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 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 /* 49 * syslogd -- log system messages 50 * 51 * This program implements a system log. It takes a series of lines. 52 * Each line may have a priority, signified as "<n>" as 53 * the first characters of the line. If this is 54 * not present, a default priority is used. 55 * 56 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 57 * cause it to reread its configuration file. 58 * 59 * Defined Constants: 60 * 61 * MAXLINE -- the maximimum line length that can be handled. 62 * DEFUPRI -- the default priority for user messages 63 * DEFSPRI -- the default priority for kernel messages 64 * 65 * Author: Eric Allman 66 * extensive changes by Ralph Campbell 67 * more extensive changes by Eric Allman (again) 68 * Extension to log by program name as well as facility and priority 69 * by Peter da Silva. 70 * -u and -v by Harlan Stenn. 71 * Priority comparison code by Harlan Stenn. 72 */ 73 74 #define MAXLINE 1024 /* maximum line length */ 75 #define MAXSVLINE 120 /* maximum saved line length */ 76 #define DEFUPRI (LOG_USER|LOG_NOTICE) 77 #define DEFSPRI (LOG_KERN|LOG_CRIT) 78 #define TIMERINTVL 30 /* interval for checking flush, mark */ 79 #define TTYMSGTIME 1 /* timed out passed to ttymsg */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/stat.h> 84 #include <sys/wait.h> 85 #include <sys/socket.h> 86 #include <sys/queue.h> 87 #include <sys/uio.h> 88 #include <sys/un.h> 89 #include <sys/time.h> 90 #include <sys/resource.h> 91 #include <sys/syslimits.h> 92 #include <paths.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 <signal.h> 103 #include <stdio.h> 104 #include <stdlib.h> 105 #include <string.h> 106 #include <sysexits.h> 107 #include <unistd.h> 108 #include <utmp.h> 109 110 #include "pathnames.h" 111 #include "ttymsg.h" 112 113 #define SYSLOG_NAMES 114 #include <sys/syslog.h> 115 116 #ifdef NI_WITHSCOPEID 117 static const int withscopeid = NI_WITHSCOPEID; 118 #else 119 static const int withscopeid = 0; 120 #endif 121 122 const char *ConfFile = _PATH_LOGCONF; 123 const char *PidFile = _PATH_LOGPID; 124 const char ctty[] = _PATH_CONSOLE; 125 126 #define dprintf if (Debug) printf 127 128 #define MAXUNAMES 20 /* maximum number of user names */ 129 130 #define MAXFUNIX 20 131 132 int nfunix = 1; 133 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 134 int funix[MAXFUNIX]; 135 136 /* 137 * Flags to logmsg(). 138 */ 139 140 #define IGN_CONS 0x001 /* don't print on console */ 141 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 142 #define ADDDATE 0x004 /* add a date to the message */ 143 #define MARK 0x008 /* this message is a mark */ 144 #define ISKERNEL 0x010 /* kernel generated message */ 145 146 /* 147 * This structure represents the files that will have log 148 * copies printed. 149 */ 150 151 struct filed { 152 struct filed *f_next; /* next in linked list */ 153 short f_type; /* entry type, see below */ 154 short f_file; /* file descriptor */ 155 time_t f_time; /* time this was last written */ 156 char *f_host; /* host from which to recd. */ 157 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 158 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 159 #define PRI_LT 0x1 160 #define PRI_EQ 0x2 161 #define PRI_GT 0x4 162 char *f_program; /* program this applies to */ 163 union { 164 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 165 struct { 166 char f_hname[MAXHOSTNAMELEN]; 167 struct addrinfo *f_addr; 168 169 } f_forw; /* forwarding address */ 170 char f_fname[MAXPATHLEN]; 171 struct { 172 char f_pname[MAXPATHLEN]; 173 pid_t f_pid; 174 } f_pipe; 175 } f_un; 176 char f_prevline[MAXSVLINE]; /* last message logged */ 177 char f_lasttime[16]; /* time of last occurrence */ 178 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 179 int f_prevpri; /* pri of f_prevline */ 180 int f_prevlen; /* length of f_prevline */ 181 int f_prevcount; /* repetition cnt of prevline */ 182 u_int f_repeatcount; /* number of "repeated" msgs */ 183 }; 184 185 /* 186 * Queue of about-to-be dead processes we should watch out for. 187 */ 188 189 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 190 struct stailhead *deadq_headp; 191 192 struct deadq_entry { 193 pid_t dq_pid; 194 int dq_timeout; 195 TAILQ_ENTRY(deadq_entry) dq_entries; 196 }; 197 198 /* 199 * The timeout to apply to processes waiting on the dead queue. Unit 200 * of measure is `mark intervals', i.e. 20 minutes by default. 201 * Processes on the dead queue will be terminated after that time. 202 */ 203 204 #define DQ_TIMO_INIT 2 205 206 typedef struct deadq_entry *dq_t; 207 208 209 /* 210 * Struct to hold records of network addresses that are allowed to log 211 * to us. 212 */ 213 struct allowedpeer { 214 int isnumeric; 215 u_short port; 216 union { 217 struct { 218 struct sockaddr_storage addr; 219 struct sockaddr_storage mask; 220 } numeric; 221 char *name; 222 } u; 223 #define a_addr u.numeric.addr 224 #define a_mask u.numeric.mask 225 #define a_name u.name 226 }; 227 228 229 /* 230 * Intervals at which we flush out "message repeated" messages, 231 * in seconds after previous message is logged. After each flush, 232 * we move to the next interval until we reach the largest. 233 */ 234 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 235 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 236 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 237 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 238 (f)->f_repeatcount = MAXREPEAT; \ 239 } 240 241 /* values for f_type */ 242 #define F_UNUSED 0 /* unused entry */ 243 #define F_FILE 1 /* regular file */ 244 #define F_TTY 2 /* terminal */ 245 #define F_CONSOLE 3 /* console terminal */ 246 #define F_FORW 4 /* remote machine */ 247 #define F_USERS 5 /* list of users */ 248 #define F_WALL 6 /* everyone logged on */ 249 #define F_PIPE 7 /* pipe to program */ 250 251 const char *TypeNames[8] = { 252 "UNUSED", "FILE", "TTY", "CONSOLE", 253 "FORW", "USERS", "WALL", "PIPE" 254 }; 255 256 struct filed *Files; 257 struct filed consfile; 258 259 int Debug; /* debug flag */ 260 int resolve = 1; /* resolve hostname */ 261 char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 262 const char *LocalDomain; /* our local domain name */ 263 int *finet = NULL; /* Internet datagram socket */ 264 int fklog = -1; /* /dev/klog */ 265 int Initialized = 0; /* set when we have initialized ourselves */ 266 int MarkInterval = 20 * 60; /* interval between marks in seconds */ 267 int MarkSeq = 0; /* mark sequence number */ 268 int SecureMode = 0; /* when true, receive only unix domain socks */ 269 #ifdef INET6 270 int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 271 #else 272 int family = PF_INET; /* protocol family (IPv4 only) */ 273 #endif 274 int send_to_all = 0; /* send message to all IPv4/IPv6 addresses */ 275 int use_bootfile = 0; /* log entire bootfile for every kern msg */ 276 int no_compress = 0; /* don't compress messages (1=pipes, 2=all) */ 277 278 char bootfile[MAXLINE+1]; /* booted kernel file */ 279 280 struct allowedpeer *AllowedPeers; 281 int NumAllowed = 0; /* # of AllowedPeer entries */ 282 283 int UniquePriority = 0; /* Only log specified priority? */ 284 int LogFacPri = 0; /* Put facility and priority in log message: */ 285 /* 0=no, 1=numeric, 2=names */ 286 int KeepKernFac = 0; /* Keep remotely logged kernel facility */ 287 288 volatile sig_atomic_t MarkSet, WantDie; 289 290 int allowaddr __P((char *)); 291 void cfline __P((const char *, struct filed *, const char *, const char *)); 292 const char *cvthname __P((struct sockaddr *)); 293 void deadq_enter __P((pid_t, const char *)); 294 int deadq_remove __P((pid_t)); 295 int decode __P((const char *, CODE *)); 296 void die __P((int)); 297 void dodie __P((int)); 298 void domark __P((int)); 299 void fprintlog __P((struct filed *, int, const char *)); 300 int* socksetup __P((int, const char *)); 301 void init __P((int)); 302 void logerror __P((const char *)); 303 void logmsg __P((int, const char *, const char *, int)); 304 void log_deadchild __P((pid_t, int, const char *)); 305 void markit __P((void)); 306 void printline __P((const char *, char *)); 307 void printsys __P((char *)); 308 int p_open __P((const char *, pid_t *)); 309 void readklog __P((void)); 310 void reapchild __P((int)); 311 static void usage __P((void)); 312 int validate __P((struct sockaddr *, const char *)); 313 static void unmapped __P((struct sockaddr *)); 314 void wallmsg __P((struct filed *, struct iovec *)); 315 int waitdaemon __P((int, int, int)); 316 void timedout __P((int)); 317 318 int 319 main(argc, argv) 320 int argc; 321 char *argv[]; 322 { 323 int ch, i, fdsrmax = 0, l; 324 struct sockaddr_un sunx, fromunix; 325 struct sockaddr_storage frominet; 326 fd_set *fdsr = NULL; 327 FILE *fp; 328 char line[MAXLINE + 1]; 329 const char *bindhostname, *hname; 330 struct timeval tv, *tvp; 331 struct sigaction sact; 332 sigset_t mask; 333 pid_t ppid = 1; 334 socklen_t len; 335 336 bindhostname = NULL; 337 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 338 switch (ch) { 339 case '4': 340 family = PF_INET; 341 break; 342 #ifdef INET6 343 case '6': 344 family = PF_INET6; 345 break; 346 #endif 347 case 'A': 348 send_to_all++; 349 break; 350 case 'a': /* allow specific network addresses only */ 351 if (allowaddr(optarg) == -1) 352 usage(); 353 break; 354 case 'b': 355 bindhostname = optarg; 356 break; 357 case 'c': 358 no_compress++; 359 break; 360 case 'd': /* debug */ 361 Debug++; 362 break; 363 case 'f': /* configuration file */ 364 ConfFile = optarg; 365 break; 366 case 'k': /* keep remote kern fac */ 367 KeepKernFac = 1; 368 break; 369 case 'l': 370 if (nfunix < MAXFUNIX) 371 funixn[nfunix++] = optarg; 372 else 373 warnx("out of descriptors, ignoring %s", 374 optarg); 375 break; 376 case 'm': /* mark interval */ 377 MarkInterval = atoi(optarg) * 60; 378 break; 379 case 'n': 380 resolve = 0; 381 break; 382 case 'o': 383 use_bootfile = 1; 384 break; 385 case 'p': /* path */ 386 funixn[0] = optarg; 387 break; 388 case 'P': /* path for alt. PID */ 389 PidFile = optarg; 390 break; 391 case 's': /* no network mode */ 392 SecureMode++; 393 break; 394 case 'u': /* only log specified priority */ 395 UniquePriority++; 396 break; 397 case 'v': /* log facility and priority */ 398 LogFacPri++; 399 break; 400 case '?': 401 default: 402 usage(); 403 } 404 if ((argc -= optind) != 0) 405 usage(); 406 407 if (!Debug) { 408 ppid = waitdaemon(0, 0, 30); 409 if (ppid < 0) 410 err(1, "could not become daemon"); 411 } else 412 setlinebuf(stdout); 413 414 if (NumAllowed) 415 endservent(); 416 417 consfile.f_type = F_CONSOLE; 418 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 419 sizeof(consfile.f_un.f_fname)); 420 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 421 (void)signal(SIGTERM, dodie); 422 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 423 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 424 /* 425 * We don't want the SIGCHLD and SIGHUP handlers to interfere 426 * with each other; they are likely candidates for being called 427 * simultaneously (SIGHUP closes pipe descriptor, process dies, 428 * SIGCHLD happens). 429 */ 430 sigemptyset(&mask); 431 sigaddset(&mask, SIGHUP); 432 sact.sa_handler = reapchild; 433 sact.sa_mask = mask; 434 sact.sa_flags = SA_RESTART; 435 (void)sigaction(SIGCHLD, &sact, NULL); 436 (void)signal(SIGALRM, domark); 437 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 438 (void)alarm(TIMERINTVL); 439 440 TAILQ_INIT(&deadq_head); 441 442 #ifndef SUN_LEN 443 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 444 #endif 445 for (i = 0; i < nfunix; i++) { 446 (void)unlink(funixn[i]); 447 memset(&sunx, 0, sizeof(sunx)); 448 sunx.sun_family = AF_UNIX; 449 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 450 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 451 if (funix[i] < 0 || 452 bind(funix[i], (struct sockaddr *)&sunx, 453 SUN_LEN(&sunx)) < 0 || 454 chmod(funixn[i], 0666) < 0) { 455 (void) snprintf(line, sizeof line, 456 "cannot create %s", funixn[i]); 457 logerror(line); 458 dprintf("cannot create %s (%d)\n", funixn[i], errno); 459 if (i == 0) 460 die(0); 461 } 462 } 463 if (SecureMode <= 1) 464 finet = socksetup(family, bindhostname); 465 466 if (finet) { 467 if (SecureMode) { 468 for (i = 0; i < *finet; i++) { 469 if (shutdown(finet[i+1], SHUT_RD) < 0) { 470 logerror("shutdown"); 471 if (!Debug) 472 die(0); 473 } 474 } 475 } else 476 dprintf("listening on inet and/or inet6 socket\n"); 477 dprintf("sending on inet and/or inet6 socket\n"); 478 } 479 480 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 481 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 482 fklog = -1; 483 if (fklog < 0) 484 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 485 486 /* tuck my process id away */ 487 fp = fopen(PidFile, "w"); 488 if (fp != NULL) { 489 fprintf(fp, "%d\n", getpid()); 490 (void) fclose(fp); 491 } 492 493 dprintf("off & running....\n"); 494 495 init(0); 496 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 497 sigemptyset(&mask); 498 sigaddset(&mask, SIGCHLD); 499 sact.sa_handler = init; 500 sact.sa_mask = mask; 501 sact.sa_flags = SA_RESTART; 502 (void)sigaction(SIGHUP, &sact, NULL); 503 504 tvp = &tv; 505 tv.tv_sec = tv.tv_usec = 0; 506 507 if (fklog != -1 && fklog > fdsrmax) 508 fdsrmax = fklog; 509 if (finet && !SecureMode) { 510 for (i = 0; i < *finet; i++) { 511 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 512 fdsrmax = finet[i+1]; 513 } 514 } 515 for (i = 0; i < nfunix; i++) { 516 if (funix[i] != -1 && funix[i] > fdsrmax) 517 fdsrmax = funix[i]; 518 } 519 520 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 521 sizeof(fd_mask)); 522 if (fdsr == NULL) 523 errx(1, "calloc fd_set"); 524 525 for (;;) { 526 if (MarkSet) 527 markit(); 528 if (WantDie) 529 die(WantDie); 530 531 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 532 sizeof(fd_mask)); 533 534 if (fklog != -1) 535 FD_SET(fklog, fdsr); 536 if (finet && !SecureMode) { 537 for (i = 0; i < *finet; i++) { 538 if (finet[i+1] != -1) 539 FD_SET(finet[i+1], fdsr); 540 } 541 } 542 for (i = 0; i < nfunix; i++) { 543 if (funix[i] != -1) 544 FD_SET(funix[i], fdsr); 545 } 546 547 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 548 switch (i) { 549 case 0: 550 if (tvp) { 551 tvp = NULL; 552 if (ppid != 1) 553 kill(ppid, SIGALRM); 554 } 555 continue; 556 case -1: 557 if (errno != EINTR) 558 logerror("select"); 559 continue; 560 } 561 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 562 readklog(); 563 if (finet && !SecureMode) { 564 for (i = 0; i < *finet; i++) { 565 if (FD_ISSET(finet[i+1], fdsr)) { 566 len = sizeof(frominet); 567 l = recvfrom(finet[i+1], line, MAXLINE, 568 0, (struct sockaddr *)&frominet, 569 &len); 570 if (l > 0) { 571 line[l] = '\0'; 572 hname = cvthname((struct sockaddr *)&frominet); 573 unmapped((struct sockaddr *)&frominet); 574 if (validate((struct sockaddr *)&frominet, hname)) 575 printline(hname, line); 576 } else if (l < 0 && errno != EINTR) 577 logerror("recvfrom inet"); 578 } 579 } 580 } 581 for (i = 0; i < nfunix; i++) { 582 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 583 len = sizeof(fromunix); 584 l = recvfrom(funix[i], line, MAXLINE, 0, 585 (struct sockaddr *)&fromunix, &len); 586 if (l > 0) { 587 line[l] = '\0'; 588 printline(LocalHostName, line); 589 } else if (l < 0 && errno != EINTR) 590 logerror("recvfrom unix"); 591 } 592 } 593 } 594 if (fdsr) 595 free(fdsr); 596 } 597 598 static void 599 unmapped(sa) 600 struct sockaddr *sa; 601 { 602 struct sockaddr_in6 *sin6; 603 struct sockaddr_in sin4; 604 605 if (sa->sa_family != AF_INET6) 606 return; 607 if (sa->sa_len != sizeof(struct sockaddr_in6) || 608 sizeof(sin4) > sa->sa_len) 609 return; 610 sin6 = (struct sockaddr_in6 *)sa; 611 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 612 return; 613 614 memset(&sin4, 0, sizeof(sin4)); 615 sin4.sin_family = AF_INET; 616 sin4.sin_len = sizeof(struct sockaddr_in); 617 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 618 sizeof(sin4.sin_addr)); 619 sin4.sin_port = sin6->sin6_port; 620 621 memcpy(sa, &sin4, sin4.sin_len); 622 } 623 624 static void 625 usage() 626 { 627 628 fprintf(stderr, "%s\n%s\n%s\n", 629 "usage: syslogd [-46Adnsuv] [-a allowed_peer] [-f config_file]", 630 " [-m mark_interval] [-l log_socket]", 631 " [-p log_socket] [-P pid_file]"); 632 exit(1); 633 } 634 635 /* 636 * Take a raw input line, decode the message, and print the message 637 * on the appropriate log files. 638 */ 639 void 640 printline(hname, msg) 641 const char *hname; 642 char *msg; 643 { 644 int c, pri; 645 char *p, *q, line[MAXLINE + 1]; 646 647 /* test for special codes */ 648 pri = DEFUPRI; 649 p = msg; 650 if (*p == '<') { 651 pri = 0; 652 while (isdigit(*++p)) 653 pri = 10 * pri + (*p - '0'); 654 if (*p == '>') 655 ++p; 656 } 657 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 658 pri = DEFUPRI; 659 660 /* don't allow users to log kernel messages */ 661 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 662 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 663 664 q = line; 665 666 while ((c = (unsigned char)*p++) != '\0' && 667 q < &line[sizeof(line) - 4]) { 668 if ((c & 0x80) && c < 0xA0) { 669 c &= 0x7F; 670 *q++ = 'M'; 671 *q++ = '-'; 672 } 673 if (isascii(c) && iscntrl(c)) { 674 if (c == '\n') 675 *q++ = ' '; 676 else if (c == '\t') 677 *q++ = '\t'; 678 else { 679 *q++ = '^'; 680 *q++ = c ^ 0100; 681 } 682 } else 683 *q++ = c; 684 } 685 *q = '\0'; 686 687 logmsg(pri, line, hname, 0); 688 } 689 690 /* 691 * Read /dev/klog while data are available, split into lines. 692 */ 693 void 694 readklog() 695 { 696 char *p, *q, line[MAXLINE + 1]; 697 int len, i; 698 699 len = 0; 700 for (;;) { 701 i = read(fklog, line + len, MAXLINE - 1 - len); 702 if (i > 0) 703 line[i + len] = '\0'; 704 else if (i < 0 && errno != EINTR && errno != EAGAIN) { 705 logerror("klog"); 706 fklog = -1; 707 break; 708 } else 709 break; 710 711 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 712 *q = '\0'; 713 printsys(p); 714 } 715 len = strlen(p); 716 if (len >= MAXLINE - 1) { 717 printsys(p); 718 len = 0; 719 } 720 if (len > 0) 721 memmove(line, p, len + 1); 722 } 723 if (len > 0) 724 printsys(line); 725 } 726 727 /* 728 * Take a raw input line from /dev/klog, format similar to syslog(). 729 */ 730 void 731 printsys(p) 732 char *p; 733 { 734 int pri, flags; 735 736 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 737 pri = DEFSPRI; 738 if (*p == '<') { 739 pri = 0; 740 while (isdigit(*++p)) 741 pri = 10 * pri + (*p - '0'); 742 if (*p == '>') 743 ++p; 744 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 745 flags |= IGN_CONS; 746 } else { 747 /* kernel printf's come out on console */ 748 flags |= IGN_CONS; 749 } 750 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 751 pri = DEFSPRI; 752 logmsg(pri, p, LocalHostName, flags); 753 } 754 755 time_t now; 756 757 /* 758 * Log a message to the appropriate log files, users, etc. based on 759 * the priority. 760 */ 761 void 762 logmsg(pri, msg, from, flags) 763 int pri; 764 const char *msg, *from; 765 int flags; 766 { 767 struct filed *f; 768 int i, fac, msglen, omask, prilev; 769 const char *timestamp; 770 char prog[NAME_MAX+1]; 771 char buf[MAXLINE+1]; 772 773 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 774 pri, flags, from, msg); 775 776 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 777 778 /* 779 * Check to see if msg looks non-standard. 780 */ 781 msglen = strlen(msg); 782 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 783 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 784 flags |= ADDDATE; 785 786 (void)time(&now); 787 if (flags & ADDDATE) 788 timestamp = ctime(&now) + 4; 789 else { 790 timestamp = msg; 791 msg += 16; 792 msglen -= 16; 793 } 794 795 /* skip leading blanks */ 796 while (isspace(*msg)) { 797 msg++; 798 msglen--; 799 } 800 801 /* extract facility and priority level */ 802 if (flags & MARK) 803 fac = LOG_NFACILITIES; 804 else 805 fac = LOG_FAC(pri); 806 prilev = LOG_PRI(pri); 807 808 /* extract program name */ 809 for (i = 0; i < NAME_MAX; i++) { 810 if (!isalnum(msg[i])) 811 break; 812 prog[i] = msg[i]; 813 } 814 prog[i] = 0; 815 816 /* add kernel prefix for kernel messages */ 817 if (flags & ISKERNEL) { 818 snprintf(buf, sizeof(buf), "%s: %s", 819 use_bootfile ? bootfile : "kernel", msg); 820 msg = buf; 821 msglen = strlen(buf); 822 } 823 824 /* log the message to the particular outputs */ 825 if (!Initialized) { 826 f = &consfile; 827 f->f_file = open(ctty, O_WRONLY, 0); 828 829 if (f->f_file >= 0) { 830 fprintlog(f, flags, msg); 831 (void)close(f->f_file); 832 } 833 (void)sigsetmask(omask); 834 return; 835 } 836 for (f = Files; f; f = f->f_next) { 837 /* skip messages that are incorrect priority */ 838 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 839 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 840 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 841 ) 842 || f->f_pmask[fac] == INTERNAL_NOPRI) 843 continue; 844 /* skip messages with the incorrect hostname */ 845 if (f->f_host) 846 switch (f->f_host[0]) { 847 case '+': 848 if (strcmp(from, f->f_host + 1) != 0) 849 continue; 850 break; 851 case '-': 852 if (strcmp(from, f->f_host + 1) == 0) 853 continue; 854 break; 855 } 856 857 /* skip messages with the incorrect program name */ 858 if (f->f_program) 859 if (strcmp(prog, f->f_program) != 0) 860 continue; 861 862 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 863 continue; 864 865 /* don't output marks to recently written files */ 866 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 867 continue; 868 869 /* 870 * suppress duplicate lines to this file 871 */ 872 if (no_compress - (f->f_type != F_PIPE) < 1 && 873 (flags & MARK) == 0 && msglen == f->f_prevlen && 874 !strcmp(msg, f->f_prevline) && 875 !strcasecmp(from, f->f_prevhost)) { 876 (void)strlcpy(f->f_lasttime, timestamp, 16); 877 f->f_prevcount++; 878 dprintf("msg repeated %d times, %ld sec of %d\n", 879 f->f_prevcount, (long)(now - f->f_time), 880 repeatinterval[f->f_repeatcount]); 881 /* 882 * If domark would have logged this by now, 883 * flush it now (so we don't hold isolated messages), 884 * but back off so we'll flush less often 885 * in the future. 886 */ 887 if (now > REPEATTIME(f)) { 888 fprintlog(f, flags, (char *)NULL); 889 BACKOFF(f); 890 } 891 } else { 892 /* new line, save it */ 893 if (f->f_prevcount) 894 fprintlog(f, 0, (char *)NULL); 895 f->f_repeatcount = 0; 896 f->f_prevpri = pri; 897 (void)strlcpy(f->f_lasttime, timestamp, 16); 898 (void)strlcpy(f->f_prevhost, from, 899 sizeof(f->f_prevhost)); 900 if (msglen < MAXSVLINE) { 901 f->f_prevlen = msglen; 902 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 903 fprintlog(f, flags, (char *)NULL); 904 } else { 905 f->f_prevline[0] = 0; 906 f->f_prevlen = 0; 907 fprintlog(f, flags, msg); 908 } 909 } 910 } 911 (void)sigsetmask(omask); 912 } 913 914 void 915 fprintlog(f, flags, msg) 916 struct filed *f; 917 int flags; 918 const char *msg; 919 { 920 struct iovec iov[7]; 921 struct iovec *v; 922 struct addrinfo *r; 923 int i, l, lsent = 0; 924 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 925 const char *msgret; 926 927 v = iov; 928 if (f->f_type == F_WALL) { 929 v->iov_base = greetings; 930 v->iov_len = snprintf(greetings, sizeof greetings, 931 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 932 f->f_prevhost, ctime(&now)); 933 if (v->iov_len > 0) 934 v++; 935 v->iov_base = ""; 936 v->iov_len = 0; 937 v++; 938 } else { 939 v->iov_base = f->f_lasttime; 940 v->iov_len = 15; 941 v++; 942 v->iov_base = " "; 943 v->iov_len = 1; 944 v++; 945 } 946 947 if (LogFacPri) { 948 static char fp_buf[30]; /* Hollow laugh */ 949 int fac = f->f_prevpri & LOG_FACMASK; 950 int pri = LOG_PRI(f->f_prevpri); 951 const char *f_s = NULL; 952 char f_n[5]; /* Hollow laugh */ 953 const char *p_s = NULL; 954 char p_n[5]; /* Hollow laugh */ 955 956 if (LogFacPri > 1) { 957 CODE *c; 958 959 for (c = facilitynames; c->c_name; c++) { 960 if (c->c_val == fac) { 961 f_s = c->c_name; 962 break; 963 } 964 } 965 for (c = prioritynames; c->c_name; c++) { 966 if (c->c_val == pri) { 967 p_s = c->c_name; 968 break; 969 } 970 } 971 } 972 if (!f_s) { 973 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 974 f_s = f_n; 975 } 976 if (!p_s) { 977 snprintf(p_n, sizeof p_n, "%d", pri); 978 p_s = p_n; 979 } 980 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 981 v->iov_base = fp_buf; 982 v->iov_len = strlen(fp_buf); 983 } else { 984 v->iov_base=""; 985 v->iov_len = 0; 986 } 987 v++; 988 989 v->iov_base = f->f_prevhost; 990 v->iov_len = strlen(v->iov_base); 991 v++; 992 v->iov_base = " "; 993 v->iov_len = 1; 994 v++; 995 996 if (msg) { 997 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 998 if (wmsg == NULL) { 999 logerror("strdup"); 1000 exit(1); 1001 } 1002 v->iov_base = wmsg; 1003 v->iov_len = strlen(msg); 1004 } else if (f->f_prevcount > 1) { 1005 v->iov_base = repbuf; 1006 v->iov_len = snprintf(repbuf, sizeof repbuf, 1007 "last message repeated %d times", f->f_prevcount); 1008 } else { 1009 v->iov_base = f->f_prevline; 1010 v->iov_len = f->f_prevlen; 1011 } 1012 v++; 1013 1014 dprintf("Logging to %s", TypeNames[f->f_type]); 1015 f->f_time = now; 1016 1017 switch (f->f_type) { 1018 case F_UNUSED: 1019 dprintf("\n"); 1020 break; 1021 1022 case F_FORW: 1023 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1024 /* check for local vs remote messages */ 1025 if (strcasecmp(f->f_prevhost, LocalHostName)) 1026 l = snprintf(line, sizeof line - 1, 1027 "<%d>%.15s Forwarded from %s: %s", 1028 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1029 iov[5].iov_base); 1030 else 1031 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1032 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1033 if (l < 0) 1034 l = 0; 1035 else if (l > MAXLINE) 1036 l = MAXLINE; 1037 1038 if (finet) { 1039 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1040 for (i = 0; i < *finet; i++) { 1041 #if 0 1042 /* 1043 * should we check AF first, or just 1044 * trial and error? FWD 1045 */ 1046 if (r->ai_family == 1047 address_family_of(finet[i+1])) 1048 #endif 1049 lsent = sendto(finet[i+1], line, l, 0, 1050 r->ai_addr, r->ai_addrlen); 1051 if (lsent == l) 1052 break; 1053 } 1054 if (lsent == l && !send_to_all) 1055 break; 1056 } 1057 if (lsent != l) { 1058 int e = errno; 1059 (void)close(f->f_file); 1060 errno = e; 1061 f->f_type = F_UNUSED; 1062 logerror("sendto"); 1063 } 1064 } 1065 break; 1066 1067 case F_FILE: 1068 dprintf(" %s\n", f->f_un.f_fname); 1069 v->iov_base = "\n"; 1070 v->iov_len = 1; 1071 if (writev(f->f_file, iov, 7) < 0) { 1072 int e = errno; 1073 (void)close(f->f_file); 1074 f->f_type = F_UNUSED; 1075 errno = e; 1076 logerror(f->f_un.f_fname); 1077 } else if (flags & SYNC_FILE) 1078 (void)fsync(f->f_file); 1079 break; 1080 1081 case F_PIPE: 1082 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1083 v->iov_base = "\n"; 1084 v->iov_len = 1; 1085 if (f->f_un.f_pipe.f_pid == 0) { 1086 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1087 &f->f_un.f_pipe.f_pid)) < 0) { 1088 f->f_type = F_UNUSED; 1089 logerror(f->f_un.f_pipe.f_pname); 1090 break; 1091 } 1092 } 1093 if (writev(f->f_file, iov, 7) < 0) { 1094 int e = errno; 1095 (void)close(f->f_file); 1096 if (f->f_un.f_pipe.f_pid > 0) 1097 deadq_enter(f->f_un.f_pipe.f_pid, 1098 f->f_un.f_pipe.f_pname); 1099 f->f_un.f_pipe.f_pid = 0; 1100 errno = e; 1101 logerror(f->f_un.f_pipe.f_pname); 1102 } 1103 break; 1104 1105 case F_CONSOLE: 1106 if (flags & IGN_CONS) { 1107 dprintf(" (ignored)\n"); 1108 break; 1109 } 1110 /* FALLTHROUGH */ 1111 1112 case F_TTY: 1113 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1114 v->iov_base = "\r\n"; 1115 v->iov_len = 2; 1116 1117 errno = 0; /* ttymsg() only sometimes returns an errno */ 1118 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1119 f->f_type = F_UNUSED; 1120 logerror(msgret); 1121 } 1122 break; 1123 1124 case F_USERS: 1125 case F_WALL: 1126 dprintf("\n"); 1127 v->iov_base = "\r\n"; 1128 v->iov_len = 2; 1129 wallmsg(f, iov); 1130 break; 1131 } 1132 f->f_prevcount = 0; 1133 if (msg) 1134 free(wmsg); 1135 } 1136 1137 /* 1138 * WALLMSG -- Write a message to the world at large 1139 * 1140 * Write the specified message to either the entire 1141 * world, or a list of approved users. 1142 */ 1143 void 1144 wallmsg(f, iov) 1145 struct filed *f; 1146 struct iovec *iov; 1147 { 1148 static int reenter; /* avoid calling ourselves */ 1149 FILE *uf; 1150 struct utmp ut; 1151 int i; 1152 const char *p; 1153 char line[sizeof(ut.ut_line) + 1]; 1154 1155 if (reenter++) 1156 return; 1157 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1158 logerror(_PATH_UTMP); 1159 reenter = 0; 1160 return; 1161 } 1162 /* NOSTRICT */ 1163 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1164 if (ut.ut_name[0] == '\0') 1165 continue; 1166 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1167 if (f->f_type == F_WALL) { 1168 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1169 errno = 0; /* already in msg */ 1170 logerror(p); 1171 } 1172 continue; 1173 } 1174 /* should we send the message to this user? */ 1175 for (i = 0; i < MAXUNAMES; i++) { 1176 if (!f->f_un.f_uname[i][0]) 1177 break; 1178 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1179 UT_NAMESIZE)) { 1180 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1181 != NULL) { 1182 errno = 0; /* already in msg */ 1183 logerror(p); 1184 } 1185 break; 1186 } 1187 } 1188 } 1189 (void)fclose(uf); 1190 reenter = 0; 1191 } 1192 1193 void 1194 reapchild(signo) 1195 int signo __unused; 1196 { 1197 int status; 1198 pid_t pid; 1199 struct filed *f; 1200 1201 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1202 if (!Initialized) 1203 /* Don't tell while we are initting. */ 1204 continue; 1205 1206 /* First, look if it's a process from the dead queue. */ 1207 if (deadq_remove(pid)) 1208 goto oncemore; 1209 1210 /* Now, look in list of active processes. */ 1211 for (f = Files; f; f = f->f_next) 1212 if (f->f_type == F_PIPE && 1213 f->f_un.f_pipe.f_pid == pid) { 1214 (void)close(f->f_file); 1215 f->f_un.f_pipe.f_pid = 0; 1216 log_deadchild(pid, status, 1217 f->f_un.f_pipe.f_pname); 1218 break; 1219 } 1220 oncemore: 1221 continue; 1222 } 1223 } 1224 1225 /* 1226 * Return a printable representation of a host address. 1227 */ 1228 const char * 1229 cvthname(f) 1230 struct sockaddr *f; 1231 { 1232 int error; 1233 sigset_t omask, nmask; 1234 char *p; 1235 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1236 1237 error = getnameinfo((struct sockaddr *)f, 1238 ((struct sockaddr *)f)->sa_len, 1239 ip, sizeof ip, NULL, 0, 1240 NI_NUMERICHOST | withscopeid); 1241 dprintf("cvthname(%s)\n", ip); 1242 1243 if (error) { 1244 dprintf("Malformed from address %s\n", gai_strerror(error)); 1245 return ("???"); 1246 } 1247 if (!resolve) 1248 return (ip); 1249 1250 sigemptyset(&nmask); 1251 sigaddset(&nmask, SIGHUP); 1252 sigprocmask(SIG_BLOCK, &nmask, &omask); 1253 error = getnameinfo((struct sockaddr *)f, 1254 ((struct sockaddr *)f)->sa_len, 1255 hname, sizeof hname, NULL, 0, 1256 NI_NAMEREQD | withscopeid); 1257 sigprocmask(SIG_SETMASK, &omask, NULL); 1258 if (error) { 1259 dprintf("Host name for your address (%s) unknown\n", ip); 1260 return (ip); 1261 } 1262 /* XXX Not quite correct, but close enough for government work. */ 1263 if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0) 1264 *p = '\0'; 1265 return (hname); 1266 } 1267 1268 void 1269 dodie(signo) 1270 int signo; 1271 { 1272 1273 WantDie = signo; 1274 } 1275 1276 void 1277 domark(signo) 1278 int signo __unused; 1279 { 1280 1281 MarkSet = 1; 1282 } 1283 1284 /* 1285 * Print syslogd errors some place. 1286 */ 1287 void 1288 logerror(type) 1289 const char *type; 1290 { 1291 char buf[512]; 1292 1293 if (errno) 1294 (void)snprintf(buf, 1295 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1296 else 1297 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1298 errno = 0; 1299 dprintf("%s\n", buf); 1300 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1301 } 1302 1303 void 1304 die(signo) 1305 int signo; 1306 { 1307 struct filed *f; 1308 int was_initialized; 1309 char buf[100]; 1310 int i; 1311 1312 was_initialized = Initialized; 1313 Initialized = 0; /* Don't log SIGCHLDs. */ 1314 for (f = Files; f != NULL; f = f->f_next) { 1315 /* flush any pending output */ 1316 if (f->f_prevcount) 1317 fprintlog(f, 0, (char *)NULL); 1318 if (f->f_type == F_PIPE) 1319 (void)close(f->f_file); 1320 } 1321 Initialized = was_initialized; 1322 if (signo) { 1323 dprintf("syslogd: exiting on signal %d\n", signo); 1324 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1325 errno = 0; 1326 logerror(buf); 1327 } 1328 for (i = 0; i < nfunix; i++) 1329 if (funixn[i] && funix[i] != -1) 1330 (void)unlink(funixn[i]); 1331 exit(1); 1332 } 1333 1334 /* 1335 * INIT -- Initialize syslogd from configuration table 1336 */ 1337 void 1338 init(signo) 1339 int signo; 1340 { 1341 int i; 1342 FILE *cf; 1343 struct filed *f, *next, **nextp; 1344 char *p; 1345 char cline[LINE_MAX]; 1346 char prog[NAME_MAX+1]; 1347 char host[MAXHOSTNAMELEN]; 1348 char oldLocalHostName[MAXHOSTNAMELEN]; 1349 char hostMsg[2*MAXHOSTNAMELEN+40]; 1350 char bootfileMsg[LINE_MAX]; 1351 1352 dprintf("init\n"); 1353 1354 /* 1355 * Load hostname (may have changed). 1356 */ 1357 if (signo != 0) 1358 (void)strlcpy(oldLocalHostName, LocalHostName, 1359 sizeof(oldLocalHostName)); 1360 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1361 err(EX_OSERR, "gethostname() failed"); 1362 if ((p = strchr(LocalHostName, '.')) != NULL) { 1363 *p++ = '\0'; 1364 LocalDomain = p; 1365 } else 1366 LocalDomain = ""; 1367 1368 /* 1369 * Close all open log files. 1370 */ 1371 Initialized = 0; 1372 for (f = Files; f != NULL; f = next) { 1373 /* flush any pending output */ 1374 if (f->f_prevcount) 1375 fprintlog(f, 0, (char *)NULL); 1376 1377 switch (f->f_type) { 1378 case F_FILE: 1379 case F_FORW: 1380 case F_CONSOLE: 1381 case F_TTY: 1382 (void)close(f->f_file); 1383 break; 1384 case F_PIPE: 1385 (void)close(f->f_file); 1386 if (f->f_un.f_pipe.f_pid > 0) 1387 deadq_enter(f->f_un.f_pipe.f_pid, 1388 f->f_un.f_pipe.f_pname); 1389 f->f_un.f_pipe.f_pid = 0; 1390 break; 1391 } 1392 next = f->f_next; 1393 if (f->f_program) free(f->f_program); 1394 if (f->f_host) free(f->f_host); 1395 free((char *)f); 1396 } 1397 Files = NULL; 1398 nextp = &Files; 1399 1400 /* open the configuration file */ 1401 if ((cf = fopen(ConfFile, "r")) == NULL) { 1402 dprintf("cannot open %s\n", ConfFile); 1403 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1404 if (*nextp == NULL) { 1405 logerror("calloc"); 1406 exit(1); 1407 } 1408 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1409 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1410 if ((*nextp)->f_next == NULL) { 1411 logerror("calloc"); 1412 exit(1); 1413 } 1414 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1415 Initialized = 1; 1416 return; 1417 } 1418 1419 /* 1420 * Foreach line in the conf table, open that file. 1421 */ 1422 f = NULL; 1423 (void)strlcpy(host, "*", sizeof(host)); 1424 (void)strlcpy(prog, "*", sizeof(prog)); 1425 while (fgets(cline, sizeof(cline), cf) != NULL) { 1426 /* 1427 * check for end-of-section, comments, strip off trailing 1428 * spaces and newline character. #!prog is treated specially: 1429 * following lines apply only to that program. 1430 */ 1431 for (p = cline; isspace(*p); ++p) 1432 continue; 1433 if (*p == 0) 1434 continue; 1435 if (*p == '#') { 1436 p++; 1437 if (*p != '!' && *p != '+' && *p != '-') 1438 continue; 1439 } 1440 if (*p == '+' || *p == '-') { 1441 host[0] = *p++; 1442 while (isspace(*p)) 1443 p++; 1444 if ((!*p) || (*p == '*')) { 1445 (void)strlcpy(host, "*", sizeof(host)); 1446 continue; 1447 } 1448 if (*p == '@') 1449 p = LocalHostName; 1450 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1451 if (!isalnum(*p) && *p != '.' && *p != '-') 1452 break; 1453 host[i] = *p++; 1454 } 1455 host[i] = '\0'; 1456 continue; 1457 } 1458 if (*p == '!') { 1459 p++; 1460 while (isspace(*p)) p++; 1461 if ((!*p) || (*p == '*')) { 1462 (void)strlcpy(prog, "*", sizeof(prog)); 1463 continue; 1464 } 1465 for (i = 0; i < NAME_MAX; i++) { 1466 if (!isalnum(p[i])) 1467 break; 1468 prog[i] = p[i]; 1469 } 1470 prog[i] = 0; 1471 continue; 1472 } 1473 for (p = strchr(cline, '\0'); isspace(*--p);) 1474 continue; 1475 *++p = '\0'; 1476 f = (struct filed *)calloc(1, sizeof(*f)); 1477 if (f == NULL) { 1478 logerror("calloc"); 1479 exit(1); 1480 } 1481 *nextp = f; 1482 nextp = &f->f_next; 1483 cfline(cline, f, prog, host); 1484 } 1485 1486 /* close the configuration file */ 1487 (void)fclose(cf); 1488 1489 Initialized = 1; 1490 1491 if (Debug) { 1492 for (f = Files; f; f = f->f_next) { 1493 for (i = 0; i <= LOG_NFACILITIES; i++) 1494 if (f->f_pmask[i] == INTERNAL_NOPRI) 1495 printf("X "); 1496 else 1497 printf("%d ", f->f_pmask[i]); 1498 printf("%s: ", TypeNames[f->f_type]); 1499 switch (f->f_type) { 1500 case F_FILE: 1501 printf("%s", f->f_un.f_fname); 1502 break; 1503 1504 case F_CONSOLE: 1505 case F_TTY: 1506 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1507 break; 1508 1509 case F_FORW: 1510 printf("%s", f->f_un.f_forw.f_hname); 1511 break; 1512 1513 case F_PIPE: 1514 printf("%s", f->f_un.f_pipe.f_pname); 1515 break; 1516 1517 case F_USERS: 1518 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1519 printf("%s, ", f->f_un.f_uname[i]); 1520 break; 1521 } 1522 if (f->f_program) 1523 printf(" (%s)", f->f_program); 1524 printf("\n"); 1525 } 1526 } 1527 1528 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1529 dprintf("syslogd: restarted\n"); 1530 /* 1531 * Log a change in hostname, but only on a restart. 1532 */ 1533 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1534 (void)snprintf(hostMsg, sizeof(hostMsg), 1535 "syslogd: hostname changed, \"%s\" to \"%s\"", 1536 oldLocalHostName, LocalHostName); 1537 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1538 dprintf("%s\n", hostMsg); 1539 } 1540 /* 1541 * Log the kernel boot file if we aren't going to use it as 1542 * the prefix, and if this is *not* a restart. 1543 */ 1544 if (signo == 0 && !use_bootfile) { 1545 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1546 "syslogd: kernel boot file is %s", bootfile); 1547 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1548 dprintf("%s\n", bootfileMsg); 1549 } 1550 } 1551 1552 /* 1553 * Crack a configuration file line 1554 */ 1555 void 1556 cfline(line, f, prog, host) 1557 const char *line; 1558 struct filed *f; 1559 const char *prog; 1560 const char *host; 1561 { 1562 struct addrinfo hints, *res; 1563 int error, i, pri; 1564 const char *p, *q; 1565 char *bp; 1566 char buf[MAXLINE], ebuf[100]; 1567 1568 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1569 1570 errno = 0; /* keep strerror() stuff out of logerror messages */ 1571 1572 /* clear out file entry */ 1573 memset(f, 0, sizeof(*f)); 1574 for (i = 0; i <= LOG_NFACILITIES; i++) 1575 f->f_pmask[i] = INTERNAL_NOPRI; 1576 1577 /* save hostname if any */ 1578 if (host && *host == '*') 1579 host = NULL; 1580 if (host) { 1581 int hl, dl; 1582 1583 f->f_host = strdup(host); 1584 if (f->f_host == NULL) { 1585 logerror("strdup"); 1586 exit(1); 1587 } 1588 hl = strlen(f->f_host); 1589 if (f->f_host[hl-1] == '.') 1590 f->f_host[--hl] = '\0'; 1591 dl = strlen(LocalDomain) + 1; 1592 if (hl > dl && f->f_host[hl-dl] == '.' && 1593 strcasecmp(f->f_host + hl - dl + 1, LocalDomain) == 0) 1594 f->f_host[hl-dl] = '\0'; 1595 } 1596 1597 /* save program name if any */ 1598 if (prog && *prog == '*') 1599 prog = NULL; 1600 if (prog) { 1601 f->f_program = strdup(prog); 1602 if (f->f_program == NULL) { 1603 logerror("strdup"); 1604 exit(1); 1605 } 1606 } 1607 1608 /* scan through the list of selectors */ 1609 for (p = line; *p && *p != '\t' && *p != ' ';) { 1610 int pri_done; 1611 int pri_cmp; 1612 1613 /* find the end of this facility name list */ 1614 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1615 continue; 1616 1617 /* get the priority comparison */ 1618 pri_cmp = 0; 1619 pri_done = 0; 1620 while (!pri_done) { 1621 switch (*q) { 1622 case '<': 1623 pri_cmp |= PRI_LT; 1624 q++; 1625 break; 1626 case '=': 1627 pri_cmp |= PRI_EQ; 1628 q++; 1629 break; 1630 case '>': 1631 pri_cmp |= PRI_GT; 1632 q++; 1633 break; 1634 default: 1635 pri_done++; 1636 break; 1637 } 1638 } 1639 if (!pri_cmp) 1640 pri_cmp = (UniquePriority) 1641 ? (PRI_EQ) 1642 : (PRI_EQ | PRI_GT) 1643 ; 1644 1645 /* collect priority name */ 1646 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1647 *bp++ = *q++; 1648 *bp = '\0'; 1649 1650 /* skip cruft */ 1651 while (strchr(",;", *q)) 1652 q++; 1653 1654 /* decode priority name */ 1655 if (*buf == '*') 1656 pri = LOG_PRIMASK + 1; 1657 else { 1658 pri = decode(buf, prioritynames); 1659 if (pri < 0) { 1660 (void)snprintf(ebuf, sizeof ebuf, 1661 "unknown priority name \"%s\"", buf); 1662 logerror(ebuf); 1663 return; 1664 } 1665 } 1666 1667 /* scan facilities */ 1668 while (*p && !strchr("\t.; ", *p)) { 1669 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1670 *bp++ = *p++; 1671 *bp = '\0'; 1672 1673 if (*buf == '*') 1674 for (i = 0; i < LOG_NFACILITIES; i++) { 1675 f->f_pmask[i] = pri; 1676 f->f_pcmp[i] = pri_cmp; 1677 } 1678 else { 1679 i = decode(buf, facilitynames); 1680 if (i < 0) { 1681 (void)snprintf(ebuf, sizeof ebuf, 1682 "unknown facility name \"%s\"", 1683 buf); 1684 logerror(ebuf); 1685 return; 1686 } 1687 f->f_pmask[i >> 3] = pri; 1688 f->f_pcmp[i >> 3] = pri_cmp; 1689 } 1690 while (*p == ',' || *p == ' ') 1691 p++; 1692 } 1693 1694 p = q; 1695 } 1696 1697 /* skip to action part */ 1698 while (*p == '\t' || *p == ' ') 1699 p++; 1700 1701 switch (*p) 1702 { 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 int 1771 decode(name, codetab) 1772 const char *name; 1773 CODE *codetab; 1774 { 1775 CODE *c; 1776 char *p, buf[40]; 1777 1778 if (isdigit(*name)) 1779 return (atoi(name)); 1780 1781 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1782 if (isupper(*name)) 1783 *p = tolower(*name); 1784 else 1785 *p = *name; 1786 } 1787 *p = '\0'; 1788 for (c = codetab; c->c_name; c++) 1789 if (!strcmp(buf, c->c_name)) 1790 return (c->c_val); 1791 1792 return (-1); 1793 } 1794 1795 void 1796 markit(void) 1797 { 1798 struct filed *f; 1799 dq_t q; 1800 1801 now = time((time_t *)NULL); 1802 MarkSeq += TIMERINTVL; 1803 if (MarkSeq >= MarkInterval) { 1804 logmsg(LOG_INFO, "-- MARK --", 1805 LocalHostName, ADDDATE|MARK); 1806 MarkSeq = 0; 1807 } 1808 1809 for (f = Files; f; f = f->f_next) { 1810 if (f->f_prevcount && now >= REPEATTIME(f)) { 1811 dprintf("flush %s: repeated %d times, %d sec.\n", 1812 TypeNames[f->f_type], f->f_prevcount, 1813 repeatinterval[f->f_repeatcount]); 1814 fprintlog(f, 0, (char *)NULL); 1815 BACKOFF(f); 1816 } 1817 } 1818 1819 /* Walk the dead queue, and see if we should signal somebody. */ 1820 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 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 MarkSet = 0; 1845 (void)alarm(TIMERINTVL); 1846 } 1847 1848 /* 1849 * fork off and become a daemon, but wait for the child to come online 1850 * before returing to the parent, or we get disk thrashing at boot etc. 1851 * Set a timer so we don't hang forever if it wedges. 1852 */ 1853 int 1854 waitdaemon(nochdir, noclose, maxwait) 1855 int nochdir, noclose, 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 void 1908 timedout(sig) 1909 int sig __unused; 1910 { 1911 int left; 1912 left = alarm(0); 1913 signal(SIGALRM, SIG_DFL); 1914 if (left == 0) 1915 errx(1, "timed out waiting for child"); 1916 else 1917 _exit(0); 1918 } 1919 1920 /* 1921 * Add `s' to the list of allowable peer addresses to accept messages 1922 * from. 1923 * 1924 * `s' is a string in the form: 1925 * 1926 * [*]domainname[:{servicename|portnumber|*}] 1927 * 1928 * or 1929 * 1930 * netaddr/maskbits[:{servicename|portnumber|*}] 1931 * 1932 * Returns -1 on error, 0 if the argument was valid. 1933 */ 1934 int 1935 allowaddr(s) 1936 char *s; 1937 { 1938 char *cp1, *cp2; 1939 struct allowedpeer ap; 1940 struct servent *se; 1941 int masklen = -1, i; 1942 struct addrinfo hints, *res; 1943 struct in_addr *addrp, *maskp; 1944 u_int32_t *addr6p, *mask6p; 1945 char ip[NI_MAXHOST]; 1946 1947 #ifdef INET6 1948 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1949 #endif 1950 cp1 = s; 1951 if ((cp1 = strrchr(cp1, ':'))) { 1952 /* service/port provided */ 1953 *cp1++ = '\0'; 1954 if (strlen(cp1) == 1 && *cp1 == '*') 1955 /* any port allowed */ 1956 ap.port = 0; 1957 else if ((se = getservbyname(cp1, "udp"))) 1958 ap.port = ntohs(se->s_port); 1959 else { 1960 ap.port = strtol(cp1, &cp2, 0); 1961 if (*cp2 != '\0') 1962 return -1; /* port not numeric */ 1963 } 1964 } else { 1965 if ((se = getservbyname("syslog", "udp"))) 1966 ap.port = ntohs(se->s_port); 1967 else 1968 /* sanity, should not happen */ 1969 ap.port = 514; 1970 } 1971 1972 if ((cp1 = strchr(s, '/')) != NULL && 1973 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 1974 *cp1 = '\0'; 1975 if ((masklen = atoi(cp1 + 1)) < 0) 1976 return -1; 1977 } 1978 #ifdef INET6 1979 if (*s == '[') { 1980 cp2 = s + strlen(s) - 1; 1981 if (*cp2 == ']') { 1982 ++s; 1983 *cp2 = '\0'; 1984 } else 1985 cp2 = NULL; 1986 } else 1987 cp2 = NULL; 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 printf("port = %d\n", ap.port); 2081 } 2082 2083 if ((AllowedPeers = realloc(AllowedPeers, 2084 ++NumAllowed * sizeof(struct allowedpeer))) 2085 == NULL) { 2086 logerror("realloc"); 2087 exit(1); 2088 } 2089 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2090 return 0; 2091 } 2092 2093 /* 2094 * Validate that the remote peer has permission to log to us. 2095 */ 2096 int 2097 validate(sa, hname) 2098 struct sockaddr *sa; 2099 const char *hname; 2100 { 2101 int i, j, reject; 2102 size_t l1, l2; 2103 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2104 struct allowedpeer *ap; 2105 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2106 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2107 struct addrinfo hints, *res; 2108 u_short sport; 2109 2110 if (NumAllowed == 0) 2111 /* traditional behaviour, allow everything */ 2112 return 1; 2113 2114 (void)strlcpy(name, hname, sizeof(name)); 2115 memset(&hints, 0, sizeof(hints)); 2116 hints.ai_family = PF_UNSPEC; 2117 hints.ai_socktype = SOCK_DGRAM; 2118 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2119 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2120 freeaddrinfo(res); 2121 else if (strchr(name, '.') == NULL) { 2122 strlcat(name, ".", sizeof name); 2123 strlcat(name, LocalDomain, sizeof name); 2124 } 2125 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2126 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2127 return 0; /* for safety, should not occur */ 2128 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2129 ip, port, name); 2130 sport = atoi(port); 2131 2132 /* now, walk down the list */ 2133 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2134 if (ap->port != 0 && ap->port != sport) { 2135 dprintf("rejected in rule %d due to port mismatch.\n", i); 2136 continue; 2137 } 2138 2139 if (ap->isnumeric) { 2140 if (ap->a_addr.ss_family != sa->sa_family) { 2141 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2142 continue; 2143 } 2144 if (ap->a_addr.ss_family == AF_INET) { 2145 sin4 = (struct sockaddr_in *)sa; 2146 a4p = (struct sockaddr_in *)&ap->a_addr; 2147 m4p = (struct sockaddr_in *)&ap->a_mask; 2148 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2149 != a4p->sin_addr.s_addr) { 2150 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2151 continue; 2152 } 2153 } 2154 #ifdef INET6 2155 else if (ap->a_addr.ss_family == AF_INET6) { 2156 sin6 = (struct sockaddr_in6 *)sa; 2157 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2158 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2159 #ifdef NI_WITHSCOPEID 2160 if (a6p->sin6_scope_id != 0 && 2161 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2162 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2163 continue; 2164 } 2165 #endif 2166 reject = 0; 2167 for (j = 0; j < 16; j += 4) { 2168 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2169 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2170 ++reject; 2171 break; 2172 } 2173 } 2174 if (reject) { 2175 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2176 continue; 2177 } 2178 } 2179 #endif 2180 else 2181 continue; 2182 } else { 2183 cp = ap->a_name; 2184 l1 = strlen(name); 2185 if (*cp == '*') { 2186 /* allow wildmatch */ 2187 cp++; 2188 l2 = strlen(cp); 2189 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2190 dprintf("rejected in rule %d due to name mismatch.\n", i); 2191 continue; 2192 } 2193 } else { 2194 /* exact match */ 2195 l2 = strlen(cp); 2196 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2197 dprintf("rejected in rule %d due to name mismatch.\n", i); 2198 continue; 2199 } 2200 } 2201 } 2202 dprintf("accepted in rule %d.\n", i); 2203 return 1; /* hooray! */ 2204 } 2205 return 0; 2206 } 2207 2208 /* 2209 * Fairly similar to popen(3), but returns an open descriptor, as 2210 * opposed to a FILE *. 2211 */ 2212 int 2213 p_open(prog, pid) 2214 const char *prog; 2215 pid_t *pid; 2216 { 2217 int pfd[2], nulldesc, i; 2218 sigset_t omask, mask; 2219 char *argv[4]; /* sh -c cmd NULL */ 2220 char errmsg[200]; 2221 2222 if (pipe(pfd) == -1) 2223 return -1; 2224 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2225 /* we are royally screwed anyway */ 2226 return -1; 2227 2228 sigemptyset(&mask); 2229 sigaddset(&mask, SIGALRM); 2230 sigaddset(&mask, SIGHUP); 2231 sigprocmask(SIG_BLOCK, &mask, &omask); 2232 switch ((*pid = fork())) { 2233 case -1: 2234 sigprocmask(SIG_SETMASK, &omask, 0); 2235 close(nulldesc); 2236 return -1; 2237 2238 case 0: 2239 /* XXX should check for NULL return */ 2240 argv[0] = strdup("sh"); 2241 argv[1] = strdup("-c"); 2242 argv[2] = strdup(prog); 2243 argv[3] = NULL; 2244 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2245 logerror("strdup"); 2246 exit(1); 2247 } 2248 2249 alarm(0); 2250 (void)setsid(); /* Avoid catching SIGHUPs. */ 2251 2252 /* 2253 * Throw away pending signals, and reset signal 2254 * behaviour to standard values. 2255 */ 2256 signal(SIGALRM, SIG_IGN); 2257 signal(SIGHUP, SIG_IGN); 2258 sigprocmask(SIG_SETMASK, &omask, 0); 2259 signal(SIGPIPE, SIG_DFL); 2260 signal(SIGQUIT, SIG_DFL); 2261 signal(SIGALRM, SIG_DFL); 2262 signal(SIGHUP, SIG_DFL); 2263 2264 dup2(pfd[0], STDIN_FILENO); 2265 dup2(nulldesc, STDOUT_FILENO); 2266 dup2(nulldesc, STDERR_FILENO); 2267 for (i = getdtablesize(); i > 2; i--) 2268 (void) close(i); 2269 2270 (void) execvp(_PATH_BSHELL, argv); 2271 _exit(255); 2272 } 2273 2274 sigprocmask(SIG_SETMASK, &omask, 0); 2275 close(nulldesc); 2276 close(pfd[0]); 2277 /* 2278 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2279 * supposed to get an EWOULDBLOCK on writev(2), which is 2280 * caught by the logic above anyway, which will in turn close 2281 * the pipe, and fork a new logging subprocess if necessary. 2282 * The stale subprocess will be killed some time later unless 2283 * it terminated itself due to closing its input pipe (so we 2284 * get rid of really dead puppies). 2285 */ 2286 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2287 /* This is bad. */ 2288 (void)snprintf(errmsg, sizeof errmsg, 2289 "Warning: cannot change pipe to PID %d to " 2290 "non-blocking behaviour.", 2291 (int)*pid); 2292 logerror(errmsg); 2293 } 2294 return pfd[1]; 2295 } 2296 2297 void 2298 deadq_enter(pid, name) 2299 pid_t pid; 2300 const char *name; 2301 { 2302 dq_t p; 2303 int status; 2304 2305 /* 2306 * Be paranoid, if we can't signal the process, don't enter it 2307 * into the dead queue (perhaps it's already dead). If possible, 2308 * we try to fetch and log the child's status. 2309 */ 2310 if (kill(pid, 0) != 0) { 2311 if (waitpid(pid, &status, WNOHANG) > 0) 2312 log_deadchild(pid, status, name); 2313 return; 2314 } 2315 2316 p = malloc(sizeof(struct deadq_entry)); 2317 if (p == NULL) { 2318 logerror("malloc"); 2319 exit(1); 2320 } 2321 2322 p->dq_pid = pid; 2323 p->dq_timeout = DQ_TIMO_INIT; 2324 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2325 } 2326 2327 int 2328 deadq_remove(pid) 2329 pid_t pid; 2330 { 2331 dq_t q; 2332 2333 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = TAILQ_NEXT(q, dq_entries)) 2334 if (q->dq_pid == pid) { 2335 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2336 free(q); 2337 return 1; 2338 } 2339 2340 return 0; 2341 } 2342 2343 void 2344 log_deadchild(pid, status, name) 2345 pid_t pid; 2346 int status; 2347 const char *name; 2348 { 2349 int code; 2350 char buf[256]; 2351 const char *reason; 2352 2353 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2354 if (WIFSIGNALED(status)) { 2355 reason = "due to signal"; 2356 code = WTERMSIG(status); 2357 } else { 2358 reason = "with status"; 2359 code = WEXITSTATUS(status); 2360 if (code == 0) 2361 return; 2362 } 2363 (void)snprintf(buf, sizeof buf, 2364 "Logging subprocess %d (%s) exited %s %d.", 2365 pid, name, reason, code); 2366 logerror(buf); 2367 } 2368 2369 int * 2370 socksetup(af, bindhostname) 2371 int af; 2372 const char *bindhostname; 2373 { 2374 struct addrinfo hints, *res, *r; 2375 int error, maxs, *s, *socks; 2376 2377 memset(&hints, 0, sizeof(hints)); 2378 hints.ai_flags = AI_PASSIVE; 2379 hints.ai_family = af; 2380 hints.ai_socktype = SOCK_DGRAM; 2381 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2382 if (error) { 2383 logerror(gai_strerror(error)); 2384 errno = 0; 2385 die(0); 2386 } 2387 2388 /* Count max number of sockets we may open */ 2389 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2390 socks = malloc((maxs+1) * sizeof(int)); 2391 if (socks == NULL) { 2392 logerror("couldn't allocate memory for sockets"); 2393 die(0); 2394 } 2395 2396 *socks = 0; /* num of sockets counter at start of array */ 2397 s = socks + 1; 2398 for (r = res; r; r = r->ai_next) { 2399 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2400 if (*s < 0) { 2401 logerror("socket"); 2402 continue; 2403 } 2404 #ifdef IPV6_BINDV6ONLY 2405 if (r->ai_family == AF_INET6) { 2406 int on = 1; 2407 if (setsockopt(*s, IPPROTO_IPV6, IPV6_BINDV6ONLY, 2408 (char *)&on, sizeof (on)) < 0) { 2409 logerror("setsockopt"); 2410 close(*s); 2411 continue; 2412 } 2413 } 2414 #endif 2415 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2416 close(*s); 2417 logerror("bind"); 2418 continue; 2419 } 2420 2421 (*socks)++; 2422 s++; 2423 } 2424 2425 if (*socks == 0) { 2426 free(socks); 2427 if (Debug) 2428 return(NULL); 2429 else 2430 die(0); 2431 } 2432 if (res) 2433 freeaddrinfo(res); 2434 2435 return(socks); 2436 } 2437