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 * 3. 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 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94 30 * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.163 2008/12/19 18:27:51 delphij Exp $ 31 * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.6 2007/08/09 02:17:46 dillon Exp $ 32 */ 33 34 /* 35 * syslogd -- log system messages 36 * 37 * This program implements a system log. It takes a series of lines. 38 * Each line may have a priority, signified as "<n>" as 39 * the first characters of the line. If this is 40 * not present, a default priority is used. 41 * 42 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 43 * cause it to reread its configuration file. 44 * 45 * Defined Constants: 46 * 47 * MAXLINE -- the maximum line length that can be handled. 48 * DEFUPRI -- the default priority for user messages 49 * DEFSPRI -- the default priority for kernel messages 50 * 51 * Author: Eric Allman 52 * extensive changes by Ralph Campbell 53 * more extensive changes by Eric Allman (again) 54 * Extension to log by program name as well as facility and priority 55 * by Peter da Silva. 56 * -u and -v by Harlan Stenn. 57 * Priority comparison code by Harlan Stenn. 58 * Ring buffer code by Jeff Wheelhouse. 59 */ 60 61 #define MAXLINE 1024 /* maximum line length */ 62 #define MAXSVLINE 120 /* maximum saved line length */ 63 #define DEFUPRI (LOG_USER|LOG_NOTICE) 64 #define DEFSPRI (LOG_KERN|LOG_CRIT) 65 #define TIMERINTVL 30 /* interval for checking flush, mark */ 66 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 67 68 #include <sys/param.h> 69 #include <sys/ioctl.h> 70 #include <sys/stat.h> 71 #include <sys/wait.h> 72 #include <sys/socket.h> 73 #include <sys/queue.h> 74 #include <sys/uio.h> 75 #include <sys/un.h> 76 #include <sys/time.h> 77 #include <sys/resource.h> 78 #include <sys/syslimits.h> 79 #include <sys/mman.h> 80 #include <sys/types.h> 81 82 #include <netinet/in.h> 83 #include <netdb.h> 84 #include <arpa/inet.h> 85 86 #include <ctype.h> 87 #include <err.h> 88 #include <errno.h> 89 #include <fcntl.h> 90 #include <libutil.h> 91 #include <limits.h> 92 #include <paths.h> 93 #include <signal.h> 94 #include <stdio.h> 95 #include <stdlib.h> 96 #include <string.h> 97 #include <sysexits.h> 98 #include <unistd.h> 99 #include "utmpentry.h" 100 101 #include "pathnames.h" 102 #include "ttymsg.h" 103 #include "../clog/clog.h" 104 #include "../nscd/pidfile.h" 105 106 #define SYSLOG_NAMES 107 #include <sys/syslog.h> 108 109 const char *ConfFile = _PATH_LOGCONF; 110 const char *PidFile = _PATH_LOGPID; 111 const char ctty[] = _PATH_CONSOLE; 112 const char ring_magic[] = "CLOG"; 113 114 #define dprintf if (Debug) printf 115 116 #define MAXUNAMES 20 /* maximum number of user names */ 117 118 /* 119 * Unix sockets. 120 * We have two default sockets, one with 666 permissions, 121 * and one for privileged programs. 122 */ 123 struct funix { 124 int s; 125 const char *name; 126 mode_t mode; 127 STAILQ_ENTRY(funix) next; 128 }; 129 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 130 { NULL } }; 131 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 132 { &funix_secure } }; 133 134 STAILQ_HEAD(, funix) funixes = { &funix_default, 135 &(funix_secure.next.stqe_next) }; 136 137 /* 138 * Flags to logmsg(). 139 */ 140 141 #define IGN_CONS 0x001 /* don't print on console */ 142 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 143 #define ADDDATE 0x004 /* add a date to the message */ 144 #define MARK 0x008 /* this message is a mark */ 145 #define ISKERNEL 0x010 /* kernel generated message */ 146 147 /* 148 * This structure represents the files that will have log 149 * copies printed. 150 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 151 * or if f_type if F_PIPE and f_pid > 0. 152 */ 153 154 struct filed { 155 struct filed *f_next; /* next in linked list */ 156 short f_type; /* entry type, see below */ 157 short f_file; /* file descriptor */ 158 time_t f_time; /* time this was last written */ 159 char *f_host; /* host from which to recd. */ 160 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 161 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 162 #define PRI_LT 0x1 163 #define PRI_EQ 0x2 164 #define PRI_GT 0x4 165 char *f_program; /* program this applies to */ 166 union { 167 char f_uname[MAXUNAMES][32+1]; 168 struct { 169 char f_hname[MAXHOSTNAMELEN]; 170 struct addrinfo *f_addr; 171 172 } f_forw; /* forwarding address */ 173 char f_fname[MAXPATHLEN]; 174 struct { 175 char f_pname[MAXPATHLEN]; 176 pid_t f_pid; 177 } f_pipe; 178 struct { 179 char f_rname[MAXPATHLEN]; 180 struct clog_footer *f_footer; 181 size_t f_size; 182 } f_ring; 183 } f_un; 184 char f_prevline[MAXSVLINE]; /* last message logged */ 185 char f_lasttime[16]; /* time of last occurrence */ 186 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 187 int f_prevpri; /* pri of f_prevline */ 188 int f_prevlen; /* length of f_prevline */ 189 int f_prevcount; /* repetition cnt of prevline */ 190 u_int f_repeatcount; /* number of "repeated" msgs */ 191 int f_flags; /* file-specific flags */ 192 #define FFLAG_SYNC 0x01 193 #define FFLAG_NEEDSYNC 0x02 194 }; 195 196 /* 197 * Queue of about-to-be dead processes we should watch out for. 198 */ 199 200 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 201 struct stailhead *deadq_headp; 202 203 struct deadq_entry { 204 pid_t dq_pid; 205 int dq_timeout; 206 TAILQ_ENTRY(deadq_entry) dq_entries; 207 }; 208 209 /* 210 * The timeout to apply to processes waiting on the dead queue. Unit 211 * of measure is `mark intervals', i.e. 20 minutes by default. 212 * Processes on the dead queue will be terminated after that time. 213 */ 214 215 #define DQ_TIMO_INIT 2 216 217 typedef struct deadq_entry *dq_t; 218 219 220 /* 221 * Struct to hold records of network addresses that are allowed to log 222 * to us. 223 */ 224 struct allowedpeer { 225 int isnumeric; 226 u_short port; 227 union { 228 struct { 229 struct sockaddr_storage addr; 230 struct sockaddr_storage mask; 231 } numeric; 232 char *name; 233 } u; 234 #define a_addr u.numeric.addr 235 #define a_mask u.numeric.mask 236 #define a_name u.name 237 }; 238 239 240 /* 241 * Intervals at which we flush out "message repeated" messages, 242 * in seconds after previous message is logged. After each flush, 243 * we move to the next interval until we reach the largest. 244 */ 245 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 246 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 247 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 248 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 249 (f)->f_repeatcount = MAXREPEAT; \ 250 } 251 252 /* values for f_type */ 253 #define F_UNUSED 0 /* unused entry */ 254 #define F_FILE 1 /* regular file */ 255 #define F_TTY 2 /* terminal */ 256 #define F_CONSOLE 3 /* console terminal */ 257 #define F_FORW 4 /* remote machine */ 258 #define F_USERS 5 /* list of users */ 259 #define F_WALL 6 /* everyone logged on */ 260 #define F_PIPE 7 /* pipe to program */ 261 #define F_RING 8 /* ring buffer (circular log) */ 262 263 const char *TypeNames[] = { 264 "UNUSED", "FILE", "TTY", "CONSOLE", 265 "FORW", "USERS", "WALL", "PIPE", 266 "RING" 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 ssize_t rbwrite(struct filed *, char *, size_t); 331 ssize_t rbwritev(struct filed *, struct iovec *, int); 332 static void readklog(void); 333 static void reapchild(int); 334 static void usage(void); 335 static int validate(struct sockaddr *, const char *); 336 static void unmapped(struct sockaddr *); 337 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 338 static int waitdaemon(int, int, int); 339 static void timedout(int); 340 static void double_rbuf(int); 341 342 int 343 main(int argc, char *argv[]) 344 { 345 int ch, i, fdsrmax = 0, l; 346 struct sockaddr_un sunx, fromunix; 347 struct sockaddr_storage frominet; 348 fd_set *fdsr = NULL; 349 char line[MAXLINE + 1]; 350 const char *bindhostname, *hname; 351 struct timeval tv, *tvp; 352 struct sigaction sact; 353 struct funix *fx, *fx1; 354 sigset_t mask; 355 pid_t ppid = 1, spid; 356 socklen_t len; 357 358 bindhostname = NULL; 359 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nop:P:sS:Tuv")) 360 != -1) 361 switch (ch) { 362 case '4': 363 family = PF_INET; 364 break; 365 #ifdef INET6 366 case '6': 367 family = PF_INET6; 368 break; 369 #endif 370 case '8': 371 mask_C1 = 0; 372 break; 373 case 'A': 374 send_to_all++; 375 break; 376 case 'a': /* allow specific network addresses only */ 377 if (allowaddr(optarg) == -1) 378 usage(); 379 break; 380 case 'b': 381 bindhostname = optarg; 382 break; 383 case 'c': 384 no_compress++; 385 break; 386 case 'C': 387 logflags |= O_CREAT; 388 break; 389 case 'd': /* debug */ 390 Debug++; 391 break; 392 case 'f': /* configuration file */ 393 ConfFile = optarg; 394 break; 395 case 'k': /* keep remote kern fac */ 396 KeepKernFac = 1; 397 break; 398 case 'l': 399 { 400 long perml; 401 mode_t mode; 402 char *name, *ep; 403 404 if (optarg[0] == '/') { 405 mode = DEFFILEMODE; 406 name = optarg; 407 } else if ((name = strchr(optarg, ':')) != NULL) { 408 *name++ = '\0'; 409 if (name[0] != '/') 410 errx(1, "socket name must be absolute " 411 "path"); 412 if (isdigit(*optarg)) { 413 perml = strtol(optarg, &ep, 8); 414 if (*ep || perml < 0 || 415 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 416 errx(1, "invalid mode %s, exiting", 417 optarg); 418 mode = (mode_t )perml; 419 } else 420 errx(1, "invalid mode %s, exiting", 421 optarg); 422 } else /* doesn't begin with '/', and no ':' */ 423 errx(1, "can't parse path %s", optarg); 424 425 if (strlen(name) >= sizeof(sunx.sun_path)) 426 errx(1, "%s path too long, exiting", name); 427 if ((fx = malloc(sizeof(struct funix))) == NULL) 428 errx(1, "malloc failed"); 429 fx->s = -1; 430 fx->name = name; 431 fx->mode = mode; 432 STAILQ_INSERT_TAIL(&funixes, fx, next); 433 break; 434 } 435 case 'm': /* mark interval */ 436 MarkInterval = atoi(optarg) * 60; 437 break; 438 case 'n': 439 resolve = 0; 440 break; 441 case 'o': 442 use_bootfile = 1; 443 break; 444 case 'p': /* path */ 445 if (strlen(optarg) >= sizeof(sunx.sun_path)) 446 errx(1, "%s path too long, exiting", optarg); 447 funix_default.name = optarg; 448 break; 449 case 'P': /* path for alt. PID */ 450 PidFile = optarg; 451 break; 452 case 's': /* no network mode */ 453 SecureMode++; 454 break; 455 case 'S': /* path for privileged originator */ 456 if (strlen(optarg) >= sizeof(sunx.sun_path)) 457 errx(1, "%s path too long, exiting", optarg); 458 funix_secure.name = optarg; 459 break; 460 case 'T': 461 RemoteAddDate = 1; 462 break; 463 case 'u': /* only log specified priority */ 464 UniquePriority++; 465 break; 466 case 'v': /* log facility and priority */ 467 LogFacPri++; 468 break; 469 default: 470 usage(); 471 } 472 if ((argc -= optind) != 0) 473 usage(); 474 475 pfh = pidfile_open(PidFile, 0600, &spid); 476 if (pfh == NULL) { 477 if (errno == EEXIST) 478 errx(1, "syslogd already running, pid: %d", spid); 479 warn("cannot open pid file"); 480 } 481 482 if (!Debug) { 483 ppid = waitdaemon(0, 0, 30); 484 if (ppid < 0) { 485 warn("could not become daemon"); 486 pidfile_remove(pfh); 487 exit(1); 488 } 489 } else { 490 setlinebuf(stdout); 491 } 492 493 if (NumAllowed) 494 endservent(); 495 496 consfile.f_type = F_CONSOLE; 497 strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 498 sizeof(consfile.f_un.f_fname)); 499 strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 500 signal(SIGTERM, dodie); 501 signal(SIGINT, Debug ? dodie : SIG_IGN); 502 signal(SIGQUIT, Debug ? dodie : SIG_IGN); 503 /* 504 * We don't want the SIGCHLD and SIGHUP handlers to interfere 505 * with each other; they are likely candidates for being called 506 * simultaneously (SIGHUP closes pipe descriptor, process dies, 507 * SIGCHLD happens). 508 */ 509 sigemptyset(&mask); 510 sigaddset(&mask, SIGHUP); 511 sact.sa_handler = reapchild; 512 sact.sa_mask = mask; 513 sact.sa_flags = SA_RESTART; 514 sigaction(SIGCHLD, &sact, NULL); 515 signal(SIGALRM, domark); 516 signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 517 alarm(TIMERINTVL); 518 519 TAILQ_INIT(&deadq_head); 520 521 #ifndef SUN_LEN 522 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 523 #endif 524 STAILQ_FOREACH_MUTABLE(fx, &funixes, next, fx1) { 525 unlink(fx->name); 526 memset(&sunx, 0, sizeof(sunx)); 527 sunx.sun_family = AF_LOCAL; 528 strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 529 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 530 if (fx->s < 0 || 531 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 532 chmod(fx->name, fx->mode) < 0) { 533 snprintf(line, sizeof line, 534 "cannot create %s", fx->name); 535 logerror(line); 536 dprintf("cannot create %s (%d)\n", fx->name, errno); 537 if (fx == &funix_default || fx == &funix_secure) 538 die(0); 539 else { 540 STAILQ_REMOVE(&funixes, fx, funix, next); 541 continue; 542 } 543 double_rbuf(fx->s); 544 } 545 } 546 if (SecureMode <= 1) 547 finet = socksetup(family, bindhostname); 548 549 if (finet) { 550 if (SecureMode) { 551 for (i = 0; i < *finet; i++) { 552 if (shutdown(finet[i+1], SHUT_RD) < 0) { 553 logerror("shutdown"); 554 if (!Debug) 555 die(0); 556 } 557 } 558 } else { 559 dprintf("listening on inet and/or inet6 socket\n"); 560 } 561 dprintf("sending on inet and/or inet6 socket\n"); 562 } 563 564 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 565 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 566 fklog = -1; 567 if (fklog < 0) 568 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 569 570 /* tuck my process id away */ 571 pidfile_write(pfh); 572 573 dprintf("off & running....\n"); 574 575 init(0); 576 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 577 sigemptyset(&mask); 578 sigaddset(&mask, SIGCHLD); 579 sact.sa_handler = init; 580 sact.sa_mask = mask; 581 sact.sa_flags = SA_RESTART; 582 sigaction(SIGHUP, &sact, NULL); 583 584 tvp = &tv; 585 tv.tv_sec = tv.tv_usec = 0; 586 587 if (fklog != -1 && fklog > fdsrmax) 588 fdsrmax = fklog; 589 if (finet && !SecureMode) { 590 for (i = 0; i < *finet; i++) { 591 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 592 fdsrmax = finet[i+1]; 593 } 594 } 595 STAILQ_FOREACH(fx, &funixes, next) 596 if (fx->s > fdsrmax) 597 fdsrmax = fx->s; 598 599 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 600 sizeof(fd_mask)); 601 if (fdsr == NULL) 602 errx(1, "calloc fd_set"); 603 604 for (;;) { 605 if (MarkSet) 606 markit(); 607 if (WantDie) 608 die(WantDie); 609 610 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 611 sizeof(fd_mask)); 612 613 if (fklog != -1) 614 FD_SET(fklog, fdsr); 615 if (finet && !SecureMode) { 616 for (i = 0; i < *finet; i++) { 617 if (finet[i+1] != -1) 618 FD_SET(finet[i+1], fdsr); 619 } 620 } 621 STAILQ_FOREACH(fx, &funixes, next) 622 FD_SET(fx->s, fdsr); 623 624 i = select(fdsrmax+1, fdsr, NULL, NULL, 625 needdofsync ? &tv : tvp); 626 switch (i) { 627 case 0: 628 dofsync(); 629 needdofsync = 0; 630 if (tvp) { 631 tvp = NULL; 632 if (ppid != 1) 633 kill(ppid, SIGALRM); 634 } 635 continue; 636 case -1: 637 if (errno != EINTR) 638 logerror("select"); 639 continue; 640 } 641 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 642 readklog(); 643 if (finet && !SecureMode) { 644 for (i = 0; i < *finet; i++) { 645 if (FD_ISSET(finet[i+1], fdsr)) { 646 len = sizeof(frominet); 647 l = recvfrom(finet[i+1], line, MAXLINE, 648 0, (struct sockaddr *)&frominet, 649 &len); 650 if (l > 0) { 651 line[l] = '\0'; 652 hname = cvthname((struct sockaddr *)&frominet); 653 unmapped((struct sockaddr *)&frominet); 654 if (validate((struct sockaddr *)&frominet, hname)) 655 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 656 } else if (l < 0 && errno != EINTR) 657 logerror("recvfrom inet"); 658 } 659 } 660 } 661 STAILQ_FOREACH(fx, &funixes, next) { 662 if (FD_ISSET(fx->s, fdsr)) { 663 len = sizeof(fromunix); 664 l = recvfrom(fx->s, line, MAXLINE, 0, 665 (struct sockaddr *)&fromunix, &len); 666 if (l > 0) { 667 line[l] = '\0'; 668 printline(LocalHostName, line, 0); 669 } else if (l < 0 && errno != EINTR) 670 logerror("recvfrom unix"); 671 } 672 } 673 } 674 if (fdsr) 675 free(fdsr); 676 } 677 678 static void 679 unmapped(struct sockaddr *sa) 680 { 681 struct sockaddr_in6 *sin6; 682 struct sockaddr_in sin4; 683 684 if (sa->sa_family != AF_INET6) 685 return; 686 if (sa->sa_len != sizeof(struct sockaddr_in6) || 687 sizeof(sin4) > sa->sa_len) 688 return; 689 sin6 = (struct sockaddr_in6 *)sa; 690 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 691 return; 692 693 memset(&sin4, 0, sizeof(sin4)); 694 sin4.sin_family = AF_INET; 695 sin4.sin_len = sizeof(struct sockaddr_in); 696 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 697 sizeof(sin4.sin_addr)); 698 sin4.sin_port = sin6->sin6_port; 699 700 memcpy(sa, &sin4, sin4.sin_len); 701 } 702 703 static void 704 usage(void) 705 { 706 707 fprintf(stderr, "%s\n%s\n%s\n%s\n", 708 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 709 " [-b bind_address] [-f config_file]", 710 " [-l [mode:]path] [-m mark_interval]", 711 " [-P pid_file] [-p log_socket]"); 712 exit(1); 713 } 714 715 /* 716 * Take a raw input line, decode the message, and print the message 717 * on the appropriate log files. 718 */ 719 static void 720 printline(const char *hname, char *msg, int flags) 721 { 722 char *p, *q; 723 long n; 724 int c, pri; 725 char line[MAXLINE + 1]; 726 727 /* test for special codes */ 728 p = msg; 729 pri = DEFUPRI; 730 if (*p == '<') { 731 errno = 0; 732 n = strtol(p + 1, &q, 10); 733 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 734 p = q + 1; 735 pri = n; 736 } 737 } 738 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 739 pri = DEFUPRI; 740 741 /* 742 * Don't allow users to log kernel messages. 743 * NOTE: since LOG_KERN == 0 this will also match 744 * messages with no facility specified. 745 */ 746 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 747 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 748 749 q = line; 750 751 while ((c = (unsigned char)*p++) != '\0' && 752 q < &line[sizeof(line) - 4]) { 753 if (mask_C1 && (c & 0x80) && c < 0xA0) { 754 c &= 0x7F; 755 *q++ = 'M'; 756 *q++ = '-'; 757 } 758 if (isascii(c) && iscntrl(c)) { 759 if (c == '\n') { 760 *q++ = ' '; 761 } else if (c == '\t') { 762 *q++ = '\t'; 763 } else { 764 *q++ = '^'; 765 *q++ = c ^ 0100; 766 } 767 } else { 768 *q++ = c; 769 } 770 } 771 *q = '\0'; 772 773 logmsg(pri, line, hname, flags); 774 } 775 776 /* 777 * Read /dev/klog while data are available, split into lines. 778 */ 779 static void 780 readklog(void) 781 { 782 char *p, *q, line[MAXLINE + 1]; 783 int len, i; 784 785 len = 0; 786 for (;;) { 787 i = read(fklog, line + len, MAXLINE - 1 - len); 788 if (i > 0) { 789 line[i + len] = '\0'; 790 } else { 791 if (i < 0 && errno != EINTR && errno != EAGAIN) { 792 logerror("klog"); 793 fklog = -1; 794 } 795 break; 796 } 797 798 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 799 *q = '\0'; 800 printsys(p); 801 } 802 len = strlen(p); 803 if (len >= MAXLINE - 1) { 804 printsys(p); 805 len = 0; 806 } 807 if (len > 0) 808 memmove(line, p, len + 1); 809 } 810 if (len > 0) 811 printsys(line); 812 } 813 814 /* 815 * Take a raw input line from /dev/klog, format similar to syslog(). 816 */ 817 static void 818 printsys(char *msg) 819 { 820 char *p, *q; 821 long n; 822 int flags, isprintf, pri; 823 824 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 825 p = msg; 826 pri = DEFSPRI; 827 isprintf = 1; 828 if (*p == '<') { 829 errno = 0; 830 n = strtol(p + 1, &q, 10); 831 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 832 p = q + 1; 833 pri = n; 834 isprintf = 0; 835 } 836 } 837 /* 838 * Kernel printf's and LOG_CONSOLE messages have been displayed 839 * on the console already. 840 */ 841 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 842 flags |= IGN_CONS; 843 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 844 pri = DEFSPRI; 845 logmsg(pri, p, LocalHostName, flags); 846 } 847 848 static time_t now; 849 850 /* 851 * Match a program or host name against a specification. 852 * Return a non-0 value if the message must be ignored 853 * based on the specification. 854 */ 855 static int 856 skip_message(const char *name, const char *spec, int checkcase) 857 { 858 const char *s; 859 char prev, next; 860 int exclude = 0; 861 /* Behaviour on explicit match */ 862 863 if (spec == NULL) 864 return 0; 865 switch (*spec) { 866 case '-': 867 exclude = 1; 868 /*FALLTHROUGH*/ 869 case '+': 870 spec++; 871 break; 872 default: 873 break; 874 } 875 if (checkcase) 876 s = strstr (spec, name); 877 else 878 s = strcasestr (spec, name); 879 880 if (s != NULL) { 881 prev = (s == spec ? ',' : *(s - 1)); 882 next = *(s + strlen (name)); 883 884 if (prev == ',' && (next == '\0' || next == ',')) 885 /* Explicit match: skip iff the spec is an 886 exclusive one. */ 887 return exclude; 888 } 889 890 /* No explicit match for this name: skip the message iff 891 the spec is an inclusive one. */ 892 return !exclude; 893 } 894 895 /* 896 * Log a message to the appropriate log files, users, etc. based on 897 * the priority. 898 */ 899 static void 900 logmsg(int pri, const char *msg, const char *from, int flags) 901 { 902 struct filed *f; 903 int i, fac, msglen, omask, prilev; 904 const char *timestamp; 905 char prog[NAME_MAX+1]; 906 char buf[MAXLINE+1]; 907 908 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 909 pri, flags, from, msg); 910 911 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 912 913 /* 914 * Check to see if msg looks non-standard. 915 */ 916 msglen = strlen(msg); 917 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 918 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 919 flags |= ADDDATE; 920 921 time(&now); 922 if (flags & ADDDATE) { 923 timestamp = ctime(&now) + 4; 924 } else { 925 timestamp = msg; 926 msg += 16; 927 msglen -= 16; 928 } 929 930 /* skip leading blanks */ 931 while (isspace(*msg)) { 932 msg++; 933 msglen--; 934 } 935 936 /* extract facility and priority level */ 937 if (flags & MARK) 938 fac = LOG_NFACILITIES; 939 else 940 fac = LOG_FAC(pri); 941 942 /* Check maximum facility number. */ 943 if (fac > LOG_NFACILITIES) { 944 sigsetmask(omask); 945 return; 946 } 947 948 prilev = LOG_PRI(pri); 949 950 /* extract program name */ 951 for (i = 0; i < NAME_MAX; i++) { 952 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 953 msg[i] == '/' || isspace(msg[i])) 954 break; 955 prog[i] = msg[i]; 956 } 957 prog[i] = 0; 958 959 /* add kernel prefix for kernel messages */ 960 if (flags & ISKERNEL) { 961 snprintf(buf, sizeof(buf), "%s: %s", 962 use_bootfile ? bootfile : "kernel", msg); 963 msg = buf; 964 msglen = strlen(buf); 965 } 966 967 /* log the message to the particular outputs */ 968 if (!Initialized) { 969 f = &consfile; 970 /* 971 * Open in non-blocking mode to avoid hangs during open 972 * and close(waiting for the port to drain). 973 */ 974 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 975 976 if (f->f_file >= 0) { 977 strlcpy(f->f_lasttime, timestamp, 978 sizeof(f->f_lasttime)); 979 fprintlog(f, flags, msg); 980 close(f->f_file); 981 } 982 sigsetmask(omask); 983 return; 984 } 985 for (f = Files; f; f = f->f_next) { 986 /* skip messages that are incorrect priority */ 987 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 988 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 989 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 990 ) 991 || f->f_pmask[fac] == INTERNAL_NOPRI) 992 continue; 993 994 /* skip messages with the incorrect hostname */ 995 if (skip_message(from, f->f_host, 0)) 996 continue; 997 998 /* skip messages with the incorrect program name */ 999 if (skip_message(prog, f->f_program, 1)) 1000 continue; 1001 1002 /* skip message to console if it has already been printed */ 1003 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1004 continue; 1005 1006 /* don't output marks to recently written files */ 1007 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1008 continue; 1009 1010 /* 1011 * suppress duplicate lines to this file 1012 */ 1013 if (no_compress - (f->f_type != F_PIPE) < 1 && 1014 (flags & MARK) == 0 && msglen == f->f_prevlen && 1015 f->f_prevline && !strcmp(msg, f->f_prevline) && 1016 !strcasecmp(from, f->f_prevhost)) { 1017 strlcpy(f->f_lasttime, timestamp, 1018 sizeof(f->f_lasttime)); 1019 f->f_prevcount++; 1020 dprintf("msg repeated %d times, %ld sec of %d\n", 1021 f->f_prevcount, (long)(now - f->f_time), 1022 repeatinterval[f->f_repeatcount]); 1023 /* 1024 * If domark would have logged this by now, 1025 * flush it now (so we don't hold isolated messages), 1026 * but back off so we'll flush less often 1027 * in the future. 1028 */ 1029 if (now > REPEATTIME(f)) { 1030 fprintlog(f, flags, NULL); 1031 BACKOFF(f); 1032 } 1033 } else { 1034 /* new line, save it */ 1035 if (f->f_prevcount) 1036 fprintlog(f, 0, NULL); 1037 f->f_repeatcount = 0; 1038 f->f_prevpri = pri; 1039 strlcpy(f->f_lasttime, timestamp, 1040 sizeof(f->f_lasttime)); 1041 strlcpy(f->f_prevhost, from, sizeof(f->f_prevhost)); 1042 if (msglen < MAXSVLINE) { 1043 f->f_prevlen = msglen; 1044 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1045 fprintlog(f, flags, NULL); 1046 } else { 1047 f->f_prevline[0] = 0; 1048 f->f_prevlen = 0; 1049 fprintlog(f, flags, msg); 1050 } 1051 } 1052 } 1053 sigsetmask(omask); 1054 } 1055 1056 static void 1057 dofsync(void) 1058 { 1059 struct filed *f; 1060 1061 for (f = Files; f; f = f->f_next) { 1062 if ((f->f_type == F_FILE) && 1063 (f->f_flags & FFLAG_NEEDSYNC)) { 1064 f->f_flags &= ~FFLAG_NEEDSYNC; 1065 fsync(f->f_file); 1066 } 1067 } 1068 } 1069 1070 #define IOV_SIZE 7 1071 static void 1072 fprintlog(struct filed *f, int flags, const char *msg) 1073 { 1074 struct iovec iov[IOV_SIZE]; 1075 struct iovec *v; 1076 struct addrinfo *r; 1077 int i, l, lsent = 0; 1078 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1079 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1080 const char *msgret; 1081 1082 v = iov; 1083 if (f->f_type == F_WALL) { 1084 v->iov_base = greetings; 1085 /* The time displayed is not synchornized with the other log 1086 * destinations (like messages). Following fragment was using 1087 * ctime(&now), which was updating the time every 30 sec. 1088 * With f_lasttime, time is synchronized correctly. 1089 */ 1090 v->iov_len = snprintf(greetings, sizeof greetings, 1091 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1092 f->f_prevhost, f->f_lasttime); 1093 if (v->iov_len > 0) 1094 v++; 1095 v->iov_base = nul; 1096 v->iov_len = 0; 1097 v++; 1098 } else { 1099 v->iov_base = f->f_lasttime; 1100 v->iov_len = strlen(f->f_lasttime); 1101 v++; 1102 v->iov_base = space; 1103 v->iov_len = 1; 1104 v++; 1105 } 1106 1107 if (LogFacPri) { 1108 static char fp_buf[30]; /* Hollow laugh */ 1109 int fac = f->f_prevpri & LOG_FACMASK; 1110 int pri = LOG_PRI(f->f_prevpri); 1111 const char *f_s = NULL; 1112 char f_n[5]; /* Hollow laugh */ 1113 const char *p_s = NULL; 1114 char p_n[5]; /* Hollow laugh */ 1115 1116 if (LogFacPri > 1) { 1117 CODE *c; 1118 1119 for (c = facilitynames; c->c_name; c++) { 1120 if (c->c_val == fac) { 1121 f_s = c->c_name; 1122 break; 1123 } 1124 } 1125 for (c = prioritynames; c->c_name; c++) { 1126 if (c->c_val == pri) { 1127 p_s = c->c_name; 1128 break; 1129 } 1130 } 1131 } 1132 if (!f_s) { 1133 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1134 f_s = f_n; 1135 } 1136 if (!p_s) { 1137 snprintf(p_n, sizeof p_n, "%d", pri); 1138 p_s = p_n; 1139 } 1140 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1141 v->iov_base = fp_buf; 1142 v->iov_len = strlen(fp_buf); 1143 } else { 1144 v->iov_base = nul; 1145 v->iov_len = 0; 1146 } 1147 v++; 1148 1149 v->iov_base = f->f_prevhost; 1150 v->iov_len = strlen(v->iov_base); 1151 v++; 1152 v->iov_base = space; 1153 v->iov_len = 1; 1154 v++; 1155 1156 if (msg) { 1157 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1158 if (wmsg == NULL) { 1159 logerror("strdup"); 1160 exit(1); 1161 } 1162 v->iov_base = wmsg; 1163 v->iov_len = strlen(msg); 1164 } else if (f->f_prevcount > 1) { 1165 v->iov_base = repbuf; 1166 v->iov_len = snprintf(repbuf, sizeof repbuf, 1167 "last message repeated %d times", f->f_prevcount); 1168 } else if (f->f_prevline) { 1169 v->iov_base = f->f_prevline; 1170 v->iov_len = f->f_prevlen; 1171 } else { 1172 return; 1173 } 1174 v++; 1175 1176 dprintf("Logging to %s", TypeNames[f->f_type]); 1177 f->f_time = now; 1178 1179 switch (f->f_type) { 1180 int port; 1181 case F_UNUSED: 1182 dprintf("\n"); 1183 break; 1184 1185 case F_FORW: 1186 port = (int)ntohs(((struct sockaddr_in *) 1187 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1188 if (port != 514) { 1189 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1190 } else { 1191 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1192 } 1193 /* check for local vs remote messages */ 1194 if (strcasecmp(f->f_prevhost, LocalHostName)) 1195 l = snprintf(line, sizeof line - 1, 1196 "<%d>%.15s Forwarded from %s: %s", 1197 f->f_prevpri, (char *)iov[0].iov_base, 1198 f->f_prevhost, (char *)iov[5].iov_base); 1199 else 1200 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1201 f->f_prevpri, (char *)iov[0].iov_base, 1202 (char *)iov[5].iov_base); 1203 if (l < 0) 1204 l = 0; 1205 else if (l > MAXLINE) 1206 l = MAXLINE; 1207 1208 if (finet) { 1209 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1210 for (i = 0; i < *finet; i++) { 1211 #if 0 1212 /* 1213 * should we check AF first, or just 1214 * trial and error? FWD 1215 */ 1216 if (r->ai_family == 1217 address_family_of(finet[i+1])) 1218 #endif 1219 lsent = sendto(finet[i+1], line, l, 0, 1220 r->ai_addr, r->ai_addrlen); 1221 if (lsent == l) 1222 break; 1223 } 1224 if (lsent == l && !send_to_all) 1225 break; 1226 } 1227 dprintf("lsent/l: %d/%d\n", lsent, l); 1228 if (lsent != l) { 1229 int e = errno; 1230 logerror("sendto"); 1231 errno = e; 1232 switch (errno) { 1233 case ENOBUFS: 1234 case ENETDOWN: 1235 case EHOSTUNREACH: 1236 case EHOSTDOWN: 1237 break; 1238 /* case EBADF: */ 1239 /* case EACCES: */ 1240 /* case ENOTSOCK: */ 1241 /* case EFAULT: */ 1242 /* case EMSGSIZE: */ 1243 /* case EAGAIN: */ 1244 /* case ENOBUFS: */ 1245 /* case ECONNREFUSED: */ 1246 default: 1247 dprintf("removing entry\n"); 1248 f->f_type = F_UNUSED; 1249 break; 1250 } 1251 } 1252 } 1253 break; 1254 1255 case F_FILE: 1256 dprintf(" %s\n", f->f_un.f_fname); 1257 v->iov_base = lf; 1258 v->iov_len = 1; 1259 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1260 /* 1261 * If writev(2) fails for potentially transient errors 1262 * like the filesystem being full, ignore it. 1263 * Otherwise remove this logfile from the list. 1264 */ 1265 if (errno != ENOSPC) { 1266 int e = errno; 1267 close(f->f_file); 1268 f->f_type = F_UNUSED; 1269 errno = e; 1270 logerror(f->f_un.f_fname); 1271 } 1272 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1273 f->f_flags |= FFLAG_NEEDSYNC; 1274 needdofsync = 1; 1275 } 1276 break; 1277 1278 case F_RING: 1279 dprintf(" %s\n", f->f_un.f_ring.f_rname); 1280 v->iov_base = lf; 1281 v->iov_len = 1; 1282 if (rbwritev(f, iov, 7) == -1) { 1283 int e = errno; 1284 munmap(f->f_un.f_ring.f_footer, 1285 sizeof(struct clog_footer)); 1286 close(f->f_file); 1287 f->f_type = F_UNUSED; 1288 errno = e; 1289 logerror(f->f_un.f_fname); 1290 } 1291 break; 1292 1293 case F_PIPE: 1294 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1295 v->iov_base = lf; 1296 v->iov_len = 1; 1297 if (f->f_un.f_pipe.f_pid == 0) { 1298 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1299 &f->f_un.f_pipe.f_pid)) < 0) { 1300 f->f_type = F_UNUSED; 1301 logerror(f->f_un.f_pipe.f_pname); 1302 break; 1303 } 1304 } 1305 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1306 int e = errno; 1307 close(f->f_file); 1308 if (f->f_un.f_pipe.f_pid > 0) 1309 deadq_enter(f->f_un.f_pipe.f_pid, 1310 f->f_un.f_pipe.f_pname); 1311 f->f_un.f_pipe.f_pid = 0; 1312 errno = e; 1313 logerror(f->f_un.f_pipe.f_pname); 1314 } 1315 break; 1316 1317 case F_CONSOLE: 1318 if (flags & IGN_CONS) { 1319 dprintf(" (ignored)\n"); 1320 break; 1321 } 1322 /* FALLTHROUGH */ 1323 1324 case F_TTY: 1325 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1326 v->iov_base = crlf; 1327 v->iov_len = 2; 1328 1329 errno = 0; /* ttymsg() only sometimes returns an errno */ 1330 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1331 f->f_type = F_UNUSED; 1332 logerror(msgret); 1333 } 1334 break; 1335 1336 case F_USERS: 1337 case F_WALL: 1338 dprintf("\n"); 1339 v->iov_base = crlf; 1340 v->iov_len = 2; 1341 wallmsg(f, iov, IOV_SIZE); 1342 break; 1343 } 1344 f->f_prevcount = 0; 1345 free(wmsg); 1346 } 1347 1348 /* 1349 * WALLMSG -- Write a message to the world at large 1350 * 1351 * Write the specified message to either the entire 1352 * world, or a list of approved users. 1353 */ 1354 static void 1355 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1356 { 1357 static int reenter; /* avoid calling ourselves */ 1358 1359 struct utmpentry *ep; 1360 int i; 1361 const char *p; 1362 1363 if (reenter++) 1364 return; 1365 1366 getutentries(NULL, &ep); 1367 if (ep == NULL) { 1368 logerror("getutentries"); 1369 reenter = 0; 1370 return; 1371 } 1372 /* NOSTRICT */ 1373 for (; ep; ep = ep->next) { 1374 /* We must use strncpy since ut_* may not be NUL terminated. */ 1375 if (f->f_type == F_WALL) { 1376 if ((p = ttymsg(iov, iovlen, ep->line, TTYMSGTIME)) != 1377 NULL) { 1378 errno = 0; /* already in msg */ 1379 logerror(p); 1380 } 1381 continue; 1382 } 1383 /* should we send the message to this user? */ 1384 for (i = 0; i < MAXUNAMES; i++) { 1385 if (!f->f_un.f_uname[i][0]) 1386 break; 1387 if (!strcmp(f->f_un.f_uname[i], ep->name)) { 1388 if ((p = ttymsg(iov, iovlen, ep->line, TTYMSGTIME)) 1389 != NULL) { 1390 errno = 0; /* already in msg */ 1391 logerror(p); 1392 } 1393 break; 1394 } 1395 } 1396 } 1397 reenter = 0; 1398 } 1399 1400 static void 1401 reapchild(int signo __unused) 1402 { 1403 int status; 1404 pid_t pid; 1405 struct filed *f; 1406 1407 while ((pid = wait3(&status, WNOHANG, NULL)) > 0) { 1408 if (!Initialized) 1409 /* Don't tell while we are initting. */ 1410 continue; 1411 1412 /* First, look if it's a process from the dead queue. */ 1413 if (deadq_remove(pid)) 1414 goto oncemore; 1415 1416 /* Now, look in list of active processes. */ 1417 for (f = Files; f; f = f->f_next) 1418 if (f->f_type == F_PIPE && 1419 f->f_un.f_pipe.f_pid == pid) { 1420 close(f->f_file); 1421 f->f_un.f_pipe.f_pid = 0; 1422 log_deadchild(pid, status, 1423 f->f_un.f_pipe.f_pname); 1424 break; 1425 } 1426 oncemore: 1427 continue; 1428 } 1429 } 1430 1431 /* 1432 * Return a printable representation of a host address. 1433 */ 1434 static const char * 1435 cvthname(struct sockaddr *f) 1436 { 1437 int error, hl; 1438 sigset_t omask, nmask; 1439 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1440 1441 error = getnameinfo((struct sockaddr *)f, 1442 ((struct sockaddr *)f)->sa_len, 1443 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1444 dprintf("cvthname(%s)\n", ip); 1445 1446 if (error) { 1447 dprintf("Malformed from address %s\n", gai_strerror(error)); 1448 return ("???"); 1449 } 1450 if (!resolve) 1451 return (ip); 1452 1453 sigemptyset(&nmask); 1454 sigaddset(&nmask, SIGHUP); 1455 sigprocmask(SIG_BLOCK, &nmask, &omask); 1456 error = getnameinfo((struct sockaddr *)f, 1457 ((struct sockaddr *)f)->sa_len, 1458 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1459 sigprocmask(SIG_SETMASK, &omask, NULL); 1460 if (error) { 1461 dprintf("Host name for your address (%s) unknown\n", ip); 1462 return (ip); 1463 } 1464 hl = strlen(hname); 1465 if (hl > 0 && hname[hl-1] == '.') 1466 hname[--hl] = '\0'; 1467 trimdomain(hname, hl); 1468 return (hname); 1469 } 1470 1471 static void 1472 dodie(int signo) 1473 { 1474 1475 WantDie = signo; 1476 } 1477 1478 static void 1479 domark(int signo __unused) 1480 { 1481 1482 MarkSet = 1; 1483 } 1484 1485 /* 1486 * Print syslogd errors some place. 1487 */ 1488 static void 1489 logerror(const char *type) 1490 { 1491 char buf[512]; 1492 static int recursed = 0; 1493 1494 /* If there's an error while trying to log an error, give up. */ 1495 if (recursed) 1496 return; 1497 recursed++; 1498 if (errno) 1499 snprintf(buf, 1500 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1501 else 1502 snprintf(buf, sizeof buf, "syslogd: %s", type); 1503 errno = 0; 1504 dprintf("%s\n", buf); 1505 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1506 recursed--; 1507 } 1508 1509 static void 1510 die(int signo) 1511 { 1512 struct filed *f; 1513 struct funix *fx; 1514 int was_initialized; 1515 char buf[100]; 1516 1517 was_initialized = Initialized; 1518 Initialized = 0; /* Don't log SIGCHLDs. */ 1519 for (f = Files; f != NULL; f = f->f_next) { 1520 /* flush any pending output */ 1521 if (f->f_prevcount) 1522 fprintlog(f, 0, NULL); 1523 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1524 close(f->f_file); 1525 f->f_un.f_pipe.f_pid = 0; 1526 } 1527 } 1528 Initialized = was_initialized; 1529 if (signo) { 1530 dprintf("syslogd: exiting on signal %d\n", signo); 1531 snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1532 errno = 0; 1533 logerror(buf); 1534 } 1535 STAILQ_FOREACH(fx, &funixes, next) 1536 unlink(fx->name); 1537 pidfile_remove(pfh); 1538 1539 exit(1); 1540 } 1541 1542 /* 1543 * INIT -- Initialize syslogd from configuration table 1544 */ 1545 static void 1546 init(int signo) 1547 { 1548 int i; 1549 FILE *cf; 1550 struct filed *f, *next, **nextp; 1551 char *p; 1552 char cline[LINE_MAX]; 1553 char prog[NAME_MAX+1]; 1554 char host[MAXHOSTNAMELEN]; 1555 char oldLocalHostName[MAXHOSTNAMELEN]; 1556 char hostMsg[2*MAXHOSTNAMELEN+40]; 1557 char bootfileMsg[LINE_MAX]; 1558 1559 dprintf("init\n"); 1560 1561 /* 1562 * Load hostname (may have changed). 1563 */ 1564 if (signo != 0) 1565 strlcpy(oldLocalHostName, LocalHostName, 1566 sizeof(oldLocalHostName)); 1567 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1568 err(EX_OSERR, "gethostname() failed"); 1569 if ((p = strchr(LocalHostName, '.')) != NULL) { 1570 *p++ = '\0'; 1571 LocalDomain = p; 1572 } else { 1573 LocalDomain = ""; 1574 } 1575 1576 /* 1577 * Close all open log files. 1578 */ 1579 Initialized = 0; 1580 for (f = Files; f != NULL; f = next) { 1581 /* flush any pending output */ 1582 if (f->f_prevcount) 1583 fprintlog(f, 0, NULL); 1584 1585 switch (f->f_type) { 1586 case F_FILE: 1587 case F_FORW: 1588 case F_CONSOLE: 1589 case F_TTY: 1590 close(f->f_file); 1591 break; 1592 case F_PIPE: 1593 if (f->f_un.f_pipe.f_pid > 0) { 1594 close(f->f_file); 1595 deadq_enter(f->f_un.f_pipe.f_pid, 1596 f->f_un.f_pipe.f_pname); 1597 } 1598 f->f_un.f_pipe.f_pid = 0; 1599 break; 1600 case F_RING: 1601 munmap(f->f_un.f_ring.f_footer, 1602 sizeof(struct clog_footer)); 1603 close(f->f_file); 1604 break; 1605 } 1606 next = f->f_next; 1607 if (f->f_program) free(f->f_program); 1608 if (f->f_host) free(f->f_host); 1609 free((char *)f); 1610 } 1611 Files = NULL; 1612 nextp = &Files; 1613 1614 /* open the configuration file */ 1615 if ((cf = fopen(ConfFile, "r")) == NULL) { 1616 dprintf("cannot open %s\n", ConfFile); 1617 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1618 if (*nextp == NULL) { 1619 logerror("calloc"); 1620 exit(1); 1621 } 1622 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1623 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1624 if ((*nextp)->f_next == NULL) { 1625 logerror("calloc"); 1626 exit(1); 1627 } 1628 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1629 Initialized = 1; 1630 return; 1631 } 1632 1633 /* 1634 * Foreach line in the conf table, open that file. 1635 */ 1636 f = NULL; 1637 strlcpy(host, "*", sizeof(host)); 1638 strlcpy(prog, "*", sizeof(prog)); 1639 while (fgets(cline, sizeof(cline), cf) != NULL) { 1640 /* 1641 * check for end-of-section, comments, strip off trailing 1642 * spaces and newline character. #!prog is treated specially: 1643 * following lines apply only to that program. 1644 */ 1645 for (p = cline; isspace(*p); ++p) 1646 continue; 1647 if (*p == 0) 1648 continue; 1649 if (*p == '#') { 1650 p++; 1651 if (*p != '!' && *p != '+' && *p != '-') 1652 continue; 1653 } 1654 if (*p == '+' || *p == '-') { 1655 host[0] = *p++; 1656 while (isspace(*p)) 1657 p++; 1658 if ((!*p) || (*p == '*')) { 1659 strlcpy(host, "*", sizeof(host)); 1660 continue; 1661 } 1662 if (*p == '@') 1663 p = LocalHostName; 1664 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1665 if (!isalnum(*p) && *p != '.' && *p != '-' 1666 && *p != ',' && *p != ':' && *p != '%') 1667 break; 1668 host[i] = *p++; 1669 } 1670 host[i] = '\0'; 1671 continue; 1672 } 1673 if (*p == '!') { 1674 p++; 1675 while (isspace(*p)) p++; 1676 if ((!*p) || (*p == '*')) { 1677 strlcpy(prog, "*", sizeof(prog)); 1678 continue; 1679 } 1680 for (i = 0; i < NAME_MAX; i++) { 1681 if (!isprint(p[i]) || isspace(p[i])) 1682 break; 1683 prog[i] = p[i]; 1684 } 1685 prog[i] = 0; 1686 continue; 1687 } 1688 for (p = cline + 1; *p != '\0'; p++) { 1689 if (*p != '#') 1690 continue; 1691 if (*(p - 1) == '\\') { 1692 strcpy(p - 1, p); 1693 p--; 1694 continue; 1695 } 1696 *p = '\0'; 1697 break; 1698 } 1699 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1700 cline[i] = '\0'; 1701 f = (struct filed *)calloc(1, sizeof(*f)); 1702 if (f == NULL) { 1703 logerror("calloc"); 1704 exit(1); 1705 } 1706 *nextp = f; 1707 nextp = &f->f_next; 1708 cfline(cline, f, prog, host); 1709 } 1710 1711 /* close the configuration file */ 1712 fclose(cf); 1713 1714 Initialized = 1; 1715 1716 if (Debug) { 1717 int port; 1718 for (f = Files; f; f = f->f_next) { 1719 for (i = 0; i <= LOG_NFACILITIES; i++) 1720 if (f->f_pmask[i] == INTERNAL_NOPRI) 1721 printf("X "); 1722 else 1723 printf("%d ", f->f_pmask[i]); 1724 printf("%s: ", TypeNames[f->f_type]); 1725 switch (f->f_type) { 1726 case F_FILE: 1727 printf("%s", f->f_un.f_fname); 1728 break; 1729 1730 case F_CONSOLE: 1731 case F_TTY: 1732 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1733 break; 1734 1735 case F_FORW: 1736 port = (int)ntohs(((struct sockaddr_in *) 1737 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1738 if (port != 514) { 1739 printf("%s:%d", 1740 f->f_un.f_forw.f_hname, port); 1741 } else { 1742 printf("%s", f->f_un.f_forw.f_hname); 1743 } 1744 break; 1745 1746 case F_RING: 1747 printf("%s", f->f_un.f_ring.f_rname); 1748 break; 1749 1750 case F_PIPE: 1751 printf("%s", f->f_un.f_pipe.f_pname); 1752 break; 1753 1754 case F_USERS: 1755 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1756 printf("%s, ", f->f_un.f_uname[i]); 1757 break; 1758 } 1759 if (f->f_program) 1760 printf(" (%s)", f->f_program); 1761 printf("\n"); 1762 } 1763 } 1764 1765 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1766 dprintf("syslogd: restarted\n"); 1767 /* 1768 * Log a change in hostname, but only on a restart. 1769 */ 1770 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1771 snprintf(hostMsg, sizeof(hostMsg), 1772 "syslogd: hostname changed, \"%s\" to \"%s\"", 1773 oldLocalHostName, LocalHostName); 1774 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1775 dprintf("%s\n", hostMsg); 1776 } 1777 /* 1778 * Log the kernel boot file if we aren't going to use it as 1779 * the prefix, and if this is *not* a restart. 1780 */ 1781 if (signo == 0 && !use_bootfile) { 1782 snprintf(bootfileMsg, sizeof(bootfileMsg), 1783 "syslogd: kernel boot file is %s", bootfile); 1784 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1785 dprintf("%s\n", bootfileMsg); 1786 } 1787 } 1788 1789 /* 1790 * Crack a configuration file line 1791 */ 1792 static void 1793 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1794 { 1795 struct addrinfo hints, *res; 1796 int error, i, pri, syncfile; 1797 const char *p, *q; 1798 char *bp; 1799 char buf[MAXLINE], ebuf[100]; 1800 struct stat sb; 1801 1802 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1803 1804 errno = 0; /* keep strerror() stuff out of logerror messages */ 1805 1806 /* clear out file entry */ 1807 memset(f, 0, sizeof(*f)); 1808 for (i = 0; i <= LOG_NFACILITIES; i++) 1809 f->f_pmask[i] = INTERNAL_NOPRI; 1810 1811 /* save hostname if any */ 1812 if (host && *host == '*') 1813 host = NULL; 1814 if (host) { 1815 int hl; 1816 1817 f->f_host = strdup(host); 1818 if (f->f_host == NULL) { 1819 logerror("strdup"); 1820 exit(1); 1821 } 1822 hl = strlen(f->f_host); 1823 if (hl > 0 && f->f_host[hl-1] == '.') 1824 f->f_host[--hl] = '\0'; 1825 trimdomain(f->f_host, hl); 1826 } 1827 1828 /* save program name if any */ 1829 if (prog && *prog == '*') 1830 prog = NULL; 1831 if (prog) { 1832 f->f_program = strdup(prog); 1833 if (f->f_program == NULL) { 1834 logerror("strdup"); 1835 exit(1); 1836 } 1837 } 1838 1839 /* scan through the list of selectors */ 1840 for (p = line; *p && *p != '\t' && *p != ' ';) { 1841 int pri_done; 1842 int pri_cmp; 1843 int pri_invert; 1844 1845 /* find the end of this facility name list */ 1846 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1847 continue; 1848 1849 /* get the priority comparison */ 1850 pri_cmp = 0; 1851 pri_done = 0; 1852 pri_invert = 0; 1853 if (*q == '!') { 1854 pri_invert = 1; 1855 q++; 1856 } 1857 while (!pri_done) { 1858 switch (*q) { 1859 case '<': 1860 pri_cmp |= PRI_LT; 1861 q++; 1862 break; 1863 case '=': 1864 pri_cmp |= PRI_EQ; 1865 q++; 1866 break; 1867 case '>': 1868 pri_cmp |= PRI_GT; 1869 q++; 1870 break; 1871 default: 1872 pri_done++; 1873 break; 1874 } 1875 } 1876 1877 /* collect priority name */ 1878 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1879 *bp++ = *q++; 1880 *bp = '\0'; 1881 1882 /* skip cruft */ 1883 while (strchr(",;", *q)) 1884 q++; 1885 1886 /* decode priority name */ 1887 if (*buf == '*') { 1888 pri = LOG_PRIMASK; 1889 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1890 } else { 1891 /* Ignore trailing spaces. */ 1892 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1893 buf[i] = '\0'; 1894 1895 pri = decode(buf, prioritynames); 1896 if (pri < 0) { 1897 snprintf(ebuf, sizeof ebuf, 1898 "unknown priority name \"%s\"", buf); 1899 logerror(ebuf); 1900 return; 1901 } 1902 } 1903 if (!pri_cmp) 1904 pri_cmp = (UniquePriority) 1905 ? (PRI_EQ) 1906 : (PRI_EQ | PRI_GT) 1907 ; 1908 if (pri_invert) 1909 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1910 1911 /* scan facilities */ 1912 while (*p && !strchr("\t.; ", *p)) { 1913 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1914 *bp++ = *p++; 1915 *bp = '\0'; 1916 1917 if (*buf == '*') { 1918 for (i = 0; i < LOG_NFACILITIES; i++) { 1919 f->f_pmask[i] = pri; 1920 f->f_pcmp[i] = pri_cmp; 1921 } 1922 } else { 1923 i = decode(buf, facilitynames); 1924 if (i < 0) { 1925 snprintf(ebuf, sizeof ebuf, 1926 "unknown facility name \"%s\"", 1927 buf); 1928 logerror(ebuf); 1929 return; 1930 } 1931 f->f_pmask[i >> 3] = pri; 1932 f->f_pcmp[i >> 3] = pri_cmp; 1933 } 1934 while (*p == ',' || *p == ' ') 1935 p++; 1936 } 1937 1938 p = q; 1939 } 1940 1941 /* skip to action part */ 1942 while (*p == '\t' || *p == ' ') 1943 p++; 1944 1945 if (*p == '-') { 1946 syncfile = 0; 1947 p++; 1948 } else 1949 syncfile = 1; 1950 1951 switch (*p) { 1952 case '@': 1953 { 1954 char *tp; 1955 /* 1956 * scan forward to see if there is a port defined. 1957 * so we can't use strlcpy.. 1958 */ 1959 i = sizeof(f->f_un.f_forw.f_hname); 1960 tp = f->f_un.f_forw.f_hname; 1961 p++; 1962 1963 while (*p && (*p != ':') && (i-- > 0)) { 1964 *tp++ = *p++; 1965 } 1966 *tp = '\0'; 1967 } 1968 /* See if we copied a domain and have a port */ 1969 if (*p == ':') 1970 p++; 1971 else 1972 p = NULL; 1973 1974 memset(&hints, 0, sizeof(hints)); 1975 hints.ai_family = family; 1976 hints.ai_socktype = SOCK_DGRAM; 1977 error = getaddrinfo(f->f_un.f_forw.f_hname, 1978 p ? p : "syslog", &hints, &res); 1979 if (error) { 1980 logerror(gai_strerror(error)); 1981 break; 1982 } 1983 f->f_un.f_forw.f_addr = res; 1984 f->f_type = F_FORW; 1985 break; 1986 1987 case '/': 1988 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1989 f->f_type = F_UNUSED; 1990 logerror(p); 1991 break; 1992 } 1993 if (syncfile) 1994 f->f_flags |= FFLAG_SYNC; 1995 if (isatty(f->f_file)) { 1996 if (strcmp(p, ctty) == 0) 1997 f->f_type = F_CONSOLE; 1998 else 1999 f->f_type = F_TTY; 2000 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2001 sizeof(f->f_un.f_fname)); 2002 } else { 2003 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2004 f->f_type = F_FILE; 2005 } 2006 break; 2007 2008 case '%': 2009 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) { 2010 f->f_type = F_UNUSED; 2011 logerror(p + 1); 2012 break; 2013 } 2014 if (fstat(f->f_file,&sb) < 0) { 2015 close(f->f_file); 2016 f->f_type = F_UNUSED; 2017 logerror(p+1); 2018 break; 2019 } 2020 f->f_un.f_ring.f_footer = 2021 mmap(NULL, sizeof(struct clog_footer), 2022 PROT_READ|PROT_WRITE, MAP_SHARED, 2023 f->f_file, sb.st_size-sizeof(struct clog_footer)); 2024 if (f->f_un.f_ring.f_footer == NULL) { 2025 close(f->f_file); 2026 f->f_type = F_UNUSED; 2027 logerror(p + 1); 2028 break; 2029 } 2030 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) { 2031 munmap(f->f_un.f_ring.f_footer, 2032 sizeof(struct clog_footer)); 2033 close(f->f_file); 2034 f->f_type = F_UNUSED; 2035 errno = ENODEV; 2036 logerror(p + 1); 2037 break; 2038 } 2039 f->f_un.f_ring.f_size = sb.st_size; 2040 strcpy(f->f_un.f_ring.f_rname, p + 1); 2041 f->f_type = F_RING; 2042 break; 2043 2044 case '|': 2045 f->f_un.f_pipe.f_pid = 0; 2046 strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2047 sizeof(f->f_un.f_pipe.f_pname)); 2048 f->f_type = F_PIPE; 2049 break; 2050 2051 case '*': 2052 f->f_type = F_WALL; 2053 break; 2054 2055 default: 2056 for (i = 0; i < MAXUNAMES && *p; i++) { 2057 for (q = p; *q && *q != ','; ) 2058 q++; 2059 strncpy(f->f_un.f_uname[i], p, 32); 2060 if ((q - p) > 32) 2061 f->f_un.f_uname[i][32] = '\0'; 2062 else 2063 f->f_un.f_uname[i][q - p] = '\0'; 2064 while (*q == ',' || *q == ' ') 2065 q++; 2066 p = q; 2067 } 2068 f->f_type = F_USERS; 2069 break; 2070 } 2071 } 2072 2073 2074 /* 2075 * Decode a symbolic name to a numeric value 2076 */ 2077 static int 2078 decode(const char *name, CODE *codetab) 2079 { 2080 CODE *c; 2081 char *p, buf[40]; 2082 2083 if (isdigit(*name)) 2084 return (atoi(name)); 2085 2086 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2087 if (isupper(*name)) 2088 *p = tolower(*name); 2089 else 2090 *p = *name; 2091 } 2092 *p = '\0'; 2093 for (c = codetab; c->c_name; c++) 2094 if (!strcmp(buf, c->c_name)) 2095 return (c->c_val); 2096 2097 return (-1); 2098 } 2099 2100 static void 2101 markit(void) 2102 { 2103 struct filed *f; 2104 dq_t q, next; 2105 2106 now = time(NULL); 2107 MarkSeq += TIMERINTVL; 2108 if (MarkSeq >= MarkInterval) { 2109 logmsg(LOG_INFO, "-- MARK --", 2110 LocalHostName, ADDDATE|MARK); 2111 MarkSeq = 0; 2112 } 2113 2114 for (f = Files; f; f = f->f_next) { 2115 if (f->f_prevcount && now >= REPEATTIME(f)) { 2116 dprintf("flush %s: repeated %d times, %d sec.\n", 2117 TypeNames[f->f_type], f->f_prevcount, 2118 repeatinterval[f->f_repeatcount]); 2119 fprintlog(f, 0, NULL); 2120 BACKOFF(f); 2121 } 2122 } 2123 2124 /* Walk the dead queue, and see if we should signal somebody. */ 2125 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2126 next = TAILQ_NEXT(q, dq_entries); 2127 2128 switch (q->dq_timeout) { 2129 case 0: 2130 /* Already signalled once, try harder now. */ 2131 if (kill(q->dq_pid, SIGKILL) != 0) 2132 deadq_remove(q->dq_pid); 2133 break; 2134 2135 case 1: 2136 /* 2137 * Timed out on dead queue, send terminate 2138 * signal. Note that we leave the removal 2139 * from the dead queue to reapchild(), which 2140 * will also log the event (unless the process 2141 * didn't even really exist, in case we simply 2142 * drop it from the dead queue). 2143 */ 2144 if (kill(q->dq_pid, SIGTERM) != 0) 2145 deadq_remove(q->dq_pid); 2146 /* FALLTHROUGH */ 2147 2148 default: 2149 q->dq_timeout--; 2150 } 2151 } 2152 MarkSet = 0; 2153 alarm(TIMERINTVL); 2154 } 2155 2156 /* 2157 * fork off and become a daemon, but wait for the child to come online 2158 * before returing to the parent, or we get disk thrashing at boot etc. 2159 * Set a timer so we don't hang forever if it wedges. 2160 */ 2161 static int 2162 waitdaemon(int nochdir, int noclose, int maxwait) 2163 { 2164 int fd; 2165 int status; 2166 pid_t pid, childpid; 2167 2168 switch (childpid = fork()) { 2169 case -1: 2170 return (-1); 2171 case 0: 2172 break; 2173 default: 2174 signal(SIGALRM, timedout); 2175 alarm(maxwait); 2176 while ((pid = wait3(&status, 0, NULL)) != -1) { 2177 if (WIFEXITED(status)) 2178 errx(1, "child pid %d exited with return code %d", 2179 pid, WEXITSTATUS(status)); 2180 if (WIFSIGNALED(status)) 2181 errx(1, "child pid %d exited on signal %d%s", 2182 pid, WTERMSIG(status), 2183 WCOREDUMP(status) ? " (core dumped)" : 2184 ""); 2185 if (pid == childpid) /* it's gone... */ 2186 break; 2187 } 2188 exit(0); 2189 } 2190 2191 if (setsid() == -1) 2192 return (-1); 2193 2194 if (!nochdir) 2195 chdir("/"); 2196 2197 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2198 dup2(fd, STDIN_FILENO); 2199 dup2(fd, STDOUT_FILENO); 2200 dup2(fd, STDERR_FILENO); 2201 if (fd > 2) 2202 close (fd); 2203 } 2204 return (getppid()); 2205 } 2206 2207 /* 2208 * We get a SIGALRM from the child when it's running and finished doing it's 2209 * fsync()'s or O_SYNC writes for all the boot messages. 2210 * 2211 * We also get a signal from the kernel if the timer expires, so check to 2212 * see what happened. 2213 */ 2214 static void 2215 timedout(int sig __unused) 2216 { 2217 int left; 2218 left = alarm(0); 2219 signal(SIGALRM, SIG_DFL); 2220 if (left == 0) 2221 errx(1, "timed out waiting for child"); 2222 else 2223 _exit(0); 2224 } 2225 2226 /* 2227 * Add `s' to the list of allowable peer addresses to accept messages 2228 * from. 2229 * 2230 * `s' is a string in the form: 2231 * 2232 * [*]domainname[:{servicename|portnumber|*}] 2233 * 2234 * or 2235 * 2236 * netaddr/maskbits[:{servicename|portnumber|*}] 2237 * 2238 * Returns -1 on error, 0 if the argument was valid. 2239 */ 2240 static int 2241 allowaddr(char *s) 2242 { 2243 char *cp1, *cp2; 2244 struct allowedpeer ap; 2245 struct servent *se; 2246 int masklen = -1; 2247 struct addrinfo hints, *res; 2248 struct in_addr *addrp, *maskp; 2249 #ifdef INET6 2250 int i; 2251 u_int32_t *addr6p, *mask6p; 2252 #endif 2253 char ip[NI_MAXHOST]; 2254 2255 #ifdef INET6 2256 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2257 #endif 2258 cp1 = s; 2259 if ((cp1 = strrchr(cp1, ':'))) { 2260 /* service/port provided */ 2261 *cp1++ = '\0'; 2262 if (strlen(cp1) == 1 && *cp1 == '*') 2263 /* any port allowed */ 2264 ap.port = 0; 2265 else if ((se = getservbyname(cp1, "udp"))) { 2266 ap.port = ntohs(se->s_port); 2267 } else { 2268 ap.port = strtol(cp1, &cp2, 0); 2269 if (*cp2 != '\0') 2270 return (-1); /* port not numeric */ 2271 } 2272 } else { 2273 if ((se = getservbyname("syslog", "udp"))) 2274 ap.port = ntohs(se->s_port); 2275 else 2276 /* sanity, should not happen */ 2277 ap.port = 514; 2278 } 2279 2280 if ((cp1 = strchr(s, '/')) != NULL && 2281 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2282 *cp1 = '\0'; 2283 if ((masklen = atoi(cp1 + 1)) < 0) 2284 return (-1); 2285 } 2286 #ifdef INET6 2287 if (*s == '[') { 2288 cp2 = s + strlen(s) - 1; 2289 if (*cp2 == ']') { 2290 ++s; 2291 *cp2 = '\0'; 2292 } else { 2293 cp2 = NULL; 2294 } 2295 } else { 2296 cp2 = NULL; 2297 } 2298 #endif 2299 memset(&hints, 0, sizeof(hints)); 2300 hints.ai_family = PF_UNSPEC; 2301 hints.ai_socktype = SOCK_DGRAM; 2302 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2303 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2304 ap.isnumeric = 1; 2305 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2306 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2307 ap.a_mask.ss_family = res->ai_family; 2308 if (res->ai_family == AF_INET) { 2309 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2310 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2311 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2312 if (masklen < 0) { 2313 /* use default netmask */ 2314 if (IN_CLASSA(ntohl(addrp->s_addr))) 2315 maskp->s_addr = htonl(IN_CLASSA_NET); 2316 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2317 maskp->s_addr = htonl(IN_CLASSB_NET); 2318 else 2319 maskp->s_addr = htonl(IN_CLASSC_NET); 2320 } else if (masklen <= 32) { 2321 /* convert masklen to netmask */ 2322 if (masklen == 0) 2323 maskp->s_addr = 0; 2324 else 2325 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2326 } else { 2327 freeaddrinfo(res); 2328 return (-1); 2329 } 2330 /* Lose any host bits in the network number. */ 2331 addrp->s_addr &= maskp->s_addr; 2332 } 2333 #ifdef INET6 2334 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2335 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2336 if (masklen < 0) 2337 masklen = 128; 2338 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2339 /* convert masklen to netmask */ 2340 while (masklen > 0) { 2341 if (masklen < 32) { 2342 *mask6p = htonl(~(0xffffffff >> masklen)); 2343 break; 2344 } 2345 *mask6p++ = 0xffffffff; 2346 masklen -= 32; 2347 } 2348 /* Lose any host bits in the network number. */ 2349 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2350 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2351 for (i = 0; i < 4; i++) 2352 addr6p[i] &= mask6p[i]; 2353 } 2354 #endif 2355 else { 2356 freeaddrinfo(res); 2357 return (-1); 2358 } 2359 freeaddrinfo(res); 2360 } else { 2361 /* arg `s' is domain name */ 2362 ap.isnumeric = 0; 2363 ap.a_name = s; 2364 if (cp1) 2365 *cp1 = '/'; 2366 #ifdef INET6 2367 if (cp2) { 2368 *cp2 = ']'; 2369 --s; 2370 } 2371 #endif 2372 } 2373 2374 if (Debug) { 2375 printf("allowaddr: rule %d: ", NumAllowed); 2376 if (ap.isnumeric) { 2377 printf("numeric, "); 2378 getnameinfo((struct sockaddr *)&ap.a_addr, 2379 ((struct sockaddr *)&ap.a_addr)->sa_len, 2380 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2381 printf("addr = %s, ", ip); 2382 getnameinfo((struct sockaddr *)&ap.a_mask, 2383 ((struct sockaddr *)&ap.a_mask)->sa_len, 2384 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2385 printf("mask = %s; ", ip); 2386 } else { 2387 printf("domainname = %s; ", ap.a_name); 2388 } 2389 printf("port = %d\n", ap.port); 2390 } 2391 2392 if ((AllowedPeers = realloc(AllowedPeers, 2393 ++NumAllowed * sizeof(struct allowedpeer))) 2394 == NULL) { 2395 logerror("realloc"); 2396 exit(1); 2397 } 2398 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2399 return (0); 2400 } 2401 2402 /* 2403 * Validate that the remote peer has permission to log to us. 2404 */ 2405 static int 2406 validate(struct sockaddr *sa, const char *hname) 2407 { 2408 int i; 2409 size_t l1, l2; 2410 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2411 struct allowedpeer *ap; 2412 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2413 #ifdef INET6 2414 int j, reject; 2415 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2416 #endif 2417 struct addrinfo hints, *res; 2418 u_short sport; 2419 2420 if (NumAllowed == 0) 2421 /* traditional behaviour, allow everything */ 2422 return (1); 2423 2424 strlcpy(name, hname, sizeof(name)); 2425 memset(&hints, 0, sizeof(hints)); 2426 hints.ai_family = PF_UNSPEC; 2427 hints.ai_socktype = SOCK_DGRAM; 2428 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2429 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2430 freeaddrinfo(res); 2431 else if (strchr(name, '.') == NULL) { 2432 strlcat(name, ".", sizeof name); 2433 strlcat(name, LocalDomain, sizeof name); 2434 } 2435 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2436 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2437 return (0); /* for safety, should not occur */ 2438 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2439 ip, port, name); 2440 sport = atoi(port); 2441 2442 /* now, walk down the list */ 2443 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2444 if (ap->port != 0 && ap->port != sport) { 2445 dprintf("rejected in rule %d due to port mismatch.\n", i); 2446 continue; 2447 } 2448 2449 if (ap->isnumeric) { 2450 if (ap->a_addr.ss_family != sa->sa_family) { 2451 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2452 continue; 2453 } 2454 if (ap->a_addr.ss_family == AF_INET) { 2455 sin4 = (struct sockaddr_in *)sa; 2456 a4p = (struct sockaddr_in *)&ap->a_addr; 2457 m4p = (struct sockaddr_in *)&ap->a_mask; 2458 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2459 != a4p->sin_addr.s_addr) { 2460 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2461 continue; 2462 } 2463 } 2464 #ifdef INET6 2465 else if (ap->a_addr.ss_family == AF_INET6) { 2466 sin6 = (struct sockaddr_in6 *)sa; 2467 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2468 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2469 if (a6p->sin6_scope_id != 0 && 2470 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2471 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2472 continue; 2473 } 2474 reject = 0; 2475 for (j = 0; j < 16; j += 4) { 2476 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2477 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2478 ++reject; 2479 break; 2480 } 2481 } 2482 if (reject) { 2483 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2484 continue; 2485 } 2486 } 2487 #endif 2488 else 2489 continue; 2490 } else { 2491 cp = ap->a_name; 2492 l1 = strlen(name); 2493 if (*cp == '*') { 2494 /* allow wildmatch */ 2495 cp++; 2496 l2 = strlen(cp); 2497 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2498 dprintf("rejected in rule %d due to name mismatch.\n", i); 2499 continue; 2500 } 2501 } else { 2502 /* exact match */ 2503 l2 = strlen(cp); 2504 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2505 dprintf("rejected in rule %d due to name mismatch.\n", i); 2506 continue; 2507 } 2508 } 2509 } 2510 dprintf("accepted in rule %d.\n", i); 2511 return (1); /* hooray! */ 2512 } 2513 return (0); 2514 } 2515 2516 /* 2517 * Fairly similar to popen(3), but returns an open descriptor, as 2518 * opposed to a FILE *. 2519 */ 2520 static int 2521 p_open(const char *prog, pid_t *rpid) 2522 { 2523 int pfd[2], nulldesc, i; 2524 pid_t pid; 2525 sigset_t omask, mask; 2526 char *argv[4]; /* sh -c cmd NULL */ 2527 char errmsg[200]; 2528 2529 if (pipe(pfd) == -1) 2530 return (-1); 2531 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2532 /* we are royally screwed anyway */ 2533 return (-1); 2534 2535 sigemptyset(&mask); 2536 sigaddset(&mask, SIGALRM); 2537 sigaddset(&mask, SIGHUP); 2538 sigprocmask(SIG_BLOCK, &mask, &omask); 2539 switch ((pid = fork())) { 2540 case -1: 2541 sigprocmask(SIG_SETMASK, &omask, 0); 2542 close(nulldesc); 2543 return (-1); 2544 2545 case 0: 2546 argv[0] = strdup("sh"); 2547 argv[1] = strdup("-c"); 2548 argv[2] = strdup(prog); 2549 argv[3] = NULL; 2550 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2551 logerror("strdup"); 2552 exit(1); 2553 } 2554 2555 alarm(0); 2556 setsid(); /* Avoid catching SIGHUPs. */ 2557 2558 /* 2559 * Throw away pending signals, and reset signal 2560 * behaviour to standard values. 2561 */ 2562 signal(SIGALRM, SIG_IGN); 2563 signal(SIGHUP, SIG_IGN); 2564 sigprocmask(SIG_SETMASK, &omask, 0); 2565 signal(SIGPIPE, SIG_DFL); 2566 signal(SIGQUIT, SIG_DFL); 2567 signal(SIGALRM, SIG_DFL); 2568 signal(SIGHUP, SIG_DFL); 2569 2570 dup2(pfd[0], STDIN_FILENO); 2571 dup2(nulldesc, STDOUT_FILENO); 2572 dup2(nulldesc, STDERR_FILENO); 2573 for (i = getdtablesize(); i > 2; i--) 2574 close(i); 2575 2576 execvp(_PATH_BSHELL, argv); 2577 _exit(255); 2578 } 2579 2580 sigprocmask(SIG_SETMASK, &omask, 0); 2581 close(nulldesc); 2582 close(pfd[0]); 2583 /* 2584 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2585 * supposed to get an EWOULDBLOCK on writev(2), which is 2586 * caught by the logic above anyway, which will in turn close 2587 * the pipe, and fork a new logging subprocess if necessary. 2588 * The stale subprocess will be killed some time later unless 2589 * it terminated itself due to closing its input pipe (so we 2590 * get rid of really dead puppies). 2591 */ 2592 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2593 /* This is bad. */ 2594 snprintf(errmsg, sizeof errmsg, 2595 "Warning: cannot change pipe to PID %d to " 2596 "non-blocking behaviour.", 2597 (int)pid); 2598 logerror(errmsg); 2599 } 2600 *rpid = pid; 2601 return (pfd[1]); 2602 } 2603 2604 static void 2605 deadq_enter(pid_t pid, const char *name) 2606 { 2607 dq_t p; 2608 int status; 2609 2610 /* 2611 * Be paranoid, if we can't signal the process, don't enter it 2612 * into the dead queue (perhaps it's already dead). If possible, 2613 * we try to fetch and log the child's status. 2614 */ 2615 if (kill(pid, 0) != 0) { 2616 if (waitpid(pid, &status, WNOHANG) > 0) 2617 log_deadchild(pid, status, name); 2618 return; 2619 } 2620 2621 p = malloc(sizeof(struct deadq_entry)); 2622 if (p == NULL) { 2623 logerror("malloc"); 2624 exit(1); 2625 } 2626 2627 p->dq_pid = pid; 2628 p->dq_timeout = DQ_TIMO_INIT; 2629 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2630 } 2631 2632 static int 2633 deadq_remove(pid_t pid) 2634 { 2635 dq_t q; 2636 2637 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2638 if (q->dq_pid == pid) { 2639 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2640 free(q); 2641 return (1); 2642 } 2643 } 2644 2645 return (0); 2646 } 2647 2648 static void 2649 log_deadchild(pid_t pid, int status, const char *name) 2650 { 2651 int code; 2652 char buf[256]; 2653 const char *reason; 2654 2655 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2656 if (WIFSIGNALED(status)) { 2657 reason = "due to signal"; 2658 code = WTERMSIG(status); 2659 } else { 2660 reason = "with status"; 2661 code = WEXITSTATUS(status); 2662 if (code == 0) 2663 return; 2664 } 2665 snprintf(buf, sizeof buf, 2666 "Logging subprocess %d (%s) exited %s %d.", 2667 pid, name, reason, code); 2668 logerror(buf); 2669 } 2670 2671 static int * 2672 socksetup(int af, const char *bindhostname) 2673 { 2674 struct addrinfo hints, *res, *r; 2675 int error, maxs, *s, *socks; 2676 2677 memset(&hints, 0, sizeof(hints)); 2678 hints.ai_flags = AI_PASSIVE; 2679 hints.ai_family = af; 2680 hints.ai_socktype = SOCK_DGRAM; 2681 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2682 if (error) { 2683 logerror(gai_strerror(error)); 2684 errno = 0; 2685 die(0); 2686 } 2687 2688 /* Count max number of sockets we may open */ 2689 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2690 socks = malloc((maxs+1) * sizeof(int)); 2691 if (socks == NULL) { 2692 logerror("couldn't allocate memory for sockets"); 2693 die(0); 2694 } 2695 2696 *socks = 0; /* num of sockets counter at start of array */ 2697 s = socks + 1; 2698 for (r = res; r; r = r->ai_next) { 2699 int on = 1; 2700 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2701 if (*s < 0) { 2702 logerror("socket"); 2703 continue; 2704 } 2705 if (r->ai_family == AF_INET6) { 2706 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2707 (char *)&on, sizeof (on)) < 0) { 2708 logerror("setsockopt"); 2709 close(*s); 2710 continue; 2711 } 2712 } 2713 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2714 (char *)&on, sizeof (on)) < 0) { 2715 logerror("setsockopt"); 2716 close(*s); 2717 continue; 2718 } 2719 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2720 close(*s); 2721 logerror("bind"); 2722 continue; 2723 } 2724 2725 double_rbuf(*s); 2726 2727 (*socks)++; 2728 s++; 2729 } 2730 2731 if (*socks == 0) { 2732 free(socks); 2733 if (Debug) 2734 return (NULL); 2735 else 2736 die(0); 2737 } 2738 if (res) 2739 freeaddrinfo(res); 2740 2741 return (socks); 2742 } 2743 2744 ssize_t 2745 rbwritev(struct filed *f, struct iovec *iov, int iovcnt) 2746 { 2747 int i; 2748 ssize_t out = 0; 2749 ssize_t error; 2750 2751 for (i = 0; i < iovcnt; i++) { 2752 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len); 2753 if (error == -1) 2754 return (-1); 2755 out += error; 2756 } 2757 return (out); 2758 } 2759 2760 2761 ssize_t 2762 rbwrite(struct filed *f, char *buf, size_t nbytes) 2763 { 2764 size_t maxwrite; 2765 ssize_t error; 2766 ssize_t out; 2767 2768 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2769 f->f_un.f_ring.f_footer->cf_next; 2770 out = 0; 2771 2772 f->f_un.f_ring.f_footer->cf_lock = 1; 2773 while (nbytes > 0) { 2774 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2775 f->f_un.f_ring.f_footer->cf_next; 2776 if (maxwrite > nbytes) 2777 maxwrite = nbytes; 2778 error = pwrite(f->f_file, buf, maxwrite, 2779 f->f_un.f_ring.f_footer->cf_next); 2780 if (error == -1) { 2781 f->f_un.f_ring.f_footer->cf_lock = 0; 2782 return (-1); 2783 } 2784 nbytes -= error; 2785 out += error; 2786 buf += error; 2787 f->f_un.f_ring.f_footer->cf_next += error; 2788 if (f->f_un.f_ring.f_footer->cf_next == 2789 f->f_un.f_ring.f_footer->cf_max) { 2790 f->f_un.f_ring.f_footer->cf_next = 0; 2791 f->f_un.f_ring.f_footer->cf_wrap = 1; 2792 } 2793 } 2794 2795 f->f_un.f_ring.f_footer->cf_lock = 0; 2796 return (out); 2797 } 2798 2799 static void 2800 double_rbuf(int fd) 2801 { 2802 socklen_t slen, len; 2803 2804 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2805 len *= 2; 2806 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); 2807 } 2808 } 2809