1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31/*- 32 * SPDX-License-Identifier: BSD-2-Clause 33 * 34 * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/ 35 * Author: Ed Schouten <ed@FreeBSD.org> 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 46 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 47 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 48 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 49 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 50 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 51 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 52 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 53 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 54 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 55 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 56 * SUCH DAMAGE. 57 */ 58 59/* 60 * syslogd -- log system messages 61 * 62 * This program implements a system log. It takes a series of lines. 63 * Each line may have a priority, signified as "<n>" as 64 * the first characters of the line. If this is 65 * not present, a default priority is used. 66 * 67 * To kill syslogd, send a signal 15 (terminate). A signal 1 (hup) will 68 * cause it to reread its configuration file. 69 * 70 * Defined Constants: 71 * 72 * MAXLINE -- the maximum line length that can be handled. 73 * DEFUPRI -- the default priority for user messages 74 * DEFSPRI -- the default priority for kernel messages 75 * 76 * Author: Eric Allman 77 * extensive changes by Ralph Campbell 78 * more extensive changes by Eric Allman (again) 79 * Extension to log by program name as well as facility and priority 80 * by Peter da Silva. 81 * -u and -v by Harlan Stenn. 82 * Priority comparison code by Harlan Stenn. 83 */ 84 85#define MAXLINE 8192 /* maximum line length */ 86#define MAXSVLINE MAXLINE /* maximum saved line length */ 87#define DEFUPRI (LOG_USER|LOG_NOTICE) 88#define DEFSPRI (LOG_KERN|LOG_CRIT) 89#define TIMERINTVL 30 /* interval for checking flush, mark */ 90#define TTYMSGTIME 1 /* timeout passed to ttymsg */ 91#define RCVBUF_MINSIZE (80 * 1024) /* minimum size of dgram rcv buffer */ 92 93#include <sys/param.h> 94#include <sys/event.h> 95#include <sys/ioctl.h> 96#include <sys/mman.h> 97#include <sys/procdesc.h> 98#include <sys/queue.h> 99#include <sys/resource.h> 100#include <sys/socket.h> 101#include <sys/stat.h> 102#include <sys/syslimits.h> 103#include <sys/time.h> 104#include <sys/uio.h> 105#include <sys/un.h> 106#include <sys/wait.h> 107 108#if defined(INET) || defined(INET6) 109#include <netinet/in.h> 110#include <arpa/inet.h> 111#endif 112 113#include <assert.h> 114#include <ctype.h> 115#include <dirent.h> 116#include <err.h> 117#include <errno.h> 118#include <fcntl.h> 119#include <fnmatch.h> 120#include <libgen.h> 121#include <libutil.h> 122#include <limits.h> 123#include <netdb.h> 124#include <paths.h> 125#include <poll.h> 126#include <regex.h> 127#include <signal.h> 128#include <stdbool.h> 129#include <stddef.h> 130#include <stdio.h> 131#include <stdlib.h> 132#include <string.h> 133#include <sysexits.h> 134#include <unistd.h> 135#include <utmpx.h> 136 137#include "pathnames.h" 138#include "ttymsg.h" 139 140#define SYSLOG_NAMES 141#include <sys/syslog.h> 142 143static const char *ConfFile = _PATH_LOGCONF; 144static const char *PidFile = _PATH_LOGPID; 145static const char include_str[] = "include"; 146static const char include_ext[] = ".conf"; 147 148#define dprintf if (Debug) printf 149 150#define MAXUNAMES 20 /* maximum number of user names */ 151 152#define sstosa(ss) ((struct sockaddr *)(ss)) 153#ifdef INET 154#define sstosin(ss) ((struct sockaddr_in *)(void *)(ss)) 155#define satosin(sa) ((struct sockaddr_in *)(void *)(sa)) 156#endif 157#ifdef INET6 158#define sstosin6(ss) ((struct sockaddr_in6 *)(void *)(ss)) 159#define satosin6(sa) ((struct sockaddr_in6 *)(void *)(sa)) 160#define s6_addr32 __u6_addr.__u6_addr32 161#define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \ 162 (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \ 163 (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \ 164 (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \ 165 (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 ) 166#endif 167 168/* 169 * List of peers and sockets that can't be bound until 170 * flags have been parsed. 171 */ 172struct peer { 173 const char *pe_name; 174 const char *pe_serv; 175 mode_t pe_mode; 176 STAILQ_ENTRY(peer) next; 177}; 178static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue); 179 180/* 181 * Sockets used for logging; monitored by kevent(). 182 */ 183struct socklist { 184 struct addrinfo sl_ai; 185#define sl_sa sl_ai.ai_addr 186#define sl_salen sl_ai.ai_addrlen 187#define sl_family sl_ai.ai_family 188 int sl_socket; 189 char *sl_name; 190 int sl_dirfd; 191 int (*sl_recv)(struct socklist *); 192 STAILQ_ENTRY(socklist) next; 193}; 194static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead); 195 196/* 197 * Flags to logmsg(). 198 */ 199 200#define IGN_CONS 0x001 /* don't print on console */ 201#define SYNC_FILE 0x002 /* do fsync on file after printing */ 202#define MARK 0x008 /* this message is a mark */ 203#define ISKERNEL 0x010 /* kernel generated message */ 204 205/* Timestamps of log entries. */ 206struct logtime { 207 struct tm tm; 208 suseconds_t usec; 209}; 210 211/* Traditional syslog timestamp format. */ 212#define RFC3164_DATELEN 15 213#define RFC3164_DATEFMT "%b %e %H:%M:%S" 214 215enum filt_proptype { 216 FILT_PROP_NOOP, 217 FILT_PROP_MSG, 218 FILT_PROP_HOSTNAME, 219 FILT_PROP_PROGNAME, 220}; 221 222enum filt_cmptype { 223 FILT_CMP_CONTAINS, 224 FILT_CMP_EQUAL, 225 FILT_CMP_STARTS, 226 FILT_CMP_REGEX, 227}; 228 229/* 230 * This structure holds a property-based filter 231 */ 232struct prop_filter { 233 enum filt_proptype prop_type; 234 enum filt_cmptype cmp_type; 235 uint8_t cmp_flags; 236#define FILT_FLAG_EXCLUDE (1 << 0) 237#define FILT_FLAG_ICASE (1 << 1) 238 union { 239 char *p_strval; 240 regex_t *p_re; 241 } pflt_uniptr; 242#define pflt_strval pflt_uniptr.p_strval 243#define pflt_re pflt_uniptr.p_re 244 size_t pflt_strlen; 245}; 246 247enum f_type { 248 F_UNUSED, /* unused entry */ 249 F_FILE, /* regular file */ 250 F_TTY, /* terminal */ 251 F_CONSOLE, /* console terminal */ 252 F_FORW, /* remote machine */ 253 F_USERS, /* list of users */ 254 F_WALL, /* everyone logged on */ 255 F_PIPE, /* pipe to program */ 256}; 257 258/* 259 * This structure represents the files that will have log 260 * copies printed. 261 * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY 262 * or if f_type is F_PIPE and f_pid > 0. 263 */ 264struct filed { 265 enum f_type f_type; 266 267 /* Used for filtering. */ 268 char *f_host; /* host from which to recd. */ 269 char *f_program; /* program this applies to */ 270 struct prop_filter *f_prop_filter; /* property-based filter */ 271 u_char f_pmask[LOG_NFACILITIES+1]; /* priority mask */ 272 u_char f_pcmp[LOG_NFACILITIES+1]; /* compare priority */ 273#define PRI_LT 0x1 274#define PRI_EQ 0x2 275#define PRI_GT 0x4 276 277 /* Logging destinations. */ 278 int f_file; /* file descriptor */ 279 int f_flags; /* file-specific flags */ 280#define FFLAG_SYNC 0x01 281#define FFLAG_NEEDSYNC 0x02 282 union { 283 char f_uname[MAXUNAMES][MAXLOGNAME]; /* F_WALL, F_USERS */ 284 char f_fname[MAXPATHLEN]; /* F_FILE, F_CONSOLE, F_TTY */ 285 struct { 286 char f_hname[MAXHOSTNAMELEN]; 287 struct addrinfo *f_addr; 288 } f_forw; /* F_FORW */ 289 struct { 290 char f_pname[MAXPATHLEN]; 291 int f_procdesc; 292 } f_pipe; /* F_PIPE */ 293 } f_un; 294#define fu_uname f_un.f_uname 295#define fu_fname f_un.f_fname 296#define fu_forw_hname f_un.f_forw.f_hname 297#define fu_forw_addr f_un.f_forw.f_addr 298#define fu_pipe_pname f_un.f_pipe.f_pname 299#define fu_pipe_pd f_un.f_pipe.f_procdesc 300 301 /* Book-keeping. */ 302 char f_prevline[MAXSVLINE]; /* last message logged */ 303 time_t f_time; /* time this was last written */ 304 struct logtime f_lasttime; /* time of last occurrence */ 305 int f_prevpri; /* pri of f_prevline */ 306 size_t f_prevlen; /* length of f_prevline */ 307 int f_prevcount; /* repetition cnt of prevline */ 308 u_int f_repeatcount; /* number of "repeated" msgs */ 309 STAILQ_ENTRY(filed) next; /* next in linked list */ 310}; 311static STAILQ_HEAD(, filed) fhead = 312 STAILQ_HEAD_INITIALIZER(fhead); /* Log files that we write to */ 313static struct filed consfile; /* Console */ 314 315 316/* 317 * Queue of about-to-be dead processes we should watch out for. 318 */ 319struct deadq_entry { 320 int dq_procdesc; 321 int dq_timeout; 322 TAILQ_ENTRY(deadq_entry) dq_entries; 323}; 324static TAILQ_HEAD(, deadq_entry) deadq_head = 325 TAILQ_HEAD_INITIALIZER(deadq_head); 326 327/* 328 * The timeout to apply to processes waiting on the dead queue. Unit 329 * of measure is `mark intervals', i.e. 20 minutes by default. 330 * Processes on the dead queue will be terminated after that time. 331 */ 332 333#define DQ_TIMO_INIT 2 334 335/* 336 * Network addresses that are allowed to log to us. 337 */ 338struct allowedpeer { 339 bool isnumeric; 340 u_short port; 341 union { 342 struct { 343 struct sockaddr_storage addr; 344 struct sockaddr_storage mask; 345 } numeric; 346 char *name; 347 } u; 348#define a_addr u.numeric.addr 349#define a_mask u.numeric.mask 350#define a_name u.name 351 STAILQ_ENTRY(allowedpeer) next; 352}; 353static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead); 354 355/* 356 * Intervals at which we flush out "message repeated" messages, 357 * in seconds after previous message is logged. After each flush, 358 * we move to the next interval until we reach the largest. 359 */ 360static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */ 361#define MAXREPEAT (nitems(repeatinterval) - 1) 362#define REPEATTIME(f) ((f)->f_time + repeatinterval[(f)->f_repeatcount]) 363#define BACKOFF(f) do { \ 364 if (++(f)->f_repeatcount > MAXREPEAT) \ 365 (f)->f_repeatcount = MAXREPEAT; \ 366 } while (0) 367 368static const char *TypeNames[] = { 369 "UNUSED", 370 "FILE", 371 "TTY", 372 "CONSOLE", 373 "FORW", 374 "USERS", 375 "WALL", 376 "PIPE", 377}; 378 379static const int sigcatch[] = { 380 SIGHUP, 381 SIGINT, 382 SIGQUIT, 383 SIGPIPE, 384 SIGALRM, 385 SIGTERM, 386 SIGCHLD, 387}; 388 389static int nulldesc; /* /dev/null descriptor */ 390static bool Debug; /* debug flag */ 391static bool Foreground = false; /* Run in foreground, instead of daemonizing */ 392static bool resolve = true; /* resolve hostname */ 393static char LocalHostName[MAXHOSTNAMELEN]; /* our hostname */ 394static const char *LocalDomain; /* our local domain name */ 395static bool Initialized; /* set when we have initialized ourselves */ 396static int MarkInterval = 20 * 60; /* interval between marks in seconds */ 397static int MarkSeq; /* mark sequence number */ 398static bool NoBind; /* don't bind() as suggested by RFC 3164 */ 399static int SecureMode; /* when true, receive only unix domain socks */ 400static int MaxForwardLen = 1024; /* max length of forwared message */ 401#ifdef INET6 402static int family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */ 403#else 404static int family = PF_INET; /* protocol family (IPv4 only) */ 405#endif 406static int mask_C1 = 1; /* mask characters from 0x80 - 0x9F */ 407static int send_to_all; /* send message to all IPv4/IPv6 addresses */ 408static int use_bootfile; /* log entire bootfile for every kern msg */ 409static int no_compress; /* don't compress messages (1=pipes, 2=all) */ 410static int logflags = O_WRONLY|O_APPEND; /* flags used to open log files */ 411 412static char bootfile[MAXPATHLEN]; /* booted kernel file */ 413 414static bool RemoteAddDate; /* Always set the date on remote messages */ 415static bool RemoteHostname; /* Log remote hostname from the message */ 416 417static bool UniquePriority; /* Only log specified priority? */ 418static int LogFacPri; /* Put facility and priority in log message: */ 419 /* 0=no, 1=numeric, 2=names */ 420static bool KeepKernFac; /* Keep remotely logged kernel facility */ 421static bool needdofsync = true; /* Are any file(s) waiting to be fsynced? */ 422static struct pidfh *pfh; 423static bool RFC3164OutputFormat = true; /* Use legacy format by default. */ 424 425struct iovlist; 426 427static bool allowaddr(char *); 428static void addpeer(const char *, const char *, mode_t); 429static void addsock(const char *, const char *, mode_t); 430static void cfline(const char *, const char *, const char *, const char *); 431static const char *cvthname(struct sockaddr *); 432static void deadq_enter(int); 433static void deadq_remove(struct deadq_entry *); 434static int decode(const char *, const CODE *); 435static void die(int) __dead2; 436static void dofsync(void); 437static void fprintlog_first(struct filed *, const char *, const char *, 438 const char *, const char *, const char *, const char *, int); 439static void fprintlog_write(struct filed *, struct iovlist *, int); 440static void fprintlog_successive(struct filed *, int); 441static void init(bool); 442static void logerror(const char *); 443static void logmsg(int, const struct logtime *, const char *, const char *, 444 const char *, const char *, const char *, const char *, int); 445static void markit(void); 446static struct socklist *socksetup(struct addrinfo *, const char *, mode_t); 447static int socklist_recv_file(struct socklist *); 448static int socklist_recv_sock(struct socklist *); 449static int skip_message(const char *, const char *, int); 450static int evaluate_prop_filter(const struct prop_filter *filter, 451 const char *value); 452static struct prop_filter *prop_filter_compile(const char *); 453static void parsemsg(const char *, char *); 454static void printsys(char *); 455static int p_open(const char *, pid_t *); 456static const char *ttymsg_check(struct iovec *, int, char *, int); 457static void usage(void); 458static bool validate(struct sockaddr *, const char *); 459static void unmapped(struct sockaddr *); 460static void wallmsg(struct filed *, struct iovec *, const int iovlen); 461static int waitdaemon(int); 462static void increase_rcvbuf(int); 463 464static void 465close_filed(struct filed *f) 466{ 467 468 if (f == NULL || f->f_file == -1) 469 return; 470 471 switch (f->f_type) { 472 case F_FORW: 473 if (f->fu_forw_addr != NULL) { 474 freeaddrinfo(f->fu_forw_addr); 475 f->fu_forw_addr = NULL; 476 } 477 /* FALLTHROUGH */ 478 case F_FILE: 479 case F_TTY: 480 case F_CONSOLE: 481 f->f_type = F_UNUSED; 482 break; 483 case F_PIPE: 484 if (f->fu_pipe_pd >= 0) { 485 deadq_enter(f->fu_pipe_pd); 486 f->fu_pipe_pd = -1; 487 } 488 break; 489 default: 490 break; 491 } 492 (void)close(f->f_file); 493 f->f_file = -1; 494} 495 496static void 497addpeer(const char *name, const char *serv, mode_t mode) 498{ 499 struct peer *pe = calloc(1, sizeof(*pe)); 500 if (pe == NULL) 501 err(1, "malloc failed"); 502 pe->pe_name = name; 503 pe->pe_serv = serv; 504 pe->pe_mode = mode; 505 STAILQ_INSERT_TAIL(&pqueue, pe, next); 506} 507 508static void 509addsock(const char *name, const char *serv, mode_t mode) 510{ 511 struct addrinfo hints = { }, *res, *res0; 512 struct socklist *sl; 513 int error; 514 char *cp, *msgbuf; 515 516 /* 517 * We have to handle this case for backwards compatibility: 518 * If there are two (or more) colons but no '[' and ']', 519 * assume this is an inet6 address without a service. 520 */ 521 if (name != NULL) { 522#ifdef INET6 523 if (name[0] == '[' && 524 (cp = strchr(name + 1, ']')) != NULL) { 525 name = &name[1]; 526 *cp = '\0'; 527 if (cp[1] == ':' && cp[2] != '\0') 528 serv = cp + 2; 529 } else { 530#endif 531 cp = strchr(name, ':'); 532 if (cp != NULL && strchr(cp + 1, ':') == NULL) { 533 *cp = '\0'; 534 if (cp[1] != '\0') 535 serv = cp + 1; 536 if (cp == name) 537 name = NULL; 538 } 539#ifdef INET6 540 } 541#endif 542 } 543 hints.ai_family = AF_UNSPEC; 544 hints.ai_socktype = SOCK_DGRAM; 545 hints.ai_flags = AI_PASSIVE; 546 if (name != NULL) 547 dprintf("Trying peer: %s\n", name); 548 if (serv == NULL) 549 serv = "syslog"; 550 error = getaddrinfo(name, serv, &hints, &res0); 551 if (error) { 552 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s", 553 name == NULL ? "" : name, serv, 554 gai_strerror(error)); 555 errno = 0; 556 if (msgbuf == NULL) 557 logerror(gai_strerror(error)); 558 else 559 logerror(msgbuf); 560 free(msgbuf); 561 die(0); 562 } 563 for (res = res0; res != NULL; res = res->ai_next) { 564 sl = socksetup(res, name, mode); 565 if (sl == NULL) 566 continue; 567 STAILQ_INSERT_TAIL(&shead, sl, next); 568 } 569 freeaddrinfo(res0); 570} 571 572static void 573addfile(int fd) 574{ 575 struct socklist *sl = calloc(1, sizeof(*sl)); 576 if (sl == NULL) 577 err(1, "malloc failed"); 578 sl->sl_socket = fd; 579 sl->sl_recv = socklist_recv_file; 580 STAILQ_INSERT_TAIL(&shead, sl, next); 581} 582 583int 584main(int argc, char *argv[]) 585{ 586 struct sigaction act = { }; 587 struct kevent ev; 588 struct socklist *sl; 589 pid_t spid; 590 int ch, kq, ppipe_w = -1, s; 591 char *p; 592 bool bflag = false, pflag = false, Sflag = false; 593 594 if (madvise(NULL, 0, MADV_PROTECT) != 0) 595 dprintf("madvise() failed: %s\n", strerror(errno)); 596 597 while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv")) 598 != -1) 599 switch (ch) { 600#ifdef INET 601 case '4': 602 family = PF_INET; 603 break; 604#endif 605#ifdef INET6 606 case '6': 607 family = PF_INET6; 608 break; 609#endif 610 case '8': 611 mask_C1 = 0; 612 break; 613 case 'A': 614 send_to_all = true; 615 break; 616 case 'a': /* allow specific network addresses only */ 617 if (!allowaddr(optarg)) 618 usage(); 619 break; 620 case 'b': 621 bflag = true; 622 p = strchr(optarg, ']'); 623 if (p != NULL) 624 p = strchr(p + 1, ':'); 625 else { 626 p = strchr(optarg, ':'); 627 if (p != NULL && strchr(p + 1, ':') != NULL) 628 p = NULL; /* backward compatibility */ 629 } 630 if (p == NULL) { 631 /* A hostname or filename only. */ 632 addpeer(optarg, "syslog", 0); 633 } else { 634 /* The case of "name:service". */ 635 *p++ = '\0'; 636 addpeer(strlen(optarg) == 0 ? NULL : optarg, 637 p, 0); 638 } 639 break; 640 case 'c': 641 no_compress++; 642 break; 643 case 'C': 644 logflags |= O_CREAT; 645 break; 646 case 'd': /* debug */ 647 Debug = true; 648 break; 649 case 'f': /* configuration file */ 650 ConfFile = optarg; 651 break; 652 case 'F': /* run in foreground instead of daemon */ 653 Foreground = true; 654 break; 655 case 'H': 656 RemoteHostname = true; 657 break; 658 case 'k': /* keep remote kern fac */ 659 KeepKernFac = true; 660 break; 661 case 'l': 662 case 'p': 663 case 'S': 664 { 665 long perml; 666 mode_t mode; 667 char *name, *ep; 668 669 if (ch == 'l') 670 mode = DEFFILEMODE; 671 else if (ch == 'p') { 672 mode = DEFFILEMODE; 673 pflag = true; 674 } else { 675 mode = S_IRUSR | S_IWUSR; 676 Sflag = true; 677 } 678 if (optarg[0] == '/') 679 name = optarg; 680 else if ((name = strchr(optarg, ':')) != NULL) { 681 *name++ = '\0'; 682 if (name[0] != '/') 683 errx(1, "socket name must be absolute " 684 "path"); 685 if (isdigit(*optarg)) { 686 perml = strtol(optarg, &ep, 8); 687 if (*ep || perml < 0 || 688 perml & ~(S_IRWXU|S_IRWXG|S_IRWXO)) 689 errx(1, "invalid mode %s, exiting", 690 optarg); 691 mode = (mode_t )perml; 692 } else 693 errx(1, "invalid mode %s, exiting", 694 optarg); 695 } else 696 errx(1, "invalid filename %s, exiting", 697 optarg); 698 addpeer(name, NULL, mode); 699 break; 700 } 701 case 'M': /* max length of forwarded message */ 702 MaxForwardLen = atoi(optarg); 703 if (MaxForwardLen < 480) 704 errx(1, "minimum length limit of forwarded " 705 "messages is 480 bytes"); 706 break; 707 case 'm': /* mark interval */ 708 MarkInterval = atoi(optarg) * 60; 709 break; 710 case 'N': 711 NoBind = true; 712 if (!SecureMode) 713 SecureMode = 1; 714 break; 715 case 'n': 716 resolve = false; 717 break; 718 case 'O': 719 if (strcmp(optarg, "bsd") == 0 || 720 strcmp(optarg, "rfc3164") == 0) 721 RFC3164OutputFormat = true; 722 else if (strcmp(optarg, "syslog") == 0 || 723 strcmp(optarg, "rfc5424") == 0) 724 RFC3164OutputFormat = false; 725 else 726 usage(); 727 break; 728 case 'o': 729 use_bootfile = true; 730 break; 731 case 'P': /* path for alt. PID */ 732 PidFile = optarg; 733 break; 734 case 's': /* no network mode */ 735 SecureMode++; 736 break; 737 case 'T': 738 RemoteAddDate = true; 739 break; 740 case 'u': /* only log specified priority */ 741 UniquePriority = true; 742 break; 743 case 'v': /* log facility and priority */ 744 LogFacPri++; 745 break; 746 default: 747 usage(); 748 } 749 if ((argc -= optind) != 0) 750 usage(); 751 752 if (RFC3164OutputFormat && MaxForwardLen > 1024) 753 errx(1, "RFC 3164 messages may not exceed 1024 bytes"); 754 755 pfh = pidfile_open(PidFile, 0600, &spid); 756 if (pfh == NULL) { 757 if (errno == EEXIST) 758 errx(1, "syslogd already running, pid: %d", spid); 759 warn("cannot open pid file"); 760 } 761 762 /* 763 * Now that flags have been parsed, we know if we're in 764 * secure mode. Add peers to the socklist, if allowed. 765 */ 766 while (!STAILQ_EMPTY(&pqueue)) { 767 struct peer *pe = STAILQ_FIRST(&pqueue); 768 STAILQ_REMOVE_HEAD(&pqueue, next); 769 addsock(pe->pe_name, pe->pe_serv, pe->pe_mode); 770 free(pe); 771 } 772 /* Listen by default: /dev/klog. */ 773 s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0); 774 if (s < 0) { 775 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno); 776 } else { 777 addfile(s); 778 } 779 /* Listen by default: *:514 if no -b flag. */ 780 if (bflag == 0) 781 addsock(NULL, "syslog", 0); 782 /* Listen by default: /var/run/log if no -p flag. */ 783 if (pflag == 0) 784 addsock(_PATH_LOG, NULL, DEFFILEMODE); 785 /* Listen by default: /var/run/logpriv if no -S flag. */ 786 if (Sflag == 0) 787 addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR); 788 789 consfile.f_type = F_CONSOLE; 790 consfile.f_file = -1; 791 (void)strlcpy(consfile.fu_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1, 792 sizeof(consfile.fu_fname)); 793 794 nulldesc = open(_PATH_DEVNULL, O_RDWR); 795 if (nulldesc == -1) { 796 warn("cannot open %s", _PATH_DEVNULL); 797 pidfile_remove(pfh); 798 exit(1); 799 } 800 801 (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile)); 802 803 if (!Foreground && !Debug) 804 ppipe_w = waitdaemon(30); 805 else if (Debug) 806 setlinebuf(stdout); 807 808 kq = kqueue(); 809 if (kq == -1) { 810 warn("failed to initialize kqueue"); 811 pidfile_remove(pfh); 812 exit(1); 813 } 814 STAILQ_FOREACH(sl, &shead, next) { 815 if (sl->sl_recv == NULL) 816 continue; 817 EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl); 818 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 819 warn("failed to add kevent to kqueue"); 820 pidfile_remove(pfh); 821 exit(1); 822 } 823 } 824 825 /* 826 * Syslogd will not reap its children via wait(). 827 * When SIGCHLD is ignored, zombie processes are 828 * not created. A child's PID will be recycled 829 * upon its exit. 830 */ 831 act.sa_handler = SIG_IGN; 832 for (size_t i = 0; i < nitems(sigcatch); ++i) { 833 EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL); 834 if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) { 835 warn("failed to add kevent to kqueue"); 836 pidfile_remove(pfh); 837 exit(1); 838 } 839 if (sigaction(sigcatch[i], &act, NULL) == -1) { 840 warn("failed to apply signal handler"); 841 pidfile_remove(pfh); 842 exit(1); 843 } 844 } 845 (void)alarm(TIMERINTVL); 846 847 /* tuck my process id away */ 848 pidfile_write(pfh); 849 850 dprintf("off & running....\n"); 851 init(false); 852 for (;;) { 853 if (needdofsync) { 854 dofsync(); 855 if (ppipe_w != -1) { 856 /* 857 * Close our end of the pipe so our 858 * parent knows that we have finished 859 * initialization. 860 */ 861 (void)close(ppipe_w); 862 ppipe_w = -1; 863 } 864 } 865 if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) { 866 if (errno != EINTR) 867 logerror("kevent"); 868 continue; 869 } 870 switch (ev.filter) { 871 case EVFILT_READ: 872 sl = ev.udata; 873 if (sl->sl_socket != -1 && sl->sl_recv != NULL) 874 sl->sl_recv(sl); 875 break; 876 case EVFILT_SIGNAL: 877 switch (ev.ident) { 878 case SIGHUP: 879 init(true); 880 break; 881 case SIGINT: 882 case SIGQUIT: 883 case SIGTERM: 884 if (ev.ident == SIGTERM || Debug) 885 die(ev.ident); 886 break; 887 case SIGALRM: 888 markit(); 889 break; 890 } 891 break; 892 } 893 } 894} 895 896static int 897socklist_recv_sock(struct socklist *sl) 898{ 899 struct sockaddr_storage ss; 900 struct sockaddr *sa = (struct sockaddr *)&ss; 901 socklen_t sslen; 902 const char *hname; 903 char line[MAXLINE + 1]; 904 int len; 905 906 sslen = sizeof(ss); 907 len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen); 908 dprintf("received sa_len = %d\n", sslen); 909 if (len == 0) 910 return (-1); 911 if (len < 0) { 912 if (errno != EINTR) 913 logerror("recvfrom"); 914 return (-1); 915 } 916 /* Received valid data. */ 917 line[len] = '\0'; 918 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) 919 hname = LocalHostName; 920 else { 921 hname = cvthname(sa); 922 unmapped(sa); 923 if (validate(sa, hname) == 0) { 924 dprintf("Message from %s was ignored.", hname); 925 return (-1); 926 } 927 } 928 parsemsg(hname, line); 929 930 return (0); 931} 932 933static void 934unmapped(struct sockaddr *sa) 935{ 936#if defined(INET) && defined(INET6) 937 struct sockaddr_in6 *sin6; 938 struct sockaddr_in sin; 939 940 if (sa == NULL || 941 sa->sa_family != AF_INET6 || 942 sa->sa_len != sizeof(*sin6)) 943 return; 944 sin6 = satosin6(sa); 945 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 946 return; 947 sin = (struct sockaddr_in){ 948 .sin_family = AF_INET, 949 .sin_len = sizeof(sin), 950 .sin_port = sin6->sin6_port 951 }; 952 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 953 sizeof(sin.sin_addr)); 954 memcpy(sa, &sin, sizeof(sin)); 955#else 956 if (sa == NULL) 957 return; 958#endif 959} 960 961static void 962usage(void) 963{ 964 965 fprintf(stderr, 966 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n" 967 " [-b bind_address] [-f config_file]\n" 968 " [-l [mode:]path] [-M fwd_length]\n" 969 " [-m mark_interval] [-O format] [-P pid_file]\n" 970 " [-p log_socket] [-S logpriv_socket]\n"); 971 exit(1); 972} 973 974/* 975 * Removes characters from log messages that are unsafe to display. 976 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424? 977 */ 978static void 979parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen) 980{ 981 char *q; 982 int c; 983 984 q = out; 985 while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) { 986 if (mask_C1 && (c & 0x80) && c < 0xA0) { 987 c &= 0x7F; 988 *q++ = 'M'; 989 *q++ = '-'; 990 } 991 if (isascii(c) && iscntrl(c)) { 992 if (c == '\n') { 993 *q++ = ' '; 994 } else if (c == '\t') { 995 *q++ = '\t'; 996 } else { 997 *q++ = '^'; 998 *q++ = c ^ 0100; 999 } 1000 } else { 1001 *q++ = c; 1002 } 1003 } 1004 *q = '\0'; 1005} 1006 1007/* 1008 * Parses a syslog message according to RFC 5424, assuming that PRI and 1009 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The 1010 * parsed result is passed to logmsg(). 1011 */ 1012static void 1013parsemsg_rfc5424(const char *from, int pri, char *msg) 1014{ 1015 const struct logtime *timestamp; 1016 struct logtime timestamp_remote; 1017 const char *omsg, *hostname, *app_name, *procid, *msgid, 1018 *structured_data; 1019 char line[MAXLINE + 1]; 1020 1021#define FAIL_IF(field, expr) do { \ 1022 if (expr) { \ 1023 dprintf("Failed to parse " field " from %s: %s\n", \ 1024 from, omsg); \ 1025 return; \ 1026 } \ 1027} while (0) 1028#define PARSE_CHAR(field, sep) do { \ 1029 FAIL_IF(field, *msg != sep); \ 1030 ++msg; \ 1031} while (0) 1032#define IF_NOT_NILVALUE(var) \ 1033 if (msg[0] == '-' && msg[1] == ' ') { \ 1034 msg += 2; \ 1035 var = NULL; \ 1036 } else if (msg[0] == '-' && msg[1] == '\0') { \ 1037 ++msg; \ 1038 var = NULL; \ 1039 } else 1040 1041 omsg = msg; 1042 IF_NOT_NILVALUE(timestamp) { 1043 /* Parse RFC 3339-like timestamp. */ 1044#define PARSE_NUMBER(dest, length, min, max) do { \ 1045 int i, v; \ 1046 \ 1047 v = 0; \ 1048 for (i = 0; i < length; ++i) { \ 1049 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9'); \ 1050 v = v * 10 + *msg++ - '0'; \ 1051 } \ 1052 FAIL_IF("TIMESTAMP", v < min || v > max); \ 1053 dest = v; \ 1054} while (0) 1055 /* Date and time. */ 1056 memset(×tamp_remote, 0, sizeof(timestamp_remote)); 1057 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999); 1058 timestamp_remote.tm.tm_year -= 1900; 1059 PARSE_CHAR("TIMESTAMP", '-'); 1060 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12); 1061 --timestamp_remote.tm.tm_mon; 1062 PARSE_CHAR("TIMESTAMP", '-'); 1063 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31); 1064 PARSE_CHAR("TIMESTAMP", 'T'); 1065 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23); 1066 PARSE_CHAR("TIMESTAMP", ':'); 1067 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59); 1068 PARSE_CHAR("TIMESTAMP", ':'); 1069 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59); 1070 /* Perform normalization. */ 1071 timegm(×tamp_remote.tm); 1072 /* Optional: fractional seconds. */ 1073 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') { 1074 int i; 1075 1076 ++msg; 1077 for (i = 100000; i != 0; i /= 10) { 1078 if (*msg < '0' || *msg > '9') 1079 break; 1080 timestamp_remote.usec += (*msg++ - '0') * i; 1081 } 1082 } 1083 /* Timezone. */ 1084 if (*msg == 'Z') { 1085 /* UTC. */ 1086 ++msg; 1087 } else { 1088 int sign, tz_hour, tz_min; 1089 1090 /* Local time zone offset. */ 1091 FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+'); 1092 sign = *msg++ == '-' ? -1 : 1; 1093 PARSE_NUMBER(tz_hour, 2, 0, 23); 1094 PARSE_CHAR("TIMESTAMP", ':'); 1095 PARSE_NUMBER(tz_min, 2, 0, 59); 1096 timestamp_remote.tm.tm_gmtoff = 1097 sign * (tz_hour * 3600 + tz_min * 60); 1098 } 1099#undef PARSE_NUMBER 1100 PARSE_CHAR("TIMESTAMP", ' '); 1101 timestamp = RemoteAddDate ? NULL : ×tamp_remote; 1102 } 1103 1104 /* String fields part of the HEADER. */ 1105#define PARSE_STRING(field, var) \ 1106 IF_NOT_NILVALUE(var) { \ 1107 var = msg; \ 1108 while (*msg >= '!' && *msg <= '~') \ 1109 ++msg; \ 1110 FAIL_IF(field, var == msg); \ 1111 PARSE_CHAR(field, ' '); \ 1112 msg[-1] = '\0'; \ 1113 } 1114 PARSE_STRING("HOSTNAME", hostname); 1115 if (hostname == NULL || !RemoteHostname) 1116 hostname = from; 1117 PARSE_STRING("APP-NAME", app_name); 1118 PARSE_STRING("PROCID", procid); 1119 PARSE_STRING("MSGID", msgid); 1120#undef PARSE_STRING 1121 1122 /* Structured data. */ 1123#define PARSE_SD_NAME() do { \ 1124 const char *start; \ 1125 \ 1126 start = msg; \ 1127 while (*msg >= '!' && *msg <= '~' && *msg != '=' && \ 1128 *msg != ']' && *msg != '"') \ 1129 ++msg; \ 1130 FAIL_IF("STRUCTURED-NAME", start == msg); \ 1131} while (0) 1132 IF_NOT_NILVALUE(structured_data) { 1133 structured_data = msg; 1134 /* SD-ELEMENT. */ 1135 while (*msg == '[') { 1136 ++msg; 1137 /* SD-ID. */ 1138 PARSE_SD_NAME(); 1139 /* SD-PARAM. */ 1140 while (*msg == ' ') { 1141 ++msg; 1142 /* PARAM-NAME. */ 1143 PARSE_SD_NAME(); 1144 PARSE_CHAR("STRUCTURED-NAME", '='); 1145 PARSE_CHAR("STRUCTURED-NAME", '"'); 1146 while (*msg != '"') { 1147 FAIL_IF("STRUCTURED-NAME", 1148 *msg == '\0'); 1149 if (*msg++ == '\\') { 1150 FAIL_IF("STRUCTURED-NAME", 1151 *msg == '\0'); 1152 ++msg; 1153 } 1154 } 1155 ++msg; 1156 } 1157 PARSE_CHAR("STRUCTURED-NAME", ']'); 1158 } 1159 PARSE_CHAR("STRUCTURED-NAME", ' '); 1160 msg[-1] = '\0'; 1161 } 1162#undef PARSE_SD_NAME 1163 1164#undef FAIL_IF 1165#undef PARSE_CHAR 1166#undef IF_NOT_NILVALUE 1167 1168 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1169 logmsg(pri, timestamp, hostname, app_name, procid, msgid, 1170 structured_data, line, 0); 1171} 1172 1173/* 1174 * Returns the length of the application name ("TAG" in RFC 3164 1175 * terminology) and process ID from a message if present. 1176 */ 1177static void 1178parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p, 1179 ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p) 1180{ 1181 const char *m, *procid_begin; 1182 size_t app_name_length, procid_length; 1183 1184 m = msg; 1185 1186 /* Application name. */ 1187 app_name_length = strspn(m, 1188 "abcdefghijklmnopqrstuvwxyz" 1189 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" 1190 "0123456789" 1191 "_-/"); 1192 if (app_name_length == 0) 1193 goto bad; 1194 m += app_name_length; 1195 1196 /* Process identifier (optional). */ 1197 if (*m == '[') { 1198 procid_begin = ++m; 1199 procid_length = strspn(m, "0123456789"); 1200 if (procid_length == 0) 1201 goto bad; 1202 m += procid_length; 1203 if (*m++ != ']') 1204 goto bad; 1205 } else { 1206 procid_begin = NULL; 1207 procid_length = 0; 1208 } 1209 1210 /* Separator. */ 1211 if (m[0] != ':' || m[1] != ' ') 1212 goto bad; 1213 1214 *app_name_length_p = app_name_length; 1215 if (procid_begin_offset_p != NULL) 1216 *procid_begin_offset_p = 1217 procid_begin == NULL ? 0 : procid_begin - msg; 1218 if (procid_length_p != NULL) 1219 *procid_length_p = procid_length; 1220 return; 1221bad: 1222 *app_name_length_p = 0; 1223 if (procid_begin_offset_p != NULL) 1224 *procid_begin_offset_p = 0; 1225 if (procid_length_p != NULL) 1226 *procid_length_p = 0; 1227} 1228 1229/* 1230 * Trims the application name ("TAG" in RFC 3164 terminology) and 1231 * process ID from a message if present. 1232 */ 1233static void 1234parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name, 1235 const char **procid) 1236{ 1237 char *m, *app_name_begin, *procid_begin; 1238 size_t app_name_length, procid_length; 1239 ptrdiff_t procid_begin_offset; 1240 1241 m = *msg; 1242 app_name_begin = m; 1243 1244 parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length, 1245 &procid_begin_offset, &procid_length); 1246 if (app_name_length == 0) 1247 goto bad; 1248 procid_begin = procid_begin_offset == 0 ? NULL : 1249 app_name_begin + procid_begin_offset; 1250 1251 /* Split strings from input. */ 1252 app_name_begin[app_name_length] = '\0'; 1253 m += app_name_length + 1; 1254 if (procid_begin != NULL) { 1255 procid_begin[procid_length] = '\0'; 1256 m += procid_length + 2; 1257 } 1258 1259 *msg = m + 1; 1260 *app_name = app_name_begin; 1261 *procid = procid_begin; 1262 return; 1263bad: 1264 *app_name = NULL; 1265 *procid = NULL; 1266} 1267 1268/* 1269 * Parses a syslog message according to RFC 3164, assuming that PRI 1270 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed 1271 * result is passed to logmsg(). 1272 */ 1273static void 1274parsemsg_rfc3164(const char *from, int pri, char *msg) 1275{ 1276 struct tm tm_parsed; 1277 const struct logtime *timestamp; 1278 struct logtime timestamp_remote; 1279 const char *app_name, *procid; 1280 size_t i, msglen; 1281 char line[MAXLINE + 1]; 1282 1283 /* 1284 * Parse the TIMESTAMP provided by the remote side. If none is 1285 * found, assume this is not an RFC 3164 formatted message, 1286 * only containing a TAG and a MSG. 1287 */ 1288 timestamp = NULL; 1289 if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) == 1290 msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') { 1291 msg += RFC3164_DATELEN + 1; 1292 if (!RemoteAddDate) { 1293 struct tm tm_now; 1294 time_t t_now; 1295 int year; 1296 1297 /* 1298 * As the timestamp does not contain the year 1299 * number, daylight saving time information, nor 1300 * a time zone, attempt to infer it. Due to 1301 * clock skews, the timestamp may even be part 1302 * of the next year. Use the last year for which 1303 * the timestamp is at most one week in the 1304 * future. 1305 * 1306 * This loop can only run for at most three 1307 * iterations before terminating. 1308 */ 1309 t_now = time(NULL); 1310 localtime_r(&t_now, &tm_now); 1311 for (year = tm_now.tm_year + 1;; --year) { 1312 assert(year >= tm_now.tm_year - 1); 1313 timestamp_remote.tm = tm_parsed; 1314 timestamp_remote.tm.tm_year = year; 1315 timestamp_remote.tm.tm_isdst = -1; 1316 timestamp_remote.usec = 0; 1317 if (mktime(×tamp_remote.tm) < 1318 t_now + 7 * 24 * 60 * 60) 1319 break; 1320 } 1321 timestamp = ×tamp_remote; 1322 } 1323 1324 /* 1325 * A single space character MUST also follow the HOSTNAME field. 1326 */ 1327 msglen = strlen(msg); 1328 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) { 1329 if (msg[i] == ' ') { 1330 if (RemoteHostname) { 1331 msg[i] = '\0'; 1332 from = msg; 1333 } 1334 msg += i + 1; 1335 break; 1336 } 1337 /* 1338 * Support non RFC compliant messages, without hostname. 1339 */ 1340 if (msg[i] == ':') 1341 break; 1342 } 1343 if (i == MIN(MAXHOSTNAMELEN, msglen)) { 1344 dprintf("Invalid HOSTNAME from %s: %s\n", from, msg); 1345 return; 1346 } 1347 } 1348 1349 /* Remove the TAG, if present. */ 1350 parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid); 1351 parsemsg_remove_unsafe_characters(msg, line, sizeof(line)); 1352 logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0); 1353} 1354 1355/* 1356 * Takes a raw input line, extracts PRI and determines whether the 1357 * message is formatted according to RFC 3164 or RFC 5424. Continues 1358 * parsing of addition fields in the message according to those 1359 * standards and prints the message on the appropriate log files. 1360 */ 1361static void 1362parsemsg(const char *from, char *msg) 1363{ 1364 char *q; 1365 long n; 1366 size_t i; 1367 int pri; 1368 1369 i = -1; 1370 pri = DEFUPRI; 1371 1372 /* Parse PRI. */ 1373 if (msg[0] == '<' && isdigit(msg[1])) { 1374 for (i = 2; i <= 4; i++) { 1375 if (msg[i] == '>') { 1376 errno = 0; 1377 n = strtol(msg + 1, &q, 10); 1378 if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) { 1379 pri = n; 1380 msg += i + 1; 1381 i = 0; 1382 } 1383 break; 1384 } 1385 } 1386 } 1387 1388 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1389 pri = DEFUPRI; 1390 1391 /* 1392 * Don't allow users to log kernel messages. 1393 * NOTE: since LOG_KERN == 0 this will also match 1394 * messages with no facility specified. 1395 */ 1396 if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac) 1397 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri)); 1398 1399 /* Parse VERSION. */ 1400 if (i == 0 && msg[0] == '1' && msg[1] == ' ') 1401 parsemsg_rfc5424(from, pri, msg + 2); 1402 else 1403 parsemsg_rfc3164(from, pri, msg); 1404} 1405 1406/* 1407 * Read /dev/klog while data are available, split into lines. 1408 */ 1409static int 1410socklist_recv_file(struct socklist *sl) 1411{ 1412 char *p, *q, line[MAXLINE + 1]; 1413 int len, i; 1414 1415 len = 0; 1416 for (;;) { 1417 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len); 1418 if (i > 0) { 1419 line[i + len] = '\0'; 1420 } else { 1421 if (i < 0 && errno != EINTR && errno != EAGAIN) { 1422 logerror("klog"); 1423 close(sl->sl_socket); 1424 sl->sl_socket = -1; 1425 } 1426 break; 1427 } 1428 1429 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) { 1430 *q = '\0'; 1431 printsys(p); 1432 } 1433 len = strlen(p); 1434 if (len >= MAXLINE - 1) { 1435 printsys(p); 1436 len = 0; 1437 } 1438 if (len > 0) 1439 memmove(line, p, len + 1); 1440 } 1441 if (len > 0) 1442 printsys(line); 1443 1444 return (len); 1445} 1446 1447/* 1448 * Take a raw input line from /dev/klog, format similar to syslog(). 1449 */ 1450static void 1451printsys(char *msg) 1452{ 1453 char *p, *q; 1454 long n; 1455 int flags, isprintf, pri; 1456 1457 flags = ISKERNEL | SYNC_FILE; /* fsync after write */ 1458 p = msg; 1459 pri = DEFSPRI; 1460 isprintf = 1; 1461 if (*p == '<') { 1462 errno = 0; 1463 n = strtol(p + 1, &q, 10); 1464 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) { 1465 p = q + 1; 1466 pri = n; 1467 isprintf = 0; 1468 } 1469 } 1470 /* 1471 * Kernel printf's and LOG_CONSOLE messages have been displayed 1472 * on the console already. 1473 */ 1474 if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE) 1475 flags |= IGN_CONS; 1476 if (pri &~ (LOG_FACMASK|LOG_PRIMASK)) 1477 pri = DEFSPRI; 1478 logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags); 1479} 1480 1481static time_t now; 1482 1483/* 1484 * Match a program or host name against a specification. 1485 * Return a non-0 value if the message must be ignored 1486 * based on the specification. 1487 */ 1488static int 1489skip_message(const char *name, const char *spec, int checkcase) 1490{ 1491 const char *s; 1492 char prev, next; 1493 int exclude = 0; 1494 /* Behaviour on explicit match */ 1495 1496 if (spec == NULL) 1497 return (0); 1498 switch (*spec) { 1499 case '-': 1500 exclude = 1; 1501 /*FALLTHROUGH*/ 1502 case '+': 1503 spec++; 1504 break; 1505 default: 1506 break; 1507 } 1508 if (checkcase) 1509 s = strstr (spec, name); 1510 else 1511 s = strcasestr (spec, name); 1512 1513 if (s != NULL) { 1514 prev = (s == spec ? ',' : *(s - 1)); 1515 next = *(s + strlen (name)); 1516 1517 if (prev == ',' && (next == '\0' || next == ',')) 1518 /* Explicit match: skip iff the spec is an 1519 exclusive one. */ 1520 return (exclude); 1521 } 1522 1523 /* No explicit match for this name: skip the message iff 1524 the spec is an inclusive one. */ 1525 return (!exclude); 1526} 1527 1528/* 1529 * Match some property of the message against a filter. 1530 * Return a non-0 value if the message must be ignored 1531 * based on the filter. 1532 */ 1533static int 1534evaluate_prop_filter(const struct prop_filter *filter, const char *value) 1535{ 1536 const char *s = NULL; 1537 const int exclude = ((filter->cmp_flags & FILT_FLAG_EXCLUDE) > 0); 1538 size_t valuelen; 1539 1540 if (value == NULL) 1541 return (-1); 1542 1543 if (filter->cmp_type == FILT_CMP_REGEX) { 1544 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0) 1545 return (exclude); 1546 else 1547 return (!exclude); 1548 } 1549 1550 valuelen = strlen(value); 1551 1552 /* a shortcut for equal with different length is always false */ 1553 if (filter->cmp_type == FILT_CMP_EQUAL && 1554 valuelen != filter->pflt_strlen) 1555 return (!exclude); 1556 1557 if (filter->cmp_flags & FILT_FLAG_ICASE) 1558 s = strcasestr(value, filter->pflt_strval); 1559 else 1560 s = strstr(value, filter->pflt_strval); 1561 1562 /* 1563 * FILT_CMP_CONTAINS true if s 1564 * FILT_CMP_STARTS true if s && s == value 1565 * FILT_CMP_EQUAL true if s && s == value && 1566 * valuelen == filter->pflt_strlen 1567 * (and length match is checked 1568 * already) 1569 */ 1570 1571 switch (filter->cmp_type) { 1572 case FILT_CMP_STARTS: 1573 case FILT_CMP_EQUAL: 1574 if (s != value) 1575 return (!exclude); 1576 /* FALLTHROUGH */ 1577 case FILT_CMP_CONTAINS: 1578 if (s) 1579 return (exclude); 1580 else 1581 return (!exclude); 1582 break; 1583 default: 1584 /* unknown cmp_type */ 1585 break; 1586 } 1587 1588 return (-1); 1589} 1590 1591/* 1592 * Logs a message to the appropriate log files, users, etc. based on the 1593 * priority. Log messages are formatted according to RFC 3164 or 1594 * RFC 5424 in subsequent fprintlog_*() functions. 1595 */ 1596static void 1597logmsg(int pri, const struct logtime *timestamp, const char *hostname, 1598 const char *app_name, const char *procid, const char *msgid, 1599 const char *structured_data, const char *msg, int flags) 1600{ 1601 struct timeval tv; 1602 struct logtime timestamp_now; 1603 struct filed *f; 1604 size_t savedlen; 1605 int fac, prilev; 1606 char saved[MAXSVLINE], kernel_app_name[100]; 1607 1608 dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n", 1609 pri, flags, hostname, msg); 1610 1611 (void)gettimeofday(&tv, NULL); 1612 now = tv.tv_sec; 1613 if (timestamp == NULL) { 1614 localtime_r(&now, ×tamp_now.tm); 1615 timestamp_now.usec = tv.tv_usec; 1616 timestamp = ×tamp_now; 1617 } 1618 1619 /* extract facility and priority level */ 1620 if (flags & MARK) 1621 fac = LOG_NFACILITIES; 1622 else 1623 fac = LOG_FAC(pri); 1624 1625 /* Check maximum facility number. */ 1626 if (fac > LOG_NFACILITIES) 1627 return; 1628 1629 prilev = LOG_PRI(pri); 1630 1631 /* 1632 * Lookup kernel app name from log prefix if present. 1633 * This is only used for local program specification matching. 1634 */ 1635 if (flags & ISKERNEL) { 1636 size_t kernel_app_name_length; 1637 1638 parsemsg_rfc3164_get_app_name_procid(msg, 1639 &kernel_app_name_length, NULL, NULL); 1640 if (kernel_app_name_length != 0) { 1641 strlcpy(kernel_app_name, msg, 1642 MIN(sizeof(kernel_app_name), 1643 kernel_app_name_length + 1)); 1644 } else 1645 kernel_app_name[0] = '\0'; 1646 } 1647 1648 /* log the message to the particular outputs */ 1649 if (!Initialized) { 1650 consfile.f_lasttime = *timestamp; 1651 fprintlog_first(&consfile, hostname, app_name, procid, 1652 msgid, structured_data, msg, flags); 1653 return; 1654 } 1655 1656 /* 1657 * Store all of the fields of the message, except the timestamp, 1658 * in a single string. This string is used to detect duplicate 1659 * messages. 1660 */ 1661 assert(hostname != NULL); 1662 assert(msg != NULL); 1663 savedlen = snprintf(saved, sizeof(saved), 1664 "%d %s %s %s %s %s %s", pri, hostname, 1665 app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid, 1666 msgid == NULL ? "-" : msgid, 1667 structured_data == NULL ? "-" : structured_data, msg); 1668 1669 STAILQ_FOREACH(f, &fhead, next) { 1670 /* skip messages that are incorrect priority */ 1671 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev)) 1672 ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev)) 1673 ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev)) 1674 ) 1675 || f->f_pmask[fac] == INTERNAL_NOPRI) 1676 continue; 1677 1678 /* skip messages with the incorrect hostname */ 1679 if (skip_message(hostname, f->f_host, 0)) 1680 continue; 1681 1682 /* skip messages with the incorrect program name */ 1683 if (flags & ISKERNEL && kernel_app_name[0] != '\0') { 1684 if (skip_message(kernel_app_name, f->f_program, 1)) 1685 continue; 1686 } else if (skip_message(app_name == NULL ? "" : app_name, 1687 f->f_program, 1)) 1688 continue; 1689 1690 /* skip messages if a property does not match filter */ 1691 if (f->f_prop_filter != NULL && 1692 f->f_prop_filter->prop_type != FILT_PROP_NOOP) { 1693 switch (f->f_prop_filter->prop_type) { 1694 case FILT_PROP_MSG: 1695 if (evaluate_prop_filter(f->f_prop_filter, 1696 msg)) 1697 continue; 1698 break; 1699 case FILT_PROP_HOSTNAME: 1700 if (evaluate_prop_filter(f->f_prop_filter, 1701 hostname)) 1702 continue; 1703 break; 1704 case FILT_PROP_PROGNAME: 1705 if (evaluate_prop_filter(f->f_prop_filter, 1706 app_name == NULL ? "" : app_name)) 1707 continue; 1708 break; 1709 default: 1710 continue; 1711 } 1712 } 1713 1714 /* skip message to console if it has already been printed */ 1715 if (f->f_type == F_CONSOLE && (flags & IGN_CONS)) 1716 continue; 1717 1718 /* don't output marks to recently written files */ 1719 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2) 1720 continue; 1721 1722 /* 1723 * suppress duplicate lines to this file 1724 */ 1725 if (no_compress - (f->f_type != F_PIPE) < 1 && 1726 (flags & MARK) == 0 && savedlen == f->f_prevlen && 1727 strcmp(saved, f->f_prevline) == 0) { 1728 f->f_lasttime = *timestamp; 1729 f->f_prevcount++; 1730 dprintf("msg repeated %d times, %ld sec of %d\n", 1731 f->f_prevcount, (long)(now - f->f_time), 1732 repeatinterval[f->f_repeatcount]); 1733 /* 1734 * If domark would have logged this by now, 1735 * flush it now (so we don't hold isolated messages), 1736 * but back off so we'll flush less often 1737 * in the future. 1738 */ 1739 if (now > REPEATTIME(f)) { 1740 fprintlog_successive(f, flags); 1741 BACKOFF(f); 1742 } 1743 } else { 1744 /* new line, save it */ 1745 if (f->f_prevcount) 1746 fprintlog_successive(f, 0); 1747 f->f_repeatcount = 0; 1748 f->f_prevpri = pri; 1749 f->f_lasttime = *timestamp; 1750 static_assert(sizeof(f->f_prevline) == sizeof(saved), 1751 "Space to store saved line incorrect"); 1752 (void)strcpy(f->f_prevline, saved); 1753 f->f_prevlen = savedlen; 1754 fprintlog_first(f, hostname, app_name, procid, msgid, 1755 structured_data, msg, flags); 1756 } 1757 } 1758} 1759 1760static void 1761dofsync(void) 1762{ 1763 struct filed *f; 1764 1765 STAILQ_FOREACH(f, &fhead, next) { 1766 if (f->f_type == F_FILE && 1767 (f->f_flags & FFLAG_NEEDSYNC) != 0) { 1768 f->f_flags &= ~FFLAG_NEEDSYNC; 1769 (void)fsync(f->f_file); 1770 } 1771 } 1772 needdofsync = false; 1773} 1774 1775/* 1776 * List of iovecs to which entries can be appended. 1777 * Used for constructing the message to be logged. 1778 */ 1779struct iovlist { 1780 struct iovec iov[TTYMSG_IOV_MAX]; 1781 size_t iovcnt; 1782 size_t totalsize; 1783}; 1784 1785static void 1786iovlist_init(struct iovlist *il) 1787{ 1788 1789 il->iovcnt = 0; 1790 il->totalsize = 0; 1791} 1792 1793static void 1794iovlist_append(struct iovlist *il, const char *str) 1795{ 1796 size_t size; 1797 1798 /* Discard components if we've run out of iovecs. */ 1799 if (il->iovcnt < nitems(il->iov)) { 1800 size = strlen(str); 1801 il->iov[il->iovcnt++] = (struct iovec){ 1802 .iov_base = __DECONST(char *, str), 1803 .iov_len = size, 1804 }; 1805 il->totalsize += size; 1806 } 1807} 1808 1809#if defined(INET) || defined(INET6) 1810static void 1811iovlist_truncate(struct iovlist *il, size_t size) 1812{ 1813 struct iovec *last; 1814 size_t diff; 1815 1816 while (il->totalsize > size) { 1817 diff = il->totalsize - size; 1818 last = &il->iov[il->iovcnt - 1]; 1819 if (diff >= last->iov_len) { 1820 /* Remove the last iovec entirely. */ 1821 --il->iovcnt; 1822 il->totalsize -= last->iov_len; 1823 } else { 1824 /* Remove the last iovec partially. */ 1825 last->iov_len -= diff; 1826 il->totalsize -= diff; 1827 } 1828 } 1829} 1830#endif 1831 1832static void 1833fprintlog_write(struct filed *f, struct iovlist *il, int flags) 1834{ 1835 struct msghdr msghdr; 1836 struct addrinfo *r; 1837 struct socklist *sl; 1838 const char *msgret; 1839 ssize_t lsent; 1840 1841 switch (f->f_type) { 1842 case F_FORW: 1843 dprintf(" %s", f->fu_forw_hname); 1844 switch (f->fu_forw_addr->ai_family) { 1845#ifdef INET 1846 case AF_INET: 1847 dprintf(":%d\n", 1848 ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port)); 1849 break; 1850#endif 1851#ifdef INET6 1852 case AF_INET6: 1853 dprintf(":%d\n", 1854 ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port)); 1855 break; 1856#endif 1857 default: 1858 dprintf("\n"); 1859 } 1860 1861#if defined(INET) || defined(INET6) 1862 /* Truncate messages to maximum forward length. */ 1863 iovlist_truncate(il, MaxForwardLen); 1864#endif 1865 1866 lsent = 0; 1867 for (r = f->fu_forw_addr; r; r = r->ai_next) { 1868 memset(&msghdr, 0, sizeof(msghdr)); 1869 msghdr.msg_name = r->ai_addr; 1870 msghdr.msg_namelen = r->ai_addrlen; 1871 msghdr.msg_iov = il->iov; 1872 msghdr.msg_iovlen = il->iovcnt; 1873 STAILQ_FOREACH(sl, &shead, next) { 1874 if (sl->sl_socket < 0) 1875 continue; 1876 if (sl->sl_sa == NULL || 1877 sl->sl_family == AF_UNSPEC || 1878 sl->sl_family == AF_LOCAL) 1879 continue; 1880 lsent = sendmsg(sl->sl_socket, &msghdr, 0); 1881 if (lsent == (ssize_t)il->totalsize) 1882 break; 1883 } 1884 if (lsent == (ssize_t)il->totalsize && !send_to_all) 1885 break; 1886 } 1887 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize); 1888 if (lsent != (ssize_t)il->totalsize) { 1889 int e = errno; 1890 logerror("sendto"); 1891 errno = e; 1892 switch (errno) { 1893 case ENOBUFS: 1894 case ENETDOWN: 1895 case ENETUNREACH: 1896 case EHOSTUNREACH: 1897 case EHOSTDOWN: 1898 case EADDRNOTAVAIL: 1899 break; 1900 /* case EBADF: */ 1901 /* case EACCES: */ 1902 /* case ENOTSOCK: */ 1903 /* case EFAULT: */ 1904 /* case EMSGSIZE: */ 1905 /* case EAGAIN: */ 1906 /* case ENOBUFS: */ 1907 /* case ECONNREFUSED: */ 1908 default: 1909 dprintf("removing entry: errno=%d\n", e); 1910 f->f_type = F_UNUSED; 1911 break; 1912 } 1913 } 1914 break; 1915 1916 case F_FILE: 1917 dprintf(" %s\n", f->fu_fname); 1918 iovlist_append(il, "\n"); 1919 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1920 /* 1921 * If writev(2) fails for potentially transient errors 1922 * like the filesystem being full, ignore it. 1923 * Otherwise remove this logfile from the list. 1924 */ 1925 if (errno != ENOSPC) { 1926 int e = errno; 1927 close_filed(f); 1928 errno = e; 1929 logerror(f->fu_fname); 1930 } 1931 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) { 1932 f->f_flags |= FFLAG_NEEDSYNC; 1933 needdofsync = true; 1934 } 1935 break; 1936 1937 case F_PIPE: 1938 dprintf(" %s\n", f->fu_pipe_pname); 1939 iovlist_append(il, "\n"); 1940 if (f->fu_pipe_pd == -1) { 1941 if ((f->f_file = p_open(f->fu_pipe_pname, 1942 &f->fu_pipe_pd)) < 0) { 1943 logerror(f->fu_pipe_pname); 1944 break; 1945 } 1946 } 1947 if (writev(f->f_file, il->iov, il->iovcnt) < 0) { 1948 logerror(f->fu_pipe_pname); 1949 close_filed(f); 1950 } 1951 break; 1952 1953 case F_CONSOLE: 1954 if (flags & IGN_CONS) { 1955 dprintf(" (ignored)\n"); 1956 break; 1957 } 1958 /* FALLTHROUGH */ 1959 1960 case F_TTY: 1961 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname); 1962 iovlist_append(il, "\r\n"); 1963 errno = 0; /* ttymsg() only sometimes returns an errno */ 1964 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) { 1965 f->f_type = F_UNUSED; 1966 logerror(msgret); 1967 } 1968 break; 1969 1970 case F_USERS: 1971 case F_WALL: 1972 dprintf("\n"); 1973 iovlist_append(il, "\r\n"); 1974 wallmsg(f, il->iov, il->iovcnt); 1975 break; 1976 default: 1977 break; 1978 } 1979} 1980 1981static void 1982fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name, 1983 const char *procid, const char *msgid, const char *structured_data, 1984 const char *msg, int flags) 1985{ 1986 struct iovlist il; 1987 suseconds_t usec; 1988 int i; 1989 char timebuf[33], priority_number[5]; 1990 1991 iovlist_init(&il); 1992 if (f->f_type == F_WALL) 1993 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n"); 1994 iovlist_append(&il, "<"); 1995 snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri); 1996 iovlist_append(&il, priority_number); 1997 iovlist_append(&il, ">1 "); 1998 if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z", 1999 &f->f_lasttime.tm) == sizeof(timebuf) - 2) { 2000 /* Add colon to the time zone offset, which %z doesn't do. */ 2001 timebuf[32] = '\0'; 2002 timebuf[31] = timebuf[30]; 2003 timebuf[30] = timebuf[29]; 2004 timebuf[29] = ':'; 2005 2006 /* Overwrite space for microseconds with actual value. */ 2007 usec = f->f_lasttime.usec; 2008 for (i = 25; i >= 20; --i) { 2009 timebuf[i] = usec % 10 + '0'; 2010 usec /= 10; 2011 } 2012 iovlist_append(&il, timebuf); 2013 } else 2014 iovlist_append(&il, "-"); 2015 iovlist_append(&il, " "); 2016 iovlist_append(&il, hostname); 2017 iovlist_append(&il, " "); 2018 iovlist_append(&il, app_name == NULL ? "-" : app_name); 2019 iovlist_append(&il, " "); 2020 iovlist_append(&il, procid == NULL ? "-" : procid); 2021 iovlist_append(&il, " "); 2022 iovlist_append(&il, msgid == NULL ? "-" : msgid); 2023 iovlist_append(&il, " "); 2024 iovlist_append(&il, structured_data == NULL ? "-" : structured_data); 2025 iovlist_append(&il, " "); 2026 iovlist_append(&il, msg); 2027 2028 fprintlog_write(f, &il, flags); 2029} 2030 2031static void 2032fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name, 2033 const char *procid, const char *msg, int flags) 2034{ 2035 struct iovlist il; 2036 const CODE *c; 2037 int facility, priority; 2038 char timebuf[RFC3164_DATELEN + 1], facility_number[5], 2039 priority_number[5]; 2040 bool facility_found, priority_found; 2041 2042 if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT, 2043 &f->f_lasttime.tm) == 0) 2044 timebuf[0] = '\0'; 2045 2046 iovlist_init(&il); 2047 switch (f->f_type) { 2048 case F_FORW: 2049 /* Message forwarded over the network. */ 2050 iovlist_append(&il, "<"); 2051 snprintf(priority_number, sizeof(priority_number), "%d", 2052 f->f_prevpri); 2053 iovlist_append(&il, priority_number); 2054 iovlist_append(&il, ">"); 2055 iovlist_append(&il, timebuf); 2056 if (strcasecmp(hostname, LocalHostName) != 0) { 2057 iovlist_append(&il, " Forwarded from "); 2058 iovlist_append(&il, hostname); 2059 iovlist_append(&il, ":"); 2060 } 2061 iovlist_append(&il, " "); 2062 break; 2063 2064 case F_WALL: 2065 /* Message written to terminals. */ 2066 iovlist_append(&il, "\r\n\aMessage from syslogd@"); 2067 iovlist_append(&il, hostname); 2068 iovlist_append(&il, " at "); 2069 iovlist_append(&il, timebuf); 2070 iovlist_append(&il, " ...\r\n"); 2071 break; 2072 2073 default: 2074 /* Message written to files. */ 2075 iovlist_append(&il, timebuf); 2076 iovlist_append(&il, " "); 2077 2078 if (LogFacPri) { 2079 iovlist_append(&il, "<"); 2080 2081 facility = f->f_prevpri & LOG_FACMASK; 2082 facility_found = false; 2083 if (LogFacPri > 1) { 2084 for (c = facilitynames; c->c_name; c++) { 2085 if (c->c_val == facility) { 2086 iovlist_append(&il, c->c_name); 2087 facility_found = true; 2088 break; 2089 } 2090 } 2091 } 2092 if (!facility_found) { 2093 snprintf(facility_number, 2094 sizeof(facility_number), "%d", 2095 LOG_FAC(facility)); 2096 iovlist_append(&il, facility_number); 2097 } 2098 2099 iovlist_append(&il, "."); 2100 2101 priority = LOG_PRI(f->f_prevpri); 2102 priority_found = false; 2103 if (LogFacPri > 1) { 2104 for (c = prioritynames; c->c_name; c++) { 2105 if (c->c_val == priority) { 2106 iovlist_append(&il, c->c_name); 2107 priority_found = true; 2108 break; 2109 } 2110 } 2111 } 2112 if (!priority_found) { 2113 snprintf(priority_number, 2114 sizeof(priority_number), "%d", priority); 2115 iovlist_append(&il, priority_number); 2116 } 2117 2118 iovlist_append(&il, "> "); 2119 } 2120 2121 iovlist_append(&il, hostname); 2122 iovlist_append(&il, " "); 2123 break; 2124 } 2125 2126 /* Message body with application name and process ID prefixed. */ 2127 if (app_name != NULL) { 2128 iovlist_append(&il, app_name); 2129 if (procid != NULL) { 2130 iovlist_append(&il, "["); 2131 iovlist_append(&il, procid); 2132 iovlist_append(&il, "]"); 2133 } 2134 iovlist_append(&il, ": "); 2135 } 2136 iovlist_append(&il, msg); 2137 2138 fprintlog_write(f, &il, flags); 2139} 2140 2141static void 2142fprintlog_first(struct filed *f, const char *hostname, const char *app_name, 2143 const char *procid, const char *msgid __unused, 2144 const char *structured_data __unused, const char *msg, int flags) 2145{ 2146 2147 dprintf("Logging to %s", TypeNames[f->f_type]); 2148 f->f_time = now; 2149 f->f_prevcount = 0; 2150 if (f->f_type == F_UNUSED) { 2151 dprintf("\n"); 2152 return; 2153 } 2154 2155 if (RFC3164OutputFormat) 2156 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags); 2157 else 2158 fprintlog_rfc5424(f, hostname, app_name, procid, msgid, 2159 structured_data, msg, flags); 2160} 2161 2162/* 2163 * Prints a message to a log file that the previously logged message was 2164 * received multiple times. 2165 */ 2166static void 2167fprintlog_successive(struct filed *f, int flags) 2168{ 2169 char msg[100]; 2170 2171 assert(f->f_prevcount > 0); 2172 snprintf(msg, sizeof(msg), "last message repeated %d times", 2173 f->f_prevcount); 2174 fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg, 2175 flags); 2176} 2177 2178/* 2179 * WALLMSG -- Write a message to the world at large 2180 * 2181 * Write the specified message to either the entire 2182 * world, or a list of approved users. 2183 */ 2184static void 2185wallmsg(struct filed *f, struct iovec *iov, const int iovlen) 2186{ 2187 static int reenter; /* avoid calling ourselves */ 2188 struct utmpx *ut; 2189 int i; 2190 const char *p; 2191 2192 if (reenter++) 2193 return; 2194 setutxent(); 2195 /* NOSTRICT */ 2196 while ((ut = getutxent()) != NULL) { 2197 if (ut->ut_type != USER_PROCESS) 2198 continue; 2199 if (f->f_type == F_WALL) { 2200 if ((p = ttymsg(iov, iovlen, ut->ut_line, 2201 TTYMSGTIME)) != NULL) { 2202 errno = 0; /* already in msg */ 2203 logerror(p); 2204 } 2205 continue; 2206 } 2207 /* should we send the message to this user? */ 2208 for (i = 0; i < MAXUNAMES; i++) { 2209 if (!f->fu_uname[i][0]) 2210 break; 2211 if (!strcmp(f->fu_uname[i], ut->ut_user)) { 2212 if ((p = ttymsg_check(iov, iovlen, ut->ut_line, 2213 TTYMSGTIME)) != NULL) { 2214 errno = 0; /* already in msg */ 2215 logerror(p); 2216 } 2217 break; 2218 } 2219 } 2220 } 2221 endutxent(); 2222 reenter = 0; 2223} 2224 2225/* 2226 * Wrapper routine for ttymsg() that checks the terminal for messages enabled. 2227 */ 2228static const char * 2229ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout) 2230{ 2231 static char device[1024]; 2232 static char errbuf[1024]; 2233 struct stat sb; 2234 2235 (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line); 2236 2237 if (stat(device, &sb) < 0) { 2238 (void) snprintf(errbuf, sizeof(errbuf), 2239 "%s: %s", device, strerror(errno)); 2240 return (errbuf); 2241 } 2242 if ((sb.st_mode & S_IWGRP) == 0) 2243 /* Messages disabled. */ 2244 return (NULL); 2245 return (ttymsg(iov, iovcnt, line, tmout)); 2246} 2247 2248/* 2249 * Return a printable representation of a host address. 2250 */ 2251static const char * 2252cvthname(struct sockaddr *f) 2253{ 2254 int error, hl; 2255 static char hname[NI_MAXHOST], ip[NI_MAXHOST]; 2256 2257 dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len); 2258 error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0, 2259 NI_NUMERICHOST); 2260 if (error) { 2261 dprintf("Malformed from address %s\n", gai_strerror(error)); 2262 return ("???"); 2263 } 2264 dprintf("cvthname(%s)\n", ip); 2265 2266 if (!resolve) 2267 return (ip); 2268 2269 error = getnameinfo(f, f->sa_len, hname, sizeof(hname), 2270 NULL, 0, NI_NAMEREQD); 2271 if (error) { 2272 dprintf("Host name for your address (%s) unknown\n", ip); 2273 return (ip); 2274 } 2275 hl = strlen(hname); 2276 if (hl > 0 && hname[hl-1] == '.') 2277 hname[--hl] = '\0'; 2278 /* RFC 5424 prefers logging FQDNs. */ 2279 if (RFC3164OutputFormat) 2280 trimdomain(hname, hl); 2281 return (hname); 2282} 2283 2284/* 2285 * Print syslogd errors some place. 2286 */ 2287static void 2288logerror(const char *msg) 2289{ 2290 char buf[512]; 2291 static int recursed = 0; 2292 2293 /* If there's an error while trying to log an error, give up. */ 2294 if (recursed) 2295 return; 2296 recursed++; 2297 if (errno != 0) { 2298 (void)snprintf(buf, sizeof(buf), "%s: %s", msg, 2299 strerror(errno)); 2300 msg = buf; 2301 } 2302 errno = 0; 2303 dprintf("%s\n", msg); 2304 logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL, 2305 NULL, msg, 0); 2306 recursed--; 2307} 2308 2309static void 2310die(int signo) 2311{ 2312 struct filed *f; 2313 struct socklist *sl; 2314 char buf[100]; 2315 2316 STAILQ_FOREACH(f, &fhead, next) { 2317 /* flush any pending output */ 2318 if (f->f_prevcount) 2319 fprintlog_successive(f, 0); 2320 /* close our end of the pipe */ 2321 if (f->f_type == F_PIPE) 2322 close_filed(f); 2323 } 2324 if (signo) { 2325 dprintf("syslogd: exiting on signal %d\n", signo); 2326 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo); 2327 errno = 0; 2328 logerror(buf); 2329 } 2330 STAILQ_FOREACH(sl, &shead, next) { 2331 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) { 2332 if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) { 2333 dprintf("Failed to unlink %s: %s", sl->sl_name, 2334 strerror(errno)); 2335 } 2336 } 2337 } 2338 pidfile_remove(pfh); 2339 2340 exit(1); 2341} 2342 2343static int 2344configfiles(const struct dirent *dp) 2345{ 2346 const char *p; 2347 size_t ext_len; 2348 2349 if (dp->d_name[0] == '.') 2350 return (0); 2351 2352 ext_len = sizeof(include_ext) -1; 2353 2354 if (dp->d_namlen <= ext_len) 2355 return (0); 2356 2357 p = &dp->d_name[dp->d_namlen - ext_len]; 2358 if (strcmp(p, include_ext) != 0) 2359 return (0); 2360 2361 return (1); 2362} 2363 2364static void 2365parseconfigfile(FILE *cf, bool allow_includes) 2366{ 2367 FILE *cf2; 2368 struct dirent **ent; 2369 char cline[LINE_MAX]; 2370 char host[MAXHOSTNAMELEN]; 2371 char prog[LINE_MAX]; 2372 char file[MAXPATHLEN]; 2373 char pfilter[LINE_MAX]; 2374 char *p, *tmp; 2375 int i, nents; 2376 size_t include_len; 2377 2378 /* 2379 * Foreach line in the conf table, open that file. 2380 */ 2381 include_len = sizeof(include_str) - 1; 2382 (void)strlcpy(host, "*", sizeof(host)); 2383 (void)strlcpy(prog, "*", sizeof(prog)); 2384 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2385 while (fgets(cline, sizeof(cline), cf) != NULL) { 2386 /* 2387 * check for end-of-section, comments, strip off trailing 2388 * spaces and newline character. #!prog is treated specially: 2389 * following lines apply only to that program. 2390 */ 2391 for (p = cline; isspace(*p); ++p) 2392 continue; 2393 if (*p == '\0') 2394 continue; 2395 if (allow_includes && 2396 strncmp(p, include_str, include_len) == 0 && 2397 isspace(p[include_len])) { 2398 p += include_len; 2399 while (isspace(*p)) 2400 p++; 2401 tmp = p; 2402 while (*tmp != '\0' && !isspace(*tmp)) 2403 tmp++; 2404 *tmp = '\0'; 2405 dprintf("Trying to include files in '%s'\n", p); 2406 nents = scandir(p, &ent, configfiles, alphasort); 2407 if (nents == -1) { 2408 dprintf("Unable to open '%s': %s\n", p, 2409 strerror(errno)); 2410 continue; 2411 } 2412 for (i = 0; i < nents; i++) { 2413 if (snprintf(file, sizeof(file), "%s/%s", p, 2414 ent[i]->d_name) >= (int)sizeof(file)) { 2415 dprintf("ignoring path too long: " 2416 "'%s/%s'\n", p, ent[i]->d_name); 2417 free(ent[i]); 2418 continue; 2419 } 2420 free(ent[i]); 2421 cf2 = fopen(file, "r"); 2422 if (cf2 == NULL) 2423 continue; 2424 dprintf("reading %s\n", file); 2425 parseconfigfile(cf2, false); 2426 fclose(cf2); 2427 } 2428 free(ent); 2429 continue; 2430 } 2431 if (*p == '#') { 2432 p++; 2433 if (*p == '\0' || strchr("!+-:", *p) == NULL) 2434 continue; 2435 } 2436 if (*p == '+' || *p == '-') { 2437 host[0] = *p++; 2438 while (isspace(*p)) 2439 p++; 2440 if (*p == '\0' || *p == '*') { 2441 (void)strlcpy(host, "*", sizeof(host)); 2442 continue; 2443 } 2444 if (*p == '@') 2445 p = LocalHostName; 2446 for (i = 1; i < MAXHOSTNAMELEN - 1; i++) { 2447 if (!isalnum(*p) && *p != '.' && *p != '-' 2448 && *p != ',' && *p != ':' && *p != '%') 2449 break; 2450 host[i] = *p++; 2451 } 2452 host[i] = '\0'; 2453 continue; 2454 } 2455 if (*p == '!') { 2456 p++; 2457 while (isspace(*p)) 2458 p++; 2459 if (*p == '\0' || *p == '*') { 2460 (void)strlcpy(prog, "*", sizeof(prog)); 2461 continue; 2462 } 2463 for (i = 0; i < LINE_MAX - 1; i++) { 2464 if (!isprint(p[i]) || isspace(p[i])) 2465 break; 2466 prog[i] = p[i]; 2467 } 2468 prog[i] = '\0'; 2469 continue; 2470 } 2471 if (*p == ':') { 2472 p++; 2473 while (isspace(*p)) 2474 p++; 2475 if (*p == '\0' || *p == '*') { 2476 (void)strlcpy(pfilter, "*", sizeof(pfilter)); 2477 continue; 2478 } 2479 (void)strlcpy(pfilter, p, sizeof(pfilter)); 2480 continue; 2481 } 2482 for (p = cline + 1; *p != '\0'; p++) { 2483 if (*p != '#') 2484 continue; 2485 if (*(p - 1) == '\\') { 2486 strcpy(p - 1, p); 2487 p--; 2488 continue; 2489 } 2490 *p = '\0'; 2491 break; 2492 } 2493 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--) 2494 cline[i] = '\0'; 2495 cfline(cline, prog, host, pfilter); 2496 } 2497} 2498 2499static void 2500readconfigfile(const char *path) 2501{ 2502 FILE *cf; 2503 2504 if ((cf = fopen(path, "r")) != NULL) { 2505 parseconfigfile(cf, true); 2506 (void)fclose(cf); 2507 } else { 2508 dprintf("cannot open %s\n", ConfFile); 2509 cfline("*.ERR\t/dev/console", "*", "*", "*"); 2510 cfline("*.PANIC\t*", "*", "*", "*"); 2511 } 2512} 2513 2514/* 2515 * Close all open log files. 2516 */ 2517static void 2518closelogfiles(void) 2519{ 2520 struct filed *f; 2521 2522 while (!STAILQ_EMPTY(&fhead)) { 2523 f = STAILQ_FIRST(&fhead); 2524 STAILQ_REMOVE_HEAD(&fhead, next); 2525 2526 /* flush any pending output */ 2527 if (f->f_prevcount) 2528 fprintlog_successive(f, 0); 2529 2530 switch (f->f_type) { 2531 case F_FILE: 2532 case F_FORW: 2533 case F_CONSOLE: 2534 case F_TTY: 2535 case F_PIPE: 2536 close_filed(f); 2537 break; 2538 default: 2539 break; 2540 } 2541 2542 free(f->f_program); 2543 free(f->f_host); 2544 if (f->f_prop_filter) { 2545 switch (f->f_prop_filter->cmp_type) { 2546 case FILT_CMP_REGEX: 2547 regfree(f->f_prop_filter->pflt_re); 2548 free(f->f_prop_filter->pflt_re); 2549 break; 2550 case FILT_CMP_CONTAINS: 2551 case FILT_CMP_EQUAL: 2552 case FILT_CMP_STARTS: 2553 free(f->f_prop_filter->pflt_strval); 2554 break; 2555 } 2556 free(f->f_prop_filter); 2557 } 2558 free(f); 2559 } 2560} 2561 2562/* 2563 * INIT -- Initialize syslogd from configuration table 2564 */ 2565static void 2566init(bool reload) 2567{ 2568 int i; 2569 char *p; 2570 char oldLocalHostName[MAXHOSTNAMELEN]; 2571 char hostMsg[2*MAXHOSTNAMELEN+40]; 2572 char bootfileMsg[MAXLINE + 1]; 2573 2574 dprintf("init\n"); 2575 2576 /* 2577 * Load hostname (may have changed). 2578 */ 2579 if (reload) 2580 (void)strlcpy(oldLocalHostName, LocalHostName, 2581 sizeof(oldLocalHostName)); 2582 if (gethostname(LocalHostName, sizeof(LocalHostName))) 2583 err(EX_OSERR, "gethostname() failed"); 2584 if ((p = strchr(LocalHostName, '.')) != NULL) { 2585 /* RFC 5424 prefers logging FQDNs. */ 2586 if (RFC3164OutputFormat) 2587 *p = '\0'; 2588 LocalDomain = p + 1; 2589 } else { 2590 LocalDomain = ""; 2591 } 2592 2593 /* 2594 * Load / reload timezone data (in case it changed). 2595 * 2596 * Just calling tzset() again does not work, the timezone code 2597 * caches the result. However, by setting the TZ variable, one 2598 * can defeat the caching and have the timezone code really 2599 * reload the timezone data. Respect any initial setting of 2600 * TZ, in case the system is configured specially. 2601 */ 2602 dprintf("loading timezone data via tzset()\n"); 2603 if (getenv("TZ")) { 2604 tzset(); 2605 } else { 2606 setenv("TZ", ":/etc/localtime", 1); 2607 tzset(); 2608 unsetenv("TZ"); 2609 } 2610 2611 Initialized = false; 2612 closelogfiles(); 2613 readconfigfile(ConfFile); 2614 Initialized = true; 2615 2616 if (Debug) { 2617 struct filed *f; 2618 int port; 2619 2620 STAILQ_FOREACH(f, &fhead, next) { 2621 for (i = 0; i <= LOG_NFACILITIES; i++) 2622 if (f->f_pmask[i] == INTERNAL_NOPRI) 2623 printf("X "); 2624 else 2625 printf("%d ", f->f_pmask[i]); 2626 printf("%s: ", TypeNames[f->f_type]); 2627 switch (f->f_type) { 2628 case F_FILE: 2629 printf("%s", f->fu_fname); 2630 break; 2631 2632 case F_CONSOLE: 2633 case F_TTY: 2634 printf("%s%s", _PATH_DEV, f->fu_fname); 2635 break; 2636 2637 case F_FORW: 2638 switch (f->fu_forw_addr->ai_family) { 2639#ifdef INET 2640 case AF_INET: 2641 port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port); 2642 break; 2643#endif 2644#ifdef INET6 2645 case AF_INET6: 2646 port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port); 2647 break; 2648#endif 2649 default: 2650 port = 0; 2651 } 2652 if (port != 514) { 2653 printf("%s:%d", 2654 f->fu_forw_hname, port); 2655 } else { 2656 printf("%s", f->fu_forw_hname); 2657 } 2658 break; 2659 2660 case F_PIPE: 2661 printf("%s", f->fu_pipe_pname); 2662 break; 2663 2664 case F_USERS: 2665 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++) 2666 printf("%s, ", f->fu_uname[i]); 2667 break; 2668 default: 2669 break; 2670 } 2671 if (f->f_program) 2672 printf(" (%s)", f->f_program); 2673 printf("\n"); 2674 } 2675 } 2676 2677 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL, 2678 NULL, NULL, "restart", 0); 2679 dprintf("syslogd: restarted\n"); 2680 /* 2681 * Log a change in hostname, but only on reload. 2682 */ 2683 if (reload && strcmp(oldLocalHostName, LocalHostName) != 0) { 2684 (void)snprintf(hostMsg, sizeof(hostMsg), 2685 "hostname changed, \"%s\" to \"%s\"", 2686 oldLocalHostName, LocalHostName); 2687 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", 2688 NULL, NULL, NULL, hostMsg, 0); 2689 dprintf("%s\n", hostMsg); 2690 } 2691 /* 2692 * Log the kernel boot file if we aren't going to use it as 2693 * the prefix, and if this is *not* a reload. 2694 */ 2695 if (!reload && !use_bootfile) { 2696 (void)snprintf(bootfileMsg, sizeof(bootfileMsg), 2697 "kernel boot file is %s", bootfile); 2698 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd", 2699 NULL, NULL, NULL, bootfileMsg, 0); 2700 dprintf("%s\n", bootfileMsg); 2701 } 2702} 2703 2704/* 2705 * Compile property-based filter. 2706 */ 2707static struct prop_filter * 2708prop_filter_compile(const char *cfilter) 2709{ 2710 struct prop_filter *pfilter; 2711 char *filter, *filter_endpos, *filter_begpos, *p; 2712 char **ap, *argv[2] = {NULL, NULL}; 2713 int re_flags = REG_NOSUB; 2714 int escaped; 2715 2716 pfilter = calloc(1, sizeof(*pfilter)); 2717 if (pfilter == NULL) { 2718 logerror("pfilter calloc"); 2719 exit(1); 2720 } 2721 if (*cfilter == '*') { 2722 pfilter->prop_type = FILT_PROP_NOOP; 2723 return (pfilter); 2724 } 2725 filter = strdup(cfilter); 2726 if (filter == NULL) { 2727 logerror("strdup"); 2728 exit(1); 2729 } 2730 filter_begpos = filter; 2731 2732 /* 2733 * Here's some filter examples mentioned in syslog.conf(5) 2734 * 'msg, contains, ".*Deny.*"' 2735 * 'programname, regex, "^bird6?$"' 2736 * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"' 2737 */ 2738 2739 /* 2740 * Split filter into 3 parts: property name (argv[0]), 2741 * cmp type (argv[1]) and lvalue for comparison (filter). 2742 */ 2743 for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) { 2744 if (**ap != '\0') 2745 if (++ap >= &argv[2]) 2746 break; 2747 } 2748 2749 if (argv[0] == NULL || argv[1] == NULL) { 2750 logerror("filter parse error"); 2751 goto error; 2752 } 2753 2754 /* fill in prop_type */ 2755 if (strcasecmp(argv[0], "msg") == 0) 2756 pfilter->prop_type = FILT_PROP_MSG; 2757 else if (strcasecmp(argv[0], "hostname") == 0) 2758 pfilter->prop_type = FILT_PROP_HOSTNAME; 2759 else if (strcasecmp(argv[0], "source") == 0) 2760 pfilter->prop_type = FILT_PROP_HOSTNAME; 2761 else if (strcasecmp(argv[0], "programname") == 0) 2762 pfilter->prop_type = FILT_PROP_PROGNAME; 2763 else { 2764 logerror("unknown property"); 2765 goto error; 2766 } 2767 2768 /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */ 2769 if (*argv[1] == '!') { 2770 pfilter->cmp_flags |= FILT_FLAG_EXCLUDE; 2771 argv[1]++; 2772 } 2773 if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) { 2774 pfilter->cmp_flags |= FILT_FLAG_ICASE; 2775 argv[1] += sizeof("icase_") - 1; 2776 } 2777 2778 /* fill in cmp_type */ 2779 if (strcasecmp(argv[1], "contains") == 0) 2780 pfilter->cmp_type = FILT_CMP_CONTAINS; 2781 else if (strcasecmp(argv[1], "isequal") == 0) 2782 pfilter->cmp_type = FILT_CMP_EQUAL; 2783 else if (strcasecmp(argv[1], "startswith") == 0) 2784 pfilter->cmp_type = FILT_CMP_STARTS; 2785 else if (strcasecmp(argv[1], "regex") == 0) 2786 pfilter->cmp_type = FILT_CMP_REGEX; 2787 else if (strcasecmp(argv[1], "ereregex") == 0) { 2788 pfilter->cmp_type = FILT_CMP_REGEX; 2789 re_flags |= REG_EXTENDED; 2790 } else { 2791 logerror("unknown cmp function"); 2792 goto error; 2793 } 2794 2795 /* 2796 * Handle filter value 2797 */ 2798 2799 /* ' ".*Deny.*"' */ 2800 /* remove leading whitespace and check for '"' next character */ 2801 filter += strspn(filter, ", \t\n"); 2802 if (*filter != '"' || strlen(filter) < 3) { 2803 logerror("property value parse error"); 2804 goto error; 2805 } 2806 filter++; 2807 2808 /* '.*Deny.*"' */ 2809 /* process possible backslash (\") escaping */ 2810 escaped = 0; 2811 filter_endpos = filter; 2812 for (p = filter; *p != '\0'; p++) { 2813 if (*p == '\\' && !escaped) { 2814 escaped = 1; 2815 /* do not shift filter_endpos */ 2816 continue; 2817 } 2818 if (*p == '"' && !escaped) { 2819 p++; 2820 break; 2821 } 2822 /* we've seen some esc symbols, need to compress the line */ 2823 if (filter_endpos != p) 2824 *filter_endpos = *p; 2825 2826 filter_endpos++; 2827 escaped = 0; 2828 } 2829 2830 *filter_endpos = '\0'; 2831 /* '.*Deny.*' */ 2832 2833 /* We should not have anything but whitespace left after closing '"' */ 2834 if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) { 2835 logerror("property value parse error"); 2836 goto error; 2837 } 2838 2839 if (pfilter->cmp_type == FILT_CMP_REGEX) { 2840 pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re)); 2841 if (pfilter->pflt_re == NULL) { 2842 logerror("RE calloc() error"); 2843 goto error; 2844 } 2845 if (pfilter->cmp_flags & FILT_FLAG_ICASE) 2846 re_flags |= REG_ICASE; 2847 if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) { 2848 logerror("RE compilation error"); 2849 goto error; 2850 } 2851 } else { 2852 pfilter->pflt_strval = strdup(filter); 2853 pfilter->pflt_strlen = strlen(filter); 2854 } 2855 2856 free(filter_begpos); 2857 return (pfilter); 2858error: 2859 free(filter_begpos); 2860 free(pfilter->pflt_re); 2861 free(pfilter); 2862 return (NULL); 2863} 2864 2865static const char * 2866parse_selector(const char *p, struct filed *f) 2867{ 2868 int i, pri; 2869 int pri_done = 0, pri_cmp = 0, pri_invert = 0; 2870 char *bp, buf[LINE_MAX], ebuf[100]; 2871 const char *q; 2872 2873 /* find the end of this facility name list */ 2874 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';) 2875 continue; 2876 2877 /* get the priority comparison */ 2878 if (*q == '!') { 2879 pri_invert = 1; 2880 q++; 2881 } 2882 while (!pri_done) { 2883 switch (*q) { 2884 case '<': 2885 pri_cmp |= PRI_LT; 2886 q++; 2887 break; 2888 case '=': 2889 pri_cmp |= PRI_EQ; 2890 q++; 2891 break; 2892 case '>': 2893 pri_cmp |= PRI_GT; 2894 q++; 2895 break; 2896 default: 2897 pri_done++; 2898 break; 2899 } 2900 } 2901 2902 /* collect priority name */ 2903 for (bp = buf; *q != '\0' && !strchr("\t,; ", *q); ) 2904 *bp++ = *q++; 2905 *bp = '\0'; 2906 2907 /* skip cruft */ 2908 while (strchr(",;", *q)) 2909 q++; 2910 2911 /* decode priority name */ 2912 if (*buf == '*') { 2913 pri = LOG_PRIMASK; 2914 pri_cmp = PRI_LT | PRI_EQ | PRI_GT; 2915 } else { 2916 /* Ignore trailing spaces. */ 2917 for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--) 2918 buf[i] = '\0'; 2919 2920 pri = decode(buf, prioritynames); 2921 if (pri < 0) { 2922 errno = 0; 2923 (void)snprintf(ebuf, sizeof(ebuf), 2924 "unknown priority name \"%s\"", buf); 2925 logerror(ebuf); 2926 free(f); 2927 return (NULL); 2928 } 2929 } 2930 if (!pri_cmp) 2931 pri_cmp = UniquePriority ? PRI_EQ : (PRI_EQ | PRI_GT); 2932 if (pri_invert) 2933 pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT; 2934 2935 /* scan facilities */ 2936 while (*p != '\0' && !strchr("\t.; ", *p)) { 2937 for (bp = buf; *p != '\0' && !strchr("\t,;. ", *p); ) 2938 *bp++ = *p++; 2939 *bp = '\0'; 2940 2941 if (*buf == '*') { 2942 for (i = 0; i < LOG_NFACILITIES; i++) { 2943 f->f_pmask[i] = pri; 2944 f->f_pcmp[i] = pri_cmp; 2945 } 2946 } else { 2947 i = decode(buf, facilitynames); 2948 if (i < 0) { 2949 errno = 0; 2950 (void)snprintf(ebuf, sizeof(ebuf), 2951 "unknown facility name \"%s\"", 2952 buf); 2953 logerror(ebuf); 2954 free(f); 2955 return (NULL); 2956 } 2957 f->f_pmask[i >> 3] = pri; 2958 f->f_pcmp[i >> 3] = pri_cmp; 2959 } 2960 while (*p == ',' || *p == ' ') 2961 p++; 2962 } 2963 return (q); 2964} 2965 2966static void 2967parse_action(const char *p, struct filed *f) 2968{ 2969 struct addrinfo hints, *res; 2970 int error, i; 2971 const char *q; 2972 bool syncfile; 2973 2974 if (*p == '-') { 2975 syncfile = false; 2976 p++; 2977 } else 2978 syncfile = true; 2979 2980 switch (*p) { 2981 case '@': 2982 { 2983 char *tp; 2984 char endkey = ':'; 2985 /* 2986 * scan forward to see if there is a port defined. 2987 * so we can't use strlcpy.. 2988 */ 2989 i = sizeof(f->fu_forw_hname); 2990 tp = f->fu_forw_hname; 2991 p++; 2992 2993 /* 2994 * an ipv6 address should start with a '[' in that case 2995 * we should scan for a ']' 2996 */ 2997 if (*p == '[') { 2998 p++; 2999 endkey = ']'; 3000 } 3001 while (*p && (*p != endkey) && (i-- > 0)) { 3002 *tp++ = *p++; 3003 } 3004 if (endkey == ']' && *p == endkey) 3005 p++; 3006 *tp = '\0'; 3007 } 3008 /* See if we copied a domain and have a port */ 3009 if (*p == ':') 3010 p++; 3011 else 3012 p = NULL; 3013 3014 hints = (struct addrinfo){ 3015 .ai_family = family, 3016 .ai_socktype = SOCK_DGRAM 3017 }; 3018 error = getaddrinfo(f->fu_forw_hname, 3019 p ? p : "syslog", &hints, &res); 3020 if (error) { 3021 logerror(gai_strerror(error)); 3022 break; 3023 } 3024 f->fu_forw_addr = res; 3025 f->f_type = F_FORW; 3026 break; 3027 3028 case '/': 3029 if ((f->f_file = open(p, logflags, 0600)) < 0) { 3030 f->f_type = F_UNUSED; 3031 logerror(p); 3032 break; 3033 } 3034 if (syncfile) 3035 f->f_flags |= FFLAG_SYNC; 3036 if (isatty(f->f_file)) { 3037 if (strcmp(p, _PATH_CONSOLE) == 0) 3038 f->f_type = F_CONSOLE; 3039 else 3040 f->f_type = F_TTY; 3041 (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1, 3042 sizeof(f->fu_fname)); 3043 } else { 3044 (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname)); 3045 f->f_type = F_FILE; 3046 } 3047 break; 3048 3049 case '|': 3050 f->fu_pipe_pd = -1; 3051 (void)strlcpy(f->fu_pipe_pname, p + 1, 3052 sizeof(f->fu_pipe_pname)); 3053 f->f_type = F_PIPE; 3054 break; 3055 3056 case '*': 3057 f->f_type = F_WALL; 3058 break; 3059 3060 default: 3061 for (i = 0; i < MAXUNAMES && *p; i++) { 3062 for (q = p; *q && *q != ','; ) 3063 q++; 3064 (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1); 3065 if ((q - p) >= MAXLOGNAME) 3066 f->fu_uname[i][MAXLOGNAME - 1] = '\0'; 3067 else 3068 f->fu_uname[i][q - p] = '\0'; 3069 while (*q == ',' || *q == ' ') 3070 q++; 3071 p = q; 3072 } 3073 f->f_type = F_USERS; 3074 break; 3075 } 3076} 3077 3078/* 3079 * Crack a configuration file line 3080 */ 3081static void 3082cfline(const char *line, const char *prog, const char *host, 3083 const char *pfilter) 3084{ 3085 struct filed *f; 3086 const char *p; 3087 3088 dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog, 3089 host, pfilter); 3090 3091 f = calloc(1, sizeof(*f)); 3092 if (f == NULL) { 3093 logerror("malloc"); 3094 exit(1); 3095 } 3096 errno = 0; /* keep strerror() stuff out of logerror messages */ 3097 3098 for (int i = 0; i <= LOG_NFACILITIES; i++) 3099 f->f_pmask[i] = INTERNAL_NOPRI; 3100 3101 /* save hostname if any */ 3102 if (host && *host == '*') 3103 host = NULL; 3104 if (host) { 3105 int hl; 3106 3107 f->f_host = strdup(host); 3108 if (f->f_host == NULL) { 3109 logerror("strdup"); 3110 exit(1); 3111 } 3112 hl = strlen(f->f_host); 3113 if (hl > 0 && f->f_host[hl-1] == '.') 3114 f->f_host[--hl] = '\0'; 3115 /* RFC 5424 prefers logging FQDNs. */ 3116 if (RFC3164OutputFormat) 3117 trimdomain(f->f_host, hl); 3118 } 3119 3120 /* save program name if any */ 3121 if (prog && *prog == '*') 3122 prog = NULL; 3123 if (prog) { 3124 f->f_program = strdup(prog); 3125 if (f->f_program == NULL) { 3126 logerror("strdup"); 3127 exit(1); 3128 } 3129 } 3130 3131 if (pfilter) { 3132 f->f_prop_filter = prop_filter_compile(pfilter); 3133 if (f->f_prop_filter == NULL) { 3134 logerror("filter compile error"); 3135 exit(1); 3136 } 3137 } 3138 3139 /* scan through the list of selectors */ 3140 for (p = line; *p != '\0' && *p != '\t' && *p != ' ';) 3141 p = parse_selector(p, f); 3142 3143 /* skip to action part */ 3144 while (*p == '\t' || *p == ' ') 3145 p++; 3146 parse_action(p, f); 3147 3148 STAILQ_INSERT_TAIL(&fhead, f, next); 3149} 3150 3151/* 3152 * Decode a symbolic name to a numeric value 3153 */ 3154static int 3155decode(const char *name, const CODE *codetab) 3156{ 3157 const CODE *c; 3158 char *p, buf[40]; 3159 3160 if (isdigit(*name)) 3161 return (atoi(name)); 3162 3163 for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) { 3164 if (isupper(*name)) 3165 *p = tolower(*name); 3166 else 3167 *p = *name; 3168 } 3169 *p = '\0'; 3170 for (c = codetab; c->c_name; c++) 3171 if (!strcmp(buf, c->c_name)) 3172 return (c->c_val); 3173 3174 return (-1); 3175} 3176 3177static void 3178markit(void) 3179{ 3180 struct filed *f; 3181 struct deadq_entry *dq, *dq0; 3182 3183 now = time((time_t *)NULL); 3184 MarkSeq += TIMERINTVL; 3185 if (MarkSeq >= MarkInterval) { 3186 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL, 3187 "-- MARK --", MARK); 3188 MarkSeq = 0; 3189 } 3190 3191 STAILQ_FOREACH(f, &fhead, next) { 3192 if (f->f_prevcount && now >= REPEATTIME(f)) { 3193 dprintf("flush %s: repeated %d times, %d sec.\n", 3194 TypeNames[f->f_type], f->f_prevcount, 3195 repeatinterval[f->f_repeatcount]); 3196 fprintlog_successive(f, 0); 3197 BACKOFF(f); 3198 } 3199 } 3200 3201 /* Walk the dead queue, and see if we should signal somebody. */ 3202 TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) { 3203 switch (dq->dq_timeout) { 3204 case 0: 3205 /* Already signalled once, try harder now. */ 3206 (void)pdkill(dq->dq_procdesc, SIGKILL); 3207 (void)deadq_remove(dq); 3208 break; 3209 3210 case 1: 3211 if (pdkill(dq->dq_procdesc, SIGTERM) != 0) 3212 (void)deadq_remove(dq); 3213 else 3214 dq->dq_timeout--; 3215 break; 3216 default: 3217 dq->dq_timeout--; 3218 } 3219 } 3220 (void)alarm(TIMERINTVL); 3221} 3222 3223/* 3224 * fork off and become a daemon, but wait for the child to come online 3225 * before returning to the parent, or we get disk thrashing at boot etc. 3226 */ 3227static int 3228waitdaemon(int maxwait) 3229{ 3230 struct pollfd pollfd; 3231 int events, pipefd[2], status; 3232 pid_t pid; 3233 3234 if (pipe(pipefd) == -1) { 3235 warn("failed to daemonize, pipe"); 3236 die(0); 3237 } 3238 pid = fork(); 3239 if (pid == -1) { 3240 warn("failed to daemonize, fork"); 3241 die(0); 3242 } else if (pid > 0) { 3243 close(pipefd[1]); 3244 pollfd.fd = pipefd[0]; 3245 pollfd.events = POLLHUP; 3246 events = poll(&pollfd, 1, maxwait * 1000); 3247 if (events == -1) 3248 err(1, "failed to daemonize, poll"); 3249 else if (events == 0) 3250 errx(1, "timed out waiting for child"); 3251 if (waitpid(pid, &status, WNOHANG) > 0) { 3252 if (WIFEXITED(status)) 3253 errx(1, "child pid %d exited with return code %d", 3254 pid, WEXITSTATUS(status)); 3255 if (WIFSIGNALED(status)) 3256 errx(1, "child pid %d exited on signal %d%s", 3257 pid, WTERMSIG(status), 3258 WCOREDUMP(status) ? " (core dumped)" : ""); 3259 } 3260 exit(0); 3261 } 3262 close(pipefd[0]); 3263 if (setsid() == -1) { 3264 warn("failed to daemonize, setsid"); 3265 die(0); 3266 } 3267 (void)chdir("/"); 3268 (void)dup2(nulldesc, STDIN_FILENO); 3269 (void)dup2(nulldesc, STDOUT_FILENO); 3270 (void)dup2(nulldesc, STDERR_FILENO); 3271 return (pipefd[1]); 3272} 3273 3274/* 3275 * Add `s' to the list of allowable peer addresses to accept messages 3276 * from. 3277 * 3278 * `s' is a string in the form: 3279 * 3280 * [*]domainname[:{servicename|portnumber|*}] 3281 * 3282 * or 3283 * 3284 * netaddr/maskbits[:{servicename|portnumber|*}] 3285 * 3286 * Returns false on error, true if the argument was valid. 3287 */ 3288static bool 3289#if defined(INET) || defined(INET6) 3290allowaddr(char *s) 3291#else 3292allowaddr(char *s __unused) 3293#endif 3294{ 3295#if defined(INET) || defined(INET6) 3296 char *cp1, *cp2; 3297 struct allowedpeer *ap; 3298 struct servent *se; 3299 int masklen = -1; 3300 struct addrinfo hints, *res = NULL; 3301#ifdef INET 3302 in_addr_t *addrp, *maskp; 3303#endif 3304#ifdef INET6 3305 uint32_t *addr6p, *mask6p; 3306#endif 3307 char ip[NI_MAXHOST]; 3308 3309 ap = calloc(1, sizeof(*ap)); 3310 if (ap == NULL) 3311 err(1, "malloc failed"); 3312 3313#ifdef INET6 3314 if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL) 3315#endif 3316 cp1 = s; 3317 if ((cp1 = strrchr(cp1, ':'))) { 3318 /* service/port provided */ 3319 *cp1++ = '\0'; 3320 if (strlen(cp1) == 1 && *cp1 == '*') 3321 /* any port allowed */ 3322 ap->port = 0; 3323 else if ((se = getservbyname(cp1, "udp"))) { 3324 ap->port = ntohs(se->s_port); 3325 } else { 3326 ap->port = strtol(cp1, &cp2, 0); 3327 /* port not numeric */ 3328 if (*cp2 != '\0') 3329 goto err; 3330 } 3331 } else { 3332 if ((se = getservbyname("syslog", "udp"))) 3333 ap->port = ntohs(se->s_port); 3334 else 3335 /* sanity, should not happen */ 3336 ap->port = 514; 3337 } 3338 3339 if ((cp1 = strchr(s, '/')) != NULL && 3340 strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) { 3341 *cp1 = '\0'; 3342 if ((masklen = atoi(cp1 + 1)) < 0) 3343 goto err; 3344 } 3345#ifdef INET6 3346 if (*s == '[') { 3347 cp2 = s + strlen(s) - 1; 3348 if (*cp2 == ']') { 3349 ++s; 3350 *cp2 = '\0'; 3351 } else { 3352 cp2 = NULL; 3353 } 3354 } else { 3355 cp2 = NULL; 3356 } 3357#endif 3358 hints = (struct addrinfo){ 3359 .ai_family = PF_UNSPEC, 3360 .ai_socktype = SOCK_DGRAM, 3361 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3362 }; 3363 if (getaddrinfo(s, NULL, &hints, &res) == 0) { 3364 ap->isnumeric = true; 3365 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen); 3366 ap->a_mask = (struct sockaddr_storage){ 3367 .ss_family = res->ai_family, 3368 .ss_len = res->ai_addrlen 3369 }; 3370 switch (res->ai_family) { 3371#ifdef INET 3372 case AF_INET: 3373 maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr; 3374 addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr; 3375 if (masklen < 0) { 3376 /* use default netmask */ 3377 if (IN_CLASSA(ntohl(*addrp))) 3378 *maskp = htonl(IN_CLASSA_NET); 3379 else if (IN_CLASSB(ntohl(*addrp))) 3380 *maskp = htonl(IN_CLASSB_NET); 3381 else 3382 *maskp = htonl(IN_CLASSC_NET); 3383 } else if (masklen == 0) { 3384 *maskp = 0; 3385 } else if (masklen <= 32) { 3386 /* convert masklen to netmask */ 3387 *maskp = htonl(~((1 << (32 - masklen)) - 1)); 3388 } else { 3389 goto err; 3390 } 3391 /* Lose any host bits in the network number. */ 3392 *addrp &= *maskp; 3393 break; 3394#endif 3395#ifdef INET6 3396 case AF_INET6: 3397 if (masklen > 128) 3398 goto err; 3399 3400 if (masklen < 0) 3401 masklen = 128; 3402 mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0]; 3403 addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0]; 3404 /* convert masklen to netmask */ 3405 while (masklen > 0) { 3406 if (masklen < 32) { 3407 *mask6p = 3408 htonl(~(0xffffffff >> masklen)); 3409 *addr6p &= *mask6p; 3410 break; 3411 } else { 3412 *mask6p++ = 0xffffffff; 3413 addr6p++; 3414 masklen -= 32; 3415 } 3416 } 3417 break; 3418#endif 3419 default: 3420 goto err; 3421 } 3422 freeaddrinfo(res); 3423 } else { 3424 /* arg `s' is domain name */ 3425 ap->isnumeric = false; 3426 ap->a_name = s; 3427 if (cp1) 3428 *cp1 = '/'; 3429#ifdef INET6 3430 if (cp2) { 3431 *cp2 = ']'; 3432 --s; 3433 } 3434#endif 3435 } 3436 STAILQ_INSERT_TAIL(&aphead, ap, next); 3437 3438 if (Debug) { 3439 printf("allowaddr: rule "); 3440 if (ap->isnumeric) { 3441 printf("numeric, "); 3442 getnameinfo(sstosa(&ap->a_addr), 3443 (sstosa(&ap->a_addr))->sa_len, 3444 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3445 printf("addr = %s, ", ip); 3446 getnameinfo(sstosa(&ap->a_mask), 3447 (sstosa(&ap->a_mask))->sa_len, 3448 ip, sizeof(ip), NULL, 0, NI_NUMERICHOST); 3449 printf("mask = %s; ", ip); 3450 } else { 3451 printf("domainname = %s; ", ap->a_name); 3452 } 3453 printf("port = %d\n", ap->port); 3454 } 3455 3456 return (true); 3457err: 3458 if (res != NULL) 3459 freeaddrinfo(res); 3460 free(ap); 3461#endif 3462 return (false); 3463} 3464 3465/* 3466 * Validate that the remote peer has permission to log to us. 3467 */ 3468static bool 3469validate(struct sockaddr *sa, const char *hname) 3470{ 3471 int i; 3472 char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV]; 3473 struct allowedpeer *ap; 3474#ifdef INET 3475 struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL; 3476#endif 3477#ifdef INET6 3478 struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL; 3479#endif 3480 struct addrinfo hints, *res; 3481 u_short sport; 3482 3483 /* traditional behaviour, allow everything */ 3484 if (STAILQ_EMPTY(&aphead)) 3485 return (true); 3486 3487 (void)strlcpy(name, hname, sizeof(name)); 3488 hints = (struct addrinfo){ 3489 .ai_family = PF_UNSPEC, 3490 .ai_socktype = SOCK_DGRAM, 3491 .ai_flags = AI_PASSIVE | AI_NUMERICHOST 3492 }; 3493 if (getaddrinfo(name, NULL, &hints, &res) == 0) 3494 freeaddrinfo(res); 3495 else if (strchr(name, '.') == NULL) { 3496 strlcat(name, ".", sizeof(name)); 3497 strlcat(name, LocalDomain, sizeof(name)); 3498 } 3499 if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port), 3500 NI_NUMERICHOST | NI_NUMERICSERV) != 0) 3501 return (false); /* for safety, should not occur */ 3502 dprintf("validate: dgram from IP %s, port %s, name %s;\n", 3503 ip, port, name); 3504 sport = atoi(port); 3505 3506 /* now, walk down the list */ 3507 i = 0; 3508 STAILQ_FOREACH(ap, &aphead, next) { 3509 i++; 3510 if (ap->port != 0 && ap->port != sport) { 3511 dprintf("rejected in rule %d due to port mismatch.\n", 3512 i); 3513 continue; 3514 } 3515 3516 if (ap->isnumeric) { 3517 if (ap->a_addr.ss_family != sa->sa_family) { 3518 dprintf("rejected in rule %d due to address family mismatch.\n", i); 3519 continue; 3520 } 3521#ifdef INET 3522 else if (ap->a_addr.ss_family == AF_INET) { 3523 sin4 = satosin(sa); 3524 a4p = satosin(&ap->a_addr); 3525 m4p = satosin(&ap->a_mask); 3526 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr) 3527 != a4p->sin_addr.s_addr) { 3528 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3529 continue; 3530 } 3531 } 3532#endif 3533#ifdef INET6 3534 else if (ap->a_addr.ss_family == AF_INET6) { 3535 sin6 = satosin6(sa); 3536 a6p = satosin6(&ap->a_addr); 3537 m6p = satosin6(&ap->a_mask); 3538 if (a6p->sin6_scope_id != 0 && 3539 sin6->sin6_scope_id != a6p->sin6_scope_id) { 3540 dprintf("rejected in rule %d due to scope mismatch.\n", i); 3541 continue; 3542 } 3543 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr, 3544 &a6p->sin6_addr, &m6p->sin6_addr)) { 3545 dprintf("rejected in rule %d due to IP mismatch.\n", i); 3546 continue; 3547 } 3548 } 3549#endif 3550 else 3551 continue; 3552 } else { 3553 if (fnmatch(ap->a_name, name, FNM_NOESCAPE) == 3554 FNM_NOMATCH) { 3555 dprintf("rejected in rule %d due to name " 3556 "mismatch.\n", i); 3557 continue; 3558 } 3559 } 3560 dprintf("accepted in rule %d.\n", i); 3561 return (true); /* hooray! */ 3562 } 3563 return (false); 3564} 3565 3566/* 3567 * Fairly similar to popen(3), but returns an open descriptor, as 3568 * opposed to a FILE *. 3569 */ 3570static int 3571p_open(const char *prog, int *rpd) 3572{ 3573 struct sigaction act = { }; 3574 int pfd[2], pd; 3575 pid_t pid; 3576 char *argv[4]; /* sh -c cmd NULL */ 3577 char errmsg[200]; 3578 3579 if (pipe(pfd) == -1) 3580 return (-1); 3581 3582 switch ((pid = pdfork(&pd, PD_CLOEXEC))) { 3583 case -1: 3584 return (-1); 3585 3586 case 0: 3587 (void)setsid(); /* Avoid catching SIGHUPs. */ 3588 argv[0] = strdup("sh"); 3589 argv[1] = strdup("-c"); 3590 argv[2] = strdup(prog); 3591 argv[3] = NULL; 3592 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) { 3593 logerror("strdup"); 3594 exit(1); 3595 } 3596 3597 alarm(0); 3598 act.sa_handler = SIG_DFL; 3599 for (size_t i = 0; i < nitems(sigcatch); ++i) { 3600 if (sigaction(sigcatch[i], &act, NULL) == -1) { 3601 logerror("sigaction"); 3602 exit(1); 3603 } 3604 } 3605 3606 dup2(pfd[0], STDIN_FILENO); 3607 dup2(nulldesc, STDOUT_FILENO); 3608 dup2(nulldesc, STDERR_FILENO); 3609 closefrom(STDERR_FILENO + 1); 3610 3611 (void)execvp(_PATH_BSHELL, argv); 3612 _exit(255); 3613 } 3614 close(pfd[0]); 3615 /* 3616 * Avoid blocking on a hung pipe. With O_NONBLOCK, we are 3617 * supposed to get an EWOULDBLOCK on writev(2), which is 3618 * caught by the logic above anyway, which will in turn close 3619 * the pipe, and fork a new logging subprocess if necessary. 3620 * The stale subprocess will be killed some time later unless 3621 * it terminated itself due to closing its input pipe (so we 3622 * get rid of really dead puppies). 3623 */ 3624 if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) { 3625 /* This is bad. */ 3626 (void)snprintf(errmsg, sizeof(errmsg), 3627 "Warning: cannot change pipe to PID %d to " 3628 "non-blocking behaviour.", 3629 (int)pid); 3630 logerror(errmsg); 3631 } 3632 *rpd = pd; 3633 return (pfd[1]); 3634} 3635 3636static void 3637deadq_enter(int pd) 3638{ 3639 struct deadq_entry *dq; 3640 3641 if (pd == -1) 3642 return; 3643 3644 dq = malloc(sizeof(*dq)); 3645 if (dq == NULL) { 3646 logerror("malloc"); 3647 exit(1); 3648 } 3649 3650 dq->dq_procdesc = pd; 3651 dq->dq_timeout = DQ_TIMO_INIT; 3652 TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries); 3653} 3654 3655static void 3656deadq_remove(struct deadq_entry *dq) 3657{ 3658 TAILQ_REMOVE(&deadq_head, dq, dq_entries); 3659 close(dq->dq_procdesc); 3660 free(dq); 3661} 3662 3663static struct socklist * 3664socksetup(struct addrinfo *ai, const char *name, mode_t mode) 3665{ 3666 struct socklist *sl; 3667 int (*sl_recv)(struct socklist *); 3668 int s, optval = 1; 3669 3670 if (ai->ai_family != AF_LOCAL && SecureMode > 1) { 3671 /* Only AF_LOCAL in secure mode. */ 3672 return (NULL); 3673 } 3674 if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL && 3675 ai->ai_family != family) 3676 return (NULL); 3677 3678 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); 3679 if (s < 0) { 3680 logerror("socket"); 3681 return (NULL); 3682 } 3683#ifdef INET6 3684 if (ai->ai_family == AF_INET6) { 3685 if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval, 3686 sizeof(int)) < 0) { 3687 logerror("setsockopt(IPV6_V6ONLY)"); 3688 close(s); 3689 return (NULL); 3690 } 3691 } 3692#endif 3693 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval, 3694 sizeof(int)) < 0) { 3695 logerror("setsockopt(SO_REUSEADDR)"); 3696 close(s); 3697 return (NULL); 3698 } 3699 3700 /* 3701 * Bind INET and UNIX-domain sockets. 3702 * 3703 * A UNIX-domain socket is always bound to a pathname 3704 * regardless of -N flag. 3705 * 3706 * For INET sockets, RFC 3164 recommends that client 3707 * side message should come from the privileged syslogd port. 3708 * 3709 * If the system administrator chooses not to obey 3710 * this, we can skip the bind() step so that the 3711 * system will choose a port for us. 3712 */ 3713 if (ai->ai_family == AF_LOCAL) 3714 unlink(name); 3715 if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) { 3716 if (bind(s, ai->ai_addr, ai->ai_addrlen) < 0) { 3717 logerror("bind"); 3718 close(s); 3719 return (NULL); 3720 } 3721 if (ai->ai_family == AF_LOCAL || SecureMode == 0) 3722 increase_rcvbuf(s); 3723 } 3724 if (ai->ai_family == AF_LOCAL && chmod(name, mode) < 0) { 3725 dprintf("chmod %s: %s\n", name, strerror(errno)); 3726 close(s); 3727 return (NULL); 3728 } 3729 dprintf("new socket fd is %d\n", s); 3730 sl_recv = socklist_recv_sock; 3731#if defined(INET) || defined(INET6) 3732 if (SecureMode && (ai->ai_family == AF_INET || 3733 ai->ai_family == AF_INET6)) { 3734 dprintf("shutdown\n"); 3735 /* Forbid communication in secure mode. */ 3736 if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) { 3737 logerror("shutdown"); 3738 if (!Debug) 3739 die(0); 3740 } 3741 sl_recv = NULL; 3742 } else 3743#endif 3744 dprintf("listening on socket\n"); 3745 dprintf("sending on socket\n"); 3746 /* Copy *ai->ai_addr to the tail of struct socklist if any. */ 3747 sl = calloc(1, sizeof(*sl) + ai->ai_addrlen); 3748 if (sl == NULL) 3749 err(1, "malloc failed"); 3750 sl->sl_socket = s; 3751 if (ai->ai_family == AF_LOCAL) { 3752 char *name2 = strdup(name); 3753 if (name2 == NULL) 3754 err(1, "strdup failed"); 3755 sl->sl_name = strdup(basename(name2)); 3756 sl->sl_dirfd = open(dirname(name2), O_DIRECTORY); 3757 if (sl->sl_name == NULL || sl->sl_dirfd == -1) 3758 err(1, "failed to save dir info for %s", name); 3759 free(name2); 3760 } 3761 sl->sl_recv = sl_recv; 3762 (void)memcpy(&sl->sl_ai, ai, sizeof(*ai)); 3763 if (ai->ai_addrlen > 0) { 3764 (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen); 3765 sl->sl_sa = (struct sockaddr *)(sl + 1); 3766 } else { 3767 sl->sl_sa = NULL; 3768 } 3769 return (sl); 3770} 3771 3772static void 3773increase_rcvbuf(int fd) 3774{ 3775 socklen_t len; 3776 3777 if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, 3778 &(socklen_t){sizeof(len)}) == 0) { 3779 if (len < RCVBUF_MINSIZE) { 3780 len = RCVBUF_MINSIZE; 3781 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); 3782 } 3783 } 3784} 3785