1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE 120 /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 #include <sys/types.h> 92 93 #include <netinet/in.h> 94 #include <netdb.h> 95 #include <arpa/inet.h> 96 97 #include <ctype.h> 98 #include <err.h> 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <libutil.h> 102 #include <limits.h> 103 #include <paths.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmpx.h> 111 112 #include "pathnames.h" 113 #include "ttymsg.h" 114 115 #define SYSLOG_NAMES 116 #include <sys/syslog.h> 117 118 const char *ConfFile = _PATH_LOGCONF; 119 const char *PidFile = _PATH_LOGPID; 120 const char ctty[] = _PATH_CONSOLE; 121 122 #define dprintf if (Debug) printf 123 124 #define MAXUNAMES 20 /* maximum number of user names */ 125 126 /* 127 * Unix sockets. 128 * We have two default sockets, one with 666 permissions, 129 * and one for privileged programs. 130 */ 131 struct funix { 132 int s; 133 const char *name; 134 mode_t mode; 135 STAILQ_ENTRY(funix) next; 136 }; 137 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 138 { NULL } }; 139 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 140 { &funix_secure } }; 141 142 STAILQ_HEAD(, funix) funixes = { &funix_default, 143 &(funix_secure.next.stqe_next) }; 144 145 /* 146 * Flags to logmsg(). 147 */ 148 149 #define IGN_CONS 0x001 /* don't print on console */ 150 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 151 #define ADDDATE 0x004 /* add a date to the message */ 152 #define MARK 0x008 /* this message is a mark */ 153 #define ISKERNEL 0x010 /* kernel generated message */ 154 155 /* 156 * This structure represents the files that will have log 157 * copies printed. 158 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 159 * or if f_type if F_PIPE and f_pid > 0. 160 */ 161 162 struct filed { 163 struct filed *f_next; /* next in linked list */ 164 short f_type; /* entry type, see below */ 165 short f_file; /* file descriptor */ 166 time_t f_time; /* time this was last written */ 167 char *f_host; /* host from which to recd. */ 168 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 169 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 170 #define PRI_LT 0x1 171 #define PRI_EQ 0x2 172 #define PRI_GT 0x4 173 char *f_program; /* program this applies to */ 174 union { 175 char f_uname[MAXUNAMES][MAXLOGNAME]; 176 struct { 177 char f_hname[MAXHOSTNAMELEN]; 178 struct addrinfo *f_addr; 179 180 } f_forw; /* forwarding address */ 181 char f_fname[MAXPATHLEN]; 182 struct { 183 char f_pname[MAXPATHLEN]; 184 pid_t f_pid; 185 } f_pipe; 186 } f_un; 187 char f_prevline[MAXSVLINE]; /* last message logged */ 188 char f_lasttime[16]; /* time of last occurrence */ 189 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 190 int f_prevpri; /* pri of f_prevline */ 191 int f_prevlen; /* length of f_prevline */ 192 int f_prevcount; /* repetition cnt of prevline */ 193 u_int f_repeatcount; /* number of "repeated" msgs */ 194 int f_flags; /* file-specific flags */ 195 #define FFLAG_SYNC 0x01 196 #define FFLAG_NEEDSYNC 0x02 197 }; 198 199 /* 200 * Queue of about-to-be dead processes we should watch out for. 201 */ 202 203 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 204 struct stailhead *deadq_headp; 205 206 struct deadq_entry { 207 pid_t dq_pid; 208 int dq_timeout; 209 TAILQ_ENTRY(deadq_entry) dq_entries; 210 }; 211 212 /* 213 * The timeout to apply to processes waiting on the dead queue. Unit 214 * of measure is `mark intervals', i.e. 20 minutes by default. 215 * Processes on the dead queue will be terminated after that time. 216 */ 217 218 #define DQ_TIMO_INIT 2 219 220 typedef struct deadq_entry *dq_t; 221 222 223 /* 224 * Struct to hold records of network addresses that are allowed to log 225 * to us. 226 */ 227 struct allowedpeer { 228 int isnumeric; 229 u_short port; 230 union { 231 struct { 232 struct sockaddr_storage addr; 233 struct sockaddr_storage mask; 234 } numeric; 235 char *name; 236 } u; 237 #define a_addr u.numeric.addr 238 #define a_mask u.numeric.mask 239 #define a_name u.name 240 }; 241 242 243 /* 244 * Intervals at which we flush out "message repeated" messages, 245 * in seconds after previous message is logged. After each flush, 246 * we move to the next interval until we reach the largest. 247 */ 248 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 249 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 250 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 251 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 252 (f)->f_repeatcount = MAXREPEAT; \ 253 } 254 255 /* values for f_type */ 256 #define F_UNUSED 0 /* unused entry */ 257 #define F_FILE 1 /* regular file */ 258 #define F_TTY 2 /* terminal */ 259 #define F_CONSOLE 3 /* console terminal */ 260 #define F_FORW 4 /* remote machine */ 261 #define F_USERS 5 /* list of users */ 262 #define F_WALL 6 /* everyone logged on */ 263 #define F_PIPE 7 /* pipe to program */ 264 265 const char *TypeNames[8] = { 266 "UNUSED", "FILE", "TTY", "CONSOLE", 267 "FORW", "USERS", "WALL", "PIPE" 268 }; 269 270 static struct filed *Files; /* Log files that we write to */ 271 static struct filed consfile; /* Console */ 272 273 static int Debug; /* debug flag */ 274 static int resolve = 1; /* resolve hostname */ 275 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 276 static const char *LocalDomain; /* our local domain name */ 277 static int *finet; /* Internet datagram socket */ 278 static int fklog = -1; /* /dev/klog */ 279 static int Initialized; /* set when we have initialized ourselves */ 280 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 281 static int MarkSeq; /* mark sequence number */ 282 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 283 static int SecureMode; /* when true, receive only unix domain socks */ 284 #ifdef INET6 285 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 286 #else 287 static int family = PF_INET; /* protocol family (IPv4 only) */ 288 #endif 289 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 290 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 291 static int use_bootfile; /* log entire bootfile for every kern msg */ 292 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 293 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 294 295 static char bootfile[MAXLINE+1]; /* booted kernel file */ 296 297 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 298 static int NumAllowed; /* Number of entries in AllowedPeers */ 299 static int RemoteAddDate; /* Always set the date on remote messages */ 300 301 static int UniquePriority; /* Only log specified priority? */ 302 static int LogFacPri; /* Put facility and priority in log message: */ 303 /* 0=no, 1=numeric, 2=names */ 304 static int KeepKernFac; /* Keep remotely logged kernel facility */ 305 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 306 static struct pidfh *pfh; 307 308 volatile sig_atomic_t MarkSet, WantDie; 309 310 static int allowaddr(char *); 311 static void cfline(const char *, struct filed *, 312 const char *, const char *); 313 static const char *cvthname(struct sockaddr *); 314 static void deadq_enter(pid_t, const char *); 315 static int deadq_remove(pid_t); 316 static int decode(const char *, const CODE *); 317 static void die(int); 318 static void dodie(int); 319 static void dofsync(void); 320 static void domark(int); 321 static void fprintlog(struct filed *, int, const char *); 322 static int *socksetup(int, char *); 323 static void init(int); 324 static void logerror(const char *); 325 static void logmsg(int, const char *, const char *, int); 326 static void log_deadchild(pid_t, int, const char *); 327 static void markit(void); 328 static int skip_message(const char *, const char *, int); 329 static void printline(const char *, char *, int); 330 static void printsys(char *); 331 static int p_open(const char *, pid_t *); 332 static void readklog(void); 333 static void reapchild(int); 334 static void usage(void); 335 static int validate(struct sockaddr *, const char *); 336 static void unmapped(struct sockaddr *); 337 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 338 static int waitdaemon(int, int, int); 339 static void timedout(int); 340 static void increase_rcvbuf(int); 341 342 int 343 main(int argc, char *argv[]) 344 { 345 int ch, i, fdsrmax = 0, l; 346 struct sockaddr_un sunx, fromunix; 347 struct sockaddr_storage frominet; 348 fd_set *fdsr = NULL; 349 char line[MAXLINE + 1]; 350 char *bindhostname; 351 const char *hname; 352 struct timeval tv, *tvp; 353 struct sigaction sact; 354 struct funix *fx, *fx1; 355 sigset_t mask; 356 pid_t ppid = 1, spid; 357 socklen_t len; 358 359 if (madvise(NULL, 0, MADV_PROTECT) != 0) 360 dprintf("madvise() failed: %s\n", strerror(errno)); 361 362 bindhostname = NULL; 363 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 364 != -1) 365 switch (ch) { 366 case '4': 367 family = PF_INET; 368 break; 369 #ifdef INET6 370 case '6': 371 family = PF_INET6; 372 break; 373 #endif 374 case '8': 375 mask_C1 = 0; 376 break; 377 case 'A': 378 send_to_all++; 379 break; 380 case 'a': /* allow specific network addresses only */ 381 if (allowaddr(optarg) == -1) 382 usage(); 383 break; 384 case 'b': 385 bindhostname = optarg; 386 break; 387 case 'c': 388 no_compress++; 389 break; 390 case 'C': 391 logflags |= O_CREAT; 392 break; 393 case 'd': /* debug */ 394 Debug++; 395 break; 396 case 'f': /* configuration file */ 397 ConfFile = optarg; 398 break; 399 case 'k': /* keep remote kern fac */ 400 KeepKernFac = 1; 401 break; 402 case 'l': 403 { 404 long perml; 405 mode_t mode; 406 char *name, *ep; 407 408 if (optarg[0] == '/') { 409 mode = DEFFILEMODE; 410 name = optarg; 411 } else if ((name = strchr(optarg, ':')) != NULL) { 412 *name++ = '\0'; 413 if (name[0] != '/') 414 errx(1, "socket name must be absolute " 415 "path"); 416 if (isdigit(*optarg)) { 417 perml = strtol(optarg, &ep, 8); 418 if (*ep || perml < 0 || 419 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 420 errx(1, "invalid mode %s, exiting", 421 optarg); 422 mode = (mode_t )perml; 423 } else 424 errx(1, "invalid mode %s, exiting", 425 optarg); 426 } else /* doesn't begin with '/', and no ':' */ 427 errx(1, "can't parse path %s", optarg); 428 429 if (strlen(name) >= sizeof(sunx.sun_path)) 430 errx(1, "%s path too long, exiting", name); 431 if ((fx = malloc(sizeof(struct funix))) == NULL) 432 errx(1, "malloc failed"); 433 fx->s = -1; 434 fx->name = name; 435 fx->mode = mode; 436 STAILQ_INSERT_TAIL(&funixes, fx, next); 437 break; 438 } 439 case 'm': /* mark interval */ 440 MarkInterval = atoi(optarg) * 60; 441 break; 442 case 'N': 443 NoBind = 1; 444 SecureMode = 1; 445 break; 446 case 'n': 447 resolve = 0; 448 break; 449 case 'o': 450 use_bootfile = 1; 451 break; 452 case 'p': /* path */ 453 if (strlen(optarg) >= sizeof(sunx.sun_path)) 454 errx(1, "%s path too long, exiting", optarg); 455 funix_default.name = optarg; 456 break; 457 case 'P': /* path for alt. PID */ 458 PidFile = optarg; 459 break; 460 case 's': /* no network mode */ 461 SecureMode++; 462 break; 463 case 'S': /* path for privileged originator */ 464 if (strlen(optarg) >= sizeof(sunx.sun_path)) 465 errx(1, "%s path too long, exiting", optarg); 466 funix_secure.name = optarg; 467 break; 468 case 'T': 469 RemoteAddDate = 1; 470 break; 471 case 'u': /* only log specified priority */ 472 UniquePriority++; 473 break; 474 case 'v': /* log facility and priority */ 475 LogFacPri++; 476 break; 477 default: 478 usage(); 479 } 480 if ((argc -= optind) != 0) 481 usage(); 482 483 pfh = pidfile_open(PidFile, 0600, &spid); 484 if (pfh == NULL) { 485 if (errno == EEXIST) 486 errx(1, "syslogd already running, pid: %d", spid); 487 warn("cannot open pid file"); 488 } 489 490 if (!Debug) { 491 ppid = waitdaemon(0, 0, 30); 492 if (ppid < 0) { 493 warn("could not become daemon"); 494 pidfile_remove(pfh); 495 exit(1); 496 } 497 } else { 498 setlinebuf(stdout); 499 } 500 501 if (NumAllowed) 502 endservent(); 503 504 consfile.f_type = F_CONSOLE; 505 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 506 sizeof(consfile.f_un.f_fname)); 507 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 508 (void)signal(SIGTERM, dodie); 509 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 510 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 511 /* 512 * We don't want the SIGCHLD and SIGHUP handlers to interfere 513 * with each other; they are likely candidates for being called 514 * simultaneously (SIGHUP closes pipe descriptor, process dies, 515 * SIGCHLD happens). 516 */ 517 sigemptyset(&mask); 518 sigaddset(&mask, SIGHUP); 519 sact.sa_handler = reapchild; 520 sact.sa_mask = mask; 521 sact.sa_flags = SA_RESTART; 522 (void)sigaction(SIGCHLD, &sact, NULL); 523 (void)signal(SIGALRM, domark); 524 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 525 (void)alarm(TIMERINTVL); 526 527 TAILQ_INIT(&deadq_head); 528 529 #ifndef SUN_LEN 530 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 531 #endif 532 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 533 (void)unlink(fx->name); 534 memset(&sunx, 0, sizeof(sunx)); 535 sunx.sun_family = AF_LOCAL; 536 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 537 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 538 if (fx->s < 0 || 539 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 540 chmod(fx->name, fx->mode) < 0) { 541 (void)snprintf(line, sizeof line, 542 "cannot create %s", fx->name); 543 logerror(line); 544 dprintf("cannot create %s (%d)\n", fx->name, errno); 545 if (fx == &funix_default || fx == &funix_secure) 546 die(0); 547 else { 548 STAILQ_REMOVE(&funixes, fx, funix, next); 549 continue; 550 } 551 } 552 increase_rcvbuf(fx->s); 553 } 554 if (SecureMode <= 1) 555 finet = socksetup(family, bindhostname); 556 557 if (finet) { 558 if (SecureMode) { 559 for (i = 0; i < *finet; i++) { 560 if (shutdown(finet[i+1], SHUT_RD) < 0) { 561 logerror("shutdown"); 562 if (!Debug) 563 die(0); 564 } 565 } 566 } else { 567 dprintf("listening on inet and/or inet6 socket\n"); 568 } 569 dprintf("sending on inet and/or inet6 socket\n"); 570 } 571 572 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 573 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 574 fklog = -1; 575 if (fklog < 0) 576 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 577 578 /* tuck my process id away */ 579 pidfile_write(pfh); 580 581 dprintf("off & running....\n"); 582 583 init(0); 584 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 585 sigemptyset(&mask); 586 sigaddset(&mask, SIGCHLD); 587 sact.sa_handler = init; 588 sact.sa_mask = mask; 589 sact.sa_flags = SA_RESTART; 590 (void)sigaction(SIGHUP, &sact, NULL); 591 592 tvp = &tv; 593 tv.tv_sec = tv.tv_usec = 0; 594 595 if (fklog != -1 && fklog > fdsrmax) 596 fdsrmax = fklog; 597 if (finet && !SecureMode) { 598 for (i = 0; i < *finet; i++) { 599 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 600 fdsrmax = finet[i+1]; 601 } 602 } 603 STAILQ_FOREACH(fx, &funixes, next) 604 if (fx->s > fdsrmax) 605 fdsrmax = fx->s; 606 607 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 608 sizeof(fd_mask)); 609 if (fdsr == NULL) 610 errx(1, "calloc fd_set"); 611 612 for (;;) { 613 if (MarkSet) 614 markit(); 615 if (WantDie) 616 die(WantDie); 617 618 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 619 sizeof(fd_mask)); 620 621 if (fklog != -1) 622 FD_SET(fklog, fdsr); 623 if (finet && !SecureMode) { 624 for (i = 0; i < *finet; i++) { 625 if (finet[i+1] != -1) 626 FD_SET(finet[i+1], fdsr); 627 } 628 } 629 STAILQ_FOREACH(fx, &funixes, next) 630 FD_SET(fx->s, fdsr); 631 632 i = select(fdsrmax+1, fdsr, NULL, NULL, 633 needdofsync ? &tv : tvp); 634 switch (i) { 635 case 0: 636 dofsync(); 637 needdofsync = 0; 638 if (tvp) { 639 tvp = NULL; 640 if (ppid != 1) 641 kill(ppid, SIGALRM); 642 } 643 continue; 644 case -1: 645 if (errno != EINTR) 646 logerror("select"); 647 continue; 648 } 649 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 650 readklog(); 651 if (finet && !SecureMode) { 652 for (i = 0; i < *finet; i++) { 653 if (FD_ISSET(finet[i+1], fdsr)) { 654 len = sizeof(frominet); 655 l = recvfrom(finet[i+1], line, MAXLINE, 656 0, (struct sockaddr *)&frominet, 657 &len); 658 if (l > 0) { 659 line[l] = '\0'; 660 hname = cvthname((struct sockaddr *)&frominet); 661 unmapped((struct sockaddr *)&frominet); 662 if (validate((struct sockaddr *)&frominet, hname)) 663 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 664 } else if (l < 0 && errno != EINTR) 665 logerror("recvfrom inet"); 666 } 667 } 668 } 669 STAILQ_FOREACH(fx, &funixes, next) { 670 if (FD_ISSET(fx->s, fdsr)) { 671 len = sizeof(fromunix); 672 l = recvfrom(fx->s, line, MAXLINE, 0, 673 (struct sockaddr *)&fromunix, &len); 674 if (l > 0) { 675 line[l] = '\0'; 676 printline(LocalHostName, line, 0); 677 } else if (l < 0 && errno != EINTR) 678 logerror("recvfrom unix"); 679 } 680 } 681 } 682 if (fdsr) 683 free(fdsr); 684 } 685 686 static void 687 unmapped(struct sockaddr *sa) 688 { 689 struct sockaddr_in6 *sin6; 690 struct sockaddr_in sin4; 691 692 if (sa->sa_family != AF_INET6) 693 return; 694 if (sa->sa_len != sizeof(struct sockaddr_in6) || 695 sizeof(sin4) > sa->sa_len) 696 return; 697 sin6 = (struct sockaddr_in6 *)sa; 698 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 699 return; 700 701 memset(&sin4, 0, sizeof(sin4)); 702 sin4.sin_family = AF_INET; 703 sin4.sin_len = sizeof(struct sockaddr_in); 704 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 705 sizeof(sin4.sin_addr)); 706 sin4.sin_port = sin6->sin6_port; 707 708 memcpy(sa, &sin4, sin4.sin_len); 709 } 710 711 static void 712 usage(void) 713 { 714 715 fprintf(stderr, "%s\n%s\n%s\n%s\n", 716 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 717 " [-b bind_address] [-f config_file]", 718 " [-l [mode:]path] [-m mark_interval]", 719 " [-P pid_file] [-p log_socket]"); 720 exit(1); 721 } 722 723 /* 724 * Take a raw input line, decode the message, and print the message 725 * on the appropriate log files. 726 */ 727 static void 728 printline(const char *hname, char *msg, int flags) 729 { 730 char *p, *q; 731 long n; 732 int c, pri; 733 char line[MAXLINE + 1]; 734 735 /* test for special codes */ 736 p = msg; 737 pri = DEFUPRI; 738 if (*p == '<') { 739 errno = 0; 740 n = strtol(p + 1, &q, 10); 741 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 742 p = q + 1; 743 pri = n; 744 } 745 } 746 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 747 pri = DEFUPRI; 748 749 /* 750 * Don't allow users to log kernel messages. 751 * NOTE: since LOG_KERN == 0 this will also match 752 * messages with no facility specified. 753 */ 754 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 755 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 756 757 q = line; 758 759 while ((c = (unsigned char)*p++) != '\0' && 760 q < &line[sizeof(line) - 4]) { 761 if (mask_C1 && (c & 0x80) && c < 0xA0) { 762 c &= 0x7F; 763 *q++ = 'M'; 764 *q++ = '-'; 765 } 766 if (isascii(c) && iscntrl(c)) { 767 if (c == '\n') { 768 *q++ = ' '; 769 } else if (c == '\t') { 770 *q++ = '\t'; 771 } else { 772 *q++ = '^'; 773 *q++ = c ^ 0100; 774 } 775 } else { 776 *q++ = c; 777 } 778 } 779 *q = '\0'; 780 781 logmsg(pri, line, hname, flags); 782 } 783 784 /* 785 * Read /dev/klog while data are available, split into lines. 786 */ 787 static void 788 readklog(void) 789 { 790 char *p, *q, line[MAXLINE + 1]; 791 int len, i; 792 793 len = 0; 794 for (;;) { 795 i = read(fklog, line + len, MAXLINE - 1 - len); 796 if (i > 0) { 797 line[i + len] = '\0'; 798 } else { 799 if (i < 0 && errno != EINTR && errno != EAGAIN) { 800 logerror("klog"); 801 fklog = -1; 802 } 803 break; 804 } 805 806 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 807 *q = '\0'; 808 printsys(p); 809 } 810 len = strlen(p); 811 if (len >= MAXLINE - 1) { 812 printsys(p); 813 len = 0; 814 } 815 if (len > 0) 816 memmove(line, p, len + 1); 817 } 818 if (len > 0) 819 printsys(line); 820 } 821 822 /* 823 * Take a raw input line from /dev/klog, format similar to syslog(). 824 */ 825 static void 826 printsys(char *msg) 827 { 828 char *p, *q; 829 long n; 830 int flags, isprintf, pri; 831 832 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 833 p = msg; 834 pri = DEFSPRI; 835 isprintf = 1; 836 if (*p == '<') { 837 errno = 0; 838 n = strtol(p + 1, &q, 10); 839 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 840 p = q + 1; 841 pri = n; 842 isprintf = 0; 843 } 844 } 845 /* 846 * Kernel printf's and LOG_CONSOLE messages have been displayed 847 * on the console already. 848 */ 849 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 850 flags |= IGN_CONS; 851 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 852 pri = DEFSPRI; 853 logmsg(pri, p, LocalHostName, flags); 854 } 855 856 static time_t now; 857 858 /* 859 * Match a program or host name against a specification. 860 * Return a non-0 value if the message must be ignored 861 * based on the specification. 862 */ 863 static int 864 skip_message(const char *name, const char *spec, int checkcase) 865 { 866 const char *s; 867 char prev, next; 868 int exclude = 0; 869 /* Behaviour on explicit match */ 870 871 if (spec == NULL) 872 return 0; 873 switch (*spec) { 874 case '-': 875 exclude = 1; 876 /*FALLTHROUGH*/ 877 case '+': 878 spec++; 879 break; 880 default: 881 break; 882 } 883 if (checkcase) 884 s = strstr (spec, name); 885 else 886 s = strcasestr (spec, name); 887 888 if (s != NULL) { 889 prev = (s == spec ? ',' : *(s - 1)); 890 next = *(s + strlen (name)); 891 892 if (prev == ',' && (next == '\0' || next == ',')) 893 /* Explicit match: skip iff the spec is an 894 exclusive one. */ 895 return exclude; 896 } 897 898 /* No explicit match for this name: skip the message iff 899 the spec is an inclusive one. */ 900 return !exclude; 901 } 902 903 /* 904 * Log a message to the appropriate log files, users, etc. based on 905 * the priority. 906 */ 907 static void 908 logmsg(int pri, const char *msg, const char *from, int flags) 909 { 910 struct filed *f; 911 int i, fac, msglen, omask, prilev; 912 const char *timestamp; 913 char prog[NAME_MAX+1]; 914 char buf[MAXLINE+1]; 915 916 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 917 pri, flags, from, msg); 918 919 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 920 921 /* 922 * Check to see if msg looks non-standard. 923 */ 924 msglen = strlen(msg); 925 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 926 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 927 flags |= ADDDATE; 928 929 (void)time(&now); 930 if (flags & ADDDATE) { 931 timestamp = ctime(&now) + 4; 932 } else { 933 timestamp = msg; 934 msg += 16; 935 msglen -= 16; 936 } 937 938 /* skip leading blanks */ 939 while (isspace(*msg)) { 940 msg++; 941 msglen--; 942 } 943 944 /* extract facility and priority level */ 945 if (flags & MARK) 946 fac = LOG_NFACILITIES; 947 else 948 fac = LOG_FAC(pri); 949 950 /* Check maximum facility number. */ 951 if (fac > LOG_NFACILITIES) { 952 (void)sigsetmask(omask); 953 return; 954 } 955 956 prilev = LOG_PRI(pri); 957 958 /* extract program name */ 959 for (i = 0; i < NAME_MAX; i++) { 960 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 961 msg[i] == '/' || isspace(msg[i])) 962 break; 963 prog[i] = msg[i]; 964 } 965 prog[i] = 0; 966 967 /* add kernel prefix for kernel messages */ 968 if (flags & ISKERNEL) { 969 snprintf(buf, sizeof(buf), "%s: %s", 970 use_bootfile ? bootfile : "kernel", msg); 971 msg = buf; 972 msglen = strlen(buf); 973 } 974 975 /* log the message to the particular outputs */ 976 if (!Initialized) { 977 f = &consfile; 978 /* 979 * Open in non-blocking mode to avoid hangs during open 980 * and close(waiting for the port to drain). 981 */ 982 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 983 984 if (f->f_file >= 0) { 985 (void)strlcpy(f->f_lasttime, timestamp, 986 sizeof(f->f_lasttime)); 987 fprintlog(f, flags, msg); 988 (void)close(f->f_file); 989 } 990 (void)sigsetmask(omask); 991 return; 992 } 993 for (f = Files; f; f = f->f_next) { 994 /* skip messages that are incorrect priority */ 995 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 996 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 997 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 998 ) 999 || f->f_pmask[fac] == INTERNAL_NOPRI) 1000 continue; 1001 1002 /* skip messages with the incorrect hostname */ 1003 if (skip_message(from, f->f_host, 0)) 1004 continue; 1005 1006 /* skip messages with the incorrect program name */ 1007 if (skip_message(prog, f->f_program, 1)) 1008 continue; 1009 1010 /* skip message to console if it has already been printed */ 1011 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1012 continue; 1013 1014 /* don't output marks to recently written files */ 1015 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1016 continue; 1017 1018 /* 1019 * suppress duplicate lines to this file 1020 */ 1021 if (no_compress - (f->f_type != F_PIPE) < 1 && 1022 (flags & MARK) == 0 && msglen == f->f_prevlen && 1023 !strcmp(msg, f->f_prevline) && 1024 !strcasecmp(from, f->f_prevhost)) { 1025 (void)strlcpy(f->f_lasttime, timestamp, 1026 sizeof(f->f_lasttime)); 1027 f->f_prevcount++; 1028 dprintf("msg repeated %d times, %ld sec of %d\n", 1029 f->f_prevcount, (long)(now - f->f_time), 1030 repeatinterval[f->f_repeatcount]); 1031 /* 1032 * If domark would have logged this by now, 1033 * flush it now (so we don't hold isolated messages), 1034 * but back off so we'll flush less often 1035 * in the future. 1036 */ 1037 if (now > REPEATTIME(f)) { 1038 fprintlog(f, flags, (char *)NULL); 1039 BACKOFF(f); 1040 } 1041 } else { 1042 /* new line, save it */ 1043 if (f->f_prevcount) 1044 fprintlog(f, 0, (char *)NULL); 1045 f->f_repeatcount = 0; 1046 f->f_prevpri = pri; 1047 (void)strlcpy(f->f_lasttime, timestamp, 1048 sizeof(f->f_lasttime)); 1049 (void)strlcpy(f->f_prevhost, from, 1050 sizeof(f->f_prevhost)); 1051 if (msglen < MAXSVLINE) { 1052 f->f_prevlen = msglen; 1053 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1054 fprintlog(f, flags, (char *)NULL); 1055 } else { 1056 f->f_prevline[0] = 0; 1057 f->f_prevlen = 0; 1058 fprintlog(f, flags, msg); 1059 } 1060 } 1061 } 1062 (void)sigsetmask(omask); 1063 } 1064 1065 static void 1066 dofsync(void) 1067 { 1068 struct filed *f; 1069 1070 for (f = Files; f; f = f->f_next) { 1071 if ((f->f_type == F_FILE) && 1072 (f->f_flags & FFLAG_NEEDSYNC)) { 1073 f->f_flags &= ~FFLAG_NEEDSYNC; 1074 (void)fsync(f->f_file); 1075 } 1076 } 1077 } 1078 1079 #define IOV_SIZE 7 1080 static void 1081 fprintlog(struct filed *f, int flags, const char *msg) 1082 { 1083 struct iovec iov[IOV_SIZE]; 1084 struct iovec *v; 1085 struct addrinfo *r; 1086 int i, l, lsent = 0; 1087 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1088 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1089 const char *msgret; 1090 1091 v = iov; 1092 if (f->f_type == F_WALL) { 1093 v->iov_base = greetings; 1094 /* The time displayed is not synchornized with the other log 1095 * destinations (like messages). Following fragment was using 1096 * ctime(&now), which was updating the time every 30 sec. 1097 * With f_lasttime, time is synchronized correctly. 1098 */ 1099 v->iov_len = snprintf(greetings, sizeof greetings, 1100 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1101 f->f_prevhost, f->f_lasttime); 1102 if (v->iov_len >= sizeof greetings) 1103 v->iov_len = sizeof greetings - 1; 1104 v++; 1105 v->iov_base = nul; 1106 v->iov_len = 0; 1107 v++; 1108 } else { 1109 v->iov_base = f->f_lasttime; 1110 v->iov_len = strlen(f->f_lasttime); 1111 v++; 1112 v->iov_base = space; 1113 v->iov_len = 1; 1114 v++; 1115 } 1116 1117 if (LogFacPri) { 1118 static char fp_buf[30]; /* Hollow laugh */ 1119 int fac = f->f_prevpri & LOG_FACMASK; 1120 int pri = LOG_PRI(f->f_prevpri); 1121 const char *f_s = NULL; 1122 char f_n[5]; /* Hollow laugh */ 1123 const char *p_s = NULL; 1124 char p_n[5]; /* Hollow laugh */ 1125 1126 if (LogFacPri > 1) { 1127 const CODE *c; 1128 1129 for (c = facilitynames; c->c_name; c++) { 1130 if (c->c_val == fac) { 1131 f_s = c->c_name; 1132 break; 1133 } 1134 } 1135 for (c = prioritynames; c->c_name; c++) { 1136 if (c->c_val == pri) { 1137 p_s = c->c_name; 1138 break; 1139 } 1140 } 1141 } 1142 if (!f_s) { 1143 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1144 f_s = f_n; 1145 } 1146 if (!p_s) { 1147 snprintf(p_n, sizeof p_n, "%d", pri); 1148 p_s = p_n; 1149 } 1150 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1151 v->iov_base = fp_buf; 1152 v->iov_len = strlen(fp_buf); 1153 } else { 1154 v->iov_base = nul; 1155 v->iov_len = 0; 1156 } 1157 v++; 1158 1159 v->iov_base = f->f_prevhost; 1160 v->iov_len = strlen(v->iov_base); 1161 v++; 1162 v->iov_base = space; 1163 v->iov_len = 1; 1164 v++; 1165 1166 if (msg) { 1167 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1168 if (wmsg == NULL) { 1169 logerror("strdup"); 1170 exit(1); 1171 } 1172 v->iov_base = wmsg; 1173 v->iov_len = strlen(msg); 1174 } else if (f->f_prevcount > 1) { 1175 v->iov_base = repbuf; 1176 v->iov_len = snprintf(repbuf, sizeof repbuf, 1177 "last message repeated %d times", f->f_prevcount); 1178 } else { 1179 v->iov_base = f->f_prevline; 1180 v->iov_len = f->f_prevlen; 1181 } 1182 v++; 1183 1184 dprintf("Logging to %s", TypeNames[f->f_type]); 1185 f->f_time = now; 1186 1187 switch (f->f_type) { 1188 int port; 1189 case F_UNUSED: 1190 dprintf("\n"); 1191 break; 1192 1193 case F_FORW: 1194 port = (int)ntohs(((struct sockaddr_in *) 1195 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1196 if (port != 514) { 1197 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1198 } else { 1199 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1200 } 1201 /* check for local vs remote messages */ 1202 if (strcasecmp(f->f_prevhost, LocalHostName)) 1203 l = snprintf(line, sizeof line - 1, 1204 "<%d>%.15s Forwarded from %s: %s", 1205 f->f_prevpri, (char *)iov[0].iov_base, 1206 f->f_prevhost, (char *)iov[5].iov_base); 1207 else 1208 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1209 f->f_prevpri, (char *)iov[0].iov_base, 1210 (char *)iov[5].iov_base); 1211 if (l < 0) 1212 l = 0; 1213 else if (l > MAXLINE) 1214 l = MAXLINE; 1215 1216 if (finet) { 1217 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1218 for (i = 0; i < *finet; i++) { 1219 #if 0 1220 /* 1221 * should we check AF first, or just 1222 * trial and error? FWD 1223 */ 1224 if (r->ai_family == 1225 address_family_of(finet[i+1])) 1226 #endif 1227 lsent = sendto(finet[i+1], line, l, 0, 1228 r->ai_addr, r->ai_addrlen); 1229 if (lsent == l) 1230 break; 1231 } 1232 if (lsent == l && !send_to_all) 1233 break; 1234 } 1235 dprintf("lsent/l: %d/%d\n", lsent, l); 1236 if (lsent != l) { 1237 int e = errno; 1238 logerror("sendto"); 1239 errno = e; 1240 switch (errno) { 1241 case ENOBUFS: 1242 case ENETDOWN: 1243 case ENETUNREACH: 1244 case EHOSTUNREACH: 1245 case EHOSTDOWN: 1246 case EADDRNOTAVAIL: 1247 break; 1248 /* case EBADF: */ 1249 /* case EACCES: */ 1250 /* case ENOTSOCK: */ 1251 /* case EFAULT: */ 1252 /* case EMSGSIZE: */ 1253 /* case EAGAIN: */ 1254 /* case ENOBUFS: */ 1255 /* case ECONNREFUSED: */ 1256 default: 1257 dprintf("removing entry: errno=%d\n", e); 1258 f->f_type = F_UNUSED; 1259 break; 1260 } 1261 } 1262 } 1263 break; 1264 1265 case F_FILE: 1266 dprintf(" %s\n", f->f_un.f_fname); 1267 v->iov_base = lf; 1268 v->iov_len = 1; 1269 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1270 /* 1271 * If writev(2) fails for potentially transient errors 1272 * like the filesystem being full, ignore it. 1273 * Otherwise remove this logfile from the list. 1274 */ 1275 if (errno != ENOSPC) { 1276 int e = errno; 1277 (void)close(f->f_file); 1278 f->f_type = F_UNUSED; 1279 errno = e; 1280 logerror(f->f_un.f_fname); 1281 } 1282 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1283 f->f_flags |= FFLAG_NEEDSYNC; 1284 needdofsync = 1; 1285 } 1286 break; 1287 1288 case F_PIPE: 1289 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1290 v->iov_base = lf; 1291 v->iov_len = 1; 1292 if (f->f_un.f_pipe.f_pid == 0) { 1293 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1294 &f->f_un.f_pipe.f_pid)) < 0) { 1295 f->f_type = F_UNUSED; 1296 logerror(f->f_un.f_pipe.f_pname); 1297 break; 1298 } 1299 } 1300 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1301 int e = errno; 1302 (void)close(f->f_file); 1303 if (f->f_un.f_pipe.f_pid > 0) 1304 deadq_enter(f->f_un.f_pipe.f_pid, 1305 f->f_un.f_pipe.f_pname); 1306 f->f_un.f_pipe.f_pid = 0; 1307 errno = e; 1308 logerror(f->f_un.f_pipe.f_pname); 1309 } 1310 break; 1311 1312 case F_CONSOLE: 1313 if (flags & IGN_CONS) { 1314 dprintf(" (ignored)\n"); 1315 break; 1316 } 1317 /* FALLTHROUGH */ 1318 1319 case F_TTY: 1320 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1321 v->iov_base = crlf; 1322 v->iov_len = 2; 1323 1324 errno = 0; /* ttymsg() only sometimes returns an errno */ 1325 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1326 f->f_type = F_UNUSED; 1327 logerror(msgret); 1328 } 1329 break; 1330 1331 case F_USERS: 1332 case F_WALL: 1333 dprintf("\n"); 1334 v->iov_base = crlf; 1335 v->iov_len = 2; 1336 wallmsg(f, iov, IOV_SIZE); 1337 break; 1338 } 1339 f->f_prevcount = 0; 1340 free(wmsg); 1341 } 1342 1343 /* 1344 * WALLMSG -- Write a message to the world at large 1345 * 1346 * Write the specified message to either the entire 1347 * world, or a list of approved users. 1348 */ 1349 static void 1350 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1351 { 1352 static int reenter; /* avoid calling ourselves */ 1353 struct utmpx *ut; 1354 int i; 1355 const char *p; 1356 1357 if (reenter++) 1358 return; 1359 setutxent(); 1360 /* NOSTRICT */ 1361 while ((ut = getutxent()) != NULL) { 1362 if (ut->ut_type != USER_PROCESS) 1363 continue; 1364 if (f->f_type == F_WALL) { 1365 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1366 TTYMSGTIME)) != NULL) { 1367 errno = 0; /* already in msg */ 1368 logerror(p); 1369 } 1370 continue; 1371 } 1372 /* should we send the message to this user? */ 1373 for (i = 0; i < MAXUNAMES; i++) { 1374 if (!f->f_un.f_uname[i][0]) 1375 break; 1376 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1377 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1378 TTYMSGTIME)) != NULL) { 1379 errno = 0; /* already in msg */ 1380 logerror(p); 1381 } 1382 break; 1383 } 1384 } 1385 } 1386 endutxent(); 1387 reenter = 0; 1388 } 1389 1390 static void 1391 reapchild(int signo __unused) 1392 { 1393 int status; 1394 pid_t pid; 1395 struct filed *f; 1396 1397 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1398 if (!Initialized) 1399 /* Don't tell while we are initting. */ 1400 continue; 1401 1402 /* First, look if it's a process from the dead queue. */ 1403 if (deadq_remove(pid)) 1404 goto oncemore; 1405 1406 /* Now, look in list of active processes. */ 1407 for (f = Files; f; f = f->f_next) 1408 if (f->f_type == F_PIPE && 1409 f->f_un.f_pipe.f_pid == pid) { 1410 (void)close(f->f_file); 1411 f->f_un.f_pipe.f_pid = 0; 1412 log_deadchild(pid, status, 1413 f->f_un.f_pipe.f_pname); 1414 break; 1415 } 1416 oncemore: 1417 continue; 1418 } 1419 } 1420 1421 /* 1422 * Return a printable representation of a host address. 1423 */ 1424 static const char * 1425 cvthname(struct sockaddr *f) 1426 { 1427 int error, hl; 1428 sigset_t omask, nmask; 1429 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1430 1431 error = getnameinfo((struct sockaddr *)f, 1432 ((struct sockaddr *)f)->sa_len, 1433 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1434 dprintf("cvthname(%s)\n", ip); 1435 1436 if (error) { 1437 dprintf("Malformed from address %s\n", gai_strerror(error)); 1438 return ("???"); 1439 } 1440 if (!resolve) 1441 return (ip); 1442 1443 sigemptyset(&nmask); 1444 sigaddset(&nmask, SIGHUP); 1445 sigprocmask(SIG_BLOCK, &nmask, &omask); 1446 error = getnameinfo((struct sockaddr *)f, 1447 ((struct sockaddr *)f)->sa_len, 1448 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1449 sigprocmask(SIG_SETMASK, &omask, NULL); 1450 if (error) { 1451 dprintf("Host name for your address (%s) unknown\n", ip); 1452 return (ip); 1453 } 1454 hl = strlen(hname); 1455 if (hl > 0 && hname[hl-1] == '.') 1456 hname[--hl] = '\0'; 1457 trimdomain(hname, hl); 1458 return (hname); 1459 } 1460 1461 static void 1462 dodie(int signo) 1463 { 1464 1465 WantDie = signo; 1466 } 1467 1468 static void 1469 domark(int signo __unused) 1470 { 1471 1472 MarkSet = 1; 1473 } 1474 1475 /* 1476 * Print syslogd errors some place. 1477 */ 1478 static void 1479 logerror(const char *type) 1480 { 1481 char buf[512]; 1482 static int recursed = 0; 1483 1484 /* If there's an error while trying to log an error, give up. */ 1485 if (recursed) 1486 return; 1487 recursed++; 1488 if (errno) 1489 (void)snprintf(buf, 1490 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1491 else 1492 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1493 errno = 0; 1494 dprintf("%s\n", buf); 1495 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1496 recursed--; 1497 } 1498 1499 static void 1500 die(int signo) 1501 { 1502 struct filed *f; 1503 struct funix *fx; 1504 int was_initialized; 1505 char buf[100]; 1506 1507 was_initialized = Initialized; 1508 Initialized = 0; /* Don't log SIGCHLDs. */ 1509 for (f = Files; f != NULL; f = f->f_next) { 1510 /* flush any pending output */ 1511 if (f->f_prevcount) 1512 fprintlog(f, 0, (char *)NULL); 1513 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1514 (void)close(f->f_file); 1515 f->f_un.f_pipe.f_pid = 0; 1516 } 1517 } 1518 Initialized = was_initialized; 1519 if (signo) { 1520 dprintf("syslogd: exiting on signal %d\n", signo); 1521 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1522 errno = 0; 1523 logerror(buf); 1524 } 1525 STAILQ_FOREACH(fx, &funixes, next) 1526 (void)unlink(fx->name); 1527 pidfile_remove(pfh); 1528 1529 exit(1); 1530 } 1531 1532 /* 1533 * INIT -- Initialize syslogd from configuration table 1534 */ 1535 static void 1536 init(int signo) 1537 { 1538 int i; 1539 FILE *cf; 1540 struct filed *f, *next, **nextp; 1541 char *p; 1542 char cline[LINE_MAX]; 1543 char prog[LINE_MAX]; 1544 char host[MAXHOSTNAMELEN]; 1545 char oldLocalHostName[MAXHOSTNAMELEN]; 1546 char hostMsg[2*MAXHOSTNAMELEN+40]; 1547 char bootfileMsg[LINE_MAX]; 1548 1549 dprintf("init\n"); 1550 1551 /* 1552 * Load hostname (may have changed). 1553 */ 1554 if (signo != 0) 1555 (void)strlcpy(oldLocalHostName, LocalHostName, 1556 sizeof(oldLocalHostName)); 1557 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1558 err(EX_OSERR, "gethostname() failed"); 1559 if ((p = strchr(LocalHostName, '.')) != NULL) { 1560 *p++ = '\0'; 1561 LocalDomain = p; 1562 } else { 1563 LocalDomain = ""; 1564 } 1565 1566 /* 1567 * Close all open log files. 1568 */ 1569 Initialized = 0; 1570 for (f = Files; f != NULL; f = next) { 1571 /* flush any pending output */ 1572 if (f->f_prevcount) 1573 fprintlog(f, 0, (char *)NULL); 1574 1575 switch (f->f_type) { 1576 case F_FILE: 1577 case F_FORW: 1578 case F_CONSOLE: 1579 case F_TTY: 1580 (void)close(f->f_file); 1581 break; 1582 case F_PIPE: 1583 if (f->f_un.f_pipe.f_pid > 0) { 1584 (void)close(f->f_file); 1585 deadq_enter(f->f_un.f_pipe.f_pid, 1586 f->f_un.f_pipe.f_pname); 1587 } 1588 f->f_un.f_pipe.f_pid = 0; 1589 break; 1590 } 1591 next = f->f_next; 1592 if (f->f_program) free(f->f_program); 1593 if (f->f_host) free(f->f_host); 1594 free((char *)f); 1595 } 1596 Files = NULL; 1597 nextp = &Files; 1598 1599 /* open the configuration file */ 1600 if ((cf = fopen(ConfFile, "r")) == NULL) { 1601 dprintf("cannot open %s\n", ConfFile); 1602 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1603 if (*nextp == NULL) { 1604 logerror("calloc"); 1605 exit(1); 1606 } 1607 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1608 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1609 if ((*nextp)->f_next == NULL) { 1610 logerror("calloc"); 1611 exit(1); 1612 } 1613 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1614 Initialized = 1; 1615 return; 1616 } 1617 1618 /* 1619 * Foreach line in the conf table, open that file. 1620 */ 1621 f = NULL; 1622 (void)strlcpy(host, "*", sizeof(host)); 1623 (void)strlcpy(prog, "*", sizeof(prog)); 1624 while (fgets(cline, sizeof(cline), cf) != NULL) { 1625 /* 1626 * check for end-of-section, comments, strip off trailing 1627 * spaces and newline character. #!prog is treated specially: 1628 * following lines apply only to that program. 1629 */ 1630 for (p = cline; isspace(*p); ++p) 1631 continue; 1632 if (*p == 0) 1633 continue; 1634 if (*p == '#') { 1635 p++; 1636 if (*p != '!' && *p != '+' && *p != '-') 1637 continue; 1638 } 1639 if (*p == '+' || *p == '-') { 1640 host[0] = *p++; 1641 while (isspace(*p)) 1642 p++; 1643 if ((!*p) || (*p == '*')) { 1644 (void)strlcpy(host, "*", sizeof(host)); 1645 continue; 1646 } 1647 if (*p == '@') 1648 p = LocalHostName; 1649 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1650 if (!isalnum(*p) && *p != '.' && *p != '-' 1651 && *p != ',' && *p != ':' && *p != '%') 1652 break; 1653 host[i] = *p++; 1654 } 1655 host[i] = '\0'; 1656 continue; 1657 } 1658 if (*p == '!') { 1659 p++; 1660 while (isspace(*p)) p++; 1661 if ((!*p) || (*p == '*')) { 1662 (void)strlcpy(prog, "*", sizeof(prog)); 1663 continue; 1664 } 1665 for (i = 0; i < LINE_MAX - 1; i++) { 1666 if (!isprint(p[i]) || isspace(p[i])) 1667 break; 1668 prog[i] = p[i]; 1669 } 1670 prog[i] = 0; 1671 continue; 1672 } 1673 for (p = cline + 1; *p != '\0'; p++) { 1674 if (*p != '#') 1675 continue; 1676 if (*(p - 1) == '\\') { 1677 strcpy(p - 1, p); 1678 p--; 1679 continue; 1680 } 1681 *p = '\0'; 1682 break; 1683 } 1684 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1685 cline[i] = '\0'; 1686 f = (struct filed *)calloc(1, sizeof(*f)); 1687 if (f == NULL) { 1688 logerror("calloc"); 1689 exit(1); 1690 } 1691 *nextp = f; 1692 nextp = &f->f_next; 1693 cfline(cline, f, prog, host); 1694 } 1695 1696 /* close the configuration file */ 1697 (void)fclose(cf); 1698 1699 Initialized = 1; 1700 1701 if (Debug) { 1702 int port; 1703 for (f = Files; f; f = f->f_next) { 1704 for (i = 0; i <= LOG_NFACILITIES; i++) 1705 if (f->f_pmask[i] == INTERNAL_NOPRI) 1706 printf("X "); 1707 else 1708 printf("%d ", f->f_pmask[i]); 1709 printf("%s: ", TypeNames[f->f_type]); 1710 switch (f->f_type) { 1711 case F_FILE: 1712 printf("%s", f->f_un.f_fname); 1713 break; 1714 1715 case F_CONSOLE: 1716 case F_TTY: 1717 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1718 break; 1719 1720 case F_FORW: 1721 port = (int)ntohs(((struct sockaddr_in *) 1722 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1723 if (port != 514) { 1724 printf("%s:%d", 1725 f->f_un.f_forw.f_hname, port); 1726 } else { 1727 printf("%s", f->f_un.f_forw.f_hname); 1728 } 1729 break; 1730 1731 case F_PIPE: 1732 printf("%s", f->f_un.f_pipe.f_pname); 1733 break; 1734 1735 case F_USERS: 1736 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1737 printf("%s, ", f->f_un.f_uname[i]); 1738 break; 1739 } 1740 if (f->f_program) 1741 printf(" (%s)", f->f_program); 1742 printf("\n"); 1743 } 1744 } 1745 1746 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1747 dprintf("syslogd: restarted\n"); 1748 /* 1749 * Log a change in hostname, but only on a restart. 1750 */ 1751 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1752 (void)snprintf(hostMsg, sizeof(hostMsg), 1753 "syslogd: hostname changed, \"%s\" to \"%s\"", 1754 oldLocalHostName, LocalHostName); 1755 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1756 dprintf("%s\n", hostMsg); 1757 } 1758 /* 1759 * Log the kernel boot file if we aren't going to use it as 1760 * the prefix, and if this is *not* a restart. 1761 */ 1762 if (signo == 0 && !use_bootfile) { 1763 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1764 "syslogd: kernel boot file is %s", bootfile); 1765 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1766 dprintf("%s\n", bootfileMsg); 1767 } 1768 } 1769 1770 /* 1771 * Crack a configuration file line 1772 */ 1773 static void 1774 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1775 { 1776 struct addrinfo hints, *res; 1777 int error, i, pri, syncfile; 1778 const char *p, *q; 1779 char *bp; 1780 char buf[MAXLINE], ebuf[100]; 1781 1782 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1783 1784 errno = 0; /* keep strerror() stuff out of logerror messages */ 1785 1786 /* clear out file entry */ 1787 memset(f, 0, sizeof(*f)); 1788 for (i = 0; i <= LOG_NFACILITIES; i++) 1789 f->f_pmask[i] = INTERNAL_NOPRI; 1790 1791 /* save hostname if any */ 1792 if (host && *host == '*') 1793 host = NULL; 1794 if (host) { 1795 int hl; 1796 1797 f->f_host = strdup(host); 1798 if (f->f_host == NULL) { 1799 logerror("strdup"); 1800 exit(1); 1801 } 1802 hl = strlen(f->f_host); 1803 if (hl > 0 && f->f_host[hl-1] == '.') 1804 f->f_host[--hl] = '\0'; 1805 trimdomain(f->f_host, hl); 1806 } 1807 1808 /* save program name if any */ 1809 if (prog && *prog == '*') 1810 prog = NULL; 1811 if (prog) { 1812 f->f_program = strdup(prog); 1813 if (f->f_program == NULL) { 1814 logerror("strdup"); 1815 exit(1); 1816 } 1817 } 1818 1819 /* scan through the list of selectors */ 1820 for (p = line; *p && *p != '\t' && *p != ' ';) { 1821 int pri_done; 1822 int pri_cmp; 1823 int pri_invert; 1824 1825 /* find the end of this facility name list */ 1826 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1827 continue; 1828 1829 /* get the priority comparison */ 1830 pri_cmp = 0; 1831 pri_done = 0; 1832 pri_invert = 0; 1833 if (*q == '!') { 1834 pri_invert = 1; 1835 q++; 1836 } 1837 while (!pri_done) { 1838 switch (*q) { 1839 case '<': 1840 pri_cmp |= PRI_LT; 1841 q++; 1842 break; 1843 case '=': 1844 pri_cmp |= PRI_EQ; 1845 q++; 1846 break; 1847 case '>': 1848 pri_cmp |= PRI_GT; 1849 q++; 1850 break; 1851 default: 1852 pri_done++; 1853 break; 1854 } 1855 } 1856 1857 /* collect priority name */ 1858 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1859 *bp++ = *q++; 1860 *bp = '\0'; 1861 1862 /* skip cruft */ 1863 while (strchr(",;", *q)) 1864 q++; 1865 1866 /* decode priority name */ 1867 if (*buf == '*') { 1868 pri = LOG_PRIMASK; 1869 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1870 } else { 1871 /* Ignore trailing spaces. */ 1872 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1873 buf[i] = '\0'; 1874 1875 pri = decode(buf, prioritynames); 1876 if (pri < 0) { 1877 errno = 0; 1878 (void)snprintf(ebuf, sizeof ebuf, 1879 "unknown priority name \"%s\"", buf); 1880 logerror(ebuf); 1881 return; 1882 } 1883 } 1884 if (!pri_cmp) 1885 pri_cmp = (UniquePriority) 1886 ? (PRI_EQ) 1887 : (PRI_EQ | PRI_GT) 1888 ; 1889 if (pri_invert) 1890 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1891 1892 /* scan facilities */ 1893 while (*p && !strchr("\t.; ", *p)) { 1894 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1895 *bp++ = *p++; 1896 *bp = '\0'; 1897 1898 if (*buf == '*') { 1899 for (i = 0; i < LOG_NFACILITIES; i++) { 1900 f->f_pmask[i] = pri; 1901 f->f_pcmp[i] = pri_cmp; 1902 } 1903 } else { 1904 i = decode(buf, facilitynames); 1905 if (i < 0) { 1906 errno = 0; 1907 (void)snprintf(ebuf, sizeof ebuf, 1908 "unknown facility name \"%s\"", 1909 buf); 1910 logerror(ebuf); 1911 return; 1912 } 1913 f->f_pmask[i >> 3] = pri; 1914 f->f_pcmp[i >> 3] = pri_cmp; 1915 } 1916 while (*p == ',' || *p == ' ') 1917 p++; 1918 } 1919 1920 p = q; 1921 } 1922 1923 /* skip to action part */ 1924 while (*p == '\t' || *p == ' ') 1925 p++; 1926 1927 if (*p == '-') { 1928 syncfile = 0; 1929 p++; 1930 } else 1931 syncfile = 1; 1932 1933 switch (*p) { 1934 case '@': 1935 { 1936 char *tp; 1937 char endkey = ':'; 1938 /* 1939 * scan forward to see if there is a port defined. 1940 * so we can't use strlcpy.. 1941 */ 1942 i = sizeof(f->f_un.f_forw.f_hname); 1943 tp = f->f_un.f_forw.f_hname; 1944 p++; 1945 1946 /* 1947 * an ipv6 address should start with a '[' in that case 1948 * we should scan for a ']' 1949 */ 1950 if (*p == '[') { 1951 p++; 1952 endkey = ']'; 1953 } 1954 while (*p && (*p != endkey) && (i-- > 0)) { 1955 *tp++ = *p++; 1956 } 1957 if (endkey == ']' && *p == endkey) 1958 p++; 1959 *tp = '\0'; 1960 } 1961 /* See if we copied a domain and have a port */ 1962 if (*p == ':') 1963 p++; 1964 else 1965 p = NULL; 1966 1967 memset(&hints, 0, sizeof(hints)); 1968 hints.ai_family = family; 1969 hints.ai_socktype = SOCK_DGRAM; 1970 error = getaddrinfo(f->f_un.f_forw.f_hname, 1971 p ? p : "syslog", &hints, &res); 1972 if (error) { 1973 logerror(gai_strerror(error)); 1974 break; 1975 } 1976 f->f_un.f_forw.f_addr = res; 1977 f->f_type = F_FORW; 1978 break; 1979 1980 case '/': 1981 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1982 f->f_type = F_UNUSED; 1983 logerror(p); 1984 break; 1985 } 1986 if (syncfile) 1987 f->f_flags |= FFLAG_SYNC; 1988 if (isatty(f->f_file)) { 1989 if (strcmp(p, ctty) == 0) 1990 f->f_type = F_CONSOLE; 1991 else 1992 f->f_type = F_TTY; 1993 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1994 sizeof(f->f_un.f_fname)); 1995 } else { 1996 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1997 f->f_type = F_FILE; 1998 } 1999 break; 2000 2001 case '|': 2002 f->f_un.f_pipe.f_pid = 0; 2003 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2004 sizeof(f->f_un.f_pipe.f_pname)); 2005 f->f_type = F_PIPE; 2006 break; 2007 2008 case '*': 2009 f->f_type = F_WALL; 2010 break; 2011 2012 default: 2013 for (i = 0; i < MAXUNAMES && *p; i++) { 2014 for (q = p; *q && *q != ','; ) 2015 q++; 2016 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2017 if ((q - p) >= MAXLOGNAME) 2018 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2019 else 2020 f->f_un.f_uname[i][q - p] = '\0'; 2021 while (*q == ',' || *q == ' ') 2022 q++; 2023 p = q; 2024 } 2025 f->f_type = F_USERS; 2026 break; 2027 } 2028 } 2029 2030 2031 /* 2032 * Decode a symbolic name to a numeric value 2033 */ 2034 static int 2035 decode(const char *name, const CODE *codetab) 2036 { 2037 const CODE *c; 2038 char *p, buf[40]; 2039 2040 if (isdigit(*name)) 2041 return (atoi(name)); 2042 2043 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2044 if (isupper(*name)) 2045 *p = tolower(*name); 2046 else 2047 *p = *name; 2048 } 2049 *p = '\0'; 2050 for (c = codetab; c->c_name; c++) 2051 if (!strcmp(buf, c->c_name)) 2052 return (c->c_val); 2053 2054 return (-1); 2055 } 2056 2057 static void 2058 markit(void) 2059 { 2060 struct filed *f; 2061 dq_t q, next; 2062 2063 now = time((time_t *)NULL); 2064 MarkSeq += TIMERINTVL; 2065 if (MarkSeq >= MarkInterval) { 2066 logmsg(LOG_INFO, "-- MARK --", 2067 LocalHostName, ADDDATE|MARK); 2068 MarkSeq = 0; 2069 } 2070 2071 for (f = Files; f; f = f->f_next) { 2072 if (f->f_prevcount && now >= REPEATTIME(f)) { 2073 dprintf("flush %s: repeated %d times, %d sec.\n", 2074 TypeNames[f->f_type], f->f_prevcount, 2075 repeatinterval[f->f_repeatcount]); 2076 fprintlog(f, 0, (char *)NULL); 2077 BACKOFF(f); 2078 } 2079 } 2080 2081 /* Walk the dead queue, and see if we should signal somebody. */ 2082 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2083 next = TAILQ_NEXT(q, dq_entries); 2084 2085 switch (q->dq_timeout) { 2086 case 0: 2087 /* Already signalled once, try harder now. */ 2088 if (kill(q->dq_pid, SIGKILL) != 0) 2089 (void)deadq_remove(q->dq_pid); 2090 break; 2091 2092 case 1: 2093 /* 2094 * Timed out on dead queue, send terminate 2095 * signal. Note that we leave the removal 2096 * from the dead queue to reapchild(), which 2097 * will also log the event (unless the process 2098 * didn't even really exist, in case we simply 2099 * drop it from the dead queue). 2100 */ 2101 if (kill(q->dq_pid, SIGTERM) != 0) 2102 (void)deadq_remove(q->dq_pid); 2103 /* FALLTHROUGH */ 2104 2105 default: 2106 q->dq_timeout--; 2107 } 2108 } 2109 MarkSet = 0; 2110 (void)alarm(TIMERINTVL); 2111 } 2112 2113 /* 2114 * fork off and become a daemon, but wait for the child to come online 2115 * before returing to the parent, or we get disk thrashing at boot etc. 2116 * Set a timer so we don't hang forever if it wedges. 2117 */ 2118 static int 2119 waitdaemon(int nochdir, int noclose, int maxwait) 2120 { 2121 int fd; 2122 int status; 2123 pid_t pid, childpid; 2124 2125 switch (childpid = fork()) { 2126 case -1: 2127 return (-1); 2128 case 0: 2129 break; 2130 default: 2131 signal(SIGALRM, timedout); 2132 alarm(maxwait); 2133 while ((pid = wait3(&status, 0, NULL)) != -1) { 2134 if (WIFEXITED(status)) 2135 errx(1, "child pid %d exited with return code %d", 2136 pid, WEXITSTATUS(status)); 2137 if (WIFSIGNALED(status)) 2138 errx(1, "child pid %d exited on signal %d%s", 2139 pid, WTERMSIG(status), 2140 WCOREDUMP(status) ? " (core dumped)" : 2141 ""); 2142 if (pid == childpid) /* it's gone... */ 2143 break; 2144 } 2145 exit(0); 2146 } 2147 2148 if (setsid() == -1) 2149 return (-1); 2150 2151 if (!nochdir) 2152 (void)chdir("/"); 2153 2154 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2155 (void)dup2(fd, STDIN_FILENO); 2156 (void)dup2(fd, STDOUT_FILENO); 2157 (void)dup2(fd, STDERR_FILENO); 2158 if (fd > 2) 2159 (void)close (fd); 2160 } 2161 return (getppid()); 2162 } 2163 2164 /* 2165 * We get a SIGALRM from the child when it's running and finished doing it's 2166 * fsync()'s or O_SYNC writes for all the boot messages. 2167 * 2168 * We also get a signal from the kernel if the timer expires, so check to 2169 * see what happened. 2170 */ 2171 static void 2172 timedout(int sig __unused) 2173 { 2174 int left; 2175 left = alarm(0); 2176 signal(SIGALRM, SIG_DFL); 2177 if (left == 0) 2178 errx(1, "timed out waiting for child"); 2179 else 2180 _exit(0); 2181 } 2182 2183 /* 2184 * Add `s' to the list of allowable peer addresses to accept messages 2185 * from. 2186 * 2187 * `s' is a string in the form: 2188 * 2189 * [*]domainname[:{servicename|portnumber|*}] 2190 * 2191 * or 2192 * 2193 * netaddr/maskbits[:{servicename|portnumber|*}] 2194 * 2195 * Returns -1 on error, 0 if the argument was valid. 2196 */ 2197 static int 2198 allowaddr(char *s) 2199 { 2200 char *cp1, *cp2; 2201 struct allowedpeer ap; 2202 struct servent *se; 2203 int masklen = -1; 2204 struct addrinfo hints, *res; 2205 struct in_addr *addrp, *maskp; 2206 #ifdef INET6 2207 int i; 2208 u_int32_t *addr6p, *mask6p; 2209 #endif 2210 char ip[NI_MAXHOST]; 2211 2212 #ifdef INET6 2213 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2214 #endif 2215 cp1 = s; 2216 if ((cp1 = strrchr(cp1, ':'))) { 2217 /* service/port provided */ 2218 *cp1++ = '\0'; 2219 if (strlen(cp1) == 1 && *cp1 == '*') 2220 /* any port allowed */ 2221 ap.port = 0; 2222 else if ((se = getservbyname(cp1, "udp"))) { 2223 ap.port = ntohs(se->s_port); 2224 } else { 2225 ap.port = strtol(cp1, &cp2, 0); 2226 if (*cp2 != '\0') 2227 return (-1); /* port not numeric */ 2228 } 2229 } else { 2230 if ((se = getservbyname("syslog", "udp"))) 2231 ap.port = ntohs(se->s_port); 2232 else 2233 /* sanity, should not happen */ 2234 ap.port = 514; 2235 } 2236 2237 if ((cp1 = strchr(s, '/')) != NULL && 2238 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2239 *cp1 = '\0'; 2240 if ((masklen = atoi(cp1 + 1)) < 0) 2241 return (-1); 2242 } 2243 #ifdef INET6 2244 if (*s == '[') { 2245 cp2 = s + strlen(s) - 1; 2246 if (*cp2 == ']') { 2247 ++s; 2248 *cp2 = '\0'; 2249 } else { 2250 cp2 = NULL; 2251 } 2252 } else { 2253 cp2 = NULL; 2254 } 2255 #endif 2256 memset(&hints, 0, sizeof(hints)); 2257 hints.ai_family = PF_UNSPEC; 2258 hints.ai_socktype = SOCK_DGRAM; 2259 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2260 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2261 ap.isnumeric = 1; 2262 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2263 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2264 ap.a_mask.ss_family = res->ai_family; 2265 if (res->ai_family == AF_INET) { 2266 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2267 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2268 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2269 if (masklen < 0) { 2270 /* use default netmask */ 2271 if (IN_CLASSA(ntohl(addrp->s_addr))) 2272 maskp->s_addr = htonl(IN_CLASSA_NET); 2273 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2274 maskp->s_addr = htonl(IN_CLASSB_NET); 2275 else 2276 maskp->s_addr = htonl(IN_CLASSC_NET); 2277 } else if (masklen <= 32) { 2278 /* convert masklen to netmask */ 2279 if (masklen == 0) 2280 maskp->s_addr = 0; 2281 else 2282 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2283 } else { 2284 freeaddrinfo(res); 2285 return (-1); 2286 } 2287 /* Lose any host bits in the network number. */ 2288 addrp->s_addr &= maskp->s_addr; 2289 } 2290 #ifdef INET6 2291 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2292 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2293 if (masklen < 0) 2294 masklen = 128; 2295 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2296 /* convert masklen to netmask */ 2297 while (masklen > 0) { 2298 if (masklen < 32) { 2299 *mask6p = htonl(~(0xffffffff >> masklen)); 2300 break; 2301 } 2302 *mask6p++ = 0xffffffff; 2303 masklen -= 32; 2304 } 2305 /* Lose any host bits in the network number. */ 2306 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2307 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2308 for (i = 0; i < 4; i++) 2309 addr6p[i] &= mask6p[i]; 2310 } 2311 #endif 2312 else { 2313 freeaddrinfo(res); 2314 return (-1); 2315 } 2316 freeaddrinfo(res); 2317 } else { 2318 /* arg `s' is domain name */ 2319 ap.isnumeric = 0; 2320 ap.a_name = s; 2321 if (cp1) 2322 *cp1 = '/'; 2323 #ifdef INET6 2324 if (cp2) { 2325 *cp2 = ']'; 2326 --s; 2327 } 2328 #endif 2329 } 2330 2331 if (Debug) { 2332 printf("allowaddr: rule %d: ", NumAllowed); 2333 if (ap.isnumeric) { 2334 printf("numeric, "); 2335 getnameinfo((struct sockaddr *)&ap.a_addr, 2336 ((struct sockaddr *)&ap.a_addr)->sa_len, 2337 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2338 printf("addr = %s, ", ip); 2339 getnameinfo((struct sockaddr *)&ap.a_mask, 2340 ((struct sockaddr *)&ap.a_mask)->sa_len, 2341 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2342 printf("mask = %s; ", ip); 2343 } else { 2344 printf("domainname = %s; ", ap.a_name); 2345 } 2346 printf("port = %d\n", ap.port); 2347 } 2348 2349 if ((AllowedPeers = realloc(AllowedPeers, 2350 ++NumAllowed * sizeof(struct allowedpeer))) 2351 == NULL) { 2352 logerror("realloc"); 2353 exit(1); 2354 } 2355 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2356 return (0); 2357 } 2358 2359 /* 2360 * Validate that the remote peer has permission to log to us. 2361 */ 2362 static int 2363 validate(struct sockaddr *sa, const char *hname) 2364 { 2365 int i; 2366 size_t l1, l2; 2367 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2368 struct allowedpeer *ap; 2369 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2370 #ifdef INET6 2371 int j, reject; 2372 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2373 #endif 2374 struct addrinfo hints, *res; 2375 u_short sport; 2376 2377 if (NumAllowed == 0) 2378 /* traditional behaviour, allow everything */ 2379 return (1); 2380 2381 (void)strlcpy(name, hname, sizeof(name)); 2382 memset(&hints, 0, sizeof(hints)); 2383 hints.ai_family = PF_UNSPEC; 2384 hints.ai_socktype = SOCK_DGRAM; 2385 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2386 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2387 freeaddrinfo(res); 2388 else if (strchr(name, '.') == NULL) { 2389 strlcat(name, ".", sizeof name); 2390 strlcat(name, LocalDomain, sizeof name); 2391 } 2392 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2393 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2394 return (0); /* for safety, should not occur */ 2395 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2396 ip, port, name); 2397 sport = atoi(port); 2398 2399 /* now, walk down the list */ 2400 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2401 if (ap->port != 0 && ap->port != sport) { 2402 dprintf("rejected in rule %d due to port mismatch.\n", i); 2403 continue; 2404 } 2405 2406 if (ap->isnumeric) { 2407 if (ap->a_addr.ss_family != sa->sa_family) { 2408 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2409 continue; 2410 } 2411 if (ap->a_addr.ss_family == AF_INET) { 2412 sin4 = (struct sockaddr_in *)sa; 2413 a4p = (struct sockaddr_in *)&ap->a_addr; 2414 m4p = (struct sockaddr_in *)&ap->a_mask; 2415 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2416 != a4p->sin_addr.s_addr) { 2417 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2418 continue; 2419 } 2420 } 2421 #ifdef INET6 2422 else if (ap->a_addr.ss_family == AF_INET6) { 2423 sin6 = (struct sockaddr_in6 *)sa; 2424 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2425 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2426 if (a6p->sin6_scope_id != 0 && 2427 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2428 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2429 continue; 2430 } 2431 reject = 0; 2432 for (j = 0; j < 16; j += 4) { 2433 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2434 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2435 ++reject; 2436 break; 2437 } 2438 } 2439 if (reject) { 2440 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2441 continue; 2442 } 2443 } 2444 #endif 2445 else 2446 continue; 2447 } else { 2448 cp = ap->a_name; 2449 l1 = strlen(name); 2450 if (*cp == '*') { 2451 /* allow wildmatch */ 2452 cp++; 2453 l2 = strlen(cp); 2454 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2455 dprintf("rejected in rule %d due to name mismatch.\n", i); 2456 continue; 2457 } 2458 } else { 2459 /* exact match */ 2460 l2 = strlen(cp); 2461 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2462 dprintf("rejected in rule %d due to name mismatch.\n", i); 2463 continue; 2464 } 2465 } 2466 } 2467 dprintf("accepted in rule %d.\n", i); 2468 return (1); /* hooray! */ 2469 } 2470 return (0); 2471 } 2472 2473 /* 2474 * Fairly similar to popen(3), but returns an open descriptor, as 2475 * opposed to a FILE *. 2476 */ 2477 static int 2478 p_open(const char *prog, pid_t *rpid) 2479 { 2480 int pfd[2], nulldesc; 2481 pid_t pid; 2482 sigset_t omask, mask; 2483 char *argv[4]; /* sh -c cmd NULL */ 2484 char errmsg[200]; 2485 2486 if (pipe(pfd) == -1) 2487 return (-1); 2488 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2489 /* we are royally screwed anyway */ 2490 return (-1); 2491 2492 sigemptyset(&mask); 2493 sigaddset(&mask, SIGALRM); 2494 sigaddset(&mask, SIGHUP); 2495 sigprocmask(SIG_BLOCK, &mask, &omask); 2496 switch ((pid = fork())) { 2497 case -1: 2498 sigprocmask(SIG_SETMASK, &omask, 0); 2499 close(nulldesc); 2500 return (-1); 2501 2502 case 0: 2503 argv[0] = strdup("sh"); 2504 argv[1] = strdup("-c"); 2505 argv[2] = strdup(prog); 2506 argv[3] = NULL; 2507 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2508 logerror("strdup"); 2509 exit(1); 2510 } 2511 2512 alarm(0); 2513 (void)setsid(); /* Avoid catching SIGHUPs. */ 2514 2515 /* 2516 * Throw away pending signals, and reset signal 2517 * behaviour to standard values. 2518 */ 2519 signal(SIGALRM, SIG_IGN); 2520 signal(SIGHUP, SIG_IGN); 2521 sigprocmask(SIG_SETMASK, &omask, 0); 2522 signal(SIGPIPE, SIG_DFL); 2523 signal(SIGQUIT, SIG_DFL); 2524 signal(SIGALRM, SIG_DFL); 2525 signal(SIGHUP, SIG_DFL); 2526 2527 dup2(pfd[0], STDIN_FILENO); 2528 dup2(nulldesc, STDOUT_FILENO); 2529 dup2(nulldesc, STDERR_FILENO); 2530 closefrom(3); 2531 2532 (void)execvp(_PATH_BSHELL, argv); 2533 _exit(255); 2534 } 2535 2536 sigprocmask(SIG_SETMASK, &omask, 0); 2537 close(nulldesc); 2538 close(pfd[0]); 2539 /* 2540 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2541 * supposed to get an EWOULDBLOCK on writev(2), which is 2542 * caught by the logic above anyway, which will in turn close 2543 * the pipe, and fork a new logging subprocess if necessary. 2544 * The stale subprocess will be killed some time later unless 2545 * it terminated itself due to closing its input pipe (so we 2546 * get rid of really dead puppies). 2547 */ 2548 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2549 /* This is bad. */ 2550 (void)snprintf(errmsg, sizeof errmsg, 2551 "Warning: cannot change pipe to PID %d to " 2552 "non-blocking behaviour.", 2553 (int)pid); 2554 logerror(errmsg); 2555 } 2556 *rpid = pid; 2557 return (pfd[1]); 2558 } 2559 2560 static void 2561 deadq_enter(pid_t pid, const char *name) 2562 { 2563 dq_t p; 2564 int status; 2565 2566 /* 2567 * Be paranoid, if we can't signal the process, don't enter it 2568 * into the dead queue (perhaps it's already dead). If possible, 2569 * we try to fetch and log the child's status. 2570 */ 2571 if (kill(pid, 0) != 0) { 2572 if (waitpid(pid, &status, WNOHANG) > 0) 2573 log_deadchild(pid, status, name); 2574 return; 2575 } 2576 2577 p = malloc(sizeof(struct deadq_entry)); 2578 if (p == NULL) { 2579 logerror("malloc"); 2580 exit(1); 2581 } 2582 2583 p->dq_pid = pid; 2584 p->dq_timeout = DQ_TIMO_INIT; 2585 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2586 } 2587 2588 static int 2589 deadq_remove(pid_t pid) 2590 { 2591 dq_t q; 2592 2593 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2594 if (q->dq_pid == pid) { 2595 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2596 free(q); 2597 return (1); 2598 } 2599 } 2600 2601 return (0); 2602 } 2603 2604 static void 2605 log_deadchild(pid_t pid, int status, const char *name) 2606 { 2607 int code; 2608 char buf[256]; 2609 const char *reason; 2610 2611 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2612 if (WIFSIGNALED(status)) { 2613 reason = "due to signal"; 2614 code = WTERMSIG(status); 2615 } else { 2616 reason = "with status"; 2617 code = WEXITSTATUS(status); 2618 if (code == 0) 2619 return; 2620 } 2621 (void)snprintf(buf, sizeof buf, 2622 "Logging subprocess %d (%s) exited %s %d.", 2623 pid, name, reason, code); 2624 logerror(buf); 2625 } 2626 2627 static int * 2628 socksetup(int af, char *bindhostname) 2629 { 2630 struct addrinfo hints, *res, *r; 2631 const char *bindservice; 2632 char *cp; 2633 int error, maxs, *s, *socks; 2634 2635 /* 2636 * We have to handle this case for backwards compatibility: 2637 * If there are two (or more) colons but no '[' and ']', 2638 * assume this is an inet6 address without a service. 2639 */ 2640 bindservice = "syslog"; 2641 if (bindhostname != NULL) { 2642 #ifdef INET6 2643 if (*bindhostname == '[' && 2644 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2645 ++bindhostname; 2646 *cp = '\0'; 2647 if (cp[1] == ':' && cp[2] != '\0') 2648 bindservice = cp + 2; 2649 } else { 2650 #endif 2651 cp = strchr(bindhostname, ':'); 2652 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2653 *cp = '\0'; 2654 if (cp[1] != '\0') 2655 bindservice = cp + 1; 2656 if (cp == bindhostname) 2657 bindhostname = NULL; 2658 } 2659 #ifdef INET6 2660 } 2661 #endif 2662 } 2663 2664 memset(&hints, 0, sizeof(hints)); 2665 hints.ai_flags = AI_PASSIVE; 2666 hints.ai_family = af; 2667 hints.ai_socktype = SOCK_DGRAM; 2668 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2669 if (error) { 2670 logerror(gai_strerror(error)); 2671 errno = 0; 2672 die(0); 2673 } 2674 2675 /* Count max number of sockets we may open */ 2676 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2677 socks = malloc((maxs+1) * sizeof(int)); 2678 if (socks == NULL) { 2679 logerror("couldn't allocate memory for sockets"); 2680 die(0); 2681 } 2682 2683 *socks = 0; /* num of sockets counter at start of array */ 2684 s = socks + 1; 2685 for (r = res; r; r = r->ai_next) { 2686 int on = 1; 2687 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2688 if (*s < 0) { 2689 logerror("socket"); 2690 continue; 2691 } 2692 #ifdef INET6 2693 if (r->ai_family == AF_INET6) { 2694 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2695 (char *)&on, sizeof (on)) < 0) { 2696 logerror("setsockopt"); 2697 close(*s); 2698 continue; 2699 } 2700 } 2701 #endif 2702 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2703 (char *)&on, sizeof (on)) < 0) { 2704 logerror("setsockopt"); 2705 close(*s); 2706 continue; 2707 } 2708 /* 2709 * RFC 3164 recommends that client side message 2710 * should come from the privileged syslogd port. 2711 * 2712 * If the system administrator choose not to obey 2713 * this, we can skip the bind() step so that the 2714 * system will choose a port for us. 2715 */ 2716 if (!NoBind) { 2717 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2718 logerror("bind"); 2719 close(*s); 2720 continue; 2721 } 2722 2723 if (!SecureMode) 2724 increase_rcvbuf(*s); 2725 } 2726 2727 (*socks)++; 2728 s++; 2729 } 2730 2731 if (*socks == 0) { 2732 free(socks); 2733 if (Debug) 2734 return (NULL); 2735 else 2736 die(0); 2737 } 2738 if (res) 2739 freeaddrinfo(res); 2740 2741 return (socks); 2742 } 2743 2744 static void 2745 increase_rcvbuf(int fd) 2746 { 2747 socklen_t len, slen; 2748 2749 slen = sizeof(len); 2750 2751 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2752 if (len < RCVBUF_MINSIZE) { 2753 len = RCVBUF_MINSIZE; 2754 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2755 } 2756 } 2757 } 2758