syslogd.c revision 293462
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 293462 2016-01-09 05:02:35Z rpokala $"); 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 Foreground = 0; /* Run in foreground, instead of daemonizing */ 275static int resolve = 1; /* resolve hostname */ 276static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 277static const char *LocalDomain; /* our local domain name */ 278static int *finet; /* Internet datagram socket */ 279static int fklog = -1; /* /dev/klog */ 280static int Initialized; /* set when we have initialized ourselves */ 281static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 282static int MarkSeq; /* mark sequence number */ 283static int NoBind; /* don't bind() as suggested by RFC 3164 */ 284static int SecureMode; /* when true, receive only unix domain socks */ 285#ifdef INET6 286static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 287#else 288static int family = PF_INET; /* protocol family (IPv4 only) */ 289#endif 290static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 291static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 292static int use_bootfile; /* log entire bootfile for every kern msg */ 293static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 294static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 295 296static char bootfile[MAXLINE+1]; /* booted kernel file */ 297 298struct allowedpeer *AllowedPeers; /* List of allowed peers */ 299static int NumAllowed; /* Number of entries in AllowedPeers */ 300static int RemoteAddDate; /* Always set the date on remote messages */ 301 302static int UniquePriority; /* Only log specified priority? */ 303static int LogFacPri; /* Put facility and priority in log message: */ 304 /* 0=no, 1=numeric, 2=names */ 305static int KeepKernFac; /* Keep remotely logged kernel facility */ 306static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 307static struct pidfh *pfh; 308 309volatile sig_atomic_t MarkSet, WantDie; 310 311static int allowaddr(char *); 312static void cfline(const char *, struct filed *, 313 const char *, const char *); 314static const char *cvthname(struct sockaddr *); 315static void deadq_enter(pid_t, const char *); 316static int deadq_remove(pid_t); 317static int decode(const char *, const CODE *); 318static void die(int); 319static void dodie(int); 320static void dofsync(void); 321static void domark(int); 322static void fprintlog(struct filed *, int, const char *); 323static int *socksetup(int, char *); 324static void init(int); 325static void logerror(const char *); 326static void logmsg(int, const char *, const char *, int); 327static void log_deadchild(pid_t, int, const char *); 328static void markit(void); 329static int skip_message(const char *, const char *, int); 330static void printline(const char *, char *, int); 331static void printsys(char *); 332static int p_open(const char *, pid_t *); 333static void readklog(void); 334static void reapchild(int); 335static void usage(void); 336static int validate(struct sockaddr *, const char *); 337static void unmapped(struct sockaddr *); 338static void wallmsg(struct filed *, struct iovec *, const int iovlen); 339static int waitdaemon(int, int, int); 340static void timedout(int); 341static void increase_rcvbuf(int); 342 343static void 344close_filed(struct filed *f) 345{ 346 347 if (f == NULL || f->f_file == -1) 348 return; 349 350 (void)close(f->f_file); 351 f->f_file = -1; 352 f->f_type = F_UNUSED; 353} 354 355int 356main(int argc, char *argv[]) 357{ 358 int ch, i, fdsrmax = 0, l; 359 struct sockaddr_un sunx, fromunix; 360 struct sockaddr_storage frominet; 361 fd_set *fdsr = NULL; 362 char line[MAXLINE + 1]; 363 char *bindhostname; 364 const char *hname; 365 struct timeval tv, *tvp; 366 struct sigaction sact; 367 struct funix *fx, *fx1; 368 sigset_t mask; 369 pid_t ppid = 1, spid; 370 socklen_t len; 371 372 if (madvise(NULL, 0, MADV_PROTECT) != 0) 373 dprintf("madvise() failed: %s\n", strerror(errno)); 374 375 bindhostname = NULL; 376 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 377 != -1) 378 switch (ch) { 379 case '4': 380 family = PF_INET; 381 break; 382#ifdef INET6 383 case '6': 384 family = PF_INET6; 385 break; 386#endif 387 case '8': 388 mask_C1 = 0; 389 break; 390 case 'A': 391 send_to_all++; 392 break; 393 case 'a': /* allow specific network addresses only */ 394 if (allowaddr(optarg) == -1) 395 usage(); 396 break; 397 case 'b': 398 bindhostname = optarg; 399 break; 400 case 'c': 401 no_compress++; 402 break; 403 case 'C': 404 logflags |= O_CREAT; 405 break; 406 case 'd': /* debug */ 407 Debug++; 408 break; 409 case 'f': /* configuration file */ 410 ConfFile = optarg; 411 break; 412 case 'F': /* run in foreground instead of daemon */ 413 Foreground++; 414 break; 415 case 'k': /* keep remote kern fac */ 416 KeepKernFac = 1; 417 break; 418 case 'l': 419 { 420 long perml; 421 mode_t mode; 422 char *name, *ep; 423 424 if (optarg[0] == '/') { 425 mode = DEFFILEMODE; 426 name = optarg; 427 } else if ((name = strchr(optarg, ':')) != NULL) { 428 *name++ = '\0'; 429 if (name[0] != '/') 430 errx(1, "socket name must be absolute " 431 "path"); 432 if (isdigit(*optarg)) { 433 perml = strtol(optarg, &ep, 8); 434 if (*ep || perml < 0 || 435 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 436 errx(1, "invalid mode %s, exiting", 437 optarg); 438 mode = (mode_t )perml; 439 } else 440 errx(1, "invalid mode %s, exiting", 441 optarg); 442 } else /* doesn't begin with '/', and no ':' */ 443 errx(1, "can't parse path %s", optarg); 444 445 if (strlen(name) >= sizeof(sunx.sun_path)) 446 errx(1, "%s path too long, exiting", name); 447 if ((fx = malloc(sizeof(struct funix))) == NULL) 448 errx(1, "malloc failed"); 449 fx->s = -1; 450 fx->name = name; 451 fx->mode = mode; 452 STAILQ_INSERT_TAIL(&funixes, fx, next); 453 break; 454 } 455 case 'm': /* mark interval */ 456 MarkInterval = atoi(optarg) * 60; 457 break; 458 case 'N': 459 NoBind = 1; 460 SecureMode = 1; 461 break; 462 case 'n': 463 resolve = 0; 464 break; 465 case 'o': 466 use_bootfile = 1; 467 break; 468 case 'p': /* path */ 469 if (strlen(optarg) >= sizeof(sunx.sun_path)) 470 errx(1, "%s path too long, exiting", optarg); 471 funix_default.name = optarg; 472 break; 473 case 'P': /* path for alt. PID */ 474 PidFile = optarg; 475 break; 476 case 's': /* no network mode */ 477 SecureMode++; 478 break; 479 case 'S': /* path for privileged originator */ 480 if (strlen(optarg) >= sizeof(sunx.sun_path)) 481 errx(1, "%s path too long, exiting", optarg); 482 funix_secure.name = optarg; 483 break; 484 case 'T': 485 RemoteAddDate = 1; 486 break; 487 case 'u': /* only log specified priority */ 488 UniquePriority++; 489 break; 490 case 'v': /* log facility and priority */ 491 LogFacPri++; 492 break; 493 default: 494 usage(); 495 } 496 if ((argc -= optind) != 0) 497 usage(); 498 499 pfh = pidfile_open(PidFile, 0600, &spid); 500 if (pfh == NULL) { 501 if (errno == EEXIST) 502 errx(1, "syslogd already running, pid: %d", spid); 503 warn("cannot open pid file"); 504 } 505 506 if ((!Foreground) && (!Debug)) { 507 ppid = waitdaemon(0, 0, 30); 508 if (ppid < 0) { 509 warn("could not become daemon"); 510 pidfile_remove(pfh); 511 exit(1); 512 } 513 } else if (Debug) { 514 setlinebuf(stdout); 515 } 516 517 if (NumAllowed) 518 endservent(); 519 520 consfile.f_type = F_CONSOLE; 521 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 522 sizeof(consfile.f_un.f_fname)); 523 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 524 (void)signal(SIGTERM, dodie); 525 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 526 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 527 /* 528 * We don't want the SIGCHLD and SIGHUP handlers to interfere 529 * with each other; they are likely candidates for being called 530 * simultaneously (SIGHUP closes pipe descriptor, process dies, 531 * SIGCHLD happens). 532 */ 533 sigemptyset(&mask); 534 sigaddset(&mask, SIGHUP); 535 sact.sa_handler = reapchild; 536 sact.sa_mask = mask; 537 sact.sa_flags = SA_RESTART; 538 (void)sigaction(SIGCHLD, &sact, NULL); 539 (void)signal(SIGALRM, domark); 540 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 541 (void)alarm(TIMERINTVL); 542 543 TAILQ_INIT(&deadq_head); 544 545#ifndef SUN_LEN 546#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 547#endif 548 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 549 (void)unlink(fx->name); 550 memset(&sunx, 0, sizeof(sunx)); 551 sunx.sun_family = AF_LOCAL; 552 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 553 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 554 if (fx->s < 0 || 555 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 556 chmod(fx->name, fx->mode) < 0) { 557 (void)snprintf(line, sizeof line, 558 "cannot create %s", fx->name); 559 logerror(line); 560 dprintf("cannot create %s (%d)\n", fx->name, errno); 561 if (fx == &funix_default || fx == &funix_secure) 562 die(0); 563 else { 564 STAILQ_REMOVE(&funixes, fx, funix, next); 565 continue; 566 } 567 } 568 increase_rcvbuf(fx->s); 569 } 570 if (SecureMode <= 1) 571 finet = socksetup(family, bindhostname); 572 573 if (finet) { 574 if (SecureMode) { 575 for (i = 0; i < *finet; i++) { 576 if (shutdown(finet[i+1], SHUT_RD) < 0 && 577 errno != ENOTCONN) { 578 logerror("shutdown"); 579 if (!Debug) 580 die(0); 581 } 582 } 583 } else { 584 dprintf("listening on inet and/or inet6 socket\n"); 585 } 586 dprintf("sending on inet and/or inet6 socket\n"); 587 } 588 589 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 590 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 591 fklog = -1; 592 if (fklog < 0) 593 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 594 595 /* tuck my process id away */ 596 pidfile_write(pfh); 597 598 dprintf("off & running....\n"); 599 600 init(0); 601 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 602 sigemptyset(&mask); 603 sigaddset(&mask, SIGCHLD); 604 sact.sa_handler = init; 605 sact.sa_mask = mask; 606 sact.sa_flags = SA_RESTART; 607 (void)sigaction(SIGHUP, &sact, NULL); 608 609 tvp = &tv; 610 tv.tv_sec = tv.tv_usec = 0; 611 612 if (fklog != -1 && fklog > fdsrmax) 613 fdsrmax = fklog; 614 if (finet && !SecureMode) { 615 for (i = 0; i < *finet; i++) { 616 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 617 fdsrmax = finet[i+1]; 618 } 619 } 620 STAILQ_FOREACH(fx, &funixes, next) 621 if (fx->s > fdsrmax) 622 fdsrmax = fx->s; 623 624 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 625 sizeof(fd_mask)); 626 if (fdsr == NULL) 627 errx(1, "calloc fd_set"); 628 629 for (;;) { 630 if (MarkSet) 631 markit(); 632 if (WantDie) 633 die(WantDie); 634 635 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 636 sizeof(fd_mask)); 637 638 if (fklog != -1) 639 FD_SET(fklog, fdsr); 640 if (finet && !SecureMode) { 641 for (i = 0; i < *finet; i++) { 642 if (finet[i+1] != -1) 643 FD_SET(finet[i+1], fdsr); 644 } 645 } 646 STAILQ_FOREACH(fx, &funixes, next) 647 FD_SET(fx->s, fdsr); 648 649 i = select(fdsrmax+1, fdsr, NULL, NULL, 650 needdofsync ? &tv : tvp); 651 switch (i) { 652 case 0: 653 dofsync(); 654 needdofsync = 0; 655 if (tvp) { 656 tvp = NULL; 657 if (ppid != 1) 658 kill(ppid, SIGALRM); 659 } 660 continue; 661 case -1: 662 if (errno != EINTR) 663 logerror("select"); 664 continue; 665 } 666 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 667 readklog(); 668 if (finet && !SecureMode) { 669 for (i = 0; i < *finet; i++) { 670 if (FD_ISSET(finet[i+1], fdsr)) { 671 len = sizeof(frominet); 672 l = recvfrom(finet[i+1], line, MAXLINE, 673 0, (struct sockaddr *)&frominet, 674 &len); 675 if (l > 0) { 676 line[l] = '\0'; 677 hname = cvthname((struct sockaddr *)&frominet); 678 unmapped((struct sockaddr *)&frominet); 679 if (validate((struct sockaddr *)&frominet, hname)) 680 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 681 } else if (l < 0 && errno != EINTR) 682 logerror("recvfrom inet"); 683 } 684 } 685 } 686 STAILQ_FOREACH(fx, &funixes, next) { 687 if (FD_ISSET(fx->s, fdsr)) { 688 len = sizeof(fromunix); 689 l = recvfrom(fx->s, line, MAXLINE, 0, 690 (struct sockaddr *)&fromunix, &len); 691 if (l > 0) { 692 line[l] = '\0'; 693 printline(LocalHostName, line, 0); 694 } else if (l < 0 && errno != EINTR) 695 logerror("recvfrom unix"); 696 } 697 } 698 } 699 if (fdsr) 700 free(fdsr); 701} 702 703static void 704unmapped(struct sockaddr *sa) 705{ 706 struct sockaddr_in6 *sin6; 707 struct sockaddr_in sin4; 708 709 if (sa->sa_family != AF_INET6) 710 return; 711 if (sa->sa_len != sizeof(struct sockaddr_in6) || 712 sizeof(sin4) > sa->sa_len) 713 return; 714 sin6 = (struct sockaddr_in6 *)sa; 715 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 716 return; 717 718 memset(&sin4, 0, sizeof(sin4)); 719 sin4.sin_family = AF_INET; 720 sin4.sin_len = sizeof(struct sockaddr_in); 721 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 722 sizeof(sin4.sin_addr)); 723 sin4.sin_port = sin6->sin6_port; 724 725 memcpy(sa, &sin4, sin4.sin_len); 726} 727 728static void 729usage(void) 730{ 731 732 fprintf(stderr, "%s\n%s\n%s\n%s\n", 733 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 734 " [-b bind_address] [-f config_file]", 735 " [-l [mode:]path] [-m mark_interval]", 736 " [-P pid_file] [-p log_socket]"); 737 exit(1); 738} 739 740/* 741 * Take a raw input line, decode the message, and print the message 742 * on the appropriate log files. 743 */ 744static void 745printline(const char *hname, char *msg, int flags) 746{ 747 char *p, *q; 748 long n; 749 int c, pri; 750 char line[MAXLINE + 1]; 751 752 /* test for special codes */ 753 p = msg; 754 pri = DEFUPRI; 755 if (*p == '<') { 756 errno = 0; 757 n = strtol(p + 1, &q, 10); 758 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 759 p = q + 1; 760 pri = n; 761 } 762 } 763 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 764 pri = DEFUPRI; 765 766 /* 767 * Don't allow users to log kernel messages. 768 * NOTE: since LOG_KERN == 0 this will also match 769 * messages with no facility specified. 770 */ 771 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 772 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 773 774 q = line; 775 776 while ((c = (unsigned char)*p++) != '\0' && 777 q < &line[sizeof(line) - 4]) { 778 if (mask_C1 && (c & 0x80) && c < 0xA0) { 779 c &= 0x7F; 780 *q++ = 'M'; 781 *q++ = '-'; 782 } 783 if (isascii(c) && iscntrl(c)) { 784 if (c == '\n') { 785 *q++ = ' '; 786 } else if (c == '\t') { 787 *q++ = '\t'; 788 } else { 789 *q++ = '^'; 790 *q++ = c ^ 0100; 791 } 792 } else { 793 *q++ = c; 794 } 795 } 796 *q = '\0'; 797 798 logmsg(pri, line, hname, flags); 799} 800 801/* 802 * Read /dev/klog while data are available, split into lines. 803 */ 804static void 805readklog(void) 806{ 807 char *p, *q, line[MAXLINE + 1]; 808 int len, i; 809 810 len = 0; 811 for (;;) { 812 i = read(fklog, line + len, MAXLINE - 1 - len); 813 if (i > 0) { 814 line[i + len] = '\0'; 815 } else { 816 if (i < 0 && errno != EINTR && errno != EAGAIN) { 817 logerror("klog"); 818 fklog = -1; 819 } 820 break; 821 } 822 823 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 824 *q = '\0'; 825 printsys(p); 826 } 827 len = strlen(p); 828 if (len >= MAXLINE - 1) { 829 printsys(p); 830 len = 0; 831 } 832 if (len > 0) 833 memmove(line, p, len + 1); 834 } 835 if (len > 0) 836 printsys(line); 837} 838 839/* 840 * Take a raw input line from /dev/klog, format similar to syslog(). 841 */ 842static void 843printsys(char *msg) 844{ 845 char *p, *q; 846 long n; 847 int flags, isprintf, pri; 848 849 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 850 p = msg; 851 pri = DEFSPRI; 852 isprintf = 1; 853 if (*p == '<') { 854 errno = 0; 855 n = strtol(p + 1, &q, 10); 856 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 857 p = q + 1; 858 pri = n; 859 isprintf = 0; 860 } 861 } 862 /* 863 * Kernel printf's and LOG_CONSOLE messages have been displayed 864 * on the console already. 865 */ 866 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 867 flags |= IGN_CONS; 868 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 869 pri = DEFSPRI; 870 logmsg(pri, p, LocalHostName, flags); 871} 872 873static time_t now; 874 875/* 876 * Match a program or host name against a specification. 877 * Return a non-0 value if the message must be ignored 878 * based on the specification. 879 */ 880static int 881skip_message(const char *name, const char *spec, int checkcase) 882{ 883 const char *s; 884 char prev, next; 885 int exclude = 0; 886 /* Behaviour on explicit match */ 887 888 if (spec == NULL) 889 return 0; 890 switch (*spec) { 891 case '-': 892 exclude = 1; 893 /*FALLTHROUGH*/ 894 case '+': 895 spec++; 896 break; 897 default: 898 break; 899 } 900 if (checkcase) 901 s = strstr (spec, name); 902 else 903 s = strcasestr (spec, name); 904 905 if (s != NULL) { 906 prev = (s == spec ? ',' : *(s - 1)); 907 next = *(s + strlen (name)); 908 909 if (prev == ',' && (next == '\0' || next == ',')) 910 /* Explicit match: skip iff the spec is an 911 exclusive one. */ 912 return exclude; 913 } 914 915 /* No explicit match for this name: skip the message iff 916 the spec is an inclusive one. */ 917 return !exclude; 918} 919 920/* 921 * Log a message to the appropriate log files, users, etc. based on 922 * the priority. 923 */ 924static void 925logmsg(int pri, const char *msg, const char *from, int flags) 926{ 927 struct filed *f; 928 int i, fac, msglen, omask, prilev; 929 const char *timestamp; 930 char prog[NAME_MAX+1]; 931 char buf[MAXLINE+1]; 932 933 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 934 pri, flags, from, msg); 935 936 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 937 938 /* 939 * Check to see if msg looks non-standard. 940 */ 941 msglen = strlen(msg); 942 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 943 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 944 flags |= ADDDATE; 945 946 (void)time(&now); 947 if (flags & ADDDATE) { 948 timestamp = ctime(&now) + 4; 949 } else { 950 timestamp = msg; 951 msg += 16; 952 msglen -= 16; 953 } 954 955 /* skip leading blanks */ 956 while (isspace(*msg)) { 957 msg++; 958 msglen--; 959 } 960 961 /* extract facility and priority level */ 962 if (flags & MARK) 963 fac = LOG_NFACILITIES; 964 else 965 fac = LOG_FAC(pri); 966 967 /* Check maximum facility number. */ 968 if (fac > LOG_NFACILITIES) { 969 (void)sigsetmask(omask); 970 return; 971 } 972 973 prilev = LOG_PRI(pri); 974 975 /* extract program name */ 976 for (i = 0; i < NAME_MAX; i++) { 977 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 978 msg[i] == '/' || isspace(msg[i])) 979 break; 980 prog[i] = msg[i]; 981 } 982 prog[i] = 0; 983 984 /* add kernel prefix for kernel messages */ 985 if (flags & ISKERNEL) { 986 snprintf(buf, sizeof(buf), "%s: %s", 987 use_bootfile ? bootfile : "kernel", msg); 988 msg = buf; 989 msglen = strlen(buf); 990 } 991 992 /* log the message to the particular outputs */ 993 if (!Initialized) { 994 f = &consfile; 995 /* 996 * Open in non-blocking mode to avoid hangs during open 997 * and close(waiting for the port to drain). 998 */ 999 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1000 1001 if (f->f_file >= 0) { 1002 (void)strlcpy(f->f_lasttime, timestamp, 1003 sizeof(f->f_lasttime)); 1004 fprintlog(f, flags, msg); 1005 close(f->f_file); 1006 f->f_file = -1; 1007 } 1008 (void)sigsetmask(omask); 1009 return; 1010 } 1011 for (f = Files; f; f = f->f_next) { 1012 /* skip messages that are incorrect priority */ 1013 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1014 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1015 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1016 ) 1017 || f->f_pmask[fac] == INTERNAL_NOPRI) 1018 continue; 1019 1020 /* skip messages with the incorrect hostname */ 1021 if (skip_message(from, f->f_host, 0)) 1022 continue; 1023 1024 /* skip messages with the incorrect program name */ 1025 if (skip_message(prog, f->f_program, 1)) 1026 continue; 1027 1028 /* skip message to console if it has already been printed */ 1029 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1030 continue; 1031 1032 /* don't output marks to recently written files */ 1033 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1034 continue; 1035 1036 /* 1037 * suppress duplicate lines to this file 1038 */ 1039 if (no_compress - (f->f_type != F_PIPE) < 1 && 1040 (flags & MARK) == 0 && msglen == f->f_prevlen && 1041 !strcmp(msg, f->f_prevline) && 1042 !strcasecmp(from, f->f_prevhost)) { 1043 (void)strlcpy(f->f_lasttime, timestamp, 1044 sizeof(f->f_lasttime)); 1045 f->f_prevcount++; 1046 dprintf("msg repeated %d times, %ld sec of %d\n", 1047 f->f_prevcount, (long)(now - f->f_time), 1048 repeatinterval[f->f_repeatcount]); 1049 /* 1050 * If domark would have logged this by now, 1051 * flush it now (so we don't hold isolated messages), 1052 * but back off so we'll flush less often 1053 * in the future. 1054 */ 1055 if (now > REPEATTIME(f)) { 1056 fprintlog(f, flags, (char *)NULL); 1057 BACKOFF(f); 1058 } 1059 } else { 1060 /* new line, save it */ 1061 if (f->f_prevcount) 1062 fprintlog(f, 0, (char *)NULL); 1063 f->f_repeatcount = 0; 1064 f->f_prevpri = pri; 1065 (void)strlcpy(f->f_lasttime, timestamp, 1066 sizeof(f->f_lasttime)); 1067 (void)strlcpy(f->f_prevhost, from, 1068 sizeof(f->f_prevhost)); 1069 if (msglen < MAXSVLINE) { 1070 f->f_prevlen = msglen; 1071 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1072 fprintlog(f, flags, (char *)NULL); 1073 } else { 1074 f->f_prevline[0] = 0; 1075 f->f_prevlen = 0; 1076 fprintlog(f, flags, msg); 1077 } 1078 } 1079 } 1080 (void)sigsetmask(omask); 1081} 1082 1083static void 1084dofsync(void) 1085{ 1086 struct filed *f; 1087 1088 for (f = Files; f; f = f->f_next) { 1089 if ((f->f_type == F_FILE) && 1090 (f->f_flags & FFLAG_NEEDSYNC)) { 1091 f->f_flags &= ~FFLAG_NEEDSYNC; 1092 (void)fsync(f->f_file); 1093 } 1094 } 1095} 1096 1097#define IOV_SIZE 7 1098static void 1099fprintlog(struct filed *f, int flags, const char *msg) 1100{ 1101 struct iovec iov[IOV_SIZE]; 1102 struct iovec *v; 1103 struct addrinfo *r; 1104 int i, l, lsent = 0; 1105 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1106 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1107 const char *msgret; 1108 1109 v = iov; 1110 if (f->f_type == F_WALL) { 1111 v->iov_base = greetings; 1112 /* The time displayed is not synchornized with the other log 1113 * destinations (like messages). Following fragment was using 1114 * ctime(&now), which was updating the time every 30 sec. 1115 * With f_lasttime, time is synchronized correctly. 1116 */ 1117 v->iov_len = snprintf(greetings, sizeof greetings, 1118 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1119 f->f_prevhost, f->f_lasttime); 1120 if (v->iov_len >= sizeof greetings) 1121 v->iov_len = sizeof greetings - 1; 1122 v++; 1123 v->iov_base = nul; 1124 v->iov_len = 0; 1125 v++; 1126 } else { 1127 v->iov_base = f->f_lasttime; 1128 v->iov_len = strlen(f->f_lasttime); 1129 v++; 1130 v->iov_base = space; 1131 v->iov_len = 1; 1132 v++; 1133 } 1134 1135 if (LogFacPri) { 1136 static char fp_buf[30]; /* Hollow laugh */ 1137 int fac = f->f_prevpri & LOG_FACMASK; 1138 int pri = LOG_PRI(f->f_prevpri); 1139 const char *f_s = NULL; 1140 char f_n[5]; /* Hollow laugh */ 1141 const char *p_s = NULL; 1142 char p_n[5]; /* Hollow laugh */ 1143 1144 if (LogFacPri > 1) { 1145 const CODE *c; 1146 1147 for (c = facilitynames; c->c_name; c++) { 1148 if (c->c_val == fac) { 1149 f_s = c->c_name; 1150 break; 1151 } 1152 } 1153 for (c = prioritynames; c->c_name; c++) { 1154 if (c->c_val == pri) { 1155 p_s = c->c_name; 1156 break; 1157 } 1158 } 1159 } 1160 if (!f_s) { 1161 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1162 f_s = f_n; 1163 } 1164 if (!p_s) { 1165 snprintf(p_n, sizeof p_n, "%d", pri); 1166 p_s = p_n; 1167 } 1168 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1169 v->iov_base = fp_buf; 1170 v->iov_len = strlen(fp_buf); 1171 } else { 1172 v->iov_base = nul; 1173 v->iov_len = 0; 1174 } 1175 v++; 1176 1177 v->iov_base = f->f_prevhost; 1178 v->iov_len = strlen(v->iov_base); 1179 v++; 1180 v->iov_base = space; 1181 v->iov_len = 1; 1182 v++; 1183 1184 if (msg) { 1185 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1186 if (wmsg == NULL) { 1187 logerror("strdup"); 1188 exit(1); 1189 } 1190 v->iov_base = wmsg; 1191 v->iov_len = strlen(msg); 1192 } else if (f->f_prevcount > 1) { 1193 v->iov_base = repbuf; 1194 v->iov_len = snprintf(repbuf, sizeof repbuf, 1195 "last message repeated %d times", f->f_prevcount); 1196 } else { 1197 v->iov_base = f->f_prevline; 1198 v->iov_len = f->f_prevlen; 1199 } 1200 v++; 1201 1202 dprintf("Logging to %s", TypeNames[f->f_type]); 1203 f->f_time = now; 1204 1205 switch (f->f_type) { 1206 int port; 1207 case F_UNUSED: 1208 dprintf("\n"); 1209 break; 1210 1211 case F_FORW: 1212 port = (int)ntohs(((struct sockaddr_in *) 1213 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1214 if (port != 514) { 1215 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1216 } else { 1217 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1218 } 1219 /* check for local vs remote messages */ 1220 if (strcasecmp(f->f_prevhost, LocalHostName)) 1221 l = snprintf(line, sizeof line - 1, 1222 "<%d>%.15s Forwarded from %s: %s", 1223 f->f_prevpri, (char *)iov[0].iov_base, 1224 f->f_prevhost, (char *)iov[5].iov_base); 1225 else 1226 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1227 f->f_prevpri, (char *)iov[0].iov_base, 1228 (char *)iov[5].iov_base); 1229 if (l < 0) 1230 l = 0; 1231 else if (l > MAXLINE) 1232 l = MAXLINE; 1233 1234 if (finet) { 1235 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1236 for (i = 0; i < *finet; i++) { 1237#if 0 1238 /* 1239 * should we check AF first, or just 1240 * trial and error? FWD 1241 */ 1242 if (r->ai_family == 1243 address_family_of(finet[i+1])) 1244#endif 1245 lsent = sendto(finet[i+1], line, l, 0, 1246 r->ai_addr, r->ai_addrlen); 1247 if (lsent == l) 1248 break; 1249 } 1250 if (lsent == l && !send_to_all) 1251 break; 1252 } 1253 dprintf("lsent/l: %d/%d\n", lsent, l); 1254 if (lsent != l) { 1255 int e = errno; 1256 logerror("sendto"); 1257 errno = e; 1258 switch (errno) { 1259 case ENOBUFS: 1260 case ENETDOWN: 1261 case ENETUNREACH: 1262 case EHOSTUNREACH: 1263 case EHOSTDOWN: 1264 case EADDRNOTAVAIL: 1265 break; 1266 /* case EBADF: */ 1267 /* case EACCES: */ 1268 /* case ENOTSOCK: */ 1269 /* case EFAULT: */ 1270 /* case EMSGSIZE: */ 1271 /* case EAGAIN: */ 1272 /* case ENOBUFS: */ 1273 /* case ECONNREFUSED: */ 1274 default: 1275 dprintf("removing entry: errno=%d\n", e); 1276 f->f_type = F_UNUSED; 1277 break; 1278 } 1279 } 1280 } 1281 break; 1282 1283 case F_FILE: 1284 dprintf(" %s\n", f->f_un.f_fname); 1285 v->iov_base = lf; 1286 v->iov_len = 1; 1287 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1288 /* 1289 * If writev(2) fails for potentially transient errors 1290 * like the filesystem being full, ignore it. 1291 * Otherwise remove this logfile from the list. 1292 */ 1293 if (errno != ENOSPC) { 1294 int e = errno; 1295 close_filed(f); 1296 errno = e; 1297 logerror(f->f_un.f_fname); 1298 } 1299 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1300 f->f_flags |= FFLAG_NEEDSYNC; 1301 needdofsync = 1; 1302 } 1303 break; 1304 1305 case F_PIPE: 1306 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1307 v->iov_base = lf; 1308 v->iov_len = 1; 1309 if (f->f_un.f_pipe.f_pid == 0) { 1310 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1311 &f->f_un.f_pipe.f_pid)) < 0) { 1312 f->f_type = F_UNUSED; 1313 logerror(f->f_un.f_pipe.f_pname); 1314 break; 1315 } 1316 } 1317 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1318 int e = errno; 1319 close_filed(f); 1320 if (f->f_un.f_pipe.f_pid > 0) 1321 deadq_enter(f->f_un.f_pipe.f_pid, 1322 f->f_un.f_pipe.f_pname); 1323 f->f_un.f_pipe.f_pid = 0; 1324 errno = e; 1325 logerror(f->f_un.f_pipe.f_pname); 1326 } 1327 break; 1328 1329 case F_CONSOLE: 1330 if (flags & IGN_CONS) { 1331 dprintf(" (ignored)\n"); 1332 break; 1333 } 1334 /* FALLTHROUGH */ 1335 1336 case F_TTY: 1337 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1338 v->iov_base = crlf; 1339 v->iov_len = 2; 1340 1341 errno = 0; /* ttymsg() only sometimes returns an errno */ 1342 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1343 f->f_type = F_UNUSED; 1344 logerror(msgret); 1345 } 1346 break; 1347 1348 case F_USERS: 1349 case F_WALL: 1350 dprintf("\n"); 1351 v->iov_base = crlf; 1352 v->iov_len = 2; 1353 wallmsg(f, iov, IOV_SIZE); 1354 break; 1355 } 1356 f->f_prevcount = 0; 1357 free(wmsg); 1358} 1359 1360/* 1361 * WALLMSG -- Write a message to the world at large 1362 * 1363 * Write the specified message to either the entire 1364 * world, or a list of approved users. 1365 */ 1366static void 1367wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1368{ 1369 static int reenter; /* avoid calling ourselves */ 1370 struct utmpx *ut; 1371 int i; 1372 const char *p; 1373 1374 if (reenter++) 1375 return; 1376 setutxent(); 1377 /* NOSTRICT */ 1378 while ((ut = getutxent()) != NULL) { 1379 if (ut->ut_type != USER_PROCESS) 1380 continue; 1381 if (f->f_type == F_WALL) { 1382 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1383 TTYMSGTIME)) != NULL) { 1384 errno = 0; /* already in msg */ 1385 logerror(p); 1386 } 1387 continue; 1388 } 1389 /* should we send the message to this user? */ 1390 for (i = 0; i < MAXUNAMES; i++) { 1391 if (!f->f_un.f_uname[i][0]) 1392 break; 1393 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1394 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1395 TTYMSGTIME)) != NULL) { 1396 errno = 0; /* already in msg */ 1397 logerror(p); 1398 } 1399 break; 1400 } 1401 } 1402 } 1403 endutxent(); 1404 reenter = 0; 1405} 1406 1407static void 1408reapchild(int signo __unused) 1409{ 1410 int status; 1411 pid_t pid; 1412 struct filed *f; 1413 1414 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1415 if (!Initialized) 1416 /* Don't tell while we are initting. */ 1417 continue; 1418 1419 /* First, look if it's a process from the dead queue. */ 1420 if (deadq_remove(pid)) 1421 goto oncemore; 1422 1423 /* Now, look in list of active processes. */ 1424 for (f = Files; f; f = f->f_next) 1425 if (f->f_type == F_PIPE && 1426 f->f_un.f_pipe.f_pid == pid) { 1427 close_filed(f); 1428 f->f_un.f_pipe.f_pid = 0; 1429 log_deadchild(pid, status, 1430 f->f_un.f_pipe.f_pname); 1431 break; 1432 } 1433 oncemore: 1434 continue; 1435 } 1436} 1437 1438/* 1439 * Return a printable representation of a host address. 1440 */ 1441static const char * 1442cvthname(struct sockaddr *f) 1443{ 1444 int error, hl; 1445 sigset_t omask, nmask; 1446 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1447 1448 error = getnameinfo((struct sockaddr *)f, 1449 ((struct sockaddr *)f)->sa_len, 1450 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1451 dprintf("cvthname(%s)\n", ip); 1452 1453 if (error) { 1454 dprintf("Malformed from address %s\n", gai_strerror(error)); 1455 return ("???"); 1456 } 1457 if (!resolve) 1458 return (ip); 1459 1460 sigemptyset(&nmask); 1461 sigaddset(&nmask, SIGHUP); 1462 sigprocmask(SIG_BLOCK, &nmask, &omask); 1463 error = getnameinfo((struct sockaddr *)f, 1464 ((struct sockaddr *)f)->sa_len, 1465 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1466 sigprocmask(SIG_SETMASK, &omask, NULL); 1467 if (error) { 1468 dprintf("Host name for your address (%s) unknown\n", ip); 1469 return (ip); 1470 } 1471 hl = strlen(hname); 1472 if (hl > 0 && hname[hl-1] == '.') 1473 hname[--hl] = '\0'; 1474 trimdomain(hname, hl); 1475 return (hname); 1476} 1477 1478static void 1479dodie(int signo) 1480{ 1481 1482 WantDie = signo; 1483} 1484 1485static void 1486domark(int signo __unused) 1487{ 1488 1489 MarkSet = 1; 1490} 1491 1492/* 1493 * Print syslogd errors some place. 1494 */ 1495static void 1496logerror(const char *type) 1497{ 1498 char buf[512]; 1499 static int recursed = 0; 1500 1501 /* If there's an error while trying to log an error, give up. */ 1502 if (recursed) 1503 return; 1504 recursed++; 1505 if (errno) 1506 (void)snprintf(buf, 1507 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1508 else 1509 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1510 errno = 0; 1511 dprintf("%s\n", buf); 1512 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1513 recursed--; 1514} 1515 1516static void 1517die(int signo) 1518{ 1519 struct filed *f; 1520 struct funix *fx; 1521 int was_initialized; 1522 char buf[100]; 1523 1524 was_initialized = Initialized; 1525 Initialized = 0; /* Don't log SIGCHLDs. */ 1526 for (f = Files; f != NULL; f = f->f_next) { 1527 /* flush any pending output */ 1528 if (f->f_prevcount) 1529 fprintlog(f, 0, (char *)NULL); 1530 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1531 close_filed(f); 1532 f->f_un.f_pipe.f_pid = 0; 1533 } 1534 } 1535 Initialized = was_initialized; 1536 if (signo) { 1537 dprintf("syslogd: exiting on signal %d\n", signo); 1538 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1539 errno = 0; 1540 logerror(buf); 1541 } 1542 STAILQ_FOREACH(fx, &funixes, next) 1543 (void)unlink(fx->name); 1544 pidfile_remove(pfh); 1545 1546 exit(1); 1547} 1548 1549/* 1550 * INIT -- Initialize syslogd from configuration table 1551 */ 1552static void 1553init(int signo) 1554{ 1555 int i; 1556 FILE *cf; 1557 struct filed *f, *next, **nextp; 1558 char *p; 1559 char cline[LINE_MAX]; 1560 char prog[LINE_MAX]; 1561 char host[MAXHOSTNAMELEN]; 1562 char oldLocalHostName[MAXHOSTNAMELEN]; 1563 char hostMsg[2*MAXHOSTNAMELEN+40]; 1564 char bootfileMsg[LINE_MAX]; 1565 1566 dprintf("init\n"); 1567 1568 /* 1569 * Load hostname (may have changed). 1570 */ 1571 if (signo != 0) 1572 (void)strlcpy(oldLocalHostName, LocalHostName, 1573 sizeof(oldLocalHostName)); 1574 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1575 err(EX_OSERR, "gethostname() failed"); 1576 if ((p = strchr(LocalHostName, '.')) != NULL) { 1577 *p++ = '\0'; 1578 LocalDomain = p; 1579 } else { 1580 LocalDomain = ""; 1581 } 1582 1583 /* 1584 * Close all open log files. 1585 */ 1586 Initialized = 0; 1587 for (f = Files; f != NULL; f = next) { 1588 /* flush any pending output */ 1589 if (f->f_prevcount) 1590 fprintlog(f, 0, (char *)NULL); 1591 1592 switch (f->f_type) { 1593 case F_FILE: 1594 case F_FORW: 1595 case F_CONSOLE: 1596 case F_TTY: 1597 close_filed(f); 1598 break; 1599 case F_PIPE: 1600 if (f->f_un.f_pipe.f_pid > 0) { 1601 close_filed(f); 1602 deadq_enter(f->f_un.f_pipe.f_pid, 1603 f->f_un.f_pipe.f_pname); 1604 } 1605 f->f_un.f_pipe.f_pid = 0; 1606 break; 1607 } 1608 next = f->f_next; 1609 if (f->f_program) free(f->f_program); 1610 if (f->f_host) free(f->f_host); 1611 free((char *)f); 1612 } 1613 Files = NULL; 1614 nextp = &Files; 1615 1616 /* open the configuration file */ 1617 if ((cf = fopen(ConfFile, "r")) == NULL) { 1618 dprintf("cannot open %s\n", ConfFile); 1619 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1620 if (*nextp == NULL) { 1621 logerror("calloc"); 1622 exit(1); 1623 } 1624 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1625 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1626 if ((*nextp)->f_next == NULL) { 1627 logerror("calloc"); 1628 exit(1); 1629 } 1630 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1631 Initialized = 1; 1632 return; 1633 } 1634 1635 /* 1636 * Foreach line in the conf table, open that file. 1637 */ 1638 f = NULL; 1639 (void)strlcpy(host, "*", sizeof(host)); 1640 (void)strlcpy(prog, "*", sizeof(prog)); 1641 while (fgets(cline, sizeof(cline), cf) != NULL) { 1642 /* 1643 * check for end-of-section, comments, strip off trailing 1644 * spaces and newline character. #!prog is treated specially: 1645 * following lines apply only to that program. 1646 */ 1647 for (p = cline; isspace(*p); ++p) 1648 continue; 1649 if (*p == 0) 1650 continue; 1651 if (*p == '#') { 1652 p++; 1653 if (*p != '!' && *p != '+' && *p != '-') 1654 continue; 1655 } 1656 if (*p == '+' || *p == '-') { 1657 host[0] = *p++; 1658 while (isspace(*p)) 1659 p++; 1660 if ((!*p) || (*p == '*')) { 1661 (void)strlcpy(host, "*", sizeof(host)); 1662 continue; 1663 } 1664 if (*p == '@') 1665 p = LocalHostName; 1666 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1667 if (!isalnum(*p) && *p != '.' && *p != '-' 1668 && *p != ',' && *p != ':' && *p != '%') 1669 break; 1670 host[i] = *p++; 1671 } 1672 host[i] = '\0'; 1673 continue; 1674 } 1675 if (*p == '!') { 1676 p++; 1677 while (isspace(*p)) p++; 1678 if ((!*p) || (*p == '*')) { 1679 (void)strlcpy(prog, "*", sizeof(prog)); 1680 continue; 1681 } 1682 for (i = 0; i < LINE_MAX - 1; i++) { 1683 if (!isprint(p[i]) || isspace(p[i])) 1684 break; 1685 prog[i] = p[i]; 1686 } 1687 prog[i] = 0; 1688 continue; 1689 } 1690 for (p = cline + 1; *p != '\0'; p++) { 1691 if (*p != '#') 1692 continue; 1693 if (*(p - 1) == '\\') { 1694 strcpy(p - 1, p); 1695 p--; 1696 continue; 1697 } 1698 *p = '\0'; 1699 break; 1700 } 1701 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1702 cline[i] = '\0'; 1703 f = (struct filed *)calloc(1, sizeof(*f)); 1704 if (f == NULL) { 1705 logerror("calloc"); 1706 exit(1); 1707 } 1708 *nextp = f; 1709 nextp = &f->f_next; 1710 cfline(cline, f, prog, host); 1711 } 1712 1713 /* close the configuration file */ 1714 (void)fclose(cf); 1715 1716 Initialized = 1; 1717 1718 if (Debug) { 1719 int port; 1720 for (f = Files; f; f = f->f_next) { 1721 for (i = 0; i <= LOG_NFACILITIES; i++) 1722 if (f->f_pmask[i] == INTERNAL_NOPRI) 1723 printf("X "); 1724 else 1725 printf("%d ", f->f_pmask[i]); 1726 printf("%s: ", TypeNames[f->f_type]); 1727 switch (f->f_type) { 1728 case F_FILE: 1729 printf("%s", f->f_un.f_fname); 1730 break; 1731 1732 case F_CONSOLE: 1733 case F_TTY: 1734 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1735 break; 1736 1737 case F_FORW: 1738 port = (int)ntohs(((struct sockaddr_in *) 1739 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1740 if (port != 514) { 1741 printf("%s:%d", 1742 f->f_un.f_forw.f_hname, port); 1743 } else { 1744 printf("%s", f->f_un.f_forw.f_hname); 1745 } 1746 break; 1747 1748 case F_PIPE: 1749 printf("%s", f->f_un.f_pipe.f_pname); 1750 break; 1751 1752 case F_USERS: 1753 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1754 printf("%s, ", f->f_un.f_uname[i]); 1755 break; 1756 } 1757 if (f->f_program) 1758 printf(" (%s)", f->f_program); 1759 printf("\n"); 1760 } 1761 } 1762 1763 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1764 dprintf("syslogd: restarted\n"); 1765 /* 1766 * Log a change in hostname, but only on a restart. 1767 */ 1768 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1769 (void)snprintf(hostMsg, sizeof(hostMsg), 1770 "syslogd: hostname changed, \"%s\" to \"%s\"", 1771 oldLocalHostName, LocalHostName); 1772 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1773 dprintf("%s\n", hostMsg); 1774 } 1775 /* 1776 * Log the kernel boot file if we aren't going to use it as 1777 * the prefix, and if this is *not* a restart. 1778 */ 1779 if (signo == 0 && !use_bootfile) { 1780 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1781 "syslogd: kernel boot file is %s", bootfile); 1782 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1783 dprintf("%s\n", bootfileMsg); 1784 } 1785} 1786 1787/* 1788 * Crack a configuration file line 1789 */ 1790static void 1791cfline(const char *line, struct filed *f, const char *prog, const char *host) 1792{ 1793 struct addrinfo hints, *res; 1794 int error, i, pri, syncfile; 1795 const char *p, *q; 1796 char *bp; 1797 char buf[MAXLINE], ebuf[100]; 1798 1799 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1800 1801 errno = 0; /* keep strerror() stuff out of logerror messages */ 1802 1803 /* clear out file entry */ 1804 memset(f, 0, sizeof(*f)); 1805 for (i = 0; i <= LOG_NFACILITIES; i++) 1806 f->f_pmask[i] = INTERNAL_NOPRI; 1807 1808 /* save hostname if any */ 1809 if (host && *host == '*') 1810 host = NULL; 1811 if (host) { 1812 int hl; 1813 1814 f->f_host = strdup(host); 1815 if (f->f_host == NULL) { 1816 logerror("strdup"); 1817 exit(1); 1818 } 1819 hl = strlen(f->f_host); 1820 if (hl > 0 && f->f_host[hl-1] == '.') 1821 f->f_host[--hl] = '\0'; 1822 trimdomain(f->f_host, hl); 1823 } 1824 1825 /* save program name if any */ 1826 if (prog && *prog == '*') 1827 prog = NULL; 1828 if (prog) { 1829 f->f_program = strdup(prog); 1830 if (f->f_program == NULL) { 1831 logerror("strdup"); 1832 exit(1); 1833 } 1834 } 1835 1836 /* scan through the list of selectors */ 1837 for (p = line; *p && *p != '\t' && *p != ' ';) { 1838 int pri_done; 1839 int pri_cmp; 1840 int pri_invert; 1841 1842 /* find the end of this facility name list */ 1843 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1844 continue; 1845 1846 /* get the priority comparison */ 1847 pri_cmp = 0; 1848 pri_done = 0; 1849 pri_invert = 0; 1850 if (*q == '!') { 1851 pri_invert = 1; 1852 q++; 1853 } 1854 while (!pri_done) { 1855 switch (*q) { 1856 case '<': 1857 pri_cmp |= PRI_LT; 1858 q++; 1859 break; 1860 case '=': 1861 pri_cmp |= PRI_EQ; 1862 q++; 1863 break; 1864 case '>': 1865 pri_cmp |= PRI_GT; 1866 q++; 1867 break; 1868 default: 1869 pri_done++; 1870 break; 1871 } 1872 } 1873 1874 /* collect priority name */ 1875 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1876 *bp++ = *q++; 1877 *bp = '\0'; 1878 1879 /* skip cruft */ 1880 while (strchr(",;", *q)) 1881 q++; 1882 1883 /* decode priority name */ 1884 if (*buf == '*') { 1885 pri = LOG_PRIMASK; 1886 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1887 } else { 1888 /* Ignore trailing spaces. */ 1889 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1890 buf[i] = '\0'; 1891 1892 pri = decode(buf, prioritynames); 1893 if (pri < 0) { 1894 errno = 0; 1895 (void)snprintf(ebuf, sizeof ebuf, 1896 "unknown priority name \"%s\"", buf); 1897 logerror(ebuf); 1898 return; 1899 } 1900 } 1901 if (!pri_cmp) 1902 pri_cmp = (UniquePriority) 1903 ? (PRI_EQ) 1904 : (PRI_EQ | PRI_GT) 1905 ; 1906 if (pri_invert) 1907 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1908 1909 /* scan facilities */ 1910 while (*p && !strchr("\t.; ", *p)) { 1911 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1912 *bp++ = *p++; 1913 *bp = '\0'; 1914 1915 if (*buf == '*') { 1916 for (i = 0; i < LOG_NFACILITIES; i++) { 1917 f->f_pmask[i] = pri; 1918 f->f_pcmp[i] = pri_cmp; 1919 } 1920 } else { 1921 i = decode(buf, facilitynames); 1922 if (i < 0) { 1923 errno = 0; 1924 (void)snprintf(ebuf, sizeof ebuf, 1925 "unknown facility name \"%s\"", 1926 buf); 1927 logerror(ebuf); 1928 return; 1929 } 1930 f->f_pmask[i >> 3] = pri; 1931 f->f_pcmp[i >> 3] = pri_cmp; 1932 } 1933 while (*p == ',' || *p == ' ') 1934 p++; 1935 } 1936 1937 p = q; 1938 } 1939 1940 /* skip to action part */ 1941 while (*p == '\t' || *p == ' ') 1942 p++; 1943 1944 if (*p == '-') { 1945 syncfile = 0; 1946 p++; 1947 } else 1948 syncfile = 1; 1949 1950 switch (*p) { 1951 case '@': 1952 { 1953 char *tp; 1954 char endkey = ':'; 1955 /* 1956 * scan forward to see if there is a port defined. 1957 * so we can't use strlcpy.. 1958 */ 1959 i = sizeof(f->f_un.f_forw.f_hname); 1960 tp = f->f_un.f_forw.f_hname; 1961 p++; 1962 1963 /* 1964 * an ipv6 address should start with a '[' in that case 1965 * we should scan for a ']' 1966 */ 1967 if (*p == '[') { 1968 p++; 1969 endkey = ']'; 1970 } 1971 while (*p && (*p != endkey) && (i-- > 0)) { 1972 *tp++ = *p++; 1973 } 1974 if (endkey == ']' && *p == endkey) 1975 p++; 1976 *tp = '\0'; 1977 } 1978 /* See if we copied a domain and have a port */ 1979 if (*p == ':') 1980 p++; 1981 else 1982 p = NULL; 1983 1984 memset(&hints, 0, sizeof(hints)); 1985 hints.ai_family = family; 1986 hints.ai_socktype = SOCK_DGRAM; 1987 error = getaddrinfo(f->f_un.f_forw.f_hname, 1988 p ? p : "syslog", &hints, &res); 1989 if (error) { 1990 logerror(gai_strerror(error)); 1991 break; 1992 } 1993 f->f_un.f_forw.f_addr = res; 1994 f->f_type = F_FORW; 1995 break; 1996 1997 case '/': 1998 if ((f->f_file = open(p, logflags, 0600)) < 0) { 1999 f->f_type = F_UNUSED; 2000 logerror(p); 2001 break; 2002 } 2003 if (syncfile) 2004 f->f_flags |= FFLAG_SYNC; 2005 if (isatty(f->f_file)) { 2006 if (strcmp(p, ctty) == 0) 2007 f->f_type = F_CONSOLE; 2008 else 2009 f->f_type = F_TTY; 2010 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2011 sizeof(f->f_un.f_fname)); 2012 } else { 2013 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2014 f->f_type = F_FILE; 2015 } 2016 break; 2017 2018 case '|': 2019 f->f_un.f_pipe.f_pid = 0; 2020 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2021 sizeof(f->f_un.f_pipe.f_pname)); 2022 f->f_type = F_PIPE; 2023 break; 2024 2025 case '*': 2026 f->f_type = F_WALL; 2027 break; 2028 2029 default: 2030 for (i = 0; i < MAXUNAMES && *p; i++) { 2031 for (q = p; *q && *q != ','; ) 2032 q++; 2033 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2034 if ((q - p) >= MAXLOGNAME) 2035 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2036 else 2037 f->f_un.f_uname[i][q - p] = '\0'; 2038 while (*q == ',' || *q == ' ') 2039 q++; 2040 p = q; 2041 } 2042 f->f_type = F_USERS; 2043 break; 2044 } 2045} 2046 2047 2048/* 2049 * Decode a symbolic name to a numeric value 2050 */ 2051static int 2052decode(const char *name, const CODE *codetab) 2053{ 2054 const CODE *c; 2055 char *p, buf[40]; 2056 2057 if (isdigit(*name)) 2058 return (atoi(name)); 2059 2060 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2061 if (isupper(*name)) 2062 *p = tolower(*name); 2063 else 2064 *p = *name; 2065 } 2066 *p = '\0'; 2067 for (c = codetab; c->c_name; c++) 2068 if (!strcmp(buf, c->c_name)) 2069 return (c->c_val); 2070 2071 return (-1); 2072} 2073 2074static void 2075markit(void) 2076{ 2077 struct filed *f; 2078 dq_t q, next; 2079 2080 now = time((time_t *)NULL); 2081 MarkSeq += TIMERINTVL; 2082 if (MarkSeq >= MarkInterval) { 2083 logmsg(LOG_INFO, "-- MARK --", 2084 LocalHostName, ADDDATE|MARK); 2085 MarkSeq = 0; 2086 } 2087 2088 for (f = Files; f; f = f->f_next) { 2089 if (f->f_prevcount && now >= REPEATTIME(f)) { 2090 dprintf("flush %s: repeated %d times, %d sec.\n", 2091 TypeNames[f->f_type], f->f_prevcount, 2092 repeatinterval[f->f_repeatcount]); 2093 fprintlog(f, 0, (char *)NULL); 2094 BACKOFF(f); 2095 } 2096 } 2097 2098 /* Walk the dead queue, and see if we should signal somebody. */ 2099 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2100 next = TAILQ_NEXT(q, dq_entries); 2101 2102 switch (q->dq_timeout) { 2103 case 0: 2104 /* Already signalled once, try harder now. */ 2105 if (kill(q->dq_pid, SIGKILL) != 0) 2106 (void)deadq_remove(q->dq_pid); 2107 break; 2108 2109 case 1: 2110 /* 2111 * Timed out on dead queue, send terminate 2112 * signal. Note that we leave the removal 2113 * from the dead queue to reapchild(), which 2114 * will also log the event (unless the process 2115 * didn't even really exist, in case we simply 2116 * drop it from the dead queue). 2117 */ 2118 if (kill(q->dq_pid, SIGTERM) != 0) 2119 (void)deadq_remove(q->dq_pid); 2120 /* FALLTHROUGH */ 2121 2122 default: 2123 q->dq_timeout--; 2124 } 2125 } 2126 MarkSet = 0; 2127 (void)alarm(TIMERINTVL); 2128} 2129 2130/* 2131 * fork off and become a daemon, but wait for the child to come online 2132 * before returing to the parent, or we get disk thrashing at boot etc. 2133 * Set a timer so we don't hang forever if it wedges. 2134 */ 2135static int 2136waitdaemon(int nochdir, int noclose, int maxwait) 2137{ 2138 int fd; 2139 int status; 2140 pid_t pid, childpid; 2141 2142 switch (childpid = fork()) { 2143 case -1: 2144 return (-1); 2145 case 0: 2146 break; 2147 default: 2148 signal(SIGALRM, timedout); 2149 alarm(maxwait); 2150 while ((pid = wait3(&status, 0, NULL)) != -1) { 2151 if (WIFEXITED(status)) 2152 errx(1, "child pid %d exited with return code %d", 2153 pid, WEXITSTATUS(status)); 2154 if (WIFSIGNALED(status)) 2155 errx(1, "child pid %d exited on signal %d%s", 2156 pid, WTERMSIG(status), 2157 WCOREDUMP(status) ? " (core dumped)" : 2158 ""); 2159 if (pid == childpid) /* it's gone... */ 2160 break; 2161 } 2162 exit(0); 2163 } 2164 2165 if (setsid() == -1) 2166 return (-1); 2167 2168 if (!nochdir) 2169 (void)chdir("/"); 2170 2171 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2172 (void)dup2(fd, STDIN_FILENO); 2173 (void)dup2(fd, STDOUT_FILENO); 2174 (void)dup2(fd, STDERR_FILENO); 2175 if (fd > 2) 2176 (void)close (fd); 2177 } 2178 return (getppid()); 2179} 2180 2181/* 2182 * We get a SIGALRM from the child when it's running and finished doing it's 2183 * fsync()'s or O_SYNC writes for all the boot messages. 2184 * 2185 * We also get a signal from the kernel if the timer expires, so check to 2186 * see what happened. 2187 */ 2188static void 2189timedout(int sig __unused) 2190{ 2191 int left; 2192 left = alarm(0); 2193 signal(SIGALRM, SIG_DFL); 2194 if (left == 0) 2195 errx(1, "timed out waiting for child"); 2196 else 2197 _exit(0); 2198} 2199 2200/* 2201 * Add `s' to the list of allowable peer addresses to accept messages 2202 * from. 2203 * 2204 * `s' is a string in the form: 2205 * 2206 * [*]domainname[:{servicename|portnumber|*}] 2207 * 2208 * or 2209 * 2210 * netaddr/maskbits[:{servicename|portnumber|*}] 2211 * 2212 * Returns -1 on error, 0 if the argument was valid. 2213 */ 2214static int 2215allowaddr(char *s) 2216{ 2217 char *cp1, *cp2; 2218 struct allowedpeer ap; 2219 struct servent *se; 2220 int masklen = -1; 2221 struct addrinfo hints, *res; 2222 struct in_addr *addrp, *maskp; 2223#ifdef INET6 2224 int i; 2225 u_int32_t *addr6p, *mask6p; 2226#endif 2227 char ip[NI_MAXHOST]; 2228 2229#ifdef INET6 2230 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2231#endif 2232 cp1 = s; 2233 if ((cp1 = strrchr(cp1, ':'))) { 2234 /* service/port provided */ 2235 *cp1++ = '\0'; 2236 if (strlen(cp1) == 1 && *cp1 == '*') 2237 /* any port allowed */ 2238 ap.port = 0; 2239 else if ((se = getservbyname(cp1, "udp"))) { 2240 ap.port = ntohs(se->s_port); 2241 } else { 2242 ap.port = strtol(cp1, &cp2, 0); 2243 if (*cp2 != '\0') 2244 return (-1); /* port not numeric */ 2245 } 2246 } else { 2247 if ((se = getservbyname("syslog", "udp"))) 2248 ap.port = ntohs(se->s_port); 2249 else 2250 /* sanity, should not happen */ 2251 ap.port = 514; 2252 } 2253 2254 if ((cp1 = strchr(s, '/')) != NULL && 2255 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2256 *cp1 = '\0'; 2257 if ((masklen = atoi(cp1 + 1)) < 0) 2258 return (-1); 2259 } 2260#ifdef INET6 2261 if (*s == '[') { 2262 cp2 = s + strlen(s) - 1; 2263 if (*cp2 == ']') { 2264 ++s; 2265 *cp2 = '\0'; 2266 } else { 2267 cp2 = NULL; 2268 } 2269 } else { 2270 cp2 = NULL; 2271 } 2272#endif 2273 memset(&hints, 0, sizeof(hints)); 2274 hints.ai_family = PF_UNSPEC; 2275 hints.ai_socktype = SOCK_DGRAM; 2276 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2277 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2278 ap.isnumeric = 1; 2279 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2280 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2281 ap.a_mask.ss_family = res->ai_family; 2282 if (res->ai_family == AF_INET) { 2283 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2284 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2285 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2286 if (masklen < 0) { 2287 /* use default netmask */ 2288 if (IN_CLASSA(ntohl(addrp->s_addr))) 2289 maskp->s_addr = htonl(IN_CLASSA_NET); 2290 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2291 maskp->s_addr = htonl(IN_CLASSB_NET); 2292 else 2293 maskp->s_addr = htonl(IN_CLASSC_NET); 2294 } else if (masklen <= 32) { 2295 /* convert masklen to netmask */ 2296 if (masklen == 0) 2297 maskp->s_addr = 0; 2298 else 2299 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2300 } else { 2301 freeaddrinfo(res); 2302 return (-1); 2303 } 2304 /* Lose any host bits in the network number. */ 2305 addrp->s_addr &= maskp->s_addr; 2306 } 2307#ifdef INET6 2308 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2309 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2310 if (masklen < 0) 2311 masklen = 128; 2312 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2313 /* convert masklen to netmask */ 2314 while (masklen > 0) { 2315 if (masklen < 32) { 2316 *mask6p = htonl(~(0xffffffff >> masklen)); 2317 break; 2318 } 2319 *mask6p++ = 0xffffffff; 2320 masklen -= 32; 2321 } 2322 /* Lose any host bits in the network number. */ 2323 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2324 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2325 for (i = 0; i < 4; i++) 2326 addr6p[i] &= mask6p[i]; 2327 } 2328#endif 2329 else { 2330 freeaddrinfo(res); 2331 return (-1); 2332 } 2333 freeaddrinfo(res); 2334 } else { 2335 /* arg `s' is domain name */ 2336 ap.isnumeric = 0; 2337 ap.a_name = s; 2338 if (cp1) 2339 *cp1 = '/'; 2340#ifdef INET6 2341 if (cp2) { 2342 *cp2 = ']'; 2343 --s; 2344 } 2345#endif 2346 } 2347 2348 if (Debug) { 2349 printf("allowaddr: rule %d: ", NumAllowed); 2350 if (ap.isnumeric) { 2351 printf("numeric, "); 2352 getnameinfo((struct sockaddr *)&ap.a_addr, 2353 ((struct sockaddr *)&ap.a_addr)->sa_len, 2354 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2355 printf("addr = %s, ", ip); 2356 getnameinfo((struct sockaddr *)&ap.a_mask, 2357 ((struct sockaddr *)&ap.a_mask)->sa_len, 2358 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2359 printf("mask = %s; ", ip); 2360 } else { 2361 printf("domainname = %s; ", ap.a_name); 2362 } 2363 printf("port = %d\n", ap.port); 2364 } 2365 2366 if ((AllowedPeers = realloc(AllowedPeers, 2367 ++NumAllowed * sizeof(struct allowedpeer))) 2368 == NULL) { 2369 logerror("realloc"); 2370 exit(1); 2371 } 2372 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2373 return (0); 2374} 2375 2376/* 2377 * Validate that the remote peer has permission to log to us. 2378 */ 2379static int 2380validate(struct sockaddr *sa, const char *hname) 2381{ 2382 int i; 2383 size_t l1, l2; 2384 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2385 struct allowedpeer *ap; 2386 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2387#ifdef INET6 2388 int j, reject; 2389 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2390#endif 2391 struct addrinfo hints, *res; 2392 u_short sport; 2393 2394 if (NumAllowed == 0) 2395 /* traditional behaviour, allow everything */ 2396 return (1); 2397 2398 (void)strlcpy(name, hname, sizeof(name)); 2399 memset(&hints, 0, sizeof(hints)); 2400 hints.ai_family = PF_UNSPEC; 2401 hints.ai_socktype = SOCK_DGRAM; 2402 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2403 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2404 freeaddrinfo(res); 2405 else if (strchr(name, '.') == NULL) { 2406 strlcat(name, ".", sizeof name); 2407 strlcat(name, LocalDomain, sizeof name); 2408 } 2409 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2410 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2411 return (0); /* for safety, should not occur */ 2412 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2413 ip, port, name); 2414 sport = atoi(port); 2415 2416 /* now, walk down the list */ 2417 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2418 if (ap->port != 0 && ap->port != sport) { 2419 dprintf("rejected in rule %d due to port mismatch.\n", i); 2420 continue; 2421 } 2422 2423 if (ap->isnumeric) { 2424 if (ap->a_addr.ss_family != sa->sa_family) { 2425 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2426 continue; 2427 } 2428 if (ap->a_addr.ss_family == AF_INET) { 2429 sin4 = (struct sockaddr_in *)sa; 2430 a4p = (struct sockaddr_in *)&ap->a_addr; 2431 m4p = (struct sockaddr_in *)&ap->a_mask; 2432 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2433 != a4p->sin_addr.s_addr) { 2434 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2435 continue; 2436 } 2437 } 2438#ifdef INET6 2439 else if (ap->a_addr.ss_family == AF_INET6) { 2440 sin6 = (struct sockaddr_in6 *)sa; 2441 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2442 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2443 if (a6p->sin6_scope_id != 0 && 2444 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2445 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2446 continue; 2447 } 2448 reject = 0; 2449 for (j = 0; j < 16; j += 4) { 2450 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2451 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2452 ++reject; 2453 break; 2454 } 2455 } 2456 if (reject) { 2457 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2458 continue; 2459 } 2460 } 2461#endif 2462 else 2463 continue; 2464 } else { 2465 cp = ap->a_name; 2466 l1 = strlen(name); 2467 if (*cp == '*') { 2468 /* allow wildmatch */ 2469 cp++; 2470 l2 = strlen(cp); 2471 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2472 dprintf("rejected in rule %d due to name mismatch.\n", i); 2473 continue; 2474 } 2475 } else { 2476 /* exact match */ 2477 l2 = strlen(cp); 2478 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2479 dprintf("rejected in rule %d due to name mismatch.\n", i); 2480 continue; 2481 } 2482 } 2483 } 2484 dprintf("accepted in rule %d.\n", i); 2485 return (1); /* hooray! */ 2486 } 2487 return (0); 2488} 2489 2490/* 2491 * Fairly similar to popen(3), but returns an open descriptor, as 2492 * opposed to a FILE *. 2493 */ 2494static int 2495p_open(const char *prog, pid_t *rpid) 2496{ 2497 int pfd[2], nulldesc; 2498 pid_t pid; 2499 sigset_t omask, mask; 2500 char *argv[4]; /* sh -c cmd NULL */ 2501 char errmsg[200]; 2502 2503 if (pipe(pfd) == -1) 2504 return (-1); 2505 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2506 /* we are royally screwed anyway */ 2507 return (-1); 2508 2509 sigemptyset(&mask); 2510 sigaddset(&mask, SIGALRM); 2511 sigaddset(&mask, SIGHUP); 2512 sigprocmask(SIG_BLOCK, &mask, &omask); 2513 switch ((pid = fork())) { 2514 case -1: 2515 sigprocmask(SIG_SETMASK, &omask, 0); 2516 close(nulldesc); 2517 return (-1); 2518 2519 case 0: 2520 argv[0] = strdup("sh"); 2521 argv[1] = strdup("-c"); 2522 argv[2] = strdup(prog); 2523 argv[3] = NULL; 2524 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2525 logerror("strdup"); 2526 exit(1); 2527 } 2528 2529 alarm(0); 2530 (void)setsid(); /* Avoid catching SIGHUPs. */ 2531 2532 /* 2533 * Throw away pending signals, and reset signal 2534 * behaviour to standard values. 2535 */ 2536 signal(SIGALRM, SIG_IGN); 2537 signal(SIGHUP, SIG_IGN); 2538 sigprocmask(SIG_SETMASK, &omask, 0); 2539 signal(SIGPIPE, SIG_DFL); 2540 signal(SIGQUIT, SIG_DFL); 2541 signal(SIGALRM, SIG_DFL); 2542 signal(SIGHUP, SIG_DFL); 2543 2544 dup2(pfd[0], STDIN_FILENO); 2545 dup2(nulldesc, STDOUT_FILENO); 2546 dup2(nulldesc, STDERR_FILENO); 2547 closefrom(3); 2548 2549 (void)execvp(_PATH_BSHELL, argv); 2550 _exit(255); 2551 } 2552 2553 sigprocmask(SIG_SETMASK, &omask, 0); 2554 close(nulldesc); 2555 close(pfd[0]); 2556 /* 2557 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2558 * supposed to get an EWOULDBLOCK on writev(2), which is 2559 * caught by the logic above anyway, which will in turn close 2560 * the pipe, and fork a new logging subprocess if necessary. 2561 * The stale subprocess will be killed some time later unless 2562 * it terminated itself due to closing its input pipe (so we 2563 * get rid of really dead puppies). 2564 */ 2565 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2566 /* This is bad. */ 2567 (void)snprintf(errmsg, sizeof errmsg, 2568 "Warning: cannot change pipe to PID %d to " 2569 "non-blocking behaviour.", 2570 (int)pid); 2571 logerror(errmsg); 2572 } 2573 *rpid = pid; 2574 return (pfd[1]); 2575} 2576 2577static void 2578deadq_enter(pid_t pid, const char *name) 2579{ 2580 dq_t p; 2581 int status; 2582 2583 /* 2584 * Be paranoid, if we can't signal the process, don't enter it 2585 * into the dead queue (perhaps it's already dead). If possible, 2586 * we try to fetch and log the child's status. 2587 */ 2588 if (kill(pid, 0) != 0) { 2589 if (waitpid(pid, &status, WNOHANG) > 0) 2590 log_deadchild(pid, status, name); 2591 return; 2592 } 2593 2594 p = malloc(sizeof(struct deadq_entry)); 2595 if (p == NULL) { 2596 logerror("malloc"); 2597 exit(1); 2598 } 2599 2600 p->dq_pid = pid; 2601 p->dq_timeout = DQ_TIMO_INIT; 2602 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2603} 2604 2605static int 2606deadq_remove(pid_t pid) 2607{ 2608 dq_t q; 2609 2610 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2611 if (q->dq_pid == pid) { 2612 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2613 free(q); 2614 return (1); 2615 } 2616 } 2617 2618 return (0); 2619} 2620 2621static void 2622log_deadchild(pid_t pid, int status, const char *name) 2623{ 2624 int code; 2625 char buf[256]; 2626 const char *reason; 2627 2628 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2629 if (WIFSIGNALED(status)) { 2630 reason = "due to signal"; 2631 code = WTERMSIG(status); 2632 } else { 2633 reason = "with status"; 2634 code = WEXITSTATUS(status); 2635 if (code == 0) 2636 return; 2637 } 2638 (void)snprintf(buf, sizeof buf, 2639 "Logging subprocess %d (%s) exited %s %d.", 2640 pid, name, reason, code); 2641 logerror(buf); 2642} 2643 2644static int * 2645socksetup(int af, char *bindhostname) 2646{ 2647 struct addrinfo hints, *res, *r; 2648 const char *bindservice; 2649 char *cp; 2650 int error, maxs, *s, *socks; 2651 2652 /* 2653 * We have to handle this case for backwards compatibility: 2654 * If there are two (or more) colons but no '[' and ']', 2655 * assume this is an inet6 address without a service. 2656 */ 2657 bindservice = "syslog"; 2658 if (bindhostname != NULL) { 2659#ifdef INET6 2660 if (*bindhostname == '[' && 2661 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2662 ++bindhostname; 2663 *cp = '\0'; 2664 if (cp[1] == ':' && cp[2] != '\0') 2665 bindservice = cp + 2; 2666 } else { 2667#endif 2668 cp = strchr(bindhostname, ':'); 2669 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2670 *cp = '\0'; 2671 if (cp[1] != '\0') 2672 bindservice = cp + 1; 2673 if (cp == bindhostname) 2674 bindhostname = NULL; 2675 } 2676#ifdef INET6 2677 } 2678#endif 2679 } 2680 2681 memset(&hints, 0, sizeof(hints)); 2682 hints.ai_flags = AI_PASSIVE; 2683 hints.ai_family = af; 2684 hints.ai_socktype = SOCK_DGRAM; 2685 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2686 if (error) { 2687 logerror(gai_strerror(error)); 2688 errno = 0; 2689 die(0); 2690 } 2691 2692 /* Count max number of sockets we may open */ 2693 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2694 socks = malloc((maxs+1) * sizeof(int)); 2695 if (socks == NULL) { 2696 logerror("couldn't allocate memory for sockets"); 2697 die(0); 2698 } 2699 2700 *socks = 0; /* num of sockets counter at start of array */ 2701 s = socks + 1; 2702 for (r = res; r; r = r->ai_next) { 2703 int on = 1; 2704 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2705 if (*s < 0) { 2706 logerror("socket"); 2707 continue; 2708 } 2709#ifdef INET6 2710 if (r->ai_family == AF_INET6) { 2711 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2712 (char *)&on, sizeof (on)) < 0) { 2713 logerror("setsockopt"); 2714 close(*s); 2715 continue; 2716 } 2717 } 2718#endif 2719 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2720 (char *)&on, sizeof (on)) < 0) { 2721 logerror("setsockopt"); 2722 close(*s); 2723 continue; 2724 } 2725 /* 2726 * RFC 3164 recommends that client side message 2727 * should come from the privileged syslogd port. 2728 * 2729 * If the system administrator choose not to obey 2730 * this, we can skip the bind() step so that the 2731 * system will choose a port for us. 2732 */ 2733 if (!NoBind) { 2734 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2735 logerror("bind"); 2736 close(*s); 2737 continue; 2738 } 2739 2740 if (!SecureMode) 2741 increase_rcvbuf(*s); 2742 } 2743 2744 (*socks)++; 2745 s++; 2746 } 2747 2748 if (*socks == 0) { 2749 free(socks); 2750 if (Debug) 2751 return (NULL); 2752 else 2753 die(0); 2754 } 2755 if (res) 2756 freeaddrinfo(res); 2757 2758 return (socks); 2759} 2760 2761static void 2762increase_rcvbuf(int fd) 2763{ 2764 socklen_t len, slen; 2765 2766 slen = sizeof(len); 2767 2768 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2769 if (len < RCVBUF_MINSIZE) { 2770 len = RCVBUF_MINSIZE; 2771 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2772 } 2773 } 2774} 2775