syslogd.c revision 333356
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/11/usr.sbin/syslogd/syslogd.c 333356 2018-05-08 05:10:06Z delphij $"); 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 <dirent.h> 101#include <err.h> 102#include <errno.h> 103#include <fcntl.h> 104#include <libutil.h> 105#include <limits.h> 106#include <paths.h> 107#include <signal.h> 108#include <stdio.h> 109#include <stdlib.h> 110#include <string.h> 111#include <sysexits.h> 112#include <unistd.h> 113#include <utmpx.h> 114 115#include "pathnames.h" 116#include "ttymsg.h" 117 118#define SYSLOG_NAMES 119#include <sys/syslog.h> 120 121const char *ConfFile = _PATH_LOGCONF; 122const char *PidFile = _PATH_LOGPID; 123const char ctty[] = _PATH_CONSOLE; 124static const char include_str[] = "include"; 125static const char include_ext[] = ".conf"; 126 127#define dprintf if (Debug) printf 128 129#define MAXUNAMES 20 /* maximum number of user names */ 130 131/* 132 * List of hosts for binding. 133 */ 134static STAILQ_HEAD(, host) hqueue; 135struct host { 136 char *name; 137 STAILQ_ENTRY(host) next; 138}; 139 140/* 141 * Unix sockets. 142 * We have two default sockets, one with 666 permissions, 143 * and one for privileged programs. 144 */ 145struct funix { 146 int s; 147 const char *name; 148 mode_t mode; 149 STAILQ_ENTRY(funix) next; 150}; 151struct funix funix_secure = { -1, _PATH_LOG_PRIV, S_IRUSR | S_IWUSR, 152 { NULL } }; 153struct funix funix_default = { -1, _PATH_LOG, DEFFILEMODE, 154 { &funix_secure } }; 155 156STAILQ_HEAD(, funix) funixes = { &funix_default, 157 &(funix_secure.next.stqe_next) }; 158 159/* 160 * Flags to logmsg(). 161 */ 162 163#define IGN_CONS 0x001 /* don't print on console */ 164#define SYNC_FILE 0x002 /* do fsync on file after printing */ 165#define ADDDATE 0x004 /* add a date to the message */ 166#define MARK 0x008 /* this message is a mark */ 167#define ISKERNEL 0x010 /* kernel generated message */ 168 169/* 170 * This structure represents the files that will have log 171 * copies printed. 172 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 173 * or if f_type is F_PIPE and f_pid > 0. 174 */ 175 176struct filed { 177 struct filed *f_next; /* next in linked list */ 178 short f_type; /* entry type, see below */ 179 short f_file; /* file descriptor */ 180 time_t f_time; /* time this was last written */ 181 char *f_host; /* host from which to recd. */ 182 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 183 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 184#define PRI_LT 0x1 185#define PRI_EQ 0x2 186#define PRI_GT 0x4 187 char *f_program; /* program this applies to */ 188 union { 189 char f_uname[MAXUNAMES][MAXLOGNAME]; 190 struct { 191 char f_hname[MAXHOSTNAMELEN]; 192 struct addrinfo *f_addr; 193 194 } f_forw; /* forwarding address */ 195 char f_fname[MAXPATHLEN]; 196 struct { 197 char f_pname[MAXPATHLEN]; 198 pid_t f_pid; 199 } f_pipe; 200 } f_un; 201 char f_prevline[MAXSVLINE]; /* last message logged */ 202 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 203 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 204 int f_prevpri; /* pri of f_prevline */ 205 int f_prevlen; /* length of f_prevline */ 206 int f_prevcount; /* repetition cnt of prevline */ 207 u_int f_repeatcount; /* number of "repeated" msgs */ 208 int f_flags; /* file-specific flags */ 209#define FFLAG_SYNC 0x01 210#define FFLAG_NEEDSYNC 0x02 211}; 212 213/* 214 * Queue of about-to-be dead processes we should watch out for. 215 */ 216 217TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 218struct stailhead *deadq_headp; 219 220struct deadq_entry { 221 pid_t dq_pid; 222 int dq_timeout; 223 TAILQ_ENTRY(deadq_entry) dq_entries; 224}; 225 226/* 227 * The timeout to apply to processes waiting on the dead queue. Unit 228 * of measure is `mark intervals', i.e. 20 minutes by default. 229 * Processes on the dead queue will be terminated after that time. 230 */ 231 232#define DQ_TIMO_INIT 2 233 234typedef struct deadq_entry *dq_t; 235 236 237/* 238 * Struct to hold records of network addresses that are allowed to log 239 * to us. 240 */ 241struct allowedpeer { 242 int isnumeric; 243 u_short port; 244 union { 245 struct { 246 struct sockaddr_storage addr; 247 struct sockaddr_storage mask; 248 } numeric; 249 char *name; 250 } u; 251#define a_addr u.numeric.addr 252#define a_mask u.numeric.mask 253#define a_name u.name 254}; 255 256 257/* 258 * Intervals at which we flush out "message repeated" messages, 259 * in seconds after previous message is logged. After each flush, 260 * we move to the next interval until we reach the largest. 261 */ 262int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 263#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 264#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 265#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 266 (f)->f_repeatcount = MAXREPEAT; \ 267 } 268 269/* values for f_type */ 270#define F_UNUSED 0 /* unused entry */ 271#define F_FILE 1 /* regular file */ 272#define F_TTY 2 /* terminal */ 273#define F_CONSOLE 3 /* console terminal */ 274#define F_FORW 4 /* remote machine */ 275#define F_USERS 5 /* list of users */ 276#define F_WALL 6 /* everyone logged on */ 277#define F_PIPE 7 /* pipe to program */ 278 279const char *TypeNames[8] = { 280 "UNUSED", "FILE", "TTY", "CONSOLE", 281 "FORW", "USERS", "WALL", "PIPE" 282}; 283 284static struct filed *Files; /* Log files that we write to */ 285static struct filed consfile; /* Console */ 286 287static int Debug; /* debug flag */ 288static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 289static int resolve = 1; /* resolve hostname */ 290static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 291static const char *LocalDomain; /* our local domain name */ 292static int *finet; /* Internet datagram sockets */ 293static int fklog = -1; /* /dev/klog */ 294static int Initialized; /* set when we have initialized ourselves */ 295static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 296static int MarkSeq; /* mark sequence number */ 297static int NoBind; /* don't bind() as suggested by RFC 3164 */ 298static int SecureMode; /* when true, receive only unix domain socks */ 299#ifdef INET6 300static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 301#else 302static int family = PF_INET; /* protocol family (IPv4 only) */ 303#endif 304static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 305static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 306static int use_bootfile; /* log entire bootfile for every kern msg */ 307static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 308static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 309 310static char bootfile[MAXLINE+1]; /* booted kernel file */ 311 312struct allowedpeer *AllowedPeers; /* List of allowed peers */ 313static int NumAllowed; /* Number of entries in AllowedPeers */ 314static int RemoteAddDate; /* Always set the date on remote messages */ 315 316static int UniquePriority; /* Only log specified priority? */ 317static int LogFacPri; /* Put facility and priority in log message: */ 318 /* 0=no, 1=numeric, 2=names */ 319static int KeepKernFac; /* Keep remotely logged kernel facility */ 320static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 321static struct pidfh *pfh; 322 323volatile sig_atomic_t MarkSet, WantDie; 324 325static int allowaddr(char *); 326static void cfline(const char *, struct filed *, 327 const char *, const char *); 328static const char *cvthname(struct sockaddr *); 329static void deadq_enter(pid_t, const char *); 330static int deadq_remove(pid_t); 331static int decode(const char *, const CODE *); 332static void die(int) __dead2; 333static void dodie(int); 334static void dofsync(void); 335static void domark(int); 336static void fprintlog(struct filed *, int, const char *); 337static int *socksetup(int, char *); 338static void init(int); 339static void logerror(const char *); 340static void logmsg(int, const char *, const char *, int); 341static void log_deadchild(pid_t, int, const char *); 342static void markit(void); 343static int skip_message(const char *, const char *, int); 344static void printline(const char *, char *, int); 345static void printsys(char *); 346static int p_open(const char *, pid_t *); 347static void readklog(void); 348static void reapchild(int); 349static const char *ttymsg_check(struct iovec *, int, char *, int); 350static void usage(void); 351static int validate(struct sockaddr *, const char *); 352static void unmapped(struct sockaddr *); 353static void wallmsg(struct filed *, struct iovec *, const int iovlen); 354static int waitdaemon(int, int, int); 355static void timedout(int); 356static void increase_rcvbuf(int); 357 358static void 359close_filed(struct filed *f) 360{ 361 362 if (f == NULL || f->f_file == -1) 363 return; 364 365 switch (f->f_type) { 366 case F_FORW: 367 if (f->f_un.f_forw.f_addr) { 368 freeaddrinfo(f->f_un.f_forw.f_addr); 369 f->f_un.f_forw.f_addr = NULL; 370 } 371 /*FALLTHROUGH*/ 372 373 case F_FILE: 374 case F_TTY: 375 case F_CONSOLE: 376 f->f_type = F_UNUSED; 377 break; 378 case F_PIPE: 379 f->f_un.f_pipe.f_pid = 0; 380 break; 381 } 382 (void)close(f->f_file); 383 f->f_file = -1; 384} 385 386int 387main(int argc, char *argv[]) 388{ 389 int ch, i, fdsrmax = 0, l; 390 struct sockaddr_un sunx, fromunix; 391 struct sockaddr_storage frominet; 392 fd_set *fdsr = NULL; 393 char line[MAXLINE + 1]; 394 const char *hname; 395 struct timeval tv, *tvp; 396 struct sigaction sact; 397 struct host *host; 398 struct funix *fx, *fx1; 399 sigset_t mask; 400 pid_t ppid = 1, spid; 401 socklen_t len; 402 403 if (madvise(NULL, 0, MADV_PROTECT) != 0) 404 dprintf("madvise() failed: %s\n", strerror(errno)); 405 406 STAILQ_INIT(&hqueue); 407 408 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 409 != -1) 410 switch (ch) { 411 case '4': 412 family = PF_INET; 413 break; 414#ifdef INET6 415 case '6': 416 family = PF_INET6; 417 break; 418#endif 419 case '8': 420 mask_C1 = 0; 421 break; 422 case 'A': 423 send_to_all++; 424 break; 425 case 'a': /* allow specific network addresses only */ 426 if (allowaddr(optarg) == -1) 427 usage(); 428 break; 429 case 'b': 430 { 431 if ((host = malloc(sizeof(struct host))) == NULL) 432 err(1, "malloc failed"); 433 host->name = optarg; 434 STAILQ_INSERT_TAIL(&hqueue, host, next); 435 break; 436 } 437 case 'c': 438 no_compress++; 439 break; 440 case 'C': 441 logflags |= O_CREAT; 442 break; 443 case 'd': /* debug */ 444 Debug++; 445 break; 446 case 'f': /* configuration file */ 447 ConfFile = optarg; 448 break; 449 case 'F': /* run in foreground instead of daemon */ 450 Foreground++; 451 break; 452 case 'k': /* keep remote kern fac */ 453 KeepKernFac = 1; 454 break; 455 case 'l': 456 { 457 long perml; 458 mode_t mode; 459 char *name, *ep; 460 461 if (optarg[0] == '/') { 462 mode = DEFFILEMODE; 463 name = optarg; 464 } else if ((name = strchr(optarg, ':')) != NULL) { 465 *name++ = '\0'; 466 if (name[0] != '/') 467 errx(1, "socket name must be absolute " 468 "path"); 469 if (isdigit(*optarg)) { 470 perml = strtol(optarg, &ep, 8); 471 if (*ep || perml < 0 || 472 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 473 errx(1, "invalid mode %s, exiting", 474 optarg); 475 mode = (mode_t )perml; 476 } else 477 errx(1, "invalid mode %s, exiting", 478 optarg); 479 } else /* doesn't begin with '/', and no ':' */ 480 errx(1, "can't parse path %s", optarg); 481 482 if (strlen(name) >= sizeof(sunx.sun_path)) 483 errx(1, "%s path too long, exiting", name); 484 if ((fx = malloc(sizeof(struct funix))) == NULL) 485 err(1, "malloc failed"); 486 fx->s = -1; 487 fx->name = name; 488 fx->mode = mode; 489 STAILQ_INSERT_TAIL(&funixes, fx, next); 490 break; 491 } 492 case 'm': /* mark interval */ 493 MarkInterval = atoi(optarg) * 60; 494 break; 495 case 'N': 496 NoBind = 1; 497 SecureMode = 1; 498 break; 499 case 'n': 500 resolve = 0; 501 break; 502 case 'o': 503 use_bootfile = 1; 504 break; 505 case 'p': /* path */ 506 if (strlen(optarg) >= sizeof(sunx.sun_path)) 507 errx(1, "%s path too long, exiting", optarg); 508 funix_default.name = optarg; 509 break; 510 case 'P': /* path for alt. PID */ 511 PidFile = optarg; 512 break; 513 case 's': /* no network mode */ 514 SecureMode++; 515 break; 516 case 'S': /* path for privileged originator */ 517 if (strlen(optarg) >= sizeof(sunx.sun_path)) 518 errx(1, "%s path too long, exiting", optarg); 519 funix_secure.name = optarg; 520 break; 521 case 'T': 522 RemoteAddDate = 1; 523 break; 524 case 'u': /* only log specified priority */ 525 UniquePriority++; 526 break; 527 case 'v': /* log facility and priority */ 528 LogFacPri++; 529 break; 530 default: 531 usage(); 532 } 533 if ((argc -= optind) != 0) 534 usage(); 535 536 pfh = pidfile_open(PidFile, 0600, &spid); 537 if (pfh == NULL) { 538 if (errno == EEXIST) 539 errx(1, "syslogd already running, pid: %d", spid); 540 warn("cannot open pid file"); 541 } 542 543 if ((!Foreground) && (!Debug)) { 544 ppid = waitdaemon(0, 0, 30); 545 if (ppid < 0) { 546 warn("could not become daemon"); 547 pidfile_remove(pfh); 548 exit(1); 549 } 550 } else if (Debug) { 551 setlinebuf(stdout); 552 } 553 554 if (NumAllowed) 555 endservent(); 556 557 consfile.f_type = F_CONSOLE; 558 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 559 sizeof(consfile.f_un.f_fname)); 560 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 561 (void)signal(SIGTERM, dodie); 562 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 563 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 564 /* 565 * We don't want the SIGCHLD and SIGHUP handlers to interfere 566 * with each other; they are likely candidates for being called 567 * simultaneously (SIGHUP closes pipe descriptor, process dies, 568 * SIGCHLD happens). 569 */ 570 sigemptyset(&mask); 571 sigaddset(&mask, SIGHUP); 572 sact.sa_handler = reapchild; 573 sact.sa_mask = mask; 574 sact.sa_flags = SA_RESTART; 575 (void)sigaction(SIGCHLD, &sact, NULL); 576 (void)signal(SIGALRM, domark); 577 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 578 (void)alarm(TIMERINTVL); 579 580 TAILQ_INIT(&deadq_head); 581 582#ifndef SUN_LEN 583#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 584#endif 585 STAILQ_FOREACH_SAFE(fx, &funixes, next, fx1) { 586 (void)unlink(fx->name); 587 memset(&sunx, 0, sizeof(sunx)); 588 sunx.sun_family = AF_LOCAL; 589 (void)strlcpy(sunx.sun_path, fx->name, sizeof(sunx.sun_path)); 590 fx->s = socket(PF_LOCAL, SOCK_DGRAM, 0); 591 if (fx->s < 0 || 592 bind(fx->s, (struct sockaddr *)&sunx, SUN_LEN(&sunx)) < 0 || 593 chmod(fx->name, fx->mode) < 0) { 594 (void)snprintf(line, sizeof line, 595 "cannot create %s", fx->name); 596 logerror(line); 597 dprintf("cannot create %s (%d)\n", fx->name, errno); 598 if (fx == &funix_default || fx == &funix_secure) 599 die(0); 600 else { 601 STAILQ_REMOVE(&funixes, fx, funix, next); 602 continue; 603 } 604 } 605 increase_rcvbuf(fx->s); 606 } 607 if (SecureMode <= 1) { 608 if (STAILQ_EMPTY(&hqueue)) 609 finet = socksetup(family, NULL); 610 STAILQ_FOREACH(host, &hqueue, next) { 611 int *finet0, total; 612 finet0 = socksetup(family, host->name); 613 if (finet0 && !finet) { 614 finet = finet0; 615 } else if (finet0 && finet) { 616 total = *finet0 + *finet + 1; 617 finet = realloc(finet, total * sizeof(int)); 618 if (finet == NULL) 619 err(1, "realloc failed"); 620 for (i = 1; i <= *finet0; i++) { 621 finet[(*finet)+i] = finet0[i]; 622 } 623 *finet = total - 1; 624 free(finet0); 625 } 626 } 627 } 628 629 if (finet) { 630 if (SecureMode) { 631 for (i = 0; i < *finet; i++) { 632 if (shutdown(finet[i+1], SHUT_RD) < 0 && 633 errno != ENOTCONN) { 634 logerror("shutdown"); 635 if (!Debug) 636 die(0); 637 } 638 } 639 } else { 640 dprintf("listening on inet and/or inet6 socket\n"); 641 } 642 dprintf("sending on inet and/or inet6 socket\n"); 643 } 644 645 if ((fklog = open(_PATH_KLOG, O_RDONLY|O_NONBLOCK, 0)) < 0) 646 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 647 648 /* tuck my process id away */ 649 pidfile_write(pfh); 650 651 dprintf("off & running....\n"); 652 653 init(0); 654 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 655 sigemptyset(&mask); 656 sigaddset(&mask, SIGCHLD); 657 sact.sa_handler = init; 658 sact.sa_mask = mask; 659 sact.sa_flags = SA_RESTART; 660 (void)sigaction(SIGHUP, &sact, NULL); 661 662 tvp = &tv; 663 tv.tv_sec = tv.tv_usec = 0; 664 665 if (fklog != -1 && fklog > fdsrmax) 666 fdsrmax = fklog; 667 if (finet && !SecureMode) { 668 for (i = 0; i < *finet; i++) { 669 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 670 fdsrmax = finet[i+1]; 671 } 672 } 673 STAILQ_FOREACH(fx, &funixes, next) 674 if (fx->s > fdsrmax) 675 fdsrmax = fx->s; 676 677 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 678 sizeof(*fdsr)); 679 if (fdsr == NULL) 680 errx(1, "calloc fd_set"); 681 682 for (;;) { 683 if (MarkSet) 684 markit(); 685 if (WantDie) 686 die(WantDie); 687 688 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 689 sizeof(*fdsr)); 690 691 if (fklog != -1) 692 FD_SET(fklog, fdsr); 693 if (finet && !SecureMode) { 694 for (i = 0; i < *finet; i++) { 695 if (finet[i+1] != -1) 696 FD_SET(finet[i+1], fdsr); 697 } 698 } 699 STAILQ_FOREACH(fx, &funixes, next) 700 FD_SET(fx->s, fdsr); 701 702 i = select(fdsrmax+1, fdsr, NULL, NULL, 703 needdofsync ? &tv : tvp); 704 switch (i) { 705 case 0: 706 dofsync(); 707 needdofsync = 0; 708 if (tvp) { 709 tvp = NULL; 710 if (ppid != 1) 711 kill(ppid, SIGALRM); 712 } 713 continue; 714 case -1: 715 if (errno != EINTR) 716 logerror("select"); 717 continue; 718 } 719 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 720 readklog(); 721 if (finet && !SecureMode) { 722 for (i = 0; i < *finet; i++) { 723 if (FD_ISSET(finet[i+1], fdsr)) { 724 len = sizeof(frominet); 725 l = recvfrom(finet[i+1], line, MAXLINE, 726 0, (struct sockaddr *)&frominet, 727 &len); 728 if (l > 0) { 729 line[l] = '\0'; 730 hname = cvthname((struct sockaddr *)&frominet); 731 unmapped((struct sockaddr *)&frominet); 732 if (validate((struct sockaddr *)&frominet, hname)) 733 printline(hname, line, RemoteAddDate ? ADDDATE : 0); 734 } else if (l < 0 && errno != EINTR) 735 logerror("recvfrom inet"); 736 } 737 } 738 } 739 STAILQ_FOREACH(fx, &funixes, next) { 740 if (FD_ISSET(fx->s, fdsr)) { 741 len = sizeof(fromunix); 742 l = recvfrom(fx->s, line, MAXLINE, 0, 743 (struct sockaddr *)&fromunix, &len); 744 if (l > 0) { 745 line[l] = '\0'; 746 printline(LocalHostName, line, 0); 747 } else if (l < 0 && errno != EINTR) 748 logerror("recvfrom unix"); 749 } 750 } 751 } 752 if (fdsr) 753 free(fdsr); 754} 755 756static void 757unmapped(struct sockaddr *sa) 758{ 759 struct sockaddr_in6 *sin6; 760 struct sockaddr_in sin4; 761 762 if (sa->sa_family != AF_INET6) 763 return; 764 if (sa->sa_len != sizeof(struct sockaddr_in6) || 765 sizeof(sin4) > sa->sa_len) 766 return; 767 sin6 = (struct sockaddr_in6 *)sa; 768 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 769 return; 770 771 memset(&sin4, 0, sizeof(sin4)); 772 sin4.sin_family = AF_INET; 773 sin4.sin_len = sizeof(struct sockaddr_in); 774 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 775 sizeof(sin4.sin_addr)); 776 sin4.sin_port = sin6->sin6_port; 777 778 memcpy(sa, &sin4, sin4.sin_len); 779} 780 781static void 782usage(void) 783{ 784 785 fprintf(stderr, "%s\n%s\n%s\n%s\n", 786 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 787 " [-b bind_address] [-f config_file]", 788 " [-l [mode:]path] [-m mark_interval]", 789 " [-P pid_file] [-p log_socket]"); 790 exit(1); 791} 792 793/* 794 * Take a raw input line, decode the message, and print the message 795 * on the appropriate log files. 796 */ 797static void 798printline(const char *hname, char *msg, int flags) 799{ 800 char *p, *q; 801 long n; 802 int c, pri; 803 char line[MAXLINE + 1]; 804 805 /* test for special codes */ 806 p = msg; 807 pri = DEFUPRI; 808 if (*p == '<') { 809 errno = 0; 810 n = strtol(p + 1, &q, 10); 811 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 812 p = q + 1; 813 pri = n; 814 } 815 } 816 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 817 pri = DEFUPRI; 818 819 /* 820 * Don't allow users to log kernel messages. 821 * NOTE: since LOG_KERN == 0 this will also match 822 * messages with no facility specified. 823 */ 824 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 825 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 826 827 q = line; 828 829 while ((c = (unsigned char)*p++) != '\0' && 830 q < &line[sizeof(line) - 4]) { 831 if (mask_C1 && (c & 0x80) && c < 0xA0) { 832 c &= 0x7F; 833 *q++ = 'M'; 834 *q++ = '-'; 835 } 836 if (isascii(c) && iscntrl(c)) { 837 if (c == '\n') { 838 *q++ = ' '; 839 } else if (c == '\t') { 840 *q++ = '\t'; 841 } else { 842 *q++ = '^'; 843 *q++ = c ^ 0100; 844 } 845 } else { 846 *q++ = c; 847 } 848 } 849 *q = '\0'; 850 851 logmsg(pri, line, hname, flags); 852} 853 854/* 855 * Read /dev/klog while data are available, split into lines. 856 */ 857static void 858readklog(void) 859{ 860 char *p, *q, line[MAXLINE + 1]; 861 int len, i; 862 863 len = 0; 864 for (;;) { 865 i = read(fklog, line + len, MAXLINE - 1 - len); 866 if (i > 0) { 867 line[i + len] = '\0'; 868 } else { 869 if (i < 0 && errno != EINTR && errno != EAGAIN) { 870 logerror("klog"); 871 fklog = -1; 872 } 873 break; 874 } 875 876 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 877 *q = '\0'; 878 printsys(p); 879 } 880 len = strlen(p); 881 if (len >= MAXLINE - 1) { 882 printsys(p); 883 len = 0; 884 } 885 if (len > 0) 886 memmove(line, p, len + 1); 887 } 888 if (len > 0) 889 printsys(line); 890} 891 892/* 893 * Take a raw input line from /dev/klog, format similar to syslog(). 894 */ 895static void 896printsys(char *msg) 897{ 898 char *p, *q; 899 long n; 900 int flags, isprintf, pri; 901 902 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 903 p = msg; 904 pri = DEFSPRI; 905 isprintf = 1; 906 if (*p == '<') { 907 errno = 0; 908 n = strtol(p + 1, &q, 10); 909 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 910 p = q + 1; 911 pri = n; 912 isprintf = 0; 913 } 914 } 915 /* 916 * Kernel printf's and LOG_CONSOLE messages have been displayed 917 * on the console already. 918 */ 919 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 920 flags |= IGN_CONS; 921 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 922 pri = DEFSPRI; 923 logmsg(pri, p, LocalHostName, flags); 924} 925 926static time_t now; 927 928/* 929 * Match a program or host name against a specification. 930 * Return a non-0 value if the message must be ignored 931 * based on the specification. 932 */ 933static int 934skip_message(const char *name, const char *spec, int checkcase) 935{ 936 const char *s; 937 char prev, next; 938 int exclude = 0; 939 /* Behaviour on explicit match */ 940 941 if (spec == NULL) 942 return 0; 943 switch (*spec) { 944 case '-': 945 exclude = 1; 946 /*FALLTHROUGH*/ 947 case '+': 948 spec++; 949 break; 950 default: 951 break; 952 } 953 if (checkcase) 954 s = strstr (spec, name); 955 else 956 s = strcasestr (spec, name); 957 958 if (s != NULL) { 959 prev = (s == spec ? ',' : *(s - 1)); 960 next = *(s + strlen (name)); 961 962 if (prev == ',' && (next == '\0' || next == ',')) 963 /* Explicit match: skip iff the spec is an 964 exclusive one. */ 965 return exclude; 966 } 967 968 /* No explicit match for this name: skip the message iff 969 the spec is an inclusive one. */ 970 return !exclude; 971} 972 973/* 974 * Log a message to the appropriate log files, users, etc. based on 975 * the priority. 976 */ 977static void 978logmsg(int pri, const char *msg, const char *from, int flags) 979{ 980 struct filed *f; 981 int i, fac, msglen, omask, prilev; 982 const char *timestamp; 983 char prog[NAME_MAX+1]; 984 char buf[MAXLINE+1]; 985 986 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 987 pri, flags, from, msg); 988 989 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 990 991 /* 992 * Check to see if msg looks non-standard. 993 */ 994 msglen = strlen(msg); 995 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 996 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 997 flags |= ADDDATE; 998 999 (void)time(&now); 1000 if (flags & ADDDATE) { 1001 timestamp = ctime(&now) + 4; 1002 } else { 1003 timestamp = msg; 1004 msg += MAXDATELEN; 1005 msglen -= MAXDATELEN; 1006 } 1007 1008 /* skip leading blanks */ 1009 while (isspace(*msg)) { 1010 msg++; 1011 msglen--; 1012 } 1013 1014 /* extract facility and priority level */ 1015 if (flags & MARK) 1016 fac = LOG_NFACILITIES; 1017 else 1018 fac = LOG_FAC(pri); 1019 1020 /* Check maximum facility number. */ 1021 if (fac > LOG_NFACILITIES) { 1022 (void)sigsetmask(omask); 1023 return; 1024 } 1025 1026 prilev = LOG_PRI(pri); 1027 1028 /* extract program name */ 1029 for (i = 0; i < NAME_MAX; i++) { 1030 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1031 msg[i] == '/' || isspace(msg[i])) 1032 break; 1033 prog[i] = msg[i]; 1034 } 1035 prog[i] = 0; 1036 1037 /* add kernel prefix for kernel messages */ 1038 if (flags & ISKERNEL) { 1039 snprintf(buf, sizeof(buf), "%s: %s", 1040 use_bootfile ? bootfile : "kernel", msg); 1041 msg = buf; 1042 msglen = strlen(buf); 1043 } 1044 1045 /* log the message to the particular outputs */ 1046 if (!Initialized) { 1047 f = &consfile; 1048 /* 1049 * Open in non-blocking mode to avoid hangs during open 1050 * and close(waiting for the port to drain). 1051 */ 1052 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1053 1054 if (f->f_file >= 0) { 1055 (void)strlcpy(f->f_lasttime, timestamp, 1056 sizeof(f->f_lasttime)); 1057 fprintlog(f, flags, msg); 1058 close(f->f_file); 1059 f->f_file = -1; 1060 } 1061 (void)sigsetmask(omask); 1062 return; 1063 } 1064 for (f = Files; f; f = f->f_next) { 1065 /* skip messages that are incorrect priority */ 1066 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1067 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1068 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1069 ) 1070 || f->f_pmask[fac] == INTERNAL_NOPRI) 1071 continue; 1072 1073 /* skip messages with the incorrect hostname */ 1074 if (skip_message(from, f->f_host, 0)) 1075 continue; 1076 1077 /* skip messages with the incorrect program name */ 1078 if (skip_message(prog, f->f_program, 1)) 1079 continue; 1080 1081 /* skip message to console if it has already been printed */ 1082 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1083 continue; 1084 1085 /* don't output marks to recently written files */ 1086 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1087 continue; 1088 1089 /* 1090 * suppress duplicate lines to this file 1091 */ 1092 if (no_compress - (f->f_type != F_PIPE) < 1 && 1093 (flags & MARK) == 0 && msglen == f->f_prevlen && 1094 !strcmp(msg, f->f_prevline) && 1095 !strcasecmp(from, f->f_prevhost)) { 1096 (void)strlcpy(f->f_lasttime, timestamp, 1097 sizeof(f->f_lasttime)); 1098 f->f_prevcount++; 1099 dprintf("msg repeated %d times, %ld sec of %d\n", 1100 f->f_prevcount, (long)(now - f->f_time), 1101 repeatinterval[f->f_repeatcount]); 1102 /* 1103 * If domark would have logged this by now, 1104 * flush it now (so we don't hold isolated messages), 1105 * but back off so we'll flush less often 1106 * in the future. 1107 */ 1108 if (now > REPEATTIME(f)) { 1109 fprintlog(f, flags, (char *)NULL); 1110 BACKOFF(f); 1111 } 1112 } else { 1113 /* new line, save it */ 1114 if (f->f_prevcount) 1115 fprintlog(f, 0, (char *)NULL); 1116 f->f_repeatcount = 0; 1117 f->f_prevpri = pri; 1118 (void)strlcpy(f->f_lasttime, timestamp, 1119 sizeof(f->f_lasttime)); 1120 (void)strlcpy(f->f_prevhost, from, 1121 sizeof(f->f_prevhost)); 1122 if (msglen < MAXSVLINE) { 1123 f->f_prevlen = msglen; 1124 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1125 fprintlog(f, flags, (char *)NULL); 1126 } else { 1127 f->f_prevline[0] = 0; 1128 f->f_prevlen = 0; 1129 fprintlog(f, flags, msg); 1130 } 1131 } 1132 } 1133 (void)sigsetmask(omask); 1134} 1135 1136static void 1137dofsync(void) 1138{ 1139 struct filed *f; 1140 1141 for (f = Files; f; f = f->f_next) { 1142 if ((f->f_type == F_FILE) && 1143 (f->f_flags & FFLAG_NEEDSYNC)) { 1144 f->f_flags &= ~FFLAG_NEEDSYNC; 1145 (void)fsync(f->f_file); 1146 } 1147 } 1148} 1149 1150#define IOV_SIZE 7 1151static void 1152fprintlog(struct filed *f, int flags, const char *msg) 1153{ 1154 struct iovec iov[IOV_SIZE]; 1155 struct iovec *v; 1156 struct addrinfo *r; 1157 int i, l, lsent = 0; 1158 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1159 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1160 const char *msgret; 1161 1162 v = iov; 1163 if (f->f_type == F_WALL) { 1164 v->iov_base = greetings; 1165 /* The time displayed is not synchornized with the other log 1166 * destinations (like messages). Following fragment was using 1167 * ctime(&now), which was updating the time every 30 sec. 1168 * With f_lasttime, time is synchronized correctly. 1169 */ 1170 v->iov_len = snprintf(greetings, sizeof greetings, 1171 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1172 f->f_prevhost, f->f_lasttime); 1173 if (v->iov_len >= sizeof greetings) 1174 v->iov_len = sizeof greetings - 1; 1175 v++; 1176 v->iov_base = nul; 1177 v->iov_len = 0; 1178 v++; 1179 } else { 1180 v->iov_base = f->f_lasttime; 1181 v->iov_len = strlen(f->f_lasttime); 1182 v++; 1183 v->iov_base = space; 1184 v->iov_len = 1; 1185 v++; 1186 } 1187 1188 if (LogFacPri) { 1189 static char fp_buf[30]; /* Hollow laugh */ 1190 int fac = f->f_prevpri & LOG_FACMASK; 1191 int pri = LOG_PRI(f->f_prevpri); 1192 const char *f_s = NULL; 1193 char f_n[5]; /* Hollow laugh */ 1194 const char *p_s = NULL; 1195 char p_n[5]; /* Hollow laugh */ 1196 1197 if (LogFacPri > 1) { 1198 const CODE *c; 1199 1200 for (c = facilitynames; c->c_name; c++) { 1201 if (c->c_val == fac) { 1202 f_s = c->c_name; 1203 break; 1204 } 1205 } 1206 for (c = prioritynames; c->c_name; c++) { 1207 if (c->c_val == pri) { 1208 p_s = c->c_name; 1209 break; 1210 } 1211 } 1212 } 1213 if (!f_s) { 1214 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1215 f_s = f_n; 1216 } 1217 if (!p_s) { 1218 snprintf(p_n, sizeof p_n, "%d", pri); 1219 p_s = p_n; 1220 } 1221 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1222 v->iov_base = fp_buf; 1223 v->iov_len = strlen(fp_buf); 1224 } else { 1225 v->iov_base = nul; 1226 v->iov_len = 0; 1227 } 1228 v++; 1229 1230 v->iov_base = f->f_prevhost; 1231 v->iov_len = strlen(v->iov_base); 1232 v++; 1233 v->iov_base = space; 1234 v->iov_len = 1; 1235 v++; 1236 1237 if (msg) { 1238 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1239 if (wmsg == NULL) { 1240 logerror("strdup"); 1241 exit(1); 1242 } 1243 v->iov_base = wmsg; 1244 v->iov_len = strlen(msg); 1245 } else if (f->f_prevcount > 1) { 1246 v->iov_base = repbuf; 1247 v->iov_len = snprintf(repbuf, sizeof repbuf, 1248 "last message repeated %d times", f->f_prevcount); 1249 } else { 1250 v->iov_base = f->f_prevline; 1251 v->iov_len = f->f_prevlen; 1252 } 1253 v++; 1254 1255 dprintf("Logging to %s", TypeNames[f->f_type]); 1256 f->f_time = now; 1257 1258 switch (f->f_type) { 1259 int port; 1260 case F_UNUSED: 1261 dprintf("\n"); 1262 break; 1263 1264 case F_FORW: 1265 port = (int)ntohs(((struct sockaddr_in *) 1266 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1267 if (port != 514) { 1268 dprintf(" %s:%d\n", f->f_un.f_forw.f_hname, port); 1269 } else { 1270 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1271 } 1272 /* check for local vs remote messages */ 1273 if (strcasecmp(f->f_prevhost, LocalHostName)) 1274 l = snprintf(line, sizeof line - 1, 1275 "<%d>%.15s Forwarded from %s: %s", 1276 f->f_prevpri, (char *)iov[0].iov_base, 1277 f->f_prevhost, (char *)iov[5].iov_base); 1278 else 1279 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1280 f->f_prevpri, (char *)iov[0].iov_base, 1281 (char *)iov[5].iov_base); 1282 if (l < 0) 1283 l = 0; 1284 else if (l > MAXLINE) 1285 l = MAXLINE; 1286 1287 if (finet) { 1288 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1289 for (i = 0; i < *finet; i++) { 1290#if 0 1291 /* 1292 * should we check AF first, or just 1293 * trial and error? FWD 1294 */ 1295 if (r->ai_family == 1296 address_family_of(finet[i+1])) 1297#endif 1298 lsent = sendto(finet[i+1], line, l, 0, 1299 r->ai_addr, r->ai_addrlen); 1300 if (lsent == l) 1301 break; 1302 } 1303 if (lsent == l && !send_to_all) 1304 break; 1305 } 1306 dprintf("lsent/l: %d/%d\n", lsent, l); 1307 if (lsent != l) { 1308 int e = errno; 1309 logerror("sendto"); 1310 errno = e; 1311 switch (errno) { 1312 case ENOBUFS: 1313 case ENETDOWN: 1314 case ENETUNREACH: 1315 case EHOSTUNREACH: 1316 case EHOSTDOWN: 1317 case EADDRNOTAVAIL: 1318 break; 1319 /* case EBADF: */ 1320 /* case EACCES: */ 1321 /* case ENOTSOCK: */ 1322 /* case EFAULT: */ 1323 /* case EMSGSIZE: */ 1324 /* case EAGAIN: */ 1325 /* case ENOBUFS: */ 1326 /* case ECONNREFUSED: */ 1327 default: 1328 dprintf("removing entry: errno=%d\n", e); 1329 f->f_type = F_UNUSED; 1330 break; 1331 } 1332 } 1333 } 1334 break; 1335 1336 case F_FILE: 1337 dprintf(" %s\n", f->f_un.f_fname); 1338 v->iov_base = lf; 1339 v->iov_len = 1; 1340 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1341 /* 1342 * If writev(2) fails for potentially transient errors 1343 * like the filesystem being full, ignore it. 1344 * Otherwise remove this logfile from the list. 1345 */ 1346 if (errno != ENOSPC) { 1347 int e = errno; 1348 close_filed(f); 1349 errno = e; 1350 logerror(f->f_un.f_fname); 1351 } 1352 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1353 f->f_flags |= FFLAG_NEEDSYNC; 1354 needdofsync = 1; 1355 } 1356 break; 1357 1358 case F_PIPE: 1359 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1360 v->iov_base = lf; 1361 v->iov_len = 1; 1362 if (f->f_un.f_pipe.f_pid == 0) { 1363 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1364 &f->f_un.f_pipe.f_pid)) < 0) { 1365 logerror(f->f_un.f_pipe.f_pname); 1366 break; 1367 } 1368 } 1369 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1370 int e = errno; 1371 1372 close_filed(f); 1373 deadq_enter(f->f_un.f_pipe.f_pid, 1374 f->f_un.f_pipe.f_pname); 1375 errno = e; 1376 logerror(f->f_un.f_pipe.f_pname); 1377 } 1378 break; 1379 1380 case F_CONSOLE: 1381 if (flags & IGN_CONS) { 1382 dprintf(" (ignored)\n"); 1383 break; 1384 } 1385 /* FALLTHROUGH */ 1386 1387 case F_TTY: 1388 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1389 v->iov_base = crlf; 1390 v->iov_len = 2; 1391 1392 errno = 0; /* ttymsg() only sometimes returns an errno */ 1393 if ((msgret = ttymsg(iov, IOV_SIZE, f->f_un.f_fname, 10))) { 1394 f->f_type = F_UNUSED; 1395 logerror(msgret); 1396 } 1397 break; 1398 1399 case F_USERS: 1400 case F_WALL: 1401 dprintf("\n"); 1402 v->iov_base = crlf; 1403 v->iov_len = 2; 1404 wallmsg(f, iov, IOV_SIZE); 1405 break; 1406 } 1407 f->f_prevcount = 0; 1408 free(wmsg); 1409} 1410 1411/* 1412 * WALLMSG -- Write a message to the world at large 1413 * 1414 * Write the specified message to either the entire 1415 * world, or a list of approved users. 1416 */ 1417static void 1418wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1419{ 1420 static int reenter; /* avoid calling ourselves */ 1421 struct utmpx *ut; 1422 int i; 1423 const char *p; 1424 1425 if (reenter++) 1426 return; 1427 setutxent(); 1428 /* NOSTRICT */ 1429 while ((ut = getutxent()) != NULL) { 1430 if (ut->ut_type != USER_PROCESS) 1431 continue; 1432 if (f->f_type == F_WALL) { 1433 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1434 TTYMSGTIME)) != NULL) { 1435 errno = 0; /* already in msg */ 1436 logerror(p); 1437 } 1438 continue; 1439 } 1440 /* should we send the message to this user? */ 1441 for (i = 0; i < MAXUNAMES; i++) { 1442 if (!f->f_un.f_uname[i][0]) 1443 break; 1444 if (!strcmp(f->f_un.f_uname[i], ut->ut_user)) { 1445 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1446 TTYMSGTIME)) != NULL) { 1447 errno = 0; /* already in msg */ 1448 logerror(p); 1449 } 1450 break; 1451 } 1452 } 1453 } 1454 endutxent(); 1455 reenter = 0; 1456} 1457 1458/* 1459 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1460 */ 1461static const char * 1462ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1463{ 1464 static char device[1024]; 1465 static char errbuf[1024]; 1466 struct stat sb; 1467 1468 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1469 1470 if (stat(device, &sb) < 0) { 1471 (void) snprintf(errbuf, sizeof(errbuf), 1472 "%s: %s", device, strerror(errno)); 1473 return (errbuf); 1474 } 1475 if ((sb.st_mode & S_IWGRP) == 0) 1476 /* Messages disabled. */ 1477 return (NULL); 1478 return ttymsg(iov, iovcnt, line, tmout); 1479} 1480 1481static void 1482reapchild(int signo __unused) 1483{ 1484 int status; 1485 pid_t pid; 1486 struct filed *f; 1487 1488 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1489 if (!Initialized) 1490 /* Don't tell while we are initting. */ 1491 continue; 1492 1493 /* First, look if it's a process from the dead queue. */ 1494 if (deadq_remove(pid)) 1495 goto oncemore; 1496 1497 /* Now, look in list of active processes. */ 1498 for (f = Files; f; f = f->f_next) 1499 if (f->f_type == F_PIPE && 1500 f->f_un.f_pipe.f_pid == pid) { 1501 close_filed(f); 1502 log_deadchild(pid, status, 1503 f->f_un.f_pipe.f_pname); 1504 break; 1505 } 1506 oncemore: 1507 continue; 1508 } 1509} 1510 1511/* 1512 * Return a printable representation of a host address. 1513 */ 1514static const char * 1515cvthname(struct sockaddr *f) 1516{ 1517 int error, hl; 1518 sigset_t omask, nmask; 1519 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1520 1521 error = getnameinfo((struct sockaddr *)f, 1522 ((struct sockaddr *)f)->sa_len, 1523 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 1524 dprintf("cvthname(%s)\n", ip); 1525 1526 if (error) { 1527 dprintf("Malformed from address %s\n", gai_strerror(error)); 1528 return ("???"); 1529 } 1530 if (!resolve) 1531 return (ip); 1532 1533 sigemptyset(&nmask); 1534 sigaddset(&nmask, SIGHUP); 1535 sigprocmask(SIG_BLOCK, &nmask, &omask); 1536 error = getnameinfo((struct sockaddr *)f, 1537 ((struct sockaddr *)f)->sa_len, 1538 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1539 sigprocmask(SIG_SETMASK, &omask, NULL); 1540 if (error) { 1541 dprintf("Host name for your address (%s) unknown\n", ip); 1542 return (ip); 1543 } 1544 hl = strlen(hname); 1545 if (hl > 0 && hname[hl-1] == '.') 1546 hname[--hl] = '\0'; 1547 trimdomain(hname, hl); 1548 return (hname); 1549} 1550 1551static void 1552dodie(int signo) 1553{ 1554 1555 WantDie = signo; 1556} 1557 1558static void 1559domark(int signo __unused) 1560{ 1561 1562 MarkSet = 1; 1563} 1564 1565/* 1566 * Print syslogd errors some place. 1567 */ 1568static void 1569logerror(const char *type) 1570{ 1571 char buf[512]; 1572 static int recursed = 0; 1573 1574 /* If there's an error while trying to log an error, give up. */ 1575 if (recursed) 1576 return; 1577 recursed++; 1578 if (errno) 1579 (void)snprintf(buf, 1580 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1581 else 1582 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1583 errno = 0; 1584 dprintf("%s\n", buf); 1585 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1586 recursed--; 1587} 1588 1589static void 1590die(int signo) 1591{ 1592 struct filed *f; 1593 struct funix *fx; 1594 int was_initialized; 1595 char buf[100]; 1596 1597 was_initialized = Initialized; 1598 Initialized = 0; /* Don't log SIGCHLDs. */ 1599 for (f = Files; f != NULL; f = f->f_next) { 1600 /* flush any pending output */ 1601 if (f->f_prevcount) 1602 fprintlog(f, 0, (char *)NULL); 1603 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) 1604 close_filed(f); 1605 } 1606 Initialized = was_initialized; 1607 if (signo) { 1608 dprintf("syslogd: exiting on signal %d\n", signo); 1609 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1610 errno = 0; 1611 logerror(buf); 1612 } 1613 STAILQ_FOREACH(fx, &funixes, next) 1614 (void)unlink(fx->name); 1615 pidfile_remove(pfh); 1616 1617 exit(1); 1618} 1619 1620static int 1621configfiles(const struct dirent *dp) 1622{ 1623 const char *p; 1624 size_t ext_len; 1625 1626 if (dp->d_name[0] == '.') 1627 return (0); 1628 1629 ext_len = sizeof(include_ext) -1; 1630 1631 if (dp->d_namlen <= ext_len) 1632 return (0); 1633 1634 p = &dp->d_name[dp->d_namlen - ext_len]; 1635 if (strcmp(p, include_ext) != 0) 1636 return (0); 1637 1638 return (1); 1639} 1640 1641static struct filed ** 1642readconfigfile(FILE *cf, struct filed **nextp, int allow_includes) 1643{ 1644 FILE *cf2; 1645 struct filed *f; 1646 struct dirent **ent; 1647 char cline[LINE_MAX]; 1648 char host[MAXHOSTNAMELEN]; 1649 char prog[LINE_MAX]; 1650 char file[MAXPATHLEN]; 1651 char *p, *tmp; 1652 int i, nents; 1653 size_t include_len; 1654 1655 /* 1656 * Foreach line in the conf table, open that file. 1657 */ 1658 f = NULL; 1659 include_len = sizeof(include_str) -1; 1660 (void)strlcpy(host, "*", sizeof(host)); 1661 (void)strlcpy(prog, "*", sizeof(prog)); 1662 while (fgets(cline, sizeof(cline), cf) != NULL) { 1663 /* 1664 * check for end-of-section, comments, strip off trailing 1665 * spaces and newline character. #!prog is treated specially: 1666 * following lines apply only to that program. 1667 */ 1668 for (p = cline; isspace(*p); ++p) 1669 continue; 1670 if (*p == 0) 1671 continue; 1672 if (allow_includes && 1673 strncmp(p, include_str, include_len) == 0 && 1674 isspace(p[include_len])) { 1675 p += include_len; 1676 while (isspace(*p)) 1677 p++; 1678 tmp = p; 1679 while (*tmp != '\0' && !isspace(*tmp)) 1680 tmp++; 1681 *tmp = '\0'; 1682 dprintf("Trying to include files in '%s'\n", p); 1683 nents = scandir(p, &ent, configfiles, alphasort); 1684 if (nents == -1) { 1685 dprintf("Unable to open '%s': %s\n", p, 1686 strerror(errno)); 1687 continue; 1688 } 1689 for (i = 0; i < nents; i++) { 1690 if (snprintf(file, sizeof(file), "%s/%s", p, 1691 ent[i]->d_name) >= (int)sizeof(file)) { 1692 dprintf("ignoring path too long: " 1693 "'%s/%s'\n", p, ent[i]->d_name); 1694 free(ent[i]); 1695 continue; 1696 } 1697 free(ent[i]); 1698 cf2 = fopen(file, "r"); 1699 if (cf2 == NULL) 1700 continue; 1701 dprintf("reading %s\n", file); 1702 nextp = readconfigfile(cf2, nextp, 0); 1703 fclose(cf2); 1704 } 1705 free(ent); 1706 continue; 1707 } 1708 if (*p == '#') { 1709 p++; 1710 if (*p != '!' && *p != '+' && *p != '-') 1711 continue; 1712 } 1713 if (*p == '+' || *p == '-') { 1714 host[0] = *p++; 1715 while (isspace(*p)) 1716 p++; 1717 if ((!*p) || (*p == '*')) { 1718 (void)strlcpy(host, "*", sizeof(host)); 1719 continue; 1720 } 1721 if (*p == '@') 1722 p = LocalHostName; 1723 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1724 if (!isalnum(*p) && *p != '.' && *p != '-' 1725 && *p != ',' && *p != ':' && *p != '%') 1726 break; 1727 host[i] = *p++; 1728 } 1729 host[i] = '\0'; 1730 continue; 1731 } 1732 if (*p == '!') { 1733 p++; 1734 while (isspace(*p)) p++; 1735 if ((!*p) || (*p == '*')) { 1736 (void)strlcpy(prog, "*", sizeof(prog)); 1737 continue; 1738 } 1739 for (i = 0; i < LINE_MAX - 1; i++) { 1740 if (!isprint(p[i]) || isspace(p[i])) 1741 break; 1742 prog[i] = p[i]; 1743 } 1744 prog[i] = 0; 1745 continue; 1746 } 1747 for (p = cline + 1; *p != '\0'; p++) { 1748 if (*p != '#') 1749 continue; 1750 if (*(p - 1) == '\\') { 1751 strcpy(p - 1, p); 1752 p--; 1753 continue; 1754 } 1755 *p = '\0'; 1756 break; 1757 } 1758 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1759 cline[i] = '\0'; 1760 f = (struct filed *)calloc(1, sizeof(*f)); 1761 if (f == NULL) { 1762 logerror("calloc"); 1763 exit(1); 1764 } 1765 *nextp = f; 1766 nextp = &f->f_next; 1767 cfline(cline, f, prog, host); 1768 } 1769 return nextp; 1770} 1771 1772/* 1773 * INIT -- Initialize syslogd from configuration table 1774 */ 1775static void 1776init(int signo) 1777{ 1778 int i; 1779 FILE *cf; 1780 struct filed *f, *next, **nextp; 1781 char *p; 1782 char oldLocalHostName[MAXHOSTNAMELEN]; 1783 char hostMsg[2*MAXHOSTNAMELEN+40]; 1784 char bootfileMsg[LINE_MAX]; 1785 1786 dprintf("init\n"); 1787 1788 /* 1789 * Load hostname (may have changed). 1790 */ 1791 if (signo != 0) 1792 (void)strlcpy(oldLocalHostName, LocalHostName, 1793 sizeof(oldLocalHostName)); 1794 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1795 err(EX_OSERR, "gethostname() failed"); 1796 if ((p = strchr(LocalHostName, '.')) != NULL) { 1797 *p++ = '\0'; 1798 LocalDomain = p; 1799 } else { 1800 LocalDomain = ""; 1801 } 1802 1803 /* 1804 * Load / reload timezone data (in case it changed). 1805 * 1806 * Just calling tzset() again does not work, the timezone code 1807 * caches the result. However, by setting the TZ variable, one 1808 * can defeat the caching and have the timezone code really 1809 * reload the timezone data. Respect any initial setting of 1810 * TZ, in case the system is configured specially. 1811 */ 1812 dprintf("loading timezone data via tzset()\n"); 1813 if (getenv("TZ")) { 1814 tzset(); 1815 } else { 1816 setenv("TZ", ":/etc/localtime", 1); 1817 tzset(); 1818 unsetenv("TZ"); 1819 } 1820 1821 /* 1822 * Close all open log files. 1823 */ 1824 Initialized = 0; 1825 for (f = Files; f != NULL; f = next) { 1826 /* flush any pending output */ 1827 if (f->f_prevcount) 1828 fprintlog(f, 0, (char *)NULL); 1829 1830 switch (f->f_type) { 1831 case F_FILE: 1832 case F_FORW: 1833 case F_CONSOLE: 1834 case F_TTY: 1835 close_filed(f); 1836 break; 1837 case F_PIPE: 1838 close_filed(f); 1839 deadq_enter(f->f_un.f_pipe.f_pid, 1840 f->f_un.f_pipe.f_pname); 1841 break; 1842 } 1843 next = f->f_next; 1844 if (f->f_program) free(f->f_program); 1845 if (f->f_host) free(f->f_host); 1846 free((char *)f); 1847 } 1848 Files = NULL; 1849 nextp = &Files; 1850 1851 /* open the configuration file */ 1852 if ((cf = fopen(ConfFile, "r")) == NULL) { 1853 dprintf("cannot open %s\n", ConfFile); 1854 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1855 if (*nextp == NULL) { 1856 logerror("calloc"); 1857 exit(1); 1858 } 1859 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1860 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1861 if ((*nextp)->f_next == NULL) { 1862 logerror("calloc"); 1863 exit(1); 1864 } 1865 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1866 Initialized = 1; 1867 return; 1868 } 1869 1870 readconfigfile(cf, &Files, 1); 1871 1872 /* close the configuration file */ 1873 (void)fclose(cf); 1874 1875 Initialized = 1; 1876 1877 if (Debug) { 1878 int port; 1879 for (f = Files; f; f = f->f_next) { 1880 for (i = 0; i <= LOG_NFACILITIES; i++) 1881 if (f->f_pmask[i] == INTERNAL_NOPRI) 1882 printf("X "); 1883 else 1884 printf("%d ", f->f_pmask[i]); 1885 printf("%s: ", TypeNames[f->f_type]); 1886 switch (f->f_type) { 1887 case F_FILE: 1888 printf("%s", f->f_un.f_fname); 1889 break; 1890 1891 case F_CONSOLE: 1892 case F_TTY: 1893 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1894 break; 1895 1896 case F_FORW: 1897 port = (int)ntohs(((struct sockaddr_in *) 1898 (f->f_un.f_forw.f_addr->ai_addr))->sin_port); 1899 if (port != 514) { 1900 printf("%s:%d", 1901 f->f_un.f_forw.f_hname, port); 1902 } else { 1903 printf("%s", f->f_un.f_forw.f_hname); 1904 } 1905 break; 1906 1907 case F_PIPE: 1908 printf("%s", f->f_un.f_pipe.f_pname); 1909 break; 1910 1911 case F_USERS: 1912 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1913 printf("%s, ", f->f_un.f_uname[i]); 1914 break; 1915 } 1916 if (f->f_program) 1917 printf(" (%s)", f->f_program); 1918 printf("\n"); 1919 } 1920 } 1921 1922 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1923 dprintf("syslogd: restarted\n"); 1924 /* 1925 * Log a change in hostname, but only on a restart. 1926 */ 1927 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1928 (void)snprintf(hostMsg, sizeof(hostMsg), 1929 "syslogd: hostname changed, \"%s\" to \"%s\"", 1930 oldLocalHostName, LocalHostName); 1931 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1932 dprintf("%s\n", hostMsg); 1933 } 1934 /* 1935 * Log the kernel boot file if we aren't going to use it as 1936 * the prefix, and if this is *not* a restart. 1937 */ 1938 if (signo == 0 && !use_bootfile) { 1939 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1940 "syslogd: kernel boot file is %s", bootfile); 1941 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1942 dprintf("%s\n", bootfileMsg); 1943 } 1944} 1945 1946/* 1947 * Crack a configuration file line 1948 */ 1949static void 1950cfline(const char *line, struct filed *f, const char *prog, const char *host) 1951{ 1952 struct addrinfo hints, *res; 1953 int error, i, pri, syncfile; 1954 const char *p, *q; 1955 char *bp; 1956 char buf[MAXLINE], ebuf[100]; 1957 1958 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1959 1960 errno = 0; /* keep strerror() stuff out of logerror messages */ 1961 1962 /* clear out file entry */ 1963 memset(f, 0, sizeof(*f)); 1964 for (i = 0; i <= LOG_NFACILITIES; i++) 1965 f->f_pmask[i] = INTERNAL_NOPRI; 1966 1967 /* save hostname if any */ 1968 if (host && *host == '*') 1969 host = NULL; 1970 if (host) { 1971 int hl; 1972 1973 f->f_host = strdup(host); 1974 if (f->f_host == NULL) { 1975 logerror("strdup"); 1976 exit(1); 1977 } 1978 hl = strlen(f->f_host); 1979 if (hl > 0 && f->f_host[hl-1] == '.') 1980 f->f_host[--hl] = '\0'; 1981 trimdomain(f->f_host, hl); 1982 } 1983 1984 /* save program name if any */ 1985 if (prog && *prog == '*') 1986 prog = NULL; 1987 if (prog) { 1988 f->f_program = strdup(prog); 1989 if (f->f_program == NULL) { 1990 logerror("strdup"); 1991 exit(1); 1992 } 1993 } 1994 1995 /* scan through the list of selectors */ 1996 for (p = line; *p && *p != '\t' && *p != ' ';) { 1997 int pri_done; 1998 int pri_cmp; 1999 int pri_invert; 2000 2001 /* find the end of this facility name list */ 2002 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2003 continue; 2004 2005 /* get the priority comparison */ 2006 pri_cmp = 0; 2007 pri_done = 0; 2008 pri_invert = 0; 2009 if (*q == '!') { 2010 pri_invert = 1; 2011 q++; 2012 } 2013 while (!pri_done) { 2014 switch (*q) { 2015 case '<': 2016 pri_cmp |= PRI_LT; 2017 q++; 2018 break; 2019 case '=': 2020 pri_cmp |= PRI_EQ; 2021 q++; 2022 break; 2023 case '>': 2024 pri_cmp |= PRI_GT; 2025 q++; 2026 break; 2027 default: 2028 pri_done++; 2029 break; 2030 } 2031 } 2032 2033 /* collect priority name */ 2034 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2035 *bp++ = *q++; 2036 *bp = '\0'; 2037 2038 /* skip cruft */ 2039 while (strchr(",;", *q)) 2040 q++; 2041 2042 /* decode priority name */ 2043 if (*buf == '*') { 2044 pri = LOG_PRIMASK; 2045 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2046 } else { 2047 /* Ignore trailing spaces. */ 2048 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2049 buf[i] = '\0'; 2050 2051 pri = decode(buf, prioritynames); 2052 if (pri < 0) { 2053 errno = 0; 2054 (void)snprintf(ebuf, sizeof ebuf, 2055 "unknown priority name \"%s\"", buf); 2056 logerror(ebuf); 2057 return; 2058 } 2059 } 2060 if (!pri_cmp) 2061 pri_cmp = (UniquePriority) 2062 ? (PRI_EQ) 2063 : (PRI_EQ | PRI_GT) 2064 ; 2065 if (pri_invert) 2066 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2067 2068 /* scan facilities */ 2069 while (*p && !strchr("\t.; ", *p)) { 2070 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2071 *bp++ = *p++; 2072 *bp = '\0'; 2073 2074 if (*buf == '*') { 2075 for (i = 0; i < LOG_NFACILITIES; i++) { 2076 f->f_pmask[i] = pri; 2077 f->f_pcmp[i] = pri_cmp; 2078 } 2079 } else { 2080 i = decode(buf, facilitynames); 2081 if (i < 0) { 2082 errno = 0; 2083 (void)snprintf(ebuf, sizeof ebuf, 2084 "unknown facility name \"%s\"", 2085 buf); 2086 logerror(ebuf); 2087 return; 2088 } 2089 f->f_pmask[i >> 3] = pri; 2090 f->f_pcmp[i >> 3] = pri_cmp; 2091 } 2092 while (*p == ',' || *p == ' ') 2093 p++; 2094 } 2095 2096 p = q; 2097 } 2098 2099 /* skip to action part */ 2100 while (*p == '\t' || *p == ' ') 2101 p++; 2102 2103 if (*p == '-') { 2104 syncfile = 0; 2105 p++; 2106 } else 2107 syncfile = 1; 2108 2109 switch (*p) { 2110 case '@': 2111 { 2112 char *tp; 2113 char endkey = ':'; 2114 /* 2115 * scan forward to see if there is a port defined. 2116 * so we can't use strlcpy.. 2117 */ 2118 i = sizeof(f->f_un.f_forw.f_hname); 2119 tp = f->f_un.f_forw.f_hname; 2120 p++; 2121 2122 /* 2123 * an ipv6 address should start with a '[' in that case 2124 * we should scan for a ']' 2125 */ 2126 if (*p == '[') { 2127 p++; 2128 endkey = ']'; 2129 } 2130 while (*p && (*p != endkey) && (i-- > 0)) { 2131 *tp++ = *p++; 2132 } 2133 if (endkey == ']' && *p == endkey) 2134 p++; 2135 *tp = '\0'; 2136 } 2137 /* See if we copied a domain and have a port */ 2138 if (*p == ':') 2139 p++; 2140 else 2141 p = NULL; 2142 2143 memset(&hints, 0, sizeof(hints)); 2144 hints.ai_family = family; 2145 hints.ai_socktype = SOCK_DGRAM; 2146 error = getaddrinfo(f->f_un.f_forw.f_hname, 2147 p ? p : "syslog", &hints, &res); 2148 if (error) { 2149 logerror(gai_strerror(error)); 2150 break; 2151 } 2152 f->f_un.f_forw.f_addr = res; 2153 f->f_type = F_FORW; 2154 break; 2155 2156 case '/': 2157 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2158 f->f_type = F_UNUSED; 2159 logerror(p); 2160 break; 2161 } 2162 if (syncfile) 2163 f->f_flags |= FFLAG_SYNC; 2164 if (isatty(f->f_file)) { 2165 if (strcmp(p, ctty) == 0) 2166 f->f_type = F_CONSOLE; 2167 else 2168 f->f_type = F_TTY; 2169 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 2170 sizeof(f->f_un.f_fname)); 2171 } else { 2172 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 2173 f->f_type = F_FILE; 2174 } 2175 break; 2176 2177 case '|': 2178 f->f_un.f_pipe.f_pid = 0; 2179 (void)strlcpy(f->f_un.f_pipe.f_pname, p + 1, 2180 sizeof(f->f_un.f_pipe.f_pname)); 2181 f->f_type = F_PIPE; 2182 break; 2183 2184 case '*': 2185 f->f_type = F_WALL; 2186 break; 2187 2188 default: 2189 for (i = 0; i < MAXUNAMES && *p; i++) { 2190 for (q = p; *q && *q != ','; ) 2191 q++; 2192 (void)strncpy(f->f_un.f_uname[i], p, MAXLOGNAME - 1); 2193 if ((q - p) >= MAXLOGNAME) 2194 f->f_un.f_uname[i][MAXLOGNAME - 1] = '\0'; 2195 else 2196 f->f_un.f_uname[i][q - p] = '\0'; 2197 while (*q == ',' || *q == ' ') 2198 q++; 2199 p = q; 2200 } 2201 f->f_type = F_USERS; 2202 break; 2203 } 2204} 2205 2206 2207/* 2208 * Decode a symbolic name to a numeric value 2209 */ 2210static int 2211decode(const char *name, const CODE *codetab) 2212{ 2213 const CODE *c; 2214 char *p, buf[40]; 2215 2216 if (isdigit(*name)) 2217 return (atoi(name)); 2218 2219 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2220 if (isupper(*name)) 2221 *p = tolower(*name); 2222 else 2223 *p = *name; 2224 } 2225 *p = '\0'; 2226 for (c = codetab; c->c_name; c++) 2227 if (!strcmp(buf, c->c_name)) 2228 return (c->c_val); 2229 2230 return (-1); 2231} 2232 2233static void 2234markit(void) 2235{ 2236 struct filed *f; 2237 dq_t q, next; 2238 2239 now = time((time_t *)NULL); 2240 MarkSeq += TIMERINTVL; 2241 if (MarkSeq >= MarkInterval) { 2242 logmsg(LOG_INFO, "-- MARK --", 2243 LocalHostName, ADDDATE|MARK); 2244 MarkSeq = 0; 2245 } 2246 2247 for (f = Files; f; f = f->f_next) { 2248 if (f->f_prevcount && now >= REPEATTIME(f)) { 2249 dprintf("flush %s: repeated %d times, %d sec.\n", 2250 TypeNames[f->f_type], f->f_prevcount, 2251 repeatinterval[f->f_repeatcount]); 2252 fprintlog(f, 0, (char *)NULL); 2253 BACKOFF(f); 2254 } 2255 } 2256 2257 /* Walk the dead queue, and see if we should signal somebody. */ 2258 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2259 next = TAILQ_NEXT(q, dq_entries); 2260 2261 switch (q->dq_timeout) { 2262 case 0: 2263 /* Already signalled once, try harder now. */ 2264 if (kill(q->dq_pid, SIGKILL) != 0) 2265 (void)deadq_remove(q->dq_pid); 2266 break; 2267 2268 case 1: 2269 /* 2270 * Timed out on dead queue, send terminate 2271 * signal. Note that we leave the removal 2272 * from the dead queue to reapchild(), which 2273 * will also log the event (unless the process 2274 * didn't even really exist, in case we simply 2275 * drop it from the dead queue). 2276 */ 2277 if (kill(q->dq_pid, SIGTERM) != 0) 2278 (void)deadq_remove(q->dq_pid); 2279 /* FALLTHROUGH */ 2280 2281 default: 2282 q->dq_timeout--; 2283 } 2284 } 2285 MarkSet = 0; 2286 (void)alarm(TIMERINTVL); 2287} 2288 2289/* 2290 * fork off and become a daemon, but wait for the child to come online 2291 * before returning to the parent, or we get disk thrashing at boot etc. 2292 * Set a timer so we don't hang forever if it wedges. 2293 */ 2294static int 2295waitdaemon(int nochdir, int noclose, int maxwait) 2296{ 2297 int fd; 2298 int status; 2299 pid_t pid, childpid; 2300 2301 switch (childpid = fork()) { 2302 case -1: 2303 return (-1); 2304 case 0: 2305 break; 2306 default: 2307 signal(SIGALRM, timedout); 2308 alarm(maxwait); 2309 while ((pid = wait3(&status, 0, NULL)) != -1) { 2310 if (WIFEXITED(status)) 2311 errx(1, "child pid %d exited with return code %d", 2312 pid, WEXITSTATUS(status)); 2313 if (WIFSIGNALED(status)) 2314 errx(1, "child pid %d exited on signal %d%s", 2315 pid, WTERMSIG(status), 2316 WCOREDUMP(status) ? " (core dumped)" : 2317 ""); 2318 if (pid == childpid) /* it's gone... */ 2319 break; 2320 } 2321 exit(0); 2322 } 2323 2324 if (setsid() == -1) 2325 return (-1); 2326 2327 if (!nochdir) 2328 (void)chdir("/"); 2329 2330 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2331 (void)dup2(fd, STDIN_FILENO); 2332 (void)dup2(fd, STDOUT_FILENO); 2333 (void)dup2(fd, STDERR_FILENO); 2334 if (fd > 2) 2335 (void)close (fd); 2336 } 2337 return (getppid()); 2338} 2339 2340/* 2341 * We get a SIGALRM from the child when it's running and finished doing it's 2342 * fsync()'s or O_SYNC writes for all the boot messages. 2343 * 2344 * We also get a signal from the kernel if the timer expires, so check to 2345 * see what happened. 2346 */ 2347static void 2348timedout(int sig __unused) 2349{ 2350 int left; 2351 left = alarm(0); 2352 signal(SIGALRM, SIG_DFL); 2353 if (left == 0) 2354 errx(1, "timed out waiting for child"); 2355 else 2356 _exit(0); 2357} 2358 2359/* 2360 * Add `s' to the list of allowable peer addresses to accept messages 2361 * from. 2362 * 2363 * `s' is a string in the form: 2364 * 2365 * [*]domainname[:{servicename|portnumber|*}] 2366 * 2367 * or 2368 * 2369 * netaddr/maskbits[:{servicename|portnumber|*}] 2370 * 2371 * Returns -1 on error, 0 if the argument was valid. 2372 */ 2373static int 2374allowaddr(char *s) 2375{ 2376 char *cp1, *cp2; 2377 struct allowedpeer ap; 2378 struct servent *se; 2379 int masklen = -1; 2380 struct addrinfo hints, *res; 2381 struct in_addr *addrp, *maskp; 2382#ifdef INET6 2383 int i; 2384 u_int32_t *addr6p, *mask6p; 2385#endif 2386 char ip[NI_MAXHOST]; 2387 2388#ifdef INET6 2389 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2390#endif 2391 cp1 = s; 2392 if ((cp1 = strrchr(cp1, ':'))) { 2393 /* service/port provided */ 2394 *cp1++ = '\0'; 2395 if (strlen(cp1) == 1 && *cp1 == '*') 2396 /* any port allowed */ 2397 ap.port = 0; 2398 else if ((se = getservbyname(cp1, "udp"))) { 2399 ap.port = ntohs(se->s_port); 2400 } else { 2401 ap.port = strtol(cp1, &cp2, 0); 2402 if (*cp2 != '\0') 2403 return (-1); /* port not numeric */ 2404 } 2405 } else { 2406 if ((se = getservbyname("syslog", "udp"))) 2407 ap.port = ntohs(se->s_port); 2408 else 2409 /* sanity, should not happen */ 2410 ap.port = 514; 2411 } 2412 2413 if ((cp1 = strchr(s, '/')) != NULL && 2414 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2415 *cp1 = '\0'; 2416 if ((masklen = atoi(cp1 + 1)) < 0) 2417 return (-1); 2418 } 2419#ifdef INET6 2420 if (*s == '[') { 2421 cp2 = s + strlen(s) - 1; 2422 if (*cp2 == ']') { 2423 ++s; 2424 *cp2 = '\0'; 2425 } else { 2426 cp2 = NULL; 2427 } 2428 } else { 2429 cp2 = NULL; 2430 } 2431#endif 2432 memset(&hints, 0, sizeof(hints)); 2433 hints.ai_family = PF_UNSPEC; 2434 hints.ai_socktype = SOCK_DGRAM; 2435 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2436 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2437 ap.isnumeric = 1; 2438 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2439 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2440 ap.a_mask.ss_family = res->ai_family; 2441 if (res->ai_family == AF_INET) { 2442 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2443 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2444 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2445 if (masklen < 0) { 2446 /* use default netmask */ 2447 if (IN_CLASSA(ntohl(addrp->s_addr))) 2448 maskp->s_addr = htonl(IN_CLASSA_NET); 2449 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2450 maskp->s_addr = htonl(IN_CLASSB_NET); 2451 else 2452 maskp->s_addr = htonl(IN_CLASSC_NET); 2453 } else if (masklen <= 32) { 2454 /* convert masklen to netmask */ 2455 if (masklen == 0) 2456 maskp->s_addr = 0; 2457 else 2458 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2459 } else { 2460 freeaddrinfo(res); 2461 return (-1); 2462 } 2463 /* Lose any host bits in the network number. */ 2464 addrp->s_addr &= maskp->s_addr; 2465 } 2466#ifdef INET6 2467 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2468 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2469 if (masklen < 0) 2470 masklen = 128; 2471 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2472 /* convert masklen to netmask */ 2473 while (masklen > 0) { 2474 if (masklen < 32) { 2475 *mask6p = htonl(~(0xffffffff >> masklen)); 2476 break; 2477 } 2478 *mask6p++ = 0xffffffff; 2479 masklen -= 32; 2480 } 2481 /* Lose any host bits in the network number. */ 2482 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2483 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2484 for (i = 0; i < 4; i++) 2485 addr6p[i] &= mask6p[i]; 2486 } 2487#endif 2488 else { 2489 freeaddrinfo(res); 2490 return (-1); 2491 } 2492 freeaddrinfo(res); 2493 } else { 2494 /* arg `s' is domain name */ 2495 ap.isnumeric = 0; 2496 ap.a_name = s; 2497 if (cp1) 2498 *cp1 = '/'; 2499#ifdef INET6 2500 if (cp2) { 2501 *cp2 = ']'; 2502 --s; 2503 } 2504#endif 2505 } 2506 2507 if (Debug) { 2508 printf("allowaddr: rule %d: ", NumAllowed); 2509 if (ap.isnumeric) { 2510 printf("numeric, "); 2511 getnameinfo((struct sockaddr *)&ap.a_addr, 2512 ((struct sockaddr *)&ap.a_addr)->sa_len, 2513 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2514 printf("addr = %s, ", ip); 2515 getnameinfo((struct sockaddr *)&ap.a_mask, 2516 ((struct sockaddr *)&ap.a_mask)->sa_len, 2517 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2518 printf("mask = %s; ", ip); 2519 } else { 2520 printf("domainname = %s; ", ap.a_name); 2521 } 2522 printf("port = %d\n", ap.port); 2523 } 2524 2525 if ((AllowedPeers = realloc(AllowedPeers, 2526 ++NumAllowed * sizeof(struct allowedpeer))) 2527 == NULL) { 2528 logerror("realloc"); 2529 exit(1); 2530 } 2531 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2532 return (0); 2533} 2534 2535/* 2536 * Validate that the remote peer has permission to log to us. 2537 */ 2538static int 2539validate(struct sockaddr *sa, const char *hname) 2540{ 2541 int i; 2542 size_t l1, l2; 2543 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2544 struct allowedpeer *ap; 2545 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2546#ifdef INET6 2547 int j, reject; 2548 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2549#endif 2550 struct addrinfo hints, *res; 2551 u_short sport; 2552 2553 if (NumAllowed == 0) 2554 /* traditional behaviour, allow everything */ 2555 return (1); 2556 2557 (void)strlcpy(name, hname, sizeof(name)); 2558 memset(&hints, 0, sizeof(hints)); 2559 hints.ai_family = PF_UNSPEC; 2560 hints.ai_socktype = SOCK_DGRAM; 2561 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2562 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2563 freeaddrinfo(res); 2564 else if (strchr(name, '.') == NULL) { 2565 strlcat(name, ".", sizeof name); 2566 strlcat(name, LocalDomain, sizeof name); 2567 } 2568 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2569 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2570 return (0); /* for safety, should not occur */ 2571 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2572 ip, port, name); 2573 sport = atoi(port); 2574 2575 /* now, walk down the list */ 2576 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2577 if (ap->port != 0 && ap->port != sport) { 2578 dprintf("rejected in rule %d due to port mismatch.\n", i); 2579 continue; 2580 } 2581 2582 if (ap->isnumeric) { 2583 if (ap->a_addr.ss_family != sa->sa_family) { 2584 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2585 continue; 2586 } 2587 if (ap->a_addr.ss_family == AF_INET) { 2588 sin4 = (struct sockaddr_in *)sa; 2589 a4p = (struct sockaddr_in *)&ap->a_addr; 2590 m4p = (struct sockaddr_in *)&ap->a_mask; 2591 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2592 != a4p->sin_addr.s_addr) { 2593 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2594 continue; 2595 } 2596 } 2597#ifdef INET6 2598 else if (ap->a_addr.ss_family == AF_INET6) { 2599 sin6 = (struct sockaddr_in6 *)sa; 2600 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2601 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2602 if (a6p->sin6_scope_id != 0 && 2603 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2604 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2605 continue; 2606 } 2607 reject = 0; 2608 for (j = 0; j < 16; j += 4) { 2609 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2610 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2611 ++reject; 2612 break; 2613 } 2614 } 2615 if (reject) { 2616 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2617 continue; 2618 } 2619 } 2620#endif 2621 else 2622 continue; 2623 } else { 2624 cp = ap->a_name; 2625 l1 = strlen(name); 2626 if (*cp == '*') { 2627 /* allow wildmatch */ 2628 cp++; 2629 l2 = strlen(cp); 2630 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2631 dprintf("rejected in rule %d due to name mismatch.\n", i); 2632 continue; 2633 } 2634 } else { 2635 /* exact match */ 2636 l2 = strlen(cp); 2637 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2638 dprintf("rejected in rule %d due to name mismatch.\n", i); 2639 continue; 2640 } 2641 } 2642 } 2643 dprintf("accepted in rule %d.\n", i); 2644 return (1); /* hooray! */ 2645 } 2646 return (0); 2647} 2648 2649/* 2650 * Fairly similar to popen(3), but returns an open descriptor, as 2651 * opposed to a FILE *. 2652 */ 2653static int 2654p_open(const char *prog, pid_t *rpid) 2655{ 2656 int pfd[2], nulldesc; 2657 pid_t pid; 2658 sigset_t omask, mask; 2659 char *argv[4]; /* sh -c cmd NULL */ 2660 char errmsg[200]; 2661 2662 if (pipe(pfd) == -1) 2663 return (-1); 2664 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2665 /* we are royally screwed anyway */ 2666 return (-1); 2667 2668 sigemptyset(&mask); 2669 sigaddset(&mask, SIGALRM); 2670 sigaddset(&mask, SIGHUP); 2671 sigprocmask(SIG_BLOCK, &mask, &omask); 2672 switch ((pid = fork())) { 2673 case -1: 2674 sigprocmask(SIG_SETMASK, &omask, 0); 2675 close(nulldesc); 2676 return (-1); 2677 2678 case 0: 2679 argv[0] = strdup("sh"); 2680 argv[1] = strdup("-c"); 2681 argv[2] = strdup(prog); 2682 argv[3] = NULL; 2683 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2684 logerror("strdup"); 2685 exit(1); 2686 } 2687 2688 alarm(0); 2689 (void)setsid(); /* Avoid catching SIGHUPs. */ 2690 2691 /* 2692 * Throw away pending signals, and reset signal 2693 * behaviour to standard values. 2694 */ 2695 signal(SIGALRM, SIG_IGN); 2696 signal(SIGHUP, SIG_IGN); 2697 sigprocmask(SIG_SETMASK, &omask, 0); 2698 signal(SIGPIPE, SIG_DFL); 2699 signal(SIGQUIT, SIG_DFL); 2700 signal(SIGALRM, SIG_DFL); 2701 signal(SIGHUP, SIG_DFL); 2702 2703 dup2(pfd[0], STDIN_FILENO); 2704 dup2(nulldesc, STDOUT_FILENO); 2705 dup2(nulldesc, STDERR_FILENO); 2706 closefrom(3); 2707 2708 (void)execvp(_PATH_BSHELL, argv); 2709 _exit(255); 2710 } 2711 2712 sigprocmask(SIG_SETMASK, &omask, 0); 2713 close(nulldesc); 2714 close(pfd[0]); 2715 /* 2716 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2717 * supposed to get an EWOULDBLOCK on writev(2), which is 2718 * caught by the logic above anyway, which will in turn close 2719 * the pipe, and fork a new logging subprocess if necessary. 2720 * The stale subprocess will be killed some time later unless 2721 * it terminated itself due to closing its input pipe (so we 2722 * get rid of really dead puppies). 2723 */ 2724 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2725 /* This is bad. */ 2726 (void)snprintf(errmsg, sizeof errmsg, 2727 "Warning: cannot change pipe to PID %d to " 2728 "non-blocking behaviour.", 2729 (int)pid); 2730 logerror(errmsg); 2731 } 2732 *rpid = pid; 2733 return (pfd[1]); 2734} 2735 2736static void 2737deadq_enter(pid_t pid, const char *name) 2738{ 2739 dq_t p; 2740 int status; 2741 2742 if (pid == 0) 2743 return; 2744 /* 2745 * Be paranoid, if we can't signal the process, don't enter it 2746 * into the dead queue (perhaps it's already dead). If possible, 2747 * we try to fetch and log the child's status. 2748 */ 2749 if (kill(pid, 0) != 0) { 2750 if (waitpid(pid, &status, WNOHANG) > 0) 2751 log_deadchild(pid, status, name); 2752 return; 2753 } 2754 2755 p = malloc(sizeof(struct deadq_entry)); 2756 if (p == NULL) { 2757 logerror("malloc"); 2758 exit(1); 2759 } 2760 2761 p->dq_pid = pid; 2762 p->dq_timeout = DQ_TIMO_INIT; 2763 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2764} 2765 2766static int 2767deadq_remove(pid_t pid) 2768{ 2769 dq_t q; 2770 2771 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2772 if (q->dq_pid == pid) { 2773 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2774 free(q); 2775 return (1); 2776 } 2777 } 2778 2779 return (0); 2780} 2781 2782static void 2783log_deadchild(pid_t pid, int status, const char *name) 2784{ 2785 int code; 2786 char buf[256]; 2787 const char *reason; 2788 2789 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2790 if (WIFSIGNALED(status)) { 2791 reason = "due to signal"; 2792 code = WTERMSIG(status); 2793 } else { 2794 reason = "with status"; 2795 code = WEXITSTATUS(status); 2796 if (code == 0) 2797 return; 2798 } 2799 (void)snprintf(buf, sizeof buf, 2800 "Logging subprocess %d (%s) exited %s %d.", 2801 pid, name, reason, code); 2802 logerror(buf); 2803} 2804 2805static int * 2806socksetup(int af, char *bindhostname) 2807{ 2808 struct addrinfo hints, *res, *r; 2809 const char *bindservice; 2810 char *cp; 2811 int error, maxs, *s, *socks; 2812 2813 /* 2814 * We have to handle this case for backwards compatibility: 2815 * If there are two (or more) colons but no '[' and ']', 2816 * assume this is an inet6 address without a service. 2817 */ 2818 bindservice = "syslog"; 2819 if (bindhostname != NULL) { 2820#ifdef INET6 2821 if (*bindhostname == '[' && 2822 (cp = strchr(bindhostname + 1, ']')) != NULL) { 2823 ++bindhostname; 2824 *cp = '\0'; 2825 if (cp[1] == ':' && cp[2] != '\0') 2826 bindservice = cp + 2; 2827 } else { 2828#endif 2829 cp = strchr(bindhostname, ':'); 2830 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2831 *cp = '\0'; 2832 if (cp[1] != '\0') 2833 bindservice = cp + 1; 2834 if (cp == bindhostname) 2835 bindhostname = NULL; 2836 } 2837#ifdef INET6 2838 } 2839#endif 2840 } 2841 2842 memset(&hints, 0, sizeof(hints)); 2843 hints.ai_flags = AI_PASSIVE; 2844 hints.ai_family = af; 2845 hints.ai_socktype = SOCK_DGRAM; 2846 error = getaddrinfo(bindhostname, bindservice, &hints, &res); 2847 if (error) { 2848 logerror(gai_strerror(error)); 2849 errno = 0; 2850 die(0); 2851 } 2852 2853 /* Count max number of sockets we may open */ 2854 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2855 socks = malloc((maxs+1) * sizeof(int)); 2856 if (socks == NULL) { 2857 logerror("couldn't allocate memory for sockets"); 2858 die(0); 2859 } 2860 2861 *socks = 0; /* num of sockets counter at start of array */ 2862 s = socks + 1; 2863 for (r = res; r; r = r->ai_next) { 2864 int on = 1; 2865 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2866 if (*s < 0) { 2867 logerror("socket"); 2868 continue; 2869 } 2870#ifdef INET6 2871 if (r->ai_family == AF_INET6) { 2872 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2873 (char *)&on, sizeof (on)) < 0) { 2874 logerror("setsockopt"); 2875 close(*s); 2876 continue; 2877 } 2878 } 2879#endif 2880 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, 2881 (char *)&on, sizeof (on)) < 0) { 2882 logerror("setsockopt"); 2883 close(*s); 2884 continue; 2885 } 2886 /* 2887 * RFC 3164 recommends that client side message 2888 * should come from the privileged syslogd port. 2889 * 2890 * If the system administrator choose not to obey 2891 * this, we can skip the bind() step so that the 2892 * system will choose a port for us. 2893 */ 2894 if (!NoBind) { 2895 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2896 logerror("bind"); 2897 close(*s); 2898 continue; 2899 } 2900 2901 if (!SecureMode) 2902 increase_rcvbuf(*s); 2903 } 2904 2905 (*socks)++; 2906 dprintf("socksetup: new socket fd is %d\n", *s); 2907 s++; 2908 } 2909 2910 if (*socks == 0) { 2911 free(socks); 2912 if (Debug) 2913 return (NULL); 2914 else 2915 die(0); 2916 } 2917 if (res) 2918 freeaddrinfo(res); 2919 2920 return (socks); 2921} 2922 2923static void 2924increase_rcvbuf(int fd) 2925{ 2926 socklen_t len, slen; 2927 2928 slen = sizeof(len); 2929 2930 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2931 if (len < RCVBUF_MINSIZE) { 2932 len = RCVBUF_MINSIZE; 2933 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2934 } 2935 } 2936} 2937