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 <stdio.h>
 141 #include <stdlib.h>
 142 #include <string.h>
 143 #include <sysexits.h>
 144 #include <unistd.h>
 145 #include <utmpx.h>
 146
 147 #include "pathnames.h"
 148 #include "ttymsg.h"
 149
 150 #define SYSLOG_NAMES
 151 #include <sys/syslog.h>
 152
 153 static const char *ConfFile = _PATH_LOGCONF;
 154 static const char *PidFile = _PATH_LOGPID;
 155 static const char ctty[] = _PATH_CONSOLE;
 156 static const char include_str[] = "include";
 157 static const char include_ext[] = ".conf";
 158
 159 #define dprintf         if (Debug) printf
 160
 161 #define MAXUNAMES       20      /* maximum number of user names */
 162
 163 #define sstosa(ss)      ((struct sockaddr *)(ss))
 164 #ifdef INET
 165 #define sstosin(ss)     ((struct sockaddr_in *)(void *)(ss))
 166 #define satosin(sa)     ((struct sockaddr_in *)(void *)(sa))
 167 #endif
 168 #ifdef INET6
 169 #define sstosin6(ss)    ((struct sockaddr_in6 *)(void *)(ss))
 170 #define satosin6(sa)    ((struct sockaddr_in6 *)(void *)(sa))
 171 #define s6_addr32       __u6_addr.__u6_addr32
 172 #define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m)      (       \
 173         (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
 174         (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
 175         (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
 176         (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 )
 177 #endif
 178 /*
 179  * List of peers and sockets for binding.
 180  */
 181 struct peer {
 182         const char      *pe_name;
 183         const char      *pe_serv;
 184         mode_t          pe_mode;
 185         STAILQ_ENTRY(peer)      next;
 186 };
 187 static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue);
 188
 189 struct socklist {
 190         struct addrinfo         sl_ai;
 191 #define sl_sa           sl_ai.ai_addr
 192 #define sl_salen        sl_ai.ai_addrlen
 193 #define sl_family       sl_ai.ai_family
 194         int                     sl_socket;
 195         struct peer             *sl_peer;
 196         int                     (*sl_recv)(struct socklist *);
 197         STAILQ_ENTRY(socklist)  next;
 198 };
 199 static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead);
 200
 201 /*
 202  * Flags to logmsg().
 203  */
 204
 205 #define IGN_CONS        0x001   /* don't print on console */
 206 #define SYNC_FILE       0x002   /* do fsync on file after printing */
 207 #define MARK            0x008   /* this message is a mark */
 208
 209 /* Timestamps of log entries. */
 210 struct logtime {
 211         struct tm       tm;
 212         suseconds_t     usec;
 213 };
 214
 215 /* Traditional syslog timestamp format. */
 216 #define RFC3164_DATELEN 15
 217 #define RFC3164_DATEFMT "%b %e %H:%M:%S"
 218
 219 /*
 220  * This structure represents the files that will have log
 221  * copies printed.
 222  * We require f_file to be valid if f_type is F_FILE, F_CONSOLE, F_TTY
 223  * or if f_type is F_PIPE and f_pid > 0.
 224  */
 225
 226 struct filed {
 227         STAILQ_ENTRY(filed)     next;   /* next in linked list */
 228         short   f_type;                 /* entry type, see below */
 229         short   f_file;                 /* file descriptor */
 230         time_t  f_time;                 /* time this was last written */
 231         char    *f_host;                /* host from which to recd. */
 232         u_char  f_pmask[LOG_NFACILITIES+1];     /* priority mask */
 233         u_char  f_pcmp[LOG_NFACILITIES+1];      /* compare priority */
 234 #define PRI_LT  0x1
 235 #define PRI_EQ  0x2
 236 #define PRI_GT  0x4
 237         char    *f_program;             /* program this applies to */
 238         union {
 239                 char    f_uname[MAXUNAMES][MAXLOGNAME];
 240                 struct {
 241                         char    f_hname[MAXHOSTNAMELEN];
 242                         struct addrinfo *f_addr;
 243
 244                 } f_forw;               /* forwarding address */
 245                 char    f_fname[MAXPATHLEN];
 246                 struct {
 247                         char    f_pname[MAXPATHLEN];
 248                         pid_t   f_pid;
 249                 } f_pipe;
 250         } f_un;
 251 #define fu_uname        f_un.f_uname
 252 #define fu_forw_hname   f_un.f_forw.f_hname
 253 #define fu_forw_addr    f_un.f_forw.f_addr
 254 #define fu_fname        f_un.f_fname
 255 #define fu_pipe_pname   f_un.f_pipe.f_pname
 256 #define fu_pipe_pid     f_un.f_pipe.f_pid
 257         char    f_prevline[MAXSVLINE];          /* last message logged */
 258         struct logtime f_lasttime;              /* time of last occurrence */
 259         int     f_prevpri;                      /* pri of f_prevline */
 260         size_t  f_prevlen;                      /* length of f_prevline */
 261         int     f_prevcount;                    /* repetition cnt of prevline */
 262         u_int   f_repeatcount;                  /* number of "repeated" msgs */
 263         int     f_flags;                        /* file-specific flags */
 264 #define FFLAG_SYNC 0x01
 265 #define FFLAG_NEEDSYNC  0x02
 266 };
 267
 268 /*
 269  * Queue of about-to-be dead processes we should watch out for.
 270  */
 271 struct deadq_entry {
 272         pid_t                           dq_pid;
 273         int                             dq_timeout;
 274         TAILQ_ENTRY(deadq_entry)        dq_entries;
 275 };
 276 static TAILQ_HEAD(, deadq_entry) deadq_head =
 277     TAILQ_HEAD_INITIALIZER(deadq_head);
 278
 279 /*
 280  * The timeout to apply to processes waiting on the dead queue.  Unit
 281  * of measure is `mark intervals', i.e. 20 minutes by default.
 282  * Processes on the dead queue will be terminated after that time.
 283  */
 284
 285 #define  DQ_TIMO_INIT   2
 286
 287 /*
 288  * Struct to hold records of network addresses that are allowed to log
 289  * to us.
 290  */
 291 struct allowedpeer {
 292         int isnumeric;
 293         u_short port;
 294         union {
 295                 struct {
 296                         struct sockaddr_storage addr;
 297                         struct sockaddr_storage mask;
 298                 } numeric;
 299                 char *name;
 300         } u;
 301 #define a_addr u.numeric.addr
 302 #define a_mask u.numeric.mask
 303 #define a_name u.name
 304         STAILQ_ENTRY(allowedpeer)       next;
 305 };
 306 static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead);
 307
 308
 309 /*
 310  * Intervals at which we flush out "message repeated" messages,
 311  * in seconds after previous message is logged.  After each flush,
 312  * we move to the next interval until we reach the largest.
 313  */
 314 static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
 315 #define MAXREPEAT       (nitems(repeatinterval) - 1)
 316 #define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
 317 #define BACKOFF(f)      do {                                            \
 318                                 if (++(f)->f_repeatcount > MAXREPEAT)   \
 319                                         (f)->f_repeatcount = MAXREPEAT; \
 320                         } while (0)
 321
 322 /* values for f_type */
 323 #define F_UNUSED        0               /* unused entry */
 324 #define F_FILE          1               /* regular file */
 325 #define F_TTY           2               /* terminal */
 326 #define F_CONSOLE       3               /* console terminal */
 327 #define F_FORW          4               /* remote machine */
 328 #define F_USERS         5               /* list of users */
 329 #define F_WALL          6               /* everyone logged on */
 330 #define F_PIPE          7               /* pipe to program */
 331
 332 static const char *TypeNames[] = {
 333         "UNUSED",       "FILE",         "TTY",          "CONSOLE",
 334         "FORW",         "USERS",        "WALL",         "PIPE"
 335 };
 336
 337 static STAILQ_HEAD(, filed) fhead =
 338     STAILQ_HEAD_INITIALIZER(fhead);     /* Log files that we write to */
 339 static struct filed consfile;   /* Console */
 340
 341 static int      Debug;          /* debug flag */
 342 static int      Foreground = 0; /* Run in foreground, instead of daemonizing */
 343 static int      resolve = 1;    /* resolve hostname */
 344 static char     LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
 345 static const char *LocalDomain; /* our local domain name */
 346 static int      Initialized;    /* set when we have initialized ourselves */
 347 static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
 348 static int      MarkSeq;        /* mark sequence number */
 349 static int      NoBind;         /* don't bind() as suggested by RFC 3164 */
 350 static int      SecureMode;     /* when true, receive only unix domain socks */
 351 #ifdef INET6
 352 static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
 353 #else
 354 static int      family = PF_INET; /* protocol family (IPv4 only) */
 355 #endif
 356 static int      mask_C1 = 1;    /* mask characters from 0x80 - 0x9F */
 357 static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
 358 static int      use_bootfile;   /* log entire bootfile for every kern msg */
 359 static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
 360 static int      logflags = O_WRONLY|O_APPEND; /* flags used to open log files */
 361
 362 static char     bootfile[MAXLINE+1]; /* booted kernel file */
 363
 364 static int      RemoteAddDate;  /* Always set the date on remote messages */
 365 static int      RemoteHostname; /* Log remote hostname from the message */
 366
 367 static int      UniquePriority; /* Only log specified priority? */
 368 static int      LogFacPri;      /* Put facility and priority in log message: */
 369                                 /* 0=no, 1=numeric, 2=names */
 370 static int      KeepKernFac;    /* Keep remotely logged kernel facility */
 371 static int      needdofsync = 0; /* Are any file(s) waiting to be fsynced? */
 372 static struct pidfh *pfh;
 373 static int      sigpipe[2];     /* Pipe to catch a signal during select(). */
 374 static bool     RFC3164OutputFormat = true; /* Use legacy format by default. */
 375
 376 static volatile sig_atomic_t MarkSet, WantDie, WantInitialize, WantReapchild;
 377
 378 struct iovlist;
 379
 380 static int      allowaddr(char *);
 381 static int      addfile(struct filed *);
 382 static int      addpeer(struct peer *);
 383 static int      addsock(struct addrinfo *, struct socklist *);
 384 static struct filed *cfline(const char *, const char *, const char *);
 385 static const char *cvthname(struct sockaddr *);
 386 static void     deadq_enter(pid_t, const char *);
 387 static int      deadq_remove(struct deadq_entry *);
 388 static int      deadq_removebypid(pid_t);
 389 static int      decode(const char *, const CODE *);
 390 static void     die(int) __dead2;
 391 static void     dodie(int);
 392 static void     dofsync(void);
 393 static void     domark(int);
 394 static void     fprintlog_first(struct filed *, const char *, const char *,
 395     const char *, const char *, const char *, const char *, int);
 396 static void     fprintlog_write(struct filed *, struct iovlist *, int);
 397 static void     fprintlog_successive(struct filed *, int);
 398 static void     init(int);
 399 static void     logerror(const char *);
 400 static void     logmsg(int, const struct logtime *, const char *, const char *,
 401     const char *, const char *, const char *, const char *, int);
 402 static void     log_deadchild(pid_t, int, const char *);
 403 static void     markit(void);
 404 static int      socksetup(struct peer *);
 405 static int      socklist_recv_file(struct socklist *);
 406 static int      socklist_recv_sock(struct socklist *);
 407 static int      socklist_recv_signal(struct socklist *);
 408 static void     sighandler(int);
 409 static int      skip_message(const char *, const char *, int);
 410 static void     parsemsg(const char *, char *);
 411 static void     printsys(char *);
 412 static int      p_open(const char *, pid_t *);
 413 static void     reapchild(int);
 414 static const char *ttymsg_check(struct iovec *, int, char *, int);
 415 static void     usage(void);
 416 static int      validate(struct sockaddr *, const char *);
 417 static void     unmapped(struct sockaddr *);
 418 static void     wallmsg(struct filed *, struct iovec *, const int iovlen);
 419 static int      waitdaemon(int);
 420 static void     timedout(int);
 421 static void     increase_rcvbuf(int);
 422
 423 static void
 424 close_filed(struct filed *f)
 425 {
 426
 427         if (f == NULL || f->f_file == -1)
 428                 return;
 429
 430         switch (f->f_type) {
 431         case F_FORW:
 432                 if (f->fu_forw_addr != NULL) {
 433                         freeaddrinfo(f->fu_forw_addr);
 434                         f->fu_forw_addr = NULL;
 435                 }
 436                 /* FALLTHROUGH */
 437
 438         case F_FILE:
 439         case F_TTY:
 440         case F_CONSOLE:
 441                 f->f_type = F_UNUSED;
 442                 break;
 443         case F_PIPE:
 444                 f->fu_pipe_pid = 0;
 445                 break;
 446         }
 447         (void)close(f->f_file);
 448         f->f_file = -1;
 449 }
 450
 451 static int
 452 addfile(struct filed *f0)
 453 {
 454         struct filed *f;
 455
 456         f = calloc(1, sizeof(*f));
 457         if (f == NULL)
 458                 err(1, "malloc failed");
 459         *f = *f0;
 460         STAILQ_INSERT_TAIL(&fhead, f, next);
 461
 462         return (0);
 463 }
 464
 465 static int
 466 addpeer(struct peer *pe0)
 467 {
 468         struct peer *pe;
 469
 470         pe = calloc(1, sizeof(*pe));
 471         if (pe == NULL)
 472                 err(1, "malloc failed");
 473         *pe = *pe0;
 474         STAILQ_INSERT_TAIL(&pqueue, pe, next);
 475
 476         return (0);
 477 }
 478
 479 static int
 480 addsock(struct addrinfo *ai, struct socklist *sl0)
 481 {
 482         struct socklist *sl;
 483
 484         /* Copy *ai->ai_addr to the tail of struct socklist if any. */
 485         sl = calloc(1, sizeof(*sl) + ((ai != NULL) ? ai->ai_addrlen : 0));
 486         if (sl == NULL)
 487                 err(1, "malloc failed");
 488         *sl = *sl0;
 489         if (ai != NULL) {
 490                 memcpy(&sl->sl_ai, ai, sizeof(*ai));
 491                 if (ai->ai_addrlen > 0) {
 492                         memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen);
 493                         sl->sl_sa = (struct sockaddr *)(sl + 1);
 494                 } else
 495                         sl->sl_sa = NULL;
 496         }
 497         STAILQ_INSERT_TAIL(&shead, sl, next);
 498
 499         return (0);
 500 }
 501
 502 int
 503 main(int argc, char *argv[])
 504 {
 505         int ch, i, s, fdsrmax = 0, bflag = 0, pflag = 0, Sflag = 0;
 506         fd_set *fdsr = NULL;
 507         struct timeval tv, *tvp;
 508         struct peer *pe;
 509         struct socklist *sl;
 510         pid_t ppid = 1, spid;
 511         char *p;
 512
 513         if (madvise(NULL, 0, MADV_PROTECT) != 0)
 514                 dprintf("madvise() failed: %s\n", strerror(errno));
 515
 516         while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:m:nNoO:p:P:sS:Tuv"))
 517             != -1)
 518                 switch (ch) {
 519 #ifdef INET
 520                 case '4':
 521                         family = PF_INET;
 522                         break;
 523 #endif
 524 #ifdef INET6
 525                 case '6':
 526                         family = PF_INET6;
 527                         break;
 528 #endif
 529                 case '8':
 530                         mask_C1 = 0;
 531                         break;
 532                 case 'A':
 533                         send_to_all++;
 534                         break;
 535                 case 'a':               /* allow specific network addresses only */
 536                         if (allowaddr(optarg) == -1)
 537                                 usage();
 538                         break;
 539                 case 'b':
 540                         bflag = 1;
 541                         p = strchr(optarg, ']');
 542                         if (p != NULL)
 543                                 p = strchr(p + 1, ':');
 544                         else {
 545                                 p = strchr(optarg, ':');
 546                                 if (p != NULL && strchr(p + 1, ':') != NULL)
 547                                         p = NULL; /* backward compatibility */
 548                         }
 549                         if (p == NULL) {
 550                                 /* A hostname or filename only. */
 551                                 addpeer(&(struct peer){
 552                                         .pe_name = optarg,
 553                                         .pe_serv = "syslog"
 554                                 });
 555                         } else {
 556                                 /* The case of "name:service". */
 557                                 *p++ = '\0';
 558                                 addpeer(&(struct peer){
 559                                         .pe_serv = p,
 560                                         .pe_name = (strlen(optarg) == 0) ?
 561                                             NULL : optarg,
 562                                 });
 563                         }
 564                         break;
 565                 case 'c':
 566                         no_compress++;
 567                         break;
 568                 case 'C':
 569                         logflags |= O_CREAT;
 570                         break;
 571                 case 'd':               /* debug */
 572                         Debug++;
 573                         break;
 574                 case 'f':               /* configuration file */
 575                         ConfFile = optarg;
 576                         break;
 577                 case 'F':               /* run in foreground instead of daemon */
 578                         Foreground++;
 579                         break;
 580                 case 'H':
 581                         RemoteHostname = 1;
 582                         break;
 583                 case 'k':               /* keep remote kern fac */
 584                         KeepKernFac = 1;
 585                         break;
 586                 case 'l':
 587                 case 'p':
 588                 case 'S':
 589                     {
 590                         long    perml;
 591                         mode_t  mode;
 592                         char    *name, *ep;
 593
 594                         if (ch == 'l')
 595                                 mode = DEFFILEMODE;
 596                         else if (ch == 'p') {
 597                                 mode = DEFFILEMODE;
 598                                 pflag = 1;
 599                         } else {
 600                                 mode = S_IRUSR | S_IWUSR;
 601                                 Sflag = 1;
 602                         }
 603                         if (optarg[0] == '/')
 604                                 name = optarg;
 605                         else if ((name = strchr(optarg, ':')) != NULL) {
 606                                 *name++ = '\0';
 607                                 if (name[0] != '/')
 608                                         errx(1, "socket name must be absolute "
 609                                             "path");
 610                                 if (isdigit(*optarg)) {
 611                                         perml = strtol(optarg, &ep, 8);
 612                                     if (*ep || perml < 0 ||
 613                                         perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
 614                                             errx(1, "invalid mode %s, exiting",
 615                                                 optarg);
 616                                     mode = (mode_t )perml;
 617                                 } else
 618                                         errx(1, "invalid mode %s, exiting",
 619                                             optarg);
 620                         } else
 621                                 errx(1, "invalid filename %s, exiting",
 622                                     optarg);
 623                         addpeer(&(struct peer){
 624                                 .pe_name = name,
 625                                 .pe_mode = mode
 626                         });
 627                         break;
 628                    }
 629                 case 'm':               /* mark interval */
 630                         MarkInterval = atoi(optarg) * 60;
 631                         break;
 632                 case 'N':
 633                         NoBind = 1;
 634                         SecureMode = 1;
 635                         break;
 636                 case 'n':
 637                         resolve = 0;
 638                         break;
 639                 case 'O':
 640                         if (strcmp(optarg, "bsd") == 0 ||
 641                             strcmp(optarg, "rfc3164") == 0)
 642                                 RFC3164OutputFormat = true;
 643                         else if (strcmp(optarg, "syslog") == 0 ||
 644                             strcmp(optarg, "rfc5424") == 0)
 645                                 RFC3164OutputFormat = false;
 646                         else
 647                                 usage();
 648                         break;
 649                 case 'o':
 650                         use_bootfile = 1;
 651                         break;
 652                 case 'P':               /* path for alt. PID */
 653                         PidFile = optarg;
 654                         break;
 655                 case 's':               /* no network mode */
 656                         SecureMode++;
 657                         break;
 658                 case 'T':
 659                         RemoteAddDate = 1;
 660                         break;
 661                 case 'u':               /* only log specified priority */
 662                         UniquePriority++;
 663                         break;
 664                 case 'v':               /* log facility and priority */
 665                         LogFacPri++;
 666                         break;
 667                 default:
 668                         usage();
 669                 }
 670         if ((argc -= optind) != 0)
 671                 usage();
 672
 673         /* Pipe to catch a signal during select(). */
 674         s = pipe2(sigpipe, O_CLOEXEC);
 675         if (s < 0) {
 676                 err(1, "cannot open a pipe for signals");
 677         } else {
 678                 addsock(NULL, &(struct socklist){
 679                     .sl_socket = sigpipe[0],
 680                     .sl_recv = socklist_recv_signal
 681                 });
 682         }
 683
 684         /* Listen by default: /dev/klog. */
 685         s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0);
 686         if (s < 0) {
 687                 dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
 688         } else {
 689                 addsock(NULL, &(struct socklist){
 690                         .sl_socket = s,
 691                         .sl_recv = socklist_recv_file,
 692                 });
 693         }
 694         /* Listen by default: *:514 if no -b flag. */
 695         if (bflag == 0)
 696                 addpeer(&(struct peer){
 697                         .pe_serv = "syslog"
 698                 });
 699         /* Listen by default: /var/run/log if no -p flag. */
 700         if (pflag == 0)
 701                 addpeer(&(struct peer){
 702                         .pe_name = _PATH_LOG,
 703                         .pe_mode = DEFFILEMODE,
 704                 });
 705         /* Listen by default: /var/run/logpriv if no -S flag. */
 706         if (Sflag == 0)
 707                 addpeer(&(struct peer){
 708                         .pe_name = _PATH_LOG_PRIV,
 709                         .pe_mode = S_IRUSR | S_IWUSR,
 710                 });
 711         STAILQ_FOREACH(pe, &pqueue, next)
 712                 socksetup(pe);
 713
 714         pfh = pidfile_open(PidFile, 0600, &spid);
 715         if (pfh == NULL) {
 716                 if (errno == EEXIST)
 717                         errx(1, "syslogd already running, pid: %d", spid);
 718                 warn("cannot open pid file");
 719         }
 720
 721         if ((!Foreground) && (!Debug)) {
 722                 ppid = waitdaemon(30);
 723                 if (ppid < 0) {
 724                         warn("could not become daemon");
 725                         pidfile_remove(pfh);
 726                         exit(1);
 727                 }
 728         } else if (Debug)
 729                 setlinebuf(stdout);
 730
 731         consfile.f_type = F_CONSOLE;
 732         (void)strlcpy(consfile.fu_fname, ctty + sizeof _PATH_DEV - 1,
 733             sizeof(consfile.fu_fname));
 734         (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));
 735         (void)signal(SIGTERM, dodie);
 736         (void)signal(SIGINT, Debug ? dodie : SIG_IGN);
 737         (void)signal(SIGQUIT, Debug ? dodie : SIG_IGN);
 738         (void)signal(SIGHUP, sighandler);
 739         (void)signal(SIGCHLD, sighandler);
 740         (void)signal(SIGALRM, domark);
 741         (void)signal(SIGPIPE, SIG_IGN); /* We'll catch EPIPE instead. */
 742         (void)alarm(TIMERINTVL);
 743
 744         /* tuck my process id away */
 745         pidfile_write(pfh);
 746
 747         dprintf("off & running....\n");
 748
 749         tvp = &tv;
 750         tv.tv_sec = tv.tv_usec = 0;
 751
 752         STAILQ_FOREACH(sl, &shead, next) {
 753                 if (sl->sl_socket > fdsrmax)
 754                         fdsrmax = sl->sl_socket;
 755         }
 756         fdsr = (fd_set *)calloc(howmany(fdsrmax+1, NFDBITS),
 757             sizeof(*fdsr));
 758         if (fdsr == NULL)
 759                 errx(1, "calloc fd_set");
 760
 761         for (;;) {
 762                 if (Initialized == 0)
 763                         init(0);
 764                 else if (WantInitialize)
 765                         init(WantInitialize);
 766                 if (WantReapchild)
 767                         reapchild(WantReapchild);
 768                 if (MarkSet)
 769                         markit();
 770                 if (WantDie) {
 771                         free(fdsr);
 772                         die(WantDie);
 773                 }
 774
 775                 bzero(fdsr, howmany(fdsrmax+1, NFDBITS) *
 776                     sizeof(*fdsr));
 777
 778                 STAILQ_FOREACH(sl, &shead, next) {
 779                         if (sl->sl_socket != -1 && sl->sl_recv != NULL)
 780                                 FD_SET(sl->sl_socket, fdsr);
 781                 }
 782                 i = select(fdsrmax + 1, fdsr, NULL, NULL,
 783                     needdofsync ? &tv : tvp);
 784                 switch (i) {
 785                 case 0:
 786                         dofsync();
 787                         needdofsync = 0;
 788                         if (tvp) {
 789                                 tvp = NULL;
 790                                 if (ppid != 1)
 791                                         kill(ppid, SIGALRM);
 792                         }
 793                         continue;
 794                 case -1:
 795                         if (errno != EINTR)
 796                                 logerror("select");
 797                         continue;
 798                 }
 799                 STAILQ_FOREACH(sl, &shead, next) {
 800                         if (FD_ISSET(sl->sl_socket, fdsr))
 801                                 (*sl->sl_recv)(sl);
 802                 }
 803         }
 804         free(fdsr);
 805 }
 806
 807 static int
 808 socklist_recv_signal(struct socklist *sl __unused)
 809 {
 810         ssize_t len;
 811         int i, nsig, signo;
 812
 813         if (ioctl(sigpipe[0], FIONREAD, &i) != 0) {
 814                 logerror("ioctl(FIONREAD)");
 815                 err(1, "signal pipe read failed");
 816         }
 817         nsig = i / sizeof(signo);
 818         dprintf("# of received signals = %d\n", nsig);
 819         for (i = 0; i < nsig; i++) {
 820                 len = read(sigpipe[0], &signo, sizeof(signo));
 821                 if (len != sizeof(signo)) {
 822                         logerror("signal pipe read failed");
 823                         err(1, "signal pipe read failed");
 824                 }
 825                 dprintf("Received signal: %d from fd=%d\n", signo,
 826                     sigpipe[0]);
 827                 switch (signo) {
 828                 case SIGHUP:
 829                         WantInitialize = 1;
 830                         break;
 831                 case SIGCHLD:
 832                         WantReapchild = 1;
 833                         break;
 834                 }
 835         }
 836         return (0);
 837 }
 838
 839 static int
 840 socklist_recv_sock(struct socklist *sl)
 841 {
 842         struct sockaddr_storage ss;
 843         struct sockaddr *sa = (struct sockaddr *)&ss;
 844         socklen_t sslen;
 845         const char *hname;
 846         char line[MAXLINE + 1];
 847         int len;
 848
 849         sslen = sizeof(ss);
 850         len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen);
 851         dprintf("received sa_len = %d\n", sslen);
 852         if (len == 0)
 853                 return (-1);
 854         if (len < 0) {
 855                 if (errno != EINTR)
 856                         logerror("recvfrom");
 857                 return (-1);
 858         }
 859         /* Received valid data. */
 860         line[len] = '\0';
 861         if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL)
 862                 hname = LocalHostName;
 863         else {
 864                 hname = cvthname(sa);
 865                 unmapped(sa);
 866                 if (validate(sa, hname) == 0) {
 867                         dprintf("Message from %s was ignored.", hname);
 868                         return (-1);
 869                 }
 870         }
 871         parsemsg(hname, line);
 872
 873         return (0);
 874 }
 875
 876 static void
 877 unmapped(struct sockaddr *sa)
 878 {
 879 #if defined(INET) && defined(INET6)
 880         struct sockaddr_in6 *sin6;
 881         struct sockaddr_in sin;
 882
 883         if (sa == NULL ||
 884             sa->sa_family != AF_INET6 ||
 885             sa->sa_len != sizeof(*sin6))
 886                 return;
 887         sin6 = satosin6(sa);
 888         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 889                 return;
 890         sin = (struct sockaddr_in){
 891                 .sin_family = AF_INET,
 892                 .sin_len = sizeof(sin),
 893                 .sin_port = sin6->sin6_port
 894         };
 895         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
 896             sizeof(sin.sin_addr));
 897         memcpy(sa, &sin, sizeof(sin));
 898 #else
 899         if (sa == NULL)
 900                 return;
 901 #endif
 902 }
 903
 904 static void
 905 usage(void)
 906 {
 907
 908         fprintf(stderr,
 909                 "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n"
 910                 "               [-b bind_address] [-f config_file]\n"
 911                 "               [-l [mode:]path] [-m mark_interval]\n"
 912                 "               [-O format] [-P pid_file] [-p log_socket]\n"
 913                 "               [-S logpriv_socket]\n");
 914         exit(1);
 915 }
 916
 917 /*
 918  * Removes characters from log messages that are unsafe to display.
 919  * TODO: Permit UTF-8 strings that include a BOM per RFC 5424?
 920  */
 921 static void
 922 parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen)
 923 {
 924         char *q;
 925         int c;
 926
 927         q = out;
 928         while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) {
 929                 if (mask_C1 && (c & 0x80) && c < 0xA0) {
 930                         c &= 0x7F;
 931                         *q++ = 'M';
 932                         *q++ = '-';
 933                 }
 934                 if (isascii(c) && iscntrl(c)) {
 935                         if (c == '\n') {
 936                                 *q++ = ' ';
 937                         } else if (c == '\t') {
 938                                 *q++ = '\t';
 939                         } else {
 940                                 *q++ = '^';
 941                                 *q++ = c ^ 0100;
 942                         }
 943                 } else {
 944                         *q++ = c;
 945                 }
 946         }
 947         *q = '\0';
 948 }
 949
 950 /*
 951  * Parses a syslog message according to RFC 5424, assuming that PRI and
 952  * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The
 953  * parsed result is passed to logmsg().
 954  */
 955 static void
 956 parsemsg_rfc5424(const char *from, int pri, char *msg)
 957 {
 958         const struct logtime *timestamp;
 959         struct logtime timestamp_remote;
 960         const char *omsg, *hostname, *app_name, *procid, *msgid,
 961             *structured_data;
 962         char line[MAXLINE + 1];
 963
 964 #define FAIL_IF(field, expr) do {                                       \
 965         if (expr) {                                                     \
 966                 dprintf("Failed to parse " field " from %s: %s\n",      \
 967                     from, omsg);                                        \
 968                 return;                                                 \
 969         }                                                               \
 970 } while (0)
 971 #define PARSE_CHAR(field, sep) do {                                     \
 972         FAIL_IF(field, *msg != sep);                                    \
 973         ++msg;                                                          \
 974 } while (0)
 975 #define IF_NOT_NILVALUE(var)                                            \
 976         if (msg[0] == '-' && msg[1] == ' ') {                           \
 977                 msg += 2;                                               \
 978                 var = NULL;                                             \
 979         } else if (msg[0] == '-' && msg[1] == '\0') {                   \
 980                 ++msg;                                                  \
 981                 var = NULL;                                             \
 982         } else
 983
 984         omsg = msg;
 985         IF_NOT_NILVALUE(timestamp) {
 986                 /* Parse RFC 3339-like timestamp. */
 987 #define PARSE_NUMBER(dest, length, min, max) do {                       \
 988         int i, v;                                                       \
 989                                                                         \
 990         v = 0;                                                          \
 991         for (i = 0; i < length; ++i) {                                  \
 992                 FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9');         \
 993                 v = v * 10 + *msg++ - '0';                              \
 994         }                                                               \
 995         FAIL_IF("TIMESTAMP", v < min || v > max);                       \
 996         dest = v;                                                       \
 997 } while (0)
 998                 /* Date and time. */
 999                 memset(&timestamp_remote, 0, sizeof(timestamp_remote));
1000                 PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999);
1001                 timestamp_remote.tm.tm_year -= 1900;
1002                 PARSE_CHAR("TIMESTAMP", '-');
1003                 PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12);
1004                 --timestamp_remote.tm.tm_mon;
1005                 PARSE_CHAR("TIMESTAMP", '-');
1006                 PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31);
1007                 PARSE_CHAR("TIMESTAMP", 'T');
1008                 PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23);
1009                 PARSE_CHAR("TIMESTAMP", ':');
1010                 PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59);
1011                 PARSE_CHAR("TIMESTAMP", ':');
1012                 PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59);
1013                 /* Perform normalization. */
1014                 timegm(&timestamp_remote.tm);
1015                 /* Optional: fractional seconds. */
1016                 if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') {
1017                         int i;
1018
1019                         ++msg;
1020                         for (i = 100000; i != 0; i /= 10) {
1021                                 if (*msg < '0' || *msg > '9')
1022                                         break;
1023                                 timestamp_remote.usec += (*msg++ - '0') * i;
1024                         }
1025                 }
1026                 /* Timezone. */
1027                 if (*msg == 'Z') {
1028                         /* UTC. */
1029                         ++msg;
1030                 } else {
1031                         int sign, tz_hour, tz_min;
1032
1033                         /* Local time zone offset. */
1034                         FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+');
1035                         sign = *msg++ == '-' ? -1 : 1;
1036                         PARSE_NUMBER(tz_hour, 2, 0, 23);
1037                         PARSE_CHAR("TIMESTAMP", ':');
1038                         PARSE_NUMBER(tz_min, 2, 0, 59);
1039                         timestamp_remote.tm.tm_gmtoff =
1040                             sign * (tz_hour * 3600 + tz_min * 60);
1041                 }
1042 #undef PARSE_NUMBER
1043                 PARSE_CHAR("TIMESTAMP", ' ');
1044                 timestamp = RemoteAddDate ? NULL : &timestamp_remote;
1045         }
1046
1047         /* String fields part of the HEADER. */
1048 #define PARSE_STRING(field, var)                                        \
1049         IF_NOT_NILVALUE(var) {                                          \
1050                 var = msg;                                              \
1051                 while (*msg >= '!' && *msg <= '~')                      \
1052                         ++msg;                                          \
1053                 FAIL_IF(field, var == msg);                             \
1054                 PARSE_CHAR(field, ' ');                                 \
1055                 msg[-1] = '\0';                                         \
1056         }
1057         PARSE_STRING("HOSTNAME", hostname);
1058         if (hostname == NULL || !RemoteHostname)
1059                 hostname = from;
1060         PARSE_STRING("APP-NAME", app_name);
1061         PARSE_STRING("PROCID", procid);
1062         PARSE_STRING("MSGID", msgid);
1063 #undef PARSE_STRING
1064
1065         /* Structured data. */
1066 #define PARSE_SD_NAME() do {                                            \
1067         const char *start;                                              \
1068                                                                         \
1069         start = msg;                                                    \
1070         while (*msg >= '!' && *msg <= '~' && *msg != '=' &&             \
1071             *msg != ']' && *msg != '"')                                 \
1072                 ++msg;                                                  \
1073         FAIL_IF("STRUCTURED-NAME", start == msg);                       \
1074 } while (0)
1075         IF_NOT_NILVALUE(structured_data) {
1076                 /* SD-ELEMENT. */
1077                 while (*msg == '[') {
1078                         ++msg;
1079                         /* SD-ID. */
1080                         PARSE_SD_NAME();
1081                         /* SD-PARAM. */
1082                         while (*msg == ' ') {
1083                                 ++msg;
1084                                 /* PARAM-NAME. */
1085                                 PARSE_SD_NAME();
1086                                 PARSE_CHAR("STRUCTURED-NAME", '=');
1087                                 PARSE_CHAR("STRUCTURED-NAME", '"');
1088                                 while (*msg != '"') {
1089                                         FAIL_IF("STRUCTURED-NAME",
1090                                             *msg == '\0');
1091                                         if (*msg++ == '\\') {
1092                                                 FAIL_IF("STRUCTURED-NAME",
1093                                                     *msg == '\0');
1094                                                 ++msg;
1095                                         }
1096                                 }
1097                                 ++msg;
1098                         }
1099                         PARSE_CHAR("STRUCTURED-NAME", ']');
1100                 }
1101                 PARSE_CHAR("STRUCTURED-NAME", ' ');
1102                 msg[-1] = '\0';
1103         }
1104 #undef PARSE_SD_NAME
1105
1106 #undef FAIL_IF
1107 #undef PARSE_CHAR
1108 #undef IF_NOT_NILVALUE
1109
1110         parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
1111         logmsg(pri, timestamp, hostname, app_name, procid, msgid,
1112             structured_data, line, 0);
1113 }
1114
1115 /*
1116  * Trims the application name ("TAG" in RFC 3164 terminology) and
1117  * process ID from a message if present.
1118  */
1119 static void
1120 parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name,
1121     const char **procid) {
1122         char *m, *app_name_begin, *procid_begin;
1123         size_t app_name_length, procid_length;
1124
1125         m = *msg;
1126
1127         /* Application name. */
1128         app_name_begin = m;
1129         app_name_length = strspn(m,
1130             "abcdefghijklmnopqrstuvwxyz"
1131             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1132             "0123456789"
1133             "_-/");
1134         if (app_name_length == 0)
1135                 goto bad;
1136         m += app_name_length;
1137
1138         /* Process identifier (optional). */
1139         if (*m == '[') {
1140                 procid_begin = ++m;
1141                 procid_length = strspn(m, "0123456789");
1142                 if (procid_length == 0)
1143                         goto bad;
1144                 m += procid_length;
1145                 if (*m++ != ']')
1146                         goto bad;
1147         } else {
1148                 procid_begin = NULL;
1149                 procid_length = 0;
1150         }
1151
1152         /* Separator. */
1153         if (m[0] != ':' || m[1] != ' ')
1154                 goto bad;
1155
1156         /* Split strings from input. */
1157         app_name_begin[app_name_length] = '\0';
1158         if (procid_begin != 0)
1159                 procid_begin[procid_length] = '\0';
1160
1161         *msg = m + 2;
1162         *app_name = app_name_begin;
1163         *procid = procid_begin;
1164         return;
1165 bad:
1166         *app_name = NULL;
1167         *procid = NULL;
1168 }
1169
1170 /*
1171  * Parses a syslog message according to RFC 3164, assuming that PRI
1172  * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed
1173  * result is passed to logmsg().
1174  */
1175 static void
1176 parsemsg_rfc3164(const char *from, int pri, char *msg)
1177 {
1178         struct tm tm_parsed;
1179         const struct logtime *timestamp;
1180         struct logtime timestamp_remote;
1181         const char *app_name, *procid;
1182         size_t i, msglen;
1183         char line[MAXLINE + 1];
1184
1185         /*
1186          * Parse the TIMESTAMP provided by the remote side. If none is
1187          * found, assume this is not an RFC 3164 formatted message,
1188          * only containing a TAG and a MSG.
1189          */
1190         timestamp = NULL;
1191         if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) ==
1192             msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') {
1193                 msg += RFC3164_DATELEN + 1;
1194                 if (!RemoteAddDate) {
1195                         struct tm tm_now;
1196                         time_t t_now;
1197                         int year;
1198
1199                         /*
1200                          * As the timestamp does not contain the year
1201                          * number, daylight saving time information, nor
1202                          * a time zone, attempt to infer it. Due to
1203                          * clock skews, the timestamp may even be part
1204                          * of the next year. Use the last year for which
1205                          * the timestamp is at most one week in the
1206                          * future.
1207                          *
1208                          * This loop can only run for at most three
1209                          * iterations before terminating.
1210                          */
1211                         t_now = time(NULL);
1212                         localtime_r(&t_now, &tm_now);
1213                         for (year = tm_now.tm_year + 1;; --year) {
1214                                 assert(year >= tm_now.tm_year - 1);
1215                                 timestamp_remote.tm = tm_parsed;
1216                                 timestamp_remote.tm.tm_year = year;
1217                                 timestamp_remote.tm.tm_isdst = -1;
1218                                 timestamp_remote.usec = 0;
1219                                 if (mktime(&timestamp_remote.tm) <
1220                                     t_now + 7 * 24 * 60 * 60)
1221                                         break;
1222                         }
1223                         timestamp = &timestamp_remote;
1224                 }
1225
1226                 /*
1227                  * A single space character MUST also follow the HOSTNAME field.
1228                  */
1229                 msglen = strlen(msg);
1230                 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) {
1231                         if (msg[i] == ' ') {
1232                                 if (RemoteHostname) {
1233                                         msg[i] = '\0';
1234                                         from = msg;
1235                                 }
1236                                 msg += i + 1;
1237                                 break;
1238                         }
1239                         /*
1240                          * Support non RFC compliant messages, without hostname.
1241                          */
1242                         if (msg[i] == ':')
1243                                 break;
1244                 }
1245                 if (i == MIN(MAXHOSTNAMELEN, msglen)) {
1246                         dprintf("Invalid HOSTNAME from %s: %s\n", from, msg);
1247                         return;
1248                 }
1249         }
1250
1251         /* Remove the TAG, if present. */
1252         parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid);
1253         parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
1254         logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0);
1255 }
1256
1257 /*
1258  * Takes a raw input line, extracts PRI and determines whether the
1259  * message is formatted according to RFC 3164 or RFC 5424. Continues
1260  * parsing of addition fields in the message according to those
1261  * standards and prints the message on the appropriate log files.
1262  */
1263 static void
1264 parsemsg(const char *from, char *msg)
1265 {
1266         char *q;
1267         long n;
1268         size_t i;
1269         int pri;
1270
1271         /* Parse PRI. */
1272         if (msg[0] != '<' || !isdigit(msg[1])) {
1273                 dprintf("Invalid PRI from %s\n", from);
1274                 return;
1275         }
1276         for (i = 2; i <= 4; i++) {
1277                 if (msg[i] == '>')
1278                         break;
1279                 if (!isdigit(msg[i])) {
1280                         dprintf("Invalid PRI header from %s\n", from);
1281                         return;
1282                 }
1283         }
1284         if (msg[i] != '>') {
1285                 dprintf("Invalid PRI header from %s\n", from);
1286                 return;
1287         }
1288         errno = 0;
1289         n = strtol(msg + 1, &q, 10);
1290         if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) {
1291                 dprintf("Invalid PRI %ld from %s: %s\n",
1292                     n, from, strerror(errno));
1293                 return;
1294         }
1295         pri = n;
1296         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1297                 pri = DEFUPRI;
1298
1299         /*
1300          * Don't allow users to log kernel messages.
1301          * NOTE: since LOG_KERN == 0 this will also match
1302          *       messages with no facility specified.
1303          */
1304         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
1305                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
1306
1307         /* Parse VERSION. */
1308         msg += i + 1;
1309         if (msg[0] == '1' && msg[1] == ' ')
1310                 parsemsg_rfc5424(from, pri, msg + 2);
1311         else
1312                 parsemsg_rfc3164(from, pri, msg);
1313 }
1314
1315 /*
1316  * Read /dev/klog while data are available, split into lines.
1317  */
1318 static int
1319 socklist_recv_file(struct socklist *sl)
1320 {
1321         char *p, *q, line[MAXLINE + 1];
1322         int len, i;
1323
1324         len = 0;
1325         for (;;) {
1326                 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len);
1327                 if (i > 0) {
1328                         line[i + len] = '\0';
1329                 } else {
1330                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
1331                                 logerror("klog");
1332                                 close(sl->sl_socket);
1333                                 sl->sl_socket = -1;
1334                         }
1335                         break;
1336                 }
1337
1338                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
1339                         *q = '\0';
1340                         printsys(p);
1341                 }
1342                 len = strlen(p);
1343                 if (len >= MAXLINE - 1) {
1344                         printsys(p);
1345                         len = 0;
1346                 }
1347                 if (len > 0)
1348                         memmove(line, p, len + 1);
1349         }
1350         if (len > 0)
1351                 printsys(line);
1352
1353         return (len);
1354 }
1355
1356 /*
1357  * Take a raw input line from /dev/klog, format similar to syslog().
1358  */
1359 static void
1360 printsys(char *msg)
1361 {
1362         char *p, *q;
1363         long n;
1364         int flags, isprintf, pri;
1365
1366         flags = SYNC_FILE;      /* fsync after write */
1367         p = msg;
1368         pri = DEFSPRI;
1369         isprintf = 1;
1370         if (*p == '<') {
1371                 errno = 0;
1372                 n = strtol(p + 1, &q, 10);
1373                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
1374                         p = q + 1;
1375                         pri = n;
1376                         isprintf = 0;
1377                 }
1378         }
1379         /*
1380          * Kernel printf's and LOG_CONSOLE messages have been displayed
1381          * on the console already.
1382          */
1383         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
1384                 flags |= IGN_CONS;
1385         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1386                 pri = DEFSPRI;
1387         logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags);
1388 }
1389
1390 static time_t   now;
1391
1392 /*
1393  * Match a program or host name against a specification.
1394  * Return a non-0 value if the message must be ignored
1395  * based on the specification.
1396  */
1397 static int
1398 skip_message(const char *name, const char *spec, int checkcase)
1399 {
1400         const char *s;
1401         char prev, next;
1402         int exclude = 0;
1403         /* Behaviour on explicit match */
1404
1405         if (spec == NULL)
1406                 return 0;
1407         switch (*spec) {
1408         case '-':
1409                 exclude = 1;
1410                 /*FALLTHROUGH*/
1411         case '+':
1412                 spec++;
1413                 break;
1414         default:
1415                 break;
1416         }
1417         if (checkcase)
1418                 s = strstr (spec, name);
1419         else
1420                 s = strcasestr (spec, name);
1421
1422         if (s != NULL) {
1423                 prev = (s == spec ? ',' : *(s - 1));
1424                 next = *(s + strlen (name));
1425
1426                 if (prev == ',' && (next == '\0' || next == ','))
1427                         /* Explicit match: skip iff the spec is an
1428                            exclusive one. */
1429                         return exclude;
1430         }
1431
1432         /* No explicit match for this name: skip the message iff
1433            the spec is an inclusive one. */
1434         return !exclude;
1435 }
1436
1437 /*
1438  * Logs a message to the appropriate log files, users, etc. based on the
1439  * priority. Log messages are always formatted according to RFC 3164,
1440  * even if they were in RFC 5424 format originally, The MSGID and
1441  * STRUCTURED-DATA fields are thus discarded for the time being.
1442  */
1443 static void
1444 logmsg(int pri, const struct logtime *timestamp, const char *hostname,
1445     const char *app_name, const char *procid, const char *msgid,
1446     const char *structured_data, const char *msg, int flags)
1447 {
1448         struct timeval tv;
1449         struct logtime timestamp_now;
1450         struct filed *f;
1451         size_t savedlen;
1452         int fac, prilev;
1453         char saved[MAXSVLINE];
1454
1455         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
1456             pri, flags, hostname, msg);
1457
1458         (void)gettimeofday(&tv, NULL);
1459         now = tv.tv_sec;
1460         if (timestamp == NULL) {
1461                 localtime_r(&now, &timestamp_now.tm);
1462                 timestamp_now.usec = tv.tv_usec;
1463                 timestamp = &timestamp_now;
1464         }
1465
1466         /* extract facility and priority level */
1467         if (flags & MARK)
1468                 fac = LOG_NFACILITIES;
1469         else
1470                 fac = LOG_FAC(pri);
1471
1472         /* Check maximum facility number. */
1473         if (fac > LOG_NFACILITIES)
1474                 return;
1475
1476         prilev = LOG_PRI(pri);
1477
1478         /* log the message to the particular outputs */
1479         if (!Initialized) {
1480                 f = &consfile;
1481                 /*
1482                  * Open in non-blocking mode to avoid hangs during open
1483                  * and close(waiting for the port to drain).
1484                  */
1485                 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
1486
1487                 if (f->f_file >= 0) {
1488                         f->f_lasttime = *timestamp;
1489                         fprintlog_first(f, hostname, app_name, procid, msgid,
1490                             structured_data, msg, flags);
1491                         close(f->f_file);
1492                         f->f_file = -1;
1493                 }
1494                 return;
1495         }
1496
1497         /*
1498          * Store all of the fields of the message, except the timestamp,
1499          * in a single string. This string is used to detect duplicate
1500          * messages.
1501          */
1502         assert(hostname != NULL);
1503         assert(msg != NULL);
1504         savedlen = snprintf(saved, sizeof(saved),
1505             "%d %s %s %s %s %s %s", pri, hostname,
1506             app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid,
1507             msgid == NULL ? "-" : msgid,
1508             structured_data == NULL ? "-" : structured_data, msg);
1509
1510         STAILQ_FOREACH(f, &fhead, next) {
1511                 /* skip messages that are incorrect priority */
1512                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
1513                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
1514                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
1515                      )
1516                     || f->f_pmask[fac] == INTERNAL_NOPRI)
1517                         continue;
1518
1519                 /* skip messages with the incorrect hostname */
1520                 if (skip_message(hostname, f->f_host, 0))
1521                         continue;
1522
1523                 /* skip messages with the incorrect program name */
1524                 if (skip_message(app_name == NULL ? "" : app_name,
1525                     f->f_program, 1))
1526                         continue;
1527
1528                 /* skip message to console if it has already been printed */
1529                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1530                         continue;
1531
1532                 /* don't output marks to recently written files */
1533                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1534                         continue;
1535
1536                 /*
1537                  * suppress duplicate lines to this file
1538                  */
1539                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1540                     (flags & MARK) == 0 && savedlen == f->f_prevlen &&
1541                     strcmp(saved, f->f_prevline) == 0) {
1542                         f->f_lasttime = *timestamp;
1543                         f->f_prevcount++;
1544                         dprintf("msg repeated %d times, %ld sec of %d\n",
1545                             f->f_prevcount, (long)(now - f->f_time),
1546                             repeatinterval[f->f_repeatcount]);
1547                         /*
1548                          * If domark would have logged this by now,
1549                          * flush it now (so we don't hold isolated messages),
1550                          * but back off so we'll flush less often
1551                          * in the future.
1552                          */
1553                         if (now > REPEATTIME(f)) {
1554                                 fprintlog_successive(f, flags);
1555                                 BACKOFF(f);
1556                         }
1557                 } else {
1558                         /* new line, save it */
1559                         if (f->f_prevcount)
1560                                 fprintlog_successive(f, 0);
1561                         f->f_repeatcount = 0;
1562                         f->f_prevpri = pri;
1563                         f->f_lasttime = *timestamp;
1564                         static_assert(sizeof(f->f_prevline) == sizeof(saved),
1565                             "Space to store saved line incorrect");
1566                         (void)strcpy(f->f_prevline, saved);
1567                         f->f_prevlen = savedlen;
1568                         fprintlog_first(f, hostname, app_name, procid, msgid,
1569                             structured_data, msg, flags);
1570                 }
1571         }
1572 }
1573
1574 static void
1575 dofsync(void)
1576 {
1577         struct filed *f;
1578
1579         STAILQ_FOREACH(f, &fhead, next) {
1580                 if ((f->f_type == F_FILE) &&
1581                     (f->f_flags & FFLAG_NEEDSYNC)) {
1582                         f->f_flags &= ~FFLAG_NEEDSYNC;
1583                         (void)fsync(f->f_file);
1584                 }
1585         }
1586 }
1587
1588 /*
1589  * List of iovecs to which entries can be appended.
1590  * Used for constructing the message to be logged.
1591  */
1592 struct iovlist {
1593         struct iovec    iov[TTYMSG_IOV_MAX];
1594         size_t          iovcnt;
1595         size_t          totalsize;
1596 };
1597
1598 static void
1599 iovlist_init(struct iovlist *il)
1600 {
1601
1602         il->iovcnt = 0;
1603         il->totalsize = 0;
1604 }
1605
1606 static void
1607 iovlist_append(struct iovlist *il, const char *str)
1608 {
1609         size_t size;
1610
1611         /* Discard components if we've run out of iovecs. */
1612         if (il->iovcnt < nitems(il->iov)) {
1613                 size = strlen(str);
1614                 il->iov[il->iovcnt++] = (struct iovec){
1615                         .iov_base       = __DECONST(char *, str),
1616                         .iov_len        = size,
1617                 };
1618                 il->totalsize += size;
1619         }
1620 }
1621
1622 #if defined(INET) || defined(INET6)
1623 static void
1624 iovlist_truncate(struct iovlist *il, size_t size)
1625 {
1626         struct iovec *last;
1627         size_t diff;
1628
1629         while (il->totalsize > size) {
1630                 diff = il->totalsize - size;
1631                 last = &il->iov[il->iovcnt - 1];
1632                 if (diff >= last->iov_len) {
1633                         /* Remove the last iovec entirely. */
1634                         --il->iovcnt;
1635                         il->totalsize -= last->iov_len;
1636                 } else {
1637                         /* Remove the last iovec partially. */
1638                         last->iov_len -= diff;
1639                         il->totalsize -= diff;
1640                 }
1641         }
1642 }
1643 #endif
1644
1645 static void
1646 fprintlog_write(struct filed *f, struct iovlist *il, int flags)
1647 {
1648         struct msghdr msghdr;
1649         struct addrinfo *r;
1650         struct socklist *sl;
1651         const char *msgret;
1652         ssize_t lsent;
1653
1654         switch (f->f_type) {
1655         case F_FORW:
1656                 /* Truncate messages to RFC 5426 recommended size. */
1657                 dprintf(" %s", f->fu_forw_hname);
1658                 switch (f->fu_forw_addr->ai_family) {
1659 #ifdef INET
1660                 case AF_INET:
1661                         dprintf(":%d\n",
1662                             ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port));
1663                         iovlist_truncate(il, 480);
1664                         break;
1665 #endif
1666 #ifdef INET6
1667                 case AF_INET6:
1668                         dprintf(":%d\n",
1669                             ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port));
1670                         iovlist_truncate(il, 1180);
1671                         break;
1672 #endif
1673                 default:
1674                         dprintf("\n");
1675                 }
1676
1677                 lsent = 0;
1678                 for (r = f->fu_forw_addr; r; r = r->ai_next) {
1679                         memset(&msghdr, 0, sizeof(msghdr));
1680                         msghdr.msg_name = r->ai_addr;
1681                         msghdr.msg_namelen = r->ai_addrlen;
1682                         msghdr.msg_iov = il->iov;
1683                         msghdr.msg_iovlen = il->iovcnt;
1684                         STAILQ_FOREACH(sl, &shead, next) {
1685                                 if (sl->sl_socket < 0)
1686                                         continue;
1687                                 if (sl->sl_sa != NULL &&
1688                                     (sl->sl_family == AF_LOCAL ||
1689                                      sl->sl_family == AF_UNSPEC))
1690                                         continue;
1691                                 lsent = sendmsg(sl->sl_socket, &msghdr, 0);
1692                                 if (lsent == (ssize_t)il->totalsize)
1693                                         break;
1694                         }
1695                         if (lsent == (ssize_t)il->totalsize && !send_to_all)
1696                                 break;
1697                 }
1698                 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize);
1699                 if (lsent != (ssize_t)il->totalsize) {
1700                         int e = errno;
1701                         logerror("sendto");
1702                         errno = e;
1703                         switch (errno) {
1704                         case ENOBUFS:
1705                         case ENETDOWN:
1706                         case ENETUNREACH:
1707                         case EHOSTUNREACH:
1708                         case EHOSTDOWN:
1709                         case EADDRNOTAVAIL:
1710                                 break;
1711                         /* case EBADF: */
1712                         /* case EACCES: */
1713                         /* case ENOTSOCK: */
1714                         /* case EFAULT: */
1715                         /* case EMSGSIZE: */
1716                         /* case EAGAIN: */
1717                         /* case ENOBUFS: */
1718                         /* case ECONNREFUSED: */
1719                         default:
1720                                 dprintf("removing entry: errno=%d\n", e);
1721                                 f->f_type = F_UNUSED;
1722                                 break;
1723                         }
1724                 }
1725                 break;
1726
1727         case F_FILE:
1728                 dprintf(" %s\n", f->fu_fname);
1729                 iovlist_append(il, "\n");
1730                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1731                         /*
1732                          * If writev(2) fails for potentially transient errors
1733                          * like the filesystem being full, ignore it.
1734                          * Otherwise remove this logfile from the list.
1735                          */
1736                         if (errno != ENOSPC) {
1737                                 int e = errno;
1738                                 close_filed(f);
1739                                 errno = e;
1740                                 logerror(f->fu_fname);
1741                         }
1742                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1743                         f->f_flags |= FFLAG_NEEDSYNC;
1744                         needdofsync = 1;
1745                 }
1746                 break;
1747
1748         case F_PIPE:
1749                 dprintf(" %s\n", f->fu_pipe_pname);
1750                 iovlist_append(il, "\n");
1751                 if (f->fu_pipe_pid == 0) {
1752                         if ((f->f_file = p_open(f->fu_pipe_pname,
1753                                                 &f->fu_pipe_pid)) < 0) {
1754                                 logerror(f->fu_pipe_pname);
1755                                 break;
1756                         }
1757                 }
1758                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1759                         int e = errno;
1760
1761                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
1762                         close_filed(f);
1763                         errno = e;
1764                         logerror(f->fu_pipe_pname);
1765                 }
1766                 break;
1767
1768         case F_CONSOLE:
1769                 if (flags & IGN_CONS) {
1770                         dprintf(" (ignored)\n");
1771                         break;
1772                 }
1773                 /* FALLTHROUGH */
1774
1775         case F_TTY:
1776                 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname);
1777                 iovlist_append(il, "\r\n");
1778                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1779                 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) {
1780                         f->f_type = F_UNUSED;
1781                         logerror(msgret);
1782                 }
1783                 break;
1784
1785         case F_USERS:
1786         case F_WALL:
1787                 dprintf("\n");
1788                 iovlist_append(il, "\r\n");
1789                 wallmsg(f, il->iov, il->iovcnt);
1790                 break;
1791         }
1792 }
1793
1794 static void
1795 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name,
1796     const char *procid, const char *msgid, const char *structured_data,
1797     const char *msg, int flags)
1798 {
1799         struct iovlist il;
1800         suseconds_t usec;
1801         int i;
1802         char timebuf[33], priority_number[5];
1803
1804         iovlist_init(&il);
1805         if (f->f_type == F_WALL)
1806                 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n");
1807         iovlist_append(&il, "<");
1808         snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri);
1809         iovlist_append(&il, priority_number);
1810         iovlist_append(&il, ">1 ");
1811         if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z",
1812             &f->f_lasttime.tm) == sizeof(timebuf) - 2) {
1813                 /* Add colon to the time zone offset, which %z doesn't do. */
1814                 timebuf[32] = '\0';
1815                 timebuf[31] = timebuf[30];
1816                 timebuf[30] = timebuf[29];
1817                 timebuf[29] = ':';
1818
1819                 /* Overwrite space for microseconds with actual value. */
1820                 usec = f->f_lasttime.usec;
1821                 for (i = 25; i >= 20; --i) {
1822                         timebuf[i] = usec % 10 + '0';
1823                         usec /= 10;
1824                 }
1825                 iovlist_append(&il, timebuf);
1826         } else
1827                 iovlist_append(&il, "-");
1828         iovlist_append(&il, " ");
1829         iovlist_append(&il, hostname);
1830         iovlist_append(&il, " ");
1831         iovlist_append(&il, app_name == NULL ? "-" : app_name);
1832         iovlist_append(&il, " ");
1833         iovlist_append(&il, procid == NULL ? "-" : procid);
1834         iovlist_append(&il, " ");
1835         iovlist_append(&il, msgid == NULL ? "-" : msgid);
1836         iovlist_append(&il, " ");
1837         iovlist_append(&il, structured_data == NULL ? "-" : structured_data);
1838         iovlist_append(&il, " ");
1839         iovlist_append(&il, msg);
1840
1841         fprintlog_write(f, &il, flags);
1842 }
1843
1844 static void
1845 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name,
1846     const char *procid, const char *msg, int flags)
1847 {
1848         struct iovlist il;
1849         const CODE *c;
1850         int facility, priority;
1851         char timebuf[RFC3164_DATELEN + 1], facility_number[5],
1852             priority_number[5];
1853         bool facility_found, priority_found;
1854
1855         if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT,
1856             &f->f_lasttime.tm) == 0)
1857                 timebuf[0] = '\0';
1858
1859         iovlist_init(&il);
1860         switch (f->f_type) {
1861         case F_FORW:
1862                 /* Message forwarded over the network. */
1863                 iovlist_append(&il, "<");
1864                 snprintf(priority_number, sizeof(priority_number), "%d",
1865                     f->f_prevpri);
1866                 iovlist_append(&il, priority_number);
1867                 iovlist_append(&il, ">");
1868                 iovlist_append(&il, timebuf);
1869                 if (strcasecmp(hostname, LocalHostName) != 0) {
1870                         iovlist_append(&il, " Forwarded from ");
1871                         iovlist_append(&il, hostname);
1872                         iovlist_append(&il, ":");
1873                 }
1874                 iovlist_append(&il, " ");
1875                 break;
1876
1877         case F_WALL:
1878                 /* Message written to terminals. */
1879                 iovlist_append(&il, "\r\n\aMessage from syslogd@");
1880                 iovlist_append(&il, hostname);
1881                 iovlist_append(&il, " at ");
1882                 iovlist_append(&il, timebuf);
1883                 iovlist_append(&il, " ...\r\n");
1884                 break;
1885
1886         default:
1887                 /* Message written to files. */
1888                 iovlist_append(&il, timebuf);
1889                 iovlist_append(&il, " ");
1890
1891                 if (LogFacPri) {
1892                         iovlist_append(&il, "<");
1893
1894                         facility = f->f_prevpri & LOG_FACMASK;
1895                         facility_found = false;
1896                         if (LogFacPri > 1) {
1897                                 for (c = facilitynames; c->c_name; c++) {
1898                                         if (c->c_val == facility) {
1899                                                 iovlist_append(&il, c->c_name);
1900                                                 facility_found = true;
1901                                                 break;
1902                                         }
1903                                 }
1904                         }
1905                         if (!facility_found) {
1906                                 snprintf(facility_number,
1907                                     sizeof(facility_number), "%d",
1908                                     LOG_FAC(facility));
1909                                 iovlist_append(&il, facility_number);
1910                         }
1911
1912                         iovlist_append(&il, ".");
1913
1914                         priority = LOG_PRI(f->f_prevpri);
1915                         priority_found = false;
1916                         if (LogFacPri > 1) {
1917                                 for (c = prioritynames; c->c_name; c++) {
1918                                         if (c->c_val == priority) {
1919                                                 iovlist_append(&il, c->c_name);
1920                                                 priority_found = true;
1921                                                 break;
1922                                         }
1923                                 }
1924                         }
1925                         if (!priority_found) {
1926                                 snprintf(priority_number,
1927                                     sizeof(priority_number), "%d", priority);
1928                                 iovlist_append(&il, priority_number);
1929                         }
1930
1931                         iovlist_append(&il, "> ");
1932                 }
1933
1934                 iovlist_append(&il, hostname);
1935                 iovlist_append(&il, " ");
1936                 break;
1937         }
1938
1939         /* Message body with application name and process ID prefixed. */
1940         if (app_name != NULL) {
1941                 iovlist_append(&il, app_name);
1942                 if (procid != NULL) {
1943                         iovlist_append(&il, "[");
1944                         iovlist_append(&il, procid);
1945                         iovlist_append(&il, "]");
1946                 }
1947                 iovlist_append(&il, ": ");
1948         }
1949         iovlist_append(&il, msg);
1950
1951         fprintlog_write(f, &il, flags);
1952 }
1953
1954 static void
1955 fprintlog_first(struct filed *f, const char *hostname, const char *app_name,
1956     const char *procid, const char *msgid __unused,
1957     const char *structured_data __unused, const char *msg, int flags)
1958 {
1959
1960         dprintf("Logging to %s", TypeNames[f->f_type]);
1961         f->f_time = now;
1962         f->f_prevcount = 0;
1963         if (f->f_type == F_UNUSED) {
1964                 dprintf("\n");
1965                 return;
1966         }
1967
1968         if (RFC3164OutputFormat)
1969                 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags);
1970         else
1971                 fprintlog_rfc5424(f, hostname, app_name, procid, msgid,
1972                     structured_data, msg, flags);
1973 }
1974
1975 /*
1976  * Prints a message to a log file that the previously logged message was
1977  * received multiple times.
1978  */
1979 static void
1980 fprintlog_successive(struct filed *f, int flags)
1981 {
1982         char msg[100];
1983
1984         assert(f->f_prevcount > 0);
1985         snprintf(msg, sizeof(msg), "last message repeated %d times",
1986             f->f_prevcount);
1987         fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg,
1988             flags);
1989 }
1990
1991 /*
1992  *  WALLMSG -- Write a message to the world at large
1993  *
1994  *      Write the specified message to either the entire
1995  *      world, or a list of approved users.
1996  */
1997 static void
1998 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1999 {
2000         static int reenter;                     /* avoid calling ourselves */
2001         struct utmpx *ut;
2002         int i;
2003         const char *p;
2004
2005         if (reenter++)
2006                 return;
2007         setutxent();
2008         /* NOSTRICT */
2009         while ((ut = getutxent()) != NULL) {
2010                 if (ut->ut_type != USER_PROCESS)
2011                         continue;
2012                 if (f->f_type == F_WALL) {
2013                         if ((p = ttymsg(iov, iovlen, ut->ut_line,
2014                             TTYMSGTIME)) != NULL) {
2015                                 errno = 0;      /* already in msg */
2016                                 logerror(p);
2017                         }
2018                         continue;
2019                 }
2020                 /* should we send the message to this user? */
2021                 for (i = 0; i < MAXUNAMES; i++) {
2022                         if (!f->fu_uname[i][0])
2023                                 break;
2024                         if (!strcmp(f->fu_uname[i], ut->ut_user)) {
2025                                 if ((p = ttymsg_check(iov, iovlen, ut->ut_line,
2026                                     TTYMSGTIME)) != NULL) {
2027                                         errno = 0;      /* already in msg */
2028                                         logerror(p);
2029                                 }
2030                                 break;
2031                         }
2032                 }
2033         }
2034         endutxent();
2035         reenter = 0;
2036 }
2037
2038 /*
2039  * Wrapper routine for ttymsg() that checks the terminal for messages enabled.
2040  */
2041 static const char *
2042 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout)
2043 {
2044         static char device[1024];
2045         static char errbuf[1024];
2046         struct stat sb;
2047
2048         (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);
2049
2050         if (stat(device, &sb) < 0) {
2051                 (void) snprintf(errbuf, sizeof(errbuf),
2052                     "%s: %s", device, strerror(errno));
2053                 return (errbuf);
2054         }
2055         if ((sb.st_mode & S_IWGRP) == 0)
2056                 /* Messages disabled. */
2057                 return (NULL);
2058         return ttymsg(iov, iovcnt, line, tmout);
2059 }
2060
2061 static void
2062 reapchild(int signo __unused)
2063 {
2064         int status;
2065         pid_t pid;
2066         struct filed *f;
2067
2068         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
2069                 /* First, look if it's a process from the dead queue. */
2070                 if (deadq_removebypid(pid))
2071                         continue;
2072
2073                 /* Now, look in list of active processes. */
2074                 STAILQ_FOREACH(f, &fhead, next) {
2075                         if (f->f_type == F_PIPE &&
2076                             f->fu_pipe_pid == pid) {
2077                                 close_filed(f);
2078                                 log_deadchild(pid, status, f->fu_pipe_pname);
2079                                 break;
2080                         }
2081                 }
2082         }
2083         WantReapchild = 0;
2084 }
2085
2086 /*
2087  * Return a printable representation of a host address.
2088  */
2089 static const char *
2090 cvthname(struct sockaddr *f)
2091 {
2092         int error, hl;
2093         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
2094
2095         dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len);
2096         error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0,
2097                     NI_NUMERICHOST);
2098         if (error) {
2099                 dprintf("Malformed from address %s\n", gai_strerror(error));
2100                 return ("???");
2101         }
2102         dprintf("cvthname(%s)\n", ip);
2103
2104         if (!resolve)
2105                 return (ip);
2106
2107         error = getnameinfo(f, f->sa_len, hname, sizeof(hname),
2108                     NULL, 0, NI_NAMEREQD);
2109         if (error) {
2110                 dprintf("Host name for your address (%s) unknown\n", ip);
2111                 return (ip);
2112         }
2113         hl = strlen(hname);
2114         if (hl > 0 && hname[hl-1] == '.')
2115                 hname[--hl] = '\0';
2116         trimdomain(hname, hl);
2117         return (hname);
2118 }
2119
2120 static void
2121 dodie(int signo)
2122 {
2123
2124         WantDie = signo;
2125 }
2126
2127 static void
2128 domark(int signo __unused)
2129 {
2130
2131         MarkSet = 1;
2132 }
2133
2134 /*
2135  * Print syslogd errors some place.
2136  */
2137 static void
2138 logerror(const char *msg)
2139 {
2140         char buf[512];
2141         static int recursed = 0;
2142
2143         /* If there's an error while trying to log an error, give up. */
2144         if (recursed)
2145                 return;
2146         recursed++;
2147         if (errno != 0) {
2148                 (void)snprintf(buf, sizeof(buf), "%s: %s", msg,
2149                     strerror(errno));
2150                 msg = buf;
2151         }
2152         errno = 0;
2153         dprintf("%s\n", buf);
2154         logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL,
2155             NULL, msg, 0);
2156         recursed--;
2157 }
2158
2159 static void
2160 die(int signo)
2161 {
2162         struct filed *f;
2163         struct socklist *sl;
2164         char buf[100];
2165
2166         STAILQ_FOREACH(f, &fhead, next) {
2167                 /* flush any pending output */
2168                 if (f->f_prevcount)
2169                         fprintlog_successive(f, 0);
2170                 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0)
2171                         close_filed(f);
2172         }
2173         if (signo) {
2174                 dprintf("syslogd: exiting on signal %d\n", signo);
2175                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
2176                 errno = 0;
2177                 logerror(buf);
2178         }
2179         STAILQ_FOREACH(sl, &shead, next) {
2180                 if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL)
2181                         unlink(sl->sl_peer->pe_name);
2182         }
2183         pidfile_remove(pfh);
2184
2185         exit(1);
2186 }
2187
2188 static int
2189 configfiles(const struct dirent *dp)
2190 {
2191         const char *p;
2192         size_t ext_len;
2193
2194         if (dp->d_name[0] == '.')
2195                 return (0);
2196
2197         ext_len = sizeof(include_ext) -1;
2198
2199         if (dp->d_namlen <= ext_len)
2200                 return (0);
2201
2202         p = &dp->d_name[dp->d_namlen - ext_len];
2203         if (strcmp(p, include_ext) != 0)
2204                 return (0);
2205
2206         return (1);
2207 }
2208
2209 static void
2210 readconfigfile(FILE *cf, int allow_includes)
2211 {
2212         FILE *cf2;
2213         struct filed *f;
2214         struct dirent **ent;
2215         char cline[LINE_MAX];
2216         char host[MAXHOSTNAMELEN];
2217         char prog[LINE_MAX];
2218         char file[MAXPATHLEN];
2219         char *p, *tmp;
2220         int i, nents;
2221         size_t include_len;
2222
2223         /*
2224          *  Foreach line in the conf table, open that file.
2225          */
2226         include_len = sizeof(include_str) -1;
2227         (void)strlcpy(host, "*", sizeof(host));
2228         (void)strlcpy(prog, "*", sizeof(prog));
2229         while (fgets(cline, sizeof(cline), cf) != NULL) {
2230                 /*
2231                  * check for end-of-section, comments, strip off trailing
2232                  * spaces and newline character. #!prog is treated specially:
2233                  * following lines apply only to that program.
2234                  */
2235                 for (p = cline; isspace(*p); ++p)
2236                         continue;
2237                 if (*p == 0)
2238                         continue;
2239                 if (allow_includes &&
2240                     strncmp(p, include_str, include_len) == 0 &&
2241                     isspace(p[include_len])) {
2242                         p += include_len;
2243                         while (isspace(*p))
2244                                 p++;
2245                         tmp = p;
2246                         while (*tmp != '\0' && !isspace(*tmp))
2247                                 tmp++;
2248                         *tmp = '\0';
2249                         dprintf("Trying to include files in '%s'\n", p);
2250                         nents = scandir(p, &ent, configfiles, alphasort);
2251                         if (nents == -1) {
2252                                 dprintf("Unable to open '%s': %s\n", p,
2253                                     strerror(errno));
2254                                 continue;
2255                         }
2256                         for (i = 0; i < nents; i++) {
2257                                 if (snprintf(file, sizeof(file), "%s/%s", p,
2258                                     ent[i]->d_name) >= (int)sizeof(file)) {
2259                                         dprintf("ignoring path too long: "
2260                                             "'%s/%s'\n", p, ent[i]->d_name);
2261                                         free(ent[i]);
2262                                         continue;
2263                                 }
2264                                 free(ent[i]);
2265                                 cf2 = fopen(file, "r");
2266                                 if (cf2 == NULL)
2267                                         continue;
2268                                 dprintf("reading %s\n", file);
2269                                 readconfigfile(cf2, 0);
2270                                 fclose(cf2);
2271                         }
2272                         free(ent);
2273                         continue;
2274                 }
2275                 if (*p == '#') {
2276                         p++;
2277                         if (*p != '!' && *p != '+' && *p != '-')
2278                                 continue;
2279                 }
2280                 if (*p == '+' || *p == '-') {
2281                         host[0] = *p++;
2282                         while (isspace(*p))
2283                                 p++;
2284                         if ((!*p) || (*p == '*')) {
2285                                 (void)strlcpy(host, "*", sizeof(host));
2286                                 continue;
2287                         }
2288                         if (*p == '@')
2289                                 p = LocalHostName;
2290                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
2291                                 if (!isalnum(*p) && *p != '.' && *p != '-'
2292                                     && *p != ',' && *p != ':' && *p != '%')
2293                                         break;
2294                                 host[i] = *p++;
2295                         }
2296                         host[i] = '\0';
2297                         continue;
2298                 }
2299                 if (*p == '!') {
2300                         p++;
2301                         while (isspace(*p)) p++;
2302                         if ((!*p) || (*p == '*')) {
2303                                 (void)strlcpy(prog, "*", sizeof(prog));
2304                                 continue;
2305                         }
2306                         for (i = 0; i < LINE_MAX - 1; i++) {
2307                                 if (!isprint(p[i]) || isspace(p[i]))
2308                                         break;
2309                                 prog[i] = p[i];
2310                         }
2311                         prog[i] = 0;
2312                         continue;
2313                 }
2314                 for (p = cline + 1; *p != '\0'; p++) {
2315                         if (*p != '#')
2316                                 continue;
2317                         if (*(p - 1) == '\\') {
2318                                 strcpy(p - 1, p);
2319                                 p--;
2320                                 continue;
2321                         }
2322                         *p = '\0';
2323                         break;
2324                 }
2325                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
2326                         cline[i] = '\0';
2327                 f = cfline(cline, prog, host);
2328                 if (f != NULL)
2329                         addfile(f);
2330                 free(f);
2331         }
2332 }
2333
2334 static void
2335 sighandler(int signo)
2336 {
2337
2338         /* Send an wake-up signal to the select() loop. */
2339         write(sigpipe[1], &signo, sizeof(signo));
2340 }
2341
2342 /*
2343  *  INIT -- Initialize syslogd from configuration table
2344  */
2345 static void
2346 init(int signo)
2347 {
2348         int i;
2349         FILE *cf;
2350         struct filed *f;
2351         char *p;
2352         char oldLocalHostName[MAXHOSTNAMELEN];
2353         char hostMsg[2*MAXHOSTNAMELEN+40];
2354         char bootfileMsg[LINE_MAX];
2355
2356         dprintf("init\n");
2357         WantInitialize = 0;
2358
2359         /*
2360          * Load hostname (may have changed).
2361          */
2362         if (signo != 0)
2363                 (void)strlcpy(oldLocalHostName, LocalHostName,
2364                     sizeof(oldLocalHostName));
2365         if (gethostname(LocalHostName, sizeof(LocalHostName)))
2366                 err(EX_OSERR, "gethostname() failed");
2367         if ((p = strchr(LocalHostName, '.')) != NULL) {
2368                 /* RFC 5424 prefers logging FQDNs. */
2369                 if (RFC3164OutputFormat)
2370                         *p = '\0';
2371                 LocalDomain = p + 1;
2372         } else {
2373                 LocalDomain = "";
2374         }
2375
2376         /*
2377          * Load / reload timezone data (in case it changed).
2378          *
2379          * Just calling tzset() again does not work, the timezone code
2380          * caches the result.  However, by setting the TZ variable, one
2381          * can defeat the caching and have the timezone code really
2382          * reload the timezone data.  Respect any initial setting of
2383          * TZ, in case the system is configured specially.
2384          */
2385         dprintf("loading timezone data via tzset()\n");
2386         if (getenv("TZ")) {
2387                 tzset();
2388         } else {
2389                 setenv("TZ", ":/etc/localtime", 1);
2390                 tzset();
2391                 unsetenv("TZ");
2392         }
2393
2394         /*
2395          *  Close all open log files.
2396          */
2397         Initialized = 0;
2398         STAILQ_FOREACH(f, &fhead, next) {
2399                 /* flush any pending output */
2400                 if (f->f_prevcount)
2401                         fprintlog_successive(f, 0);
2402
2403                 switch (f->f_type) {
2404                 case F_FILE:
2405                 case F_FORW:
2406                 case F_CONSOLE:
2407                 case F_TTY:
2408                         close_filed(f);
2409                         break;
2410                 case F_PIPE:
2411                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
2412                         close_filed(f);
2413                         break;
2414                 }
2415         }
2416         while(!STAILQ_EMPTY(&fhead)) {
2417                 f = STAILQ_FIRST(&fhead);
2418                 STAILQ_REMOVE_HEAD(&fhead, next);
2419                 free(f->f_program);
2420                 free(f->f_host);
2421                 free(f);
2422         }
2423
2424         /* open the configuration file */
2425         if ((cf = fopen(ConfFile, "r")) == NULL) {
2426                 dprintf("cannot open %s\n", ConfFile);
2427                 f = cfline("*.ERR\t/dev/console", "*", "*");
2428                 if (f != NULL)
2429                         addfile(f);
2430                 free(f);
2431                 f = cfline("*.PANIC\t*", "*", "*");
2432                 if (f != NULL)
2433                         addfile(f);
2434                 free(f);
2435                 Initialized = 1;
2436
2437                 return;
2438         }
2439
2440         readconfigfile(cf, 1);
2441
2442         /* close the configuration file */
2443         (void)fclose(cf);
2444
2445         Initialized = 1;
2446
2447         if (Debug) {
2448                 int port;
2449                 STAILQ_FOREACH(f, &fhead, next) {
2450                         for (i = 0; i <= LOG_NFACILITIES; i++)
2451                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
2452                                         printf("X ");
2453                                 else
2454                                         printf("%d ", f->f_pmask[i]);
2455                         printf("%s: ", TypeNames[f->f_type]);
2456                         switch (f->f_type) {
2457                         case F_FILE:
2458                                 printf("%s", f->fu_fname);
2459                                 break;
2460
2461                         case F_CONSOLE:
2462                         case F_TTY:
2463                                 printf("%s%s", _PATH_DEV, f->fu_fname);
2464                                 break;
2465
2466                         case F_FORW:
2467                                 switch (f->fu_forw_addr->ai_family) {
2468 #ifdef INET
2469                                 case AF_INET:
2470                                         port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port);
2471                                         break;
2472 #endif
2473 #ifdef INET6
2474                                 case AF_INET6:
2475                                         port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port);
2476                                         break;
2477 #endif
2478                                 default:
2479                                         port = 0;
2480                                 }
2481                                 if (port != 514) {
2482                                         printf("%s:%d",
2483                                                 f->fu_forw_hname, port);
2484                                 } else {
2485                                         printf("%s", f->fu_forw_hname);
2486                                 }
2487                                 break;
2488
2489                         case F_PIPE:
2490                                 printf("%s", f->fu_pipe_pname);
2491                                 break;
2492
2493                         case F_USERS:
2494                                 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++)
2495                                         printf("%s, ", f->fu_uname[i]);
2496                                 break;
2497                         }
2498                         if (f->f_program)
2499                                 printf(" (%s)", f->f_program);
2500                         printf("\n");
2501                 }
2502         }
2503
2504         logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL,
2505             NULL, NULL, "restart", 0);
2506         dprintf("syslogd: restarted\n");
2507         /*
2508          * Log a change in hostname, but only on a restart.
2509          */
2510         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
2511                 (void)snprintf(hostMsg, sizeof(hostMsg),
2512                     "hostname changed, \"%s\" to \"%s\"",
2513                     oldLocalHostName, LocalHostName);
2514                 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd",
2515                     NULL, NULL, NULL, hostMsg, 0);
2516                 dprintf("%s\n", hostMsg);
2517         }
2518         /*
2519          * Log the kernel boot file if we aren't going to use it as
2520          * the prefix, and if this is *not* a restart.
2521          */
2522         if (signo == 0 && !use_bootfile) {
2523                 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
2524                     "kernel boot file is %s", bootfile);
2525                 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd",
2526                     NULL, NULL, NULL, bootfileMsg, 0);
2527                 dprintf("%s\n", bootfileMsg);
2528         }
2529 }
2530
2531 /*
2532  * Crack a configuration file line
2533  */
2534 static struct filed *
2535 cfline(const char *line, const char *prog, const char *host)
2536 {
2537         struct filed *f;
2538         struct addrinfo hints, *res;
2539         int error, i, pri, syncfile;
2540         const char *p, *q;
2541         char *bp;
2542         char buf[MAXLINE], ebuf[100];
2543
2544         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
2545
2546         f = calloc(1, sizeof(*f));
2547         if (f == NULL) {
2548                 logerror("malloc");
2549                 exit(1);
2550         }
2551         errno = 0;      /* keep strerror() stuff out of logerror messages */
2552
2553         for (i = 0; i <= LOG_NFACILITIES; i++)
2554                 f->f_pmask[i] = INTERNAL_NOPRI;
2555
2556         /* save hostname if any */
2557         if (host && *host == '*')
2558                 host = NULL;
2559         if (host) {
2560                 int hl;
2561
2562                 f->f_host = strdup(host);
2563                 if (f->f_host == NULL) {
2564                         logerror("strdup");
2565                         exit(1);
2566                 }
2567                 hl = strlen(f->f_host);
2568                 if (hl > 0 && f->f_host[hl-1] == '.')
2569                         f->f_host[--hl] = '\0';
2570                 trimdomain(f->f_host, hl);
2571         }
2572
2573         /* save program name if any */
2574         if (prog && *prog == '*')
2575                 prog = NULL;
2576         if (prog) {
2577                 f->f_program = strdup(prog);
2578                 if (f->f_program == NULL) {
2579                         logerror("strdup");
2580                         exit(1);
2581                 }
2582         }
2583
2584         /* scan through the list of selectors */
2585         for (p = line; *p && *p != '\t' && *p != ' ';) {
2586                 int pri_done;
2587                 int pri_cmp;
2588                 int pri_invert;
2589
2590                 /* find the end of this facility name list */
2591                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
2592                         continue;
2593
2594                 /* get the priority comparison */
2595                 pri_cmp = 0;
2596                 pri_done = 0;
2597                 pri_invert = 0;
2598                 if (*q == '!') {
2599                         pri_invert = 1;
2600                         q++;
2601                 }
2602                 while (!pri_done) {
2603                         switch (*q) {
2604                         case '<':
2605                                 pri_cmp |= PRI_LT;
2606                                 q++;
2607                                 break;
2608                         case '=':
2609                                 pri_cmp |= PRI_EQ;
2610                                 q++;
2611                                 break;
2612                         case '>':
2613                                 pri_cmp |= PRI_GT;
2614                                 q++;
2615                                 break;
2616                         default:
2617                                 pri_done++;
2618                                 break;
2619                         }
2620                 }
2621
2622                 /* collect priority name */
2623                 for (bp = buf; *q && !strchr("\t,; ", *q); )
2624                         *bp++ = *q++;
2625                 *bp = '\0';
2626
2627                 /* skip cruft */
2628                 while (strchr(",;", *q))
2629                         q++;
2630
2631                 /* decode priority name */
2632                 if (*buf == '*') {
2633                         pri = LOG_PRIMASK;
2634                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
2635                 } else {
2636                         /* Ignore trailing spaces. */
2637                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
2638                                 buf[i] = '\0';
2639
2640                         pri = decode(buf, prioritynames);
2641                         if (pri < 0) {
2642                                 errno = 0;
2643                                 (void)snprintf(ebuf, sizeof ebuf,
2644                                     "unknown priority name \"%s\"", buf);
2645                                 logerror(ebuf);
2646                                 free(f);
2647                                 return (NULL);
2648                         }
2649                 }
2650                 if (!pri_cmp)
2651                         pri_cmp = (UniquePriority)
2652                                   ? (PRI_EQ)
2653                                   : (PRI_EQ | PRI_GT)
2654                                   ;
2655                 if (pri_invert)
2656                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
2657
2658                 /* scan facilities */
2659                 while (*p && !strchr("\t.; ", *p)) {
2660                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
2661                                 *bp++ = *p++;
2662                         *bp = '\0';
2663
2664                         if (*buf == '*') {
2665                                 for (i = 0; i < LOG_NFACILITIES; i++) {
2666                                         f->f_pmask[i] = pri;
2667                                         f->f_pcmp[i] = pri_cmp;
2668                                 }
2669                         } else {
2670                                 i = decode(buf, facilitynames);
2671                                 if (i < 0) {
2672                                         errno = 0;
2673                                         (void)snprintf(ebuf, sizeof ebuf,
2674                                             "unknown facility name \"%s\"",
2675                                             buf);
2676                                         logerror(ebuf);
2677                                         free(f);
2678                                         return (NULL);
2679                                 }
2680                                 f->f_pmask[i >> 3] = pri;
2681                                 f->f_pcmp[i >> 3] = pri_cmp;
2682                         }
2683                         while (*p == ',' || *p == ' ')
2684                                 p++;
2685                 }
2686
2687                 p = q;
2688         }
2689
2690         /* skip to action part */
2691         while (*p == '\t' || *p == ' ')
2692                 p++;
2693
2694         if (*p == '-') {
2695                 syncfile = 0;
2696                 p++;
2697         } else
2698                 syncfile = 1;
2699
2700         switch (*p) {
2701         case '@':
2702                 {
2703                         char *tp;
2704                         char endkey = ':';
2705                         /*
2706                          * scan forward to see if there is a port defined.
2707                          * so we can't use strlcpy..
2708                          */
2709                         i = sizeof(f->fu_forw_hname);
2710                         tp = f->fu_forw_hname;
2711                         p++;
2712
2713                         /*
2714                          * an ipv6 address should start with a '[' in that case
2715                          * we should scan for a ']'
2716                          */
2717                         if (*p == '[') {
2718                                 p++;
2719                                 endkey = ']';
2720                         }
2721                         while (*p && (*p != endkey) && (i-- > 0)) {
2722                                 *tp++ = *p++;
2723                         }
2724                         if (endkey == ']' && *p == endkey)
2725                                 p++;
2726                         *tp = '\0';
2727                 }
2728                 /* See if we copied a domain and have a port */
2729                 if (*p == ':')
2730                         p++;
2731                 else
2732                         p = NULL;
2733
2734                 hints = (struct addrinfo){
2735                         .ai_family = family,
2736                         .ai_socktype = SOCK_DGRAM
2737                 };
2738                 error = getaddrinfo(f->fu_forw_hname,
2739                                 p ? p : "syslog", &hints, &res);
2740                 if (error) {
2741                         logerror(gai_strerror(error));
2742                         break;
2743                 }
2744                 f->fu_forw_addr = res;
2745                 f->f_type = F_FORW;
2746                 break;
2747
2748         case '/':
2749                 if ((f->f_file = open(p, logflags, 0600)) < 0) {
2750                         f->f_type = F_UNUSED;
2751                         logerror(p);
2752                         break;
2753                 }
2754                 if (syncfile)
2755                         f->f_flags |= FFLAG_SYNC;
2756                 if (isatty(f->f_file)) {
2757                         if (strcmp(p, ctty) == 0)
2758                                 f->f_type = F_CONSOLE;
2759                         else
2760                                 f->f_type = F_TTY;
2761                         (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1,
2762                             sizeof(f->fu_fname));
2763                 } else {
2764                         (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname));
2765                         f->f_type = F_FILE;
2766                 }
2767                 break;
2768
2769         case '|':
2770                 f->fu_pipe_pid = 0;
2771                 (void)strlcpy(f->fu_pipe_pname, p + 1,
2772                     sizeof(f->fu_pipe_pname));
2773                 f->f_type = F_PIPE;
2774                 break;
2775
2776         case '*':
2777                 f->f_type = F_WALL;
2778                 break;
2779
2780         default:
2781                 for (i = 0; i < MAXUNAMES && *p; i++) {
2782                         for (q = p; *q && *q != ','; )
2783                                 q++;
2784                         (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1);
2785                         if ((q - p) >= MAXLOGNAME)
2786                                 f->fu_uname[i][MAXLOGNAME - 1] = '\0';
2787                         else
2788                                 f->fu_uname[i][q - p] = '\0';
2789                         while (*q == ',' || *q == ' ')
2790                                 q++;
2791                         p = q;
2792                 }
2793                 f->f_type = F_USERS;
2794                 break;
2795         }
2796         return (f);
2797 }
2798
2799
2800 /*
2801  *  Decode a symbolic name to a numeric value
2802  */
2803 static int
2804 decode(const char *name, const CODE *codetab)
2805 {
2806         const CODE *c;
2807         char *p, buf[40];
2808
2809         if (isdigit(*name))
2810                 return (atoi(name));
2811
2812         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2813                 if (isupper(*name))
2814                         *p = tolower(*name);
2815                 else
2816                         *p = *name;
2817         }
2818         *p = '\0';
2819         for (c = codetab; c->c_name; c++)
2820                 if (!strcmp(buf, c->c_name))
2821                         return (c->c_val);
2822
2823         return (-1);
2824 }
2825
2826 static void
2827 markit(void)
2828 {
2829         struct filed *f;
2830         struct deadq_entry *dq, *dq0;
2831
2832         now = time((time_t *)NULL);
2833         MarkSeq += TIMERINTVL;
2834         if (MarkSeq >= MarkInterval) {
2835                 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL,
2836                     "-- MARK --", MARK);
2837                 MarkSeq = 0;
2838         }
2839
2840         STAILQ_FOREACH(f, &fhead, next) {
2841                 if (f->f_prevcount && now >= REPEATTIME(f)) {
2842                         dprintf("flush %s: repeated %d times, %d sec.\n",
2843                             TypeNames[f->f_type], f->f_prevcount,
2844                             repeatinterval[f->f_repeatcount]);
2845                         fprintlog_successive(f, 0);
2846                         BACKOFF(f);
2847                 }
2848         }
2849
2850         /* Walk the dead queue, and see if we should signal somebody. */
2851         TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) {
2852                 switch (dq->dq_timeout) {
2853                 case 0:
2854                         /* Already signalled once, try harder now. */
2855                         if (kill(dq->dq_pid, SIGKILL) != 0)
2856                                 (void)deadq_remove(dq);
2857                         break;
2858
2859                 case 1:
2860                         /*
2861                          * Timed out on dead queue, send terminate
2862                          * signal.  Note that we leave the removal
2863                          * from the dead queue to reapchild(), which
2864                          * will also log the event (unless the process
2865                          * didn't even really exist, in case we simply
2866                          * drop it from the dead queue).
2867                          */
2868                         if (kill(dq->dq_pid, SIGTERM) != 0)
2869                                 (void)deadq_remove(dq);
2870                         else
2871                                 dq->dq_timeout--;
2872                         break;
2873                 default:
2874                         dq->dq_timeout--;
2875                 }
2876         }
2877         MarkSet = 0;
2878         (void)alarm(TIMERINTVL);
2879 }
2880
2881 /*
2882  * fork off and become a daemon, but wait for the child to come online
2883  * before returning to the parent, or we get disk thrashing at boot etc.
2884  * Set a timer so we don't hang forever if it wedges.
2885  */
2886 static int
2887 waitdaemon(int maxwait)
2888 {
2889         int fd;
2890         int status;
2891         pid_t pid, childpid;
2892
2893         switch (childpid = fork()) {
2894         case -1:
2895                 return (-1);
2896         case 0:
2897                 break;
2898         default:
2899                 signal(SIGALRM, timedout);
2900                 alarm(maxwait);
2901                 while ((pid = wait3(&status, 0, NULL)) != -1) {
2902                         if (WIFEXITED(status))
2903                                 errx(1, "child pid %d exited with return code %d",
2904                                         pid, WEXITSTATUS(status));
2905                         if (WIFSIGNALED(status))
2906                                 errx(1, "child pid %d exited on signal %d%s",
2907                                         pid, WTERMSIG(status),
2908                                         WCOREDUMP(status) ? " (core dumped)" :
2909                                         "");
2910                         if (pid == childpid)    /* it's gone... */
2911                                 break;
2912                 }
2913                 exit(0);
2914         }
2915
2916         if (setsid() == -1)
2917                 return (-1);
2918
2919         (void)chdir("/");
2920         if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2921                 (void)dup2(fd, STDIN_FILENO);
2922                 (void)dup2(fd, STDOUT_FILENO);
2923                 (void)dup2(fd, STDERR_FILENO);
2924                 if (fd > STDERR_FILENO)
2925                         (void)close(fd);
2926         }
2927         return (getppid());
2928 }
2929
2930 /*
2931  * We get a SIGALRM from the child when it's running and finished doing it's
2932  * fsync()'s or O_SYNC writes for all the boot messages.
2933  *
2934  * We also get a signal from the kernel if the timer expires, so check to
2935  * see what happened.
2936  */
2937 static void
2938 timedout(int sig __unused)
2939 {
2940         int left;
2941         left = alarm(0);
2942         signal(SIGALRM, SIG_DFL);
2943         if (left == 0)
2944                 errx(1, "timed out waiting for child");
2945         else
2946                 _exit(0);
2947 }
2948
2949 /*
2950  * Add `s' to the list of allowable peer addresses to accept messages
2951  * from.
2952  *
2953  * `s' is a string in the form:
2954  *
2955  *    [*]domainname[:{servicename|portnumber|*}]
2956  *
2957  * or
2958  *
2959  *    netaddr/maskbits[:{servicename|portnumber|*}]
2960  *
2961  * Returns -1 on error, 0 if the argument was valid.
2962  */
2963 static int
2964 #if defined(INET) || defined(INET6)
2965 allowaddr(char *s)
2966 #else
2967 allowaddr(char *s __unused)
2968 #endif
2969 {
2970 #if defined(INET) || defined(INET6)
2971         char *cp1, *cp2;
2972         struct allowedpeer *ap;
2973         struct servent *se;
2974         int masklen = -1;
2975         struct addrinfo hints, *res = NULL;
2976 #ifdef INET
2977         in_addr_t *addrp, *maskp;
2978 #endif
2979 #ifdef INET6
2980         uint32_t *addr6p, *mask6p;
2981 #endif
2982         char ip[NI_MAXHOST];
2983
2984         ap = calloc(1, sizeof(*ap));
2985         if (ap == NULL)
2986                 err(1, "malloc failed");
2987
2988 #ifdef INET6
2989         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2990 #endif
2991                 cp1 = s;
2992         if ((cp1 = strrchr(cp1, ':'))) {
2993                 /* service/port provided */
2994                 *cp1++ = '\0';
2995                 if (strlen(cp1) == 1 && *cp1 == '*')
2996                         /* any port allowed */
2997                         ap->port = 0;
2998                 else if ((se = getservbyname(cp1, "udp"))) {
2999                         ap->port = ntohs(se->s_port);
3000                 } else {
3001                         ap->port = strtol(cp1, &cp2, 0);
3002                         /* port not numeric */
3003                         if (*cp2 != '\0')
3004                                 goto err;
3005                 }
3006         } else {
3007                 if ((se = getservbyname("syslog", "udp")))
3008                         ap->port = ntohs(se->s_port);
3009                 else
3010                         /* sanity, should not happen */
3011                         ap->port = 514;
3012         }
3013
3014         if ((cp1 = strchr(s, '/')) != NULL &&
3015             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
3016                 *cp1 = '\0';
3017                 if ((masklen = atoi(cp1 + 1)) < 0)
3018                         goto err;
3019         }
3020 #ifdef INET6
3021         if (*s == '[') {
3022                 cp2 = s + strlen(s) - 1;
3023                 if (*cp2 == ']') {
3024                         ++s;
3025                         *cp2 = '\0';
3026                 } else {
3027                         cp2 = NULL;
3028                 }
3029         } else {
3030                 cp2 = NULL;
3031         }
3032 #endif
3033         hints = (struct addrinfo){
3034                 .ai_family = PF_UNSPEC,
3035                 .ai_socktype = SOCK_DGRAM,
3036                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3037         };
3038         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
3039                 ap->isnumeric = 1;
3040                 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen);
3041                 ap->a_mask = (struct sockaddr_storage){
3042                         .ss_family = res->ai_family,
3043                         .ss_len = res->ai_addrlen
3044                 };
3045                 switch (res->ai_family) {
3046 #ifdef INET
3047                 case AF_INET:
3048                         maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr;
3049                         addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr;
3050                         if (masklen < 0) {
3051                                 /* use default netmask */
3052                                 if (IN_CLASSA(ntohl(*addrp)))
3053                                         *maskp = htonl(IN_CLASSA_NET);
3054                                 else if (IN_CLASSB(ntohl(*addrp)))
3055                                         *maskp = htonl(IN_CLASSB_NET);
3056                                 else
3057                                         *maskp = htonl(IN_CLASSC_NET);
3058                         } else if (masklen == 0) {
3059                                 *maskp = 0;
3060                         } else if (masklen <= 32) {
3061                                 /* convert masklen to netmask */
3062                                 *maskp = htonl(~((1 << (32 - masklen)) - 1));
3063                         } else {
3064                                 goto err;
3065                         }
3066                         /* Lose any host bits in the network number. */
3067                         *addrp &= *maskp;
3068                         break;
3069 #endif
3070 #ifdef INET6
3071                 case AF_INET6:
3072                         if (masklen > 128)
3073                                 goto err;
3074
3075                         if (masklen < 0)
3076                                 masklen = 128;
3077                         mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
3078                         addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0];
3079                         /* convert masklen to netmask */
3080                         while (masklen > 0) {
3081                                 if (masklen < 32) {
3082                                         *mask6p =
3083                                             htonl(~(0xffffffff >> masklen));
3084                                         *addr6p &= *mask6p;
3085                                         break;
3086                                 } else {
3087                                         *mask6p++ = 0xffffffff;
3088                                         addr6p++;
3089                                         masklen -= 32;
3090                                 }
3091                         }
3092                         break;
3093 #endif
3094                 default:
3095                         goto err;
3096                 }
3097                 freeaddrinfo(res);
3098         } else {
3099                 /* arg `s' is domain name */
3100                 ap->isnumeric = 0;
3101                 ap->a_name = s;
3102                 if (cp1)
3103                         *cp1 = '/';
3104 #ifdef INET6
3105                 if (cp2) {
3106                         *cp2 = ']';
3107                         --s;
3108                 }
3109 #endif
3110         }
3111         STAILQ_INSERT_TAIL(&aphead, ap, next);
3112
3113         if (Debug) {
3114                 printf("allowaddr: rule ");
3115                 if (ap->isnumeric) {
3116                         printf("numeric, ");
3117                         getnameinfo(sstosa(&ap->a_addr),
3118                                     (sstosa(&ap->a_addr))->sa_len,
3119                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3120                         printf("addr = %s, ", ip);
3121                         getnameinfo(sstosa(&ap->a_mask),
3122                                     (sstosa(&ap->a_mask))->sa_len,
3123                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3124                         printf("mask = %s; ", ip);
3125                 } else {
3126                         printf("domainname = %s; ", ap->a_name);
3127                 }
3128                 printf("port = %d\n", ap->port);
3129         }
3130
3131         return (0);
3132 err:
3133         if (res != NULL)
3134                 freeaddrinfo(res);
3135         free(ap);
3136 #endif
3137         return (-1);
3138 }
3139
3140 /*
3141  * Validate that the remote peer has permission to log to us.
3142  */
3143 static int
3144 validate(struct sockaddr *sa, const char *hname)
3145 {
3146         int i;
3147         char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
3148         struct allowedpeer *ap;
3149 #ifdef INET
3150         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
3151 #endif
3152 #ifdef INET6
3153         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
3154 #endif
3155         struct addrinfo hints, *res;
3156         u_short sport;
3157         int num = 0;
3158
3159         STAILQ_FOREACH(ap, &aphead, next) {
3160                 num++;
3161         }
3162         dprintf("# of validation rule: %d\n", num);
3163         if (num == 0)
3164                 /* traditional behaviour, allow everything */
3165                 return (1);
3166
3167         (void)strlcpy(name, hname, sizeof(name));
3168         hints = (struct addrinfo){
3169                 .ai_family = PF_UNSPEC,
3170                 .ai_socktype = SOCK_DGRAM,
3171                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3172         };
3173         if (getaddrinfo(name, NULL, &hints, &res) == 0)
3174                 freeaddrinfo(res);
3175         else if (strchr(name, '.') == NULL) {
3176                 strlcat(name, ".", sizeof name);
3177                 strlcat(name, LocalDomain, sizeof name);
3178         }
3179         if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port),
3180                         NI_NUMERICHOST | NI_NUMERICSERV) != 0)
3181                 return (0);     /* for safety, should not occur */
3182         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
3183                 ip, port, name);
3184         sport = atoi(port);
3185
3186         /* now, walk down the list */
3187         i = 0;
3188         STAILQ_FOREACH(ap, &aphead, next) {
3189                 i++;
3190                 if (ap->port != 0 && ap->port != sport) {
3191                         dprintf("rejected in rule %d due to port mismatch.\n",
3192                             i);
3193                         continue;
3194                 }
3195
3196                 if (ap->isnumeric) {
3197                         if (ap->a_addr.ss_family != sa->sa_family) {
3198                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
3199                                 continue;
3200                         }
3201 #ifdef INET
3202                         else if (ap->a_addr.ss_family == AF_INET) {
3203                                 sin4 = satosin(sa);
3204                                 a4p = satosin(&ap->a_addr);
3205                                 m4p = satosin(&ap->a_mask);
3206                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
3207                                     != a4p->sin_addr.s_addr) {
3208                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3209                                         continue;
3210                                 }
3211                         }
3212 #endif
3213 #ifdef INET6
3214                         else if (ap->a_addr.ss_family == AF_INET6) {
3215                                 sin6 = satosin6(sa);
3216                                 a6p = satosin6(&ap->a_addr);
3217                                 m6p = satosin6(&ap->a_mask);
3218                                 if (a6p->sin6_scope_id != 0 &&
3219                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
3220                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
3221                                         continue;
3222                                 }
3223                                 if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr,
3224                                     &a6p->sin6_addr, &m6p->sin6_addr)) {
3225                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3226                                         continue;
3227                                 }
3228                         }
3229 #endif
3230                         else
3231                                 continue;
3232                 } else {
3233                         if (fnmatch(ap->a_name, name, FNM_NOESCAPE) ==
3234                             FNM_NOMATCH) {
3235                                 dprintf("rejected in rule %d due to name "
3236                                     "mismatch.\n", i);
3237                                 continue;
3238                         }
3239                 }
3240                 dprintf("accepted in rule %d.\n", i);
3241                 return (1);     /* hooray! */
3242         }
3243         return (0);
3244 }
3245
3246 /*
3247  * Fairly similar to popen(3), but returns an open descriptor, as
3248  * opposed to a FILE *.
3249  */
3250 static int
3251 p_open(const char *prog, pid_t *rpid)
3252 {
3253         int pfd[2], nulldesc;
3254         pid_t pid;
3255         char *argv[4]; /* sh -c cmd NULL */
3256         char errmsg[200];
3257
3258         if (pipe(pfd) == -1)
3259                 return (-1);
3260         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
3261                 /* we are royally screwed anyway */
3262                 return (-1);
3263
3264         switch ((pid = fork())) {
3265         case -1:
3266                 close(nulldesc);
3267                 return (-1);
3268
3269         case 0:
3270                 (void)setsid(); /* Avoid catching SIGHUPs. */
3271                 argv[0] = strdup("sh");
3272                 argv[1] = strdup("-c");
3273                 argv[2] = strdup(prog);
3274                 argv[3] = NULL;
3275                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
3276                         logerror("strdup");
3277                         exit(1);
3278                 }
3279
3280                 alarm(0);
3281
3282                 /* Restore signals marked as SIG_IGN. */
3283                 (void)signal(SIGINT, SIG_DFL);
3284                 (void)signal(SIGQUIT, SIG_DFL);
3285                 (void)signal(SIGPIPE, SIG_DFL);
3286
3287                 dup2(pfd[0], STDIN_FILENO);
3288                 dup2(nulldesc, STDOUT_FILENO);
3289                 dup2(nulldesc, STDERR_FILENO);
3290                 closefrom(STDERR_FILENO + 1);
3291
3292                 (void)execvp(_PATH_BSHELL, argv);
3293                 _exit(255);
3294         }
3295         close(nulldesc);
3296         close(pfd[0]);
3297         /*
3298          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
3299          * supposed to get an EWOULDBLOCK on writev(2), which is
3300          * caught by the logic above anyway, which will in turn close
3301          * the pipe, and fork a new logging subprocess if necessary.
3302          * The stale subprocess will be killed some time later unless
3303          * it terminated itself due to closing its input pipe (so we
3304          * get rid of really dead puppies).
3305          */
3306         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
3307                 /* This is bad. */
3308                 (void)snprintf(errmsg, sizeof errmsg,
3309                                "Warning: cannot change pipe to PID %d to "
3310                                "non-blocking behaviour.",
3311                                (int)pid);
3312                 logerror(errmsg);
3313         }
3314         *rpid = pid;
3315         return (pfd[1]);
3316 }
3317
3318 static void
3319 deadq_enter(pid_t pid, const char *name)
3320 {
3321         struct deadq_entry *dq;
3322         int status;
3323
3324         if (pid == 0)
3325                 return;
3326         /*
3327          * Be paranoid, if we can't signal the process, don't enter it
3328          * into the dead queue (perhaps it's already dead).  If possible,
3329          * we try to fetch and log the child's status.
3330          */
3331         if (kill(pid, 0) != 0) {
3332                 if (waitpid(pid, &status, WNOHANG) > 0)
3333                         log_deadchild(pid, status, name);
3334                 return;
3335         }
3336
3337         dq = malloc(sizeof(*dq));
3338         if (dq == NULL) {
3339                 logerror("malloc");
3340                 exit(1);
3341         }
3342         *dq = (struct deadq_entry){
3343                 .dq_pid = pid,
3344                 .dq_timeout = DQ_TIMO_INIT
3345         };
3346         TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries);
3347 }
3348
3349 static int
3350 deadq_remove(struct deadq_entry *dq)
3351 {
3352         if (dq != NULL) {
3353                 TAILQ_REMOVE(&deadq_head, dq, dq_entries);
3354                 free(dq);
3355                 return (1);
3356         }
3357
3358         return (0);
3359 }
3360
3361 static int
3362 deadq_removebypid(pid_t pid)
3363 {
3364         struct deadq_entry *dq;
3365
3366         TAILQ_FOREACH(dq, &deadq_head, dq_entries) {
3367                 if (dq->dq_pid == pid)
3368                         break;
3369         }
3370         return (deadq_remove(dq));
3371 }
3372
3373 static void
3374 log_deadchild(pid_t pid, int status, const char *name)
3375 {
3376         int code;
3377         char buf[256];
3378         const char *reason;
3379
3380         errno = 0; /* Keep strerror() stuff out of logerror messages. */
3381         if (WIFSIGNALED(status)) {
3382                 reason = "due to signal";
3383                 code = WTERMSIG(status);
3384         } else {
3385                 reason = "with status";
3386                 code = WEXITSTATUS(status);
3387                 if (code == 0)
3388                         return;
3389         }
3390         (void)snprintf(buf, sizeof buf,
3391                        "Logging subprocess %d (%s) exited %s %d.",
3392                        pid, name, reason, code);
3393         logerror(buf);
3394 }
3395
3396 static int
3397 socksetup(struct peer *pe)
3398 {
3399         struct addrinfo hints, *res, *res0;
3400         int error;
3401         char *cp;
3402         int (*sl_recv)(struct socklist *);
3403         /*
3404          * We have to handle this case for backwards compatibility:
3405          * If there are two (or more) colons but no '[' and ']',
3406          * assume this is an inet6 address without a service.
3407          */
3408         if (pe->pe_name != NULL) {
3409 #ifdef INET6
3410                 if (pe->pe_name[0] == '[' &&
3411                     (cp = strchr(pe->pe_name + 1, ']')) != NULL) {
3412                         pe->pe_name = &pe->pe_name[1];
3413                         *cp = '\0';
3414                         if (cp[1] == ':' && cp[2] != '\0')
3415                                 pe->pe_serv = cp + 2;
3416                 } else {
3417 #endif
3418                         cp = strchr(pe->pe_name, ':');
3419                         if (cp != NULL && strchr(cp + 1, ':') == NULL) {
3420                                 *cp = '\0';
3421                                 if (cp[1] != '\0')
3422                                         pe->pe_serv = cp + 1;
3423                                 if (cp == pe->pe_name)
3424                                         pe->pe_name = NULL;
3425                         }
3426 #ifdef INET6
3427                 }
3428 #endif
3429         }
3430         hints = (struct addrinfo){
3431                 .ai_family = AF_UNSPEC,
3432                 .ai_socktype = SOCK_DGRAM,
3433                 .ai_flags = AI_PASSIVE
3434         };
3435         if (pe->pe_name != NULL)
3436                 dprintf("Trying peer: %s\n", pe->pe_name);
3437         if (pe->pe_serv == NULL)
3438                 pe->pe_serv = "syslog";
3439         error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0);
3440         if (error) {
3441                 char *msgbuf;
3442
3443                 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s",
3444                     pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv,
3445                     gai_strerror(error));
3446                 errno = 0;
3447                 if (msgbuf == NULL)
3448                         logerror(gai_strerror(error));
3449                 else
3450                         logerror(msgbuf);
3451                 free(msgbuf);
3452                 die(0);
3453         }
3454         for (res = res0; res != NULL; res = res->ai_next) {
3455                 int s;
3456
3457                 if (res->ai_family != AF_LOCAL &&
3458                     SecureMode > 1) {
3459                         /* Only AF_LOCAL in secure mode. */
3460                         continue;
3461                 }
3462                 if (family != AF_UNSPEC &&
3463                     res->ai_family != AF_LOCAL && res->ai_family != family)
3464                         continue;
3465
3466                 s = socket(res->ai_family, res->ai_socktype,
3467                     res->ai_protocol);
3468                 if (s < 0) {
3469                         logerror("socket");
3470                         error++;
3471                         continue;
3472                 }
3473 #ifdef INET6
3474                 if (res->ai_family == AF_INET6) {
3475                         if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
3476                                &(int){1}, sizeof(int)) < 0) {
3477                                 logerror("setsockopt(IPV6_V6ONLY)");
3478                                 close(s);
3479                                 error++;
3480                                 continue;
3481                         }
3482                 }
3483 #endif
3484                 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
3485                     &(int){1}, sizeof(int)) < 0) {
3486                         logerror("setsockopt(SO_REUSEADDR)");
3487                         close(s);
3488                         error++;
3489                         continue;
3490                 }
3491
3492                 /*
3493                  * Bind INET and UNIX-domain sockets.
3494                  *
3495                  * A UNIX-domain socket is always bound to a pathname
3496                  * regardless of -N flag.
3497                  *
3498                  * For INET sockets, RFC 3164 recommends that client
3499                  * side message should come from the privileged syslogd port.
3500                  *
3501                  * If the system administrator chooses not to obey
3502                  * this, we can skip the bind() step so that the
3503                  * system will choose a port for us.
3504                  */
3505                 if (res->ai_family == AF_LOCAL)
3506                         unlink(pe->pe_name);
3507                 if (res->ai_family == AF_LOCAL ||
3508                     NoBind == 0 || pe->pe_name != NULL) {
3509                         if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
3510                                 logerror("bind");
3511                                 close(s);
3512                                 error++;
3513                                 continue;
3514                         }
3515                         if (res->ai_family == AF_LOCAL ||
3516                             SecureMode == 0)
3517                                 increase_rcvbuf(s);
3518                 }
3519                 if (res->ai_family == AF_LOCAL &&
3520                     chmod(pe->pe_name, pe->pe_mode) < 0) {
3521                         dprintf("chmod %s: %s\n", pe->pe_name,
3522                             strerror(errno));
3523                         close(s);
3524                         error++;
3525                         continue;
3526                 }
3527                 dprintf("new socket fd is %d\n", s);
3528                 if (res->ai_socktype != SOCK_DGRAM) {
3529                         listen(s, 5);
3530                 }
3531                 sl_recv = socklist_recv_sock;
3532 #if defined(INET) || defined(INET6)
3533                 if (SecureMode && (res->ai_family == AF_INET ||
3534                     res->ai_family == AF_INET6)) {
3535                         dprintf("shutdown\n");
3536                         /* Forbid communication in secure mode. */
3537                         if (shutdown(s, SHUT_RD) < 0 &&
3538                             errno != ENOTCONN) {
3539                                 logerror("shutdown");
3540                                 if (!Debug)
3541                                         die(0);
3542                         }
3543                         sl_recv = NULL;
3544                 } else
3545 #endif
3546                         dprintf("listening on socket\n");
3547                 dprintf("sending on socket\n");
3548                 addsock(res, &(struct socklist){
3549                         .sl_socket = s,
3550                         .sl_peer = pe,
3551                         .sl_recv = sl_recv
3552                 });
3553         }
3554         freeaddrinfo(res0);
3555
3556         return(error);
3557 }
3558
3559 static void
3560 increase_rcvbuf(int fd)
3561 {
3562         socklen_t len;
3563
3564         if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len,
3565             &(socklen_t){sizeof(len)}) == 0) {
3566                 if (len < RCVBUF_MINSIZE) {
3567                         len = RCVBUF_MINSIZE;
3568                         setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
3569                 }
3570         }
3571 }