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