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         /*
1176          * Parse the TIMESTAMP provided by the remote side. If none is
1177          * found, assume this is not an RFC 3164 formatted message,
1178          * only containing a TAG and a MSG.
1179          */
1180         timestamp = NULL;
1181         if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) ==
1182             msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') {
1183                 msg += RFC3164_DATELEN + 1;
1184                 if (!RemoteAddDate) {
1185                         struct tm tm_now;
1186                         time_t t_now;
1187                         int year;
1188
1189                         /*
1190                          * As the timestamp does not contain the year
1191                          * number, daylight saving time information, nor
1192                          * a time zone, attempt to infer it. Due to
1193                          * clock skews, the timestamp may even be part
1194                          * of the next year. Use the last year for which
1195                          * the timestamp is at most one week in the
1196                          * future.
1197                          *
1198                          * This loop can only run for at most three
1199                          * iterations before terminating.
1200                          */
1201                         t_now = time(NULL);
1202                         localtime_r(&t_now, &tm_now);
1203                         for (year = tm_now.tm_year + 1;; --year) {
1204                                 assert(year >= tm_now.tm_year - 1);
1205                                 timestamp_remote.tm = tm_parsed;
1206                                 timestamp_remote.tm.tm_year = year;
1207                                 timestamp_remote.tm.tm_isdst = -1;
1208                                 timestamp_remote.usec = 0;
1209                                 if (mktime(&timestamp_remote.tm) <
1210                                     t_now + 7 * 24 * 60 * 60)
1211                                         break;
1212                         }
1213                         timestamp = &timestamp_remote;
1214                 }
1215
1216                 /*
1217                  * A single space character MUST also follow the HOSTNAME field.
1218                  */
1219                 msglen = strlen(msg);
1220                 for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) {
1221                         if (msg[i] == ' ') {
1222                                 if (RemoteHostname) {
1223                                         msg[i] = '\0';
1224                                         from = msg;
1225                                 }
1226                                 msg += i + 1;
1227                                 break;
1228                         }
1229                         /*
1230                          * Support non RFC compliant messages, without hostname.
1231                          */
1232                         if (msg[i] == ':')
1233                                 break;
1234                 }
1235                 if (i == MIN(MAXHOSTNAMELEN, msglen)) {
1236                         dprintf("Invalid HOSTNAME from %s: %s\n", from, msg);
1237                         return;
1238                 }
1239         }
1240
1241         /* Remove the TAG, if present. */
1242         parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid);
1243         parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
1244         logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0);
1245 }
1246
1247 /*
1248  * Takes a raw input line, extracts PRI and determines whether the
1249  * message is formatted according to RFC 3164 or RFC 5424. Continues
1250  * parsing of addition fields in the message according to those
1251  * standards and prints the message on the appropriate log files.
1252  */
1253 static void
1254 parsemsg(const char *from, char *msg)
1255 {
1256         char *q;
1257         long n;
1258         size_t i;
1259         int pri;
1260
1261         /* Parse PRI. */
1262         if (msg[0] != '<' || !isdigit(msg[1])) {
1263                 dprintf("Invalid PRI from %s\n", from);
1264                 return;
1265         }
1266         for (i = 2; i <= 4; i++) {
1267                 if (msg[i] == '>')
1268                         break;
1269                 if (!isdigit(msg[i])) {
1270                         dprintf("Invalid PRI header from %s\n", from);
1271                         return;
1272                 }
1273         }
1274         if (msg[i] != '>') {
1275                 dprintf("Invalid PRI header from %s\n", from);
1276                 return;
1277         }
1278         errno = 0;
1279         n = strtol(msg + 1, &q, 10);
1280         if (errno != 0 || *q != msg[i] || n < 0 || n >= INT_MAX) {
1281                 dprintf("Invalid PRI %ld from %s: %s\n",
1282                     n, from, strerror(errno));
1283                 return;
1284         }
1285         pri = n;
1286         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1287                 pri = DEFUPRI;
1288
1289         /*
1290          * Don't allow users to log kernel messages.
1291          * NOTE: since LOG_KERN == 0 this will also match
1292          *       messages with no facility specified.
1293          */
1294         if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
1295                 pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));
1296
1297         /* Parse VERSION. */
1298         msg += i + 1;
1299         if (msg[0] == '1' && msg[1] == ' ')
1300                 parsemsg_rfc5424(from, pri, msg + 2);
1301         else
1302                 parsemsg_rfc3164(from, pri, msg);
1303 }
1304
1305 /*
1306  * Read /dev/klog while data are available, split into lines.
1307  */
1308 static int
1309 socklist_recv_file(struct socklist *sl)
1310 {
1311         char *p, *q, line[MAXLINE + 1];
1312         int len, i;
1313
1314         len = 0;
1315         for (;;) {
1316                 i = read(sl->sl_socket, line + len, MAXLINE - 1 - len);
1317                 if (i > 0) {
1318                         line[i + len] = '\0';
1319                 } else {
1320                         if (i < 0 && errno != EINTR && errno != EAGAIN) {
1321                                 logerror("klog");
1322                                 close(sl->sl_socket);
1323                                 sl->sl_socket = -1;
1324                         }
1325                         break;
1326                 }
1327
1328                 for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
1329                         *q = '\0';
1330                         printsys(p);
1331                 }
1332                 len = strlen(p);
1333                 if (len >= MAXLINE - 1) {
1334                         printsys(p);
1335                         len = 0;
1336                 }
1337                 if (len > 0)
1338                         memmove(line, p, len + 1);
1339         }
1340         if (len > 0)
1341                 printsys(line);
1342
1343         return (len);
1344 }
1345
1346 /*
1347  * Take a raw input line from /dev/klog, format similar to syslog().
1348  */
1349 static void
1350 printsys(char *msg)
1351 {
1352         char *p, *q;
1353         long n;
1354         int flags, isprintf, pri;
1355
1356         flags = SYNC_FILE;      /* fsync after write */
1357         p = msg;
1358         pri = DEFSPRI;
1359         isprintf = 1;
1360         if (*p == '<') {
1361                 errno = 0;
1362                 n = strtol(p + 1, &q, 10);
1363                 if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
1364                         p = q + 1;
1365                         pri = n;
1366                         isprintf = 0;
1367                 }
1368         }
1369         /*
1370          * Kernel printf's and LOG_CONSOLE messages have been displayed
1371          * on the console already.
1372          */
1373         if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
1374                 flags |= IGN_CONS;
1375         if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
1376                 pri = DEFSPRI;
1377         logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags);
1378 }
1379
1380 static time_t   now;
1381
1382 /*
1383  * Match a program or host name against a specification.
1384  * Return a non-0 value if the message must be ignored
1385  * based on the specification.
1386  */
1387 static int
1388 skip_message(const char *name, const char *spec, int checkcase)
1389 {
1390         const char *s;
1391         char prev, next;
1392         int exclude = 0;
1393         /* Behaviour on explicit match */
1394
1395         if (spec == NULL)
1396                 return 0;
1397         switch (*spec) {
1398         case '-':
1399                 exclude = 1;
1400                 /*FALLTHROUGH*/
1401         case '+':
1402                 spec++;
1403                 break;
1404         default:
1405                 break;
1406         }
1407         if (checkcase)
1408                 s = strstr (spec, name);
1409         else
1410                 s = strcasestr (spec, name);
1411
1412         if (s != NULL) {
1413                 prev = (s == spec ? ',' : *(s - 1));
1414                 next = *(s + strlen (name));
1415
1416                 if (prev == ',' && (next == '\0' || next == ','))
1417                         /* Explicit match: skip iff the spec is an
1418                            exclusive one. */
1419                         return exclude;
1420         }
1421
1422         /* No explicit match for this name: skip the message iff
1423            the spec is an inclusive one. */
1424         return !exclude;
1425 }
1426
1427 /*
1428  * Logs a message to the appropriate log files, users, etc. based on the
1429  * priority. Log messages are always formatted according to RFC 3164,
1430  * even if they were in RFC 5424 format originally, The MSGID and
1431  * STRUCTURED-DATA fields are thus discarded for the time being.
1432  */
1433 static void
1434 logmsg(int pri, const struct logtime *timestamp, const char *hostname,
1435     const char *app_name, const char *procid, const char *msgid,
1436     const char *structured_data, const char *msg, int flags)
1437 {
1438         struct timeval tv;
1439         struct logtime timestamp_now;
1440         struct filed *f;
1441         size_t savedlen;
1442         int fac, prilev;
1443         char saved[MAXSVLINE];
1444
1445         dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
1446             pri, flags, hostname, msg);
1447
1448         (void)gettimeofday(&tv, NULL);
1449         now = tv.tv_sec;
1450         if (timestamp == NULL) {
1451                 localtime_r(&now, &timestamp_now.tm);
1452                 timestamp_now.usec = tv.tv_usec;
1453                 timestamp = &timestamp_now;
1454         }
1455
1456         /* extract facility and priority level */
1457         if (flags & MARK)
1458                 fac = LOG_NFACILITIES;
1459         else
1460                 fac = LOG_FAC(pri);
1461
1462         /* Check maximum facility number. */
1463         if (fac > LOG_NFACILITIES)
1464                 return;
1465
1466         prilev = LOG_PRI(pri);
1467
1468         /* log the message to the particular outputs */
1469         if (!Initialized) {
1470                 f = &consfile;
1471                 /*
1472                  * Open in non-blocking mode to avoid hangs during open
1473                  * and close(waiting for the port to drain).
1474                  */
1475                 f->f_file = open(ctty, O_WRONLY | O_NONBLOCK, 0);
1476
1477                 if (f->f_file >= 0) {
1478                         f->f_lasttime = *timestamp;
1479                         fprintlog_first(f, hostname, app_name, procid, msgid,
1480                             structured_data, msg, flags);
1481                         close(f->f_file);
1482                         f->f_file = -1;
1483                 }
1484                 return;
1485         }
1486
1487         /*
1488          * Store all of the fields of the message, except the timestamp,
1489          * in a single string. This string is used to detect duplicate
1490          * messages.
1491          */
1492         assert(hostname != NULL);
1493         assert(msg != NULL);
1494         savedlen = snprintf(saved, sizeof(saved),
1495             "%d %s %s %s %s %s %s", pri, hostname,
1496             app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid,
1497             msgid == NULL ? "-" : msgid,
1498             structured_data == NULL ? "-" : structured_data, msg);
1499
1500         STAILQ_FOREACH(f, &fhead, next) {
1501                 /* skip messages that are incorrect priority */
1502                 if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
1503                      ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
1504                      ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
1505                      )
1506                     || f->f_pmask[fac] == INTERNAL_NOPRI)
1507                         continue;
1508
1509                 /* skip messages with the incorrect hostname */
1510                 if (skip_message(hostname, f->f_host, 0))
1511                         continue;
1512
1513                 /* skip messages with the incorrect program name */
1514                 if (skip_message(app_name == NULL ? "" : app_name,
1515                     f->f_program, 1))
1516                         continue;
1517
1518                 /* skip message to console if it has already been printed */
1519                 if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
1520                         continue;
1521
1522                 /* don't output marks to recently written files */
1523                 if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
1524                         continue;
1525
1526                 /*
1527                  * suppress duplicate lines to this file
1528                  */
1529                 if (no_compress - (f->f_type != F_PIPE) < 1 &&
1530                     (flags & MARK) == 0 && savedlen == f->f_prevlen &&
1531                     strcmp(saved, f->f_prevline) == 0) {
1532                         f->f_lasttime = *timestamp;
1533                         f->f_prevcount++;
1534                         dprintf("msg repeated %d times, %ld sec of %d\n",
1535                             f->f_prevcount, (long)(now - f->f_time),
1536                             repeatinterval[f->f_repeatcount]);
1537                         /*
1538                          * If domark would have logged this by now,
1539                          * flush it now (so we don't hold isolated messages),
1540                          * but back off so we'll flush less often
1541                          * in the future.
1542                          */
1543                         if (now > REPEATTIME(f)) {
1544                                 fprintlog_successive(f, flags);
1545                                 BACKOFF(f);
1546                         }
1547                 } else {
1548                         /* new line, save it */
1549                         if (f->f_prevcount)
1550                                 fprintlog_successive(f, 0);
1551                         f->f_repeatcount = 0;
1552                         f->f_prevpri = pri;
1553                         f->f_lasttime = *timestamp;
1554                         static_assert(sizeof(f->f_prevline) == sizeof(saved),
1555                             "Space to store saved line incorrect");
1556                         (void)strcpy(f->f_prevline, saved);
1557                         f->f_prevlen = savedlen;
1558                         fprintlog_first(f, hostname, app_name, procid, msgid,
1559                             structured_data, msg, flags);
1560                 }
1561         }
1562 }
1563
1564 static void
1565 dofsync(void)
1566 {
1567         struct filed *f;
1568
1569         STAILQ_FOREACH(f, &fhead, next) {
1570                 if ((f->f_type == F_FILE) &&
1571                     (f->f_flags & FFLAG_NEEDSYNC)) {
1572                         f->f_flags &= ~FFLAG_NEEDSYNC;
1573                         (void)fsync(f->f_file);
1574                 }
1575         }
1576 }
1577
1578 /*
1579  * List of iovecs to which entries can be appended.
1580  * Used for constructing the message to be logged.
1581  */
1582 struct iovlist {
1583         struct iovec    iov[TTYMSG_IOV_MAX];
1584         size_t          iovcnt;
1585         size_t          totalsize;
1586 };
1587
1588 static void
1589 iovlist_init(struct iovlist *il)
1590 {
1591
1592         il->iovcnt = 0;
1593         il->totalsize = 0;
1594 }
1595
1596 static void
1597 iovlist_append(struct iovlist *il, const char *str)
1598 {
1599         size_t size;
1600
1601         /* Discard components if we've run out of iovecs. */
1602         if (il->iovcnt < nitems(il->iov)) {
1603                 size = strlen(str);
1604                 il->iov[il->iovcnt++] = (struct iovec){
1605                         .iov_base       = __DECONST(char *, str),
1606                         .iov_len        = size,
1607                 };
1608                 il->totalsize += size;
1609         }
1610 }
1611
1612 static void
1613 iovlist_truncate(struct iovlist *il, size_t size)
1614 {
1615         struct iovec *last;
1616         size_t diff;
1617
1618         while (il->totalsize > size) {
1619                 diff = il->totalsize - size;
1620                 last = &il->iov[il->iovcnt - 1];
1621                 if (diff >= last->iov_len) {
1622                         /* Remove the last iovec entirely. */
1623                         --il->iovcnt;
1624                         il->totalsize -= last->iov_len;
1625                 } else {
1626                         /* Remove the last iovec partially. */
1627                         last->iov_len -= diff;
1628                         il->totalsize -= diff;
1629                 }
1630         }
1631 }
1632
1633 static void
1634 fprintlog_write(struct filed *f, struct iovlist *il, int flags)
1635 {
1636         struct msghdr msghdr;
1637         struct addrinfo *r;
1638         struct socklist *sl;
1639         const char *msgret;
1640         ssize_t lsent;
1641
1642         switch (f->f_type) {
1643         case F_FORW:
1644                 /* Truncate messages to RFC 5426 recommended size. */
1645                 dprintf(" %s", f->fu_forw_hname);
1646                 switch (f->fu_forw_addr->ai_addr->sa_family) {
1647 #ifdef INET
1648                 case AF_INET:
1649                         dprintf(":%d\n",
1650                             ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port));
1651                         iovlist_truncate(il, 480);
1652                         break;
1653 #endif
1654 #ifdef INET6
1655                 case AF_INET6:
1656                         dprintf(":%d\n",
1657                             ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port));
1658                         iovlist_truncate(il, 1180);
1659                         break;
1660 #endif
1661                 default:
1662                         dprintf("\n");
1663                 }
1664
1665                 lsent = 0;
1666                 for (r = f->fu_forw_addr; r; r = r->ai_next) {
1667                         memset(&msghdr, 0, sizeof(msghdr));
1668                         msghdr.msg_name = r->ai_addr;
1669                         msghdr.msg_namelen = r->ai_addrlen;
1670                         msghdr.msg_iov = il->iov;
1671                         msghdr.msg_iovlen = il->iovcnt;
1672                         STAILQ_FOREACH(sl, &shead, next) {
1673                                 if (sl->sl_ss.ss_family == AF_LOCAL ||
1674                                     sl->sl_ss.ss_family == AF_UNSPEC ||
1675                                     sl->sl_socket < 0)
1676                                         continue;
1677                                 lsent = sendmsg(sl->sl_socket, &msghdr, 0);
1678                                 if (lsent == (ssize_t)il->totalsize)
1679                                         break;
1680                         }
1681                         if (lsent == (ssize_t)il->totalsize && !send_to_all)
1682                                 break;
1683                 }
1684                 dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize);
1685                 if (lsent != (ssize_t)il->totalsize) {
1686                         int e = errno;
1687                         logerror("sendto");
1688                         errno = e;
1689                         switch (errno) {
1690                         case ENOBUFS:
1691                         case ENETDOWN:
1692                         case ENETUNREACH:
1693                         case EHOSTUNREACH:
1694                         case EHOSTDOWN:
1695                         case EADDRNOTAVAIL:
1696                                 break;
1697                         /* case EBADF: */
1698                         /* case EACCES: */
1699                         /* case ENOTSOCK: */
1700                         /* case EFAULT: */
1701                         /* case EMSGSIZE: */
1702                         /* case EAGAIN: */
1703                         /* case ENOBUFS: */
1704                         /* case ECONNREFUSED: */
1705                         default:
1706                                 dprintf("removing entry: errno=%d\n", e);
1707                                 f->f_type = F_UNUSED;
1708                                 break;
1709                         }
1710                 }
1711                 break;
1712
1713         case F_FILE:
1714                 dprintf(" %s\n", f->fu_fname);
1715                 iovlist_append(il, "\n");
1716                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1717                         /*
1718                          * If writev(2) fails for potentially transient errors
1719                          * like the filesystem being full, ignore it.
1720                          * Otherwise remove this logfile from the list.
1721                          */
1722                         if (errno != ENOSPC) {
1723                                 int e = errno;
1724                                 close_filed(f);
1725                                 errno = e;
1726                                 logerror(f->fu_fname);
1727                         }
1728                 } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
1729                         f->f_flags |= FFLAG_NEEDSYNC;
1730                         needdofsync = 1;
1731                 }
1732                 break;
1733
1734         case F_PIPE:
1735                 dprintf(" %s\n", f->fu_pipe_pname);
1736                 iovlist_append(il, "\n");
1737                 if (f->fu_pipe_pid == 0) {
1738                         if ((f->f_file = p_open(f->fu_pipe_pname,
1739                                                 &f->fu_pipe_pid)) < 0) {
1740                                 logerror(f->fu_pipe_pname);
1741                                 break;
1742                         }
1743                 }
1744                 if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
1745                         int e = errno;
1746
1747                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
1748                         close_filed(f);
1749                         errno = e;
1750                         logerror(f->fu_pipe_pname);
1751                 }
1752                 break;
1753
1754         case F_CONSOLE:
1755                 if (flags & IGN_CONS) {
1756                         dprintf(" (ignored)\n");
1757                         break;
1758                 }
1759                 /* FALLTHROUGH */
1760
1761         case F_TTY:
1762                 dprintf(" %s%s\n", _PATH_DEV, f->fu_fname);
1763                 iovlist_append(il, "\r\n");
1764                 errno = 0;      /* ttymsg() only sometimes returns an errno */
1765                 if ((msgret = ttymsg(il->iov, il->iovcnt, f->fu_fname, 10))) {
1766                         f->f_type = F_UNUSED;
1767                         logerror(msgret);
1768                 }
1769                 break;
1770
1771         case F_USERS:
1772         case F_WALL:
1773                 dprintf("\n");
1774                 iovlist_append(il, "\r\n");
1775                 wallmsg(f, il->iov, il->iovcnt);
1776                 break;
1777         }
1778 }
1779
1780 static void
1781 fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name,
1782     const char *procid, const char *msgid, const char *structured_data,
1783     const char *msg, int flags)
1784 {
1785         struct iovlist il;
1786         suseconds_t usec;
1787         int i;
1788         char timebuf[33], priority_number[5];
1789
1790         iovlist_init(&il);
1791         if (f->f_type == F_WALL)
1792                 iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n");
1793         iovlist_append(&il, "<");
1794         snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri);
1795         iovlist_append(&il, priority_number);
1796         iovlist_append(&il, ">1 ");
1797         if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z",
1798             &f->f_lasttime.tm) == sizeof(timebuf) - 2) {
1799                 /* Add colon to the time zone offset, which %z doesn't do. */
1800                 timebuf[32] = '\0';
1801                 timebuf[31] = timebuf[30];
1802                 timebuf[30] = timebuf[29];
1803                 timebuf[29] = ':';
1804
1805                 /* Overwrite space for microseconds with actual value. */
1806                 usec = f->f_lasttime.usec;
1807                 for (i = 25; i >= 20; --i) {
1808                         timebuf[i] = usec % 10 + '0';
1809                         usec /= 10;
1810                 }
1811                 iovlist_append(&il, timebuf);
1812         } else
1813                 iovlist_append(&il, "-");
1814         iovlist_append(&il, " ");
1815         iovlist_append(&il, hostname);
1816         iovlist_append(&il, " ");
1817         iovlist_append(&il, app_name == NULL ? "-" : app_name);
1818         iovlist_append(&il, " ");
1819         iovlist_append(&il, procid == NULL ? "-" : procid);
1820         iovlist_append(&il, " ");
1821         iovlist_append(&il, msgid == NULL ? "-" : msgid);
1822         iovlist_append(&il, " ");
1823         iovlist_append(&il, structured_data == NULL ? "-" : structured_data);
1824         iovlist_append(&il, " ");
1825         iovlist_append(&il, msg);
1826
1827         fprintlog_write(f, &il, flags);
1828 }
1829
1830 static void
1831 fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name,
1832     const char *procid, const char *msg, int flags)
1833 {
1834         struct iovlist il;
1835         const CODE *c;
1836         int facility, priority;
1837         char timebuf[RFC3164_DATELEN + 1], facility_number[5],
1838             priority_number[5];
1839         bool facility_found, priority_found;
1840
1841         if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT,
1842             &f->f_lasttime.tm) == 0)
1843                 timebuf[0] = '\0';
1844
1845         iovlist_init(&il);
1846         switch (f->f_type) {
1847         case F_FORW:
1848                 /* Message forwarded over the network. */
1849                 iovlist_append(&il, "<");
1850                 snprintf(priority_number, sizeof(priority_number), "%d",
1851                     f->f_prevpri);
1852                 iovlist_append(&il, priority_number);
1853                 iovlist_append(&il, ">");
1854                 iovlist_append(&il, timebuf);
1855                 if (strcasecmp(hostname, LocalHostName) != 0) {
1856                         iovlist_append(&il, " Forwarded from ");
1857                         iovlist_append(&il, hostname);
1858                         iovlist_append(&il, ":");
1859                 }
1860                 iovlist_append(&il, " ");
1861                 break;
1862
1863         case F_WALL:
1864                 /* Message written to terminals. */
1865                 iovlist_append(&il, "\r\n\aMessage from syslogd@");
1866                 iovlist_append(&il, hostname);
1867                 iovlist_append(&il, " at ");
1868                 iovlist_append(&il, timebuf);
1869                 iovlist_append(&il, " ...\r\n");
1870                 break;
1871
1872         default:
1873                 /* Message written to files. */
1874                 iovlist_append(&il, timebuf);
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
1920                 iovlist_append(&il, hostname);
1921                 iovlist_append(&il, " ");
1922                 break;
1923         }
1924
1925         /* Message body with application name and process ID prefixed. */
1926         if (app_name != NULL) {
1927                 iovlist_append(&il, app_name);
1928                 if (procid != NULL) {
1929                         iovlist_append(&il, "[");
1930                         iovlist_append(&il, procid);
1931                         iovlist_append(&il, "]");
1932                 }
1933                 iovlist_append(&il, ": ");
1934         }
1935         iovlist_append(&il, msg);
1936
1937         fprintlog_write(f, &il, flags);
1938 }
1939
1940 static void
1941 fprintlog_first(struct filed *f, const char *hostname, const char *app_name,
1942     const char *procid, const char *msgid __unused,
1943     const char *structured_data __unused, const char *msg, int flags)
1944 {
1945
1946         dprintf("Logging to %s", TypeNames[f->f_type]);
1947         f->f_time = now;
1948         f->f_prevcount = 0;
1949         if (f->f_type == F_UNUSED) {
1950                 dprintf("\n");
1951                 return;
1952         }
1953
1954         if (RFC3164OutputFormat)
1955                 fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags);
1956         else
1957                 fprintlog_rfc5424(f, hostname, app_name, procid, msgid,
1958                     structured_data, msg, flags);
1959 }
1960
1961 /*
1962  * Prints a message to a log file that the previously logged message was
1963  * received multiple times.
1964  */
1965 static void
1966 fprintlog_successive(struct filed *f, int flags)
1967 {
1968         char msg[100];
1969
1970         assert(f->f_prevcount > 0);
1971         snprintf(msg, sizeof(msg), "last message repeated %d times",
1972             f->f_prevcount);
1973         fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg,
1974             flags);
1975 }
1976
1977 /*
1978  *  WALLMSG -- Write a message to the world at large
1979  *
1980  *      Write the specified message to either the entire
1981  *      world, or a list of approved users.
1982  */
1983 static void
1984 wallmsg(struct filed *f, struct iovec *iov, const int iovlen)
1985 {
1986         static int reenter;                     /* avoid calling ourselves */
1987         struct utmpx *ut;
1988         int i;
1989         const char *p;
1990
1991         if (reenter++)
1992                 return;
1993         setutxent();
1994         /* NOSTRICT */
1995         while ((ut = getutxent()) != NULL) {
1996                 if (ut->ut_type != USER_PROCESS)
1997                         continue;
1998                 if (f->f_type == F_WALL) {
1999                         if ((p = ttymsg(iov, iovlen, ut->ut_line,
2000                             TTYMSGTIME)) != NULL) {
2001                                 errno = 0;      /* already in msg */
2002                                 logerror(p);
2003                         }
2004                         continue;
2005                 }
2006                 /* should we send the message to this user? */
2007                 for (i = 0; i < MAXUNAMES; i++) {
2008                         if (!f->fu_uname[i][0])
2009                                 break;
2010                         if (!strcmp(f->fu_uname[i], ut->ut_user)) {
2011                                 if ((p = ttymsg_check(iov, iovlen, ut->ut_line,
2012                                     TTYMSGTIME)) != NULL) {
2013                                         errno = 0;      /* already in msg */
2014                                         logerror(p);
2015                                 }
2016                                 break;
2017                         }
2018                 }
2019         }
2020         endutxent();
2021         reenter = 0;
2022 }
2023
2024 /*
2025  * Wrapper routine for ttymsg() that checks the terminal for messages enabled.
2026  */
2027 static const char *
2028 ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout)
2029 {
2030         static char device[1024];
2031         static char errbuf[1024];
2032         struct stat sb;
2033
2034         (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);
2035
2036         if (stat(device, &sb) < 0) {
2037                 (void) snprintf(errbuf, sizeof(errbuf),
2038                     "%s: %s", device, strerror(errno));
2039                 return (errbuf);
2040         }
2041         if ((sb.st_mode & S_IWGRP) == 0)
2042                 /* Messages disabled. */
2043                 return (NULL);
2044         return ttymsg(iov, iovcnt, line, tmout);
2045 }
2046
2047 static void
2048 reapchild(int signo __unused)
2049 {
2050         int status;
2051         pid_t pid;
2052         struct filed *f;
2053
2054         while ((pid = wait3(&status, WNOHANG, (struct rusage *)NULL)) > 0) {
2055                 /* First, look if it's a process from the dead queue. */
2056                 if (deadq_removebypid(pid))
2057                         continue;
2058
2059                 /* Now, look in list of active processes. */
2060                 STAILQ_FOREACH(f, &fhead, next) {
2061                         if (f->f_type == F_PIPE &&
2062                             f->fu_pipe_pid == pid) {
2063                                 close_filed(f);
2064                                 log_deadchild(pid, status, f->fu_pipe_pname);
2065                                 break;
2066                         }
2067                 }
2068         }
2069         WantReapchild = 0;
2070 }
2071
2072 /*
2073  * Return a printable representation of a host address.
2074  */
2075 static const char *
2076 cvthname(struct sockaddr *f)
2077 {
2078         int error, hl;
2079         static char hname[NI_MAXHOST], ip[NI_MAXHOST];
2080
2081         dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len);
2082         error = getnameinfo(f, f->sa_len, ip, sizeof(ip), NULL, 0,
2083                     NI_NUMERICHOST);
2084         if (error) {
2085                 dprintf("Malformed from address %s\n", gai_strerror(error));
2086                 return ("???");
2087         }
2088         dprintf("cvthname(%s)\n", ip);
2089
2090         if (!resolve)
2091                 return (ip);
2092
2093         error = getnameinfo(f, f->sa_len, hname, sizeof(hname),
2094                     NULL, 0, NI_NAMEREQD);
2095         if (error) {
2096                 dprintf("Host name for your address (%s) unknown\n", ip);
2097                 return (ip);
2098         }
2099         hl = strlen(hname);
2100         if (hl > 0 && hname[hl-1] == '.')
2101                 hname[--hl] = '\0';
2102         trimdomain(hname, hl);
2103         return (hname);
2104 }
2105
2106 static void
2107 dodie(int signo)
2108 {
2109
2110         WantDie = signo;
2111 }
2112
2113 static void
2114 domark(int signo __unused)
2115 {
2116
2117         MarkSet = 1;
2118 }
2119
2120 /*
2121  * Print syslogd errors some place.
2122  */
2123 static void
2124 logerror(const char *msg)
2125 {
2126         char buf[512];
2127         static int recursed = 0;
2128
2129         /* If there's an error while trying to log an error, give up. */
2130         if (recursed)
2131                 return;
2132         recursed++;
2133         if (errno != 0) {
2134                 (void)snprintf(buf, sizeof(buf), "%s: %s", msg,
2135                     strerror(errno));
2136                 msg = buf;
2137         }
2138         errno = 0;
2139         dprintf("%s\n", buf);
2140         logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL,
2141             NULL, msg, 0);
2142         recursed--;
2143 }
2144
2145 static void
2146 die(int signo)
2147 {
2148         struct filed *f;
2149         struct socklist *sl;
2150         char buf[100];
2151
2152         STAILQ_FOREACH(f, &fhead, next) {
2153                 /* flush any pending output */
2154                 if (f->f_prevcount)
2155                         fprintlog_successive(f, 0);
2156                 if (f->f_type == F_PIPE && f->fu_pipe_pid > 0)
2157                         close_filed(f);
2158         }
2159         if (signo) {
2160                 dprintf("syslogd: exiting on signal %d\n", signo);
2161                 (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
2162                 errno = 0;
2163                 logerror(buf);
2164         }
2165         STAILQ_FOREACH(sl, &shead, next) {
2166                 if (sl->sl_ss.ss_family == AF_LOCAL)
2167                         unlink(sl->sl_peer->pe_name);
2168         }
2169         pidfile_remove(pfh);
2170
2171         exit(1);
2172 }
2173
2174 static int
2175 configfiles(const struct dirent *dp)
2176 {
2177         const char *p;
2178         size_t ext_len;
2179
2180         if (dp->d_name[0] == '.')
2181                 return (0);
2182
2183         ext_len = sizeof(include_ext) -1;
2184
2185         if (dp->d_namlen <= ext_len)
2186                 return (0);
2187
2188         p = &dp->d_name[dp->d_namlen - ext_len];
2189         if (strcmp(p, include_ext) != 0)
2190                 return (0);
2191
2192         return (1);
2193 }
2194
2195 static void
2196 readconfigfile(FILE *cf, int allow_includes)
2197 {
2198         FILE *cf2;
2199         struct filed *f;
2200         struct dirent **ent;
2201         char cline[LINE_MAX];
2202         char host[MAXHOSTNAMELEN];
2203         char prog[LINE_MAX];
2204         char file[MAXPATHLEN];
2205         char *p, *tmp;
2206         int i, nents;
2207         size_t include_len;
2208
2209         /*
2210          *  Foreach line in the conf table, open that file.
2211          */
2212         include_len = sizeof(include_str) -1;
2213         (void)strlcpy(host, "*", sizeof(host));
2214         (void)strlcpy(prog, "*", sizeof(prog));
2215         while (fgets(cline, sizeof(cline), cf) != NULL) {
2216                 /*
2217                  * check for end-of-section, comments, strip off trailing
2218                  * spaces and newline character. #!prog is treated specially:
2219                  * following lines apply only to that program.
2220                  */
2221                 for (p = cline; isspace(*p); ++p)
2222                         continue;
2223                 if (*p == 0)
2224                         continue;
2225                 if (allow_includes &&
2226                     strncmp(p, include_str, include_len) == 0 &&
2227                     isspace(p[include_len])) {
2228                         p += include_len;
2229                         while (isspace(*p))
2230                                 p++;
2231                         tmp = p;
2232                         while (*tmp != '\0' && !isspace(*tmp))
2233                                 tmp++;
2234                         *tmp = '\0';
2235                         dprintf("Trying to include files in '%s'\n", p);
2236                         nents = scandir(p, &ent, configfiles, alphasort);
2237                         if (nents == -1) {
2238                                 dprintf("Unable to open '%s': %s\n", p,
2239                                     strerror(errno));
2240                                 continue;
2241                         }
2242                         for (i = 0; i < nents; i++) {
2243                                 if (snprintf(file, sizeof(file), "%s/%s", p,
2244                                     ent[i]->d_name) >= (int)sizeof(file)) {
2245                                         dprintf("ignoring path too long: "
2246                                             "'%s/%s'\n", p, ent[i]->d_name);
2247                                         free(ent[i]);
2248                                         continue;
2249                                 }
2250                                 free(ent[i]);
2251                                 cf2 = fopen(file, "r");
2252                                 if (cf2 == NULL)
2253                                         continue;
2254                                 dprintf("reading %s\n", file);
2255                                 readconfigfile(cf2, 0);
2256                                 fclose(cf2);
2257                         }
2258                         free(ent);
2259                         continue;
2260                 }
2261                 if (*p == '#') {
2262                         p++;
2263                         if (*p != '!' && *p != '+' && *p != '-')
2264                                 continue;
2265                 }
2266                 if (*p == '+' || *p == '-') {
2267                         host[0] = *p++;
2268                         while (isspace(*p))
2269                                 p++;
2270                         if ((!*p) || (*p == '*')) {
2271                                 (void)strlcpy(host, "*", sizeof(host));
2272                                 continue;
2273                         }
2274                         if (*p == '@')
2275                                 p = LocalHostName;
2276                         for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
2277                                 if (!isalnum(*p) && *p != '.' && *p != '-'
2278                                     && *p != ',' && *p != ':' && *p != '%')
2279                                         break;
2280                                 host[i] = *p++;
2281                         }
2282                         host[i] = '\0';
2283                         continue;
2284                 }
2285                 if (*p == '!') {
2286                         p++;
2287                         while (isspace(*p)) p++;
2288                         if ((!*p) || (*p == '*')) {
2289                                 (void)strlcpy(prog, "*", sizeof(prog));
2290                                 continue;
2291                         }
2292                         for (i = 0; i < LINE_MAX - 1; i++) {
2293                                 if (!isprint(p[i]) || isspace(p[i]))
2294                                         break;
2295                                 prog[i] = p[i];
2296                         }
2297                         prog[i] = 0;
2298                         continue;
2299                 }
2300                 for (p = cline + 1; *p != '\0'; p++) {
2301                         if (*p != '#')
2302                                 continue;
2303                         if (*(p - 1) == '\\') {
2304                                 strcpy(p - 1, p);
2305                                 p--;
2306                                 continue;
2307                         }
2308                         *p = '\0';
2309                         break;
2310                 }
2311                 for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
2312                         cline[i] = '\0';
2313                 f = cfline(cline, prog, host);
2314                 if (f != NULL)
2315                         addfile(f);
2316                 free(f);
2317         }
2318 }
2319
2320 static void
2321 sighandler(int signo)
2322 {
2323
2324         /* Send an wake-up signal to the select() loop. */
2325         write(sigpipe[1], &signo, sizeof(signo));
2326 }
2327
2328 /*
2329  *  INIT -- Initialize syslogd from configuration table
2330  */
2331 static void
2332 init(int signo)
2333 {
2334         int i;
2335         FILE *cf;
2336         struct filed *f;
2337         char *p;
2338         char oldLocalHostName[MAXHOSTNAMELEN];
2339         char hostMsg[2*MAXHOSTNAMELEN+40];
2340         char bootfileMsg[LINE_MAX];
2341
2342         dprintf("init\n");
2343         WantInitialize = 0;
2344
2345         /*
2346          * Load hostname (may have changed).
2347          */
2348         if (signo != 0)
2349                 (void)strlcpy(oldLocalHostName, LocalHostName,
2350                     sizeof(oldLocalHostName));
2351         if (gethostname(LocalHostName, sizeof(LocalHostName)))
2352                 err(EX_OSERR, "gethostname() failed");
2353         if ((p = strchr(LocalHostName, '.')) != NULL) {
2354                 /* RFC 5424 prefers logging FQDNs. */
2355                 if (RFC3164OutputFormat)
2356                         *p = '\0';
2357                 LocalDomain = p + 1;
2358         } else {
2359                 LocalDomain = "";
2360         }
2361
2362         /*
2363          * Load / reload timezone data (in case it changed).
2364          *
2365          * Just calling tzset() again does not work, the timezone code
2366          * caches the result.  However, by setting the TZ variable, one
2367          * can defeat the caching and have the timezone code really
2368          * reload the timezone data.  Respect any initial setting of
2369          * TZ, in case the system is configured specially.
2370          */
2371         dprintf("loading timezone data via tzset()\n");
2372         if (getenv("TZ")) {
2373                 tzset();
2374         } else {
2375                 setenv("TZ", ":/etc/localtime", 1);
2376                 tzset();
2377                 unsetenv("TZ");
2378         }
2379
2380         /*
2381          *  Close all open log files.
2382          */
2383         Initialized = 0;
2384         STAILQ_FOREACH(f, &fhead, next) {
2385                 /* flush any pending output */
2386                 if (f->f_prevcount)
2387                         fprintlog_successive(f, 0);
2388
2389                 switch (f->f_type) {
2390                 case F_FILE:
2391                 case F_FORW:
2392                 case F_CONSOLE:
2393                 case F_TTY:
2394                         close_filed(f);
2395                         break;
2396                 case F_PIPE:
2397                         deadq_enter(f->fu_pipe_pid, f->fu_pipe_pname);
2398                         close_filed(f);
2399                         break;
2400                 }
2401         }
2402         while(!STAILQ_EMPTY(&fhead)) {
2403                 f = STAILQ_FIRST(&fhead);
2404                 STAILQ_REMOVE_HEAD(&fhead, next);
2405                 free(f->f_program);
2406                 free(f->f_host);
2407                 free(f);
2408         }
2409
2410         /* open the configuration file */
2411         if ((cf = fopen(ConfFile, "r")) == NULL) {
2412                 dprintf("cannot open %s\n", ConfFile);
2413                 f = cfline("*.ERR\t/dev/console", "*", "*");
2414                 if (f != NULL)
2415                         addfile(f);
2416                 free(f);
2417                 f = cfline("*.PANIC\t*", "*", "*");
2418                 if (f != NULL)
2419                         addfile(f);
2420                 free(f);
2421                 Initialized = 1;
2422
2423                 return;
2424         }
2425
2426         readconfigfile(cf, 1);
2427
2428         /* close the configuration file */
2429         (void)fclose(cf);
2430
2431         Initialized = 1;
2432
2433         if (Debug) {
2434                 int port;
2435                 STAILQ_FOREACH(f, &fhead, next) {
2436                         for (i = 0; i <= LOG_NFACILITIES; i++)
2437                                 if (f->f_pmask[i] == INTERNAL_NOPRI)
2438                                         printf("X ");
2439                                 else
2440                                         printf("%d ", f->f_pmask[i]);
2441                         printf("%s: ", TypeNames[f->f_type]);
2442                         switch (f->f_type) {
2443                         case F_FILE:
2444                                 printf("%s", f->fu_fname);
2445                                 break;
2446
2447                         case F_CONSOLE:
2448                         case F_TTY:
2449                                 printf("%s%s", _PATH_DEV, f->fu_fname);
2450                                 break;
2451
2452                         case F_FORW:
2453                                 switch (f->fu_forw_addr->ai_addr->sa_family) {
2454 #ifdef INET
2455                                 case AF_INET:
2456                                         port = ntohs(satosin(f->fu_forw_addr->ai_addr)->sin_port);
2457                                         break;
2458 #endif
2459 #ifdef INET6
2460                                 case AF_INET6:
2461                                         port = ntohs(satosin6(f->fu_forw_addr->ai_addr)->sin6_port);
2462                                         break;
2463 #endif
2464                                 default:
2465                                         port = 0;
2466                                 }
2467                                 if (port != 514) {
2468                                         printf("%s:%d",
2469                                                 f->fu_forw_hname, port);
2470                                 } else {
2471                                         printf("%s", f->fu_forw_hname);
2472                                 }
2473                                 break;
2474
2475                         case F_PIPE:
2476                                 printf("%s", f->fu_pipe_pname);
2477                                 break;
2478
2479                         case F_USERS:
2480                                 for (i = 0; i < MAXUNAMES && *f->fu_uname[i]; i++)
2481                                         printf("%s, ", f->fu_uname[i]);
2482                                 break;
2483                         }
2484                         if (f->f_program)
2485                                 printf(" (%s)", f->f_program);
2486                         printf("\n");
2487                 }
2488         }
2489
2490         logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL,
2491             NULL, NULL, "restart", 0);
2492         dprintf("syslogd: restarted\n");
2493         /*
2494          * Log a change in hostname, but only on a restart.
2495          */
2496         if (signo != 0 && strcmp(oldLocalHostName, LocalHostName) != 0) {
2497                 (void)snprintf(hostMsg, sizeof(hostMsg),
2498                     "hostname changed, \"%s\" to \"%s\"",
2499                     oldLocalHostName, LocalHostName);
2500                 logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd",
2501                     NULL, NULL, NULL, hostMsg, 0);
2502                 dprintf("%s\n", hostMsg);
2503         }
2504         /*
2505          * Log the kernel boot file if we aren't going to use it as
2506          * the prefix, and if this is *not* a restart.
2507          */
2508         if (signo == 0 && !use_bootfile) {
2509                 (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
2510                     "kernel boot file is %s", bootfile);
2511                 logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd",
2512                     NULL, NULL, NULL, bootfileMsg, 0);
2513                 dprintf("%s\n", bootfileMsg);
2514         }
2515 }
2516
2517 /*
2518  * Crack a configuration file line
2519  */
2520 static struct filed *
2521 cfline(const char *line, const char *prog, const char *host)
2522 {
2523         struct filed *f;
2524         struct addrinfo hints, *res;
2525         int error, i, pri, syncfile;
2526         const char *p, *q;
2527         char *bp;
2528         char buf[MAXLINE], ebuf[100];
2529
2530         dprintf("cfline(\"%s\", f, \"%s\", \"%s\")\n", line, prog, host);
2531
2532         f = calloc(1, sizeof(*f));
2533         if (f == NULL) {
2534                 logerror("malloc");
2535                 exit(1);
2536         }
2537         errno = 0;      /* keep strerror() stuff out of logerror messages */
2538
2539         for (i = 0; i <= LOG_NFACILITIES; i++)
2540                 f->f_pmask[i] = INTERNAL_NOPRI;
2541
2542         /* save hostname if any */
2543         if (host && *host == '*')
2544                 host = NULL;
2545         if (host) {
2546                 int hl;
2547
2548                 f->f_host = strdup(host);
2549                 if (f->f_host == NULL) {
2550                         logerror("strdup");
2551                         exit(1);
2552                 }
2553                 hl = strlen(f->f_host);
2554                 if (hl > 0 && f->f_host[hl-1] == '.')
2555                         f->f_host[--hl] = '\0';
2556                 trimdomain(f->f_host, hl);
2557         }
2558
2559         /* save program name if any */
2560         if (prog && *prog == '*')
2561                 prog = NULL;
2562         if (prog) {
2563                 f->f_program = strdup(prog);
2564                 if (f->f_program == NULL) {
2565                         logerror("strdup");
2566                         exit(1);
2567                 }
2568         }
2569
2570         /* scan through the list of selectors */
2571         for (p = line; *p && *p != '\t' && *p != ' ';) {
2572                 int pri_done;
2573                 int pri_cmp;
2574                 int pri_invert;
2575
2576                 /* find the end of this facility name list */
2577                 for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.'; )
2578                         continue;
2579
2580                 /* get the priority comparison */
2581                 pri_cmp = 0;
2582                 pri_done = 0;
2583                 pri_invert = 0;
2584                 if (*q == '!') {
2585                         pri_invert = 1;
2586                         q++;
2587                 }
2588                 while (!pri_done) {
2589                         switch (*q) {
2590                         case '<':
2591                                 pri_cmp |= PRI_LT;
2592                                 q++;
2593                                 break;
2594                         case '=':
2595                                 pri_cmp |= PRI_EQ;
2596                                 q++;
2597                                 break;
2598                         case '>':
2599                                 pri_cmp |= PRI_GT;
2600                                 q++;
2601                                 break;
2602                         default:
2603                                 pri_done++;
2604                                 break;
2605                         }
2606                 }
2607
2608                 /* collect priority name */
2609                 for (bp = buf; *q && !strchr("\t,; ", *q); )
2610                         *bp++ = *q++;
2611                 *bp = '\0';
2612
2613                 /* skip cruft */
2614                 while (strchr(",;", *q))
2615                         q++;
2616
2617                 /* decode priority name */
2618                 if (*buf == '*') {
2619                         pri = LOG_PRIMASK;
2620                         pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
2621                 } else {
2622                         /* Ignore trailing spaces. */
2623                         for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
2624                                 buf[i] = '\0';
2625
2626                         pri = decode(buf, prioritynames);
2627                         if (pri < 0) {
2628                                 errno = 0;
2629                                 (void)snprintf(ebuf, sizeof ebuf,
2630                                     "unknown priority name \"%s\"", buf);
2631                                 logerror(ebuf);
2632                                 free(f);
2633                                 return (NULL);
2634                         }
2635                 }
2636                 if (!pri_cmp)
2637                         pri_cmp = (UniquePriority)
2638                                   ? (PRI_EQ)
2639                                   : (PRI_EQ | PRI_GT)
2640                                   ;
2641                 if (pri_invert)
2642                         pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;
2643
2644                 /* scan facilities */
2645                 while (*p && !strchr("\t.; ", *p)) {
2646                         for (bp = buf; *p && !strchr("\t,;. ", *p); )
2647                                 *bp++ = *p++;
2648                         *bp = '\0';
2649
2650                         if (*buf == '*') {
2651                                 for (i = 0; i < LOG_NFACILITIES; i++) {
2652                                         f->f_pmask[i] = pri;
2653                                         f->f_pcmp[i] = pri_cmp;
2654                                 }
2655                         } else {
2656                                 i = decode(buf, facilitynames);
2657                                 if (i < 0) {
2658                                         errno = 0;
2659                                         (void)snprintf(ebuf, sizeof ebuf,
2660                                             "unknown facility name \"%s\"",
2661                                             buf);
2662                                         logerror(ebuf);
2663                                         free(f);
2664                                         return (NULL);
2665                                 }
2666                                 f->f_pmask[i >> 3] = pri;
2667                                 f->f_pcmp[i >> 3] = pri_cmp;
2668                         }
2669                         while (*p == ',' || *p == ' ')
2670                                 p++;
2671                 }
2672
2673                 p = q;
2674         }
2675
2676         /* skip to action part */
2677         while (*p == '\t' || *p == ' ')
2678                 p++;
2679
2680         if (*p == '-') {
2681                 syncfile = 0;
2682                 p++;
2683         } else
2684                 syncfile = 1;
2685
2686         switch (*p) {
2687         case '@':
2688                 {
2689                         char *tp;
2690                         char endkey = ':';
2691                         /*
2692                          * scan forward to see if there is a port defined.
2693                          * so we can't use strlcpy..
2694                          */
2695                         i = sizeof(f->fu_forw_hname);
2696                         tp = f->fu_forw_hname;
2697                         p++;
2698
2699                         /*
2700                          * an ipv6 address should start with a '[' in that case
2701                          * we should scan for a ']'
2702                          */
2703                         if (*p == '[') {
2704                                 p++;
2705                                 endkey = ']';
2706                         }
2707                         while (*p && (*p != endkey) && (i-- > 0)) {
2708                                 *tp++ = *p++;
2709                         }
2710                         if (endkey == ']' && *p == endkey)
2711                                 p++;
2712                         *tp = '\0';
2713                 }
2714                 /* See if we copied a domain and have a port */
2715                 if (*p == ':')
2716                         p++;
2717                 else
2718                         p = NULL;
2719
2720                 hints = (struct addrinfo){
2721                         .ai_family = family,
2722                         .ai_socktype = SOCK_DGRAM
2723                 };
2724                 error = getaddrinfo(f->fu_forw_hname,
2725                                 p ? p : "syslog", &hints, &res);
2726                 if (error) {
2727                         logerror(gai_strerror(error));
2728                         break;
2729                 }
2730                 f->fu_forw_addr = res;
2731                 f->f_type = F_FORW;
2732                 break;
2733
2734         case '/':
2735                 if ((f->f_file = open(p, logflags, 0600)) < 0) {
2736                         f->f_type = F_UNUSED;
2737                         logerror(p);
2738                         break;
2739                 }
2740                 if (syncfile)
2741                         f->f_flags |= FFLAG_SYNC;
2742                 if (isatty(f->f_file)) {
2743                         if (strcmp(p, ctty) == 0)
2744                                 f->f_type = F_CONSOLE;
2745                         else
2746                                 f->f_type = F_TTY;
2747                         (void)strlcpy(f->fu_fname, p + sizeof(_PATH_DEV) - 1,
2748                             sizeof(f->fu_fname));
2749                 } else {
2750                         (void)strlcpy(f->fu_fname, p, sizeof(f->fu_fname));
2751                         f->f_type = F_FILE;
2752                 }
2753                 break;
2754
2755         case '|':
2756                 f->fu_pipe_pid = 0;
2757                 (void)strlcpy(f->fu_pipe_pname, p + 1,
2758                     sizeof(f->fu_pipe_pname));
2759                 f->f_type = F_PIPE;
2760                 break;
2761
2762         case '*':
2763                 f->f_type = F_WALL;
2764                 break;
2765
2766         default:
2767                 for (i = 0; i < MAXUNAMES && *p; i++) {
2768                         for (q = p; *q && *q != ','; )
2769                                 q++;
2770                         (void)strncpy(f->fu_uname[i], p, MAXLOGNAME - 1);
2771                         if ((q - p) >= MAXLOGNAME)
2772                                 f->fu_uname[i][MAXLOGNAME - 1] = '\0';
2773                         else
2774                                 f->fu_uname[i][q - p] = '\0';
2775                         while (*q == ',' || *q == ' ')
2776                                 q++;
2777                         p = q;
2778                 }
2779                 f->f_type = F_USERS;
2780                 break;
2781         }
2782         return (f);
2783 }
2784
2785
2786 /*
2787  *  Decode a symbolic name to a numeric value
2788  */
2789 static int
2790 decode(const char *name, const CODE *codetab)
2791 {
2792         const CODE *c;
2793         char *p, buf[40];
2794
2795         if (isdigit(*name))
2796                 return (atoi(name));
2797
2798         for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
2799                 if (isupper(*name))
2800                         *p = tolower(*name);
2801                 else
2802                         *p = *name;
2803         }
2804         *p = '\0';
2805         for (c = codetab; c->c_name; c++)
2806                 if (!strcmp(buf, c->c_name))
2807                         return (c->c_val);
2808
2809         return (-1);
2810 }
2811
2812 static void
2813 markit(void)
2814 {
2815         struct filed *f;
2816         struct deadq_entry *dq, *dq0;
2817
2818         now = time((time_t *)NULL);
2819         MarkSeq += TIMERINTVL;
2820         if (MarkSeq >= MarkInterval) {
2821                 logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL,
2822                     "-- MARK --", MARK);
2823                 MarkSeq = 0;
2824         }
2825
2826         STAILQ_FOREACH(f, &fhead, next) {
2827                 if (f->f_prevcount && now >= REPEATTIME(f)) {
2828                         dprintf("flush %s: repeated %d times, %d sec.\n",
2829                             TypeNames[f->f_type], f->f_prevcount,
2830                             repeatinterval[f->f_repeatcount]);
2831                         fprintlog_successive(f, 0);
2832                         BACKOFF(f);
2833                 }
2834         }
2835
2836         /* Walk the dead queue, and see if we should signal somebody. */
2837         TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) {
2838                 switch (dq->dq_timeout) {
2839                 case 0:
2840                         /* Already signalled once, try harder now. */
2841                         if (kill(dq->dq_pid, SIGKILL) != 0)
2842                                 (void)deadq_remove(dq);
2843                         break;
2844
2845                 case 1:
2846                         /*
2847                          * Timed out on dead queue, send terminate
2848                          * signal.  Note that we leave the removal
2849                          * from the dead queue to reapchild(), which
2850                          * will also log the event (unless the process
2851                          * didn't even really exist, in case we simply
2852                          * drop it from the dead queue).
2853                          */
2854                         if (kill(dq->dq_pid, SIGTERM) != 0)
2855                                 (void)deadq_remove(dq);
2856                         else
2857                                 dq->dq_timeout--;
2858                         break;
2859                 default:
2860                         dq->dq_timeout--;
2861                 }
2862         }
2863         MarkSet = 0;
2864         (void)alarm(TIMERINTVL);
2865 }
2866
2867 /*
2868  * fork off and become a daemon, but wait for the child to come online
2869  * before returning to the parent, or we get disk thrashing at boot etc.
2870  * Set a timer so we don't hang forever if it wedges.
2871  */
2872 static int
2873 waitdaemon(int maxwait)
2874 {
2875         int fd;
2876         int status;
2877         pid_t pid, childpid;
2878
2879         switch (childpid = fork()) {
2880         case -1:
2881                 return (-1);
2882         case 0:
2883                 break;
2884         default:
2885                 signal(SIGALRM, timedout);
2886                 alarm(maxwait);
2887                 while ((pid = wait3(&status, 0, NULL)) != -1) {
2888                         if (WIFEXITED(status))
2889                                 errx(1, "child pid %d exited with return code %d",
2890                                         pid, WEXITSTATUS(status));
2891                         if (WIFSIGNALED(status))
2892                                 errx(1, "child pid %d exited on signal %d%s",
2893                                         pid, WTERMSIG(status),
2894                                         WCOREDUMP(status) ? " (core dumped)" :
2895                                         "");
2896                         if (pid == childpid)    /* it's gone... */
2897                                 break;
2898                 }
2899                 exit(0);
2900         }
2901
2902         if (setsid() == -1)
2903                 return (-1);
2904
2905         (void)chdir("/");
2906         if ((fd = open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
2907                 (void)dup2(fd, STDIN_FILENO);
2908                 (void)dup2(fd, STDOUT_FILENO);
2909                 (void)dup2(fd, STDERR_FILENO);
2910                 if (fd > STDERR_FILENO)
2911                         (void)close(fd);
2912         }
2913         return (getppid());
2914 }
2915
2916 /*
2917  * We get a SIGALRM from the child when it's running and finished doing it's
2918  * fsync()'s or O_SYNC writes for all the boot messages.
2919  *
2920  * We also get a signal from the kernel if the timer expires, so check to
2921  * see what happened.
2922  */
2923 static void
2924 timedout(int sig __unused)
2925 {
2926         int left;
2927         left = alarm(0);
2928         signal(SIGALRM, SIG_DFL);
2929         if (left == 0)
2930                 errx(1, "timed out waiting for child");
2931         else
2932                 _exit(0);
2933 }
2934
2935 /*
2936  * Add `s' to the list of allowable peer addresses to accept messages
2937  * from.
2938  *
2939  * `s' is a string in the form:
2940  *
2941  *    [*]domainname[:{servicename|portnumber|*}]
2942  *
2943  * or
2944  *
2945  *    netaddr/maskbits[:{servicename|portnumber|*}]
2946  *
2947  * Returns -1 on error, 0 if the argument was valid.
2948  */
2949 static int
2950 allowaddr(char *s)
2951 {
2952 #if defined(INET) || defined(INET6)
2953         char *cp1, *cp2;
2954         struct allowedpeer *ap;
2955         struct servent *se;
2956         int masklen = -1;
2957         struct addrinfo hints, *res = NULL;
2958 #ifdef INET
2959         in_addr_t *addrp, *maskp;
2960 #endif
2961 #ifdef INET6
2962         uint32_t *addr6p, *mask6p;
2963 #endif
2964         char ip[NI_MAXHOST];
2965
2966         ap = calloc(1, sizeof(*ap));
2967         if (ap == NULL)
2968                 err(1, "malloc failed");
2969
2970 #ifdef INET6
2971         if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
2972 #endif
2973                 cp1 = s;
2974         if ((cp1 = strrchr(cp1, ':'))) {
2975                 /* service/port provided */
2976                 *cp1++ = '\0';
2977                 if (strlen(cp1) == 1 && *cp1 == '*')
2978                         /* any port allowed */
2979                         ap->port = 0;
2980                 else if ((se = getservbyname(cp1, "udp"))) {
2981                         ap->port = ntohs(se->s_port);
2982                 } else {
2983                         ap->port = strtol(cp1, &cp2, 0);
2984                         /* port not numeric */
2985                         if (*cp2 != '\0')
2986                                 goto err;
2987                 }
2988         } else {
2989                 if ((se = getservbyname("syslog", "udp")))
2990                         ap->port = ntohs(se->s_port);
2991                 else
2992                         /* sanity, should not happen */
2993                         ap->port = 514;
2994         }
2995
2996         if ((cp1 = strchr(s, '/')) != NULL &&
2997             strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
2998                 *cp1 = '\0';
2999                 if ((masklen = atoi(cp1 + 1)) < 0)
3000                         goto err;
3001         }
3002 #ifdef INET6
3003         if (*s == '[') {
3004                 cp2 = s + strlen(s) - 1;
3005                 if (*cp2 == ']') {
3006                         ++s;
3007                         *cp2 = '\0';
3008                 } else {
3009                         cp2 = NULL;
3010                 }
3011         } else {
3012                 cp2 = NULL;
3013         }
3014 #endif
3015         hints = (struct addrinfo){
3016                 .ai_family = PF_UNSPEC,
3017                 .ai_socktype = SOCK_DGRAM,
3018                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3019         };
3020         if (getaddrinfo(s, NULL, &hints, &res) == 0) {
3021                 ap->isnumeric = 1;
3022                 memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen);
3023                 ap->a_mask = (struct sockaddr_storage){
3024                         .ss_family = res->ai_family,
3025                         .ss_len = res->ai_addrlen
3026                 };
3027                 switch (res->ai_family) {
3028 #ifdef INET
3029                 case AF_INET:
3030                         maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr;
3031                         addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr;
3032                         if (masklen < 0) {
3033                                 /* use default netmask */
3034                                 if (IN_CLASSA(ntohl(*addrp)))
3035                                         *maskp = htonl(IN_CLASSA_NET);
3036                                 else if (IN_CLASSB(ntohl(*addrp)))
3037                                         *maskp = htonl(IN_CLASSB_NET);
3038                                 else
3039                                         *maskp = htonl(IN_CLASSC_NET);
3040                         } else if (masklen == 0) {
3041                                 *maskp = 0;
3042                         } else if (masklen <= 32) {
3043                                 /* convert masklen to netmask */
3044                                 *maskp = htonl(~((1 << (32 - masklen)) - 1));
3045                         } else {
3046                                 goto err;
3047                         }
3048                         /* Lose any host bits in the network number. */
3049                         *addrp &= *maskp;
3050                         break;
3051 #endif
3052 #ifdef INET6
3053                 case AF_INET6:
3054                         if (masklen > 128)
3055                                 goto err;
3056
3057                         if (masklen < 0)
3058                                 masklen = 128;
3059                         mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
3060                         addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0];
3061                         /* convert masklen to netmask */
3062                         while (masklen > 0) {
3063                                 if (masklen < 32) {
3064                                         *mask6p =
3065                                             htonl(~(0xffffffff >> masklen));
3066                                         *addr6p &= *mask6p;
3067                                         break;
3068                                 } else {
3069                                         *mask6p++ = 0xffffffff;
3070                                         addr6p++;
3071                                         masklen -= 32;
3072                                 }
3073                         }
3074                         break;
3075 #endif
3076                 default:
3077                         goto err;
3078                 }
3079                 freeaddrinfo(res);
3080         } else {
3081                 /* arg `s' is domain name */
3082                 ap->isnumeric = 0;
3083                 ap->a_name = s;
3084                 if (cp1)
3085                         *cp1 = '/';
3086 #ifdef INET6
3087                 if (cp2) {
3088                         *cp2 = ']';
3089                         --s;
3090                 }
3091 #endif
3092         }
3093         STAILQ_INSERT_TAIL(&aphead, ap, next);
3094
3095         if (Debug) {
3096                 printf("allowaddr: rule ");
3097                 if (ap->isnumeric) {
3098                         printf("numeric, ");
3099                         getnameinfo(sstosa(&ap->a_addr),
3100                                     (sstosa(&ap->a_addr))->sa_len,
3101                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3102                         printf("addr = %s, ", ip);
3103                         getnameinfo(sstosa(&ap->a_mask),
3104                                     (sstosa(&ap->a_mask))->sa_len,
3105                                     ip, sizeof ip, NULL, 0, NI_NUMERICHOST);
3106                         printf("mask = %s; ", ip);
3107                 } else {
3108                         printf("domainname = %s; ", ap->a_name);
3109                 }
3110                 printf("port = %d\n", ap->port);
3111         }
3112 #endif
3113
3114         return (0);
3115 err:
3116         if (res != NULL)
3117                 freeaddrinfo(res);
3118         free(ap);
3119         return (-1);
3120 }
3121
3122 /*
3123  * Validate that the remote peer has permission to log to us.
3124  */
3125 static int
3126 validate(struct sockaddr *sa, const char *hname)
3127 {
3128         int i;
3129         char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
3130         struct allowedpeer *ap;
3131 #ifdef INET
3132         struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
3133 #endif
3134 #ifdef INET6
3135         struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
3136 #endif
3137         struct addrinfo hints, *res;
3138         u_short sport;
3139         int num = 0;
3140
3141         STAILQ_FOREACH(ap, &aphead, next) {
3142                 num++;
3143         }
3144         dprintf("# of validation rule: %d\n", num);
3145         if (num == 0)
3146                 /* traditional behaviour, allow everything */
3147                 return (1);
3148
3149         (void)strlcpy(name, hname, sizeof(name));
3150         hints = (struct addrinfo){
3151                 .ai_family = PF_UNSPEC,
3152                 .ai_socktype = SOCK_DGRAM,
3153                 .ai_flags = AI_PASSIVE | AI_NUMERICHOST
3154         };
3155         if (getaddrinfo(name, NULL, &hints, &res) == 0)
3156                 freeaddrinfo(res);
3157         else if (strchr(name, '.') == NULL) {
3158                 strlcat(name, ".", sizeof name);
3159                 strlcat(name, LocalDomain, sizeof name);
3160         }
3161         if (getnameinfo(sa, sa->sa_len, ip, sizeof(ip), port, sizeof(port),
3162                         NI_NUMERICHOST | NI_NUMERICSERV) != 0)
3163                 return (0);     /* for safety, should not occur */
3164         dprintf("validate: dgram from IP %s, port %s, name %s;\n",
3165                 ip, port, name);
3166         sport = atoi(port);
3167
3168         /* now, walk down the list */
3169         i = 0;
3170         STAILQ_FOREACH(ap, &aphead, next) {
3171                 i++;
3172                 if (ap->port != 0 && ap->port != sport) {
3173                         dprintf("rejected in rule %d due to port mismatch.\n",
3174                             i);
3175                         continue;
3176                 }
3177
3178                 if (ap->isnumeric) {
3179                         if (ap->a_addr.ss_family != sa->sa_family) {
3180                                 dprintf("rejected in rule %d due to address family mismatch.\n", i);
3181                                 continue;
3182                         }
3183 #ifdef INET
3184                         else if (ap->a_addr.ss_family == AF_INET) {
3185                                 sin4 = satosin(sa);
3186                                 a4p = satosin(&ap->a_addr);
3187                                 m4p = satosin(&ap->a_mask);
3188                                 if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
3189                                     != a4p->sin_addr.s_addr) {
3190                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3191                                         continue;
3192                                 }
3193                         }
3194 #endif
3195 #ifdef INET6
3196                         else if (ap->a_addr.ss_family == AF_INET6) {
3197                                 sin6 = satosin6(sa);
3198                                 a6p = satosin6(&ap->a_addr);
3199                                 m6p = satosin6(&ap->a_mask);
3200                                 if (a6p->sin6_scope_id != 0 &&
3201                                     sin6->sin6_scope_id != a6p->sin6_scope_id) {
3202                                         dprintf("rejected in rule %d due to scope mismatch.\n", i);
3203                                         continue;
3204                                 }
3205                                 if (IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr,
3206                                     &a6p->sin6_addr, &m6p->sin6_addr) != 0) {
3207                                         dprintf("rejected in rule %d due to IP mismatch.\n", i);
3208                                         continue;
3209                                 }
3210                         }
3211 #endif
3212                         else
3213                                 continue;
3214                 } else {
3215                         if (fnmatch(ap->a_name, name, FNM_NOESCAPE) ==
3216                             FNM_NOMATCH) {
3217                                 dprintf("rejected in rule %d due to name "
3218                                     "mismatch.\n", i);
3219                                 continue;
3220                         }
3221                 }
3222                 dprintf("accepted in rule %d.\n", i);
3223                 return (1);     /* hooray! */
3224         }
3225         return (0);
3226 }
3227
3228 /*
3229  * Fairly similar to popen(3), but returns an open descriptor, as
3230  * opposed to a FILE *.
3231  */
3232 static int
3233 p_open(const char *prog, pid_t *rpid)
3234 {
3235         int pfd[2], nulldesc;
3236         pid_t pid;
3237         char *argv[4]; /* sh -c cmd NULL */
3238         char errmsg[200];
3239
3240         if (pipe(pfd) == -1)
3241                 return (-1);
3242         if ((nulldesc = open(_PATH_DEVNULL, O_RDWR)) == -1)
3243                 /* we are royally screwed anyway */
3244                 return (-1);
3245
3246         switch ((pid = fork())) {
3247         case -1:
3248                 close(nulldesc);
3249                 return (-1);
3250
3251         case 0:
3252                 (void)setsid(); /* Avoid catching SIGHUPs. */
3253                 argv[0] = strdup("sh");
3254                 argv[1] = strdup("-c");
3255                 argv[2] = strdup(prog);
3256                 argv[3] = NULL;
3257                 if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL) {
3258                         logerror("strdup");
3259                         exit(1);
3260                 }
3261
3262                 alarm(0);
3263
3264                 /* Restore signals marked as SIG_IGN. */
3265                 (void)signal(SIGINT, SIG_DFL);
3266                 (void)signal(SIGQUIT, SIG_DFL);
3267                 (void)signal(SIGPIPE, SIG_DFL);
3268
3269                 dup2(pfd[0], STDIN_FILENO);
3270                 dup2(nulldesc, STDOUT_FILENO);
3271                 dup2(nulldesc, STDERR_FILENO);
3272                 closefrom(STDERR_FILENO + 1);
3273
3274                 (void)execvp(_PATH_BSHELL, argv);
3275                 _exit(255);
3276         }
3277         close(nulldesc);
3278         close(pfd[0]);
3279         /*
3280          * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
3281          * supposed to get an EWOULDBLOCK on writev(2), which is
3282          * caught by the logic above anyway, which will in turn close
3283          * the pipe, and fork a new logging subprocess if necessary.
3284          * The stale subprocess will be killed some time later unless
3285          * it terminated itself due to closing its input pipe (so we
3286          * get rid of really dead puppies).
3287          */
3288         if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
3289                 /* This is bad. */
3290                 (void)snprintf(errmsg, sizeof errmsg,
3291                                "Warning: cannot change pipe to PID %d to "
3292                                "non-blocking behaviour.",
3293                                (int)pid);
3294                 logerror(errmsg);
3295         }
3296         *rpid = pid;
3297         return (pfd[1]);
3298 }
3299
3300 static void
3301 deadq_enter(pid_t pid, const char *name)
3302 {
3303         struct deadq_entry *dq;
3304         int status;
3305
3306         if (pid == 0)
3307                 return;
3308         /*
3309          * Be paranoid, if we can't signal the process, don't enter it
3310          * into the dead queue (perhaps it's already dead).  If possible,
3311          * we try to fetch and log the child's status.
3312          */
3313         if (kill(pid, 0) != 0) {
3314                 if (waitpid(pid, &status, WNOHANG) > 0)
3315                         log_deadchild(pid, status, name);
3316                 return;
3317         }
3318
3319         dq = malloc(sizeof(*dq));
3320         if (dq == NULL) {
3321                 logerror("malloc");
3322                 exit(1);
3323         }
3324         *dq = (struct deadq_entry){
3325                 .dq_pid = pid,
3326                 .dq_timeout = DQ_TIMO_INIT
3327         };
3328         TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries);
3329 }
3330
3331 static int
3332 deadq_remove(struct deadq_entry *dq)
3333 {
3334         if (dq != NULL) {
3335                 TAILQ_REMOVE(&deadq_head, dq, dq_entries);
3336                 free(dq);
3337                 return (1);
3338         }
3339
3340         return (0);
3341 }
3342
3343 static int
3344 deadq_removebypid(pid_t pid)
3345 {
3346         struct deadq_entry *dq;
3347
3348         TAILQ_FOREACH(dq, &deadq_head, dq_entries) {
3349                 if (dq->dq_pid == pid)
3350                         break;
3351         }
3352         return (deadq_remove(dq));
3353 }
3354
3355 static void
3356 log_deadchild(pid_t pid, int status, const char *name)
3357 {
3358         int code;
3359         char buf[256];
3360         const char *reason;
3361
3362         errno = 0; /* Keep strerror() stuff out of logerror messages. */
3363         if (WIFSIGNALED(status)) {
3364                 reason = "due to signal";
3365                 code = WTERMSIG(status);
3366         } else {
3367                 reason = "with status";
3368                 code = WEXITSTATUS(status);
3369                 if (code == 0)
3370                         return;
3371         }
3372         (void)snprintf(buf, sizeof buf,
3373                        "Logging subprocess %d (%s) exited %s %d.",
3374                        pid, name, reason, code);
3375         logerror(buf);
3376 }
3377
3378 static int
3379 socksetup(struct peer *pe)
3380 {
3381         struct addrinfo hints, *res, *res0;
3382         int error;
3383         char *cp;
3384         int (*sl_recv)(struct socklist *);
3385         /*
3386          * We have to handle this case for backwards compatibility:
3387          * If there are two (or more) colons but no '[' and ']',
3388          * assume this is an inet6 address without a service.
3389          */
3390         if (pe->pe_name != NULL) {
3391 #ifdef INET6
3392                 if (pe->pe_name[0] == '[' &&
3393                     (cp = strchr(pe->pe_name + 1, ']')) != NULL) {
3394                         pe->pe_name = &pe->pe_name[1];
3395                         *cp = '\0';
3396                         if (cp[1] == ':' && cp[2] != '\0')
3397                                 pe->pe_serv = cp + 2;
3398                 } else {
3399 #endif
3400                         cp = strchr(pe->pe_name, ':');
3401                         if (cp != NULL && strchr(cp + 1, ':') == NULL) {
3402                                 *cp = '\0';
3403                                 if (cp[1] != '\0')
3404                                         pe->pe_serv = cp + 1;
3405                                 if (cp == pe->pe_name)
3406                                         pe->pe_name = NULL;
3407                         }
3408 #ifdef INET6
3409                 }
3410 #endif
3411         }
3412         hints = (struct addrinfo){
3413                 .ai_family = AF_UNSPEC,
3414                 .ai_socktype = SOCK_DGRAM,
3415                 .ai_flags = AI_PASSIVE
3416         };
3417         if (pe->pe_name != NULL)
3418                 dprintf("Trying peer: %s\n", pe->pe_name);
3419         if (pe->pe_serv == NULL)
3420                 pe->pe_serv = "syslog";
3421         error = getaddrinfo(pe->pe_name, pe->pe_serv, &hints, &res0);
3422         if (error) {
3423                 char *msgbuf;
3424
3425                 asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s",
3426                     pe->pe_name == NULL ? "" : pe->pe_name, pe->pe_serv,
3427                     gai_strerror(error));
3428                 errno = 0;
3429                 if (msgbuf == NULL)
3430                         logerror(gai_strerror(error));
3431                 else
3432                         logerror(msgbuf);
3433                 free(msgbuf);
3434                 die(0);
3435         }
3436         for (res = res0; res != NULL; res = res->ai_next) {
3437                 int s;
3438
3439                 if (res->ai_family != AF_LOCAL &&
3440                     SecureMode > 1) {
3441                         /* Only AF_LOCAL in secure mode. */
3442                         continue;
3443                 }
3444                 if (family != AF_UNSPEC &&
3445                     res->ai_family != AF_LOCAL && res->ai_family != family)
3446                         continue;
3447
3448                 s = socket(res->ai_family, res->ai_socktype,
3449                     res->ai_protocol);
3450                 if (s < 0) {
3451                         logerror("socket");
3452                         error++;
3453                         continue;
3454                 }
3455 #ifdef INET6
3456                 if (res->ai_family == AF_INET6) {
3457                         if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
3458                                &(int){1}, sizeof(int)) < 0) {
3459                                 logerror("setsockopt(IPV6_V6ONLY)");
3460                                 close(s);
3461                                 error++;
3462                                 continue;
3463                         }
3464                 }
3465 #endif
3466                 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
3467                     &(int){1}, sizeof(int)) < 0) {
3468                         logerror("setsockopt(SO_REUSEADDR)");
3469                         close(s);
3470                         error++;
3471                         continue;
3472                 }
3473
3474                 /*
3475                  * Bind INET and UNIX-domain sockets.
3476                  *
3477                  * A UNIX-domain socket is always bound to a pathname
3478                  * regardless of -N flag.
3479                  *
3480                  * For INET sockets, RFC 3164 recommends that client
3481                  * side message should come from the privileged syslogd port.
3482                  *
3483                  * If the system administrator chooses not to obey
3484                  * this, we can skip the bind() step so that the
3485                  * system will choose a port for us.
3486                  */
3487                 if (res->ai_family == AF_LOCAL)
3488                         unlink(pe->pe_name);
3489                 if (res->ai_family == AF_LOCAL ||
3490                     NoBind == 0 || pe->pe_name != NULL) {
3491                         if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
3492                                 logerror("bind");
3493                                 close(s);
3494                                 error++;
3495                                 continue;
3496                         }
3497                         if (res->ai_family == AF_LOCAL ||
3498                             SecureMode == 0)
3499                                 increase_rcvbuf(s);
3500                 }
3501                 if (res->ai_family == AF_LOCAL &&
3502                     chmod(pe->pe_name, pe->pe_mode) < 0) {
3503                         dprintf("chmod %s: %s\n", pe->pe_name,
3504                             strerror(errno));
3505                         close(s);
3506                         error++;
3507                         continue;
3508                 }
3509                 dprintf("new socket fd is %d\n", s);
3510                 if (res->ai_socktype != SOCK_DGRAM) {
3511                         listen(s, 5);
3512                 }
3513                 sl_recv = socklist_recv_sock;
3514 #if defined(INET) || defined(INET6)
3515                 if (SecureMode && (res->ai_family == AF_INET ||
3516                     res->ai_family == AF_INET6)) {
3517                         dprintf("shutdown\n");
3518                         /* Forbid communication in secure mode. */
3519                         if (shutdown(s, SHUT_RD) < 0 &&
3520                             errno != ENOTCONN) {
3521                                 logerror("shutdown");
3522                                 if (!Debug)
3523                                         die(0);
3524                         }
3525                         sl_recv = NULL;
3526                 } else
3527 #endif
3528                         dprintf("listening on socket\n");
3529                 dprintf("sending on socket\n");
3530                 addsock(res->ai_addr, res->ai_addrlen,
3531                     &(struct socklist){
3532                         .sl_socket = s,
3533                         .sl_peer = pe,
3534                         .sl_recv = sl_recv
3535                 });
3536         }
3537         freeaddrinfo(res0);
3538
3539         return(error);
3540 }
3541
3542 static void
3543 increase_rcvbuf(int fd)
3544 {
3545         socklen_t len;
3546
3547         if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len,
3548             &(socklen_t){sizeof(len)}) == 0) {
3549                 if (len < RCVBUF_MINSIZE) {
3550                         len = RCVBUF_MINSIZE;
3551                         setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
3552                 }
3553         }
3554 }