1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 /* 48 * syslogd -- log system messages 49 * 50 * This program implements a system log. It takes a series of lines. 51 * Each line may have a priority, signified as "<n>" as 52 * the first characters of the line. If this is 53 * not present, a default priority is used. 54 * 55 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 56 * cause it to reread its configuration file. 57 * 58 * Defined Constants: 59 * 60 * MAXLINE -- the maximum line length that can be handled. 61 * DEFUPRI -- the default priority for user messages 62 * DEFSPRI -- the default priority for kernel messages 63 * 64 * Author: Eric Allman 65 * extensive changes by Ralph Campbell 66 * more extensive changes by Eric Allman (again) 67 * Extension to log by program name as well as facility and priority 68 * by Peter da Silva. 69 * -u and -v by Harlan Stenn. 70 * Priority comparison code by Harlan Stenn. 71 */ 72 73 /* Maximum number of characters in time of last occurrence */ 74 #define MAXDATELEN 16 75 #define MAXLINE 1024 /* maximum line length */ 76 #define MAXSVLINE MAXLINE /* maximum saved line length */ 77 #define DEFUPRI (LOG_USER|LOG_NOTICE) 78 #define DEFSPRI (LOG_KERN|LOG_CRIT) 79 #define TIMERINTVL 30 /* interval for checking flush, mark */ 80 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 81 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 82 83 #include <sys/param.h> 84 #include <sys/ioctl.h> 85 #include <sys/mman.h> 86 #include <sys/queue.h> 87 #include <sys/resource.h> 88 #include <sys/socket.h> 89 #include <sys/stat.h> 90 #include <sys/syslimits.h> 91 #include <sys/time.h> 92 #include <sys/uio.h> 93 #include <sys/un.h> 94 #include <sys/wait.h> 95 96 #if defined(INET) || defined(INET6) 97 #include <netinet/in.h> 98 #include <arpa/inet.h> 99 #endif 100 #include <netdb.h> 101 102 #include <ctype.h> 103 #include <dirent.h> 104 #include <err.h> 105 #include <errno.h> 106 #include <fcntl.h> 107 #include <fnmatch.h> 108 #include <libutil.h> 109 #include <limits.h> 110 #include <paths.h> 111 #include <signal.h> 112 #include <stdio.h> 113 #include <stdlib.h> 114 #include <string.h> 115 #include <sysexits.h> 116 #include <unistd.h> 117 #include <utmpx.h> 118 119 #include "pathnames.h" 120 #include "ttymsg.h" 121 122 #define SYSLOG_NAMES 123 #include <sys/syslog.h> 124 125 static const char *ConfFile = _PATH_LOGCONF; 126 static const char *PidFile = _PATH_LOGPID; 127 static const char ctty[] = _PATH_CONSOLE; 128 static const char include_str[] = "include"; 129 static const char include_ext[] = ".conf"; 130 131 #define dprintf if (Debug) printf 132 133 #define MAXUNAMES 20 /* maximum number of user names */ 134 135 #define sstosa(ss) ((struct sockaddr *)(ss)) 136 #ifdef INET 137 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 138 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 139 #endif 140 #ifdef INET6 141 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 142 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 143 #define s6_addr32 __u6_addr.__u6_addr32 144 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 145 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 146 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 147 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 148 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 149 #endif 150 /* 151 * List of peers and sockets for binding. 152 */ 153 struct peer { 154 const char *pe_name; 155 const char *pe_serv; 156 mode_t pe_mode; 157 STAILQ_ENTRY(peer) next; 158 }; 159 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 160 161 struct socklist { 162 struct sockaddr_storage sl_ss; 163 int sl_socket; 164 struct peer *sl_peer; 165 int (*sl_recv)(struct socklist *); 166 STAILQ_ENTRY(socklist) next; 167 }; 168 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 169 170 /* 171 * Flags to logmsg(). 172 */ 173 174 #define IGN_CONS 0x001 /* don't print on console */ 175 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 176 #define MARK 0x008 /* this message is a mark */ 177 #define ISKERNEL 0x010 /* kernel generated message */ 178 179 /* 180 * This structure represents the files that will have log 181 * copies printed. 182 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 183 * or if f_type is F_PIPE and f_pid > 0. 184 */ 185 186 struct filed { 187 STAILQ_ENTRY(filed) next; /* next in linked list */ 188 short f_type; /* entry type, see below */ 189 short f_file; /* file descriptor */ 190 time_t f_time; /* time this was last written */ 191 char *f_host; /* host from which to recd. */ 192 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 193 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 194 #define PRI_LT 0x1 195 #define PRI_EQ 0x2 196 #define PRI_GT 0x4 197 char *f_program; /* program this applies to */ 198 union { 199 char f_uname[MAXUNAMES][MAXLOGNAME]; 200 struct { 201 char f_hname[MAXHOSTNAMELEN]; 202 struct addrinfo *f_addr; 203 204 } f_forw; /* forwarding address */ 205 char f_fname[MAXPATHLEN]; 206 struct { 207 char f_pname[MAXPATHLEN]; 208 pid_t f_pid; 209 } f_pipe; 210 } f_un; 211 #define fu_uname f_un.f_uname 212 #define fu_forw_hname f_un.f_forw.f_hname 213 #define fu_forw_addr f_un.f_forw.f_addr 214 #define fu_fname f_un.f_fname 215 #define fu_pipe_pname f_un.f_pipe.f_pname 216 #define fu_pipe_pid f_un.f_pipe.f_pid 217 char f_prevline[MAXSVLINE]; /* last message logged */ 218 char f_lasttime[MAXDATELEN]; /* time of last occurrence */ 219 char f_prevhost[MAXHOSTNAMELEN]; /* host from which recd. */ 220 int f_prevpri; /* pri of f_prevline */ 221 int f_prevlen; /* length of f_prevline */ 222 int f_prevcount; /* repetition cnt of prevline */ 223 u_int f_repeatcount; /* number of "repeated" msgs */ 224 int f_flags; /* file-specific flags */ 225 #define FFLAG_SYNC 0x01 226 #define FFLAG_NEEDSYNC 0x02 227 }; 228 229 /* 230 * Queue of about-to-be dead processes we should watch out for. 231 */ 232 struct deadq_entry { 233 pid_t dq_pid; 234 int dq_timeout; 235 TAILQ_ENTRY(deadq_entry) dq_entries; 236 }; 237 static TAILQ_HEAD(, deadq_entry) deadq_head = 238 TAILQ_HEAD_INITIALIZER(deadq_head); 239 240 /* 241 * The timeout to apply to processes waiting on the dead queue. Unit 242 * of measure is `mark intervals', i.e. 20 minutes by default. 243 * Processes on the dead queue will be terminated after that time. 244 */ 245 246 #define DQ_TIMO_INIT 2 247 248 /* 249 * Struct to hold records of network addresses that are allowed to log 250 * to us. 251 */ 252 struct allowedpeer { 253 int isnumeric; 254 u_short port; 255 union { 256 struct { 257 struct sockaddr_storage addr; 258 struct sockaddr_storage mask; 259 } numeric; 260 char *name; 261 } u; 262 #define a_addr u.numeric.addr 263 #define a_mask u.numeric.mask 264 #define a_name u.name 265 STAILQ_ENTRY(allowedpeer) next; 266 }; 267 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 268 269 270 /* 271 * Intervals at which we flush out "message repeated" messages, 272 * in seconds after previous message is logged. After each flush, 273 * we move to the next interval until we reach the largest. 274 */ 275 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 276 #define MAXREPEAT (nitems(repeatinterval) - 1) 277 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 278 #define BACKOFF(f) do { \ 279 if (++(f)->f_repeatcount > MAXREPEAT) \ 280 (f)->f_repeatcount = MAXREPEAT; \ 281 } while (0) 282 283 /* values for f_type */ 284 #define F_UNUSED 0 /* unused entry */ 285 #define F_FILE 1 /* regular file */ 286 #define F_TTY 2 /* terminal */ 287 #define F_CONSOLE 3 /* console terminal */ 288 #define F_FORW 4 /* remote machine */ 289 #define F_USERS 5 /* list of users */ 290 #define F_WALL 6 /* everyone logged on */ 291 #define F_PIPE 7 /* pipe to program */ 292 293 static const char *TypeNames[] = { 294 "UNUSED", "FILE", "TTY", "CONSOLE", 295 "FORW", "USERS", "WALL", "PIPE" 296 }; 297 298 static STAILQ_HEAD(, filed) fhead = 299 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 300 static struct filed consfile; /* Console */ 301 302 static int Debug; /* debug flag */ 303 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 304 static int resolve = 1; /* resolve hostname */ 305 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 306 static const char *LocalDomain; /* our local domain name */ 307 static int Initialized; /* set when we have initialized ourselves */ 308 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 309 static int MarkSeq; /* mark sequence number */ 310 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 311 static int SecureMode; /* when true, receive only unix domain socks */ 312 #ifdef INET6 313 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 314 #else 315 static int family = PF_INET; /* protocol family (IPv4 only) */ 316 #endif 317 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 318 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 319 static int use_bootfile; /* log entire bootfile for every kern msg */ 320 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 321 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 322 323 static char bootfile[MAXLINE+1]; /* booted kernel file */ 324 325 static int RemoteAddDate; /* Always set the date on remote messages */ 326 static int RemoteHostname; /* Log remote hostname from the message */ 327 328 static int UniquePriority; /* Only log specified priority? */ 329 static int LogFacPri; /* Put facility and priority in log message: */ 330 /* 0=no, 1=numeric, 2=names */ 331 static int KeepKernFac; /* Keep remotely logged kernel facility */ 332 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 333 static struct pidfh *pfh; 334 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 335 336 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 337 338 static int allowaddr(char *); 339 static int addfile(struct filed *); 340 static int addpeer(struct peer *); 341 static int addsock(struct sockaddr *, socklen_t, struct socklist *); 342 static struct filed *cfline(const char *, const char *, const char *); 343 static const char *cvthname(struct sockaddr *); 344 static void deadq_enter(pid_t, const char *); 345 static int deadq_remove(struct deadq_entry *); 346 static int deadq_removebypid(pid_t); 347 static int decode(const char *, const CODE *); 348 static void die(int) __dead2; 349 static void dodie(int); 350 static void dofsync(void); 351 static void domark(int); 352 static void fprintlog(struct filed *, int, const char *); 353 static void init(int); 354 static void logerror(const char *); 355 static void logmsg(int, const char *, const char *, const char *, int); 356 static void log_deadchild(pid_t, int, const char *); 357 static void markit(void); 358 static int socksetup(struct peer *); 359 static int socklist_recv_file(struct socklist *); 360 static int socklist_recv_sock(struct socklist *); 361 static int socklist_recv_signal(struct socklist *); 362 static void sighandler(int); 363 static int skip_message(const char *, const char *, int); 364 static void parsemsg(const char *, char *); 365 static void printsys(char *); 366 static int p_open(const char *, pid_t *); 367 static void reapchild(int); 368 static const char *ttymsg_check(struct iovec *, int, char *, int); 369 static void usage(void); 370 static int validate(struct sockaddr *, const char *); 371 static void unmapped(struct sockaddr *); 372 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 373 static int waitdaemon(int); 374 static void timedout(int); 375 static void increase_rcvbuf(int); 376 377 static void 378 close_filed(struct filed *f) 379 { 380 381 if (f == NULL || f->f_file == -1) 382 return; 383 384 switch (f->f_type) { 385 case F_FORW: 386 if (f->f_un.f_forw.f_addr) { 387 freeaddrinfo(f->f_un.f_forw.f_addr); 388 f->f_un.f_forw.f_addr = NULL; 389 } 390 /* FALLTHROUGH */ 391 392 case F_FILE: 393 case F_TTY: 394 case F_CONSOLE: 395 f->f_type = F_UNUSED; 396 break; 397 case F_PIPE: 398 f->fu_pipe_pid = 0; 399 break; 400 } 401 (void)close(f->f_file); 402 f->f_file = -1; 403 } 404 405 static int 406 addfile(struct filed *f0) 407 { 408 struct filed *f; 409 410 f = calloc(1, sizeof(*f)); 411 if (f == NULL) 412 err(1, "malloc failed"); 413 *f = *f0; 414 STAILQ_INSERT_TAIL(&fhead, f, next); 415 416 return (0); 417 } 418 419 static int 420 addpeer(struct peer *pe0) 421 { 422 struct peer *pe; 423 424 pe = calloc(1, sizeof(*pe)); 425 if (pe == NULL) 426 err(1, "malloc failed"); 427 *pe = *pe0; 428 STAILQ_INSERT_TAIL(&pqueue, pe, next); 429 430 return (0); 431 } 432 433 static int 434 addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 435 { 436 struct socklist *sl; 437 438 sl = calloc(1, sizeof(*sl)); 439 if (sl == NULL) 440 err(1, "malloc failed"); 441 *sl = *sl0; 442 if (sa != NULL && sa_len > 0) 443 memcpy(&sl->sl_ss, sa, sa_len); 444 STAILQ_INSERT_TAIL(&shead, sl, next); 445 446 return (0); 447 } 448 449 int 450 main(int argc, char *argv[]) 451 { 452 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 453 fd_set *fdsr = NULL; 454 struct timeval tv, *tvp; 455 struct peer *pe; 456 struct socklist *sl; 457 pid_t ppid = 1, spid; 458 char *p; 459 460 if (madvise(NULL, 0, MADV_PROTECT) != 0) 461 dprintf("madvise() failed: %s\n", strerror(errno)); 462 463 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:m:nNop:P:sS:Tuv")) 464 != -1) 465 switch (ch) { 466 #ifdef INET 467 case '4': 468 family = PF_INET; 469 break; 470 #endif 471 #ifdef INET6 472 case '6': 473 family = PF_INET6; 474 break; 475 #endif 476 case '8': 477 mask_C1 = 0; 478 break; 479 case 'A': 480 send_to_all++; 481 break; 482 case 'a': /* allow specific network addresses only */ 483 if (allowaddr(optarg) == -1) 484 usage(); 485 break; 486 case 'b': 487 bflag = 1; 488 p = strchr(optarg, ']'); 489 if (p != NULL) 490 p = strchr(p + 1, ':'); 491 else { 492 p = strchr(optarg, ':'); 493 if (p != NULL && strchr(p + 1, ':') != NULL) 494 p = NULL; /* backward compatibility */ 495 } 496 if (p == NULL) { 497 /* A hostname or filename only. */ 498 addpeer(&(struct peer){ 499 .pe_name = optarg, 500 .pe_serv = "syslog" 501 }); 502 } else { 503 /* The case of "name:service". */ 504 *p++ = '\0'; 505 addpeer(&(struct peer){ 506 .pe_serv = p, 507 .pe_name = (strlen(optarg) == 0) ? 508 NULL : optarg, 509 }); 510 } 511 break; 512 case 'c': 513 no_compress++; 514 break; 515 case 'C': 516 logflags |= O_CREAT; 517 break; 518 case 'd': /* debug */ 519 Debug++; 520 break; 521 case 'f': /* configuration file */ 522 ConfFile = optarg; 523 break; 524 case 'F': /* run in foreground instead of daemon */ 525 Foreground++; 526 break; 527 case 'H': 528 RemoteHostname = 1; 529 break; 530 case 'k': /* keep remote kern fac */ 531 KeepKernFac = 1; 532 break; 533 case 'l': 534 case 'p': 535 case 'S': 536 { 537 long perml; 538 mode_t mode; 539 char *name, *ep; 540 541 if (ch == 'l') 542 mode = DEFFILEMODE; 543 else if (ch == 'p') { 544 mode = DEFFILEMODE; 545 pflag = 1; 546 } else if (ch == 'S') { 547 mode = S_IRUSR | S_IWUSR; 548 Sflag = 1; 549 } 550 if (optarg[0] == '/') 551 name = optarg; 552 else if ((name = strchr(optarg, ':')) != NULL) { 553 *name++ = '\0'; 554 if (name[0] != '/') 555 errx(1, "socket name must be absolute " 556 "path"); 557 if (isdigit(*optarg)) { 558 perml = strtol(optarg, &ep, 8); 559 if (*ep || perml < 0 || 560 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 561 errx(1, "invalid mode %s, exiting", 562 optarg); 563 mode = (mode_t )perml; 564 } else 565 errx(1, "invalid mode %s, exiting", 566 optarg); 567 } else 568 errx(1, "invalid filename %s, exiting", 569 optarg); 570 addpeer(&(struct peer){ 571 .pe_name = name, 572 .pe_mode = mode 573 }); 574 break; 575 } 576 case 'm': /* mark interval */ 577 MarkInterval = atoi(optarg) * 60; 578 break; 579 case 'N': 580 NoBind = 1; 581 SecureMode = 1; 582 break; 583 case 'n': 584 resolve = 0; 585 break; 586 case 'o': 587 use_bootfile = 1; 588 break; 589 case 'P': /* path for alt. PID */ 590 PidFile = optarg; 591 break; 592 case 's': /* no network mode */ 593 SecureMode++; 594 break; 595 case 'T': 596 RemoteAddDate = 1; 597 break; 598 case 'u': /* only log specified priority */ 599 UniquePriority++; 600 break; 601 case 'v': /* log facility and priority */ 602 LogFacPri++; 603 break; 604 default: 605 usage(); 606 } 607 if ((argc -= optind) != 0) 608 usage(); 609 610 /* Pipe to catch a signal during select(). */ 611 s = pipe2(sigpipe, O_CLOEXEC); 612 if (s < 0) { 613 err(1, "cannot open a pipe for signals"); 614 } else { 615 addsock(NULL, 0, &(struct socklist){ 616 .sl_socket = sigpipe[0], 617 .sl_recv = socklist_recv_signal 618 }); 619 } 620 621 /* Listen by default: /dev/klog. */ 622 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 623 if (s < 0) { 624 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 625 } else { 626 addsock(NULL, 0, &(struct socklist){ 627 .sl_socket = s, 628 .sl_recv = socklist_recv_file, 629 }); 630 } 631 /* Listen by default: *:514 if no -b flag. */ 632 if (bflag == 0) 633 addpeer(&(struct peer){ 634 .pe_serv = "syslog" 635 }); 636 /* Listen by default: /var/run/log if no -p flag. */ 637 if (pflag == 0) 638 addpeer(&(struct peer){ 639 .pe_name = _PATH_LOG, 640 .pe_mode = DEFFILEMODE, 641 }); 642 /* Listen by default: /var/run/logpriv if no -S flag. */ 643 if (Sflag == 0) 644 addpeer(&(struct peer){ 645 .pe_name = _PATH_LOG_PRIV, 646 .pe_mode = S_IRUSR | S_IWUSR, 647 }); 648 STAILQ_FOREACH(pe, &pqueue, next) 649 socksetup(pe); 650 651 pfh = pidfile_open(PidFile, 0600, &spid); 652 if (pfh == NULL) { 653 if (errno == EEXIST) 654 errx(1, "syslogd already running, pid: %d", spid); 655 warn("cannot open pid file"); 656 } 657 658 if ((!Foreground) && (!Debug)) { 659 ppid = waitdaemon(30); 660 if (ppid < 0) { 661 warn("could not become daemon"); 662 pidfile_remove(pfh); 663 exit(1); 664 } 665 } else if (Debug) 666 setlinebuf(stdout); 667 668 consfile.f_type = F_CONSOLE; 669 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 670 sizeof(consfile.fu_fname)); 671 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 672 (void)signal(SIGTERM, dodie); 673 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 674 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 675 (void)signal(SIGHUP, sighandler); 676 (void)signal(SIGCHLD, sighandler); 677 (void)signal(SIGALRM, domark); 678 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 679 (void)alarm(TIMERINTVL); 680 681 /* tuck my process id away */ 682 pidfile_write(pfh); 683 684 dprintf("off & running....\n"); 685 686 tvp = &tv; 687 tv.tv_sec = tv.tv_usec = 0; 688 689 STAILQ_FOREACH(sl, &shead, next) { 690 if (sl->sl_socket > fdsrmax) 691 fdsrmax = sl->sl_socket; 692 } 693 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 694 sizeof(fd_mask)); 695 if (fdsr == NULL) 696 errx(1, "calloc fd_set"); 697 698 for (;;) { 699 if (Initialized == 0) 700 init(0); 701 else if (WantInitialize) 702 init(WantInitialize); 703 if (WantReapchild) 704 reapchild(WantReapchild); 705 if (MarkSet) 706 markit(); 707 if (WantDie) { 708 free(fdsr); 709 die(WantDie); 710 } 711 712 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 713 sizeof(fd_mask)); 714 715 STAILQ_FOREACH(sl, &shead, next) { 716 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 717 FD_SET(sl->sl_socket, fdsr); 718 } 719 i = select(fdsrmax + 1, fdsr, NULL, NULL, 720 needdofsync ? &tv : tvp); 721 switch (i) { 722 case 0: 723 dofsync(); 724 needdofsync = 0; 725 if (tvp) { 726 tvp = NULL; 727 if (ppid != 1) 728 kill(ppid, SIGALRM); 729 } 730 continue; 731 case -1: 732 if (errno != EINTR) 733 logerror("select"); 734 continue; 735 } 736 STAILQ_FOREACH(sl, &shead, next) { 737 if (FD_ISSET(sl->sl_socket, fdsr)) 738 (*sl->sl_recv)(sl); 739 } 740 } 741 free(fdsr); 742 } 743 744 static int 745 socklist_recv_signal(struct socklist *sl __unused) 746 { 747 ssize_t len; 748 int i, nsig, signo; 749 750 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 751 logerror("ioctl(FIONREAD)"); 752 err(1, "signal pipe read failed"); 753 } 754 nsig = i / sizeof(signo); 755 dprintf("# of received signals = %d\n", nsig); 756 for (i = 0; i < nsig; i++) { 757 len = read(sigpipe[0], &signo, sizeof(signo)); 758 if (len != sizeof(signo)) { 759 logerror("signal pipe read failed"); 760 err(1, "signal pipe read failed"); 761 } 762 dprintf("Received signal: %d from fd=%d\n", signo, 763 sigpipe[0]); 764 switch (signo) { 765 case SIGHUP: 766 WantInitialize = 1; 767 break; 768 case SIGCHLD: 769 WantReapchild = 1; 770 break; 771 } 772 } 773 return (0); 774 } 775 776 static int 777 socklist_recv_sock(struct socklist *sl) 778 { 779 struct sockaddr_storage ss; 780 struct sockaddr *sa = (struct sockaddr *)&ss; 781 socklen_t sslen; 782 const char *hname; 783 char line[MAXLINE + 1]; 784 int len; 785 786 sslen = sizeof(ss); 787 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 788 dprintf("received sa_len = %d\n", sslen); 789 if (len == 0) 790 return (-1); 791 if (len < 0) { 792 if (errno != EINTR) 793 logerror("recvfrom"); 794 return (-1); 795 } 796 /* Received valid data. */ 797 line[len] = '\0'; 798 if (sl->sl_ss.ss_family == AF_LOCAL) 799 hname = LocalHostName; 800 else { 801 hname = cvthname(sa); 802 unmapped(sa); 803 if (validate(sa, hname) == 0) { 804 dprintf("Message from %s was ignored.", hname); 805 return (-1); 806 } 807 } 808 parsemsg(hname, line); 809 810 return (0); 811 } 812 813 static void 814 unmapped(struct sockaddr *sa) 815 { 816 #if defined(INET) && defined(INET6) 817 struct sockaddr_in6 *sin6; 818 struct sockaddr_in sin; 819 820 if (sa == NULL || 821 sa->sa_family != AF_INET6 || 822 sa->sa_len != sizeof(*sin6)) 823 return; 824 sin6 = satosin6(sa); 825 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 826 return; 827 sin = (struct sockaddr_in){ 828 .sin_family = AF_INET, 829 .sin_len = sizeof(sin), 830 .sin_port = sin6->sin6_port 831 }; 832 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 833 sizeof(sin.sin_addr)); 834 memcpy(sa, &sin, sizeof(sin)); 835 #else 836 if (sa == NULL) 837 return; 838 #endif 839 } 840 841 static void 842 usage(void) 843 { 844 845 fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n", 846 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]", 847 " [-b bind_address] [-f config_file]", 848 " [-l [mode:]path] [-m mark_interval]", 849 " [-P pid_file] [-p log_socket]", 850 " [-S logpriv_socket]"); 851 exit(1); 852 } 853 854 /* 855 * Take a raw input line, extract PRI, TIMESTAMP and HOSTNAME from the message, 856 * and print the message on the appropriate log files. 857 */ 858 static void 859 parsemsg(const char *from, char *msg) 860 { 861 const char *timestamp; 862 char *q; 863 long n; 864 int i, c, pri, msglen; 865 char line[MAXLINE + 1]; 866 867 /* Parse PRI. */ 868 if (msg[0] != '<' || !isdigit(msg[1])) { 869 dprintf("Invalid PRI from %s\n", from); 870 return; 871 } 872 for (i = 2; i <= 4; i++) { 873 if (msg[i] == '>') 874 break; 875 if (!isdigit(msg[i])) { 876 dprintf("Invalid PRI header from %s\n", from); 877 return; 878 } 879 } 880 if (msg[i] != '>') { 881 dprintf("Invalid PRI header from %s\n", from); 882 return; 883 } 884 errno = 0; 885 n = strtol(msg + 1, &q, 10); 886 if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) { 887 dprintf("Invalid PRI %ld from %s: %s\n", 888 n, from, strerror(errno)); 889 return; 890 } 891 pri = n; 892 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 893 pri = DEFUPRI; 894 895 /* 896 * Don't allow users to log kernel messages. 897 * NOTE: since LOG_KERN == 0 this will also match 898 * messages with no facility specified. 899 */ 900 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 901 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 902 903 /* 904 * The TIMESTAMP field is the local time and is in the format of 905 * "Mmm dd hh:mm:ss" (without the quote marks). 906 * A single space character MUST follow the TIMESTAMP field. 907 * 908 * XXXGL: the check can be improved. 909 */ 910 msg += i + 1; 911 msglen = strlen(msg); 912 if (msglen < MAXDATELEN || msg[3] != ' ' || msg[6] != ' ' || 913 msg[9] != ':' || msg[12] != ':' || msg[15] != ' ') { 914 dprintf("Invalid TIMESTAMP from %s: %s\n", from, msg); 915 return; 916 } 917 918 if (!RemoteAddDate) 919 timestamp = msg; 920 else 921 timestamp = NULL; 922 msg += MAXDATELEN; 923 msglen -= MAXDATELEN; 924 925 /* 926 * A single space character MUST also follow the HOSTNAME field. 927 */ 928 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 929 if (msg[i] == ' ') { 930 if (RemoteHostname) { 931 msg[i] = '\0'; 932 from = msg; 933 } 934 msg += i + 1; 935 break; 936 } 937 /* 938 * Support non RFC compliant messages, without hostname. 939 */ 940 if (msg[i] == ':') 941 break; 942 } 943 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 944 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 945 return; 946 } 947 948 q = line; 949 while ((c = (unsigned char)*msg++) != '\0' && 950 q < &line[sizeof(line) - 4]) { 951 if (mask_C1 && (c & 0x80) && c < 0xA0) { 952 c &= 0x7F; 953 *q++ = 'M'; 954 *q++ = '-'; 955 } 956 if (isascii(c) && iscntrl(c)) { 957 if (c == '\n') { 958 *q++ = ' '; 959 } else if (c == '\t') { 960 *q++ = '\t'; 961 } else { 962 *q++ = '^'; 963 *q++ = c ^ 0100; 964 } 965 } else { 966 *q++ = c; 967 } 968 } 969 *q = '\0'; 970 971 logmsg(pri, timestamp, line, from, 0); 972 } 973 974 /* 975 * Read /dev/klog while data are available, split into lines. 976 */ 977 static int 978 socklist_recv_file(struct socklist *sl) 979 { 980 char *p, *q, line[MAXLINE + 1]; 981 int len, i; 982 983 len = 0; 984 for (;;) { 985 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 986 if (i > 0) { 987 line[i + len] = '\0'; 988 } else { 989 if (i < 0 && errno != EINTR && errno != EAGAIN) { 990 logerror("klog"); 991 close(sl->sl_socket); 992 sl->sl_socket = -1; 993 } 994 break; 995 } 996 997 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 998 *q = '\0'; 999 printsys(p); 1000 } 1001 len = strlen(p); 1002 if (len >= MAXLINE - 1) { 1003 printsys(p); 1004 len = 0; 1005 } 1006 if (len > 0) 1007 memmove(line, p, len + 1); 1008 } 1009 if (len > 0) 1010 printsys(line); 1011 1012 return (len); 1013 } 1014 1015 /* 1016 * Take a raw input line from /dev/klog, format similar to syslog(). 1017 */ 1018 static void 1019 printsys(char *msg) 1020 { 1021 char *p, *q; 1022 long n; 1023 int flags, isprintf, pri; 1024 1025 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1026 p = msg; 1027 pri = DEFSPRI; 1028 isprintf = 1; 1029 if (*p == '<') { 1030 errno = 0; 1031 n = strtol(p + 1, &q, 10); 1032 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1033 p = q + 1; 1034 pri = n; 1035 isprintf = 0; 1036 } 1037 } 1038 /* 1039 * Kernel printf's and LOG_CONSOLE messages have been displayed 1040 * on the console already. 1041 */ 1042 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1043 flags |= IGN_CONS; 1044 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1045 pri = DEFSPRI; 1046 logmsg(pri, NULL, p, LocalHostName, flags); 1047 } 1048 1049 static time_t now; 1050 1051 /* 1052 * Match a program or host name against a specification. 1053 * Return a non-0 value if the message must be ignored 1054 * based on the specification. 1055 */ 1056 static int 1057 skip_message(const char *name, const char *spec, int checkcase) 1058 { 1059 const char *s; 1060 char prev, next; 1061 int exclude = 0; 1062 /* Behaviour on explicit match */ 1063 1064 if (spec == NULL) 1065 return 0; 1066 switch (*spec) { 1067 case '-': 1068 exclude = 1; 1069 /*FALLTHROUGH*/ 1070 case '+': 1071 spec++; 1072 break; 1073 default: 1074 break; 1075 } 1076 if (checkcase) 1077 s = strstr (spec, name); 1078 else 1079 s = strcasestr (spec, name); 1080 1081 if (s != NULL) { 1082 prev = (s == spec ? ',' : *(s - 1)); 1083 next = *(s + strlen (name)); 1084 1085 if (prev == ',' && (next == '\0' || next == ',')) 1086 /* Explicit match: skip iff the spec is an 1087 exclusive one. */ 1088 return exclude; 1089 } 1090 1091 /* No explicit match for this name: skip the message iff 1092 the spec is an inclusive one. */ 1093 return !exclude; 1094 } 1095 1096 /* 1097 * Log a message to the appropriate log files, users, etc. based on 1098 * the priority. 1099 */ 1100 static void 1101 logmsg(int pri, const char *timestamp, const char *msg, const char *from, 1102 int flags) 1103 { 1104 struct filed *f; 1105 int i, fac, msglen, prilev; 1106 char prog[NAME_MAX+1]; 1107 char buf[MAXLINE+1]; 1108 1109 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1110 pri, flags, from, msg); 1111 1112 (void)time(&now); 1113 if (timestamp == NULL) 1114 timestamp = ctime(&now) + 4; 1115 1116 /* extract facility and priority level */ 1117 if (flags & MARK) 1118 fac = LOG_NFACILITIES; 1119 else 1120 fac = LOG_FAC(pri); 1121 1122 /* Check maximum facility number. */ 1123 if (fac > LOG_NFACILITIES) 1124 return; 1125 1126 prilev = LOG_PRI(pri); 1127 1128 /* Extract TAG part of the message (usually program name). */ 1129 for (i = 0; i < NAME_MAX; i++) { 1130 if (!isprint(msg[i]) || msg[i] == ':' || msg[i] == '[' || 1131 msg[i] == '/' || isspace(msg[i])) 1132 break; 1133 prog[i] = msg[i]; 1134 } 1135 prog[i] = 0; 1136 1137 /* add kernel prefix for kernel messages */ 1138 if (flags & ISKERNEL) { 1139 snprintf(buf, sizeof(buf), "%s: %s", 1140 use_bootfile ? bootfile : "kernel", msg); 1141 msg = buf; 1142 } 1143 msglen = strlen(msg); 1144 1145 /* log the message to the particular outputs */ 1146 if (!Initialized) { 1147 f = &consfile; 1148 /* 1149 * Open in non-blocking mode to avoid hangs during open 1150 * and close(waiting for the port to drain). 1151 */ 1152 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1153 1154 if (f->f_file >= 0) { 1155 (void)strlcpy(f->f_lasttime, timestamp, 1156 sizeof(f->f_lasttime)); 1157 fprintlog(f, flags, msg); 1158 close(f->f_file); 1159 f->f_file = -1; 1160 } 1161 return; 1162 } 1163 STAILQ_FOREACH(f, &fhead, next) { 1164 /* skip messages that are incorrect priority */ 1165 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1166 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1167 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1168 ) 1169 || f->f_pmask[fac] == INTERNAL_NOPRI) 1170 continue; 1171 1172 /* skip messages with the incorrect hostname */ 1173 if (skip_message(from, f->f_host, 0)) 1174 continue; 1175 1176 /* skip messages with the incorrect program name */ 1177 if (skip_message(prog, f->f_program, 1)) 1178 continue; 1179 1180 /* skip message to console if it has already been printed */ 1181 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1182 continue; 1183 1184 /* don't output marks to recently written files */ 1185 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1186 continue; 1187 1188 /* 1189 * suppress duplicate lines to this file 1190 */ 1191 if (no_compress - (f->f_type != F_PIPE) < 1 && 1192 (flags & MARK) == 0 && msglen == f->f_prevlen && 1193 !strcmp(msg, f->f_prevline) && 1194 !strcasecmp(from, f->f_prevhost)) { 1195 (void)strlcpy(f->f_lasttime, timestamp, 1196 sizeof(f->f_lasttime)); 1197 f->f_prevcount++; 1198 dprintf("msg repeated %d times, %ld sec of %d\n", 1199 f->f_prevcount, (long)(now - f->f_time), 1200 repeatinterval[f->f_repeatcount]); 1201 /* 1202 * If domark would have logged this by now, 1203 * flush it now (so we don't hold isolated messages), 1204 * but back off so we'll flush less often 1205 * in the future. 1206 */ 1207 if (now > REPEATTIME(f)) { 1208 fprintlog(f, flags, (char *)NULL); 1209 BACKOFF(f); 1210 } 1211 } else { 1212 /* new line, save it */ 1213 if (f->f_prevcount) 1214 fprintlog(f, 0, (char *)NULL); 1215 f->f_repeatcount = 0; 1216 f->f_prevpri = pri; 1217 (void)strlcpy(f->f_lasttime, timestamp, 1218 sizeof(f->f_lasttime)); 1219 (void)strlcpy(f->f_prevhost, from, 1220 sizeof(f->f_prevhost)); 1221 if (msglen < MAXSVLINE) { 1222 f->f_prevlen = msglen; 1223 (void)strlcpy(f->f_prevline, msg, sizeof(f->f_prevline)); 1224 fprintlog(f, flags, (char *)NULL); 1225 } else { 1226 f->f_prevline[0] = 0; 1227 f->f_prevlen = 0; 1228 fprintlog(f, flags, msg); 1229 } 1230 } 1231 } 1232 } 1233 1234 static void 1235 dofsync(void) 1236 { 1237 struct filed *f; 1238 1239 STAILQ_FOREACH(f, &fhead, next) { 1240 if ((f->f_type == F_FILE) && 1241 (f->f_flags & FFLAG_NEEDSYNC)) { 1242 f->f_flags &= ~FFLAG_NEEDSYNC; 1243 (void)fsync(f->f_file); 1244 } 1245 } 1246 } 1247 1248 #define IOV_SIZE 7 1249 static void 1250 fprintlog(struct filed *f, int flags, const char *msg) 1251 { 1252 struct iovec iov[IOV_SIZE]; 1253 struct addrinfo *r; 1254 int l, lsent = 0; 1255 char line[MAXLINE + 1], repbuf[80], greetings[200], *wmsg = NULL; 1256 char nul[] = "", space[] = " ", lf[] = "\n", crlf[] = "\r\n"; 1257 const char *msgret; 1258 1259 if (f->f_type == F_WALL) { 1260 /* The time displayed is not synchornized with the other log 1261 * destinations (like messages). Following fragment was using 1262 * ctime(&now), which was updating the time every 30 sec. 1263 * With f_lasttime, time is synchronized correctly. 1264 */ 1265 iov[0] = (struct iovec){ 1266 .iov_base = greetings, 1267 .iov_len = snprintf(greetings, sizeof(greetings), 1268 "\r\n\7Message from syslogd@%s " 1269 "at %.24s ...\r\n", 1270 f->f_prevhost, f->f_lasttime) 1271 }; 1272 if (iov[0].iov_len >= sizeof(greetings)) 1273 iov[0].iov_len = sizeof(greetings) - 1; 1274 iov[1] = (struct iovec){ 1275 .iov_base = nul, 1276 .iov_len = 0 1277 }; 1278 } else { 1279 iov[0] = (struct iovec){ 1280 .iov_base = f->f_lasttime, 1281 .iov_len = strlen(f->f_lasttime) 1282 }; 1283 iov[1] = (struct iovec){ 1284 .iov_base = space, 1285 .iov_len = 1 1286 }; 1287 } 1288 1289 if (LogFacPri) { 1290 static char fp_buf[30]; /* Hollow laugh */ 1291 int fac = f->f_prevpri & LOG_FACMASK; 1292 int pri = LOG_PRI(f->f_prevpri); 1293 const char *f_s = NULL; 1294 char f_n[5]; /* Hollow laugh */ 1295 const char *p_s = NULL; 1296 char p_n[5]; /* Hollow laugh */ 1297 1298 if (LogFacPri > 1) { 1299 const CODE *c; 1300 1301 for (c = facilitynames; c->c_name; c++) { 1302 if (c->c_val == fac) { 1303 f_s = c->c_name; 1304 break; 1305 } 1306 } 1307 for (c = prioritynames; c->c_name; c++) { 1308 if (c->c_val == pri) { 1309 p_s = c->c_name; 1310 break; 1311 } 1312 } 1313 } 1314 if (!f_s) { 1315 snprintf(f_n, sizeof f_n, "%d", LOG_FAC(fac)); 1316 f_s = f_n; 1317 } 1318 if (!p_s) { 1319 snprintf(p_n, sizeof p_n, "%d", pri); 1320 p_s = p_n; 1321 } 1322 snprintf(fp_buf, sizeof fp_buf, "<%s.%s> ", f_s, p_s); 1323 iov[2] = (struct iovec){ 1324 .iov_base = fp_buf, 1325 .iov_len = strlen(fp_buf) 1326 }; 1327 } else { 1328 iov[2] = (struct iovec){ 1329 .iov_base = nul, 1330 .iov_len = 0 1331 }; 1332 } 1333 iov[3] = (struct iovec){ 1334 .iov_base = f->f_prevhost, 1335 .iov_len = strlen(f->f_prevhost) 1336 }; 1337 iov[4] = (struct iovec){ 1338 .iov_base = space, 1339 .iov_len = 1 1340 }; 1341 if (msg) { 1342 wmsg = strdup(msg); /* XXX iov_base needs a `const' sibling. */ 1343 if (wmsg == NULL) { 1344 logerror("strdup"); 1345 exit(1); 1346 } 1347 iov[5] = (struct iovec){ 1348 .iov_base = wmsg, 1349 .iov_len = strlen(msg) 1350 }; 1351 } else if (f->f_prevcount > 1) { 1352 iov[5] = (struct iovec){ 1353 .iov_base = repbuf, 1354 .iov_len = snprintf(repbuf, sizeof(repbuf), 1355 "last message repeated %d times", f->f_prevcount) 1356 }; 1357 } else { 1358 iov[5] = (struct iovec){ 1359 .iov_base = f->f_prevline, 1360 .iov_len = f->f_prevlen 1361 }; 1362 } 1363 dprintf("Logging to %s", TypeNames[f->f_type]); 1364 f->f_time = now; 1365 1366 switch (f->f_type) { 1367 case F_UNUSED: 1368 dprintf("\n"); 1369 break; 1370 1371 case F_FORW: 1372 dprintf(" %s", f->fu_forw_hname); 1373 switch (f->fu_forw_addr->ai_addr->sa_family) { 1374 #ifdef INET 1375 case AF_INET: 1376 dprintf(":%d\n", 1377 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1378 break; 1379 #endif 1380 #ifdef INET6 1381 case AF_INET6: 1382 dprintf(":%d\n", 1383 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1384 break; 1385 #endif 1386 default: 1387 dprintf("\n"); 1388 } 1389 /* check for local vs remote messages */ 1390 if (strcasecmp(f->f_prevhost, LocalHostName)) 1391 l = snprintf(line, sizeof line - 1, 1392 "<%d>%.15s Forwarded from %s: %s", 1393 f->f_prevpri, (char *)iov[0].iov_base, 1394 f->f_prevhost, (char *)iov[5].iov_base); 1395 else 1396 l = snprintf(line, sizeof line - 1, "<%d>%.15s %s", 1397 f->f_prevpri, (char *)iov[0].iov_base, 1398 (char *)iov[5].iov_base); 1399 if (l < 0) 1400 l = 0; 1401 else if (l > MAXLINE) 1402 l = MAXLINE; 1403 1404 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1405 struct socklist *sl; 1406 1407 STAILQ_FOREACH(sl, &shead, next) { 1408 if (sl->sl_ss.ss_family == AF_LOCAL || 1409 sl->sl_ss.ss_family == AF_UNSPEC || 1410 sl->sl_socket < 0) 1411 continue; 1412 lsent = sendto(sl->sl_socket, line, l, 0, 1413 r->ai_addr, r->ai_addrlen); 1414 if (lsent == l) 1415 break; 1416 } 1417 if (lsent == l && !send_to_all) 1418 break; 1419 } 1420 dprintf("lsent/l: %d/%d\n", lsent, l); 1421 if (lsent != l) { 1422 int e = errno; 1423 logerror("sendto"); 1424 errno = e; 1425 switch (errno) { 1426 case ENOBUFS: 1427 case ENETDOWN: 1428 case ENETUNREACH: 1429 case EHOSTUNREACH: 1430 case EHOSTDOWN: 1431 case EADDRNOTAVAIL: 1432 break; 1433 /* case EBADF: */ 1434 /* case EACCES: */ 1435 /* case ENOTSOCK: */ 1436 /* case EFAULT: */ 1437 /* case EMSGSIZE: */ 1438 /* case EAGAIN: */ 1439 /* case ENOBUFS: */ 1440 /* case ECONNREFUSED: */ 1441 default: 1442 dprintf("removing entry: errno=%d\n", e); 1443 f->f_type = F_UNUSED; 1444 break; 1445 } 1446 } 1447 break; 1448 1449 case F_FILE: 1450 dprintf(" %s\n", f->fu_fname); 1451 iov[6] = (struct iovec){ 1452 .iov_base = lf, 1453 .iov_len = 1 1454 }; 1455 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1456 /* 1457 * If writev(2) fails for potentially transient errors 1458 * like the filesystem being full, ignore it. 1459 * Otherwise remove this logfile from the list. 1460 */ 1461 if (errno != ENOSPC) { 1462 int e = errno; 1463 close_filed(f); 1464 errno = e; 1465 logerror(f->fu_fname); 1466 } 1467 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1468 f->f_flags |= FFLAG_NEEDSYNC; 1469 needdofsync = 1; 1470 } 1471 break; 1472 1473 case F_PIPE: 1474 dprintf(" %s\n", f->fu_pipe_pname); 1475 iov[6] = (struct iovec){ 1476 .iov_base = lf, 1477 .iov_len = 1 1478 }; 1479 if (f->fu_pipe_pid == 0) { 1480 if ((f->f_file = p_open(f->fu_pipe_pname, 1481 &f->fu_pipe_pid)) < 0) { 1482 logerror(f->fu_pipe_pname); 1483 break; 1484 } 1485 } 1486 if (writev(f->f_file, iov, nitems(iov)) < 0) { 1487 int e = errno; 1488 1489 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1490 close_filed(f); 1491 errno = e; 1492 logerror(f->fu_pipe_pname); 1493 } 1494 break; 1495 1496 case F_CONSOLE: 1497 if (flags & IGN_CONS) { 1498 dprintf(" (ignored)\n"); 1499 break; 1500 } 1501 /* FALLTHROUGH */ 1502 1503 case F_TTY: 1504 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1505 iov[6] = (struct iovec){ 1506 .iov_base = crlf, 1507 .iov_len = 2 1508 }; 1509 errno = 0; /* ttymsg() only sometimes returns an errno */ 1510 if ((msgret = ttymsg(iov, nitems(iov), f->fu_fname, 10))) { 1511 f->f_type = F_UNUSED; 1512 logerror(msgret); 1513 } 1514 break; 1515 1516 case F_USERS: 1517 case F_WALL: 1518 dprintf("\n"); 1519 iov[6] = (struct iovec){ 1520 .iov_base = crlf, 1521 .iov_len = 2 1522 }; 1523 wallmsg(f, iov, nitems(iov)); 1524 break; 1525 } 1526 f->f_prevcount = 0; 1527 free(wmsg); 1528 } 1529 1530 /* 1531 * WALLMSG -- Write a message to the world at large 1532 * 1533 * Write the specified message to either the entire 1534 * world, or a list of approved users. 1535 */ 1536 static void 1537 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 1538 { 1539 static int reenter; /* avoid calling ourselves */ 1540 struct utmpx *ut; 1541 int i; 1542 const char *p; 1543 1544 if (reenter++) 1545 return; 1546 setutxent(); 1547 /* NOSTRICT */ 1548 while ((ut = getutxent()) != NULL) { 1549 if (ut->ut_type != USER_PROCESS) 1550 continue; 1551 if (f->f_type == F_WALL) { 1552 if ((p = ttymsg(iov, iovlen, ut->ut_line, 1553 TTYMSGTIME)) != NULL) { 1554 errno = 0; /* already in msg */ 1555 logerror(p); 1556 } 1557 continue; 1558 } 1559 /* should we send the message to this user? */ 1560 for (i = 0; i < MAXUNAMES; i++) { 1561 if (!f->fu_uname[i][0]) 1562 break; 1563 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 1564 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 1565 TTYMSGTIME)) != NULL) { 1566 errno = 0; /* already in msg */ 1567 logerror(p); 1568 } 1569 break; 1570 } 1571 } 1572 } 1573 endutxent(); 1574 reenter = 0; 1575 } 1576 1577 /* 1578 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 1579 */ 1580 static const char * 1581 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 1582 { 1583 static char device[1024]; 1584 static char errbuf[1024]; 1585 struct stat sb; 1586 1587 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 1588 1589 if (stat(device, &sb) < 0) { 1590 (void) snprintf(errbuf, sizeof(errbuf), 1591 "%s: %s", device, strerror(errno)); 1592 return (errbuf); 1593 } 1594 if ((sb.st_mode & S_IWGRP) == 0) 1595 /* Messages disabled. */ 1596 return (NULL); 1597 return ttymsg(iov, iovcnt, line, tmout); 1598 } 1599 1600 static void 1601 reapchild(int signo __unused) 1602 { 1603 int status; 1604 pid_t pid; 1605 struct filed *f; 1606 1607 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 1608 /* First, look if it's a process from the dead queue. */ 1609 if (deadq_removebypid(pid)) 1610 continue; 1611 1612 /* Now, look in list of active processes. */ 1613 STAILQ_FOREACH(f, &fhead, next) { 1614 if (f->f_type == F_PIPE && 1615 f->fu_pipe_pid == pid) { 1616 close_filed(f); 1617 log_deadchild(pid, status, f->fu_pipe_pname); 1618 break; 1619 } 1620 } 1621 } 1622 WantReapchild = 0; 1623 } 1624 1625 /* 1626 * Return a printable representation of a host address. 1627 */ 1628 static const char * 1629 cvthname(struct sockaddr *f) 1630 { 1631 int error, hl; 1632 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 1633 1634 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 1635 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 1636 NI_NUMERICHOST); 1637 if (error) { 1638 dprintf("Malformed from address %s\n", gai_strerror(error)); 1639 return ("???"); 1640 } 1641 dprintf("cvthname(%s)\n", ip); 1642 1643 if (!resolve) 1644 return (ip); 1645 1646 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 1647 NULL, 0, NI_NAMEREQD); 1648 if (error) { 1649 dprintf("Host name for your address (%s) unknown\n", ip); 1650 return (ip); 1651 } 1652 hl = strlen(hname); 1653 if (hl > 0 && hname[hl-1] == '.') 1654 hname[--hl] = '\0'; 1655 trimdomain(hname, hl); 1656 return (hname); 1657 } 1658 1659 static void 1660 dodie(int signo) 1661 { 1662 1663 WantDie = signo; 1664 } 1665 1666 static void 1667 domark(int signo __unused) 1668 { 1669 1670 MarkSet = 1; 1671 } 1672 1673 /* 1674 * Print syslogd errors some place. 1675 */ 1676 static void 1677 logerror(const char *type) 1678 { 1679 char buf[512]; 1680 static int recursed = 0; 1681 1682 /* If there's an error while trying to log an error, give up. */ 1683 if (recursed) 1684 return; 1685 recursed++; 1686 if (errno) 1687 (void)snprintf(buf, 1688 sizeof buf, "syslogd: %s: %s", type, strerror(errno)); 1689 else 1690 (void)snprintf(buf, sizeof buf, "syslogd: %s", type); 1691 errno = 0; 1692 dprintf("%s\n", buf); 1693 logmsg(LOG_SYSLOG|LOG_ERR, NULL, buf, LocalHostName, 0); 1694 recursed--; 1695 } 1696 1697 static void 1698 die(int signo) 1699 { 1700 struct filed *f; 1701 struct socklist *sl; 1702 char buf[100]; 1703 1704 STAILQ_FOREACH(f, &fhead, next) { 1705 /* flush any pending output */ 1706 if (f->f_prevcount) 1707 fprintlog(f, 0, (char *)NULL); 1708 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 1709 close_filed(f); 1710 } 1711 if (signo) { 1712 dprintf("syslogd: exiting on signal %d\n", signo); 1713 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 1714 errno = 0; 1715 logerror(buf); 1716 } 1717 STAILQ_FOREACH(sl, &shead, next) { 1718 if (sl->sl_ss.ss_family == AF_LOCAL) 1719 unlink(sl->sl_peer->pe_name); 1720 } 1721 pidfile_remove(pfh); 1722 1723 exit(1); 1724 } 1725 1726 static int 1727 configfiles(const struct dirent *dp) 1728 { 1729 const char *p; 1730 size_t ext_len; 1731 1732 if (dp->d_name[0] == '.') 1733 return (0); 1734 1735 ext_len = sizeof(include_ext) -1; 1736 1737 if (dp->d_namlen <= ext_len) 1738 return (0); 1739 1740 p = &dp->d_name[dp->d_namlen - ext_len]; 1741 if (strcmp(p, include_ext) != 0) 1742 return (0); 1743 1744 return (1); 1745 } 1746 1747 static void 1748 readconfigfile(FILE *cf, int allow_includes) 1749 { 1750 FILE *cf2; 1751 struct filed *f; 1752 struct dirent **ent; 1753 char cline[LINE_MAX]; 1754 char host[MAXHOSTNAMELEN]; 1755 char prog[LINE_MAX]; 1756 char file[MAXPATHLEN]; 1757 char *p, *tmp; 1758 int i, nents; 1759 size_t include_len; 1760 1761 /* 1762 * Foreach line in the conf table, open that file. 1763 */ 1764 include_len = sizeof(include_str) -1; 1765 (void)strlcpy(host, "*", sizeof(host)); 1766 (void)strlcpy(prog, "*", sizeof(prog)); 1767 while (fgets(cline, sizeof(cline), cf) != NULL) { 1768 /* 1769 * check for end-of-section, comments, strip off trailing 1770 * spaces and newline character. #!prog is treated specially: 1771 * following lines apply only to that program. 1772 */ 1773 for (p = cline; isspace(*p); ++p) 1774 continue; 1775 if (*p == 0) 1776 continue; 1777 if (allow_includes && 1778 strncmp(p, include_str, include_len) == 0 && 1779 isspace(p[include_len])) { 1780 p += include_len; 1781 while (isspace(*p)) 1782 p++; 1783 tmp = p; 1784 while (*tmp != '\0' && !isspace(*tmp)) 1785 tmp++; 1786 *tmp = '\0'; 1787 dprintf("Trying to include files in '%s'\n", p); 1788 nents = scandir(p, &ent, configfiles, alphasort); 1789 if (nents == -1) { 1790 dprintf("Unable to open '%s': %s\n", p, 1791 strerror(errno)); 1792 continue; 1793 } 1794 for (i = 0; i < nents; i++) { 1795 if (snprintf(file, sizeof(file), "%s/%s", p, 1796 ent[i]->d_name) >= (int)sizeof(file)) { 1797 dprintf("ignoring path too long: " 1798 "'%s/%s'\n", p, ent[i]->d_name); 1799 free(ent[i]); 1800 continue; 1801 } 1802 free(ent[i]); 1803 cf2 = fopen(file, "r"); 1804 if (cf2 == NULL) 1805 continue; 1806 dprintf("reading %s\n", file); 1807 readconfigfile(cf2, 0); 1808 fclose(cf2); 1809 } 1810 free(ent); 1811 continue; 1812 } 1813 if (*p == '#') { 1814 p++; 1815 if (*p != '!' && *p != '+' && *p != '-') 1816 continue; 1817 } 1818 if (*p == '+' || *p == '-') { 1819 host[0] = *p++; 1820 while (isspace(*p)) 1821 p++; 1822 if ((!*p) || (*p == '*')) { 1823 (void)strlcpy(host, "*", sizeof(host)); 1824 continue; 1825 } 1826 if (*p == '@') 1827 p = LocalHostName; 1828 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 1829 if (!isalnum(*p) && *p != '.' && *p != '-' 1830 && *p != ',' && *p != ':' && *p != '%') 1831 break; 1832 host[i] = *p++; 1833 } 1834 host[i] = '\0'; 1835 continue; 1836 } 1837 if (*p == '!') { 1838 p++; 1839 while (isspace(*p)) p++; 1840 if ((!*p) || (*p == '*')) { 1841 (void)strlcpy(prog, "*", sizeof(prog)); 1842 continue; 1843 } 1844 for (i = 0; i < LINE_MAX - 1; i++) { 1845 if (!isprint(p[i]) || isspace(p[i])) 1846 break; 1847 prog[i] = p[i]; 1848 } 1849 prog[i] = 0; 1850 continue; 1851 } 1852 for (p = cline + 1; *p != '\0'; p++) { 1853 if (*p != '#') 1854 continue; 1855 if (*(p - 1) == '\\') { 1856 strcpy(p - 1, p); 1857 p--; 1858 continue; 1859 } 1860 *p = '\0'; 1861 break; 1862 } 1863 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 1864 cline[i] = '\0'; 1865 f = cfline(cline, prog, host); 1866 if (f != NULL) 1867 addfile(f); 1868 free(f); 1869 } 1870 } 1871 1872 static void 1873 sighandler(int signo) 1874 { 1875 1876 /* Send an wake-up signal to the select() loop. */ 1877 write(sigpipe[1], &signo, sizeof(signo)); 1878 } 1879 1880 /* 1881 * INIT -- Initialize syslogd from configuration table 1882 */ 1883 static void 1884 init(int signo) 1885 { 1886 int i; 1887 FILE *cf; 1888 struct filed *f; 1889 char *p; 1890 char oldLocalHostName[MAXHOSTNAMELEN]; 1891 char hostMsg[2*MAXHOSTNAMELEN+40]; 1892 char bootfileMsg[LINE_MAX]; 1893 1894 dprintf("init\n"); 1895 WantInitialize = 0; 1896 1897 /* 1898 * Load hostname (may have changed). 1899 */ 1900 if (signo != 0) 1901 (void)strlcpy(oldLocalHostName, LocalHostName, 1902 sizeof(oldLocalHostName)); 1903 if (gethostname(LocalHostName, sizeof(LocalHostName))) 1904 err(EX_OSERR, "gethostname() failed"); 1905 if ((p = strchr(LocalHostName, '.')) != NULL) { 1906 *p++ = '\0'; 1907 LocalDomain = p; 1908 } else { 1909 LocalDomain = ""; 1910 } 1911 1912 /* 1913 * Load / reload timezone data (in case it changed). 1914 * 1915 * Just calling tzset() again does not work, the timezone code 1916 * caches the result. However, by setting the TZ variable, one 1917 * can defeat the caching and have the timezone code really 1918 * reload the timezone data. Respect any initial setting of 1919 * TZ, in case the system is configured specially. 1920 */ 1921 dprintf("loading timezone data via tzset()\n"); 1922 if (getenv("TZ")) { 1923 tzset(); 1924 } else { 1925 setenv("TZ", ":/etc/localtime", 1); 1926 tzset(); 1927 unsetenv("TZ"); 1928 } 1929 1930 /* 1931 * Close all open log files. 1932 */ 1933 Initialized = 0; 1934 STAILQ_FOREACH(f, &fhead, next) { 1935 /* flush any pending output */ 1936 if (f->f_prevcount) 1937 fprintlog(f, 0, (char *)NULL); 1938 1939 switch (f->f_type) { 1940 case F_FILE: 1941 case F_FORW: 1942 case F_CONSOLE: 1943 case F_TTY: 1944 close_filed(f); 1945 break; 1946 case F_PIPE: 1947 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1948 close_filed(f); 1949 break; 1950 } 1951 } 1952 while(!STAILQ_EMPTY(&fhead)) { 1953 f = STAILQ_FIRST(&fhead); 1954 STAILQ_REMOVE_HEAD(&fhead, next); 1955 free(f->f_program); 1956 free(f->f_host); 1957 free(f); 1958 } 1959 1960 /* open the configuration file */ 1961 if ((cf = fopen(ConfFile, "r")) == NULL) { 1962 dprintf("cannot open %s\n", ConfFile); 1963 f = cfline("*.ERR\t/dev/console", "*", "*"); 1964 if (f != NULL) 1965 addfile(f); 1966 free(f); 1967 f = cfline("*.PANIC\t*", "*", "*"); 1968 if (f != NULL) 1969 addfile(f); 1970 free(f); 1971 Initialized = 1; 1972 1973 return; 1974 } 1975 1976 readconfigfile(cf, 1); 1977 1978 /* close the configuration file */ 1979 (void)fclose(cf); 1980 1981 Initialized = 1; 1982 1983 if (Debug) { 1984 int port; 1985 STAILQ_FOREACH(f, &fhead, next) { 1986 for (i = 0; i <= LOG_NFACILITIES; i++) 1987 if (f->f_pmask[i] == INTERNAL_NOPRI) 1988 printf("X "); 1989 else 1990 printf("%d ", f->f_pmask[i]); 1991 printf("%s: ", TypeNames[f->f_type]); 1992 switch (f->f_type) { 1993 case F_FILE: 1994 printf("%s", f->fu_fname); 1995 break; 1996 1997 case F_CONSOLE: 1998 case F_TTY: 1999 printf("%s%s", _PATH_DEV, f->fu_fname); 2000 break; 2001 2002 case F_FORW: 2003 switch (f->fu_forw_addr->ai_addr->sa_family) { 2004 #ifdef INET 2005 case AF_INET: 2006 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2007 break; 2008 #endif 2009 #ifdef INET6 2010 case AF_INET6: 2011 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2012 break; 2013 #endif 2014 default: 2015 port = 0; 2016 } 2017 if (port != 514) { 2018 printf("%s:%d", 2019 f->fu_forw_hname, port); 2020 } else { 2021 printf("%s", f->fu_forw_hname); 2022 } 2023 break; 2024 2025 case F_PIPE: 2026 printf("%s", f->fu_pipe_pname); 2027 break; 2028 2029 case F_USERS: 2030 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2031 printf("%s, ", f->fu_uname[i]); 2032 break; 2033 } 2034 if (f->f_program) 2035 printf(" (%s)", f->f_program); 2036 printf("\n"); 2037 } 2038 } 2039 2040 logmsg(LOG_SYSLOG|LOG_INFO, NULL, "syslogd: restart", LocalHostName, 0); 2041 dprintf("syslogd: restarted\n"); 2042 /* 2043 * Log a change in hostname, but only on a restart. 2044 */ 2045 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2046 (void)snprintf(hostMsg, sizeof(hostMsg), 2047 "syslogd: hostname changed, \"%s\" to \"%s\"", 2048 oldLocalHostName, LocalHostName); 2049 logmsg(LOG_SYSLOG|LOG_INFO, NULL, hostMsg, LocalHostName, 0); 2050 dprintf("%s\n", hostMsg); 2051 } 2052 /* 2053 * Log the kernel boot file if we aren't going to use it as 2054 * the prefix, and if this is *not* a restart. 2055 */ 2056 if (signo == 0 && !use_bootfile) { 2057 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2058 "syslogd: kernel boot file is %s", bootfile); 2059 logmsg(LOG_KERN|LOG_INFO, NULL, bootfileMsg, LocalHostName, 0); 2060 dprintf("%s\n", bootfileMsg); 2061 } 2062 } 2063 2064 /* 2065 * Crack a configuration file line 2066 */ 2067 static struct filed * 2068 cfline(const char *line, const char *prog, const char *host) 2069 { 2070 struct filed *f; 2071 struct addrinfo hints, *res; 2072 int error, i, pri, syncfile; 2073 const char *p, *q; 2074 char *bp; 2075 char buf[MAXLINE], ebuf[100]; 2076 2077 dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host); 2078 2079 f = calloc(1, sizeof(*f)); 2080 if (f == NULL) { 2081 logerror("malloc"); 2082 exit(1); 2083 } 2084 errno = 0; /* keep strerror() stuff out of logerror messages */ 2085 2086 for (i = 0; i <= LOG_NFACILITIES; i++) 2087 f->f_pmask[i] = INTERNAL_NOPRI; 2088 2089 /* save hostname if any */ 2090 if (host && *host == '*') 2091 host = NULL; 2092 if (host) { 2093 int hl; 2094 2095 f->f_host = strdup(host); 2096 if (f->f_host == NULL) { 2097 logerror("strdup"); 2098 exit(1); 2099 } 2100 hl = strlen(f->f_host); 2101 if (hl > 0 && f->f_host[hl-1] == '.') 2102 f->f_host[--hl] = '\0'; 2103 trimdomain(f->f_host, hl); 2104 } 2105 2106 /* save program name if any */ 2107 if (prog && *prog == '*') 2108 prog = NULL; 2109 if (prog) { 2110 f->f_program = strdup(prog); 2111 if (f->f_program == NULL) { 2112 logerror("strdup"); 2113 exit(1); 2114 } 2115 } 2116 2117 /* scan through the list of selectors */ 2118 for (p = line; *p && *p != '\t' && *p != ' ';) { 2119 int pri_done; 2120 int pri_cmp; 2121 int pri_invert; 2122 2123 /* find the end of this facility name list */ 2124 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2125 continue; 2126 2127 /* get the priority comparison */ 2128 pri_cmp = 0; 2129 pri_done = 0; 2130 pri_invert = 0; 2131 if (*q == '!') { 2132 pri_invert = 1; 2133 q++; 2134 } 2135 while (!pri_done) { 2136 switch (*q) { 2137 case '<': 2138 pri_cmp |= PRI_LT; 2139 q++; 2140 break; 2141 case '=': 2142 pri_cmp |= PRI_EQ; 2143 q++; 2144 break; 2145 case '>': 2146 pri_cmp |= PRI_GT; 2147 q++; 2148 break; 2149 default: 2150 pri_done++; 2151 break; 2152 } 2153 } 2154 2155 /* collect priority name */ 2156 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2157 *bp++ = *q++; 2158 *bp = '\0'; 2159 2160 /* skip cruft */ 2161 while (strchr(",;", *q)) 2162 q++; 2163 2164 /* decode priority name */ 2165 if (*buf == '*') { 2166 pri = LOG_PRIMASK; 2167 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2168 } else { 2169 /* Ignore trailing spaces. */ 2170 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2171 buf[i] = '\0'; 2172 2173 pri = decode(buf, prioritynames); 2174 if (pri < 0) { 2175 errno = 0; 2176 (void)snprintf(ebuf, sizeof ebuf, 2177 "unknown priority name \"%s\"", buf); 2178 logerror(ebuf); 2179 free(f); 2180 return (NULL); 2181 } 2182 } 2183 if (!pri_cmp) 2184 pri_cmp = (UniquePriority) 2185 ? (PRI_EQ) 2186 : (PRI_EQ | PRI_GT) 2187 ; 2188 if (pri_invert) 2189 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2190 2191 /* scan facilities */ 2192 while (*p && !strchr("\t.; ", *p)) { 2193 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2194 *bp++ = *p++; 2195 *bp = '\0'; 2196 2197 if (*buf == '*') { 2198 for (i = 0; i < LOG_NFACILITIES; i++) { 2199 f->f_pmask[i] = pri; 2200 f->f_pcmp[i] = pri_cmp; 2201 } 2202 } else { 2203 i = decode(buf, facilitynames); 2204 if (i < 0) { 2205 errno = 0; 2206 (void)snprintf(ebuf, sizeof ebuf, 2207 "unknown facility name \"%s\"", 2208 buf); 2209 logerror(ebuf); 2210 free(f); 2211 return (NULL); 2212 } 2213 f->f_pmask[i >> 3] = pri; 2214 f->f_pcmp[i >> 3] = pri_cmp; 2215 } 2216 while (*p == ',' || *p == ' ') 2217 p++; 2218 } 2219 2220 p = q; 2221 } 2222 2223 /* skip to action part */ 2224 while (*p == '\t' || *p == ' ') 2225 p++; 2226 2227 if (*p == '-') { 2228 syncfile = 0; 2229 p++; 2230 } else 2231 syncfile = 1; 2232 2233 switch (*p) { 2234 case '@': 2235 { 2236 char *tp; 2237 char endkey = ':'; 2238 /* 2239 * scan forward to see if there is a port defined. 2240 * so we can't use strlcpy.. 2241 */ 2242 i = sizeof(f->fu_forw_hname); 2243 tp = f->fu_forw_hname; 2244 p++; 2245 2246 /* 2247 * an ipv6 address should start with a '[' in that case 2248 * we should scan for a ']' 2249 */ 2250 if (*p == '[') { 2251 p++; 2252 endkey = ']'; 2253 } 2254 while (*p && (*p != endkey) && (i-- > 0)) { 2255 *tp++ = *p++; 2256 } 2257 if (endkey == ']' && *p == endkey) 2258 p++; 2259 *tp = '\0'; 2260 } 2261 /* See if we copied a domain and have a port */ 2262 if (*p == ':') 2263 p++; 2264 else 2265 p = NULL; 2266 2267 hints = (struct addrinfo){ 2268 .ai_family = family, 2269 .ai_socktype = SOCK_DGRAM 2270 }; 2271 error = getaddrinfo(f->fu_forw_hname, 2272 p ? p : "syslog", &hints, &res); 2273 if (error) { 2274 logerror(gai_strerror(error)); 2275 break; 2276 } 2277 f->fu_forw_addr = res; 2278 f->f_type = F_FORW; 2279 break; 2280 2281 case '/': 2282 if ((f->f_file = open(p, logflags, 0600)) < 0) { 2283 f->f_type = F_UNUSED; 2284 logerror(p); 2285 break; 2286 } 2287 if (syncfile) 2288 f->f_flags |= FFLAG_SYNC; 2289 if (isatty(f->f_file)) { 2290 if (strcmp(p, ctty) == 0) 2291 f->f_type = F_CONSOLE; 2292 else 2293 f->f_type = F_TTY; 2294 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 2295 sizeof(f->fu_fname)); 2296 } else { 2297 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 2298 f->f_type = F_FILE; 2299 } 2300 break; 2301 2302 case '|': 2303 f->fu_pipe_pid = 0; 2304 (void)strlcpy(f->fu_pipe_pname, p + 1, 2305 sizeof(f->fu_pipe_pname)); 2306 f->f_type = F_PIPE; 2307 break; 2308 2309 case '*': 2310 f->f_type = F_WALL; 2311 break; 2312 2313 default: 2314 for (i = 0; i < MAXUNAMES && *p; i++) { 2315 for (q = p; *q && *q != ','; ) 2316 q++; 2317 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 2318 if ((q - p) >= MAXLOGNAME) 2319 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 2320 else 2321 f->fu_uname[i][q - p] = '\0'; 2322 while (*q == ',' || *q == ' ') 2323 q++; 2324 p = q; 2325 } 2326 f->f_type = F_USERS; 2327 break; 2328 } 2329 return (f); 2330 } 2331 2332 2333 /* 2334 * Decode a symbolic name to a numeric value 2335 */ 2336 static int 2337 decode(const char *name, const CODE *codetab) 2338 { 2339 const CODE *c; 2340 char *p, buf[40]; 2341 2342 if (isdigit(*name)) 2343 return (atoi(name)); 2344 2345 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 2346 if (isupper(*name)) 2347 *p = tolower(*name); 2348 else 2349 *p = *name; 2350 } 2351 *p = '\0'; 2352 for (c = codetab; c->c_name; c++) 2353 if (!strcmp(buf, c->c_name)) 2354 return (c->c_val); 2355 2356 return (-1); 2357 } 2358 2359 static void 2360 markit(void) 2361 { 2362 struct filed *f; 2363 struct deadq_entry *dq, *dq0; 2364 2365 now = time((time_t *)NULL); 2366 MarkSeq += TIMERINTVL; 2367 if (MarkSeq >= MarkInterval) { 2368 logmsg(LOG_INFO, NULL, "-- MARK --", LocalHostName, MARK); 2369 MarkSeq = 0; 2370 } 2371 2372 STAILQ_FOREACH(f, &fhead, next) { 2373 if (f->f_prevcount && now >= REPEATTIME(f)) { 2374 dprintf("flush %s: repeated %d times, %d sec.\n", 2375 TypeNames[f->f_type], f->f_prevcount, 2376 repeatinterval[f->f_repeatcount]); 2377 fprintlog(f, 0, (char *)NULL); 2378 BACKOFF(f); 2379 } 2380 } 2381 2382 /* Walk the dead queue, and see if we should signal somebody. */ 2383 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 2384 switch (dq->dq_timeout) { 2385 case 0: 2386 /* Already signalled once, try harder now. */ 2387 if (kill(dq->dq_pid, SIGKILL) != 0) 2388 (void)deadq_remove(dq); 2389 break; 2390 2391 case 1: 2392 /* 2393 * Timed out on dead queue, send terminate 2394 * signal. Note that we leave the removal 2395 * from the dead queue to reapchild(), which 2396 * will also log the event (unless the process 2397 * didn't even really exist, in case we simply 2398 * drop it from the dead queue). 2399 */ 2400 if (kill(dq->dq_pid, SIGTERM) != 0) 2401 (void)deadq_remove(dq); 2402 else 2403 dq->dq_timeout--; 2404 break; 2405 default: 2406 dq->dq_timeout--; 2407 } 2408 } 2409 MarkSet = 0; 2410 (void)alarm(TIMERINTVL); 2411 } 2412 2413 /* 2414 * fork off and become a daemon, but wait for the child to come online 2415 * before returning to the parent, or we get disk thrashing at boot etc. 2416 * Set a timer so we don't hang forever if it wedges. 2417 */ 2418 static int 2419 waitdaemon(int maxwait) 2420 { 2421 int fd; 2422 int status; 2423 pid_t pid, childpid; 2424 2425 switch (childpid = fork()) { 2426 case -1: 2427 return (-1); 2428 case 0: 2429 break; 2430 default: 2431 signal(SIGALRM, timedout); 2432 alarm(maxwait); 2433 while ((pid = wait3(&status, 0, NULL)) != -1) { 2434 if (WIFEXITED(status)) 2435 errx(1, "child pid %d exited with return code %d", 2436 pid, WEXITSTATUS(status)); 2437 if (WIFSIGNALED(status)) 2438 errx(1, "child pid %d exited on signal %d%s", 2439 pid, WTERMSIG(status), 2440 WCOREDUMP(status) ? " (core dumped)" : 2441 ""); 2442 if (pid == childpid) /* it's gone... */ 2443 break; 2444 } 2445 exit(0); 2446 } 2447 2448 if (setsid() == -1) 2449 return (-1); 2450 2451 (void)chdir("/"); 2452 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 2453 (void)dup2(fd, STDIN_FILENO); 2454 (void)dup2(fd, STDOUT_FILENO); 2455 (void)dup2(fd, STDERR_FILENO); 2456 if (fd > STDERR_FILENO) 2457 (void)close(fd); 2458 } 2459 return (getppid()); 2460 } 2461 2462 /* 2463 * We get a SIGALRM from the child when it's running and finished doing it's 2464 * fsync()'s or O_SYNC writes for all the boot messages. 2465 * 2466 * We also get a signal from the kernel if the timer expires, so check to 2467 * see what happened. 2468 */ 2469 static void 2470 timedout(int sig __unused) 2471 { 2472 int left; 2473 left = alarm(0); 2474 signal(SIGALRM, SIG_DFL); 2475 if (left == 0) 2476 errx(1, "timed out waiting for child"); 2477 else 2478 _exit(0); 2479 } 2480 2481 /* 2482 * Add `s' to the list of allowable peer addresses to accept messages 2483 * from. 2484 * 2485 * `s' is a string in the form: 2486 * 2487 * [*]domainname[:{servicename|portnumber|*}] 2488 * 2489 * or 2490 * 2491 * netaddr/maskbits[:{servicename|portnumber|*}] 2492 * 2493 * Returns -1 on error, 0 if the argument was valid. 2494 */ 2495 static int 2496 allowaddr(char *s) 2497 { 2498 #if defined(INET) || defined(INET6) 2499 char *cp1, *cp2; 2500 struct allowedpeer *ap; 2501 struct servent *se; 2502 int masklen = -1; 2503 struct addrinfo hints, *res = NULL; 2504 #ifdef INET 2505 in_addr_t *addrp, *maskp; 2506 #endif 2507 #ifdef INET6 2508 uint32_t *addr6p, *mask6p; 2509 #endif 2510 char ip[NI_MAXHOST]; 2511 2512 ap = calloc(1, sizeof(*ap)); 2513 if (ap == NULL) 2514 err(1, "malloc failed"); 2515 2516 #ifdef INET6 2517 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 2518 #endif 2519 cp1 = s; 2520 if ((cp1 = strrchr(cp1, ':'))) { 2521 /* service/port provided */ 2522 *cp1++ = '\0'; 2523 if (strlen(cp1) == 1 && *cp1 == '*') 2524 /* any port allowed */ 2525 ap->port = 0; 2526 else if ((se = getservbyname(cp1, "udp"))) { 2527 ap->port = ntohs(se->s_port); 2528 } else { 2529 ap->port = strtol(cp1, &cp2, 0); 2530 /* port not numeric */ 2531 if (*cp2 != '\0') 2532 goto err; 2533 } 2534 } else { 2535 if ((se = getservbyname("syslog", "udp"))) 2536 ap->port = ntohs(se->s_port); 2537 else 2538 /* sanity, should not happen */ 2539 ap->port = 514; 2540 } 2541 2542 if ((cp1 = strchr(s, '/')) != NULL && 2543 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 2544 *cp1 = '\0'; 2545 if ((masklen = atoi(cp1 + 1)) < 0) 2546 goto err; 2547 } 2548 #ifdef INET6 2549 if (*s == '[') { 2550 cp2 = s + strlen(s) - 1; 2551 if (*cp2 == ']') { 2552 ++s; 2553 *cp2 = '\0'; 2554 } else { 2555 cp2 = NULL; 2556 } 2557 } else { 2558 cp2 = NULL; 2559 } 2560 #endif 2561 hints = (struct addrinfo){ 2562 .ai_family = PF_UNSPEC, 2563 .ai_socktype = SOCK_DGRAM, 2564 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2565 }; 2566 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 2567 ap->isnumeric = 1; 2568 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 2569 ap->a_mask = (struct sockaddr_storage){ 2570 .ss_family = res->ai_family, 2571 .ss_len = res->ai_addrlen 2572 }; 2573 switch (res->ai_family) { 2574 #ifdef INET 2575 case AF_INET: 2576 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 2577 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 2578 if (masklen < 0) { 2579 /* use default netmask */ 2580 if (IN_CLASSA(ntohl(*addrp))) 2581 *maskp = htonl(IN_CLASSA_NET); 2582 else if (IN_CLASSB(ntohl(*addrp))) 2583 *maskp = htonl(IN_CLASSB_NET); 2584 else 2585 *maskp = htonl(IN_CLASSC_NET); 2586 } else if (masklen == 0) { 2587 *maskp = 0; 2588 } else if (masklen <= 32) { 2589 /* convert masklen to netmask */ 2590 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 2591 } else { 2592 goto err; 2593 } 2594 /* Lose any host bits in the network number. */ 2595 *addrp &= *maskp; 2596 break; 2597 #endif 2598 #ifdef INET6 2599 case AF_INET6: 2600 if (masklen > 128) 2601 goto err; 2602 2603 if (masklen < 0) 2604 masklen = 128; 2605 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 2606 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 2607 /* convert masklen to netmask */ 2608 while (masklen > 0) { 2609 if (masklen < 32) { 2610 *mask6p = 2611 htonl(~(0xffffffff >> masklen)); 2612 *addr6p &= *mask6p; 2613 break; 2614 } else { 2615 *mask6p++ = 0xffffffff; 2616 addr6p++; 2617 masklen -= 32; 2618 } 2619 } 2620 break; 2621 #endif 2622 default: 2623 goto err; 2624 } 2625 freeaddrinfo(res); 2626 } else { 2627 /* arg `s' is domain name */ 2628 ap->isnumeric = 0; 2629 ap->a_name = s; 2630 if (cp1) 2631 *cp1 = '/'; 2632 #ifdef INET6 2633 if (cp2) { 2634 *cp2 = ']'; 2635 --s; 2636 } 2637 #endif 2638 } 2639 STAILQ_INSERT_TAIL(&aphead, ap, next); 2640 2641 if (Debug) { 2642 printf("allowaddr: rule "); 2643 if (ap->isnumeric) { 2644 printf("numeric, "); 2645 getnameinfo(sstosa(&ap->a_addr), 2646 (sstosa(&ap->a_addr))->sa_len, 2647 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2648 printf("addr = %s, ", ip); 2649 getnameinfo(sstosa(&ap->a_mask), 2650 (sstosa(&ap->a_mask))->sa_len, 2651 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 2652 printf("mask = %s; ", ip); 2653 } else { 2654 printf("domainname = %s; ", ap->a_name); 2655 } 2656 printf("port = %d\n", ap->port); 2657 } 2658 #endif 2659 2660 return (0); 2661 err: 2662 if (res != NULL) 2663 freeaddrinfo(res); 2664 free(ap); 2665 return (-1); 2666 } 2667 2668 /* 2669 * Validate that the remote peer has permission to log to us. 2670 */ 2671 static int 2672 validate(struct sockaddr *sa, const char *hname) 2673 { 2674 int i; 2675 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 2676 struct allowedpeer *ap; 2677 #ifdef INET 2678 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 2679 #endif 2680 #ifdef INET6 2681 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 2682 #endif 2683 struct addrinfo hints, *res; 2684 u_short sport; 2685 int num = 0; 2686 2687 STAILQ_FOREACH(ap, &aphead, next) { 2688 num++; 2689 } 2690 dprintf("# of validation rule: %d\n", num); 2691 if (num == 0) 2692 /* traditional behaviour, allow everything */ 2693 return (1); 2694 2695 (void)strlcpy(name, hname, sizeof(name)); 2696 hints = (struct addrinfo){ 2697 .ai_family = PF_UNSPEC, 2698 .ai_socktype = SOCK_DGRAM, 2699 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 2700 }; 2701 if (getaddrinfo(name, NULL, &hints, &res) == 0) 2702 freeaddrinfo(res); 2703 else if (strchr(name, '.') == NULL) { 2704 strlcat(name, ".", sizeof name); 2705 strlcat(name, LocalDomain, sizeof name); 2706 } 2707 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 2708 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 2709 return (0); /* for safety, should not occur */ 2710 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 2711 ip, port, name); 2712 sport = atoi(port); 2713 2714 /* now, walk down the list */ 2715 i = 0; 2716 STAILQ_FOREACH(ap, &aphead, next) { 2717 i++; 2718 if (ap->port != 0 && ap->port != sport) { 2719 dprintf("rejected in rule %d due to port mismatch.\n", 2720 i); 2721 continue; 2722 } 2723 2724 if (ap->isnumeric) { 2725 if (ap->a_addr.ss_family != sa->sa_family) { 2726 dprintf("rejected in rule %d due to address family mismatch.\n", i); 2727 continue; 2728 } 2729 #ifdef INET 2730 else if (ap->a_addr.ss_family == AF_INET) { 2731 sin4 = satosin(sa); 2732 a4p = satosin(&ap->a_addr); 2733 m4p = satosin(&ap->a_mask); 2734 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 2735 != a4p->sin_addr.s_addr) { 2736 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2737 continue; 2738 } 2739 } 2740 #endif 2741 #ifdef INET6 2742 else if (ap->a_addr.ss_family == AF_INET6) { 2743 sin6 = satosin6(sa); 2744 a6p = satosin6(&ap->a_addr); 2745 m6p = satosin6(&ap->a_mask); 2746 if (a6p->sin6_scope_id != 0 && 2747 sin6->sin6_scope_id != a6p->sin6_scope_id) { 2748 dprintf("rejected in rule %d due to scope mismatch.\n", i); 2749 continue; 2750 } 2751 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 2752 &a6p->sin6_addr, &m6p->sin6_addr) != 0) { 2753 dprintf("rejected in rule %d due to IP mismatch.\n", i); 2754 continue; 2755 } 2756 } 2757 #endif 2758 else 2759 continue; 2760 } else { 2761 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 2762 FNM_NOMATCH) { 2763 dprintf("rejected in rule %d due to name " 2764 "mismatch.\n", i); 2765 continue; 2766 } 2767 } 2768 dprintf("accepted in rule %d.\n", i); 2769 return (1); /* hooray! */ 2770 } 2771 return (0); 2772 } 2773 2774 /* 2775 * Fairly similar to popen(3), but returns an open descriptor, as 2776 * opposed to a FILE *. 2777 */ 2778 static int 2779 p_open(const char *prog, pid_t *rpid) 2780 { 2781 int pfd[2], nulldesc; 2782 pid_t pid; 2783 char *argv[4]; /* sh -c cmd NULL */ 2784 char errmsg[200]; 2785 2786 if (pipe(pfd) == -1) 2787 return (-1); 2788 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 2789 /* we are royally screwed anyway */ 2790 return (-1); 2791 2792 switch ((pid = fork())) { 2793 case -1: 2794 close(nulldesc); 2795 return (-1); 2796 2797 case 0: 2798 (void)setsid(); /* Avoid catching SIGHUPs. */ 2799 argv[0] = strdup("sh"); 2800 argv[1] = strdup("-c"); 2801 argv[2] = strdup(prog); 2802 argv[3] = NULL; 2803 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 2804 logerror("strdup"); 2805 exit(1); 2806 } 2807 2808 alarm(0); 2809 2810 /* Restore signals marked as SIG_IGN. */ 2811 (void)signal(SIGINT, SIG_DFL); 2812 (void)signal(SIGQUIT, SIG_DFL); 2813 (void)signal(SIGPIPE, SIG_DFL); 2814 2815 dup2(pfd[0], STDIN_FILENO); 2816 dup2(nulldesc, STDOUT_FILENO); 2817 dup2(nulldesc, STDERR_FILENO); 2818 closefrom(STDERR_FILENO + 1); 2819 2820 (void)execvp(_PATH_BSHELL, argv); 2821 _exit(255); 2822 } 2823 close(nulldesc); 2824 close(pfd[0]); 2825 /* 2826 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 2827 * supposed to get an EWOULDBLOCK on writev(2), which is 2828 * caught by the logic above anyway, which will in turn close 2829 * the pipe, and fork a new logging subprocess if necessary. 2830 * The stale subprocess will be killed some time later unless 2831 * it terminated itself due to closing its input pipe (so we 2832 * get rid of really dead puppies). 2833 */ 2834 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 2835 /* This is bad. */ 2836 (void)snprintf(errmsg, sizeof errmsg, 2837 "Warning: cannot change pipe to PID %d to " 2838 "non-blocking behaviour.", 2839 (int)pid); 2840 logerror(errmsg); 2841 } 2842 *rpid = pid; 2843 return (pfd[1]); 2844 } 2845 2846 static void 2847 deadq_enter(pid_t pid, const char *name) 2848 { 2849 struct deadq_entry *dq; 2850 int status; 2851 2852 if (pid == 0) 2853 return; 2854 /* 2855 * Be paranoid, if we can't signal the process, don't enter it 2856 * into the dead queue (perhaps it's already dead). If possible, 2857 * we try to fetch and log the child's status. 2858 */ 2859 if (kill(pid, 0) != 0) { 2860 if (waitpid(pid, &status, WNOHANG) > 0) 2861 log_deadchild(pid, status, name); 2862 return; 2863 } 2864 2865 dq = malloc(sizeof(*dq)); 2866 if (dq == NULL) { 2867 logerror("malloc"); 2868 exit(1); 2869 } 2870 *dq = (struct deadq_entry){ 2871 .dq_pid = pid, 2872 .dq_timeout = DQ_TIMO_INIT 2873 }; 2874 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 2875 } 2876 2877 static int 2878 deadq_remove(struct deadq_entry *dq) 2879 { 2880 if (dq != NULL) { 2881 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 2882 free(dq); 2883 return (1); 2884 } 2885 2886 return (0); 2887 } 2888 2889 static int 2890 deadq_removebypid(pid_t pid) 2891 { 2892 struct deadq_entry *dq; 2893 2894 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 2895 if (dq->dq_pid == pid) 2896 break; 2897 } 2898 return (deadq_remove(dq)); 2899 } 2900 2901 static void 2902 log_deadchild(pid_t pid, int status, const char *name) 2903 { 2904 int code; 2905 char buf[256]; 2906 const char *reason; 2907 2908 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 2909 if (WIFSIGNALED(status)) { 2910 reason = "due to signal"; 2911 code = WTERMSIG(status); 2912 } else { 2913 reason = "with status"; 2914 code = WEXITSTATUS(status); 2915 if (code == 0) 2916 return; 2917 } 2918 (void)snprintf(buf, sizeof buf, 2919 "Logging subprocess %d (%s) exited %s %d.", 2920 pid, name, reason, code); 2921 logerror(buf); 2922 } 2923 2924 static int 2925 socksetup(struct peer *pe) 2926 { 2927 struct addrinfo hints, *res, *res0; 2928 int error; 2929 char *cp; 2930 int (*sl_recv)(struct socklist *); 2931 /* 2932 * We have to handle this case for backwards compatibility: 2933 * If there are two (or more) colons but no '[' and ']', 2934 * assume this is an inet6 address without a service. 2935 */ 2936 if (pe->pe_name != NULL) { 2937 #ifdef INET6 2938 if (pe->pe_name[0] == '[' && 2939 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 2940 pe->pe_name = &pe->pe_name[1]; 2941 *cp = '\0'; 2942 if (cp[1] == ':' && cp[2] != '\0') 2943 pe->pe_serv = cp + 2; 2944 } else { 2945 #endif 2946 cp = strchr(pe->pe_name, ':'); 2947 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 2948 *cp = '\0'; 2949 if (cp[1] != '\0') 2950 pe->pe_serv = cp + 1; 2951 if (cp == pe->pe_name) 2952 pe->pe_name = NULL; 2953 } 2954 #ifdef INET6 2955 } 2956 #endif 2957 } 2958 hints = (struct addrinfo){ 2959 .ai_family = AF_UNSPEC, 2960 .ai_socktype = SOCK_DGRAM, 2961 .ai_flags = AI_PASSIVE 2962 }; 2963 if (pe->pe_name != NULL) 2964 dprintf("Trying peer: %s\n", pe->pe_name); 2965 if (pe->pe_serv == NULL) 2966 pe->pe_serv = "syslog"; 2967 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 2968 if (error) { 2969 char *msgbuf; 2970 2971 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 2972 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 2973 gai_strerror(error)); 2974 errno = 0; 2975 if (msgbuf == NULL) 2976 logerror(gai_strerror(error)); 2977 else 2978 logerror(msgbuf); 2979 free(msgbuf); 2980 die(0); 2981 } 2982 for (res = res0; res != NULL; res = res->ai_next) { 2983 int s; 2984 2985 if (res->ai_family != AF_LOCAL && 2986 SecureMode > 1) { 2987 /* Only AF_LOCAL in secure mode. */ 2988 continue; 2989 } 2990 if (family != AF_UNSPEC && 2991 res->ai_family != AF_LOCAL && res->ai_family != family) 2992 continue; 2993 2994 s = socket(res->ai_family, res->ai_socktype, 2995 res->ai_protocol); 2996 if (s < 0) { 2997 logerror("socket"); 2998 error++; 2999 continue; 3000 } 3001 #ifdef INET6 3002 if (res->ai_family == AF_INET6) { 3003 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 3004 &(int){1}, sizeof(int)) < 0) { 3005 logerror("setsockopt(IPV6_V6ONLY)"); 3006 close(s); 3007 error++; 3008 continue; 3009 } 3010 } 3011 #endif 3012 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 3013 &(int){1}, sizeof(int)) < 0) { 3014 logerror("setsockopt(SO_REUSEADDR)"); 3015 close(s); 3016 error++; 3017 continue; 3018 } 3019 3020 /* 3021 * Bind INET and UNIX-domain sockets. 3022 * 3023 * A UNIX-domain socket is always bound to a pathname 3024 * regardless of -N flag. 3025 * 3026 * For INET sockets, RFC 3164 recommends that client 3027 * side message should come from the privileged syslogd port. 3028 * 3029 * If the system administrator chooses not to obey 3030 * this, we can skip the bind() step so that the 3031 * system will choose a port for us. 3032 */ 3033 if (res->ai_family == AF_LOCAL) 3034 unlink(pe->pe_name); 3035 if (res->ai_family == AF_LOCAL || 3036 NoBind == 0 || pe->pe_name != NULL) { 3037 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3038 logerror("bind"); 3039 close(s); 3040 error++; 3041 continue; 3042 } 3043 if (res->ai_family == AF_LOCAL || 3044 SecureMode == 0) 3045 increase_rcvbuf(s); 3046 } 3047 if (res->ai_family == AF_LOCAL && 3048 chmod(pe->pe_name, pe->pe_mode) < 0) { 3049 dprintf("chmod %s: %s\n", pe->pe_name, 3050 strerror(errno)); 3051 close(s); 3052 error++; 3053 continue; 3054 } 3055 dprintf("new socket fd is %d\n", s); 3056 if (res->ai_socktype != SOCK_DGRAM) { 3057 listen(s, 5); 3058 } 3059 sl_recv = socklist_recv_sock; 3060 #if defined(INET) || defined(INET6) 3061 if (SecureMode && (res->ai_family == AF_INET || 3062 res->ai_family == AF_INET6)) { 3063 dprintf("shutdown\n"); 3064 /* Forbid communication in secure mode. */ 3065 if (shutdown(s, SHUT_RD) < 0 && 3066 errno != ENOTCONN) { 3067 logerror("shutdown"); 3068 if (!Debug) 3069 die(0); 3070 } 3071 sl_recv = NULL; 3072 } else 3073 #endif 3074 dprintf("listening on socket\n"); 3075 dprintf("sending on socket\n"); 3076 addsock(res->ai_addr, res->ai_addrlen, 3077 &(struct socklist){ 3078 .sl_socket = s, 3079 .sl_peer = pe, 3080 .sl_recv = sl_recv 3081 }); 3082 } 3083 freeaddrinfo(res0); 3084 3085 return(error); 3086 } 3087 3088 static void 3089 increase_rcvbuf(int fd) 3090 { 3091 socklen_t len; 3092 3093 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3094 &(socklen_t){sizeof(len)}) == 0) { 3095 if (len < RCVBUF_MINSIZE) { 3096 len = RCVBUF_MINSIZE; 3097 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3098 } 3099 } 3100 } 3101