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