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