1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1983, 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)syslogd.c 8.3 (Berkeley) 4/4/94 35 * $FreeBSD: src/usr.sbin/syslogd/syslogd.c,v 1.59.2.26 2003/05/20 17:13:53 gshapiro Exp $ 36 * $DragonFly: src/usr.sbin/syslogd/syslogd.c,v 1.2 2003/06/17 04:30:03 dillon Exp $ 37 */ 38 39 /* 40 * syslogd -- log system messages 41 * 42 * This program implements a system log. It takes a series of lines. 43 * Each line may have a priority, signified as "<n>" as 44 * the first characters of the line. If this is 45 * not present, a default priority is used. 46 * 47 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 48 * cause it to reread its configuration file. 49 * 50 * Defined Constants: 51 * 52 * MAXLINE -- the maximimum line length that can be handled. 53 * DEFUPRI -- the default priority for user messages 54 * DEFSPRI -- the default priority for kernel messages 55 * 56 * Author: Eric Allman 57 * extensive changes by Ralph Campbell 58 * more extensive changes by Eric Allman (again) 59 * Extension to log by program name as well as facility and priority 60 * by Peter da Silva. 61 * -u and -v by Harlan Stenn. 62 * Priority comparison code by Harlan Stenn. 63 */ 64 65 #define MAXLINE 1024 /* maximum line length */ 66 #define MAXSVLINE 120 /* maximum saved line length */ 67 #define DEFUPRI (LOG_USER|LOG_NOTICE) 68 #define DEFSPRI (LOG_KERN|LOG_CRIT) 69 #define TIMERINTVL 30 /* interval for checking flush, mark */ 70 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 71 72 #include <sys/param.h> 73 #include <sys/ioctl.h> 74 #include <sys/stat.h> 75 #include <sys/wait.h> 76 #include <sys/socket.h> 77 #include <sys/queue.h> 78 #include <sys/uio.h> 79 #include <sys/un.h> 80 #include <sys/time.h> 81 #include <sys/resource.h> 82 #include <sys/syslimits.h> 83 #include <sys/types.h> 84 85 #include <netinet/in.h> 86 #include <netdb.h> 87 #include <arpa/inet.h> 88 89 #include <ctype.h> 90 #include <err.h> 91 #include <errno.h> 92 #include <fcntl.h> 93 #include <libutil.h> 94 #include <limits.h> 95 #include <paths.h> 96 #include <signal.h> 97 #include <stdio.h> 98 #include <stdlib.h> 99 #include <string.h> 100 #include <sysexits.h> 101 #include <unistd.h> 102 #include <utmp.h> 103 104 #include "pathnames.h" 105 #include "ttymsg.h" 106 107 #define SYSLOG_NAMES 108 #include <sys/syslog.h> 109 110 #ifdef NI_WITHSCOPEID 111 static const int withscopeid = NI_WITHSCOPEID; 112 #else 113 static const int withscopeid; 114 #endif 115 116 const char *ConfFile = _PATH_LOGCONF; 117 const char *PidFile = _PATH_LOGPID; 118 const char ctty[] = _PATH_CONSOLE; 119 120 #define dprintf if (Debug) printf 121 122 #define MAXUNAMES 20 /* maximum number of user names */ 123 124 #define MAXFUNIX 20 125 126 int nfunix = 1; 127 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 128 int funix[MAXFUNIX]; 129 130 /* 131 * Flags to logmsg(). 132 */ 133 134 #define IGN_CONS 0x001 /* don't print on console */ 135 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 136 #define ADDDATE 0x004 /* add a date to the message */ 137 #define MARK 0x008 /* this message is a mark */ 138 #define ISKERNEL 0x010 /* kernel generated message */ 139 140 /* 141 * This structure represents the files that will have log 142 * copies printed. 143 */ 144 145 struct filed { 146 struct filed *f_next; /* next in linked list */ 147 short f_type; /* entry type, see below */ 148 short f_file; /* file descriptor */ 149 time_t f_time; /* time this was last written */ 150 char *f_host; /* host from which to recd. */ 151 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 152 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 153 #define PRI_LT 0x1 154 #define PRI_EQ 0x2 155 #define PRI_GT 0x4 156 char *f_program; /* program this applies to */ 157 union { 158 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 159 struct { 160 char f_hname[MAXHOSTNAMELEN]; 161 struct addrinfo *f_addr; 162 163 } f_forw; /* forwarding address */ 164 char f_fname[MAXPATHLEN]; 165 struct { 166 char f_pname[MAXPATHLEN]; 167 pid_t f_pid; 168 } f_pipe; 169 } f_un; 170 char f_prevline[MAXSVLINE]; /* last message logged */ 171 char f_lasttime[16]; /* time of last occurrence */ 172 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 173 int f_prevpri; /* pri of f_prevline */ 174 int f_prevlen; /* length of f_prevline */ 175 int f_prevcount; /* repetition cnt of prevline */ 176 u_int f_repeatcount; /* number of "repeated" msgs */ 177 }; 178 179 /* 180 * Queue of about-to-be dead processes we should watch out for. 181 */ 182 183 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 184 struct stailhead *deadq_headp; 185 186 struct deadq_entry { 187 pid_t dq_pid; 188 int dq_timeout; 189 TAILQ_ENTRY(deadq_entry) dq_entries; 190 }; 191 192 /* 193 * The timeout to apply to processes waiting on the dead queue. Unit 194 * of measure is `mark intervals', i.e. 20 minutes by default. 195 * Processes on the dead queue will be terminated after that time. 196 */ 197 198 #define DQ_TIMO_INIT 2 199 200 typedef struct deadq_entry *dq_t; 201 202 203 /* 204 * Struct to hold records of network addresses that are allowed to log 205 * to us. 206 */ 207 struct allowedpeer { 208 int isnumeric; 209 u_short port; 210 union { 211 struct { 212 struct sockaddr_storage addr; 213 struct sockaddr_storage mask; 214 } numeric; 215 char *name; 216 } u; 217 #define a_addr u.numeric.addr 218 #define a_mask u.numeric.mask 219 #define a_name u.name 220 }; 221 222 223 /* 224 * Intervals at which we flush out "message repeated" messages, 225 * in seconds after previous message is logged. After each flush, 226 * we move to the next interval until we reach the largest. 227 */ 228 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 229 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 230 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 231 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 232 (f)->f_repeatcount = MAXREPEAT; \ 233 } 234 235 /* values for f_type */ 236 #define F_UNUSED 0 /* unused entry */ 237 #define F_FILE 1 /* regular file */ 238 #define F_TTY 2 /* terminal */ 239 #define F_CONSOLE 3 /* console terminal */ 240 #define F_FORW 4 /* remote machine */ 241 #define F_USERS 5 /* list of users */ 242 #define F_WALL 6 /* everyone logged on */ 243 #define F_PIPE 7 /* pipe to program */ 244 245 const char *TypeNames[8] = { 246 "UNUSED", "FILE", "TTY", "CONSOLE", 247 "FORW", "USERS", "WALL", "PIPE" 248 }; 249 250 static struct filed *Files; /* Log files that we write to */ 251 static struct filed consfile; /* Console */ 252 253 static int Debug; /* debug flag */ 254 static int resolve = 1; /* resolve hostname */ 255 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 256 static char *LocalDomain; /* our local domain name */ 257 static int *finet; /* Internet datagram socket */ 258 static int fklog = -1; /* /dev/klog */ 259 static int Initialized; /* set when we have initialized ourselves */ 260 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 261 static int MarkSeq; /* mark sequence number */ 262 static int SecureMode; /* when true, receive only unix domain socks */ 263 #ifdef INET6 264 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 265 #else 266 static int family = PF_INET; /* protocol family (IPv4 only) */ 267 #endif 268 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 269 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 270 271 static char bootfile[MAXLINE+1]; /* booted kernel file */ 272 273 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 274 static int NumAllowed; /* Number of entries in AllowedPeers */ 275 276 static int UniquePriority; /* Only log specified priority? */ 277 static int LogFacPri; /* Put facility and priority in log message: */ 278 /* 0=no, 1=numeric, 2=names */ 279 static int KeepKernFac; /* Keep remotely logged kernel facility */ 280 281 volatile sig_atomic_t MarkSet, WantDie; 282 283 static int allowaddr(char *); 284 static void cfline(const char *, struct filed *, 285 const char *, const char *); 286 static const char *cvthname(struct sockaddr *); 287 static void deadq_enter(pid_t, const char *); 288 static int deadq_remove(pid_t); 289 static int decode(const char *, CODE *); 290 static void die(int); 291 static void dodie(int); 292 static void domark(int); 293 static void fprintlog(struct filed *, int, const char *); 294 static int *socksetup(int, const char *); 295 static void init(int); 296 static void logerror(const char *); 297 static void logmsg(int, const char *, const char *, int); 298 static void log_deadchild(pid_t, int, const char *); 299 static void markit(void); 300 static void printline(const char *, char *); 301 static void printsys(char *); 302 static int p_open(const char *, pid_t *); 303 static void readklog(void); 304 static void reapchild(int); 305 static void usage(void); 306 static int validate(struct sockaddr *, const char *); 307 static void unmapped(struct sockaddr *); 308 static void wallmsg(struct filed *, struct iovec *); 309 static int waitdaemon(int, int, int); 310 static void timedout(int); 311 312 int 313 main(int argc, char *argv[]) 314 { 315 int ch, i, fdsrmax = 0, l; 316 struct sockaddr_un sunx, fromunix; 317 struct sockaddr_storage frominet; 318 fd_set *fdsr = NULL; 319 FILE *fp; 320 char line[MAXLINE + 1]; 321 const char *bindhostname, *hname; 322 struct timeval tv, *tvp; 323 struct sigaction sact; 324 sigset_t mask; 325 pid_t ppid = 1; 326 socklen_t len; 327 328 bindhostname = NULL; 329 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:np:P:suv")) != -1) 330 switch (ch) { 331 case '4': 332 family = PF_INET; 333 break; 334 #ifdef INET6 335 case '6': 336 family = PF_INET6; 337 break; 338 #endif 339 case 'A': 340 send_to_all++; 341 break; 342 case 'a': /* allow specific network addresses only */ 343 if (allowaddr(optarg) == -1) 344 usage(); 345 break; 346 case 'b': 347 bindhostname = optarg; 348 break; 349 case 'c': 350 no_compress++; 351 break; 352 case 'd': /* debug */ 353 Debug++; 354 break; 355 case 'f': /* configuration file */ 356 ConfFile = optarg; 357 break; 358 case 'k': /* keep remote kern fac */ 359 KeepKernFac = 1; 360 break; 361 case 'l': 362 if (nfunix < MAXFUNIX) 363 funixn[nfunix++] = optarg; 364 else 365 warnx("out of descriptors, ignoring %s", 366 optarg); 367 break; 368 case 'm': /* mark interval */ 369 MarkInterval = atoi(optarg) * 60; 370 break; 371 case 'n': 372 resolve = 0; 373 break; 374 case 'p': /* path */ 375 funixn[0] = optarg; 376 break; 377 case 'P': /* path for alt. PID */ 378 PidFile = optarg; 379 break; 380 case 's': /* no network mode */ 381 SecureMode++; 382 break; 383 case 'u': /* only log specified priority */ 384 UniquePriority++; 385 break; 386 case 'v': /* log facility and priority */ 387 LogFacPri++; 388 break; 389 case '?': 390 default: 391 usage(); 392 } 393 if ((argc -= optind) != 0) 394 usage(); 395 396 if (!Debug) { 397 ppid = waitdaemon(0, 0, 30); 398 if (ppid < 0) 399 err(1, "could not become daemon"); 400 } else { 401 setlinebuf(stdout); 402 } 403 404 if (NumAllowed) 405 endservent(); 406 407 consfile.f_type = F_CONSOLE; 408 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 409 sizeof(consfile.f_un.f_fname)); 410 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 411 (void)signal(SIGTERM, dodie); 412 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 413 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 414 /* 415 * We don't want the SIGCHLD and SIGHUP handlers to interfere 416 * with each other; they are likely candidates for being called 417 * simultaneously (SIGHUP closes pipe descriptor, process dies, 418 * SIGCHLD happens). 419 */ 420 sigemptyset(&mask); 421 sigaddset(&mask, SIGHUP); 422 sact.sa_handler = reapchild; 423 sact.sa_mask = mask; 424 sact.sa_flags = SA_RESTART; 425 (void)sigaction(SIGCHLD, &sact, NULL); 426 (void)signal(SIGALRM, domark); 427 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 428 (void)alarm(TIMERINTVL); 429 430 TAILQ_INIT(&deadq_head); 431 432 #ifndef SUN_LEN 433 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 434 #endif 435 for (i = 0; i < nfunix; i++) { 436 (void)unlink(funixn[i]); 437 memset(&sunx, 0, sizeof(sunx)); 438 sunx.sun_family = AF_UNIX; 439 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 440 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 441 if (funix[i] < 0 || 442 bind(funix[i], (struct sockaddr *)&sunx, 443 SUN_LEN(&sunx)) < 0 || 444 chmod(funixn[i], 0666) < 0) { 445 (void)snprintf(line, sizeof line, 446 "cannot create %s", funixn[i]); 447 logerror(line); 448 dprintf("cannot create %s (%d)\n", funixn[i], errno); 449 if (i == 0) 450 die(0); 451 } 452 } 453 if (SecureMode <= 1) 454 finet = socksetup(family, bindhostname); 455 456 if (finet) { 457 if (SecureMode) { 458 for (i = 0; i < *finet; i++) { 459 if (shutdown(finet[i+1], SHUT_RD) < 0) { 460 logerror("shutdown"); 461 if (!Debug) 462 die(0); 463 } 464 } 465 } else { 466 dprintf("listening on inet and/or inet6 socket\n"); 467 } 468 dprintf("sending on inet and/or inet6 socket\n"); 469 } 470 471 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 472 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 473 fklog = -1; 474 if (fklog < 0) 475 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 476 477 /* tuck my process id away */ 478 fp = fopen(PidFile, "w"); 479 if (fp != NULL) { 480 fprintf(fp, "%d\n", getpid()); 481 (void)fclose(fp); 482 } 483 484 dprintf("off & running....\n"); 485 486 init(0); 487 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 488 sigemptyset(&mask); 489 sigaddset(&mask, SIGCHLD); 490 sact.sa_handler = init; 491 sact.sa_mask = mask; 492 sact.sa_flags = SA_RESTART; 493 (void)sigaction(SIGHUP, &sact, NULL); 494 495 tvp = &tv; 496 tv.tv_sec = tv.tv_usec = 0; 497 498 if (fklog != -1 && fklog > fdsrmax) 499 fdsrmax = fklog; 500 if (finet && !SecureMode) { 501 for (i = 0; i < *finet; i++) { 502 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 503 fdsrmax = finet[i+1]; 504 } 505 } 506 for (i = 0; i < nfunix; i++) { 507 if (funix[i] != -1 && funix[i] > fdsrmax) 508 fdsrmax = funix[i]; 509 } 510 511 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 512 sizeof(fd_mask)); 513 if (fdsr == NULL) 514 errx(1, "calloc fd_set"); 515 516 for (;;) { 517 if (MarkSet) 518 markit(); 519 if (WantDie) 520 die(WantDie); 521 522 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 523 sizeof(fd_mask)); 524 525 if (fklog != -1) 526 FD_SET(fklog, fdsr); 527 if (finet && !SecureMode) { 528 for (i = 0; i < *finet; i++) { 529 if (finet[i+1] != -1) 530 FD_SET(finet[i+1], fdsr); 531 } 532 } 533 for (i = 0; i < nfunix; i++) { 534 if (funix[i] != -1) 535 FD_SET(funix[i], fdsr); 536 } 537 538 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 539 switch (i) { 540 case 0: 541 if (tvp) { 542 tvp = NULL; 543 if (ppid != 1) 544 kill(ppid, SIGALRM); 545 } 546 continue; 547 case -1: 548 if (errno != EINTR) 549 logerror("select"); 550 continue; 551 } 552 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 553 readklog(); 554 if (finet && !SecureMode) { 555 for (i = 0; i < *finet; i++) { 556 if (FD_ISSET(finet[i+1], fdsr)) { 557 len = sizeof(frominet); 558 l = recvfrom(finet[i+1], line, MAXLINE, 559 0, (struct sockaddr *)&frominet, 560 &len); 561 if (l > 0) { 562 line[l] = '\0'; 563 hname = cvthname((struct sockaddr *)&frominet); 564 unmapped((struct sockaddr *)&frominet); 565 if (validate((struct sockaddr *)&frominet, hname)) 566 printline(hname, line); 567 } else if (l < 0 && errno != EINTR) 568 logerror("recvfrom inet"); 569 } 570 } 571 } 572 for (i = 0; i < nfunix; i++) { 573 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 574 len = sizeof(fromunix); 575 l = recvfrom(funix[i], line, MAXLINE, 0, 576 (struct sockaddr *)&fromunix, &len); 577 if (l > 0) { 578 line[l] = '\0'; 579 printline(LocalHostName, line); 580 } else if (l < 0 && errno != EINTR) 581 logerror("recvfrom unix"); 582 } 583 } 584 } 585 if (fdsr) 586 free(fdsr); 587 } 588 589 static void 590 unmapped(struct sockaddr *sa) 591 { 592 struct sockaddr_in6 *sin6; 593 struct sockaddr_in sin4; 594 595 if (sa->sa_family != AF_INET6) 596 return; 597 if (sa->sa_len != sizeof(struct sockaddr_in6) || 598 sizeof(sin4) > sa->sa_len) 599 return; 600 sin6 = (struct sockaddr_in6 *)sa; 601 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 602 return; 603 604 memset(&sin4, 0, sizeof(sin4)); 605 sin4.sin_family = AF_INET; 606 sin4.sin_len = sizeof(struct sockaddr_in); 607 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 608 sizeof(sin4.sin_addr)); 609 sin4.sin_port = sin6->sin6_port; 610 611 memcpy(sa, &sin4, sin4.sin_len); 612 } 613 614 static void 615 usage(void) 616 { 617 618 fprintf(stderr, "%s\n%s\n%s\n%s\n", 619 "usage: syslogd [-46Acdknsuv] [-a allowed_peer]", 620 " [-b bind address] [-f config_file]", 621 " [-l log_socket] [-m mark_interval]", 622 " [-P pid_file] [-p log_socket]"); 623 exit(1); 624 } 625 626 /* 627 * Take a raw input line, decode the message, and print the message 628 * on the appropriate log files. 629 */ 630 static void 631 printline(const char *hname, char *msg) 632 { 633 int c, pri; 634 char *p, *q, line[MAXLINE + 1]; 635 636 /* test for special codes */ 637 pri = DEFUPRI; 638 p = msg; 639 if (*p == '<') { 640 pri = 0; 641 while (isdigit(*++p)) 642 pri = 10 * pri + (*p - '0'); 643 if (*p == '>') 644 ++p; 645 } 646 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 647 pri = DEFUPRI; 648 649 /* don't allow users to log kernel messages */ 650 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 651 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 652 653 q = line; 654 655 while ((c = (unsigned char)*p++) != '\0' && 656 q < &line[sizeof(line) - 4]) { 657 if ((c & 0x80) && c < 0xA0) { 658 c &= 0x7F; 659 *q++ = 'M'; 660 *q++ = '-'; 661 } 662 if (isascii(c) && iscntrl(c)) { 663 if (c == '\n') { 664 *q++ = ' '; 665 } else if (c == '\t') { 666 *q++ = '\t'; 667 } else { 668 *q++ = '^'; 669 *q++ = c ^ 0100; 670 } 671 } else { 672 *q++ = c; 673 } 674 } 675 *q = '\0'; 676 677 logmsg(pri, line, hname, 0); 678 } 679 680 /* 681 * Read /dev/klog while data are available, split into lines. 682 */ 683 static void 684 readklog(void) 685 { 686 char *p, *q, line[MAXLINE + 1]; 687 int len, i; 688 689 len = 0; 690 for (;;) { 691 i = read(fklog, line + len, MAXLINE - 1 - len); 692 if (i > 0) { 693 line[i + len] = '\0'; 694 } else { 695 if (i < 0 && errno != EINTR && errno != EAGAIN) { 696 logerror("klog"); 697 fklog = -1; 698 } 699 break; 700 } 701 702 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 703 *q = '\0'; 704 printsys(p); 705 } 706 len = strlen(p); 707 if (len >= MAXLINE - 1) { 708 printsys(p); 709 len = 0; 710 } 711 if (len > 0) 712 memmove(line, p, len + 1); 713 } 714 if (len > 0) 715 printsys(line); 716 } 717 718 /* 719 * Take a raw input line from /dev/klog, format similar to syslog(). 720 */ 721 static void 722 printsys(char *p) 723 { 724 int pri, flags; 725 726 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 727 pri = DEFSPRI; 728 if (*p == '<') { 729 pri = 0; 730 while (isdigit(*++p)) 731 pri = 10 * pri + (*p - '0'); 732 if (*p == '>') 733 ++p; 734 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 735 flags |= IGN_CONS; 736 } else { 737 /* kernel printf's come out on console */ 738 flags |= IGN_CONS; 739 } 740 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 741 pri = DEFSPRI; 742 logmsg(pri, p, LocalHostName, flags); 743 } 744 745 static time_t now; 746 747 /* 748 * Log a message to the appropriate log files, users, etc. based on 749 * the priority. 750 */ 751 static void 752 logmsg(int pri, const char *msg, const char *from, int flags) 753 { 754 struct filed *f; 755 int i, fac, msglen, omask, prilev; 756 const char *timestamp; 757 char prog[NAME_MAX+1]; 758 char buf[MAXLINE+1]; 759 760 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 761 pri, flags, from, msg); 762 763 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 764 765 /* 766 * Check to see if msg looks non-standard. 767 */ 768 msglen = strlen(msg); 769 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 770 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 771 flags |= ADDDATE; 772 773 (void)time(&now); 774 if (flags & ADDDATE) { 775 timestamp = ctime(&now) + 4; 776 } else { 777 timestamp = msg; 778 msg += 16; 779 msglen -= 16; 780 } 781 782 /* skip leading blanks */ 783 while (isspace(*msg)) { 784 msg++; 785 msglen--; 786 } 787 788 /* extract facility and priority level */ 789 if (flags & MARK) 790 fac = LOG_NFACILITIES; 791 else 792 fac = LOG_FAC(pri); 793 prilev = LOG_PRI(pri); 794 795 /* extract program name */ 796 for (i = 0; i < NAME_MAX; i++) { 797 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[') 798 break; 799 prog[i] = msg[i]; 800 } 801 prog[i] = 0; 802 803 /* add kernel prefix for kernel messages */ 804 if (flags & ISKERNEL) { 805 snprintf(buf, sizeof(buf), "%s: %s", bootfile, msg); 806 msg = buf; 807 msglen = strlen(buf); 808 } 809 810 /* log the message to the particular outputs */ 811 if (!Initialized) { 812 f = &consfile; 813 f->f_file = open(ctty, O_WRONLY, 0); 814 815 if (f->f_file >= 0) { 816 (void)strlcpy(f->f_lasttime, timestamp, 817 sizeof(f->f_lasttime)); 818 fprintlog(f, flags, msg); 819 (void)close(f->f_file); 820 } 821 (void)sigsetmask(omask); 822 return; 823 } 824 for (f = Files; f; f = f->f_next) { 825 /* skip messages that are incorrect priority */ 826 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 827 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 828 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 829 ) 830 || f->f_pmask[fac] == INTERNAL_NOPRI) 831 continue; 832 833 /* skip messages with the incorrect hostname */ 834 if (f->f_host) 835 switch (f->f_host[0]) { 836 case '+': 837 if (strcasecmp(from, f->f_host + 1) != 0) 838 continue; 839 break; 840 case '-': 841 if (strcasecmp(from, f->f_host + 1) == 0) 842 continue; 843 break; 844 } 845 846 /* skip messages with the incorrect program name */ 847 if (f->f_program) 848 switch (f->f_program[0]) { 849 case '+': 850 if (strcmp(prog, f->f_program + 1) != 0) 851 continue; 852 break; 853 case '-': 854 if (strcmp(prog, f->f_program + 1) == 0) 855 continue; 856 break; 857 default: 858 if (strcmp(prog, f->f_program) != 0) 859 continue; 860 break; 861 } 862 863 /* skip message to console if it has already been printed */ 864 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 865 continue; 866 867 /* don't output marks to recently written files */ 868 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 869 continue; 870 871 /* 872 * suppress duplicate lines to this file 873 */ 874 if (no_compress - (f->f_type != F_PIPE) < 1 && 875 (flags & MARK) == 0 && msglen == f->f_prevlen && 876 !strcmp(msg, f->f_prevline) && 877 !strcasecmp(from, f->f_prevhost)) { 878 (void)strlcpy(f->f_lasttime, timestamp, 879 sizeof(f->f_lasttime)); 880 f->f_prevcount++; 881 dprintf("msg repeated %d times, %ld sec of %d\n", 882 f->f_prevcount, (long)(now - f->f_time), 883 repeatinterval[f->f_repeatcount]); 884 /* 885 * If domark would have logged this by now, 886 * flush it now (so we don't hold isolated messages), 887 * but back off so we'll flush less often 888 * in the future. 889 */ 890 if (now > REPEATTIME(f)) { 891 fprintlog(f, flags, (char *)NULL); 892 BACKOFF(f); 893 } 894 } else { 895 /* new line, save it */ 896 if (f->f_prevcount) 897 fprintlog(f, 0, (char *)NULL); 898 f->f_repeatcount = 0; 899 f->f_prevpri = pri; 900 (void)strlcpy(f->f_lasttime, timestamp, 901 sizeof(f->f_lasttime)); 902 (void)strlcpy(f->f_prevhost, from, 903 sizeof(f->f_prevhost)); 904 if (msglen < MAXSVLINE) { 905 f->f_prevlen = msglen; 906 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 907 fprintlog(f, flags, (char *)NULL); 908 } else { 909 f->f_prevline[0] = 0; 910 f->f_prevlen = 0; 911 fprintlog(f, flags, msg); 912 } 913 } 914 } 915 (void)sigsetmask(omask); 916 } 917 918 static void 919 fprintlog(struct filed *f, int flags, const char *msg) 920 { 921 struct iovec iov[7]; 922 struct iovec *v; 923 struct addrinfo *r; 924 int i, l, lsent = 0; 925 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 926 const char *msgret; 927 928 v = iov; 929 if (f->f_type == F_WALL) { 930 v->iov_base = greetings; 931 v->iov_len = snprintf(greetings, sizeof greetings, 932 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 933 f->f_prevhost, ctime(&now)); 934 if (v->iov_len > 0) 935 v++; 936 v->iov_base = ""; 937 v->iov_len = 0; 938 v++; 939 } else { 940 v->iov_base = f->f_lasttime; 941 v->iov_len = 15; 942 v++; 943 v->iov_base = " "; 944 v->iov_len = 1; 945 v++; 946 } 947 948 if (LogFacPri) { 949 static char fp_buf[30]; /* Hollow laugh */ 950 int fac = f->f_prevpri & LOG_FACMASK; 951 int pri = LOG_PRI(f->f_prevpri); 952 const char *f_s = NULL; 953 char f_n[5]; /* Hollow laugh */ 954 const char *p_s = NULL; 955 char p_n[5]; /* Hollow laugh */ 956 957 if (LogFacPri > 1) { 958 CODE *c; 959 960 for (c = facilitynames; c->c_name; c++) { 961 if (c->c_val == fac) { 962 f_s = c->c_name; 963 break; 964 } 965 } 966 for (c = prioritynames; c->c_name; c++) { 967 if (c->c_val == pri) { 968 p_s = c->c_name; 969 break; 970 } 971 } 972 } 973 if (!f_s) { 974 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 975 f_s = f_n; 976 } 977 if (!p_s) { 978 snprintf(p_n, sizeof p_n, "%d", pri); 979 p_s = p_n; 980 } 981 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 982 v->iov_base = fp_buf; 983 v->iov_len = strlen(fp_buf); 984 } else { 985 v->iov_base=""; 986 v->iov_len = 0; 987 } 988 v++; 989 990 v->iov_base = f->f_prevhost; 991 v->iov_len = strlen(v->iov_base); 992 v++; 993 v->iov_base = " "; 994 v->iov_len = 1; 995 v++; 996 997 if (msg) { 998 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 999 if (wmsg == NULL) { 1000 logerror("strdup"); 1001 exit(1); 1002 } 1003 v->iov_base = wmsg; 1004 v->iov_len = strlen(msg); 1005 } else if (f->f_prevcount > 1) { 1006 v->iov_base = repbuf; 1007 v->iov_len = snprintf(repbuf, sizeof repbuf, 1008 "last message repeated %d times", f->f_prevcount); 1009 } else { 1010 v->iov_base = f->f_prevline; 1011 v->iov_len = f->f_prevlen; 1012 } 1013 v++; 1014 1015 dprintf("Logging to %s", TypeNames[f->f_type]); 1016 f->f_time = now; 1017 1018 switch (f->f_type) { 1019 case F_UNUSED: 1020 dprintf("\n"); 1021 break; 1022 1023 case F_FORW: 1024 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1025 /* check for local vs remote messages */ 1026 if (strcasecmp(f->f_prevhost, LocalHostName)) 1027 l = snprintf(line, sizeof line - 1, 1028 "<%d>%.15s Forwarded from %s: %s", 1029 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1030 iov[5].iov_base); 1031 else 1032 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1033 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1034 if (l < 0) 1035 l = 0; 1036 else if (l > MAXLINE) 1037 l = MAXLINE; 1038 1039 if (finet) { 1040 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1041 for (i = 0; i < *finet; i++) { 1042 #if 0 1043 /* 1044 * should we check AF first, or just 1045 * trial and error? FWD 1046 */ 1047 if (r->ai_family == 1048 address_family_of(finet[i+1])) 1049 #endif 1050 lsent = sendto(finet[i+1], line, l, 0, 1051 r->ai_addr, r->ai_addrlen); 1052 if (lsent == l) 1053 break; 1054 } 1055 if (lsent == l && !send_to_all) 1056 break; 1057 } 1058 dprintf("lsent/l: %d/%d\n", lsent, l); 1059 if (lsent != l) { 1060 int e = errno; 1061 logerror("sendto"); 1062 errno = e; 1063 switch (errno) { 1064 case EHOSTUNREACH: 1065 case EHOSTDOWN: 1066 break; 1067 /* case EBADF: */ 1068 /* case EACCES: */ 1069 /* case ENOTSOCK: */ 1070 /* case EFAULT: */ 1071 /* case EMSGSIZE: */ 1072 /* case EAGAIN: */ 1073 /* case ENOBUFS: */ 1074 /* case ECONNREFUSED: */ 1075 default: 1076 dprintf("removing entry\n", e); 1077 (void)close(f->f_file); 1078 f->f_type = F_UNUSED; 1079 break; 1080 } 1081 } 1082 } 1083 break; 1084 1085 case F_FILE: 1086 dprintf(" %s\n", f->f_un.f_fname); 1087 v->iov_base = "\n"; 1088 v->iov_len = 1; 1089 if (writev(f->f_file, iov, 7) < 0) { 1090 int e = errno; 1091 (void)close(f->f_file); 1092 f->f_type = F_UNUSED; 1093 errno = e; 1094 logerror(f->f_un.f_fname); 1095 } else if (flags & SYNC_FILE) 1096 (void)fsync(f->f_file); 1097 break; 1098 1099 case F_PIPE: 1100 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1101 v->iov_base = "\n"; 1102 v->iov_len = 1; 1103 if (f->f_un.f_pipe.f_pid == 0) { 1104 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1105 &f->f_un.f_pipe.f_pid)) < 0) { 1106 f->f_type = F_UNUSED; 1107 logerror(f->f_un.f_pipe.f_pname); 1108 break; 1109 } 1110 } 1111 if (writev(f->f_file, iov, 7) < 0) { 1112 int e = errno; 1113 (void)close(f->f_file); 1114 if (f->f_un.f_pipe.f_pid > 0) 1115 deadq_enter(f->f_un.f_pipe.f_pid, 1116 f->f_un.f_pipe.f_pname); 1117 f->f_un.f_pipe.f_pid = 0; 1118 errno = e; 1119 logerror(f->f_un.f_pipe.f_pname); 1120 } 1121 break; 1122 1123 case F_CONSOLE: 1124 if (flags & IGN_CONS) { 1125 dprintf(" (ignored)\n"); 1126 break; 1127 } 1128 /* FALLTHROUGH */ 1129 1130 case F_TTY: 1131 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1132 v->iov_base = "\r\n"; 1133 v->iov_len = 2; 1134 1135 errno = 0; /* ttymsg() only sometimes returns an errno */ 1136 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1137 f->f_type = F_UNUSED; 1138 logerror(msgret); 1139 } 1140 break; 1141 1142 case F_USERS: 1143 case F_WALL: 1144 dprintf("\n"); 1145 v->iov_base = "\r\n"; 1146 v->iov_len = 2; 1147 wallmsg(f, iov); 1148 break; 1149 } 1150 f->f_prevcount = 0; 1151 if (msg) 1152 free(wmsg); 1153 } 1154 1155 /* 1156 * WALLMSG -- Write a message to the world at large 1157 * 1158 * Write the specified message to either the entire 1159 * world, or a list of approved users. 1160 */ 1161 static void 1162 wallmsg(struct filed *f, struct iovec *iov) 1163 { 1164 static int reenter; /* avoid calling ourselves */ 1165 FILE *uf; 1166 struct utmp ut; 1167 int i; 1168 const char *p; 1169 char line[sizeof(ut.ut_line) + 1]; 1170 1171 if (reenter++) 1172 return; 1173 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1174 logerror(_PATH_UTMP); 1175 reenter = 0; 1176 return; 1177 } 1178 /* NOSTRICT */ 1179 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1180 if (ut.ut_name[0] == '\0') 1181 continue; 1182 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1183 if (f->f_type == F_WALL) { 1184 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1185 errno = 0; /* already in msg */ 1186 logerror(p); 1187 } 1188 continue; 1189 } 1190 /* should we send the message to this user? */ 1191 for (i = 0; i < MAXUNAMES; i++) { 1192 if (!f->f_un.f_uname[i][0]) 1193 break; 1194 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1195 UT_NAMESIZE)) { 1196 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1197 != NULL) { 1198 errno = 0; /* already in msg */ 1199 logerror(p); 1200 } 1201 break; 1202 } 1203 } 1204 } 1205 (void)fclose(uf); 1206 reenter = 0; 1207 } 1208 1209 static void 1210 reapchild(int signo __unused) 1211 { 1212 int status; 1213 pid_t pid; 1214 struct filed *f; 1215 1216 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1217 if (!Initialized) 1218 /* Don't tell while we are initting. */ 1219 continue; 1220 1221 /* First, look if it's a process from the dead queue. */ 1222 if (deadq_remove(pid)) 1223 goto oncemore; 1224 1225 /* Now, look in list of active processes. */ 1226 for (f = Files; f; f = f->f_next) 1227 if (f->f_type == F_PIPE && 1228 f->f_un.f_pipe.f_pid == pid) { 1229 (void)close(f->f_file); 1230 f->f_un.f_pipe.f_pid = 0; 1231 log_deadchild(pid, status, 1232 f->f_un.f_pipe.f_pname); 1233 break; 1234 } 1235 oncemore: 1236 continue; 1237 } 1238 } 1239 1240 /* 1241 * Return a printable representation of a host address. 1242 */ 1243 static const char * 1244 cvthname(struct sockaddr *f) 1245 { 1246 int error, hl; 1247 sigset_t omask, nmask; 1248 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1249 1250 error = getnameinfo((struct sockaddr *)f, 1251 ((struct sockaddr *)f)->sa_len, 1252 ip, sizeof ip, NULL, 0, 1253 NI_NUMERICHOST | withscopeid); 1254 dprintf("cvthname(%s)\n", ip); 1255 1256 if (error) { 1257 dprintf("Malformed from address %s\n", gai_strerror(error)); 1258 return ("???"); 1259 } 1260 if (!resolve) 1261 return (ip); 1262 1263 sigemptyset(&nmask); 1264 sigaddset(&nmask, SIGHUP); 1265 sigprocmask(SIG_BLOCK, &nmask, &omask); 1266 error = getnameinfo((struct sockaddr *)f, 1267 ((struct sockaddr *)f)->sa_len, 1268 hname, sizeof hname, NULL, 0, 1269 NI_NAMEREQD | withscopeid); 1270 sigprocmask(SIG_SETMASK, &omask, NULL); 1271 if (error) { 1272 dprintf("Host name for your address (%s) unknown\n", ip); 1273 return (ip); 1274 } 1275 hl = strlen(hname); 1276 if (hl > 0 && hname[hl-1] == '.') 1277 hname[--hl] = '\0'; 1278 trimdomain(hname, hl); 1279 return (hname); 1280 } 1281 1282 static void 1283 dodie(int signo) 1284 { 1285 1286 WantDie = signo; 1287 } 1288 1289 static void 1290 domark(int signo __unused) 1291 { 1292 1293 MarkSet = 1; 1294 } 1295 1296 /* 1297 * Print syslogd errors some place. 1298 */ 1299 static void 1300 logerror(const char *type) 1301 { 1302 char buf[512]; 1303 1304 if (errno) 1305 (void)snprintf(buf, 1306 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1307 else 1308 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1309 errno = 0; 1310 dprintf("%s\n", buf); 1311 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1312 } 1313 1314 static void 1315 die(int signo) 1316 { 1317 struct filed *f; 1318 int was_initialized; 1319 char buf[100]; 1320 int i; 1321 1322 was_initialized = Initialized; 1323 Initialized = 0; /* Don't log SIGCHLDs. */ 1324 for (f = Files; f != NULL; f = f->f_next) { 1325 /* flush any pending output */ 1326 if (f->f_prevcount) 1327 fprintlog(f, 0, (char *)NULL); 1328 if (f->f_type == F_PIPE) 1329 (void)close(f->f_file); 1330 } 1331 Initialized = was_initialized; 1332 if (signo) { 1333 dprintf("syslogd: exiting on signal %d\n", signo); 1334 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1335 errno = 0; 1336 logerror(buf); 1337 } 1338 for (i = 0; i < nfunix; i++) 1339 if (funixn[i] && funix[i] != -1) 1340 (void)unlink(funixn[i]); 1341 exit(1); 1342 } 1343 1344 /* 1345 * INIT -- Initialize syslogd from configuration table 1346 */ 1347 static void 1348 init(int signo) 1349 { 1350 int i; 1351 FILE *cf; 1352 struct filed *f, *next, **nextp; 1353 char *p; 1354 char cline[LINE_MAX]; 1355 char prog[NAME_MAX+1]; 1356 char host[MAXHOSTNAMELEN]; 1357 char oldLocalHostName[MAXHOSTNAMELEN]; 1358 char hostMsg[2*MAXHOSTNAMELEN+40]; 1359 1360 dprintf("init\n"); 1361 1362 /* 1363 * Load hostname (may have changed). 1364 */ 1365 if (signo != 0) 1366 (void)strlcpy(oldLocalHostName, LocalHostName, 1367 sizeof(oldLocalHostName)); 1368 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1369 err(EX_OSERR, "gethostname() failed"); 1370 if ((p = strchr(LocalHostName, '.')) != NULL) { 1371 *p++ = '\0'; 1372 LocalDomain = p; 1373 } else { 1374 LocalDomain = ""; 1375 } 1376 1377 /* 1378 * Close all open log files. 1379 */ 1380 Initialized = 0; 1381 for (f = Files; f != NULL; f = next) { 1382 /* flush any pending output */ 1383 if (f->f_prevcount) 1384 fprintlog(f, 0, (char *)NULL); 1385 1386 switch (f->f_type) { 1387 case F_FILE: 1388 case F_FORW: 1389 case F_CONSOLE: 1390 case F_TTY: 1391 (void)close(f->f_file); 1392 break; 1393 case F_PIPE: 1394 (void)close(f->f_file); 1395 if (f->f_un.f_pipe.f_pid > 0) 1396 deadq_enter(f->f_un.f_pipe.f_pid, 1397 f->f_un.f_pipe.f_pname); 1398 f->f_un.f_pipe.f_pid = 0; 1399 break; 1400 } 1401 next = f->f_next; 1402 if (f->f_program) free(f->f_program); 1403 if (f->f_host) free(f->f_host); 1404 free((char *)f); 1405 } 1406 Files = NULL; 1407 nextp = &Files; 1408 1409 /* open the configuration file */ 1410 if ((cf = fopen(ConfFile, "r")) == NULL) { 1411 dprintf("cannot open %s\n", ConfFile); 1412 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1413 if (*nextp == NULL) { 1414 logerror("calloc"); 1415 exit(1); 1416 } 1417 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1418 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1419 if ((*nextp)->f_next == NULL) { 1420 logerror("calloc"); 1421 exit(1); 1422 } 1423 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1424 Initialized = 1; 1425 return; 1426 } 1427 1428 /* 1429 * Foreach line in the conf table, open that file. 1430 */ 1431 f = NULL; 1432 (void)strlcpy(host, "*", sizeof(host)); 1433 (void)strlcpy(prog, "*", sizeof(prog)); 1434 while (fgets(cline, sizeof(cline), cf) != NULL) { 1435 /* 1436 * check for end-of-section, comments, strip off trailing 1437 * spaces and newline character. #!prog is treated specially: 1438 * following lines apply only to that program. 1439 */ 1440 for (p = cline; isspace(*p); ++p) 1441 continue; 1442 if (*p == 0) 1443 continue; 1444 if (*p == '#') { 1445 p++; 1446 if (*p != '!' && *p != '+' && *p != '-') 1447 continue; 1448 } 1449 if (*p == '+' || *p == '-') { 1450 host[0] = *p++; 1451 while (isspace(*p)) 1452 p++; 1453 if ((!*p) || (*p == '*')) { 1454 (void)strlcpy(host, "*", sizeof(host)); 1455 continue; 1456 } 1457 if (*p == '@') 1458 p = LocalHostName; 1459 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1460 if (!isalnum(*p) && *p != '.' && *p != '-') 1461 break; 1462 host[i] = *p++; 1463 } 1464 host[i] = '\0'; 1465 continue; 1466 } 1467 if (*p == '!') { 1468 p++; 1469 while (isspace(*p)) p++; 1470 if ((!*p) || (*p == '*')) { 1471 (void)strlcpy(prog, "*", sizeof(prog)); 1472 continue; 1473 } 1474 for (i = 0; i < NAME_MAX; i++) { 1475 if (!isprint(p[i])) 1476 break; 1477 prog[i] = p[i]; 1478 } 1479 prog[i] = 0; 1480 continue; 1481 } 1482 for (p = strchr(cline, '\0'); isspace(*--p);) 1483 continue; 1484 *++p = '\0'; 1485 f = (struct filed *)calloc(1, sizeof(*f)); 1486 if (f == NULL) { 1487 logerror("calloc"); 1488 exit(1); 1489 } 1490 *nextp = f; 1491 nextp = &f->f_next; 1492 cfline(cline, f, prog, host); 1493 } 1494 1495 /* close the configuration file */ 1496 (void)fclose(cf); 1497 1498 Initialized = 1; 1499 1500 if (Debug) { 1501 for (f = Files; f; f = f->f_next) { 1502 for (i = 0; i <= LOG_NFACILITIES; i++) 1503 if (f->f_pmask[i] == INTERNAL_NOPRI) 1504 printf("X "); 1505 else 1506 printf("%d ", f->f_pmask[i]); 1507 printf("%s: ", TypeNames[f->f_type]); 1508 switch (f->f_type) { 1509 case F_FILE: 1510 printf("%s", f->f_un.f_fname); 1511 break; 1512 1513 case F_CONSOLE: 1514 case F_TTY: 1515 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1516 break; 1517 1518 case F_FORW: 1519 printf("%s", f->f_un.f_forw.f_hname); 1520 break; 1521 1522 case F_PIPE: 1523 printf("%s", f->f_un.f_pipe.f_pname); 1524 break; 1525 1526 case F_USERS: 1527 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1528 printf("%s, ", f->f_un.f_uname[i]); 1529 break; 1530 } 1531 if (f->f_program) 1532 printf(" (%s)", f->f_program); 1533 printf("\n"); 1534 } 1535 } 1536 1537 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1538 dprintf("syslogd: restarted\n"); 1539 /* 1540 * Log a change in hostname, but only on a restart. 1541 */ 1542 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1543 (void)snprintf(hostMsg, sizeof(hostMsg), 1544 "syslogd: hostname changed, \"%s\" to \"%s\"", 1545 oldLocalHostName, LocalHostName); 1546 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1547 dprintf("%s\n", hostMsg); 1548 } 1549 } 1550 1551 /* 1552 * Crack a configuration file line 1553 */ 1554 static void 1555 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1556 { 1557 struct addrinfo hints, *res; 1558 int error, i, pri; 1559 const char *p, *q; 1560 char *bp; 1561 char buf[MAXLINE], ebuf[100]; 1562 1563 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1564 1565 errno = 0; /* keep strerror() stuff out of logerror messages */ 1566 1567 /* clear out file entry */ 1568 memset(f, 0, sizeof(*f)); 1569 for (i = 0; i <= LOG_NFACILITIES; i++) 1570 f->f_pmask[i] = INTERNAL_NOPRI; 1571 1572 /* save hostname if any */ 1573 if (host && *host == '*') 1574 host = NULL; 1575 if (host) { 1576 int hl; 1577 1578 f->f_host = strdup(host); 1579 if (f->f_host == NULL) { 1580 logerror("strdup"); 1581 exit(1); 1582 } 1583 hl = strlen(f->f_host); 1584 if (hl > 0 && f->f_host[hl-1] == '.') 1585 f->f_host[--hl] = '\0'; 1586 trimdomain(f->f_host, hl); 1587 } 1588 1589 /* save program name if any */ 1590 if (prog && *prog == '*') 1591 prog = NULL; 1592 if (prog) { 1593 f->f_program = strdup(prog); 1594 if (f->f_program == NULL) { 1595 logerror("strdup"); 1596 exit(1); 1597 } 1598 } 1599 1600 /* scan through the list of selectors */ 1601 for (p = line; *p && *p != '\t' && *p != ' ';) { 1602 int pri_done; 1603 int pri_cmp; 1604 int pri_invert; 1605 1606 /* find the end of this facility name list */ 1607 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1608 continue; 1609 1610 /* get the priority comparison */ 1611 pri_cmp = 0; 1612 pri_done = 0; 1613 pri_invert = 0; 1614 if (*q == '!') { 1615 pri_invert = 1; 1616 q++; 1617 } 1618 while (!pri_done) { 1619 switch (*q) { 1620 case '<': 1621 pri_cmp |= PRI_LT; 1622 q++; 1623 break; 1624 case '=': 1625 pri_cmp |= PRI_EQ; 1626 q++; 1627 break; 1628 case '>': 1629 pri_cmp |= PRI_GT; 1630 q++; 1631 break; 1632 default: 1633 pri_done++; 1634 break; 1635 } 1636 } 1637 1638 /* collect priority name */ 1639 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1640 *bp++ = *q++; 1641 *bp = '\0'; 1642 1643 /* skip cruft */ 1644 while (strchr(",;", *q)) 1645 q++; 1646 1647 /* decode priority name */ 1648 if (*buf == '*') { 1649 pri = LOG_PRIMASK + 1; 1650 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1651 } else { 1652 pri = decode(buf, prioritynames); 1653 if (pri < 0) { 1654 (void)snprintf(ebuf, sizeof ebuf, 1655 "unknown priority name \"%s\"", buf); 1656 logerror(ebuf); 1657 return; 1658 } 1659 } 1660 if (!pri_cmp) 1661 pri_cmp = (UniquePriority) 1662 ? (PRI_EQ) 1663 : (PRI_EQ | PRI_GT) 1664 ; 1665 if (pri_invert) 1666 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1667 1668 /* scan facilities */ 1669 while (*p && !strchr("\t.; ", *p)) { 1670 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1671 *bp++ = *p++; 1672 *bp = '\0'; 1673 1674 if (*buf == '*') { 1675 for (i = 0; i < LOG_NFACILITIES; i++) { 1676 f->f_pmask[i] = pri; 1677 f->f_pcmp[i] = pri_cmp; 1678 } 1679 } else { 1680 i = decode(buf, facilitynames); 1681 if (i < 0) { 1682 (void)snprintf(ebuf, sizeof ebuf, 1683 "unknown facility name \"%s\"", 1684 buf); 1685 logerror(ebuf); 1686 return; 1687 } 1688 f->f_pmask[i >> 3] = pri; 1689 f->f_pcmp[i >> 3] = pri_cmp; 1690 } 1691 while (*p == ',' || *p == ' ') 1692 p++; 1693 } 1694 1695 p = q; 1696 } 1697 1698 /* skip to action part */ 1699 while (*p == '\t' || *p == ' ') 1700 p++; 1701 1702 switch (*p) { 1703 case '@': 1704 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1705 sizeof(f->f_un.f_forw.f_hname)); 1706 memset(&hints, 0, sizeof(hints)); 1707 hints.ai_family = family; 1708 hints.ai_socktype = SOCK_DGRAM; 1709 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1710 &res); 1711 if (error) { 1712 logerror(gai_strerror(error)); 1713 break; 1714 } 1715 f->f_un.f_forw.f_addr = res; 1716 f->f_type = F_FORW; 1717 break; 1718 1719 case '/': 1720 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1721 f->f_type = F_UNUSED; 1722 logerror(p); 1723 break; 1724 } 1725 if (isatty(f->f_file)) { 1726 if (strcmp(p, ctty) == 0) 1727 f->f_type = F_CONSOLE; 1728 else 1729 f->f_type = F_TTY; 1730 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1731 sizeof(f->f_un.f_fname)); 1732 } else { 1733 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1734 f->f_type = F_FILE; 1735 } 1736 break; 1737 1738 case '|': 1739 f->f_un.f_pipe.f_pid = 0; 1740 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1741 f->f_type = F_PIPE; 1742 break; 1743 1744 case '*': 1745 f->f_type = F_WALL; 1746 break; 1747 1748 default: 1749 for (i = 0; i < MAXUNAMES && *p; i++) { 1750 for (q = p; *q && *q != ','; ) 1751 q++; 1752 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1753 if ((q - p) > UT_NAMESIZE) 1754 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1755 else 1756 f->f_un.f_uname[i][q - p] = '\0'; 1757 while (*q == ',' || *q == ' ') 1758 q++; 1759 p = q; 1760 } 1761 f->f_type = F_USERS; 1762 break; 1763 } 1764 } 1765 1766 1767 /* 1768 * Decode a symbolic name to a numeric value 1769 */ 1770 static int 1771 decode(const char *name, CODE *codetab) 1772 { 1773 CODE *c; 1774 char *p, buf[40]; 1775 1776 if (isdigit(*name)) 1777 return (atoi(name)); 1778 1779 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1780 if (isupper(*name)) 1781 *p = tolower(*name); 1782 else 1783 *p = *name; 1784 } 1785 *p = '\0'; 1786 for (c = codetab; c->c_name; c++) 1787 if (!strcmp(buf, c->c_name)) 1788 return (c->c_val); 1789 1790 return (-1); 1791 } 1792 1793 static void 1794 markit(void) 1795 { 1796 struct filed *f; 1797 dq_t q, next; 1798 1799 now = time((time_t *)NULL); 1800 MarkSeq += TIMERINTVL; 1801 if (MarkSeq >= MarkInterval) { 1802 logmsg(LOG_INFO, "-- MARK --", 1803 LocalHostName, ADDDATE|MARK); 1804 MarkSeq = 0; 1805 } 1806 1807 for (f = Files; f; f = f->f_next) { 1808 if (f->f_prevcount && now >= REPEATTIME(f)) { 1809 dprintf("flush %s: repeated %d times, %d sec.\n", 1810 TypeNames[f->f_type], f->f_prevcount, 1811 repeatinterval[f->f_repeatcount]); 1812 fprintlog(f, 0, (char *)NULL); 1813 BACKOFF(f); 1814 } 1815 } 1816 1817 /* Walk the dead queue, and see if we should signal somebody. */ 1818 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1819 next = TAILQ_NEXT(q, dq_entries); 1820 1821 switch (q->dq_timeout) { 1822 case 0: 1823 /* Already signalled once, try harder now. */ 1824 if (kill(q->dq_pid, SIGKILL) != 0) 1825 (void)deadq_remove(q->dq_pid); 1826 break; 1827 1828 case 1: 1829 /* 1830 * Timed out on dead queue, send terminate 1831 * signal. Note that we leave the removal 1832 * from the dead queue to reapchild(), which 1833 * will also log the event (unless the process 1834 * didn't even really exist, in case we simply 1835 * drop it from the dead queue). 1836 */ 1837 if (kill(q->dq_pid, SIGTERM) != 0) 1838 (void)deadq_remove(q->dq_pid); 1839 /* FALLTHROUGH */ 1840 1841 default: 1842 q->dq_timeout--; 1843 } 1844 } 1845 MarkSet = 0; 1846 (void)alarm(TIMERINTVL); 1847 } 1848 1849 /* 1850 * fork off and become a daemon, but wait for the child to come online 1851 * before returing to the parent, or we get disk thrashing at boot etc. 1852 * Set a timer so we don't hang forever if it wedges. 1853 */ 1854 static int 1855 waitdaemon(int nochdir, int noclose, int maxwait) 1856 { 1857 int fd; 1858 int status; 1859 pid_t pid, childpid; 1860 1861 switch (childpid = fork()) { 1862 case -1: 1863 return (-1); 1864 case 0: 1865 break; 1866 default: 1867 signal(SIGALRM, timedout); 1868 alarm(maxwait); 1869 while ((pid = wait3(&status, 0, NULL)) != -1) { 1870 if (WIFEXITED(status)) 1871 errx(1, "child pid %d exited with return code %d", 1872 pid, WEXITSTATUS(status)); 1873 if (WIFSIGNALED(status)) 1874 errx(1, "child pid %d exited on signal %d%s", 1875 pid, WTERMSIG(status), 1876 WCOREDUMP(status) ? " (core dumped)" : 1877 ""); 1878 if (pid == childpid) /* it's gone... */ 1879 break; 1880 } 1881 exit(0); 1882 } 1883 1884 if (setsid() == -1) 1885 return (-1); 1886 1887 if (!nochdir) 1888 (void)chdir("/"); 1889 1890 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1891 (void)dup2(fd, STDIN_FILENO); 1892 (void)dup2(fd, STDOUT_FILENO); 1893 (void)dup2(fd, STDERR_FILENO); 1894 if (fd > 2) 1895 (void)close (fd); 1896 } 1897 return (getppid()); 1898 } 1899 1900 /* 1901 * We get a SIGALRM from the child when it's running and finished doing it's 1902 * fsync()'s or O_SYNC writes for all the boot messages. 1903 * 1904 * We also get a signal from the kernel if the timer expires, so check to 1905 * see what happened. 1906 */ 1907 static void 1908 timedout(int sig __unused) 1909 { 1910 int left; 1911 left = alarm(0); 1912 signal(SIGALRM, SIG_DFL); 1913 if (left == 0) 1914 errx(1, "timed out waiting for child"); 1915 else 1916 _exit(0); 1917 } 1918 1919 /* 1920 * Add `s' to the list of allowable peer addresses to accept messages 1921 * from. 1922 * 1923 * `s' is a string in the form: 1924 * 1925 * [*]domainname[:{servicename|portnumber|*}] 1926 * 1927 * or 1928 * 1929 * netaddr/maskbits[:{servicename|portnumber|*}] 1930 * 1931 * Returns -1 on error, 0 if the argument was valid. 1932 */ 1933 static int 1934 allowaddr(char *s) 1935 { 1936 char *cp1, *cp2; 1937 struct allowedpeer ap; 1938 struct servent *se; 1939 int masklen = -1, i; 1940 struct addrinfo hints, *res; 1941 struct in_addr *addrp, *maskp; 1942 u_int32_t *addr6p, *mask6p; 1943 char ip[NI_MAXHOST]; 1944 1945 #ifdef INET6 1946 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1947 #endif 1948 cp1 = s; 1949 if ((cp1 = strrchr(cp1, ':'))) { 1950 /* service/port provided */ 1951 *cp1++ = '\0'; 1952 if (strlen(cp1) == 1 && *cp1 == '*') 1953 /* any port allowed */ 1954 ap.port = 0; 1955 else if ((se = getservbyname(cp1, "udp"))) { 1956 ap.port = ntohs(se->s_port); 1957 } else { 1958 ap.port = strtol(cp1, &cp2, 0); 1959 if (*cp2 != '\0') 1960 return (-1); /* port not numeric */ 1961 } 1962 } else { 1963 if ((se = getservbyname("syslog", "udp"))) 1964 ap.port = ntohs(se->s_port); 1965 else 1966 /* sanity, should not happen */ 1967 ap.port = 514; 1968 } 1969 1970 if ((cp1 = strchr(s, '/')) != NULL && 1971 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 1972 *cp1 = '\0'; 1973 if ((masklen = atoi(cp1 + 1)) < 0) 1974 return (-1); 1975 } 1976 #ifdef INET6 1977 if (*s == '[') { 1978 cp2 = s + strlen(s) - 1; 1979 if (*cp2 == ']') { 1980 ++s; 1981 *cp2 = '\0'; 1982 } else { 1983 cp2 = NULL; 1984 } 1985 } else { 1986 cp2 = NULL; 1987 } 1988 #endif 1989 memset(&hints, 0, sizeof(hints)); 1990 hints.ai_family = PF_UNSPEC; 1991 hints.ai_socktype = SOCK_DGRAM; 1992 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 1993 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 1994 ap.isnumeric = 1; 1995 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 1996 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 1997 ap.a_mask.ss_family = res->ai_family; 1998 if (res->ai_family == AF_INET) { 1999 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2000 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2001 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2002 if (masklen < 0) { 2003 /* use default netmask */ 2004 if (IN_CLASSA(ntohl(addrp->s_addr))) 2005 maskp->s_addr = htonl(IN_CLASSA_NET); 2006 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2007 maskp->s_addr = htonl(IN_CLASSB_NET); 2008 else 2009 maskp->s_addr = htonl(IN_CLASSC_NET); 2010 } else if (masklen <= 32) { 2011 /* convert masklen to netmask */ 2012 if (masklen == 0) 2013 maskp->s_addr = 0; 2014 else 2015 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2016 } else { 2017 freeaddrinfo(res); 2018 return (-1); 2019 } 2020 /* Lose any host bits in the network number. */ 2021 addrp->s_addr &= maskp->s_addr; 2022 } 2023 #ifdef INET6 2024 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2025 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2026 if (masklen < 0) 2027 masklen = 128; 2028 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2029 /* convert masklen to netmask */ 2030 while (masklen > 0) { 2031 if (masklen < 32) { 2032 *mask6p = htonl(~(0xffffffff >> masklen)); 2033 break; 2034 } 2035 *mask6p++ = 0xffffffff; 2036 masklen -= 32; 2037 } 2038 /* Lose any host bits in the network number. */ 2039 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2040 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2041 for (i = 0; i < 4; i++) 2042 addr6p[i] &= mask6p[i]; 2043 } 2044 #endif 2045 else { 2046 freeaddrinfo(res); 2047 return (-1); 2048 } 2049 freeaddrinfo(res); 2050 } else { 2051 /* arg `s' is domain name */ 2052 ap.isnumeric = 0; 2053 ap.a_name = s; 2054 if (cp1) 2055 *cp1 = '/'; 2056 #ifdef INET6 2057 if (cp2) { 2058 *cp2 = ']'; 2059 --s; 2060 } 2061 #endif 2062 } 2063 2064 if (Debug) { 2065 printf("allowaddr: rule %d: ", NumAllowed); 2066 if (ap.isnumeric) { 2067 printf("numeric, "); 2068 getnameinfo((struct sockaddr *)&ap.a_addr, 2069 ((struct sockaddr *)&ap.a_addr)->sa_len, 2070 ip, sizeof ip, NULL, 0, 2071 NI_NUMERICHOST | withscopeid); 2072 printf("addr = %s, ", ip); 2073 getnameinfo((struct sockaddr *)&ap.a_mask, 2074 ((struct sockaddr *)&ap.a_mask)->sa_len, 2075 ip, sizeof ip, NULL, 0, 2076 NI_NUMERICHOST | withscopeid); 2077 printf("mask = %s; ", ip); 2078 } else { 2079 printf("domainname = %s; ", ap.a_name); 2080 } 2081 printf("port = %d\n", ap.port); 2082 } 2083 2084 if ((AllowedPeers = realloc(AllowedPeers, 2085 ++NumAllowed * sizeof(struct allowedpeer))) 2086 == NULL) { 2087 logerror("realloc"); 2088 exit(1); 2089 } 2090 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2091 return (0); 2092 } 2093 2094 /* 2095 * Validate that the remote peer has permission to log to us. 2096 */ 2097 static int 2098 validate(struct sockaddr *sa, const char *hname) 2099 { 2100 int i, j, reject; 2101 size_t l1, l2; 2102 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2103 struct allowedpeer *ap; 2104 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2105 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2106 struct addrinfo hints, *res; 2107 u_short sport; 2108 2109 if (NumAllowed == 0) 2110 /* traditional behaviour, allow everything */ 2111 return (1); 2112 2113 (void)strlcpy(name, hname, sizeof(name)); 2114 memset(&hints, 0, sizeof(hints)); 2115 hints.ai_family = PF_UNSPEC; 2116 hints.ai_socktype = SOCK_DGRAM; 2117 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2118 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2119 freeaddrinfo(res); 2120 else if (strchr(name, '.') == NULL) { 2121 strlcat(name, ".", sizeof name); 2122 strlcat(name, LocalDomain, sizeof name); 2123 } 2124 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2125 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2126 return (0); /* for safety, should not occur */ 2127 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2128 ip, port, name); 2129 sport = atoi(port); 2130 2131 /* now, walk down the list */ 2132 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2133 if (ap->port != 0 && ap->port != sport) { 2134 dprintf("rejected in rule %d due to port mismatch.\n", i); 2135 continue; 2136 } 2137 2138 if (ap->isnumeric) { 2139 if (ap->a_addr.ss_family != sa->sa_family) { 2140 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2141 continue; 2142 } 2143 if (ap->a_addr.ss_family == AF_INET) { 2144 sin4 = (struct sockaddr_in *)sa; 2145 a4p = (struct sockaddr_in *)&ap->a_addr; 2146 m4p = (struct sockaddr_in *)&ap->a_mask; 2147 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2148 != a4p->sin_addr.s_addr) { 2149 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2150 continue; 2151 } 2152 } 2153 #ifdef INET6 2154 else if (ap->a_addr.ss_family == AF_INET6) { 2155 sin6 = (struct sockaddr_in6 *)sa; 2156 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2157 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2158 #ifdef NI_WITHSCOPEID 2159 if (a6p->sin6_scope_id != 0 && 2160 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2161 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2162 continue; 2163 } 2164 #endif 2165 reject = 0; 2166 for (j = 0; j < 16; j += 4) { 2167 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2168 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2169 ++reject; 2170 break; 2171 } 2172 } 2173 if (reject) { 2174 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2175 continue; 2176 } 2177 } 2178 #endif 2179 else 2180 continue; 2181 } else { 2182 cp = ap->a_name; 2183 l1 = strlen(name); 2184 if (*cp == '*') { 2185 /* allow wildmatch */ 2186 cp++; 2187 l2 = strlen(cp); 2188 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2189 dprintf("rejected in rule %d due to name mismatch.\n", i); 2190 continue; 2191 } 2192 } else { 2193 /* exact match */ 2194 l2 = strlen(cp); 2195 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2196 dprintf("rejected in rule %d due to name mismatch.\n", i); 2197 continue; 2198 } 2199 } 2200 } 2201 dprintf("accepted in rule %d.\n", i); 2202 return (1); /* hooray! */ 2203 } 2204 return (0); 2205 } 2206 2207 /* 2208 * Fairly similar to popen(3), but returns an open descriptor, as 2209 * opposed to a FILE *. 2210 */ 2211 static int 2212 p_open(const char *prog, pid_t *pid) 2213 { 2214 int pfd[2], nulldesc, i; 2215 sigset_t omask, mask; 2216 char *argv[4]; /* sh -c cmd NULL */ 2217 char errmsg[200]; 2218 2219 if (pipe(pfd) == -1) 2220 return (-1); 2221 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2222 /* we are royally screwed anyway */ 2223 return (-1); 2224 2225 sigemptyset(&mask); 2226 sigaddset(&mask, SIGALRM); 2227 sigaddset(&mask, SIGHUP); 2228 sigprocmask(SIG_BLOCK, &mask, &omask); 2229 switch ((*pid = fork())) { 2230 case -1: 2231 sigprocmask(SIG_SETMASK, &omask, 0); 2232 close(nulldesc); 2233 return (-1); 2234 2235 case 0: 2236 argv[0] = strdup("sh"); 2237 argv[1] = strdup("-c"); 2238 argv[2] = strdup(prog); 2239 argv[3] = NULL; 2240 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2241 logerror("strdup"); 2242 exit(1); 2243 } 2244 2245 alarm(0); 2246 (void)setsid(); /* Avoid catching SIGHUPs. */ 2247 2248 /* 2249 * Throw away pending signals, and reset signal 2250 * behaviour to standard values. 2251 */ 2252 signal(SIGALRM, SIG_IGN); 2253 signal(SIGHUP, SIG_IGN); 2254 sigprocmask(SIG_SETMASK, &omask, 0); 2255 signal(SIGPIPE, SIG_DFL); 2256 signal(SIGQUIT, SIG_DFL); 2257 signal(SIGALRM, SIG_DFL); 2258 signal(SIGHUP, SIG_DFL); 2259 2260 dup2(pfd[0], STDIN_FILENO); 2261 dup2(nulldesc, STDOUT_FILENO); 2262 dup2(nulldesc, STDERR_FILENO); 2263 for (i = getdtablesize(); i > 2; i--) 2264 (void)close(i); 2265 2266 (void)execvp(_PATH_BSHELL, argv); 2267 _exit(255); 2268 } 2269 2270 sigprocmask(SIG_SETMASK, &omask, 0); 2271 close(nulldesc); 2272 close(pfd[0]); 2273 /* 2274 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2275 * supposed to get an EWOULDBLOCK on writev(2), which is 2276 * caught by the logic above anyway, which will in turn close 2277 * the pipe, and fork a new logging subprocess if necessary. 2278 * The stale subprocess will be killed some time later unless 2279 * it terminated itself due to closing its input pipe (so we 2280 * get rid of really dead puppies). 2281 */ 2282 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2283 /* This is bad. */ 2284 (void)snprintf(errmsg, sizeof errmsg, 2285 "Warning: cannot change pipe to PID %d to " 2286 "non-blocking behaviour.", 2287 (int)*pid); 2288 logerror(errmsg); 2289 } 2290 return (pfd[1]); 2291 } 2292 2293 static void 2294 deadq_enter(pid_t pid, const char *name) 2295 { 2296 dq_t p; 2297 int status; 2298 2299 /* 2300 * Be paranoid, if we can't signal the process, don't enter it 2301 * into the dead queue (perhaps it's already dead). If possible, 2302 * we try to fetch and log the child's status. 2303 */ 2304 if (kill(pid, 0) != 0) { 2305 if (waitpid(pid, &status, WNOHANG) > 0) 2306 log_deadchild(pid, status, name); 2307 return; 2308 } 2309 2310 p = malloc(sizeof(struct deadq_entry)); 2311 if (p == NULL) { 2312 logerror("malloc"); 2313 exit(1); 2314 } 2315 2316 p->dq_pid = pid; 2317 p->dq_timeout = DQ_TIMO_INIT; 2318 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2319 } 2320 2321 static int 2322 deadq_remove(pid_t pid) 2323 { 2324 dq_t q; 2325 2326 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2327 if (q->dq_pid == pid) { 2328 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2329 free(q); 2330 return (1); 2331 } 2332 } 2333 2334 return (0); 2335 } 2336 2337 static void 2338 log_deadchild(pid_t pid, int status, const char *name) 2339 { 2340 int code; 2341 char buf[256]; 2342 const char *reason; 2343 2344 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2345 if (WIFSIGNALED(status)) { 2346 reason = "due to signal"; 2347 code = WTERMSIG(status); 2348 } else { 2349 reason = "with status"; 2350 code = WEXITSTATUS(status); 2351 if (code == 0) 2352 return; 2353 } 2354 (void)snprintf(buf, sizeof buf, 2355 "Logging subprocess %d (%s) exited %s %d.", 2356 pid, name, reason, code); 2357 logerror(buf); 2358 } 2359 2360 static int * 2361 socksetup(int af, const char *bindhostname) 2362 { 2363 struct addrinfo hints, *res, *r; 2364 int error, maxs, *s, *socks; 2365 2366 memset(&hints, 0, sizeof(hints)); 2367 hints.ai_flags = AI_PASSIVE; 2368 hints.ai_family = af; 2369 hints.ai_socktype = SOCK_DGRAM; 2370 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2371 if (error) { 2372 logerror(gai_strerror(error)); 2373 errno = 0; 2374 die(0); 2375 } 2376 2377 /* Count max number of sockets we may open */ 2378 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2379 socks = malloc((maxs+1) * sizeof(int)); 2380 if (socks == NULL) { 2381 logerror("couldn't allocate memory for sockets"); 2382 die(0); 2383 } 2384 2385 *socks = 0; /* num of sockets counter at start of array */ 2386 s = socks + 1; 2387 for (r = res; r; r = r->ai_next) { 2388 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2389 if (*s < 0) { 2390 logerror("socket"); 2391 continue; 2392 } 2393 if (r->ai_family == AF_INET6) { 2394 int on = 1; 2395 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2396 (char *)&on, sizeof (on)) < 0) { 2397 logerror("setsockopt"); 2398 close(*s); 2399 continue; 2400 } 2401 } 2402 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2403 close(*s); 2404 logerror("bind"); 2405 continue; 2406 } 2407 2408 (*socks)++; 2409 s++; 2410 } 2411 2412 if (*socks == 0) { 2413 free(socks); 2414 if (Debug) 2415 return (NULL); 2416 else 2417 die(0); 2418 } 2419 if (res) 2420 freeaddrinfo(res); 2421 2422 return (socks); 2423 } 2424