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 ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 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 static void 773 readklog(void) 774 { 775 char *p, *q, line[MAXLINE + 1]; 776 int len, i; 777 778 len = 0; 779 for (;;) { 780 i = read(fklog, line + len, MAXLINE - 1 - len); 781 if (i > 0) { 782 line[i + len] = '\0'; 783 } else { 784 if (i < 0 && errno != EINTR && errno != EAGAIN) { 785 logerror("klog"); 786 fklog = -1; 787 } 788 break; 789 } 790 791 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 792 *q = '\0'; 793 printsys(p); 794 } 795 len = strlen(p); 796 if (len >= MAXLINE - 1) { 797 printsys(p); 798 len = 0; 799 } 800 if (len > 0) 801 memmove(line, p, len + 1); 802 } 803 if (len > 0) 804 printsys(line); 805 } 806 807 /* 808 * Take a raw input line from /dev/klog, format similar to syslog(). 809 */ 810 static void 811 printsys(char *msg) 812 { 813 char *p, *q; 814 long n; 815 int flags, isprintf, pri; 816 817 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 818 p = msg; 819 pri = DEFSPRI; 820 isprintf = 1; 821 if (*p == '<') { 822 errno = 0; 823 n = strtol(p + 1, &q, 10); 824 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 825 p = q + 1; 826 pri = n; 827 isprintf = 0; 828 } 829 } 830 /* 831 * Kernel printf's and LOG_CONSOLE messages have been displayed 832 * on the console already. 833 */ 834 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 835 flags |= IGN_CONS; 836 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 837 pri = DEFSPRI; 838 logmsg(pri, p, LocalHostName, flags); 839 } 840 841 static time_t now; 842 843 /* 844 * Match a program or host name against a specification. 845 * Return a non-0 value if the message must be ignored 846 * based on the specification. 847 */ 848 static int 849 skip_message(const char *name, const char *spec, int checkcase) 850 { 851 const char *s; 852 char prev, next; 853 int exclude = 0; 854 /* Behaviour on explicit match */ 855 856 if (spec == NULL) 857 return 0; 858 switch (*spec) { 859 case '-': 860 exclude = 1; 861 /*FALLTHROUGH*/ 862 case '+': 863 spec++; 864 break; 865 default: 866 break; 867 } 868 if (checkcase) 869 s = strstr (spec, name); 870 else 871 s = strcasestr (spec, name); 872 873 if (s != NULL) { 874 prev = (s == spec ? ',' : *(s - 1)); 875 next = *(s + strlen (name)); 876 877 if (prev == ',' && (next == '\0' || next == ',')) 878 /* Explicit match: skip iff the spec is an 879 exclusive one. */ 880 return exclude; 881 } 882 883 /* No explicit match for this name: skip the message iff 884 the spec is an inclusive one. */ 885 return !exclude; 886 } 887 888 /* 889 * Log a message to the appropriate log files, users, etc. based on 890 * the priority. 891 */ 892 static void 893 logmsg(int pri, const char *msg, const char *from, int flags) 894 { 895 struct filed *f; 896 int i, fac, msglen, omask, prilev; 897 const char *timestamp; 898 char prog[NAME_MAX+1]; 899 char buf[MAXLINE+1]; 900 901 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 902 pri, flags, from, msg); 903 904 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 905 906 /* 907 * Check to see if msg looks non-standard. 908 */ 909 msglen = strlen(msg); 910 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 911 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 912 flags |= ADDDATE; 913 914 (void)time(&now); 915 if (flags & ADDDATE) { 916 timestamp = ctime(&now) + 4; 917 } else { 918 timestamp = msg; 919 msg += 16; 920 msglen -= 16; 921 } 922 923 /* skip leading blanks */ 924 while (isspace(*msg)) { 925 msg++; 926 msglen--; 927 } 928 929 /* extract facility and priority level */ 930 if (flags & MARK) 931 fac = LOG_NFACILITIES; 932 else 933 fac = LOG_FAC(pri); 934 935 /* Check maximum facility number. */ 936 if (fac > LOG_NFACILITIES) { 937 (void)sigsetmask(omask); 938 return; 939 } 940 941 prilev = LOG_PRI(pri); 942 943 /* extract program name */ 944 for (i = 0; i < NAME_MAX; i++) { 945 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 946 msg[i] == '/' || isspace(msg[i])) 947 break; 948 prog[i] = msg[i]; 949 } 950 prog[i] = 0; 951 952 /* add kernel prefix for kernel messages */ 953 if (flags & ISKERNEL) { 954 snprintf(buf, sizeof(buf), "%s: %s", 955 use_bootfile ? bootfile : "kernel", msg); 956 msg = buf; 957 msglen = strlen(buf); 958 } 959 960 /* log the message to the particular outputs */ 961 if (!Initialized) { 962 f = &consfile; 963 /* 964 * Open in non-blocking mode to avoid hangs during open 965 * and close(waiting for the port to drain). 966 */ 967 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 968 969 if (f->f_file >= 0) { 970 (void)strlcpy(f->f_lasttime, timestamp, 971 sizeof(f->f_lasttime)); 972 fprintlog(f, flags, msg); 973 (void)close(f->f_file); 974 } 975 (void)sigsetmask(omask); 976 return; 977 } 978 for (f = Files; f; f = f->f_next) { 979 /* skip messages that are incorrect priority */ 980 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 981 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 982 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 983 ) 984 || f->f_pmask[fac] == INTERNAL_NOPRI) 985 continue; 986 987 /* skip messages with the incorrect hostname */ 988 if (skip_message(from, f->f_host, 0)) 989 continue; 990 991 /* skip messages with the incorrect program name */ 992 if (skip_message(prog, f->f_program, 1)) 993 continue; 994 995 /* skip message to console if it has already been printed */ 996 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 997 continue; 998 999 /* don't output marks to recently written files */ 1000 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1001 continue; 1002 1003 /* 1004 * suppress duplicate lines to this file 1005 */ 1006 if (no_compress - (f->f_type != F_PIPE) < 1 && 1007 (flags & MARK) == 0 && msglen == f->f_prevlen && 1008 f->f_prevline && !strcmp(msg, f->f_prevline) && 1009 !strcasecmp(from, f->f_prevhost)) { 1010 (void)strlcpy(f->f_lasttime, timestamp, 1011 sizeof(f->f_lasttime)); 1012 f->f_prevcount++; 1013 dprintf("msg repeated %d times, %ld sec of %d\n", 1014 f->f_prevcount, (long)(now - f->f_time), 1015 repeatinterval[f->f_repeatcount]); 1016 /* 1017 * If domark would have logged this by now, 1018 * flush it now (so we don't hold isolated messages), 1019 * but back off so we'll flush less often 1020 * in the future. 1021 */ 1022 if (now > REPEATTIME(f)) { 1023 fprintlog(f, flags, NULL); 1024 BACKOFF(f); 1025 } 1026 } else { 1027 /* new line, save it */ 1028 if (f->f_prevcount) 1029 fprintlog(f, 0, NULL); 1030 f->f_repeatcount = 0; 1031 f->f_prevpri = pri; 1032 (void)strlcpy(f->f_lasttime, timestamp, 1033 sizeof(f->f_lasttime)); 1034 (void)strlcpy(f->f_prevhost, from, 1035 sizeof(f->f_prevhost)); 1036 if (msglen < MAXSVLINE) { 1037 f->f_prevlen = msglen; 1038 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1039 fprintlog(f, flags, NULL); 1040 } else { 1041 f->f_prevline[0] = 0; 1042 f->f_prevlen = 0; 1043 fprintlog(f, flags, msg); 1044 } 1045 } 1046 } 1047 (void)sigsetmask(omask); 1048 } 1049 1050 static void 1051 dofsync(void) 1052 { 1053 struct filed *f; 1054 1055 for (f = Files; f; f = f->f_next) { 1056 if ((f->f_type == F_FILE) && 1057 (f->f_flags & FFLAG_NEEDSYNC)) { 1058 f->f_flags &= ~FFLAG_NEEDSYNC; 1059 (void)fsync(f->f_file); 1060 } 1061 } 1062 } 1063 1064 #define IOV_SIZE 7 1065 static void 1066 fprintlog(struct filed *f, int flags, const char *msg) 1067 { 1068 struct iovec iov[IOV_SIZE]; 1069 struct iovec *v; 1070 struct addrinfo *r; 1071 int i, l, lsent = 0; 1072 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1073 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1074 const char *msgret; 1075 1076 v = iov; 1077 if (f->f_type == F_WALL) { 1078 v->iov_base = greetings; 1079 /* The time displayed is not synchornized with the other log 1080 * destinations (like messages). Following fragment was using 1081 * ctime(&now), which was updating the time every 30 sec. 1082 * With f_lasttime, time is synchronized correctly. 1083 */ 1084 v->iov_len = snprintf(greetings, sizeof greetings, 1085 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1086 f->f_prevhost, f->f_lasttime); 1087 if (v->iov_len >= sizeof greetings) 1088 v->iov_len = sizeof greetings - 1; 1089 v++; 1090 v->iov_base = nul; 1091 v->iov_len = 0; 1092 v++; 1093 } else { 1094 v->iov_base = f->f_lasttime; 1095 v->iov_len = strlen(f->f_lasttime); 1096 v++; 1097 v->iov_base = space; 1098 v->iov_len = 1; 1099 v++; 1100 } 1101 1102 if (LogFacPri) { 1103 static char fp_buf[30]; /* Hollow laugh */ 1104 int fac = f->f_prevpri & LOG_FACMASK; 1105 int pri = LOG_PRI(f->f_prevpri); 1106 const char *f_s = NULL; 1107 char f_n[5]; /* Hollow laugh */ 1108 const char *p_s = NULL; 1109 char p_n[5]; /* Hollow laugh */ 1110 1111 if (LogFacPri > 1) { 1112 const CODE *c; 1113 1114 for (c = facilitynames; c->c_name; c++) { 1115 if (c->c_val == fac) { 1116 f_s = c->c_name; 1117 break; 1118 } 1119 } 1120 for (c = prioritynames; c->c_name; c++) { 1121 if (c->c_val == pri) { 1122 p_s = c->c_name; 1123 break; 1124 } 1125 } 1126 } 1127 if (!f_s) { 1128 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1129 f_s = f_n; 1130 } 1131 if (!p_s) { 1132 snprintf(p_n, sizeof p_n, "%d", pri); 1133 p_s = p_n; 1134 } 1135 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1136 v->iov_base = fp_buf; 1137 v->iov_len = strlen(fp_buf); 1138 } else { 1139 v->iov_base = nul; 1140 v->iov_len = 0; 1141 } 1142 v++; 1143 1144 v->iov_base = f->f_prevhost; 1145 v->iov_len = strlen(v->iov_base); 1146 v++; 1147 v->iov_base = space; 1148 v->iov_len = 1; 1149 v++; 1150 1151 if (msg) { 1152 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1153 if (wmsg == NULL) { 1154 logerror("strdup"); 1155 exit(1); 1156 } 1157 v->iov_base = wmsg; 1158 v->iov_len = strlen(msg); 1159 } else if (f->f_prevcount > 1) { 1160 v->iov_base = repbuf; 1161 v->iov_len = snprintf(repbuf, sizeof repbuf, 1162 "last message repeated %d times", f->f_prevcount); 1163 } else if (f->f_prevline) { 1164 v->iov_base = f->f_prevline; 1165 v->iov_len = f->f_prevlen; 1166 } else { 1167 return; 1168 } 1169 v++; 1170 1171 dprintf("Logging to %s", TypeNames[f->f_type]); 1172 f->f_time = now; 1173 1174 switch (f->f_type) { 1175 int port; 1176 case F_UNUSED: 1177 dprintf("\n"); 1178 break; 1179 1180 case F_FORW: 1181 port = (int)ntohs(((struct sockaddr_in *) 1182 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1183 if (port != 514) { 1184 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1185 } else { 1186 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1187 } 1188 /* check for local vs remote messages */ 1189 if (strcasecmp(f->f_prevhost, LocalHostName)) 1190 l = snprintf(line, sizeof line - 1, 1191 "<%d>%.15s Forwarded from %s: %s", 1192 f->f_prevpri, (char *)iov[0].iov_base, 1193 f->f_prevhost, (char *)iov[5].iov_base); 1194 else 1195 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1196 f->f_prevpri, (char *)iov[0].iov_base, 1197 (char *)iov[5].iov_base); 1198 if (l < 0) 1199 l = 0; 1200 else if (l > MAXLINE) 1201 l = MAXLINE; 1202 1203 if (finet) { 1204 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1205 for (i = 0; i < *finet; i++) { 1206 #if 0 1207 /* 1208 * should we check AF first, or just 1209 * trial and error? FWD 1210 */ 1211 if (r->ai_family == 1212 address_family_of(finet[i+1])) 1213 #endif 1214 lsent = sendto(finet[i+1], line, l, 0, 1215 r->ai_addr, r->ai_addrlen); 1216 if (lsent == l) 1217 break; 1218 } 1219 if (lsent == l && !send_to_all) 1220 break; 1221 } 1222 dprintf("lsent/l: %d/%d\n", lsent, l); 1223 if (lsent != l) { 1224 int e = errno; 1225 logerror("sendto"); 1226 errno = e; 1227 switch (errno) { 1228 case ENOBUFS: 1229 case ENETDOWN: 1230 case ENETUNREACH: 1231 case EHOSTUNREACH: 1232 case EHOSTDOWN: 1233 case EADDRNOTAVAIL: 1234 break; 1235 /* case EBADF: */ 1236 /* case EACCES: */ 1237 /* case ENOTSOCK: */ 1238 /* case EFAULT: */ 1239 /* case EMSGSIZE: */ 1240 /* case EAGAIN: */ 1241 /* case ENOBUFS: */ 1242 /* case ECONNREFUSED: */ 1243 default: 1244 dprintf("removing entry: errno=%d\n", e); 1245 f->f_type = F_UNUSED; 1246 break; 1247 } 1248 } 1249 } 1250 break; 1251 1252 case F_FILE: 1253 dprintf(" %s\n", f->f_un.f_fname); 1254 v->iov_base = lf; 1255 v->iov_len = 1; 1256 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1257 /* 1258 * If writev(2) fails for potentially transient errors 1259 * like the filesystem being full, ignore it. 1260 * Otherwise remove this logfile from the list. 1261 */ 1262 if (errno != ENOSPC) { 1263 int e = errno; 1264 (void)close(f->f_file); 1265 f->f_type = F_UNUSED; 1266 errno = e; 1267 logerror(f->f_un.f_fname); 1268 } 1269 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1270 f->f_flags |= FFLAG_NEEDSYNC; 1271 needdofsync = 1; 1272 } 1273 break; 1274 1275 case F_PIPE: 1276 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1277 v->iov_base = lf; 1278 v->iov_len = 1; 1279 if (f->f_un.f_pipe.f_pid == 0) { 1280 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1281 &f->f_un.f_pipe.f_pid)) < 0) { 1282 f->f_type = F_UNUSED; 1283 logerror(f->f_un.f_pipe.f_pname); 1284 break; 1285 } 1286 } 1287 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1288 int e = errno; 1289 (void)close(f->f_file); 1290 if (f->f_un.f_pipe.f_pid > 0) 1291 deadq_enter(f->f_un.f_pipe.f_pid, 1292 f->f_un.f_pipe.f_pname); 1293 f->f_un.f_pipe.f_pid = 0; 1294 errno = e; 1295 logerror(f->f_un.f_pipe.f_pname); 1296 } 1297 break; 1298 1299 case F_CONSOLE: 1300 if (flags & IGN_CONS) { 1301 dprintf(" (ignored)\n"); 1302 break; 1303 } 1304 /* FALLTHROUGH */ 1305 1306 case F_TTY: 1307 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1308 v->iov_base = crlf; 1309 v->iov_len = 2; 1310 1311 errno = 0; /* ttymsg() only sometimes returns an errno */ 1312 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1313 f->f_type = F_UNUSED; 1314 logerror(msgret); 1315 } 1316 break; 1317 1318 case F_USERS: 1319 case F_WALL: 1320 dprintf("\n"); 1321 v->iov_base = crlf; 1322 v->iov_len = 2; 1323 wallmsg(f, iov, IOV_SIZE); 1324 break; 1325 } 1326 f->f_prevcount = 0; 1327 free(wmsg); 1328 } 1329 1330 /* 1331 * WALLMSG -- Write a message to the world at large 1332 * 1333 * Write the specified message to either the entire 1334 * world, or a list of approved users. 1335 */ 1336 static void 1337 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1338 { 1339 static int reenter; /* avoid calling ourselves */ 1340 struct utmpx *ut; 1341 int i; 1342 const char *p; 1343 1344 if (reenter++) 1345 return; 1346 setutxent(); 1347 /* NOSTRICT */ 1348 while ((ut = getutxent()) != NULL) { 1349 if (ut->ut_type != USER_PROCESS) 1350 continue; 1351 if (f->f_type == F_WALL) { 1352 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1353 TTYMSGTIME)) != NULL) { 1354 errno = 0; /* already in msg */ 1355 logerror(p); 1356 } 1357 continue; 1358 } 1359 /* should we send the message to this user? */ 1360 for (i = 0; i < MAXUNAMES; i++) { 1361 if (!f->f_un.f_uname[i][0]) 1362 break; 1363 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1364 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1365 TTYMSGTIME)) != NULL) { 1366 errno = 0; /* already in msg */ 1367 logerror(p); 1368 } 1369 break; 1370 } 1371 } 1372 } 1373 endutxent(); 1374 reenter = 0; 1375 } 1376 1377 static void 1378 reapchild(int signo __unused) 1379 { 1380 int status; 1381 pid_t pid; 1382 struct filed *f; 1383 1384 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1385 if (!Initialized) 1386 /* Don't tell while we are initting. */ 1387 continue; 1388 1389 /* First, look if it's a process from the dead queue. */ 1390 if (deadq_remove(pid)) 1391 goto oncemore; 1392 1393 /* Now, look in list of active processes. */ 1394 for (f = Files; f; f = f->f_next) 1395 if (f->f_type == F_PIPE && 1396 f->f_un.f_pipe.f_pid == pid) { 1397 (void)close(f->f_file); 1398 f->f_un.f_pipe.f_pid = 0; 1399 log_deadchild(pid, status, 1400 f->f_un.f_pipe.f_pname); 1401 break; 1402 } 1403 oncemore: 1404 continue; 1405 } 1406 } 1407 1408 /* 1409 * Return a printable representation of a host address. 1410 */ 1411 static const char * 1412 cvthname(struct sockaddr *f) 1413 { 1414 int error, hl; 1415 sigset_t omask, nmask; 1416 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1417 1418 error = getnameinfo((struct sockaddr *)f, 1419 ((struct sockaddr *)f)->sa_len, 1420 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1421 dprintf("cvthname(%s)\n", ip); 1422 1423 if (error) { 1424 dprintf("Malformed from address %s\n", gai_strerror(error)); 1425 return ("???"); 1426 } 1427 if (!resolve) 1428 return (ip); 1429 1430 sigemptyset(&nmask); 1431 sigaddset(&nmask, SIGHUP); 1432 sigprocmask(SIG_BLOCK, &nmask, &omask); 1433 error = getnameinfo((struct sockaddr *)f, 1434 ((struct sockaddr *)f)->sa_len, 1435 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1436 sigprocmask(SIG_SETMASK, &omask, NULL); 1437 if (error) { 1438 dprintf("Host name for your address (%s) unknown\n", ip); 1439 return (ip); 1440 } 1441 hl = strlen(hname); 1442 if (hl > 0 && hname[hl-1] == '.') 1443 hname[--hl] = '\0'; 1444 trimdomain(hname, hl); 1445 return (hname); 1446 } 1447 1448 static void 1449 dodie(int signo) 1450 { 1451 1452 WantDie = signo; 1453 } 1454 1455 static void 1456 domark(int signo __unused) 1457 { 1458 1459 MarkSet = 1; 1460 } 1461 1462 /* 1463 * Print syslogd errors some place. 1464 */ 1465 static void 1466 logerror(const char *type) 1467 { 1468 char buf[512]; 1469 static int recursed = 0; 1470 1471 /* If there's an error while trying to log an error, give up. */ 1472 if (recursed) 1473 return; 1474 recursed++; 1475 if (errno) 1476 (void)snprintf(buf, 1477 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1478 else 1479 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1480 errno = 0; 1481 dprintf("%s\n", buf); 1482 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1483 recursed--; 1484 } 1485 1486 static void 1487 die(int signo) 1488 { 1489 struct filed *f; 1490 struct funix *fx; 1491 int was_initialized; 1492 char buf[100]; 1493 1494 was_initialized = Initialized; 1495 Initialized = 0; /* Don't log SIGCHLDs. */ 1496 for (f = Files; f != NULL; f = f->f_next) { 1497 /* flush any pending output */ 1498 if (f->f_prevcount) 1499 fprintlog(f, 0, (char *)NULL); 1500 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1501 (void)close(f->f_file); 1502 f->f_un.f_pipe.f_pid = 0; 1503 } 1504 } 1505 Initialized = was_initialized; 1506 if (signo) { 1507 dprintf("syslogd: exiting on signal %d\n", signo); 1508 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1509 errno = 0; 1510 logerror(buf); 1511 } 1512 STAILQ_FOREACH(fx, &funixes, next) 1513 (void)unlink(fx->name); 1514 pidfile_remove(pfh); 1515 1516 exit(1); 1517 } 1518 1519 /* 1520 * INIT -- Initialize syslogd from configuration table 1521 */ 1522 static void 1523 init(int signo) 1524 { 1525 int i; 1526 FILE *cf; 1527 struct filed *f, *next, **nextp; 1528 char *p; 1529 char cline[LINE_MAX]; 1530 char prog[NAME_MAX+1]; 1531 char host[MAXHOSTNAMELEN]; 1532 char oldLocalHostName[MAXHOSTNAMELEN]; 1533 char hostMsg[2*MAXHOSTNAMELEN+40]; 1534 char bootfileMsg[LINE_MAX]; 1535 1536 dprintf("init\n"); 1537 1538 /* 1539 * Load hostname (may have changed). 1540 */ 1541 if (signo != 0) 1542 (void)strlcpy(oldLocalHostName, LocalHostName, 1543 sizeof(oldLocalHostName)); 1544 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1545 err(EX_OSERR, "gethostname() failed"); 1546 if ((p = strchr(LocalHostName, '.')) != NULL) { 1547 *p++ = '\0'; 1548 LocalDomain = p; 1549 } else { 1550 LocalDomain = ""; 1551 } 1552 1553 /* 1554 * Close all open log files. 1555 */ 1556 Initialized = 0; 1557 for (f = Files; f != NULL; f = next) { 1558 /* flush any pending output */ 1559 if (f->f_prevcount) 1560 fprintlog(f, 0, NULL); 1561 1562 switch (f->f_type) { 1563 case F_FILE: 1564 case F_FORW: 1565 case F_CONSOLE: 1566 case F_TTY: 1567 (void)close(f->f_file); 1568 break; 1569 case F_PIPE: 1570 if (f->f_un.f_pipe.f_pid > 0) { 1571 (void)close(f->f_file); 1572 deadq_enter(f->f_un.f_pipe.f_pid, 1573 f->f_un.f_pipe.f_pname); 1574 } 1575 f->f_un.f_pipe.f_pid = 0; 1576 break; 1577 } 1578 next = f->f_next; 1579 if (f->f_program) free(f->f_program); 1580 if (f->f_host) free(f->f_host); 1581 free((char *)f); 1582 } 1583 Files = NULL; 1584 nextp = &Files; 1585 1586 /* open the configuration file */ 1587 if ((cf = fopen(ConfFile, "r")) == NULL) { 1588 dprintf("cannot open %s\n", ConfFile); 1589 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1590 if (*nextp == NULL) { 1591 logerror("calloc"); 1592 exit(1); 1593 } 1594 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1595 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1596 if ((*nextp)->f_next == NULL) { 1597 logerror("calloc"); 1598 exit(1); 1599 } 1600 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1601 Initialized = 1; 1602 return; 1603 } 1604 1605 /* 1606 * Foreach line in the conf table, open that file. 1607 */ 1608 f = NULL; 1609 (void)strlcpy(host, "*", sizeof(host)); 1610 (void)strlcpy(prog, "*", sizeof(prog)); 1611 while (fgets(cline, sizeof(cline), cf) != NULL) { 1612 /* 1613 * check for end-of-section, comments, strip off trailing 1614 * spaces and newline character. #!prog is treated specially: 1615 * following lines apply only to that program. 1616 */ 1617 for (p = cline; isspace(*p); ++p) 1618 continue; 1619 if (*p == 0) 1620 continue; 1621 if (*p == '#') { 1622 p++; 1623 if (*p != '!' && *p != '+' && *p != '-') 1624 continue; 1625 } 1626 if (*p == '+' || *p == '-') { 1627 host[0] = *p++; 1628 while (isspace(*p)) 1629 p++; 1630 if ((!*p) || (*p == '*')) { 1631 (void)strlcpy(host, "*", sizeof(host)); 1632 continue; 1633 } 1634 if (*p == '@') 1635 p = LocalHostName; 1636 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1637 if (!isalnum(*p) && *p != '.' && *p != '-' 1638 && *p != ',' && *p != ':' && *p != '%') 1639 break; 1640 host[i] = *p++; 1641 } 1642 host[i] = '\0'; 1643 continue; 1644 } 1645 if (*p == '!') { 1646 p++; 1647 while (isspace(*p)) p++; 1648 if ((!*p) || (*p == '*')) { 1649 (void)strlcpy(prog, "*", sizeof(prog)); 1650 continue; 1651 } 1652 for (i = 0; i < NAME_MAX; i++) { 1653 if (!isprint(p[i]) || isspace(p[i])) 1654 break; 1655 prog[i] = p[i]; 1656 } 1657 prog[i] = 0; 1658 continue; 1659 } 1660 for (p = cline + 1; *p != '\0'; p++) { 1661 if (*p != '#') 1662 continue; 1663 if (*(p - 1) == '\\') { 1664 strcpy(p - 1, p); 1665 p--; 1666 continue; 1667 } 1668 *p = '\0'; 1669 break; 1670 } 1671 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1672 cline[i] = '\0'; 1673 f = (struct filed *)calloc(1, sizeof(*f)); 1674 if (f == NULL) { 1675 logerror("calloc"); 1676 exit(1); 1677 } 1678 *nextp = f; 1679 nextp = &f->f_next; 1680 cfline(cline, f, prog, host); 1681 } 1682 1683 /* close the configuration file */ 1684 (void)fclose(cf); 1685 1686 Initialized = 1; 1687 1688 if (Debug) { 1689 int port; 1690 for (f = Files; f; f = f->f_next) { 1691 for (i = 0; i <= LOG_NFACILITIES; i++) 1692 if (f->f_pmask[i] == INTERNAL_NOPRI) 1693 printf("X "); 1694 else 1695 printf("%d ", f->f_pmask[i]); 1696 printf("%s: ", TypeNames[f->f_type]); 1697 switch (f->f_type) { 1698 case F_FILE: 1699 printf("%s", f->f_un.f_fname); 1700 break; 1701 1702 case F_CONSOLE: 1703 case F_TTY: 1704 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1705 break; 1706 1707 case F_FORW: 1708 port = (int)ntohs(((struct sockaddr_in *) 1709 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1710 if (port != 514) { 1711 printf("%s:%d", 1712 f->f_un.f_forw.f_hname, port); 1713 } else { 1714 printf("%s", f->f_un.f_forw.f_hname); 1715 } 1716 break; 1717 1718 case F_PIPE: 1719 printf("%s", f->f_un.f_pipe.f_pname); 1720 break; 1721 1722 case F_USERS: 1723 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1724 printf("%s, ", f->f_un.f_uname[i]); 1725 break; 1726 } 1727 if (f->f_program) 1728 printf(" (%s)", f->f_program); 1729 printf("\n"); 1730 } 1731 } 1732 1733 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1734 dprintf("syslogd: restarted\n"); 1735 /* 1736 * Log a change in hostname, but only on a restart. 1737 */ 1738 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1739 (void)snprintf(hostMsg, sizeof(hostMsg), 1740 "syslogd: hostname changed, \"%s\" to \"%s\"", 1741 oldLocalHostName, LocalHostName); 1742 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1743 dprintf("%s\n", hostMsg); 1744 } 1745 /* 1746 * Log the kernel boot file if we aren't going to use it as 1747 * the prefix, and if this is *not* a restart. 1748 */ 1749 if (signo == 0 && !use_bootfile) { 1750 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1751 "syslogd: kernel boot file is %s", bootfile); 1752 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1753 dprintf("%s\n", bootfileMsg); 1754 } 1755 } 1756 1757 /* 1758 * Crack a configuration file line 1759 */ 1760 static void 1761 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1762 { 1763 struct addrinfo hints, *res; 1764 int error, i, pri, syncfile; 1765 const char *p, *q; 1766 char *bp; 1767 char buf[MAXLINE], ebuf[100]; 1768 1769 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1770 1771 errno = 0; /* keep strerror() stuff out of logerror messages */ 1772 1773 /* clear out file entry */ 1774 memset(f, 0, sizeof(*f)); 1775 for (i = 0; i <= LOG_NFACILITIES; i++) 1776 f->f_pmask[i] = INTERNAL_NOPRI; 1777 1778 /* save hostname if any */ 1779 if (host && *host == '*') 1780 host = NULL; 1781 if (host) { 1782 int hl; 1783 1784 f->f_host = strdup(host); 1785 if (f->f_host == NULL) { 1786 logerror("strdup"); 1787 exit(1); 1788 } 1789 hl = strlen(f->f_host); 1790 if (hl > 0 && f->f_host[hl-1] == '.') 1791 f->f_host[--hl] = '\0'; 1792 trimdomain(f->f_host, hl); 1793 } 1794 1795 /* save program name if any */ 1796 if (prog && *prog == '*') 1797 prog = NULL; 1798 if (prog) { 1799 f->f_program = strdup(prog); 1800 if (f->f_program == NULL) { 1801 logerror("strdup"); 1802 exit(1); 1803 } 1804 } 1805 1806 /* scan through the list of selectors */ 1807 for (p = line; *p && *p != '\t' && *p != ' ';) { 1808 int pri_done; 1809 int pri_cmp; 1810 int pri_invert; 1811 1812 /* find the end of this facility name list */ 1813 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1814 continue; 1815 1816 /* get the priority comparison */ 1817 pri_cmp = 0; 1818 pri_done = 0; 1819 pri_invert = 0; 1820 if (*q == '!') { 1821 pri_invert = 1; 1822 q++; 1823 } 1824 while (!pri_done) { 1825 switch (*q) { 1826 case '<': 1827 pri_cmp |= PRI_LT; 1828 q++; 1829 break; 1830 case '=': 1831 pri_cmp |= PRI_EQ; 1832 q++; 1833 break; 1834 case '>': 1835 pri_cmp |= PRI_GT; 1836 q++; 1837 break; 1838 default: 1839 pri_done++; 1840 break; 1841 } 1842 } 1843 1844 /* collect priority name */ 1845 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1846 *bp++ = *q++; 1847 *bp = '\0'; 1848 1849 /* skip cruft */ 1850 while (strchr(",;", *q)) 1851 q++; 1852 1853 /* decode priority name */ 1854 if (*buf == '*') { 1855 pri = LOG_PRIMASK; 1856 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1857 } else { 1858 /* Ignore trailing spaces. */ 1859 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1860 buf[i] = '\0'; 1861 1862 pri = decode(buf, prioritynames); 1863 if (pri < 0) { 1864 errno = 0; 1865 (void)snprintf(ebuf, sizeof ebuf, 1866 "unknown priority name \"%s\"", buf); 1867 logerror(ebuf); 1868 return; 1869 } 1870 } 1871 if (!pri_cmp) 1872 pri_cmp = (UniquePriority) 1873 ? (PRI_EQ) 1874 : (PRI_EQ | PRI_GT) 1875 ; 1876 if (pri_invert) 1877 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1878 1879 /* scan facilities */ 1880 while (*p && !strchr("\t.; ", *p)) { 1881 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1882 *bp++ = *p++; 1883 *bp = '\0'; 1884 1885 if (*buf == '*') { 1886 for (i = 0; i < LOG_NFACILITIES; i++) { 1887 f->f_pmask[i] = pri; 1888 f->f_pcmp[i] = pri_cmp; 1889 } 1890 } else { 1891 i = decode(buf, facilitynames); 1892 if (i < 0) { 1893 errno = 0; 1894 (void)snprintf(ebuf, sizeof ebuf, 1895 "unknown facility name \"%s\"", 1896 buf); 1897 logerror(ebuf); 1898 return; 1899 } 1900 f->f_pmask[i >> 3] = pri; 1901 f->f_pcmp[i >> 3] = pri_cmp; 1902 } 1903 while (*p == ',' || *p == ' ') 1904 p++; 1905 } 1906 1907 p = q; 1908 } 1909 1910 /* skip to action part */ 1911 while (*p == '\t' || *p == ' ') 1912 p++; 1913 1914 if (*p == '-') { 1915 syncfile = 0; 1916 p++; 1917 } else 1918 syncfile = 1; 1919 1920 switch (*p) { 1921 case '@': 1922 { 1923 char *tp; 1924 char endkey = ':'; 1925 /* 1926 * scan forward to see if there is a port defined. 1927 * so we can't use strlcpy.. 1928 */ 1929 i = sizeof(f->f_un.f_forw.f_hname); 1930 tp = f->f_un.f_forw.f_hname; 1931 p++; 1932 1933 /* 1934 * an ipv6 address should start with a '[' in that case 1935 * we should scan for a ']' 1936 */ 1937 if (*p == '[') { 1938 p++; 1939 endkey = ']'; 1940 } 1941 while (*p && (*p != endkey) && (i-- > 0)) { 1942 *tp++ = *p++; 1943 } 1944 if (endkey == ']' && *p == endkey) 1945 p++; 1946 *tp = '\0'; 1947 } 1948 /* See if we copied a domain and have a port */ 1949 if (*p == ':') 1950 p++; 1951 else 1952 p = NULL; 1953 1954 memset(&hints, 0, sizeof(hints)); 1955 hints.ai_family = family; 1956 hints.ai_socktype = SOCK_DGRAM; 1957 error = getaddrinfo(f->f_un.f_forw.f_hname, 1958 p ? p : "syslog", &hints, &res); 1959 if (error) { 1960 logerror(gai_strerror(error)); 1961 break; 1962 } 1963 f->f_un.f_forw.f_addr = res; 1964 f->f_type = F_FORW; 1965 break; 1966 1967 case '/': 1968 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1969 f->f_type = F_UNUSED; 1970 logerror(p); 1971 break; 1972 } 1973 if (syncfile) 1974 f->f_flags |= FFLAG_SYNC; 1975 if (isatty(f->f_file)) { 1976 if (strcmp(p, ctty) == 0) 1977 f->f_type = F_CONSOLE; 1978 else 1979 f->f_type = F_TTY; 1980 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1981 sizeof(f->f_un.f_fname)); 1982 } else { 1983 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1984 f->f_type = F_FILE; 1985 } 1986 break; 1987 1988 case '|': 1989 f->f_un.f_pipe.f_pid = 0; 1990 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 1991 sizeof(f->f_un.f_pipe.f_pname)); 1992 f->f_type = F_PIPE; 1993 break; 1994 1995 case '*': 1996 f->f_type = F_WALL; 1997 break; 1998 1999 default: 2000 for (i = 0; i < MAXUNAMES && *p; i++) { 2001 for (q = p; *q && *q != ','; ) 2002 q++; 2003 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2004 if ((q - p) >= MAXLOGNAME) 2005 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2006 else 2007 f->f_un.f_uname[i][q - p] = '\0'; 2008 while (*q == ',' || *q == ' ') 2009 q++; 2010 p = q; 2011 } 2012 f->f_type = F_USERS; 2013 break; 2014 } 2015 } 2016 2017 2018 /* 2019 * Decode a symbolic name to a numeric value 2020 */ 2021 static int 2022 decode(const char *name, const CODE *codetab) 2023 { 2024 const CODE *c; 2025 char *p, buf[40]; 2026 2027 if (isdigit(*name)) 2028 return (atoi(name)); 2029 2030 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2031 if (isupper(*name)) 2032 *p = tolower(*name); 2033 else 2034 *p = *name; 2035 } 2036 *p = '\0'; 2037 for (c = codetab; c->c_name; c++) 2038 if (!strcmp(buf, c->c_name)) 2039 return (c->c_val); 2040 2041 return (-1); 2042 } 2043 2044 static void 2045 markit(void) 2046 { 2047 struct filed *f; 2048 dq_t q, next; 2049 2050 now = time(NULL); 2051 MarkSeq += TIMERINTVL; 2052 if (MarkSeq >= MarkInterval) { 2053 logmsg(LOG_INFO, "-- MARK --", 2054 LocalHostName, ADDDATE|MARK); 2055 MarkSeq = 0; 2056 } 2057 2058 for (f = Files; f; f = f->f_next) { 2059 if (f->f_prevcount && now >= REPEATTIME(f)) { 2060 dprintf("flush %s: repeated %d times, %d sec.\n", 2061 TypeNames[f->f_type], f->f_prevcount, 2062 repeatinterval[f->f_repeatcount]); 2063 fprintlog(f, 0, NULL); 2064 BACKOFF(f); 2065 } 2066 } 2067 2068 /* Walk the dead queue, and see if we should signal somebody. */ 2069 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2070 next = TAILQ_NEXT(q, dq_entries); 2071 2072 switch (q->dq_timeout) { 2073 case 0: 2074 /* Already signalled once, try harder now. */ 2075 if (kill(q->dq_pid, SIGKILL) != 0) 2076 (void)deadq_remove(q->dq_pid); 2077 break; 2078 2079 case 1: 2080 /* 2081 * Timed out on dead queue, send terminate 2082 * signal. Note that we leave the removal 2083 * from the dead queue to reapchild(), which 2084 * will also log the event (unless the process 2085 * didn't even really exist, in case we simply 2086 * drop it from the dead queue). 2087 */ 2088 if (kill(q->dq_pid, SIGTERM) != 0) 2089 (void)deadq_remove(q->dq_pid); 2090 /* FALLTHROUGH */ 2091 2092 default: 2093 q->dq_timeout--; 2094 } 2095 } 2096 MarkSet = 0; 2097 (void)alarm(TIMERINTVL); 2098 } 2099 2100 /* 2101 * fork off and become a daemon, but wait for the child to come online 2102 * before returing to the parent, or we get disk thrashing at boot etc. 2103 * Set a timer so we don't hang forever if it wedges. 2104 */ 2105 static int 2106 waitdaemon(int nochdir, int noclose, int maxwait) 2107 { 2108 int fd; 2109 int status; 2110 pid_t pid, childpid; 2111 2112 switch (childpid = fork()) { 2113 case -1: 2114 return (-1); 2115 case 0: 2116 break; 2117 default: 2118 signal(SIGALRM, timedout); 2119 alarm(maxwait); 2120 while ((pid = wait3(&status, 0, NULL)) != -1) { 2121 if (WIFEXITED(status)) 2122 errx(1, "child pid %d exited with return code %d", 2123 pid, WEXITSTATUS(status)); 2124 if (WIFSIGNALED(status)) 2125 errx(1, "child pid %d exited on signal %d%s", 2126 pid, WTERMSIG(status), 2127 WCOREDUMP(status) ? " (core dumped)" : 2128 ""); 2129 if (pid == childpid) /* it's gone... */ 2130 break; 2131 } 2132 exit(0); 2133 } 2134 2135 if (setsid() == -1) 2136 return (-1); 2137 2138 if (!nochdir) 2139 (void)chdir("/"); 2140 2141 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2142 (void)dup2(fd, STDIN_FILENO); 2143 (void)dup2(fd, STDOUT_FILENO); 2144 (void)dup2(fd, STDERR_FILENO); 2145 if (fd > 2) 2146 (void)close (fd); 2147 } 2148 return (getppid()); 2149 } 2150 2151 /* 2152 * We get a SIGALRM from the child when it's running and finished doing it's 2153 * fsync()'s or O_SYNC writes for all the boot messages. 2154 * 2155 * We also get a signal from the kernel if the timer expires, so check to 2156 * see what happened. 2157 */ 2158 static void 2159 timedout(int sig __unused) 2160 { 2161 int left; 2162 left = alarm(0); 2163 signal(SIGALRM, SIG_DFL); 2164 if (left == 0) 2165 errx(1, "timed out waiting for child"); 2166 else 2167 _exit(0); 2168 } 2169 2170 /* 2171 * Add `s' to the list of allowable peer addresses to accept messages 2172 * from. 2173 * 2174 * `s' is a string in the form: 2175 * 2176 * [*]domainname[:{servicename|portnumber|*}] 2177 * 2178 * or 2179 * 2180 * netaddr/maskbits[:{servicename|portnumber|*}] 2181 * 2182 * Returns -1 on error, 0 if the argument was valid. 2183 */ 2184 static int 2185 allowaddr(char *s) 2186 { 2187 char *cp1, *cp2; 2188 struct allowedpeer ap; 2189 struct servent *se; 2190 int masklen = -1; 2191 struct addrinfo hints, *res; 2192 struct in_addr *addrp, *maskp; 2193 #ifdef INET6 2194 int i; 2195 u_int32_t *addr6p, *mask6p; 2196 #endif 2197 char ip[NI_MAXHOST]; 2198 2199 #ifdef INET6 2200 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2201 #endif 2202 cp1 = s; 2203 if ((cp1 = strrchr(cp1, ':'))) { 2204 /* service/port provided */ 2205 *cp1++ = '\0'; 2206 if (strlen(cp1) == 1 && *cp1 == '*') 2207 /* any port allowed */ 2208 ap.port = 0; 2209 else if ((se = getservbyname(cp1, "udp"))) { 2210 ap.port = ntohs(se->s_port); 2211 } else { 2212 ap.port = strtol(cp1, &cp2, 0); 2213 if (*cp2 != '\0') 2214 return (-1); /* port not numeric */ 2215 } 2216 } else { 2217 if ((se = getservbyname("syslog", "udp"))) 2218 ap.port = ntohs(se->s_port); 2219 else 2220 /* sanity, should not happen */ 2221 ap.port = 514; 2222 } 2223 2224 if ((cp1 = strchr(s, '/')) != NULL && 2225 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2226 *cp1 = '\0'; 2227 if ((masklen = atoi(cp1 + 1)) < 0) 2228 return (-1); 2229 } 2230 #ifdef INET6 2231 if (*s == '[') { 2232 cp2 = s + strlen(s) - 1; 2233 if (*cp2 == ']') { 2234 ++s; 2235 *cp2 = '\0'; 2236 } else { 2237 cp2 = NULL; 2238 } 2239 } else { 2240 cp2 = NULL; 2241 } 2242 #endif 2243 memset(&hints, 0, sizeof(hints)); 2244 hints.ai_family = PF_UNSPEC; 2245 hints.ai_socktype = SOCK_DGRAM; 2246 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2247 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2248 ap.isnumeric = 1; 2249 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2250 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2251 ap.a_mask.ss_family = res->ai_family; 2252 if (res->ai_family == AF_INET) { 2253 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2254 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2255 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2256 if (masklen < 0) { 2257 /* use default netmask */ 2258 if (IN_CLASSA(ntohl(addrp->s_addr))) 2259 maskp->s_addr = htonl(IN_CLASSA_NET); 2260 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2261 maskp->s_addr = htonl(IN_CLASSB_NET); 2262 else 2263 maskp->s_addr = htonl(IN_CLASSC_NET); 2264 } else if (masklen <= 32) { 2265 /* convert masklen to netmask */ 2266 if (masklen == 0) 2267 maskp->s_addr = 0; 2268 else 2269 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2270 } else { 2271 freeaddrinfo(res); 2272 return (-1); 2273 } 2274 /* Lose any host bits in the network number. */ 2275 addrp->s_addr &= maskp->s_addr; 2276 } 2277 #ifdef INET6 2278 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2279 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2280 if (masklen < 0) 2281 masklen = 128; 2282 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2283 /* convert masklen to netmask */ 2284 while (masklen > 0) { 2285 if (masklen < 32) { 2286 *mask6p = htonl(~(0xffffffff >> masklen)); 2287 break; 2288 } 2289 *mask6p++ = 0xffffffff; 2290 masklen -= 32; 2291 } 2292 /* Lose any host bits in the network number. */ 2293 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2294 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2295 for (i = 0; i < 4; i++) 2296 addr6p[i] &= mask6p[i]; 2297 } 2298 #endif 2299 else { 2300 freeaddrinfo(res); 2301 return (-1); 2302 } 2303 freeaddrinfo(res); 2304 } else { 2305 /* arg `s' is domain name */ 2306 ap.isnumeric = 0; 2307 ap.a_name = s; 2308 if (cp1) 2309 *cp1 = '/'; 2310 #ifdef INET6 2311 if (cp2) { 2312 *cp2 = ']'; 2313 --s; 2314 } 2315 #endif 2316 } 2317 2318 if (Debug) { 2319 printf("allowaddr: rule %d: ", NumAllowed); 2320 if (ap.isnumeric) { 2321 printf("numeric, "); 2322 getnameinfo((struct sockaddr *)&ap.a_addr, 2323 ((struct sockaddr *)&ap.a_addr)->sa_len, 2324 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2325 printf("addr = %s, ", ip); 2326 getnameinfo((struct sockaddr *)&ap.a_mask, 2327 ((struct sockaddr *)&ap.a_mask)->sa_len, 2328 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2329 printf("mask = %s; ", ip); 2330 } else { 2331 printf("domainname = %s; ", ap.a_name); 2332 } 2333 printf("port = %d\n", ap.port); 2334 } 2335 2336 if ((AllowedPeers = realloc(AllowedPeers, 2337 ++NumAllowed * sizeof(struct allowedpeer))) 2338 == NULL) { 2339 logerror("realloc"); 2340 exit(1); 2341 } 2342 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2343 return (0); 2344 } 2345 2346 /* 2347 * Validate that the remote peer has permission to log to us. 2348 */ 2349 static int 2350 validate(struct sockaddr *sa, const char *hname) 2351 { 2352 int i; 2353 size_t l1, l2; 2354 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2355 struct allowedpeer *ap; 2356 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2357 #ifdef INET6 2358 int j, reject; 2359 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2360 #endif 2361 struct addrinfo hints, *res; 2362 u_short sport; 2363 2364 if (NumAllowed == 0) 2365 /* traditional behaviour, allow everything */ 2366 return (1); 2367 2368 (void)strlcpy(name, hname, sizeof(name)); 2369 memset(&hints, 0, sizeof(hints)); 2370 hints.ai_family = PF_UNSPEC; 2371 hints.ai_socktype = SOCK_DGRAM; 2372 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2373 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2374 freeaddrinfo(res); 2375 else if (strchr(name, '.') == NULL) { 2376 strlcat(name, ".", sizeof name); 2377 strlcat(name, LocalDomain, sizeof name); 2378 } 2379 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2380 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2381 return (0); /* for safety, should not occur */ 2382 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2383 ip, port, name); 2384 sport = atoi(port); 2385 2386 /* now, walk down the list */ 2387 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2388 if (ap->port != 0 && ap->port != sport) { 2389 dprintf("rejected in rule %d due to port mismatch.\n", i); 2390 continue; 2391 } 2392 2393 if (ap->isnumeric) { 2394 if (ap->a_addr.ss_family != sa->sa_family) { 2395 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2396 continue; 2397 } 2398 if (ap->a_addr.ss_family == AF_INET) { 2399 sin4 = (struct sockaddr_in *)sa; 2400 a4p = (struct sockaddr_in *)&ap->a_addr; 2401 m4p = (struct sockaddr_in *)&ap->a_mask; 2402 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2403 != a4p->sin_addr.s_addr) { 2404 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2405 continue; 2406 } 2407 } 2408 #ifdef INET6 2409 else if (ap->a_addr.ss_family == AF_INET6) { 2410 sin6 = (struct sockaddr_in6 *)sa; 2411 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2412 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2413 if (a6p->sin6_scope_id != 0 && 2414 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2415 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2416 continue; 2417 } 2418 reject = 0; 2419 for (j = 0; j < 16; j += 4) { 2420 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2421 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2422 ++reject; 2423 break; 2424 } 2425 } 2426 if (reject) { 2427 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2428 continue; 2429 } 2430 } 2431 #endif 2432 else 2433 continue; 2434 } else { 2435 cp = ap->a_name; 2436 l1 = strlen(name); 2437 if (*cp == '*') { 2438 /* allow wildmatch */ 2439 cp++; 2440 l2 = strlen(cp); 2441 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2442 dprintf("rejected in rule %d due to name mismatch.\n", i); 2443 continue; 2444 } 2445 } else { 2446 /* exact match */ 2447 l2 = strlen(cp); 2448 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2449 dprintf("rejected in rule %d due to name mismatch.\n", i); 2450 continue; 2451 } 2452 } 2453 } 2454 dprintf("accepted in rule %d.\n", i); 2455 return (1); /* hooray! */ 2456 } 2457 return (0); 2458 } 2459 2460 /* 2461 * Fairly similar to popen(3), but returns an open descriptor, as 2462 * opposed to a FILE *. 2463 */ 2464 static int 2465 p_open(const char *prog, pid_t *rpid) 2466 { 2467 int pfd[2], nulldesc; 2468 pid_t pid; 2469 sigset_t omask, mask; 2470 char *argv[4]; /* sh -c cmd NULL */ 2471 char errmsg[200]; 2472 2473 if (pipe(pfd) == -1) 2474 return (-1); 2475 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2476 /* we are royally screwed anyway */ 2477 return (-1); 2478 2479 sigemptyset(&mask); 2480 sigaddset(&mask, SIGALRM); 2481 sigaddset(&mask, SIGHUP); 2482 sigprocmask(SIG_BLOCK, &mask, &omask); 2483 switch ((pid = fork())) { 2484 case -1: 2485 sigprocmask(SIG_SETMASK, &omask, 0); 2486 close(nulldesc); 2487 return (-1); 2488 2489 case 0: 2490 argv[0] = strdup("sh"); 2491 argv[1] = strdup("-c"); 2492 argv[2] = strdup(prog); 2493 argv[3] = NULL; 2494 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2495 logerror("strdup"); 2496 exit(1); 2497 } 2498 2499 alarm(0); 2500 (void)setsid(); /* Avoid catching SIGHUPs. */ 2501 2502 /* 2503 * Throw away pending signals, and reset signal 2504 * behaviour to standard values. 2505 */ 2506 signal(SIGALRM, SIG_IGN); 2507 signal(SIGHUP, SIG_IGN); 2508 sigprocmask(SIG_SETMASK, &omask, 0); 2509 signal(SIGPIPE, SIG_DFL); 2510 signal(SIGQUIT, SIG_DFL); 2511 signal(SIGALRM, SIG_DFL); 2512 signal(SIGHUP, SIG_DFL); 2513 2514 dup2(pfd[0], STDIN_FILENO); 2515 dup2(nulldesc, STDOUT_FILENO); 2516 dup2(nulldesc, STDERR_FILENO); 2517 closefrom(3); 2518 2519 (void)execvp(_PATH_BSHELL, argv); 2520 _exit(255); 2521 } 2522 2523 sigprocmask(SIG_SETMASK, &omask, 0); 2524 close(nulldesc); 2525 close(pfd[0]); 2526 /* 2527 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2528 * supposed to get an EWOULDBLOCK on writev(2), which is 2529 * caught by the logic above anyway, which will in turn close 2530 * the pipe, and fork a new logging subprocess if necessary. 2531 * The stale subprocess will be killed some time later unless 2532 * it terminated itself due to closing its input pipe (so we 2533 * get rid of really dead puppies). 2534 */ 2535 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2536 /* This is bad. */ 2537 (void)snprintf(errmsg, sizeof errmsg, 2538 "Warning: cannot change pipe to PID %d to " 2539 "non-blocking behaviour.", 2540 (int)pid); 2541 logerror(errmsg); 2542 } 2543 *rpid = pid; 2544 return (pfd[1]); 2545 } 2546 2547 static void 2548 deadq_enter(pid_t pid, const char *name) 2549 { 2550 dq_t p; 2551 int status; 2552 2553 /* 2554 * Be paranoid, if we can't signal the process, don't enter it 2555 * into the dead queue (perhaps it's already dead). If possible, 2556 * we try to fetch and log the child's status. 2557 */ 2558 if (kill(pid, 0) != 0) { 2559 if (waitpid(pid, &status, WNOHANG) > 0) 2560 log_deadchild(pid, status, name); 2561 return; 2562 } 2563 2564 p = malloc(sizeof(struct deadq_entry)); 2565 if (p == NULL) { 2566 logerror("malloc"); 2567 exit(1); 2568 } 2569 2570 p->dq_pid = pid; 2571 p->dq_timeout = DQ_TIMO_INIT; 2572 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2573 } 2574 2575 static int 2576 deadq_remove(pid_t pid) 2577 { 2578 dq_t q; 2579 2580 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2581 if (q->dq_pid == pid) { 2582 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2583 free(q); 2584 return (1); 2585 } 2586 } 2587 2588 return (0); 2589 } 2590 2591 static void 2592 log_deadchild(pid_t pid, int status, const char *name) 2593 { 2594 int code; 2595 char buf[256]; 2596 const char *reason; 2597 2598 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2599 if (WIFSIGNALED(status)) { 2600 reason = "due to signal"; 2601 code = WTERMSIG(status); 2602 } else { 2603 reason = "with status"; 2604 code = WEXITSTATUS(status); 2605 if (code == 0) 2606 return; 2607 } 2608 (void)snprintf(buf, sizeof buf, 2609 "Logging subprocess %d (%s) exited %s %d.", 2610 pid, name, reason, code); 2611 logerror(buf); 2612 } 2613 2614 static int * 2615 socksetup(int af, char *bindhostname) 2616 { 2617 struct addrinfo hints, *res, *r; 2618 const char *bindservice; 2619 char *cp; 2620 int error, maxs, *s, *socks; 2621 2622 /* 2623 * We have to handle this case for backwards compatibility: 2624 * If there are two (or more) colons but no '[' and ']', 2625 * assume this is an inet6 address without a service. 2626 */ 2627 bindservice = "syslog"; 2628 if (bindhostname != NULL) { 2629 #ifdef INET6 2630 if (*bindhostname == '[' && 2631 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2632 ++bindhostname; 2633 *cp = '\0'; 2634 if (cp[1] == ':' && cp[2] != '\0') 2635 bindservice = cp + 2; 2636 } else { 2637 #endif 2638 cp = strchr(bindhostname, ':'); 2639 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2640 *cp = '\0'; 2641 if (cp[1] != '\0') 2642 bindservice = cp + 1; 2643 if (cp == bindhostname) 2644 bindhostname = NULL; 2645 } 2646 #ifdef INET6 2647 } 2648 #endif 2649 } 2650 2651 memset(&hints, 0, sizeof(hints)); 2652 hints.ai_flags = AI_PASSIVE; 2653 hints.ai_family = af; 2654 hints.ai_socktype = SOCK_DGRAM; 2655 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2656 if (error) { 2657 logerror(gai_strerror(error)); 2658 errno = 0; 2659 die(0); 2660 } 2661 2662 /* Count max number of sockets we may open */ 2663 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2664 socks = malloc((maxs+1) * sizeof(int)); 2665 if (socks == NULL) { 2666 logerror("couldn't allocate memory for sockets"); 2667 die(0); 2668 } 2669 2670 *socks = 0; /* num of sockets counter at start of array */ 2671 s = socks + 1; 2672 for (r = res; r; r = r->ai_next) { 2673 int on = 1; 2674 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2675 if (*s < 0) { 2676 logerror("socket"); 2677 continue; 2678 } 2679 #ifdef INET6 2680 if (r->ai_family == AF_INET6) { 2681 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2682 (char *)&on, sizeof (on)) < 0) { 2683 logerror("setsockopt"); 2684 close(*s); 2685 continue; 2686 } 2687 } 2688 #endif 2689 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2690 (char *)&on, sizeof (on)) < 0) { 2691 logerror("setsockopt"); 2692 close(*s); 2693 continue; 2694 } 2695 /* 2696 * RFC 3164 recommends that client side message 2697 * should come from the privileged syslogd port. 2698 * 2699 * If the system administrator choose not to obey 2700 * this, we can skip the bind() step so that the 2701 * system will choose a port for us. 2702 */ 2703 if (!NoBind) { 2704 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2705 logerror("bind"); 2706 close(*s); 2707 continue; 2708 } 2709 2710 if (!SecureMode) 2711 increase_rcvbuf(*s); 2712 } 2713 2714 (*socks)++; 2715 s++; 2716 } 2717 2718 if (*socks == 0) { 2719 free(socks); 2720 if (Debug) 2721 return (NULL); 2722 else 2723 die(0); 2724 } 2725 if (res) 2726 freeaddrinfo(res); 2727 2728 return (socks); 2729 } 2730 2731 static void 2732 increase_rcvbuf(int fd) 2733 { 2734 socklen_t len, slen; 2735 2736 slen = sizeof(len); 2737 2738 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2739 if (len < RCVBUF_MINSIZE) { 2740 len = RCVBUF_MINSIZE; 2741 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2742 } 2743 } 2744 } 2745