syslogd.c revision 320229
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 320229 2017-06-22 07:54:12Z 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/* Maximum number of characters in time of last occurrence */ 72#define MAXDATELEN 16 73#define MAXLINE 1024 /* maximum line length */ 74#define MAXSVLINE MAXLINE /* maximum saved line length */ 75#define DEFUPRI (LOG_USER|LOG_NOTICE) 76#define DEFSPRI (LOG_KERN|LOG_CRIT) 77#define TIMERINTVL 30 /* interval for checking flush, mark */ 78#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 79#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 80 81#include <sys/param.h> 82#include <sys/ioctl.h> 83#include <sys/mman.h> 84#include <sys/queue.h> 85#include <sys/resource.h> 86#include <sys/socket.h> 87#include <sys/stat.h> 88#include <sys/syslimits.h> 89#include <sys/time.h> 90#include <sys/uio.h> 91#include <sys/un.h> 92#include <sys/wait.h> 93#include <sys/types.h> 94 95#include <netinet/in.h> 96#include <netdb.h> 97#include <arpa/inet.h> 98 99#include <ctype.h> 100#include <err.h> 101#include <errno.h> 102#include <fcntl.h> 103#include <libutil.h> 104#include <limits.h> 105#include <paths.h> 106#include <signal.h> 107#include <stdio.h> 108#include <stdlib.h> 109#include <string.h> 110#include <sysexits.h> 111#include <unistd.h> 112#include <utmpx.h> 113 114#include "pathnames.h" 115#include "ttymsg.h" 116 117#define SYSLOG_NAMES 118#include <sys/syslog.h> 119 120const char *ConfFile = _PATH_LOGCONF; 121const char *PidFile = _PATH_LOGPID; 122const char ctty[] = _PATH_CONSOLE; 123 124#define dprintf if (Debug) printf 125 126#define MAXUNAMES 20 /* maximum number of user names */ 127 128/* 129 * Unix sockets. 130 * We have two default sockets, one with 666 permissions, 131 * and one for privileged programs. 132 */ 133struct funix { 134 int s; 135 const char *name; 136 mode_t mode; 137 STAILQ_ENTRY(funix) next; 138}; 139struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 140 { NULL } }; 141struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 142 { &funix_secure } }; 143 144STAILQ_HEAD(, funix) funixes = { &funix_default, 145 &(funix_secure.next.stqe_next) }; 146 147/* 148 * Flags to logmsg(). 149 */ 150 151#define IGN_CONS 0x001 /* don't print on console */ 152#define SYNC_FILE 0x002 /* do fsync on file after printing */ 153#define ADDDATE 0x004 /* add a date to the message */ 154#define MARK 0x008 /* this message is a mark */ 155#define ISKERNEL 0x010 /* kernel generated message */ 156 157/* 158 * This structure represents the files that will have log 159 * copies printed. 160 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 161 * or if f_type if F_PIPE and f_pid > 0. 162 */ 163 164struct filed { 165 struct filed *f_next; /* next in linked list */ 166 short f_type; /* entry type, see below */ 167 short f_file; /* file descriptor */ 168 time_t f_time; /* time this was last written */ 169 char *f_host; /* host from which to recd. */ 170 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 171 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 172#define PRI_LT 0x1 173#define PRI_EQ 0x2 174#define PRI_GT 0x4 175 char *f_program; /* program this applies to */ 176 union { 177 char f_uname[MAXUNAMES][MAXLOGNAME]; 178 struct { 179 char f_hname[MAXHOSTNAMELEN]; 180 struct addrinfo *f_addr; 181 182 } f_forw; /* forwarding address */ 183 char f_fname[MAXPATHLEN]; 184 struct { 185 char f_pname[MAXPATHLEN]; 186 pid_t f_pid; 187 } f_pipe; 188 } f_un; 189 char f_prevline[MAXSVLINE]; /* last message logged */ 190 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 191 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 192 int f_prevpri; /* pri of f_prevline */ 193 int f_prevlen; /* length of f_prevline */ 194 int f_prevcount; /* repetition cnt of prevline */ 195 u_int f_repeatcount; /* number of "repeated" msgs */ 196 int f_flags; /* file-specific flags */ 197#define FFLAG_SYNC 0x01 198#define FFLAG_NEEDSYNC 0x02 199}; 200 201/* 202 * Queue of about-to-be dead processes we should watch out for. 203 */ 204 205TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 206struct stailhead *deadq_headp; 207 208struct deadq_entry { 209 pid_t dq_pid; 210 int dq_timeout; 211 TAILQ_ENTRY(deadq_entry) dq_entries; 212}; 213 214/* 215 * The timeout to apply to processes waiting on the dead queue. Unit 216 * of measure is `mark intervals', i.e. 20 minutes by default. 217 * Processes on the dead queue will be terminated after that time. 218 */ 219 220#define DQ_TIMO_INIT 2 221 222typedef struct deadq_entry *dq_t; 223 224 225/* 226 * Struct to hold records of network addresses that are allowed to log 227 * to us. 228 */ 229struct allowedpeer { 230 int isnumeric; 231 u_short port; 232 union { 233 struct { 234 struct sockaddr_storage addr; 235 struct sockaddr_storage mask; 236 } numeric; 237 char *name; 238 } u; 239#define a_addr u.numeric.addr 240#define a_mask u.numeric.mask 241#define a_name u.name 242}; 243 244 245/* 246 * Intervals at which we flush out "message repeated" messages, 247 * in seconds after previous message is logged. After each flush, 248 * we move to the next interval until we reach the largest. 249 */ 250int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 251#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 252#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 253#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 254 (f)->f_repeatcount = MAXREPEAT; \ 255 } 256 257/* values for f_type */ 258#define F_UNUSED 0 /* unused entry */ 259#define F_FILE 1 /* regular file */ 260#define F_TTY 2 /* terminal */ 261#define F_CONSOLE 3 /* console terminal */ 262#define F_FORW 4 /* remote machine */ 263#define F_USERS 5 /* list of users */ 264#define F_WALL 6 /* everyone logged on */ 265#define F_PIPE 7 /* pipe to program */ 266 267const char *TypeNames[8] = { 268 "UNUSED", "FILE", "TTY", "CONSOLE", 269 "FORW", "USERS", "WALL", "PIPE" 270}; 271 272static struct filed *Files; /* Log files that we write to */ 273static struct filed consfile; /* Console */ 274 275static int Debug; /* debug flag */ 276static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 277static int resolve = 1; /* resolve hostname */ 278static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 279static const char *LocalDomain; /* our local domain name */ 280static int *finet; /* Internet datagram socket */ 281static int fklog = -1; /* /dev/klog */ 282static int Initialized; /* set when we have initialized ourselves */ 283static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 284static int MarkSeq; /* mark sequence number */ 285static int NoBind; /* don't bind() as suggested by RFC 3164 */ 286static int SecureMode; /* when true, receive only unix domain socks */ 287#ifdef INET6 288static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 289#else 290static int family = PF_INET; /* protocol family (IPv4 only) */ 291#endif 292static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 293static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 294static int use_bootfile; /* log entire bootfile for every kern msg */ 295static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 296static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 297 298static char bootfile[MAXLINE+1]; /* booted kernel file */ 299 300struct allowedpeer *AllowedPeers; /* List of allowed peers */ 301static int NumAllowed; /* Number of entries in AllowedPeers */ 302static int RemoteAddDate; /* Always set the date on remote messages */ 303 304static int UniquePriority; /* Only log specified priority? */ 305static int LogFacPri; /* Put facility and priority in log message: */ 306 /* 0=no, 1=numeric, 2=names */ 307static int KeepKernFac; /* Keep remotely logged kernel facility */ 308static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 309static struct pidfh *pfh; 310 311volatile sig_atomic_t MarkSet, WantDie; 312 313static int allowaddr(char *); 314static void cfline(const char *, struct filed *, 315 const char *, const char *); 316static const char *cvthname(struct sockaddr *); 317static void deadq_enter(pid_t, const char *); 318static int deadq_remove(pid_t); 319static int decode(const char *, const CODE *); 320static void die(int); 321static void dodie(int); 322static void dofsync(void); 323static void domark(int); 324static void fprintlog(struct filed *, int, const char *); 325static int *socksetup(int, char *); 326static void init(int); 327static void logerror(const char *); 328static void logmsg(int, const char *, const char *, int); 329static void log_deadchild(pid_t, int, const char *); 330static void markit(void); 331static int skip_message(const char *, const char *, int); 332static void printline(const char *, char *, int); 333static void printsys(char *); 334static int p_open(const char *, pid_t *); 335static void readklog(void); 336static void reapchild(int); 337static void usage(void); 338static int validate(struct sockaddr *, const char *); 339static void unmapped(struct sockaddr *); 340static void wallmsg(struct filed *, struct iovec *, const int iovlen); 341static int waitdaemon(int, int, int); 342static void timedout(int); 343static void increase_rcvbuf(int); 344 345static void 346close_filed(struct filed *f) 347{ 348 349 if (f == NULL || f->f_file == -1) 350 return; 351 352 (void)close(f->f_file); 353 f->f_file = -1; 354 f->f_type = F_UNUSED; 355} 356 357int 358main(int argc, char *argv[]) 359{ 360 int ch, i, fdsrmax = 0, l; 361 struct sockaddr_un sunx, fromunix; 362 struct sockaddr_storage frominet; 363 fd_set *fdsr = NULL; 364 char line[MAXLINE + 1]; 365 char *bindhostname; 366 const char *hname; 367 struct timeval tv, *tvp; 368 struct sigaction sact; 369 struct funix *fx, *fx1; 370 sigset_t mask; 371 pid_t ppid = 1, spid; 372 socklen_t len; 373 374 if (madvise(NULL, 0, MADV_PROTECT) != 0) 375 dprintf("madvise() failed: %s\n", strerror(errno)); 376 377 bindhostname = NULL; 378 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 379 != -1) 380 switch (ch) { 381 case '4': 382 family = PF_INET; 383 break; 384#ifdef INET6 385 case '6': 386 family = PF_INET6; 387 break; 388#endif 389 case '8': 390 mask_C1 = 0; 391 break; 392 case 'A': 393 send_to_all++; 394 break; 395 case 'a': /* allow specific network addresses only */ 396 if (allowaddr(optarg) == -1) 397 usage(); 398 break; 399 case 'b': 400 bindhostname = optarg; 401 break; 402 case 'c': 403 no_compress++; 404 break; 405 case 'C': 406 logflags |= O_CREAT; 407 break; 408 case 'd': /* debug */ 409 Debug++; 410 break; 411 case 'f': /* configuration file */ 412 ConfFile = optarg; 413 break; 414 case 'F': /* run in foreground instead of daemon */ 415 Foreground++; 416 break; 417 case 'k': /* keep remote kern fac */ 418 KeepKernFac = 1; 419 break; 420 case 'l': 421 { 422 long perml; 423 mode_t mode; 424 char *name, *ep; 425 426 if (optarg[0] == '/') { 427 mode = DEFFILEMODE; 428 name = optarg; 429 } else if ((name = strchr(optarg, ':')) != NULL) { 430 *name++ = '\0'; 431 if (name[0] != '/') 432 errx(1, "socket name must be absolute " 433 "path"); 434 if (isdigit(*optarg)) { 435 perml = strtol(optarg, &ep, 8); 436 if (*ep || perml < 0 || 437 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 438 errx(1, "invalid mode %s, exiting", 439 optarg); 440 mode = (mode_t )perml; 441 } else 442 errx(1, "invalid mode %s, exiting", 443 optarg); 444 } else /* doesn't begin with '/', and no ':' */ 445 errx(1, "can't parse path %s", optarg); 446 447 if (strlen(name) >= sizeof(sunx.sun_path)) 448 errx(1, "%s path too long, exiting", name); 449 if ((fx = malloc(sizeof(struct funix))) == NULL) 450 errx(1, "malloc failed"); 451 fx->s = -1; 452 fx->name = name; 453 fx->mode = mode; 454 STAILQ_INSERT_TAIL(&funixes, fx, next); 455 break; 456 } 457 case 'm': /* mark interval */ 458 MarkInterval = atoi(optarg) * 60; 459 break; 460 case 'N': 461 NoBind = 1; 462 SecureMode = 1; 463 break; 464 case 'n': 465 resolve = 0; 466 break; 467 case 'o': 468 use_bootfile = 1; 469 break; 470 case 'p': /* path */ 471 if (strlen(optarg) >= sizeof(sunx.sun_path)) 472 errx(1, "%s path too long, exiting", optarg); 473 funix_default.name = optarg; 474 break; 475 case 'P': /* path for alt. PID */ 476 PidFile = optarg; 477 break; 478 case 's': /* no network mode */ 479 SecureMode++; 480 break; 481 case 'S': /* path for privileged originator */ 482 if (strlen(optarg) >= sizeof(sunx.sun_path)) 483 errx(1, "%s path too long, exiting", optarg); 484 funix_secure.name = optarg; 485 break; 486 case 'T': 487 RemoteAddDate = 1; 488 break; 489 case 'u': /* only log specified priority */ 490 UniquePriority++; 491 break; 492 case 'v': /* log facility and priority */ 493 LogFacPri++; 494 break; 495 default: 496 usage(); 497 } 498 if ((argc -= optind) != 0) 499 usage(); 500 501 pfh = pidfile_open(PidFile, 0600, &spid); 502 if (pfh == NULL) { 503 if (errno == EEXIST) 504 errx(1, "syslogd already running, pid: %d", spid); 505 warn("cannot open pid file"); 506 } 507 508 if ((!Foreground) && (!Debug)) { 509 ppid = waitdaemon(0, 0, 30); 510 if (ppid < 0) { 511 warn("could not become daemon"); 512 pidfile_remove(pfh); 513 exit(1); 514 } 515 } else if (Debug) { 516 setlinebuf(stdout); 517 } 518 519 if (NumAllowed) 520 endservent(); 521 522 consfile.f_type = F_CONSOLE; 523 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 524 sizeof(consfile.f_un.f_fname)); 525 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 526 (void)signal(SIGTERM, dodie); 527 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 528 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 529 /* 530 * We don't want the SIGCHLD and SIGHUP handlers to interfere 531 * with each other; they are likely candidates for being called 532 * simultaneously (SIGHUP closes pipe descriptor, process dies, 533 * SIGCHLD happens). 534 */ 535 sigemptyset(&mask); 536 sigaddset(&mask, SIGHUP); 537 sact.sa_handler = reapchild; 538 sact.sa_mask = mask; 539 sact.sa_flags = SA_RESTART; 540 (void)sigaction(SIGCHLD, &sact, NULL); 541 (void)signal(SIGALRM, domark); 542 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 543 (void)alarm(TIMERINTVL); 544 545 TAILQ_INIT(&deadq_head); 546 547#ifndef SUN_LEN 548#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 549#endif 550 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 551 (void)unlink(fx->name); 552 memset(&sunx, 0, sizeof(sunx)); 553 sunx.sun_family = AF_LOCAL; 554 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 555 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 556 if (fx->s < 0 || 557 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 558 chmod(fx->name, fx->mode) < 0) { 559 (void)snprintf(line, sizeof line, 560 "cannot create %s", fx->name); 561 logerror(line); 562 dprintf("cannot create %s (%d)\n", fx->name, errno); 563 if (fx == &funix_default || fx == &funix_secure) 564 die(0); 565 else { 566 STAILQ_REMOVE(&funixes, fx, funix, next); 567 continue; 568 } 569 } 570 increase_rcvbuf(fx->s); 571 } 572 if (SecureMode <= 1) 573 finet = socksetup(family, bindhostname); 574 575 if (finet) { 576 if (SecureMode) { 577 for (i = 0; i < *finet; i++) { 578 if (shutdown(finet[i+1], SHUT_RD) < 0 && 579 errno != ENOTCONN) { 580 logerror("shutdown"); 581 if (!Debug) 582 die(0); 583 } 584 } 585 } else { 586 dprintf("listening on inet and/or inet6 socket\n"); 587 } 588 dprintf("sending on inet and/or inet6 socket\n"); 589 } 590 591 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 592 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 593 fklog = -1; 594 if (fklog < 0) 595 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 596 597 /* tuck my process id away */ 598 pidfile_write(pfh); 599 600 dprintf("off & running....\n"); 601 602 init(0); 603 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 604 sigemptyset(&mask); 605 sigaddset(&mask, SIGCHLD); 606 sact.sa_handler = init; 607 sact.sa_mask = mask; 608 sact.sa_flags = SA_RESTART; 609 (void)sigaction(SIGHUP, &sact, NULL); 610 611 tvp = &tv; 612 tv.tv_sec = tv.tv_usec = 0; 613 614 if (fklog != -1 && fklog > fdsrmax) 615 fdsrmax = fklog; 616 if (finet && !SecureMode) { 617 for (i = 0; i < *finet; i++) { 618 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 619 fdsrmax = finet[i+1]; 620 } 621 } 622 STAILQ_FOREACH(fx, &funixes, next) 623 if (fx->s > fdsrmax) 624 fdsrmax = fx->s; 625 626 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 627 sizeof(fd_mask)); 628 if (fdsr == NULL) 629 errx(1, "calloc fd_set"); 630 631 for (;;) { 632 if (MarkSet) 633 markit(); 634 if (WantDie) 635 die(WantDie); 636 637 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 638 sizeof(fd_mask)); 639 640 if (fklog != -1) 641 FD_SET(fklog, fdsr); 642 if (finet && !SecureMode) { 643 for (i = 0; i < *finet; i++) { 644 if (finet[i+1] != -1) 645 FD_SET(finet[i+1], fdsr); 646 } 647 } 648 STAILQ_FOREACH(fx, &funixes, next) 649 FD_SET(fx->s, fdsr); 650 651 i = select(fdsrmax+1, fdsr, NULL, NULL, 652 needdofsync ? &tv : tvp); 653 switch (i) { 654 case 0: 655 dofsync(); 656 needdofsync = 0; 657 if (tvp) { 658 tvp = NULL; 659 if (ppid != 1) 660 kill(ppid, SIGALRM); 661 } 662 continue; 663 case -1: 664 if (errno != EINTR) 665 logerror("select"); 666 continue; 667 } 668 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 669 readklog(); 670 if (finet && !SecureMode) { 671 for (i = 0; i < *finet; i++) { 672 if (FD_ISSET(finet[i+1], fdsr)) { 673 len = sizeof(frominet); 674 l = recvfrom(finet[i+1], line, MAXLINE, 675 0, (struct sockaddr *)&frominet, 676 &len); 677 if (l > 0) { 678 line[l] = '\0'; 679 hname = cvthname((struct sockaddr *)&frominet); 680 unmapped((struct sockaddr *)&frominet); 681 if (validate((struct sockaddr *)&frominet, hname)) 682 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 683 } else if (l < 0 && errno != EINTR) 684 logerror("recvfrom inet"); 685 } 686 } 687 } 688 STAILQ_FOREACH(fx, &funixes, next) { 689 if (FD_ISSET(fx->s, fdsr)) { 690 len = sizeof(fromunix); 691 l = recvfrom(fx->s, line, MAXLINE, 0, 692 (struct sockaddr *)&fromunix, &len); 693 if (l > 0) { 694 line[l] = '\0'; 695 printline(LocalHostName, line, 0); 696 } else if (l < 0 && errno != EINTR) 697 logerror("recvfrom unix"); 698 } 699 } 700 } 701 if (fdsr) 702 free(fdsr); 703} 704 705static void 706unmapped(struct sockaddr *sa) 707{ 708 struct sockaddr_in6 *sin6; 709 struct sockaddr_in sin4; 710 711 if (sa->sa_family != AF_INET6) 712 return; 713 if (sa->sa_len != sizeof(struct sockaddr_in6) || 714 sizeof(sin4) > sa->sa_len) 715 return; 716 sin6 = (struct sockaddr_in6 *)sa; 717 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 718 return; 719 720 memset(&sin4, 0, sizeof(sin4)); 721 sin4.sin_family = AF_INET; 722 sin4.sin_len = sizeof(struct sockaddr_in); 723 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 724 sizeof(sin4.sin_addr)); 725 sin4.sin_port = sin6->sin6_port; 726 727 memcpy(sa, &sin4, sin4.sin_len); 728} 729 730static void 731usage(void) 732{ 733 734 fprintf(stderr, "%s\n%s\n%s\n%s\n", 735 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 736 " [-b bind_address] [-f config_file]", 737 " [-l [mode:]path] [-m mark_interval]", 738 " [-P pid_file] [-p log_socket]"); 739 exit(1); 740} 741 742/* 743 * Take a raw input line, decode the message, and print the message 744 * on the appropriate log files. 745 */ 746static void 747printline(const char *hname, char *msg, int flags) 748{ 749 char *p, *q; 750 long n; 751 int c, pri; 752 char line[MAXLINE + 1]; 753 754 /* test for special codes */ 755 p = msg; 756 pri = DEFUPRI; 757 if (*p == '<') { 758 errno = 0; 759 n = strtol(p + 1, &q, 10); 760 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 761 p = q + 1; 762 pri = n; 763 } 764 } 765 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 766 pri = DEFUPRI; 767 768 /* 769 * Don't allow users to log kernel messages. 770 * NOTE: since LOG_KERN == 0 this will also match 771 * messages with no facility specified. 772 */ 773 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 774 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 775 776 q = line; 777 778 while ((c = (unsigned char)*p++) != '\0' && 779 q < &line[sizeof(line) - 4]) { 780 if (mask_C1 && (c & 0x80) && c < 0xA0) { 781 c &= 0x7F; 782 *q++ = 'M'; 783 *q++ = '-'; 784 } 785 if (isascii(c) && iscntrl(c)) { 786 if (c == '\n') { 787 *q++ = ' '; 788 } else if (c == '\t') { 789 *q++ = '\t'; 790 } else { 791 *q++ = '^'; 792 *q++ = c ^ 0100; 793 } 794 } else { 795 *q++ = c; 796 } 797 } 798 *q = '\0'; 799 800 logmsg(pri, line, hname, flags); 801} 802 803/* 804 * Read /dev/klog while data are available, split into lines. 805 */ 806static void 807readklog(void) 808{ 809 char *p, *q, line[MAXLINE + 1]; 810 int len, i; 811 812 len = 0; 813 for (;;) { 814 i = read(fklog, line + len, MAXLINE - 1 - len); 815 if (i > 0) { 816 line[i + len] = '\0'; 817 } else { 818 if (i < 0 && errno != EINTR && errno != EAGAIN) { 819 logerror("klog"); 820 fklog = -1; 821 } 822 break; 823 } 824 825 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 826 *q = '\0'; 827 printsys(p); 828 } 829 len = strlen(p); 830 if (len >= MAXLINE - 1) { 831 printsys(p); 832 len = 0; 833 } 834 if (len > 0) 835 memmove(line, p, len + 1); 836 } 837 if (len > 0) 838 printsys(line); 839} 840 841/* 842 * Take a raw input line from /dev/klog, format similar to syslog(). 843 */ 844static void 845printsys(char *msg) 846{ 847 char *p, *q; 848 long n; 849 int flags, isprintf, pri; 850 851 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 852 p = msg; 853 pri = DEFSPRI; 854 isprintf = 1; 855 if (*p == '<') { 856 errno = 0; 857 n = strtol(p + 1, &q, 10); 858 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 859 p = q + 1; 860 pri = n; 861 isprintf = 0; 862 } 863 } 864 /* 865 * Kernel printf's and LOG_CONSOLE messages have been displayed 866 * on the console already. 867 */ 868 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 869 flags |= IGN_CONS; 870 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 871 pri = DEFSPRI; 872 logmsg(pri, p, LocalHostName, flags); 873} 874 875static time_t now; 876 877/* 878 * Match a program or host name against a specification. 879 * Return a non-0 value if the message must be ignored 880 * based on the specification. 881 */ 882static int 883skip_message(const char *name, const char *spec, int checkcase) 884{ 885 const char *s; 886 char prev, next; 887 int exclude = 0; 888 /* Behaviour on explicit match */ 889 890 if (spec == NULL) 891 return 0; 892 switch (*spec) { 893 case '-': 894 exclude = 1; 895 /*FALLTHROUGH*/ 896 case '+': 897 spec++; 898 break; 899 default: 900 break; 901 } 902 if (checkcase) 903 s = strstr (spec, name); 904 else 905 s = strcasestr (spec, name); 906 907 if (s != NULL) { 908 prev = (s == spec ? ',' : *(s - 1)); 909 next = *(s + strlen (name)); 910 911 if (prev == ',' && (next == '\0' || next == ',')) 912 /* Explicit match: skip iff the spec is an 913 exclusive one. */ 914 return exclude; 915 } 916 917 /* No explicit match for this name: skip the message iff 918 the spec is an inclusive one. */ 919 return !exclude; 920} 921 922/* 923 * Log a message to the appropriate log files, users, etc. based on 924 * the priority. 925 */ 926static void 927logmsg(int pri, const char *msg, const char *from, int flags) 928{ 929 struct filed *f; 930 int i, fac, msglen, omask, prilev; 931 const char *timestamp; 932 char prog[NAME_MAX+1]; 933 char buf[MAXLINE+1]; 934 935 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 936 pri, flags, from, msg); 937 938 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 939 940 /* 941 * Check to see if msg looks non-standard. 942 */ 943 msglen = strlen(msg); 944 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 945 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 946 flags |= ADDDATE; 947 948 (void)time(&now); 949 if (flags & ADDDATE) { 950 timestamp = ctime(&now) + 4; 951 } else { 952 timestamp = msg; 953 msg += MAXDATELEN; 954 msglen -= MAXDATELEN; 955 } 956 957 /* skip leading blanks */ 958 while (isspace(*msg)) { 959 msg++; 960 msglen--; 961 } 962 963 /* extract facility and priority level */ 964 if (flags & MARK) 965 fac = LOG_NFACILITIES; 966 else 967 fac = LOG_FAC(pri); 968 969 /* Check maximum facility number. */ 970 if (fac > LOG_NFACILITIES) { 971 (void)sigsetmask(omask); 972 return; 973 } 974 975 prilev = LOG_PRI(pri); 976 977 /* extract program name */ 978 for (i = 0; i < NAME_MAX; i++) { 979 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 980 msg[i] == '/' || isspace(msg[i])) 981 break; 982 prog[i] = msg[i]; 983 } 984 prog[i] = 0; 985 986 /* add kernel prefix for kernel messages */ 987 if (flags & ISKERNEL) { 988 snprintf(buf, sizeof(buf), "%s: %s", 989 use_bootfile ? bootfile : "kernel", msg); 990 msg = buf; 991 msglen = strlen(buf); 992 } 993 994 /* log the message to the particular outputs */ 995 if (!Initialized) { 996 f = &consfile; 997 /* 998 * Open in non-blocking mode to avoid hangs during open 999 * and close(waiting for the port to drain). 1000 */ 1001 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1002 1003 if (f->f_file >= 0) { 1004 (void)strlcpy(f->f_lasttime, timestamp, 1005 sizeof(f->f_lasttime)); 1006 fprintlog(f, flags, msg); 1007 close(f->f_file); 1008 f->f_file = -1; 1009 } 1010 (void)sigsetmask(omask); 1011 return; 1012 } 1013 for (f = Files; f; f = f->f_next) { 1014 /* skip messages that are incorrect priority */ 1015 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1016 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1017 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1018 ) 1019 || f->f_pmask[fac] == INTERNAL_NOPRI) 1020 continue; 1021 1022 /* skip messages with the incorrect hostname */ 1023 if (skip_message(from, f->f_host, 0)) 1024 continue; 1025 1026 /* skip messages with the incorrect program name */ 1027 if (skip_message(prog, f->f_program, 1)) 1028 continue; 1029 1030 /* skip message to console if it has already been printed */ 1031 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1032 continue; 1033 1034 /* don't output marks to recently written files */ 1035 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1036 continue; 1037 1038 /* 1039 * suppress duplicate lines to this file 1040 */ 1041 if (no_compress - (f->f_type != F_PIPE) < 1 && 1042 (flags & MARK) == 0 && msglen == f->f_prevlen && 1043 !strcmp(msg, f->f_prevline) && 1044 !strcasecmp(from, f->f_prevhost)) { 1045 (void)strlcpy(f->f_lasttime, timestamp, 1046 sizeof(f->f_lasttime)); 1047 f->f_prevcount++; 1048 dprintf("msg repeated %d times, %ld sec of %d\n", 1049 f->f_prevcount, (long)(now - f->f_time), 1050 repeatinterval[f->f_repeatcount]); 1051 /* 1052 * If domark would have logged this by now, 1053 * flush it now (so we don't hold isolated messages), 1054 * but back off so we'll flush less often 1055 * in the future. 1056 */ 1057 if (now > REPEATTIME(f)) { 1058 fprintlog(f, flags, (char *)NULL); 1059 BACKOFF(f); 1060 } 1061 } else { 1062 /* new line, save it */ 1063 if (f->f_prevcount) 1064 fprintlog(f, 0, (char *)NULL); 1065 f->f_repeatcount = 0; 1066 f->f_prevpri = pri; 1067 (void)strlcpy(f->f_lasttime, timestamp, 1068 sizeof(f->f_lasttime)); 1069 (void)strlcpy(f->f_prevhost, from, 1070 sizeof(f->f_prevhost)); 1071 if (msglen < MAXSVLINE) { 1072 f->f_prevlen = msglen; 1073 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1074 fprintlog(f, flags, (char *)NULL); 1075 } else { 1076 f->f_prevline[0] = 0; 1077 f->f_prevlen = 0; 1078 fprintlog(f, flags, msg); 1079 } 1080 } 1081 } 1082 (void)sigsetmask(omask); 1083} 1084 1085static void 1086dofsync(void) 1087{ 1088 struct filed *f; 1089 1090 for (f = Files; f; f = f->f_next) { 1091 if ((f->f_type == F_FILE) && 1092 (f->f_flags & FFLAG_NEEDSYNC)) { 1093 f->f_flags &= ~FFLAG_NEEDSYNC; 1094 (void)fsync(f->f_file); 1095 } 1096 } 1097} 1098 1099#define IOV_SIZE 7 1100static void 1101fprintlog(struct filed *f, int flags, const char *msg) 1102{ 1103 struct iovec iov[IOV_SIZE]; 1104 struct iovec *v; 1105 struct addrinfo *r; 1106 int i, l, lsent = 0; 1107 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1108 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1109 const char *msgret; 1110 1111 v = iov; 1112 if (f->f_type == F_WALL) { 1113 v->iov_base = greetings; 1114 /* The time displayed is not synchornized with the other log 1115 * destinations (like messages). Following fragment was using 1116 * ctime(&now), which was updating the time every 30 sec. 1117 * With f_lasttime, time is synchronized correctly. 1118 */ 1119 v->iov_len = snprintf(greetings, sizeof greetings, 1120 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1121 f->f_prevhost, f->f_lasttime); 1122 if (v->iov_len >= sizeof greetings) 1123 v->iov_len = sizeof greetings - 1; 1124 v++; 1125 v->iov_base = nul; 1126 v->iov_len = 0; 1127 v++; 1128 } else { 1129 v->iov_base = f->f_lasttime; 1130 v->iov_len = strlen(f->f_lasttime); 1131 v++; 1132 v->iov_base = space; 1133 v->iov_len = 1; 1134 v++; 1135 } 1136 1137 if (LogFacPri) { 1138 static char fp_buf[30]; /* Hollow laugh */ 1139 int fac = f->f_prevpri & LOG_FACMASK; 1140 int pri = LOG_PRI(f->f_prevpri); 1141 const char *f_s = NULL; 1142 char f_n[5]; /* Hollow laugh */ 1143 const char *p_s = NULL; 1144 char p_n[5]; /* Hollow laugh */ 1145 1146 if (LogFacPri > 1) { 1147 const CODE *c; 1148 1149 for (c = facilitynames; c->c_name; c++) { 1150 if (c->c_val == fac) { 1151 f_s = c->c_name; 1152 break; 1153 } 1154 } 1155 for (c = prioritynames; c->c_name; c++) { 1156 if (c->c_val == pri) { 1157 p_s = c->c_name; 1158 break; 1159 } 1160 } 1161 } 1162 if (!f_s) { 1163 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1164 f_s = f_n; 1165 } 1166 if (!p_s) { 1167 snprintf(p_n, sizeof p_n, "%d", pri); 1168 p_s = p_n; 1169 } 1170 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1171 v->iov_base = fp_buf; 1172 v->iov_len = strlen(fp_buf); 1173 } else { 1174 v->iov_base = nul; 1175 v->iov_len = 0; 1176 } 1177 v++; 1178 1179 v->iov_base = f->f_prevhost; 1180 v->iov_len = strlen(v->iov_base); 1181 v++; 1182 v->iov_base = space; 1183 v->iov_len = 1; 1184 v++; 1185 1186 if (msg) { 1187 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1188 if (wmsg == NULL) { 1189 logerror("strdup"); 1190 exit(1); 1191 } 1192 v->iov_base = wmsg; 1193 v->iov_len = strlen(msg); 1194 } else if (f->f_prevcount > 1) { 1195 v->iov_base = repbuf; 1196 v->iov_len = snprintf(repbuf, sizeof repbuf, 1197 "last message repeated %d times", f->f_prevcount); 1198 } else { 1199 v->iov_base = f->f_prevline; 1200 v->iov_len = f->f_prevlen; 1201 } 1202 v++; 1203 1204 dprintf("Logging to %s", TypeNames[f->f_type]); 1205 f->f_time = now; 1206 1207 switch (f->f_type) { 1208 int port; 1209 case F_UNUSED: 1210 dprintf("\n"); 1211 break; 1212 1213 case F_FORW: 1214 port = (int)ntohs(((struct sockaddr_in *) 1215 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1216 if (port != 514) { 1217 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1218 } else { 1219 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1220 } 1221 /* check for local vs remote messages */ 1222 if (strcasecmp(f->f_prevhost, LocalHostName)) 1223 l = snprintf(line, sizeof line - 1, 1224 "<%d>%.15s Forwarded from %s: %s", 1225 f->f_prevpri, (char *)iov[0].iov_base, 1226 f->f_prevhost, (char *)iov[5].iov_base); 1227 else 1228 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1229 f->f_prevpri, (char *)iov[0].iov_base, 1230 (char *)iov[5].iov_base); 1231 if (l < 0) 1232 l = 0; 1233 else if (l > MAXLINE) 1234 l = MAXLINE; 1235 1236 if (finet) { 1237 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1238 for (i = 0; i < *finet; i++) { 1239#if 0 1240 /* 1241 * should we check AF first, or just 1242 * trial and error? FWD 1243 */ 1244 if (r->ai_family == 1245 address_family_of(finet[i+1])) 1246#endif 1247 lsent = sendto(finet[i+1], line, l, 0, 1248 r->ai_addr, r->ai_addrlen); 1249 if (lsent == l) 1250 break; 1251 } 1252 if (lsent == l && !send_to_all) 1253 break; 1254 } 1255 dprintf("lsent/l: %d/%d\n", lsent, l); 1256 if (lsent != l) { 1257 int e = errno; 1258 logerror("sendto"); 1259 errno = e; 1260 switch (errno) { 1261 case ENOBUFS: 1262 case ENETDOWN: 1263 case ENETUNREACH: 1264 case EHOSTUNREACH: 1265 case EHOSTDOWN: 1266 case EADDRNOTAVAIL: 1267 break; 1268 /* case EBADF: */ 1269 /* case EACCES: */ 1270 /* case ENOTSOCK: */ 1271 /* case EFAULT: */ 1272 /* case EMSGSIZE: */ 1273 /* case EAGAIN: */ 1274 /* case ENOBUFS: */ 1275 /* case ECONNREFUSED: */ 1276 default: 1277 dprintf("removing entry: errno=%d\n", e); 1278 f->f_type = F_UNUSED; 1279 break; 1280 } 1281 } 1282 } 1283 break; 1284 1285 case F_FILE: 1286 dprintf(" %s\n", f->f_un.f_fname); 1287 v->iov_base = lf; 1288 v->iov_len = 1; 1289 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1290 /* 1291 * If writev(2) fails for potentially transient errors 1292 * like the filesystem being full, ignore it. 1293 * Otherwise remove this logfile from the list. 1294 */ 1295 if (errno != ENOSPC) { 1296 int e = errno; 1297 close_filed(f); 1298 errno = e; 1299 logerror(f->f_un.f_fname); 1300 } 1301 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1302 f->f_flags |= FFLAG_NEEDSYNC; 1303 needdofsync = 1; 1304 } 1305 break; 1306 1307 case F_PIPE: 1308 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1309 v->iov_base = lf; 1310 v->iov_len = 1; 1311 if (f->f_un.f_pipe.f_pid == 0) { 1312 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1313 &f->f_un.f_pipe.f_pid)) < 0) { 1314 f->f_type = F_UNUSED; 1315 logerror(f->f_un.f_pipe.f_pname); 1316 break; 1317 } 1318 } 1319 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1320 int e = errno; 1321 close_filed(f); 1322 if (f->f_un.f_pipe.f_pid > 0) 1323 deadq_enter(f->f_un.f_pipe.f_pid, 1324 f->f_un.f_pipe.f_pname); 1325 f->f_un.f_pipe.f_pid = 0; 1326 errno = e; 1327 logerror(f->f_un.f_pipe.f_pname); 1328 } 1329 break; 1330 1331 case F_CONSOLE: 1332 if (flags & IGN_CONS) { 1333 dprintf(" (ignored)\n"); 1334 break; 1335 } 1336 /* FALLTHROUGH */ 1337 1338 case F_TTY: 1339 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1340 v->iov_base = crlf; 1341 v->iov_len = 2; 1342 1343 errno = 0; /* ttymsg() only sometimes returns an errno */ 1344 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1345 f->f_type = F_UNUSED; 1346 logerror(msgret); 1347 } 1348 break; 1349 1350 case F_USERS: 1351 case F_WALL: 1352 dprintf("\n"); 1353 v->iov_base = crlf; 1354 v->iov_len = 2; 1355 wallmsg(f, iov, IOV_SIZE); 1356 break; 1357 } 1358 f->f_prevcount = 0; 1359 free(wmsg); 1360} 1361 1362/* 1363 * WALLMSG -- Write a message to the world at large 1364 * 1365 * Write the specified message to either the entire 1366 * world, or a list of approved users. 1367 */ 1368static void 1369wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1370{ 1371 static int reenter; /* avoid calling ourselves */ 1372 struct utmpx *ut; 1373 int i; 1374 const char *p; 1375 1376 if (reenter++) 1377 return; 1378 setutxent(); 1379 /* NOSTRICT */ 1380 while ((ut = getutxent()) != NULL) { 1381 if (ut->ut_type != USER_PROCESS) 1382 continue; 1383 if (f->f_type == F_WALL) { 1384 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1385 TTYMSGTIME)) != NULL) { 1386 errno = 0; /* already in msg */ 1387 logerror(p); 1388 } 1389 continue; 1390 } 1391 /* should we send the message to this user? */ 1392 for (i = 0; i < MAXUNAMES; i++) { 1393 if (!f->f_un.f_uname[i][0]) 1394 break; 1395 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1396 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1397 TTYMSGTIME)) != NULL) { 1398 errno = 0; /* already in msg */ 1399 logerror(p); 1400 } 1401 break; 1402 } 1403 } 1404 } 1405 endutxent(); 1406 reenter = 0; 1407} 1408 1409static void 1410reapchild(int signo __unused) 1411{ 1412 int status; 1413 pid_t pid; 1414 struct filed *f; 1415 1416 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1417 if (!Initialized) 1418 /* Don't tell while we are initting. */ 1419 continue; 1420 1421 /* First, look if it's a process from the dead queue. */ 1422 if (deadq_remove(pid)) 1423 goto oncemore; 1424 1425 /* Now, look in list of active processes. */ 1426 for (f = Files; f; f = f->f_next) 1427 if (f->f_type == F_PIPE && 1428 f->f_un.f_pipe.f_pid == pid) { 1429 close_filed(f); 1430 f->f_un.f_pipe.f_pid = 0; 1431 log_deadchild(pid, status, 1432 f->f_un.f_pipe.f_pname); 1433 break; 1434 } 1435 oncemore: 1436 continue; 1437 } 1438} 1439 1440/* 1441 * Return a printable representation of a host address. 1442 */ 1443static const char * 1444cvthname(struct sockaddr *f) 1445{ 1446 int error, hl; 1447 sigset_t omask, nmask; 1448 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1449 1450 error = getnameinfo((struct sockaddr *)f, 1451 ((struct sockaddr *)f)->sa_len, 1452 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1453 dprintf("cvthname(%s)\n", ip); 1454 1455 if (error) { 1456 dprintf("Malformed from address %s\n", gai_strerror(error)); 1457 return ("???"); 1458 } 1459 if (!resolve) 1460 return (ip); 1461 1462 sigemptyset(&nmask); 1463 sigaddset(&nmask, SIGHUP); 1464 sigprocmask(SIG_BLOCK, &nmask, &omask); 1465 error = getnameinfo((struct sockaddr *)f, 1466 ((struct sockaddr *)f)->sa_len, 1467 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1468 sigprocmask(SIG_SETMASK, &omask, NULL); 1469 if (error) { 1470 dprintf("Host name for your address (%s) unknown\n", ip); 1471 return (ip); 1472 } 1473 hl = strlen(hname); 1474 if (hl > 0 && hname[hl-1] == '.') 1475 hname[--hl] = '\0'; 1476 trimdomain(hname, hl); 1477 return (hname); 1478} 1479 1480static void 1481dodie(int signo) 1482{ 1483 1484 WantDie = signo; 1485} 1486 1487static void 1488domark(int signo __unused) 1489{ 1490 1491 MarkSet = 1; 1492} 1493 1494/* 1495 * Print syslogd errors some place. 1496 */ 1497static void 1498logerror(const char *type) 1499{ 1500 char buf[512]; 1501 static int recursed = 0; 1502 1503 /* If there's an error while trying to log an error, give up. */ 1504 if (recursed) 1505 return; 1506 recursed++; 1507 if (errno) 1508 (void)snprintf(buf, 1509 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1510 else 1511 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1512 errno = 0; 1513 dprintf("%s\n", buf); 1514 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1515 recursed--; 1516} 1517 1518static void 1519die(int signo) 1520{ 1521 struct filed *f; 1522 struct funix *fx; 1523 int was_initialized; 1524 char buf[100]; 1525 1526 was_initialized = Initialized; 1527 Initialized = 0; /* Don't log SIGCHLDs. */ 1528 for (f = Files; f != NULL; f = f->f_next) { 1529 /* flush any pending output */ 1530 if (f->f_prevcount) 1531 fprintlog(f, 0, (char *)NULL); 1532 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1533 close_filed(f); 1534 f->f_un.f_pipe.f_pid = 0; 1535 } 1536 } 1537 Initialized = was_initialized; 1538 if (signo) { 1539 dprintf("syslogd: exiting on signal %d\n", signo); 1540 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1541 errno = 0; 1542 logerror(buf); 1543 } 1544 STAILQ_FOREACH(fx, &funixes, next) 1545 (void)unlink(fx->name); 1546 pidfile_remove(pfh); 1547 1548 exit(1); 1549} 1550 1551/* 1552 * INIT -- Initialize syslogd from configuration table 1553 */ 1554static void 1555init(int signo) 1556{ 1557 int i; 1558 FILE *cf; 1559 struct filed *f, *next, **nextp; 1560 char *p; 1561 char cline[LINE_MAX]; 1562 char prog[LINE_MAX]; 1563 char host[MAXHOSTNAMELEN]; 1564 char oldLocalHostName[MAXHOSTNAMELEN]; 1565 char hostMsg[2*MAXHOSTNAMELEN+40]; 1566 char bootfileMsg[LINE_MAX]; 1567 1568 dprintf("init\n"); 1569 1570 /* 1571 * Load hostname (may have changed). 1572 */ 1573 if (signo != 0) 1574 (void)strlcpy(oldLocalHostName, LocalHostName, 1575 sizeof(oldLocalHostName)); 1576 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1577 err(EX_OSERR, "gethostname() failed"); 1578 if ((p = strchr(LocalHostName, '.')) != NULL) { 1579 *p++ = '\0'; 1580 LocalDomain = p; 1581 } else { 1582 LocalDomain = ""; 1583 } 1584 1585 /* 1586 * Close all open log files. 1587 */ 1588 Initialized = 0; 1589 for (f = Files; f != NULL; f = next) { 1590 /* flush any pending output */ 1591 if (f->f_prevcount) 1592 fprintlog(f, 0, (char *)NULL); 1593 1594 switch (f->f_type) { 1595 case F_FILE: 1596 case F_FORW: 1597 case F_CONSOLE: 1598 case F_TTY: 1599 close_filed(f); 1600 break; 1601 case F_PIPE: 1602 if (f->f_un.f_pipe.f_pid > 0) { 1603 close_filed(f); 1604 deadq_enter(f->f_un.f_pipe.f_pid, 1605 f->f_un.f_pipe.f_pname); 1606 } 1607 f->f_un.f_pipe.f_pid = 0; 1608 break; 1609 } 1610 next = f->f_next; 1611 if (f->f_program) free(f->f_program); 1612 if (f->f_host) free(f->f_host); 1613 free((char *)f); 1614 } 1615 Files = NULL; 1616 nextp = &Files; 1617 1618 /* open the configuration file */ 1619 if ((cf = fopen(ConfFile, "r")) == NULL) { 1620 dprintf("cannot open %s\n", ConfFile); 1621 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1622 if (*nextp == NULL) { 1623 logerror("calloc"); 1624 exit(1); 1625 } 1626 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1627 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1628 if ((*nextp)->f_next == NULL) { 1629 logerror("calloc"); 1630 exit(1); 1631 } 1632 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1633 Initialized = 1; 1634 return; 1635 } 1636 1637 /* 1638 * Foreach line in the conf table, open that file. 1639 */ 1640 f = NULL; 1641 (void)strlcpy(host, "*", sizeof(host)); 1642 (void)strlcpy(prog, "*", sizeof(prog)); 1643 while (fgets(cline, sizeof(cline), cf) != NULL) { 1644 /* 1645 * check for end-of-section, comments, strip off trailing 1646 * spaces and newline character. #!prog is treated specially: 1647 * following lines apply only to that program. 1648 */ 1649 for (p = cline; isspace(*p); ++p) 1650 continue; 1651 if (*p == 0) 1652 continue; 1653 if (*p == '#') { 1654 p++; 1655 if (*p != '!' && *p != '+' && *p != '-') 1656 continue; 1657 } 1658 if (*p == '+' || *p == '-') { 1659 host[0] = *p++; 1660 while (isspace(*p)) 1661 p++; 1662 if ((!*p) || (*p == '*')) { 1663 (void)strlcpy(host, "*", sizeof(host)); 1664 continue; 1665 } 1666 if (*p == '@') 1667 p = LocalHostName; 1668 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1669 if (!isalnum(*p) && *p != '.' && *p != '-' 1670 && *p != ',' && *p != ':' && *p != '%') 1671 break; 1672 host[i] = *p++; 1673 } 1674 host[i] = '\0'; 1675 continue; 1676 } 1677 if (*p == '!') { 1678 p++; 1679 while (isspace(*p)) p++; 1680 if ((!*p) || (*p == '*')) { 1681 (void)strlcpy(prog, "*", sizeof(prog)); 1682 continue; 1683 } 1684 for (i = 0; i < LINE_MAX - 1; i++) { 1685 if (!isprint(p[i]) || isspace(p[i])) 1686 break; 1687 prog[i] = p[i]; 1688 } 1689 prog[i] = 0; 1690 continue; 1691 } 1692 for (p = cline + 1; *p != '\0'; p++) { 1693 if (*p != '#') 1694 continue; 1695 if (*(p - 1) == '\\') { 1696 strcpy(p - 1, p); 1697 p--; 1698 continue; 1699 } 1700 *p = '\0'; 1701 break; 1702 } 1703 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1704 cline[i] = '\0'; 1705 f = (struct filed *)calloc(1, sizeof(*f)); 1706 if (f == NULL) { 1707 logerror("calloc"); 1708 exit(1); 1709 } 1710 *nextp = f; 1711 nextp = &f->f_next; 1712 cfline(cline, f, prog, host); 1713 } 1714 1715 /* close the configuration file */ 1716 (void)fclose(cf); 1717 1718 Initialized = 1; 1719 1720 if (Debug) { 1721 int port; 1722 for (f = Files; f; f = f->f_next) { 1723 for (i = 0; i <= LOG_NFACILITIES; i++) 1724 if (f->f_pmask[i] == INTERNAL_NOPRI) 1725 printf("X "); 1726 else 1727 printf("%d ", f->f_pmask[i]); 1728 printf("%s: ", TypeNames[f->f_type]); 1729 switch (f->f_type) { 1730 case F_FILE: 1731 printf("%s", f->f_un.f_fname); 1732 break; 1733 1734 case F_CONSOLE: 1735 case F_TTY: 1736 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1737 break; 1738 1739 case F_FORW: 1740 port = (int)ntohs(((struct sockaddr_in *) 1741 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1742 if (port != 514) { 1743 printf("%s:%d", 1744 f->f_un.f_forw.f_hname, port); 1745 } else { 1746 printf("%s", f->f_un.f_forw.f_hname); 1747 } 1748 break; 1749 1750 case F_PIPE: 1751 printf("%s", f->f_un.f_pipe.f_pname); 1752 break; 1753 1754 case F_USERS: 1755 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1756 printf("%s, ", f->f_un.f_uname[i]); 1757 break; 1758 } 1759 if (f->f_program) 1760 printf(" (%s)", f->f_program); 1761 printf("\n"); 1762 } 1763 } 1764 1765 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1766 dprintf("syslogd: restarted\n"); 1767 /* 1768 * Log a change in hostname, but only on a restart. 1769 */ 1770 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1771 (void)snprintf(hostMsg, sizeof(hostMsg), 1772 "syslogd: hostname changed, \"%s\" to \"%s\"", 1773 oldLocalHostName, LocalHostName); 1774 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1775 dprintf("%s\n", hostMsg); 1776 } 1777 /* 1778 * Log the kernel boot file if we aren't going to use it as 1779 * the prefix, and if this is *not* a restart. 1780 */ 1781 if (signo == 0 && !use_bootfile) { 1782 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1783 "syslogd: kernel boot file is %s", bootfile); 1784 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1785 dprintf("%s\n", bootfileMsg); 1786 } 1787} 1788 1789/* 1790 * Crack a configuration file line 1791 */ 1792static void 1793cfline(const char *line, struct filed *f, const char *prog, const char *host) 1794{ 1795 struct addrinfo hints, *res; 1796 int error, i, pri, syncfile; 1797 const char *p, *q; 1798 char *bp; 1799 char buf[MAXLINE], ebuf[100]; 1800 1801 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1802 1803 errno = 0; /* keep strerror() stuff out of logerror messages */ 1804 1805 /* clear out file entry */ 1806 memset(f, 0, sizeof(*f)); 1807 for (i = 0; i <= LOG_NFACILITIES; i++) 1808 f->f_pmask[i] = INTERNAL_NOPRI; 1809 1810 /* save hostname if any */ 1811 if (host && *host == '*') 1812 host = NULL; 1813 if (host) { 1814 int hl; 1815 1816 f->f_host = strdup(host); 1817 if (f->f_host == NULL) { 1818 logerror("strdup"); 1819 exit(1); 1820 } 1821 hl = strlen(f->f_host); 1822 if (hl > 0 && f->f_host[hl-1] == '.') 1823 f->f_host[--hl] = '\0'; 1824 trimdomain(f->f_host, hl); 1825 } 1826 1827 /* save program name if any */ 1828 if (prog && *prog == '*') 1829 prog = NULL; 1830 if (prog) { 1831 f->f_program = strdup(prog); 1832 if (f->f_program == NULL) { 1833 logerror("strdup"); 1834 exit(1); 1835 } 1836 } 1837 1838 /* scan through the list of selectors */ 1839 for (p = line; *p && *p != '\t' && *p != ' ';) { 1840 int pri_done; 1841 int pri_cmp; 1842 int pri_invert; 1843 1844 /* find the end of this facility name list */ 1845 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1846 continue; 1847 1848 /* get the priority comparison */ 1849 pri_cmp = 0; 1850 pri_done = 0; 1851 pri_invert = 0; 1852 if (*q == '!') { 1853 pri_invert = 1; 1854 q++; 1855 } 1856 while (!pri_done) { 1857 switch (*q) { 1858 case '<': 1859 pri_cmp |= PRI_LT; 1860 q++; 1861 break; 1862 case '=': 1863 pri_cmp |= PRI_EQ; 1864 q++; 1865 break; 1866 case '>': 1867 pri_cmp |= PRI_GT; 1868 q++; 1869 break; 1870 default: 1871 pri_done++; 1872 break; 1873 } 1874 } 1875 1876 /* collect priority name */ 1877 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1878 *bp++ = *q++; 1879 *bp = '\0'; 1880 1881 /* skip cruft */ 1882 while (strchr(",;", *q)) 1883 q++; 1884 1885 /* decode priority name */ 1886 if (*buf == '*') { 1887 pri = LOG_PRIMASK; 1888 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1889 } else { 1890 /* Ignore trailing spaces. */ 1891 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1892 buf[i] = '\0'; 1893 1894 pri = decode(buf, prioritynames); 1895 if (pri < 0) { 1896 errno = 0; 1897 (void)snprintf(ebuf, sizeof ebuf, 1898 "unknown priority name \"%s\"", buf); 1899 logerror(ebuf); 1900 return; 1901 } 1902 } 1903 if (!pri_cmp) 1904 pri_cmp = (UniquePriority) 1905 ? (PRI_EQ) 1906 : (PRI_EQ | PRI_GT) 1907 ; 1908 if (pri_invert) 1909 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1910 1911 /* scan facilities */ 1912 while (*p && !strchr("\t.; ", *p)) { 1913 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1914 *bp++ = *p++; 1915 *bp = '\0'; 1916 1917 if (*buf == '*') { 1918 for (i = 0; i < LOG_NFACILITIES; i++) { 1919 f->f_pmask[i] = pri; 1920 f->f_pcmp[i] = pri_cmp; 1921 } 1922 } else { 1923 i = decode(buf, facilitynames); 1924 if (i < 0) { 1925 errno = 0; 1926 (void)snprintf(ebuf, sizeof ebuf, 1927 "unknown facility name \"%s\"", 1928 buf); 1929 logerror(ebuf); 1930 return; 1931 } 1932 f->f_pmask[i >> 3] = pri; 1933 f->f_pcmp[i >> 3] = pri_cmp; 1934 } 1935 while (*p == ',' || *p == ' ') 1936 p++; 1937 } 1938 1939 p = q; 1940 } 1941 1942 /* skip to action part */ 1943 while (*p == '\t' || *p == ' ') 1944 p++; 1945 1946 if (*p == '-') { 1947 syncfile = 0; 1948 p++; 1949 } else 1950 syncfile = 1; 1951 1952 switch (*p) { 1953 case '@': 1954 { 1955 char *tp; 1956 char endkey = ':'; 1957 /* 1958 * scan forward to see if there is a port defined. 1959 * so we can't use strlcpy.. 1960 */ 1961 i = sizeof(f->f_un.f_forw.f_hname); 1962 tp = f->f_un.f_forw.f_hname; 1963 p++; 1964 1965 /* 1966 * an ipv6 address should start with a '[' in that case 1967 * we should scan for a ']' 1968 */ 1969 if (*p == '[') { 1970 p++; 1971 endkey = ']'; 1972 } 1973 while (*p && (*p != endkey) && (i-- > 0)) { 1974 *tp++ = *p++; 1975 } 1976 if (endkey == ']' && *p == endkey) 1977 p++; 1978 *tp = '\0'; 1979 } 1980 /* See if we copied a domain and have a port */ 1981 if (*p == ':') 1982 p++; 1983 else 1984 p = NULL; 1985 1986 memset(&hints, 0, sizeof(hints)); 1987 hints.ai_family = family; 1988 hints.ai_socktype = SOCK_DGRAM; 1989 error = getaddrinfo(f->f_un.f_forw.f_hname, 1990 p ? p : "syslog", &hints, &res); 1991 if (error) { 1992 logerror(gai_strerror(error)); 1993 break; 1994 } 1995 f->f_un.f_forw.f_addr = res; 1996 f->f_type = F_FORW; 1997 break; 1998 1999 case '/': 2000 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2001 f->f_type = F_UNUSED; 2002 logerror(p); 2003 break; 2004 } 2005 if (syncfile) 2006 f->f_flags |= FFLAG_SYNC; 2007 if (isatty(f->f_file)) { 2008 if (strcmp(p, ctty) == 0) 2009 f->f_type = F_CONSOLE; 2010 else 2011 f->f_type = F_TTY; 2012 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2013 sizeof(f->f_un.f_fname)); 2014 } else { 2015 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2016 f->f_type = F_FILE; 2017 } 2018 break; 2019 2020 case '|': 2021 f->f_un.f_pipe.f_pid = 0; 2022 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2023 sizeof(f->f_un.f_pipe.f_pname)); 2024 f->f_type = F_PIPE; 2025 break; 2026 2027 case '*': 2028 f->f_type = F_WALL; 2029 break; 2030 2031 default: 2032 for (i = 0; i < MAXUNAMES && *p; i++) { 2033 for (q = p; *q && *q != ','; ) 2034 q++; 2035 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2036 if ((q - p) >= MAXLOGNAME) 2037 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2038 else 2039 f->f_un.f_uname[i][q - p] = '\0'; 2040 while (*q == ',' || *q == ' ') 2041 q++; 2042 p = q; 2043 } 2044 f->f_type = F_USERS; 2045 break; 2046 } 2047} 2048 2049 2050/* 2051 * Decode a symbolic name to a numeric value 2052 */ 2053static int 2054decode(const char *name, const CODE *codetab) 2055{ 2056 const CODE *c; 2057 char *p, buf[40]; 2058 2059 if (isdigit(*name)) 2060 return (atoi(name)); 2061 2062 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2063 if (isupper(*name)) 2064 *p = tolower(*name); 2065 else 2066 *p = *name; 2067 } 2068 *p = '\0'; 2069 for (c = codetab; c->c_name; c++) 2070 if (!strcmp(buf, c->c_name)) 2071 return (c->c_val); 2072 2073 return (-1); 2074} 2075 2076static void 2077markit(void) 2078{ 2079 struct filed *f; 2080 dq_t q, next; 2081 2082 now = time((time_t *)NULL); 2083 MarkSeq += TIMERINTVL; 2084 if (MarkSeq >= MarkInterval) { 2085 logmsg(LOG_INFO, "-- MARK --", 2086 LocalHostName, ADDDATE|MARK); 2087 MarkSeq = 0; 2088 } 2089 2090 for (f = Files; f; f = f->f_next) { 2091 if (f->f_prevcount && now >= REPEATTIME(f)) { 2092 dprintf("flush %s: repeated %d times, %d sec.\n", 2093 TypeNames[f->f_type], f->f_prevcount, 2094 repeatinterval[f->f_repeatcount]); 2095 fprintlog(f, 0, (char *)NULL); 2096 BACKOFF(f); 2097 } 2098 } 2099 2100 /* Walk the dead queue, and see if we should signal somebody. */ 2101 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2102 next = TAILQ_NEXT(q, dq_entries); 2103 2104 switch (q->dq_timeout) { 2105 case 0: 2106 /* Already signalled once, try harder now. */ 2107 if (kill(q->dq_pid, SIGKILL) != 0) 2108 (void)deadq_remove(q->dq_pid); 2109 break; 2110 2111 case 1: 2112 /* 2113 * Timed out on dead queue, send terminate 2114 * signal. Note that we leave the removal 2115 * from the dead queue to reapchild(), which 2116 * will also log the event (unless the process 2117 * didn't even really exist, in case we simply 2118 * drop it from the dead queue). 2119 */ 2120 if (kill(q->dq_pid, SIGTERM) != 0) 2121 (void)deadq_remove(q->dq_pid); 2122 /* FALLTHROUGH */ 2123 2124 default: 2125 q->dq_timeout--; 2126 } 2127 } 2128 MarkSet = 0; 2129 (void)alarm(TIMERINTVL); 2130} 2131 2132/* 2133 * fork off and become a daemon, but wait for the child to come online 2134 * before returning to the parent, or we get disk thrashing at boot etc. 2135 * Set a timer so we don't hang forever if it wedges. 2136 */ 2137static int 2138waitdaemon(int nochdir, int noclose, int maxwait) 2139{ 2140 int fd; 2141 int status; 2142 pid_t pid, childpid; 2143 2144 switch (childpid = fork()) { 2145 case -1: 2146 return (-1); 2147 case 0: 2148 break; 2149 default: 2150 signal(SIGALRM, timedout); 2151 alarm(maxwait); 2152 while ((pid = wait3(&status, 0, NULL)) != -1) { 2153 if (WIFEXITED(status)) 2154 errx(1, "child pid %d exited with return code %d", 2155 pid, WEXITSTATUS(status)); 2156 if (WIFSIGNALED(status)) 2157 errx(1, "child pid %d exited on signal %d%s", 2158 pid, WTERMSIG(status), 2159 WCOREDUMP(status) ? " (core dumped)" : 2160 ""); 2161 if (pid == childpid) /* it's gone... */ 2162 break; 2163 } 2164 exit(0); 2165 } 2166 2167 if (setsid() == -1) 2168 return (-1); 2169 2170 if (!nochdir) 2171 (void)chdir("/"); 2172 2173 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2174 (void)dup2(fd, STDIN_FILENO); 2175 (void)dup2(fd, STDOUT_FILENO); 2176 (void)dup2(fd, STDERR_FILENO); 2177 if (fd > 2) 2178 (void)close (fd); 2179 } 2180 return (getppid()); 2181} 2182 2183/* 2184 * We get a SIGALRM from the child when it's running and finished doing it's 2185 * fsync()'s or O_SYNC writes for all the boot messages. 2186 * 2187 * We also get a signal from the kernel if the timer expires, so check to 2188 * see what happened. 2189 */ 2190static void 2191timedout(int sig __unused) 2192{ 2193 int left; 2194 left = alarm(0); 2195 signal(SIGALRM, SIG_DFL); 2196 if (left == 0) 2197 errx(1, "timed out waiting for child"); 2198 else 2199 _exit(0); 2200} 2201 2202/* 2203 * Add `s' to the list of allowable peer addresses to accept messages 2204 * from. 2205 * 2206 * `s' is a string in the form: 2207 * 2208 * [*]domainname[:{servicename|portnumber|*}] 2209 * 2210 * or 2211 * 2212 * netaddr/maskbits[:{servicename|portnumber|*}] 2213 * 2214 * Returns -1 on error, 0 if the argument was valid. 2215 */ 2216static int 2217allowaddr(char *s) 2218{ 2219 char *cp1, *cp2; 2220 struct allowedpeer ap; 2221 struct servent *se; 2222 int masklen = -1; 2223 struct addrinfo hints, *res; 2224 struct in_addr *addrp, *maskp; 2225#ifdef INET6 2226 int i; 2227 u_int32_t *addr6p, *mask6p; 2228#endif 2229 char ip[NI_MAXHOST]; 2230 2231#ifdef INET6 2232 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2233#endif 2234 cp1 = s; 2235 if ((cp1 = strrchr(cp1, ':'))) { 2236 /* service/port provided */ 2237 *cp1++ = '\0'; 2238 if (strlen(cp1) == 1 && *cp1 == '*') 2239 /* any port allowed */ 2240 ap.port = 0; 2241 else if ((se = getservbyname(cp1, "udp"))) { 2242 ap.port = ntohs(se->s_port); 2243 } else { 2244 ap.port = strtol(cp1, &cp2, 0); 2245 if (*cp2 != '\0') 2246 return (-1); /* port not numeric */ 2247 } 2248 } else { 2249 if ((se = getservbyname("syslog", "udp"))) 2250 ap.port = ntohs(se->s_port); 2251 else 2252 /* sanity, should not happen */ 2253 ap.port = 514; 2254 } 2255 2256 if ((cp1 = strchr(s, '/')) != NULL && 2257 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2258 *cp1 = '\0'; 2259 if ((masklen = atoi(cp1 + 1)) < 0) 2260 return (-1); 2261 } 2262#ifdef INET6 2263 if (*s == '[') { 2264 cp2 = s + strlen(s) - 1; 2265 if (*cp2 == ']') { 2266 ++s; 2267 *cp2 = '\0'; 2268 } else { 2269 cp2 = NULL; 2270 } 2271 } else { 2272 cp2 = NULL; 2273 } 2274#endif 2275 memset(&hints, 0, sizeof(hints)); 2276 hints.ai_family = PF_UNSPEC; 2277 hints.ai_socktype = SOCK_DGRAM; 2278 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2279 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2280 ap.isnumeric = 1; 2281 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2282 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2283 ap.a_mask.ss_family = res->ai_family; 2284 if (res->ai_family == AF_INET) { 2285 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2286 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2287 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2288 if (masklen < 0) { 2289 /* use default netmask */ 2290 if (IN_CLASSA(ntohl(addrp->s_addr))) 2291 maskp->s_addr = htonl(IN_CLASSA_NET); 2292 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2293 maskp->s_addr = htonl(IN_CLASSB_NET); 2294 else 2295 maskp->s_addr = htonl(IN_CLASSC_NET); 2296 } else if (masklen <= 32) { 2297 /* convert masklen to netmask */ 2298 if (masklen == 0) 2299 maskp->s_addr = 0; 2300 else 2301 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2302 } else { 2303 freeaddrinfo(res); 2304 return (-1); 2305 } 2306 /* Lose any host bits in the network number. */ 2307 addrp->s_addr &= maskp->s_addr; 2308 } 2309#ifdef INET6 2310 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2311 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2312 if (masklen < 0) 2313 masklen = 128; 2314 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2315 /* convert masklen to netmask */ 2316 while (masklen > 0) { 2317 if (masklen < 32) { 2318 *mask6p = htonl(~(0xffffffff >> masklen)); 2319 break; 2320 } 2321 *mask6p++ = 0xffffffff; 2322 masklen -= 32; 2323 } 2324 /* Lose any host bits in the network number. */ 2325 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2326 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2327 for (i = 0; i < 4; i++) 2328 addr6p[i] &= mask6p[i]; 2329 } 2330#endif 2331 else { 2332 freeaddrinfo(res); 2333 return (-1); 2334 } 2335 freeaddrinfo(res); 2336 } else { 2337 /* arg `s' is domain name */ 2338 ap.isnumeric = 0; 2339 ap.a_name = s; 2340 if (cp1) 2341 *cp1 = '/'; 2342#ifdef INET6 2343 if (cp2) { 2344 *cp2 = ']'; 2345 --s; 2346 } 2347#endif 2348 } 2349 2350 if (Debug) { 2351 printf("allowaddr: rule %d: ", NumAllowed); 2352 if (ap.isnumeric) { 2353 printf("numeric, "); 2354 getnameinfo((struct sockaddr *)&ap.a_addr, 2355 ((struct sockaddr *)&ap.a_addr)->sa_len, 2356 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2357 printf("addr = %s, ", ip); 2358 getnameinfo((struct sockaddr *)&ap.a_mask, 2359 ((struct sockaddr *)&ap.a_mask)->sa_len, 2360 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2361 printf("mask = %s; ", ip); 2362 } else { 2363 printf("domainname = %s; ", ap.a_name); 2364 } 2365 printf("port = %d\n", ap.port); 2366 } 2367 2368 if ((AllowedPeers = realloc(AllowedPeers, 2369 ++NumAllowed * sizeof(struct allowedpeer))) 2370 == NULL) { 2371 logerror("realloc"); 2372 exit(1); 2373 } 2374 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2375 return (0); 2376} 2377 2378/* 2379 * Validate that the remote peer has permission to log to us. 2380 */ 2381static int 2382validate(struct sockaddr *sa, const char *hname) 2383{ 2384 int i; 2385 size_t l1, l2; 2386 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2387 struct allowedpeer *ap; 2388 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2389#ifdef INET6 2390 int j, reject; 2391 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2392#endif 2393 struct addrinfo hints, *res; 2394 u_short sport; 2395 2396 if (NumAllowed == 0) 2397 /* traditional behaviour, allow everything */ 2398 return (1); 2399 2400 (void)strlcpy(name, hname, sizeof(name)); 2401 memset(&hints, 0, sizeof(hints)); 2402 hints.ai_family = PF_UNSPEC; 2403 hints.ai_socktype = SOCK_DGRAM; 2404 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2405 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2406 freeaddrinfo(res); 2407 else if (strchr(name, '.') == NULL) { 2408 strlcat(name, ".", sizeof name); 2409 strlcat(name, LocalDomain, sizeof name); 2410 } 2411 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2412 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2413 return (0); /* for safety, should not occur */ 2414 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2415 ip, port, name); 2416 sport = atoi(port); 2417 2418 /* now, walk down the list */ 2419 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2420 if (ap->port != 0 && ap->port != sport) { 2421 dprintf("rejected in rule %d due to port mismatch.\n", i); 2422 continue; 2423 } 2424 2425 if (ap->isnumeric) { 2426 if (ap->a_addr.ss_family != sa->sa_family) { 2427 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2428 continue; 2429 } 2430 if (ap->a_addr.ss_family == AF_INET) { 2431 sin4 = (struct sockaddr_in *)sa; 2432 a4p = (struct sockaddr_in *)&ap->a_addr; 2433 m4p = (struct sockaddr_in *)&ap->a_mask; 2434 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2435 != a4p->sin_addr.s_addr) { 2436 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2437 continue; 2438 } 2439 } 2440#ifdef INET6 2441 else if (ap->a_addr.ss_family == AF_INET6) { 2442 sin6 = (struct sockaddr_in6 *)sa; 2443 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2444 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2445 if (a6p->sin6_scope_id != 0 && 2446 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2447 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2448 continue; 2449 } 2450 reject = 0; 2451 for (j = 0; j < 16; j += 4) { 2452 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2453 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2454 ++reject; 2455 break; 2456 } 2457 } 2458 if (reject) { 2459 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2460 continue; 2461 } 2462 } 2463#endif 2464 else 2465 continue; 2466 } else { 2467 cp = ap->a_name; 2468 l1 = strlen(name); 2469 if (*cp == '*') { 2470 /* allow wildmatch */ 2471 cp++; 2472 l2 = strlen(cp); 2473 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2474 dprintf("rejected in rule %d due to name mismatch.\n", i); 2475 continue; 2476 } 2477 } else { 2478 /* exact match */ 2479 l2 = strlen(cp); 2480 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2481 dprintf("rejected in rule %d due to name mismatch.\n", i); 2482 continue; 2483 } 2484 } 2485 } 2486 dprintf("accepted in rule %d.\n", i); 2487 return (1); /* hooray! */ 2488 } 2489 return (0); 2490} 2491 2492/* 2493 * Fairly similar to popen(3), but returns an open descriptor, as 2494 * opposed to a FILE *. 2495 */ 2496static int 2497p_open(const char *prog, pid_t *rpid) 2498{ 2499 int pfd[2], nulldesc; 2500 pid_t pid; 2501 sigset_t omask, mask; 2502 char *argv[4]; /* sh -c cmd NULL */ 2503 char errmsg[200]; 2504 2505 if (pipe(pfd) == -1) 2506 return (-1); 2507 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2508 /* we are royally screwed anyway */ 2509 return (-1); 2510 2511 sigemptyset(&mask); 2512 sigaddset(&mask, SIGALRM); 2513 sigaddset(&mask, SIGHUP); 2514 sigprocmask(SIG_BLOCK, &mask, &omask); 2515 switch ((pid = fork())) { 2516 case -1: 2517 sigprocmask(SIG_SETMASK, &omask, 0); 2518 close(nulldesc); 2519 return (-1); 2520 2521 case 0: 2522 argv[0] = strdup("sh"); 2523 argv[1] = strdup("-c"); 2524 argv[2] = strdup(prog); 2525 argv[3] = NULL; 2526 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2527 logerror("strdup"); 2528 exit(1); 2529 } 2530 2531 alarm(0); 2532 (void)setsid(); /* Avoid catching SIGHUPs. */ 2533 2534 /* 2535 * Throw away pending signals, and reset signal 2536 * behaviour to standard values. 2537 */ 2538 signal(SIGALRM, SIG_IGN); 2539 signal(SIGHUP, SIG_IGN); 2540 sigprocmask(SIG_SETMASK, &omask, 0); 2541 signal(SIGPIPE, SIG_DFL); 2542 signal(SIGQUIT, SIG_DFL); 2543 signal(SIGALRM, SIG_DFL); 2544 signal(SIGHUP, SIG_DFL); 2545 2546 dup2(pfd[0], STDIN_FILENO); 2547 dup2(nulldesc, STDOUT_FILENO); 2548 dup2(nulldesc, STDERR_FILENO); 2549 closefrom(3); 2550 2551 (void)execvp(_PATH_BSHELL, argv); 2552 _exit(255); 2553 } 2554 2555 sigprocmask(SIG_SETMASK, &omask, 0); 2556 close(nulldesc); 2557 close(pfd[0]); 2558 /* 2559 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2560 * supposed to get an EWOULDBLOCK on writev(2), which is 2561 * caught by the logic above anyway, which will in turn close 2562 * the pipe, and fork a new logging subprocess if necessary. 2563 * The stale subprocess will be killed some time later unless 2564 * it terminated itself due to closing its input pipe (so we 2565 * get rid of really dead puppies). 2566 */ 2567 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2568 /* This is bad. */ 2569 (void)snprintf(errmsg, sizeof errmsg, 2570 "Warning: cannot change pipe to PID %d to " 2571 "non-blocking behaviour.", 2572 (int)pid); 2573 logerror(errmsg); 2574 } 2575 *rpid = pid; 2576 return (pfd[1]); 2577} 2578 2579static void 2580deadq_enter(pid_t pid, const char *name) 2581{ 2582 dq_t p; 2583 int status; 2584 2585 /* 2586 * Be paranoid, if we can't signal the process, don't enter it 2587 * into the dead queue (perhaps it's already dead). If possible, 2588 * we try to fetch and log the child's status. 2589 */ 2590 if (kill(pid, 0) != 0) { 2591 if (waitpid(pid, &status, WNOHANG) > 0) 2592 log_deadchild(pid, status, name); 2593 return; 2594 } 2595 2596 p = malloc(sizeof(struct deadq_entry)); 2597 if (p == NULL) { 2598 logerror("malloc"); 2599 exit(1); 2600 } 2601 2602 p->dq_pid = pid; 2603 p->dq_timeout = DQ_TIMO_INIT; 2604 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2605} 2606 2607static int 2608deadq_remove(pid_t pid) 2609{ 2610 dq_t q; 2611 2612 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2613 if (q->dq_pid == pid) { 2614 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2615 free(q); 2616 return (1); 2617 } 2618 } 2619 2620 return (0); 2621} 2622 2623static void 2624log_deadchild(pid_t pid, int status, const char *name) 2625{ 2626 int code; 2627 char buf[256]; 2628 const char *reason; 2629 2630 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2631 if (WIFSIGNALED(status)) { 2632 reason = "due to signal"; 2633 code = WTERMSIG(status); 2634 } else { 2635 reason = "with status"; 2636 code = WEXITSTATUS(status); 2637 if (code == 0) 2638 return; 2639 } 2640 (void)snprintf(buf, sizeof buf, 2641 "Logging subprocess %d (%s) exited %s %d.", 2642 pid, name, reason, code); 2643 logerror(buf); 2644} 2645 2646static int * 2647socksetup(int af, char *bindhostname) 2648{ 2649 struct addrinfo hints, *res, *r; 2650 const char *bindservice; 2651 char *cp; 2652 int error, maxs, *s, *socks; 2653 2654 /* 2655 * We have to handle this case for backwards compatibility: 2656 * If there are two (or more) colons but no '[' and ']', 2657 * assume this is an inet6 address without a service. 2658 */ 2659 bindservice = "syslog"; 2660 if (bindhostname != NULL) { 2661#ifdef INET6 2662 if (*bindhostname == '[' && 2663 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2664 ++bindhostname; 2665 *cp = '\0'; 2666 if (cp[1] == ':' && cp[2] != '\0') 2667 bindservice = cp + 2; 2668 } else { 2669#endif 2670 cp = strchr(bindhostname, ':'); 2671 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2672 *cp = '\0'; 2673 if (cp[1] != '\0') 2674 bindservice = cp + 1; 2675 if (cp == bindhostname) 2676 bindhostname = NULL; 2677 } 2678#ifdef INET6 2679 } 2680#endif 2681 } 2682 2683 memset(&hints, 0, sizeof(hints)); 2684 hints.ai_flags = AI_PASSIVE; 2685 hints.ai_family = af; 2686 hints.ai_socktype = SOCK_DGRAM; 2687 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2688 if (error) { 2689 logerror(gai_strerror(error)); 2690 errno = 0; 2691 die(0); 2692 } 2693 2694 /* Count max number of sockets we may open */ 2695 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2696 socks = malloc((maxs+1) * sizeof(int)); 2697 if (socks == NULL) { 2698 logerror("couldn't allocate memory for sockets"); 2699 die(0); 2700 } 2701 2702 *socks = 0; /* num of sockets counter at start of array */ 2703 s = socks + 1; 2704 for (r = res; r; r = r->ai_next) { 2705 int on = 1; 2706 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2707 if (*s < 0) { 2708 logerror("socket"); 2709 continue; 2710 } 2711#ifdef INET6 2712 if (r->ai_family == AF_INET6) { 2713 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2714 (char *)&on, sizeof (on)) < 0) { 2715 logerror("setsockopt"); 2716 close(*s); 2717 continue; 2718 } 2719 } 2720#endif 2721 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2722 (char *)&on, sizeof (on)) < 0) { 2723 logerror("setsockopt"); 2724 close(*s); 2725 continue; 2726 } 2727 /* 2728 * RFC 3164 recommends that client side message 2729 * should come from the privileged syslogd port. 2730 * 2731 * If the system administrator choose not to obey 2732 * this, we can skip the bind() step so that the 2733 * system will choose a port for us. 2734 */ 2735 if (!NoBind) { 2736 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2737 logerror("bind"); 2738 close(*s); 2739 continue; 2740 } 2741 2742 if (!SecureMode) 2743 increase_rcvbuf(*s); 2744 } 2745 2746 (*socks)++; 2747 s++; 2748 } 2749 2750 if (*socks == 0) { 2751 free(socks); 2752 if (Debug) 2753 return (NULL); 2754 else 2755 die(0); 2756 } 2757 if (res) 2758 freeaddrinfo(res); 2759 2760 return (socks); 2761} 2762 2763static void 2764increase_rcvbuf(int fd) 2765{ 2766 socklen_t len, slen; 2767 2768 slen = sizeof(len); 2769 2770 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2771 if (len < RCVBUF_MINSIZE) { 2772 len = RCVBUF_MINSIZE; 2773 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2774 } 2775 } 2776} 2777