1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * syslogd -- log system messages 51 * 52 * This program implements a system log. It takes a series of lines. 53 * Each line may have a priority, signified as "<n>" as 54 * the first characters of the line. If this is 55 * not present, a default priority is used. 56 * 57 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 58 * cause it to reread its configuration file. 59 * 60 * Defined Constants: 61 * 62 * MAXLINE -- the maximum line length that can be handled. 63 * DEFUPRI -- the default priority for user messages 64 * DEFSPRI -- the default priority for kernel messages 65 * 66 * Author: Eric Allman 67 * extensive changes by Ralph Campbell 68 * more extensive changes by Eric Allman (again) 69 * Extension to log by program name as well as facility and priority 70 * by Peter da Silva. 71 * -u and -v by Harlan Stenn. 72 * Priority comparison code by Harlan Stenn. 73 */ 74 75 #define MAXLINE 1024 /* maximum line length */ 76 #define MAXSVLINE 120 /* maximum saved line length */ 77 #define DEFUPRI (LOG_USER|LOG_NOTICE) 78 #define DEFSPRI (LOG_KERN|LOG_CRIT) 79 #define TIMERINTVL 30 /* interval for checking flush, mark */ 80 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 81 82 #include <sys/param.h> 83 #include <sys/ioctl.h> 84 #include <sys/stat.h> 85 #include <sys/wait.h> 86 #include <sys/socket.h> 87 #include <sys/queue.h> 88 #include <sys/uio.h> 89 #include <sys/un.h> 90 #include <sys/time.h> 91 #include <sys/resource.h> 92 #include <sys/syslimits.h> 93 #include <sys/types.h> 94 95 #include <netinet/in.h> 96 #include <netdb.h> 97 #include <arpa/inet.h> 98 99 #include <ctype.h> 100 #include <err.h> 101 #include <errno.h> 102 #include <fcntl.h> 103 #include <libutil.h> 104 #include <limits.h> 105 #include <paths.h> 106 #include <signal.h> 107 #include <stdio.h> 108 #include <stdlib.h> 109 #include <string.h> 110 #include <sysexits.h> 111 #include <unistd.h> 112 #include <utmp.h> 113 114 #include "pathnames.h" 115 #include "ttymsg.h" 116 117 #define SYSLOG_NAMES 118 #include <sys/syslog.h> 119 120 #ifdef NI_WITHSCOPEID 121 static const int withscopeid = NI_WITHSCOPEID; 122 #else 123 static const int withscopeid; 124 #endif 125 126 const char *ConfFile = _PATH_LOGCONF; 127 const char *PidFile = _PATH_LOGPID; 128 const char ctty[] = _PATH_CONSOLE; 129 130 #define dprintf if (Debug) printf 131 132 #define MAXUNAMES 20 /* maximum number of user names */ 133 134 #define MAXFUNIX 20 135 136 int nfunix = 1; 137 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 138 int funix[MAXFUNIX]; 139 140 /* 141 * Flags to logmsg(). 142 */ 143 144 #define IGN_CONS 0x001 /* don't print on console */ 145 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 146 #define ADDDATE 0x004 /* add a date to the message */ 147 #define MARK 0x008 /* this message is a mark */ 148 #define ISKERNEL 0x010 /* kernel generated message */ 149 150 /* 151 * This structure represents the files that will have log 152 * copies printed. 153 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 154 * or if f_type if F_PIPE and f_pid > 0. 155 */ 156 157 struct filed { 158 struct filed *f_next; /* next in linked list */ 159 short f_type; /* entry type, see below */ 160 short f_file; /* file descriptor */ 161 time_t f_time; /* time this was last written */ 162 char *f_host; /* host from which to recd. */ 163 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 164 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 165 #define PRI_LT 0x1 166 #define PRI_EQ 0x2 167 #define PRI_GT 0x4 168 char *f_program; /* program this applies to */ 169 union { 170 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 171 struct { 172 char f_hname[MAXHOSTNAMELEN]; 173 struct addrinfo *f_addr; 174 175 } f_forw; /* forwarding address */ 176 char f_fname[MAXPATHLEN]; 177 struct { 178 char f_pname[MAXPATHLEN]; 179 pid_t f_pid; 180 } f_pipe; 181 } f_un; 182 char f_prevline[MAXSVLINE]; /* last message logged */ 183 char f_lasttime[16]; /* time of last occurrence */ 184 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 185 int f_prevpri; /* pri of f_prevline */ 186 int f_prevlen; /* length of f_prevline */ 187 int f_prevcount; /* repetition cnt of prevline */ 188 u_int f_repeatcount; /* number of "repeated" msgs */ 189 int f_flags; /* file-specific flags */ 190 #define FFLAG_SYNC 0x01 191 #define FFLAG_NEEDSYNC 0x02 192 }; 193 194 /* 195 * Queue of about-to-be dead processes we should watch out for. 196 */ 197 198 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 199 struct stailhead *deadq_headp; 200 201 struct deadq_entry { 202 pid_t dq_pid; 203 int dq_timeout; 204 TAILQ_ENTRY(deadq_entry) dq_entries; 205 }; 206 207 /* 208 * The timeout to apply to processes waiting on the dead queue. Unit 209 * of measure is `mark intervals', i.e. 20 minutes by default. 210 * Processes on the dead queue will be terminated after that time. 211 */ 212 213 #define DQ_TIMO_INIT 2 214 215 typedef struct deadq_entry *dq_t; 216 217 218 /* 219 * Struct to hold records of network addresses that are allowed to log 220 * to us. 221 */ 222 struct allowedpeer { 223 int isnumeric; 224 u_short port; 225 union { 226 struct { 227 struct sockaddr_storage addr; 228 struct sockaddr_storage mask; 229 } numeric; 230 char *name; 231 } u; 232 #define a_addr u.numeric.addr 233 #define a_mask u.numeric.mask 234 #define a_name u.name 235 }; 236 237 238 /* 239 * Intervals at which we flush out "message repeated" messages, 240 * in seconds after previous message is logged. After each flush, 241 * we move to the next interval until we reach the largest. 242 */ 243 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 244 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 245 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 246 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 247 (f)->f_repeatcount = MAXREPEAT; \ 248 } 249 250 /* values for f_type */ 251 #define F_UNUSED 0 /* unused entry */ 252 #define F_FILE 1 /* regular file */ 253 #define F_TTY 2 /* terminal */ 254 #define F_CONSOLE 3 /* console terminal */ 255 #define F_FORW 4 /* remote machine */ 256 #define F_USERS 5 /* list of users */ 257 #define F_WALL 6 /* everyone logged on */ 258 #define F_PIPE 7 /* pipe to program */ 259 260 const char *TypeNames[8] = { 261 "UNUSED", "FILE", "TTY", "CONSOLE", 262 "FORW", "USERS", "WALL", "PIPE" 263 }; 264 265 static struct filed *Files; /* Log files that we write to */ 266 static struct filed consfile; /* Console */ 267 268 static int Debug; /* debug flag */ 269 static int resolve = 1; /* resolve hostname */ 270 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 271 static const char *LocalDomain; /* our local domain name */ 272 static int *finet; /* Internet datagram socket */ 273 static int fklog = -1; /* /dev/klog */ 274 static int Initialized; /* set when we have initialized ourselves */ 275 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 276 static int MarkSeq; /* mark sequence number */ 277 static int SecureMode; /* when true, receive only unix domain socks */ 278 #ifdef INET6 279 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 280 #else 281 static int family = PF_INET; /* protocol family (IPv4 only) */ 282 #endif 283 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 284 static int use_bootfile; /* log entire bootfile for every kern msg */ 285 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 286 287 static char bootfile[MAXLINE+1]; /* booted kernel file */ 288 289 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 290 static int NumAllowed; /* Number of entries in AllowedPeers */ 291 292 static int UniquePriority; /* Only log specified priority? */ 293 static int LogFacPri; /* Put facility and priority in log message: */ 294 /* 0=no, 1=numeric, 2=names */ 295 static int KeepKernFac; /* Keep remotely logged kernel facility */ 296 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 297 298 volatile sig_atomic_t MarkSet, WantDie; 299 300 static int allowaddr(char *); 301 static void cfline(const char *, struct filed *, 302 const char *, const char *); 303 static const char *cvthname(struct sockaddr *); 304 static void deadq_enter(pid_t, const char *); 305 static int deadq_remove(pid_t); 306 static int decode(const char *, CODE *); 307 static void die(int); 308 static void dodie(int); 309 static void dofsync(void); 310 static void domark(int); 311 static void fprintlog(struct filed *, int, const char *); 312 static int *socksetup(int, const char *); 313 static void init(int); 314 static void logerror(const char *); 315 static void logmsg(int, const char *, const char *, int); 316 static void log_deadchild(pid_t, int, const char *); 317 static void markit(void); 318 static int skip_message(const char *, const char *, int); 319 static void printline(const char *, char *); 320 static void printsys(char *); 321 static int p_open(const char *, pid_t *); 322 static void readklog(void); 323 static void reapchild(int); 324 static void usage(void); 325 static int validate(struct sockaddr *, const char *); 326 static void unmapped(struct sockaddr *); 327 static void wallmsg(struct filed *, struct iovec *); 328 static int waitdaemon(int, int, int); 329 static void timedout(int); 330 331 int 332 main(int argc, char *argv[]) 333 { 334 int ch, i, fdsrmax = 0, l; 335 struct sockaddr_un sunx, fromunix; 336 struct sockaddr_storage frominet; 337 fd_set *fdsr = NULL; 338 FILE *fp; 339 char line[MAXLINE + 1]; 340 const char *bindhostname, *hname; 341 struct timeval tv, *tvp; 342 struct sigaction sact; 343 sigset_t mask; 344 pid_t ppid = 1; 345 socklen_t len; 346 347 bindhostname = NULL; 348 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 349 switch (ch) { 350 case '4': 351 family = PF_INET; 352 break; 353 #ifdef INET6 354 case '6': 355 family = PF_INET6; 356 break; 357 #endif 358 case 'A': 359 send_to_all++; 360 break; 361 case 'a': /* allow specific network addresses only */ 362 if (allowaddr(optarg) == -1) 363 usage(); 364 break; 365 case 'b': 366 bindhostname = optarg; 367 break; 368 case 'c': 369 no_compress++; 370 break; 371 case 'd': /* debug */ 372 Debug++; 373 break; 374 case 'f': /* configuration file */ 375 ConfFile = optarg; 376 break; 377 case 'k': /* keep remote kern fac */ 378 KeepKernFac = 1; 379 break; 380 case 'l': 381 if (strlen(optarg) >= sizeof(sunx.sun_path)) 382 errx(1, "%s path too long, exiting", optarg); 383 if (nfunix < MAXFUNIX) 384 funixn[nfunix++] = optarg; 385 else 386 warnx("out of descriptors, ignoring %s", 387 optarg); 388 break; 389 case 'm': /* mark interval */ 390 MarkInterval = atoi(optarg) * 60; 391 break; 392 case 'n': 393 resolve = 0; 394 break; 395 case 'o': 396 use_bootfile = 1; 397 break; 398 case 'p': /* path */ 399 if (strlen(optarg) >= sizeof(sunx.sun_path)) 400 errx(1, "%s path too long, exiting", optarg); 401 funixn[0] = optarg; 402 break; 403 case 'P': /* path for alt. PID */ 404 PidFile = optarg; 405 break; 406 case 's': /* no network mode */ 407 SecureMode++; 408 break; 409 case 'u': /* only log specified priority */ 410 UniquePriority++; 411 break; 412 case 'v': /* log facility and priority */ 413 LogFacPri++; 414 break; 415 default: 416 usage(); 417 } 418 if ((argc -= optind) != 0) 419 usage(); 420 421 if (!Debug) { 422 ppid = waitdaemon(0, 0, 30); 423 if (ppid < 0) 424 err(1, "could not become daemon"); 425 } else { 426 setlinebuf(stdout); 427 } 428 429 if (NumAllowed) 430 endservent(); 431 432 consfile.f_type = F_CONSOLE; 433 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 434 sizeof(consfile.f_un.f_fname)); 435 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 436 (void)signal(SIGTERM, dodie); 437 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 438 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 439 /* 440 * We don't want the SIGCHLD and SIGHUP handlers to interfere 441 * with each other; they are likely candidates for being called 442 * simultaneously (SIGHUP closes pipe descriptor, process dies, 443 * SIGCHLD happens). 444 */ 445 sigemptyset(&mask); 446 sigaddset(&mask, SIGHUP); 447 sact.sa_handler = reapchild; 448 sact.sa_mask = mask; 449 sact.sa_flags = SA_RESTART; 450 (void)sigaction(SIGCHLD, &sact, NULL); 451 (void)signal(SIGALRM, domark); 452 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 453 (void)alarm(TIMERINTVL); 454 455 TAILQ_INIT(&deadq_head); 456 457 #ifndef SUN_LEN 458 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 459 #endif 460 for (i = 0; i < nfunix; i++) { 461 (void)unlink(funixn[i]); 462 memset(&sunx, 0, sizeof(sunx)); 463 sunx.sun_family = AF_UNIX; 464 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 465 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 466 if (funix[i] < 0 || 467 bind(funix[i], (struct sockaddr *)&sunx, 468 SUN_LEN(&sunx)) < 0 || 469 chmod(funixn[i], 0666) < 0) { 470 (void)snprintf(line, sizeof line, 471 "cannot create %s", funixn[i]); 472 logerror(line); 473 dprintf("cannot create %s (%d)\n", funixn[i], errno); 474 if (i == 0) 475 die(0); 476 } 477 } 478 if (SecureMode <= 1) 479 finet = socksetup(family, bindhostname); 480 481 if (finet) { 482 if (SecureMode) { 483 for (i = 0; i < *finet; i++) { 484 if (shutdown(finet[i+1], SHUT_RD) < 0) { 485 logerror("shutdown"); 486 if (!Debug) 487 die(0); 488 } 489 } 490 } else { 491 dprintf("listening on inet and/or inet6 socket\n"); 492 } 493 dprintf("sending on inet and/or inet6 socket\n"); 494 } 495 496 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 497 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 498 fklog = -1; 499 if (fklog < 0) 500 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 501 502 /* tuck my process id away */ 503 fp = fopen(PidFile, "w"); 504 if (fp != NULL) { 505 fprintf(fp, "%d\n", getpid()); 506 (void)fclose(fp); 507 } 508 509 dprintf("off & running....\n"); 510 511 init(0); 512 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 513 sigemptyset(&mask); 514 sigaddset(&mask, SIGCHLD); 515 sact.sa_handler = init; 516 sact.sa_mask = mask; 517 sact.sa_flags = SA_RESTART; 518 (void)sigaction(SIGHUP, &sact, NULL); 519 520 tvp = &tv; 521 tv.tv_sec = tv.tv_usec = 0; 522 523 if (fklog != -1 && fklog > fdsrmax) 524 fdsrmax = fklog; 525 if (finet && !SecureMode) { 526 for (i = 0; i < *finet; i++) { 527 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 528 fdsrmax = finet[i+1]; 529 } 530 } 531 for (i = 0; i < nfunix; i++) { 532 if (funix[i] != -1 && funix[i] > fdsrmax) 533 fdsrmax = funix[i]; 534 } 535 536 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 537 sizeof(fd_mask)); 538 if (fdsr == NULL) 539 errx(1, "calloc fd_set"); 540 541 for (;;) { 542 if (MarkSet) 543 markit(); 544 if (WantDie) 545 die(WantDie); 546 547 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 548 sizeof(fd_mask)); 549 550 if (fklog != -1) 551 FD_SET(fklog, fdsr); 552 if (finet && !SecureMode) { 553 for (i = 0; i < *finet; i++) { 554 if (finet[i+1] != -1) 555 FD_SET(finet[i+1], fdsr); 556 } 557 } 558 for (i = 0; i < nfunix; i++) { 559 if (funix[i] != -1) 560 FD_SET(funix[i], fdsr); 561 } 562 563 i = select(fdsrmax+1, fdsr, NULL, NULL, 564 needdofsync ? &tv : tvp); 565 switch (i) { 566 case 0: 567 dofsync(); 568 needdofsync = 0; 569 if (tvp) { 570 tvp = NULL; 571 if (ppid != 1) 572 kill(ppid, SIGALRM); 573 } 574 continue; 575 case -1: 576 if (errno != EINTR) 577 logerror("select"); 578 continue; 579 } 580 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 581 readklog(); 582 if (finet && !SecureMode) { 583 for (i = 0; i < *finet; i++) { 584 if (FD_ISSET(finet[i+1], fdsr)) { 585 len = sizeof(frominet); 586 l = recvfrom(finet[i+1], line, MAXLINE, 587 0, (struct sockaddr *)&frominet, 588 &len); 589 if (l > 0) { 590 line[l] = '\0'; 591 hname = cvthname((struct sockaddr *)&frominet); 592 unmapped((struct sockaddr *)&frominet); 593 if (validate((struct sockaddr *)&frominet, hname)) 594 printline(hname, line); 595 } else if (l < 0 && errno != EINTR) 596 logerror("recvfrom inet"); 597 } 598 } 599 } 600 for (i = 0; i < nfunix; i++) { 601 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 602 len = sizeof(fromunix); 603 l = recvfrom(funix[i], line, MAXLINE, 0, 604 (struct sockaddr *)&fromunix, &len); 605 if (l > 0) { 606 line[l] = '\0'; 607 printline(LocalHostName, line); 608 } else if (l < 0 && errno != EINTR) 609 logerror("recvfrom unix"); 610 } 611 } 612 } 613 if (fdsr) 614 free(fdsr); 615 } 616 617 static void 618 unmapped(struct sockaddr *sa) 619 { 620 struct sockaddr_in6 *sin6; 621 struct sockaddr_in sin4; 622 623 if (sa->sa_family != AF_INET6) 624 return; 625 if (sa->sa_len != sizeof(struct sockaddr_in6) || 626 sizeof(sin4) > sa->sa_len) 627 return; 628 sin6 = (struct sockaddr_in6 *)sa; 629 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 630 return; 631 632 memset(&sin4, 0, sizeof(sin4)); 633 sin4.sin_family = AF_INET; 634 sin4.sin_len = sizeof(struct sockaddr_in); 635 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 636 sizeof(sin4.sin_addr)); 637 sin4.sin_port = sin6->sin6_port; 638 639 memcpy(sa, &sin4, sin4.sin_len); 640 } 641 642 static void 643 usage(void) 644 { 645 646 fprintf(stderr, "%s\n%s\n%s\n%s\n", 647 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 648 " [-b bind address] [-f config_file]", 649 " [-l log_socket] [-m mark_interval]", 650 " [-P pid_file] [-p log_socket]"); 651 exit(1); 652 } 653 654 /* 655 * Take a raw input line, decode the message, and print the message 656 * on the appropriate log files. 657 */ 658 static void 659 printline(const char *hname, char *msg) 660 { 661 char *p, *q; 662 long n; 663 int c, pri; 664 char line[MAXLINE + 1]; 665 666 /* test for special codes */ 667 p = msg; 668 pri = DEFUPRI; 669 if (*p == '<') { 670 errno = 0; 671 n = strtol(p + 1, &q, 10); 672 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 673 p = q + 1; 674 pri = n; 675 } 676 } 677 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 678 pri = DEFUPRI; 679 680 /* 681 * Don't allow users to log kernel messages. 682 * NOTE: since LOG_KERN == 0 this will also match 683 * messages with no facility specified. 684 */ 685 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 686 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 687 688 q = line; 689 690 while ((c = (unsigned char)*p++) != '\0' && 691 q < &line[sizeof(line) - 4]) { 692 if ((c & 0x80) && c < 0xA0) { 693 c &= 0x7F; 694 *q++ = 'M'; 695 *q++ = '-'; 696 } 697 if (isascii(c) && iscntrl(c)) { 698 if (c == '\n') { 699 *q++ = ' '; 700 } else if (c == '\t') { 701 *q++ = '\t'; 702 } else { 703 *q++ = '^'; 704 *q++ = c ^ 0100; 705 } 706 } else { 707 *q++ = c; 708 } 709 } 710 *q = '\0'; 711 712 logmsg(pri, line, hname, 0); 713 } 714 715 /* 716 * Read /dev/klog while data are available, split into lines. 717 */ 718 static void 719 readklog(void) 720 { 721 char *p, *q, line[MAXLINE + 1]; 722 int len, i; 723 724 len = 0; 725 for (;;) { 726 i = read(fklog, line + len, MAXLINE - 1 - len); 727 if (i > 0) { 728 line[i + len] = '\0'; 729 } else { 730 if (i < 0 && errno != EINTR && errno != EAGAIN) { 731 logerror("klog"); 732 fklog = -1; 733 } 734 break; 735 } 736 737 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 738 *q = '\0'; 739 printsys(p); 740 } 741 len = strlen(p); 742 if (len >= MAXLINE - 1) { 743 printsys(p); 744 len = 0; 745 } 746 if (len > 0) 747 memmove(line, p, len + 1); 748 } 749 if (len > 0) 750 printsys(line); 751 } 752 753 /* 754 * Take a raw input line from /dev/klog, format similar to syslog(). 755 */ 756 static void 757 printsys(char *msg) 758 { 759 char *p, *q; 760 long n; 761 int flags, isprintf, pri; 762 763 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 764 p = msg; 765 pri = DEFSPRI; 766 isprintf = 1; 767 if (*p == '<') { 768 errno = 0; 769 n = strtol(p + 1, &q, 10); 770 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 771 p = q + 1; 772 pri = n; 773 isprintf = 0; 774 } 775 } 776 /* 777 * Kernel printf's and LOG_CONSOLE messages have been displayed 778 * on the console already. 779 */ 780 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 781 flags |= IGN_CONS; 782 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 783 pri = DEFSPRI; 784 logmsg(pri, p, LocalHostName, flags); 785 } 786 787 static time_t now; 788 789 /* 790 * Match a program or host name against a specification. 791 * Return a non-0 value if the message must be ignored 792 * based on the specification. 793 */ 794 static int 795 skip_message(const char *name, const char *spec, int checkcase) { 796 const char *s; 797 char prev, next; 798 int exclude = 0; 799 /* Behaviour on explicit match */ 800 801 if (spec == NULL) 802 return 0; 803 switch (*spec) { 804 case '-': 805 exclude = 1; 806 /*FALLTHROUGH*/ 807 case '+': 808 spec++; 809 break; 810 default: 811 break; 812 } 813 if (checkcase) 814 s = strstr (spec, name); 815 else 816 s = strcasestr (spec, name); 817 818 if (s != NULL) { 819 prev = (s == spec ? ',' : *(s - 1)); 820 next = *(s + strlen (name)); 821 822 if (prev == ',' && (next == '\0' || next == ',')) 823 /* Explicit match: skip iff the spec is an 824 exclusive one. */ 825 return exclude; 826 } 827 828 /* No explicit match for this name: skip the message iff 829 the spec is an inclusive one. */ 830 return !exclude; 831 } 832 833 /* 834 * Log a message to the appropriate log files, users, etc. based on 835 * the priority. 836 */ 837 static void 838 logmsg(int pri, const char *msg, const char *from, int flags) 839 { 840 struct filed *f; 841 int i, fac, msglen, omask, prilev; 842 const char *timestamp; 843 char prog[NAME_MAX+1]; 844 char buf[MAXLINE+1]; 845 846 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 847 pri, flags, from, msg); 848 849 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 850 851 /* 852 * Check to see if msg looks non-standard. 853 */ 854 msglen = strlen(msg); 855 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 856 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 857 flags |= ADDDATE; 858 859 (void)time(&now); 860 if (flags & ADDDATE) { 861 timestamp = ctime(&now) + 4; 862 } else { 863 timestamp = msg; 864 msg += 16; 865 msglen -= 16; 866 } 867 868 /* skip leading blanks */ 869 while (isspace(*msg)) { 870 msg++; 871 msglen--; 872 } 873 874 /* extract facility and priority level */ 875 if (flags & MARK) 876 fac = LOG_NFACILITIES; 877 else 878 fac = LOG_FAC(pri); 879 prilev = LOG_PRI(pri); 880 881 /* extract program name */ 882 for (i = 0; i < NAME_MAX; i++) { 883 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 884 msg[i] == '/') 885 break; 886 prog[i] = msg[i]; 887 } 888 prog[i] = 0; 889 890 /* add kernel prefix for kernel messages */ 891 if (flags & ISKERNEL) { 892 snprintf(buf, sizeof(buf), "%s: %s", 893 use_bootfile ? bootfile : "kernel", msg); 894 msg = buf; 895 msglen = strlen(buf); 896 } 897 898 /* log the message to the particular outputs */ 899 if (!Initialized) { 900 f = &consfile; 901 f->f_file = open(ctty, O_WRONLY, 0); 902 903 if (f->f_file >= 0) { 904 (void)strlcpy(f->f_lasttime, timestamp, 905 sizeof(f->f_lasttime)); 906 fprintlog(f, flags, msg); 907 (void)close(f->f_file); 908 } 909 (void)sigsetmask(omask); 910 return; 911 } 912 for (f = Files; f; f = f->f_next) { 913 /* skip messages that are incorrect priority */ 914 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 915 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 916 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 917 ) 918 || f->f_pmask[fac] == INTERNAL_NOPRI) 919 continue; 920 921 /* skip messages with the incorrect hostname */ 922 if (skip_message(from, f->f_host, 0)) 923 continue; 924 925 /* skip messages with the incorrect program name */ 926 if (skip_message(prog, f->f_program, 1)) 927 continue; 928 929 /* skip message to console if it has already been printed */ 930 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 931 continue; 932 933 /* don't output marks to recently written files */ 934 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 935 continue; 936 937 /* 938 * suppress duplicate lines to this file 939 */ 940 if (no_compress - (f->f_type != F_PIPE) < 1 && 941 (flags & MARK) == 0 && msglen == f->f_prevlen && 942 !strcmp(msg, f->f_prevline) && 943 !strcasecmp(from, f->f_prevhost)) { 944 (void)strlcpy(f->f_lasttime, timestamp, 945 sizeof(f->f_lasttime)); 946 f->f_prevcount++; 947 dprintf("msg repeated %d times, %ld sec of %d\n", 948 f->f_prevcount, (long)(now - f->f_time), 949 repeatinterval[f->f_repeatcount]); 950 /* 951 * If domark would have logged this by now, 952 * flush it now (so we don't hold isolated messages), 953 * but back off so we'll flush less often 954 * in the future. 955 */ 956 if (now > REPEATTIME(f)) { 957 fprintlog(f, flags, (char *)NULL); 958 BACKOFF(f); 959 } 960 } else { 961 /* new line, save it */ 962 if (f->f_prevcount) 963 fprintlog(f, 0, (char *)NULL); 964 f->f_repeatcount = 0; 965 f->f_prevpri = pri; 966 (void)strlcpy(f->f_lasttime, timestamp, 967 sizeof(f->f_lasttime)); 968 (void)strlcpy(f->f_prevhost, from, 969 sizeof(f->f_prevhost)); 970 if (msglen < MAXSVLINE) { 971 f->f_prevlen = msglen; 972 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 973 fprintlog(f, flags, (char *)NULL); 974 } else { 975 f->f_prevline[0] = 0; 976 f->f_prevlen = 0; 977 fprintlog(f, flags, msg); 978 } 979 } 980 } 981 (void)sigsetmask(omask); 982 } 983 984 static void 985 dofsync(void) 986 { 987 struct filed *f; 988 989 for (f = Files; f; f = f->f_next) { 990 if ((f->f_type == F_FILE) && 991 (f->f_flags & FFLAG_NEEDSYNC)) { 992 f->f_flags &= ~FFLAG_NEEDSYNC; 993 (void)fsync(f->f_file); 994 } 995 } 996 } 997 998 static void 999 fprintlog(struct filed *f, int flags, const char *msg) 1000 { 1001 struct iovec iov[7]; 1002 struct iovec *v; 1003 struct addrinfo *r; 1004 int i, l, lsent = 0; 1005 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1006 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1007 const char *msgret; 1008 1009 v = iov; 1010 if (f->f_type == F_WALL) { 1011 v->iov_base = greetings; 1012 v->iov_len = snprintf(greetings, sizeof greetings, 1013 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1014 f->f_prevhost, ctime(&now)); 1015 if (v->iov_len > 0) 1016 v++; 1017 v->iov_base = nul; 1018 v->iov_len = 0; 1019 v++; 1020 } else { 1021 v->iov_base = f->f_lasttime; 1022 v->iov_len = 15; 1023 v++; 1024 v->iov_base = space; 1025 v->iov_len = 1; 1026 v++; 1027 } 1028 1029 if (LogFacPri) { 1030 static char fp_buf[30]; /* Hollow laugh */ 1031 int fac = f->f_prevpri & LOG_FACMASK; 1032 int pri = LOG_PRI(f->f_prevpri); 1033 const char *f_s = NULL; 1034 char f_n[5]; /* Hollow laugh */ 1035 const char *p_s = NULL; 1036 char p_n[5]; /* Hollow laugh */ 1037 1038 if (LogFacPri > 1) { 1039 CODE *c; 1040 1041 for (c = facilitynames; c->c_name; c++) { 1042 if (c->c_val == fac) { 1043 f_s = c->c_name; 1044 break; 1045 } 1046 } 1047 for (c = prioritynames; c->c_name; c++) { 1048 if (c->c_val == pri) { 1049 p_s = c->c_name; 1050 break; 1051 } 1052 } 1053 } 1054 if (!f_s) { 1055 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1056 f_s = f_n; 1057 } 1058 if (!p_s) { 1059 snprintf(p_n, sizeof p_n, "%d", pri); 1060 p_s = p_n; 1061 } 1062 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1063 v->iov_base = fp_buf; 1064 v->iov_len = strlen(fp_buf); 1065 } else { 1066 v->iov_base = nul; 1067 v->iov_len = 0; 1068 } 1069 v++; 1070 1071 v->iov_base = f->f_prevhost; 1072 v->iov_len = strlen(v->iov_base); 1073 v++; 1074 v->iov_base = space; 1075 v->iov_len = 1; 1076 v++; 1077 1078 if (msg) { 1079 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1080 if (wmsg == NULL) { 1081 logerror("strdup"); 1082 exit(1); 1083 } 1084 v->iov_base = wmsg; 1085 v->iov_len = strlen(msg); 1086 } else if (f->f_prevcount > 1) { 1087 v->iov_base = repbuf; 1088 v->iov_len = snprintf(repbuf, sizeof repbuf, 1089 "last message repeated %d times", f->f_prevcount); 1090 } else { 1091 v->iov_base = f->f_prevline; 1092 v->iov_len = f->f_prevlen; 1093 } 1094 v++; 1095 1096 dprintf("Logging to %s", TypeNames[f->f_type]); 1097 f->f_time = now; 1098 1099 switch (f->f_type) { 1100 case F_UNUSED: 1101 dprintf("\n"); 1102 break; 1103 1104 case F_FORW: 1105 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1106 /* check for local vs remote messages */ 1107 if (strcasecmp(f->f_prevhost, LocalHostName)) 1108 l = snprintf(line, sizeof line - 1, 1109 "<%d>%.15s Forwarded from %s: %s", 1110 f->f_prevpri, (char *)iov[0].iov_base, 1111 f->f_prevhost, (char *)iov[5].iov_base); 1112 else 1113 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1114 f->f_prevpri, (char *)iov[0].iov_base, 1115 (char *)iov[5].iov_base); 1116 if (l < 0) 1117 l = 0; 1118 else if (l > MAXLINE) 1119 l = MAXLINE; 1120 1121 if (finet) { 1122 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1123 for (i = 0; i < *finet; i++) { 1124 #if 0 1125 /* 1126 * should we check AF first, or just 1127 * trial and error? FWD 1128 */ 1129 if (r->ai_family == 1130 address_family_of(finet[i+1])) 1131 #endif 1132 lsent = sendto(finet[i+1], line, l, 0, 1133 r->ai_addr, r->ai_addrlen); 1134 if (lsent == l) 1135 break; 1136 } 1137 if (lsent == l && !send_to_all) 1138 break; 1139 } 1140 dprintf("lsent/l: %d/%d\n", lsent, l); 1141 if (lsent != l) { 1142 int e = errno; 1143 logerror("sendto"); 1144 errno = e; 1145 switch (errno) { 1146 case EHOSTUNREACH: 1147 case EHOSTDOWN: 1148 break; 1149 /* case EBADF: */ 1150 /* case EACCES: */ 1151 /* case ENOTSOCK: */ 1152 /* case EFAULT: */ 1153 /* case EMSGSIZE: */ 1154 /* case EAGAIN: */ 1155 /* case ENOBUFS: */ 1156 /* case ECONNREFUSED: */ 1157 default: 1158 dprintf("removing entry\n"); 1159 f->f_type = F_UNUSED; 1160 break; 1161 } 1162 } 1163 } 1164 break; 1165 1166 case F_FILE: 1167 dprintf(" %s\n", f->f_un.f_fname); 1168 v->iov_base = lf; 1169 v->iov_len = 1; 1170 if (writev(f->f_file, iov, 7) < 0) { 1171 int e = errno; 1172 (void)close(f->f_file); 1173 f->f_type = F_UNUSED; 1174 errno = e; 1175 logerror(f->f_un.f_fname); 1176 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1177 f->f_flags |= FFLAG_NEEDSYNC; 1178 needdofsync = 1; 1179 } 1180 break; 1181 1182 case F_PIPE: 1183 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1184 v->iov_base = lf; 1185 v->iov_len = 1; 1186 if (f->f_un.f_pipe.f_pid == 0) { 1187 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1188 &f->f_un.f_pipe.f_pid)) < 0) { 1189 f->f_type = F_UNUSED; 1190 logerror(f->f_un.f_pipe.f_pname); 1191 break; 1192 } 1193 } 1194 if (writev(f->f_file, iov, 7) < 0) { 1195 int e = errno; 1196 (void)close(f->f_file); 1197 if (f->f_un.f_pipe.f_pid > 0) 1198 deadq_enter(f->f_un.f_pipe.f_pid, 1199 f->f_un.f_pipe.f_pname); 1200 f->f_un.f_pipe.f_pid = 0; 1201 errno = e; 1202 logerror(f->f_un.f_pipe.f_pname); 1203 } 1204 break; 1205 1206 case F_CONSOLE: 1207 if (flags & IGN_CONS) { 1208 dprintf(" (ignored)\n"); 1209 break; 1210 } 1211 /* FALLTHROUGH */ 1212 1213 case F_TTY: 1214 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1215 v->iov_base = crlf; 1216 v->iov_len = 2; 1217 1218 errno = 0; /* ttymsg() only sometimes returns an errno */ 1219 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1220 f->f_type = F_UNUSED; 1221 logerror(msgret); 1222 } 1223 break; 1224 1225 case F_USERS: 1226 case F_WALL: 1227 dprintf("\n"); 1228 v->iov_base = crlf; 1229 v->iov_len = 2; 1230 wallmsg(f, iov); 1231 break; 1232 } 1233 f->f_prevcount = 0; 1234 if (msg) 1235 free(wmsg); 1236 } 1237 1238 /* 1239 * WALLMSG -- Write a message to the world at large 1240 * 1241 * Write the specified message to either the entire 1242 * world, or a list of approved users. 1243 */ 1244 static void 1245 wallmsg(struct filed *f, struct iovec *iov) 1246 { 1247 static int reenter; /* avoid calling ourselves */ 1248 FILE *uf; 1249 struct utmp ut; 1250 int i; 1251 const char *p; 1252 char line[sizeof(ut.ut_line) + 1]; 1253 1254 if (reenter++) 1255 return; 1256 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1257 logerror(_PATH_UTMP); 1258 reenter = 0; 1259 return; 1260 } 1261 /* NOSTRICT */ 1262 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1263 if (ut.ut_name[0] == '\0') 1264 continue; 1265 /* We must use strncpy since ut_* may not be NUL terminated. */ 1266 strncpy(line, ut.ut_line, sizeof(line) - 1); 1267 line[sizeof(line) - 1] = '\0'; 1268 if (f->f_type == F_WALL) { 1269 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1270 errno = 0; /* already in msg */ 1271 logerror(p); 1272 } 1273 continue; 1274 } 1275 /* should we send the message to this user? */ 1276 for (i = 0; i < MAXUNAMES; i++) { 1277 if (!f->f_un.f_uname[i][0]) 1278 break; 1279 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1280 UT_NAMESIZE)) { 1281 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1282 != NULL) { 1283 errno = 0; /* already in msg */ 1284 logerror(p); 1285 } 1286 break; 1287 } 1288 } 1289 } 1290 (void)fclose(uf); 1291 reenter = 0; 1292 } 1293 1294 static void 1295 reapchild(int signo __unused) 1296 { 1297 int status; 1298 pid_t pid; 1299 struct filed *f; 1300 1301 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1302 if (!Initialized) 1303 /* Don't tell while we are initting. */ 1304 continue; 1305 1306 /* First, look if it's a process from the dead queue. */ 1307 if (deadq_remove(pid)) 1308 goto oncemore; 1309 1310 /* Now, look in list of active processes. */ 1311 for (f = Files; f; f = f->f_next) 1312 if (f->f_type == F_PIPE && 1313 f->f_un.f_pipe.f_pid == pid) { 1314 (void)close(f->f_file); 1315 f->f_un.f_pipe.f_pid = 0; 1316 log_deadchild(pid, status, 1317 f->f_un.f_pipe.f_pname); 1318 break; 1319 } 1320 oncemore: 1321 continue; 1322 } 1323 } 1324 1325 /* 1326 * Return a printable representation of a host address. 1327 */ 1328 static const char * 1329 cvthname(struct sockaddr *f) 1330 { 1331 int error, hl; 1332 sigset_t omask, nmask; 1333 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1334 1335 error = getnameinfo((struct sockaddr *)f, 1336 ((struct sockaddr *)f)->sa_len, 1337 ip, sizeof ip, NULL, 0, 1338 NI_NUMERICHOST | withscopeid); 1339 dprintf("cvthname(%s)\n", ip); 1340 1341 if (error) { 1342 dprintf("Malformed from address %s\n", gai_strerror(error)); 1343 return ("???"); 1344 } 1345 if (!resolve) 1346 return (ip); 1347 1348 sigemptyset(&nmask); 1349 sigaddset(&nmask, SIGHUP); 1350 sigprocmask(SIG_BLOCK, &nmask, &omask); 1351 error = getnameinfo((struct sockaddr *)f, 1352 ((struct sockaddr *)f)->sa_len, 1353 hname, sizeof hname, NULL, 0, 1354 NI_NAMEREQD | withscopeid); 1355 sigprocmask(SIG_SETMASK, &omask, NULL); 1356 if (error) { 1357 dprintf("Host name for your address (%s) unknown\n", ip); 1358 return (ip); 1359 } 1360 hl = strlen(hname); 1361 if (hl > 0 && hname[hl-1] == '.') 1362 hname[--hl] = '\0'; 1363 trimdomain(hname, hl); 1364 return (hname); 1365 } 1366 1367 static void 1368 dodie(int signo) 1369 { 1370 1371 WantDie = signo; 1372 } 1373 1374 static void 1375 domark(int signo __unused) 1376 { 1377 1378 MarkSet = 1; 1379 } 1380 1381 /* 1382 * Print syslogd errors some place. 1383 */ 1384 static void 1385 logerror(const char *type) 1386 { 1387 char buf[512]; 1388 static int recursed = 0; 1389 1390 /* If there's an error while trying to log an error, give up. */ 1391 if (recursed) 1392 return; 1393 recursed++; 1394 if (errno) 1395 (void)snprintf(buf, 1396 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1397 else 1398 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1399 errno = 0; 1400 dprintf("%s\n", buf); 1401 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1402 recursed--; 1403 } 1404 1405 static void 1406 die(int signo) 1407 { 1408 struct filed *f; 1409 int was_initialized; 1410 char buf[100]; 1411 int i; 1412 1413 was_initialized = Initialized; 1414 Initialized = 0; /* Don't log SIGCHLDs. */ 1415 for (f = Files; f != NULL; f = f->f_next) { 1416 /* flush any pending output */ 1417 if (f->f_prevcount) 1418 fprintlog(f, 0, (char *)NULL); 1419 if (f->f_type == F_PIPE && f->f_un.f_pipe.f_pid > 0) { 1420 (void)close(f->f_file); 1421 f->f_un.f_pipe.f_pid = 0; 1422 } 1423 } 1424 Initialized = was_initialized; 1425 if (signo) { 1426 dprintf("syslogd: exiting on signal %d\n", signo); 1427 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1428 errno = 0; 1429 logerror(buf); 1430 } 1431 for (i = 0; i < nfunix; i++) 1432 if (funixn[i] && funix[i] != -1) 1433 (void)unlink(funixn[i]); 1434 exit(1); 1435 } 1436 1437 /* 1438 * INIT -- Initialize syslogd from configuration table 1439 */ 1440 static void 1441 init(int signo) 1442 { 1443 int i; 1444 FILE *cf; 1445 struct filed *f, *next, **nextp; 1446 char *p; 1447 char cline[LINE_MAX]; 1448 char prog[NAME_MAX+1]; 1449 char host[MAXHOSTNAMELEN]; 1450 char oldLocalHostName[MAXHOSTNAMELEN]; 1451 char hostMsg[2*MAXHOSTNAMELEN+40]; 1452 char bootfileMsg[LINE_MAX]; 1453 1454 dprintf("init\n"); 1455 1456 /* 1457 * Load hostname (may have changed). 1458 */ 1459 if (signo != 0) 1460 (void)strlcpy(oldLocalHostName, LocalHostName, 1461 sizeof(oldLocalHostName)); 1462 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1463 err(EX_OSERR, "gethostname() failed"); 1464 if ((p = strchr(LocalHostName, '.')) != NULL) { 1465 *p++ = '\0'; 1466 LocalDomain = p; 1467 } else { 1468 LocalDomain = ""; 1469 } 1470 1471 /* 1472 * Close all open log files. 1473 */ 1474 Initialized = 0; 1475 for (f = Files; f != NULL; f = next) { 1476 /* flush any pending output */ 1477 if (f->f_prevcount) 1478 fprintlog(f, 0, (char *)NULL); 1479 1480 switch (f->f_type) { 1481 case F_FILE: 1482 case F_FORW: 1483 case F_CONSOLE: 1484 case F_TTY: 1485 (void)close(f->f_file); 1486 break; 1487 case F_PIPE: 1488 if (f->f_un.f_pipe.f_pid > 0) { 1489 (void)close(f->f_file); 1490 deadq_enter(f->f_un.f_pipe.f_pid, 1491 f->f_un.f_pipe.f_pname); 1492 } 1493 f->f_un.f_pipe.f_pid = 0; 1494 break; 1495 } 1496 next = f->f_next; 1497 if (f->f_program) free(f->f_program); 1498 if (f->f_host) free(f->f_host); 1499 free((char *)f); 1500 } 1501 Files = NULL; 1502 nextp = &Files; 1503 1504 /* open the configuration file */ 1505 if ((cf = fopen(ConfFile, "r")) == NULL) { 1506 dprintf("cannot open %s\n", ConfFile); 1507 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1508 if (*nextp == NULL) { 1509 logerror("calloc"); 1510 exit(1); 1511 } 1512 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1513 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1514 if ((*nextp)->f_next == NULL) { 1515 logerror("calloc"); 1516 exit(1); 1517 } 1518 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1519 Initialized = 1; 1520 return; 1521 } 1522 1523 /* 1524 * Foreach line in the conf table, open that file. 1525 */ 1526 f = NULL; 1527 (void)strlcpy(host, "*", sizeof(host)); 1528 (void)strlcpy(prog, "*", sizeof(prog)); 1529 while (fgets(cline, sizeof(cline), cf) != NULL) { 1530 /* 1531 * check for end-of-section, comments, strip off trailing 1532 * spaces and newline character. #!prog is treated specially: 1533 * following lines apply only to that program. 1534 */ 1535 for (p = cline; isspace(*p); ++p) 1536 continue; 1537 if (*p == 0) 1538 continue; 1539 if (*p == '#') { 1540 p++; 1541 if (*p != '!' && *p != '+' && *p != '-') 1542 continue; 1543 } 1544 if (*p == '+' || *p == '-') { 1545 host[0] = *p++; 1546 while (isspace(*p)) 1547 p++; 1548 if ((!*p) || (*p == '*')) { 1549 (void)strlcpy(host, "*", sizeof(host)); 1550 continue; 1551 } 1552 if (*p == '@') 1553 p = LocalHostName; 1554 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1555 if (!isalnum(*p) && *p != '.' && *p != '-' 1556 && *p != ',') 1557 break; 1558 host[i] = *p++; 1559 } 1560 host[i] = '\0'; 1561 continue; 1562 } 1563 if (*p == '!') { 1564 p++; 1565 while (isspace(*p)) p++; 1566 if ((!*p) || (*p == '*')) { 1567 (void)strlcpy(prog, "*", sizeof(prog)); 1568 continue; 1569 } 1570 for (i = 0; i < NAME_MAX; i++) { 1571 if (!isprint(p[i])) 1572 break; 1573 prog[i] = p[i]; 1574 } 1575 prog[i] = 0; 1576 continue; 1577 } 1578 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1579 cline[i] = '\0'; 1580 f = (struct filed *)calloc(1, sizeof(*f)); 1581 if (f == NULL) { 1582 logerror("calloc"); 1583 exit(1); 1584 } 1585 *nextp = f; 1586 nextp = &f->f_next; 1587 cfline(cline, f, prog, host); 1588 } 1589 1590 /* close the configuration file */ 1591 (void)fclose(cf); 1592 1593 Initialized = 1; 1594 1595 if (Debug) { 1596 for (f = Files; f; f = f->f_next) { 1597 for (i = 0; i <= LOG_NFACILITIES; i++) 1598 if (f->f_pmask[i] == INTERNAL_NOPRI) 1599 printf("X "); 1600 else 1601 printf("%d ", f->f_pmask[i]); 1602 printf("%s: ", TypeNames[f->f_type]); 1603 switch (f->f_type) { 1604 case F_FILE: 1605 printf("%s", f->f_un.f_fname); 1606 break; 1607 1608 case F_CONSOLE: 1609 case F_TTY: 1610 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1611 break; 1612 1613 case F_FORW: 1614 printf("%s", f->f_un.f_forw.f_hname); 1615 break; 1616 1617 case F_PIPE: 1618 printf("%s", f->f_un.f_pipe.f_pname); 1619 break; 1620 1621 case F_USERS: 1622 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1623 printf("%s, ", f->f_un.f_uname[i]); 1624 break; 1625 } 1626 if (f->f_program) 1627 printf(" (%s)", f->f_program); 1628 printf("\n"); 1629 } 1630 } 1631 1632 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1633 dprintf("syslogd: restarted\n"); 1634 /* 1635 * Log a change in hostname, but only on a restart. 1636 */ 1637 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1638 (void)snprintf(hostMsg, sizeof(hostMsg), 1639 "syslogd: hostname changed, \"%s\" to \"%s\"", 1640 oldLocalHostName, LocalHostName); 1641 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1642 dprintf("%s\n", hostMsg); 1643 } 1644 /* 1645 * Log the kernel boot file if we aren't going to use it as 1646 * the prefix, and if this is *not* a restart. 1647 */ 1648 if (signo == 0 && !use_bootfile) { 1649 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1650 "syslogd: kernel boot file is %s", bootfile); 1651 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1652 dprintf("%s\n", bootfileMsg); 1653 } 1654 } 1655 1656 /* 1657 * Crack a configuration file line 1658 */ 1659 static void 1660 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1661 { 1662 struct addrinfo hints, *res; 1663 int error, i, pri, syncfile; 1664 const char *p, *q; 1665 char *bp; 1666 char buf[MAXLINE], ebuf[100]; 1667 1668 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1669 1670 errno = 0; /* keep strerror() stuff out of logerror messages */ 1671 1672 /* clear out file entry */ 1673 memset(f, 0, sizeof(*f)); 1674 for (i = 0; i <= LOG_NFACILITIES; i++) 1675 f->f_pmask[i] = INTERNAL_NOPRI; 1676 1677 /* save hostname if any */ 1678 if (host && *host == '*') 1679 host = NULL; 1680 if (host) { 1681 int hl; 1682 1683 f->f_host = strdup(host); 1684 if (f->f_host == NULL) { 1685 logerror("strdup"); 1686 exit(1); 1687 } 1688 hl = strlen(f->f_host); 1689 if (hl > 0 && f->f_host[hl-1] == '.') 1690 f->f_host[--hl] = '\0'; 1691 trimdomain(f->f_host, hl); 1692 } 1693 1694 /* save program name if any */ 1695 if (prog && *prog == '*') 1696 prog = NULL; 1697 if (prog) { 1698 f->f_program = strdup(prog); 1699 if (f->f_program == NULL) { 1700 logerror("strdup"); 1701 exit(1); 1702 } 1703 } 1704 1705 /* scan through the list of selectors */ 1706 for (p = line; *p && *p != '\t' && *p != ' ';) { 1707 int pri_done; 1708 int pri_cmp; 1709 int pri_invert; 1710 1711 /* find the end of this facility name list */ 1712 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1713 continue; 1714 1715 /* get the priority comparison */ 1716 pri_cmp = 0; 1717 pri_done = 0; 1718 pri_invert = 0; 1719 if (*q == '!') { 1720 pri_invert = 1; 1721 q++; 1722 } 1723 while (!pri_done) { 1724 switch (*q) { 1725 case '<': 1726 pri_cmp |= PRI_LT; 1727 q++; 1728 break; 1729 case '=': 1730 pri_cmp |= PRI_EQ; 1731 q++; 1732 break; 1733 case '>': 1734 pri_cmp |= PRI_GT; 1735 q++; 1736 break; 1737 default: 1738 pri_done++; 1739 break; 1740 } 1741 } 1742 1743 /* collect priority name */ 1744 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1745 *bp++ = *q++; 1746 *bp = '\0'; 1747 1748 /* skip cruft */ 1749 while (strchr(",;", *q)) 1750 q++; 1751 1752 /* decode priority name */ 1753 if (*buf == '*') { 1754 pri = LOG_PRIMASK + 1; 1755 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1756 } else { 1757 /* Ignore trailing spaces. */ 1758 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1759 buf[i] = '\0'; 1760 1761 pri = decode(buf, prioritynames); 1762 if (pri < 0) { 1763 (void)snprintf(ebuf, sizeof ebuf, 1764 "unknown priority name \"%s\"", buf); 1765 logerror(ebuf); 1766 return; 1767 } 1768 } 1769 if (!pri_cmp) 1770 pri_cmp = (UniquePriority) 1771 ? (PRI_EQ) 1772 : (PRI_EQ | PRI_GT) 1773 ; 1774 if (pri_invert) 1775 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1776 1777 /* scan facilities */ 1778 while (*p && !strchr("\t.; ", *p)) { 1779 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1780 *bp++ = *p++; 1781 *bp = '\0'; 1782 1783 if (*buf == '*') { 1784 for (i = 0; i < LOG_NFACILITIES; i++) { 1785 f->f_pmask[i] = pri; 1786 f->f_pcmp[i] = pri_cmp; 1787 } 1788 } else { 1789 i = decode(buf, facilitynames); 1790 if (i < 0) { 1791 (void)snprintf(ebuf, sizeof ebuf, 1792 "unknown facility name \"%s\"", 1793 buf); 1794 logerror(ebuf); 1795 return; 1796 } 1797 f->f_pmask[i >> 3] = pri; 1798 f->f_pcmp[i >> 3] = pri_cmp; 1799 } 1800 while (*p == ',' || *p == ' ') 1801 p++; 1802 } 1803 1804 p = q; 1805 } 1806 1807 /* skip to action part */ 1808 while (*p == '\t' || *p == ' ') 1809 p++; 1810 1811 if (*p == '-') { 1812 syncfile = 0; 1813 p++; 1814 } else 1815 syncfile = 1; 1816 1817 switch (*p) { 1818 case '@': 1819 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1820 sizeof(f->f_un.f_forw.f_hname)); 1821 memset(&hints, 0, sizeof(hints)); 1822 hints.ai_family = family; 1823 hints.ai_socktype = SOCK_DGRAM; 1824 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1825 &res); 1826 if (error) { 1827 logerror(gai_strerror(error)); 1828 break; 1829 } 1830 f->f_un.f_forw.f_addr = res; 1831 f->f_type = F_FORW; 1832 break; 1833 1834 case '/': 1835 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1836 f->f_type = F_UNUSED; 1837 logerror(p); 1838 break; 1839 } 1840 if (syncfile) 1841 f->f_flags |= FFLAG_SYNC; 1842 if (isatty(f->f_file)) { 1843 if (strcmp(p, ctty) == 0) 1844 f->f_type = F_CONSOLE; 1845 else 1846 f->f_type = F_TTY; 1847 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1848 sizeof(f->f_un.f_fname)); 1849 } else { 1850 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1851 f->f_type = F_FILE; 1852 } 1853 break; 1854 1855 case '|': 1856 f->f_un.f_pipe.f_pid = 0; 1857 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1858 f->f_type = F_PIPE; 1859 break; 1860 1861 case '*': 1862 f->f_type = F_WALL; 1863 break; 1864 1865 default: 1866 for (i = 0; i < MAXUNAMES && *p; i++) { 1867 for (q = p; *q && *q != ','; ) 1868 q++; 1869 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1870 if ((q - p) > UT_NAMESIZE) 1871 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1872 else 1873 f->f_un.f_uname[i][q - p] = '\0'; 1874 while (*q == ',' || *q == ' ') 1875 q++; 1876 p = q; 1877 } 1878 f->f_type = F_USERS; 1879 break; 1880 } 1881 } 1882 1883 1884 /* 1885 * Decode a symbolic name to a numeric value 1886 */ 1887 static int 1888 decode(const char *name, CODE *codetab) 1889 { 1890 CODE *c; 1891 char *p, buf[40]; 1892 1893 if (isdigit(*name)) 1894 return (atoi(name)); 1895 1896 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1897 if (isupper(*name)) 1898 *p = tolower(*name); 1899 else 1900 *p = *name; 1901 } 1902 *p = '\0'; 1903 for (c = codetab; c->c_name; c++) 1904 if (!strcmp(buf, c->c_name)) 1905 return (c->c_val); 1906 1907 return (-1); 1908 } 1909 1910 static void 1911 markit(void) 1912 { 1913 struct filed *f; 1914 dq_t q, next; 1915 1916 now = time((time_t *)NULL); 1917 MarkSeq += TIMERINTVL; 1918 if (MarkSeq >= MarkInterval) { 1919 logmsg(LOG_INFO, "-- MARK --", 1920 LocalHostName, ADDDATE|MARK); 1921 MarkSeq = 0; 1922 } 1923 1924 for (f = Files; f; f = f->f_next) { 1925 if (f->f_prevcount && now >= REPEATTIME(f)) { 1926 dprintf("flush %s: repeated %d times, %d sec.\n", 1927 TypeNames[f->f_type], f->f_prevcount, 1928 repeatinterval[f->f_repeatcount]); 1929 fprintlog(f, 0, (char *)NULL); 1930 BACKOFF(f); 1931 } 1932 } 1933 1934 /* Walk the dead queue, and see if we should signal somebody. */ 1935 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1936 next = TAILQ_NEXT(q, dq_entries); 1937 1938 switch (q->dq_timeout) { 1939 case 0: 1940 /* Already signalled once, try harder now. */ 1941 if (kill(q->dq_pid, SIGKILL) != 0) 1942 (void)deadq_remove(q->dq_pid); 1943 break; 1944 1945 case 1: 1946 /* 1947 * Timed out on dead queue, send terminate 1948 * signal. Note that we leave the removal 1949 * from the dead queue to reapchild(), which 1950 * will also log the event (unless the process 1951 * didn't even really exist, in case we simply 1952 * drop it from the dead queue). 1953 */ 1954 if (kill(q->dq_pid, SIGTERM) != 0) 1955 (void)deadq_remove(q->dq_pid); 1956 /* FALLTHROUGH */ 1957 1958 default: 1959 q->dq_timeout--; 1960 } 1961 } 1962 MarkSet = 0; 1963 (void)alarm(TIMERINTVL); 1964 } 1965 1966 /* 1967 * fork off and become a daemon, but wait for the child to come online 1968 * before returing to the parent, or we get disk thrashing at boot etc. 1969 * Set a timer so we don't hang forever if it wedges. 1970 */ 1971 static int 1972 waitdaemon(int nochdir, int noclose, int maxwait) 1973 { 1974 int fd; 1975 int status; 1976 pid_t pid, childpid; 1977 1978 switch (childpid = fork()) { 1979 case -1: 1980 return (-1); 1981 case 0: 1982 break; 1983 default: 1984 signal(SIGALRM, timedout); 1985 alarm(maxwait); 1986 while ((pid = wait3(&status, 0, NULL)) != -1) { 1987 if (WIFEXITED(status)) 1988 errx(1, "child pid %d exited with return code %d", 1989 pid, WEXITSTATUS(status)); 1990 if (WIFSIGNALED(status)) 1991 errx(1, "child pid %d exited on signal %d%s", 1992 pid, WTERMSIG(status), 1993 WCOREDUMP(status) ? " (core dumped)" : 1994 ""); 1995 if (pid == childpid) /* it's gone... */ 1996 break; 1997 } 1998 exit(0); 1999 } 2000 2001 if (setsid() == -1) 2002 return (-1); 2003 2004 if (!nochdir) 2005 (void)chdir("/"); 2006 2007 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2008 (void)dup2(fd, STDIN_FILENO); 2009 (void)dup2(fd, STDOUT_FILENO); 2010 (void)dup2(fd, STDERR_FILENO); 2011 if (fd > 2) 2012 (void)close (fd); 2013 } 2014 return (getppid()); 2015 } 2016 2017 /* 2018 * We get a SIGALRM from the child when it's running and finished doing it's 2019 * fsync()'s or O_SYNC writes for all the boot messages. 2020 * 2021 * We also get a signal from the kernel if the timer expires, so check to 2022 * see what happened. 2023 */ 2024 static void 2025 timedout(int sig __unused) 2026 { 2027 int left; 2028 left = alarm(0); 2029 signal(SIGALRM, SIG_DFL); 2030 if (left == 0) 2031 errx(1, "timed out waiting for child"); 2032 else 2033 _exit(0); 2034 } 2035 2036 /* 2037 * Add `s' to the list of allowable peer addresses to accept messages 2038 * from. 2039 * 2040 * `s' is a string in the form: 2041 * 2042 * [*]domainname[:{servicename|portnumber|*}] 2043 * 2044 * or 2045 * 2046 * netaddr/maskbits[:{servicename|portnumber|*}] 2047 * 2048 * Returns -1 on error, 0 if the argument was valid. 2049 */ 2050 static int 2051 allowaddr(char *s) 2052 { 2053 char *cp1, *cp2; 2054 struct allowedpeer ap; 2055 struct servent *se; 2056 int masklen = -1, i; 2057 struct addrinfo hints, *res; 2058 struct in_addr *addrp, *maskp; 2059 u_int32_t *addr6p, *mask6p; 2060 char ip[NI_MAXHOST]; 2061 2062 #ifdef INET6 2063 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2064 #endif 2065 cp1 = s; 2066 if ((cp1 = strrchr(cp1, ':'))) { 2067 /* service/port provided */ 2068 *cp1++ = '\0'; 2069 if (strlen(cp1) == 1 && *cp1 == '*') 2070 /* any port allowed */ 2071 ap.port = 0; 2072 else if ((se = getservbyname(cp1, "udp"))) { 2073 ap.port = ntohs(se->s_port); 2074 } else { 2075 ap.port = strtol(cp1, &cp2, 0); 2076 if (*cp2 != '\0') 2077 return (-1); /* port not numeric */ 2078 } 2079 } else { 2080 if ((se = getservbyname("syslog", "udp"))) 2081 ap.port = ntohs(se->s_port); 2082 else 2083 /* sanity, should not happen */ 2084 ap.port = 514; 2085 } 2086 2087 if ((cp1 = strchr(s, '/')) != NULL && 2088 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2089 *cp1 = '\0'; 2090 if ((masklen = atoi(cp1 + 1)) < 0) 2091 return (-1); 2092 } 2093 #ifdef INET6 2094 if (*s == '[') { 2095 cp2 = s + strlen(s) - 1; 2096 if (*cp2 == ']') { 2097 ++s; 2098 *cp2 = '\0'; 2099 } else { 2100 cp2 = NULL; 2101 } 2102 } else { 2103 cp2 = NULL; 2104 } 2105 #endif 2106 memset(&hints, 0, sizeof(hints)); 2107 hints.ai_family = PF_UNSPEC; 2108 hints.ai_socktype = SOCK_DGRAM; 2109 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2110 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2111 ap.isnumeric = 1; 2112 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2113 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2114 ap.a_mask.ss_family = res->ai_family; 2115 if (res->ai_family == AF_INET) { 2116 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2117 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2118 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2119 if (masklen < 0) { 2120 /* use default netmask */ 2121 if (IN_CLASSA(ntohl(addrp->s_addr))) 2122 maskp->s_addr = htonl(IN_CLASSA_NET); 2123 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2124 maskp->s_addr = htonl(IN_CLASSB_NET); 2125 else 2126 maskp->s_addr = htonl(IN_CLASSC_NET); 2127 } else if (masklen <= 32) { 2128 /* convert masklen to netmask */ 2129 if (masklen == 0) 2130 maskp->s_addr = 0; 2131 else 2132 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2133 } else { 2134 freeaddrinfo(res); 2135 return (-1); 2136 } 2137 /* Lose any host bits in the network number. */ 2138 addrp->s_addr &= maskp->s_addr; 2139 } 2140 #ifdef INET6 2141 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2142 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2143 if (masklen < 0) 2144 masklen = 128; 2145 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2146 /* convert masklen to netmask */ 2147 while (masklen > 0) { 2148 if (masklen < 32) { 2149 *mask6p = htonl(~(0xffffffff >> masklen)); 2150 break; 2151 } 2152 *mask6p++ = 0xffffffff; 2153 masklen -= 32; 2154 } 2155 /* Lose any host bits in the network number. */ 2156 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2157 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2158 for (i = 0; i < 4; i++) 2159 addr6p[i] &= mask6p[i]; 2160 } 2161 #endif 2162 else { 2163 freeaddrinfo(res); 2164 return (-1); 2165 } 2166 freeaddrinfo(res); 2167 } else { 2168 /* arg `s' is domain name */ 2169 ap.isnumeric = 0; 2170 ap.a_name = s; 2171 if (cp1) 2172 *cp1 = '/'; 2173 #ifdef INET6 2174 if (cp2) { 2175 *cp2 = ']'; 2176 --s; 2177 } 2178 #endif 2179 } 2180 2181 if (Debug) { 2182 printf("allowaddr: rule %d: ", NumAllowed); 2183 if (ap.isnumeric) { 2184 printf("numeric, "); 2185 getnameinfo((struct sockaddr *)&ap.a_addr, 2186 ((struct sockaddr *)&ap.a_addr)->sa_len, 2187 ip, sizeof ip, NULL, 0, 2188 NI_NUMERICHOST | withscopeid); 2189 printf("addr = %s, ", ip); 2190 getnameinfo((struct sockaddr *)&ap.a_mask, 2191 ((struct sockaddr *)&ap.a_mask)->sa_len, 2192 ip, sizeof ip, NULL, 0, 2193 NI_NUMERICHOST | withscopeid); 2194 printf("mask = %s; ", ip); 2195 } else { 2196 printf("domainname = %s; ", ap.a_name); 2197 } 2198 printf("port = %d\n", ap.port); 2199 } 2200 2201 if ((AllowedPeers = realloc(AllowedPeers, 2202 ++NumAllowed * sizeof(struct allowedpeer))) 2203 == NULL) { 2204 logerror("realloc"); 2205 exit(1); 2206 } 2207 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2208 return (0); 2209 } 2210 2211 /* 2212 * Validate that the remote peer has permission to log to us. 2213 */ 2214 static int 2215 validate(struct sockaddr *sa, const char *hname) 2216 { 2217 int i, j, reject; 2218 size_t l1, l2; 2219 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2220 struct allowedpeer *ap; 2221 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2222 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2223 struct addrinfo hints, *res; 2224 u_short sport; 2225 2226 if (NumAllowed == 0) 2227 /* traditional behaviour, allow everything */ 2228 return (1); 2229 2230 (void)strlcpy(name, hname, sizeof(name)); 2231 memset(&hints, 0, sizeof(hints)); 2232 hints.ai_family = PF_UNSPEC; 2233 hints.ai_socktype = SOCK_DGRAM; 2234 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2235 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2236 freeaddrinfo(res); 2237 else if (strchr(name, '.') == NULL) { 2238 strlcat(name, ".", sizeof name); 2239 strlcat(name, LocalDomain, sizeof name); 2240 } 2241 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2242 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2243 return (0); /* for safety, should not occur */ 2244 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2245 ip, port, name); 2246 sport = atoi(port); 2247 2248 /* now, walk down the list */ 2249 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2250 if (ap->port != 0 && ap->port != sport) { 2251 dprintf("rejected in rule %d due to port mismatch.\n", i); 2252 continue; 2253 } 2254 2255 if (ap->isnumeric) { 2256 if (ap->a_addr.ss_family != sa->sa_family) { 2257 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2258 continue; 2259 } 2260 if (ap->a_addr.ss_family == AF_INET) { 2261 sin4 = (struct sockaddr_in *)sa; 2262 a4p = (struct sockaddr_in *)&ap->a_addr; 2263 m4p = (struct sockaddr_in *)&ap->a_mask; 2264 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2265 != a4p->sin_addr.s_addr) { 2266 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2267 continue; 2268 } 2269 } 2270 #ifdef INET6 2271 else if (ap->a_addr.ss_family == AF_INET6) { 2272 sin6 = (struct sockaddr_in6 *)sa; 2273 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2274 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2275 #ifdef NI_WITHSCOPEID 2276 if (a6p->sin6_scope_id != 0 && 2277 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2278 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2279 continue; 2280 } 2281 #endif 2282 reject = 0; 2283 for (j = 0; j < 16; j += 4) { 2284 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2285 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2286 ++reject; 2287 break; 2288 } 2289 } 2290 if (reject) { 2291 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2292 continue; 2293 } 2294 } 2295 #endif 2296 else 2297 continue; 2298 } else { 2299 cp = ap->a_name; 2300 l1 = strlen(name); 2301 if (*cp == '*') { 2302 /* allow wildmatch */ 2303 cp++; 2304 l2 = strlen(cp); 2305 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2306 dprintf("rejected in rule %d due to name mismatch.\n", i); 2307 continue; 2308 } 2309 } else { 2310 /* exact match */ 2311 l2 = strlen(cp); 2312 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2313 dprintf("rejected in rule %d due to name mismatch.\n", i); 2314 continue; 2315 } 2316 } 2317 } 2318 dprintf("accepted in rule %d.\n", i); 2319 return (1); /* hooray! */ 2320 } 2321 return (0); 2322 } 2323 2324 /* 2325 * Fairly similar to popen(3), but returns an open descriptor, as 2326 * opposed to a FILE *. 2327 */ 2328 static int 2329 p_open(const char *prog, pid_t *rpid) 2330 { 2331 int pfd[2], nulldesc, i; 2332 pid_t pid; 2333 sigset_t omask, mask; 2334 char *argv[4]; /* sh -c cmd NULL */ 2335 char errmsg[200]; 2336 2337 if (pipe(pfd) == -1) 2338 return (-1); 2339 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2340 /* we are royally screwed anyway */ 2341 return (-1); 2342 2343 sigemptyset(&mask); 2344 sigaddset(&mask, SIGALRM); 2345 sigaddset(&mask, SIGHUP); 2346 sigprocmask(SIG_BLOCK, &mask, &omask); 2347 switch ((pid = fork())) { 2348 case -1: 2349 sigprocmask(SIG_SETMASK, &omask, 0); 2350 close(nulldesc); 2351 return (-1); 2352 2353 case 0: 2354 argv[0] = strdup("sh"); 2355 argv[1] = strdup("-c"); 2356 argv[2] = strdup(prog); 2357 argv[3] = NULL; 2358 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2359 logerror("strdup"); 2360 exit(1); 2361 } 2362 2363 alarm(0); 2364 (void)setsid(); /* Avoid catching SIGHUPs. */ 2365 2366 /* 2367 * Throw away pending signals, and reset signal 2368 * behaviour to standard values. 2369 */ 2370 signal(SIGALRM, SIG_IGN); 2371 signal(SIGHUP, SIG_IGN); 2372 sigprocmask(SIG_SETMASK, &omask, 0); 2373 signal(SIGPIPE, SIG_DFL); 2374 signal(SIGQUIT, SIG_DFL); 2375 signal(SIGALRM, SIG_DFL); 2376 signal(SIGHUP, SIG_DFL); 2377 2378 dup2(pfd[0], STDIN_FILENO); 2379 dup2(nulldesc, STDOUT_FILENO); 2380 dup2(nulldesc, STDERR_FILENO); 2381 for (i = getdtablesize(); i > 2; i--) 2382 (void)close(i); 2383 2384 (void)execvp(_PATH_BSHELL, argv); 2385 _exit(255); 2386 } 2387 2388 sigprocmask(SIG_SETMASK, &omask, 0); 2389 close(nulldesc); 2390 close(pfd[0]); 2391 /* 2392 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2393 * supposed to get an EWOULDBLOCK on writev(2), which is 2394 * caught by the logic above anyway, which will in turn close 2395 * the pipe, and fork a new logging subprocess if necessary. 2396 * The stale subprocess will be killed some time later unless 2397 * it terminated itself due to closing its input pipe (so we 2398 * get rid of really dead puppies). 2399 */ 2400 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2401 /* This is bad. */ 2402 (void)snprintf(errmsg, sizeof errmsg, 2403 "Warning: cannot change pipe to PID %d to " 2404 "non-blocking behaviour.", 2405 (int)pid); 2406 logerror(errmsg); 2407 } 2408 *rpid = pid; 2409 return (pfd[1]); 2410 } 2411 2412 static void 2413 deadq_enter(pid_t pid, const char *name) 2414 { 2415 dq_t p; 2416 int status; 2417 2418 /* 2419 * Be paranoid, if we can't signal the process, don't enter it 2420 * into the dead queue (perhaps it's already dead). If possible, 2421 * we try to fetch and log the child's status. 2422 */ 2423 if (kill(pid, 0) != 0) { 2424 if (waitpid(pid, &status, WNOHANG) > 0) 2425 log_deadchild(pid, status, name); 2426 return; 2427 } 2428 2429 p = malloc(sizeof(struct deadq_entry)); 2430 if (p == NULL) { 2431 logerror("malloc"); 2432 exit(1); 2433 } 2434 2435 p->dq_pid = pid; 2436 p->dq_timeout = DQ_TIMO_INIT; 2437 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2438 } 2439 2440 static int 2441 deadq_remove(pid_t pid) 2442 { 2443 dq_t q; 2444 2445 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2446 if (q->dq_pid == pid) { 2447 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2448 free(q); 2449 return (1); 2450 } 2451 } 2452 2453 return (0); 2454 } 2455 2456 static void 2457 log_deadchild(pid_t pid, int status, const char *name) 2458 { 2459 int code; 2460 char buf[256]; 2461 const char *reason; 2462 2463 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2464 if (WIFSIGNALED(status)) { 2465 reason = "due to signal"; 2466 code = WTERMSIG(status); 2467 } else { 2468 reason = "with status"; 2469 code = WEXITSTATUS(status); 2470 if (code == 0) 2471 return; 2472 } 2473 (void)snprintf(buf, sizeof buf, 2474 "Logging subprocess %d (%s) exited %s %d.", 2475 pid, name, reason, code); 2476 logerror(buf); 2477 } 2478 2479 static int * 2480 socksetup(int af, const char *bindhostname) 2481 { 2482 struct addrinfo hints, *res, *r; 2483 int error, maxs, *s, *socks; 2484 2485 memset(&hints, 0, sizeof(hints)); 2486 hints.ai_flags = AI_PASSIVE; 2487 hints.ai_family = af; 2488 hints.ai_socktype = SOCK_DGRAM; 2489 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2490 if (error) { 2491 logerror(gai_strerror(error)); 2492 errno = 0; 2493 die(0); 2494 } 2495 2496 /* Count max number of sockets we may open */ 2497 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2498 socks = malloc((maxs+1) * sizeof(int)); 2499 if (socks == NULL) { 2500 logerror("couldn't allocate memory for sockets"); 2501 die(0); 2502 } 2503 2504 *socks = 0; /* num of sockets counter at start of array */ 2505 s = socks + 1; 2506 for (r = res; r; r = r->ai_next) { 2507 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2508 if (*s < 0) { 2509 logerror("socket"); 2510 continue; 2511 } 2512 if (r->ai_family == AF_INET6) { 2513 int on = 1; 2514 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2515 (char *)&on, sizeof (on)) < 0) { 2516 logerror("setsockopt"); 2517 close(*s); 2518 continue; 2519 } 2520 } 2521 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2522 close(*s); 2523 logerror("bind"); 2524 continue; 2525 } 2526 2527 (*socks)++; 2528 s++; 2529 } 2530 2531 if (*socks == 0) { 2532 free(socks); 2533 if (Debug) 2534 return (NULL); 2535 else 2536 die(0); 2537 } 2538 if (res) 2539 freeaddrinfo(res); 2540 2541 return (socks); 2542 } 2543