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 * Author: Eric Allman 71 * extensive changes by Ralph Campbell 72 * more extensive changes by Eric Allman (again) 73 * Extension to log by program name as well as facility and priority 74 * by Peter da Silva. 75 * -u and -v by Harlan Stenn. 76 * Priority comparison code by Harlan Stenn. 77 */ 78 79 #define DEFUPRI (LOG_USER|LOG_NOTICE) 80 #define DEFSPRI (LOG_KERN|LOG_CRIT) 81 #define TIMERINTVL 30 /* interval for checking flush, mark */ 82 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 83 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 84 85 #include <sys/param.h> 86 #include <sys/event.h> 87 #include <sys/ioctl.h> 88 #include <sys/mman.h> 89 #include <sys/procdesc.h> 90 #include <sys/queue.h> 91 #include <sys/resource.h> 92 #include <sys/socket.h> 93 #include <sys/stat.h> 94 #include <sys/syslimits.h> 95 #include <sys/time.h> 96 #include <sys/uio.h> 97 #include <sys/un.h> 98 #include <sys/wait.h> 99 100 #if defined(INET) || defined(INET6) 101 #include <netinet/in.h> 102 #include <arpa/inet.h> 103 #endif 104 105 #include <assert.h> 106 #include <ctype.h> 107 #include <dirent.h> 108 #include <err.h> 109 #include <errno.h> 110 #include <fcntl.h> 111 #include <fnmatch.h> 112 #include <libgen.h> 113 #include <libutil.h> 114 #include <limits.h> 115 #include <netdb.h> 116 #include <paths.h> 117 #include <poll.h> 118 #include <regex.h> 119 #include <signal.h> 120 #include <stdbool.h> 121 #include <stddef.h> 122 #include <stdio.h> 123 #include <stdlib.h> 124 #include <string.h> 125 #include <sysexits.h> 126 #include <unistd.h> 127 #include <utmpx.h> 128 129 #include "pathnames.h" 130 #include "syslogd.h" 131 #include "syslogd_cap.h" 132 133 const char *ConfFile = _PATH_LOGCONF; 134 static const char *PidFile = _PATH_LOGPID; 135 static const char include_str[] = "include"; 136 static const char include_ext[] = ".conf"; 137 138 #define dprintf if (Debug) printf 139 140 #define sstosa(ss) ((struct sockaddr *)(ss)) 141 #ifdef INET 142 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 143 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 144 #endif 145 #ifdef INET6 146 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 147 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 148 #define s6_addr32 __u6_addr.__u6_addr32 149 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 150 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 151 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 152 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 153 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 154 #endif 155 156 /* 157 * List of peers and sockets that can't be bound until 158 * flags have been parsed. 159 */ 160 struct peer { 161 const char *pe_name; 162 const char *pe_serv; 163 mode_t pe_mode; 164 STAILQ_ENTRY(peer) next; 165 }; 166 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 167 168 /* 169 * Sockets used for logging; monitored by kevent(). 170 */ 171 struct socklist { 172 struct addrinfo sl_ai; 173 #define sl_sa sl_ai.ai_addr 174 #define sl_salen sl_ai.ai_addrlen 175 #define sl_family sl_ai.ai_family 176 int sl_socket; 177 char *sl_name; 178 int sl_dirfd; 179 int (*sl_recv)(struct socklist *); 180 STAILQ_ENTRY(socklist) next; 181 }; 182 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 183 184 /* 185 * Flags to logmsg(). 186 */ 187 188 #define IGN_CONS 0x001 /* don't print on console */ 189 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 190 #define MARK 0x008 /* this message is a mark */ 191 #define ISKERNEL 0x010 /* kernel generated message */ 192 193 /* Traditional syslog timestamp format. */ 194 #define RFC3164_DATELEN 15 195 #define RFC3164_DATEFMT "%b %e %H:%M:%S" 196 197 /* 198 * FORMAT_BSD_LEGACY and FORMAT_RFC3164_STRICT are two variations of 199 * the RFC 3164 logging format. 200 */ 201 #define IS_RFC3164_FORMAT (output_format == FORMAT_BSD_LEGACY || \ 202 output_format == FORMAT_RFC3164_STRICT) 203 204 static STAILQ_HEAD(, filed) fhead = 205 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 206 static struct filed consfile; /* Console */ 207 208 /* 209 * Queue of about-to-be dead processes we should watch out for. 210 */ 211 struct deadq_entry { 212 int dq_procdesc; 213 int dq_timeout; 214 TAILQ_ENTRY(deadq_entry) dq_entries; 215 }; 216 static TAILQ_HEAD(, deadq_entry) deadq_head = 217 TAILQ_HEAD_INITIALIZER(deadq_head); 218 219 /* 220 * The timeout to apply to processes waiting on the dead queue. Unit 221 * of measure is `mark intervals', i.e. 20 minutes by default. 222 * Processes on the dead queue will be terminated after that time. 223 */ 224 225 #define DQ_TIMO_INIT 2 226 227 /* 228 * Network addresses that are allowed to log to us. 229 */ 230 struct allowedpeer { 231 bool isnumeric; 232 u_short port; 233 union { 234 struct { 235 struct sockaddr_storage addr; 236 struct sockaddr_storage mask; 237 } numeric; 238 char *name; 239 } u; 240 #define a_addr u.numeric.addr 241 #define a_mask u.numeric.mask 242 #define a_name u.name 243 STAILQ_ENTRY(allowedpeer) next; 244 }; 245 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 246 247 /* 248 * Intervals at which we flush out "message repeated" messages, 249 * in seconds after previous message is logged. After each flush, 250 * we move to the next interval until we reach the largest. 251 */ 252 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 253 #define MAXREPEAT (nitems(repeatinterval) - 1) 254 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 255 #define BACKOFF(f) do { \ 256 if (++(f)->f_repeatcount > MAXREPEAT) \ 257 (f)->f_repeatcount = MAXREPEAT; \ 258 } while (0) 259 260 static const char *TypeNames[] = { 261 "UNUSED", 262 "FILE", 263 "TTY", 264 "CONSOLE", 265 "FORW", 266 "USERS", 267 "WALL", 268 "PIPE", 269 }; 270 271 static const int sigcatch[] = { 272 SIGHUP, 273 SIGINT, 274 SIGQUIT, 275 SIGPIPE, 276 SIGALRM, 277 SIGTERM, 278 SIGCHLD, 279 }; 280 281 /* 282 * Communication channels between syslogd and libcasper 283 * services. These channels are used to request external 284 * resources while in capability mode. 285 */ 286 #ifdef WITH_CASPER 287 static cap_channel_t *cap_syslogd; 288 static cap_channel_t *cap_net; 289 #endif 290 291 static int nulldesc; /* /dev/null descriptor */ 292 static bool Debug; /* debug flag */ 293 static bool Foreground = false; /* Run in foreground, instead of daemonizing */ 294 static bool resolve = true; /* resolve hostname */ 295 char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 296 static const char *LocalDomain; /* our local domain name */ 297 static bool Initialized; /* set when we have initialized ourselves */ 298 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 299 static int MarkSeq; /* mark sequence number */ 300 static bool NoBind; /* don't bind() as suggested by RFC 3164 */ 301 static int SecureMode; /* when true, receive only unix domain socks */ 302 static int MaxForwardLen = 1024; /* max length of forwared message */ 303 #ifdef INET6 304 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 305 #else 306 static int family = PF_INET; /* protocol family (IPv4 only) */ 307 #endif 308 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 309 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 310 static int use_bootfile; /* log entire bootfile for every kern msg */ 311 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 312 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 313 314 static char bootfile[MAXPATHLEN]; /* booted kernel file */ 315 316 static bool RemoteAddDate; /* Always set the date on remote messages */ 317 static bool RemoteHostname; /* Log remote hostname from the message */ 318 319 static bool UniquePriority; /* Only log specified priority? */ 320 static int LogFacPri; /* Put facility and priority in log message: */ 321 /* 0=no, 1=numeric, 2=names */ 322 static bool KeepKernFac; /* Keep remotely logged kernel facility */ 323 static bool needdofsync = true; /* Are any file(s) waiting to be fsynced? */ 324 static struct pidfh *pfh; 325 static enum { 326 FORMAT_BSD_LEGACY, /* default, RFC 3164 with legacy deviations */ 327 FORMAT_RFC3164_STRICT, /* compliant to RFC 3164 recommendataions */ 328 FORMAT_RFC5424, /* RFC 5424 format */ 329 } output_format = FORMAT_BSD_LEGACY; 330 static int kq; /* kqueue(2) descriptor. */ 331 332 struct iovlist; 333 334 static bool allowaddr(char *); 335 static void addpeer(const char *, const char *, mode_t); 336 static void addsock(const char *, const char *, mode_t); 337 static void cfline(nvlist_t *, const char *, const char *, const char *, 338 const char *); 339 static const char *cvthname(struct sockaddr *); 340 static struct deadq_entry *deadq_enter(int); 341 static void deadq_remove(struct deadq_entry *); 342 static int decode(const char *, const CODE *); 343 static void die(int) __dead2; 344 static void dofsync(void); 345 static void fprintlog_first(struct filed *, const char *, const char *, 346 const char *, const char *, const char *, const char *, int); 347 static void fprintlog_write(struct filed *, struct iovlist *, int); 348 static void fprintlog_successive(struct filed *, int); 349 static void init(bool); 350 static void logmsg(int, const struct logtime *, const char *, const char *, 351 const char *, const char *, const char *, const char *, int); 352 static void log_deadchild(int, int, const struct filed *); 353 static void markit(void); 354 static struct socklist *socksetup(struct addrinfo *, const char *, mode_t); 355 static int socklist_recv_file(struct socklist *); 356 static int socklist_recv_sock(struct socklist *); 357 static int skip_message(const char *, const char *, int); 358 static int evaluate_prop_filter(const struct prop_filter *filter, 359 const char *value); 360 static nvlist_t *prop_filter_compile(const char *); 361 static void parsemsg(const char *, char *); 362 static void printsys(char *); 363 static const char *ttymsg_check(struct iovec *, int, char *, int); 364 static void usage(void); 365 static bool validate(struct sockaddr *, const char *); 366 static void unmapped(struct sockaddr *); 367 static int waitdaemon(int); 368 static void increase_rcvbuf(int); 369 370 static void 371 close_filed(struct filed *f) 372 { 373 if (f->f_type == F_FORW && f->f_addr_fds != NULL) { 374 free(f->f_addrs); 375 for (size_t i = 0; i < f->f_num_addr_fds; ++i) 376 close(f->f_addr_fds[i]); 377 free(f->f_addr_fds); 378 f->f_addr_fds = NULL; 379 f->f_num_addr_fds = 0; 380 } else if (f->f_type == F_PIPE && f->f_procdesc != -1) { 381 f->f_dq = deadq_enter(f->f_procdesc); 382 } 383 384 f->f_type = F_UNUSED; 385 386 if (f->f_file != -1) 387 (void)close(f->f_file); 388 f->f_file = -1; 389 } 390 391 static void 392 addpeer(const char *name, const char *serv, mode_t mode) 393 { 394 struct peer *pe = calloc(1, sizeof(*pe)); 395 if (pe == NULL) 396 err(1, "malloc failed"); 397 pe->pe_name = name; 398 pe->pe_serv = serv; 399 pe->pe_mode = mode; 400 STAILQ_INSERT_TAIL(&pqueue, pe, next); 401 } 402 403 static void 404 addsock(const char *name, const char *serv, mode_t mode) 405 { 406 struct addrinfo hints = { }, *res, *res0; 407 struct socklist *sl; 408 int error; 409 char *cp, *msgbuf; 410 411 /* 412 * We have to handle this case for backwards compatibility: 413 * If there are two (or more) colons but no '[' and ']', 414 * assume this is an inet6 address without a service. 415 */ 416 if (name != NULL) { 417 #ifdef INET6 418 if (name[0] == '[' && 419 (cp = strchr(name + 1, ']')) != NULL) { 420 name = &name[1]; 421 *cp = '\0'; 422 if (cp[1] == ':' && cp[2] != '\0') 423 serv = cp + 2; 424 } else { 425 #endif 426 cp = strchr(name, ':'); 427 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 428 *cp = '\0'; 429 if (cp[1] != '\0') 430 serv = cp + 1; 431 if (cp == name) 432 name = NULL; 433 } 434 #ifdef INET6 435 } 436 #endif 437 } 438 hints.ai_family = AF_UNSPEC; 439 hints.ai_socktype = SOCK_DGRAM; 440 hints.ai_flags = AI_PASSIVE; 441 if (name != NULL) 442 dprintf("Trying peer: %s\n", name); 443 if (serv == NULL) 444 serv = "syslog"; 445 error = getaddrinfo(name, serv, &hints, &res0); 446 if (error == EAI_NONAME && name == NULL && SecureMode > 1) { 447 /* 448 * If we're in secure mode, we won't open inet sockets anyway. 449 * This failure can arise legitimately when running in a jail 450 * without networking. 451 */ 452 return; 453 } 454 if (error) { 455 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 456 name == NULL ? "" : name, serv, 457 gai_strerror(error)); 458 errno = 0; 459 if (msgbuf == NULL) 460 logerror(gai_strerror(error)); 461 else 462 logerror(msgbuf); 463 free(msgbuf); 464 die(0); 465 } 466 for (res = res0; res != NULL; res = res->ai_next) { 467 sl = socksetup(res, name, mode); 468 if (sl == NULL) 469 continue; 470 STAILQ_INSERT_TAIL(&shead, sl, next); 471 } 472 freeaddrinfo(res0); 473 } 474 475 static void 476 addfile(int fd) 477 { 478 struct socklist *sl = calloc(1, sizeof(*sl)); 479 if (sl == NULL) 480 err(1, "malloc failed"); 481 sl->sl_socket = fd; 482 sl->sl_recv = socklist_recv_file; 483 STAILQ_INSERT_TAIL(&shead, sl, next); 484 } 485 486 int 487 main(int argc, char *argv[]) 488 { 489 struct sigaction act = { }; 490 struct kevent ev; 491 struct socklist *sl; 492 pid_t spid; 493 int ch, ppipe_w = -1, s; 494 char *p; 495 bool bflag = false, pflag = false, Sflag = false; 496 497 if (madvise(NULL, 0, MADV_PROTECT) != 0) 498 dprintf("madvise() failed: %s\n", strerror(errno)); 499 500 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) 501 != -1) 502 switch (ch) { 503 #ifdef INET 504 case '4': 505 family = PF_INET; 506 break; 507 #endif 508 #ifdef INET6 509 case '6': 510 family = PF_INET6; 511 break; 512 #endif 513 case '8': 514 mask_C1 = 0; 515 break; 516 case 'A': 517 send_to_all = true; 518 break; 519 case 'a': /* allow specific network addresses only */ 520 if (!allowaddr(optarg)) 521 usage(); 522 break; 523 case 'b': 524 bflag = true; 525 p = strchr(optarg, ']'); 526 if (p != NULL) 527 p = strchr(p + 1, ':'); 528 else { 529 p = strchr(optarg, ':'); 530 if (p != NULL && strchr(p + 1, ':') != NULL) 531 p = NULL; /* backward compatibility */ 532 } 533 if (p == NULL) { 534 /* A hostname or filename only. */ 535 addpeer(optarg, "syslog", 0); 536 } else { 537 /* The case of "name:service". */ 538 *p++ = '\0'; 539 addpeer(strlen(optarg) == 0 ? NULL : optarg, 540 p, 0); 541 } 542 break; 543 case 'c': 544 no_compress++; 545 break; 546 case 'C': 547 logflags |= O_CREAT; 548 break; 549 case 'd': /* debug */ 550 Debug = true; 551 break; 552 case 'f': /* configuration file */ 553 ConfFile = optarg; 554 break; 555 case 'F': /* run in foreground instead of daemon */ 556 Foreground = true; 557 break; 558 case 'H': 559 RemoteHostname = true; 560 break; 561 case 'k': /* keep remote kern fac */ 562 KeepKernFac = true; 563 break; 564 case 'l': 565 case 'p': 566 case 'S': 567 { 568 long perml; 569 mode_t mode; 570 char *name, *ep; 571 572 if (ch == 'l') 573 mode = DEFFILEMODE; 574 else if (ch == 'p') { 575 mode = DEFFILEMODE; 576 pflag = true; 577 } else { 578 mode = S_IRUSR | S_IWUSR; 579 Sflag = true; 580 } 581 if (optarg[0] == '/') 582 name = optarg; 583 else if ((name = strchr(optarg, ':')) != NULL) { 584 *name++ = '\0'; 585 if (name[0] != '/') 586 errx(1, "socket name must be absolute " 587 "path"); 588 if (isdigit(*optarg)) { 589 perml = strtol(optarg, &ep, 8); 590 if (*ep || perml < 0 || 591 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 592 errx(1, "invalid mode %s, exiting", 593 optarg); 594 mode = (mode_t )perml; 595 } else 596 errx(1, "invalid mode %s, exiting", 597 optarg); 598 } else 599 errx(1, "invalid filename %s, exiting", 600 optarg); 601 addpeer(name, NULL, mode); 602 break; 603 } 604 case 'M': /* max length of forwarded message */ 605 MaxForwardLen = atoi(optarg); 606 if (MaxForwardLen < 480) 607 errx(1, "minimum length limit of forwarded " 608 "messages is 480 bytes"); 609 break; 610 case 'm': /* mark interval */ 611 MarkInterval = atoi(optarg) * 60; 612 break; 613 case 'N': 614 NoBind = true; 615 if (!SecureMode) 616 SecureMode = 1; 617 break; 618 case 'n': 619 resolve = false; 620 break; 621 case 'O': 622 if (strcmp(optarg, "bsd") == 0 || 623 strcmp(optarg, "rfc3164") == 0) 624 output_format = FORMAT_BSD_LEGACY; 625 else if (strcmp(optarg, "rfc3164-strict") == 0) 626 output_format = FORMAT_RFC3164_STRICT; 627 else if (strcmp(optarg, "syslog") == 0 || 628 strcmp(optarg, "rfc5424") == 0) 629 output_format = FORMAT_RFC5424; 630 else 631 usage(); 632 break; 633 case 'o': 634 use_bootfile = true; 635 break; 636 case 'P': /* path for alt. PID */ 637 PidFile = optarg; 638 break; 639 case 's': /* no network mode */ 640 SecureMode++; 641 break; 642 case 'T': 643 RemoteAddDate = true; 644 break; 645 case 'u': /* only log specified priority */ 646 UniquePriority = true; 647 break; 648 case 'v': /* log facility and priority */ 649 LogFacPri++; 650 break; 651 default: 652 usage(); 653 } 654 if ((argc -= optind) != 0) 655 usage(); 656 657 if (IS_RFC3164_FORMAT && MaxForwardLen > 1024) 658 errx(1, "RFC 3164 messages may not exceed 1024 bytes"); 659 660 pfh = pidfile_open(PidFile, 0600, &spid); 661 if (pfh == NULL) { 662 if (errno == EEXIST) 663 errx(1, "syslogd already running, pid: %d", spid); 664 warn("cannot open pid file"); 665 } 666 667 /* 668 * Now that flags have been parsed, we know if we're in 669 * secure mode. Add peers to the socklist, if allowed. 670 */ 671 while (!STAILQ_EMPTY(&pqueue)) { 672 struct peer *pe = STAILQ_FIRST(&pqueue); 673 STAILQ_REMOVE_HEAD(&pqueue, next); 674 addsock(pe->pe_name, pe->pe_serv, pe->pe_mode); 675 free(pe); 676 } 677 /* Listen by default: /dev/klog. */ 678 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 679 if (s < 0) { 680 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 681 } else { 682 addfile(s); 683 } 684 /* Listen by default: *:514 if no -b flag. */ 685 if (bflag == 0) 686 addsock(NULL, "syslog", 0); 687 /* Listen by default: /var/run/log if no -p flag. */ 688 if (pflag == 0) 689 addsock(_PATH_LOG, NULL, DEFFILEMODE); 690 /* Listen by default: /var/run/logpriv if no -S flag. */ 691 if (Sflag == 0) 692 addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR); 693 694 consfile.f_type = F_CONSOLE; 695 consfile.f_file = -1; 696 (void)strlcpy(consfile.f_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1, 697 sizeof(consfile.f_fname)); 698 699 nulldesc = open(_PATH_DEVNULL, O_RDWR); 700 if (nulldesc == -1) { 701 warn("cannot open %s", _PATH_DEVNULL); 702 pidfile_remove(pfh); 703 exit(1); 704 } 705 706 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 707 708 if (!Foreground && !Debug) 709 ppipe_w = waitdaemon(30); 710 else if (Debug) 711 setlinebuf(stdout); 712 713 kq = kqueue(); 714 if (kq == -1) { 715 warn("failed to initialize kqueue"); 716 pidfile_remove(pfh); 717 exit(1); 718 } 719 STAILQ_FOREACH(sl, &shead, next) { 720 if (sl->sl_recv == NULL) 721 continue; 722 EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl); 723 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 724 warn("failed to add kevent to kqueue"); 725 pidfile_remove(pfh); 726 exit(1); 727 } 728 } 729 730 /* 731 * Syslogd will not reap its children via wait(). 732 * When SIGCHLD is ignored, zombie processes are 733 * not created. A child's PID will be recycled 734 * upon its exit. 735 */ 736 act.sa_handler = SIG_IGN; 737 for (size_t i = 0; i < nitems(sigcatch); ++i) { 738 EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 739 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 740 warn("failed to add kevent to kqueue"); 741 pidfile_remove(pfh); 742 exit(1); 743 } 744 if (sigaction(sigcatch[i], &act, NULL) == -1) { 745 warn("failed to apply signal handler"); 746 pidfile_remove(pfh); 747 exit(1); 748 } 749 } 750 (void)alarm(TIMERINTVL); 751 752 /* tuck my process id away */ 753 pidfile_write(pfh); 754 755 dprintf("off & running....\n"); 756 init(false); 757 for (;;) { 758 if (needdofsync) { 759 dofsync(); 760 if (ppipe_w != -1) { 761 /* 762 * Close our end of the pipe so our 763 * parent knows that we have finished 764 * initialization. 765 */ 766 (void)close(ppipe_w); 767 ppipe_w = -1; 768 } 769 } 770 if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) { 771 if (errno != EINTR) 772 logerror("kevent"); 773 continue; 774 } 775 switch (ev.filter) { 776 case EVFILT_READ: 777 sl = ev.udata; 778 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 779 sl->sl_recv(sl); 780 break; 781 case EVFILT_SIGNAL: 782 switch (ev.ident) { 783 case SIGHUP: 784 /* Reload */ 785 init(true); 786 break; 787 case SIGINT: 788 case SIGQUIT: 789 /* Ignore these unless -F and / or -d */ 790 if (!Foreground && !Debug) 791 break; 792 /* FALLTHROUGH */ 793 case SIGTERM: 794 /* Terminate */ 795 die(ev.ident); 796 break; 797 case SIGALRM: 798 /* Mark and flush */ 799 markit(); 800 break; 801 } 802 break; 803 case EVFILT_PROCDESC: 804 if ((ev.fflags & NOTE_EXIT) != 0) { 805 struct filed *f = ev.udata; 806 807 log_deadchild(f->f_procdesc, ev.data, f); 808 (void)close(f->f_procdesc); 809 810 f->f_procdesc = -1; 811 if (f->f_dq != NULL) { 812 deadq_remove(f->f_dq); 813 f->f_dq = NULL; 814 } 815 816 /* 817 * If it is unused, then it was already closed. 818 * Free the file data in this case. 819 */ 820 if (f->f_type == F_UNUSED) 821 free(f); 822 } 823 break; 824 } 825 } 826 } 827 828 static int 829 socklist_recv_sock(struct socklist *sl) 830 { 831 struct sockaddr_storage ss; 832 struct sockaddr *sa = (struct sockaddr *)&ss; 833 socklen_t sslen; 834 const char *hname; 835 char line[MAXLINE + 1]; 836 int len; 837 838 sslen = sizeof(ss); 839 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 840 dprintf("received sa_len = %d\n", sslen); 841 if (len == 0) 842 return (-1); 843 if (len < 0) { 844 if (errno != EINTR) 845 logerror("recvfrom"); 846 return (-1); 847 } 848 /* Received valid data. */ 849 line[len] = '\0'; 850 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 851 hname = LocalHostName; 852 else { 853 hname = cvthname(sa); 854 unmapped(sa); 855 if (validate(sa, hname) == 0) { 856 dprintf("Message from %s was ignored.", hname); 857 return (-1); 858 } 859 } 860 parsemsg(hname, line); 861 862 return (0); 863 } 864 865 static void 866 unmapped(struct sockaddr *sa) 867 { 868 #if defined(INET) && defined(INET6) 869 struct sockaddr_in6 *sin6; 870 struct sockaddr_in sin; 871 872 if (sa == NULL || 873 sa->sa_family != AF_INET6 || 874 sa->sa_len != sizeof(*sin6)) 875 return; 876 sin6 = satosin6(sa); 877 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 878 return; 879 sin = (struct sockaddr_in){ 880 .sin_family = AF_INET, 881 .sin_len = sizeof(sin), 882 .sin_port = sin6->sin6_port 883 }; 884 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 885 sizeof(sin.sin_addr)); 886 memcpy(sa, &sin, sizeof(sin)); 887 #else 888 if (sa == NULL) 889 return; 890 #endif 891 } 892 893 static void 894 usage(void) 895 { 896 897 fprintf(stderr, 898 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 899 " [-b bind_address] [-f config_file]\n" 900 " [-l [mode:]path] [-M fwd_length]\n" 901 " [-m mark_interval] [-O format] [-P pid_file]\n" 902 " [-p log_socket] [-S logpriv_socket]\n"); 903 exit(1); 904 } 905 906 /* 907 * Removes characters from log messages that are unsafe to display. 908 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 909 */ 910 static void 911 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 912 { 913 char *q; 914 int c; 915 916 q = out; 917 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 918 if (mask_C1 && (c & 0x80) && c < 0xA0) { 919 c &= 0x7F; 920 *q++ = 'M'; 921 *q++ = '-'; 922 } 923 if (isascii(c) && iscntrl(c)) { 924 if (c == '\n') { 925 *q++ = ' '; 926 } else if (c == '\t') { 927 *q++ = '\t'; 928 } else { 929 *q++ = '^'; 930 *q++ = c ^ 0100; 931 } 932 } else { 933 *q++ = c; 934 } 935 } 936 *q = '\0'; 937 } 938 939 /* 940 * Parses a syslog message according to RFC 5424, assuming that PRI and 941 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 942 * parsed result is passed to logmsg(). 943 */ 944 static void 945 parsemsg_rfc5424(const char *from, int pri, char *msg) 946 { 947 const struct logtime *timestamp; 948 struct logtime timestamp_remote; 949 const char *omsg, *hostname, *app_name, *procid, *msgid, 950 *structured_data; 951 char line[MAXLINE + 1]; 952 953 #define FAIL_IF(field, expr) do { \ 954 if (expr) { \ 955 dprintf("Failed to parse " field " from %s: %s\n", \ 956 from, omsg); \ 957 return; \ 958 } \ 959 } while (0) 960 #define PARSE_CHAR(field, sep) do { \ 961 FAIL_IF(field, *msg != sep); \ 962 ++msg; \ 963 } while (0) 964 #define IF_NOT_NILVALUE(var) \ 965 if (msg[0] == '-' && msg[1] == ' ') { \ 966 msg += 2; \ 967 var = NULL; \ 968 } else if (msg[0] == '-' && msg[1] == '\0') { \ 969 ++msg; \ 970 var = NULL; \ 971 } else 972 973 omsg = msg; 974 IF_NOT_NILVALUE(timestamp) { 975 /* Parse RFC 3339-like timestamp. */ 976 #define PARSE_NUMBER(dest, length, min, max) do { \ 977 int i, v; \ 978 \ 979 v = 0; \ 980 for (i = 0; i < length; ++i) { \ 981 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 982 v = v * 10 + *msg++ - '0'; \ 983 } \ 984 FAIL_IF("TIMESTAMP", v < min || v > max); \ 985 dest = v; \ 986 } while (0) 987 /* Date and time. */ 988 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 989 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 990 timestamp_remote.tm.tm_year -= 1900; 991 PARSE_CHAR("TIMESTAMP", '-'); 992 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 993 --timestamp_remote.tm.tm_mon; 994 PARSE_CHAR("TIMESTAMP", '-'); 995 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 996 PARSE_CHAR("TIMESTAMP", 'T'); 997 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 998 PARSE_CHAR("TIMESTAMP", ':'); 999 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1000 PARSE_CHAR("TIMESTAMP", ':'); 1001 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1002 /* Perform normalization. */ 1003 timegm(×tamp_remote.tm); 1004 /* Optional: fractional seconds. */ 1005 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1006 int i; 1007 1008 ++msg; 1009 for (i = 100000; i != 0; i /= 10) { 1010 if (*msg < '0' || *msg > '9') 1011 break; 1012 timestamp_remote.usec += (*msg++ - '0') * i; 1013 } 1014 } 1015 /* Timezone. */ 1016 if (*msg == 'Z') { 1017 /* UTC. */ 1018 ++msg; 1019 } else { 1020 int sign, tz_hour, tz_min; 1021 1022 /* Local time zone offset. */ 1023 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1024 sign = *msg++ == '-' ? -1 : 1; 1025 PARSE_NUMBER(tz_hour, 2, 0, 23); 1026 PARSE_CHAR("TIMESTAMP", ':'); 1027 PARSE_NUMBER(tz_min, 2, 0, 59); 1028 timestamp_remote.tm.tm_gmtoff = 1029 sign * (tz_hour * 3600 + tz_min * 60); 1030 } 1031 #undef PARSE_NUMBER 1032 PARSE_CHAR("TIMESTAMP", ' '); 1033 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1034 } 1035 1036 /* String fields part of the HEADER. */ 1037 #define PARSE_STRING(field, var) \ 1038 IF_NOT_NILVALUE(var) { \ 1039 var = msg; \ 1040 while (*msg >= '!' && *msg <= '~') \ 1041 ++msg; \ 1042 FAIL_IF(field, var == msg); \ 1043 PARSE_CHAR(field, ' '); \ 1044 msg[-1] = '\0'; \ 1045 } 1046 PARSE_STRING("HOSTNAME", hostname); 1047 if (hostname == NULL || !RemoteHostname) 1048 hostname = from; 1049 PARSE_STRING("APP-NAME", app_name); 1050 PARSE_STRING("PROCID", procid); 1051 PARSE_STRING("MSGID", msgid); 1052 #undef PARSE_STRING 1053 1054 /* Structured data. */ 1055 #define PARSE_SD_NAME() do { \ 1056 const char *start; \ 1057 \ 1058 start = msg; \ 1059 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1060 *msg != ']' && *msg != '"') \ 1061 ++msg; \ 1062 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1063 } while (0) 1064 IF_NOT_NILVALUE(structured_data) { 1065 structured_data = msg; 1066 /* SD-ELEMENT. */ 1067 while (*msg == '[') { 1068 ++msg; 1069 /* SD-ID. */ 1070 PARSE_SD_NAME(); 1071 /* SD-PARAM. */ 1072 while (*msg == ' ') { 1073 ++msg; 1074 /* PARAM-NAME. */ 1075 PARSE_SD_NAME(); 1076 PARSE_CHAR("STRUCTURED-NAME", '='); 1077 PARSE_CHAR("STRUCTURED-NAME", '"'); 1078 while (*msg != '"') { 1079 FAIL_IF("STRUCTURED-NAME", 1080 *msg == '\0'); 1081 if (*msg++ == '\\') { 1082 FAIL_IF("STRUCTURED-NAME", 1083 *msg == '\0'); 1084 ++msg; 1085 } 1086 } 1087 ++msg; 1088 } 1089 PARSE_CHAR("STRUCTURED-NAME", ']'); 1090 } 1091 PARSE_CHAR("STRUCTURED-NAME", ' '); 1092 msg[-1] = '\0'; 1093 } 1094 #undef PARSE_SD_NAME 1095 1096 #undef FAIL_IF 1097 #undef PARSE_CHAR 1098 #undef IF_NOT_NILVALUE 1099 1100 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1101 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1102 structured_data, line, 0); 1103 } 1104 1105 /* 1106 * Returns the length of the application name ("TAG" in RFC 3164 1107 * terminology) and process ID from a message if present. 1108 */ 1109 static void 1110 parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, 1111 ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) 1112 { 1113 const char *m, *procid_begin; 1114 size_t app_name_length, procid_length; 1115 1116 m = msg; 1117 1118 /* Application name. */ 1119 app_name_length = strspn(m, 1120 "abcdefghijklmnopqrstuvwxyz" 1121 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1122 "0123456789" 1123 "_-/"); 1124 if (app_name_length == 0) 1125 goto bad; 1126 m += app_name_length; 1127 1128 /* Process identifier (optional). */ 1129 if (*m == '[') { 1130 procid_begin = ++m; 1131 procid_length = strspn(m, "0123456789"); 1132 if (procid_length == 0) 1133 goto bad; 1134 m += procid_length; 1135 if (*m++ != ']') 1136 goto bad; 1137 } else { 1138 procid_begin = NULL; 1139 procid_length = 0; 1140 } 1141 1142 /* Separator. */ 1143 if (m[0] != ':' || m[1] != ' ') 1144 goto bad; 1145 1146 *app_name_length_p = app_name_length; 1147 if (procid_begin_offset_p != NULL) 1148 *procid_begin_offset_p = 1149 procid_begin == NULL ? 0 : procid_begin - msg; 1150 if (procid_length_p != NULL) 1151 *procid_length_p = procid_length; 1152 return; 1153 bad: 1154 *app_name_length_p = 0; 1155 if (procid_begin_offset_p != NULL) 1156 *procid_begin_offset_p = 0; 1157 if (procid_length_p != NULL) 1158 *procid_length_p = 0; 1159 } 1160 1161 /* 1162 * Trims the application name ("TAG" in RFC 3164 terminology) and 1163 * process ID from a message if present. 1164 */ 1165 static void 1166 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1167 const char **procid) 1168 { 1169 char *m, *app_name_begin, *procid_begin; 1170 size_t app_name_length, procid_length; 1171 ptrdiff_t procid_begin_offset; 1172 1173 m = *msg; 1174 app_name_begin = m; 1175 1176 parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, 1177 &procid_begin_offset, &procid_length); 1178 if (app_name_length == 0) 1179 goto bad; 1180 procid_begin = procid_begin_offset == 0 ? NULL : 1181 app_name_begin + procid_begin_offset; 1182 1183 /* Split strings from input. */ 1184 app_name_begin[app_name_length] = '\0'; 1185 m += app_name_length; 1186 if (procid_begin != NULL) { 1187 procid_begin[procid_length] = '\0'; 1188 /* Skip "[PID]". */ 1189 m += procid_length + 2; 1190 } 1191 1192 /* Skip separator ": ". */ 1193 *msg = m + 2; 1194 *app_name = app_name_begin; 1195 *procid = procid_begin; 1196 return; 1197 bad: 1198 *app_name = NULL; 1199 *procid = NULL; 1200 } 1201 1202 /* 1203 * Parses a syslog message according to RFC 3164, assuming that PRI 1204 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1205 * result is passed to logmsg(). 1206 */ 1207 static void 1208 parsemsg_rfc3164(const char *from, int pri, char *msg) 1209 { 1210 struct tm tm_parsed; 1211 const struct logtime *timestamp; 1212 struct logtime timestamp_remote; 1213 const char *app_name, *procid; 1214 size_t i, msglen; 1215 char line[MAXLINE + 1]; 1216 1217 /* 1218 * Parse the TIMESTAMP provided by the remote side. If none is 1219 * found, assume this is not an RFC 3164 formatted message, 1220 * only containing a TAG and a MSG. 1221 */ 1222 timestamp = NULL; 1223 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1224 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1225 msg += RFC3164_DATELEN + 1; 1226 if (!RemoteAddDate) { 1227 struct tm tm_now; 1228 time_t t_now; 1229 int year; 1230 1231 /* 1232 * As the timestamp does not contain the year 1233 * number, daylight saving time information, nor 1234 * a time zone, attempt to infer it. Due to 1235 * clock skews, the timestamp may even be part 1236 * of the next year. Use the last year for which 1237 * the timestamp is at most one week in the 1238 * future. 1239 * 1240 * This loop can only run for at most three 1241 * iterations before terminating. 1242 */ 1243 t_now = time(NULL); 1244 localtime_r(&t_now, &tm_now); 1245 for (year = tm_now.tm_year + 1;; --year) { 1246 assert(year >= tm_now.tm_year - 1); 1247 timestamp_remote.tm = tm_parsed; 1248 timestamp_remote.tm.tm_year = year; 1249 timestamp_remote.tm.tm_isdst = -1; 1250 timestamp_remote.usec = 0; 1251 if (mktime(×tamp_remote.tm) < 1252 t_now + 7 * 24 * 60 * 60) 1253 break; 1254 } 1255 timestamp = ×tamp_remote; 1256 } 1257 1258 /* 1259 * A single space character MUST also follow the HOSTNAME field. 1260 */ 1261 msglen = strlen(msg); 1262 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1263 if (msg[i] == ' ') { 1264 if (RemoteHostname) { 1265 msg[i] = '\0'; 1266 from = msg; 1267 } 1268 msg += i + 1; 1269 break; 1270 } 1271 /* 1272 * Support non RFC compliant messages, without hostname. 1273 */ 1274 if (msg[i] == ':') 1275 break; 1276 } 1277 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1278 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1279 return; 1280 } 1281 } 1282 1283 /* Remove the TAG, if present. */ 1284 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1285 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1286 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1287 } 1288 1289 /* 1290 * Takes a raw input line, extracts PRI and determines whether the 1291 * message is formatted according to RFC 3164 or RFC 5424. Continues 1292 * parsing of addition fields in the message according to those 1293 * standards and prints the message on the appropriate log files. 1294 */ 1295 static void 1296 parsemsg(const char *from, char *msg) 1297 { 1298 char *q; 1299 long n; 1300 size_t i; 1301 int pri; 1302 1303 i = -1; 1304 pri = DEFUPRI; 1305 1306 /* Parse PRI. */ 1307 if (msg[0] == '<' && isdigit(msg[1])) { 1308 for (i = 2; i <= 4; i++) { 1309 if (msg[i] == '>') { 1310 errno = 0; 1311 n = strtol(msg + 1, &q, 10); 1312 if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) { 1313 pri = n; 1314 msg += i + 1; 1315 i = 0; 1316 } 1317 break; 1318 } 1319 } 1320 } 1321 1322 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1323 pri = DEFUPRI; 1324 1325 /* 1326 * Don't allow users to log kernel messages. 1327 * NOTE: since LOG_KERN == 0 this will also match 1328 * messages with no facility specified. 1329 */ 1330 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1331 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1332 1333 /* Parse VERSION. */ 1334 if (i == 0 && msg[0] == '1' && msg[1] == ' ') 1335 parsemsg_rfc5424(from, pri, msg + 2); 1336 else 1337 parsemsg_rfc3164(from, pri, msg); 1338 } 1339 1340 /* 1341 * Read /dev/klog while data are available, split into lines. 1342 */ 1343 static int 1344 socklist_recv_file(struct socklist *sl) 1345 { 1346 char *p, *q, line[MAXLINE + 1]; 1347 int len, i; 1348 1349 len = 0; 1350 for (;;) { 1351 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1352 if (i > 0) { 1353 line[i + len] = '\0'; 1354 } else { 1355 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1356 logerror("klog"); 1357 close(sl->sl_socket); 1358 sl->sl_socket = -1; 1359 } 1360 break; 1361 } 1362 1363 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1364 *q = '\0'; 1365 printsys(p); 1366 } 1367 len = strlen(p); 1368 if (len >= MAXLINE - 1) { 1369 printsys(p); 1370 len = 0; 1371 } 1372 if (len > 0) 1373 memmove(line, p, len + 1); 1374 } 1375 if (len > 0) 1376 printsys(line); 1377 1378 return (len); 1379 } 1380 1381 /* 1382 * Take a raw input line from /dev/klog, format similar to syslog(). 1383 */ 1384 static void 1385 printsys(char *msg) 1386 { 1387 char *p, *q; 1388 long n; 1389 int flags, isprintf, pri; 1390 1391 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1392 p = msg; 1393 pri = DEFSPRI; 1394 isprintf = 1; 1395 if (*p == '<') { 1396 errno = 0; 1397 n = strtol(p + 1, &q, 10); 1398 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1399 p = q + 1; 1400 pri = n; 1401 isprintf = 0; 1402 } 1403 } 1404 /* 1405 * Kernel printf's and LOG_CONSOLE messages have been displayed 1406 * on the console already. 1407 */ 1408 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1409 flags |= IGN_CONS; 1410 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1411 pri = DEFSPRI; 1412 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1413 } 1414 1415 static time_t now; 1416 1417 /* 1418 * Match a program or host name against a specification. 1419 * Return a non-0 value if the message must be ignored 1420 * based on the specification. 1421 */ 1422 static int 1423 skip_message(const char *name, const char *spec, int checkcase) 1424 { 1425 const char *s; 1426 char prev, next; 1427 int exclude = 0; 1428 /* Behaviour on explicit match */ 1429 1430 if (spec == NULL || *spec == '\0') 1431 return (0); 1432 switch (*spec) { 1433 case '-': 1434 exclude = 1; 1435 /*FALLTHROUGH*/ 1436 case '+': 1437 spec++; 1438 break; 1439 default: 1440 break; 1441 } 1442 if (checkcase) 1443 s = strstr (spec, name); 1444 else 1445 s = strcasestr (spec, name); 1446 1447 if (s != NULL) { 1448 prev = (s == spec ? ',' : *(s - 1)); 1449 next = *(s + strlen (name)); 1450 1451 if (prev == ',' && (next == '\0' || next == ',')) 1452 /* Explicit match: skip iff the spec is an 1453 exclusive one. */ 1454 return (exclude); 1455 } 1456 1457 /* No explicit match for this name: skip the message iff 1458 the spec is an inclusive one. */ 1459 return (!exclude); 1460 } 1461 1462 /* 1463 * Match some property of the message against a filter. 1464 * Return a non-0 value if the message must be ignored 1465 * based on the filter. 1466 */ 1467 static int 1468 evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1469 { 1470 const char *s = NULL; 1471 const int exclude = ((filter->cmp_flags & FILT_FLAG_EXCLUDE) > 0); 1472 size_t valuelen; 1473 1474 if (value == NULL) 1475 return (-1); 1476 1477 if (filter->cmp_type == FILT_CMP_REGEX) { 1478 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1479 return (exclude); 1480 else 1481 return (!exclude); 1482 } 1483 1484 valuelen = strlen(value); 1485 1486 /* a shortcut for equal with different length is always false */ 1487 if (filter->cmp_type == FILT_CMP_EQUAL && 1488 valuelen != strlen(filter->pflt_strval)) 1489 return (!exclude); 1490 1491 if (filter->cmp_flags & FILT_FLAG_ICASE) 1492 s = strcasestr(value, filter->pflt_strval); 1493 else 1494 s = strstr(value, filter->pflt_strval); 1495 1496 /* 1497 * FILT_CMP_CONTAINS true if s 1498 * FILT_CMP_STARTS true if s && s == value 1499 * FILT_CMP_EQUAL true if s && s == value && 1500 * valuelen == filter->pflt_strlen 1501 * (and length match is checked 1502 * already) 1503 */ 1504 1505 switch (filter->cmp_type) { 1506 case FILT_CMP_STARTS: 1507 case FILT_CMP_EQUAL: 1508 if (s != value) 1509 return (!exclude); 1510 /* FALLTHROUGH */ 1511 case FILT_CMP_CONTAINS: 1512 if (s) 1513 return (exclude); 1514 else 1515 return (!exclude); 1516 break; 1517 default: 1518 /* unknown cmp_type */ 1519 break; 1520 } 1521 1522 return (-1); 1523 } 1524 1525 /* 1526 * Logs a message to the appropriate log files, users, etc. based on the 1527 * priority. Log messages are formatted according to RFC 3164 or 1528 * RFC 5424 in subsequent fprintlog_*() functions. 1529 */ 1530 static void 1531 logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1532 const char *app_name, const char *procid, const char *msgid, 1533 const char *structured_data, const char *msg, int flags) 1534 { 1535 struct timeval tv; 1536 struct logtime timestamp_now; 1537 struct filed *f; 1538 size_t savedlen; 1539 int fac, prilev; 1540 char saved[MAXSVLINE], kernel_app_name[100]; 1541 1542 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1543 pri, flags, hostname, msg); 1544 1545 (void)gettimeofday(&tv, NULL); 1546 now = tv.tv_sec; 1547 if (timestamp == NULL) { 1548 localtime_r(&now, ×tamp_now.tm); 1549 timestamp_now.usec = tv.tv_usec; 1550 timestamp = ×tamp_now; 1551 } 1552 1553 /* extract facility and priority level */ 1554 if (flags & MARK) 1555 fac = LOG_NFACILITIES; 1556 else 1557 fac = LOG_FAC(pri); 1558 1559 /* Check maximum facility number. */ 1560 if (fac > LOG_NFACILITIES) 1561 return; 1562 1563 prilev = LOG_PRI(pri); 1564 1565 /* 1566 * Lookup kernel app name from log prefix if present. 1567 * This is only used for local program specification matching. 1568 */ 1569 if (flags & ISKERNEL) { 1570 size_t kernel_app_name_length; 1571 1572 parsemsg_rfc3164_get_app_name_procid(msg, 1573 &kernel_app_name_length, NULL, NULL); 1574 if (kernel_app_name_length != 0) { 1575 strlcpy(kernel_app_name, msg, 1576 MIN(sizeof(kernel_app_name), 1577 kernel_app_name_length + 1)); 1578 } else 1579 kernel_app_name[0] = '\0'; 1580 } 1581 1582 /* log the message to the particular outputs */ 1583 if (!Initialized) { 1584 consfile.f_lasttime = *timestamp; 1585 fprintlog_first(&consfile, hostname, app_name, procid, 1586 msgid, structured_data, msg, flags); 1587 return; 1588 } 1589 1590 /* 1591 * Store all of the fields of the message, except the timestamp, 1592 * in a single string. This string is used to detect duplicate 1593 * messages. 1594 */ 1595 assert(hostname != NULL); 1596 assert(msg != NULL); 1597 savedlen = snprintf(saved, sizeof(saved), 1598 "%d %s %s %s %s %s %s", pri, hostname, 1599 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1600 msgid == NULL ? "-" : msgid, 1601 structured_data == NULL ? "-" : structured_data, msg); 1602 1603 STAILQ_FOREACH(f, &fhead, next) { 1604 /* skip messages that are incorrect priority */ 1605 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1606 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1607 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1608 ) 1609 || f->f_pmask[fac] == INTERNAL_NOPRI) 1610 continue; 1611 1612 /* skip messages with the incorrect hostname */ 1613 if (skip_message(hostname, f->f_host, 0)) 1614 continue; 1615 1616 /* skip messages with the incorrect program name */ 1617 if (flags & ISKERNEL && kernel_app_name[0] != '\0') { 1618 if (skip_message(kernel_app_name, f->f_program, 1)) 1619 continue; 1620 } else if (skip_message(app_name == NULL ? "" : app_name, 1621 f->f_program, 1)) 1622 continue; 1623 1624 /* skip messages if a property does not match filter */ 1625 if (f->f_prop_filter != NULL && 1626 f->f_prop_filter->prop_type != FILT_PROP_NOOP) { 1627 switch (f->f_prop_filter->prop_type) { 1628 case FILT_PROP_MSG: 1629 if (evaluate_prop_filter(f->f_prop_filter, 1630 msg)) 1631 continue; 1632 break; 1633 case FILT_PROP_HOSTNAME: 1634 if (evaluate_prop_filter(f->f_prop_filter, 1635 hostname)) 1636 continue; 1637 break; 1638 case FILT_PROP_PROGNAME: 1639 if (evaluate_prop_filter(f->f_prop_filter, 1640 app_name == NULL ? "" : app_name)) 1641 continue; 1642 break; 1643 default: 1644 continue; 1645 } 1646 } 1647 1648 /* skip message to console if it has already been printed */ 1649 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1650 continue; 1651 1652 /* don't output marks to recently written files */ 1653 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1654 continue; 1655 1656 /* 1657 * suppress duplicate lines to this file 1658 */ 1659 if (no_compress - (f->f_type != F_PIPE) < 1 && 1660 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1661 strcmp(saved, f->f_prevline) == 0) { 1662 f->f_lasttime = *timestamp; 1663 f->f_prevcount++; 1664 dprintf("msg repeated %d times, %ld sec of %d\n", 1665 f->f_prevcount, (long)(now - f->f_time), 1666 repeatinterval[f->f_repeatcount]); 1667 /* 1668 * If domark would have logged this by now, 1669 * flush it now (so we don't hold isolated messages), 1670 * but back off so we'll flush less often 1671 * in the future. 1672 */ 1673 if (now > REPEATTIME(f)) { 1674 fprintlog_successive(f, flags); 1675 BACKOFF(f); 1676 } 1677 } else { 1678 /* new line, save it */ 1679 if (f->f_prevcount) 1680 fprintlog_successive(f, 0); 1681 f->f_repeatcount = 0; 1682 f->f_prevpri = pri; 1683 f->f_lasttime = *timestamp; 1684 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1685 "Space to store saved line incorrect"); 1686 (void)strcpy(f->f_prevline, saved); 1687 f->f_prevlen = savedlen; 1688 fprintlog_first(f, hostname, app_name, procid, msgid, 1689 structured_data, msg, flags); 1690 } 1691 } 1692 } 1693 1694 static void 1695 dofsync(void) 1696 { 1697 struct filed *f; 1698 1699 STAILQ_FOREACH(f, &fhead, next) { 1700 if (f->f_type == F_FILE && 1701 (f->f_flags & FFLAG_NEEDSYNC) != 0) { 1702 f->f_flags &= ~FFLAG_NEEDSYNC; 1703 (void)fsync(f->f_file); 1704 } 1705 } 1706 needdofsync = false; 1707 } 1708 1709 static void 1710 iovlist_init(struct iovlist *il) 1711 { 1712 1713 il->iovcnt = 0; 1714 il->totalsize = 0; 1715 } 1716 1717 static void 1718 iovlist_append(struct iovlist *il, const char *str) 1719 { 1720 size_t size; 1721 1722 /* Discard components if we've run out of iovecs. */ 1723 if (il->iovcnt < nitems(il->iov)) { 1724 size = strlen(str); 1725 il->iov[il->iovcnt++] = (struct iovec){ 1726 .iov_base = __DECONST(char *, str), 1727 .iov_len = size, 1728 }; 1729 il->totalsize += size; 1730 } 1731 } 1732 1733 #if defined(INET) || defined(INET6) 1734 static void 1735 iovlist_truncate(struct iovlist *il, size_t size) 1736 { 1737 struct iovec *last; 1738 size_t diff; 1739 1740 while (il->totalsize > size) { 1741 diff = il->totalsize - size; 1742 last = &il->iov[il->iovcnt - 1]; 1743 if (diff >= last->iov_len) { 1744 /* Remove the last iovec entirely. */ 1745 --il->iovcnt; 1746 il->totalsize -= last->iov_len; 1747 } else { 1748 /* Remove the last iovec partially. */ 1749 last->iov_len -= diff; 1750 il->totalsize -= diff; 1751 } 1752 } 1753 } 1754 #endif 1755 1756 static void 1757 fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1758 { 1759 const char *msgret; 1760 1761 switch (f->f_type) { 1762 case F_FORW: { 1763 ssize_t lsent; 1764 1765 if (Debug) { 1766 int domain, sockfd = f->f_addr_fds[0]; 1767 socklen_t len = sizeof(domain); 1768 1769 if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN, 1770 &domain, &len) < 0) 1771 err(1, "getsockopt"); 1772 1773 printf(" %s", f->f_hname); 1774 switch (domain) { 1775 #ifdef INET 1776 case AF_INET: { 1777 struct sockaddr_in sin; 1778 1779 len = sizeof(sin); 1780 if (getpeername(sockfd, 1781 (struct sockaddr *)&sin, &len) < 0) 1782 err(1, "getpeername"); 1783 printf(":%d\n", ntohs(sin.sin_port)); 1784 break; 1785 } 1786 #endif 1787 #ifdef INET6 1788 case AF_INET6: { 1789 struct sockaddr_in6 sin6; 1790 1791 len = sizeof(sin6); 1792 if (getpeername(sockfd, 1793 (struct sockaddr *)&sin6, &len) < 0) 1794 err(1, "getpeername"); 1795 printf(":%d\n", ntohs(sin6.sin6_port)); 1796 break; 1797 } 1798 #endif 1799 default: 1800 printf("\n"); 1801 } 1802 } 1803 1804 #if defined(INET) || defined(INET6) 1805 /* Truncate messages to maximum forward length. */ 1806 iovlist_truncate(il, MaxForwardLen); 1807 #endif 1808 1809 lsent = 0; 1810 for (size_t i = 0; i < f->f_num_addr_fds; ++i) { 1811 struct msghdr msg = { 1812 .msg_iov = il->iov, 1813 .msg_iovlen = il->iovcnt, 1814 }; 1815 1816 lsent = sendmsg(f->f_addr_fds[i], &msg, 0); 1817 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1818 break; 1819 } 1820 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1821 if (lsent != (ssize_t)il->totalsize) { 1822 int e = errno; 1823 logerror("sendto"); 1824 errno = e; 1825 switch (errno) { 1826 case ENOBUFS: 1827 case ENETDOWN: 1828 case ENETUNREACH: 1829 case EHOSTUNREACH: 1830 case EHOSTDOWN: 1831 case EADDRNOTAVAIL: 1832 case EAGAIN: 1833 case ECONNREFUSED: 1834 break; 1835 /* case EBADF: */ 1836 /* case EACCES: */ 1837 /* case ENOTSOCK: */ 1838 /* case EFAULT: */ 1839 /* case EMSGSIZE: */ 1840 default: 1841 dprintf("removing entry: errno=%d\n", e); 1842 f->f_type = F_UNUSED; 1843 break; 1844 } 1845 } 1846 break; 1847 } 1848 1849 case F_FILE: 1850 dprintf(" %s\n", f->f_fname); 1851 iovlist_append(il, "\n"); 1852 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1853 /* 1854 * If writev(2) fails for potentially transient errors 1855 * like the filesystem being full, ignore it. 1856 * Otherwise remove this logfile from the list. 1857 */ 1858 if (errno != ENOSPC) { 1859 int e = errno; 1860 close_filed(f); 1861 errno = e; 1862 logerror(f->f_fname); 1863 } 1864 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1865 f->f_flags |= FFLAG_NEEDSYNC; 1866 needdofsync = true; 1867 } 1868 break; 1869 1870 case F_PIPE: 1871 dprintf(" %s\n", f->f_pname); 1872 iovlist_append(il, "\n"); 1873 if (f->f_procdesc == -1) { 1874 struct kevent ev; 1875 struct filed *f_in_list; 1876 size_t i = 0; 1877 1878 STAILQ_FOREACH(f_in_list, &fhead, next) { 1879 if (f_in_list == f) 1880 break; 1881 ++i; 1882 } 1883 f->f_file = cap_p_open(cap_syslogd, i, f->f_pname, 1884 &f->f_procdesc); 1885 if (f->f_file < 0) { 1886 logerror(f->f_pname); 1887 break; 1888 } 1889 EV_SET(&ev, f->f_procdesc, EVFILT_PROCDESC, EV_ADD, 1890 NOTE_EXIT, 0, f); 1891 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 1892 logerror("failed to add procdesc kevent"); 1893 exit(1); 1894 } 1895 } 1896 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1897 logerror(f->f_pname); 1898 f->f_dq = deadq_enter(f->f_procdesc); 1899 } 1900 break; 1901 1902 case F_CONSOLE: 1903 if (flags & IGN_CONS) { 1904 dprintf(" (ignored)\n"); 1905 break; 1906 } 1907 /* FALLTHROUGH */ 1908 1909 case F_TTY: 1910 dprintf(" %s%s\n", _PATH_DEV, f->f_fname); 1911 iovlist_append(il, "\r\n"); 1912 errno = 0; /* ttymsg() only sometimes returns an errno */ 1913 if ((msgret = cap_ttymsg(cap_syslogd, il->iov, il->iovcnt, 1914 f->f_fname, 10))) { 1915 f->f_type = F_UNUSED; 1916 logerror(msgret); 1917 } 1918 break; 1919 1920 case F_USERS: 1921 case F_WALL: 1922 dprintf("\n"); 1923 iovlist_append(il, "\r\n"); 1924 cap_wallmsg(cap_syslogd, f, il->iov, il->iovcnt); 1925 break; 1926 default: 1927 break; 1928 } 1929 } 1930 1931 static void 1932 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1933 const char *procid, const char *msgid, const char *structured_data, 1934 const char *msg, int flags) 1935 { 1936 struct iovlist il; 1937 suseconds_t usec; 1938 int i; 1939 char timebuf[33], priority_number[5]; 1940 1941 iovlist_init(&il); 1942 if (f->f_type == F_WALL) 1943 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 1944 iovlist_append(&il, "<"); 1945 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 1946 iovlist_append(&il, priority_number); 1947 iovlist_append(&il, ">1 "); 1948 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 1949 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 1950 /* Add colon to the time zone offset, which %z doesn't do. */ 1951 timebuf[32] = '\0'; 1952 timebuf[31] = timebuf[30]; 1953 timebuf[30] = timebuf[29]; 1954 timebuf[29] = ':'; 1955 1956 /* Overwrite space for microseconds with actual value. */ 1957 usec = f->f_lasttime.usec; 1958 for (i = 25; i >= 20; --i) { 1959 timebuf[i] = usec % 10 + '0'; 1960 usec /= 10; 1961 } 1962 iovlist_append(&il, timebuf); 1963 } else 1964 iovlist_append(&il, "-"); 1965 iovlist_append(&il, " "); 1966 iovlist_append(&il, hostname); 1967 iovlist_append(&il, " "); 1968 iovlist_append(&il, app_name == NULL ? "-" : app_name); 1969 iovlist_append(&il, " "); 1970 iovlist_append(&il, procid == NULL ? "-" : procid); 1971 iovlist_append(&il, " "); 1972 iovlist_append(&il, msgid == NULL ? "-" : msgid); 1973 iovlist_append(&il, " "); 1974 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 1975 iovlist_append(&il, " "); 1976 iovlist_append(&il, msg); 1977 1978 fprintlog_write(f, &il, flags); 1979 } 1980 1981 static void 1982 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 1983 const char *procid, const char *msg, int flags) 1984 { 1985 struct iovlist il; 1986 const CODE *c; 1987 int facility, priority; 1988 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 1989 priority_number[5]; 1990 bool facility_found, priority_found; 1991 1992 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 1993 &f->f_lasttime.tm) == 0) 1994 timebuf[0] = '\0'; 1995 1996 iovlist_init(&il); 1997 switch (f->f_type) { 1998 case F_FORW: 1999 /* Message forwarded over the network. */ 2000 iovlist_append(&il, "<"); 2001 snprintf(priority_number, sizeof(priority_number), "%d", 2002 f->f_prevpri); 2003 iovlist_append(&il, priority_number); 2004 iovlist_append(&il, ">"); 2005 iovlist_append(&il, timebuf); 2006 if (output_format == FORMAT_RFC3164_STRICT) { 2007 iovlist_append(&il, " "); 2008 iovlist_append(&il, hostname); 2009 } else if (strcasecmp(hostname, LocalHostName) != 0) { 2010 iovlist_append(&il, " Forwarded from "); 2011 iovlist_append(&il, hostname); 2012 iovlist_append(&il, ":"); 2013 } 2014 iovlist_append(&il, " "); 2015 break; 2016 2017 case F_WALL: 2018 /* Message written to terminals. */ 2019 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 2020 iovlist_append(&il, hostname); 2021 iovlist_append(&il, " at "); 2022 iovlist_append(&il, timebuf); 2023 iovlist_append(&il, " ...\r\n"); 2024 break; 2025 2026 default: 2027 /* Message written to files. */ 2028 iovlist_append(&il, timebuf); 2029 iovlist_append(&il, " "); 2030 2031 if (LogFacPri) { 2032 iovlist_append(&il, "<"); 2033 2034 facility = f->f_prevpri & LOG_FACMASK; 2035 facility_found = false; 2036 if (LogFacPri > 1) { 2037 for (c = facilitynames; c->c_name; c++) { 2038 if (c->c_val == facility) { 2039 iovlist_append(&il, c->c_name); 2040 facility_found = true; 2041 break; 2042 } 2043 } 2044 } 2045 if (!facility_found) { 2046 snprintf(facility_number, 2047 sizeof(facility_number), "%d", 2048 LOG_FAC(facility)); 2049 iovlist_append(&il, facility_number); 2050 } 2051 2052 iovlist_append(&il, "."); 2053 2054 priority = LOG_PRI(f->f_prevpri); 2055 priority_found = false; 2056 if (LogFacPri > 1) { 2057 for (c = prioritynames; c->c_name; c++) { 2058 if (c->c_val == priority) { 2059 iovlist_append(&il, c->c_name); 2060 priority_found = true; 2061 break; 2062 } 2063 } 2064 } 2065 if (!priority_found) { 2066 snprintf(priority_number, 2067 sizeof(priority_number), "%d", priority); 2068 iovlist_append(&il, priority_number); 2069 } 2070 2071 iovlist_append(&il, "> "); 2072 } 2073 2074 iovlist_append(&il, hostname); 2075 iovlist_append(&il, " "); 2076 break; 2077 } 2078 2079 /* Message body with application name and process ID prefixed. */ 2080 if (app_name != NULL) { 2081 iovlist_append(&il, app_name); 2082 if (procid != NULL) { 2083 iovlist_append(&il, "["); 2084 iovlist_append(&il, procid); 2085 iovlist_append(&il, "]"); 2086 } 2087 iovlist_append(&il, ": "); 2088 } 2089 iovlist_append(&il, msg); 2090 2091 fprintlog_write(f, &il, flags); 2092 } 2093 2094 static void 2095 fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2096 const char *procid, const char *msgid __unused, 2097 const char *structured_data __unused, const char *msg, int flags) 2098 { 2099 2100 dprintf("Logging to %s", TypeNames[f->f_type]); 2101 f->f_time = now; 2102 f->f_prevcount = 0; 2103 if (f->f_type == F_UNUSED) { 2104 dprintf("\n"); 2105 return; 2106 } 2107 2108 if (IS_RFC3164_FORMAT) 2109 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2110 else 2111 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2112 structured_data, msg, flags); 2113 } 2114 2115 /* 2116 * Prints a message to a log file that the previously logged message was 2117 * received multiple times. 2118 */ 2119 static void 2120 fprintlog_successive(struct filed *f, int flags) 2121 { 2122 char msg[100]; 2123 2124 assert(f->f_prevcount > 0); 2125 snprintf(msg, sizeof(msg), "last message repeated %d times", 2126 f->f_prevcount); 2127 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2128 flags); 2129 } 2130 2131 /* 2132 * WALLMSG -- Write a message to the world at large 2133 * 2134 * Write the specified message to either the entire 2135 * world, or a list of approved users. 2136 * 2137 * Note: This function is wrapped by cap_wallmsg() when Capsicum support is 2138 * enabled so ttymsg() can be called. 2139 */ 2140 void 2141 wallmsg(const struct filed *f, struct iovec *iov, const int iovlen) 2142 { 2143 static int reenter; /* avoid calling ourselves */ 2144 struct utmpx *ut; 2145 int i; 2146 const char *p; 2147 2148 if (reenter++) 2149 return; 2150 setutxent(); 2151 /* NOSTRICT */ 2152 while ((ut = getutxent()) != NULL) { 2153 if (ut->ut_type != USER_PROCESS) 2154 continue; 2155 if (f->f_type == F_WALL) { 2156 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2157 TTYMSGTIME)) != NULL) 2158 dprintf("%s\n", p); 2159 continue; 2160 } 2161 /* should we send the message to this user? */ 2162 for (i = 0; i < MAXUNAMES; i++) { 2163 if (!f->f_uname[i][0]) 2164 break; 2165 if (!strcmp(f->f_uname[i], ut->ut_user)) { 2166 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2167 TTYMSGTIME)) != NULL) 2168 dprintf("%s\n", p); 2169 break; 2170 } 2171 } 2172 } 2173 endutxent(); 2174 reenter = 0; 2175 } 2176 2177 /* 2178 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2179 */ 2180 static const char * 2181 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2182 { 2183 static char device[1024]; 2184 static char errbuf[1024]; 2185 struct stat sb; 2186 2187 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2188 2189 if (stat(device, &sb) < 0) { 2190 (void) snprintf(errbuf, sizeof(errbuf), 2191 "%s: %s", device, strerror(errno)); 2192 return (errbuf); 2193 } 2194 if ((sb.st_mode & S_IWGRP) == 0) 2195 /* Messages disabled. */ 2196 return (NULL); 2197 return (ttymsg(iov, iovcnt, line, tmout)); 2198 } 2199 2200 /* 2201 * Return a printable representation of a host address. 2202 */ 2203 static const char * 2204 cvthname(struct sockaddr *f) 2205 { 2206 int error, hl; 2207 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2208 2209 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2210 error = cap_getnameinfo(cap_net, f, f->sa_len, ip, sizeof(ip), NULL, 0, 2211 NI_NUMERICHOST); 2212 if (error) { 2213 dprintf("Malformed from address %s\n", gai_strerror(error)); 2214 return ("???"); 2215 } 2216 dprintf("cvthname(%s)\n", ip); 2217 2218 if (!resolve) 2219 return (ip); 2220 2221 error = cap_getnameinfo(cap_net, f, f->sa_len, hname, sizeof(hname), 2222 NULL, 0, NI_NAMEREQD); 2223 if (error) { 2224 dprintf("Host name for your address (%s) unknown\n", ip); 2225 return (ip); 2226 } 2227 hl = strlen(hname); 2228 if (hl > 0 && hname[hl-1] == '.') 2229 hname[--hl] = '\0'; 2230 /* RFC 5424 prefers logging FQDNs. */ 2231 if (IS_RFC3164_FORMAT) 2232 trimdomain(hname, hl); 2233 return (hname); 2234 } 2235 2236 /* 2237 * Print syslogd errors some place. 2238 */ 2239 void 2240 logerror(const char *msg) 2241 { 2242 char buf[512]; 2243 static int recursed = 0; 2244 2245 /* If there's an error while trying to log an error, give up. */ 2246 if (recursed) 2247 return; 2248 recursed++; 2249 if (errno != 0) { 2250 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2251 strerror(errno)); 2252 msg = buf; 2253 } 2254 errno = 0; 2255 dprintf("%s\n", msg); 2256 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2257 NULL, msg, 0); 2258 recursed--; 2259 } 2260 2261 static void 2262 die(int signo) 2263 { 2264 struct filed *f; 2265 struct socklist *sl; 2266 char buf[100]; 2267 2268 STAILQ_FOREACH(f, &fhead, next) { 2269 /* flush any pending output */ 2270 if (f->f_prevcount) 2271 fprintlog_successive(f, 0); 2272 } 2273 if (signo) { 2274 dprintf("syslogd: exiting on signal %d\n", signo); 2275 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2276 errno = 0; 2277 logerror(buf); 2278 } 2279 STAILQ_FOREACH(sl, &shead, next) { 2280 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) { 2281 if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) { 2282 dprintf("Failed to unlink %s: %s", sl->sl_name, 2283 strerror(errno)); 2284 } 2285 } 2286 } 2287 pidfile_remove(pfh); 2288 2289 exit(1); 2290 } 2291 2292 static int 2293 configfiles(const struct dirent *dp) 2294 { 2295 const char *p; 2296 size_t ext_len; 2297 2298 if (dp->d_name[0] == '.') 2299 return (0); 2300 2301 ext_len = sizeof(include_ext) -1; 2302 2303 if (dp->d_namlen <= ext_len) 2304 return (0); 2305 2306 p = &dp->d_name[dp->d_namlen - ext_len]; 2307 if (strcmp(p, include_ext) != 0) 2308 return (0); 2309 2310 return (1); 2311 } 2312 2313 static nvlist_t * 2314 parseconfigfile(FILE *cf, bool allow_includes, nvlist_t *nvl_conf) 2315 { 2316 FILE *cf2; 2317 struct dirent **ent; 2318 char cline[LINE_MAX]; 2319 char host[MAXHOSTNAMELEN]; 2320 char prog[LINE_MAX]; 2321 char file[MAXPATHLEN]; 2322 char pfilter[LINE_MAX]; 2323 char *p, *tmp; 2324 int i, nents; 2325 size_t include_len; 2326 2327 /* 2328 * Foreach line in the conf table, open that file. 2329 */ 2330 include_len = sizeof(include_str) - 1; 2331 (void)strlcpy(host, "*", sizeof(host)); 2332 (void)strlcpy(prog, "*", sizeof(prog)); 2333 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2334 while (fgets(cline, sizeof(cline), cf) != NULL) { 2335 /* 2336 * check for end-of-section, comments, strip off trailing 2337 * spaces and newline character. #!prog is treated specially: 2338 * following lines apply only to that program. 2339 */ 2340 for (p = cline; isspace(*p); ++p) 2341 continue; 2342 if (*p == '\0') 2343 continue; 2344 if (allow_includes && 2345 strncmp(p, include_str, include_len) == 0 && 2346 isspace(p[include_len])) { 2347 p += include_len; 2348 while (isspace(*p)) 2349 p++; 2350 tmp = p; 2351 while (*tmp != '\0' && !isspace(*tmp)) 2352 tmp++; 2353 *tmp = '\0'; 2354 dprintf("Trying to include files in '%s'\n", p); 2355 nents = scandir(p, &ent, configfiles, alphasort); 2356 if (nents == -1) { 2357 dprintf("Unable to open '%s': %s\n", p, 2358 strerror(errno)); 2359 continue; 2360 } 2361 for (i = 0; i < nents; i++) { 2362 if (snprintf(file, sizeof(file), "%s/%s", p, 2363 ent[i]->d_name) >= (int)sizeof(file)) { 2364 dprintf("ignoring path too long: " 2365 "'%s/%s'\n", p, ent[i]->d_name); 2366 free(ent[i]); 2367 continue; 2368 } 2369 free(ent[i]); 2370 cf2 = fopen(file, "r"); 2371 if (cf2 == NULL) 2372 continue; 2373 dprintf("reading %s\n", file); 2374 parseconfigfile(cf2, false, nvl_conf); 2375 fclose(cf2); 2376 } 2377 free(ent); 2378 continue; 2379 } 2380 if (*p == '#') { 2381 p++; 2382 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2383 continue; 2384 } 2385 if (*p == '+' || *p == '-') { 2386 host[0] = *p++; 2387 while (isspace(*p)) 2388 p++; 2389 if (*p == '\0' || *p == '*') { 2390 (void)strlcpy(host, "*", sizeof(host)); 2391 continue; 2392 } 2393 if (*p == '@') 2394 p = LocalHostName; 2395 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2396 if (!isalnum(*p) && *p != '.' && *p != '-' 2397 && *p != ',' && *p != ':' && *p != '%') 2398 break; 2399 host[i] = *p++; 2400 } 2401 host[i] = '\0'; 2402 continue; 2403 } 2404 if (*p == '!') { 2405 p++; 2406 while (isspace(*p)) 2407 p++; 2408 if (*p == '\0' || *p == '*') { 2409 (void)strlcpy(prog, "*", sizeof(prog)); 2410 continue; 2411 } 2412 for (i = 0; i < LINE_MAX - 1; i++) { 2413 if (!isprint(p[i]) || isspace(p[i])) 2414 break; 2415 prog[i] = p[i]; 2416 } 2417 prog[i] = '\0'; 2418 continue; 2419 } 2420 if (*p == ':') { 2421 p++; 2422 while (isspace(*p)) 2423 p++; 2424 if (*p == '\0' || *p == '*') { 2425 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2426 continue; 2427 } 2428 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2429 continue; 2430 } 2431 for (p = cline + 1; *p != '\0'; p++) { 2432 if (*p != '#') 2433 continue; 2434 if (*(p - 1) == '\\') { 2435 strcpy(p - 1, p); 2436 p--; 2437 continue; 2438 } 2439 *p = '\0'; 2440 break; 2441 } 2442 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2443 cline[i] = '\0'; 2444 cfline(nvl_conf, cline, prog, host, pfilter); 2445 2446 } 2447 return (nvl_conf); 2448 } 2449 2450 /* 2451 * Read configuration file and create filed entries for each line. 2452 * 2453 * Note: This function is wrapped by cap_readconfigfile() when Capsicum 2454 * support is enabled so resources can be acquired outside of the security 2455 * sandbox. 2456 */ 2457 nvlist_t * 2458 readconfigfile(const char *path) 2459 { 2460 FILE *cf; 2461 nvlist_t *nvl_conf = nvlist_create(0); 2462 2463 if ((cf = fopen(path, "r")) != NULL) { 2464 nvl_conf = parseconfigfile(cf, true, nvl_conf); 2465 (void)fclose(cf); 2466 } else { 2467 dprintf("cannot open %s\n", path); 2468 cfline(nvl_conf, "*.ERR\t/dev/console", "*", "*", "*"); 2469 cfline(nvl_conf, "*.PANIC\t*", "*", "*", "*"); 2470 } 2471 return (nvl_conf); 2472 } 2473 2474 static void 2475 fill_flist(nvlist_t *nvl_conf) 2476 { 2477 const nvlist_t * const *filed_list; 2478 size_t nfileds; 2479 2480 if (!nvlist_exists_nvlist_array(nvl_conf, "filed_list")) 2481 return; 2482 filed_list = nvlist_get_nvlist_array(nvl_conf, "filed_list", 2483 &nfileds); 2484 for (size_t i = 0; i < nfileds; ++i) { 2485 struct filed *f; 2486 2487 f = nvlist_to_filed(filed_list[i]); 2488 STAILQ_INSERT_TAIL(&fhead, f, next); 2489 } 2490 nvlist_destroy(nvl_conf); 2491 } 2492 2493 /* 2494 * Close all open log files. 2495 */ 2496 void 2497 closelogfiles(void) 2498 { 2499 struct filed *f; 2500 2501 while (!STAILQ_EMPTY(&fhead)) { 2502 f = STAILQ_FIRST(&fhead); 2503 STAILQ_REMOVE_HEAD(&fhead, next); 2504 2505 /* flush any pending output */ 2506 if (f->f_prevcount) 2507 fprintlog_successive(f, 0); 2508 2509 switch (f->f_type) { 2510 case F_FILE: 2511 case F_FORW: 2512 case F_CONSOLE: 2513 case F_TTY: 2514 case F_PIPE: 2515 close_filed(f); 2516 break; 2517 default: 2518 break; 2519 } 2520 2521 if (f->f_prop_filter) { 2522 switch (f->f_prop_filter->cmp_type) { 2523 case FILT_CMP_REGEX: 2524 regfree(f->f_prop_filter->pflt_re); 2525 free(f->f_prop_filter->pflt_re); 2526 /* FALLTHROUGH */ 2527 case FILT_CMP_CONTAINS: 2528 case FILT_CMP_EQUAL: 2529 case FILT_CMP_STARTS: 2530 free(f->f_prop_filter->pflt_strval); 2531 break; 2532 } 2533 free(f->f_prop_filter); 2534 } 2535 2536 /* 2537 * If a piped process is running, then defer the filed 2538 * cleanup until it exits. 2539 */ 2540 if (f->f_type != F_PIPE || f->f_procdesc == -1) 2541 free(f); 2542 } 2543 } 2544 2545 static void 2546 syslogd_cap_enter(void) 2547 { 2548 #ifdef WITH_CASPER 2549 cap_channel_t *cap_casper; 2550 cap_net_limit_t *limit; 2551 2552 cap_casper = cap_init(); 2553 if (cap_casper == NULL) 2554 err(1, "Failed to communicate with libcasper"); 2555 cap_syslogd = cap_service_open(cap_casper, "syslogd.casper"); 2556 if (cap_syslogd == NULL) 2557 err(1, "Failed to open the syslogd.casper libcasper service"); 2558 cap_net = cap_service_open(cap_casper, "system.net"); 2559 if (cap_net == NULL) 2560 err(1, "Failed to open the system.net libcasper service"); 2561 cap_close(cap_casper); 2562 limit = cap_net_limit_init(cap_net, 2563 CAPNET_ADDR2NAME | CAPNET_NAME2ADDR); 2564 if (limit == NULL) 2565 err(1, "Failed to create system.net limits"); 2566 if (cap_net_limit(limit) == -1) 2567 err(1, "Failed to apply system.net limits"); 2568 caph_cache_tzdata(); 2569 caph_cache_catpages(); 2570 if (caph_enter_casper() == -1) 2571 err(1, "Failed to enter capability mode"); 2572 #endif 2573 } 2574 2575 /* 2576 * INIT -- Initialize syslogd from configuration table 2577 */ 2578 static void 2579 init(bool reload) 2580 { 2581 int i; 2582 char *p; 2583 char oldLocalHostName[MAXHOSTNAMELEN]; 2584 char hostMsg[2*MAXHOSTNAMELEN+40]; 2585 char bootfileMsg[MAXLINE + 1]; 2586 2587 dprintf("init\n"); 2588 2589 /* 2590 * Load hostname (may have changed). 2591 */ 2592 if (reload) 2593 (void)strlcpy(oldLocalHostName, LocalHostName, 2594 sizeof(oldLocalHostName)); 2595 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2596 err(EX_OSERR, "gethostname() failed"); 2597 if ((p = strchr(LocalHostName, '.')) != NULL) { 2598 /* RFC 5424 prefers logging FQDNs. */ 2599 if (IS_RFC3164_FORMAT) 2600 *p = '\0'; 2601 LocalDomain = p + 1; 2602 } else { 2603 LocalDomain = ""; 2604 } 2605 2606 #ifndef WITH_CASPER 2607 /* 2608 * XXX: Disable when running in capability mode, for now. 2609 * This requires a new interface in the tzcode module to 2610 * get running without capability violations. 2611 * 2612 * Load / reload timezone data (in case it changed). 2613 * 2614 * Just calling tzset() again does not work, the timezone code 2615 * caches the result. However, by setting the TZ variable, one 2616 * can defeat the caching and have the timezone code really 2617 * reload the timezone data. Respect any initial setting of 2618 * TZ, in case the system is configured specially. 2619 */ 2620 dprintf("loading timezone data via tzset()\n"); 2621 if (getenv("TZ")) { 2622 tzset(); 2623 } else { 2624 setenv("TZ", ":/etc/localtime", 1); 2625 tzset(); 2626 unsetenv("TZ"); 2627 } 2628 #endif 2629 2630 if (!reload) { 2631 struct tm tm; 2632 /* Cache time files before entering capability mode. */ 2633 timegm(&tm); 2634 syslogd_cap_enter(); 2635 } 2636 2637 Initialized = false; 2638 closelogfiles(); 2639 fill_flist(cap_readconfigfile(cap_syslogd, ConfFile)); 2640 Initialized = true; 2641 2642 if (Debug) { 2643 struct filed *f; 2644 int port; 2645 2646 STAILQ_FOREACH(f, &fhead, next) { 2647 for (i = 0; i <= LOG_NFACILITIES; i++) 2648 if (f->f_pmask[i] == INTERNAL_NOPRI) 2649 printf("X "); 2650 else 2651 printf("%d ", f->f_pmask[i]); 2652 printf("%s: ", TypeNames[f->f_type]); 2653 switch (f->f_type) { 2654 case F_FILE: 2655 printf("%s", f->f_fname); 2656 break; 2657 2658 case F_CONSOLE: 2659 case F_TTY: 2660 printf("%s%s", _PATH_DEV, f->f_fname); 2661 break; 2662 2663 case F_FORW: { 2664 int domain, sockfd = f->f_addr_fds[0]; 2665 socklen_t len = sizeof(domain); 2666 2667 if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN, 2668 &domain, &len) < 0) 2669 err(1, "getsockopt"); 2670 2671 switch (domain) { 2672 #ifdef INET 2673 case AF_INET: { 2674 struct sockaddr_in sin; 2675 2676 len = sizeof(sin); 2677 if (getpeername(sockfd, (struct sockaddr *)&sin, &len) < 0) 2678 err(1, "getpeername"); 2679 port = ntohs(sin.sin_port); 2680 break; 2681 } 2682 #endif 2683 #ifdef INET6 2684 case AF_INET6: { 2685 struct sockaddr_in6 sin6; 2686 2687 len = sizeof(sin6); 2688 if (getpeername(sockfd, (struct sockaddr *)&sin6, &len) < 0) 2689 err(1, "getpeername"); 2690 port = ntohs(sin6.sin6_port); 2691 break; 2692 } 2693 #endif 2694 default: 2695 port = 0; 2696 } 2697 if (port != 514) { 2698 printf("%s:%d", f->f_hname, port); 2699 } else { 2700 printf("%s", f->f_hname); 2701 } 2702 break; 2703 } 2704 2705 case F_PIPE: 2706 printf("%s", f->f_pname); 2707 break; 2708 2709 case F_USERS: 2710 for (i = 0; i < MAXUNAMES && *f->f_uname[i]; i++) 2711 printf("%s, ", f->f_uname[i]); 2712 break; 2713 default: 2714 break; 2715 } 2716 if (*f->f_program != '\0') 2717 printf(" (%s)", f->f_program); 2718 printf("\n"); 2719 } 2720 } 2721 2722 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2723 NULL, NULL, "restart", 0); 2724 dprintf("syslogd: restarted\n"); 2725 /* 2726 * Log a change in hostname, but only on reload. 2727 */ 2728 if (reload && strcmp(oldLocalHostName, LocalHostName) != 0) { 2729 (void)snprintf(hostMsg, sizeof(hostMsg), 2730 "hostname changed, \"%s\" to \"%s\"", 2731 oldLocalHostName, LocalHostName); 2732 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2733 NULL, NULL, NULL, hostMsg, 0); 2734 dprintf("%s\n", hostMsg); 2735 } 2736 /* 2737 * Log the kernel boot file if we aren't going to use it as 2738 * the prefix, and if this is *not* a reload. 2739 */ 2740 if (!reload && !use_bootfile) { 2741 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2742 "kernel boot file is %s", bootfile); 2743 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2744 NULL, NULL, NULL, bootfileMsg, 0); 2745 dprintf("%s\n", bootfileMsg); 2746 } 2747 } 2748 2749 /* 2750 * Compile property-based filter. 2751 */ 2752 static nvlist_t * 2753 prop_filter_compile(const char *cfilter) 2754 { 2755 nvlist_t *nvl_pfilter; 2756 struct prop_filter pfilter = { }; 2757 char *filter, *filter_endpos, *filter_begpos, *p; 2758 char **ap, *argv[2] = {NULL, NULL}; 2759 int escaped; 2760 2761 filter = strdup(cfilter); 2762 if (filter == NULL) 2763 err(1, "strdup"); 2764 filter_begpos = filter; 2765 2766 /* 2767 * Here's some filter examples mentioned in syslog.conf(5) 2768 * 'msg, contains, ".*Deny.*"' 2769 * 'programname, regex, "^bird6?$"' 2770 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2771 */ 2772 2773 /* 2774 * Split filter into 3 parts: property name (argv[0]), 2775 * cmp type (argv[1]) and lvalue for comparison (filter). 2776 */ 2777 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2778 if (**ap != '\0') 2779 if (++ap >= &argv[2]) 2780 break; 2781 } 2782 2783 if (argv[0] == NULL || argv[1] == NULL) { 2784 dprintf("filter parse error"); 2785 goto error; 2786 } 2787 2788 /* fill in prop_type */ 2789 if (strcasecmp(argv[0], "msg") == 0) 2790 pfilter.prop_type = FILT_PROP_MSG; 2791 else if (strcasecmp(argv[0], "hostname") == 0) 2792 pfilter.prop_type = FILT_PROP_HOSTNAME; 2793 else if (strcasecmp(argv[0], "source") == 0) 2794 pfilter.prop_type = FILT_PROP_HOSTNAME; 2795 else if (strcasecmp(argv[0], "programname") == 0) 2796 pfilter.prop_type = FILT_PROP_PROGNAME; 2797 else { 2798 dprintf("unknown property"); 2799 goto error; 2800 } 2801 2802 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2803 if (*argv[1] == '!') { 2804 pfilter.cmp_flags |= FILT_FLAG_EXCLUDE; 2805 argv[1]++; 2806 } 2807 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2808 pfilter.cmp_flags |= FILT_FLAG_ICASE; 2809 argv[1] += sizeof("icase_") - 1; 2810 } 2811 2812 /* fill in cmp_type */ 2813 if (strcasecmp(argv[1], "contains") == 0) 2814 pfilter.cmp_type = FILT_CMP_CONTAINS; 2815 else if (strcasecmp(argv[1], "isequal") == 0) 2816 pfilter.cmp_type = FILT_CMP_EQUAL; 2817 else if (strcasecmp(argv[1], "startswith") == 0) 2818 pfilter.cmp_type = FILT_CMP_STARTS; 2819 else if (strcasecmp(argv[1], "regex") == 0) 2820 pfilter.cmp_type = FILT_CMP_REGEX; 2821 else if (strcasecmp(argv[1], "ereregex") == 0) { 2822 pfilter.cmp_type = FILT_CMP_REGEX; 2823 pfilter.cmp_flags |= FILT_FLAG_EXTENDED; 2824 } else { 2825 dprintf("unknown cmp function"); 2826 goto error; 2827 } 2828 2829 /* 2830 * Handle filter value 2831 */ 2832 2833 /* ' ".*Deny.*"' */ 2834 /* remove leading whitespace and check for '"' next character */ 2835 filter += strspn(filter, ", \t\n"); 2836 if (*filter != '"' || strlen(filter) < 3) { 2837 dprintf("property value parse error"); 2838 goto error; 2839 } 2840 filter++; 2841 2842 /* '.*Deny.*"' */ 2843 /* process possible backslash (\") escaping */ 2844 escaped = 0; 2845 filter_endpos = filter; 2846 for (p = filter; *p != '\0'; p++) { 2847 if (*p == '\\' && !escaped) { 2848 escaped = 1; 2849 /* do not shift filter_endpos */ 2850 continue; 2851 } 2852 if (*p == '"' && !escaped) { 2853 p++; 2854 break; 2855 } 2856 /* we've seen some esc symbols, need to compress the line */ 2857 if (filter_endpos != p) 2858 *filter_endpos = *p; 2859 2860 filter_endpos++; 2861 escaped = 0; 2862 } 2863 2864 *filter_endpos = '\0'; 2865 /* '.*Deny.*' */ 2866 2867 /* We should not have anything but whitespace left after closing '"' */ 2868 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2869 dprintf("property value parse error"); 2870 goto error; 2871 } 2872 2873 pfilter.pflt_strval = filter; 2874 /* An nvlist is heap allocated heap here. */ 2875 nvl_pfilter = prop_filter_to_nvlist(&pfilter); 2876 2877 free(filter_begpos); 2878 return (nvl_pfilter); 2879 error: 2880 free(filter_begpos); 2881 return (NULL); 2882 } 2883 2884 static const char * 2885 parse_selector(const char *p, struct filed *f) 2886 { 2887 int i, pri; 2888 int pri_done = 0, pri_cmp = 0, pri_invert = 0; 2889 char *bp, buf[LINE_MAX]; 2890 const char *q; 2891 2892 /* find the end of this facility name list */ 2893 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';) 2894 continue; 2895 2896 /* get the priority comparison */ 2897 if (*q == '!') { 2898 pri_invert = 1; 2899 q++; 2900 } 2901 while (!pri_done) { 2902 switch (*q) { 2903 case '<': 2904 pri_cmp |= PRI_LT; 2905 q++; 2906 break; 2907 case '=': 2908 pri_cmp |= PRI_EQ; 2909 q++; 2910 break; 2911 case '>': 2912 pri_cmp |= PRI_GT; 2913 q++; 2914 break; 2915 default: 2916 pri_done++; 2917 break; 2918 } 2919 } 2920 2921 /* collect priority name */ 2922 for (bp = buf; *q != '\0' && !strchr("\t,; ", *q); ) 2923 *bp++ = *q++; 2924 *bp = '\0'; 2925 2926 /* skip cruft */ 2927 while (strchr(",;", *q)) 2928 q++; 2929 2930 /* decode priority name */ 2931 if (*buf == '*') { 2932 pri = LOG_PRIMASK; 2933 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2934 } else { 2935 /* Ignore trailing spaces. */ 2936 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2937 buf[i] = '\0'; 2938 2939 pri = decode(buf, prioritynames); 2940 if (pri < 0) { 2941 warnx("unknown priority name \"%s\", setting to 'info'", 2942 buf); 2943 pri = LOG_INFO; 2944 } 2945 } 2946 if (!pri_cmp) 2947 pri_cmp = UniquePriority ? PRI_EQ : (PRI_EQ | PRI_GT); 2948 if (pri_invert) 2949 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2950 2951 /* scan facilities */ 2952 while (*p != '\0' && !strchr("\t.; ", *p)) { 2953 for (bp = buf; *p != '\0' && !strchr("\t,;. ", *p); ) 2954 *bp++ = *p++; 2955 *bp = '\0'; 2956 2957 if (*buf == '*') { 2958 for (i = 0; i < LOG_NFACILITIES; i++) { 2959 f->f_pmask[i] = pri; 2960 f->f_pcmp[i] = pri_cmp; 2961 } 2962 } else { 2963 i = decode(buf, facilitynames); 2964 if (i < 0) { 2965 warnx("unknown facility name \"%s\", ignoring", 2966 buf); 2967 } else { 2968 f->f_pmask[i >> 3] = pri; 2969 f->f_pcmp[i >> 3] = pri_cmp; 2970 } 2971 } 2972 while (*p == ',' || *p == ' ') 2973 p++; 2974 } 2975 return (q); 2976 } 2977 2978 static int 2979 maybe_dup_forw_socket(const nvlist_t *nvl, const struct sockaddr *rsa, 2980 const struct sockaddr *lsa) 2981 { 2982 const nvlist_t * const *line; 2983 size_t linecount; 2984 2985 if (!nvlist_exists_nvlist_array(nvl, "filed_list")) 2986 return (-1); 2987 line = nvlist_get_nvlist_array(nvl, "filed_list", &linecount); 2988 for (size_t i = 0; i < linecount; i++) { 2989 const struct forw_addr *forw; 2990 const int *fdp; 2991 size_t fdc; 2992 2993 if (nvlist_get_number(line[i], "f_type") != F_FORW) 2994 continue; 2995 fdp = nvlist_get_descriptor_array(line[i], "f_addr_fds", &fdc); 2996 forw = nvlist_get_binary(line[i], "f_addrs", NULL); 2997 for (size_t j = 0; j < fdc; j++) { 2998 int fd; 2999 3000 if (memcmp(&forw[j].raddr, rsa, rsa->sa_len) != 0 || 3001 memcmp(&forw[j].laddr, lsa, lsa->sa_len) != 0) 3002 continue; 3003 3004 fd = dup(fdp[j]); 3005 if (fd < 0) 3006 err(1, "dup"); 3007 return (fd); 3008 } 3009 } 3010 3011 return (-1); 3012 } 3013 3014 /* 3015 * Create a UDP socket that will forward messages from "lai" to "ai". 3016 * Capsicum doesn't permit connect() or sendto(), so we can't reuse the (bound) 3017 * sockets used to listen for messages. 3018 */ 3019 static int 3020 make_forw_socket(const nvlist_t *nvl, struct addrinfo *ai, struct addrinfo *lai) 3021 { 3022 int s; 3023 3024 s = socket(ai->ai_family, ai->ai_socktype, 0); 3025 if (s < 0) 3026 err(1, "socket"); 3027 if (lai != NULL) { 3028 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 3029 sizeof(int)) < 0) 3030 err(1, "setsockopt"); 3031 if (bind(s, lai->ai_addr, lai->ai_addrlen) < 0) 3032 err(1, "bind"); 3033 } 3034 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 3035 if (errno == EADDRINUSE && lai != NULL) { 3036 int s1; 3037 3038 s1 = maybe_dup_forw_socket(nvl, ai->ai_addr, 3039 lai->ai_addr); 3040 if (s1 < 0) 3041 errc(1, EADDRINUSE, "connect"); 3042 (void)close(s); 3043 s = s1; 3044 } else { 3045 err(1, "connect"); 3046 } 3047 } 3048 /* Make it a write-only socket. */ 3049 if (shutdown(s, SHUT_RD) < 0) 3050 err(1, "shutdown"); 3051 3052 return (s); 3053 } 3054 3055 static void 3056 make_forw_socket_array(const nvlist_t *nvl, struct filed *f, 3057 struct addrinfo *res) 3058 { 3059 struct addrinfo *ai; 3060 size_t i; 3061 3062 f->f_num_addr_fds = 0; 3063 3064 /* How many sockets do we need? */ 3065 for (ai = res; ai != NULL; ai = ai->ai_next) { 3066 struct socklist *boundsock; 3067 int count; 3068 3069 count = 0; 3070 STAILQ_FOREACH(boundsock, &shead, next) { 3071 if (boundsock->sl_ai.ai_family == ai->ai_family) 3072 count++; 3073 } 3074 if (count == 0) 3075 count = 1; 3076 f->f_num_addr_fds += count; 3077 } 3078 3079 f->f_addr_fds = calloc(f->f_num_addr_fds, sizeof(*f->f_addr_fds)); 3080 f->f_addrs = calloc(f->f_num_addr_fds, sizeof(*f->f_addrs)); 3081 if (f->f_addr_fds == NULL || f->f_addrs == NULL) 3082 err(1, "malloc failed"); 3083 3084 /* 3085 * Create our forwarding sockets: for each bound socket 3086 * belonging to the destination address, create one socket 3087 * connected to the destination and bound to the address of the 3088 * listening socket. 3089 */ 3090 i = 0; 3091 for (ai = res; ai != NULL; ai = ai->ai_next) { 3092 struct socklist *boundsock; 3093 int count; 3094 3095 count = 0; 3096 STAILQ_FOREACH(boundsock, &shead, next) { 3097 if (boundsock->sl_ai.ai_family == 3098 ai->ai_family) { 3099 memcpy(&f->f_addrs[i].raddr, ai->ai_addr, 3100 ai->ai_addrlen); 3101 memcpy(&f->f_addrs[i].laddr, 3102 boundsock->sl_ai.ai_addr, 3103 boundsock->sl_ai.ai_addrlen); 3104 f->f_addr_fds[i++] = make_forw_socket(nvl, ai, 3105 &boundsock->sl_ai); 3106 count++; 3107 } 3108 } 3109 if (count == 0) { 3110 memcpy(&f->f_addrs[i].raddr, ai->ai_addr, 3111 ai->ai_addrlen); 3112 f->f_addr_fds[i++] = make_forw_socket(nvl, ai, NULL); 3113 } 3114 } 3115 assert(i == f->f_num_addr_fds); 3116 } 3117 3118 static void 3119 parse_action(const nvlist_t *nvl, const char *p, struct filed *f) 3120 { 3121 struct addrinfo hints, *res; 3122 size_t i; 3123 int error; 3124 const char *q; 3125 bool syncfile; 3126 3127 if (*p == '-') { 3128 syncfile = false; 3129 p++; 3130 } else 3131 syncfile = true; 3132 3133 f->f_file = -1; 3134 switch (*p) { 3135 case '@': 3136 { 3137 char *tp; 3138 char endkey = ':'; 3139 /* 3140 * scan forward to see if there is a port defined. 3141 * so we can't use strlcpy.. 3142 */ 3143 i = sizeof(f->f_hname); 3144 tp = f->f_hname; 3145 p++; 3146 3147 /* 3148 * an ipv6 address should start with a '[' in that case 3149 * we should scan for a ']' 3150 */ 3151 if (*p == '[') { 3152 p++; 3153 endkey = ']'; 3154 } 3155 while (*p && (*p != endkey) && (i-- > 0)) { 3156 *tp++ = *p++; 3157 } 3158 if (endkey == ']' && *p == endkey) 3159 p++; 3160 *tp = '\0'; 3161 } 3162 /* See if we copied a domain and have a port */ 3163 if (*p == ':') 3164 p++; 3165 else 3166 p = NULL; 3167 3168 hints = (struct addrinfo){ 3169 .ai_family = family, 3170 .ai_socktype = SOCK_DGRAM 3171 }; 3172 error = getaddrinfo(f->f_hname, p ? p : "syslog", &hints, &res); 3173 if (error) { 3174 dprintf("%s\n", gai_strerror(error)); 3175 break; 3176 } 3177 make_forw_socket_array(nvl, f, res); 3178 freeaddrinfo(res); 3179 f->f_type = F_FORW; 3180 break; 3181 3182 case '/': 3183 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3184 f->f_type = F_UNUSED; 3185 dprintf("%s\n", p); 3186 break; 3187 } 3188 if (syncfile) 3189 f->f_flags |= FFLAG_SYNC; 3190 if (isatty(f->f_file)) { 3191 if (strcmp(p, _PATH_CONSOLE) == 0) 3192 f->f_type = F_CONSOLE; 3193 else 3194 f->f_type = F_TTY; 3195 (void)strlcpy(f->f_fname, p + sizeof(_PATH_DEV) - 1, 3196 sizeof(f->f_fname)); 3197 } else { 3198 (void)strlcpy(f->f_fname, p, sizeof(f->f_fname)); 3199 f->f_type = F_FILE; 3200 } 3201 break; 3202 3203 case '|': 3204 f->f_procdesc = -1; 3205 (void)strlcpy(f->f_pname, p + 1, sizeof(f->f_pname)); 3206 f->f_type = F_PIPE; 3207 break; 3208 3209 case '*': 3210 f->f_type = F_WALL; 3211 break; 3212 3213 default: 3214 for (i = 0; i < MAXUNAMES && *p; i++) { 3215 for (q = p; *q && *q != ','; ) 3216 q++; 3217 (void)strncpy(f->f_uname[i], p, MAXLOGNAME - 1); 3218 if ((q - p) >= MAXLOGNAME) 3219 f->f_uname[i][MAXLOGNAME - 1] = '\0'; 3220 else 3221 f->f_uname[i][q - p] = '\0'; 3222 while (*q == ',' || *q == ' ') 3223 q++; 3224 p = q; 3225 } 3226 f->f_type = F_USERS; 3227 break; 3228 } 3229 } 3230 3231 /* 3232 * Convert a configuration file line to an nvlist and add to "nvl", which 3233 * contains all of the log configuration processed thus far. 3234 */ 3235 static void 3236 cfline(nvlist_t *nvl, const char *line, const char *prog, const char *host, 3237 const char *pfilter) 3238 { 3239 nvlist_t *nvl_filed; 3240 struct filed f = { }; 3241 const char *p; 3242 3243 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 3244 host, pfilter); 3245 3246 for (int i = 0; i <= LOG_NFACILITIES; i++) 3247 f.f_pmask[i] = INTERNAL_NOPRI; 3248 3249 /* save hostname if any */ 3250 if (host != NULL && *host != '*') { 3251 int hl; 3252 3253 strlcpy(f.f_host, host, sizeof(f.f_host)); 3254 hl = strlen(f.f_host); 3255 if (hl > 0 && f.f_host[hl-1] == '.') 3256 f.f_host[--hl] = '\0'; 3257 /* RFC 5424 prefers logging FQDNs. */ 3258 if (IS_RFC3164_FORMAT) 3259 trimdomain(f.f_host, hl); 3260 } 3261 3262 /* save program name if any */ 3263 if (prog != NULL && *prog != '*') 3264 strlcpy(f.f_program, prog, sizeof(f.f_program)); 3265 3266 /* scan through the list of selectors */ 3267 for (p = line; *p != '\0' && *p != '\t' && *p != ' ';) 3268 p = parse_selector(p, &f); 3269 3270 /* skip to action part */ 3271 while (*p == '\t' || *p == ' ') 3272 p++; 3273 parse_action(nvl, p, &f); 3274 3275 /* An nvlist is heap allocated heap here. */ 3276 nvl_filed = filed_to_nvlist(&f); 3277 close_filed(&f); 3278 3279 if (pfilter && *pfilter != '*') { 3280 nvlist_t *nvl_pfilter; 3281 3282 nvl_pfilter = prop_filter_compile(pfilter); 3283 if (nvl_pfilter == NULL) 3284 err(1, "filter compile error"); 3285 nvlist_add_nvlist(nvl_filed, "f_prop_filter", nvl_pfilter); 3286 } 3287 3288 nvlist_append_nvlist_array(nvl, "filed_list", nvl_filed); 3289 nvlist_destroy(nvl_filed); 3290 } 3291 3292 /* 3293 * Decode a symbolic name to a numeric value 3294 */ 3295 static int 3296 decode(const char *name, const CODE *codetab) 3297 { 3298 const CODE *c; 3299 char *p, buf[40]; 3300 3301 if (isdigit(*name)) 3302 return (atoi(name)); 3303 3304 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3305 if (isupper(*name)) 3306 *p = tolower(*name); 3307 else 3308 *p = *name; 3309 } 3310 *p = '\0'; 3311 for (c = codetab; c->c_name; c++) 3312 if (!strcmp(buf, c->c_name)) 3313 return (c->c_val); 3314 3315 return (-1); 3316 } 3317 3318 static void 3319 markit(void) 3320 { 3321 struct filed *f; 3322 struct deadq_entry *dq, *dq0; 3323 3324 now = time((time_t *)NULL); 3325 MarkSeq += TIMERINTVL; 3326 if (MarkSeq >= MarkInterval) { 3327 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3328 "-- MARK --", MARK); 3329 MarkSeq = 0; 3330 } 3331 3332 STAILQ_FOREACH(f, &fhead, next) { 3333 if (f->f_prevcount && now >= REPEATTIME(f)) { 3334 dprintf("flush %s: repeated %d times, %d sec.\n", 3335 TypeNames[f->f_type], f->f_prevcount, 3336 repeatinterval[f->f_repeatcount]); 3337 fprintlog_successive(f, 0); 3338 BACKOFF(f); 3339 } 3340 } 3341 3342 /* Walk the dead queue, and see if we should signal somebody. */ 3343 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3344 switch (dq->dq_timeout) { 3345 case 0: 3346 /* Already signalled once, try harder now. */ 3347 (void)pdkill(dq->dq_procdesc, SIGKILL); 3348 break; 3349 3350 case 1: 3351 (void)pdkill(dq->dq_procdesc, SIGTERM); 3352 /* FALLTHROUGH. */ 3353 default: 3354 dq->dq_timeout--; 3355 } 3356 } 3357 (void)alarm(TIMERINTVL); 3358 } 3359 3360 /* 3361 * fork off and become a daemon, but wait for the child to come online 3362 * before returning to the parent, or we get disk thrashing at boot etc. 3363 */ 3364 static int 3365 waitdaemon(int maxwait) 3366 { 3367 struct pollfd pollfd; 3368 int events, pipefd[2], status; 3369 pid_t pid; 3370 3371 if (pipe(pipefd) == -1) { 3372 warn("failed to daemonize, pipe"); 3373 die(0); 3374 } 3375 pid = fork(); 3376 if (pid == -1) { 3377 warn("failed to daemonize, fork"); 3378 die(0); 3379 } else if (pid > 0) { 3380 close(pipefd[1]); 3381 pollfd.fd = pipefd[0]; 3382 pollfd.events = POLLHUP; 3383 events = poll(&pollfd, 1, maxwait * 1000); 3384 if (events == -1) 3385 err(1, "failed to daemonize, poll"); 3386 else if (events == 0) 3387 errx(1, "timed out waiting for child"); 3388 if (waitpid(pid, &status, WNOHANG) > 0) { 3389 if (WIFEXITED(status)) 3390 errx(1, "child pid %d exited with return code %d", 3391 pid, WEXITSTATUS(status)); 3392 if (WIFSIGNALED(status)) 3393 errx(1, "child pid %d exited on signal %d%s", 3394 pid, WTERMSIG(status), 3395 WCOREDUMP(status) ? " (core dumped)" : ""); 3396 } 3397 exit(0); 3398 } 3399 close(pipefd[0]); 3400 if (setsid() == -1) { 3401 warn("failed to daemonize, setsid"); 3402 die(0); 3403 } 3404 (void)chdir("/"); 3405 (void)dup2(nulldesc, STDIN_FILENO); 3406 (void)dup2(nulldesc, STDOUT_FILENO); 3407 (void)dup2(nulldesc, STDERR_FILENO); 3408 return (pipefd[1]); 3409 } 3410 3411 /* 3412 * Add `s' to the list of allowable peer addresses to accept messages 3413 * from. 3414 * 3415 * `s' is a string in the form: 3416 * 3417 * [*]domainname[:{servicename|portnumber|*}] 3418 * 3419 * or 3420 * 3421 * netaddr/maskbits[:{servicename|portnumber|*}] 3422 * 3423 * Returns false on error, true if the argument was valid. 3424 */ 3425 static bool 3426 #if defined(INET) || defined(INET6) 3427 allowaddr(char *s) 3428 #else 3429 allowaddr(char *s __unused) 3430 #endif 3431 { 3432 #if defined(INET) || defined(INET6) 3433 char *cp1, *cp2; 3434 struct allowedpeer *ap; 3435 struct servent *se; 3436 int masklen = -1; 3437 struct addrinfo hints, *res = NULL; 3438 #ifdef INET 3439 in_addr_t *addrp, *maskp; 3440 #endif 3441 #ifdef INET6 3442 uint32_t *addr6p, *mask6p; 3443 #endif 3444 char ip[NI_MAXHOST]; 3445 3446 ap = calloc(1, sizeof(*ap)); 3447 if (ap == NULL) 3448 err(1, "malloc failed"); 3449 3450 #ifdef INET6 3451 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3452 #endif 3453 cp1 = s; 3454 if ((cp1 = strrchr(cp1, ':'))) { 3455 /* service/port provided */ 3456 *cp1++ = '\0'; 3457 if (strlen(cp1) == 1 && *cp1 == '*') 3458 /* any port allowed */ 3459 ap->port = 0; 3460 else if ((se = getservbyname(cp1, "udp"))) { 3461 ap->port = ntohs(se->s_port); 3462 } else { 3463 ap->port = strtol(cp1, &cp2, 0); 3464 /* port not numeric */ 3465 if (*cp2 != '\0') 3466 goto err; 3467 } 3468 } else { 3469 if ((se = getservbyname("syslog", "udp"))) 3470 ap->port = ntohs(se->s_port); 3471 else 3472 /* sanity, should not happen */ 3473 ap->port = 514; 3474 } 3475 3476 if ((cp1 = strchr(s, '/')) != NULL && 3477 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3478 *cp1 = '\0'; 3479 if ((masklen = atoi(cp1 + 1)) < 0) 3480 goto err; 3481 } 3482 #ifdef INET6 3483 if (*s == '[') { 3484 cp2 = s + strlen(s) - 1; 3485 if (*cp2 == ']') { 3486 ++s; 3487 *cp2 = '\0'; 3488 } else { 3489 cp2 = NULL; 3490 } 3491 } else { 3492 cp2 = NULL; 3493 } 3494 #endif 3495 hints = (struct addrinfo){ 3496 .ai_family = PF_UNSPEC, 3497 .ai_socktype = SOCK_DGRAM, 3498 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3499 }; 3500 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3501 ap->isnumeric = true; 3502 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3503 ap->a_mask = (struct sockaddr_storage){ 3504 .ss_family = res->ai_family, 3505 .ss_len = res->ai_addrlen 3506 }; 3507 switch (res->ai_family) { 3508 #ifdef INET 3509 case AF_INET: 3510 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3511 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3512 if (masklen < 0) { 3513 /* use default netmask */ 3514 if (IN_CLASSA(ntohl(*addrp))) 3515 *maskp = htonl(IN_CLASSA_NET); 3516 else if (IN_CLASSB(ntohl(*addrp))) 3517 *maskp = htonl(IN_CLASSB_NET); 3518 else 3519 *maskp = htonl(IN_CLASSC_NET); 3520 } else if (masklen == 0) { 3521 *maskp = 0; 3522 } else if (masklen <= 32) { 3523 /* convert masklen to netmask */ 3524 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3525 } else { 3526 goto err; 3527 } 3528 /* Lose any host bits in the network number. */ 3529 *addrp &= *maskp; 3530 break; 3531 #endif 3532 #ifdef INET6 3533 case AF_INET6: 3534 if (masklen > 128) 3535 goto err; 3536 3537 if (masklen < 0) 3538 masklen = 128; 3539 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3540 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3541 /* convert masklen to netmask */ 3542 while (masklen > 0) { 3543 if (masklen < 32) { 3544 *mask6p = 3545 htonl(~(0xffffffff >> masklen)); 3546 *addr6p &= *mask6p; 3547 break; 3548 } else { 3549 *mask6p++ = 0xffffffff; 3550 addr6p++; 3551 masklen -= 32; 3552 } 3553 } 3554 break; 3555 #endif 3556 default: 3557 goto err; 3558 } 3559 freeaddrinfo(res); 3560 } else { 3561 /* arg `s' is domain name */ 3562 ap->isnumeric = false; 3563 ap->a_name = s; 3564 if (cp1) 3565 *cp1 = '/'; 3566 #ifdef INET6 3567 if (cp2) { 3568 *cp2 = ']'; 3569 --s; 3570 } 3571 #endif 3572 } 3573 STAILQ_INSERT_TAIL(&aphead, ap, next); 3574 3575 if (Debug) { 3576 printf("allowaddr: rule "); 3577 if (ap->isnumeric) { 3578 printf("numeric, "); 3579 getnameinfo(sstosa(&ap->a_addr), 3580 (sstosa(&ap->a_addr))->sa_len, 3581 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3582 printf("addr = %s, ", ip); 3583 getnameinfo(sstosa(&ap->a_mask), 3584 (sstosa(&ap->a_mask))->sa_len, 3585 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3586 printf("mask = %s; ", ip); 3587 } else { 3588 printf("domainname = %s; ", ap->a_name); 3589 } 3590 printf("port = %d\n", ap->port); 3591 } 3592 3593 return (true); 3594 err: 3595 if (res != NULL) 3596 freeaddrinfo(res); 3597 free(ap); 3598 #endif 3599 return (false); 3600 } 3601 3602 /* 3603 * Validate that the remote peer has permission to log to us. 3604 */ 3605 static bool 3606 validate(struct sockaddr *sa, const char *hname) 3607 { 3608 int i; 3609 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3610 struct allowedpeer *ap; 3611 #ifdef INET 3612 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3613 #endif 3614 #ifdef INET6 3615 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3616 #endif 3617 struct addrinfo hints, *res; 3618 u_short sport; 3619 3620 /* traditional behaviour, allow everything */ 3621 if (STAILQ_EMPTY(&aphead)) 3622 return (true); 3623 3624 (void)strlcpy(name, hname, sizeof(name)); 3625 hints = (struct addrinfo){ 3626 .ai_family = PF_UNSPEC, 3627 .ai_socktype = SOCK_DGRAM, 3628 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3629 }; 3630 if (cap_getaddrinfo(cap_net, name, NULL, &hints, &res) == 0) 3631 freeaddrinfo(res); 3632 else if (strchr(name, '.') == NULL) { 3633 strlcat(name, ".", sizeof(name)); 3634 strlcat(name, LocalDomain, sizeof(name)); 3635 } 3636 if (cap_getnameinfo(cap_net, sa, sa->sa_len, ip, sizeof(ip), port, 3637 sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3638 return (false); /* for safety, should not occur */ 3639 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3640 ip, port, name); 3641 sport = atoi(port); 3642 3643 /* now, walk down the list */ 3644 i = 0; 3645 STAILQ_FOREACH(ap, &aphead, next) { 3646 i++; 3647 if (ap->port != 0 && ap->port != sport) { 3648 dprintf("rejected in rule %d due to port mismatch.\n", 3649 i); 3650 continue; 3651 } 3652 3653 if (ap->isnumeric) { 3654 if (ap->a_addr.ss_family != sa->sa_family) { 3655 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3656 continue; 3657 } 3658 #ifdef INET 3659 else if (ap->a_addr.ss_family == AF_INET) { 3660 sin4 = satosin(sa); 3661 a4p = satosin(&ap->a_addr); 3662 m4p = satosin(&ap->a_mask); 3663 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3664 != a4p->sin_addr.s_addr) { 3665 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3666 continue; 3667 } 3668 } 3669 #endif 3670 #ifdef INET6 3671 else if (ap->a_addr.ss_family == AF_INET6) { 3672 sin6 = satosin6(sa); 3673 a6p = satosin6(&ap->a_addr); 3674 m6p = satosin6(&ap->a_mask); 3675 if (a6p->sin6_scope_id != 0 && 3676 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3677 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3678 continue; 3679 } 3680 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3681 &a6p->sin6_addr, &m6p->sin6_addr)) { 3682 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3683 continue; 3684 } 3685 } 3686 #endif 3687 else 3688 continue; 3689 } else { 3690 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3691 FNM_NOMATCH) { 3692 dprintf("rejected in rule %d due to name " 3693 "mismatch.\n", i); 3694 continue; 3695 } 3696 } 3697 dprintf("accepted in rule %d.\n", i); 3698 return (true); /* hooray! */ 3699 } 3700 return (false); 3701 } 3702 3703 /* 3704 * Fairly similar to popen(3), but returns an open descriptor, as 3705 * opposed to a FILE *. 3706 * 3707 * Note: This function is wrapped by cap_p_open() when Capsicum support is 3708 * enabled, which allows piped processes to run outside of the capability 3709 * sandbox. 3710 */ 3711 int 3712 p_open(const char *prog, int *rpd) 3713 { 3714 struct sigaction act = { }; 3715 int pfd[2], pd; 3716 pid_t pid; 3717 char *argv[4]; /* sh -c cmd NULL */ 3718 3719 if (pipe(pfd) == -1) 3720 return (-1); 3721 3722 switch ((pid = pdfork(&pd, PD_CLOEXEC))) { 3723 case -1: 3724 return (-1); 3725 3726 case 0: 3727 (void)setsid(); /* Avoid catching SIGHUPs. */ 3728 argv[0] = strdup("sh"); 3729 argv[1] = strdup("-c"); 3730 argv[2] = strdup(prog); 3731 argv[3] = NULL; 3732 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) 3733 err(1, "strdup"); 3734 3735 alarm(0); 3736 act.sa_handler = SIG_DFL; 3737 for (size_t i = 0; i < nitems(sigcatch); ++i) { 3738 if (sigaction(sigcatch[i], &act, NULL) == -1) 3739 err(1, "sigaction"); 3740 } 3741 3742 dup2(pfd[0], STDIN_FILENO); 3743 dup2(nulldesc, STDOUT_FILENO); 3744 dup2(nulldesc, STDERR_FILENO); 3745 closefrom(STDERR_FILENO + 1); 3746 3747 (void)execvp(_PATH_BSHELL, argv); 3748 _exit(255); 3749 } 3750 close(pfd[0]); 3751 /* 3752 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3753 * supposed to get an EWOULDBLOCK on writev(2), which is 3754 * caught by the logic above anyway, which will in turn close 3755 * the pipe, and fork a new logging subprocess if necessary. 3756 * The stale subprocess will be killed some time later unless 3757 * it terminated itself due to closing its input pipe (so we 3758 * get rid of really dead puppies). 3759 */ 3760 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3761 /* This is bad. */ 3762 dprintf("Warning: cannot change pipe to PID %d to non-blocking" 3763 "behaviour.", pid); 3764 } 3765 *rpd = pd; 3766 return (pfd[1]); 3767 } 3768 3769 static struct deadq_entry * 3770 deadq_enter(int pd) 3771 { 3772 struct deadq_entry *dq; 3773 3774 if (pd == -1) 3775 return (NULL); 3776 3777 dq = malloc(sizeof(*dq)); 3778 if (dq == NULL) { 3779 logerror("malloc"); 3780 exit(1); 3781 } 3782 3783 dq->dq_procdesc = pd; 3784 dq->dq_timeout = DQ_TIMO_INIT; 3785 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3786 return (dq); 3787 } 3788 3789 static void 3790 deadq_remove(struct deadq_entry *dq) 3791 { 3792 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3793 free(dq); 3794 } 3795 3796 static void 3797 log_deadchild(int pd, int status, const struct filed *f) 3798 { 3799 pid_t pid; 3800 int code; 3801 char buf[256]; 3802 const char *reason; 3803 3804 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 3805 if (WIFSIGNALED(status)) { 3806 reason = "due to signal"; 3807 code = WTERMSIG(status); 3808 } else { 3809 reason = "with status"; 3810 code = WEXITSTATUS(status); 3811 if (code == 0) 3812 return; 3813 } 3814 if (pdgetpid(pd, &pid) == -1) 3815 err(1, "pdgetpid"); 3816 (void)snprintf(buf, sizeof(buf), 3817 "Logging subprocess %d (%s) exited %s %d.", 3818 pid, f->f_pname, reason, code); 3819 logerror(buf); 3820 } 3821 3822 static struct socklist * 3823 socksetup(struct addrinfo *ai, const char *name, mode_t mode) 3824 { 3825 struct socklist *sl; 3826 int (*sl_recv)(struct socklist *); 3827 int s, optval = 1; 3828 3829 if (ai->ai_family != AF_LOCAL && SecureMode > 1) { 3830 /* Only AF_LOCAL in secure mode. */ 3831 return (NULL); 3832 } 3833 if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL && 3834 ai->ai_family != family) 3835 return (NULL); 3836 3837 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 3838 if (s < 0) { 3839 logerror("socket"); 3840 return (NULL); 3841 } 3842 #ifdef INET6 3843 if (ai->ai_family == AF_INET6) { 3844 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval, 3845 sizeof(int)) < 0) { 3846 logerror("setsockopt(IPV6_V6ONLY)"); 3847 close(s); 3848 return (NULL); 3849 } 3850 } 3851 #endif 3852 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval, 3853 sizeof(int)) < 0) { 3854 logerror("setsockopt(SO_REUSEADDR)"); 3855 close(s); 3856 return (NULL); 3857 } 3858 3859 /* 3860 * Bind INET and UNIX-domain sockets. 3861 * 3862 * A UNIX-domain socket is always bound to a pathname 3863 * regardless of -N flag. 3864 * 3865 * For INET sockets, RFC 3164 recommends that client 3866 * side message should come from the privileged syslogd port. 3867 * 3868 * If the system administrator chooses not to obey 3869 * this, we can skip the bind() step so that the 3870 * system will choose a port for us. 3871 */ 3872 if (ai->ai_family == AF_LOCAL) 3873 unlink(name); 3874 if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) { 3875 mode_t mask; 3876 int error; 3877 3878 if (ai->ai_family == AF_LOCAL && fchmod(s, mode) < 0) { 3879 dprintf("fchmod %s: %s\n", name, strerror(errno)); 3880 close(s); 3881 return (NULL); 3882 } 3883 3884 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 3885 sizeof(int)) < 0) { 3886 logerror("setsockopt(SO_REUSEPORT)"); 3887 close(s); 3888 return (NULL); 3889 } 3890 3891 /* 3892 * For AF_LOCAL sockets, the process umask is applied to the 3893 * mode set above, so temporarily clear it to ensure that the 3894 * socket always has the correct permissions. 3895 */ 3896 mask = umask(0); 3897 error = bind(s, ai->ai_addr, ai->ai_addrlen); 3898 (void)umask(mask); 3899 if (error < 0) { 3900 logerror("bind"); 3901 close(s); 3902 return (NULL); 3903 } 3904 if (ai->ai_family == AF_LOCAL || SecureMode == 0) 3905 increase_rcvbuf(s); 3906 } 3907 dprintf("new socket fd is %d\n", s); 3908 sl_recv = socklist_recv_sock; 3909 #if defined(INET) || defined(INET6) 3910 if (SecureMode && (ai->ai_family == AF_INET || 3911 ai->ai_family == AF_INET6)) { 3912 dprintf("shutdown\n"); 3913 /* Forbid communication in secure mode. */ 3914 if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) { 3915 logerror("shutdown"); 3916 if (!Debug) 3917 die(0); 3918 } 3919 sl_recv = NULL; 3920 } else 3921 #endif 3922 dprintf("listening on socket\n"); 3923 dprintf("sending on socket\n"); 3924 /* Copy *ai->ai_addr to the tail of struct socklist if any. */ 3925 sl = calloc(1, sizeof(*sl) + ai->ai_addrlen); 3926 if (sl == NULL) 3927 err(1, "malloc failed"); 3928 sl->sl_socket = s; 3929 if (ai->ai_family == AF_LOCAL) { 3930 char *name2 = strdup(name); 3931 if (name2 == NULL) 3932 err(1, "strdup failed"); 3933 sl->sl_name = strdup(basename(name2)); 3934 sl->sl_dirfd = open(dirname(name2), O_DIRECTORY); 3935 if (sl->sl_name == NULL || sl->sl_dirfd == -1) 3936 err(1, "failed to save dir info for %s", name); 3937 free(name2); 3938 } 3939 sl->sl_recv = sl_recv; 3940 (void)memcpy(&sl->sl_ai, ai, sizeof(*ai)); 3941 if (ai->ai_addrlen > 0) { 3942 (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); 3943 sl->sl_sa = (struct sockaddr *)(sl + 1); 3944 } else { 3945 sl->sl_sa = NULL; 3946 } 3947 return (sl); 3948 } 3949 3950 static void 3951 increase_rcvbuf(int fd) 3952 { 3953 socklen_t len; 3954 3955 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3956 &(socklen_t){sizeof(len)}) == 0) { 3957 if (len < RCVBUF_MINSIZE) { 3958 len = RCVBUF_MINSIZE; 3959 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3960 } 3961 } 3962 } 3963