usr.sbin/syslogd/syslogd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1983, 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31 /*-
  32  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  33  *
  34  * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/
  35  * Author: Ed Schouten <ed@FreeBSD.org>
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  */
  58
  59 #ifndef lint
  60 static const char copyright[] =
  61 "@(#) Copyright (c) 1983, 1988, 1993, 1994\n\
  62         The Regents of the University of California.  All rights reserved.\n";
  63 #endif /* not lint */
  64
  65 #ifndef lint
  66 #if 0
  67 static char sccsid[] = "@(#)syslogd.c   8.3 (Berkeley) 4/4/94";
  68 #endif
  69 #endif /* not lint */
  70
  71 #include <sys/cdefs.h>
  72 __FBSDID("$FreeBSD$");
  73
  74 /*
  75  *  syslogd -- log system messages
  76  *
  77  * This program implements a system log. It takes a series of lines.
  78  * Each line may have a priority, signified as "<n>" as
  79  * the first characters of the line.  If this is
  80  * not present, a default priority is used.
  81  *
  82  * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
  83  * cause it to reread its configuration file.
  84  *
  85  * Defined Constants:
  86  *
  87  * MAXLINE -- the maximum line length that can be handled.
  88  * DEFUPRI -- the default priority for user messages
  89  * DEFSPRI -- the default priority for kernel messages
  90  *
  91  * Author: Eric Allman
  92  * extensive changes by Ralph Campbell
  93  * more extensive changes by Eric Allman (again)
  94  * Extension to log by program name as well as facility and priority
  95  *   by Peter da Silva.
  96  * -u and -v by Harlan Stenn.
  97  * Priority comparison code by Harlan Stenn.
  98  */
  99
 100 /* Maximum number of characters in time of last occurrence */
 101 #define MAXLINE         2048            /* maximum line length */
 102 #define MAXSVLINE       MAXLINE         /* maximum saved line length */
 103 #define DEFUPRI         (LOG_USER|LOG_NOTICE)
 104 #define DEFSPRI         (LOG_KERN|LOG_CRIT)
 105 #define TIMERINTVL      30              /* interval for checking flush, mark */
 106 #define TTYMSGTIME      1               /* timeout passed to ttymsg */
 107 #define RCVBUF_MINSIZE  (80 * 1024)     /* minimum size of dgram rcv buffer */
 108
 109 #include <sys/param.h>
 110 #include <sys/ioctl.h>
 111 #include <sys/mman.h>
 112 #include <sys/queue.h>
 113 #include <sys/resource.h>
 114 #include <sys/socket.h>
 115 #include <sys/stat.h>
 116 #include <sys/syslimits.h>
 117 #include <sys/time.h>
 118 #include <sys/uio.h>
 119 #include <sys/un.h>
 120 #include <sys/wait.h>
 121
 122 #if defined(INET) || defined(INET6)
 123 #include <netinet/in.h>
 124 #include <arpa/inet.h>
 125 #endif
 126
 127 #include <assert.h>
 128 #include <ctype.h>
 129 #include <dirent.h>
 130 #include <err.h>
 131 #include <errno.h>
 132 #include <fcntl.h>
 133 #include <fnmatch.h>
 134 #include <libutil.h>
 135 #include <limits.h>
 136 #include <netdb.h>
 137 #include <paths.h>
 138 #include <signal.h>
 139 #include <stdbool.h>
 140 #include <stddef.h>
 141 #include <stdio.h>
 142 #include <stdlib.h>
 143 #include <string.h>
 144 #include <sysexits.h>
 145 #include <unistd.h>
 146 #include <utmpx.h>
 147 #include <regex.h>
 148
 149 #include "pathnames.h"
 150 #include "ttymsg.h"
 151
 152 #define SYSLOG_NAMES
 153 #include <sys/syslog.h>
 154
 155 static const char *ConfFile = _PATH_LOGCONF;
 156 static const char *PidFile = _PATH_LOGPID;
 157 static const char ctty[] = _PATH_CONSOLE;
 158 static const char include_str[] = "include";
 159 static const char include_ext[] = ".conf";
 160
 161 #define dprintf         if (Debug) printf
 162
 163 #define MAXUNAMES       20      /* maximum number of user names */
 164
 165 #define sstosa(ss)      ((struct sockaddr *)(ss))
 166 #ifdef INET
 167 #define sstosin(ss)     ((struct sockaddr_in *)(void *)(ss))
 168 #define satosin(sa)     ((struct sockaddr_in *)(void *)(sa))
 169 #endif
 170 #ifdef INET6
 171 #define sstosin6(ss)    ((struct sockaddr_in6 *)(void *)(ss))
 172 #define satosin6(sa)    ((struct sockaddr_in6 *)(void *)(sa))
 173 #define s6_addr32       __u6_addr.__u6_addr32
 174 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m)      (       \
 175         (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
 176         (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
 177         (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
 178         (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 )
 179 #endif
 180 /*
 181  * List of peers and sockets for binding.
 182  */
 183 struct peer {
 184         const char      *pe_name;
 185         const char      *pe_serv;
 186         mode_t          pe_mode;
 187         STAILQ_ENTRY(peer)      next;
 188 };
 189 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue);
 190
 191 struct socklist {
 192         struct addrinfo         sl_ai;
 193 #define sl_sa           sl_ai.ai_addr
 194 #define sl_salen        sl_ai.ai_addrlen
 195 #define sl_family       sl_ai.ai_family
 196         int                     sl_socket;
 197         struct peer             *sl_peer;
 198         int                     (*sl_recv)(struct socklist *);
 199         STAILQ_ENTRY(socklist)  next;
 200 };
 201 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead);
 202
 203 /*
 204  * Flags to logmsg().
 205  */
 206
 207 #define IGN_CONS        0x001   /* don't print on console */
 208 #define SYNC_FILE       0x002   /* do fsync on file after printing */
 209 #define MARK            0x008   /* this message is a mark */
 210 #define ISKERNEL        0x010   /* kernel generated message */
 211
 212 /* Timestamps of log entries. */
 213 struct logtime {
 214         struct tm       tm;
 215         suseconds_t     usec;
 216 };
 217
 218 /* Traditional syslog timestamp format. */
 219 #define RFC3164_DATELEN 15
 220 #define RFC3164_DATEFMT "%b %e %H:%M:%S"
 221
 222 /*
 223  * This structure holds a property-based filter
 224  */
 225
 226 struct prop_filter {
 227         uint8_t prop_type;
 228 #define PROP_TYPE_NOOP          0
 229 #define PROP_TYPE_MSG           1
 230 #define PROP_TYPE_HOSTNAME      2
 231 #define PROP_TYPE_PROGNAME      3
 232
 233         uint8_t cmp_type;
 234 #define PROP_CMP_CONTAINS       1
 235 #define PROP_CMP_EQUAL          2
 236 #define PROP_CMP_STARTS         3
 237 #define PROP_CMP_REGEX          4
 238
 239         uint16_t cmp_flags;
 240 #define PROP_FLAG_EXCLUDE       (1 << 0)
 241 #define PROP_FLAG_ICASE         (1 << 1)
 242
 243         union {
 244                 char *p_strval;
 245                 regex_t *p_re;
 246         } pflt_uniptr;
 247 #define pflt_strval     pflt_uniptr.p_strval
 248 #define pflt_re         pflt_uniptr.p_re
 249
 250         size_t  pflt_strlen;
 251 };
 252
 253 /*
 254  * This structure represents the files that will have log
 255  * copies printed.
 256  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
 257  * or if f_type is F_PIPE and f_pid > 0.
 258  */
 259
 260 struct filed {
 261         STAILQ_ENTRY(filed)     next;   /* next in linked list */
 262         short   f_type;                 /* entry type, see below */
 263         short   f_file;                 /* file descriptor */
 264         time_t  f_time;                 /* time this was last written */
 265         char    *f_host;                /* host from which to recd. */
 266         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
 267         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
 268 #define PRI_LT  0x1
 269 #define PRI_EQ  0x2
 270 #define PRI_GT  0x4
 271         char    *f_program;             /* program this applies to */
 272         struct prop_filter *f_prop_filter; /* property-based filter */
 273         union {
 274                 char    f_uname[MAXUNAMES][MAXLOGNAME];
 275                 struct {
 276                         char    f_hname[MAXHOSTNAMELEN];
 277                         struct addrinfo *f_addr;
 278
 279                 } f_forw;               /* forwarding address */
 280                 char    f_fname[MAXPATHLEN];
 281                 struct {
 282                         char    f_pname[MAXPATHLEN];
 283                         pid_t   f_pid;
 284                 } f_pipe;
 285         } f_un;
 286 #define fu_uname        f_un.f_uname
 287 #define fu_forw_hname   f_un.f_forw.f_hname
 288 #define fu_forw_addr    f_un.f_forw.f_addr
 289 #define fu_fname        f_un.f_fname
 290 #define fu_pipe_pname   f_un.f_pipe.f_pname
 291 #define fu_pipe_pid     f_un.f_pipe.f_pid
 292         char    f_prevline[MAXSVLINE];          /* last message logged */
 293         struct logtime f_lasttime;              /* time of last occurrence */
 294         int     f_prevpri;                      /* pri of f_prevline */
 295         size_t  f_prevlen;                      /* length of f_prevline */
 296         int     f_prevcount;                    /* repetition cnt of prevline */
 297         u_int   f_repeatcount;                  /* number of "repeated" msgs */
 298         int     f_flags;                        /* file-specific flags */
 299 #define FFLAG_SYNC 0x01
 300 #define FFLAG_NEEDSYNC  0x02
 301 };
 302
 303 /*
 304  * Queue of about-to-be dead processes we should watch out for.
 305  */
 306 struct deadq_entry {
 307         pid_t                           dq_pid;
 308         int                             dq_timeout;
 309         TAILQ_ENTRY(deadq_entry)        dq_entries;
 310 };
 311 static TAILQ_HEAD(, deadq_entry) deadq_head =
 312     TAILQ_HEAD_INITIALIZER(deadq_head);
 313
 314 /*
 315  * The timeout to apply to processes waiting on the dead queue.  Unit
 316  * of measure is `mark intervals', i.e. 20 minutes by default.
 317  * Processes on the dead queue will be terminated after that time.
 318  */
 319
 320 #define  DQ_TIMO_INIT   2
 321
 322 /*
 323  * Struct to hold records of network addresses that are allowed to log
 324  * to us.
 325  */
 326 struct allowedpeer {
 327         int isnumeric;
 328         u_short port;
 329         union {
 330                 struct {
 331                         struct sockaddr_storage addr;
 332                         struct sockaddr_storage mask;
 333                 } numeric;
 334                 char *name;
 335         } u;
 336 #define a_addr u.numeric.addr
 337 #define a_mask u.numeric.mask
 338 #define a_name u.name
 339         STAILQ_ENTRY(allowedpeer)       next;
 340 };
 341 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead);
 342
 343
 344 /*
 345  * Intervals at which we flush out "message repeated" messages,
 346  * in seconds after previous message is logged.  After each flush,
 347  * we move to the next interval until we reach the largest.
 348  */
 349 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
 350 #define MAXREPEAT       (nitems(repeatinterval) - 1)
 351 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
 352 #define BACKOFF(f)      do {                                            \
 353                                 if (++(f)->f_repeatcount > MAXREPEAT)   \
 354                                         (f)->f_repeatcount = MAXREPEAT; \
 355                         } while (0)
 356
 357 /* values for f_type */
 358 #define F_UNUSED        0               /* unused entry */
 359 #define F_FILE          1               /* regular file */
 360 #define F_TTY           2               /* terminal */
 361 #define F_CONSOLE       3               /* console terminal */
 362 #define F_FORW          4               /* remote machine */
 363 #define F_USERS         5               /* list of users */
 364 #define F_WALL          6               /* everyone logged on */
 365 #define F_PIPE          7               /* pipe to program */
 366
 367 static const char *TypeNames[] = {
 368         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
 369         "FORW",         "USERS",        "WALL",         "PIPE"
 370 };
 371
 372 static STAILQ_HEAD(, filed) fhead =
 373     STAILQ_HEAD_INITIALIZER(fhead);     /* Log files that we write to */
 374 static struct filed consfile;   /* Console */
 375
 376 static int      Debug;          /* debug flag */
 377 static int      Foreground = 0; /* Run in foreground, instead of daemonizing */
 378 static int      resolve = 1;    /* resolve hostname */
 379 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
 380 static const char *LocalDomain; /* our local domain name */
 381 static int      Initialized;    /* set when we have initialized ourselves */
 382 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
 383 static int      MarkSeq;        /* mark sequence number */
 384 static int      NoBind;         /* don't bind() as suggested by RFC 3164 */
 385 static int      SecureMode;     /* when true, receive only unix domain socks */
 386 #ifdef INET6
 387 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
 388 #else
 389 static int      family = PF_INET; /* protocol family (IPv4 only) */
 390 #endif
 391 static int      mask_C1 = 1;    /* mask characters from 0x80 - 0x9F */
 392 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
 393 static int      use_bootfile;   /* log entire bootfile for every kern msg */
 394 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
 395 static int      logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
 396
 397 static char     bootfile[MAXLINE+1]; /* booted kernel file */
 398
 399 static int      RemoteAddDate;  /* Always set the date on remote messages */
 400 static int      RemoteHostname; /* Log remote hostname from the message */
 401
 402 static int      UniquePriority; /* Only log specified priority? */
 403 static int      LogFacPri;      /* Put facility and priority in log message: */
 404                                 /* 0=no, 1=numeric, 2=names */
 405 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
 406 static int      needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
 407 static struct pidfh *pfh;
 408 static int      sigpipe[2];     /* Pipe to catch a signal during select(). */
 409 static bool     RFC3164OutputFormat = true; /* Use legacy format by default. */
 410
 411 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild;
 412
 413 struct iovlist;
 414
 415 static int      allowaddr(char *);
 416 static int      addfile(struct filed *);
 417 static int      addpeer(struct peer *);
 418 static int      addsock(struct addrinfo *, struct socklist *);
 419 static struct filed *cfline(const char *, const char *, const char *,
 420     const char *);
 421 static const char *cvthname(struct sockaddr *);
 422 static void     deadq_enter(pid_t, const char *);
 423 static int      deadq_remove(struct deadq_entry *);
 424 static int      deadq_removebypid(pid_t);
 425 static int      decode(const char *, const CODE *);
 426 static void     die(int) __dead2;
 427 static void     dodie(int);
 428 static void     dofsync(void);
 429 static void     domark(int);
 430 static void     fprintlog_first(struct filed *, const char *, const char *,
 431     const char *, const char *, const char *, const char *, int);
 432 static void     fprintlog_write(struct filed *, struct iovlist *, int);
 433 static void     fprintlog_successive(struct filed *, int);
 434 static void     init(int);
 435 static void     logerror(const char *);
 436 static void     logmsg(int, const struct logtime *, const char *, const char *,
 437     const char *, const char *, const char *, const char *, int);
 438 static void     log_deadchild(pid_t, int, const char *);
 439 static void     markit(void);
 440 static int      socksetup(struct peer *);
 441 static int      socklist_recv_file(struct socklist *);
 442 static int      socklist_recv_sock(struct socklist *);
 443 static int      socklist_recv_signal(struct socklist *);
 444 static void     sighandler(int);
 445 static int      skip_message(const char *, const char *, int);
 446 static int      evaluate_prop_filter(const struct prop_filter *filter,
 447     const char *value);
 448 static int      prop_filter_compile(struct prop_filter *pfilter,
 449     char *filterstr);
 450 static void     parsemsg(const char *, char *);
 451 static void     printsys(char *);
 452 static int      p_open(const char *, pid_t *);
 453 static void     reapchild(int);
 454 static const char *ttymsg_check(struct iovec *, int, char *, int);
 455 static void     usage(void);
 456 static int      validate(struct sockaddr *, const char *);
 457 static void     unmapped(struct sockaddr *);
 458 static void     wallmsg(struct filed *, struct iovec *, const int iovlen);
 459 static int      waitdaemon(int);
 460 static void     timedout(int);
 461 static void     increase_rcvbuf(int);
 462
 463 static void
 464 close_filed(struct filed *f)
 465 {
 466
 467         if (f == NULL || f->f_file == -1)
 468                 return;
 469
 470         switch (f->f_type) {
 471         case F_FORW:
 472                 if (f->fu_forw_addr != NULL) {
 473                         freeaddrinfo(f->fu_forw_addr);
 474                         f->fu_forw_addr = NULL;
 475                 }
 476                 /* FALLTHROUGH */
 477
 478         case F_FILE:
 479         case F_TTY:
 480         case F_CONSOLE:
 481                 f->f_type = F_UNUSED;
 482                 break;
 483         case F_PIPE:
 484                 f->fu_pipe_pid = 0;
 485                 break;
 486         }
 487         (void)close(f->f_file);
 488         f->f_file = -1;
 489 }
 490
 491 static int
 492 addfile(struct filed *f0)
 493 {
 494         struct filed *f;
 495
 496         f = calloc(1, sizeof(*f));
 497         if (f == NULL)
 498                 err(1, "malloc failed");
 499         *f = *f0;
 500         STAILQ_INSERT_TAIL(&fhead, f, next);
 501
 502         return (0);
 503 }
 504
 505 static int
 506 addpeer(struct peer *pe0)
 507 {
 508         struct peer *pe;
 509
 510         pe = calloc(1, sizeof(*pe));
 511         if (pe == NULL)
 512                 err(1, "malloc failed");
 513         *pe = *pe0;
 514         STAILQ_INSERT_TAIL(&pqueue, pe, next);
 515
 516         return (0);
 517 }
 518
 519 static int
 520 addsock(struct addrinfo *ai, struct socklist *sl0)
 521 {
 522         struct socklist *sl;
 523
 524         /* Copy *ai->ai_addr to the tail of struct socklist if any. */
 525         sl = calloc(1, sizeof(*sl) + ((ai != NULL) ? ai->ai_addrlen : 0));
 526         if (sl == NULL)
 527                 err(1, "malloc failed");
 528         *sl = *sl0;
 529         if (ai != NULL) {
 530                 memcpy(&sl->sl_ai, ai, sizeof(*ai));
 531                 if (ai->ai_addrlen > 0) {
 532                         memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen);
 533                         sl->sl_sa = (struct sockaddr *)(sl + 1);
 534                 } else
 535                         sl->sl_sa = NULL;
 536         }
 537         STAILQ_INSERT_TAIL(&shead, sl, next);
 538
 539         return (0);
 540 }
 541
 542 int
 543 main(int argc, char *argv[])
 544 {
 545         int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0;
 546         fd_set *fdsr = NULL;
 547         struct timeval tv, *tvp;
 548         struct peer *pe;
 549         struct socklist *sl;
 550         pid_t ppid = 1, spid;
 551         char *p;
 552
 553         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 554                 dprintf("madvise() failed: %s\n", strerror(errno));
 555
 556         while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:m:nNoO:p:P:sS:Tuv"))
 557             != -1)
 558                 switch (ch) {
 559 #ifdef INET
 560                 case '4':
 561                         family = PF_INET;
 562                         break;
 563 #endif
 564 #ifdef INET6
 565                 case '6':
 566                         family = PF_INET6;
 567                         break;
 568 #endif
 569                 case '8':
 570                         mask_C1 = 0;
 571                         break;
 572                 case 'A':
 573                         send_to_all++;
 574                         break;
 575                 case 'a':               /* allow specific network addresses only */
 576                         if (allowaddr(optarg) == -1)
 577                                 usage();
 578                         break;
 579                 case 'b':
 580                         bflag = 1;
 581                         p = strchr(optarg, ']');
 582                         if (p != NULL)
 583                                 p = strchr(p + 1, ':');
 584                         else {
 585                                 p = strchr(optarg, ':');
 586                                 if (p != NULL && strchr(p + 1, ':') != NULL)
 587                                         p = NULL; /* backward compatibility */
 588                         }
 589                         if (p == NULL) {
 590                                 /* A hostname or filename only. */
 591                                 addpeer(&(struct peer){
 592                                         .pe_name = optarg,
 593                                         .pe_serv = "syslog"
 594                                 });
 595                         } else {
 596                                 /* The case of "name:service". */
 597                                 *p++ = '\0';
 598                                 addpeer(&(struct peer){
 599                                         .pe_serv = p,
 600                                         .pe_name = (strlen(optarg) == 0) ?
 601                                             NULL : optarg,
 602                                 });
 603                         }
 604                         break;
 605                 case 'c':
 606                         no_compress++;
 607                         break;
 608                 case 'C':
 609                         logflags |= O_CREAT;
 610                         break;
 611                 case 'd':               /* debug */
 612                         Debug++;
 613                         break;
 614                 case 'f':               /* configuration file */
 615                         ConfFile = optarg;
 616                         break;
 617                 case 'F':               /* run in foreground instead of daemon */
 618                         Foreground++;
 619                         break;
 620                 case 'H':
 621                         RemoteHostname = 1;
 622                         break;
 623                 case 'k':               /* keep remote kern fac */
 624                         KeepKernFac = 1;
 625                         break;
 626                 case 'l':
 627                 case 'p':
 628                 case 'S':
 629                     {
 630                         long    perml;
 631                         mode_t  mode;
 632                         char    *name, *ep;
 633
 634                         if (ch == 'l')
 635                                 mode = DEFFILEMODE;
 636                         else if (ch == 'p') {
 637                                 mode = DEFFILEMODE;
 638                                 pflag = 1;
 639                         } else {
 640                                 mode = S_IRUSR | S_IWUSR;
 641                                 Sflag = 1;
 642                         }
 643                         if (optarg[0] == '/')
 644                                 name = optarg;
 645                         else if ((name = strchr(optarg, ':')) != NULL) {
 646                                 *name++ = '\0';
 647                                 if (name[0] != '/')
 648                                         errx(1, "socket name must be absolute "
 649                                             "path");
 650                                 if (isdigit(*optarg)) {
 651                                         perml = strtol(optarg, &ep, 8);
 652                                     if (*ep || perml < 0 ||
 653                                         perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
 654                                             errx(1, "invalid mode %s, exiting",
 655                                                 optarg);
 656                                     mode = (mode_t )perml;
 657                                 } else
 658                                         errx(1, "invalid mode %s, exiting",
 659                                             optarg);
 660                         } else
 661                                 errx(1, "invalid filename %s, exiting",
 662                                     optarg);
 663                         addpeer(&(struct peer){
 664                                 .pe_name = name,
 665                                 .pe_mode = mode
 666                         });
 667                         break;
 668                    }
 669                 case 'm':               /* mark interval */
 670                         MarkInterval = atoi(optarg) * 60;
 671                         break;
 672                 case 'N':
 673                         NoBind = 1;
 674                         SecureMode = 1;
 675                         break;
 676                 case 'n':
 677                         resolve = 0;
 678                         break;
 679                 case 'O':
 680                         if (strcmp(optarg, "bsd") == 0 ||
 681                             strcmp(optarg, "rfc3164") == 0)
 682                                 RFC3164OutputFormat = true;
 683                         else if (strcmp(optarg, "syslog") == 0 ||
 684                             strcmp(optarg, "rfc5424") == 0)
 685                                 RFC3164OutputFormat = false;
 686                         else
 687                                 usage();
 688                         break;
 689                 case 'o':
 690                         use_bootfile = 1;
 691                         break;
 692                 case 'P':               /* path for alt. PID */
 693                         PidFile = optarg;
 694                         break;
 695                 case 's':               /* no network mode */
 696                         SecureMode++;
 697                         break;
 698                 case 'T':
 699                         RemoteAddDate = 1;
 700                         break;
 701                 case 'u':               /* only log specified priority */
 702                         UniquePriority++;
 703                         break;
 704                 case 'v':               /* log facility and priority */
 705                         LogFacPri++;
 706                         break;
 707                 default:
 708                         usage();
 709                 }
 710         if ((argc -= optind) != 0)
 711                 usage();
 712
 713         /* Pipe to catch a signal during select(). */
 714         s = pipe2(sigpipe, O_CLOEXEC);
 715         if (s < 0) {
 716                 err(1, "cannot open a pipe for signals");
 717         } else {
 718                 addsock(NULL, &(struct socklist){
 719                     .sl_socket = sigpipe[0],
 720                     .sl_recv = socklist_recv_signal
 721                 });
 722         }
 723
 724         /* Listen by default: /dev/klog. */
 725         s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0);
 726         if (s < 0) {
 727                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
 728         } else {
 729                 addsock(NULL, &(struct socklist){
 730                         .sl_socket = s,
 731                         .sl_recv = socklist_recv_file,
 732                 });
 733         }
 734         /* Listen by default: *:514 if no -b flag. */
 735         if (bflag == 0)
 736                 addpeer(&(struct peer){
 737                         .pe_serv = "syslog"
 738                 });
 739         /* Listen by default: /var/run/log if no -p flag. */
 740         if (pflag == 0)
 741                 addpeer(&(struct peer){
 742                         .pe_name = _PATH_LOG,
 743                         .pe_mode = DEFFILEMODE,
 744                 });
 745         /* Listen by default: /var/run/logpriv if no -S flag. */
 746         if (Sflag == 0)
 747                 addpeer(&(struct peer){
 748                         .pe_name = _PATH_LOG_PRIV,
 749                         .pe_mode = S_IRUSR | S_IWUSR,
 750                 });
 751         STAILQ_FOREACH(pe, &pqueue, next)
 752                 socksetup(pe);
 753
 754         pfh = pidfile_open(PidFile, 0600, &spid);
 755         if (pfh == NULL) {
 756                 if (errno == EEXIST)
 757                         errx(1, "syslogd already running, pid: %d", spid);
 758                 warn("cannot open pid file");
 759         }
 760
 761         if ((!Foreground) && (!Debug)) {
 762                 ppid = waitdaemon(30);
 763                 if (ppid < 0) {
 764                         warn("could not become daemon");
 765                         pidfile_remove(pfh);
 766                         exit(1);
 767                 }
 768         } else if (Debug)
 769                 setlinebuf(stdout);
 770
 771         consfile.f_type = F_CONSOLE;
 772         (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1,
 773             sizeof(consfile.fu_fname));
 774         (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
 775         (void)signal(SIGTERM, dodie);
 776         (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
 777         (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
 778         (void)signal(SIGHUP, sighandler);
 779         (void)signal(SIGCHLD, sighandler);
 780         (void)signal(SIGALRM, domark);
 781         (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
 782         (void)alarm(TIMERINTVL);
 783
 784         /* tuck my process id away */
 785         pidfile_write(pfh);
 786
 787         dprintf("off & running....\n");
 788
 789         tvp = &tv;
 790         tv.tv_sec = tv.tv_usec = 0;
 791
 792         STAILQ_FOREACH(sl, &shead, next) {
 793                 if (sl->sl_socket > fdsrmax)
 794                         fdsrmax = sl->sl_socket;
 795         }
 796         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
 797             sizeof(*fdsr));
 798         if (fdsr == NULL)
 799                 errx(1, "calloc fd_set");
 800
 801         for (;;) {
 802                 if (Initialized == 0)
 803                         init(0);
 804                 else if (WantInitialize)
 805                         init(WantInitialize);
 806                 if (WantReapchild)
 807                         reapchild(WantReapchild);
 808                 if (MarkSet)
 809                         markit();
 810                 if (WantDie) {
 811                         free(fdsr);
 812                         die(WantDie);
 813                 }
 814
 815                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
 816                     sizeof(*fdsr));
 817
 818                 STAILQ_FOREACH(sl, &shead, next) {
 819                         if (sl->sl_socket != -1 && sl->sl_recv != NULL)
 820                                 FD_SET(sl->sl_socket, fdsr);
 821                 }
 822                 i = select(fdsrmax + 1, fdsr, NULL, NULL,
 823                     needdofsync ? &tv : tvp);
 824                 switch (i) {
 825                 case 0:
 826                         dofsync();
 827                         needdofsync = 0;
 828                         if (tvp) {
 829                                 tvp = NULL;
 830                                 if (ppid != 1)
 831                                         kill(ppid, SIGALRM);
 832                         }
 833                         continue;
 834                 case -1:
 835                         if (errno != EINTR)
 836                                 logerror("select");
 837                         continue;
 838                 }
 839                 STAILQ_FOREACH(sl, &shead, next) {
 840                         if (FD_ISSET(sl->sl_socket, fdsr))
 841                                 (*sl->sl_recv)(sl);
 842                 }
 843         }
 844         free(fdsr);
 845 }
 846
 847 static int
 848 socklist_recv_signal(struct socklist *sl __unused)
 849 {
 850         ssize_t len;
 851         int i, nsig, signo;
 852
 853         if (ioctl(sigpipe[0], FIONREAD, &i) != 0) {
 854                 logerror("ioctl(FIONREAD)");
 855                 err(1, "signal pipe read failed");
 856         }
 857         nsig = i / sizeof(signo);
 858         dprintf("# of received signals = %d\n", nsig);
 859         for (i = 0; i < nsig; i++) {
 860                 len = read(sigpipe[0], &signo, sizeof(signo));
 861                 if (len != sizeof(signo)) {
 862                         logerror("signal pipe read failed");
 863                         err(1, "signal pipe read failed");
 864                 }
 865                 dprintf("Received signal: %d from fd=%d\n", signo,
 866                     sigpipe[0]);
 867                 switch (signo) {
 868                 case SIGHUP:
 869                         WantInitialize = 1;
 870                         break;
 871                 case SIGCHLD:
 872                         WantReapchild = 1;
 873                         break;
 874                 }
 875         }
 876         return (0);
 877 }
 878
 879 static int
 880 socklist_recv_sock(struct socklist *sl)
 881 {
 882         struct sockaddr_storage ss;
 883         struct sockaddr *sa = (struct sockaddr *)&ss;
 884         socklen_t sslen;
 885         const char *hname;
 886         char line[MAXLINE + 1];
 887         int len;
 888
 889         sslen = sizeof(ss);
 890         len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen);
 891         dprintf("received sa_len = %d\n", sslen);
 892         if (len == 0)
 893                 return (-1);
 894         if (len < 0) {
 895                 if (errno != EINTR)
 896                         logerror("recvfrom");
 897                 return (-1);
 898         }
 899         /* Received valid data. */
 900         line[len] = '\0';
 901         if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL)
 902                 hname = LocalHostName;
 903         else {
 904                 hname = cvthname(sa);
 905                 unmapped(sa);
 906                 if (validate(sa, hname) == 0) {
 907                         dprintf("Message from %s was ignored.", hname);
 908                         return (-1);
 909                 }
 910         }
 911         parsemsg(hname, line);
 912
 913         return (0);
 914 }
 915
 916 static void
 917 unmapped(struct sockaddr *sa)
 918 {
 919 #if defined(INET) && defined(INET6)
 920         struct sockaddr_in6 *sin6;
 921         struct sockaddr_in sin;
 922
 923         if (sa == NULL ||
 924             sa->sa_family != AF_INET6 ||
 925             sa->sa_len != sizeof(*sin6))
 926                 return;
 927         sin6 = satosin6(sa);
 928         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 929                 return;
 930         sin = (struct sockaddr_in){
 931                 .sin_family = AF_INET,
 932                 .sin_len = sizeof(sin),
 933                 .sin_port = sin6->sin6_port
 934         };
 935         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 936             sizeof(sin.sin_addr));
 937         memcpy(sa, &sin, sizeof(sin));
 938 #else
 939         if (sa == NULL)
 940                 return;
 941 #endif
 942 }
 943
 944 static void
 945 usage(void)
 946 {
 947
 948         fprintf(stderr,
 949                 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n"
 950                 "               [-b bind_address] [-f config_file]\n"
 951                 "               [-l [mode:]path] [-m mark_interval]\n"
 952                 "               [-O format] [-P pid_file] [-p log_socket]\n"
 953                 "               [-S logpriv_socket]\n");
 954         exit(1);
 955 }
 956
 957 /*
 958  * Removes characters from log messages that are unsafe to display.
 959  * TODO: Permit UTF-8 strings that include a BOM per RFC 5424?
 960  */
 961 static void
 962 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen)
 963 {
 964         char *q;
 965         int c;
 966
 967         q = out;
 968         while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) {
 969                 if (mask_C1 && (c & 0x80) && c < 0xA0) {
 970                         c &= 0x7F;
 971                         *q++ = 'M';
 972                         *q++ = '-';
 973                 }
 974                 if (isascii(c) && iscntrl(c)) {
 975                         if (c == '\n') {
 976                                 *q++ = ' ';
 977                         } else if (c == '\t') {
 978                                 *q++ = '\t';
 979                         } else {
 980                                 *q++ = '^';
 981                                 *q++ = c ^ 0100;
 982                         }
 983                 } else {
 984                         *q++ = c;
 985                 }
 986         }
 987         *q = '\0';
 988 }
 989
 990 /*
 991  * Parses a syslog message according to RFC 5424, assuming that PRI and
 992  * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The
 993  * parsed result is passed to logmsg().
 994  */
 995 static void
 996 parsemsg_rfc5424(const char *from, int pri, char *msg)
 997 {
 998         const struct logtime *timestamp;
 999         struct logtime timestamp_remote;
1000         const char *omsg, *hostname, *app_name, *procid, *msgid,
1001             *structured_data;
1002         char line[MAXLINE + 1];
1003
1004 #define FAIL_IF(field, expr) do {                                       \
1005         if (expr) {                                                     \
1006                 dprintf("Failed to parse " field " from %s: %s\n",      \
1007                     from, omsg);                                        \
1008                 return;                                                 \
1009         }                                                               \
1010 } while (0)
1011 #define PARSE_CHAR(field, sep) do {                                     \
1012         FAIL_IF(field, *msg != sep);                                    \
1013         ++msg;                                                          \
1014 } while (0)
1015 #define IF_NOT_NILVALUE(var)                                            \
1016         if (msg[0] == '-' && msg[1] == ' ') {                           \
1017                 msg += 2;                                               \
1018                 var = NULL;                                             \
1019         } else if (msg[0] == '-' && msg[1] == '\0') {                   \
1020                 ++msg;                                                  \
1021                 var = NULL;                                             \
1022         } else
1023
1024         omsg = msg;
1025         IF_NOT_NILVALUE(timestamp) {
1026                 /* Parse RFC 3339-like timestamp. */
1027 #define PARSE_NUMBER(dest, length, min, max) do {                       \
1028         int i, v;                                                       \
1029                                                                         \
1030         v = 0;                                                          \
1031         for (i = 0; i < length; ++i) {                                  \
1032                 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9');         \
1033                 v = v * 10 + *msg++ - '0';                              \
1034         }                                                               \
1035         FAIL_IF("TIMESTAMP", v < min || v > max);                       \
1036         dest = v;                                                       \
1037 } while (0)
1038                 /* Date and time. */
1039                 memset(&timestamp_remote, 0, sizeof(timestamp_remote));
1040                 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999);
1041                 timestamp_remote.tm.tm_year -= 1900;
1042                 PARSE_CHAR("TIMESTAMP", '-');
1043                 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12);
1044                 --timestamp_remote.tm.tm_mon;
1045                 PARSE_CHAR("TIMESTAMP", '-');
1046                 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31);
1047                 PARSE_CHAR("TIMESTAMP", 'T');
1048                 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23);
1049                 PARSE_CHAR("TIMESTAMP", ':');
1050                 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59);
1051                 PARSE_CHAR("TIMESTAMP", ':');
1052                 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59);
1053                 /* Perform normalization. */
1054                 timegm(&timestamp_remote.tm);
1055                 /* Optional: fractional seconds. */
1056                 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') {
1057                         int i;
1058
1059                         ++msg;
1060                         for (i = 100000; i != 0; i /= 10) {
1061                                 if (*msg < '0' || *msg > '9')
1062                                         break;
1063                                 timestamp_remote.usec += (*msg++ - '0') * i;
1064                         }
1065                 }
1066                 /* Timezone. */
1067                 if (*msg == 'Z') {
1068                         /* UTC. */
1069                         ++msg;
1070                 } else {
1071                         int sign, tz_hour, tz_min;
1072
1073                         /* Local time zone offset. */
1074                         FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+');
1075                         sign = *msg++ == '-' ? -1 : 1;
1076                         PARSE_NUMBER(tz_hour, 2, 0, 23);
1077                         PARSE_CHAR("TIMESTAMP", ':');
1078                         PARSE_NUMBER(tz_min, 2, 0, 59);
1079                         timestamp_remote.tm.tm_gmtoff =
1080                             sign * (tz_hour * 3600 + tz_min * 60);
1081                 }
1082 #undef PARSE_NUMBER
1083                 PARSE_CHAR("TIMESTAMP", ' ');
1084                 timestamp = RemoteAddDate ? NULL : &timestamp_remote;
1085         }
1086
1087         /* String fields part of the HEADER. */
1088 #define PARSE_STRING(field, var)                                        \
1089         IF_NOT_NILVALUE(var) {                                          \
1090                 var = msg;                                              \
1091                 while (*msg >= '!' && *msg <= '~')                      \
1092                         ++msg;                                          \
1093                 FAIL_IF(field, var == msg);                             \
1094                 PARSE_CHAR(field, ' ');                                 \
1095                 msg[-1] = '\0';                                         \
1096         }
1097         PARSE_STRING("HOSTNAME", hostname);
1098         if (hostname == NULL || !RemoteHostname)
1099                 hostname = from;
1100         PARSE_STRING("APP-NAME", app_name);
1101         PARSE_STRING("PROCID", procid);
1102         PARSE_STRING("MSGID", msgid);
1103 #undef PARSE_STRING
1104
1105         /* Structured data. */
1106 #define PARSE_SD_NAME() do {                                            \
1107         const char *start;                                              \
1108                                                                         \
1109         start = msg;                                                    \
1110         while (*msg >= '!' && *msg <= '~' && *msg != '=' &&             \
1111             *msg != ']' && *msg != '"')                                 \
1112                 ++msg;                                                  \
1113         FAIL_IF("STRUCTURED-NAME", start == msg);                       \
1114 } while (0)
1115         IF_NOT_NILVALUE(structured_data) {
1116                 /* SD-ELEMENT. */
1117                 while (*msg == '[') {
1118                         ++msg;
1119                         /* SD-ID. */
1120                         PARSE_SD_NAME();
1121                         /* SD-PARAM. */
1122                         while (*msg == ' ') {
1123                                 ++msg;
1124                                 /* PARAM-NAME. */
1125                                 PARSE_SD_NAME();
1126                                 PARSE_CHAR("STRUCTURED-NAME", '=');
1127                                 PARSE_CHAR("STRUCTURED-NAME", '"');
1128                                 while (*msg != '"') {
1129                                         FAIL_IF("STRUCTURED-NAME",
1130                                             *msg == '\0');
1131                                         if (*msg++ == '\\') {
1132                                                 FAIL_IF("STRUCTURED-NAME",
1133                                                     *msg == '\0');
1134                                                 ++msg;
1135                                         }
1136                                 }
1137                                 ++msg;
1138                         }
1139                         PARSE_CHAR("STRUCTURED-NAME", ']');
1140                 }
1141                 PARSE_CHAR("STRUCTURED-NAME", ' ');
1142                 msg[-1] = '\0';
1143         }
1144 #undef PARSE_SD_NAME
1145
1146 #undef FAIL_IF
1147 #undef PARSE_CHAR
1148 #undef IF_NOT_NILVALUE
1149
1150         parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
1151         logmsg(pri, timestamp, hostname, app_name, procid, msgid,
1152             structured_data, line, 0);
1153 }
1154
1155 /*
1156  * Returns the length of the application name ("TAG" in RFC 3164
1157  * terminology) and process ID from a message if present.
1158  */
1159 static void
1160 parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p,
1161     ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p)
1162 {
1163         const char *m, *procid_begin;
1164         size_t app_name_length, procid_length;
1165
1166         m = msg;
1167
1168         /* Application name. */
1169         app_name_length = strspn(m,
1170             "abcdefghijklmnopqrstuvwxyz"
1171             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1172             "0123456789"
1173             "_-/");
1174         if (app_name_length == 0)
1175                 goto bad;
1176         m += app_name_length;
1177
1178         /* Process identifier (optional). */
1179         if (*m == '[') {
1180                 procid_begin = ++m;
1181                 procid_length = strspn(m, "0123456789");
1182                 if (procid_length == 0)
1183                         goto bad;
1184                 m += procid_length;
1185                 if (*m++ != ']')
1186                         goto bad;
1187         } else {
1188                 procid_begin = NULL;
1189                 procid_length = 0;
1190         }
1191
1192         /* Separator. */
1193         if (m[0] != ':' || m[1] != ' ')
1194                 goto bad;
1195
1196         *app_name_length_p = app_name_length;
1197         if (procid_begin_offset_p != NULL)
1198                 *procid_begin_offset_p =
1199                     procid_begin == NULL ? 0 : procid_begin - msg;
1200         if (procid_length_p != NULL)
1201                 *procid_length_p = procid_length;
1202         return;
1203 bad:
1204         *app_name_length_p = 0;
1205         if (procid_begin_offset_p != NULL)
1206                 *procid_begin_offset_p = 0;
1207         if (procid_length_p != NULL)
1208                 *procid_length_p = 0;
1209 }
1210
1211 /*
1212  * Trims the application name ("TAG" in RFC 3164 terminology) and
1213  * process ID from a message if present.
1214  */
1215 static void
1216 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name,
1217     const char **procid)
1218 {
1219         char *m, *app_name_begin, *procid_begin;
1220         size_t app_name_length, procid_length;
1221         ptrdiff_t procid_begin_offset;
1222
1223         m = *msg;
1224         app_name_begin = m;
1225
1226         parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length,
1227             &procid_begin_offset, &procid_length);
1228         if (app_name_length == 0)
1229                 goto bad;
1230         procid_begin = procid_begin_offset == 0 ? NULL :
1231             app_name_begin + procid_begin_offset;
1232
1233         /* Split strings from input. */
1234         app_name_begin[app_name_length] = '\0';
1235         m += app_name_length + 1;
1236         if (procid_begin != NULL) {
1237                 procid_begin[procid_length] = '\0';
1238                 m += procid_length + 2;
1239         }
1240
1241         *msg = m + 1;
1242         *app_name = app_name_begin;
1243         *procid = procid_begin;
1244         return;
1245 bad:
1246         *app_name = NULL;
1247         *procid = NULL;
1248 }
1249
1250 /*
1251  * Parses a syslog message according to RFC 3164, assuming that PRI
1252  * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed
1253  * result is passed to logmsg().
1254  */
1255 static void
1256 parsemsg_rfc3164(const char *from, int pri, char *msg)
1257 {
1258         struct tm tm_parsed;
1259         const struct logtime *timestamp;
1260         struct logtime timestamp_remote;
1261         const char *app_name, *procid;
1262         size_t i, msglen;
1263         char line[MAXLINE + 1];
1264
1265         /*
1266          * Parse the TIMESTAMP provided by the remote side. If none is
1267          * found, assume this is not an RFC 3164 formatted message,
1268          * only containing a TAG and a MSG.
1269          */
1270         timestamp = NULL;
1271         if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) ==
1272             msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') {
1273                 msg += RFC3164_DATELEN + 1;
1274                 if (!RemoteAddDate) {
1275                         struct tm tm_now;
1276                         time_t t_now;
1277                         int year;
1278
1279                         /*
1280                          * As the timestamp does not contain the year
1281                          * number, daylight saving time information, nor
1282                          * a time zone, attempt to infer it. Due to
1283                          * clock skews, the timestamp may even be part
1284                          * of the next year. Use the last year for which
1285                          * the timestamp is at most one week in the
1286                          * future.
1287                          *
1288                          * This loop can only run for at most three
1289                          * iterations before terminating.
1290                          */
1291                         t_now = time(NULL);
1292                         localtime_r(&t_now, &tm_now);
1293                         for (year = tm_now.tm_year + 1;; --year) {
1294                                 assert(year >= tm_now.tm_year - 1);
1295                                 timestamp_remote.tm = tm_parsed;
1296                                 timestamp_remote.tm.tm_year = year;
1297                                 timestamp_remote.tm.tm_isdst = -1;
1298                                 timestamp_remote.usec = 0;
1299                                 if (mktime(&timestamp_remote.tm) <
1300                                     t_now + 7 * 24 * 60 * 60)
1301                                         break;
1302                         }
1303                         timestamp = &timestamp_remote;
1304                 }
1305
1306                 /*
1307                  * A single space character MUST also follow the HOSTNAME field.
1308                  */
1309                 msglen = strlen(msg);
1310                 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) {
1311                         if (msg[i] == ' ') {
1312                                 if (RemoteHostname) {
1313                                         msg[i] = '\0';
1314                                         from = msg;
1315                                 }
1316                                 msg += i + 1;
1317                                 break;
1318                         }
1319                         /*
1320                          * Support non RFC compliant messages, without hostname.
1321                          */
1322                         if (msg[i] == ':')
1323                                 break;
1324                 }
1325                 if (i == MIN(MAXHOSTNAMELEN, msglen)) {
1326                         dprintf("Invalid HOSTNAME from %s: %s\n", from, msg);
1327                         return;
1328                 }
1329         }
1330
1331         /* Remove the TAG, if present. */
1332         parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid);
1333         parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
1334         logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0);
1335 }
1336
1337 /*
1338  * Takes a raw input line, extracts PRI and determines whether the
1339  * message is formatted according to RFC 3164 or RFC 5424. Continues
1340  * parsing of addition fields in the message according to those
1341  * standards and prints the message on the appropriate log files.
1342  */
1343 static void
1344 parsemsg(const char *from, char *msg)
1345 {
1346         char *q;
1347         long n;
1348         size_t i;
1349         int pri;
1350
1351         /* Parse PRI. */
1352         if (msg[0] != '<' || !isdigit(msg[1])) {
1353                 dprintf("Invalid PRI from %s\n", from);
1354                 return;
1355         }
1356         for (i = 2; i <= 4; i++) {
1357                 if (msg[i] == '>')
1358                         break;
1359                 if (!isdigit(msg[i])) {
1360                         dprintf("Invalid PRI header from %s\n", from);
1361                         return;
1362                 }
1363         }
1364         if (msg[i] != '>') {
1365                 dprintf("Invalid PRI header from %s\n", from);
1366                 return;
1367         }
1368         errno = 0;
1369         n = strtol(msg + 1, &q, 10);
1370         if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) {
1371                 dprintf("Invalid PRI %ld from %s: %s\n",
1372                     n, from, strerror(errno));
1373                 return;
1374         }
1375         pri = n;
1376         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1377                 pri = DEFUPRI;
1378
1379         /*
1380          * Don't allow users to log kernel messages.
1381          * NOTE: since LOG_KERN == 0 this will also match
1382          *       messages with no facility specified.
1383          */
1384         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
1385                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
1386
1387         /* Parse VERSION. */
1388         msg += i + 1;
1389         if (msg[0] == '1' && msg[1] == ' ')
1390                 parsemsg_rfc5424(from, pri, msg + 2);
1391         else
1392                 parsemsg_rfc3164(from, pri, msg);
1393 }
1394
1395 /*
1396  * Read /dev/klog while data are available, split into lines.
1397  */
1398 static int
1399 socklist_recv_file(struct socklist *sl)
1400 {
1401         char *p, *q, line[MAXLINE + 1];
1402         int len, i;
1403
1404         len = 0;
1405         for (;;) {
1406                 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len);
1407                 if (i > 0) {
1408                         line[i + len] = '\0';
1409                 } else {
1410                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
1411                                 logerror("klog");
1412                                 close(sl->sl_socket);
1413                                 sl->sl_socket = -1;
1414                         }
1415                         break;
1416                 }
1417
1418                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
1419                         *q = '\0';
1420                         printsys(p);
1421                 }
1422                 len = strlen(p);
1423                 if (len >= MAXLINE - 1) {
1424                         printsys(p);
1425                         len = 0;
1426                 }
1427                 if (len > 0)
1428                         memmove(line, p, len + 1);
1429         }
1430         if (len > 0)
1431                 printsys(line);
1432
1433         return (len);
1434 }
1435
1436 /*
1437  * Take a raw input line from /dev/klog, format similar to syslog().
1438  */
1439 static void
1440 printsys(char *msg)
1441 {
1442         char *p, *q;
1443         long n;
1444         int flags, isprintf, pri;
1445
1446         flags = ISKERNEL | SYNC_FILE;   /* fsync after write */
1447         p = msg;
1448         pri = DEFSPRI;
1449         isprintf = 1;
1450         if (*p == '<') {
1451                 errno = 0;
1452                 n = strtol(p + 1, &q, 10);
1453                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
1454                         p = q + 1;
1455                         pri = n;
1456                         isprintf = 0;
1457                 }
1458         }
1459         /*
1460          * Kernel printf's and LOG_CONSOLE messages have been displayed
1461          * on the console already.
1462          */
1463         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
1464                 flags |= IGN_CONS;
1465         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1466                 pri = DEFSPRI;
1467         logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags);
1468 }
1469
1470 static time_t   now;
1471
1472 /*
1473  * Match a program or host name against a specification.
1474  * Return a non-0 value if the message must be ignored
1475  * based on the specification.
1476  */
1477 static int
1478 skip_message(const char *name, const char *spec, int checkcase)
1479 {
1480         const char *s;
1481         char prev, next;
1482         int exclude = 0;
1483         /* Behaviour on explicit match */
1484
1485         if (spec == NULL)
1486                 return 0;
1487         switch (*spec) {
1488         case '-':
1489                 exclude = 1;
1490                 /*FALLTHROUGH*/
1491         case '+':
1492                 spec++;
1493                 break;
1494         default:
1495                 break;
1496         }
1497         if (checkcase)
1498                 s = strstr (spec, name);
1499         else
1500                 s = strcasestr (spec, name);
1501
1502         if (s != NULL) {
1503                 prev = (s == spec ? ',' : *(s - 1));
1504                 next = *(s + strlen (name));
1505
1506                 if (prev == ',' && (next == '\0' || next == ','))
1507                         /* Explicit match: skip iff the spec is an
1508                            exclusive one. */
1509                         return exclude;
1510         }
1511
1512         /* No explicit match for this name: skip the message iff
1513            the spec is an inclusive one. */
1514         return !exclude;
1515 }
1516
1517 /*
1518  * Match some property of the message against a filter.
1519  * Return a non-0 value if the message must be ignored
1520  * based on the filter.
1521  */
1522 static int
1523 evaluate_prop_filter(const struct prop_filter *filter, const char *value)
1524 {
1525         const char *s = NULL;
1526         const int exclude = ((filter->cmp_flags & PROP_FLAG_EXCLUDE) > 0);
1527         size_t valuelen;
1528
1529         if (value == NULL)
1530                 return (-1);
1531
1532         if (filter->cmp_type == PROP_CMP_REGEX) {
1533                 if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0)
1534                         return (exclude);
1535                 else
1536                         return (!exclude);
1537         }
1538
1539         valuelen = strlen(value);
1540
1541         /* a shortcut for equal with different length is always false */
1542         if (filter->cmp_type == PROP_CMP_EQUAL &&
1543             valuelen != filter->pflt_strlen)
1544                 return (!exclude);
1545
1546         if (filter->cmp_flags & PROP_FLAG_ICASE)
1547                 s = strcasestr(value, filter->pflt_strval);
1548         else
1549                 s = strstr(value, filter->pflt_strval);
1550
1551         /*
1552          * PROP_CMP_CONTAINS    true if s
1553          * PROP_CMP_STARTS      true if s && s == value
1554          * PROP_CMP_EQUAL       true if s && s == value &&
1555          *                          valuelen == filter->pflt_strlen
1556          *                          (and length match is checked
1557          *                           already)
1558          */
1559
1560         switch (filter->cmp_type) {
1561         case PROP_CMP_STARTS:
1562         case PROP_CMP_EQUAL:
1563                 if (s != value)
1564                         return (!exclude);
1565         /* FALLTHROUGH */
1566         case PROP_CMP_CONTAINS:
1567                 if (s)
1568                         return (exclude);
1569                 else
1570                         return (!exclude);
1571                 break;
1572         default:
1573                 /* unknown cmp_type */
1574                 break;
1575         }
1576
1577         return (-1);
1578 }
1579
1580 /*
1581  * Logs a message to the appropriate log files, users, etc. based on the
1582  * priority. Log messages are always formatted according to RFC 3164,
1583  * even if they were in RFC 5424 format originally, The MSGID and
1584  * STRUCTURED-DATA fields are thus discarded for the time being.
1585  */
1586 static void
1587 logmsg(int pri, const struct logtime *timestamp, const char *hostname,
1588     const char *app_name, const char *procid, const char *msgid,
1589     const char *structured_data, const char *msg, int flags)
1590 {
1591         struct timeval tv;
1592         struct logtime timestamp_now;
1593         struct filed *f;
1594         size_t savedlen;
1595         int fac, prilev;
1596         char saved[MAXSVLINE], kernel_app_name[100];
1597
1598         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
1599             pri, flags, hostname, msg);
1600
1601         (void)gettimeofday(&tv, NULL);
1602         now = tv.tv_sec;
1603         if (timestamp == NULL) {
1604                 localtime_r(&now, &timestamp_now.tm);
1605                 timestamp_now.usec = tv.tv_usec;
1606                 timestamp = &timestamp_now;
1607         }
1608
1609         /* extract facility and priority level */
1610         if (flags & MARK)
1611                 fac = LOG_NFACILITIES;
1612         else
1613                 fac = LOG_FAC(pri);
1614
1615         /* Check maximum facility number. */
1616         if (fac > LOG_NFACILITIES)
1617                 return;
1618
1619         prilev = LOG_PRI(pri);
1620
1621         /*
1622          * Lookup kernel app name from log prefix if present.
1623          * This is only used for local program specification matching.
1624          */
1625         if (flags & ISKERNEL) {
1626                 size_t kernel_app_name_length;
1627
1628                 parsemsg_rfc3164_get_app_name_procid(msg,
1629                     &kernel_app_name_length, NULL, NULL);
1630                 if (kernel_app_name_length != 0) {
1631                         strlcpy(kernel_app_name, msg,
1632                             MIN(sizeof(kernel_app_name),
1633                             kernel_app_name_length + 1));
1634                 } else
1635                         kernel_app_name[0] = '\0';
1636         }
1637
1638         /* log the message to the particular outputs */
1639         if (!Initialized) {
1640                 f = &consfile;
1641                 /*
1642                  * Open in non-blocking mode to avoid hangs during open
1643                  * and close(waiting for the port to drain).
1644                  */
1645                 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
1646
1647                 if (f->f_file >= 0) {
1648                         f->f_lasttime = *timestamp;
1649                         fprintlog_first(f, hostname, app_name, procid, msgid,
1650                             structured_data, msg, flags);
1651                         close(f->f_file);
1652                         f->f_file = -1;
1653                 }
1654                 return;
1655         }
1656
1657         /*
1658          * Store all of the fields of the message, except the timestamp,
1659          * in a single string. This string is used to detect duplicate
1660          * messages.
1661          */
1662         assert(hostname != NULL);
1663         assert(msg != NULL);
1664         savedlen = snprintf(saved, sizeof(saved),
1665             "%d %s %s %s %s %s %s", pri, hostname,
1666             app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid,
1667             msgid == NULL ? "-" : msgid,
1668             structured_data == NULL ? "-" : structured_data, msg);
1669
1670         STAILQ_FOREACH(f, &fhead, next) {
1671                 /* skip messages that are incorrect priority */
1672                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
1673                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
1674                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
1675                      )
1676                     || f->f_pmask[fac] == INTERNAL_NOPRI)
1677                         continue;
1678
1679                 /* skip messages with the incorrect hostname */
1680                 if (skip_message(hostname, f->f_host, 0))
1681                         continue;
1682
1683                 /* skip messages with the incorrect program name */
1684                 if (flags & ISKERNEL && kernel_app_name[0] != '\0') {
1685                         if (skip_message(kernel_app_name, f->f_program, 1))
1686                                 continue;
1687                 } else if (skip_message(app_name == NULL ? "" : app_name,
1688                     f->f_program, 1))
1689                         continue;
1690
1691                 /* skip messages if a property does not match filter */
1692                 if (f->f_prop_filter != NULL &&
1693                     f->f_prop_filter->prop_type != PROP_TYPE_NOOP) {
1694                         switch (f->f_prop_filter->prop_type) {
1695                         case PROP_TYPE_MSG:
1696                                 if (evaluate_prop_filter(f->f_prop_filter,
1697                                     msg))
1698                                         continue;
1699                                 break;
1700                         case PROP_TYPE_HOSTNAME:
1701                                 if (evaluate_prop_filter(f->f_prop_filter,
1702                                     hostname))
1703                                         continue;
1704                                 break;
1705                         case PROP_TYPE_PROGNAME:
1706                                 if (evaluate_prop_filter(f->f_prop_filter,
1707                                     app_name == NULL ? "" : app_name))
1708                                         continue;
1709                                 break;
1710                         default:
1711                                 continue;
1712                         }
1713                 }
1714
1715                 /* skip message to console if it has already been printed */
1716                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1717                         continue;
1718
1719                 /* don't output marks to recently written files */
1720                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1721                         continue;
1722
1723                 /*
1724                  * suppress duplicate lines to this file
1725                  */
1726                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1727                     (flags & MARK) == 0 && savedlen == f->f_prevlen &&
1728                     strcmp(saved, f->f_prevline) == 0) {
1729                         f->f_lasttime = *timestamp;
1730                         f->f_prevcount++;
1731                         dprintf("msg repeated %d times, %ld sec of %d\n",
1732                             f->f_prevcount, (long)(now - f->f_time),
1733                             repeatinterval[f->f_repeatcount]);
1734                         /*
1735                          * If domark would have logged this by now,
1736                          * flush it now (so we don't hold isolated messages),
1737                          * but back off so we'll flush less often
1738                          * in the future.
1739                          */
1740                         if (now > REPEATTIME(f)) {
1741                                 fprintlog_successive(f, flags);
1742                                 BACKOFF(f);
1743                         }
1744                 } else {
1745                         /* new line, save it */
1746                         if (f->f_prevcount)
1747                                 fprintlog_successive(f, 0);
1748                         f->f_repeatcount = 0;
1749                         f->f_prevpri = pri;
1750                         f->f_lasttime = *timestamp;
1751                         static_assert(sizeof(f->f_prevline) == sizeof(saved),
1752                             "Space to store saved line incorrect");
1753                         (void)strcpy(f->f_prevline, saved);
1754                         f->f_prevlen = savedlen;
1755                         fprintlog_first(f, hostname, app_name, procid, msgid,
1756                             structured_data, msg, flags);
1757                 }
1758         }
1759 }
1760
1761 static void
1762 dofsync(void)
1763 {
1764         struct filed *f;
1765
1766         STAILQ_FOREACH(f, &fhead, next) {
1767                 if ((f->f_type == F_FILE) &&
1768                     (f->f_flags & FFLAG_NEEDSYNC)) {
1769                         f->f_flags &= ~FFLAG_NEEDSYNC;
1770                         (void)fsync(f->f_file);
1771                 }
1772         }
1773 }
1774
1775 /*
1776  * List of iovecs to which entries can be appended.
1777  * Used for constructing the message to be logged.
1778  */
1779 struct iovlist {
1780         struct iovec    iov[TTYMSG_IOV_MAX];
1781         size_t          iovcnt;
1782         size_t          totalsize;
1783 };
1784
1785 static void
1786 iovlist_init(struct iovlist *il)
1787 {
1788
1789         il->iovcnt = 0;
1790         il->totalsize = 0;
1791 }
1792
1793 static void
1794 iovlist_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)
1810 static void
1811 iovlist_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
1832 static void
1833 fprintlog_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                 /* Truncate messages to RFC 5426 recommended size. */
1844                 dprintf(" %s", f->fu_forw_hname);
1845                 switch (f->fu_forw_addr->ai_family) {
1846 #ifdef INET
1847                 case AF_INET:
1848                         dprintf(":%d\n",
1849                             ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port));
1850                         iovlist_truncate(il, 480);
1851                         break;
1852 #endif
1853 #ifdef INET6
1854                 case AF_INET6:
1855                         dprintf(":%d\n",
1856                             ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port));
1857                         iovlist_truncate(il, 1180);
1858                         break;
1859 #endif
1860                 default:
1861                         dprintf("\n");
1862                 }
1863
1864                 lsent = 0;
1865                 for (r = f->fu_forw_addr; r; r = r->ai_next) {
1866                         memset(&msghdr, 0, sizeof(msghdr));
1867                         msghdr.msg_name = r->ai_addr;
1868                         msghdr.msg_namelen = r->ai_addrlen;
1869                         msghdr.msg_iov = il->iov;
1870                         msghdr.msg_iovlen = il->iovcnt;
1871                         STAILQ_FOREACH(sl, &shead, next) {
1872                                 if (sl->sl_socket < 0)
1873                                         continue;
1874                                 if (sl->sl_sa == NULL ||
1875                                     sl->sl_family == AF_UNSPEC ||
1876                                     sl->sl_family == AF_LOCAL)
1877                                         continue;
1878                                 lsent = sendmsg(sl->sl_socket, &msghdr, 0);
1879                                 if (lsent == (ssize_t)il->totalsize)
1880                                         break;
1881                         }
1882                         if (lsent == (ssize_t)il->totalsize && !send_to_all)
1883                                 break;
1884                 }
1885                 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize);
1886                 if (lsent != (ssize_t)il->totalsize) {
1887                         int e = errno;
1888                         logerror("sendto");
1889                         errno = e;
1890                         switch (errno) {
1891                         case ENOBUFS:
1892                         case ENETDOWN:
1893                         case ENETUNREACH:
1894                         case EHOSTUNREACH:
1895                         case EHOSTDOWN:
1896                         case EADDRNOTAVAIL:
1897                                 break;
1898                         /* case EBADF: */
1899                         /* case EACCES: */
1900                         /* case ENOTSOCK: */
1901                         /* case EFAULT: */
1902                         /* case EMSGSIZE: */
1903                         /* case EAGAIN: */
1904                         /* case ENOBUFS: */
1905                         /* case ECONNREFUSED: */
1906                         default:
1907                                 dprintf("removing entry: errno=%d\n", e);
1908                                 f->f_type = F_UNUSED;
1909                                 break;
1910                         }
1911                 }
1912                 break;
1913
1914         case F_FILE:
1915                 dprintf(" %s\n", f->fu_fname);
1916                 iovlist_append(il, "\n");
1917                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1918                         /*
1919                          * If writev(2) fails for potentially transient errors
1920                          * like the filesystem being full, ignore it.
1921                          * Otherwise remove this logfile from the list.
1922                          */
1923                         if (errno != ENOSPC) {
1924                                 int e = errno;
1925                                 close_filed(f);
1926                                 errno = e;
1927                                 logerror(f->fu_fname);
1928                         }
1929                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1930                         f->f_flags |= FFLAG_NEEDSYNC;
1931                         needdofsync = 1;
1932                 }
1933                 break;
1934
1935         case F_PIPE:
1936                 dprintf(" %s\n", f->fu_pipe_pname);
1937                 iovlist_append(il, "\n");
1938                 if (f->fu_pipe_pid == 0) {
1939                         if ((f->f_file = p_open(f->fu_pipe_pname,
1940                                                 &f->fu_pipe_pid)) < 0) {
1941                                 logerror(f->fu_pipe_pname);
1942                                 break;
1943                         }
1944                 }
1945                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1946                         int e = errno;
1947
1948                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
1949                         close_filed(f);
1950                         errno = e;
1951                         logerror(f->fu_pipe_pname);
1952                 }
1953                 break;
1954
1955         case F_CONSOLE:
1956                 if (flags & IGN_CONS) {
1957                         dprintf(" (ignored)\n");
1958                         break;
1959                 }
1960                 /* FALLTHROUGH */
1961
1962         case F_TTY:
1963                 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname);
1964                 iovlist_append(il, "\r\n");
1965                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1966                 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) {
1967                         f->f_type = F_UNUSED;
1968                         logerror(msgret);
1969                 }
1970                 break;
1971
1972         case F_USERS:
1973         case F_WALL:
1974                 dprintf("\n");
1975                 iovlist_append(il, "\r\n");
1976                 wallmsg(f, il->iov, il->iovcnt);
1977                 break;
1978         }
1979 }
1980
1981 static void
1982 fprintlog_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
2031 static void
2032 fprintlog_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
2141 static void
2142 fprintlog_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  */
2166 static void
2167 fprintlog_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  */
2184 static void
2185 wallmsg(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  */
2228 static const char *
2229 ttymsg_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 static void
2249 reapchild(int signo __unused)
2250 {
2251         int status;
2252         pid_t pid;
2253         struct filed *f;
2254
2255         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
2256                 /* First, look if it's a process from the dead queue. */
2257                 if (deadq_removebypid(pid))
2258                         continue;
2259
2260                 /* Now, look in list of active processes. */
2261                 STAILQ_FOREACH(f, &fhead, next) {
2262                         if (f->f_type == F_PIPE &&
2263                             f->fu_pipe_pid == pid) {
2264                                 close_filed(f);
2265                                 log_deadchild(pid, status, f->fu_pipe_pname);
2266                                 break;
2267                         }
2268                 }
2269         }
2270         WantReapchild = 0;
2271 }
2272
2273 /*
2274  * Return a printable representation of a host address.
2275  */
2276 static const char *
2277 cvthname(struct sockaddr *f)
2278 {
2279         int error, hl;
2280         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
2281
2282         dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len);
2283         error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0,
2284                     NI_NUMERICHOST);
2285         if (error) {
2286                 dprintf("Malformed from address %s\n", gai_strerror(error));
2287                 return ("???");
2288         }
2289         dprintf("cvthname(%s)\n", ip);
2290
2291         if (!resolve)
2292                 return (ip);
2293
2294         error = getnameinfo(f, f->sa_len, hname, sizeof(hname),
2295                     NULL, 0, NI_NAMEREQD);
2296         if (error) {
2297                 dprintf("Host name for your address (%s) unknown\n", ip);
2298                 return (ip);
2299         }
2300         hl = strlen(hname);
2301         if (hl > 0 && hname[hl-1] == '.')
2302                 hname[--hl] = '\0';
2303         /* RFC 5424 prefers logging FQDNs. */
2304         if (RFC3164OutputFormat)
2305                 trimdomain(hname, hl);
2306         return (hname);
2307 }
2308
2309 static void
2310 dodie(int signo)
2311 {
2312
2313         WantDie = signo;
2314 }
2315
2316 static void
2317 domark(int signo __unused)
2318 {
2319
2320         MarkSet = 1;
2321 }
2322
2323 /*
2324  * Print syslogd errors some place.
2325  */
2326 static void
2327 logerror(const char *msg)
2328 {
2329         char buf[512];
2330         static int recursed = 0;
2331
2332         /* If there's an error while trying to log an error, give up. */
2333         if (recursed)
2334                 return;
2335         recursed++;
2336         if (errno != 0) {
2337                 (void)snprintf(buf, sizeof(buf), "%s: %s", msg,
2338                     strerror(errno));
2339                 msg = buf;
2340         }
2341         errno = 0;
2342         dprintf("%s\n", buf);
2343         logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL,
2344             NULL, msg, 0);
2345         recursed--;
2346 }
2347
2348 static void
2349 die(int signo)
2350 {
2351         struct filed *f;
2352         struct socklist *sl;
2353         char buf[100];
2354
2355         STAILQ_FOREACH(f, &fhead, next) {
2356                 /* flush any pending output */
2357                 if (f->f_prevcount)
2358                         fprintlog_successive(f, 0);
2359                 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0)
2360                         close_filed(f);
2361         }
2362         if (signo) {
2363                 dprintf("syslogd: exiting on signal %d\n", signo);
2364                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
2365                 errno = 0;
2366                 logerror(buf);
2367         }
2368         STAILQ_FOREACH(sl, &shead, next) {
2369                 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL)
2370                         unlink(sl->sl_peer->pe_name);
2371         }
2372         pidfile_remove(pfh);
2373
2374         exit(1);
2375 }
2376
2377 static int
2378 configfiles(const struct dirent *dp)
2379 {
2380         const char *p;
2381         size_t ext_len;
2382
2383         if (dp->d_name[0] == '.')
2384                 return (0);
2385
2386         ext_len = sizeof(include_ext) -1;
2387
2388         if (dp->d_namlen <= ext_len)
2389                 return (0);
2390
2391         p = &dp->d_name[dp->d_namlen - ext_len];
2392         if (strcmp(p, include_ext) != 0)
2393                 return (0);
2394
2395         return (1);
2396 }
2397
2398 static void
2399 readconfigfile(FILE *cf, int allow_includes)
2400 {
2401         FILE *cf2;
2402         struct filed *f;
2403         struct dirent **ent;
2404         char cline[LINE_MAX];
2405         char host[MAXHOSTNAMELEN];
2406         char prog[LINE_MAX];
2407         char file[MAXPATHLEN];
2408         char pfilter[LINE_MAX];
2409         char *p, *tmp;
2410         int i, nents;
2411         size_t include_len;
2412
2413         /*
2414          *  Foreach line in the conf table, open that file.
2415          */
2416         include_len = sizeof(include_str) -1;
2417         (void)strlcpy(host, "*", sizeof(host));
2418         (void)strlcpy(prog, "*", sizeof(prog));
2419         (void)strlcpy(pfilter, "*", sizeof(pfilter));
2420         while (fgets(cline, sizeof(cline), cf) != NULL) {
2421                 /*
2422                  * check for end-of-section, comments, strip off trailing
2423                  * spaces and newline character. #!prog is treated specially:
2424                  * following lines apply only to that program.
2425                  */
2426                 for (p = cline; isspace(*p); ++p)
2427                         continue;
2428                 if (*p == 0)
2429                         continue;
2430                 if (allow_includes &&
2431                     strncmp(p, include_str, include_len) == 0 &&
2432                     isspace(p[include_len])) {
2433                         p += include_len;
2434                         while (isspace(*p))
2435                                 p++;
2436                         tmp = p;
2437                         while (*tmp != '\0' && !isspace(*tmp))
2438                                 tmp++;
2439                         *tmp = '\0';
2440                         dprintf("Trying to include files in '%s'\n", p);
2441                         nents = scandir(p, &ent, configfiles, alphasort);
2442                         if (nents == -1) {
2443                                 dprintf("Unable to open '%s': %s\n", p,
2444                                     strerror(errno));
2445                                 continue;
2446                         }
2447                         for (i = 0; i < nents; i++) {
2448                                 if (snprintf(file, sizeof(file), "%s/%s", p,
2449                                     ent[i]->d_name) >= (int)sizeof(file)) {
2450                                         dprintf("ignoring path too long: "
2451                                             "'%s/%s'\n", p, ent[i]->d_name);
2452                                         free(ent[i]);
2453                                         continue;
2454                                 }
2455                                 free(ent[i]);
2456                                 cf2 = fopen(file, "r");
2457                                 if (cf2 == NULL)
2458                                         continue;
2459                                 dprintf("reading %s\n", file);
2460                                 readconfigfile(cf2, 0);
2461                                 fclose(cf2);
2462                         }
2463                         free(ent);
2464                         continue;
2465                 }
2466                 if (*p == '#') {
2467                         p++;
2468                         if (*p == '\0' || strchr("!+-:", *p) == NULL)
2469                                 continue;
2470                 }
2471                 if (*p == '+' || *p == '-') {
2472                         host[0] = *p++;
2473                         while (isspace(*p))
2474                                 p++;
2475                         if ((!*p) || (*p == '*')) {
2476                                 (void)strlcpy(host, "*", sizeof(host));
2477                                 continue;
2478                         }
2479                         if (*p == '@')
2480                                 p = LocalHostName;
2481                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
2482                                 if (!isalnum(*p) && *p != '.' && *p != '-'
2483                                     && *p != ',' && *p != ':' && *p != '%')
2484                                         break;
2485                                 host[i] = *p++;
2486                         }
2487                         host[i] = '\0';
2488                         continue;
2489                 }
2490                 if (*p == '!') {
2491                         p++;
2492                         while (isspace(*p)) p++;
2493                         if ((!*p) || (*p == '*')) {
2494                                 (void)strlcpy(prog, "*", sizeof(prog));
2495                                 continue;
2496                         }
2497                         for (i = 0; i < LINE_MAX - 1; i++) {
2498                                 if (!isprint(p[i]) || isspace(p[i]))
2499                                         break;
2500                                 prog[i] = p[i];
2501                         }
2502                         prog[i] = 0;
2503                         continue;
2504                 }
2505                 if (*p == ':') {
2506                         p++;
2507                         while (isspace(*p))
2508                                 p++;
2509                         if ((!*p) || (*p == '*')) {
2510                                 (void)strlcpy(pfilter, "*", sizeof(pfilter));
2511                                 continue;
2512                         }
2513                         (void)strlcpy(pfilter, p, sizeof(pfilter));
2514                         continue;
2515                 }
2516                 for (p = cline + 1; *p != '\0'; p++) {
2517                         if (*p != '#')
2518                                 continue;
2519                         if (*(p - 1) == '\\') {
2520                                 strcpy(p - 1, p);
2521                                 p--;
2522                                 continue;
2523                         }
2524                         *p = '\0';
2525                         break;
2526                 }
2527                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
2528                         cline[i] = '\0';
2529                 f = cfline(cline, prog, host, pfilter);
2530                 if (f != NULL)
2531                         addfile(f);
2532                 free(f);
2533         }
2534 }
2535
2536 static void
2537 sighandler(int signo)
2538 {
2539
2540         /* Send an wake-up signal to the select() loop. */
2541         write(sigpipe[1], &signo, sizeof(signo));
2542 }
2543
2544 /*
2545  *  INIT -- Initialize syslogd from configuration table
2546  */
2547 static void
2548 init(int signo)
2549 {
2550         int i;
2551         FILE *cf;
2552         struct filed *f;
2553         char *p;
2554         char oldLocalHostName[MAXHOSTNAMELEN];
2555         char hostMsg[2*MAXHOSTNAMELEN+40];
2556         char bootfileMsg[LINE_MAX];
2557
2558         dprintf("init\n");
2559         WantInitialize = 0;
2560
2561         /*
2562          * Load hostname (may have changed).
2563          */
2564         if (signo != 0)
2565                 (void)strlcpy(oldLocalHostName, LocalHostName,
2566                     sizeof(oldLocalHostName));
2567         if (gethostname(LocalHostName, sizeof(LocalHostName)))
2568                 err(EX_OSERR, "gethostname() failed");
2569         if ((p = strchr(LocalHostName, '.')) != NULL) {
2570                 /* RFC 5424 prefers logging FQDNs. */
2571                 if (RFC3164OutputFormat)
2572                         *p = '\0';
2573                 LocalDomain = p + 1;
2574         } else {
2575                 LocalDomain = "";
2576         }
2577
2578         /*
2579          * Load / reload timezone data (in case it changed).
2580          *
2581          * Just calling tzset() again does not work, the timezone code
2582          * caches the result.  However, by setting the TZ variable, one
2583          * can defeat the caching and have the timezone code really
2584          * reload the timezone data.  Respect any initial setting of
2585          * TZ, in case the system is configured specially.
2586          */
2587         dprintf("loading timezone data via tzset()\n");
2588         if (getenv("TZ")) {
2589                 tzset();
2590         } else {
2591                 setenv("TZ", ":/etc/localtime", 1);
2592                 tzset();
2593                 unsetenv("TZ");
2594         }
2595
2596         /*
2597          *  Close all open log files.
2598          */
2599         Initialized = 0;
2600         STAILQ_FOREACH(f, &fhead, next) {
2601                 /* flush any pending output */
2602                 if (f->f_prevcount)
2603                         fprintlog_successive(f, 0);
2604
2605                 switch (f->f_type) {
2606                 case F_FILE:
2607                 case F_FORW:
2608                 case F_CONSOLE:
2609                 case F_TTY:
2610                         close_filed(f);
2611                         break;
2612                 case F_PIPE:
2613                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
2614                         close_filed(f);
2615                         break;
2616                 }
2617         }
2618         while(!STAILQ_EMPTY(&fhead)) {
2619                 f = STAILQ_FIRST(&fhead);
2620                 STAILQ_REMOVE_HEAD(&fhead, next);
2621                 free(f->f_program);
2622                 free(f->f_host);
2623                 if (f->f_prop_filter) {
2624                         switch (f->f_prop_filter->cmp_type) {
2625                         case PROP_CMP_REGEX:
2626                                 regfree(f->f_prop_filter->pflt_re);
2627                                 free(f->f_prop_filter->pflt_re);
2628                                 break;
2629                         case PROP_CMP_CONTAINS:
2630                         case PROP_CMP_EQUAL:
2631                         case PROP_CMP_STARTS:
2632                                 free(f->f_prop_filter->pflt_strval);
2633                                 break;
2634                         }
2635                         free(f->f_prop_filter);
2636                 }
2637                 free(f);
2638         }
2639
2640         /* open the configuration file */
2641         if ((cf = fopen(ConfFile, "r")) == NULL) {
2642                 dprintf("cannot open %s\n", ConfFile);
2643                 f = cfline("*.ERR\t/dev/console", "*", "*", "*");
2644                 if (f != NULL)
2645                         addfile(f);
2646                 free(f);
2647                 f = cfline("*.PANIC\t*", "*", "*", "*");
2648                 if (f != NULL)
2649                         addfile(f);
2650                 free(f);
2651                 Initialized = 1;
2652
2653                 return;
2654         }
2655
2656         readconfigfile(cf, 1);
2657
2658         /* close the configuration file */
2659         (void)fclose(cf);
2660
2661         Initialized = 1;
2662
2663         if (Debug) {
2664                 int port;
2665                 STAILQ_FOREACH(f, &fhead, next) {
2666                         for (i = 0; i <= LOG_NFACILITIES; i++)
2667                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
2668                                         printf("X ");
2669                                 else
2670                                         printf("%d ", f->f_pmask[i]);
2671                         printf("%s: ", TypeNames[f->f_type]);
2672                         switch (f->f_type) {
2673                         case F_FILE:
2674                                 printf("%s", f->fu_fname);
2675                                 break;
2676
2677                         case F_CONSOLE:
2678                         case F_TTY:
2679                                 printf("%s%s", _PATH_DEV, f->fu_fname);
2680                                 break;
2681
2682                         case F_FORW:
2683                                 switch (f->fu_forw_addr->ai_family) {
2684 #ifdef INET
2685                                 case AF_INET:
2686                                         port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port);
2687                                         break;
2688 #endif
2689 #ifdef INET6
2690                                 case AF_INET6:
2691                                         port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port);
2692                                         break;
2693 #endif
2694                                 default:
2695                                         port = 0;
2696                                 }
2697                                 if (port != 514) {
2698                                         printf("%s:%d",
2699                                                 f->fu_forw_hname, port);
2700                                 } else {
2701                                         printf("%s", f->fu_forw_hname);
2702                                 }
2703                                 break;
2704
2705                         case F_PIPE:
2706                                 printf("%s", f->fu_pipe_pname);
2707                                 break;
2708
2709                         case F_USERS:
2710                                 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++)
2711                                         printf("%s, ", f->fu_uname[i]);
2712                                 break;
2713                         }
2714                         if (f->f_program)
2715                                 printf(" (%s)", f->f_program);
2716                         printf("\n");
2717                 }
2718         }
2719
2720         logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL,
2721             NULL, NULL, "restart", 0);
2722         dprintf("syslogd: restarted\n");
2723         /*
2724          * Log a change in hostname, but only on a restart.
2725          */
2726         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
2727                 (void)snprintf(hostMsg, sizeof(hostMsg),
2728                     "hostname changed, \"%s\" to \"%s\"",
2729                     oldLocalHostName, LocalHostName);
2730                 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd",
2731                     NULL, NULL, NULL, hostMsg, 0);
2732                 dprintf("%s\n", hostMsg);
2733         }
2734         /*
2735          * Log the kernel boot file if we aren't going to use it as
2736          * the prefix, and if this is *not* a restart.
2737          */
2738         if (signo == 0 && !use_bootfile) {
2739                 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
2740                     "kernel boot file is %s", bootfile);
2741                 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd",
2742                     NULL, NULL, NULL, bootfileMsg, 0);
2743                 dprintf("%s\n", bootfileMsg);
2744         }
2745 }
2746
2747 /*
2748  * Compile property-based filter.
2749  * Returns 0 on success, -1 otherwise.
2750  */
2751 static int
2752 prop_filter_compile(struct prop_filter *pfilter, char *filter)
2753 {
2754         char *filter_endpos, *p;
2755         char **ap, *argv[2] = {NULL, NULL};
2756         int re_flags = REG_NOSUB;
2757         int escaped;
2758
2759         bzero(pfilter, sizeof(struct prop_filter));
2760
2761         /*
2762          * Here's some filter examples mentioned in syslog.conf(5)
2763          * 'msg, contains, ".*Deny.*"'
2764          * 'programname, regex, "^bird6?$"'
2765          * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"'
2766          */
2767
2768         /*
2769          * Split filter into 3 parts: property name (argv[0]),
2770          * cmp type (argv[1]) and lvalue for comparison (filter).
2771          */
2772         for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) {
2773                 if (**ap != '\0')
2774                         if (++ap >= &argv[2])
2775                                 break;
2776         }
2777
2778         if (argv[0] == NULL || argv[1] == NULL) {
2779                 logerror("filter parse error");
2780                 return (-1);
2781         }
2782
2783         /* fill in prop_type */
2784         if (strcasecmp(argv[0], "msg") == 0)
2785                 pfilter->prop_type = PROP_TYPE_MSG;
2786         else if(strcasecmp(argv[0], "hostname") == 0)
2787                 pfilter->prop_type = PROP_TYPE_HOSTNAME;
2788         else if(strcasecmp(argv[0], "source") == 0)
2789                 pfilter->prop_type = PROP_TYPE_HOSTNAME;
2790         else if(strcasecmp(argv[0], "programname") == 0)
2791                 pfilter->prop_type = PROP_TYPE_PROGNAME;
2792         else {
2793                 logerror("unknown property");
2794                 return (-1);
2795         }
2796
2797         /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */
2798         if (*argv[1] == '!') {
2799                 pfilter->cmp_flags |= PROP_FLAG_EXCLUDE;
2800                 argv[1]++;
2801         }
2802         if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) {
2803                 pfilter->cmp_flags |= PROP_FLAG_ICASE;
2804                 argv[1] += sizeof("icase_") - 1;
2805         }
2806
2807         /* fill in cmp_type */
2808         if (strcasecmp(argv[1], "contains") == 0)
2809                 pfilter->cmp_type = PROP_CMP_CONTAINS;
2810         else if (strcasecmp(argv[1], "isequal") == 0)
2811                 pfilter->cmp_type = PROP_CMP_EQUAL;
2812         else if (strcasecmp(argv[1], "startswith") == 0)
2813                 pfilter->cmp_type = PROP_CMP_STARTS;
2814         else if (strcasecmp(argv[1], "regex") == 0)
2815                 pfilter->cmp_type = PROP_CMP_REGEX;
2816         else if (strcasecmp(argv[1], "ereregex") == 0) {
2817                 pfilter->cmp_type = PROP_CMP_REGEX;
2818                 re_flags |= REG_EXTENDED;
2819         } else {
2820                 logerror("unknown cmp function");
2821                 return (-1);
2822         }
2823
2824         /*
2825          * Handle filter value
2826          */
2827
2828         /* ' ".*Deny.*"' */
2829         /* remove leading whitespace and check for '"' next character  */
2830         filter += strspn(filter, ", \t\n");
2831         if (*filter != '"' || strlen(filter) < 3) {
2832                 logerror("property value parse error");
2833                 return (-1);
2834         }
2835         filter++;
2836
2837         /* '.*Deny.*"' */
2838         /* process possible backslash (\") escaping */
2839         escaped = 0;
2840         filter_endpos = filter;
2841         for (p = filter; *p != '\0'; p++) {
2842                 if (*p == '\\' && !escaped) {
2843                         escaped = 1;
2844                         /* do not shift filter_endpos */
2845                         continue;
2846                 }
2847                 if (*p == '"' && !escaped) {
2848                         p++;
2849                         break;
2850                 }
2851                 /* we've seen some esc symbols, need to compress the line */
2852                 if (filter_endpos != p)
2853                         *filter_endpos = *p;
2854
2855                 filter_endpos++;
2856                 escaped = 0;
2857         }
2858
2859         *filter_endpos = '\0';
2860         /* '.*Deny.*' */
2861
2862         /* We should not have anything but whitespace left after closing '"' */
2863         if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) {
2864                 logerror("property value parse error");
2865                 return (-1);
2866         }
2867
2868         if (pfilter->cmp_type == PROP_CMP_REGEX) {
2869                 pfilter->pflt_re = calloc(1, sizeof(*pfilter->pflt_re));
2870                 if (pfilter->pflt_re == NULL) {
2871                         logerror("RE calloc() error");
2872                         free(pfilter->pflt_re);
2873                         return (-1);
2874                 }
2875                 if (pfilter->cmp_flags & PROP_FLAG_ICASE)
2876                         re_flags |= REG_ICASE;
2877                 if (regcomp(pfilter->pflt_re, filter, re_flags) != 0) {
2878                         logerror("RE compilation error");
2879                         free(pfilter->pflt_re);
2880                         return (-1);
2881                 }
2882         } else {
2883                 pfilter->pflt_strval = strdup(filter);
2884                 pfilter->pflt_strlen = strlen(filter);
2885         }
2886
2887         return (0);
2888
2889 }
2890
2891 /*
2892  * Crack a configuration file line
2893  */
2894 static struct filed *
2895 cfline(const char *line, const char *prog, const char *host,
2896     const char *pfilter)
2897 {
2898         struct filed *f;
2899         struct addrinfo hints, *res;
2900         int error, i, pri, syncfile;
2901         const char *p, *q;
2902         char *bp, *pfilter_dup;
2903         char buf[MAXLINE], ebuf[100];
2904
2905         dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog,
2906             host, pfilter);
2907
2908         f = calloc(1, sizeof(*f));
2909         if (f == NULL) {
2910                 logerror("malloc");
2911                 exit(1);
2912         }
2913         errno = 0;      /* keep strerror() stuff out of logerror messages */
2914
2915         for (i = 0; i <= LOG_NFACILITIES; i++)
2916                 f->f_pmask[i] = INTERNAL_NOPRI;
2917
2918         /* save hostname if any */
2919         if (host && *host == '*')
2920                 host = NULL;
2921         if (host) {
2922                 int hl;
2923
2924                 f->f_host = strdup(host);
2925                 if (f->f_host == NULL) {
2926                         logerror("strdup");
2927                         exit(1);
2928                 }
2929                 hl = strlen(f->f_host);
2930                 if (hl > 0 && f->f_host[hl-1] == '.')
2931                         f->f_host[--hl] = '\0';
2932                 /* RFC 5424 prefers logging FQDNs. */
2933                 if (RFC3164OutputFormat)
2934                         trimdomain(f->f_host, hl);
2935         }
2936
2937         /* save program name if any */
2938         if (prog && *prog == '*')
2939                 prog = NULL;
2940         if (prog) {
2941                 f->f_program = strdup(prog);
2942                 if (f->f_program == NULL) {
2943                         logerror("strdup");
2944                         exit(1);
2945                 }
2946         }
2947
2948         if (pfilter) {
2949                 f->f_prop_filter = calloc(1, sizeof(*(f->f_prop_filter)));
2950                 if (f->f_prop_filter == NULL) {
2951                         logerror("pfilter calloc");
2952                         exit(1);
2953                 }
2954                 if (*pfilter == '*')
2955                         f->f_prop_filter->prop_type = PROP_TYPE_NOOP;
2956                 else {
2957                         pfilter_dup = strdup(pfilter);
2958                         if (pfilter_dup == NULL) {
2959                                 logerror("strdup");
2960                                 exit(1);
2961                         }
2962                         if (prop_filter_compile(f->f_prop_filter, pfilter_dup)) {
2963                                 logerror("filter compile error");
2964                                 exit(1);
2965                         }
2966                 }
2967         }
2968
2969         /* scan through the list of selectors */
2970         for (p = line; *p && *p != '\t' && *p != ' ';) {
2971                 int pri_done;
2972                 int pri_cmp;
2973                 int pri_invert;
2974
2975                 /* find the end of this facility name list */
2976                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
2977                         continue;
2978
2979                 /* get the priority comparison */
2980                 pri_cmp = 0;
2981                 pri_done = 0;
2982                 pri_invert = 0;
2983                 if (*q == '!') {
2984                         pri_invert = 1;
2985                         q++;
2986                 }
2987                 while (!pri_done) {
2988                         switch (*q) {
2989                         case '<':
2990                                 pri_cmp |= PRI_LT;
2991                                 q++;
2992                                 break;
2993                         case '=':
2994                                 pri_cmp |= PRI_EQ;
2995                                 q++;
2996                                 break;
2997                         case '>':
2998                                 pri_cmp |= PRI_GT;
2999                                 q++;
3000                                 break;
3001                         default:
3002                                 pri_done++;
3003                                 break;
3004                         }
3005                 }
3006
3007                 /* collect priority name */
3008                 for (bp = buf; *q && !strchr("\t,; ", *q); )
3009                         *bp++ = *q++;
3010                 *bp = '\0';
3011
3012                 /* skip cruft */
3013                 while (strchr(",;", *q))
3014                         q++;
3015
3016                 /* decode priority name */
3017                 if (*buf == '*') {
3018                         pri = LOG_PRIMASK;
3019                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
3020                 } else {
3021                         /* Ignore trailing spaces. */
3022                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
3023                                 buf[i] = '\0';
3024
3025                         pri = decode(buf, prioritynames);
3026                         if (pri < 0) {
3027                                 errno = 0;
3028                                 (void)snprintf(ebuf, sizeof ebuf,
3029                                     "unknown priority name \"%s\"", buf);
3030                                 logerror(ebuf);
3031                                 free(f);
3032                                 return (NULL);
3033                         }
3034                 }
3035                 if (!pri_cmp)
3036                         pri_cmp = (UniquePriority)
3037                                   ? (PRI_EQ)
3038                                   : (PRI_EQ | PRI_GT)
3039                                   ;
3040                 if (pri_invert)
3041                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
3042
3043                 /* scan facilities */
3044                 while (*p && !strchr("\t.; ", *p)) {
3045                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
3046                                 *bp++ = *p++;
3047                         *bp = '\0';
3048
3049                         if (*buf == '*') {
3050                                 for (i = 0; i < LOG_NFACILITIES; i++) {
3051                                         f->f_pmask[i] = pri;
3052                                         f->f_pcmp[i] = pri_cmp;
3053                                 }
3054                         } else {
3055                                 i = decode(buf, facilitynames);
3056                                 if (i < 0) {
3057                                         errno = 0;
3058                                         (void)snprintf(ebuf, sizeof ebuf,
3059                                             "unknown facility name \"%s\"",
3060                                             buf);
3061                                         logerror(ebuf);
3062                                         free(f);
3063                                         return (NULL);
3064                                 }
3065                                 f->f_pmask[i >> 3] = pri;
3066                                 f->f_pcmp[i >> 3] = pri_cmp;
3067                         }
3068                         while (*p == ',' || *p == ' ')
3069                                 p++;
3070                 }
3071
3072                 p = q;
3073         }
3074
3075         /* skip to action part */
3076         while (*p == '\t' || *p == ' ')
3077                 p++;
3078
3079         if (*p == '-') {
3080                 syncfile = 0;
3081                 p++;
3082         } else
3083                 syncfile = 1;
3084
3085         switch (*p) {
3086         case '@':
3087                 {
3088                         char *tp;
3089                         char endkey = ':';
3090                         /*
3091                          * scan forward to see if there is a port defined.
3092                          * so we can't use strlcpy..
3093                          */
3094                         i = sizeof(f->fu_forw_hname);
3095                         tp = f->fu_forw_hname;
3096                         p++;
3097
3098                         /*
3099                          * an ipv6 address should start with a '[' in that case
3100                          * we should scan for a ']'
3101                          */
3102                         if (*p == '[') {
3103                                 p++;
3104                                 endkey = ']';
3105                         }
3106                         while (*p && (*p != endkey) && (i-- > 0)) {
3107                                 *tp++ = *p++;
3108                         }
3109                         if (endkey == ']' && *p == endkey)
3110                                 p++;
3111                         *tp = '\0';
3112                 }
3113                 /* See if we copied a domain and have a port */
3114                 if (*p == ':')
3115                         p++;
3116                 else
3117                         p = NULL;
3118
3119                 hints = (struct addrinfo){
3120                         .ai_family = family,
3121                         .ai_socktype = SOCK_DGRAM
3122                 };
3123                 error = getaddrinfo(f->fu_forw_hname,
3124                                 p ? p : "syslog", &hints, &res);
3125                 if (error) {
3126                         logerror(gai_strerror(error));
3127                         break;
3128                 }
3129                 f->fu_forw_addr = res;
3130                 f->f_type = F_FORW;
3131                 break;
3132
3133         case '/':
3134                 if ((f->f_file = open(p, logflags, 0600)) < 0) {
3135                         f->f_type = F_UNUSED;
3136                         logerror(p);
3137                         break;
3138                 }
3139                 if (syncfile)
3140                         f->f_flags |= FFLAG_SYNC;
3141                 if (isatty(f->f_file)) {
3142                         if (strcmp(p, ctty) == 0)
3143                                 f->f_type = F_CONSOLE;
3144                         else
3145                                 f->f_type = F_TTY;
3146                         (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1,
3147                             sizeof(f->fu_fname));
3148                 } else {
3149                         (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname));
3150                         f->f_type = F_FILE;
3151                 }
3152                 break;
3153
3154         case '|':
3155                 f->fu_pipe_pid = 0;
3156                 (void)strlcpy(f->fu_pipe_pname, p + 1,
3157                     sizeof(f->fu_pipe_pname));
3158                 f->f_type = F_PIPE;
3159                 break;
3160
3161         case '*':
3162                 f->f_type = F_WALL;
3163                 break;
3164
3165         default:
3166                 for (i = 0; i < MAXUNAMES && *p; i++) {
3167                         for (q = p; *q && *q != ','; )
3168                                 q++;
3169                         (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1);
3170                         if ((q - p) >= MAXLOGNAME)
3171                                 f->fu_uname[i][MAXLOGNAME - 1] = '\0';
3172                         else
3173                                 f->fu_uname[i][q - p] = '\0';
3174                         while (*q == ',' || *q == ' ')
3175                                 q++;
3176                         p = q;
3177                 }
3178                 f->f_type = F_USERS;
3179                 break;
3180         }
3181         return (f);
3182 }
3183
3184
3185 /*
3186  *  Decode a symbolic name to a numeric value
3187  */
3188 static int
3189 decode(const char *name, const CODE *codetab)
3190 {
3191         const CODE *c;
3192         char *p, buf[40];
3193
3194         if (isdigit(*name))
3195                 return (atoi(name));
3196
3197         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
3198                 if (isupper(*name))
3199                         *p = tolower(*name);
3200                 else
3201                         *p = *name;
3202         }
3203         *p = '\0';
3204         for (c = codetab; c->c_name; c++)
3205                 if (!strcmp(buf, c->c_name))
3206                         return (c->c_val);
3207
3208         return (-1);
3209 }
3210
3211 static void
3212 markit(void)
3213 {
3214         struct filed *f;
3215         struct deadq_entry *dq, *dq0;
3216
3217         now = time((time_t *)NULL);
3218         MarkSeq += TIMERINTVL;
3219         if (MarkSeq >= MarkInterval) {
3220                 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL,
3221                     "-- MARK --", MARK);
3222                 MarkSeq = 0;
3223         }
3224
3225         STAILQ_FOREACH(f, &fhead, next) {
3226                 if (f->f_prevcount && now >= REPEATTIME(f)) {
3227                         dprintf("flush %s: repeated %d times, %d sec.\n",
3228                             TypeNames[f->f_type], f->f_prevcount,
3229                             repeatinterval[f->f_repeatcount]);
3230                         fprintlog_successive(f, 0);
3231                         BACKOFF(f);
3232                 }
3233         }
3234
3235         /* Walk the dead queue, and see if we should signal somebody. */
3236         TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) {
3237                 switch (dq->dq_timeout) {
3238                 case 0:
3239                         /* Already signalled once, try harder now. */
3240                         if (kill(dq->dq_pid, SIGKILL) != 0)
3241                                 (void)deadq_remove(dq);
3242                         break;
3243
3244                 case 1:
3245                         /*
3246                          * Timed out on dead queue, send terminate
3247                          * signal.  Note that we leave the removal
3248                          * from the dead queue to reapchild(), which
3249                          * will also log the event (unless the process
3250                          * didn't even really exist, in case we simply
3251                          * drop it from the dead queue).
3252                          */
3253                         if (kill(dq->dq_pid, SIGTERM) != 0)
3254                                 (void)deadq_remove(dq);
3255                         else
3256                                 dq->dq_timeout--;
3257                         break;
3258                 default:
3259                         dq->dq_timeout--;
3260                 }
3261         }
3262         MarkSet = 0;
3263         (void)alarm(TIMERINTVL);
3264 }
3265
3266 /*
3267  * fork off and become a daemon, but wait for the child to come online
3268  * before returning to the parent, or we get disk thrashing at boot etc.
3269  * Set a timer so we don't hang forever if it wedges.
3270  */
3271 static int
3272 waitdaemon(int maxwait)
3273 {
3274         int fd;
3275         int status;
3276         pid_t pid, childpid;
3277
3278         switch (childpid = fork()) {
3279         case -1:
3280                 return (-1);
3281         case 0:
3282                 break;
3283         default:
3284                 signal(SIGALRM, timedout);
3285                 alarm(maxwait);
3286                 while ((pid = wait3(&status, 0, NULL)) != -1) {
3287                         if (WIFEXITED(status))
3288                                 errx(1, "child pid %d exited with return code %d",
3289                                         pid, WEXITSTATUS(status));
3290                         if (WIFSIGNALED(status))
3291                                 errx(1, "child pid %d exited on signal %d%s",
3292                                         pid, WTERMSIG(status),
3293                                         WCOREDUMP(status) ? " (core dumped)" :
3294                                         "");
3295                         if (pid == childpid)    /* it's gone... */
3296                                 break;
3297                 }
3298                 exit(0);
3299         }
3300
3301         if (setsid() == -1)
3302                 return (-1);
3303
3304         (void)chdir("/");
3305         if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
3306                 (void)dup2(fd, STDIN_FILENO);
3307                 (void)dup2(fd, STDOUT_FILENO);
3308                 (void)dup2(fd, STDERR_FILENO);
3309                 if (fd > STDERR_FILENO)
3310                         (void)close(fd);
3311         }
3312         return (getppid());
3313 }
3314
3315 /*
3316  * We get a SIGALRM from the child when it's running and finished doing it's
3317  * fsync()'s or O_SYNC writes for all the boot messages.
3318  *
3319  * We also get a signal from the kernel if the timer expires, so check to
3320  * see what happened.
3321  */
3322 static void
3323 timedout(int sig __unused)
3324 {
3325         int left;
3326         left = alarm(0);
3327         signal(SIGALRM, SIG_DFL);
3328         if (left == 0)
3329                 errx(1, "timed out waiting for child");
3330         else
3331                 _exit(0);
3332 }
3333
3334 /*
3335  * Add `s' to the list of allowable peer addresses to accept messages
3336  * from.
3337  *
3338  * `s' is a string in the form:
3339  *
3340  *    [*]domainname[:{servicename|portnumber|*}]
3341  *
3342  * or
3343  *
3344  *    netaddr/maskbits[:{servicename|portnumber|*}]
3345  *
3346  * Returns -1 on error, 0 if the argument was valid.
3347  */
3348 static int
3349 #if defined(INET) || defined(INET6)
3350 allowaddr(char *s)
3351 #else
3352 allowaddr(char *s __unused)
3353 #endif
3354 {
3355 #if defined(INET) || defined(INET6)
3356         char *cp1, *cp2;
3357         struct allowedpeer *ap;
3358         struct servent *se;
3359         int masklen = -1;
3360         struct addrinfo hints, *res = NULL;
3361 #ifdef INET
3362         in_addr_t *addrp, *maskp;
3363 #endif
3364 #ifdef INET6
3365         uint32_t *addr6p, *mask6p;
3366 #endif
3367         char ip[NI_MAXHOST];
3368
3369         ap = calloc(1, sizeof(*ap));
3370         if (ap == NULL)
3371                 err(1, "malloc failed");
3372
3373 #ifdef INET6
3374         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
3375 #endif
3376                 cp1 = s;
3377         if ((cp1 = strrchr(cp1, ':'))) {
3378                 /* service/port provided */
3379                 *cp1++ = '\0';
3380                 if (strlen(cp1) == 1 && *cp1 == '*')
3381                         /* any port allowed */
3382                         ap->port = 0;
3383                 else if ((se = getservbyname(cp1, "udp"))) {
3384                         ap->port = ntohs(se->s_port);
3385                 } else {
3386                         ap->port = strtol(cp1, &cp2, 0);
3387                         /* port not numeric */
3388                         if (*cp2 != '\0')
3389                                 goto err;
3390                 }
3391         } else {
3392                 if ((se = getservbyname("syslog", "udp")))
3393                         ap->port = ntohs(se->s_port);
3394                 else
3395                         /* sanity, should not happen */
3396                         ap->port = 514;
3397         }
3398
3399         if ((cp1 = strchr(s, '/')) != NULL &&
3400             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
3401                 *cp1 = '\0';
3402                 if ((masklen = atoi(cp1 + 1)) < 0)
3403                         goto err;
3404         }
3405 #ifdef INET6
3406         if (*s == '[') {
3407                 cp2 = s + strlen(s) - 1;
3408                 if (*cp2 == ']') {
3409                         ++s;
3410                         *cp2 = '\0';
3411                 } else {
3412                         cp2 = NULL;
3413                 }
3414         } else {
3415                 cp2 = NULL;
3416         }
3417 #endif
3418         hints = (struct addrinfo){
3419                 .ai_family = PF_UNSPEC,
3420                 .ai_socktype = SOCK_DGRAM,
3421                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3422         };
3423         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
3424                 ap->isnumeric = 1;
3425                 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen);
3426                 ap->a_mask = (struct sockaddr_storage){
3427                         .ss_family = res->ai_family,
3428                         .ss_len = res->ai_addrlen
3429                 };
3430                 switch (res->ai_family) {
3431 #ifdef INET
3432                 case AF_INET:
3433                         maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr;
3434                         addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr;
3435                         if (masklen < 0) {
3436                                 /* use default netmask */
3437                                 if (IN_CLASSA(ntohl(*addrp)))
3438                                         *maskp = htonl(IN_CLASSA_NET);
3439                                 else if (IN_CLASSB(ntohl(*addrp)))
3440                                         *maskp = htonl(IN_CLASSB_NET);
3441                                 else
3442                                         *maskp = htonl(IN_CLASSC_NET);
3443                         } else if (masklen == 0) {
3444                                 *maskp = 0;
3445                         } else if (masklen <= 32) {
3446                                 /* convert masklen to netmask */
3447                                 *maskp = htonl(~((1 << (32 - masklen)) - 1));
3448                         } else {
3449                                 goto err;
3450                         }
3451                         /* Lose any host bits in the network number. */
3452                         *addrp &= *maskp;
3453                         break;
3454 #endif
3455 #ifdef INET6
3456                 case AF_INET6:
3457                         if (masklen > 128)
3458                                 goto err;
3459
3460                         if (masklen < 0)
3461                                 masklen = 128;
3462                         mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
3463                         addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0];
3464                         /* convert masklen to netmask */
3465                         while (masklen > 0) {
3466                                 if (masklen < 32) {
3467                                         *mask6p =
3468                                             htonl(~(0xffffffff >> masklen));
3469                                         *addr6p &= *mask6p;
3470                                         break;
3471                                 } else {
3472                                         *mask6p++ = 0xffffffff;
3473                                         addr6p++;
3474                                         masklen -= 32;
3475                                 }
3476                         }
3477                         break;
3478 #endif
3479                 default:
3480                         goto err;
3481                 }
3482                 freeaddrinfo(res);
3483         } else {
3484                 /* arg `s' is domain name */
3485                 ap->isnumeric = 0;
3486                 ap->a_name = s;
3487                 if (cp1)
3488                         *cp1 = '/';
3489 #ifdef INET6
3490                 if (cp2) {
3491                         *cp2 = ']';
3492                         --s;
3493                 }
3494 #endif
3495         }
3496         STAILQ_INSERT_TAIL(&aphead, ap, next);
3497
3498         if (Debug) {
3499                 printf("allowaddr: rule ");
3500                 if (ap->isnumeric) {
3501                         printf("numeric, ");
3502                         getnameinfo(sstosa(&ap->a_addr),
3503                                     (sstosa(&ap->a_addr))->sa_len,
3504                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3505                         printf("addr = %s, ", ip);
3506                         getnameinfo(sstosa(&ap->a_mask),
3507                                     (sstosa(&ap->a_mask))->sa_len,
3508                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3509                         printf("mask = %s; ", ip);
3510                 } else {
3511                         printf("domainname = %s; ", ap->a_name);
3512                 }
3513                 printf("port = %d\n", ap->port);
3514         }
3515
3516         return (0);
3517 err:
3518         if (res != NULL)
3519                 freeaddrinfo(res);
3520         free(ap);
3521 #endif
3522         return (-1);
3523 }
3524
3525 /*
3526  * Validate that the remote peer has permission to log to us.
3527  */
3528 static int
3529 validate(struct sockaddr *sa, const char *hname)
3530 {
3531         int i;
3532         char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
3533         struct allowedpeer *ap;
3534 #ifdef INET
3535         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
3536 #endif
3537 #ifdef INET6
3538         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
3539 #endif
3540         struct addrinfo hints, *res;
3541         u_short sport;
3542         int num = 0;
3543
3544         STAILQ_FOREACH(ap, &aphead, next) {
3545                 num++;
3546         }
3547         dprintf("# of validation rule: %d\n", num);
3548         if (num == 0)
3549                 /* traditional behaviour, allow everything */
3550                 return (1);
3551
3552         (void)strlcpy(name, hname, sizeof(name));
3553         hints = (struct addrinfo){
3554                 .ai_family = PF_UNSPEC,
3555                 .ai_socktype = SOCK_DGRAM,
3556                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3557         };
3558         if (getaddrinfo(name, NULL, &hints, &res) == 0)
3559                 freeaddrinfo(res);
3560         else if (strchr(name, '.') == NULL) {
3561                 strlcat(name, ".", sizeof name);
3562                 strlcat(name, LocalDomain, sizeof name);
3563         }
3564         if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port),
3565                         NI_NUMERICHOST | NI_NUMERICSERV) != 0)
3566                 return (0);     /* for safety, should not occur */
3567         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
3568                 ip, port, name);
3569         sport = atoi(port);
3570
3571         /* now, walk down the list */
3572         i = 0;
3573         STAILQ_FOREACH(ap, &aphead, next) {
3574                 i++;
3575                 if (ap->port != 0 && ap->port != sport) {
3576                         dprintf("rejected in rule %d due to port mismatch.\n",
3577                             i);
3578                         continue;
3579                 }
3580
3581                 if (ap->isnumeric) {
3582                         if (ap->a_addr.ss_family != sa->sa_family) {
3583                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
3584                                 continue;
3585                         }
3586 #ifdef INET
3587                         else if (ap->a_addr.ss_family == AF_INET) {
3588                                 sin4 = satosin(sa);
3589                                 a4p = satosin(&ap->a_addr);
3590                                 m4p = satosin(&ap->a_mask);
3591                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
3592                                     != a4p->sin_addr.s_addr) {
3593                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3594                                         continue;
3595                                 }
3596                         }
3597 #endif
3598 #ifdef INET6
3599                         else if (ap->a_addr.ss_family == AF_INET6) {
3600                                 sin6 = satosin6(sa);
3601                                 a6p = satosin6(&ap->a_addr);
3602                                 m6p = satosin6(&ap->a_mask);
3603                                 if (a6p->sin6_scope_id != 0 &&
3604                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
3605                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
3606                                         continue;
3607                                 }
3608                                 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr,
3609                                     &a6p->sin6_addr, &m6p->sin6_addr)) {
3610                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3611                                         continue;
3612                                 }
3613                         }
3614 #endif
3615                         else
3616                                 continue;
3617                 } else {
3618                         if (fnmatch(ap->a_name, name, FNM_NOESCAPE) ==
3619                             FNM_NOMATCH) {
3620                                 dprintf("rejected in rule %d due to name "
3621                                     "mismatch.\n", i);
3622                                 continue;
3623                         }
3624                 }
3625                 dprintf("accepted in rule %d.\n", i);
3626                 return (1);     /* hooray! */
3627         }
3628         return (0);
3629 }
3630
3631 /*
3632  * Fairly similar to popen(3), but returns an open descriptor, as
3633  * opposed to a FILE *.
3634  */
3635 static int
3636 p_open(const char *prog, pid_t *rpid)
3637 {
3638         int pfd[2], nulldesc;
3639         pid_t pid;
3640         char *argv[4]; /* sh -c cmd NULL */
3641         char errmsg[200];
3642
3643         if (pipe(pfd) == -1)
3644                 return (-1);
3645         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
3646                 /* we are royally screwed anyway */
3647                 return (-1);
3648
3649         switch ((pid = fork())) {
3650         case -1:
3651                 close(nulldesc);
3652                 return (-1);
3653
3654         case 0:
3655                 (void)setsid(); /* Avoid catching SIGHUPs. */
3656                 argv[0] = strdup("sh");
3657                 argv[1] = strdup("-c");
3658                 argv[2] = strdup(prog);
3659                 argv[3] = NULL;
3660                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
3661                         logerror("strdup");
3662                         exit(1);
3663                 }
3664
3665                 alarm(0);
3666
3667                 /* Restore signals marked as SIG_IGN. */
3668                 (void)signal(SIGINT, SIG_DFL);
3669                 (void)signal(SIGQUIT, SIG_DFL);
3670                 (void)signal(SIGPIPE, SIG_DFL);
3671
3672                 dup2(pfd[0], STDIN_FILENO);
3673                 dup2(nulldesc, STDOUT_FILENO);
3674                 dup2(nulldesc, STDERR_FILENO);
3675                 closefrom(STDERR_FILENO + 1);
3676
3677                 (void)execvp(_PATH_BSHELL, argv);
3678                 _exit(255);
3679         }
3680         close(nulldesc);
3681         close(pfd[0]);
3682         /*
3683          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
3684          * supposed to get an EWOULDBLOCK on writev(2), which is
3685          * caught by the logic above anyway, which will in turn close
3686          * the pipe, and fork a new logging subprocess if necessary.
3687          * The stale subprocess will be killed some time later unless
3688          * it terminated itself due to closing its input pipe (so we
3689          * get rid of really dead puppies).
3690          */
3691         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
3692                 /* This is bad. */
3693                 (void)snprintf(errmsg, sizeof errmsg,
3694                                "Warning: cannot change pipe to PID %d to "
3695                                "non-blocking behaviour.",
3696                                (int)pid);
3697                 logerror(errmsg);
3698         }
3699         *rpid = pid;
3700         return (pfd[1]);
3701 }
3702
3703 static void
3704 deadq_enter(pid_t pid, const char *name)
3705 {
3706         struct deadq_entry *dq;
3707         int status;
3708
3709         if (pid == 0)
3710                 return;
3711         /*
3712          * Be paranoid, if we can't signal the process, don't enter it
3713          * into the dead queue (perhaps it's already dead).  If possible,
3714          * we try to fetch and log the child's status.
3715          */
3716         if (kill(pid, 0) != 0) {
3717                 if (waitpid(pid, &status, WNOHANG) > 0)
3718                         log_deadchild(pid, status, name);
3719                 return;
3720         }
3721
3722         dq = malloc(sizeof(*dq));
3723         if (dq == NULL) {
3724                 logerror("malloc");
3725                 exit(1);
3726         }
3727         *dq = (struct deadq_entry){
3728                 .dq_pid = pid,
3729                 .dq_timeout = DQ_TIMO_INIT
3730         };
3731         TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries);
3732 }
3733
3734 static int
3735 deadq_remove(struct deadq_entry *dq)
3736 {
3737         if (dq != NULL) {
3738                 TAILQ_REMOVE(&deadq_head, dq, dq_entries);
3739                 free(dq);
3740                 return (1);
3741         }
3742
3743         return (0);
3744 }
3745
3746 static int
3747 deadq_removebypid(pid_t pid)
3748 {
3749         struct deadq_entry *dq;
3750
3751         TAILQ_FOREACH(dq, &deadq_head, dq_entries) {
3752                 if (dq->dq_pid == pid)
3753                         break;
3754         }
3755         return (deadq_remove(dq));
3756 }
3757
3758 static void
3759 log_deadchild(pid_t pid, int status, const char *name)
3760 {
3761         int code;
3762         char buf[256];
3763         const char *reason;
3764
3765         errno = 0; /* Keep strerror() stuff out of logerror messages. */
3766         if (WIFSIGNALED(status)) {
3767                 reason = "due to signal";
3768                 code = WTERMSIG(status);
3769         } else {
3770                 reason = "with status";
3771                 code = WEXITSTATUS(status);
3772                 if (code == 0)
3773                         return;
3774         }
3775         (void)snprintf(buf, sizeof buf,
3776                        "Logging subprocess %d (%s) exited %s %d.",
3777                        pid, name, reason, code);
3778         logerror(buf);
3779 }
3780
3781 static int
3782 socksetup(struct peer *pe)
3783 {
3784         struct addrinfo hints, *res, *res0;
3785         int error;
3786         char *cp;
3787         int (*sl_recv)(struct socklist *);
3788         /*
3789          * We have to handle this case for backwards compatibility:
3790          * If there are two (or more) colons but no '[' and ']',
3791          * assume this is an inet6 address without a service.
3792          */
3793         if (pe->pe_name != NULL) {
3794 #ifdef INET6
3795                 if (pe->pe_name[0] == '[' &&
3796                     (cp = strchr(pe->pe_name + 1, ']')) != NULL) {
3797                         pe->pe_name = &pe->pe_name[1];
3798                         *cp = '\0';
3799                         if (cp[1] == ':' && cp[2] != '\0')
3800                                 pe->pe_serv = cp + 2;
3801                 } else {
3802 #endif
3803                         cp = strchr(pe->pe_name, ':');
3804                         if (cp != NULL && strchr(cp + 1, ':') == NULL) {
3805                                 *cp = '\0';
3806                                 if (cp[1] != '\0')
3807                                         pe->pe_serv = cp + 1;
3808                                 if (cp == pe->pe_name)
3809                                         pe->pe_name = NULL;
3810                         }
3811 #ifdef INET6
3812                 }
3813 #endif
3814         }
3815         hints = (struct addrinfo){
3816                 .ai_family = AF_UNSPEC,
3817                 .ai_socktype = SOCK_DGRAM,
3818                 .ai_flags = AI_PASSIVE
3819         };
3820         if (pe->pe_name != NULL)
3821                 dprintf("Trying peer: %s\n", pe->pe_name);
3822         if (pe->pe_serv == NULL)
3823                 pe->pe_serv = "syslog";
3824         error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0);
3825         if (error) {
3826                 char *msgbuf;
3827
3828                 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s",
3829                     pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv,
3830                     gai_strerror(error));
3831                 errno = 0;
3832                 if (msgbuf == NULL)
3833                         logerror(gai_strerror(error));
3834                 else
3835                         logerror(msgbuf);
3836                 free(msgbuf);
3837                 die(0);
3838         }
3839         for (res = res0; res != NULL; res = res->ai_next) {
3840                 int s;
3841
3842                 if (res->ai_family != AF_LOCAL &&
3843                     SecureMode > 1) {
3844                         /* Only AF_LOCAL in secure mode. */
3845                         continue;
3846                 }
3847                 if (family != AF_UNSPEC &&
3848                     res->ai_family != AF_LOCAL && res->ai_family != family)
3849                         continue;
3850
3851                 s = socket(res->ai_family, res->ai_socktype,
3852                     res->ai_protocol);
3853                 if (s < 0) {
3854                         logerror("socket");
3855                         error++;
3856                         continue;
3857                 }
3858 #ifdef INET6
3859                 if (res->ai_family == AF_INET6) {
3860                         if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
3861                                &(int){1}, sizeof(int)) < 0) {
3862                                 logerror("setsockopt(IPV6_V6ONLY)");
3863                                 close(s);
3864                                 error++;
3865                                 continue;
3866                         }
3867                 }
3868 #endif
3869                 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
3870                     &(int){1}, sizeof(int)) < 0) {
3871                         logerror("setsockopt(SO_REUSEADDR)");
3872                         close(s);
3873                         error++;
3874                         continue;
3875                 }
3876
3877                 /*
3878                  * Bind INET and UNIX-domain sockets.
3879                  *
3880                  * A UNIX-domain socket is always bound to a pathname
3881                  * regardless of -N flag.
3882                  *
3883                  * For INET sockets, RFC 3164 recommends that client
3884                  * side message should come from the privileged syslogd port.
3885                  *
3886                  * If the system administrator chooses not to obey
3887                  * this, we can skip the bind() step so that the
3888                  * system will choose a port for us.
3889                  */
3890                 if (res->ai_family == AF_LOCAL)
3891                         unlink(pe->pe_name);
3892                 if (res->ai_family == AF_LOCAL ||
3893                     NoBind == 0 || pe->pe_name != NULL) {
3894                         if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
3895                                 logerror("bind");
3896                                 close(s);
3897                                 error++;
3898                                 continue;
3899                         }
3900                         if (res->ai_family == AF_LOCAL ||
3901                             SecureMode == 0)
3902                                 increase_rcvbuf(s);
3903                 }
3904                 if (res->ai_family == AF_LOCAL &&
3905                     chmod(pe->pe_name, pe->pe_mode) < 0) {
3906                         dprintf("chmod %s: %s\n", pe->pe_name,
3907                             strerror(errno));
3908                         close(s);
3909                         error++;
3910                         continue;
3911                 }
3912                 dprintf("new socket fd is %d\n", s);
3913                 if (res->ai_socktype != SOCK_DGRAM) {
3914                         listen(s, 5);
3915                 }
3916                 sl_recv = socklist_recv_sock;
3917 #if defined(INET) || defined(INET6)
3918                 if (SecureMode && (res->ai_family == AF_INET ||
3919                     res->ai_family == AF_INET6)) {
3920                         dprintf("shutdown\n");
3921                         /* Forbid communication in secure mode. */
3922                         if (shutdown(s, SHUT_RD) < 0 &&
3923                             errno != ENOTCONN) {
3924                                 logerror("shutdown");
3925                                 if (!Debug)
3926                                         die(0);
3927                         }
3928                         sl_recv = NULL;
3929                 } else
3930 #endif
3931                         dprintf("listening on socket\n");
3932                 dprintf("sending on socket\n");
3933                 addsock(res, &(struct socklist){
3934                         .sl_socket = s,
3935                         .sl_peer = pe,
3936                         .sl_recv = sl_recv
3937                 });
3938         }
3939         freeaddrinfo(res0);
3940
3941         return(error);
3942 }
3943
3944 static void
3945 increase_rcvbuf(int fd)
3946 {
3947         socklen_t len;
3948
3949         if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len,
3950             &(socklen_t){sizeof(len)}) == 0) {
3951                 if (len < RCVBUF_MINSIZE) {
3952                         len = RCVBUF_MINSIZE;
3953                         setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
3954                 }
3955         }
3956 }