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 1.5 2004/12/18 22:48:14 swildner 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 init(int); 315 static void logerror(const char *); 316 static void logmsg(int, const char *, const char *, int); 317 static void log_deadchild(pid_t, int, const char *); 318 static void markit(void); 319 static int skip_message(const char *, const char *, int); 320 static void printline(const char *, char *); 321 static void printsys(char *); 322 static int p_open(const char *, pid_t *); 323 ssize_t rbwrite(struct filed *, char *, size_t); 324 ssize_t rbwritev(struct filed *, struct iovec *, int); 325 static void readklog(void); 326 static void reapchild(int); 327 static void usage(void); 328 static int validate(struct sockaddr *, const char *); 329 static void unmapped(struct sockaddr *); 330 static void wallmsg(struct filed *, struct iovec *); 331 static int waitdaemon(int, int, int); 332 static void timedout(int); 333 334 int 335 main(int argc, char *argv[]) 336 { 337 int ch, i, fdsrmax = 0, l; 338 struct sockaddr_un sunx, fromunix; 339 struct sockaddr_storage frominet; 340 fd_set *fdsr = NULL; 341 FILE *fp; 342 char line[MAXLINE + 1]; 343 const char *bindhostname, *hname; 344 struct timeval tv, *tvp; 345 struct sigaction sact; 346 sigset_t mask; 347 pid_t ppid = 1; 348 socklen_t len; 349 350 bindhostname = NULL; 351 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 352 switch (ch) { 353 case '4': 354 family = PF_INET; 355 break; 356 #ifdef INET6 357 case '6': 358 family = PF_INET6; 359 break; 360 #endif 361 case 'A': 362 send_to_all++; 363 break; 364 case 'a': /* allow specific network addresses only */ 365 if (allowaddr(optarg) == -1) 366 usage(); 367 break; 368 case 'b': 369 bindhostname = optarg; 370 break; 371 case 'c': 372 no_compress++; 373 break; 374 case 'd': /* debug */ 375 Debug++; 376 break; 377 case 'f': /* configuration file */ 378 ConfFile = optarg; 379 break; 380 case 'k': /* keep remote kern fac */ 381 KeepKernFac = 1; 382 break; 383 case 'l': 384 if (strlen(optarg) >= sizeof(sunx.sun_path)) 385 errx(1, "%s path too long, exiting", optarg); 386 if (nfunix < MAXFUNIX) 387 funixn[nfunix++] = optarg; 388 else 389 warnx("out of descriptors, ignoring %s", 390 optarg); 391 break; 392 case 'm': /* mark interval */ 393 MarkInterval = atoi(optarg) * 60; 394 break; 395 case 'n': 396 resolve = 0; 397 break; 398 case 'o': 399 use_bootfile = 1; 400 break; 401 case 'p': /* path */ 402 if (strlen(optarg) >= sizeof(sunx.sun_path)) 403 errx(1, "%s path too long, exiting", optarg); 404 funixn[0] = optarg; 405 break; 406 case 'P': /* path for alt. PID */ 407 PidFile = optarg; 408 break; 409 case 's': /* no network mode */ 410 SecureMode++; 411 break; 412 case 'u': /* only log specified priority */ 413 UniquePriority++; 414 break; 415 case 'v': /* log facility and priority */ 416 LogFacPri++; 417 break; 418 default: 419 usage(); 420 } 421 if ((argc -= optind) != 0) 422 usage(); 423 424 if (!Debug) { 425 ppid = waitdaemon(0, 0, 30); 426 if (ppid < 0) 427 err(1, "could not become daemon"); 428 } else { 429 setlinebuf(stdout); 430 } 431 432 if (NumAllowed) 433 endservent(); 434 435 consfile.f_type = F_CONSOLE; 436 strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 437 sizeof(consfile.f_un.f_fname)); 438 strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 439 signal(SIGTERM, dodie); 440 signal(SIGINT, Debug ? dodie : SIG_IGN); 441 signal(SIGQUIT, Debug ? dodie : SIG_IGN); 442 /* 443 * We don't want the SIGCHLD and SIGHUP handlers to interfere 444 * with each other; they are likely candidates for being called 445 * simultaneously (SIGHUP closes pipe descriptor, process dies, 446 * SIGCHLD happens). 447 */ 448 sigemptyset(&mask); 449 sigaddset(&mask, SIGHUP); 450 sact.sa_handler = reapchild; 451 sact.sa_mask = mask; 452 sact.sa_flags = SA_RESTART; 453 sigaction(SIGCHLD, &sact, NULL); 454 signal(SIGALRM, domark); 455 signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 456 alarm(TIMERINTVL); 457 458 TAILQ_INIT(&deadq_head); 459 460 #ifndef SUN_LEN 461 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 462 #endif 463 for (i = 0; i < nfunix; i++) { 464 unlink(funixn[i]); 465 memset(&sunx, 0, sizeof(sunx)); 466 sunx.sun_family = AF_UNIX; 467 strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 468 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 469 if (funix[i] < 0 || 470 bind(funix[i], (struct sockaddr *)&sunx, 471 SUN_LEN(&sunx)) < 0 || 472 chmod(funixn[i], 0666) < 0) { 473 snprintf(line, sizeof line, 474 "cannot create %s", funixn[i]); 475 logerror(line); 476 dprintf("cannot create %s (%d)\n", funixn[i], errno); 477 if (i == 0) 478 die(0); 479 } 480 } 481 if (SecureMode <= 1) 482 finet = socksetup(family, bindhostname); 483 484 if (finet) { 485 if (SecureMode) { 486 for (i = 0; i < *finet; i++) { 487 if (shutdown(finet[i+1], SHUT_RD) < 0) { 488 logerror("shutdown"); 489 if (!Debug) 490 die(0); 491 } 492 } 493 } else { 494 dprintf("listening on inet and/or inet6 socket\n"); 495 } 496 dprintf("sending on inet and/or inet6 socket\n"); 497 } 498 499 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 500 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 501 fklog = -1; 502 if (fklog < 0) 503 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 504 505 /* tuck my process id away */ 506 fp = fopen(PidFile, "w"); 507 if (fp != NULL) { 508 fprintf(fp, "%d\n", getpid()); 509 fclose(fp); 510 } 511 512 dprintf("off & running....\n"); 513 514 init(0); 515 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 516 sigemptyset(&mask); 517 sigaddset(&mask, SIGCHLD); 518 sact.sa_handler = init; 519 sact.sa_mask = mask; 520 sact.sa_flags = SA_RESTART; 521 sigaction(SIGHUP, &sact, NULL); 522 523 tvp = &tv; 524 tv.tv_sec = tv.tv_usec = 0; 525 526 if (fklog != -1 && fklog > fdsrmax) 527 fdsrmax = fklog; 528 if (finet && !SecureMode) { 529 for (i = 0; i < *finet; i++) { 530 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 531 fdsrmax = finet[i+1]; 532 } 533 } 534 for (i = 0; i < nfunix; i++) { 535 if (funix[i] != -1 && funix[i] > fdsrmax) 536 fdsrmax = funix[i]; 537 } 538 539 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 540 sizeof(fd_mask)); 541 if (fdsr == NULL) 542 errx(1, "calloc fd_set"); 543 544 for (;;) { 545 if (MarkSet) 546 markit(); 547 if (WantDie) 548 die(WantDie); 549 550 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 551 sizeof(fd_mask)); 552 553 if (fklog != -1) 554 FD_SET(fklog, fdsr); 555 if (finet && !SecureMode) { 556 for (i = 0; i < *finet; i++) { 557 if (finet[i+1] != -1) 558 FD_SET(finet[i+1], fdsr); 559 } 560 } 561 for (i = 0; i < nfunix; i++) { 562 if (funix[i] != -1) 563 FD_SET(funix[i], fdsr); 564 } 565 566 i = select(fdsrmax+1, fdsr, NULL, NULL, 567 needdofsync ? &tv : tvp); 568 switch (i) { 569 case 0: 570 dofsync(); 571 needdofsync = 0; 572 if (tvp) { 573 tvp = NULL; 574 if (ppid != 1) 575 kill(ppid, SIGALRM); 576 } 577 continue; 578 case -1: 579 if (errno != EINTR) 580 logerror("select"); 581 continue; 582 } 583 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 584 readklog(); 585 if (finet && !SecureMode) { 586 for (i = 0; i < *finet; i++) { 587 if (FD_ISSET(finet[i+1], fdsr)) { 588 len = sizeof(frominet); 589 l = recvfrom(finet[i+1], line, MAXLINE, 590 0, (struct sockaddr *)&frominet, 591 &len); 592 if (l > 0) { 593 line[l] = '\0'; 594 hname = cvthname((struct sockaddr *)&frominet); 595 unmapped((struct sockaddr *)&frominet); 596 if (validate((struct sockaddr *)&frominet, hname)) 597 printline(hname, line); 598 } else if (l < 0 && errno != EINTR) 599 logerror("recvfrom inet"); 600 } 601 } 602 } 603 for (i = 0; i < nfunix; i++) { 604 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 605 len = sizeof(fromunix); 606 l = recvfrom(funix[i], line, MAXLINE, 0, 607 (struct sockaddr *)&fromunix, &len); 608 if (l > 0) { 609 line[l] = '\0'; 610 printline(LocalHostName, line); 611 } else if (l < 0 && errno != EINTR) 612 logerror("recvfrom unix"); 613 } 614 } 615 } 616 if (fdsr) 617 free(fdsr); 618 } 619 620 static void 621 unmapped(struct sockaddr *sa) 622 { 623 struct sockaddr_in6 *sin6; 624 struct sockaddr_in sin4; 625 626 if (sa->sa_family != AF_INET6) 627 return; 628 if (sa->sa_len != sizeof(struct sockaddr_in6) || 629 sizeof(sin4) > sa->sa_len) 630 return; 631 sin6 = (struct sockaddr_in6 *)sa; 632 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 633 return; 634 635 memset(&sin4, 0, sizeof(sin4)); 636 sin4.sin_family = AF_INET; 637 sin4.sin_len = sizeof(struct sockaddr_in); 638 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 639 sizeof(sin4.sin_addr)); 640 sin4.sin_port = sin6->sin6_port; 641 642 memcpy(sa, &sin4, sin4.sin_len); 643 } 644 645 static void 646 usage(void) 647 { 648 649 fprintf(stderr, "%s\n%s\n%s\n%s\n", 650 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 651 " [-b bind address] [-f config_file]", 652 " [-l log_socket] [-m mark_interval]", 653 " [-P pid_file] [-p log_socket]"); 654 exit(1); 655 } 656 657 /* 658 * Take a raw input line, decode the message, and print the message 659 * on the appropriate log files. 660 */ 661 static void 662 printline(const char *hname, char *msg) 663 { 664 char *p, *q; 665 long n; 666 int c, pri; 667 char line[MAXLINE + 1]; 668 669 /* test for special codes */ 670 p = msg; 671 pri = DEFUPRI; 672 if (*p == '<') { 673 errno = 0; 674 n = strtol(p + 1, &q, 10); 675 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 676 p = q + 1; 677 pri = n; 678 } 679 } 680 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 681 pri = DEFUPRI; 682 683 /* 684 * Don't allow users to log kernel messages. 685 * NOTE: since LOG_KERN == 0 this will also match 686 * messages with no facility specified. 687 */ 688 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 689 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 690 691 q = line; 692 693 while ((c = (unsigned char)*p++) != '\0' && 694 q < &line[sizeof(line) - 4]) { 695 if ((c & 0x80) && c < 0xA0) { 696 c &= 0x7F; 697 *q++ = 'M'; 698 *q++ = '-'; 699 } 700 if (isascii(c) && iscntrl(c)) { 701 if (c == '\n') { 702 *q++ = ' '; 703 } else if (c == '\t') { 704 *q++ = '\t'; 705 } else { 706 *q++ = '^'; 707 *q++ = c ^ 0100; 708 } 709 } else { 710 *q++ = c; 711 } 712 } 713 *q = '\0'; 714 715 logmsg(pri, line, hname, 0); 716 } 717 718 /* 719 * Read /dev/klog while data are available, split into lines. 720 */ 721 static void 722 readklog(void) 723 { 724 char *p, *q, line[MAXLINE + 1]; 725 int len, i; 726 727 len = 0; 728 for (;;) { 729 i = read(fklog, line + len, MAXLINE - 1 - len); 730 if (i > 0) { 731 line[i + len] = '\0'; 732 } else { 733 if (i < 0 && errno != EINTR && errno != EAGAIN) { 734 logerror("klog"); 735 fklog = -1; 736 } 737 break; 738 } 739 740 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 741 *q = '\0'; 742 printsys(p); 743 } 744 len = strlen(p); 745 if (len >= MAXLINE - 1) { 746 printsys(p); 747 len = 0; 748 } 749 if (len > 0) 750 memmove(line, p, len + 1); 751 } 752 if (len > 0) 753 printsys(line); 754 } 755 756 /* 757 * Take a raw input line from /dev/klog, format similar to syslog(). 758 */ 759 static void 760 printsys(char *msg) 761 { 762 char *p, *q; 763 long n; 764 int flags, isprintf, pri; 765 766 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 767 p = msg; 768 pri = DEFSPRI; 769 isprintf = 1; 770 if (*p == '<') { 771 errno = 0; 772 n = strtol(p + 1, &q, 10); 773 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 774 p = q + 1; 775 pri = n; 776 isprintf = 0; 777 } 778 } 779 /* 780 * Kernel printf's and LOG_CONSOLE messages have been displayed 781 * on the console already. 782 */ 783 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 784 flags |= IGN_CONS; 785 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 786 pri = DEFSPRI; 787 logmsg(pri, p, LocalHostName, flags); 788 } 789 790 static time_t now; 791 792 /* 793 * Match a program or host name against a specification. 794 * Return a non-0 value if the message must be ignored 795 * based on the specification. 796 */ 797 static int 798 skip_message(const char *name, const char *spec, int checkcase) { 799 const char *s; 800 char prev, next; 801 int exclude = 0; 802 /* Behaviour on explicit match */ 803 804 if (spec == NULL) 805 return 0; 806 switch (*spec) { 807 case '-': 808 exclude = 1; 809 /*FALLTHROUGH*/ 810 case '+': 811 spec++; 812 break; 813 default: 814 break; 815 } 816 if (checkcase) 817 s = strstr (spec, name); 818 else 819 s = strcasestr (spec, name); 820 821 if (s != NULL) { 822 prev = (s == spec ? ',' : *(s - 1)); 823 next = *(s + strlen (name)); 824 825 if (prev == ',' && (next == '\0' || next == ',')) 826 /* Explicit match: skip iff the spec is an 827 exclusive one. */ 828 return exclude; 829 } 830 831 /* No explicit match for this name: skip the message iff 832 the spec is an inclusive one. */ 833 return !exclude; 834 } 835 836 /* 837 * Log a message to the appropriate log files, users, etc. based on 838 * the priority. 839 */ 840 static void 841 logmsg(int pri, const char *msg, const char *from, int flags) 842 { 843 struct filed *f; 844 int i, fac, msglen, omask, prilev; 845 const char *timestamp; 846 char prog[NAME_MAX+1]; 847 char buf[MAXLINE+1]; 848 849 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 850 pri, flags, from, msg); 851 852 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 853 854 /* 855 * Check to see if msg looks non-standard. 856 */ 857 msglen = strlen(msg); 858 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 859 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 860 flags |= ADDDATE; 861 862 time(&now); 863 if (flags & ADDDATE) { 864 timestamp = ctime(&now) + 4; 865 } else { 866 timestamp = msg; 867 msg += 16; 868 msglen -= 16; 869 } 870 871 /* skip leading blanks */ 872 while (isspace(*msg)) { 873 msg++; 874 msglen--; 875 } 876 877 /* extract facility and priority level */ 878 if (flags & MARK) 879 fac = LOG_NFACILITIES; 880 else 881 fac = LOG_FAC(pri); 882 prilev = LOG_PRI(pri); 883 884 /* extract program name */ 885 for (i = 0; i < NAME_MAX; i++) { 886 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 887 msg[i] == '/') 888 break; 889 prog[i] = msg[i]; 890 } 891 prog[i] = 0; 892 893 /* add kernel prefix for kernel messages */ 894 if (flags & ISKERNEL) { 895 snprintf(buf, sizeof(buf), "%s: %s", 896 use_bootfile ? bootfile : "kernel", msg); 897 msg = buf; 898 msglen = strlen(buf); 899 } 900 901 /* log the message to the particular outputs */ 902 if (!Initialized) { 903 f = &consfile; 904 f->f_file = open(ctty, O_WRONLY, 0); 905 906 if (f->f_file >= 0) { 907 strlcpy(f->f_lasttime, timestamp, 908 sizeof(f->f_lasttime)); 909 fprintlog(f, flags, msg); 910 close(f->f_file); 911 } 912 sigsetmask(omask); 913 return; 914 } 915 for (f = Files; f; f = f->f_next) { 916 /* skip messages that are incorrect priority */ 917 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 918 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 919 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 920 ) 921 || f->f_pmask[fac] == INTERNAL_NOPRI) 922 continue; 923 924 /* skip messages with the incorrect hostname */ 925 if (skip_message(from, f->f_host, 0)) 926 continue; 927 928 /* skip messages with the incorrect program name */ 929 if (skip_message(prog, f->f_program, 1)) 930 continue; 931 932 /* skip message to console if it has already been printed */ 933 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 934 continue; 935 936 /* don't output marks to recently written files */ 937 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 938 continue; 939 940 /* 941 * suppress duplicate lines to this file 942 */ 943 if (no_compress - (f->f_type != F_PIPE) < 1 && 944 (flags & MARK) == 0 && msglen == f->f_prevlen && 945 !strcmp(msg, f->f_prevline) && 946 !strcasecmp(from, f->f_prevhost)) { 947 strlcpy(f->f_lasttime, timestamp, 948 sizeof(f->f_lasttime)); 949 f->f_prevcount++; 950 dprintf("msg repeated %d times, %ld sec of %d\n", 951 f->f_prevcount, (long)(now - f->f_time), 952 repeatinterval[f->f_repeatcount]); 953 /* 954 * If domark would have logged this by now, 955 * flush it now (so we don't hold isolated messages), 956 * but back off so we'll flush less often 957 * in the future. 958 */ 959 if (now > REPEATTIME(f)) { 960 fprintlog(f, flags, (char *)NULL); 961 BACKOFF(f); 962 } 963 } else { 964 /* new line, save it */ 965 if (f->f_prevcount) 966 fprintlog(f, 0, (char *)NULL); 967 f->f_repeatcount = 0; 968 f->f_prevpri = pri; 969 strlcpy(f->f_lasttime, timestamp, 970 sizeof(f->f_lasttime)); 971 strlcpy(f->f_prevhost, from, 972 sizeof(f->f_prevhost)); 973 if (msglen < MAXSVLINE) { 974 f->f_prevlen = msglen; 975 strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 976 fprintlog(f, flags, (char *)NULL); 977 } else { 978 f->f_prevline[0] = 0; 979 f->f_prevlen = 0; 980 fprintlog(f, flags, msg); 981 } 982 } 983 } 984 sigsetmask(omask); 985 } 986 987 static void 988 dofsync(void) 989 { 990 struct filed *f; 991 992 for (f = Files; f; f = f->f_next) { 993 if ((f->f_type == F_FILE) && 994 (f->f_flags & FFLAG_NEEDSYNC)) { 995 f->f_flags &= ~FFLAG_NEEDSYNC; 996 fsync(f->f_file); 997 } 998 } 999 } 1000 1001 static void 1002 fprintlog(struct filed *f, int flags, const char *msg) 1003 { 1004 struct iovec iov[7]; 1005 struct iovec *v; 1006 struct addrinfo *r; 1007 int i, l, lsent = 0; 1008 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1009 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1010 const char *msgret; 1011 1012 v = iov; 1013 if (f->f_type == F_WALL) { 1014 v->iov_base = greetings; 1015 v->iov_len = snprintf(greetings, sizeof greetings, 1016 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1017 f->f_prevhost, ctime(&now)); 1018 if (v->iov_len > 0) 1019 v++; 1020 v->iov_base = nul; 1021 v->iov_len = 0; 1022 v++; 1023 } else { 1024 v->iov_base = f->f_lasttime; 1025 v->iov_len = 15; 1026 v++; 1027 v->iov_base = space; 1028 v->iov_len = 1; 1029 v++; 1030 } 1031 1032 if (LogFacPri) { 1033 static char fp_buf[30]; /* Hollow laugh */ 1034 int fac = f->f_prevpri & LOG_FACMASK; 1035 int pri = LOG_PRI(f->f_prevpri); 1036 const char *f_s = NULL; 1037 char f_n[5]; /* Hollow laugh */ 1038 const char *p_s = NULL; 1039 char p_n[5]; /* Hollow laugh */ 1040 1041 if (LogFacPri > 1) { 1042 CODE *c; 1043 1044 for (c = facilitynames; c->c_name; c++) { 1045 if (c->c_val == fac) { 1046 f_s = c->c_name; 1047 break; 1048 } 1049 } 1050 for (c = prioritynames; c->c_name; c++) { 1051 if (c->c_val == pri) { 1052 p_s = c->c_name; 1053 break; 1054 } 1055 } 1056 } 1057 if (!f_s) { 1058 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1059 f_s = f_n; 1060 } 1061 if (!p_s) { 1062 snprintf(p_n, sizeof p_n, "%d", pri); 1063 p_s = p_n; 1064 } 1065 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1066 v->iov_base = fp_buf; 1067 v->iov_len = strlen(fp_buf); 1068 } else { 1069 v->iov_base = nul; 1070 v->iov_len = 0; 1071 } 1072 v++; 1073 1074 v->iov_base = f->f_prevhost; 1075 v->iov_len = strlen(v->iov_base); 1076 v++; 1077 v->iov_base = space; 1078 v->iov_len = 1; 1079 v++; 1080 1081 if (msg) { 1082 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1083 if (wmsg == NULL) { 1084 logerror("strdup"); 1085 exit(1); 1086 } 1087 v->iov_base = wmsg; 1088 v->iov_len = strlen(msg); 1089 } else if (f->f_prevcount > 1) { 1090 v->iov_base = repbuf; 1091 v->iov_len = snprintf(repbuf, sizeof repbuf, 1092 "last message repeated %d times", f->f_prevcount); 1093 } else { 1094 v->iov_base = f->f_prevline; 1095 v->iov_len = f->f_prevlen; 1096 } 1097 v++; 1098 1099 dprintf("Logging to %s", TypeNames[f->f_type]); 1100 f->f_time = now; 1101 1102 switch (f->f_type) { 1103 case F_UNUSED: 1104 dprintf("\n"); 1105 break; 1106 1107 case F_FORW: 1108 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1109 /* check for local vs remote messages */ 1110 if (strcasecmp(f->f_prevhost, LocalHostName)) 1111 l = snprintf(line, sizeof line - 1, 1112 "<%d>%.15s Forwarded from %s: %s", 1113 f->f_prevpri, (char *)iov[0].iov_base, 1114 f->f_prevhost, (char *)iov[5].iov_base); 1115 else 1116 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1117 f->f_prevpri, (char *)iov[0].iov_base, 1118 (char *)iov[5].iov_base); 1119 if (l < 0) 1120 l = 0; 1121 else if (l > MAXLINE) 1122 l = MAXLINE; 1123 1124 if (finet) { 1125 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1126 for (i = 0; i < *finet; i++) { 1127 #if 0 1128 /* 1129 * should we check AF first, or just 1130 * trial and error? FWD 1131 */ 1132 if (r->ai_family == 1133 address_family_of(finet[i+1])) 1134 #endif 1135 lsent = sendto(finet[i+1], line, l, 0, 1136 r->ai_addr, r->ai_addrlen); 1137 if (lsent == l) 1138 break; 1139 } 1140 if (lsent == l && !send_to_all) 1141 break; 1142 } 1143 dprintf("lsent/l: %d/%d\n", lsent, l); 1144 if (lsent != l) { 1145 int e = errno; 1146 logerror("sendto"); 1147 errno = e; 1148 switch (errno) { 1149 case EHOSTUNREACH: 1150 case EHOSTDOWN: 1151 break; 1152 /* case EBADF: */ 1153 /* case EACCES: */ 1154 /* case ENOTSOCK: */ 1155 /* case EFAULT: */ 1156 /* case EMSGSIZE: */ 1157 /* case EAGAIN: */ 1158 /* case ENOBUFS: */ 1159 /* case ECONNREFUSED: */ 1160 default: 1161 dprintf("removing entry\n"); 1162 f->f_type = F_UNUSED; 1163 break; 1164 } 1165 } 1166 } 1167 break; 1168 1169 case F_FILE: 1170 dprintf(" %s\n", f->f_un.f_fname); 1171 v->iov_base = lf; 1172 v->iov_len = 1; 1173 if (writev(f->f_file, iov, 7) < 0) { 1174 int e = errno; 1175 close(f->f_file); 1176 f->f_type = F_UNUSED; 1177 errno = e; 1178 logerror(f->f_un.f_fname); 1179 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1180 f->f_flags |= FFLAG_NEEDSYNC; 1181 needdofsync = 1; 1182 } 1183 break; 1184 1185 case F_RING: 1186 dprintf(" %s\n", f->f_un.f_ring.f_rname); 1187 v->iov_base = "\n"; 1188 v->iov_len = 1; 1189 if (rbwritev(f, iov, 7) == -1) { 1190 int e = errno; 1191 munmap(f->f_un.f_ring.f_footer, 1192 sizeof(struct clog_footer)); 1193 close(f->f_file); 1194 f->f_type = F_UNUSED; 1195 errno = e; 1196 logerror(f->f_un.f_fname); 1197 } 1198 break; 1199 1200 case F_PIPE: 1201 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1202 v->iov_base = lf; 1203 v->iov_len = 1; 1204 if (f->f_un.f_pipe.f_pid == 0) { 1205 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1206 &f->f_un.f_pipe.f_pid)) < 0) { 1207 f->f_type = F_UNUSED; 1208 logerror(f->f_un.f_pipe.f_pname); 1209 break; 1210 } 1211 } 1212 if (writev(f->f_file, iov, 7) < 0) { 1213 int e = errno; 1214 close(f->f_file); 1215 if (f->f_un.f_pipe.f_pid > 0) 1216 deadq_enter(f->f_un.f_pipe.f_pid, 1217 f->f_un.f_pipe.f_pname); 1218 f->f_un.f_pipe.f_pid = 0; 1219 errno = e; 1220 logerror(f->f_un.f_pipe.f_pname); 1221 } 1222 break; 1223 1224 case F_CONSOLE: 1225 if (flags & IGN_CONS) { 1226 dprintf(" (ignored)\n"); 1227 break; 1228 } 1229 /* FALLTHROUGH */ 1230 1231 case F_TTY: 1232 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1233 v->iov_base = crlf; 1234 v->iov_len = 2; 1235 1236 errno = 0; /* ttymsg() only sometimes returns an errno */ 1237 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1238 f->f_type = F_UNUSED; 1239 logerror(msgret); 1240 } 1241 break; 1242 1243 case F_USERS: 1244 case F_WALL: 1245 dprintf("\n"); 1246 v->iov_base = crlf; 1247 v->iov_len = 2; 1248 wallmsg(f, iov); 1249 break; 1250 } 1251 f->f_prevcount = 0; 1252 if (msg) 1253 free(wmsg); 1254 } 1255 1256 /* 1257 * WALLMSG -- Write a message to the world at large 1258 * 1259 * Write the specified message to either the entire 1260 * world, or a list of approved users. 1261 */ 1262 static void 1263 wallmsg(struct filed *f, struct iovec *iov) 1264 { 1265 static int reenter; /* avoid calling ourselves */ 1266 FILE *uf; 1267 struct utmp ut; 1268 int i; 1269 const char *p; 1270 char line[sizeof(ut.ut_line) + 1]; 1271 1272 if (reenter++) 1273 return; 1274 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1275 logerror(_PATH_UTMP); 1276 reenter = 0; 1277 return; 1278 } 1279 /* NOSTRICT */ 1280 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1281 if (ut.ut_name[0] == '\0') 1282 continue; 1283 /* We must use strncpy since ut_* may not be NUL terminated. */ 1284 strncpy(line, ut.ut_line, sizeof(line) - 1); 1285 line[sizeof(line) - 1] = '\0'; 1286 if (f->f_type == F_WALL) { 1287 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1288 errno = 0; /* already in msg */ 1289 logerror(p); 1290 } 1291 continue; 1292 } 1293 /* should we send the message to this user? */ 1294 for (i = 0; i < MAXUNAMES; i++) { 1295 if (!f->f_un.f_uname[i][0]) 1296 break; 1297 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1298 UT_NAMESIZE)) { 1299 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1300 != NULL) { 1301 errno = 0; /* already in msg */ 1302 logerror(p); 1303 } 1304 break; 1305 } 1306 } 1307 } 1308 fclose(uf); 1309 reenter = 0; 1310 } 1311 1312 static void 1313 reapchild(int signo __unused) 1314 { 1315 int status; 1316 pid_t pid; 1317 struct filed *f; 1318 1319 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1320 if (!Initialized) 1321 /* Don't tell while we are initting. */ 1322 continue; 1323 1324 /* First, look if it's a process from the dead queue. */ 1325 if (deadq_remove(pid)) 1326 goto oncemore; 1327 1328 /* Now, look in list of active processes. */ 1329 for (f = Files; f; f = f->f_next) 1330 if (f->f_type == F_PIPE && 1331 f->f_un.f_pipe.f_pid == pid) { 1332 close(f->f_file); 1333 f->f_un.f_pipe.f_pid = 0; 1334 log_deadchild(pid, status, 1335 f->f_un.f_pipe.f_pname); 1336 break; 1337 } 1338 oncemore: 1339 continue; 1340 } 1341 } 1342 1343 /* 1344 * Return a printable representation of a host address. 1345 */ 1346 static const char * 1347 cvthname(struct sockaddr *f) 1348 { 1349 int error, hl; 1350 sigset_t omask, nmask; 1351 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1352 1353 error = getnameinfo((struct sockaddr *)f, 1354 ((struct sockaddr *)f)->sa_len, 1355 ip, sizeof ip, NULL, 0, 1356 NI_NUMERICHOST | withscopeid); 1357 dprintf("cvthname(%s)\n", ip); 1358 1359 if (error) { 1360 dprintf("Malformed from address %s\n", gai_strerror(error)); 1361 return ("???"); 1362 } 1363 if (!resolve) 1364 return (ip); 1365 1366 sigemptyset(&nmask); 1367 sigaddset(&nmask, SIGHUP); 1368 sigprocmask(SIG_BLOCK, &nmask, &omask); 1369 error = getnameinfo((struct sockaddr *)f, 1370 ((struct sockaddr *)f)->sa_len, 1371 hname, sizeof hname, NULL, 0, 1372 NI_NAMEREQD | withscopeid); 1373 sigprocmask(SIG_SETMASK, &omask, NULL); 1374 if (error) { 1375 dprintf("Host name for your address (%s) unknown\n", ip); 1376 return (ip); 1377 } 1378 hl = strlen(hname); 1379 if (hl > 0 && hname[hl-1] == '.') 1380 hname[--hl] = '\0'; 1381 trimdomain(hname, hl); 1382 return (hname); 1383 } 1384 1385 static void 1386 dodie(int signo) 1387 { 1388 1389 WantDie = signo; 1390 } 1391 1392 static void 1393 domark(int signo __unused) 1394 { 1395 1396 MarkSet = 1; 1397 } 1398 1399 /* 1400 * Print syslogd errors some place. 1401 */ 1402 static void 1403 logerror(const char *type) 1404 { 1405 char buf[512]; 1406 static int recursed = 0; 1407 1408 /* If there's an error while trying to log an error, give up. */ 1409 if (recursed) 1410 return; 1411 recursed++; 1412 if (errno) 1413 snprintf(buf, 1414 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1415 else 1416 snprintf(buf, sizeof buf, "syslogd: %s", type); 1417 errno = 0; 1418 dprintf("%s\n", buf); 1419 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1420 recursed--; 1421 } 1422 1423 static void 1424 die(int signo) 1425 { 1426 struct filed *f; 1427 int was_initialized; 1428 char buf[100]; 1429 int i; 1430 1431 was_initialized = Initialized; 1432 Initialized = 0; /* Don't log SIGCHLDs. */ 1433 for (f = Files; f != NULL; f = f->f_next) { 1434 /* flush any pending output */ 1435 if (f->f_prevcount) 1436 fprintlog(f, 0, (char *)NULL); 1437 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1438 close(f->f_file); 1439 f->f_un.f_pipe.f_pid = 0; 1440 } 1441 } 1442 Initialized = was_initialized; 1443 if (signo) { 1444 dprintf("syslogd: exiting on signal %d\n", signo); 1445 snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1446 errno = 0; 1447 logerror(buf); 1448 } 1449 for (i = 0; i < nfunix; i++) 1450 if (funixn[i] && funix[i] != -1) 1451 unlink(funixn[i]); 1452 exit(1); 1453 } 1454 1455 /* 1456 * INIT -- Initialize syslogd from configuration table 1457 */ 1458 static void 1459 init(int signo) 1460 { 1461 int i; 1462 FILE *cf; 1463 struct filed *f, *next, **nextp; 1464 char *p; 1465 char cline[LINE_MAX]; 1466 char prog[NAME_MAX+1]; 1467 char host[MAXHOSTNAMELEN]; 1468 char oldLocalHostName[MAXHOSTNAMELEN]; 1469 char hostMsg[2*MAXHOSTNAMELEN+40]; 1470 char bootfileMsg[LINE_MAX]; 1471 1472 dprintf("init\n"); 1473 1474 /* 1475 * Load hostname (may have changed). 1476 */ 1477 if (signo != 0) 1478 strlcpy(oldLocalHostName, LocalHostName, 1479 sizeof(oldLocalHostName)); 1480 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1481 err(EX_OSERR, "gethostname() failed"); 1482 if ((p = strchr(LocalHostName, '.')) != NULL) { 1483 *p++ = '\0'; 1484 LocalDomain = p; 1485 } else { 1486 LocalDomain = ""; 1487 } 1488 1489 /* 1490 * Close all open log files. 1491 */ 1492 Initialized = 0; 1493 for (f = Files; f != NULL; f = next) { 1494 /* flush any pending output */ 1495 if (f->f_prevcount) 1496 fprintlog(f, 0, (char *)NULL); 1497 1498 switch (f->f_type) { 1499 case F_FILE: 1500 case F_FORW: 1501 case F_CONSOLE: 1502 case F_TTY: 1503 close(f->f_file); 1504 break; 1505 case F_PIPE: 1506 if (f->f_un.f_pipe.f_pid > 0) { 1507 close(f->f_file); 1508 deadq_enter(f->f_un.f_pipe.f_pid, 1509 f->f_un.f_pipe.f_pname); 1510 } 1511 f->f_un.f_pipe.f_pid = 0; 1512 break; 1513 case F_RING: 1514 munmap(f->f_un.f_ring.f_footer, 1515 sizeof(struct clog_footer)); 1516 close(f->f_file); 1517 break; 1518 } 1519 next = f->f_next; 1520 if (f->f_program) free(f->f_program); 1521 if (f->f_host) free(f->f_host); 1522 free((char *)f); 1523 } 1524 Files = NULL; 1525 nextp = &Files; 1526 1527 /* open the configuration file */ 1528 if ((cf = fopen(ConfFile, "r")) == NULL) { 1529 dprintf("cannot open %s\n", ConfFile); 1530 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1531 if (*nextp == NULL) { 1532 logerror("calloc"); 1533 exit(1); 1534 } 1535 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1536 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1537 if ((*nextp)->f_next == NULL) { 1538 logerror("calloc"); 1539 exit(1); 1540 } 1541 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1542 Initialized = 1; 1543 return; 1544 } 1545 1546 /* 1547 * Foreach line in the conf table, open that file. 1548 */ 1549 f = NULL; 1550 strlcpy(host, "*", sizeof(host)); 1551 strlcpy(prog, "*", sizeof(prog)); 1552 while (fgets(cline, sizeof(cline), cf) != NULL) { 1553 /* 1554 * check for end-of-section, comments, strip off trailing 1555 * spaces and newline character. #!prog is treated specially: 1556 * following lines apply only to that program. 1557 */ 1558 for (p = cline; isspace(*p); ++p) 1559 continue; 1560 if (*p == 0) 1561 continue; 1562 if (*p == '#') { 1563 p++; 1564 if (*p != '!' && *p != '+' && *p != '-') 1565 continue; 1566 } 1567 if (*p == '+' || *p == '-') { 1568 host[0] = *p++; 1569 while (isspace(*p)) 1570 p++; 1571 if ((!*p) || (*p == '*')) { 1572 strlcpy(host, "*", sizeof(host)); 1573 continue; 1574 } 1575 if (*p == '@') 1576 p = LocalHostName; 1577 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1578 if (!isalnum(*p) && *p != '.' && *p != '-' 1579 && *p != ',') 1580 break; 1581 host[i] = *p++; 1582 } 1583 host[i] = '\0'; 1584 continue; 1585 } 1586 if (*p == '!') { 1587 p++; 1588 while (isspace(*p)) p++; 1589 if ((!*p) || (*p == '*')) { 1590 strlcpy(prog, "*", sizeof(prog)); 1591 continue; 1592 } 1593 for (i = 0; i < NAME_MAX; i++) { 1594 if (!isprint(p[i])) 1595 break; 1596 prog[i] = p[i]; 1597 } 1598 prog[i] = 0; 1599 continue; 1600 } 1601 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1602 cline[i] = '\0'; 1603 f = (struct filed *)calloc(1, sizeof(*f)); 1604 if (f == NULL) { 1605 logerror("calloc"); 1606 exit(1); 1607 } 1608 *nextp = f; 1609 nextp = &f->f_next; 1610 cfline(cline, f, prog, host); 1611 } 1612 1613 /* close the configuration file */ 1614 fclose(cf); 1615 1616 Initialized = 1; 1617 1618 if (Debug) { 1619 for (f = Files; f; f = f->f_next) { 1620 for (i = 0; i <= LOG_NFACILITIES; i++) 1621 if (f->f_pmask[i] == INTERNAL_NOPRI) 1622 printf("X "); 1623 else 1624 printf("%d ", f->f_pmask[i]); 1625 printf("%s: ", TypeNames[f->f_type]); 1626 switch (f->f_type) { 1627 case F_FILE: 1628 printf("%s", f->f_un.f_fname); 1629 break; 1630 1631 case F_CONSOLE: 1632 case F_TTY: 1633 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1634 break; 1635 1636 case F_FORW: 1637 printf("%s", f->f_un.f_forw.f_hname); 1638 break; 1639 1640 case F_RING: 1641 printf("%s", f->f_un.f_ring.f_rname); 1642 break; 1643 1644 case F_PIPE: 1645 printf("%s", f->f_un.f_pipe.f_pname); 1646 break; 1647 1648 case F_USERS: 1649 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1650 printf("%s, ", f->f_un.f_uname[i]); 1651 break; 1652 } 1653 if (f->f_program) 1654 printf(" (%s)", f->f_program); 1655 printf("\n"); 1656 } 1657 } 1658 1659 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1660 dprintf("syslogd: restarted\n"); 1661 /* 1662 * Log a change in hostname, but only on a restart. 1663 */ 1664 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1665 snprintf(hostMsg, sizeof(hostMsg), 1666 "syslogd: hostname changed, \"%s\" to \"%s\"", 1667 oldLocalHostName, LocalHostName); 1668 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1669 dprintf("%s\n", hostMsg); 1670 } 1671 /* 1672 * Log the kernel boot file if we aren't going to use it as 1673 * the prefix, and if this is *not* a restart. 1674 */ 1675 if (signo == 0 && !use_bootfile) { 1676 snprintf(bootfileMsg, sizeof(bootfileMsg), 1677 "syslogd: kernel boot file is %s", bootfile); 1678 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1679 dprintf("%s\n", bootfileMsg); 1680 } 1681 } 1682 1683 /* 1684 * Crack a configuration file line 1685 */ 1686 static void 1687 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1688 { 1689 struct addrinfo hints, *res; 1690 int error, i, pri, syncfile; 1691 const char *p, *q; 1692 char *bp; 1693 char buf[MAXLINE], ebuf[100]; 1694 struct stat sb; 1695 1696 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1697 1698 errno = 0; /* keep strerror() stuff out of logerror messages */ 1699 1700 /* clear out file entry */ 1701 memset(f, 0, sizeof(*f)); 1702 for (i = 0; i <= LOG_NFACILITIES; i++) 1703 f->f_pmask[i] = INTERNAL_NOPRI; 1704 1705 /* save hostname if any */ 1706 if (host && *host == '*') 1707 host = NULL; 1708 if (host) { 1709 int hl; 1710 1711 f->f_host = strdup(host); 1712 if (f->f_host == NULL) { 1713 logerror("strdup"); 1714 exit(1); 1715 } 1716 hl = strlen(f->f_host); 1717 if (hl > 0 && f->f_host[hl-1] == '.') 1718 f->f_host[--hl] = '\0'; 1719 trimdomain(f->f_host, hl); 1720 } 1721 1722 /* save program name if any */ 1723 if (prog && *prog == '*') 1724 prog = NULL; 1725 if (prog) { 1726 f->f_program = strdup(prog); 1727 if (f->f_program == NULL) { 1728 logerror("strdup"); 1729 exit(1); 1730 } 1731 } 1732 1733 /* scan through the list of selectors */ 1734 for (p = line; *p && *p != '\t' && *p != ' ';) { 1735 int pri_done; 1736 int pri_cmp; 1737 int pri_invert; 1738 1739 /* find the end of this facility name list */ 1740 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1741 continue; 1742 1743 /* get the priority comparison */ 1744 pri_cmp = 0; 1745 pri_done = 0; 1746 pri_invert = 0; 1747 if (*q == '!') { 1748 pri_invert = 1; 1749 q++; 1750 } 1751 while (!pri_done) { 1752 switch (*q) { 1753 case '<': 1754 pri_cmp |= PRI_LT; 1755 q++; 1756 break; 1757 case '=': 1758 pri_cmp |= PRI_EQ; 1759 q++; 1760 break; 1761 case '>': 1762 pri_cmp |= PRI_GT; 1763 q++; 1764 break; 1765 default: 1766 pri_done++; 1767 break; 1768 } 1769 } 1770 1771 /* collect priority name */ 1772 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1773 *bp++ = *q++; 1774 *bp = '\0'; 1775 1776 /* skip cruft */ 1777 while (strchr(",;", *q)) 1778 q++; 1779 1780 /* decode priority name */ 1781 if (*buf == '*') { 1782 pri = LOG_PRIMASK + 1; 1783 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1784 } else { 1785 /* Ignore trailing spaces. */ 1786 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1787 buf[i] = '\0'; 1788 1789 pri = decode(buf, prioritynames); 1790 if (pri < 0) { 1791 snprintf(ebuf, sizeof ebuf, 1792 "unknown priority name \"%s\"", buf); 1793 logerror(ebuf); 1794 return; 1795 } 1796 } 1797 if (!pri_cmp) 1798 pri_cmp = (UniquePriority) 1799 ? (PRI_EQ) 1800 : (PRI_EQ | PRI_GT) 1801 ; 1802 if (pri_invert) 1803 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1804 1805 /* scan facilities */ 1806 while (*p && !strchr("\t.; ", *p)) { 1807 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1808 *bp++ = *p++; 1809 *bp = '\0'; 1810 1811 if (*buf == '*') { 1812 for (i = 0; i < LOG_NFACILITIES; i++) { 1813 f->f_pmask[i] = pri; 1814 f->f_pcmp[i] = pri_cmp; 1815 } 1816 } else { 1817 i = decode(buf, facilitynames); 1818 if (i < 0) { 1819 snprintf(ebuf, sizeof ebuf, 1820 "unknown facility name \"%s\"", 1821 buf); 1822 logerror(ebuf); 1823 return; 1824 } 1825 f->f_pmask[i >> 3] = pri; 1826 f->f_pcmp[i >> 3] = pri_cmp; 1827 } 1828 while (*p == ',' || *p == ' ') 1829 p++; 1830 } 1831 1832 p = q; 1833 } 1834 1835 /* skip to action part */ 1836 while (*p == '\t' || *p == ' ') 1837 p++; 1838 1839 if (*p == '-') { 1840 syncfile = 0; 1841 p++; 1842 } else 1843 syncfile = 1; 1844 1845 switch (*p) { 1846 case '@': 1847 strlcpy(f->f_un.f_forw.f_hname, ++p, 1848 sizeof(f->f_un.f_forw.f_hname)); 1849 memset(&hints, 0, sizeof(hints)); 1850 hints.ai_family = family; 1851 hints.ai_socktype = SOCK_DGRAM; 1852 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1853 &res); 1854 if (error) { 1855 logerror(gai_strerror(error)); 1856 break; 1857 } 1858 f->f_un.f_forw.f_addr = res; 1859 f->f_type = F_FORW; 1860 break; 1861 1862 case '/': 1863 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1864 f->f_type = F_UNUSED; 1865 logerror(p); 1866 break; 1867 } 1868 if (syncfile) 1869 f->f_flags |= FFLAG_SYNC; 1870 if (isatty(f->f_file)) { 1871 if (strcmp(p, ctty) == 0) 1872 f->f_type = F_CONSOLE; 1873 else 1874 f->f_type = F_TTY; 1875 strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1876 sizeof(f->f_un.f_fname)); 1877 } else { 1878 strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1879 f->f_type = F_FILE; 1880 } 1881 break; 1882 1883 case '%': 1884 if ((f->f_file = open(p + 1, O_RDWR, 0 )) < 0) { 1885 f->f_type = F_UNUSED; 1886 logerror(p + 1); 1887 break; 1888 } 1889 if (fstat(f->f_file,&sb) < 0) { 1890 close(f->f_file); 1891 f->f_type = F_UNUSED; 1892 logerror(p+1); 1893 break; 1894 } 1895 f->f_un.f_ring.f_footer = 1896 mmap(NULL, sizeof(struct clog_footer), 1897 PROT_READ|PROT_WRITE, MAP_SHARED, 1898 f->f_file, sb.st_size-sizeof(struct clog_footer)); 1899 if (f->f_un.f_ring.f_footer == NULL) { 1900 close(f->f_file); 1901 f->f_type = F_UNUSED; 1902 logerror(p + 1); 1903 break; 1904 } 1905 if (memcmp(&(f->f_un.f_ring.f_footer->cf_magic), MAGIC_CONST, 4) != 0) { 1906 munmap(f->f_un.f_ring.f_footer, 1907 sizeof(struct clog_footer)); 1908 close(f->f_file); 1909 f->f_type = F_UNUSED; 1910 errno = ENODEV; 1911 logerror(p + 1); 1912 break; 1913 } 1914 f->f_un.f_ring.f_size = sb.st_size; 1915 strcpy(f->f_un.f_ring.f_rname, p + 1); 1916 f->f_type = F_RING; 1917 break; 1918 1919 case '|': 1920 f->f_un.f_pipe.f_pid = 0; 1921 strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1922 f->f_type = F_PIPE; 1923 break; 1924 1925 case '*': 1926 f->f_type = F_WALL; 1927 break; 1928 1929 default: 1930 for (i = 0; i < MAXUNAMES && *p; i++) { 1931 for (q = p; *q && *q != ','; ) 1932 q++; 1933 strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1934 if ((q - p) > UT_NAMESIZE) 1935 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1936 else 1937 f->f_un.f_uname[i][q - p] = '\0'; 1938 while (*q == ',' || *q == ' ') 1939 q++; 1940 p = q; 1941 } 1942 f->f_type = F_USERS; 1943 break; 1944 } 1945 } 1946 1947 1948 /* 1949 * Decode a symbolic name to a numeric value 1950 */ 1951 static int 1952 decode(const char *name, CODE *codetab) 1953 { 1954 CODE *c; 1955 char *p, buf[40]; 1956 1957 if (isdigit(*name)) 1958 return (atoi(name)); 1959 1960 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1961 if (isupper(*name)) 1962 *p = tolower(*name); 1963 else 1964 *p = *name; 1965 } 1966 *p = '\0'; 1967 for (c = codetab; c->c_name; c++) 1968 if (!strcmp(buf, c->c_name)) 1969 return (c->c_val); 1970 1971 return (-1); 1972 } 1973 1974 static void 1975 markit(void) 1976 { 1977 struct filed *f; 1978 dq_t q, next; 1979 1980 now = time((time_t *)NULL); 1981 MarkSeq += TIMERINTVL; 1982 if (MarkSeq >= MarkInterval) { 1983 logmsg(LOG_INFO, "-- MARK --", 1984 LocalHostName, ADDDATE|MARK); 1985 MarkSeq = 0; 1986 } 1987 1988 for (f = Files; f; f = f->f_next) { 1989 if (f->f_prevcount && now >= REPEATTIME(f)) { 1990 dprintf("flush %s: repeated %d times, %d sec.\n", 1991 TypeNames[f->f_type], f->f_prevcount, 1992 repeatinterval[f->f_repeatcount]); 1993 fprintlog(f, 0, (char *)NULL); 1994 BACKOFF(f); 1995 } 1996 } 1997 1998 /* Walk the dead queue, and see if we should signal somebody. */ 1999 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2000 next = TAILQ_NEXT(q, dq_entries); 2001 2002 switch (q->dq_timeout) { 2003 case 0: 2004 /* Already signalled once, try harder now. */ 2005 if (kill(q->dq_pid, SIGKILL) != 0) 2006 deadq_remove(q->dq_pid); 2007 break; 2008 2009 case 1: 2010 /* 2011 * Timed out on dead queue, send terminate 2012 * signal. Note that we leave the removal 2013 * from the dead queue to reapchild(), which 2014 * will also log the event (unless the process 2015 * didn't even really exist, in case we simply 2016 * drop it from the dead queue). 2017 */ 2018 if (kill(q->dq_pid, SIGTERM) != 0) 2019 deadq_remove(q->dq_pid); 2020 /* FALLTHROUGH */ 2021 2022 default: 2023 q->dq_timeout--; 2024 } 2025 } 2026 MarkSet = 0; 2027 alarm(TIMERINTVL); 2028 } 2029 2030 /* 2031 * fork off and become a daemon, but wait for the child to come online 2032 * before returing to the parent, or we get disk thrashing at boot etc. 2033 * Set a timer so we don't hang forever if it wedges. 2034 */ 2035 static int 2036 waitdaemon(int nochdir, int noclose, int maxwait) 2037 { 2038 int fd; 2039 int status; 2040 pid_t pid, childpid; 2041 2042 switch (childpid = fork()) { 2043 case -1: 2044 return (-1); 2045 case 0: 2046 break; 2047 default: 2048 signal(SIGALRM, timedout); 2049 alarm(maxwait); 2050 while ((pid = wait3(&status, 0, NULL)) != -1) { 2051 if (WIFEXITED(status)) 2052 errx(1, "child pid %d exited with return code %d", 2053 pid, WEXITSTATUS(status)); 2054 if (WIFSIGNALED(status)) 2055 errx(1, "child pid %d exited on signal %d%s", 2056 pid, WTERMSIG(status), 2057 WCOREDUMP(status) ? " (core dumped)" : 2058 ""); 2059 if (pid == childpid) /* it's gone... */ 2060 break; 2061 } 2062 exit(0); 2063 } 2064 2065 if (setsid() == -1) 2066 return (-1); 2067 2068 if (!nochdir) 2069 chdir("/"); 2070 2071 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2072 dup2(fd, STDIN_FILENO); 2073 dup2(fd, STDOUT_FILENO); 2074 dup2(fd, STDERR_FILENO); 2075 if (fd > 2) 2076 close (fd); 2077 } 2078 return (getppid()); 2079 } 2080 2081 /* 2082 * We get a SIGALRM from the child when it's running and finished doing it's 2083 * fsync()'s or O_SYNC writes for all the boot messages. 2084 * 2085 * We also get a signal from the kernel if the timer expires, so check to 2086 * see what happened. 2087 */ 2088 static void 2089 timedout(int sig __unused) 2090 { 2091 int left; 2092 left = alarm(0); 2093 signal(SIGALRM, SIG_DFL); 2094 if (left == 0) 2095 errx(1, "timed out waiting for child"); 2096 else 2097 _exit(0); 2098 } 2099 2100 /* 2101 * Add `s' to the list of allowable peer addresses to accept messages 2102 * from. 2103 * 2104 * `s' is a string in the form: 2105 * 2106 * [*]domainname[:{servicename|portnumber|*}] 2107 * 2108 * or 2109 * 2110 * netaddr/maskbits[:{servicename|portnumber|*}] 2111 * 2112 * Returns -1 on error, 0 if the argument was valid. 2113 */ 2114 static int 2115 allowaddr(char *s) 2116 { 2117 char *cp1, *cp2; 2118 struct allowedpeer ap; 2119 struct servent *se; 2120 int masklen = -1, i; 2121 struct addrinfo hints, *res; 2122 struct in_addr *addrp, *maskp; 2123 u_int32_t *addr6p, *mask6p; 2124 char ip[NI_MAXHOST]; 2125 2126 #ifdef INET6 2127 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2128 #endif 2129 cp1 = s; 2130 if ((cp1 = strrchr(cp1, ':'))) { 2131 /* service/port provided */ 2132 *cp1++ = '\0'; 2133 if (strlen(cp1) == 1 && *cp1 == '*') 2134 /* any port allowed */ 2135 ap.port = 0; 2136 else if ((se = getservbyname(cp1, "udp"))) { 2137 ap.port = ntohs(se->s_port); 2138 } else { 2139 ap.port = strtol(cp1, &cp2, 0); 2140 if (*cp2 != '\0') 2141 return (-1); /* port not numeric */ 2142 } 2143 } else { 2144 if ((se = getservbyname("syslog", "udp"))) 2145 ap.port = ntohs(se->s_port); 2146 else 2147 /* sanity, should not happen */ 2148 ap.port = 514; 2149 } 2150 2151 if ((cp1 = strchr(s, '/')) != NULL && 2152 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2153 *cp1 = '\0'; 2154 if ((masklen = atoi(cp1 + 1)) < 0) 2155 return (-1); 2156 } 2157 #ifdef INET6 2158 if (*s == '[') { 2159 cp2 = s + strlen(s) - 1; 2160 if (*cp2 == ']') { 2161 ++s; 2162 *cp2 = '\0'; 2163 } else { 2164 cp2 = NULL; 2165 } 2166 } else { 2167 cp2 = NULL; 2168 } 2169 #endif 2170 memset(&hints, 0, sizeof(hints)); 2171 hints.ai_family = PF_UNSPEC; 2172 hints.ai_socktype = SOCK_DGRAM; 2173 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2174 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2175 ap.isnumeric = 1; 2176 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2177 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2178 ap.a_mask.ss_family = res->ai_family; 2179 if (res->ai_family == AF_INET) { 2180 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2181 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2182 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2183 if (masklen < 0) { 2184 /* use default netmask */ 2185 if (IN_CLASSA(ntohl(addrp->s_addr))) 2186 maskp->s_addr = htonl(IN_CLASSA_NET); 2187 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2188 maskp->s_addr = htonl(IN_CLASSB_NET); 2189 else 2190 maskp->s_addr = htonl(IN_CLASSC_NET); 2191 } else if (masklen <= 32) { 2192 /* convert masklen to netmask */ 2193 if (masklen == 0) 2194 maskp->s_addr = 0; 2195 else 2196 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2197 } else { 2198 freeaddrinfo(res); 2199 return (-1); 2200 } 2201 /* Lose any host bits in the network number. */ 2202 addrp->s_addr &= maskp->s_addr; 2203 } 2204 #ifdef INET6 2205 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2206 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2207 if (masklen < 0) 2208 masklen = 128; 2209 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2210 /* convert masklen to netmask */ 2211 while (masklen > 0) { 2212 if (masklen < 32) { 2213 *mask6p = htonl(~(0xffffffff >> masklen)); 2214 break; 2215 } 2216 *mask6p++ = 0xffffffff; 2217 masklen -= 32; 2218 } 2219 /* Lose any host bits in the network number. */ 2220 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2221 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2222 for (i = 0; i < 4; i++) 2223 addr6p[i] &= mask6p[i]; 2224 } 2225 #endif 2226 else { 2227 freeaddrinfo(res); 2228 return (-1); 2229 } 2230 freeaddrinfo(res); 2231 } else { 2232 /* arg `s' is domain name */ 2233 ap.isnumeric = 0; 2234 ap.a_name = s; 2235 if (cp1) 2236 *cp1 = '/'; 2237 #ifdef INET6 2238 if (cp2) { 2239 *cp2 = ']'; 2240 --s; 2241 } 2242 #endif 2243 } 2244 2245 if (Debug) { 2246 printf("allowaddr: rule %d: ", NumAllowed); 2247 if (ap.isnumeric) { 2248 printf("numeric, "); 2249 getnameinfo((struct sockaddr *)&ap.a_addr, 2250 ((struct sockaddr *)&ap.a_addr)->sa_len, 2251 ip, sizeof ip, NULL, 0, 2252 NI_NUMERICHOST | withscopeid); 2253 printf("addr = %s, ", ip); 2254 getnameinfo((struct sockaddr *)&ap.a_mask, 2255 ((struct sockaddr *)&ap.a_mask)->sa_len, 2256 ip, sizeof ip, NULL, 0, 2257 NI_NUMERICHOST | withscopeid); 2258 printf("mask = %s; ", ip); 2259 } else { 2260 printf("domainname = %s; ", ap.a_name); 2261 } 2262 printf("port = %d\n", ap.port); 2263 } 2264 2265 if ((AllowedPeers = realloc(AllowedPeers, 2266 ++NumAllowed * sizeof(struct allowedpeer))) 2267 == NULL) { 2268 logerror("realloc"); 2269 exit(1); 2270 } 2271 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2272 return (0); 2273 } 2274 2275 /* 2276 * Validate that the remote peer has permission to log to us. 2277 */ 2278 static int 2279 validate(struct sockaddr *sa, const char *hname) 2280 { 2281 int i, j, reject; 2282 size_t l1, l2; 2283 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2284 struct allowedpeer *ap; 2285 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2286 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2287 struct addrinfo hints, *res; 2288 u_short sport; 2289 2290 if (NumAllowed == 0) 2291 /* traditional behaviour, allow everything */ 2292 return (1); 2293 2294 strlcpy(name, hname, sizeof(name)); 2295 memset(&hints, 0, sizeof(hints)); 2296 hints.ai_family = PF_UNSPEC; 2297 hints.ai_socktype = SOCK_DGRAM; 2298 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2299 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2300 freeaddrinfo(res); 2301 else if (strchr(name, '.') == NULL) { 2302 strlcat(name, ".", sizeof name); 2303 strlcat(name, LocalDomain, sizeof name); 2304 } 2305 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2306 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2307 return (0); /* for safety, should not occur */ 2308 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2309 ip, port, name); 2310 sport = atoi(port); 2311 2312 /* now, walk down the list */ 2313 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2314 if (ap->port != 0 && ap->port != sport) { 2315 dprintf("rejected in rule %d due to port mismatch.\n", i); 2316 continue; 2317 } 2318 2319 if (ap->isnumeric) { 2320 if (ap->a_addr.ss_family != sa->sa_family) { 2321 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2322 continue; 2323 } 2324 if (ap->a_addr.ss_family == AF_INET) { 2325 sin4 = (struct sockaddr_in *)sa; 2326 a4p = (struct sockaddr_in *)&ap->a_addr; 2327 m4p = (struct sockaddr_in *)&ap->a_mask; 2328 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2329 != a4p->sin_addr.s_addr) { 2330 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2331 continue; 2332 } 2333 } 2334 #ifdef INET6 2335 else if (ap->a_addr.ss_family == AF_INET6) { 2336 sin6 = (struct sockaddr_in6 *)sa; 2337 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2338 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2339 #ifdef NI_WITHSCOPEID 2340 if (a6p->sin6_scope_id != 0 && 2341 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2342 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2343 continue; 2344 } 2345 #endif 2346 reject = 0; 2347 for (j = 0; j < 16; j += 4) { 2348 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2349 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2350 ++reject; 2351 break; 2352 } 2353 } 2354 if (reject) { 2355 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2356 continue; 2357 } 2358 } 2359 #endif 2360 else 2361 continue; 2362 } else { 2363 cp = ap->a_name; 2364 l1 = strlen(name); 2365 if (*cp == '*') { 2366 /* allow wildmatch */ 2367 cp++; 2368 l2 = strlen(cp); 2369 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2370 dprintf("rejected in rule %d due to name mismatch.\n", i); 2371 continue; 2372 } 2373 } else { 2374 /* exact match */ 2375 l2 = strlen(cp); 2376 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2377 dprintf("rejected in rule %d due to name mismatch.\n", i); 2378 continue; 2379 } 2380 } 2381 } 2382 dprintf("accepted in rule %d.\n", i); 2383 return (1); /* hooray! */ 2384 } 2385 return (0); 2386 } 2387 2388 /* 2389 * Fairly similar to popen(3), but returns an open descriptor, as 2390 * opposed to a FILE *. 2391 */ 2392 static int 2393 p_open(const char *prog, pid_t *rpid) 2394 { 2395 int pfd[2], nulldesc, i; 2396 pid_t pid; 2397 sigset_t omask, mask; 2398 char *argv[4]; /* sh -c cmd NULL */ 2399 char errmsg[200]; 2400 2401 if (pipe(pfd) == -1) 2402 return (-1); 2403 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2404 /* we are royally screwed anyway */ 2405 return (-1); 2406 2407 sigemptyset(&mask); 2408 sigaddset(&mask, SIGALRM); 2409 sigaddset(&mask, SIGHUP); 2410 sigprocmask(SIG_BLOCK, &mask, &omask); 2411 switch ((pid = fork())) { 2412 case -1: 2413 sigprocmask(SIG_SETMASK, &omask, 0); 2414 close(nulldesc); 2415 return (-1); 2416 2417 case 0: 2418 argv[0] = strdup("sh"); 2419 argv[1] = strdup("-c"); 2420 argv[2] = strdup(prog); 2421 argv[3] = NULL; 2422 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2423 logerror("strdup"); 2424 exit(1); 2425 } 2426 2427 alarm(0); 2428 setsid(); /* Avoid catching SIGHUPs. */ 2429 2430 /* 2431 * Throw away pending signals, and reset signal 2432 * behaviour to standard values. 2433 */ 2434 signal(SIGALRM, SIG_IGN); 2435 signal(SIGHUP, SIG_IGN); 2436 sigprocmask(SIG_SETMASK, &omask, 0); 2437 signal(SIGPIPE, SIG_DFL); 2438 signal(SIGQUIT, SIG_DFL); 2439 signal(SIGALRM, SIG_DFL); 2440 signal(SIGHUP, SIG_DFL); 2441 2442 dup2(pfd[0], STDIN_FILENO); 2443 dup2(nulldesc, STDOUT_FILENO); 2444 dup2(nulldesc, STDERR_FILENO); 2445 for (i = getdtablesize(); i > 2; i--) 2446 close(i); 2447 2448 execvp(_PATH_BSHELL, argv); 2449 _exit(255); 2450 } 2451 2452 sigprocmask(SIG_SETMASK, &omask, 0); 2453 close(nulldesc); 2454 close(pfd[0]); 2455 /* 2456 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2457 * supposed to get an EWOULDBLOCK on writev(2), which is 2458 * caught by the logic above anyway, which will in turn close 2459 * the pipe, and fork a new logging subprocess if necessary. 2460 * The stale subprocess will be killed some time later unless 2461 * it terminated itself due to closing its input pipe (so we 2462 * get rid of really dead puppies). 2463 */ 2464 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2465 /* This is bad. */ 2466 snprintf(errmsg, sizeof errmsg, 2467 "Warning: cannot change pipe to PID %d to " 2468 "non-blocking behaviour.", 2469 (int)pid); 2470 logerror(errmsg); 2471 } 2472 *rpid = pid; 2473 return (pfd[1]); 2474 } 2475 2476 static void 2477 deadq_enter(pid_t pid, const char *name) 2478 { 2479 dq_t p; 2480 int status; 2481 2482 /* 2483 * Be paranoid, if we can't signal the process, don't enter it 2484 * into the dead queue (perhaps it's already dead). If possible, 2485 * we try to fetch and log the child's status. 2486 */ 2487 if (kill(pid, 0) != 0) { 2488 if (waitpid(pid, &status, WNOHANG) > 0) 2489 log_deadchild(pid, status, name); 2490 return; 2491 } 2492 2493 p = malloc(sizeof(struct deadq_entry)); 2494 if (p == NULL) { 2495 logerror("malloc"); 2496 exit(1); 2497 } 2498 2499 p->dq_pid = pid; 2500 p->dq_timeout = DQ_TIMO_INIT; 2501 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2502 } 2503 2504 static int 2505 deadq_remove(pid_t pid) 2506 { 2507 dq_t q; 2508 2509 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2510 if (q->dq_pid == pid) { 2511 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2512 free(q); 2513 return (1); 2514 } 2515 } 2516 2517 return (0); 2518 } 2519 2520 static void 2521 log_deadchild(pid_t pid, int status, const char *name) 2522 { 2523 int code; 2524 char buf[256]; 2525 const char *reason; 2526 2527 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2528 if (WIFSIGNALED(status)) { 2529 reason = "due to signal"; 2530 code = WTERMSIG(status); 2531 } else { 2532 reason = "with status"; 2533 code = WEXITSTATUS(status); 2534 if (code == 0) 2535 return; 2536 } 2537 snprintf(buf, sizeof buf, 2538 "Logging subprocess %d (%s) exited %s %d.", 2539 pid, name, reason, code); 2540 logerror(buf); 2541 } 2542 2543 static int * 2544 socksetup(int af, const char *bindhostname) 2545 { 2546 struct addrinfo hints, *res, *r; 2547 int error, maxs, *s, *socks; 2548 2549 memset(&hints, 0, sizeof(hints)); 2550 hints.ai_flags = AI_PASSIVE; 2551 hints.ai_family = af; 2552 hints.ai_socktype = SOCK_DGRAM; 2553 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2554 if (error) { 2555 logerror(gai_strerror(error)); 2556 errno = 0; 2557 die(0); 2558 } 2559 2560 /* Count max number of sockets we may open */ 2561 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2562 socks = malloc((maxs+1) * sizeof(int)); 2563 if (socks == NULL) { 2564 logerror("couldn't allocate memory for sockets"); 2565 die(0); 2566 } 2567 2568 *socks = 0; /* num of sockets counter at start of array */ 2569 s = socks + 1; 2570 for (r = res; r; r = r->ai_next) { 2571 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2572 if (*s < 0) { 2573 logerror("socket"); 2574 continue; 2575 } 2576 if (r->ai_family == AF_INET6) { 2577 int on = 1; 2578 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2579 (char *)&on, sizeof (on)) < 0) { 2580 logerror("setsockopt"); 2581 close(*s); 2582 continue; 2583 } 2584 } 2585 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2586 close(*s); 2587 logerror("bind"); 2588 continue; 2589 } 2590 2591 (*socks)++; 2592 s++; 2593 } 2594 2595 if (*socks == 0) { 2596 free(socks); 2597 if (Debug) 2598 return (NULL); 2599 else 2600 die(0); 2601 } 2602 if (res) 2603 freeaddrinfo(res); 2604 2605 return (socks); 2606 } 2607 2608 ssize_t 2609 rbwritev(struct filed *f, struct iovec *iov, int iovcnt) 2610 { 2611 int i; 2612 ssize_t out = 0; 2613 ssize_t error; 2614 2615 for (i = 0; i < iovcnt; i++) { 2616 error = rbwrite(f, iov[i].iov_base, iov[i].iov_len); 2617 if (error == -1) 2618 return (-1); 2619 out += error; 2620 } 2621 return (out); 2622 } 2623 2624 2625 ssize_t 2626 rbwrite(struct filed *f, char *buf, size_t nbytes) 2627 { 2628 size_t maxwrite; 2629 ssize_t error; 2630 ssize_t out; 2631 2632 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2633 f->f_un.f_ring.f_footer->cf_next; 2634 out = 0; 2635 2636 f->f_un.f_ring.f_footer->cf_lock = 1; 2637 while (nbytes > 0) { 2638 maxwrite = f->f_un.f_ring.f_footer->cf_max - 2639 f->f_un.f_ring.f_footer->cf_next; 2640 if (maxwrite > nbytes) 2641 maxwrite = nbytes; 2642 error = pwrite(f->f_file, buf, maxwrite, 2643 f->f_un.f_ring.f_footer->cf_next); 2644 if (error == -1) { 2645 f->f_un.f_ring.f_footer->cf_lock = 0; 2646 return (-1); 2647 } 2648 nbytes -= error; 2649 out += error; 2650 buf += error; 2651 f->f_un.f_ring.f_footer->cf_next += error; 2652 if (f->f_un.f_ring.f_footer->cf_next == 2653 f->f_un.f_ring.f_footer->cf_max) { 2654 f->f_un.f_ring.f_footer->cf_next = 0; 2655 f->f_un.f_ring.f_footer->cf_wrap = 1; 2656 } 2657 2658 } 2659 2660 f->f_un.f_ring.f_footer->cf_lock = 0; 2661 return (out); 2662 } 2663