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