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 #include <sys/types.h> 94 95 #include <netinet/in.h> 96 #include <netdb.h> 97 #include <arpa/inet.h> 98 99 #include <ctype.h> 100 #include <err.h> 101 #include <errno.h> 102 #include <fcntl.h> 103 #include <libutil.h> 104 #include <limits.h> 105 #include <paths.h> 106 #include <signal.h> 107 #include <stdio.h> 108 #include <stdlib.h> 109 #include <string.h> 110 #include <sysexits.h> 111 #include <unistd.h> 112 #include <utmp.h> 113 114 #include "pathnames.h" 115 #include "ttymsg.h" 116 117 #define SYSLOG_NAMES 118 #include <sys/syslog.h> 119 120 #ifdef NI_WITHSCOPEID 121 static const int withscopeid = NI_WITHSCOPEID; 122 #else 123 static const int withscopeid; 124 #endif 125 126 const char *ConfFile = _PATH_LOGCONF; 127 const char *PidFile = _PATH_LOGPID; 128 const char ctty[] = _PATH_CONSOLE; 129 130 #define dprintf if (Debug) printf 131 132 #define MAXUNAMES 20 /* maximum number of user names */ 133 134 #define MAXFUNIX 20 135 136 int nfunix = 1; 137 const char *funixn[MAXFUNIX] = { _PATH_LOG }; 138 int funix[MAXFUNIX]; 139 140 /* 141 * Flags to logmsg(). 142 */ 143 144 #define IGN_CONS 0x001 /* don't print on console */ 145 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 146 #define ADDDATE 0x004 /* add a date to the message */ 147 #define MARK 0x008 /* this message is a mark */ 148 #define ISKERNEL 0x010 /* kernel generated message */ 149 150 /* 151 * This structure represents the files that will have log 152 * copies printed. 153 */ 154 155 struct filed { 156 struct filed *f_next; /* next in linked list */ 157 short f_type; /* entry type, see below */ 158 short f_file; /* file descriptor */ 159 time_t f_time; /* time this was last written */ 160 char *f_host; /* host from which to recd. */ 161 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 162 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 163 #define PRI_LT 0x1 164 #define PRI_EQ 0x2 165 #define PRI_GT 0x4 166 char *f_program; /* program this applies to */ 167 union { 168 char f_uname[MAXUNAMES][UT_NAMESIZE+1]; 169 struct { 170 char f_hname[MAXHOSTNAMELEN]; 171 struct addrinfo *f_addr; 172 173 } f_forw; /* forwarding address */ 174 char f_fname[MAXPATHLEN]; 175 struct { 176 char f_pname[MAXPATHLEN]; 177 pid_t f_pid; 178 } f_pipe; 179 } f_un; 180 char f_prevline[MAXSVLINE]; /* last message logged */ 181 char f_lasttime[16]; /* time of last occurrence */ 182 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 183 int f_prevpri; /* pri of f_prevline */ 184 int f_prevlen; /* length of f_prevline */ 185 int f_prevcount; /* repetition cnt of prevline */ 186 u_int f_repeatcount; /* number of "repeated" msgs */ 187 }; 188 189 /* 190 * Queue of about-to-be dead processes we should watch out for. 191 */ 192 193 TAILQ_HEAD(stailhead, deadq_entry) deadq_head; 194 struct stailhead *deadq_headp; 195 196 struct deadq_entry { 197 pid_t dq_pid; 198 int dq_timeout; 199 TAILQ_ENTRY(deadq_entry) dq_entries; 200 }; 201 202 /* 203 * The timeout to apply to processes waiting on the dead queue. Unit 204 * of measure is `mark intervals', i.e. 20 minutes by default. 205 * Processes on the dead queue will be terminated after that time. 206 */ 207 208 #define DQ_TIMO_INIT 2 209 210 typedef struct deadq_entry *dq_t; 211 212 213 /* 214 * Struct to hold records of network addresses that are allowed to log 215 * to us. 216 */ 217 struct allowedpeer { 218 int isnumeric; 219 u_short port; 220 union { 221 struct { 222 struct sockaddr_storage addr; 223 struct sockaddr_storage mask; 224 } numeric; 225 char *name; 226 } u; 227 #define a_addr u.numeric.addr 228 #define a_mask u.numeric.mask 229 #define a_name u.name 230 }; 231 232 233 /* 234 * Intervals at which we flush out "message repeated" messages, 235 * in seconds after previous message is logged. After each flush, 236 * we move to the next interval until we reach the largest. 237 */ 238 int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 239 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 240 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 241 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 242 (f)->f_repeatcount = MAXREPEAT; \ 243 } 244 245 /* values for f_type */ 246 #define F_UNUSED 0 /* unused entry */ 247 #define F_FILE 1 /* regular file */ 248 #define F_TTY 2 /* terminal */ 249 #define F_CONSOLE 3 /* console terminal */ 250 #define F_FORW 4 /* remote machine */ 251 #define F_USERS 5 /* list of users */ 252 #define F_WALL 6 /* everyone logged on */ 253 #define F_PIPE 7 /* pipe to program */ 254 255 const char *TypeNames[8] = { 256 "UNUSED", "FILE", "TTY", "CONSOLE", 257 "FORW", "USERS", "WALL", "PIPE" 258 }; 259 260 static struct filed *Files; /* Log files that we write to */ 261 static struct filed consfile; /* Console */ 262 263 static int Debug; /* debug flag */ 264 static int resolve = 1; /* resolve hostname */ 265 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 266 static char *LocalDomain; /* our local domain name */ 267 static int *finet; /* Internet datagram socket */ 268 static int fklog = -1; /* /dev/klog */ 269 static int Initialized; /* set when we have initialized ourselves */ 270 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 271 static int MarkSeq; /* mark sequence number */ 272 static int SecureMode; /* when true, receive only unix domain socks */ 273 #ifdef INET6 274 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 275 #else 276 static int family = PF_INET; /* protocol family (IPv4 only) */ 277 #endif 278 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 279 static int use_bootfile; /* log entire bootfile for every kern msg */ 280 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 281 282 static char bootfile[MAXLINE+1]; /* booted kernel file */ 283 284 struct allowedpeer *AllowedPeers; /* List of allowed peers */ 285 static int NumAllowed; /* Number of entries in AllowedPeers */ 286 287 static int UniquePriority; /* Only log specified priority? */ 288 static int LogFacPri; /* Put facility and priority in log message: */ 289 /* 0=no, 1=numeric, 2=names */ 290 static int KeepKernFac; /* Keep remotely logged kernel facility */ 291 292 volatile sig_atomic_t MarkSet, WantDie; 293 294 static int allowaddr(char *); 295 static void cfline(const char *, struct filed *, 296 const char *, const char *); 297 static const char *cvthname(struct sockaddr *); 298 static void deadq_enter(pid_t, const char *); 299 static int deadq_remove(pid_t); 300 static int decode(const char *, CODE *); 301 static void die(int); 302 static void dodie(int); 303 static void domark(int); 304 static void fprintlog(struct filed *, int, const char *); 305 static int *socksetup(int, const char *); 306 static void init(int); 307 static void logerror(const char *); 308 static void logmsg(int, const char *, const char *, int); 309 static void log_deadchild(pid_t, int, const char *); 310 static void markit(void); 311 static int skip_message(const char *, const char *, int); 312 static void printline(const char *, char *); 313 static void printsys(char *); 314 static int p_open(const char *, pid_t *); 315 static void readklog(void); 316 static void reapchild(int); 317 static void usage(void); 318 static int validate(struct sockaddr *, const char *); 319 static void unmapped(struct sockaddr *); 320 static void wallmsg(struct filed *, struct iovec *); 321 static int waitdaemon(int, int, int); 322 static void timedout(int); 323 324 int 325 main(int argc, char *argv[]) 326 { 327 int ch, i, fdsrmax = 0, l; 328 struct sockaddr_un sunx, fromunix; 329 struct sockaddr_storage frominet; 330 fd_set *fdsr = NULL; 331 FILE *fp; 332 char line[MAXLINE + 1]; 333 const char *bindhostname, *hname; 334 struct timeval tv, *tvp; 335 struct sigaction sact; 336 sigset_t mask; 337 pid_t ppid = 1; 338 socklen_t len; 339 340 bindhostname = NULL; 341 while ((ch = getopt(argc, argv, "46Aa:b:cdf:kl:m:nop:P:suv")) != -1) 342 switch (ch) { 343 case '4': 344 family = PF_INET; 345 break; 346 #ifdef INET6 347 case '6': 348 family = PF_INET6; 349 break; 350 #endif 351 case 'A': 352 send_to_all++; 353 break; 354 case 'a': /* allow specific network addresses only */ 355 if (allowaddr(optarg) == -1) 356 usage(); 357 break; 358 case 'b': 359 bindhostname = optarg; 360 break; 361 case 'c': 362 no_compress++; 363 break; 364 case 'd': /* debug */ 365 Debug++; 366 break; 367 case 'f': /* configuration file */ 368 ConfFile = optarg; 369 break; 370 case 'k': /* keep remote kern fac */ 371 KeepKernFac = 1; 372 break; 373 case 'l': 374 if (nfunix < MAXFUNIX) 375 funixn[nfunix++] = optarg; 376 else 377 warnx("out of descriptors, ignoring %s", 378 optarg); 379 break; 380 case 'm': /* mark interval */ 381 MarkInterval = atoi(optarg) * 60; 382 break; 383 case 'n': 384 resolve = 0; 385 break; 386 case 'o': 387 use_bootfile = 1; 388 break; 389 case 'p': /* path */ 390 funixn[0] = optarg; 391 break; 392 case 'P': /* path for alt. PID */ 393 PidFile = optarg; 394 break; 395 case 's': /* no network mode */ 396 SecureMode++; 397 break; 398 case 'u': /* only log specified priority */ 399 UniquePriority++; 400 break; 401 case 'v': /* log facility and priority */ 402 LogFacPri++; 403 break; 404 case '?': 405 default: 406 usage(); 407 } 408 if ((argc -= optind) != 0) 409 usage(); 410 411 if (!Debug) { 412 ppid = waitdaemon(0, 0, 30); 413 if (ppid < 0) 414 err(1, "could not become daemon"); 415 } else { 416 setlinebuf(stdout); 417 } 418 419 if (NumAllowed) 420 endservent(); 421 422 consfile.f_type = F_CONSOLE; 423 (void)strlcpy(consfile.f_un.f_fname, ctty + sizeof _PATH_DEV - 1, 424 sizeof(consfile.f_un.f_fname)); 425 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 426 (void)signal(SIGTERM, dodie); 427 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 428 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 429 /* 430 * We don't want the SIGCHLD and SIGHUP handlers to interfere 431 * with each other; they are likely candidates for being called 432 * simultaneously (SIGHUP closes pipe descriptor, process dies, 433 * SIGCHLD happens). 434 */ 435 sigemptyset(&mask); 436 sigaddset(&mask, SIGHUP); 437 sact.sa_handler = reapchild; 438 sact.sa_mask = mask; 439 sact.sa_flags = SA_RESTART; 440 (void)sigaction(SIGCHLD, &sact, NULL); 441 (void)signal(SIGALRM, domark); 442 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 443 (void)alarm(TIMERINTVL); 444 445 TAILQ_INIT(&deadq_head); 446 447 #ifndef SUN_LEN 448 #define SUN_LEN(unp) (strlen((unp)->sun_path) + 2) 449 #endif 450 for (i = 0; i < nfunix; i++) { 451 (void)unlink(funixn[i]); 452 memset(&sunx, 0, sizeof(sunx)); 453 sunx.sun_family = AF_UNIX; 454 (void)strlcpy(sunx.sun_path, funixn[i], sizeof(sunx.sun_path)); 455 funix[i] = socket(AF_UNIX, SOCK_DGRAM, 0); 456 if (funix[i] < 0 || 457 bind(funix[i], (struct sockaddr *)&sunx, 458 SUN_LEN(&sunx)) < 0 || 459 chmod(funixn[i], 0666) < 0) { 460 (void)snprintf(line, sizeof line, 461 "cannot create %s", funixn[i]); 462 logerror(line); 463 dprintf("cannot create %s (%d)\n", funixn[i], errno); 464 if (i == 0) 465 die(0); 466 } 467 } 468 if (SecureMode <= 1) 469 finet = socksetup(family, bindhostname); 470 471 if (finet) { 472 if (SecureMode) { 473 for (i = 0; i < *finet; i++) { 474 if (shutdown(finet[i+1], SHUT_RD) < 0) { 475 logerror("shutdown"); 476 if (!Debug) 477 die(0); 478 } 479 } 480 } else { 481 dprintf("listening on inet and/or inet6 socket\n"); 482 } 483 dprintf("sending on inet and/or inet6 socket\n"); 484 } 485 486 if ((fklog = open(_PATH_KLOG, O_RDONLY, 0)) >= 0) 487 if (fcntl(fklog, F_SETFL, O_NONBLOCK) < 0) 488 fklog = -1; 489 if (fklog < 0) 490 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 491 492 /* tuck my process id away */ 493 fp = fopen(PidFile, "w"); 494 if (fp != NULL) { 495 fprintf(fp, "%d\n", getpid()); 496 (void)fclose(fp); 497 } 498 499 dprintf("off & running....\n"); 500 501 init(0); 502 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 503 sigemptyset(&mask); 504 sigaddset(&mask, SIGCHLD); 505 sact.sa_handler = init; 506 sact.sa_mask = mask; 507 sact.sa_flags = SA_RESTART; 508 (void)sigaction(SIGHUP, &sact, NULL); 509 510 tvp = &tv; 511 tv.tv_sec = tv.tv_usec = 0; 512 513 if (fklog != -1 && fklog > fdsrmax) 514 fdsrmax = fklog; 515 if (finet && !SecureMode) { 516 for (i = 0; i < *finet; i++) { 517 if (finet[i+1] != -1 && finet[i+1] > fdsrmax) 518 fdsrmax = finet[i+1]; 519 } 520 } 521 for (i = 0; i < nfunix; i++) { 522 if (funix[i] != -1 && funix[i] > fdsrmax) 523 fdsrmax = funix[i]; 524 } 525 526 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 527 sizeof(fd_mask)); 528 if (fdsr == NULL) 529 errx(1, "calloc fd_set"); 530 531 for (;;) { 532 if (MarkSet) 533 markit(); 534 if (WantDie) 535 die(WantDie); 536 537 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 538 sizeof(fd_mask)); 539 540 if (fklog != -1) 541 FD_SET(fklog, fdsr); 542 if (finet && !SecureMode) { 543 for (i = 0; i < *finet; i++) { 544 if (finet[i+1] != -1) 545 FD_SET(finet[i+1], fdsr); 546 } 547 } 548 for (i = 0; i < nfunix; i++) { 549 if (funix[i] != -1) 550 FD_SET(funix[i], fdsr); 551 } 552 553 i = select(fdsrmax+1, fdsr, NULL, NULL, tvp); 554 switch (i) { 555 case 0: 556 if (tvp) { 557 tvp = NULL; 558 if (ppid != 1) 559 kill(ppid, SIGALRM); 560 } 561 continue; 562 case -1: 563 if (errno != EINTR) 564 logerror("select"); 565 continue; 566 } 567 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 568 readklog(); 569 if (finet && !SecureMode) { 570 for (i = 0; i < *finet; i++) { 571 if (FD_ISSET(finet[i+1], fdsr)) { 572 len = sizeof(frominet); 573 l = recvfrom(finet[i+1], line, MAXLINE, 574 0, (struct sockaddr *)&frominet, 575 &len); 576 if (l > 0) { 577 line[l] = '\0'; 578 hname = cvthname((struct sockaddr *)&frominet); 579 unmapped((struct sockaddr *)&frominet); 580 if (validate((struct sockaddr *)&frominet, hname)) 581 printline(hname, line); 582 } else if (l < 0 && errno != EINTR) 583 logerror("recvfrom inet"); 584 } 585 } 586 } 587 for (i = 0; i < nfunix; i++) { 588 if (funix[i] != -1 && FD_ISSET(funix[i], fdsr)) { 589 len = sizeof(fromunix); 590 l = recvfrom(funix[i], line, MAXLINE, 0, 591 (struct sockaddr *)&fromunix, &len); 592 if (l > 0) { 593 line[l] = '\0'; 594 printline(LocalHostName, line); 595 } else if (l < 0 && errno != EINTR) 596 logerror("recvfrom unix"); 597 } 598 } 599 } 600 if (fdsr) 601 free(fdsr); 602 } 603 604 static void 605 unmapped(struct sockaddr *sa) 606 { 607 struct sockaddr_in6 *sin6; 608 struct sockaddr_in sin4; 609 610 if (sa->sa_family != AF_INET6) 611 return; 612 if (sa->sa_len != sizeof(struct sockaddr_in6) || 613 sizeof(sin4) > sa->sa_len) 614 return; 615 sin6 = (struct sockaddr_in6 *)sa; 616 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 617 return; 618 619 memset(&sin4, 0, sizeof(sin4)); 620 sin4.sin_family = AF_INET; 621 sin4.sin_len = sizeof(struct sockaddr_in); 622 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 623 sizeof(sin4.sin_addr)); 624 sin4.sin_port = sin6->sin6_port; 625 626 memcpy(sa, &sin4, sin4.sin_len); 627 } 628 629 static void 630 usage(void) 631 { 632 633 fprintf(stderr, "%s\n%s\n%s\n%s\n", 634 "usage: syslogd [-46Acdknosuv] [-a allowed_peer]", 635 " [-b bind address] [-f config_file]", 636 " [-l log_socket] [-m mark_interval]", 637 " [-P pid_file] [-p log_socket]"); 638 exit(1); 639 } 640 641 /* 642 * Take a raw input line, decode the message, and print the message 643 * on the appropriate log files. 644 */ 645 static void 646 printline(const char *hname, char *msg) 647 { 648 int c, pri; 649 char *p, *q, line[MAXLINE + 1]; 650 651 /* test for special codes */ 652 pri = DEFUPRI; 653 p = msg; 654 if (*p == '<') { 655 pri = 0; 656 while (isdigit(*++p)) 657 pri = 10 * pri + (*p - '0'); 658 if (*p == '>') 659 ++p; 660 } 661 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 662 pri = DEFUPRI; 663 664 /* don't allow users to log kernel messages */ 665 if (LOG_FAC(pri) == LOG_KERN && !KeepKernFac) 666 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 667 668 q = line; 669 670 while ((c = (unsigned char)*p++) != '\0' && 671 q < &line[sizeof(line) - 4]) { 672 if ((c & 0x80) && c < 0xA0) { 673 c &= 0x7F; 674 *q++ = 'M'; 675 *q++ = '-'; 676 } 677 if (isascii(c) && iscntrl(c)) { 678 if (c == '\n') { 679 *q++ = ' '; 680 } else if (c == '\t') { 681 *q++ = '\t'; 682 } else { 683 *q++ = '^'; 684 *q++ = c ^ 0100; 685 } 686 } else { 687 *q++ = c; 688 } 689 } 690 *q = '\0'; 691 692 logmsg(pri, line, hname, 0); 693 } 694 695 /* 696 * Read /dev/klog while data are available, split into lines. 697 */ 698 static void 699 readklog(void) 700 { 701 char *p, *q, line[MAXLINE + 1]; 702 int len, i; 703 704 len = 0; 705 for (;;) { 706 i = read(fklog, line + len, MAXLINE - 1 - len); 707 if (i > 0) { 708 line[i + len] = '\0'; 709 } else { 710 if (i < 0 && errno != EINTR && errno != EAGAIN) { 711 logerror("klog"); 712 fklog = -1; 713 } 714 break; 715 } 716 717 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 718 *q = '\0'; 719 printsys(p); 720 } 721 len = strlen(p); 722 if (len >= MAXLINE - 1) { 723 printsys(p); 724 len = 0; 725 } 726 if (len > 0) 727 memmove(line, p, len + 1); 728 } 729 if (len > 0) 730 printsys(line); 731 } 732 733 /* 734 * Take a raw input line from /dev/klog, format similar to syslog(). 735 */ 736 static void 737 printsys(char *p) 738 { 739 int pri, flags; 740 741 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 742 pri = DEFSPRI; 743 if (*p == '<') { 744 pri = 0; 745 while (isdigit(*++p)) 746 pri = 10 * pri + (*p - '0'); 747 if (*p == '>') 748 ++p; 749 if ((pri & LOG_FACMASK) == LOG_CONSOLE) 750 flags |= IGN_CONS; 751 } else { 752 /* kernel printf's come out on console */ 753 flags |= IGN_CONS; 754 } 755 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 756 pri = DEFSPRI; 757 logmsg(pri, p, LocalHostName, flags); 758 } 759 760 static time_t now; 761 762 /* 763 * Match a program or host name against a specification. 764 * Return a non-0 value if the message must be ignored 765 * based on the specification. 766 */ 767 static int 768 skip_message(const char *name, const char *spec, int checkcase) { 769 const char *s; 770 char prev, next; 771 int exclude = 0; 772 /* Behaviour on explicit match */ 773 774 if (spec == NULL) 775 return 0; 776 switch (*spec) { 777 case '-': 778 exclude = 1; 779 /*FALLTHROUGH*/ 780 case '+': 781 spec++; 782 break; 783 default: 784 break; 785 } 786 if (checkcase) 787 s = strstr (spec, name); 788 else 789 s = strcasestr (spec, name); 790 791 if (s != NULL) { 792 prev = (s == spec ? ',' : *(s - 1)); 793 next = *(s + strlen (name)); 794 795 if (prev == ',' && (next == '\0' || next == ',')) 796 /* Explicit match: skip iff the spec is an 797 exclusive one. */ 798 return exclude; 799 } 800 801 /* No explicit match for this name: skip the message iff 802 the spec is an inclusive one. */ 803 return !exclude; 804 } 805 806 /* 807 * Log a message to the appropriate log files, users, etc. based on 808 * the priority. 809 */ 810 static void 811 logmsg(int pri, const char *msg, const char *from, int flags) 812 { 813 struct filed *f; 814 int i, fac, msglen, omask, prilev; 815 const char *timestamp; 816 char prog[NAME_MAX+1]; 817 char buf[MAXLINE+1]; 818 819 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 820 pri, flags, from, msg); 821 822 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 823 824 /* 825 * Check to see if msg looks non-standard. 826 */ 827 msglen = strlen(msg); 828 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 829 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 830 flags |= ADDDATE; 831 832 (void)time(&now); 833 if (flags & ADDDATE) { 834 timestamp = ctime(&now) + 4; 835 } else { 836 timestamp = msg; 837 msg += 16; 838 msglen -= 16; 839 } 840 841 /* skip leading blanks */ 842 while (isspace(*msg)) { 843 msg++; 844 msglen--; 845 } 846 847 /* extract facility and priority level */ 848 if (flags & MARK) 849 fac = LOG_NFACILITIES; 850 else 851 fac = LOG_FAC(pri); 852 prilev = LOG_PRI(pri); 853 854 /* extract program name */ 855 for (i = 0; i < NAME_MAX; i++) { 856 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[') 857 break; 858 prog[i] = msg[i]; 859 } 860 prog[i] = 0; 861 862 /* add kernel prefix for kernel messages */ 863 if (flags & ISKERNEL) { 864 snprintf(buf, sizeof(buf), "%s: %s", 865 use_bootfile ? bootfile : "kernel", msg); 866 msg = buf; 867 msglen = strlen(buf); 868 } 869 870 /* log the message to the particular outputs */ 871 if (!Initialized) { 872 f = &consfile; 873 f->f_file = open(ctty, O_WRONLY, 0); 874 875 if (f->f_file >= 0) { 876 (void)strlcpy(f->f_lasttime, timestamp, 877 sizeof(f->f_lasttime)); 878 fprintlog(f, flags, msg); 879 (void)close(f->f_file); 880 } 881 (void)sigsetmask(omask); 882 return; 883 } 884 for (f = Files; f; f = f->f_next) { 885 /* skip messages that are incorrect priority */ 886 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 887 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 888 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 889 ) 890 || f->f_pmask[fac] == INTERNAL_NOPRI) 891 continue; 892 893 /* skip messages with the incorrect hostname */ 894 if (skip_message(from, f->f_host, 0)) 895 continue; 896 897 /* skip messages with the incorrect program name */ 898 if (skip_message(prog, f->f_program, 1)) 899 continue; 900 901 /* skip message to console if it has already been printed */ 902 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 903 continue; 904 905 /* don't output marks to recently written files */ 906 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 907 continue; 908 909 /* 910 * suppress duplicate lines to this file 911 */ 912 if (no_compress - (f->f_type != F_PIPE) < 1 && 913 (flags & MARK) == 0 && msglen == f->f_prevlen && 914 !strcmp(msg, f->f_prevline) && 915 !strcasecmp(from, f->f_prevhost)) { 916 (void)strlcpy(f->f_lasttime, timestamp, 917 sizeof(f->f_lasttime)); 918 f->f_prevcount++; 919 dprintf("msg repeated %d times, %ld sec of %d\n", 920 f->f_prevcount, (long)(now - f->f_time), 921 repeatinterval[f->f_repeatcount]); 922 /* 923 * If domark would have logged this by now, 924 * flush it now (so we don't hold isolated messages), 925 * but back off so we'll flush less often 926 * in the future. 927 */ 928 if (now > REPEATTIME(f)) { 929 fprintlog(f, flags, (char *)NULL); 930 BACKOFF(f); 931 } 932 } else { 933 /* new line, save it */ 934 if (f->f_prevcount) 935 fprintlog(f, 0, (char *)NULL); 936 f->f_repeatcount = 0; 937 f->f_prevpri = pri; 938 (void)strlcpy(f->f_lasttime, timestamp, 939 sizeof(f->f_lasttime)); 940 (void)strlcpy(f->f_prevhost, from, 941 sizeof(f->f_prevhost)); 942 if (msglen < MAXSVLINE) { 943 f->f_prevlen = msglen; 944 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 945 fprintlog(f, flags, (char *)NULL); 946 } else { 947 f->f_prevline[0] = 0; 948 f->f_prevlen = 0; 949 fprintlog(f, flags, msg); 950 } 951 } 952 } 953 (void)sigsetmask(omask); 954 } 955 956 static void 957 fprintlog(struct filed *f, int flags, const char *msg) 958 { 959 struct iovec iov[7]; 960 struct iovec *v; 961 struct addrinfo *r; 962 int i, l, lsent = 0; 963 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 964 const char *msgret; 965 966 v = iov; 967 if (f->f_type == F_WALL) { 968 v->iov_base = greetings; 969 v->iov_len = snprintf(greetings, sizeof greetings, 970 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 971 f->f_prevhost, ctime(&now)); 972 if (v->iov_len > 0) 973 v++; 974 v->iov_base = ""; 975 v->iov_len = 0; 976 v++; 977 } else { 978 v->iov_base = f->f_lasttime; 979 v->iov_len = 15; 980 v++; 981 v->iov_base = " "; 982 v->iov_len = 1; 983 v++; 984 } 985 986 if (LogFacPri) { 987 static char fp_buf[30]; /* Hollow laugh */ 988 int fac = f->f_prevpri & LOG_FACMASK; 989 int pri = LOG_PRI(f->f_prevpri); 990 const char *f_s = NULL; 991 char f_n[5]; /* Hollow laugh */ 992 const char *p_s = NULL; 993 char p_n[5]; /* Hollow laugh */ 994 995 if (LogFacPri > 1) { 996 CODE *c; 997 998 for (c = facilitynames; c->c_name; c++) { 999 if (c->c_val == fac) { 1000 f_s = c->c_name; 1001 break; 1002 } 1003 } 1004 for (c = prioritynames; c->c_name; c++) { 1005 if (c->c_val == pri) { 1006 p_s = c->c_name; 1007 break; 1008 } 1009 } 1010 } 1011 if (!f_s) { 1012 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1013 f_s = f_n; 1014 } 1015 if (!p_s) { 1016 snprintf(p_n, sizeof p_n, "%d", pri); 1017 p_s = p_n; 1018 } 1019 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1020 v->iov_base = fp_buf; 1021 v->iov_len = strlen(fp_buf); 1022 } else { 1023 v->iov_base=""; 1024 v->iov_len = 0; 1025 } 1026 v++; 1027 1028 v->iov_base = f->f_prevhost; 1029 v->iov_len = strlen(v->iov_base); 1030 v++; 1031 v->iov_base = " "; 1032 v->iov_len = 1; 1033 v++; 1034 1035 if (msg) { 1036 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1037 if (wmsg == NULL) { 1038 logerror("strdup"); 1039 exit(1); 1040 } 1041 v->iov_base = wmsg; 1042 v->iov_len = strlen(msg); 1043 } else if (f->f_prevcount > 1) { 1044 v->iov_base = repbuf; 1045 v->iov_len = snprintf(repbuf, sizeof repbuf, 1046 "last message repeated %d times", f->f_prevcount); 1047 } else { 1048 v->iov_base = f->f_prevline; 1049 v->iov_len = f->f_prevlen; 1050 } 1051 v++; 1052 1053 dprintf("Logging to %s", TypeNames[f->f_type]); 1054 f->f_time = now; 1055 1056 switch (f->f_type) { 1057 case F_UNUSED: 1058 dprintf("\n"); 1059 break; 1060 1061 case F_FORW: 1062 dprintf(" %s\n", f->f_un.f_forw.f_hname); 1063 /* check for local vs remote messages */ 1064 if (strcasecmp(f->f_prevhost, LocalHostName)) 1065 l = snprintf(line, sizeof line - 1, 1066 "<%d>%.15s Forwarded from %s: %s", 1067 f->f_prevpri, iov[0].iov_base, f->f_prevhost, 1068 iov[5].iov_base); 1069 else 1070 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1071 f->f_prevpri, iov[0].iov_base, iov[5].iov_base); 1072 if (l < 0) 1073 l = 0; 1074 else if (l > MAXLINE) 1075 l = MAXLINE; 1076 1077 if (finet) { 1078 for (r = f->f_un.f_forw.f_addr; r; r = r->ai_next) { 1079 for (i = 0; i < *finet; i++) { 1080 #if 0 1081 /* 1082 * should we check AF first, or just 1083 * trial and error? FWD 1084 */ 1085 if (r->ai_family == 1086 address_family_of(finet[i+1])) 1087 #endif 1088 lsent = sendto(finet[i+1], line, l, 0, 1089 r->ai_addr, r->ai_addrlen); 1090 if (lsent == l) 1091 break; 1092 } 1093 if (lsent == l && !send_to_all) 1094 break; 1095 } 1096 dprintf("lsent/l: %d/%d\n", lsent, l); 1097 if (lsent != l) { 1098 int e = errno; 1099 logerror("sendto"); 1100 errno = e; 1101 switch (errno) { 1102 case EHOSTUNREACH: 1103 case EHOSTDOWN: 1104 break; 1105 /* case EBADF: */ 1106 /* case EACCES: */ 1107 /* case ENOTSOCK: */ 1108 /* case EFAULT: */ 1109 /* case EMSGSIZE: */ 1110 /* case EAGAIN: */ 1111 /* case ENOBUFS: */ 1112 /* case ECONNREFUSED: */ 1113 default: 1114 dprintf("removing entry\n", e); 1115 (void)close(f->f_file); 1116 f->f_type = F_UNUSED; 1117 break; 1118 } 1119 } 1120 } 1121 break; 1122 1123 case F_FILE: 1124 dprintf(" %s\n", f->f_un.f_fname); 1125 v->iov_base = "\n"; 1126 v->iov_len = 1; 1127 if (writev(f->f_file, iov, 7) < 0) { 1128 int e = errno; 1129 (void)close(f->f_file); 1130 f->f_type = F_UNUSED; 1131 errno = e; 1132 logerror(f->f_un.f_fname); 1133 } else if (flags & SYNC_FILE) 1134 (void)fsync(f->f_file); 1135 break; 1136 1137 case F_PIPE: 1138 dprintf(" %s\n", f->f_un.f_pipe.f_pname); 1139 v->iov_base = "\n"; 1140 v->iov_len = 1; 1141 if (f->f_un.f_pipe.f_pid == 0) { 1142 if ((f->f_file = p_open(f->f_un.f_pipe.f_pname, 1143 &f->f_un.f_pipe.f_pid)) < 0) { 1144 f->f_type = F_UNUSED; 1145 logerror(f->f_un.f_pipe.f_pname); 1146 break; 1147 } 1148 } 1149 if (writev(f->f_file, iov, 7) < 0) { 1150 int e = errno; 1151 (void)close(f->f_file); 1152 if (f->f_un.f_pipe.f_pid > 0) 1153 deadq_enter(f->f_un.f_pipe.f_pid, 1154 f->f_un.f_pipe.f_pname); 1155 f->f_un.f_pipe.f_pid = 0; 1156 errno = e; 1157 logerror(f->f_un.f_pipe.f_pname); 1158 } 1159 break; 1160 1161 case F_CONSOLE: 1162 if (flags & IGN_CONS) { 1163 dprintf(" (ignored)\n"); 1164 break; 1165 } 1166 /* FALLTHROUGH */ 1167 1168 case F_TTY: 1169 dprintf(" %s%s\n", _PATH_DEV, f->f_un.f_fname); 1170 v->iov_base = "\r\n"; 1171 v->iov_len = 2; 1172 1173 errno = 0; /* ttymsg() only sometimes returns an errno */ 1174 if ((msgret = ttymsg(iov, 7, f->f_un.f_fname, 10))) { 1175 f->f_type = F_UNUSED; 1176 logerror(msgret); 1177 } 1178 break; 1179 1180 case F_USERS: 1181 case F_WALL: 1182 dprintf("\n"); 1183 v->iov_base = "\r\n"; 1184 v->iov_len = 2; 1185 wallmsg(f, iov); 1186 break; 1187 } 1188 f->f_prevcount = 0; 1189 if (msg) 1190 free(wmsg); 1191 } 1192 1193 /* 1194 * WALLMSG -- Write a message to the world at large 1195 * 1196 * Write the specified message to either the entire 1197 * world, or a list of approved users. 1198 */ 1199 static void 1200 wallmsg(struct filed *f, struct iovec *iov) 1201 { 1202 static int reenter; /* avoid calling ourselves */ 1203 FILE *uf; 1204 struct utmp ut; 1205 int i; 1206 const char *p; 1207 char line[sizeof(ut.ut_line) + 1]; 1208 1209 if (reenter++) 1210 return; 1211 if ((uf = fopen(_PATH_UTMP, "r")) == NULL) { 1212 logerror(_PATH_UTMP); 1213 reenter = 0; 1214 return; 1215 } 1216 /* NOSTRICT */ 1217 while (fread((char *)&ut, sizeof(ut), 1, uf) == 1) { 1218 if (ut.ut_name[0] == '\0') 1219 continue; 1220 (void)strlcpy(line, ut.ut_line, sizeof(line)); 1221 if (f->f_type == F_WALL) { 1222 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) != NULL) { 1223 errno = 0; /* already in msg */ 1224 logerror(p); 1225 } 1226 continue; 1227 } 1228 /* should we send the message to this user? */ 1229 for (i = 0; i < MAXUNAMES; i++) { 1230 if (!f->f_un.f_uname[i][0]) 1231 break; 1232 if (!strncmp(f->f_un.f_uname[i], ut.ut_name, 1233 UT_NAMESIZE)) { 1234 if ((p = ttymsg(iov, 7, line, TTYMSGTIME)) 1235 != NULL) { 1236 errno = 0; /* already in msg */ 1237 logerror(p); 1238 } 1239 break; 1240 } 1241 } 1242 } 1243 (void)fclose(uf); 1244 reenter = 0; 1245 } 1246 1247 static void 1248 reapchild(int signo __unused) 1249 { 1250 int status; 1251 pid_t pid; 1252 struct filed *f; 1253 1254 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1255 if (!Initialized) 1256 /* Don't tell while we are initting. */ 1257 continue; 1258 1259 /* First, look if it's a process from the dead queue. */ 1260 if (deadq_remove(pid)) 1261 goto oncemore; 1262 1263 /* Now, look in list of active processes. */ 1264 for (f = Files; f; f = f->f_next) 1265 if (f->f_type == F_PIPE && 1266 f->f_un.f_pipe.f_pid == pid) { 1267 (void)close(f->f_file); 1268 f->f_un.f_pipe.f_pid = 0; 1269 log_deadchild(pid, status, 1270 f->f_un.f_pipe.f_pname); 1271 break; 1272 } 1273 oncemore: 1274 continue; 1275 } 1276 } 1277 1278 /* 1279 * Return a printable representation of a host address. 1280 */ 1281 static const char * 1282 cvthname(struct sockaddr *f) 1283 { 1284 int error, hl; 1285 sigset_t omask, nmask; 1286 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1287 1288 error = getnameinfo((struct sockaddr *)f, 1289 ((struct sockaddr *)f)->sa_len, 1290 ip, sizeof ip, NULL, 0, 1291 NI_NUMERICHOST | withscopeid); 1292 dprintf("cvthname(%s)\n", ip); 1293 1294 if (error) { 1295 dprintf("Malformed from address %s\n", gai_strerror(error)); 1296 return ("???"); 1297 } 1298 if (!resolve) 1299 return (ip); 1300 1301 sigemptyset(&nmask); 1302 sigaddset(&nmask, SIGHUP); 1303 sigprocmask(SIG_BLOCK, &nmask, &omask); 1304 error = getnameinfo((struct sockaddr *)f, 1305 ((struct sockaddr *)f)->sa_len, 1306 hname, sizeof hname, NULL, 0, 1307 NI_NAMEREQD | withscopeid); 1308 sigprocmask(SIG_SETMASK, &omask, NULL); 1309 if (error) { 1310 dprintf("Host name for your address (%s) unknown\n", ip); 1311 return (ip); 1312 } 1313 hl = strlen(hname); 1314 if (hl > 0 && hname[hl-1] == '.') 1315 hname[--hl] = '\0'; 1316 trimdomain(hname, hl); 1317 return (hname); 1318 } 1319 1320 static void 1321 dodie(int signo) 1322 { 1323 1324 WantDie = signo; 1325 } 1326 1327 static void 1328 domark(int signo __unused) 1329 { 1330 1331 MarkSet = 1; 1332 } 1333 1334 /* 1335 * Print syslogd errors some place. 1336 */ 1337 static void 1338 logerror(const char *type) 1339 { 1340 char buf[512]; 1341 1342 if (errno) 1343 (void)snprintf(buf, 1344 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1345 else 1346 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1347 errno = 0; 1348 dprintf("%s\n", buf); 1349 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1350 } 1351 1352 static void 1353 die(int signo) 1354 { 1355 struct filed *f; 1356 int was_initialized; 1357 char buf[100]; 1358 int i; 1359 1360 was_initialized = Initialized; 1361 Initialized = 0; /* Don't log SIGCHLDs. */ 1362 for (f = Files; f != NULL; f = f->f_next) { 1363 /* flush any pending output */ 1364 if (f->f_prevcount) 1365 fprintlog(f, 0, (char *)NULL); 1366 if (f->f_type == F_PIPE) 1367 (void)close(f->f_file); 1368 } 1369 Initialized = was_initialized; 1370 if (signo) { 1371 dprintf("syslogd: exiting on signal %d\n", signo); 1372 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1373 errno = 0; 1374 logerror(buf); 1375 } 1376 for (i = 0; i < nfunix; i++) 1377 if (funixn[i] && funix[i] != -1) 1378 (void)unlink(funixn[i]); 1379 exit(1); 1380 } 1381 1382 /* 1383 * INIT -- Initialize syslogd from configuration table 1384 */ 1385 static void 1386 init(int signo) 1387 { 1388 int i; 1389 FILE *cf; 1390 struct filed *f, *next, **nextp; 1391 char *p; 1392 char cline[LINE_MAX]; 1393 char prog[NAME_MAX+1]; 1394 char host[MAXHOSTNAMELEN]; 1395 char oldLocalHostName[MAXHOSTNAMELEN]; 1396 char hostMsg[2*MAXHOSTNAMELEN+40]; 1397 char bootfileMsg[LINE_MAX]; 1398 1399 dprintf("init\n"); 1400 1401 /* 1402 * Load hostname (may have changed). 1403 */ 1404 if (signo != 0) 1405 (void)strlcpy(oldLocalHostName, LocalHostName, 1406 sizeof(oldLocalHostName)); 1407 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1408 err(EX_OSERR, "gethostname() failed"); 1409 if ((p = strchr(LocalHostName, '.')) != NULL) { 1410 *p++ = '\0'; 1411 LocalDomain = p; 1412 } else { 1413 LocalDomain = ""; 1414 } 1415 1416 /* 1417 * Close all open log files. 1418 */ 1419 Initialized = 0; 1420 for (f = Files; f != NULL; f = next) { 1421 /* flush any pending output */ 1422 if (f->f_prevcount) 1423 fprintlog(f, 0, (char *)NULL); 1424 1425 switch (f->f_type) { 1426 case F_FILE: 1427 case F_FORW: 1428 case F_CONSOLE: 1429 case F_TTY: 1430 (void)close(f->f_file); 1431 break; 1432 case F_PIPE: 1433 (void)close(f->f_file); 1434 if (f->f_un.f_pipe.f_pid > 0) 1435 deadq_enter(f->f_un.f_pipe.f_pid, 1436 f->f_un.f_pipe.f_pname); 1437 f->f_un.f_pipe.f_pid = 0; 1438 break; 1439 } 1440 next = f->f_next; 1441 if (f->f_program) free(f->f_program); 1442 if (f->f_host) free(f->f_host); 1443 free((char *)f); 1444 } 1445 Files = NULL; 1446 nextp = &Files; 1447 1448 /* open the configuration file */ 1449 if ((cf = fopen(ConfFile, "r")) == NULL) { 1450 dprintf("cannot open %s\n", ConfFile); 1451 *nextp = (struct filed *)calloc(1, sizeof(*f)); 1452 if (*nextp == NULL) { 1453 logerror("calloc"); 1454 exit(1); 1455 } 1456 cfline("*.ERR\t/dev/console", *nextp, "*", "*"); 1457 (*nextp)->f_next = (struct filed *)calloc(1, sizeof(*f)); 1458 if ((*nextp)->f_next == NULL) { 1459 logerror("calloc"); 1460 exit(1); 1461 } 1462 cfline("*.PANIC\t*", (*nextp)->f_next, "*", "*"); 1463 Initialized = 1; 1464 return; 1465 } 1466 1467 /* 1468 * Foreach line in the conf table, open that file. 1469 */ 1470 f = NULL; 1471 (void)strlcpy(host, "*", sizeof(host)); 1472 (void)strlcpy(prog, "*", sizeof(prog)); 1473 while (fgets(cline, sizeof(cline), cf) != NULL) { 1474 /* 1475 * check for end-of-section, comments, strip off trailing 1476 * spaces and newline character. #!prog is treated specially: 1477 * following lines apply only to that program. 1478 */ 1479 for (p = cline; isspace(*p); ++p) 1480 continue; 1481 if (*p == 0) 1482 continue; 1483 if (*p == '#') { 1484 p++; 1485 if (*p != '!' && *p != '+' && *p != '-') 1486 continue; 1487 } 1488 if (*p == '+' || *p == '-') { 1489 host[0] = *p++; 1490 while (isspace(*p)) 1491 p++; 1492 if ((!*p) || (*p == '*')) { 1493 (void)strlcpy(host, "*", sizeof(host)); 1494 continue; 1495 } 1496 if (*p == '@') 1497 p = LocalHostName; 1498 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1499 if (!isalnum(*p) && *p != '.' && *p != '-' 1500 && *p != ',') 1501 break; 1502 host[i] = *p++; 1503 } 1504 host[i] = '\0'; 1505 continue; 1506 } 1507 if (*p == '!') { 1508 p++; 1509 while (isspace(*p)) p++; 1510 if ((!*p) || (*p == '*')) { 1511 (void)strlcpy(prog, "*", sizeof(prog)); 1512 continue; 1513 } 1514 for (i = 0; i < NAME_MAX; i++) { 1515 if (!isprint(p[i])) 1516 break; 1517 prog[i] = p[i]; 1518 } 1519 prog[i] = 0; 1520 continue; 1521 } 1522 for (p = strchr(cline, '\0'); isspace(*--p);) 1523 continue; 1524 *++p = '\0'; 1525 f = (struct filed *)calloc(1, sizeof(*f)); 1526 if (f == NULL) { 1527 logerror("calloc"); 1528 exit(1); 1529 } 1530 *nextp = f; 1531 nextp = &f->f_next; 1532 cfline(cline, f, prog, host); 1533 } 1534 1535 /* close the configuration file */ 1536 (void)fclose(cf); 1537 1538 Initialized = 1; 1539 1540 if (Debug) { 1541 for (f = Files; f; f = f->f_next) { 1542 for (i = 0; i <= LOG_NFACILITIES; i++) 1543 if (f->f_pmask[i] == INTERNAL_NOPRI) 1544 printf("X "); 1545 else 1546 printf("%d ", f->f_pmask[i]); 1547 printf("%s: ", TypeNames[f->f_type]); 1548 switch (f->f_type) { 1549 case F_FILE: 1550 printf("%s", f->f_un.f_fname); 1551 break; 1552 1553 case F_CONSOLE: 1554 case F_TTY: 1555 printf("%s%s", _PATH_DEV, f->f_un.f_fname); 1556 break; 1557 1558 case F_FORW: 1559 printf("%s", f->f_un.f_forw.f_hname); 1560 break; 1561 1562 case F_PIPE: 1563 printf("%s", f->f_un.f_pipe.f_pname); 1564 break; 1565 1566 case F_USERS: 1567 for (i = 0; i < MAXUNAMES && *f->f_un.f_uname[i]; i++) 1568 printf("%s, ", f->f_un.f_uname[i]); 1569 break; 1570 } 1571 if (f->f_program) 1572 printf(" (%s)", f->f_program); 1573 printf("\n"); 1574 } 1575 } 1576 1577 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1578 dprintf("syslogd: restarted\n"); 1579 /* 1580 * Log a change in hostname, but only on a restart. 1581 */ 1582 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1583 (void)snprintf(hostMsg, sizeof(hostMsg), 1584 "syslogd: hostname changed, \"%s\" to \"%s\"", 1585 oldLocalHostName, LocalHostName); 1586 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1587 dprintf("%s\n", hostMsg); 1588 } 1589 /* 1590 * Log the kernel boot file if we aren't going to use it as 1591 * the prefix, and if this is *not* a restart. 1592 */ 1593 if (signo == 0 && !use_bootfile) { 1594 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1595 "syslogd: kernel boot file is %s", bootfile); 1596 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1597 dprintf("%s\n", bootfileMsg); 1598 } 1599 } 1600 1601 /* 1602 * Crack a configuration file line 1603 */ 1604 static void 1605 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1606 { 1607 struct addrinfo hints, *res; 1608 int error, i, pri; 1609 const char *p, *q; 1610 char *bp; 1611 char buf[MAXLINE], ebuf[100]; 1612 1613 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1614 1615 errno = 0; /* keep strerror() stuff out of logerror messages */ 1616 1617 /* clear out file entry */ 1618 memset(f, 0, sizeof(*f)); 1619 for (i = 0; i <= LOG_NFACILITIES; i++) 1620 f->f_pmask[i] = INTERNAL_NOPRI; 1621 1622 /* save hostname if any */ 1623 if (host && *host == '*') 1624 host = NULL; 1625 if (host) { 1626 int hl; 1627 1628 f->f_host = strdup(host); 1629 if (f->f_host == NULL) { 1630 logerror("strdup"); 1631 exit(1); 1632 } 1633 hl = strlen(f->f_host); 1634 if (hl > 0 && f->f_host[hl-1] == '.') 1635 f->f_host[--hl] = '\0'; 1636 trimdomain(f->f_host, hl); 1637 } 1638 1639 /* save program name if any */ 1640 if (prog && *prog == '*') 1641 prog = NULL; 1642 if (prog) { 1643 f->f_program = strdup(prog); 1644 if (f->f_program == NULL) { 1645 logerror("strdup"); 1646 exit(1); 1647 } 1648 } 1649 1650 /* scan through the list of selectors */ 1651 for (p = line; *p && *p != '\t' && *p != ' ';) { 1652 int pri_done; 1653 int pri_cmp; 1654 int pri_invert; 1655 1656 /* find the end of this facility name list */ 1657 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1658 continue; 1659 1660 /* get the priority comparison */ 1661 pri_cmp = 0; 1662 pri_done = 0; 1663 pri_invert = 0; 1664 if (*q == '!') { 1665 pri_invert = 1; 1666 q++; 1667 } 1668 while (!pri_done) { 1669 switch (*q) { 1670 case '<': 1671 pri_cmp |= PRI_LT; 1672 q++; 1673 break; 1674 case '=': 1675 pri_cmp |= PRI_EQ; 1676 q++; 1677 break; 1678 case '>': 1679 pri_cmp |= PRI_GT; 1680 q++; 1681 break; 1682 default: 1683 pri_done++; 1684 break; 1685 } 1686 } 1687 1688 /* collect priority name */ 1689 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1690 *bp++ = *q++; 1691 *bp = '\0'; 1692 1693 /* skip cruft */ 1694 while (strchr(",;", *q)) 1695 q++; 1696 1697 /* decode priority name */ 1698 if (*buf == '*') { 1699 pri = LOG_PRIMASK + 1; 1700 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1701 } else { 1702 pri = decode(buf, prioritynames); 1703 if (pri < 0) { 1704 (void)snprintf(ebuf, sizeof ebuf, 1705 "unknown priority name \"%s\"", buf); 1706 logerror(ebuf); 1707 return; 1708 } 1709 } 1710 if (!pri_cmp) 1711 pri_cmp = (UniquePriority) 1712 ? (PRI_EQ) 1713 : (PRI_EQ | PRI_GT) 1714 ; 1715 if (pri_invert) 1716 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 1717 1718 /* scan facilities */ 1719 while (*p && !strchr("\t.; ", *p)) { 1720 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 1721 *bp++ = *p++; 1722 *bp = '\0'; 1723 1724 if (*buf == '*') { 1725 for (i = 0; i < LOG_NFACILITIES; i++) { 1726 f->f_pmask[i] = pri; 1727 f->f_pcmp[i] = pri_cmp; 1728 } 1729 } else { 1730 i = decode(buf, facilitynames); 1731 if (i < 0) { 1732 (void)snprintf(ebuf, sizeof ebuf, 1733 "unknown facility name \"%s\"", 1734 buf); 1735 logerror(ebuf); 1736 return; 1737 } 1738 f->f_pmask[i >> 3] = pri; 1739 f->f_pcmp[i >> 3] = pri_cmp; 1740 } 1741 while (*p == ',' || *p == ' ') 1742 p++; 1743 } 1744 1745 p = q; 1746 } 1747 1748 /* skip to action part */ 1749 while (*p == '\t' || *p == ' ') 1750 p++; 1751 1752 switch (*p) { 1753 case '@': 1754 (void)strlcpy(f->f_un.f_forw.f_hname, ++p, 1755 sizeof(f->f_un.f_forw.f_hname)); 1756 memset(&hints, 0, sizeof(hints)); 1757 hints.ai_family = family; 1758 hints.ai_socktype = SOCK_DGRAM; 1759 error = getaddrinfo(f->f_un.f_forw.f_hname, "syslog", &hints, 1760 &res); 1761 if (error) { 1762 logerror(gai_strerror(error)); 1763 break; 1764 } 1765 f->f_un.f_forw.f_addr = res; 1766 f->f_type = F_FORW; 1767 break; 1768 1769 case '/': 1770 if ((f->f_file = open(p, O_WRONLY|O_APPEND, 0)) < 0) { 1771 f->f_type = F_UNUSED; 1772 logerror(p); 1773 break; 1774 } 1775 if (isatty(f->f_file)) { 1776 if (strcmp(p, ctty) == 0) 1777 f->f_type = F_CONSOLE; 1778 else 1779 f->f_type = F_TTY; 1780 (void)strlcpy(f->f_un.f_fname, p + sizeof(_PATH_DEV) - 1, 1781 sizeof(f->f_un.f_fname)); 1782 } else { 1783 (void)strlcpy(f->f_un.f_fname, p, sizeof(f->f_un.f_fname)); 1784 f->f_type = F_FILE; 1785 } 1786 break; 1787 1788 case '|': 1789 f->f_un.f_pipe.f_pid = 0; 1790 (void)strlcpy(f->f_un.f_fname, p + 1, sizeof(f->f_un.f_fname)); 1791 f->f_type = F_PIPE; 1792 break; 1793 1794 case '*': 1795 f->f_type = F_WALL; 1796 break; 1797 1798 default: 1799 for (i = 0; i < MAXUNAMES && *p; i++) { 1800 for (q = p; *q && *q != ','; ) 1801 q++; 1802 (void)strncpy(f->f_un.f_uname[i], p, UT_NAMESIZE); 1803 if ((q - p) > UT_NAMESIZE) 1804 f->f_un.f_uname[i][UT_NAMESIZE] = '\0'; 1805 else 1806 f->f_un.f_uname[i][q - p] = '\0'; 1807 while (*q == ',' || *q == ' ') 1808 q++; 1809 p = q; 1810 } 1811 f->f_type = F_USERS; 1812 break; 1813 } 1814 } 1815 1816 1817 /* 1818 * Decode a symbolic name to a numeric value 1819 */ 1820 static int 1821 decode(const char *name, CODE *codetab) 1822 { 1823 CODE *c; 1824 char *p, buf[40]; 1825 1826 if (isdigit(*name)) 1827 return (atoi(name)); 1828 1829 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 1830 if (isupper(*name)) 1831 *p = tolower(*name); 1832 else 1833 *p = *name; 1834 } 1835 *p = '\0'; 1836 for (c = codetab; c->c_name; c++) 1837 if (!strcmp(buf, c->c_name)) 1838 return (c->c_val); 1839 1840 return (-1); 1841 } 1842 1843 static void 1844 markit(void) 1845 { 1846 struct filed *f; 1847 dq_t q, next; 1848 1849 now = time((time_t *)NULL); 1850 MarkSeq += TIMERINTVL; 1851 if (MarkSeq >= MarkInterval) { 1852 logmsg(LOG_INFO, "-- MARK --", 1853 LocalHostName, ADDDATE|MARK); 1854 MarkSeq = 0; 1855 } 1856 1857 for (f = Files; f; f = f->f_next) { 1858 if (f->f_prevcount && now >= REPEATTIME(f)) { 1859 dprintf("flush %s: repeated %d times, %d sec.\n", 1860 TypeNames[f->f_type], f->f_prevcount, 1861 repeatinterval[f->f_repeatcount]); 1862 fprintlog(f, 0, (char *)NULL); 1863 BACKOFF(f); 1864 } 1865 } 1866 1867 /* Walk the dead queue, and see if we should signal somebody. */ 1868 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 1869 next = TAILQ_NEXT(q, dq_entries); 1870 1871 switch (q->dq_timeout) { 1872 case 0: 1873 /* Already signalled once, try harder now. */ 1874 if (kill(q->dq_pid, SIGKILL) != 0) 1875 (void)deadq_remove(q->dq_pid); 1876 break; 1877 1878 case 1: 1879 /* 1880 * Timed out on dead queue, send terminate 1881 * signal. Note that we leave the removal 1882 * from the dead queue to reapchild(), which 1883 * will also log the event (unless the process 1884 * didn't even really exist, in case we simply 1885 * drop it from the dead queue). 1886 */ 1887 if (kill(q->dq_pid, SIGTERM) != 0) 1888 (void)deadq_remove(q->dq_pid); 1889 /* FALLTHROUGH */ 1890 1891 default: 1892 q->dq_timeout--; 1893 } 1894 } 1895 MarkSet = 0; 1896 (void)alarm(TIMERINTVL); 1897 } 1898 1899 /* 1900 * fork off and become a daemon, but wait for the child to come online 1901 * before returing to the parent, or we get disk thrashing at boot etc. 1902 * Set a timer so we don't hang forever if it wedges. 1903 */ 1904 static int 1905 waitdaemon(int nochdir, int noclose, int maxwait) 1906 { 1907 int fd; 1908 int status; 1909 pid_t pid, childpid; 1910 1911 switch (childpid = fork()) { 1912 case -1: 1913 return (-1); 1914 case 0: 1915 break; 1916 default: 1917 signal(SIGALRM, timedout); 1918 alarm(maxwait); 1919 while ((pid = wait3(&status, 0, NULL)) != -1) { 1920 if (WIFEXITED(status)) 1921 errx(1, "child pid %d exited with return code %d", 1922 pid, WEXITSTATUS(status)); 1923 if (WIFSIGNALED(status)) 1924 errx(1, "child pid %d exited on signal %d%s", 1925 pid, WTERMSIG(status), 1926 WCOREDUMP(status) ? " (core dumped)" : 1927 ""); 1928 if (pid == childpid) /* it's gone... */ 1929 break; 1930 } 1931 exit(0); 1932 } 1933 1934 if (setsid() == -1) 1935 return (-1); 1936 1937 if (!nochdir) 1938 (void)chdir("/"); 1939 1940 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 1941 (void)dup2(fd, STDIN_FILENO); 1942 (void)dup2(fd, STDOUT_FILENO); 1943 (void)dup2(fd, STDERR_FILENO); 1944 if (fd > 2) 1945 (void)close (fd); 1946 } 1947 return (getppid()); 1948 } 1949 1950 /* 1951 * We get a SIGALRM from the child when it's running and finished doing it's 1952 * fsync()'s or O_SYNC writes for all the boot messages. 1953 * 1954 * We also get a signal from the kernel if the timer expires, so check to 1955 * see what happened. 1956 */ 1957 static void 1958 timedout(int sig __unused) 1959 { 1960 int left; 1961 left = alarm(0); 1962 signal(SIGALRM, SIG_DFL); 1963 if (left == 0) 1964 errx(1, "timed out waiting for child"); 1965 else 1966 _exit(0); 1967 } 1968 1969 /* 1970 * Add `s' to the list of allowable peer addresses to accept messages 1971 * from. 1972 * 1973 * `s' is a string in the form: 1974 * 1975 * [*]domainname[:{servicename|portnumber|*}] 1976 * 1977 * or 1978 * 1979 * netaddr/maskbits[:{servicename|portnumber|*}] 1980 * 1981 * Returns -1 on error, 0 if the argument was valid. 1982 */ 1983 static int 1984 allowaddr(char *s) 1985 { 1986 char *cp1, *cp2; 1987 struct allowedpeer ap; 1988 struct servent *se; 1989 int masklen = -1, i; 1990 struct addrinfo hints, *res; 1991 struct in_addr *addrp, *maskp; 1992 u_int32_t *addr6p, *mask6p; 1993 char ip[NI_MAXHOST]; 1994 1995 #ifdef INET6 1996 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 1997 #endif 1998 cp1 = s; 1999 if ((cp1 = strrchr(cp1, ':'))) { 2000 /* service/port provided */ 2001 *cp1++ = '\0'; 2002 if (strlen(cp1) == 1 && *cp1 == '*') 2003 /* any port allowed */ 2004 ap.port = 0; 2005 else if ((se = getservbyname(cp1, "udp"))) { 2006 ap.port = ntohs(se->s_port); 2007 } else { 2008 ap.port = strtol(cp1, &cp2, 0); 2009 if (*cp2 != '\0') 2010 return (-1); /* port not numeric */ 2011 } 2012 } else { 2013 if ((se = getservbyname("syslog", "udp"))) 2014 ap.port = ntohs(se->s_port); 2015 else 2016 /* sanity, should not happen */ 2017 ap.port = 514; 2018 } 2019 2020 if ((cp1 = strchr(s, '/')) != NULL && 2021 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2022 *cp1 = '\0'; 2023 if ((masklen = atoi(cp1 + 1)) < 0) 2024 return (-1); 2025 } 2026 #ifdef INET6 2027 if (*s == '[') { 2028 cp2 = s + strlen(s) - 1; 2029 if (*cp2 == ']') { 2030 ++s; 2031 *cp2 = '\0'; 2032 } else { 2033 cp2 = NULL; 2034 } 2035 } else { 2036 cp2 = NULL; 2037 } 2038 #endif 2039 memset(&hints, 0, sizeof(hints)); 2040 hints.ai_family = PF_UNSPEC; 2041 hints.ai_socktype = SOCK_DGRAM; 2042 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2043 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2044 ap.isnumeric = 1; 2045 memcpy(&ap.a_addr, res->ai_addr, res->ai_addrlen); 2046 memset(&ap.a_mask, 0, sizeof(ap.a_mask)); 2047 ap.a_mask.ss_family = res->ai_family; 2048 if (res->ai_family == AF_INET) { 2049 ap.a_mask.ss_len = sizeof(struct sockaddr_in); 2050 maskp = &((struct sockaddr_in *)&ap.a_mask)->sin_addr; 2051 addrp = &((struct sockaddr_in *)&ap.a_addr)->sin_addr; 2052 if (masklen < 0) { 2053 /* use default netmask */ 2054 if (IN_CLASSA(ntohl(addrp->s_addr))) 2055 maskp->s_addr = htonl(IN_CLASSA_NET); 2056 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2057 maskp->s_addr = htonl(IN_CLASSB_NET); 2058 else 2059 maskp->s_addr = htonl(IN_CLASSC_NET); 2060 } else if (masklen <= 32) { 2061 /* convert masklen to netmask */ 2062 if (masklen == 0) 2063 maskp->s_addr = 0; 2064 else 2065 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2066 } else { 2067 freeaddrinfo(res); 2068 return (-1); 2069 } 2070 /* Lose any host bits in the network number. */ 2071 addrp->s_addr &= maskp->s_addr; 2072 } 2073 #ifdef INET6 2074 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2075 ap.a_mask.ss_len = sizeof(struct sockaddr_in6); 2076 if (masklen < 0) 2077 masklen = 128; 2078 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2079 /* convert masklen to netmask */ 2080 while (masklen > 0) { 2081 if (masklen < 32) { 2082 *mask6p = htonl(~(0xffffffff >> masklen)); 2083 break; 2084 } 2085 *mask6p++ = 0xffffffff; 2086 masklen -= 32; 2087 } 2088 /* Lose any host bits in the network number. */ 2089 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_mask)->sin6_addr; 2090 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap.a_addr)->sin6_addr; 2091 for (i = 0; i < 4; i++) 2092 addr6p[i] &= mask6p[i]; 2093 } 2094 #endif 2095 else { 2096 freeaddrinfo(res); 2097 return (-1); 2098 } 2099 freeaddrinfo(res); 2100 } else { 2101 /* arg `s' is domain name */ 2102 ap.isnumeric = 0; 2103 ap.a_name = s; 2104 if (cp1) 2105 *cp1 = '/'; 2106 #ifdef INET6 2107 if (cp2) { 2108 *cp2 = ']'; 2109 --s; 2110 } 2111 #endif 2112 } 2113 2114 if (Debug) { 2115 printf("allowaddr: rule %d: ", NumAllowed); 2116 if (ap.isnumeric) { 2117 printf("numeric, "); 2118 getnameinfo((struct sockaddr *)&ap.a_addr, 2119 ((struct sockaddr *)&ap.a_addr)->sa_len, 2120 ip, sizeof ip, NULL, 0, 2121 NI_NUMERICHOST | withscopeid); 2122 printf("addr = %s, ", ip); 2123 getnameinfo((struct sockaddr *)&ap.a_mask, 2124 ((struct sockaddr *)&ap.a_mask)->sa_len, 2125 ip, sizeof ip, NULL, 0, 2126 NI_NUMERICHOST | withscopeid); 2127 printf("mask = %s; ", ip); 2128 } else { 2129 printf("domainname = %s; ", ap.a_name); 2130 } 2131 printf("port = %d\n", ap.port); 2132 } 2133 2134 if ((AllowedPeers = realloc(AllowedPeers, 2135 ++NumAllowed * sizeof(struct allowedpeer))) 2136 == NULL) { 2137 logerror("realloc"); 2138 exit(1); 2139 } 2140 memcpy(&AllowedPeers[NumAllowed - 1], &ap, sizeof(struct allowedpeer)); 2141 return (0); 2142 } 2143 2144 /* 2145 * Validate that the remote peer has permission to log to us. 2146 */ 2147 static int 2148 validate(struct sockaddr *sa, const char *hname) 2149 { 2150 int i, j, reject; 2151 size_t l1, l2; 2152 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2153 struct allowedpeer *ap; 2154 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2155 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2156 struct addrinfo hints, *res; 2157 u_short sport; 2158 2159 if (NumAllowed == 0) 2160 /* traditional behaviour, allow everything */ 2161 return (1); 2162 2163 (void)strlcpy(name, hname, sizeof(name)); 2164 memset(&hints, 0, sizeof(hints)); 2165 hints.ai_family = PF_UNSPEC; 2166 hints.ai_socktype = SOCK_DGRAM; 2167 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2168 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2169 freeaddrinfo(res); 2170 else if (strchr(name, '.') == NULL) { 2171 strlcat(name, ".", sizeof name); 2172 strlcat(name, LocalDomain, sizeof name); 2173 } 2174 if (getnameinfo(sa, sa->sa_len, ip, sizeof ip, port, sizeof port, 2175 NI_NUMERICHOST | withscopeid | NI_NUMERICSERV) != 0) 2176 return (0); /* for safety, should not occur */ 2177 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2178 ip, port, name); 2179 sport = atoi(port); 2180 2181 /* now, walk down the list */ 2182 for (i = 0, ap = AllowedPeers; i < NumAllowed; i++, ap++) { 2183 if (ap->port != 0 && ap->port != sport) { 2184 dprintf("rejected in rule %d due to port mismatch.\n", i); 2185 continue; 2186 } 2187 2188 if (ap->isnumeric) { 2189 if (ap->a_addr.ss_family != sa->sa_family) { 2190 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2191 continue; 2192 } 2193 if (ap->a_addr.ss_family == AF_INET) { 2194 sin4 = (struct sockaddr_in *)sa; 2195 a4p = (struct sockaddr_in *)&ap->a_addr; 2196 m4p = (struct sockaddr_in *)&ap->a_mask; 2197 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2198 != a4p->sin_addr.s_addr) { 2199 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2200 continue; 2201 } 2202 } 2203 #ifdef INET6 2204 else if (ap->a_addr.ss_family == AF_INET6) { 2205 sin6 = (struct sockaddr_in6 *)sa; 2206 a6p = (struct sockaddr_in6 *)&ap->a_addr; 2207 m6p = (struct sockaddr_in6 *)&ap->a_mask; 2208 #ifdef NI_WITHSCOPEID 2209 if (a6p->sin6_scope_id != 0 && 2210 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2211 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2212 continue; 2213 } 2214 #endif 2215 reject = 0; 2216 for (j = 0; j < 16; j += 4) { 2217 if ((*(u_int32_t *)&sin6->sin6_addr.s6_addr[j] & *(u_int32_t *)&m6p->sin6_addr.s6_addr[j]) 2218 != *(u_int32_t *)&a6p->sin6_addr.s6_addr[j]) { 2219 ++reject; 2220 break; 2221 } 2222 } 2223 if (reject) { 2224 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2225 continue; 2226 } 2227 } 2228 #endif 2229 else 2230 continue; 2231 } else { 2232 cp = ap->a_name; 2233 l1 = strlen(name); 2234 if (*cp == '*') { 2235 /* allow wildmatch */ 2236 cp++; 2237 l2 = strlen(cp); 2238 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2239 dprintf("rejected in rule %d due to name mismatch.\n", i); 2240 continue; 2241 } 2242 } else { 2243 /* exact match */ 2244 l2 = strlen(cp); 2245 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2246 dprintf("rejected in rule %d due to name mismatch.\n", i); 2247 continue; 2248 } 2249 } 2250 } 2251 dprintf("accepted in rule %d.\n", i); 2252 return (1); /* hooray! */ 2253 } 2254 return (0); 2255 } 2256 2257 /* 2258 * Fairly similar to popen(3), but returns an open descriptor, as 2259 * opposed to a FILE *. 2260 */ 2261 static int 2262 p_open(const char *prog, pid_t *pid) 2263 { 2264 int pfd[2], nulldesc, i; 2265 sigset_t omask, mask; 2266 char *argv[4]; /* sh -c cmd NULL */ 2267 char errmsg[200]; 2268 2269 if (pipe(pfd) == -1) 2270 return (-1); 2271 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2272 /* we are royally screwed anyway */ 2273 return (-1); 2274 2275 sigemptyset(&mask); 2276 sigaddset(&mask, SIGALRM); 2277 sigaddset(&mask, SIGHUP); 2278 sigprocmask(SIG_BLOCK, &mask, &omask); 2279 switch ((*pid = fork())) { 2280 case -1: 2281 sigprocmask(SIG_SETMASK, &omask, 0); 2282 close(nulldesc); 2283 return (-1); 2284 2285 case 0: 2286 argv[0] = strdup("sh"); 2287 argv[1] = strdup("-c"); 2288 argv[2] = strdup(prog); 2289 argv[3] = NULL; 2290 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2291 logerror("strdup"); 2292 exit(1); 2293 } 2294 2295 alarm(0); 2296 (void)setsid(); /* Avoid catching SIGHUPs. */ 2297 2298 /* 2299 * Throw away pending signals, and reset signal 2300 * behaviour to standard values. 2301 */ 2302 signal(SIGALRM, SIG_IGN); 2303 signal(SIGHUP, SIG_IGN); 2304 sigprocmask(SIG_SETMASK, &omask, 0); 2305 signal(SIGPIPE, SIG_DFL); 2306 signal(SIGQUIT, SIG_DFL); 2307 signal(SIGALRM, SIG_DFL); 2308 signal(SIGHUP, SIG_DFL); 2309 2310 dup2(pfd[0], STDIN_FILENO); 2311 dup2(nulldesc, STDOUT_FILENO); 2312 dup2(nulldesc, STDERR_FILENO); 2313 for (i = getdtablesize(); i > 2; i--) 2314 (void)close(i); 2315 2316 (void)execvp(_PATH_BSHELL, argv); 2317 _exit(255); 2318 } 2319 2320 sigprocmask(SIG_SETMASK, &omask, 0); 2321 close(nulldesc); 2322 close(pfd[0]); 2323 /* 2324 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2325 * supposed to get an EWOULDBLOCK on writev(2), which is 2326 * caught by the logic above anyway, which will in turn close 2327 * the pipe, and fork a new logging subprocess if necessary. 2328 * The stale subprocess will be killed some time later unless 2329 * it terminated itself due to closing its input pipe (so we 2330 * get rid of really dead puppies). 2331 */ 2332 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2333 /* This is bad. */ 2334 (void)snprintf(errmsg, sizeof errmsg, 2335 "Warning: cannot change pipe to PID %d to " 2336 "non-blocking behaviour.", 2337 (int)*pid); 2338 logerror(errmsg); 2339 } 2340 return (pfd[1]); 2341 } 2342 2343 static void 2344 deadq_enter(pid_t pid, const char *name) 2345 { 2346 dq_t p; 2347 int status; 2348 2349 /* 2350 * Be paranoid, if we can't signal the process, don't enter it 2351 * into the dead queue (perhaps it's already dead). If possible, 2352 * we try to fetch and log the child's status. 2353 */ 2354 if (kill(pid, 0) != 0) { 2355 if (waitpid(pid, &status, WNOHANG) > 0) 2356 log_deadchild(pid, status, name); 2357 return; 2358 } 2359 2360 p = malloc(sizeof(struct deadq_entry)); 2361 if (p == NULL) { 2362 logerror("malloc"); 2363 exit(1); 2364 } 2365 2366 p->dq_pid = pid; 2367 p->dq_timeout = DQ_TIMO_INIT; 2368 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2369 } 2370 2371 static int 2372 deadq_remove(pid_t pid) 2373 { 2374 dq_t q; 2375 2376 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2377 if (q->dq_pid == pid) { 2378 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2379 free(q); 2380 return (1); 2381 } 2382 } 2383 2384 return (0); 2385 } 2386 2387 static void 2388 log_deadchild(pid_t pid, int status, const char *name) 2389 { 2390 int code; 2391 char buf[256]; 2392 const char *reason; 2393 2394 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2395 if (WIFSIGNALED(status)) { 2396 reason = "due to signal"; 2397 code = WTERMSIG(status); 2398 } else { 2399 reason = "with status"; 2400 code = WEXITSTATUS(status); 2401 if (code == 0) 2402 return; 2403 } 2404 (void)snprintf(buf, sizeof buf, 2405 "Logging subprocess %d (%s) exited %s %d.", 2406 pid, name, reason, code); 2407 logerror(buf); 2408 } 2409 2410 static int * 2411 socksetup(int af, const char *bindhostname) 2412 { 2413 struct addrinfo hints, *res, *r; 2414 int error, maxs, *s, *socks; 2415 2416 memset(&hints, 0, sizeof(hints)); 2417 hints.ai_flags = AI_PASSIVE; 2418 hints.ai_family = af; 2419 hints.ai_socktype = SOCK_DGRAM; 2420 error = getaddrinfo(bindhostname, "syslog", &hints, &res); 2421 if (error) { 2422 logerror(gai_strerror(error)); 2423 errno = 0; 2424 die(0); 2425 } 2426 2427 /* Count max number of sockets we may open */ 2428 for (maxs = 0, r = res; r; r = r->ai_next, maxs++); 2429 socks = malloc((maxs+1) * sizeof(int)); 2430 if (socks == NULL) { 2431 logerror("couldn't allocate memory for sockets"); 2432 die(0); 2433 } 2434 2435 *socks = 0; /* num of sockets counter at start of array */ 2436 s = socks + 1; 2437 for (r = res; r; r = r->ai_next) { 2438 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol); 2439 if (*s < 0) { 2440 logerror("socket"); 2441 continue; 2442 } 2443 if (r->ai_family == AF_INET6) { 2444 int on = 1; 2445 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY, 2446 (char *)&on, sizeof (on)) < 0) { 2447 logerror("setsockopt"); 2448 close(*s); 2449 continue; 2450 } 2451 } 2452 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { 2453 close(*s); 2454 logerror("bind"); 2455 continue; 2456 } 2457 2458 (*socks)++; 2459 s++; 2460 } 2461 2462 if (*socks == 0) { 2463 free(socks); 2464 if (Debug) 2465 return (NULL); 2466 else 2467 die(0); 2468 } 2469 if (res) 2470 freeaddrinfo(res); 2471 2472 return (socks); 2473 } 2474