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 60static 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 67static 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/* Maximum number of characters in time of last occurrence */ 101#define MAXLINE 2048 /* maximum line length */ 102#define MAXSVLINE MAXLINE /* maximum saved line length */ 103#define DEFUPRI (LOG_USER|LOG_NOTICE) 104#define DEFSPRI (LOG_KERN|LOG_CRIT) 105#define TIMERINTVL 30 /* interval for checking flush, mark */ 106#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 107#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 108 109#include <sys/param.h> 110#include <sys/ioctl.h> 111#include <sys/mman.h> 112#include <sys/queue.h> 113#include <sys/resource.h> 114#include <sys/socket.h> 115#include <sys/stat.h> 116#include <sys/syslimits.h> 117#include <sys/time.h> 118#include <sys/uio.h> 119#include <sys/un.h> 120#include <sys/wait.h> 121 122#if defined(INET) || defined(INET6) 123#include <netinet/in.h> 124#include <arpa/inet.h> 125#endif 126 127#include <assert.h> 128#include <ctype.h> 129#include <dirent.h> 130#include <err.h> 131#include <errno.h> 132#include <fcntl.h> 133#include <fnmatch.h> 134#include <libutil.h> 135#include <limits.h> 136#include <netdb.h> 137#include <paths.h> 138#include <signal.h> 139#include <stdbool.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 154static const char *ConfFile = _PATH_LOGCONF; 155static const char *PidFile = _PATH_LOGPID; 156static const char ctty[] = _PATH_CONSOLE; 157static const char include_str[] = "include"; 158static 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 */ 182struct peer { 183 const char *pe_name; 184 const char *pe_serv; 185 mode_t pe_mode; 186 STAILQ_ENTRY(peer) next; 187}; 188static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 189 190struct socklist { 191 struct sockaddr_storage sl_ss; 192 int sl_socket; 193 struct peer *sl_peer; 194 int (*sl_recv)(struct socklist *); 195 STAILQ_ENTRY(socklist) next; 196}; 197static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 198 199/* 200 * Flags to logmsg(). 201 */ 202 203#define IGN_CONS 0x001 /* don't print on console */ 204#define SYNC_FILE 0x002 /* do fsync on file after printing */ 205#define MARK 0x008 /* this message is a mark */ 206 207/* Timestamps of log entries. */ 208struct logtime { 209 struct tm tm; 210 suseconds_t usec; 211}; 212 213/* Traditional syslog timestamp format. */ 214#define RFC3164_DATELEN 15 215#define RFC3164_DATEFMT "%b %e %H:%M:%S" 216 217/* 218 * This structure holds a property-based filter 219 */ 220 221struct prop_filter { 222 uint8_t prop_type; 223#define PROP_TYPE_NOOP 0 224#define PROP_TYPE_MSG 1 225#define PROP_TYPE_HOSTNAME 2 226#define PROP_TYPE_PROGNAME 3 227 228 uint8_t cmp_type; 229#define PROP_CMP_CONTAINS 1 230#define PROP_CMP_EQUAL 2 231#define PROP_CMP_STARTS 3 232#define PROP_CMP_REGEX 4 233 234 uint16_t cmp_flags; 235#define PROP_FLAG_EXCLUDE (1 << 0) 236#define PROP_FLAG_ICASE (1 << 1) 237 238 union { 239 char *p_strval; 240 regex_t *p_re; 241 } pflt_uniptr; 242#define pflt_strval pflt_uniptr.p_strval 243#define pflt_re pflt_uniptr.p_re 244 245 size_t pflt_strlen; 246}; 247 248/* 249 * This structure represents the files that will have log 250 * copies printed. 251 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 252 * or if f_type is F_PIPE and f_pid > 0. 253 */ 254 255struct filed { 256 STAILQ_ENTRY(filed) next; /* next in linked list */ 257 short f_type; /* entry type, see below */ 258 short f_file; /* file descriptor */ 259 time_t f_time; /* time this was last written */ 260 char *f_host; /* host from which to recd. */ 261 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 262 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 263#define PRI_LT 0x1 264#define PRI_EQ 0x2 265#define PRI_GT 0x4 266 char *f_program; /* program this applies to */ 267 struct prop_filter *f_prop_filter; /* property-based filter */ 268 union { 269 char f_uname[MAXUNAMES][MAXLOGNAME]; 270 struct { 271 char f_hname[MAXHOSTNAMELEN]; 272 struct addrinfo *f_addr; 273 274 } f_forw; /* forwarding address */ 275 char f_fname[MAXPATHLEN]; 276 struct { 277 char f_pname[MAXPATHLEN]; 278 pid_t f_pid; 279 } f_pipe; 280 } f_un; 281#define fu_uname f_un.f_uname 282#define fu_forw_hname f_un.f_forw.f_hname 283#define fu_forw_addr f_un.f_forw.f_addr 284#define fu_fname f_un.f_fname 285#define fu_pipe_pname f_un.f_pipe.f_pname 286#define fu_pipe_pid f_un.f_pipe.f_pid 287 char f_prevline[MAXSVLINE]; /* last message logged */ 288 struct logtime f_lasttime; /* time of last occurrence */ 289 int f_prevpri; /* pri of f_prevline */ 290 size_t f_prevlen; /* length of f_prevline */ 291 int f_prevcount; /* repetition cnt of prevline */ 292 u_int f_repeatcount; /* number of "repeated" msgs */ 293 int f_flags; /* file-specific flags */ 294#define FFLAG_SYNC 0x01 295#define FFLAG_NEEDSYNC 0x02 296}; 297 298/* 299 * Queue of about-to-be dead processes we should watch out for. 300 */ 301struct deadq_entry { 302 pid_t dq_pid; 303 int dq_timeout; 304 TAILQ_ENTRY(deadq_entry) dq_entries; 305}; 306static TAILQ_HEAD(, deadq_entry) deadq_head = 307 TAILQ_HEAD_INITIALIZER(deadq_head); 308 309/* 310 * The timeout to apply to processes waiting on the dead queue. Unit 311 * of measure is `mark intervals', i.e. 20 minutes by default. 312 * Processes on the dead queue will be terminated after that time. 313 */ 314 315#define DQ_TIMO_INIT 2 316 317/* 318 * Struct to hold records of network addresses that are allowed to log 319 * to us. 320 */ 321struct allowedpeer { 322 int isnumeric; 323 u_short port; 324 union { 325 struct { 326 struct sockaddr_storage addr; 327 struct sockaddr_storage mask; 328 } numeric; 329 char *name; 330 } u; 331#define a_addr u.numeric.addr 332#define a_mask u.numeric.mask 333#define a_name u.name 334 STAILQ_ENTRY(allowedpeer) next; 335}; 336static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 337 338 339/* 340 * Intervals at which we flush out "message repeated" messages, 341 * in seconds after previous message is logged. After each flush, 342 * we move to the next interval until we reach the largest. 343 */ 344static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 345#define MAXREPEAT (nitems(repeatinterval) - 1) 346#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 347#define BACKOFF(f) do { \ 348 if (++(f)->f_repeatcount > MAXREPEAT) \ 349 (f)->f_repeatcount = MAXREPEAT; \ 350 } while (0) 351 352/* values for f_type */ 353#define F_UNUSED 0 /* unused entry */ 354#define F_FILE 1 /* regular file */ 355#define F_TTY 2 /* terminal */ 356#define F_CONSOLE 3 /* console terminal */ 357#define F_FORW 4 /* remote machine */ 358#define F_USERS 5 /* list of users */ 359#define F_WALL 6 /* everyone logged on */ 360#define F_PIPE 7 /* pipe to program */ 361 362static const char *TypeNames[] = { 363 "UNUSED", "FILE", "TTY", "CONSOLE", 364 "FORW", "USERS", "WALL", "PIPE" 365}; 366 367static STAILQ_HEAD(, filed) fhead = 368 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 369static struct filed consfile; /* Console */ 370 371static int Debug; /* debug flag */ 372static int Foreground = 0; /* Run in foreground, instead of daemonizing */ 373static int resolve = 1; /* resolve hostname */ 374static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 375static const char *LocalDomain; /* our local domain name */ 376static int Initialized; /* set when we have initialized ourselves */ 377static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 378static int MarkSeq; /* mark sequence number */ 379static int NoBind; /* don't bind() as suggested by RFC 3164 */ 380static int SecureMode; /* when true, receive only unix domain socks */ 381#ifdef INET6 382static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 383#else 384static int family = PF_INET; /* protocol family (IPv4 only) */ 385#endif 386static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 387static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 388static int use_bootfile; /* log entire bootfile for every kern msg */ 389static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 390static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 391 392static char bootfile[MAXLINE+1]; /* booted kernel file */ 393 394static int RemoteAddDate; /* Always set the date on remote messages */ 395static int RemoteHostname; /* Log remote hostname from the message */ 396 397static int UniquePriority; /* Only log specified priority? */ 398static int LogFacPri; /* Put facility and priority in log message: */ 399 /* 0=no, 1=numeric, 2=names */ 400static int KeepKernFac; /* Keep remotely logged kernel facility */ 401static int needdofsync = 0; /* Are any file(s) waiting to be fsynced? */ 402static struct pidfh *pfh; 403static int sigpipe[2]; /* Pipe to catch a signal during select(). */ 404static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ 405 406static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild; 407 408struct iovlist; 409 410static int allowaddr(char *); 411static int addfile(struct filed *); 412static int addpeer(struct peer *); 413static int addsock(struct sockaddr *, socklen_t, struct socklist *); 414static struct filed *cfline(const char *, const char *, const char *, 415 const char *); 416static const char *cvthname(struct sockaddr *); 417static void deadq_enter(pid_t, const char *); 418static int deadq_remove(struct deadq_entry *); 419static int deadq_removebypid(pid_t); 420static int decode(const char *, const CODE *); 421static void die(int) __dead2; 422static void dodie(int); 423static void dofsync(void); 424static void domark(int); 425static void fprintlog_first(struct filed *, const char *, const char *, 426 const char *, const char *, const char *, const char *, int); 427static void fprintlog_write(struct filed *, struct iovlist *, int); 428static void fprintlog_successive(struct filed *, int); 429static void init(int); 430static void logerror(const char *); 431static void logmsg(int, const struct logtime *, const char *, const char *, 432 const char *, const char *, const char *, const char *, int); 433static void log_deadchild(pid_t, int, const char *); 434static void markit(void); 435static int socksetup(struct peer *); 436static int socklist_recv_file(struct socklist *); 437static int socklist_recv_sock(struct socklist *); 438static int socklist_recv_signal(struct socklist *); 439static void sighandler(int); 440static int skip_message(const char *, const char *, int); 441static int evaluate_prop_filter(const struct prop_filter *filter, 442 const char *value); 443static int prop_filter_compile(struct prop_filter *pfilter, 444 char *filterstr); 445static void parsemsg(const char *, char *); 446static void printsys(char *); 447static int p_open(const char *, pid_t *); 448static void reapchild(int); 449static const char *ttymsg_check(struct iovec *, int, char *, int); 450static void usage(void); 451static int validate(struct sockaddr *, const char *); 452static void unmapped(struct sockaddr *); 453static void wallmsg(struct filed *, struct iovec *, const int iovlen); 454static int waitdaemon(int); 455static void timedout(int); 456static void increase_rcvbuf(int); 457 458static void 459close_filed(struct filed *f) 460{ 461 462 if (f == NULL || f->f_file == -1) 463 return; 464 465 switch (f->f_type) { 466 case F_FORW: 467 if (f->f_un.f_forw.f_addr) { 468 freeaddrinfo(f->f_un.f_forw.f_addr); 469 f->f_un.f_forw.f_addr = NULL; 470 } 471 /* FALLTHROUGH */ 472 473 case F_FILE: 474 case F_TTY: 475 case F_CONSOLE: 476 f->f_type = F_UNUSED; 477 break; 478 case F_PIPE: 479 f->fu_pipe_pid = 0; 480 break; 481 } 482 (void)close(f->f_file); 483 f->f_file = -1; 484} 485 486static int 487addfile(struct filed *f0) 488{ 489 struct filed *f; 490 491 f = calloc(1, sizeof(*f)); 492 if (f == NULL) 493 err(1, "malloc failed"); 494 *f = *f0; 495 STAILQ_INSERT_TAIL(&fhead, f, next); 496 497 return (0); 498} 499 500static int 501addpeer(struct peer *pe0) 502{ 503 struct peer *pe; 504 505 pe = calloc(1, sizeof(*pe)); 506 if (pe == NULL) 507 err(1, "malloc failed"); 508 *pe = *pe0; 509 STAILQ_INSERT_TAIL(&pqueue, pe, next); 510 511 return (0); 512} 513 514static int 515addsock(struct sockaddr *sa, socklen_t sa_len, struct socklist *sl0) 516{ 517 struct socklist *sl; 518 519 sl = calloc(1, sizeof(*sl)); 520 if (sl == NULL) 521 err(1, "malloc failed"); 522 *sl = *sl0; 523 if (sa != NULL && sa_len > 0) 524 memcpy(&sl->sl_ss, sa, sa_len); 525 STAILQ_INSERT_TAIL(&shead, sl, next); 526 527 return (0); 528} 529 530int 531main(int argc, char *argv[]) 532{ 533 int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0; 534 fd_set *fdsr = NULL; 535 struct timeval tv, *tvp; 536 struct peer *pe; 537 struct socklist *sl; 538 pid_t ppid = 1, spid; 539 char *p; 540 541 if (madvise(NULL, 0, MADV_PROTECT) != 0) 542 dprintf("madvise() failed: %s\n", strerror(errno)); 543 544 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:m:nNoO:p:P:sS:Tuv")) 545 != -1) 546 switch (ch) { 547#ifdef INET 548 case '4': 549 family = PF_INET; 550 break; 551#endif 552#ifdef INET6 553 case '6': 554 family = PF_INET6; 555 break; 556#endif 557 case '8': 558 mask_C1 = 0; 559 break; 560 case 'A': 561 send_to_all++; 562 break; 563 case 'a': /* allow specific network addresses only */ 564 if (allowaddr(optarg) == -1) 565 usage(); 566 break; 567 case 'b': 568 bflag = 1; 569 p = strchr(optarg, ']'); 570 if (p != NULL) 571 p = strchr(p + 1, ':'); 572 else { 573 p = strchr(optarg, ':'); 574 if (p != NULL && strchr(p + 1, ':') != NULL) 575 p = NULL; /* backward compatibility */ 576 } 577 if (p == NULL) { 578 /* A hostname or filename only. */ 579 addpeer(&(struct peer){ 580 .pe_name = optarg, 581 .pe_serv = "syslog" 582 }); 583 } else { 584 /* The case of "name:service". */ 585 *p++ = '\0'; 586 addpeer(&(struct peer){ 587 .pe_serv = p, 588 .pe_name = (strlen(optarg) == 0) ? 589 NULL : optarg, 590 }); 591 } 592 break; 593 case 'c': 594 no_compress++; 595 break; 596 case 'C': 597 logflags |= O_CREAT; 598 break; 599 case 'd': /* debug */ 600 Debug++; 601 break; 602 case 'f': /* configuration file */ 603 ConfFile = optarg; 604 break; 605 case 'F': /* run in foreground instead of daemon */ 606 Foreground++; 607 break; 608 case 'H': 609 RemoteHostname = 1; 610 break; 611 case 'k': /* keep remote kern fac */ 612 KeepKernFac = 1; 613 break; 614 case 'l': 615 case 'p': 616 case 'S': 617 { 618 long perml; 619 mode_t mode; 620 char *name, *ep; 621 622 if (ch == 'l') 623 mode = DEFFILEMODE; 624 else if (ch == 'p') { 625 mode = DEFFILEMODE; 626 pflag = 1; 627 } else { 628 mode = S_IRUSR | S_IWUSR; 629 Sflag = 1; 630 } 631 if (optarg[0] == '/') 632 name = optarg; 633 else if ((name = strchr(optarg, ':')) != NULL) { 634 *name++ = '\0'; 635 if (name[0] != '/') 636 errx(1, "socket name must be absolute " 637 "path"); 638 if (isdigit(*optarg)) { 639 perml = strtol(optarg, &ep, 8); 640 if (*ep || perml < 0 || 641 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 642 errx(1, "invalid mode %s, exiting", 643 optarg); 644 mode = (mode_t )perml; 645 } else 646 errx(1, "invalid mode %s, exiting", 647 optarg); 648 } else 649 errx(1, "invalid filename %s, exiting", 650 optarg); 651 addpeer(&(struct peer){ 652 .pe_name = name, 653 .pe_mode = mode 654 }); 655 break; 656 } 657 case 'm': /* mark interval */ 658 MarkInterval = atoi(optarg) * 60; 659 break; 660 case 'N': 661 NoBind = 1; 662 SecureMode = 1; 663 break; 664 case 'n': 665 resolve = 0; 666 break; 667 case 'O': 668 if (strcmp(optarg, "bsd") == 0 || 669 strcmp(optarg, "rfc3164") == 0) 670 RFC3164OutputFormat = true; 671 else if (strcmp(optarg, "syslog") == 0 || 672 strcmp(optarg, "rfc5424") == 0) 673 RFC3164OutputFormat = false; 674 else 675 usage(); 676 break; 677 case 'o': 678 use_bootfile = 1; 679 break; 680 case 'P': /* path for alt. PID */ 681 PidFile = optarg; 682 break; 683 case 's': /* no network mode */ 684 SecureMode++; 685 break; 686 case 'T': 687 RemoteAddDate = 1; 688 break; 689 case 'u': /* only log specified priority */ 690 UniquePriority++; 691 break; 692 case 'v': /* log facility and priority */ 693 LogFacPri++; 694 break; 695 default: 696 usage(); 697 } 698 if ((argc -= optind) != 0) 699 usage(); 700 701 /* Pipe to catch a signal during select(). */ 702 s = pipe2(sigpipe, O_CLOEXEC); 703 if (s < 0) { 704 err(1, "cannot open a pipe for signals"); 705 } else { 706 addsock(NULL, 0, &(struct socklist){ 707 .sl_socket = sigpipe[0], 708 .sl_recv = socklist_recv_signal 709 }); 710 } 711 712 /* Listen by default: /dev/klog. */ 713 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 714 if (s < 0) { 715 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 716 } else { 717 addsock(NULL, 0, &(struct socklist){ 718 .sl_socket = s, 719 .sl_recv = socklist_recv_file, 720 }); 721 } 722 /* Listen by default: *:514 if no -b flag. */ 723 if (bflag == 0) 724 addpeer(&(struct peer){ 725 .pe_serv = "syslog" 726 }); 727 /* Listen by default: /var/run/log if no -p flag. */ 728 if (pflag == 0) 729 addpeer(&(struct peer){ 730 .pe_name = _PATH_LOG, 731 .pe_mode = DEFFILEMODE, 732 }); 733 /* Listen by default: /var/run/logpriv if no -S flag. */ 734 if (Sflag == 0) 735 addpeer(&(struct peer){ 736 .pe_name = _PATH_LOG_PRIV, 737 .pe_mode = S_IRUSR | S_IWUSR, 738 }); 739 STAILQ_FOREACH(pe, &pqueue, next) 740 socksetup(pe); 741 742 pfh = pidfile_open(PidFile, 0600, &spid); 743 if (pfh == NULL) { 744 if (errno == EEXIST) 745 errx(1, "syslogd already running, pid: %d", spid); 746 warn("cannot open pid file"); 747 } 748 749 if ((!Foreground) && (!Debug)) { 750 ppid = waitdaemon(30); 751 if (ppid < 0) { 752 warn("could not become daemon"); 753 pidfile_remove(pfh); 754 exit(1); 755 } 756 } else if (Debug) 757 setlinebuf(stdout); 758 759 consfile.f_type = F_CONSOLE; 760 (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1, 761 sizeof(consfile.fu_fname)); 762 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 763 (void)signal(SIGTERM, dodie); 764 (void)signal(SIGINT, Debug ? dodie : SIG_IGN); 765 (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN); 766 (void)signal(SIGHUP, sighandler); 767 (void)signal(SIGCHLD, sighandler); 768 (void)signal(SIGALRM, domark); 769 (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */ 770 (void)alarm(TIMERINTVL); 771 772 /* tuck my process id away */ 773 pidfile_write(pfh); 774 775 dprintf("off & running....\n"); 776 777 tvp = &tv; 778 tv.tv_sec = tv.tv_usec = 0; 779 780 STAILQ_FOREACH(sl, &shead, next) { 781 if (sl->sl_socket > fdsrmax) 782 fdsrmax = sl->sl_socket; 783 } 784 fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS), 785 sizeof(*fdsr)); 786 if (fdsr == NULL) 787 errx(1, "calloc fd_set"); 788 789 for (;;) { 790 if (Initialized == 0) 791 init(0); 792 else if (WantInitialize) 793 init(WantInitialize); 794 if (WantReapchild) 795 reapchild(WantReapchild); 796 if (MarkSet) 797 markit(); 798 if (WantDie) { 799 free(fdsr); 800 die(WantDie); 801 } 802 803 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) * 804 sizeof(*fdsr)); 805 806 STAILQ_FOREACH(sl, &shead, next) { 807 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 808 FD_SET(sl->sl_socket, fdsr); 809 } 810 i = select(fdsrmax + 1, fdsr, NULL, NULL, 811 needdofsync ? &tv : tvp); 812 switch (i) { 813 case 0: 814 dofsync(); 815 needdofsync = 0; 816 if (tvp) { 817 tvp = NULL; 818 if (ppid != 1) 819 kill(ppid, SIGALRM); 820 } 821 continue; 822 case -1: 823 if (errno != EINTR) 824 logerror("select"); 825 continue; 826 } 827 STAILQ_FOREACH(sl, &shead, next) { 828 if (FD_ISSET(sl->sl_socket, fdsr)) 829 (*sl->sl_recv)(sl); 830 } 831 } 832 free(fdsr); 833} 834 835static int 836socklist_recv_signal(struct socklist *sl __unused) 837{ 838 ssize_t len; 839 int i, nsig, signo; 840 841 if (ioctl(sigpipe[0], FIONREAD, &i) != 0) { 842 logerror("ioctl(FIONREAD)"); 843 err(1, "signal pipe read failed"); 844 } 845 nsig = i / sizeof(signo); 846 dprintf("# of received signals = %d\n", nsig); 847 for (i = 0; i < nsig; i++) { 848 len = read(sigpipe[0], &signo, sizeof(signo)); 849 if (len != sizeof(signo)) { 850 logerror("signal pipe read failed"); 851 err(1, "signal pipe read failed"); 852 } 853 dprintf("Received signal: %d from fd=%d\n", signo, 854 sigpipe[0]); 855 switch (signo) { 856 case SIGHUP: 857 WantInitialize = 1; 858 break; 859 case SIGCHLD: 860 WantReapchild = 1; 861 break; 862 } 863 } 864 return (0); 865} 866 867static int 868socklist_recv_sock(struct socklist *sl) 869{ 870 struct sockaddr_storage ss; 871 struct sockaddr *sa = (struct sockaddr *)&ss; 872 socklen_t sslen; 873 const char *hname; 874 char line[MAXLINE + 1]; 875 int len; 876 877 sslen = sizeof(ss); 878 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 879 dprintf("received sa_len = %d\n", sslen); 880 if (len == 0) 881 return (-1); 882 if (len < 0) { 883 if (errno != EINTR) 884 logerror("recvfrom"); 885 return (-1); 886 } 887 /* Received valid data. */ 888 line[len] = '\0'; 889 if (sl->sl_ss.ss_family == AF_LOCAL) 890 hname = LocalHostName; 891 else { 892 hname = cvthname(sa); 893 unmapped(sa); 894 if (validate(sa, hname) == 0) { 895 dprintf("Message from %s was ignored.", hname); 896 return (-1); 897 } 898 } 899 parsemsg(hname, line); 900 901 return (0); 902} 903 904static void 905unmapped(struct sockaddr *sa) 906{ 907#if defined(INET) && defined(INET6) 908 struct sockaddr_in6 *sin6; 909 struct sockaddr_in sin; 910 911 if (sa == NULL || 912 sa->sa_family != AF_INET6 || 913 sa->sa_len != sizeof(*sin6)) 914 return; 915 sin6 = satosin6(sa); 916 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 917 return; 918 sin = (struct sockaddr_in){ 919 .sin_family = AF_INET, 920 .sin_len = sizeof(sin), 921 .sin_port = sin6->sin6_port 922 }; 923 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 924 sizeof(sin.sin_addr)); 925 memcpy(sa, &sin, sizeof(sin)); 926#else 927 if (sa == NULL) 928 return; 929#endif 930} 931 932static void 933usage(void) 934{ 935 936 fprintf(stderr, 937 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 938 " [-b bind_address] [-f config_file]\n" 939 " [-l [mode:]path] [-m mark_interval]\n" 940 " [-O format] [-P pid_file] [-p log_socket]\n" 941 " [-S logpriv_socket]\n"); 942 exit(1); 943} 944 945/* 946 * Removes characters from log messages that are unsafe to display. 947 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 948 */ 949static void 950parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 951{ 952 char *q; 953 int c; 954 955 q = out; 956 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 957 if (mask_C1 && (c & 0x80) && c < 0xA0) { 958 c &= 0x7F; 959 *q++ = 'M'; 960 *q++ = '-'; 961 } 962 if (isascii(c) && iscntrl(c)) { 963 if (c == '\n') { 964 *q++ = ' '; 965 } else if (c == '\t') { 966 *q++ = '\t'; 967 } else { 968 *q++ = '^'; 969 *q++ = c ^ 0100; 970 } 971 } else { 972 *q++ = c; 973 } 974 } 975 *q = '\0'; 976} 977 978/* 979 * Parses a syslog message according to RFC 5424, assuming that PRI and 980 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 981 * parsed result is passed to logmsg(). 982 */ 983static void 984parsemsg_rfc5424(const char *from, int pri, char *msg) 985{ 986 const struct logtime *timestamp; 987 struct logtime timestamp_remote; 988 const char *omsg, *hostname, *app_name, *procid, *msgid, 989 *structured_data; 990 char line[MAXLINE + 1]; 991 992#define FAIL_IF(field, expr) do { \ 993 if (expr) { \ 994 dprintf("Failed to parse " field " from %s: %s\n", \ 995 from, omsg); \ 996 return; \ 997 } \ 998} while (0) 999#define PARSE_CHAR(field, sep) do { \ 1000 FAIL_IF(field, *msg != sep); \ 1001 ++msg; \ 1002} while (0) 1003#define IF_NOT_NILVALUE(var) \ 1004 if (msg[0] == '-' && msg[1] == ' ') { \ 1005 msg += 2; \ 1006 var = NULL; \ 1007 } else if (msg[0] == '-' && msg[1] == '\0') { \ 1008 ++msg; \ 1009 var = NULL; \ 1010 } else 1011 1012 omsg = msg; 1013 IF_NOT_NILVALUE(timestamp) { 1014 /* Parse RFC 3339-like timestamp. */ 1015#define PARSE_NUMBER(dest, length, min, max) do { \ 1016 int i, v; \ 1017 \ 1018 v = 0; \ 1019 for (i = 0; i < length; ++i) { \ 1020 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 1021 v = v * 10 + *msg++ - '0'; \ 1022 } \ 1023 FAIL_IF("TIMESTAMP", v < min || v > max); \ 1024 dest = v; \ 1025} while (0) 1026 /* Date and time. */ 1027 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 1028 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 1029 timestamp_remote.tm.tm_year -= 1900; 1030 PARSE_CHAR("TIMESTAMP", '-'); 1031 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 1032 --timestamp_remote.tm.tm_mon; 1033 PARSE_CHAR("TIMESTAMP", '-'); 1034 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 1035 PARSE_CHAR("TIMESTAMP", 'T'); 1036 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 1037 PARSE_CHAR("TIMESTAMP", ':'); 1038 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1039 PARSE_CHAR("TIMESTAMP", ':'); 1040 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1041 /* Perform normalization. */ 1042 timegm(×tamp_remote.tm); 1043 /* Optional: fractional seconds. */ 1044 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1045 int i; 1046 1047 ++msg; 1048 for (i = 100000; i != 0; i /= 10) { 1049 if (*msg < '0' || *msg > '9') 1050 break; 1051 timestamp_remote.usec += (*msg++ - '0') * i; 1052 } 1053 } 1054 /* Timezone. */ 1055 if (*msg == 'Z') { 1056 /* UTC. */ 1057 ++msg; 1058 } else { 1059 int sign, tz_hour, tz_min; 1060 1061 /* Local time zone offset. */ 1062 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1063 sign = *msg++ == '-' ? -1 : 1; 1064 PARSE_NUMBER(tz_hour, 2, 0, 23); 1065 PARSE_CHAR("TIMESTAMP", ':'); 1066 PARSE_NUMBER(tz_min, 2, 0, 59); 1067 timestamp_remote.tm.tm_gmtoff = 1068 sign * (tz_hour * 3600 + tz_min * 60); 1069 } 1070#undef PARSE_NUMBER 1071 PARSE_CHAR("TIMESTAMP", ' '); 1072 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1073 } 1074 1075 /* String fields part of the HEADER. */ 1076#define PARSE_STRING(field, var) \ 1077 IF_NOT_NILVALUE(var) { \ 1078 var = msg; \ 1079 while (*msg >= '!' && *msg <= '~') \ 1080 ++msg; \ 1081 FAIL_IF(field, var == msg); \ 1082 PARSE_CHAR(field, ' '); \ 1083 msg[-1] = '\0'; \ 1084 } 1085 PARSE_STRING("HOSTNAME", hostname); 1086 if (hostname == NULL || !RemoteHostname) 1087 hostname = from; 1088 PARSE_STRING("APP-NAME", app_name); 1089 PARSE_STRING("PROCID", procid); 1090 PARSE_STRING("MSGID", msgid); 1091#undef PARSE_STRING 1092 1093 /* Structured data. */ 1094#define PARSE_SD_NAME() do { \ 1095 const char *start; \ 1096 \ 1097 start = msg; \ 1098 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1099 *msg != ']' && *msg != '"') \ 1100 ++msg; \ 1101 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1102} while (0) 1103 IF_NOT_NILVALUE(structured_data) { 1104 /* SD-ELEMENT. */ 1105 while (*msg == '[') { 1106 ++msg; 1107 /* SD-ID. */ 1108 PARSE_SD_NAME(); 1109 /* SD-PARAM. */ 1110 while (*msg == ' ') { 1111 ++msg; 1112 /* PARAM-NAME. */ 1113 PARSE_SD_NAME(); 1114 PARSE_CHAR("STRUCTURED-NAME", '='); 1115 PARSE_CHAR("STRUCTURED-NAME", '"'); 1116 while (*msg != '"') { 1117 FAIL_IF("STRUCTURED-NAME", 1118 *msg == '\0'); 1119 if (*msg++ == '\\') { 1120 FAIL_IF("STRUCTURED-NAME", 1121 *msg == '\0'); 1122 ++msg; 1123 } 1124 } 1125 ++msg; 1126 } 1127 PARSE_CHAR("STRUCTURED-NAME", ']'); 1128 } 1129 PARSE_CHAR("STRUCTURED-NAME", ' '); 1130 msg[-1] = '\0'; 1131 } 1132#undef PARSE_SD_NAME 1133 1134#undef FAIL_IF 1135#undef PARSE_CHAR 1136#undef IF_NOT_NILVALUE 1137 1138 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1139 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1140 structured_data, line, 0); 1141} 1142 1143/* 1144 * Trims the application name ("TAG" in RFC 3164 terminology) and 1145 * process ID from a message if present. 1146 */ 1147static void 1148parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1149 const char **procid) { 1150 char *m, *app_name_begin, *procid_begin; 1151 size_t app_name_length, procid_length; 1152 1153 m = *msg; 1154 1155 /* Application name. */ 1156 app_name_begin = m; 1157 app_name_length = strspn(m, 1158 "abcdefghijklmnopqrstuvwxyz" 1159 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1160 "0123456789" 1161 "_-/"); 1162 if (app_name_length == 0) 1163 goto bad; 1164 m += app_name_length; 1165 1166 /* Process identifier (optional). */ 1167 if (*m == '[') { 1168 procid_begin = ++m; 1169 procid_length = strspn(m, "0123456789"); 1170 if (procid_length == 0) 1171 goto bad; 1172 m += procid_length; 1173 if (*m++ != ']') 1174 goto bad; 1175 } else { 1176 procid_begin = NULL; 1177 procid_length = 0; 1178 } 1179 1180 /* Separator. */ 1181 if (m[0] != ':' || m[1] != ' ') 1182 goto bad; 1183 1184 /* Split strings from input. */ 1185 app_name_begin[app_name_length] = '\0'; 1186 if (procid_begin != 0) 1187 procid_begin[procid_length] = '\0'; 1188 1189 *msg = m + 2; 1190 *app_name = app_name_begin; 1191 *procid = procid_begin; 1192 return; 1193bad: 1194 *app_name = NULL; 1195 *procid = NULL; 1196} 1197 1198/* 1199 * Parses a syslog message according to RFC 3164, assuming that PRI 1200 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1201 * result is passed to logmsg(). 1202 */ 1203static void 1204parsemsg_rfc3164(const char *from, int pri, char *msg) 1205{ 1206 struct tm tm_parsed; 1207 const struct logtime *timestamp; 1208 struct logtime timestamp_remote; 1209 const char *app_name, *procid; 1210 size_t i, msglen; 1211 char line[MAXLINE + 1]; 1212 1213 /* 1214 * Parse the TIMESTAMP provided by the remote side. If none is 1215 * found, assume this is not an RFC 3164 formatted message, 1216 * only containing a TAG and a MSG. 1217 */ 1218 timestamp = NULL; 1219 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1220 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1221 msg += RFC3164_DATELEN + 1; 1222 if (!RemoteAddDate) { 1223 struct tm tm_now; 1224 time_t t_now; 1225 int year; 1226 1227 /* 1228 * As the timestamp does not contain the year 1229 * number, daylight saving time information, nor 1230 * a time zone, attempt to infer it. Due to 1231 * clock skews, the timestamp may even be part 1232 * of the next year. Use the last year for which 1233 * the timestamp is at most one week in the 1234 * future. 1235 * 1236 * This loop can only run for at most three 1237 * iterations before terminating. 1238 */ 1239 t_now = time(NULL); 1240 localtime_r(&t_now, &tm_now); 1241 for (year = tm_now.tm_year + 1;; --year) { 1242 assert(year >= tm_now.tm_year - 1); 1243 timestamp_remote.tm = tm_parsed; 1244 timestamp_remote.tm.tm_year = year; 1245 timestamp_remote.tm.tm_isdst = -1; 1246 timestamp_remote.usec = 0; 1247 if (mktime(×tamp_remote.tm) < 1248 t_now + 7 * 24 * 60 * 60) 1249 break; 1250 } 1251 timestamp = ×tamp_remote; 1252 } 1253 1254 /* 1255 * A single space character MUST also follow the HOSTNAME field. 1256 */ 1257 msglen = strlen(msg); 1258 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1259 if (msg[i] == ' ') { 1260 if (RemoteHostname) { 1261 msg[i] = '\0'; 1262 from = msg; 1263 } 1264 msg += i + 1; 1265 break; 1266 } 1267 /* 1268 * Support non RFC compliant messages, without hostname. 1269 */ 1270 if (msg[i] == ':') 1271 break; 1272 } 1273 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1274 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1275 return; 1276 } 1277 } 1278 1279 /* Remove the TAG, if present. */ 1280 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1281 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1282 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1283} 1284 1285/* 1286 * Takes a raw input line, extracts PRI and determines whether the 1287 * message is formatted according to RFC 3164 or RFC 5424. Continues 1288 * parsing of addition fields in the message according to those 1289 * standards and prints the message on the appropriate log files. 1290 */ 1291static void 1292parsemsg(const char *from, char *msg) 1293{ 1294 char *q; 1295 long n; 1296 size_t i; 1297 int pri; 1298 1299 /* Parse PRI. */ 1300 if (msg[0] != '<' || !isdigit(msg[1])) { 1301 dprintf("Invalid PRI from %s\n", from); 1302 return; 1303 } 1304 for (i = 2; i <= 4; i++) { 1305 if (msg[i] == '>') 1306 break; 1307 if (!isdigit(msg[i])) { 1308 dprintf("Invalid PRI header from %s\n", from); 1309 return; 1310 } 1311 } 1312 if (msg[i] != '>') { 1313 dprintf("Invalid PRI header from %s\n", from); 1314 return; 1315 } 1316 errno = 0; 1317 n = strtol(msg + 1, &q, 10); 1318 if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) { 1319 dprintf("Invalid PRI %ld from %s: %s\n", 1320 n, from, strerror(errno)); 1321 return; 1322 } 1323 pri = n; 1324 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1325 pri = DEFUPRI; 1326 1327 /* 1328 * Don't allow users to log kernel messages. 1329 * NOTE: since LOG_KERN == 0 this will also match 1330 * messages with no facility specified. 1331 */ 1332 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1333 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1334 1335 /* Parse VERSION. */ 1336 msg += i + 1; 1337 if (msg[0] == '1' && msg[1] == ' ') 1338 parsemsg_rfc5424(from, pri, msg + 2); 1339 else 1340 parsemsg_rfc3164(from, pri, msg); 1341} 1342 1343/* 1344 * Read /dev/klog while data are available, split into lines. 1345 */ 1346static int 1347socklist_recv_file(struct socklist *sl) 1348{ 1349 char *p, *q, line[MAXLINE + 1]; 1350 int len, i; 1351 1352 len = 0; 1353 for (;;) { 1354 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1355 if (i > 0) { 1356 line[i + len] = '\0'; 1357 } else { 1358 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1359 logerror("klog"); 1360 close(sl->sl_socket); 1361 sl->sl_socket = -1; 1362 } 1363 break; 1364 } 1365 1366 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1367 *q = '\0'; 1368 printsys(p); 1369 } 1370 len = strlen(p); 1371 if (len >= MAXLINE - 1) { 1372 printsys(p); 1373 len = 0; 1374 } 1375 if (len > 0) 1376 memmove(line, p, len + 1); 1377 } 1378 if (len > 0) 1379 printsys(line); 1380 1381 return (len); 1382} 1383 1384/* 1385 * Take a raw input line from /dev/klog, format similar to syslog(). 1386 */ 1387static void 1388printsys(char *msg) 1389{ 1390 char *p, *q; 1391 long n; 1392 int flags, isprintf, pri; 1393 1394 flags = SYNC_FILE; /* fsync after write */ 1395 p = msg; 1396 pri = DEFSPRI; 1397 isprintf = 1; 1398 if (*p == '<') { 1399 errno = 0; 1400 n = strtol(p + 1, &q, 10); 1401 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1402 p = q + 1; 1403 pri = n; 1404 isprintf = 0; 1405 } 1406 } 1407 /* 1408 * Kernel printf's and LOG_CONSOLE messages have been displayed 1409 * on the console already. 1410 */ 1411 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1412 flags |= IGN_CONS; 1413 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1414 pri = DEFSPRI; 1415 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1416} 1417 1418static time_t now; 1419 1420/* 1421 * Match a program or host name against a specification. 1422 * Return a non-0 value if the message must be ignored 1423 * based on the specification. 1424 */ 1425static int 1426skip_message(const char *name, const char *spec, int checkcase) 1427{ 1428 const char *s; 1429 char prev, next; 1430 int exclude = 0; 1431 /* Behaviour on explicit match */ 1432 1433 if (spec == NULL) 1434 return 0; 1435 switch (*spec) { 1436 case '-': 1437 exclude = 1; 1438 /*FALLTHROUGH*/ 1439 case '+': 1440 spec++; 1441 break; 1442 default: 1443 break; 1444 } 1445 if (checkcase) 1446 s = strstr (spec, name); 1447 else 1448 s = strcasestr (spec, name); 1449 1450 if (s != NULL) { 1451 prev = (s == spec ? ',' : *(s - 1)); 1452 next = *(s + strlen (name)); 1453 1454 if (prev == ',' && (next == '\0' || next == ',')) 1455 /* Explicit match: skip iff the spec is an 1456 exclusive one. */ 1457 return exclude; 1458 } 1459 1460 /* No explicit match for this name: skip the message iff 1461 the spec is an inclusive one. */ 1462 return !exclude; 1463} 1464 1465/* 1466 * Match some property of the message against a filter. 1467 * Return a non-0 value if the message must be ignored 1468 * based on the filter. 1469 */ 1470static int 1471evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1472{ 1473 const char *s = NULL; 1474 const int exclude = ((filter->cmp_flags & PROP_FLAG_EXCLUDE) > 0); 1475 size_t valuelen; 1476 1477 if (value == NULL) 1478 return (-1); 1479 1480 if (filter->cmp_type == PROP_CMP_REGEX) { 1481 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1482 return (exclude); 1483 else 1484 return (!exclude); 1485 } 1486 1487 valuelen = strlen(value); 1488 1489 /* a shortcut for equal with different length is always false */ 1490 if (filter->cmp_type == PROP_CMP_EQUAL && 1491 valuelen != filter->pflt_strlen) 1492 return (!exclude); 1493 1494 if (filter->cmp_flags & PROP_FLAG_ICASE) 1495 s = strcasestr(value, filter->pflt_strval); 1496 else 1497 s = strstr(value, filter->pflt_strval); 1498 1499 /* 1500 * PROP_CMP_CONTAINS true if s 1501 * PROP_CMP_STARTS true if s && s == value 1502 * PROP_CMP_EQUAL true if s && s == value && 1503 * valuelen == filter->pflt_strlen 1504 * (and length match is checked 1505 * already) 1506 */ 1507 1508 switch (filter->cmp_type) { 1509 case PROP_CMP_STARTS: 1510 case PROP_CMP_EQUAL: 1511 if (s != value) 1512 return (!exclude); 1513 /* FALLTHROUGH */ 1514 case PROP_CMP_CONTAINS: 1515 if (s) 1516 return (exclude); 1517 else 1518 return (!exclude); 1519 break; 1520 default: 1521 /* unknown cmp_type */ 1522 break; 1523 } 1524 1525 return (-1); 1526} 1527 1528/* 1529 * Logs a message to the appropriate log files, users, etc. based on the 1530 * priority. Log messages are always formatted according to RFC 3164, 1531 * even if they were in RFC 5424 format originally, The MSGID and 1532 * STRUCTURED-DATA fields are thus discarded for the time being. 1533 */ 1534static void 1535logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1536 const char *app_name, const char *procid, const char *msgid, 1537 const char *structured_data, const char *msg, int flags) 1538{ 1539 struct timeval tv; 1540 struct logtime timestamp_now; 1541 struct filed *f; 1542 size_t savedlen; 1543 int fac, prilev; 1544 char saved[MAXSVLINE]; 1545 1546 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1547 pri, flags, hostname, msg); 1548 1549 (void)gettimeofday(&tv, NULL); 1550 now = tv.tv_sec; 1551 if (timestamp == NULL) { 1552 localtime_r(&now, ×tamp_now.tm); 1553 timestamp_now.usec = tv.tv_usec; 1554 timestamp = ×tamp_now; 1555 } 1556 1557 /* extract facility and priority level */ 1558 if (flags & MARK) 1559 fac = LOG_NFACILITIES; 1560 else 1561 fac = LOG_FAC(pri); 1562 1563 /* Check maximum facility number. */ 1564 if (fac > LOG_NFACILITIES) 1565 return; 1566 1567 prilev = LOG_PRI(pri); 1568 1569 /* log the message to the particular outputs */ 1570 if (!Initialized) { 1571 f = &consfile; 1572 /* 1573 * Open in non-blocking mode to avoid hangs during open 1574 * and close(waiting for the port to drain). 1575 */ 1576 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0); 1577 1578 if (f->f_file >= 0) { 1579 f->f_lasttime = *timestamp; 1580 fprintlog_first(f, hostname, app_name, procid, msgid, 1581 structured_data, msg, flags); 1582 close(f->f_file); 1583 f->f_file = -1; 1584 } 1585 return; 1586 } 1587 1588 /* 1589 * Store all of the fields of the message, except the timestamp, 1590 * in a single string. This string is used to detect duplicate 1591 * messages. 1592 */ 1593 assert(hostname != NULL); 1594 assert(msg != NULL); 1595 savedlen = snprintf(saved, sizeof(saved), 1596 "%d %s %s %s %s %s %s", pri, hostname, 1597 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1598 msgid == NULL ? "-" : msgid, 1599 structured_data == NULL ? "-" : structured_data, msg); 1600 1601 STAILQ_FOREACH(f, &fhead, next) { 1602 /* skip messages that are incorrect priority */ 1603 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1604 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1605 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1606 ) 1607 || f->f_pmask[fac] == INTERNAL_NOPRI) 1608 continue; 1609 1610 /* skip messages with the incorrect hostname */ 1611 if (skip_message(hostname, f->f_host, 0)) 1612 continue; 1613 1614 /* skip messages with the incorrect program name */ 1615 if (skip_message(app_name == NULL ? "" : app_name, 1616 f->f_program, 1)) 1617 continue; 1618 1619 /* skip messages if a property does not match filter */ 1620 if (f->f_prop_filter != NULL && 1621 f->f_prop_filter->prop_type != PROP_TYPE_NOOP) { 1622 switch (f->f_prop_filter->prop_type) { 1623 case PROP_TYPE_MSG: 1624 if (evaluate_prop_filter(f->f_prop_filter, 1625 msg)) 1626 continue; 1627 break; 1628 case PROP_TYPE_HOSTNAME: 1629 if (evaluate_prop_filter(f->f_prop_filter, 1630 hostname)) 1631 continue; 1632 break; 1633 case PROP_TYPE_PROGNAME: 1634 if (evaluate_prop_filter(f->f_prop_filter, 1635 app_name == NULL ? "" : app_name)) 1636 continue; 1637 break; 1638 default: 1639 continue; 1640 } 1641 } 1642 1643 /* skip message to console if it has already been printed */ 1644 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1645 continue; 1646 1647 /* don't output marks to recently written files */ 1648 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1649 continue; 1650 1651 /* 1652 * suppress duplicate lines to this file 1653 */ 1654 if (no_compress - (f->f_type != F_PIPE) < 1 && 1655 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1656 strcmp(saved, f->f_prevline) == 0) { 1657 f->f_lasttime = *timestamp; 1658 f->f_prevcount++; 1659 dprintf("msg repeated %d times, %ld sec of %d\n", 1660 f->f_prevcount, (long)(now - f->f_time), 1661 repeatinterval[f->f_repeatcount]); 1662 /* 1663 * If domark would have logged this by now, 1664 * flush it now (so we don't hold isolated messages), 1665 * but back off so we'll flush less often 1666 * in the future. 1667 */ 1668 if (now > REPEATTIME(f)) { 1669 fprintlog_successive(f, flags); 1670 BACKOFF(f); 1671 } 1672 } else { 1673 /* new line, save it */ 1674 if (f->f_prevcount) 1675 fprintlog_successive(f, 0); 1676 f->f_repeatcount = 0; 1677 f->f_prevpri = pri; 1678 f->f_lasttime = *timestamp; 1679 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1680 "Space to store saved line incorrect"); 1681 (void)strcpy(f->f_prevline, saved); 1682 f->f_prevlen = savedlen; 1683 fprintlog_first(f, hostname, app_name, procid, msgid, 1684 structured_data, msg, flags); 1685 } 1686 } 1687} 1688 1689static void 1690dofsync(void) 1691{ 1692 struct filed *f; 1693 1694 STAILQ_FOREACH(f, &fhead, next) { 1695 if ((f->f_type == F_FILE) && 1696 (f->f_flags & FFLAG_NEEDSYNC)) { 1697 f->f_flags &= ~FFLAG_NEEDSYNC; 1698 (void)fsync(f->f_file); 1699 } 1700 } 1701} 1702 1703/* 1704 * List of iovecs to which entries can be appended. 1705 * Used for constructing the message to be logged. 1706 */ 1707struct iovlist { 1708 struct iovec iov[TTYMSG_IOV_MAX]; 1709 size_t iovcnt; 1710 size_t totalsize; 1711}; 1712 1713static void 1714iovlist_init(struct iovlist *il) 1715{ 1716 1717 il->iovcnt = 0; 1718 il->totalsize = 0; 1719} 1720 1721static void 1722iovlist_append(struct iovlist *il, const char *str) 1723{ 1724 size_t size; 1725 1726 /* Discard components if we've run out of iovecs. */ 1727 if (il->iovcnt < nitems(il->iov)) { 1728 size = strlen(str); 1729 il->iov[il->iovcnt++] = (struct iovec){ 1730 .iov_base = __DECONST(char *, str), 1731 .iov_len = size, 1732 }; 1733 il->totalsize += size; 1734 } 1735} 1736 1737#if defined(INET) || defined(INET6) 1738static void 1739iovlist_truncate(struct iovlist *il, size_t size) 1740{ 1741 struct iovec *last; 1742 size_t diff; 1743 1744 while (il->totalsize > size) { 1745 diff = il->totalsize - size; 1746 last = &il->iov[il->iovcnt - 1]; 1747 if (diff >= last->iov_len) { 1748 /* Remove the last iovec entirely. */ 1749 --il->iovcnt; 1750 il->totalsize -= last->iov_len; 1751 } else { 1752 /* Remove the last iovec partially. */ 1753 last->iov_len -= diff; 1754 il->totalsize -= diff; 1755 } 1756 } 1757} 1758#endif 1759 1760static void 1761fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1762{ 1763 struct msghdr msghdr; 1764 struct addrinfo *r; 1765 struct socklist *sl; 1766 const char *msgret; 1767 ssize_t lsent; 1768 1769 switch (f->f_type) { 1770 case F_FORW: 1771 /* Truncate messages to RFC 5426 recommended size. */ 1772 dprintf(" %s", f->fu_forw_hname); 1773 switch (f->fu_forw_addr->ai_addr->sa_family) { 1774#ifdef INET 1775 case AF_INET: 1776 dprintf(":%d\n", 1777 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1778 iovlist_truncate(il, 480); 1779 break; 1780#endif 1781#ifdef INET6 1782 case AF_INET6: 1783 dprintf(":%d\n", 1784 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1785 iovlist_truncate(il, 1180); 1786 break; 1787#endif 1788 default: 1789 dprintf("\n"); 1790 } 1791 1792 lsent = 0; 1793 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1794 memset(&msghdr, 0, sizeof(msghdr)); 1795 msghdr.msg_name = r->ai_addr; 1796 msghdr.msg_namelen = r->ai_addrlen; 1797 msghdr.msg_iov = il->iov; 1798 msghdr.msg_iovlen = il->iovcnt; 1799 STAILQ_FOREACH(sl, &shead, next) { 1800 if (sl->sl_ss.ss_family == AF_LOCAL || 1801 sl->sl_ss.ss_family == AF_UNSPEC || 1802 sl->sl_socket < 0) 1803 continue; 1804 lsent = sendmsg(sl->sl_socket, &msghdr, 0); 1805 if (lsent == (ssize_t)il->totalsize) 1806 break; 1807 } 1808 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1809 break; 1810 } 1811 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1812 if (lsent != (ssize_t)il->totalsize) { 1813 int e = errno; 1814 logerror("sendto"); 1815 errno = e; 1816 switch (errno) { 1817 case ENOBUFS: 1818 case ENETDOWN: 1819 case ENETUNREACH: 1820 case EHOSTUNREACH: 1821 case EHOSTDOWN: 1822 case EADDRNOTAVAIL: 1823 break; 1824 /* case EBADF: */ 1825 /* case EACCES: */ 1826 /* case ENOTSOCK: */ 1827 /* case EFAULT: */ 1828 /* case EMSGSIZE: */ 1829 /* case EAGAIN: */ 1830 /* case ENOBUFS: */ 1831 /* case ECONNREFUSED: */ 1832 default: 1833 dprintf("removing entry: errno=%d\n", e); 1834 f->f_type = F_UNUSED; 1835 break; 1836 } 1837 } 1838 break; 1839 1840 case F_FILE: 1841 dprintf(" %s\n", f->fu_fname); 1842 iovlist_append(il, "\n"); 1843 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1844 /* 1845 * If writev(2) fails for potentially transient errors 1846 * like the filesystem being full, ignore it. 1847 * Otherwise remove this logfile from the list. 1848 */ 1849 if (errno != ENOSPC) { 1850 int e = errno; 1851 close_filed(f); 1852 errno = e; 1853 logerror(f->fu_fname); 1854 } 1855 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1856 f->f_flags |= FFLAG_NEEDSYNC; 1857 needdofsync = 1; 1858 } 1859 break; 1860 1861 case F_PIPE: 1862 dprintf(" %s\n", f->fu_pipe_pname); 1863 iovlist_append(il, "\n"); 1864 if (f->fu_pipe_pid == 0) { 1865 if ((f->f_file = p_open(f->fu_pipe_pname, 1866 &f->fu_pipe_pid)) < 0) { 1867 logerror(f->fu_pipe_pname); 1868 break; 1869 } 1870 } 1871 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1872 int e = errno; 1873 1874 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 1875 close_filed(f); 1876 errno = e; 1877 logerror(f->fu_pipe_pname); 1878 } 1879 break; 1880 1881 case F_CONSOLE: 1882 if (flags & IGN_CONS) { 1883 dprintf(" (ignored)\n"); 1884 break; 1885 } 1886 /* FALLTHROUGH */ 1887 1888 case F_TTY: 1889 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1890 iovlist_append(il, "\r\n"); 1891 errno = 0; /* ttymsg() only sometimes returns an errno */ 1892 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { 1893 f->f_type = F_UNUSED; 1894 logerror(msgret); 1895 } 1896 break; 1897 1898 case F_USERS: 1899 case F_WALL: 1900 dprintf("\n"); 1901 iovlist_append(il, "\r\n"); 1902 wallmsg(f, il->iov, il->iovcnt); 1903 break; 1904 } 1905} 1906 1907static void 1908fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1909 const char *procid, const char *msgid, const char *structured_data, 1910 const char *msg, int flags) 1911{ 1912 struct iovlist il; 1913 suseconds_t usec; 1914 int i; 1915 char timebuf[33], priority_number[5]; 1916 1917 iovlist_init(&il); 1918 if (f->f_type == F_WALL) 1919 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 1920 iovlist_append(&il, "<"); 1921 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 1922 iovlist_append(&il, priority_number); 1923 iovlist_append(&il, ">1 "); 1924 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 1925 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 1926 /* Add colon to the time zone offset, which %z doesn't do. */ 1927 timebuf[32] = '\0'; 1928 timebuf[31] = timebuf[30]; 1929 timebuf[30] = timebuf[29]; 1930 timebuf[29] = ':'; 1931 1932 /* Overwrite space for microseconds with actual value. */ 1933 usec = f->f_lasttime.usec; 1934 for (i = 25; i >= 20; --i) { 1935 timebuf[i] = usec % 10 + '0'; 1936 usec /= 10; 1937 } 1938 iovlist_append(&il, timebuf); 1939 } else 1940 iovlist_append(&il, "-"); 1941 iovlist_append(&il, " "); 1942 iovlist_append(&il, hostname); 1943 iovlist_append(&il, " "); 1944 iovlist_append(&il, app_name == NULL ? "-" : app_name); 1945 iovlist_append(&il, " "); 1946 iovlist_append(&il, procid == NULL ? "-" : procid); 1947 iovlist_append(&il, " "); 1948 iovlist_append(&il, msgid == NULL ? "-" : msgid); 1949 iovlist_append(&il, " "); 1950 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 1951 iovlist_append(&il, " "); 1952 iovlist_append(&il, msg); 1953 1954 fprintlog_write(f, &il, flags); 1955} 1956 1957static void 1958fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 1959 const char *procid, const char *msg, int flags) 1960{ 1961 struct iovlist il; 1962 const CODE *c; 1963 int facility, priority; 1964 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 1965 priority_number[5]; 1966 bool facility_found, priority_found; 1967 1968 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 1969 &f->f_lasttime.tm) == 0) 1970 timebuf[0] = '\0'; 1971 1972 iovlist_init(&il); 1973 switch (f->f_type) { 1974 case F_FORW: 1975 /* Message forwarded over the network. */ 1976 iovlist_append(&il, "<"); 1977 snprintf(priority_number, sizeof(priority_number), "%d", 1978 f->f_prevpri); 1979 iovlist_append(&il, priority_number); 1980 iovlist_append(&il, ">"); 1981 iovlist_append(&il, timebuf); 1982 if (strcasecmp(hostname, LocalHostName) != 0) { 1983 iovlist_append(&il, " Forwarded from "); 1984 iovlist_append(&il, hostname); 1985 iovlist_append(&il, ":"); 1986 } 1987 iovlist_append(&il, " "); 1988 break; 1989 1990 case F_WALL: 1991 /* Message written to terminals. */ 1992 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 1993 iovlist_append(&il, hostname); 1994 iovlist_append(&il, " at "); 1995 iovlist_append(&il, timebuf); 1996 iovlist_append(&il, " ...\r\n"); 1997 break; 1998 1999 default: 2000 /* Message written to files. */ 2001 iovlist_append(&il, timebuf); 2002 iovlist_append(&il, " "); 2003 2004 if (LogFacPri) { 2005 iovlist_append(&il, "<"); 2006 2007 facility = f->f_prevpri & LOG_FACMASK; 2008 facility_found = false; 2009 if (LogFacPri > 1) { 2010 for (c = facilitynames; c->c_name; c++) { 2011 if (c->c_val == facility) { 2012 iovlist_append(&il, c->c_name); 2013 facility_found = true; 2014 break; 2015 } 2016 } 2017 } 2018 if (!facility_found) { 2019 snprintf(facility_number, 2020 sizeof(facility_number), "%d", 2021 LOG_FAC(facility)); 2022 iovlist_append(&il, facility_number); 2023 } 2024 2025 iovlist_append(&il, "."); 2026 2027 priority = LOG_PRI(f->f_prevpri); 2028 priority_found = false; 2029 if (LogFacPri > 1) { 2030 for (c = prioritynames; c->c_name; c++) { 2031 if (c->c_val == priority) { 2032 iovlist_append(&il, c->c_name); 2033 priority_found = true; 2034 break; 2035 } 2036 } 2037 } 2038 if (!priority_found) { 2039 snprintf(priority_number, 2040 sizeof(priority_number), "%d", priority); 2041 iovlist_append(&il, priority_number); 2042 } 2043 2044 iovlist_append(&il, "> "); 2045 } 2046 2047 iovlist_append(&il, hostname); 2048 iovlist_append(&il, " "); 2049 break; 2050 } 2051 2052 /* Message body with application name and process ID prefixed. */ 2053 if (app_name != NULL) { 2054 iovlist_append(&il, app_name); 2055 if (procid != NULL) { 2056 iovlist_append(&il, "["); 2057 iovlist_append(&il, procid); 2058 iovlist_append(&il, "]"); 2059 } 2060 iovlist_append(&il, ": "); 2061 } 2062 iovlist_append(&il, msg); 2063 2064 fprintlog_write(f, &il, flags); 2065} 2066 2067static void 2068fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2069 const char *procid, const char *msgid __unused, 2070 const char *structured_data __unused, const char *msg, int flags) 2071{ 2072 2073 dprintf("Logging to %s", TypeNames[f->f_type]); 2074 f->f_time = now; 2075 f->f_prevcount = 0; 2076 if (f->f_type == F_UNUSED) { 2077 dprintf("\n"); 2078 return; 2079 } 2080 2081 if (RFC3164OutputFormat) 2082 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2083 else 2084 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2085 structured_data, msg, flags); 2086} 2087 2088/* 2089 * Prints a message to a log file that the previously logged message was 2090 * received multiple times. 2091 */ 2092static void 2093fprintlog_successive(struct filed *f, int flags) 2094{ 2095 char msg[100]; 2096 2097 assert(f->f_prevcount > 0); 2098 snprintf(msg, sizeof(msg), "last message repeated %d times", 2099 f->f_prevcount); 2100 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2101 flags); 2102} 2103 2104/* 2105 * WALLMSG -- Write a message to the world at large 2106 * 2107 * Write the specified message to either the entire 2108 * world, or a list of approved users. 2109 */ 2110static void 2111wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 2112{ 2113 static int reenter; /* avoid calling ourselves */ 2114 struct utmpx *ut; 2115 int i; 2116 const char *p; 2117 2118 if (reenter++) 2119 return; 2120 setutxent(); 2121 /* NOSTRICT */ 2122 while ((ut = getutxent()) != NULL) { 2123 if (ut->ut_type != USER_PROCESS) 2124 continue; 2125 if (f->f_type == F_WALL) { 2126 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2127 TTYMSGTIME)) != NULL) { 2128 errno = 0; /* already in msg */ 2129 logerror(p); 2130 } 2131 continue; 2132 } 2133 /* should we send the message to this user? */ 2134 for (i = 0; i < MAXUNAMES; i++) { 2135 if (!f->fu_uname[i][0]) 2136 break; 2137 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 2138 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2139 TTYMSGTIME)) != NULL) { 2140 errno = 0; /* already in msg */ 2141 logerror(p); 2142 } 2143 break; 2144 } 2145 } 2146 } 2147 endutxent(); 2148 reenter = 0; 2149} 2150 2151/* 2152 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2153 */ 2154static const char * 2155ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2156{ 2157 static char device[1024]; 2158 static char errbuf[1024]; 2159 struct stat sb; 2160 2161 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2162 2163 if (stat(device, &sb) < 0) { 2164 (void) snprintf(errbuf, sizeof(errbuf), 2165 "%s: %s", device, strerror(errno)); 2166 return (errbuf); 2167 } 2168 if ((sb.st_mode & S_IWGRP) == 0) 2169 /* Messages disabled. */ 2170 return (NULL); 2171 return ttymsg(iov, iovcnt, line, tmout); 2172} 2173 2174static void 2175reapchild(int signo __unused) 2176{ 2177 int status; 2178 pid_t pid; 2179 struct filed *f; 2180 2181 while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) { 2182 /* First, look if it's a process from the dead queue. */ 2183 if (deadq_removebypid(pid)) 2184 continue; 2185 2186 /* Now, look in list of active processes. */ 2187 STAILQ_FOREACH(f, &fhead, next) { 2188 if (f->f_type == F_PIPE && 2189 f->fu_pipe_pid == pid) { 2190 close_filed(f); 2191 log_deadchild(pid, status, f->fu_pipe_pname); 2192 break; 2193 } 2194 } 2195 } 2196 WantReapchild = 0; 2197} 2198 2199/* 2200 * Return a printable representation of a host address. 2201 */ 2202static const char * 2203cvthname(struct sockaddr *f) 2204{ 2205 int error, hl; 2206 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2207 2208 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2209 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 2210 NI_NUMERICHOST); 2211 if (error) { 2212 dprintf("Malformed from address %s\n", gai_strerror(error)); 2213 return ("???"); 2214 } 2215 dprintf("cvthname(%s)\n", ip); 2216 2217 if (!resolve) 2218 return (ip); 2219 2220 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 2221 NULL, 0, NI_NAMEREQD); 2222 if (error) { 2223 dprintf("Host name for your address (%s) unknown\n", ip); 2224 return (ip); 2225 } 2226 hl = strlen(hname); 2227 if (hl > 0 && hname[hl-1] == '.') 2228 hname[--hl] = '\0'; 2229 /* RFC 5424 prefers logging FQDNs. */ 2230 if (RFC3164OutputFormat) 2231 trimdomain(hname, hl); 2232 return (hname); 2233} 2234 2235static void 2236dodie(int signo) 2237{ 2238 2239 WantDie = signo; 2240} 2241 2242static void 2243domark(int signo __unused) 2244{ 2245 2246 MarkSet = 1; 2247} 2248 2249/* 2250 * Print syslogd errors some place. 2251 */ 2252static void 2253logerror(const char *msg) 2254{ 2255 char buf[512]; 2256 static int recursed = 0; 2257 2258 /* If there's an error while trying to log an error, give up. */ 2259 if (recursed) 2260 return; 2261 recursed++; 2262 if (errno != 0) { 2263 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2264 strerror(errno)); 2265 msg = buf; 2266 } 2267 errno = 0; 2268 dprintf("%s\n", buf); 2269 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2270 NULL, msg, 0); 2271 recursed--; 2272} 2273 2274static void 2275die(int signo) 2276{ 2277 struct filed *f; 2278 struct socklist *sl; 2279 char buf[100]; 2280 2281 STAILQ_FOREACH(f, &fhead, next) { 2282 /* flush any pending output */ 2283 if (f->f_prevcount) 2284 fprintlog_successive(f, 0); 2285 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0) 2286 close_filed(f); 2287 } 2288 if (signo) { 2289 dprintf("syslogd: exiting on signal %d\n", signo); 2290 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2291 errno = 0; 2292 logerror(buf); 2293 } 2294 STAILQ_FOREACH(sl, &shead, next) { 2295 if (sl->sl_ss.ss_family == AF_LOCAL) 2296 unlink(sl->sl_peer->pe_name); 2297 } 2298 pidfile_remove(pfh); 2299 2300 exit(1); 2301} 2302 2303static int 2304configfiles(const struct dirent *dp) 2305{ 2306 const char *p; 2307 size_t ext_len; 2308 2309 if (dp->d_name[0] == '.') 2310 return (0); 2311 2312 ext_len = sizeof(include_ext) -1; 2313 2314 if (dp->d_namlen <= ext_len) 2315 return (0); 2316 2317 p = &dp->d_name[dp->d_namlen - ext_len]; 2318 if (strcmp(p, include_ext) != 0) 2319 return (0); 2320 2321 return (1); 2322} 2323 2324static void 2325readconfigfile(FILE *cf, int allow_includes) 2326{ 2327 FILE *cf2; 2328 struct filed *f; 2329 struct dirent **ent; 2330 char cline[LINE_MAX]; 2331 char host[MAXHOSTNAMELEN]; 2332 char prog[LINE_MAX]; 2333 char file[MAXPATHLEN]; 2334 char pfilter[LINE_MAX]; 2335 char *p, *tmp; 2336 int i, nents; 2337 size_t include_len; 2338 2339 /* 2340 * Foreach line in the conf table, open that file. 2341 */ 2342 include_len = sizeof(include_str) -1; 2343 (void)strlcpy(host, "*", sizeof(host)); 2344 (void)strlcpy(prog, "*", sizeof(prog)); 2345 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2346 while (fgets(cline, sizeof(cline), cf) != NULL) { 2347 /* 2348 * check for end-of-section, comments, strip off trailing 2349 * spaces and newline character. #!prog is treated specially: 2350 * following lines apply only to that program. 2351 */ 2352 for (p = cline; isspace(*p); ++p) 2353 continue; 2354 if (*p == 0) 2355 continue; 2356 if (allow_includes && 2357 strncmp(p, include_str, include_len) == 0 && 2358 isspace(p[include_len])) { 2359 p += include_len; 2360 while (isspace(*p)) 2361 p++; 2362 tmp = p; 2363 while (*tmp != '\0' && !isspace(*tmp)) 2364 tmp++; 2365 *tmp = '\0'; 2366 dprintf("Trying to include files in '%s'\n", p); 2367 nents = scandir(p, &ent, configfiles, alphasort); 2368 if (nents == -1) { 2369 dprintf("Unable to open '%s': %s\n", p, 2370 strerror(errno)); 2371 continue; 2372 } 2373 for (i = 0; i < nents; i++) { 2374 if (snprintf(file, sizeof(file), "%s/%s", p, 2375 ent[i]->d_name) >= (int)sizeof(file)) { 2376 dprintf("ignoring path too long: " 2377 "'%s/%s'\n", p, ent[i]->d_name); 2378 free(ent[i]); 2379 continue; 2380 } 2381 free(ent[i]); 2382 cf2 = fopen(file, "r"); 2383 if (cf2 == NULL) 2384 continue; 2385 dprintf("reading %s\n", file); 2386 readconfigfile(cf2, 0); 2387 fclose(cf2); 2388 } 2389 free(ent); 2390 continue; 2391 } 2392 if (*p == '#') { 2393 p++; 2394 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2395 continue; 2396 } 2397 if (*p == '+' || *p == '-') { 2398 host[0] = *p++; 2399 while (isspace(*p)) 2400 p++; 2401 if ((!*p) || (*p == '*')) { 2402 (void)strlcpy(host, "*", sizeof(host)); 2403 continue; 2404 } 2405 if (*p == '@') 2406 p = LocalHostName; 2407 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2408 if (!isalnum(*p) && *p != '.' && *p != '-' 2409 && *p != ',' && *p != ':' && *p != '%') 2410 break; 2411 host[i] = *p++; 2412 } 2413 host[i] = '\0'; 2414 continue; 2415 } 2416 if (*p == '!') { 2417 p++; 2418 while (isspace(*p)) p++; 2419 if ((!*p) || (*p == '*')) { 2420 (void)strlcpy(prog, "*", sizeof(prog)); 2421 continue; 2422 } 2423 for (i = 0; i < LINE_MAX - 1; i++) { 2424 if (!isprint(p[i]) || isspace(p[i])) 2425 break; 2426 prog[i] = p[i]; 2427 } 2428 prog[i] = 0; 2429 continue; 2430 } 2431 if (*p == ':') { 2432 p++; 2433 while (isspace(*p)) 2434 p++; 2435 if ((!*p) || (*p == '*')) { 2436 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2437 continue; 2438 } 2439 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2440 continue; 2441 } 2442 for (p = cline + 1; *p != '\0'; p++) { 2443 if (*p != '#') 2444 continue; 2445 if (*(p - 1) == '\\') { 2446 strcpy(p - 1, p); 2447 p--; 2448 continue; 2449 } 2450 *p = '\0'; 2451 break; 2452 } 2453 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2454 cline[i] = '\0'; 2455 f = cfline(cline, prog, host, pfilter); 2456 if (f != NULL) 2457 addfile(f); 2458 free(f); 2459 } 2460} 2461 2462static void 2463sighandler(int signo) 2464{ 2465 2466 /* Send an wake-up signal to the select() loop. */ 2467 write(sigpipe[1], &signo, sizeof(signo)); 2468} 2469 2470/* 2471 * INIT -- Initialize syslogd from configuration table 2472 */ 2473static void 2474init(int signo) 2475{ 2476 int i; 2477 FILE *cf; 2478 struct filed *f; 2479 char *p; 2480 char oldLocalHostName[MAXHOSTNAMELEN]; 2481 char hostMsg[2*MAXHOSTNAMELEN+40]; 2482 char bootfileMsg[LINE_MAX]; 2483 2484 dprintf("init\n"); 2485 WantInitialize = 0; 2486 2487 /* 2488 * Load hostname (may have changed). 2489 */ 2490 if (signo != 0) 2491 (void)strlcpy(oldLocalHostName, LocalHostName, 2492 sizeof(oldLocalHostName)); 2493 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2494 err(EX_OSERR, "gethostname() failed"); 2495 if ((p = strchr(LocalHostName, '.')) != NULL) { 2496 /* RFC 5424 prefers logging FQDNs. */ 2497 if (RFC3164OutputFormat) 2498 *p = '\0'; 2499 LocalDomain = p + 1; 2500 } else { 2501 LocalDomain = ""; 2502 } 2503 2504 /* 2505 * Load / reload timezone data (in case it changed). 2506 * 2507 * Just calling tzset() again does not work, the timezone code 2508 * caches the result. However, by setting the TZ variable, one 2509 * can defeat the caching and have the timezone code really 2510 * reload the timezone data. Respect any initial setting of 2511 * TZ, in case the system is configured specially. 2512 */ 2513 dprintf("loading timezone data via tzset()\n"); 2514 if (getenv("TZ")) { 2515 tzset(); 2516 } else { 2517 setenv("TZ", ":/etc/localtime", 1); 2518 tzset(); 2519 unsetenv("TZ"); 2520 } 2521 2522 /* 2523 * Close all open log files. 2524 */ 2525 Initialized = 0; 2526 STAILQ_FOREACH(f, &fhead, next) { 2527 /* flush any pending output */ 2528 if (f->f_prevcount) 2529 fprintlog_successive(f, 0); 2530 2531 switch (f->f_type) { 2532 case F_FILE: 2533 case F_FORW: 2534 case F_CONSOLE: 2535 case F_TTY: 2536 close_filed(f); 2537 break; 2538 case F_PIPE: 2539 deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname); 2540 close_filed(f); 2541 break; 2542 } 2543 } 2544 while(!STAILQ_EMPTY(&fhead)) { 2545 f = STAILQ_FIRST(&fhead); 2546 STAILQ_REMOVE_HEAD(&fhead, next); 2547 free(f->f_program); 2548 free(f->f_host); 2549 if (f->f_prop_filter) { 2550 switch (f->f_prop_filter->cmp_type) { 2551 case PROP_CMP_REGEX: 2552 regfree(f->f_prop_filter->pflt_re); 2553 free(f->f_prop_filter->pflt_re); 2554 break; 2555 case PROP_CMP_CONTAINS: 2556 case PROP_CMP_EQUAL: 2557 case PROP_CMP_STARTS: 2558 free(f->f_prop_filter->pflt_strval); 2559 break; 2560 } 2561 free(f->f_prop_filter); 2562 } 2563 free(f); 2564 } 2565 2566 /* open the configuration file */ 2567 if ((cf = fopen(ConfFile, "r")) == NULL) { 2568 dprintf("cannot open %s\n", ConfFile); 2569 f = cfline("*.ERR\t/dev/console", "*", "*", "*"); 2570 if (f != NULL) 2571 addfile(f); 2572 free(f); 2573 f = cfline("*.PANIC\t*", "*", "*", "*"); 2574 if (f != NULL) 2575 addfile(f); 2576 free(f); 2577 Initialized = 1; 2578 2579 return; 2580 } 2581 2582 readconfigfile(cf, 1); 2583 2584 /* close the configuration file */ 2585 (void)fclose(cf); 2586 2587 Initialized = 1; 2588 2589 if (Debug) { 2590 int port; 2591 STAILQ_FOREACH(f, &fhead, next) { 2592 for (i = 0; i <= LOG_NFACILITIES; i++) 2593 if (f->f_pmask[i] == INTERNAL_NOPRI) 2594 printf("X "); 2595 else 2596 printf("%d ", f->f_pmask[i]); 2597 printf("%s: ", TypeNames[f->f_type]); 2598 switch (f->f_type) { 2599 case F_FILE: 2600 printf("%s", f->fu_fname); 2601 break; 2602 2603 case F_CONSOLE: 2604 case F_TTY: 2605 printf("%s%s", _PATH_DEV, f->fu_fname); 2606 break; 2607 2608 case F_FORW: 2609 switch (f->fu_forw_addr->ai_addr->sa_family) { 2610#ifdef INET 2611 case AF_INET: 2612 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2613 break; 2614#endif 2615#ifdef INET6 2616 case AF_INET6: 2617 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2618 break; 2619#endif 2620 default: 2621 port = 0; 2622 } 2623 if (port != 514) { 2624 printf("%s:%d", 2625 f->fu_forw_hname, port); 2626 } else { 2627 printf("%s", f->fu_forw_hname); 2628 } 2629 break; 2630 2631 case F_PIPE: 2632 printf("%s", f->fu_pipe_pname); 2633 break; 2634 2635 case F_USERS: 2636 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2637 printf("%s, ", f->fu_uname[i]); 2638 break; 2639 } 2640 if (f->f_program) 2641 printf(" (%s)", f->f_program); 2642 printf("\n"); 2643 } 2644 } 2645 2646 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2647 NULL, NULL, "restart", 0); 2648 dprintf("syslogd: restarted\n"); 2649 /* 2650 * Log a change in hostname, but only on a restart. 2651 */ 2652 if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) { 2653 (void)snprintf(hostMsg, sizeof(hostMsg), 2654 "hostname changed, \"%s\" to \"%s\"", 2655 oldLocalHostName, LocalHostName); 2656 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2657 NULL, NULL, NULL, hostMsg, 0); 2658 dprintf("%s\n", hostMsg); 2659 } 2660 /* 2661 * Log the kernel boot file if we aren't going to use it as 2662 * the prefix, and if this is *not* a restart. 2663 */ 2664 if (signo == 0 && !use_bootfile) { 2665 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2666 "kernel boot file is %s", bootfile); 2667 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2668 NULL, NULL, NULL, bootfileMsg, 0); 2669 dprintf("%s\n", bootfileMsg); 2670 } 2671} 2672 2673/* 2674 * Compile property-based filter. 2675 * Returns 0 on success, -1 otherwise. 2676 */ 2677static int 2678prop_filter_compile(struct prop_filter *pfilter, char *filter) 2679{ 2680 char *filter_endpos, *p; 2681 char **ap, *argv[2] = {NULL, NULL}; 2682 int re_flags = REG_NOSUB; 2683 int escaped; 2684 2685 bzero(pfilter, sizeof(struct prop_filter)); 2686 2687 /* 2688 * Here's some filter examples mentioned in syslog.conf(5) 2689 * 'msg, contains, ".*Deny.*"' 2690 * 'processname, regex, "^bird6?$"' 2691 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2692 */ 2693 2694 /* 2695 * Split filter into 3 parts: property name (argv[0]), 2696 * cmp type (argv[1]) and lvalue for comparison (filter). 2697 */ 2698 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2699 if (**ap != '\0') 2700 if (++ap >= &argv[2]) 2701 break; 2702 } 2703 2704 if (argv[0] == NULL || argv[1] == NULL) { 2705 logerror("filter parse error"); 2706 return (-1); 2707 } 2708 2709 /* fill in prop_type */ 2710 if (strcasecmp(argv[0], "msg") == 0) 2711 pfilter->prop_type = PROP_TYPE_MSG; 2712 else if(strcasecmp(argv[0], "hostname") == 0) 2713 pfilter->prop_type = PROP_TYPE_HOSTNAME; 2714 else if(strcasecmp(argv[0], "source") == 0) 2715 pfilter->prop_type = PROP_TYPE_HOSTNAME; 2716 else if(strcasecmp(argv[0], "programname") == 0) 2717 pfilter->prop_type = PROP_TYPE_PROGNAME; 2718 else { 2719 logerror("unknown property"); 2720 return (-1); 2721 } 2722 2723 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2724 if (*argv[1] == '!') { 2725 pfilter->cmp_flags |= PROP_FLAG_EXCLUDE; 2726 argv[1]++; 2727 } 2728 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2729 pfilter->cmp_flags |= PROP_FLAG_ICASE; 2730 argv[1] += sizeof("icase_") - 1; 2731 } 2732 2733 /* fill in cmp_type */ 2734 if (strcasecmp(argv[1], "contains") == 0) 2735 pfilter->cmp_type = PROP_CMP_CONTAINS; 2736 else if (strcasecmp(argv[1], "isequal") == 0) 2737 pfilter->cmp_type = PROP_CMP_EQUAL; 2738 else if (strcasecmp(argv[1], "startswith") == 0) 2739 pfilter->cmp_type = PROP_CMP_STARTS; 2740 else if (strcasecmp(argv[1], "regex") == 0) 2741 pfilter->cmp_type = PROP_CMP_REGEX; 2742 else if (strcasecmp(argv[1], "ereregex") == 0) { 2743 pfilter->cmp_type = PROP_CMP_REGEX; 2744 re_flags |= REG_EXTENDED; 2745 } else { 2746 logerror("unknown cmp function"); 2747 return (-1); 2748 } 2749 2750 /* 2751 * Handle filter value 2752 */ 2753 2754 /* ' ".*Deny.*"' */ 2755 /* remove leading whitespace and check for '"' next character */ 2756 filter += strspn(filter, ", \t\n"); 2757 if (*filter != '"' || strlen(filter) < 3) { 2758 logerror("property value parse error"); 2759 return (-1); 2760 } 2761 filter++; 2762 2763 /* '.*Deny.*"' */ 2764 /* process possible backslash (\") escaping */ 2765 escaped = 0; 2766 filter_endpos = filter; 2767 for (p = filter; *p != '\0'; p++) { 2768 if (*p == '\\' && !escaped) { 2769 escaped = 1; 2770 /* do not shift filter_endpos */ 2771 continue; 2772 } 2773 if (*p == '"' && !escaped) { 2774 p++; 2775 break; 2776 } 2777 /* we've seen some esc symbols, need to compress the line */ 2778 if (filter_endpos != p) 2779 *filter_endpos = *p; 2780 2781 filter_endpos++; 2782 escaped = 0; 2783 } 2784 2785 *filter_endpos = '\0'; 2786 /* '.*Deny.*' */ 2787 2788 /* We should not have anything but whitespace left after closing '"' */ 2789 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2790 logerror("property value parse error"); 2791 return (-1); 2792 } 2793 2794 if (pfilter->cmp_type == PROP_CMP_REGEX) { 2795 pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re)); 2796 if (pfilter->pflt_re == NULL) { 2797 logerror("RE calloc() error"); 2798 free(pfilter->pflt_re); 2799 return (-1); 2800 } 2801 if (pfilter->cmp_flags & PROP_FLAG_ICASE) 2802 re_flags |= REG_ICASE; 2803 if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) { 2804 logerror("RE compilation error"); 2805 free(pfilter->pflt_re); 2806 return (-1); 2807 } 2808 } else { 2809 pfilter->pflt_strval = strdup(filter); 2810 pfilter->pflt_strlen = strlen(filter); 2811 } 2812 2813 return (0); 2814 2815} 2816 2817/* 2818 * Crack a configuration file line 2819 */ 2820static struct filed * 2821cfline(const char *line, const char *prog, const char *host, 2822 const char *pfilter) 2823{ 2824 struct filed *f; 2825 struct addrinfo hints, *res; 2826 int error, i, pri, syncfile; 2827 const char *p, *q; 2828 char *bp, *pfilter_dup; 2829 char buf[MAXLINE], ebuf[100]; 2830 2831 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 2832 host, pfilter); 2833 2834 f = calloc(1, sizeof(*f)); 2835 if (f == NULL) { 2836 logerror("malloc"); 2837 exit(1); 2838 } 2839 errno = 0; /* keep strerror() stuff out of logerror messages */ 2840 2841 for (i = 0; i <= LOG_NFACILITIES; i++) 2842 f->f_pmask[i] = INTERNAL_NOPRI; 2843 2844 /* save hostname if any */ 2845 if (host && *host == '*') 2846 host = NULL; 2847 if (host) { 2848 int hl; 2849 2850 f->f_host = strdup(host); 2851 if (f->f_host == NULL) { 2852 logerror("strdup"); 2853 exit(1); 2854 } 2855 hl = strlen(f->f_host); 2856 if (hl > 0 && f->f_host[hl-1] == '.') 2857 f->f_host[--hl] = '\0'; 2858 /* RFC 5424 prefers logging FQDNs. */ 2859 if (RFC3164OutputFormat) 2860 trimdomain(f->f_host, hl); 2861 } 2862 2863 /* save program name if any */ 2864 if (prog && *prog == '*') 2865 prog = NULL; 2866 if (prog) { 2867 f->f_program = strdup(prog); 2868 if (f->f_program == NULL) { 2869 logerror("strdup"); 2870 exit(1); 2871 } 2872 } 2873 2874 if (pfilter) { 2875 f->f_prop_filter = calloc(1, sizeof(*(f->f_prop_filter))); 2876 if (f->f_prop_filter == NULL) { 2877 logerror("pfilter calloc"); 2878 exit(1); 2879 } 2880 if (*pfilter == '*') 2881 f->f_prop_filter->prop_type = PROP_TYPE_NOOP; 2882 else { 2883 pfilter_dup = strdup(pfilter); 2884 if (pfilter_dup == NULL) { 2885 logerror("strdup"); 2886 exit(1); 2887 } 2888 if (prop_filter_compile(f->f_prop_filter, pfilter_dup)) { 2889 logerror("filter compile error"); 2890 exit(1); 2891 } 2892 } 2893 } 2894 2895 /* scan through the list of selectors */ 2896 for (p = line; *p && *p != '\t' && *p != ' ';) { 2897 int pri_done; 2898 int pri_cmp; 2899 int pri_invert; 2900 2901 /* find the end of this facility name list */ 2902 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; ) 2903 continue; 2904 2905 /* get the priority comparison */ 2906 pri_cmp = 0; 2907 pri_done = 0; 2908 pri_invert = 0; 2909 if (*q == '!') { 2910 pri_invert = 1; 2911 q++; 2912 } 2913 while (!pri_done) { 2914 switch (*q) { 2915 case '<': 2916 pri_cmp |= PRI_LT; 2917 q++; 2918 break; 2919 case '=': 2920 pri_cmp |= PRI_EQ; 2921 q++; 2922 break; 2923 case '>': 2924 pri_cmp |= PRI_GT; 2925 q++; 2926 break; 2927 default: 2928 pri_done++; 2929 break; 2930 } 2931 } 2932 2933 /* collect priority name */ 2934 for (bp = buf; *q && !strchr("\t,; ", *q); ) 2935 *bp++ = *q++; 2936 *bp = '\0'; 2937 2938 /* skip cruft */ 2939 while (strchr(",;", *q)) 2940 q++; 2941 2942 /* decode priority name */ 2943 if (*buf == '*') { 2944 pri = LOG_PRIMASK; 2945 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2946 } else { 2947 /* Ignore trailing spaces. */ 2948 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2949 buf[i] = '\0'; 2950 2951 pri = decode(buf, prioritynames); 2952 if (pri < 0) { 2953 errno = 0; 2954 (void)snprintf(ebuf, sizeof ebuf, 2955 "unknown priority name \"%s\"", buf); 2956 logerror(ebuf); 2957 free(f); 2958 return (NULL); 2959 } 2960 } 2961 if (!pri_cmp) 2962 pri_cmp = (UniquePriority) 2963 ? (PRI_EQ) 2964 : (PRI_EQ | PRI_GT) 2965 ; 2966 if (pri_invert) 2967 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2968 2969 /* scan facilities */ 2970 while (*p && !strchr("\t.; ", *p)) { 2971 for (bp = buf; *p && !strchr("\t,;. ", *p); ) 2972 *bp++ = *p++; 2973 *bp = '\0'; 2974 2975 if (*buf == '*') { 2976 for (i = 0; i < LOG_NFACILITIES; i++) { 2977 f->f_pmask[i] = pri; 2978 f->f_pcmp[i] = pri_cmp; 2979 } 2980 } else { 2981 i = decode(buf, facilitynames); 2982 if (i < 0) { 2983 errno = 0; 2984 (void)snprintf(ebuf, sizeof ebuf, 2985 "unknown facility name \"%s\"", 2986 buf); 2987 logerror(ebuf); 2988 free(f); 2989 return (NULL); 2990 } 2991 f->f_pmask[i >> 3] = pri; 2992 f->f_pcmp[i >> 3] = pri_cmp; 2993 } 2994 while (*p == ',' || *p == ' ') 2995 p++; 2996 } 2997 2998 p = q; 2999 } 3000 3001 /* skip to action part */ 3002 while (*p == '\t' || *p == ' ') 3003 p++; 3004 3005 if (*p == '-') { 3006 syncfile = 0; 3007 p++; 3008 } else 3009 syncfile = 1; 3010 3011 switch (*p) { 3012 case '@': 3013 { 3014 char *tp; 3015 char endkey = ':'; 3016 /* 3017 * scan forward to see if there is a port defined. 3018 * so we can't use strlcpy.. 3019 */ 3020 i = sizeof(f->fu_forw_hname); 3021 tp = f->fu_forw_hname; 3022 p++; 3023 3024 /* 3025 * an ipv6 address should start with a '[' in that case 3026 * we should scan for a ']' 3027 */ 3028 if (*p == '[') { 3029 p++; 3030 endkey = ']'; 3031 } 3032 while (*p && (*p != endkey) && (i-- > 0)) { 3033 *tp++ = *p++; 3034 } 3035 if (endkey == ']' && *p == endkey) 3036 p++; 3037 *tp = '\0'; 3038 } 3039 /* See if we copied a domain and have a port */ 3040 if (*p == ':') 3041 p++; 3042 else 3043 p = NULL; 3044 3045 hints = (struct addrinfo){ 3046 .ai_family = family, 3047 .ai_socktype = SOCK_DGRAM 3048 }; 3049 error = getaddrinfo(f->fu_forw_hname, 3050 p ? p : "syslog", &hints, &res); 3051 if (error) { 3052 logerror(gai_strerror(error)); 3053 break; 3054 } 3055 f->fu_forw_addr = res; 3056 f->f_type = F_FORW; 3057 break; 3058 3059 case '/': 3060 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3061 f->f_type = F_UNUSED; 3062 logerror(p); 3063 break; 3064 } 3065 if (syncfile) 3066 f->f_flags |= FFLAG_SYNC; 3067 if (isatty(f->f_file)) { 3068 if (strcmp(p, ctty) == 0) 3069 f->f_type = F_CONSOLE; 3070 else 3071 f->f_type = F_TTY; 3072 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 3073 sizeof(f->fu_fname)); 3074 } else { 3075 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 3076 f->f_type = F_FILE; 3077 } 3078 break; 3079 3080 case '|': 3081 f->fu_pipe_pid = 0; 3082 (void)strlcpy(f->fu_pipe_pname, p + 1, 3083 sizeof(f->fu_pipe_pname)); 3084 f->f_type = F_PIPE; 3085 break; 3086 3087 case '*': 3088 f->f_type = F_WALL; 3089 break; 3090 3091 default: 3092 for (i = 0; i < MAXUNAMES && *p; i++) { 3093 for (q = p; *q && *q != ','; ) 3094 q++; 3095 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 3096 if ((q - p) >= MAXLOGNAME) 3097 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 3098 else 3099 f->fu_uname[i][q - p] = '\0'; 3100 while (*q == ',' || *q == ' ') 3101 q++; 3102 p = q; 3103 } 3104 f->f_type = F_USERS; 3105 break; 3106 } 3107 return (f); 3108} 3109 3110 3111/* 3112 * Decode a symbolic name to a numeric value 3113 */ 3114static int 3115decode(const char *name, const CODE *codetab) 3116{ 3117 const CODE *c; 3118 char *p, buf[40]; 3119 3120 if (isdigit(*name)) 3121 return (atoi(name)); 3122 3123 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3124 if (isupper(*name)) 3125 *p = tolower(*name); 3126 else 3127 *p = *name; 3128 } 3129 *p = '\0'; 3130 for (c = codetab; c->c_name; c++) 3131 if (!strcmp(buf, c->c_name)) 3132 return (c->c_val); 3133 3134 return (-1); 3135} 3136 3137static void 3138markit(void) 3139{ 3140 struct filed *f; 3141 struct deadq_entry *dq, *dq0; 3142 3143 now = time((time_t *)NULL); 3144 MarkSeq += TIMERINTVL; 3145 if (MarkSeq >= MarkInterval) { 3146 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3147 "-- MARK --", MARK); 3148 MarkSeq = 0; 3149 } 3150 3151 STAILQ_FOREACH(f, &fhead, next) { 3152 if (f->f_prevcount && now >= REPEATTIME(f)) { 3153 dprintf("flush %s: repeated %d times, %d sec.\n", 3154 TypeNames[f->f_type], f->f_prevcount, 3155 repeatinterval[f->f_repeatcount]); 3156 fprintlog_successive(f, 0); 3157 BACKOFF(f); 3158 } 3159 } 3160 3161 /* Walk the dead queue, and see if we should signal somebody. */ 3162 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3163 switch (dq->dq_timeout) { 3164 case 0: 3165 /* Already signalled once, try harder now. */ 3166 if (kill(dq->dq_pid, SIGKILL) != 0) 3167 (void)deadq_remove(dq); 3168 break; 3169 3170 case 1: 3171 /* 3172 * Timed out on dead queue, send terminate 3173 * signal. Note that we leave the removal 3174 * from the dead queue to reapchild(), which 3175 * will also log the event (unless the process 3176 * didn't even really exist, in case we simply 3177 * drop it from the dead queue). 3178 */ 3179 if (kill(dq->dq_pid, SIGTERM) != 0) 3180 (void)deadq_remove(dq); 3181 else 3182 dq->dq_timeout--; 3183 break; 3184 default: 3185 dq->dq_timeout--; 3186 } 3187 } 3188 MarkSet = 0; 3189 (void)alarm(TIMERINTVL); 3190} 3191 3192/* 3193 * fork off and become a daemon, but wait for the child to come online 3194 * before returning to the parent, or we get disk thrashing at boot etc. 3195 * Set a timer so we don't hang forever if it wedges. 3196 */ 3197static int 3198waitdaemon(int maxwait) 3199{ 3200 int fd; 3201 int status; 3202 pid_t pid, childpid; 3203 3204 switch (childpid = fork()) { 3205 case -1: 3206 return (-1); 3207 case 0: 3208 break; 3209 default: 3210 signal(SIGALRM, timedout); 3211 alarm(maxwait); 3212 while ((pid = wait3(&status, 0, NULL)) != -1) { 3213 if (WIFEXITED(status)) 3214 errx(1, "child pid %d exited with return code %d", 3215 pid, WEXITSTATUS(status)); 3216 if (WIFSIGNALED(status)) 3217 errx(1, "child pid %d exited on signal %d%s", 3218 pid, WTERMSIG(status), 3219 WCOREDUMP(status) ? " (core dumped)" : 3220 ""); 3221 if (pid == childpid) /* it's gone... */ 3222 break; 3223 } 3224 exit(0); 3225 } 3226 3227 if (setsid() == -1) 3228 return (-1); 3229 3230 (void)chdir("/"); 3231 if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) { 3232 (void)dup2(fd, STDIN_FILENO); 3233 (void)dup2(fd, STDOUT_FILENO); 3234 (void)dup2(fd, STDERR_FILENO); 3235 if (fd > STDERR_FILENO) 3236 (void)close(fd); 3237 } 3238 return (getppid()); 3239} 3240 3241/* 3242 * We get a SIGALRM from the child when it's running and finished doing it's 3243 * fsync()'s or O_SYNC writes for all the boot messages. 3244 * 3245 * We also get a signal from the kernel if the timer expires, so check to 3246 * see what happened. 3247 */ 3248static void 3249timedout(int sig __unused) 3250{ 3251 int left; 3252 left = alarm(0); 3253 signal(SIGALRM, SIG_DFL); 3254 if (left == 0) 3255 errx(1, "timed out waiting for child"); 3256 else 3257 _exit(0); 3258} 3259 3260/* 3261 * Add `s' to the list of allowable peer addresses to accept messages 3262 * from. 3263 * 3264 * `s' is a string in the form: 3265 * 3266 * [*]domainname[:{servicename|portnumber|*}] 3267 * 3268 * or 3269 * 3270 * netaddr/maskbits[:{servicename|portnumber|*}] 3271 * 3272 * Returns -1 on error, 0 if the argument was valid. 3273 */ 3274static int 3275#if defined(INET) || defined(INET6) 3276allowaddr(char *s) 3277#else 3278allowaddr(char *s __unused) 3279#endif 3280{ 3281#if defined(INET) || defined(INET6) 3282 char *cp1, *cp2; 3283 struct allowedpeer *ap; 3284 struct servent *se; 3285 int masklen = -1; 3286 struct addrinfo hints, *res = NULL; 3287#ifdef INET 3288 in_addr_t *addrp, *maskp; 3289#endif 3290#ifdef INET6 3291 uint32_t *addr6p, *mask6p; 3292#endif 3293 char ip[NI_MAXHOST]; 3294 3295 ap = calloc(1, sizeof(*ap)); 3296 if (ap == NULL) 3297 err(1, "malloc failed"); 3298 3299#ifdef INET6 3300 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3301#endif 3302 cp1 = s; 3303 if ((cp1 = strrchr(cp1, ':'))) { 3304 /* service/port provided */ 3305 *cp1++ = '\0'; 3306 if (strlen(cp1) == 1 && *cp1 == '*') 3307 /* any port allowed */ 3308 ap->port = 0; 3309 else if ((se = getservbyname(cp1, "udp"))) { 3310 ap->port = ntohs(se->s_port); 3311 } else { 3312 ap->port = strtol(cp1, &cp2, 0); 3313 /* port not numeric */ 3314 if (*cp2 != '\0') 3315 goto err; 3316 } 3317 } else { 3318 if ((se = getservbyname("syslog", "udp"))) 3319 ap->port = ntohs(se->s_port); 3320 else 3321 /* sanity, should not happen */ 3322 ap->port = 514; 3323 } 3324 3325 if ((cp1 = strchr(s, '/')) != NULL && 3326 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3327 *cp1 = '\0'; 3328 if ((masklen = atoi(cp1 + 1)) < 0) 3329 goto err; 3330 } 3331#ifdef INET6 3332 if (*s == '[') { 3333 cp2 = s + strlen(s) - 1; 3334 if (*cp2 == ']') { 3335 ++s; 3336 *cp2 = '\0'; 3337 } else { 3338 cp2 = NULL; 3339 } 3340 } else { 3341 cp2 = NULL; 3342 } 3343#endif 3344 hints = (struct addrinfo){ 3345 .ai_family = PF_UNSPEC, 3346 .ai_socktype = SOCK_DGRAM, 3347 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3348 }; 3349 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3350 ap->isnumeric = 1; 3351 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3352 ap->a_mask = (struct sockaddr_storage){ 3353 .ss_family = res->ai_family, 3354 .ss_len = res->ai_addrlen 3355 }; 3356 switch (res->ai_family) { 3357#ifdef INET 3358 case AF_INET: 3359 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3360 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3361 if (masklen < 0) { 3362 /* use default netmask */ 3363 if (IN_CLASSA(ntohl(*addrp))) 3364 *maskp = htonl(IN_CLASSA_NET); 3365 else if (IN_CLASSB(ntohl(*addrp))) 3366 *maskp = htonl(IN_CLASSB_NET); 3367 else 3368 *maskp = htonl(IN_CLASSC_NET); 3369 } else if (masklen == 0) { 3370 *maskp = 0; 3371 } else if (masklen <= 32) { 3372 /* convert masklen to netmask */ 3373 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3374 } else { 3375 goto err; 3376 } 3377 /* Lose any host bits in the network number. */ 3378 *addrp &= *maskp; 3379 break; 3380#endif 3381#ifdef INET6 3382 case AF_INET6: 3383 if (masklen > 128) 3384 goto err; 3385 3386 if (masklen < 0) 3387 masklen = 128; 3388 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3389 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3390 /* convert masklen to netmask */ 3391 while (masklen > 0) { 3392 if (masklen < 32) { 3393 *mask6p = 3394 htonl(~(0xffffffff >> masklen)); 3395 *addr6p &= *mask6p; 3396 break; 3397 } else { 3398 *mask6p++ = 0xffffffff; 3399 addr6p++; 3400 masklen -= 32; 3401 } 3402 } 3403 break; 3404#endif 3405 default: 3406 goto err; 3407 } 3408 freeaddrinfo(res); 3409 } else { 3410 /* arg `s' is domain name */ 3411 ap->isnumeric = 0; 3412 ap->a_name = s; 3413 if (cp1) 3414 *cp1 = '/'; 3415#ifdef INET6 3416 if (cp2) { 3417 *cp2 = ']'; 3418 --s; 3419 } 3420#endif 3421 } 3422 STAILQ_INSERT_TAIL(&aphead, ap, next); 3423 3424 if (Debug) { 3425 printf("allowaddr: rule "); 3426 if (ap->isnumeric) { 3427 printf("numeric, "); 3428 getnameinfo(sstosa(&ap->a_addr), 3429 (sstosa(&ap->a_addr))->sa_len, 3430 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3431 printf("addr = %s, ", ip); 3432 getnameinfo(sstosa(&ap->a_mask), 3433 (sstosa(&ap->a_mask))->sa_len, 3434 ip, sizeof ip, NULL, 0, NI_NUMERICHOST); 3435 printf("mask = %s; ", ip); 3436 } else { 3437 printf("domainname = %s; ", ap->a_name); 3438 } 3439 printf("port = %d\n", ap->port); 3440 } 3441 3442 return (0); 3443err: 3444 if (res != NULL) 3445 freeaddrinfo(res); 3446 free(ap); 3447#endif 3448 return (-1); 3449} 3450 3451/* 3452 * Validate that the remote peer has permission to log to us. 3453 */ 3454static int 3455validate(struct sockaddr *sa, const char *hname) 3456{ 3457 int i; 3458 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3459 struct allowedpeer *ap; 3460#ifdef INET 3461 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3462#endif 3463#ifdef INET6 3464 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3465#endif 3466 struct addrinfo hints, *res; 3467 u_short sport; 3468 int num = 0; 3469 3470 STAILQ_FOREACH(ap, &aphead, next) { 3471 num++; 3472 } 3473 dprintf("# of validation rule: %d\n", num); 3474 if (num == 0) 3475 /* traditional behaviour, allow everything */ 3476 return (1); 3477 3478 (void)strlcpy(name, hname, sizeof(name)); 3479 hints = (struct addrinfo){ 3480 .ai_family = PF_UNSPEC, 3481 .ai_socktype = SOCK_DGRAM, 3482 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3483 }; 3484 if (getaddrinfo(name, NULL, &hints, &res) == 0) 3485 freeaddrinfo(res); 3486 else if (strchr(name, '.') == NULL) { 3487 strlcat(name, ".", sizeof name); 3488 strlcat(name, LocalDomain, sizeof name); 3489 } 3490 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 3491 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3492 return (0); /* for safety, should not occur */ 3493 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3494 ip, port, name); 3495 sport = atoi(port); 3496 3497 /* now, walk down the list */ 3498 i = 0; 3499 STAILQ_FOREACH(ap, &aphead, next) { 3500 i++; 3501 if (ap->port != 0 && ap->port != sport) { 3502 dprintf("rejected in rule %d due to port mismatch.\n", 3503 i); 3504 continue; 3505 } 3506 3507 if (ap->isnumeric) { 3508 if (ap->a_addr.ss_family != sa->sa_family) { 3509 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3510 continue; 3511 } 3512#ifdef INET 3513 else if (ap->a_addr.ss_family == AF_INET) { 3514 sin4 = satosin(sa); 3515 a4p = satosin(&ap->a_addr); 3516 m4p = satosin(&ap->a_mask); 3517 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3518 != a4p->sin_addr.s_addr) { 3519 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3520 continue; 3521 } 3522 } 3523#endif 3524#ifdef INET6 3525 else if (ap->a_addr.ss_family == AF_INET6) { 3526 sin6 = satosin6(sa); 3527 a6p = satosin6(&ap->a_addr); 3528 m6p = satosin6(&ap->a_mask); 3529 if (a6p->sin6_scope_id != 0 && 3530 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3531 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3532 continue; 3533 } 3534 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3535 &a6p->sin6_addr, &m6p->sin6_addr)) { 3536 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3537 continue; 3538 } 3539 } 3540#endif 3541 else 3542 continue; 3543 } else { 3544 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3545 FNM_NOMATCH) { 3546 dprintf("rejected in rule %d due to name " 3547 "mismatch.\n", i); 3548 continue; 3549 } 3550 } 3551 dprintf("accepted in rule %d.\n", i); 3552 return (1); /* hooray! */ 3553 } 3554 return (0); 3555} 3556 3557/* 3558 * Fairly similar to popen(3), but returns an open descriptor, as 3559 * opposed to a FILE *. 3560 */ 3561static int 3562p_open(const char *prog, pid_t *rpid) 3563{ 3564 int pfd[2], nulldesc; 3565 pid_t pid; 3566 char *argv[4]; /* sh -c cmd NULL */ 3567 char errmsg[200]; 3568 3569 if (pipe(pfd) == -1) 3570 return (-1); 3571 if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1) 3572 /* we are royally screwed anyway */ 3573 return (-1); 3574 3575 switch ((pid = fork())) { 3576 case -1: 3577 close(nulldesc); 3578 return (-1); 3579 3580 case 0: 3581 (void)setsid(); /* Avoid catching SIGHUPs. */ 3582 argv[0] = strdup("sh"); 3583 argv[1] = strdup("-c"); 3584 argv[2] = strdup(prog); 3585 argv[3] = NULL; 3586 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 3587 logerror("strdup"); 3588 exit(1); 3589 } 3590 3591 alarm(0); 3592 3593 /* Restore signals marked as SIG_IGN. */ 3594 (void)signal(SIGINT, SIG_DFL); 3595 (void)signal(SIGQUIT, SIG_DFL); 3596 (void)signal(SIGPIPE, SIG_DFL); 3597 3598 dup2(pfd[0], STDIN_FILENO); 3599 dup2(nulldesc, STDOUT_FILENO); 3600 dup2(nulldesc, STDERR_FILENO); 3601 closefrom(STDERR_FILENO + 1); 3602 3603 (void)execvp(_PATH_BSHELL, argv); 3604 _exit(255); 3605 } 3606 close(nulldesc); 3607 close(pfd[0]); 3608 /* 3609 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3610 * supposed to get an EWOULDBLOCK on writev(2), which is 3611 * caught by the logic above anyway, which will in turn close 3612 * the pipe, and fork a new logging subprocess if necessary. 3613 * The stale subprocess will be killed some time later unless 3614 * it terminated itself due to closing its input pipe (so we 3615 * get rid of really dead puppies). 3616 */ 3617 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3618 /* This is bad. */ 3619 (void)snprintf(errmsg, sizeof errmsg, 3620 "Warning: cannot change pipe to PID %d to " 3621 "non-blocking behaviour.", 3622 (int)pid); 3623 logerror(errmsg); 3624 } 3625 *rpid = pid; 3626 return (pfd[1]); 3627} 3628 3629static void 3630deadq_enter(pid_t pid, const char *name) 3631{ 3632 struct deadq_entry *dq; 3633 int status; 3634 3635 if (pid == 0) 3636 return; 3637 /* 3638 * Be paranoid, if we can't signal the process, don't enter it 3639 * into the dead queue (perhaps it's already dead). If possible, 3640 * we try to fetch and log the child's status. 3641 */ 3642 if (kill(pid, 0) != 0) { 3643 if (waitpid(pid, &status, WNOHANG) > 0) 3644 log_deadchild(pid, status, name); 3645 return; 3646 } 3647 3648 dq = malloc(sizeof(*dq)); 3649 if (dq == NULL) { 3650 logerror("malloc"); 3651 exit(1); 3652 } 3653 *dq = (struct deadq_entry){ 3654 .dq_pid = pid, 3655 .dq_timeout = DQ_TIMO_INIT 3656 }; 3657 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3658} 3659 3660static int 3661deadq_remove(struct deadq_entry *dq) 3662{ 3663 if (dq != NULL) { 3664 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3665 free(dq); 3666 return (1); 3667 } 3668 3669 return (0); 3670} 3671 3672static int 3673deadq_removebypid(pid_t pid) 3674{ 3675 struct deadq_entry *dq; 3676 3677 TAILQ_FOREACH(dq, &deadq_head, dq_entries) { 3678 if (dq->dq_pid == pid) 3679 break; 3680 } 3681 return (deadq_remove(dq)); 3682} 3683 3684static void 3685log_deadchild(pid_t pid, int status, const char *name) 3686{ 3687 int code; 3688 char buf[256]; 3689 const char *reason; 3690 3691 errno = 0; /* Keep strerror() stuff out of logerror messages. */ 3692 if (WIFSIGNALED(status)) { 3693 reason = "due to signal"; 3694 code = WTERMSIG(status); 3695 } else { 3696 reason = "with status"; 3697 code = WEXITSTATUS(status); 3698 if (code == 0) 3699 return; 3700 } 3701 (void)snprintf(buf, sizeof buf, 3702 "Logging subprocess %d (%s) exited %s %d.", 3703 pid, name, reason, code); 3704 logerror(buf); 3705} 3706 3707static int 3708socksetup(struct peer *pe) 3709{ 3710 struct addrinfo hints, *res, *res0; 3711 int error; 3712 char *cp; 3713 int (*sl_recv)(struct socklist *); 3714 /* 3715 * We have to handle this case for backwards compatibility: 3716 * If there are two (or more) colons but no '[' and ']', 3717 * assume this is an inet6 address without a service. 3718 */ 3719 if (pe->pe_name != NULL) { 3720#ifdef INET6 3721 if (pe->pe_name[0] == '[' && 3722 (cp = strchr(pe->pe_name + 1, ']')) != NULL) { 3723 pe->pe_name = &pe->pe_name[1]; 3724 *cp = '\0'; 3725 if (cp[1] == ':' && cp[2] != '\0') 3726 pe->pe_serv = cp + 2; 3727 } else { 3728#endif 3729 cp = strchr(pe->pe_name, ':'); 3730 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 3731 *cp = '\0'; 3732 if (cp[1] != '\0') 3733 pe->pe_serv = cp + 1; 3734 if (cp == pe->pe_name) 3735 pe->pe_name = NULL; 3736 } 3737#ifdef INET6 3738 } 3739#endif 3740 } 3741 hints = (struct addrinfo){ 3742 .ai_family = AF_UNSPEC, 3743 .ai_socktype = SOCK_DGRAM, 3744 .ai_flags = AI_PASSIVE 3745 }; 3746 if (pe->pe_name != NULL) 3747 dprintf("Trying peer: %s\n", pe->pe_name); 3748 if (pe->pe_serv == NULL) 3749 pe->pe_serv = "syslog"; 3750 error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0); 3751 if (error) { 3752 char *msgbuf; 3753 3754 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 3755 pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv, 3756 gai_strerror(error)); 3757 errno = 0; 3758 if (msgbuf == NULL) 3759 logerror(gai_strerror(error)); 3760 else 3761 logerror(msgbuf); 3762 free(msgbuf); 3763 die(0); 3764 } 3765 for (res = res0; res != NULL; res = res->ai_next) { 3766 int s; 3767 3768 if (res->ai_family != AF_LOCAL && 3769 SecureMode > 1) { 3770 /* Only AF_LOCAL in secure mode. */ 3771 continue; 3772 } 3773 if (family != AF_UNSPEC && 3774 res->ai_family != AF_LOCAL && res->ai_family != family) 3775 continue; 3776 3777 s = socket(res->ai_family, res->ai_socktype, 3778 res->ai_protocol); 3779 if (s < 0) { 3780 logerror("socket"); 3781 error++; 3782 continue; 3783 } 3784#ifdef INET6 3785 if (res->ai_family == AF_INET6) { 3786 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, 3787 &(int){1}, sizeof(int)) < 0) { 3788 logerror("setsockopt(IPV6_V6ONLY)"); 3789 close(s); 3790 error++; 3791 continue; 3792 } 3793 } 3794#endif 3795 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 3796 &(int){1}, sizeof(int)) < 0) { 3797 logerror("setsockopt(SO_REUSEADDR)"); 3798 close(s); 3799 error++; 3800 continue; 3801 } 3802 3803 /* 3804 * Bind INET and UNIX-domain sockets. 3805 * 3806 * A UNIX-domain socket is always bound to a pathname 3807 * regardless of -N flag. 3808 * 3809 * For INET sockets, RFC 3164 recommends that client 3810 * side message should come from the privileged syslogd port. 3811 * 3812 * If the system administrator chooses not to obey 3813 * this, we can skip the bind() step so that the 3814 * system will choose a port for us. 3815 */ 3816 if (res->ai_family == AF_LOCAL) 3817 unlink(pe->pe_name); 3818 if (res->ai_family == AF_LOCAL || 3819 NoBind == 0 || pe->pe_name != NULL) { 3820 if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { 3821 logerror("bind"); 3822 close(s); 3823 error++; 3824 continue; 3825 } 3826 if (res->ai_family == AF_LOCAL || 3827 SecureMode == 0) 3828 increase_rcvbuf(s); 3829 } 3830 if (res->ai_family == AF_LOCAL && 3831 chmod(pe->pe_name, pe->pe_mode) < 0) { 3832 dprintf("chmod %s: %s\n", pe->pe_name, 3833 strerror(errno)); 3834 close(s); 3835 error++; 3836 continue; 3837 } 3838 dprintf("new socket fd is %d\n", s); 3839 if (res->ai_socktype != SOCK_DGRAM) { 3840 listen(s, 5); 3841 } 3842 sl_recv = socklist_recv_sock; 3843#if defined(INET) || defined(INET6) 3844 if (SecureMode && (res->ai_family == AF_INET || 3845 res->ai_family == AF_INET6)) { 3846 dprintf("shutdown\n"); 3847 /* Forbid communication in secure mode. */ 3848 if (shutdown(s, SHUT_RD) < 0 && 3849 errno != ENOTCONN) { 3850 logerror("shutdown"); 3851 if (!Debug) 3852 die(0); 3853 } 3854 sl_recv = NULL; 3855 } else 3856#endif 3857 dprintf("listening on socket\n"); 3858 dprintf("sending on socket\n"); 3859 addsock(res->ai_addr, res->ai_addrlen, 3860 &(struct socklist){ 3861 .sl_socket = s, 3862 .sl_peer = pe, 3863 .sl_recv = sl_recv 3864 }); 3865 } 3866 freeaddrinfo(res0); 3867 3868 return(error); 3869} 3870 3871static void 3872increase_rcvbuf(int fd) 3873{ 3874 socklen_t len; 3875 3876 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3877 &(socklen_t){sizeof(len)}) == 0) { 3878 if (len < RCVBUF_MINSIZE) { 3879 len = RCVBUF_MINSIZE; 3880 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3881 } 3882 } 3883} 3884