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