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 <fnmatch.h> 102 #include <libutil.h> 103 #include <limits.h> 104 #include <paths.h> 105 #include <signal.h> 106 #include <stdio.h> 107 #include <stdlib.h> 108 #include <string.h> 109 #include <sysexits.h> 110 #include <unistd.h> 111 #include <utmpx.h> 112 113 #include "pathnames.h" 114 #include "ttymsg.h" 115 116 #define SYSLOG_NAMES 117 #include <sys/syslog.h> 118 119 static const char *ConfFile = _PATH_LOGCONF; 120 static const char *PidFile = _PATH_LOGPID; 121 static const char ctty[] = _PATH_CONSOLE; 122 static const char include_str[] = "include"; 123 static const char include_ext[] = ".conf"; 124 125 #define dprintf if (Debug) printf 126 127 #define MAXUNAMES 20 /* maximum number of user names */ 128 129 #define sstosa(ss) ((struct sockaddr *)(ss)) 130 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 131 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 132 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 133 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 134 #define s6_addr32 __u6_addr.__u6_addr32 135 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 136 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 137 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 138 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 139 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 140 /* 141 * List of peers and sockets for binding. 142 */ 143 struct peer { 144 const char *pe_name; 145 const char *pe_serv; 146 mode_t pe_mode; 147 STAILQ_ENTRY(peer) next; 148 }; 149 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 150 151 struct socklist { 152 struct sockaddr_storage sl_ss; 153 int sl_socket; 154 struct peer *sl_peer; 155 int (*sl_recv)(struct socklist *); 156 STAILQ_ENTRY(socklist) next; 157 }; 158 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 159 160 /* 161 * Flags to logmsg(). 162 */ 163 164 #define IGN_CONS 0x001 /* don't print on console */ 165 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 166 #define ADDDATE 0x004 /* add a date to the message */ 167 #define MARK 0x008 /* this message is a mark */ 168 #define ISKERNEL 0x010 /* kernel generated message */ 169 170 /* 171 * This structure represents the files that will have log 172 * copies printed. 173 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 174 * or if f_type if F_PIPE and f_pid > 0. 175 */ 176 177 struct filed { 178 STAILQ_ENTRY(filed) next; /* next in linked list */ 179 short f_type; /* entry type, see below */ 180 short f_file; /* file descriptor */ 181 time_t f_time; /* time this was last written */ 182 char *f_host; /* host from which to recd. */ 183 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 184 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 185 #define PRI_LT 0x1 186 #define PRI_EQ 0x2 187 #define PRI_GT 0x4 188 char *f_program; /* program this applies to */ 189 union { 190 char f_uname[MAXUNAMES][MAXLOGNAME]; 191 struct { 192 char f_hname[MAXHOSTNAMELEN]; 193 struct addrinfo *f_addr; 194 195 } f_forw; /* forwarding address */ 196 char f_fname[MAXPATHLEN]; 197 struct { 198 char f_pname[MAXPATHLEN]; 199 pid_t f_pid; 200 } f_pipe; 201 } f_un; 202 #define fu_uname f_un.f_uname 203 #define fu_forw_hname f_un.f_forw.f_hname 204 #define fu_forw_addr f_un.f_forw.f_addr 205 #define fu_fname f_un.f_fname 206 #define fu_pipe_pname f_un.f_pipe.f_pname 207 #define fu_pipe_pid f_un.f_pipe.f_pid 208 char f_prevline[MAXSVLINE]; /* last message logged */ 209 char f_lasttime[16]; /* time of last occurrence */ 210 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 211 int f_prevpri; /* pri of f_prevline */ 212 int f_prevlen; /* length of f_prevline */ 213 int f_prevcount; /* repetition cnt of prevline */ 214 u_int f_repeatcount; /* number of "repeated" msgs */ 215 int f_flags; /* file-specific flags */ 216 #define FFLAG_SYNC 0x01 217 #define FFLAG_NEEDSYNC 0x02 218 }; 219 220 /* 221 * Queue of about-to-be dead processes we should watch out for. 222 */ 223 struct deadq_entry { 224 pid_t dq_pid; 225 int dq_timeout; 226 TAILQ_ENTRY(deadq_entry) dq_entries; 227 }; 228 static TAILQ_HEAD(, deadq_entry) deadq_head = 229 TAILQ_HEAD_INITIALIZER(deadq_head); 230 231 /* 232 * The timeout to apply to processes waiting on the dead queue. Unit 233 * of measure is `mark intervals', i.e. 20 minutes by default. 234 * Processes on the dead queue will be terminated after that time. 235 */ 236 237 #define DQ_TIMO_INIT 2 238 239 /* 240 * Struct to hold records of network addresses that are allowed to log 241 * to us. 242 */ 243 struct allowedpeer { 244 int isnumeric; 245 u_short port; 246 union { 247 struct { 248 struct sockaddr_storage addr; 249 struct sockaddr_storage mask; 250 } numeric; 251 char *name; 252 } u; 253 #define a_addr u.numeric.addr 254 #define a_mask u.numeric.mask 255 #define a_name u.name 256 STAILQ_ENTRY(allowedpeer) next; 257 }; 258 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 259 260 261 /* 262 * Intervals at which we flush out "message repeated" messages, 263 * in seconds after previous message is logged. After each flush, 264 * we move to the next interval until we reach the largest. 265 */ 266 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 267 #define MAXREPEAT (nitems(repeatinterval) - 1) 268 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 269 #define BACKOFF(f) do { \ 270 if (++(f)->f_repeatcount > MAXREPEAT) \ 271 (f)->f_repeatcount = MAXREPEAT; \ 272 } while (0) 273 274 /* values for f_type */ 275 #define F_UNUSED 0 /* unused entry */ 276 #define F_FILE 1 /* regular file */ 277 #define F_TTY 2 /* terminal */ 278 #define F_CONSOLE 3 /* console terminal */ 279 #define F_FORW 4 /* remote machine */ 280 #define F_USERS 5 /* list of users */ 281 #define F_WALL 6 /* everyone logged on */ 282 #define F_PIPE 7 /* pipe to program */ 283 284 static const char *TypeNames[8] = { 285 "UNUSED", "FILE", "TTY", "CONSOLE", 286 "FORW", "USERS", "WALL", "PIPE" 287 }; 288 289 static STAILQ_HEAD(, filed) fhead = 290 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 291 static struct filed consfile; /* Console */ 292 293 static int Debug; /* debug flag */ 294 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 295 static int resolve = 1; /* resolve hostname */ 296 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 297 static const char *LocalDomain; /* our local domain name */ 298 static int Initialized; /* set when we have initialized ourselves */ 299 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 300 static int MarkSeq; /* mark sequence number */ 301 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 302 static int SecureMode; /* when true, receive only unix domain socks */ 303 #ifdef INET6 304 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 305 #else 306 static int family = PF_INET; /* protocol family (IPv4 only) */ 307 #endif 308 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 309 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 310 static int use_bootfile; /* log entire bootfile for every kern msg */ 311 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 312 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 313 314 static char bootfile[MAXLINE+1]; /* booted kernel file */ 315 316 static int RemoteAddDate; /* Always set the date on remote messages */ 317 318 static int UniquePriority; /* Only log specified priority? */ 319 static int LogFacPri; /* Put facility and priority in log message: */ 320 /* 0=no, 1=numeric, 2=names */ 321 static int KeepKernFac; /* Keep remotely logged kernel facility */ 322 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 323 static struct pidfh *pfh; 324 325 static volatile sig_atomic_t MarkSet, WantDie; 326 327 static int allowaddr(char *); 328 static int addfile(struct filed *); 329 static int addpeer(struct peer *); 330 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 331 static struct filed *cfline(const char *, const char *, const char *); 332 static const char *cvthname(struct sockaddr *); 333 static void deadq_enter(pid_t, const char *); 334 static int deadq_remove(struct deadq_entry *); 335 static int deadq_removebypid(pid_t); 336 static int decode(const char *, const CODE *); 337 static void die(int) __dead2; 338 static void dodie(int); 339 static void dofsync(void); 340 static void domark(int); 341 static void fprintlog(struct filed *, int, const char *); 342 static void init(int); 343 static void logerror(const char *); 344 static void logmsg(int, const char *, const char *, int); 345 static void log_deadchild(pid_t, int, const char *); 346 static void markit(void); 347 static int socksetup(struct peer *); 348 static int socklist_recv_file(struct socklist *); 349 static int socklist_recv_sock(struct socklist *); 350 static int skip_message(const char *, const char *, int); 351 static void printline(const char *, char *, int); 352 static void printsys(char *); 353 static int p_open(const char *, pid_t *); 354 static void reapchild(int); 355 static const char *ttymsg_check(struct iovec *, int, char *, int); 356 static void usage(void); 357 static int validate(struct sockaddr *, const char *); 358 static void unmapped(struct sockaddr *); 359 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 360 static int waitdaemon(int); 361 static void timedout(int); 362 static void increase_rcvbuf(int); 363 364 static void 365 close_filed(struct filed *f) 366 { 367 368 if (f == NULL || f->f_file == -1) 369 return; 370 371 (void)close(f->f_file); 372 f->f_file = -1; 373 f->f_type = F_UNUSED; 374 } 375 376 static int 377 addfile(struct filed *f0) 378 { 379 struct filed *f; 380 381 f = calloc(1, sizeof(*f)); 382 if (f == NULL) 383 err(1, "malloc failed"); 384 *f = *f0; 385 STAILQ_INSERT_TAIL(&fhead, f, next); 386 387 return (0); 388 } 389 390 static int 391 addpeer(struct peer *pe0) 392 { 393 struct peer *pe; 394 395 pe = calloc(1, sizeof(*pe)); 396 if (pe == NULL) 397 err(1, "malloc failed"); 398 *pe = *pe0; 399 STAILQ_INSERT_TAIL(&pqueue, pe, next); 400 401 return (0); 402 } 403 404 static int 405 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 406 { 407 struct socklist *sl; 408 409 sl = calloc(1, sizeof(*sl)); 410 if (sl == NULL) 411 err(1, "malloc failed"); 412 *sl = *sl0; 413 if (sa != NULL && sa_len > 0) 414 memcpy(&sl->sl_ss, sa, sa_len); 415 STAILQ_INSERT_TAIL(&shead, sl, next); 416 417 return (0); 418 } 419 420 int 421 main(int argc, char *argv[]) 422 { 423 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 424 fd_set *fdsr = NULL; 425 struct timeval tv, *tvp; 426 struct peer *pe; 427 struct socklist *sl; 428 sigset_t mask; 429 pid_t ppid = 1, spid; 430 char *p; 431 432 if (madvise(NULL, 0, MADV_PROTECT) != 0) 433 dprintf("madvise() failed: %s\n", strerror(errno)); 434 435 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 436 != -1) 437 switch (ch) { 438 #ifdef INET 439 case '4': 440 family = PF_INET; 441 break; 442 #endif 443 #ifdef INET6 444 case '6': 445 family = PF_INET6; 446 break; 447 #endif 448 case '8': 449 mask_C1 = 0; 450 break; 451 case 'A': 452 send_to_all++; 453 break; 454 case 'a': /* allow specific network addresses only */ 455 if (allowaddr(optarg) == -1) 456 usage(); 457 break; 458 case 'b': 459 bflag = 1; 460 if ((p = strchr(optarg, ':')) == NULL) { 461 /* A hostname or filename only. */ 462 addpeer(&(struct peer){ 463 .pe_name = optarg, 464 .pe_serv = "syslog" 465 }); 466 } else { 467 /* The case of "name:service". */ 468 *p++ = '\0'; 469 addpeer(&(struct peer){ 470 .pe_serv = p, 471 .pe_name = (strlen(optarg) == 0) ? 472 NULL : optarg, 473 }); 474 } 475 break; 476 case 'c': 477 no_compress++; 478 break; 479 case 'C': 480 logflags |= O_CREAT; 481 break; 482 case 'd': /* debug */ 483 Debug++; 484 break; 485 case 'f': /* configuration file */ 486 ConfFile = optarg; 487 break; 488 case 'F': /* run in foreground instead of daemon */ 489 Foreground++; 490 break; 491 case 'k': /* keep remote kern fac */ 492 KeepKernFac = 1; 493 break; 494 case 'l': 495 case 'p': 496 case 'S': 497 { 498 long perml; 499 mode_t mode; 500 char *name, *ep; 501 502 if (ch == 'l') 503 mode = DEFFILEMODE; 504 else if (ch == 'p') { 505 mode = DEFFILEMODE; 506 pflag = 1; 507 } else if (ch == 'S') { 508 mode = S_IRUSR | S_IWUSR; 509 Sflag = 1; 510 } 511 if (optarg[0] == '/') 512 name = optarg; 513 else if ((name = strchr(optarg, ':')) != NULL) { 514 *name++ = '\0'; 515 if (name[0] != '/') 516 errx(1, "socket name must be absolute " 517 "path"); 518 if (isdigit(*optarg)) { 519 perml = strtol(optarg, &ep, 8); 520 if (*ep || perml < 0 || 521 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 522 errx(1, "invalid mode %s, exiting", 523 optarg); 524 mode = (mode_t )perml; 525 } else 526 errx(1, "invalid mode %s, exiting", 527 optarg); 528 } else 529 errx(1, "invalid filename %s, exiting", 530 optarg); 531 addpeer(&(struct peer){ 532 .pe_name = name, 533 .pe_mode = mode 534 }); 535 break; 536 } 537 case 'm': /* mark interval */ 538 MarkInterval = atoi(optarg) * 60; 539 break; 540 case 'N': 541 NoBind = 1; 542 SecureMode = 1; 543 break; 544 case 'n': 545 resolve = 0; 546 break; 547 case 'o': 548 use_bootfile = 1; 549 break; 550 case 'P': /* path for alt. PID */ 551 PidFile = optarg; 552 break; 553 case 's': /* no network mode */ 554 SecureMode++; 555 break; 556 case 'T': 557 RemoteAddDate = 1; 558 break; 559 case 'u': /* only log specified priority */ 560 UniquePriority++; 561 break; 562 case 'v': /* log facility and priority */ 563 LogFacPri++; 564 break; 565 default: 566 usage(); 567 } 568 if ((argc -= optind) != 0) 569 usage(); 570 571 /* Listen by default: /dev/klog. */ 572 s = open(_PATH_KLOG, O_RDONLY|O_NONBLOCK, 0); 573 if (s < 0) { 574 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 575 } else { 576 addsock(NULL, 0, &(struct socklist){ 577 .sl_socket = s, 578 .sl_recv = socklist_recv_file, 579 }); 580 } 581 /* Listen by default: *:514 if no -b flag. */ 582 if (bflag == 0) 583 addpeer(&(struct peer){ 584 .pe_serv = "syslog" 585 }); 586 /* Listen by default: /var/run/log if no -p flag. */ 587 if (pflag == 0) 588 addpeer(&(struct peer){ 589 .pe_name = _PATH_LOG, 590 .pe_mode = DEFFILEMODE, 591 }); 592 /* Listen by default: /var/run/logpriv if no -S flag. */ 593 if (Sflag == 0) 594 addpeer(&(struct peer){ 595 .pe_name = _PATH_LOG_PRIV, 596 .pe_mode = S_IRUSR | S_IWUSR, 597 }); 598 STAILQ_FOREACH(pe, &pqueue, next) 599 socksetup(pe); 600 601 pfh = pidfile_open(PidFile, 0600, &spid); 602 if (pfh == NULL) { 603 if (errno == EEXIST) 604 errx(1, "syslogd already running, pid: %d", spid); 605 warn("cannot open pid file"); 606 } 607 608 if ((!Foreground) && (!Debug)) { 609 ppid = waitdaemon(30); 610 if (ppid < 0) { 611 warn("could not become daemon"); 612 pidfile_remove(pfh); 613 exit(1); 614 } 615 } else if (Debug) 616 setlinebuf(stdout); 617 618 consfile.f_type = F_CONSOLE; 619 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 620 sizeof(consfile.fu_fname)); 621 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 622 (void)signal(SIGTERM, dodie); 623 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 624 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 625 /* 626 * We don't want the SIGCHLD and SIGHUP handlers to interfere 627 * with each other; they are likely candidates for being called 628 * simultaneously (SIGHUP closes pipe descriptor, process dies, 629 * SIGCHLD happens). 630 */ 631 sigemptyset(&mask); 632 sigaddset(&mask, SIGHUP); 633 (void)sigaction(SIGCHLD, &(struct sigaction){ 634 .sa_handler = reapchild, 635 .sa_mask = mask, 636 .sa_flags = SA_RESTART 637 }, NULL); 638 (void)signal(SIGALRM, domark); 639 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 640 (void)alarm(TIMERINTVL); 641 642 /* tuck my process id away */ 643 pidfile_write(pfh); 644 645 dprintf("off & running....\n"); 646 647 init(0); 648 /* prevent SIGHUP and SIGCHLD handlers from running in parallel */ 649 sigemptyset(&mask); 650 sigaddset(&mask, SIGCHLD); 651 (void)sigaction(SIGHUP, &(struct sigaction){ 652 .sa_handler = init, 653 .sa_mask = mask, 654 .sa_flags = SA_RESTART 655 }, NULL); 656 657 tvp = &tv; 658 tv.tv_sec = tv.tv_usec = 0; 659 660 STAILQ_FOREACH(sl, &shead, next) { 661 if (sl->sl_socket > fdsrmax) 662 fdsrmax = sl->sl_socket; 663 } 664 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 665 sizeof(fd_mask)); 666 if (fdsr == NULL) 667 errx(1, "calloc fd_set"); 668 669 for (;;) { 670 if (MarkSet) 671 markit(); 672 if (WantDie) 673 die(WantDie); 674 675 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 676 sizeof(fd_mask)); 677 678 STAILQ_FOREACH(sl, &shead, next) { 679 if (sl->sl_socket != -1) 680 FD_SET(sl->sl_socket, fdsr); 681 } 682 i = select(fdsrmax + 1, fdsr, NULL, NULL, 683 needdofsync ? &tv : tvp); 684 switch (i) { 685 case 0: 686 dofsync(); 687 needdofsync = 0; 688 if (tvp) { 689 tvp = NULL; 690 if (ppid != 1) 691 kill(ppid, SIGALRM); 692 } 693 continue; 694 case -1: 695 if (errno != EINTR) 696 logerror("select"); 697 continue; 698 } 699 STAILQ_FOREACH(sl, &shead, next) { 700 if (FD_ISSET(sl->sl_socket, fdsr)) 701 (*sl->sl_recv)(sl); 702 } 703 } 704 if (fdsr) 705 free(fdsr); 706 } 707 708 static int 709 socklist_recv_sock(struct socklist *sl) 710 { 711 struct sockaddr_storage ss; 712 struct sockaddr *sa = (struct sockaddr *)&ss; 713 socklen_t sslen; 714 const char *hname; 715 char line[MAXLINE + 1]; 716 int date, len; 717 718 sslen = sizeof(ss); 719 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 720 dprintf("received sa_len = %d\n", sslen); 721 if (len == 0) 722 return (-1); 723 if (len < 0) { 724 if (errno != EINTR) 725 logerror("recvfrom"); 726 return (-1); 727 } 728 /* Received valid data. */ 729 line[len] = '\0'; 730 if (sl->sl_ss.ss_family == AF_LOCAL) { 731 hname = LocalHostName; 732 date = 0; 733 } else { 734 hname = cvthname(sa); 735 unmapped(sa); 736 if (validate(sa, hname) == 0) 737 hname = NULL; 738 date = RemoteAddDate ? ADDDATE : 0; 739 } 740 if (hname != NULL) 741 printline(hname, line, date); 742 else 743 dprintf("Invalid msg from %s was ignored.", hname); 744 745 return (0); 746 } 747 748 static void 749 unmapped(struct sockaddr *sa) 750 { 751 #if defined(INET) && defined(INET6) 752 struct sockaddr_in6 *sin6; 753 struct sockaddr_in sin; 754 755 if (sa == NULL || 756 sa->sa_family != AF_INET6 || 757 sa->sa_len != sizeof(*sin6)) 758 return; 759 sin6 = satosin6(sa); 760 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 761 return; 762 sin = (struct sockaddr_in){ 763 .sin_family = AF_INET, 764 .sin_len = sizeof(sin), 765 .sin_port = sin6->sin6_port 766 }; 767 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 768 sizeof(sin.sin_addr)); 769 memcpy(sa, &sin, sizeof(sin)); 770 #else 771 if (sa == NULL) 772 return; 773 #endif 774 } 775 776 static void 777 usage(void) 778 { 779 780 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 781 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 782 " [-b bind_address] [-f config_file]", 783 " [-l [mode:]path] [-m mark_interval]", 784 " [-P pid_file] [-p log_socket]", 785 " [-S logpriv_socket]"); 786 exit(1); 787 } 788 789 /* 790 * Take a raw input line, decode the message, and print the message 791 * on the appropriate log files. 792 */ 793 static void 794 printline(const char *hname, char *msg, int flags) 795 { 796 char *p, *q; 797 long n; 798 int c, pri; 799 char line[MAXLINE + 1]; 800 801 /* test for special codes */ 802 p = msg; 803 pri = DEFUPRI; 804 if (*p == '<') { 805 errno = 0; 806 n = strtol(p + 1, &q, 10); 807 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 808 p = q + 1; 809 pri = n; 810 } 811 } 812 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 813 pri = DEFUPRI; 814 815 /* 816 * Don't allow users to log kernel messages. 817 * NOTE: since LOG_KERN == 0 this will also match 818 * messages with no facility specified. 819 */ 820 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 821 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 822 823 q = line; 824 825 while ((c = (unsigned char)*p++) != '\0' && 826 q < &line[sizeof(line) - 4]) { 827 if (mask_C1 && (c & 0x80) && c < 0xA0) { 828 c &= 0x7F; 829 *q++ = 'M'; 830 *q++ = '-'; 831 } 832 if (isascii(c) && iscntrl(c)) { 833 if (c == '\n') { 834 *q++ = ' '; 835 } else if (c == '\t') { 836 *q++ = '\t'; 837 } else { 838 *q++ = '^'; 839 *q++ = c ^ 0100; 840 } 841 } else { 842 *q++ = c; 843 } 844 } 845 *q = '\0'; 846 847 logmsg(pri, line, hname, flags); 848 } 849 850 /* 851 * Read /dev/klog while data are available, split into lines. 852 */ 853 static int 854 socklist_recv_file(struct socklist *sl) 855 { 856 char *p, *q, line[MAXLINE + 1]; 857 int len, i; 858 859 len = 0; 860 for (;;) { 861 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 862 if (i > 0) { 863 line[i + len] = '\0'; 864 } else { 865 if (i < 0 && errno != EINTR && errno != EAGAIN) { 866 logerror("klog"); 867 close(sl->sl_socket); 868 sl->sl_socket = -1; 869 } 870 break; 871 } 872 873 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 874 *q = '\0'; 875 printsys(p); 876 } 877 len = strlen(p); 878 if (len >= MAXLINE - 1) { 879 printsys(p); 880 len = 0; 881 } 882 if (len > 0) 883 memmove(line, p, len + 1); 884 } 885 if (len > 0) 886 printsys(line); 887 888 return (len); 889 } 890 891 /* 892 * Take a raw input line from /dev/klog, format similar to syslog(). 893 */ 894 static void 895 printsys(char *msg) 896 { 897 char *p, *q; 898 long n; 899 int flags, isprintf, pri; 900 901 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 902 p = msg; 903 pri = DEFSPRI; 904 isprintf = 1; 905 if (*p == '<') { 906 errno = 0; 907 n = strtol(p + 1, &q, 10); 908 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 909 p = q + 1; 910 pri = n; 911 isprintf = 0; 912 } 913 } 914 /* 915 * Kernel printf's and LOG_CONSOLE messages have been displayed 916 * on the console already. 917 */ 918 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 919 flags |= IGN_CONS; 920 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 921 pri = DEFSPRI; 922 logmsg(pri, p, LocalHostName, flags); 923 } 924 925 static time_t now; 926 927 /* 928 * Match a program or host name against a specification. 929 * Return a non-0 value if the message must be ignored 930 * based on the specification. 931 */ 932 static int 933 skip_message(const char *name, const char *spec, int checkcase) 934 { 935 const char *s; 936 char prev, next; 937 int exclude = 0; 938 /* Behaviour on explicit match */ 939 940 if (spec == NULL) 941 return 0; 942 switch (*spec) { 943 case '-': 944 exclude = 1; 945 /*FALLTHROUGH*/ 946 case '+': 947 spec++; 948 break; 949 default: 950 break; 951 } 952 if (checkcase) 953 s = strstr (spec, name); 954 else 955 s = strcasestr (spec, name); 956 957 if (s != NULL) { 958 prev = (s == spec ? ',' : *(s - 1)); 959 next = *(s + strlen (name)); 960 961 if (prev == ',' && (next == '\0' || next == ',')) 962 /* Explicit match: skip iff the spec is an 963 exclusive one. */ 964 return exclude; 965 } 966 967 /* No explicit match for this name: skip the message iff 968 the spec is an inclusive one. */ 969 return !exclude; 970 } 971 972 /* 973 * Log a message to the appropriate log files, users, etc. based on 974 * the priority. 975 */ 976 static void 977 logmsg(int pri, const char *msg, const char *from, int flags) 978 { 979 struct filed *f; 980 int i, fac, msglen, omask, prilev; 981 const char *timestamp; 982 char prog[NAME_MAX+1]; 983 char buf[MAXLINE+1]; 984 985 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 986 pri, flags, from, msg); 987 988 omask = sigblock(sigmask(SIGHUP)|sigmask(SIGALRM)); 989 990 /* 991 * Check to see if msg looks non-standard. 992 */ 993 msglen = strlen(msg); 994 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 995 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 996 flags |= ADDDATE; 997 998 (void)time(&now); 999 if (flags & ADDDATE) { 1000 timestamp = ctime(&now) + 4; 1001 } else { 1002 timestamp = msg; 1003 msg += 16; 1004 msglen -= 16; 1005 } 1006 1007 /* skip leading blanks */ 1008 while (isspace(*msg)) { 1009 msg++; 1010 msglen--; 1011 } 1012 1013 /* extract facility and priority level */ 1014 if (flags & MARK) 1015 fac = LOG_NFACILITIES; 1016 else 1017 fac = LOG_FAC(pri); 1018 1019 /* Check maximum facility number. */ 1020 if (fac > LOG_NFACILITIES) { 1021 (void)sigsetmask(omask); 1022 return; 1023 } 1024 1025 prilev = LOG_PRI(pri); 1026 1027 /* extract program name */ 1028 for (i = 0; i < NAME_MAX; i++) { 1029 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1030 msg[i] == '/' || isspace(msg[i])) 1031 break; 1032 prog[i] = msg[i]; 1033 } 1034 prog[i] = 0; 1035 1036 /* add kernel prefix for kernel messages */ 1037 if (flags & ISKERNEL) { 1038 snprintf(buf, sizeof(buf), "%s: %s", 1039 use_bootfile ? bootfile : "kernel", msg); 1040 msg = buf; 1041 msglen = strlen(buf); 1042 } 1043 1044 /* log the message to the particular outputs */ 1045 if (!Initialized) { 1046 f = &consfile; 1047 /* 1048 * Open in non-blocking mode to avoid hangs during open 1049 * and close(waiting for the port to drain). 1050 */ 1051 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1052 1053 if (f->f_file >= 0) { 1054 (void)strlcpy(f->f_lasttime, timestamp, 1055 sizeof(f->f_lasttime)); 1056 fprintlog(f, flags, msg); 1057 close(f->f_file); 1058 f->f_file = -1; 1059 } 1060 (void)sigsetmask(omask); 1061 return; 1062 } 1063 STAILQ_FOREACH(f, &fhead, next) { 1064 /* skip messages that are incorrect priority */ 1065 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1066 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1067 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1068 ) 1069 || f->f_pmask[fac] == INTERNAL_NOPRI) 1070 continue; 1071 1072 /* skip messages with the incorrect hostname */ 1073 if (skip_message(from, f->f_host, 0)) 1074 continue; 1075 1076 /* skip messages with the incorrect program name */ 1077 if (skip_message(prog, f->f_program, 1)) 1078 continue; 1079 1080 /* skip message to console if it has already been printed */ 1081 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1082 continue; 1083 1084 /* don't output marks to recently written files */ 1085 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1086 continue; 1087 1088 /* 1089 * suppress duplicate lines to this file 1090 */ 1091 if (no_compress - (f->f_type != F_PIPE) < 1 && 1092 (flags & MARK) == 0 && msglen == f->f_prevlen && 1093 !strcmp(msg, f->f_prevline) && 1094 !strcasecmp(from, f->f_prevhost)) { 1095 (void)strlcpy(f->f_lasttime, timestamp, 1096 sizeof(f->f_lasttime)); 1097 f->f_prevcount++; 1098 dprintf("msg repeated %d times, %ld sec of %d\n", 1099 f->f_prevcount, (long)(now - f->f_time), 1100 repeatinterval[f->f_repeatcount]); 1101 /* 1102 * If domark would have logged this by now, 1103 * flush it now (so we don't hold isolated messages), 1104 * but back off so we'll flush less often 1105 * in the future. 1106 */ 1107 if (now > REPEATTIME(f)) { 1108 fprintlog(f, flags, (char *)NULL); 1109 BACKOFF(f); 1110 } 1111 } else { 1112 /* new line, save it */ 1113 if (f->f_prevcount) 1114 fprintlog(f, 0, (char *)NULL); 1115 f->f_repeatcount = 0; 1116 f->f_prevpri = pri; 1117 (void)strlcpy(f->f_lasttime, timestamp, 1118 sizeof(f->f_lasttime)); 1119 (void)strlcpy(f->f_prevhost, from, 1120 sizeof(f->f_prevhost)); 1121 if (msglen < MAXSVLINE) { 1122 f->f_prevlen = msglen; 1123 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1124 fprintlog(f, flags, (char *)NULL); 1125 } else { 1126 f->f_prevline[0] = 0; 1127 f->f_prevlen = 0; 1128 fprintlog(f, flags, msg); 1129 } 1130 } 1131 } 1132 (void)sigsetmask(omask); 1133 } 1134 1135 static void 1136 dofsync(void) 1137 { 1138 struct filed *f; 1139 1140 STAILQ_FOREACH(f, &fhead, next) { 1141 if ((f->f_type == F_FILE) && 1142 (f->f_flags & FFLAG_NEEDSYNC)) { 1143 f->f_flags &= ~FFLAG_NEEDSYNC; 1144 (void)fsync(f->f_file); 1145 } 1146 } 1147 } 1148 1149 #define IOV_SIZE 7 1150 static void 1151 fprintlog(struct filed *f, int flags, const char *msg) 1152 { 1153 struct iovec iov[IOV_SIZE]; 1154 struct addrinfo *r; 1155 int l, lsent = 0; 1156 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1157 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1158 const char *msgret; 1159 1160 if (f->f_type == F_WALL) { 1161 /* The time displayed is not synchornized with the other log 1162 * destinations (like messages). Following fragment was using 1163 * ctime(&now), which was updating the time every 30 sec. 1164 * With f_lasttime, time is synchronized correctly. 1165 */ 1166 iov[0] = (struct iovec){ 1167 .iov_base = greetings, 1168 .iov_len = snprintf(greetings, sizeof(greetings), 1169 "\r\n\7Message from syslogd@%s " 1170 "at %.24s ...\r\n", 1171 f->f_prevhost, f->f_lasttime) 1172 }; 1173 if (iov[0].iov_len >= sizeof(greetings)) 1174 iov[0].iov_len = sizeof(greetings) - 1; 1175 iov[1] = (struct iovec){ 1176 .iov_base = nul, 1177 .iov_len = 0 1178 }; 1179 } else { 1180 iov[0] = (struct iovec){ 1181 .iov_base = f->f_lasttime, 1182 .iov_len = strlen(f->f_lasttime) 1183 }; 1184 iov[1] = (struct iovec){ 1185 .iov_base = space, 1186 .iov_len = 1 1187 }; 1188 } 1189 1190 if (LogFacPri) { 1191 static char fp_buf[30]; /* Hollow laugh */ 1192 int fac = f->f_prevpri & LOG_FACMASK; 1193 int pri = LOG_PRI(f->f_prevpri); 1194 const char *f_s = NULL; 1195 char f_n[5]; /* Hollow laugh */ 1196 const char *p_s = NULL; 1197 char p_n[5]; /* Hollow laugh */ 1198 1199 if (LogFacPri > 1) { 1200 const CODE *c; 1201 1202 for (c = facilitynames; c->c_name; c++) { 1203 if (c->c_val == fac) { 1204 f_s = c->c_name; 1205 break; 1206 } 1207 } 1208 for (c = prioritynames; c->c_name; c++) { 1209 if (c->c_val == pri) { 1210 p_s = c->c_name; 1211 break; 1212 } 1213 } 1214 } 1215 if (!f_s) { 1216 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1217 f_s = f_n; 1218 } 1219 if (!p_s) { 1220 snprintf(p_n, sizeof p_n, "%d", pri); 1221 p_s = p_n; 1222 } 1223 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1224 iov[2] = (struct iovec){ 1225 .iov_base = fp_buf, 1226 .iov_len = strlen(fp_buf) 1227 }; 1228 } else { 1229 iov[2] = (struct iovec){ 1230 .iov_base = nul, 1231 .iov_len = 0 1232 }; 1233 } 1234 iov[3] = (struct iovec){ 1235 .iov_base = f->f_prevhost, 1236 .iov_len = strlen(f->f_prevhost) 1237 }; 1238 iov[4] = (struct iovec){ 1239 .iov_base = space, 1240 .iov_len = 1 1241 }; 1242 if (msg) { 1243 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1244 if (wmsg == NULL) { 1245 logerror("strdup"); 1246 exit(1); 1247 } 1248 iov[5] = (struct iovec){ 1249 .iov_base = wmsg, 1250 .iov_len = strlen(msg) 1251 }; 1252 } else if (f->f_prevcount > 1) { 1253 iov[5] = (struct iovec){ 1254 .iov_base = repbuf, 1255 .iov_len = snprintf(repbuf, sizeof(repbuf), 1256 "last message repeated %d times", f->f_prevcount) 1257 }; 1258 } else { 1259 iov[5] = (struct iovec){ 1260 .iov_base = f->f_prevline, 1261 .iov_len = f->f_prevlen 1262 }; 1263 } 1264 dprintf("Logging to %s", TypeNames[f->f_type]); 1265 f->f_time = now; 1266 1267 switch (f->f_type) { 1268 case F_UNUSED: 1269 dprintf("\n"); 1270 break; 1271 1272 case F_FORW: 1273 dprintf(" %s", f->fu_forw_hname); 1274 switch (f->fu_forw_addr->ai_addr->sa_family) { 1275 case AF_INET: 1276 dprintf(":%d\n", 1277 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1278 break; 1279 #ifdef INET6 1280 case AF_INET6: 1281 dprintf(":%d\n", 1282 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1283 break; 1284 #endif 1285 default: 1286 dprintf("\n"); 1287 } 1288 /* check for local vs remote messages */ 1289 if (strcasecmp(f->f_prevhost, LocalHostName)) 1290 l = snprintf(line, sizeof line - 1, 1291 "<%d>%.15s Forwarded from %s: %s", 1292 f->f_prevpri, (char *)iov[0].iov_base, 1293 f->f_prevhost, (char *)iov[5].iov_base); 1294 else 1295 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1296 f->f_prevpri, (char *)iov[0].iov_base, 1297 (char *)iov[5].iov_base); 1298 if (l < 0) 1299 l = 0; 1300 else if (l > MAXLINE) 1301 l = MAXLINE; 1302 1303 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1304 struct socklist *sl; 1305 1306 STAILQ_FOREACH(sl, &shead, next) { 1307 if (sl->sl_ss.ss_family == AF_LOCAL || 1308 sl->sl_ss.ss_family == AF_UNSPEC || 1309 sl->sl_socket < 0) 1310 continue; 1311 lsent = sendto(sl->sl_socket, line, l, 0, 1312 r->ai_addr, r->ai_addrlen); 1313 if (lsent == l) 1314 break; 1315 } 1316 if (lsent == l && !send_to_all) 1317 break; 1318 } 1319 dprintf("lsent/l: %d/%d\n", lsent, l); 1320 if (lsent != l) { 1321 int e = errno; 1322 logerror("sendto"); 1323 errno = e; 1324 switch (errno) { 1325 case ENOBUFS: 1326 case ENETDOWN: 1327 case ENETUNREACH: 1328 case EHOSTUNREACH: 1329 case EHOSTDOWN: 1330 case EADDRNOTAVAIL: 1331 break; 1332 /* case EBADF: */ 1333 /* case EACCES: */ 1334 /* case ENOTSOCK: */ 1335 /* case EFAULT: */ 1336 /* case EMSGSIZE: */ 1337 /* case EAGAIN: */ 1338 /* case ENOBUFS: */ 1339 /* case ECONNREFUSED: */ 1340 default: 1341 dprintf("removing entry: errno=%d\n", e); 1342 f->f_type = F_UNUSED; 1343 break; 1344 } 1345 } 1346 break; 1347 1348 case F_FILE: 1349 dprintf(" %s\n", f->fu_fname); 1350 iov[6] = (struct iovec){ 1351 .iov_base = lf, 1352 .iov_len = 1 1353 }; 1354 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1355 /* 1356 * If writev(2) fails for potentially transient errors 1357 * like the filesystem being full, ignore it. 1358 * Otherwise remove this logfile from the list. 1359 */ 1360 if (errno != ENOSPC) { 1361 int e = errno; 1362 close_filed(f); 1363 errno = e; 1364 logerror(f->fu_fname); 1365 } 1366 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1367 f->f_flags |= FFLAG_NEEDSYNC; 1368 needdofsync = 1; 1369 } 1370 break; 1371 1372 case F_PIPE: 1373 dprintf(" %s\n", f->fu_pipe_pname); 1374 iov[6] = (struct iovec){ 1375 .iov_base = lf, 1376 .iov_len = 1 1377 }; 1378 if (f->fu_pipe_pid == 0) { 1379 if ((f->f_file = p_open(f->fu_pipe_pname, 1380 &f->fu_pipe_pid)) < 0) { 1381 f->f_type = F_UNUSED; 1382 logerror(f->fu_pipe_pname); 1383 break; 1384 } 1385 } 1386 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1387 int e = errno; 1388 close_filed(f); 1389 if (f->fu_pipe_pid > 0) 1390 deadq_enter(f->fu_pipe_pid, 1391 f->fu_pipe_pname); 1392 f->fu_pipe_pid = 0; 1393 errno = e; 1394 logerror(f->fu_pipe_pname); 1395 } 1396 break; 1397 1398 case F_CONSOLE: 1399 if (flags & IGN_CONS) { 1400 dprintf(" (ignored)\n"); 1401 break; 1402 } 1403 /* FALLTHROUGH */ 1404 1405 case F_TTY: 1406 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1407 iov[6] = (struct iovec){ 1408 .iov_base = crlf, 1409 .iov_len = 2 1410 }; 1411 errno = 0; /* ttymsg() only sometimes returns an errno */ 1412 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1413 f->f_type = F_UNUSED; 1414 logerror(msgret); 1415 } 1416 break; 1417 1418 case F_USERS: 1419 case F_WALL: 1420 dprintf("\n"); 1421 iov[6] = (struct iovec){ 1422 .iov_base = crlf, 1423 .iov_len = 2 1424 }; 1425 wallmsg(f, iov, nitems(iov)); 1426 break; 1427 } 1428 f->f_prevcount = 0; 1429 free(wmsg); 1430 } 1431 1432 /* 1433 * WALLMSG -- Write a message to the world at large 1434 * 1435 * Write the specified message to either the entire 1436 * world, or a list of approved users. 1437 */ 1438 static void 1439 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1440 { 1441 static int reenter; /* avoid calling ourselves */ 1442 struct utmpx *ut; 1443 int i; 1444 const char *p; 1445 1446 if (reenter++) 1447 return; 1448 setutxent(); 1449 /* NOSTRICT */ 1450 while ((ut = getutxent()) != NULL) { 1451 if (ut->ut_type != USER_PROCESS) 1452 continue; 1453 if (f->f_type == F_WALL) { 1454 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1455 TTYMSGTIME)) != NULL) { 1456 errno = 0; /* already in msg */ 1457 logerror(p); 1458 } 1459 continue; 1460 } 1461 /* should we send the message to this user? */ 1462 for (i = 0; i < MAXUNAMES; i++) { 1463 if (!f->fu_uname[i][0]) 1464 break; 1465 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1466 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1467 TTYMSGTIME)) != NULL) { 1468 errno = 0; /* already in msg */ 1469 logerror(p); 1470 } 1471 break; 1472 } 1473 } 1474 } 1475 endutxent(); 1476 reenter = 0; 1477 } 1478 1479 /* 1480 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1481 */ 1482 static const char * 1483 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1484 { 1485 static char device[1024]; 1486 static char errbuf[1024]; 1487 struct stat sb; 1488 1489 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1490 1491 if (stat(device, &sb) < 0) { 1492 (void) snprintf(errbuf, sizeof(errbuf), 1493 "%s: %s", device, strerror(errno)); 1494 return (errbuf); 1495 } 1496 if ((sb.st_mode & S_IWGRP) == 0) 1497 /* Messages disabled. */ 1498 return (NULL); 1499 return ttymsg(iov, iovcnt, line, tmout); 1500 } 1501 1502 static void 1503 reapchild(int signo __unused) 1504 { 1505 int status; 1506 pid_t pid; 1507 struct filed *f; 1508 1509 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1510 if (!Initialized) 1511 /* Don't tell while we are initting. */ 1512 continue; 1513 1514 /* First, look if it's a process from the dead queue. */ 1515 if (deadq_removebypid(pid)) 1516 continue; 1517 1518 /* Now, look in list of active processes. */ 1519 STAILQ_FOREACH(f, &fhead, next) { 1520 if (f->f_type == F_PIPE && 1521 f->fu_pipe_pid == pid) { 1522 close_filed(f); 1523 f->fu_pipe_pid = 0; 1524 log_deadchild(pid, status, f->fu_pipe_pname); 1525 break; 1526 } 1527 } 1528 } 1529 } 1530 1531 /* 1532 * Return a printable representation of a host address. 1533 */ 1534 static const char * 1535 cvthname(struct sockaddr *f) 1536 { 1537 int error, hl; 1538 sigset_t omask, nmask; 1539 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1540 1541 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1542 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1543 NI_NUMERICHOST); 1544 if (error) { 1545 dprintf("Malformed from address %s\n", gai_strerror(error)); 1546 return ("???"); 1547 } 1548 dprintf("cvthname(%s)\n", ip); 1549 1550 if (!resolve) 1551 return (ip); 1552 1553 sigemptyset(&nmask); 1554 sigaddset(&nmask, SIGHUP); 1555 sigprocmask(SIG_BLOCK, &nmask, &omask); 1556 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1557 NULL, 0, NI_NAMEREQD); 1558 sigprocmask(SIG_SETMASK, &omask, NULL); 1559 if (error) { 1560 dprintf("Host name for your address (%s) unknown\n", ip); 1561 return (ip); 1562 } 1563 hl = strlen(hname); 1564 if (hl > 0 && hname[hl-1] == '.') 1565 hname[--hl] = '\0'; 1566 trimdomain(hname, hl); 1567 return (hname); 1568 } 1569 1570 static void 1571 dodie(int signo) 1572 { 1573 1574 WantDie = signo; 1575 } 1576 1577 static void 1578 domark(int signo __unused) 1579 { 1580 1581 MarkSet = 1; 1582 } 1583 1584 /* 1585 * Print syslogd errors some place. 1586 */ 1587 static void 1588 logerror(const char *type) 1589 { 1590 char buf[512]; 1591 static int recursed = 0; 1592 1593 /* If there's an error while trying to log an error, give up. */ 1594 if (recursed) 1595 return; 1596 recursed++; 1597 if (errno) 1598 (void)snprintf(buf, 1599 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1600 else 1601 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1602 errno = 0; 1603 dprintf("%s\n", buf); 1604 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1605 recursed--; 1606 } 1607 1608 static void 1609 die(int signo) 1610 { 1611 struct filed *f; 1612 struct socklist *sl; 1613 int was_initialized; 1614 char buf[100]; 1615 1616 was_initialized = Initialized; 1617 Initialized = 0; /* Don't log SIGCHLDs. */ 1618 STAILQ_FOREACH(f, &fhead, next) { 1619 /* flush any pending output */ 1620 if (f->f_prevcount) 1621 fprintlog(f, 0, (char *)NULL); 1622 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) { 1623 close_filed(f); 1624 f->fu_pipe_pid = 0; 1625 } 1626 } 1627 Initialized = was_initialized; 1628 if (signo) { 1629 dprintf("syslogd: exiting on signal %d\n", signo); 1630 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1631 errno = 0; 1632 logerror(buf); 1633 } 1634 STAILQ_FOREACH(sl, &shead, next) { 1635 if (sl->sl_ss.ss_family == AF_LOCAL) 1636 unlink(sl->sl_peer->pe_name); 1637 } 1638 pidfile_remove(pfh); 1639 1640 exit(1); 1641 } 1642 1643 static int 1644 configfiles(const struct dirent *dp) 1645 { 1646 const char *p; 1647 size_t ext_len; 1648 1649 if (dp->d_name[0] == '.') 1650 return (0); 1651 1652 ext_len = sizeof(include_ext) -1; 1653 1654 if (dp->d_namlen <= ext_len) 1655 return (0); 1656 1657 p = &dp->d_name[dp->d_namlen - ext_len]; 1658 if (strcmp(p, include_ext) != 0) 1659 return (0); 1660 1661 return (1); 1662 } 1663 1664 static void 1665 readconfigfile(FILE *cf, int allow_includes) 1666 { 1667 FILE *cf2; 1668 struct filed *f; 1669 struct dirent **ent; 1670 char cline[LINE_MAX]; 1671 char host[MAXHOSTNAMELEN]; 1672 char prog[LINE_MAX]; 1673 char file[MAXPATHLEN]; 1674 char *p, *tmp; 1675 int i, nents; 1676 size_t include_len; 1677 1678 /* 1679 * Foreach line in the conf table, open that file. 1680 */ 1681 include_len = sizeof(include_str) -1; 1682 (void)strlcpy(host, "*", sizeof(host)); 1683 (void)strlcpy(prog, "*", sizeof(prog)); 1684 while (fgets(cline, sizeof(cline), cf) != NULL) { 1685 /* 1686 * check for end-of-section, comments, strip off trailing 1687 * spaces and newline character. #!prog is treated specially: 1688 * following lines apply only to that program. 1689 */ 1690 for (p = cline; isspace(*p); ++p) 1691 continue; 1692 if (*p == 0) 1693 continue; 1694 if (allow_includes && 1695 strncmp(p, include_str, include_len) == 0 && 1696 isspace(p[include_len])) { 1697 p += include_len; 1698 while (isspace(*p)) 1699 p++; 1700 tmp = p; 1701 while (*tmp != '\0' && !isspace(*tmp)) 1702 tmp++; 1703 *tmp = '\0'; 1704 dprintf("Trying to include files in '%s'\n", p); 1705 nents = scandir(p, &ent, configfiles, alphasort); 1706 if (nents == -1) { 1707 dprintf("Unable to open '%s': %s\n", p, 1708 strerror(errno)); 1709 continue; 1710 } 1711 for (i = 0; i < nents; i++) { 1712 if (snprintf(file, sizeof(file), "%s/%s", p, 1713 ent[i]->d_name) >= (int)sizeof(file)) { 1714 dprintf("ignoring path too long: " 1715 "'%s/%s'\n", p, ent[i]->d_name); 1716 free(ent[i]); 1717 continue; 1718 } 1719 free(ent[i]); 1720 cf2 = fopen(file, "r"); 1721 if (cf2 == NULL) 1722 continue; 1723 dprintf("reading %s\n", file); 1724 readconfigfile(cf2, 0); 1725 fclose(cf2); 1726 } 1727 free(ent); 1728 continue; 1729 } 1730 if (*p == '#') { 1731 p++; 1732 if (*p != '!' && *p != '+' && *p != '-') 1733 continue; 1734 } 1735 if (*p == '+' || *p == '-') { 1736 host[0] = *p++; 1737 while (isspace(*p)) 1738 p++; 1739 if ((!*p) || (*p == '*')) { 1740 (void)strlcpy(host, "*", sizeof(host)); 1741 continue; 1742 } 1743 if (*p == '@') 1744 p = LocalHostName; 1745 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1746 if (!isalnum(*p) && *p != '.' && *p != '-' 1747 && *p != ',' && *p != ':' && *p != '%') 1748 break; 1749 host[i] = *p++; 1750 } 1751 host[i] = '\0'; 1752 continue; 1753 } 1754 if (*p == '!') { 1755 p++; 1756 while (isspace(*p)) p++; 1757 if ((!*p) || (*p == '*')) { 1758 (void)strlcpy(prog, "*", sizeof(prog)); 1759 continue; 1760 } 1761 for (i = 0; i < LINE_MAX - 1; i++) { 1762 if (!isprint(p[i]) || isspace(p[i])) 1763 break; 1764 prog[i] = p[i]; 1765 } 1766 prog[i] = 0; 1767 continue; 1768 } 1769 for (p = cline + 1; *p != '\0'; p++) { 1770 if (*p != '#') 1771 continue; 1772 if (*(p - 1) == '\\') { 1773 strcpy(p - 1, p); 1774 p--; 1775 continue; 1776 } 1777 *p = '\0'; 1778 break; 1779 } 1780 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1781 cline[i] = '\0'; 1782 f = cfline(cline, prog, host); 1783 if (f != NULL) 1784 addfile(f); 1785 } 1786 } 1787 1788 /* 1789 * INIT -- Initialize syslogd from configuration table 1790 */ 1791 static void 1792 init(int signo) 1793 { 1794 int i; 1795 FILE *cf; 1796 struct filed *f; 1797 char *p; 1798 char oldLocalHostName[MAXHOSTNAMELEN]; 1799 char hostMsg[2*MAXHOSTNAMELEN+40]; 1800 char bootfileMsg[LINE_MAX]; 1801 1802 dprintf("init\n"); 1803 1804 /* 1805 * Load hostname (may have changed). 1806 */ 1807 if (signo != 0) 1808 (void)strlcpy(oldLocalHostName, LocalHostName, 1809 sizeof(oldLocalHostName)); 1810 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1811 err(EX_OSERR, "gethostname() failed"); 1812 if ((p = strchr(LocalHostName, '.')) != NULL) { 1813 *p++ = '\0'; 1814 LocalDomain = p; 1815 } else { 1816 LocalDomain = ""; 1817 } 1818 1819 /* 1820 * Load / reload timezone data (in case it changed). 1821 * 1822 * Just calling tzset() again does not work, the timezone code 1823 * caches the result. However, by setting the TZ variable, one 1824 * can defeat the caching and have the timezone code really 1825 * reload the timezone data. Respect any initial setting of 1826 * TZ, in case the system is configured specially. 1827 */ 1828 dprintf("loading timezone data via tzset()\n"); 1829 if (getenv("TZ")) { 1830 tzset(); 1831 } else { 1832 setenv("TZ", ":/etc/localtime", 1); 1833 tzset(); 1834 unsetenv("TZ"); 1835 } 1836 1837 /* 1838 * Close all open log files. 1839 */ 1840 Initialized = 0; 1841 STAILQ_FOREACH(f, &fhead, next) { 1842 /* flush any pending output */ 1843 if (f->f_prevcount) 1844 fprintlog(f, 0, (char *)NULL); 1845 1846 switch (f->f_type) { 1847 case F_FILE: 1848 case F_FORW: 1849 case F_CONSOLE: 1850 case F_TTY: 1851 close_filed(f); 1852 break; 1853 case F_PIPE: 1854 if (f->fu_pipe_pid > 0) { 1855 close_filed(f); 1856 deadq_enter(f->fu_pipe_pid, 1857 f->fu_pipe_pname); 1858 } 1859 f->fu_pipe_pid = 0; 1860 break; 1861 } 1862 } 1863 while(!STAILQ_EMPTY(&fhead)) { 1864 f = STAILQ_FIRST(&fhead); 1865 STAILQ_REMOVE_HEAD(&fhead, next); 1866 free(f->f_program); 1867 free(f->f_host); 1868 free(f); 1869 } 1870 1871 /* open the configuration file */ 1872 if ((cf = fopen(ConfFile, "r")) == NULL) { 1873 dprintf("cannot open %s\n", ConfFile); 1874 f = cfline("*.ERR\t/dev/console", "*", "*"); 1875 if (f != NULL) 1876 addfile(f); 1877 f = cfline("*.PANIC\t*", "*", "*"); 1878 if (f != NULL) 1879 addfile(f); 1880 Initialized = 1; 1881 1882 return; 1883 } 1884 1885 readconfigfile(cf, 1); 1886 1887 /* close the configuration file */ 1888 (void)fclose(cf); 1889 1890 Initialized = 1; 1891 1892 if (Debug) { 1893 int port; 1894 STAILQ_FOREACH(f, &fhead, next) { 1895 for (i = 0; i <= LOG_NFACILITIES; i++) 1896 if (f->f_pmask[i] == INTERNAL_NOPRI) 1897 printf("X "); 1898 else 1899 printf("%d ", f->f_pmask[i]); 1900 printf("%s: ", TypeNames[f->f_type]); 1901 switch (f->f_type) { 1902 case F_FILE: 1903 printf("%s", f->fu_fname); 1904 break; 1905 1906 case F_CONSOLE: 1907 case F_TTY: 1908 printf("%s%s", _PATH_DEV, f->fu_fname); 1909 break; 1910 1911 case F_FORW: 1912 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1913 if (port != 514) { 1914 printf("%s:%d", 1915 f->fu_forw_hname, port); 1916 } else { 1917 printf("%s", f->fu_forw_hname); 1918 } 1919 break; 1920 1921 case F_PIPE: 1922 printf("%s", f->fu_pipe_pname); 1923 break; 1924 1925 case F_USERS: 1926 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1927 printf("%s, ", f->fu_uname[i]); 1928 break; 1929 } 1930 if (f->f_program) 1931 printf(" (%s)", f->f_program); 1932 printf("\n"); 1933 } 1934 } 1935 1936 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1937 dprintf("syslogd: restarted\n"); 1938 /* 1939 * Log a change in hostname, but only on a restart. 1940 */ 1941 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1942 (void)snprintf(hostMsg, sizeof(hostMsg), 1943 "syslogd: hostname changed, \"%s\" to \"%s\"", 1944 oldLocalHostName, LocalHostName); 1945 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1946 dprintf("%s\n", hostMsg); 1947 } 1948 /* 1949 * Log the kernel boot file if we aren't going to use it as 1950 * the prefix, and if this is *not* a restart. 1951 */ 1952 if (signo == 0 && !use_bootfile) { 1953 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1954 "syslogd: kernel boot file is %s", bootfile); 1955 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1956 dprintf("%s\n", bootfileMsg); 1957 } 1958 } 1959 1960 /* 1961 * Crack a configuration file line 1962 */ 1963 static struct filed * 1964 cfline(const char *line, const char *prog, const char *host) 1965 { 1966 struct filed *f; 1967 struct addrinfo hints, *res; 1968 int error, i, pri, syncfile; 1969 const char *p, *q; 1970 char *bp; 1971 char buf[MAXLINE], ebuf[100]; 1972 1973 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1974 1975 f = calloc(1, sizeof(*f)); 1976 if (f == NULL) { 1977 logerror("malloc"); 1978 exit(1); 1979 } 1980 errno = 0; /* keep strerror() stuff out of logerror messages */ 1981 1982 for (i = 0; i <= LOG_NFACILITIES; i++) 1983 f->f_pmask[i] = INTERNAL_NOPRI; 1984 1985 /* save hostname if any */ 1986 if (host && *host == '*') 1987 host = NULL; 1988 if (host) { 1989 int hl; 1990 1991 f->f_host = strdup(host); 1992 if (f->f_host == NULL) { 1993 logerror("strdup"); 1994 exit(1); 1995 } 1996 hl = strlen(f->f_host); 1997 if (hl > 0 && f->f_host[hl-1] == '.') 1998 f->f_host[--hl] = '\0'; 1999 trimdomain(f->f_host, hl); 2000 } 2001 2002 /* save program name if any */ 2003 if (prog && *prog == '*') 2004 prog = NULL; 2005 if (prog) { 2006 f->f_program = strdup(prog); 2007 if (f->f_program == NULL) { 2008 logerror("strdup"); 2009 exit(1); 2010 } 2011 } 2012 2013 /* scan through the list of selectors */ 2014 for (p = line; *p && *p != '\t' && *p != ' ';) { 2015 int pri_done; 2016 int pri_cmp; 2017 int pri_invert; 2018 2019 /* find the end of this facility name list */ 2020 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2021 continue; 2022 2023 /* get the priority comparison */ 2024 pri_cmp = 0; 2025 pri_done = 0; 2026 pri_invert = 0; 2027 if (*q == '!') { 2028 pri_invert = 1; 2029 q++; 2030 } 2031 while (!pri_done) { 2032 switch (*q) { 2033 case '<': 2034 pri_cmp |= PRI_LT; 2035 q++; 2036 break; 2037 case '=': 2038 pri_cmp |= PRI_EQ; 2039 q++; 2040 break; 2041 case '>': 2042 pri_cmp |= PRI_GT; 2043 q++; 2044 break; 2045 default: 2046 pri_done++; 2047 break; 2048 } 2049 } 2050 2051 /* collect priority name */ 2052 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2053 *bp++ = *q++; 2054 *bp = '\0'; 2055 2056 /* skip cruft */ 2057 while (strchr(",;", *q)) 2058 q++; 2059 2060 /* decode priority name */ 2061 if (*buf == '*') { 2062 pri = LOG_PRIMASK; 2063 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2064 } else { 2065 /* Ignore trailing spaces. */ 2066 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2067 buf[i] = '\0'; 2068 2069 pri = decode(buf, prioritynames); 2070 if (pri < 0) { 2071 errno = 0; 2072 (void)snprintf(ebuf, sizeof ebuf, 2073 "unknown priority name \"%s\"", buf); 2074 logerror(ebuf); 2075 return (NULL); 2076 } 2077 } 2078 if (!pri_cmp) 2079 pri_cmp = (UniquePriority) 2080 ? (PRI_EQ) 2081 : (PRI_EQ | PRI_GT) 2082 ; 2083 if (pri_invert) 2084 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2085 2086 /* scan facilities */ 2087 while (*p && !strchr("\t.; ", *p)) { 2088 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2089 *bp++ = *p++; 2090 *bp = '\0'; 2091 2092 if (*buf == '*') { 2093 for (i = 0; i < LOG_NFACILITIES; i++) { 2094 f->f_pmask[i] = pri; 2095 f->f_pcmp[i] = pri_cmp; 2096 } 2097 } else { 2098 i = decode(buf, facilitynames); 2099 if (i < 0) { 2100 errno = 0; 2101 (void)snprintf(ebuf, sizeof ebuf, 2102 "unknown facility name \"%s\"", 2103 buf); 2104 logerror(ebuf); 2105 return (NULL); 2106 } 2107 f->f_pmask[i >> 3] = pri; 2108 f->f_pcmp[i >> 3] = pri_cmp; 2109 } 2110 while (*p == ',' || *p == ' ') 2111 p++; 2112 } 2113 2114 p = q; 2115 } 2116 2117 /* skip to action part */ 2118 while (*p == '\t' || *p == ' ') 2119 p++; 2120 2121 if (*p == '-') { 2122 syncfile = 0; 2123 p++; 2124 } else 2125 syncfile = 1; 2126 2127 switch (*p) { 2128 case '@': 2129 { 2130 char *tp; 2131 char endkey = ':'; 2132 /* 2133 * scan forward to see if there is a port defined. 2134 * so we can't use strlcpy.. 2135 */ 2136 i = sizeof(f->fu_forw_hname); 2137 tp = f->fu_forw_hname; 2138 p++; 2139 2140 /* 2141 * an ipv6 address should start with a '[' in that case 2142 * we should scan for a ']' 2143 */ 2144 if (*p == '[') { 2145 p++; 2146 endkey = ']'; 2147 } 2148 while (*p && (*p != endkey) && (i-- > 0)) { 2149 *tp++ = *p++; 2150 } 2151 if (endkey == ']' && *p == endkey) 2152 p++; 2153 *tp = '\0'; 2154 } 2155 /* See if we copied a domain and have a port */ 2156 if (*p == ':') 2157 p++; 2158 else 2159 p = NULL; 2160 2161 hints = (struct addrinfo){ 2162 .ai_family = family, 2163 .ai_socktype = SOCK_DGRAM 2164 }; 2165 error = getaddrinfo(f->fu_forw_hname, 2166 p ? p : "syslog", &hints, &res); 2167 if (error) { 2168 logerror(gai_strerror(error)); 2169 break; 2170 } 2171 f->fu_forw_addr = res; 2172 f->f_type = F_FORW; 2173 break; 2174 2175 case '/': 2176 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2177 f->f_type = F_UNUSED; 2178 logerror(p); 2179 break; 2180 } 2181 if (syncfile) 2182 f->f_flags |= FFLAG_SYNC; 2183 if (isatty(f->f_file)) { 2184 if (strcmp(p, ctty) == 0) 2185 f->f_type = F_CONSOLE; 2186 else 2187 f->f_type = F_TTY; 2188 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2189 sizeof(f->fu_fname)); 2190 } else { 2191 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2192 f->f_type = F_FILE; 2193 } 2194 break; 2195 2196 case '|': 2197 f->fu_pipe_pid = 0; 2198 (void)strlcpy(f->fu_pipe_pname, p + 1, 2199 sizeof(f->fu_pipe_pname)); 2200 f->f_type = F_PIPE; 2201 break; 2202 2203 case '*': 2204 f->f_type = F_WALL; 2205 break; 2206 2207 default: 2208 for (i = 0; i < MAXUNAMES && *p; i++) { 2209 for (q = p; *q && *q != ','; ) 2210 q++; 2211 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2212 if ((q - p) >= MAXLOGNAME) 2213 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2214 else 2215 f->fu_uname[i][q - p] = '\0'; 2216 while (*q == ',' || *q == ' ') 2217 q++; 2218 p = q; 2219 } 2220 f->f_type = F_USERS; 2221 break; 2222 } 2223 return (f); 2224 } 2225 2226 2227 /* 2228 * Decode a symbolic name to a numeric value 2229 */ 2230 static int 2231 decode(const char *name, const CODE *codetab) 2232 { 2233 const CODE *c; 2234 char *p, buf[40]; 2235 2236 if (isdigit(*name)) 2237 return (atoi(name)); 2238 2239 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2240 if (isupper(*name)) 2241 *p = tolower(*name); 2242 else 2243 *p = *name; 2244 } 2245 *p = '\0'; 2246 for (c = codetab; c->c_name; c++) 2247 if (!strcmp(buf, c->c_name)) 2248 return (c->c_val); 2249 2250 return (-1); 2251 } 2252 2253 static void 2254 markit(void) 2255 { 2256 struct filed *f; 2257 struct deadq_entry *dq, *dq0; 2258 2259 now = time((time_t *)NULL); 2260 MarkSeq += TIMERINTVL; 2261 if (MarkSeq >= MarkInterval) { 2262 logmsg(LOG_INFO, "-- MARK --", 2263 LocalHostName, ADDDATE|MARK); 2264 MarkSeq = 0; 2265 } 2266 2267 STAILQ_FOREACH(f, &fhead, next) { 2268 if (f->f_prevcount && now >= REPEATTIME(f)) { 2269 dprintf("flush %s: repeated %d times, %d sec.\n", 2270 TypeNames[f->f_type], f->f_prevcount, 2271 repeatinterval[f->f_repeatcount]); 2272 fprintlog(f, 0, (char *)NULL); 2273 BACKOFF(f); 2274 } 2275 } 2276 2277 /* Walk the dead queue, and see if we should signal somebody. */ 2278 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2279 switch (dq->dq_timeout) { 2280 case 0: 2281 /* Already signalled once, try harder now. */ 2282 if (kill(dq->dq_pid, SIGKILL) != 0) 2283 (void)deadq_remove(dq); 2284 break; 2285 2286 case 1: 2287 /* 2288 * Timed out on dead queue, send terminate 2289 * signal. Note that we leave the removal 2290 * from the dead queue to reapchild(), which 2291 * will also log the event (unless the process 2292 * didn't even really exist, in case we simply 2293 * drop it from the dead queue). 2294 */ 2295 if (kill(dq->dq_pid, SIGTERM) != 0) 2296 (void)deadq_remove(dq); 2297 else 2298 dq->dq_timeout--; 2299 break; 2300 default: 2301 dq->dq_timeout--; 2302 } 2303 } 2304 MarkSet = 0; 2305 (void)alarm(TIMERINTVL); 2306 } 2307 2308 /* 2309 * fork off and become a daemon, but wait for the child to come online 2310 * before returing to the parent, or we get disk thrashing at boot etc. 2311 * Set a timer so we don't hang forever if it wedges. 2312 */ 2313 static int 2314 waitdaemon(int maxwait) 2315 { 2316 int fd; 2317 int status; 2318 pid_t pid, childpid; 2319 2320 switch (childpid = fork()) { 2321 case -1: 2322 return (-1); 2323 case 0: 2324 break; 2325 default: 2326 signal(SIGALRM, timedout); 2327 alarm(maxwait); 2328 while ((pid = wait3(&status, 0, NULL)) != -1) { 2329 if (WIFEXITED(status)) 2330 errx(1, "child pid %d exited with return code %d", 2331 pid, WEXITSTATUS(status)); 2332 if (WIFSIGNALED(status)) 2333 errx(1, "child pid %d exited on signal %d%s", 2334 pid, WTERMSIG(status), 2335 WCOREDUMP(status) ? " (core dumped)" : 2336 ""); 2337 if (pid == childpid) /* it's gone... */ 2338 break; 2339 } 2340 exit(0); 2341 } 2342 2343 if (setsid() == -1) 2344 return (-1); 2345 2346 (void)chdir("/"); 2347 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2348 (void)dup2(fd, STDIN_FILENO); 2349 (void)dup2(fd, STDOUT_FILENO); 2350 (void)dup2(fd, STDERR_FILENO); 2351 closefrom(STDERR_FILENO + 1); 2352 } 2353 return (getppid()); 2354 } 2355 2356 /* 2357 * We get a SIGALRM from the child when it's running and finished doing it's 2358 * fsync()'s or O_SYNC writes for all the boot messages. 2359 * 2360 * We also get a signal from the kernel if the timer expires, so check to 2361 * see what happened. 2362 */ 2363 static void 2364 timedout(int sig __unused) 2365 { 2366 int left; 2367 left = alarm(0); 2368 signal(SIGALRM, SIG_DFL); 2369 if (left == 0) 2370 errx(1, "timed out waiting for child"); 2371 else 2372 _exit(0); 2373 } 2374 2375 /* 2376 * Add `s' to the list of allowable peer addresses to accept messages 2377 * from. 2378 * 2379 * `s' is a string in the form: 2380 * 2381 * [*]domainname[:{servicename|portnumber|*}] 2382 * 2383 * or 2384 * 2385 * netaddr/maskbits[:{servicename|portnumber|*}] 2386 * 2387 * Returns -1 on error, 0 if the argument was valid. 2388 */ 2389 static int 2390 allowaddr(char *s) 2391 { 2392 char *cp1, *cp2; 2393 struct allowedpeer *ap; 2394 struct servent *se; 2395 int masklen = -1; 2396 struct addrinfo hints, *res; 2397 #ifdef INET 2398 in_addr_t *addrp, *maskp; 2399 #endif 2400 #ifdef INET6 2401 uint32_t *addr6p, *mask6p; 2402 #endif 2403 char ip[NI_MAXHOST]; 2404 2405 ap = calloc(1, sizeof(*ap)); 2406 if (ap == NULL) 2407 err(1, "malloc failed"); 2408 2409 #ifdef INET6 2410 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2411 #endif 2412 cp1 = s; 2413 if ((cp1 = strrchr(cp1, ':'))) { 2414 /* service/port provided */ 2415 *cp1++ = '\0'; 2416 if (strlen(cp1) == 1 && *cp1 == '*') 2417 /* any port allowed */ 2418 ap->port = 0; 2419 else if ((se = getservbyname(cp1, "udp"))) { 2420 ap->port = ntohs(se->s_port); 2421 } else { 2422 ap->port = strtol(cp1, &cp2, 0); 2423 if (*cp2 != '\0') 2424 return (-1); /* port not numeric */ 2425 } 2426 } else { 2427 if ((se = getservbyname("syslog", "udp"))) 2428 ap->port = ntohs(se->s_port); 2429 else 2430 /* sanity, should not happen */ 2431 ap->port = 514; 2432 } 2433 2434 if ((cp1 = strchr(s, '/')) != NULL && 2435 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2436 *cp1 = '\0'; 2437 if ((masklen = atoi(cp1 + 1)) < 0) 2438 return (-1); 2439 } 2440 #ifdef INET6 2441 if (*s == '[') { 2442 cp2 = s + strlen(s) - 1; 2443 if (*cp2 == ']') { 2444 ++s; 2445 *cp2 = '\0'; 2446 } else { 2447 cp2 = NULL; 2448 } 2449 } else { 2450 cp2 = NULL; 2451 } 2452 #endif 2453 hints = (struct addrinfo){ 2454 .ai_family = PF_UNSPEC, 2455 .ai_socktype = SOCK_DGRAM, 2456 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2457 }; 2458 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2459 ap->isnumeric = 1; 2460 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2461 ap->a_mask = (struct sockaddr_storage){ 2462 .ss_family = res->ai_family, 2463 .ss_len = res->ai_addrlen 2464 }; 2465 switch (res->ai_family) { 2466 #ifdef INET 2467 case AF_INET: 2468 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2469 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2470 if (masklen < 0) { 2471 /* use default netmask */ 2472 if (IN_CLASSA(ntohl(*addrp))) 2473 *maskp = htonl(IN_CLASSA_NET); 2474 else if (IN_CLASSB(ntohl(*addrp))) 2475 *maskp = htonl(IN_CLASSB_NET); 2476 else 2477 *maskp = htonl(IN_CLASSC_NET); 2478 } else if (masklen == 0) { 2479 *maskp = 0; 2480 } else if (masklen <= 32) { 2481 /* convert masklen to netmask */ 2482 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2483 } else { 2484 freeaddrinfo(res); 2485 return (-1); 2486 } 2487 /* Lose any host bits in the network number. */ 2488 *addrp &= *maskp; 2489 break; 2490 #endif 2491 #ifdef INET6 2492 case AF_INET6: 2493 if (masklen > 128) { 2494 freeaddrinfo(res); 2495 return (-1); 2496 } 2497 if (masklen < 0) 2498 masklen = 128; 2499 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2500 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2501 /* convert masklen to netmask */ 2502 while (masklen > 0) { 2503 if (masklen < 32) { 2504 *mask6p = 2505 htonl(~(0xffffffff >> masklen)); 2506 *addr6p &= *mask6p; 2507 break; 2508 } else { 2509 *mask6p++ = 0xffffffff; 2510 addr6p++; 2511 masklen -= 32; 2512 } 2513 } 2514 break; 2515 #endif 2516 default: 2517 freeaddrinfo(res); 2518 return (-1); 2519 } 2520 freeaddrinfo(res); 2521 } else { 2522 /* arg `s' is domain name */ 2523 ap->isnumeric = 0; 2524 ap->a_name = s; 2525 if (cp1) 2526 *cp1 = '/'; 2527 #ifdef INET6 2528 if (cp2) { 2529 *cp2 = ']'; 2530 --s; 2531 } 2532 #endif 2533 } 2534 STAILQ_INSERT_TAIL(&aphead, ap, next); 2535 2536 if (Debug) { 2537 printf("allowaddr: rule "); 2538 if (ap->isnumeric) { 2539 printf("numeric, "); 2540 getnameinfo(sstosa(&ap->a_addr), 2541 (sstosa(&ap->a_addr))->sa_len, 2542 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2543 printf("addr = %s, ", ip); 2544 getnameinfo(sstosa(&ap->a_mask), 2545 (sstosa(&ap->a_mask))->sa_len, 2546 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2547 printf("mask = %s; ", ip); 2548 } else { 2549 printf("domainname = %s; ", ap->a_name); 2550 } 2551 printf("port = %d\n", ap->port); 2552 } 2553 return (0); 2554 } 2555 2556 /* 2557 * Validate that the remote peer has permission to log to us. 2558 */ 2559 static int 2560 validate(struct sockaddr *sa, const char *hname) 2561 { 2562 int i; 2563 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2564 struct allowedpeer *ap; 2565 #ifdef INET 2566 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2567 #endif 2568 #ifdef INET6 2569 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2570 #endif 2571 struct addrinfo hints, *res; 2572 u_short sport; 2573 int num = 0; 2574 2575 STAILQ_FOREACH(ap, &aphead, next) { 2576 num++; 2577 } 2578 dprintf("# of validation rule: %d\n", num); 2579 if (num == 0) 2580 /* traditional behaviour, allow everything */ 2581 return (1); 2582 2583 (void)strlcpy(name, hname, sizeof(name)); 2584 hints = (struct addrinfo){ 2585 .ai_family = PF_UNSPEC, 2586 .ai_socktype = SOCK_DGRAM, 2587 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2588 }; 2589 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2590 freeaddrinfo(res); 2591 else if (strchr(name, '.') == NULL) { 2592 strlcat(name, ".", sizeof name); 2593 strlcat(name, LocalDomain, sizeof name); 2594 } 2595 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2596 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2597 return (0); /* for safety, should not occur */ 2598 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2599 ip, port, name); 2600 sport = atoi(port); 2601 2602 /* now, walk down the list */ 2603 i = 0; 2604 STAILQ_FOREACH(ap, &aphead, next) { 2605 i++; 2606 if (ap->port != 0 && ap->port != sport) { 2607 dprintf("rejected in rule %d due to port mismatch.\n", 2608 i); 2609 continue; 2610 } 2611 2612 if (ap->isnumeric) { 2613 if (ap->a_addr.ss_family != sa->sa_family) { 2614 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2615 continue; 2616 } 2617 #ifdef INET 2618 else if (ap->a_addr.ss_family == AF_INET) { 2619 sin4 = satosin(sa); 2620 a4p = satosin(&ap->a_addr); 2621 m4p = satosin(&ap->a_mask); 2622 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2623 != a4p->sin_addr.s_addr) { 2624 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2625 continue; 2626 } 2627 } 2628 #endif 2629 #ifdef INET6 2630 else if (ap->a_addr.ss_family == AF_INET6) { 2631 sin6 = satosin6(sa); 2632 a6p = satosin6(&ap->a_addr); 2633 m6p = satosin6(&ap->a_mask); 2634 if (a6p->sin6_scope_id != 0 && 2635 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2636 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2637 continue; 2638 } 2639 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2640 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2641 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2642 continue; 2643 } 2644 } 2645 #endif 2646 else 2647 continue; 2648 } else { 2649 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2650 FNM_NOMATCH) { 2651 dprintf("rejected in rule %d due to name " 2652 "mismatch.\n", i); 2653 continue; 2654 } 2655 } 2656 dprintf("accepted in rule %d.\n", i); 2657 return (1); /* hooray! */ 2658 } 2659 return (0); 2660 } 2661 2662 /* 2663 * Fairly similar to popen(3), but returns an open descriptor, as 2664 * opposed to a FILE *. 2665 */ 2666 static int 2667 p_open(const char *prog, pid_t *rpid) 2668 { 2669 int pfd[2], nulldesc; 2670 pid_t pid; 2671 sigset_t omask, mask; 2672 char *argv[4]; /* sh -c cmd NULL */ 2673 char errmsg[200]; 2674 2675 if (pipe(pfd) == -1) 2676 return (-1); 2677 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2678 /* we are royally screwed anyway */ 2679 return (-1); 2680 2681 sigemptyset(&mask); 2682 sigaddset(&mask, SIGALRM); 2683 sigaddset(&mask, SIGHUP); 2684 sigprocmask(SIG_BLOCK, &mask, &omask); 2685 switch ((pid = fork())) { 2686 case -1: 2687 sigprocmask(SIG_SETMASK, &omask, 0); 2688 close(nulldesc); 2689 return (-1); 2690 2691 case 0: 2692 argv[0] = strdup("sh"); 2693 argv[1] = strdup("-c"); 2694 argv[2] = strdup(prog); 2695 argv[3] = NULL; 2696 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2697 logerror("strdup"); 2698 exit(1); 2699 } 2700 2701 alarm(0); 2702 (void)setsid(); /* Avoid catching SIGHUPs. */ 2703 2704 /* 2705 * Throw away pending signals, and reset signal 2706 * behaviour to standard values. 2707 */ 2708 signal(SIGALRM, SIG_IGN); 2709 signal(SIGHUP, SIG_IGN); 2710 sigprocmask(SIG_SETMASK, &omask, 0); 2711 signal(SIGPIPE, SIG_DFL); 2712 signal(SIGQUIT, SIG_DFL); 2713 signal(SIGALRM, SIG_DFL); 2714 signal(SIGHUP, SIG_DFL); 2715 2716 dup2(pfd[0], STDIN_FILENO); 2717 dup2(nulldesc, STDOUT_FILENO); 2718 dup2(nulldesc, STDERR_FILENO); 2719 closefrom(STDERR_FILENO + 1); 2720 2721 (void)execvp(_PATH_BSHELL, argv); 2722 _exit(255); 2723 } 2724 2725 sigprocmask(SIG_SETMASK, &omask, 0); 2726 close(nulldesc); 2727 close(pfd[0]); 2728 /* 2729 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2730 * supposed to get an EWOULDBLOCK on writev(2), which is 2731 * caught by the logic above anyway, which will in turn close 2732 * the pipe, and fork a new logging subprocess if necessary. 2733 * The stale subprocess will be killed some time later unless 2734 * it terminated itself due to closing its input pipe (so we 2735 * get rid of really dead puppies). 2736 */ 2737 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2738 /* This is bad. */ 2739 (void)snprintf(errmsg, sizeof errmsg, 2740 "Warning: cannot change pipe to PID %d to " 2741 "non-blocking behaviour.", 2742 (int)pid); 2743 logerror(errmsg); 2744 } 2745 *rpid = pid; 2746 return (pfd[1]); 2747 } 2748 2749 static void 2750 deadq_enter(pid_t pid, const char *name) 2751 { 2752 struct deadq_entry *dq; 2753 int status; 2754 2755 /* 2756 * Be paranoid, if we can't signal the process, don't enter it 2757 * into the dead queue (perhaps it's already dead). If possible, 2758 * we try to fetch and log the child's status. 2759 */ 2760 if (kill(pid, 0) != 0) { 2761 if (waitpid(pid, &status, WNOHANG) > 0) 2762 log_deadchild(pid, status, name); 2763 return; 2764 } 2765 2766 dq = malloc(sizeof(*dq)); 2767 if (dq == NULL) { 2768 logerror("malloc"); 2769 exit(1); 2770 } 2771 *dq = (struct deadq_entry){ 2772 .dq_pid = pid, 2773 .dq_timeout = DQ_TIMO_INIT 2774 }; 2775 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2776 } 2777 2778 static int 2779 deadq_remove(struct deadq_entry *dq) 2780 { 2781 if (dq != NULL) { 2782 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2783 free(dq); 2784 return (1); 2785 } 2786 2787 return (0); 2788 } 2789 2790 static int 2791 deadq_removebypid(pid_t pid) 2792 { 2793 struct deadq_entry *dq; 2794 2795 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2796 if (dq->dq_pid == pid) 2797 break; 2798 } 2799 return (deadq_remove(dq)); 2800 } 2801 2802 static void 2803 log_deadchild(pid_t pid, int status, const char *name) 2804 { 2805 int code; 2806 char buf[256]; 2807 const char *reason; 2808 2809 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2810 if (WIFSIGNALED(status)) { 2811 reason = "due to signal"; 2812 code = WTERMSIG(status); 2813 } else { 2814 reason = "with status"; 2815 code = WEXITSTATUS(status); 2816 if (code == 0) 2817 return; 2818 } 2819 (void)snprintf(buf, sizeof buf, 2820 "Logging subprocess %d (%s) exited %s %d.", 2821 pid, name, reason, code); 2822 logerror(buf); 2823 } 2824 2825 static int 2826 socksetup(struct peer *pe) 2827 { 2828 struct addrinfo hints, *res, *res0; 2829 int error; 2830 char *cp; 2831 /* 2832 * We have to handle this case for backwards compatibility: 2833 * If there are two (or more) colons but no '[' and ']', 2834 * assume this is an inet6 address without a service. 2835 */ 2836 if (pe->pe_name != NULL) { 2837 #ifdef INET6 2838 if (pe->pe_name[0] == '[' && 2839 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2840 pe->pe_name = &pe->pe_name[1]; 2841 *cp = '\0'; 2842 if (cp[1] == ':' && cp[2] != '\0') 2843 pe->pe_serv = cp + 2; 2844 } else { 2845 #endif 2846 cp = strchr(pe->pe_name, ':'); 2847 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2848 *cp = '\0'; 2849 if (cp[1] != '\0') 2850 pe->pe_serv = cp + 1; 2851 if (cp == pe->pe_name) 2852 pe->pe_name = NULL; 2853 } 2854 #ifdef INET6 2855 } 2856 #endif 2857 } 2858 hints = (struct addrinfo){ 2859 .ai_family = AF_UNSPEC, 2860 .ai_socktype = SOCK_DGRAM, 2861 .ai_flags = AI_PASSIVE 2862 }; 2863 dprintf("Try %s\n", pe->pe_name); 2864 if (pe->pe_serv == NULL) 2865 pe->pe_serv = "syslog"; 2866 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2867 if (error) { 2868 logerror(gai_strerror(error)); 2869 errno = 0; 2870 die(0); 2871 } 2872 for (res = res0; res != NULL; res = res->ai_next) { 2873 int s; 2874 2875 if (res->ai_family == AF_LOCAL) 2876 unlink(pe->pe_name); 2877 else if (SecureMode > 1) { 2878 /* Only AF_LOCAL in secure mode. */ 2879 continue; 2880 } 2881 if (family != AF_UNSPEC && res->ai_family != family) 2882 continue; 2883 2884 s = socket(res->ai_family, res->ai_socktype, 2885 res->ai_protocol); 2886 if (s < 0) { 2887 logerror("socket"); 2888 error++; 2889 continue; 2890 } 2891 #ifdef INET6 2892 if (res->ai_family == AF_INET6) { 2893 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2894 &(int){1}, sizeof(int)) < 0) { 2895 logerror("setsockopt(IPV6_V6ONLY)"); 2896 close(s); 2897 error++; 2898 continue; 2899 } 2900 } 2901 #endif 2902 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2903 &(int){1}, sizeof(int)) < 0) { 2904 logerror("setsockopt(SO_REUSEADDR)"); 2905 close(s); 2906 error++; 2907 continue; 2908 } 2909 /* 2910 * RFC 3164 recommends that client side message 2911 * should come from the privileged syslogd port. 2912 * 2913 * If the system administrator choose not to obey 2914 * this, we can skip the bind() step so that the 2915 * system will choose a port for us. 2916 */ 2917 if (NoBind == 0) { 2918 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 2919 logerror("bind"); 2920 close(s); 2921 error++; 2922 continue; 2923 } 2924 if (SecureMode == 0) 2925 increase_rcvbuf(s); 2926 } 2927 if (res->ai_family == AF_LOCAL && 2928 chmod(pe->pe_name, pe->pe_mode) < 0) { 2929 dprintf("chmod %s: %s\n", pe->pe_name, 2930 strerror(errno)); 2931 close(s); 2932 error++; 2933 continue; 2934 } 2935 dprintf("new socket fd is %d\n", s); 2936 listen(s, 5); 2937 dprintf("shutdown\n"); 2938 if (SecureMode) { 2939 /* Forbid communication in secure mode. */ 2940 if (shutdown(s, SHUT_RD) < 0 && 2941 errno != ENOTCONN) { 2942 logerror("shutdown"); 2943 if (!Debug) 2944 die(0); 2945 } 2946 dprintf("listening on inet socket\n"); 2947 } else 2948 dprintf("sending on inet socket\n"); 2949 addsock(res->ai_addr, res->ai_addrlen, 2950 &(struct socklist){ 2951 .sl_socket = s, 2952 .sl_peer = pe, 2953 .sl_recv = socklist_recv_sock 2954 }); 2955 } 2956 freeaddrinfo(res0); 2957 2958 return(error); 2959 } 2960 2961 static void 2962 increase_rcvbuf(int fd) 2963 { 2964 socklen_t len; 2965 2966 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 2967 &(socklen_t){sizeof(len)}) == 0) { 2968 if (len < RCVBUF_MINSIZE) { 2969 len = RCVBUF_MINSIZE; 2970 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2971 } 2972 } 2973 } 2974