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