syslogd.c revision 289949
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 31static 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 38static 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: stable/10/usr.sbin/syslogd/syslogd.c 289949 2015-10-25 22:17:43Z ngie $"); 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#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 <err.h> 99#include <errno.h> 100#include <fcntl.h> 101#include <libutil.h> 102#include <limits.h> 103#include <paths.h> 104#include <signal.h> 105#include <stdio.h> 106#include <stdlib.h> 107#include <string.h> 108#include <sysexits.h> 109#include <unistd.h> 110#include <utmpx.h> 111 112#include "pathnames.h" 113#include "ttymsg.h" 114 115#define SYSLOG_NAMES 116#include <sys/syslog.h> 117 118const char *ConfFile = _PATH_LOGCONF; 119const char *PidFile = _PATH_LOGPID; 120const char ctty[] = _PATH_CONSOLE; 121 122#define dprintf if (Debug) printf 123 124#define MAXUNAMES 20 /* maximum number of user names */ 125 126/* 127 * Unix sockets. 128 * We have two default sockets, one with 666 permissions, 129 * and one for privileged programs. 130 */ 131struct funix { 132 int s; 133 const char *name; 134 mode_t mode; 135 STAILQ_ENTRY(funix) next; 136}; 137struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 138 { NULL } }; 139struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 140 { &funix_secure } }; 141 142STAILQ_HEAD(, funix) funixes = { &funix_default, 143 &(funix_secure.next.stqe_next) }; 144 145/* 146 * Flags to logmsg(). 147 */ 148 149#define IGN_CONS 0x001 /* don't print on console */ 150#define SYNC_FILE 0x002 /* do fsync on file after printing */ 151#define ADDDATE 0x004 /* add a date to the message */ 152#define MARK 0x008 /* this message is a mark */ 153#define ISKERNEL 0x010 /* kernel generated message */ 154 155/* 156 * This structure represents the files that will have log 157 * copies printed. 158 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 159 * or if f_type if F_PIPE and f_pid > 0. 160 */ 161 162struct filed { 163 struct filed *f_next; /* next in linked list */ 164 short f_type; /* entry type, see below */ 165 short f_file; /* file descriptor */ 166 time_t f_time; /* time this was last written */ 167 char *f_host; /* host from which to recd. */ 168 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 169 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 170#define PRI_LT 0x1 171#define PRI_EQ 0x2 172#define PRI_GT 0x4 173 char *f_program; /* program this applies to */ 174 union { 175 char f_uname[MAXUNAMES][MAXLOGNAME]; 176 struct { 177 char f_hname[MAXHOSTNAMELEN]; 178 struct addrinfo *f_addr; 179 180 } f_forw; /* forwarding address */ 181 char f_fname[MAXPATHLEN]; 182 struct { 183 char f_pname[MAXPATHLEN]; 184 pid_t f_pid; 185 } f_pipe; 186 } f_un; 187 char f_prevline[MAXSVLINE]; /* last message logged */ 188 char f_lasttime[16]; /* time of last occurrence */ 189 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 190 int f_prevpri; /* pri of f_prevline */ 191 int f_prevlen; /* length of f_prevline */ 192 int f_prevcount; /* repetition cnt of prevline */ 193 u_int f_repeatcount; /* number of "repeated" msgs */ 194 int f_flags; /* file-specific flags */ 195#define FFLAG_SYNC 0x01 196#define FFLAG_NEEDSYNC 0x02 197}; 198 199/* 200 * Queue of about-to-be dead processes we should watch out for. 201 */ 202 203TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 204struct stailhead *deadq_headp; 205 206struct deadq_entry { 207 pid_t dq_pid; 208 int dq_timeout; 209 TAILQ_ENTRY(deadq_entry) dq_entries; 210}; 211 212/* 213 * The timeout to apply to processes waiting on the dead queue. Unit 214 * of measure is `mark intervals', i.e. 20 minutes by default. 215 * Processes on the dead queue will be terminated after that time. 216 */ 217 218#define DQ_TIMO_INIT 2 219 220typedef struct deadq_entry *dq_t; 221 222 223/* 224 * Struct to hold records of network addresses that are allowed to log 225 * to us. 226 */ 227struct allowedpeer { 228 int isnumeric; 229 u_short port; 230 union { 231 struct { 232 struct sockaddr_storage addr; 233 struct sockaddr_storage mask; 234 } numeric; 235 char *name; 236 } u; 237#define a_addr u.numeric.addr 238#define a_mask u.numeric.mask 239#define a_name u.name 240}; 241 242 243/* 244 * Intervals at which we flush out "message repeated" messages, 245 * in seconds after previous message is logged. After each flush, 246 * we move to the next interval until we reach the largest. 247 */ 248int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 249#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 250#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 251#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 252 (f)->f_repeatcount = MAXREPEAT; \ 253 } 254 255/* values for f_type */ 256#define F_UNUSED 0 /* unused entry */ 257#define F_FILE 1 /* regular file */ 258#define F_TTY 2 /* terminal */ 259#define F_CONSOLE 3 /* console terminal */ 260#define F_FORW 4 /* remote machine */ 261#define F_USERS 5 /* list of users */ 262#define F_WALL 6 /* everyone logged on */ 263#define F_PIPE 7 /* pipe to program */ 264 265const char *TypeNames[8] = { 266 "UNUSED", "FILE", "TTY", "CONSOLE", 267 "FORW", "USERS", "WALL", "PIPE" 268}; 269 270static struct filed *Files; /* Log files that we write to */ 271static struct filed consfile; /* Console */ 272 273static int Debug; /* debug flag */ 274static int resolve = 1; /* resolve hostname */ 275static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 276static const char *LocalDomain; /* our local domain name */ 277static int *finet; /* Internet datagram socket */ 278static int fklog = -1; /* /dev/klog */ 279static int Initialized; /* set when we have initialized ourselves */ 280static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 281static int MarkSeq; /* mark sequence number */ 282static int NoBind; /* don't bind() as suggested by RFC 3164 */ 283static int SecureMode; /* when true, receive only unix domain socks */ 284#ifdef INET6 285static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 286#else 287static int family = PF_INET; /* protocol family (IPv4 only) */ 288#endif 289static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 290static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 291static int use_bootfile; /* log entire bootfile for every kern msg */ 292static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 293static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 294 295static char bootfile[MAXLINE+1]; /* booted kernel file */ 296 297struct allowedpeer *AllowedPeers; /* List of allowed peers */ 298static int NumAllowed; /* Number of entries in AllowedPeers */ 299static int RemoteAddDate; /* Always set the date on remote messages */ 300 301static int UniquePriority; /* Only log specified priority? */ 302static int LogFacPri; /* Put facility and priority in log message: */ 303 /* 0=no, 1=numeric, 2=names */ 304static int KeepKernFac; /* Keep remotely logged kernel facility */ 305static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 306static struct pidfh *pfh; 307 308volatile sig_atomic_t MarkSet, WantDie; 309 310static int allowaddr(char *); 311static void cfline(const char *, struct filed *, 312 const char *, const char *); 313static const char *cvthname(struct sockaddr *); 314static void deadq_enter(pid_t, const char *); 315static int deadq_remove(pid_t); 316static int decode(const char *, const CODE *); 317static void die(int); 318static void dodie(int); 319static void dofsync(void); 320static void domark(int); 321static void fprintlog(struct filed *, int, const char *); 322static int *socksetup(int, char *); 323static void init(int); 324static void logerror(const char *); 325static void logmsg(int, const char *, const char *, int); 326static void log_deadchild(pid_t, int, const char *); 327static void markit(void); 328static int skip_message(const char *, const char *, int); 329static void printline(const char *, char *, int); 330static void printsys(char *); 331static int p_open(const char *, pid_t *); 332static void readklog(void); 333static void reapchild(int); 334static void usage(void); 335static int validate(struct sockaddr *, const char *); 336static void unmapped(struct sockaddr *); 337static void wallmsg(struct filed *, struct iovec *, const int iovlen); 338static int waitdaemon(int, int, int); 339static void timedout(int); 340static void increase_rcvbuf(int); 341 342static void 343close_filed(struct filed *f) 344{ 345 346 if (f == NULL || f->f_file == -1) 347 return; 348 349 (void)close(f->f_file); 350 f->f_file = -1; 351 f->f_type = F_UNUSED; 352} 353 354int 355main(int argc, char *argv[]) 356{ 357 int ch, i, fdsrmax = 0, l; 358 struct sockaddr_un sunx, fromunix; 359 struct sockaddr_storage frominet; 360 fd_set *fdsr = NULL; 361 char line[MAXLINE + 1]; 362 char *bindhostname; 363 const char *hname; 364 struct timeval tv, *tvp; 365 struct sigaction sact; 366 struct funix *fx, *fx1; 367 sigset_t mask; 368 pid_t ppid = 1, spid; 369 socklen_t len; 370 371 if (madvise(NULL, 0, MADV_PROTECT) != 0) 372 dprintf("madvise() failed: %s\n", strerror(errno)); 373 374 bindhostname = NULL; 375 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:kl:m:nNop:P:sS:Tuv")) 376 != -1) 377 switch (ch) { 378 case '4': 379 family = PF_INET; 380 break; 381#ifdef INET6 382 case '6': 383 family = PF_INET6; 384 break; 385#endif 386 case '8': 387 mask_C1 = 0; 388 break; 389 case 'A': 390 send_to_all++; 391 break; 392 case 'a': /* allow specific network addresses only */ 393 if (allowaddr(optarg) == -1) 394 usage(); 395 break; 396 case 'b': 397 bindhostname = optarg; 398 break; 399 case 'c': 400 no_compress++; 401 break; 402 case 'C': 403 logflags |= O_CREAT; 404 break; 405 case 'd': /* debug */ 406 Debug++; 407 break; 408 case 'f': /* configuration file */ 409 ConfFile = optarg; 410 break; 411 case 'k': /* keep remote kern fac */ 412 KeepKernFac = 1; 413 break; 414 case 'l': 415 { 416 long perml; 417 mode_t mode; 418 char *name, *ep; 419 420 if (optarg[0] == '/') { 421 mode = DEFFILEMODE; 422 name = optarg; 423 } else if ((name = strchr(optarg, ':')) != NULL) { 424 *name++ = '\0'; 425 if (name[0] != '/') 426 errx(1, "socket name must be absolute " 427 "path"); 428 if (isdigit(*optarg)) { 429 perml = strtol(optarg, &ep, 8); 430 if (*ep || perml < 0 || 431 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 432 errx(1, "invalid mode %s, exiting", 433 optarg); 434 mode = (mode_t )perml; 435 } else 436 errx(1, "invalid mode %s, exiting", 437 optarg); 438 } else /* doesn't begin with '/', and no ':' */ 439 errx(1, "can't parse path %s", optarg); 440 441 if (strlen(name) >= sizeof(sunx.sun_path)) 442 errx(1, "%s path too long, exiting", name); 443 if ((fx = malloc(sizeof(struct funix))) == NULL) 444 errx(1, "malloc failed"); 445 fx->s = -1; 446 fx->name = name; 447 fx->mode = mode; 448 STAILQ_INSERT_TAIL(&funixes, fx, next); 449 break; 450 } 451 case 'm': /* mark interval */ 452 MarkInterval = atoi(optarg) * 60; 453 break; 454 case 'N': 455 NoBind = 1; 456 SecureMode = 1; 457 break; 458 case 'n': 459 resolve = 0; 460 break; 461 case 'o': 462 use_bootfile = 1; 463 break; 464 case 'p': /* path */ 465 if (strlen(optarg) >= sizeof(sunx.sun_path)) 466 errx(1, "%s path too long, exiting", optarg); 467 funix_default.name = optarg; 468 break; 469 case 'P': /* path for alt. PID */ 470 PidFile = optarg; 471 break; 472 case 's': /* no network mode */ 473 SecureMode++; 474 break; 475 case 'S': /* path for privileged originator */ 476 if (strlen(optarg) >= sizeof(sunx.sun_path)) 477 errx(1, "%s path too long, exiting", optarg); 478 funix_secure.name = optarg; 479 break; 480 case 'T': 481 RemoteAddDate = 1; 482 break; 483 case 'u': /* only log specified priority */ 484 UniquePriority++; 485 break; 486 case 'v': /* log facility and priority */ 487 LogFacPri++; 488 break; 489 default: 490 usage(); 491 } 492 if ((argc -= optind) != 0) 493 usage(); 494 495 pfh = pidfile_open(PidFile, 0600, &spid); 496 if (pfh == NULL) { 497 if (errno == EEXIST) 498 errx(1, "syslogd already running, pid: %d", spid); 499 warn("cannot open pid file"); 500 } 501 502 if (!Debug) { 503 ppid = waitdaemon(0, 0, 30); 504 if (ppid < 0) { 505 warn("could not become daemon"); 506 pidfile_remove(pfh); 507 exit(1); 508 } 509 } else { 510 setlinebuf(stdout); 511 } 512 513 if (NumAllowed) 514 endservent(); 515 516 consfile.f_type = F_CONSOLE; 517 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 518 sizeof(consfile.f_un.f_fname)); 519 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 520 (void)signal(SIGTERM, dodie); 521 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 522 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 523 /* 524 * We don't want the SIGCHLD and SIGHUP handlers to interfere 525 * with each other; they are likely candidates for being called 526 * simultaneously (SIGHUP closes pipe descriptor, process dies, 527 * SIGCHLD happens). 528 */ 529 sigemptyset(&mask); 530 sigaddset(&mask, SIGHUP); 531 sact.sa_handler = reapchild; 532 sact.sa_mask = mask; 533 sact.sa_flags = SA_RESTART; 534 (void)sigaction(SIGCHLD, &sact, NULL); 535 (void)signal(SIGALRM, domark); 536 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 537 (void)alarm(TIMERINTVL); 538 539 TAILQ_INIT(&deadq_head); 540 541#ifndef SUN_LEN 542#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 543#endif 544 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 545 (void)unlink(fx->name); 546 memset(&sunx, 0, sizeof(sunx)); 547 sunx.sun_family = AF_LOCAL; 548 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 549 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 550 if (fx->s < 0 || 551 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 552 chmod(fx->name, fx->mode) < 0) { 553 (void)snprintf(line, sizeof line, 554 "cannot create %s", fx->name); 555 logerror(line); 556 dprintf("cannot create %s (%d)\n", fx->name, errno); 557 if (fx == &funix_default || fx == &funix_secure) 558 die(0); 559 else { 560 STAILQ_REMOVE(&funixes, fx, funix, next); 561 continue; 562 } 563 } 564 increase_rcvbuf(fx->s); 565 } 566 if (SecureMode <= 1) 567 finet = socksetup(family, bindhostname); 568 569 if (finet) { 570 if (SecureMode) { 571 for (i = 0; i < *finet; i++) { 572 if (shutdown(finet[i+1], SHUT_RD) < 0 && 573 errno != ENOTCONN) { 574 logerror("shutdown"); 575 if (!Debug) 576 die(0); 577 } 578 } 579 } else { 580 dprintf("listening on inet and/or inet6 socket\n"); 581 } 582 dprintf("sending on inet and/or inet6 socket\n"); 583 } 584 585 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 586 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 587 fklog = -1; 588 if (fklog < 0) 589 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 590 591 /* tuck my process id away */ 592 pidfile_write(pfh); 593 594 dprintf("off & running....\n"); 595 596 init(0); 597 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 598 sigemptyset(&mask); 599 sigaddset(&mask, SIGCHLD); 600 sact.sa_handler = init; 601 sact.sa_mask = mask; 602 sact.sa_flags = SA_RESTART; 603 (void)sigaction(SIGHUP, &sact, NULL); 604 605 tvp = &tv; 606 tv.tv_sec = tv.tv_usec = 0; 607 608 if (fklog != -1 && fklog > fdsrmax) 609 fdsrmax = fklog; 610 if (finet && !SecureMode) { 611 for (i = 0; i < *finet; i++) { 612 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 613 fdsrmax = finet[i+1]; 614 } 615 } 616 STAILQ_FOREACH(fx, &funixes, next) 617 if (fx->s > fdsrmax) 618 fdsrmax = fx->s; 619 620 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 621 sizeof(fd_mask)); 622 if (fdsr == NULL) 623 errx(1, "calloc fd_set"); 624 625 for (;;) { 626 if (MarkSet) 627 markit(); 628 if (WantDie) 629 die(WantDie); 630 631 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 632 sizeof(fd_mask)); 633 634 if (fklog != -1) 635 FD_SET(fklog, fdsr); 636 if (finet && !SecureMode) { 637 for (i = 0; i < *finet; i++) { 638 if (finet[i+1] != -1) 639 FD_SET(finet[i+1], fdsr); 640 } 641 } 642 STAILQ_FOREACH(fx, &funixes, next) 643 FD_SET(fx->s, fdsr); 644 645 i = select(fdsrmax+1, fdsr, NULL, NULL, 646 needdofsync ? &tv : tvp); 647 switch (i) { 648 case 0: 649 dofsync(); 650 needdofsync = 0; 651 if (tvp) { 652 tvp = NULL; 653 if (ppid != 1) 654 kill(ppid, SIGALRM); 655 } 656 continue; 657 case -1: 658 if (errno != EINTR) 659 logerror("select"); 660 continue; 661 } 662 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 663 readklog(); 664 if (finet && !SecureMode) { 665 for (i = 0; i < *finet; i++) { 666 if (FD_ISSET(finet[i+1], fdsr)) { 667 len = sizeof(frominet); 668 l = recvfrom(finet[i+1], line, MAXLINE, 669 0, (struct sockaddr *)&frominet, 670 &len); 671 if (l > 0) { 672 line[l] = '\0'; 673 hname = cvthname((struct sockaddr *)&frominet); 674 unmapped((struct sockaddr *)&frominet); 675 if (validate((struct sockaddr *)&frominet, hname)) 676 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 677 } else if (l < 0 && errno != EINTR) 678 logerror("recvfrom inet"); 679 } 680 } 681 } 682 STAILQ_FOREACH(fx, &funixes, next) { 683 if (FD_ISSET(fx->s, fdsr)) { 684 len = sizeof(fromunix); 685 l = recvfrom(fx->s, line, MAXLINE, 0, 686 (struct sockaddr *)&fromunix, &len); 687 if (l > 0) { 688 line[l] = '\0'; 689 printline(LocalHostName, line, 0); 690 } else if (l < 0 && errno != EINTR) 691 logerror("recvfrom unix"); 692 } 693 } 694 } 695 if (fdsr) 696 free(fdsr); 697} 698 699static void 700unmapped(struct sockaddr *sa) 701{ 702 struct sockaddr_in6 *sin6; 703 struct sockaddr_in sin4; 704 705 if (sa->sa_family != AF_INET6) 706 return; 707 if (sa->sa_len != sizeof(struct sockaddr_in6) || 708 sizeof(sin4) > sa->sa_len) 709 return; 710 sin6 = (struct sockaddr_in6 *)sa; 711 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 712 return; 713 714 memset(&sin4, 0, sizeof(sin4)); 715 sin4.sin_family = AF_INET; 716 sin4.sin_len = sizeof(struct sockaddr_in); 717 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 718 sizeof(sin4.sin_addr)); 719 sin4.sin_port = sin6->sin6_port; 720 721 memcpy(sa, &sin4, sin4.sin_len); 722} 723 724static void 725usage(void) 726{ 727 728 fprintf(stderr, "%s\n%s\n%s\n%s\n", 729 "usage: syslogd [-468ACcdknosTuv] [-a allowed_peer]", 730 " [-b bind_address] [-f config_file]", 731 " [-l [mode:]path] [-m mark_interval]", 732 " [-P pid_file] [-p log_socket]"); 733 exit(1); 734} 735 736/* 737 * Take a raw input line, decode the message, and print the message 738 * on the appropriate log files. 739 */ 740static void 741printline(const char *hname, char *msg, int flags) 742{ 743 char *p, *q; 744 long n; 745 int c, pri; 746 char line[MAXLINE + 1]; 747 748 /* test for special codes */ 749 p = msg; 750 pri = DEFUPRI; 751 if (*p == '<') { 752 errno = 0; 753 n = strtol(p + 1, &q, 10); 754 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 755 p = q + 1; 756 pri = n; 757 } 758 } 759 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 760 pri = DEFUPRI; 761 762 /* 763 * Don't allow users to log kernel messages. 764 * NOTE: since LOG_KERN == 0 this will also match 765 * messages with no facility specified. 766 */ 767 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 768 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 769 770 q = line; 771 772 while ((c = (unsigned char)*p++) != '\0' && 773 q < &line[sizeof(line) - 4]) { 774 if (mask_C1 && (c & 0x80) && c < 0xA0) { 775 c &= 0x7F; 776 *q++ = 'M'; 777 *q++ = '-'; 778 } 779 if (isascii(c) && iscntrl(c)) { 780 if (c == '\n') { 781 *q++ = ' '; 782 } else if (c == '\t') { 783 *q++ = '\t'; 784 } else { 785 *q++ = '^'; 786 *q++ = c ^ 0100; 787 } 788 } else { 789 *q++ = c; 790 } 791 } 792 *q = '\0'; 793 794 logmsg(pri, line, hname, flags); 795} 796 797/* 798 * Read /dev/klog while data are available, split into lines. 799 */ 800static void 801readklog(void) 802{ 803 char *p, *q, line[MAXLINE + 1]; 804 int len, i; 805 806 len = 0; 807 for (;;) { 808 i = read(fklog, line + len, MAXLINE - 1 - len); 809 if (i > 0) { 810 line[i + len] = '\0'; 811 } else { 812 if (i < 0 && errno != EINTR && errno != EAGAIN) { 813 logerror("klog"); 814 fklog = -1; 815 } 816 break; 817 } 818 819 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 820 *q = '\0'; 821 printsys(p); 822 } 823 len = strlen(p); 824 if (len >= MAXLINE - 1) { 825 printsys(p); 826 len = 0; 827 } 828 if (len > 0) 829 memmove(line, p, len + 1); 830 } 831 if (len > 0) 832 printsys(line); 833} 834 835/* 836 * Take a raw input line from /dev/klog, format similar to syslog(). 837 */ 838static void 839printsys(char *msg) 840{ 841 char *p, *q; 842 long n; 843 int flags, isprintf, pri; 844 845 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 846 p = msg; 847 pri = DEFSPRI; 848 isprintf = 1; 849 if (*p == '<') { 850 errno = 0; 851 n = strtol(p + 1, &q, 10); 852 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 853 p = q + 1; 854 pri = n; 855 isprintf = 0; 856 } 857 } 858 /* 859 * Kernel printf's and LOG_CONSOLE messages have been displayed 860 * on the console already. 861 */ 862 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 863 flags |= IGN_CONS; 864 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 865 pri = DEFSPRI; 866 logmsg(pri, p, LocalHostName, flags); 867} 868 869static time_t now; 870 871/* 872 * Match a program or host name against a specification. 873 * Return a non-0 value if the message must be ignored 874 * based on the specification. 875 */ 876static int 877skip_message(const char *name, const char *spec, int checkcase) 878{ 879 const char *s; 880 char prev, next; 881 int exclude = 0; 882 /* Behaviour on explicit match */ 883 884 if (spec == NULL) 885 return 0; 886 switch (*spec) { 887 case '-': 888 exclude = 1; 889 /*FALLTHROUGH*/ 890 case '+': 891 spec++; 892 break; 893 default: 894 break; 895 } 896 if (checkcase) 897 s = strstr (spec, name); 898 else 899 s = strcasestr (spec, name); 900 901 if (s != NULL) { 902 prev = (s == spec ? ',' : *(s - 1)); 903 next = *(s + strlen (name)); 904 905 if (prev == ',' && (next == '\0' || next == ',')) 906 /* Explicit match: skip iff the spec is an 907 exclusive one. */ 908 return exclude; 909 } 910 911 /* No explicit match for this name: skip the message iff 912 the spec is an inclusive one. */ 913 return !exclude; 914} 915 916/* 917 * Log a message to the appropriate log files, users, etc. based on 918 * the priority. 919 */ 920static void 921logmsg(int pri, const char *msg, const char *from, int flags) 922{ 923 struct filed *f; 924 int i, fac, msglen, omask, prilev; 925 const char *timestamp; 926 char prog[NAME_MAX+1]; 927 char buf[MAXLINE+1]; 928 929 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 930 pri, flags, from, msg); 931 932 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 933 934 /* 935 * Check to see if msg looks non-standard. 936 */ 937 msglen = strlen(msg); 938 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 939 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 940 flags |= ADDDATE; 941 942 (void)time(&now); 943 if (flags & ADDDATE) { 944 timestamp = ctime(&now) + 4; 945 } else { 946 timestamp = msg; 947 msg += 16; 948 msglen -= 16; 949 } 950 951 /* skip leading blanks */ 952 while (isspace(*msg)) { 953 msg++; 954 msglen--; 955 } 956 957 /* extract facility and priority level */ 958 if (flags & MARK) 959 fac = LOG_NFACILITIES; 960 else 961 fac = LOG_FAC(pri); 962 963 /* Check maximum facility number. */ 964 if (fac > LOG_NFACILITIES) { 965 (void)sigsetmask(omask); 966 return; 967 } 968 969 prilev = LOG_PRI(pri); 970 971 /* extract program name */ 972 for (i = 0; i < NAME_MAX; i++) { 973 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 974 msg[i] == '/' || isspace(msg[i])) 975 break; 976 prog[i] = msg[i]; 977 } 978 prog[i] = 0; 979 980 /* add kernel prefix for kernel messages */ 981 if (flags & ISKERNEL) { 982 snprintf(buf, sizeof(buf), "%s: %s", 983 use_bootfile ? bootfile : "kernel", msg); 984 msg = buf; 985 msglen = strlen(buf); 986 } 987 988 /* log the message to the particular outputs */ 989 if (!Initialized) { 990 f = &consfile; 991 /* 992 * Open in non-blocking mode to avoid hangs during open 993 * and close(waiting for the port to drain). 994 */ 995 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 996 997 if (f->f_file >= 0) { 998 (void)strlcpy(f->f_lasttime, timestamp, 999 sizeof(f->f_lasttime)); 1000 fprintlog(f, flags, msg); 1001 close(f->f_file); 1002 f->f_file = -1; 1003 } 1004 (void)sigsetmask(omask); 1005 return; 1006 } 1007 for (f = Files; f; f = f->f_next) { 1008 /* skip messages that are incorrect priority */ 1009 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1010 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1011 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1012 ) 1013 || f->f_pmask[fac] == INTERNAL_NOPRI) 1014 continue; 1015 1016 /* skip messages with the incorrect hostname */ 1017 if (skip_message(from, f->f_host, 0)) 1018 continue; 1019 1020 /* skip messages with the incorrect program name */ 1021 if (skip_message(prog, f->f_program, 1)) 1022 continue; 1023 1024 /* skip message to console if it has already been printed */ 1025 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1026 continue; 1027 1028 /* don't output marks to recently written files */ 1029 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1030 continue; 1031 1032 /* 1033 * suppress duplicate lines to this file 1034 */ 1035 if (no_compress - (f->f_type != F_PIPE) < 1 && 1036 (flags & MARK) == 0 && msglen == f->f_prevlen && 1037 !strcmp(msg, f->f_prevline) && 1038 !strcasecmp(from, f->f_prevhost)) { 1039 (void)strlcpy(f->f_lasttime, timestamp, 1040 sizeof(f->f_lasttime)); 1041 f->f_prevcount++; 1042 dprintf("msg repeated %d times, %ld sec of %d\n", 1043 f->f_prevcount, (long)(now - f->f_time), 1044 repeatinterval[f->f_repeatcount]); 1045 /* 1046 * If domark would have logged this by now, 1047 * flush it now (so we don't hold isolated messages), 1048 * but back off so we'll flush less often 1049 * in the future. 1050 */ 1051 if (now > REPEATTIME(f)) { 1052 fprintlog(f, flags, (char *)NULL); 1053 BACKOFF(f); 1054 } 1055 } else { 1056 /* new line, save it */ 1057 if (f->f_prevcount) 1058 fprintlog(f, 0, (char *)NULL); 1059 f->f_repeatcount = 0; 1060 f->f_prevpri = pri; 1061 (void)strlcpy(f->f_lasttime, timestamp, 1062 sizeof(f->f_lasttime)); 1063 (void)strlcpy(f->f_prevhost, from, 1064 sizeof(f->f_prevhost)); 1065 if (msglen < MAXSVLINE) { 1066 f->f_prevlen = msglen; 1067 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1068 fprintlog(f, flags, (char *)NULL); 1069 } else { 1070 f->f_prevline[0] = 0; 1071 f->f_prevlen = 0; 1072 fprintlog(f, flags, msg); 1073 } 1074 } 1075 } 1076 (void)sigsetmask(omask); 1077} 1078 1079static void 1080dofsync(void) 1081{ 1082 struct filed *f; 1083 1084 for (f = Files; f; f = f->f_next) { 1085 if ((f->f_type == F_FILE) && 1086 (f->f_flags & FFLAG_NEEDSYNC)) { 1087 f->f_flags &= ~FFLAG_NEEDSYNC; 1088 (void)fsync(f->f_file); 1089 } 1090 } 1091} 1092 1093#define IOV_SIZE 7 1094static void 1095fprintlog(struct filed *f, int flags, const char *msg) 1096{ 1097 struct iovec iov[IOV_SIZE]; 1098 struct iovec *v; 1099 struct addrinfo *r; 1100 int i, l, lsent = 0; 1101 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1102 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1103 const char *msgret; 1104 1105 v = iov; 1106 if (f->f_type == F_WALL) { 1107 v->iov_base = greetings; 1108 /* The time displayed is not synchornized with the other log 1109 * destinations (like messages). Following fragment was using 1110 * ctime(&now), which was updating the time every 30 sec. 1111 * With f_lasttime, time is synchronized correctly. 1112 */ 1113 v->iov_len = snprintf(greetings, sizeof greetings, 1114 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1115 f->f_prevhost, f->f_lasttime); 1116 if (v->iov_len >= sizeof greetings) 1117 v->iov_len = sizeof greetings - 1; 1118 v++; 1119 v->iov_base = nul; 1120 v->iov_len = 0; 1121 v++; 1122 } else { 1123 v->iov_base = f->f_lasttime; 1124 v->iov_len = strlen(f->f_lasttime); 1125 v++; 1126 v->iov_base = space; 1127 v->iov_len = 1; 1128 v++; 1129 } 1130 1131 if (LogFacPri) { 1132 static char fp_buf[30]; /* Hollow laugh */ 1133 int fac = f->f_prevpri & LOG_FACMASK; 1134 int pri = LOG_PRI(f->f_prevpri); 1135 const char *f_s = NULL; 1136 char f_n[5]; /* Hollow laugh */ 1137 const char *p_s = NULL; 1138 char p_n[5]; /* Hollow laugh */ 1139 1140 if (LogFacPri > 1) { 1141 const CODE *c; 1142 1143 for (c = facilitynames; c->c_name; c++) { 1144 if (c->c_val == fac) { 1145 f_s = c->c_name; 1146 break; 1147 } 1148 } 1149 for (c = prioritynames; c->c_name; c++) { 1150 if (c->c_val == pri) { 1151 p_s = c->c_name; 1152 break; 1153 } 1154 } 1155 } 1156 if (!f_s) { 1157 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1158 f_s = f_n; 1159 } 1160 if (!p_s) { 1161 snprintf(p_n, sizeof p_n, "%d", pri); 1162 p_s = p_n; 1163 } 1164 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1165 v->iov_base = fp_buf; 1166 v->iov_len = strlen(fp_buf); 1167 } else { 1168 v->iov_base = nul; 1169 v->iov_len = 0; 1170 } 1171 v++; 1172 1173 v->iov_base = f->f_prevhost; 1174 v->iov_len = strlen(v->iov_base); 1175 v++; 1176 v->iov_base = space; 1177 v->iov_len = 1; 1178 v++; 1179 1180 if (msg) { 1181 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1182 if (wmsg == NULL) { 1183 logerror("strdup"); 1184 exit(1); 1185 } 1186 v->iov_base = wmsg; 1187 v->iov_len = strlen(msg); 1188 } else if (f->f_prevcount > 1) { 1189 v->iov_base = repbuf; 1190 v->iov_len = snprintf(repbuf, sizeof repbuf, 1191 "last message repeated %d times", f->f_prevcount); 1192 } else { 1193 v->iov_base = f->f_prevline; 1194 v->iov_len = f->f_prevlen; 1195 } 1196 v++; 1197 1198 dprintf("Logging to %s", TypeNames[f->f_type]); 1199 f->f_time = now; 1200 1201 switch (f->f_type) { 1202 int port; 1203 case F_UNUSED: 1204 dprintf("\n"); 1205 break; 1206 1207 case F_FORW: 1208 port = (int)ntohs(((struct sockaddr_in *) 1209 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1210 if (port != 514) { 1211 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1212 } else { 1213 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1214 } 1215 /* check for local vs remote messages */ 1216 if (strcasecmp(f->f_prevhost, LocalHostName)) 1217 l = snprintf(line, sizeof line - 1, 1218 "<%d>%.15s Forwarded from %s: %s", 1219 f->f_prevpri, (char *)iov[0].iov_base, 1220 f->f_prevhost, (char *)iov[5].iov_base); 1221 else 1222 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1223 f->f_prevpri, (char *)iov[0].iov_base, 1224 (char *)iov[5].iov_base); 1225 if (l < 0) 1226 l = 0; 1227 else if (l > MAXLINE) 1228 l = MAXLINE; 1229 1230 if (finet) { 1231 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1232 for (i = 0; i < *finet; i++) { 1233#if 0 1234 /* 1235 * should we check AF first, or just 1236 * trial and error? FWD 1237 */ 1238 if (r->ai_family == 1239 address_family_of(finet[i+1])) 1240#endif 1241 lsent = sendto(finet[i+1], line, l, 0, 1242 r->ai_addr, r->ai_addrlen); 1243 if (lsent == l) 1244 break; 1245 } 1246 if (lsent == l && !send_to_all) 1247 break; 1248 } 1249 dprintf("lsent/l: %d/%d\n", lsent, l); 1250 if (lsent != l) { 1251 int e = errno; 1252 logerror("sendto"); 1253 errno = e; 1254 switch (errno) { 1255 case ENOBUFS: 1256 case ENETDOWN: 1257 case ENETUNREACH: 1258 case EHOSTUNREACH: 1259 case EHOSTDOWN: 1260 case EADDRNOTAVAIL: 1261 break; 1262 /* case EBADF: */ 1263 /* case EACCES: */ 1264 /* case ENOTSOCK: */ 1265 /* case EFAULT: */ 1266 /* case EMSGSIZE: */ 1267 /* case EAGAIN: */ 1268 /* case ENOBUFS: */ 1269 /* case ECONNREFUSED: */ 1270 default: 1271 dprintf("removing entry: errno=%d\n", e); 1272 f->f_type = F_UNUSED; 1273 break; 1274 } 1275 } 1276 } 1277 break; 1278 1279 case F_FILE: 1280 dprintf(" %s\n", f->f_un.f_fname); 1281 v->iov_base = lf; 1282 v->iov_len = 1; 1283 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1284 /* 1285 * If writev(2) fails for potentially transient errors 1286 * like the filesystem being full, ignore it. 1287 * Otherwise remove this logfile from the list. 1288 */ 1289 if (errno != ENOSPC) { 1290 int e = errno; 1291 close_filed(f); 1292 errno = e; 1293 logerror(f->f_un.f_fname); 1294 } 1295 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1296 f->f_flags |= FFLAG_NEEDSYNC; 1297 needdofsync = 1; 1298 } 1299 break; 1300 1301 case F_PIPE: 1302 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1303 v->iov_base = lf; 1304 v->iov_len = 1; 1305 if (f->f_un.f_pipe.f_pid == 0) { 1306 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1307 &f->f_un.f_pipe.f_pid)) < 0) { 1308 f->f_type = F_UNUSED; 1309 logerror(f->f_un.f_pipe.f_pname); 1310 break; 1311 } 1312 } 1313 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1314 int e = errno; 1315 close_filed(f); 1316 if (f->f_un.f_pipe.f_pid > 0) 1317 deadq_enter(f->f_un.f_pipe.f_pid, 1318 f->f_un.f_pipe.f_pname); 1319 f->f_un.f_pipe.f_pid = 0; 1320 errno = e; 1321 logerror(f->f_un.f_pipe.f_pname); 1322 } 1323 break; 1324 1325 case F_CONSOLE: 1326 if (flags & IGN_CONS) { 1327 dprintf(" (ignored)\n"); 1328 break; 1329 } 1330 /* FALLTHROUGH */ 1331 1332 case F_TTY: 1333 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1334 v->iov_base = crlf; 1335 v->iov_len = 2; 1336 1337 errno = 0; /* ttymsg() only sometimes returns an errno */ 1338 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1339 f->f_type = F_UNUSED; 1340 logerror(msgret); 1341 } 1342 break; 1343 1344 case F_USERS: 1345 case F_WALL: 1346 dprintf("\n"); 1347 v->iov_base = crlf; 1348 v->iov_len = 2; 1349 wallmsg(f, iov, IOV_SIZE); 1350 break; 1351 } 1352 f->f_prevcount = 0; 1353 free(wmsg); 1354} 1355 1356/* 1357 * WALLMSG -- Write a message to the world at large 1358 * 1359 * Write the specified message to either the entire 1360 * world, or a list of approved users. 1361 */ 1362static void 1363wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1364{ 1365 static int reenter; /* avoid calling ourselves */ 1366 struct utmpx *ut; 1367 int i; 1368 const char *p; 1369 1370 if (reenter++) 1371 return; 1372 setutxent(); 1373 /* NOSTRICT */ 1374 while ((ut = getutxent()) != NULL) { 1375 if (ut->ut_type != USER_PROCESS) 1376 continue; 1377 if (f->f_type == F_WALL) { 1378 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1379 TTYMSGTIME)) != NULL) { 1380 errno = 0; /* already in msg */ 1381 logerror(p); 1382 } 1383 continue; 1384 } 1385 /* should we send the message to this user? */ 1386 for (i = 0; i < MAXUNAMES; i++) { 1387 if (!f->f_un.f_uname[i][0]) 1388 break; 1389 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1390 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1391 TTYMSGTIME)) != NULL) { 1392 errno = 0; /* already in msg */ 1393 logerror(p); 1394 } 1395 break; 1396 } 1397 } 1398 } 1399 endutxent(); 1400 reenter = 0; 1401} 1402 1403static void 1404reapchild(int signo __unused) 1405{ 1406 int status; 1407 pid_t pid; 1408 struct filed *f; 1409 1410 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1411 if (!Initialized) 1412 /* Don't tell while we are initting. */ 1413 continue; 1414 1415 /* First, look if it's a process from the dead queue. */ 1416 if (deadq_remove(pid)) 1417 goto oncemore; 1418 1419 /* Now, look in list of active processes. */ 1420 for (f = Files; f; f = f->f_next) 1421 if (f->f_type == F_PIPE && 1422 f->f_un.f_pipe.f_pid == pid) { 1423 close_filed(f); 1424 f->f_un.f_pipe.f_pid = 0; 1425 log_deadchild(pid, status, 1426 f->f_un.f_pipe.f_pname); 1427 break; 1428 } 1429 oncemore: 1430 continue; 1431 } 1432} 1433 1434/* 1435 * Return a printable representation of a host address. 1436 */ 1437static const char * 1438cvthname(struct sockaddr *f) 1439{ 1440 int error, hl; 1441 sigset_t omask, nmask; 1442 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1443 1444 error = getnameinfo((struct sockaddr *)f, 1445 ((struct sockaddr *)f)->sa_len, 1446 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1447 dprintf("cvthname(%s)\n", ip); 1448 1449 if (error) { 1450 dprintf("Malformed from address %s\n", gai_strerror(error)); 1451 return ("???"); 1452 } 1453 if (!resolve) 1454 return (ip); 1455 1456 sigemptyset(&nmask); 1457 sigaddset(&nmask, SIGHUP); 1458 sigprocmask(SIG_BLOCK, &nmask, &omask); 1459 error = getnameinfo((struct sockaddr *)f, 1460 ((struct sockaddr *)f)->sa_len, 1461 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1462 sigprocmask(SIG_SETMASK, &omask, NULL); 1463 if (error) { 1464 dprintf("Host name for your address (%s) unknown\n", ip); 1465 return (ip); 1466 } 1467 hl = strlen(hname); 1468 if (hl > 0 && hname[hl-1] == '.') 1469 hname[--hl] = '\0'; 1470 trimdomain(hname, hl); 1471 return (hname); 1472} 1473 1474static void 1475dodie(int signo) 1476{ 1477 1478 WantDie = signo; 1479} 1480 1481static void 1482domark(int signo __unused) 1483{ 1484 1485 MarkSet = 1; 1486} 1487 1488/* 1489 * Print syslogd errors some place. 1490 */ 1491static void 1492logerror(const char *type) 1493{ 1494 char buf[512]; 1495 static int recursed = 0; 1496 1497 /* If there's an error while trying to log an error, give up. */ 1498 if (recursed) 1499 return; 1500 recursed++; 1501 if (errno) 1502 (void)snprintf(buf, 1503 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1504 else 1505 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1506 errno = 0; 1507 dprintf("%s\n", buf); 1508 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1509 recursed--; 1510} 1511 1512static void 1513die(int signo) 1514{ 1515 struct filed *f; 1516 struct funix *fx; 1517 int was_initialized; 1518 char buf[100]; 1519 1520 was_initialized = Initialized; 1521 Initialized = 0; /* Don't log SIGCHLDs. */ 1522 for (f = Files; f != NULL; f = f->f_next) { 1523 /* flush any pending output */ 1524 if (f->f_prevcount) 1525 fprintlog(f, 0, (char *)NULL); 1526 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1527 close_filed(f); 1528 f->f_un.f_pipe.f_pid = 0; 1529 } 1530 } 1531 Initialized = was_initialized; 1532 if (signo) { 1533 dprintf("syslogd: exiting on signal %d\n", signo); 1534 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1535 errno = 0; 1536 logerror(buf); 1537 } 1538 STAILQ_FOREACH(fx, &funixes, next) 1539 (void)unlink(fx->name); 1540 pidfile_remove(pfh); 1541 1542 exit(1); 1543} 1544 1545/* 1546 * INIT -- Initialize syslogd from configuration table 1547 */ 1548static void 1549init(int signo) 1550{ 1551 int i; 1552 FILE *cf; 1553 struct filed *f, *next, **nextp; 1554 char *p; 1555 char cline[LINE_MAX]; 1556 char prog[LINE_MAX]; 1557 char host[MAXHOSTNAMELEN]; 1558 char oldLocalHostName[MAXHOSTNAMELEN]; 1559 char hostMsg[2*MAXHOSTNAMELEN+40]; 1560 char bootfileMsg[LINE_MAX]; 1561 1562 dprintf("init\n"); 1563 1564 /* 1565 * Load hostname (may have changed). 1566 */ 1567 if (signo != 0) 1568 (void)strlcpy(oldLocalHostName, LocalHostName, 1569 sizeof(oldLocalHostName)); 1570 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1571 err(EX_OSERR, "gethostname() failed"); 1572 if ((p = strchr(LocalHostName, '.')) != NULL) { 1573 *p++ = '\0'; 1574 LocalDomain = p; 1575 } else { 1576 LocalDomain = ""; 1577 } 1578 1579 /* 1580 * Close all open log files. 1581 */ 1582 Initialized = 0; 1583 for (f = Files; f != NULL; f = next) { 1584 /* flush any pending output */ 1585 if (f->f_prevcount) 1586 fprintlog(f, 0, (char *)NULL); 1587 1588 switch (f->f_type) { 1589 case F_FILE: 1590 case F_FORW: 1591 case F_CONSOLE: 1592 case F_TTY: 1593 close_filed(f); 1594 break; 1595 case F_PIPE: 1596 if (f->f_un.f_pipe.f_pid > 0) { 1597 close_filed(f); 1598 deadq_enter(f->f_un.f_pipe.f_pid, 1599 f->f_un.f_pipe.f_pname); 1600 } 1601 f->f_un.f_pipe.f_pid = 0; 1602 break; 1603 } 1604 next = f->f_next; 1605 if (f->f_program) free(f->f_program); 1606 if (f->f_host) free(f->f_host); 1607 free((char *)f); 1608 } 1609 Files = NULL; 1610 nextp = &Files; 1611 1612 /* open the configuration file */ 1613 if ((cf = fopen(ConfFile, "r")) == NULL) { 1614 dprintf("cannot open %s\n", ConfFile); 1615 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1616 if (*nextp == NULL) { 1617 logerror("calloc"); 1618 exit(1); 1619 } 1620 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1621 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1622 if ((*nextp)->f_next == NULL) { 1623 logerror("calloc"); 1624 exit(1); 1625 } 1626 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1627 Initialized = 1; 1628 return; 1629 } 1630 1631 /* 1632 * Foreach line in the conf table, open that file. 1633 */ 1634 f = NULL; 1635 (void)strlcpy(host, "*", sizeof(host)); 1636 (void)strlcpy(prog, "*", sizeof(prog)); 1637 while (fgets(cline, sizeof(cline), cf) != NULL) { 1638 /* 1639 * check for end-of-section, comments, strip off trailing 1640 * spaces and newline character. #!prog is treated specially: 1641 * following lines apply only to that program. 1642 */ 1643 for (p = cline; isspace(*p); ++p) 1644 continue; 1645 if (*p == 0) 1646 continue; 1647 if (*p == '#') { 1648 p++; 1649 if (*p != '!' && *p != '+' && *p != '-') 1650 continue; 1651 } 1652 if (*p == '+' || *p == '-') { 1653 host[0] = *p++; 1654 while (isspace(*p)) 1655 p++; 1656 if ((!*p) || (*p == '*')) { 1657 (void)strlcpy(host, "*", sizeof(host)); 1658 continue; 1659 } 1660 if (*p == '@') 1661 p = LocalHostName; 1662 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1663 if (!isalnum(*p) && *p != '.' && *p != '-' 1664 && *p != ',' && *p != ':' && *p != '%') 1665 break; 1666 host[i] = *p++; 1667 } 1668 host[i] = '\0'; 1669 continue; 1670 } 1671 if (*p == '!') { 1672 p++; 1673 while (isspace(*p)) p++; 1674 if ((!*p) || (*p == '*')) { 1675 (void)strlcpy(prog, "*", sizeof(prog)); 1676 continue; 1677 } 1678 for (i = 0; i < LINE_MAX - 1; i++) { 1679 if (!isprint(p[i]) || isspace(p[i])) 1680 break; 1681 prog[i] = p[i]; 1682 } 1683 prog[i] = 0; 1684 continue; 1685 } 1686 for (p = cline + 1; *p != '\0'; p++) { 1687 if (*p != '#') 1688 continue; 1689 if (*(p - 1) == '\\') { 1690 strcpy(p - 1, p); 1691 p--; 1692 continue; 1693 } 1694 *p = '\0'; 1695 break; 1696 } 1697 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1698 cline[i] = '\0'; 1699 f = (struct filed *)calloc(1, sizeof(*f)); 1700 if (f == NULL) { 1701 logerror("calloc"); 1702 exit(1); 1703 } 1704 *nextp = f; 1705 nextp = &f->f_next; 1706 cfline(cline, f, prog, host); 1707 } 1708 1709 /* close the configuration file */ 1710 (void)fclose(cf); 1711 1712 Initialized = 1; 1713 1714 if (Debug) { 1715 int port; 1716 for (f = Files; f; f = f->f_next) { 1717 for (i = 0; i <= LOG_NFACILITIES; i++) 1718 if (f->f_pmask[i] == INTERNAL_NOPRI) 1719 printf("X "); 1720 else 1721 printf("%d ", f->f_pmask[i]); 1722 printf("%s: ", TypeNames[f->f_type]); 1723 switch (f->f_type) { 1724 case F_FILE: 1725 printf("%s", f->f_un.f_fname); 1726 break; 1727 1728 case F_CONSOLE: 1729 case F_TTY: 1730 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1731 break; 1732 1733 case F_FORW: 1734 port = (int)ntohs(((struct sockaddr_in *) 1735 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1736 if (port != 514) { 1737 printf("%s:%d", 1738 f->f_un.f_forw.f_hname, port); 1739 } else { 1740 printf("%s", f->f_un.f_forw.f_hname); 1741 } 1742 break; 1743 1744 case F_PIPE: 1745 printf("%s", f->f_un.f_pipe.f_pname); 1746 break; 1747 1748 case F_USERS: 1749 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1750 printf("%s, ", f->f_un.f_uname[i]); 1751 break; 1752 } 1753 if (f->f_program) 1754 printf(" (%s)", f->f_program); 1755 printf("\n"); 1756 } 1757 } 1758 1759 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1760 dprintf("syslogd: restarted\n"); 1761 /* 1762 * Log a change in hostname, but only on a restart. 1763 */ 1764 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1765 (void)snprintf(hostMsg, sizeof(hostMsg), 1766 "syslogd: hostname changed, \"%s\" to \"%s\"", 1767 oldLocalHostName, LocalHostName); 1768 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1769 dprintf("%s\n", hostMsg); 1770 } 1771 /* 1772 * Log the kernel boot file if we aren't going to use it as 1773 * the prefix, and if this is *not* a restart. 1774 */ 1775 if (signo == 0 && !use_bootfile) { 1776 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1777 "syslogd: kernel boot file is %s", bootfile); 1778 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1779 dprintf("%s\n", bootfileMsg); 1780 } 1781} 1782 1783/* 1784 * Crack a configuration file line 1785 */ 1786static void 1787cfline(const char *line, struct filed *f, const char *prog, const char *host) 1788{ 1789 struct addrinfo hints, *res; 1790 int error, i, pri, syncfile; 1791 const char *p, *q; 1792 char *bp; 1793 char buf[MAXLINE], ebuf[100]; 1794 1795 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1796 1797 errno = 0; /* keep strerror() stuff out of logerror messages */ 1798 1799 /* clear out file entry */ 1800 memset(f, 0, sizeof(*f)); 1801 for (i = 0; i <= LOG_NFACILITIES; i++) 1802 f->f_pmask[i] = INTERNAL_NOPRI; 1803 1804 /* save hostname if any */ 1805 if (host && *host == '*') 1806 host = NULL; 1807 if (host) { 1808 int hl; 1809 1810 f->f_host = strdup(host); 1811 if (f->f_host == NULL) { 1812 logerror("strdup"); 1813 exit(1); 1814 } 1815 hl = strlen(f->f_host); 1816 if (hl > 0 && f->f_host[hl-1] == '.') 1817 f->f_host[--hl] = '\0'; 1818 trimdomain(f->f_host, hl); 1819 } 1820 1821 /* save program name if any */ 1822 if (prog && *prog == '*') 1823 prog = NULL; 1824 if (prog) { 1825 f->f_program = strdup(prog); 1826 if (f->f_program == NULL) { 1827 logerror("strdup"); 1828 exit(1); 1829 } 1830 } 1831 1832 /* scan through the list of selectors */ 1833 for (p = line; *p && *p != '\t' && *p != ' ';) { 1834 int pri_done; 1835 int pri_cmp; 1836 int pri_invert; 1837 1838 /* find the end of this facility name list */ 1839 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1840 continue; 1841 1842 /* get the priority comparison */ 1843 pri_cmp = 0; 1844 pri_done = 0; 1845 pri_invert = 0; 1846 if (*q == '!') { 1847 pri_invert = 1; 1848 q++; 1849 } 1850 while (!pri_done) { 1851 switch (*q) { 1852 case '<': 1853 pri_cmp |= PRI_LT; 1854 q++; 1855 break; 1856 case '=': 1857 pri_cmp |= PRI_EQ; 1858 q++; 1859 break; 1860 case '>': 1861 pri_cmp |= PRI_GT; 1862 q++; 1863 break; 1864 default: 1865 pri_done++; 1866 break; 1867 } 1868 } 1869 1870 /* collect priority name */ 1871 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1872 *bp++ = *q++; 1873 *bp = '\0'; 1874 1875 /* skip cruft */ 1876 while (strchr(",;", *q)) 1877 q++; 1878 1879 /* decode priority name */ 1880 if (*buf == '*') { 1881 pri = LOG_PRIMASK; 1882 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1883 } else { 1884 /* Ignore trailing spaces. */ 1885 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1886 buf[i] = '\0'; 1887 1888 pri = decode(buf, prioritynames); 1889 if (pri < 0) { 1890 errno = 0; 1891 (void)snprintf(ebuf, sizeof ebuf, 1892 "unknown priority name \"%s\"", buf); 1893 logerror(ebuf); 1894 return; 1895 } 1896 } 1897 if (!pri_cmp) 1898 pri_cmp = (UniquePriority) 1899 ? (PRI_EQ) 1900 : (PRI_EQ | PRI_GT) 1901 ; 1902 if (pri_invert) 1903 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1904 1905 /* scan facilities */ 1906 while (*p && !strchr("\t.; ", *p)) { 1907 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1908 *bp++ = *p++; 1909 *bp = '\0'; 1910 1911 if (*buf == '*') { 1912 for (i = 0; i < LOG_NFACILITIES; i++) { 1913 f->f_pmask[i] = pri; 1914 f->f_pcmp[i] = pri_cmp; 1915 } 1916 } else { 1917 i = decode(buf, facilitynames); 1918 if (i < 0) { 1919 errno = 0; 1920 (void)snprintf(ebuf, sizeof ebuf, 1921 "unknown facility name \"%s\"", 1922 buf); 1923 logerror(ebuf); 1924 return; 1925 } 1926 f->f_pmask[i >> 3] = pri; 1927 f->f_pcmp[i >> 3] = pri_cmp; 1928 } 1929 while (*p == ',' || *p == ' ') 1930 p++; 1931 } 1932 1933 p = q; 1934 } 1935 1936 /* skip to action part */ 1937 while (*p == '\t' || *p == ' ') 1938 p++; 1939 1940 if (*p == '-') { 1941 syncfile = 0; 1942 p++; 1943 } else 1944 syncfile = 1; 1945 1946 switch (*p) { 1947 case '@': 1948 { 1949 char *tp; 1950 char endkey = ':'; 1951 /* 1952 * scan forward to see if there is a port defined. 1953 * so we can't use strlcpy.. 1954 */ 1955 i = sizeof(f->f_un.f_forw.f_hname); 1956 tp = f->f_un.f_forw.f_hname; 1957 p++; 1958 1959 /* 1960 * an ipv6 address should start with a '[' in that case 1961 * we should scan for a ']' 1962 */ 1963 if (*p == '[') { 1964 p++; 1965 endkey = ']'; 1966 } 1967 while (*p && (*p != endkey) && (i-- > 0)) { 1968 *tp++ = *p++; 1969 } 1970 if (endkey == ']' && *p == endkey) 1971 p++; 1972 *tp = '\0'; 1973 } 1974 /* See if we copied a domain and have a port */ 1975 if (*p == ':') 1976 p++; 1977 else 1978 p = NULL; 1979 1980 memset(&hints, 0, sizeof(hints)); 1981 hints.ai_family = family; 1982 hints.ai_socktype = SOCK_DGRAM; 1983 error = getaddrinfo(f->f_un.f_forw.f_hname, 1984 p ? p : "syslog", &hints, &res); 1985 if (error) { 1986 logerror(gai_strerror(error)); 1987 break; 1988 } 1989 f->f_un.f_forw.f_addr = res; 1990 f->f_type = F_FORW; 1991 break; 1992 1993 case '/': 1994 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1995 f->f_type = F_UNUSED; 1996 logerror(p); 1997 break; 1998 } 1999 if (syncfile) 2000 f->f_flags |= FFLAG_SYNC; 2001 if (isatty(f->f_file)) { 2002 if (strcmp(p, ctty) == 0) 2003 f->f_type = F_CONSOLE; 2004 else 2005 f->f_type = F_TTY; 2006 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2007 sizeof(f->f_un.f_fname)); 2008 } else { 2009 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2010 f->f_type = F_FILE; 2011 } 2012 break; 2013 2014 case '|': 2015 f->f_un.f_pipe.f_pid = 0; 2016 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2017 sizeof(f->f_un.f_pipe.f_pname)); 2018 f->f_type = F_PIPE; 2019 break; 2020 2021 case '*': 2022 f->f_type = F_WALL; 2023 break; 2024 2025 default: 2026 for (i = 0; i < MAXUNAMES && *p; i++) { 2027 for (q = p; *q && *q != ','; ) 2028 q++; 2029 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2030 if ((q - p) >= MAXLOGNAME) 2031 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2032 else 2033 f->f_un.f_uname[i][q - p] = '\0'; 2034 while (*q == ',' || *q == ' ') 2035 q++; 2036 p = q; 2037 } 2038 f->f_type = F_USERS; 2039 break; 2040 } 2041} 2042 2043 2044/* 2045 * Decode a symbolic name to a numeric value 2046 */ 2047static int 2048decode(const char *name, const CODE *codetab) 2049{ 2050 const CODE *c; 2051 char *p, buf[40]; 2052 2053 if (isdigit(*name)) 2054 return (atoi(name)); 2055 2056 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2057 if (isupper(*name)) 2058 *p = tolower(*name); 2059 else 2060 *p = *name; 2061 } 2062 *p = '\0'; 2063 for (c = codetab; c->c_name; c++) 2064 if (!strcmp(buf, c->c_name)) 2065 return (c->c_val); 2066 2067 return (-1); 2068} 2069 2070static void 2071markit(void) 2072{ 2073 struct filed *f; 2074 dq_t q, next; 2075 2076 now = time((time_t *)NULL); 2077 MarkSeq += TIMERINTVL; 2078 if (MarkSeq >= MarkInterval) { 2079 logmsg(LOG_INFO, "-- MARK --", 2080 LocalHostName, ADDDATE|MARK); 2081 MarkSeq = 0; 2082 } 2083 2084 for (f = Files; f; f = f->f_next) { 2085 if (f->f_prevcount && now >= REPEATTIME(f)) { 2086 dprintf("flush %s: repeated %d times, %d sec.\n", 2087 TypeNames[f->f_type], f->f_prevcount, 2088 repeatinterval[f->f_repeatcount]); 2089 fprintlog(f, 0, (char *)NULL); 2090 BACKOFF(f); 2091 } 2092 } 2093 2094 /* Walk the dead queue, and see if we should signal somebody. */ 2095 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2096 next = TAILQ_NEXT(q, dq_entries); 2097 2098 switch (q->dq_timeout) { 2099 case 0: 2100 /* Already signalled once, try harder now. */ 2101 if (kill(q->dq_pid, SIGKILL) != 0) 2102 (void)deadq_remove(q->dq_pid); 2103 break; 2104 2105 case 1: 2106 /* 2107 * Timed out on dead queue, send terminate 2108 * signal. Note that we leave the removal 2109 * from the dead queue to reapchild(), which 2110 * will also log the event (unless the process 2111 * didn't even really exist, in case we simply 2112 * drop it from the dead queue). 2113 */ 2114 if (kill(q->dq_pid, SIGTERM) != 0) 2115 (void)deadq_remove(q->dq_pid); 2116 /* FALLTHROUGH */ 2117 2118 default: 2119 q->dq_timeout--; 2120 } 2121 } 2122 MarkSet = 0; 2123 (void)alarm(TIMERINTVL); 2124} 2125 2126/* 2127 * fork off and become a daemon, but wait for the child to come online 2128 * before returing to the parent, or we get disk thrashing at boot etc. 2129 * Set a timer so we don't hang forever if it wedges. 2130 */ 2131static int 2132waitdaemon(int nochdir, int noclose, int maxwait) 2133{ 2134 int fd; 2135 int status; 2136 pid_t pid, childpid; 2137 2138 switch (childpid = fork()) { 2139 case -1: 2140 return (-1); 2141 case 0: 2142 break; 2143 default: 2144 signal(SIGALRM, timedout); 2145 alarm(maxwait); 2146 while ((pid = wait3(&status, 0, NULL)) != -1) { 2147 if (WIFEXITED(status)) 2148 errx(1, "child pid %d exited with return code %d", 2149 pid, WEXITSTATUS(status)); 2150 if (WIFSIGNALED(status)) 2151 errx(1, "child pid %d exited on signal %d%s", 2152 pid, WTERMSIG(status), 2153 WCOREDUMP(status) ? " (core dumped)" : 2154 ""); 2155 if (pid == childpid) /* it's gone... */ 2156 break; 2157 } 2158 exit(0); 2159 } 2160 2161 if (setsid() == -1) 2162 return (-1); 2163 2164 if (!nochdir) 2165 (void)chdir("/"); 2166 2167 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2168 (void)dup2(fd, STDIN_FILENO); 2169 (void)dup2(fd, STDOUT_FILENO); 2170 (void)dup2(fd, STDERR_FILENO); 2171 if (fd > 2) 2172 (void)close (fd); 2173 } 2174 return (getppid()); 2175} 2176 2177/* 2178 * We get a SIGALRM from the child when it's running and finished doing it's 2179 * fsync()'s or O_SYNC writes for all the boot messages. 2180 * 2181 * We also get a signal from the kernel if the timer expires, so check to 2182 * see what happened. 2183 */ 2184static void 2185timedout(int sig __unused) 2186{ 2187 int left; 2188 left = alarm(0); 2189 signal(SIGALRM, SIG_DFL); 2190 if (left == 0) 2191 errx(1, "timed out waiting for child"); 2192 else 2193 _exit(0); 2194} 2195 2196/* 2197 * Add `s' to the list of allowable peer addresses to accept messages 2198 * from. 2199 * 2200 * `s' is a string in the form: 2201 * 2202 * [*]domainname[:{servicename|portnumber|*}] 2203 * 2204 * or 2205 * 2206 * netaddr/maskbits[:{servicename|portnumber|*}] 2207 * 2208 * Returns -1 on error, 0 if the argument was valid. 2209 */ 2210static int 2211allowaddr(char *s) 2212{ 2213 char *cp1, *cp2; 2214 struct allowedpeer ap; 2215 struct servent *se; 2216 int masklen = -1; 2217 struct addrinfo hints, *res; 2218 struct in_addr *addrp, *maskp; 2219#ifdef INET6 2220 int i; 2221 u_int32_t *addr6p, *mask6p; 2222#endif 2223 char ip[NI_MAXHOST]; 2224 2225#ifdef INET6 2226 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2227#endif 2228 cp1 = s; 2229 if ((cp1 = strrchr(cp1, ':'))) { 2230 /* service/port provided */ 2231 *cp1++ = '\0'; 2232 if (strlen(cp1) == 1 && *cp1 == '*') 2233 /* any port allowed */ 2234 ap.port = 0; 2235 else if ((se = getservbyname(cp1, "udp"))) { 2236 ap.port = ntohs(se->s_port); 2237 } else { 2238 ap.port = strtol(cp1, &cp2, 0); 2239 if (*cp2 != '\0') 2240 return (-1); /* port not numeric */ 2241 } 2242 } else { 2243 if ((se = getservbyname("syslog", "udp"))) 2244 ap.port = ntohs(se->s_port); 2245 else 2246 /* sanity, should not happen */ 2247 ap.port = 514; 2248 } 2249 2250 if ((cp1 = strchr(s, '/')) != NULL && 2251 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2252 *cp1 = '\0'; 2253 if ((masklen = atoi(cp1 + 1)) < 0) 2254 return (-1); 2255 } 2256#ifdef INET6 2257 if (*s == '[') { 2258 cp2 = s + strlen(s) - 1; 2259 if (*cp2 == ']') { 2260 ++s; 2261 *cp2 = '\0'; 2262 } else { 2263 cp2 = NULL; 2264 } 2265 } else { 2266 cp2 = NULL; 2267 } 2268#endif 2269 memset(&hints, 0, sizeof(hints)); 2270 hints.ai_family = PF_UNSPEC; 2271 hints.ai_socktype = SOCK_DGRAM; 2272 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2273 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2274 ap.isnumeric = 1; 2275 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2276 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2277 ap.a_mask.ss_family = res->ai_family; 2278 if (res->ai_family == AF_INET) { 2279 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2280 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2281 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2282 if (masklen < 0) { 2283 /* use default netmask */ 2284 if (IN_CLASSA(ntohl(addrp->s_addr))) 2285 maskp->s_addr = htonl(IN_CLASSA_NET); 2286 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2287 maskp->s_addr = htonl(IN_CLASSB_NET); 2288 else 2289 maskp->s_addr = htonl(IN_CLASSC_NET); 2290 } else if (masklen <= 32) { 2291 /* convert masklen to netmask */ 2292 if (masklen == 0) 2293 maskp->s_addr = 0; 2294 else 2295 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2296 } else { 2297 freeaddrinfo(res); 2298 return (-1); 2299 } 2300 /* Lose any host bits in the network number. */ 2301 addrp->s_addr &= maskp->s_addr; 2302 } 2303#ifdef INET6 2304 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2305 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2306 if (masklen < 0) 2307 masklen = 128; 2308 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2309 /* convert masklen to netmask */ 2310 while (masklen > 0) { 2311 if (masklen < 32) { 2312 *mask6p = htonl(~(0xffffffff >> masklen)); 2313 break; 2314 } 2315 *mask6p++ = 0xffffffff; 2316 masklen -= 32; 2317 } 2318 /* Lose any host bits in the network number. */ 2319 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2320 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2321 for (i = 0; i < 4; i++) 2322 addr6p[i] &= mask6p[i]; 2323 } 2324#endif 2325 else { 2326 freeaddrinfo(res); 2327 return (-1); 2328 } 2329 freeaddrinfo(res); 2330 } else { 2331 /* arg `s' is domain name */ 2332 ap.isnumeric = 0; 2333 ap.a_name = s; 2334 if (cp1) 2335 *cp1 = '/'; 2336#ifdef INET6 2337 if (cp2) { 2338 *cp2 = ']'; 2339 --s; 2340 } 2341#endif 2342 } 2343 2344 if (Debug) { 2345 printf("allowaddr: rule %d: ", NumAllowed); 2346 if (ap.isnumeric) { 2347 printf("numeric, "); 2348 getnameinfo((struct sockaddr *)&ap.a_addr, 2349 ((struct sockaddr *)&ap.a_addr)->sa_len, 2350 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2351 printf("addr = %s, ", ip); 2352 getnameinfo((struct sockaddr *)&ap.a_mask, 2353 ((struct sockaddr *)&ap.a_mask)->sa_len, 2354 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2355 printf("mask = %s; ", ip); 2356 } else { 2357 printf("domainname = %s; ", ap.a_name); 2358 } 2359 printf("port = %d\n", ap.port); 2360 } 2361 2362 if ((AllowedPeers = realloc(AllowedPeers, 2363 ++NumAllowed * sizeof(struct allowedpeer))) 2364 == NULL) { 2365 logerror("realloc"); 2366 exit(1); 2367 } 2368 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2369 return (0); 2370} 2371 2372/* 2373 * Validate that the remote peer has permission to log to us. 2374 */ 2375static int 2376validate(struct sockaddr *sa, const char *hname) 2377{ 2378 int i; 2379 size_t l1, l2; 2380 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2381 struct allowedpeer *ap; 2382 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2383#ifdef INET6 2384 int j, reject; 2385 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2386#endif 2387 struct addrinfo hints, *res; 2388 u_short sport; 2389 2390 if (NumAllowed == 0) 2391 /* traditional behaviour, allow everything */ 2392 return (1); 2393 2394 (void)strlcpy(name, hname, sizeof(name)); 2395 memset(&hints, 0, sizeof(hints)); 2396 hints.ai_family = PF_UNSPEC; 2397 hints.ai_socktype = SOCK_DGRAM; 2398 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2399 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2400 freeaddrinfo(res); 2401 else if (strchr(name, '.') == NULL) { 2402 strlcat(name, ".", sizeof name); 2403 strlcat(name, LocalDomain, sizeof name); 2404 } 2405 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2406 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2407 return (0); /* for safety, should not occur */ 2408 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2409 ip, port, name); 2410 sport = atoi(port); 2411 2412 /* now, walk down the list */ 2413 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2414 if (ap->port != 0 && ap->port != sport) { 2415 dprintf("rejected in rule %d due to port mismatch.\n", i); 2416 continue; 2417 } 2418 2419 if (ap->isnumeric) { 2420 if (ap->a_addr.ss_family != sa->sa_family) { 2421 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2422 continue; 2423 } 2424 if (ap->a_addr.ss_family == AF_INET) { 2425 sin4 = (struct sockaddr_in *)sa; 2426 a4p = (struct sockaddr_in *)&ap->a_addr; 2427 m4p = (struct sockaddr_in *)&ap->a_mask; 2428 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2429 != a4p->sin_addr.s_addr) { 2430 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2431 continue; 2432 } 2433 } 2434#ifdef INET6 2435 else if (ap->a_addr.ss_family == AF_INET6) { 2436 sin6 = (struct sockaddr_in6 *)sa; 2437 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2438 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2439 if (a6p->sin6_scope_id != 0 && 2440 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2441 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2442 continue; 2443 } 2444 reject = 0; 2445 for (j = 0; j < 16; j += 4) { 2446 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2447 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2448 ++reject; 2449 break; 2450 } 2451 } 2452 if (reject) { 2453 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2454 continue; 2455 } 2456 } 2457#endif 2458 else 2459 continue; 2460 } else { 2461 cp = ap->a_name; 2462 l1 = strlen(name); 2463 if (*cp == '*') { 2464 /* allow wildmatch */ 2465 cp++; 2466 l2 = strlen(cp); 2467 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2468 dprintf("rejected in rule %d due to name mismatch.\n", i); 2469 continue; 2470 } 2471 } else { 2472 /* exact match */ 2473 l2 = strlen(cp); 2474 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2475 dprintf("rejected in rule %d due to name mismatch.\n", i); 2476 continue; 2477 } 2478 } 2479 } 2480 dprintf("accepted in rule %d.\n", i); 2481 return (1); /* hooray! */ 2482 } 2483 return (0); 2484} 2485 2486/* 2487 * Fairly similar to popen(3), but returns an open descriptor, as 2488 * opposed to a FILE *. 2489 */ 2490static int 2491p_open(const char *prog, pid_t *rpid) 2492{ 2493 int pfd[2], nulldesc; 2494 pid_t pid; 2495 sigset_t omask, mask; 2496 char *argv[4]; /* sh -c cmd NULL */ 2497 char errmsg[200]; 2498 2499 if (pipe(pfd) == -1) 2500 return (-1); 2501 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2502 /* we are royally screwed anyway */ 2503 return (-1); 2504 2505 sigemptyset(&mask); 2506 sigaddset(&mask, SIGALRM); 2507 sigaddset(&mask, SIGHUP); 2508 sigprocmask(SIG_BLOCK, &mask, &omask); 2509 switch ((pid = fork())) { 2510 case -1: 2511 sigprocmask(SIG_SETMASK, &omask, 0); 2512 close(nulldesc); 2513 return (-1); 2514 2515 case 0: 2516 argv[0] = strdup("sh"); 2517 argv[1] = strdup("-c"); 2518 argv[2] = strdup(prog); 2519 argv[3] = NULL; 2520 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2521 logerror("strdup"); 2522 exit(1); 2523 } 2524 2525 alarm(0); 2526 (void)setsid(); /* Avoid catching SIGHUPs. */ 2527 2528 /* 2529 * Throw away pending signals, and reset signal 2530 * behaviour to standard values. 2531 */ 2532 signal(SIGALRM, SIG_IGN); 2533 signal(SIGHUP, SIG_IGN); 2534 sigprocmask(SIG_SETMASK, &omask, 0); 2535 signal(SIGPIPE, SIG_DFL); 2536 signal(SIGQUIT, SIG_DFL); 2537 signal(SIGALRM, SIG_DFL); 2538 signal(SIGHUP, SIG_DFL); 2539 2540 dup2(pfd[0], STDIN_FILENO); 2541 dup2(nulldesc, STDOUT_FILENO); 2542 dup2(nulldesc, STDERR_FILENO); 2543 closefrom(3); 2544 2545 (void)execvp(_PATH_BSHELL, argv); 2546 _exit(255); 2547 } 2548 2549 sigprocmask(SIG_SETMASK, &omask, 0); 2550 close(nulldesc); 2551 close(pfd[0]); 2552 /* 2553 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2554 * supposed to get an EWOULDBLOCK on writev(2), which is 2555 * caught by the logic above anyway, which will in turn close 2556 * the pipe, and fork a new logging subprocess if necessary. 2557 * The stale subprocess will be killed some time later unless 2558 * it terminated itself due to closing its input pipe (so we 2559 * get rid of really dead puppies). 2560 */ 2561 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2562 /* This is bad. */ 2563 (void)snprintf(errmsg, sizeof errmsg, 2564 "Warning: cannot change pipe to PID %d to " 2565 "non-blocking behaviour.", 2566 (int)pid); 2567 logerror(errmsg); 2568 } 2569 *rpid = pid; 2570 return (pfd[1]); 2571} 2572 2573static void 2574deadq_enter(pid_t pid, const char *name) 2575{ 2576 dq_t p; 2577 int status; 2578 2579 /* 2580 * Be paranoid, if we can't signal the process, don't enter it 2581 * into the dead queue (perhaps it's already dead). If possible, 2582 * we try to fetch and log the child's status. 2583 */ 2584 if (kill(pid, 0) != 0) { 2585 if (waitpid(pid, &status, WNOHANG) > 0) 2586 log_deadchild(pid, status, name); 2587 return; 2588 } 2589 2590 p = malloc(sizeof(struct deadq_entry)); 2591 if (p == NULL) { 2592 logerror("malloc"); 2593 exit(1); 2594 } 2595 2596 p->dq_pid = pid; 2597 p->dq_timeout = DQ_TIMO_INIT; 2598 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2599} 2600 2601static int 2602deadq_remove(pid_t pid) 2603{ 2604 dq_t q; 2605 2606 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2607 if (q->dq_pid == pid) { 2608 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2609 free(q); 2610 return (1); 2611 } 2612 } 2613 2614 return (0); 2615} 2616 2617static void 2618log_deadchild(pid_t pid, int status, const char *name) 2619{ 2620 int code; 2621 char buf[256]; 2622 const char *reason; 2623 2624 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2625 if (WIFSIGNALED(status)) { 2626 reason = "due to signal"; 2627 code = WTERMSIG(status); 2628 } else { 2629 reason = "with status"; 2630 code = WEXITSTATUS(status); 2631 if (code == 0) 2632 return; 2633 } 2634 (void)snprintf(buf, sizeof buf, 2635 "Logging subprocess %d (%s) exited %s %d.", 2636 pid, name, reason, code); 2637 logerror(buf); 2638} 2639 2640static int * 2641socksetup(int af, char *bindhostname) 2642{ 2643 struct addrinfo hints, *res, *r; 2644 const char *bindservice; 2645 char *cp; 2646 int error, maxs, *s, *socks; 2647 2648 /* 2649 * We have to handle this case for backwards compatibility: 2650 * If there are two (or more) colons but no '[' and ']', 2651 * assume this is an inet6 address without a service. 2652 */ 2653 bindservice = "syslog"; 2654 if (bindhostname != NULL) { 2655#ifdef INET6 2656 if (*bindhostname == '[' && 2657 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2658 ++bindhostname; 2659 *cp = '\0'; 2660 if (cp[1] == ':' && cp[2] != '\0') 2661 bindservice = cp + 2; 2662 } else { 2663#endif 2664 cp = strchr(bindhostname, ':'); 2665 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2666 *cp = '\0'; 2667 if (cp[1] != '\0') 2668 bindservice = cp + 1; 2669 if (cp == bindhostname) 2670 bindhostname = NULL; 2671 } 2672#ifdef INET6 2673 } 2674#endif 2675 } 2676 2677 memset(&hints, 0, sizeof(hints)); 2678 hints.ai_flags = AI_PASSIVE; 2679 hints.ai_family = af; 2680 hints.ai_socktype = SOCK_DGRAM; 2681 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2682 if (error) { 2683 logerror(gai_strerror(error)); 2684 errno = 0; 2685 die(0); 2686 } 2687 2688 /* Count max number of sockets we may open */ 2689 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2690 socks = malloc((maxs+1) * sizeof(int)); 2691 if (socks == NULL) { 2692 logerror("couldn't allocate memory for sockets"); 2693 die(0); 2694 } 2695 2696 *socks = 0; /* num of sockets counter at start of array */ 2697 s = socks + 1; 2698 for (r = res; r; r = r->ai_next) { 2699 int on = 1; 2700 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2701 if (*s < 0) { 2702 logerror("socket"); 2703 continue; 2704 } 2705#ifdef INET6 2706 if (r->ai_family == AF_INET6) { 2707 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2708 (char *)&on, sizeof (on)) < 0) { 2709 logerror("setsockopt"); 2710 close(*s); 2711 continue; 2712 } 2713 } 2714#endif 2715 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2716 (char *)&on, sizeof (on)) < 0) { 2717 logerror("setsockopt"); 2718 close(*s); 2719 continue; 2720 } 2721 /* 2722 * RFC 3164 recommends that client side message 2723 * should come from the privileged syslogd port. 2724 * 2725 * If the system administrator choose not to obey 2726 * this, we can skip the bind() step so that the 2727 * system will choose a port for us. 2728 */ 2729 if (!NoBind) { 2730 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2731 logerror("bind"); 2732 close(*s); 2733 continue; 2734 } 2735 2736 if (!SecureMode) 2737 increase_rcvbuf(*s); 2738 } 2739 2740 (*socks)++; 2741 s++; 2742 } 2743 2744 if (*socks == 0) { 2745 free(socks); 2746 if (Debug) 2747 return (NULL); 2748 else 2749 die(0); 2750 } 2751 if (res) 2752 freeaddrinfo(res); 2753 2754 return (socks); 2755} 2756 2757static void 2758increase_rcvbuf(int fd) 2759{ 2760 socklen_t len, slen; 2761 2762 slen = sizeof(len); 2763 2764 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2765 if (len < RCVBUF_MINSIZE) { 2766 len = RCVBUF_MINSIZE; 2767 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2768 } 2769 } 2770} 2771