1 /* 2 * Copyright (c) 1983, 1988, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * syslogd -- log system messages 47 * 48 * This program implements a system log. It takes a series of lines. 49 * Each line may have a priority, signified as "<n>" as 50 * the first characters of the line. If this is 51 * not present, a default priority is used. 52 * 53 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 54 * cause it to reread its configuration file. 55 * 56 * Defined Constants: 57 * 58 * MAXLINE -- the maximum line length that can be handled. 59 * DEFUPRI -- the default priority for user messages 60 * DEFSPRI -- the default priority for kernel messages 61 * 62 * Author: Eric Allman 63 * extensive changes by Ralph Campbell 64 * more extensive changes by Eric Allman (again) 65 * Extension to log by program name as well as facility and priority 66 * by Peter da Silva. 67 * -u and -v by Harlan Stenn. 68 * Priority comparison code by Harlan Stenn. 69 */ 70 71 #define MAXLINE 1024 /* maximum line length */ 72 #define MAXSVLINE MAXLINE /* maximum saved line length */ 73 #define DEFUPRI (LOG_USER|LOG_NOTICE) 74 #define DEFSPRI (LOG_KERN|LOG_CRIT) 75 #define TIMERINTVL 30 /* interval for checking flush, mark */ 76 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 77 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 78 79 #include <sys/param.h> 80 #include <sys/ioctl.h> 81 #include <sys/mman.h> 82 #include <sys/stat.h> 83 #include <sys/wait.h> 84 #include <sys/socket.h> 85 #include <sys/queue.h> 86 #include <sys/uio.h> 87 #include <sys/un.h> 88 #include <sys/time.h> 89 #include <sys/resource.h> 90 #include <sys/syslimits.h> 91 92 #include <netinet/in.h> 93 #include <netdb.h> 94 #include <arpa/inet.h> 95 96 #include <ctype.h> 97 #include <dirent.h> 98 #include <err.h> 99 #include <errno.h> 100 #include <fcntl.h> 101 #include <fnmatch.h> 102 #include <libutil.h> 103 #include <limits.h> 104 #include <paths.h> 105 #include <signal.h> 106 #include <stdio.h> 107 #include <stdlib.h> 108 #include <string.h> 109 #include <sysexits.h> 110 #include <unistd.h> 111 #include <utmpx.h> 112 113 #include "pathnames.h" 114 #include "ttymsg.h" 115 116 #define SYSLOG_NAMES 117 #include <sys/syslog.h> 118 119 static const char *ConfFile = _PATH_LOGCONF; 120 static const char *PidFile = _PATH_LOGPID; 121 static const char ctty[] = _PATH_CONSOLE; 122 static const char include_str[] = "include"; 123 static const char include_ext[] = ".conf"; 124 125 #define dprintf if (Debug) printf 126 127 #define MAXUNAMES 20 /* maximum number of user names */ 128 129 #define sstosa(ss) ((struct sockaddr *)(ss)) 130 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 131 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 132 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 133 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 134 #define s6_addr32 __u6_addr.__u6_addr32 135 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 136 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 137 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 138 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 139 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 140 /* 141 * List of peers and sockets for binding. 142 */ 143 struct peer { 144 const char *pe_name; 145 const char *pe_serv; 146 mode_t pe_mode; 147 STAILQ_ENTRY(peer) next; 148 }; 149 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 150 151 struct socklist { 152 struct sockaddr_storage sl_ss; 153 int sl_socket; 154 struct peer *sl_peer; 155 int (*sl_recv)(struct socklist *); 156 STAILQ_ENTRY(socklist) next; 157 }; 158 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 159 160 /* 161 * Flags to logmsg(). 162 */ 163 164 #define IGN_CONS 0x001 /* don't print on console */ 165 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 166 #define ADDDATE 0x004 /* add a date to the message */ 167 #define MARK 0x008 /* this message is a mark */ 168 #define ISKERNEL 0x010 /* kernel generated message */ 169 170 /* 171 * This structure represents the files that will have log 172 * copies printed. 173 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 174 * or if f_type if F_PIPE and f_pid > 0. 175 */ 176 177 struct filed { 178 STAILQ_ENTRY(filed) next; /* next in linked list */ 179 short f_type; /* entry type, see below */ 180 short f_file; /* file descriptor */ 181 time_t f_time; /* time this was last written */ 182 char *f_host; /* host from which to recd. */ 183 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 184 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 185 #define PRI_LT 0x1 186 #define PRI_EQ 0x2 187 #define PRI_GT 0x4 188 char *f_program; /* program this applies to */ 189 union { 190 char f_uname[MAXUNAMES][MAXLOGNAME]; 191 struct { 192 char f_hname[MAXHOSTNAMELEN]; 193 struct addrinfo *f_addr; 194 195 } f_forw; /* forwarding address */ 196 char f_fname[MAXPATHLEN]; 197 struct { 198 char f_pname[MAXPATHLEN]; 199 pid_t f_pid; 200 } f_pipe; 201 } f_un; 202 #define fu_uname f_un.f_uname 203 #define fu_forw_hname f_un.f_forw.f_hname 204 #define fu_forw_addr f_un.f_forw.f_addr 205 #define fu_fname f_un.f_fname 206 #define fu_pipe_pname f_un.f_pipe.f_pname 207 #define fu_pipe_pid f_un.f_pipe.f_pid 208 char f_prevline[MAXSVLINE]; /* last message logged */ 209 char f_lasttime[16]; /* time of last occurrence */ 210 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 211 int f_prevpri; /* pri of f_prevline */ 212 int f_prevlen; /* length of f_prevline */ 213 int f_prevcount; /* repetition cnt of prevline */ 214 u_int f_repeatcount; /* number of "repeated" msgs */ 215 int f_flags; /* file-specific flags */ 216 #define FFLAG_SYNC 0x01 217 #define FFLAG_NEEDSYNC 0x02 218 }; 219 220 /* 221 * Queue of about-to-be dead processes we should watch out for. 222 */ 223 struct deadq_entry { 224 pid_t dq_pid; 225 int dq_timeout; 226 TAILQ_ENTRY(deadq_entry) dq_entries; 227 }; 228 static TAILQ_HEAD(, deadq_entry) deadq_head = 229 TAILQ_HEAD_INITIALIZER(deadq_head); 230 231 /* 232 * The timeout to apply to processes waiting on the dead queue. Unit 233 * of measure is `mark intervals', i.e. 20 minutes by default. 234 * Processes on the dead queue will be terminated after that time. 235 */ 236 237 #define DQ_TIMO_INIT 2 238 239 /* 240 * Struct to hold records of network addresses that are allowed to log 241 * to us. 242 */ 243 struct allowedpeer { 244 int isnumeric; 245 u_short port; 246 union { 247 struct { 248 struct sockaddr_storage addr; 249 struct sockaddr_storage mask; 250 } numeric; 251 char *name; 252 } u; 253 #define a_addr u.numeric.addr 254 #define a_mask u.numeric.mask 255 #define a_name u.name 256 STAILQ_ENTRY(allowedpeer) next; 257 }; 258 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 259 260 261 /* 262 * Intervals at which we flush out "message repeated" messages, 263 * in seconds after previous message is logged. After each flush, 264 * we move to the next interval until we reach the largest. 265 */ 266 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 267 #define MAXREPEAT (nitems(repeatinterval) - 1) 268 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 269 #define BACKOFF(f) do { \ 270 if (++(f)->f_repeatcount > MAXREPEAT) \ 271 (f)->f_repeatcount = MAXREPEAT; \ 272 } while (0) 273 274 /* values for f_type */ 275 #define F_UNUSED 0 /* unused entry */ 276 #define F_FILE 1 /* regular file */ 277 #define F_TTY 2 /* terminal */ 278 #define F_CONSOLE 3 /* console terminal */ 279 #define F_FORW 4 /* remote machine */ 280 #define F_USERS 5 /* list of users */ 281 #define F_WALL 6 /* everyone logged on */ 282 #define F_PIPE 7 /* pipe to program */ 283 284 static const char *TypeNames[8] = { 285 "UNUSED", "FILE", "TTY", "CONSOLE", 286 "FORW", "USERS", "WALL", "PIPE" 287 }; 288 289 static STAILQ_HEAD(, filed) fhead = 290 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 291 static struct filed consfile; /* Console */ 292 293 static int Debug; /* debug flag */ 294 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 295 static int resolve = 1; /* resolve hostname */ 296 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 297 static const char *LocalDomain; /* our local domain name */ 298 static int Initialized; /* set when we have initialized ourselves */ 299 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 300 static int MarkSeq; /* mark sequence number */ 301 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 302 static int SecureMode; /* when true, receive only unix domain socks */ 303 #ifdef INET6 304 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 305 #else 306 static int family = PF_INET; /* protocol family (IPv4 only) */ 307 #endif 308 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 309 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 310 static int use_bootfile; /* log entire bootfile for every kern msg */ 311 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 312 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 313 314 static char bootfile[MAXLINE+1]; /* booted kernel file */ 315 316 static int RemoteAddDate; /* Always set the date on remote messages */ 317 318 static int UniquePriority; /* Only log specified priority? */ 319 static int LogFacPri; /* Put facility and priority in log message: */ 320 /* 0=no, 1=numeric, 2=names */ 321 static int KeepKernFac; /* Keep remotely logged kernel facility */ 322 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 323 static struct pidfh *pfh; 324 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 325 326 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 327 328 static int allowaddr(char *); 329 static int addfile(struct filed *); 330 static int addpeer(struct peer *); 331 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 332 static struct filed *cfline(const char *, const char *, const char *); 333 static const char *cvthname(struct sockaddr *); 334 static void deadq_enter(pid_t, const char *); 335 static int deadq_remove(struct deadq_entry *); 336 static int deadq_removebypid(pid_t); 337 static int decode(const char *, const CODE *); 338 static void die(int) __dead2; 339 static void dodie(int); 340 static void dofsync(void); 341 static void domark(int); 342 static void fprintlog(struct filed *, int, const char *); 343 static void init(int); 344 static void logerror(const char *); 345 static void logmsg(int, const char *, const char *, int); 346 static void log_deadchild(pid_t, int, const char *); 347 static void markit(void); 348 static int socksetup(struct peer *); 349 static int socklist_recv_file(struct socklist *); 350 static int socklist_recv_sock(struct socklist *); 351 static int socklist_recv_signal(struct socklist *); 352 static void sighandler(int); 353 static int skip_message(const char *, const char *, int); 354 static void printline(const char *, char *, int); 355 static void printsys(char *); 356 static int p_open(const char *, pid_t *); 357 static void reapchild(int); 358 static const char *ttymsg_check(struct iovec *, int, char *, int); 359 static void usage(void); 360 static int validate(struct sockaddr *, const char *); 361 static void unmapped(struct sockaddr *); 362 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 363 static int waitdaemon(int); 364 static void timedout(int); 365 static void increase_rcvbuf(int); 366 367 static void 368 close_filed(struct filed *f) 369 { 370 371 if (f == NULL || f->f_file == -1) 372 return; 373 374 switch (f->f_type) { 375 case F_FILE: 376 case F_TTY: 377 case F_CONSOLE: 378 case F_FORW: 379 f->f_type = F_UNUSED; 380 break; 381 case F_PIPE: 382 f->fu_pipe_pid = 0; 383 break; 384 } 385 (void)close(f->f_file); 386 f->f_file = -1; 387 } 388 389 static int 390 addfile(struct filed *f0) 391 { 392 struct filed *f; 393 394 f = calloc(1, sizeof(*f)); 395 if (f == NULL) 396 err(1, "malloc failed"); 397 *f = *f0; 398 STAILQ_INSERT_TAIL(&fhead, f, next); 399 400 return (0); 401 } 402 403 static int 404 addpeer(struct peer *pe0) 405 { 406 struct peer *pe; 407 408 pe = calloc(1, sizeof(*pe)); 409 if (pe == NULL) 410 err(1, "malloc failed"); 411 *pe = *pe0; 412 STAILQ_INSERT_TAIL(&pqueue, pe, next); 413 414 return (0); 415 } 416 417 static int 418 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 419 { 420 struct socklist *sl; 421 422 sl = calloc(1, sizeof(*sl)); 423 if (sl == NULL) 424 err(1, "malloc failed"); 425 *sl = *sl0; 426 if (sa != NULL && sa_len > 0) 427 memcpy(&sl->sl_ss, sa, sa_len); 428 STAILQ_INSERT_TAIL(&shead, sl, next); 429 430 return (0); 431 } 432 433 int 434 main(int argc, char *argv[]) 435 { 436 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 437 fd_set *fdsr = NULL; 438 struct timeval tv, *tvp; 439 struct peer *pe; 440 struct socklist *sl; 441 pid_t ppid = 1, spid; 442 char *p; 443 444 if (madvise(NULL, 0, MADV_PROTECT) != 0) 445 dprintf("madvise() failed: %s\n", strerror(errno)); 446 447 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:Fkl:m:nNop:P:sS:Tuv")) 448 != -1) 449 switch (ch) { 450 #ifdef INET 451 case '4': 452 family = PF_INET; 453 break; 454 #endif 455 #ifdef INET6 456 case '6': 457 family = PF_INET6; 458 break; 459 #endif 460 case '8': 461 mask_C1 = 0; 462 break; 463 case 'A': 464 send_to_all++; 465 break; 466 case 'a': /* allow specific network addresses only */ 467 if (allowaddr(optarg) == -1) 468 usage(); 469 break; 470 case 'b': 471 bflag = 1; 472 if ((p = strchr(optarg, ':')) == NULL) { 473 /* A hostname or filename only. */ 474 addpeer(&(struct peer){ 475 .pe_name = optarg, 476 .pe_serv = "syslog" 477 }); 478 } else { 479 /* The case of "name:service". */ 480 *p++ = '\0'; 481 addpeer(&(struct peer){ 482 .pe_serv = p, 483 .pe_name = (strlen(optarg) == 0) ? 484 NULL : optarg, 485 }); 486 } 487 break; 488 case 'c': 489 no_compress++; 490 break; 491 case 'C': 492 logflags |= O_CREAT; 493 break; 494 case 'd': /* debug */ 495 Debug++; 496 break; 497 case 'f': /* configuration file */ 498 ConfFile = optarg; 499 break; 500 case 'F': /* run in foreground instead of daemon */ 501 Foreground++; 502 break; 503 case 'k': /* keep remote kern fac */ 504 KeepKernFac = 1; 505 break; 506 case 'l': 507 case 'p': 508 case 'S': 509 { 510 long perml; 511 mode_t mode; 512 char *name, *ep; 513 514 if (ch == 'l') 515 mode = DEFFILEMODE; 516 else if (ch == 'p') { 517 mode = DEFFILEMODE; 518 pflag = 1; 519 } else if (ch == 'S') { 520 mode = S_IRUSR | S_IWUSR; 521 Sflag = 1; 522 } 523 if (optarg[0] == '/') 524 name = optarg; 525 else if ((name = strchr(optarg, ':')) != NULL) { 526 *name++ = '\0'; 527 if (name[0] != '/') 528 errx(1, "socket name must be absolute " 529 "path"); 530 if (isdigit(*optarg)) { 531 perml = strtol(optarg, &ep, 8); 532 if (*ep || perml < 0 || 533 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 534 errx(1, "invalid mode %s, exiting", 535 optarg); 536 mode = (mode_t )perml; 537 } else 538 errx(1, "invalid mode %s, exiting", 539 optarg); 540 } else 541 errx(1, "invalid filename %s, exiting", 542 optarg); 543 addpeer(&(struct peer){ 544 .pe_name = name, 545 .pe_mode = mode 546 }); 547 break; 548 } 549 case 'm': /* mark interval */ 550 MarkInterval = atoi(optarg) * 60; 551 break; 552 case 'N': 553 NoBind = 1; 554 SecureMode = 1; 555 break; 556 case 'n': 557 resolve = 0; 558 break; 559 case 'o': 560 use_bootfile = 1; 561 break; 562 case 'P': /* path for alt. PID */ 563 PidFile = optarg; 564 break; 565 case 's': /* no network mode */ 566 SecureMode++; 567 break; 568 case 'T': 569 RemoteAddDate = 1; 570 break; 571 case 'u': /* only log specified priority */ 572 UniquePriority++; 573 break; 574 case 'v': /* log facility and priority */ 575 LogFacPri++; 576 break; 577 default: 578 usage(); 579 } 580 if ((argc -= optind) != 0) 581 usage(); 582 583 /* Pipe to catch a signal during select(). */ 584 s = pipe2(sigpipe, O_CLOEXEC); 585 if (s < 0) { 586 err(1, "cannot open a pipe for signals"); 587 } else { 588 addsock(NULL, 0, &(struct socklist){ 589 .sl_socket = sigpipe[0], 590 .sl_recv = socklist_recv_signal 591 }); 592 } 593 594 /* Listen by default: /dev/klog. */ 595 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 596 if (s < 0) { 597 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 598 } else { 599 addsock(NULL, 0, &(struct socklist){ 600 .sl_socket = s, 601 .sl_recv = socklist_recv_file, 602 }); 603 } 604 /* Listen by default: *:514 if no -b flag. */ 605 if (bflag == 0) 606 addpeer(&(struct peer){ 607 .pe_serv = "syslog" 608 }); 609 /* Listen by default: /var/run/log if no -p flag. */ 610 if (pflag == 0) 611 addpeer(&(struct peer){ 612 .pe_name = _PATH_LOG, 613 .pe_mode = DEFFILEMODE, 614 }); 615 /* Listen by default: /var/run/logpriv if no -S flag. */ 616 if (Sflag == 0) 617 addpeer(&(struct peer){ 618 .pe_name = _PATH_LOG_PRIV, 619 .pe_mode = S_IRUSR | S_IWUSR, 620 }); 621 STAILQ_FOREACH(pe, &pqueue, next) 622 socksetup(pe); 623 624 pfh = pidfile_open(PidFile, 0600, &spid); 625 if (pfh == NULL) { 626 if (errno == EEXIST) 627 errx(1, "syslogd already running, pid: %d", spid); 628 warn("cannot open pid file"); 629 } 630 631 if ((!Foreground) && (!Debug)) { 632 ppid = waitdaemon(30); 633 if (ppid < 0) { 634 warn("could not become daemon"); 635 pidfile_remove(pfh); 636 exit(1); 637 } 638 } else if (Debug) 639 setlinebuf(stdout); 640 641 consfile.f_type = F_CONSOLE; 642 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 643 sizeof(consfile.fu_fname)); 644 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 645 (void)signal(SIGTERM, dodie); 646 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 647 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 648 (void)signal(SIGHUP, sighandler); 649 (void)signal(SIGCHLD, sighandler); 650 (void)signal(SIGALRM, domark); 651 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 652 (void)alarm(TIMERINTVL); 653 654 /* tuck my process id away */ 655 pidfile_write(pfh); 656 657 dprintf("off & running....\n"); 658 659 tvp = &tv; 660 tv.tv_sec = tv.tv_usec = 0; 661 662 STAILQ_FOREACH(sl, &shead, next) { 663 if (sl->sl_socket > fdsrmax) 664 fdsrmax = sl->sl_socket; 665 } 666 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 667 sizeof(fd_mask)); 668 if (fdsr == NULL) 669 errx(1, "calloc fd_set"); 670 671 for (;;) { 672 if (Initialized == 0) 673 init(0); 674 else if (WantInitialize) 675 init(WantInitialize); 676 if (WantReapchild) 677 reapchild(WantReapchild); 678 if (MarkSet) 679 markit(); 680 if (WantDie) 681 die(WantDie); 682 683 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 684 sizeof(fd_mask)); 685 686 STAILQ_FOREACH(sl, &shead, next) { 687 if (sl->sl_socket != -1) 688 FD_SET(sl->sl_socket, fdsr); 689 } 690 i = select(fdsrmax + 1, fdsr, NULL, NULL, 691 needdofsync ? &tv : tvp); 692 switch (i) { 693 case 0: 694 dofsync(); 695 needdofsync = 0; 696 if (tvp) { 697 tvp = NULL; 698 if (ppid != 1) 699 kill(ppid, SIGALRM); 700 } 701 continue; 702 case -1: 703 if (errno != EINTR) 704 logerror("select"); 705 continue; 706 } 707 STAILQ_FOREACH(sl, &shead, next) { 708 if (FD_ISSET(sl->sl_socket, fdsr)) 709 (*sl->sl_recv)(sl); 710 } 711 } 712 free(fdsr); 713 } 714 715 static int 716 socklist_recv_signal(struct socklist *sl __unused) 717 { 718 ssize_t len; 719 int i, nsig, signo; 720 721 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 722 logerror("ioctl(FIONREAD)"); 723 err(1, "signal pipe read failed"); 724 } 725 nsig = i / sizeof(signo); 726 dprintf("# of received signals = %d\n", nsig); 727 for (i = 0; i < nsig; i++) { 728 len = read(sigpipe[0], &signo, sizeof(signo)); 729 if (len != sizeof(signo)) { 730 logerror("signal pipe read failed"); 731 err(1, "signal pipe read failed"); 732 } 733 dprintf("Received signal: %d from fd=%d\n", signo, 734 sigpipe[0]); 735 switch (signo) { 736 case SIGHUP: 737 WantInitialize = 1; 738 break; 739 case SIGCHLD: 740 WantReapchild = 1; 741 break; 742 } 743 } 744 return (0); 745 } 746 747 static int 748 socklist_recv_sock(struct socklist *sl) 749 { 750 struct sockaddr_storage ss; 751 struct sockaddr *sa = (struct sockaddr *)&ss; 752 socklen_t sslen; 753 const char *hname; 754 char line[MAXLINE + 1]; 755 int date, len; 756 757 sslen = sizeof(ss); 758 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 759 dprintf("received sa_len = %d\n", sslen); 760 if (len == 0) 761 return (-1); 762 if (len < 0) { 763 if (errno != EINTR) 764 logerror("recvfrom"); 765 return (-1); 766 } 767 /* Received valid data. */ 768 line[len] = '\0'; 769 if (sl->sl_ss.ss_family == AF_LOCAL) { 770 hname = LocalHostName; 771 date = 0; 772 } else { 773 hname = cvthname(sa); 774 unmapped(sa); 775 if (validate(sa, hname) == 0) 776 hname = NULL; 777 date = RemoteAddDate ? ADDDATE : 0; 778 } 779 if (hname != NULL) 780 printline(hname, line, date); 781 else 782 dprintf("Invalid msg from %s was ignored.", hname); 783 784 return (0); 785 } 786 787 static void 788 unmapped(struct sockaddr *sa) 789 { 790 #if defined(INET) && defined(INET6) 791 struct sockaddr_in6 *sin6; 792 struct sockaddr_in sin; 793 794 if (sa == NULL || 795 sa->sa_family != AF_INET6 || 796 sa->sa_len != sizeof(*sin6)) 797 return; 798 sin6 = satosin6(sa); 799 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 800 return; 801 sin = (struct sockaddr_in){ 802 .sin_family = AF_INET, 803 .sin_len = sizeof(sin), 804 .sin_port = sin6->sin6_port 805 }; 806 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 807 sizeof(sin.sin_addr)); 808 memcpy(sa, &sin, sizeof(sin)); 809 #else 810 if (sa == NULL) 811 return; 812 #endif 813 } 814 815 static void 816 usage(void) 817 { 818 819 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 820 "usage: syslogd [-468ACcdFknosTuv] [-a allowed_peer]", 821 " [-b bind_address] [-f config_file]", 822 " [-l [mode:]path] [-m mark_interval]", 823 " [-P pid_file] [-p log_socket]", 824 " [-S logpriv_socket]"); 825 exit(1); 826 } 827 828 /* 829 * Take a raw input line, decode the message, and print the message 830 * on the appropriate log files. 831 */ 832 static void 833 printline(const char *hname, char *msg, int flags) 834 { 835 char *p, *q; 836 long n; 837 int c, pri; 838 char line[MAXLINE + 1]; 839 840 /* test for special codes */ 841 p = msg; 842 pri = DEFUPRI; 843 if (*p == '<') { 844 errno = 0; 845 n = strtol(p + 1, &q, 10); 846 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 847 p = q + 1; 848 pri = n; 849 } 850 } 851 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 852 pri = DEFUPRI; 853 854 /* 855 * Don't allow users to log kernel messages. 856 * NOTE: since LOG_KERN == 0 this will also match 857 * messages with no facility specified. 858 */ 859 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 860 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 861 862 q = line; 863 864 while ((c = (unsigned char)*p++) != '\0' && 865 q < &line[sizeof(line) - 4]) { 866 if (mask_C1 && (c & 0x80) && c < 0xA0) { 867 c &= 0x7F; 868 *q++ = 'M'; 869 *q++ = '-'; 870 } 871 if (isascii(c) && iscntrl(c)) { 872 if (c == '\n') { 873 *q++ = ' '; 874 } else if (c == '\t') { 875 *q++ = '\t'; 876 } else { 877 *q++ = '^'; 878 *q++ = c ^ 0100; 879 } 880 } else { 881 *q++ = c; 882 } 883 } 884 *q = '\0'; 885 886 logmsg(pri, line, hname, flags); 887 } 888 889 /* 890 * Read /dev/klog while data are available, split into lines. 891 */ 892 static int 893 socklist_recv_file(struct socklist *sl) 894 { 895 char *p, *q, line[MAXLINE + 1]; 896 int len, i; 897 898 len = 0; 899 for (;;) { 900 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 901 if (i > 0) { 902 line[i + len] = '\0'; 903 } else { 904 if (i < 0 && errno != EINTR && errno != EAGAIN) { 905 logerror("klog"); 906 close(sl->sl_socket); 907 sl->sl_socket = -1; 908 } 909 break; 910 } 911 912 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 913 *q = '\0'; 914 printsys(p); 915 } 916 len = strlen(p); 917 if (len >= MAXLINE - 1) { 918 printsys(p); 919 len = 0; 920 } 921 if (len > 0) 922 memmove(line, p, len + 1); 923 } 924 if (len > 0) 925 printsys(line); 926 927 return (len); 928 } 929 930 /* 931 * Take a raw input line from /dev/klog, format similar to syslog(). 932 */ 933 static void 934 printsys(char *msg) 935 { 936 char *p, *q; 937 long n; 938 int flags, isprintf, pri; 939 940 flags = ISKERNEL | SYNC_FILE | ADDDATE; /* fsync after write */ 941 p = msg; 942 pri = DEFSPRI; 943 isprintf = 1; 944 if (*p == '<') { 945 errno = 0; 946 n = strtol(p + 1, &q, 10); 947 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 948 p = q + 1; 949 pri = n; 950 isprintf = 0; 951 } 952 } 953 /* 954 * Kernel printf's and LOG_CONSOLE messages have been displayed 955 * on the console already. 956 */ 957 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 958 flags |= IGN_CONS; 959 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 960 pri = DEFSPRI; 961 logmsg(pri, p, LocalHostName, flags); 962 } 963 964 static time_t now; 965 966 /* 967 * Match a program or host name against a specification. 968 * Return a non-0 value if the message must be ignored 969 * based on the specification. 970 */ 971 static int 972 skip_message(const char *name, const char *spec, int checkcase) 973 { 974 const char *s; 975 char prev, next; 976 int exclude = 0; 977 /* Behaviour on explicit match */ 978 979 if (spec == NULL) 980 return 0; 981 switch (*spec) { 982 case '-': 983 exclude = 1; 984 /*FALLTHROUGH*/ 985 case '+': 986 spec++; 987 break; 988 default: 989 break; 990 } 991 if (checkcase) 992 s = strstr (spec, name); 993 else 994 s = strcasestr (spec, name); 995 996 if (s != NULL) { 997 prev = (s == spec ? ',' : *(s - 1)); 998 next = *(s + strlen (name)); 999 1000 if (prev == ',' && (next == '\0' || next == ',')) 1001 /* Explicit match: skip iff the spec is an 1002 exclusive one. */ 1003 return exclude; 1004 } 1005 1006 /* No explicit match for this name: skip the message iff 1007 the spec is an inclusive one. */ 1008 return !exclude; 1009 } 1010 1011 /* 1012 * Log a message to the appropriate log files, users, etc. based on 1013 * the priority. 1014 */ 1015 static void 1016 logmsg(int pri, const char *msg, const char *from, int flags) 1017 { 1018 struct filed *f; 1019 int i, fac, msglen, prilev; 1020 const char *timestamp; 1021 char prog[NAME_MAX+1]; 1022 char buf[MAXLINE+1]; 1023 1024 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1025 pri, flags, from, msg); 1026 1027 /* 1028 * Check to see if msg looks non-standard. 1029 */ 1030 msglen = strlen(msg); 1031 if (msglen < 16 || msg[3] != ' ' || msg[6] != ' ' || 1032 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') 1033 flags |= ADDDATE; 1034 1035 (void)time(&now); 1036 if (flags & ADDDATE) { 1037 timestamp = ctime(&now) + 4; 1038 } else { 1039 timestamp = msg; 1040 msg += 16; 1041 msglen -= 16; 1042 } 1043 1044 /* skip leading blanks */ 1045 while (isspace(*msg)) { 1046 msg++; 1047 msglen--; 1048 } 1049 1050 /* extract facility and priority level */ 1051 if (flags & MARK) 1052 fac = LOG_NFACILITIES; 1053 else 1054 fac = LOG_FAC(pri); 1055 1056 /* Check maximum facility number. */ 1057 if (fac > LOG_NFACILITIES) 1058 return; 1059 1060 prilev = LOG_PRI(pri); 1061 1062 /* extract program name */ 1063 for (i = 0; i < NAME_MAX; i++) { 1064 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1065 msg[i] == '/' || isspace(msg[i])) 1066 break; 1067 prog[i] = msg[i]; 1068 } 1069 prog[i] = 0; 1070 1071 /* add kernel prefix for kernel messages */ 1072 if (flags & ISKERNEL) { 1073 snprintf(buf, sizeof(buf), "%s: %s", 1074 use_bootfile ? bootfile : "kernel", msg); 1075 msg = buf; 1076 msglen = strlen(buf); 1077 } 1078 1079 /* log the message to the particular outputs */ 1080 if (!Initialized) { 1081 f = &consfile; 1082 /* 1083 * Open in non-blocking mode to avoid hangs during open 1084 * and close(waiting for the port to drain). 1085 */ 1086 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1087 1088 if (f->f_file >= 0) { 1089 (void)strlcpy(f->f_lasttime, timestamp, 1090 sizeof(f->f_lasttime)); 1091 fprintlog(f, flags, msg); 1092 close(f->f_file); 1093 f->f_file = -1; 1094 } 1095 return; 1096 } 1097 STAILQ_FOREACH(f, &fhead, next) { 1098 /* skip messages that are incorrect priority */ 1099 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1100 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1101 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1102 ) 1103 || f->f_pmask[fac] == INTERNAL_NOPRI) 1104 continue; 1105 1106 /* skip messages with the incorrect hostname */ 1107 if (skip_message(from, f->f_host, 0)) 1108 continue; 1109 1110 /* skip messages with the incorrect program name */ 1111 if (skip_message(prog, f->f_program, 1)) 1112 continue; 1113 1114 /* skip message to console if it has already been printed */ 1115 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1116 continue; 1117 1118 /* don't output marks to recently written files */ 1119 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1120 continue; 1121 1122 /* 1123 * suppress duplicate lines to this file 1124 */ 1125 if (no_compress - (f->f_type != F_PIPE) < 1 && 1126 (flags & MARK) == 0 && msglen == f->f_prevlen && 1127 !strcmp(msg, f->f_prevline) && 1128 !strcasecmp(from, f->f_prevhost)) { 1129 (void)strlcpy(f->f_lasttime, timestamp, 1130 sizeof(f->f_lasttime)); 1131 f->f_prevcount++; 1132 dprintf("msg repeated %d times, %ld sec of %d\n", 1133 f->f_prevcount, (long)(now - f->f_time), 1134 repeatinterval[f->f_repeatcount]); 1135 /* 1136 * If domark would have logged this by now, 1137 * flush it now (so we don't hold isolated messages), 1138 * but back off so we'll flush less often 1139 * in the future. 1140 */ 1141 if (now > REPEATTIME(f)) { 1142 fprintlog(f, flags, (char *)NULL); 1143 BACKOFF(f); 1144 } 1145 } else { 1146 /* new line, save it */ 1147 if (f->f_prevcount) 1148 fprintlog(f, 0, (char *)NULL); 1149 f->f_repeatcount = 0; 1150 f->f_prevpri = pri; 1151 (void)strlcpy(f->f_lasttime, timestamp, 1152 sizeof(f->f_lasttime)); 1153 (void)strlcpy(f->f_prevhost, from, 1154 sizeof(f->f_prevhost)); 1155 if (msglen < MAXSVLINE) { 1156 f->f_prevlen = msglen; 1157 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1158 fprintlog(f, flags, (char *)NULL); 1159 } else { 1160 f->f_prevline[0] = 0; 1161 f->f_prevlen = 0; 1162 fprintlog(f, flags, msg); 1163 } 1164 } 1165 } 1166 } 1167 1168 static void 1169 dofsync(void) 1170 { 1171 struct filed *f; 1172 1173 STAILQ_FOREACH(f, &fhead, next) { 1174 if ((f->f_type == F_FILE) && 1175 (f->f_flags & FFLAG_NEEDSYNC)) { 1176 f->f_flags &= ~FFLAG_NEEDSYNC; 1177 (void)fsync(f->f_file); 1178 } 1179 } 1180 } 1181 1182 #define IOV_SIZE 7 1183 static void 1184 fprintlog(struct filed *f, int flags, const char *msg) 1185 { 1186 struct iovec iov[IOV_SIZE]; 1187 struct addrinfo *r; 1188 int l, lsent = 0; 1189 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1190 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1191 const char *msgret; 1192 1193 if (f->f_type == F_WALL) { 1194 /* The time displayed is not synchornized with the other log 1195 * destinations (like messages). Following fragment was using 1196 * ctime(&now), which was updating the time every 30 sec. 1197 * With f_lasttime, time is synchronized correctly. 1198 */ 1199 iov[0] = (struct iovec){ 1200 .iov_base = greetings, 1201 .iov_len = snprintf(greetings, sizeof(greetings), 1202 "\r\n\7Message from syslogd@%s " 1203 "at %.24s ...\r\n", 1204 f->f_prevhost, f->f_lasttime) 1205 }; 1206 if (iov[0].iov_len >= sizeof(greetings)) 1207 iov[0].iov_len = sizeof(greetings) - 1; 1208 iov[1] = (struct iovec){ 1209 .iov_base = nul, 1210 .iov_len = 0 1211 }; 1212 } else { 1213 iov[0] = (struct iovec){ 1214 .iov_base = f->f_lasttime, 1215 .iov_len = strlen(f->f_lasttime) 1216 }; 1217 iov[1] = (struct iovec){ 1218 .iov_base = space, 1219 .iov_len = 1 1220 }; 1221 } 1222 1223 if (LogFacPri) { 1224 static char fp_buf[30]; /* Hollow laugh */ 1225 int fac = f->f_prevpri & LOG_FACMASK; 1226 int pri = LOG_PRI(f->f_prevpri); 1227 const char *f_s = NULL; 1228 char f_n[5]; /* Hollow laugh */ 1229 const char *p_s = NULL; 1230 char p_n[5]; /* Hollow laugh */ 1231 1232 if (LogFacPri > 1) { 1233 const CODE *c; 1234 1235 for (c = facilitynames; c->c_name; c++) { 1236 if (c->c_val == fac) { 1237 f_s = c->c_name; 1238 break; 1239 } 1240 } 1241 for (c = prioritynames; c->c_name; c++) { 1242 if (c->c_val == pri) { 1243 p_s = c->c_name; 1244 break; 1245 } 1246 } 1247 } 1248 if (!f_s) { 1249 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1250 f_s = f_n; 1251 } 1252 if (!p_s) { 1253 snprintf(p_n, sizeof p_n, "%d", pri); 1254 p_s = p_n; 1255 } 1256 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1257 iov[2] = (struct iovec){ 1258 .iov_base = fp_buf, 1259 .iov_len = strlen(fp_buf) 1260 }; 1261 } else { 1262 iov[2] = (struct iovec){ 1263 .iov_base = nul, 1264 .iov_len = 0 1265 }; 1266 } 1267 iov[3] = (struct iovec){ 1268 .iov_base = f->f_prevhost, 1269 .iov_len = strlen(f->f_prevhost) 1270 }; 1271 iov[4] = (struct iovec){ 1272 .iov_base = space, 1273 .iov_len = 1 1274 }; 1275 if (msg) { 1276 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1277 if (wmsg == NULL) { 1278 logerror("strdup"); 1279 exit(1); 1280 } 1281 iov[5] = (struct iovec){ 1282 .iov_base = wmsg, 1283 .iov_len = strlen(msg) 1284 }; 1285 } else if (f->f_prevcount > 1) { 1286 iov[5] = (struct iovec){ 1287 .iov_base = repbuf, 1288 .iov_len = snprintf(repbuf, sizeof(repbuf), 1289 "last message repeated %d times", f->f_prevcount) 1290 }; 1291 } else { 1292 iov[5] = (struct iovec){ 1293 .iov_base = f->f_prevline, 1294 .iov_len = f->f_prevlen 1295 }; 1296 } 1297 dprintf("Logging to %s", TypeNames[f->f_type]); 1298 f->f_time = now; 1299 1300 switch (f->f_type) { 1301 case F_UNUSED: 1302 dprintf("\n"); 1303 break; 1304 1305 case F_FORW: 1306 dprintf(" %s", f->fu_forw_hname); 1307 switch (f->fu_forw_addr->ai_addr->sa_family) { 1308 case AF_INET: 1309 dprintf(":%d\n", 1310 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1311 break; 1312 #ifdef INET6 1313 case AF_INET6: 1314 dprintf(":%d\n", 1315 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1316 break; 1317 #endif 1318 default: 1319 dprintf("\n"); 1320 } 1321 /* check for local vs remote messages */ 1322 if (strcasecmp(f->f_prevhost, LocalHostName)) 1323 l = snprintf(line, sizeof line - 1, 1324 "<%d>%.15s Forwarded from %s: %s", 1325 f->f_prevpri, (char *)iov[0].iov_base, 1326 f->f_prevhost, (char *)iov[5].iov_base); 1327 else 1328 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1329 f->f_prevpri, (char *)iov[0].iov_base, 1330 (char *)iov[5].iov_base); 1331 if (l < 0) 1332 l = 0; 1333 else if (l > MAXLINE) 1334 l = MAXLINE; 1335 1336 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1337 struct socklist *sl; 1338 1339 STAILQ_FOREACH(sl, &shead, next) { 1340 if (sl->sl_ss.ss_family == AF_LOCAL || 1341 sl->sl_ss.ss_family == AF_UNSPEC || 1342 sl->sl_socket < 0) 1343 continue; 1344 lsent = sendto(sl->sl_socket, line, l, 0, 1345 r->ai_addr, r->ai_addrlen); 1346 if (lsent == l) 1347 break; 1348 } 1349 if (lsent == l && !send_to_all) 1350 break; 1351 } 1352 dprintf("lsent/l: %d/%d\n", lsent, l); 1353 if (lsent != l) { 1354 int e = errno; 1355 logerror("sendto"); 1356 errno = e; 1357 switch (errno) { 1358 case ENOBUFS: 1359 case ENETDOWN: 1360 case ENETUNREACH: 1361 case EHOSTUNREACH: 1362 case EHOSTDOWN: 1363 case EADDRNOTAVAIL: 1364 break; 1365 /* case EBADF: */ 1366 /* case EACCES: */ 1367 /* case ENOTSOCK: */ 1368 /* case EFAULT: */ 1369 /* case EMSGSIZE: */ 1370 /* case EAGAIN: */ 1371 /* case ENOBUFS: */ 1372 /* case ECONNREFUSED: */ 1373 default: 1374 dprintf("removing entry: errno=%d\n", e); 1375 f->f_type = F_UNUSED; 1376 break; 1377 } 1378 } 1379 break; 1380 1381 case F_FILE: 1382 dprintf(" %s\n", f->fu_fname); 1383 iov[6] = (struct iovec){ 1384 .iov_base = lf, 1385 .iov_len = 1 1386 }; 1387 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1388 /* 1389 * If writev(2) fails for potentially transient errors 1390 * like the filesystem being full, ignore it. 1391 * Otherwise remove this logfile from the list. 1392 */ 1393 if (errno != ENOSPC) { 1394 int e = errno; 1395 close_filed(f); 1396 errno = e; 1397 logerror(f->fu_fname); 1398 } 1399 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1400 f->f_flags |= FFLAG_NEEDSYNC; 1401 needdofsync = 1; 1402 } 1403 break; 1404 1405 case F_PIPE: 1406 dprintf(" %s\n", f->fu_pipe_pname); 1407 iov[6] = (struct iovec){ 1408 .iov_base = lf, 1409 .iov_len = 1 1410 }; 1411 if (f->fu_pipe_pid == 0) { 1412 if ((f->f_file = p_open(f->fu_pipe_pname, 1413 &f->fu_pipe_pid)) < 0) { 1414 logerror(f->fu_pipe_pname); 1415 break; 1416 } 1417 } 1418 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1419 int e = errno; 1420 1421 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1422 close_filed(f); 1423 errno = e; 1424 logerror(f->fu_pipe_pname); 1425 } 1426 break; 1427 1428 case F_CONSOLE: 1429 if (flags & IGN_CONS) { 1430 dprintf(" (ignored)\n"); 1431 break; 1432 } 1433 /* FALLTHROUGH */ 1434 1435 case F_TTY: 1436 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1437 iov[6] = (struct iovec){ 1438 .iov_base = crlf, 1439 .iov_len = 2 1440 }; 1441 errno = 0; /* ttymsg() only sometimes returns an errno */ 1442 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1443 f->f_type = F_UNUSED; 1444 logerror(msgret); 1445 } 1446 break; 1447 1448 case F_USERS: 1449 case F_WALL: 1450 dprintf("\n"); 1451 iov[6] = (struct iovec){ 1452 .iov_base = crlf, 1453 .iov_len = 2 1454 }; 1455 wallmsg(f, iov, nitems(iov)); 1456 break; 1457 } 1458 f->f_prevcount = 0; 1459 free(wmsg); 1460 } 1461 1462 /* 1463 * WALLMSG -- Write a message to the world at large 1464 * 1465 * Write the specified message to either the entire 1466 * world, or a list of approved users. 1467 */ 1468 static void 1469 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1470 { 1471 static int reenter; /* avoid calling ourselves */ 1472 struct utmpx *ut; 1473 int i; 1474 const char *p; 1475 1476 if (reenter++) 1477 return; 1478 setutxent(); 1479 /* NOSTRICT */ 1480 while ((ut = getutxent()) != NULL) { 1481 if (ut->ut_type != USER_PROCESS) 1482 continue; 1483 if (f->f_type == F_WALL) { 1484 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1485 TTYMSGTIME)) != NULL) { 1486 errno = 0; /* already in msg */ 1487 logerror(p); 1488 } 1489 continue; 1490 } 1491 /* should we send the message to this user? */ 1492 for (i = 0; i < MAXUNAMES; i++) { 1493 if (!f->fu_uname[i][0]) 1494 break; 1495 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1496 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1497 TTYMSGTIME)) != NULL) { 1498 errno = 0; /* already in msg */ 1499 logerror(p); 1500 } 1501 break; 1502 } 1503 } 1504 } 1505 endutxent(); 1506 reenter = 0; 1507 } 1508 1509 /* 1510 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1511 */ 1512 static const char * 1513 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1514 { 1515 static char device[1024]; 1516 static char errbuf[1024]; 1517 struct stat sb; 1518 1519 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1520 1521 if (stat(device, &sb) < 0) { 1522 (void) snprintf(errbuf, sizeof(errbuf), 1523 "%s: %s", device, strerror(errno)); 1524 return (errbuf); 1525 } 1526 if ((sb.st_mode & S_IWGRP) == 0) 1527 /* Messages disabled. */ 1528 return (NULL); 1529 return ttymsg(iov, iovcnt, line, tmout); 1530 } 1531 1532 static void 1533 reapchild(int signo __unused) 1534 { 1535 int status; 1536 pid_t pid; 1537 struct filed *f; 1538 1539 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1540 /* First, look if it's a process from the dead queue. */ 1541 if (deadq_removebypid(pid)) 1542 continue; 1543 1544 /* Now, look in list of active processes. */ 1545 STAILQ_FOREACH(f, &fhead, next) { 1546 if (f->f_type == F_PIPE && 1547 f->fu_pipe_pid == pid) { 1548 close_filed(f); 1549 log_deadchild(pid, status, f->fu_pipe_pname); 1550 break; 1551 } 1552 } 1553 } 1554 WantReapchild = 0; 1555 } 1556 1557 /* 1558 * Return a printable representation of a host address. 1559 */ 1560 static const char * 1561 cvthname(struct sockaddr *f) 1562 { 1563 int error, hl; 1564 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1565 1566 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1567 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1568 NI_NUMERICHOST); 1569 if (error) { 1570 dprintf("Malformed from address %s\n", gai_strerror(error)); 1571 return ("???"); 1572 } 1573 dprintf("cvthname(%s)\n", ip); 1574 1575 if (!resolve) 1576 return (ip); 1577 1578 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1579 NULL, 0, NI_NAMEREQD); 1580 if (error) { 1581 dprintf("Host name for your address (%s) unknown\n", ip); 1582 return (ip); 1583 } 1584 hl = strlen(hname); 1585 if (hl > 0 && hname[hl-1] == '.') 1586 hname[--hl] = '\0'; 1587 trimdomain(hname, hl); 1588 return (hname); 1589 } 1590 1591 static void 1592 dodie(int signo) 1593 { 1594 1595 WantDie = signo; 1596 } 1597 1598 static void 1599 domark(int signo __unused) 1600 { 1601 1602 MarkSet = 1; 1603 } 1604 1605 /* 1606 * Print syslogd errors some place. 1607 */ 1608 static void 1609 logerror(const char *type) 1610 { 1611 char buf[512]; 1612 static int recursed = 0; 1613 1614 /* If there's an error while trying to log an error, give up. */ 1615 if (recursed) 1616 return; 1617 recursed++; 1618 if (errno) 1619 (void)snprintf(buf, 1620 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1621 else 1622 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1623 errno = 0; 1624 dprintf("%s\n", buf); 1625 logmsg(LOG_SYSLOG|LOG_ERR, buf, LocalHostName, ADDDATE); 1626 recursed--; 1627 } 1628 1629 static void 1630 die(int signo) 1631 { 1632 struct filed *f; 1633 struct socklist *sl; 1634 char buf[100]; 1635 1636 STAILQ_FOREACH(f, &fhead, next) { 1637 /* flush any pending output */ 1638 if (f->f_prevcount) 1639 fprintlog(f, 0, (char *)NULL); 1640 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 1641 close_filed(f); 1642 } 1643 if (signo) { 1644 dprintf("syslogd: exiting on signal %d\n", signo); 1645 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1646 errno = 0; 1647 logerror(buf); 1648 } 1649 STAILQ_FOREACH(sl, &shead, next) { 1650 if (sl->sl_ss.ss_family == AF_LOCAL) 1651 unlink(sl->sl_peer->pe_name); 1652 } 1653 pidfile_remove(pfh); 1654 1655 exit(1); 1656 } 1657 1658 static int 1659 configfiles(const struct dirent *dp) 1660 { 1661 const char *p; 1662 size_t ext_len; 1663 1664 if (dp->d_name[0] == '.') 1665 return (0); 1666 1667 ext_len = sizeof(include_ext) -1; 1668 1669 if (dp->d_namlen <= ext_len) 1670 return (0); 1671 1672 p = &dp->d_name[dp->d_namlen - ext_len]; 1673 if (strcmp(p, include_ext) != 0) 1674 return (0); 1675 1676 return (1); 1677 } 1678 1679 static void 1680 readconfigfile(FILE *cf, int allow_includes) 1681 { 1682 FILE *cf2; 1683 struct filed *f; 1684 struct dirent **ent; 1685 char cline[LINE_MAX]; 1686 char host[MAXHOSTNAMELEN]; 1687 char prog[LINE_MAX]; 1688 char file[MAXPATHLEN]; 1689 char *p, *tmp; 1690 int i, nents; 1691 size_t include_len; 1692 1693 /* 1694 * Foreach line in the conf table, open that file. 1695 */ 1696 include_len = sizeof(include_str) -1; 1697 (void)strlcpy(host, "*", sizeof(host)); 1698 (void)strlcpy(prog, "*", sizeof(prog)); 1699 while (fgets(cline, sizeof(cline), cf) != NULL) { 1700 /* 1701 * check for end-of-section, comments, strip off trailing 1702 * spaces and newline character. #!prog is treated specially: 1703 * following lines apply only to that program. 1704 */ 1705 for (p = cline; isspace(*p); ++p) 1706 continue; 1707 if (*p == 0) 1708 continue; 1709 if (allow_includes && 1710 strncmp(p, include_str, include_len) == 0 && 1711 isspace(p[include_len])) { 1712 p += include_len; 1713 while (isspace(*p)) 1714 p++; 1715 tmp = p; 1716 while (*tmp != '\0' && !isspace(*tmp)) 1717 tmp++; 1718 *tmp = '\0'; 1719 dprintf("Trying to include files in '%s'\n", p); 1720 nents = scandir(p, &ent, configfiles, alphasort); 1721 if (nents == -1) { 1722 dprintf("Unable to open '%s': %s\n", p, 1723 strerror(errno)); 1724 continue; 1725 } 1726 for (i = 0; i < nents; i++) { 1727 if (snprintf(file, sizeof(file), "%s/%s", p, 1728 ent[i]->d_name) >= (int)sizeof(file)) { 1729 dprintf("ignoring path too long: " 1730 "'%s/%s'\n", p, ent[i]->d_name); 1731 free(ent[i]); 1732 continue; 1733 } 1734 free(ent[i]); 1735 cf2 = fopen(file, "r"); 1736 if (cf2 == NULL) 1737 continue; 1738 dprintf("reading %s\n", file); 1739 readconfigfile(cf2, 0); 1740 fclose(cf2); 1741 } 1742 free(ent); 1743 continue; 1744 } 1745 if (*p == '#') { 1746 p++; 1747 if (*p != '!' && *p != '+' && *p != '-') 1748 continue; 1749 } 1750 if (*p == '+' || *p == '-') { 1751 host[0] = *p++; 1752 while (isspace(*p)) 1753 p++; 1754 if ((!*p) || (*p == '*')) { 1755 (void)strlcpy(host, "*", sizeof(host)); 1756 continue; 1757 } 1758 if (*p == '@') 1759 p = LocalHostName; 1760 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1761 if (!isalnum(*p) && *p != '.' && *p != '-' 1762 && *p != ',' && *p != ':' && *p != '%') 1763 break; 1764 host[i] = *p++; 1765 } 1766 host[i] = '\0'; 1767 continue; 1768 } 1769 if (*p == '!') { 1770 p++; 1771 while (isspace(*p)) p++; 1772 if ((!*p) || (*p == '*')) { 1773 (void)strlcpy(prog, "*", sizeof(prog)); 1774 continue; 1775 } 1776 for (i = 0; i < LINE_MAX - 1; i++) { 1777 if (!isprint(p[i]) || isspace(p[i])) 1778 break; 1779 prog[i] = p[i]; 1780 } 1781 prog[i] = 0; 1782 continue; 1783 } 1784 for (p = cline + 1; *p != '\0'; p++) { 1785 if (*p != '#') 1786 continue; 1787 if (*(p - 1) == '\\') { 1788 strcpy(p - 1, p); 1789 p--; 1790 continue; 1791 } 1792 *p = '\0'; 1793 break; 1794 } 1795 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1796 cline[i] = '\0'; 1797 f = cfline(cline, prog, host); 1798 if (f != NULL) 1799 addfile(f); 1800 } 1801 } 1802 1803 static void 1804 sighandler(int signo) 1805 { 1806 1807 /* Send an wake-up signal to the select() loop. */ 1808 write(sigpipe[1], &signo, sizeof(signo)); 1809 } 1810 1811 /* 1812 * INIT -- Initialize syslogd from configuration table 1813 */ 1814 static void 1815 init(int signo) 1816 { 1817 int i; 1818 FILE *cf; 1819 struct filed *f; 1820 char *p; 1821 char oldLocalHostName[MAXHOSTNAMELEN]; 1822 char hostMsg[2*MAXHOSTNAMELEN+40]; 1823 char bootfileMsg[LINE_MAX]; 1824 1825 dprintf("init\n"); 1826 WantInitialize = 0; 1827 1828 /* 1829 * Load hostname (may have changed). 1830 */ 1831 if (signo != 0) 1832 (void)strlcpy(oldLocalHostName, LocalHostName, 1833 sizeof(oldLocalHostName)); 1834 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1835 err(EX_OSERR, "gethostname() failed"); 1836 if ((p = strchr(LocalHostName, '.')) != NULL) { 1837 *p++ = '\0'; 1838 LocalDomain = p; 1839 } else { 1840 LocalDomain = ""; 1841 } 1842 1843 /* 1844 * Load / reload timezone data (in case it changed). 1845 * 1846 * Just calling tzset() again does not work, the timezone code 1847 * caches the result. However, by setting the TZ variable, one 1848 * can defeat the caching and have the timezone code really 1849 * reload the timezone data. Respect any initial setting of 1850 * TZ, in case the system is configured specially. 1851 */ 1852 dprintf("loading timezone data via tzset()\n"); 1853 if (getenv("TZ")) { 1854 tzset(); 1855 } else { 1856 setenv("TZ", ":/etc/localtime", 1); 1857 tzset(); 1858 unsetenv("TZ"); 1859 } 1860 1861 /* 1862 * Close all open log files. 1863 */ 1864 Initialized = 0; 1865 STAILQ_FOREACH(f, &fhead, next) { 1866 /* flush any pending output */ 1867 if (f->f_prevcount) 1868 fprintlog(f, 0, (char *)NULL); 1869 1870 switch (f->f_type) { 1871 case F_FILE: 1872 case F_FORW: 1873 case F_CONSOLE: 1874 case F_TTY: 1875 close_filed(f); 1876 break; 1877 case F_PIPE: 1878 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1879 close_filed(f); 1880 break; 1881 } 1882 } 1883 while(!STAILQ_EMPTY(&fhead)) { 1884 f = STAILQ_FIRST(&fhead); 1885 STAILQ_REMOVE_HEAD(&fhead, next); 1886 free(f->f_program); 1887 free(f->f_host); 1888 free(f); 1889 } 1890 1891 /* open the configuration file */ 1892 if ((cf = fopen(ConfFile, "r")) == NULL) { 1893 dprintf("cannot open %s\n", ConfFile); 1894 f = cfline("*.ERR\t/dev/console", "*", "*"); 1895 if (f != NULL) 1896 addfile(f); 1897 f = cfline("*.PANIC\t*", "*", "*"); 1898 if (f != NULL) 1899 addfile(f); 1900 Initialized = 1; 1901 1902 return; 1903 } 1904 1905 readconfigfile(cf, 1); 1906 1907 /* close the configuration file */ 1908 (void)fclose(cf); 1909 1910 Initialized = 1; 1911 1912 if (Debug) { 1913 int port; 1914 STAILQ_FOREACH(f, &fhead, next) { 1915 for (i = 0; i <= LOG_NFACILITIES; i++) 1916 if (f->f_pmask[i] == INTERNAL_NOPRI) 1917 printf("X "); 1918 else 1919 printf("%d ", f->f_pmask[i]); 1920 printf("%s: ", TypeNames[f->f_type]); 1921 switch (f->f_type) { 1922 case F_FILE: 1923 printf("%s", f->fu_fname); 1924 break; 1925 1926 case F_CONSOLE: 1927 case F_TTY: 1928 printf("%s%s", _PATH_DEV, f->fu_fname); 1929 break; 1930 1931 case F_FORW: 1932 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 1933 if (port != 514) { 1934 printf("%s:%d", 1935 f->fu_forw_hname, port); 1936 } else { 1937 printf("%s", f->fu_forw_hname); 1938 } 1939 break; 1940 1941 case F_PIPE: 1942 printf("%s", f->fu_pipe_pname); 1943 break; 1944 1945 case F_USERS: 1946 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 1947 printf("%s, ", f->fu_uname[i]); 1948 break; 1949 } 1950 if (f->f_program) 1951 printf(" (%s)", f->f_program); 1952 printf("\n"); 1953 } 1954 } 1955 1956 logmsg(LOG_SYSLOG|LOG_INFO, "syslogd: restart", LocalHostName, ADDDATE); 1957 dprintf("syslogd: restarted\n"); 1958 /* 1959 * Log a change in hostname, but only on a restart. 1960 */ 1961 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 1962 (void)snprintf(hostMsg, sizeof(hostMsg), 1963 "syslogd: hostname changed, \"%s\" to \"%s\"", 1964 oldLocalHostName, LocalHostName); 1965 logmsg(LOG_SYSLOG|LOG_INFO, hostMsg, LocalHostName, ADDDATE); 1966 dprintf("%s\n", hostMsg); 1967 } 1968 /* 1969 * Log the kernel boot file if we aren't going to use it as 1970 * the prefix, and if this is *not* a restart. 1971 */ 1972 if (signo == 0 && !use_bootfile) { 1973 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 1974 "syslogd: kernel boot file is %s", bootfile); 1975 logmsg(LOG_KERN|LOG_INFO, bootfileMsg, LocalHostName, ADDDATE); 1976 dprintf("%s\n", bootfileMsg); 1977 } 1978 } 1979 1980 /* 1981 * Crack a configuration file line 1982 */ 1983 static struct filed * 1984 cfline(const char *line, const char *prog, const char *host) 1985 { 1986 struct filed *f; 1987 struct addrinfo hints, *res; 1988 int error, i, pri, syncfile; 1989 const char *p, *q; 1990 char *bp; 1991 char buf[MAXLINE], ebuf[100]; 1992 1993 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 1994 1995 f = calloc(1, sizeof(*f)); 1996 if (f == NULL) { 1997 logerror("malloc"); 1998 exit(1); 1999 } 2000 errno = 0; /* keep strerror() stuff out of logerror messages */ 2001 2002 for (i = 0; i <= LOG_NFACILITIES; i++) 2003 f->f_pmask[i] = INTERNAL_NOPRI; 2004 2005 /* save hostname if any */ 2006 if (host && *host == '*') 2007 host = NULL; 2008 if (host) { 2009 int hl; 2010 2011 f->f_host = strdup(host); 2012 if (f->f_host == NULL) { 2013 logerror("strdup"); 2014 exit(1); 2015 } 2016 hl = strlen(f->f_host); 2017 if (hl > 0 && f->f_host[hl-1] == '.') 2018 f->f_host[--hl] = '\0'; 2019 trimdomain(f->f_host, hl); 2020 } 2021 2022 /* save program name if any */ 2023 if (prog && *prog == '*') 2024 prog = NULL; 2025 if (prog) { 2026 f->f_program = strdup(prog); 2027 if (f->f_program == NULL) { 2028 logerror("strdup"); 2029 exit(1); 2030 } 2031 } 2032 2033 /* scan through the list of selectors */ 2034 for (p = line; *p && *p != '\t' && *p != ' ';) { 2035 int pri_done; 2036 int pri_cmp; 2037 int pri_invert; 2038 2039 /* find the end of this facility name list */ 2040 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2041 continue; 2042 2043 /* get the priority comparison */ 2044 pri_cmp = 0; 2045 pri_done = 0; 2046 pri_invert = 0; 2047 if (*q == '!') { 2048 pri_invert = 1; 2049 q++; 2050 } 2051 while (!pri_done) { 2052 switch (*q) { 2053 case '<': 2054 pri_cmp |= PRI_LT; 2055 q++; 2056 break; 2057 case '=': 2058 pri_cmp |= PRI_EQ; 2059 q++; 2060 break; 2061 case '>': 2062 pri_cmp |= PRI_GT; 2063 q++; 2064 break; 2065 default: 2066 pri_done++; 2067 break; 2068 } 2069 } 2070 2071 /* collect priority name */ 2072 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2073 *bp++ = *q++; 2074 *bp = '\0'; 2075 2076 /* skip cruft */ 2077 while (strchr(",;", *q)) 2078 q++; 2079 2080 /* decode priority name */ 2081 if (*buf == '*') { 2082 pri = LOG_PRIMASK; 2083 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2084 } else { 2085 /* Ignore trailing spaces. */ 2086 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2087 buf[i] = '\0'; 2088 2089 pri = decode(buf, prioritynames); 2090 if (pri < 0) { 2091 errno = 0; 2092 (void)snprintf(ebuf, sizeof ebuf, 2093 "unknown priority name \"%s\"", buf); 2094 logerror(ebuf); 2095 return (NULL); 2096 } 2097 } 2098 if (!pri_cmp) 2099 pri_cmp = (UniquePriority) 2100 ? (PRI_EQ) 2101 : (PRI_EQ | PRI_GT) 2102 ; 2103 if (pri_invert) 2104 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2105 2106 /* scan facilities */ 2107 while (*p && !strchr("\t.; ", *p)) { 2108 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2109 *bp++ = *p++; 2110 *bp = '\0'; 2111 2112 if (*buf == '*') { 2113 for (i = 0; i < LOG_NFACILITIES; i++) { 2114 f->f_pmask[i] = pri; 2115 f->f_pcmp[i] = pri_cmp; 2116 } 2117 } else { 2118 i = decode(buf, facilitynames); 2119 if (i < 0) { 2120 errno = 0; 2121 (void)snprintf(ebuf, sizeof ebuf, 2122 "unknown facility name \"%s\"", 2123 buf); 2124 logerror(ebuf); 2125 return (NULL); 2126 } 2127 f->f_pmask[i >> 3] = pri; 2128 f->f_pcmp[i >> 3] = pri_cmp; 2129 } 2130 while (*p == ',' || *p == ' ') 2131 p++; 2132 } 2133 2134 p = q; 2135 } 2136 2137 /* skip to action part */ 2138 while (*p == '\t' || *p == ' ') 2139 p++; 2140 2141 if (*p == '-') { 2142 syncfile = 0; 2143 p++; 2144 } else 2145 syncfile = 1; 2146 2147 switch (*p) { 2148 case '@': 2149 { 2150 char *tp; 2151 char endkey = ':'; 2152 /* 2153 * scan forward to see if there is a port defined. 2154 * so we can't use strlcpy.. 2155 */ 2156 i = sizeof(f->fu_forw_hname); 2157 tp = f->fu_forw_hname; 2158 p++; 2159 2160 /* 2161 * an ipv6 address should start with a '[' in that case 2162 * we should scan for a ']' 2163 */ 2164 if (*p == '[') { 2165 p++; 2166 endkey = ']'; 2167 } 2168 while (*p && (*p != endkey) && (i-- > 0)) { 2169 *tp++ = *p++; 2170 } 2171 if (endkey == ']' && *p == endkey) 2172 p++; 2173 *tp = '\0'; 2174 } 2175 /* See if we copied a domain and have a port */ 2176 if (*p == ':') 2177 p++; 2178 else 2179 p = NULL; 2180 2181 hints = (struct addrinfo){ 2182 .ai_family = family, 2183 .ai_socktype = SOCK_DGRAM 2184 }; 2185 error = getaddrinfo(f->fu_forw_hname, 2186 p ? p : "syslog", &hints, &res); 2187 if (error) { 2188 logerror(gai_strerror(error)); 2189 break; 2190 } 2191 f->fu_forw_addr = res; 2192 f->f_type = F_FORW; 2193 break; 2194 2195 case '/': 2196 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2197 f->f_type = F_UNUSED; 2198 logerror(p); 2199 break; 2200 } 2201 if (syncfile) 2202 f->f_flags |= FFLAG_SYNC; 2203 if (isatty(f->f_file)) { 2204 if (strcmp(p, ctty) == 0) 2205 f->f_type = F_CONSOLE; 2206 else 2207 f->f_type = F_TTY; 2208 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2209 sizeof(f->fu_fname)); 2210 } else { 2211 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2212 f->f_type = F_FILE; 2213 } 2214 break; 2215 2216 case '|': 2217 f->fu_pipe_pid = 0; 2218 (void)strlcpy(f->fu_pipe_pname, p + 1, 2219 sizeof(f->fu_pipe_pname)); 2220 f->f_type = F_PIPE; 2221 break; 2222 2223 case '*': 2224 f->f_type = F_WALL; 2225 break; 2226 2227 default: 2228 for (i = 0; i < MAXUNAMES && *p; i++) { 2229 for (q = p; *q && *q != ','; ) 2230 q++; 2231 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2232 if ((q - p) >= MAXLOGNAME) 2233 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2234 else 2235 f->fu_uname[i][q - p] = '\0'; 2236 while (*q == ',' || *q == ' ') 2237 q++; 2238 p = q; 2239 } 2240 f->f_type = F_USERS; 2241 break; 2242 } 2243 return (f); 2244 } 2245 2246 2247 /* 2248 * Decode a symbolic name to a numeric value 2249 */ 2250 static int 2251 decode(const char *name, const CODE *codetab) 2252 { 2253 const CODE *c; 2254 char *p, buf[40]; 2255 2256 if (isdigit(*name)) 2257 return (atoi(name)); 2258 2259 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2260 if (isupper(*name)) 2261 *p = tolower(*name); 2262 else 2263 *p = *name; 2264 } 2265 *p = '\0'; 2266 for (c = codetab; c->c_name; c++) 2267 if (!strcmp(buf, c->c_name)) 2268 return (c->c_val); 2269 2270 return (-1); 2271 } 2272 2273 static void 2274 markit(void) 2275 { 2276 struct filed *f; 2277 struct deadq_entry *dq, *dq0; 2278 2279 now = time((time_t *)NULL); 2280 MarkSeq += TIMERINTVL; 2281 if (MarkSeq >= MarkInterval) { 2282 logmsg(LOG_INFO, "-- MARK --", 2283 LocalHostName, ADDDATE|MARK); 2284 MarkSeq = 0; 2285 } 2286 2287 STAILQ_FOREACH(f, &fhead, next) { 2288 if (f->f_prevcount && now >= REPEATTIME(f)) { 2289 dprintf("flush %s: repeated %d times, %d sec.\n", 2290 TypeNames[f->f_type], f->f_prevcount, 2291 repeatinterval[f->f_repeatcount]); 2292 fprintlog(f, 0, (char *)NULL); 2293 BACKOFF(f); 2294 } 2295 } 2296 2297 /* Walk the dead queue, and see if we should signal somebody. */ 2298 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2299 switch (dq->dq_timeout) { 2300 case 0: 2301 /* Already signalled once, try harder now. */ 2302 if (kill(dq->dq_pid, SIGKILL) != 0) 2303 (void)deadq_remove(dq); 2304 break; 2305 2306 case 1: 2307 /* 2308 * Timed out on dead queue, send terminate 2309 * signal. Note that we leave the removal 2310 * from the dead queue to reapchild(), which 2311 * will also log the event (unless the process 2312 * didn't even really exist, in case we simply 2313 * drop it from the dead queue). 2314 */ 2315 if (kill(dq->dq_pid, SIGTERM) != 0) 2316 (void)deadq_remove(dq); 2317 else 2318 dq->dq_timeout--; 2319 break; 2320 default: 2321 dq->dq_timeout--; 2322 } 2323 } 2324 MarkSet = 0; 2325 (void)alarm(TIMERINTVL); 2326 } 2327 2328 /* 2329 * fork off and become a daemon, but wait for the child to come online 2330 * before returing to the parent, or we get disk thrashing at boot etc. 2331 * Set a timer so we don't hang forever if it wedges. 2332 */ 2333 static int 2334 waitdaemon(int maxwait) 2335 { 2336 int fd; 2337 int status; 2338 pid_t pid, childpid; 2339 2340 switch (childpid = fork()) { 2341 case -1: 2342 return (-1); 2343 case 0: 2344 break; 2345 default: 2346 signal(SIGALRM, timedout); 2347 alarm(maxwait); 2348 while ((pid = wait3(&status, 0, NULL)) != -1) { 2349 if (WIFEXITED(status)) 2350 errx(1, "child pid %d exited with return code %d", 2351 pid, WEXITSTATUS(status)); 2352 if (WIFSIGNALED(status)) 2353 errx(1, "child pid %d exited on signal %d%s", 2354 pid, WTERMSIG(status), 2355 WCOREDUMP(status) ? " (core dumped)" : 2356 ""); 2357 if (pid == childpid) /* it's gone... */ 2358 break; 2359 } 2360 exit(0); 2361 } 2362 2363 if (setsid() == -1) 2364 return (-1); 2365 2366 (void)chdir("/"); 2367 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2368 (void)dup2(fd, STDIN_FILENO); 2369 (void)dup2(fd, STDOUT_FILENO); 2370 (void)dup2(fd, STDERR_FILENO); 2371 if (fd > STDERR_FILENO) 2372 (void)close(fd); 2373 } 2374 return (getppid()); 2375 } 2376 2377 /* 2378 * We get a SIGALRM from the child when it's running and finished doing it's 2379 * fsync()'s or O_SYNC writes for all the boot messages. 2380 * 2381 * We also get a signal from the kernel if the timer expires, so check to 2382 * see what happened. 2383 */ 2384 static void 2385 timedout(int sig __unused) 2386 { 2387 int left; 2388 left = alarm(0); 2389 signal(SIGALRM, SIG_DFL); 2390 if (left == 0) 2391 errx(1, "timed out waiting for child"); 2392 else 2393 _exit(0); 2394 } 2395 2396 /* 2397 * Add `s' to the list of allowable peer addresses to accept messages 2398 * from. 2399 * 2400 * `s' is a string in the form: 2401 * 2402 * [*]domainname[:{servicename|portnumber|*}] 2403 * 2404 * or 2405 * 2406 * netaddr/maskbits[:{servicename|portnumber|*}] 2407 * 2408 * Returns -1 on error, 0 if the argument was valid. 2409 */ 2410 static int 2411 allowaddr(char *s) 2412 { 2413 char *cp1, *cp2; 2414 struct allowedpeer *ap; 2415 struct servent *se; 2416 int masklen = -1; 2417 struct addrinfo hints, *res; 2418 #ifdef INET 2419 in_addr_t *addrp, *maskp; 2420 #endif 2421 #ifdef INET6 2422 uint32_t *addr6p, *mask6p; 2423 #endif 2424 char ip[NI_MAXHOST]; 2425 2426 ap = calloc(1, sizeof(*ap)); 2427 if (ap == NULL) 2428 err(1, "malloc failed"); 2429 2430 #ifdef INET6 2431 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2432 #endif 2433 cp1 = s; 2434 if ((cp1 = strrchr(cp1, ':'))) { 2435 /* service/port provided */ 2436 *cp1++ = '\0'; 2437 if (strlen(cp1) == 1 && *cp1 == '*') 2438 /* any port allowed */ 2439 ap->port = 0; 2440 else if ((se = getservbyname(cp1, "udp"))) { 2441 ap->port = ntohs(se->s_port); 2442 } else { 2443 ap->port = strtol(cp1, &cp2, 0); 2444 if (*cp2 != '\0') 2445 return (-1); /* port not numeric */ 2446 } 2447 } else { 2448 if ((se = getservbyname("syslog", "udp"))) 2449 ap->port = ntohs(se->s_port); 2450 else 2451 /* sanity, should not happen */ 2452 ap->port = 514; 2453 } 2454 2455 if ((cp1 = strchr(s, '/')) != NULL && 2456 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2457 *cp1 = '\0'; 2458 if ((masklen = atoi(cp1 + 1)) < 0) 2459 return (-1); 2460 } 2461 #ifdef INET6 2462 if (*s == '[') { 2463 cp2 = s + strlen(s) - 1; 2464 if (*cp2 == ']') { 2465 ++s; 2466 *cp2 = '\0'; 2467 } else { 2468 cp2 = NULL; 2469 } 2470 } else { 2471 cp2 = NULL; 2472 } 2473 #endif 2474 hints = (struct addrinfo){ 2475 .ai_family = PF_UNSPEC, 2476 .ai_socktype = SOCK_DGRAM, 2477 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2478 }; 2479 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2480 ap->isnumeric = 1; 2481 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2482 ap->a_mask = (struct sockaddr_storage){ 2483 .ss_family = res->ai_family, 2484 .ss_len = res->ai_addrlen 2485 }; 2486 switch (res->ai_family) { 2487 #ifdef INET 2488 case AF_INET: 2489 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2490 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2491 if (masklen < 0) { 2492 /* use default netmask */ 2493 if (IN_CLASSA(ntohl(*addrp))) 2494 *maskp = htonl(IN_CLASSA_NET); 2495 else if (IN_CLASSB(ntohl(*addrp))) 2496 *maskp = htonl(IN_CLASSB_NET); 2497 else 2498 *maskp = htonl(IN_CLASSC_NET); 2499 } else if (masklen == 0) { 2500 *maskp = 0; 2501 } else if (masklen <= 32) { 2502 /* convert masklen to netmask */ 2503 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2504 } else { 2505 freeaddrinfo(res); 2506 return (-1); 2507 } 2508 /* Lose any host bits in the network number. */ 2509 *addrp &= *maskp; 2510 break; 2511 #endif 2512 #ifdef INET6 2513 case AF_INET6: 2514 if (masklen > 128) { 2515 freeaddrinfo(res); 2516 return (-1); 2517 } 2518 if (masklen < 0) 2519 masklen = 128; 2520 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2521 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2522 /* convert masklen to netmask */ 2523 while (masklen > 0) { 2524 if (masklen < 32) { 2525 *mask6p = 2526 htonl(~(0xffffffff >> masklen)); 2527 *addr6p &= *mask6p; 2528 break; 2529 } else { 2530 *mask6p++ = 0xffffffff; 2531 addr6p++; 2532 masklen -= 32; 2533 } 2534 } 2535 break; 2536 #endif 2537 default: 2538 freeaddrinfo(res); 2539 return (-1); 2540 } 2541 freeaddrinfo(res); 2542 } else { 2543 /* arg `s' is domain name */ 2544 ap->isnumeric = 0; 2545 ap->a_name = s; 2546 if (cp1) 2547 *cp1 = '/'; 2548 #ifdef INET6 2549 if (cp2) { 2550 *cp2 = ']'; 2551 --s; 2552 } 2553 #endif 2554 } 2555 STAILQ_INSERT_TAIL(&aphead, ap, next); 2556 2557 if (Debug) { 2558 printf("allowaddr: rule "); 2559 if (ap->isnumeric) { 2560 printf("numeric, "); 2561 getnameinfo(sstosa(&ap->a_addr), 2562 (sstosa(&ap->a_addr))->sa_len, 2563 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2564 printf("addr = %s, ", ip); 2565 getnameinfo(sstosa(&ap->a_mask), 2566 (sstosa(&ap->a_mask))->sa_len, 2567 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2568 printf("mask = %s; ", ip); 2569 } else { 2570 printf("domainname = %s; ", ap->a_name); 2571 } 2572 printf("port = %d\n", ap->port); 2573 } 2574 return (0); 2575 } 2576 2577 /* 2578 * Validate that the remote peer has permission to log to us. 2579 */ 2580 static int 2581 validate(struct sockaddr *sa, const char *hname) 2582 { 2583 int i; 2584 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2585 struct allowedpeer *ap; 2586 #ifdef INET 2587 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2588 #endif 2589 #ifdef INET6 2590 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2591 #endif 2592 struct addrinfo hints, *res; 2593 u_short sport; 2594 int num = 0; 2595 2596 STAILQ_FOREACH(ap, &aphead, next) { 2597 num++; 2598 } 2599 dprintf("# of validation rule: %d\n", num); 2600 if (num == 0) 2601 /* traditional behaviour, allow everything */ 2602 return (1); 2603 2604 (void)strlcpy(name, hname, sizeof(name)); 2605 hints = (struct addrinfo){ 2606 .ai_family = PF_UNSPEC, 2607 .ai_socktype = SOCK_DGRAM, 2608 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2609 }; 2610 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2611 freeaddrinfo(res); 2612 else if (strchr(name, '.') == NULL) { 2613 strlcat(name, ".", sizeof name); 2614 strlcat(name, LocalDomain, sizeof name); 2615 } 2616 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2617 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2618 return (0); /* for safety, should not occur */ 2619 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2620 ip, port, name); 2621 sport = atoi(port); 2622 2623 /* now, walk down the list */ 2624 i = 0; 2625 STAILQ_FOREACH(ap, &aphead, next) { 2626 i++; 2627 if (ap->port != 0 && ap->port != sport) { 2628 dprintf("rejected in rule %d due to port mismatch.\n", 2629 i); 2630 continue; 2631 } 2632 2633 if (ap->isnumeric) { 2634 if (ap->a_addr.ss_family != sa->sa_family) { 2635 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2636 continue; 2637 } 2638 #ifdef INET 2639 else if (ap->a_addr.ss_family == AF_INET) { 2640 sin4 = satosin(sa); 2641 a4p = satosin(&ap->a_addr); 2642 m4p = satosin(&ap->a_mask); 2643 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2644 != a4p->sin_addr.s_addr) { 2645 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2646 continue; 2647 } 2648 } 2649 #endif 2650 #ifdef INET6 2651 else if (ap->a_addr.ss_family == AF_INET6) { 2652 sin6 = satosin6(sa); 2653 a6p = satosin6(&ap->a_addr); 2654 m6p = satosin6(&ap->a_mask); 2655 if (a6p->sin6_scope_id != 0 && 2656 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2657 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2658 continue; 2659 } 2660 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2661 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2662 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2663 continue; 2664 } 2665 } 2666 #endif 2667 else 2668 continue; 2669 } else { 2670 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2671 FNM_NOMATCH) { 2672 dprintf("rejected in rule %d due to name " 2673 "mismatch.\n", i); 2674 continue; 2675 } 2676 } 2677 dprintf("accepted in rule %d.\n", i); 2678 return (1); /* hooray! */ 2679 } 2680 return (0); 2681 } 2682 2683 /* 2684 * Fairly similar to popen(3), but returns an open descriptor, as 2685 * opposed to a FILE *. 2686 */ 2687 static int 2688 p_open(const char *prog, pid_t *rpid) 2689 { 2690 int pfd[2], nulldesc; 2691 pid_t pid; 2692 char *argv[4]; /* sh -c cmd NULL */ 2693 char errmsg[200]; 2694 2695 if (pipe(pfd) == -1) 2696 return (-1); 2697 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2698 /* we are royally screwed anyway */ 2699 return (-1); 2700 2701 switch ((pid = fork())) { 2702 case -1: 2703 close(nulldesc); 2704 return (-1); 2705 2706 case 0: 2707 (void)setsid(); /* Avoid catching SIGHUPs. */ 2708 argv[0] = strdup("sh"); 2709 argv[1] = strdup("-c"); 2710 argv[2] = strdup(prog); 2711 argv[3] = NULL; 2712 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2713 logerror("strdup"); 2714 exit(1); 2715 } 2716 2717 alarm(0); 2718 2719 /* Restore signals marked as SIG_IGN. */ 2720 (void)signal(SIGINT, SIG_DFL); 2721 (void)signal(SIGQUIT, SIG_DFL); 2722 (void)signal(SIGPIPE, SIG_DFL); 2723 2724 dup2(pfd[0], STDIN_FILENO); 2725 dup2(nulldesc, STDOUT_FILENO); 2726 dup2(nulldesc, STDERR_FILENO); 2727 closefrom(STDERR_FILENO + 1); 2728 2729 (void)execvp(_PATH_BSHELL, argv); 2730 _exit(255); 2731 } 2732 close(nulldesc); 2733 close(pfd[0]); 2734 /* 2735 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2736 * supposed to get an EWOULDBLOCK on writev(2), which is 2737 * caught by the logic above anyway, which will in turn close 2738 * the pipe, and fork a new logging subprocess if necessary. 2739 * The stale subprocess will be killed some time later unless 2740 * it terminated itself due to closing its input pipe (so we 2741 * get rid of really dead puppies). 2742 */ 2743 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2744 /* This is bad. */ 2745 (void)snprintf(errmsg, sizeof errmsg, 2746 "Warning: cannot change pipe to PID %d to " 2747 "non-blocking behaviour.", 2748 (int)pid); 2749 logerror(errmsg); 2750 } 2751 *rpid = pid; 2752 return (pfd[1]); 2753 } 2754 2755 static void 2756 deadq_enter(pid_t pid, const char *name) 2757 { 2758 struct deadq_entry *dq; 2759 int status; 2760 2761 if (pid == 0) 2762 return; 2763 /* 2764 * Be paranoid, if we can't signal the process, don't enter it 2765 * into the dead queue (perhaps it's already dead). If possible, 2766 * we try to fetch and log the child's status. 2767 */ 2768 if (kill(pid, 0) != 0) { 2769 if (waitpid(pid, &status, WNOHANG) > 0) 2770 log_deadchild(pid, status, name); 2771 return; 2772 } 2773 2774 dq = malloc(sizeof(*dq)); 2775 if (dq == NULL) { 2776 logerror("malloc"); 2777 exit(1); 2778 } 2779 *dq = (struct deadq_entry){ 2780 .dq_pid = pid, 2781 .dq_timeout = DQ_TIMO_INIT 2782 }; 2783 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2784 } 2785 2786 static int 2787 deadq_remove(struct deadq_entry *dq) 2788 { 2789 if (dq != NULL) { 2790 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2791 free(dq); 2792 return (1); 2793 } 2794 2795 return (0); 2796 } 2797 2798 static int 2799 deadq_removebypid(pid_t pid) 2800 { 2801 struct deadq_entry *dq; 2802 2803 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2804 if (dq->dq_pid == pid) 2805 break; 2806 } 2807 return (deadq_remove(dq)); 2808 } 2809 2810 static void 2811 log_deadchild(pid_t pid, int status, const char *name) 2812 { 2813 int code; 2814 char buf[256]; 2815 const char *reason; 2816 2817 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2818 if (WIFSIGNALED(status)) { 2819 reason = "due to signal"; 2820 code = WTERMSIG(status); 2821 } else { 2822 reason = "with status"; 2823 code = WEXITSTATUS(status); 2824 if (code == 0) 2825 return; 2826 } 2827 (void)snprintf(buf, sizeof buf, 2828 "Logging subprocess %d (%s) exited %s %d.", 2829 pid, name, reason, code); 2830 logerror(buf); 2831 } 2832 2833 static int 2834 socksetup(struct peer *pe) 2835 { 2836 struct addrinfo hints, *res, *res0; 2837 int error; 2838 char *cp; 2839 /* 2840 * We have to handle this case for backwards compatibility: 2841 * If there are two (or more) colons but no '[' and ']', 2842 * assume this is an inet6 address without a service. 2843 */ 2844 if (pe->pe_name != NULL) { 2845 #ifdef INET6 2846 if (pe->pe_name[0] == '[' && 2847 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2848 pe->pe_name = &pe->pe_name[1]; 2849 *cp = '\0'; 2850 if (cp[1] == ':' && cp[2] != '\0') 2851 pe->pe_serv = cp + 2; 2852 } else { 2853 #endif 2854 cp = strchr(pe->pe_name, ':'); 2855 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2856 *cp = '\0'; 2857 if (cp[1] != '\0') 2858 pe->pe_serv = cp + 1; 2859 if (cp == pe->pe_name) 2860 pe->pe_name = NULL; 2861 } 2862 #ifdef INET6 2863 } 2864 #endif 2865 } 2866 hints = (struct addrinfo){ 2867 .ai_family = AF_UNSPEC, 2868 .ai_socktype = SOCK_DGRAM, 2869 .ai_flags = AI_PASSIVE 2870 }; 2871 dprintf("Try %s\n", pe->pe_name); 2872 if (pe->pe_serv == NULL) 2873 pe->pe_serv = "syslog"; 2874 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2875 if (error) { 2876 logerror(gai_strerror(error)); 2877 errno = 0; 2878 die(0); 2879 } 2880 for (res = res0; res != NULL; res = res->ai_next) { 2881 int s; 2882 2883 if (res->ai_family != AF_LOCAL && 2884 SecureMode > 1) { 2885 /* Only AF_LOCAL in secure mode. */ 2886 continue; 2887 } 2888 if (family != AF_UNSPEC && res->ai_family != family) 2889 continue; 2890 2891 s = socket(res->ai_family, res->ai_socktype, 2892 res->ai_protocol); 2893 if (s < 0) { 2894 logerror("socket"); 2895 error++; 2896 continue; 2897 } 2898 #ifdef INET6 2899 if (res->ai_family == AF_INET6) { 2900 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 2901 &(int){1}, sizeof(int)) < 0) { 2902 logerror("setsockopt(IPV6_V6ONLY)"); 2903 close(s); 2904 error++; 2905 continue; 2906 } 2907 } 2908 #endif 2909 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 2910 &(int){1}, sizeof(int)) < 0) { 2911 logerror("setsockopt(SO_REUSEADDR)"); 2912 close(s); 2913 error++; 2914 continue; 2915 } 2916 2917 /* 2918 * Bind INET and UNIX-domain sockets. 2919 * 2920 * A UNIX-domain socket is always bound to a pathname 2921 * regardless of -N flag. 2922 * 2923 * For INET sockets, RFC 3164 recommends that client 2924 * side message should come from the privileged syslogd port. 2925 * 2926 * If the system administrator chooses not to obey 2927 * this, we can skip the bind() step so that the 2928 * system will choose a port for us. 2929 */ 2930 if (res->ai_family == AF_LOCAL) 2931 unlink(pe->pe_name); 2932 if (res->ai_family == AF_LOCAL || 2933 NoBind == 0 || pe->pe_name != NULL) { 2934 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 2935 logerror("bind"); 2936 close(s); 2937 error++; 2938 continue; 2939 } 2940 if (res->ai_family == AF_LOCAL || 2941 SecureMode == 0) 2942 increase_rcvbuf(s); 2943 } 2944 if (res->ai_family == AF_LOCAL && 2945 chmod(pe->pe_name, pe->pe_mode) < 0) { 2946 dprintf("chmod %s: %s\n", pe->pe_name, 2947 strerror(errno)); 2948 close(s); 2949 error++; 2950 continue; 2951 } 2952 dprintf("new socket fd is %d\n", s); 2953 listen(s, 5); 2954 dprintf("shutdown\n"); 2955 if (SecureMode || res->ai_family == AF_LOCAL) { 2956 /* Forbid communication in secure mode. */ 2957 if (shutdown(s, SHUT_RD) < 0 && 2958 errno != ENOTCONN) { 2959 logerror("shutdown"); 2960 if (!Debug) 2961 die(0); 2962 } 2963 dprintf("listening on socket\n"); 2964 } else 2965 dprintf("sending on socket\n"); 2966 addsock(res->ai_addr, res->ai_addrlen, 2967 &(struct socklist){ 2968 .sl_socket = s, 2969 .sl_peer = pe, 2970 .sl_recv = socklist_recv_sock 2971 }); 2972 } 2973 freeaddrinfo(res0); 2974 2975 return(error); 2976 } 2977 2978 static void 2979 increase_rcvbuf(int fd) 2980 { 2981 socklen_t len; 2982 2983 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 2984 &(socklen_t){sizeof(len)}) == 0) { 2985 if (len < RCVBUF_MINSIZE) { 2986 len = RCVBUF_MINSIZE; 2987 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 2988 } 2989 } 2990 } 2991