys(char *); 319 static int p_open(const char *, pid_t *); 320 static void readklog(void); 321 static void reapchild(int); 322 static void usage(void); 323 static int validate(struct sockaddr *, const char *); 324 static void unmapped(struct sockaddr *); 325 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 326 static int waitdaemon(int, int, int); 327 static void timedout(int); 328 static void increase_rcvbuf(int); 329 330 int 331 main(int argc, char *argv[]) 332 { 333 int ch, i, fdsrmax = 0, l; 334 struct sockaddr_un sunx, fromunix; 335 struct sockaddr_storage frominet; 336 fd_set *fdsr = NULL; 337 char line[MAXLINE + 1]; 338 char *bindhostname; 339 const char *hname; 340 struct timeval tv, *tvp; 341 struct sigaction sact; 342 struct funix *fx, *fx1; 343 sigset_t mask; 344 pid_t ppid = 1, spid; 345 socklen_t len; 346 347 bindhostname = NULL; 348 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 349 != -1) 350 switch (ch) { 351 case '4': 352 family = PF_INET; 353 break; 354 #ifdef INET6 355 case '6': 356 family = PF_INET6; 357 break; 358 #endif 359 case '8': 360 mask_C1 = 0; 361 break; 362 case 'A': 363 send_to_all++; 364 break; 365 case 'a': /* allow specific network addresses only */ 366 if (allowaddr(optarg) == -1) 367 usage(); 368 break; 369 case 'b': 370 bindhostname = optarg; 371 break; 372 case 'c': 373 no_compress++; 374 break; 375 case 'C': 376 logflags |= O_CREAT; 377 break; 378 case 'd': /* debug */ 379 Debug++; 380 break; 381 case 'f': /* configuration file */ 382 ConfFile = optarg; 383 break; 384 case 'k': /* keep remote kern fac */ 385 KeepKernFac = 1; 386 break; 387 case 'l': 388 { 389 long perml; 390 mode_t mode; 391 char *name, *ep; 392 393 if (optarg[0] == '/') { 394 mode = DEFFILEMODE; 395 name = optarg; 396 } else if ((name = strchr(optarg, ':')) != NULL) { 397 *name++ = '\0'; 398 if (name[0] != '/') 399 errx(1, "socket name must be absolute " 400 "path"); 401 if (isdigit(*optarg)) { 402 perml = strtol(optarg, &ep, 8); 403 if (*ep || perml < 0 || 404 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 405 errx(1, "invalid mode %s, exiting", 406 optarg); 407 mode = (mode_t )perml; 408 } else 409 errx(1, "invalid mode %s, exiting", 410 optarg); 411 } else /* doesn't begin with '/', and no ':' */ 412 errx(1, "can't parse path %s", optarg); 413 414 if (strlen(name) >= sizeof(sunx.sun_path)) 415 errx(1, "%s path too long, exiting", name); 416 if ((fx = malloc(sizeof(struct funix))) == NULL) 417 errx(1, "malloc failed"); 418 fx->s = -1; 419 fx->name = name; 420 fx->mode = mode; 421 STAILQ_INSERT_TAIL(&funixes, fx, next); 422 break; 423 } 424 case 'm': /* mark interval */ 425 MarkInterval = atoi(optarg) * 60; 426 break; 427 case 'N': 428 NoBind = 1; 429 SecureMode = 1; 430 break; 431 case 'n': 432 resolve = 0; 433 break; 434 case 'o': 435 use_bootfile = 1; 436 break; 437 case 'p': /* path */ 438 if (strlen(optarg) >= sizeof(sunx.sun_path)) 439 errx(1, "%s path too long, exiting", optarg); 440 funix_default.name = optarg; 441 break; 442 case 'P': /* path for alt. PID */ 443 PidFile = optarg; 444 break; 445 case 's': /* no network mode */ 446 SecureMode++; 447 break; 448 case 'S': /* path for privileged originator */ 449 if (strlen(optarg) >= sizeof(sunx.sun_path)) 450 errx(1, "%s path too long, exiting", optarg); 451 funix_secure.name = optarg; 452 break; 453 case 'T': 454 RemoteAddDate = 1; 455 break; 456 case 'u': /* only log specified priority */ 457 UniquePriority++; 458 break; 459 case 'v': /* log facility and priority */ 460 LogFacPri++; 461 break; 462 default: 463 usage(); 464 } 465 if ((argc -= optind) != 0) 466 usage(); 467 468 pfh = pidfile_open(PidFile, 0600, &spid); 469 if (pfh == NULL) { 470 if (errno == EEXIST) 471 errx(1, "syslogd already running, pid: %d", spid); 472 warn("cannot open pid file"); 473 } 474 475 if (!Debug) { 476 ppid = waitdaemon(0, 0, 30); 477 if (ppid < 0) { 478 warn("could not become daemon"); 479 pidfile_remove(pfh); 480 exit(1); 481 } 482 } else { 483 setlinebuf(stdout); 484 } 485 486 if (NumAllowed) 487 endservent(); 488 489 consfile.f_type = F_CONSOLE; 490 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 491 sizeof(consfile.f_un.f_fname)); 492 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 493 (void)signal(SIGTERM, dodie); 494 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 495 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 496 /* 497 * We don't want the SIGCHLD and SIGHUP handlers to interfere 498 * with each other; they are likely candidates for being called 499 * simultaneously (SIGHUP closes pipe descriptor, process dies, 500 * SIGCHLD happens). 501 */ 502 sigemptyset(&mask); 503 sigaddset(&mask, SIGHUP); 504 sact.sa_handler = reapchild; 505 sact.sa_mask = mask; 506 sact.sa_flags = SA_RESTART; 507 (void)sigaction(SIGCHLD, &sact, NULL); 508 (void)signal(SIGALRM, domark); 509 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 510 (void)alarm(TIMERINTVL); 511 512 TAILQ_INIT(&deadq_head); 513 514 #ifndef SUN_LEN 515 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 516 #endif 517 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) { 518 (void)unlink(fx->name); 519 memset(&sunx, 0, sizeof(sunx)); 520 sunx.sun_family = AF_LOCAL; 521 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 522 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 523 if (fx->s < 0 || 524 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 525 chmod(fx->name, fx->mode) < 0) { 526 (void)snprintf(line, sizeof line, 527 "cannot create %s", fx->name); 528 logerror(line); 529 dprintf("cannot create %s (%d)\n", fx->name, errno); 530 if (fx == &funix_default || fx == &funix_secure) 531 die(0); 532 else { 533 STAILQ_REMOVE(&funixes, fx, funix, next); 534 continue; 535 } 536 } 537 increase_rcvbuf(fx->s); 538 } 539 if (SecureMode <= 1) 540 finet = socksetup(family, bindhostname); 541 542 if (finet) { 543 if (SecureMode) { 544 for (i = 0; i < *finet; i++) { 545 if (shutdown(finet[i+1], SHUT_RD) < 0) { 546 logerror("shutdown"); 547 if (!Debug) 548 die(0); 549 } 550 } 551 } else { 552 dprintf("listening on inet and/or inet6 socket\n"); 553 } 554 dprintf("sending on inet and/or inet6 socket\n"); 555 } 556 557 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 558 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 559 fklog = -1; 560 if (fklog < 0) 561 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 562 563 /* tuck my process id away */ 564 pidfile_write(pfh); 565 566 dprintf("off & running....\n"); 567 568 init(0); 569 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 570 sigemptyset(&mask); 571 sigaddset(&mask, SIGCHLD); 572 sact.sa_handler = init; 573 sact.sa_mask = mask; 574 sact.sa_flags = SA_RESTART; 575 (void)sigaction(SIGHUP, &sact, NULL); 576 577 tvp = &tv; 578 tv.tv_sec = tv.tv_usec = 0; 579 580 if (fklog != -1 && fklog > fdsrmax) 581 fdsrmax = fklog; 582 if (finet && !SecureMode) { 583 for (i = 0; i < *finet; i++) { 584 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 585 fdsrmax = finet[i+1]; 586 } 587 } 588 STAILQ_FOREACH(fx, &funixes, next) 589 if (fx->s > fdsrmax) 590 fdsrmax = fx->s; 591 592 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 593 sizeof(fd_mask)); 594 if (fdsr == NULL) 595 errx(1, "calloc fd_set"); 596 597 for (;;) { 598 if (MarkSet) 599 markit(); 600 if (WantDie) 601 die(WantDie); 602 603 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 604 sizeof(fd_mask)); 605 606 if (fklog != -1) 607 FD_SET(fklog, fdsr); 608 if (finet && !SecureMode) { 609 for (i = 0; i < *finet; i++) { 610 if (finet[i+1] != -1) 611 FD_SET(finet[i+1], fdsr); 612 } 613 } 614 STAILQ_FOREACH(fx, &funixes, next) 615 FD_SET(fx->s, fdsr); 616 617 i = select(fdsrmax+1, fdsr, NULL, NULL, 618 needdofsync ? &tv : tvp); 619 switch (i) { 620 case 0: 621 dofsync(); 622 needdofsync = 0; 623 if (tvp) { 624 tvp = NULL; 625 if (ppid != 1) 626 kill(ppid, SIGALRM); 627 } 628 continue; 629 case -1: 630 if (errno != EINTR) 631 logerror("select"); 632 continue; 633 } 634 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 635 readklog(); 636 if (finet && !SecureMode) { 637 for (i = 0; i < *finet; i++) { 638 if (FD_ISSET(finet[i+1], fdsr)) { 639 len = sizeof(frominet); 640 l = recvfrom(finet[i+1], line, MAXLINE, 641 0, (struct sockaddr *)&frominet, 642 &len); 643 if (l > 0) { 644 line[l] = '\0'; 645 hname = cvthname((struct sockaddr *)&frominet); 646 unmapped((struct sockaddr *)&frominet); 647 if (validate((struct sockaddr *)&frominet, hname)) 648 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 649 } else if (l < 0 && errno != EINTR) 650 logerror("recvfrom inet"); 651 } 652 } 653 } 654 STAILQ_FOREACH(fx, &funixes, next) { 655 if (FD_ISSET(fx->s, fdsr)) { 656 len = sizeof(fromunix); 657 l = recvfrom(fx->s, line, MAXLINE, 0, 658 (struct sockaddr *)&fromunix, &len); 659 if (l > 0) { 660 line[l] = '\0'; 661 printline(LocalHostName, line, 0); 662 } else if (l < 0 && errno != EINTR) 663 logerror("recvfrom unix"); 664 } 665 } 666 } 667 if (fdsr) 668 free(fdsr); 669 } 670 671 static void 672 unmapped(struct sockaddr *sa) 673 { 674 struct sockaddr_in6 *sin6; 675 struct sockaddr_in sin4; 676 677 if (sa->sa_family != AF_INET6) 678 return; 679 if (sa->sa_len != sizeof(struct sockaddr_in6) || 680 sizeof(sin4) > sa->sa_len) 681 return; 682 sin6 = (struct sockaddr_in6 *)sa; 683 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 684 return; 685 686 memset(&sin4, 0, sizeof(sin4)); 687 sin4.sin_family = AF_INET; 688 sin4.sin_len = sizeof(struct sockaddr_in); 689 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 690 sizeof(sin4.sin_addr)); 691 sin4.sin_port = sin6->sin6_port; 692 693 memcpy(sa, &sin4, sin4.sin_len); 694 } 695 696 static void 697 usage(void) 698 { 699 700 fprintf(stderr, "%s\n%s\n%s\n%s\n", 701 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 702 " [-b bind_address] [-f config_file]", 703 " [-l [mode:]path] [-m mark_interval]", 704 " [-P pid_file] [-p log_socket]"); 705 exit(1); 706 } 707 708 /* 709 * Take a raw input line, decode the message, and print the message 710 * on the appropriate log files. 711 */ 712 static void 713 printline(const char *hname, char *msg, int flags) 714 { 715 char *p, *q; 716 long n; 717 int c, pri; 718 char line[MAXLINE + 1]; 719 720 /* test for special codes */ 721 p = msg; 722 pri = DEFUPRI; 723 if (*p == '<') { 724 errno = 0; 725 n = strtol(p + 1, &q, 10); 726 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 727 p = q + 1; 728 pri = n; 729 } 730 } 731 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 732 pri = DEFUPRI; 733 734 /* 735 * Don't allow users to log kernel messages. 736 * NOTE: since LOG_KERN == 0 this will also match 737 * messages with no facility specified. 738 */ 739 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 740 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 741 742 q = line; 743 744 while ((c = (unsigned char)*p++) != '\0' && 745 q < &line[sizeof(line) - 4]) { 746 if (mask_C1 && (c & 0x80) && c < 0xA0) { 747 c &= 0x7F; 748 *q++ = 'M'; 749 *q++ = '-'; 750 } 751 if (isascii(c) && iscntrl(c)) { 752 if (c == '\n') { 753 *q++ = ' '; 754 } else if (c == '\t') { 755 *q++ = '\t'; 756 } else { 757 *q++ = '^'; 758 *q++ = c ^ 0100; 759 } 760 } else { 761 *q++ = c; 762 } 763 } 764 *q = '\0'; 765 766 logmsg(pri, line, hname, flags); 767 } 768 769 /* 770 * Read /dev/klog while data are available, split into lines. 771 * 772 * Only dump whole lines, fixing potential write/read races that can 773 * cause lines to be split up due to the speed. 774 */ 775 static void 776 readklog(void) 777 { 778 static char line[MAXLINE + 1]; 779 static int len = 0; 780 char *p, *q; 781 int i; 782 783 for (;;) { 784 i = read(fklog, line + len, MAXLINE - 1 - len); 785 if (i > 0) { 786 line[i + len] = '\0'; 787 } else { 788 if (i < 0 && errno != EINTR && errno != EAGAIN) { 789 logerror("klog"); 790 fklog = -1; 791 } 792 break; 793 } 794 795 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 796 *q = '\0'; 797 printsys(p); 798 } 799 len = strlen(p); 800 if (len >= MAXLINE - 1) { 801 printsys(p); 802 len = 0; 803 } 804 if (len > 0) 805 memmove(line, p, len + 1); 806 } 807 } 808 809 /* 810 * Take a raw input line from /dev/klog, format similar to syslog(). 811 */ 812 static void 813 printsys(char *msg) 814 { 815 char *p, *q; 816 long n; 817 int flags, isprintf, pri; 818 819 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 820 p = msg; 821 pri = DEFSPRI; 822 isprintf = 1; 823 if (*p == '<') { 824 errno = 0; 825 n = strtol(p + 1, &q, 10); 826 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 827 p = q + 1; 828 pri = n; 829 isprintf = 0; 830 } 831 } 832 /* 833 * Kernel printf's and LOG_CONSOLE messages have been displayed 834 * on the console already. 835 */ 836 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 837 flags |= IGN_CONS; 838 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 839 pri = DEFSPRI; 840 logmsg(pri, p, LocalHostName, flags); 841 } 842 843 static time_t now; 844 845 /* 846 * Match a program or host name against a specification. 847 * Return a non-0 value if the message must be ignored 848 * based on the specification. 849 */ 850 static int 851 skip_message(const char *name, const char *spec, int checkcase) 852 { 853 const char *s; 854 char prev, next; 855 int exclude = 0; 856 /* Behaviour on explicit match */ 857 858 if (spec == NULL) 859 return 0; 860 switch (*spec) { 861 case '-': 862 exclude = 1; 863 /*FALLTHROUGH*/ 864 case '+': 865 spec++; 866 break; 867 default: 868 break; 869 } 870 if (checkcase) 871 s = strstr (spec, name); 872 else 873 s = strcasestr (spec, name); 874 875 if (s != NULL) { 876 prev = (s == spec ? ',' : *(s - 1)); 877 next = *(s + strlen (name)); 878 879 if (prev == ',' && (next == '\0' || next == ',')) 880 /* Explicit match: skip iff the spec is an 881 exclusive one. */ 882 return exclude; 883 } 884 885 /* No explicit match for this name: skip the message iff 886 the spec is an inclusive one. */ 887 return !exclude; 888 } 889 890 /* 891 * Log a message to the appropriate log files, users, etc. based on 892 * the priority. 893 */ 894 static void 895 logmsg(int pri, const char *msg, const char *from, int flags) 896 { 897 struct filed *f; 898 int i, fac, msglen, omask, prilev; 899 const char *timestamp; 900 char prog[NAME_MAX+1]; 901 char buf[MAXLINE+1]; 902 903 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 904 pri, flags, from, msg); 905 906 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 907 908 /* 909 * Check to see if msg looks non-standard. 910 */ 911 msglen = strlen(msg); 912 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 913 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 914 flags |= ADDDATE; 915 916 (void)time(&now); 917 if (flags & ADDDATE) { 918 timestamp = ctime(&now) + 4; 919 } else { 920 timestamp = msg; 921 msg += 16; 922 msglen -= 16; 923 } 924 925 /* skip leading blanks */ 926 while (isspace(*msg)) { 927 msg++; 928 msglen--; 929 } 930 931 /* extract facility and priority level */ 932 if (flags & MARK) 933 fac = LOG_NFACILITIES; 934 else 935 fac = LOG_FAC(pri); 936 937 /* Check maximum facility number. */ 938 if (fac > LOG_NFACILITIES) { 939 (void)sigsetmask(omask); 940 return; 941 } 942 943 prilev = LOG_PRI(pri); 944 945 /* extract program name */ 946 for (i = 0; i < NAME_MAX; i++) { 947 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 948 msg[i] == '/' || isspace(msg[i])) 949 break; 950 prog[i] = msg[i]; 951 } 952 prog[i] = 0; 953 954 /* add kernel prefix for kernel messages */ 955 if (flags & ISKERNEL) { 956 snprintf(buf, sizeof(buf), "%s: %s", 957 use_bootfile ? bootfile : "kernel", msg); 958 msg = buf; 959 msglen = strlen(buf); 960 } 961 962 /* log the message to the particular outputs */ 963 if (!Initialized) { 964 f = &consfile; 965 /* 966 * Open in non-blocking mode to avoid hangs during open 967 * and close(waiting for the port to drain). 968 */ 969 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 970 971 if (f->f_file >= 0) { 972 (void)strlcpy(f->f_lasttime, timestamp, 973 sizeof(f->f_lasttime)); 974 fprintlog(f, flags, msg); 975 (void)close(f->f_file); 976 } 977 (void)sigsetmask(omask); 978 return; 979 } 980 for (f = Files; f; f = f->f_next) { 981 /* skip messages that are incorrect priority */ 982 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 983 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 984 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 985 ) 986 || f->f_pmask[fac] == INTERNAL_NOPRI) 987 continue; 988 989 /* skip messages with the incorrect hostname */ 990 if (skip_message(from, f->f_host, 0)) 991 continue; 992 993 /* skip messages with the incorrect program name */ 994 if (skip_message(prog, f->f_program, 1)) 995 continue; 996 997 /* skip message to console if it has already been printed */ 998 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 999 continue; 1000 1001 /* don't output marks to recently written files */ 1002 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1003 continue; 1004 1005 /* 1006 * suppress duplicate lines to this file 1007 */ 1008 if (no_compress - (f->f_type != F_PIPE) < 1 && 1009 (flags & MARK) == 0 && msglen == f->f_prevlen && 1010 f->f_prevline && !strcmp(msg, f->f_prevline) && 1011 !strcasecmp(from, f->f_prevhost)) { 1012 (void)strlcpy(f->f_lasttime, timestamp, 1013 sizeof(f->f_lasttime)); 1014 f->f_prevcount++; 1015 dprintf("msg repeated %d times, %ld sec of %d\n", 1016 f->f_prevcount, (long)(now - f->f_time), 1017 repeatinterval[f->f_repeatcount]); 1018 /* 1019 * If domark would have logged this by now, 1020 * flush it now (so we don't hold isolated messages), 1021 * but back off so we'll flush less often 1022 * in the future. 1023 */ 1024 if (now > REPEATTIME(f)) { 1025 fprintlog(f, flags, NULL); 1026 BACKOFF(f); 1027 } 1028 } else { 1029 /* new line, save it */ 1030 if (f->f_prevcount) 1031 fprintlog(f, 0, NULL); 1032 f->f_repeatcount = 0; 1033 f->f_prevpri = pri; 1034 (void)strlcpy(f->f_lasttime, timestamp, 1035 sizeof(f->f_lasttime)); 1036 (void)strlcpy(f->f_prevhost, from, 1037 sizeof(f->f_prevhost)); 1038 if (msglen < MAXSVLINE) { 1039 f->f_prevlen = msglen; 1040 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1041 fprintlog(f, flags, NULL); 1042 } else { 1043 f->f_prevline[0] = 0; 1044 f->f_prevlen = 0; 1045 fprintlog(f, flags, msg); 1046 } 1047 } 1048 } 1049 (void)sigsetmask(omask); 1050 } 1051 1052 static void 1053 dofsync(void) 1054 { 1055 struct filed *f; 1056 1057 for (f = Files; f; f = f->f_next) { 1058 if ((f->f_type == F_FILE) && 1059 (f->f_flags & FFLAG_NEEDSYNC)) { 1060 f->f_flags &= ~FFLAG_NEEDSYNC; 1061 (void)fsync(f->f_file); 1062 } 1063 } 1064 } 1065 1066 #define IOV_SIZE 7 1067 static void 1068 fprintlog(struct filed *f, int flags, const char *msg) 1069 { 1070 struct iovec iov[IOV_SIZE]; 1071 struct iovec *v; 1072 struct addrinfo *r; 1073 int i, l, lsent = 0; 1074 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1075 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1076 const char *msgret; 1077 1078 v = iov; 1079 if (f->f_type == F_WALL) { 1080 v->iov_base = greetings; 1081 /* The time displayed is not synchornized with the other log 1082 * destinations (like messages). Following fragment was using 1083 * ctime(&now), which was updating the time every 30 sec. 1084 * With f_lasttime, time is synchronized correctly. 1085 */ 1086 v->iov_len = snprintf(greetings, sizeof greetings, 1087 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1088 f->f_prevhost, f->f_lasttime); 1089 if (v->iov_len >= sizeof greetings) 1090 v->iov_len = sizeof greetings - 1; 1091 v++; 1092 v->iov_base = nul; 1093 v->iov_len = 0; 1094 v++; 1095 } else { 1096 v->iov_base = f->f_lasttime; 1097 v->iov_len = strlen(f->f_lasttime); 1098 v++; 1099 v->iov_base = space; 1100 v->iov_len = 1; 1101 v++; 1102 } 1103 1104 if (LogFacPri) { 1105 static char fp_buf[30]; /* Hollow laugh */ 1106 int fac = f->f_prevpri & LOG_FACMASK; 1107 int pri = LOG_PRI(f->f_prevpri); 1108 const char *f_s = NULL; 1109 char f_n[5]; /* Hollow laugh */ 1110 const char *p_s = NULL; 1111 char p_n[5]; /* Hollow laugh */ 1112 1113 if (LogFacPri > 1) { 1114 const CODE *c; 1115 1116 for (c = facilitynames; c->c_name; c++) { 1117 if (c->c_val == fac) { 1118 f_s = c->c_name; 1119 break; 1120 } 1121 } 1122 for (c = prioritynames; c->c_name; c++) { 1123 if (c->c_val == pri) { 1124 p_s = c->c_name; 1125 break; 1126 } 1127 } 1128 } 1129 if (!f_s) { 1130 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1131 f_s = f_n; 1132 } 1133 if (!p_s) { 1134 snprintf(p_n, sizeof p_n, "%d", pri); 1135 p_s = p_n; 1136 } 1137 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1138 v->iov_base = fp_buf; 1139 v->iov_len = strlen(fp_buf); 1140 } else { 1141 v->iov_base = nul; 1142 v->iov_len = 0; 1143 } 1144 v++; 1145 1146 v->iov_base = f->f_prevhost; 1147 v->iov_len = strlen(v->iov_base); 1148 v++; 1149 v->iov_base = space; 1150 v->iov_len = 1; 1151 v++; 1152 1153 if (msg) { 1154 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1155 if (wmsg == NULL) { 1156 logerror("strdup"); 1157 exit(1); 1158 } 1159 v->iov_base = wmsg; 1160 v->iov_len = strlen(msg); 1161 } else if (f->f_prevcount > 1) { 1162 v->iov_base = repbuf; 1163 v->iov_len = snprintf(repbuf, sizeof repbuf, 1164 "last message repeated %d times", f->f_prevcount); 1165 } else if (f->f_prevline) { 1166 v->iov_base = f->f_prevline; 1167 v->iov_len = f->f_prevlen; 1168 } else { 1169 return; 1170 } 1171 v++; 1172 1173 dprintf("Logging to %s", TypeNames[f->f_type]); 1174 f->f_time = now; 1175 1176 switch (f->f_type) { 1177 int port; 1178 case F_UNUSED: 1179 dprintf("\n"); 1180 break; 1181 1182 case F_FORW: 1183 port = (int)ntohs(((struct sockaddr_in *) 1184 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1185 if (port != 514) { 1186 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1187 } else { 1188 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1189 } 1190 /* check for local vs remote messages */ 1191 if (strcasecmp(f->f_prevhost, LocalHostName)) 1192 l = snprintf(line, sizeof line - 1, 1193 "<%d>%.15s Forwarded from %s: %s", 1194 f->f_prevpri, (char *)iov[0].iov_base, 1195 f->f_prevhost, (char *)iov[5].iov_base); 1196 else 1197 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1198 f->f_prevpri, (char *)iov[0].iov_base, 1199 (char *)iov[5].iov_base); 1200 if (l < 0) 1201 l = 0; 1202 else if (l > MAXLINE) 1203 l = MAXLINE; 1204 1205 if (finet) { 1206 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1207 for (i = 0; i < *finet; i++) { 1208 #if 0 1209 /* 1210 * should we check AF first, or just 1211 * trial and error? FWD 1212 */ 1213 if (r->ai_family == 1214 address_family_of(finet[i+1])) 1215 #endif 1216 lsent = sendto(finet[i+1], line, l, 0, 1217 r->ai_addr, r->ai_addrlen); 1218 if (lsent == l) 1219 break; 1220 } 1221 if (lsent == l && !send_to_all) 1222 break; 1223 } 1224 dprintf("lsent/l: %d/%d\n", lsent, l); 1225 if (lsent != l) { 1226 int e = errno; 1227 logerror("sendto"); 1228 errno = e; 1229 switch (errno) { 1230 case ENOBUFS: 1231 case ENETDOWN: 1232 case ENETUNREACH: 1233 case EHOSTUNREACH: 1234 case EHOSTDOWN: 1235 case EADDRNOTAVAIL: 1236 break; 1237 /* case EBADF: */ 1238 /* case EACCES: */ 1239 /* case ENOTSOCK: */ 1240 /* case EFAULT: */ 1241 /* case EMSGSIZE: */ 1242 /* case EAGAIN: */ 1243 /* case ENOBUFS: */ 1244 /* case ECONNREFUSED: */ 1245 default: 1246 dprintf("removing entry: errno=%d\n", e); 1247 f->f_type = F_UNUSED; 1248 break; 1249 } 1250 } 1251 } 1252 break; 1253 1254 case F_FILE: 1255 dprintf(" %s\n", f->f_un.f_fname); 1256 v->iov_base = lf; 1257 v->iov_len = 1; 1258 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1259 /* 1260 * If writev(2) fails for potentially transient errors 1261 * like the filesystem being full, ignore it. 1262 * Otherwise remove this logfile from the list. 1263 */ 1264 if (errno != ENOSPC) { 1265 int e = errno; 1266 (void)close(f->f_file); 1267 f->f_type = F_UNUSED; 1268 errno = e; 1269 logerror(f->f_un.f_fname); 1270 } 1271 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1272 f->f_flags |= FFLAG_NEEDSYNC; 1273 needdofsync = 1; 1274 } 1275 break; 1276 1277 case F_PIPE: 1278 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1279 v->iov_base = lf; 1280 v->iov_len = 1; 1281 if (f->f_un.f_pipe.f_pid == 0) { 1282 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1283 &f->f_un.f_pipe.f_pid)) < 0) { 1284 f->f_type = F_UNUSED; 1285 logerror(f->f_un.f_pipe.f_pname); 1286 break; 1287 } 1288 } 1289 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1290 int e = errno; 1291 (void)close(f->f_file); 1292 if (f->f_un.f_pipe.f_pid > 0) 1293 deadq_enter(f->f_un.f_pipe.f_pid, 1294 f->f_un.f_pipe.f_pname); 1295 f->f_un.f_pipe.f_pid = 0; 1296 errno = e; 1297 logerror(f->f_un.f_pipe.f_pname); 1298 } 1299 break; 1300 1301 case F_CONSOLE: 1302 if (flags & IGN_CONS) { 1303 dprintf(" (ignored)\n"); 1304 break; 1305 } 1306 /* FALLTHROUGH */ 1307 1308 case F_TTY: 1309 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1310 v->iov_base = crlf; 1311 v->iov_len = 2; 1312 1313 errno = 0; /* ttymsg() only sometimes returns an errno */ 1314 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1315 f->f_type = F_UNUSED; 1316 logerror(msgret); 1317 } 1318 break; 1319 1320 case F_USERS: 1321 case F_WALL: 1322 dprintf("\n"); 1323 v->iov_base = crlf; 1324 v->iov_len = 2; 1325 wallmsg(f, iov, IOV_SIZE); 1326 break; 1327 } 1328 f->f_prevcount = 0; 1329 free(wmsg); 1330 } 1331 1332 /* 1333 * WALLMSG -- Write a message to the world at large 1334 * 1335 * Write the specified message to either the entire 1336 * world, or a list of approved users. 1337 */ 1338 static void 1339 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1340 { 1341 static int reenter; /* avoid calling ourselves */ 1342 struct utmpx *ut; 1343 int i; 1344 const char *p; 1345 1346 if (reenter++) 1347 return; 1348 setutxent(); 1349 /* NOSTRICT */ 1350 while ((ut = getutxent()) != NULL) { 1351 if (ut->ut_type != USER_PROCESS) 1352 continue; 1353 if (f->f_type == F_WALL) { 1354 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1355 TTYMSGTIME)) != NULL) { 1356 errno = 0; /* already in msg */ 1357 logerror(p); 1358 } 1359 continue; 1360 } 1361 /* should we send the message to this user? */ 1362 for (i = 0; i < MAXUNAMES; i++) { 1363 if (!f->f_un.f_uname[i][0]) 1364 break; 1365 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1366 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1367 TTYMSGTIME)) != NULL) { 1368 errno = 0; /* already in msg */ 1369 logerror(p); 1370 } 1371 break; 1372 } 1373 } 1374 } 1375 endutxent(); 1376 reenter = 0; 1377 } 1378 1379 static void 1380 reapchild(int signo __unused) 1381 { 1382 int status; 1383 pid_t pid; 1384 struct filed *f; 1385 1386 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1387 if (!Initialized) 1388 /* Don't tell while we are initting. */ 1389 continue; 1390 1391 /* First, look if it's a process from the dead queue. */ 1392 if (deadq_remove(pid)) 1393 continue; 1394 1395 /* Now, look in list of active processes. */ 1396 for (f = Files; f; f = f->f_next) { 1397 if (f->f_type == F_PIPE && 1398 f->f_un.f_pipe.f_pid == pid) { 1399 (void)close(f->f_file); 1400 f->f_un.f_pipe.f_pid = 0; 1401 log_deadchild(pid, status, 1402 f->f_un.f_pipe.f_pname); 1403 break; 1404 } 1405 } 1406 } 1407 } 1408 1409 /* 1410 * Return a printable representation of a host address. 1411 */ 1412 static const char * 1413 cvthname(struct sockaddr *f) 1414 { 1415 int error, hl; 1416 sigset_t omask, nmask; 1417 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1418 1419 error = getnameinfo((struct sockaddr *)f, 1420 ((struct sockaddr *)f)->sa_len, 1421 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1422 dprintf("cvthname(%s)\n", ip); 1423 1424 if (error) { 1425 dprintf("Malformed from address %s\n", gai_strerror(error)); 1426 return ("???"); 1427 } 1428 if (!resolve) 1429 return (ip); 1430 1431 sigemptyset(&nmask); 1432 sigaddset(&nmask, SIGHUP); 1433 sigprocmask(SIG_BLOCK, &nmask, &omask); 1434 error = getnameinfo((struct sockaddr *)f, 1435 ((struct sockaddr *)f)->sa_len, 1436 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1437 sigprocmask(SIG_SETMASK, &omask, NULL); 1438 if (error) { 1439 dprintf("Host name for your address (%s) unknown\n", ip); 1440 return (ip); 1441 } 1442 hl = strlen(hname); 1443 if (hl > 0 && hname[hl-1] == '.') 1444 hname[--hl] = '\0'; 1445 trimdomain(hname, hl); 1446 return (hname); 1447 } 1448 1449 static void 1450 dodie(int signo) 1451 { 1452 1453 WantDie = signo; 1454 } 1455 1456 static void 1457 domark(int signo __unused) 1458 { 1459 1460 MarkSet = 1; 1461 } 1462 1463 /* 1464 * Print syslogd errors some place. 1465 */ 1466 static void 1467 logerror(const char *type) 1468 { 1469 char buf[512]; 1470 static int recursed = 0; 1471 1472 /* If there's an error while trying to log an error, give up. */ 1473 if (recursed) 1474 return; 1475 recursed++; 1476 if (errno) 1477 (void)snprintf(buf, 1478 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1479 else 1480 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1481 errno = 0; 1482 dprintf("%s\n", buf); 1483 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1484 recursed--; 1485 } 1486 1487 static void 1488 die(int signo) 1489 { 1490 struct filed *f; 1491 struct funix *fx; 1492 int was_initialized; 1493 char buf[100]; 1494 1495 was_initialized = Initialized; 1496 Initialized = 0; /* Don't log SIGCHLDs. */ 1497 for (f = Files; f != NULL; f = f->f_next) { 1498 /* flush any pending output */ 1499 if (f->f_prevcount) 1500 fprintlog(f, 0, NULL); 1501 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1502 (void)close(f->f_file); 1503 f->f_un.f_pipe.f_pid = 0; 1504 } 1505 } 1506 Initialized = was_initialized; 1507 if (signo) { 1508 dprintf("syslogd: exiting on signal %d\n", signo); 1509 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1510 errno = 0; 1511 logerror(buf); 1512 } 1513 STAILQ_FOREACH(fx, &funixes, next) 1514 (void)unlink(fx->name); 1515 pidfile_remove(pfh); 1516 1517 exit(1); 1518 } 1519 1520 /* 1521 * INIT -- Initialize syslogd from configuration table 1522 */ 1523 static void 1524 init(int signo) 1525 { 1526 int i; 1527 FILE *cf; 1528 struct filed *f, *next, **nextp; 1529 char *p; 1530 char cline[LINE_MAX]; 1531 char prog[NAME_MAX+1]; 1532 char host[MAXHOSTNAMELEN]; 1533 char oldLocalHostName[MAXHOSTNAMELEN]; 1534 char hostMsg[2*MAXHOSTNAMELEN+40]; 1535 char bootfileMsg[LINE_MAX]; 1536 1537 dprintf("init\n"); 1538 1539 /* 1540 * Load hostname (may have changed). 1541 */ 1542 if (signo != 0) 1543 (void)strlcpy(oldLocalHostName, LocalHostName, 1544 sizeof(oldLocalHostName)); 1545 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1546 err(EX_OSERR, "gethostname() failed"); 1547 if ((p = strchr(LocalHostName, '.')) != NULL) { 1548 *p++ = '\0'; 1549 LocalDomain = p; 1550 } else { 1551 LocalDomain = ""; 1552 } 1553 1554 /* 1555 * Close all open log files. 1556 */ 1557 Initialized = 0; 1558 for (f = Files; f != NULL; f = next) { 1559 /* flush any pending output */ 1560 if (f->f_prevcount) 1561 fprintlog(f, 0, NULL); 1562 1563 switch (f->f_type) { 1564 case F_FILE: 1565 case F_FORW: 1566 case F_CONSOLE: 1567 case F_TTY: 1568 (void)close(f->f_file); 1569 break; 1570 case F_PIPE: 1571 if (f->f_un.f_pipe.f_pid > 0) { 1572 (void)close(f->f_file); 1573 deadq_enter(f->f_un.f_pipe.f_pid, 1574 f->f_un.f_pipe.f_pname); 1575 } 1576 f->f_un.f_pipe.f_pid = 0; 1577 break; 1578 } 1579 next = f->f_next; 1580 if (f->f_program) free(f->f_program); 1581 if (f->f_host) free(f->f_host); 1582 free((char *)f); 1583 } 1584 Files = NULL; 1585 nextp = &Files; 1586 1587 /* open the configuration file */ 1588 if ((cf = fopen(ConfFile, "r")) == NULL) { 1589 dprintf("cannot open %s\n", ConfFile); 1590 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1591 if (*nextp == NULL) { 1592 logerror("calloc"); 1593 exit(1); 1594 } 1595 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1596 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1597 if ((*nextp)->f_next == NULL) { 1598 logerror("calloc"); 1599 exit(1); 1600 } 1601 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1602 Initialized = 1; 1603 return; 1604 } 1605 1606 /* 1607 * Foreach line in the conf table, open that file. 1608 */ 1609 f = NULL; 1610 (void)strlcpy(host, "*", sizeof(host)); 1611 (void)strlcpy(prog, "*", sizeof(prog)); 1612 while (fgets(cline, sizeof(cline), cf) != NULL) { 1613 /* 1614 * check for end-of-section, comments, strip off trailing 1615 * spaces and newline character. #!prog is treated specially: 1616 * following lines apply only to that program. 1617 */ 1618 for (p = cline; isspace(*p); ++p) 1619 continue; 1620 if (*p == 0) 1621 continue; 1622 if (*p == '#') { 1623 p++; 1624 if (*p != '!' && *p != '+' && *p != '-') 1625 continue; 1626 } 1627 if (*p == '+' || *p == '-') { 1628 host[0] = *p++; 1629 while (isspace(*p)) 1630 p++; 1631 if ((!*p) || (*p == '*')) { 1632 (void)strlcpy(host, "*", sizeof(host)); 1633 continue; 1634 } 1635 if (*p == '@') 1636 p = LocalHostName; 1637 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1638 if (!isalnum(*p) && *p != '.' && *p != '-' 1639 && *p != ',' && *p != ':' && *p != '%') 1640 break; 1641 host[i] = *p++; 1642 } 1643 host[i] = '\0'; 1644 continue; 1645 } 1646 if (*p == '!') { 1647 p++; 1648 while (isspace(*p)) p++; 1649 if ((!*p) || (*p == '*')) { 1650 (void)strlcpy(prog, "*", sizeof(prog)); 1651 continue; 1652 } 1653 for (i = 0; i < NAME_MAX; i++) { 1654 if (!isprint(p[i]) || isspace(p[i])) 1655 break; 1656 prog[i] = p[i]; 1657 } 1658 prog[i] = 0; 1659 continue; 1660 } 1661 for (p = cline + 1; *p != '\0'; p++) { 1662 if (*p != '#') 1663 continue; 1664 if (*(p - 1) == '\\') { 1665 strcpy(p - 1, p); 1666 p--; 1667 continue; 1668 } 1669 *p = '\0'; 1670 break; 1671 } 1672 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1673 cline[i] = '\0'; 1674 f = (struct filed *)calloc(1, sizeof(*f)); 1675 if (f == NULL) { 1676 logerror("calloc"); 1677 exit(1); 1678 } 1679 *nextp = f; 1680 nextp = &f->f_next; 1681 cfline(cline, f, prog, host); 1682 } 1683 1684 /* close the configuration file */ 1685 (void)fclose(cf); 1686 1687 Initialized = 1; 1688 1689 if (Debug) { 1690 int port; 1691 for (f = Files; f; f = f->f_next) { 1692 for (i = 0; i <= LOG_NFACILITIES; i++) 1693 if (f->f_pmask[i] == INTERNAL_NOPRI) 1694 printf("X "); 1695 else 1696 printf("%d ", f->f_pmask[i]); 1697 printf("%s: ", TypeNames[f->f_type]); 1698 switch (f->f_type) { 1699 case F_FILE: 1700 printf("%s", f->f_un.f_fname); 1701 break; 1702 1703 case F_CONSOLE: 1704 case F_TTY: 1705 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1706 break; 1707 1708 case F_FORW: 1709 port = (int)ntohs(((struct sockaddr_in *) 1710 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1711 if (port != 514) { 1712 printf("%s:%d", 1713 f->f_un.f_forw.f_hname, port); 1714 } else { 1715 printf("%s", f->f_un.f_forw.f_hname); 1716 } 1717 break; 1718 1719 case F_PIPE: 1720 printf("%s", f->f_un.f_pipe.f_pname); 1721 break; 1722 1723 case F_USERS: 1724 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1725 printf("%s, ", f->f_un.f_uname[i]); 1726 break; 1727 } 1728 if (f->f_program) 1729 printf(" (%s)", f->f_program); 1730 printf("\n"); 1731 } 1732 } 1733 1734 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1735 dprintf("syslogd: restarted\n"); 1736 /* 1737 * Log a change in hostname, but only on a restart. 1738 */ 1739 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1740 (void)snprintf(hostMsg, sizeof(hostMsg), 1741 "syslogd: hostname changed, \"%s\" to \"%s\"", 1742 oldLocalHostName, LocalHostName); 1743 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1744 dprintf("%s\n", hostMsg); 1745 } 1746 /* 1747 * Log the kernel boot file if we aren't going to use it as 1748 * the prefix, and if this is *not* a restart. 1749 */ 1750 if (signo == 0 && !use_bootfile) { 1751 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1752 "syslogd: kernel boot file is %s", bootfile); 1753 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1754 dprintf("%s\n", bootfileMsg); 1755 } 1756 } 1757 1758 /* 1759 * Crack a configuration file line 1760 */ 1761 static void 1762 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1763 { 1764 struct addrinfo hints, *res; 1765 int error, i, pri, syncfile; 1766 const char *p, *q; 1767 char *bp; 1768 char buf[MAXLINE], ebuf[100]; 1769 1770 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1771 1772 errno = 0; /* keep strerror() stuff out of logerror messages */ 1773 1774 /* clear out file entry */ 1775 memset(f, 0, sizeof(*f)); 1776 for (i = 0; i <= LOG_NFACILITIES; i++) 1777 f->f_pmask[i] = INTERNAL_NOPRI; 1778 1779 /* save hostname if any */ 1780 if (host && *host == '*') 1781 host = NULL; 1782 if (host) { 1783 int hl; 1784 1785 f->f_host = strdup(host); 1786 if (f->f_host == NULL) { 1787 logerror("strdup"); 1788 exit(1); 1789 } 1790 hl = strlen(f->f_host); 1791 if (hl > 0 && f->f_host[hl-1] == '.') 1792 f->f_host[--hl] = '\0'; 1793 trimdomain(f->f_host, hl); 1794 } 1795 1796 /* save program name if any */ 1797 if (prog && *prog == '*') 1798 prog = NULL; 1799 if (prog) { 1800 f->f_program = strdup(prog); 1801 if (f->f_program == NULL) { 1802 logerror("strdup"); 1803 exit(1); 1804 } 1805 } 1806 1807 /* scan through the list of selectors */ 1808 for (p = line; *p && *p != '\t' && *p != ' ';) { 1809 int pri_done; 1810 int pri_cmp; 1811 int pri_invert; 1812 1813 /* find the end of this facility name list */ 1814 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1815 continue; 1816 1817 /* get the priority comparison */ 1818 pri_cmp = 0; 1819 pri_done = 0; 1820 pri_invert = 0; 1821 if (*q == '!') { 1822 pri_invert = 1; 1823 q++; 1824 } 1825 while (!pri_done) { 1826 switch (*q) { 1827 case '<': 1828 pri_cmp |= PRI_LT; 1829 q++; 1830 break; 1831 case '=': 1832 pri_cmp |= PRI_EQ; 1833 q++; 1834 break; 1835 case '>': 1836 pri_cmp |= PRI_GT; 1837 q++; 1838 break; 1839 default: 1840 pri_done++; 1841 break; 1842 } 1843 } 1844 1845 /* collect priority name */ 1846 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1847 *bp++ = *q++; 1848 *bp = '\0'; 1849 1850 /* skip cruft */ 1851 while (strchr(",;", *q)) 1852 q++; 1853 1854 /* decode priority name */ 1855 if (*buf == '*') { 1856 pri = LOG_PRIMASK; 1857 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1858 } else { 1859 /* Ignore trailing spaces. */ 1860 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1861 buf[i] = '\0'; 1862 1863 pri = decode(buf, prioritynames); 1864 if (pri < 0) { 1865 errno = 0; 1866 (void)snprintf(ebuf, sizeof ebuf, 1867 "unknown priority name \"%s\"", buf); 1868 logerror(ebuf); 1869 return; 1870 } 1871 } 1872 if (!pri_cmp) 1873 pri_cmp = (UniquePriority) 1874 ? (PRI_EQ) 1875 : (PRI_EQ | PRI_GT) 1876 ; 1877 if (pri_invert) 1878 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1879 1880 /* scan facilities */ 1881 while (*p && !strchr("\t.; ", *p)) { 1882 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1883 *bp++ = *p++; 1884 *bp = '\0'; 1885 1886 if (*buf == '*') { 1887 for (i = 0; i < LOG_NFACILITIES; i++) { 1888 f->f_pmask[i] = pri; 1889 f->f_pcmp[i] = pri_cmp; 1890 } 1891 } else { 1892 i = decode(buf, facilitynames); 1893 if (i < 0) { 1894 errno = 0; 1895 (void)snprintf(ebuf, sizeof ebuf, 1896 "unknown facility name \"%s\"", 1897 buf); 1898 logerror(ebuf); 1899 return; 1900 } 1901 f->f_pmask[i >> 3] = pri; 1902 f->f_pcmp[i >> 3] = pri_cmp; 1903 } 1904 while (*p == ',' || *p == ' ') 1905 p++; 1906 } 1907 1908 p = q; 1909 } 1910 1911 /* skip to action part */ 1912 while (*p == '\t' || *p == ' ') 1913 p++; 1914 1915 if (*p == '-') { 1916 syncfile = 0; 1917 p++; 1918 } else 1919 syncfile = 1; 1920 1921 switch (*p) { 1922 case '@': 1923 { 1924 char *tp; 1925 char endkey = ':'; 1926 /* 1927 * scan forward to see if there is a port defined. 1928 * so we can't use strlcpy.. 1929 */ 1930 i = sizeof(f->f_un.f_forw.f_hname); 1931 tp = f->f_un.f_forw.f_hname; 1932 p++; 1933 1934 /* 1935 * an ipv6 address should start with a '[' in that case 1936 * we should scan for a ']' 1937 */ 1938 if (*p == '[') { 1939 p++; 1940 endkey = ']'; 1941 } 1942 while (*p && (*p != endkey) && (i-- > 0)) { 1943 *tp++ = *p++; 1944 } 1945 if (endkey == ']' && *p == endkey) 1946 p++; 1947 *tp = '\0'; 1948 } 1949 /* See if we copied a domain and have a port */ 1950 if (*p == ':') 1951 p++; 1952 else 1953 p = NULL; 1954 1955 memset(&hints, 0, sizeof(hints)); 1956 hints.ai_family = family; 1957 hints.ai_socktype = SOCK_DGRAM; 1958 error = getaddrinfo(f->f_un.f_forw.f_hname, 1959 p ? p : "syslog", &hints, &res); 1960 if (error) { 1961 logerror(gai_strerror(error)); 1962 break; 1963 } 1964 f->f_un.f_forw.f_addr = res; 1965 f->f_type = F_FORW; 1966 break; 1967 1968 case '/': 1969 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1970 f->f_type = F_UNUSED; 1971 logerror(p); 1972 break; 1973 } 1974 if (syncfile) 1975 f->f_flags |= FFLAG_SYNC; 1976 if (isatty(f->f_file)) { 1977 if (strcmp(p, ctty) == 0) 1978 f->f_type = F_CONSOLE; 1979 else 1980 f->f_type = F_TTY; 1981 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1982 sizeof(f->f_un.f_fname)); 1983 } else { 1984 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1985 f->f_type = F_FILE; 1986 } 1987 break; 1988 1989 case '|': 1990 f->f_un.f_pipe.f_pid = 0; 1991 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 1992 sizeof(f->f_un.f_pipe.f_pname)); 1993 f->f_type = F_PIPE; 1994 break; 1995 1996 case '*': 1997 f->f_type = F_WALL; 1998 break; 1999 2000 default: 2001 for (i = 0; i < MAXUNAMES && *p; i++) { 2002 for (q = p; *q && *q != ','; ) 2003 q++; 2004 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2005 if ((q - p) >= MAXLOGNAME) 2006 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2007 else 2008 f->f_un.f_uname[i][q - p] = '\0'; 2009 while (*q == ',' || *q == ' ') 2010 q++; 2011 p = q; 2012 } 2013 f->f_type = F_USERS; 2014 break; 2015 } 2016 } 2017 2018 2019 /* 2020 * Decode a symbolic name to a numeric value 2021 */ 2022 static int 2023 decode(const char *name, const CODE *codetab) 2024 { 2025 const CODE *c; 2026 char *p, buf[40]; 2027 2028 if (isdigit(*name)) 2029 return (atoi(name)); 2030 2031 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2032 if (isupper(*name)) 2033 *p = tolower(*name); 2034 else 2035 *p = *name; 2036 } 2037 *p = '\0'; 2038 for (c = codetab; c->c_name; c++) 2039 if (!strcmp(buf, c->c_name)) 2040 return (c->c_val); 2041 2042 return (-1); 2043 } 2044 2045 static void 2046 markit(void) 2047 { 2048 struct filed *f; 2049 dq_t q, next; 2050 2051 now = time(NULL); 2052 MarkSeq += TIMERINTVL; 2053 if (MarkSeq >= MarkInterval) { 2054 logmsg(LOG_INFO, "-- MARK --", 2055 LocalHostName, ADDDATE|MARK); 2056 MarkSeq = 0; 2057 } 2058 2059 for (f = Files; f; f = f->f_next) { 2060 if (f->f_prevcount && now >= REPEATTIME(f)) { 2061 dprintf("flush %s: repeated %d times, %d sec.\n", 2062 TypeNames[f->f_type], f->f_prevcount, 2063 repeatinterval[f->f_repeatcount]); 2064 fprintlog(f, 0, NULL); 2065 BACKOFF(f); 2066 } 2067 } 2068 2069 /* Walk the dead queue, and see if we should signal somebody. */ 2070 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2071 next = TAILQ_NEXT(q, dq_entries); 2072 2073 switch (q->dq_timeout) { 2074 case 0: 2075 /* Already signalled once, try harder now. */ 2076 if (kill(q->dq_pid, SIGKILL) != 0) 2077 (void)deadq_remove(q->dq_pid); 2078 break; 2079 2080 case 1: 2081 /* 2082 * Timed out on dead queue, send terminate 2083 * signal. Note that we leave the removal 2084 * from the dead queue to reapchild(), which 2085 * will also log the event (unless the process 2086 * didn't even really exist, in case we simply 2087 * drop it from the dead queue). 2088 */ 2089 if (kill(q->dq_pid, SIGTERM) != 0) 2090 (void)deadq_remove(q->dq_pid); 2091 /* FALLTHROUGH */ 2092 2093 default: 2094 q->dq_timeout--; 2095 } 2096 } 2097 MarkSet = 0; 2098 (void)alarm(TIMERINTVL); 2099 } 2100 2101 /* 2102 * fork off and become a daemon, but wait for the child to come online 2103 * before returing to the parent, or we get disk thrashing at boot etc. 2104 * Set a timer so we don't hang forever if it wedges. 2105 */ 2106 static int 2107 waitdaemon(int nochdir, int noclose, int maxwait) 2108 { 2109 int fd; 2110 int status; 2111 pid_t pid, childpid; 2112 2113 switch (childpid = fork()) { 2114 case -1: 2115 return (-1); 2116 case 0: 2117 break; 2118 default: 2119 signal(SIGALRM, timedout); 2120 alarm(maxwait); 2121 while ((pid = wait3(&status, 0, NULL)) != -1) { 2122 if (WIFEXITED(status)) 2123 errx(1, "child pid %d exited with return code %d", 2124 pid, WEXITSTATUS(status)); 2125 if (WIFSIGNALED(status)) 2126 errx(1, "child pid %d exited on signal %d%s", 2127 pid, WTERMSIG(status), 2128 WCOREDUMP(status) ? " (core dumped)" : 2129 ""); 2130 if (pid == childpid) /* it's gone... */ 2131 break; 2132 } 2133 exit(0); 2134 } 2135 2136 if (setsid() == -1) 2137 return (-1); 2138 2139 if (!nochdir) 2140 (void)chdir("/"); 2141 2142 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2143 (void)dup2(fd, STDIN_FILENO); 2144 (void)dup2(fd, STDOUT_FILENO); 2145 (void)dup2(fd, STDERR_FILENO); 2146 if (fd > 2) 2147 (void)close (fd); 2148 } 2149 return (getppid()); 2150 } 2151 2152 /* 2153 * We get a SIGALRM from the child when it's running and finished doing it's 2154 * fsync()'s or O_SYNC writes for all the boot messages. 2155 * 2156 * We also get a signal from the kernel if the timer expires, so check to 2157 * see what happened. 2158 */ 2159 static void 2160 timedout(int sig __unused) 2161 { 2162 int left; 2163 left = alarm(0); 2164 signal(SIGALRM, SIG_DFL); 2165 if (left == 0) 2166 errx(1, "timed out waiting for child"); 2167 else 2168 _exit(0); 2169 } 2170 2171 /* 2172 * Add `s' to the list of allowable peer addresses to accept messages 2173 * from. 2174 * 2175 * `s' is a string in the form: 2176 * 2177 * [*]domainname[:{servicename|portnumber|*}] 2178 * 2179 * or 2180 * 2181 * netaddr/maskbits[:{servicename|portnumber|*}] 2182 * 2183 * Returns -1 on error, 0 if the argument was valid. 2184 */ 2185 static int 2186 allowaddr(char *s) 2187 { 2188 char *cp1, *cp2; 2189 struct allowedpeer ap; 2190 struct servent *se; 2191 int masklen = -1; 2192 struct addrinfo hints, *res; 2193 struct in_addr *addrp, *maskp; 2194 #ifdef INET6 2195 int i; 2196 u_int32_t *addr6p, *mask6p; 2197 #endif 2198 char ip[NI_MAXHOST]; 2199 2200 #ifdef INET6 2201 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2202 #endif 2203 cp1 = s; 2204 if ((cp1 = strrchr(cp1, ':'))) { 2205 /* service/port provided */ 2206 *cp1++ = '\0'; 2207 if (strlen(cp1) == 1 && *cp1 == '*') 2208 /* any port allowed */ 2209 ap.port = 0; 2210 else if ((se = getservbyname(cp1, "udp"))) { 2211 ap.port = ntohs(se->s_port); 2212 } else { 2213 ap.port = strtol(cp1, &cp2, 0); 2214 if (*cp2 != '\0') 2215 return (-1); /* port not numeric */ 2216 } 2217 } else { 2218 if ((se = getservbyname("syslog", "udp"))) 2219 ap.port = ntohs(se->s_port); 2220 else 2221 /* sanity, should not happen */ 2222 ap.port = 514; 2223 } 2224 2225 if ((cp1 = strchr(s, '/')) != NULL && 2226 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2227 *cp1 = '\0'; 2228 if ((masklen = atoi(cp1 + 1)) < 0) 2229 return (-1); 2230 } 2231 #ifdef INET6 2232 if (*s == '[') { 2233 cp2 = s + strlen(s) - 1; 2234 if (*cp2 == ']') { 2235 ++s; 2236 *cp2 = '\0'; 2237 } else { 2238 cp2 = NULL; 2239 } 2240 } else { 2241 cp2 = NULL; 2242 } 2243 #endif 2244 memset(&hints, 0, sizeof(hints)); 2245 hints.ai_family = PF_UNSPEC; 2246 hints.ai_socktype = SOCK_DGRAM; 2247 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2248 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2249 ap.isnumeric = 1; 2250 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2251 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2252 ap.a_mask.ss_family = res->ai_family; 2253 if (res->ai_family == AF_INET) { 2254 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2255 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2256 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2257 if (masklen < 0) { 2258 /* use default netmask */ 2259 if (IN_CLASSA(ntohl(addrp->s_addr))) 2260 maskp->s_addr = htonl(IN_CLASSA_NET); 2261 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2262 maskp->s_addr = htonl(IN_CLASSB_NET); 2263 else 2264 maskp->s_addr = htonl(IN_CLASSC_NET); 2265 } else if (masklen <= 32) { 2266 /* convert masklen to netmask */ 2267 if (masklen == 0) 2268 maskp->s_addr = 0; 2269 else 2270 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2271 } else { 2272 freeaddrinfo(res); 2273 return (-1); 2274 } 2275 /* Lose any host bits in the network number. */ 2276 addrp->s_addr &= maskp->s_addr; 2277 } 2278 #ifdef INET6 2279 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2280 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2281 if (masklen < 0) 2282 masklen = 128; 2283 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2284 /* convert masklen to netmask */ 2285 while (masklen > 0) { 2286 if (masklen < 32) { 2287 *mask6p = htonl(~(0xffffffff >> masklen)); 2288 break; 2289 } 2290 *mask6p++ = 0xffffffff; 2291 masklen -= 32; 2292 } 2293 /* Lose any host bits in the network number. */ 2294 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2295 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2296 for (i = 0; i < 4; i++) 2297 addr6p[i] &= mask6p[i]; 2298 } 2299 #endif 2300 else { 2301 freeaddrinfo(res); 2302 return (-1); 2303 } 2304 freeaddrinfo(res); 2305 } else { 2306 /* arg `s' is domain name */ 2307 ap.isnumeric = 0; 2308 ap.a_name = s; 2309 if (cp1) 2310 *cp1 = '/'; 2311 #ifdef INET6 2312 if (cp2) { 2313 *cp2 = ']'; 2314 --s; 2315 } 2316 #endif 2317 } 2318 2319 if (Debug) { 2320 printf("allowaddr: rule %d: ", NumAllowed); 2321 if (ap.isnumeric) { 2322 printf("numeric, "); 2323 getnameinfo((struct sockaddr *)&ap.a_addr, 2324 ((struct sockaddr *)&ap.a_addr)->sa_len, 2325 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2326 printf("addr = %s, ", ip); 2327 getnameinfo((struct sockaddr *)&ap.a_mask, 2328 ((struct sockaddr *)&ap.a_mask)->sa_len, 2329 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2330 printf("mask = %s; ", ip); 2331 } else { 2332 printf("domainname = %s; ", ap.a_name); 2333 } 2334 printf("port = %d\n", ap.port); 2335 } 2336 2337 if ((AllowedPeers = realloc(AllowedPeers, 2338 ++NumAllowed * sizeof(struct allowedpeer))) 2339 == NULL) { 2340 logerror("realloc"); 2341 exit(1); 2342 } 2343 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2344 return (0); 2345 } 2346 2347 /* 2348 * Validate that the remote peer has permission to log to us. 2349 */ 2350 static int 2351 validate(struct sockaddr *sa, const char *hname) 2352 { 2353 int i; 2354 size_t l1, l2; 2355 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2356 struct allowedpeer *ap; 2357 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2358 #ifdef INET6 2359 int j, reject; 2360 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2361 #endif 2362 struct addrinfo hints, *res; 2363 u_short sport; 2364 2365 if (NumAllowed == 0) 2366 /* traditional behaviour, allow everything */ 2367 return (1); 2368 2369 (void)strlcpy(name, hname, sizeof(name)); 2370 memset(&hints, 0, sizeof(hints)); 2371 hints.ai_family = PF_UNSPEC; 2372 hints.ai_socktype = SOCK_DGRAM; 2373 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2374 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2375 freeaddrinfo(res); 2376 else if (strchr(name, '.') == NULL) { 2377 strlcat(name, ".", sizeof name); 2378 strlcat(name, LocalDomain, sizeof name); 2379 } 2380 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2381 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2382 return (0); /* for safety, should not occur */ 2383 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2384 ip, port, name); 2385 sport = atoi(port); 2386 2387 /* now, walk down the list */ 2388 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2389 if (ap->port != 0 && ap->port != sport) { 2390 dprintf("rejected in rule %d due to port mismatch.\n", i); 2391 continue; 2392 } 2393 2394 if (ap->isnumeric) { 2395 if (ap->a_addr.ss_family != sa->sa_family) { 2396 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2397 continue; 2398 } 2399 if (ap->a_addr.ss_family == AF_INET) { 2400 sin4 = (struct sockaddr_in *)sa; 2401 a4p = (struct sockaddr_in *)&ap->a_addr; 2402 m4p = (struct sockaddr_in *)&ap->a_mask; 2403 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2404 != a4p->sin_addr.s_addr) { 2405 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2406 continue; 2407 } 2408 } 2409 #ifdef INET6 2410 else if (ap->a_addr.ss_family == AF_INET6) { 2411 sin6 = (struct sockaddr_in6 *)sa; 2412 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2413 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2414 if (a6p->sin6_scope_id != 0 && 2415 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2416 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2417 continue; 2418 } 2419 reject = 0; 2420 for (j = 0; j < 16; j += 4) { 2421 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2422 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2423 ++reject; 2424 break; 2425 } 2426 } 2427 if (reject) { 2428 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2429 continue; 2430 } 2431 } 2432 #endif 2433 else 2434 continue; 2435 } else { 2436 cp = ap->a_name; 2437 l1 = strlen(name); 2438 if (*cp == '*') { 2439 /* allow wildmatch */ 2440 cp++; 2441 l2 = strlen(cp); 2442 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2443 dprintf("rejected in rule %d due to name mismatch.\n", i); 2444 continue; 2445 } 2446 } else { 2447 /* exact match */ 2448 l2 = strlen(cp); 2449 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2450 dprintf("rejected in rule %d due to name mismatch.\n", i); 2451 continue; 2452 } 2453 } 2454 } 2455 dprintf("accepted in rule %d.\n", i); 2456 return (1); /* hooray! */ 2457 } 2458 return (0); 2459 } 2460 2461 /* 2462 * Fairly similar to popen(3), but returns an open descriptor, as 2463 * opposed to a FILE *. 2464 */ 2465 static int 2466 p_open(const char *prog, pid_t *rpid) 2467 { 2468 int pfd[2], nulldesc; 2469 pid_t pid; 2470 sigset_t omask, mask; 2471 char *argv[4]; /* sh -c cmd NULL */ 2472 char errmsg[200]; 2473 2474 if (pipe(pfd) == -1) 2475 return (-1); 2476 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2477 /* we are royally screwed anyway */ 2478 return (-1); 2479 2480 sigemptyset(&mask); 2481 sigaddset(&mask, SIGALRM); 2482 sigaddset(&mask, SIGHUP); 2483 sigprocmask(SIG_BLOCK, &mask, &omask); 2484 switch ((pid = fork())) { 2485 case -1: 2486 sigprocmask(SIG_SETMASK, &omask, 0); 2487 close(nulldesc); 2488 return (-1); 2489 2490 case 0: 2491 argv[0] = strdup("sh"); 2492 argv[1] = strdup("-c"); 2493 argv[2] = strdup(prog); 2494 argv[3] = NULL; 2495 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2496 logerror("strdup"); 2497 exit(1); 2498 } 2499 2500 alarm(0); 2501 (void)setsid(); /* Avoid catching SIGHUPs. */ 2502 2503 /* 2504 * Throw away pending signals, and reset signal 2505 * behaviour to standard values. 2506 */ 2507 signal(SIGALRM, SIG_IGN); 2508 signal(SIGHUP, SIG_IGN); 2509 sigprocmask(SIG_SETMASK, &omask, 0); 2510 signal(SIGPIPE, SIG_DFL); 2511 signal(SIGQUIT, SIG_DFL); 2512 signal(SIGALRM, SIG_DFL); 2513 signal(SIGHUP, SIG_DFL); 2514 2515 dup2(pfd[0], STDIN_FILENO); 2516 dup2(nulldesc, STDOUT_FILENO); 2517 dup2(nulldesc, STDERR_FILENO); 2518 closefrom(3); 2519 2520 (void)execvp(_PATH_BSHELL, argv); 2521 _exit(255); 2522 } 2523 2524 sigprocmask(SIG_SETMASK, &omask, 0); 2525 close(nulldesc); 2526 close(pfd[0]); 2527 /* 2528 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2529 * supposed to get an EWOULDBLOCK on writev(2), which is 2530 * caught by the logic above anyway, which will in turn close 2531 * the pipe, and fork a new logging subprocess if necessary. 2532 * The stale subprocess will be killed some time later unless 2533 * it terminated itself due to closing its input pipe (so we 2534 * get rid of really dead puppies). 2535 */ 2536 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2537 /* This is bad. */ 2538 (void)snprintf(errmsg, sizeof errmsg, 2539 "Warning: cannot change pipe to PID %d to " 2540 "non-blocking behaviour.", 2541 (int)pid); 2542 logerror(errmsg); 2543 } 2544 *rpid = pid; 2545 return (pfd[1]); 2546 } 2547 2548 static void 2549 deadq_enter(pid_t pid, const char *name) 2550 { 2551 dq_t p; 2552 int status; 2553 2554 /* 2555 * Be paranoid, if we can't signal the process, don't enter it 2556 * into the dead queue (perhaps it's already dead). If possible, 2557 * we try to fetch and log the child's status. 2558 */ 2559 if (kill(pid, 0) != 0) { 2560 if (waitpid(pid, &status, WNOHANG) > 0) 2561 log_deadchild(pid, status, name); 2562 return; 2563 } 2564 2565 p = malloc(sizeof(struct deadq_entry)); 2566 if (p == NULL) { 2567 logerror("malloc"); 2568 exit(1); 2569 } 2570 2571 p->dq_pid = pid; 2572 p->dq_timeout = DQ_TIMO_INIT; 2573 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2574 } 2575 2576 static int 2577 deadq_remove(pid_t pid) 2578 { 2579 dq_t q; 2580 2581 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2582 if (q->dq_pid == pid) { 2583 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2584 free(q); 2585 return (1); 2586 } 2587 } 2588 2589 return (0); 2590 } 2591 2592 static void 2593 log_deadchild(pid_t pid, int status, const char *name) 2594 { 2595 int code; 2596 char buf[256]; 2597 const char *reason; 2598 2599 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2600 if (WIFSIGNALED(status)) { 2601 reason = "due to signal"; 2602 code = WTERMSIG(status); 2603 } else { 2604 reason = "with status"; 2605 code = WEXITSTATUS(status); 2606 if (code == 0) 2607 return; 2608 } 2609 (void)snprintf(buf, sizeof buf, 2610 "Logging subprocess %d (%s) exited %s %d.", 2611 pid, name, reason, code); 2612 logerror(buf); 2613 } 2614 2615 static int * 2616 socksetup(int af, char *bindhostname) 2617 { 2618 struct addrinfo hints, *res, *r; 2619 const char *bindservice; 2620 char *cp; 2621 int error, maxs, *s, *socks; 2622 2623 /* 2624 * We have to handle this case for backwards compatibility: 2625 * If there are two (or more) colons but no '[' and ']', 2626 * assume this is an inet6 address without a service. 2627 */ 2628 bindservice = "syslog"; 2629 if (bindhostname != NULL) { 2630 #ifdef INET6 2631 if (*bindhostname == '[' && 2632 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2633 ++bindhostname; 2634 *cp = '\0'; 2635 if (cp[1] == ':' && cp[2] != '\0') 2636 bindservice = cp + 2; 2637 } else { 2638 #endif 2639 cp = strchr(bindhostname, ':'); 2640 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2641 *cp = '\0'; 2642 if (cp[1] != '\0') 2643 bindservice = cp + 1; 2644 if (cp == bindhostname) 2645 bindhostname = NULL; 2646 } 2647 #ifdef INET6 2648 } 2649 #endif 2650 } 2651 2652 memset(&hints, 0, sizeof(hints)); 2653 hints.ai_flags = AI_PASSIVE; 2654 hints.ai_family = af; 2655 hints.ai_socktype = SOCK_DGRAM; 2656 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2657 if (error) { 2658 logerror(gai_strerror(error)); 2659 errno = 0; 2660 die(0); 2661 } 2662 2663 /* Count max number of sockets we may open */ 2664 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2665 socks = malloc((maxs+1) * sizeof(int)); 2666 if (socks == NULL) { 2667 logerror("couldn't allocate memory for sockets"); 2668 die(0); 2669 } 2670 2671 *socks = 0; /* num of sockets counter at start of array */ 2672 s = socks + 1; 2673 for (r = res; r; r = r->ai_next) { 2674 int on = 1; 2675 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2676 if (*s < 0) { 2677 logerror("socket"); 2678 continue; 2679 } 2680 #ifdef INET6 2681 if (r->ai_family == AF_INET6) { 2682 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2683 (char *)&on, sizeof (on)) < 0) { 2684 logerror("setsockopt"); 2685 close(*s); 2686 continue; 2687 } 2688 } 2689 #endif 2690 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2691 (char *)&on, sizeof (on)) < 0) { 2692 logerror("setsockopt"); 2693 close(*s); 2694 continue; 2695 } 2696 /* 2697 * RFC 3164 recommends that client side message 2698 * should come from the privileged syslogd port. 2699 * 2700 * If the system administrator choose not to obey 2701 * this, we can skip the bind() step so that the 2702 * system will choose a port for us. 2703 */ 2704 if (!NoBind) { 2705 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2706 logerror("bind"); 2707 close(*s); 2708 continue; 2709 } 2710 2711 if (!SecureMode) 2712 increase_rcvbuf(*s); 2713 } 2714 2715 (*socks)++; 2716 s++; 2717 } 2718 2719 if (*socks == 0) { 2720 free(socks); 2721 if (Debug) 2722 return (NULL); 2723 else 2724 die(0); 2725 } 2726 if (res) 2727 freeaddrinfo(res); 2728 2729 return (socks); 2730 } 2731 2732 static void 2733 increase_rcvbuf(int fd) 2734 { 2735 socklen_t len, slen; 2736 2737 slen = sizeof(len); 2738 2739 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2740 if (len < RCVBUF_MINSIZE) { 2741 len = RCVBUF_MINSIZE; 2742 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2743 } 2744 } 2745 } 2746