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-FreeBSD 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 #ifndef lint 60 static const char copyright[] = 61 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\ 62 The Regents of the University of California. All rights reserved.\n"; 63 #endif /* not lint */ 64 65 #ifndef lint 66 #if 0 67 static char sccsid[] = "@(#)syslogd.c 8.3 (Berkeley) 4/4/94"; 68 #endif 69 #endif /* not lint */ 70 71 #include <sys/cdefs.h> 72 __FBSDID("$FreeBSD$"); 73 74 /* 75 * syslogd -- log system messages 76 * 77 * This program implements a system log. It takes a series of lines. 78 * Each line may have a priority, signified as "<n>" as 79 * the first characters of the line. If this is 80 * not present, a default priority is used. 81 * 82 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 83 * cause it to reread its configuration file. 84 * 85 * Defined Constants: 86 * 87 * MAXLINE -- the maximum line length that can be handled. 88 * DEFUPRI -- the default priority for user messages 89 * DEFSPRI -- the default priority for kernel messages 90 * 91 * Author: Eric Allman 92 * extensive changes by Ralph Campbell 93 * more extensive changes by Eric Allman (again) 94 * Extension to log by program name as well as facility and priority 95 * by Peter da Silva. 96 * -u and -v by Harlan Stenn. 97 * Priority comparison code by Harlan Stenn. 98 */ 99 100 #define MAXLINE 8192 /* maximum line length */ 101 #define MAXSVLINE MAXLINE /* maximum saved line length */ 102 #define DEFUPRI (LOG_USER|LOG_NOTICE) 103 #define DEFSPRI (LOG_KERN|LOG_CRIT) 104 #define TIMERINTVL 30 /* interval for checking flush, mark */ 105 #define TTYMSGTIME 1 /* timeout passed to ttymsg */ 106 #define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 107 108 #include <sys/param.h> 109 #include <sys/ioctl.h> 110 #include <sys/mman.h> 111 #include <sys/queue.h> 112 #include <sys/resource.h> 113 #include <sys/socket.h> 114 #include <sys/stat.h> 115 #include <sys/syslimits.h> 116 #include <sys/time.h> 117 #include <sys/uio.h> 118 #include <sys/un.h> 119 #include <sys/wait.h> 120 121 #if defined(INET) || defined(INET6) 122 #include <netinet/in.h> 123 #include <arpa/inet.h> 124 #endif 125 126 #include <assert.h> 127 #include <ctype.h> 128 #include <dirent.h> 129 #include <err.h> 130 #include <errno.h> 131 #include <fcntl.h> 132 #include <fnmatch.h> 133 #include <libutil.h> 134 #include <limits.h> 135 #include <netdb.h> 136 #include <paths.h> 137 #include <signal.h> 138 #include <stdbool.h> 139 #include <stddef.h> 140 #include <stdio.h> 141 #include <stdlib.h> 142 #include <string.h> 143 #include <sysexits.h> 144 #include <unistd.h> 145 #include <utmpx.h> 146 #include <regex.h> 147 148 #include "pathnames.h" 149 #include "ttymsg.h" 150 151 #define SYSLOG_NAMES 152 #include <sys/syslog.h> 153 154 static const char *ConfFile = _PATH_LOGCONF; 155 static const char *PidFile = _PATH_LOGPID; 156 static const char ctty[] = _PATH_CONSOLE; 157 static const char include_str[] = "include"; 158 static const char include_ext[] = ".conf"; 159 160 #define dprintf if (Debug) printf 161 162 #define MAXUNAMES 20 /* maximum number of user names */ 163 164 #define sstosa(ss) ((struct sockaddr *)(ss)) 165 #ifdef INET 166 #define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 167 #define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 168 #endif 169 #ifdef INET6 170 #define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 171 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 172 #define s6_addr32 __u6_addr.__u6_addr32 173 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 174 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 175 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 176 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 177 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 178 #endif 179 /* 180 * List of peers and sockets for binding. 181 */ 182 struct peer { 183 const char *pe_name; 184 const char *pe_serv; 185 mode_t pe_mode; 186 STAILQ_ENTRY(peer) next; 187 }; 188 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 189 190 struct socklist { 191 struct addrinfo sl_ai; 192 #define sl_sa sl_ai.ai_addr 193 #define sl_salen sl_ai.ai_addrlen 194 #define sl_family sl_ai.ai_family 195 int sl_socket; 196 struct peer *sl_peer; 197 int (*sl_recv)(struct socklist *); 198 STAILQ_ENTRY(socklist) next; 199 }; 200 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 201 202 /* 203 * Flags to logmsg(). 204 */ 205 206 #define IGN_CONS 0x001 /* don't print on console */ 207 #define SYNC_FILE 0x002 /* do fsync on file after printing */ 208 #define MARK 0x008 /* this message is a mark */ 209 #define ISKERNEL 0x010 /* kernel generated message */ 210 211 /* Timestamps of log entries. */ 212 struct logtime { 213 struct tm tm; 214 suseconds_t usec; 215 }; 216 217 /* Traditional syslog timestamp format. */ 218 #define RFC3164_DATELEN 15 219 #define RFC3164_DATEFMT "%b %e %H:%M:%S" 220 221 /* 222 * This structure holds a property-based filter 223 */ 224 225 struct prop_filter { 226 uint8_t prop_type; 227 #define PROP_TYPE_NOOP 0 228 #define PROP_TYPE_MSG 1 229 #define PROP_TYPE_HOSTNAME 2 230 #define PROP_TYPE_PROGNAME 3 231 232 uint8_t cmp_type; 233 #define PROP_CMP_CONTAINS 1 234 #define PROP_CMP_EQUAL 2 235 #define PROP_CMP_STARTS 3 236 #define PROP_CMP_REGEX 4 237 238 uint16_t cmp_flags; 239 #define PROP_FLAG_EXCLUDE (1 << 0) 240 #define PROP_FLAG_ICASE (1 << 1) 241 242 union { 243 char *p_strval; 244 regex_t *p_re; 245 } pflt_uniptr; 246 #define pflt_strval pflt_uniptr.p_strval 247 #define pflt_re pflt_uniptr.p_re 248 249 size_t pflt_strlen; 250 }; 251 252 /* 253 * This structure represents the files that will have log 254 * copies printed. 255 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 256 * or if f_type is F_PIPE and f_pid > 0. 257 */ 258 259 struct filed { 260 STAILQ_ENTRY(filed) next; /* next in linked list */ 261 short f_type; /* entry type, see below */ 262 short f_file; /* file descriptor */ 263 time_t f_time; /* time this was last written */ 264 char *f_host; /* host from which to recd. */ 265 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 266 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 267 #define PRI_LT 0x1 268 #define PRI_EQ 0x2 269 #define PRI_GT 0x4 270 char *f_program; /* program this applies to */ 271 struct prop_filter *f_prop_filter; /* property-based filter */ 272 union { 273 char f_uname[MAXUNAMES][MAXLOGNAME]; 274 struct { 275 char f_hname[MAXHOSTNAMELEN]; 276 struct addrinfo *f_addr; 277 278 } f_forw; /* forwarding address */ 279 char f_fname[MAXPATHLEN]; 280 struct { 281 char f_pname[MAXPATHLEN]; 282 pid_t f_pid; 283 } f_pipe; 284 } f_un; 285 #define fu_uname f_un.f_uname 286 #define fu_forw_hname f_un.f_forw.f_hname 287 #define fu_forw_addr f_un.f_forw.f_addr 288 #define fu_fname f_un.f_fname 289 #define fu_pipe_pname f_un.f_pipe.f_pname 290 #define fu_pipe_pid f_un.f_pipe.f_pid 291 char f_prevline[MAXSVLINE]; /* last message logged */ 292 struct logtime f_lasttime; /* time of last occurrence */ 293 int f_prevpri; /* pri of f_prevline */ 294 size_t f_prevlen; /* length of f_prevline */ 295 int f_prevcount; /* repetition cnt of prevline */ 296 u_int f_repeatcount; /* number of "repeated" msgs */ 297 int f_flags; /* file-specific flags */ 298 #define FFLAG_SYNC 0x01 299 #define FFLAG_NEEDSYNC 0x02 300 }; 301 302 /* 303 * Queue of about-to-be dead processes we should watch out for. 304 */ 305 struct deadq_entry { 306 pid_t dq_pid; 307 int dq_timeout; 308 TAILQ_ENTRY(deadq_entry) dq_entries; 309 }; 310 static TAILQ_HEAD(, deadq_entry) deadq_head = 311 TAILQ_HEAD_INITIALIZER(deadq_head); 312 313 /* 314 * The timeout to apply to processes waiting on the dead queue. Unit 315 * of measure is `mark intervals', i.e. 20 minutes by default. 316 * Processes on the dead queue will be terminated after that time. 317 */ 318 319 #define DQ_TIMO_INIT 2 320 321 /* 322 * Struct to hold records of network addresses that are allowed to log 323 * to us. 324 */ 325 struct allowedpeer { 326 int isnumeric; 327 u_short port; 328 union { 329 struct { 330 struct sockaddr_storage addr; 331 struct sockaddr_storage mask; 332 } numeric; 333 char *name; 334 } u; 335 #define a_addr u.numeric.addr 336 #define a_mask u.numeric.mask 337 #define a_name u.name 338 STAILQ_ENTRY(allowedpeer) next; 339 }; 340 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 341 342 343 /* 344 * Intervals at which we flush out "message repeated" messages, 345 * in seconds after previous message is logged. After each flush, 346 * we move to the next interval until we reach the largest. 347 */ 348 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 349 #define MAXREPEAT (nitems(repeatinterval) - 1) 350 #define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 351 #define BACKOFF(f) do { \ 352 if (++(f)->f_repeatcount > MAXREPEAT) \ 353 (f)->f_repeatcount = MAXREPEAT; \ 354 } while (0) 355 356 /* values for f_type */ 357 #define F_UNUSED 0 /* unused entry */ 358 #define F_FILE 1 /* regular file */ 359 #define F_TTY 2 /* terminal */ 360 #define F_CONSOLE 3 /* console terminal */ 361 #define F_FORW 4 /* remote machine */ 362 #define F_USERS 5 /* list of users */ 363 #define F_WALL 6 /* everyone logged on */ 364 #define F_PIPE 7 /* pipe to program */ 365 366 static const char *TypeNames[] = { 367 "UNUSED", "FILE", "TTY", "CONSOLE", 368 "FORW", "USERS", "WALL", "PIPE" 369 }; 370 371 static STAILQ_HEAD(, filed) fhead = 372 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 373 static struct filed consfile; /* Console */ 374 375 static int Debug; /* debug flag */ 376 static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 377 static int resolve = 1; /* resolve hostname */ 378 static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 379 static const char *LocalDomain; /* our local domain name */ 380 static int Initialized; /* set when we have initialized ourselves */ 381 static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 382 static int MarkSeq; /* mark sequence number */ 383 static int NoBind; /* don't bind() as suggested by RFC 3164 */ 384 static int SecureMode; /* when true, receive only unix domain socks */ 385 static int MaxForwardLen = 1024; /* max length of forwared message */ 386 #ifdef INET6 387 static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 388 #else 389 static int family = PF_INET; /* protocol family (IPv4 only) */ 390 #endif 391 static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 392 static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 393 static int use_bootfile; /* log entire bootfile for every kern msg */ 394 static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 395 static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 396 397 static char bootfile[MAXPATHLEN]; /* booted kernel file */ 398 399 static int RemoteAddDate; /* Always set the date on remote messages */ 400 static int RemoteHostname; /* Log remote hostname from the message */ 401 402 static int UniquePriority; /* Only log specified priority? */ 403 static int LogFacPri; /* Put facility and priority in log message: */ 404 /* 0=no, 1=numeric, 2=names */ 405 static int KeepKernFac; /* Keep remotely logged kernel facility */ 406 static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 407 static struct pidfh *pfh; 408 static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 409 static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ 410 411 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 412 413 struct iovlist; 414 415 static int allowaddr(char *); 416 static int addfile(struct filed *); 417 static int addpeer(struct peer *); 418 static int addsock(struct addrinfo *, struct socklist *); 419 static struct filed *cfline(const char *, const char *, const char *, 420 const char *); 421 static const char *cvthname(struct sockaddr *); 422 static void deadq_enter(pid_t, const char *); 423 static int deadq_remove(struct deadq_entry *); 424 static int deadq_removebypid(pid_t); 425 static int decode(const char *, const CODE *); 426 static void die(int) __dead2; 427 static void dodie(int); 428 static void dofsync(void); 429 static void domark(int); 430 static void fprintlog_first(struct filed *, const char *, const char *, 431 const char *, const char *, const char *, const char *, int); 432 static void fprintlog_write(struct filed *, struct iovlist *, int); 433 static void fprintlog_successive(struct filed *, int); 434 static void init(int); 435 static void logerror(const char *); 436 static void logmsg(int, const struct logtime *, const char *, const char *, 437 const char *, const char *, const char *, const char *, int); 438 static void log_deadchild(pid_t, int, const char *); 439 static void markit(void); 440 static int socksetup(struct peer *); 441 static int socklist_recv_file(struct socklist *); 442 static int socklist_recv_sock(struct socklist *); 443 static int socklist_recv_signal(struct socklist *); 444 static void sighandler(int); 445 static int skip_message(const char *, const char *, int); 446 static int evaluate_prop_filter(const struct prop_filter *filter, 447 const char *value); 448 static int prop_filter_compile(struct prop_filter *pfilter, 449 char *filterstr); 450 static void parsemsg(const char *, char *); 451 static void printsys(char *); 452 static int p_open(const char *, pid_t *); 453 static void reapchild(int); 454 static const char *ttymsg_check(struct iovec *, int, char *, int); 455 static void usage(void); 456 static int validate(struct sockaddr *, const char *); 457 static void unmapped(struct sockaddr *); 458 static void wallmsg(struct filed *, struct iovec *, const int iovlen); 459 static int waitdaemon(int); 460 static void timedout(int); 461 static void increase_rcvbuf(int); 462 463 static void 464 close_filed(struct filed *f) 465 { 466 467 if (f == NULL || f->f_file == -1) 468 return; 469 470 switch (f->f_type) { 471 case F_FORW: 472 if (f->fu_forw_addr != NULL) { 473 freeaddrinfo(f->fu_forw_addr); 474 f->fu_forw_addr = NULL; 475 } 476 /* FALLTHROUGH */ 477 478 case F_FILE: 479 case F_TTY: 480 case F_CONSOLE: 481 f->f_type = F_UNUSED; 482 break; 483 case F_PIPE: 484 f->fu_pipe_pid = 0; 485 break; 486 } 487 (void)close(f->f_file); 488 f->f_file = -1; 489 } 490 491 static int 492 addfile(struct filed *f0) 493 { 494 struct filed *f; 495 496 f = calloc(1, sizeof(*f)); 497 if (f == NULL) 498 err(1, "malloc failed"); 499 *f = *f0; 500 STAILQ_INSERT_TAIL(&fhead, f, next); 501 502 return (0); 503 } 504 505 static int 506 addpeer(struct peer *pe0) 507 { 508 struct peer *pe; 509 510 pe = calloc(1, sizeof(*pe)); 511 if (pe == NULL) 512 err(1, "malloc failed"); 513 *pe = *pe0; 514 STAILQ_INSERT_TAIL(&pqueue, pe, next); 515 516 return (0); 517 } 518 519 static int 520 addsock(struct addrinfo *ai, struct socklist *sl0) 521 { 522 struct socklist *sl; 523 524 /* Copy *ai->ai_addr to the tail of struct socklist if any. */ 525 sl = calloc(1, sizeof(*sl) + ((ai != NULL) ? ai->ai_addrlen : 0)); 526 if (sl == NULL) 527 err(1, "malloc failed"); 528 *sl = *sl0; 529 if (ai != NULL) { 530 memcpy(&sl->sl_ai, ai, sizeof(*ai)); 531 if (ai->ai_addrlen > 0) { 532 memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); 533 sl->sl_sa = (struct sockaddr *)(sl + 1); 534 } else 535 sl->sl_sa = NULL; 536 } 537 STAILQ_INSERT_TAIL(&shead, sl, next); 538 539 return (0); 540 } 541 542 int 543 main(int argc, char *argv[]) 544 { 545 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 546 fd_set *fdsr = NULL; 547 struct timeval tv, *tvp; 548 struct peer *pe; 549 struct socklist *sl; 550 pid_t ppid = 1, spid; 551 char *p; 552 553 if (madvise(NULL, 0, MADV_PROTECT) != 0) 554 dprintf("madvise() failed: %s\n", strerror(errno)); 555 556 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) 557 != -1) 558 switch (ch) { 559 #ifdef INET 560 case '4': 561 family = PF_INET; 562 break; 563 #endif 564 #ifdef INET6 565 case '6': 566 family = PF_INET6; 567 break; 568 #endif 569 case '8': 570 mask_C1 = 0; 571 break; 572 case 'A': 573 send_to_all++; 574 break; 575 case 'a': /* allow specific network addresses only */ 576 if (allowaddr(optarg) == -1) 577 usage(); 578 break; 579 case 'b': 580 bflag = 1; 581 p = strchr(optarg, ']'); 582 if (p != NULL) 583 p = strchr(p + 1, ':'); 584 else { 585 p = strchr(optarg, ':'); 586 if (p != NULL && strchr(p + 1, ':') != NULL) 587 p = NULL; /* backward compatibility */ 588 } 589 if (p == NULL) { 590 /* A hostname or filename only. */ 591 addpeer(&(struct peer){ 592 .pe_name = optarg, 593 .pe_serv = "syslog" 594 }); 595 } else { 596 /* The case of "name:service". */ 597 *p++ = '\0'; 598 addpeer(&(struct peer){ 599 .pe_serv = p, 600 .pe_name = (strlen(optarg) == 0) ? 601 NULL : optarg, 602 }); 603 } 604 break; 605 case 'c': 606 no_compress++; 607 break; 608 case 'C': 609 logflags |= O_CREAT; 610 break; 611 case 'd': /* debug */ 612 Debug++; 613 break; 614 case 'f': /* configuration file */ 615 ConfFile = optarg; 616 break; 617 case 'F': /* run in foreground instead of daemon */ 618 Foreground++; 619 break; 620 case 'H': 621 RemoteHostname = 1; 622 break; 623 case 'k': /* keep remote kern fac */ 624 KeepKernFac = 1; 625 break; 626 case 'l': 627 case 'p': 628 case 'S': 629 { 630 long perml; 631 mode_t mode; 632 char *name, *ep; 633 634 if (ch == 'l') 635 mode = DEFFILEMODE; 636 else if (ch == 'p') { 637 mode = DEFFILEMODE; 638 pflag = 1; 639 } else { 640 mode = S_IRUSR | S_IWUSR; 641 Sflag = 1; 642 } 643 if (optarg[0] == '/') 644 name = optarg; 645 else if ((name = strchr(optarg, ':')) != NULL) { 646 *name++ = '\0'; 647 if (name[0] != '/') 648 errx(1, "socket name must be absolute " 649 "path"); 650 if (isdigit(*optarg)) { 651 perml = strtol(optarg, &ep, 8); 652 if (*ep || perml < 0 || 653 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 654 errx(1, "invalid mode %s, exiting", 655 optarg); 656 mode = (mode_t )perml; 657 } else 658 errx(1, "invalid mode %s, exiting", 659 optarg); 660 } else 661 errx(1, "invalid filename %s, exiting", 662 optarg); 663 addpeer(&(struct peer){ 664 .pe_name = name, 665 .pe_mode = mode 666 }); 667 break; 668 } 669 case 'M': /* max length of forwarded message */ 670 MaxForwardLen = atoi(optarg); 671 if (MaxForwardLen < 480) 672 errx(1, "minimum length limit of forwarded " 673 "messages is 480 bytes"); 674 break; 675 case 'm': /* mark interval */ 676 MarkInterval = atoi(optarg) * 60; 677 break; 678 case 'N': 679 NoBind = 1; 680 SecureMode = 1; 681 break; 682 case 'n': 683 resolve = 0; 684 break; 685 case 'O': 686 if (strcmp(optarg, "bsd") == 0 || 687 strcmp(optarg, "rfc3164") == 0) 688 RFC3164OutputFormat = true; 689 else if (strcmp(optarg, "syslog") == 0 || 690 strcmp(optarg, "rfc5424") == 0) 691 RFC3164OutputFormat = false; 692 else 693 usage(); 694 break; 695 case 'o': 696 use_bootfile = 1; 697 break; 698 case 'P': /* path for alt. PID */ 699 PidFile = optarg; 700 break; 701 case 's': /* no network mode */ 702 SecureMode++; 703 break; 704 case 'T': 705 RemoteAddDate = 1; 706 break; 707 case 'u': /* only log specified priority */ 708 UniquePriority++; 709 break; 710 case 'v': /* log facility and priority */ 711 LogFacPri++; 712 break; 713 default: 714 usage(); 715 } 716 if ((argc -= optind) != 0) 717 usage(); 718 719 if (RFC3164OutputFormat && MaxForwardLen > 1024) 720 errx(1, "RFC 3164 messages may not exceed 1024 bytes"); 721 722 /* Pipe to catch a signal during select(). */ 723 s = pipe2(sigpipe, O_CLOEXEC); 724 if (s < 0) { 725 err(1, "cannot open a pipe for signals"); 726 } else { 727 addsock(NULL, &(struct socklist){ 728 .sl_socket = sigpipe[0], 729 .sl_recv = socklist_recv_signal 730 }); 731 } 732 733 /* Listen by default: /dev/klog. */ 734 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 735 if (s < 0) { 736 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 737 } else { 738 addsock(NULL, &(struct socklist){ 739 .sl_socket = s, 740 .sl_recv = socklist_recv_file, 741 }); 742 } 743 /* Listen by default: *:514 if no -b flag. */ 744 if (bflag == 0) 745 addpeer(&(struct peer){ 746 .pe_serv = "syslog" 747 }); 748 /* Listen by default: /var/run/log if no -p flag. */ 749 if (pflag == 0) 750 addpeer(&(struct peer){ 751 .pe_name = _PATH_LOG, 752 .pe_mode = DEFFILEMODE, 753 }); 754 /* Listen by default: /var/run/logpriv if no -S flag. */ 755 if (Sflag == 0) 756 addpeer(&(struct peer){ 757 .pe_name = _PATH_LOG_PRIV, 758 .pe_mode = S_IRUSR | S_IWUSR, 759 }); 760 STAILQ_FOREACH(pe, &pqueue, next) 761 socksetup(pe); 762 763 pfh = pidfile_open(PidFile, 0600, &spid); 764 if (pfh == NULL) { 765 if (errno == EEXIST) 766 errx(1, "syslogd already running, pid: %d", spid); 767 warn("cannot open pid file"); 768 } 769 770 if ((!Foreground) && (!Debug)) { 771 ppid = waitdaemon(30); 772 if (ppid < 0) { 773 warn("could not become daemon"); 774 pidfile_remove(pfh); 775 exit(1); 776 } 777 } else if (Debug) 778 setlinebuf(stdout); 779 780 consfile.f_type = F_CONSOLE; 781 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 782 sizeof(consfile.fu_fname)); 783 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 784 (void)signal(SIGTERM, dodie); 785 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 786 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 787 (void)signal(SIGHUP, sighandler); 788 (void)signal(SIGCHLD, sighandler); 789 (void)signal(SIGALRM, domark); 790 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 791 (void)alarm(TIMERINTVL); 792 793 /* tuck my process id away */ 794 pidfile_write(pfh); 795 796 dprintf("off & running....\n"); 797 798 tvp = &tv; 799 tv.tv_sec = tv.tv_usec = 0; 800 801 STAILQ_FOREACH(sl, &shead, next) { 802 if (sl->sl_socket > fdsrmax) 803 fdsrmax = sl->sl_socket; 804 } 805 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 806 sizeof(*fdsr)); 807 if (fdsr == NULL) 808 errx(1, "calloc fd_set"); 809 810 for (;;) { 811 if (Initialized == 0) 812 init(0); 813 else if (WantInitialize) 814 init(WantInitialize); 815 if (WantReapchild) 816 reapchild(WantReapchild); 817 if (MarkSet) 818 markit(); 819 if (WantDie) { 820 free(fdsr); 821 die(WantDie); 822 } 823 824 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 825 sizeof(*fdsr)); 826 827 STAILQ_FOREACH(sl, &shead, next) { 828 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 829 FD_SET(sl->sl_socket, fdsr); 830 } 831 i = select(fdsrmax + 1, fdsr, NULL, NULL, 832 needdofsync ? &tv : tvp); 833 switch (i) { 834 case 0: 835 dofsync(); 836 needdofsync = 0; 837 if (tvp) { 838 tvp = NULL; 839 if (ppid != 1) 840 kill(ppid, SIGALRM); 841 } 842 continue; 843 case -1: 844 if (errno != EINTR) 845 logerror("select"); 846 continue; 847 } 848 STAILQ_FOREACH(sl, &shead, next) { 849 if (FD_ISSET(sl->sl_socket, fdsr)) 850 (*sl->sl_recv)(sl); 851 } 852 } 853 free(fdsr); 854 } 855 856 static int 857 socklist_recv_signal(struct socklist *sl __unused) 858 { 859 ssize_t len; 860 int i, nsig, signo; 861 862 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 863 logerror("ioctl(FIONREAD)"); 864 err(1, "signal pipe read failed"); 865 } 866 nsig = i / sizeof(signo); 867 dprintf("# of received signals = %d\n", nsig); 868 for (i = 0; i < nsig; i++) { 869 len = read(sigpipe[0], &signo, sizeof(signo)); 870 if (len != sizeof(signo)) { 871 logerror("signal pipe read failed"); 872 err(1, "signal pipe read failed"); 873 } 874 dprintf("Received signal: %d from fd=%d\n", signo, 875 sigpipe[0]); 876 switch (signo) { 877 case SIGHUP: 878 WantInitialize = 1; 879 break; 880 case SIGCHLD: 881 WantReapchild = 1; 882 break; 883 } 884 } 885 return (0); 886 } 887 888 static int 889 socklist_recv_sock(struct socklist *sl) 890 { 891 struct sockaddr_storage ss; 892 struct sockaddr *sa = (struct sockaddr *)&ss; 893 socklen_t sslen; 894 const char *hname; 895 char line[MAXLINE + 1]; 896 int len; 897 898 sslen = sizeof(ss); 899 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 900 dprintf("received sa_len = %d\n", sslen); 901 if (len == 0) 902 return (-1); 903 if (len < 0) { 904 if (errno != EINTR) 905 logerror("recvfrom"); 906 return (-1); 907 } 908 /* Received valid data. */ 909 line[len] = '\0'; 910 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 911 hname = LocalHostName; 912 else { 913 hname = cvthname(sa); 914 unmapped(sa); 915 if (validate(sa, hname) == 0) { 916 dprintf("Message from %s was ignored.", hname); 917 return (-1); 918 } 919 } 920 parsemsg(hname, line); 921 922 return (0); 923 } 924 925 static void 926 unmapped(struct sockaddr *sa) 927 { 928 #if defined(INET) && defined(INET6) 929 struct sockaddr_in6 *sin6; 930 struct sockaddr_in sin; 931 932 if (sa == NULL || 933 sa->sa_family != AF_INET6 || 934 sa->sa_len != sizeof(*sin6)) 935 return; 936 sin6 = satosin6(sa); 937 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 938 return; 939 sin = (struct sockaddr_in){ 940 .sin_family = AF_INET, 941 .sin_len = sizeof(sin), 942 .sin_port = sin6->sin6_port 943 }; 944 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 945 sizeof(sin.sin_addr)); 946 memcpy(sa, &sin, sizeof(sin)); 947 #else 948 if (sa == NULL) 949 return; 950 #endif 951 } 952 953 static void 954 usage(void) 955 { 956 957 fprintf(stderr, 958 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 959 " [-b bind_address] [-f config_file]\n" 960 " [-l [mode:]path] [-M fwd_length]\n" 961 " [-m mark_interval] [-O format] [-P pid_file]\n" 962 " [-p log_socket] [-S logpriv_socket]\n"); 963 exit(1); 964 } 965 966 /* 967 * Removes characters from log messages that are unsafe to display. 968 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 969 */ 970 static void 971 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 972 { 973 char *q; 974 int c; 975 976 q = out; 977 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 978 if (mask_C1 && (c & 0x80) && c < 0xA0) { 979 c &= 0x7F; 980 *q++ = 'M'; 981 *q++ = '-'; 982 } 983 if (isascii(c) && iscntrl(c)) { 984 if (c == '\n') { 985 *q++ = ' '; 986 } else if (c == '\t') { 987 *q++ = '\t'; 988 } else { 989 *q++ = '^'; 990 *q++ = c ^ 0100; 991 } 992 } else { 993 *q++ = c; 994 } 995 } 996 *q = '\0'; 997 } 998 999 /* 1000 * Parses a syslog message according to RFC 5424, assuming that PRI and 1001 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 1002 * parsed result is passed to logmsg(). 1003 */ 1004 static void 1005 parsemsg_rfc5424(const char *from, int pri, char *msg) 1006 { 1007 const struct logtime *timestamp; 1008 struct logtime timestamp_remote; 1009 const char *omsg, *hostname, *app_name, *procid, *msgid, 1010 *structured_data; 1011 char line[MAXLINE + 1]; 1012 1013 #define FAIL_IF(field, expr) do { \ 1014 if (expr) { \ 1015 dprintf("Failed to parse " field " from %s: %s\n", \ 1016 from, omsg); \ 1017 return; \ 1018 } \ 1019 } while (0) 1020 #define PARSE_CHAR(field, sep) do { \ 1021 FAIL_IF(field, *msg != sep); \ 1022 ++msg; \ 1023 } while (0) 1024 #define IF_NOT_NILVALUE(var) \ 1025 if (msg[0] == '-' && msg[1] == ' ') { \ 1026 msg += 2; \ 1027 var = NULL; \ 1028 } else if (msg[0] == '-' && msg[1] == '\0') { \ 1029 ++msg; \ 1030 var = NULL; \ 1031 } else 1032 1033 omsg = msg; 1034 IF_NOT_NILVALUE(timestamp) { 1035 /* Parse RFC 3339-like timestamp. */ 1036 #define PARSE_NUMBER(dest, length, min, max) do { \ 1037 int i, v; \ 1038 \ 1039 v = 0; \ 1040 for (i = 0; i < length; ++i) { \ 1041 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 1042 v = v * 10 + *msg++ - '0'; \ 1043 } \ 1044 FAIL_IF("TIMESTAMP", v < min || v > max); \ 1045 dest = v; \ 1046 } while (0) 1047 /* Date and time. */ 1048 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 1049 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 1050 timestamp_remote.tm.tm_year -= 1900; 1051 PARSE_CHAR("TIMESTAMP", '-'); 1052 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 1053 --timestamp_remote.tm.tm_mon; 1054 PARSE_CHAR("TIMESTAMP", '-'); 1055 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 1056 PARSE_CHAR("TIMESTAMP", 'T'); 1057 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 1058 PARSE_CHAR("TIMESTAMP", ':'); 1059 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1060 PARSE_CHAR("TIMESTAMP", ':'); 1061 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1062 /* Perform normalization. */ 1063 timegm(×tamp_remote.tm); 1064 /* Optional: fractional seconds. */ 1065 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1066 int i; 1067 1068 ++msg; 1069 for (i = 100000; i != 0; i /= 10) { 1070 if (*msg < '0' || *msg > '9') 1071 break; 1072 timestamp_remote.usec += (*msg++ - '0') * i; 1073 } 1074 } 1075 /* Timezone. */ 1076 if (*msg == 'Z') { 1077 /* UTC. */ 1078 ++msg; 1079 } else { 1080 int sign, tz_hour, tz_min; 1081 1082 /* Local time zone offset. */ 1083 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1084 sign = *msg++ == '-' ? -1 : 1; 1085 PARSE_NUMBER(tz_hour, 2, 0, 23); 1086 PARSE_CHAR("TIMESTAMP", ':'); 1087 PARSE_NUMBER(tz_min, 2, 0, 59); 1088 timestamp_remote.tm.tm_gmtoff = 1089 sign * (tz_hour * 3600 + tz_min * 60); 1090 } 1091 #undef PARSE_NUMBER 1092 PARSE_CHAR("TIMESTAMP", ' '); 1093 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1094 } 1095 1096 /* String fields part of the HEADER. */ 1097 #define PARSE_STRING(field, var) \ 1098 IF_NOT_NILVALUE(var) { \ 1099 var = msg; \ 1100 while (*msg >= '!' && *msg <= '~') \ 1101 ++msg; \ 1102 FAIL_IF(field, var == msg); \ 1103 PARSE_CHAR(field, ' '); \ 1104 msg[-1] = '\0'; \ 1105 } 1106 PARSE_STRING("HOSTNAME", hostname); 1107 if (hostname == NULL || !RemoteHostname) 1108 hostname = from; 1109 PARSE_STRING("APP-NAME", app_name); 1110 PARSE_STRING("PROCID", procid); 1111 PARSE_STRING("MSGID", msgid); 1112 #undef PARSE_STRING 1113 1114 /* Structured data. */ 1115 #define PARSE_SD_NAME() do { \ 1116 const char *start; \ 1117 \ 1118 start = msg; \ 1119 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1120 *msg != ']' && *msg != '"') \ 1121 ++msg; \ 1122 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1123 } while (0) 1124 IF_NOT_NILVALUE(structured_data) { 1125 /* SD-ELEMENT. */ 1126 while (*msg == '[') { 1127 ++msg; 1128 /* SD-ID. */ 1129 PARSE_SD_NAME(); 1130 /* SD-PARAM. */ 1131 while (*msg == ' ') { 1132 ++msg; 1133 /* PARAM-NAME. */ 1134 PARSE_SD_NAME(); 1135 PARSE_CHAR("STRUCTURED-NAME", '='); 1136 PARSE_CHAR("STRUCTURED-NAME", '"'); 1137 while (*msg != '"') { 1138 FAIL_IF("STRUCTURED-NAME", 1139 *msg == '\0'); 1140 if (*msg++ == '\\') { 1141 FAIL_IF("STRUCTURED-NAME", 1142 *msg == '\0'); 1143 ++msg; 1144 } 1145 } 1146 ++msg; 1147 } 1148 PARSE_CHAR("STRUCTURED-NAME", ']'); 1149 } 1150 PARSE_CHAR("STRUCTURED-NAME", ' '); 1151 msg[-1] = '\0'; 1152 } 1153 #undef PARSE_SD_NAME 1154 1155 #undef FAIL_IF 1156 #undef PARSE_CHAR 1157 #undef IF_NOT_NILVALUE 1158 1159 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1160 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1161 structured_data, line, 0); 1162 } 1163 1164 /* 1165 * Returns the length of the application name ("TAG" in RFC 3164 1166 * terminology) and process ID from a message if present. 1167 */ 1168 static void 1169 parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, 1170 ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) 1171 { 1172 const char *m, *procid_begin; 1173 size_t app_name_length, procid_length; 1174 1175 m = msg; 1176 1177 /* Application name. */ 1178 app_name_length = strspn(m, 1179 "abcdefghijklmnopqrstuvwxyz" 1180 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1181 "0123456789" 1182 "_-/"); 1183 if (app_name_length == 0) 1184 goto bad; 1185 m += app_name_length; 1186 1187 /* Process identifier (optional). */ 1188 if (*m == '[') { 1189 procid_begin = ++m; 1190 procid_length = strspn(m, "0123456789"); 1191 if (procid_length == 0) 1192 goto bad; 1193 m += procid_length; 1194 if (*m++ != ']') 1195 goto bad; 1196 } else { 1197 procid_begin = NULL; 1198 procid_length = 0; 1199 } 1200 1201 /* Separator. */ 1202 if (m[0] != ':' || m[1] != ' ') 1203 goto bad; 1204 1205 *app_name_length_p = app_name_length; 1206 if (procid_begin_offset_p != NULL) 1207 *procid_begin_offset_p = 1208 procid_begin == NULL ? 0 : procid_begin - msg; 1209 if (procid_length_p != NULL) 1210 *procid_length_p = procid_length; 1211 return; 1212 bad: 1213 *app_name_length_p = 0; 1214 if (procid_begin_offset_p != NULL) 1215 *procid_begin_offset_p = 0; 1216 if (procid_length_p != NULL) 1217 *procid_length_p = 0; 1218 } 1219 1220 /* 1221 * Trims the application name ("TAG" in RFC 3164 terminology) and 1222 * process ID from a message if present. 1223 */ 1224 static void 1225 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1226 const char **procid) 1227 { 1228 char *m, *app_name_begin, *procid_begin; 1229 size_t app_name_length, procid_length; 1230 ptrdiff_t procid_begin_offset; 1231 1232 m = *msg; 1233 app_name_begin = m; 1234 1235 parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, 1236 &procid_begin_offset, &procid_length); 1237 if (app_name_length == 0) 1238 goto bad; 1239 procid_begin = procid_begin_offset == 0 ? NULL : 1240 app_name_begin + procid_begin_offset; 1241 1242 /* Split strings from input. */ 1243 app_name_begin[app_name_length] = '\0'; 1244 m += app_name_length + 1; 1245 if (procid_begin != NULL) { 1246 procid_begin[procid_length] = '\0'; 1247 m += procid_length + 2; 1248 } 1249 1250 *msg = m + 1; 1251 *app_name = app_name_begin; 1252 *procid = procid_begin; 1253 return; 1254 bad: 1255 *app_name = NULL; 1256 *procid = NULL; 1257 } 1258 1259 /* 1260 * Parses a syslog message according to RFC 3164, assuming that PRI 1261 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1262 * result is passed to logmsg(). 1263 */ 1264 static void 1265 parsemsg_rfc3164(const char *from, int pri, char *msg) 1266 { 1267 struct tm tm_parsed; 1268 const struct logtime *timestamp; 1269 struct logtime timestamp_remote; 1270 const char *app_name, *procid; 1271 size_t i, msglen; 1272 char line[MAXLINE + 1]; 1273 1274 /* 1275 * Parse the TIMESTAMP provided by the remote side. If none is 1276 * found, assume this is not an RFC 3164 formatted message, 1277 * only containing a TAG and a MSG. 1278 */ 1279 timestamp = NULL; 1280 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1281 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1282 msg += RFC3164_DATELEN + 1; 1283 if (!RemoteAddDate) { 1284 struct tm tm_now; 1285 time_t t_now; 1286 int year; 1287 1288 /* 1289 * As the timestamp does not contain the year 1290 * number, daylight saving time information, nor 1291 * a time zone, attempt to infer it. Due to 1292 * clock skews, the timestamp may even be part 1293 * of the next year. Use the last year for which 1294 * the timestamp is at most one week in the 1295 * future. 1296 * 1297 * This loop can only run for at most three 1298 * iterations before terminating. 1299 */ 1300 t_now = time(NULL); 1301 localtime_r(&t_now, &tm_now); 1302 for (year = tm_now.tm_year + 1;; --year) { 1303 assert(year >= tm_now.tm_year - 1); 1304 timestamp_remote.tm = tm_parsed; 1305 timestamp_remote.tm.tm_year = year; 1306 timestamp_remote.tm.tm_isdst = -1; 1307 timestamp_remote.usec = 0; 1308 if (mktime(×tamp_remote.tm) < 1309 t_now + 7 * 24 * 60 * 60) 1310 break; 1311 } 1312 timestamp = ×tamp_remote; 1313 } 1314 1315 /* 1316 * A single space character MUST also follow the HOSTNAME field. 1317 */ 1318 msglen = strlen(msg); 1319 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1320 if (msg[i] == ' ') { 1321 if (RemoteHostname) { 1322 msg[i] = '\0'; 1323 from = msg; 1324 } 1325 msg += i + 1; 1326 break; 1327 } 1328 /* 1329 * Support non RFC compliant messages, without hostname. 1330 */ 1331 if (msg[i] == ':') 1332 break; 1333 } 1334 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1335 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1336 return; 1337 } 1338 } 1339 1340 /* Remove the TAG, if present. */ 1341 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1342 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1343 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1344 } 1345 1346 /* 1347 * Takes a raw input line, extracts PRI and determines whether the 1348 * message is formatted according to RFC 3164 or RFC 5424. Continues 1349 * parsing of addition fields in the message according to those 1350 * standards and prints the message on the appropriate log files. 1351 */ 1352 static void 1353 parsemsg(const char *from, char *msg) 1354 { 1355 char *q; 1356 long n; 1357 size_t i; 1358 int pri; 1359 1360 /* Parse PRI. */ 1361 if (msg[0] != '<' || !isdigit(msg[1])) { 1362 dprintf("Invalid PRI from %s\n", from); 1363 return; 1364 } 1365 for (i = 2; i <= 4; i++) { 1366 if (msg[i] == '>') 1367 break; 1368 if (!isdigit(msg[i])) { 1369 dprintf("Invalid PRI header from %s\n", from); 1370 return; 1371 } 1372 } 1373 if (msg[i] != '>') { 1374 dprintf("Invalid PRI header from %s\n", from); 1375 return; 1376 } 1377 errno = 0; 1378 n = strtol(msg + 1, &q, 10); 1379 if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) { 1380 dprintf("Invalid PRI %ld from %s: %s\n", 1381 n, from, strerror(errno)); 1382 return; 1383 } 1384 pri = n; 1385 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1386 pri = DEFUPRI; 1387 1388 /* 1389 * Don't allow users to log kernel messages. 1390 * NOTE: since LOG_KERN == 0 this will also match 1391 * messages with no facility specified. 1392 */ 1393 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1394 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1395 1396 /* Parse VERSION. */ 1397 msg += i + 1; 1398 if (msg[0] == '1' && msg[1] == ' ') 1399 parsemsg_rfc5424(from, pri, msg + 2); 1400 else 1401 parsemsg_rfc3164(from, pri, msg); 1402 } 1403 1404 /* 1405 * Read /dev/klog while data are available, split into lines. 1406 */ 1407 static int 1408 socklist_recv_file(struct socklist *sl) 1409 { 1410 char *p, *q, line[MAXLINE + 1]; 1411 int len, i; 1412 1413 len = 0; 1414 for (;;) { 1415 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1416 if (i > 0) { 1417 line[i + len] = '\0'; 1418 } else { 1419 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1420 logerror("klog"); 1421 close(sl->sl_socket); 1422 sl->sl_socket = -1; 1423 } 1424 break; 1425 } 1426 1427 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1428 *q = '\0'; 1429 printsys(p); 1430 } 1431 len = strlen(p); 1432 if (len >= MAXLINE - 1) { 1433 printsys(p); 1434 len = 0; 1435 } 1436 if (len > 0) 1437 memmove(line, p, len + 1); 1438 } 1439 if (len > 0) 1440 printsys(line); 1441 1442 return (len); 1443 } 1444 1445 /* 1446 * Take a raw input line from /dev/klog, format similar to syslog(). 1447 */ 1448 static void 1449 printsys(char *msg) 1450 { 1451 char *p, *q; 1452 long n; 1453 int flags, isprintf, pri; 1454 1455 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1456 p = msg; 1457 pri = DEFSPRI; 1458 isprintf = 1; 1459 if (*p == '<') { 1460 errno = 0; 1461 n = strtol(p + 1, &q, 10); 1462 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1463 p = q + 1; 1464 pri = n; 1465 isprintf = 0; 1466 } 1467 } 1468 /* 1469 * Kernel printf's and LOG_CONSOLE messages have been displayed 1470 * on the console already. 1471 */ 1472 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1473 flags |= IGN_CONS; 1474 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1475 pri = DEFSPRI; 1476 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1477 } 1478 1479 static time_t now; 1480 1481 /* 1482 * Match a program or host name against a specification. 1483 * Return a non-0 value if the message must be ignored 1484 * based on the specification. 1485 */ 1486 static int 1487 skip_message(const char *name, const char *spec, int checkcase) 1488 { 1489 const char *s; 1490 char prev, next; 1491 int exclude = 0; 1492 /* Behaviour on explicit match */ 1493 1494 if (spec == NULL) 1495 return 0; 1496 switch (*spec) { 1497 case '-': 1498 exclude = 1; 1499 /*FALLTHROUGH*/ 1500 case '+': 1501 spec++; 1502 break; 1503 default: 1504 break; 1505 } 1506 if (checkcase) 1507 s = strstr (spec, name); 1508 else 1509 s = strcasestr (spec, name); 1510 1511 if (s != NULL) { 1512 prev = (s == spec ? ',' : *(s - 1)); 1513 next = *(s + strlen (name)); 1514 1515 if (prev == ',' && (next == '\0' || next == ',')) 1516 /* Explicit match: skip iff the spec is an 1517 exclusive one. */ 1518 return exclude; 1519 } 1520 1521 /* No explicit match for this name: skip the message iff 1522 the spec is an inclusive one. */ 1523 return !exclude; 1524 } 1525 1526 /* 1527 * Match some property of the message against a filter. 1528 * Return a non-0 value if the message must be ignored 1529 * based on the filter. 1530 */ 1531 static int 1532 evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1533 { 1534 const char *s = NULL; 1535 const int exclude = ((filter->cmp_flags & PROP_FLAG_EXCLUDE) > 0); 1536 size_t valuelen; 1537 1538 if (value == NULL) 1539 return (-1); 1540 1541 if (filter->cmp_type == PROP_CMP_REGEX) { 1542 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1543 return (exclude); 1544 else 1545 return (!exclude); 1546 } 1547 1548 valuelen = strlen(value); 1549 1550 /* a shortcut for equal with different length is always false */ 1551 if (filter->cmp_type == PROP_CMP_EQUAL && 1552 valuelen != filter->pflt_strlen) 1553 return (!exclude); 1554 1555 if (filter->cmp_flags & PROP_FLAG_ICASE) 1556 s = strcasestr(value, filter->pflt_strval); 1557 else 1558 s = strstr(value, filter->pflt_strval); 1559 1560 /* 1561 * PROP_CMP_CONTAINS true if s 1562 * PROP_CMP_STARTS true if s && s == value 1563 * PROP_CMP_EQUAL true if s && s == value && 1564 * valuelen == filter->pflt_strlen 1565 * (and length match is checked 1566 * already) 1567 */ 1568 1569 switch (filter->cmp_type) { 1570 case PROP_CMP_STARTS: 1571 case PROP_CMP_EQUAL: 1572 if (s != value) 1573 return (!exclude); 1574 /* FALLTHROUGH */ 1575 case PROP_CMP_CONTAINS: 1576 if (s) 1577 return (exclude); 1578 else 1579 return (!exclude); 1580 break; 1581 default: 1582 /* unknown cmp_type */ 1583 break; 1584 } 1585 1586 return (-1); 1587 } 1588 1589 /* 1590 * Logs a message to the appropriate log files, users, etc. based on the 1591 * priority. Log messages are always formatted according to RFC 3164, 1592 * even if they were in RFC 5424 format originally, The MSGID and 1593 * STRUCTURED-DATA fields are thus discarded for the time being. 1594 */ 1595 static void 1596 logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1597 const char *app_name, const char *procid, const char *msgid, 1598 const char *structured_data, const char *msg, int flags) 1599 { 1600 struct timeval tv; 1601 struct logtime timestamp_now; 1602 struct filed *f; 1603 size_t savedlen; 1604 int fac, prilev; 1605 char saved[MAXSVLINE], kernel_app_name[100]; 1606 1607 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1608 pri, flags, hostname, msg); 1609 1610 (void)gettimeofday(&tv, NULL); 1611 now = tv.tv_sec; 1612 if (timestamp == NULL) { 1613 localtime_r(&now, ×tamp_now.tm); 1614 timestamp_now.usec = tv.tv_usec; 1615 timestamp = ×tamp_now; 1616 } 1617 1618 /* extract facility and priority level */ 1619 if (flags & MARK) 1620 fac = LOG_NFACILITIES; 1621 else 1622 fac = LOG_FAC(pri); 1623 1624 /* Check maximum facility number. */ 1625 if (fac > LOG_NFACILITIES) 1626 return; 1627 1628 prilev = LOG_PRI(pri); 1629 1630 /* 1631 * Lookup kernel app name from log prefix if present. 1632 * This is only used for local program specification matching. 1633 */ 1634 if (flags & ISKERNEL) { 1635 size_t kernel_app_name_length; 1636 1637 parsemsg_rfc3164_get_app_name_procid(msg, 1638 &kernel_app_name_length, NULL, NULL); 1639 if (kernel_app_name_length != 0) { 1640 strlcpy(kernel_app_name, msg, 1641 MIN(sizeof(kernel_app_name), 1642 kernel_app_name_length + 1)); 1643 } else 1644 kernel_app_name[0] = '\0'; 1645 } 1646 1647 /* log the message to the particular outputs */ 1648 if (!Initialized) { 1649 f = &consfile; 1650 /* 1651 * Open in non-blocking mode to avoid hangs during open 1652 * and close(waiting for the port to drain). 1653 */ 1654 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1655 1656 if (f->f_file >= 0) { 1657 f->f_lasttime = *timestamp; 1658 fprintlog_first(f, hostname, app_name, procid, msgid, 1659 structured_data, msg, flags); 1660 close(f->f_file); 1661 f->f_file = -1; 1662 } 1663 return; 1664 } 1665 1666 /* 1667 * Store all of the fields of the message, except the timestamp, 1668 * in a single string. This string is used to detect duplicate 1669 * messages. 1670 */ 1671 assert(hostname != NULL); 1672 assert(msg != NULL); 1673 savedlen = snprintf(saved, sizeof(saved), 1674 "%d %s %s %s %s %s %s", pri, hostname, 1675 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1676 msgid == NULL ? "-" : msgid, 1677 structured_data == NULL ? "-" : structured_data, msg); 1678 1679 STAILQ_FOREACH(f, &fhead, next) { 1680 /* skip messages that are incorrect priority */ 1681 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1682 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1683 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1684 ) 1685 || f->f_pmask[fac] == INTERNAL_NOPRI) 1686 continue; 1687 1688 /* skip messages with the incorrect hostname */ 1689 if (skip_message(hostname, f->f_host, 0)) 1690 continue; 1691 1692 /* skip messages with the incorrect program name */ 1693 if (flags & ISKERNEL && kernel_app_name[0] != '\0') { 1694 if (skip_message(kernel_app_name, f->f_program, 1)) 1695 continue; 1696 } else if (skip_message(app_name == NULL ? "" : app_name, 1697 f->f_program, 1)) 1698 continue; 1699 1700 /* skip messages if a property does not match filter */ 1701 if (f->f_prop_filter != NULL && 1702 f->f_prop_filter->prop_type != PROP_TYPE_NOOP) { 1703 switch (f->f_prop_filter->prop_type) { 1704 case PROP_TYPE_MSG: 1705 if (evaluate_prop_filter(f->f_prop_filter, 1706 msg)) 1707 continue; 1708 break; 1709 case PROP_TYPE_HOSTNAME: 1710 if (evaluate_prop_filter(f->f_prop_filter, 1711 hostname)) 1712 continue; 1713 break; 1714 case PROP_TYPE_PROGNAME: 1715 if (evaluate_prop_filter(f->f_prop_filter, 1716 app_name == NULL ? "" : app_name)) 1717 continue; 1718 break; 1719 default: 1720 continue; 1721 } 1722 } 1723 1724 /* skip message to console if it has already been printed */ 1725 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1726 continue; 1727 1728 /* don't output marks to recently written files */ 1729 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1730 continue; 1731 1732 /* 1733 * suppress duplicate lines to this file 1734 */ 1735 if (no_compress - (f->f_type != F_PIPE) < 1 && 1736 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1737 strcmp(saved, f->f_prevline) == 0) { 1738 f->f_lasttime = *timestamp; 1739 f->f_prevcount++; 1740 dprintf("msg repeated %d times, %ld sec of %d\n", 1741 f->f_prevcount, (long)(now - f->f_time), 1742 repeatinterval[f->f_repeatcount]); 1743 /* 1744 * If domark would have logged this by now, 1745 * flush it now (so we don't hold isolated messages), 1746 * but back off so we'll flush less often 1747 * in the future. 1748 */ 1749 if (now > REPEATTIME(f)) { 1750 fprintlog_successive(f, flags); 1751 BACKOFF(f); 1752 } 1753 } else { 1754 /* new line, save it */ 1755 if (f->f_prevcount) 1756 fprintlog_successive(f, 0); 1757 f->f_repeatcount = 0; 1758 f->f_prevpri = pri; 1759 f->f_lasttime = *timestamp; 1760 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1761 "Space to store saved line incorrect"); 1762 (void)strcpy(f->f_prevline, saved); 1763 f->f_prevlen = savedlen; 1764 fprintlog_first(f, hostname, app_name, procid, msgid, 1765 structured_data, msg, flags); 1766 } 1767 } 1768 } 1769 1770 static void 1771 dofsync(void) 1772 { 1773 struct filed *f; 1774 1775 STAILQ_FOREACH(f, &fhead, next) { 1776 if ((f->f_type == F_FILE) && 1777 (f->f_flags & FFLAG_NEEDSYNC)) { 1778 f->f_flags &= ~FFLAG_NEEDSYNC; 1779 (void)fsync(f->f_file); 1780 } 1781 } 1782 } 1783 1784 /* 1785 * List of iovecs to which entries can be appended. 1786 * Used for constructing the message to be logged. 1787 */ 1788 struct iovlist { 1789 struct iovec iov[TTYMSG_IOV_MAX]; 1790 size_t iovcnt; 1791 size_t totalsize; 1792 }; 1793 1794 static void 1795 iovlist_init(struct iovlist *il) 1796 { 1797 1798 il->iovcnt = 0; 1799 il->totalsize = 0; 1800 } 1801 1802 static void 1803 iovlist_append(struct iovlist *il, const char *str) 1804 { 1805 size_t size; 1806 1807 /* Discard components if we've run out of iovecs. */ 1808 if (il->iovcnt < nitems(il->iov)) { 1809 size = strlen(str); 1810 il->iov[il->iovcnt++] = (struct iovec){ 1811 .iov_base = __DECONST(char *, str), 1812 .iov_len = size, 1813 }; 1814 il->totalsize += size; 1815 } 1816 } 1817 1818 #if defined(INET) || defined(INET6) 1819 static void 1820 iovlist_truncate(struct iovlist *il, size_t size) 1821 { 1822 struct iovec *last; 1823 size_t diff; 1824 1825 while (il->totalsize > size) { 1826 diff = il->totalsize - size; 1827 last = &il->iov[il->iovcnt - 1]; 1828 if (diff >= last->iov_len) { 1829 /* Remove the last iovec entirely. */ 1830 --il->iovcnt; 1831 il->totalsize -= last->iov_len; 1832 } else { 1833 /* Remove the last iovec partially. */ 1834 last->iov_len -= diff; 1835 il->totalsize -= diff; 1836 } 1837 } 1838 } 1839 #endif 1840 1841 static void 1842 fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1843 { 1844 struct msghdr msghdr; 1845 struct addrinfo *r; 1846 struct socklist *sl; 1847 const char *msgret; 1848 ssize_t lsent; 1849 1850 switch (f->f_type) { 1851 case F_FORW: 1852 dprintf(" %s", f->fu_forw_hname); 1853 switch (f->fu_forw_addr->ai_family) { 1854 #ifdef INET 1855 case AF_INET: 1856 dprintf(":%d\n", 1857 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1858 break; 1859 #endif 1860 #ifdef INET6 1861 case AF_INET6: 1862 dprintf(":%d\n", 1863 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1864 break; 1865 #endif 1866 default: 1867 dprintf("\n"); 1868 } 1869 1870 #if defined(INET) || defined(INET6) 1871 /* Truncate messages to maximum forward length. */ 1872 iovlist_truncate(il, MaxForwardLen); 1873 #endif 1874 1875 lsent = 0; 1876 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1877 memset(&msghdr, 0, sizeof(msghdr)); 1878 msghdr.msg_name = r->ai_addr; 1879 msghdr.msg_namelen = r->ai_addrlen; 1880 msghdr.msg_iov = il->iov; 1881 msghdr.msg_iovlen = il->iovcnt; 1882 STAILQ_FOREACH(sl, &shead, next) { 1883 if (sl->sl_socket < 0) 1884 continue; 1885 if (sl->sl_sa == NULL || 1886 sl->sl_family == AF_UNSPEC || 1887 sl->sl_family == AF_LOCAL) 1888 continue; 1889 lsent = sendmsg(sl->sl_socket, &msghdr, 0); 1890 if (lsent == (ssize_t)il->totalsize) 1891 break; 1892 } 1893 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1894 break; 1895 } 1896 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1897 if (lsent != (ssize_t)il->totalsize) { 1898 int e = errno; 1899 logerror("sendto"); 1900 errno = e; 1901 switch (errno) { 1902 case ENOBUFS: 1903 case ENETDOWN: 1904 case ENETUNREACH: 1905 case EHOSTUNREACH: 1906 case EHOSTDOWN: 1907 case EADDRNOTAVAIL: 1908 break; 1909 /* case EBADF: */ 1910 /* case EACCES: */ 1911 /* case ENOTSOCK: */ 1912 /* case EFAULT: */ 1913 /* case EMSGSIZE: */ 1914 /* case EAGAIN: */ 1915 /* case ENOBUFS: */ 1916 /* case ECONNREFUSED: */ 1917 default: 1918 dprintf("removing entry: errno=%d\n", e); 1919 f->f_type = F_UNUSED; 1920 break; 1921 } 1922 } 1923 break; 1924 1925 case F_FILE: 1926 dprintf(" %s\n", f->fu_fname); 1927 iovlist_append(il, "\n"); 1928 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1929 /* 1930 * If writev(2) fails for potentially transient errors 1931 * like the filesystem being full, ignore it. 1932 * Otherwise remove this logfile from the list. 1933 */ 1934 if (errno != ENOSPC) { 1935 int e = errno; 1936 close_filed(f); 1937 errno = e; 1938 logerror(f->fu_fname); 1939 } 1940 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1941 f->f_flags |= FFLAG_NEEDSYNC; 1942 needdofsync = 1; 1943 } 1944 break; 1945 1946 case F_PIPE: 1947 dprintf(" %s\n", f->fu_pipe_pname); 1948 iovlist_append(il, "\n"); 1949 if (f->fu_pipe_pid == 0) { 1950 if ((f->f_file = p_open(f->fu_pipe_pname, 1951 &f->fu_pipe_pid)) < 0) { 1952 logerror(f->fu_pipe_pname); 1953 break; 1954 } 1955 } 1956 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1957 int e = errno; 1958 1959 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1960 close_filed(f); 1961 errno = e; 1962 logerror(f->fu_pipe_pname); 1963 } 1964 break; 1965 1966 case F_CONSOLE: 1967 if (flags & IGN_CONS) { 1968 dprintf(" (ignored)\n"); 1969 break; 1970 } 1971 /* FALLTHROUGH */ 1972 1973 case F_TTY: 1974 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1975 iovlist_append(il, "\r\n"); 1976 errno = 0; /* ttymsg() only sometimes returns an errno */ 1977 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { 1978 f->f_type = F_UNUSED; 1979 logerror(msgret); 1980 } 1981 break; 1982 1983 case F_USERS: 1984 case F_WALL: 1985 dprintf("\n"); 1986 iovlist_append(il, "\r\n"); 1987 wallmsg(f, il->iov, il->iovcnt); 1988 break; 1989 } 1990 } 1991 1992 static void 1993 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1994 const char *procid, const char *msgid, const char *structured_data, 1995 const char *msg, int flags) 1996 { 1997 struct iovlist il; 1998 suseconds_t usec; 1999 int i; 2000 char timebuf[33], priority_number[5]; 2001 2002 iovlist_init(&il); 2003 if (f->f_type == F_WALL) 2004 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 2005 iovlist_append(&il, "<"); 2006 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 2007 iovlist_append(&il, priority_number); 2008 iovlist_append(&il, ">1 "); 2009 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 2010 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 2011 /* Add colon to the time zone offset, which %z doesn't do. */ 2012 timebuf[32] = '\0'; 2013 timebuf[31] = timebuf[30]; 2014 timebuf[30] = timebuf[29]; 2015 timebuf[29] = ':'; 2016 2017 /* Overwrite space for microseconds with actual value. */ 2018 usec = f->f_lasttime.usec; 2019 for (i = 25; i >= 20; --i) { 2020 timebuf[i] = usec % 10 + '0'; 2021 usec /= 10; 2022 } 2023 iovlist_append(&il, timebuf); 2024 } else 2025 iovlist_append(&il, "-"); 2026 iovlist_append(&il, " "); 2027 iovlist_append(&il, hostname); 2028 iovlist_append(&il, " "); 2029 iovlist_append(&il, app_name == NULL ? "-" : app_name); 2030 iovlist_append(&il, " "); 2031 iovlist_append(&il, procid == NULL ? "-" : procid); 2032 iovlist_append(&il, " "); 2033 iovlist_append(&il, msgid == NULL ? "-" : msgid); 2034 iovlist_append(&il, " "); 2035 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 2036 iovlist_append(&il, " "); 2037 iovlist_append(&il, msg); 2038 2039 fprintlog_write(f, &il, flags); 2040 } 2041 2042 static void 2043 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 2044 const char *procid, const char *msg, int flags) 2045 { 2046 struct iovlist il; 2047 const CODE *c; 2048 int facility, priority; 2049 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 2050 priority_number[5]; 2051 bool facility_found, priority_found; 2052 2053 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 2054 &f->f_lasttime.tm) == 0) 2055 timebuf[0] = '\0'; 2056 2057 iovlist_init(&il); 2058 switch (f->f_type) { 2059 case F_FORW: 2060 /* Message forwarded over the network. */ 2061 iovlist_append(&il, "<"); 2062 snprintf(priority_number, sizeof(priority_number), "%d", 2063 f->f_prevpri); 2064 iovlist_append(&il, priority_number); 2065 iovlist_append(&il, ">"); 2066 iovlist_append(&il, timebuf); 2067 if (strcasecmp(hostname, LocalHostName) != 0) { 2068 iovlist_append(&il, " Forwarded from "); 2069 iovlist_append(&il, hostname); 2070 iovlist_append(&il, ":"); 2071 } 2072 iovlist_append(&il, " "); 2073 break; 2074 2075 case F_WALL: 2076 /* Message written to terminals. */ 2077 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 2078 iovlist_append(&il, hostname); 2079 iovlist_append(&il, " at "); 2080 iovlist_append(&il, timebuf); 2081 iovlist_append(&il, " ...\r\n"); 2082 break; 2083 2084 default: 2085 /* Message written to files. */ 2086 iovlist_append(&il, timebuf); 2087 iovlist_append(&il, " "); 2088 2089 if (LogFacPri) { 2090 iovlist_append(&il, "<"); 2091 2092 facility = f->f_prevpri & LOG_FACMASK; 2093 facility_found = false; 2094 if (LogFacPri > 1) { 2095 for (c = facilitynames; c->c_name; c++) { 2096 if (c->c_val == facility) { 2097 iovlist_append(&il, c->c_name); 2098 facility_found = true; 2099 break; 2100 } 2101 } 2102 } 2103 if (!facility_found) { 2104 snprintf(facility_number, 2105 sizeof(facility_number), "%d", 2106 LOG_FAC(facility)); 2107 iovlist_append(&il, facility_number); 2108 } 2109 2110 iovlist_append(&il, "."); 2111 2112 priority = LOG_PRI(f->f_prevpri); 2113 priority_found = false; 2114 if (LogFacPri > 1) { 2115 for (c = prioritynames; c->c_name; c++) { 2116 if (c->c_val == priority) { 2117 iovlist_append(&il, c->c_name); 2118 priority_found = true; 2119 break; 2120 } 2121 } 2122 } 2123 if (!priority_found) { 2124 snprintf(priority_number, 2125 sizeof(priority_number), "%d", priority); 2126 iovlist_append(&il, priority_number); 2127 } 2128 2129 iovlist_append(&il, "> "); 2130 } 2131 2132 iovlist_append(&il, hostname); 2133 iovlist_append(&il, " "); 2134 break; 2135 } 2136 2137 /* Message body with application name and process ID prefixed. */ 2138 if (app_name != NULL) { 2139 iovlist_append(&il, app_name); 2140 if (procid != NULL) { 2141 iovlist_append(&il, "["); 2142 iovlist_append(&il, procid); 2143 iovlist_append(&il, "]"); 2144 } 2145 iovlist_append(&il, ": "); 2146 } 2147 iovlist_append(&il, msg); 2148 2149 fprintlog_write(f, &il, flags); 2150 } 2151 2152 static void 2153 fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2154 const char *procid, const char *msgid __unused, 2155 const char *structured_data __unused, const char *msg, int flags) 2156 { 2157 2158 dprintf("Logging to %s", TypeNames[f->f_type]); 2159 f->f_time = now; 2160 f->f_prevcount = 0; 2161 if (f->f_type == F_UNUSED) { 2162 dprintf("\n"); 2163 return; 2164 } 2165 2166 if (RFC3164OutputFormat) 2167 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2168 else 2169 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2170 structured_data, msg, flags); 2171 } 2172 2173 /* 2174 * Prints a message to a log file that the previously logged message was 2175 * received multiple times. 2176 */ 2177 static void 2178 fprintlog_successive(struct filed *f, int flags) 2179 { 2180 char msg[100]; 2181 2182 assert(f->f_prevcount > 0); 2183 snprintf(msg, sizeof(msg), "last message repeated %d times", 2184 f->f_prevcount); 2185 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2186 flags); 2187 } 2188 2189 /* 2190 * WALLMSG -- Write a message to the world at large 2191 * 2192 * Write the specified message to either the entire 2193 * world, or a list of approved users. 2194 */ 2195 static void 2196 wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 2197 { 2198 static int reenter; /* avoid calling ourselves */ 2199 struct utmpx *ut; 2200 int i; 2201 const char *p; 2202 2203 if (reenter++) 2204 return; 2205 setutxent(); 2206 /* NOSTRICT */ 2207 while ((ut = getutxent()) != NULL) { 2208 if (ut->ut_type != USER_PROCESS) 2209 continue; 2210 if (f->f_type == F_WALL) { 2211 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2212 TTYMSGTIME)) != NULL) { 2213 errno = 0; /* already in msg */ 2214 logerror(p); 2215 } 2216 continue; 2217 } 2218 /* should we send the message to this user? */ 2219 for (i = 0; i < MAXUNAMES; i++) { 2220 if (!f->fu_uname[i][0]) 2221 break; 2222 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 2223 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2224 TTYMSGTIME)) != NULL) { 2225 errno = 0; /* already in msg */ 2226 logerror(p); 2227 } 2228 break; 2229 } 2230 } 2231 } 2232 endutxent(); 2233 reenter = 0; 2234 } 2235 2236 /* 2237 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2238 */ 2239 static const char * 2240 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2241 { 2242 static char device[1024]; 2243 static char errbuf[1024]; 2244 struct stat sb; 2245 2246 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2247 2248 if (stat(device, &sb) < 0) { 2249 (void) snprintf(errbuf, sizeof(errbuf), 2250 "%s: %s", device, strerror(errno)); 2251 return (errbuf); 2252 } 2253 if ((sb.st_mode & S_IWGRP) == 0) 2254 /* Messages disabled. */ 2255 return (NULL); 2256 return ttymsg(iov, iovcnt, line, tmout); 2257 } 2258 2259 static void 2260 reapchild(int signo __unused) 2261 { 2262 int status; 2263 pid_t pid; 2264 struct filed *f; 2265 2266 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 2267 /* First, look if it's a process from the dead queue. */ 2268 if (deadq_removebypid(pid)) 2269 continue; 2270 2271 /* Now, look in list of active processes. */ 2272 STAILQ_FOREACH(f, &fhead, next) { 2273 if (f->f_type == F_PIPE && 2274 f->fu_pipe_pid == pid) { 2275 close_filed(f); 2276 log_deadchild(pid, status, f->fu_pipe_pname); 2277 break; 2278 } 2279 } 2280 } 2281 WantReapchild = 0; 2282 } 2283 2284 /* 2285 * Return a printable representation of a host address. 2286 */ 2287 static const char * 2288 cvthname(struct sockaddr *f) 2289 { 2290 int error, hl; 2291 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2292 2293 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2294 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 2295 NI_NUMERICHOST); 2296 if (error) { 2297 dprintf("Malformed from address %s\n", gai_strerror(error)); 2298 return ("???"); 2299 } 2300 dprintf("cvthname(%s)\n", ip); 2301 2302 if (!resolve) 2303 return (ip); 2304 2305 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 2306 NULL, 0, NI_NAMEREQD); 2307 if (error) { 2308 dprintf("Host name for your address (%s) unknown\n", ip); 2309 return (ip); 2310 } 2311 hl = strlen(hname); 2312 if (hl > 0 && hname[hl-1] == '.') 2313 hname[--hl] = '\0'; 2314 /* RFC 5424 prefers logging FQDNs. */ 2315 if (RFC3164OutputFormat) 2316 trimdomain(hname, hl); 2317 return (hname); 2318 } 2319 2320 static void 2321 dodie(int signo) 2322 { 2323 2324 WantDie = signo; 2325 } 2326 2327 static void 2328 domark(int signo __unused) 2329 { 2330 2331 MarkSet = 1; 2332 } 2333 2334 /* 2335 * Print syslogd errors some place. 2336 */ 2337 static void 2338 logerror(const char *msg) 2339 { 2340 char buf[512]; 2341 static int recursed = 0; 2342 2343 /* If there's an error while trying to log an error, give up. */ 2344 if (recursed) 2345 return; 2346 recursed++; 2347 if (errno != 0) { 2348 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2349 strerror(errno)); 2350 msg = buf; 2351 } 2352 errno = 0; 2353 dprintf("%s\n", buf); 2354 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2355 NULL, msg, 0); 2356 recursed--; 2357 } 2358 2359 static void 2360 die(int signo) 2361 { 2362 struct filed *f; 2363 struct socklist *sl; 2364 char buf[100]; 2365 2366 STAILQ_FOREACH(f, &fhead, next) { 2367 /* flush any pending output */ 2368 if (f->f_prevcount) 2369 fprintlog_successive(f, 0); 2370 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 2371 close_filed(f); 2372 } 2373 if (signo) { 2374 dprintf("syslogd: exiting on signal %d\n", signo); 2375 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2376 errno = 0; 2377 logerror(buf); 2378 } 2379 STAILQ_FOREACH(sl, &shead, next) { 2380 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 2381 unlink(sl->sl_peer->pe_name); 2382 } 2383 pidfile_remove(pfh); 2384 2385 exit(1); 2386 } 2387 2388 static int 2389 configfiles(const struct dirent *dp) 2390 { 2391 const char *p; 2392 size_t ext_len; 2393 2394 if (dp->d_name[0] == '.') 2395 return (0); 2396 2397 ext_len = sizeof(include_ext) -1; 2398 2399 if (dp->d_namlen <= ext_len) 2400 return (0); 2401 2402 p = &dp->d_name[dp->d_namlen - ext_len]; 2403 if (strcmp(p, include_ext) != 0) 2404 return (0); 2405 2406 return (1); 2407 } 2408 2409 static void 2410 readconfigfile(FILE *cf, int allow_includes) 2411 { 2412 FILE *cf2; 2413 struct filed *f; 2414 struct dirent **ent; 2415 char cline[LINE_MAX]; 2416 char host[MAXHOSTNAMELEN]; 2417 char prog[LINE_MAX]; 2418 char file[MAXPATHLEN]; 2419 char pfilter[LINE_MAX]; 2420 char *p, *tmp; 2421 int i, nents; 2422 size_t include_len; 2423 2424 /* 2425 * Foreach line in the conf table, open that file. 2426 */ 2427 include_len = sizeof(include_str) -1; 2428 (void)strlcpy(host, "*", sizeof(host)); 2429 (void)strlcpy(prog, "*", sizeof(prog)); 2430 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2431 while (fgets(cline, sizeof(cline), cf) != NULL) { 2432 /* 2433 * check for end-of-section, comments, strip off trailing 2434 * spaces and newline character. #!prog is treated specially: 2435 * following lines apply only to that program. 2436 */ 2437 for (p = cline; isspace(*p); ++p) 2438 continue; 2439 if (*p == 0) 2440 continue; 2441 if (allow_includes && 2442 strncmp(p, include_str, include_len) == 0 && 2443 isspace(p[include_len])) { 2444 p += include_len; 2445 while (isspace(*p)) 2446 p++; 2447 tmp = p; 2448 while (*tmp != '\0' && !isspace(*tmp)) 2449 tmp++; 2450 *tmp = '\0'; 2451 dprintf("Trying to include files in '%s'\n", p); 2452 nents = scandir(p, &ent, configfiles, alphasort); 2453 if (nents == -1) { 2454 dprintf("Unable to open '%s': %s\n", p, 2455 strerror(errno)); 2456 continue; 2457 } 2458 for (i = 0; i < nents; i++) { 2459 if (snprintf(file, sizeof(file), "%s/%s", p, 2460 ent[i]->d_name) >= (int)sizeof(file)) { 2461 dprintf("ignoring path too long: " 2462 "'%s/%s'\n", p, ent[i]->d_name); 2463 free(ent[i]); 2464 continue; 2465 } 2466 free(ent[i]); 2467 cf2 = fopen(file, "r"); 2468 if (cf2 == NULL) 2469 continue; 2470 dprintf("reading %s\n", file); 2471 readconfigfile(cf2, 0); 2472 fclose(cf2); 2473 } 2474 free(ent); 2475 continue; 2476 } 2477 if (*p == '#') { 2478 p++; 2479 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2480 continue; 2481 } 2482 if (*p == '+' || *p == '-') { 2483 host[0] = *p++; 2484 while (isspace(*p)) 2485 p++; 2486 if ((!*p) || (*p == '*')) { 2487 (void)strlcpy(host, "*", sizeof(host)); 2488 continue; 2489 } 2490 if (*p == '@') 2491 p = LocalHostName; 2492 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2493 if (!isalnum(*p) && *p != '.' && *p != '-' 2494 && *p != ',' && *p != ':' && *p != '%') 2495 break; 2496 host[i] = *p++; 2497 } 2498 host[i] = '\0'; 2499 continue; 2500 } 2501 if (*p == '!') { 2502 p++; 2503 while (isspace(*p)) p++; 2504 if ((!*p) || (*p == '*')) { 2505 (void)strlcpy(prog, "*", sizeof(prog)); 2506 continue; 2507 } 2508 for (i = 0; i < LINE_MAX - 1; i++) { 2509 if (!isprint(p[i]) || isspace(p[i])) 2510 break; 2511 prog[i] = p[i]; 2512 } 2513 prog[i] = 0; 2514 continue; 2515 } 2516 if (*p == ':') { 2517 p++; 2518 while (isspace(*p)) 2519 p++; 2520 if ((!*p) || (*p == '*')) { 2521 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2522 continue; 2523 } 2524 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2525 continue; 2526 } 2527 for (p = cline + 1; *p != '\0'; p++) { 2528 if (*p != '#') 2529 continue; 2530 if (*(p - 1) == '\\') { 2531 strcpy(p - 1, p); 2532 p--; 2533 continue; 2534 } 2535 *p = '\0'; 2536 break; 2537 } 2538 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2539 cline[i] = '\0'; 2540 f = cfline(cline, prog, host, pfilter); 2541 if (f != NULL) 2542 addfile(f); 2543 free(f); 2544 } 2545 } 2546 2547 static void 2548 sighandler(int signo) 2549 { 2550 2551 /* Send an wake-up signal to the select() loop. */ 2552 write(sigpipe[1], &signo, sizeof(signo)); 2553 } 2554 2555 /* 2556 * INIT -- Initialize syslogd from configuration table 2557 */ 2558 static void 2559 init(int signo) 2560 { 2561 int i; 2562 FILE *cf; 2563 struct filed *f; 2564 char *p; 2565 char oldLocalHostName[MAXHOSTNAMELEN]; 2566 char hostMsg[2*MAXHOSTNAMELEN+40]; 2567 char bootfileMsg[MAXLINE + 1]; 2568 2569 dprintf("init\n"); 2570 WantInitialize = 0; 2571 2572 /* 2573 * Load hostname (may have changed). 2574 */ 2575 if (signo != 0) 2576 (void)strlcpy(oldLocalHostName, LocalHostName, 2577 sizeof(oldLocalHostName)); 2578 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2579 err(EX_OSERR, "gethostname() failed"); 2580 if ((p = strchr(LocalHostName, '.')) != NULL) { 2581 /* RFC 5424 prefers logging FQDNs. */ 2582 if (RFC3164OutputFormat) 2583 *p = '\0'; 2584 LocalDomain = p + 1; 2585 } else { 2586 LocalDomain = ""; 2587 } 2588 2589 /* 2590 * Load / reload timezone data (in case it changed). 2591 * 2592 * Just calling tzset() again does not work, the timezone code 2593 * caches the result. However, by setting the TZ variable, one 2594 * can defeat the caching and have the timezone code really 2595 * reload the timezone data. Respect any initial setting of 2596 * TZ, in case the system is configured specially. 2597 */ 2598 dprintf("loading timezone data via tzset()\n"); 2599 if (getenv("TZ")) { 2600 tzset(); 2601 } else { 2602 setenv("TZ", ":/etc/localtime", 1); 2603 tzset(); 2604 unsetenv("TZ"); 2605 } 2606 2607 /* 2608 * Close all open log files. 2609 */ 2610 Initialized = 0; 2611 STAILQ_FOREACH(f, &fhead, next) { 2612 /* flush any pending output */ 2613 if (f->f_prevcount) 2614 fprintlog_successive(f, 0); 2615 2616 switch (f->f_type) { 2617 case F_FILE: 2618 case F_FORW: 2619 case F_CONSOLE: 2620 case F_TTY: 2621 close_filed(f); 2622 break; 2623 case F_PIPE: 2624 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 2625 close_filed(f); 2626 break; 2627 } 2628 } 2629 while(!STAILQ_EMPTY(&fhead)) { 2630 f = STAILQ_FIRST(&fhead); 2631 STAILQ_REMOVE_HEAD(&fhead, next); 2632 free(f->f_program); 2633 free(f->f_host); 2634 if (f->f_prop_filter) { 2635 switch (f->f_prop_filter->cmp_type) { 2636 case PROP_CMP_REGEX: 2637 regfree(f->f_prop_filter->pflt_re); 2638 free(f->f_prop_filter->pflt_re); 2639 break; 2640 case PROP_CMP_CONTAINS: 2641 case PROP_CMP_EQUAL: 2642 case PROP_CMP_STARTS: 2643 free(f->f_prop_filter->pflt_strval); 2644 break; 2645 } 2646 free(f->f_prop_filter); 2647 } 2648 free(f); 2649 } 2650 2651 /* open the configuration file */ 2652 if ((cf = fopen(ConfFile, "r")) == NULL) { 2653 dprintf("cannot open %s\n", ConfFile); 2654 f = cfline("*.ERR\t/dev/console", "*", "*", "*"); 2655 if (f != NULL) 2656 addfile(f); 2657 free(f); 2658 f = cfline("*.PANIC\t*", "*", "*", "*"); 2659 if (f != NULL) 2660 addfile(f); 2661 free(f); 2662 Initialized = 1; 2663 2664 return; 2665 } 2666 2667 readconfigfile(cf, 1); 2668 2669 /* close the configuration file */ 2670 (void)fclose(cf); 2671 2672 Initialized = 1; 2673 2674 if (Debug) { 2675 int port; 2676 STAILQ_FOREACH(f, &fhead, next) { 2677 for (i = 0; i <= LOG_NFACILITIES; i++) 2678 if (f->f_pmask[i] == INTERNAL_NOPRI) 2679 printf("X "); 2680 else 2681 printf("%d ", f->f_pmask[i]); 2682 printf("%s: ", TypeNames[f->f_type]); 2683 switch (f->f_type) { 2684 case F_FILE: 2685 printf("%s", f->fu_fname); 2686 break; 2687 2688 case F_CONSOLE: 2689 case F_TTY: 2690 printf("%s%s", _PATH_DEV, f->fu_fname); 2691 break; 2692 2693 case F_FORW: 2694 switch (f->fu_forw_addr->ai_family) { 2695 #ifdef INET 2696 case AF_INET: 2697 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2698 break; 2699 #endif 2700 #ifdef INET6 2701 case AF_INET6: 2702 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2703 break; 2704 #endif 2705 default: 2706 port = 0; 2707 } 2708 if (port != 514) { 2709 printf("%s:%d", 2710 f->fu_forw_hname, port); 2711 } else { 2712 printf("%s", f->fu_forw_hname); 2713 } 2714 break; 2715 2716 case F_PIPE: 2717 printf("%s", f->fu_pipe_pname); 2718 break; 2719 2720 case F_USERS: 2721 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2722 printf("%s, ", f->fu_uname[i]); 2723 break; 2724 } 2725 if (f->f_program) 2726 printf(" (%s)", f->f_program); 2727 printf("\n"); 2728 } 2729 } 2730 2731 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2732 NULL, NULL, "restart", 0); 2733 dprintf("syslogd: restarted\n"); 2734 /* 2735 * Log a change in hostname, but only on a restart. 2736 */ 2737 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2738 (void)snprintf(hostMsg, sizeof(hostMsg), 2739 "hostname changed, \"%s\" to \"%s\"", 2740 oldLocalHostName, LocalHostName); 2741 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2742 NULL, NULL, NULL, hostMsg, 0); 2743 dprintf("%s\n", hostMsg); 2744 } 2745 /* 2746 * Log the kernel boot file if we aren't going to use it as 2747 * the prefix, and if this is *not* a restart. 2748 */ 2749 if (signo == 0 && !use_bootfile) { 2750 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2751 "kernel boot file is %s", bootfile); 2752 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2753 NULL, NULL, NULL, bootfileMsg, 0); 2754 dprintf("%s\n", bootfileMsg); 2755 } 2756 } 2757 2758 /* 2759 * Compile property-based filter. 2760 * Returns 0 on success, -1 otherwise. 2761 */ 2762 static int 2763 prop_filter_compile(struct prop_filter *pfilter, char *filter) 2764 { 2765 char *filter_endpos, *p; 2766 char **ap, *argv[2] = {NULL, NULL}; 2767 int re_flags = REG_NOSUB; 2768 int escaped; 2769 2770 bzero(pfilter, sizeof(struct prop_filter)); 2771 2772 /* 2773 * Here's some filter examples mentioned in syslog.conf(5) 2774 * 'msg, contains, ".*Deny.*"' 2775 * 'programname, regex, "^bird6?$"' 2776 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2777 */ 2778 2779 /* 2780 * Split filter into 3 parts: property name (argv[0]), 2781 * cmp type (argv[1]) and lvalue for comparison (filter). 2782 */ 2783 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2784 if (**ap != '\0') 2785 if (++ap >= &argv[2]) 2786 break; 2787 } 2788 2789 if (argv[0] == NULL || argv[1] == NULL) { 2790 logerror("filter parse error"); 2791 return (-1); 2792 } 2793 2794 /* fill in prop_type */ 2795 if (strcasecmp(argv[0], "msg") == 0) 2796 pfilter->prop_type = PROP_TYPE_MSG; 2797 else if(strcasecmp(argv[0], "hostname") == 0) 2798 pfilter->prop_type = PROP_TYPE_HOSTNAME; 2799 else if(strcasecmp(argv[0], "source") == 0) 2800 pfilter->prop_type = PROP_TYPE_HOSTNAME; 2801 else if(strcasecmp(argv[0], "programname") == 0) 2802 pfilter->prop_type = PROP_TYPE_PROGNAME; 2803 else { 2804 logerror("unknown property"); 2805 return (-1); 2806 } 2807 2808 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2809 if (*argv[1] == '!') { 2810 pfilter->cmp_flags |= PROP_FLAG_EXCLUDE; 2811 argv[1]++; 2812 } 2813 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2814 pfilter->cmp_flags |= PROP_FLAG_ICASE; 2815 argv[1] += sizeof("icase_") - 1; 2816 } 2817 2818 /* fill in cmp_type */ 2819 if (strcasecmp(argv[1], "contains") == 0) 2820 pfilter->cmp_type = PROP_CMP_CONTAINS; 2821 else if (strcasecmp(argv[1], "isequal") == 0) 2822 pfilter->cmp_type = PROP_CMP_EQUAL; 2823 else if (strcasecmp(argv[1], "startswith") == 0) 2824 pfilter->cmp_type = PROP_CMP_STARTS; 2825 else if (strcasecmp(argv[1], "regex") == 0) 2826 pfilter->cmp_type = PROP_CMP_REGEX; 2827 else if (strcasecmp(argv[1], "ereregex") == 0) { 2828 pfilter->cmp_type = PROP_CMP_REGEX; 2829 re_flags |= REG_EXTENDED; 2830 } else { 2831 logerror("unknown cmp function"); 2832 return (-1); 2833 } 2834 2835 /* 2836 * Handle filter value 2837 */ 2838 2839 /* ' ".*Deny.*"' */ 2840 /* remove leading whitespace and check for '"' next character */ 2841 filter += strspn(filter, ", \t\n"); 2842 if (*filter != '"' || strlen(filter) < 3) { 2843 logerror("property value parse error"); 2844 return (-1); 2845 } 2846 filter++; 2847 2848 /* '.*Deny.*"' */ 2849 /* process possible backslash (\") escaping */ 2850 escaped = 0; 2851 filter_endpos = filter; 2852 for (p = filter; *p != '\0'; p++) { 2853 if (*p == '\\' && !escaped) { 2854 escaped = 1; 2855 /* do not shift filter_endpos */ 2856 continue; 2857 } 2858 if (*p == '"' && !escaped) { 2859 p++; 2860 break; 2861 } 2862 /* we've seen some esc symbols, need to compress the line */ 2863 if (filter_endpos != p) 2864 *filter_endpos = *p; 2865 2866 filter_endpos++; 2867 escaped = 0; 2868 } 2869 2870 *filter_endpos = '\0'; 2871 /* '.*Deny.*' */ 2872 2873 /* We should not have anything but whitespace left after closing '"' */ 2874 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2875 logerror("property value parse error"); 2876 return (-1); 2877 } 2878 2879 if (pfilter->cmp_type == PROP_CMP_REGEX) { 2880 pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re)); 2881 if (pfilter->pflt_re == NULL) { 2882 logerror("RE calloc() error"); 2883 free(pfilter->pflt_re); 2884 return (-1); 2885 } 2886 if (pfilter->cmp_flags & PROP_FLAG_ICASE) 2887 re_flags |= REG_ICASE; 2888 if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) { 2889 logerror("RE compilation error"); 2890 free(pfilter->pflt_re); 2891 return (-1); 2892 } 2893 } else { 2894 pfilter->pflt_strval = strdup(filter); 2895 pfilter->pflt_strlen = strlen(filter); 2896 } 2897 2898 return (0); 2899 2900 } 2901 2902 /* 2903 * Crack a configuration file line 2904 */ 2905 static struct filed * 2906 cfline(const char *line, const char *prog, const char *host, 2907 const char *pfilter) 2908 { 2909 struct filed *f; 2910 struct addrinfo hints, *res; 2911 int error, i, pri, syncfile; 2912 const char *p, *q; 2913 char *bp, *pfilter_dup; 2914 char buf[LINE_MAX], ebuf[100]; 2915 2916 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 2917 host, pfilter); 2918 2919 f = calloc(1, sizeof(*f)); 2920 if (f == NULL) { 2921 logerror("malloc"); 2922 exit(1); 2923 } 2924 errno = 0; /* keep strerror() stuff out of logerror messages */ 2925 2926 for (i = 0; i <= LOG_NFACILITIES; i++) 2927 f->f_pmask[i] = INTERNAL_NOPRI; 2928 2929 /* save hostname if any */ 2930 if (host && *host == '*') 2931 host = NULL; 2932 if (host) { 2933 int hl; 2934 2935 f->f_host = strdup(host); 2936 if (f->f_host == NULL) { 2937 logerror("strdup"); 2938 exit(1); 2939 } 2940 hl = strlen(f->f_host); 2941 if (hl > 0 && f->f_host[hl-1] == '.') 2942 f->f_host[--hl] = '\0'; 2943 /* RFC 5424 prefers logging FQDNs. */ 2944 if (RFC3164OutputFormat) 2945 trimdomain(f->f_host, hl); 2946 } 2947 2948 /* save program name if any */ 2949 if (prog && *prog == '*') 2950 prog = NULL; 2951 if (prog) { 2952 f->f_program = strdup(prog); 2953 if (f->f_program == NULL) { 2954 logerror("strdup"); 2955 exit(1); 2956 } 2957 } 2958 2959 if (pfilter) { 2960 f->f_prop_filter = calloc(1, sizeof(*(f->f_prop_filter))); 2961 if (f->f_prop_filter == NULL) { 2962 logerror("pfilter calloc"); 2963 exit(1); 2964 } 2965 if (*pfilter == '*') 2966 f->f_prop_filter->prop_type = PROP_TYPE_NOOP; 2967 else { 2968 pfilter_dup = strdup(pfilter); 2969 if (pfilter_dup == NULL) { 2970 logerror("strdup"); 2971 exit(1); 2972 } 2973 if (prop_filter_compile(f->f_prop_filter, pfilter_dup)) { 2974 logerror("filter compile error"); 2975 exit(1); 2976 } 2977 } 2978 } 2979 2980 /* scan through the list of selectors */ 2981 for (p = line; *p && *p != '\t' && *p != ' ';) { 2982 int pri_done; 2983 int pri_cmp; 2984 int pri_invert; 2985 2986 /* find the end of this facility name list */ 2987 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2988 continue; 2989 2990 /* get the priority comparison */ 2991 pri_cmp = 0; 2992 pri_done = 0; 2993 pri_invert = 0; 2994 if (*q == '!') { 2995 pri_invert = 1; 2996 q++; 2997 } 2998 while (!pri_done) { 2999 switch (*q) { 3000 case '<': 3001 pri_cmp |= PRI_LT; 3002 q++; 3003 break; 3004 case '=': 3005 pri_cmp |= PRI_EQ; 3006 q++; 3007 break; 3008 case '>': 3009 pri_cmp |= PRI_GT; 3010 q++; 3011 break; 3012 default: 3013 pri_done++; 3014 break; 3015 } 3016 } 3017 3018 /* collect priority name */ 3019 for (bp = buf; *q && !strchr("\t,; ", *q); ) 3020 *bp++ = *q++; 3021 *bp = '\0'; 3022 3023 /* skip cruft */ 3024 while (strchr(",;", *q)) 3025 q++; 3026 3027 /* decode priority name */ 3028 if (*buf == '*') { 3029 pri = LOG_PRIMASK; 3030 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 3031 } else { 3032 /* Ignore trailing spaces. */ 3033 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 3034 buf[i] = '\0'; 3035 3036 pri = decode(buf, prioritynames); 3037 if (pri < 0) { 3038 errno = 0; 3039 (void)snprintf(ebuf, sizeof ebuf, 3040 "unknown priority name \"%s\"", buf); 3041 logerror(ebuf); 3042 free(f); 3043 return (NULL); 3044 } 3045 } 3046 if (!pri_cmp) 3047 pri_cmp = (UniquePriority) 3048 ? (PRI_EQ) 3049 : (PRI_EQ | PRI_GT) 3050 ; 3051 if (pri_invert) 3052 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 3053 3054 /* scan facilities */ 3055 while (*p && !strchr("\t.; ", *p)) { 3056 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 3057 *bp++ = *p++; 3058 *bp = '\0'; 3059 3060 if (*buf == '*') { 3061 for (i = 0; i < LOG_NFACILITIES; i++) { 3062 f->f_pmask[i] = pri; 3063 f->f_pcmp[i] = pri_cmp; 3064 } 3065 } else { 3066 i = decode(buf, facilitynames); 3067 if (i < 0) { 3068 errno = 0; 3069 (void)snprintf(ebuf, sizeof ebuf, 3070 "unknown facility name \"%s\"", 3071 buf); 3072 logerror(ebuf); 3073 free(f); 3074 return (NULL); 3075 } 3076 f->f_pmask[i >> 3] = pri; 3077 f->f_pcmp[i >> 3] = pri_cmp; 3078 } 3079 while (*p == ',' || *p == ' ') 3080 p++; 3081 } 3082 3083 p = q; 3084 } 3085 3086 /* skip to action part */ 3087 while (*p == '\t' || *p == ' ') 3088 p++; 3089 3090 if (*p == '-') { 3091 syncfile = 0; 3092 p++; 3093 } else 3094 syncfile = 1; 3095 3096 switch (*p) { 3097 case '@': 3098 { 3099 char *tp; 3100 char endkey = ':'; 3101 /* 3102 * scan forward to see if there is a port defined. 3103 * so we can't use strlcpy.. 3104 */ 3105 i = sizeof(f->fu_forw_hname); 3106 tp = f->fu_forw_hname; 3107 p++; 3108 3109 /* 3110 * an ipv6 address should start with a '[' in that case 3111 * we should scan for a ']' 3112 */ 3113 if (*p == '[') { 3114 p++; 3115 endkey = ']'; 3116 } 3117 while (*p && (*p != endkey) && (i-- > 0)) { 3118 *tp++ = *p++; 3119 } 3120 if (endkey == ']' && *p == endkey) 3121 p++; 3122 *tp = '\0'; 3123 } 3124 /* See if we copied a domain and have a port */ 3125 if (*p == ':') 3126 p++; 3127 else 3128 p = NULL; 3129 3130 hints = (struct addrinfo){ 3131 .ai_family = family, 3132 .ai_socktype = SOCK_DGRAM 3133 }; 3134 error = getaddrinfo(f->fu_forw_hname, 3135 p ? p : "syslog", &hints, &res); 3136 if (error) { 3137 logerror(gai_strerror(error)); 3138 break; 3139 } 3140 f->fu_forw_addr = res; 3141 f->f_type = F_FORW; 3142 break; 3143 3144 case '/': 3145 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3146 f->f_type = F_UNUSED; 3147 logerror(p); 3148 break; 3149 } 3150 if (syncfile) 3151 f->f_flags |= FFLAG_SYNC; 3152 if (isatty(f->f_file)) { 3153 if (strcmp(p, ctty) == 0) 3154 f->f_type = F_CONSOLE; 3155 else 3156 f->f_type = F_TTY; 3157 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 3158 sizeof(f->fu_fname)); 3159 } else { 3160 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 3161 f->f_type = F_FILE; 3162 } 3163 break; 3164 3165 case '|': 3166 f->fu_pipe_pid = 0; 3167 (void)strlcpy(f->fu_pipe_pname, p + 1, 3168 sizeof(f->fu_pipe_pname)); 3169 f->f_type = F_PIPE; 3170 break; 3171 3172 case '*': 3173 f->f_type = F_WALL; 3174 break; 3175 3176 default: 3177 for (i = 0; i < MAXUNAMES && *p; i++) { 3178 for (q = p; *q && *q != ','; ) 3179 q++; 3180 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 3181 if ((q - p) >= MAXLOGNAME) 3182 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 3183 else 3184 f->fu_uname[i][q - p] = '\0'; 3185 while (*q == ',' || *q == ' ') 3186 q++; 3187 p = q; 3188 } 3189 f->f_type = F_USERS; 3190 break; 3191 } 3192 return (f); 3193 } 3194 3195 3196 /* 3197 * Decode a symbolic name to a numeric value 3198 */ 3199 static int 3200 decode(const char *name, const CODE *codetab) 3201 { 3202 const CODE *c; 3203 char *p, buf[40]; 3204 3205 if (isdigit(*name)) 3206 return (atoi(name)); 3207 3208 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3209 if (isupper(*name)) 3210 *p = tolower(*name); 3211 else 3212 *p = *name; 3213 } 3214 *p = '\0'; 3215 for (c = codetab; c->c_name; c++) 3216 if (!strcmp(buf, c->c_name)) 3217 return (c->c_val); 3218 3219 return (-1); 3220 } 3221 3222 static void 3223 markit(void) 3224 { 3225 struct filed *f; 3226 struct deadq_entry *dq, *dq0; 3227 3228 now = time((time_t *)NULL); 3229 MarkSeq += TIMERINTVL; 3230 if (MarkSeq >= MarkInterval) { 3231 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3232 "-- MARK --", MARK); 3233 MarkSeq = 0; 3234 } 3235 3236 STAILQ_FOREACH(f, &fhead, next) { 3237 if (f->f_prevcount && now >= REPEATTIME(f)) { 3238 dprintf("flush %s: repeated %d times, %d sec.\n", 3239 TypeNames[f->f_type], f->f_prevcount, 3240 repeatinterval[f->f_repeatcount]); 3241 fprintlog_successive(f, 0); 3242 BACKOFF(f); 3243 } 3244 } 3245 3246 /* Walk the dead queue, and see if we should signal somebody. */ 3247 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3248 switch (dq->dq_timeout) { 3249 case 0: 3250 /* Already signalled once, try harder now. */ 3251 if (kill(dq->dq_pid, SIGKILL) != 0) 3252 (void)deadq_remove(dq); 3253 break; 3254 3255 case 1: 3256 /* 3257 * Timed out on dead queue, send terminate 3258 * signal. Note that we leave the removal 3259 * from the dead queue to reapchild(), which 3260 * will also log the event (unless the process 3261 * didn't even really exist, in case we simply 3262 * drop it from the dead queue). 3263 */ 3264 if (kill(dq->dq_pid, SIGTERM) != 0) 3265 (void)deadq_remove(dq); 3266 else 3267 dq->dq_timeout--; 3268 break; 3269 default: 3270 dq->dq_timeout--; 3271 } 3272 } 3273 MarkSet = 0; 3274 (void)alarm(TIMERINTVL); 3275 } 3276 3277 /* 3278 * fork off and become a daemon, but wait for the child to come online 3279 * before returning to the parent, or we get disk thrashing at boot etc. 3280 * Set a timer so we don't hang forever if it wedges. 3281 */ 3282 static int 3283 waitdaemon(int maxwait) 3284 { 3285 int fd; 3286 int status; 3287 pid_t pid, childpid; 3288 3289 switch (childpid = fork()) { 3290 case -1: 3291 return (-1); 3292 case 0: 3293 break; 3294 default: 3295 signal(SIGALRM, timedout); 3296 alarm(maxwait); 3297 while ((pid = wait3(&status, 0, NULL)) != -1) { 3298 if (WIFEXITED(status)) 3299 errx(1, "child pid %d exited with return code %d", 3300 pid, WEXITSTATUS(status)); 3301 if (WIFSIGNALED(status)) 3302 errx(1, "child pid %d exited on signal %d%s", 3303 pid, WTERMSIG(status), 3304 WCOREDUMP(status) ? " (core dumped)" : 3305 ""); 3306 if (pid == childpid) /* it's gone... */ 3307 break; 3308 } 3309 exit(0); 3310 } 3311 3312 if (setsid() == -1) 3313 return (-1); 3314 3315 (void)chdir("/"); 3316 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 3317 (void)dup2(fd, STDIN_FILENO); 3318 (void)dup2(fd, STDOUT_FILENO); 3319 (void)dup2(fd, STDERR_FILENO); 3320 if (fd > STDERR_FILENO) 3321 (void)close(fd); 3322 } 3323 return (getppid()); 3324 } 3325 3326 /* 3327 * We get a SIGALRM from the child when it's running and finished doing it's 3328 * fsync()'s or O_SYNC writes for all the boot messages. 3329 * 3330 * We also get a signal from the kernel if the timer expires, so check to 3331 * see what happened. 3332 */ 3333 static void 3334 timedout(int sig __unused) 3335 { 3336 int left; 3337 left = alarm(0); 3338 signal(SIGALRM, SIG_DFL); 3339 if (left == 0) 3340 errx(1, "timed out waiting for child"); 3341 else 3342 _exit(0); 3343 } 3344 3345 /* 3346 * Add `s' to the list of allowable peer addresses to accept messages 3347 * from. 3348 * 3349 * `s' is a string in the form: 3350 * 3351 * [*]domainname[:{servicename|portnumber|*}] 3352 * 3353 * or 3354 * 3355 * netaddr/maskbits[:{servicename|portnumber|*}] 3356 * 3357 * Returns -1 on error, 0 if the argument was valid. 3358 */ 3359 static int 3360 #if defined(INET) || defined(INET6) 3361 allowaddr(char *s) 3362 #else 3363 allowaddr(char *s __unused) 3364 #endif 3365 { 3366 #if defined(INET) || defined(INET6) 3367 char *cp1, *cp2; 3368 struct allowedpeer *ap; 3369 struct servent *se; 3370 int masklen = -1; 3371 struct addrinfo hints, *res = NULL; 3372 #ifdef INET 3373 in_addr_t *addrp, *maskp; 3374 #endif 3375 #ifdef INET6 3376 uint32_t *addr6p, *mask6p; 3377 #endif 3378 char ip[NI_MAXHOST]; 3379 3380 ap = calloc(1, sizeof(*ap)); 3381 if (ap == NULL) 3382 err(1, "malloc failed"); 3383 3384 #ifdef INET6 3385 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3386 #endif 3387 cp1 = s; 3388 if ((cp1 = strrchr(cp1, ':'))) { 3389 /* service/port provided */ 3390 *cp1++ = '\0'; 3391 if (strlen(cp1) == 1 && *cp1 == '*') 3392 /* any port allowed */ 3393 ap->port = 0; 3394 else if ((se = getservbyname(cp1, "udp"))) { 3395 ap->port = ntohs(se->s_port); 3396 } else { 3397 ap->port = strtol(cp1, &cp2, 0); 3398 /* port not numeric */ 3399 if (*cp2 != '\0') 3400 goto err; 3401 } 3402 } else { 3403 if ((se = getservbyname("syslog", "udp"))) 3404 ap->port = ntohs(se->s_port); 3405 else 3406 /* sanity, should not happen */ 3407 ap->port = 514; 3408 } 3409 3410 if ((cp1 = strchr(s, '/')) != NULL && 3411 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3412 *cp1 = '\0'; 3413 if ((masklen = atoi(cp1 + 1)) < 0) 3414 goto err; 3415 } 3416 #ifdef INET6 3417 if (*s == '[') { 3418 cp2 = s + strlen(s) - 1; 3419 if (*cp2 == ']') { 3420 ++s; 3421 *cp2 = '\0'; 3422 } else { 3423 cp2 = NULL; 3424 } 3425 } else { 3426 cp2 = NULL; 3427 } 3428 #endif 3429 hints = (struct addrinfo){ 3430 .ai_family = PF_UNSPEC, 3431 .ai_socktype = SOCK_DGRAM, 3432 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3433 }; 3434 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3435 ap->isnumeric = 1; 3436 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3437 ap->a_mask = (struct sockaddr_storage){ 3438 .ss_family = res->ai_family, 3439 .ss_len = res->ai_addrlen 3440 }; 3441 switch (res->ai_family) { 3442 #ifdef INET 3443 case AF_INET: 3444 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3445 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3446 if (masklen < 0) { 3447 /* use default netmask */ 3448 if (IN_CLASSA(ntohl(*addrp))) 3449 *maskp = htonl(IN_CLASSA_NET); 3450 else if (IN_CLASSB(ntohl(*addrp))) 3451 *maskp = htonl(IN_CLASSB_NET); 3452 else 3453 *maskp = htonl(IN_CLASSC_NET); 3454 } else if (masklen == 0) { 3455 *maskp = 0; 3456 } else if (masklen <= 32) { 3457 /* convert masklen to netmask */ 3458 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3459 } else { 3460 goto err; 3461 } 3462 /* Lose any host bits in the network number. */ 3463 *addrp &= *maskp; 3464 break; 3465 #endif 3466 #ifdef INET6 3467 case AF_INET6: 3468 if (masklen > 128) 3469 goto err; 3470 3471 if (masklen < 0) 3472 masklen = 128; 3473 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3474 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3475 /* convert masklen to netmask */ 3476 while (masklen > 0) { 3477 if (masklen < 32) { 3478 *mask6p = 3479 htonl(~(0xffffffff >> masklen)); 3480 *addr6p &= *mask6p; 3481 break; 3482 } else { 3483 *mask6p++ = 0xffffffff; 3484 addr6p++; 3485 masklen -= 32; 3486 } 3487 } 3488 break; 3489 #endif 3490 default: 3491 goto err; 3492 } 3493 freeaddrinfo(res); 3494 } else { 3495 /* arg `s' is domain name */ 3496 ap->isnumeric = 0; 3497 ap->a_name = s; 3498 if (cp1) 3499 *cp1 = '/'; 3500 #ifdef INET6 3501 if (cp2) { 3502 *cp2 = ']'; 3503 --s; 3504 } 3505 #endif 3506 } 3507 STAILQ_INSERT_TAIL(&aphead, ap, next); 3508 3509 if (Debug) { 3510 printf("allowaddr: rule "); 3511 if (ap->isnumeric) { 3512 printf("numeric, "); 3513 getnameinfo(sstosa(&ap->a_addr), 3514 (sstosa(&ap->a_addr))->sa_len, 3515 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3516 printf("addr = %s, ", ip); 3517 getnameinfo(sstosa(&ap->a_mask), 3518 (sstosa(&ap->a_mask))->sa_len, 3519 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3520 printf("mask = %s; ", ip); 3521 } else { 3522 printf("domainname = %s; ", ap->a_name); 3523 } 3524 printf("port = %d\n", ap->port); 3525 } 3526 3527 return (0); 3528 err: 3529 if (res != NULL) 3530 freeaddrinfo(res); 3531 free(ap); 3532 #endif 3533 return (-1); 3534 } 3535 3536 /* 3537 * Validate that the remote peer has permission to log to us. 3538 */ 3539 static int 3540 validate(struct sockaddr *sa, const char *hname) 3541 { 3542 int i; 3543 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3544 struct allowedpeer *ap; 3545 #ifdef INET 3546 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3547 #endif 3548 #ifdef INET6 3549 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3550 #endif 3551 struct addrinfo hints, *res; 3552 u_short sport; 3553 int num = 0; 3554 3555 STAILQ_FOREACH(ap, &aphead, next) { 3556 num++; 3557 } 3558 dprintf("# of validation rule: %d\n", num); 3559 if (num == 0) 3560 /* traditional behaviour, allow everything */ 3561 return (1); 3562 3563 (void)strlcpy(name, hname, sizeof(name)); 3564 hints = (struct addrinfo){ 3565 .ai_family = PF_UNSPEC, 3566 .ai_socktype = SOCK_DGRAM, 3567 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3568 }; 3569 if (getaddrinfo(name, NULL, &hints, &res) == 0) 3570 freeaddrinfo(res); 3571 else if (strchr(name, '.') == NULL) { 3572 strlcat(name, ".", sizeof name); 3573 strlcat(name, LocalDomain, sizeof name); 3574 } 3575 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 3576 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3577 return (0); /* for safety, should not occur */ 3578 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3579 ip, port, name); 3580 sport = atoi(port); 3581 3582 /* now, walk down the list */ 3583 i = 0; 3584 STAILQ_FOREACH(ap, &aphead, next) { 3585 i++; 3586 if (ap->port != 0 && ap->port != sport) { 3587 dprintf("rejected in rule %d due to port mismatch.\n", 3588 i); 3589 continue; 3590 } 3591 3592 if (ap->isnumeric) { 3593 if (ap->a_addr.ss_family != sa->sa_family) { 3594 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3595 continue; 3596 } 3597 #ifdef INET 3598 else if (ap->a_addr.ss_family == AF_INET) { 3599 sin4 = satosin(sa); 3600 a4p = satosin(&ap->a_addr); 3601 m4p = satosin(&ap->a_mask); 3602 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3603 != a4p->sin_addr.s_addr) { 3604 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3605 continue; 3606 } 3607 } 3608 #endif 3609 #ifdef INET6 3610 else if (ap->a_addr.ss_family == AF_INET6) { 3611 sin6 = satosin6(sa); 3612 a6p = satosin6(&ap->a_addr); 3613 m6p = satosin6(&ap->a_mask); 3614 if (a6p->sin6_scope_id != 0 && 3615 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3616 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3617 continue; 3618 } 3619 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3620 &a6p->sin6_addr, &m6p->sin6_addr)) { 3621 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3622 continue; 3623 } 3624 } 3625 #endif 3626 else 3627 continue; 3628 } else { 3629 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3630 FNM_NOMATCH) { 3631 dprintf("rejected in rule %d due to name " 3632 "mismatch.\n", i); 3633 continue; 3634 } 3635 } 3636 dprintf("accepted in rule %d.\n", i); 3637 return (1); /* hooray! */ 3638 } 3639 return (0); 3640 } 3641 3642 /* 3643 * Fairly similar to popen(3), but returns an open descriptor, as 3644 * opposed to a FILE *. 3645 */ 3646 static int 3647 p_open(const char *prog, pid_t *rpid) 3648 { 3649 int pfd[2], nulldesc; 3650 pid_t pid; 3651 char *argv[4]; /* sh -c cmd NULL */ 3652 char errmsg[200]; 3653 3654 if (pipe(pfd) == -1) 3655 return (-1); 3656 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 3657 /* we are royally screwed anyway */ 3658 return (-1); 3659 3660 switch ((pid = fork())) { 3661 case -1: 3662 close(nulldesc); 3663 return (-1); 3664 3665 case 0: 3666 (void)setsid(); /* Avoid catching SIGHUPs. */ 3667 argv[0] = strdup("sh"); 3668 argv[1] = strdup("-c"); 3669 argv[2] = strdup(prog); 3670 argv[3] = NULL; 3671 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 3672 logerror("strdup"); 3673 exit(1); 3674 } 3675 3676 alarm(0); 3677 3678 /* Restore signals marked as SIG_IGN. */ 3679 (void)signal(SIGINT, SIG_DFL); 3680 (void)signal(SIGQUIT, SIG_DFL); 3681 (void)signal(SIGPIPE, SIG_DFL); 3682 3683 dup2(pfd[0], STDIN_FILENO); 3684 dup2(nulldesc, STDOUT_FILENO); 3685 dup2(nulldesc, STDERR_FILENO); 3686 closefrom(STDERR_FILENO + 1); 3687 3688 (void)execvp(_PATH_BSHELL, argv); 3689 _exit(255); 3690 } 3691 close(nulldesc); 3692 close(pfd[0]); 3693 /* 3694 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3695 * supposed to get an EWOULDBLOCK on writev(2), which is 3696 * caught by the logic above anyway, which will in turn close 3697 * the pipe, and fork a new logging subprocess if necessary. 3698 * The stale subprocess will be killed some time later unless 3699 * it terminated itself due to closing its input pipe (so we 3700 * get rid of really dead puppies). 3701 */ 3702 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3703 /* This is bad. */ 3704 (void)snprintf(errmsg, sizeof errmsg, 3705 "Warning: cannot change pipe to PID %d to " 3706 "non-blocking behaviour.", 3707 (int)pid); 3708 logerror(errmsg); 3709 } 3710 *rpid = pid; 3711 return (pfd[1]); 3712 } 3713 3714 static void 3715 deadq_enter(pid_t pid, const char *name) 3716 { 3717 struct deadq_entry *dq; 3718 int status; 3719 3720 if (pid == 0) 3721 return; 3722 /* 3723 * Be paranoid, if we can't signal the process, don't enter it 3724 * into the dead queue (perhaps it's already dead). If possible, 3725 * we try to fetch and log the child's status. 3726 */ 3727 if (kill(pid, 0) != 0) { 3728 if (waitpid(pid, &status, WNOHANG) > 0) 3729 log_deadchild(pid, status, name); 3730 return; 3731 } 3732 3733 dq = malloc(sizeof(*dq)); 3734 if (dq == NULL) { 3735 logerror("malloc"); 3736 exit(1); 3737 } 3738 *dq = (struct deadq_entry){ 3739 .dq_pid = pid, 3740 .dq_timeout = DQ_TIMO_INIT 3741 }; 3742 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3743 } 3744 3745 static int 3746 deadq_remove(struct deadq_entry *dq) 3747 { 3748 if (dq != NULL) { 3749 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3750 free(dq); 3751 return (1); 3752 } 3753 3754 return (0); 3755 } 3756 3757 static int 3758 deadq_removebypid(pid_t pid) 3759 { 3760 struct deadq_entry *dq; 3761 3762 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 3763 if (dq->dq_pid == pid) 3764 break; 3765 } 3766 return (deadq_remove(dq)); 3767 } 3768 3769 static void 3770 log_deadchild(pid_t pid, int status, const char *name) 3771 { 3772 int code; 3773 char buf[256]; 3774 const char *reason; 3775 3776 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 3777 if (WIFSIGNALED(status)) { 3778 reason = "due to signal"; 3779 code = WTERMSIG(status); 3780 } else { 3781 reason = "with status"; 3782 code = WEXITSTATUS(status); 3783 if (code == 0) 3784 return; 3785 } 3786 (void)snprintf(buf, sizeof buf, 3787 "Logging subprocess %d (%s) exited %s %d.", 3788 pid, name, reason, code); 3789 logerror(buf); 3790 } 3791 3792 static int 3793 socksetup(struct peer *pe) 3794 { 3795 struct addrinfo hints, *res, *res0; 3796 int error; 3797 char *cp; 3798 int (*sl_recv)(struct socklist *); 3799 /* 3800 * We have to handle this case for backwards compatibility: 3801 * If there are two (or more) colons but no '[' and ']', 3802 * assume this is an inet6 address without a service. 3803 */ 3804 if (pe->pe_name != NULL) { 3805 #ifdef INET6 3806 if (pe->pe_name[0] == '[' && 3807 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 3808 pe->pe_name = &pe->pe_name[1]; 3809 *cp = '\0'; 3810 if (cp[1] == ':' && cp[2] != '\0') 3811 pe->pe_serv = cp + 2; 3812 } else { 3813 #endif 3814 cp = strchr(pe->pe_name, ':'); 3815 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 3816 *cp = '\0'; 3817 if (cp[1] != '\0') 3818 pe->pe_serv = cp + 1; 3819 if (cp == pe->pe_name) 3820 pe->pe_name = NULL; 3821 } 3822 #ifdef INET6 3823 } 3824 #endif 3825 } 3826 hints = (struct addrinfo){ 3827 .ai_family = AF_UNSPEC, 3828 .ai_socktype = SOCK_DGRAM, 3829 .ai_flags = AI_PASSIVE 3830 }; 3831 if (pe->pe_name != NULL) 3832 dprintf("Trying peer: %s\n", pe->pe_name); 3833 if (pe->pe_serv == NULL) 3834 pe->pe_serv = "syslog"; 3835 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 3836 if (error) { 3837 char *msgbuf; 3838 3839 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 3840 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 3841 gai_strerror(error)); 3842 errno = 0; 3843 if (msgbuf == NULL) 3844 logerror(gai_strerror(error)); 3845 else 3846 logerror(msgbuf); 3847 free(msgbuf); 3848 die(0); 3849 } 3850 for (res = res0; res != NULL; res = res->ai_next) { 3851 int s; 3852 3853 if (res->ai_family != AF_LOCAL && 3854 SecureMode > 1) { 3855 /* Only AF_LOCAL in secure mode. */ 3856 continue; 3857 } 3858 if (family != AF_UNSPEC && 3859 res->ai_family != AF_LOCAL && res->ai_family != family) 3860 continue; 3861 3862 s = socket(res->ai_family, res->ai_socktype, 3863 res->ai_protocol); 3864 if (s < 0) { 3865 logerror("socket"); 3866 error++; 3867 continue; 3868 } 3869 #ifdef INET6 3870 if (res->ai_family == AF_INET6) { 3871 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 3872 &(int){1}, sizeof(int)) < 0) { 3873 logerror("setsockopt(IPV6_V6ONLY)"); 3874 close(s); 3875 error++; 3876 continue; 3877 } 3878 } 3879 #endif 3880 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 3881 &(int){1}, sizeof(int)) < 0) { 3882 logerror("setsockopt(SO_REUSEADDR)"); 3883 close(s); 3884 error++; 3885 continue; 3886 } 3887 3888 /* 3889 * Bind INET and UNIX-domain sockets. 3890 * 3891 * A UNIX-domain socket is always bound to a pathname 3892 * regardless of -N flag. 3893 * 3894 * For INET sockets, RFC 3164 recommends that client 3895 * side message should come from the privileged syslogd port. 3896 * 3897 * If the system administrator chooses not to obey 3898 * this, we can skip the bind() step so that the 3899 * system will choose a port for us. 3900 */ 3901 if (res->ai_family == AF_LOCAL) 3902 unlink(pe->pe_name); 3903 if (res->ai_family == AF_LOCAL || 3904 NoBind == 0 || pe->pe_name != NULL) { 3905 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3906 logerror("bind"); 3907 close(s); 3908 error++; 3909 continue; 3910 } 3911 if (res->ai_family == AF_LOCAL || 3912 SecureMode == 0) 3913 increase_rcvbuf(s); 3914 } 3915 if (res->ai_family == AF_LOCAL && 3916 chmod(pe->pe_name, pe->pe_mode) < 0) { 3917 dprintf("chmod %s: %s\n", pe->pe_name, 3918 strerror(errno)); 3919 close(s); 3920 error++; 3921 continue; 3922 } 3923 dprintf("new socket fd is %d\n", s); 3924 if (res->ai_socktype != SOCK_DGRAM) { 3925 listen(s, 5); 3926 } 3927 sl_recv = socklist_recv_sock; 3928 #if defined(INET) || defined(INET6) 3929 if (SecureMode && (res->ai_family == AF_INET || 3930 res->ai_family == AF_INET6)) { 3931 dprintf("shutdown\n"); 3932 /* Forbid communication in secure mode. */ 3933 if (shutdown(s, SHUT_RD) < 0 && 3934 errno != ENOTCONN) { 3935 logerror("shutdown"); 3936 if (!Debug) 3937 die(0); 3938 } 3939 sl_recv = NULL; 3940 } else 3941 #endif 3942 dprintf("listening on socket\n"); 3943 dprintf("sending on socket\n"); 3944 addsock(res, &(struct socklist){ 3945 .sl_socket = s, 3946 .sl_peer = pe, 3947 .sl_recv = sl_recv 3948 }); 3949 } 3950 freeaddrinfo(res0); 3951 3952 return(error); 3953 } 3954 3955 static void 3956 increase_rcvbuf(int fd) 3957 { 3958 socklen_t len; 3959 3960 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3961 &(socklen_t){sizeof(len)}) == 0) { 3962 if (len < RCVBUF_MINSIZE) { 3963 len = RCVBUF_MINSIZE; 3964 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3965 } 3966 } 3967 } 3968