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%s\n", 630 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 631 " [-b bind address] [-f config_file]", 632 " [-l log_socket] [-m mark_interval]", 633 " [-P pid_file] [-p log_socket]"); 634 exit(1); 635 } 636 637 /* 638 * Take a raw input line, decode the message, and print the message 639 * on the appropriate log files. 640 */ 641 static void 642 printline(const char *hname, 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 } 686 *q = '\0'; 687 688 logmsg(pri, line, hname, 0); 689 } 690 691 /* 692 * Read /dev/klog while data are available, split into lines. 693 */ 694 static void 695 readklog(void) 696 { 697 char *p, *q, line[MAXLINE + 1]; 698 int len, i; 699 700 len = 0; 701 for (;;) { 702 i = read(fklog, line + len, MAXLINE - 1 - len); 703 if (i > 0) { 704 line[i + len] = '\0'; 705 } else { 706 if (i < 0 && errno != EINTR && errno != EAGAIN) { 707 logerror("klog"); 708 fklog = -1; 709 } 710 break; 711 } 712 713 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 714 *q = '\0'; 715 printsys(p); 716 } 717 len = strlen(p); 718 if (len >= MAXLINE - 1) { 719 printsys(p); 720 len = 0; 721 } 722 if (len > 0) 723 memmove(line, p, len + 1); 724 } 725 if (len > 0) 726 printsys(line); 727 } 728 729 /* 730 * Take a raw input line from /dev/klog, format similar to syslog(). 731 */ 732 static void 733 printsys(char *p) 734 { 735 int pri, flags; 736 737 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 738 pri = DEFSPRI; 739 if (*p == '<') { 740 pri = 0; 741 while (isdigit(*++p)) 742 pri = 10 * pri + (*p - '0'); 743 if (*p == '>') 744 ++p; 745 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 746 flags |= IGN_CONS; 747 } else { 748 /* kernel printf's come out on console */ 749 flags |= IGN_CONS; 750 } 751 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 752 pri = DEFSPRI; 753 logmsg(pri, p, LocalHostName, flags); 754 } 755 756 static time_t now; 757 758 /* 759 * Log a message to the appropriate log files, users, etc. based on 760 * the priority. 761 */ 762 static void 763 logmsg(int pri, const char *msg, const char *from, int flags) 764 { 765 struct filed *f; 766 int i, fac, msglen, omask, prilev; 767 const char *timestamp; 768 char prog[NAME_MAX+1]; 769 char buf[MAXLINE+1]; 770 771 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 772 pri, flags, from, msg); 773 774 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 775 776 /* 777 * Check to see if msg looks non-standard. 778 */ 779 msglen = strlen(msg); 780 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 781 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 782 flags |= ADDDATE; 783 784 (void)time(&now); 785 if (flags & ADDDATE) { 786 timestamp = ctime(&now) + 4; 787 } else { 788 timestamp = msg; 789 msg += 16; 790 msglen -= 16; 791 } 792 793 /* skip leading blanks */ 794 while (isspace(*msg)) { 795 msg++; 796 msglen--; 797 } 798 799 /* extract facility and priority level */ 800 if (flags & MARK) 801 fac = LOG_NFACILITIES; 802 else 803 fac = LOG_FAC(pri); 804 prilev = LOG_PRI(pri); 805 806 /* extract program name */ 807 for (i = 0; i < NAME_MAX; i++) { 808 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[') 809 break; 810 prog[i] = msg[i]; 811 } 812 prog[i] = 0; 813 814 /* add kernel prefix for kernel messages */ 815 if (flags & ISKERNEL) { 816 snprintf(buf, sizeof(buf), "%s: %s", 817 use_bootfile ? bootfile : "kernel", msg); 818 msg = buf; 819 msglen = strlen(buf); 820 } 821 822 /* log the message to the particular outputs */ 823 if (!Initialized) { 824 f = &consfile; 825 f->f_file = open(ctty, O_WRONLY, 0); 826 827 if (f->f_file >= 0) { 828 fprintlog(f, flags, msg); 829 (void)close(f->f_file); 830 } 831 (void)sigsetmask(omask); 832 return; 833 } 834 for (f = Files; f; f = f->f_next) { 835 /* skip messages that are incorrect priority */ 836 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 837 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 838 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 839 ) 840 || f->f_pmask[fac] == INTERNAL_NOPRI) 841 continue; 842 /* skip messages with the incorrect hostname */ 843 if (f->f_host) 844 switch (f->f_host[0]) { 845 case '+': 846 if (strcmp(from, f->f_host + 1) != 0) 847 continue; 848 break; 849 case '-': 850 if (strcmp(from, f->f_host + 1) == 0) 851 continue; 852 break; 853 } 854 855 /* skip messages with the incorrect program name */ 856 if (f->f_program) 857 switch (f->f_program[0]) { 858 case '+': 859 if (strcmp(prog, f->f_program + 1) != 0) 860 continue; 861 break; 862 case '-': 863 if (strcmp(prog, f->f_program + 1) == 0) 864 continue; 865 break; 866 default: 867 if (strcmp(prog, f->f_program) != 0) 868 continue; 869 break; 870 } 871 872 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 873 continue; 874 875 /* don't output marks to recently written files */ 876 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 877 continue; 878 879 /* 880 * suppress duplicate lines to this file 881 */ 882 if (no_compress - (f->f_type != F_PIPE) < 1 && 883 (flags & MARK) == 0 && msglen == f->f_prevlen && 884 !strcmp(msg, f->f_prevline) && 885 !strcasecmp(from, f->f_prevhost)) { 886 (void)strlcpy(f->f_lasttime, timestamp, 16); 887 f->f_prevcount++; 888 dprintf("msg repeated %d times, %ld sec of %d\n", 889 f->f_prevcount, (long)(now - f->f_time), 890 repeatinterval[f->f_repeatcount]); 891 /* 892 * If domark would have logged this by now, 893 * flush it now (so we don't hold isolated messages), 894 * but back off so we'll flush less often 895 * in the future. 896 */ 897 if (now > REPEATTIME(f)) { 898 fprintlog(f, flags, (char *)NULL); 899 BACKOFF(f); 900 } 901 } else { 902 /* new line, save it */ 903 if (f->f_prevcount) 904 fprintlog(f, 0, (char *)NULL); 905 f->f_repeatcount = 0; 906 f->f_prevpri = pri; 907 (void)strlcpy(f->f_lasttime, timestamp, 16); 908 (void)strlcpy(f->f_prevhost, from, 909 sizeof(f->f_prevhost)); 910 if (msglen < MAXSVLINE) { 911 f->f_prevlen = msglen; 912 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 913 fprintlog(f, flags, (char *)NULL); 914 } else { 915 f->f_prevline[0] = 0; 916 f->f_prevlen = 0; 917 fprintlog(f, flags, msg); 918 } 919 } 920 } 921 (void)sigsetmask(omask); 922 } 923 924 static void 925 fprintlog(struct filed *f, int flags, const char *msg) 926 { 927 struct iovec iov[7]; 928 struct iovec *v; 929 struct addrinfo *r; 930 int i, l, lsent = 0; 931 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 932 const char *msgret; 933 934 v = iov; 935 if (f->f_type == F_WALL) { 936 v->iov_base = greetings; 937 v->iov_len = snprintf(greetings, sizeof greetings, 938 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 939 f->f_prevhost, ctime(&now)); 940 if (v->iov_len > 0) 941 v++; 942 v->iov_base = ""; 943 v->iov_len = 0; 944 v++; 945 } else { 946 v->iov_base = f->f_lasttime; 947 v->iov_len = 15; 948 v++; 949 v->iov_base = " "; 950 v->iov_len = 1; 951 v++; 952 } 953 954 if (LogFacPri) { 955 static char fp_buf[30]; /* Hollow laugh */ 956 int fac = f->f_prevpri & LOG_FACMASK; 957 int pri = LOG_PRI(f->f_prevpri); 958 const char *f_s = NULL; 959 char f_n[5]; /* Hollow laugh */ 960 const char *p_s = NULL; 961 char p_n[5]; /* Hollow laugh */ 962 963 if (LogFacPri > 1) { 964 CODE *c; 965 966 for (c = facilitynames; c->c_name; c++) { 967 if (c->c_val == fac) { 968 f_s = c->c_name; 969 break; 970 } 971 } 972 for (c = prioritynames; c->c_name; c++) { 973 if (c->c_val == pri) { 974 p_s = c->c_name; 975 break; 976 } 977 } 978 } 979 if (!f_s) { 980 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 981 f_s = f_n; 982 } 983 if (!p_s) { 984 snprintf(p_n, sizeof p_n, "%d", pri); 985 p_s = p_n; 986 } 987 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 988 v->iov_base = fp_buf; 989 v->iov_len = strlen(fp_buf); 990 } else { 991 v->iov_base=""; 992 v->iov_len = 0; 993 } 994 v++; 995 996 v->iov_base = f->f_prevhost; 997 v->iov_len = strlen(v->iov_base); 998 v++; 999 v->iov_base = " "; 1000 v->iov_len = 1; 1001 v++; 1002 1003 if (msg) { 1004 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1005 if (wmsg == NULL) { 1006 logerror("strdup"); 1007 exit(1); 1008 } 1009 v->iov_base = wmsg; 1010 v->iov_len = strlen(msg); 1011 } else if (f->f_prevcount > 1) { 1012 v->iov_base = repbuf; 1013 v->iov_len = snprintf(repbuf, sizeof repbuf, 1014 "last message repeated %d times", f->f_prevcount); 1015 } else { 1016 v->iov_base = f->f_prevline; 1017 v->iov_len = f->f_prevlen; 1018 } 1019 v++; 1020 1021 dprintf("Logging to %s", TypeNames[f->f_type]); 1022 f->f_time = now; 1023 1024 switch (f->f_type) { 1025 case F_UNUSED: 1026 dprintf("\n"); 1027 break; 1028 1029 case F_FORW: 1030 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1031 /* check for local vs remote messages */ 1032 if (strcasecmp(f->f_prevhost, LocalHostName)) 1033 l = snprintf(line, sizeof line - 1, 1034 "<%d>%.15s Forwarded from %s: %s", 1035 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1036 iov[5].iov_base); 1037 else 1038 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1039 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1040 if (l < 0) 1041 l = 0; 1042 else if (l > MAXLINE) 1043 l = MAXLINE; 1044 1045 if (finet) { 1046 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1047 for (i = 0; i < *finet; i++) { 1048 #if 0 1049 /* 1050 * should we check AF first, or just 1051 * trial and error? FWD 1052 */ 1053 if (r->ai_family == 1054 address_family_of(finet[i+1])) 1055 #endif 1056 lsent = sendto(finet[i+1], line, l, 0, 1057 r->ai_addr, r->ai_addrlen); 1058 if (lsent == l) 1059 break; 1060 } 1061 if (lsent == l && !send_to_all) 1062 break; 1063 } 1064 dprintf("lsent/l: %d/%d\n", lsent, l); 1065 if (lsent != l) { 1066 int e = errno; 1067 logerror("sendto"); 1068 errno = e; 1069 switch (errno) { 1070 case EHOSTUNREACH: 1071 case EHOSTDOWN: 1072 break; 1073 /* case EBADF: */ 1074 /* case EACCES: */ 1075 /* case ENOTSOCK: */ 1076 /* case EFAULT: */ 1077 /* case EMSGSIZE: */ 1078 /* case EAGAIN: */ 1079 /* case ENOBUFS: */ 1080 /* case ECONNREFUSED: */ 1081 default: 1082 dprintf("removing entry\n", e); 1083 (void)close(f->f_file); 1084 f->f_type = F_UNUSED; 1085 break; 1086 } 1087 } 1088 } 1089 break; 1090 1091 case F_FILE: 1092 dprintf(" %s\n", f->f_un.f_fname); 1093 v->iov_base = "\n"; 1094 v->iov_len = 1; 1095 if (writev(f->f_file, iov, 7) < 0) { 1096 int e = errno; 1097 (void)close(f->f_file); 1098 f->f_type = F_UNUSED; 1099 errno = e; 1100 logerror(f->f_un.f_fname); 1101 } else if (flags & SYNC_FILE) 1102 (void)fsync(f->f_file); 1103 break; 1104 1105 case F_PIPE: 1106 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1107 v->iov_base = "\n"; 1108 v->iov_len = 1; 1109 if (f->f_un.f_pipe.f_pid == 0) { 1110 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1111 &f->f_un.f_pipe.f_pid)) < 0) { 1112 f->f_type = F_UNUSED; 1113 logerror(f->f_un.f_pipe.f_pname); 1114 break; 1115 } 1116 } 1117 if (writev(f->f_file, iov, 7) < 0) { 1118 int e = errno; 1119 (void)close(f->f_file); 1120 if (f->f_un.f_pipe.f_pid > 0) 1121 deadq_enter(f->f_un.f_pipe.f_pid, 1122 f->f_un.f_pipe.f_pname); 1123 f->f_un.f_pipe.f_pid = 0; 1124 errno = e; 1125 logerror(f->f_un.f_pipe.f_pname); 1126 } 1127 break; 1128 1129 case F_CONSOLE: 1130 if (flags & IGN_CONS) { 1131 dprintf(" (ignored)\n"); 1132 break; 1133 } 1134 /* FALLTHROUGH */ 1135 1136 case F_TTY: 1137 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1138 v->iov_base = "\r\n"; 1139 v->iov_len = 2; 1140 1141 errno = 0; /* ttymsg() only sometimes returns an errno */ 1142 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1143 f->f_type = F_UNUSED; 1144 logerror(msgret); 1145 } 1146 break; 1147 1148 case F_USERS: 1149 case F_WALL: 1150 dprintf("\n"); 1151 v->iov_base = "\r\n"; 1152 v->iov_len = 2; 1153 wallmsg(f, iov); 1154 break; 1155 } 1156 f->f_prevcount = 0; 1157 if (msg) 1158 free(wmsg); 1159 } 1160 1161 /* 1162 * WALLMSG -- Write a message to the world at large 1163 * 1164 * Write the specified message to either the entire 1165 * world, or a list of approved users. 1166 */ 1167 static void 1168 wallmsg(struct filed *f, struct iovec *iov) 1169 { 1170 static int reenter; /* avoid calling ourselves */ 1171 FILE *uf; 1172 struct utmp ut; 1173 int i; 1174 const char *p; 1175 char line[sizeof(ut.ut_line) + 1]; 1176 1177 if (reenter++) 1178 return; 1179 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1180 logerror(_PATH_UTMP); 1181 reenter = 0; 1182 return; 1183 } 1184 /* NOSTRICT */ 1185 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1186 if (ut.ut_name[0] == '\0') 1187 continue; 1188 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1189 if (f->f_type == F_WALL) { 1190 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1191 errno = 0; /* already in msg */ 1192 logerror(p); 1193 } 1194 continue; 1195 } 1196 /* should we send the message to this user? */ 1197 for (i = 0; i < MAXUNAMES; i++) { 1198 if (!f->f_un.f_uname[i][0]) 1199 break; 1200 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1201 UT_NAMESIZE)) { 1202 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1203 != NULL) { 1204 errno = 0; /* already in msg */ 1205 logerror(p); 1206 } 1207 break; 1208 } 1209 } 1210 } 1211 (void)fclose(uf); 1212 reenter = 0; 1213 } 1214 1215 static void 1216 reapchild(int signo __unused) 1217 { 1218 int status; 1219 pid_t pid; 1220 struct filed *f; 1221 1222 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1223 if (!Initialized) 1224 /* Don't tell while we are initting. */ 1225 continue; 1226 1227 /* First, look if it's a process from the dead queue. */ 1228 if (deadq_remove(pid)) 1229 goto oncemore; 1230 1231 /* Now, look in list of active processes. */ 1232 for (f = Files; f; f = f->f_next) 1233 if (f->f_type == F_PIPE && 1234 f->f_un.f_pipe.f_pid == pid) { 1235 (void)close(f->f_file); 1236 f->f_un.f_pipe.f_pid = 0; 1237 log_deadchild(pid, status, 1238 f->f_un.f_pipe.f_pname); 1239 break; 1240 } 1241 oncemore: 1242 continue; 1243 } 1244 } 1245 1246 /* 1247 * Return a printable representation of a host address. 1248 */ 1249 static const char * 1250 cvthname(struct sockaddr *f) 1251 { 1252 int error; 1253 sigset_t omask, nmask; 1254 char *p; 1255 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1256 1257 error = getnameinfo((struct sockaddr *)f, 1258 ((struct sockaddr *)f)->sa_len, 1259 ip, sizeof ip, NULL, 0, 1260 NI_NUMERICHOST | withscopeid); 1261 dprintf("cvthname(%s)\n", ip); 1262 1263 if (error) { 1264 dprintf("Malformed from address %s\n", gai_strerror(error)); 1265 return ("???"); 1266 } 1267 if (!resolve) 1268 return (ip); 1269 1270 sigemptyset(&nmask); 1271 sigaddset(&nmask, SIGHUP); 1272 sigprocmask(SIG_BLOCK, &nmask, &omask); 1273 error = getnameinfo((struct sockaddr *)f, 1274 ((struct sockaddr *)f)->sa_len, 1275 hname, sizeof hname, NULL, 0, 1276 NI_NAMEREQD | withscopeid); 1277 sigprocmask(SIG_SETMASK, &omask, NULL); 1278 if (error) { 1279 dprintf("Host name for your address (%s) unknown\n", ip); 1280 return (ip); 1281 } 1282 /* XXX Not quite correct, but close enough for government work. */ 1283 if ((p = strchr(hname, '.')) && strcasecmp(p + 1, LocalDomain) == 0) 1284 *p = '\0'; 1285 return (hname); 1286 } 1287 1288 static void 1289 dodie(int signo) 1290 { 1291 1292 WantDie = signo; 1293 } 1294 1295 static void 1296 domark(int signo __unused) 1297 { 1298 1299 MarkSet = 1; 1300 } 1301 1302 /* 1303 * Print syslogd errors some place. 1304 */ 1305 static void 1306 logerror(const char *type) 1307 { 1308 char buf[512]; 1309 1310 if (errno) 1311 (void)snprintf(buf, 1312 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1313 else 1314 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1315 errno = 0; 1316 dprintf("%s\n", buf); 1317 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1318 } 1319 1320 static void 1321 die(int signo) 1322 { 1323 struct filed *f; 1324 int was_initialized; 1325 char buf[100]; 1326 int i; 1327 1328 was_initialized = Initialized; 1329 Initialized = 0; /* Don't log SIGCHLDs. */ 1330 for (f = Files; f != NULL; f = f->f_next) { 1331 /* flush any pending output */ 1332 if (f->f_prevcount) 1333 fprintlog(f, 0, (char *)NULL); 1334 if (f->f_type == F_PIPE) 1335 (void)close(f->f_file); 1336 } 1337 Initialized = was_initialized; 1338 if (signo) { 1339 dprintf("syslogd: exiting on signal %d\n", signo); 1340 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1341 errno = 0; 1342 logerror(buf); 1343 } 1344 for (i = 0; i < nfunix; i++) 1345 if (funixn[i] && funix[i] != -1) 1346 (void)unlink(funixn[i]); 1347 exit(1); 1348 } 1349 1350 /* 1351 * INIT -- Initialize syslogd from configuration table 1352 */ 1353 static void 1354 init(int signo) 1355 { 1356 int i; 1357 FILE *cf; 1358 struct filed *f, *next, **nextp; 1359 char *p; 1360 char cline[LINE_MAX]; 1361 char prog[NAME_MAX+1]; 1362 char host[MAXHOSTNAMELEN]; 1363 char oldLocalHostName[MAXHOSTNAMELEN]; 1364 char hostMsg[2*MAXHOSTNAMELEN+40]; 1365 char bootfileMsg[LINE_MAX]; 1366 1367 dprintf("init\n"); 1368 1369 /* 1370 * Load hostname (may have changed). 1371 */ 1372 if (signo != 0) 1373 (void)strlcpy(oldLocalHostName, LocalHostName, 1374 sizeof(oldLocalHostName)); 1375 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1376 err(EX_OSERR, "gethostname() failed"); 1377 if ((p = strchr(LocalHostName, '.')) != NULL) { 1378 *p++ = '\0'; 1379 LocalDomain = p; 1380 } else { 1381 LocalDomain = ""; 1382 } 1383 1384 /* 1385 * Close all open log files. 1386 */ 1387 Initialized = 0; 1388 for (f = Files; f != NULL; f = next) { 1389 /* flush any pending output */ 1390 if (f->f_prevcount) 1391 fprintlog(f, 0, (char *)NULL); 1392 1393 switch (f->f_type) { 1394 case F_FILE: 1395 case F_FORW: 1396 case F_CONSOLE: 1397 case F_TTY: 1398 (void)close(f->f_file); 1399 break; 1400 case F_PIPE: 1401 (void)close(f->f_file); 1402 if (f->f_un.f_pipe.f_pid > 0) 1403 deadq_enter(f->f_un.f_pipe.f_pid, 1404 f->f_un.f_pipe.f_pname); 1405 f->f_un.f_pipe.f_pid = 0; 1406 break; 1407 } 1408 next = f->f_next; 1409 if (f->f_program) free(f->f_program); 1410 if (f->f_host) free(f->f_host); 1411 free((char *)f); 1412 } 1413 Files = NULL; 1414 nextp = &Files; 1415 1416 /* open the configuration file */ 1417 if ((cf = fopen(ConfFile, "r")) == NULL) { 1418 dprintf("cannot open %s\n", ConfFile); 1419 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1420 if (*nextp == NULL) { 1421 logerror("calloc"); 1422 exit(1); 1423 } 1424 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1425 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1426 if ((*nextp)->f_next == NULL) { 1427 logerror("calloc"); 1428 exit(1); 1429 } 1430 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1431 Initialized = 1; 1432 return; 1433 } 1434 1435 /* 1436 * Foreach line in the conf table, open that file. 1437 */ 1438 f = NULL; 1439 (void)strlcpy(host, "*", sizeof(host)); 1440 (void)strlcpy(prog, "*", sizeof(prog)); 1441 while (fgets(cline, sizeof(cline), cf) != NULL) { 1442 /* 1443 * check for end-of-section, comments, strip off trailing 1444 * spaces and newline character. #!prog is treated specially: 1445 * following lines apply only to that program. 1446 */ 1447 for (p = cline; isspace(*p); ++p) 1448 continue; 1449 if (*p == 0) 1450 continue; 1451 if (*p == '#') { 1452 p++; 1453 if (*p != '!' && *p != '+' && *p != '-') 1454 continue; 1455 } 1456 if (*p == '+' || *p == '-') { 1457 host[0] = *p++; 1458 while (isspace(*p)) 1459 p++; 1460 if ((!*p) || (*p == '*')) { 1461 (void)strlcpy(host, "*", sizeof(host)); 1462 continue; 1463 } 1464 if (*p == '@') 1465 p = LocalHostName; 1466 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1467 if (!isalnum(*p) && *p != '.' && *p != '-') 1468 break; 1469 host[i] = *p++; 1470 } 1471 host[i] = '\0'; 1472 continue; 1473 } 1474 if (*p == '!') { 1475 p++; 1476 while (isspace(*p)) p++; 1477 if ((!*p) || (*p == '*')) { 1478 (void)strlcpy(prog, "*", sizeof(prog)); 1479 continue; 1480 } 1481 for (i = 0; i < NAME_MAX; i++) { 1482 if (!isprint(p[i])) 1483 break; 1484 prog[i] = p[i]; 1485 } 1486 prog[i] = 0; 1487 continue; 1488 } 1489 for (p = strchr(cline, '\0'); isspace(*--p);) 1490 continue; 1491 *++p = '\0'; 1492 f = (struct filed *)calloc(1, sizeof(*f)); 1493 if (f == NULL) { 1494 logerror("calloc"); 1495 exit(1); 1496 } 1497 *nextp = f; 1498 nextp = &f->f_next; 1499 cfline(cline, f, prog, host); 1500 } 1501 1502 /* close the configuration file */ 1503 (void)fclose(cf); 1504 1505 Initialized = 1; 1506 1507 if (Debug) { 1508 for (f = Files; f; f = f->f_next) { 1509 for (i = 0; i <= LOG_NFACILITIES; i++) 1510 if (f->f_pmask[i] == INTERNAL_NOPRI) 1511 printf("X "); 1512 else 1513 printf("%d ", f->f_pmask[i]); 1514 printf("%s: ", TypeNames[f->f_type]); 1515 switch (f->f_type) { 1516 case F_FILE: 1517 printf("%s", f->f_un.f_fname); 1518 break; 1519 1520 case F_CONSOLE: 1521 case F_TTY: 1522 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1523 break; 1524 1525 case F_FORW: 1526 printf("%s", f->f_un.f_forw.f_hname); 1527 break; 1528 1529 case F_PIPE: 1530 printf("%s", f->f_un.f_pipe.f_pname); 1531 break; 1532 1533 case F_USERS: 1534 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1535 printf("%s, ", f->f_un.f_uname[i]); 1536 break; 1537 } 1538 if (f->f_program) 1539 printf(" (%s)", f->f_program); 1540 printf("\n"); 1541 } 1542 } 1543 1544 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1545 dprintf("syslogd: restarted\n"); 1546 /* 1547 * Log a change in hostname, but only on a restart. 1548 */ 1549 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1550 (void)snprintf(hostMsg, sizeof(hostMsg), 1551 "syslogd: hostname changed, \"%s\" to \"%s\"", 1552 oldLocalHostName, LocalHostName); 1553 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1554 dprintf("%s\n", hostMsg); 1555 } 1556 /* 1557 * Log the kernel boot file if we aren't going to use it as 1558 * the prefix, and if this is *not* a restart. 1559 */ 1560 if (signo == 0 && !use_bootfile) { 1561 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1562 "syslogd: kernel boot file is %s", bootfile); 1563 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1564 dprintf("%s\n", bootfileMsg); 1565 } 1566 } 1567 1568 /* 1569 * Crack a configuration file line 1570 */ 1571 static void 1572 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1573 { 1574 struct addrinfo hints, *res; 1575 int error, i, pri; 1576 const char *p, *q; 1577 char *bp; 1578 char buf[MAXLINE], ebuf[100]; 1579 1580 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1581 1582 errno = 0; /* keep strerror() stuff out of logerror messages */ 1583 1584 /* clear out file entry */ 1585 memset(f, 0, sizeof(*f)); 1586 for (i = 0; i <= LOG_NFACILITIES; i++) 1587 f->f_pmask[i] = INTERNAL_NOPRI; 1588 1589 /* save hostname if any */ 1590 if (host && *host == '*') 1591 host = NULL; 1592 if (host) { 1593 int hl, dl; 1594 1595 f->f_host = strdup(host); 1596 if (f->f_host == NULL) { 1597 logerror("strdup"); 1598 exit(1); 1599 } 1600 hl = strlen(f->f_host); 1601 if (f->f_host[hl-1] == '.') 1602 f->f_host[--hl] = '\0'; 1603 dl = strlen(LocalDomain) + 1; 1604 if (hl > dl && f->f_host[hl-dl] == '.' && 1605 strcasecmp(f->f_host + hl - dl + 1, LocalDomain) == 0) 1606 f->f_host[hl-dl] = '\0'; 1607 } 1608 1609 /* save program name if any */ 1610 if (prog && *prog == '*') 1611 prog = NULL; 1612 if (prog) { 1613 f->f_program = strdup(prog); 1614 if (f->f_program == NULL) { 1615 logerror("strdup"); 1616 exit(1); 1617 } 1618 } 1619 1620 /* scan through the list of selectors */ 1621 for (p = line; *p && *p != '\t' && *p != ' ';) { 1622 int pri_done; 1623 int pri_cmp; 1624 int pri_invert; 1625 1626 /* find the end of this facility name list */ 1627 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1628 continue; 1629 1630 /* get the priority comparison */ 1631 pri_cmp = 0; 1632 pri_done = 0; 1633 pri_invert = 0; 1634 if (*q == '!') { 1635 pri_invert = 1; 1636 q++; 1637 } 1638 while (!pri_done) { 1639 switch (*q) { 1640 case '<': 1641 pri_cmp |= PRI_LT; 1642 q++; 1643 break; 1644 case '=': 1645 pri_cmp |= PRI_EQ; 1646 q++; 1647 break; 1648 case '>': 1649 pri_cmp |= PRI_GT; 1650 q++; 1651 break; 1652 default: 1653 pri_done++; 1654 break; 1655 } 1656 } 1657 1658 /* collect priority name */ 1659 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1660 *bp++ = *q++; 1661 *bp = '\0'; 1662 1663 /* skip cruft */ 1664 while (strchr(",;", *q)) 1665 q++; 1666 1667 /* decode priority name */ 1668 if (*buf == '*') { 1669 pri = LOG_PRIMASK + 1; 1670 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1671 } else { 1672 pri = decode(buf, prioritynames); 1673 if (pri < 0) { 1674 (void)snprintf(ebuf, sizeof ebuf, 1675 "unknown priority name \"%s\"", buf); 1676 logerror(ebuf); 1677 return; 1678 } 1679 } 1680 if (!pri_cmp) 1681 pri_cmp = (UniquePriority) 1682 ? (PRI_EQ) 1683 : (PRI_EQ | PRI_GT) 1684 ; 1685 if (pri_invert) 1686 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1687 1688 /* scan facilities */ 1689 while (*p && !strchr("\t.; ", *p)) { 1690 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1691 *bp++ = *p++; 1692 *bp = '\0'; 1693 1694 if (*buf == '*') { 1695 for (i = 0; i < LOG_NFACILITIES; i++) { 1696 f->f_pmask[i] = pri; 1697 f->f_pcmp[i] = pri_cmp; 1698 } 1699 } else { 1700 i = decode(buf, facilitynames); 1701 if (i < 0) { 1702 (void)snprintf(ebuf, sizeof ebuf, 1703 "unknown facility name \"%s\"", 1704 buf); 1705 logerror(ebuf); 1706 return; 1707 } 1708 f->f_pmask[i >> 3] = pri; 1709 f->f_pcmp[i >> 3] = pri_cmp; 1710 } 1711 while (*p == ',' || *p == ' ') 1712 p++; 1713 } 1714 1715 p = q; 1716 } 1717 1718 /* skip to action part */ 1719 while (*p == '\t' || *p == ' ') 1720 p++; 1721 1722 switch (*p) { 1723 case '@': 1724 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1725 sizeof(f->f_un.f_forw.f_hname)); 1726 memset(&hints, 0, sizeof(hints)); 1727 hints.ai_family = family; 1728 hints.ai_socktype = SOCK_DGRAM; 1729 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1730 &res); 1731 if (error) { 1732 logerror(gai_strerror(error)); 1733 break; 1734 } 1735 f->f_un.f_forw.f_addr = res; 1736 f->f_type = F_FORW; 1737 break; 1738 1739 case '/': 1740 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1741 f->f_type = F_UNUSED; 1742 logerror(p); 1743 break; 1744 } 1745 if (isatty(f->f_file)) { 1746 if (strcmp(p, ctty) == 0) 1747 f->f_type = F_CONSOLE; 1748 else 1749 f->f_type = F_TTY; 1750 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1751 sizeof(f->f_un.f_fname)); 1752 } else { 1753 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1754 f->f_type = F_FILE; 1755 } 1756 break; 1757 1758 case '|': 1759 f->f_un.f_pipe.f_pid = 0; 1760 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1761 f->f_type = F_PIPE; 1762 break; 1763 1764 case '*': 1765 f->f_type = F_WALL; 1766 break; 1767 1768 default: 1769 for (i = 0; i < MAXUNAMES && *p; i++) { 1770 for (q = p; *q && *q != ','; ) 1771 q++; 1772 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1773 if ((q - p) > UT_NAMESIZE) 1774 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1775 else 1776 f->f_un.f_uname[i][q - p] = '\0'; 1777 while (*q == ',' || *q == ' ') 1778 q++; 1779 p = q; 1780 } 1781 f->f_type = F_USERS; 1782 break; 1783 } 1784 } 1785 1786 1787 /* 1788 * Decode a symbolic name to a numeric value 1789 */ 1790 static int 1791 decode(const char *name, CODE *codetab) 1792 { 1793 CODE *c; 1794 char *p, buf[40]; 1795 1796 if (isdigit(*name)) 1797 return (atoi(name)); 1798 1799 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1800 if (isupper(*name)) 1801 *p = tolower(*name); 1802 else 1803 *p = *name; 1804 } 1805 *p = '\0'; 1806 for (c = codetab; c->c_name; c++) 1807 if (!strcmp(buf, c->c_name)) 1808 return (c->c_val); 1809 1810 return (-1); 1811 } 1812 1813 static void 1814 markit(void) 1815 { 1816 struct filed *f; 1817 dq_t q, next; 1818 1819 now = time((time_t *)NULL); 1820 MarkSeq += TIMERINTVL; 1821 if (MarkSeq >= MarkInterval) { 1822 logmsg(LOG_INFO, "-- MARK --", 1823 LocalHostName, ADDDATE|MARK); 1824 MarkSeq = 0; 1825 } 1826 1827 for (f = Files; f; f = f->f_next) { 1828 if (f->f_prevcount && now >= REPEATTIME(f)) { 1829 dprintf("flush %s: repeated %d times, %d sec.\n", 1830 TypeNames[f->f_type], f->f_prevcount, 1831 repeatinterval[f->f_repeatcount]); 1832 fprintlog(f, 0, (char *)NULL); 1833 BACKOFF(f); 1834 } 1835 } 1836 1837 /* Walk the dead queue, and see if we should signal somebody. */ 1838 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1839 next = TAILQ_NEXT(q, dq_entries); 1840 1841 switch (q->dq_timeout) { 1842 case 0: 1843 /* Already signalled once, try harder now. */ 1844 if (kill(q->dq_pid, SIGKILL) != 0) 1845 (void)deadq_remove(q->dq_pid); 1846 break; 1847 1848 case 1: 1849 /* 1850 * Timed out on dead queue, send terminate 1851 * signal. Note that we leave the removal 1852 * from the dead queue to reapchild(), which 1853 * will also log the event (unless the process 1854 * didn't even really exist, in case we simply 1855 * drop it from the dead queue). 1856 */ 1857 if (kill(q->dq_pid, SIGTERM) != 0) 1858 (void)deadq_remove(q->dq_pid); 1859 /* FALLTHROUGH */ 1860 1861 default: 1862 q->dq_timeout--; 1863 } 1864 } 1865 MarkSet = 0; 1866 (void)alarm(TIMERINTVL); 1867 } 1868 1869 /* 1870 * fork off and become a daemon, but wait for the child to come online 1871 * before returing to the parent, or we get disk thrashing at boot etc. 1872 * Set a timer so we don't hang forever if it wedges. 1873 */ 1874 static int 1875 waitdaemon(int nochdir, int noclose, int maxwait) 1876 { 1877 int fd; 1878 int status; 1879 pid_t pid, childpid; 1880 1881 switch (childpid = fork()) { 1882 case -1: 1883 return (-1); 1884 case 0: 1885 break; 1886 default: 1887 signal(SIGALRM, timedout); 1888 alarm(maxwait); 1889 while ((pid = wait3(&status, 0, NULL)) != -1) { 1890 if (WIFEXITED(status)) 1891 errx(1, "child pid %d exited with return code %d", 1892 pid, WEXITSTATUS(status)); 1893 if (WIFSIGNALED(status)) 1894 errx(1, "child pid %d exited on signal %d%s", 1895 pid, WTERMSIG(status), 1896 WCOREDUMP(status) ? " (core dumped)" : 1897 ""); 1898 if (pid == childpid) /* it's gone... */ 1899 break; 1900 } 1901 exit(0); 1902 } 1903 1904 if (setsid() == -1) 1905 return (-1); 1906 1907 if (!nochdir) 1908 (void)chdir("/"); 1909 1910 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1911 (void)dup2(fd, STDIN_FILENO); 1912 (void)dup2(fd, STDOUT_FILENO); 1913 (void)dup2(fd, STDERR_FILENO); 1914 if (fd > 2) 1915 (void)close (fd); 1916 } 1917 return (getppid()); 1918 } 1919 1920 /* 1921 * We get a SIGALRM from the child when it's running and finished doing it's 1922 * fsync()'s or O_SYNC writes for all the boot messages. 1923 * 1924 * We also get a signal from the kernel if the timer expires, so check to 1925 * see what happened. 1926 */ 1927 static void 1928 timedout(int sig __unused) 1929 { 1930 int left; 1931 left = alarm(0); 1932 signal(SIGALRM, SIG_DFL); 1933 if (left == 0) 1934 errx(1, "timed out waiting for child"); 1935 else 1936 _exit(0); 1937 } 1938 1939 /* 1940 * Add `s' to the list of allowable peer addresses to accept messages 1941 * from. 1942 * 1943 * `s' is a string in the form: 1944 * 1945 * [*]domainname[:{servicename|portnumber|*}] 1946 * 1947 * or 1948 * 1949 * netaddr/maskbits[:{servicename|portnumber|*}] 1950 * 1951 * Returns -1 on error, 0 if the argument was valid. 1952 */ 1953 static int 1954 allowaddr(char *s) 1955 { 1956 char *cp1, *cp2; 1957 struct allowedpeer ap; 1958 struct servent *se; 1959 int masklen = -1, i; 1960 struct addrinfo hints, *res; 1961 struct in_addr *addrp, *maskp; 1962 u_int32_t *addr6p, *mask6p; 1963 char ip[NI_MAXHOST]; 1964 1965 #ifdef INET6 1966 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1967 #endif 1968 cp1 = s; 1969 if ((cp1 = strrchr(cp1, ':'))) { 1970 /* service/port provided */ 1971 *cp1++ = '\0'; 1972 if (strlen(cp1) == 1 && *cp1 == '*') 1973 /* any port allowed */ 1974 ap.port = 0; 1975 else if ((se = getservbyname(cp1, "udp"))) { 1976 ap.port = ntohs(se->s_port); 1977 } else { 1978 ap.port = strtol(cp1, &cp2, 0); 1979 if (*cp2 != '\0') 1980 return (-1); /* port not numeric */ 1981 } 1982 } else { 1983 if ((se = getservbyname("syslog", "udp"))) 1984 ap.port = ntohs(se->s_port); 1985 else 1986 /* sanity, should not happen */ 1987 ap.port = 514; 1988 } 1989 1990 if ((cp1 = strchr(s, '/')) != NULL && 1991 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 1992 *cp1 = '\0'; 1993 if ((masklen = atoi(cp1 + 1)) < 0) 1994 return (-1); 1995 } 1996 #ifdef INET6 1997 if (*s == '[') { 1998 cp2 = s + strlen(s) - 1; 1999 if (*cp2 == ']') { 2000 ++s; 2001 *cp2 = '\0'; 2002 } else { 2003 cp2 = NULL; 2004 } 2005 } else { 2006 cp2 = NULL; 2007 } 2008 #endif 2009 memset(&hints, 0, sizeof(hints)); 2010 hints.ai_family = PF_UNSPEC; 2011 hints.ai_socktype = SOCK_DGRAM; 2012 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2013 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2014 ap.isnumeric = 1; 2015 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2016 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2017 ap.a_mask.ss_family = res->ai_family; 2018 if (res->ai_family == AF_INET) { 2019 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2020 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2021 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2022 if (masklen < 0) { 2023 /* use default netmask */ 2024 if (IN_CLASSA(ntohl(addrp->s_addr))) 2025 maskp->s_addr = htonl(IN_CLASSA_NET); 2026 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2027 maskp->s_addr = htonl(IN_CLASSB_NET); 2028 else 2029 maskp->s_addr = htonl(IN_CLASSC_NET); 2030 } else if (masklen <= 32) { 2031 /* convert masklen to netmask */ 2032 if (masklen == 0) 2033 maskp->s_addr = 0; 2034 else 2035 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2036 } else { 2037 freeaddrinfo(res); 2038 return (-1); 2039 } 2040 /* Lose any host bits in the network number. */ 2041 addrp->s_addr &= maskp->s_addr; 2042 } 2043 #ifdef INET6 2044 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2045 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2046 if (masklen < 0) 2047 masklen = 128; 2048 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2049 /* convert masklen to netmask */ 2050 while (masklen > 0) { 2051 if (masklen < 32) { 2052 *mask6p = htonl(~(0xffffffff >> masklen)); 2053 break; 2054 } 2055 *mask6p++ = 0xffffffff; 2056 masklen -= 32; 2057 } 2058 /* Lose any host bits in the network number. */ 2059 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2060 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2061 for (i = 0; i < 4; i++) 2062 addr6p[i] &= mask6p[i]; 2063 } 2064 #endif 2065 else { 2066 freeaddrinfo(res); 2067 return (-1); 2068 } 2069 freeaddrinfo(res); 2070 } else { 2071 /* arg `s' is domain name */ 2072 ap.isnumeric = 0; 2073 ap.a_name = s; 2074 if (cp1) 2075 *cp1 = '/'; 2076 #ifdef INET6 2077 if (cp2) { 2078 *cp2 = ']'; 2079 --s; 2080 } 2081 #endif 2082 } 2083 2084 if (Debug) { 2085 printf("allowaddr: rule %d: ", NumAllowed); 2086 if (ap.isnumeric) { 2087 printf("numeric, "); 2088 getnameinfo((struct sockaddr *)&ap.a_addr, 2089 ((struct sockaddr *)&ap.a_addr)->sa_len, 2090 ip, sizeof ip, NULL, 0, 2091 NI_NUMERICHOST | withscopeid); 2092 printf("addr = %s, ", ip); 2093 getnameinfo((struct sockaddr *)&ap.a_mask, 2094 ((struct sockaddr *)&ap.a_mask)->sa_len, 2095 ip, sizeof ip, NULL, 0, 2096 NI_NUMERICHOST | withscopeid); 2097 printf("mask = %s; ", ip); 2098 } else { 2099 printf("domainname = %s; ", ap.a_name); 2100 } 2101 printf("port = %d\n", ap.port); 2102 } 2103 2104 if ((AllowedPeers = realloc(AllowedPeers, 2105 ++NumAllowed * sizeof(struct allowedpeer))) 2106 == NULL) { 2107 logerror("realloc"); 2108 exit(1); 2109 } 2110 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2111 return (0); 2112 } 2113 2114 /* 2115 * Validate that the remote peer has permission to log to us. 2116 */ 2117 static int 2118 validate(struct sockaddr *sa, const char *hname) 2119 { 2120 int i, j, reject; 2121 size_t l1, l2; 2122 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2123 struct allowedpeer *ap; 2124 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2125 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2126 struct addrinfo hints, *res; 2127 u_short sport; 2128 2129 if (NumAllowed == 0) 2130 /* traditional behaviour, allow everything */ 2131 return (1); 2132 2133 (void)strlcpy(name, hname, sizeof(name)); 2134 memset(&hints, 0, sizeof(hints)); 2135 hints.ai_family = PF_UNSPEC; 2136 hints.ai_socktype = SOCK_DGRAM; 2137 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2138 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2139 freeaddrinfo(res); 2140 else if (strchr(name, '.') == NULL) { 2141 strlcat(name, ".", sizeof name); 2142 strlcat(name, LocalDomain, sizeof name); 2143 } 2144 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2145 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2146 return (0); /* for safety, should not occur */ 2147 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2148 ip, port, name); 2149 sport = atoi(port); 2150 2151 /* now, walk down the list */ 2152 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2153 if (ap->port != 0 && ap->port != sport) { 2154 dprintf("rejected in rule %d due to port mismatch.\n", i); 2155 continue; 2156 } 2157 2158 if (ap->isnumeric) { 2159 if (ap->a_addr.ss_family != sa->sa_family) { 2160 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2161 continue; 2162 } 2163 if (ap->a_addr.ss_family == AF_INET) { 2164 sin4 = (struct sockaddr_in *)sa; 2165 a4p = (struct sockaddr_in *)&ap->a_addr; 2166 m4p = (struct sockaddr_in *)&ap->a_mask; 2167 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2168 != a4p->sin_addr.s_addr) { 2169 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2170 continue; 2171 } 2172 } 2173 #ifdef INET6 2174 else if (ap->a_addr.ss_family == AF_INET6) { 2175 sin6 = (struct sockaddr_in6 *)sa; 2176 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2177 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2178 #ifdef NI_WITHSCOPEID 2179 if (a6p->sin6_scope_id != 0 && 2180 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2181 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2182 continue; 2183 } 2184 #endif 2185 reject = 0; 2186 for (j = 0; j < 16; j += 4) { 2187 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2188 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2189 ++reject; 2190 break; 2191 } 2192 } 2193 if (reject) { 2194 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2195 continue; 2196 } 2197 } 2198 #endif 2199 else 2200 continue; 2201 } else { 2202 cp = ap->a_name; 2203 l1 = strlen(name); 2204 if (*cp == '*') { 2205 /* allow wildmatch */ 2206 cp++; 2207 l2 = strlen(cp); 2208 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2209 dprintf("rejected in rule %d due to name mismatch.\n", i); 2210 continue; 2211 } 2212 } else { 2213 /* exact match */ 2214 l2 = strlen(cp); 2215 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2216 dprintf("rejected in rule %d due to name mismatch.\n", i); 2217 continue; 2218 } 2219 } 2220 } 2221 dprintf("accepted in rule %d.\n", i); 2222 return (1); /* hooray! */ 2223 } 2224 return (0); 2225 } 2226 2227 /* 2228 * Fairly similar to popen(3), but returns an open descriptor, as 2229 * opposed to a FILE *. 2230 */ 2231 static int 2232 p_open(const char *prog, pid_t *pid) 2233 { 2234 int pfd[2], nulldesc, i; 2235 sigset_t omask, mask; 2236 char *argv[4]; /* sh -c cmd NULL */ 2237 char errmsg[200]; 2238 2239 if (pipe(pfd) == -1) 2240 return (-1); 2241 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2242 /* we are royally screwed anyway */ 2243 return (-1); 2244 2245 sigemptyset(&mask); 2246 sigaddset(&mask, SIGALRM); 2247 sigaddset(&mask, SIGHUP); 2248 sigprocmask(SIG_BLOCK, &mask, &omask); 2249 switch ((*pid = fork())) { 2250 case -1: 2251 sigprocmask(SIG_SETMASK, &omask, 0); 2252 close(nulldesc); 2253 return (-1); 2254 2255 case 0: 2256 /* XXX should check for NULL return */ 2257 argv[0] = strdup("sh"); 2258 argv[1] = strdup("-c"); 2259 argv[2] = strdup(prog); 2260 argv[3] = NULL; 2261 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2262 logerror("strdup"); 2263 exit(1); 2264 } 2265 2266 alarm(0); 2267 (void)setsid(); /* Avoid catching SIGHUPs. */ 2268 2269 /* 2270 * Throw away pending signals, and reset signal 2271 * behaviour to standard values. 2272 */ 2273 signal(SIGALRM, SIG_IGN); 2274 signal(SIGHUP, SIG_IGN); 2275 sigprocmask(SIG_SETMASK, &omask, 0); 2276 signal(SIGPIPE, SIG_DFL); 2277 signal(SIGQUIT, SIG_DFL); 2278 signal(SIGALRM, SIG_DFL); 2279 signal(SIGHUP, SIG_DFL); 2280 2281 dup2(pfd[0], STDIN_FILENO); 2282 dup2(nulldesc, STDOUT_FILENO); 2283 dup2(nulldesc, STDERR_FILENO); 2284 for (i = getdtablesize(); i > 2; i--) 2285 (void)close(i); 2286 2287 (void)execvp(_PATH_BSHELL, argv); 2288 _exit(255); 2289 } 2290 2291 sigprocmask(SIG_SETMASK, &omask, 0); 2292 close(nulldesc); 2293 close(pfd[0]); 2294 /* 2295 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2296 * supposed to get an EWOULDBLOCK on writev(2), which is 2297 * caught by the logic above anyway, which will in turn close 2298 * the pipe, and fork a new logging subprocess if necessary. 2299 * The stale subprocess will be killed some time later unless 2300 * it terminated itself due to closing its input pipe (so we 2301 * get rid of really dead puppies). 2302 */ 2303 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2304 /* This is bad. */ 2305 (void)snprintf(errmsg, sizeof errmsg, 2306 "Warning: cannot change pipe to PID %d to " 2307 "non-blocking behaviour.", 2308 (int)*pid); 2309 logerror(errmsg); 2310 } 2311 return (pfd[1]); 2312 } 2313 2314 static void 2315 deadq_enter(pid_t pid, const char *name) 2316 { 2317 dq_t p; 2318 int status; 2319 2320 /* 2321 * Be paranoid, if we can't signal the process, don't enter it 2322 * into the dead queue (perhaps it's already dead). If possible, 2323 * we try to fetch and log the child's status. 2324 */ 2325 if (kill(pid, 0) != 0) { 2326 if (waitpid(pid, &status, WNOHANG) > 0) 2327 log_deadchild(pid, status, name); 2328 return; 2329 } 2330 2331 p = malloc(sizeof(struct deadq_entry)); 2332 if (p == NULL) { 2333 logerror("malloc"); 2334 exit(1); 2335 } 2336 2337 p->dq_pid = pid; 2338 p->dq_timeout = DQ_TIMO_INIT; 2339 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2340 } 2341 2342 static int 2343 deadq_remove(pid_t pid) 2344 { 2345 dq_t q; 2346 2347 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2348 if (q->dq_pid == pid) { 2349 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2350 free(q); 2351 return (1); 2352 } 2353 } 2354 2355 return (0); 2356 } 2357 2358 static void 2359 log_deadchild(pid_t pid, int status, const char *name) 2360 { 2361 int code; 2362 char buf[256]; 2363 const char *reason; 2364 2365 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2366 if (WIFSIGNALED(status)) { 2367 reason = "due to signal"; 2368 code = WTERMSIG(status); 2369 } else { 2370 reason = "with status"; 2371 code = WEXITSTATUS(status); 2372 if (code == 0) 2373 return; 2374 } 2375 (void)snprintf(buf, sizeof buf, 2376 "Logging subprocess %d (%s) exited %s %d.", 2377 pid, name, reason, code); 2378 logerror(buf); 2379 } 2380 2381 static int * 2382 socksetup(int af, const char *bindhostname) 2383 { 2384 struct addrinfo hints, *res, *r; 2385 int error, maxs, *s, *socks; 2386 2387 memset(&hints, 0, sizeof(hints)); 2388 hints.ai_flags = AI_PASSIVE; 2389 hints.ai_family = af; 2390 hints.ai_socktype = SOCK_DGRAM; 2391 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2392 if (error) { 2393 logerror(gai_strerror(error)); 2394 errno = 0; 2395 die(0); 2396 } 2397 2398 /* Count max number of sockets we may open */ 2399 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2400 socks = malloc((maxs+1) * sizeof(int)); 2401 if (socks == NULL) { 2402 logerror("couldn't allocate memory for sockets"); 2403 die(0); 2404 } 2405 2406 *socks = 0; /* num of sockets counter at start of array */ 2407 s = socks + 1; 2408 for (r = res; r; r = r->ai_next) { 2409 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2410 if (*s < 0) { 2411 logerror("socket"); 2412 continue; 2413 } 2414 if (r->ai_family == AF_INET6) { 2415 int on = 1; 2416 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2417 (char *)&on, sizeof (on)) < 0) { 2418 logerror("setsockopt"); 2419 close(*s); 2420 continue; 2421 } 2422 } 2423 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2424 close(*s); 2425 logerror("bind"); 2426 continue; 2427 } 2428 2429 (*socks)++; 2430 s++; 2431 } 2432 2433 if (*socks == 0) { 2434 free(socks); 2435 if (Debug) 2436 return (NULL); 2437 else 2438 die(0); 2439 } 2440 if (res) 2441 freeaddrinfo(res); 2442 2443 return (socks); 2444 } 2445