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 * SPDX-License-Identifier: BSD-2-Clause 33 * 34 * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/ 35 * Author: Ed Schouten <ed@FreeBSD.org> 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 */ 58 59 /* 60 * syslogd -- log system messages 61 * 62 * This program implements a system log. It takes a series of lines. 63 * Each line may have a priority, signified as "<n>" as 64 * the first characters of the line. If this is 65 * not present, a default priority is used. 66 * 67 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 68 * cause it to reread its configuration file. 69 * 70 * Defined Constants: 71 * 72 * MAXLINE -- the maximum line length that can be handled. 73 * DEFUPRI -- the default priority for user messages 74 * DEFSPRI -- the default priority for kernel messages 75 * 76 * Author: Eric Allman 77 * extensive changes by Ralph Campbell 78 * more extensive changes by Eric Allman (again) 79 * Extension to log by program name as well as facility and priority 80 * by Peter da Silva. 81 * -u and -v by Harlan Stenn. 82 * Priority comparison code by Harlan Stenn. 83 */ 84 85 #define MAXLINE 8192 /* maximum line length */ 86 #define MAXSVLINE MAXLINE /* maximum saved line length */ 87 #define DEFUPRI (LOG_USER|LOG_NOTICE) 88 #define DEFSPRI (LOG_KERN|LOG_CRIT) 89 #define TIMERINTVL 30 /* interval for checking flush, mark */ 90 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 91 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 92 93 #include <sys/param.h> 94 #include <sys/event.h> 95 #include <sys/ioctl.h> 96 #include <sys/mman.h> 97 #include <sys/procdesc.h> 98 #include <sys/queue.h> 99 #include <sys/resource.h> 100 #include <sys/socket.h> 101 #include <sys/stat.h> 102 #include <sys/syslimits.h> 103 #include <sys/time.h> 104 #include <sys/uio.h> 105 #include <sys/un.h> 106 #include <sys/wait.h> 107 108 #if defined(INET) || defined(INET6) 109 #include <netinet/in.h> 110 #include <arpa/inet.h> 111 #endif 112 113 #include <assert.h> 114 #include <ctype.h> 115 #include <dirent.h> 116 #include <err.h> 117 #include <errno.h> 118 #include <fcntl.h> 119 #include <fnmatch.h> 120 #include <libgen.h> 121 #include <libutil.h> 122 #include <limits.h> 123 #include <netdb.h> 124 #include <paths.h> 125 #include <poll.h> 126 #include <regex.h> 127 #include <signal.h> 128 #include <stdbool.h> 129 #include <stddef.h> 130 #include <stdio.h> 131 #include <stdlib.h> 132 #include <string.h> 133 #include <sysexits.h> 134 #include <unistd.h> 135 #include <utmpx.h> 136 137 #include "pathnames.h" 138 #include "ttymsg.h" 139 140 #define SYSLOG_NAMES 141 #include <sys/syslog.h> 142 143 static const char *ConfFile = _PATH_LOGCONF; 144 static const char *PidFile = _PATH_LOGPID; 145 static const char include_str[] = "include"; 146 static const char include_ext[] = ".conf"; 147 148 #define dprintf if (Debug) printf 149 150 #define MAXUNAMES 20 /* maximum number of user names */ 151 152 #define sstosa(ss) ((struct sockaddr *)(ss)) 153 #ifdef INET 154 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 155 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 156 #endif 157 #ifdef INET6 158 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 159 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 160 #define s6_addr32 __u6_addr.__u6_addr32 161 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 162 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 163 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 164 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 165 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 166 #endif 167 168 /* 169 * List of peers and sockets that can't be bound until 170 * flags have been parsed. 171 */ 172 struct peer { 173 const char *pe_name; 174 const char *pe_serv; 175 mode_t pe_mode; 176 STAILQ_ENTRY(peer) next; 177 }; 178 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 179 180 /* 181 * Sockets used for logging; monitored by kevent(). 182 */ 183 struct socklist { 184 struct addrinfo sl_ai; 185 #define sl_sa sl_ai.ai_addr 186 #define sl_salen sl_ai.ai_addrlen 187 #define sl_family sl_ai.ai_family 188 int sl_socket; 189 char *sl_name; 190 int sl_dirfd; 191 int (*sl_recv)(struct socklist *); 192 STAILQ_ENTRY(socklist) next; 193 }; 194 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 195 196 /* 197 * Flags to logmsg(). 198 */ 199 200 #define IGN_CONS 0x001 /* don't print on console */ 201 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 202 #define MARK 0x008 /* this message is a mark */ 203 #define ISKERNEL 0x010 /* kernel generated message */ 204 205 /* Timestamps of log entries. */ 206 struct logtime { 207 struct tm tm; 208 suseconds_t usec; 209 }; 210 211 /* Traditional syslog timestamp format. */ 212 #define RFC3164_DATELEN 15 213 #define RFC3164_DATEFMT "%b %e %H:%M:%S" 214 215 enum filt_proptype { 216 FILT_PROP_NOOP, 217 FILT_PROP_MSG, 218 FILT_PROP_HOSTNAME, 219 FILT_PROP_PROGNAME, 220 }; 221 222 enum filt_cmptype { 223 FILT_CMP_CONTAINS, 224 FILT_CMP_EQUAL, 225 FILT_CMP_STARTS, 226 FILT_CMP_REGEX, 227 }; 228 229 /* 230 * This structure holds a property-based filter 231 */ 232 struct prop_filter { 233 enum filt_proptype prop_type; 234 enum filt_cmptype cmp_type; 235 uint8_t cmp_flags; 236 #define FILT_FLAG_EXCLUDE (1 << 0) 237 #define FILT_FLAG_ICASE (1 << 1) 238 union { 239 char *p_strval; 240 regex_t *p_re; 241 } pflt_uniptr; 242 #define pflt_strval pflt_uniptr.p_strval 243 #define pflt_re pflt_uniptr.p_re 244 size_t pflt_strlen; 245 }; 246 247 enum f_type { 248 F_UNUSED, /* unused entry */ 249 F_FILE, /* regular file */ 250 F_TTY, /* terminal */ 251 F_CONSOLE, /* console terminal */ 252 F_FORW, /* remote machine */ 253 F_USERS, /* list of users */ 254 F_WALL, /* everyone logged on */ 255 F_PIPE, /* pipe to program */ 256 }; 257 258 /* 259 * This structure represents the files that will have log 260 * copies printed. 261 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 262 * or if f_type is F_PIPE and f_pid > 0. 263 */ 264 struct filed { 265 enum f_type f_type; 266 267 /* Used for filtering. */ 268 char *f_host; /* host from which to recd. */ 269 char *f_program; /* program this applies to */ 270 struct prop_filter *f_prop_filter; /* property-based filter */ 271 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 272 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 273 #define PRI_LT 0x1 274 #define PRI_EQ 0x2 275 #define PRI_GT 0x4 276 277 /* Logging destinations. */ 278 int f_file; /* file descriptor */ 279 int f_flags; /* file-specific flags */ 280 #define FFLAG_SYNC 0x01 281 #define FFLAG_NEEDSYNC 0x02 282 union { 283 char f_uname[MAXUNAMES][MAXLOGNAME]; /* F_WALL, F_USERS */ 284 char f_fname[MAXPATHLEN]; /* F_FILE, F_CONSOLE, F_TTY */ 285 struct { 286 char f_hname[MAXHOSTNAMELEN]; 287 struct addrinfo *f_addr; 288 } f_forw; /* F_FORW */ 289 struct { 290 char f_pname[MAXPATHLEN]; 291 int f_procdesc; 292 } f_pipe; /* F_PIPE */ 293 } f_un; 294 #define fu_uname f_un.f_uname 295 #define fu_fname f_un.f_fname 296 #define fu_forw_hname f_un.f_forw.f_hname 297 #define fu_forw_addr f_un.f_forw.f_addr 298 #define fu_pipe_pname f_un.f_pipe.f_pname 299 #define fu_pipe_pd f_un.f_pipe.f_procdesc 300 301 /* Book-keeping. */ 302 char f_prevline[MAXSVLINE]; /* last message logged */ 303 time_t f_time; /* time this was last written */ 304 struct logtime f_lasttime; /* time of last occurrence */ 305 int f_prevpri; /* pri of f_prevline */ 306 size_t f_prevlen; /* length of f_prevline */ 307 int f_prevcount; /* repetition cnt of prevline */ 308 u_int f_repeatcount; /* number of "repeated" msgs */ 309 STAILQ_ENTRY(filed) next; /* next in linked list */ 310 }; 311 static STAILQ_HEAD(, filed) fhead = 312 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 313 static struct filed consfile; /* Console */ 314 315 316 /* 317 * Queue of about-to-be dead processes we should watch out for. 318 */ 319 struct deadq_entry { 320 int dq_procdesc; 321 int dq_timeout; 322 TAILQ_ENTRY(deadq_entry) dq_entries; 323 }; 324 static TAILQ_HEAD(, deadq_entry) deadq_head = 325 TAILQ_HEAD_INITIALIZER(deadq_head); 326 327 /* 328 * The timeout to apply to processes waiting on the dead queue. Unit 329 * of measure is `mark intervals', i.e. 20 minutes by default. 330 * Processes on the dead queue will be terminated after that time. 331 */ 332 333 #define DQ_TIMO_INIT 2 334 335 /* 336 * Network addresses that are allowed to log to us. 337 */ 338 struct allowedpeer { 339 bool isnumeric; 340 u_short port; 341 union { 342 struct { 343 struct sockaddr_storage addr; 344 struct sockaddr_storage mask; 345 } numeric; 346 char *name; 347 } u; 348 #define a_addr u.numeric.addr 349 #define a_mask u.numeric.mask 350 #define a_name u.name 351 STAILQ_ENTRY(allowedpeer) next; 352 }; 353 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 354 355 /* 356 * Intervals at which we flush out "message repeated" messages, 357 * in seconds after previous message is logged. After each flush, 358 * we move to the next interval until we reach the largest. 359 */ 360 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 361 #define MAXREPEAT (nitems(repeatinterval) - 1) 362 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 363 #define BACKOFF(f) do { \ 364 if (++(f)->f_repeatcount > MAXREPEAT) \ 365 (f)->f_repeatcount = MAXREPEAT; \ 366 } while (0) 367 368 static const char *TypeNames[] = { 369 "UNUSED", 370 "FILE", 371 "TTY", 372 "CONSOLE", 373 "FORW", 374 "USERS", 375 "WALL", 376 "PIPE", 377 }; 378 379 static const int sigcatch[] = { 380 SIGHUP, 381 SIGINT, 382 SIGQUIT, 383 SIGPIPE, 384 SIGALRM, 385 SIGTERM, 386 SIGCHLD, 387 }; 388 389 static int nulldesc; /* /dev/null descriptor */ 390 static bool Debug; /* debug flag */ 391 static bool Foreground = false; /* Run in foreground, instead of daemonizing */ 392 static bool resolve = true; /* resolve hostname */ 393 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 394 static const char *LocalDomain; /* our local domain name */ 395 static bool Initialized; /* set when we have initialized ourselves */ 396 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 397 static int MarkSeq; /* mark sequence number */ 398 static bool NoBind; /* don't bind() as suggested by RFC 3164 */ 399 static int SecureMode; /* when true, receive only unix domain socks */ 400 static int MaxForwardLen = 1024; /* max length of forwared message */ 401 #ifdef INET6 402 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 403 #else 404 static int family = PF_INET; /* protocol family (IPv4 only) */ 405 #endif 406 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 407 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 408 static int use_bootfile; /* log entire bootfile for every kern msg */ 409 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 410 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 411 412 static char bootfile[MAXPATHLEN]; /* booted kernel file */ 413 414 static bool RemoteAddDate; /* Always set the date on remote messages */ 415 static bool RemoteHostname; /* Log remote hostname from the message */ 416 417 static bool UniquePriority; /* Only log specified priority? */ 418 static int LogFacPri; /* Put facility and priority in log message: */ 419 /* 0=no, 1=numeric, 2=names */ 420 static bool KeepKernFac; /* Keep remotely logged kernel facility */ 421 static bool needdofsync = true; /* Are any file(s) waiting to be fsynced? */ 422 static struct pidfh *pfh; 423 static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ 424 425 struct iovlist; 426 427 static bool allowaddr(char *); 428 static void addpeer(const char *, const char *, mode_t); 429 static void addsock(const char *, const char *, mode_t); 430 static void cfline(const char *, const char *, const char *, const char *); 431 static const char *cvthname(struct sockaddr *); 432 static void deadq_enter(int); 433 static void deadq_remove(struct deadq_entry *); 434 static int decode(const char *, const CODE *); 435 static void die(int) __dead2; 436 static void dofsync(void); 437 static void fprintlog_first(struct filed *, const char *, const char *, 438 const char *, const char *, const char *, const char *, int); 439 static void fprintlog_write(struct filed *, struct iovlist *, int); 440 static void fprintlog_successive(struct filed *, int); 441 static void init(bool); 442 static void logerror(const char *); 443 static void logmsg(int, const struct logtime *, const char *, const char *, 444 const char *, const char *, const char *, const char *, int); 445 static void markit(void); 446 static struct socklist *socksetup(struct addrinfo *, const char *, mode_t); 447 static int socklist_recv_file(struct socklist *); 448 static int socklist_recv_sock(struct socklist *); 449 static int skip_message(const char *, const char *, int); 450 static int evaluate_prop_filter(const struct prop_filter *filter, 451 const char *value); 452 static struct prop_filter *prop_filter_compile(const char *); 453 static void parsemsg(const char *, char *); 454 static void printsys(char *); 455 static int p_open(const char *, pid_t *); 456 static const char *ttymsg_check(struct iovec *, int, char *, int); 457 static void usage(void); 458 static bool validate(struct sockaddr *, const char *); 459 static void unmapped(struct sockaddr *); 460 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 461 static int waitdaemon(int); 462 static void increase_rcvbuf(int); 463 464 static void 465 close_filed(struct filed *f) 466 { 467 468 if (f == NULL || f->f_file == -1) 469 return; 470 471 switch (f->f_type) { 472 case F_FORW: 473 if (f->fu_forw_addr != NULL) { 474 freeaddrinfo(f->fu_forw_addr); 475 f->fu_forw_addr = NULL; 476 } 477 /* FALLTHROUGH */ 478 case F_FILE: 479 case F_TTY: 480 case F_CONSOLE: 481 f->f_type = F_UNUSED; 482 break; 483 case F_PIPE: 484 if (f->fu_pipe_pd >= 0) { 485 deadq_enter(f->fu_pipe_pd); 486 f->fu_pipe_pd = -1; 487 } 488 break; 489 default: 490 break; 491 } 492 (void)close(f->f_file); 493 f->f_file = -1; 494 } 495 496 static void 497 addpeer(const char *name, const char *serv, mode_t mode) 498 { 499 struct peer *pe = calloc(1, sizeof(*pe)); 500 if (pe == NULL) 501 err(1, "malloc failed"); 502 pe->pe_name = name; 503 pe->pe_serv = serv; 504 pe->pe_mode = mode; 505 STAILQ_INSERT_TAIL(&pqueue, pe, next); 506 } 507 508 static void 509 addsock(const char *name, const char *serv, mode_t mode) 510 { 511 struct addrinfo hints = { }, *res, *res0; 512 struct socklist *sl; 513 int error; 514 char *cp, *msgbuf; 515 516 /* 517 * We have to handle this case for backwards compatibility: 518 * If there are two (or more) colons but no '[' and ']', 519 * assume this is an inet6 address without a service. 520 */ 521 if (name != NULL) { 522 #ifdef INET6 523 if (name[0] == '[' && 524 (cp = strchr(name + 1, ']')) != NULL) { 525 name = &name[1]; 526 *cp = '\0'; 527 if (cp[1] == ':' && cp[2] != '\0') 528 serv = cp + 2; 529 } else { 530 #endif 531 cp = strchr(name, ':'); 532 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 533 *cp = '\0'; 534 if (cp[1] != '\0') 535 serv = cp + 1; 536 if (cp == name) 537 name = NULL; 538 } 539 #ifdef INET6 540 } 541 #endif 542 } 543 hints.ai_family = AF_UNSPEC; 544 hints.ai_socktype = SOCK_DGRAM; 545 hints.ai_flags = AI_PASSIVE; 546 if (name != NULL) 547 dprintf("Trying peer: %s\n", name); 548 if (serv == NULL) 549 serv = "syslog"; 550 error = getaddrinfo(name, serv, &hints, &res0); 551 if (error == EAI_NONAME && name == NULL && SecureMode > 1) { 552 /* 553 * If we're in secure mode, we won't open inet sockets anyway. 554 * This failure can arise legitimately when running in a jail 555 * without networking. 556 */ 557 return; 558 } 559 if (error) { 560 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 561 name == NULL ? "" : name, serv, 562 gai_strerror(error)); 563 errno = 0; 564 if (msgbuf == NULL) 565 logerror(gai_strerror(error)); 566 else 567 logerror(msgbuf); 568 free(msgbuf); 569 die(0); 570 } 571 for (res = res0; res != NULL; res = res->ai_next) { 572 sl = socksetup(res, name, mode); 573 if (sl == NULL) 574 continue; 575 STAILQ_INSERT_TAIL(&shead, sl, next); 576 } 577 freeaddrinfo(res0); 578 } 579 580 static void 581 addfile(int fd) 582 { 583 struct socklist *sl = calloc(1, sizeof(*sl)); 584 if (sl == NULL) 585 err(1, "malloc failed"); 586 sl->sl_socket = fd; 587 sl->sl_recv = socklist_recv_file; 588 STAILQ_INSERT_TAIL(&shead, sl, next); 589 } 590 591 int 592 main(int argc, char *argv[]) 593 { 594 struct sigaction act = { }; 595 struct kevent ev; 596 struct socklist *sl; 597 pid_t spid; 598 int ch, kq, ppipe_w = -1, s; 599 char *p; 600 bool bflag = false, pflag = false, Sflag = false; 601 602 if (madvise(NULL, 0, MADV_PROTECT) != 0) 603 dprintf("madvise() failed: %s\n", strerror(errno)); 604 605 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) 606 != -1) 607 switch (ch) { 608 #ifdef INET 609 case '4': 610 family = PF_INET; 611 break; 612 #endif 613 #ifdef INET6 614 case '6': 615 family = PF_INET6; 616 break; 617 #endif 618 case '8': 619 mask_C1 = 0; 620 break; 621 case 'A': 622 send_to_all = true; 623 break; 624 case 'a': /* allow specific network addresses only */ 625 if (!allowaddr(optarg)) 626 usage(); 627 break; 628 case 'b': 629 bflag = true; 630 p = strchr(optarg, ']'); 631 if (p != NULL) 632 p = strchr(p + 1, ':'); 633 else { 634 p = strchr(optarg, ':'); 635 if (p != NULL && strchr(p + 1, ':') != NULL) 636 p = NULL; /* backward compatibility */ 637 } 638 if (p == NULL) { 639 /* A hostname or filename only. */ 640 addpeer(optarg, "syslog", 0); 641 } else { 642 /* The case of "name:service". */ 643 *p++ = '\0'; 644 addpeer(strlen(optarg) == 0 ? NULL : optarg, 645 p, 0); 646 } 647 break; 648 case 'c': 649 no_compress++; 650 break; 651 case 'C': 652 logflags |= O_CREAT; 653 break; 654 case 'd': /* debug */ 655 Debug = true; 656 break; 657 case 'f': /* configuration file */ 658 ConfFile = optarg; 659 break; 660 case 'F': /* run in foreground instead of daemon */ 661 Foreground = true; 662 break; 663 case 'H': 664 RemoteHostname = true; 665 break; 666 case 'k': /* keep remote kern fac */ 667 KeepKernFac = true; 668 break; 669 case 'l': 670 case 'p': 671 case 'S': 672 { 673 long perml; 674 mode_t mode; 675 char *name, *ep; 676 677 if (ch == 'l') 678 mode = DEFFILEMODE; 679 else if (ch == 'p') { 680 mode = DEFFILEMODE; 681 pflag = true; 682 } else { 683 mode = S_IRUSR | S_IWUSR; 684 Sflag = true; 685 } 686 if (optarg[0] == '/') 687 name = optarg; 688 else if ((name = strchr(optarg, ':')) != NULL) { 689 *name++ = '\0'; 690 if (name[0] != '/') 691 errx(1, "socket name must be absolute " 692 "path"); 693 if (isdigit(*optarg)) { 694 perml = strtol(optarg, &ep, 8); 695 if (*ep || perml < 0 || 696 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 697 errx(1, "invalid mode %s, exiting", 698 optarg); 699 mode = (mode_t )perml; 700 } else 701 errx(1, "invalid mode %s, exiting", 702 optarg); 703 } else 704 errx(1, "invalid filename %s, exiting", 705 optarg); 706 addpeer(name, NULL, mode); 707 break; 708 } 709 case 'M': /* max length of forwarded message */ 710 MaxForwardLen = atoi(optarg); 711 if (MaxForwardLen < 480) 712 errx(1, "minimum length limit of forwarded " 713 "messages is 480 bytes"); 714 break; 715 case 'm': /* mark interval */ 716 MarkInterval = atoi(optarg) * 60; 717 break; 718 case 'N': 719 NoBind = true; 720 if (!SecureMode) 721 SecureMode = 1; 722 break; 723 case 'n': 724 resolve = false; 725 break; 726 case 'O': 727 if (strcmp(optarg, "bsd") == 0 || 728 strcmp(optarg, "rfc3164") == 0) 729 RFC3164OutputFormat = true; 730 else if (strcmp(optarg, "syslog") == 0 || 731 strcmp(optarg, "rfc5424") == 0) 732 RFC3164OutputFormat = false; 733 else 734 usage(); 735 break; 736 case 'o': 737 use_bootfile = true; 738 break; 739 case 'P': /* path for alt. PID */ 740 PidFile = optarg; 741 break; 742 case 's': /* no network mode */ 743 SecureMode++; 744 break; 745 case 'T': 746 RemoteAddDate = true; 747 break; 748 case 'u': /* only log specified priority */ 749 UniquePriority = true; 750 break; 751 case 'v': /* log facility and priority */ 752 LogFacPri++; 753 break; 754 default: 755 usage(); 756 } 757 if ((argc -= optind) != 0) 758 usage(); 759 760 if (RFC3164OutputFormat && MaxForwardLen > 1024) 761 errx(1, "RFC 3164 messages may not exceed 1024 bytes"); 762 763 pfh = pidfile_open(PidFile, 0600, &spid); 764 if (pfh == NULL) { 765 if (errno == EEXIST) 766 errx(1, "syslogd already running, pid: %d", spid); 767 warn("cannot open pid file"); 768 } 769 770 /* 771 * Now that flags have been parsed, we know if we're in 772 * secure mode. Add peers to the socklist, if allowed. 773 */ 774 while (!STAILQ_EMPTY(&pqueue)) { 775 struct peer *pe = STAILQ_FIRST(&pqueue); 776 STAILQ_REMOVE_HEAD(&pqueue, next); 777 addsock(pe->pe_name, pe->pe_serv, pe->pe_mode); 778 free(pe); 779 } 780 /* Listen by default: /dev/klog. */ 781 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 782 if (s < 0) { 783 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 784 } else { 785 addfile(s); 786 } 787 /* Listen by default: *:514 if no -b flag. */ 788 if (bflag == 0) 789 addsock(NULL, "syslog", 0); 790 /* Listen by default: /var/run/log if no -p flag. */ 791 if (pflag == 0) 792 addsock(_PATH_LOG, NULL, DEFFILEMODE); 793 /* Listen by default: /var/run/logpriv if no -S flag. */ 794 if (Sflag == 0) 795 addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR); 796 797 consfile.f_type = F_CONSOLE; 798 consfile.f_file = -1; 799 (void)strlcpy(consfile.fu_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1, 800 sizeof(consfile.fu_fname)); 801 802 nulldesc = open(_PATH_DEVNULL, O_RDWR); 803 if (nulldesc == -1) { 804 warn("cannot open %s", _PATH_DEVNULL); 805 pidfile_remove(pfh); 806 exit(1); 807 } 808 809 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 810 811 if (!Foreground && !Debug) 812 ppipe_w = waitdaemon(30); 813 else if (Debug) 814 setlinebuf(stdout); 815 816 kq = kqueue(); 817 if (kq == -1) { 818 warn("failed to initialize kqueue"); 819 pidfile_remove(pfh); 820 exit(1); 821 } 822 STAILQ_FOREACH(sl, &shead, next) { 823 if (sl->sl_recv == NULL) 824 continue; 825 EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl); 826 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 827 warn("failed to add kevent to kqueue"); 828 pidfile_remove(pfh); 829 exit(1); 830 } 831 } 832 833 /* 834 * Syslogd will not reap its children via wait(). 835 * When SIGCHLD is ignored, zombie processes are 836 * not created. A child's PID will be recycled 837 * upon its exit. 838 */ 839 act.sa_handler = SIG_IGN; 840 for (size_t i = 0; i < nitems(sigcatch); ++i) { 841 EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 842 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 843 warn("failed to add kevent to kqueue"); 844 pidfile_remove(pfh); 845 exit(1); 846 } 847 if (sigaction(sigcatch[i], &act, NULL) == -1) { 848 warn("failed to apply signal handler"); 849 pidfile_remove(pfh); 850 exit(1); 851 } 852 } 853 (void)alarm(TIMERINTVL); 854 855 /* tuck my process id away */ 856 pidfile_write(pfh); 857 858 dprintf("off & running....\n"); 859 init(false); 860 for (;;) { 861 if (needdofsync) { 862 dofsync(); 863 if (ppipe_w != -1) { 864 /* 865 * Close our end of the pipe so our 866 * parent knows that we have finished 867 * initialization. 868 */ 869 (void)close(ppipe_w); 870 ppipe_w = -1; 871 } 872 } 873 if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) { 874 if (errno != EINTR) 875 logerror("kevent"); 876 continue; 877 } 878 switch (ev.filter) { 879 case EVFILT_READ: 880 sl = ev.udata; 881 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 882 sl->sl_recv(sl); 883 break; 884 case EVFILT_SIGNAL: 885 switch (ev.ident) { 886 case SIGHUP: 887 init(true); 888 break; 889 case SIGINT: 890 case SIGQUIT: 891 case SIGTERM: 892 if (ev.ident == SIGTERM || Debug) 893 die(ev.ident); 894 break; 895 case SIGALRM: 896 markit(); 897 break; 898 } 899 break; 900 } 901 } 902 } 903 904 static int 905 socklist_recv_sock(struct socklist *sl) 906 { 907 struct sockaddr_storage ss; 908 struct sockaddr *sa = (struct sockaddr *)&ss; 909 socklen_t sslen; 910 const char *hname; 911 char line[MAXLINE + 1]; 912 int len; 913 914 sslen = sizeof(ss); 915 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 916 dprintf("received sa_len = %d\n", sslen); 917 if (len == 0) 918 return (-1); 919 if (len < 0) { 920 if (errno != EINTR) 921 logerror("recvfrom"); 922 return (-1); 923 } 924 /* Received valid data. */ 925 line[len] = '\0'; 926 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 927 hname = LocalHostName; 928 else { 929 hname = cvthname(sa); 930 unmapped(sa); 931 if (validate(sa, hname) == 0) { 932 dprintf("Message from %s was ignored.", hname); 933 return (-1); 934 } 935 } 936 parsemsg(hname, line); 937 938 return (0); 939 } 940 941 static void 942 unmapped(struct sockaddr *sa) 943 { 944 #if defined(INET) && defined(INET6) 945 struct sockaddr_in6 *sin6; 946 struct sockaddr_in sin; 947 948 if (sa == NULL || 949 sa->sa_family != AF_INET6 || 950 sa->sa_len != sizeof(*sin6)) 951 return; 952 sin6 = satosin6(sa); 953 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 954 return; 955 sin = (struct sockaddr_in){ 956 .sin_family = AF_INET, 957 .sin_len = sizeof(sin), 958 .sin_port = sin6->sin6_port 959 }; 960 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 961 sizeof(sin.sin_addr)); 962 memcpy(sa, &sin, sizeof(sin)); 963 #else 964 if (sa == NULL) 965 return; 966 #endif 967 } 968 969 static void 970 usage(void) 971 { 972 973 fprintf(stderr, 974 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 975 " [-b bind_address] [-f config_file]\n" 976 " [-l [mode:]path] [-M fwd_length]\n" 977 " [-m mark_interval] [-O format] [-P pid_file]\n" 978 " [-p log_socket] [-S logpriv_socket]\n"); 979 exit(1); 980 } 981 982 /* 983 * Removes characters from log messages that are unsafe to display. 984 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 985 */ 986 static void 987 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 988 { 989 char *q; 990 int c; 991 992 q = out; 993 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 994 if (mask_C1 && (c & 0x80) && c < 0xA0) { 995 c &= 0x7F; 996 *q++ = 'M'; 997 *q++ = '-'; 998 } 999 if (isascii(c) && iscntrl(c)) { 1000 if (c == '\n') { 1001 *q++ = ' '; 1002 } else if (c == '\t') { 1003 *q++ = '\t'; 1004 } else { 1005 *q++ = '^'; 1006 *q++ = c ^ 0100; 1007 } 1008 } else { 1009 *q++ = c; 1010 } 1011 } 1012 *q = '\0'; 1013 } 1014 1015 /* 1016 * Parses a syslog message according to RFC 5424, assuming that PRI and 1017 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 1018 * parsed result is passed to logmsg(). 1019 */ 1020 static void 1021 parsemsg_rfc5424(const char *from, int pri, char *msg) 1022 { 1023 const struct logtime *timestamp; 1024 struct logtime timestamp_remote; 1025 const char *omsg, *hostname, *app_name, *procid, *msgid, 1026 *structured_data; 1027 char line[MAXLINE + 1]; 1028 1029 #define FAIL_IF(field, expr) do { \ 1030 if (expr) { \ 1031 dprintf("Failed to parse " field " from %s: %s\n", \ 1032 from, omsg); \ 1033 return; \ 1034 } \ 1035 } while (0) 1036 #define PARSE_CHAR(field, sep) do { \ 1037 FAIL_IF(field, *msg != sep); \ 1038 ++msg; \ 1039 } while (0) 1040 #define IF_NOT_NILVALUE(var) \ 1041 if (msg[0] == '-' && msg[1] == ' ') { \ 1042 msg += 2; \ 1043 var = NULL; \ 1044 } else if (msg[0] == '-' && msg[1] == '\0') { \ 1045 ++msg; \ 1046 var = NULL; \ 1047 } else 1048 1049 omsg = msg; 1050 IF_NOT_NILVALUE(timestamp) { 1051 /* Parse RFC 3339-like timestamp. */ 1052 #define PARSE_NUMBER(dest, length, min, max) do { \ 1053 int i, v; \ 1054 \ 1055 v = 0; \ 1056 for (i = 0; i < length; ++i) { \ 1057 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 1058 v = v * 10 + *msg++ - '0'; \ 1059 } \ 1060 FAIL_IF("TIMESTAMP", v < min || v > max); \ 1061 dest = v; \ 1062 } while (0) 1063 /* Date and time. */ 1064 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 1065 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 1066 timestamp_remote.tm.tm_year -= 1900; 1067 PARSE_CHAR("TIMESTAMP", '-'); 1068 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 1069 --timestamp_remote.tm.tm_mon; 1070 PARSE_CHAR("TIMESTAMP", '-'); 1071 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 1072 PARSE_CHAR("TIMESTAMP", 'T'); 1073 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 1074 PARSE_CHAR("TIMESTAMP", ':'); 1075 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1076 PARSE_CHAR("TIMESTAMP", ':'); 1077 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1078 /* Perform normalization. */ 1079 timegm(×tamp_remote.tm); 1080 /* Optional: fractional seconds. */ 1081 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1082 int i; 1083 1084 ++msg; 1085 for (i = 100000; i != 0; i /= 10) { 1086 if (*msg < '0' || *msg > '9') 1087 break; 1088 timestamp_remote.usec += (*msg++ - '0') * i; 1089 } 1090 } 1091 /* Timezone. */ 1092 if (*msg == 'Z') { 1093 /* UTC. */ 1094 ++msg; 1095 } else { 1096 int sign, tz_hour, tz_min; 1097 1098 /* Local time zone offset. */ 1099 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1100 sign = *msg++ == '-' ? -1 : 1; 1101 PARSE_NUMBER(tz_hour, 2, 0, 23); 1102 PARSE_CHAR("TIMESTAMP", ':'); 1103 PARSE_NUMBER(tz_min, 2, 0, 59); 1104 timestamp_remote.tm.tm_gmtoff = 1105 sign * (tz_hour * 3600 + tz_min * 60); 1106 } 1107 #undef PARSE_NUMBER 1108 PARSE_CHAR("TIMESTAMP", ' '); 1109 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1110 } 1111 1112 /* String fields part of the HEADER. */ 1113 #define PARSE_STRING(field, var) \ 1114 IF_NOT_NILVALUE(var) { \ 1115 var = msg; \ 1116 while (*msg >= '!' && *msg <= '~') \ 1117 ++msg; \ 1118 FAIL_IF(field, var == msg); \ 1119 PARSE_CHAR(field, ' '); \ 1120 msg[-1] = '\0'; \ 1121 } 1122 PARSE_STRING("HOSTNAME", hostname); 1123 if (hostname == NULL || !RemoteHostname) 1124 hostname = from; 1125 PARSE_STRING("APP-NAME", app_name); 1126 PARSE_STRING("PROCID", procid); 1127 PARSE_STRING("MSGID", msgid); 1128 #undef PARSE_STRING 1129 1130 /* Structured data. */ 1131 #define PARSE_SD_NAME() do { \ 1132 const char *start; \ 1133 \ 1134 start = msg; \ 1135 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1136 *msg != ']' && *msg != '"') \ 1137 ++msg; \ 1138 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1139 } while (0) 1140 IF_NOT_NILVALUE(structured_data) { 1141 structured_data = msg; 1142 /* SD-ELEMENT. */ 1143 while (*msg == '[') { 1144 ++msg; 1145 /* SD-ID. */ 1146 PARSE_SD_NAME(); 1147 /* SD-PARAM. */ 1148 while (*msg == ' ') { 1149 ++msg; 1150 /* PARAM-NAME. */ 1151 PARSE_SD_NAME(); 1152 PARSE_CHAR("STRUCTURED-NAME", '='); 1153 PARSE_CHAR("STRUCTURED-NAME", '"'); 1154 while (*msg != '"') { 1155 FAIL_IF("STRUCTURED-NAME", 1156 *msg == '\0'); 1157 if (*msg++ == '\\') { 1158 FAIL_IF("STRUCTURED-NAME", 1159 *msg == '\0'); 1160 ++msg; 1161 } 1162 } 1163 ++msg; 1164 } 1165 PARSE_CHAR("STRUCTURED-NAME", ']'); 1166 } 1167 PARSE_CHAR("STRUCTURED-NAME", ' '); 1168 msg[-1] = '\0'; 1169 } 1170 #undef PARSE_SD_NAME 1171 1172 #undef FAIL_IF 1173 #undef PARSE_CHAR 1174 #undef IF_NOT_NILVALUE 1175 1176 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1177 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1178 structured_data, line, 0); 1179 } 1180 1181 /* 1182 * Returns the length of the application name ("TAG" in RFC 3164 1183 * terminology) and process ID from a message if present. 1184 */ 1185 static void 1186 parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, 1187 ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) 1188 { 1189 const char *m, *procid_begin; 1190 size_t app_name_length, procid_length; 1191 1192 m = msg; 1193 1194 /* Application name. */ 1195 app_name_length = strspn(m, 1196 "abcdefghijklmnopqrstuvwxyz" 1197 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1198 "0123456789" 1199 "_-/"); 1200 if (app_name_length == 0) 1201 goto bad; 1202 m += app_name_length; 1203 1204 /* Process identifier (optional). */ 1205 if (*m == '[') { 1206 procid_begin = ++m; 1207 procid_length = strspn(m, "0123456789"); 1208 if (procid_length == 0) 1209 goto bad; 1210 m += procid_length; 1211 if (*m++ != ']') 1212 goto bad; 1213 } else { 1214 procid_begin = NULL; 1215 procid_length = 0; 1216 } 1217 1218 /* Separator. */ 1219 if (m[0] != ':' || m[1] != ' ') 1220 goto bad; 1221 1222 *app_name_length_p = app_name_length; 1223 if (procid_begin_offset_p != NULL) 1224 *procid_begin_offset_p = 1225 procid_begin == NULL ? 0 : procid_begin - msg; 1226 if (procid_length_p != NULL) 1227 *procid_length_p = procid_length; 1228 return; 1229 bad: 1230 *app_name_length_p = 0; 1231 if (procid_begin_offset_p != NULL) 1232 *procid_begin_offset_p = 0; 1233 if (procid_length_p != NULL) 1234 *procid_length_p = 0; 1235 } 1236 1237 /* 1238 * Trims the application name ("TAG" in RFC 3164 terminology) and 1239 * process ID from a message if present. 1240 */ 1241 static void 1242 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1243 const char **procid) 1244 { 1245 char *m, *app_name_begin, *procid_begin; 1246 size_t app_name_length, procid_length; 1247 ptrdiff_t procid_begin_offset; 1248 1249 m = *msg; 1250 app_name_begin = m; 1251 1252 parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, 1253 &procid_begin_offset, &procid_length); 1254 if (app_name_length == 0) 1255 goto bad; 1256 procid_begin = procid_begin_offset == 0 ? NULL : 1257 app_name_begin + procid_begin_offset; 1258 1259 /* Split strings from input. */ 1260 app_name_begin[app_name_length] = '\0'; 1261 m += app_name_length + 1; 1262 if (procid_begin != NULL) { 1263 procid_begin[procid_length] = '\0'; 1264 m += procid_length + 2; 1265 } 1266 1267 *msg = m + 1; 1268 *app_name = app_name_begin; 1269 *procid = procid_begin; 1270 return; 1271 bad: 1272 *app_name = NULL; 1273 *procid = NULL; 1274 } 1275 1276 /* 1277 * Parses a syslog message according to RFC 3164, assuming that PRI 1278 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1279 * result is passed to logmsg(). 1280 */ 1281 static void 1282 parsemsg_rfc3164(const char *from, int pri, char *msg) 1283 { 1284 struct tm tm_parsed; 1285 const struct logtime *timestamp; 1286 struct logtime timestamp_remote; 1287 const char *app_name, *procid; 1288 size_t i, msglen; 1289 char line[MAXLINE + 1]; 1290 1291 /* 1292 * Parse the TIMESTAMP provided by the remote side. If none is 1293 * found, assume this is not an RFC 3164 formatted message, 1294 * only containing a TAG and a MSG. 1295 */ 1296 timestamp = NULL; 1297 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1298 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1299 msg += RFC3164_DATELEN + 1; 1300 if (!RemoteAddDate) { 1301 struct tm tm_now; 1302 time_t t_now; 1303 int year; 1304 1305 /* 1306 * As the timestamp does not contain the year 1307 * number, daylight saving time information, nor 1308 * a time zone, attempt to infer it. Due to 1309 * clock skews, the timestamp may even be part 1310 * of the next year. Use the last year for which 1311 * the timestamp is at most one week in the 1312 * future. 1313 * 1314 * This loop can only run for at most three 1315 * iterations before terminating. 1316 */ 1317 t_now = time(NULL); 1318 localtime_r(&t_now, &tm_now); 1319 for (year = tm_now.tm_year + 1;; --year) { 1320 assert(year >= tm_now.tm_year - 1); 1321 timestamp_remote.tm = tm_parsed; 1322 timestamp_remote.tm.tm_year = year; 1323 timestamp_remote.tm.tm_isdst = -1; 1324 timestamp_remote.usec = 0; 1325 if (mktime(×tamp_remote.tm) < 1326 t_now + 7 * 24 * 60 * 60) 1327 break; 1328 } 1329 timestamp = ×tamp_remote; 1330 } 1331 1332 /* 1333 * A single space character MUST also follow the HOSTNAME field. 1334 */ 1335 msglen = strlen(msg); 1336 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1337 if (msg[i] == ' ') { 1338 if (RemoteHostname) { 1339 msg[i] = '\0'; 1340 from = msg; 1341 } 1342 msg += i + 1; 1343 break; 1344 } 1345 /* 1346 * Support non RFC compliant messages, without hostname. 1347 */ 1348 if (msg[i] == ':') 1349 break; 1350 } 1351 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1352 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1353 return; 1354 } 1355 } 1356 1357 /* Remove the TAG, if present. */ 1358 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1359 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1360 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1361 } 1362 1363 /* 1364 * Takes a raw input line, extracts PRI and determines whether the 1365 * message is formatted according to RFC 3164 or RFC 5424. Continues 1366 * parsing of addition fields in the message according to those 1367 * standards and prints the message on the appropriate log files. 1368 */ 1369 static void 1370 parsemsg(const char *from, char *msg) 1371 { 1372 char *q; 1373 long n; 1374 size_t i; 1375 int pri; 1376 1377 i = -1; 1378 pri = DEFUPRI; 1379 1380 /* Parse PRI. */ 1381 if (msg[0] == '<' && isdigit(msg[1])) { 1382 for (i = 2; i <= 4; i++) { 1383 if (msg[i] == '>') { 1384 errno = 0; 1385 n = strtol(msg + 1, &q, 10); 1386 if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) { 1387 pri = n; 1388 msg += i + 1; 1389 i = 0; 1390 } 1391 break; 1392 } 1393 } 1394 } 1395 1396 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1397 pri = DEFUPRI; 1398 1399 /* 1400 * Don't allow users to log kernel messages. 1401 * NOTE: since LOG_KERN == 0 this will also match 1402 * messages with no facility specified. 1403 */ 1404 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1405 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1406 1407 /* Parse VERSION. */ 1408 if (i == 0 && msg[0] == '1' && msg[1] == ' ') 1409 parsemsg_rfc5424(from, pri, msg + 2); 1410 else 1411 parsemsg_rfc3164(from, pri, msg); 1412 } 1413 1414 /* 1415 * Read /dev/klog while data are available, split into lines. 1416 */ 1417 static int 1418 socklist_recv_file(struct socklist *sl) 1419 { 1420 char *p, *q, line[MAXLINE + 1]; 1421 int len, i; 1422 1423 len = 0; 1424 for (;;) { 1425 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1426 if (i > 0) { 1427 line[i + len] = '\0'; 1428 } else { 1429 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1430 logerror("klog"); 1431 close(sl->sl_socket); 1432 sl->sl_socket = -1; 1433 } 1434 break; 1435 } 1436 1437 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1438 *q = '\0'; 1439 printsys(p); 1440 } 1441 len = strlen(p); 1442 if (len >= MAXLINE - 1) { 1443 printsys(p); 1444 len = 0; 1445 } 1446 if (len > 0) 1447 memmove(line, p, len + 1); 1448 } 1449 if (len > 0) 1450 printsys(line); 1451 1452 return (len); 1453 } 1454 1455 /* 1456 * Take a raw input line from /dev/klog, format similar to syslog(). 1457 */ 1458 static void 1459 printsys(char *msg) 1460 { 1461 char *p, *q; 1462 long n; 1463 int flags, isprintf, pri; 1464 1465 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1466 p = msg; 1467 pri = DEFSPRI; 1468 isprintf = 1; 1469 if (*p == '<') { 1470 errno = 0; 1471 n = strtol(p + 1, &q, 10); 1472 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1473 p = q + 1; 1474 pri = n; 1475 isprintf = 0; 1476 } 1477 } 1478 /* 1479 * Kernel printf's and LOG_CONSOLE messages have been displayed 1480 * on the console already. 1481 */ 1482 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1483 flags |= IGN_CONS; 1484 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1485 pri = DEFSPRI; 1486 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1487 } 1488 1489 static time_t now; 1490 1491 /* 1492 * Match a program or host name against a specification. 1493 * Return a non-0 value if the message must be ignored 1494 * based on the specification. 1495 */ 1496 static int 1497 skip_message(const char *name, const char *spec, int checkcase) 1498 { 1499 const char *s; 1500 char prev, next; 1501 int exclude = 0; 1502 /* Behaviour on explicit match */ 1503 1504 if (spec == NULL) 1505 return (0); 1506 switch (*spec) { 1507 case '-': 1508 exclude = 1; 1509 /*FALLTHROUGH*/ 1510 case '+': 1511 spec++; 1512 break; 1513 default: 1514 break; 1515 } 1516 if (checkcase) 1517 s = strstr (spec, name); 1518 else 1519 s = strcasestr (spec, name); 1520 1521 if (s != NULL) { 1522 prev = (s == spec ? ',' : *(s - 1)); 1523 next = *(s + strlen (name)); 1524 1525 if (prev == ',' && (next == '\0' || next == ',')) 1526 /* Explicit match: skip iff the spec is an 1527 exclusive one. */ 1528 return (exclude); 1529 } 1530 1531 /* No explicit match for this name: skip the message iff 1532 the spec is an inclusive one. */ 1533 return (!exclude); 1534 } 1535 1536 /* 1537 * Match some property of the message against a filter. 1538 * Return a non-0 value if the message must be ignored 1539 * based on the filter. 1540 */ 1541 static int 1542 evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1543 { 1544 const char *s = NULL; 1545 const int exclude = ((filter->cmp_flags & FILT_FLAG_EXCLUDE) > 0); 1546 size_t valuelen; 1547 1548 if (value == NULL) 1549 return (-1); 1550 1551 if (filter->cmp_type == FILT_CMP_REGEX) { 1552 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1553 return (exclude); 1554 else 1555 return (!exclude); 1556 } 1557 1558 valuelen = strlen(value); 1559 1560 /* a shortcut for equal with different length is always false */ 1561 if (filter->cmp_type == FILT_CMP_EQUAL && 1562 valuelen != filter->pflt_strlen) 1563 return (!exclude); 1564 1565 if (filter->cmp_flags & FILT_FLAG_ICASE) 1566 s = strcasestr(value, filter->pflt_strval); 1567 else 1568 s = strstr(value, filter->pflt_strval); 1569 1570 /* 1571 * FILT_CMP_CONTAINS true if s 1572 * FILT_CMP_STARTS true if s && s == value 1573 * FILT_CMP_EQUAL true if s && s == value && 1574 * valuelen == filter->pflt_strlen 1575 * (and length match is checked 1576 * already) 1577 */ 1578 1579 switch (filter->cmp_type) { 1580 case FILT_CMP_STARTS: 1581 case FILT_CMP_EQUAL: 1582 if (s != value) 1583 return (!exclude); 1584 /* FALLTHROUGH */ 1585 case FILT_CMP_CONTAINS: 1586 if (s) 1587 return (exclude); 1588 else 1589 return (!exclude); 1590 break; 1591 default: 1592 /* unknown cmp_type */ 1593 break; 1594 } 1595 1596 return (-1); 1597 } 1598 1599 /* 1600 * Logs a message to the appropriate log files, users, etc. based on the 1601 * priority. Log messages are formatted according to RFC 3164 or 1602 * RFC 5424 in subsequent fprintlog_*() functions. 1603 */ 1604 static void 1605 logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1606 const char *app_name, const char *procid, const char *msgid, 1607 const char *structured_data, const char *msg, int flags) 1608 { 1609 struct timeval tv; 1610 struct logtime timestamp_now; 1611 struct filed *f; 1612 size_t savedlen; 1613 int fac, prilev; 1614 char saved[MAXSVLINE], kernel_app_name[100]; 1615 1616 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1617 pri, flags, hostname, msg); 1618 1619 (void)gettimeofday(&tv, NULL); 1620 now = tv.tv_sec; 1621 if (timestamp == NULL) { 1622 localtime_r(&now, ×tamp_now.tm); 1623 timestamp_now.usec = tv.tv_usec; 1624 timestamp = ×tamp_now; 1625 } 1626 1627 /* extract facility and priority level */ 1628 if (flags & MARK) 1629 fac = LOG_NFACILITIES; 1630 else 1631 fac = LOG_FAC(pri); 1632 1633 /* Check maximum facility number. */ 1634 if (fac > LOG_NFACILITIES) 1635 return; 1636 1637 prilev = LOG_PRI(pri); 1638 1639 /* 1640 * Lookup kernel app name from log prefix if present. 1641 * This is only used for local program specification matching. 1642 */ 1643 if (flags & ISKERNEL) { 1644 size_t kernel_app_name_length; 1645 1646 parsemsg_rfc3164_get_app_name_procid(msg, 1647 &kernel_app_name_length, NULL, NULL); 1648 if (kernel_app_name_length != 0) { 1649 strlcpy(kernel_app_name, msg, 1650 MIN(sizeof(kernel_app_name), 1651 kernel_app_name_length + 1)); 1652 } else 1653 kernel_app_name[0] = '\0'; 1654 } 1655 1656 /* log the message to the particular outputs */ 1657 if (!Initialized) { 1658 consfile.f_lasttime = *timestamp; 1659 fprintlog_first(&consfile, hostname, app_name, procid, 1660 msgid, structured_data, msg, flags); 1661 return; 1662 } 1663 1664 /* 1665 * Store all of the fields of the message, except the timestamp, 1666 * in a single string. This string is used to detect duplicate 1667 * messages. 1668 */ 1669 assert(hostname != NULL); 1670 assert(msg != NULL); 1671 savedlen = snprintf(saved, sizeof(saved), 1672 "%d %s %s %s %s %s %s", pri, hostname, 1673 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1674 msgid == NULL ? "-" : msgid, 1675 structured_data == NULL ? "-" : structured_data, msg); 1676 1677 STAILQ_FOREACH(f, &fhead, next) { 1678 /* skip messages that are incorrect priority */ 1679 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1680 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1681 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1682 ) 1683 || f->f_pmask[fac] == INTERNAL_NOPRI) 1684 continue; 1685 1686 /* skip messages with the incorrect hostname */ 1687 if (skip_message(hostname, f->f_host, 0)) 1688 continue; 1689 1690 /* skip messages with the incorrect program name */ 1691 if (flags & ISKERNEL && kernel_app_name[0] != '\0') { 1692 if (skip_message(kernel_app_name, f->f_program, 1)) 1693 continue; 1694 } else if (skip_message(app_name == NULL ? "" : app_name, 1695 f->f_program, 1)) 1696 continue; 1697 1698 /* skip messages if a property does not match filter */ 1699 if (f->f_prop_filter != NULL && 1700 f->f_prop_filter->prop_type != FILT_PROP_NOOP) { 1701 switch (f->f_prop_filter->prop_type) { 1702 case FILT_PROP_MSG: 1703 if (evaluate_prop_filter(f->f_prop_filter, 1704 msg)) 1705 continue; 1706 break; 1707 case FILT_PROP_HOSTNAME: 1708 if (evaluate_prop_filter(f->f_prop_filter, 1709 hostname)) 1710 continue; 1711 break; 1712 case FILT_PROP_PROGNAME: 1713 if (evaluate_prop_filter(f->f_prop_filter, 1714 app_name == NULL ? "" : app_name)) 1715 continue; 1716 break; 1717 default: 1718 continue; 1719 } 1720 } 1721 1722 /* skip message to console if it has already been printed */ 1723 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1724 continue; 1725 1726 /* don't output marks to recently written files */ 1727 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1728 continue; 1729 1730 /* 1731 * suppress duplicate lines to this file 1732 */ 1733 if (no_compress - (f->f_type != F_PIPE) < 1 && 1734 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1735 strcmp(saved, f->f_prevline) == 0) { 1736 f->f_lasttime = *timestamp; 1737 f->f_prevcount++; 1738 dprintf("msg repeated %d times, %ld sec of %d\n", 1739 f->f_prevcount, (long)(now - f->f_time), 1740 repeatinterval[f->f_repeatcount]); 1741 /* 1742 * If domark would have logged this by now, 1743 * flush it now (so we don't hold isolated messages), 1744 * but back off so we'll flush less often 1745 * in the future. 1746 */ 1747 if (now > REPEATTIME(f)) { 1748 fprintlog_successive(f, flags); 1749 BACKOFF(f); 1750 } 1751 } else { 1752 /* new line, save it */ 1753 if (f->f_prevcount) 1754 fprintlog_successive(f, 0); 1755 f->f_repeatcount = 0; 1756 f->f_prevpri = pri; 1757 f->f_lasttime = *timestamp; 1758 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1759 "Space to store saved line incorrect"); 1760 (void)strcpy(f->f_prevline, saved); 1761 f->f_prevlen = savedlen; 1762 fprintlog_first(f, hostname, app_name, procid, msgid, 1763 structured_data, msg, flags); 1764 } 1765 } 1766 } 1767 1768 static void 1769 dofsync(void) 1770 { 1771 struct filed *f; 1772 1773 STAILQ_FOREACH(f, &fhead, next) { 1774 if (f->f_type == F_FILE && 1775 (f->f_flags & FFLAG_NEEDSYNC) != 0) { 1776 f->f_flags &= ~FFLAG_NEEDSYNC; 1777 (void)fsync(f->f_file); 1778 } 1779 } 1780 needdofsync = false; 1781 } 1782 1783 /* 1784 * List of iovecs to which entries can be appended. 1785 * Used for constructing the message to be logged. 1786 */ 1787 struct iovlist { 1788 struct iovec iov[TTYMSG_IOV_MAX]; 1789 size_t iovcnt; 1790 size_t totalsize; 1791 }; 1792 1793 static void 1794 iovlist_init(struct iovlist *il) 1795 { 1796 1797 il->iovcnt = 0; 1798 il->totalsize = 0; 1799 } 1800 1801 static void 1802 iovlist_append(struct iovlist *il, const char *str) 1803 { 1804 size_t size; 1805 1806 /* Discard components if we've run out of iovecs. */ 1807 if (il->iovcnt < nitems(il->iov)) { 1808 size = strlen(str); 1809 il->iov[il->iovcnt++] = (struct iovec){ 1810 .iov_base = __DECONST(char *, str), 1811 .iov_len = size, 1812 }; 1813 il->totalsize += size; 1814 } 1815 } 1816 1817 #if defined(INET) || defined(INET6) 1818 static void 1819 iovlist_truncate(struct iovlist *il, size_t size) 1820 { 1821 struct iovec *last; 1822 size_t diff; 1823 1824 while (il->totalsize > size) { 1825 diff = il->totalsize - size; 1826 last = &il->iov[il->iovcnt - 1]; 1827 if (diff >= last->iov_len) { 1828 /* Remove the last iovec entirely. */ 1829 --il->iovcnt; 1830 il->totalsize -= last->iov_len; 1831 } else { 1832 /* Remove the last iovec partially. */ 1833 last->iov_len -= diff; 1834 il->totalsize -= diff; 1835 } 1836 } 1837 } 1838 #endif 1839 1840 static void 1841 fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1842 { 1843 struct msghdr msghdr; 1844 struct addrinfo *r; 1845 struct socklist *sl; 1846 const char *msgret; 1847 ssize_t lsent; 1848 1849 switch (f->f_type) { 1850 case F_FORW: 1851 dprintf(" %s", f->fu_forw_hname); 1852 switch (f->fu_forw_addr->ai_family) { 1853 #ifdef INET 1854 case AF_INET: 1855 dprintf(":%d\n", 1856 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1857 break; 1858 #endif 1859 #ifdef INET6 1860 case AF_INET6: 1861 dprintf(":%d\n", 1862 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1863 break; 1864 #endif 1865 default: 1866 dprintf("\n"); 1867 } 1868 1869 #if defined(INET) || defined(INET6) 1870 /* Truncate messages to maximum forward length. */ 1871 iovlist_truncate(il, MaxForwardLen); 1872 #endif 1873 1874 lsent = 0; 1875 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1876 memset(&msghdr, 0, sizeof(msghdr)); 1877 msghdr.msg_name = r->ai_addr; 1878 msghdr.msg_namelen = r->ai_addrlen; 1879 msghdr.msg_iov = il->iov; 1880 msghdr.msg_iovlen = il->iovcnt; 1881 STAILQ_FOREACH(sl, &shead, next) { 1882 if (sl->sl_socket < 0) 1883 continue; 1884 if (sl->sl_sa == NULL || 1885 sl->sl_family == AF_UNSPEC || 1886 sl->sl_family == AF_LOCAL) 1887 continue; 1888 lsent = sendmsg(sl->sl_socket, &msghdr, 0); 1889 if (lsent == (ssize_t)il->totalsize) 1890 break; 1891 } 1892 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1893 break; 1894 } 1895 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1896 if (lsent != (ssize_t)il->totalsize) { 1897 int e = errno; 1898 logerror("sendto"); 1899 errno = e; 1900 switch (errno) { 1901 case ENOBUFS: 1902 case ENETDOWN: 1903 case ENETUNREACH: 1904 case EHOSTUNREACH: 1905 case EHOSTDOWN: 1906 case EADDRNOTAVAIL: 1907 break; 1908 /* case EBADF: */ 1909 /* case EACCES: */ 1910 /* case ENOTSOCK: */ 1911 /* case EFAULT: */ 1912 /* case EMSGSIZE: */ 1913 /* case EAGAIN: */ 1914 /* case ENOBUFS: */ 1915 /* case ECONNREFUSED: */ 1916 default: 1917 dprintf("removing entry: errno=%d\n", e); 1918 f->f_type = F_UNUSED; 1919 break; 1920 } 1921 } 1922 break; 1923 1924 case F_FILE: 1925 dprintf(" %s\n", f->fu_fname); 1926 iovlist_append(il, "\n"); 1927 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1928 /* 1929 * If writev(2) fails for potentially transient errors 1930 * like the filesystem being full, ignore it. 1931 * Otherwise remove this logfile from the list. 1932 */ 1933 if (errno != ENOSPC) { 1934 int e = errno; 1935 close_filed(f); 1936 errno = e; 1937 logerror(f->fu_fname); 1938 } 1939 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1940 f->f_flags |= FFLAG_NEEDSYNC; 1941 needdofsync = true; 1942 } 1943 break; 1944 1945 case F_PIPE: 1946 dprintf(" %s\n", f->fu_pipe_pname); 1947 iovlist_append(il, "\n"); 1948 if (f->fu_pipe_pd == -1) { 1949 if ((f->f_file = p_open(f->fu_pipe_pname, 1950 &f->fu_pipe_pd)) < 0) { 1951 logerror(f->fu_pipe_pname); 1952 break; 1953 } 1954 } 1955 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1956 logerror(f->fu_pipe_pname); 1957 close_filed(f); 1958 } 1959 break; 1960 1961 case F_CONSOLE: 1962 if (flags & IGN_CONS) { 1963 dprintf(" (ignored)\n"); 1964 break; 1965 } 1966 /* FALLTHROUGH */ 1967 1968 case F_TTY: 1969 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1970 iovlist_append(il, "\r\n"); 1971 errno = 0; /* ttymsg() only sometimes returns an errno */ 1972 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { 1973 f->f_type = F_UNUSED; 1974 logerror(msgret); 1975 } 1976 break; 1977 1978 case F_USERS: 1979 case F_WALL: 1980 dprintf("\n"); 1981 iovlist_append(il, "\r\n"); 1982 wallmsg(f, il->iov, il->iovcnt); 1983 break; 1984 default: 1985 break; 1986 } 1987 } 1988 1989 static void 1990 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1991 const char *procid, const char *msgid, const char *structured_data, 1992 const char *msg, int flags) 1993 { 1994 struct iovlist il; 1995 suseconds_t usec; 1996 int i; 1997 char timebuf[33], priority_number[5]; 1998 1999 iovlist_init(&il); 2000 if (f->f_type == F_WALL) 2001 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 2002 iovlist_append(&il, "<"); 2003 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 2004 iovlist_append(&il, priority_number); 2005 iovlist_append(&il, ">1 "); 2006 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 2007 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 2008 /* Add colon to the time zone offset, which %z doesn't do. */ 2009 timebuf[32] = '\0'; 2010 timebuf[31] = timebuf[30]; 2011 timebuf[30] = timebuf[29]; 2012 timebuf[29] = ':'; 2013 2014 /* Overwrite space for microseconds with actual value. */ 2015 usec = f->f_lasttime.usec; 2016 for (i = 25; i >= 20; --i) { 2017 timebuf[i] = usec % 10 + '0'; 2018 usec /= 10; 2019 } 2020 iovlist_append(&il, timebuf); 2021 } else 2022 iovlist_append(&il, "-"); 2023 iovlist_append(&il, " "); 2024 iovlist_append(&il, hostname); 2025 iovlist_append(&il, " "); 2026 iovlist_append(&il, app_name == NULL ? "-" : app_name); 2027 iovlist_append(&il, " "); 2028 iovlist_append(&il, procid == NULL ? "-" : procid); 2029 iovlist_append(&il, " "); 2030 iovlist_append(&il, msgid == NULL ? "-" : msgid); 2031 iovlist_append(&il, " "); 2032 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 2033 iovlist_append(&il, " "); 2034 iovlist_append(&il, msg); 2035 2036 fprintlog_write(f, &il, flags); 2037 } 2038 2039 static void 2040 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 2041 const char *procid, const char *msg, int flags) 2042 { 2043 struct iovlist il; 2044 const CODE *c; 2045 int facility, priority; 2046 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 2047 priority_number[5]; 2048 bool facility_found, priority_found; 2049 2050 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 2051 &f->f_lasttime.tm) == 0) 2052 timebuf[0] = '\0'; 2053 2054 iovlist_init(&il); 2055 switch (f->f_type) { 2056 case F_FORW: 2057 /* Message forwarded over the network. */ 2058 iovlist_append(&il, "<"); 2059 snprintf(priority_number, sizeof(priority_number), "%d", 2060 f->f_prevpri); 2061 iovlist_append(&il, priority_number); 2062 iovlist_append(&il, ">"); 2063 iovlist_append(&il, timebuf); 2064 if (strcasecmp(hostname, LocalHostName) != 0) { 2065 iovlist_append(&il, " Forwarded from "); 2066 iovlist_append(&il, hostname); 2067 iovlist_append(&il, ":"); 2068 } 2069 iovlist_append(&il, " "); 2070 break; 2071 2072 case F_WALL: 2073 /* Message written to terminals. */ 2074 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 2075 iovlist_append(&il, hostname); 2076 iovlist_append(&il, " at "); 2077 iovlist_append(&il, timebuf); 2078 iovlist_append(&il, " ...\r\n"); 2079 break; 2080 2081 default: 2082 /* Message written to files. */ 2083 iovlist_append(&il, timebuf); 2084 iovlist_append(&il, " "); 2085 2086 if (LogFacPri) { 2087 iovlist_append(&il, "<"); 2088 2089 facility = f->f_prevpri & LOG_FACMASK; 2090 facility_found = false; 2091 if (LogFacPri > 1) { 2092 for (c = facilitynames; c->c_name; c++) { 2093 if (c->c_val == facility) { 2094 iovlist_append(&il, c->c_name); 2095 facility_found = true; 2096 break; 2097 } 2098 } 2099 } 2100 if (!facility_found) { 2101 snprintf(facility_number, 2102 sizeof(facility_number), "%d", 2103 LOG_FAC(facility)); 2104 iovlist_append(&il, facility_number); 2105 } 2106 2107 iovlist_append(&il, "."); 2108 2109 priority = LOG_PRI(f->f_prevpri); 2110 priority_found = false; 2111 if (LogFacPri > 1) { 2112 for (c = prioritynames; c->c_name; c++) { 2113 if (c->c_val == priority) { 2114 iovlist_append(&il, c->c_name); 2115 priority_found = true; 2116 break; 2117 } 2118 } 2119 } 2120 if (!priority_found) { 2121 snprintf(priority_number, 2122 sizeof(priority_number), "%d", priority); 2123 iovlist_append(&il, priority_number); 2124 } 2125 2126 iovlist_append(&il, "> "); 2127 } 2128 2129 iovlist_append(&il, hostname); 2130 iovlist_append(&il, " "); 2131 break; 2132 } 2133 2134 /* Message body with application name and process ID prefixed. */ 2135 if (app_name != NULL) { 2136 iovlist_append(&il, app_name); 2137 if (procid != NULL) { 2138 iovlist_append(&il, "["); 2139 iovlist_append(&il, procid); 2140 iovlist_append(&il, "]"); 2141 } 2142 iovlist_append(&il, ": "); 2143 } 2144 iovlist_append(&il, msg); 2145 2146 fprintlog_write(f, &il, flags); 2147 } 2148 2149 static void 2150 fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2151 const char *procid, const char *msgid __unused, 2152 const char *structured_data __unused, const char *msg, int flags) 2153 { 2154 2155 dprintf("Logging to %s", TypeNames[f->f_type]); 2156 f->f_time = now; 2157 f->f_prevcount = 0; 2158 if (f->f_type == F_UNUSED) { 2159 dprintf("\n"); 2160 return; 2161 } 2162 2163 if (RFC3164OutputFormat) 2164 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2165 else 2166 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2167 structured_data, msg, flags); 2168 } 2169 2170 /* 2171 * Prints a message to a log file that the previously logged message was 2172 * received multiple times. 2173 */ 2174 static void 2175 fprintlog_successive(struct filed *f, int flags) 2176 { 2177 char msg[100]; 2178 2179 assert(f->f_prevcount > 0); 2180 snprintf(msg, sizeof(msg), "last message repeated %d times", 2181 f->f_prevcount); 2182 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2183 flags); 2184 } 2185 2186 /* 2187 * WALLMSG -- Write a message to the world at large 2188 * 2189 * Write the specified message to either the entire 2190 * world, or a list of approved users. 2191 */ 2192 static void 2193 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 2194 { 2195 static int reenter; /* avoid calling ourselves */ 2196 struct utmpx *ut; 2197 int i; 2198 const char *p; 2199 2200 if (reenter++) 2201 return; 2202 setutxent(); 2203 /* NOSTRICT */ 2204 while ((ut = getutxent()) != NULL) { 2205 if (ut->ut_type != USER_PROCESS) 2206 continue; 2207 if (f->f_type == F_WALL) { 2208 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2209 TTYMSGTIME)) != NULL) { 2210 errno = 0; /* already in msg */ 2211 logerror(p); 2212 } 2213 continue; 2214 } 2215 /* should we send the message to this user? */ 2216 for (i = 0; i < MAXUNAMES; i++) { 2217 if (!f->fu_uname[i][0]) 2218 break; 2219 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 2220 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2221 TTYMSGTIME)) != NULL) { 2222 errno = 0; /* already in msg */ 2223 logerror(p); 2224 } 2225 break; 2226 } 2227 } 2228 } 2229 endutxent(); 2230 reenter = 0; 2231 } 2232 2233 /* 2234 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2235 */ 2236 static const char * 2237 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2238 { 2239 static char device[1024]; 2240 static char errbuf[1024]; 2241 struct stat sb; 2242 2243 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2244 2245 if (stat(device, &sb) < 0) { 2246 (void) snprintf(errbuf, sizeof(errbuf), 2247 "%s: %s", device, strerror(errno)); 2248 return (errbuf); 2249 } 2250 if ((sb.st_mode & S_IWGRP) == 0) 2251 /* Messages disabled. */ 2252 return (NULL); 2253 return (ttymsg(iov, iovcnt, line, tmout)); 2254 } 2255 2256 /* 2257 * Return a printable representation of a host address. 2258 */ 2259 static const char * 2260 cvthname(struct sockaddr *f) 2261 { 2262 int error, hl; 2263 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2264 2265 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2266 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 2267 NI_NUMERICHOST); 2268 if (error) { 2269 dprintf("Malformed from address %s\n", gai_strerror(error)); 2270 return ("???"); 2271 } 2272 dprintf("cvthname(%s)\n", ip); 2273 2274 if (!resolve) 2275 return (ip); 2276 2277 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 2278 NULL, 0, NI_NAMEREQD); 2279 if (error) { 2280 dprintf("Host name for your address (%s) unknown\n", ip); 2281 return (ip); 2282 } 2283 hl = strlen(hname); 2284 if (hl > 0 && hname[hl-1] == '.') 2285 hname[--hl] = '\0'; 2286 /* RFC 5424 prefers logging FQDNs. */ 2287 if (RFC3164OutputFormat) 2288 trimdomain(hname, hl); 2289 return (hname); 2290 } 2291 2292 /* 2293 * Print syslogd errors some place. 2294 */ 2295 static void 2296 logerror(const char *msg) 2297 { 2298 char buf[512]; 2299 static int recursed = 0; 2300 2301 /* If there's an error while trying to log an error, give up. */ 2302 if (recursed) 2303 return; 2304 recursed++; 2305 if (errno != 0) { 2306 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2307 strerror(errno)); 2308 msg = buf; 2309 } 2310 errno = 0; 2311 dprintf("%s\n", msg); 2312 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2313 NULL, msg, 0); 2314 recursed--; 2315 } 2316 2317 static void 2318 die(int signo) 2319 { 2320 struct filed *f; 2321 struct socklist *sl; 2322 char buf[100]; 2323 2324 STAILQ_FOREACH(f, &fhead, next) { 2325 /* flush any pending output */ 2326 if (f->f_prevcount) 2327 fprintlog_successive(f, 0); 2328 /* close our end of the pipe */ 2329 if (f->f_type == F_PIPE) 2330 close_filed(f); 2331 } 2332 if (signo) { 2333 dprintf("syslogd: exiting on signal %d\n", signo); 2334 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2335 errno = 0; 2336 logerror(buf); 2337 } 2338 STAILQ_FOREACH(sl, &shead, next) { 2339 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) { 2340 if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) { 2341 dprintf("Failed to unlink %s: %s", sl->sl_name, 2342 strerror(errno)); 2343 } 2344 } 2345 } 2346 pidfile_remove(pfh); 2347 2348 exit(1); 2349 } 2350 2351 static int 2352 configfiles(const struct dirent *dp) 2353 { 2354 const char *p; 2355 size_t ext_len; 2356 2357 if (dp->d_name[0] == '.') 2358 return (0); 2359 2360 ext_len = sizeof(include_ext) -1; 2361 2362 if (dp->d_namlen <= ext_len) 2363 return (0); 2364 2365 p = &dp->d_name[dp->d_namlen - ext_len]; 2366 if (strcmp(p, include_ext) != 0) 2367 return (0); 2368 2369 return (1); 2370 } 2371 2372 static void 2373 parseconfigfile(FILE *cf, bool allow_includes) 2374 { 2375 FILE *cf2; 2376 struct dirent **ent; 2377 char cline[LINE_MAX]; 2378 char host[MAXHOSTNAMELEN]; 2379 char prog[LINE_MAX]; 2380 char file[MAXPATHLEN]; 2381 char pfilter[LINE_MAX]; 2382 char *p, *tmp; 2383 int i, nents; 2384 size_t include_len; 2385 2386 /* 2387 * Foreach line in the conf table, open that file. 2388 */ 2389 include_len = sizeof(include_str) - 1; 2390 (void)strlcpy(host, "*", sizeof(host)); 2391 (void)strlcpy(prog, "*", sizeof(prog)); 2392 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2393 while (fgets(cline, sizeof(cline), cf) != NULL) { 2394 /* 2395 * check for end-of-section, comments, strip off trailing 2396 * spaces and newline character. #!prog is treated specially: 2397 * following lines apply only to that program. 2398 */ 2399 for (p = cline; isspace(*p); ++p) 2400 continue; 2401 if (*p == '\0') 2402 continue; 2403 if (allow_includes && 2404 strncmp(p, include_str, include_len) == 0 && 2405 isspace(p[include_len])) { 2406 p += include_len; 2407 while (isspace(*p)) 2408 p++; 2409 tmp = p; 2410 while (*tmp != '\0' && !isspace(*tmp)) 2411 tmp++; 2412 *tmp = '\0'; 2413 dprintf("Trying to include files in '%s'\n", p); 2414 nents = scandir(p, &ent, configfiles, alphasort); 2415 if (nents == -1) { 2416 dprintf("Unable to open '%s': %s\n", p, 2417 strerror(errno)); 2418 continue; 2419 } 2420 for (i = 0; i < nents; i++) { 2421 if (snprintf(file, sizeof(file), "%s/%s", p, 2422 ent[i]->d_name) >= (int)sizeof(file)) { 2423 dprintf("ignoring path too long: " 2424 "'%s/%s'\n", p, ent[i]->d_name); 2425 free(ent[i]); 2426 continue; 2427 } 2428 free(ent[i]); 2429 cf2 = fopen(file, "r"); 2430 if (cf2 == NULL) 2431 continue; 2432 dprintf("reading %s\n", file); 2433 parseconfigfile(cf2, false); 2434 fclose(cf2); 2435 } 2436 free(ent); 2437 continue; 2438 } 2439 if (*p == '#') { 2440 p++; 2441 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2442 continue; 2443 } 2444 if (*p == '+' || *p == '-') { 2445 host[0] = *p++; 2446 while (isspace(*p)) 2447 p++; 2448 if (*p == '\0' || *p == '*') { 2449 (void)strlcpy(host, "*", sizeof(host)); 2450 continue; 2451 } 2452 if (*p == '@') 2453 p = LocalHostName; 2454 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2455 if (!isalnum(*p) && *p != '.' && *p != '-' 2456 && *p != ',' && *p != ':' && *p != '%') 2457 break; 2458 host[i] = *p++; 2459 } 2460 host[i] = '\0'; 2461 continue; 2462 } 2463 if (*p == '!') { 2464 p++; 2465 while (isspace(*p)) 2466 p++; 2467 if (*p == '\0' || *p == '*') { 2468 (void)strlcpy(prog, "*", sizeof(prog)); 2469 continue; 2470 } 2471 for (i = 0; i < LINE_MAX - 1; i++) { 2472 if (!isprint(p[i]) || isspace(p[i])) 2473 break; 2474 prog[i] = p[i]; 2475 } 2476 prog[i] = '\0'; 2477 continue; 2478 } 2479 if (*p == ':') { 2480 p++; 2481 while (isspace(*p)) 2482 p++; 2483 if (*p == '\0' || *p == '*') { 2484 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2485 continue; 2486 } 2487 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2488 continue; 2489 } 2490 for (p = cline + 1; *p != '\0'; p++) { 2491 if (*p != '#') 2492 continue; 2493 if (*(p - 1) == '\\') { 2494 strcpy(p - 1, p); 2495 p--; 2496 continue; 2497 } 2498 *p = '\0'; 2499 break; 2500 } 2501 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2502 cline[i] = '\0'; 2503 cfline(cline, prog, host, pfilter); 2504 } 2505 } 2506 2507 static void 2508 readconfigfile(const char *path) 2509 { 2510 FILE *cf; 2511 2512 if ((cf = fopen(path, "r")) != NULL) { 2513 parseconfigfile(cf, true); 2514 (void)fclose(cf); 2515 } else { 2516 dprintf("cannot open %s\n", ConfFile); 2517 cfline("*.ERR\t/dev/console", "*", "*", "*"); 2518 cfline("*.PANIC\t*", "*", "*", "*"); 2519 } 2520 } 2521 2522 /* 2523 * Close all open log files. 2524 */ 2525 static void 2526 closelogfiles(void) 2527 { 2528 struct filed *f; 2529 2530 while (!STAILQ_EMPTY(&fhead)) { 2531 f = STAILQ_FIRST(&fhead); 2532 STAILQ_REMOVE_HEAD(&fhead, next); 2533 2534 /* flush any pending output */ 2535 if (f->f_prevcount) 2536 fprintlog_successive(f, 0); 2537 2538 switch (f->f_type) { 2539 case F_FILE: 2540 case F_FORW: 2541 case F_CONSOLE: 2542 case F_TTY: 2543 case F_PIPE: 2544 close_filed(f); 2545 break; 2546 default: 2547 break; 2548 } 2549 2550 free(f->f_program); 2551 free(f->f_host); 2552 if (f->f_prop_filter) { 2553 switch (f->f_prop_filter->cmp_type) { 2554 case FILT_CMP_REGEX: 2555 regfree(f->f_prop_filter->pflt_re); 2556 free(f->f_prop_filter->pflt_re); 2557 break; 2558 case FILT_CMP_CONTAINS: 2559 case FILT_CMP_EQUAL: 2560 case FILT_CMP_STARTS: 2561 free(f->f_prop_filter->pflt_strval); 2562 break; 2563 } 2564 free(f->f_prop_filter); 2565 } 2566 free(f); 2567 } 2568 } 2569 2570 /* 2571 * INIT -- Initialize syslogd from configuration table 2572 */ 2573 static void 2574 init(bool reload) 2575 { 2576 int i; 2577 char *p; 2578 char oldLocalHostName[MAXHOSTNAMELEN]; 2579 char hostMsg[2*MAXHOSTNAMELEN+40]; 2580 char bootfileMsg[MAXLINE + 1]; 2581 2582 dprintf("init\n"); 2583 2584 /* 2585 * Load hostname (may have changed). 2586 */ 2587 if (reload) 2588 (void)strlcpy(oldLocalHostName, LocalHostName, 2589 sizeof(oldLocalHostName)); 2590 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2591 err(EX_OSERR, "gethostname() failed"); 2592 if ((p = strchr(LocalHostName, '.')) != NULL) { 2593 /* RFC 5424 prefers logging FQDNs. */ 2594 if (RFC3164OutputFormat) 2595 *p = '\0'; 2596 LocalDomain = p + 1; 2597 } else { 2598 LocalDomain = ""; 2599 } 2600 2601 /* 2602 * Load / reload timezone data (in case it changed). 2603 * 2604 * Just calling tzset() again does not work, the timezone code 2605 * caches the result. However, by setting the TZ variable, one 2606 * can defeat the caching and have the timezone code really 2607 * reload the timezone data. Respect any initial setting of 2608 * TZ, in case the system is configured specially. 2609 */ 2610 dprintf("loading timezone data via tzset()\n"); 2611 if (getenv("TZ")) { 2612 tzset(); 2613 } else { 2614 setenv("TZ", ":/etc/localtime", 1); 2615 tzset(); 2616 unsetenv("TZ"); 2617 } 2618 2619 Initialized = false; 2620 closelogfiles(); 2621 readconfigfile(ConfFile); 2622 Initialized = true; 2623 2624 if (Debug) { 2625 struct filed *f; 2626 int port; 2627 2628 STAILQ_FOREACH(f, &fhead, next) { 2629 for (i = 0; i <= LOG_NFACILITIES; i++) 2630 if (f->f_pmask[i] == INTERNAL_NOPRI) 2631 printf("X "); 2632 else 2633 printf("%d ", f->f_pmask[i]); 2634 printf("%s: ", TypeNames[f->f_type]); 2635 switch (f->f_type) { 2636 case F_FILE: 2637 printf("%s", f->fu_fname); 2638 break; 2639 2640 case F_CONSOLE: 2641 case F_TTY: 2642 printf("%s%s", _PATH_DEV, f->fu_fname); 2643 break; 2644 2645 case F_FORW: 2646 switch (f->fu_forw_addr->ai_family) { 2647 #ifdef INET 2648 case AF_INET: 2649 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2650 break; 2651 #endif 2652 #ifdef INET6 2653 case AF_INET6: 2654 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2655 break; 2656 #endif 2657 default: 2658 port = 0; 2659 } 2660 if (port != 514) { 2661 printf("%s:%d", 2662 f->fu_forw_hname, port); 2663 } else { 2664 printf("%s", f->fu_forw_hname); 2665 } 2666 break; 2667 2668 case F_PIPE: 2669 printf("%s", f->fu_pipe_pname); 2670 break; 2671 2672 case F_USERS: 2673 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2674 printf("%s, ", f->fu_uname[i]); 2675 break; 2676 default: 2677 break; 2678 } 2679 if (f->f_program) 2680 printf(" (%s)", f->f_program); 2681 printf("\n"); 2682 } 2683 } 2684 2685 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2686 NULL, NULL, "restart", 0); 2687 dprintf("syslogd: restarted\n"); 2688 /* 2689 * Log a change in hostname, but only on reload. 2690 */ 2691 if (reload && strcmp(oldLocalHostName, LocalHostName) != 0) { 2692 (void)snprintf(hostMsg, sizeof(hostMsg), 2693 "hostname changed, \"%s\" to \"%s\"", 2694 oldLocalHostName, LocalHostName); 2695 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2696 NULL, NULL, NULL, hostMsg, 0); 2697 dprintf("%s\n", hostMsg); 2698 } 2699 /* 2700 * Log the kernel boot file if we aren't going to use it as 2701 * the prefix, and if this is *not* a reload. 2702 */ 2703 if (!reload && !use_bootfile) { 2704 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2705 "kernel boot file is %s", bootfile); 2706 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2707 NULL, NULL, NULL, bootfileMsg, 0); 2708 dprintf("%s\n", bootfileMsg); 2709 } 2710 } 2711 2712 /* 2713 * Compile property-based filter. 2714 */ 2715 static struct prop_filter * 2716 prop_filter_compile(const char *cfilter) 2717 { 2718 struct prop_filter *pfilter; 2719 char *filter, *filter_endpos, *filter_begpos, *p; 2720 char **ap, *argv[2] = {NULL, NULL}; 2721 int re_flags = REG_NOSUB; 2722 int escaped; 2723 2724 pfilter = calloc(1, sizeof(*pfilter)); 2725 if (pfilter == NULL) { 2726 logerror("pfilter calloc"); 2727 exit(1); 2728 } 2729 if (*cfilter == '*') { 2730 pfilter->prop_type = FILT_PROP_NOOP; 2731 return (pfilter); 2732 } 2733 filter = strdup(cfilter); 2734 if (filter == NULL) { 2735 logerror("strdup"); 2736 exit(1); 2737 } 2738 filter_begpos = filter; 2739 2740 /* 2741 * Here's some filter examples mentioned in syslog.conf(5) 2742 * 'msg, contains, ".*Deny.*"' 2743 * 'programname, regex, "^bird6?$"' 2744 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2745 */ 2746 2747 /* 2748 * Split filter into 3 parts: property name (argv[0]), 2749 * cmp type (argv[1]) and lvalue for comparison (filter). 2750 */ 2751 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2752 if (**ap != '\0') 2753 if (++ap >= &argv[2]) 2754 break; 2755 } 2756 2757 if (argv[0] == NULL || argv[1] == NULL) { 2758 logerror("filter parse error"); 2759 goto error; 2760 } 2761 2762 /* fill in prop_type */ 2763 if (strcasecmp(argv[0], "msg") == 0) 2764 pfilter->prop_type = FILT_PROP_MSG; 2765 else if (strcasecmp(argv[0], "hostname") == 0) 2766 pfilter->prop_type = FILT_PROP_HOSTNAME; 2767 else if (strcasecmp(argv[0], "source") == 0) 2768 pfilter->prop_type = FILT_PROP_HOSTNAME; 2769 else if (strcasecmp(argv[0], "programname") == 0) 2770 pfilter->prop_type = FILT_PROP_PROGNAME; 2771 else { 2772 logerror("unknown property"); 2773 goto error; 2774 } 2775 2776 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2777 if (*argv[1] == '!') { 2778 pfilter->cmp_flags |= FILT_FLAG_EXCLUDE; 2779 argv[1]++; 2780 } 2781 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2782 pfilter->cmp_flags |= FILT_FLAG_ICASE; 2783 argv[1] += sizeof("icase_") - 1; 2784 } 2785 2786 /* fill in cmp_type */ 2787 if (strcasecmp(argv[1], "contains") == 0) 2788 pfilter->cmp_type = FILT_CMP_CONTAINS; 2789 else if (strcasecmp(argv[1], "isequal") == 0) 2790 pfilter->cmp_type = FILT_CMP_EQUAL; 2791 else if (strcasecmp(argv[1], "startswith") == 0) 2792 pfilter->cmp_type = FILT_CMP_STARTS; 2793 else if (strcasecmp(argv[1], "regex") == 0) 2794 pfilter->cmp_type = FILT_CMP_REGEX; 2795 else if (strcasecmp(argv[1], "ereregex") == 0) { 2796 pfilter->cmp_type = FILT_CMP_REGEX; 2797 re_flags |= REG_EXTENDED; 2798 } else { 2799 logerror("unknown cmp function"); 2800 goto error; 2801 } 2802 2803 /* 2804 * Handle filter value 2805 */ 2806 2807 /* ' ".*Deny.*"' */ 2808 /* remove leading whitespace and check for '"' next character */ 2809 filter += strspn(filter, ", \t\n"); 2810 if (*filter != '"' || strlen(filter) < 3) { 2811 logerror("property value parse error"); 2812 goto error; 2813 } 2814 filter++; 2815 2816 /* '.*Deny.*"' */ 2817 /* process possible backslash (\") escaping */ 2818 escaped = 0; 2819 filter_endpos = filter; 2820 for (p = filter; *p != '\0'; p++) { 2821 if (*p == '\\' && !escaped) { 2822 escaped = 1; 2823 /* do not shift filter_endpos */ 2824 continue; 2825 } 2826 if (*p == '"' && !escaped) { 2827 p++; 2828 break; 2829 } 2830 /* we've seen some esc symbols, need to compress the line */ 2831 if (filter_endpos != p) 2832 *filter_endpos = *p; 2833 2834 filter_endpos++; 2835 escaped = 0; 2836 } 2837 2838 *filter_endpos = '\0'; 2839 /* '.*Deny.*' */ 2840 2841 /* We should not have anything but whitespace left after closing '"' */ 2842 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2843 logerror("property value parse error"); 2844 goto error; 2845 } 2846 2847 if (pfilter->cmp_type == FILT_CMP_REGEX) { 2848 pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re)); 2849 if (pfilter->pflt_re == NULL) { 2850 logerror("RE calloc() error"); 2851 goto error; 2852 } 2853 if (pfilter->cmp_flags & FILT_FLAG_ICASE) 2854 re_flags |= REG_ICASE; 2855 if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) { 2856 logerror("RE compilation error"); 2857 goto error; 2858 } 2859 } else { 2860 pfilter->pflt_strval = strdup(filter); 2861 pfilter->pflt_strlen = strlen(filter); 2862 } 2863 2864 free(filter_begpos); 2865 return (pfilter); 2866 error: 2867 free(filter_begpos); 2868 free(pfilter->pflt_re); 2869 free(pfilter); 2870 return (NULL); 2871 } 2872 2873 static const char * 2874 parse_selector(const char *p, struct filed *f) 2875 { 2876 int i, pri; 2877 int pri_done = 0, pri_cmp = 0, pri_invert = 0; 2878 char *bp, buf[LINE_MAX], ebuf[100]; 2879 const char *q; 2880 2881 /* find the end of this facility name list */ 2882 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';) 2883 continue; 2884 2885 /* get the priority comparison */ 2886 if (*q == '!') { 2887 pri_invert = 1; 2888 q++; 2889 } 2890 while (!pri_done) { 2891 switch (*q) { 2892 case '<': 2893 pri_cmp |= PRI_LT; 2894 q++; 2895 break; 2896 case '=': 2897 pri_cmp |= PRI_EQ; 2898 q++; 2899 break; 2900 case '>': 2901 pri_cmp |= PRI_GT; 2902 q++; 2903 break; 2904 default: 2905 pri_done++; 2906 break; 2907 } 2908 } 2909 2910 /* collect priority name */ 2911 for (bp = buf; *q != '\0' && !strchr("\t,; ", *q); ) 2912 *bp++ = *q++; 2913 *bp = '\0'; 2914 2915 /* skip cruft */ 2916 while (strchr(",;", *q)) 2917 q++; 2918 2919 /* decode priority name */ 2920 if (*buf == '*') { 2921 pri = LOG_PRIMASK; 2922 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2923 } else { 2924 /* Ignore trailing spaces. */ 2925 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2926 buf[i] = '\0'; 2927 2928 pri = decode(buf, prioritynames); 2929 if (pri < 0) { 2930 errno = 0; 2931 (void)snprintf(ebuf, sizeof(ebuf), 2932 "unknown priority name \"%s\"", buf); 2933 logerror(ebuf); 2934 free(f); 2935 return (NULL); 2936 } 2937 } 2938 if (!pri_cmp) 2939 pri_cmp = UniquePriority ? PRI_EQ : (PRI_EQ | PRI_GT); 2940 if (pri_invert) 2941 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2942 2943 /* scan facilities */ 2944 while (*p != '\0' && !strchr("\t.; ", *p)) { 2945 for (bp = buf; *p != '\0' && !strchr("\t,;. ", *p); ) 2946 *bp++ = *p++; 2947 *bp = '\0'; 2948 2949 if (*buf == '*') { 2950 for (i = 0; i < LOG_NFACILITIES; i++) { 2951 f->f_pmask[i] = pri; 2952 f->f_pcmp[i] = pri_cmp; 2953 } 2954 } else { 2955 i = decode(buf, facilitynames); 2956 if (i < 0) { 2957 errno = 0; 2958 (void)snprintf(ebuf, sizeof(ebuf), 2959 "unknown facility name \"%s\"", 2960 buf); 2961 logerror(ebuf); 2962 free(f); 2963 return (NULL); 2964 } 2965 f->f_pmask[i >> 3] = pri; 2966 f->f_pcmp[i >> 3] = pri_cmp; 2967 } 2968 while (*p == ',' || *p == ' ') 2969 p++; 2970 } 2971 return (q); 2972 } 2973 2974 static void 2975 parse_action(const char *p, struct filed *f) 2976 { 2977 struct addrinfo hints, *res; 2978 int error, i; 2979 const char *q; 2980 bool syncfile; 2981 2982 if (*p == '-') { 2983 syncfile = false; 2984 p++; 2985 } else 2986 syncfile = true; 2987 2988 switch (*p) { 2989 case '@': 2990 { 2991 char *tp; 2992 char endkey = ':'; 2993 /* 2994 * scan forward to see if there is a port defined. 2995 * so we can't use strlcpy.. 2996 */ 2997 i = sizeof(f->fu_forw_hname); 2998 tp = f->fu_forw_hname; 2999 p++; 3000 3001 /* 3002 * an ipv6 address should start with a '[' in that case 3003 * we should scan for a ']' 3004 */ 3005 if (*p == '[') { 3006 p++; 3007 endkey = ']'; 3008 } 3009 while (*p && (*p != endkey) && (i-- > 0)) { 3010 *tp++ = *p++; 3011 } 3012 if (endkey == ']' && *p == endkey) 3013 p++; 3014 *tp = '\0'; 3015 } 3016 /* See if we copied a domain and have a port */ 3017 if (*p == ':') 3018 p++; 3019 else 3020 p = NULL; 3021 3022 hints = (struct addrinfo){ 3023 .ai_family = family, 3024 .ai_socktype = SOCK_DGRAM 3025 }; 3026 error = getaddrinfo(f->fu_forw_hname, 3027 p ? p : "syslog", &hints, &res); 3028 if (error) { 3029 logerror(gai_strerror(error)); 3030 break; 3031 } 3032 f->fu_forw_addr = res; 3033 f->f_type = F_FORW; 3034 break; 3035 3036 case '/': 3037 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3038 f->f_type = F_UNUSED; 3039 logerror(p); 3040 break; 3041 } 3042 if (syncfile) 3043 f->f_flags |= FFLAG_SYNC; 3044 if (isatty(f->f_file)) { 3045 if (strcmp(p, _PATH_CONSOLE) == 0) 3046 f->f_type = F_CONSOLE; 3047 else 3048 f->f_type = F_TTY; 3049 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 3050 sizeof(f->fu_fname)); 3051 } else { 3052 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 3053 f->f_type = F_FILE; 3054 } 3055 break; 3056 3057 case '|': 3058 f->fu_pipe_pd = -1; 3059 (void)strlcpy(f->fu_pipe_pname, p + 1, 3060 sizeof(f->fu_pipe_pname)); 3061 f->f_type = F_PIPE; 3062 break; 3063 3064 case '*': 3065 f->f_type = F_WALL; 3066 break; 3067 3068 default: 3069 for (i = 0; i < MAXUNAMES && *p; i++) { 3070 for (q = p; *q && *q != ','; ) 3071 q++; 3072 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 3073 if ((q - p) >= MAXLOGNAME) 3074 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 3075 else 3076 f->fu_uname[i][q - p] = '\0'; 3077 while (*q == ',' || *q == ' ') 3078 q++; 3079 p = q; 3080 } 3081 f->f_type = F_USERS; 3082 break; 3083 } 3084 } 3085 3086 /* 3087 * Crack a configuration file line 3088 */ 3089 static void 3090 cfline(const char *line, const char *prog, const char *host, 3091 const char *pfilter) 3092 { 3093 struct filed *f; 3094 const char *p; 3095 3096 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 3097 host, pfilter); 3098 3099 f = calloc(1, sizeof(*f)); 3100 if (f == NULL) { 3101 logerror("malloc"); 3102 exit(1); 3103 } 3104 errno = 0; /* keep strerror() stuff out of logerror messages */ 3105 3106 for (int i = 0; i <= LOG_NFACILITIES; i++) 3107 f->f_pmask[i] = INTERNAL_NOPRI; 3108 3109 /* save hostname if any */ 3110 if (host && *host == '*') 3111 host = NULL; 3112 if (host) { 3113 int hl; 3114 3115 f->f_host = strdup(host); 3116 if (f->f_host == NULL) { 3117 logerror("strdup"); 3118 exit(1); 3119 } 3120 hl = strlen(f->f_host); 3121 if (hl > 0 && f->f_host[hl-1] == '.') 3122 f->f_host[--hl] = '\0'; 3123 /* RFC 5424 prefers logging FQDNs. */ 3124 if (RFC3164OutputFormat) 3125 trimdomain(f->f_host, hl); 3126 } 3127 3128 /* save program name if any */ 3129 if (prog && *prog == '*') 3130 prog = NULL; 3131 if (prog) { 3132 f->f_program = strdup(prog); 3133 if (f->f_program == NULL) { 3134 logerror("strdup"); 3135 exit(1); 3136 } 3137 } 3138 3139 if (pfilter) { 3140 f->f_prop_filter = prop_filter_compile(pfilter); 3141 if (f->f_prop_filter == NULL) { 3142 logerror("filter compile error"); 3143 exit(1); 3144 } 3145 } 3146 3147 /* scan through the list of selectors */ 3148 for (p = line; *p != '\0' && *p != '\t' && *p != ' ';) 3149 p = parse_selector(p, f); 3150 3151 /* skip to action part */ 3152 while (*p == '\t' || *p == ' ') 3153 p++; 3154 parse_action(p, f); 3155 3156 STAILQ_INSERT_TAIL(&fhead, f, next); 3157 } 3158 3159 /* 3160 * Decode a symbolic name to a numeric value 3161 */ 3162 static int 3163 decode(const char *name, const CODE *codetab) 3164 { 3165 const CODE *c; 3166 char *p, buf[40]; 3167 3168 if (isdigit(*name)) 3169 return (atoi(name)); 3170 3171 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3172 if (isupper(*name)) 3173 *p = tolower(*name); 3174 else 3175 *p = *name; 3176 } 3177 *p = '\0'; 3178 for (c = codetab; c->c_name; c++) 3179 if (!strcmp(buf, c->c_name)) 3180 return (c->c_val); 3181 3182 return (-1); 3183 } 3184 3185 static void 3186 markit(void) 3187 { 3188 struct filed *f; 3189 struct deadq_entry *dq, *dq0; 3190 3191 now = time((time_t *)NULL); 3192 MarkSeq += TIMERINTVL; 3193 if (MarkSeq >= MarkInterval) { 3194 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3195 "-- MARK --", MARK); 3196 MarkSeq = 0; 3197 } 3198 3199 STAILQ_FOREACH(f, &fhead, next) { 3200 if (f->f_prevcount && now >= REPEATTIME(f)) { 3201 dprintf("flush %s: repeated %d times, %d sec.\n", 3202 TypeNames[f->f_type], f->f_prevcount, 3203 repeatinterval[f->f_repeatcount]); 3204 fprintlog_successive(f, 0); 3205 BACKOFF(f); 3206 } 3207 } 3208 3209 /* Walk the dead queue, and see if we should signal somebody. */ 3210 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3211 switch (dq->dq_timeout) { 3212 case 0: 3213 /* Already signalled once, try harder now. */ 3214 (void)pdkill(dq->dq_procdesc, SIGKILL); 3215 (void)deadq_remove(dq); 3216 break; 3217 3218 case 1: 3219 if (pdkill(dq->dq_procdesc, SIGTERM) != 0) 3220 (void)deadq_remove(dq); 3221 else 3222 dq->dq_timeout--; 3223 break; 3224 default: 3225 dq->dq_timeout--; 3226 } 3227 } 3228 (void)alarm(TIMERINTVL); 3229 } 3230 3231 /* 3232 * fork off and become a daemon, but wait for the child to come online 3233 * before returning to the parent, or we get disk thrashing at boot etc. 3234 */ 3235 static int 3236 waitdaemon(int maxwait) 3237 { 3238 struct pollfd pollfd; 3239 int events, pipefd[2], status; 3240 pid_t pid; 3241 3242 if (pipe(pipefd) == -1) { 3243 warn("failed to daemonize, pipe"); 3244 die(0); 3245 } 3246 pid = fork(); 3247 if (pid == -1) { 3248 warn("failed to daemonize, fork"); 3249 die(0); 3250 } else if (pid > 0) { 3251 close(pipefd[1]); 3252 pollfd.fd = pipefd[0]; 3253 pollfd.events = POLLHUP; 3254 events = poll(&pollfd, 1, maxwait * 1000); 3255 if (events == -1) 3256 err(1, "failed to daemonize, poll"); 3257 else if (events == 0) 3258 errx(1, "timed out waiting for child"); 3259 if (waitpid(pid, &status, WNOHANG) > 0) { 3260 if (WIFEXITED(status)) 3261 errx(1, "child pid %d exited with return code %d", 3262 pid, WEXITSTATUS(status)); 3263 if (WIFSIGNALED(status)) 3264 errx(1, "child pid %d exited on signal %d%s", 3265 pid, WTERMSIG(status), 3266 WCOREDUMP(status) ? " (core dumped)" : ""); 3267 } 3268 exit(0); 3269 } 3270 close(pipefd[0]); 3271 if (setsid() == -1) { 3272 warn("failed to daemonize, setsid"); 3273 die(0); 3274 } 3275 (void)chdir("/"); 3276 (void)dup2(nulldesc, STDIN_FILENO); 3277 (void)dup2(nulldesc, STDOUT_FILENO); 3278 (void)dup2(nulldesc, STDERR_FILENO); 3279 return (pipefd[1]); 3280 } 3281 3282 /* 3283 * Add `s' to the list of allowable peer addresses to accept messages 3284 * from. 3285 * 3286 * `s' is a string in the form: 3287 * 3288 * [*]domainname[:{servicename|portnumber|*}] 3289 * 3290 * or 3291 * 3292 * netaddr/maskbits[:{servicename|portnumber|*}] 3293 * 3294 * Returns false on error, true if the argument was valid. 3295 */ 3296 static bool 3297 #if defined(INET) || defined(INET6) 3298 allowaddr(char *s) 3299 #else 3300 allowaddr(char *s __unused) 3301 #endif 3302 { 3303 #if defined(INET) || defined(INET6) 3304 char *cp1, *cp2; 3305 struct allowedpeer *ap; 3306 struct servent *se; 3307 int masklen = -1; 3308 struct addrinfo hints, *res = NULL; 3309 #ifdef INET 3310 in_addr_t *addrp, *maskp; 3311 #endif 3312 #ifdef INET6 3313 uint32_t *addr6p, *mask6p; 3314 #endif 3315 char ip[NI_MAXHOST]; 3316 3317 ap = calloc(1, sizeof(*ap)); 3318 if (ap == NULL) 3319 err(1, "malloc failed"); 3320 3321 #ifdef INET6 3322 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3323 #endif 3324 cp1 = s; 3325 if ((cp1 = strrchr(cp1, ':'))) { 3326 /* service/port provided */ 3327 *cp1++ = '\0'; 3328 if (strlen(cp1) == 1 && *cp1 == '*') 3329 /* any port allowed */ 3330 ap->port = 0; 3331 else if ((se = getservbyname(cp1, "udp"))) { 3332 ap->port = ntohs(se->s_port); 3333 } else { 3334 ap->port = strtol(cp1, &cp2, 0); 3335 /* port not numeric */ 3336 if (*cp2 != '\0') 3337 goto err; 3338 } 3339 } else { 3340 if ((se = getservbyname("syslog", "udp"))) 3341 ap->port = ntohs(se->s_port); 3342 else 3343 /* sanity, should not happen */ 3344 ap->port = 514; 3345 } 3346 3347 if ((cp1 = strchr(s, '/')) != NULL && 3348 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3349 *cp1 = '\0'; 3350 if ((masklen = atoi(cp1 + 1)) < 0) 3351 goto err; 3352 } 3353 #ifdef INET6 3354 if (*s == '[') { 3355 cp2 = s + strlen(s) - 1; 3356 if (*cp2 == ']') { 3357 ++s; 3358 *cp2 = '\0'; 3359 } else { 3360 cp2 = NULL; 3361 } 3362 } else { 3363 cp2 = NULL; 3364 } 3365 #endif 3366 hints = (struct addrinfo){ 3367 .ai_family = PF_UNSPEC, 3368 .ai_socktype = SOCK_DGRAM, 3369 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3370 }; 3371 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3372 ap->isnumeric = true; 3373 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3374 ap->a_mask = (struct sockaddr_storage){ 3375 .ss_family = res->ai_family, 3376 .ss_len = res->ai_addrlen 3377 }; 3378 switch (res->ai_family) { 3379 #ifdef INET 3380 case AF_INET: 3381 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3382 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3383 if (masklen < 0) { 3384 /* use default netmask */ 3385 if (IN_CLASSA(ntohl(*addrp))) 3386 *maskp = htonl(IN_CLASSA_NET); 3387 else if (IN_CLASSB(ntohl(*addrp))) 3388 *maskp = htonl(IN_CLASSB_NET); 3389 else 3390 *maskp = htonl(IN_CLASSC_NET); 3391 } else if (masklen == 0) { 3392 *maskp = 0; 3393 } else if (masklen <= 32) { 3394 /* convert masklen to netmask */ 3395 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3396 } else { 3397 goto err; 3398 } 3399 /* Lose any host bits in the network number. */ 3400 *addrp &= *maskp; 3401 break; 3402 #endif 3403 #ifdef INET6 3404 case AF_INET6: 3405 if (masklen > 128) 3406 goto err; 3407 3408 if (masklen < 0) 3409 masklen = 128; 3410 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3411 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3412 /* convert masklen to netmask */ 3413 while (masklen > 0) { 3414 if (masklen < 32) { 3415 *mask6p = 3416 htonl(~(0xffffffff >> masklen)); 3417 *addr6p &= *mask6p; 3418 break; 3419 } else { 3420 *mask6p++ = 0xffffffff; 3421 addr6p++; 3422 masklen -= 32; 3423 } 3424 } 3425 break; 3426 #endif 3427 default: 3428 goto err; 3429 } 3430 freeaddrinfo(res); 3431 } else { 3432 /* arg `s' is domain name */ 3433 ap->isnumeric = false; 3434 ap->a_name = s; 3435 if (cp1) 3436 *cp1 = '/'; 3437 #ifdef INET6 3438 if (cp2) { 3439 *cp2 = ']'; 3440 --s; 3441 } 3442 #endif 3443 } 3444 STAILQ_INSERT_TAIL(&aphead, ap, next); 3445 3446 if (Debug) { 3447 printf("allowaddr: rule "); 3448 if (ap->isnumeric) { 3449 printf("numeric, "); 3450 getnameinfo(sstosa(&ap->a_addr), 3451 (sstosa(&ap->a_addr))->sa_len, 3452 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3453 printf("addr = %s, ", ip); 3454 getnameinfo(sstosa(&ap->a_mask), 3455 (sstosa(&ap->a_mask))->sa_len, 3456 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3457 printf("mask = %s; ", ip); 3458 } else { 3459 printf("domainname = %s; ", ap->a_name); 3460 } 3461 printf("port = %d\n", ap->port); 3462 } 3463 3464 return (true); 3465 err: 3466 if (res != NULL) 3467 freeaddrinfo(res); 3468 free(ap); 3469 #endif 3470 return (false); 3471 } 3472 3473 /* 3474 * Validate that the remote peer has permission to log to us. 3475 */ 3476 static bool 3477 validate(struct sockaddr *sa, const char *hname) 3478 { 3479 int i; 3480 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3481 struct allowedpeer *ap; 3482 #ifdef INET 3483 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3484 #endif 3485 #ifdef INET6 3486 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3487 #endif 3488 struct addrinfo hints, *res; 3489 u_short sport; 3490 3491 /* traditional behaviour, allow everything */ 3492 if (STAILQ_EMPTY(&aphead)) 3493 return (true); 3494 3495 (void)strlcpy(name, hname, sizeof(name)); 3496 hints = (struct addrinfo){ 3497 .ai_family = PF_UNSPEC, 3498 .ai_socktype = SOCK_DGRAM, 3499 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3500 }; 3501 if (getaddrinfo(name, NULL, &hints, &res) == 0) 3502 freeaddrinfo(res); 3503 else if (strchr(name, '.') == NULL) { 3504 strlcat(name, ".", sizeof(name)); 3505 strlcat(name, LocalDomain, sizeof(name)); 3506 } 3507 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 3508 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3509 return (false); /* for safety, should not occur */ 3510 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3511 ip, port, name); 3512 sport = atoi(port); 3513 3514 /* now, walk down the list */ 3515 i = 0; 3516 STAILQ_FOREACH(ap, &aphead, next) { 3517 i++; 3518 if (ap->port != 0 && ap->port != sport) { 3519 dprintf("rejected in rule %d due to port mismatch.\n", 3520 i); 3521 continue; 3522 } 3523 3524 if (ap->isnumeric) { 3525 if (ap->a_addr.ss_family != sa->sa_family) { 3526 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3527 continue; 3528 } 3529 #ifdef INET 3530 else if (ap->a_addr.ss_family == AF_INET) { 3531 sin4 = satosin(sa); 3532 a4p = satosin(&ap->a_addr); 3533 m4p = satosin(&ap->a_mask); 3534 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3535 != a4p->sin_addr.s_addr) { 3536 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3537 continue; 3538 } 3539 } 3540 #endif 3541 #ifdef INET6 3542 else if (ap->a_addr.ss_family == AF_INET6) { 3543 sin6 = satosin6(sa); 3544 a6p = satosin6(&ap->a_addr); 3545 m6p = satosin6(&ap->a_mask); 3546 if (a6p->sin6_scope_id != 0 && 3547 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3548 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3549 continue; 3550 } 3551 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3552 &a6p->sin6_addr, &m6p->sin6_addr)) { 3553 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3554 continue; 3555 } 3556 } 3557 #endif 3558 else 3559 continue; 3560 } else { 3561 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3562 FNM_NOMATCH) { 3563 dprintf("rejected in rule %d due to name " 3564 "mismatch.\n", i); 3565 continue; 3566 } 3567 } 3568 dprintf("accepted in rule %d.\n", i); 3569 return (true); /* hooray! */ 3570 } 3571 return (false); 3572 } 3573 3574 /* 3575 * Fairly similar to popen(3), but returns an open descriptor, as 3576 * opposed to a FILE *. 3577 */ 3578 static int 3579 p_open(const char *prog, int *rpd) 3580 { 3581 struct sigaction act = { }; 3582 int pfd[2], pd; 3583 pid_t pid; 3584 char *argv[4]; /* sh -c cmd NULL */ 3585 char errmsg[200]; 3586 3587 if (pipe(pfd) == -1) 3588 return (-1); 3589 3590 switch ((pid = pdfork(&pd, PD_CLOEXEC))) { 3591 case -1: 3592 return (-1); 3593 3594 case 0: 3595 (void)setsid(); /* Avoid catching SIGHUPs. */ 3596 argv[0] = strdup("sh"); 3597 argv[1] = strdup("-c"); 3598 argv[2] = strdup(prog); 3599 argv[3] = NULL; 3600 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 3601 logerror("strdup"); 3602 exit(1); 3603 } 3604 3605 alarm(0); 3606 act.sa_handler = SIG_DFL; 3607 for (size_t i = 0; i < nitems(sigcatch); ++i) { 3608 if (sigaction(sigcatch[i], &act, NULL) == -1) { 3609 logerror("sigaction"); 3610 exit(1); 3611 } 3612 } 3613 3614 dup2(pfd[0], STDIN_FILENO); 3615 dup2(nulldesc, STDOUT_FILENO); 3616 dup2(nulldesc, STDERR_FILENO); 3617 closefrom(STDERR_FILENO + 1); 3618 3619 (void)execvp(_PATH_BSHELL, argv); 3620 _exit(255); 3621 } 3622 close(pfd[0]); 3623 /* 3624 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3625 * supposed to get an EWOULDBLOCK on writev(2), which is 3626 * caught by the logic above anyway, which will in turn close 3627 * the pipe, and fork a new logging subprocess if necessary. 3628 * The stale subprocess will be killed some time later unless 3629 * it terminated itself due to closing its input pipe (so we 3630 * get rid of really dead puppies). 3631 */ 3632 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3633 /* This is bad. */ 3634 (void)snprintf(errmsg, sizeof(errmsg), 3635 "Warning: cannot change pipe to PID %d to " 3636 "non-blocking behaviour.", 3637 (int)pid); 3638 logerror(errmsg); 3639 } 3640 *rpd = pd; 3641 return (pfd[1]); 3642 } 3643 3644 static void 3645 deadq_enter(int pd) 3646 { 3647 struct deadq_entry *dq; 3648 3649 if (pd == -1) 3650 return; 3651 3652 dq = malloc(sizeof(*dq)); 3653 if (dq == NULL) { 3654 logerror("malloc"); 3655 exit(1); 3656 } 3657 3658 dq->dq_procdesc = pd; 3659 dq->dq_timeout = DQ_TIMO_INIT; 3660 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3661 } 3662 3663 static void 3664 deadq_remove(struct deadq_entry *dq) 3665 { 3666 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3667 close(dq->dq_procdesc); 3668 free(dq); 3669 } 3670 3671 static struct socklist * 3672 socksetup(struct addrinfo *ai, const char *name, mode_t mode) 3673 { 3674 struct socklist *sl; 3675 int (*sl_recv)(struct socklist *); 3676 int s, optval = 1; 3677 3678 if (ai->ai_family != AF_LOCAL && SecureMode > 1) { 3679 /* Only AF_LOCAL in secure mode. */ 3680 return (NULL); 3681 } 3682 if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL && 3683 ai->ai_family != family) 3684 return (NULL); 3685 3686 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 3687 if (s < 0) { 3688 logerror("socket"); 3689 return (NULL); 3690 } 3691 #ifdef INET6 3692 if (ai->ai_family == AF_INET6) { 3693 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval, 3694 sizeof(int)) < 0) { 3695 logerror("setsockopt(IPV6_V6ONLY)"); 3696 close(s); 3697 return (NULL); 3698 } 3699 } 3700 #endif 3701 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval, 3702 sizeof(int)) < 0) { 3703 logerror("setsockopt(SO_REUSEADDR)"); 3704 close(s); 3705 return (NULL); 3706 } 3707 3708 /* 3709 * Bind INET and UNIX-domain sockets. 3710 * 3711 * A UNIX-domain socket is always bound to a pathname 3712 * regardless of -N flag. 3713 * 3714 * For INET sockets, RFC 3164 recommends that client 3715 * side message should come from the privileged syslogd port. 3716 * 3717 * If the system administrator chooses not to obey 3718 * this, we can skip the bind() step so that the 3719 * system will choose a port for us. 3720 */ 3721 if (ai->ai_family == AF_LOCAL) 3722 unlink(name); 3723 if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) { 3724 if (bind(s, ai->ai_addr, ai->ai_addrlen) < 0) { 3725 logerror("bind"); 3726 close(s); 3727 return (NULL); 3728 } 3729 if (ai->ai_family == AF_LOCAL || SecureMode == 0) 3730 increase_rcvbuf(s); 3731 } 3732 if (ai->ai_family == AF_LOCAL && chmod(name, mode) < 0) { 3733 dprintf("chmod %s: %s\n", name, strerror(errno)); 3734 close(s); 3735 return (NULL); 3736 } 3737 dprintf("new socket fd is %d\n", s); 3738 sl_recv = socklist_recv_sock; 3739 #if defined(INET) || defined(INET6) 3740 if (SecureMode && (ai->ai_family == AF_INET || 3741 ai->ai_family == AF_INET6)) { 3742 dprintf("shutdown\n"); 3743 /* Forbid communication in secure mode. */ 3744 if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) { 3745 logerror("shutdown"); 3746 if (!Debug) 3747 die(0); 3748 } 3749 sl_recv = NULL; 3750 } else 3751 #endif 3752 dprintf("listening on socket\n"); 3753 dprintf("sending on socket\n"); 3754 /* Copy *ai->ai_addr to the tail of struct socklist if any. */ 3755 sl = calloc(1, sizeof(*sl) + ai->ai_addrlen); 3756 if (sl == NULL) 3757 err(1, "malloc failed"); 3758 sl->sl_socket = s; 3759 if (ai->ai_family == AF_LOCAL) { 3760 char *name2 = strdup(name); 3761 if (name2 == NULL) 3762 err(1, "strdup failed"); 3763 sl->sl_name = strdup(basename(name2)); 3764 sl->sl_dirfd = open(dirname(name2), O_DIRECTORY); 3765 if (sl->sl_name == NULL || sl->sl_dirfd == -1) 3766 err(1, "failed to save dir info for %s", name); 3767 free(name2); 3768 } 3769 sl->sl_recv = sl_recv; 3770 (void)memcpy(&sl->sl_ai, ai, sizeof(*ai)); 3771 if (ai->ai_addrlen > 0) { 3772 (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); 3773 sl->sl_sa = (struct sockaddr *)(sl + 1); 3774 } else { 3775 sl->sl_sa = NULL; 3776 } 3777 return (sl); 3778 } 3779 3780 static void 3781 increase_rcvbuf(int fd) 3782 { 3783 socklen_t len; 3784 3785 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3786 &(socklen_t){sizeof(len)}) == 0) { 3787 if (len < RCVBUF_MINSIZE) { 3788 len = RCVBUF_MINSIZE; 3789 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3790 } 3791 } 3792 } 3793