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 MAXLINE /* 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 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 #include <sys/types.h> 92 93 #include <netinet/in.h> 94 #include <netdb.h> 95 #include <arpa/inet.h> 96 97 #include <ctype.h> 98 #include <dirent.h> 99 #include <err.h> 100 #include <errno.h> 101 #include <fcntl.h> 102 #include <libutil.h> 103 #include <limits.h> 104 #include <paths.h> 105 #include <signal.h> 106 #include <stdio.h> 107 #include <stdlib.h> 108 #include <string.h> 109 #include <sysexits.h> 110 #include <unistd.h> 111 #include <utmpx.h> 112 113 #include "pathnames.h" 114 #include "ttymsg.h" 115 116 #define SYSLOG_NAMES 117 #include <sys/syslog.h> 118 119 const char *ConfFile = _PATH_LOGCONF; 120 const char *PidFile = _PATH_LOGPID; 121 const char ctty[] = _PATH_CONSOLE; 122 static const char include_str[] = "include"; 123 static const char include_ext[] = ".conf"; 124 125 #define dprintf if (Debug) printf 126 127 #define MAXUNAMES 20 /* maximum number of user names */ 128 129 /* 130 * List of hosts for binding. 131 */ 132 static STAILQ_HEAD(, host) hqueue; 133 struct host { 134 char *name; 135 STAILQ_ENTRY(host) next; 136 }; 137 138 /* 139 * Unix sockets. 140 * We have two default sockets, one with 666 permissions, 141 * and one for privileged programs. 142 */ 143 struct funix { 144 int s; 145 const char *name; 146 mode_t mode; 147 STAILQ_ENTRY(funix) next; 148 }; 149 struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 150 { NULL } }; 151 struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 152 { &funix_secure } }; 153 154 STAILQ_HEAD(, funix) funixes = { &funix_default, 155 &(funix_secure.next.stqe_next) }; 156 157 /* 158 * Flags to logmsg(). 159 */ 160 161 #define IGN_CONS 0x001 /* don't print on console */ 162 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 163 #define ADDDATE 0x004 /* add a date to the message */ 164 #define MARK 0x008 /* this message is a mark */ 165 #define ISKERNEL 0x010 /* kernel generated message */ 166 167 /* 168 * This structure represents the files that will have log 169 * copies printed. 170 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 171 * or if f_type if F_PIPE and f_pid > 0. 172 */ 173 174 struct filed { 175 struct filed *f_next; /* next in linked list */ 176 short f_type; /* entry type, see below */ 177 short f_file; /* file descriptor */ 178 time_t f_time; /* time this was last written */ 179 char *f_host; /* host from which to recd. */ 180 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 181 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 182 #define PRI_LT 0x1 183 #define PRI_EQ 0x2 184 #define PRI_GT 0x4 185 char *f_program; /* program this applies to */ 186 union { 187 char f_uname[MAXUNAMES][MAXLOGNAME]; 188 struct { 189 char f_hname[MAXHOSTNAMELEN]; 190 struct addrinfo *f_addr; 191 192 } f_forw; /* forwarding address */ 193 char f_fname[MAXPATHLEN]; 194 struct { 195 char f_pname[MAXPATHLEN]; 196 pid_t f_pid; 197 } f_pipe; 198 } f_un; 199 char f_prevline[MAXSVLINE]; /* last message logged */ 200 char f_lasttime[16]; /* time of last occurrence */ 201 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 202 int f_prevpri; /* pri of f_prevline */ 203 int f_prevlen; /* length of f_prevline */ 204 int f_prevcount; /* repetition cnt of prevline */ 205 u_int f_repeatcount; /* number of "repeated" msgs */ 206 int f_flags; /* file-specific flags */ 207 #define FFLAG_SYNC 0x01 208 #define FFLAG_NEEDSYNC 0x02 209 }; 210 211 /* 212 * Queue of about-to-be dead processes we should watch out for. 213 */ 214 215 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 216 struct stailhead *deadq_headp; 217 218 struct deadq_entry { 219 pid_t dq_pid; 220 int dq_timeout; 221 TAILQ_ENTRY(deadq_entry) dq_entries; 222 }; 223 224 /* 225 * The timeout to apply to processes waiting on the dead queue. Unit 226 * of measure is `mark intervals', i.e. 20 minutes by default. 227 * Processes on the dead queue will be terminated after that time. 228 */ 229 230 #define DQ_TIMO_INIT 2 231 232 typedef struct deadq_entry *dq_t; 233 234 235 /* 236 * Struct to hold records of network addresses that are allowed to log 237 * to us. 238 */ 239 struct allowedpeer { 240 int isnumeric; 241 u_short port; 242 union { 243 struct { 244 struct sockaddr_storage addr; 245 struct sockaddr_storage mask; 246 } numeric; 247 char *name; 248 } u; 249 #define a_addr u.numeric.addr 250 #define a_mask u.numeric.mask 251 #define a_name u.name 252 }; 253 254 255 /* 256 * Intervals at which we flush out "message repeated" messages, 257 * in seconds after previous message is logged. After each flush, 258 * we move to the next interval until we reach the largest. 259 */ 260 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 261 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 262 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 263 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 264 (f)->f_repeatcount = MAXREPEAT; \ 265 } 266 267 /* values for f_type */ 268 #define F_UNUSED 0 /* unused entry */ 269 #define F_FILE 1 /* regular file */ 270 #define F_TTY 2 /* terminal */ 271 #define F_CONSOLE 3 /* console terminal */ 272 #define F_FORW 4 /* remote machine */ 273 #define F_USERS 5 /* list of users */ 274 #define F_WALL 6 /* everyone logged on */ 275 #define F_PIPE 7 /* pipe to program */ 276 277 const char *TypeNames[8] = { 278 "UNUSED", "FILE", "TTY", "CONSOLE", 279 "FORW", "USERS", "WALL", "PIPE" 280 }; 281 282 static struct filed *Files; /* Log files that we write to */ 283 static struct filed consfile; /* Console */ 284 285 static int Debug; /* debug flag */ 286 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 287 static int resolve = 1; /* resolve hostname */ 288 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 289 static const char *LocalDomain; /* our local domain name */ 290 static int *finet; /* Internet datagram sockets */ 291 static int fklog = -1; /* /dev/klog */ 292 static int Initialized; /* set when we have initialized ourselves */ 293 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 294 static int MarkSeq; /* mark sequence number */ 295 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 296 static int SecureMode; /* when true, receive only unix domain socks */ 297 #ifdef INET6 298 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 299 #else 300 static int family = PF_INET; /* protocol family (IPv4 only) */ 301 #endif 302 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 303 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 304 static int use_bootfile; /* log entire bootfile for every kern msg */ 305 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 306 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 307 308 static char bootfile[MAXLINE+1]; /* booted kernel file */ 309 310 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 311 static int NumAllowed; /* Number of entries in AllowedPeers */ 312 static int RemoteAddDate; /* Always set the date on remote messages */ 313 314 static int UniquePriority; /* Only log specified priority? */ 315 static int LogFacPri; /* Put facility and priority in log message: */ 316 /* 0=no, 1=numeric, 2=names */ 317 static int KeepKernFac; /* Keep remotely logged kernel facility */ 318 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 319 static struct pidfh *pfh; 320 321 volatile sig_atomic_t MarkSet, WantDie; 322 323 static int allowaddr(char *); 324 static void cfline(const char *, struct filed *, 325 const char *, const char *); 326 static const char *cvthname(struct sockaddr *); 327 static void deadq_enter(pid_t, const char *); 328 static int deadq_remove(pid_t); 329 static int decode(const char *, const CODE *); 330 static void die(int) __dead2; 331 static void dodie(int); 332 static void dofsync(void); 333 static void domark(int); 334 static void fprintlog(struct filed *, int, const char *); 335 static int *socksetup(int, char *); 336 static void init(int); 337 static void logerror(const char *); 338 static void logmsg(int, const char *, const char *, int); 339 static void log_deadchild(pid_t, int, const char *); 340 static void markit(void); 341 static int skip_message(const char *, const char *, int); 342 static void printline(const char *, char *, int); 343 static void printsys(char *); 344 static int p_open(const char *, pid_t *); 345 static void readklog(void); 346 static void reapchild(int); 347 static const char *ttymsg_check(struct iovec *, int, char *, int); 348 static void usage(void); 349 static int validate(struct sockaddr *, const char *); 350 static void unmapped(struct sockaddr *); 351 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 352 static int waitdaemon(int, int, int); 353 static void timedout(int); 354 static void increase_rcvbuf(int); 355 356 static void 357 close_filed(struct filed *f) 358 { 359 360 if (f == NULL || f->f_file == -1) 361 return; 362 363 (void)close(f->f_file); 364 f->f_file = -1; 365 f->f_type = F_UNUSED; 366 } 367 368 int 369 main(int argc, char *argv[]) 370 { 371 int ch, i, fdsrmax = 0, l; 372 struct sockaddr_un sunx, fromunix; 373 struct sockaddr_storage frominet; 374 fd_set *fdsr = NULL; 375 char line[MAXLINE + 1]; 376 const char *hname; 377 struct timeval tv, *tvp; 378 struct sigaction sact; 379 struct host *host; 380 struct funix *fx, *fx1; 381 sigset_t mask; 382 pid_t ppid = 1, spid; 383 socklen_t len; 384 385 if (madvise(NULL, 0, MADV_PROTECT) != 0) 386 dprintf("madvise() failed: %s\n", strerror(errno)); 387 388 STAILQ_INIT(&hqueue); 389 390 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 391 != -1) 392 switch (ch) { 393 case '4': 394 family = PF_INET; 395 break; 396 #ifdef INET6 397 case '6': 398 family = PF_INET6; 399 break; 400 #endif 401 case '8': 402 mask_C1 = 0; 403 break; 404 case 'A': 405 send_to_all++; 406 break; 407 case 'a': /* allow specific network addresses only */ 408 if (allowaddr(optarg) == -1) 409 usage(); 410 break; 411 case 'b': 412 { 413 if ((host = malloc(sizeof(struct host))) == NULL) 414 err(1, "malloc failed"); 415 host->name = optarg; 416 STAILQ_INSERT_TAIL(&hqueue, host, next); 417 break; 418 } 419 case 'c': 420 no_compress++; 421 break; 422 case 'C': 423 logflags |= O_CREAT; 424 break; 425 case 'd': /* debug */ 426 Debug++; 427 break; 428 case 'f': /* configuration file */ 429 ConfFile = optarg; 430 break; 431 case 'F': /* run in foreground instead of daemon */ 432 Foreground++; 433 break; 434 case 'k': /* keep remote kern fac */ 435 KeepKernFac = 1; 436 break; 437 case 'l': 438 { 439 long perml; 440 mode_t mode; 441 char *name, *ep; 442 443 if (optarg[0] == '/') { 444 mode = DEFFILEMODE; 445 name = optarg; 446 } else if ((name = strchr(optarg, ':')) != NULL) { 447 *name++ = '\0'; 448 if (name[0] != '/') 449 errx(1, "socket name must be absolute " 450 "path"); 451 if (isdigit(*optarg)) { 452 perml = strtol(optarg, &ep, 8); 453 if (*ep || perml < 0 || 454 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 455 errx(1, "invalid mode %s, exiting", 456 optarg); 457 mode = (mode_t )perml; 458 } else 459 errx(1, "invalid mode %s, exiting", 460 optarg); 461 } else /* doesn't begin with '/', and no ':' */ 462 errx(1, "can't parse path %s", optarg); 463 464 if (strlen(name) >= sizeof(sunx.sun_path)) 465 errx(1, "%s path too long, exiting", name); 466 if ((fx = malloc(sizeof(struct funix))) == NULL) 467 err(1, "malloc failed"); 468 fx->s = -1; 469 fx->name = name; 470 fx->mode = mode; 471 STAILQ_INSERT_TAIL(&funixes, fx, next); 472 break; 473 } 474 case 'm': /* mark interval */ 475 MarkInterval = atoi(optarg) * 60; 476 break; 477 case 'N': 478 NoBind = 1; 479 SecureMode = 1; 480 break; 481 case 'n': 482 resolve = 0; 483 break; 484 case 'o': 485 use_bootfile = 1; 486 break; 487 case 'p': /* path */ 488 if (strlen(optarg) >= sizeof(sunx.sun_path)) 489 errx(1, "%s path too long, exiting", optarg); 490 funix_default.name = optarg; 491 break; 492 case 'P': /* path for alt. PID */ 493 PidFile = optarg; 494 break; 495 case 's': /* no network mode */ 496 SecureMode++; 497 break; 498 case 'S': /* path for privileged originator */ 499 if (strlen(optarg) >= sizeof(sunx.sun_path)) 500 errx(1, "%s path too long, exiting", optarg); 501 funix_secure.name = optarg; 502 break; 503 case 'T': 504 RemoteAddDate = 1; 505 break; 506 case 'u': /* only log specified priority */ 507 UniquePriority++; 508 break; 509 case 'v': /* log facility and priority */ 510 LogFacPri++; 511 break; 512 default: 513 usage(); 514 } 515 if ((argc -= optind) != 0) 516 usage(); 517 518 pfh = pidfile_open(PidFile, 0600, &spid); 519 if (pfh == NULL) { 520 if (errno == EEXIST) 521 errx(1, "syslogd already running, pid: %d", spid); 522 warn("cannot open pid file"); 523 } 524 525 if ((!Foreground) && (!Debug)) { 526 ppid = waitdaemon(0, 0, 30); 527 if (ppid < 0) { 528 warn("could not become daemon"); 529 pidfile_remove(pfh); 530 exit(1); 531 } 532 } else if (Debug) { 533 setlinebuf(stdout); 534 } 535 536 if (NumAllowed) 537 endservent(); 538 539 consfile.f_type = F_CONSOLE; 540 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 541 sizeof(consfile.f_un.f_fname)); 542 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 543 (void)signal(SIGTERM, dodie); 544 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 545 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 546 /* 547 * We don't want the SIGCHLD and SIGHUP handlers to interfere 548 * with each other; they are likely candidates for being called 549 * simultaneously (SIGHUP closes pipe descriptor, process dies, 550 * SIGCHLD happens). 551 */ 552 sigemptyset(&mask); 553 sigaddset(&mask, SIGHUP); 554 sact.sa_handler = reapchild; 555 sact.sa_mask = mask; 556 sact.sa_flags = SA_RESTART; 557 (void)sigaction(SIGCHLD, &sact, NULL); 558 (void)signal(SIGALRM, domark); 559 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 560 (void)alarm(TIMERINTVL); 561 562 TAILQ_INIT(&deadq_head); 563 564 #ifndef SUN_LEN 565 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 566 #endif 567 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 568 (void)unlink(fx->name); 569 memset(&sunx, 0, sizeof(sunx)); 570 sunx.sun_family = AF_LOCAL; 571 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 572 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 573 if (fx->s < 0 || 574 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 575 chmod(fx->name, fx->mode) < 0) { 576 (void)snprintf(line, sizeof line, 577 "cannot create %s", fx->name); 578 logerror(line); 579 dprintf("cannot create %s (%d)\n", fx->name, errno); 580 if (fx == &funix_default || fx == &funix_secure) 581 die(0); 582 else { 583 STAILQ_REMOVE(&funixes, fx, funix, next); 584 continue; 585 } 586 } 587 increase_rcvbuf(fx->s); 588 } 589 if (SecureMode <= 1) { 590 if (STAILQ_EMPTY(&hqueue)) 591 finet = socksetup(family, NULL); 592 STAILQ_FOREACH(host, &hqueue, next) { 593 int *finet0, total; 594 finet0 = socksetup(family, host->name); 595 if (finet0 && !finet) { 596 finet = finet0; 597 } else if (finet0 && finet) { 598 total = *finet0 + *finet + 1; 599 finet = realloc(finet, total * sizeof(int)); 600 if (finet == NULL) 601 err(1, "realloc failed"); 602 for (i = 1; i <= *finet0; i++) { 603 finet[(*finet)+i] = finet0[i]; 604 } 605 *finet = total - 1; 606 free(finet0); 607 } 608 } 609 } 610 611 if (finet) { 612 if (SecureMode) { 613 for (i = 0; i < *finet; i++) { 614 if (shutdown(finet[i+1], SHUT_RD) < 0 && 615 errno != ENOTCONN) { 616 logerror("shutdown"); 617 if (!Debug) 618 die(0); 619 } 620 } 621 } else { 622 dprintf("listening on inet and/or inet6 socket\n"); 623 } 624 dprintf("sending on inet and/or inet6 socket\n"); 625 } 626 627 if ((fklog = open(_PATH_KLOG, O_RDONLY|O_NONBLOCK, 0)) < 0) 628 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 629 630 /* tuck my process id away */ 631 pidfile_write(pfh); 632 633 dprintf("off & running....\n"); 634 635 init(0); 636 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 637 sigemptyset(&mask); 638 sigaddset(&mask, SIGCHLD); 639 sact.sa_handler = init; 640 sact.sa_mask = mask; 641 sact.sa_flags = SA_RESTART; 642 (void)sigaction(SIGHUP, &sact, NULL); 643 644 tvp = &tv; 645 tv.tv_sec = tv.tv_usec = 0; 646 647 if (fklog != -1 && fklog > fdsrmax) 648 fdsrmax = fklog; 649 if (finet && !SecureMode) { 650 for (i = 0; i < *finet; i++) { 651 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 652 fdsrmax = finet[i+1]; 653 } 654 } 655 STAILQ_FOREACH(fx, &funixes, next) 656 if (fx->s > fdsrmax) 657 fdsrmax = fx->s; 658 659 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 660 sizeof(fd_mask)); 661 if (fdsr == NULL) 662 errx(1, "calloc fd_set"); 663 664 for (;;) { 665 if (MarkSet) 666 markit(); 667 if (WantDie) 668 die(WantDie); 669 670 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 671 sizeof(fd_mask)); 672 673 if (fklog != -1) 674 FD_SET(fklog, fdsr); 675 if (finet && !SecureMode) { 676 for (i = 0; i < *finet; i++) { 677 if (finet[i+1] != -1) 678 FD_SET(finet[i+1], fdsr); 679 } 680 } 681 STAILQ_FOREACH(fx, &funixes, next) 682 FD_SET(fx->s, fdsr); 683 684 i = select(fdsrmax+1, fdsr, NULL, NULL, 685 needdofsync ? &tv : tvp); 686 switch (i) { 687 case 0: 688 dofsync(); 689 needdofsync = 0; 690 if (tvp) { 691 tvp = NULL; 692 if (ppid != 1) 693 kill(ppid, SIGALRM); 694 } 695 continue; 696 case -1: 697 if (errno != EINTR) 698 logerror("select"); 699 continue; 700 } 701 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 702 readklog(); 703 if (finet && !SecureMode) { 704 for (i = 0; i < *finet; i++) { 705 if (FD_ISSET(finet[i+1], fdsr)) { 706 len = sizeof(frominet); 707 l = recvfrom(finet[i+1], line, MAXLINE, 708 0, (struct sockaddr *)&frominet, 709 &len); 710 if (l > 0) { 711 line[l] = '\0'; 712 hname = cvthname((struct sockaddr *)&frominet); 713 unmapped((struct sockaddr *)&frominet); 714 if (validate((struct sockaddr *)&frominet, hname)) 715 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 716 } else if (l < 0 && errno != EINTR) 717 logerror("recvfrom inet"); 718 } 719 } 720 } 721 STAILQ_FOREACH(fx, &funixes, next) { 722 if (FD_ISSET(fx->s, fdsr)) { 723 len = sizeof(fromunix); 724 l = recvfrom(fx->s, line, MAXLINE, 0, 725 (struct sockaddr *)&fromunix, &len); 726 if (l > 0) { 727 line[l] = '\0'; 728 printline(LocalHostName, line, 0); 729 } else if (l < 0 && errno != EINTR) 730 logerror("recvfrom unix"); 731 } 732 } 733 } 734 if (fdsr) 735 free(fdsr); 736 } 737 738 static void 739 unmapped(struct sockaddr *sa) 740 { 741 struct sockaddr_in6 *sin6; 742 struct sockaddr_in sin4; 743 744 if (sa->sa_family != AF_INET6) 745 return; 746 if (sa->sa_len != sizeof(struct sockaddr_in6) || 747 sizeof(sin4) > sa->sa_len) 748 return; 749 sin6 = (struct sockaddr_in6 *)sa; 750 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 751 return; 752 753 memset(&sin4, 0, sizeof(sin4)); 754 sin4.sin_family = AF_INET; 755 sin4.sin_len = sizeof(struct sockaddr_in); 756 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 757 sizeof(sin4.sin_addr)); 758 sin4.sin_port = sin6->sin6_port; 759 760 memcpy(sa, &sin4, sin4.sin_len); 761 } 762 763 static void 764 usage(void) 765 { 766 767 fprintf(stderr, "%s\n%s\n%s\n%s\n", 768 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 769 " [-b bind_address] [-f config_file]", 770 " [-l [mode:]path] [-m mark_interval]", 771 " [-P pid_file] [-p log_socket]"); 772 exit(1); 773 } 774 775 /* 776 * Take a raw input line, decode the message, and print the message 777 * on the appropriate log files. 778 */ 779 static void 780 printline(const char *hname, char *msg, int flags) 781 { 782 char *p, *q; 783 long n; 784 int c, pri; 785 char line[MAXLINE + 1]; 786 787 /* test for special codes */ 788 p = msg; 789 pri = DEFUPRI; 790 if (*p == '<') { 791 errno = 0; 792 n = strtol(p + 1, &q, 10); 793 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 794 p = q + 1; 795 pri = n; 796 } 797 } 798 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 799 pri = DEFUPRI; 800 801 /* 802 * Don't allow users to log kernel messages. 803 * NOTE: since LOG_KERN == 0 this will also match 804 * messages with no facility specified. 805 */ 806 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 807 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 808 809 q = line; 810 811 while ((c = (unsigned char)*p++) != '\0' && 812 q < &line[sizeof(line) - 4]) { 813 if (mask_C1 && (c & 0x80) && c < 0xA0) { 814 c &= 0x7F; 815 *q++ = 'M'; 816 *q++ = '-'; 817 } 818 if (isascii(c) && iscntrl(c)) { 819 if (c == '\n') { 820 *q++ = ' '; 821 } else if (c == '\t') { 822 *q++ = '\t'; 823 } else { 824 *q++ = '^'; 825 *q++ = c ^ 0100; 826 } 827 } else { 828 *q++ = c; 829 } 830 } 831 *q = '\0'; 832 833 logmsg(pri, line, hname, flags); 834 } 835 836 /* 837 * Read /dev/klog while data are available, split into lines. 838 */ 839 static void 840 readklog(void) 841 { 842 char *p, *q, line[MAXLINE + 1]; 843 int len, i; 844 845 len = 0; 846 for (;;) { 847 i = read(fklog, line + len, MAXLINE - 1 - len); 848 if (i > 0) { 849 line[i + len] = '\0'; 850 } else { 851 if (i < 0 && errno != EINTR && errno != EAGAIN) { 852 logerror("klog"); 853 fklog = -1; 854 } 855 break; 856 } 857 858 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 859 *q = '\0'; 860 printsys(p); 861 } 862 len = strlen(p); 863 if (len >= MAXLINE - 1) { 864 printsys(p); 865 len = 0; 866 } 867 if (len > 0) 868 memmove(line, p, len + 1); 869 } 870 if (len > 0) 871 printsys(line); 872 } 873 874 /* 875 * Take a raw input line from /dev/klog, format similar to syslog(). 876 */ 877 static void 878 printsys(char *msg) 879 { 880 char *p, *q; 881 long n; 882 int flags, isprintf, pri; 883 884 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 885 p = msg; 886 pri = DEFSPRI; 887 isprintf = 1; 888 if (*p == '<') { 889 errno = 0; 890 n = strtol(p + 1, &q, 10); 891 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 892 p = q + 1; 893 pri = n; 894 isprintf = 0; 895 } 896 } 897 /* 898 * Kernel printf's and LOG_CONSOLE messages have been displayed 899 * on the console already. 900 */ 901 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 902 flags |= IGN_CONS; 903 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 904 pri = DEFSPRI; 905 logmsg(pri, p, LocalHostName, flags); 906 } 907 908 static time_t now; 909 910 /* 911 * Match a program or host name against a specification. 912 * Return a non-0 value if the message must be ignored 913 * based on the specification. 914 */ 915 static int 916 skip_message(const char *name, const char *spec, int checkcase) 917 { 918 const char *s; 919 char prev, next; 920 int exclude = 0; 921 /* Behaviour on explicit match */ 922 923 if (spec == NULL) 924 return 0; 925 switch (*spec) { 926 case '-': 927 exclude = 1; 928 /*FALLTHROUGH*/ 929 case '+': 930 spec++; 931 break; 932 default: 933 break; 934 } 935 if (checkcase) 936 s = strstr (spec, name); 937 else 938 s = strcasestr (spec, name); 939 940 if (s != NULL) { 941 prev = (s == spec ? ',' : *(s - 1)); 942 next = *(s + strlen (name)); 943 944 if (prev == ',' && (next == '\0' || next == ',')) 945 /* Explicit match: skip iff the spec is an 946 exclusive one. */ 947 return exclude; 948 } 949 950 /* No explicit match for this name: skip the message iff 951 the spec is an inclusive one. */ 952 return !exclude; 953 } 954 955 /* 956 * Log a message to the appropriate log files, users, etc. based on 957 * the priority. 958 */ 959 static void 960 logmsg(int pri, const char *msg, const char *from, int flags) 961 { 962 struct filed *f; 963 int i, fac, msglen, omask, prilev; 964 const char *timestamp; 965 char prog[NAME_MAX+1]; 966 char buf[MAXLINE+1]; 967 968 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 969 pri, flags, from, msg); 970 971 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 972 973 /* 974 * Check to see if msg looks non-standard. 975 */ 976 msglen = strlen(msg); 977 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 978 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 979 flags |= ADDDATE; 980 981 (void)time(&now); 982 if (flags & ADDDATE) { 983 timestamp = ctime(&now) + 4; 984 } else { 985 timestamp = msg; 986 msg += 16; 987 msglen -= 16; 988 } 989 990 /* skip leading blanks */ 991 while (isspace(*msg)) { 992 msg++; 993 msglen--; 994 } 995 996 /* extract facility and priority level */ 997 if (flags & MARK) 998 fac = LOG_NFACILITIES; 999 else 1000 fac = LOG_FAC(pri); 1001 1002 /* Check maximum facility number. */ 1003 if (fac > LOG_NFACILITIES) { 1004 (void)sigsetmask(omask); 1005 return; 1006 } 1007 1008 prilev = LOG_PRI(pri); 1009 1010 /* extract program name */ 1011 for (i = 0; i < NAME_MAX; i++) { 1012 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1013 msg[i] == '/' || isspace(msg[i])) 1014 break; 1015 prog[i] = msg[i]; 1016 } 1017 prog[i] = 0; 1018 1019 /* add kernel prefix for kernel messages */ 1020 if (flags & ISKERNEL) { 1021 snprintf(buf, sizeof(buf), "%s: %s", 1022 use_bootfile ? bootfile : "kernel", msg); 1023 msg = buf; 1024 msglen = strlen(buf); 1025 } 1026 1027 /* log the message to the particular outputs */ 1028 if (!Initialized) { 1029 f = &consfile; 1030 /* 1031 * Open in non-blocking mode to avoid hangs during open 1032 * and close(waiting for the port to drain). 1033 */ 1034 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1035 1036 if (f->f_file >= 0) { 1037 (void)strlcpy(f->f_lasttime, timestamp, 1038 sizeof(f->f_lasttime)); 1039 fprintlog(f, flags, msg); 1040 close(f->f_file); 1041 f->f_file = -1; 1042 } 1043 (void)sigsetmask(omask); 1044 return; 1045 } 1046 for (f = Files; f; f = f->f_next) { 1047 /* skip messages that are incorrect priority */ 1048 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1049 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1050 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1051 ) 1052 || f->f_pmask[fac] == INTERNAL_NOPRI) 1053 continue; 1054 1055 /* skip messages with the incorrect hostname */ 1056 if (skip_message(from, f->f_host, 0)) 1057 continue; 1058 1059 /* skip messages with the incorrect program name */ 1060 if (skip_message(prog, f->f_program, 1)) 1061 continue; 1062 1063 /* skip message to console if it has already been printed */ 1064 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1065 continue; 1066 1067 /* don't output marks to recently written files */ 1068 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1069 continue; 1070 1071 /* 1072 * suppress duplicate lines to this file 1073 */ 1074 if (no_compress - (f->f_type != F_PIPE) < 1 && 1075 (flags & MARK) == 0 && msglen == f->f_prevlen && 1076 !strcmp(msg, f->f_prevline) && 1077 !strcasecmp(from, f->f_prevhost)) { 1078 (void)strlcpy(f->f_lasttime, timestamp, 1079 sizeof(f->f_lasttime)); 1080 f->f_prevcount++; 1081 dprintf("msg repeated %d times, %ld sec of %d\n", 1082 f->f_prevcount, (long)(now - f->f_time), 1083 repeatinterval[f->f_repeatcount]); 1084 /* 1085 * If domark would have logged this by now, 1086 * flush it now (so we don't hold isolated messages), 1087 * but back off so we'll flush less often 1088 * in the future. 1089 */ 1090 if (now > REPEATTIME(f)) { 1091 fprintlog(f, flags, (char *)NULL); 1092 BACKOFF(f); 1093 } 1094 } else { 1095 /* new line, save it */ 1096 if (f->f_prevcount) 1097 fprintlog(f, 0, (char *)NULL); 1098 f->f_repeatcount = 0; 1099 f->f_prevpri = pri; 1100 (void)strlcpy(f->f_lasttime, timestamp, 1101 sizeof(f->f_lasttime)); 1102 (void)strlcpy(f->f_prevhost, from, 1103 sizeof(f->f_prevhost)); 1104 if (msglen < MAXSVLINE) { 1105 f->f_prevlen = msglen; 1106 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1107 fprintlog(f, flags, (char *)NULL); 1108 } else { 1109 f->f_prevline[0] = 0; 1110 f->f_prevlen = 0; 1111 fprintlog(f, flags, msg); 1112 } 1113 } 1114 } 1115 (void)sigsetmask(omask); 1116 } 1117 1118 static void 1119 dofsync(void) 1120 { 1121 struct filed *f; 1122 1123 for (f = Files; f; f = f->f_next) { 1124 if ((f->f_type == F_FILE) && 1125 (f->f_flags & FFLAG_NEEDSYNC)) { 1126 f->f_flags &= ~FFLAG_NEEDSYNC; 1127 (void)fsync(f->f_file); 1128 } 1129 } 1130 } 1131 1132 #define IOV_SIZE 7 1133 static void 1134 fprintlog(struct filed *f, int flags, const char *msg) 1135 { 1136 struct iovec iov[IOV_SIZE]; 1137 struct iovec *v; 1138 struct addrinfo *r; 1139 int i, l, lsent = 0; 1140 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1141 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1142 const char *msgret; 1143 1144 v = iov; 1145 if (f->f_type == F_WALL) { 1146 v->iov_base = greetings; 1147 /* The time displayed is not synchornized with the other log 1148 * destinations (like messages). Following fragment was using 1149 * ctime(&now), which was updating the time every 30 sec. 1150 * With f_lasttime, time is synchronized correctly. 1151 */ 1152 v->iov_len = snprintf(greetings, sizeof greetings, 1153 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1154 f->f_prevhost, f->f_lasttime); 1155 if (v->iov_len >= sizeof greetings) 1156 v->iov_len = sizeof greetings - 1; 1157 v++; 1158 v->iov_base = nul; 1159 v->iov_len = 0; 1160 v++; 1161 } else { 1162 v->iov_base = f->f_lasttime; 1163 v->iov_len = strlen(f->f_lasttime); 1164 v++; 1165 v->iov_base = space; 1166 v->iov_len = 1; 1167 v++; 1168 } 1169 1170 if (LogFacPri) { 1171 static char fp_buf[30]; /* Hollow laugh */ 1172 int fac = f->f_prevpri & LOG_FACMASK; 1173 int pri = LOG_PRI(f->f_prevpri); 1174 const char *f_s = NULL; 1175 char f_n[5]; /* Hollow laugh */ 1176 const char *p_s = NULL; 1177 char p_n[5]; /* Hollow laugh */ 1178 1179 if (LogFacPri > 1) { 1180 const CODE *c; 1181 1182 for (c = facilitynames; c->c_name; c++) { 1183 if (c->c_val == fac) { 1184 f_s = c->c_name; 1185 break; 1186 } 1187 } 1188 for (c = prioritynames; c->c_name; c++) { 1189 if (c->c_val == pri) { 1190 p_s = c->c_name; 1191 break; 1192 } 1193 } 1194 } 1195 if (!f_s) { 1196 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1197 f_s = f_n; 1198 } 1199 if (!p_s) { 1200 snprintf(p_n, sizeof p_n, "%d", pri); 1201 p_s = p_n; 1202 } 1203 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1204 v->iov_base = fp_buf; 1205 v->iov_len = strlen(fp_buf); 1206 } else { 1207 v->iov_base = nul; 1208 v->iov_len = 0; 1209 } 1210 v++; 1211 1212 v->iov_base = f->f_prevhost; 1213 v->iov_len = strlen(v->iov_base); 1214 v++; 1215 v->iov_base = space; 1216 v->iov_len = 1; 1217 v++; 1218 1219 if (msg) { 1220 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1221 if (wmsg == NULL) { 1222 logerror("strdup"); 1223 exit(1); 1224 } 1225 v->iov_base = wmsg; 1226 v->iov_len = strlen(msg); 1227 } else if (f->f_prevcount > 1) { 1228 v->iov_base = repbuf; 1229 v->iov_len = snprintf(repbuf, sizeof repbuf, 1230 "last message repeated %d times", f->f_prevcount); 1231 } else { 1232 v->iov_base = f->f_prevline; 1233 v->iov_len = f->f_prevlen; 1234 } 1235 v++; 1236 1237 dprintf("Logging to %s", TypeNames[f->f_type]); 1238 f->f_time = now; 1239 1240 switch (f->f_type) { 1241 int port; 1242 case F_UNUSED: 1243 dprintf("\n"); 1244 break; 1245 1246 case F_FORW: 1247 port = (int)ntohs(((struct sockaddr_in *) 1248 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1249 if (port != 514) { 1250 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1251 } else { 1252 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1253 } 1254 /* check for local vs remote messages */ 1255 if (strcasecmp(f->f_prevhost, LocalHostName)) 1256 l = snprintf(line, sizeof line - 1, 1257 "<%d>%.15s Forwarded from %s: %s", 1258 f->f_prevpri, (char *)iov[0].iov_base, 1259 f->f_prevhost, (char *)iov[5].iov_base); 1260 else 1261 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1262 f->f_prevpri, (char *)iov[0].iov_base, 1263 (char *)iov[5].iov_base); 1264 if (l < 0) 1265 l = 0; 1266 else if (l > MAXLINE) 1267 l = MAXLINE; 1268 1269 if (finet) { 1270 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1271 for (i = 0; i < *finet; i++) { 1272 #if 0 1273 /* 1274 * should we check AF first, or just 1275 * trial and error? FWD 1276 */ 1277 if (r->ai_family == 1278 address_family_of(finet[i+1])) 1279 #endif 1280 lsent = sendto(finet[i+1], line, l, 0, 1281 r->ai_addr, r->ai_addrlen); 1282 if (lsent == l) 1283 break; 1284 } 1285 if (lsent == l && !send_to_all) 1286 break; 1287 } 1288 dprintf("lsent/l: %d/%d\n", lsent, l); 1289 if (lsent != l) { 1290 int e = errno; 1291 logerror("sendto"); 1292 errno = e; 1293 switch (errno) { 1294 case ENOBUFS: 1295 case ENETDOWN: 1296 case ENETUNREACH: 1297 case EHOSTUNREACH: 1298 case EHOSTDOWN: 1299 case EADDRNOTAVAIL: 1300 break; 1301 /* case EBADF: */ 1302 /* case EACCES: */ 1303 /* case ENOTSOCK: */ 1304 /* case EFAULT: */ 1305 /* case EMSGSIZE: */ 1306 /* case EAGAIN: */ 1307 /* case ENOBUFS: */ 1308 /* case ECONNREFUSED: */ 1309 default: 1310 dprintf("removing entry: errno=%d\n", e); 1311 f->f_type = F_UNUSED; 1312 break; 1313 } 1314 } 1315 } 1316 break; 1317 1318 case F_FILE: 1319 dprintf(" %s\n", f->f_un.f_fname); 1320 v->iov_base = lf; 1321 v->iov_len = 1; 1322 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1323 /* 1324 * If writev(2) fails for potentially transient errors 1325 * like the filesystem being full, ignore it. 1326 * Otherwise remove this logfile from the list. 1327 */ 1328 if (errno != ENOSPC) { 1329 int e = errno; 1330 close_filed(f); 1331 errno = e; 1332 logerror(f->f_un.f_fname); 1333 } 1334 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1335 f->f_flags |= FFLAG_NEEDSYNC; 1336 needdofsync = 1; 1337 } 1338 break; 1339 1340 case F_PIPE: 1341 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1342 v->iov_base = lf; 1343 v->iov_len = 1; 1344 if (f->f_un.f_pipe.f_pid == 0) { 1345 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1346 &f->f_un.f_pipe.f_pid)) < 0) { 1347 f->f_type = F_UNUSED; 1348 logerror(f->f_un.f_pipe.f_pname); 1349 break; 1350 } 1351 } 1352 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1353 int e = errno; 1354 close_filed(f); 1355 if (f->f_un.f_pipe.f_pid > 0) 1356 deadq_enter(f->f_un.f_pipe.f_pid, 1357 f->f_un.f_pipe.f_pname); 1358 f->f_un.f_pipe.f_pid = 0; 1359 errno = e; 1360 logerror(f->f_un.f_pipe.f_pname); 1361 } 1362 break; 1363 1364 case F_CONSOLE: 1365 if (flags & IGN_CONS) { 1366 dprintf(" (ignored)\n"); 1367 break; 1368 } 1369 /* FALLTHROUGH */ 1370 1371 case F_TTY: 1372 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1373 v->iov_base = crlf; 1374 v->iov_len = 2; 1375 1376 errno = 0; /* ttymsg() only sometimes returns an errno */ 1377 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1378 f->f_type = F_UNUSED; 1379 logerror(msgret); 1380 } 1381 break; 1382 1383 case F_USERS: 1384 case F_WALL: 1385 dprintf("\n"); 1386 v->iov_base = crlf; 1387 v->iov_len = 2; 1388 wallmsg(f, iov, IOV_SIZE); 1389 break; 1390 } 1391 f->f_prevcount = 0; 1392 free(wmsg); 1393 } 1394 1395 /* 1396 * WALLMSG -- Write a message to the world at large 1397 * 1398 * Write the specified message to either the entire 1399 * world, or a list of approved users. 1400 */ 1401 static void 1402 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1403 { 1404 static int reenter; /* avoid calling ourselves */ 1405 struct utmpx *ut; 1406 int i; 1407 const char *p; 1408 1409 if (reenter++) 1410 return; 1411 setutxent(); 1412 /* NOSTRICT */ 1413 while ((ut = getutxent()) != NULL) { 1414 if (ut->ut_type != USER_PROCESS) 1415 continue; 1416 if (f->f_type == F_WALL) { 1417 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1418 TTYMSGTIME)) != NULL) { 1419 errno = 0; /* already in msg */ 1420 logerror(p); 1421 } 1422 continue; 1423 } 1424 /* should we send the message to this user? */ 1425 for (i = 0; i < MAXUNAMES; i++) { 1426 if (!f->f_un.f_uname[i][0]) 1427 break; 1428 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1429 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1430 TTYMSGTIME)) != NULL) { 1431 errno = 0; /* already in msg */ 1432 logerror(p); 1433 } 1434 break; 1435 } 1436 } 1437 } 1438 endutxent(); 1439 reenter = 0; 1440 } 1441 1442 /* 1443 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1444 */ 1445 static const char * 1446 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1447 { 1448 static char device[1024]; 1449 static char errbuf[1024]; 1450 struct stat sb; 1451 1452 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1453 1454 if (stat(device, &sb) < 0) { 1455 (void) snprintf(errbuf, sizeof(errbuf), 1456 "%s: %s", device, strerror(errno)); 1457 return (errbuf); 1458 } 1459 if ((sb.st_mode & S_IWGRP) == 0) 1460 /* Messages disabled. */ 1461 return (NULL); 1462 return ttymsg(iov, iovcnt, line, tmout); 1463 } 1464 1465 static void 1466 reapchild(int signo __unused) 1467 { 1468 int status; 1469 pid_t pid; 1470 struct filed *f; 1471 1472 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1473 if (!Initialized) 1474 /* Don't tell while we are initting. */ 1475 continue; 1476 1477 /* First, look if it's a process from the dead queue. */ 1478 if (deadq_remove(pid)) 1479 goto oncemore; 1480 1481 /* Now, look in list of active processes. */ 1482 for (f = Files; f; f = f->f_next) 1483 if (f->f_type == F_PIPE && 1484 f->f_un.f_pipe.f_pid == pid) { 1485 close_filed(f); 1486 f->f_un.f_pipe.f_pid = 0; 1487 log_deadchild(pid, status, 1488 f->f_un.f_pipe.f_pname); 1489 break; 1490 } 1491 oncemore: 1492 continue; 1493 } 1494 } 1495 1496 /* 1497 * Return a printable representation of a host address. 1498 */ 1499 static const char * 1500 cvthname(struct sockaddr *f) 1501 { 1502 int error, hl; 1503 sigset_t omask, nmask; 1504 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1505 1506 error = getnameinfo((struct sockaddr *)f, 1507 ((struct sockaddr *)f)->sa_len, 1508 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1509 dprintf("cvthname(%s)\n", ip); 1510 1511 if (error) { 1512 dprintf("Malformed from address %s\n", gai_strerror(error)); 1513 return ("???"); 1514 } 1515 if (!resolve) 1516 return (ip); 1517 1518 sigemptyset(&nmask); 1519 sigaddset(&nmask, SIGHUP); 1520 sigprocmask(SIG_BLOCK, &nmask, &omask); 1521 error = getnameinfo((struct sockaddr *)f, 1522 ((struct sockaddr *)f)->sa_len, 1523 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1524 sigprocmask(SIG_SETMASK, &omask, NULL); 1525 if (error) { 1526 dprintf("Host name for your address (%s) unknown\n", ip); 1527 return (ip); 1528 } 1529 hl = strlen(hname); 1530 if (hl > 0 && hname[hl-1] == '.') 1531 hname[--hl] = '\0'; 1532 trimdomain(hname, hl); 1533 return (hname); 1534 } 1535 1536 static void 1537 dodie(int signo) 1538 { 1539 1540 WantDie = signo; 1541 } 1542 1543 static void 1544 domark(int signo __unused) 1545 { 1546 1547 MarkSet = 1; 1548 } 1549 1550 /* 1551 * Print syslogd errors some place. 1552 */ 1553 static void 1554 logerror(const char *type) 1555 { 1556 char buf[512]; 1557 static int recursed = 0; 1558 1559 /* If there's an error while trying to log an error, give up. */ 1560 if (recursed) 1561 return; 1562 recursed++; 1563 if (errno) 1564 (void)snprintf(buf, 1565 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1566 else 1567 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1568 errno = 0; 1569 dprintf("%s\n", buf); 1570 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1571 recursed--; 1572 } 1573 1574 static void 1575 die(int signo) 1576 { 1577 struct filed *f; 1578 struct funix *fx; 1579 int was_initialized; 1580 char buf[100]; 1581 1582 was_initialized = Initialized; 1583 Initialized = 0; /* Don't log SIGCHLDs. */ 1584 for (f = Files; f != NULL; f = f->f_next) { 1585 /* flush any pending output */ 1586 if (f->f_prevcount) 1587 fprintlog(f, 0, (char *)NULL); 1588 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1589 close_filed(f); 1590 f->f_un.f_pipe.f_pid = 0; 1591 } 1592 } 1593 Initialized = was_initialized; 1594 if (signo) { 1595 dprintf("syslogd: exiting on signal %d\n", signo); 1596 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1597 errno = 0; 1598 logerror(buf); 1599 } 1600 STAILQ_FOREACH(fx, &funixes, next) 1601 (void)unlink(fx->name); 1602 pidfile_remove(pfh); 1603 1604 exit(1); 1605 } 1606 1607 static int 1608 configfiles(const struct dirent *dp) 1609 { 1610 const char *p; 1611 size_t ext_len; 1612 1613 if (dp->d_name[0] == '.') 1614 return (0); 1615 1616 ext_len = sizeof(include_ext) -1; 1617 1618 if (dp->d_namlen <= ext_len) 1619 return (0); 1620 1621 p = &dp->d_name[dp->d_namlen - ext_len]; 1622 if (strcmp(p, include_ext) != 0) 1623 return (0); 1624 1625 return (1); 1626 } 1627 1628 static void 1629 readconfigfile(FILE *cf, struct filed **nextp, int allow_includes) 1630 { 1631 FILE *cf2; 1632 struct filed *f; 1633 struct dirent **ent; 1634 char cline[LINE_MAX]; 1635 char host[MAXHOSTNAMELEN]; 1636 char prog[LINE_MAX]; 1637 char file[MAXPATHLEN]; 1638 char *p, *tmp; 1639 int i, nents; 1640 size_t include_len; 1641 1642 /* 1643 * Foreach line in the conf table, open that file. 1644 */ 1645 f = NULL; 1646 include_len = sizeof(include_str) -1; 1647 (void)strlcpy(host, "*", sizeof(host)); 1648 (void)strlcpy(prog, "*", sizeof(prog)); 1649 while (fgets(cline, sizeof(cline), cf) != NULL) { 1650 /* 1651 * check for end-of-section, comments, strip off trailing 1652 * spaces and newline character. #!prog is treated specially: 1653 * following lines apply only to that program. 1654 */ 1655 for (p = cline; isspace(*p); ++p) 1656 continue; 1657 if (*p == 0) 1658 continue; 1659 if (allow_includes && 1660 strncmp(p, include_str, include_len) == 0 && 1661 isspace(p[include_len])) { 1662 p += include_len; 1663 while (isspace(*p)) 1664 p++; 1665 tmp = p; 1666 while (*tmp != '\0' && !isspace(*tmp)) 1667 tmp++; 1668 *tmp = '\0'; 1669 dprintf("Trying to include files in '%s'\n", p); 1670 nents = scandir(p, &ent, configfiles, alphasort); 1671 if (nents == -1) { 1672 dprintf("Unable to open '%s': %s\n", p, 1673 strerror(errno)); 1674 continue; 1675 } 1676 for (i = 0; i < nents; i++) { 1677 if (snprintf(file, sizeof(file), "%s/%s", p, 1678 ent[i]->d_name) >= (int)sizeof(file)) { 1679 dprintf("ignoring path too long: " 1680 "'%s/%s'\n", p, ent[i]->d_name); 1681 free(ent[i]); 1682 continue; 1683 } 1684 free(ent[i]); 1685 cf2 = fopen(file, "r"); 1686 if (cf2 == NULL) 1687 continue; 1688 dprintf("reading %s\n", file); 1689 readconfigfile(cf2, nextp, 0); 1690 fclose(cf2); 1691 } 1692 free(ent); 1693 continue; 1694 } 1695 if (*p == '#') { 1696 p++; 1697 if (*p != '!' && *p != '+' && *p != '-') 1698 continue; 1699 } 1700 if (*p == '+' || *p == '-') { 1701 host[0] = *p++; 1702 while (isspace(*p)) 1703 p++; 1704 if ((!*p) || (*p == '*')) { 1705 (void)strlcpy(host, "*", sizeof(host)); 1706 continue; 1707 } 1708 if (*p == '@') 1709 p = LocalHostName; 1710 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1711 if (!isalnum(*p) && *p != '.' && *p != '-' 1712 && *p != ',' && *p != ':' && *p != '%') 1713 break; 1714 host[i] = *p++; 1715 } 1716 host[i] = '\0'; 1717 continue; 1718 } 1719 if (*p == '!') { 1720 p++; 1721 while (isspace(*p)) p++; 1722 if ((!*p) || (*p == '*')) { 1723 (void)strlcpy(prog, "*", sizeof(prog)); 1724 continue; 1725 } 1726 for (i = 0; i < LINE_MAX - 1; i++) { 1727 if (!isprint(p[i]) || isspace(p[i])) 1728 break; 1729 prog[i] = p[i]; 1730 } 1731 prog[i] = 0; 1732 continue; 1733 } 1734 for (p = cline + 1; *p != '\0'; p++) { 1735 if (*p != '#') 1736 continue; 1737 if (*(p - 1) == '\\') { 1738 strcpy(p - 1, p); 1739 p--; 1740 continue; 1741 } 1742 *p = '\0'; 1743 break; 1744 } 1745 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1746 cline[i] = '\0'; 1747 f = (struct filed *)calloc(1, sizeof(*f)); 1748 if (f == NULL) { 1749 logerror("calloc"); 1750 exit(1); 1751 } 1752 *nextp = f; 1753 nextp = &f->f_next; 1754 cfline(cline, f, prog, host); 1755 } 1756 } 1757 1758 /* 1759 * INIT -- Initialize syslogd from configuration table 1760 */ 1761 static void 1762 init(int signo) 1763 { 1764 int i; 1765 FILE *cf; 1766 struct filed *f, *next, **nextp; 1767 char *p; 1768 char oldLocalHostName[MAXHOSTNAMELEN]; 1769 char hostMsg[2*MAXHOSTNAMELEN+40]; 1770 char bootfileMsg[LINE_MAX]; 1771 1772 dprintf("init\n"); 1773 1774 /* 1775 * Load hostname (may have changed). 1776 */ 1777 if (signo != 0) 1778 (void)strlcpy(oldLocalHostName, LocalHostName, 1779 sizeof(oldLocalHostName)); 1780 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1781 err(EX_OSERR, "gethostname() failed"); 1782 if ((p = strchr(LocalHostName, '.')) != NULL) { 1783 *p++ = '\0'; 1784 LocalDomain = p; 1785 } else { 1786 LocalDomain = ""; 1787 } 1788 1789 /* 1790 * Load / reload timezone data (in case it changed). 1791 * 1792 * Just calling tzset() again does not work, the timezone code 1793 * caches the result. However, by setting the TZ variable, one 1794 * can defeat the caching and have the timezone code really 1795 * reload the timezone data. Respect any initial setting of 1796 * TZ, in case the system is configured specially. 1797 */ 1798 dprintf("loading timezone data via tzset()\n"); 1799 if (getenv("TZ")) { 1800 tzset(); 1801 } else { 1802 setenv("TZ", ":/etc/localtime", 1); 1803 tzset(); 1804 unsetenv("TZ"); 1805 } 1806 1807 /* 1808 * Close all open log files. 1809 */ 1810 Initialized = 0; 1811 for (f = Files; f != NULL; f = next) { 1812 /* flush any pending output */ 1813 if (f->f_prevcount) 1814 fprintlog(f, 0, (char *)NULL); 1815 1816 switch (f->f_type) { 1817 case F_FILE: 1818 case F_FORW: 1819 case F_CONSOLE: 1820 case F_TTY: 1821 close_filed(f); 1822 break; 1823 case F_PIPE: 1824 if (f->f_un.f_pipe.f_pid > 0) { 1825 close_filed(f); 1826 deadq_enter(f->f_un.f_pipe.f_pid, 1827 f->f_un.f_pipe.f_pname); 1828 } 1829 f->f_un.f_pipe.f_pid = 0; 1830 break; 1831 } 1832 next = f->f_next; 1833 if (f->f_program) free(f->f_program); 1834 if (f->f_host) free(f->f_host); 1835 free((char *)f); 1836 } 1837 Files = NULL; 1838 nextp = &Files; 1839 1840 /* open the configuration file */ 1841 if ((cf = fopen(ConfFile, "r")) == NULL) { 1842 dprintf("cannot open %s\n", ConfFile); 1843 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1844 if (*nextp == NULL) { 1845 logerror("calloc"); 1846 exit(1); 1847 } 1848 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1849 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1850 if ((*nextp)->f_next == NULL) { 1851 logerror("calloc"); 1852 exit(1); 1853 } 1854 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1855 Initialized = 1; 1856 return; 1857 } 1858 1859 readconfigfile(cf, &Files, 1); 1860 1861 /* close the configuration file */ 1862 (void)fclose(cf); 1863 1864 Initialized = 1; 1865 1866 if (Debug) { 1867 int port; 1868 for (f = Files; f; f = f->f_next) { 1869 for (i = 0; i <= LOG_NFACILITIES; i++) 1870 if (f->f_pmask[i] == INTERNAL_NOPRI) 1871 printf("X "); 1872 else 1873 printf("%d ", f->f_pmask[i]); 1874 printf("%s: ", TypeNames[f->f_type]); 1875 switch (f->f_type) { 1876 case F_FILE: 1877 printf("%s", f->f_un.f_fname); 1878 break; 1879 1880 case F_CONSOLE: 1881 case F_TTY: 1882 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1883 break; 1884 1885 case F_FORW: 1886 port = (int)ntohs(((struct sockaddr_in *) 1887 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1888 if (port != 514) { 1889 printf("%s:%d", 1890 f->f_un.f_forw.f_hname, port); 1891 } else { 1892 printf("%s", f->f_un.f_forw.f_hname); 1893 } 1894 break; 1895 1896 case F_PIPE: 1897 printf("%s", f->f_un.f_pipe.f_pname); 1898 break; 1899 1900 case F_USERS: 1901 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1902 printf("%s, ", f->f_un.f_uname[i]); 1903 break; 1904 } 1905 if (f->f_program) 1906 printf(" (%s)", f->f_program); 1907 printf("\n"); 1908 } 1909 } 1910 1911 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1912 dprintf("syslogd: restarted\n"); 1913 /* 1914 * Log a change in hostname, but only on a restart. 1915 */ 1916 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1917 (void)snprintf(hostMsg, sizeof(hostMsg), 1918 "syslogd: hostname changed, \"%s\" to \"%s\"", 1919 oldLocalHostName, LocalHostName); 1920 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1921 dprintf("%s\n", hostMsg); 1922 } 1923 /* 1924 * Log the kernel boot file if we aren't going to use it as 1925 * the prefix, and if this is *not* a restart. 1926 */ 1927 if (signo == 0 && !use_bootfile) { 1928 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1929 "syslogd: kernel boot file is %s", bootfile); 1930 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1931 dprintf("%s\n", bootfileMsg); 1932 } 1933 } 1934 1935 /* 1936 * Crack a configuration file line 1937 */ 1938 static void 1939 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1940 { 1941 struct addrinfo hints, *res; 1942 int error, i, pri, syncfile; 1943 const char *p, *q; 1944 char *bp; 1945 char buf[MAXLINE], ebuf[100]; 1946 1947 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1948 1949 errno = 0; /* keep strerror() stuff out of logerror messages */ 1950 1951 /* clear out file entry */ 1952 memset(f, 0, sizeof(*f)); 1953 for (i = 0; i <= LOG_NFACILITIES; i++) 1954 f->f_pmask[i] = INTERNAL_NOPRI; 1955 1956 /* save hostname if any */ 1957 if (host && *host == '*') 1958 host = NULL; 1959 if (host) { 1960 int hl; 1961 1962 f->f_host = strdup(host); 1963 if (f->f_host == NULL) { 1964 logerror("strdup"); 1965 exit(1); 1966 } 1967 hl = strlen(f->f_host); 1968 if (hl > 0 && f->f_host[hl-1] == '.') 1969 f->f_host[--hl] = '\0'; 1970 trimdomain(f->f_host, hl); 1971 } 1972 1973 /* save program name if any */ 1974 if (prog && *prog == '*') 1975 prog = NULL; 1976 if (prog) { 1977 f->f_program = strdup(prog); 1978 if (f->f_program == NULL) { 1979 logerror("strdup"); 1980 exit(1); 1981 } 1982 } 1983 1984 /* scan through the list of selectors */ 1985 for (p = line; *p && *p != '\t' && *p != ' ';) { 1986 int pri_done; 1987 int pri_cmp; 1988 int pri_invert; 1989 1990 /* find the end of this facility name list */ 1991 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1992 continue; 1993 1994 /* get the priority comparison */ 1995 pri_cmp = 0; 1996 pri_done = 0; 1997 pri_invert = 0; 1998 if (*q == '!') { 1999 pri_invert = 1; 2000 q++; 2001 } 2002 while (!pri_done) { 2003 switch (*q) { 2004 case '<': 2005 pri_cmp |= PRI_LT; 2006 q++; 2007 break; 2008 case '=': 2009 pri_cmp |= PRI_EQ; 2010 q++; 2011 break; 2012 case '>': 2013 pri_cmp |= PRI_GT; 2014 q++; 2015 break; 2016 default: 2017 pri_done++; 2018 break; 2019 } 2020 } 2021 2022 /* collect priority name */ 2023 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2024 *bp++ = *q++; 2025 *bp = '\0'; 2026 2027 /* skip cruft */ 2028 while (strchr(",;", *q)) 2029 q++; 2030 2031 /* decode priority name */ 2032 if (*buf == '*') { 2033 pri = LOG_PRIMASK; 2034 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2035 } else { 2036 /* Ignore trailing spaces. */ 2037 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2038 buf[i] = '\0'; 2039 2040 pri = decode(buf, prioritynames); 2041 if (pri < 0) { 2042 errno = 0; 2043 (void)snprintf(ebuf, sizeof ebuf, 2044 "unknown priority name \"%s\"", buf); 2045 logerror(ebuf); 2046 return; 2047 } 2048 } 2049 if (!pri_cmp) 2050 pri_cmp = (UniquePriority) 2051 ? (PRI_EQ) 2052 : (PRI_EQ | PRI_GT) 2053 ; 2054 if (pri_invert) 2055 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2056 2057 /* scan facilities */ 2058 while (*p && !strchr("\t.; ", *p)) { 2059 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2060 *bp++ = *p++; 2061 *bp = '\0'; 2062 2063 if (*buf == '*') { 2064 for (i = 0; i < LOG_NFACILITIES; i++) { 2065 f->f_pmask[i] = pri; 2066 f->f_pcmp[i] = pri_cmp; 2067 } 2068 } else { 2069 i = decode(buf, facilitynames); 2070 if (i < 0) { 2071 errno = 0; 2072 (void)snprintf(ebuf, sizeof ebuf, 2073 "unknown facility name \"%s\"", 2074 buf); 2075 logerror(ebuf); 2076 return; 2077 } 2078 f->f_pmask[i >> 3] = pri; 2079 f->f_pcmp[i >> 3] = pri_cmp; 2080 } 2081 while (*p == ',' || *p == ' ') 2082 p++; 2083 } 2084 2085 p = q; 2086 } 2087 2088 /* skip to action part */ 2089 while (*p == '\t' || *p == ' ') 2090 p++; 2091 2092 if (*p == '-') { 2093 syncfile = 0; 2094 p++; 2095 } else 2096 syncfile = 1; 2097 2098 switch (*p) { 2099 case '@': 2100 { 2101 char *tp; 2102 char endkey = ':'; 2103 /* 2104 * scan forward to see if there is a port defined. 2105 * so we can't use strlcpy.. 2106 */ 2107 i = sizeof(f->f_un.f_forw.f_hname); 2108 tp = f->f_un.f_forw.f_hname; 2109 p++; 2110 2111 /* 2112 * an ipv6 address should start with a '[' in that case 2113 * we should scan for a ']' 2114 */ 2115 if (*p == '[') { 2116 p++; 2117 endkey = ']'; 2118 } 2119 while (*p && (*p != endkey) && (i-- > 0)) { 2120 *tp++ = *p++; 2121 } 2122 if (endkey == ']' && *p == endkey) 2123 p++; 2124 *tp = '\0'; 2125 } 2126 /* See if we copied a domain and have a port */ 2127 if (*p == ':') 2128 p++; 2129 else 2130 p = NULL; 2131 2132 memset(&hints, 0, sizeof(hints)); 2133 hints.ai_family = family; 2134 hints.ai_socktype = SOCK_DGRAM; 2135 error = getaddrinfo(f->f_un.f_forw.f_hname, 2136 p ? p : "syslog", &hints, &res); 2137 if (error) { 2138 logerror(gai_strerror(error)); 2139 break; 2140 } 2141 f->f_un.f_forw.f_addr = res; 2142 f->f_type = F_FORW; 2143 break; 2144 2145 case '/': 2146 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2147 f->f_type = F_UNUSED; 2148 logerror(p); 2149 break; 2150 } 2151 if (syncfile) 2152 f->f_flags |= FFLAG_SYNC; 2153 if (isatty(f->f_file)) { 2154 if (strcmp(p, ctty) == 0) 2155 f->f_type = F_CONSOLE; 2156 else 2157 f->f_type = F_TTY; 2158 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2159 sizeof(f->f_un.f_fname)); 2160 } else { 2161 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2162 f->f_type = F_FILE; 2163 } 2164 break; 2165 2166 case '|': 2167 f->f_un.f_pipe.f_pid = 0; 2168 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2169 sizeof(f->f_un.f_pipe.f_pname)); 2170 f->f_type = F_PIPE; 2171 break; 2172 2173 case '*': 2174 f->f_type = F_WALL; 2175 break; 2176 2177 default: 2178 for (i = 0; i < MAXUNAMES && *p; i++) { 2179 for (q = p; *q && *q != ','; ) 2180 q++; 2181 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2182 if ((q - p) >= MAXLOGNAME) 2183 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2184 else 2185 f->f_un.f_uname[i][q - p] = '\0'; 2186 while (*q == ',' || *q == ' ') 2187 q++; 2188 p = q; 2189 } 2190 f->f_type = F_USERS; 2191 break; 2192 } 2193 } 2194 2195 2196 /* 2197 * Decode a symbolic name to a numeric value 2198 */ 2199 static int 2200 decode(const char *name, const CODE *codetab) 2201 { 2202 const CODE *c; 2203 char *p, buf[40]; 2204 2205 if (isdigit(*name)) 2206 return (atoi(name)); 2207 2208 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2209 if (isupper(*name)) 2210 *p = tolower(*name); 2211 else 2212 *p = *name; 2213 } 2214 *p = '\0'; 2215 for (c = codetab; c->c_name; c++) 2216 if (!strcmp(buf, c->c_name)) 2217 return (c->c_val); 2218 2219 return (-1); 2220 } 2221 2222 static void 2223 markit(void) 2224 { 2225 struct filed *f; 2226 dq_t q, next; 2227 2228 now = time((time_t *)NULL); 2229 MarkSeq += TIMERINTVL; 2230 if (MarkSeq >= MarkInterval) { 2231 logmsg(LOG_INFO, "-- MARK --", 2232 LocalHostName, ADDDATE|MARK); 2233 MarkSeq = 0; 2234 } 2235 2236 for (f = Files; f; f = f->f_next) { 2237 if (f->f_prevcount && now >= REPEATTIME(f)) { 2238 dprintf("flush %s: repeated %d times, %d sec.\n", 2239 TypeNames[f->f_type], f->f_prevcount, 2240 repeatinterval[f->f_repeatcount]); 2241 fprintlog(f, 0, (char *)NULL); 2242 BACKOFF(f); 2243 } 2244 } 2245 2246 /* Walk the dead queue, and see if we should signal somebody. */ 2247 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2248 next = TAILQ_NEXT(q, dq_entries); 2249 2250 switch (q->dq_timeout) { 2251 case 0: 2252 /* Already signalled once, try harder now. */ 2253 if (kill(q->dq_pid, SIGKILL) != 0) 2254 (void)deadq_remove(q->dq_pid); 2255 break; 2256 2257 case 1: 2258 /* 2259 * Timed out on dead queue, send terminate 2260 * signal. Note that we leave the removal 2261 * from the dead queue to reapchild(), which 2262 * will also log the event (unless the process 2263 * didn't even really exist, in case we simply 2264 * drop it from the dead queue). 2265 */ 2266 if (kill(q->dq_pid, SIGTERM) != 0) 2267 (void)deadq_remove(q->dq_pid); 2268 /* FALLTHROUGH */ 2269 2270 default: 2271 q->dq_timeout--; 2272 } 2273 } 2274 MarkSet = 0; 2275 (void)alarm(TIMERINTVL); 2276 } 2277 2278 /* 2279 * fork off and become a daemon, but wait for the child to come online 2280 * before returing to the parent, or we get disk thrashing at boot etc. 2281 * Set a timer so we don't hang forever if it wedges. 2282 */ 2283 static int 2284 waitdaemon(int nochdir, int noclose, int maxwait) 2285 { 2286 int fd; 2287 int status; 2288 pid_t pid, childpid; 2289 2290 switch (childpid = fork()) { 2291 case -1: 2292 return (-1); 2293 case 0: 2294 break; 2295 default: 2296 signal(SIGALRM, timedout); 2297 alarm(maxwait); 2298 while ((pid = wait3(&status, 0, NULL)) != -1) { 2299 if (WIFEXITED(status)) 2300 errx(1, "child pid %d exited with return code %d", 2301 pid, WEXITSTATUS(status)); 2302 if (WIFSIGNALED(status)) 2303 errx(1, "child pid %d exited on signal %d%s", 2304 pid, WTERMSIG(status), 2305 WCOREDUMP(status) ? " (core dumped)" : 2306 ""); 2307 if (pid == childpid) /* it's gone... */ 2308 break; 2309 } 2310 exit(0); 2311 } 2312 2313 if (setsid() == -1) 2314 return (-1); 2315 2316 if (!nochdir) 2317 (void)chdir("/"); 2318 2319 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2320 (void)dup2(fd, STDIN_FILENO); 2321 (void)dup2(fd, STDOUT_FILENO); 2322 (void)dup2(fd, STDERR_FILENO); 2323 if (fd > 2) 2324 (void)close (fd); 2325 } 2326 return (getppid()); 2327 } 2328 2329 /* 2330 * We get a SIGALRM from the child when it's running and finished doing it's 2331 * fsync()'s or O_SYNC writes for all the boot messages. 2332 * 2333 * We also get a signal from the kernel if the timer expires, so check to 2334 * see what happened. 2335 */ 2336 static void 2337 timedout(int sig __unused) 2338 { 2339 int left; 2340 left = alarm(0); 2341 signal(SIGALRM, SIG_DFL); 2342 if (left == 0) 2343 errx(1, "timed out waiting for child"); 2344 else 2345 _exit(0); 2346 } 2347 2348 /* 2349 * Add `s' to the list of allowable peer addresses to accept messages 2350 * from. 2351 * 2352 * `s' is a string in the form: 2353 * 2354 * [*]domainname[:{servicename|portnumber|*}] 2355 * 2356 * or 2357 * 2358 * netaddr/maskbits[:{servicename|portnumber|*}] 2359 * 2360 * Returns -1 on error, 0 if the argument was valid. 2361 */ 2362 static int 2363 allowaddr(char *s) 2364 { 2365 char *cp1, *cp2; 2366 struct allowedpeer ap; 2367 struct servent *se; 2368 int masklen = -1; 2369 struct addrinfo hints, *res; 2370 struct in_addr *addrp, *maskp; 2371 #ifdef INET6 2372 int i; 2373 u_int32_t *addr6p, *mask6p; 2374 #endif 2375 char ip[NI_MAXHOST]; 2376 2377 #ifdef INET6 2378 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2379 #endif 2380 cp1 = s; 2381 if ((cp1 = strrchr(cp1, ':'))) { 2382 /* service/port provided */ 2383 *cp1++ = '\0'; 2384 if (strlen(cp1) == 1 && *cp1 == '*') 2385 /* any port allowed */ 2386 ap.port = 0; 2387 else if ((se = getservbyname(cp1, "udp"))) { 2388 ap.port = ntohs(se->s_port); 2389 } else { 2390 ap.port = strtol(cp1, &cp2, 0); 2391 if (*cp2 != '\0') 2392 return (-1); /* port not numeric */ 2393 } 2394 } else { 2395 if ((se = getservbyname("syslog", "udp"))) 2396 ap.port = ntohs(se->s_port); 2397 else 2398 /* sanity, should not happen */ 2399 ap.port = 514; 2400 } 2401 2402 if ((cp1 = strchr(s, '/')) != NULL && 2403 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2404 *cp1 = '\0'; 2405 if ((masklen = atoi(cp1 + 1)) < 0) 2406 return (-1); 2407 } 2408 #ifdef INET6 2409 if (*s == '[') { 2410 cp2 = s + strlen(s) - 1; 2411 if (*cp2 == ']') { 2412 ++s; 2413 *cp2 = '\0'; 2414 } else { 2415 cp2 = NULL; 2416 } 2417 } else { 2418 cp2 = NULL; 2419 } 2420 #endif 2421 memset(&hints, 0, sizeof(hints)); 2422 hints.ai_family = PF_UNSPEC; 2423 hints.ai_socktype = SOCK_DGRAM; 2424 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2425 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2426 ap.isnumeric = 1; 2427 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2428 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2429 ap.a_mask.ss_family = res->ai_family; 2430 if (res->ai_family == AF_INET) { 2431 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2432 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2433 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2434 if (masklen < 0) { 2435 /* use default netmask */ 2436 if (IN_CLASSA(ntohl(addrp->s_addr))) 2437 maskp->s_addr = htonl(IN_CLASSA_NET); 2438 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2439 maskp->s_addr = htonl(IN_CLASSB_NET); 2440 else 2441 maskp->s_addr = htonl(IN_CLASSC_NET); 2442 } else if (masklen <= 32) { 2443 /* convert masklen to netmask */ 2444 if (masklen == 0) 2445 maskp->s_addr = 0; 2446 else 2447 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2448 } else { 2449 freeaddrinfo(res); 2450 return (-1); 2451 } 2452 /* Lose any host bits in the network number. */ 2453 addrp->s_addr &= maskp->s_addr; 2454 } 2455 #ifdef INET6 2456 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2457 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2458 if (masklen < 0) 2459 masklen = 128; 2460 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2461 /* convert masklen to netmask */ 2462 while (masklen > 0) { 2463 if (masklen < 32) { 2464 *mask6p = htonl(~(0xffffffff >> masklen)); 2465 break; 2466 } 2467 *mask6p++ = 0xffffffff; 2468 masklen -= 32; 2469 } 2470 /* Lose any host bits in the network number. */ 2471 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2472 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2473 for (i = 0; i < 4; i++) 2474 addr6p[i] &= mask6p[i]; 2475 } 2476 #endif 2477 else { 2478 freeaddrinfo(res); 2479 return (-1); 2480 } 2481 freeaddrinfo(res); 2482 } else { 2483 /* arg `s' is domain name */ 2484 ap.isnumeric = 0; 2485 ap.a_name = s; 2486 if (cp1) 2487 *cp1 = '/'; 2488 #ifdef INET6 2489 if (cp2) { 2490 *cp2 = ']'; 2491 --s; 2492 } 2493 #endif 2494 } 2495 2496 if (Debug) { 2497 printf("allowaddr: rule %d: ", NumAllowed); 2498 if (ap.isnumeric) { 2499 printf("numeric, "); 2500 getnameinfo((struct sockaddr *)&ap.a_addr, 2501 ((struct sockaddr *)&ap.a_addr)->sa_len, 2502 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2503 printf("addr = %s, ", ip); 2504 getnameinfo((struct sockaddr *)&ap.a_mask, 2505 ((struct sockaddr *)&ap.a_mask)->sa_len, 2506 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2507 printf("mask = %s; ", ip); 2508 } else { 2509 printf("domainname = %s; ", ap.a_name); 2510 } 2511 printf("port = %d\n", ap.port); 2512 } 2513 2514 if ((AllowedPeers = realloc(AllowedPeers, 2515 ++NumAllowed * sizeof(struct allowedpeer))) 2516 == NULL) { 2517 logerror("realloc"); 2518 exit(1); 2519 } 2520 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2521 return (0); 2522 } 2523 2524 /* 2525 * Validate that the remote peer has permission to log to us. 2526 */ 2527 static int 2528 validate(struct sockaddr *sa, const char *hname) 2529 { 2530 int i; 2531 size_t l1, l2; 2532 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2533 struct allowedpeer *ap; 2534 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2535 #ifdef INET6 2536 int j, reject; 2537 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2538 #endif 2539 struct addrinfo hints, *res; 2540 u_short sport; 2541 2542 if (NumAllowed == 0) 2543 /* traditional behaviour, allow everything */ 2544 return (1); 2545 2546 (void)strlcpy(name, hname, sizeof(name)); 2547 memset(&hints, 0, sizeof(hints)); 2548 hints.ai_family = PF_UNSPEC; 2549 hints.ai_socktype = SOCK_DGRAM; 2550 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2551 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2552 freeaddrinfo(res); 2553 else if (strchr(name, '.') == NULL) { 2554 strlcat(name, ".", sizeof name); 2555 strlcat(name, LocalDomain, sizeof name); 2556 } 2557 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2558 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2559 return (0); /* for safety, should not occur */ 2560 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2561 ip, port, name); 2562 sport = atoi(port); 2563 2564 /* now, walk down the list */ 2565 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2566 if (ap->port != 0 && ap->port != sport) { 2567 dprintf("rejected in rule %d due to port mismatch.\n", i); 2568 continue; 2569 } 2570 2571 if (ap->isnumeric) { 2572 if (ap->a_addr.ss_family != sa->sa_family) { 2573 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2574 continue; 2575 } 2576 if (ap->a_addr.ss_family == AF_INET) { 2577 sin4 = (struct sockaddr_in *)sa; 2578 a4p = (struct sockaddr_in *)&ap->a_addr; 2579 m4p = (struct sockaddr_in *)&ap->a_mask; 2580 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2581 != a4p->sin_addr.s_addr) { 2582 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2583 continue; 2584 } 2585 } 2586 #ifdef INET6 2587 else if (ap->a_addr.ss_family == AF_INET6) { 2588 sin6 = (struct sockaddr_in6 *)sa; 2589 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2590 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2591 if (a6p->sin6_scope_id != 0 && 2592 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2593 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2594 continue; 2595 } 2596 reject = 0; 2597 for (j = 0; j < 16; j += 4) { 2598 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2599 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2600 ++reject; 2601 break; 2602 } 2603 } 2604 if (reject) { 2605 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2606 continue; 2607 } 2608 } 2609 #endif 2610 else 2611 continue; 2612 } else { 2613 cp = ap->a_name; 2614 l1 = strlen(name); 2615 if (*cp == '*') { 2616 /* allow wildmatch */ 2617 cp++; 2618 l2 = strlen(cp); 2619 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2620 dprintf("rejected in rule %d due to name mismatch.\n", i); 2621 continue; 2622 } 2623 } else { 2624 /* exact match */ 2625 l2 = strlen(cp); 2626 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2627 dprintf("rejected in rule %d due to name mismatch.\n", i); 2628 continue; 2629 } 2630 } 2631 } 2632 dprintf("accepted in rule %d.\n", i); 2633 return (1); /* hooray! */ 2634 } 2635 return (0); 2636 } 2637 2638 /* 2639 * Fairly similar to popen(3), but returns an open descriptor, as 2640 * opposed to a FILE *. 2641 */ 2642 static int 2643 p_open(const char *prog, pid_t *rpid) 2644 { 2645 int pfd[2], nulldesc; 2646 pid_t pid; 2647 sigset_t omask, mask; 2648 char *argv[4]; /* sh -c cmd NULL */ 2649 char errmsg[200]; 2650 2651 if (pipe(pfd) == -1) 2652 return (-1); 2653 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2654 /* we are royally screwed anyway */ 2655 return (-1); 2656 2657 sigemptyset(&mask); 2658 sigaddset(&mask, SIGALRM); 2659 sigaddset(&mask, SIGHUP); 2660 sigprocmask(SIG_BLOCK, &mask, &omask); 2661 switch ((pid = fork())) { 2662 case -1: 2663 sigprocmask(SIG_SETMASK, &omask, 0); 2664 close(nulldesc); 2665 return (-1); 2666 2667 case 0: 2668 argv[0] = strdup("sh"); 2669 argv[1] = strdup("-c"); 2670 argv[2] = strdup(prog); 2671 argv[3] = NULL; 2672 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2673 logerror("strdup"); 2674 exit(1); 2675 } 2676 2677 alarm(0); 2678 (void)setsid(); /* Avoid catching SIGHUPs. */ 2679 2680 /* 2681 * Throw away pending signals, and reset signal 2682 * behaviour to standard values. 2683 */ 2684 signal(SIGALRM, SIG_IGN); 2685 signal(SIGHUP, SIG_IGN); 2686 sigprocmask(SIG_SETMASK, &omask, 0); 2687 signal(SIGPIPE, SIG_DFL); 2688 signal(SIGQUIT, SIG_DFL); 2689 signal(SIGALRM, SIG_DFL); 2690 signal(SIGHUP, SIG_DFL); 2691 2692 dup2(pfd[0], STDIN_FILENO); 2693 dup2(nulldesc, STDOUT_FILENO); 2694 dup2(nulldesc, STDERR_FILENO); 2695 closefrom(3); 2696 2697 (void)execvp(_PATH_BSHELL, argv); 2698 _exit(255); 2699 } 2700 2701 sigprocmask(SIG_SETMASK, &omask, 0); 2702 close(nulldesc); 2703 close(pfd[0]); 2704 /* 2705 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2706 * supposed to get an EWOULDBLOCK on writev(2), which is 2707 * caught by the logic above anyway, which will in turn close 2708 * the pipe, and fork a new logging subprocess if necessary. 2709 * The stale subprocess will be killed some time later unless 2710 * it terminated itself due to closing its input pipe (so we 2711 * get rid of really dead puppies). 2712 */ 2713 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2714 /* This is bad. */ 2715 (void)snprintf(errmsg, sizeof errmsg, 2716 "Warning: cannot change pipe to PID %d to " 2717 "non-blocking behaviour.", 2718 (int)pid); 2719 logerror(errmsg); 2720 } 2721 *rpid = pid; 2722 return (pfd[1]); 2723 } 2724 2725 static void 2726 deadq_enter(pid_t pid, const char *name) 2727 { 2728 dq_t p; 2729 int status; 2730 2731 /* 2732 * Be paranoid, if we can't signal the process, don't enter it 2733 * into the dead queue (perhaps it's already dead). If possible, 2734 * we try to fetch and log the child's status. 2735 */ 2736 if (kill(pid, 0) != 0) { 2737 if (waitpid(pid, &status, WNOHANG) > 0) 2738 log_deadchild(pid, status, name); 2739 return; 2740 } 2741 2742 p = malloc(sizeof(struct deadq_entry)); 2743 if (p == NULL) { 2744 logerror("malloc"); 2745 exit(1); 2746 } 2747 2748 p->dq_pid = pid; 2749 p->dq_timeout = DQ_TIMO_INIT; 2750 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2751 } 2752 2753 static int 2754 deadq_remove(pid_t pid) 2755 { 2756 dq_t q; 2757 2758 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2759 if (q->dq_pid == pid) { 2760 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2761 free(q); 2762 return (1); 2763 } 2764 } 2765 2766 return (0); 2767 } 2768 2769 static void 2770 log_deadchild(pid_t pid, int status, const char *name) 2771 { 2772 int code; 2773 char buf[256]; 2774 const char *reason; 2775 2776 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2777 if (WIFSIGNALED(status)) { 2778 reason = "due to signal"; 2779 code = WTERMSIG(status); 2780 } else { 2781 reason = "with status"; 2782 code = WEXITSTATUS(status); 2783 if (code == 0) 2784 return; 2785 } 2786 (void)snprintf(buf, sizeof buf, 2787 "Logging subprocess %d (%s) exited %s %d.", 2788 pid, name, reason, code); 2789 logerror(buf); 2790 } 2791 2792 static int * 2793 socksetup(int af, char *bindhostname) 2794 { 2795 struct addrinfo hints, *res, *r; 2796 const char *bindservice; 2797 char *cp; 2798 int error, maxs, *s, *socks; 2799 2800 /* 2801 * We have to handle this case for backwards compatibility: 2802 * If there are two (or more) colons but no '[' and ']', 2803 * assume this is an inet6 address without a service. 2804 */ 2805 bindservice = "syslog"; 2806 if (bindhostname != NULL) { 2807 #ifdef INET6 2808 if (*bindhostname == '[' && 2809 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2810 ++bindhostname; 2811 *cp = '\0'; 2812 if (cp[1] == ':' && cp[2] != '\0') 2813 bindservice = cp + 2; 2814 } else { 2815 #endif 2816 cp = strchr(bindhostname, ':'); 2817 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2818 *cp = '\0'; 2819 if (cp[1] != '\0') 2820 bindservice = cp + 1; 2821 if (cp == bindhostname) 2822 bindhostname = NULL; 2823 } 2824 #ifdef INET6 2825 } 2826 #endif 2827 } 2828 2829 memset(&hints, 0, sizeof(hints)); 2830 hints.ai_flags = AI_PASSIVE; 2831 hints.ai_family = af; 2832 hints.ai_socktype = SOCK_DGRAM; 2833 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2834 if (error) { 2835 logerror(gai_strerror(error)); 2836 errno = 0; 2837 die(0); 2838 } 2839 2840 /* Count max number of sockets we may open */ 2841 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2842 socks = malloc((maxs+1) * sizeof(int)); 2843 if (socks == NULL) { 2844 logerror("couldn't allocate memory for sockets"); 2845 die(0); 2846 } 2847 2848 *socks = 0; /* num of sockets counter at start of array */ 2849 s = socks + 1; 2850 for (r = res; r; r = r->ai_next) { 2851 int on = 1; 2852 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2853 if (*s < 0) { 2854 logerror("socket"); 2855 continue; 2856 } 2857 #ifdef INET6 2858 if (r->ai_family == AF_INET6) { 2859 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2860 (char *)&on, sizeof (on)) < 0) { 2861 logerror("setsockopt"); 2862 close(*s); 2863 continue; 2864 } 2865 } 2866 #endif 2867 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2868 (char *)&on, sizeof (on)) < 0) { 2869 logerror("setsockopt"); 2870 close(*s); 2871 continue; 2872 } 2873 /* 2874 * RFC 3164 recommends that client side message 2875 * should come from the privileged syslogd port. 2876 * 2877 * If the system administrator choose not to obey 2878 * this, we can skip the bind() step so that the 2879 * system will choose a port for us. 2880 */ 2881 if (!NoBind) { 2882 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2883 logerror("bind"); 2884 close(*s); 2885 continue; 2886 } 2887 2888 if (!SecureMode) 2889 increase_rcvbuf(*s); 2890 } 2891 2892 (*socks)++; 2893 dprintf("socksetup: new socket fd is %d\n", *s); 2894 s++; 2895 } 2896 2897 if (*socks == 0) { 2898 free(socks); 2899 if (Debug) 2900 return (NULL); 2901 else 2902 die(0); 2903 } 2904 if (res) 2905 freeaddrinfo(res); 2906 2907 return (socks); 2908 } 2909 2910 static void 2911 increase_rcvbuf(int fd) 2912 { 2913 socklen_t len, slen; 2914 2915 slen = sizeof(len); 2916 2917 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2918 if (len < RCVBUF_MINSIZE) { 2919 len = RCVBUF_MINSIZE; 2920 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2921 } 2922 } 2923 } 2924