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 f->f_prevline && !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 if (f->f_prevline) { 1179 v->iov_base = f->f_prevline; 1180 v->iov_len = f->f_prevlen; 1181 } else { 1182 return; 1183 } 1184 v++; 1185 1186 dprintf("Logging to %s", TypeNames[f->f_type]); 1187 f->f_time = now; 1188 1189 switch (f->f_type) { 1190 int port; 1191 case F_UNUSED: 1192 dprintf("\n"); 1193 break; 1194 1195 case F_FORW: 1196 port = (int)ntohs(((struct sockaddr_in *) 1197 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1198 if (port != 514) { 1199 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1200 } else { 1201 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1202 } 1203 /* check for local vs remote messages */ 1204 if (strcasecmp(f->f_prevhost, LocalHostName)) 1205 l = snprintf(line, sizeof line - 1, 1206 "<%d>%.15s Forwarded from %s: %s", 1207 f->f_prevpri, (char *)iov[0].iov_base, 1208 f->f_prevhost, (char *)iov[5].iov_base); 1209 else 1210 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1211 f->f_prevpri, (char *)iov[0].iov_base, 1212 (char *)iov[5].iov_base); 1213 if (l < 0) 1214 l = 0; 1215 else if (l > MAXLINE) 1216 l = MAXLINE; 1217 1218 if (finet) { 1219 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1220 for (i = 0; i < *finet; i++) { 1221 #if 0 1222 /* 1223 * should we check AF first, or just 1224 * trial and error? FWD 1225 */ 1226 if (r->ai_family == 1227 address_family_of(finet[i+1])) 1228 #endif 1229 lsent = sendto(finet[i+1], line, l, 0, 1230 r->ai_addr, r->ai_addrlen); 1231 if (lsent == l) 1232 break; 1233 } 1234 if (lsent == l && !send_to_all) 1235 break; 1236 } 1237 dprintf("lsent/l: %d/%d\n", lsent, l); 1238 if (lsent != l) { 1239 int e = errno; 1240 logerror("sendto"); 1241 errno = e; 1242 switch (errno) { 1243 case ENOBUFS: 1244 case ENETDOWN: 1245 case ENETUNREACH: 1246 case EHOSTUNREACH: 1247 case EHOSTDOWN: 1248 case EADDRNOTAVAIL: 1249 break; 1250 /* case EBADF: */ 1251 /* case EACCES: */ 1252 /* case ENOTSOCK: */ 1253 /* case EFAULT: */ 1254 /* case EMSGSIZE: */ 1255 /* case EAGAIN: */ 1256 /* case ENOBUFS: */ 1257 /* case ECONNREFUSED: */ 1258 default: 1259 dprintf("removing entry: errno=%d\n", e); 1260 f->f_type = F_UNUSED; 1261 break; 1262 } 1263 } 1264 } 1265 break; 1266 1267 case F_FILE: 1268 dprintf(" %s\n", f->f_un.f_fname); 1269 v->iov_base = lf; 1270 v->iov_len = 1; 1271 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1272 /* 1273 * If writev(2) fails for potentially transient errors 1274 * like the filesystem being full, ignore it. 1275 * Otherwise remove this logfile from the list. 1276 */ 1277 if (errno != ENOSPC) { 1278 int e = errno; 1279 (void)close(f->f_file); 1280 f->f_type = F_UNUSED; 1281 errno = e; 1282 logerror(f->f_un.f_fname); 1283 } 1284 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1285 f->f_flags |= FFLAG_NEEDSYNC; 1286 needdofsync = 1; 1287 } 1288 break; 1289 1290 case F_PIPE: 1291 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1292 v->iov_base = lf; 1293 v->iov_len = 1; 1294 if (f->f_un.f_pipe.f_pid == 0) { 1295 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1296 &f->f_un.f_pipe.f_pid)) < 0) { 1297 f->f_type = F_UNUSED; 1298 logerror(f->f_un.f_pipe.f_pname); 1299 break; 1300 } 1301 } 1302 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1303 int e = errno; 1304 (void)close(f->f_file); 1305 if (f->f_un.f_pipe.f_pid > 0) 1306 deadq_enter(f->f_un.f_pipe.f_pid, 1307 f->f_un.f_pipe.f_pname); 1308 f->f_un.f_pipe.f_pid = 0; 1309 errno = e; 1310 logerror(f->f_un.f_pipe.f_pname); 1311 } 1312 break; 1313 1314 case F_CONSOLE: 1315 if (flags & IGN_CONS) { 1316 dprintf(" (ignored)\n"); 1317 break; 1318 } 1319 /* FALLTHROUGH */ 1320 1321 case F_TTY: 1322 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1323 v->iov_base = crlf; 1324 v->iov_len = 2; 1325 1326 errno = 0; /* ttymsg() only sometimes returns an errno */ 1327 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1328 f->f_type = F_UNUSED; 1329 logerror(msgret); 1330 } 1331 break; 1332 1333 case F_USERS: 1334 case F_WALL: 1335 dprintf("\n"); 1336 v->iov_base = crlf; 1337 v->iov_len = 2; 1338 wallmsg(f, iov, IOV_SIZE); 1339 break; 1340 } 1341 f->f_prevcount = 0; 1342 free(wmsg); 1343 } 1344 1345 /* 1346 * WALLMSG -- Write a message to the world at large 1347 * 1348 * Write the specified message to either the entire 1349 * world, or a list of approved users. 1350 */ 1351 static void 1352 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1353 { 1354 static int reenter; /* avoid calling ourselves */ 1355 struct utmpx *ut; 1356 int i; 1357 const char *p; 1358 1359 if (reenter++) 1360 return; 1361 setutxent(); 1362 /* NOSTRICT */ 1363 while ((ut = getutxent()) != NULL) { 1364 if (ut->ut_type != USER_PROCESS) 1365 continue; 1366 if (f->f_type == F_WALL) { 1367 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1368 TTYMSGTIME)) != NULL) { 1369 errno = 0; /* already in msg */ 1370 logerror(p); 1371 } 1372 continue; 1373 } 1374 /* should we send the message to this user? */ 1375 for (i = 0; i < MAXUNAMES; i++) { 1376 if (!f->f_un.f_uname[i][0]) 1377 break; 1378 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1379 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1380 TTYMSGTIME)) != NULL) { 1381 errno = 0; /* already in msg */ 1382 logerror(p); 1383 } 1384 break; 1385 } 1386 } 1387 } 1388 endutxent(); 1389 reenter = 0; 1390 } 1391 1392 static void 1393 reapchild(int signo __unused) 1394 { 1395 int status; 1396 pid_t pid; 1397 struct filed *f; 1398 1399 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1400 if (!Initialized) 1401 /* Don't tell while we are initting. */ 1402 continue; 1403 1404 /* First, look if it's a process from the dead queue. */ 1405 if (deadq_remove(pid)) 1406 goto oncemore; 1407 1408 /* Now, look in list of active processes. */ 1409 for (f = Files; f; f = f->f_next) 1410 if (f->f_type == F_PIPE && 1411 f->f_un.f_pipe.f_pid == pid) { 1412 (void)close(f->f_file); 1413 f->f_un.f_pipe.f_pid = 0; 1414 log_deadchild(pid, status, 1415 f->f_un.f_pipe.f_pname); 1416 break; 1417 } 1418 oncemore: 1419 continue; 1420 } 1421 } 1422 1423 /* 1424 * Return a printable representation of a host address. 1425 */ 1426 static const char * 1427 cvthname(struct sockaddr *f) 1428 { 1429 int error, hl; 1430 sigset_t omask, nmask; 1431 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1432 1433 error = getnameinfo((struct sockaddr *)f, 1434 ((struct sockaddr *)f)->sa_len, 1435 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1436 dprintf("cvthname(%s)\n", ip); 1437 1438 if (error) { 1439 dprintf("Malformed from address %s\n", gai_strerror(error)); 1440 return ("???"); 1441 } 1442 if (!resolve) 1443 return (ip); 1444 1445 sigemptyset(&nmask); 1446 sigaddset(&nmask, SIGHUP); 1447 sigprocmask(SIG_BLOCK, &nmask, &omask); 1448 error = getnameinfo((struct sockaddr *)f, 1449 ((struct sockaddr *)f)->sa_len, 1450 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1451 sigprocmask(SIG_SETMASK, &omask, NULL); 1452 if (error) { 1453 dprintf("Host name for your address (%s) unknown\n", ip); 1454 return (ip); 1455 } 1456 hl = strlen(hname); 1457 if (hl > 0 && hname[hl-1] == '.') 1458 hname[--hl] = '\0'; 1459 trimdomain(hname, hl); 1460 return (hname); 1461 } 1462 1463 static void 1464 dodie(int signo) 1465 { 1466 1467 WantDie = signo; 1468 } 1469 1470 static void 1471 domark(int signo __unused) 1472 { 1473 1474 MarkSet = 1; 1475 } 1476 1477 /* 1478 * Print syslogd errors some place. 1479 */ 1480 static void 1481 logerror(const char *type) 1482 { 1483 char buf[512]; 1484 static int recursed = 0; 1485 1486 /* If there's an error while trying to log an error, give up. */ 1487 if (recursed) 1488 return; 1489 recursed++; 1490 if (errno) 1491 (void)snprintf(buf, 1492 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1493 else 1494 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1495 errno = 0; 1496 dprintf("%s\n", buf); 1497 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1498 recursed--; 1499 } 1500 1501 static void 1502 die(int signo) 1503 { 1504 struct filed *f; 1505 struct funix *fx; 1506 int was_initialized; 1507 char buf[100]; 1508 1509 was_initialized = Initialized; 1510 Initialized = 0; /* Don't log SIGCHLDs. */ 1511 for (f = Files; f != NULL; f = f->f_next) { 1512 /* flush any pending output */ 1513 if (f->f_prevcount) 1514 fprintlog(f, 0, (char *)NULL); 1515 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1516 (void)close(f->f_file); 1517 f->f_un.f_pipe.f_pid = 0; 1518 } 1519 } 1520 Initialized = was_initialized; 1521 if (signo) { 1522 dprintf("syslogd: exiting on signal %d\n", signo); 1523 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1524 errno = 0; 1525 logerror(buf); 1526 } 1527 STAILQ_FOREACH(fx, &funixes, next) 1528 (void)unlink(fx->name); 1529 pidfile_remove(pfh); 1530 1531 exit(1); 1532 } 1533 1534 /* 1535 * INIT -- Initialize syslogd from configuration table 1536 */ 1537 static void 1538 init(int signo) 1539 { 1540 int i; 1541 FILE *cf; 1542 struct filed *f, *next, **nextp; 1543 char *p; 1544 char cline[LINE_MAX]; 1545 char prog[NAME_MAX+1]; 1546 char host[MAXHOSTNAMELEN]; 1547 char oldLocalHostName[MAXHOSTNAMELEN]; 1548 char hostMsg[2*MAXHOSTNAMELEN+40]; 1549 char bootfileMsg[LINE_MAX]; 1550 1551 dprintf("init\n"); 1552 1553 /* 1554 * Load hostname (may have changed). 1555 */ 1556 if (signo != 0) 1557 (void)strlcpy(oldLocalHostName, LocalHostName, 1558 sizeof(oldLocalHostName)); 1559 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1560 err(EX_OSERR, "gethostname() failed"); 1561 if ((p = strchr(LocalHostName, '.')) != NULL) { 1562 *p++ = '\0'; 1563 LocalDomain = p; 1564 } else { 1565 LocalDomain = ""; 1566 } 1567 1568 /* 1569 * Close all open log files. 1570 */ 1571 Initialized = 0; 1572 for (f = Files; f != NULL; f = next) { 1573 /* flush any pending output */ 1574 if (f->f_prevcount) 1575 fprintlog(f, 0, (char *)NULL); 1576 1577 switch (f->f_type) { 1578 case F_FILE: 1579 case F_FORW: 1580 case F_CONSOLE: 1581 case F_TTY: 1582 (void)close(f->f_file); 1583 break; 1584 case F_PIPE: 1585 if (f->f_un.f_pipe.f_pid > 0) { 1586 (void)close(f->f_file); 1587 deadq_enter(f->f_un.f_pipe.f_pid, 1588 f->f_un.f_pipe.f_pname); 1589 } 1590 f->f_un.f_pipe.f_pid = 0; 1591 break; 1592 } 1593 next = f->f_next; 1594 if (f->f_program) free(f->f_program); 1595 if (f->f_host) free(f->f_host); 1596 free((char *)f); 1597 } 1598 Files = NULL; 1599 nextp = &Files; 1600 1601 /* open the configuration file */ 1602 if ((cf = fopen(ConfFile, "r")) == NULL) { 1603 dprintf("cannot open %s\n", ConfFile); 1604 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1605 if (*nextp == NULL) { 1606 logerror("calloc"); 1607 exit(1); 1608 } 1609 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1610 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1611 if ((*nextp)->f_next == NULL) { 1612 logerror("calloc"); 1613 exit(1); 1614 } 1615 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1616 Initialized = 1; 1617 return; 1618 } 1619 1620 /* 1621 * Foreach line in the conf table, open that file. 1622 */ 1623 f = NULL; 1624 (void)strlcpy(host, "*", sizeof(host)); 1625 (void)strlcpy(prog, "*", sizeof(prog)); 1626 while (fgets(cline, sizeof(cline), cf) != NULL) { 1627 /* 1628 * check for end-of-section, comments, strip off trailing 1629 * spaces and newline character. #!prog is treated specially: 1630 * following lines apply only to that program. 1631 */ 1632 for (p = cline; isspace(*p); ++p) 1633 continue; 1634 if (*p == 0) 1635 continue; 1636 if (*p == '#') { 1637 p++; 1638 if (*p != '!' && *p != '+' && *p != '-') 1639 continue; 1640 } 1641 if (*p == '+' || *p == '-') { 1642 host[0] = *p++; 1643 while (isspace(*p)) 1644 p++; 1645 if ((!*p) || (*p == '*')) { 1646 (void)strlcpy(host, "*", sizeof(host)); 1647 continue; 1648 } 1649 if (*p == '@') 1650 p = LocalHostName; 1651 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1652 if (!isalnum(*p) && *p != '.' && *p != '-' 1653 && *p != ',' && *p != ':' && *p != '%') 1654 break; 1655 host[i] = *p++; 1656 } 1657 host[i] = '\0'; 1658 continue; 1659 } 1660 if (*p == '!') { 1661 p++; 1662 while (isspace(*p)) p++; 1663 if ((!*p) || (*p == '*')) { 1664 (void)strlcpy(prog, "*", sizeof(prog)); 1665 continue; 1666 } 1667 for (i = 0; i < NAME_MAX; i++) { 1668 if (!isprint(p[i]) || isspace(p[i])) 1669 break; 1670 prog[i] = p[i]; 1671 } 1672 prog[i] = 0; 1673 continue; 1674 } 1675 for (p = cline + 1; *p != '\0'; p++) { 1676 if (*p != '#') 1677 continue; 1678 if (*(p - 1) == '\\') { 1679 strcpy(p - 1, p); 1680 p--; 1681 continue; 1682 } 1683 *p = '\0'; 1684 break; 1685 } 1686 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1687 cline[i] = '\0'; 1688 f = (struct filed *)calloc(1, sizeof(*f)); 1689 if (f == NULL) { 1690 logerror("calloc"); 1691 exit(1); 1692 } 1693 *nextp = f; 1694 nextp = &f->f_next; 1695 cfline(cline, f, prog, host); 1696 } 1697 1698 /* close the configuration file */ 1699 (void)fclose(cf); 1700 1701 Initialized = 1; 1702 1703 if (Debug) { 1704 int port; 1705 for (f = Files; f; f = f->f_next) { 1706 for (i = 0; i <= LOG_NFACILITIES; i++) 1707 if (f->f_pmask[i] == INTERNAL_NOPRI) 1708 printf("X "); 1709 else 1710 printf("%d ", f->f_pmask[i]); 1711 printf("%s: ", TypeNames[f->f_type]); 1712 switch (f->f_type) { 1713 case F_FILE: 1714 printf("%s", f->f_un.f_fname); 1715 break; 1716 1717 case F_CONSOLE: 1718 case F_TTY: 1719 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1720 break; 1721 1722 case F_FORW: 1723 port = (int)ntohs(((struct sockaddr_in *) 1724 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1725 if (port != 514) { 1726 printf("%s:%d", 1727 f->f_un.f_forw.f_hname, port); 1728 } else { 1729 printf("%s", f->f_un.f_forw.f_hname); 1730 } 1731 break; 1732 1733 case F_PIPE: 1734 printf("%s", f->f_un.f_pipe.f_pname); 1735 break; 1736 1737 case F_USERS: 1738 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1739 printf("%s, ", f->f_un.f_uname[i]); 1740 break; 1741 } 1742 if (f->f_program) 1743 printf(" (%s)", f->f_program); 1744 printf("\n"); 1745 } 1746 } 1747 1748 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1749 dprintf("syslogd: restarted\n"); 1750 /* 1751 * Log a change in hostname, but only on a restart. 1752 */ 1753 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1754 (void)snprintf(hostMsg, sizeof(hostMsg), 1755 "syslogd: hostname changed, \"%s\" to \"%s\"", 1756 oldLocalHostName, LocalHostName); 1757 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1758 dprintf("%s\n", hostMsg); 1759 } 1760 /* 1761 * Log the kernel boot file if we aren't going to use it as 1762 * the prefix, and if this is *not* a restart. 1763 */ 1764 if (signo == 0 && !use_bootfile) { 1765 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1766 "syslogd: kernel boot file is %s", bootfile); 1767 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1768 dprintf("%s\n", bootfileMsg); 1769 } 1770 } 1771 1772 /* 1773 * Crack a configuration file line 1774 */ 1775 static void 1776 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1777 { 1778 struct addrinfo hints, *res; 1779 int error, i, pri, syncfile; 1780 const char *p, *q; 1781 char *bp; 1782 char buf[MAXLINE], ebuf[100]; 1783 1784 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1785 1786 errno = 0; /* keep strerror() stuff out of logerror messages */ 1787 1788 /* clear out file entry */ 1789 memset(f, 0, sizeof(*f)); 1790 for (i = 0; i <= LOG_NFACILITIES; i++) 1791 f->f_pmask[i] = INTERNAL_NOPRI; 1792 1793 /* save hostname if any */ 1794 if (host && *host == '*') 1795 host = NULL; 1796 if (host) { 1797 int hl; 1798 1799 f->f_host = strdup(host); 1800 if (f->f_host == NULL) { 1801 logerror("strdup"); 1802 exit(1); 1803 } 1804 hl = strlen(f->f_host); 1805 if (hl > 0 && f->f_host[hl-1] == '.') 1806 f->f_host[--hl] = '\0'; 1807 trimdomain(f->f_host, hl); 1808 } 1809 1810 /* save program name if any */ 1811 if (prog && *prog == '*') 1812 prog = NULL; 1813 if (prog) { 1814 f->f_program = strdup(prog); 1815 if (f->f_program == NULL) { 1816 logerror("strdup"); 1817 exit(1); 1818 } 1819 } 1820 1821 /* scan through the list of selectors */ 1822 for (p = line; *p && *p != '\t' && *p != ' ';) { 1823 int pri_done; 1824 int pri_cmp; 1825 int pri_invert; 1826 1827 /* find the end of this facility name list */ 1828 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1829 continue; 1830 1831 /* get the priority comparison */ 1832 pri_cmp = 0; 1833 pri_done = 0; 1834 pri_invert = 0; 1835 if (*q == '!') { 1836 pri_invert = 1; 1837 q++; 1838 } 1839 while (!pri_done) { 1840 switch (*q) { 1841 case '<': 1842 pri_cmp |= PRI_LT; 1843 q++; 1844 break; 1845 case '=': 1846 pri_cmp |= PRI_EQ; 1847 q++; 1848 break; 1849 case '>': 1850 pri_cmp |= PRI_GT; 1851 q++; 1852 break; 1853 default: 1854 pri_done++; 1855 break; 1856 } 1857 } 1858 1859 /* collect priority name */ 1860 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1861 *bp++ = *q++; 1862 *bp = '\0'; 1863 1864 /* skip cruft */ 1865 while (strchr(",;", *q)) 1866 q++; 1867 1868 /* decode priority name */ 1869 if (*buf == '*') { 1870 pri = LOG_PRIMASK; 1871 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1872 } else { 1873 /* Ignore trailing spaces. */ 1874 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1875 buf[i] = '\0'; 1876 1877 pri = decode(buf, prioritynames); 1878 if (pri < 0) { 1879 errno = 0; 1880 (void)snprintf(ebuf, sizeof ebuf, 1881 "unknown priority name \"%s\"", buf); 1882 logerror(ebuf); 1883 return; 1884 } 1885 } 1886 if (!pri_cmp) 1887 pri_cmp = (UniquePriority) 1888 ? (PRI_EQ) 1889 : (PRI_EQ | PRI_GT) 1890 ; 1891 if (pri_invert) 1892 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1893 1894 /* scan facilities */ 1895 while (*p && !strchr("\t.; ", *p)) { 1896 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1897 *bp++ = *p++; 1898 *bp = '\0'; 1899 1900 if (*buf == '*') { 1901 for (i = 0; i < LOG_NFACILITIES; i++) { 1902 f->f_pmask[i] = pri; 1903 f->f_pcmp[i] = pri_cmp; 1904 } 1905 } else { 1906 i = decode(buf, facilitynames); 1907 if (i < 0) { 1908 errno = 0; 1909 (void)snprintf(ebuf, sizeof ebuf, 1910 "unknown facility name \"%s\"", 1911 buf); 1912 logerror(ebuf); 1913 return; 1914 } 1915 f->f_pmask[i >> 3] = pri; 1916 f->f_pcmp[i >> 3] = pri_cmp; 1917 } 1918 while (*p == ',' || *p == ' ') 1919 p++; 1920 } 1921 1922 p = q; 1923 } 1924 1925 /* skip to action part */ 1926 while (*p == '\t' || *p == ' ') 1927 p++; 1928 1929 if (*p == '-') { 1930 syncfile = 0; 1931 p++; 1932 } else 1933 syncfile = 1; 1934 1935 switch (*p) { 1936 case '@': 1937 { 1938 char *tp; 1939 char endkey = ':'; 1940 /* 1941 * scan forward to see if there is a port defined. 1942 * so we can't use strlcpy.. 1943 */ 1944 i = sizeof(f->f_un.f_forw.f_hname); 1945 tp = f->f_un.f_forw.f_hname; 1946 p++; 1947 1948 /* 1949 * an ipv6 address should start with a '[' in that case 1950 * we should scan for a ']' 1951 */ 1952 if (*p == '[') { 1953 p++; 1954 endkey = ']'; 1955 } 1956 while (*p && (*p != endkey) && (i-- > 0)) { 1957 *tp++ = *p++; 1958 } 1959 if (endkey == ']' && *p == endkey) 1960 p++; 1961 *tp = '\0'; 1962 } 1963 /* See if we copied a domain and have a port */ 1964 if (*p == ':') 1965 p++; 1966 else 1967 p = NULL; 1968 1969 memset(&hints, 0, sizeof(hints)); 1970 hints.ai_family = family; 1971 hints.ai_socktype = SOCK_DGRAM; 1972 error = getaddrinfo(f->f_un.f_forw.f_hname, 1973 p ? p : "syslog", &hints, &res); 1974 if (error) { 1975 logerror(gai_strerror(error)); 1976 break; 1977 } 1978 f->f_un.f_forw.f_addr = res; 1979 f->f_type = F_FORW; 1980 break; 1981 1982 case '/': 1983 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1984 f->f_type = F_UNUSED; 1985 logerror(p); 1986 break; 1987 } 1988 if (syncfile) 1989 f->f_flags |= FFLAG_SYNC; 1990 if (isatty(f->f_file)) { 1991 if (strcmp(p, ctty) == 0) 1992 f->f_type = F_CONSOLE; 1993 else 1994 f->f_type = F_TTY; 1995 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1996 sizeof(f->f_un.f_fname)); 1997 } else { 1998 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1999 f->f_type = F_FILE; 2000 } 2001 break; 2002 2003 case '|': 2004 f->f_un.f_pipe.f_pid = 0; 2005 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2006 sizeof(f->f_un.f_pipe.f_pname)); 2007 f->f_type = F_PIPE; 2008 break; 2009 2010 case '*': 2011 f->f_type = F_WALL; 2012 break; 2013 2014 default: 2015 for (i = 0; i < MAXUNAMES && *p; i++) { 2016 for (q = p; *q && *q != ','; ) 2017 q++; 2018 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2019 if ((q - p) >= MAXLOGNAME) 2020 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2021 else 2022 f->f_un.f_uname[i][q - p] = '\0'; 2023 while (*q == ',' || *q == ' ') 2024 q++; 2025 p = q; 2026 } 2027 f->f_type = F_USERS; 2028 break; 2029 } 2030 } 2031 2032 2033 /* 2034 * Decode a symbolic name to a numeric value 2035 */ 2036 static int 2037 decode(const char *name, const CODE *codetab) 2038 { 2039 const CODE *c; 2040 char *p, buf[40]; 2041 2042 if (isdigit(*name)) 2043 return (atoi(name)); 2044 2045 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2046 if (isupper(*name)) 2047 *p = tolower(*name); 2048 else 2049 *p = *name; 2050 } 2051 *p = '\0'; 2052 for (c = codetab; c->c_name; c++) 2053 if (!strcmp(buf, c->c_name)) 2054 return (c->c_val); 2055 2056 return (-1); 2057 } 2058 2059 static void 2060 markit(void) 2061 { 2062 struct filed *f; 2063 dq_t q, next; 2064 2065 now = time((time_t *)NULL); 2066 MarkSeq += TIMERINTVL; 2067 if (MarkSeq >= MarkInterval) { 2068 logmsg(LOG_INFO, "-- MARK --", 2069 LocalHostName, ADDDATE|MARK); 2070 MarkSeq = 0; 2071 } 2072 2073 for (f = Files; f; f = f->f_next) { 2074 if (f->f_prevcount && now >= REPEATTIME(f)) { 2075 dprintf("flush %s: repeated %d times, %d sec.\n", 2076 TypeNames[f->f_type], f->f_prevcount, 2077 repeatinterval[f->f_repeatcount]); 2078 fprintlog(f, 0, (char *)NULL); 2079 BACKOFF(f); 2080 } 2081 } 2082 2083 /* Walk the dead queue, and see if we should signal somebody. */ 2084 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2085 next = TAILQ_NEXT(q, dq_entries); 2086 2087 switch (q->dq_timeout) { 2088 case 0: 2089 /* Already signalled once, try harder now. */ 2090 if (kill(q->dq_pid, SIGKILL) != 0) 2091 (void)deadq_remove(q->dq_pid); 2092 break; 2093 2094 case 1: 2095 /* 2096 * Timed out on dead queue, send terminate 2097 * signal. Note that we leave the removal 2098 * from the dead queue to reapchild(), which 2099 * will also log the event (unless the process 2100 * didn't even really exist, in case we simply 2101 * drop it from the dead queue). 2102 */ 2103 if (kill(q->dq_pid, SIGTERM) != 0) 2104 (void)deadq_remove(q->dq_pid); 2105 /* FALLTHROUGH */ 2106 2107 default: 2108 q->dq_timeout--; 2109 } 2110 } 2111 MarkSet = 0; 2112 (void)alarm(TIMERINTVL); 2113 } 2114 2115 /* 2116 * fork off and become a daemon, but wait for the child to come online 2117 * before returing to the parent, or we get disk thrashing at boot etc. 2118 * Set a timer so we don't hang forever if it wedges. 2119 */ 2120 static int 2121 waitdaemon(int nochdir, int noclose, int maxwait) 2122 { 2123 int fd; 2124 int status; 2125 pid_t pid, childpid; 2126 2127 switch (childpid = fork()) { 2128 case -1: 2129 return (-1); 2130 case 0: 2131 break; 2132 default: 2133 signal(SIGALRM, timedout); 2134 alarm(maxwait); 2135 while ((pid = wait3(&status, 0, NULL)) != -1) { 2136 if (WIFEXITED(status)) 2137 errx(1, "child pid %d exited with return code %d", 2138 pid, WEXITSTATUS(status)); 2139 if (WIFSIGNALED(status)) 2140 errx(1, "child pid %d exited on signal %d%s", 2141 pid, WTERMSIG(status), 2142 WCOREDUMP(status) ? " (core dumped)" : 2143 ""); 2144 if (pid == childpid) /* it's gone... */ 2145 break; 2146 } 2147 exit(0); 2148 } 2149 2150 if (setsid() == -1) 2151 return (-1); 2152 2153 if (!nochdir) 2154 (void)chdir("/"); 2155 2156 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2157 (void)dup2(fd, STDIN_FILENO); 2158 (void)dup2(fd, STDOUT_FILENO); 2159 (void)dup2(fd, STDERR_FILENO); 2160 if (fd > 2) 2161 (void)close (fd); 2162 } 2163 return (getppid()); 2164 } 2165 2166 /* 2167 * We get a SIGALRM from the child when it's running and finished doing it's 2168 * fsync()'s or O_SYNC writes for all the boot messages. 2169 * 2170 * We also get a signal from the kernel if the timer expires, so check to 2171 * see what happened. 2172 */ 2173 static void 2174 timedout(int sig __unused) 2175 { 2176 int left; 2177 left = alarm(0); 2178 signal(SIGALRM, SIG_DFL); 2179 if (left == 0) 2180 errx(1, "timed out waiting for child"); 2181 else 2182 _exit(0); 2183 } 2184 2185 /* 2186 * Add `s' to the list of allowable peer addresses to accept messages 2187 * from. 2188 * 2189 * `s' is a string in the form: 2190 * 2191 * [*]domainname[:{servicename|portnumber|*}] 2192 * 2193 * or 2194 * 2195 * netaddr/maskbits[:{servicename|portnumber|*}] 2196 * 2197 * Returns -1 on error, 0 if the argument was valid. 2198 */ 2199 static int 2200 allowaddr(char *s) 2201 { 2202 char *cp1, *cp2; 2203 struct allowedpeer ap; 2204 struct servent *se; 2205 int masklen = -1; 2206 struct addrinfo hints, *res; 2207 struct in_addr *addrp, *maskp; 2208 #ifdef INET6 2209 int i; 2210 u_int32_t *addr6p, *mask6p; 2211 #endif 2212 char ip[NI_MAXHOST]; 2213 2214 #ifdef INET6 2215 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2216 #endif 2217 cp1 = s; 2218 if ((cp1 = strrchr(cp1, ':'))) { 2219 /* service/port provided */ 2220 *cp1++ = '\0'; 2221 if (strlen(cp1) == 1 && *cp1 == '*') 2222 /* any port allowed */ 2223 ap.port = 0; 2224 else if ((se = getservbyname(cp1, "udp"))) { 2225 ap.port = ntohs(se->s_port); 2226 } else { 2227 ap.port = strtol(cp1, &cp2, 0); 2228 if (*cp2 != '\0') 2229 return (-1); /* port not numeric */ 2230 } 2231 } else { 2232 if ((se = getservbyname("syslog", "udp"))) 2233 ap.port = ntohs(se->s_port); 2234 else 2235 /* sanity, should not happen */ 2236 ap.port = 514; 2237 } 2238 2239 if ((cp1 = strchr(s, '/')) != NULL && 2240 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2241 *cp1 = '\0'; 2242 if ((masklen = atoi(cp1 + 1)) < 0) 2243 return (-1); 2244 } 2245 #ifdef INET6 2246 if (*s == '[') { 2247 cp2 = s + strlen(s) - 1; 2248 if (*cp2 == ']') { 2249 ++s; 2250 *cp2 = '\0'; 2251 } else { 2252 cp2 = NULL; 2253 } 2254 } else { 2255 cp2 = NULL; 2256 } 2257 #endif 2258 memset(&hints, 0, sizeof(hints)); 2259 hints.ai_family = PF_UNSPEC; 2260 hints.ai_socktype = SOCK_DGRAM; 2261 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2262 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2263 ap.isnumeric = 1; 2264 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2265 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2266 ap.a_mask.ss_family = res->ai_family; 2267 if (res->ai_family == AF_INET) { 2268 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2269 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2270 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2271 if (masklen < 0) { 2272 /* use default netmask */ 2273 if (IN_CLASSA(ntohl(addrp->s_addr))) 2274 maskp->s_addr = htonl(IN_CLASSA_NET); 2275 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2276 maskp->s_addr = htonl(IN_CLASSB_NET); 2277 else 2278 maskp->s_addr = htonl(IN_CLASSC_NET); 2279 } else if (masklen <= 32) { 2280 /* convert masklen to netmask */ 2281 if (masklen == 0) 2282 maskp->s_addr = 0; 2283 else 2284 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2285 } else { 2286 freeaddrinfo(res); 2287 return (-1); 2288 } 2289 /* Lose any host bits in the network number. */ 2290 addrp->s_addr &= maskp->s_addr; 2291 } 2292 #ifdef INET6 2293 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2294 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2295 if (masklen < 0) 2296 masklen = 128; 2297 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2298 /* convert masklen to netmask */ 2299 while (masklen > 0) { 2300 if (masklen < 32) { 2301 *mask6p = htonl(~(0xffffffff >> masklen)); 2302 break; 2303 } 2304 *mask6p++ = 0xffffffff; 2305 masklen -= 32; 2306 } 2307 /* Lose any host bits in the network number. */ 2308 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2309 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2310 for (i = 0; i < 4; i++) 2311 addr6p[i] &= mask6p[i]; 2312 } 2313 #endif 2314 else { 2315 freeaddrinfo(res); 2316 return (-1); 2317 } 2318 freeaddrinfo(res); 2319 } else { 2320 /* arg `s' is domain name */ 2321 ap.isnumeric = 0; 2322 ap.a_name = s; 2323 if (cp1) 2324 *cp1 = '/'; 2325 #ifdef INET6 2326 if (cp2) { 2327 *cp2 = ']'; 2328 --s; 2329 } 2330 #endif 2331 } 2332 2333 if (Debug) { 2334 printf("allowaddr: rule %d: ", NumAllowed); 2335 if (ap.isnumeric) { 2336 printf("numeric, "); 2337 getnameinfo((struct sockaddr *)&ap.a_addr, 2338 ((struct sockaddr *)&ap.a_addr)->sa_len, 2339 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2340 printf("addr = %s, ", ip); 2341 getnameinfo((struct sockaddr *)&ap.a_mask, 2342 ((struct sockaddr *)&ap.a_mask)->sa_len, 2343 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2344 printf("mask = %s; ", ip); 2345 } else { 2346 printf("domainname = %s; ", ap.a_name); 2347 } 2348 printf("port = %d\n", ap.port); 2349 } 2350 2351 if ((AllowedPeers = realloc(AllowedPeers, 2352 ++NumAllowed * sizeof(struct allowedpeer))) 2353 == NULL) { 2354 logerror("realloc"); 2355 exit(1); 2356 } 2357 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2358 return (0); 2359 } 2360 2361 /* 2362 * Validate that the remote peer has permission to log to us. 2363 */ 2364 static int 2365 validate(struct sockaddr *sa, const char *hname) 2366 { 2367 int i; 2368 size_t l1, l2; 2369 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2370 struct allowedpeer *ap; 2371 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2372 #ifdef INET6 2373 int j, reject; 2374 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2375 #endif 2376 struct addrinfo hints, *res; 2377 u_short sport; 2378 2379 if (NumAllowed == 0) 2380 /* traditional behaviour, allow everything */ 2381 return (1); 2382 2383 (void)strlcpy(name, hname, sizeof(name)); 2384 memset(&hints, 0, sizeof(hints)); 2385 hints.ai_family = PF_UNSPEC; 2386 hints.ai_socktype = SOCK_DGRAM; 2387 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2388 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2389 freeaddrinfo(res); 2390 else if (strchr(name, '.') == NULL) { 2391 strlcat(name, ".", sizeof name); 2392 strlcat(name, LocalDomain, sizeof name); 2393 } 2394 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2395 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2396 return (0); /* for safety, should not occur */ 2397 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2398 ip, port, name); 2399 sport = atoi(port); 2400 2401 /* now, walk down the list */ 2402 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2403 if (ap->port != 0 && ap->port != sport) { 2404 dprintf("rejected in rule %d due to port mismatch.\n", i); 2405 continue; 2406 } 2407 2408 if (ap->isnumeric) { 2409 if (ap->a_addr.ss_family != sa->sa_family) { 2410 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2411 continue; 2412 } 2413 if (ap->a_addr.ss_family == AF_INET) { 2414 sin4 = (struct sockaddr_in *)sa; 2415 a4p = (struct sockaddr_in *)&ap->a_addr; 2416 m4p = (struct sockaddr_in *)&ap->a_mask; 2417 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2418 != a4p->sin_addr.s_addr) { 2419 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2420 continue; 2421 } 2422 } 2423 #ifdef INET6 2424 else if (ap->a_addr.ss_family == AF_INET6) { 2425 sin6 = (struct sockaddr_in6 *)sa; 2426 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2427 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2428 if (a6p->sin6_scope_id != 0 && 2429 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2430 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2431 continue; 2432 } 2433 reject = 0; 2434 for (j = 0; j < 16; j += 4) { 2435 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2436 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2437 ++reject; 2438 break; 2439 } 2440 } 2441 if (reject) { 2442 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2443 continue; 2444 } 2445 } 2446 #endif 2447 else 2448 continue; 2449 } else { 2450 cp = ap->a_name; 2451 l1 = strlen(name); 2452 if (*cp == '*') { 2453 /* allow wildmatch */ 2454 cp++; 2455 l2 = strlen(cp); 2456 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2457 dprintf("rejected in rule %d due to name mismatch.\n", i); 2458 continue; 2459 } 2460 } else { 2461 /* exact match */ 2462 l2 = strlen(cp); 2463 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2464 dprintf("rejected in rule %d due to name mismatch.\n", i); 2465 continue; 2466 } 2467 } 2468 } 2469 dprintf("accepted in rule %d.\n", i); 2470 return (1); /* hooray! */ 2471 } 2472 return (0); 2473 } 2474 2475 /* 2476 * Fairly similar to popen(3), but returns an open descriptor, as 2477 * opposed to a FILE *. 2478 */ 2479 static int 2480 p_open(const char *prog, pid_t *rpid) 2481 { 2482 int pfd[2], nulldesc; 2483 pid_t pid; 2484 sigset_t omask, mask; 2485 char *argv[4]; /* sh -c cmd NULL */ 2486 char errmsg[200]; 2487 2488 if (pipe(pfd) == -1) 2489 return (-1); 2490 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2491 /* we are royally screwed anyway */ 2492 return (-1); 2493 2494 sigemptyset(&mask); 2495 sigaddset(&mask, SIGALRM); 2496 sigaddset(&mask, SIGHUP); 2497 sigprocmask(SIG_BLOCK, &mask, &omask); 2498 switch ((pid = fork())) { 2499 case -1: 2500 sigprocmask(SIG_SETMASK, &omask, 0); 2501 close(nulldesc); 2502 return (-1); 2503 2504 case 0: 2505 argv[0] = strdup("sh"); 2506 argv[1] = strdup("-c"); 2507 argv[2] = strdup(prog); 2508 argv[3] = NULL; 2509 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2510 logerror("strdup"); 2511 exit(1); 2512 } 2513 2514 alarm(0); 2515 (void)setsid(); /* Avoid catching SIGHUPs. */ 2516 2517 /* 2518 * Throw away pending signals, and reset signal 2519 * behaviour to standard values. 2520 */ 2521 signal(SIGALRM, SIG_IGN); 2522 signal(SIGHUP, SIG_IGN); 2523 sigprocmask(SIG_SETMASK, &omask, 0); 2524 signal(SIGPIPE, SIG_DFL); 2525 signal(SIGQUIT, SIG_DFL); 2526 signal(SIGALRM, SIG_DFL); 2527 signal(SIGHUP, SIG_DFL); 2528 2529 dup2(pfd[0], STDIN_FILENO); 2530 dup2(nulldesc, STDOUT_FILENO); 2531 dup2(nulldesc, STDERR_FILENO); 2532 closefrom(3); 2533 2534 (void)execvp(_PATH_BSHELL, argv); 2535 _exit(255); 2536 } 2537 2538 sigprocmask(SIG_SETMASK, &omask, 0); 2539 close(nulldesc); 2540 close(pfd[0]); 2541 /* 2542 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2543 * supposed to get an EWOULDBLOCK on writev(2), which is 2544 * caught by the logic above anyway, which will in turn close 2545 * the pipe, and fork a new logging subprocess if necessary. 2546 * The stale subprocess will be killed some time later unless 2547 * it terminated itself due to closing its input pipe (so we 2548 * get rid of really dead puppies). 2549 */ 2550 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2551 /* This is bad. */ 2552 (void)snprintf(errmsg, sizeof errmsg, 2553 "Warning: cannot change pipe to PID %d to " 2554 "non-blocking behaviour.", 2555 (int)pid); 2556 logerror(errmsg); 2557 } 2558 *rpid = pid; 2559 return (pfd[1]); 2560 } 2561 2562 static void 2563 deadq_enter(pid_t pid, const char *name) 2564 { 2565 dq_t p; 2566 int status; 2567 2568 /* 2569 * Be paranoid, if we can't signal the process, don't enter it 2570 * into the dead queue (perhaps it's already dead). If possible, 2571 * we try to fetch and log the child's status. 2572 */ 2573 if (kill(pid, 0) != 0) { 2574 if (waitpid(pid, &status, WNOHANG) > 0) 2575 log_deadchild(pid, status, name); 2576 return; 2577 } 2578 2579 p = malloc(sizeof(struct deadq_entry)); 2580 if (p == NULL) { 2581 logerror("malloc"); 2582 exit(1); 2583 } 2584 2585 p->dq_pid = pid; 2586 p->dq_timeout = DQ_TIMO_INIT; 2587 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2588 } 2589 2590 static int 2591 deadq_remove(pid_t pid) 2592 { 2593 dq_t q; 2594 2595 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2596 if (q->dq_pid == pid) { 2597 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2598 free(q); 2599 return (1); 2600 } 2601 } 2602 2603 return (0); 2604 } 2605 2606 static void 2607 log_deadchild(pid_t pid, int status, const char *name) 2608 { 2609 int code; 2610 char buf[256]; 2611 const char *reason; 2612 2613 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2614 if (WIFSIGNALED(status)) { 2615 reason = "due to signal"; 2616 code = WTERMSIG(status); 2617 } else { 2618 reason = "with status"; 2619 code = WEXITSTATUS(status); 2620 if (code == 0) 2621 return; 2622 } 2623 (void)snprintf(buf, sizeof buf, 2624 "Logging subprocess %d (%s) exited %s %d.", 2625 pid, name, reason, code); 2626 logerror(buf); 2627 } 2628 2629 static int * 2630 socksetup(int af, char *bindhostname) 2631 { 2632 struct addrinfo hints, *res, *r; 2633 const char *bindservice; 2634 char *cp; 2635 int error, maxs, *s, *socks; 2636 2637 /* 2638 * We have to handle this case for backwards compatibility: 2639 * If there are two (or more) colons but no '[' and ']', 2640 * assume this is an inet6 address without a service. 2641 */ 2642 bindservice = "syslog"; 2643 if (bindhostname != NULL) { 2644 #ifdef INET6 2645 if (*bindhostname == '[' && 2646 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2647 ++bindhostname; 2648 *cp = '\0'; 2649 if (cp[1] == ':' && cp[2] != '\0') 2650 bindservice = cp + 2; 2651 } else { 2652 #endif 2653 cp = strchr(bindhostname, ':'); 2654 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2655 *cp = '\0'; 2656 if (cp[1] != '\0') 2657 bindservice = cp + 1; 2658 if (cp == bindhostname) 2659 bindhostname = NULL; 2660 } 2661 #ifdef INET6 2662 } 2663 #endif 2664 } 2665 2666 memset(&hints, 0, sizeof(hints)); 2667 hints.ai_flags = AI_PASSIVE; 2668 hints.ai_family = af; 2669 hints.ai_socktype = SOCK_DGRAM; 2670 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2671 if (error) { 2672 logerror(gai_strerror(error)); 2673 errno = 0; 2674 die(0); 2675 } 2676 2677 /* Count max number of sockets we may open */ 2678 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2679 socks = malloc((maxs+1) * sizeof(int)); 2680 if (socks == NULL) { 2681 logerror("couldn't allocate memory for sockets"); 2682 die(0); 2683 } 2684 2685 *socks = 0; /* num of sockets counter at start of array */ 2686 s = socks + 1; 2687 for (r = res; r; r = r->ai_next) { 2688 int on = 1; 2689 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2690 if (*s < 0) { 2691 logerror("socket"); 2692 continue; 2693 } 2694 #ifdef INET6 2695 if (r->ai_family == AF_INET6) { 2696 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2697 (char *)&on, sizeof (on)) < 0) { 2698 logerror("setsockopt"); 2699 close(*s); 2700 continue; 2701 } 2702 } 2703 #endif 2704 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2705 (char *)&on, sizeof (on)) < 0) { 2706 logerror("setsockopt"); 2707 close(*s); 2708 continue; 2709 } 2710 /* 2711 * RFC 3164 recommends that client side message 2712 * should come from the privileged syslogd port. 2713 * 2714 * If the system administrator choose not to obey 2715 * this, we can skip the bind() step so that the 2716 * system will choose a port for us. 2717 */ 2718 if (!NoBind) { 2719 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2720 logerror("bind"); 2721 close(*s); 2722 continue; 2723 } 2724 2725 if (!SecureMode) 2726 increase_rcvbuf(*s); 2727 } 2728 2729 (*socks)++; 2730 s++; 2731 } 2732 2733 if (*socks == 0) { 2734 free(socks); 2735 if (Debug) 2736 return (NULL); 2737 else 2738 die(0); 2739 } 2740 if (res) 2741 freeaddrinfo(res); 2742 2743 return (socks); 2744 } 2745 2746 static void 2747 increase_rcvbuf(int fd) 2748 { 2749 socklen_t len, slen; 2750 2751 slen = sizeof(len); 2752 2753 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2754 if (len < RCVBUF_MINSIZE) { 2755 len = RCVBUF_MINSIZE; 2756 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2757 } 2758 } 2759 } 2760