1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE 120 /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 78 #include <sys/param.h> 79 #include <sys/ioctl.h> 80 #include <sys/stat.h> 81 #include <sys/wait.h> 82 #include <sys/socket.h> 83 #include <sys/queue.h> 84 #include <sys/uio.h> 85 #include <sys/un.h> 86 #include <sys/time.h> 87 #include <sys/resource.h> 88 #include <sys/syslimits.h> 89 #include <sys/types.h> 90 91 #include <netinet/in.h> 92 #include <netdb.h> 93 #include <arpa/inet.h> 94 95 #include <ctype.h> 96 #include <err.h> 97 #include <errno.h> 98 #include <fcntl.h> 99 #include <libutil.h> 100 #include <limits.h> 101 #include <paths.h> 102 #include <signal.h> 103 #include <stdio.h> 104 #include <stdlib.h> 105 #include <string.h> 106 #include <sysexits.h> 107 #include <unistd.h> 108 #include <utmp.h> 109 110 #include "pathnames.h" 111 #include "ttymsg.h" 112 113 #define SYSLOG_NAMES 114 #include <sys/syslog.h> 115 116 const char *ConfFile = _PATH_LOGCONF; 117 const char *PidFile = _PATH_LOGPID; 118 const char ctty[] = _PATH_CONSOLE; 119 120 #define dprintf if (Debug) printf 121 122 #define MAXUNAMES 20 /* maximum number of user names */ 123 124 /* 125 * Unix sockets. 126 * We have two default sockets, one with 666 permissions, 127 * and one for privileged programs. 128 */ 129 struct funix { 130 int s; 131 char *name; 132 mode_t mode; 133 STAILQ_ENTRY(funix) next; 134 }; 135 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 136 { NULL } }; 137 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 138 { &funix_secure } }; 139 140 STAILQ_HEAD(, funix) funixes = { &funix_default, 141 &(funix_secure.next.stqe_next) }; 142 143 /* 144 * Flags to logmsg(). 145 */ 146 147 #define IGN_CONS 0x001 /* don't print on console */ 148 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 149 #define ADDDATE 0x004 /* add a date to the message */ 150 #define MARK 0x008 /* this message is a mark */ 151 #define ISKERNEL 0x010 /* kernel generated message */ 152 153 /* 154 * This structure represents the files that will have log 155 * copies printed. 156 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 157 * or if f_type if F_PIPE and f_pid > 0. 158 */ 159 160 struct filed { 161 struct filed *f_next; /* next in linked list */ 162 short f_type; /* entry type, see below */ 163 short f_file; /* file descriptor */ 164 time_t f_time; /* time this was last written */ 165 char *f_host; /* host from which to recd. */ 166 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 167 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 168 #define PRI_LT 0x1 169 #define PRI_EQ 0x2 170 #define PRI_GT 0x4 171 char *f_program; /* program this applies to */ 172 union { 173 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 174 struct { 175 char f_hname[MAXHOSTNAMELEN]; 176 struct addrinfo *f_addr; 177 178 } f_forw; /* forwarding address */ 179 char f_fname[MAXPATHLEN]; 180 struct { 181 char f_pname[MAXPATHLEN]; 182 pid_t f_pid; 183 } f_pipe; 184 } f_un; 185 char f_prevline[MAXSVLINE]; /* last message logged */ 186 char f_lasttime[16]; /* time of last occurrence */ 187 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 188 int f_prevpri; /* pri of f_prevline */ 189 int f_prevlen; /* length of f_prevline */ 190 int f_prevcount; /* repetition cnt of prevline */ 191 u_int f_repeatcount; /* number of "repeated" msgs */ 192 int f_flags; /* file-specific flags */ 193 #define FFLAG_SYNC 0x01 194 #define FFLAG_NEEDSYNC 0x02 195 }; 196 197 /* 198 * Queue of about-to-be dead processes we should watch out for. 199 */ 200 201 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 202 struct stailhead *deadq_headp; 203 204 struct deadq_entry { 205 pid_t dq_pid; 206 int dq_timeout; 207 TAILQ_ENTRY(deadq_entry) dq_entries; 208 }; 209 210 /* 211 * The timeout to apply to processes waiting on the dead queue. Unit 212 * of measure is `mark intervals', i.e. 20 minutes by default. 213 * Processes on the dead queue will be terminated after that time. 214 */ 215 216 #define DQ_TIMO_INIT 2 217 218 typedef struct deadq_entry *dq_t; 219 220 221 /* 222 * Struct to hold records of network addresses that are allowed to log 223 * to us. 224 */ 225 struct allowedpeer { 226 int isnumeric; 227 u_short port; 228 union { 229 struct { 230 struct sockaddr_storage addr; 231 struct sockaddr_storage mask; 232 } numeric; 233 char *name; 234 } u; 235 #define a_addr u.numeric.addr 236 #define a_mask u.numeric.mask 237 #define a_name u.name 238 }; 239 240 241 /* 242 * Intervals at which we flush out "message repeated" messages, 243 * in seconds after previous message is logged. After each flush, 244 * we move to the next interval until we reach the largest. 245 */ 246 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 247 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 248 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 249 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 250 (f)->f_repeatcount = MAXREPEAT; \ 251 } 252 253 /* values for f_type */ 254 #define F_UNUSED 0 /* unused entry */ 255 #define F_FILE 1 /* regular file */ 256 #define F_TTY 2 /* terminal */ 257 #define F_CONSOLE 3 /* console terminal */ 258 #define F_FORW 4 /* remote machine */ 259 #define F_USERS 5 /* list of users */ 260 #define F_WALL 6 /* everyone logged on */ 261 #define F_PIPE 7 /* pipe to program */ 262 263 const char *TypeNames[8] = { 264 "UNUSED", "FILE", "TTY", "CONSOLE", 265 "FORW", "USERS", "WALL", "PIPE" 266 }; 267 268 static struct filed *Files; /* Log files that we write to */ 269 static struct filed consfile; /* Console */ 270 271 static int Debug; /* debug flag */ 272 static int resolve = 1; /* resolve hostname */ 273 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 274 static const char *LocalDomain; /* our local domain name */ 275 static int *finet; /* Internet datagram socket */ 276 static int fklog = -1; /* /dev/klog */ 277 static int Initialized; /* set when we have initialized ourselves */ 278 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 279 static int MarkSeq; /* mark sequence number */ 280 static int SecureMode; /* when true, receive only unix domain socks */ 281 #ifdef INET6 282 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 283 #else 284 static int family = PF_INET; /* protocol family (IPv4 only) */ 285 #endif 286 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 287 static int use_bootfile; /* log entire bootfile for every kern msg */ 288 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 289 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 290 291 static char bootfile[MAXLINE+1]; /* booted kernel file */ 292 293 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 294 static int NumAllowed; /* Number of entries in AllowedPeers */ 295 296 static int UniquePriority; /* Only log specified priority? */ 297 static int LogFacPri; /* Put facility and priority in log message: */ 298 /* 0=no, 1=numeric, 2=names */ 299 static int KeepKernFac; /* Keep remotely logged kernel facility */ 300 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 301 static struct pidfh *pfh; 302 303 volatile sig_atomic_t MarkSet, WantDie; 304 305 static int allowaddr(char *); 306 static void cfline(const char *, struct filed *, 307 const char *, const char *); 308 static const char *cvthname(struct sockaddr *); 309 static void deadq_enter(pid_t, const char *); 310 static int deadq_remove(pid_t); 311 static int decode(const char *, CODE *); 312 static void die(int); 313 static void dodie(int); 314 static void dofsync(void); 315 static void domark(int); 316 static void fprintlog(struct filed *, int, const char *); 317 static int *socksetup(int, const char *); 318 static void init(int); 319 static void logerror(const char *); 320 static void logmsg(int, const char *, const char *, int); 321 static void log_deadchild(pid_t, int, const char *); 322 static void markit(void); 323 static int skip_message(const char *, const char *, int); 324 static void printline(const char *, char *); 325 static void printsys(char *); 326 static int p_open(const char *, pid_t *); 327 static void readklog(void); 328 static void reapchild(int); 329 static void usage(void); 330 static int validate(struct sockaddr *, const char *); 331 static void unmapped(struct sockaddr *); 332 static void wallmsg(struct filed *, struct iovec *); 333 static int waitdaemon(int, int, int); 334 static void timedout(int); 335 static void double_rbuf(int); 336 337 int 338 main(int argc, char *argv[]) 339 { 340 int ch, i, fdsrmax = 0, l; 341 struct sockaddr_un sunx, fromunix; 342 struct sockaddr_storage frominet; 343 fd_set *fdsr = NULL; 344 char line[MAXLINE + 1]; 345 const char *bindhostname, *hname; 346 struct timeval tv, *tvp; 347 struct sigaction sact; 348 struct funix *fx, *fx1; 349 sigset_t mask; 350 pid_t ppid = 1, spid; 351 socklen_t len; 352 353 bindhostname = NULL; 354 while ((ch = getopt(argc, argv, "46Aa:b:cCdf:kl:m:nop:P:sS:uv")) != -1) 355 switch (ch) { 356 case '4': 357 family = PF_INET; 358 break; 359 #ifdef INET6 360 case '6': 361 family = PF_INET6; 362 break; 363 #endif 364 case 'A': 365 send_to_all++; 366 break; 367 case 'a': /* allow specific network addresses only */ 368 if (allowaddr(optarg) == -1) 369 usage(); 370 break; 371 case 'b': 372 bindhostname = optarg; 373 break; 374 case 'c': 375 no_compress++; 376 break; 377 case 'C': 378 logflags |= O_CREAT; 379 break; 380 case 'd': /* debug */ 381 Debug++; 382 break; 383 case 'f': /* configuration file */ 384 ConfFile = optarg; 385 break; 386 case 'k': /* keep remote kern fac */ 387 KeepKernFac = 1; 388 break; 389 case 'l': 390 { 391 long perml; 392 mode_t mode; 393 char *name, *ep; 394 395 if (optarg[0] == '/') { 396 mode = DEFFILEMODE; 397 name = optarg; 398 } else if ((name = strchr(optarg, ':')) != NULL) { 399 *name++ = '\0'; 400 if (name[0] != '/') 401 errx(1, "socket name must be absolute " 402 "path"); 403 if (isdigit(*optarg)) { 404 perml = strtol(optarg, &ep, 8); 405 if (*ep || perml < 0 || 406 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 407 errx(1, "invalid mode %s, exiting", 408 optarg); 409 mode = (mode_t )perml; 410 } else 411 errx(1, "invalid mode %s, exiting", 412 optarg); 413 } else /* doesn't begin with '/', and no ':' */ 414 errx(1, "can't parse path %s", optarg); 415 416 if (strlen(name) >= sizeof(sunx.sun_path)) 417 errx(1, "%s path too long, exiting", name); 418 if ((fx = malloc(sizeof(struct funix))) == NULL) 419 errx(1, "malloc failed"); 420 fx->s = -1; 421 fx->name = name; 422 fx->mode = mode; 423 STAILQ_INSERT_TAIL(&funixes, fx, next); 424 break; 425 } 426 case 'm': /* mark interval */ 427 MarkInterval = atoi(optarg) * 60; 428 break; 429 case 'n': 430 resolve = 0; 431 break; 432 case 'o': 433 use_bootfile = 1; 434 break; 435 case 'p': /* path */ 436 if (strlen(optarg) >= sizeof(sunx.sun_path)) 437 errx(1, "%s path too long, exiting", optarg); 438 funix_default.name = optarg; 439 break; 440 case 'P': /* path for alt. PID */ 441 PidFile = optarg; 442 break; 443 case 's': /* no network mode */ 444 SecureMode++; 445 break; 446 case 'S': /* path for privileged originator */ 447 if (strlen(optarg) >= sizeof(sunx.sun_path)) 448 errx(1, "%s path too long, exiting", optarg); 449 funix_secure.name = optarg; 450 break; 451 case 'u': /* only log specified priority */ 452 UniquePriority++; 453 break; 454 case 'v': /* log facility and priority */ 455 LogFacPri++; 456 break; 457 default: 458 usage(); 459 } 460 if ((argc -= optind) != 0) 461 usage(); 462 463 pfh = pidfile_open(PidFile, 0600, &spid); 464 if (pfh == NULL) { 465 if (errno == EEXIST) 466 errx(1, "syslogd already running, pid: %d", spid); 467 warn("cannot open pid file"); 468 } 469 470 if (!Debug) { 471 ppid = waitdaemon(0, 0, 30); 472 if (ppid < 0) { 473 warn("could not become daemon"); 474 pidfile_remove(pfh); 475 exit(1); 476 } 477 } else { 478 setlinebuf(stdout); 479 } 480 481 if (NumAllowed) 482 endservent(); 483 484 consfile.f_type = F_CONSOLE; 485 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 486 sizeof(consfile.f_un.f_fname)); 487 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 488 (void)signal(SIGTERM, dodie); 489 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 490 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 491 /* 492 * We don't want the SIGCHLD and SIGHUP handlers to interfere 493 * with each other; they are likely candidates for being called 494 * simultaneously (SIGHUP closes pipe descriptor, process dies, 495 * SIGCHLD happens). 496 */ 497 sigemptyset(&mask); 498 sigaddset(&mask, SIGHUP); 499 sact.sa_handler = reapchild; 500 sact.sa_mask = mask; 501 sact.sa_flags = SA_RESTART; 502 (void)sigaction(SIGCHLD, &sact, NULL); 503 (void)signal(SIGALRM, domark); 504 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 505 (void)alarm(TIMERINTVL); 506 507 TAILQ_INIT(&deadq_head); 508 509 #ifndef SUN_LEN 510 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 511 #endif 512 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 513 (void)unlink(fx->name); 514 memset(&sunx, 0, sizeof(sunx)); 515 sunx.sun_family = AF_LOCAL; 516 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 517 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 518 if (fx->s < 0 || 519 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 520 chmod(fx->name, fx->mode) < 0) { 521 (void)snprintf(line, sizeof line, 522 "cannot create %s", fx->name); 523 logerror(line); 524 dprintf("cannot create %s (%d)\n", fx->name, errno); 525 if (fx == &funix_default || fx == &funix_secure) 526 die(0); 527 else { 528 STAILQ_REMOVE(&funixes, fx, funix, next); 529 continue; 530 } 531 double_rbuf(fx->s); 532 } 533 } 534 if (SecureMode <= 1) 535 finet = socksetup(family, bindhostname); 536 537 if (finet) { 538 if (SecureMode) { 539 for (i = 0; i < *finet; i++) { 540 if (shutdown(finet[i+1], SHUT_RD) < 0) { 541 logerror("shutdown"); 542 if (!Debug) 543 die(0); 544 } 545 } 546 } else { 547 dprintf("listening on inet and/or inet6 socket\n"); 548 } 549 dprintf("sending on inet and/or inet6 socket\n"); 550 } 551 552 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 553 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 554 fklog = -1; 555 if (fklog < 0) 556 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 557 558 /* tuck my process id away */ 559 pidfile_write(pfh); 560 561 dprintf("off & running....\n"); 562 563 init(0); 564 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 565 sigemptyset(&mask); 566 sigaddset(&mask, SIGCHLD); 567 sact.sa_handler = init; 568 sact.sa_mask = mask; 569 sact.sa_flags = SA_RESTART; 570 (void)sigaction(SIGHUP, &sact, NULL); 571 572 tvp = &tv; 573 tv.tv_sec = tv.tv_usec = 0; 574 575 if (fklog != -1 && fklog > fdsrmax) 576 fdsrmax = fklog; 577 if (finet && !SecureMode) { 578 for (i = 0; i < *finet; i++) { 579 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 580 fdsrmax = finet[i+1]; 581 } 582 } 583 STAILQ_FOREACH(fx, &funixes, next) 584 if (fx->s > fdsrmax) 585 fdsrmax = fx->s; 586 587 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 588 sizeof(fd_mask)); 589 if (fdsr == NULL) 590 errx(1, "calloc fd_set"); 591 592 for (;;) { 593 if (MarkSet) 594 markit(); 595 if (WantDie) 596 die(WantDie); 597 598 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 599 sizeof(fd_mask)); 600 601 if (fklog != -1) 602 FD_SET(fklog, fdsr); 603 if (finet && !SecureMode) { 604 for (i = 0; i < *finet; i++) { 605 if (finet[i+1] != -1) 606 FD_SET(finet[i+1], fdsr); 607 } 608 } 609 STAILQ_FOREACH(fx, &funixes, next) 610 FD_SET(fx->s, fdsr); 611 612 i = select(fdsrmax+1, fdsr, NULL, NULL, 613 needdofsync ? &tv : tvp); 614 switch (i) { 615 case 0: 616 dofsync(); 617 needdofsync = 0; 618 if (tvp) { 619 tvp = NULL; 620 if (ppid != 1) 621 kill(ppid, SIGALRM); 622 } 623 continue; 624 case -1: 625 if (errno != EINTR) 626 logerror("select"); 627 continue; 628 } 629 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 630 readklog(); 631 if (finet && !SecureMode) { 632 for (i = 0; i < *finet; i++) { 633 if (FD_ISSET(finet[i+1], fdsr)) { 634 len = sizeof(frominet); 635 l = recvfrom(finet[i+1], line, MAXLINE, 636 0, (struct sockaddr *)&frominet, 637 &len); 638 if (l > 0) { 639 line[l] = '\0'; 640 hname = cvthname((struct sockaddr *)&frominet); 641 unmapped((struct sockaddr *)&frominet); 642 if (validate((struct sockaddr *)&frominet, hname)) 643 printline(hname, line); 644 } else if (l < 0 && errno != EINTR) 645 logerror("recvfrom inet"); 646 } 647 } 648 } 649 STAILQ_FOREACH(fx, &funixes, next) { 650 if (FD_ISSET(fx->s, fdsr)) { 651 len = sizeof(fromunix); 652 l = recvfrom(fx->s, line, MAXLINE, 0, 653 (struct sockaddr *)&fromunix, &len); 654 if (l > 0) { 655 line[l] = '\0'; 656 printline(LocalHostName, line); 657 } else if (l < 0 && errno != EINTR) 658 logerror("recvfrom unix"); 659 } 660 } 661 } 662 if (fdsr) 663 free(fdsr); 664 } 665 666 static void 667 unmapped(struct sockaddr *sa) 668 { 669 struct sockaddr_in6 *sin6; 670 struct sockaddr_in sin4; 671 672 if (sa->sa_family != AF_INET6) 673 return; 674 if (sa->sa_len != sizeof(struct sockaddr_in6) || 675 sizeof(sin4) > sa->sa_len) 676 return; 677 sin6 = (struct sockaddr_in6 *)sa; 678 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 679 return; 680 681 memset(&sin4, 0, sizeof(sin4)); 682 sin4.sin_family = AF_INET; 683 sin4.sin_len = sizeof(struct sockaddr_in); 684 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 685 sizeof(sin4.sin_addr)); 686 sin4.sin_port = sin6->sin6_port; 687 688 memcpy(sa, &sin4, sin4.sin_len); 689 } 690 691 static void 692 usage(void) 693 { 694 695 fprintf(stderr, "%s\n%s\n%s\n%s\n", 696 "usage: syslogd [-46ACcdknosuv] [-a allowed_peer]", 697 " [-b bind_address] [-f config_file]", 698 " [-l [mode:]path] [-m mark_interval]", 699 " [-P pid_file] [-p log_socket]"); 700 exit(1); 701 } 702 703 /* 704 * Take a raw input line, decode the message, and print the message 705 * on the appropriate log files. 706 */ 707 static void 708 printline(const char *hname, char *msg) 709 { 710 char *p, *q; 711 long n; 712 int c, pri; 713 char line[MAXLINE + 1]; 714 715 /* test for special codes */ 716 p = msg; 717 pri = DEFUPRI; 718 if (*p == '<') { 719 errno = 0; 720 n = strtol(p + 1, &q, 10); 721 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 722 p = q + 1; 723 pri = n; 724 } 725 } 726 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 727 pri = DEFUPRI; 728 729 /* 730 * Don't allow users to log kernel messages. 731 * NOTE: since LOG_KERN == 0 this will also match 732 * messages with no facility specified. 733 */ 734 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 735 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 736 737 q = line; 738 739 while ((c = (unsigned char)*p++) != '\0' && 740 q < &line[sizeof(line) - 4]) { 741 if ((c & 0x80) && c < 0xA0) { 742 c &= 0x7F; 743 *q++ = 'M'; 744 *q++ = '-'; 745 } 746 if (isascii(c) && iscntrl(c)) { 747 if (c == '\n') { 748 *q++ = ' '; 749 } else if (c == '\t') { 750 *q++ = '\t'; 751 } else { 752 *q++ = '^'; 753 *q++ = c ^ 0100; 754 } 755 } else { 756 *q++ = c; 757 } 758 } 759 *q = '\0'; 760 761 logmsg(pri, line, hname, 0); 762 } 763 764 /* 765 * Read /dev/klog while data are available, split into lines. 766 */ 767 static void 768 readklog(void) 769 { 770 char *p, *q, line[MAXLINE + 1]; 771 int len, i; 772 773 len = 0; 774 for (;;) { 775 i = read(fklog, line + len, MAXLINE - 1 - len); 776 if (i > 0) { 777 line[i + len] = '\0'; 778 } else { 779 if (i < 0 && errno != EINTR && errno != EAGAIN) { 780 logerror("klog"); 781 fklog = -1; 782 } 783 break; 784 } 785 786 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 787 *q = '\0'; 788 printsys(p); 789 } 790 len = strlen(p); 791 if (len >= MAXLINE - 1) { 792 printsys(p); 793 len = 0; 794 } 795 if (len > 0) 796 memmove(line, p, len + 1); 797 } 798 if (len > 0) 799 printsys(line); 800 } 801 802 /* 803 * Take a raw input line from /dev/klog, format similar to syslog(). 804 */ 805 static void 806 printsys(char *msg) 807 { 808 char *p, *q; 809 long n; 810 int flags, isprintf, pri; 811 812 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 813 p = msg; 814 pri = DEFSPRI; 815 isprintf = 1; 816 if (*p == '<') { 817 errno = 0; 818 n = strtol(p + 1, &q, 10); 819 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 820 p = q + 1; 821 pri = n; 822 isprintf = 0; 823 } 824 } 825 /* 826 * Kernel printf's and LOG_CONSOLE messages have been displayed 827 * on the console already. 828 */ 829 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 830 flags |= IGN_CONS; 831 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 832 pri = DEFSPRI; 833 logmsg(pri, p, LocalHostName, flags); 834 } 835 836 static time_t now; 837 838 /* 839 * Match a program or host name against a specification. 840 * Return a non-0 value if the message must be ignored 841 * based on the specification. 842 */ 843 static int 844 skip_message(const char *name, const char *spec, int checkcase) 845 { 846 const char *s; 847 char prev, next; 848 int exclude = 0; 849 /* Behaviour on explicit match */ 850 851 if (spec == NULL) 852 return 0; 853 switch (*spec) { 854 case '-': 855 exclude = 1; 856 /*FALLTHROUGH*/ 857 case '+': 858 spec++; 859 break; 860 default: 861 break; 862 } 863 if (checkcase) 864 s = strstr (spec, name); 865 else 866 s = strcasestr (spec, name); 867 868 if (s != NULL) { 869 prev = (s == spec ? ',' : *(s - 1)); 870 next = *(s + strlen (name)); 871 872 if (prev == ',' && (next == '\0' || next == ',')) 873 /* Explicit match: skip iff the spec is an 874 exclusive one. */ 875 return exclude; 876 } 877 878 /* No explicit match for this name: skip the message iff 879 the spec is an inclusive one. */ 880 return !exclude; 881 } 882 883 /* 884 * Log a message to the appropriate log files, users, etc. based on 885 * the priority. 886 */ 887 static void 888 logmsg(int pri, const char *msg, const char *from, int flags) 889 { 890 struct filed *f; 891 int i, fac, msglen, omask, prilev; 892 const char *timestamp; 893 char prog[NAME_MAX+1]; 894 char buf[MAXLINE+1]; 895 896 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 897 pri, flags, from, msg); 898 899 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 900 901 /* 902 * Check to see if msg looks non-standard. 903 */ 904 msglen = strlen(msg); 905 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 906 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 907 flags |= ADDDATE; 908 909 (void)time(&now); 910 if (flags & ADDDATE) { 911 timestamp = ctime(&now) + 4; 912 } else { 913 timestamp = msg; 914 msg += 16; 915 msglen -= 16; 916 } 917 918 /* skip leading blanks */ 919 while (isspace(*msg)) { 920 msg++; 921 msglen--; 922 } 923 924 /* extract facility and priority level */ 925 if (flags & MARK) 926 fac = LOG_NFACILITIES; 927 else 928 fac = LOG_FAC(pri); 929 930 /* Check maximum facility number. */ 931 if (fac > LOG_NFACILITIES) { 932 (void)sigsetmask(omask); 933 return; 934 } 935 936 prilev = LOG_PRI(pri); 937 938 /* extract program name */ 939 for (i = 0; i < NAME_MAX; i++) { 940 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 941 msg[i] == '/' || isspace(msg[i])) 942 break; 943 prog[i] = msg[i]; 944 } 945 prog[i] = 0; 946 947 /* add kernel prefix for kernel messages */ 948 if (flags & ISKERNEL) { 949 snprintf(buf, sizeof(buf), "%s: %s", 950 use_bootfile ? bootfile : "kernel", msg); 951 msg = buf; 952 msglen = strlen(buf); 953 } 954 955 /* log the message to the particular outputs */ 956 if (!Initialized) { 957 f = &consfile; 958 /* 959 * Open in non-blocking mode to avoid hangs during open 960 * and close(waiting for the port to drain). 961 */ 962 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 963 964 if (f->f_file >= 0) { 965 (void)strlcpy(f->f_lasttime, timestamp, 966 sizeof(f->f_lasttime)); 967 fprintlog(f, flags, msg); 968 (void)close(f->f_file); 969 } 970 (void)sigsetmask(omask); 971 return; 972 } 973 for (f = Files; f; f = f->f_next) { 974 /* skip messages that are incorrect priority */ 975 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 976 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 977 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 978 ) 979 || f->f_pmask[fac] == INTERNAL_NOPRI) 980 continue; 981 982 /* skip messages with the incorrect hostname */ 983 if (skip_message(from, f->f_host, 0)) 984 continue; 985 986 /* skip messages with the incorrect program name */ 987 if (skip_message(prog, f->f_program, 1)) 988 continue; 989 990 /* skip message to console if it has already been printed */ 991 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 992 continue; 993 994 /* don't output marks to recently written files */ 995 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 996 continue; 997 998 /* 999 * suppress duplicate lines to this file 1000 */ 1001 if (no_compress - (f->f_type != F_PIPE) < 1 && 1002 (flags & MARK) == 0 && msglen == f->f_prevlen && 1003 f->f_prevline && !strcmp(msg, f->f_prevline) && 1004 !strcasecmp(from, f->f_prevhost)) { 1005 (void)strlcpy(f->f_lasttime, timestamp, 1006 sizeof(f->f_lasttime)); 1007 f->f_prevcount++; 1008 dprintf("msg repeated %d times, %ld sec of %d\n", 1009 f->f_prevcount, (long)(now - f->f_time), 1010 repeatinterval[f->f_repeatcount]); 1011 /* 1012 * If domark would have logged this by now, 1013 * flush it now (so we don't hold isolated messages), 1014 * but back off so we'll flush less often 1015 * in the future. 1016 */ 1017 if (now > REPEATTIME(f)) { 1018 fprintlog(f, flags, (char *)NULL); 1019 BACKOFF(f); 1020 } 1021 } else { 1022 /* new line, save it */ 1023 if (f->f_prevcount) 1024 fprintlog(f, 0, (char *)NULL); 1025 f->f_repeatcount = 0; 1026 f->f_prevpri = pri; 1027 (void)strlcpy(f->f_lasttime, timestamp, 1028 sizeof(f->f_lasttime)); 1029 (void)strlcpy(f->f_prevhost, from, 1030 sizeof(f->f_prevhost)); 1031 if (msglen < MAXSVLINE) { 1032 f->f_prevlen = msglen; 1033 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1034 fprintlog(f, flags, (char *)NULL); 1035 } else { 1036 f->f_prevline[0] = 0; 1037 f->f_prevlen = 0; 1038 fprintlog(f, flags, msg); 1039 } 1040 } 1041 } 1042 (void)sigsetmask(omask); 1043 } 1044 1045 static void 1046 dofsync(void) 1047 { 1048 struct filed *f; 1049 1050 for (f = Files; f; f = f->f_next) { 1051 if ((f->f_type == F_FILE) && 1052 (f->f_flags & FFLAG_NEEDSYNC)) { 1053 f->f_flags &= ~FFLAG_NEEDSYNC; 1054 (void)fsync(f->f_file); 1055 } 1056 } 1057 } 1058 1059 static void 1060 fprintlog(struct filed *f, int flags, const char *msg) 1061 { 1062 struct iovec iov[7]; 1063 struct iovec *v; 1064 struct addrinfo *r; 1065 int i, l, lsent = 0; 1066 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1067 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1068 const char *msgret; 1069 1070 v = iov; 1071 if (f->f_type == F_WALL) { 1072 v->iov_base = greetings; 1073 /* The time displayed is not synchornized with the other log 1074 * destinations (like messages). Following fragment was using 1075 * ctime(&now), which was updating the time every 30 sec. 1076 * With f_lasttime, time is synchronized correctly. 1077 */ 1078 v->iov_len = snprintf(greetings, sizeof greetings, 1079 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1080 f->f_prevhost, f->f_lasttime); 1081 if (v->iov_len > 0) 1082 v++; 1083 v->iov_base = nul; 1084 v->iov_len = 0; 1085 v++; 1086 } else { 1087 v->iov_base = f->f_lasttime; 1088 v->iov_len = strlen(f->f_lasttime); 1089 v++; 1090 v->iov_base = space; 1091 v->iov_len = 1; 1092 v++; 1093 } 1094 1095 if (LogFacPri) { 1096 static char fp_buf[30]; /* Hollow laugh */ 1097 int fac = f->f_prevpri & LOG_FACMASK; 1098 int pri = LOG_PRI(f->f_prevpri); 1099 const char *f_s = NULL; 1100 char f_n[5]; /* Hollow laugh */ 1101 const char *p_s = NULL; 1102 char p_n[5]; /* Hollow laugh */ 1103 1104 if (LogFacPri > 1) { 1105 CODE *c; 1106 1107 for (c = facilitynames; c->c_name; c++) { 1108 if (c->c_val == fac) { 1109 f_s = c->c_name; 1110 break; 1111 } 1112 } 1113 for (c = prioritynames; c->c_name; c++) { 1114 if (c->c_val == pri) { 1115 p_s = c->c_name; 1116 break; 1117 } 1118 } 1119 } 1120 if (!f_s) { 1121 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1122 f_s = f_n; 1123 } 1124 if (!p_s) { 1125 snprintf(p_n, sizeof p_n, "%d", pri); 1126 p_s = p_n; 1127 } 1128 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1129 v->iov_base = fp_buf; 1130 v->iov_len = strlen(fp_buf); 1131 } else { 1132 v->iov_base = nul; 1133 v->iov_len = 0; 1134 } 1135 v++; 1136 1137 v->iov_base = f->f_prevhost; 1138 v->iov_len = strlen(v->iov_base); 1139 v++; 1140 v->iov_base = space; 1141 v->iov_len = 1; 1142 v++; 1143 1144 if (msg) { 1145 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1146 if (wmsg == NULL) { 1147 logerror("strdup"); 1148 exit(1); 1149 } 1150 v->iov_base = wmsg; 1151 v->iov_len = strlen(msg); 1152 } else if (f->f_prevcount > 1) { 1153 v->iov_base = repbuf; 1154 v->iov_len = snprintf(repbuf, sizeof repbuf, 1155 "last message repeated %d times", f->f_prevcount); 1156 } else if (f->f_prevline) { 1157 v->iov_base = f->f_prevline; 1158 v->iov_len = f->f_prevlen; 1159 } else { 1160 return; 1161 } 1162 v++; 1163 1164 dprintf("Logging to %s", TypeNames[f->f_type]); 1165 f->f_time = now; 1166 1167 switch (f->f_type) { 1168 int port; 1169 case F_UNUSED: 1170 dprintf("\n"); 1171 break; 1172 1173 case F_FORW: 1174 port = (int)ntohs(((struct sockaddr_in *) 1175 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1176 if (port != 514) { 1177 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1178 } else { 1179 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1180 } 1181 /* check for local vs remote messages */ 1182 if (strcasecmp(f->f_prevhost, LocalHostName)) 1183 l = snprintf(line, sizeof line - 1, 1184 "<%d>%.15s Forwarded from %s: %s", 1185 f->f_prevpri, (char *)iov[0].iov_base, 1186 f->f_prevhost, (char *)iov[5].iov_base); 1187 else 1188 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1189 f->f_prevpri, (char *)iov[0].iov_base, 1190 (char *)iov[5].iov_base); 1191 if (l < 0) 1192 l = 0; 1193 else if (l > MAXLINE) 1194 l = MAXLINE; 1195 1196 if (finet) { 1197 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1198 for (i = 0; i < *finet; i++) { 1199 #if 0 1200 /* 1201 * should we check AF first, or just 1202 * trial and error? FWD 1203 */ 1204 if (r->ai_family == 1205 address_family_of(finet[i+1])) 1206 #endif 1207 lsent = sendto(finet[i+1], line, l, 0, 1208 r->ai_addr, r->ai_addrlen); 1209 if (lsent == l) 1210 break; 1211 } 1212 if (lsent == l && !send_to_all) 1213 break; 1214 } 1215 dprintf("lsent/l: %d/%d\n", lsent, l); 1216 if (lsent != l) { 1217 int e = errno; 1218 logerror("sendto"); 1219 errno = e; 1220 switch (errno) { 1221 case ENOBUFS: 1222 case ENETDOWN: 1223 case EHOSTUNREACH: 1224 case EHOSTDOWN: 1225 break; 1226 /* case EBADF: */ 1227 /* case EACCES: */ 1228 /* case ENOTSOCK: */ 1229 /* case EFAULT: */ 1230 /* case EMSGSIZE: */ 1231 /* case EAGAIN: */ 1232 /* case ENOBUFS: */ 1233 /* case ECONNREFUSED: */ 1234 default: 1235 dprintf("removing entry\n"); 1236 f->f_type = F_UNUSED; 1237 break; 1238 } 1239 } 1240 } 1241 break; 1242 1243 case F_FILE: 1244 dprintf(" %s\n", f->f_un.f_fname); 1245 v->iov_base = lf; 1246 v->iov_len = 1; 1247 if (writev(f->f_file, iov, 7) < 0) { 1248 /* 1249 * If writev(2) fails for potentially transient errors 1250 * like the filesystem being full, ignore it. 1251 * Otherwise remove this logfile from the list. 1252 */ 1253 if (errno != ENOSPC) { 1254 int e = errno; 1255 (void)close(f->f_file); 1256 f->f_type = F_UNUSED; 1257 errno = e; 1258 logerror(f->f_un.f_fname); 1259 } 1260 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1261 f->f_flags |= FFLAG_NEEDSYNC; 1262 needdofsync = 1; 1263 } 1264 break; 1265 1266 case F_PIPE: 1267 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1268 v->iov_base = lf; 1269 v->iov_len = 1; 1270 if (f->f_un.f_pipe.f_pid == 0) { 1271 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1272 &f->f_un.f_pipe.f_pid)) < 0) { 1273 f->f_type = F_UNUSED; 1274 logerror(f->f_un.f_pipe.f_pname); 1275 break; 1276 } 1277 } 1278 if (writev(f->f_file, iov, 7) < 0) { 1279 int e = errno; 1280 (void)close(f->f_file); 1281 if (f->f_un.f_pipe.f_pid > 0) 1282 deadq_enter(f->f_un.f_pipe.f_pid, 1283 f->f_un.f_pipe.f_pname); 1284 f->f_un.f_pipe.f_pid = 0; 1285 errno = e; 1286 logerror(f->f_un.f_pipe.f_pname); 1287 } 1288 break; 1289 1290 case F_CONSOLE: 1291 if (flags & IGN_CONS) { 1292 dprintf(" (ignored)\n"); 1293 break; 1294 } 1295 /* FALLTHROUGH */ 1296 1297 case F_TTY: 1298 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1299 v->iov_base = crlf; 1300 v->iov_len = 2; 1301 1302 errno = 0; /* ttymsg() only sometimes returns an errno */ 1303 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1304 f->f_type = F_UNUSED; 1305 logerror(msgret); 1306 } 1307 break; 1308 1309 case F_USERS: 1310 case F_WALL: 1311 dprintf("\n"); 1312 v->iov_base = crlf; 1313 v->iov_len = 2; 1314 wallmsg(f, iov); 1315 break; 1316 } 1317 f->f_prevcount = 0; 1318 if (wmsg) 1319 free(wmsg); 1320 } 1321 1322 /* 1323 * WALLMSG -- Write a message to the world at large 1324 * 1325 * Write the specified message to either the entire 1326 * world, or a list of approved users. 1327 */ 1328 static void 1329 wallmsg(struct filed *f, struct iovec *iov) 1330 { 1331 static int reenter; /* avoid calling ourselves */ 1332 FILE *uf; 1333 struct utmp ut; 1334 int i; 1335 const char *p; 1336 char line[sizeof(ut.ut_line) + 1]; 1337 1338 if (reenter++) 1339 return; 1340 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1341 logerror(_PATH_UTMP); 1342 reenter = 0; 1343 return; 1344 } 1345 /* NOSTRICT */ 1346 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1347 if (ut.ut_name[0] == '\0') 1348 continue; 1349 /* We must use strncpy since ut_* may not be NUL terminated. */ 1350 strncpy(line, ut.ut_line, sizeof(line) - 1); 1351 line[sizeof(line) - 1] = '\0'; 1352 if (f->f_type == F_WALL) { 1353 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1354 errno = 0; /* already in msg */ 1355 logerror(p); 1356 } 1357 continue; 1358 } 1359 /* should we send the message to this user? */ 1360 for (i = 0; i < MAXUNAMES; i++) { 1361 if (!f->f_un.f_uname[i][0]) 1362 break; 1363 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1364 UT_NAMESIZE)) { 1365 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1366 != NULL) { 1367 errno = 0; /* already in msg */ 1368 logerror(p); 1369 } 1370 break; 1371 } 1372 } 1373 } 1374 (void)fclose(uf); 1375 reenter = 0; 1376 } 1377 1378 static void 1379 reapchild(int signo __unused) 1380 { 1381 int status; 1382 pid_t pid; 1383 struct filed *f; 1384 1385 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1386 if (!Initialized) 1387 /* Don't tell while we are initting. */ 1388 continue; 1389 1390 /* First, look if it's a process from the dead queue. */ 1391 if (deadq_remove(pid)) 1392 goto oncemore; 1393 1394 /* Now, look in list of active processes. */ 1395 for (f = Files; f; f = f->f_next) 1396 if (f->f_type == F_PIPE && 1397 f->f_un.f_pipe.f_pid == pid) { 1398 (void)close(f->f_file); 1399 f->f_un.f_pipe.f_pid = 0; 1400 log_deadchild(pid, status, 1401 f->f_un.f_pipe.f_pname); 1402 break; 1403 } 1404 oncemore: 1405 continue; 1406 } 1407 } 1408 1409 /* 1410 * Return a printable representation of a host address. 1411 */ 1412 static const char * 1413 cvthname(struct sockaddr *f) 1414 { 1415 int error, hl; 1416 sigset_t omask, nmask; 1417 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1418 1419 error = getnameinfo((struct sockaddr *)f, 1420 ((struct sockaddr *)f)->sa_len, 1421 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1422 dprintf("cvthname(%s)\n", ip); 1423 1424 if (error) { 1425 dprintf("Malformed from address %s\n", gai_strerror(error)); 1426 return ("???"); 1427 } 1428 if (!resolve) 1429 return (ip); 1430 1431 sigemptyset(&nmask); 1432 sigaddset(&nmask, SIGHUP); 1433 sigprocmask(SIG_BLOCK, &nmask, &omask); 1434 error = getnameinfo((struct sockaddr *)f, 1435 ((struct sockaddr *)f)->sa_len, 1436 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1437 sigprocmask(SIG_SETMASK, &omask, NULL); 1438 if (error) { 1439 dprintf("Host name for your address (%s) unknown\n", ip); 1440 return (ip); 1441 } 1442 hl = strlen(hname); 1443 if (hl > 0 && hname[hl-1] == '.') 1444 hname[--hl] = '\0'; 1445 trimdomain(hname, hl); 1446 return (hname); 1447 } 1448 1449 static void 1450 dodie(int signo) 1451 { 1452 1453 WantDie = signo; 1454 } 1455 1456 static void 1457 domark(int signo __unused) 1458 { 1459 1460 MarkSet = 1; 1461 } 1462 1463 /* 1464 * Print syslogd errors some place. 1465 */ 1466 static void 1467 logerror(const char *type) 1468 { 1469 char buf[512]; 1470 static int recursed = 0; 1471 1472 /* If there's an error while trying to log an error, give up. */ 1473 if (recursed) 1474 return; 1475 recursed++; 1476 if (errno) 1477 (void)snprintf(buf, 1478 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1479 else 1480 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1481 errno = 0; 1482 dprintf("%s\n", buf); 1483 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1484 recursed--; 1485 } 1486 1487 static void 1488 die(int signo) 1489 { 1490 struct filed *f; 1491 struct funix *fx; 1492 int was_initialized; 1493 char buf[100]; 1494 1495 was_initialized = Initialized; 1496 Initialized = 0; /* Don't log SIGCHLDs. */ 1497 for (f = Files; f != NULL; f = f->f_next) { 1498 /* flush any pending output */ 1499 if (f->f_prevcount) 1500 fprintlog(f, 0, (char *)NULL); 1501 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1502 (void)close(f->f_file); 1503 f->f_un.f_pipe.f_pid = 0; 1504 } 1505 } 1506 Initialized = was_initialized; 1507 if (signo) { 1508 dprintf("syslogd: exiting on signal %d\n", signo); 1509 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1510 errno = 0; 1511 logerror(buf); 1512 } 1513 STAILQ_FOREACH(fx, &funixes, next) 1514 (void)unlink(fx->name); 1515 pidfile_remove(pfh); 1516 1517 exit(1); 1518 } 1519 1520 /* 1521 * INIT -- Initialize syslogd from configuration table 1522 */ 1523 static void 1524 init(int signo) 1525 { 1526 int i; 1527 FILE *cf; 1528 struct filed *f, *next, **nextp; 1529 char *p; 1530 char cline[LINE_MAX]; 1531 char prog[NAME_MAX+1]; 1532 char host[MAXHOSTNAMELEN]; 1533 char oldLocalHostName[MAXHOSTNAMELEN]; 1534 char hostMsg[2*MAXHOSTNAMELEN+40]; 1535 char bootfileMsg[LINE_MAX]; 1536 1537 dprintf("init\n"); 1538 1539 /* 1540 * Load hostname (may have changed). 1541 */ 1542 if (signo != 0) 1543 (void)strlcpy(oldLocalHostName, LocalHostName, 1544 sizeof(oldLocalHostName)); 1545 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1546 err(EX_OSERR, "gethostname() failed"); 1547 if ((p = strchr(LocalHostName, '.')) != NULL) { 1548 *p++ = '\0'; 1549 LocalDomain = p; 1550 } else { 1551 LocalDomain = ""; 1552 } 1553 1554 /* 1555 * Close all open log files. 1556 */ 1557 Initialized = 0; 1558 for (f = Files; f != NULL; f = next) { 1559 /* flush any pending output */ 1560 if (f->f_prevcount) 1561 fprintlog(f, 0, (char *)NULL); 1562 1563 switch (f->f_type) { 1564 case F_FILE: 1565 case F_FORW: 1566 case F_CONSOLE: 1567 case F_TTY: 1568 (void)close(f->f_file); 1569 break; 1570 case F_PIPE: 1571 if (f->f_un.f_pipe.f_pid > 0) { 1572 (void)close(f->f_file); 1573 deadq_enter(f->f_un.f_pipe.f_pid, 1574 f->f_un.f_pipe.f_pname); 1575 } 1576 f->f_un.f_pipe.f_pid = 0; 1577 break; 1578 } 1579 next = f->f_next; 1580 if (f->f_program) free(f->f_program); 1581 if (f->f_host) free(f->f_host); 1582 free((char *)f); 1583 } 1584 Files = NULL; 1585 nextp = &Files; 1586 1587 /* open the configuration file */ 1588 if ((cf = fopen(ConfFile, "r")) == NULL) { 1589 dprintf("cannot open %s\n", ConfFile); 1590 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1591 if (*nextp == NULL) { 1592 logerror("calloc"); 1593 exit(1); 1594 } 1595 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1596 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1597 if ((*nextp)->f_next == NULL) { 1598 logerror("calloc"); 1599 exit(1); 1600 } 1601 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1602 Initialized = 1; 1603 return; 1604 } 1605 1606 /* 1607 * Foreach line in the conf table, open that file. 1608 */ 1609 f = NULL; 1610 (void)strlcpy(host, "*", sizeof(host)); 1611 (void)strlcpy(prog, "*", sizeof(prog)); 1612 while (fgets(cline, sizeof(cline), cf) != NULL) { 1613 /* 1614 * check for end-of-section, comments, strip off trailing 1615 * spaces and newline character. #!prog is treated specially: 1616 * following lines apply only to that program. 1617 */ 1618 for (p = cline; isspace(*p); ++p) 1619 continue; 1620 if (*p == 0) 1621 continue; 1622 if (*p == '#') { 1623 p++; 1624 if (*p != '!' && *p != '+' && *p != '-') 1625 continue; 1626 } 1627 if (*p == '+' || *p == '-') { 1628 host[0] = *p++; 1629 while (isspace(*p)) 1630 p++; 1631 if ((!*p) || (*p == '*')) { 1632 (void)strlcpy(host, "*", sizeof(host)); 1633 continue; 1634 } 1635 if (*p == '@') 1636 p = LocalHostName; 1637 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1638 if (!isalnum(*p) && *p != '.' && *p != '-' 1639 && *p != ',' && *p != ':' && *p != '%') 1640 break; 1641 host[i] = *p++; 1642 } 1643 host[i] = '\0'; 1644 continue; 1645 } 1646 if (*p == '!') { 1647 p++; 1648 while (isspace(*p)) p++; 1649 if ((!*p) || (*p == '*')) { 1650 (void)strlcpy(prog, "*", sizeof(prog)); 1651 continue; 1652 } 1653 for (i = 0; i < NAME_MAX; i++) { 1654 if (!isprint(p[i]) || isspace(p[i])) 1655 break; 1656 prog[i] = p[i]; 1657 } 1658 prog[i] = 0; 1659 continue; 1660 } 1661 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1662 cline[i] = '\0'; 1663 f = (struct filed *)calloc(1, sizeof(*f)); 1664 if (f == NULL) { 1665 logerror("calloc"); 1666 exit(1); 1667 } 1668 *nextp = f; 1669 nextp = &f->f_next; 1670 cfline(cline, f, prog, host); 1671 } 1672 1673 /* close the configuration file */ 1674 (void)fclose(cf); 1675 1676 Initialized = 1; 1677 1678 if (Debug) { 1679 int port; 1680 for (f = Files; f; f = f->f_next) { 1681 for (i = 0; i <= LOG_NFACILITIES; i++) 1682 if (f->f_pmask[i] == INTERNAL_NOPRI) 1683 printf("X "); 1684 else 1685 printf("%d ", f->f_pmask[i]); 1686 printf("%s: ", TypeNames[f->f_type]); 1687 switch (f->f_type) { 1688 case F_FILE: 1689 printf("%s", f->f_un.f_fname); 1690 break; 1691 1692 case F_CONSOLE: 1693 case F_TTY: 1694 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1695 break; 1696 1697 case F_FORW: 1698 port = (int)ntohs(((struct sockaddr_in *) 1699 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1700 if (port != 514) { 1701 printf("%s:%d", 1702 f->f_un.f_forw.f_hname, port); 1703 } else { 1704 printf("%s", f->f_un.f_forw.f_hname); 1705 } 1706 break; 1707 1708 case F_PIPE: 1709 printf("%s", f->f_un.f_pipe.f_pname); 1710 break; 1711 1712 case F_USERS: 1713 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1714 printf("%s, ", f->f_un.f_uname[i]); 1715 break; 1716 } 1717 if (f->f_program) 1718 printf(" (%s)", f->f_program); 1719 printf("\n"); 1720 } 1721 } 1722 1723 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1724 dprintf("syslogd: restarted\n"); 1725 /* 1726 * Log a change in hostname, but only on a restart. 1727 */ 1728 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1729 (void)snprintf(hostMsg, sizeof(hostMsg), 1730 "syslogd: hostname changed, \"%s\" to \"%s\"", 1731 oldLocalHostName, LocalHostName); 1732 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1733 dprintf("%s\n", hostMsg); 1734 } 1735 /* 1736 * Log the kernel boot file if we aren't going to use it as 1737 * the prefix, and if this is *not* a restart. 1738 */ 1739 if (signo == 0 && !use_bootfile) { 1740 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1741 "syslogd: kernel boot file is %s", bootfile); 1742 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1743 dprintf("%s\n", bootfileMsg); 1744 } 1745 } 1746 1747 /* 1748 * Crack a configuration file line 1749 */ 1750 static void 1751 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1752 { 1753 struct addrinfo hints, *res; 1754 int error, i, pri, syncfile; 1755 const char *p, *q; 1756 char *bp; 1757 char buf[MAXLINE], ebuf[100]; 1758 1759 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1760 1761 errno = 0; /* keep strerror() stuff out of logerror messages */ 1762 1763 /* clear out file entry */ 1764 memset(f, 0, sizeof(*f)); 1765 for (i = 0; i <= LOG_NFACILITIES; i++) 1766 f->f_pmask[i] = INTERNAL_NOPRI; 1767 1768 /* save hostname if any */ 1769 if (host && *host == '*') 1770 host = NULL; 1771 if (host) { 1772 int hl; 1773 1774 f->f_host = strdup(host); 1775 if (f->f_host == NULL) { 1776 logerror("strdup"); 1777 exit(1); 1778 } 1779 hl = strlen(f->f_host); 1780 if (hl > 0 && f->f_host[hl-1] == '.') 1781 f->f_host[--hl] = '\0'; 1782 trimdomain(f->f_host, hl); 1783 } 1784 1785 /* save program name if any */ 1786 if (prog && *prog == '*') 1787 prog = NULL; 1788 if (prog) { 1789 f->f_program = strdup(prog); 1790 if (f->f_program == NULL) { 1791 logerror("strdup"); 1792 exit(1); 1793 } 1794 } 1795 1796 /* scan through the list of selectors */ 1797 for (p = line; *p && *p != '\t' && *p != ' ';) { 1798 int pri_done; 1799 int pri_cmp; 1800 int pri_invert; 1801 1802 /* find the end of this facility name list */ 1803 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1804 continue; 1805 1806 /* get the priority comparison */ 1807 pri_cmp = 0; 1808 pri_done = 0; 1809 pri_invert = 0; 1810 if (*q == '!') { 1811 pri_invert = 1; 1812 q++; 1813 } 1814 while (!pri_done) { 1815 switch (*q) { 1816 case '<': 1817 pri_cmp |= PRI_LT; 1818 q++; 1819 break; 1820 case '=': 1821 pri_cmp |= PRI_EQ; 1822 q++; 1823 break; 1824 case '>': 1825 pri_cmp |= PRI_GT; 1826 q++; 1827 break; 1828 default: 1829 pri_done++; 1830 break; 1831 } 1832 } 1833 1834 /* collect priority name */ 1835 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1836 *bp++ = *q++; 1837 *bp = '\0'; 1838 1839 /* skip cruft */ 1840 while (strchr(",;", *q)) 1841 q++; 1842 1843 /* decode priority name */ 1844 if (*buf == '*') { 1845 pri = LOG_PRIMASK; 1846 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1847 } else { 1848 /* Ignore trailing spaces. */ 1849 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1850 buf[i] = '\0'; 1851 1852 pri = decode(buf, prioritynames); 1853 if (pri < 0) { 1854 (void)snprintf(ebuf, sizeof ebuf, 1855 "unknown priority name \"%s\"", buf); 1856 logerror(ebuf); 1857 return; 1858 } 1859 } 1860 if (!pri_cmp) 1861 pri_cmp = (UniquePriority) 1862 ? (PRI_EQ) 1863 : (PRI_EQ | PRI_GT) 1864 ; 1865 if (pri_invert) 1866 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1867 1868 /* scan facilities */ 1869 while (*p && !strchr("\t.; ", *p)) { 1870 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1871 *bp++ = *p++; 1872 *bp = '\0'; 1873 1874 if (*buf == '*') { 1875 for (i = 0; i < LOG_NFACILITIES; i++) { 1876 f->f_pmask[i] = pri; 1877 f->f_pcmp[i] = pri_cmp; 1878 } 1879 } else { 1880 i = decode(buf, facilitynames); 1881 if (i < 0) { 1882 (void)snprintf(ebuf, sizeof ebuf, 1883 "unknown facility name \"%s\"", 1884 buf); 1885 logerror(ebuf); 1886 return; 1887 } 1888 f->f_pmask[i >> 3] = pri; 1889 f->f_pcmp[i >> 3] = pri_cmp; 1890 } 1891 while (*p == ',' || *p == ' ') 1892 p++; 1893 } 1894 1895 p = q; 1896 } 1897 1898 /* skip to action part */ 1899 while (*p == '\t' || *p == ' ') 1900 p++; 1901 1902 if (*p == '-') { 1903 syncfile = 0; 1904 p++; 1905 } else 1906 syncfile = 1; 1907 1908 switch (*p) { 1909 case '@': 1910 { 1911 char *tp; 1912 /* 1913 * scan forward to see if there is a port defined. 1914 * so we can't use strlcpy.. 1915 */ 1916 i = sizeof(f->f_un.f_forw.f_hname); 1917 tp = f->f_un.f_forw.f_hname; 1918 p++; 1919 1920 while (*p && (*p != ':') && (i-- > 0)) { 1921 *tp++ = *p++; 1922 } 1923 *tp = '\0'; 1924 } 1925 /* See if we copied a domain and have a port */ 1926 if (*p == ':') 1927 p++; 1928 else 1929 p = NULL; 1930 1931 memset(&hints, 0, sizeof(hints)); 1932 hints.ai_family = family; 1933 hints.ai_socktype = SOCK_DGRAM; 1934 error = getaddrinfo(f->f_un.f_forw.f_hname, 1935 p ? p : "syslog", &hints, &res); 1936 if (error) { 1937 logerror(gai_strerror(error)); 1938 break; 1939 } 1940 f->f_un.f_forw.f_addr = res; 1941 f->f_type = F_FORW; 1942 break; 1943 1944 case '/': 1945 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1946 f->f_type = F_UNUSED; 1947 logerror(p); 1948 break; 1949 } 1950 if (syncfile) 1951 f->f_flags |= FFLAG_SYNC; 1952 if (isatty(f->f_file)) { 1953 if (strcmp(p, ctty) == 0) 1954 f->f_type = F_CONSOLE; 1955 else 1956 f->f_type = F_TTY; 1957 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1958 sizeof(f->f_un.f_fname)); 1959 } else { 1960 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1961 f->f_type = F_FILE; 1962 } 1963 break; 1964 1965 case '|': 1966 f->f_un.f_pipe.f_pid = 0; 1967 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 1968 sizeof(f->f_un.f_pipe.f_pname)); 1969 f->f_type = F_PIPE; 1970 break; 1971 1972 case '*': 1973 f->f_type = F_WALL; 1974 break; 1975 1976 default: 1977 for (i = 0; i < MAXUNAMES && *p; i++) { 1978 for (q = p; *q && *q != ','; ) 1979 q++; 1980 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1981 if ((q - p) > UT_NAMESIZE) 1982 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1983 else 1984 f->f_un.f_uname[i][q - p] = '\0'; 1985 while (*q == ',' || *q == ' ') 1986 q++; 1987 p = q; 1988 } 1989 f->f_type = F_USERS; 1990 break; 1991 } 1992 } 1993 1994 1995 /* 1996 * Decode a symbolic name to a numeric value 1997 */ 1998 static int 1999 decode(const char *name, CODE *codetab) 2000 { 2001 CODE *c; 2002 char *p, buf[40]; 2003 2004 if (isdigit(*name)) 2005 return (atoi(name)); 2006 2007 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2008 if (isupper(*name)) 2009 *p = tolower(*name); 2010 else 2011 *p = *name; 2012 } 2013 *p = '\0'; 2014 for (c = codetab; c->c_name; c++) 2015 if (!strcmp(buf, c->c_name)) 2016 return (c->c_val); 2017 2018 return (-1); 2019 } 2020 2021 static void 2022 markit(void) 2023 { 2024 struct filed *f; 2025 dq_t q, next; 2026 2027 now = time((time_t *)NULL); 2028 MarkSeq += TIMERINTVL; 2029 if (MarkSeq >= MarkInterval) { 2030 logmsg(LOG_INFO, "-- MARK --", 2031 LocalHostName, ADDDATE|MARK); 2032 MarkSeq = 0; 2033 } 2034 2035 for (f = Files; f; f = f->f_next) { 2036 if (f->f_prevcount && now >= REPEATTIME(f)) { 2037 dprintf("flush %s: repeated %d times, %d sec.\n", 2038 TypeNames[f->f_type], f->f_prevcount, 2039 repeatinterval[f->f_repeatcount]); 2040 fprintlog(f, 0, (char *)NULL); 2041 BACKOFF(f); 2042 } 2043 } 2044 2045 /* Walk the dead queue, and see if we should signal somebody. */ 2046 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2047 next = TAILQ_NEXT(q, dq_entries); 2048 2049 switch (q->dq_timeout) { 2050 case 0: 2051 /* Already signalled once, try harder now. */ 2052 if (kill(q->dq_pid, SIGKILL) != 0) 2053 (void)deadq_remove(q->dq_pid); 2054 break; 2055 2056 case 1: 2057 /* 2058 * Timed out on dead queue, send terminate 2059 * signal. Note that we leave the removal 2060 * from the dead queue to reapchild(), which 2061 * will also log the event (unless the process 2062 * didn't even really exist, in case we simply 2063 * drop it from the dead queue). 2064 */ 2065 if (kill(q->dq_pid, SIGTERM) != 0) 2066 (void)deadq_remove(q->dq_pid); 2067 /* FALLTHROUGH */ 2068 2069 default: 2070 q->dq_timeout--; 2071 } 2072 } 2073 MarkSet = 0; 2074 (void)alarm(TIMERINTVL); 2075 } 2076 2077 /* 2078 * fork off and become a daemon, but wait for the child to come online 2079 * before returing to the parent, or we get disk thrashing at boot etc. 2080 * Set a timer so we don't hang forever if it wedges. 2081 */ 2082 static int 2083 waitdaemon(int nochdir, int noclose, int maxwait) 2084 { 2085 int fd; 2086 int status; 2087 pid_t pid, childpid; 2088 2089 switch (childpid = fork()) { 2090 case -1: 2091 return (-1); 2092 case 0: 2093 break; 2094 default: 2095 signal(SIGALRM, timedout); 2096 alarm(maxwait); 2097 while ((pid = wait3(&status, 0, NULL)) != -1) { 2098 if (WIFEXITED(status)) 2099 errx(1, "child pid %d exited with return code %d", 2100 pid, WEXITSTATUS(status)); 2101 if (WIFSIGNALED(status)) 2102 errx(1, "child pid %d exited on signal %d%s", 2103 pid, WTERMSIG(status), 2104 WCOREDUMP(status) ? " (core dumped)" : 2105 ""); 2106 if (pid == childpid) /* it's gone... */ 2107 break; 2108 } 2109 exit(0); 2110 } 2111 2112 if (setsid() == -1) 2113 return (-1); 2114 2115 if (!nochdir) 2116 (void)chdir("/"); 2117 2118 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2119 (void)dup2(fd, STDIN_FILENO); 2120 (void)dup2(fd, STDOUT_FILENO); 2121 (void)dup2(fd, STDERR_FILENO); 2122 if (fd > 2) 2123 (void)close (fd); 2124 } 2125 return (getppid()); 2126 } 2127 2128 /* 2129 * We get a SIGALRM from the child when it's running and finished doing it's 2130 * fsync()'s or O_SYNC writes for all the boot messages. 2131 * 2132 * We also get a signal from the kernel if the timer expires, so check to 2133 * see what happened. 2134 */ 2135 static void 2136 timedout(int sig __unused) 2137 { 2138 int left; 2139 left = alarm(0); 2140 signal(SIGALRM, SIG_DFL); 2141 if (left == 0) 2142 errx(1, "timed out waiting for child"); 2143 else 2144 _exit(0); 2145 } 2146 2147 /* 2148 * Add `s' to the list of allowable peer addresses to accept messages 2149 * from. 2150 * 2151 * `s' is a string in the form: 2152 * 2153 * [*]domainname[:{servicename|portnumber|*}] 2154 * 2155 * or 2156 * 2157 * netaddr/maskbits[:{servicename|portnumber|*}] 2158 * 2159 * Returns -1 on error, 0 if the argument was valid. 2160 */ 2161 static int 2162 allowaddr(char *s) 2163 { 2164 char *cp1, *cp2; 2165 struct allowedpeer ap; 2166 struct servent *se; 2167 int masklen = -1, i; 2168 struct addrinfo hints, *res; 2169 struct in_addr *addrp, *maskp; 2170 u_int32_t *addr6p, *mask6p; 2171 char ip[NI_MAXHOST]; 2172 2173 #ifdef INET6 2174 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2175 #endif 2176 cp1 = s; 2177 if ((cp1 = strrchr(cp1, ':'))) { 2178 /* service/port provided */ 2179 *cp1++ = '\0'; 2180 if (strlen(cp1) == 1 && *cp1 == '*') 2181 /* any port allowed */ 2182 ap.port = 0; 2183 else if ((se = getservbyname(cp1, "udp"))) { 2184 ap.port = ntohs(se->s_port); 2185 } else { 2186 ap.port = strtol(cp1, &cp2, 0); 2187 if (*cp2 != '\0') 2188 return (-1); /* port not numeric */ 2189 } 2190 } else { 2191 if ((se = getservbyname("syslog", "udp"))) 2192 ap.port = ntohs(se->s_port); 2193 else 2194 /* sanity, should not happen */ 2195 ap.port = 514; 2196 } 2197 2198 if ((cp1 = strchr(s, '/')) != NULL && 2199 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2200 *cp1 = '\0'; 2201 if ((masklen = atoi(cp1 + 1)) < 0) 2202 return (-1); 2203 } 2204 #ifdef INET6 2205 if (*s == '[') { 2206 cp2 = s + strlen(s) - 1; 2207 if (*cp2 == ']') { 2208 ++s; 2209 *cp2 = '\0'; 2210 } else { 2211 cp2 = NULL; 2212 } 2213 } else { 2214 cp2 = NULL; 2215 } 2216 #endif 2217 memset(&hints, 0, sizeof(hints)); 2218 hints.ai_family = PF_UNSPEC; 2219 hints.ai_socktype = SOCK_DGRAM; 2220 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2221 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2222 ap.isnumeric = 1; 2223 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2224 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2225 ap.a_mask.ss_family = res->ai_family; 2226 if (res->ai_family == AF_INET) { 2227 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2228 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2229 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2230 if (masklen < 0) { 2231 /* use default netmask */ 2232 if (IN_CLASSA(ntohl(addrp->s_addr))) 2233 maskp->s_addr = htonl(IN_CLASSA_NET); 2234 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2235 maskp->s_addr = htonl(IN_CLASSB_NET); 2236 else 2237 maskp->s_addr = htonl(IN_CLASSC_NET); 2238 } else if (masklen <= 32) { 2239 /* convert masklen to netmask */ 2240 if (masklen == 0) 2241 maskp->s_addr = 0; 2242 else 2243 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2244 } else { 2245 freeaddrinfo(res); 2246 return (-1); 2247 } 2248 /* Lose any host bits in the network number. */ 2249 addrp->s_addr &= maskp->s_addr; 2250 } 2251 #ifdef INET6 2252 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2253 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2254 if (masklen < 0) 2255 masklen = 128; 2256 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2257 /* convert masklen to netmask */ 2258 while (masklen > 0) { 2259 if (masklen < 32) { 2260 *mask6p = htonl(~(0xffffffff >> masklen)); 2261 break; 2262 } 2263 *mask6p++ = 0xffffffff; 2264 masklen -= 32; 2265 } 2266 /* Lose any host bits in the network number. */ 2267 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2268 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2269 for (i = 0; i < 4; i++) 2270 addr6p[i] &= mask6p[i]; 2271 } 2272 #endif 2273 else { 2274 freeaddrinfo(res); 2275 return (-1); 2276 } 2277 freeaddrinfo(res); 2278 } else { 2279 /* arg `s' is domain name */ 2280 ap.isnumeric = 0; 2281 ap.a_name = s; 2282 if (cp1) 2283 *cp1 = '/'; 2284 #ifdef INET6 2285 if (cp2) { 2286 *cp2 = ']'; 2287 --s; 2288 } 2289 #endif 2290 } 2291 2292 if (Debug) { 2293 printf("allowaddr: rule %d: ", NumAllowed); 2294 if (ap.isnumeric) { 2295 printf("numeric, "); 2296 getnameinfo((struct sockaddr *)&ap.a_addr, 2297 ((struct sockaddr *)&ap.a_addr)->sa_len, 2298 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2299 printf("addr = %s, ", ip); 2300 getnameinfo((struct sockaddr *)&ap.a_mask, 2301 ((struct sockaddr *)&ap.a_mask)->sa_len, 2302 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2303 printf("mask = %s; ", ip); 2304 } else { 2305 printf("domainname = %s; ", ap.a_name); 2306 } 2307 printf("port = %d\n", ap.port); 2308 } 2309 2310 if ((AllowedPeers = realloc(AllowedPeers, 2311 ++NumAllowed * sizeof(struct allowedpeer))) 2312 == NULL) { 2313 logerror("realloc"); 2314 exit(1); 2315 } 2316 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2317 return (0); 2318 } 2319 2320 /* 2321 * Validate that the remote peer has permission to log to us. 2322 */ 2323 static int 2324 validate(struct sockaddr *sa, const char *hname) 2325 { 2326 int i, j, reject; 2327 size_t l1, l2; 2328 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2329 struct allowedpeer *ap; 2330 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2331 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2332 struct addrinfo hints, *res; 2333 u_short sport; 2334 2335 if (NumAllowed == 0) 2336 /* traditional behaviour, allow everything */ 2337 return (1); 2338 2339 (void)strlcpy(name, hname, sizeof(name)); 2340 memset(&hints, 0, sizeof(hints)); 2341 hints.ai_family = PF_UNSPEC; 2342 hints.ai_socktype = SOCK_DGRAM; 2343 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2344 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2345 freeaddrinfo(res); 2346 else if (strchr(name, '.') == NULL) { 2347 strlcat(name, ".", sizeof name); 2348 strlcat(name, LocalDomain, sizeof name); 2349 } 2350 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2351 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2352 return (0); /* for safety, should not occur */ 2353 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2354 ip, port, name); 2355 sport = atoi(port); 2356 2357 /* now, walk down the list */ 2358 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2359 if (ap->port != 0 && ap->port != sport) { 2360 dprintf("rejected in rule %d due to port mismatch.\n", i); 2361 continue; 2362 } 2363 2364 if (ap->isnumeric) { 2365 if (ap->a_addr.ss_family != sa->sa_family) { 2366 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2367 continue; 2368 } 2369 if (ap->a_addr.ss_family == AF_INET) { 2370 sin4 = (struct sockaddr_in *)sa; 2371 a4p = (struct sockaddr_in *)&ap->a_addr; 2372 m4p = (struct sockaddr_in *)&ap->a_mask; 2373 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2374 != a4p->sin_addr.s_addr) { 2375 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2376 continue; 2377 } 2378 } 2379 #ifdef INET6 2380 else if (ap->a_addr.ss_family == AF_INET6) { 2381 sin6 = (struct sockaddr_in6 *)sa; 2382 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2383 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2384 if (a6p->sin6_scope_id != 0 && 2385 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2386 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2387 continue; 2388 } 2389 reject = 0; 2390 for (j = 0; j < 16; j += 4) { 2391 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2392 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2393 ++reject; 2394 break; 2395 } 2396 } 2397 if (reject) { 2398 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2399 continue; 2400 } 2401 } 2402 #endif 2403 else 2404 continue; 2405 } else { 2406 cp = ap->a_name; 2407 l1 = strlen(name); 2408 if (*cp == '*') { 2409 /* allow wildmatch */ 2410 cp++; 2411 l2 = strlen(cp); 2412 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2413 dprintf("rejected in rule %d due to name mismatch.\n", i); 2414 continue; 2415 } 2416 } else { 2417 /* exact match */ 2418 l2 = strlen(cp); 2419 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2420 dprintf("rejected in rule %d due to name mismatch.\n", i); 2421 continue; 2422 } 2423 } 2424 } 2425 dprintf("accepted in rule %d.\n", i); 2426 return (1); /* hooray! */ 2427 } 2428 return (0); 2429 } 2430 2431 /* 2432 * Fairly similar to popen(3), but returns an open descriptor, as 2433 * opposed to a FILE *. 2434 */ 2435 static int 2436 p_open(const char *prog, pid_t *rpid) 2437 { 2438 int pfd[2], nulldesc, i; 2439 pid_t pid; 2440 sigset_t omask, mask; 2441 char *argv[4]; /* sh -c cmd NULL */ 2442 char errmsg[200]; 2443 2444 if (pipe(pfd) == -1) 2445 return (-1); 2446 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2447 /* we are royally screwed anyway */ 2448 return (-1); 2449 2450 sigemptyset(&mask); 2451 sigaddset(&mask, SIGALRM); 2452 sigaddset(&mask, SIGHUP); 2453 sigprocmask(SIG_BLOCK, &mask, &omask); 2454 switch ((pid = fork())) { 2455 case -1: 2456 sigprocmask(SIG_SETMASK, &omask, 0); 2457 close(nulldesc); 2458 return (-1); 2459 2460 case 0: 2461 argv[0] = strdup("sh"); 2462 argv[1] = strdup("-c"); 2463 argv[2] = strdup(prog); 2464 argv[3] = NULL; 2465 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2466 logerror("strdup"); 2467 exit(1); 2468 } 2469 2470 alarm(0); 2471 (void)setsid(); /* Avoid catching SIGHUPs. */ 2472 2473 /* 2474 * Throw away pending signals, and reset signal 2475 * behaviour to standard values. 2476 */ 2477 signal(SIGALRM, SIG_IGN); 2478 signal(SIGHUP, SIG_IGN); 2479 sigprocmask(SIG_SETMASK, &omask, 0); 2480 signal(SIGPIPE, SIG_DFL); 2481 signal(SIGQUIT, SIG_DFL); 2482 signal(SIGALRM, SIG_DFL); 2483 signal(SIGHUP, SIG_DFL); 2484 2485 dup2(pfd[0], STDIN_FILENO); 2486 dup2(nulldesc, STDOUT_FILENO); 2487 dup2(nulldesc, STDERR_FILENO); 2488 for (i = getdtablesize(); i > 2; i--) 2489 (void)close(i); 2490 2491 (void)execvp(_PATH_BSHELL, argv); 2492 _exit(255); 2493 } 2494 2495 sigprocmask(SIG_SETMASK, &omask, 0); 2496 close(nulldesc); 2497 close(pfd[0]); 2498 /* 2499 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2500 * supposed to get an EWOULDBLOCK on writev(2), which is 2501 * caught by the logic above anyway, which will in turn close 2502 * the pipe, and fork a new logging subprocess if necessary. 2503 * The stale subprocess will be killed some time later unless 2504 * it terminated itself due to closing its input pipe (so we 2505 * get rid of really dead puppies). 2506 */ 2507 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2508 /* This is bad. */ 2509 (void)snprintf(errmsg, sizeof errmsg, 2510 "Warning: cannot change pipe to PID %d to " 2511 "non-blocking behaviour.", 2512 (int)pid); 2513 logerror(errmsg); 2514 } 2515 *rpid = pid; 2516 return (pfd[1]); 2517 } 2518 2519 static void 2520 deadq_enter(pid_t pid, const char *name) 2521 { 2522 dq_t p; 2523 int status; 2524 2525 /* 2526 * Be paranoid, if we can't signal the process, don't enter it 2527 * into the dead queue (perhaps it's already dead). If possible, 2528 * we try to fetch and log the child's status. 2529 */ 2530 if (kill(pid, 0) != 0) { 2531 if (waitpid(pid, &status, WNOHANG) > 0) 2532 log_deadchild(pid, status, name); 2533 return; 2534 } 2535 2536 p = malloc(sizeof(struct deadq_entry)); 2537 if (p == NULL) { 2538 logerror("malloc"); 2539 exit(1); 2540 } 2541 2542 p->dq_pid = pid; 2543 p->dq_timeout = DQ_TIMO_INIT; 2544 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2545 } 2546 2547 static int 2548 deadq_remove(pid_t pid) 2549 { 2550 dq_t q; 2551 2552 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2553 if (q->dq_pid == pid) { 2554 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2555 free(q); 2556 return (1); 2557 } 2558 } 2559 2560 return (0); 2561 } 2562 2563 static void 2564 log_deadchild(pid_t pid, int status, const char *name) 2565 { 2566 int code; 2567 char buf[256]; 2568 const char *reason; 2569 2570 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2571 if (WIFSIGNALED(status)) { 2572 reason = "due to signal"; 2573 code = WTERMSIG(status); 2574 } else { 2575 reason = "with status"; 2576 code = WEXITSTATUS(status); 2577 if (code == 0) 2578 return; 2579 } 2580 (void)snprintf(buf, sizeof buf, 2581 "Logging subprocess %d (%s) exited %s %d.", 2582 pid, name, reason, code); 2583 logerror(buf); 2584 } 2585 2586 static int * 2587 socksetup(int af, const char *bindhostname) 2588 { 2589 struct addrinfo hints, *res, *r; 2590 int error, maxs, *s, *socks; 2591 2592 memset(&hints, 0, sizeof(hints)); 2593 hints.ai_flags = AI_PASSIVE; 2594 hints.ai_family = af; 2595 hints.ai_socktype = SOCK_DGRAM; 2596 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2597 if (error) { 2598 logerror(gai_strerror(error)); 2599 errno = 0; 2600 die(0); 2601 } 2602 2603 /* Count max number of sockets we may open */ 2604 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2605 socks = malloc((maxs+1) * sizeof(int)); 2606 if (socks == NULL) { 2607 logerror("couldn't allocate memory for sockets"); 2608 die(0); 2609 } 2610 2611 *socks = 0; /* num of sockets counter at start of array */ 2612 s = socks + 1; 2613 for (r = res; r; r = r->ai_next) { 2614 int on = 1; 2615 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2616 if (*s < 0) { 2617 logerror("socket"); 2618 continue; 2619 } 2620 if (r->ai_family == AF_INET6) { 2621 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2622 (char *)&on, sizeof (on)) < 0) { 2623 logerror("setsockopt"); 2624 close(*s); 2625 continue; 2626 } 2627 } 2628 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2629 (char *)&on, sizeof (on)) < 0) { 2630 logerror("setsockopt"); 2631 close(*s); 2632 continue; 2633 } 2634 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2635 close(*s); 2636 logerror("bind"); 2637 continue; 2638 } 2639 2640 double_rbuf(*s); 2641 2642 (*socks)++; 2643 s++; 2644 } 2645 2646 if (*socks == 0) { 2647 free(socks); 2648 if (Debug) 2649 return (NULL); 2650 else 2651 die(0); 2652 } 2653 if (res) 2654 freeaddrinfo(res); 2655 2656 return (socks); 2657 } 2658 2659 static void 2660 double_rbuf(int fd) 2661 { 2662 socklen_t slen, len; 2663 2664 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2665 len *= 2; 2666 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, slen); 2667 } 2668 } 2669