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