syslogd.c revision 129867
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43#endif 44#endif /* not lint */ 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.sbin/syslogd/syslogd.c 129867 2004-05-30 10:34:58Z dwmalone $"); 48 49/* 50 * syslogd -- log system messages 51 * 52 * This program implements a system log. It takes a series of lines. 53 * Each line may have a priority, signified as "<n>" as 54 * the first characters of the line. If this is 55 * not present, a default priority is used. 56 * 57 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 58 * cause it to reread its configuration file. 59 * 60 * Defined Constants: 61 * 62 * MAXLINE -- the maximum line length that can be handled. 63 * DEFUPRI -- the default priority for user messages 64 * DEFSPRI -- the default priority for kernel messages 65 * 66 * Author: Eric Allman 67 * extensive changes by Ralph Campbell 68 * more extensive changes by Eric Allman (again) 69 * Extension to log by program name as well as facility and priority 70 * by Peter da Silva. 71 * -u and -v by Harlan Stenn. 72 * Priority comparison code by Harlan Stenn. 73 */ 74 75#define MAXLINE 1024 /* maximum line length */ 76#define MAXSVLINE 120 /* maximum saved line length */ 77#define DEFUPRI (LOG_USER|LOG_NOTICE) 78#define DEFSPRI (LOG_KERN|LOG_CRIT) 79#define TIMERINTVL 30 /* interval for checking flush, mark */ 80#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 81 82#include <sys/param.h> 83#include <sys/ioctl.h> 84#include <sys/stat.h> 85#include <sys/wait.h> 86#include <sys/socket.h> 87#include <sys/queue.h> 88#include <sys/uio.h> 89#include <sys/un.h> 90#include <sys/time.h> 91#include <sys/resource.h> 92#include <sys/syslimits.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 <utmp.h> 113 114#include "pathnames.h" 115#include "ttymsg.h" 116 117#define SYSLOG_NAMES 118#include <sys/syslog.h> 119 120#ifdef NI_WITHSCOPEID 121static const int withscopeid = NI_WITHSCOPEID; 122#else 123static const int withscopeid; 124#endif 125 126const char *ConfFile = _PATH_LOGCONF; 127const char *PidFile = _PATH_LOGPID; 128const char ctty[] = _PATH_CONSOLE; 129 130#define dprintf if (Debug) printf 131 132#define MAXUNAMES 20 /* maximum number of user names */ 133 134#define MAXFUNIX 20 135 136int nfunix = 1; 137const char *funixn[MAXFUNIX] = { _PATH_LOG }; 138int funix[MAXFUNIX]; 139 140/* 141 * Flags to logmsg(). 142 */ 143 144#define IGN_CONS 0x001 /* don't print on console */ 145#define SYNC_FILE 0x002 /* do fsync on file after printing */ 146#define ADDDATE 0x004 /* add a date to the message */ 147#define MARK 0x008 /* this message is a mark */ 148#define ISKERNEL 0x010 /* kernel generated message */ 149 150/* 151 * This structure represents the files that will have log 152 * copies printed. 153 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 154 * or if f_type if F_PIPE and f_pid > 0. 155 */ 156 157struct filed { 158 struct filed *f_next; /* next in linked list */ 159 short f_type; /* entry type, see below */ 160 short f_file; /* file descriptor */ 161 time_t f_time; /* time this was last written */ 162 char *f_host; /* host from which to recd. */ 163 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 164 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 165#define PRI_LT 0x1 166#define PRI_EQ 0x2 167#define PRI_GT 0x4 168 char *f_program; /* program this applies to */ 169 union { 170 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 171 struct { 172 char f_hname[MAXHOSTNAMELEN]; 173 struct addrinfo *f_addr; 174 175 } f_forw; /* forwarding address */ 176 char f_fname[MAXPATHLEN]; 177 struct { 178 char f_pname[MAXPATHLEN]; 179 pid_t f_pid; 180 } f_pipe; 181 } f_un; 182 char f_prevline[MAXSVLINE]; /* last message logged */ 183 char f_lasttime[16]; /* time of last occurrence */ 184 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 185 int f_prevpri; /* pri of f_prevline */ 186 int f_prevlen; /* length of f_prevline */ 187 int f_prevcount; /* repetition cnt of prevline */ 188 u_int f_repeatcount; /* number of "repeated" msgs */ 189 int f_flags; /* file-specific flags */ 190#define FFLAG_SYNC 0x01 191}; 192 193/* 194 * Queue of about-to-be dead processes we should watch out for. 195 */ 196 197TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 198struct stailhead *deadq_headp; 199 200struct deadq_entry { 201 pid_t dq_pid; 202 int dq_timeout; 203 TAILQ_ENTRY(deadq_entry) dq_entries; 204}; 205 206/* 207 * The timeout to apply to processes waiting on the dead queue. Unit 208 * of measure is `mark intervals', i.e. 20 minutes by default. 209 * Processes on the dead queue will be terminated after that time. 210 */ 211 212#define DQ_TIMO_INIT 2 213 214typedef struct deadq_entry *dq_t; 215 216 217/* 218 * Struct to hold records of network addresses that are allowed to log 219 * to us. 220 */ 221struct allowedpeer { 222 int isnumeric; 223 u_short port; 224 union { 225 struct { 226 struct sockaddr_storage addr; 227 struct sockaddr_storage mask; 228 } numeric; 229 char *name; 230 } u; 231#define a_addr u.numeric.addr 232#define a_mask u.numeric.mask 233#define a_name u.name 234}; 235 236 237/* 238 * Intervals at which we flush out "message repeated" messages, 239 * in seconds after previous message is logged. After each flush, 240 * we move to the next interval until we reach the largest. 241 */ 242int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 243#define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 244#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 245#define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 246 (f)->f_repeatcount = MAXREPEAT; \ 247 } 248 249/* values for f_type */ 250#define F_UNUSED 0 /* unused entry */ 251#define F_FILE 1 /* regular file */ 252#define F_TTY 2 /* terminal */ 253#define F_CONSOLE 3 /* console terminal */ 254#define F_FORW 4 /* remote machine */ 255#define F_USERS 5 /* list of users */ 256#define F_WALL 6 /* everyone logged on */ 257#define F_PIPE 7 /* pipe to program */ 258 259const char *TypeNames[8] = { 260 "UNUSED", "FILE", "TTY", "CONSOLE", 261 "FORW", "USERS", "WALL", "PIPE" 262}; 263 264static struct filed *Files; /* Log files that we write to */ 265static struct filed consfile; /* Console */ 266 267static int Debug; /* debug flag */ 268static int resolve = 1; /* resolve hostname */ 269static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 270static const char *LocalDomain; /* our local domain name */ 271static int *finet; /* Internet datagram socket */ 272static int fklog = -1; /* /dev/klog */ 273static int Initialized; /* set when we have initialized ourselves */ 274static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 275static int MarkSeq; /* mark sequence number */ 276static int SecureMode; /* when true, receive only unix domain socks */ 277#ifdef INET6 278static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 279#else 280static int family = PF_INET; /* protocol family (IPv4 only) */ 281#endif 282static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 283static int use_bootfile; /* log entire bootfile for every kern msg */ 284static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 285 286static char bootfile[MAXLINE+1]; /* booted kernel file */ 287 288struct allowedpeer *AllowedPeers; /* List of allowed peers */ 289static int NumAllowed; /* Number of entries in AllowedPeers */ 290 291static int UniquePriority; /* Only log specified priority? */ 292static int LogFacPri; /* Put facility and priority in log message: */ 293 /* 0=no, 1=numeric, 2=names */ 294static int KeepKernFac; /* Keep remotely logged kernel facility */ 295 296volatile sig_atomic_t MarkSet, WantDie; 297 298static int allowaddr(char *); 299static void cfline(const char *, struct filed *, 300 const char *, const char *); 301static const char *cvthname(struct sockaddr *); 302static void deadq_enter(pid_t, const char *); 303static int deadq_remove(pid_t); 304static int decode(const char *, CODE *); 305static void die(int); 306static void dodie(int); 307static void domark(int); 308static void fprintlog(struct filed *, int, const char *); 309static int *socksetup(int, const char *); 310static void init(int); 311static void logerror(const char *); 312static void logmsg(int, const char *, const char *, int); 313static void log_deadchild(pid_t, int, const char *); 314static void markit(void); 315static int skip_message(const char *, const char *, int); 316static void printline(const char *, char *); 317static void printsys(char *); 318static int p_open(const char *, pid_t *); 319static void readklog(void); 320static void reapchild(int); 321static void usage(void); 322static int validate(struct sockaddr *, const char *); 323static void unmapped(struct sockaddr *); 324static void wallmsg(struct filed *, struct iovec *); 325static int waitdaemon(int, int, int); 326static void timedout(int); 327 328int 329main(int argc, char *argv[]) 330{ 331 int ch, i, fdsrmax = 0, l; 332 struct sockaddr_un sunx, fromunix; 333 struct sockaddr_storage frominet; 334 fd_set *fdsr = NULL; 335 FILE *fp; 336 char line[MAXLINE + 1]; 337 const char *bindhostname, *hname; 338 struct timeval tv, *tvp; 339 struct sigaction sact; 340 sigset_t mask; 341 pid_t ppid = 1; 342 socklen_t len; 343 344 bindhostname = NULL; 345 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 346 switch (ch) { 347 case '4': 348 family = PF_INET; 349 break; 350#ifdef INET6 351 case '6': 352 family = PF_INET6; 353 break; 354#endif 355 case 'A': 356 send_to_all++; 357 break; 358 case 'a': /* allow specific network addresses only */ 359 if (allowaddr(optarg) == -1) 360 usage(); 361 break; 362 case 'b': 363 bindhostname = optarg; 364 break; 365 case 'c': 366 no_compress++; 367 break; 368 case 'd': /* debug */ 369 Debug++; 370 break; 371 case 'f': /* configuration file */ 372 ConfFile = optarg; 373 break; 374 case 'k': /* keep remote kern fac */ 375 KeepKernFac = 1; 376 break; 377 case 'l': 378 if (strlen(optarg) >= sizeof(sunx.sun_path)) 379 errx(1, "%s path too long, exiting", optarg); 380 if (nfunix < MAXFUNIX) 381 funixn[nfunix++] = optarg; 382 else 383 warnx("out of descriptors, ignoring %s", 384 optarg); 385 break; 386 case 'm': /* mark interval */ 387 MarkInterval = atoi(optarg) * 60; 388 break; 389 case 'n': 390 resolve = 0; 391 break; 392 case 'o': 393 use_bootfile = 1; 394 break; 395 case 'p': /* path */ 396 if (strlen(optarg) >= sizeof(sunx.sun_path)) 397 errx(1, "%s path too long, exiting", optarg); 398 funixn[0] = optarg; 399 break; 400 case 'P': /* path for alt. PID */ 401 PidFile = optarg; 402 break; 403 case 's': /* no network mode */ 404 SecureMode++; 405 break; 406 case 'u': /* only log specified priority */ 407 UniquePriority++; 408 break; 409 case 'v': /* log facility and priority */ 410 LogFacPri++; 411 break; 412 default: 413 usage(); 414 } 415 if ((argc -= optind) != 0) 416 usage(); 417 418 if (!Debug) { 419 ppid = waitdaemon(0, 0, 30); 420 if (ppid < 0) 421 err(1, "could not become daemon"); 422 } else { 423 setlinebuf(stdout); 424 } 425 426 if (NumAllowed) 427 endservent(); 428 429 consfile.f_type = F_CONSOLE; 430 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 431 sizeof(consfile.f_un.f_fname)); 432 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 433 (void)signal(SIGTERM, dodie); 434 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 435 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 436 /* 437 * We don't want the SIGCHLD and SIGHUP handlers to interfere 438 * with each other; they are likely candidates for being called 439 * simultaneously (SIGHUP closes pipe descriptor, process dies, 440 * SIGCHLD happens). 441 */ 442 sigemptyset(&mask); 443 sigaddset(&mask, SIGHUP); 444 sact.sa_handler = reapchild; 445 sact.sa_mask = mask; 446 sact.sa_flags = SA_RESTART; 447 (void)sigaction(SIGCHLD, &sact, NULL); 448 (void)signal(SIGALRM, domark); 449 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 450 (void)alarm(TIMERINTVL); 451 452 TAILQ_INIT(&deadq_head); 453 454#ifndef SUN_LEN 455#define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 456#endif 457 for (i = 0; i < nfunix; i++) { 458 (void)unlink(funixn[i]); 459 memset(&sunx, 0, sizeof(sunx)); 460 sunx.sun_family = AF_UNIX; 461 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 462 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 463 if (funix[i] < 0 || 464 bind(funix[i], (struct sockaddr *)&sunx, 465 SUN_LEN(&sunx)) < 0 || 466 chmod(funixn[i], 0666) < 0) { 467 (void)snprintf(line, sizeof line, 468 "cannot create %s", funixn[i]); 469 logerror(line); 470 dprintf("cannot create %s (%d)\n", funixn[i], errno); 471 if (i == 0) 472 die(0); 473 } 474 } 475 if (SecureMode <= 1) 476 finet = socksetup(family, bindhostname); 477 478 if (finet) { 479 if (SecureMode) { 480 for (i = 0; i < *finet; i++) { 481 if (shutdown(finet[i+1], SHUT_RD) < 0) { 482 logerror("shutdown"); 483 if (!Debug) 484 die(0); 485 } 486 } 487 } else { 488 dprintf("listening on inet and/or inet6 socket\n"); 489 } 490 dprintf("sending on inet and/or inet6 socket\n"); 491 } 492 493 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 494 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 495 fklog = -1; 496 if (fklog < 0) 497 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 498 499 /* tuck my process id away */ 500 fp = fopen(PidFile, "w"); 501 if (fp != NULL) { 502 fprintf(fp, "%d\n", getpid()); 503 (void)fclose(fp); 504 } 505 506 dprintf("off & running....\n"); 507 508 init(0); 509 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 510 sigemptyset(&mask); 511 sigaddset(&mask, SIGCHLD); 512 sact.sa_handler = init; 513 sact.sa_mask = mask; 514 sact.sa_flags = SA_RESTART; 515 (void)sigaction(SIGHUP, &sact, NULL); 516 517 tvp = &tv; 518 tv.tv_sec = tv.tv_usec = 0; 519 520 if (fklog != -1 && fklog > fdsrmax) 521 fdsrmax = fklog; 522 if (finet && !SecureMode) { 523 for (i = 0; i < *finet; i++) { 524 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 525 fdsrmax = finet[i+1]; 526 } 527 } 528 for (i = 0; i < nfunix; i++) { 529 if (funix[i] != -1 && funix[i] > fdsrmax) 530 fdsrmax = funix[i]; 531 } 532 533 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 534 sizeof(fd_mask)); 535 if (fdsr == NULL) 536 errx(1, "calloc fd_set"); 537 538 for (;;) { 539 if (MarkSet) 540 markit(); 541 if (WantDie) 542 die(WantDie); 543 544 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 545 sizeof(fd_mask)); 546 547 if (fklog != -1) 548 FD_SET(fklog, fdsr); 549 if (finet && !SecureMode) { 550 for (i = 0; i < *finet; i++) { 551 if (finet[i+1] != -1) 552 FD_SET(finet[i+1], fdsr); 553 } 554 } 555 for (i = 0; i < nfunix; i++) { 556 if (funix[i] != -1) 557 FD_SET(funix[i], fdsr); 558 } 559 560 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 561 switch (i) { 562 case 0: 563 if (tvp) { 564 tvp = NULL; 565 if (ppid != 1) 566 kill(ppid, SIGALRM); 567 } 568 continue; 569 case -1: 570 if (errno != EINTR) 571 logerror("select"); 572 continue; 573 } 574 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 575 readklog(); 576 if (finet && !SecureMode) { 577 for (i = 0; i < *finet; i++) { 578 if (FD_ISSET(finet[i+1], fdsr)) { 579 len = sizeof(frominet); 580 l = recvfrom(finet[i+1], line, MAXLINE, 581 0, (struct sockaddr *)&frominet, 582 &len); 583 if (l > 0) { 584 line[l] = '\0'; 585 hname = cvthname((struct sockaddr *)&frominet); 586 unmapped((struct sockaddr *)&frominet); 587 if (validate((struct sockaddr *)&frominet, hname)) 588 printline(hname, line); 589 } else if (l < 0 && errno != EINTR) 590 logerror("recvfrom inet"); 591 } 592 } 593 } 594 for (i = 0; i < nfunix; i++) { 595 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 596 len = sizeof(fromunix); 597 l = recvfrom(funix[i], line, MAXLINE, 0, 598 (struct sockaddr *)&fromunix, &len); 599 if (l > 0) { 600 line[l] = '\0'; 601 printline(LocalHostName, line); 602 } else if (l < 0 && errno != EINTR) 603 logerror("recvfrom unix"); 604 } 605 } 606 } 607 if (fdsr) 608 free(fdsr); 609} 610 611static void 612unmapped(struct sockaddr *sa) 613{ 614 struct sockaddr_in6 *sin6; 615 struct sockaddr_in sin4; 616 617 if (sa->sa_family != AF_INET6) 618 return; 619 if (sa->sa_len != sizeof(struct sockaddr_in6) || 620 sizeof(sin4) > sa->sa_len) 621 return; 622 sin6 = (struct sockaddr_in6 *)sa; 623 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 624 return; 625 626 memset(&sin4, 0, sizeof(sin4)); 627 sin4.sin_family = AF_INET; 628 sin4.sin_len = sizeof(struct sockaddr_in); 629 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 630 sizeof(sin4.sin_addr)); 631 sin4.sin_port = sin6->sin6_port; 632 633 memcpy(sa, &sin4, sin4.sin_len); 634} 635 636static void 637usage(void) 638{ 639 640 fprintf(stderr, "%s\n%s\n%s\n%s\n", 641 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 642 " [-b bind address] [-f config_file]", 643 " [-l log_socket] [-m mark_interval]", 644 " [-P pid_file] [-p log_socket]"); 645 exit(1); 646} 647 648/* 649 * Take a raw input line, decode the message, and print the message 650 * on the appropriate log files. 651 */ 652static void 653printline(const char *hname, char *msg) 654{ 655 char *p, *q; 656 long n; 657 int c, pri; 658 char line[MAXLINE + 1]; 659 660 /* test for special codes */ 661 p = msg; 662 pri = DEFUPRI; 663 if (*p == '<') { 664 errno = 0; 665 n = strtol(p + 1, &q, 10); 666 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 667 p = q + 1; 668 pri = n; 669 } 670 } 671 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 672 pri = DEFUPRI; 673 674 /* 675 * Don't allow users to log kernel messages. 676 * NOTE: since LOG_KERN == 0 this will also match 677 * messages with no facility specified. 678 */ 679 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 680 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 681 682 q = line; 683 684 while ((c = (unsigned char)*p++) != '\0' && 685 q < &line[sizeof(line) - 4]) { 686 if ((c & 0x80) && c < 0xA0) { 687 c &= 0x7F; 688 *q++ = 'M'; 689 *q++ = '-'; 690 } 691 if (isascii(c) && iscntrl(c)) { 692 if (c == '\n') { 693 *q++ = ' '; 694 } else if (c == '\t') { 695 *q++ = '\t'; 696 } else { 697 *q++ = '^'; 698 *q++ = c ^ 0100; 699 } 700 } else { 701 *q++ = c; 702 } 703 } 704 *q = '\0'; 705 706 logmsg(pri, line, hname, 0); 707} 708 709/* 710 * Read /dev/klog while data are available, split into lines. 711 */ 712static void 713readklog(void) 714{ 715 char *p, *q, line[MAXLINE + 1]; 716 int len, i; 717 718 len = 0; 719 for (;;) { 720 i = read(fklog, line + len, MAXLINE - 1 - len); 721 if (i > 0) { 722 line[i + len] = '\0'; 723 } else { 724 if (i < 0 && errno != EINTR && errno != EAGAIN) { 725 logerror("klog"); 726 fklog = -1; 727 } 728 break; 729 } 730 731 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 732 *q = '\0'; 733 printsys(p); 734 } 735 len = strlen(p); 736 if (len >= MAXLINE - 1) { 737 printsys(p); 738 len = 0; 739 } 740 if (len > 0) 741 memmove(line, p, len + 1); 742 } 743 if (len > 0) 744 printsys(line); 745} 746 747/* 748 * Take a raw input line from /dev/klog, format similar to syslog(). 749 */ 750static void 751printsys(char *msg) 752{ 753 char *p, *q; 754 long n; 755 int flags, isprintf, pri; 756 757 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 758 p = msg; 759 pri = DEFSPRI; 760 isprintf = 1; 761 if (*p == '<') { 762 errno = 0; 763 n = strtol(p + 1, &q, 10); 764 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 765 p = q + 1; 766 pri = n; 767 isprintf = 0; 768 } 769 } 770 /* 771 * Kernel printf's and LOG_CONSOLE messages have been displayed 772 * on the console already. 773 */ 774 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 775 flags |= IGN_CONS; 776 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 777 pri = DEFSPRI; 778 logmsg(pri, p, LocalHostName, flags); 779} 780 781static time_t now; 782 783/* 784 * Match a program or host name against a specification. 785 * Return a non-0 value if the message must be ignored 786 * based on the specification. 787 */ 788static int 789skip_message(const char *name, const char *spec, int checkcase) { 790 const char *s; 791 char prev, next; 792 int exclude = 0; 793 /* Behaviour on explicit match */ 794 795 if (spec == NULL) 796 return 0; 797 switch (*spec) { 798 case '-': 799 exclude = 1; 800 /*FALLTHROUGH*/ 801 case '+': 802 spec++; 803 break; 804 default: 805 break; 806 } 807 if (checkcase) 808 s = strstr (spec, name); 809 else 810 s = strcasestr (spec, name); 811 812 if (s != NULL) { 813 prev = (s == spec ? ',' : *(s - 1)); 814 next = *(s + strlen (name)); 815 816 if (prev == ',' && (next == '\0' || next == ',')) 817 /* Explicit match: skip iff the spec is an 818 exclusive one. */ 819 return exclude; 820 } 821 822 /* No explicit match for this name: skip the message iff 823 the spec is an inclusive one. */ 824 return !exclude; 825} 826 827/* 828 * Log a message to the appropriate log files, users, etc. based on 829 * the priority. 830 */ 831static void 832logmsg(int pri, const char *msg, const char *from, int flags) 833{ 834 struct filed *f; 835 int i, fac, msglen, omask, prilev; 836 const char *timestamp; 837 char prog[NAME_MAX+1]; 838 char buf[MAXLINE+1]; 839 840 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 841 pri, flags, from, msg); 842 843 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 844 845 /* 846 * Check to see if msg looks non-standard. 847 */ 848 msglen = strlen(msg); 849 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 850 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 851 flags |= ADDDATE; 852 853 (void)time(&now); 854 if (flags & ADDDATE) { 855 timestamp = ctime(&now) + 4; 856 } else { 857 timestamp = msg; 858 msg += 16; 859 msglen -= 16; 860 } 861 862 /* skip leading blanks */ 863 while (isspace(*msg)) { 864 msg++; 865 msglen--; 866 } 867 868 /* extract facility and priority level */ 869 if (flags & MARK) 870 fac = LOG_NFACILITIES; 871 else 872 fac = LOG_FAC(pri); 873 prilev = LOG_PRI(pri); 874 875 /* extract program name */ 876 for (i = 0; i < NAME_MAX; i++) { 877 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 878 msg[i] == '/') 879 break; 880 prog[i] = msg[i]; 881 } 882 prog[i] = 0; 883 884 /* add kernel prefix for kernel messages */ 885 if (flags & ISKERNEL) { 886 snprintf(buf, sizeof(buf), "%s: %s", 887 use_bootfile ? bootfile : "kernel", msg); 888 msg = buf; 889 msglen = strlen(buf); 890 } 891 892 /* log the message to the particular outputs */ 893 if (!Initialized) { 894 f = &consfile; 895 f->f_file = open(ctty, O_WRONLY, 0); 896 897 if (f->f_file >= 0) { 898 (void)strlcpy(f->f_lasttime, timestamp, 899 sizeof(f->f_lasttime)); 900 fprintlog(f, flags, msg); 901 (void)close(f->f_file); 902 } 903 (void)sigsetmask(omask); 904 return; 905 } 906 for (f = Files; f; f = f->f_next) { 907 /* skip messages that are incorrect priority */ 908 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 909 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 910 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 911 ) 912 || f->f_pmask[fac] == INTERNAL_NOPRI) 913 continue; 914 915 /* skip messages with the incorrect hostname */ 916 if (skip_message(from, f->f_host, 0)) 917 continue; 918 919 /* skip messages with the incorrect program name */ 920 if (skip_message(prog, f->f_program, 1)) 921 continue; 922 923 /* skip message to console if it has already been printed */ 924 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 925 continue; 926 927 /* don't output marks to recently written files */ 928 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 929 continue; 930 931 /* 932 * suppress duplicate lines to this file 933 */ 934 if (no_compress - (f->f_type != F_PIPE) < 1 && 935 (flags & MARK) == 0 && msglen == f->f_prevlen && 936 !strcmp(msg, f->f_prevline) && 937 !strcasecmp(from, f->f_prevhost)) { 938 (void)strlcpy(f->f_lasttime, timestamp, 939 sizeof(f->f_lasttime)); 940 f->f_prevcount++; 941 dprintf("msg repeated %d times, %ld sec of %d\n", 942 f->f_prevcount, (long)(now - f->f_time), 943 repeatinterval[f->f_repeatcount]); 944 /* 945 * If domark would have logged this by now, 946 * flush it now (so we don't hold isolated messages), 947 * but back off so we'll flush less often 948 * in the future. 949 */ 950 if (now > REPEATTIME(f)) { 951 fprintlog(f, flags, (char *)NULL); 952 BACKOFF(f); 953 } 954 } else { 955 /* new line, save it */ 956 if (f->f_prevcount) 957 fprintlog(f, 0, (char *)NULL); 958 f->f_repeatcount = 0; 959 f->f_prevpri = pri; 960 (void)strlcpy(f->f_lasttime, timestamp, 961 sizeof(f->f_lasttime)); 962 (void)strlcpy(f->f_prevhost, from, 963 sizeof(f->f_prevhost)); 964 if (msglen < MAXSVLINE) { 965 f->f_prevlen = msglen; 966 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 967 fprintlog(f, flags, (char *)NULL); 968 } else { 969 f->f_prevline[0] = 0; 970 f->f_prevlen = 0; 971 fprintlog(f, flags, msg); 972 } 973 } 974 } 975 (void)sigsetmask(omask); 976} 977 978static void 979fprintlog(struct filed *f, int flags, const char *msg) 980{ 981 struct iovec iov[7]; 982 struct iovec *v; 983 struct addrinfo *r; 984 int i, l, lsent = 0; 985 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 986 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 987 const char *msgret; 988 989 v = iov; 990 if (f->f_type == F_WALL) { 991 v->iov_base = greetings; 992 v->iov_len = snprintf(greetings, sizeof greetings, 993 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 994 f->f_prevhost, ctime(&now)); 995 if (v->iov_len > 0) 996 v++; 997 v->iov_base = nul; 998 v->iov_len = 0; 999 v++; 1000 } else { 1001 v->iov_base = f->f_lasttime; 1002 v->iov_len = 15; 1003 v++; 1004 v->iov_base = space; 1005 v->iov_len = 1; 1006 v++; 1007 } 1008 1009 if (LogFacPri) { 1010 static char fp_buf[30]; /* Hollow laugh */ 1011 int fac = f->f_prevpri & LOG_FACMASK; 1012 int pri = LOG_PRI(f->f_prevpri); 1013 const char *f_s = NULL; 1014 char f_n[5]; /* Hollow laugh */ 1015 const char *p_s = NULL; 1016 char p_n[5]; /* Hollow laugh */ 1017 1018 if (LogFacPri > 1) { 1019 CODE *c; 1020 1021 for (c = facilitynames; c->c_name; c++) { 1022 if (c->c_val == fac) { 1023 f_s = c->c_name; 1024 break; 1025 } 1026 } 1027 for (c = prioritynames; c->c_name; c++) { 1028 if (c->c_val == pri) { 1029 p_s = c->c_name; 1030 break; 1031 } 1032 } 1033 } 1034 if (!f_s) { 1035 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1036 f_s = f_n; 1037 } 1038 if (!p_s) { 1039 snprintf(p_n, sizeof p_n, "%d", pri); 1040 p_s = p_n; 1041 } 1042 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1043 v->iov_base = fp_buf; 1044 v->iov_len = strlen(fp_buf); 1045 } else { 1046 v->iov_base = nul; 1047 v->iov_len = 0; 1048 } 1049 v++; 1050 1051 v->iov_base = f->f_prevhost; 1052 v->iov_len = strlen(v->iov_base); 1053 v++; 1054 v->iov_base = space; 1055 v->iov_len = 1; 1056 v++; 1057 1058 if (msg) { 1059 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1060 if (wmsg == NULL) { 1061 logerror("strdup"); 1062 exit(1); 1063 } 1064 v->iov_base = wmsg; 1065 v->iov_len = strlen(msg); 1066 } else if (f->f_prevcount > 1) { 1067 v->iov_base = repbuf; 1068 v->iov_len = snprintf(repbuf, sizeof repbuf, 1069 "last message repeated %d times", f->f_prevcount); 1070 } else { 1071 v->iov_base = f->f_prevline; 1072 v->iov_len = f->f_prevlen; 1073 } 1074 v++; 1075 1076 dprintf("Logging to %s", TypeNames[f->f_type]); 1077 f->f_time = now; 1078 1079 switch (f->f_type) { 1080 case F_UNUSED: 1081 dprintf("\n"); 1082 break; 1083 1084 case F_FORW: 1085 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1086 /* check for local vs remote messages */ 1087 if (strcasecmp(f->f_prevhost, LocalHostName)) 1088 l = snprintf(line, sizeof line - 1, 1089 "<%d>%.15s Forwarded from %s: %s", 1090 f->f_prevpri, (char *)iov[0].iov_base, 1091 f->f_prevhost, (char *)iov[5].iov_base); 1092 else 1093 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1094 f->f_prevpri, (char *)iov[0].iov_base, 1095 (char *)iov[5].iov_base); 1096 if (l < 0) 1097 l = 0; 1098 else if (l > MAXLINE) 1099 l = MAXLINE; 1100 1101 if (finet) { 1102 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1103 for (i = 0; i < *finet; i++) { 1104#if 0 1105 /* 1106 * should we check AF first, or just 1107 * trial and error? FWD 1108 */ 1109 if (r->ai_family == 1110 address_family_of(finet[i+1])) 1111#endif 1112 lsent = sendto(finet[i+1], line, l, 0, 1113 r->ai_addr, r->ai_addrlen); 1114 if (lsent == l) 1115 break; 1116 } 1117 if (lsent == l && !send_to_all) 1118 break; 1119 } 1120 dprintf("lsent/l: %d/%d\n", lsent, l); 1121 if (lsent != l) { 1122 int e = errno; 1123 logerror("sendto"); 1124 errno = e; 1125 switch (errno) { 1126 case EHOSTUNREACH: 1127 case EHOSTDOWN: 1128 break; 1129 /* case EBADF: */ 1130 /* case EACCES: */ 1131 /* case ENOTSOCK: */ 1132 /* case EFAULT: */ 1133 /* case EMSGSIZE: */ 1134 /* case EAGAIN: */ 1135 /* case ENOBUFS: */ 1136 /* case ECONNREFUSED: */ 1137 default: 1138 dprintf("removing entry\n"); 1139 f->f_type = F_UNUSED; 1140 break; 1141 } 1142 } 1143 } 1144 break; 1145 1146 case F_FILE: 1147 dprintf(" %s\n", f->f_un.f_fname); 1148 v->iov_base = lf; 1149 v->iov_len = 1; 1150 if (writev(f->f_file, iov, 7) < 0) { 1151 int e = errno; 1152 (void)close(f->f_file); 1153 f->f_type = F_UNUSED; 1154 errno = e; 1155 logerror(f->f_un.f_fname); 1156 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) 1157 (void)fsync(f->f_file); 1158 break; 1159 1160 case F_PIPE: 1161 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1162 v->iov_base = lf; 1163 v->iov_len = 1; 1164 if (f->f_un.f_pipe.f_pid == 0) { 1165 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1166 &f->f_un.f_pipe.f_pid)) < 0) { 1167 f->f_type = F_UNUSED; 1168 logerror(f->f_un.f_pipe.f_pname); 1169 break; 1170 } 1171 } 1172 if (writev(f->f_file, iov, 7) < 0) { 1173 int e = errno; 1174 (void)close(f->f_file); 1175 if (f->f_un.f_pipe.f_pid > 0) 1176 deadq_enter(f->f_un.f_pipe.f_pid, 1177 f->f_un.f_pipe.f_pname); 1178 f->f_un.f_pipe.f_pid = 0; 1179 errno = e; 1180 logerror(f->f_un.f_pipe.f_pname); 1181 } 1182 break; 1183 1184 case F_CONSOLE: 1185 if (flags & IGN_CONS) { 1186 dprintf(" (ignored)\n"); 1187 break; 1188 } 1189 /* FALLTHROUGH */ 1190 1191 case F_TTY: 1192 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1193 v->iov_base = crlf; 1194 v->iov_len = 2; 1195 1196 errno = 0; /* ttymsg() only sometimes returns an errno */ 1197 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1198 f->f_type = F_UNUSED; 1199 logerror(msgret); 1200 } 1201 break; 1202 1203 case F_USERS: 1204 case F_WALL: 1205 dprintf("\n"); 1206 v->iov_base = crlf; 1207 v->iov_len = 2; 1208 wallmsg(f, iov); 1209 break; 1210 } 1211 f->f_prevcount = 0; 1212 if (msg) 1213 free(wmsg); 1214} 1215 1216/* 1217 * WALLMSG -- Write a message to the world at large 1218 * 1219 * Write the specified message to either the entire 1220 * world, or a list of approved users. 1221 */ 1222static void 1223wallmsg(struct filed *f, struct iovec *iov) 1224{ 1225 static int reenter; /* avoid calling ourselves */ 1226 FILE *uf; 1227 struct utmp ut; 1228 int i; 1229 const char *p; 1230 char line[sizeof(ut.ut_line) + 1]; 1231 1232 if (reenter++) 1233 return; 1234 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1235 logerror(_PATH_UTMP); 1236 reenter = 0; 1237 return; 1238 } 1239 /* NOSTRICT */ 1240 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1241 if (ut.ut_name[0] == '\0') 1242 continue; 1243 /* We must use strncpy since ut_* may not be NUL terminated. */ 1244 strncpy(line, ut.ut_line, sizeof(line) - 1); 1245 line[sizeof(line) - 1] = '\0'; 1246 if (f->f_type == F_WALL) { 1247 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1248 errno = 0; /* already in msg */ 1249 logerror(p); 1250 } 1251 continue; 1252 } 1253 /* should we send the message to this user? */ 1254 for (i = 0; i < MAXUNAMES; i++) { 1255 if (!f->f_un.f_uname[i][0]) 1256 break; 1257 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1258 UT_NAMESIZE)) { 1259 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1260 != NULL) { 1261 errno = 0; /* already in msg */ 1262 logerror(p); 1263 } 1264 break; 1265 } 1266 } 1267 } 1268 (void)fclose(uf); 1269 reenter = 0; 1270} 1271 1272static void 1273reapchild(int signo __unused) 1274{ 1275 int status; 1276 pid_t pid; 1277 struct filed *f; 1278 1279 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1280 if (!Initialized) 1281 /* Don't tell while we are initting. */ 1282 continue; 1283 1284 /* First, look if it's a process from the dead queue. */ 1285 if (deadq_remove(pid)) 1286 goto oncemore; 1287 1288 /* Now, look in list of active processes. */ 1289 for (f = Files; f; f = f->f_next) 1290 if (f->f_type == F_PIPE && 1291 f->f_un.f_pipe.f_pid == pid) { 1292 (void)close(f->f_file); 1293 f->f_un.f_pipe.f_pid = 0; 1294 log_deadchild(pid, status, 1295 f->f_un.f_pipe.f_pname); 1296 break; 1297 } 1298 oncemore: 1299 continue; 1300 } 1301} 1302 1303/* 1304 * Return a printable representation of a host address. 1305 */ 1306static const char * 1307cvthname(struct sockaddr *f) 1308{ 1309 int error, hl; 1310 sigset_t omask, nmask; 1311 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1312 1313 error = getnameinfo((struct sockaddr *)f, 1314 ((struct sockaddr *)f)->sa_len, 1315 ip, sizeof ip, NULL, 0, 1316 NI_NUMERICHOST | withscopeid); 1317 dprintf("cvthname(%s)\n", ip); 1318 1319 if (error) { 1320 dprintf("Malformed from address %s\n", gai_strerror(error)); 1321 return ("???"); 1322 } 1323 if (!resolve) 1324 return (ip); 1325 1326 sigemptyset(&nmask); 1327 sigaddset(&nmask, SIGHUP); 1328 sigprocmask(SIG_BLOCK, &nmask, &omask); 1329 error = getnameinfo((struct sockaddr *)f, 1330 ((struct sockaddr *)f)->sa_len, 1331 hname, sizeof hname, NULL, 0, 1332 NI_NAMEREQD | withscopeid); 1333 sigprocmask(SIG_SETMASK, &omask, NULL); 1334 if (error) { 1335 dprintf("Host name for your address (%s) unknown\n", ip); 1336 return (ip); 1337 } 1338 hl = strlen(hname); 1339 if (hl > 0 && hname[hl-1] == '.') 1340 hname[--hl] = '\0'; 1341 trimdomain(hname, hl); 1342 return (hname); 1343} 1344 1345static void 1346dodie(int signo) 1347{ 1348 1349 WantDie = signo; 1350} 1351 1352static void 1353domark(int signo __unused) 1354{ 1355 1356 MarkSet = 1; 1357} 1358 1359/* 1360 * Print syslogd errors some place. 1361 */ 1362static void 1363logerror(const char *type) 1364{ 1365 char buf[512]; 1366 static int recursed = 0; 1367 1368 /* If there's an error while trying to log an error, give up. */ 1369 if (recursed) 1370 return; 1371 recursed++; 1372 if (errno) 1373 (void)snprintf(buf, 1374 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1375 else 1376 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1377 errno = 0; 1378 dprintf("%s\n", buf); 1379 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1380 recursed--; 1381} 1382 1383static void 1384die(int signo) 1385{ 1386 struct filed *f; 1387 int was_initialized; 1388 char buf[100]; 1389 int i; 1390 1391 was_initialized = Initialized; 1392 Initialized = 0; /* Don't log SIGCHLDs. */ 1393 for (f = Files; f != NULL; f = f->f_next) { 1394 /* flush any pending output */ 1395 if (f->f_prevcount) 1396 fprintlog(f, 0, (char *)NULL); 1397 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1398 (void)close(f->f_file); 1399 f->f_un.f_pipe.f_pid = 0; 1400 } 1401 } 1402 Initialized = was_initialized; 1403 if (signo) { 1404 dprintf("syslogd: exiting on signal %d\n", signo); 1405 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1406 errno = 0; 1407 logerror(buf); 1408 } 1409 for (i = 0; i < nfunix; i++) 1410 if (funixn[i] && funix[i] != -1) 1411 (void)unlink(funixn[i]); 1412 exit(1); 1413} 1414 1415/* 1416 * INIT -- Initialize syslogd from configuration table 1417 */ 1418static void 1419init(int signo) 1420{ 1421 int i; 1422 FILE *cf; 1423 struct filed *f, *next, **nextp; 1424 char *p; 1425 char cline[LINE_MAX]; 1426 char prog[NAME_MAX+1]; 1427 char host[MAXHOSTNAMELEN]; 1428 char oldLocalHostName[MAXHOSTNAMELEN]; 1429 char hostMsg[2*MAXHOSTNAMELEN+40]; 1430 char bootfileMsg[LINE_MAX]; 1431 1432 dprintf("init\n"); 1433 1434 /* 1435 * Load hostname (may have changed). 1436 */ 1437 if (signo != 0) 1438 (void)strlcpy(oldLocalHostName, LocalHostName, 1439 sizeof(oldLocalHostName)); 1440 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1441 err(EX_OSERR, "gethostname() failed"); 1442 if ((p = strchr(LocalHostName, '.')) != NULL) { 1443 *p++ = '\0'; 1444 LocalDomain = p; 1445 } else { 1446 LocalDomain = ""; 1447 } 1448 1449 /* 1450 * Close all open log files. 1451 */ 1452 Initialized = 0; 1453 for (f = Files; f != NULL; f = next) { 1454 /* flush any pending output */ 1455 if (f->f_prevcount) 1456 fprintlog(f, 0, (char *)NULL); 1457 1458 switch (f->f_type) { 1459 case F_FILE: 1460 case F_FORW: 1461 case F_CONSOLE: 1462 case F_TTY: 1463 (void)close(f->f_file); 1464 break; 1465 case F_PIPE: 1466 if (f->f_un.f_pipe.f_pid > 0) { 1467 (void)close(f->f_file); 1468 deadq_enter(f->f_un.f_pipe.f_pid, 1469 f->f_un.f_pipe.f_pname); 1470 } 1471 f->f_un.f_pipe.f_pid = 0; 1472 break; 1473 } 1474 next = f->f_next; 1475 if (f->f_program) free(f->f_program); 1476 if (f->f_host) free(f->f_host); 1477 free((char *)f); 1478 } 1479 Files = NULL; 1480 nextp = &Files; 1481 1482 /* open the configuration file */ 1483 if ((cf = fopen(ConfFile, "r")) == NULL) { 1484 dprintf("cannot open %s\n", ConfFile); 1485 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1486 if (*nextp == NULL) { 1487 logerror("calloc"); 1488 exit(1); 1489 } 1490 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1491 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1492 if ((*nextp)->f_next == NULL) { 1493 logerror("calloc"); 1494 exit(1); 1495 } 1496 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1497 Initialized = 1; 1498 return; 1499 } 1500 1501 /* 1502 * Foreach line in the conf table, open that file. 1503 */ 1504 f = NULL; 1505 (void)strlcpy(host, "*", sizeof(host)); 1506 (void)strlcpy(prog, "*", sizeof(prog)); 1507 while (fgets(cline, sizeof(cline), cf) != NULL) { 1508 /* 1509 * check for end-of-section, comments, strip off trailing 1510 * spaces and newline character. #!prog is treated specially: 1511 * following lines apply only to that program. 1512 */ 1513 for (p = cline; isspace(*p); ++p) 1514 continue; 1515 if (*p == 0) 1516 continue; 1517 if (*p == '#') { 1518 p++; 1519 if (*p != '!' && *p != '+' && *p != '-') 1520 continue; 1521 } 1522 if (*p == '+' || *p == '-') { 1523 host[0] = *p++; 1524 while (isspace(*p)) 1525 p++; 1526 if ((!*p) || (*p == '*')) { 1527 (void)strlcpy(host, "*", sizeof(host)); 1528 continue; 1529 } 1530 if (*p == '@') 1531 p = LocalHostName; 1532 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1533 if (!isalnum(*p) && *p != '.' && *p != '-' 1534 && *p != ',') 1535 break; 1536 host[i] = *p++; 1537 } 1538 host[i] = '\0'; 1539 continue; 1540 } 1541 if (*p == '!') { 1542 p++; 1543 while (isspace(*p)) p++; 1544 if ((!*p) || (*p == '*')) { 1545 (void)strlcpy(prog, "*", sizeof(prog)); 1546 continue; 1547 } 1548 for (i = 0; i < NAME_MAX; i++) { 1549 if (!isprint(p[i])) 1550 break; 1551 prog[i] = p[i]; 1552 } 1553 prog[i] = 0; 1554 continue; 1555 } 1556 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1557 cline[i] = '\0'; 1558 f = (struct filed *)calloc(1, sizeof(*f)); 1559 if (f == NULL) { 1560 logerror("calloc"); 1561 exit(1); 1562 } 1563 *nextp = f; 1564 nextp = &f->f_next; 1565 cfline(cline, f, prog, host); 1566 } 1567 1568 /* close the configuration file */ 1569 (void)fclose(cf); 1570 1571 Initialized = 1; 1572 1573 if (Debug) { 1574 for (f = Files; f; f = f->f_next) { 1575 for (i = 0; i <= LOG_NFACILITIES; i++) 1576 if (f->f_pmask[i] == INTERNAL_NOPRI) 1577 printf("X "); 1578 else 1579 printf("%d ", f->f_pmask[i]); 1580 printf("%s: ", TypeNames[f->f_type]); 1581 switch (f->f_type) { 1582 case F_FILE: 1583 printf("%s", f->f_un.f_fname); 1584 break; 1585 1586 case F_CONSOLE: 1587 case F_TTY: 1588 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1589 break; 1590 1591 case F_FORW: 1592 printf("%s", f->f_un.f_forw.f_hname); 1593 break; 1594 1595 case F_PIPE: 1596 printf("%s", f->f_un.f_pipe.f_pname); 1597 break; 1598 1599 case F_USERS: 1600 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1601 printf("%s, ", f->f_un.f_uname[i]); 1602 break; 1603 } 1604 if (f->f_program) 1605 printf(" (%s)", f->f_program); 1606 printf("\n"); 1607 } 1608 } 1609 1610 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1611 dprintf("syslogd: restarted\n"); 1612 /* 1613 * Log a change in hostname, but only on a restart. 1614 */ 1615 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1616 (void)snprintf(hostMsg, sizeof(hostMsg), 1617 "syslogd: hostname changed, \"%s\" to \"%s\"", 1618 oldLocalHostName, LocalHostName); 1619 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1620 dprintf("%s\n", hostMsg); 1621 } 1622 /* 1623 * Log the kernel boot file if we aren't going to use it as 1624 * the prefix, and if this is *not* a restart. 1625 */ 1626 if (signo == 0 && !use_bootfile) { 1627 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1628 "syslogd: kernel boot file is %s", bootfile); 1629 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1630 dprintf("%s\n", bootfileMsg); 1631 } 1632} 1633 1634/* 1635 * Crack a configuration file line 1636 */ 1637static void 1638cfline(const char *line, struct filed *f, const char *prog, const char *host) 1639{ 1640 struct addrinfo hints, *res; 1641 int error, i, pri, syncfile; 1642 const char *p, *q; 1643 char *bp; 1644 char buf[MAXLINE], ebuf[100]; 1645 1646 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1647 1648 errno = 0; /* keep strerror() stuff out of logerror messages */ 1649 1650 /* clear out file entry */ 1651 memset(f, 0, sizeof(*f)); 1652 for (i = 0; i <= LOG_NFACILITIES; i++) 1653 f->f_pmask[i] = INTERNAL_NOPRI; 1654 1655 /* save hostname if any */ 1656 if (host && *host == '*') 1657 host = NULL; 1658 if (host) { 1659 int hl; 1660 1661 f->f_host = strdup(host); 1662 if (f->f_host == NULL) { 1663 logerror("strdup"); 1664 exit(1); 1665 } 1666 hl = strlen(f->f_host); 1667 if (hl > 0 && f->f_host[hl-1] == '.') 1668 f->f_host[--hl] = '\0'; 1669 trimdomain(f->f_host, hl); 1670 } 1671 1672 /* save program name if any */ 1673 if (prog && *prog == '*') 1674 prog = NULL; 1675 if (prog) { 1676 f->f_program = strdup(prog); 1677 if (f->f_program == NULL) { 1678 logerror("strdup"); 1679 exit(1); 1680 } 1681 } 1682 1683 /* scan through the list of selectors */ 1684 for (p = line; *p && *p != '\t' && *p != ' ';) { 1685 int pri_done; 1686 int pri_cmp; 1687 int pri_invert; 1688 1689 /* find the end of this facility name list */ 1690 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1691 continue; 1692 1693 /* get the priority comparison */ 1694 pri_cmp = 0; 1695 pri_done = 0; 1696 pri_invert = 0; 1697 if (*q == '!') { 1698 pri_invert = 1; 1699 q++; 1700 } 1701 while (!pri_done) { 1702 switch (*q) { 1703 case '<': 1704 pri_cmp |= PRI_LT; 1705 q++; 1706 break; 1707 case '=': 1708 pri_cmp |= PRI_EQ; 1709 q++; 1710 break; 1711 case '>': 1712 pri_cmp |= PRI_GT; 1713 q++; 1714 break; 1715 default: 1716 pri_done++; 1717 break; 1718 } 1719 } 1720 1721 /* collect priority name */ 1722 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1723 *bp++ = *q++; 1724 *bp = '\0'; 1725 1726 /* skip cruft */ 1727 while (strchr(",;", *q)) 1728 q++; 1729 1730 /* decode priority name */ 1731 if (*buf == '*') { 1732 pri = LOG_PRIMASK + 1; 1733 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1734 } else { 1735 /* Ignore trailing spaces. */ 1736 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1737 buf[i] = '\0'; 1738 1739 pri = decode(buf, prioritynames); 1740 if (pri < 0) { 1741 (void)snprintf(ebuf, sizeof ebuf, 1742 "unknown priority name \"%s\"", buf); 1743 logerror(ebuf); 1744 return; 1745 } 1746 } 1747 if (!pri_cmp) 1748 pri_cmp = (UniquePriority) 1749 ? (PRI_EQ) 1750 : (PRI_EQ | PRI_GT) 1751 ; 1752 if (pri_invert) 1753 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1754 1755 /* scan facilities */ 1756 while (*p && !strchr("\t.; ", *p)) { 1757 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1758 *bp++ = *p++; 1759 *bp = '\0'; 1760 1761 if (*buf == '*') { 1762 for (i = 0; i < LOG_NFACILITIES; i++) { 1763 f->f_pmask[i] = pri; 1764 f->f_pcmp[i] = pri_cmp; 1765 } 1766 } else { 1767 i = decode(buf, facilitynames); 1768 if (i < 0) { 1769 (void)snprintf(ebuf, sizeof ebuf, 1770 "unknown facility name \"%s\"", 1771 buf); 1772 logerror(ebuf); 1773 return; 1774 } 1775 f->f_pmask[i >> 3] = pri; 1776 f->f_pcmp[i >> 3] = pri_cmp; 1777 } 1778 while (*p == ',' || *p == ' ') 1779 p++; 1780 } 1781 1782 p = q; 1783 } 1784 1785 /* skip to action part */ 1786 while (*p == '\t' || *p == ' ') 1787 p++; 1788 1789 if (*p == '-') { 1790 syncfile = 0; 1791 p++; 1792 } else 1793 syncfile = 1; 1794 1795 switch (*p) { 1796 case '@': 1797 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1798 sizeof(f->f_un.f_forw.f_hname)); 1799 memset(&hints, 0, sizeof(hints)); 1800 hints.ai_family = family; 1801 hints.ai_socktype = SOCK_DGRAM; 1802 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1803 &res); 1804 if (error) { 1805 logerror(gai_strerror(error)); 1806 break; 1807 } 1808 f->f_un.f_forw.f_addr = res; 1809 f->f_type = F_FORW; 1810 break; 1811 1812 case '/': 1813 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1814 f->f_type = F_UNUSED; 1815 logerror(p); 1816 break; 1817 } 1818 if (syncfile) 1819 f->f_flags |= FFLAG_SYNC; 1820 if (isatty(f->f_file)) { 1821 if (strcmp(p, ctty) == 0) 1822 f->f_type = F_CONSOLE; 1823 else 1824 f->f_type = F_TTY; 1825 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1826 sizeof(f->f_un.f_fname)); 1827 } else { 1828 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1829 f->f_type = F_FILE; 1830 } 1831 break; 1832 1833 case '|': 1834 f->f_un.f_pipe.f_pid = 0; 1835 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1836 f->f_type = F_PIPE; 1837 break; 1838 1839 case '*': 1840 f->f_type = F_WALL; 1841 break; 1842 1843 default: 1844 for (i = 0; i < MAXUNAMES && *p; i++) { 1845 for (q = p; *q && *q != ','; ) 1846 q++; 1847 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1848 if ((q - p) > UT_NAMESIZE) 1849 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1850 else 1851 f->f_un.f_uname[i][q - p] = '\0'; 1852 while (*q == ',' || *q == ' ') 1853 q++; 1854 p = q; 1855 } 1856 f->f_type = F_USERS; 1857 break; 1858 } 1859} 1860 1861 1862/* 1863 * Decode a symbolic name to a numeric value 1864 */ 1865static int 1866decode(const char *name, CODE *codetab) 1867{ 1868 CODE *c; 1869 char *p, buf[40]; 1870 1871 if (isdigit(*name)) 1872 return (atoi(name)); 1873 1874 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1875 if (isupper(*name)) 1876 *p = tolower(*name); 1877 else 1878 *p = *name; 1879 } 1880 *p = '\0'; 1881 for (c = codetab; c->c_name; c++) 1882 if (!strcmp(buf, c->c_name)) 1883 return (c->c_val); 1884 1885 return (-1); 1886} 1887 1888static void 1889markit(void) 1890{ 1891 struct filed *f; 1892 dq_t q, next; 1893 1894 now = time((time_t *)NULL); 1895 MarkSeq += TIMERINTVL; 1896 if (MarkSeq >= MarkInterval) { 1897 logmsg(LOG_INFO, "-- MARK --", 1898 LocalHostName, ADDDATE|MARK); 1899 MarkSeq = 0; 1900 } 1901 1902 for (f = Files; f; f = f->f_next) { 1903 if (f->f_prevcount && now >= REPEATTIME(f)) { 1904 dprintf("flush %s: repeated %d times, %d sec.\n", 1905 TypeNames[f->f_type], f->f_prevcount, 1906 repeatinterval[f->f_repeatcount]); 1907 fprintlog(f, 0, (char *)NULL); 1908 BACKOFF(f); 1909 } 1910 } 1911 1912 /* Walk the dead queue, and see if we should signal somebody. */ 1913 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1914 next = TAILQ_NEXT(q, dq_entries); 1915 1916 switch (q->dq_timeout) { 1917 case 0: 1918 /* Already signalled once, try harder now. */ 1919 if (kill(q->dq_pid, SIGKILL) != 0) 1920 (void)deadq_remove(q->dq_pid); 1921 break; 1922 1923 case 1: 1924 /* 1925 * Timed out on dead queue, send terminate 1926 * signal. Note that we leave the removal 1927 * from the dead queue to reapchild(), which 1928 * will also log the event (unless the process 1929 * didn't even really exist, in case we simply 1930 * drop it from the dead queue). 1931 */ 1932 if (kill(q->dq_pid, SIGTERM) != 0) 1933 (void)deadq_remove(q->dq_pid); 1934 /* FALLTHROUGH */ 1935 1936 default: 1937 q->dq_timeout--; 1938 } 1939 } 1940 MarkSet = 0; 1941 (void)alarm(TIMERINTVL); 1942} 1943 1944/* 1945 * fork off and become a daemon, but wait for the child to come online 1946 * before returing to the parent, or we get disk thrashing at boot etc. 1947 * Set a timer so we don't hang forever if it wedges. 1948 */ 1949static int 1950waitdaemon(int nochdir, int noclose, int maxwait) 1951{ 1952 int fd; 1953 int status; 1954 pid_t pid, childpid; 1955 1956 switch (childpid = fork()) { 1957 case -1: 1958 return (-1); 1959 case 0: 1960 break; 1961 default: 1962 signal(SIGALRM, timedout); 1963 alarm(maxwait); 1964 while ((pid = wait3(&status, 0, NULL)) != -1) { 1965 if (WIFEXITED(status)) 1966 errx(1, "child pid %d exited with return code %d", 1967 pid, WEXITSTATUS(status)); 1968 if (WIFSIGNALED(status)) 1969 errx(1, "child pid %d exited on signal %d%s", 1970 pid, WTERMSIG(status), 1971 WCOREDUMP(status) ? " (core dumped)" : 1972 ""); 1973 if (pid == childpid) /* it's gone... */ 1974 break; 1975 } 1976 exit(0); 1977 } 1978 1979 if (setsid() == -1) 1980 return (-1); 1981 1982 if (!nochdir) 1983 (void)chdir("/"); 1984 1985 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1986 (void)dup2(fd, STDIN_FILENO); 1987 (void)dup2(fd, STDOUT_FILENO); 1988 (void)dup2(fd, STDERR_FILENO); 1989 if (fd > 2) 1990 (void)close (fd); 1991 } 1992 return (getppid()); 1993} 1994 1995/* 1996 * We get a SIGALRM from the child when it's running and finished doing it's 1997 * fsync()'s or O_SYNC writes for all the boot messages. 1998 * 1999 * We also get a signal from the kernel if the timer expires, so check to 2000 * see what happened. 2001 */ 2002static void 2003timedout(int sig __unused) 2004{ 2005 int left; 2006 left = alarm(0); 2007 signal(SIGALRM, SIG_DFL); 2008 if (left == 0) 2009 errx(1, "timed out waiting for child"); 2010 else 2011 _exit(0); 2012} 2013 2014/* 2015 * Add `s' to the list of allowable peer addresses to accept messages 2016 * from. 2017 * 2018 * `s' is a string in the form: 2019 * 2020 * [*]domainname[:{servicename|portnumber|*}] 2021 * 2022 * or 2023 * 2024 * netaddr/maskbits[:{servicename|portnumber|*}] 2025 * 2026 * Returns -1 on error, 0 if the argument was valid. 2027 */ 2028static int 2029allowaddr(char *s) 2030{ 2031 char *cp1, *cp2; 2032 struct allowedpeer ap; 2033 struct servent *se; 2034 int masklen = -1, i; 2035 struct addrinfo hints, *res; 2036 struct in_addr *addrp, *maskp; 2037 u_int32_t *addr6p, *mask6p; 2038 char ip[NI_MAXHOST]; 2039 2040#ifdef INET6 2041 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2042#endif 2043 cp1 = s; 2044 if ((cp1 = strrchr(cp1, ':'))) { 2045 /* service/port provided */ 2046 *cp1++ = '\0'; 2047 if (strlen(cp1) == 1 && *cp1 == '*') 2048 /* any port allowed */ 2049 ap.port = 0; 2050 else if ((se = getservbyname(cp1, "udp"))) { 2051 ap.port = ntohs(se->s_port); 2052 } else { 2053 ap.port = strtol(cp1, &cp2, 0); 2054 if (*cp2 != '\0') 2055 return (-1); /* port not numeric */ 2056 } 2057 } else { 2058 if ((se = getservbyname("syslog", "udp"))) 2059 ap.port = ntohs(se->s_port); 2060 else 2061 /* sanity, should not happen */ 2062 ap.port = 514; 2063 } 2064 2065 if ((cp1 = strchr(s, '/')) != NULL && 2066 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2067 *cp1 = '\0'; 2068 if ((masklen = atoi(cp1 + 1)) < 0) 2069 return (-1); 2070 } 2071#ifdef INET6 2072 if (*s == '[') { 2073 cp2 = s + strlen(s) - 1; 2074 if (*cp2 == ']') { 2075 ++s; 2076 *cp2 = '\0'; 2077 } else { 2078 cp2 = NULL; 2079 } 2080 } else { 2081 cp2 = NULL; 2082 } 2083#endif 2084 memset(&hints, 0, sizeof(hints)); 2085 hints.ai_family = PF_UNSPEC; 2086 hints.ai_socktype = SOCK_DGRAM; 2087 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2088 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2089 ap.isnumeric = 1; 2090 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2091 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2092 ap.a_mask.ss_family = res->ai_family; 2093 if (res->ai_family == AF_INET) { 2094 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2095 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2096 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2097 if (masklen < 0) { 2098 /* use default netmask */ 2099 if (IN_CLASSA(ntohl(addrp->s_addr))) 2100 maskp->s_addr = htonl(IN_CLASSA_NET); 2101 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2102 maskp->s_addr = htonl(IN_CLASSB_NET); 2103 else 2104 maskp->s_addr = htonl(IN_CLASSC_NET); 2105 } else if (masklen <= 32) { 2106 /* convert masklen to netmask */ 2107 if (masklen == 0) 2108 maskp->s_addr = 0; 2109 else 2110 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2111 } else { 2112 freeaddrinfo(res); 2113 return (-1); 2114 } 2115 /* Lose any host bits in the network number. */ 2116 addrp->s_addr &= maskp->s_addr; 2117 } 2118#ifdef INET6 2119 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2120 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2121 if (masklen < 0) 2122 masklen = 128; 2123 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2124 /* convert masklen to netmask */ 2125 while (masklen > 0) { 2126 if (masklen < 32) { 2127 *mask6p = htonl(~(0xffffffff >> masklen)); 2128 break; 2129 } 2130 *mask6p++ = 0xffffffff; 2131 masklen -= 32; 2132 } 2133 /* Lose any host bits in the network number. */ 2134 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2135 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2136 for (i = 0; i < 4; i++) 2137 addr6p[i] &= mask6p[i]; 2138 } 2139#endif 2140 else { 2141 freeaddrinfo(res); 2142 return (-1); 2143 } 2144 freeaddrinfo(res); 2145 } else { 2146 /* arg `s' is domain name */ 2147 ap.isnumeric = 0; 2148 ap.a_name = s; 2149 if (cp1) 2150 *cp1 = '/'; 2151#ifdef INET6 2152 if (cp2) { 2153 *cp2 = ']'; 2154 --s; 2155 } 2156#endif 2157 } 2158 2159 if (Debug) { 2160 printf("allowaddr: rule %d: ", NumAllowed); 2161 if (ap.isnumeric) { 2162 printf("numeric, "); 2163 getnameinfo((struct sockaddr *)&ap.a_addr, 2164 ((struct sockaddr *)&ap.a_addr)->sa_len, 2165 ip, sizeof ip, NULL, 0, 2166 NI_NUMERICHOST | withscopeid); 2167 printf("addr = %s, ", ip); 2168 getnameinfo((struct sockaddr *)&ap.a_mask, 2169 ((struct sockaddr *)&ap.a_mask)->sa_len, 2170 ip, sizeof ip, NULL, 0, 2171 NI_NUMERICHOST | withscopeid); 2172 printf("mask = %s; ", ip); 2173 } else { 2174 printf("domainname = %s; ", ap.a_name); 2175 } 2176 printf("port = %d\n", ap.port); 2177 } 2178 2179 if ((AllowedPeers = realloc(AllowedPeers, 2180 ++NumAllowed * sizeof(struct allowedpeer))) 2181 == NULL) { 2182 logerror("realloc"); 2183 exit(1); 2184 } 2185 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2186 return (0); 2187} 2188 2189/* 2190 * Validate that the remote peer has permission to log to us. 2191 */ 2192static int 2193validate(struct sockaddr *sa, const char *hname) 2194{ 2195 int i, j, reject; 2196 size_t l1, l2; 2197 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2198 struct allowedpeer *ap; 2199 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2200 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2201 struct addrinfo hints, *res; 2202 u_short sport; 2203 2204 if (NumAllowed == 0) 2205 /* traditional behaviour, allow everything */ 2206 return (1); 2207 2208 (void)strlcpy(name, hname, sizeof(name)); 2209 memset(&hints, 0, sizeof(hints)); 2210 hints.ai_family = PF_UNSPEC; 2211 hints.ai_socktype = SOCK_DGRAM; 2212 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2213 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2214 freeaddrinfo(res); 2215 else if (strchr(name, '.') == NULL) { 2216 strlcat(name, ".", sizeof name); 2217 strlcat(name, LocalDomain, sizeof name); 2218 } 2219 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2220 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2221 return (0); /* for safety, should not occur */ 2222 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2223 ip, port, name); 2224 sport = atoi(port); 2225 2226 /* now, walk down the list */ 2227 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2228 if (ap->port != 0 && ap->port != sport) { 2229 dprintf("rejected in rule %d due to port mismatch.\n", i); 2230 continue; 2231 } 2232 2233 if (ap->isnumeric) { 2234 if (ap->a_addr.ss_family != sa->sa_family) { 2235 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2236 continue; 2237 } 2238 if (ap->a_addr.ss_family == AF_INET) { 2239 sin4 = (struct sockaddr_in *)sa; 2240 a4p = (struct sockaddr_in *)&ap->a_addr; 2241 m4p = (struct sockaddr_in *)&ap->a_mask; 2242 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2243 != a4p->sin_addr.s_addr) { 2244 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2245 continue; 2246 } 2247 } 2248#ifdef INET6 2249 else if (ap->a_addr.ss_family == AF_INET6) { 2250 sin6 = (struct sockaddr_in6 *)sa; 2251 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2252 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2253#ifdef NI_WITHSCOPEID 2254 if (a6p->sin6_scope_id != 0 && 2255 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2256 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2257 continue; 2258 } 2259#endif 2260 reject = 0; 2261 for (j = 0; j < 16; j += 4) { 2262 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2263 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2264 ++reject; 2265 break; 2266 } 2267 } 2268 if (reject) { 2269 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2270 continue; 2271 } 2272 } 2273#endif 2274 else 2275 continue; 2276 } else { 2277 cp = ap->a_name; 2278 l1 = strlen(name); 2279 if (*cp == '*') { 2280 /* allow wildmatch */ 2281 cp++; 2282 l2 = strlen(cp); 2283 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2284 dprintf("rejected in rule %d due to name mismatch.\n", i); 2285 continue; 2286 } 2287 } else { 2288 /* exact match */ 2289 l2 = strlen(cp); 2290 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2291 dprintf("rejected in rule %d due to name mismatch.\n", i); 2292 continue; 2293 } 2294 } 2295 } 2296 dprintf("accepted in rule %d.\n", i); 2297 return (1); /* hooray! */ 2298 } 2299 return (0); 2300} 2301 2302/* 2303 * Fairly similar to popen(3), but returns an open descriptor, as 2304 * opposed to a FILE *. 2305 */ 2306static int 2307p_open(const char *prog, pid_t *rpid) 2308{ 2309 int pfd[2], nulldesc, i; 2310 pid_t pid; 2311 sigset_t omask, mask; 2312 char *argv[4]; /* sh -c cmd NULL */ 2313 char errmsg[200]; 2314 2315 if (pipe(pfd) == -1) 2316 return (-1); 2317 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2318 /* we are royally screwed anyway */ 2319 return (-1); 2320 2321 sigemptyset(&mask); 2322 sigaddset(&mask, SIGALRM); 2323 sigaddset(&mask, SIGHUP); 2324 sigprocmask(SIG_BLOCK, &mask, &omask); 2325 switch ((pid = fork())) { 2326 case -1: 2327 sigprocmask(SIG_SETMASK, &omask, 0); 2328 close(nulldesc); 2329 return (-1); 2330 2331 case 0: 2332 argv[0] = strdup("sh"); 2333 argv[1] = strdup("-c"); 2334 argv[2] = strdup(prog); 2335 argv[3] = NULL; 2336 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2337 logerror("strdup"); 2338 exit(1); 2339 } 2340 2341 alarm(0); 2342 (void)setsid(); /* Avoid catching SIGHUPs. */ 2343 2344 /* 2345 * Throw away pending signals, and reset signal 2346 * behaviour to standard values. 2347 */ 2348 signal(SIGALRM, SIG_IGN); 2349 signal(SIGHUP, SIG_IGN); 2350 sigprocmask(SIG_SETMASK, &omask, 0); 2351 signal(SIGPIPE, SIG_DFL); 2352 signal(SIGQUIT, SIG_DFL); 2353 signal(SIGALRM, SIG_DFL); 2354 signal(SIGHUP, SIG_DFL); 2355 2356 dup2(pfd[0], STDIN_FILENO); 2357 dup2(nulldesc, STDOUT_FILENO); 2358 dup2(nulldesc, STDERR_FILENO); 2359 for (i = getdtablesize(); i > 2; i--) 2360 (void)close(i); 2361 2362 (void)execvp(_PATH_BSHELL, argv); 2363 _exit(255); 2364 } 2365 2366 sigprocmask(SIG_SETMASK, &omask, 0); 2367 close(nulldesc); 2368 close(pfd[0]); 2369 /* 2370 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2371 * supposed to get an EWOULDBLOCK on writev(2), which is 2372 * caught by the logic above anyway, which will in turn close 2373 * the pipe, and fork a new logging subprocess if necessary. 2374 * The stale subprocess will be killed some time later unless 2375 * it terminated itself due to closing its input pipe (so we 2376 * get rid of really dead puppies). 2377 */ 2378 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2379 /* This is bad. */ 2380 (void)snprintf(errmsg, sizeof errmsg, 2381 "Warning: cannot change pipe to PID %d to " 2382 "non-blocking behaviour.", 2383 (int)pid); 2384 logerror(errmsg); 2385 } 2386 *rpid = pid; 2387 return (pfd[1]); 2388} 2389 2390static void 2391deadq_enter(pid_t pid, const char *name) 2392{ 2393 dq_t p; 2394 int status; 2395 2396 /* 2397 * Be paranoid, if we can't signal the process, don't enter it 2398 * into the dead queue (perhaps it's already dead). If possible, 2399 * we try to fetch and log the child's status. 2400 */ 2401 if (kill(pid, 0) != 0) { 2402 if (waitpid(pid, &status, WNOHANG) > 0) 2403 log_deadchild(pid, status, name); 2404 return; 2405 } 2406 2407 p = malloc(sizeof(struct deadq_entry)); 2408 if (p == NULL) { 2409 logerror("malloc"); 2410 exit(1); 2411 } 2412 2413 p->dq_pid = pid; 2414 p->dq_timeout = DQ_TIMO_INIT; 2415 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2416} 2417 2418static int 2419deadq_remove(pid_t pid) 2420{ 2421 dq_t q; 2422 2423 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2424 if (q->dq_pid == pid) { 2425 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2426 free(q); 2427 return (1); 2428 } 2429 } 2430 2431 return (0); 2432} 2433 2434static void 2435log_deadchild(pid_t pid, int status, const char *name) 2436{ 2437 int code; 2438 char buf[256]; 2439 const char *reason; 2440 2441 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2442 if (WIFSIGNALED(status)) { 2443 reason = "due to signal"; 2444 code = WTERMSIG(status); 2445 } else { 2446 reason = "with status"; 2447 code = WEXITSTATUS(status); 2448 if (code == 0) 2449 return; 2450 } 2451 (void)snprintf(buf, sizeof buf, 2452 "Logging subprocess %d (%s) exited %s %d.", 2453 pid, name, reason, code); 2454 logerror(buf); 2455} 2456 2457static int * 2458socksetup(int af, const char *bindhostname) 2459{ 2460 struct addrinfo hints, *res, *r; 2461 int error, maxs, *s, *socks; 2462 2463 memset(&hints, 0, sizeof(hints)); 2464 hints.ai_flags = AI_PASSIVE; 2465 hints.ai_family = af; 2466 hints.ai_socktype = SOCK_DGRAM; 2467 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2468 if (error) { 2469 logerror(gai_strerror(error)); 2470 errno = 0; 2471 die(0); 2472 } 2473 2474 /* Count max number of sockets we may open */ 2475 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2476 socks = malloc((maxs+1) * sizeof(int)); 2477 if (socks == NULL) { 2478 logerror("couldn't allocate memory for sockets"); 2479 die(0); 2480 } 2481 2482 *socks = 0; /* num of sockets counter at start of array */ 2483 s = socks + 1; 2484 for (r = res; r; r = r->ai_next) { 2485 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2486 if (*s < 0) { 2487 logerror("socket"); 2488 continue; 2489 } 2490 if (r->ai_family == AF_INET6) { 2491 int on = 1; 2492 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2493 (char *)&on, sizeof (on)) < 0) { 2494 logerror("setsockopt"); 2495 close(*s); 2496 continue; 2497 } 2498 } 2499 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2500 close(*s); 2501 logerror("bind"); 2502 continue; 2503 } 2504 2505 (*socks)++; 2506 s++; 2507 } 2508 2509 if (*socks == 0) { 2510 free(socks); 2511 if (Debug) 2512 return (NULL); 2513 else 2514 die(0); 2515 } 2516 if (res) 2517 freeaddrinfo(res); 2518 2519 return (socks); 2520} 2521