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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE MAXLINE /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 92 #include <netinet/in.h> 93 #include <netdb.h> 94 #include <arpa/inet.h> 95 96 #include <ctype.h> 97 #include <dirent.h> 98 #include <err.h> 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <libutil.h> 102 #include <limits.h> 103 #include <paths.h> 104 #include <signal.h> 105 #include <stdio.h> 106 #include <stdlib.h> 107 #include <string.h> 108 #include <sysexits.h> 109 #include <unistd.h> 110 #include <utmpx.h> 111 112 #include "pathnames.h" 113 #include "ttymsg.h" 114 115 #define SYSLOG_NAMES 116 #include <sys/syslog.h> 117 118 static const char *ConfFile = _PATH_LOGCONF; 119 static const char *PidFile = _PATH_LOGPID; 120 static const char ctty[] = _PATH_CONSOLE; 121 static const char include_str[] = "include"; 122 static const char include_ext[] = ".conf"; 123 124 #define dprintf if (Debug) printf 125 126 #define MAXUNAMES 20 /* maximum number of user names */ 127 128 #define sstosa(ss) ((struct sockaddr *)(ss)) 129 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 130 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 131 #define s6_addr32 __u6_addr.__u6_addr32 132 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 133 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 134 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 135 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 136 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 137 /* 138 * List of peers and sockets for binding. 139 */ 140 struct peer { 141 const char *pe_name; 142 const char *pe_serv; 143 mode_t pe_mode; 144 STAILQ_ENTRY(peer) next; 145 }; 146 struct socklist { 147 struct sockaddr_storage sl_ss; 148 int sl_socket; 149 struct peer *sl_peer; 150 STAILQ_ENTRY(socklist) next; 151 }; 152 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 153 154 static struct peer funix_secure = { 155 .pe_name = _PATH_LOG_PRIV, 156 .pe_mode = S_IRUSR | S_IWUSR, 157 .next = {NULL}, 158 }; 159 static struct peer funix_default = { 160 .pe_name = _PATH_LOG, 161 .pe_mode = DEFFILEMODE, 162 .next = {&funix_secure}, 163 }; 164 static STAILQ_HEAD(, peer) pqueue = { 165 &funix_default, 166 &funix_secure.next.stqe_next, 167 }; 168 169 /* 170 * Flags to logmsg(). 171 */ 172 173 #define IGN_CONS 0x001 /* don't print on console */ 174 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 175 #define ADDDATE 0x004 /* add a date to the message */ 176 #define MARK 0x008 /* this message is a mark */ 177 #define ISKERNEL 0x010 /* kernel generated message */ 178 179 /* 180 * This structure represents the files that will have log 181 * copies printed. 182 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 183 * or if f_type if F_PIPE and f_pid > 0. 184 */ 185 186 struct filed { 187 STAILQ_ENTRY(filed) next; /* next in linked list */ 188 short f_type; /* entry type, see below */ 189 short f_file; /* file descriptor */ 190 time_t f_time; /* time this was last written */ 191 char *f_host; /* host from which to recd. */ 192 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 193 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 194 #define PRI_LT 0x1 195 #define PRI_EQ 0x2 196 #define PRI_GT 0x4 197 char *f_program; /* program this applies to */ 198 union { 199 char f_uname[MAXUNAMES][MAXLOGNAME]; 200 struct { 201 char f_hname[MAXHOSTNAMELEN]; 202 struct addrinfo *f_addr; 203 204 } f_forw; /* forwarding address */ 205 char f_fname[MAXPATHLEN]; 206 struct { 207 char f_pname[MAXPATHLEN]; 208 pid_t f_pid; 209 } f_pipe; 210 } f_un; 211 #define fu_uname f_un.f_uname 212 #define fu_forw_hname f_un.f_forw.f_hname 213 #define fu_forw_addr f_un.f_forw.f_addr 214 #define fu_fname f_un.f_fname 215 #define fu_pipe_pname f_un.f_pipe.f_pname 216 #define fu_pipe_pid f_un.f_pipe.f_pid 217 char f_prevline[MAXSVLINE]; /* last message logged */ 218 char f_lasttime[16]; /* time of last occurrence */ 219 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 220 int f_prevpri; /* pri of f_prevline */ 221 int f_prevlen; /* length of f_prevline */ 222 int f_prevcount; /* repetition cnt of prevline */ 223 u_int f_repeatcount; /* number of "repeated" msgs */ 224 int f_flags; /* file-specific flags */ 225 #define FFLAG_SYNC 0x01 226 #define FFLAG_NEEDSYNC 0x02 227 }; 228 229 /* 230 * Queue of about-to-be dead processes we should watch out for. 231 */ 232 struct deadq_entry { 233 pid_t dq_pid; 234 int dq_timeout; 235 TAILQ_ENTRY(deadq_entry) dq_entries; 236 }; 237 static TAILQ_HEAD(, deadq_entry) deadq_head; 238 239 /* 240 * The timeout to apply to processes waiting on the dead queue. Unit 241 * of measure is `mark intervals', i.e. 20 minutes by default. 242 * Processes on the dead queue will be terminated after that time. 243 */ 244 245 #define DQ_TIMO_INIT 2 246 247 typedef struct deadq_entry *dq_t; 248 249 250 /* 251 * Struct to hold records of network addresses that are allowed to log 252 * to us. 253 */ 254 struct allowedpeer { 255 int isnumeric; 256 u_short port; 257 union { 258 struct { 259 struct sockaddr_storage addr; 260 struct sockaddr_storage mask; 261 } numeric; 262 char *name; 263 } u; 264 #define a_addr u.numeric.addr 265 #define a_mask u.numeric.mask 266 #define a_name u.name 267 STAILQ_ENTRY(allowedpeer) next; 268 }; 269 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 270 271 272 /* 273 * Intervals at which we flush out "message repeated" messages, 274 * in seconds after previous message is logged. After each flush, 275 * we move to the next interval until we reach the largest. 276 */ 277 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 278 #define MAXREPEAT ((sizeof(repeatinterval) / sizeof(repeatinterval[0])) - 1) 279 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 280 #define BACKOFF(f) { if (++(f)->f_repeatcount > MAXREPEAT) \ 281 (f)->f_repeatcount = MAXREPEAT; \ 282 } 283 284 /* values for f_type */ 285 #define F_UNUSED 0 /* unused entry */ 286 #define F_FILE 1 /* regular file */ 287 #define F_TTY 2 /* terminal */ 288 #define F_CONSOLE 3 /* console terminal */ 289 #define F_FORW 4 /* remote machine */ 290 #define F_USERS 5 /* list of users */ 291 #define F_WALL 6 /* everyone logged on */ 292 #define F_PIPE 7 /* pipe to program */ 293 294 static const char *TypeNames[8] = { 295 "UNUSED", "FILE", "TTY", "CONSOLE", 296 "FORW", "USERS", "WALL", "PIPE" 297 }; 298 299 static STAILQ_HEAD(, filed) fhead = 300 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 301 static struct filed consfile; /* Console */ 302 303 static int Debug; /* debug flag */ 304 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 305 static int resolve = 1; /* resolve hostname */ 306 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 307 static const char *LocalDomain; /* our local domain name */ 308 static int fklog = -1; /* /dev/klog */ 309 static int Initialized; /* set when we have initialized ourselves */ 310 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 311 static int MarkSeq; /* mark sequence number */ 312 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 313 static int SecureMode; /* when true, receive only unix domain socks */ 314 #ifdef INET6 315 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 316 #else 317 static int family = PF_INET; /* protocol family (IPv4 only) */ 318 #endif 319 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 320 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 321 static int use_bootfile; /* log entire bootfile for every kern msg */ 322 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 323 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 324 325 static char bootfile[MAXLINE+1]; /* booted kernel file */ 326 327 static int RemoteAddDate; /* Always set the date on remote messages */ 328 329 static int UniquePriority; /* Only log specified priority? */ 330 static int LogFacPri; /* Put facility and priority in log message: */ 331 /* 0=no, 1=numeric, 2=names */ 332 static int KeepKernFac; /* Keep remotely logged kernel facility */ 333 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 334 static struct pidfh *pfh; 335 336 static volatile sig_atomic_t MarkSet, WantDie; 337 338 static int allowaddr(char *); 339 static void cfline(const char *, struct filed *, 340 const char *, const char *); 341 static const char *cvthname(struct sockaddr *); 342 static void deadq_enter(pid_t, const char *); 343 static int deadq_remove(pid_t); 344 static int decode(const char *, const CODE *); 345 static void die(int) __dead2; 346 static void dodie(int); 347 static void dofsync(void); 348 static void domark(int); 349 static void fprintlog(struct filed *, int, const char *); 350 static void init(int); 351 static void logerror(const char *); 352 static void logmsg(int, const char *, const char *, int); 353 static void log_deadchild(pid_t, int, const char *); 354 static void markit(void); 355 static int socksetup(struct peer *); 356 static int skip_message(const char *, const char *, int); 357 static void printline(const char *, char *, int); 358 static void printsys(char *); 359 static int p_open(const char *, pid_t *); 360 static void readklog(void); 361 static void reapchild(int); 362 static const char *ttymsg_check(struct iovec *, int, char *, int); 363 static void usage(void); 364 static int validate(struct sockaddr *, const char *); 365 static void unmapped(struct sockaddr *); 366 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 367 static int waitdaemon(int, int, int); 368 static void timedout(int); 369 static void increase_rcvbuf(int); 370 371 static void 372 close_filed(struct filed *f) 373 { 374 375 if (f == NULL || f->f_file == -1) 376 return; 377 378 (void)close(f->f_file); 379 f->f_file = -1; 380 f->f_type = F_UNUSED; 381 } 382 383 int 384 main(int argc, char *argv[]) 385 { 386 int ch, i, fdsrmax = 0, bflag = 0; 387 struct sockaddr_storage ss; 388 fd_set *fdsr = NULL; 389 char line[MAXLINE + 1]; 390 const char *hname; 391 struct timeval tv, *tvp; 392 struct sigaction sact; 393 struct peer *pe; 394 struct socklist *sl; 395 sigset_t mask; 396 pid_t ppid = 1, spid; 397 socklen_t sslen; 398 char *p; 399 400 if (madvise(NULL, 0, MADV_PROTECT) != 0) 401 dprintf("madvise() failed: %s\n", strerror(errno)); 402 403 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 404 != -1) 405 switch (ch) { 406 #ifdef INET 407 case '4': 408 family = PF_INET; 409 break; 410 #endif 411 #ifdef INET6 412 case '6': 413 family = PF_INET6; 414 break; 415 #endif 416 case '8': 417 mask_C1 = 0; 418 break; 419 case 'A': 420 send_to_all++; 421 break; 422 case 'a': /* allow specific network addresses only */ 423 if (allowaddr(optarg) == -1) 424 usage(); 425 break; 426 case 'b': 427 if ((pe = calloc(1, sizeof(*pe))) == NULL) 428 err(1, "malloc failed"); 429 if ((p = strchr(optarg, ':')) == NULL) { 430 /* A hostname or filename only. */ 431 pe->pe_name = optarg; 432 pe->pe_serv = "syslog"; 433 } else { 434 /* The case of "name:service". */ 435 *p++ = '\0'; 436 pe->pe_serv = p; 437 pe->pe_name = (strlen(optarg) == 0) ? 438 NULL : optarg; 439 } 440 bflag = 1; 441 STAILQ_INSERT_TAIL(&pqueue, pe, next); 442 break; 443 case 'c': 444 no_compress++; 445 break; 446 case 'C': 447 logflags |= O_CREAT; 448 break; 449 case 'd': /* debug */ 450 Debug++; 451 break; 452 case 'f': /* configuration file */ 453 ConfFile = optarg; 454 break; 455 case 'F': /* run in foreground instead of daemon */ 456 Foreground++; 457 break; 458 case 'k': /* keep remote kern fac */ 459 KeepKernFac = 1; 460 break; 461 case 'l': 462 { 463 long perml; 464 mode_t mode; 465 char *name, *ep; 466 467 if (optarg[0] == '/') { 468 mode = DEFFILEMODE; 469 name = optarg; 470 } else if ((name = strchr(optarg, ':')) != NULL) { 471 *name++ = '\0'; 472 if (name[0] != '/') 473 errx(1, "socket name must be absolute " 474 "path"); 475 if (isdigit(*optarg)) { 476 perml = strtol(optarg, &ep, 8); 477 if (*ep || perml < 0 || 478 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 479 errx(1, "invalid mode %s, exiting", 480 optarg); 481 mode = (mode_t )perml; 482 } else 483 errx(1, "invalid mode %s, exiting", 484 optarg); 485 } 486 if ((pe = calloc(1, sizeof(*pe))) == NULL) 487 err(1, "malloc failed"); 488 pe->pe_name = name; 489 pe->pe_mode = mode; 490 STAILQ_INSERT_TAIL(&pqueue, pe, next); 491 break; 492 } 493 case 'm': /* mark interval */ 494 MarkInterval = atoi(optarg) * 60; 495 break; 496 case 'N': 497 NoBind = 1; 498 SecureMode = 1; 499 break; 500 case 'n': 501 resolve = 0; 502 break; 503 case 'o': 504 use_bootfile = 1; 505 break; 506 case 'p': /* path */ 507 funix_default.pe_name = optarg; 508 break; 509 case 'P': /* path for alt. PID */ 510 PidFile = optarg; 511 break; 512 case 's': /* no network mode */ 513 SecureMode++; 514 break; 515 case 'S': /* path for privileged originator */ 516 funix_secure.pe_name = optarg; 517 break; 518 case 'T': 519 RemoteAddDate = 1; 520 break; 521 case 'u': /* only log specified priority */ 522 UniquePriority++; 523 break; 524 case 'v': /* log facility and priority */ 525 LogFacPri++; 526 break; 527 default: 528 usage(); 529 } 530 if ((argc -= optind) != 0) 531 usage(); 532 533 if (bflag == 0) { 534 pe = calloc(1, sizeof(*pe)); 535 if (pe == NULL) 536 err(1, "malloc failed"); 537 *pe = (struct peer) { 538 .pe_serv = "syslog" 539 }; 540 STAILQ_INSERT_TAIL(&pqueue, pe, next); 541 } 542 STAILQ_FOREACH(pe, &pqueue, next) 543 socksetup(pe); 544 545 pfh = pidfile_open(PidFile, 0600, &spid); 546 if (pfh == NULL) { 547 if (errno == EEXIST) 548 errx(1, "syslogd already running, pid: %d", spid); 549 warn("cannot open pid file"); 550 } 551 552 if ((!Foreground) && (!Debug)) { 553 ppid = waitdaemon(0, 0, 30); 554 if (ppid < 0) { 555 warn("could not become daemon"); 556 pidfile_remove(pfh); 557 exit(1); 558 } 559 } else if (Debug) 560 setlinebuf(stdout); 561 562 consfile.f_type = F_CONSOLE; 563 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 564 sizeof(consfile.fu_fname)); 565 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 566 (void)signal(SIGTERM, dodie); 567 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 568 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 569 /* 570 * We don't want the SIGCHLD and SIGHUP handlers to interfere 571 * with each other; they are likely candidates for being called 572 * simultaneously (SIGHUP closes pipe descriptor, process dies, 573 * SIGCHLD happens). 574 */ 575 sigemptyset(&mask); 576 sigaddset(&mask, SIGHUP); 577 sact.sa_handler = reapchild; 578 sact.sa_mask = mask; 579 sact.sa_flags = SA_RESTART; 580 (void)sigaction(SIGCHLD, &sact, NULL); 581 (void)signal(SIGALRM, domark); 582 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 583 (void)alarm(TIMERINTVL); 584 585 TAILQ_INIT(&deadq_head); 586 587 if ((fklog = open(_PATH_KLOG, O_RDONLY|O_NONBLOCK, 0)) < 0) 588 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 589 590 /* tuck my process id away */ 591 pidfile_write(pfh); 592 593 dprintf("off & running....\n"); 594 595 init(0); 596 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 597 sigemptyset(&mask); 598 sigaddset(&mask, SIGCHLD); 599 sact.sa_handler = init; 600 sact.sa_mask = mask; 601 sact.sa_flags = SA_RESTART; 602 (void)sigaction(SIGHUP, &sact, NULL); 603 604 tvp = &tv; 605 tv.tv_sec = tv.tv_usec = 0; 606 607 if (fklog != -1 && fklog > fdsrmax) 608 fdsrmax = fklog; 609 STAILQ_FOREACH(sl, &shead, next) { 610 if (sl->sl_socket > fdsrmax) 611 fdsrmax = sl->sl_socket; 612 } 613 614 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 615 sizeof(fd_mask)); 616 if (fdsr == NULL) 617 errx(1, "calloc fd_set"); 618 619 for (;;) { 620 if (MarkSet) 621 markit(); 622 if (WantDie) 623 die(WantDie); 624 625 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 626 sizeof(fd_mask)); 627 628 if (fklog != -1) 629 FD_SET(fklog, fdsr); 630 STAILQ_FOREACH(sl, &shead, next) { 631 if (sl->sl_socket != -1) 632 FD_SET(sl->sl_socket, fdsr); 633 } 634 i = select(fdsrmax + 1, fdsr, NULL, NULL, 635 needdofsync ? &tv : tvp); 636 switch (i) { 637 case 0: 638 dofsync(); 639 needdofsync = 0; 640 if (tvp) { 641 tvp = NULL; 642 if (ppid != 1) 643 kill(ppid, SIGALRM); 644 } 645 continue; 646 case -1: 647 if (errno != EINTR) 648 logerror("select"); 649 continue; 650 } 651 if (fklog != -1 && FD_ISSET(fklog, fdsr)) 652 readklog(); 653 STAILQ_FOREACH(sl, &shead, next) { 654 int date, len; 655 656 if (FD_ISSET(sl->sl_socket, fdsr)) { 657 sslen = sizeof(ss); 658 dprintf("sslen(1) = %d\n", sslen); 659 len = recvfrom(sl->sl_socket, line, 660 sizeof(line) - 1, 0, 661 sstosa(&ss), &sslen); 662 dprintf("sslen(2) = %d\n", sslen); 663 if (len == 0) 664 continue; 665 if (len < 0) { 666 if (errno != EINTR) 667 logerror("recvfrom"); 668 continue; 669 } 670 /* Received valid data. */ 671 line[len] = '\0'; 672 if (sl->sl_ss.ss_family == AF_LOCAL) { 673 hname = LocalHostName; 674 date = 0; 675 } else { 676 hname = cvthname(sstosa(&ss)); 677 unmapped(sstosa(&ss)); 678 if (validate(sstosa(&ss), hname) == 0) 679 hname = NULL; 680 date = RemoteAddDate ? ADDDATE : 0; 681 } 682 if (hname != NULL) 683 printline(hname, line, date); 684 else 685 dprintf("Invalid msg from " 686 "%s was ignored.", hname); 687 } 688 } 689 } 690 if (fdsr) 691 free(fdsr); 692 } 693 694 static void 695 unmapped(struct sockaddr *sa) 696 { 697 struct sockaddr_in6 *sin6; 698 struct sockaddr_in sin4; 699 700 if (sa == NULL || 701 sa->sa_family != AF_INET6 || 702 sa->sa_len != sizeof(*sin6)) 703 return; 704 sin6 = satosin6(sa); 705 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 706 return; 707 708 memset(&sin4, 0, sizeof(sin4)); 709 sin4.sin_family = AF_INET; 710 sin4.sin_len = sizeof(sin4); 711 memcpy(&sin4.sin_addr, &sin6->sin6_addr.s6_addr[12], 712 sizeof(sin4.sin_addr)); 713 sin4.sin_port = sin6->sin6_port; 714 715 memcpy(sa, &sin4, sin4.sin_len); 716 } 717 718 static void 719 usage(void) 720 { 721 722 fprintf(stderr, "%s\n%s\n%s\n%s\n", 723 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 724 " [-b bind_address] [-f config_file]", 725 " [-l [mode:]path] [-m mark_interval]", 726 " [-P pid_file] [-p log_socket]"); 727 exit(1); 728 } 729 730 /* 731 * Take a raw input line, decode the message, and print the message 732 * on the appropriate log files. 733 */ 734 static void 735 printline(const char *hname, char *msg, int flags) 736 { 737 char *p, *q; 738 long n; 739 int c, pri; 740 char line[MAXLINE + 1]; 741 742 /* test for special codes */ 743 p = msg; 744 pri = DEFUPRI; 745 if (*p == '<') { 746 errno = 0; 747 n = strtol(p + 1, &q, 10); 748 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 749 p = q + 1; 750 pri = n; 751 } 752 } 753 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 754 pri = DEFUPRI; 755 756 /* 757 * Don't allow users to log kernel messages. 758 * NOTE: since LOG_KERN == 0 this will also match 759 * messages with no facility specified. 760 */ 761 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 762 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 763 764 q = line; 765 766 while ((c = (unsigned char)*p++) != '\0' && 767 q < &line[sizeof(line) - 4]) { 768 if (mask_C1 && (c & 0x80) && c < 0xA0) { 769 c &= 0x7F; 770 *q++ = 'M'; 771 *q++ = '-'; 772 } 773 if (isascii(c) && iscntrl(c)) { 774 if (c == '\n') { 775 *q++ = ' '; 776 } else if (c == '\t') { 777 *q++ = '\t'; 778 } else { 779 *q++ = '^'; 780 *q++ = c ^ 0100; 781 } 782 } else { 783 *q++ = c; 784 } 785 } 786 *q = '\0'; 787 788 logmsg(pri, line, hname, flags); 789 } 790 791 /* 792 * Read /dev/klog while data are available, split into lines. 793 */ 794 static void 795 readklog(void) 796 { 797 char *p, *q, line[MAXLINE + 1]; 798 int len, i; 799 800 len = 0; 801 for (;;) { 802 i = read(fklog, line + len, MAXLINE - 1 - len); 803 if (i > 0) { 804 line[i + len] = '\0'; 805 } else { 806 if (i < 0 && errno != EINTR && errno != EAGAIN) { 807 logerror("klog"); 808 fklog = -1; 809 } 810 break; 811 } 812 813 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 814 *q = '\0'; 815 printsys(p); 816 } 817 len = strlen(p); 818 if (len >= MAXLINE - 1) { 819 printsys(p); 820 len = 0; 821 } 822 if (len > 0) 823 memmove(line, p, len + 1); 824 } 825 if (len > 0) 826 printsys(line); 827 } 828 829 /* 830 * Take a raw input line from /dev/klog, format similar to syslog(). 831 */ 832 static void 833 printsys(char *msg) 834 { 835 char *p, *q; 836 long n; 837 int flags, isprintf, pri; 838 839 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 840 p = msg; 841 pri = DEFSPRI; 842 isprintf = 1; 843 if (*p == '<') { 844 errno = 0; 845 n = strtol(p + 1, &q, 10); 846 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 847 p = q + 1; 848 pri = n; 849 isprintf = 0; 850 } 851 } 852 /* 853 * Kernel printf's and LOG_CONSOLE messages have been displayed 854 * on the console already. 855 */ 856 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 857 flags |= IGN_CONS; 858 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 859 pri = DEFSPRI; 860 logmsg(pri, p, LocalHostName, flags); 861 } 862 863 static time_t now; 864 865 /* 866 * Match a program or host name against a specification. 867 * Return a non-0 value if the message must be ignored 868 * based on the specification. 869 */ 870 static int 871 skip_message(const char *name, const char *spec, int checkcase) 872 { 873 const char *s; 874 char prev, next; 875 int exclude = 0; 876 /* Behaviour on explicit match */ 877 878 if (spec == NULL) 879 return 0; 880 switch (*spec) { 881 case '-': 882 exclude = 1; 883 /*FALLTHROUGH*/ 884 case '+': 885 spec++; 886 break; 887 default: 888 break; 889 } 890 if (checkcase) 891 s = strstr (spec, name); 892 else 893 s = strcasestr (spec, name); 894 895 if (s != NULL) { 896 prev = (s == spec ? ',' : *(s - 1)); 897 next = *(s + strlen (name)); 898 899 if (prev == ',' && (next == '\0' || next == ',')) 900 /* Explicit match: skip iff the spec is an 901 exclusive one. */ 902 return exclude; 903 } 904 905 /* No explicit match for this name: skip the message iff 906 the spec is an inclusive one. */ 907 return !exclude; 908 } 909 910 /* 911 * Log a message to the appropriate log files, users, etc. based on 912 * the priority. 913 */ 914 static void 915 logmsg(int pri, const char *msg, const char *from, int flags) 916 { 917 struct filed *f; 918 int i, fac, msglen, omask, prilev; 919 const char *timestamp; 920 char prog[NAME_MAX+1]; 921 char buf[MAXLINE+1]; 922 923 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 924 pri, flags, from, msg); 925 926 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 927 928 /* 929 * Check to see if msg looks non-standard. 930 */ 931 msglen = strlen(msg); 932 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 933 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 934 flags |= ADDDATE; 935 936 (void)time(&now); 937 if (flags & ADDDATE) { 938 timestamp = ctime(&now) + 4; 939 } else { 940 timestamp = msg; 941 msg += 16; 942 msglen -= 16; 943 } 944 945 /* skip leading blanks */ 946 while (isspace(*msg)) { 947 msg++; 948 msglen--; 949 } 950 951 /* extract facility and priority level */ 952 if (flags & MARK) 953 fac = LOG_NFACILITIES; 954 else 955 fac = LOG_FAC(pri); 956 957 /* Check maximum facility number. */ 958 if (fac > LOG_NFACILITIES) { 959 (void)sigsetmask(omask); 960 return; 961 } 962 963 prilev = LOG_PRI(pri); 964 965 /* extract program name */ 966 for (i = 0; i < NAME_MAX; i++) { 967 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 968 msg[i] == '/' || isspace(msg[i])) 969 break; 970 prog[i] = msg[i]; 971 } 972 prog[i] = 0; 973 974 /* add kernel prefix for kernel messages */ 975 if (flags & ISKERNEL) { 976 snprintf(buf, sizeof(buf), "%s: %s", 977 use_bootfile ? bootfile : "kernel", msg); 978 msg = buf; 979 msglen = strlen(buf); 980 } 981 982 /* log the message to the particular outputs */ 983 if (!Initialized) { 984 f = &consfile; 985 /* 986 * Open in non-blocking mode to avoid hangs during open 987 * and close(waiting for the port to drain). 988 */ 989 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 990 991 if (f->f_file >= 0) { 992 (void)strlcpy(f->f_lasttime, timestamp, 993 sizeof(f->f_lasttime)); 994 fprintlog(f, flags, msg); 995 close(f->f_file); 996 f->f_file = -1; 997 } 998 (void)sigsetmask(omask); 999 return; 1000 } 1001 STAILQ_FOREACH(f, &fhead, next) { 1002 /* skip messages that are incorrect priority */ 1003 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1004 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1005 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1006 ) 1007 || f->f_pmask[fac] == INTERNAL_NOPRI) 1008 continue; 1009 1010 /* skip messages with the incorrect hostname */ 1011 if (skip_message(from, f->f_host, 0)) 1012 continue; 1013 1014 /* skip messages with the incorrect program name */ 1015 if (skip_message(prog, f->f_program, 1)) 1016 continue; 1017 1018 /* skip message to console if it has already been printed */ 1019 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1020 continue; 1021 1022 /* don't output marks to recently written files */ 1023 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1024 continue; 1025 1026 /* 1027 * suppress duplicate lines to this file 1028 */ 1029 if (no_compress - (f->f_type != F_PIPE) < 1 && 1030 (flags & MARK) == 0 && msglen == f->f_prevlen && 1031 !strcmp(msg, f->f_prevline) && 1032 !strcasecmp(from, f->f_prevhost)) { 1033 (void)strlcpy(f->f_lasttime, timestamp, 1034 sizeof(f->f_lasttime)); 1035 f->f_prevcount++; 1036 dprintf("msg repeated %d times, %ld sec of %d\n", 1037 f->f_prevcount, (long)(now - f->f_time), 1038 repeatinterval[f->f_repeatcount]); 1039 /* 1040 * If domark would have logged this by now, 1041 * flush it now (so we don't hold isolated messages), 1042 * but back off so we'll flush less often 1043 * in the future. 1044 */ 1045 if (now > REPEATTIME(f)) { 1046 fprintlog(f, flags, (char *)NULL); 1047 BACKOFF(f); 1048 } 1049 } else { 1050 /* new line, save it */ 1051 if (f->f_prevcount) 1052 fprintlog(f, 0, (char *)NULL); 1053 f->f_repeatcount = 0; 1054 f->f_prevpri = pri; 1055 (void)strlcpy(f->f_lasttime, timestamp, 1056 sizeof(f->f_lasttime)); 1057 (void)strlcpy(f->f_prevhost, from, 1058 sizeof(f->f_prevhost)); 1059 if (msglen < MAXSVLINE) { 1060 f->f_prevlen = msglen; 1061 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1062 fprintlog(f, flags, (char *)NULL); 1063 } else { 1064 f->f_prevline[0] = 0; 1065 f->f_prevlen = 0; 1066 fprintlog(f, flags, msg); 1067 } 1068 } 1069 } 1070 (void)sigsetmask(omask); 1071 } 1072 1073 static void 1074 dofsync(void) 1075 { 1076 struct filed *f; 1077 1078 STAILQ_FOREACH(f, &fhead, next) { 1079 if ((f->f_type == F_FILE) && 1080 (f->f_flags & FFLAG_NEEDSYNC)) { 1081 f->f_flags &= ~FFLAG_NEEDSYNC; 1082 (void)fsync(f->f_file); 1083 } 1084 } 1085 } 1086 1087 #define IOV_SIZE 7 1088 static void 1089 fprintlog(struct filed *f, int flags, const char *msg) 1090 { 1091 struct iovec iov[IOV_SIZE]; 1092 struct iovec *v; 1093 struct addrinfo *r; 1094 int l, lsent = 0; 1095 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1096 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1097 const char *msgret; 1098 1099 v = iov; 1100 if (f->f_type == F_WALL) { 1101 v->iov_base = greetings; 1102 /* The time displayed is not synchornized with the other log 1103 * destinations (like messages). Following fragment was using 1104 * ctime(&now), which was updating the time every 30 sec. 1105 * With f_lasttime, time is synchronized correctly. 1106 */ 1107 v->iov_len = snprintf(greetings, sizeof greetings, 1108 "\r\n\7Message from syslogd@%s at %.24s ...\r\n", 1109 f->f_prevhost, f->f_lasttime); 1110 if (v->iov_len >= sizeof greetings) 1111 v->iov_len = sizeof greetings - 1; 1112 v++; 1113 v->iov_base = nul; 1114 v->iov_len = 0; 1115 v++; 1116 } else { 1117 v->iov_base = f->f_lasttime; 1118 v->iov_len = strlen(f->f_lasttime); 1119 v++; 1120 v->iov_base = space; 1121 v->iov_len = 1; 1122 v++; 1123 } 1124 1125 if (LogFacPri) { 1126 static char fp_buf[30]; /* Hollow laugh */ 1127 int fac = f->f_prevpri & LOG_FACMASK; 1128 int pri = LOG_PRI(f->f_prevpri); 1129 const char *f_s = NULL; 1130 char f_n[5]; /* Hollow laugh */ 1131 const char *p_s = NULL; 1132 char p_n[5]; /* Hollow laugh */ 1133 1134 if (LogFacPri > 1) { 1135 const CODE *c; 1136 1137 for (c = facilitynames; c->c_name; c++) { 1138 if (c->c_val == fac) { 1139 f_s = c->c_name; 1140 break; 1141 } 1142 } 1143 for (c = prioritynames; c->c_name; c++) { 1144 if (c->c_val == pri) { 1145 p_s = c->c_name; 1146 break; 1147 } 1148 } 1149 } 1150 if (!f_s) { 1151 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1152 f_s = f_n; 1153 } 1154 if (!p_s) { 1155 snprintf(p_n, sizeof p_n, "%d", pri); 1156 p_s = p_n; 1157 } 1158 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1159 v->iov_base = fp_buf; 1160 v->iov_len = strlen(fp_buf); 1161 } else { 1162 v->iov_base = nul; 1163 v->iov_len = 0; 1164 } 1165 v++; 1166 1167 v->iov_base = f->f_prevhost; 1168 v->iov_len = strlen(v->iov_base); 1169 v++; 1170 v->iov_base = space; 1171 v->iov_len = 1; 1172 v++; 1173 1174 if (msg) { 1175 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1176 if (wmsg == NULL) { 1177 logerror("strdup"); 1178 exit(1); 1179 } 1180 v->iov_base = wmsg; 1181 v->iov_len = strlen(msg); 1182 } else if (f->f_prevcount > 1) { 1183 v->iov_base = repbuf; 1184 v->iov_len = snprintf(repbuf, sizeof repbuf, 1185 "last message repeated %d times", f->f_prevcount); 1186 } else { 1187 v->iov_base = f->f_prevline; 1188 v->iov_len = f->f_prevlen; 1189 } 1190 v++; 1191 1192 dprintf("Logging to %s", TypeNames[f->f_type]); 1193 f->f_time = now; 1194 1195 switch (f->f_type) { 1196 int port; 1197 case F_UNUSED: 1198 dprintf("\n"); 1199 break; 1200 1201 case F_FORW: 1202 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1203 if (port != 514) { 1204 dprintf(" %s:%d\n", f->fu_forw_hname, port); 1205 } else { 1206 dprintf(" %s\n", f->fu_forw_hname); 1207 } 1208 /* check for local vs remote messages */ 1209 if (strcasecmp(f->f_prevhost, LocalHostName)) 1210 l = snprintf(line, sizeof line - 1, 1211 "<%d>%.15s Forwarded from %s: %s", 1212 f->f_prevpri, (char *)iov[0].iov_base, 1213 f->f_prevhost, (char *)iov[5].iov_base); 1214 else 1215 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1216 f->f_prevpri, (char *)iov[0].iov_base, 1217 (char *)iov[5].iov_base); 1218 if (l < 0) 1219 l = 0; 1220 else if (l > MAXLINE) 1221 l = MAXLINE; 1222 1223 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1224 struct socklist *sl; 1225 1226 STAILQ_FOREACH(sl, &shead, next) { 1227 if (sl->sl_ss.ss_family == AF_LOCAL) 1228 continue; 1229 lsent = sendto(sl->sl_socket, line, l, 0, 1230 r->ai_addr, r->ai_addrlen); 1231 if (lsent == l) 1232 break; 1233 } 1234 if (lsent == l && !send_to_all) 1235 break; 1236 } 1237 dprintf("lsent/l: %d/%d\n", lsent, l); 1238 if (lsent != l) { 1239 int e = errno; 1240 logerror("sendto"); 1241 errno = e; 1242 switch (errno) { 1243 case ENOBUFS: 1244 case ENETDOWN: 1245 case ENETUNREACH: 1246 case EHOSTUNREACH: 1247 case EHOSTDOWN: 1248 case EADDRNOTAVAIL: 1249 break; 1250 /* case EBADF: */ 1251 /* case EACCES: */ 1252 /* case ENOTSOCK: */ 1253 /* case EFAULT: */ 1254 /* case EMSGSIZE: */ 1255 /* case EAGAIN: */ 1256 /* case ENOBUFS: */ 1257 /* case ECONNREFUSED: */ 1258 default: 1259 dprintf("removing entry: errno=%d\n", e); 1260 f->f_type = F_UNUSED; 1261 break; 1262 } 1263 } 1264 break; 1265 1266 case F_FILE: 1267 dprintf(" %s\n", f->fu_fname); 1268 v->iov_base = lf; 1269 v->iov_len = 1; 1270 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1271 /* 1272 * If writev(2) fails for potentially transient errors 1273 * like the filesystem being full, ignore it. 1274 * Otherwise remove this logfile from the list. 1275 */ 1276 if (errno != ENOSPC) { 1277 int e = errno; 1278 close_filed(f); 1279 errno = e; 1280 logerror(f->fu_fname); 1281 } 1282 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1283 f->f_flags |= FFLAG_NEEDSYNC; 1284 needdofsync = 1; 1285 } 1286 break; 1287 1288 case F_PIPE: 1289 dprintf(" %s\n", f->fu_pipe_pname); 1290 v->iov_base = lf; 1291 v->iov_len = 1; 1292 if (f->fu_pipe_pid == 0) { 1293 if ((f->f_file = p_open(f->fu_pipe_pname, 1294 &f->fu_pipe_pid)) < 0) { 1295 f->f_type = F_UNUSED; 1296 logerror(f->fu_pipe_pname); 1297 break; 1298 } 1299 } 1300 if (writev(f->f_file, iov, IOV_SIZE) < 0) { 1301 int e = errno; 1302 close_filed(f); 1303 if (f->fu_pipe_pid > 0) 1304 deadq_enter(f->fu_pipe_pid, 1305 f->fu_pipe_pname); 1306 f->fu_pipe_pid = 0; 1307 errno = e; 1308 logerror(f->fu_pipe_pname); 1309 } 1310 break; 1311 1312 case F_CONSOLE: 1313 if (flags & IGN_CONS) { 1314 dprintf(" (ignored)\n"); 1315 break; 1316 } 1317 /* FALLTHROUGH */ 1318 1319 case F_TTY: 1320 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1321 v->iov_base = crlf; 1322 v->iov_len = 2; 1323 1324 errno = 0; /* ttymsg() only sometimes returns an errno */ 1325 if ((msgret = ttymsg(iov, IOV_SIZE, f->fu_fname, 10))) { 1326 f->f_type = F_UNUSED; 1327 logerror(msgret); 1328 } 1329 break; 1330 1331 case F_USERS: 1332 case F_WALL: 1333 dprintf("\n"); 1334 v->iov_base = crlf; 1335 v->iov_len = 2; 1336 wallmsg(f, iov, IOV_SIZE); 1337 break; 1338 } 1339 f->f_prevcount = 0; 1340 free(wmsg); 1341 } 1342 1343 /* 1344 * WALLMSG -- Write a message to the world at large 1345 * 1346 * Write the specified message to either the entire 1347 * world, or a list of approved users. 1348 */ 1349 static void 1350 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1351 { 1352 static int reenter; /* avoid calling ourselves */ 1353 struct utmpx *ut; 1354 int i; 1355 const char *p; 1356 1357 if (reenter++) 1358 return; 1359 setutxent(); 1360 /* NOSTRICT */ 1361 while ((ut = getutxent()) != NULL) { 1362 if (ut->ut_type != USER_PROCESS) 1363 continue; 1364 if (f->f_type == F_WALL) { 1365 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1366 TTYMSGTIME)) != NULL) { 1367 errno = 0; /* already in msg */ 1368 logerror(p); 1369 } 1370 continue; 1371 } 1372 /* should we send the message to this user? */ 1373 for (i = 0; i < MAXUNAMES; i++) { 1374 if (!f->fu_uname[i][0]) 1375 break; 1376 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1377 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1378 TTYMSGTIME)) != NULL) { 1379 errno = 0; /* already in msg */ 1380 logerror(p); 1381 } 1382 break; 1383 } 1384 } 1385 } 1386 endutxent(); 1387 reenter = 0; 1388 } 1389 1390 /* 1391 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1392 */ 1393 static const char * 1394 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1395 { 1396 static char device[1024]; 1397 static char errbuf[1024]; 1398 struct stat sb; 1399 1400 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1401 1402 if (stat(device, &sb) < 0) { 1403 (void) snprintf(errbuf, sizeof(errbuf), 1404 "%s: %s", device, strerror(errno)); 1405 return (errbuf); 1406 } 1407 if ((sb.st_mode & S_IWGRP) == 0) 1408 /* Messages disabled. */ 1409 return (NULL); 1410 return ttymsg(iov, iovcnt, line, tmout); 1411 } 1412 1413 static void 1414 reapchild(int signo __unused) 1415 { 1416 int status; 1417 pid_t pid; 1418 struct filed *f; 1419 1420 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1421 if (!Initialized) 1422 /* Don't tell while we are initting. */ 1423 continue; 1424 1425 /* First, look if it's a process from the dead queue. */ 1426 if (deadq_remove(pid)) 1427 continue; 1428 1429 /* Now, look in list of active processes. */ 1430 STAILQ_FOREACH(f, &fhead, next) { 1431 if (f->f_type == F_PIPE && 1432 f->fu_pipe_pid == pid) { 1433 close_filed(f); 1434 f->fu_pipe_pid = 0; 1435 log_deadchild(pid, status, f->fu_pipe_pname); 1436 break; 1437 } 1438 } 1439 } 1440 } 1441 1442 /* 1443 * Return a printable representation of a host address. 1444 */ 1445 static const char * 1446 cvthname(struct sockaddr *f) 1447 { 1448 int error, hl; 1449 sigset_t omask, nmask; 1450 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1451 1452 dprintf("cvthname(%d) len = %d, %zu\n", f->sa_family, f->sa_len, sizeof(struct sockaddr_in6)); 1453 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1454 NI_NUMERICHOST); 1455 dprintf("cvthname(%s)\n", ip); 1456 1457 if (error) { 1458 dprintf("Malformed from address %s\n", gai_strerror(error)); 1459 return ("???"); 1460 } 1461 if (!resolve) 1462 return (ip); 1463 1464 sigemptyset(&nmask); 1465 sigaddset(&nmask, SIGHUP); 1466 sigprocmask(SIG_BLOCK, &nmask, &omask); 1467 error = getnameinfo((struct sockaddr *)f, 1468 ((struct sockaddr *)f)->sa_len, 1469 hname, sizeof hname, NULL, 0, NI_NAMEREQD); 1470 sigprocmask(SIG_SETMASK, &omask, NULL); 1471 if (error) { 1472 dprintf("Host name for your address (%s) unknown\n", ip); 1473 return (ip); 1474 } 1475 hl = strlen(hname); 1476 if (hl > 0 && hname[hl-1] == '.') 1477 hname[--hl] = '\0'; 1478 trimdomain(hname, hl); 1479 return (hname); 1480 } 1481 1482 static void 1483 dodie(int signo) 1484 { 1485 1486 WantDie = signo; 1487 } 1488 1489 static void 1490 domark(int signo __unused) 1491 { 1492 1493 MarkSet = 1; 1494 } 1495 1496 /* 1497 * Print syslogd errors some place. 1498 */ 1499 static void 1500 logerror(const char *type) 1501 { 1502 char buf[512]; 1503 static int recursed = 0; 1504 1505 /* If there's an error while trying to log an error, give up. */ 1506 if (recursed) 1507 return; 1508 recursed++; 1509 if (errno) 1510 (void)snprintf(buf, 1511 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1512 else 1513 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1514 errno = 0; 1515 dprintf("%s\n", buf); 1516 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1517 recursed--; 1518 } 1519 1520 static void 1521 die(int signo) 1522 { 1523 struct filed *f; 1524 struct socklist *sl; 1525 int was_initialized; 1526 char buf[100]; 1527 1528 was_initialized = Initialized; 1529 Initialized = 0; /* Don't log SIGCHLDs. */ 1530 STAILQ_FOREACH(f, &fhead, next) { 1531 /* flush any pending output */ 1532 if (f->f_prevcount) 1533 fprintlog(f, 0, (char *)NULL); 1534 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) { 1535 close_filed(f); 1536 f->fu_pipe_pid = 0; 1537 } 1538 } 1539 Initialized = was_initialized; 1540 if (signo) { 1541 dprintf("syslogd: exiting on signal %d\n", signo); 1542 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1543 errno = 0; 1544 logerror(buf); 1545 } 1546 STAILQ_FOREACH(sl, &shead, next) { 1547 if (sl->sl_ss.ss_family == AF_LOCAL) 1548 unlink(sl->sl_peer->pe_name); 1549 } 1550 pidfile_remove(pfh); 1551 1552 exit(1); 1553 } 1554 1555 static int 1556 configfiles(const struct dirent *dp) 1557 { 1558 const char *p; 1559 size_t ext_len; 1560 1561 if (dp->d_name[0] == '.') 1562 return (0); 1563 1564 ext_len = sizeof(include_ext) -1; 1565 1566 if (dp->d_namlen <= ext_len) 1567 return (0); 1568 1569 p = &dp->d_name[dp->d_namlen - ext_len]; 1570 if (strcmp(p, include_ext) != 0) 1571 return (0); 1572 1573 return (1); 1574 } 1575 1576 static void 1577 readconfigfile(FILE *cf, int allow_includes) 1578 { 1579 FILE *cf2; 1580 struct filed *f; 1581 struct dirent **ent; 1582 char cline[LINE_MAX]; 1583 char host[MAXHOSTNAMELEN]; 1584 char prog[LINE_MAX]; 1585 char file[MAXPATHLEN]; 1586 char *p, *tmp; 1587 int i, nents; 1588 size_t include_len; 1589 1590 /* 1591 * Foreach line in the conf table, open that file. 1592 */ 1593 f = NULL; 1594 include_len = sizeof(include_str) -1; 1595 (void)strlcpy(host, "*", sizeof(host)); 1596 (void)strlcpy(prog, "*", sizeof(prog)); 1597 while (fgets(cline, sizeof(cline), cf) != NULL) { 1598 /* 1599 * check for end-of-section, comments, strip off trailing 1600 * spaces and newline character. #!prog is treated specially: 1601 * following lines apply only to that program. 1602 */ 1603 for (p = cline; isspace(*p); ++p) 1604 continue; 1605 if (*p == 0) 1606 continue; 1607 if (allow_includes && 1608 strncmp(p, include_str, include_len) == 0 && 1609 isspace(p[include_len])) { 1610 p += include_len; 1611 while (isspace(*p)) 1612 p++; 1613 tmp = p; 1614 while (*tmp != '\0' && !isspace(*tmp)) 1615 tmp++; 1616 *tmp = '\0'; 1617 dprintf("Trying to include files in '%s'\n", p); 1618 nents = scandir(p, &ent, configfiles, alphasort); 1619 if (nents == -1) { 1620 dprintf("Unable to open '%s': %s\n", p, 1621 strerror(errno)); 1622 continue; 1623 } 1624 for (i = 0; i < nents; i++) { 1625 if (snprintf(file, sizeof(file), "%s/%s", p, 1626 ent[i]->d_name) >= (int)sizeof(file)) { 1627 dprintf("ignoring path too long: " 1628 "'%s/%s'\n", p, ent[i]->d_name); 1629 free(ent[i]); 1630 continue; 1631 } 1632 free(ent[i]); 1633 cf2 = fopen(file, "r"); 1634 if (cf2 == NULL) 1635 continue; 1636 dprintf("reading %s\n", file); 1637 readconfigfile(cf2, 0); 1638 fclose(cf2); 1639 } 1640 free(ent); 1641 continue; 1642 } 1643 if (*p == '#') { 1644 p++; 1645 if (*p != '!' && *p != '+' && *p != '-') 1646 continue; 1647 } 1648 if (*p == '+' || *p == '-') { 1649 host[0] = *p++; 1650 while (isspace(*p)) 1651 p++; 1652 if ((!*p) || (*p == '*')) { 1653 (void)strlcpy(host, "*", sizeof(host)); 1654 continue; 1655 } 1656 if (*p == '@') 1657 p = LocalHostName; 1658 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1659 if (!isalnum(*p) && *p != '.' && *p != '-' 1660 && *p != ',' && *p != ':' && *p != '%') 1661 break; 1662 host[i] = *p++; 1663 } 1664 host[i] = '\0'; 1665 continue; 1666 } 1667 if (*p == '!') { 1668 p++; 1669 while (isspace(*p)) p++; 1670 if ((!*p) || (*p == '*')) { 1671 (void)strlcpy(prog, "*", sizeof(prog)); 1672 continue; 1673 } 1674 for (i = 0; i < LINE_MAX - 1; i++) { 1675 if (!isprint(p[i]) || isspace(p[i])) 1676 break; 1677 prog[i] = p[i]; 1678 } 1679 prog[i] = 0; 1680 continue; 1681 } 1682 for (p = cline + 1; *p != '\0'; p++) { 1683 if (*p != '#') 1684 continue; 1685 if (*(p - 1) == '\\') { 1686 strcpy(p - 1, p); 1687 p--; 1688 continue; 1689 } 1690 *p = '\0'; 1691 break; 1692 } 1693 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1694 cline[i] = '\0'; 1695 f = (struct filed *)calloc(1, sizeof(*f)); 1696 if (f == NULL) { 1697 logerror("calloc"); 1698 exit(1); 1699 } 1700 STAILQ_INSERT_TAIL(&fhead, f, next); 1701 cfline(cline, f, prog, host); 1702 } 1703 } 1704 1705 /* 1706 * INIT -- Initialize syslogd from configuration table 1707 */ 1708 static void 1709 init(int signo) 1710 { 1711 int i; 1712 FILE *cf; 1713 struct filed *f; 1714 char *p; 1715 char oldLocalHostName[MAXHOSTNAMELEN]; 1716 char hostMsg[2*MAXHOSTNAMELEN+40]; 1717 char bootfileMsg[LINE_MAX]; 1718 1719 dprintf("init\n"); 1720 1721 /* 1722 * Load hostname (may have changed). 1723 */ 1724 if (signo != 0) 1725 (void)strlcpy(oldLocalHostName, LocalHostName, 1726 sizeof(oldLocalHostName)); 1727 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1728 err(EX_OSERR, "gethostname() failed"); 1729 if ((p = strchr(LocalHostName, '.')) != NULL) { 1730 *p++ = '\0'; 1731 LocalDomain = p; 1732 } else { 1733 LocalDomain = ""; 1734 } 1735 1736 /* 1737 * Load / reload timezone data (in case it changed). 1738 * 1739 * Just calling tzset() again does not work, the timezone code 1740 * caches the result. However, by setting the TZ variable, one 1741 * can defeat the caching and have the timezone code really 1742 * reload the timezone data. Respect any initial setting of 1743 * TZ, in case the system is configured specially. 1744 */ 1745 dprintf("loading timezone data via tzset()\n"); 1746 if (getenv("TZ")) { 1747 tzset(); 1748 } else { 1749 setenv("TZ", ":/etc/localtime", 1); 1750 tzset(); 1751 unsetenv("TZ"); 1752 } 1753 1754 /* 1755 * Close all open log files. 1756 */ 1757 Initialized = 0; 1758 STAILQ_FOREACH(f, &fhead, next) { 1759 /* flush any pending output */ 1760 if (f->f_prevcount) 1761 fprintlog(f, 0, (char *)NULL); 1762 1763 switch (f->f_type) { 1764 case F_FILE: 1765 case F_FORW: 1766 case F_CONSOLE: 1767 case F_TTY: 1768 close_filed(f); 1769 break; 1770 case F_PIPE: 1771 if (f->fu_pipe_pid > 0) { 1772 close_filed(f); 1773 deadq_enter(f->fu_pipe_pid, 1774 f->fu_pipe_pname); 1775 } 1776 f->fu_pipe_pid = 0; 1777 break; 1778 } 1779 } 1780 while(!STAILQ_EMPTY(&fhead)) { 1781 f = STAILQ_FIRST(&fhead); 1782 STAILQ_REMOVE_HEAD(&fhead, next); 1783 free(f->f_program); 1784 free(f->f_host); 1785 free(f); 1786 } 1787 1788 /* open the configuration file */ 1789 if ((cf = fopen(ConfFile, "r")) == NULL) { 1790 dprintf("cannot open %s\n", ConfFile); 1791 f = calloc(1, sizeof(*f)); 1792 if (f == NULL) { 1793 logerror("calloc"); 1794 exit(1); 1795 } 1796 cfline("*.ERR\t/dev/console", f, "*", "*"); 1797 STAILQ_INSERT_TAIL(&fhead, f, next); 1798 1799 f = calloc(1, sizeof(*f)); 1800 if (f == NULL) { 1801 logerror("calloc"); 1802 exit(1); 1803 } 1804 cfline("*.PANIC\t*", f, "*", "*"); 1805 STAILQ_INSERT_TAIL(&fhead, f, next); 1806 1807 Initialized = 1; 1808 return; 1809 } 1810 1811 readconfigfile(cf, 1); 1812 1813 /* close the configuration file */ 1814 (void)fclose(cf); 1815 1816 Initialized = 1; 1817 1818 if (Debug) { 1819 int port; 1820 STAILQ_FOREACH(f, &fhead, next) { 1821 for (i = 0; i <= LOG_NFACILITIES; i++) 1822 if (f->f_pmask[i] == INTERNAL_NOPRI) 1823 printf("X "); 1824 else 1825 printf("%d ", f->f_pmask[i]); 1826 printf("%s: ", TypeNames[f->f_type]); 1827 switch (f->f_type) { 1828 case F_FILE: 1829 printf("%s", f->fu_fname); 1830 break; 1831 1832 case F_CONSOLE: 1833 case F_TTY: 1834 printf("%s%s", _PATH_DEV, f->fu_fname); 1835 break; 1836 1837 case F_FORW: 1838 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1839 if (port != 514) { 1840 printf("%s:%d", 1841 f->fu_forw_hname, port); 1842 } else { 1843 printf("%s", f->fu_forw_hname); 1844 } 1845 break; 1846 1847 case F_PIPE: 1848 printf("%s", f->fu_pipe_pname); 1849 break; 1850 1851 case F_USERS: 1852 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1853 printf("%s, ", f->fu_uname[i]); 1854 break; 1855 } 1856 if (f->f_program) 1857 printf(" (%s)", f->f_program); 1858 printf("\n"); 1859 } 1860 } 1861 1862 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1863 dprintf("syslogd: restarted\n"); 1864 /* 1865 * Log a change in hostname, but only on a restart. 1866 */ 1867 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1868 (void)snprintf(hostMsg, sizeof(hostMsg), 1869 "syslogd: hostname changed, \"%s\" to \"%s\"", 1870 oldLocalHostName, LocalHostName); 1871 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1872 dprintf("%s\n", hostMsg); 1873 } 1874 /* 1875 * Log the kernel boot file if we aren't going to use it as 1876 * the prefix, and if this is *not* a restart. 1877 */ 1878 if (signo == 0 && !use_bootfile) { 1879 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1880 "syslogd: kernel boot file is %s", bootfile); 1881 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1882 dprintf("%s\n", bootfileMsg); 1883 } 1884 } 1885 1886 /* 1887 * Crack a configuration file line 1888 */ 1889 static void 1890 cfline(const char *line, struct filed *f, const char *prog, const char *host) 1891 { 1892 struct addrinfo hints, *res; 1893 int error, i, pri, syncfile; 1894 const char *p, *q; 1895 char *bp; 1896 char buf[MAXLINE], ebuf[100]; 1897 1898 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1899 1900 errno = 0; /* keep strerror() stuff out of logerror messages */ 1901 1902 /* clear out file entry */ 1903 memset(f, 0, sizeof(*f)); 1904 for (i = 0; i <= LOG_NFACILITIES; i++) 1905 f->f_pmask[i] = INTERNAL_NOPRI; 1906 1907 /* save hostname if any */ 1908 if (host && *host == '*') 1909 host = NULL; 1910 if (host) { 1911 int hl; 1912 1913 f->f_host = strdup(host); 1914 if (f->f_host == NULL) { 1915 logerror("strdup"); 1916 exit(1); 1917 } 1918 hl = strlen(f->f_host); 1919 if (hl > 0 && f->f_host[hl-1] == '.') 1920 f->f_host[--hl] = '\0'; 1921 trimdomain(f->f_host, hl); 1922 } 1923 1924 /* save program name if any */ 1925 if (prog && *prog == '*') 1926 prog = NULL; 1927 if (prog) { 1928 f->f_program = strdup(prog); 1929 if (f->f_program == NULL) { 1930 logerror("strdup"); 1931 exit(1); 1932 } 1933 } 1934 1935 /* scan through the list of selectors */ 1936 for (p = line; *p && *p != '\t' && *p != ' ';) { 1937 int pri_done; 1938 int pri_cmp; 1939 int pri_invert; 1940 1941 /* find the end of this facility name list */ 1942 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 1943 continue; 1944 1945 /* get the priority comparison */ 1946 pri_cmp = 0; 1947 pri_done = 0; 1948 pri_invert = 0; 1949 if (*q == '!') { 1950 pri_invert = 1; 1951 q++; 1952 } 1953 while (!pri_done) { 1954 switch (*q) { 1955 case '<': 1956 pri_cmp |= PRI_LT; 1957 q++; 1958 break; 1959 case '=': 1960 pri_cmp |= PRI_EQ; 1961 q++; 1962 break; 1963 case '>': 1964 pri_cmp |= PRI_GT; 1965 q++; 1966 break; 1967 default: 1968 pri_done++; 1969 break; 1970 } 1971 } 1972 1973 /* collect priority name */ 1974 for (bp = buf; *q && !strchr("\t,; ", *q); ) 1975 *bp++ = *q++; 1976 *bp = '\0'; 1977 1978 /* skip cruft */ 1979 while (strchr(",;", *q)) 1980 q++; 1981 1982 /* decode priority name */ 1983 if (*buf == '*') { 1984 pri = LOG_PRIMASK; 1985 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 1986 } else { 1987 /* Ignore trailing spaces. */ 1988 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 1989 buf[i] = '\0'; 1990 1991 pri = decode(buf, prioritynames); 1992 if (pri < 0) { 1993 errno = 0; 1994 (void)snprintf(ebuf, sizeof ebuf, 1995 "unknown priority name \"%s\"", buf); 1996 logerror(ebuf); 1997 return; 1998 } 1999 } 2000 if (!pri_cmp) 2001 pri_cmp = (UniquePriority) 2002 ? (PRI_EQ) 2003 : (PRI_EQ | PRI_GT) 2004 ; 2005 if (pri_invert) 2006 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2007 2008 /* scan facilities */ 2009 while (*p && !strchr("\t.; ", *p)) { 2010 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2011 *bp++ = *p++; 2012 *bp = '\0'; 2013 2014 if (*buf == '*') { 2015 for (i = 0; i < LOG_NFACILITIES; i++) { 2016 f->f_pmask[i] = pri; 2017 f->f_pcmp[i] = pri_cmp; 2018 } 2019 } else { 2020 i = decode(buf, facilitynames); 2021 if (i < 0) { 2022 errno = 0; 2023 (void)snprintf(ebuf, sizeof ebuf, 2024 "unknown facility name \"%s\"", 2025 buf); 2026 logerror(ebuf); 2027 return; 2028 } 2029 f->f_pmask[i >> 3] = pri; 2030 f->f_pcmp[i >> 3] = pri_cmp; 2031 } 2032 while (*p == ',' || *p == ' ') 2033 p++; 2034 } 2035 2036 p = q; 2037 } 2038 2039 /* skip to action part */ 2040 while (*p == '\t' || *p == ' ') 2041 p++; 2042 2043 if (*p == '-') { 2044 syncfile = 0; 2045 p++; 2046 } else 2047 syncfile = 1; 2048 2049 switch (*p) { 2050 case '@': 2051 { 2052 char *tp; 2053 char endkey = ':'; 2054 /* 2055 * scan forward to see if there is a port defined. 2056 * so we can't use strlcpy.. 2057 */ 2058 i = sizeof(f->fu_forw_hname); 2059 tp = f->fu_forw_hname; 2060 p++; 2061 2062 /* 2063 * an ipv6 address should start with a '[' in that case 2064 * we should scan for a ']' 2065 */ 2066 if (*p == '[') { 2067 p++; 2068 endkey = ']'; 2069 } 2070 while (*p && (*p != endkey) && (i-- > 0)) { 2071 *tp++ = *p++; 2072 } 2073 if (endkey == ']' && *p == endkey) 2074 p++; 2075 *tp = '\0'; 2076 } 2077 /* See if we copied a domain and have a port */ 2078 if (*p == ':') 2079 p++; 2080 else 2081 p = NULL; 2082 2083 memset(&hints, 0, sizeof(hints)); 2084 hints.ai_family = family; 2085 hints.ai_socktype = SOCK_DGRAM; 2086 error = getaddrinfo(f->fu_forw_hname, 2087 p ? p : "syslog", &hints, &res); 2088 if (error) { 2089 logerror(gai_strerror(error)); 2090 break; 2091 } 2092 f->fu_forw_addr = res; 2093 f->f_type = F_FORW; 2094 break; 2095 2096 case '/': 2097 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2098 f->f_type = F_UNUSED; 2099 logerror(p); 2100 break; 2101 } 2102 if (syncfile) 2103 f->f_flags |= FFLAG_SYNC; 2104 if (isatty(f->f_file)) { 2105 if (strcmp(p, ctty) == 0) 2106 f->f_type = F_CONSOLE; 2107 else 2108 f->f_type = F_TTY; 2109 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2110 sizeof(f->fu_fname)); 2111 } else { 2112 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2113 f->f_type = F_FILE; 2114 } 2115 break; 2116 2117 case '|': 2118 f->fu_pipe_pid = 0; 2119 (void)strlcpy(f->fu_pipe_pname, p + 1, 2120 sizeof(f->fu_pipe_pname)); 2121 f->f_type = F_PIPE; 2122 break; 2123 2124 case '*': 2125 f->f_type = F_WALL; 2126 break; 2127 2128 default: 2129 for (i = 0; i < MAXUNAMES && *p; i++) { 2130 for (q = p; *q && *q != ','; ) 2131 q++; 2132 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2133 if ((q - p) >= MAXLOGNAME) 2134 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2135 else 2136 f->fu_uname[i][q - p] = '\0'; 2137 while (*q == ',' || *q == ' ') 2138 q++; 2139 p = q; 2140 } 2141 f->f_type = F_USERS; 2142 break; 2143 } 2144 } 2145 2146 2147 /* 2148 * Decode a symbolic name to a numeric value 2149 */ 2150 static int 2151 decode(const char *name, const CODE *codetab) 2152 { 2153 const CODE *c; 2154 char *p, buf[40]; 2155 2156 if (isdigit(*name)) 2157 return (atoi(name)); 2158 2159 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2160 if (isupper(*name)) 2161 *p = tolower(*name); 2162 else 2163 *p = *name; 2164 } 2165 *p = '\0'; 2166 for (c = codetab; c->c_name; c++) 2167 if (!strcmp(buf, c->c_name)) 2168 return (c->c_val); 2169 2170 return (-1); 2171 } 2172 2173 static void 2174 markit(void) 2175 { 2176 struct filed *f; 2177 dq_t q, next; 2178 2179 now = time((time_t *)NULL); 2180 MarkSeq += TIMERINTVL; 2181 if (MarkSeq >= MarkInterval) { 2182 logmsg(LOG_INFO, "-- MARK --", 2183 LocalHostName, ADDDATE|MARK); 2184 MarkSeq = 0; 2185 } 2186 2187 STAILQ_FOREACH(f, &fhead, next) { 2188 if (f->f_prevcount && now >= REPEATTIME(f)) { 2189 dprintf("flush %s: repeated %d times, %d sec.\n", 2190 TypeNames[f->f_type], f->f_prevcount, 2191 repeatinterval[f->f_repeatcount]); 2192 fprintlog(f, 0, (char *)NULL); 2193 BACKOFF(f); 2194 } 2195 } 2196 2197 /* Walk the dead queue, and see if we should signal somebody. */ 2198 for (q = TAILQ_FIRST(&deadq_head); q != NULL; q = next) { 2199 next = TAILQ_NEXT(q, dq_entries); 2200 2201 switch (q->dq_timeout) { 2202 case 0: 2203 /* Already signalled once, try harder now. */ 2204 if (kill(q->dq_pid, SIGKILL) != 0) 2205 (void)deadq_remove(q->dq_pid); 2206 break; 2207 2208 case 1: 2209 /* 2210 * Timed out on dead queue, send terminate 2211 * signal. Note that we leave the removal 2212 * from the dead queue to reapchild(), which 2213 * will also log the event (unless the process 2214 * didn't even really exist, in case we simply 2215 * drop it from the dead queue). 2216 */ 2217 if (kill(q->dq_pid, SIGTERM) != 0) 2218 (void)deadq_remove(q->dq_pid); 2219 /* FALLTHROUGH */ 2220 2221 default: 2222 q->dq_timeout--; 2223 } 2224 } 2225 MarkSet = 0; 2226 (void)alarm(TIMERINTVL); 2227 } 2228 2229 /* 2230 * fork off and become a daemon, but wait for the child to come online 2231 * before returing to the parent, or we get disk thrashing at boot etc. 2232 * Set a timer so we don't hang forever if it wedges. 2233 */ 2234 static int 2235 waitdaemon(int nochdir, int noclose, int maxwait) 2236 { 2237 int fd; 2238 int status; 2239 pid_t pid, childpid; 2240 2241 switch (childpid = fork()) { 2242 case -1: 2243 return (-1); 2244 case 0: 2245 break; 2246 default: 2247 signal(SIGALRM, timedout); 2248 alarm(maxwait); 2249 while ((pid = wait3(&status, 0, NULL)) != -1) { 2250 if (WIFEXITED(status)) 2251 errx(1, "child pid %d exited with return code %d", 2252 pid, WEXITSTATUS(status)); 2253 if (WIFSIGNALED(status)) 2254 errx(1, "child pid %d exited on signal %d%s", 2255 pid, WTERMSIG(status), 2256 WCOREDUMP(status) ? " (core dumped)" : 2257 ""); 2258 if (pid == childpid) /* it's gone... */ 2259 break; 2260 } 2261 exit(0); 2262 } 2263 2264 if (setsid() == -1) 2265 return (-1); 2266 2267 if (!nochdir) 2268 (void)chdir("/"); 2269 2270 if (!noclose && (fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2271 (void)dup2(fd, STDIN_FILENO); 2272 (void)dup2(fd, STDOUT_FILENO); 2273 (void)dup2(fd, STDERR_FILENO); 2274 if (fd > 2) 2275 (void)close (fd); 2276 } 2277 return (getppid()); 2278 } 2279 2280 /* 2281 * We get a SIGALRM from the child when it's running and finished doing it's 2282 * fsync()'s or O_SYNC writes for all the boot messages. 2283 * 2284 * We also get a signal from the kernel if the timer expires, so check to 2285 * see what happened. 2286 */ 2287 static void 2288 timedout(int sig __unused) 2289 { 2290 int left; 2291 left = alarm(0); 2292 signal(SIGALRM, SIG_DFL); 2293 if (left == 0) 2294 errx(1, "timed out waiting for child"); 2295 else 2296 _exit(0); 2297 } 2298 2299 /* 2300 * Add `s' to the list of allowable peer addresses to accept messages 2301 * from. 2302 * 2303 * `s' is a string in the form: 2304 * 2305 * [*]domainname[:{servicename|portnumber|*}] 2306 * 2307 * or 2308 * 2309 * netaddr/maskbits[:{servicename|portnumber|*}] 2310 * 2311 * Returns -1 on error, 0 if the argument was valid. 2312 */ 2313 static int 2314 allowaddr(char *s) 2315 { 2316 char *cp1, *cp2; 2317 struct allowedpeer *ap; 2318 struct servent *se; 2319 int masklen = -1; 2320 struct addrinfo hints, *res; 2321 struct in_addr *addrp, *maskp; 2322 #ifdef INET6 2323 int i; 2324 u_int32_t *addr6p, *mask6p; 2325 #endif 2326 char ip[NI_MAXHOST]; 2327 2328 ap = calloc(1, sizeof(*ap)); 2329 if (ap == NULL) 2330 err(1, "malloc failed"); 2331 2332 #ifdef INET6 2333 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2334 #endif 2335 cp1 = s; 2336 if ((cp1 = strrchr(cp1, ':'))) { 2337 /* service/port provided */ 2338 *cp1++ = '\0'; 2339 if (strlen(cp1) == 1 && *cp1 == '*') 2340 /* any port allowed */ 2341 ap->port = 0; 2342 else if ((se = getservbyname(cp1, "udp"))) { 2343 ap->port = ntohs(se->s_port); 2344 } else { 2345 ap->port = strtol(cp1, &cp2, 0); 2346 if (*cp2 != '\0') 2347 return (-1); /* port not numeric */ 2348 } 2349 } else { 2350 if ((se = getservbyname("syslog", "udp"))) 2351 ap->port = ntohs(se->s_port); 2352 else 2353 /* sanity, should not happen */ 2354 ap->port = 514; 2355 } 2356 2357 if ((cp1 = strchr(s, '/')) != NULL && 2358 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2359 *cp1 = '\0'; 2360 if ((masklen = atoi(cp1 + 1)) < 0) 2361 return (-1); 2362 } 2363 #ifdef INET6 2364 if (*s == '[') { 2365 cp2 = s + strlen(s) - 1; 2366 if (*cp2 == ']') { 2367 ++s; 2368 *cp2 = '\0'; 2369 } else { 2370 cp2 = NULL; 2371 } 2372 } else { 2373 cp2 = NULL; 2374 } 2375 #endif 2376 memset(&hints, 0, sizeof(hints)); 2377 hints.ai_family = PF_UNSPEC; 2378 hints.ai_socktype = SOCK_DGRAM; 2379 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2380 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2381 ap->isnumeric = 1; 2382 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2383 memset(&ap->a_mask, 0, sizeof(ap->a_mask)); 2384 ap->a_mask.ss_family = res->ai_family; 2385 if (res->ai_family == AF_INET) { 2386 ap->a_mask.ss_len = sizeof(struct sockaddr_in); 2387 maskp = &((struct sockaddr_in *)&ap->a_mask)->sin_addr; 2388 addrp = &((struct sockaddr_in *)&ap->a_addr)->sin_addr; 2389 if (masklen < 0) { 2390 /* use default netmask */ 2391 if (IN_CLASSA(ntohl(addrp->s_addr))) 2392 maskp->s_addr = htonl(IN_CLASSA_NET); 2393 else if (IN_CLASSB(ntohl(addrp->s_addr))) 2394 maskp->s_addr = htonl(IN_CLASSB_NET); 2395 else 2396 maskp->s_addr = htonl(IN_CLASSC_NET); 2397 } else if (masklen <= 32) { 2398 /* convert masklen to netmask */ 2399 if (masklen == 0) 2400 maskp->s_addr = 0; 2401 else 2402 maskp->s_addr = htonl(~((1 << (32 - masklen)) - 1)); 2403 } else { 2404 freeaddrinfo(res); 2405 return (-1); 2406 } 2407 /* Lose any host bits in the network number. */ 2408 addrp->s_addr &= maskp->s_addr; 2409 } 2410 #ifdef INET6 2411 else if (res->ai_family == AF_INET6 && masklen <= 128) { 2412 ap->a_mask.ss_len = sizeof(struct sockaddr_in6); 2413 if (masklen < 0) 2414 masklen = 128; 2415 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap->a_mask)->sin6_addr; 2416 /* convert masklen to netmask */ 2417 while (masklen > 0) { 2418 if (masklen < 32) { 2419 *mask6p = htonl(~(0xffffffff >> masklen)); 2420 break; 2421 } 2422 *mask6p++ = 0xffffffff; 2423 masklen -= 32; 2424 } 2425 /* Lose any host bits in the network number. */ 2426 mask6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap->a_mask)->sin6_addr; 2427 addr6p = (u_int32_t *)&((struct sockaddr_in6 *)&ap->a_addr)->sin6_addr; 2428 for (i = 0; i < 4; i++) 2429 addr6p[i] &= mask6p[i]; 2430 } 2431 #endif 2432 else { 2433 freeaddrinfo(res); 2434 return (-1); 2435 } 2436 freeaddrinfo(res); 2437 } else { 2438 /* arg `s' is domain name */ 2439 ap->isnumeric = 0; 2440 ap->a_name = s; 2441 if (cp1) 2442 *cp1 = '/'; 2443 #ifdef INET6 2444 if (cp2) { 2445 *cp2 = ']'; 2446 --s; 2447 } 2448 #endif 2449 } 2450 STAILQ_INSERT_TAIL(&aphead, ap, next); 2451 2452 if (Debug) { 2453 printf("allowaddr: rule "); 2454 if (ap->isnumeric) { 2455 printf("numeric, "); 2456 getnameinfo((struct sockaddr *)&ap->a_addr, 2457 ((struct sockaddr *)&ap->a_addr)->sa_len, 2458 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2459 printf("addr = %s, ", ip); 2460 getnameinfo((struct sockaddr *)&ap->a_mask, 2461 ((struct sockaddr *)&ap->a_mask)->sa_len, 2462 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2463 printf("mask = %s; ", ip); 2464 } else { 2465 printf("domainname = %s; ", ap->a_name); 2466 } 2467 printf("port = %d\n", ap->port); 2468 } 2469 return (0); 2470 } 2471 2472 /* 2473 * Validate that the remote peer has permission to log to us. 2474 */ 2475 static int 2476 validate(struct sockaddr *sa, const char *hname) 2477 { 2478 int i; 2479 size_t l1, l2; 2480 char *cp, name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2481 struct allowedpeer *ap; 2482 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2483 #ifdef INET6 2484 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2485 #endif 2486 struct addrinfo hints, *res; 2487 u_short sport; 2488 int num = 0; 2489 2490 STAILQ_FOREACH(ap, &aphead, next) { 2491 num++; 2492 } 2493 dprintf("# of validation rule: %d\n", num); 2494 if (num == 0) 2495 /* traditional behaviour, allow everything */ 2496 return (1); 2497 2498 (void)strlcpy(name, hname, sizeof(name)); 2499 memset(&hints, 0, sizeof(hints)); 2500 hints.ai_family = PF_UNSPEC; 2501 hints.ai_socktype = SOCK_DGRAM; 2502 hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST; 2503 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2504 freeaddrinfo(res); 2505 else if (strchr(name, '.') == NULL) { 2506 strlcat(name, ".", sizeof name); 2507 strlcat(name, LocalDomain, sizeof name); 2508 } 2509 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2510 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2511 return (0); /* for safety, should not occur */ 2512 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2513 ip, port, name); 2514 sport = atoi(port); 2515 2516 /* now, walk down the list */ 2517 i = 0; 2518 STAILQ_FOREACH(ap, &aphead, next) { 2519 i++; 2520 if (ap->port != 0 && ap->port != sport) { 2521 dprintf("rejected in rule %d due to port mismatch.\n", 2522 i); 2523 continue; 2524 } 2525 2526 if (ap->isnumeric) { 2527 if (ap->a_addr.ss_family != sa->sa_family) { 2528 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2529 continue; 2530 } 2531 if (ap->a_addr.ss_family == AF_INET) { 2532 sin4 = satosin(sa); 2533 a4p = satosin(&ap->a_addr); 2534 m4p = satosin(&ap->a_mask); 2535 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2536 != a4p->sin_addr.s_addr) { 2537 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2538 continue; 2539 } 2540 } 2541 #ifdef INET6 2542 else if (ap->a_addr.ss_family == AF_INET6) { 2543 sin6 = satosin6(sa); 2544 a6p = satosin6(&ap->a_addr); 2545 m6p = satosin6(&ap->a_mask); 2546 if (a6p->sin6_scope_id != 0 && 2547 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2548 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2549 continue; 2550 } 2551 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2552 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2553 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2554 continue; 2555 } 2556 } 2557 #endif 2558 else 2559 continue; 2560 } else { 2561 cp = ap->a_name; 2562 l1 = strlen(name); 2563 if (*cp == '*') { 2564 /* allow wildmatch */ 2565 cp++; 2566 l2 = strlen(cp); 2567 if (l2 > l1 || memcmp(cp, &name[l1 - l2], l2) != 0) { 2568 dprintf("rejected in rule %d due to name mismatch.\n", i); 2569 continue; 2570 } 2571 } else { 2572 /* exact match */ 2573 l2 = strlen(cp); 2574 if (l2 != l1 || memcmp(cp, name, l1) != 0) { 2575 dprintf("rejected in rule %d due to name mismatch.\n", i); 2576 continue; 2577 } 2578 } 2579 } 2580 dprintf("accepted in rule %d.\n", i); 2581 return (1); /* hooray! */ 2582 } 2583 return (0); 2584 } 2585 2586 /* 2587 * Fairly similar to popen(3), but returns an open descriptor, as 2588 * opposed to a FILE *. 2589 */ 2590 static int 2591 p_open(const char *prog, pid_t *rpid) 2592 { 2593 int pfd[2], nulldesc; 2594 pid_t pid; 2595 sigset_t omask, mask; 2596 char *argv[4]; /* sh -c cmd NULL */ 2597 char errmsg[200]; 2598 2599 if (pipe(pfd) == -1) 2600 return (-1); 2601 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2602 /* we are royally screwed anyway */ 2603 return (-1); 2604 2605 sigemptyset(&mask); 2606 sigaddset(&mask, SIGALRM); 2607 sigaddset(&mask, SIGHUP); 2608 sigprocmask(SIG_BLOCK, &mask, &omask); 2609 switch ((pid = fork())) { 2610 case -1: 2611 sigprocmask(SIG_SETMASK, &omask, 0); 2612 close(nulldesc); 2613 return (-1); 2614 2615 case 0: 2616 argv[0] = strdup("sh"); 2617 argv[1] = strdup("-c"); 2618 argv[2] = strdup(prog); 2619 argv[3] = NULL; 2620 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2621 logerror("strdup"); 2622 exit(1); 2623 } 2624 2625 alarm(0); 2626 (void)setsid(); /* Avoid catching SIGHUPs. */ 2627 2628 /* 2629 * Throw away pending signals, and reset signal 2630 * behaviour to standard values. 2631 */ 2632 signal(SIGALRM, SIG_IGN); 2633 signal(SIGHUP, SIG_IGN); 2634 sigprocmask(SIG_SETMASK, &omask, 0); 2635 signal(SIGPIPE, SIG_DFL); 2636 signal(SIGQUIT, SIG_DFL); 2637 signal(SIGALRM, SIG_DFL); 2638 signal(SIGHUP, SIG_DFL); 2639 2640 dup2(pfd[0], STDIN_FILENO); 2641 dup2(nulldesc, STDOUT_FILENO); 2642 dup2(nulldesc, STDERR_FILENO); 2643 closefrom(3); 2644 2645 (void)execvp(_PATH_BSHELL, argv); 2646 _exit(255); 2647 } 2648 2649 sigprocmask(SIG_SETMASK, &omask, 0); 2650 close(nulldesc); 2651 close(pfd[0]); 2652 /* 2653 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2654 * supposed to get an EWOULDBLOCK on writev(2), which is 2655 * caught by the logic above anyway, which will in turn close 2656 * the pipe, and fork a new logging subprocess if necessary. 2657 * The stale subprocess will be killed some time later unless 2658 * it terminated itself due to closing its input pipe (so we 2659 * get rid of really dead puppies). 2660 */ 2661 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2662 /* This is bad. */ 2663 (void)snprintf(errmsg, sizeof errmsg, 2664 "Warning: cannot change pipe to PID %d to " 2665 "non-blocking behaviour.", 2666 (int)pid); 2667 logerror(errmsg); 2668 } 2669 *rpid = pid; 2670 return (pfd[1]); 2671 } 2672 2673 static void 2674 deadq_enter(pid_t pid, const char *name) 2675 { 2676 dq_t p; 2677 int status; 2678 2679 /* 2680 * Be paranoid, if we can't signal the process, don't enter it 2681 * into the dead queue (perhaps it's already dead). If possible, 2682 * we try to fetch and log the child's status. 2683 */ 2684 if (kill(pid, 0) != 0) { 2685 if (waitpid(pid, &status, WNOHANG) > 0) 2686 log_deadchild(pid, status, name); 2687 return; 2688 } 2689 2690 p = malloc(sizeof(struct deadq_entry)); 2691 if (p == NULL) { 2692 logerror("malloc"); 2693 exit(1); 2694 } 2695 2696 p->dq_pid = pid; 2697 p->dq_timeout = DQ_TIMO_INIT; 2698 TAILQ_INSERT_TAIL(&deadq_head, p, dq_entries); 2699 } 2700 2701 static int 2702 deadq_remove(pid_t pid) 2703 { 2704 dq_t q; 2705 2706 TAILQ_FOREACH(q, &deadq_head, dq_entries) { 2707 if (q->dq_pid == pid) 2708 break; 2709 } 2710 if (q != NULL) { 2711 TAILQ_REMOVE(&deadq_head, q, dq_entries); 2712 free(q); 2713 return (1); 2714 } 2715 2716 return (0); 2717 } 2718 2719 static void 2720 log_deadchild(pid_t pid, int status, const char *name) 2721 { 2722 int code; 2723 char buf[256]; 2724 const char *reason; 2725 2726 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2727 if (WIFSIGNALED(status)) { 2728 reason = "due to signal"; 2729 code = WTERMSIG(status); 2730 } else { 2731 reason = "with status"; 2732 code = WEXITSTATUS(status); 2733 if (code == 0) 2734 return; 2735 } 2736 (void)snprintf(buf, sizeof buf, 2737 "Logging subprocess %d (%s) exited %s %d.", 2738 pid, name, reason, code); 2739 logerror(buf); 2740 } 2741 2742 static int 2743 socksetup(struct peer *pe) 2744 { 2745 struct addrinfo hints, *res, *res0; 2746 struct socklist *sl; 2747 int error; 2748 char *cp; 2749 /* 2750 * We have to handle this case for backwards compatibility: 2751 * If there are two (or more) colons but no '[' and ']', 2752 * assume this is an inet6 address without a service. 2753 */ 2754 if (pe->pe_name != NULL) { 2755 #ifdef INET6 2756 if (pe->pe_name[0] == '[' && 2757 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2758 pe->pe_name = &pe->pe_name[1]; 2759 *cp = '\0'; 2760 if (cp[1] == ':' && cp[2] != '\0') 2761 pe->pe_serv = cp + 2; 2762 } else { 2763 #endif 2764 cp = strchr(pe->pe_name, ':'); 2765 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2766 *cp = '\0'; 2767 if (cp[1] != '\0') 2768 pe->pe_serv = cp + 1; 2769 if (cp == pe->pe_name) 2770 pe->pe_name = NULL; 2771 } 2772 #ifdef INET6 2773 } 2774 #endif 2775 } 2776 memset(&hints, 0, sizeof(hints)); 2777 hints.ai_family = AF_UNSPEC; 2778 hints.ai_socktype = SOCK_DGRAM; 2779 hints.ai_flags = AI_PASSIVE; 2780 2781 dprintf("Try %s\n", pe->pe_name); 2782 if (pe->pe_serv == NULL) 2783 pe->pe_serv = "syslog"; 2784 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2785 if (error) { 2786 logerror(gai_strerror(error)); 2787 errno = 0; 2788 die(0); 2789 } 2790 for (res = res0; res != NULL; res = res->ai_next) { 2791 int s; 2792 int on = 1; 2793 2794 if (res->ai_family == AF_LOCAL) 2795 unlink(pe->pe_name); 2796 else if (SecureMode > 1) { 2797 /* Only AF_LOCAL in secure mode. */ 2798 continue; 2799 } 2800 if (family != AF_UNSPEC && res->ai_family != family) 2801 continue; 2802 2803 s = socket(res->ai_family, res->ai_socktype, 2804 res->ai_protocol); 2805 if (s < 0) { 2806 logerror("socket"); 2807 error++; 2808 continue; 2809 } 2810 #ifdef INET6 2811 if (res->ai_family == AF_INET6) { 2812 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2813 (char *)&on, sizeof(on)) < 0) { 2814 logerror("setsockopt(IPV6_V6ONLY)"); 2815 close(s); 2816 error++; 2817 continue; 2818 } 2819 } 2820 #endif 2821 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2822 (char *)&on, sizeof(on)) < 0) { 2823 logerror("setsockopt(SO_REUSEADDR)"); 2824 close(s); 2825 error++; 2826 continue; 2827 } 2828 /* 2829 * RFC 3164 recommends that client side message 2830 * should come from the privileged syslogd port. 2831 * 2832 * If the system administrator choose not to obey 2833 * this, we can skip the bind() step so that the 2834 * system will choose a port for us. 2835 */ 2836 if (NoBind == 0) { 2837 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 2838 logerror("bind"); 2839 close(s); 2840 error++; 2841 continue; 2842 } 2843 if (SecureMode == 0) 2844 increase_rcvbuf(s); 2845 } 2846 if (res->ai_family == AF_LOCAL && 2847 chmod(pe->pe_name, pe->pe_mode) < 0) { 2848 dprintf("chmod %s: %s\n", pe->pe_name, 2849 strerror(errno)); 2850 close(s); 2851 error++; 2852 continue; 2853 } 2854 dprintf("new socket fd is %d\n", s); 2855 listen(s, 5); 2856 dprintf("shutdown\n"); 2857 if (SecureMode) { 2858 /* Forbid communication in secure mode. */ 2859 if (shutdown(s, SHUT_RD) < 0 && 2860 errno != ENOTCONN) { 2861 logerror("shutdown"); 2862 if (!Debug) 2863 die(0); 2864 } 2865 dprintf("listening on inet socket\n"); 2866 } else 2867 dprintf("sending on inet socket\n"); 2868 sl = calloc(1, sizeof(*sl)); 2869 if (sl == NULL) 2870 err(1, "malloc failed"); 2871 sl->sl_socket = s; 2872 memcpy(&sl->sl_ss, res->ai_addr, res->ai_addrlen); 2873 sl->sl_peer = pe; 2874 STAILQ_INSERT_TAIL(&shead, sl, next); 2875 } 2876 freeaddrinfo(res0); 2877 2878 return(error); 2879 } 2880 2881 static void 2882 increase_rcvbuf(int fd) 2883 { 2884 socklen_t len, slen; 2885 2886 slen = sizeof(len); 2887 2888 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, &slen) == 0) { 2889 if (len < RCVBUF_MINSIZE) { 2890 len = RCVBUF_MINSIZE; 2891 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2892 } 2893 } 2894 } 2895