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 if (wmsg) 1323 free(wmsg); 1324 } 1325 1326 /* 1327 * WALLMSG -- Write a message to the world at large 1328 * 1329 * Write the specified message to either the entire 1330 * world, or a list of approved users. 1331 */ 1332 static void 1333 wallmsg(struct filed *f, struct iovec *iov) 1334 { 1335 static int reenter; /* avoid calling ourselves */ 1336 FILE *uf; 1337 struct utmp ut; 1338 int i; 1339 const char *p; 1340 char line[sizeof(ut.ut_line) + 1]; 1341 1342 if (reenter++) 1343 return; 1344 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1345 logerror(_PATH_UTMP); 1346 reenter = 0; 1347 return; 1348 } 1349 /* NOSTRICT */ 1350 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1351 if (ut.ut_name[0] == '\0') 1352 continue; 1353 /* We must use strncpy since ut_* may not be NUL terminated. */ 1354 strncpy(line, ut.ut_line, sizeof(line) - 1); 1355 line[sizeof(line) - 1] = '\0'; 1356 if (f->f_type == F_WALL) { 1357 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1358 errno = 0; /* already in msg */ 1359 logerror(p); 1360 } 1361 continue; 1362 } 1363 /* should we send the message to this user? */ 1364 for (i = 0; i < MAXUNAMES; i++) { 1365 if (!f->f_un.f_uname[i][0]) 1366 break; 1367 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1368 UT_NAMESIZE)) { 1369 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1370 != NULL) { 1371 errno = 0; /* already in msg */ 1372 logerror(p); 1373 } 1374 break; 1375 } 1376 } 1377 } 1378 (void)fclose(uf); 1379 reenter = 0; 1380 } 1381 1382 static void 1383 reapchild(int signo __unused) 1384 { 1385 int status; 1386 pid_t pid; 1387 struct filed *f; 1388 1389 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1390 if (!Initialized) 1391 /* Don't tell while we are initting. */ 1392 continue; 1393 1394 /* First, look if it's a process from the dead queue. */ 1395 if (deadq_remove(pid)) 1396 goto oncemore; 1397 1398 /* Now, look in list of active processes. */ 1399 for (f = Files; f; f = f->f_next) 1400 if (f->f_type == F_PIPE && 1401 f->f_un.f_pipe.f_pid == pid) { 1402 (void)close(f->f_file); 1403 f->f_un.f_pipe.f_pid = 0; 1404 log_deadchild(pid, status, 1405 f->f_un.f_pipe.f_pname); 1406 break; 1407 } 1408 oncemore: 1409 continue; 1410 } 1411 } 1412 1413 /* 1414 * Return a printable representation of a host address. 1415 */ 1416 static const char * 1417 cvthname(struct sockaddr *f) 1418 { 1419 int error, hl; 1420 sigset_t omask, nmask; 1421 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1422 1423 error = getnameinfo((struct sockaddr *)f, 1424 ((struct sockaddr *)f)->sa_len, 1425 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1426 dprintf("cvthname(%s)\n", ip); 1427 1428 if (error) { 1429 dprintf("Malformed from address %s\n", gai_strerror(error)); 1430 return ("???"); 1431 } 1432 if (!resolve) 1433 return (ip); 1434 1435 sigemptyset(&nmask); 1436 sigaddset(&nmask, SIGHUP); 1437 sigprocmask(SIG_BLOCK, &nmask, &omask); 1438 error = getnameinfo((struct sockaddr *)f, 1439 ((struct sockaddr *)f)->sa_len, 1440 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1441 sigprocmask(SIG_SETMASK, &omask, NULL); 1442 if (error) { 1443 dprintf("Host name for your address (%s) unknown\n", ip); 1444 return (ip); 1445 } 1446 hl = strlen(hname); 1447 if (hl > 0 && hname[hl-1] == '.') 1448 hname[--hl] = '\0'; 1449 trimdomain(hname, hl); 1450 return (hname); 1451 } 1452 1453 static void 1454 dodie(int signo) 1455 { 1456 1457 WantDie = signo; 1458 } 1459 1460 static void 1461 domark(int signo __unused) 1462 { 1463 1464 MarkSet = 1; 1465 } 1466 1467 /* 1468 * Print syslogd errors some place. 1469 */ 1470 static void 1471 logerror(const char *type) 1472 { 1473 char buf[512]; 1474 static int recursed = 0; 1475 1476 /* If there's an error while trying to log an error, give up. */ 1477 if (recursed) 1478 return; 1479 recursed++; 1480 if (errno) 1481 (void)snprintf(buf, 1482 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1483 else 1484 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1485 errno = 0; 1486 dprintf("%s\n", buf); 1487 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1488 recursed--; 1489 } 1490 1491 static void 1492 die(int signo) 1493 { 1494 struct filed *f; 1495 struct funix *fx; 1496 int was_initialized; 1497 char buf[100]; 1498 1499 was_initialized = Initialized; 1500 Initialized = 0; /* Don't log SIGCHLDs. */ 1501 for (f = Files; f != NULL; f = f->f_next) { 1502 /* flush any pending output */ 1503 if (f->f_prevcount) 1504 fprintlog(f, 0, (char *)NULL); 1505 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1506 (void)close(f->f_file); 1507 f->f_un.f_pipe.f_pid = 0; 1508 } 1509 } 1510 Initialized = was_initialized; 1511 if (signo) { 1512 dprintf("syslogd: exiting on signal %d\n", signo); 1513 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1514 errno = 0; 1515 logerror(buf); 1516 } 1517 STAILQ_FOREACH(fx, &funixes, next) 1518 (void)unlink(fx->name); 1519 pidfile_remove(pfh); 1520 1521 exit(1); 1522 } 1523 1524 /* 1525 * INIT -- Initialize syslogd from configuration table 1526 */ 1527 static void 1528 init(int signo) 1529 { 1530 int i; 1531 FILE *cf; 1532 struct filed *f, *next, **nextp; 1533 char *p; 1534 char cline[LINE_MAX]; 1535 char prog[NAME_MAX+1]; 1536 char host[MAXHOSTNAMELEN]; 1537 char oldLocalHostName[MAXHOSTNAMELEN]; 1538 char hostMsg[2*MAXHOSTNAMELEN+40]; 1539 char bootfileMsg[LINE_MAX]; 1540 1541 dprintf("init\n"); 1542 1543 /* 1544 * Load hostname (may have changed). 1545 */ 1546 if (signo != 0) 1547 (void)strlcpy(oldLocalHostName, LocalHostName, 1548 sizeof(oldLocalHostName)); 1549 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1550 err(EX_OSERR, "gethostname() failed"); 1551 if ((p = strchr(LocalHostName, '.')) != NULL) { 1552 *p++ = '\0'; 1553 LocalDomain = p; 1554 } else { 1555 LocalDomain = ""; 1556 } 1557 1558 /* 1559 * Close all open log files. 1560 */ 1561 Initialized = 0; 1562 for (f = Files; f != NULL; f = next) { 1563 /* flush any pending output */ 1564 if (f->f_prevcount) 1565 fprintlog(f, 0, (char *)NULL); 1566 1567 switch (f->f_type) { 1568 case F_FILE: 1569 case F_FORW: 1570 case F_CONSOLE: 1571 case F_TTY: 1572 (void)close(f->f_file); 1573 break; 1574 case F_PIPE: 1575 if (f->f_un.f_pipe.f_pid > 0) { 1576 (void)close(f->f_file); 1577 deadq_enter(f->f_un.f_pipe.f_pid, 1578 f->f_un.f_pipe.f_pname); 1579 } 1580 f->f_un.f_pipe.f_pid = 0; 1581 break; 1582 } 1583 next = f->f_next; 1584 if (f->f_program) free(f->f_program); 1585 if (f->f_host) free(f->f_host); 1586 free((char *)f); 1587 } 1588 Files = NULL; 1589 nextp = &Files; 1590 1591 /* open the configuration file */ 1592 if ((cf = fopen(ConfFile, "r")) == NULL) { 1593 dprintf("cannot open %s\n", ConfFile); 1594 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1595 if (*nextp == NULL) { 1596 logerror("calloc"); 1597 exit(1); 1598 } 1599 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1600 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1601 if ((*nextp)->f_next == NULL) { 1602 logerror("calloc"); 1603 exit(1); 1604 } 1605 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1606 Initialized = 1; 1607 return; 1608 } 1609 1610 /* 1611 * Foreach line in the conf table, open that file. 1612 */ 1613 f = NULL; 1614 (void)strlcpy(host, "*", sizeof(host)); 1615 (void)strlcpy(prog, "*", sizeof(prog)); 1616 while (fgets(cline, sizeof(cline), cf) != NULL) { 1617 /* 1618 * check for end-of-section, comments, strip off trailing 1619 * spaces and newline character. #!prog is treated specially: 1620 * following lines apply only to that program. 1621 */ 1622 for (p = cline; isspace(*p); ++p) 1623 continue; 1624 if (*p == 0) 1625 continue; 1626 if (*p == '#') { 1627 p++; 1628 if (*p != '!' && *p != '+' && *p != '-') 1629 continue; 1630 } 1631 if (*p == '+' || *p == '-') { 1632 host[0] = *p++; 1633 while (isspace(*p)) 1634 p++; 1635 if ((!*p) || (*p == '*')) { 1636 (void)strlcpy(host, "*", sizeof(host)); 1637 continue; 1638 } 1639 if (*p == '@') 1640 p = LocalHostName; 1641 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1642 if (!isalnum(*p) && *p != '.' && *p != '-' 1643 && *p != ',' && *p != ':' && *p != '%') 1644 break; 1645 host[i] = *p++; 1646 } 1647 host[i] = '\0'; 1648 continue; 1649 } 1650 if (*p == '!') { 1651 p++; 1652 while (isspace(*p)) p++; 1653 if ((!*p) || (*p == '*')) { 1654 (void)strlcpy(prog, "*", sizeof(prog)); 1655 continue; 1656 } 1657 for (i = 0; i < NAME_MAX; i++) { 1658 if (!isprint(p[i]) || isspace(p[i])) 1659 break; 1660 prog[i] = p[i]; 1661 } 1662 prog[i] = 0; 1663 continue; 1664 } 1665 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1666 cline[i] = '\0'; 1667 f = (struct filed *)calloc(1, sizeof(*f)); 1668 if (f == NULL) { 1669 logerror("calloc"); 1670 exit(1); 1671 } 1672 *nextp = f; 1673 nextp = &f->f_next; 1674 cfline(cline, f, prog, host); 1675 } 1676 1677 /* close the configuration file */ 1678 (void)fclose(cf); 1679 1680 Initialized = 1; 1681 1682 if (Debug) { 1683 int port; 1684 for (f = Files; f; f = f->f_next) { 1685 for (i = 0; i <= LOG_NFACILITIES; i++) 1686 if (f->f_pmask[i] == INTERNAL_NOPRI) 1687 printf("X "); 1688 else 1689 printf("%d ", f->f_pmask[i]); 1690 printf("%s: ", TypeNames[f->f_type]); 1691 switch (f->f_type) { 1692 case F_FILE: 1693 printf("%s", f->f_un.f_fname); 1694 break; 1695 1696 case F_CONSOLE: 1697 case F_TTY: 1698 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1699 break; 1700 1701 case F_FORW: 1702 port = (int)ntohs(((struct sockaddr_in *) 1703 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1704 if (port != 514) { 1705 printf("%s:%d", 1706 f->f_un.f_forw.f_hname, port); 1707 } else { 1708 printf("%s", f->f_un.f_forw.f_hname); 1709 } 1710 break; 1711 1712 case F_PIPE: 1713 printf("%s", f->f_un.f_pipe.f_pname); 1714 break; 1715 1716 case F_USERS: 1717 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1718 printf("%s, ", f->f_un.f_uname[i]); 1719 break; 1720 } 1721 if (f->f_program) 1722 printf(" (%s)", f->f_program); 1723 printf("\n"); 1724 } 1725 } 1726 1727 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1728 dprintf("syslogd: restarted\n"); 1729 /* 1730 * Log a change in hostname, but only on a restart. 1731 */ 1732 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1733 (void)snprintf(hostMsg, sizeof(hostMsg), 1734 "syslogd: hostname changed, \"%s\" to \"%s\"", 1735 oldLocalHostName, LocalHostName); 1736 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1737 dprintf("%s\n", hostMsg); 1738 } 1739 /* 1740 * Log the kernel boot file if we aren't going to use it as 1741 * the prefix, and if this is *not* a restart. 1742 */ 1743 if (signo == 0 && !use_bootfile) { 1744 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1745 "syslogd: kernel boot file is %s", bootfile); 1746 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1747 dprintf("%s\n", bootfileMsg); 1748 } 1749 } 1750 1751 /* 1752 * Crack a configuration file line 1753 */ 1754 static void 1755 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1756 { 1757 struct addrinfo hints, *res; 1758 int error, i, pri, syncfile; 1759 const char *p, *q; 1760 char *bp; 1761 char buf[MAXLINE], ebuf[100]; 1762 1763 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1764 1765 errno = 0; /* keep strerror() stuff out of logerror messages */ 1766 1767 /* clear out file entry */ 1768 memset(f, 0, sizeof(*f)); 1769 for (i = 0; i <= LOG_NFACILITIES; i++) 1770 f->f_pmask[i] = INTERNAL_NOPRI; 1771 1772 /* save hostname if any */ 1773 if (host && *host == '*') 1774 host = NULL; 1775 if (host) { 1776 int hl; 1777 1778 f->f_host = strdup(host); 1779 if (f->f_host == NULL) { 1780 logerror("strdup"); 1781 exit(1); 1782 } 1783 hl = strlen(f->f_host); 1784 if (hl > 0 && f->f_host[hl-1] == '.') 1785 f->f_host[--hl] = '\0'; 1786 trimdomain(f->f_host, hl); 1787 } 1788 1789 /* save program name if any */ 1790 if (prog && *prog == '*') 1791 prog = NULL; 1792 if (prog) { 1793 f->f_program = strdup(prog); 1794 if (f->f_program == NULL) { 1795 logerror("strdup"); 1796 exit(1); 1797 } 1798 } 1799 1800 /* scan through the list of selectors */ 1801 for (p = line; *p && *p != '\t' && *p != ' ';) { 1802 int pri_done; 1803 int pri_cmp; 1804 int pri_invert; 1805 1806 /* find the end of this facility name list */ 1807 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1808 continue; 1809 1810 /* get the priority comparison */ 1811 pri_cmp = 0; 1812 pri_done = 0; 1813 pri_invert = 0; 1814 if (*q == '!') { 1815 pri_invert = 1; 1816 q++; 1817 } 1818 while (!pri_done) { 1819 switch (*q) { 1820 case '<': 1821 pri_cmp |= PRI_LT; 1822 q++; 1823 break; 1824 case '=': 1825 pri_cmp |= PRI_EQ; 1826 q++; 1827 break; 1828 case '>': 1829 pri_cmp |= PRI_GT; 1830 q++; 1831 break; 1832 default: 1833 pri_done++; 1834 break; 1835 } 1836 } 1837 1838 /* collect priority name */ 1839 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1840 *bp++ = *q++; 1841 *bp = '\0'; 1842 1843 /* skip cruft */ 1844 while (strchr(",;", *q)) 1845 q++; 1846 1847 /* decode priority name */ 1848 if (*buf == '*') { 1849 pri = LOG_PRIMASK; 1850 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1851 } else { 1852 /* Ignore trailing spaces. */ 1853 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1854 buf[i] = '\0'; 1855 1856 pri = decode(buf, prioritynames); 1857 if (pri < 0) { 1858 (void)snprintf(ebuf, sizeof ebuf, 1859 "unknown priority name \"%s\"", buf); 1860 logerror(ebuf); 1861 return; 1862 } 1863 } 1864 if (!pri_cmp) 1865 pri_cmp = (UniquePriority) 1866 ? (PRI_EQ) 1867 : (PRI_EQ | PRI_GT) 1868 ; 1869 if (pri_invert) 1870 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1871 1872 /* scan facilities */ 1873 while (*p && !strchr("\t.; ", *p)) { 1874 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1875 *bp++ = *p++; 1876 *bp = '\0'; 1877 1878 if (*buf == '*') { 1879 for (i = 0; i < LOG_NFACILITIES; i++) { 1880 f->f_pmask[i] = pri; 1881 f->f_pcmp[i] = pri_cmp; 1882 } 1883 } else { 1884 i = decode(buf, facilitynames); 1885 if (i < 0) { 1886 (void)snprintf(ebuf, sizeof ebuf, 1887 "unknown facility name \"%s\"", 1888 buf); 1889 logerror(ebuf); 1890 return; 1891 } 1892 f->f_pmask[i >> 3] = pri; 1893 f->f_pcmp[i >> 3] = pri_cmp; 1894 } 1895 while (*p == ',' || *p == ' ') 1896 p++; 1897 } 1898 1899 p = q; 1900 } 1901 1902 /* skip to action part */ 1903 while (*p == '\t' || *p == ' ') 1904 p++; 1905 1906 if (*p == '-') { 1907 syncfile = 0; 1908 p++; 1909 } else 1910 syncfile = 1; 1911 1912 switch (*p) { 1913 case '@': 1914 { 1915 char *tp; 1916 /* 1917 * scan forward to see if there is a port defined. 1918 * so we can't use strlcpy.. 1919 */ 1920 i = sizeof(f->f_un.f_forw.f_hname); 1921 tp = f->f_un.f_forw.f_hname; 1922 p++; 1923 1924 while (*p && (*p != ':') && (i-- > 0)) { 1925 *tp++ = *p++; 1926 } 1927 *tp = '\0'; 1928 } 1929 /* See if we copied a domain and have a port */ 1930 if (*p == ':') 1931 p++; 1932 else 1933 p = NULL; 1934 1935 memset(&hints, 0, sizeof(hints)); 1936 hints.ai_family = family; 1937 hints.ai_socktype = SOCK_DGRAM; 1938 error = getaddrinfo(f->f_un.f_forw.f_hname, 1939 p ? p : "syslog", &hints, &res); 1940 if (error) { 1941 logerror(gai_strerror(error)); 1942 break; 1943 } 1944 f->f_un.f_forw.f_addr = res; 1945 f->f_type = F_FORW; 1946 break; 1947 1948 case '/': 1949 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1950 f->f_type = F_UNUSED; 1951 logerror(p); 1952 break; 1953 } 1954 if (syncfile) 1955 f->f_flags |= FFLAG_SYNC; 1956 if (isatty(f->f_file)) { 1957 if (strcmp(p, ctty) == 0) 1958 f->f_type = F_CONSOLE; 1959 else 1960 f->f_type = F_TTY; 1961 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1962 sizeof(f->f_un.f_fname)); 1963 } else { 1964 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1965 f->f_type = F_FILE; 1966 } 1967 break; 1968 1969 case '|': 1970 f->f_un.f_pipe.f_pid = 0; 1971 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 1972 sizeof(f->f_un.f_pipe.f_pname)); 1973 f->f_type = F_PIPE; 1974 break; 1975 1976 case '*': 1977 f->f_type = F_WALL; 1978 break; 1979 1980 default: 1981 for (i = 0; i < MAXUNAMES && *p; i++) { 1982 for (q = p; *q && *q != ','; ) 1983 q++; 1984 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1985 if ((q - p) > UT_NAMESIZE) 1986 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1987 else 1988 f->f_un.f_uname[i][q - p] = '\0'; 1989 while (*q == ',' || *q == ' ') 1990 q++; 1991 p = q; 1992 } 1993 f->f_type = F_USERS; 1994 break; 1995 } 1996 } 1997 1998 1999 /* 2000 * Decode a symbolic name to a numeric value 2001 */ 2002 static int 2003 decode(const char *name, CODE *codetab) 2004 { 2005 CODE *c; 2006 char *p, buf[40]; 2007 2008 if (isdigit(*name)) 2009 return (atoi(name)); 2010 2011 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2012 if (isupper(*name)) 2013 *p = tolower(*name); 2014 else 2015 *p = *name; 2016 } 2017 *p = '\0'; 2018 for (c = codetab; c->c_name; c++) 2019 if (!strcmp(buf, c->c_name)) 2020 return (c->c_val); 2021 2022 return (-1); 2023 } 2024 2025 static void 2026 markit(void) 2027 { 2028 struct filed *f; 2029 dq_t q, next; 2030 2031 now = time((time_t *)NULL); 2032 MarkSeq += TIMERINTVL; 2033 if (MarkSeq >= MarkInterval) { 2034 logmsg(LOG_INFO, "-- MARK --", 2035 LocalHostName, ADDDATE|MARK); 2036 MarkSeq = 0; 2037 } 2038 2039 for (f = Files; f; f = f->f_next) { 2040 if (f->f_prevcount && now >= REPEATTIME(f)) { 2041 dprintf("flush %s: repeated %d times, %d sec.\n", 2042 TypeNames[f->f_type], f->f_prevcount, 2043 repeatinterval[f->f_repeatcount]); 2044 fprintlog(f, 0, (char *)NULL); 2045 BACKOFF(f); 2046 } 2047 } 2048 2049 /* Walk the dead queue, and see if we should signal somebody. */ 2050 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2051 next = TAILQ_NEXT(q, dq_entries); 2052 2053 switch (q->dq_timeout) { 2054 case 0: 2055 /* Already signalled once, try harder now. */ 2056 if (kill(q->dq_pid, SIGKILL) != 0) 2057 (void)deadq_remove(q->dq_pid); 2058 break; 2059 2060 case 1: 2061 /* 2062 * Timed out on dead queue, send terminate 2063 * signal. Note that we leave the removal 2064 * from the dead queue to reapchild(), which 2065 * will also log the event (unless the process 2066 * didn't even really exist, in case we simply 2067 * drop it from the dead queue). 2068 */ 2069 if (kill(q->dq_pid, SIGTERM) != 0) 2070 (void)deadq_remove(q->dq_pid); 2071 /* FALLTHROUGH */ 2072 2073 default: 2074 q->dq_timeout--; 2075 } 2076 } 2077 MarkSet = 0; 2078 (void)alarm(TIMERINTVL); 2079 } 2080 2081 /* 2082 * fork off and become a daemon, but wait for the child to come online 2083 * before returing to the parent, or we get disk thrashing at boot etc. 2084 * Set a timer so we don't hang forever if it wedges. 2085 */ 2086 static int 2087 waitdaemon(int nochdir, int noclose, int maxwait) 2088 { 2089 int fd; 2090 int status; 2091 pid_t pid, childpid; 2092 2093 switch (childpid = fork()) { 2094 case -1: 2095 return (-1); 2096 case 0: 2097 break; 2098 default: 2099 signal(SIGALRM, timedout); 2100 alarm(maxwait); 2101 while ((pid = wait3(&status, 0, NULL)) != -1) { 2102 if (WIFEXITED(status)) 2103 errx(1, "child pid %d exited with return code %d", 2104 pid, WEXITSTATUS(status)); 2105 if (WIFSIGNALED(status)) 2106 errx(1, "child pid %d exited on signal %d%s", 2107 pid, WTERMSIG(status), 2108 WCOREDUMP(status) ? " (core dumped)" : 2109 ""); 2110 if (pid == childpid) /* it's gone... */ 2111 break; 2112 } 2113 exit(0); 2114 } 2115 2116 if (setsid() == -1) 2117 return (-1); 2118 2119 if (!nochdir) 2120 (void)chdir("/"); 2121 2122 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2123 (void)dup2(fd, STDIN_FILENO); 2124 (void)dup2(fd, STDOUT_FILENO); 2125 (void)dup2(fd, STDERR_FILENO); 2126 if (fd > 2) 2127 (void)close (fd); 2128 } 2129 return (getppid()); 2130 } 2131 2132 /* 2133 * We get a SIGALRM from the child when it's running and finished doing it's 2134 * fsync()'s or O_SYNC writes for all the boot messages. 2135 * 2136 * We also get a signal from the kernel if the timer expires, so check to 2137 * see what happened. 2138 */ 2139 static void 2140 timedout(int sig __unused) 2141 { 2142 int left; 2143 left = alarm(0); 2144 signal(SIGALRM, SIG_DFL); 2145 if (left == 0) 2146 errx(1, "timed out waiting for child"); 2147 else 2148 _exit(0); 2149 } 2150 2151 /* 2152 * Add `s' to the list of allowable peer addresses to accept messages 2153 * from. 2154 * 2155 * `s' is a string in the form: 2156 * 2157 * [*]domainname[:{servicename|portnumber|*}] 2158 * 2159 * or 2160 * 2161 * netaddr/maskbits[:{servicename|portnumber|*}] 2162 * 2163 * Returns -1 on error, 0 if the argument was valid. 2164 */ 2165 static int 2166 allowaddr(char *s) 2167 { 2168 char *cp1, *cp2; 2169 struct allowedpeer ap; 2170 struct servent *se; 2171 int masklen = -1, i; 2172 struct addrinfo hints, *res; 2173 struct in_addr *addrp, *maskp; 2174 u_int32_t *addr6p, *mask6p; 2175 char ip[NI_MAXHOST]; 2176 2177 #ifdef INET6 2178 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2179 #endif 2180 cp1 = s; 2181 if ((cp1 = strrchr(cp1, ':'))) { 2182 /* service/port provided */ 2183 *cp1++ = '\0'; 2184 if (strlen(cp1) == 1 && *cp1 == '*') 2185 /* any port allowed */ 2186 ap.port = 0; 2187 else if ((se = getservbyname(cp1, "udp"))) { 2188 ap.port = ntohs(se->s_port); 2189 } else { 2190 ap.port = strtol(cp1, &cp2, 0); 2191 if (*cp2 != '\0') 2192 return (-1); /* port not numeric */ 2193 } 2194 } else { 2195 if ((se = getservbyname("syslog", "udp"))) 2196 ap.port = ntohs(se->s_port); 2197 else 2198 /* sanity, should not happen */ 2199 ap.port = 514; 2200 } 2201 2202 if ((cp1 = strchr(s, '/')) != NULL && 2203 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2204 *cp1 = '\0'; 2205 if ((masklen = atoi(cp1 + 1)) < 0) 2206 return (-1); 2207 } 2208 #ifdef INET6 2209 if (*s == '[') { 2210 cp2 = s + strlen(s) - 1; 2211 if (*cp2 == ']') { 2212 ++s; 2213 *cp2 = '\0'; 2214 } else { 2215 cp2 = NULL; 2216 } 2217 } else { 2218 cp2 = NULL; 2219 } 2220 #endif 2221 memset(&hints, 0, sizeof(hints)); 2222 hints.ai_family = PF_UNSPEC; 2223 hints.ai_socktype = SOCK_DGRAM; 2224 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2225 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2226 ap.isnumeric = 1; 2227 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2228 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2229 ap.a_mask.ss_family = res->ai_family; 2230 if (res->ai_family == AF_INET) { 2231 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2232 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2233 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2234 if (masklen < 0) { 2235 /* use default netmask */ 2236 if (IN_CLASSA(ntohl(addrp->s_addr))) 2237 maskp->s_addr = htonl(IN_CLASSA_NET); 2238 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2239 maskp->s_addr = htonl(IN_CLASSB_NET); 2240 else 2241 maskp->s_addr = htonl(IN_CLASSC_NET); 2242 } else if (masklen <= 32) { 2243 /* convert masklen to netmask */ 2244 if (masklen == 0) 2245 maskp->s_addr = 0; 2246 else 2247 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2248 } else { 2249 freeaddrinfo(res); 2250 return (-1); 2251 } 2252 /* Lose any host bits in the network number. */ 2253 addrp->s_addr &= maskp->s_addr; 2254 } 2255 #ifdef INET6 2256 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2257 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2258 if (masklen < 0) 2259 masklen = 128; 2260 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2261 /* convert masklen to netmask */ 2262 while (masklen > 0) { 2263 if (masklen < 32) { 2264 *mask6p = htonl(~(0xffffffff >> masklen)); 2265 break; 2266 } 2267 *mask6p++ = 0xffffffff; 2268 masklen -= 32; 2269 } 2270 /* Lose any host bits in the network number. */ 2271 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2272 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2273 for (i = 0; i < 4; i++) 2274 addr6p[i] &= mask6p[i]; 2275 } 2276 #endif 2277 else { 2278 freeaddrinfo(res); 2279 return (-1); 2280 } 2281 freeaddrinfo(res); 2282 } else { 2283 /* arg `s' is domain name */ 2284 ap.isnumeric = 0; 2285 ap.a_name = s; 2286 if (cp1) 2287 *cp1 = '/'; 2288 #ifdef INET6 2289 if (cp2) { 2290 *cp2 = ']'; 2291 --s; 2292 } 2293 #endif 2294 } 2295 2296 if (Debug) { 2297 printf("allowaddr: rule %d: ", NumAllowed); 2298 if (ap.isnumeric) { 2299 printf("numeric, "); 2300 getnameinfo((struct sockaddr *)&ap.a_addr, 2301 ((struct sockaddr *)&ap.a_addr)->sa_len, 2302 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2303 printf("addr = %s, ", ip); 2304 getnameinfo((struct sockaddr *)&ap.a_mask, 2305 ((struct sockaddr *)&ap.a_mask)->sa_len, 2306 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2307 printf("mask = %s; ", ip); 2308 } else { 2309 printf("domainname = %s; ", ap.a_name); 2310 } 2311 printf("port = %d\n", ap.port); 2312 } 2313 2314 if ((AllowedPeers = realloc(AllowedPeers, 2315 ++NumAllowed * sizeof(struct allowedpeer))) 2316 == NULL) { 2317 logerror("realloc"); 2318 exit(1); 2319 } 2320 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2321 return (0); 2322 } 2323 2324 /* 2325 * Validate that the remote peer has permission to log to us. 2326 */ 2327 static int 2328 validate(struct sockaddr *sa, const char *hname) 2329 { 2330 int i, j, reject; 2331 size_t l1, l2; 2332 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2333 struct allowedpeer *ap; 2334 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2335 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2336 struct addrinfo hints, *res; 2337 u_short sport; 2338 2339 if (NumAllowed == 0) 2340 /* traditional behaviour, allow everything */ 2341 return (1); 2342 2343 (void)strlcpy(name, hname, sizeof(name)); 2344 memset(&hints, 0, sizeof(hints)); 2345 hints.ai_family = PF_UNSPEC; 2346 hints.ai_socktype = SOCK_DGRAM; 2347 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2348 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2349 freeaddrinfo(res); 2350 else if (strchr(name, '.') == NULL) { 2351 strlcat(name, ".", sizeof name); 2352 strlcat(name, LocalDomain, sizeof name); 2353 } 2354 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2355 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2356 return (0); /* for safety, should not occur */ 2357 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2358 ip, port, name); 2359 sport = atoi(port); 2360 2361 /* now, walk down the list */ 2362 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2363 if (ap->port != 0 && ap->port != sport) { 2364 dprintf("rejected in rule %d due to port mismatch.\n", i); 2365 continue; 2366 } 2367 2368 if (ap->isnumeric) { 2369 if (ap->a_addr.ss_family != sa->sa_family) { 2370 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2371 continue; 2372 } 2373 if (ap->a_addr.ss_family == AF_INET) { 2374 sin4 = (struct sockaddr_in *)sa; 2375 a4p = (struct sockaddr_in *)&ap->a_addr; 2376 m4p = (struct sockaddr_in *)&ap->a_mask; 2377 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2378 != a4p->sin_addr.s_addr) { 2379 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2380 continue; 2381 } 2382 } 2383 #ifdef INET6 2384 else if (ap->a_addr.ss_family == AF_INET6) { 2385 sin6 = (struct sockaddr_in6 *)sa; 2386 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2387 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2388 if (a6p->sin6_scope_id != 0 && 2389 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2390 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2391 continue; 2392 } 2393 reject = 0; 2394 for (j = 0; j < 16; j += 4) { 2395 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2396 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2397 ++reject; 2398 break; 2399 } 2400 } 2401 if (reject) { 2402 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2403 continue; 2404 } 2405 } 2406 #endif 2407 else 2408 continue; 2409 } else { 2410 cp = ap->a_name; 2411 l1 = strlen(name); 2412 if (*cp == '*') { 2413 /* allow wildmatch */ 2414 cp++; 2415 l2 = strlen(cp); 2416 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2417 dprintf("rejected in rule %d due to name mismatch.\n", i); 2418 continue; 2419 } 2420 } else { 2421 /* exact match */ 2422 l2 = strlen(cp); 2423 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2424 dprintf("rejected in rule %d due to name mismatch.\n", i); 2425 continue; 2426 } 2427 } 2428 } 2429 dprintf("accepted in rule %d.\n", i); 2430 return (1); /* hooray! */ 2431 } 2432 return (0); 2433 } 2434 2435 /* 2436 * Fairly similar to popen(3), but returns an open descriptor, as 2437 * opposed to a FILE *. 2438 */ 2439 static int 2440 p_open(const char *prog, pid_t *rpid) 2441 { 2442 int pfd[2], nulldesc, i; 2443 pid_t pid; 2444 sigset_t omask, mask; 2445 char *argv[4]; /* sh -c cmd NULL */ 2446 char errmsg[200]; 2447 2448 if (pipe(pfd) == -1) 2449 return (-1); 2450 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2451 /* we are royally screwed anyway */ 2452 return (-1); 2453 2454 sigemptyset(&mask); 2455 sigaddset(&mask, SIGALRM); 2456 sigaddset(&mask, SIGHUP); 2457 sigprocmask(SIG_BLOCK, &mask, &omask); 2458 switch ((pid = fork())) { 2459 case -1: 2460 sigprocmask(SIG_SETMASK, &omask, 0); 2461 close(nulldesc); 2462 return (-1); 2463 2464 case 0: 2465 argv[0] = strdup("sh"); 2466 argv[1] = strdup("-c"); 2467 argv[2] = strdup(prog); 2468 argv[3] = NULL; 2469 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2470 logerror("strdup"); 2471 exit(1); 2472 } 2473 2474 alarm(0); 2475 (void)setsid(); /* Avoid catching SIGHUPs. */ 2476 2477 /* 2478 * Throw away pending signals, and reset signal 2479 * behaviour to standard values. 2480 */ 2481 signal(SIGALRM, SIG_IGN); 2482 signal(SIGHUP, SIG_IGN); 2483 sigprocmask(SIG_SETMASK, &omask, 0); 2484 signal(SIGPIPE, SIG_DFL); 2485 signal(SIGQUIT, SIG_DFL); 2486 signal(SIGALRM, SIG_DFL); 2487 signal(SIGHUP, SIG_DFL); 2488 2489 dup2(pfd[0], STDIN_FILENO); 2490 dup2(nulldesc, STDOUT_FILENO); 2491 dup2(nulldesc, STDERR_FILENO); 2492 for (i = getdtablesize(); i > 2; i--) 2493 (void)close(i); 2494 2495 (void)execvp(_PATH_BSHELL, argv); 2496 _exit(255); 2497 } 2498 2499 sigprocmask(SIG_SETMASK, &omask, 0); 2500 close(nulldesc); 2501 close(pfd[0]); 2502 /* 2503 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2504 * supposed to get an EWOULDBLOCK on writev(2), which is 2505 * caught by the logic above anyway, which will in turn close 2506 * the pipe, and fork a new logging subprocess if necessary. 2507 * The stale subprocess will be killed some time later unless 2508 * it terminated itself due to closing its input pipe (so we 2509 * get rid of really dead puppies). 2510 */ 2511 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2512 /* This is bad. */ 2513 (void)snprintf(errmsg, sizeof errmsg, 2514 "Warning: cannot change pipe to PID %d to " 2515 "non-blocking behaviour.", 2516 (int)pid); 2517 logerror(errmsg); 2518 } 2519 *rpid = pid; 2520 return (pfd[1]); 2521 } 2522 2523 static void 2524 deadq_enter(pid_t pid, const char *name) 2525 { 2526 dq_t p; 2527 int status; 2528 2529 /* 2530 * Be paranoid, if we can't signal the process, don't enter it 2531 * into the dead queue (perhaps it's already dead). If possible, 2532 * we try to fetch and log the child's status. 2533 */ 2534 if (kill(pid, 0) != 0) { 2535 if (waitpid(pid, &status, WNOHANG) > 0) 2536 log_deadchild(pid, status, name); 2537 return; 2538 } 2539 2540 p = malloc(sizeof(struct deadq_entry)); 2541 if (p == NULL) { 2542 logerror("malloc"); 2543 exit(1); 2544 } 2545 2546 p->dq_pid = pid; 2547 p->dq_timeout = DQ_TIMO_INIT; 2548 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2549 } 2550 2551 static int 2552 deadq_remove(pid_t pid) 2553 { 2554 dq_t q; 2555 2556 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2557 if (q->dq_pid == pid) { 2558 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2559 free(q); 2560 return (1); 2561 } 2562 } 2563 2564 return (0); 2565 } 2566 2567 static void 2568 log_deadchild(pid_t pid, int status, const char *name) 2569 { 2570 int code; 2571 char buf[256]; 2572 const char *reason; 2573 2574 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2575 if (WIFSIGNALED(status)) { 2576 reason = "due to signal"; 2577 code = WTERMSIG(status); 2578 } else { 2579 reason = "with status"; 2580 code = WEXITSTATUS(status); 2581 if (code == 0) 2582 return; 2583 } 2584 (void)snprintf(buf, sizeof buf, 2585 "Logging subprocess %d (%s) exited %s %d.", 2586 pid, name, reason, code); 2587 logerror(buf); 2588 } 2589 2590 static int * 2591 socksetup(int af, const char *bindhostname) 2592 { 2593 struct addrinfo hints, *res, *r; 2594 int error, maxs, *s, *socks; 2595 2596 memset(&hints, 0, sizeof(hints)); 2597 hints.ai_flags = AI_PASSIVE; 2598 hints.ai_family = af; 2599 hints.ai_socktype = SOCK_DGRAM; 2600 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2601 if (error) { 2602 logerror(gai_strerror(error)); 2603 errno = 0; 2604 die(0); 2605 } 2606 2607 /* Count max number of sockets we may open */ 2608 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2609 socks = malloc((maxs+1) * sizeof(int)); 2610 if (socks == NULL) { 2611 logerror("couldn't allocate memory for sockets"); 2612 die(0); 2613 } 2614 2615 *socks = 0; /* num of sockets counter at start of array */ 2616 s = socks + 1; 2617 for (r = res; r; r = r->ai_next) { 2618 int on = 1; 2619 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2620 if (*s < 0) { 2621 logerror("socket"); 2622 continue; 2623 } 2624 if (r->ai_family == AF_INET6) { 2625 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2626 (char *)&on, sizeof (on)) < 0) { 2627 logerror("setsockopt"); 2628 close(*s); 2629 continue; 2630 } 2631 } 2632 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2633 (char *)&on, sizeof (on)) < 0) { 2634 logerror("setsockopt"); 2635 close(*s); 2636 continue; 2637 } 2638 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2639 close(*s); 2640 logerror("bind"); 2641 continue; 2642 } 2643 2644 double_rbuf(*s); 2645 2646 (*socks)++; 2647 s++; 2648 } 2649 2650 if (*socks == 0) { 2651 free(socks); 2652 if (Debug) 2653 return (NULL); 2654 else 2655 die(0); 2656 } 2657 if (res) 2658 freeaddrinfo(res); 2659 2660 return (socks); 2661 } 2662 2663 static void 2664 double_rbuf(int fd) 2665 { 2666 socklen_t slen, len; 2667 2668 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2669 len *= 2; 2670 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); 2671 } 2672 } 2673