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