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 switch (f->f_type) { 374 case F_FORW: 375 if (f->f_addr_fds != NULL) { 376 free(f->f_addrs); 377 for (size_t i = 0; i < f->f_num_addr_fds; ++i) 378 close(f->f_addr_fds[i]); 379 free(f->f_addr_fds); 380 f->f_addr_fds = NULL; 381 f->f_num_addr_fds = 0; 382 } 383 /* FALLTHROUGH */ 384 case F_FILE: 385 case F_TTY: 386 case F_CONSOLE: 387 f->f_type = F_UNUSED; 388 break; 389 case F_PIPE: 390 if (f->f_procdesc != -1) { 391 /* 392 * Close the procdesc, killing the underlying 393 * process (if it is still alive). 394 */ 395 (void)close(f->f_procdesc); 396 f->f_procdesc = -1; 397 /* 398 * The pipe process is guaranteed to be dead now, 399 * so remove it from the deadq. 400 */ 401 if (f->f_dq != NULL) { 402 deadq_remove(f->f_dq); 403 f->f_dq = NULL; 404 } 405 } 406 break; 407 default: 408 break; 409 } 410 if (f->f_file != -1) 411 (void)close(f->f_file); 412 f->f_file = -1; 413 } 414 415 static void 416 addpeer(const char *name, const char *serv, mode_t mode) 417 { 418 struct peer *pe = calloc(1, sizeof(*pe)); 419 if (pe == NULL) 420 err(1, "malloc failed"); 421 pe->pe_name = name; 422 pe->pe_serv = serv; 423 pe->pe_mode = mode; 424 STAILQ_INSERT_TAIL(&pqueue, pe, next); 425 } 426 427 static void 428 addsock(const char *name, const char *serv, mode_t mode) 429 { 430 struct addrinfo hints = { }, *res, *res0; 431 struct socklist *sl; 432 int error; 433 char *cp, *msgbuf; 434 435 /* 436 * We have to handle this case for backwards compatibility: 437 * If there are two (or more) colons but no '[' and ']', 438 * assume this is an inet6 address without a service. 439 */ 440 if (name != NULL) { 441 #ifdef INET6 442 if (name[0] == '[' && 443 (cp = strchr(name + 1, ']')) != NULL) { 444 name = &name[1]; 445 *cp = '\0'; 446 if (cp[1] == ':' && cp[2] != '\0') 447 serv = cp + 2; 448 } else { 449 #endif 450 cp = strchr(name, ':'); 451 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 452 *cp = '\0'; 453 if (cp[1] != '\0') 454 serv = cp + 1; 455 if (cp == name) 456 name = NULL; 457 } 458 #ifdef INET6 459 } 460 #endif 461 } 462 hints.ai_family = AF_UNSPEC; 463 hints.ai_socktype = SOCK_DGRAM; 464 hints.ai_flags = AI_PASSIVE; 465 if (name != NULL) 466 dprintf("Trying peer: %s\n", name); 467 if (serv == NULL) 468 serv = "syslog"; 469 error = getaddrinfo(name, serv, &hints, &res0); 470 if (error == EAI_NONAME && name == NULL && SecureMode > 1) { 471 /* 472 * If we're in secure mode, we won't open inet sockets anyway. 473 * This failure can arise legitimately when running in a jail 474 * without networking. 475 */ 476 return; 477 } 478 if (error) { 479 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 480 name == NULL ? "" : name, serv, 481 gai_strerror(error)); 482 errno = 0; 483 if (msgbuf == NULL) 484 logerror(gai_strerror(error)); 485 else 486 logerror(msgbuf); 487 free(msgbuf); 488 die(0); 489 } 490 for (res = res0; res != NULL; res = res->ai_next) { 491 sl = socksetup(res, name, mode); 492 if (sl == NULL) 493 continue; 494 STAILQ_INSERT_TAIL(&shead, sl, next); 495 } 496 freeaddrinfo(res0); 497 } 498 499 static void 500 addfile(int fd) 501 { 502 struct socklist *sl = calloc(1, sizeof(*sl)); 503 if (sl == NULL) 504 err(1, "malloc failed"); 505 sl->sl_socket = fd; 506 sl->sl_recv = socklist_recv_file; 507 STAILQ_INSERT_TAIL(&shead, sl, next); 508 } 509 510 int 511 main(int argc, char *argv[]) 512 { 513 struct sigaction act = { }; 514 struct kevent ev; 515 struct socklist *sl; 516 pid_t spid; 517 int ch, ppipe_w = -1, s; 518 char *p; 519 bool bflag = false, pflag = false, Sflag = false; 520 521 if (madvise(NULL, 0, MADV_PROTECT) != 0) 522 dprintf("madvise() failed: %s\n", strerror(errno)); 523 524 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) 525 != -1) 526 switch (ch) { 527 #ifdef INET 528 case '4': 529 family = PF_INET; 530 break; 531 #endif 532 #ifdef INET6 533 case '6': 534 family = PF_INET6; 535 break; 536 #endif 537 case '8': 538 mask_C1 = 0; 539 break; 540 case 'A': 541 send_to_all = true; 542 break; 543 case 'a': /* allow specific network addresses only */ 544 if (!allowaddr(optarg)) 545 usage(); 546 break; 547 case 'b': 548 bflag = true; 549 p = strchr(optarg, ']'); 550 if (p != NULL) 551 p = strchr(p + 1, ':'); 552 else { 553 p = strchr(optarg, ':'); 554 if (p != NULL && strchr(p + 1, ':') != NULL) 555 p = NULL; /* backward compatibility */ 556 } 557 if (p == NULL) { 558 /* A hostname or filename only. */ 559 addpeer(optarg, "syslog", 0); 560 } else { 561 /* The case of "name:service". */ 562 *p++ = '\0'; 563 addpeer(strlen(optarg) == 0 ? NULL : optarg, 564 p, 0); 565 } 566 break; 567 case 'c': 568 no_compress++; 569 break; 570 case 'C': 571 logflags |= O_CREAT; 572 break; 573 case 'd': /* debug */ 574 Debug = true; 575 break; 576 case 'f': /* configuration file */ 577 ConfFile = optarg; 578 break; 579 case 'F': /* run in foreground instead of daemon */ 580 Foreground = true; 581 break; 582 case 'H': 583 RemoteHostname = true; 584 break; 585 case 'k': /* keep remote kern fac */ 586 KeepKernFac = true; 587 break; 588 case 'l': 589 case 'p': 590 case 'S': 591 { 592 long perml; 593 mode_t mode; 594 char *name, *ep; 595 596 if (ch == 'l') 597 mode = DEFFILEMODE; 598 else if (ch == 'p') { 599 mode = DEFFILEMODE; 600 pflag = true; 601 } else { 602 mode = S_IRUSR | S_IWUSR; 603 Sflag = true; 604 } 605 if (optarg[0] == '/') 606 name = optarg; 607 else if ((name = strchr(optarg, ':')) != NULL) { 608 *name++ = '\0'; 609 if (name[0] != '/') 610 errx(1, "socket name must be absolute " 611 "path"); 612 if (isdigit(*optarg)) { 613 perml = strtol(optarg, &ep, 8); 614 if (*ep || perml < 0 || 615 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 616 errx(1, "invalid mode %s, exiting", 617 optarg); 618 mode = (mode_t )perml; 619 } else 620 errx(1, "invalid mode %s, exiting", 621 optarg); 622 } else 623 errx(1, "invalid filename %s, exiting", 624 optarg); 625 addpeer(name, NULL, mode); 626 break; 627 } 628 case 'M': /* max length of forwarded message */ 629 MaxForwardLen = atoi(optarg); 630 if (MaxForwardLen < 480) 631 errx(1, "minimum length limit of forwarded " 632 "messages is 480 bytes"); 633 break; 634 case 'm': /* mark interval */ 635 MarkInterval = atoi(optarg) * 60; 636 break; 637 case 'N': 638 NoBind = true; 639 if (!SecureMode) 640 SecureMode = 1; 641 break; 642 case 'n': 643 resolve = false; 644 break; 645 case 'O': 646 if (strcmp(optarg, "bsd") == 0 || 647 strcmp(optarg, "rfc3164") == 0) 648 output_format = FORMAT_BSD_LEGACY; 649 else if (strcmp(optarg, "rfc3164-strict") == 0) 650 output_format = FORMAT_RFC3164_STRICT; 651 else if (strcmp(optarg, "syslog") == 0 || 652 strcmp(optarg, "rfc5424") == 0) 653 output_format = FORMAT_RFC5424; 654 else 655 usage(); 656 break; 657 case 'o': 658 use_bootfile = true; 659 break; 660 case 'P': /* path for alt. PID */ 661 PidFile = optarg; 662 break; 663 case 's': /* no network mode */ 664 SecureMode++; 665 break; 666 case 'T': 667 RemoteAddDate = true; 668 break; 669 case 'u': /* only log specified priority */ 670 UniquePriority = true; 671 break; 672 case 'v': /* log facility and priority */ 673 LogFacPri++; 674 break; 675 default: 676 usage(); 677 } 678 if ((argc -= optind) != 0) 679 usage(); 680 681 if (IS_RFC3164_FORMAT && MaxForwardLen > 1024) 682 errx(1, "RFC 3164 messages may not exceed 1024 bytes"); 683 684 pfh = pidfile_open(PidFile, 0600, &spid); 685 if (pfh == NULL) { 686 if (errno == EEXIST) 687 errx(1, "syslogd already running, pid: %d", spid); 688 warn("cannot open pid file"); 689 } 690 691 /* 692 * Now that flags have been parsed, we know if we're in 693 * secure mode. Add peers to the socklist, if allowed. 694 */ 695 while (!STAILQ_EMPTY(&pqueue)) { 696 struct peer *pe = STAILQ_FIRST(&pqueue); 697 STAILQ_REMOVE_HEAD(&pqueue, next); 698 addsock(pe->pe_name, pe->pe_serv, pe->pe_mode); 699 free(pe); 700 } 701 /* Listen by default: /dev/klog. */ 702 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 703 if (s < 0) { 704 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 705 } else { 706 addfile(s); 707 } 708 /* Listen by default: *:514 if no -b flag. */ 709 if (bflag == 0) 710 addsock(NULL, "syslog", 0); 711 /* Listen by default: /var/run/log if no -p flag. */ 712 if (pflag == 0) 713 addsock(_PATH_LOG, NULL, DEFFILEMODE); 714 /* Listen by default: /var/run/logpriv if no -S flag. */ 715 if (Sflag == 0) 716 addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR); 717 718 consfile.f_type = F_CONSOLE; 719 consfile.f_file = -1; 720 (void)strlcpy(consfile.f_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1, 721 sizeof(consfile.f_fname)); 722 723 nulldesc = open(_PATH_DEVNULL, O_RDWR); 724 if (nulldesc == -1) { 725 warn("cannot open %s", _PATH_DEVNULL); 726 pidfile_remove(pfh); 727 exit(1); 728 } 729 730 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 731 732 if (!Foreground && !Debug) 733 ppipe_w = waitdaemon(30); 734 else if (Debug) 735 setlinebuf(stdout); 736 737 kq = kqueue(); 738 if (kq == -1) { 739 warn("failed to initialize kqueue"); 740 pidfile_remove(pfh); 741 exit(1); 742 } 743 STAILQ_FOREACH(sl, &shead, next) { 744 if (sl->sl_recv == NULL) 745 continue; 746 EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl); 747 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 748 warn("failed to add kevent to kqueue"); 749 pidfile_remove(pfh); 750 exit(1); 751 } 752 } 753 754 /* 755 * Syslogd will not reap its children via wait(). 756 * When SIGCHLD is ignored, zombie processes are 757 * not created. A child's PID will be recycled 758 * upon its exit. 759 */ 760 act.sa_handler = SIG_IGN; 761 for (size_t i = 0; i < nitems(sigcatch); ++i) { 762 EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 763 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 764 warn("failed to add kevent to kqueue"); 765 pidfile_remove(pfh); 766 exit(1); 767 } 768 if (sigaction(sigcatch[i], &act, NULL) == -1) { 769 warn("failed to apply signal handler"); 770 pidfile_remove(pfh); 771 exit(1); 772 } 773 } 774 (void)alarm(TIMERINTVL); 775 776 /* tuck my process id away */ 777 pidfile_write(pfh); 778 779 dprintf("off & running....\n"); 780 init(false); 781 for (;;) { 782 if (needdofsync) { 783 dofsync(); 784 if (ppipe_w != -1) { 785 /* 786 * Close our end of the pipe so our 787 * parent knows that we have finished 788 * initialization. 789 */ 790 (void)close(ppipe_w); 791 ppipe_w = -1; 792 } 793 } 794 if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) { 795 if (errno != EINTR) 796 logerror("kevent"); 797 continue; 798 } 799 switch (ev.filter) { 800 case EVFILT_READ: 801 sl = ev.udata; 802 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 803 sl->sl_recv(sl); 804 break; 805 case EVFILT_SIGNAL: 806 switch (ev.ident) { 807 case SIGHUP: 808 init(true); 809 break; 810 case SIGINT: 811 case SIGQUIT: 812 case SIGTERM: 813 if (ev.ident == SIGTERM || Debug) 814 die(ev.ident); 815 break; 816 case SIGALRM: 817 markit(); 818 break; 819 } 820 break; 821 case EVFILT_PROCDESC: 822 if ((ev.fflags & NOTE_EXIT) != 0) { 823 log_deadchild(ev.ident, ev.data, ev.udata); 824 close_filed(ev.udata); 825 } 826 break; 827 } 828 } 829 } 830 831 static int 832 socklist_recv_sock(struct socklist *sl) 833 { 834 struct sockaddr_storage ss; 835 struct sockaddr *sa = (struct sockaddr *)&ss; 836 socklen_t sslen; 837 const char *hname; 838 char line[MAXLINE + 1]; 839 int len; 840 841 sslen = sizeof(ss); 842 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 843 dprintf("received sa_len = %d\n", sslen); 844 if (len == 0) 845 return (-1); 846 if (len < 0) { 847 if (errno != EINTR) 848 logerror("recvfrom"); 849 return (-1); 850 } 851 /* Received valid data. */ 852 line[len] = '\0'; 853 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 854 hname = LocalHostName; 855 else { 856 hname = cvthname(sa); 857 unmapped(sa); 858 if (validate(sa, hname) == 0) { 859 dprintf("Message from %s was ignored.", hname); 860 return (-1); 861 } 862 } 863 parsemsg(hname, line); 864 865 return (0); 866 } 867 868 static void 869 unmapped(struct sockaddr *sa) 870 { 871 #if defined(INET) && defined(INET6) 872 struct sockaddr_in6 *sin6; 873 struct sockaddr_in sin; 874 875 if (sa == NULL || 876 sa->sa_family != AF_INET6 || 877 sa->sa_len != sizeof(*sin6)) 878 return; 879 sin6 = satosin6(sa); 880 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 881 return; 882 sin = (struct sockaddr_in){ 883 .sin_family = AF_INET, 884 .sin_len = sizeof(sin), 885 .sin_port = sin6->sin6_port 886 }; 887 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 888 sizeof(sin.sin_addr)); 889 memcpy(sa, &sin, sizeof(sin)); 890 #else 891 if (sa == NULL) 892 return; 893 #endif 894 } 895 896 static void 897 usage(void) 898 { 899 900 fprintf(stderr, 901 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 902 " [-b bind_address] [-f config_file]\n" 903 " [-l [mode:]path] [-M fwd_length]\n" 904 " [-m mark_interval] [-O format] [-P pid_file]\n" 905 " [-p log_socket] [-S logpriv_socket]\n"); 906 exit(1); 907 } 908 909 /* 910 * Removes characters from log messages that are unsafe to display. 911 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 912 */ 913 static void 914 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 915 { 916 char *q; 917 int c; 918 919 q = out; 920 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 921 if (mask_C1 && (c & 0x80) && c < 0xA0) { 922 c &= 0x7F; 923 *q++ = 'M'; 924 *q++ = '-'; 925 } 926 if (isascii(c) && iscntrl(c)) { 927 if (c == '\n') { 928 *q++ = ' '; 929 } else if (c == '\t') { 930 *q++ = '\t'; 931 } else { 932 *q++ = '^'; 933 *q++ = c ^ 0100; 934 } 935 } else { 936 *q++ = c; 937 } 938 } 939 *q = '\0'; 940 } 941 942 /* 943 * Parses a syslog message according to RFC 5424, assuming that PRI and 944 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 945 * parsed result is passed to logmsg(). 946 */ 947 static void 948 parsemsg_rfc5424(const char *from, int pri, char *msg) 949 { 950 const struct logtime *timestamp; 951 struct logtime timestamp_remote; 952 const char *omsg, *hostname, *app_name, *procid, *msgid, 953 *structured_data; 954 char line[MAXLINE + 1]; 955 956 #define FAIL_IF(field, expr) do { \ 957 if (expr) { \ 958 dprintf("Failed to parse " field " from %s: %s\n", \ 959 from, omsg); \ 960 return; \ 961 } \ 962 } while (0) 963 #define PARSE_CHAR(field, sep) do { \ 964 FAIL_IF(field, *msg != sep); \ 965 ++msg; \ 966 } while (0) 967 #define IF_NOT_NILVALUE(var) \ 968 if (msg[0] == '-' && msg[1] == ' ') { \ 969 msg += 2; \ 970 var = NULL; \ 971 } else if (msg[0] == '-' && msg[1] == '\0') { \ 972 ++msg; \ 973 var = NULL; \ 974 } else 975 976 omsg = msg; 977 IF_NOT_NILVALUE(timestamp) { 978 /* Parse RFC 3339-like timestamp. */ 979 #define PARSE_NUMBER(dest, length, min, max) do { \ 980 int i, v; \ 981 \ 982 v = 0; \ 983 for (i = 0; i < length; ++i) { \ 984 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 985 v = v * 10 + *msg++ - '0'; \ 986 } \ 987 FAIL_IF("TIMESTAMP", v < min || v > max); \ 988 dest = v; \ 989 } while (0) 990 /* Date and time. */ 991 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 992 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 993 timestamp_remote.tm.tm_year -= 1900; 994 PARSE_CHAR("TIMESTAMP", '-'); 995 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 996 --timestamp_remote.tm.tm_mon; 997 PARSE_CHAR("TIMESTAMP", '-'); 998 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 999 PARSE_CHAR("TIMESTAMP", 'T'); 1000 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 1001 PARSE_CHAR("TIMESTAMP", ':'); 1002 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1003 PARSE_CHAR("TIMESTAMP", ':'); 1004 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1005 /* Perform normalization. */ 1006 timegm(×tamp_remote.tm); 1007 /* Optional: fractional seconds. */ 1008 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1009 int i; 1010 1011 ++msg; 1012 for (i = 100000; i != 0; i /= 10) { 1013 if (*msg < '0' || *msg > '9') 1014 break; 1015 timestamp_remote.usec += (*msg++ - '0') * i; 1016 } 1017 } 1018 /* Timezone. */ 1019 if (*msg == 'Z') { 1020 /* UTC. */ 1021 ++msg; 1022 } else { 1023 int sign, tz_hour, tz_min; 1024 1025 /* Local time zone offset. */ 1026 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1027 sign = *msg++ == '-' ? -1 : 1; 1028 PARSE_NUMBER(tz_hour, 2, 0, 23); 1029 PARSE_CHAR("TIMESTAMP", ':'); 1030 PARSE_NUMBER(tz_min, 2, 0, 59); 1031 timestamp_remote.tm.tm_gmtoff = 1032 sign * (tz_hour * 3600 + tz_min * 60); 1033 } 1034 #undef PARSE_NUMBER 1035 PARSE_CHAR("TIMESTAMP", ' '); 1036 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1037 } 1038 1039 /* String fields part of the HEADER. */ 1040 #define PARSE_STRING(field, var) \ 1041 IF_NOT_NILVALUE(var) { \ 1042 var = msg; \ 1043 while (*msg >= '!' && *msg <= '~') \ 1044 ++msg; \ 1045 FAIL_IF(field, var == msg); \ 1046 PARSE_CHAR(field, ' '); \ 1047 msg[-1] = '\0'; \ 1048 } 1049 PARSE_STRING("HOSTNAME", hostname); 1050 if (hostname == NULL || !RemoteHostname) 1051 hostname = from; 1052 PARSE_STRING("APP-NAME", app_name); 1053 PARSE_STRING("PROCID", procid); 1054 PARSE_STRING("MSGID", msgid); 1055 #undef PARSE_STRING 1056 1057 /* Structured data. */ 1058 #define PARSE_SD_NAME() do { \ 1059 const char *start; \ 1060 \ 1061 start = msg; \ 1062 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1063 *msg != ']' && *msg != '"') \ 1064 ++msg; \ 1065 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1066 } while (0) 1067 IF_NOT_NILVALUE(structured_data) { 1068 structured_data = msg; 1069 /* SD-ELEMENT. */ 1070 while (*msg == '[') { 1071 ++msg; 1072 /* SD-ID. */ 1073 PARSE_SD_NAME(); 1074 /* SD-PARAM. */ 1075 while (*msg == ' ') { 1076 ++msg; 1077 /* PARAM-NAME. */ 1078 PARSE_SD_NAME(); 1079 PARSE_CHAR("STRUCTURED-NAME", '='); 1080 PARSE_CHAR("STRUCTURED-NAME", '"'); 1081 while (*msg != '"') { 1082 FAIL_IF("STRUCTURED-NAME", 1083 *msg == '\0'); 1084 if (*msg++ == '\\') { 1085 FAIL_IF("STRUCTURED-NAME", 1086 *msg == '\0'); 1087 ++msg; 1088 } 1089 } 1090 ++msg; 1091 } 1092 PARSE_CHAR("STRUCTURED-NAME", ']'); 1093 } 1094 PARSE_CHAR("STRUCTURED-NAME", ' '); 1095 msg[-1] = '\0'; 1096 } 1097 #undef PARSE_SD_NAME 1098 1099 #undef FAIL_IF 1100 #undef PARSE_CHAR 1101 #undef IF_NOT_NILVALUE 1102 1103 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1104 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1105 structured_data, line, 0); 1106 } 1107 1108 /* 1109 * Returns the length of the application name ("TAG" in RFC 3164 1110 * terminology) and process ID from a message if present. 1111 */ 1112 static void 1113 parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, 1114 ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) 1115 { 1116 const char *m, *procid_begin; 1117 size_t app_name_length, procid_length; 1118 1119 m = msg; 1120 1121 /* Application name. */ 1122 app_name_length = strspn(m, 1123 "abcdefghijklmnopqrstuvwxyz" 1124 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1125 "0123456789" 1126 "_-/"); 1127 if (app_name_length == 0) 1128 goto bad; 1129 m += app_name_length; 1130 1131 /* Process identifier (optional). */ 1132 if (*m == '[') { 1133 procid_begin = ++m; 1134 procid_length = strspn(m, "0123456789"); 1135 if (procid_length == 0) 1136 goto bad; 1137 m += procid_length; 1138 if (*m++ != ']') 1139 goto bad; 1140 } else { 1141 procid_begin = NULL; 1142 procid_length = 0; 1143 } 1144 1145 /* Separator. */ 1146 if (m[0] != ':' || m[1] != ' ') 1147 goto bad; 1148 1149 *app_name_length_p = app_name_length; 1150 if (procid_begin_offset_p != NULL) 1151 *procid_begin_offset_p = 1152 procid_begin == NULL ? 0 : procid_begin - msg; 1153 if (procid_length_p != NULL) 1154 *procid_length_p = procid_length; 1155 return; 1156 bad: 1157 *app_name_length_p = 0; 1158 if (procid_begin_offset_p != NULL) 1159 *procid_begin_offset_p = 0; 1160 if (procid_length_p != NULL) 1161 *procid_length_p = 0; 1162 } 1163 1164 /* 1165 * Trims the application name ("TAG" in RFC 3164 terminology) and 1166 * process ID from a message if present. 1167 */ 1168 static void 1169 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1170 const char **procid) 1171 { 1172 char *m, *app_name_begin, *procid_begin; 1173 size_t app_name_length, procid_length; 1174 ptrdiff_t procid_begin_offset; 1175 1176 m = *msg; 1177 app_name_begin = m; 1178 1179 parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, 1180 &procid_begin_offset, &procid_length); 1181 if (app_name_length == 0) 1182 goto bad; 1183 procid_begin = procid_begin_offset == 0 ? NULL : 1184 app_name_begin + procid_begin_offset; 1185 1186 /* Split strings from input. */ 1187 app_name_begin[app_name_length] = '\0'; 1188 m += app_name_length + 1; 1189 if (procid_begin != NULL) { 1190 procid_begin[procid_length] = '\0'; 1191 m += procid_length + 2; 1192 } 1193 1194 *msg = m + 1; 1195 *app_name = app_name_begin; 1196 *procid = procid_begin; 1197 return; 1198 bad: 1199 *app_name = NULL; 1200 *procid = NULL; 1201 } 1202 1203 /* 1204 * Parses a syslog message according to RFC 3164, assuming that PRI 1205 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1206 * result is passed to logmsg(). 1207 */ 1208 static void 1209 parsemsg_rfc3164(const char *from, int pri, char *msg) 1210 { 1211 struct tm tm_parsed; 1212 const struct logtime *timestamp; 1213 struct logtime timestamp_remote; 1214 const char *app_name, *procid; 1215 size_t i, msglen; 1216 char line[MAXLINE + 1]; 1217 1218 /* 1219 * Parse the TIMESTAMP provided by the remote side. If none is 1220 * found, assume this is not an RFC 3164 formatted message, 1221 * only containing a TAG and a MSG. 1222 */ 1223 timestamp = NULL; 1224 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1225 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1226 msg += RFC3164_DATELEN + 1; 1227 if (!RemoteAddDate) { 1228 struct tm tm_now; 1229 time_t t_now; 1230 int year; 1231 1232 /* 1233 * As the timestamp does not contain the year 1234 * number, daylight saving time information, nor 1235 * a time zone, attempt to infer it. Due to 1236 * clock skews, the timestamp may even be part 1237 * of the next year. Use the last year for which 1238 * the timestamp is at most one week in the 1239 * future. 1240 * 1241 * This loop can only run for at most three 1242 * iterations before terminating. 1243 */ 1244 t_now = time(NULL); 1245 localtime_r(&t_now, &tm_now); 1246 for (year = tm_now.tm_year + 1;; --year) { 1247 assert(year >= tm_now.tm_year - 1); 1248 timestamp_remote.tm = tm_parsed; 1249 timestamp_remote.tm.tm_year = year; 1250 timestamp_remote.tm.tm_isdst = -1; 1251 timestamp_remote.usec = 0; 1252 if (mktime(×tamp_remote.tm) < 1253 t_now + 7 * 24 * 60 * 60) 1254 break; 1255 } 1256 timestamp = ×tamp_remote; 1257 } 1258 1259 /* 1260 * A single space character MUST also follow the HOSTNAME field. 1261 */ 1262 msglen = strlen(msg); 1263 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1264 if (msg[i] == ' ') { 1265 if (RemoteHostname) { 1266 msg[i] = '\0'; 1267 from = msg; 1268 } 1269 msg += i + 1; 1270 break; 1271 } 1272 /* 1273 * Support non RFC compliant messages, without hostname. 1274 */ 1275 if (msg[i] == ':') 1276 break; 1277 } 1278 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1279 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1280 return; 1281 } 1282 } 1283 1284 /* Remove the TAG, if present. */ 1285 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1286 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1287 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1288 } 1289 1290 /* 1291 * Takes a raw input line, extracts PRI and determines whether the 1292 * message is formatted according to RFC 3164 or RFC 5424. Continues 1293 * parsing of addition fields in the message according to those 1294 * standards and prints the message on the appropriate log files. 1295 */ 1296 static void 1297 parsemsg(const char *from, char *msg) 1298 { 1299 char *q; 1300 long n; 1301 size_t i; 1302 int pri; 1303 1304 i = -1; 1305 pri = DEFUPRI; 1306 1307 /* Parse PRI. */ 1308 if (msg[0] == '<' && isdigit(msg[1])) { 1309 for (i = 2; i <= 4; i++) { 1310 if (msg[i] == '>') { 1311 errno = 0; 1312 n = strtol(msg + 1, &q, 10); 1313 if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) { 1314 pri = n; 1315 msg += i + 1; 1316 i = 0; 1317 } 1318 break; 1319 } 1320 } 1321 } 1322 1323 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1324 pri = DEFUPRI; 1325 1326 /* 1327 * Don't allow users to log kernel messages. 1328 * NOTE: since LOG_KERN == 0 this will also match 1329 * messages with no facility specified. 1330 */ 1331 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1332 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1333 1334 /* Parse VERSION. */ 1335 if (i == 0 && msg[0] == '1' && msg[1] == ' ') 1336 parsemsg_rfc5424(from, pri, msg + 2); 1337 else 1338 parsemsg_rfc3164(from, pri, msg); 1339 } 1340 1341 /* 1342 * Read /dev/klog while data are available, split into lines. 1343 */ 1344 static int 1345 socklist_recv_file(struct socklist *sl) 1346 { 1347 char *p, *q, line[MAXLINE + 1]; 1348 int len, i; 1349 1350 len = 0; 1351 for (;;) { 1352 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1353 if (i > 0) { 1354 line[i + len] = '\0'; 1355 } else { 1356 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1357 logerror("klog"); 1358 close(sl->sl_socket); 1359 sl->sl_socket = -1; 1360 } 1361 break; 1362 } 1363 1364 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1365 *q = '\0'; 1366 printsys(p); 1367 } 1368 len = strlen(p); 1369 if (len >= MAXLINE - 1) { 1370 printsys(p); 1371 len = 0; 1372 } 1373 if (len > 0) 1374 memmove(line, p, len + 1); 1375 } 1376 if (len > 0) 1377 printsys(line); 1378 1379 return (len); 1380 } 1381 1382 /* 1383 * Take a raw input line from /dev/klog, format similar to syslog(). 1384 */ 1385 static void 1386 printsys(char *msg) 1387 { 1388 char *p, *q; 1389 long n; 1390 int flags, isprintf, pri; 1391 1392 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1393 p = msg; 1394 pri = DEFSPRI; 1395 isprintf = 1; 1396 if (*p == '<') { 1397 errno = 0; 1398 n = strtol(p + 1, &q, 10); 1399 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1400 p = q + 1; 1401 pri = n; 1402 isprintf = 0; 1403 } 1404 } 1405 /* 1406 * Kernel printf's and LOG_CONSOLE messages have been displayed 1407 * on the console already. 1408 */ 1409 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1410 flags |= IGN_CONS; 1411 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1412 pri = DEFSPRI; 1413 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1414 } 1415 1416 static time_t now; 1417 1418 /* 1419 * Match a program or host name against a specification. 1420 * Return a non-0 value if the message must be ignored 1421 * based on the specification. 1422 */ 1423 static int 1424 skip_message(const char *name, const char *spec, int checkcase) 1425 { 1426 const char *s; 1427 char prev, next; 1428 int exclude = 0; 1429 /* Behaviour on explicit match */ 1430 1431 if (spec == NULL || *spec == '\0') 1432 return (0); 1433 switch (*spec) { 1434 case '-': 1435 exclude = 1; 1436 /*FALLTHROUGH*/ 1437 case '+': 1438 spec++; 1439 break; 1440 default: 1441 break; 1442 } 1443 if (checkcase) 1444 s = strstr (spec, name); 1445 else 1446 s = strcasestr (spec, name); 1447 1448 if (s != NULL) { 1449 prev = (s == spec ? ',' : *(s - 1)); 1450 next = *(s + strlen (name)); 1451 1452 if (prev == ',' && (next == '\0' || next == ',')) 1453 /* Explicit match: skip iff the spec is an 1454 exclusive one. */ 1455 return (exclude); 1456 } 1457 1458 /* No explicit match for this name: skip the message iff 1459 the spec is an inclusive one. */ 1460 return (!exclude); 1461 } 1462 1463 /* 1464 * Match some property of the message against a filter. 1465 * Return a non-0 value if the message must be ignored 1466 * based on the filter. 1467 */ 1468 static int 1469 evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1470 { 1471 const char *s = NULL; 1472 const int exclude = ((filter->cmp_flags & FILT_FLAG_EXCLUDE) > 0); 1473 size_t valuelen; 1474 1475 if (value == NULL) 1476 return (-1); 1477 1478 if (filter->cmp_type == FILT_CMP_REGEX) { 1479 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1480 return (exclude); 1481 else 1482 return (!exclude); 1483 } 1484 1485 valuelen = strlen(value); 1486 1487 /* a shortcut for equal with different length is always false */ 1488 if (filter->cmp_type == FILT_CMP_EQUAL && 1489 valuelen != strlen(filter->pflt_strval)) 1490 return (!exclude); 1491 1492 if (filter->cmp_flags & FILT_FLAG_ICASE) 1493 s = strcasestr(value, filter->pflt_strval); 1494 else 1495 s = strstr(value, filter->pflt_strval); 1496 1497 /* 1498 * FILT_CMP_CONTAINS true if s 1499 * FILT_CMP_STARTS true if s && s == value 1500 * FILT_CMP_EQUAL true if s && s == value && 1501 * valuelen == filter->pflt_strlen 1502 * (and length match is checked 1503 * already) 1504 */ 1505 1506 switch (filter->cmp_type) { 1507 case FILT_CMP_STARTS: 1508 case FILT_CMP_EQUAL: 1509 if (s != value) 1510 return (!exclude); 1511 /* FALLTHROUGH */ 1512 case FILT_CMP_CONTAINS: 1513 if (s) 1514 return (exclude); 1515 else 1516 return (!exclude); 1517 break; 1518 default: 1519 /* unknown cmp_type */ 1520 break; 1521 } 1522 1523 return (-1); 1524 } 1525 1526 /* 1527 * Logs a message to the appropriate log files, users, etc. based on the 1528 * priority. Log messages are formatted according to RFC 3164 or 1529 * RFC 5424 in subsequent fprintlog_*() functions. 1530 */ 1531 static void 1532 logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1533 const char *app_name, const char *procid, const char *msgid, 1534 const char *structured_data, const char *msg, int flags) 1535 { 1536 struct timeval tv; 1537 struct logtime timestamp_now; 1538 struct filed *f; 1539 size_t savedlen; 1540 int fac, prilev; 1541 char saved[MAXSVLINE], kernel_app_name[100]; 1542 1543 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1544 pri, flags, hostname, msg); 1545 1546 (void)gettimeofday(&tv, NULL); 1547 now = tv.tv_sec; 1548 if (timestamp == NULL) { 1549 localtime_r(&now, ×tamp_now.tm); 1550 timestamp_now.usec = tv.tv_usec; 1551 timestamp = ×tamp_now; 1552 } 1553 1554 /* extract facility and priority level */ 1555 if (flags & MARK) 1556 fac = LOG_NFACILITIES; 1557 else 1558 fac = LOG_FAC(pri); 1559 1560 /* Check maximum facility number. */ 1561 if (fac > LOG_NFACILITIES) 1562 return; 1563 1564 prilev = LOG_PRI(pri); 1565 1566 /* 1567 * Lookup kernel app name from log prefix if present. 1568 * This is only used for local program specification matching. 1569 */ 1570 if (flags & ISKERNEL) { 1571 size_t kernel_app_name_length; 1572 1573 parsemsg_rfc3164_get_app_name_procid(msg, 1574 &kernel_app_name_length, NULL, NULL); 1575 if (kernel_app_name_length != 0) { 1576 strlcpy(kernel_app_name, msg, 1577 MIN(sizeof(kernel_app_name), 1578 kernel_app_name_length + 1)); 1579 } else 1580 kernel_app_name[0] = '\0'; 1581 } 1582 1583 /* log the message to the particular outputs */ 1584 if (!Initialized) { 1585 consfile.f_lasttime = *timestamp; 1586 fprintlog_first(&consfile, hostname, app_name, procid, 1587 msgid, structured_data, msg, flags); 1588 return; 1589 } 1590 1591 /* 1592 * Store all of the fields of the message, except the timestamp, 1593 * in a single string. This string is used to detect duplicate 1594 * messages. 1595 */ 1596 assert(hostname != NULL); 1597 assert(msg != NULL); 1598 savedlen = snprintf(saved, sizeof(saved), 1599 "%d %s %s %s %s %s %s", pri, hostname, 1600 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1601 msgid == NULL ? "-" : msgid, 1602 structured_data == NULL ? "-" : structured_data, msg); 1603 1604 STAILQ_FOREACH(f, &fhead, next) { 1605 /* skip messages that are incorrect priority */ 1606 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1607 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1608 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1609 ) 1610 || f->f_pmask[fac] == INTERNAL_NOPRI) 1611 continue; 1612 1613 /* skip messages with the incorrect hostname */ 1614 if (skip_message(hostname, f->f_host, 0)) 1615 continue; 1616 1617 /* skip messages with the incorrect program name */ 1618 if (flags & ISKERNEL && kernel_app_name[0] != '\0') { 1619 if (skip_message(kernel_app_name, f->f_program, 1)) 1620 continue; 1621 } else if (skip_message(app_name == NULL ? "" : app_name, 1622 f->f_program, 1)) 1623 continue; 1624 1625 /* skip messages if a property does not match filter */ 1626 if (f->f_prop_filter != NULL && 1627 f->f_prop_filter->prop_type != FILT_PROP_NOOP) { 1628 switch (f->f_prop_filter->prop_type) { 1629 case FILT_PROP_MSG: 1630 if (evaluate_prop_filter(f->f_prop_filter, 1631 msg)) 1632 continue; 1633 break; 1634 case FILT_PROP_HOSTNAME: 1635 if (evaluate_prop_filter(f->f_prop_filter, 1636 hostname)) 1637 continue; 1638 break; 1639 case FILT_PROP_PROGNAME: 1640 if (evaluate_prop_filter(f->f_prop_filter, 1641 app_name == NULL ? "" : app_name)) 1642 continue; 1643 break; 1644 default: 1645 continue; 1646 } 1647 } 1648 1649 /* skip message to console if it has already been printed */ 1650 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1651 continue; 1652 1653 /* don't output marks to recently written files */ 1654 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1655 continue; 1656 1657 /* 1658 * suppress duplicate lines to this file 1659 */ 1660 if (no_compress - (f->f_type != F_PIPE) < 1 && 1661 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1662 strcmp(saved, f->f_prevline) == 0) { 1663 f->f_lasttime = *timestamp; 1664 f->f_prevcount++; 1665 dprintf("msg repeated %d times, %ld sec of %d\n", 1666 f->f_prevcount, (long)(now - f->f_time), 1667 repeatinterval[f->f_repeatcount]); 1668 /* 1669 * If domark would have logged this by now, 1670 * flush it now (so we don't hold isolated messages), 1671 * but back off so we'll flush less often 1672 * in the future. 1673 */ 1674 if (now > REPEATTIME(f)) { 1675 fprintlog_successive(f, flags); 1676 BACKOFF(f); 1677 } 1678 } else { 1679 /* new line, save it */ 1680 if (f->f_prevcount) 1681 fprintlog_successive(f, 0); 1682 f->f_repeatcount = 0; 1683 f->f_prevpri = pri; 1684 f->f_lasttime = *timestamp; 1685 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1686 "Space to store saved line incorrect"); 1687 (void)strcpy(f->f_prevline, saved); 1688 f->f_prevlen = savedlen; 1689 fprintlog_first(f, hostname, app_name, procid, msgid, 1690 structured_data, msg, flags); 1691 } 1692 } 1693 } 1694 1695 static void 1696 dofsync(void) 1697 { 1698 struct filed *f; 1699 1700 STAILQ_FOREACH(f, &fhead, next) { 1701 if (f->f_type == F_FILE && 1702 (f->f_flags & FFLAG_NEEDSYNC) != 0) { 1703 f->f_flags &= ~FFLAG_NEEDSYNC; 1704 (void)fsync(f->f_file); 1705 } 1706 } 1707 needdofsync = false; 1708 } 1709 1710 static void 1711 iovlist_init(struct iovlist *il) 1712 { 1713 1714 il->iovcnt = 0; 1715 il->totalsize = 0; 1716 } 1717 1718 static void 1719 iovlist_append(struct iovlist *il, const char *str) 1720 { 1721 size_t size; 1722 1723 /* Discard components if we've run out of iovecs. */ 1724 if (il->iovcnt < nitems(il->iov)) { 1725 size = strlen(str); 1726 il->iov[il->iovcnt++] = (struct iovec){ 1727 .iov_base = __DECONST(char *, str), 1728 .iov_len = size, 1729 }; 1730 il->totalsize += size; 1731 } 1732 } 1733 1734 #if defined(INET) || defined(INET6) 1735 static void 1736 iovlist_truncate(struct iovlist *il, size_t size) 1737 { 1738 struct iovec *last; 1739 size_t diff; 1740 1741 while (il->totalsize > size) { 1742 diff = il->totalsize - size; 1743 last = &il->iov[il->iovcnt - 1]; 1744 if (diff >= last->iov_len) { 1745 /* Remove the last iovec entirely. */ 1746 --il->iovcnt; 1747 il->totalsize -= last->iov_len; 1748 } else { 1749 /* Remove the last iovec partially. */ 1750 last->iov_len -= diff; 1751 il->totalsize -= diff; 1752 } 1753 } 1754 } 1755 #endif 1756 1757 static void 1758 fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1759 { 1760 const char *msgret; 1761 1762 switch (f->f_type) { 1763 case F_FORW: { 1764 ssize_t lsent; 1765 1766 if (Debug) { 1767 int domain, sockfd = f->f_addr_fds[0]; 1768 socklen_t len = sizeof(domain); 1769 1770 if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN, 1771 &domain, &len) < 0) 1772 err(1, "getsockopt"); 1773 1774 printf(" %s", f->f_hname); 1775 switch (domain) { 1776 #ifdef INET 1777 case AF_INET: { 1778 struct sockaddr_in sin; 1779 1780 len = sizeof(sin); 1781 if (getpeername(sockfd, 1782 (struct sockaddr *)&sin, &len) < 0) 1783 err(1, "getpeername"); 1784 printf(":%d\n", ntohs(sin.sin_port)); 1785 break; 1786 } 1787 #endif 1788 #ifdef INET6 1789 case AF_INET6: { 1790 struct sockaddr_in6 sin6; 1791 1792 len = sizeof(sin6); 1793 if (getpeername(sockfd, 1794 (struct sockaddr *)&sin6, &len) < 0) 1795 err(1, "getpeername"); 1796 printf(":%d\n", ntohs(sin6.sin6_port)); 1797 break; 1798 } 1799 #endif 1800 default: 1801 printf("\n"); 1802 } 1803 } 1804 1805 #if defined(INET) || defined(INET6) 1806 /* Truncate messages to maximum forward length. */ 1807 iovlist_truncate(il, MaxForwardLen); 1808 #endif 1809 1810 lsent = 0; 1811 for (size_t i = 0; i < f->f_num_addr_fds; ++i) { 1812 struct msghdr msg = { 1813 .msg_iov = il->iov, 1814 .msg_iovlen = il->iovcnt, 1815 }; 1816 1817 lsent = sendmsg(f->f_addr_fds[i], &msg, 0); 1818 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1819 break; 1820 } 1821 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1822 if (lsent != (ssize_t)il->totalsize) { 1823 int e = errno; 1824 logerror("sendto"); 1825 errno = e; 1826 switch (errno) { 1827 case ENOBUFS: 1828 case ENETDOWN: 1829 case ENETUNREACH: 1830 case EHOSTUNREACH: 1831 case EHOSTDOWN: 1832 case EADDRNOTAVAIL: 1833 case EAGAIN: 1834 case ECONNREFUSED: 1835 break; 1836 /* case EBADF: */ 1837 /* case EACCES: */ 1838 /* case ENOTSOCK: */ 1839 /* case EFAULT: */ 1840 /* case EMSGSIZE: */ 1841 default: 1842 dprintf("removing entry: errno=%d\n", e); 1843 f->f_type = F_UNUSED; 1844 break; 1845 } 1846 } 1847 break; 1848 } 1849 1850 case F_FILE: 1851 dprintf(" %s\n", f->f_fname); 1852 iovlist_append(il, "\n"); 1853 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1854 /* 1855 * If writev(2) fails for potentially transient errors 1856 * like the filesystem being full, ignore it. 1857 * Otherwise remove this logfile from the list. 1858 */ 1859 if (errno != ENOSPC) { 1860 int e = errno; 1861 close_filed(f); 1862 errno = e; 1863 logerror(f->f_fname); 1864 } 1865 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1866 f->f_flags |= FFLAG_NEEDSYNC; 1867 needdofsync = true; 1868 } 1869 break; 1870 1871 case F_PIPE: 1872 dprintf(" %s\n", f->f_pname); 1873 iovlist_append(il, "\n"); 1874 if (f->f_procdesc == -1) { 1875 struct kevent ev; 1876 struct filed *f_in_list; 1877 size_t i = 0; 1878 1879 STAILQ_FOREACH(f_in_list, &fhead, next) { 1880 if (f_in_list == f) 1881 break; 1882 ++i; 1883 } 1884 f->f_file = cap_p_open(cap_syslogd, i, f->f_pname, 1885 &f->f_procdesc); 1886 if (f->f_file < 0) { 1887 logerror(f->f_pname); 1888 break; 1889 } 1890 EV_SET(&ev, f->f_procdesc, EVFILT_PROCDESC, EV_ADD, 1891 NOTE_EXIT, 0, f); 1892 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 1893 logerror("failed to add procdesc kevent"); 1894 exit(1); 1895 } 1896 } 1897 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1898 logerror(f->f_pname); 1899 f->f_dq = deadq_enter(f->f_procdesc); 1900 } 1901 break; 1902 1903 case F_CONSOLE: 1904 if (flags & IGN_CONS) { 1905 dprintf(" (ignored)\n"); 1906 break; 1907 } 1908 /* FALLTHROUGH */ 1909 1910 case F_TTY: 1911 dprintf(" %s%s\n", _PATH_DEV, f->f_fname); 1912 iovlist_append(il, "\r\n"); 1913 errno = 0; /* ttymsg() only sometimes returns an errno */ 1914 if ((msgret = cap_ttymsg(cap_syslogd, il->iov, il->iovcnt, 1915 f->f_fname, 10))) { 1916 f->f_type = F_UNUSED; 1917 logerror(msgret); 1918 } 1919 break; 1920 1921 case F_USERS: 1922 case F_WALL: 1923 dprintf("\n"); 1924 iovlist_append(il, "\r\n"); 1925 cap_wallmsg(cap_syslogd, f, il->iov, il->iovcnt); 1926 break; 1927 default: 1928 break; 1929 } 1930 } 1931 1932 static void 1933 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1934 const char *procid, const char *msgid, const char *structured_data, 1935 const char *msg, int flags) 1936 { 1937 struct iovlist il; 1938 suseconds_t usec; 1939 int i; 1940 char timebuf[33], priority_number[5]; 1941 1942 iovlist_init(&il); 1943 if (f->f_type == F_WALL) 1944 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 1945 iovlist_append(&il, "<"); 1946 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 1947 iovlist_append(&il, priority_number); 1948 iovlist_append(&il, ">1 "); 1949 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 1950 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 1951 /* Add colon to the time zone offset, which %z doesn't do. */ 1952 timebuf[32] = '\0'; 1953 timebuf[31] = timebuf[30]; 1954 timebuf[30] = timebuf[29]; 1955 timebuf[29] = ':'; 1956 1957 /* Overwrite space for microseconds with actual value. */ 1958 usec = f->f_lasttime.usec; 1959 for (i = 25; i >= 20; --i) { 1960 timebuf[i] = usec % 10 + '0'; 1961 usec /= 10; 1962 } 1963 iovlist_append(&il, timebuf); 1964 } else 1965 iovlist_append(&il, "-"); 1966 iovlist_append(&il, " "); 1967 iovlist_append(&il, hostname); 1968 iovlist_append(&il, " "); 1969 iovlist_append(&il, app_name == NULL ? "-" : app_name); 1970 iovlist_append(&il, " "); 1971 iovlist_append(&il, procid == NULL ? "-" : procid); 1972 iovlist_append(&il, " "); 1973 iovlist_append(&il, msgid == NULL ? "-" : msgid); 1974 iovlist_append(&il, " "); 1975 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 1976 iovlist_append(&il, " "); 1977 iovlist_append(&il, msg); 1978 1979 fprintlog_write(f, &il, flags); 1980 } 1981 1982 static void 1983 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 1984 const char *procid, const char *msg, int flags) 1985 { 1986 struct iovlist il; 1987 const CODE *c; 1988 int facility, priority; 1989 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 1990 priority_number[5]; 1991 bool facility_found, priority_found; 1992 1993 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 1994 &f->f_lasttime.tm) == 0) 1995 timebuf[0] = '\0'; 1996 1997 iovlist_init(&il); 1998 switch (f->f_type) { 1999 case F_FORW: 2000 /* Message forwarded over the network. */ 2001 iovlist_append(&il, "<"); 2002 snprintf(priority_number, sizeof(priority_number), "%d", 2003 f->f_prevpri); 2004 iovlist_append(&il, priority_number); 2005 iovlist_append(&il, ">"); 2006 iovlist_append(&il, timebuf); 2007 if (output_format == FORMAT_RFC3164_STRICT) { 2008 iovlist_append(&il, " "); 2009 iovlist_append(&il, hostname); 2010 } else if (strcasecmp(hostname, LocalHostName) != 0) { 2011 iovlist_append(&il, " Forwarded from "); 2012 iovlist_append(&il, hostname); 2013 iovlist_append(&il, ":"); 2014 } 2015 iovlist_append(&il, " "); 2016 break; 2017 2018 case F_WALL: 2019 /* Message written to terminals. */ 2020 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 2021 iovlist_append(&il, hostname); 2022 iovlist_append(&il, " at "); 2023 iovlist_append(&il, timebuf); 2024 iovlist_append(&il, " ...\r\n"); 2025 break; 2026 2027 default: 2028 /* Message written to files. */ 2029 iovlist_append(&il, timebuf); 2030 iovlist_append(&il, " "); 2031 2032 if (LogFacPri) { 2033 iovlist_append(&il, "<"); 2034 2035 facility = f->f_prevpri & LOG_FACMASK; 2036 facility_found = false; 2037 if (LogFacPri > 1) { 2038 for (c = facilitynames; c->c_name; c++) { 2039 if (c->c_val == facility) { 2040 iovlist_append(&il, c->c_name); 2041 facility_found = true; 2042 break; 2043 } 2044 } 2045 } 2046 if (!facility_found) { 2047 snprintf(facility_number, 2048 sizeof(facility_number), "%d", 2049 LOG_FAC(facility)); 2050 iovlist_append(&il, facility_number); 2051 } 2052 2053 iovlist_append(&il, "."); 2054 2055 priority = LOG_PRI(f->f_prevpri); 2056 priority_found = false; 2057 if (LogFacPri > 1) { 2058 for (c = prioritynames; c->c_name; c++) { 2059 if (c->c_val == priority) { 2060 iovlist_append(&il, c->c_name); 2061 priority_found = true; 2062 break; 2063 } 2064 } 2065 } 2066 if (!priority_found) { 2067 snprintf(priority_number, 2068 sizeof(priority_number), "%d", priority); 2069 iovlist_append(&il, priority_number); 2070 } 2071 2072 iovlist_append(&il, "> "); 2073 } 2074 2075 iovlist_append(&il, hostname); 2076 iovlist_append(&il, " "); 2077 break; 2078 } 2079 2080 /* Message body with application name and process ID prefixed. */ 2081 if (app_name != NULL) { 2082 iovlist_append(&il, app_name); 2083 if (procid != NULL) { 2084 iovlist_append(&il, "["); 2085 iovlist_append(&il, procid); 2086 iovlist_append(&il, "]"); 2087 } 2088 iovlist_append(&il, ": "); 2089 } 2090 iovlist_append(&il, msg); 2091 2092 fprintlog_write(f, &il, flags); 2093 } 2094 2095 static void 2096 fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2097 const char *procid, const char *msgid __unused, 2098 const char *structured_data __unused, const char *msg, int flags) 2099 { 2100 2101 dprintf("Logging to %s", TypeNames[f->f_type]); 2102 f->f_time = now; 2103 f->f_prevcount = 0; 2104 if (f->f_type == F_UNUSED) { 2105 dprintf("\n"); 2106 return; 2107 } 2108 2109 if (IS_RFC3164_FORMAT) 2110 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2111 else 2112 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2113 structured_data, msg, flags); 2114 } 2115 2116 /* 2117 * Prints a message to a log file that the previously logged message was 2118 * received multiple times. 2119 */ 2120 static void 2121 fprintlog_successive(struct filed *f, int flags) 2122 { 2123 char msg[100]; 2124 2125 assert(f->f_prevcount > 0); 2126 snprintf(msg, sizeof(msg), "last message repeated %d times", 2127 f->f_prevcount); 2128 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2129 flags); 2130 } 2131 2132 /* 2133 * WALLMSG -- Write a message to the world at large 2134 * 2135 * Write the specified message to either the entire 2136 * world, or a list of approved users. 2137 * 2138 * Note: This function is wrapped by cap_wallmsg() when Capsicum support is 2139 * enabled so ttymsg() can be called. 2140 */ 2141 void 2142 wallmsg(const struct filed *f, struct iovec *iov, const int iovlen) 2143 { 2144 static int reenter; /* avoid calling ourselves */ 2145 struct utmpx *ut; 2146 int i; 2147 const char *p; 2148 2149 if (reenter++) 2150 return; 2151 setutxent(); 2152 /* NOSTRICT */ 2153 while ((ut = getutxent()) != NULL) { 2154 if (ut->ut_type != USER_PROCESS) 2155 continue; 2156 if (f->f_type == F_WALL) { 2157 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2158 TTYMSGTIME)) != NULL) 2159 dprintf("%s\n", p); 2160 continue; 2161 } 2162 /* should we send the message to this user? */ 2163 for (i = 0; i < MAXUNAMES; i++) { 2164 if (!f->f_uname[i][0]) 2165 break; 2166 if (!strcmp(f->f_uname[i], ut->ut_user)) { 2167 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2168 TTYMSGTIME)) != NULL) 2169 dprintf("%s\n", p); 2170 break; 2171 } 2172 } 2173 } 2174 endutxent(); 2175 reenter = 0; 2176 } 2177 2178 /* 2179 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2180 */ 2181 static const char * 2182 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2183 { 2184 static char device[1024]; 2185 static char errbuf[1024]; 2186 struct stat sb; 2187 2188 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2189 2190 if (stat(device, &sb) < 0) { 2191 (void) snprintf(errbuf, sizeof(errbuf), 2192 "%s: %s", device, strerror(errno)); 2193 return (errbuf); 2194 } 2195 if ((sb.st_mode & S_IWGRP) == 0) 2196 /* Messages disabled. */ 2197 return (NULL); 2198 return (ttymsg(iov, iovcnt, line, tmout)); 2199 } 2200 2201 /* 2202 * Return a printable representation of a host address. 2203 */ 2204 static const char * 2205 cvthname(struct sockaddr *f) 2206 { 2207 int error, hl; 2208 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2209 2210 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2211 error = cap_getnameinfo(cap_net, f, f->sa_len, ip, sizeof(ip), NULL, 0, 2212 NI_NUMERICHOST); 2213 if (error) { 2214 dprintf("Malformed from address %s\n", gai_strerror(error)); 2215 return ("???"); 2216 } 2217 dprintf("cvthname(%s)\n", ip); 2218 2219 if (!resolve) 2220 return (ip); 2221 2222 error = cap_getnameinfo(cap_net, f, f->sa_len, hname, sizeof(hname), 2223 NULL, 0, NI_NAMEREQD); 2224 if (error) { 2225 dprintf("Host name for your address (%s) unknown\n", ip); 2226 return (ip); 2227 } 2228 hl = strlen(hname); 2229 if (hl > 0 && hname[hl-1] == '.') 2230 hname[--hl] = '\0'; 2231 /* RFC 5424 prefers logging FQDNs. */ 2232 if (IS_RFC3164_FORMAT) 2233 trimdomain(hname, hl); 2234 return (hname); 2235 } 2236 2237 /* 2238 * Print syslogd errors some place. 2239 */ 2240 void 2241 logerror(const char *msg) 2242 { 2243 char buf[512]; 2244 static int recursed = 0; 2245 2246 /* If there's an error while trying to log an error, give up. */ 2247 if (recursed) 2248 return; 2249 recursed++; 2250 if (errno != 0) { 2251 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2252 strerror(errno)); 2253 msg = buf; 2254 } 2255 errno = 0; 2256 dprintf("%s\n", msg); 2257 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2258 NULL, msg, 0); 2259 recursed--; 2260 } 2261 2262 static void 2263 die(int signo) 2264 { 2265 struct filed *f; 2266 struct socklist *sl; 2267 char buf[100]; 2268 2269 STAILQ_FOREACH(f, &fhead, next) { 2270 /* flush any pending output */ 2271 if (f->f_prevcount) 2272 fprintlog_successive(f, 0); 2273 /* terminate existing pipe processes */ 2274 if (f->f_type == F_PIPE) 2275 close_filed(f); 2276 } 2277 if (signo) { 2278 dprintf("syslogd: exiting on signal %d\n", signo); 2279 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2280 errno = 0; 2281 logerror(buf); 2282 } 2283 STAILQ_FOREACH(sl, &shead, next) { 2284 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) { 2285 if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) { 2286 dprintf("Failed to unlink %s: %s", sl->sl_name, 2287 strerror(errno)); 2288 } 2289 } 2290 } 2291 pidfile_remove(pfh); 2292 2293 exit(1); 2294 } 2295 2296 static int 2297 configfiles(const struct dirent *dp) 2298 { 2299 const char *p; 2300 size_t ext_len; 2301 2302 if (dp->d_name[0] == '.') 2303 return (0); 2304 2305 ext_len = sizeof(include_ext) -1; 2306 2307 if (dp->d_namlen <= ext_len) 2308 return (0); 2309 2310 p = &dp->d_name[dp->d_namlen - ext_len]; 2311 if (strcmp(p, include_ext) != 0) 2312 return (0); 2313 2314 return (1); 2315 } 2316 2317 static nvlist_t * 2318 parseconfigfile(FILE *cf, bool allow_includes, nvlist_t *nvl_conf) 2319 { 2320 FILE *cf2; 2321 struct dirent **ent; 2322 char cline[LINE_MAX]; 2323 char host[MAXHOSTNAMELEN]; 2324 char prog[LINE_MAX]; 2325 char file[MAXPATHLEN]; 2326 char pfilter[LINE_MAX]; 2327 char *p, *tmp; 2328 int i, nents; 2329 size_t include_len; 2330 2331 /* 2332 * Foreach line in the conf table, open that file. 2333 */ 2334 include_len = sizeof(include_str) - 1; 2335 (void)strlcpy(host, "*", sizeof(host)); 2336 (void)strlcpy(prog, "*", sizeof(prog)); 2337 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2338 while (fgets(cline, sizeof(cline), cf) != NULL) { 2339 /* 2340 * check for end-of-section, comments, strip off trailing 2341 * spaces and newline character. #!prog is treated specially: 2342 * following lines apply only to that program. 2343 */ 2344 for (p = cline; isspace(*p); ++p) 2345 continue; 2346 if (*p == '\0') 2347 continue; 2348 if (allow_includes && 2349 strncmp(p, include_str, include_len) == 0 && 2350 isspace(p[include_len])) { 2351 p += include_len; 2352 while (isspace(*p)) 2353 p++; 2354 tmp = p; 2355 while (*tmp != '\0' && !isspace(*tmp)) 2356 tmp++; 2357 *tmp = '\0'; 2358 dprintf("Trying to include files in '%s'\n", p); 2359 nents = scandir(p, &ent, configfiles, alphasort); 2360 if (nents == -1) { 2361 dprintf("Unable to open '%s': %s\n", p, 2362 strerror(errno)); 2363 continue; 2364 } 2365 for (i = 0; i < nents; i++) { 2366 if (snprintf(file, sizeof(file), "%s/%s", p, 2367 ent[i]->d_name) >= (int)sizeof(file)) { 2368 dprintf("ignoring path too long: " 2369 "'%s/%s'\n", p, ent[i]->d_name); 2370 free(ent[i]); 2371 continue; 2372 } 2373 free(ent[i]); 2374 cf2 = fopen(file, "r"); 2375 if (cf2 == NULL) 2376 continue; 2377 dprintf("reading %s\n", file); 2378 parseconfigfile(cf2, false, nvl_conf); 2379 fclose(cf2); 2380 } 2381 free(ent); 2382 continue; 2383 } 2384 if (*p == '#') { 2385 p++; 2386 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2387 continue; 2388 } 2389 if (*p == '+' || *p == '-') { 2390 host[0] = *p++; 2391 while (isspace(*p)) 2392 p++; 2393 if (*p == '\0' || *p == '*') { 2394 (void)strlcpy(host, "*", sizeof(host)); 2395 continue; 2396 } 2397 if (*p == '@') 2398 p = LocalHostName; 2399 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2400 if (!isalnum(*p) && *p != '.' && *p != '-' 2401 && *p != ',' && *p != ':' && *p != '%') 2402 break; 2403 host[i] = *p++; 2404 } 2405 host[i] = '\0'; 2406 continue; 2407 } 2408 if (*p == '!') { 2409 p++; 2410 while (isspace(*p)) 2411 p++; 2412 if (*p == '\0' || *p == '*') { 2413 (void)strlcpy(prog, "*", sizeof(prog)); 2414 continue; 2415 } 2416 for (i = 0; i < LINE_MAX - 1; i++) { 2417 if (!isprint(p[i]) || isspace(p[i])) 2418 break; 2419 prog[i] = p[i]; 2420 } 2421 prog[i] = '\0'; 2422 continue; 2423 } 2424 if (*p == ':') { 2425 p++; 2426 while (isspace(*p)) 2427 p++; 2428 if (*p == '\0' || *p == '*') { 2429 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2430 continue; 2431 } 2432 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2433 continue; 2434 } 2435 for (p = cline + 1; *p != '\0'; p++) { 2436 if (*p != '#') 2437 continue; 2438 if (*(p - 1) == '\\') { 2439 strcpy(p - 1, p); 2440 p--; 2441 continue; 2442 } 2443 *p = '\0'; 2444 break; 2445 } 2446 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2447 cline[i] = '\0'; 2448 cfline(nvl_conf, cline, prog, host, pfilter); 2449 2450 } 2451 return (nvl_conf); 2452 } 2453 2454 /* 2455 * Read configuration file and create filed entries for each line. 2456 * 2457 * Note: This function is wrapped by cap_readconfigfile() when Capsicum 2458 * support is enabled so resources can be acquired outside of the security 2459 * sandbox. 2460 */ 2461 nvlist_t * 2462 readconfigfile(const char *path) 2463 { 2464 FILE *cf; 2465 nvlist_t *nvl_conf = nvlist_create(0); 2466 2467 if ((cf = fopen(path, "r")) != NULL) { 2468 nvl_conf = parseconfigfile(cf, true, nvl_conf); 2469 (void)fclose(cf); 2470 } else { 2471 dprintf("cannot open %s\n", path); 2472 cfline(nvl_conf, "*.ERR\t/dev/console", "*", "*", "*"); 2473 cfline(nvl_conf, "*.PANIC\t*", "*", "*", "*"); 2474 } 2475 return (nvl_conf); 2476 } 2477 2478 static void 2479 fill_flist(nvlist_t *nvl_conf) 2480 { 2481 const nvlist_t * const *filed_list; 2482 size_t nfileds; 2483 2484 if (!nvlist_exists_nvlist_array(nvl_conf, "filed_list")) 2485 return; 2486 filed_list = nvlist_get_nvlist_array(nvl_conf, "filed_list", 2487 &nfileds); 2488 for (size_t i = 0; i < nfileds; ++i) { 2489 struct filed *f; 2490 2491 f = nvlist_to_filed(filed_list[i]); 2492 STAILQ_INSERT_TAIL(&fhead, f, next); 2493 } 2494 nvlist_destroy(nvl_conf); 2495 } 2496 2497 /* 2498 * Close all open log files. 2499 */ 2500 void 2501 closelogfiles(void) 2502 { 2503 struct filed *f; 2504 2505 while (!STAILQ_EMPTY(&fhead)) { 2506 f = STAILQ_FIRST(&fhead); 2507 STAILQ_REMOVE_HEAD(&fhead, next); 2508 2509 /* flush any pending output */ 2510 if (f->f_prevcount) 2511 fprintlog_successive(f, 0); 2512 2513 switch (f->f_type) { 2514 case F_FILE: 2515 case F_FORW: 2516 case F_CONSOLE: 2517 case F_TTY: 2518 close_filed(f); 2519 break; 2520 case F_PIPE: 2521 if (f->f_procdesc != -1) { 2522 struct kevent ev; 2523 /* 2524 * This filed is going to be freed. 2525 * Delete procdesc kevents that reference it. 2526 */ 2527 EV_SET(&ev, f->f_procdesc, EVFILT_PROCDESC, 2528 EV_DELETE, NOTE_EXIT, 0, f); 2529 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 2530 logerror("failed to delete procdesc" 2531 "kevent"); 2532 exit(1); 2533 } 2534 } 2535 close_filed(f); 2536 break; 2537 default: 2538 break; 2539 } 2540 2541 if (f->f_prop_filter) { 2542 switch (f->f_prop_filter->cmp_type) { 2543 case FILT_CMP_REGEX: 2544 regfree(f->f_prop_filter->pflt_re); 2545 free(f->f_prop_filter->pflt_re); 2546 /* FALLTHROUGH */ 2547 case FILT_CMP_CONTAINS: 2548 case FILT_CMP_EQUAL: 2549 case FILT_CMP_STARTS: 2550 free(f->f_prop_filter->pflt_strval); 2551 break; 2552 } 2553 free(f->f_prop_filter); 2554 } 2555 free(f); 2556 } 2557 } 2558 2559 static void 2560 syslogd_cap_enter(void) 2561 { 2562 #ifdef WITH_CASPER 2563 cap_channel_t *cap_casper; 2564 cap_net_limit_t *limit; 2565 2566 cap_casper = cap_init(); 2567 if (cap_casper == NULL) 2568 err(1, "Failed to communicate with libcasper"); 2569 cap_syslogd = cap_service_open(cap_casper, "syslogd.casper"); 2570 if (cap_syslogd == NULL) 2571 err(1, "Failed to open the syslogd.casper libcasper service"); 2572 cap_net = cap_service_open(cap_casper, "system.net"); 2573 if (cap_net == NULL) 2574 err(1, "Failed to open the system.net libcasper service"); 2575 cap_close(cap_casper); 2576 limit = cap_net_limit_init(cap_net, 2577 CAPNET_ADDR2NAME | CAPNET_NAME2ADDR); 2578 if (limit == NULL) 2579 err(1, "Failed to create system.net limits"); 2580 if (cap_net_limit(limit) == -1) 2581 err(1, "Failed to apply system.net limits"); 2582 caph_cache_tzdata(); 2583 caph_cache_catpages(); 2584 if (caph_enter_casper() == -1) 2585 err(1, "Failed to enter capability mode"); 2586 #endif 2587 } 2588 2589 /* 2590 * INIT -- Initialize syslogd from configuration table 2591 */ 2592 static void 2593 init(bool reload) 2594 { 2595 int i; 2596 char *p; 2597 char oldLocalHostName[MAXHOSTNAMELEN]; 2598 char hostMsg[2*MAXHOSTNAMELEN+40]; 2599 char bootfileMsg[MAXLINE + 1]; 2600 2601 dprintf("init\n"); 2602 2603 /* 2604 * Load hostname (may have changed). 2605 */ 2606 if (reload) 2607 (void)strlcpy(oldLocalHostName, LocalHostName, 2608 sizeof(oldLocalHostName)); 2609 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2610 err(EX_OSERR, "gethostname() failed"); 2611 if ((p = strchr(LocalHostName, '.')) != NULL) { 2612 /* RFC 5424 prefers logging FQDNs. */ 2613 if (IS_RFC3164_FORMAT) 2614 *p = '\0'; 2615 LocalDomain = p + 1; 2616 } else { 2617 LocalDomain = ""; 2618 } 2619 2620 #ifndef WITH_CASPER 2621 /* 2622 * XXX: Disable when running in capability mode, for now. 2623 * This requires a new interface in the tzcode module to 2624 * get running without capability violations. 2625 * 2626 * Load / reload timezone data (in case it changed). 2627 * 2628 * Just calling tzset() again does not work, the timezone code 2629 * caches the result. However, by setting the TZ variable, one 2630 * can defeat the caching and have the timezone code really 2631 * reload the timezone data. Respect any initial setting of 2632 * TZ, in case the system is configured specially. 2633 */ 2634 dprintf("loading timezone data via tzset()\n"); 2635 if (getenv("TZ")) { 2636 tzset(); 2637 } else { 2638 setenv("TZ", ":/etc/localtime", 1); 2639 tzset(); 2640 unsetenv("TZ"); 2641 } 2642 #endif 2643 2644 if (!reload) { 2645 struct tm tm; 2646 /* Cache time files before entering capability mode. */ 2647 timegm(&tm); 2648 syslogd_cap_enter(); 2649 } 2650 2651 Initialized = false; 2652 closelogfiles(); 2653 fill_flist(cap_readconfigfile(cap_syslogd, ConfFile)); 2654 Initialized = true; 2655 2656 if (Debug) { 2657 struct filed *f; 2658 int port; 2659 2660 STAILQ_FOREACH(f, &fhead, next) { 2661 for (i = 0; i <= LOG_NFACILITIES; i++) 2662 if (f->f_pmask[i] == INTERNAL_NOPRI) 2663 printf("X "); 2664 else 2665 printf("%d ", f->f_pmask[i]); 2666 printf("%s: ", TypeNames[f->f_type]); 2667 switch (f->f_type) { 2668 case F_FILE: 2669 printf("%s", f->f_fname); 2670 break; 2671 2672 case F_CONSOLE: 2673 case F_TTY: 2674 printf("%s%s", _PATH_DEV, f->f_fname); 2675 break; 2676 2677 case F_FORW: { 2678 int domain, sockfd = f->f_addr_fds[0]; 2679 socklen_t len = sizeof(domain); 2680 2681 if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN, 2682 &domain, &len) < 0) 2683 err(1, "getsockopt"); 2684 2685 switch (domain) { 2686 #ifdef INET 2687 case AF_INET: { 2688 struct sockaddr_in sin; 2689 2690 len = sizeof(sin); 2691 if (getpeername(sockfd, (struct sockaddr *)&sin, &len) < 0) 2692 err(1, "getpeername"); 2693 port = ntohs(sin.sin_port); 2694 break; 2695 } 2696 #endif 2697 #ifdef INET6 2698 case AF_INET6: { 2699 struct sockaddr_in6 sin6; 2700 2701 len = sizeof(sin6); 2702 if (getpeername(sockfd, (struct sockaddr *)&sin6, &len) < 0) 2703 err(1, "getpeername"); 2704 port = ntohs(sin6.sin6_port); 2705 break; 2706 } 2707 #endif 2708 default: 2709 port = 0; 2710 } 2711 if (port != 514) { 2712 printf("%s:%d", f->f_hname, port); 2713 } else { 2714 printf("%s", f->f_hname); 2715 } 2716 break; 2717 } 2718 2719 case F_PIPE: 2720 printf("%s", f->f_pname); 2721 break; 2722 2723 case F_USERS: 2724 for (i = 0; i < MAXUNAMES && *f->f_uname[i]; i++) 2725 printf("%s, ", f->f_uname[i]); 2726 break; 2727 default: 2728 break; 2729 } 2730 if (*f->f_program != '\0') 2731 printf(" (%s)", f->f_program); 2732 printf("\n"); 2733 } 2734 } 2735 2736 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2737 NULL, NULL, "restart", 0); 2738 dprintf("syslogd: restarted\n"); 2739 /* 2740 * Log a change in hostname, but only on reload. 2741 */ 2742 if (reload && strcmp(oldLocalHostName, LocalHostName) != 0) { 2743 (void)snprintf(hostMsg, sizeof(hostMsg), 2744 "hostname changed, \"%s\" to \"%s\"", 2745 oldLocalHostName, LocalHostName); 2746 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2747 NULL, NULL, NULL, hostMsg, 0); 2748 dprintf("%s\n", hostMsg); 2749 } 2750 /* 2751 * Log the kernel boot file if we aren't going to use it as 2752 * the prefix, and if this is *not* a reload. 2753 */ 2754 if (!reload && !use_bootfile) { 2755 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2756 "kernel boot file is %s", bootfile); 2757 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2758 NULL, NULL, NULL, bootfileMsg, 0); 2759 dprintf("%s\n", bootfileMsg); 2760 } 2761 } 2762 2763 /* 2764 * Compile property-based filter. 2765 */ 2766 static nvlist_t * 2767 prop_filter_compile(const char *cfilter) 2768 { 2769 nvlist_t *nvl_pfilter; 2770 struct prop_filter pfilter = { }; 2771 char *filter, *filter_endpos, *filter_begpos, *p; 2772 char **ap, *argv[2] = {NULL, NULL}; 2773 int escaped; 2774 2775 filter = strdup(cfilter); 2776 if (filter == NULL) 2777 err(1, "strdup"); 2778 filter_begpos = filter; 2779 2780 /* 2781 * Here's some filter examples mentioned in syslog.conf(5) 2782 * 'msg, contains, ".*Deny.*"' 2783 * 'programname, regex, "^bird6?$"' 2784 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2785 */ 2786 2787 /* 2788 * Split filter into 3 parts: property name (argv[0]), 2789 * cmp type (argv[1]) and lvalue for comparison (filter). 2790 */ 2791 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2792 if (**ap != '\0') 2793 if (++ap >= &argv[2]) 2794 break; 2795 } 2796 2797 if (argv[0] == NULL || argv[1] == NULL) { 2798 dprintf("filter parse error"); 2799 goto error; 2800 } 2801 2802 /* fill in prop_type */ 2803 if (strcasecmp(argv[0], "msg") == 0) 2804 pfilter.prop_type = FILT_PROP_MSG; 2805 else if (strcasecmp(argv[0], "hostname") == 0) 2806 pfilter.prop_type = FILT_PROP_HOSTNAME; 2807 else if (strcasecmp(argv[0], "source") == 0) 2808 pfilter.prop_type = FILT_PROP_HOSTNAME; 2809 else if (strcasecmp(argv[0], "programname") == 0) 2810 pfilter.prop_type = FILT_PROP_PROGNAME; 2811 else { 2812 dprintf("unknown property"); 2813 goto error; 2814 } 2815 2816 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2817 if (*argv[1] == '!') { 2818 pfilter.cmp_flags |= FILT_FLAG_EXCLUDE; 2819 argv[1]++; 2820 } 2821 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2822 pfilter.cmp_flags |= FILT_FLAG_ICASE; 2823 argv[1] += sizeof("icase_") - 1; 2824 } 2825 2826 /* fill in cmp_type */ 2827 if (strcasecmp(argv[1], "contains") == 0) 2828 pfilter.cmp_type = FILT_CMP_CONTAINS; 2829 else if (strcasecmp(argv[1], "isequal") == 0) 2830 pfilter.cmp_type = FILT_CMP_EQUAL; 2831 else if (strcasecmp(argv[1], "startswith") == 0) 2832 pfilter.cmp_type = FILT_CMP_STARTS; 2833 else if (strcasecmp(argv[1], "regex") == 0) 2834 pfilter.cmp_type = FILT_CMP_REGEX; 2835 else if (strcasecmp(argv[1], "ereregex") == 0) { 2836 pfilter.cmp_type = FILT_CMP_REGEX; 2837 pfilter.cmp_flags |= REG_EXTENDED; 2838 } else { 2839 dprintf("unknown cmp function"); 2840 goto error; 2841 } 2842 2843 /* 2844 * Handle filter value 2845 */ 2846 2847 /* ' ".*Deny.*"' */ 2848 /* remove leading whitespace and check for '"' next character */ 2849 filter += strspn(filter, ", \t\n"); 2850 if (*filter != '"' || strlen(filter) < 3) { 2851 dprintf("property value parse error"); 2852 goto error; 2853 } 2854 filter++; 2855 2856 /* '.*Deny.*"' */ 2857 /* process possible backslash (\") escaping */ 2858 escaped = 0; 2859 filter_endpos = filter; 2860 for (p = filter; *p != '\0'; p++) { 2861 if (*p == '\\' && !escaped) { 2862 escaped = 1; 2863 /* do not shift filter_endpos */ 2864 continue; 2865 } 2866 if (*p == '"' && !escaped) { 2867 p++; 2868 break; 2869 } 2870 /* we've seen some esc symbols, need to compress the line */ 2871 if (filter_endpos != p) 2872 *filter_endpos = *p; 2873 2874 filter_endpos++; 2875 escaped = 0; 2876 } 2877 2878 *filter_endpos = '\0'; 2879 /* '.*Deny.*' */ 2880 2881 /* We should not have anything but whitespace left after closing '"' */ 2882 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2883 dprintf("property value parse error"); 2884 goto error; 2885 } 2886 2887 pfilter.pflt_strval = filter; 2888 /* An nvlist is heap allocated heap here. */ 2889 nvl_pfilter = prop_filter_to_nvlist(&pfilter); 2890 2891 free(filter_begpos); 2892 return (nvl_pfilter); 2893 error: 2894 free(filter_begpos); 2895 return (NULL); 2896 } 2897 2898 static const char * 2899 parse_selector(const char *p, struct filed *f) 2900 { 2901 int i, pri; 2902 int pri_done = 0, pri_cmp = 0, pri_invert = 0; 2903 char *bp, buf[LINE_MAX]; 2904 const char *q; 2905 2906 /* find the end of this facility name list */ 2907 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';) 2908 continue; 2909 2910 /* get the priority comparison */ 2911 if (*q == '!') { 2912 pri_invert = 1; 2913 q++; 2914 } 2915 while (!pri_done) { 2916 switch (*q) { 2917 case '<': 2918 pri_cmp |= PRI_LT; 2919 q++; 2920 break; 2921 case '=': 2922 pri_cmp |= PRI_EQ; 2923 q++; 2924 break; 2925 case '>': 2926 pri_cmp |= PRI_GT; 2927 q++; 2928 break; 2929 default: 2930 pri_done++; 2931 break; 2932 } 2933 } 2934 2935 /* collect priority name */ 2936 for (bp = buf; *q != '\0' && !strchr("\t,; ", *q); ) 2937 *bp++ = *q++; 2938 *bp = '\0'; 2939 2940 /* skip cruft */ 2941 while (strchr(",;", *q)) 2942 q++; 2943 2944 /* decode priority name */ 2945 if (*buf == '*') { 2946 pri = LOG_PRIMASK; 2947 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2948 } else { 2949 /* Ignore trailing spaces. */ 2950 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2951 buf[i] = '\0'; 2952 2953 pri = decode(buf, prioritynames); 2954 if (pri < 0) { 2955 dprintf("unknown priority name \"%s\"", buf); 2956 return (NULL); 2957 } 2958 } 2959 if (!pri_cmp) 2960 pri_cmp = UniquePriority ? PRI_EQ : (PRI_EQ | PRI_GT); 2961 if (pri_invert) 2962 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2963 2964 /* scan facilities */ 2965 while (*p != '\0' && !strchr("\t.; ", *p)) { 2966 for (bp = buf; *p != '\0' && !strchr("\t,;. ", *p); ) 2967 *bp++ = *p++; 2968 *bp = '\0'; 2969 2970 if (*buf == '*') { 2971 for (i = 0; i < LOG_NFACILITIES; i++) { 2972 f->f_pmask[i] = pri; 2973 f->f_pcmp[i] = pri_cmp; 2974 } 2975 } else { 2976 i = decode(buf, facilitynames); 2977 if (i < 0) { 2978 dprintf("unknown facility name \"%s\"", buf); 2979 return (NULL); 2980 } 2981 f->f_pmask[i >> 3] = pri; 2982 f->f_pcmp[i >> 3] = pri_cmp; 2983 } 2984 while (*p == ',' || *p == ' ') 2985 p++; 2986 } 2987 return (q); 2988 } 2989 2990 static int 2991 maybe_dup_forw_socket(const nvlist_t *nvl, const struct sockaddr *rsa, 2992 const struct sockaddr *lsa) 2993 { 2994 const nvlist_t * const *line; 2995 size_t linecount; 2996 2997 if (!nvlist_exists_nvlist_array(nvl, "filed_list")) 2998 return (-1); 2999 line = nvlist_get_nvlist_array(nvl, "filed_list", &linecount); 3000 for (size_t i = 0; i < linecount; i++) { 3001 const struct forw_addr *forw; 3002 const int *fdp; 3003 size_t fdc; 3004 3005 if (nvlist_get_number(line[i], "f_type") != F_FORW) 3006 continue; 3007 fdp = nvlist_get_descriptor_array(line[i], "f_addr_fds", &fdc); 3008 forw = nvlist_get_binary(line[i], "f_addrs", NULL); 3009 for (size_t j = 0; j < fdc; j++) { 3010 int fd; 3011 3012 if (memcmp(&forw[j].raddr, rsa, rsa->sa_len) != 0 || 3013 memcmp(&forw[j].laddr, lsa, lsa->sa_len) != 0) 3014 continue; 3015 3016 fd = dup(fdp[j]); 3017 if (fd < 0) 3018 err(1, "dup"); 3019 return (fd); 3020 } 3021 } 3022 3023 return (-1); 3024 } 3025 3026 /* 3027 * Create a UDP socket that will forward messages from "lai" to "ai". 3028 * Capsicum doesn't permit connect() or sendto(), so we can't reuse the (bound) 3029 * sockets used to listen for messages. 3030 */ 3031 static int 3032 make_forw_socket(const nvlist_t *nvl, struct addrinfo *ai, struct addrinfo *lai) 3033 { 3034 int s; 3035 3036 s = socket(ai->ai_family, ai->ai_socktype, 0); 3037 if (s < 0) 3038 err(1, "socket"); 3039 if (lai != NULL) { 3040 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 3041 sizeof(int)) < 0) 3042 err(1, "setsockopt"); 3043 if (bind(s, lai->ai_addr, lai->ai_addrlen) < 0) 3044 err(1, "bind"); 3045 } 3046 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) { 3047 if (errno == EADDRINUSE && lai != NULL) { 3048 int s1; 3049 3050 s1 = maybe_dup_forw_socket(nvl, ai->ai_addr, 3051 lai->ai_addr); 3052 if (s1 < 0) 3053 errc(1, EADDRINUSE, "connect"); 3054 (void)close(s); 3055 s = s1; 3056 } else { 3057 err(1, "connect"); 3058 } 3059 } 3060 /* Make it a write-only socket. */ 3061 if (shutdown(s, SHUT_RD) < 0) 3062 err(1, "shutdown"); 3063 3064 return (s); 3065 } 3066 3067 static void 3068 make_forw_socket_array(const nvlist_t *nvl, struct filed *f, 3069 struct addrinfo *res) 3070 { 3071 struct addrinfo *ai; 3072 size_t i; 3073 3074 f->f_num_addr_fds = 0; 3075 3076 /* How many sockets do we need? */ 3077 for (ai = res; ai != NULL; ai = ai->ai_next) { 3078 struct socklist *boundsock; 3079 int count; 3080 3081 count = 0; 3082 STAILQ_FOREACH(boundsock, &shead, next) { 3083 if (boundsock->sl_ai.ai_family == ai->ai_family) 3084 count++; 3085 } 3086 if (count == 0) 3087 count = 1; 3088 f->f_num_addr_fds += count; 3089 } 3090 3091 f->f_addr_fds = calloc(f->f_num_addr_fds, sizeof(*f->f_addr_fds)); 3092 f->f_addrs = calloc(f->f_num_addr_fds, sizeof(*f->f_addrs)); 3093 if (f->f_addr_fds == NULL || f->f_addrs == NULL) 3094 err(1, "malloc failed"); 3095 3096 /* 3097 * Create our forwarding sockets: for each bound socket 3098 * belonging to the destination address, create one socket 3099 * connected to the destination and bound to the address of the 3100 * listening socket. 3101 */ 3102 i = 0; 3103 for (ai = res; ai != NULL; ai = ai->ai_next) { 3104 struct socklist *boundsock; 3105 int count; 3106 3107 count = 0; 3108 STAILQ_FOREACH(boundsock, &shead, next) { 3109 if (boundsock->sl_ai.ai_family == 3110 ai->ai_family) { 3111 memcpy(&f->f_addrs[i].raddr, ai->ai_addr, 3112 ai->ai_addrlen); 3113 memcpy(&f->f_addrs[i].laddr, 3114 boundsock->sl_ai.ai_addr, 3115 boundsock->sl_ai.ai_addrlen); 3116 f->f_addr_fds[i++] = make_forw_socket(nvl, ai, 3117 &boundsock->sl_ai); 3118 count++; 3119 } 3120 } 3121 if (count == 0) { 3122 memcpy(&f->f_addrs[i].raddr, ai->ai_addr, 3123 ai->ai_addrlen); 3124 f->f_addr_fds[i++] = make_forw_socket(nvl, ai, NULL); 3125 } 3126 } 3127 assert(i == f->f_num_addr_fds); 3128 } 3129 3130 static void 3131 parse_action(const nvlist_t *nvl, const char *p, struct filed *f) 3132 { 3133 struct addrinfo hints, *res; 3134 size_t i; 3135 int error; 3136 const char *q; 3137 bool syncfile; 3138 3139 if (*p == '-') { 3140 syncfile = false; 3141 p++; 3142 } else 3143 syncfile = true; 3144 3145 f->f_file = -1; 3146 switch (*p) { 3147 case '@': 3148 { 3149 char *tp; 3150 char endkey = ':'; 3151 /* 3152 * scan forward to see if there is a port defined. 3153 * so we can't use strlcpy.. 3154 */ 3155 i = sizeof(f->f_hname); 3156 tp = f->f_hname; 3157 p++; 3158 3159 /* 3160 * an ipv6 address should start with a '[' in that case 3161 * we should scan for a ']' 3162 */ 3163 if (*p == '[') { 3164 p++; 3165 endkey = ']'; 3166 } 3167 while (*p && (*p != endkey) && (i-- > 0)) { 3168 *tp++ = *p++; 3169 } 3170 if (endkey == ']' && *p == endkey) 3171 p++; 3172 *tp = '\0'; 3173 } 3174 /* See if we copied a domain and have a port */ 3175 if (*p == ':') 3176 p++; 3177 else 3178 p = NULL; 3179 3180 hints = (struct addrinfo){ 3181 .ai_family = family, 3182 .ai_socktype = SOCK_DGRAM 3183 }; 3184 error = getaddrinfo(f->f_hname, p ? p : "syslog", &hints, &res); 3185 if (error) { 3186 dprintf("%s\n", gai_strerror(error)); 3187 break; 3188 } 3189 make_forw_socket_array(nvl, f, res); 3190 freeaddrinfo(res); 3191 f->f_type = F_FORW; 3192 break; 3193 3194 case '/': 3195 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3196 f->f_type = F_UNUSED; 3197 dprintf("%s\n", p); 3198 break; 3199 } 3200 if (syncfile) 3201 f->f_flags |= FFLAG_SYNC; 3202 if (isatty(f->f_file)) { 3203 if (strcmp(p, _PATH_CONSOLE) == 0) 3204 f->f_type = F_CONSOLE; 3205 else 3206 f->f_type = F_TTY; 3207 (void)strlcpy(f->f_fname, p + sizeof(_PATH_DEV) - 1, 3208 sizeof(f->f_fname)); 3209 } else { 3210 (void)strlcpy(f->f_fname, p, sizeof(f->f_fname)); 3211 f->f_type = F_FILE; 3212 } 3213 break; 3214 3215 case '|': 3216 f->f_procdesc = -1; 3217 (void)strlcpy(f->f_pname, p + 1, sizeof(f->f_pname)); 3218 f->f_type = F_PIPE; 3219 break; 3220 3221 case '*': 3222 f->f_type = F_WALL; 3223 break; 3224 3225 default: 3226 for (i = 0; i < MAXUNAMES && *p; i++) { 3227 for (q = p; *q && *q != ','; ) 3228 q++; 3229 (void)strncpy(f->f_uname[i], p, MAXLOGNAME - 1); 3230 if ((q - p) >= MAXLOGNAME) 3231 f->f_uname[i][MAXLOGNAME - 1] = '\0'; 3232 else 3233 f->f_uname[i][q - p] = '\0'; 3234 while (*q == ',' || *q == ' ') 3235 q++; 3236 p = q; 3237 } 3238 f->f_type = F_USERS; 3239 break; 3240 } 3241 } 3242 3243 /* 3244 * Convert a configuration file line to an nvlist and add to "nvl", which 3245 * contains all of the log configuration processed thus far. 3246 */ 3247 static void 3248 cfline(nvlist_t *nvl, const char *line, const char *prog, const char *host, 3249 const char *pfilter) 3250 { 3251 nvlist_t *nvl_filed; 3252 struct filed f = { }; 3253 const char *p; 3254 3255 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 3256 host, pfilter); 3257 3258 for (int i = 0; i <= LOG_NFACILITIES; i++) 3259 f.f_pmask[i] = INTERNAL_NOPRI; 3260 3261 /* save hostname if any */ 3262 if (host != NULL && *host != '*') { 3263 int hl; 3264 3265 strlcpy(f.f_host, host, sizeof(f.f_host)); 3266 hl = strlen(f.f_host); 3267 if (hl > 0 && f.f_host[hl-1] == '.') 3268 f.f_host[--hl] = '\0'; 3269 /* RFC 5424 prefers logging FQDNs. */ 3270 if (IS_RFC3164_FORMAT) 3271 trimdomain(f.f_host, hl); 3272 } 3273 3274 /* save program name if any */ 3275 if (prog != NULL && *prog != '*') 3276 strlcpy(f.f_program, prog, sizeof(f.f_program)); 3277 3278 /* scan through the list of selectors */ 3279 for (p = line; *p != '\0' && *p != '\t' && *p != ' ';) 3280 p = parse_selector(p, &f); 3281 3282 /* skip to action part */ 3283 while (*p == '\t' || *p == ' ') 3284 p++; 3285 parse_action(nvl, p, &f); 3286 3287 /* An nvlist is heap allocated heap here. */ 3288 nvl_filed = filed_to_nvlist(&f); 3289 close_filed(&f); 3290 3291 if (pfilter && *pfilter != '*') { 3292 nvlist_t *nvl_pfilter; 3293 3294 nvl_pfilter = prop_filter_compile(pfilter); 3295 if (nvl_pfilter == NULL) 3296 err(1, "filter compile error"); 3297 nvlist_add_nvlist(nvl_filed, "f_prop_filter", nvl_pfilter); 3298 } 3299 3300 nvlist_append_nvlist_array(nvl, "filed_list", nvl_filed); 3301 nvlist_destroy(nvl_filed); 3302 } 3303 3304 /* 3305 * Decode a symbolic name to a numeric value 3306 */ 3307 static int 3308 decode(const char *name, const CODE *codetab) 3309 { 3310 const CODE *c; 3311 char *p, buf[40]; 3312 3313 if (isdigit(*name)) 3314 return (atoi(name)); 3315 3316 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3317 if (isupper(*name)) 3318 *p = tolower(*name); 3319 else 3320 *p = *name; 3321 } 3322 *p = '\0'; 3323 for (c = codetab; c->c_name; c++) 3324 if (!strcmp(buf, c->c_name)) 3325 return (c->c_val); 3326 3327 return (-1); 3328 } 3329 3330 static void 3331 markit(void) 3332 { 3333 struct filed *f; 3334 struct deadq_entry *dq, *dq0; 3335 3336 now = time((time_t *)NULL); 3337 MarkSeq += TIMERINTVL; 3338 if (MarkSeq >= MarkInterval) { 3339 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3340 "-- MARK --", MARK); 3341 MarkSeq = 0; 3342 } 3343 3344 STAILQ_FOREACH(f, &fhead, next) { 3345 if (f->f_prevcount && now >= REPEATTIME(f)) { 3346 dprintf("flush %s: repeated %d times, %d sec.\n", 3347 TypeNames[f->f_type], f->f_prevcount, 3348 repeatinterval[f->f_repeatcount]); 3349 fprintlog_successive(f, 0); 3350 BACKOFF(f); 3351 } 3352 } 3353 3354 /* Walk the dead queue, and see if we should signal somebody. */ 3355 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3356 switch (dq->dq_timeout) { 3357 case 0: 3358 /* Already signalled once, try harder now. */ 3359 (void)pdkill(dq->dq_procdesc, SIGKILL); 3360 break; 3361 3362 case 1: 3363 (void)pdkill(dq->dq_procdesc, SIGTERM); 3364 /* FALLTHROUGH. */ 3365 default: 3366 dq->dq_timeout--; 3367 } 3368 } 3369 (void)alarm(TIMERINTVL); 3370 } 3371 3372 /* 3373 * fork off and become a daemon, but wait for the child to come online 3374 * before returning to the parent, or we get disk thrashing at boot etc. 3375 */ 3376 static int 3377 waitdaemon(int maxwait) 3378 { 3379 struct pollfd pollfd; 3380 int events, pipefd[2], status; 3381 pid_t pid; 3382 3383 if (pipe(pipefd) == -1) { 3384 warn("failed to daemonize, pipe"); 3385 die(0); 3386 } 3387 pid = fork(); 3388 if (pid == -1) { 3389 warn("failed to daemonize, fork"); 3390 die(0); 3391 } else if (pid > 0) { 3392 close(pipefd[1]); 3393 pollfd.fd = pipefd[0]; 3394 pollfd.events = POLLHUP; 3395 events = poll(&pollfd, 1, maxwait * 1000); 3396 if (events == -1) 3397 err(1, "failed to daemonize, poll"); 3398 else if (events == 0) 3399 errx(1, "timed out waiting for child"); 3400 if (waitpid(pid, &status, WNOHANG) > 0) { 3401 if (WIFEXITED(status)) 3402 errx(1, "child pid %d exited with return code %d", 3403 pid, WEXITSTATUS(status)); 3404 if (WIFSIGNALED(status)) 3405 errx(1, "child pid %d exited on signal %d%s", 3406 pid, WTERMSIG(status), 3407 WCOREDUMP(status) ? " (core dumped)" : ""); 3408 } 3409 exit(0); 3410 } 3411 close(pipefd[0]); 3412 if (setsid() == -1) { 3413 warn("failed to daemonize, setsid"); 3414 die(0); 3415 } 3416 (void)chdir("/"); 3417 (void)dup2(nulldesc, STDIN_FILENO); 3418 (void)dup2(nulldesc, STDOUT_FILENO); 3419 (void)dup2(nulldesc, STDERR_FILENO); 3420 return (pipefd[1]); 3421 } 3422 3423 /* 3424 * Add `s' to the list of allowable peer addresses to accept messages 3425 * from. 3426 * 3427 * `s' is a string in the form: 3428 * 3429 * [*]domainname[:{servicename|portnumber|*}] 3430 * 3431 * or 3432 * 3433 * netaddr/maskbits[:{servicename|portnumber|*}] 3434 * 3435 * Returns false on error, true if the argument was valid. 3436 */ 3437 static bool 3438 #if defined(INET) || defined(INET6) 3439 allowaddr(char *s) 3440 #else 3441 allowaddr(char *s __unused) 3442 #endif 3443 { 3444 #if defined(INET) || defined(INET6) 3445 char *cp1, *cp2; 3446 struct allowedpeer *ap; 3447 struct servent *se; 3448 int masklen = -1; 3449 struct addrinfo hints, *res = NULL; 3450 #ifdef INET 3451 in_addr_t *addrp, *maskp; 3452 #endif 3453 #ifdef INET6 3454 uint32_t *addr6p, *mask6p; 3455 #endif 3456 char ip[NI_MAXHOST]; 3457 3458 ap = calloc(1, sizeof(*ap)); 3459 if (ap == NULL) 3460 err(1, "malloc failed"); 3461 3462 #ifdef INET6 3463 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3464 #endif 3465 cp1 = s; 3466 if ((cp1 = strrchr(cp1, ':'))) { 3467 /* service/port provided */ 3468 *cp1++ = '\0'; 3469 if (strlen(cp1) == 1 && *cp1 == '*') 3470 /* any port allowed */ 3471 ap->port = 0; 3472 else if ((se = getservbyname(cp1, "udp"))) { 3473 ap->port = ntohs(se->s_port); 3474 } else { 3475 ap->port = strtol(cp1, &cp2, 0); 3476 /* port not numeric */ 3477 if (*cp2 != '\0') 3478 goto err; 3479 } 3480 } else { 3481 if ((se = getservbyname("syslog", "udp"))) 3482 ap->port = ntohs(se->s_port); 3483 else 3484 /* sanity, should not happen */ 3485 ap->port = 514; 3486 } 3487 3488 if ((cp1 = strchr(s, '/')) != NULL && 3489 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3490 *cp1 = '\0'; 3491 if ((masklen = atoi(cp1 + 1)) < 0) 3492 goto err; 3493 } 3494 #ifdef INET6 3495 if (*s == '[') { 3496 cp2 = s + strlen(s) - 1; 3497 if (*cp2 == ']') { 3498 ++s; 3499 *cp2 = '\0'; 3500 } else { 3501 cp2 = NULL; 3502 } 3503 } else { 3504 cp2 = NULL; 3505 } 3506 #endif 3507 hints = (struct addrinfo){ 3508 .ai_family = PF_UNSPEC, 3509 .ai_socktype = SOCK_DGRAM, 3510 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3511 }; 3512 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3513 ap->isnumeric = true; 3514 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3515 ap->a_mask = (struct sockaddr_storage){ 3516 .ss_family = res->ai_family, 3517 .ss_len = res->ai_addrlen 3518 }; 3519 switch (res->ai_family) { 3520 #ifdef INET 3521 case AF_INET: 3522 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3523 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3524 if (masklen < 0) { 3525 /* use default netmask */ 3526 if (IN_CLASSA(ntohl(*addrp))) 3527 *maskp = htonl(IN_CLASSA_NET); 3528 else if (IN_CLASSB(ntohl(*addrp))) 3529 *maskp = htonl(IN_CLASSB_NET); 3530 else 3531 *maskp = htonl(IN_CLASSC_NET); 3532 } else if (masklen == 0) { 3533 *maskp = 0; 3534 } else if (masklen <= 32) { 3535 /* convert masklen to netmask */ 3536 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3537 } else { 3538 goto err; 3539 } 3540 /* Lose any host bits in the network number. */ 3541 *addrp &= *maskp; 3542 break; 3543 #endif 3544 #ifdef INET6 3545 case AF_INET6: 3546 if (masklen > 128) 3547 goto err; 3548 3549 if (masklen < 0) 3550 masklen = 128; 3551 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3552 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3553 /* convert masklen to netmask */ 3554 while (masklen > 0) { 3555 if (masklen < 32) { 3556 *mask6p = 3557 htonl(~(0xffffffff >> masklen)); 3558 *addr6p &= *mask6p; 3559 break; 3560 } else { 3561 *mask6p++ = 0xffffffff; 3562 addr6p++; 3563 masklen -= 32; 3564 } 3565 } 3566 break; 3567 #endif 3568 default: 3569 goto err; 3570 } 3571 freeaddrinfo(res); 3572 } else { 3573 /* arg `s' is domain name */ 3574 ap->isnumeric = false; 3575 ap->a_name = s; 3576 if (cp1) 3577 *cp1 = '/'; 3578 #ifdef INET6 3579 if (cp2) { 3580 *cp2 = ']'; 3581 --s; 3582 } 3583 #endif 3584 } 3585 STAILQ_INSERT_TAIL(&aphead, ap, next); 3586 3587 if (Debug) { 3588 printf("allowaddr: rule "); 3589 if (ap->isnumeric) { 3590 printf("numeric, "); 3591 getnameinfo(sstosa(&ap->a_addr), 3592 (sstosa(&ap->a_addr))->sa_len, 3593 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3594 printf("addr = %s, ", ip); 3595 getnameinfo(sstosa(&ap->a_mask), 3596 (sstosa(&ap->a_mask))->sa_len, 3597 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3598 printf("mask = %s; ", ip); 3599 } else { 3600 printf("domainname = %s; ", ap->a_name); 3601 } 3602 printf("port = %d\n", ap->port); 3603 } 3604 3605 return (true); 3606 err: 3607 if (res != NULL) 3608 freeaddrinfo(res); 3609 free(ap); 3610 #endif 3611 return (false); 3612 } 3613 3614 /* 3615 * Validate that the remote peer has permission to log to us. 3616 */ 3617 static bool 3618 validate(struct sockaddr *sa, const char *hname) 3619 { 3620 int i; 3621 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3622 struct allowedpeer *ap; 3623 #ifdef INET 3624 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3625 #endif 3626 #ifdef INET6 3627 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3628 #endif 3629 struct addrinfo hints, *res; 3630 u_short sport; 3631 3632 /* traditional behaviour, allow everything */ 3633 if (STAILQ_EMPTY(&aphead)) 3634 return (true); 3635 3636 (void)strlcpy(name, hname, sizeof(name)); 3637 hints = (struct addrinfo){ 3638 .ai_family = PF_UNSPEC, 3639 .ai_socktype = SOCK_DGRAM, 3640 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3641 }; 3642 if (cap_getaddrinfo(cap_net, name, NULL, &hints, &res) == 0) 3643 freeaddrinfo(res); 3644 else if (strchr(name, '.') == NULL) { 3645 strlcat(name, ".", sizeof(name)); 3646 strlcat(name, LocalDomain, sizeof(name)); 3647 } 3648 if (cap_getnameinfo(cap_net, sa, sa->sa_len, ip, sizeof(ip), port, 3649 sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3650 return (false); /* for safety, should not occur */ 3651 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3652 ip, port, name); 3653 sport = atoi(port); 3654 3655 /* now, walk down the list */ 3656 i = 0; 3657 STAILQ_FOREACH(ap, &aphead, next) { 3658 i++; 3659 if (ap->port != 0 && ap->port != sport) { 3660 dprintf("rejected in rule %d due to port mismatch.\n", 3661 i); 3662 continue; 3663 } 3664 3665 if (ap->isnumeric) { 3666 if (ap->a_addr.ss_family != sa->sa_family) { 3667 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3668 continue; 3669 } 3670 #ifdef INET 3671 else if (ap->a_addr.ss_family == AF_INET) { 3672 sin4 = satosin(sa); 3673 a4p = satosin(&ap->a_addr); 3674 m4p = satosin(&ap->a_mask); 3675 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3676 != a4p->sin_addr.s_addr) { 3677 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3678 continue; 3679 } 3680 } 3681 #endif 3682 #ifdef INET6 3683 else if (ap->a_addr.ss_family == AF_INET6) { 3684 sin6 = satosin6(sa); 3685 a6p = satosin6(&ap->a_addr); 3686 m6p = satosin6(&ap->a_mask); 3687 if (a6p->sin6_scope_id != 0 && 3688 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3689 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3690 continue; 3691 } 3692 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3693 &a6p->sin6_addr, &m6p->sin6_addr)) { 3694 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3695 continue; 3696 } 3697 } 3698 #endif 3699 else 3700 continue; 3701 } else { 3702 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3703 FNM_NOMATCH) { 3704 dprintf("rejected in rule %d due to name " 3705 "mismatch.\n", i); 3706 continue; 3707 } 3708 } 3709 dprintf("accepted in rule %d.\n", i); 3710 return (true); /* hooray! */ 3711 } 3712 return (false); 3713 } 3714 3715 /* 3716 * Fairly similar to popen(3), but returns an open descriptor, as 3717 * opposed to a FILE *. 3718 * 3719 * Note: This function is wrapped by cap_p_open() when Capsicum support is 3720 * enabled, which allows piped processes to run outside of the capability 3721 * sandbox. 3722 */ 3723 int 3724 p_open(const char *prog, int *rpd) 3725 { 3726 struct sigaction act = { }; 3727 int pfd[2], pd; 3728 pid_t pid; 3729 char *argv[4]; /* sh -c cmd NULL */ 3730 3731 if (pipe(pfd) == -1) 3732 return (-1); 3733 3734 switch ((pid = pdfork(&pd, PD_CLOEXEC))) { 3735 case -1: 3736 return (-1); 3737 3738 case 0: 3739 (void)setsid(); /* Avoid catching SIGHUPs. */ 3740 argv[0] = strdup("sh"); 3741 argv[1] = strdup("-c"); 3742 argv[2] = strdup(prog); 3743 argv[3] = NULL; 3744 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) 3745 err(1, "strdup"); 3746 3747 alarm(0); 3748 act.sa_handler = SIG_DFL; 3749 for (size_t i = 0; i < nitems(sigcatch); ++i) { 3750 if (sigaction(sigcatch[i], &act, NULL) == -1) 3751 err(1, "sigaction"); 3752 } 3753 3754 dup2(pfd[0], STDIN_FILENO); 3755 dup2(nulldesc, STDOUT_FILENO); 3756 dup2(nulldesc, STDERR_FILENO); 3757 closefrom(STDERR_FILENO + 1); 3758 3759 (void)execvp(_PATH_BSHELL, argv); 3760 _exit(255); 3761 } 3762 close(pfd[0]); 3763 /* 3764 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3765 * supposed to get an EWOULDBLOCK on writev(2), which is 3766 * caught by the logic above anyway, which will in turn close 3767 * the pipe, and fork a new logging subprocess if necessary. 3768 * The stale subprocess will be killed some time later unless 3769 * it terminated itself due to closing its input pipe (so we 3770 * get rid of really dead puppies). 3771 */ 3772 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3773 /* This is bad. */ 3774 dprintf("Warning: cannot change pipe to PID %d to non-blocking" 3775 "behaviour.", pid); 3776 } 3777 *rpd = pd; 3778 return (pfd[1]); 3779 } 3780 3781 static struct deadq_entry * 3782 deadq_enter(int pd) 3783 { 3784 struct deadq_entry *dq; 3785 3786 if (pd == -1) 3787 return (NULL); 3788 3789 dq = malloc(sizeof(*dq)); 3790 if (dq == NULL) { 3791 logerror("malloc"); 3792 exit(1); 3793 } 3794 3795 dq->dq_procdesc = pd; 3796 dq->dq_timeout = DQ_TIMO_INIT; 3797 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3798 return (dq); 3799 } 3800 3801 static void 3802 deadq_remove(struct deadq_entry *dq) 3803 { 3804 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3805 free(dq); 3806 } 3807 3808 static void 3809 log_deadchild(int pd, int status, const struct filed *f) 3810 { 3811 pid_t pid; 3812 int code; 3813 char buf[256]; 3814 const char *reason; 3815 3816 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 3817 if (WIFSIGNALED(status)) { 3818 reason = "due to signal"; 3819 code = WTERMSIG(status); 3820 } else { 3821 reason = "with status"; 3822 code = WEXITSTATUS(status); 3823 if (code == 0) 3824 return; 3825 } 3826 if (pdgetpid(pd, &pid) == -1) 3827 err(1, "pdgetpid"); 3828 (void)snprintf(buf, sizeof(buf), 3829 "Logging subprocess %d (%s) exited %s %d.", 3830 pid, f->f_pname, reason, code); 3831 logerror(buf); 3832 } 3833 3834 static struct socklist * 3835 socksetup(struct addrinfo *ai, const char *name, mode_t mode) 3836 { 3837 struct socklist *sl; 3838 int (*sl_recv)(struct socklist *); 3839 int s, optval = 1; 3840 3841 if (ai->ai_family != AF_LOCAL && SecureMode > 1) { 3842 /* Only AF_LOCAL in secure mode. */ 3843 return (NULL); 3844 } 3845 if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL && 3846 ai->ai_family != family) 3847 return (NULL); 3848 3849 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 3850 if (s < 0) { 3851 logerror("socket"); 3852 return (NULL); 3853 } 3854 #ifdef INET6 3855 if (ai->ai_family == AF_INET6) { 3856 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval, 3857 sizeof(int)) < 0) { 3858 logerror("setsockopt(IPV6_V6ONLY)"); 3859 close(s); 3860 return (NULL); 3861 } 3862 } 3863 #endif 3864 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval, 3865 sizeof(int)) < 0) { 3866 logerror("setsockopt(SO_REUSEADDR)"); 3867 close(s); 3868 return (NULL); 3869 } 3870 3871 /* 3872 * Bind INET and UNIX-domain sockets. 3873 * 3874 * A UNIX-domain socket is always bound to a pathname 3875 * regardless of -N flag. 3876 * 3877 * For INET sockets, RFC 3164 recommends that client 3878 * side message should come from the privileged syslogd port. 3879 * 3880 * If the system administrator chooses not to obey 3881 * this, we can skip the bind() step so that the 3882 * system will choose a port for us. 3883 */ 3884 if (ai->ai_family == AF_LOCAL) 3885 unlink(name); 3886 if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) { 3887 mode_t mask; 3888 int error; 3889 3890 if (ai->ai_family == AF_LOCAL && fchmod(s, mode) < 0) { 3891 dprintf("fchmod %s: %s\n", name, strerror(errno)); 3892 close(s); 3893 return (NULL); 3894 } 3895 3896 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1}, 3897 sizeof(int)) < 0) { 3898 logerror("setsockopt(SO_REUSEPORT)"); 3899 close(s); 3900 return (NULL); 3901 } 3902 3903 /* 3904 * For AF_LOCAL sockets, the process umask is applied to the 3905 * mode set above, so temporarily clear it to ensure that the 3906 * socket always has the correct permissions. 3907 */ 3908 mask = umask(0); 3909 error = bind(s, ai->ai_addr, ai->ai_addrlen); 3910 (void)umask(mask); 3911 if (error < 0) { 3912 logerror("bind"); 3913 close(s); 3914 return (NULL); 3915 } 3916 if (ai->ai_family == AF_LOCAL || SecureMode == 0) 3917 increase_rcvbuf(s); 3918 } 3919 dprintf("new socket fd is %d\n", s); 3920 sl_recv = socklist_recv_sock; 3921 #if defined(INET) || defined(INET6) 3922 if (SecureMode && (ai->ai_family == AF_INET || 3923 ai->ai_family == AF_INET6)) { 3924 dprintf("shutdown\n"); 3925 /* Forbid communication in secure mode. */ 3926 if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) { 3927 logerror("shutdown"); 3928 if (!Debug) 3929 die(0); 3930 } 3931 sl_recv = NULL; 3932 } else 3933 #endif 3934 dprintf("listening on socket\n"); 3935 dprintf("sending on socket\n"); 3936 /* Copy *ai->ai_addr to the tail of struct socklist if any. */ 3937 sl = calloc(1, sizeof(*sl) + ai->ai_addrlen); 3938 if (sl == NULL) 3939 err(1, "malloc failed"); 3940 sl->sl_socket = s; 3941 if (ai->ai_family == AF_LOCAL) { 3942 char *name2 = strdup(name); 3943 if (name2 == NULL) 3944 err(1, "strdup failed"); 3945 sl->sl_name = strdup(basename(name2)); 3946 sl->sl_dirfd = open(dirname(name2), O_DIRECTORY); 3947 if (sl->sl_name == NULL || sl->sl_dirfd == -1) 3948 err(1, "failed to save dir info for %s", name); 3949 free(name2); 3950 } 3951 sl->sl_recv = sl_recv; 3952 (void)memcpy(&sl->sl_ai, ai, sizeof(*ai)); 3953 if (ai->ai_addrlen > 0) { 3954 (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); 3955 sl->sl_sa = (struct sockaddr *)(sl + 1); 3956 } else { 3957 sl->sl_sa = NULL; 3958 } 3959 return (sl); 3960 } 3961 3962 static void 3963 increase_rcvbuf(int fd) 3964 { 3965 socklen_t len; 3966 3967 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3968 &(socklen_t){sizeof(len)}) == 0) { 3969 if (len < RCVBUF_MINSIZE) { 3970 len = RCVBUF_MINSIZE; 3971 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3972 } 3973 } 3974 } 3975