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