1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 /* 48 * syslogd -- log system messages 49 * 50 * This program implements a system log. It takes a series of lines. 51 * Each line may have a priority, signified as "<n>" as 52 * the first characters of the line. If this is 53 * not present, a default priority is used. 54 * 55 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 56 * cause it to reread its configuration file. 57 * 58 * Defined Constants: 59 * 60 * MAXLINE -- the maximum line length that can be handled. 61 * DEFUPRI -- the default priority for user messages 62 * DEFSPRI -- the default priority for kernel messages 63 * 64 * Author: Eric Allman 65 * extensive changes by Ralph Campbell 66 * more extensive changes by Eric Allman (again) 67 * Extension to log by program name as well as facility and priority 68 * by Peter da Silva. 69 * -u and -v by Harlan Stenn. 70 * Priority comparison code by Harlan Stenn. 71 */ 72 73 /* Maximum number of characters in time of last occurrence */ 74 #define MAXDATELEN 16 75 #define MAXLINE 1024 /* maximum line length */ 76 #define MAXSVLINE MAXLINE /* maximum saved line length */ 77 #define DEFUPRI (LOG_USER|LOG_NOTICE) 78 #define DEFSPRI (LOG_KERN|LOG_CRIT) 79 #define TIMERINTVL 30 /* interval for checking flush, mark */ 80 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 81 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 82 83 #include <sys/param.h> 84 #include <sys/ioctl.h> 85 #include <sys/mman.h> 86 #include <sys/queue.h> 87 #include <sys/resource.h> 88 #include <sys/socket.h> 89 #include <sys/stat.h> 90 #include <sys/syslimits.h> 91 #include <sys/time.h> 92 #include <sys/uio.h> 93 #include <sys/un.h> 94 #include <sys/wait.h> 95 96 #if defined(INET) || defined(INET6) 97 #include <netinet/in.h> 98 #include <arpa/inet.h> 99 #endif 100 #include <netdb.h> 101 102 #include <ctype.h> 103 #include <dirent.h> 104 #include <err.h> 105 #include <errno.h> 106 #include <fcntl.h> 107 #include <fnmatch.h> 108 #include <libutil.h> 109 #include <limits.h> 110 #include <paths.h> 111 #include <signal.h> 112 #include <stdio.h> 113 #include <stdlib.h> 114 #include <string.h> 115 #include <sysexits.h> 116 #include <unistd.h> 117 #include <utmpx.h> 118 119 #include "pathnames.h" 120 #include "ttymsg.h" 121 122 #define SYSLOG_NAMES 123 #include <sys/syslog.h> 124 125 static const char *ConfFile = _PATH_LOGCONF; 126 static const char *PidFile = _PATH_LOGPID; 127 static const char ctty[] = _PATH_CONSOLE; 128 static const char include_str[] = "include"; 129 static const char include_ext[] = ".conf"; 130 131 #define dprintf if (Debug) printf 132 133 #define MAXUNAMES 20 /* maximum number of user names */ 134 135 #define sstosa(ss) ((struct sockaddr *)(ss)) 136 #ifdef INET 137 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 138 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 139 #endif 140 #ifdef INET6 141 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 142 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 143 #define s6_addr32 __u6_addr.__u6_addr32 144 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 145 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 146 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 147 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 148 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 149 #endif 150 /* 151 * List of peers and sockets for binding. 152 */ 153 struct peer { 154 const char *pe_name; 155 const char *pe_serv; 156 mode_t pe_mode; 157 STAILQ_ENTRY(peer) next; 158 }; 159 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 160 161 struct socklist { 162 struct sockaddr_storage sl_ss; 163 int sl_socket; 164 struct peer *sl_peer; 165 int (*sl_recv)(struct socklist *); 166 STAILQ_ENTRY(socklist) next; 167 }; 168 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 169 170 /* 171 * Flags to logmsg(). 172 */ 173 174 #define IGN_CONS 0x001 /* don't print on console */ 175 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 176 #define ADDDATE 0x004 /* add a date to the message */ 177 #define MARK 0x008 /* this message is a mark */ 178 #define ISKERNEL 0x010 /* kernel generated message */ 179 180 /* 181 * This structure represents the files that will have log 182 * copies printed. 183 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 184 * or if f_type if F_PIPE and f_pid > 0. 185 */ 186 187 struct filed { 188 STAILQ_ENTRY(filed) next; /* next in linked list */ 189 short f_type; /* entry type, see below */ 190 short f_file; /* file descriptor */ 191 time_t f_time; /* time this was last written */ 192 char *f_host; /* host from which to recd. */ 193 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 194 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 195 #define PRI_LT 0x1 196 #define PRI_EQ 0x2 197 #define PRI_GT 0x4 198 char *f_program; /* program this applies to */ 199 union { 200 char f_uname[MAXUNAMES][MAXLOGNAME]; 201 struct { 202 char f_hname[MAXHOSTNAMELEN]; 203 struct addrinfo *f_addr; 204 205 } f_forw; /* forwarding address */ 206 char f_fname[MAXPATHLEN]; 207 struct { 208 char f_pname[MAXPATHLEN]; 209 pid_t f_pid; 210 } f_pipe; 211 } f_un; 212 #define fu_uname f_un.f_uname 213 #define fu_forw_hname f_un.f_forw.f_hname 214 #define fu_forw_addr f_un.f_forw.f_addr 215 #define fu_fname f_un.f_fname 216 #define fu_pipe_pname f_un.f_pipe.f_pname 217 #define fu_pipe_pid f_un.f_pipe.f_pid 218 char f_prevline[MAXSVLINE]; /* last message logged */ 219 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 220 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 221 int f_prevpri; /* pri of f_prevline */ 222 int f_prevlen; /* length of f_prevline */ 223 int f_prevcount; /* repetition cnt of prevline */ 224 u_int f_repeatcount; /* number of "repeated" msgs */ 225 int f_flags; /* file-specific flags */ 226 #define FFLAG_SYNC 0x01 227 #define FFLAG_NEEDSYNC 0x02 228 }; 229 230 /* 231 * Queue of about-to-be dead processes we should watch out for. 232 */ 233 struct deadq_entry { 234 pid_t dq_pid; 235 int dq_timeout; 236 TAILQ_ENTRY(deadq_entry) dq_entries; 237 }; 238 static TAILQ_HEAD(, deadq_entry) deadq_head = 239 TAILQ_HEAD_INITIALIZER(deadq_head); 240 241 /* 242 * The timeout to apply to processes waiting on the dead queue. Unit 243 * of measure is `mark intervals', i.e. 20 minutes by default. 244 * Processes on the dead queue will be terminated after that time. 245 */ 246 247 #define DQ_TIMO_INIT 2 248 249 /* 250 * Struct to hold records of network addresses that are allowed to log 251 * to us. 252 */ 253 struct allowedpeer { 254 int isnumeric; 255 u_short port; 256 union { 257 struct { 258 struct sockaddr_storage addr; 259 struct sockaddr_storage mask; 260 } numeric; 261 char *name; 262 } u; 263 #define a_addr u.numeric.addr 264 #define a_mask u.numeric.mask 265 #define a_name u.name 266 STAILQ_ENTRY(allowedpeer) next; 267 }; 268 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 269 270 271 /* 272 * Intervals at which we flush out "message repeated" messages, 273 * in seconds after previous message is logged. After each flush, 274 * we move to the next interval until we reach the largest. 275 */ 276 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 277 #define MAXREPEAT (nitems(repeatinterval) - 1) 278 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 279 #define BACKOFF(f) do { \ 280 if (++(f)->f_repeatcount > MAXREPEAT) \ 281 (f)->f_repeatcount = MAXREPEAT; \ 282 } while (0) 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[] = { 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 Initialized; /* set when we have initialized ourselves */ 309 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 310 static int MarkSeq; /* mark sequence number */ 311 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 312 static int SecureMode; /* when true, receive only unix domain socks */ 313 #ifdef INET6 314 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 315 #else 316 static int family = PF_INET; /* protocol family (IPv4 only) */ 317 #endif 318 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 319 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 320 static int use_bootfile; /* log entire bootfile for every kern msg */ 321 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 322 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 323 324 static char bootfile[MAXLINE+1]; /* booted kernel file */ 325 326 static int RemoteAddDate; /* Always set the date on remote messages */ 327 328 static int UniquePriority; /* Only log specified priority? */ 329 static int LogFacPri; /* Put facility and priority in log message: */ 330 /* 0=no, 1=numeric, 2=names */ 331 static int KeepKernFac; /* Keep remotely logged kernel facility */ 332 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 333 static struct pidfh *pfh; 334 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 335 336 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 337 338 static int allowaddr(char *); 339 static int addfile(struct filed *); 340 static int addpeer(struct peer *); 341 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 342 static struct filed *cfline(const char *, const char *, const char *); 343 static const char *cvthname(struct sockaddr *); 344 static void deadq_enter(pid_t, const char *); 345 static int deadq_remove(struct deadq_entry *); 346 static int deadq_removebypid(pid_t); 347 static int decode(const char *, const CODE *); 348 static void die(int) __dead2; 349 static void dodie(int); 350 static void dofsync(void); 351 static void domark(int); 352 static void fprintlog(struct filed *, int, const char *); 353 static void init(int); 354 static void logerror(const char *); 355 static void logmsg(int, const char *, const char *, int); 356 static void log_deadchild(pid_t, int, const char *); 357 static void markit(void); 358 static int socksetup(struct peer *); 359 static int socklist_recv_file(struct socklist *); 360 static int socklist_recv_sock(struct socklist *); 361 static int socklist_recv_signal(struct socklist *); 362 static void sighandler(int); 363 static int skip_message(const char *, const char *, int); 364 static void printline(const char *, char *, int); 365 static void printsys(char *); 366 static int p_open(const char *, pid_t *); 367 static void reapchild(int); 368 static const char *ttymsg_check(struct iovec *, int, char *, int); 369 static void usage(void); 370 static int validate(struct sockaddr *, const char *); 371 static void unmapped(struct sockaddr *); 372 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 373 static int waitdaemon(int); 374 static void timedout(int); 375 static void increase_rcvbuf(int); 376 377 static void 378 close_filed(struct filed *f) 379 { 380 381 if (f == NULL || f->f_file == -1) 382 return; 383 384 switch (f->f_type) { 385 case F_FILE: 386 case F_TTY: 387 case F_CONSOLE: 388 case F_FORW: 389 f->f_type = F_UNUSED; 390 break; 391 case F_PIPE: 392 f->fu_pipe_pid = 0; 393 break; 394 } 395 (void)close(f->f_file); 396 f->f_file = -1; 397 } 398 399 static int 400 addfile(struct filed *f0) 401 { 402 struct filed *f; 403 404 f = calloc(1, sizeof(*f)); 405 if (f == NULL) 406 err(1, "malloc failed"); 407 *f = *f0; 408 STAILQ_INSERT_TAIL(&fhead, f, next); 409 410 return (0); 411 } 412 413 static int 414 addpeer(struct peer *pe0) 415 { 416 struct peer *pe; 417 418 pe = calloc(1, sizeof(*pe)); 419 if (pe == NULL) 420 err(1, "malloc failed"); 421 *pe = *pe0; 422 STAILQ_INSERT_TAIL(&pqueue, pe, next); 423 424 return (0); 425 } 426 427 static int 428 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 429 { 430 struct socklist *sl; 431 432 sl = calloc(1, sizeof(*sl)); 433 if (sl == NULL) 434 err(1, "malloc failed"); 435 *sl = *sl0; 436 if (sa != NULL && sa_len > 0) 437 memcpy(&sl->sl_ss, sa, sa_len); 438 STAILQ_INSERT_TAIL(&shead, sl, next); 439 440 return (0); 441 } 442 443 int 444 main(int argc, char *argv[]) 445 { 446 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 447 fd_set *fdsr = NULL; 448 struct timeval tv, *tvp; 449 struct peer *pe; 450 struct socklist *sl; 451 pid_t ppid = 1, spid; 452 char *p; 453 454 if (madvise(NULL, 0, MADV_PROTECT) != 0) 455 dprintf("madvise() failed: %s\n", strerror(errno)); 456 457 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 458 != -1) 459 switch (ch) { 460 #ifdef INET 461 case '4': 462 family = PF_INET; 463 break; 464 #endif 465 #ifdef INET6 466 case '6': 467 family = PF_INET6; 468 break; 469 #endif 470 case '8': 471 mask_C1 = 0; 472 break; 473 case 'A': 474 send_to_all++; 475 break; 476 case 'a': /* allow specific network addresses only */ 477 if (allowaddr(optarg) == -1) 478 usage(); 479 break; 480 case 'b': 481 bflag = 1; 482 p = strchr(optarg, ']'); 483 if (p != NULL) 484 p = strchr(p + 1, ':'); 485 else { 486 p = strchr(optarg, ':'); 487 if (p != NULL && strchr(p + 1, ':') != NULL) 488 p = NULL; /* backward compatibility */ 489 } 490 if (p == NULL) { 491 /* A hostname or filename only. */ 492 addpeer(&(struct peer){ 493 .pe_name = optarg, 494 .pe_serv = "syslog" 495 }); 496 } else { 497 /* The case of "name:service". */ 498 *p++ = '\0'; 499 addpeer(&(struct peer){ 500 .pe_serv = p, 501 .pe_name = (strlen(optarg) == 0) ? 502 NULL : optarg, 503 }); 504 } 505 break; 506 case 'c': 507 no_compress++; 508 break; 509 case 'C': 510 logflags |= O_CREAT; 511 break; 512 case 'd': /* debug */ 513 Debug++; 514 break; 515 case 'f': /* configuration file */ 516 ConfFile = optarg; 517 break; 518 case 'F': /* run in foreground instead of daemon */ 519 Foreground++; 520 break; 521 case 'k': /* keep remote kern fac */ 522 KeepKernFac = 1; 523 break; 524 case 'l': 525 case 'p': 526 case 'S': 527 { 528 long perml; 529 mode_t mode; 530 char *name, *ep; 531 532 if (ch == 'l') 533 mode = DEFFILEMODE; 534 else if (ch == 'p') { 535 mode = DEFFILEMODE; 536 pflag = 1; 537 } else if (ch == 'S') { 538 mode = S_IRUSR | S_IWUSR; 539 Sflag = 1; 540 } 541 if (optarg[0] == '/') 542 name = optarg; 543 else if ((name = strchr(optarg, ':')) != NULL) { 544 *name++ = '\0'; 545 if (name[0] != '/') 546 errx(1, "socket name must be absolute " 547 "path"); 548 if (isdigit(*optarg)) { 549 perml = strtol(optarg, &ep, 8); 550 if (*ep || perml < 0 || 551 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 552 errx(1, "invalid mode %s, exiting", 553 optarg); 554 mode = (mode_t )perml; 555 } else 556 errx(1, "invalid mode %s, exiting", 557 optarg); 558 } else 559 errx(1, "invalid filename %s, exiting", 560 optarg); 561 addpeer(&(struct peer){ 562 .pe_name = name, 563 .pe_mode = mode 564 }); 565 break; 566 } 567 case 'm': /* mark interval */ 568 MarkInterval = atoi(optarg) * 60; 569 break; 570 case 'N': 571 NoBind = 1; 572 SecureMode = 1; 573 break; 574 case 'n': 575 resolve = 0; 576 break; 577 case 'o': 578 use_bootfile = 1; 579 break; 580 case 'P': /* path for alt. PID */ 581 PidFile = optarg; 582 break; 583 case 's': /* no network mode */ 584 SecureMode++; 585 break; 586 case 'T': 587 RemoteAddDate = 1; 588 break; 589 case 'u': /* only log specified priority */ 590 UniquePriority++; 591 break; 592 case 'v': /* log facility and priority */ 593 LogFacPri++; 594 break; 595 default: 596 usage(); 597 } 598 if ((argc -= optind) != 0) 599 usage(); 600 601 /* Pipe to catch a signal during select(). */ 602 s = pipe2(sigpipe, O_CLOEXEC); 603 if (s < 0) { 604 err(1, "cannot open a pipe for signals"); 605 } else { 606 addsock(NULL, 0, &(struct socklist){ 607 .sl_socket = sigpipe[0], 608 .sl_recv = socklist_recv_signal 609 }); 610 } 611 612 /* Listen by default: /dev/klog. */ 613 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 614 if (s < 0) { 615 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 616 } else { 617 addsock(NULL, 0, &(struct socklist){ 618 .sl_socket = s, 619 .sl_recv = socklist_recv_file, 620 }); 621 } 622 /* Listen by default: *:514 if no -b flag. */ 623 if (bflag == 0) 624 addpeer(&(struct peer){ 625 .pe_serv = "syslog" 626 }); 627 /* Listen by default: /var/run/log if no -p flag. */ 628 if (pflag == 0) 629 addpeer(&(struct peer){ 630 .pe_name = _PATH_LOG, 631 .pe_mode = DEFFILEMODE, 632 }); 633 /* Listen by default: /var/run/logpriv if no -S flag. */ 634 if (Sflag == 0) 635 addpeer(&(struct peer){ 636 .pe_name = _PATH_LOG_PRIV, 637 .pe_mode = S_IRUSR | S_IWUSR, 638 }); 639 STAILQ_FOREACH(pe, &pqueue, next) 640 socksetup(pe); 641 642 pfh = pidfile_open(PidFile, 0600, &spid); 643 if (pfh == NULL) { 644 if (errno == EEXIST) 645 errx(1, "syslogd already running, pid: %d", spid); 646 warn("cannot open pid file"); 647 } 648 649 if ((!Foreground) && (!Debug)) { 650 ppid = waitdaemon(30); 651 if (ppid < 0) { 652 warn("could not become daemon"); 653 pidfile_remove(pfh); 654 exit(1); 655 } 656 } else if (Debug) 657 setlinebuf(stdout); 658 659 consfile.f_type = F_CONSOLE; 660 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 661 sizeof(consfile.fu_fname)); 662 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 663 (void)signal(SIGTERM, dodie); 664 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 665 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 666 (void)signal(SIGHUP, sighandler); 667 (void)signal(SIGCHLD, sighandler); 668 (void)signal(SIGALRM, domark); 669 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 670 (void)alarm(TIMERINTVL); 671 672 /* tuck my process id away */ 673 pidfile_write(pfh); 674 675 dprintf("off & running....\n"); 676 677 tvp = &tv; 678 tv.tv_sec = tv.tv_usec = 0; 679 680 STAILQ_FOREACH(sl, &shead, next) { 681 if (sl->sl_socket > fdsrmax) 682 fdsrmax = sl->sl_socket; 683 } 684 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 685 sizeof(fd_mask)); 686 if (fdsr == NULL) 687 errx(1, "calloc fd_set"); 688 689 for (;;) { 690 if (Initialized == 0) 691 init(0); 692 else if (WantInitialize) 693 init(WantInitialize); 694 if (WantReapchild) 695 reapchild(WantReapchild); 696 if (MarkSet) 697 markit(); 698 if (WantDie) { 699 free(fdsr); 700 die(WantDie); 701 } 702 703 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 704 sizeof(fd_mask)); 705 706 STAILQ_FOREACH(sl, &shead, next) { 707 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 708 FD_SET(sl->sl_socket, fdsr); 709 } 710 i = select(fdsrmax + 1, fdsr, NULL, NULL, 711 needdofsync ? &tv : tvp); 712 switch (i) { 713 case 0: 714 dofsync(); 715 needdofsync = 0; 716 if (tvp) { 717 tvp = NULL; 718 if (ppid != 1) 719 kill(ppid, SIGALRM); 720 } 721 continue; 722 case -1: 723 if (errno != EINTR) 724 logerror("select"); 725 continue; 726 } 727 STAILQ_FOREACH(sl, &shead, next) { 728 if (FD_ISSET(sl->sl_socket, fdsr)) 729 (*sl->sl_recv)(sl); 730 } 731 } 732 free(fdsr); 733 } 734 735 static int 736 socklist_recv_signal(struct socklist *sl __unused) 737 { 738 ssize_t len; 739 int i, nsig, signo; 740 741 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 742 logerror("ioctl(FIONREAD)"); 743 err(1, "signal pipe read failed"); 744 } 745 nsig = i / sizeof(signo); 746 dprintf("# of received signals = %d\n", nsig); 747 for (i = 0; i < nsig; i++) { 748 len = read(sigpipe[0], &signo, sizeof(signo)); 749 if (len != sizeof(signo)) { 750 logerror("signal pipe read failed"); 751 err(1, "signal pipe read failed"); 752 } 753 dprintf("Received signal: %d from fd=%d\n", signo, 754 sigpipe[0]); 755 switch (signo) { 756 case SIGHUP: 757 WantInitialize = 1; 758 break; 759 case SIGCHLD: 760 WantReapchild = 1; 761 break; 762 } 763 } 764 return (0); 765 } 766 767 static int 768 socklist_recv_sock(struct socklist *sl) 769 { 770 struct sockaddr_storage ss; 771 struct sockaddr *sa = (struct sockaddr *)&ss; 772 socklen_t sslen; 773 const char *hname; 774 char line[MAXLINE + 1]; 775 int date, len; 776 777 sslen = sizeof(ss); 778 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 779 dprintf("received sa_len = %d\n", sslen); 780 if (len == 0) 781 return (-1); 782 if (len < 0) { 783 if (errno != EINTR) 784 logerror("recvfrom"); 785 return (-1); 786 } 787 /* Received valid data. */ 788 line[len] = '\0'; 789 if (sl->sl_ss.ss_family == AF_LOCAL) { 790 hname = LocalHostName; 791 date = 0; 792 } else { 793 hname = cvthname(sa); 794 unmapped(sa); 795 if (validate(sa, hname) == 0) 796 hname = NULL; 797 date = RemoteAddDate ? ADDDATE : 0; 798 } 799 if (hname != NULL) 800 printline(hname, line, date); 801 else 802 dprintf("Invalid msg from %s was ignored.", hname); 803 804 return (0); 805 } 806 807 static void 808 unmapped(struct sockaddr *sa) 809 { 810 #if defined(INET) && defined(INET6) 811 struct sockaddr_in6 *sin6; 812 struct sockaddr_in sin; 813 814 if (sa == NULL || 815 sa->sa_family != AF_INET6 || 816 sa->sa_len != sizeof(*sin6)) 817 return; 818 sin6 = satosin6(sa); 819 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 820 return; 821 sin = (struct sockaddr_in){ 822 .sin_family = AF_INET, 823 .sin_len = sizeof(sin), 824 .sin_port = sin6->sin6_port 825 }; 826 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 827 sizeof(sin.sin_addr)); 828 memcpy(sa, &sin, sizeof(sin)); 829 #else 830 if (sa == NULL) 831 return; 832 #endif 833 } 834 835 static void 836 usage(void) 837 { 838 839 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 840 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 841 " [-b bind_address] [-f config_file]", 842 " [-l [mode:]path] [-m mark_interval]", 843 " [-P pid_file] [-p log_socket]", 844 " [-S logpriv_socket]"); 845 exit(1); 846 } 847 848 /* 849 * Take a raw input line, decode the message, and print the message 850 * on the appropriate log files. 851 */ 852 static void 853 printline(const char *hname, char *msg, int flags) 854 { 855 char *p, *q; 856 long n; 857 int c, pri; 858 char line[MAXLINE + 1]; 859 860 /* test for special codes */ 861 p = msg; 862 pri = DEFUPRI; 863 if (*p == '<') { 864 errno = 0; 865 n = strtol(p + 1, &q, 10); 866 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 867 p = q + 1; 868 pri = n; 869 } 870 } 871 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 872 pri = DEFUPRI; 873 874 /* 875 * Don't allow users to log kernel messages. 876 * NOTE: since LOG_KERN == 0 this will also match 877 * messages with no facility specified. 878 */ 879 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 880 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 881 882 q = line; 883 884 while ((c = (unsigned char)*p++) != '\0' && 885 q < &line[sizeof(line) - 4]) { 886 if (mask_C1 && (c & 0x80) && c < 0xA0) { 887 c &= 0x7F; 888 *q++ = 'M'; 889 *q++ = '-'; 890 } 891 if (isascii(c) && iscntrl(c)) { 892 if (c == '\n') { 893 *q++ = ' '; 894 } else if (c == '\t') { 895 *q++ = '\t'; 896 } else { 897 *q++ = '^'; 898 *q++ = c ^ 0100; 899 } 900 } else { 901 *q++ = c; 902 } 903 } 904 *q = '\0'; 905 906 logmsg(pri, line, hname, flags); 907 } 908 909 /* 910 * Read /dev/klog while data are available, split into lines. 911 */ 912 static int 913 socklist_recv_file(struct socklist *sl) 914 { 915 char *p, *q, line[MAXLINE + 1]; 916 int len, i; 917 918 len = 0; 919 for (;;) { 920 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 921 if (i > 0) { 922 line[i + len] = '\0'; 923 } else { 924 if (i < 0 && errno != EINTR && errno != EAGAIN) { 925 logerror("klog"); 926 close(sl->sl_socket); 927 sl->sl_socket = -1; 928 } 929 break; 930 } 931 932 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 933 *q = '\0'; 934 printsys(p); 935 } 936 len = strlen(p); 937 if (len >= MAXLINE - 1) { 938 printsys(p); 939 len = 0; 940 } 941 if (len > 0) 942 memmove(line, p, len + 1); 943 } 944 if (len > 0) 945 printsys(line); 946 947 return (len); 948 } 949 950 /* 951 * Take a raw input line from /dev/klog, format similar to syslog(). 952 */ 953 static void 954 printsys(char *msg) 955 { 956 char *p, *q; 957 long n; 958 int flags, isprintf, pri; 959 960 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 961 p = msg; 962 pri = DEFSPRI; 963 isprintf = 1; 964 if (*p == '<') { 965 errno = 0; 966 n = strtol(p + 1, &q, 10); 967 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 968 p = q + 1; 969 pri = n; 970 isprintf = 0; 971 } 972 } 973 /* 974 * Kernel printf's and LOG_CONSOLE messages have been displayed 975 * on the console already. 976 */ 977 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 978 flags |= IGN_CONS; 979 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 980 pri = DEFSPRI; 981 logmsg(pri, p, LocalHostName, flags); 982 } 983 984 static time_t now; 985 986 /* 987 * Match a program or host name against a specification. 988 * Return a non-0 value if the message must be ignored 989 * based on the specification. 990 */ 991 static int 992 skip_message(const char *name, const char *spec, int checkcase) 993 { 994 const char *s; 995 char prev, next; 996 int exclude = 0; 997 /* Behaviour on explicit match */ 998 999 if (spec == NULL) 1000 return 0; 1001 switch (*spec) { 1002 case '-': 1003 exclude = 1; 1004 /*FALLTHROUGH*/ 1005 case '+': 1006 spec++; 1007 break; 1008 default: 1009 break; 1010 } 1011 if (checkcase) 1012 s = strstr (spec, name); 1013 else 1014 s = strcasestr (spec, name); 1015 1016 if (s != NULL) { 1017 prev = (s == spec ? ',' : *(s - 1)); 1018 next = *(s + strlen (name)); 1019 1020 if (prev == ',' && (next == '\0' || next == ',')) 1021 /* Explicit match: skip iff the spec is an 1022 exclusive one. */ 1023 return exclude; 1024 } 1025 1026 /* No explicit match for this name: skip the message iff 1027 the spec is an inclusive one. */ 1028 return !exclude; 1029 } 1030 1031 /* 1032 * Log a message to the appropriate log files, users, etc. based on 1033 * the priority. 1034 */ 1035 static void 1036 logmsg(int pri, const char *msg, const char *from, int flags) 1037 { 1038 struct filed *f; 1039 int i, j, fac, msglen, prilev; 1040 const char *timestamp; 1041 char prog[NAME_MAX+1]; 1042 char buf[MAXLINE+1]; 1043 1044 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1045 pri, flags, from, msg); 1046 1047 /* 1048 * Check to see if msg looks non-standard. 1049 */ 1050 msglen = strlen(msg); 1051 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 1052 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 1053 flags |= ADDDATE; 1054 1055 (void)time(&now); 1056 if (flags & ADDDATE) { 1057 timestamp = ctime(&now) + 4; 1058 } else { 1059 timestamp = msg; 1060 msg += MAXDATELEN; 1061 msglen -= MAXDATELEN; 1062 } 1063 1064 /* skip leading blanks */ 1065 while (isspace(*msg)) { 1066 msg++; 1067 msglen--; 1068 } 1069 1070 /* extract facility and priority level */ 1071 if (flags & MARK) 1072 fac = LOG_NFACILITIES; 1073 else 1074 fac = LOG_FAC(pri); 1075 1076 /* Check maximum facility number. */ 1077 if (fac > LOG_NFACILITIES) 1078 return; 1079 1080 prilev = LOG_PRI(pri); 1081 1082 /* skip hostname, see RFC 3164 */ 1083 for (i = 0, j = 0; i < NAME_MAX; i++) { 1084 if (isspace(msg[i])) { 1085 j = i + 1; 1086 } 1087 if (msg[i] == ':') 1088 break; 1089 } 1090 if (j <= msglen) { 1091 msg += j; 1092 msglen -= j; 1093 } 1094 1095 /* extract program name */ 1096 for (i = 0; i < NAME_MAX; i++) { 1097 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1098 msg[i] == '/' || isspace(msg[i])) 1099 break; 1100 prog[i] = msg[i]; 1101 } 1102 prog[i] = 0; 1103 1104 /* add kernel prefix for kernel messages */ 1105 if (flags & ISKERNEL) { 1106 snprintf(buf, sizeof(buf), "%s: %s", 1107 use_bootfile ? bootfile : "kernel", msg); 1108 msg = buf; 1109 msglen = strlen(buf); 1110 } 1111 1112 /* log the message to the particular outputs */ 1113 if (!Initialized) { 1114 f = &consfile; 1115 /* 1116 * Open in non-blocking mode to avoid hangs during open 1117 * and close(waiting for the port to drain). 1118 */ 1119 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1120 1121 if (f->f_file >= 0) { 1122 (void)strlcpy(f->f_lasttime, timestamp, 1123 sizeof(f->f_lasttime)); 1124 fprintlog(f, flags, msg); 1125 close(f->f_file); 1126 f->f_file = -1; 1127 } 1128 return; 1129 } 1130 STAILQ_FOREACH(f, &fhead, next) { 1131 /* skip messages that are incorrect priority */ 1132 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1133 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1134 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1135 ) 1136 || f->f_pmask[fac] == INTERNAL_NOPRI) 1137 continue; 1138 1139 /* skip messages with the incorrect hostname */ 1140 if (skip_message(from, f->f_host, 0)) 1141 continue; 1142 1143 /* skip messages with the incorrect program name */ 1144 if (skip_message(prog, f->f_program, 1)) 1145 continue; 1146 1147 /* skip message to console if it has already been printed */ 1148 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1149 continue; 1150 1151 /* don't output marks to recently written files */ 1152 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1153 continue; 1154 1155 /* 1156 * suppress duplicate lines to this file 1157 */ 1158 if (no_compress - (f->f_type != F_PIPE) < 1 && 1159 (flags & MARK) == 0 && msglen == f->f_prevlen && 1160 !strcmp(msg, f->f_prevline) && 1161 !strcasecmp(from, f->f_prevhost)) { 1162 (void)strlcpy(f->f_lasttime, timestamp, 1163 sizeof(f->f_lasttime)); 1164 f->f_prevcount++; 1165 dprintf("msg repeated %d times, %ld sec of %d\n", 1166 f->f_prevcount, (long)(now - f->f_time), 1167 repeatinterval[f->f_repeatcount]); 1168 /* 1169 * If domark would have logged this by now, 1170 * flush it now (so we don't hold isolated messages), 1171 * but back off so we'll flush less often 1172 * in the future. 1173 */ 1174 if (now > REPEATTIME(f)) { 1175 fprintlog(f, flags, (char *)NULL); 1176 BACKOFF(f); 1177 } 1178 } else { 1179 /* new line, save it */ 1180 if (f->f_prevcount) 1181 fprintlog(f, 0, (char *)NULL); 1182 f->f_repeatcount = 0; 1183 f->f_prevpri = pri; 1184 (void)strlcpy(f->f_lasttime, timestamp, 1185 sizeof(f->f_lasttime)); 1186 (void)strlcpy(f->f_prevhost, from, 1187 sizeof(f->f_prevhost)); 1188 if (msglen < MAXSVLINE) { 1189 f->f_prevlen = msglen; 1190 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1191 fprintlog(f, flags, (char *)NULL); 1192 } else { 1193 f->f_prevline[0] = 0; 1194 f->f_prevlen = 0; 1195 fprintlog(f, flags, msg); 1196 } 1197 } 1198 } 1199 } 1200 1201 static void 1202 dofsync(void) 1203 { 1204 struct filed *f; 1205 1206 STAILQ_FOREACH(f, &fhead, next) { 1207 if ((f->f_type == F_FILE) && 1208 (f->f_flags & FFLAG_NEEDSYNC)) { 1209 f->f_flags &= ~FFLAG_NEEDSYNC; 1210 (void)fsync(f->f_file); 1211 } 1212 } 1213 } 1214 1215 #define IOV_SIZE 7 1216 static void 1217 fprintlog(struct filed *f, int flags, const char *msg) 1218 { 1219 struct iovec iov[IOV_SIZE]; 1220 struct addrinfo *r; 1221 int l, lsent = 0; 1222 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1223 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1224 const char *msgret; 1225 1226 if (f->f_type == F_WALL) { 1227 /* The time displayed is not synchornized with the other log 1228 * destinations (like messages). Following fragment was using 1229 * ctime(&now), which was updating the time every 30 sec. 1230 * With f_lasttime, time is synchronized correctly. 1231 */ 1232 iov[0] = (struct iovec){ 1233 .iov_base = greetings, 1234 .iov_len = snprintf(greetings, sizeof(greetings), 1235 "\r\n\7Message from syslogd@%s " 1236 "at %.24s ...\r\n", 1237 f->f_prevhost, f->f_lasttime) 1238 }; 1239 if (iov[0].iov_len >= sizeof(greetings)) 1240 iov[0].iov_len = sizeof(greetings) - 1; 1241 iov[1] = (struct iovec){ 1242 .iov_base = nul, 1243 .iov_len = 0 1244 }; 1245 } else { 1246 iov[0] = (struct iovec){ 1247 .iov_base = f->f_lasttime, 1248 .iov_len = strlen(f->f_lasttime) 1249 }; 1250 iov[1] = (struct iovec){ 1251 .iov_base = space, 1252 .iov_len = 1 1253 }; 1254 } 1255 1256 if (LogFacPri) { 1257 static char fp_buf[30]; /* Hollow laugh */ 1258 int fac = f->f_prevpri & LOG_FACMASK; 1259 int pri = LOG_PRI(f->f_prevpri); 1260 const char *f_s = NULL; 1261 char f_n[5]; /* Hollow laugh */ 1262 const char *p_s = NULL; 1263 char p_n[5]; /* Hollow laugh */ 1264 1265 if (LogFacPri > 1) { 1266 const CODE *c; 1267 1268 for (c = facilitynames; c->c_name; c++) { 1269 if (c->c_val == fac) { 1270 f_s = c->c_name; 1271 break; 1272 } 1273 } 1274 for (c = prioritynames; c->c_name; c++) { 1275 if (c->c_val == pri) { 1276 p_s = c->c_name; 1277 break; 1278 } 1279 } 1280 } 1281 if (!f_s) { 1282 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1283 f_s = f_n; 1284 } 1285 if (!p_s) { 1286 snprintf(p_n, sizeof p_n, "%d", pri); 1287 p_s = p_n; 1288 } 1289 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1290 iov[2] = (struct iovec){ 1291 .iov_base = fp_buf, 1292 .iov_len = strlen(fp_buf) 1293 }; 1294 } else { 1295 iov[2] = (struct iovec){ 1296 .iov_base = nul, 1297 .iov_len = 0 1298 }; 1299 } 1300 iov[3] = (struct iovec){ 1301 .iov_base = f->f_prevhost, 1302 .iov_len = strlen(f->f_prevhost) 1303 }; 1304 iov[4] = (struct iovec){ 1305 .iov_base = space, 1306 .iov_len = 1 1307 }; 1308 if (msg) { 1309 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1310 if (wmsg == NULL) { 1311 logerror("strdup"); 1312 exit(1); 1313 } 1314 iov[5] = (struct iovec){ 1315 .iov_base = wmsg, 1316 .iov_len = strlen(msg) 1317 }; 1318 } else if (f->f_prevcount > 1) { 1319 iov[5] = (struct iovec){ 1320 .iov_base = repbuf, 1321 .iov_len = snprintf(repbuf, sizeof(repbuf), 1322 "last message repeated %d times", f->f_prevcount) 1323 }; 1324 } else { 1325 iov[5] = (struct iovec){ 1326 .iov_base = f->f_prevline, 1327 .iov_len = f->f_prevlen 1328 }; 1329 } 1330 dprintf("Logging to %s", TypeNames[f->f_type]); 1331 f->f_time = now; 1332 1333 switch (f->f_type) { 1334 case F_UNUSED: 1335 dprintf("\n"); 1336 break; 1337 1338 case F_FORW: 1339 dprintf(" %s", f->fu_forw_hname); 1340 switch (f->fu_forw_addr->ai_addr->sa_family) { 1341 #ifdef INET 1342 case AF_INET: 1343 dprintf(":%d\n", 1344 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1345 break; 1346 #endif 1347 #ifdef INET6 1348 case AF_INET6: 1349 dprintf(":%d\n", 1350 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1351 break; 1352 #endif 1353 default: 1354 dprintf("\n"); 1355 } 1356 /* check for local vs remote messages */ 1357 if (strcasecmp(f->f_prevhost, LocalHostName)) 1358 l = snprintf(line, sizeof line - 1, 1359 "<%d>%.15s Forwarded from %s: %s", 1360 f->f_prevpri, (char *)iov[0].iov_base, 1361 f->f_prevhost, (char *)iov[5].iov_base); 1362 else 1363 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1364 f->f_prevpri, (char *)iov[0].iov_base, 1365 (char *)iov[5].iov_base); 1366 if (l < 0) 1367 l = 0; 1368 else if (l > MAXLINE) 1369 l = MAXLINE; 1370 1371 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1372 struct socklist *sl; 1373 1374 STAILQ_FOREACH(sl, &shead, next) { 1375 if (sl->sl_ss.ss_family == AF_LOCAL || 1376 sl->sl_ss.ss_family == AF_UNSPEC || 1377 sl->sl_socket < 0) 1378 continue; 1379 lsent = sendto(sl->sl_socket, line, l, 0, 1380 r->ai_addr, r->ai_addrlen); 1381 if (lsent == l) 1382 break; 1383 } 1384 if (lsent == l && !send_to_all) 1385 break; 1386 } 1387 dprintf("lsent/l: %d/%d\n", lsent, l); 1388 if (lsent != l) { 1389 int e = errno; 1390 logerror("sendto"); 1391 errno = e; 1392 switch (errno) { 1393 case ENOBUFS: 1394 case ENETDOWN: 1395 case ENETUNREACH: 1396 case EHOSTUNREACH: 1397 case EHOSTDOWN: 1398 case EADDRNOTAVAIL: 1399 break; 1400 /* case EBADF: */ 1401 /* case EACCES: */ 1402 /* case ENOTSOCK: */ 1403 /* case EFAULT: */ 1404 /* case EMSGSIZE: */ 1405 /* case EAGAIN: */ 1406 /* case ENOBUFS: */ 1407 /* case ECONNREFUSED: */ 1408 default: 1409 dprintf("removing entry: errno=%d\n", e); 1410 f->f_type = F_UNUSED; 1411 break; 1412 } 1413 } 1414 break; 1415 1416 case F_FILE: 1417 dprintf(" %s\n", f->fu_fname); 1418 iov[6] = (struct iovec){ 1419 .iov_base = lf, 1420 .iov_len = 1 1421 }; 1422 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1423 /* 1424 * If writev(2) fails for potentially transient errors 1425 * like the filesystem being full, ignore it. 1426 * Otherwise remove this logfile from the list. 1427 */ 1428 if (errno != ENOSPC) { 1429 int e = errno; 1430 close_filed(f); 1431 errno = e; 1432 logerror(f->fu_fname); 1433 } 1434 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1435 f->f_flags |= FFLAG_NEEDSYNC; 1436 needdofsync = 1; 1437 } 1438 break; 1439 1440 case F_PIPE: 1441 dprintf(" %s\n", f->fu_pipe_pname); 1442 iov[6] = (struct iovec){ 1443 .iov_base = lf, 1444 .iov_len = 1 1445 }; 1446 if (f->fu_pipe_pid == 0) { 1447 if ((f->f_file = p_open(f->fu_pipe_pname, 1448 &f->fu_pipe_pid)) < 0) { 1449 logerror(f->fu_pipe_pname); 1450 break; 1451 } 1452 } 1453 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1454 int e = errno; 1455 1456 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1457 close_filed(f); 1458 errno = e; 1459 logerror(f->fu_pipe_pname); 1460 } 1461 break; 1462 1463 case F_CONSOLE: 1464 if (flags & IGN_CONS) { 1465 dprintf(" (ignored)\n"); 1466 break; 1467 } 1468 /* FALLTHROUGH */ 1469 1470 case F_TTY: 1471 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1472 iov[6] = (struct iovec){ 1473 .iov_base = crlf, 1474 .iov_len = 2 1475 }; 1476 errno = 0; /* ttymsg() only sometimes returns an errno */ 1477 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1478 f->f_type = F_UNUSED; 1479 logerror(msgret); 1480 } 1481 break; 1482 1483 case F_USERS: 1484 case F_WALL: 1485 dprintf("\n"); 1486 iov[6] = (struct iovec){ 1487 .iov_base = crlf, 1488 .iov_len = 2 1489 }; 1490 wallmsg(f, iov, nitems(iov)); 1491 break; 1492 } 1493 f->f_prevcount = 0; 1494 free(wmsg); 1495 } 1496 1497 /* 1498 * WALLMSG -- Write a message to the world at large 1499 * 1500 * Write the specified message to either the entire 1501 * world, or a list of approved users. 1502 */ 1503 static void 1504 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1505 { 1506 static int reenter; /* avoid calling ourselves */ 1507 struct utmpx *ut; 1508 int i; 1509 const char *p; 1510 1511 if (reenter++) 1512 return; 1513 setutxent(); 1514 /* NOSTRICT */ 1515 while ((ut = getutxent()) != NULL) { 1516 if (ut->ut_type != USER_PROCESS) 1517 continue; 1518 if (f->f_type == F_WALL) { 1519 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1520 TTYMSGTIME)) != NULL) { 1521 errno = 0; /* already in msg */ 1522 logerror(p); 1523 } 1524 continue; 1525 } 1526 /* should we send the message to this user? */ 1527 for (i = 0; i < MAXUNAMES; i++) { 1528 if (!f->fu_uname[i][0]) 1529 break; 1530 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1531 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1532 TTYMSGTIME)) != NULL) { 1533 errno = 0; /* already in msg */ 1534 logerror(p); 1535 } 1536 break; 1537 } 1538 } 1539 } 1540 endutxent(); 1541 reenter = 0; 1542 } 1543 1544 /* 1545 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1546 */ 1547 static const char * 1548 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1549 { 1550 static char device[1024]; 1551 static char errbuf[1024]; 1552 struct stat sb; 1553 1554 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1555 1556 if (stat(device, &sb) < 0) { 1557 (void) snprintf(errbuf, sizeof(errbuf), 1558 "%s: %s", device, strerror(errno)); 1559 return (errbuf); 1560 } 1561 if ((sb.st_mode & S_IWGRP) == 0) 1562 /* Messages disabled. */ 1563 return (NULL); 1564 return ttymsg(iov, iovcnt, line, tmout); 1565 } 1566 1567 static void 1568 reapchild(int signo __unused) 1569 { 1570 int status; 1571 pid_t pid; 1572 struct filed *f; 1573 1574 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1575 /* First, look if it's a process from the dead queue. */ 1576 if (deadq_removebypid(pid)) 1577 continue; 1578 1579 /* Now, look in list of active processes. */ 1580 STAILQ_FOREACH(f, &fhead, next) { 1581 if (f->f_type == F_PIPE && 1582 f->fu_pipe_pid == pid) { 1583 close_filed(f); 1584 log_deadchild(pid, status, f->fu_pipe_pname); 1585 break; 1586 } 1587 } 1588 } 1589 WantReapchild = 0; 1590 } 1591 1592 /* 1593 * Return a printable representation of a host address. 1594 */ 1595 static const char * 1596 cvthname(struct sockaddr *f) 1597 { 1598 int error, hl; 1599 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1600 1601 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1602 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1603 NI_NUMERICHOST); 1604 if (error) { 1605 dprintf("Malformed from address %s\n", gai_strerror(error)); 1606 return ("???"); 1607 } 1608 dprintf("cvthname(%s)\n", ip); 1609 1610 if (!resolve) 1611 return (ip); 1612 1613 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1614 NULL, 0, NI_NAMEREQD); 1615 if (error) { 1616 dprintf("Host name for your address (%s) unknown\n", ip); 1617 return (ip); 1618 } 1619 hl = strlen(hname); 1620 if (hl > 0 && hname[hl-1] == '.') 1621 hname[--hl] = '\0'; 1622 trimdomain(hname, hl); 1623 return (hname); 1624 } 1625 1626 static void 1627 dodie(int signo) 1628 { 1629 1630 WantDie = signo; 1631 } 1632 1633 static void 1634 domark(int signo __unused) 1635 { 1636 1637 MarkSet = 1; 1638 } 1639 1640 /* 1641 * Print syslogd errors some place. 1642 */ 1643 static void 1644 logerror(const char *type) 1645 { 1646 char buf[512]; 1647 static int recursed = 0; 1648 1649 /* If there's an error while trying to log an error, give up. */ 1650 if (recursed) 1651 return; 1652 recursed++; 1653 if (errno) 1654 (void)snprintf(buf, 1655 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1656 else 1657 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1658 errno = 0; 1659 dprintf("%s\n", buf); 1660 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1661 recursed--; 1662 } 1663 1664 static void 1665 die(int signo) 1666 { 1667 struct filed *f; 1668 struct socklist *sl; 1669 char buf[100]; 1670 1671 STAILQ_FOREACH(f, &fhead, next) { 1672 /* flush any pending output */ 1673 if (f->f_prevcount) 1674 fprintlog(f, 0, (char *)NULL); 1675 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 1676 close_filed(f); 1677 } 1678 if (signo) { 1679 dprintf("syslogd: exiting on signal %d\n", signo); 1680 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1681 errno = 0; 1682 logerror(buf); 1683 } 1684 STAILQ_FOREACH(sl, &shead, next) { 1685 if (sl->sl_ss.ss_family == AF_LOCAL) 1686 unlink(sl->sl_peer->pe_name); 1687 } 1688 pidfile_remove(pfh); 1689 1690 exit(1); 1691 } 1692 1693 static int 1694 configfiles(const struct dirent *dp) 1695 { 1696 const char *p; 1697 size_t ext_len; 1698 1699 if (dp->d_name[0] == '.') 1700 return (0); 1701 1702 ext_len = sizeof(include_ext) -1; 1703 1704 if (dp->d_namlen <= ext_len) 1705 return (0); 1706 1707 p = &dp->d_name[dp->d_namlen - ext_len]; 1708 if (strcmp(p, include_ext) != 0) 1709 return (0); 1710 1711 return (1); 1712 } 1713 1714 static void 1715 readconfigfile(FILE *cf, int allow_includes) 1716 { 1717 FILE *cf2; 1718 struct filed *f; 1719 struct dirent **ent; 1720 char cline[LINE_MAX]; 1721 char host[MAXHOSTNAMELEN]; 1722 char prog[LINE_MAX]; 1723 char file[MAXPATHLEN]; 1724 char *p, *tmp; 1725 int i, nents; 1726 size_t include_len; 1727 1728 /* 1729 * Foreach line in the conf table, open that file. 1730 */ 1731 include_len = sizeof(include_str) -1; 1732 (void)strlcpy(host, "*", sizeof(host)); 1733 (void)strlcpy(prog, "*", sizeof(prog)); 1734 while (fgets(cline, sizeof(cline), cf) != NULL) { 1735 /* 1736 * check for end-of-section, comments, strip off trailing 1737 * spaces and newline character. #!prog is treated specially: 1738 * following lines apply only to that program. 1739 */ 1740 for (p = cline; isspace(*p); ++p) 1741 continue; 1742 if (*p == 0) 1743 continue; 1744 if (allow_includes && 1745 strncmp(p, include_str, include_len) == 0 && 1746 isspace(p[include_len])) { 1747 p += include_len; 1748 while (isspace(*p)) 1749 p++; 1750 tmp = p; 1751 while (*tmp != '\0' && !isspace(*tmp)) 1752 tmp++; 1753 *tmp = '\0'; 1754 dprintf("Trying to include files in '%s'\n", p); 1755 nents = scandir(p, &ent, configfiles, alphasort); 1756 if (nents == -1) { 1757 dprintf("Unable to open '%s': %s\n", p, 1758 strerror(errno)); 1759 continue; 1760 } 1761 for (i = 0; i < nents; i++) { 1762 if (snprintf(file, sizeof(file), "%s/%s", p, 1763 ent[i]->d_name) >= (int)sizeof(file)) { 1764 dprintf("ignoring path too long: " 1765 "'%s/%s'\n", p, ent[i]->d_name); 1766 free(ent[i]); 1767 continue; 1768 } 1769 free(ent[i]); 1770 cf2 = fopen(file, "r"); 1771 if (cf2 == NULL) 1772 continue; 1773 dprintf("reading %s\n", file); 1774 readconfigfile(cf2, 0); 1775 fclose(cf2); 1776 } 1777 free(ent); 1778 continue; 1779 } 1780 if (*p == '#') { 1781 p++; 1782 if (*p != '!' && *p != '+' && *p != '-') 1783 continue; 1784 } 1785 if (*p == '+' || *p == '-') { 1786 host[0] = *p++; 1787 while (isspace(*p)) 1788 p++; 1789 if ((!*p) || (*p == '*')) { 1790 (void)strlcpy(host, "*", sizeof(host)); 1791 continue; 1792 } 1793 if (*p == '@') 1794 p = LocalHostName; 1795 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1796 if (!isalnum(*p) && *p != '.' && *p != '-' 1797 && *p != ',' && *p != ':' && *p != '%') 1798 break; 1799 host[i] = *p++; 1800 } 1801 host[i] = '\0'; 1802 continue; 1803 } 1804 if (*p == '!') { 1805 p++; 1806 while (isspace(*p)) p++; 1807 if ((!*p) || (*p == '*')) { 1808 (void)strlcpy(prog, "*", sizeof(prog)); 1809 continue; 1810 } 1811 for (i = 0; i < LINE_MAX - 1; i++) { 1812 if (!isprint(p[i]) || isspace(p[i])) 1813 break; 1814 prog[i] = p[i]; 1815 } 1816 prog[i] = 0; 1817 continue; 1818 } 1819 for (p = cline + 1; *p != '\0'; p++) { 1820 if (*p != '#') 1821 continue; 1822 if (*(p - 1) == '\\') { 1823 strcpy(p - 1, p); 1824 p--; 1825 continue; 1826 } 1827 *p = '\0'; 1828 break; 1829 } 1830 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1831 cline[i] = '\0'; 1832 f = cfline(cline, prog, host); 1833 if (f != NULL) 1834 addfile(f); 1835 } 1836 } 1837 1838 static void 1839 sighandler(int signo) 1840 { 1841 1842 /* Send an wake-up signal to the select() loop. */ 1843 write(sigpipe[1], &signo, sizeof(signo)); 1844 } 1845 1846 /* 1847 * INIT -- Initialize syslogd from configuration table 1848 */ 1849 static void 1850 init(int signo) 1851 { 1852 int i; 1853 FILE *cf; 1854 struct filed *f; 1855 char *p; 1856 char oldLocalHostName[MAXHOSTNAMELEN]; 1857 char hostMsg[2*MAXHOSTNAMELEN+40]; 1858 char bootfileMsg[LINE_MAX]; 1859 1860 dprintf("init\n"); 1861 WantInitialize = 0; 1862 1863 /* 1864 * Load hostname (may have changed). 1865 */ 1866 if (signo != 0) 1867 (void)strlcpy(oldLocalHostName, LocalHostName, 1868 sizeof(oldLocalHostName)); 1869 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1870 err(EX_OSERR, "gethostname() failed"); 1871 if ((p = strchr(LocalHostName, '.')) != NULL) { 1872 *p++ = '\0'; 1873 LocalDomain = p; 1874 } else { 1875 LocalDomain = ""; 1876 } 1877 1878 /* 1879 * Load / reload timezone data (in case it changed). 1880 * 1881 * Just calling tzset() again does not work, the timezone code 1882 * caches the result. However, by setting the TZ variable, one 1883 * can defeat the caching and have the timezone code really 1884 * reload the timezone data. Respect any initial setting of 1885 * TZ, in case the system is configured specially. 1886 */ 1887 dprintf("loading timezone data via tzset()\n"); 1888 if (getenv("TZ")) { 1889 tzset(); 1890 } else { 1891 setenv("TZ", ":/etc/localtime", 1); 1892 tzset(); 1893 unsetenv("TZ"); 1894 } 1895 1896 /* 1897 * Close all open log files. 1898 */ 1899 Initialized = 0; 1900 STAILQ_FOREACH(f, &fhead, next) { 1901 /* flush any pending output */ 1902 if (f->f_prevcount) 1903 fprintlog(f, 0, (char *)NULL); 1904 1905 switch (f->f_type) { 1906 case F_FILE: 1907 case F_FORW: 1908 case F_CONSOLE: 1909 case F_TTY: 1910 close_filed(f); 1911 break; 1912 case F_PIPE: 1913 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1914 close_filed(f); 1915 break; 1916 } 1917 } 1918 while(!STAILQ_EMPTY(&fhead)) { 1919 f = STAILQ_FIRST(&fhead); 1920 STAILQ_REMOVE_HEAD(&fhead, next); 1921 free(f->f_program); 1922 free(f->f_host); 1923 free(f); 1924 } 1925 1926 /* open the configuration file */ 1927 if ((cf = fopen(ConfFile, "r")) == NULL) { 1928 dprintf("cannot open %s\n", ConfFile); 1929 f = cfline("*.ERR\t/dev/console", "*", "*"); 1930 if (f != NULL) 1931 addfile(f); 1932 f = cfline("*.PANIC\t*", "*", "*"); 1933 if (f != NULL) 1934 addfile(f); 1935 Initialized = 1; 1936 1937 return; 1938 } 1939 1940 readconfigfile(cf, 1); 1941 1942 /* close the configuration file */ 1943 (void)fclose(cf); 1944 1945 Initialized = 1; 1946 1947 if (Debug) { 1948 int port; 1949 STAILQ_FOREACH(f, &fhead, next) { 1950 for (i = 0; i <= LOG_NFACILITIES; i++) 1951 if (f->f_pmask[i] == INTERNAL_NOPRI) 1952 printf("X "); 1953 else 1954 printf("%d ", f->f_pmask[i]); 1955 printf("%s: ", TypeNames[f->f_type]); 1956 switch (f->f_type) { 1957 case F_FILE: 1958 printf("%s", f->fu_fname); 1959 break; 1960 1961 case F_CONSOLE: 1962 case F_TTY: 1963 printf("%s%s", _PATH_DEV, f->fu_fname); 1964 break; 1965 1966 case F_FORW: 1967 switch (f->fu_forw_addr->ai_addr->sa_family) { 1968 #ifdef INET 1969 case AF_INET: 1970 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1971 break; 1972 #endif 1973 #ifdef INET6 1974 case AF_INET6: 1975 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 1976 break; 1977 #endif 1978 default: 1979 port = 0; 1980 } 1981 if (port != 514) { 1982 printf("%s:%d", 1983 f->fu_forw_hname, port); 1984 } else { 1985 printf("%s", f->fu_forw_hname); 1986 } 1987 break; 1988 1989 case F_PIPE: 1990 printf("%s", f->fu_pipe_pname); 1991 break; 1992 1993 case F_USERS: 1994 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1995 printf("%s, ", f->fu_uname[i]); 1996 break; 1997 } 1998 if (f->f_program) 1999 printf(" (%s)", f->f_program); 2000 printf("\n"); 2001 } 2002 } 2003 2004 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 2005 dprintf("syslogd: restarted\n"); 2006 /* 2007 * Log a change in hostname, but only on a restart. 2008 */ 2009 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2010 (void)snprintf(hostMsg, sizeof(hostMsg), 2011 "syslogd: hostname changed, \"%s\" to \"%s\"", 2012 oldLocalHostName, LocalHostName); 2013 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 2014 dprintf("%s\n", hostMsg); 2015 } 2016 /* 2017 * Log the kernel boot file if we aren't going to use it as 2018 * the prefix, and if this is *not* a restart. 2019 */ 2020 if (signo == 0 && !use_bootfile) { 2021 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2022 "syslogd: kernel boot file is %s", bootfile); 2023 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 2024 dprintf("%s\n", bootfileMsg); 2025 } 2026 } 2027 2028 /* 2029 * Crack a configuration file line 2030 */ 2031 static struct filed * 2032 cfline(const char *line, const char *prog, const char *host) 2033 { 2034 struct filed *f; 2035 struct addrinfo hints, *res; 2036 int error, i, pri, syncfile; 2037 const char *p, *q; 2038 char *bp; 2039 char buf[MAXLINE], ebuf[100]; 2040 2041 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 2042 2043 f = calloc(1, sizeof(*f)); 2044 if (f == NULL) { 2045 logerror("malloc"); 2046 exit(1); 2047 } 2048 errno = 0; /* keep strerror() stuff out of logerror messages */ 2049 2050 for (i = 0; i <= LOG_NFACILITIES; i++) 2051 f->f_pmask[i] = INTERNAL_NOPRI; 2052 2053 /* save hostname if any */ 2054 if (host && *host == '*') 2055 host = NULL; 2056 if (host) { 2057 int hl; 2058 2059 f->f_host = strdup(host); 2060 if (f->f_host == NULL) { 2061 logerror("strdup"); 2062 exit(1); 2063 } 2064 hl = strlen(f->f_host); 2065 if (hl > 0 && f->f_host[hl-1] == '.') 2066 f->f_host[--hl] = '\0'; 2067 trimdomain(f->f_host, hl); 2068 } 2069 2070 /* save program name if any */ 2071 if (prog && *prog == '*') 2072 prog = NULL; 2073 if (prog) { 2074 f->f_program = strdup(prog); 2075 if (f->f_program == NULL) { 2076 logerror("strdup"); 2077 exit(1); 2078 } 2079 } 2080 2081 /* scan through the list of selectors */ 2082 for (p = line; *p && *p != '\t' && *p != ' ';) { 2083 int pri_done; 2084 int pri_cmp; 2085 int pri_invert; 2086 2087 /* find the end of this facility name list */ 2088 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2089 continue; 2090 2091 /* get the priority comparison */ 2092 pri_cmp = 0; 2093 pri_done = 0; 2094 pri_invert = 0; 2095 if (*q == '!') { 2096 pri_invert = 1; 2097 q++; 2098 } 2099 while (!pri_done) { 2100 switch (*q) { 2101 case '<': 2102 pri_cmp |= PRI_LT; 2103 q++; 2104 break; 2105 case '=': 2106 pri_cmp |= PRI_EQ; 2107 q++; 2108 break; 2109 case '>': 2110 pri_cmp |= PRI_GT; 2111 q++; 2112 break; 2113 default: 2114 pri_done++; 2115 break; 2116 } 2117 } 2118 2119 /* collect priority name */ 2120 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2121 *bp++ = *q++; 2122 *bp = '\0'; 2123 2124 /* skip cruft */ 2125 while (strchr(",;", *q)) 2126 q++; 2127 2128 /* decode priority name */ 2129 if (*buf == '*') { 2130 pri = LOG_PRIMASK; 2131 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2132 } else { 2133 /* Ignore trailing spaces. */ 2134 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2135 buf[i] = '\0'; 2136 2137 pri = decode(buf, prioritynames); 2138 if (pri < 0) { 2139 errno = 0; 2140 (void)snprintf(ebuf, sizeof ebuf, 2141 "unknown priority name \"%s\"", buf); 2142 logerror(ebuf); 2143 free(f); 2144 return (NULL); 2145 } 2146 } 2147 if (!pri_cmp) 2148 pri_cmp = (UniquePriority) 2149 ? (PRI_EQ) 2150 : (PRI_EQ | PRI_GT) 2151 ; 2152 if (pri_invert) 2153 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2154 2155 /* scan facilities */ 2156 while (*p && !strchr("\t.; ", *p)) { 2157 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2158 *bp++ = *p++; 2159 *bp = '\0'; 2160 2161 if (*buf == '*') { 2162 for (i = 0; i < LOG_NFACILITIES; i++) { 2163 f->f_pmask[i] = pri; 2164 f->f_pcmp[i] = pri_cmp; 2165 } 2166 } else { 2167 i = decode(buf, facilitynames); 2168 if (i < 0) { 2169 errno = 0; 2170 (void)snprintf(ebuf, sizeof ebuf, 2171 "unknown facility name \"%s\"", 2172 buf); 2173 logerror(ebuf); 2174 free(f); 2175 return (NULL); 2176 } 2177 f->f_pmask[i >> 3] = pri; 2178 f->f_pcmp[i >> 3] = pri_cmp; 2179 } 2180 while (*p == ',' || *p == ' ') 2181 p++; 2182 } 2183 2184 p = q; 2185 } 2186 2187 /* skip to action part */ 2188 while (*p == '\t' || *p == ' ') 2189 p++; 2190 2191 if (*p == '-') { 2192 syncfile = 0; 2193 p++; 2194 } else 2195 syncfile = 1; 2196 2197 switch (*p) { 2198 case '@': 2199 { 2200 char *tp; 2201 char endkey = ':'; 2202 /* 2203 * scan forward to see if there is a port defined. 2204 * so we can't use strlcpy.. 2205 */ 2206 i = sizeof(f->fu_forw_hname); 2207 tp = f->fu_forw_hname; 2208 p++; 2209 2210 /* 2211 * an ipv6 address should start with a '[' in that case 2212 * we should scan for a ']' 2213 */ 2214 if (*p == '[') { 2215 p++; 2216 endkey = ']'; 2217 } 2218 while (*p && (*p != endkey) && (i-- > 0)) { 2219 *tp++ = *p++; 2220 } 2221 if (endkey == ']' && *p == endkey) 2222 p++; 2223 *tp = '\0'; 2224 } 2225 /* See if we copied a domain and have a port */ 2226 if (*p == ':') 2227 p++; 2228 else 2229 p = NULL; 2230 2231 hints = (struct addrinfo){ 2232 .ai_family = family, 2233 .ai_socktype = SOCK_DGRAM 2234 }; 2235 error = getaddrinfo(f->fu_forw_hname, 2236 p ? p : "syslog", &hints, &res); 2237 if (error) { 2238 logerror(gai_strerror(error)); 2239 break; 2240 } 2241 f->fu_forw_addr = res; 2242 f->f_type = F_FORW; 2243 break; 2244 2245 case '/': 2246 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2247 f->f_type = F_UNUSED; 2248 logerror(p); 2249 break; 2250 } 2251 if (syncfile) 2252 f->f_flags |= FFLAG_SYNC; 2253 if (isatty(f->f_file)) { 2254 if (strcmp(p, ctty) == 0) 2255 f->f_type = F_CONSOLE; 2256 else 2257 f->f_type = F_TTY; 2258 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2259 sizeof(f->fu_fname)); 2260 } else { 2261 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2262 f->f_type = F_FILE; 2263 } 2264 break; 2265 2266 case '|': 2267 f->fu_pipe_pid = 0; 2268 (void)strlcpy(f->fu_pipe_pname, p + 1, 2269 sizeof(f->fu_pipe_pname)); 2270 f->f_type = F_PIPE; 2271 break; 2272 2273 case '*': 2274 f->f_type = F_WALL; 2275 break; 2276 2277 default: 2278 for (i = 0; i < MAXUNAMES && *p; i++) { 2279 for (q = p; *q && *q != ','; ) 2280 q++; 2281 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2282 if ((q - p) >= MAXLOGNAME) 2283 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2284 else 2285 f->fu_uname[i][q - p] = '\0'; 2286 while (*q == ',' || *q == ' ') 2287 q++; 2288 p = q; 2289 } 2290 f->f_type = F_USERS; 2291 break; 2292 } 2293 return (f); 2294 } 2295 2296 2297 /* 2298 * Decode a symbolic name to a numeric value 2299 */ 2300 static int 2301 decode(const char *name, const CODE *codetab) 2302 { 2303 const CODE *c; 2304 char *p, buf[40]; 2305 2306 if (isdigit(*name)) 2307 return (atoi(name)); 2308 2309 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2310 if (isupper(*name)) 2311 *p = tolower(*name); 2312 else 2313 *p = *name; 2314 } 2315 *p = '\0'; 2316 for (c = codetab; c->c_name; c++) 2317 if (!strcmp(buf, c->c_name)) 2318 return (c->c_val); 2319 2320 return (-1); 2321 } 2322 2323 static void 2324 markit(void) 2325 { 2326 struct filed *f; 2327 struct deadq_entry *dq, *dq0; 2328 2329 now = time((time_t *)NULL); 2330 MarkSeq += TIMERINTVL; 2331 if (MarkSeq >= MarkInterval) { 2332 logmsg(LOG_INFO, "-- MARK --", 2333 LocalHostName, ADDDATE|MARK); 2334 MarkSeq = 0; 2335 } 2336 2337 STAILQ_FOREACH(f, &fhead, next) { 2338 if (f->f_prevcount && now >= REPEATTIME(f)) { 2339 dprintf("flush %s: repeated %d times, %d sec.\n", 2340 TypeNames[f->f_type], f->f_prevcount, 2341 repeatinterval[f->f_repeatcount]); 2342 fprintlog(f, 0, (char *)NULL); 2343 BACKOFF(f); 2344 } 2345 } 2346 2347 /* Walk the dead queue, and see if we should signal somebody. */ 2348 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2349 switch (dq->dq_timeout) { 2350 case 0: 2351 /* Already signalled once, try harder now. */ 2352 if (kill(dq->dq_pid, SIGKILL) != 0) 2353 (void)deadq_remove(dq); 2354 break; 2355 2356 case 1: 2357 /* 2358 * Timed out on dead queue, send terminate 2359 * signal. Note that we leave the removal 2360 * from the dead queue to reapchild(), which 2361 * will also log the event (unless the process 2362 * didn't even really exist, in case we simply 2363 * drop it from the dead queue). 2364 */ 2365 if (kill(dq->dq_pid, SIGTERM) != 0) 2366 (void)deadq_remove(dq); 2367 else 2368 dq->dq_timeout--; 2369 break; 2370 default: 2371 dq->dq_timeout--; 2372 } 2373 } 2374 MarkSet = 0; 2375 (void)alarm(TIMERINTVL); 2376 } 2377 2378 /* 2379 * fork off and become a daemon, but wait for the child to come online 2380 * before returning to the parent, or we get disk thrashing at boot etc. 2381 * Set a timer so we don't hang forever if it wedges. 2382 */ 2383 static int 2384 waitdaemon(int maxwait) 2385 { 2386 int fd; 2387 int status; 2388 pid_t pid, childpid; 2389 2390 switch (childpid = fork()) { 2391 case -1: 2392 return (-1); 2393 case 0: 2394 break; 2395 default: 2396 signal(SIGALRM, timedout); 2397 alarm(maxwait); 2398 while ((pid = wait3(&status, 0, NULL)) != -1) { 2399 if (WIFEXITED(status)) 2400 errx(1, "child pid %d exited with return code %d", 2401 pid, WEXITSTATUS(status)); 2402 if (WIFSIGNALED(status)) 2403 errx(1, "child pid %d exited on signal %d%s", 2404 pid, WTERMSIG(status), 2405 WCOREDUMP(status) ? " (core dumped)" : 2406 ""); 2407 if (pid == childpid) /* it's gone... */ 2408 break; 2409 } 2410 exit(0); 2411 } 2412 2413 if (setsid() == -1) 2414 return (-1); 2415 2416 (void)chdir("/"); 2417 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2418 (void)dup2(fd, STDIN_FILENO); 2419 (void)dup2(fd, STDOUT_FILENO); 2420 (void)dup2(fd, STDERR_FILENO); 2421 if (fd > STDERR_FILENO) 2422 (void)close(fd); 2423 } 2424 return (getppid()); 2425 } 2426 2427 /* 2428 * We get a SIGALRM from the child when it's running and finished doing it's 2429 * fsync()'s or O_SYNC writes for all the boot messages. 2430 * 2431 * We also get a signal from the kernel if the timer expires, so check to 2432 * see what happened. 2433 */ 2434 static void 2435 timedout(int sig __unused) 2436 { 2437 int left; 2438 left = alarm(0); 2439 signal(SIGALRM, SIG_DFL); 2440 if (left == 0) 2441 errx(1, "timed out waiting for child"); 2442 else 2443 _exit(0); 2444 } 2445 2446 /* 2447 * Add `s' to the list of allowable peer addresses to accept messages 2448 * from. 2449 * 2450 * `s' is a string in the form: 2451 * 2452 * [*]domainname[:{servicename|portnumber|*}] 2453 * 2454 * or 2455 * 2456 * netaddr/maskbits[:{servicename|portnumber|*}] 2457 * 2458 * Returns -1 on error, 0 if the argument was valid. 2459 */ 2460 static int 2461 allowaddr(char *s) 2462 { 2463 #if defined(INET) || defined(INET6) 2464 char *cp1, *cp2; 2465 struct allowedpeer *ap; 2466 struct servent *se; 2467 int masklen = -1; 2468 struct addrinfo hints, *res = NULL; 2469 #ifdef INET 2470 in_addr_t *addrp, *maskp; 2471 #endif 2472 #ifdef INET6 2473 uint32_t *addr6p, *mask6p; 2474 #endif 2475 char ip[NI_MAXHOST]; 2476 2477 ap = calloc(1, sizeof(*ap)); 2478 if (ap == NULL) 2479 err(1, "malloc failed"); 2480 2481 #ifdef INET6 2482 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2483 #endif 2484 cp1 = s; 2485 if ((cp1 = strrchr(cp1, ':'))) { 2486 /* service/port provided */ 2487 *cp1++ = '\0'; 2488 if (strlen(cp1) == 1 && *cp1 == '*') 2489 /* any port allowed */ 2490 ap->port = 0; 2491 else if ((se = getservbyname(cp1, "udp"))) { 2492 ap->port = ntohs(se->s_port); 2493 } else { 2494 ap->port = strtol(cp1, &cp2, 0); 2495 /* port not numeric */ 2496 if (*cp2 != '\0') 2497 goto err; 2498 } 2499 } else { 2500 if ((se = getservbyname("syslog", "udp"))) 2501 ap->port = ntohs(se->s_port); 2502 else 2503 /* sanity, should not happen */ 2504 ap->port = 514; 2505 } 2506 2507 if ((cp1 = strchr(s, '/')) != NULL && 2508 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2509 *cp1 = '\0'; 2510 if ((masklen = atoi(cp1 + 1)) < 0) 2511 goto err; 2512 } 2513 #ifdef INET6 2514 if (*s == '[') { 2515 cp2 = s + strlen(s) - 1; 2516 if (*cp2 == ']') { 2517 ++s; 2518 *cp2 = '\0'; 2519 } else { 2520 cp2 = NULL; 2521 } 2522 } else { 2523 cp2 = NULL; 2524 } 2525 #endif 2526 hints = (struct addrinfo){ 2527 .ai_family = PF_UNSPEC, 2528 .ai_socktype = SOCK_DGRAM, 2529 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2530 }; 2531 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2532 ap->isnumeric = 1; 2533 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2534 ap->a_mask = (struct sockaddr_storage){ 2535 .ss_family = res->ai_family, 2536 .ss_len = res->ai_addrlen 2537 }; 2538 switch (res->ai_family) { 2539 #ifdef INET 2540 case AF_INET: 2541 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2542 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2543 if (masklen < 0) { 2544 /* use default netmask */ 2545 if (IN_CLASSA(ntohl(*addrp))) 2546 *maskp = htonl(IN_CLASSA_NET); 2547 else if (IN_CLASSB(ntohl(*addrp))) 2548 *maskp = htonl(IN_CLASSB_NET); 2549 else 2550 *maskp = htonl(IN_CLASSC_NET); 2551 } else if (masklen == 0) { 2552 *maskp = 0; 2553 } else if (masklen <= 32) { 2554 /* convert masklen to netmask */ 2555 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2556 } else { 2557 goto err; 2558 } 2559 /* Lose any host bits in the network number. */ 2560 *addrp &= *maskp; 2561 break; 2562 #endif 2563 #ifdef INET6 2564 case AF_INET6: 2565 if (masklen > 128) 2566 goto err; 2567 2568 if (masklen < 0) 2569 masklen = 128; 2570 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2571 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2572 /* convert masklen to netmask */ 2573 while (masklen > 0) { 2574 if (masklen < 32) { 2575 *mask6p = 2576 htonl(~(0xffffffff >> masklen)); 2577 *addr6p &= *mask6p; 2578 break; 2579 } else { 2580 *mask6p++ = 0xffffffff; 2581 addr6p++; 2582 masklen -= 32; 2583 } 2584 } 2585 break; 2586 #endif 2587 default: 2588 goto err; 2589 } 2590 freeaddrinfo(res); 2591 } else { 2592 /* arg `s' is domain name */ 2593 ap->isnumeric = 0; 2594 ap->a_name = s; 2595 if (cp1) 2596 *cp1 = '/'; 2597 #ifdef INET6 2598 if (cp2) { 2599 *cp2 = ']'; 2600 --s; 2601 } 2602 #endif 2603 } 2604 STAILQ_INSERT_TAIL(&aphead, ap, next); 2605 2606 if (Debug) { 2607 printf("allowaddr: rule "); 2608 if (ap->isnumeric) { 2609 printf("numeric, "); 2610 getnameinfo(sstosa(&ap->a_addr), 2611 (sstosa(&ap->a_addr))->sa_len, 2612 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2613 printf("addr = %s, ", ip); 2614 getnameinfo(sstosa(&ap->a_mask), 2615 (sstosa(&ap->a_mask))->sa_len, 2616 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2617 printf("mask = %s; ", ip); 2618 } else { 2619 printf("domainname = %s; ", ap->a_name); 2620 } 2621 printf("port = %d\n", ap->port); 2622 } 2623 #endif 2624 2625 return (0); 2626 err: 2627 if (res != NULL) 2628 freeaddrinfo(res); 2629 free(ap); 2630 return (-1); 2631 } 2632 2633 /* 2634 * Validate that the remote peer has permission to log to us. 2635 */ 2636 static int 2637 validate(struct sockaddr *sa, const char *hname) 2638 { 2639 int i; 2640 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2641 struct allowedpeer *ap; 2642 #ifdef INET 2643 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2644 #endif 2645 #ifdef INET6 2646 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2647 #endif 2648 struct addrinfo hints, *res; 2649 u_short sport; 2650 int num = 0; 2651 2652 STAILQ_FOREACH(ap, &aphead, next) { 2653 num++; 2654 } 2655 dprintf("# of validation rule: %d\n", num); 2656 if (num == 0) 2657 /* traditional behaviour, allow everything */ 2658 return (1); 2659 2660 (void)strlcpy(name, hname, sizeof(name)); 2661 hints = (struct addrinfo){ 2662 .ai_family = PF_UNSPEC, 2663 .ai_socktype = SOCK_DGRAM, 2664 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2665 }; 2666 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2667 freeaddrinfo(res); 2668 else if (strchr(name, '.') == NULL) { 2669 strlcat(name, ".", sizeof name); 2670 strlcat(name, LocalDomain, sizeof name); 2671 } 2672 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2673 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2674 return (0); /* for safety, should not occur */ 2675 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2676 ip, port, name); 2677 sport = atoi(port); 2678 2679 /* now, walk down the list */ 2680 i = 0; 2681 STAILQ_FOREACH(ap, &aphead, next) { 2682 i++; 2683 if (ap->port != 0 && ap->port != sport) { 2684 dprintf("rejected in rule %d due to port mismatch.\n", 2685 i); 2686 continue; 2687 } 2688 2689 if (ap->isnumeric) { 2690 if (ap->a_addr.ss_family != sa->sa_family) { 2691 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2692 continue; 2693 } 2694 #ifdef INET 2695 else if (ap->a_addr.ss_family == AF_INET) { 2696 sin4 = satosin(sa); 2697 a4p = satosin(&ap->a_addr); 2698 m4p = satosin(&ap->a_mask); 2699 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2700 != a4p->sin_addr.s_addr) { 2701 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2702 continue; 2703 } 2704 } 2705 #endif 2706 #ifdef INET6 2707 else if (ap->a_addr.ss_family == AF_INET6) { 2708 sin6 = satosin6(sa); 2709 a6p = satosin6(&ap->a_addr); 2710 m6p = satosin6(&ap->a_mask); 2711 if (a6p->sin6_scope_id != 0 && 2712 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2713 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2714 continue; 2715 } 2716 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2717 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2718 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2719 continue; 2720 } 2721 } 2722 #endif 2723 else 2724 continue; 2725 } else { 2726 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2727 FNM_NOMATCH) { 2728 dprintf("rejected in rule %d due to name " 2729 "mismatch.\n", i); 2730 continue; 2731 } 2732 } 2733 dprintf("accepted in rule %d.\n", i); 2734 return (1); /* hooray! */ 2735 } 2736 return (0); 2737 } 2738 2739 /* 2740 * Fairly similar to popen(3), but returns an open descriptor, as 2741 * opposed to a FILE *. 2742 */ 2743 static int 2744 p_open(const char *prog, pid_t *rpid) 2745 { 2746 int pfd[2], nulldesc; 2747 pid_t pid; 2748 char *argv[4]; /* sh -c cmd NULL */ 2749 char errmsg[200]; 2750 2751 if (pipe(pfd) == -1) 2752 return (-1); 2753 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2754 /* we are royally screwed anyway */ 2755 return (-1); 2756 2757 switch ((pid = fork())) { 2758 case -1: 2759 close(nulldesc); 2760 return (-1); 2761 2762 case 0: 2763 (void)setsid(); /* Avoid catching SIGHUPs. */ 2764 argv[0] = strdup("sh"); 2765 argv[1] = strdup("-c"); 2766 argv[2] = strdup(prog); 2767 argv[3] = NULL; 2768 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2769 logerror("strdup"); 2770 exit(1); 2771 } 2772 2773 alarm(0); 2774 2775 /* Restore signals marked as SIG_IGN. */ 2776 (void)signal(SIGINT, SIG_DFL); 2777 (void)signal(SIGQUIT, SIG_DFL); 2778 (void)signal(SIGPIPE, SIG_DFL); 2779 2780 dup2(pfd[0], STDIN_FILENO); 2781 dup2(nulldesc, STDOUT_FILENO); 2782 dup2(nulldesc, STDERR_FILENO); 2783 closefrom(STDERR_FILENO + 1); 2784 2785 (void)execvp(_PATH_BSHELL, argv); 2786 _exit(255); 2787 } 2788 close(nulldesc); 2789 close(pfd[0]); 2790 /* 2791 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2792 * supposed to get an EWOULDBLOCK on writev(2), which is 2793 * caught by the logic above anyway, which will in turn close 2794 * the pipe, and fork a new logging subprocess if necessary. 2795 * The stale subprocess will be killed some time later unless 2796 * it terminated itself due to closing its input pipe (so we 2797 * get rid of really dead puppies). 2798 */ 2799 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2800 /* This is bad. */ 2801 (void)snprintf(errmsg, sizeof errmsg, 2802 "Warning: cannot change pipe to PID %d to " 2803 "non-blocking behaviour.", 2804 (int)pid); 2805 logerror(errmsg); 2806 } 2807 *rpid = pid; 2808 return (pfd[1]); 2809 } 2810 2811 static void 2812 deadq_enter(pid_t pid, const char *name) 2813 { 2814 struct deadq_entry *dq; 2815 int status; 2816 2817 if (pid == 0) 2818 return; 2819 /* 2820 * Be paranoid, if we can't signal the process, don't enter it 2821 * into the dead queue (perhaps it's already dead). If possible, 2822 * we try to fetch and log the child's status. 2823 */ 2824 if (kill(pid, 0) != 0) { 2825 if (waitpid(pid, &status, WNOHANG) > 0) 2826 log_deadchild(pid, status, name); 2827 return; 2828 } 2829 2830 dq = malloc(sizeof(*dq)); 2831 if (dq == NULL) { 2832 logerror("malloc"); 2833 exit(1); 2834 } 2835 *dq = (struct deadq_entry){ 2836 .dq_pid = pid, 2837 .dq_timeout = DQ_TIMO_INIT 2838 }; 2839 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2840 } 2841 2842 static int 2843 deadq_remove(struct deadq_entry *dq) 2844 { 2845 if (dq != NULL) { 2846 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2847 free(dq); 2848 return (1); 2849 } 2850 2851 return (0); 2852 } 2853 2854 static int 2855 deadq_removebypid(pid_t pid) 2856 { 2857 struct deadq_entry *dq; 2858 2859 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2860 if (dq->dq_pid == pid) 2861 break; 2862 } 2863 return (deadq_remove(dq)); 2864 } 2865 2866 static void 2867 log_deadchild(pid_t pid, int status, const char *name) 2868 { 2869 int code; 2870 char buf[256]; 2871 const char *reason; 2872 2873 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2874 if (WIFSIGNALED(status)) { 2875 reason = "due to signal"; 2876 code = WTERMSIG(status); 2877 } else { 2878 reason = "with status"; 2879 code = WEXITSTATUS(status); 2880 if (code == 0) 2881 return; 2882 } 2883 (void)snprintf(buf, sizeof buf, 2884 "Logging subprocess %d (%s) exited %s %d.", 2885 pid, name, reason, code); 2886 logerror(buf); 2887 } 2888 2889 static int 2890 socksetup(struct peer *pe) 2891 { 2892 struct addrinfo hints, *res, *res0; 2893 int error; 2894 char *cp; 2895 int (*sl_recv)(struct socklist *); 2896 /* 2897 * We have to handle this case for backwards compatibility: 2898 * If there are two (or more) colons but no '[' and ']', 2899 * assume this is an inet6 address without a service. 2900 */ 2901 if (pe->pe_name != NULL) { 2902 #ifdef INET6 2903 if (pe->pe_name[0] == '[' && 2904 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2905 pe->pe_name = &pe->pe_name[1]; 2906 *cp = '\0'; 2907 if (cp[1] == ':' && cp[2] != '\0') 2908 pe->pe_serv = cp + 2; 2909 } else { 2910 #endif 2911 cp = strchr(pe->pe_name, ':'); 2912 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2913 *cp = '\0'; 2914 if (cp[1] != '\0') 2915 pe->pe_serv = cp + 1; 2916 if (cp == pe->pe_name) 2917 pe->pe_name = NULL; 2918 } 2919 #ifdef INET6 2920 } 2921 #endif 2922 } 2923 hints = (struct addrinfo){ 2924 .ai_family = AF_UNSPEC, 2925 .ai_socktype = SOCK_DGRAM, 2926 .ai_flags = AI_PASSIVE 2927 }; 2928 if (pe->pe_name != NULL) 2929 dprintf("Trying peer: %s\n", pe->pe_name); 2930 if (pe->pe_serv == NULL) 2931 pe->pe_serv = "syslog"; 2932 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2933 if (error) { 2934 char *msgbuf; 2935 2936 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 2937 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 2938 gai_strerror(error)); 2939 errno = 0; 2940 if (msgbuf == NULL) 2941 logerror(gai_strerror(error)); 2942 else 2943 logerror(msgbuf); 2944 free(msgbuf); 2945 die(0); 2946 } 2947 for (res = res0; res != NULL; res = res->ai_next) { 2948 int s; 2949 2950 if (res->ai_family != AF_LOCAL && 2951 SecureMode > 1) { 2952 /* Only AF_LOCAL in secure mode. */ 2953 continue; 2954 } 2955 if (family != AF_UNSPEC && 2956 res->ai_family != AF_LOCAL && res->ai_family != family) 2957 continue; 2958 2959 s = socket(res->ai_family, res->ai_socktype, 2960 res->ai_protocol); 2961 if (s < 0) { 2962 logerror("socket"); 2963 error++; 2964 continue; 2965 } 2966 #ifdef INET6 2967 if (res->ai_family == AF_INET6) { 2968 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2969 &(int){1}, sizeof(int)) < 0) { 2970 logerror("setsockopt(IPV6_V6ONLY)"); 2971 close(s); 2972 error++; 2973 continue; 2974 } 2975 } 2976 #endif 2977 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2978 &(int){1}, sizeof(int)) < 0) { 2979 logerror("setsockopt(SO_REUSEADDR)"); 2980 close(s); 2981 error++; 2982 continue; 2983 } 2984 2985 /* 2986 * Bind INET and UNIX-domain sockets. 2987 * 2988 * A UNIX-domain socket is always bound to a pathname 2989 * regardless of -N flag. 2990 * 2991 * For INET sockets, RFC 3164 recommends that client 2992 * side message should come from the privileged syslogd port. 2993 * 2994 * If the system administrator chooses not to obey 2995 * this, we can skip the bind() step so that the 2996 * system will choose a port for us. 2997 */ 2998 if (res->ai_family == AF_LOCAL) 2999 unlink(pe->pe_name); 3000 if (res->ai_family == AF_LOCAL || 3001 NoBind == 0 || pe->pe_name != NULL) { 3002 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3003 logerror("bind"); 3004 close(s); 3005 error++; 3006 continue; 3007 } 3008 if (res->ai_family == AF_LOCAL || 3009 SecureMode == 0) 3010 increase_rcvbuf(s); 3011 } 3012 if (res->ai_family == AF_LOCAL && 3013 chmod(pe->pe_name, pe->pe_mode) < 0) { 3014 dprintf("chmod %s: %s\n", pe->pe_name, 3015 strerror(errno)); 3016 close(s); 3017 error++; 3018 continue; 3019 } 3020 dprintf("new socket fd is %d\n", s); 3021 if (res->ai_socktype != SOCK_DGRAM) { 3022 listen(s, 5); 3023 } 3024 sl_recv = socklist_recv_sock; 3025 #if defined(INET) || defined(INET6) 3026 if (SecureMode && (res->ai_family == AF_INET || 3027 res->ai_family == AF_INET6)) { 3028 dprintf("shutdown\n"); 3029 /* Forbid communication in secure mode. */ 3030 if (shutdown(s, SHUT_RD) < 0 && 3031 errno != ENOTCONN) { 3032 logerror("shutdown"); 3033 if (!Debug) 3034 die(0); 3035 } 3036 sl_recv = NULL; 3037 } else 3038 #endif 3039 dprintf("listening on socket\n"); 3040 dprintf("sending on socket\n"); 3041 addsock(res->ai_addr, res->ai_addrlen, 3042 &(struct socklist){ 3043 .sl_socket = s, 3044 .sl_peer = pe, 3045 .sl_recv = sl_recv 3046 }); 3047 } 3048 freeaddrinfo(res0); 3049 3050 return(error); 3051 } 3052 3053 static void 3054 increase_rcvbuf(int fd) 3055 { 3056 socklen_t len; 3057 3058 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3059 &(socklen_t){sizeof(len)}) == 0) { 3060 if (len < RCVBUF_MINSIZE) { 3061 len = RCVBUF_MINSIZE; 3062 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3063 } 3064 } 3065 } 3066