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 * @(#) Copyright (c) 1983, 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94 35 * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.130 2004/07/04 19:52:48 cperciva Exp $ 36 * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.6 2007/08/09 02:17:46 dillon Exp $ 37 */ 38 39 /* 40 * syslogd -- log system messages 41 * 42 * This program implements a system log. It takes a series of lines. 43 * Each line may have a priority, signified as "<n>" as 44 * the first characters of the line. If this is 45 * not present, a default priority is used. 46 * 47 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 48 * cause it to reread its configuration file. 49 * 50 * Defined Constants: 51 * 52 * MAXLINE -- the maximum line length that can be handled. 53 * DEFUPRI -- the default priority for user messages 54 * DEFSPRI -- the default priority for kernel messages 55 * 56 * Author: Eric Allman 57 * extensive changes by Ralph Campbell 58 * more extensive changes by Eric Allman (again) 59 * Extension to log by program name as well as facility and priority 60 * by Peter da Silva. 61 * -u and -v by Harlan Stenn. 62 * Priority comparison code by Harlan Stenn. 63 * Ring buffer code by Jeff Wheelhouse. 64 */ 65 66 #define MAXLINE 1024 /* maximum line length */ 67 #define MAXSVLINE 120 /* maximum saved line length */ 68 #define DEFUPRI (LOG_USER|LOG_NOTICE) 69 #define DEFSPRI (LOG_KERN|LOG_CRIT) 70 #define TIMERINTVL 30 /* interval for checking flush, mark */ 71 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 72 73 #include <sys/param.h> 74 #include <sys/ioctl.h> 75 #include <sys/stat.h> 76 #include <sys/wait.h> 77 #include <sys/socket.h> 78 #include <sys/queue.h> 79 #include <sys/uio.h> 80 #include <sys/un.h> 81 #include <sys/time.h> 82 #include <sys/resource.h> 83 #include <sys/syslimits.h> 84 #include <sys/mman.h> 85 #include <sys/types.h> 86 87 #include <netinet/in.h> 88 #include <netdb.h> 89 #include <arpa/inet.h> 90 91 #include <ctype.h> 92 #include <err.h> 93 #include <errno.h> 94 #include <fcntl.h> 95 #include <libutil.h> 96 #include <limits.h> 97 #include <paths.h> 98 #include <signal.h> 99 #include <stdio.h> 100 #include <stdlib.h> 101 #include <string.h> 102 #include <sysexits.h> 103 #include <unistd.h> 104 #include <utmp.h> 105 106 #include "pathnames.h" 107 #include "ttymsg.h" 108 #include "../clog/clog.h" 109 110 #define SYSLOG_NAMES 111 #include <sys/syslog.h> 112 113 #ifdef NI_WITHSCOPEID 114 static const int withscopeid = NI_WITHSCOPEID; 115 #else 116 static const int withscopeid; 117 #endif 118 119 const char *ConfFile = _PATH_LOGCONF; 120 const char *PidFile = _PATH_LOGPID; 121 const char ctty[] = _PATH_CONSOLE; 122 const char ring_magic[] = "CLOG"; 123 124 #define dprintf if (Debug) printf 125 126 #define MAXUNAMES 20 /* maximum number of user names */ 127 128 #define MAXFUNIX 20 129 130 int nfunix = 1; 131 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 132 int funix[MAXFUNIX]; 133 134 /* 135 * Flags to logmsg(). 136 */ 137 138 #define IGN_CONS 0x001 /* don't print on console */ 139 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 140 #define ADDDATE 0x004 /* add a date to the message */ 141 #define MARK 0x008 /* this message is a mark */ 142 #define ISKERNEL 0x010 /* kernel generated message */ 143 144 /* 145 * This structure represents the files that will have log 146 * copies printed. 147 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 148 * or if f_type if F_PIPE and f_pid > 0. 149 */ 150 151 struct filed { 152 struct filed *f_next; /* next in linked list */ 153 short f_type; /* entry type, see below */ 154 short f_file; /* file descriptor */ 155 time_t f_time; /* time this was last written */ 156 char *f_host; /* host from which to recd. */ 157 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 158 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 159 #define PRI_LT 0x1 160 #define PRI_EQ 0x2 161 #define PRI_GT 0x4 162 char *f_program; /* program this applies to */ 163 union { 164 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 165 struct { 166 char f_hname[MAXHOSTNAMELEN]; 167 struct addrinfo *f_addr; 168 169 } f_forw; /* forwarding address */ 170 char f_fname[MAXPATHLEN]; 171 struct { 172 char f_pname[MAXPATHLEN]; 173 pid_t f_pid; 174 } f_pipe; 175 struct { 176 char f_rname[MAXPATHLEN]; 177 struct clog_footer *f_footer; 178 size_t f_size; 179 } f_ring; 180 } f_un; 181 char f_prevline[MAXSVLINE]; /* last message logged */ 182 char f_lasttime[16]; /* time of last occurrence */ 183 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 184 int f_prevpri; /* pri of f_prevline */ 185 int f_prevlen; /* length of f_prevline */ 186 int f_prevcount; /* repetition cnt of prevline */ 187 u_int f_repeatcount; /* number of "repeated" msgs */ 188 int f_flags; /* file-specific flags */ 189 #define FFLAG_SYNC 0x01 190 #define FFLAG_NEEDSYNC 0x02 191 }; 192 193 /* 194 * Queue of about-to-be dead processes we should watch out for. 195 */ 196 197 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 198 struct stailhead *deadq_headp; 199 200 struct 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 2 213 214 typedef 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 */ 221 struct 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 */ 242 int 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 #define F_RING 8 /* ring buffer (circular log) */ 259 260 const char *TypeNames[] = { 261 "UNUSED", "FILE", "TTY", "CONSOLE", 262 "FORW", "USERS", "WALL", "PIPE", 263 "RING" 264 }; 265 266 static struct filed *Files; /* Log files that we write to */ 267 static struct filed consfile; /* Console */ 268 269 static int Debug; /* debug flag */ 270 static int resolve = 1; /* resolve hostname */ 271 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 272 static const char *LocalDomain; /* our local domain name */ 273 static int *finet; /* Internet datagram socket */ 274 static int fklog = -1; /* /dev/klog */ 275 static int Initialized; /* set when we have initialized ourselves */ 276 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 277 static int MarkSeq; /* mark sequence number */ 278 static int SecureMode; /* when true, receive only unix domain socks */ 279 #ifdef INET6 280 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 281 #else 282 static int family = PF_INET; /* protocol family (IPv4 only) */ 283 #endif 284 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 285 static int use_bootfile; /* log entire bootfile for every kern msg */ 286 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 287 288 static char bootfile[MAXLINE+1]; /* booted kernel file */ 289 290 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 291 static int NumAllowed; /* Number of entries in AllowedPeers */ 292 293 static int UniquePriority; /* Only log specified priority? */ 294 static int LogFacPri; /* Put facility and priority in log message: */ 295 /* 0=no, 1=numeric, 2=names */ 296 static int KeepKernFac; /* Keep remotely logged kernel facility */ 297 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 298 299 volatile sig_atomic_t MarkSet, WantDie; 300 301 static int allowaddr(char *); 302 static void cfline(const char *, struct filed *, 303 const char *, const char *); 304 static const char *cvthname(struct sockaddr *); 305 static void deadq_enter(pid_t, const char *); 306 static int deadq_remove(pid_t); 307 static int decode(const char *, CODE *); 308 static void die(int); 309 static void dodie(int); 310 static void dofsync(void); 311 static void domark(int); 312 static void fprintlog(struct filed *, int, const char *); 313 static int *socksetup(int, const char *); 314 static void setsockbuffer(int); 315 static void init(int); 316 static void logerror(const char *); 317 static void logmsg(int, const char *, const char *, int); 318 static void log_deadchild(pid_t, int, const char *); 319 static void markit(void); 320 static int skip_message(const char *, const char *, int); 321 static void printline(const char *, char *); 322 static void printsys(char *); 323 static int p_open(const char *, pid_t *); 324 ssize_t rbwrite(struct filed *, char *, size_t); 325 ssize_t rbwritev(struct filed *, struct iovec *, int); 326 static void readklog(void); 327 static void reapchild(int); 328 static void usage(void); 329 static int validate(struct sockaddr *, const char *); 330 static void unmapped(struct sockaddr *); 331 static void wallmsg(struct filed *, struct iovec *); 332 static int waitdaemon(int, int, int); 333 static void timedout(int); 334 335 int 336 main(int argc, char *argv[]) 337 { 338 int ch, i, fdsrmax = 0, l; 339 struct sockaddr_un sunx, fromunix; 340 struct sockaddr_storage frominet; 341 fd_set *fdsr = NULL; 342 FILE *fp; 343 char line[MAXLINE + 1]; 344 const char *bindhostname, *hname; 345 struct timeval tv, *tvp; 346 struct sigaction sact; 347 sigset_t mask; 348 pid_t ppid = 1; 349 socklen_t len; 350 351 bindhostname = NULL; 352 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 353 switch (ch) { 354 case '4': 355 family = PF_INET; 356 break; 357 #ifdef INET6 358 case '6': 359 family = PF_INET6; 360 break; 361 #endif 362 case 'A': 363 send_to_all++; 364 break; 365 case 'a': /* allow specific network addresses only */ 366 if (allowaddr(optarg) == -1) 367 usage(); 368 break; 369 case 'b': 370 bindhostname = optarg; 371 break; 372 case 'c': 373 no_compress++; 374 break; 375 case 'd': /* debug */ 376 Debug++; 377 break; 378 case 'f': /* configuration file */ 379 ConfFile = optarg; 380 break; 381 case 'k': /* keep remote kern fac */ 382 KeepKernFac = 1; 383 break; 384 case 'l': 385 if (strlen(optarg) >= sizeof(sunx.sun_path)) 386 errx(1, "%s path too long, exiting", optarg); 387 if (nfunix < MAXFUNIX) 388 funixn[nfunix++] = optarg; 389 else 390 warnx("out of descriptors, ignoring %s", 391 optarg); 392 break; 393 case 'm': /* mark interval */ 394 MarkInterval = atoi(optarg) * 60; 395 break; 396 case 'n': 397 resolve = 0; 398 break; 399 case 'o': 400 use_bootfile = 1; 401 break; 402 case 'p': /* path */ 403 if (strlen(optarg) >= sizeof(sunx.sun_path)) 404 errx(1, "%s path too long, exiting", optarg); 405 funixn[0] = optarg; 406 break; 407 case 'P': /* path for alt. PID */ 408 PidFile = optarg; 409 break; 410 case 's': /* no network mode */ 411 SecureMode++; 412 break; 413 case 'u': /* only log specified priority */ 414 UniquePriority++; 415 break; 416 case 'v': /* log facility and priority */ 417 LogFacPri++; 418 break; 419 default: 420 usage(); 421 } 422 if ((argc -= optind) != 0) 423 usage(); 424 425 if (!Debug) { 426 ppid = waitdaemon(0, 0, 30); 427 if (ppid < 0) 428 err(1, "could not become daemon"); 429 } else { 430 setlinebuf(stdout); 431 } 432 433 if (NumAllowed) 434 endservent(); 435 436 consfile.f_type = F_CONSOLE; 437 strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 438 sizeof(consfile.f_un.f_fname)); 439 strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 440 signal(SIGTERM, dodie); 441 signal(SIGINT, Debug ? dodie : SIG_IGN); 442 signal(SIGQUIT, Debug ? dodie : SIG_IGN); 443 /* 444 * We don't want the SIGCHLD and SIGHUP handlers to interfere 445 * with each other; they are likely candidates for being called 446 * simultaneously (SIGHUP closes pipe descriptor, process dies, 447 * SIGCHLD happens). 448 */ 449 sigemptyset(&mask); 450 sigaddset(&mask, SIGHUP); 451 sact.sa_handler = reapchild; 452 sact.sa_mask = mask; 453 sact.sa_flags = SA_RESTART; 454 sigaction(SIGCHLD, &sact, NULL); 455 signal(SIGALRM, domark); 456 signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 457 alarm(TIMERINTVL); 458 459 TAILQ_INIT(&deadq_head); 460 461 #ifndef SUN_LEN 462 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 463 #endif 464 for (i = 0; i < nfunix; i++) { 465 unlink(funixn[i]); 466 memset(&sunx, 0, sizeof(sunx)); 467 sunx.sun_family = AF_UNIX; 468 strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 469 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 470 if (funix[i] < 0 || 471 bind(funix[i], (struct sockaddr *)&sunx, 472 SUN_LEN(&sunx)) < 0 || 473 chmod(funixn[i], 0666) < 0) { 474 snprintf(line, sizeof line, 475 "cannot create %s", funixn[i]); 476 logerror(line); 477 dprintf("cannot create %s (%d)\n", funixn[i], errno); 478 if (i == 0) 479 die(0); 480 } 481 if (funix[i] >= 0) 482 setsockbuffer(funix[i]); 483 } 484 if (SecureMode <= 1) 485 finet = socksetup(family, bindhostname); 486 487 if (finet) { 488 if (SecureMode) { 489 for (i = 0; i < *finet; i++) { 490 if (shutdown(finet[i+1], SHUT_RD) < 0) { 491 logerror("shutdown"); 492 if (!Debug) 493 die(0); 494 } 495 } 496 } else { 497 dprintf("listening on inet and/or inet6 socket\n"); 498 } 499 dprintf("sending on inet and/or inet6 socket\n"); 500 } 501 502 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 503 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 504 fklog = -1; 505 if (fklog < 0) 506 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 507 508 /* tuck my process id away */ 509 fp = fopen(PidFile, "w"); 510 if (fp != NULL) { 511 fprintf(fp, "%d\n", getpid()); 512 fclose(fp); 513 } 514 515 dprintf("off & running....\n"); 516 517 init(0); 518 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 519 sigemptyset(&mask); 520 sigaddset(&mask, SIGCHLD); 521 sact.sa_handler = init; 522 sact.sa_mask = mask; 523 sact.sa_flags = SA_RESTART; 524 sigaction(SIGHUP, &sact, NULL); 525 526 tvp = &tv; 527 tv.tv_sec = tv.tv_usec = 0; 528 529 if (fklog != -1 && fklog > fdsrmax) 530 fdsrmax = fklog; 531 if (finet && !SecureMode) { 532 for (i = 0; i < *finet; i++) { 533 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 534 fdsrmax = finet[i+1]; 535 } 536 } 537 for (i = 0; i < nfunix; i++) { 538 if (funix[i] != -1 && funix[i] > fdsrmax) 539 fdsrmax = funix[i]; 540 } 541 542 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 543 sizeof(fd_mask)); 544 if (fdsr == NULL) 545 errx(1, "calloc fd_set"); 546 547 for (;;) { 548 if (MarkSet) 549 markit(); 550 if (WantDie) 551 die(WantDie); 552 553 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 554 sizeof(fd_mask)); 555 556 if (fklog != -1) 557 FD_SET(fklog, fdsr); 558 if (finet && !SecureMode) { 559 for (i = 0; i < *finet; i++) { 560 if (finet[i+1] != -1) 561 FD_SET(finet[i+1], fdsr); 562 } 563 } 564 for (i = 0; i < nfunix; i++) { 565 if (funix[i] != -1) 566 FD_SET(funix[i], fdsr); 567 } 568 569 i = select(fdsrmax+1, fdsr, NULL, NULL, 570 needdofsync ? &tv : tvp); 571 switch (i) { 572 case 0: 573 dofsync(); 574 needdofsync = 0; 575 if (tvp) { 576 tvp = NULL; 577 if (ppid != 1) 578 kill(ppid, SIGALRM); 579 } 580 continue; 581 case -1: 582 if (errno != EINTR) 583 logerror("select"); 584 continue; 585 } 586 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 587 readklog(); 588 if (finet && !SecureMode) { 589 for (i = 0; i < *finet; i++) { 590 if (FD_ISSET(finet[i+1], fdsr)) { 591 len = sizeof(frominet); 592 l = recvfrom(finet[i+1], line, MAXLINE, 593 0, (struct sockaddr *)&frominet, 594 &len); 595 if (l > 0) { 596 line[l] = '\0'; 597 hname = cvthname((struct sockaddr *)&frominet); 598 unmapped((struct sockaddr *)&frominet); 599 if (validate((struct sockaddr *)&frominet, hname)) 600 printline(hname, line); 601 } else if (l < 0 && errno != EINTR) 602 logerror("recvfrom inet"); 603 } 604 } 605 } 606 for (i = 0; i < nfunix; i++) { 607 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 608 len = sizeof(fromunix); 609 l = recvfrom(funix[i], line, MAXLINE, 0, 610 (struct sockaddr *)&fromunix, &len); 611 if (l > 0) { 612 line[l] = '\0'; 613 printline(LocalHostName, line); 614 } else if (l < 0 && errno != EINTR) 615 logerror("recvfrom unix"); 616 } 617 } 618 } 619 if (fdsr) 620 free(fdsr); 621 } 622 623 static void 624 unmapped(struct sockaddr *sa) 625 { 626 struct sockaddr_in6 *sin6; 627 struct sockaddr_in sin4; 628 629 if (sa->sa_family != AF_INET6) 630 return; 631 if (sa->sa_len != sizeof(struct sockaddr_in6) || 632 sizeof(sin4) > sa->sa_len) 633 return; 634 sin6 = (struct sockaddr_in6 *)sa; 635 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 636 return; 637 638 memset(&sin4, 0, sizeof(sin4)); 639 sin4.sin_family = AF_INET; 640 sin4.sin_len = sizeof(struct sockaddr_in); 641 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 642 sizeof(sin4.sin_addr)); 643 sin4.sin_port = sin6->sin6_port; 644 645 memcpy(sa, &sin4, sin4.sin_len); 646 } 647 648 static void 649 usage(void) 650 { 651 652 fprintf(stderr, "%s\n%s\n%s\n%s\n", 653 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 654 " [-b bind address] [-f config_file]", 655 " [-l log_socket] [-m mark_interval]", 656 " [-P pid_file] [-p log_socket]"); 657 exit(1); 658 } 659 660 /* 661 * Take a raw input line, decode the message, and print the message 662 * on the appropriate log files. 663 */ 664 static void 665 printline(const char *hname, char *msg) 666 { 667 char *p, *q; 668 long n; 669 int c, pri; 670 char line[MAXLINE + 1]; 671 672 /* test for special codes */ 673 p = msg; 674 pri = DEFUPRI; 675 if (*p == '<') { 676 errno = 0; 677 n = strtol(p + 1, &q, 10); 678 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 679 p = q + 1; 680 pri = n; 681 } 682 } 683 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 684 pri = DEFUPRI; 685 686 /* 687 * Don't allow users to log kernel messages. 688 * NOTE: since LOG_KERN == 0 this will also match 689 * messages with no facility specified. 690 */ 691 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 692 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 693 694 q = line; 695 696 while ((c = (unsigned char)*p++) != '\0' && 697 q < &line[sizeof(line) - 4]) { 698 if ((c & 0x80) && c < 0xA0) { 699 c &= 0x7F; 700 *q++ = 'M'; 701 *q++ = '-'; 702 } 703 if (isascii(c) && iscntrl(c)) { 704 if (c == '\n') { 705 *q++ = ' '; 706 } else if (c == '\t') { 707 *q++ = '\t'; 708 } else { 709 *q++ = '^'; 710 *q++ = c ^ 0100; 711 } 712 } else { 713 *q++ = c; 714 } 715 } 716 *q = '\0'; 717 718 logmsg(pri, line, hname, 0); 719 } 720 721 /* 722 * Read /dev/klog while data are available, split into lines. 723 */ 724 static void 725 readklog(void) 726 { 727 char *p, *q, line[MAXLINE + 1]; 728 int len, i; 729 730 len = 0; 731 for (;;) { 732 i = read(fklog, line + len, MAXLINE - 1 - len); 733 if (i > 0) { 734 line[i + len] = '\0'; 735 } else { 736 if (i < 0 && errno != EINTR && errno != EAGAIN) { 737 logerror("klog"); 738 fklog = -1; 739 } 740 break; 741 } 742 743 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 744 *q = '\0'; 745 printsys(p); 746 } 747 len = strlen(p); 748 if (len >= MAXLINE - 1) { 749 printsys(p); 750 len = 0; 751 } 752 if (len > 0) 753 memmove(line, p, len + 1); 754 } 755 if (len > 0) 756 printsys(line); 757 } 758 759 /* 760 * Take a raw input line from /dev/klog, format similar to syslog(). 761 */ 762 static void 763 printsys(char *msg) 764 { 765 char *p, *q; 766 long n; 767 int flags, isprintf, pri; 768 769 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 770 p = msg; 771 pri = DEFSPRI; 772 isprintf = 1; 773 if (*p == '<') { 774 errno = 0; 775 n = strtol(p + 1, &q, 10); 776 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 777 p = q + 1; 778 pri = n; 779 isprintf = 0; 780 } 781 } 782 /* 783 * Kernel printf's and LOG_CONSOLE messages have been displayed 784 * on the console already. 785 */ 786 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 787 flags |= IGN_CONS; 788 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 789 pri = DEFSPRI; 790 logmsg(pri, p, LocalHostName, flags); 791 } 792 793 static time_t now; 794 795 /* 796 * Match a program or host name against a specification. 797 * Return a non-0 value if the message must be ignored 798 * based on the specification. 799 */ 800 static int 801 skip_message(const char *name, const char *spec, int checkcase) { 802 const char *s; 803 char prev, next; 804 int exclude = 0; 805 /* Behaviour on explicit match */ 806 807 if (spec == NULL) 808 return 0; 809 switch (*spec) { 810 case '-': 811 exclude = 1; 812 /*FALLTHROUGH*/ 813 case '+': 814 spec++; 815 break; 816 default: 817 break; 818 } 819 if (checkcase) 820 s = strstr (spec, name); 821 else 822 s = strcasestr (spec, name); 823 824 if (s != NULL) { 825 prev = (s == spec ? ',' : *(s - 1)); 826 next = *(s + strlen (name)); 827 828 if (prev == ',' && (next == '\0' || next == ',')) 829 /* Explicit match: skip iff the spec is an 830 exclusive one. */ 831 return exclude; 832 } 833 834 /* No explicit match for this name: skip the message iff 835 the spec is an inclusive one. */ 836 return !exclude; 837 } 838 839 /* 840 * Log a message to the appropriate log files, users, etc. based on 841 * the priority. 842 */ 843 static void 844 logmsg(int pri, const char *msg, const char *from, int flags) 845 { 846 struct filed *f; 847 int i, fac, msglen, omask, prilev; 848 const char *timestamp; 849 char prog[NAME_MAX+1]; 850 char buf[MAXLINE+1]; 851 852 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 853 pri, flags, from, msg); 854 855 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 856 857 /* 858 * Check to see if msg looks non-standard. 859 */ 860 msglen = strlen(msg); 861 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 862 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 863 flags |= ADDDATE; 864 865 time(&now); 866 if (flags & ADDDATE) { 867 timestamp = ctime(&now) + 4; 868 } else { 869 timestamp = msg; 870 msg += 16; 871 msglen -= 16; 872 } 873 874 /* skip leading blanks */ 875 while (isspace(*msg)) { 876 msg++; 877 msglen--; 878 } 879 880 /* extract facility and priority level */ 881 if (flags & MARK) 882 fac = LOG_NFACILITIES; 883 else 884 fac = LOG_FAC(pri); 885 prilev = LOG_PRI(pri); 886 887 /* extract program name */ 888 for (i = 0; i < NAME_MAX; i++) { 889 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 890 msg[i] == '/') 891 break; 892 prog[i] = msg[i]; 893 } 894 prog[i] = 0; 895 896 /* add kernel prefix for kernel messages */ 897 if (flags & ISKERNEL) { 898 snprintf(buf, sizeof(buf), "%s: %s", 899 use_bootfile ? bootfile : "kernel", msg); 900 msg = buf; 901 msglen = strlen(buf); 902 } 903 904 /* log the message to the particular outputs */ 905 if (!Initialized) { 906 f = &consfile; 907 f->f_file = open(ctty, O_WRONLY, 0); 908 909 if (f->f_file >= 0) { 910 strlcpy(f->f_lasttime, timestamp, 911 sizeof(f->f_lasttime)); 912 fprintlog(f, flags, msg); 913 close(f->f_file); 914 } 915 sigsetmask(omask); 916 return; 917 } 918 for (f = Files; f; f = f->f_next) { 919 /* skip messages that are incorrect priority */ 920 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 921 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 922 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 923 ) 924 || f->f_pmask[fac] == INTERNAL_NOPRI) 925 continue; 926 927 /* skip messages with the incorrect hostname */ 928 if (skip_message(from, f->f_host, 0)) 929 continue; 930 931 /* skip messages with the incorrect program name */ 932 if (skip_message(prog, f->f_program, 1)) 933 continue; 934 935 /* skip message to console if it has already been printed */ 936 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 937 continue; 938 939 /* don't output marks to recently written files */ 940 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 941 continue; 942 943 /* 944 * suppress duplicate lines to this file 945 */ 946 if (no_compress - (f->f_type != F_PIPE) < 1 && 947 (flags & MARK) == 0 && msglen == f->f_prevlen && 948 !strcmp(msg, f->f_prevline) && 949 !strcasecmp(from, f->f_prevhost)) { 950 strlcpy(f->f_lasttime, timestamp, 951 sizeof(f->f_lasttime)); 952 f->f_prevcount++; 953 dprintf("msg repeated %d times, %ld sec of %d\n", 954 f->f_prevcount, (long)(now - f->f_time), 955 repeatinterval[f->f_repeatcount]); 956 /* 957 * If domark would have logged this by now, 958 * flush it now (so we don't hold isolated messages), 959 * but back off so we'll flush less often 960 * in the future. 961 */ 962 if (now > REPEATTIME(f)) { 963 fprintlog(f, flags, (char *)NULL); 964 BACKOFF(f); 965 } 966 } else { 967 /* new line, save it */ 968 if (f->f_prevcount) 969 fprintlog(f, 0, (char *)NULL); 970 f->f_repeatcount = 0; 971 f->f_prevpri = pri; 972 strlcpy(f->f_lasttime, timestamp, 973 sizeof(f->f_lasttime)); 974 strlcpy(f->f_prevhost, from, 975 sizeof(f->f_prevhost)); 976 if (msglen < MAXSVLINE) { 977 f->f_prevlen = msglen; 978 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 979 fprintlog(f, flags, (char *)NULL); 980 } else { 981 f->f_prevline[0] = 0; 982 f->f_prevlen = 0; 983 fprintlog(f, flags, msg); 984 } 985 } 986 } 987 sigsetmask(omask); 988 } 989 990 static void 991 dofsync(void) 992 { 993 struct filed *f; 994 995 for (f = Files; f; f = f->f_next) { 996 if ((f->f_type == F_FILE) && 997 (f->f_flags & FFLAG_NEEDSYNC)) { 998 f->f_flags &= ~FFLAG_NEEDSYNC; 999 fsync(f->f_file); 1000 } 1001 } 1002 } 1003 1004 static void 1005 fprintlog(struct filed *f, int flags, const char *msg) 1006 { 1007 struct iovec iov[7]; 1008 struct iovec *v; 1009 struct addrinfo *r; 1010 int i, l, lsent = 0; 1011 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1012 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1013 const char *msgret; 1014 1015 v = iov; 1016 if (f->f_type == F_WALL) { 1017 v->iov_base = greetings; 1018 v->iov_len = snprintf(greetings, sizeof greetings, 1019 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1020 f->f_prevhost, ctime(&now)); 1021 if (v->iov_len > 0) 1022 v++; 1023 v->iov_base = nul; 1024 v->iov_len = 0; 1025 v++; 1026 } else { 1027 v->iov_base = f->f_lasttime; 1028 v->iov_len = 15; 1029 v++; 1030 v->iov_base = space; 1031 v->iov_len = 1; 1032 v++; 1033 } 1034 1035 if (LogFacPri) { 1036 static char fp_buf[30]; /* Hollow laugh */ 1037 int fac = f->f_prevpri & LOG_FACMASK; 1038 int pri = LOG_PRI(f->f_prevpri); 1039 const char *f_s = NULL; 1040 char f_n[5]; /* Hollow laugh */ 1041 const char *p_s = NULL; 1042 char p_n[5]; /* Hollow laugh */ 1043 1044 if (LogFacPri > 1) { 1045 CODE *c; 1046 1047 for (c = facilitynames; c->c_name; c++) { 1048 if (c->c_val == fac) { 1049 f_s = c->c_name; 1050 break; 1051 } 1052 } 1053 for (c = prioritynames; c->c_name; c++) { 1054 if (c->c_val == pri) { 1055 p_s = c->c_name; 1056 break; 1057 } 1058 } 1059 } 1060 if (!f_s) { 1061 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1062 f_s = f_n; 1063 } 1064 if (!p_s) { 1065 snprintf(p_n, sizeof p_n, "%d", pri); 1066 p_s = p_n; 1067 } 1068 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1069 v->iov_base = fp_buf; 1070 v->iov_len = strlen(fp_buf); 1071 } else { 1072 v->iov_base = nul; 1073 v->iov_len = 0; 1074 } 1075 v++; 1076 1077 v->iov_base = f->f_prevhost; 1078 v->iov_len = strlen(v->iov_base); 1079 v++; 1080 v->iov_base = space; 1081 v->iov_len = 1; 1082 v++; 1083 1084 if (msg) { 1085 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1086 if (wmsg == NULL) { 1087 logerror("strdup"); 1088 exit(1); 1089 } 1090 v->iov_base = wmsg; 1091 v->iov_len = strlen(msg); 1092 } else if (f->f_prevcount > 1) { 1093 v->iov_base = repbuf; 1094 v->iov_len = snprintf(repbuf, sizeof repbuf, 1095 "last message repeated %d times", f->f_prevcount); 1096 } else { 1097 v->iov_base = f->f_prevline; 1098 v->iov_len = f->f_prevlen; 1099 } 1100 v++; 1101 1102 dprintf("Logging to %s", TypeNames[f->f_type]); 1103 f->f_time = now; 1104 1105 switch (f->f_type) { 1106 case F_UNUSED: 1107 dprintf("\n"); 1108 break; 1109 1110 case F_FORW: 1111 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1112 /* check for local vs remote messages */ 1113 if (strcasecmp(f->f_prevhost, LocalHostName)) 1114 l = snprintf(line, sizeof line - 1, 1115 "<%d>%.15s Forwarded from %s: %s", 1116 f->f_prevpri, (char *)iov[0].iov_base, 1117 f->f_prevhost, (char *)iov[5].iov_base); 1118 else 1119 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1120 f->f_prevpri, (char *)iov[0].iov_base, 1121 (char *)iov[5].iov_base); 1122 if (l < 0) 1123 l = 0; 1124 else if (l > MAXLINE) 1125 l = MAXLINE; 1126 1127 if (finet) { 1128 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1129 for (i = 0; i < *finet; i++) { 1130 #if 0 1131 /* 1132 * should we check AF first, or just 1133 * trial and error? FWD 1134 */ 1135 if (r->ai_family == 1136 address_family_of(finet[i+1])) 1137 #endif 1138 lsent = sendto(finet[i+1], line, l, 0, 1139 r->ai_addr, r->ai_addrlen); 1140 if (lsent == l) 1141 break; 1142 } 1143 if (lsent == l && !send_to_all) 1144 break; 1145 } 1146 dprintf("lsent/l: %d/%d\n", lsent, l); 1147 if (lsent != l) { 1148 int e = errno; 1149 logerror("sendto"); 1150 errno = e; 1151 switch (errno) { 1152 case EHOSTUNREACH: 1153 case EHOSTDOWN: 1154 break; 1155 /* case EBADF: */ 1156 /* case EACCES: */ 1157 /* case ENOTSOCK: */ 1158 /* case EFAULT: */ 1159 /* case EMSGSIZE: */ 1160 /* case EAGAIN: */ 1161 /* case ENOBUFS: */ 1162 /* case ECONNREFUSED: */ 1163 default: 1164 dprintf("removing entry\n"); 1165 f->f_type = F_UNUSED; 1166 break; 1167 } 1168 } 1169 } 1170 break; 1171 1172 case F_FILE: 1173 dprintf(" %s\n", f->f_un.f_fname); 1174 v->iov_base = lf; 1175 v->iov_len = 1; 1176 if (writev(f->f_file, iov, 7) < 0) { 1177 int e = errno; 1178 close(f->f_file); 1179 f->f_type = F_UNUSED; 1180 errno = e; 1181 logerror(f->f_un.f_fname); 1182 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1183 f->f_flags |= FFLAG_NEEDSYNC; 1184 needdofsync = 1; 1185 } 1186 break; 1187 1188 case F_RING: 1189 dprintf(" %s\n", f->f_un.f_ring.f_rname); 1190 v->iov_base = "\n"; 1191 v->iov_len = 1; 1192 if (rbwritev(f, iov, 7) == -1) { 1193 int e = errno; 1194 munmap(f->f_un.f_ring.f_footer, 1195 sizeof(struct clog_footer)); 1196 close(f->f_file); 1197 f->f_type = F_UNUSED; 1198 errno = e; 1199 logerror(f->f_un.f_fname); 1200 } 1201 break; 1202 1203 case F_PIPE: 1204 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1205 v->iov_base = lf; 1206 v->iov_len = 1; 1207 if (f->f_un.f_pipe.f_pid == 0) { 1208 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1209 &f->f_un.f_pipe.f_pid)) < 0) { 1210 f->f_type = F_UNUSED; 1211 logerror(f->f_un.f_pipe.f_pname); 1212 break; 1213 } 1214 } 1215 if (writev(f->f_file, iov, 7) < 0) { 1216 int e = errno; 1217 close(f->f_file); 1218 if (f->f_un.f_pipe.f_pid > 0) 1219 deadq_enter(f->f_un.f_pipe.f_pid, 1220 f->f_un.f_pipe.f_pname); 1221 f->f_un.f_pipe.f_pid = 0; 1222 errno = e; 1223 logerror(f->f_un.f_pipe.f_pname); 1224 } 1225 break; 1226 1227 case F_CONSOLE: 1228 if (flags & IGN_CONS) { 1229 dprintf(" (ignored)\n"); 1230 break; 1231 } 1232 /* FALLTHROUGH */ 1233 1234 case F_TTY: 1235 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1236 v->iov_base = crlf; 1237 v->iov_len = 2; 1238 1239 errno = 0; /* ttymsg() only sometimes returns an errno */ 1240 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1241 f->f_type = F_UNUSED; 1242 logerror(msgret); 1243 } 1244 break; 1245 1246 case F_USERS: 1247 case F_WALL: 1248 dprintf("\n"); 1249 v->iov_base = crlf; 1250 v->iov_len = 2; 1251 wallmsg(f, iov); 1252 break; 1253 } 1254 f->f_prevcount = 0; 1255 if (msg) 1256 free(wmsg); 1257 } 1258 1259 /* 1260 * WALLMSG -- Write a message to the world at large 1261 * 1262 * Write the specified message to either the entire 1263 * world, or a list of approved users. 1264 */ 1265 static void 1266 wallmsg(struct filed *f, struct iovec *iov) 1267 { 1268 static int reenter; /* avoid calling ourselves */ 1269 FILE *uf; 1270 struct utmp ut; 1271 int i; 1272 const char *p; 1273 char line[sizeof(ut.ut_line) + 1]; 1274 1275 if (reenter++) 1276 return; 1277 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1278 logerror(_PATH_UTMP); 1279 reenter = 0; 1280 return; 1281 } 1282 /* NOSTRICT */ 1283 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1284 if (ut.ut_name[0] == '\0') 1285 continue; 1286 /* We must use strncpy since ut_* may not be NUL terminated. */ 1287 strncpy(line, ut.ut_line, sizeof(line) - 1); 1288 line[sizeof(line) - 1] = '\0'; 1289 if (f->f_type == F_WALL) { 1290 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1291 errno = 0; /* already in msg */ 1292 logerror(p); 1293 } 1294 continue; 1295 } 1296 /* should we send the message to this user? */ 1297 for (i = 0; i < MAXUNAMES; i++) { 1298 if (!f->f_un.f_uname[i][0]) 1299 break; 1300 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1301 UT_NAMESIZE)) { 1302 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1303 != NULL) { 1304 errno = 0; /* already in msg */ 1305 logerror(p); 1306 } 1307 break; 1308 } 1309 } 1310 } 1311 fclose(uf); 1312 reenter = 0; 1313 } 1314 1315 static void 1316 reapchild(int signo __unused) 1317 { 1318 int status; 1319 pid_t pid; 1320 struct filed *f; 1321 1322 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1323 if (!Initialized) 1324 /* Don't tell while we are initting. */ 1325 continue; 1326 1327 /* First, look if it's a process from the dead queue. */ 1328 if (deadq_remove(pid)) 1329 goto oncemore; 1330 1331 /* Now, look in list of active processes. */ 1332 for (f = Files; f; f = f->f_next) 1333 if (f->f_type == F_PIPE && 1334 f->f_un.f_pipe.f_pid == pid) { 1335 close(f->f_file); 1336 f->f_un.f_pipe.f_pid = 0; 1337 log_deadchild(pid, status, 1338 f->f_un.f_pipe.f_pname); 1339 break; 1340 } 1341 oncemore: 1342 continue; 1343 } 1344 } 1345 1346 /* 1347 * Return a printable representation of a host address. 1348 */ 1349 static const char * 1350 cvthname(struct sockaddr *f) 1351 { 1352 int error, hl; 1353 sigset_t omask, nmask; 1354 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1355 1356 error = getnameinfo((struct sockaddr *)f, 1357 ((struct sockaddr *)f)->sa_len, 1358 ip, sizeof ip, NULL, 0, 1359 NI_NUMERICHOST | withscopeid); 1360 dprintf("cvthname(%s)\n", ip); 1361 1362 if (error) { 1363 dprintf("Malformed from address %s\n", gai_strerror(error)); 1364 return ("???"); 1365 } 1366 if (!resolve) 1367 return (ip); 1368 1369 sigemptyset(&nmask); 1370 sigaddset(&nmask, SIGHUP); 1371 sigprocmask(SIG_BLOCK, &nmask, &omask); 1372 error = getnameinfo((struct sockaddr *)f, 1373 ((struct sockaddr *)f)->sa_len, 1374 hname, sizeof hname, NULL, 0, 1375 NI_NAMEREQD | withscopeid); 1376 sigprocmask(SIG_SETMASK, &omask, NULL); 1377 if (error) { 1378 dprintf("Host name for your address (%s) unknown\n", ip); 1379 return (ip); 1380 } 1381 hl = strlen(hname); 1382 if (hl > 0 && hname[hl-1] == '.') 1383 hname[--hl] = '\0'; 1384 trimdomain(hname, hl); 1385 return (hname); 1386 } 1387 1388 static void 1389 dodie(int signo) 1390 { 1391 1392 WantDie = signo; 1393 } 1394 1395 static void 1396 domark(int signo __unused) 1397 { 1398 1399 MarkSet = 1; 1400 } 1401 1402 /* 1403 * Print syslogd errors some place. 1404 */ 1405 static void 1406 logerror(const char *type) 1407 { 1408 char buf[512]; 1409 static int recursed = 0; 1410 1411 /* If there's an error while trying to log an error, give up. */ 1412 if (recursed) 1413 return; 1414 recursed++; 1415 if (errno) 1416 snprintf(buf, 1417 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1418 else 1419 snprintf(buf, sizeof buf, "syslogd: %s", type); 1420 errno = 0; 1421 dprintf("%s\n", buf); 1422 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1423 recursed--; 1424 } 1425 1426 static void 1427 die(int signo) 1428 { 1429 struct filed *f; 1430 int was_initialized; 1431 char buf[100]; 1432 int i; 1433 1434 was_initialized = Initialized; 1435 Initialized = 0; /* Don't log SIGCHLDs. */ 1436 for (f = Files; f != NULL; f = f->f_next) { 1437 /* flush any pending output */ 1438 if (f->f_prevcount) 1439 fprintlog(f, 0, (char *)NULL); 1440 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1441 close(f->f_file); 1442 f->f_un.f_pipe.f_pid = 0; 1443 } 1444 } 1445 Initialized = was_initialized; 1446 if (signo) { 1447 dprintf("syslogd: exiting on signal %d\n", signo); 1448 snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1449 errno = 0; 1450 logerror(buf); 1451 } 1452 for (i = 0; i < nfunix; i++) 1453 if (funixn[i] && funix[i] != -1) 1454 unlink(funixn[i]); 1455 exit(1); 1456 } 1457 1458 /* 1459 * INIT -- Initialize syslogd from configuration table 1460 */ 1461 static void 1462 init(int signo) 1463 { 1464 int i; 1465 FILE *cf; 1466 struct filed *f, *next, **nextp; 1467 char *p; 1468 char cline[LINE_MAX]; 1469 char prog[NAME_MAX+1]; 1470 char host[MAXHOSTNAMELEN]; 1471 char oldLocalHostName[MAXHOSTNAMELEN]; 1472 char hostMsg[2*MAXHOSTNAMELEN+40]; 1473 char bootfileMsg[LINE_MAX]; 1474 1475 dprintf("init\n"); 1476 1477 /* 1478 * Load hostname (may have changed). 1479 */ 1480 if (signo != 0) 1481 strlcpy(oldLocalHostName, LocalHostName, 1482 sizeof(oldLocalHostName)); 1483 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1484 err(EX_OSERR, "gethostname() failed"); 1485 if ((p = strchr(LocalHostName, '.')) != NULL) { 1486 *p++ = '\0'; 1487 LocalDomain = p; 1488 } else { 1489 LocalDomain = ""; 1490 } 1491 1492 /* 1493 * Close all open log files. 1494 */ 1495 Initialized = 0; 1496 for (f = Files; f != NULL; f = next) { 1497 /* flush any pending output */ 1498 if (f->f_prevcount) 1499 fprintlog(f, 0, (char *)NULL); 1500 1501 switch (f->f_type) { 1502 case F_FILE: 1503 case F_FORW: 1504 case F_CONSOLE: 1505 case F_TTY: 1506 close(f->f_file); 1507 break; 1508 case F_PIPE: 1509 if (f->f_un.f_pipe.f_pid > 0) { 1510 close(f->f_file); 1511 deadq_enter(f->f_un.f_pipe.f_pid, 1512 f->f_un.f_pipe.f_pname); 1513 } 1514 f->f_un.f_pipe.f_pid = 0; 1515 break; 1516 case F_RING: 1517 munmap(f->f_un.f_ring.f_footer, 1518 sizeof(struct clog_footer)); 1519 close(f->f_file); 1520 break; 1521 } 1522 next = f->f_next; 1523 if (f->f_program) free(f->f_program); 1524 if (f->f_host) free(f->f_host); 1525 free((char *)f); 1526 } 1527 Files = NULL; 1528 nextp = &Files; 1529 1530 /* open the configuration file */ 1531 if ((cf = fopen(ConfFile, "r")) == NULL) { 1532 dprintf("cannot open %s\n", ConfFile); 1533 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1534 if (*nextp == NULL) { 1535 logerror("calloc"); 1536 exit(1); 1537 } 1538 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1539 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1540 if ((*nextp)->f_next == NULL) { 1541 logerror("calloc"); 1542 exit(1); 1543 } 1544 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1545 Initialized = 1; 1546 return; 1547 } 1548 1549 /* 1550 * Foreach line in the conf table, open that file. 1551 */ 1552 f = NULL; 1553 strlcpy(host, "*", sizeof(host)); 1554 strlcpy(prog, "*", sizeof(prog)); 1555 while (fgets(cline, sizeof(cline), cf) != NULL) { 1556 /* 1557 * check for end-of-section, comments, strip off trailing 1558 * spaces and newline character. #!prog is treated specially: 1559 * following lines apply only to that program. 1560 */ 1561 for (p = cline; isspace(*p); ++p) 1562 continue; 1563 if (*p == 0) 1564 continue; 1565 if (*p == '#') { 1566 p++; 1567 if (*p != '!' && *p != '+' && *p != '-') 1568 continue; 1569 } 1570 if (*p == '+' || *p == '-') { 1571 host[0] = *p++; 1572 while (isspace(*p)) 1573 p++; 1574 if ((!*p) || (*p == '*')) { 1575 strlcpy(host, "*", sizeof(host)); 1576 continue; 1577 } 1578 if (*p == '@') 1579 p = LocalHostName; 1580 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1581 if (!isalnum(*p) && *p != '.' && *p != '-' 1582 && *p != ',') 1583 break; 1584 host[i] = *p++; 1585 } 1586 host[i] = '\0'; 1587 continue; 1588 } 1589 if (*p == '!') { 1590 p++; 1591 while (isspace(*p)) p++; 1592 if ((!*p) || (*p == '*')) { 1593 strlcpy(prog, "*", sizeof(prog)); 1594 continue; 1595 } 1596 for (i = 0; i < NAME_MAX; i++) { 1597 if (!isprint(p[i])) 1598 break; 1599 prog[i] = p[i]; 1600 } 1601 prog[i] = 0; 1602 continue; 1603 } 1604 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1605 cline[i] = '\0'; 1606 f = (struct filed *)calloc(1, sizeof(*f)); 1607 if (f == NULL) { 1608 logerror("calloc"); 1609 exit(1); 1610 } 1611 *nextp = f; 1612 nextp = &f->f_next; 1613 cfline(cline, f, prog, host); 1614 } 1615 1616 /* close the configuration file */ 1617 fclose(cf); 1618 1619 Initialized = 1; 1620 1621 if (Debug) { 1622 for (f = Files; f; f = f->f_next) { 1623 for (i = 0; i <= LOG_NFACILITIES; i++) 1624 if (f->f_pmask[i] == INTERNAL_NOPRI) 1625 printf("X "); 1626 else 1627 printf("%d ", f->f_pmask[i]); 1628 printf("%s: ", TypeNames[f->f_type]); 1629 switch (f->f_type) { 1630 case F_FILE: 1631 printf("%s", f->f_un.f_fname); 1632 break; 1633 1634 case F_CONSOLE: 1635 case F_TTY: 1636 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1637 break; 1638 1639 case F_FORW: 1640 printf("%s", f->f_un.f_forw.f_hname); 1641 break; 1642 1643 case F_RING: 1644 printf("%s", f->f_un.f_ring.f_rname); 1645 break; 1646 1647 case F_PIPE: 1648 printf("%s", f->f_un.f_pipe.f_pname); 1649 break; 1650 1651 case F_USERS: 1652 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1653 printf("%s, ", f->f_un.f_uname[i]); 1654 break; 1655 } 1656 if (f->f_program) 1657 printf(" (%s)", f->f_program); 1658 printf("\n"); 1659 } 1660 } 1661 1662 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1663 dprintf("syslogd: restarted\n"); 1664 /* 1665 * Log a change in hostname, but only on a restart. 1666 */ 1667 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1668 snprintf(hostMsg, sizeof(hostMsg), 1669 "syslogd: hostname changed, \"%s\" to \"%s\"", 1670 oldLocalHostName, LocalHostName); 1671 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1672 dprintf("%s\n", hostMsg); 1673 } 1674 /* 1675 * Log the kernel boot file if we aren't going to use it as 1676 * the prefix, and if this is *not* a restart. 1677 */ 1678 if (signo == 0 && !use_bootfile) { 1679 snprintf(bootfileMsg, sizeof(bootfileMsg), 1680 "syslogd: kernel boot file is %s", bootfile); 1681 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1682 dprintf("%s\n", bootfileMsg); 1683 } 1684 } 1685 1686 /* 1687 * Crack a configuration file line 1688 */ 1689 static void 1690 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1691 { 1692 struct addrinfo hints, *res; 1693 int error, i, pri, syncfile; 1694 const char *p, *q; 1695 char *bp; 1696 char buf[MAXLINE], ebuf[100]; 1697 struct stat sb; 1698 1699 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1700 1701 errno = 0; /* keep strerror() stuff out of logerror messages */ 1702 1703 /* clear out file entry */ 1704 memset(f, 0, sizeof(*f)); 1705 for (i = 0; i <= LOG_NFACILITIES; i++) 1706 f->f_pmask[i] = INTERNAL_NOPRI; 1707 1708 /* save hostname if any */ 1709 if (host && *host == '*') 1710 host = NULL; 1711 if (host) { 1712 int hl; 1713 1714 f->f_host = strdup(host); 1715 if (f->f_host == NULL) { 1716 logerror("strdup"); 1717 exit(1); 1718 } 1719 hl = strlen(f->f_host); 1720 if (hl > 0 && f->f_host[hl-1] == '.') 1721 f->f_host[--hl] = '\0'; 1722 trimdomain(f->f_host, hl); 1723 } 1724 1725 /* save program name if any */ 1726 if (prog && *prog == '*') 1727 prog = NULL; 1728 if (prog) { 1729 f->f_program = strdup(prog); 1730 if (f->f_program == NULL) { 1731 logerror("strdup"); 1732 exit(1); 1733 } 1734 } 1735 1736 /* scan through the list of selectors */ 1737 for (p = line; *p && *p != '\t' && *p != ' ';) { 1738 int pri_done; 1739 int pri_cmp; 1740 int pri_invert; 1741 1742 /* find the end of this facility name list */ 1743 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1744 continue; 1745 1746 /* get the priority comparison */ 1747 pri_cmp = 0; 1748 pri_done = 0; 1749 pri_invert = 0; 1750 if (*q == '!') { 1751 pri_invert = 1; 1752 q++; 1753 } 1754 while (!pri_done) { 1755 switch (*q) { 1756 case '<': 1757 pri_cmp |= PRI_LT; 1758 q++; 1759 break; 1760 case '=': 1761 pri_cmp |= PRI_EQ; 1762 q++; 1763 break; 1764 case '>': 1765 pri_cmp |= PRI_GT; 1766 q++; 1767 break; 1768 default: 1769 pri_done++; 1770 break; 1771 } 1772 } 1773 1774 /* collect priority name */ 1775 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1776 *bp++ = *q++; 1777 *bp = '\0'; 1778 1779 /* skip cruft */ 1780 while (strchr(",;", *q)) 1781 q++; 1782 1783 /* decode priority name */ 1784 if (*buf == '*') { 1785 pri = LOG_PRIMASK + 1; 1786 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1787 } else { 1788 /* Ignore trailing spaces. */ 1789 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1790 buf[i] = '\0'; 1791 1792 pri = decode(buf, prioritynames); 1793 if (pri < 0) { 1794 snprintf(ebuf, sizeof ebuf, 1795 "unknown priority name \"%s\"", buf); 1796 logerror(ebuf); 1797 return; 1798 } 1799 } 1800 if (!pri_cmp) 1801 pri_cmp = (UniquePriority) 1802 ? (PRI_EQ) 1803 : (PRI_EQ | PRI_GT) 1804 ; 1805 if (pri_invert) 1806 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1807 1808 /* scan facilities */ 1809 while (*p && !strchr("\t.; ", *p)) { 1810 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1811 *bp++ = *p++; 1812 *bp = '\0'; 1813 1814 if (*buf == '*') { 1815 for (i = 0; i < LOG_NFACILITIES; i++) { 1816 f->f_pmask[i] = pri; 1817 f->f_pcmp[i] = pri_cmp; 1818 } 1819 } else { 1820 i = decode(buf, facilitynames); 1821 if (i < 0) { 1822 snprintf(ebuf, sizeof ebuf, 1823 "unknown facility name \"%s\"", 1824 buf); 1825 logerror(ebuf); 1826 return; 1827 } 1828 f->f_pmask[i >> 3] = pri; 1829 f->f_pcmp[i >> 3] = pri_cmp; 1830 } 1831 while (*p == ',' || *p == ' ') 1832 p++; 1833 } 1834 1835 p = q; 1836 } 1837 1838 /* skip to action part */ 1839 while (*p == '\t' || *p == ' ') 1840 p++; 1841 1842 if (*p == '-') { 1843 syncfile = 0; 1844 p++; 1845 } else 1846 syncfile = 1; 1847 1848 switch (*p) { 1849 case '@': 1850 strlcpy(f->f_un.f_forw.f_hname, ++p, 1851 sizeof(f->f_un.f_forw.f_hname)); 1852 memset(&hints, 0, sizeof(hints)); 1853 hints.ai_family = family; 1854 hints.ai_socktype = SOCK_DGRAM; 1855 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1856 &res); 1857 if (error) { 1858 logerror(gai_strerror(error)); 1859 break; 1860 } 1861 f->f_un.f_forw.f_addr = res; 1862 f->f_type = F_FORW; 1863 break; 1864 1865 case '/': 1866 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1867 f->f_type = F_UNUSED; 1868 logerror(p); 1869 break; 1870 } 1871 if (syncfile) 1872 f->f_flags |= FFLAG_SYNC; 1873 if (isatty(f->f_file)) { 1874 if (strcmp(p, ctty) == 0) 1875 f->f_type = F_CONSOLE; 1876 else 1877 f->f_type = F_TTY; 1878 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1879 sizeof(f->f_un.f_fname)); 1880 } else { 1881 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1882 f->f_type = F_FILE; 1883 } 1884 break; 1885 1886 case '%': 1887 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) { 1888 f->f_type = F_UNUSED; 1889 logerror(p + 1); 1890 break; 1891 } 1892 if (fstat(f->f_file,&sb) < 0) { 1893 close(f->f_file); 1894 f->f_type = F_UNUSED; 1895 logerror(p+1); 1896 break; 1897 } 1898 f->f_un.f_ring.f_footer = 1899 mmap(NULL, sizeof(struct clog_footer), 1900 PROT_READ|PROT_WRITE, MAP_SHARED, 1901 f->f_file, sb.st_size-sizeof(struct clog_footer)); 1902 if (f->f_un.f_ring.f_footer == NULL) { 1903 close(f->f_file); 1904 f->f_type = F_UNUSED; 1905 logerror(p + 1); 1906 break; 1907 } 1908 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) { 1909 munmap(f->f_un.f_ring.f_footer, 1910 sizeof(struct clog_footer)); 1911 close(f->f_file); 1912 f->f_type = F_UNUSED; 1913 errno = ENODEV; 1914 logerror(p + 1); 1915 break; 1916 } 1917 f->f_un.f_ring.f_size = sb.st_size; 1918 strcpy(f->f_un.f_ring.f_rname, p + 1); 1919 f->f_type = F_RING; 1920 break; 1921 1922 case '|': 1923 f->f_un.f_pipe.f_pid = 0; 1924 strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1925 f->f_type = F_PIPE; 1926 break; 1927 1928 case '*': 1929 f->f_type = F_WALL; 1930 break; 1931 1932 default: 1933 for (i = 0; i < MAXUNAMES && *p; i++) { 1934 for (q = p; *q && *q != ','; ) 1935 q++; 1936 strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1937 if ((q - p) > UT_NAMESIZE) 1938 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1939 else 1940 f->f_un.f_uname[i][q - p] = '\0'; 1941 while (*q == ',' || *q == ' ') 1942 q++; 1943 p = q; 1944 } 1945 f->f_type = F_USERS; 1946 break; 1947 } 1948 } 1949 1950 1951 /* 1952 * Decode a symbolic name to a numeric value 1953 */ 1954 static int 1955 decode(const char *name, CODE *codetab) 1956 { 1957 CODE *c; 1958 char *p, buf[40]; 1959 1960 if (isdigit(*name)) 1961 return (atoi(name)); 1962 1963 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1964 if (isupper(*name)) 1965 *p = tolower(*name); 1966 else 1967 *p = *name; 1968 } 1969 *p = '\0'; 1970 for (c = codetab; c->c_name; c++) 1971 if (!strcmp(buf, c->c_name)) 1972 return (c->c_val); 1973 1974 return (-1); 1975 } 1976 1977 static void 1978 markit(void) 1979 { 1980 struct filed *f; 1981 dq_t q, next; 1982 1983 now = time((time_t *)NULL); 1984 MarkSeq += TIMERINTVL; 1985 if (MarkSeq >= MarkInterval) { 1986 logmsg(LOG_INFO, "-- MARK --", 1987 LocalHostName, ADDDATE|MARK); 1988 MarkSeq = 0; 1989 } 1990 1991 for (f = Files; f; f = f->f_next) { 1992 if (f->f_prevcount && now >= REPEATTIME(f)) { 1993 dprintf("flush %s: repeated %d times, %d sec.\n", 1994 TypeNames[f->f_type], f->f_prevcount, 1995 repeatinterval[f->f_repeatcount]); 1996 fprintlog(f, 0, (char *)NULL); 1997 BACKOFF(f); 1998 } 1999 } 2000 2001 /* Walk the dead queue, and see if we should signal somebody. */ 2002 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2003 next = TAILQ_NEXT(q, dq_entries); 2004 2005 switch (q->dq_timeout) { 2006 case 0: 2007 /* Already signalled once, try harder now. */ 2008 if (kill(q->dq_pid, SIGKILL) != 0) 2009 deadq_remove(q->dq_pid); 2010 break; 2011 2012 case 1: 2013 /* 2014 * Timed out on dead queue, send terminate 2015 * signal. Note that we leave the removal 2016 * from the dead queue to reapchild(), which 2017 * will also log the event (unless the process 2018 * didn't even really exist, in case we simply 2019 * drop it from the dead queue). 2020 */ 2021 if (kill(q->dq_pid, SIGTERM) != 0) 2022 deadq_remove(q->dq_pid); 2023 /* FALLTHROUGH */ 2024 2025 default: 2026 q->dq_timeout--; 2027 } 2028 } 2029 MarkSet = 0; 2030 alarm(TIMERINTVL); 2031 } 2032 2033 /* 2034 * fork off and become a daemon, but wait for the child to come online 2035 * before returing to the parent, or we get disk thrashing at boot etc. 2036 * Set a timer so we don't hang forever if it wedges. 2037 */ 2038 static int 2039 waitdaemon(int nochdir, int noclose, int maxwait) 2040 { 2041 int fd; 2042 int status; 2043 pid_t pid, childpid; 2044 2045 switch (childpid = fork()) { 2046 case -1: 2047 return (-1); 2048 case 0: 2049 break; 2050 default: 2051 signal(SIGALRM, timedout); 2052 alarm(maxwait); 2053 while ((pid = wait3(&status, 0, NULL)) != -1) { 2054 if (WIFEXITED(status)) 2055 errx(1, "child pid %d exited with return code %d", 2056 pid, WEXITSTATUS(status)); 2057 if (WIFSIGNALED(status)) 2058 errx(1, "child pid %d exited on signal %d%s", 2059 pid, WTERMSIG(status), 2060 WCOREDUMP(status) ? " (core dumped)" : 2061 ""); 2062 if (pid == childpid) /* it's gone... */ 2063 break; 2064 } 2065 exit(0); 2066 } 2067 2068 if (setsid() == -1) 2069 return (-1); 2070 2071 if (!nochdir) 2072 chdir("/"); 2073 2074 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2075 dup2(fd, STDIN_FILENO); 2076 dup2(fd, STDOUT_FILENO); 2077 dup2(fd, STDERR_FILENO); 2078 if (fd > 2) 2079 close (fd); 2080 } 2081 return (getppid()); 2082 } 2083 2084 /* 2085 * We get a SIGALRM from the child when it's running and finished doing it's 2086 * fsync()'s or O_SYNC writes for all the boot messages. 2087 * 2088 * We also get a signal from the kernel if the timer expires, so check to 2089 * see what happened. 2090 */ 2091 static void 2092 timedout(int sig __unused) 2093 { 2094 int left; 2095 left = alarm(0); 2096 signal(SIGALRM, SIG_DFL); 2097 if (left == 0) 2098 errx(1, "timed out waiting for child"); 2099 else 2100 _exit(0); 2101 } 2102 2103 /* 2104 * Add `s' to the list of allowable peer addresses to accept messages 2105 * from. 2106 * 2107 * `s' is a string in the form: 2108 * 2109 * [*]domainname[:{servicename|portnumber|*}] 2110 * 2111 * or 2112 * 2113 * netaddr/maskbits[:{servicename|portnumber|*}] 2114 * 2115 * Returns -1 on error, 0 if the argument was valid. 2116 */ 2117 static int 2118 allowaddr(char *s) 2119 { 2120 char *cp1, *cp2; 2121 struct allowedpeer ap; 2122 struct servent *se; 2123 int masklen = -1, i; 2124 struct addrinfo hints, *res; 2125 struct in_addr *addrp, *maskp; 2126 u_int32_t *addr6p, *mask6p; 2127 char ip[NI_MAXHOST]; 2128 2129 #ifdef INET6 2130 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2131 #endif 2132 cp1 = s; 2133 if ((cp1 = strrchr(cp1, ':'))) { 2134 /* service/port provided */ 2135 *cp1++ = '\0'; 2136 if (strlen(cp1) == 1 && *cp1 == '*') 2137 /* any port allowed */ 2138 ap.port = 0; 2139 else if ((se = getservbyname(cp1, "udp"))) { 2140 ap.port = ntohs(se->s_port); 2141 } else { 2142 ap.port = strtol(cp1, &cp2, 0); 2143 if (*cp2 != '\0') 2144 return (-1); /* port not numeric */ 2145 } 2146 } else { 2147 if ((se = getservbyname("syslog", "udp"))) 2148 ap.port = ntohs(se->s_port); 2149 else 2150 /* sanity, should not happen */ 2151 ap.port = 514; 2152 } 2153 2154 if ((cp1 = strchr(s, '/')) != NULL && 2155 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2156 *cp1 = '\0'; 2157 if ((masklen = atoi(cp1 + 1)) < 0) 2158 return (-1); 2159 } 2160 #ifdef INET6 2161 if (*s == '[') { 2162 cp2 = s + strlen(s) - 1; 2163 if (*cp2 == ']') { 2164 ++s; 2165 *cp2 = '\0'; 2166 } else { 2167 cp2 = NULL; 2168 } 2169 } else { 2170 cp2 = NULL; 2171 } 2172 #endif 2173 memset(&hints, 0, sizeof(hints)); 2174 hints.ai_family = PF_UNSPEC; 2175 hints.ai_socktype = SOCK_DGRAM; 2176 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2177 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2178 ap.isnumeric = 1; 2179 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2180 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2181 ap.a_mask.ss_family = res->ai_family; 2182 if (res->ai_family == AF_INET) { 2183 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2184 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2185 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2186 if (masklen < 0) { 2187 /* use default netmask */ 2188 if (IN_CLASSA(ntohl(addrp->s_addr))) 2189 maskp->s_addr = htonl(IN_CLASSA_NET); 2190 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2191 maskp->s_addr = htonl(IN_CLASSB_NET); 2192 else 2193 maskp->s_addr = htonl(IN_CLASSC_NET); 2194 } else if (masklen <= 32) { 2195 /* convert masklen to netmask */ 2196 if (masklen == 0) 2197 maskp->s_addr = 0; 2198 else 2199 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2200 } else { 2201 freeaddrinfo(res); 2202 return (-1); 2203 } 2204 /* Lose any host bits in the network number. */ 2205 addrp->s_addr &= maskp->s_addr; 2206 } 2207 #ifdef INET6 2208 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2209 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2210 if (masklen < 0) 2211 masklen = 128; 2212 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2213 /* convert masklen to netmask */ 2214 while (masklen > 0) { 2215 if (masklen < 32) { 2216 *mask6p = htonl(~(0xffffffff >> masklen)); 2217 break; 2218 } 2219 *mask6p++ = 0xffffffff; 2220 masklen -= 32; 2221 } 2222 /* Lose any host bits in the network number. */ 2223 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2224 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2225 for (i = 0; i < 4; i++) 2226 addr6p[i] &= mask6p[i]; 2227 } 2228 #endif 2229 else { 2230 freeaddrinfo(res); 2231 return (-1); 2232 } 2233 freeaddrinfo(res); 2234 } else { 2235 /* arg `s' is domain name */ 2236 ap.isnumeric = 0; 2237 ap.a_name = s; 2238 if (cp1) 2239 *cp1 = '/'; 2240 #ifdef INET6 2241 if (cp2) { 2242 *cp2 = ']'; 2243 --s; 2244 } 2245 #endif 2246 } 2247 2248 if (Debug) { 2249 printf("allowaddr: rule %d: ", NumAllowed); 2250 if (ap.isnumeric) { 2251 printf("numeric, "); 2252 getnameinfo((struct sockaddr *)&ap.a_addr, 2253 ((struct sockaddr *)&ap.a_addr)->sa_len, 2254 ip, sizeof ip, NULL, 0, 2255 NI_NUMERICHOST | withscopeid); 2256 printf("addr = %s, ", ip); 2257 getnameinfo((struct sockaddr *)&ap.a_mask, 2258 ((struct sockaddr *)&ap.a_mask)->sa_len, 2259 ip, sizeof ip, NULL, 0, 2260 NI_NUMERICHOST | withscopeid); 2261 printf("mask = %s; ", ip); 2262 } else { 2263 printf("domainname = %s; ", ap.a_name); 2264 } 2265 printf("port = %d\n", ap.port); 2266 } 2267 2268 if ((AllowedPeers = realloc(AllowedPeers, 2269 ++NumAllowed * sizeof(struct allowedpeer))) 2270 == NULL) { 2271 logerror("realloc"); 2272 exit(1); 2273 } 2274 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2275 return (0); 2276 } 2277 2278 /* 2279 * Validate that the remote peer has permission to log to us. 2280 */ 2281 static int 2282 validate(struct sockaddr *sa, const char *hname) 2283 { 2284 int i, j, reject; 2285 size_t l1, l2; 2286 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2287 struct allowedpeer *ap; 2288 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2289 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2290 struct addrinfo hints, *res; 2291 u_short sport; 2292 2293 if (NumAllowed == 0) 2294 /* traditional behaviour, allow everything */ 2295 return (1); 2296 2297 strlcpy(name, hname, sizeof(name)); 2298 memset(&hints, 0, sizeof(hints)); 2299 hints.ai_family = PF_UNSPEC; 2300 hints.ai_socktype = SOCK_DGRAM; 2301 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2302 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2303 freeaddrinfo(res); 2304 else if (strchr(name, '.') == NULL) { 2305 strlcat(name, ".", sizeof name); 2306 strlcat(name, LocalDomain, sizeof name); 2307 } 2308 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2309 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2310 return (0); /* for safety, should not occur */ 2311 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2312 ip, port, name); 2313 sport = atoi(port); 2314 2315 /* now, walk down the list */ 2316 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2317 if (ap->port != 0 && ap->port != sport) { 2318 dprintf("rejected in rule %d due to port mismatch.\n", i); 2319 continue; 2320 } 2321 2322 if (ap->isnumeric) { 2323 if (ap->a_addr.ss_family != sa->sa_family) { 2324 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2325 continue; 2326 } 2327 if (ap->a_addr.ss_family == AF_INET) { 2328 sin4 = (struct sockaddr_in *)sa; 2329 a4p = (struct sockaddr_in *)&ap->a_addr; 2330 m4p = (struct sockaddr_in *)&ap->a_mask; 2331 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2332 != a4p->sin_addr.s_addr) { 2333 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2334 continue; 2335 } 2336 } 2337 #ifdef INET6 2338 else if (ap->a_addr.ss_family == AF_INET6) { 2339 sin6 = (struct sockaddr_in6 *)sa; 2340 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2341 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2342 #ifdef NI_WITHSCOPEID 2343 if (a6p->sin6_scope_id != 0 && 2344 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2345 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2346 continue; 2347 } 2348 #endif 2349 reject = 0; 2350 for (j = 0; j < 16; j += 4) { 2351 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2352 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2353 ++reject; 2354 break; 2355 } 2356 } 2357 if (reject) { 2358 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2359 continue; 2360 } 2361 } 2362 #endif 2363 else 2364 continue; 2365 } else { 2366 cp = ap->a_name; 2367 l1 = strlen(name); 2368 if (*cp == '*') { 2369 /* allow wildmatch */ 2370 cp++; 2371 l2 = strlen(cp); 2372 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2373 dprintf("rejected in rule %d due to name mismatch.\n", i); 2374 continue; 2375 } 2376 } else { 2377 /* exact match */ 2378 l2 = strlen(cp); 2379 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2380 dprintf("rejected in rule %d due to name mismatch.\n", i); 2381 continue; 2382 } 2383 } 2384 } 2385 dprintf("accepted in rule %d.\n", i); 2386 return (1); /* hooray! */ 2387 } 2388 return (0); 2389 } 2390 2391 /* 2392 * Fairly similar to popen(3), but returns an open descriptor, as 2393 * opposed to a FILE *. 2394 */ 2395 static int 2396 p_open(const char *prog, pid_t *rpid) 2397 { 2398 int pfd[2], nulldesc, i; 2399 pid_t pid; 2400 sigset_t omask, mask; 2401 char *argv[4]; /* sh -c cmd NULL */ 2402 char errmsg[200]; 2403 2404 if (pipe(pfd) == -1) 2405 return (-1); 2406 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2407 /* we are royally screwed anyway */ 2408 return (-1); 2409 2410 sigemptyset(&mask); 2411 sigaddset(&mask, SIGALRM); 2412 sigaddset(&mask, SIGHUP); 2413 sigprocmask(SIG_BLOCK, &mask, &omask); 2414 switch ((pid = fork())) { 2415 case -1: 2416 sigprocmask(SIG_SETMASK, &omask, 0); 2417 close(nulldesc); 2418 return (-1); 2419 2420 case 0: 2421 argv[0] = strdup("sh"); 2422 argv[1] = strdup("-c"); 2423 argv[2] = strdup(prog); 2424 argv[3] = NULL; 2425 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2426 logerror("strdup"); 2427 exit(1); 2428 } 2429 2430 alarm(0); 2431 setsid(); /* Avoid catching SIGHUPs. */ 2432 2433 /* 2434 * Throw away pending signals, and reset signal 2435 * behaviour to standard values. 2436 */ 2437 signal(SIGALRM, SIG_IGN); 2438 signal(SIGHUP, SIG_IGN); 2439 sigprocmask(SIG_SETMASK, &omask, 0); 2440 signal(SIGPIPE, SIG_DFL); 2441 signal(SIGQUIT, SIG_DFL); 2442 signal(SIGALRM, SIG_DFL); 2443 signal(SIGHUP, SIG_DFL); 2444 2445 dup2(pfd[0], STDIN_FILENO); 2446 dup2(nulldesc, STDOUT_FILENO); 2447 dup2(nulldesc, STDERR_FILENO); 2448 for (i = getdtablesize(); i > 2; i--) 2449 close(i); 2450 2451 execvp(_PATH_BSHELL, argv); 2452 _exit(255); 2453 } 2454 2455 sigprocmask(SIG_SETMASK, &omask, 0); 2456 close(nulldesc); 2457 close(pfd[0]); 2458 /* 2459 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2460 * supposed to get an EWOULDBLOCK on writev(2), which is 2461 * caught by the logic above anyway, which will in turn close 2462 * the pipe, and fork a new logging subprocess if necessary. 2463 * The stale subprocess will be killed some time later unless 2464 * it terminated itself due to closing its input pipe (so we 2465 * get rid of really dead puppies). 2466 */ 2467 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2468 /* This is bad. */ 2469 snprintf(errmsg, sizeof errmsg, 2470 "Warning: cannot change pipe to PID %d to " 2471 "non-blocking behaviour.", 2472 (int)pid); 2473 logerror(errmsg); 2474 } 2475 *rpid = pid; 2476 return (pfd[1]); 2477 } 2478 2479 static void 2480 deadq_enter(pid_t pid, const char *name) 2481 { 2482 dq_t p; 2483 int status; 2484 2485 /* 2486 * Be paranoid, if we can't signal the process, don't enter it 2487 * into the dead queue (perhaps it's already dead). If possible, 2488 * we try to fetch and log the child's status. 2489 */ 2490 if (kill(pid, 0) != 0) { 2491 if (waitpid(pid, &status, WNOHANG) > 0) 2492 log_deadchild(pid, status, name); 2493 return; 2494 } 2495 2496 p = malloc(sizeof(struct deadq_entry)); 2497 if (p == NULL) { 2498 logerror("malloc"); 2499 exit(1); 2500 } 2501 2502 p->dq_pid = pid; 2503 p->dq_timeout = DQ_TIMO_INIT; 2504 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2505 } 2506 2507 static int 2508 deadq_remove(pid_t pid) 2509 { 2510 dq_t q; 2511 2512 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2513 if (q->dq_pid == pid) { 2514 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2515 free(q); 2516 return (1); 2517 } 2518 } 2519 2520 return (0); 2521 } 2522 2523 static void 2524 log_deadchild(pid_t pid, int status, const char *name) 2525 { 2526 int code; 2527 char buf[256]; 2528 const char *reason; 2529 2530 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2531 if (WIFSIGNALED(status)) { 2532 reason = "due to signal"; 2533 code = WTERMSIG(status); 2534 } else { 2535 reason = "with status"; 2536 code = WEXITSTATUS(status); 2537 if (code == 0) 2538 return; 2539 } 2540 snprintf(buf, sizeof buf, 2541 "Logging subprocess %d (%s) exited %s %d.", 2542 pid, name, reason, code); 2543 logerror(buf); 2544 } 2545 2546 static int * 2547 socksetup(int af, const char *bindhostname) 2548 { 2549 struct addrinfo hints, *res, *r; 2550 int error, maxs, *s, *socks; 2551 2552 memset(&hints, 0, sizeof(hints)); 2553 hints.ai_flags = AI_PASSIVE; 2554 hints.ai_family = af; 2555 hints.ai_socktype = SOCK_DGRAM; 2556 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2557 if (error) { 2558 logerror(gai_strerror(error)); 2559 errno = 0; 2560 die(0); 2561 } 2562 2563 /* Count max number of sockets we may open */ 2564 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2565 socks = malloc((maxs+1) * sizeof(int)); 2566 if (socks == NULL) { 2567 logerror("couldn't allocate memory for sockets"); 2568 die(0); 2569 } 2570 2571 *socks = 0; /* num of sockets counter at start of array */ 2572 s = socks + 1; 2573 for (r = res; r; r = r->ai_next) { 2574 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2575 if (*s < 0) { 2576 logerror("socket"); 2577 continue; 2578 } 2579 if (r->ai_socktype != SOCK_STREAM) 2580 setsockbuffer(*s); 2581 if (r->ai_family == AF_INET6) { 2582 int on = 1; 2583 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2584 (char *)&on, sizeof (on)) < 0) { 2585 logerror("setsockopt"); 2586 close(*s); 2587 continue; 2588 } 2589 } 2590 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2591 close(*s); 2592 logerror("bind"); 2593 continue; 2594 } 2595 2596 (*socks)++; 2597 s++; 2598 } 2599 2600 if (*socks == 0) { 2601 free(socks); 2602 if (Debug) 2603 return (NULL); 2604 else 2605 die(0); 2606 } 2607 if (res) 2608 freeaddrinfo(res); 2609 2610 return (socks); 2611 } 2612 2613 /* 2614 * Most systems default to a fairly small amount of receive buffer space, 2615 * set a reasonable buffer size. 2616 */ 2617 static 2618 void 2619 setsockbuffer(int fd) 2620 { 2621 int bytes = 65536; 2622 2623 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bytes, sizeof(bytes)); 2624 } 2625 2626 ssize_t 2627 rbwritev(struct filed *f, struct iovec *iov, int iovcnt) 2628 { 2629 int i; 2630 ssize_t out = 0; 2631 ssize_t error; 2632 2633 for (i = 0; i < iovcnt; i++) { 2634 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len); 2635 if (error == -1) 2636 return (-1); 2637 out += error; 2638 } 2639 return (out); 2640 } 2641 2642 2643 ssize_t 2644 rbwrite(struct filed *f, char *buf, size_t nbytes) 2645 { 2646 size_t maxwrite; 2647 ssize_t error; 2648 ssize_t out; 2649 2650 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2651 f->f_un.f_ring.f_footer->cf_next; 2652 out = 0; 2653 2654 f->f_un.f_ring.f_footer->cf_lock = 1; 2655 while (nbytes > 0) { 2656 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2657 f->f_un.f_ring.f_footer->cf_next; 2658 if (maxwrite > nbytes) 2659 maxwrite = nbytes; 2660 error = pwrite(f->f_file, buf, maxwrite, 2661 f->f_un.f_ring.f_footer->cf_next); 2662 if (error == -1) { 2663 f->f_un.f_ring.f_footer->cf_lock = 0; 2664 return (-1); 2665 } 2666 nbytes -= error; 2667 out += error; 2668 buf += error; 2669 f->f_un.f_ring.f_footer->cf_next += error; 2670 if (f->f_un.f_ring.f_footer->cf_next == 2671 f->f_un.f_ring.f_footer->cf_max) { 2672 f->f_un.f_ring.f_footer->cf_next = 0; 2673 f->f_un.f_ring.f_footer->cf_wrap = 1; 2674 } 2675 2676 } 2677 2678 f->f_un.f_ring.f_footer->cf_lock = 0; 2679 return (out); 2680 } 2681