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