1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. 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 /* Maximum number of characters in time of last occurrence */ 72 #define MAXDATELEN 16 73 #define MAXLINE 1024 /* maximum line length */ 74 #define MAXSVLINE MAXLINE /* maximum saved line length */ 75 #define DEFUPRI (LOG_USER|LOG_NOTICE) 76 #define DEFSPRI (LOG_KERN|LOG_CRIT) 77 #define TIMERINTVL 30 /* interval for checking flush, mark */ 78 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 79 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 80 81 #include <sys/param.h> 82 #include <sys/ioctl.h> 83 #include <sys/mman.h> 84 #include <sys/queue.h> 85 #include <sys/resource.h> 86 #include <sys/socket.h> 87 #include <sys/stat.h> 88 #include <sys/syslimits.h> 89 #include <sys/time.h> 90 #include <sys/uio.h> 91 #include <sys/un.h> 92 #include <sys/wait.h> 93 94 #if defined(INET) || defined(INET6) 95 #include <netinet/in.h> 96 #include <arpa/inet.h> 97 #endif 98 #include <netdb.h> 99 100 #include <ctype.h> 101 #include <dirent.h> 102 #include <err.h> 103 #include <errno.h> 104 #include <fcntl.h> 105 #include <fnmatch.h> 106 #include <libutil.h> 107 #include <limits.h> 108 #include <paths.h> 109 #include <signal.h> 110 #include <stdio.h> 111 #include <stdlib.h> 112 #include <string.h> 113 #include <sysexits.h> 114 #include <unistd.h> 115 #include <utmpx.h> 116 117 #include "pathnames.h" 118 #include "ttymsg.h" 119 120 #define SYSLOG_NAMES 121 #include <sys/syslog.h> 122 123 static const char *ConfFile = _PATH_LOGCONF; 124 static const char *PidFile = _PATH_LOGPID; 125 static const char ctty[] = _PATH_CONSOLE; 126 static const char include_str[] = "include"; 127 static const char include_ext[] = ".conf"; 128 129 #define dprintf if (Debug) printf 130 131 #define MAXUNAMES 20 /* maximum number of user names */ 132 133 #define sstosa(ss) ((struct sockaddr *)(ss)) 134 #ifdef INET 135 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 136 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 137 #endif 138 #ifdef INET6 139 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 140 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 141 #define s6_addr32 __u6_addr.__u6_addr32 142 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 143 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 144 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 145 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 146 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 147 #endif 148 /* 149 * List of peers and sockets for binding. 150 */ 151 struct peer { 152 const char *pe_name; 153 const char *pe_serv; 154 mode_t pe_mode; 155 STAILQ_ENTRY(peer) next; 156 }; 157 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 158 159 struct socklist { 160 struct sockaddr_storage sl_ss; 161 int sl_socket; 162 struct peer *sl_peer; 163 int (*sl_recv)(struct socklist *); 164 STAILQ_ENTRY(socklist) next; 165 }; 166 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 167 168 /* 169 * Flags to logmsg(). 170 */ 171 172 #define IGN_CONS 0x001 /* don't print on console */ 173 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 174 #define ADDDATE 0x004 /* add a date to the message */ 175 #define MARK 0x008 /* this message is a mark */ 176 #define ISKERNEL 0x010 /* kernel generated message */ 177 178 /* 179 * This structure represents the files that will have log 180 * copies printed. 181 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 182 * or if f_type if F_PIPE and f_pid > 0. 183 */ 184 185 struct filed { 186 STAILQ_ENTRY(filed) next; /* next in linked list */ 187 short f_type; /* entry type, see below */ 188 short f_file; /* file descriptor */ 189 time_t f_time; /* time this was last written */ 190 char *f_host; /* host from which to recd. */ 191 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 192 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 193 #define PRI_LT 0x1 194 #define PRI_EQ 0x2 195 #define PRI_GT 0x4 196 char *f_program; /* program this applies to */ 197 union { 198 char f_uname[MAXUNAMES][MAXLOGNAME]; 199 struct { 200 char f_hname[MAXHOSTNAMELEN]; 201 struct addrinfo *f_addr; 202 203 } f_forw; /* forwarding address */ 204 char f_fname[MAXPATHLEN]; 205 struct { 206 char f_pname[MAXPATHLEN]; 207 pid_t f_pid; 208 } f_pipe; 209 } f_un; 210 #define fu_uname f_un.f_uname 211 #define fu_forw_hname f_un.f_forw.f_hname 212 #define fu_forw_addr f_un.f_forw.f_addr 213 #define fu_fname f_un.f_fname 214 #define fu_pipe_pname f_un.f_pipe.f_pname 215 #define fu_pipe_pid f_un.f_pipe.f_pid 216 char f_prevline[MAXSVLINE]; /* last message logged */ 217 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 218 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 219 int f_prevpri; /* pri of f_prevline */ 220 int f_prevlen; /* length of f_prevline */ 221 int f_prevcount; /* repetition cnt of prevline */ 222 u_int f_repeatcount; /* number of "repeated" msgs */ 223 int f_flags; /* file-specific flags */ 224 #define FFLAG_SYNC 0x01 225 #define FFLAG_NEEDSYNC 0x02 226 }; 227 228 /* 229 * Queue of about-to-be dead processes we should watch out for. 230 */ 231 struct deadq_entry { 232 pid_t dq_pid; 233 int dq_timeout; 234 TAILQ_ENTRY(deadq_entry) dq_entries; 235 }; 236 static TAILQ_HEAD(, deadq_entry) deadq_head = 237 TAILQ_HEAD_INITIALIZER(deadq_head); 238 239 /* 240 * The timeout to apply to processes waiting on the dead queue. Unit 241 * of measure is `mark intervals', i.e. 20 minutes by default. 242 * Processes on the dead queue will be terminated after that time. 243 */ 244 245 #define DQ_TIMO_INIT 2 246 247 /* 248 * Struct to hold records of network addresses that are allowed to log 249 * to us. 250 */ 251 struct allowedpeer { 252 int isnumeric; 253 u_short port; 254 union { 255 struct { 256 struct sockaddr_storage addr; 257 struct sockaddr_storage mask; 258 } numeric; 259 char *name; 260 } u; 261 #define a_addr u.numeric.addr 262 #define a_mask u.numeric.mask 263 #define a_name u.name 264 STAILQ_ENTRY(allowedpeer) next; 265 }; 266 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 267 268 269 /* 270 * Intervals at which we flush out "message repeated" messages, 271 * in seconds after previous message is logged. After each flush, 272 * we move to the next interval until we reach the largest. 273 */ 274 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 275 #define MAXREPEAT (nitems(repeatinterval) - 1) 276 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 277 #define BACKOFF(f) do { \ 278 if (++(f)->f_repeatcount > MAXREPEAT) \ 279 (f)->f_repeatcount = MAXREPEAT; \ 280 } while (0) 281 282 /* values for f_type */ 283 #define F_UNUSED 0 /* unused entry */ 284 #define F_FILE 1 /* regular file */ 285 #define F_TTY 2 /* terminal */ 286 #define F_CONSOLE 3 /* console terminal */ 287 #define F_FORW 4 /* remote machine */ 288 #define F_USERS 5 /* list of users */ 289 #define F_WALL 6 /* everyone logged on */ 290 #define F_PIPE 7 /* pipe to program */ 291 292 static const char *TypeNames[] = { 293 "UNUSED", "FILE", "TTY", "CONSOLE", 294 "FORW", "USERS", "WALL", "PIPE" 295 }; 296 297 static STAILQ_HEAD(, filed) fhead = 298 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 299 static struct filed consfile; /* Console */ 300 301 static int Debug; /* debug flag */ 302 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 303 static int resolve = 1; /* resolve hostname */ 304 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 305 static const char *LocalDomain; /* our local domain name */ 306 static int Initialized; /* set when we have initialized ourselves */ 307 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 308 static int MarkSeq; /* mark sequence number */ 309 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 310 static int SecureMode; /* when true, receive only unix domain socks */ 311 #ifdef INET6 312 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 313 #else 314 static int family = PF_INET; /* protocol family (IPv4 only) */ 315 #endif 316 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 317 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 318 static int use_bootfile; /* log entire bootfile for every kern msg */ 319 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 320 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 321 322 static char bootfile[MAXLINE+1]; /* booted kernel file */ 323 324 static int RemoteAddDate; /* Always set the date on remote messages */ 325 326 static int UniquePriority; /* Only log specified priority? */ 327 static int LogFacPri; /* Put facility and priority in log message: */ 328 /* 0=no, 1=numeric, 2=names */ 329 static int KeepKernFac; /* Keep remotely logged kernel facility */ 330 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 331 static struct pidfh *pfh; 332 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 333 334 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 335 336 static int allowaddr(char *); 337 static int addfile(struct filed *); 338 static int addpeer(struct peer *); 339 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 340 static struct filed *cfline(const char *, const char *, const char *); 341 static const char *cvthname(struct sockaddr *); 342 static void deadq_enter(pid_t, const char *); 343 static int deadq_remove(struct deadq_entry *); 344 static int deadq_removebypid(pid_t); 345 static int decode(const char *, const CODE *); 346 static void die(int) __dead2; 347 static void dodie(int); 348 static void dofsync(void); 349 static void domark(int); 350 static void fprintlog(struct filed *, int, const char *); 351 static void init(int); 352 static void logerror(const char *); 353 static void logmsg(int, const char *, const char *, int); 354 static void log_deadchild(pid_t, int, const char *); 355 static void markit(void); 356 static int socksetup(struct peer *); 357 static int socklist_recv_file(struct socklist *); 358 static int socklist_recv_sock(struct socklist *); 359 static int socklist_recv_signal(struct socklist *); 360 static void sighandler(int); 361 static int skip_message(const char *, const char *, int); 362 static void printline(const char *, char *, int); 363 static void printsys(char *); 364 static int p_open(const char *, pid_t *); 365 static void reapchild(int); 366 static const char *ttymsg_check(struct iovec *, int, char *, int); 367 static void usage(void); 368 static int validate(struct sockaddr *, const char *); 369 static void unmapped(struct sockaddr *); 370 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 371 static int waitdaemon(int); 372 static void timedout(int); 373 static void increase_rcvbuf(int); 374 375 static void 376 close_filed(struct filed *f) 377 { 378 379 if (f == NULL || f->f_file == -1) 380 return; 381 382 switch (f->f_type) { 383 case F_FILE: 384 case F_TTY: 385 case F_CONSOLE: 386 case F_FORW: 387 f->f_type = F_UNUSED; 388 break; 389 case F_PIPE: 390 f->fu_pipe_pid = 0; 391 break; 392 } 393 (void)close(f->f_file); 394 f->f_file = -1; 395 } 396 397 static int 398 addfile(struct filed *f0) 399 { 400 struct filed *f; 401 402 f = calloc(1, sizeof(*f)); 403 if (f == NULL) 404 err(1, "malloc failed"); 405 *f = *f0; 406 STAILQ_INSERT_TAIL(&fhead, f, next); 407 408 return (0); 409 } 410 411 static int 412 addpeer(struct peer *pe0) 413 { 414 struct peer *pe; 415 416 pe = calloc(1, sizeof(*pe)); 417 if (pe == NULL) 418 err(1, "malloc failed"); 419 *pe = *pe0; 420 STAILQ_INSERT_TAIL(&pqueue, pe, next); 421 422 return (0); 423 } 424 425 static int 426 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 427 { 428 struct socklist *sl; 429 430 sl = calloc(1, sizeof(*sl)); 431 if (sl == NULL) 432 err(1, "malloc failed"); 433 *sl = *sl0; 434 if (sa != NULL && sa_len > 0) 435 memcpy(&sl->sl_ss, sa, sa_len); 436 STAILQ_INSERT_TAIL(&shead, sl, next); 437 438 return (0); 439 } 440 441 int 442 main(int argc, char *argv[]) 443 { 444 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 445 fd_set *fdsr = NULL; 446 struct timeval tv, *tvp; 447 struct peer *pe; 448 struct socklist *sl; 449 pid_t ppid = 1, spid; 450 char *p; 451 452 if (madvise(NULL, 0, MADV_PROTECT) != 0) 453 dprintf("madvise() failed: %s\n", strerror(errno)); 454 455 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 456 != -1) 457 switch (ch) { 458 #ifdef INET 459 case '4': 460 family = PF_INET; 461 break; 462 #endif 463 #ifdef INET6 464 case '6': 465 family = PF_INET6; 466 break; 467 #endif 468 case '8': 469 mask_C1 = 0; 470 break; 471 case 'A': 472 send_to_all++; 473 break; 474 case 'a': /* allow specific network addresses only */ 475 if (allowaddr(optarg) == -1) 476 usage(); 477 break; 478 case 'b': 479 bflag = 1; 480 p = strchr(optarg, ']'); 481 if (p != NULL) 482 p = strchr(p + 1, ':'); 483 else { 484 p = strchr(optarg, ':'); 485 if (p != NULL && strchr(p + 1, ':') != NULL) 486 p = NULL; /* backward compatibility */ 487 } 488 if (p == NULL) { 489 /* A hostname or filename only. */ 490 addpeer(&(struct peer){ 491 .pe_name = optarg, 492 .pe_serv = "syslog" 493 }); 494 } else { 495 /* The case of "name:service". */ 496 *p++ = '\0'; 497 addpeer(&(struct peer){ 498 .pe_serv = p, 499 .pe_name = (strlen(optarg) == 0) ? 500 NULL : optarg, 501 }); 502 } 503 break; 504 case 'c': 505 no_compress++; 506 break; 507 case 'C': 508 logflags |= O_CREAT; 509 break; 510 case 'd': /* debug */ 511 Debug++; 512 break; 513 case 'f': /* configuration file */ 514 ConfFile = optarg; 515 break; 516 case 'F': /* run in foreground instead of daemon */ 517 Foreground++; 518 break; 519 case 'k': /* keep remote kern fac */ 520 KeepKernFac = 1; 521 break; 522 case 'l': 523 case 'p': 524 case 'S': 525 { 526 long perml; 527 mode_t mode; 528 char *name, *ep; 529 530 if (ch == 'l') 531 mode = DEFFILEMODE; 532 else if (ch == 'p') { 533 mode = DEFFILEMODE; 534 pflag = 1; 535 } else if (ch == 'S') { 536 mode = S_IRUSR | S_IWUSR; 537 Sflag = 1; 538 } 539 if (optarg[0] == '/') 540 name = optarg; 541 else if ((name = strchr(optarg, ':')) != NULL) { 542 *name++ = '\0'; 543 if (name[0] != '/') 544 errx(1, "socket name must be absolute " 545 "path"); 546 if (isdigit(*optarg)) { 547 perml = strtol(optarg, &ep, 8); 548 if (*ep || perml < 0 || 549 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 550 errx(1, "invalid mode %s, exiting", 551 optarg); 552 mode = (mode_t )perml; 553 } else 554 errx(1, "invalid mode %s, exiting", 555 optarg); 556 } else 557 errx(1, "invalid filename %s, exiting", 558 optarg); 559 addpeer(&(struct peer){ 560 .pe_name = name, 561 .pe_mode = mode 562 }); 563 break; 564 } 565 case 'm': /* mark interval */ 566 MarkInterval = atoi(optarg) * 60; 567 break; 568 case 'N': 569 NoBind = 1; 570 SecureMode = 1; 571 break; 572 case 'n': 573 resolve = 0; 574 break; 575 case 'o': 576 use_bootfile = 1; 577 break; 578 case 'P': /* path for alt. PID */ 579 PidFile = optarg; 580 break; 581 case 's': /* no network mode */ 582 SecureMode++; 583 break; 584 case 'T': 585 RemoteAddDate = 1; 586 break; 587 case 'u': /* only log specified priority */ 588 UniquePriority++; 589 break; 590 case 'v': /* log facility and priority */ 591 LogFacPri++; 592 break; 593 default: 594 usage(); 595 } 596 if ((argc -= optind) != 0) 597 usage(); 598 599 /* Pipe to catch a signal during select(). */ 600 s = pipe2(sigpipe, O_CLOEXEC); 601 if (s < 0) { 602 err(1, "cannot open a pipe for signals"); 603 } else { 604 addsock(NULL, 0, &(struct socklist){ 605 .sl_socket = sigpipe[0], 606 .sl_recv = socklist_recv_signal 607 }); 608 } 609 610 /* Listen by default: /dev/klog. */ 611 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 612 if (s < 0) { 613 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 614 } else { 615 addsock(NULL, 0, &(struct socklist){ 616 .sl_socket = s, 617 .sl_recv = socklist_recv_file, 618 }); 619 } 620 /* Listen by default: *:514 if no -b flag. */ 621 if (bflag == 0) 622 addpeer(&(struct peer){ 623 .pe_serv = "syslog" 624 }); 625 /* Listen by default: /var/run/log if no -p flag. */ 626 if (pflag == 0) 627 addpeer(&(struct peer){ 628 .pe_name = _PATH_LOG, 629 .pe_mode = DEFFILEMODE, 630 }); 631 /* Listen by default: /var/run/logpriv if no -S flag. */ 632 if (Sflag == 0) 633 addpeer(&(struct peer){ 634 .pe_name = _PATH_LOG_PRIV, 635 .pe_mode = S_IRUSR | S_IWUSR, 636 }); 637 STAILQ_FOREACH(pe, &pqueue, next) 638 socksetup(pe); 639 640 pfh = pidfile_open(PidFile, 0600, &spid); 641 if (pfh == NULL) { 642 if (errno == EEXIST) 643 errx(1, "syslogd already running, pid: %d", spid); 644 warn("cannot open pid file"); 645 } 646 647 if ((!Foreground) && (!Debug)) { 648 ppid = waitdaemon(30); 649 if (ppid < 0) { 650 warn("could not become daemon"); 651 pidfile_remove(pfh); 652 exit(1); 653 } 654 } else if (Debug) 655 setlinebuf(stdout); 656 657 consfile.f_type = F_CONSOLE; 658 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 659 sizeof(consfile.fu_fname)); 660 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 661 (void)signal(SIGTERM, dodie); 662 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 663 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 664 (void)signal(SIGHUP, sighandler); 665 (void)signal(SIGCHLD, sighandler); 666 (void)signal(SIGALRM, domark); 667 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 668 (void)alarm(TIMERINTVL); 669 670 /* tuck my process id away */ 671 pidfile_write(pfh); 672 673 dprintf("off & running....\n"); 674 675 tvp = &tv; 676 tv.tv_sec = tv.tv_usec = 0; 677 678 STAILQ_FOREACH(sl, &shead, next) { 679 if (sl->sl_socket > fdsrmax) 680 fdsrmax = sl->sl_socket; 681 } 682 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 683 sizeof(fd_mask)); 684 if (fdsr == NULL) 685 errx(1, "calloc fd_set"); 686 687 for (;;) { 688 if (Initialized == 0) 689 init(0); 690 else if (WantInitialize) 691 init(WantInitialize); 692 if (WantReapchild) 693 reapchild(WantReapchild); 694 if (MarkSet) 695 markit(); 696 if (WantDie) { 697 free(fdsr); 698 die(WantDie); 699 } 700 701 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 702 sizeof(fd_mask)); 703 704 STAILQ_FOREACH(sl, &shead, next) { 705 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 706 FD_SET(sl->sl_socket, fdsr); 707 } 708 i = select(fdsrmax + 1, fdsr, NULL, NULL, 709 needdofsync ? &tv : tvp); 710 switch (i) { 711 case 0: 712 dofsync(); 713 needdofsync = 0; 714 if (tvp) { 715 tvp = NULL; 716 if (ppid != 1) 717 kill(ppid, SIGALRM); 718 } 719 continue; 720 case -1: 721 if (errno != EINTR) 722 logerror("select"); 723 continue; 724 } 725 STAILQ_FOREACH(sl, &shead, next) { 726 if (FD_ISSET(sl->sl_socket, fdsr)) 727 (*sl->sl_recv)(sl); 728 } 729 } 730 free(fdsr); 731 } 732 733 static int 734 socklist_recv_signal(struct socklist *sl __unused) 735 { 736 ssize_t len; 737 int i, nsig, signo; 738 739 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 740 logerror("ioctl(FIONREAD)"); 741 err(1, "signal pipe read failed"); 742 } 743 nsig = i / sizeof(signo); 744 dprintf("# of received signals = %d\n", nsig); 745 for (i = 0; i < nsig; i++) { 746 len = read(sigpipe[0], &signo, sizeof(signo)); 747 if (len != sizeof(signo)) { 748 logerror("signal pipe read failed"); 749 err(1, "signal pipe read failed"); 750 } 751 dprintf("Received signal: %d from fd=%d\n", signo, 752 sigpipe[0]); 753 switch (signo) { 754 case SIGHUP: 755 WantInitialize = 1; 756 break; 757 case SIGCHLD: 758 WantReapchild = 1; 759 break; 760 } 761 } 762 return (0); 763 } 764 765 static int 766 socklist_recv_sock(struct socklist *sl) 767 { 768 struct sockaddr_storage ss; 769 struct sockaddr *sa = (struct sockaddr *)&ss; 770 socklen_t sslen; 771 const char *hname; 772 char line[MAXLINE + 1]; 773 int date, len; 774 775 sslen = sizeof(ss); 776 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 777 dprintf("received sa_len = %d\n", sslen); 778 if (len == 0) 779 return (-1); 780 if (len < 0) { 781 if (errno != EINTR) 782 logerror("recvfrom"); 783 return (-1); 784 } 785 /* Received valid data. */ 786 line[len] = '\0'; 787 if (sl->sl_ss.ss_family == AF_LOCAL) { 788 hname = LocalHostName; 789 date = 0; 790 } else { 791 hname = cvthname(sa); 792 unmapped(sa); 793 if (validate(sa, hname) == 0) 794 hname = NULL; 795 date = RemoteAddDate ? ADDDATE : 0; 796 } 797 if (hname != NULL) 798 printline(hname, line, date); 799 else 800 dprintf("Invalid msg from %s was ignored.", hname); 801 802 return (0); 803 } 804 805 static void 806 unmapped(struct sockaddr *sa) 807 { 808 #if defined(INET) && defined(INET6) 809 struct sockaddr_in6 *sin6; 810 struct sockaddr_in sin; 811 812 if (sa == NULL || 813 sa->sa_family != AF_INET6 || 814 sa->sa_len != sizeof(*sin6)) 815 return; 816 sin6 = satosin6(sa); 817 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 818 return; 819 sin = (struct sockaddr_in){ 820 .sin_family = AF_INET, 821 .sin_len = sizeof(sin), 822 .sin_port = sin6->sin6_port 823 }; 824 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 825 sizeof(sin.sin_addr)); 826 memcpy(sa, &sin, sizeof(sin)); 827 #else 828 if (sa == NULL) 829 return; 830 #endif 831 } 832 833 static void 834 usage(void) 835 { 836 837 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 838 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 839 " [-b bind_address] [-f config_file]", 840 " [-l [mode:]path] [-m mark_interval]", 841 " [-P pid_file] [-p log_socket]", 842 " [-S logpriv_socket]"); 843 exit(1); 844 } 845 846 /* 847 * Take a raw input line, decode the message, and print the message 848 * on the appropriate log files. 849 */ 850 static void 851 printline(const char *hname, char *msg, int flags) 852 { 853 char *p, *q; 854 long n; 855 int c, pri; 856 char line[MAXLINE + 1]; 857 858 /* test for special codes */ 859 p = msg; 860 pri = DEFUPRI; 861 if (*p == '<') { 862 errno = 0; 863 n = strtol(p + 1, &q, 10); 864 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 865 p = q + 1; 866 pri = n; 867 } 868 } 869 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 870 pri = DEFUPRI; 871 872 /* 873 * Don't allow users to log kernel messages. 874 * NOTE: since LOG_KERN == 0 this will also match 875 * messages with no facility specified. 876 */ 877 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 878 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 879 880 q = line; 881 882 while ((c = (unsigned char)*p++) != '\0' && 883 q < &line[sizeof(line) - 4]) { 884 if (mask_C1 && (c & 0x80) && c < 0xA0) { 885 c &= 0x7F; 886 *q++ = 'M'; 887 *q++ = '-'; 888 } 889 if (isascii(c) && iscntrl(c)) { 890 if (c == '\n') { 891 *q++ = ' '; 892 } else if (c == '\t') { 893 *q++ = '\t'; 894 } else { 895 *q++ = '^'; 896 *q++ = c ^ 0100; 897 } 898 } else { 899 *q++ = c; 900 } 901 } 902 *q = '\0'; 903 904 logmsg(pri, line, hname, flags); 905 } 906 907 /* 908 * Read /dev/klog while data are available, split into lines. 909 */ 910 static int 911 socklist_recv_file(struct socklist *sl) 912 { 913 char *p, *q, line[MAXLINE + 1]; 914 int len, i; 915 916 len = 0; 917 for (;;) { 918 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 919 if (i > 0) { 920 line[i + len] = '\0'; 921 } else { 922 if (i < 0 && errno != EINTR && errno != EAGAIN) { 923 logerror("klog"); 924 close(sl->sl_socket); 925 sl->sl_socket = -1; 926 } 927 break; 928 } 929 930 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 931 *q = '\0'; 932 printsys(p); 933 } 934 len = strlen(p); 935 if (len >= MAXLINE - 1) { 936 printsys(p); 937 len = 0; 938 } 939 if (len > 0) 940 memmove(line, p, len + 1); 941 } 942 if (len > 0) 943 printsys(line); 944 945 return (len); 946 } 947 948 /* 949 * Take a raw input line from /dev/klog, format similar to syslog(). 950 */ 951 static void 952 printsys(char *msg) 953 { 954 char *p, *q; 955 long n; 956 int flags, isprintf, pri; 957 958 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 959 p = msg; 960 pri = DEFSPRI; 961 isprintf = 1; 962 if (*p == '<') { 963 errno = 0; 964 n = strtol(p + 1, &q, 10); 965 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 966 p = q + 1; 967 pri = n; 968 isprintf = 0; 969 } 970 } 971 /* 972 * Kernel printf's and LOG_CONSOLE messages have been displayed 973 * on the console already. 974 */ 975 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 976 flags |= IGN_CONS; 977 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 978 pri = DEFSPRI; 979 logmsg(pri, p, LocalHostName, flags); 980 } 981 982 static time_t now; 983 984 /* 985 * Match a program or host name against a specification. 986 * Return a non-0 value if the message must be ignored 987 * based on the specification. 988 */ 989 static int 990 skip_message(const char *name, const char *spec, int checkcase) 991 { 992 const char *s; 993 char prev, next; 994 int exclude = 0; 995 /* Behaviour on explicit match */ 996 997 if (spec == NULL) 998 return 0; 999 switch (*spec) { 1000 case '-': 1001 exclude = 1; 1002 /*FALLTHROUGH*/ 1003 case '+': 1004 spec++; 1005 break; 1006 default: 1007 break; 1008 } 1009 if (checkcase) 1010 s = strstr (spec, name); 1011 else 1012 s = strcasestr (spec, name); 1013 1014 if (s != NULL) { 1015 prev = (s == spec ? ',' : *(s - 1)); 1016 next = *(s + strlen (name)); 1017 1018 if (prev == ',' && (next == '\0' || next == ',')) 1019 /* Explicit match: skip iff the spec is an 1020 exclusive one. */ 1021 return exclude; 1022 } 1023 1024 /* No explicit match for this name: skip the message iff 1025 the spec is an inclusive one. */ 1026 return !exclude; 1027 } 1028 1029 /* 1030 * Log a message to the appropriate log files, users, etc. based on 1031 * the priority. 1032 */ 1033 static void 1034 logmsg(int pri, const char *msg, const char *from, int flags) 1035 { 1036 struct filed *f; 1037 int i, j, fac, msglen, prilev; 1038 const char *timestamp; 1039 char prog[NAME_MAX+1]; 1040 char buf[MAXLINE+1]; 1041 1042 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1043 pri, flags, from, msg); 1044 1045 /* 1046 * Check to see if msg looks non-standard. 1047 */ 1048 msglen = strlen(msg); 1049 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 1050 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 1051 flags |= ADDDATE; 1052 1053 (void)time(&now); 1054 if (flags & ADDDATE) { 1055 timestamp = ctime(&now) + 4; 1056 } else { 1057 timestamp = msg; 1058 msg += MAXDATELEN; 1059 msglen -= MAXDATELEN; 1060 } 1061 1062 /* skip leading blanks */ 1063 while (isspace(*msg)) { 1064 msg++; 1065 msglen--; 1066 } 1067 1068 /* extract facility and priority level */ 1069 if (flags & MARK) 1070 fac = LOG_NFACILITIES; 1071 else 1072 fac = LOG_FAC(pri); 1073 1074 /* Check maximum facility number. */ 1075 if (fac > LOG_NFACILITIES) 1076 return; 1077 1078 prilev = LOG_PRI(pri); 1079 1080 /* skip hostname, see RFC 3164 */ 1081 for (i = 0, j = 0; i < NAME_MAX; i++) { 1082 if (isspace(msg[i])) { 1083 j = i + 1; 1084 } 1085 if (msg[i] == ':') 1086 break; 1087 } 1088 if (j <= msglen) { 1089 msg += j; 1090 msglen -= j; 1091 } 1092 1093 /* extract program name */ 1094 for (i = 0; i < NAME_MAX; i++) { 1095 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1096 msg[i] == '/' || isspace(msg[i])) 1097 break; 1098 prog[i] = msg[i]; 1099 } 1100 prog[i] = 0; 1101 1102 /* add kernel prefix for kernel messages */ 1103 if (flags & ISKERNEL) { 1104 snprintf(buf, sizeof(buf), "%s: %s", 1105 use_bootfile ? bootfile : "kernel", msg); 1106 msg = buf; 1107 msglen = strlen(buf); 1108 } 1109 1110 /* log the message to the particular outputs */ 1111 if (!Initialized) { 1112 f = &consfile; 1113 /* 1114 * Open in non-blocking mode to avoid hangs during open 1115 * and close(waiting for the port to drain). 1116 */ 1117 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1118 1119 if (f->f_file >= 0) { 1120 (void)strlcpy(f->f_lasttime, timestamp, 1121 sizeof(f->f_lasttime)); 1122 fprintlog(f, flags, msg); 1123 close(f->f_file); 1124 f->f_file = -1; 1125 } 1126 return; 1127 } 1128 STAILQ_FOREACH(f, &fhead, next) { 1129 /* skip messages that are incorrect priority */ 1130 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1131 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1132 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1133 ) 1134 || f->f_pmask[fac] == INTERNAL_NOPRI) 1135 continue; 1136 1137 /* skip messages with the incorrect hostname */ 1138 if (skip_message(from, f->f_host, 0)) 1139 continue; 1140 1141 /* skip messages with the incorrect program name */ 1142 if (skip_message(prog, f->f_program, 1)) 1143 continue; 1144 1145 /* skip message to console if it has already been printed */ 1146 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1147 continue; 1148 1149 /* don't output marks to recently written files */ 1150 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1151 continue; 1152 1153 /* 1154 * suppress duplicate lines to this file 1155 */ 1156 if (no_compress - (f->f_type != F_PIPE) < 1 && 1157 (flags & MARK) == 0 && msglen == f->f_prevlen && 1158 !strcmp(msg, f->f_prevline) && 1159 !strcasecmp(from, f->f_prevhost)) { 1160 (void)strlcpy(f->f_lasttime, timestamp, 1161 sizeof(f->f_lasttime)); 1162 f->f_prevcount++; 1163 dprintf("msg repeated %d times, %ld sec of %d\n", 1164 f->f_prevcount, (long)(now - f->f_time), 1165 repeatinterval[f->f_repeatcount]); 1166 /* 1167 * If domark would have logged this by now, 1168 * flush it now (so we don't hold isolated messages), 1169 * but back off so we'll flush less often 1170 * in the future. 1171 */ 1172 if (now > REPEATTIME(f)) { 1173 fprintlog(f, flags, (char *)NULL); 1174 BACKOFF(f); 1175 } 1176 } else { 1177 /* new line, save it */ 1178 if (f->f_prevcount) 1179 fprintlog(f, 0, (char *)NULL); 1180 f->f_repeatcount = 0; 1181 f->f_prevpri = pri; 1182 (void)strlcpy(f->f_lasttime, timestamp, 1183 sizeof(f->f_lasttime)); 1184 (void)strlcpy(f->f_prevhost, from, 1185 sizeof(f->f_prevhost)); 1186 if (msglen < MAXSVLINE) { 1187 f->f_prevlen = msglen; 1188 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1189 fprintlog(f, flags, (char *)NULL); 1190 } else { 1191 f->f_prevline[0] = 0; 1192 f->f_prevlen = 0; 1193 fprintlog(f, flags, msg); 1194 } 1195 } 1196 } 1197 } 1198 1199 static void 1200 dofsync(void) 1201 { 1202 struct filed *f; 1203 1204 STAILQ_FOREACH(f, &fhead, next) { 1205 if ((f->f_type == F_FILE) && 1206 (f->f_flags & FFLAG_NEEDSYNC)) { 1207 f->f_flags &= ~FFLAG_NEEDSYNC; 1208 (void)fsync(f->f_file); 1209 } 1210 } 1211 } 1212 1213 #define IOV_SIZE 7 1214 static void 1215 fprintlog(struct filed *f, int flags, const char *msg) 1216 { 1217 struct iovec iov[IOV_SIZE]; 1218 struct addrinfo *r; 1219 int l, lsent = 0; 1220 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1221 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1222 const char *msgret; 1223 1224 if (f->f_type == F_WALL) { 1225 /* The time displayed is not synchornized with the other log 1226 * destinations (like messages). Following fragment was using 1227 * ctime(&now), which was updating the time every 30 sec. 1228 * With f_lasttime, time is synchronized correctly. 1229 */ 1230 iov[0] = (struct iovec){ 1231 .iov_base = greetings, 1232 .iov_len = snprintf(greetings, sizeof(greetings), 1233 "\r\n\7Message from syslogd@%s " 1234 "at %.24s ...\r\n", 1235 f->f_prevhost, f->f_lasttime) 1236 }; 1237 if (iov[0].iov_len >= sizeof(greetings)) 1238 iov[0].iov_len = sizeof(greetings) - 1; 1239 iov[1] = (struct iovec){ 1240 .iov_base = nul, 1241 .iov_len = 0 1242 }; 1243 } else { 1244 iov[0] = (struct iovec){ 1245 .iov_base = f->f_lasttime, 1246 .iov_len = strlen(f->f_lasttime) 1247 }; 1248 iov[1] = (struct iovec){ 1249 .iov_base = space, 1250 .iov_len = 1 1251 }; 1252 } 1253 1254 if (LogFacPri) { 1255 static char fp_buf[30]; /* Hollow laugh */ 1256 int fac = f->f_prevpri & LOG_FACMASK; 1257 int pri = LOG_PRI(f->f_prevpri); 1258 const char *f_s = NULL; 1259 char f_n[5]; /* Hollow laugh */ 1260 const char *p_s = NULL; 1261 char p_n[5]; /* Hollow laugh */ 1262 1263 if (LogFacPri > 1) { 1264 const CODE *c; 1265 1266 for (c = facilitynames; c->c_name; c++) { 1267 if (c->c_val == fac) { 1268 f_s = c->c_name; 1269 break; 1270 } 1271 } 1272 for (c = prioritynames; c->c_name; c++) { 1273 if (c->c_val == pri) { 1274 p_s = c->c_name; 1275 break; 1276 } 1277 } 1278 } 1279 if (!f_s) { 1280 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1281 f_s = f_n; 1282 } 1283 if (!p_s) { 1284 snprintf(p_n, sizeof p_n, "%d", pri); 1285 p_s = p_n; 1286 } 1287 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1288 iov[2] = (struct iovec){ 1289 .iov_base = fp_buf, 1290 .iov_len = strlen(fp_buf) 1291 }; 1292 } else { 1293 iov[2] = (struct iovec){ 1294 .iov_base = nul, 1295 .iov_len = 0 1296 }; 1297 } 1298 iov[3] = (struct iovec){ 1299 .iov_base = f->f_prevhost, 1300 .iov_len = strlen(f->f_prevhost) 1301 }; 1302 iov[4] = (struct iovec){ 1303 .iov_base = space, 1304 .iov_len = 1 1305 }; 1306 if (msg) { 1307 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1308 if (wmsg == NULL) { 1309 logerror("strdup"); 1310 exit(1); 1311 } 1312 iov[5] = (struct iovec){ 1313 .iov_base = wmsg, 1314 .iov_len = strlen(msg) 1315 }; 1316 } else if (f->f_prevcount > 1) { 1317 iov[5] = (struct iovec){ 1318 .iov_base = repbuf, 1319 .iov_len = snprintf(repbuf, sizeof(repbuf), 1320 "last message repeated %d times", f->f_prevcount) 1321 }; 1322 } else { 1323 iov[5] = (struct iovec){ 1324 .iov_base = f->f_prevline, 1325 .iov_len = f->f_prevlen 1326 }; 1327 } 1328 dprintf("Logging to %s", TypeNames[f->f_type]); 1329 f->f_time = now; 1330 1331 switch (f->f_type) { 1332 case F_UNUSED: 1333 dprintf("\n"); 1334 break; 1335 1336 case F_FORW: 1337 dprintf(" %s", f->fu_forw_hname); 1338 switch (f->fu_forw_addr->ai_addr->sa_family) { 1339 #ifdef INET 1340 case AF_INET: 1341 dprintf(":%d\n", 1342 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1343 break; 1344 #endif 1345 #ifdef INET6 1346 case AF_INET6: 1347 dprintf(":%d\n", 1348 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1349 break; 1350 #endif 1351 default: 1352 dprintf("\n"); 1353 } 1354 /* check for local vs remote messages */ 1355 if (strcasecmp(f->f_prevhost, LocalHostName)) 1356 l = snprintf(line, sizeof line - 1, 1357 "<%d>%.15s Forwarded from %s: %s", 1358 f->f_prevpri, (char *)iov[0].iov_base, 1359 f->f_prevhost, (char *)iov[5].iov_base); 1360 else 1361 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1362 f->f_prevpri, (char *)iov[0].iov_base, 1363 (char *)iov[5].iov_base); 1364 if (l < 0) 1365 l = 0; 1366 else if (l > MAXLINE) 1367 l = MAXLINE; 1368 1369 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1370 struct socklist *sl; 1371 1372 STAILQ_FOREACH(sl, &shead, next) { 1373 if (sl->sl_ss.ss_family == AF_LOCAL || 1374 sl->sl_ss.ss_family == AF_UNSPEC || 1375 sl->sl_socket < 0) 1376 continue; 1377 lsent = sendto(sl->sl_socket, line, l, 0, 1378 r->ai_addr, r->ai_addrlen); 1379 if (lsent == l) 1380 break; 1381 } 1382 if (lsent == l && !send_to_all) 1383 break; 1384 } 1385 dprintf("lsent/l: %d/%d\n", lsent, l); 1386 if (lsent != l) { 1387 int e = errno; 1388 logerror("sendto"); 1389 errno = e; 1390 switch (errno) { 1391 case ENOBUFS: 1392 case ENETDOWN: 1393 case ENETUNREACH: 1394 case EHOSTUNREACH: 1395 case EHOSTDOWN: 1396 case EADDRNOTAVAIL: 1397 break; 1398 /* case EBADF: */ 1399 /* case EACCES: */ 1400 /* case ENOTSOCK: */ 1401 /* case EFAULT: */ 1402 /* case EMSGSIZE: */ 1403 /* case EAGAIN: */ 1404 /* case ENOBUFS: */ 1405 /* case ECONNREFUSED: */ 1406 default: 1407 dprintf("removing entry: errno=%d\n", e); 1408 f->f_type = F_UNUSED; 1409 break; 1410 } 1411 } 1412 break; 1413 1414 case F_FILE: 1415 dprintf(" %s\n", f->fu_fname); 1416 iov[6] = (struct iovec){ 1417 .iov_base = lf, 1418 .iov_len = 1 1419 }; 1420 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1421 /* 1422 * If writev(2) fails for potentially transient errors 1423 * like the filesystem being full, ignore it. 1424 * Otherwise remove this logfile from the list. 1425 */ 1426 if (errno != ENOSPC) { 1427 int e = errno; 1428 close_filed(f); 1429 errno = e; 1430 logerror(f->fu_fname); 1431 } 1432 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1433 f->f_flags |= FFLAG_NEEDSYNC; 1434 needdofsync = 1; 1435 } 1436 break; 1437 1438 case F_PIPE: 1439 dprintf(" %s\n", f->fu_pipe_pname); 1440 iov[6] = (struct iovec){ 1441 .iov_base = lf, 1442 .iov_len = 1 1443 }; 1444 if (f->fu_pipe_pid == 0) { 1445 if ((f->f_file = p_open(f->fu_pipe_pname, 1446 &f->fu_pipe_pid)) < 0) { 1447 logerror(f->fu_pipe_pname); 1448 break; 1449 } 1450 } 1451 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1452 int e = errno; 1453 1454 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1455 close_filed(f); 1456 errno = e; 1457 logerror(f->fu_pipe_pname); 1458 } 1459 break; 1460 1461 case F_CONSOLE: 1462 if (flags & IGN_CONS) { 1463 dprintf(" (ignored)\n"); 1464 break; 1465 } 1466 /* FALLTHROUGH */ 1467 1468 case F_TTY: 1469 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1470 iov[6] = (struct iovec){ 1471 .iov_base = crlf, 1472 .iov_len = 2 1473 }; 1474 errno = 0; /* ttymsg() only sometimes returns an errno */ 1475 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1476 f->f_type = F_UNUSED; 1477 logerror(msgret); 1478 } 1479 break; 1480 1481 case F_USERS: 1482 case F_WALL: 1483 dprintf("\n"); 1484 iov[6] = (struct iovec){ 1485 .iov_base = crlf, 1486 .iov_len = 2 1487 }; 1488 wallmsg(f, iov, nitems(iov)); 1489 break; 1490 } 1491 f->f_prevcount = 0; 1492 free(wmsg); 1493 } 1494 1495 /* 1496 * WALLMSG -- Write a message to the world at large 1497 * 1498 * Write the specified message to either the entire 1499 * world, or a list of approved users. 1500 */ 1501 static void 1502 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1503 { 1504 static int reenter; /* avoid calling ourselves */ 1505 struct utmpx *ut; 1506 int i; 1507 const char *p; 1508 1509 if (reenter++) 1510 return; 1511 setutxent(); 1512 /* NOSTRICT */ 1513 while ((ut = getutxent()) != NULL) { 1514 if (ut->ut_type != USER_PROCESS) 1515 continue; 1516 if (f->f_type == F_WALL) { 1517 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1518 TTYMSGTIME)) != NULL) { 1519 errno = 0; /* already in msg */ 1520 logerror(p); 1521 } 1522 continue; 1523 } 1524 /* should we send the message to this user? */ 1525 for (i = 0; i < MAXUNAMES; i++) { 1526 if (!f->fu_uname[i][0]) 1527 break; 1528 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1529 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1530 TTYMSGTIME)) != NULL) { 1531 errno = 0; /* already in msg */ 1532 logerror(p); 1533 } 1534 break; 1535 } 1536 } 1537 } 1538 endutxent(); 1539 reenter = 0; 1540 } 1541 1542 /* 1543 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1544 */ 1545 static const char * 1546 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1547 { 1548 static char device[1024]; 1549 static char errbuf[1024]; 1550 struct stat sb; 1551 1552 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1553 1554 if (stat(device, &sb) < 0) { 1555 (void) snprintf(errbuf, sizeof(errbuf), 1556 "%s: %s", device, strerror(errno)); 1557 return (errbuf); 1558 } 1559 if ((sb.st_mode & S_IWGRP) == 0) 1560 /* Messages disabled. */ 1561 return (NULL); 1562 return ttymsg(iov, iovcnt, line, tmout); 1563 } 1564 1565 static void 1566 reapchild(int signo __unused) 1567 { 1568 int status; 1569 pid_t pid; 1570 struct filed *f; 1571 1572 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1573 /* First, look if it's a process from the dead queue. */ 1574 if (deadq_removebypid(pid)) 1575 continue; 1576 1577 /* Now, look in list of active processes. */ 1578 STAILQ_FOREACH(f, &fhead, next) { 1579 if (f->f_type == F_PIPE && 1580 f->fu_pipe_pid == pid) { 1581 close_filed(f); 1582 log_deadchild(pid, status, f->fu_pipe_pname); 1583 break; 1584 } 1585 } 1586 } 1587 WantReapchild = 0; 1588 } 1589 1590 /* 1591 * Return a printable representation of a host address. 1592 */ 1593 static const char * 1594 cvthname(struct sockaddr *f) 1595 { 1596 int error, hl; 1597 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1598 1599 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1600 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1601 NI_NUMERICHOST); 1602 if (error) { 1603 dprintf("Malformed from address %s\n", gai_strerror(error)); 1604 return ("???"); 1605 } 1606 dprintf("cvthname(%s)\n", ip); 1607 1608 if (!resolve) 1609 return (ip); 1610 1611 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1612 NULL, 0, NI_NAMEREQD); 1613 if (error) { 1614 dprintf("Host name for your address (%s) unknown\n", ip); 1615 return (ip); 1616 } 1617 hl = strlen(hname); 1618 if (hl > 0 && hname[hl-1] == '.') 1619 hname[--hl] = '\0'; 1620 trimdomain(hname, hl); 1621 return (hname); 1622 } 1623 1624 static void 1625 dodie(int signo) 1626 { 1627 1628 WantDie = signo; 1629 } 1630 1631 static void 1632 domark(int signo __unused) 1633 { 1634 1635 MarkSet = 1; 1636 } 1637 1638 /* 1639 * Print syslogd errors some place. 1640 */ 1641 static void 1642 logerror(const char *type) 1643 { 1644 char buf[512]; 1645 static int recursed = 0; 1646 1647 /* If there's an error while trying to log an error, give up. */ 1648 if (recursed) 1649 return; 1650 recursed++; 1651 if (errno) 1652 (void)snprintf(buf, 1653 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1654 else 1655 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1656 errno = 0; 1657 dprintf("%s\n", buf); 1658 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1659 recursed--; 1660 } 1661 1662 static void 1663 die(int signo) 1664 { 1665 struct filed *f; 1666 struct socklist *sl; 1667 char buf[100]; 1668 1669 STAILQ_FOREACH(f, &fhead, next) { 1670 /* flush any pending output */ 1671 if (f->f_prevcount) 1672 fprintlog(f, 0, (char *)NULL); 1673 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 1674 close_filed(f); 1675 } 1676 if (signo) { 1677 dprintf("syslogd: exiting on signal %d\n", signo); 1678 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1679 errno = 0; 1680 logerror(buf); 1681 } 1682 STAILQ_FOREACH(sl, &shead, next) { 1683 if (sl->sl_ss.ss_family == AF_LOCAL) 1684 unlink(sl->sl_peer->pe_name); 1685 } 1686 pidfile_remove(pfh); 1687 1688 exit(1); 1689 } 1690 1691 static int 1692 configfiles(const struct dirent *dp) 1693 { 1694 const char *p; 1695 size_t ext_len; 1696 1697 if (dp->d_name[0] == '.') 1698 return (0); 1699 1700 ext_len = sizeof(include_ext) -1; 1701 1702 if (dp->d_namlen <= ext_len) 1703 return (0); 1704 1705 p = &dp->d_name[dp->d_namlen - ext_len]; 1706 if (strcmp(p, include_ext) != 0) 1707 return (0); 1708 1709 return (1); 1710 } 1711 1712 static void 1713 readconfigfile(FILE *cf, int allow_includes) 1714 { 1715 FILE *cf2; 1716 struct filed *f; 1717 struct dirent **ent; 1718 char cline[LINE_MAX]; 1719 char host[MAXHOSTNAMELEN]; 1720 char prog[LINE_MAX]; 1721 char file[MAXPATHLEN]; 1722 char *p, *tmp; 1723 int i, nents; 1724 size_t include_len; 1725 1726 /* 1727 * Foreach line in the conf table, open that file. 1728 */ 1729 include_len = sizeof(include_str) -1; 1730 (void)strlcpy(host, "*", sizeof(host)); 1731 (void)strlcpy(prog, "*", sizeof(prog)); 1732 while (fgets(cline, sizeof(cline), cf) != NULL) { 1733 /* 1734 * check for end-of-section, comments, strip off trailing 1735 * spaces and newline character. #!prog is treated specially: 1736 * following lines apply only to that program. 1737 */ 1738 for (p = cline; isspace(*p); ++p) 1739 continue; 1740 if (*p == 0) 1741 continue; 1742 if (allow_includes && 1743 strncmp(p, include_str, include_len) == 0 && 1744 isspace(p[include_len])) { 1745 p += include_len; 1746 while (isspace(*p)) 1747 p++; 1748 tmp = p; 1749 while (*tmp != '\0' && !isspace(*tmp)) 1750 tmp++; 1751 *tmp = '\0'; 1752 dprintf("Trying to include files in '%s'\n", p); 1753 nents = scandir(p, &ent, configfiles, alphasort); 1754 if (nents == -1) { 1755 dprintf("Unable to open '%s': %s\n", p, 1756 strerror(errno)); 1757 continue; 1758 } 1759 for (i = 0; i < nents; i++) { 1760 if (snprintf(file, sizeof(file), "%s/%s", p, 1761 ent[i]->d_name) >= (int)sizeof(file)) { 1762 dprintf("ignoring path too long: " 1763 "'%s/%s'\n", p, ent[i]->d_name); 1764 free(ent[i]); 1765 continue; 1766 } 1767 free(ent[i]); 1768 cf2 = fopen(file, "r"); 1769 if (cf2 == NULL) 1770 continue; 1771 dprintf("reading %s\n", file); 1772 readconfigfile(cf2, 0); 1773 fclose(cf2); 1774 } 1775 free(ent); 1776 continue; 1777 } 1778 if (*p == '#') { 1779 p++; 1780 if (*p != '!' && *p != '+' && *p != '-') 1781 continue; 1782 } 1783 if (*p == '+' || *p == '-') { 1784 host[0] = *p++; 1785 while (isspace(*p)) 1786 p++; 1787 if ((!*p) || (*p == '*')) { 1788 (void)strlcpy(host, "*", sizeof(host)); 1789 continue; 1790 } 1791 if (*p == '@') 1792 p = LocalHostName; 1793 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1794 if (!isalnum(*p) && *p != '.' && *p != '-' 1795 && *p != ',' && *p != ':' && *p != '%') 1796 break; 1797 host[i] = *p++; 1798 } 1799 host[i] = '\0'; 1800 continue; 1801 } 1802 if (*p == '!') { 1803 p++; 1804 while (isspace(*p)) p++; 1805 if ((!*p) || (*p == '*')) { 1806 (void)strlcpy(prog, "*", sizeof(prog)); 1807 continue; 1808 } 1809 for (i = 0; i < LINE_MAX - 1; i++) { 1810 if (!isprint(p[i]) || isspace(p[i])) 1811 break; 1812 prog[i] = p[i]; 1813 } 1814 prog[i] = 0; 1815 continue; 1816 } 1817 for (p = cline + 1; *p != '\0'; p++) { 1818 if (*p != '#') 1819 continue; 1820 if (*(p - 1) == '\\') { 1821 strcpy(p - 1, p); 1822 p--; 1823 continue; 1824 } 1825 *p = '\0'; 1826 break; 1827 } 1828 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1829 cline[i] = '\0'; 1830 f = cfline(cline, prog, host); 1831 if (f != NULL) 1832 addfile(f); 1833 } 1834 } 1835 1836 static void 1837 sighandler(int signo) 1838 { 1839 1840 /* Send an wake-up signal to the select() loop. */ 1841 write(sigpipe[1], &signo, sizeof(signo)); 1842 } 1843 1844 /* 1845 * INIT -- Initialize syslogd from configuration table 1846 */ 1847 static void 1848 init(int signo) 1849 { 1850 int i; 1851 FILE *cf; 1852 struct filed *f; 1853 char *p; 1854 char oldLocalHostName[MAXHOSTNAMELEN]; 1855 char hostMsg[2*MAXHOSTNAMELEN+40]; 1856 char bootfileMsg[LINE_MAX]; 1857 1858 dprintf("init\n"); 1859 WantInitialize = 0; 1860 1861 /* 1862 * Load hostname (may have changed). 1863 */ 1864 if (signo != 0) 1865 (void)strlcpy(oldLocalHostName, LocalHostName, 1866 sizeof(oldLocalHostName)); 1867 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1868 err(EX_OSERR, "gethostname() failed"); 1869 if ((p = strchr(LocalHostName, '.')) != NULL) { 1870 *p++ = '\0'; 1871 LocalDomain = p; 1872 } else { 1873 LocalDomain = ""; 1874 } 1875 1876 /* 1877 * Load / reload timezone data (in case it changed). 1878 * 1879 * Just calling tzset() again does not work, the timezone code 1880 * caches the result. However, by setting the TZ variable, one 1881 * can defeat the caching and have the timezone code really 1882 * reload the timezone data. Respect any initial setting of 1883 * TZ, in case the system is configured specially. 1884 */ 1885 dprintf("loading timezone data via tzset()\n"); 1886 if (getenv("TZ")) { 1887 tzset(); 1888 } else { 1889 setenv("TZ", ":/etc/localtime", 1); 1890 tzset(); 1891 unsetenv("TZ"); 1892 } 1893 1894 /* 1895 * Close all open log files. 1896 */ 1897 Initialized = 0; 1898 STAILQ_FOREACH(f, &fhead, next) { 1899 /* flush any pending output */ 1900 if (f->f_prevcount) 1901 fprintlog(f, 0, (char *)NULL); 1902 1903 switch (f->f_type) { 1904 case F_FILE: 1905 case F_FORW: 1906 case F_CONSOLE: 1907 case F_TTY: 1908 close_filed(f); 1909 break; 1910 case F_PIPE: 1911 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1912 close_filed(f); 1913 break; 1914 } 1915 } 1916 while(!STAILQ_EMPTY(&fhead)) { 1917 f = STAILQ_FIRST(&fhead); 1918 STAILQ_REMOVE_HEAD(&fhead, next); 1919 free(f->f_program); 1920 free(f->f_host); 1921 free(f); 1922 } 1923 1924 /* open the configuration file */ 1925 if ((cf = fopen(ConfFile, "r")) == NULL) { 1926 dprintf("cannot open %s\n", ConfFile); 1927 f = cfline("*.ERR\t/dev/console", "*", "*"); 1928 if (f != NULL) 1929 addfile(f); 1930 f = cfline("*.PANIC\t*", "*", "*"); 1931 if (f != NULL) 1932 addfile(f); 1933 Initialized = 1; 1934 1935 return; 1936 } 1937 1938 readconfigfile(cf, 1); 1939 1940 /* close the configuration file */ 1941 (void)fclose(cf); 1942 1943 Initialized = 1; 1944 1945 if (Debug) { 1946 int port; 1947 STAILQ_FOREACH(f, &fhead, next) { 1948 for (i = 0; i <= LOG_NFACILITIES; i++) 1949 if (f->f_pmask[i] == INTERNAL_NOPRI) 1950 printf("X "); 1951 else 1952 printf("%d ", f->f_pmask[i]); 1953 printf("%s: ", TypeNames[f->f_type]); 1954 switch (f->f_type) { 1955 case F_FILE: 1956 printf("%s", f->fu_fname); 1957 break; 1958 1959 case F_CONSOLE: 1960 case F_TTY: 1961 printf("%s%s", _PATH_DEV, f->fu_fname); 1962 break; 1963 1964 case F_FORW: 1965 switch (f->fu_forw_addr->ai_addr->sa_family) { 1966 #ifdef INET 1967 case AF_INET: 1968 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1969 break; 1970 #endif 1971 #ifdef INET6 1972 case AF_INET6: 1973 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 1974 break; 1975 #endif 1976 default: 1977 port = 0; 1978 } 1979 if (port != 514) { 1980 printf("%s:%d", 1981 f->fu_forw_hname, port); 1982 } else { 1983 printf("%s", f->fu_forw_hname); 1984 } 1985 break; 1986 1987 case F_PIPE: 1988 printf("%s", f->fu_pipe_pname); 1989 break; 1990 1991 case F_USERS: 1992 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1993 printf("%s, ", f->fu_uname[i]); 1994 break; 1995 } 1996 if (f->f_program) 1997 printf(" (%s)", f->f_program); 1998 printf("\n"); 1999 } 2000 } 2001 2002 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 2003 dprintf("syslogd: restarted\n"); 2004 /* 2005 * Log a change in hostname, but only on a restart. 2006 */ 2007 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2008 (void)snprintf(hostMsg, sizeof(hostMsg), 2009 "syslogd: hostname changed, \"%s\" to \"%s\"", 2010 oldLocalHostName, LocalHostName); 2011 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 2012 dprintf("%s\n", hostMsg); 2013 } 2014 /* 2015 * Log the kernel boot file if we aren't going to use it as 2016 * the prefix, and if this is *not* a restart. 2017 */ 2018 if (signo == 0 && !use_bootfile) { 2019 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2020 "syslogd: kernel boot file is %s", bootfile); 2021 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 2022 dprintf("%s\n", bootfileMsg); 2023 } 2024 } 2025 2026 /* 2027 * Crack a configuration file line 2028 */ 2029 static struct filed * 2030 cfline(const char *line, const char *prog, const char *host) 2031 { 2032 struct filed *f; 2033 struct addrinfo hints, *res; 2034 int error, i, pri, syncfile; 2035 const char *p, *q; 2036 char *bp; 2037 char buf[MAXLINE], ebuf[100]; 2038 2039 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 2040 2041 f = calloc(1, sizeof(*f)); 2042 if (f == NULL) { 2043 logerror("malloc"); 2044 exit(1); 2045 } 2046 errno = 0; /* keep strerror() stuff out of logerror messages */ 2047 2048 for (i = 0; i <= LOG_NFACILITIES; i++) 2049 f->f_pmask[i] = INTERNAL_NOPRI; 2050 2051 /* save hostname if any */ 2052 if (host && *host == '*') 2053 host = NULL; 2054 if (host) { 2055 int hl; 2056 2057 f->f_host = strdup(host); 2058 if (f->f_host == NULL) { 2059 logerror("strdup"); 2060 exit(1); 2061 } 2062 hl = strlen(f->f_host); 2063 if (hl > 0 && f->f_host[hl-1] == '.') 2064 f->f_host[--hl] = '\0'; 2065 trimdomain(f->f_host, hl); 2066 } 2067 2068 /* save program name if any */ 2069 if (prog && *prog == '*') 2070 prog = NULL; 2071 if (prog) { 2072 f->f_program = strdup(prog); 2073 if (f->f_program == NULL) { 2074 logerror("strdup"); 2075 exit(1); 2076 } 2077 } 2078 2079 /* scan through the list of selectors */ 2080 for (p = line; *p && *p != '\t' && *p != ' ';) { 2081 int pri_done; 2082 int pri_cmp; 2083 int pri_invert; 2084 2085 /* find the end of this facility name list */ 2086 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2087 continue; 2088 2089 /* get the priority comparison */ 2090 pri_cmp = 0; 2091 pri_done = 0; 2092 pri_invert = 0; 2093 if (*q == '!') { 2094 pri_invert = 1; 2095 q++; 2096 } 2097 while (!pri_done) { 2098 switch (*q) { 2099 case '<': 2100 pri_cmp |= PRI_LT; 2101 q++; 2102 break; 2103 case '=': 2104 pri_cmp |= PRI_EQ; 2105 q++; 2106 break; 2107 case '>': 2108 pri_cmp |= PRI_GT; 2109 q++; 2110 break; 2111 default: 2112 pri_done++; 2113 break; 2114 } 2115 } 2116 2117 /* collect priority name */ 2118 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2119 *bp++ = *q++; 2120 *bp = '\0'; 2121 2122 /* skip cruft */ 2123 while (strchr(",;", *q)) 2124 q++; 2125 2126 /* decode priority name */ 2127 if (*buf == '*') { 2128 pri = LOG_PRIMASK; 2129 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2130 } else { 2131 /* Ignore trailing spaces. */ 2132 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2133 buf[i] = '\0'; 2134 2135 pri = decode(buf, prioritynames); 2136 if (pri < 0) { 2137 errno = 0; 2138 (void)snprintf(ebuf, sizeof ebuf, 2139 "unknown priority name \"%s\"", buf); 2140 logerror(ebuf); 2141 free(f); 2142 return (NULL); 2143 } 2144 } 2145 if (!pri_cmp) 2146 pri_cmp = (UniquePriority) 2147 ? (PRI_EQ) 2148 : (PRI_EQ | PRI_GT) 2149 ; 2150 if (pri_invert) 2151 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2152 2153 /* scan facilities */ 2154 while (*p && !strchr("\t.; ", *p)) { 2155 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2156 *bp++ = *p++; 2157 *bp = '\0'; 2158 2159 if (*buf == '*') { 2160 for (i = 0; i < LOG_NFACILITIES; i++) { 2161 f->f_pmask[i] = pri; 2162 f->f_pcmp[i] = pri_cmp; 2163 } 2164 } else { 2165 i = decode(buf, facilitynames); 2166 if (i < 0) { 2167 errno = 0; 2168 (void)snprintf(ebuf, sizeof ebuf, 2169 "unknown facility name \"%s\"", 2170 buf); 2171 logerror(ebuf); 2172 free(f); 2173 return (NULL); 2174 } 2175 f->f_pmask[i >> 3] = pri; 2176 f->f_pcmp[i >> 3] = pri_cmp; 2177 } 2178 while (*p == ',' || *p == ' ') 2179 p++; 2180 } 2181 2182 p = q; 2183 } 2184 2185 /* skip to action part */ 2186 while (*p == '\t' || *p == ' ') 2187 p++; 2188 2189 if (*p == '-') { 2190 syncfile = 0; 2191 p++; 2192 } else 2193 syncfile = 1; 2194 2195 switch (*p) { 2196 case '@': 2197 { 2198 char *tp; 2199 char endkey = ':'; 2200 /* 2201 * scan forward to see if there is a port defined. 2202 * so we can't use strlcpy.. 2203 */ 2204 i = sizeof(f->fu_forw_hname); 2205 tp = f->fu_forw_hname; 2206 p++; 2207 2208 /* 2209 * an ipv6 address should start with a '[' in that case 2210 * we should scan for a ']' 2211 */ 2212 if (*p == '[') { 2213 p++; 2214 endkey = ']'; 2215 } 2216 while (*p && (*p != endkey) && (i-- > 0)) { 2217 *tp++ = *p++; 2218 } 2219 if (endkey == ']' && *p == endkey) 2220 p++; 2221 *tp = '\0'; 2222 } 2223 /* See if we copied a domain and have a port */ 2224 if (*p == ':') 2225 p++; 2226 else 2227 p = NULL; 2228 2229 hints = (struct addrinfo){ 2230 .ai_family = family, 2231 .ai_socktype = SOCK_DGRAM 2232 }; 2233 error = getaddrinfo(f->fu_forw_hname, 2234 p ? p : "syslog", &hints, &res); 2235 if (error) { 2236 logerror(gai_strerror(error)); 2237 break; 2238 } 2239 f->fu_forw_addr = res; 2240 f->f_type = F_FORW; 2241 break; 2242 2243 case '/': 2244 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2245 f->f_type = F_UNUSED; 2246 logerror(p); 2247 break; 2248 } 2249 if (syncfile) 2250 f->f_flags |= FFLAG_SYNC; 2251 if (isatty(f->f_file)) { 2252 if (strcmp(p, ctty) == 0) 2253 f->f_type = F_CONSOLE; 2254 else 2255 f->f_type = F_TTY; 2256 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2257 sizeof(f->fu_fname)); 2258 } else { 2259 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2260 f->f_type = F_FILE; 2261 } 2262 break; 2263 2264 case '|': 2265 f->fu_pipe_pid = 0; 2266 (void)strlcpy(f->fu_pipe_pname, p + 1, 2267 sizeof(f->fu_pipe_pname)); 2268 f->f_type = F_PIPE; 2269 break; 2270 2271 case '*': 2272 f->f_type = F_WALL; 2273 break; 2274 2275 default: 2276 for (i = 0; i < MAXUNAMES && *p; i++) { 2277 for (q = p; *q && *q != ','; ) 2278 q++; 2279 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2280 if ((q - p) >= MAXLOGNAME) 2281 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2282 else 2283 f->fu_uname[i][q - p] = '\0'; 2284 while (*q == ',' || *q == ' ') 2285 q++; 2286 p = q; 2287 } 2288 f->f_type = F_USERS; 2289 break; 2290 } 2291 return (f); 2292 } 2293 2294 2295 /* 2296 * Decode a symbolic name to a numeric value 2297 */ 2298 static int 2299 decode(const char *name, const CODE *codetab) 2300 { 2301 const CODE *c; 2302 char *p, buf[40]; 2303 2304 if (isdigit(*name)) 2305 return (atoi(name)); 2306 2307 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2308 if (isupper(*name)) 2309 *p = tolower(*name); 2310 else 2311 *p = *name; 2312 } 2313 *p = '\0'; 2314 for (c = codetab; c->c_name; c++) 2315 if (!strcmp(buf, c->c_name)) 2316 return (c->c_val); 2317 2318 return (-1); 2319 } 2320 2321 static void 2322 markit(void) 2323 { 2324 struct filed *f; 2325 struct deadq_entry *dq, *dq0; 2326 2327 now = time((time_t *)NULL); 2328 MarkSeq += TIMERINTVL; 2329 if (MarkSeq >= MarkInterval) { 2330 logmsg(LOG_INFO, "-- MARK --", 2331 LocalHostName, ADDDATE|MARK); 2332 MarkSeq = 0; 2333 } 2334 2335 STAILQ_FOREACH(f, &fhead, next) { 2336 if (f->f_prevcount && now >= REPEATTIME(f)) { 2337 dprintf("flush %s: repeated %d times, %d sec.\n", 2338 TypeNames[f->f_type], f->f_prevcount, 2339 repeatinterval[f->f_repeatcount]); 2340 fprintlog(f, 0, (char *)NULL); 2341 BACKOFF(f); 2342 } 2343 } 2344 2345 /* Walk the dead queue, and see if we should signal somebody. */ 2346 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2347 switch (dq->dq_timeout) { 2348 case 0: 2349 /* Already signalled once, try harder now. */ 2350 if (kill(dq->dq_pid, SIGKILL) != 0) 2351 (void)deadq_remove(dq); 2352 break; 2353 2354 case 1: 2355 /* 2356 * Timed out on dead queue, send terminate 2357 * signal. Note that we leave the removal 2358 * from the dead queue to reapchild(), which 2359 * will also log the event (unless the process 2360 * didn't even really exist, in case we simply 2361 * drop it from the dead queue). 2362 */ 2363 if (kill(dq->dq_pid, SIGTERM) != 0) 2364 (void)deadq_remove(dq); 2365 else 2366 dq->dq_timeout--; 2367 break; 2368 default: 2369 dq->dq_timeout--; 2370 } 2371 } 2372 MarkSet = 0; 2373 (void)alarm(TIMERINTVL); 2374 } 2375 2376 /* 2377 * fork off and become a daemon, but wait for the child to come online 2378 * before returning to the parent, or we get disk thrashing at boot etc. 2379 * Set a timer so we don't hang forever if it wedges. 2380 */ 2381 static int 2382 waitdaemon(int maxwait) 2383 { 2384 int fd; 2385 int status; 2386 pid_t pid, childpid; 2387 2388 switch (childpid = fork()) { 2389 case -1: 2390 return (-1); 2391 case 0: 2392 break; 2393 default: 2394 signal(SIGALRM, timedout); 2395 alarm(maxwait); 2396 while ((pid = wait3(&status, 0, NULL)) != -1) { 2397 if (WIFEXITED(status)) 2398 errx(1, "child pid %d exited with return code %d", 2399 pid, WEXITSTATUS(status)); 2400 if (WIFSIGNALED(status)) 2401 errx(1, "child pid %d exited on signal %d%s", 2402 pid, WTERMSIG(status), 2403 WCOREDUMP(status) ? " (core dumped)" : 2404 ""); 2405 if (pid == childpid) /* it's gone... */ 2406 break; 2407 } 2408 exit(0); 2409 } 2410 2411 if (setsid() == -1) 2412 return (-1); 2413 2414 (void)chdir("/"); 2415 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2416 (void)dup2(fd, STDIN_FILENO); 2417 (void)dup2(fd, STDOUT_FILENO); 2418 (void)dup2(fd, STDERR_FILENO); 2419 if (fd > STDERR_FILENO) 2420 (void)close(fd); 2421 } 2422 return (getppid()); 2423 } 2424 2425 /* 2426 * We get a SIGALRM from the child when it's running and finished doing it's 2427 * fsync()'s or O_SYNC writes for all the boot messages. 2428 * 2429 * We also get a signal from the kernel if the timer expires, so check to 2430 * see what happened. 2431 */ 2432 static void 2433 timedout(int sig __unused) 2434 { 2435 int left; 2436 left = alarm(0); 2437 signal(SIGALRM, SIG_DFL); 2438 if (left == 0) 2439 errx(1, "timed out waiting for child"); 2440 else 2441 _exit(0); 2442 } 2443 2444 /* 2445 * Add `s' to the list of allowable peer addresses to accept messages 2446 * from. 2447 * 2448 * `s' is a string in the form: 2449 * 2450 * [*]domainname[:{servicename|portnumber|*}] 2451 * 2452 * or 2453 * 2454 * netaddr/maskbits[:{servicename|portnumber|*}] 2455 * 2456 * Returns -1 on error, 0 if the argument was valid. 2457 */ 2458 static int 2459 allowaddr(char *s) 2460 { 2461 #if defined(INET) || defined(INET6) 2462 char *cp1, *cp2; 2463 struct allowedpeer *ap; 2464 struct servent *se; 2465 int masklen = -1; 2466 struct addrinfo hints, *res = NULL; 2467 #ifdef INET 2468 in_addr_t *addrp, *maskp; 2469 #endif 2470 #ifdef INET6 2471 uint32_t *addr6p, *mask6p; 2472 #endif 2473 char ip[NI_MAXHOST]; 2474 2475 ap = calloc(1, sizeof(*ap)); 2476 if (ap == NULL) 2477 err(1, "malloc failed"); 2478 2479 #ifdef INET6 2480 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2481 #endif 2482 cp1 = s; 2483 if ((cp1 = strrchr(cp1, ':'))) { 2484 /* service/port provided */ 2485 *cp1++ = '\0'; 2486 if (strlen(cp1) == 1 && *cp1 == '*') 2487 /* any port allowed */ 2488 ap->port = 0; 2489 else if ((se = getservbyname(cp1, "udp"))) { 2490 ap->port = ntohs(se->s_port); 2491 } else { 2492 ap->port = strtol(cp1, &cp2, 0); 2493 /* port not numeric */ 2494 if (*cp2 != '\0') 2495 goto err; 2496 } 2497 } else { 2498 if ((se = getservbyname("syslog", "udp"))) 2499 ap->port = ntohs(se->s_port); 2500 else 2501 /* sanity, should not happen */ 2502 ap->port = 514; 2503 } 2504 2505 if ((cp1 = strchr(s, '/')) != NULL && 2506 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2507 *cp1 = '\0'; 2508 if ((masklen = atoi(cp1 + 1)) < 0) 2509 goto err; 2510 } 2511 #ifdef INET6 2512 if (*s == '[') { 2513 cp2 = s + strlen(s) - 1; 2514 if (*cp2 == ']') { 2515 ++s; 2516 *cp2 = '\0'; 2517 } else { 2518 cp2 = NULL; 2519 } 2520 } else { 2521 cp2 = NULL; 2522 } 2523 #endif 2524 hints = (struct addrinfo){ 2525 .ai_family = PF_UNSPEC, 2526 .ai_socktype = SOCK_DGRAM, 2527 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2528 }; 2529 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2530 ap->isnumeric = 1; 2531 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2532 ap->a_mask = (struct sockaddr_storage){ 2533 .ss_family = res->ai_family, 2534 .ss_len = res->ai_addrlen 2535 }; 2536 switch (res->ai_family) { 2537 #ifdef INET 2538 case AF_INET: 2539 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2540 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2541 if (masklen < 0) { 2542 /* use default netmask */ 2543 if (IN_CLASSA(ntohl(*addrp))) 2544 *maskp = htonl(IN_CLASSA_NET); 2545 else if (IN_CLASSB(ntohl(*addrp))) 2546 *maskp = htonl(IN_CLASSB_NET); 2547 else 2548 *maskp = htonl(IN_CLASSC_NET); 2549 } else if (masklen == 0) { 2550 *maskp = 0; 2551 } else if (masklen <= 32) { 2552 /* convert masklen to netmask */ 2553 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2554 } else { 2555 goto err; 2556 } 2557 /* Lose any host bits in the network number. */ 2558 *addrp &= *maskp; 2559 break; 2560 #endif 2561 #ifdef INET6 2562 case AF_INET6: 2563 if (masklen > 128) 2564 goto err; 2565 2566 if (masklen < 0) 2567 masklen = 128; 2568 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2569 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2570 /* convert masklen to netmask */ 2571 while (masklen > 0) { 2572 if (masklen < 32) { 2573 *mask6p = 2574 htonl(~(0xffffffff >> masklen)); 2575 *addr6p &= *mask6p; 2576 break; 2577 } else { 2578 *mask6p++ = 0xffffffff; 2579 addr6p++; 2580 masklen -= 32; 2581 } 2582 } 2583 break; 2584 #endif 2585 default: 2586 goto err; 2587 } 2588 freeaddrinfo(res); 2589 } else { 2590 /* arg `s' is domain name */ 2591 ap->isnumeric = 0; 2592 ap->a_name = s; 2593 if (cp1) 2594 *cp1 = '/'; 2595 #ifdef INET6 2596 if (cp2) { 2597 *cp2 = ']'; 2598 --s; 2599 } 2600 #endif 2601 } 2602 STAILQ_INSERT_TAIL(&aphead, ap, next); 2603 2604 if (Debug) { 2605 printf("allowaddr: rule "); 2606 if (ap->isnumeric) { 2607 printf("numeric, "); 2608 getnameinfo(sstosa(&ap->a_addr), 2609 (sstosa(&ap->a_addr))->sa_len, 2610 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2611 printf("addr = %s, ", ip); 2612 getnameinfo(sstosa(&ap->a_mask), 2613 (sstosa(&ap->a_mask))->sa_len, 2614 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2615 printf("mask = %s; ", ip); 2616 } else { 2617 printf("domainname = %s; ", ap->a_name); 2618 } 2619 printf("port = %d\n", ap->port); 2620 } 2621 #endif 2622 2623 return (0); 2624 err: 2625 if (res != NULL) 2626 freeaddrinfo(res); 2627 free(ap); 2628 return (-1); 2629 } 2630 2631 /* 2632 * Validate that the remote peer has permission to log to us. 2633 */ 2634 static int 2635 validate(struct sockaddr *sa, const char *hname) 2636 { 2637 int i; 2638 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2639 struct allowedpeer *ap; 2640 #ifdef INET 2641 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2642 #endif 2643 #ifdef INET6 2644 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2645 #endif 2646 struct addrinfo hints, *res; 2647 u_short sport; 2648 int num = 0; 2649 2650 STAILQ_FOREACH(ap, &aphead, next) { 2651 num++; 2652 } 2653 dprintf("# of validation rule: %d\n", num); 2654 if (num == 0) 2655 /* traditional behaviour, allow everything */ 2656 return (1); 2657 2658 (void)strlcpy(name, hname, sizeof(name)); 2659 hints = (struct addrinfo){ 2660 .ai_family = PF_UNSPEC, 2661 .ai_socktype = SOCK_DGRAM, 2662 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2663 }; 2664 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2665 freeaddrinfo(res); 2666 else if (strchr(name, '.') == NULL) { 2667 strlcat(name, ".", sizeof name); 2668 strlcat(name, LocalDomain, sizeof name); 2669 } 2670 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2671 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2672 return (0); /* for safety, should not occur */ 2673 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2674 ip, port, name); 2675 sport = atoi(port); 2676 2677 /* now, walk down the list */ 2678 i = 0; 2679 STAILQ_FOREACH(ap, &aphead, next) { 2680 i++; 2681 if (ap->port != 0 && ap->port != sport) { 2682 dprintf("rejected in rule %d due to port mismatch.\n", 2683 i); 2684 continue; 2685 } 2686 2687 if (ap->isnumeric) { 2688 if (ap->a_addr.ss_family != sa->sa_family) { 2689 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2690 continue; 2691 } 2692 #ifdef INET 2693 else if (ap->a_addr.ss_family == AF_INET) { 2694 sin4 = satosin(sa); 2695 a4p = satosin(&ap->a_addr); 2696 m4p = satosin(&ap->a_mask); 2697 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2698 != a4p->sin_addr.s_addr) { 2699 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2700 continue; 2701 } 2702 } 2703 #endif 2704 #ifdef INET6 2705 else if (ap->a_addr.ss_family == AF_INET6) { 2706 sin6 = satosin6(sa); 2707 a6p = satosin6(&ap->a_addr); 2708 m6p = satosin6(&ap->a_mask); 2709 if (a6p->sin6_scope_id != 0 && 2710 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2711 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2712 continue; 2713 } 2714 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2715 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2716 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2717 continue; 2718 } 2719 } 2720 #endif 2721 else 2722 continue; 2723 } else { 2724 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2725 FNM_NOMATCH) { 2726 dprintf("rejected in rule %d due to name " 2727 "mismatch.\n", i); 2728 continue; 2729 } 2730 } 2731 dprintf("accepted in rule %d.\n", i); 2732 return (1); /* hooray! */ 2733 } 2734 return (0); 2735 } 2736 2737 /* 2738 * Fairly similar to popen(3), but returns an open descriptor, as 2739 * opposed to a FILE *. 2740 */ 2741 static int 2742 p_open(const char *prog, pid_t *rpid) 2743 { 2744 int pfd[2], nulldesc; 2745 pid_t pid; 2746 char *argv[4]; /* sh -c cmd NULL */ 2747 char errmsg[200]; 2748 2749 if (pipe(pfd) == -1) 2750 return (-1); 2751 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2752 /* we are royally screwed anyway */ 2753 return (-1); 2754 2755 switch ((pid = fork())) { 2756 case -1: 2757 close(nulldesc); 2758 return (-1); 2759 2760 case 0: 2761 (void)setsid(); /* Avoid catching SIGHUPs. */ 2762 argv[0] = strdup("sh"); 2763 argv[1] = strdup("-c"); 2764 argv[2] = strdup(prog); 2765 argv[3] = NULL; 2766 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2767 logerror("strdup"); 2768 exit(1); 2769 } 2770 2771 alarm(0); 2772 2773 /* Restore signals marked as SIG_IGN. */ 2774 (void)signal(SIGINT, SIG_DFL); 2775 (void)signal(SIGQUIT, SIG_DFL); 2776 (void)signal(SIGPIPE, SIG_DFL); 2777 2778 dup2(pfd[0], STDIN_FILENO); 2779 dup2(nulldesc, STDOUT_FILENO); 2780 dup2(nulldesc, STDERR_FILENO); 2781 closefrom(STDERR_FILENO + 1); 2782 2783 (void)execvp(_PATH_BSHELL, argv); 2784 _exit(255); 2785 } 2786 close(nulldesc); 2787 close(pfd[0]); 2788 /* 2789 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2790 * supposed to get an EWOULDBLOCK on writev(2), which is 2791 * caught by the logic above anyway, which will in turn close 2792 * the pipe, and fork a new logging subprocess if necessary. 2793 * The stale subprocess will be killed some time later unless 2794 * it terminated itself due to closing its input pipe (so we 2795 * get rid of really dead puppies). 2796 */ 2797 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2798 /* This is bad. */ 2799 (void)snprintf(errmsg, sizeof errmsg, 2800 "Warning: cannot change pipe to PID %d to " 2801 "non-blocking behaviour.", 2802 (int)pid); 2803 logerror(errmsg); 2804 } 2805 *rpid = pid; 2806 return (pfd[1]); 2807 } 2808 2809 static void 2810 deadq_enter(pid_t pid, const char *name) 2811 { 2812 struct deadq_entry *dq; 2813 int status; 2814 2815 if (pid == 0) 2816 return; 2817 /* 2818 * Be paranoid, if we can't signal the process, don't enter it 2819 * into the dead queue (perhaps it's already dead). If possible, 2820 * we try to fetch and log the child's status. 2821 */ 2822 if (kill(pid, 0) != 0) { 2823 if (waitpid(pid, &status, WNOHANG) > 0) 2824 log_deadchild(pid, status, name); 2825 return; 2826 } 2827 2828 dq = malloc(sizeof(*dq)); 2829 if (dq == NULL) { 2830 logerror("malloc"); 2831 exit(1); 2832 } 2833 *dq = (struct deadq_entry){ 2834 .dq_pid = pid, 2835 .dq_timeout = DQ_TIMO_INIT 2836 }; 2837 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2838 } 2839 2840 static int 2841 deadq_remove(struct deadq_entry *dq) 2842 { 2843 if (dq != NULL) { 2844 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2845 free(dq); 2846 return (1); 2847 } 2848 2849 return (0); 2850 } 2851 2852 static int 2853 deadq_removebypid(pid_t pid) 2854 { 2855 struct deadq_entry *dq; 2856 2857 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2858 if (dq->dq_pid == pid) 2859 break; 2860 } 2861 return (deadq_remove(dq)); 2862 } 2863 2864 static void 2865 log_deadchild(pid_t pid, int status, const char *name) 2866 { 2867 int code; 2868 char buf[256]; 2869 const char *reason; 2870 2871 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2872 if (WIFSIGNALED(status)) { 2873 reason = "due to signal"; 2874 code = WTERMSIG(status); 2875 } else { 2876 reason = "with status"; 2877 code = WEXITSTATUS(status); 2878 if (code == 0) 2879 return; 2880 } 2881 (void)snprintf(buf, sizeof buf, 2882 "Logging subprocess %d (%s) exited %s %d.", 2883 pid, name, reason, code); 2884 logerror(buf); 2885 } 2886 2887 static int 2888 socksetup(struct peer *pe) 2889 { 2890 struct addrinfo hints, *res, *res0; 2891 int error; 2892 char *cp; 2893 int (*sl_recv)(struct socklist *); 2894 /* 2895 * We have to handle this case for backwards compatibility: 2896 * If there are two (or more) colons but no '[' and ']', 2897 * assume this is an inet6 address without a service. 2898 */ 2899 if (pe->pe_name != NULL) { 2900 #ifdef INET6 2901 if (pe->pe_name[0] == '[' && 2902 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2903 pe->pe_name = &pe->pe_name[1]; 2904 *cp = '\0'; 2905 if (cp[1] == ':' && cp[2] != '\0') 2906 pe->pe_serv = cp + 2; 2907 } else { 2908 #endif 2909 cp = strchr(pe->pe_name, ':'); 2910 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2911 *cp = '\0'; 2912 if (cp[1] != '\0') 2913 pe->pe_serv = cp + 1; 2914 if (cp == pe->pe_name) 2915 pe->pe_name = NULL; 2916 } 2917 #ifdef INET6 2918 } 2919 #endif 2920 } 2921 hints = (struct addrinfo){ 2922 .ai_family = AF_UNSPEC, 2923 .ai_socktype = SOCK_DGRAM, 2924 .ai_flags = AI_PASSIVE 2925 }; 2926 if (pe->pe_name != NULL) 2927 dprintf("Trying peer: %s\n", pe->pe_name); 2928 if (pe->pe_serv == NULL) 2929 pe->pe_serv = "syslog"; 2930 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2931 if (error) { 2932 char *msgbuf; 2933 2934 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 2935 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 2936 gai_strerror(error)); 2937 errno = 0; 2938 if (msgbuf == NULL) 2939 logerror(gai_strerror(error)); 2940 else 2941 logerror(msgbuf); 2942 free(msgbuf); 2943 die(0); 2944 } 2945 for (res = res0; res != NULL; res = res->ai_next) { 2946 int s; 2947 2948 if (res->ai_family != AF_LOCAL && 2949 SecureMode > 1) { 2950 /* Only AF_LOCAL in secure mode. */ 2951 continue; 2952 } 2953 if (family != AF_UNSPEC && 2954 res->ai_family != AF_LOCAL && res->ai_family != family) 2955 continue; 2956 2957 s = socket(res->ai_family, res->ai_socktype, 2958 res->ai_protocol); 2959 if (s < 0) { 2960 logerror("socket"); 2961 error++; 2962 continue; 2963 } 2964 #ifdef INET6 2965 if (res->ai_family == AF_INET6) { 2966 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2967 &(int){1}, sizeof(int)) < 0) { 2968 logerror("setsockopt(IPV6_V6ONLY)"); 2969 close(s); 2970 error++; 2971 continue; 2972 } 2973 } 2974 #endif 2975 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2976 &(int){1}, sizeof(int)) < 0) { 2977 logerror("setsockopt(SO_REUSEADDR)"); 2978 close(s); 2979 error++; 2980 continue; 2981 } 2982 2983 /* 2984 * Bind INET and UNIX-domain sockets. 2985 * 2986 * A UNIX-domain socket is always bound to a pathname 2987 * regardless of -N flag. 2988 * 2989 * For INET sockets, RFC 3164 recommends that client 2990 * side message should come from the privileged syslogd port. 2991 * 2992 * If the system administrator chooses not to obey 2993 * this, we can skip the bind() step so that the 2994 * system will choose a port for us. 2995 */ 2996 if (res->ai_family == AF_LOCAL) 2997 unlink(pe->pe_name); 2998 if (res->ai_family == AF_LOCAL || 2999 NoBind == 0 || pe->pe_name != NULL) { 3000 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3001 logerror("bind"); 3002 close(s); 3003 error++; 3004 continue; 3005 } 3006 if (res->ai_family == AF_LOCAL || 3007 SecureMode == 0) 3008 increase_rcvbuf(s); 3009 } 3010 if (res->ai_family == AF_LOCAL && 3011 chmod(pe->pe_name, pe->pe_mode) < 0) { 3012 dprintf("chmod %s: %s\n", pe->pe_name, 3013 strerror(errno)); 3014 close(s); 3015 error++; 3016 continue; 3017 } 3018 dprintf("new socket fd is %d\n", s); 3019 if (res->ai_socktype != SOCK_DGRAM) { 3020 listen(s, 5); 3021 } 3022 sl_recv = socklist_recv_sock; 3023 #if defined(INET) || defined(INET6) 3024 if (SecureMode && (res->ai_family == AF_INET || 3025 res->ai_family == AF_INET6)) { 3026 dprintf("shutdown\n"); 3027 /* Forbid communication in secure mode. */ 3028 if (shutdown(s, SHUT_RD) < 0 && 3029 errno != ENOTCONN) { 3030 logerror("shutdown"); 3031 if (!Debug) 3032 die(0); 3033 } 3034 sl_recv = NULL; 3035 } else 3036 #endif 3037 dprintf("listening on socket\n"); 3038 dprintf("sending on socket\n"); 3039 addsock(res->ai_addr, res->ai_addrlen, 3040 &(struct socklist){ 3041 .sl_socket = s, 3042 .sl_peer = pe, 3043 .sl_recv = sl_recv 3044 }); 3045 } 3046 freeaddrinfo(res0); 3047 3048 return(error); 3049 } 3050 3051 static void 3052 increase_rcvbuf(int fd) 3053 { 3054 socklen_t len; 3055 3056 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3057 &(socklen_t){sizeof(len)}) == 0) { 3058 if (len < RCVBUF_MINSIZE) { 3059 len = RCVBUF_MINSIZE; 3060 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3061 } 3062 } 3063 } 3064