/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 1988, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2018 Prodrive Technologies, https://prodrive-technologies.com/
 * Author: Ed Schouten <ed@FreeBSD.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 *  syslogd -- log system messages
 *
 * This program implements a system log. It takes a series of lines.
 * Each line may have a priority, signified as "<n>" as
 * the first characters of the line.  If this is
 * not present, a default priority is used.
 *
 * To kill syslogd, send a signal 15 (terminate).  A signal 1 (hup) will
 * cause it to reread its configuration file.
 *
 * Author: Eric Allman
 * extensive changes by Ralph Campbell
 * more extensive changes by Eric Allman (again)
 * Extension to log by program name as well as facility and priority
 *   by Peter da Silva.
 * -u and -v by Harlan Stenn.
 * Priority comparison code by Harlan Stenn.
 */

#define DEFUPRI         (LOG_USER|LOG_NOTICE)
#define DEFSPRI         (LOG_KERN|LOG_CRIT)
#define TIMERINTVL      30              /* interval for checking flush, mark */
#define TTYMSGTIME      1               /* timeout passed to ttymsg */
#define RCVBUF_MINSIZE  (80 * 1024)     /* minimum size of dgram rcv buffer */

#include <sys/param.h>
#include <sys/event.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/procdesc.h>
#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syslimits.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <sys/wait.h>

#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <arpa/inet.h>
#endif

#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <libgen.h>
#include <libutil.h>
#include <limits.h>
#include <netdb.h>
#include <paths.h>
#include <poll.h>
#include <regex.h>
#include <signal.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
#include <utmpx.h>

#include "pathnames.h"
#include "syslogd.h"
#include "syslogd_cap.h"

const char *ConfFile = _PATH_LOGCONF;
static const char *PidFile = _PATH_LOGPID;
static const char include_str[] = "include";
static const char include_ext[] = ".conf";

#define dprintf         if (Debug) printf

#define sstosa(ss)      ((struct sockaddr *)(ss))
#ifdef INET
#define sstosin(ss)     ((struct sockaddr_in *)(void *)(ss))
#define satosin(sa)     ((struct sockaddr_in *)(void *)(sa))
#endif
#ifdef INET6
#define sstosin6(ss)    ((struct sockaddr_in6 *)(void *)(ss))
#define satosin6(sa)    ((struct sockaddr_in6 *)(void *)(sa))
#define s6_addr32       __u6_addr.__u6_addr32
#define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m)      (       \
        (((d)->s6_addr32[0] ^ (a)->s6_addr32[0]) & (m)->s6_addr32[0]) == 0 && \
        (((d)->s6_addr32[1] ^ (a)->s6_addr32[1]) & (m)->s6_addr32[1]) == 0 && \
        (((d)->s6_addr32[2] ^ (a)->s6_addr32[2]) & (m)->s6_addr32[2]) == 0 && \
        (((d)->s6_addr32[3] ^ (a)->s6_addr32[3]) & (m)->s6_addr32[3]) == 0 )
#endif

/*
 * List of peers and sockets that can't be bound until
 * flags have been parsed.
 */
struct peer {
        const char      *pe_name;
        const char      *pe_serv;
        mode_t          pe_mode;
        STAILQ_ENTRY(peer)      next;
};
static STAILQ_HEAD(, peer) pqueue = STAILQ_HEAD_INITIALIZER(pqueue);

/*
 * Sockets used for logging; monitored by kevent().
 */
struct socklist {
        struct addrinfo         sl_ai;
#define sl_sa           sl_ai.ai_addr
#define sl_salen        sl_ai.ai_addrlen
#define sl_family       sl_ai.ai_family
        int                     sl_socket;
        char                    *sl_name;
        int                     sl_dirfd;
        int                     (*sl_recv)(struct socklist *);
        STAILQ_ENTRY(socklist)  next;
};
static STAILQ_HEAD(, socklist) shead = STAILQ_HEAD_INITIALIZER(shead);

/*
 * Flags to logmsg().
 */

#define IGN_CONS        0x001   /* don't print on console */
#define SYNC_FILE       0x002   /* do fsync on file after printing */
#define MARK            0x008   /* this message is a mark */
#define ISKERNEL        0x010   /* kernel generated message */

/* Traditional syslog timestamp format. */
#define RFC3164_DATELEN 15
#define RFC3164_DATEFMT "%b %e %H:%M:%S"

/*
 * FORMAT_BSD_LEGACY and FORMAT_RFC3164_STRICT are two variations of
 * the RFC 3164 logging format.
 */
#define IS_RFC3164_FORMAT (output_format == FORMAT_BSD_LEGACY ||        \
output_format == FORMAT_RFC3164_STRICT)

static STAILQ_HEAD(, filed) fhead =
    STAILQ_HEAD_INITIALIZER(fhead);     /* Log files that we write to */
static struct filed consfile;           /* Console */

/*
 * Queue of about-to-be dead processes we should watch out for.
 */
struct deadq_entry {
        int                             dq_procdesc;
        int                             dq_timeout;
        TAILQ_ENTRY(deadq_entry)        dq_entries;
};
static TAILQ_HEAD(, deadq_entry) deadq_head =
    TAILQ_HEAD_INITIALIZER(deadq_head);

/*
 * The timeout to apply to processes waiting on the dead queue.  Unit
 * of measure is `mark intervals', i.e. 20 minutes by default.
 * Processes on the dead queue will be terminated after that time.
 */

#define  DQ_TIMO_INIT   2

/*
 * Network addresses that are allowed to log to us.
 */
struct allowedpeer {
        bool isnumeric;
        u_short port;
        union {
                struct {
                        struct sockaddr_storage addr;
                        struct sockaddr_storage mask;
                } numeric;
                char *name;
        } u;
#define a_addr u.numeric.addr
#define a_mask u.numeric.mask
#define a_name u.name
        STAILQ_ENTRY(allowedpeer)       next;
};
static STAILQ_HEAD(, allowedpeer) aphead = STAILQ_HEAD_INITIALIZER(aphead);

/*
 * Intervals at which we flush out "message repeated" messages,
 * in seconds after previous message is logged.  After each flush,
 * we move to the next interval until we reach the largest.
 */
static int repeatinterval[] = { 30, 120, 600 }; /* # of secs before flush */
#define MAXREPEAT       (nitems(repeatinterval) - 1)
#define REPEATTIME(f)   ((f)->f_time + repeatinterval[(f)->f_repeatcount])
#define BACKOFF(f)      do {                                            \
                                if (++(f)->f_repeatcount > MAXREPEAT)   \
                                        (f)->f_repeatcount = MAXREPEAT; \
                        } while (0)

static const char *TypeNames[] = {
        "UNUSED",
        "FILE",
        "TTY",
        "CONSOLE",
        "FORW",
        "USERS",
        "WALL",
        "PIPE",
};

static const int sigcatch[] = {
        SIGHUP,
        SIGINT,
        SIGQUIT,
        SIGPIPE,
        SIGALRM,
        SIGTERM,
        SIGCHLD,
};

/*
 * Communication channels between syslogd and libcasper
 * services. These channels are used to request external
 * resources while in capability mode.
 */
#ifdef WITH_CASPER
static cap_channel_t *cap_syslogd;
static cap_channel_t *cap_net;
#endif

static int      nulldesc;       /* /dev/null descriptor */
static bool     Debug;          /* debug flag */
static bool     Foreground = false; /* Run in foreground, instead of daemonizing */
static bool     resolve = true; /* resolve hostname */
char            LocalHostName[MAXHOSTNAMELEN];  /* our hostname */
static const char *LocalDomain; /* our local domain name */
static bool     Initialized;    /* set when we have initialized ourselves */
static int      MarkInterval = 20 * 60; /* interval between marks in seconds */
static int      MarkSeq;        /* mark sequence number */
static bool     NoBind;         /* don't bind() as suggested by RFC 3164 */
static int      SecureMode;     /* when true, receive only unix domain socks */
static int      MaxForwardLen = 1024;   /* max length of forwared message */
#ifdef INET6
static int      family = PF_UNSPEC; /* protocol family (IPv4, IPv6 or both) */
#else
static int      family = PF_INET; /* protocol family (IPv4 only) */
#endif
static int      mask_C1 = 1;    /* mask characters from 0x80 - 0x9F */
static int      send_to_all;    /* send message to all IPv4/IPv6 addresses */
static int      use_bootfile;   /* log entire bootfile for every kern msg */
static int      no_compress;    /* don't compress messages (1=pipes, 2=all) */
static int      logflags = O_WRONLY|O_APPEND; /* flags used to open log files */

static char     bootfile[MAXPATHLEN]; /* booted kernel file */

static bool     RemoteAddDate;  /* Always set the date on remote messages */
static bool     RemoteHostname; /* Log remote hostname from the message */

static bool     UniquePriority; /* Only log specified priority? */
static int      LogFacPri;      /* Put facility and priority in log message: */
                                /* 0=no, 1=numeric, 2=names */
static bool     KeepKernFac;    /* Keep remotely logged kernel facility */
static bool     needdofsync = true; /* Are any file(s) waiting to be fsynced? */
static struct pidfh *pfh;
static enum {
        FORMAT_BSD_LEGACY,      /* default, RFC 3164 with legacy deviations */
        FORMAT_RFC3164_STRICT,  /* compliant to RFC 3164 recommendataions */
        FORMAT_RFC5424,         /* RFC 5424 format */
} output_format = FORMAT_BSD_LEGACY;
static int      kq;             /* kqueue(2) descriptor. */

struct iovlist;

static bool     allowaddr(char *);
static void     addpeer(const char *, const char *, mode_t);
static void     addsock(const char *, const char *, mode_t);
static void     cfline(nvlist_t *, const char *, const char *, const char *,
    const char *);
static const char *cvthname(struct sockaddr *);
static struct deadq_entry *deadq_enter(int);
static void     deadq_remove(struct deadq_entry *);
static int      decode(const char *, const CODE *);
static void     die(int) __dead2;
static void     dofsync(void);
static void     fprintlog_first(struct filed *, const char *, const char *,
    const char *, const char *, const char *, const char *, int);
static void     fprintlog_write(struct filed *, struct iovlist *, int);
static void     fprintlog_successive(struct filed *, int);
static void     init(bool);
static void     logmsg(int, const struct logtime *, const char *, const char *,
    const char *, const char *, const char *, const char *, int);
static void     log_deadchild(int, int, const struct filed *);
static void     markit(void);
static struct socklist *socksetup(struct addrinfo *, const char *, mode_t);
static int      socklist_recv_file(struct socklist *);
static int      socklist_recv_sock(struct socklist *);
static int      skip_message(const char *, const char *, int);
static int      evaluate_prop_filter(const struct prop_filter *filter,
    const char *value);
static nvlist_t *prop_filter_compile(const char *);
static void     parsemsg(const char *, char *);
static void     printsys(char *);
static const char *ttymsg_check(struct iovec *, int, char *, int);
static void     usage(void);
static bool     validate(struct sockaddr *, const char *);
static void     unmapped(struct sockaddr *);
static int      waitdaemon(int);
static void     increase_rcvbuf(int);

static void
close_filed(struct filed *f)
{
        if (f->f_type == F_FORW && f->f_addr_fds != NULL) {
                free(f->f_addrs);
                for (size_t i = 0; i < f->f_num_addr_fds; ++i)
                        close(f->f_addr_fds[i]);
                free(f->f_addr_fds);
                f->f_addr_fds = NULL;
                f->f_num_addr_fds = 0;
        } else if (f->f_type == F_PIPE && f->f_procdesc != -1) {
                f->f_dq = deadq_enter(f->f_procdesc);
        }

        f->f_type = F_UNUSED;

        if (f->f_file != -1)
                (void)close(f->f_file);
        f->f_file = -1;
}

static void
addpeer(const char *name, const char *serv, mode_t mode)
{
        struct peer *pe = calloc(1, sizeof(*pe));
        if (pe == NULL)
                err(1, "malloc failed");
        pe->pe_name = name;
        pe->pe_serv = serv;
        pe->pe_mode = mode;
        STAILQ_INSERT_TAIL(&pqueue, pe, next);
}

static void
addsock(const char *name, const char *serv, mode_t mode)
{
        struct addrinfo hints = { }, *res, *res0;
        struct socklist *sl;
        int error;
        char *cp, *msgbuf;

        /*
         * We have to handle this case for backwards compatibility:
         * If there are two (or more) colons but no '[' and ']',
         * assume this is an inet6 address without a service.
         */
        if (name != NULL) {
#ifdef INET6
                if (name[0] == '[' &&
                    (cp = strchr(name + 1, ']')) != NULL) {
                        name = &name[1];
                        *cp = '\0';
                        if (cp[1] == ':' && cp[2] != '\0')
                                serv = cp + 2;
                } else {
#endif
                        cp = strchr(name, ':');
                        if (cp != NULL && strchr(cp + 1, ':') == NULL) {
                                *cp = '\0';
                                if (cp[1] != '\0')
                                        serv = cp + 1;
                                if (cp == name)
                                        name = NULL;
                        }
#ifdef INET6
                }
#endif
        }
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_DGRAM;
        hints.ai_flags = AI_PASSIVE;
        if (name != NULL)
                dprintf("Trying peer: %s\n", name);
        if (serv == NULL)
                serv = "syslog";
        error = getaddrinfo(name, serv, &hints, &res0);
        if (error == EAI_NONAME && name == NULL && SecureMode > 1) {
                /*
                 * If we're in secure mode, we won't open inet sockets anyway.
                 * This failure can arise legitimately when running in a jail
                 * without networking.
                 */
                return;
        }
        if (error) {
                asprintf(&msgbuf, "getaddrinfo failed for %s%s: %s",
                    name == NULL ? "" : name, serv,
                    gai_strerror(error));
                errno = 0;
                if (msgbuf == NULL)
                        logerror(gai_strerror(error));
                else
                        logerror(msgbuf);
                free(msgbuf);
                die(0);
        }
        for (res = res0; res != NULL; res = res->ai_next) {
                sl = socksetup(res, name, mode);
                if (sl == NULL)
                        continue;
                STAILQ_INSERT_TAIL(&shead, sl, next);
        }
        freeaddrinfo(res0);
}

static void
addfile(int fd)
{
        struct socklist *sl = calloc(1, sizeof(*sl));
        if (sl == NULL)
                err(1, "malloc failed");
        sl->sl_socket = fd;
        sl->sl_recv = socklist_recv_file;
        STAILQ_INSERT_TAIL(&shead, sl, next);
}

int
main(int argc, char *argv[])
{
        struct sigaction act = { };
        struct kevent ev;
        struct socklist *sl;
        pid_t spid;
        int ch, ppipe_w = -1, s;
        char *p;
        bool bflag = false, pflag = false, Sflag = false;

        if (madvise(NULL, 0, MADV_PROTECT) != 0)
                dprintf("madvise() failed: %s\n", strerror(errno));

        while ((ch = getopt(argc, argv, "468Aa:b:cCdf:FHkl:M:m:nNoO:p:P:sS:Tuv"))
            != -1)
                switch (ch) {
#ifdef INET
                case '4':
                        family = PF_INET;
                        break;
#endif
#ifdef INET6
                case '6':
                        family = PF_INET6;
                        break;
#endif
                case '8':
                        mask_C1 = 0;
                        break;
                case 'A':
                        send_to_all = true;
                        break;
                case 'a':               /* allow specific network addresses only */
                        if (!allowaddr(optarg))
                                usage();
                        break;
                case 'b':
                        bflag = true;
                        p = strchr(optarg, ']');
                        if (p != NULL)
                                p = strchr(p + 1, ':');
                        else {
                                p = strchr(optarg, ':');
                                if (p != NULL && strchr(p + 1, ':') != NULL)
                                        p = NULL; /* backward compatibility */
                        }
                        if (p == NULL) {
                                /* A hostname or filename only. */
                                addpeer(optarg, "syslog", 0);
                        } else {
                                /* The case of "name:service". */
                                *p++ = '\0';
                                addpeer(strlen(optarg) == 0 ? NULL : optarg,
                                    p, 0);
                        }
                        break;
                case 'c':
                        no_compress++;
                        break;
                case 'C':
                        logflags |= O_CREAT;
                        break;
                case 'd':               /* debug */
                        Debug = true;
                        break;
                case 'f':               /* configuration file */
                        ConfFile = optarg;
                        break;
                case 'F':               /* run in foreground instead of daemon */
                        Foreground = true;
                        break;
                case 'H':
                        RemoteHostname = true;
                        break;
                case 'k':               /* keep remote kern fac */
                        KeepKernFac = true;
                        break;
                case 'l':
                case 'p':
                case 'S':
                    {
                        long    perml;
                        mode_t  mode;
                        char    *name, *ep;

                        if (ch == 'l')
                                mode = DEFFILEMODE;
                        else if (ch == 'p') {
                                mode = DEFFILEMODE;
                                pflag = true;
                        } else {
                                mode = S_IRUSR | S_IWUSR;
                                Sflag = true;
                        }
                        if (optarg[0] == '/')
                                name = optarg;
                        else if ((name = strchr(optarg, ':')) != NULL) {
                                *name++ = '\0';
                                if (name[0] != '/')
                                        errx(1, "socket name must be absolute "
                                            "path");
                                if (isdigit(*optarg)) {
                                        perml = strtol(optarg, &ep, 8);
                                    if (*ep || perml < 0 ||
                                        perml & ~(S_IRWXU|S_IRWXG|S_IRWXO))
                                            errx(1, "invalid mode %s, exiting",
                                                optarg);
                                    mode = (mode_t )perml;
                                } else
                                        errx(1, "invalid mode %s, exiting",
                                            optarg);
                        } else
                                errx(1, "invalid filename %s, exiting",
                                    optarg);
                        addpeer(name, NULL, mode);
                        break;
                   }
                case 'M':               /* max length of forwarded message */
                        MaxForwardLen = atoi(optarg);
                        if (MaxForwardLen < 480)
                                errx(1, "minimum length limit of forwarded "
                                        "messages is 480 bytes");
                        break;
                case 'm':               /* mark interval */
                        MarkInterval = atoi(optarg) * 60;
                        break;
                case 'N':
                        NoBind = true;
                        if (!SecureMode)
                                SecureMode = 1;
                        break;
                case 'n':
                        resolve = false;
                        break;
                case 'O':
                        if (strcmp(optarg, "bsd") == 0 ||
                            strcmp(optarg, "rfc3164") == 0)
                                output_format = FORMAT_BSD_LEGACY;
                        else if (strcmp(optarg, "rfc3164-strict") == 0)
                                output_format = FORMAT_RFC3164_STRICT;
                        else if (strcmp(optarg, "syslog") == 0 ||
                            strcmp(optarg, "rfc5424") == 0)
                                output_format = FORMAT_RFC5424;
                        else
                                usage();
                        break;
                case 'o':
                        use_bootfile = true;
                        break;
                case 'P':               /* path for alt. PID */
                        PidFile = optarg;
                        break;
                case 's':               /* no network mode */
                        SecureMode++;
                        break;
                case 'T':
                        RemoteAddDate = true;
                        break;
                case 'u':               /* only log specified priority */
                        UniquePriority = true;
                        break;
                case 'v':               /* log facility and priority */
                        LogFacPri++;
                        break;
                default:
                        usage();
                }
        if ((argc -= optind) != 0)
                usage();

        if (IS_RFC3164_FORMAT && MaxForwardLen > 1024)
                errx(1, "RFC 3164 messages may not exceed 1024 bytes");

        pfh = pidfile_open(PidFile, 0600, &spid);
        if (pfh == NULL) {
                if (errno == EEXIST)
                        errx(1, "syslogd already running, pid: %d", spid);
                warn("cannot open pid file");
        }

        /*
         * Now that flags have been parsed, we know if we're in
         * secure mode. Add peers to the socklist, if allowed.
         */
        while (!STAILQ_EMPTY(&pqueue)) {
                struct peer *pe = STAILQ_FIRST(&pqueue);
                STAILQ_REMOVE_HEAD(&pqueue, next);
                addsock(pe->pe_name, pe->pe_serv, pe->pe_mode);
                free(pe);
        }
        /* Listen by default: /dev/klog. */
        s = open(_PATH_KLOG, O_RDONLY | O_NONBLOCK | O_CLOEXEC, 0);
        if (s < 0) {
                dprintf("can't open %s (%d)\n", _PATH_KLOG, errno);
        } else {
                addfile(s);
        }
        /* Listen by default: *:514 if no -b flag. */
        if (bflag == 0)
                addsock(NULL, "syslog", 0);
        /* Listen by default: /var/run/log if no -p flag. */
        if (pflag == 0)
                addsock(_PATH_LOG, NULL, DEFFILEMODE);
        /* Listen by default: /var/run/logpriv if no -S flag. */
        if (Sflag == 0)
                addsock(_PATH_LOG_PRIV, NULL, S_IRUSR | S_IWUSR);

        consfile.f_type = F_CONSOLE;
        consfile.f_file = -1;
        (void)strlcpy(consfile.f_fname, _PATH_CONSOLE + sizeof(_PATH_DEV) - 1,
            sizeof(consfile.f_fname));

        nulldesc = open(_PATH_DEVNULL, O_RDWR);
        if (nulldesc == -1) {
                warn("cannot open %s", _PATH_DEVNULL);
                pidfile_remove(pfh);
                exit(1);
        }

        (void)strlcpy(bootfile, getbootfile(), sizeof(bootfile));

        if (!Foreground && !Debug)
                ppipe_w = waitdaemon(30);
        else if (Debug)
                setlinebuf(stdout);

        kq = kqueue();
        if (kq == -1) {
                warn("failed to initialize kqueue");
                pidfile_remove(pfh);
                exit(1);
        }
        STAILQ_FOREACH(sl, &shead, next) {
                if (sl->sl_recv == NULL)
                        continue;
                EV_SET(&ev, sl->sl_socket, EVFILT_READ, EV_ADD, 0, 0, sl);
                if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) {
                        warn("failed to add kevent to kqueue");
                        pidfile_remove(pfh);
                        exit(1);
                }
        }

        /*
         * Syslogd will not reap its children via wait().
         * When SIGCHLD is ignored, zombie processes are
         * not created. A child's PID will be recycled
         * upon its exit.
         */
        act.sa_handler = SIG_IGN;
        for (size_t i = 0; i < nitems(sigcatch); ++i) {
                EV_SET(&ev, sigcatch[i], EVFILT_SIGNAL, EV_ADD, 0, 0, NULL);
                if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) {
                        warn("failed to add kevent to kqueue");
                        pidfile_remove(pfh);
                        exit(1);
                }
                if (sigaction(sigcatch[i], &act, NULL) == -1) {
                        warn("failed to apply signal handler");
                        pidfile_remove(pfh);
                        exit(1);
                }
        }
        (void)alarm(TIMERINTVL);

        /* tuck my process id away */
        pidfile_write(pfh);

        dprintf("off & running....\n");
        init(false);
        for (;;) {
                if (needdofsync) {
                        dofsync();
                        if (ppipe_w != -1) {
                                /*
                                 * Close our end of the pipe so our
                                 * parent knows that we have finished
                                 * initialization.
                                 */
                                (void)close(ppipe_w);
                                ppipe_w = -1;
                        }
                }
                if (kevent(kq, NULL, 0, &ev, 1, NULL) == -1) {
                        if (errno != EINTR)
                                logerror("kevent");
                        continue;
                }
                switch (ev.filter) {
                case EVFILT_READ:
                        sl = ev.udata;
                        if (sl->sl_socket != -1 && sl->sl_recv != NULL)
                                sl->sl_recv(sl);
                        break;
                case EVFILT_SIGNAL:
                        switch (ev.ident) {
                        case SIGHUP:
                                /* Reload */
                                init(true);
                                break;
                        case SIGINT:
                        case SIGQUIT:
                                /* Ignore these unless -F and / or -d */
                                if (!Foreground && !Debug)
                                        break;
                                /* FALLTHROUGH */
                        case SIGTERM:
                                /* Terminate */
                                die(ev.ident);
                                break;
                        case SIGALRM:
                                /* Mark and flush */
                                markit();
                                break;
                        }
                        break;
                case EVFILT_PROCDESC:
                        if ((ev.fflags & NOTE_EXIT) != 0) {
                                struct filed *f = ev.udata;

                                log_deadchild(f->f_procdesc, ev.data, f);
                                (void)close(f->f_procdesc);

                                f->f_procdesc = -1;
                                if (f->f_dq != NULL) {
                                        deadq_remove(f->f_dq);
                                        f->f_dq = NULL;
                                }

                                /*
                                 * If it is unused, then it was already closed.
                                 * Free the file data in this case.
                                 */
                                if (f->f_type == F_UNUSED)
                                        free(f);
                        }
                        break;
                }
        }
}

static int
socklist_recv_sock(struct socklist *sl)
{
        struct sockaddr_storage ss;
        struct sockaddr *sa = (struct sockaddr *)&ss;
        socklen_t sslen;
        const char *hname;
        char line[MAXLINE + 1];
        int len;

        sslen = sizeof(ss);
        len = recvfrom(sl->sl_socket, line, sizeof(line) - 1, 0, sa, &sslen);
        dprintf("received sa_len = %d\n", sslen);
        if (len == 0)
                return (-1);
        if (len < 0) {
                if (errno != EINTR)
                        logerror("recvfrom");
                return (-1);
        }
        /* Received valid data. */
        line[len] = '\0';
        if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL)
                hname = LocalHostName;
        else {
                hname = cvthname(sa);
                unmapped(sa);
                if (validate(sa, hname) == 0) {
                        dprintf("Message from %s was ignored.", hname);
                        return (-1);
                }
        }
        parsemsg(hname, line);

        return (0);
}

static void
unmapped(struct sockaddr *sa)
{
#if defined(INET) && defined(INET6)
        struct sockaddr_in6 *sin6;
        struct sockaddr_in sin;

        if (sa == NULL ||
            sa->sa_family != AF_INET6 ||
            sa->sa_len != sizeof(*sin6))
                return;
        sin6 = satosin6(sa);
        if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
                return;
        sin = (struct sockaddr_in){
                .sin_family = AF_INET,
                .sin_len = sizeof(sin),
                .sin_port = sin6->sin6_port
        };
        memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
            sizeof(sin.sin_addr));
        memcpy(sa, &sin, sizeof(sin));
#else
        if (sa == NULL)
                return;
#endif
}

static void
usage(void)
{

        fprintf(stderr,
                "usage: syslogd [-468ACcdFHknosTuv] [-a allowed_peer]\n"
                "               [-b bind_address] [-f config_file]\n"
                "               [-l [mode:]path] [-M fwd_length]\n"
                "               [-m mark_interval] [-O format] [-P pid_file]\n"
                "               [-p log_socket] [-S logpriv_socket]\n");
        exit(1);
}

/*
 * Removes characters from log messages that are unsafe to display.
 * TODO: Permit UTF-8 strings that include a BOM per RFC 5424?
 */
static void
parsemsg_remove_unsafe_characters(const char *in, char *out, size_t outlen)
{
        char *q;
        int c;

        q = out;
        while ((c = (unsigned char)*in++) != '\0' && q < out + outlen - 4) {
                if (mask_C1 && (c & 0x80) && c < 0xA0) {
                        c &= 0x7F;
                        *q++ = 'M';
                        *q++ = '-';
                }
                if (isascii(c) && iscntrl(c)) {
                        if (c == '\n') {
                                *q++ = ' ';
                        } else if (c == '\t') {
                                *q++ = '\t';
                        } else {
                                *q++ = '^';
                                *q++ = c ^ 0100;
                        }
                } else {
                        *q++ = c;
                }
        }
        *q = '\0';
}

/*
 * Parses a syslog message according to RFC 5424, assuming that PRI and
 * VERSION (i.e., "<%d>1 ") have already been parsed by parsemsg(). The
 * parsed result is passed to logmsg().
 */
static void
parsemsg_rfc5424(const char *from, int pri, char *msg)
{
        const struct logtime *timestamp;
        struct logtime timestamp_remote;
        const char *omsg, *hostname, *app_name, *procid, *msgid,
            *structured_data;
        char line[MAXLINE + 1];

#define FAIL_IF(field, expr) do {                                       \
        if (expr) {                                                     \
                dprintf("Failed to parse " field " from %s: %s\n",      \
                    from, omsg);                                        \
                return;                                                 \
        }                                                               \
} while (0)
#define PARSE_CHAR(field, sep) do {                                     \
        FAIL_IF(field, *msg != sep);                                    \
        ++msg;                                                          \
} while (0)
#define IF_NOT_NILVALUE(var)                                            \
        if (msg[0] == '-' && msg[1] == ' ') {                           \
                msg += 2;                                               \
                var = NULL;                                             \
        } else if (msg[0] == '-' && msg[1] == '\0') {                   \
                ++msg;                                                  \
                var = NULL;                                             \
        } else

        omsg = msg;
        IF_NOT_NILVALUE(timestamp) {
                /* Parse RFC 3339-like timestamp. */
#define PARSE_NUMBER(dest, length, min, max) do {                       \
        int i, v;                                                       \
                                                                        \
        v = 0;                                                          \
        for (i = 0; i < length; ++i) {                                  \
                FAIL_IF("TIMESTAMP", *msg < '0' || *msg > '9');         \
                v = v * 10 + *msg++ - '0';                              \
        }                                                               \
        FAIL_IF("TIMESTAMP", v < min || v > max);                       \
        dest = v;                                                       \
} while (0)
                /* Date and time. */
                memset(&timestamp_remote, 0, sizeof(timestamp_remote));
                PARSE_NUMBER(timestamp_remote.tm.tm_year, 4, 0, 9999);
                timestamp_remote.tm.tm_year -= 1900;
                PARSE_CHAR("TIMESTAMP", '-');
                PARSE_NUMBER(timestamp_remote.tm.tm_mon, 2, 1, 12);
                --timestamp_remote.tm.tm_mon;
                PARSE_CHAR("TIMESTAMP", '-');
                PARSE_NUMBER(timestamp_remote.tm.tm_mday, 2, 1, 31);
                PARSE_CHAR("TIMESTAMP", 'T');
                PARSE_NUMBER(timestamp_remote.tm.tm_hour, 2, 0, 23);
                PARSE_CHAR("TIMESTAMP", ':');
                PARSE_NUMBER(timestamp_remote.tm.tm_min, 2, 0, 59);
                PARSE_CHAR("TIMESTAMP", ':');
                PARSE_NUMBER(timestamp_remote.tm.tm_sec, 2, 0, 59);
                /* Perform normalization. */
                timegm(&timestamp_remote.tm);
                /* Optional: fractional seconds. */
                if (msg[0] == '.' && msg[1] >= '0' && msg[1] <= '9') {
                        int i;

                        ++msg;
                        for (i = 100000; i != 0; i /= 10) {
                                if (*msg < '0' || *msg > '9')
                                        break;
                                timestamp_remote.usec += (*msg++ - '0') * i;
                        }
                }
                /* Timezone. */
                if (*msg == 'Z') {
                        /* UTC. */
                        ++msg;
                } else {
                        int sign, tz_hour, tz_min;

                        /* Local time zone offset. */
                        FAIL_IF("TIMESTAMP", *msg != '-' && *msg != '+');
                        sign = *msg++ == '-' ? -1 : 1;
                        PARSE_NUMBER(tz_hour, 2, 0, 23);
                        PARSE_CHAR("TIMESTAMP", ':');
                        PARSE_NUMBER(tz_min, 2, 0, 59);
                        timestamp_remote.tm.tm_gmtoff =
                            sign * (tz_hour * 3600 + tz_min * 60);
                }
#undef PARSE_NUMBER
                PARSE_CHAR("TIMESTAMP", ' ');
                timestamp = RemoteAddDate ? NULL : &timestamp_remote;
        }

        /* String fields part of the HEADER. */
#define PARSE_STRING(field, var)                                        \
        IF_NOT_NILVALUE(var) {                                          \
                var = msg;                                              \
                while (*msg >= '!' && *msg <= '~')                      \
                        ++msg;                                          \
                FAIL_IF(field, var == msg);                             \
                PARSE_CHAR(field, ' ');                                 \
                msg[-1] = '\0';                                         \
        }
        PARSE_STRING("HOSTNAME", hostname);
        if (hostname == NULL || !RemoteHostname)
                hostname = from;
        PARSE_STRING("APP-NAME", app_name);
        PARSE_STRING("PROCID", procid);
        PARSE_STRING("MSGID", msgid);
#undef PARSE_STRING

        /* Structured data. */
#define PARSE_SD_NAME() do {                                            \
        const char *start;                                              \
                                                                        \
        start = msg;                                                    \
        while (*msg >= '!' && *msg <= '~' && *msg != '=' &&             \
            *msg != ']' && *msg != '"')                                 \
                ++msg;                                                  \
        FAIL_IF("STRUCTURED-NAME", start == msg);                       \
} while (0)
        IF_NOT_NILVALUE(structured_data) {
                structured_data = msg;
                /* SD-ELEMENT. */
                while (*msg == '[') {
                        ++msg;
                        /* SD-ID. */
                        PARSE_SD_NAME();
                        /* SD-PARAM. */
                        while (*msg == ' ') {
                                ++msg;
                                /* PARAM-NAME. */
                                PARSE_SD_NAME();
                                PARSE_CHAR("STRUCTURED-NAME", '=');
                                PARSE_CHAR("STRUCTURED-NAME", '"');
                                while (*msg != '"') {
                                        FAIL_IF("STRUCTURED-NAME",
                                            *msg == '\0');
                                        if (*msg++ == '\\') {
                                                FAIL_IF("STRUCTURED-NAME",
                                                    *msg == '\0');
                                                ++msg;
                                        }
                                }
                                ++msg;
                        }
                        PARSE_CHAR("STRUCTURED-NAME", ']');
                }
                PARSE_CHAR("STRUCTURED-NAME", ' ');
                msg[-1] = '\0';
        }
#undef PARSE_SD_NAME

#undef FAIL_IF
#undef PARSE_CHAR
#undef IF_NOT_NILVALUE

        parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
        logmsg(pri, timestamp, hostname, app_name, procid, msgid,
            structured_data, line, 0);
}

/*
 * Returns the length of the application name ("TAG" in RFC 3164
 * terminology) and process ID from a message if present.
 */
static void
parsemsg_rfc3164_get_app_name_procid(const char *msg, size_t *app_name_length_p,
    ptrdiff_t *procid_begin_offset_p, size_t *procid_length_p)
{
        const char *m, *procid_begin;
        size_t app_name_length, procid_length;

        m = msg;

        /* Application name. */
        app_name_length = strspn(m,
            "abcdefghijklmnopqrstuvwxyz"
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "0123456789"
            "_-/");
        if (app_name_length == 0)
                goto bad;
        m += app_name_length;

        /* Process identifier (optional). */
        if (*m == '[') {
                procid_begin = ++m;
                procid_length = strspn(m, "0123456789");
                if (procid_length == 0)
                        goto bad;
                m += procid_length;
                if (*m++ != ']')
                        goto bad;
        } else {
                procid_begin = NULL;
                procid_length = 0;
        }

        /* Separator. */
        if (m[0] != ':' || m[1] != ' ')
                goto bad;

        *app_name_length_p = app_name_length;
        if (procid_begin_offset_p != NULL)
                *procid_begin_offset_p =
                    procid_begin == NULL ? 0 : procid_begin - msg;
        if (procid_length_p != NULL)
                *procid_length_p = procid_length;
        return;
bad:
        *app_name_length_p = 0;
        if (procid_begin_offset_p != NULL)
                *procid_begin_offset_p = 0;
        if (procid_length_p != NULL)
                *procid_length_p = 0;
}

/*
 * Trims the application name ("TAG" in RFC 3164 terminology) and
 * process ID from a message if present.
 */
static void
parsemsg_rfc3164_app_name_procid(char **msg, const char **app_name,
    const char **procid)
{
        char *m, *app_name_begin, *procid_begin;
        size_t app_name_length, procid_length;
        ptrdiff_t procid_begin_offset;

        m = *msg;
        app_name_begin = m;

        parsemsg_rfc3164_get_app_name_procid(app_name_begin, &app_name_length,
            &procid_begin_offset, &procid_length);
        if (app_name_length == 0)
                goto bad;
        procid_begin = procid_begin_offset == 0 ? NULL :
            app_name_begin + procid_begin_offset;

        /* Split strings from input. */
        app_name_begin[app_name_length] = '\0';
        m += app_name_length;
        if (procid_begin != NULL) {
                procid_begin[procid_length] = '\0';
                /* Skip "[PID]". */
                m += procid_length + 2;
        }

        /* Skip separator ": ". */
        *msg = m + 2;
        *app_name = app_name_begin;
        *procid = procid_begin;
        return;
bad:
        *app_name = NULL;
        *procid = NULL;
}

/*
 * Parses a syslog message according to RFC 3164, assuming that PRI
 * (i.e., "<%d>") has already been parsed by parsemsg(). The parsed
 * result is passed to logmsg().
 */
static void
parsemsg_rfc3164(const char *from, int pri, char *msg)
{
        struct tm tm_parsed;
        const struct logtime *timestamp;
        struct logtime timestamp_remote;
        const char *app_name, *procid;
        size_t i, msglen;
        char line[MAXLINE + 1];

        /*
         * Parse the TIMESTAMP provided by the remote side. If none is
         * found, assume this is not an RFC 3164 formatted message,
         * only containing a TAG and a MSG.
         */
        timestamp = NULL;
        if (strptime(msg, RFC3164_DATEFMT, &tm_parsed) ==
            msg + RFC3164_DATELEN && msg[RFC3164_DATELEN] == ' ') {
                msg += RFC3164_DATELEN + 1;
                if (!RemoteAddDate) {
                        struct tm tm_now;
                        time_t t_now;
                        int year;

                        /*
                         * As the timestamp does not contain the year
                         * number, daylight saving time information, nor
                         * a time zone, attempt to infer it. Due to
                         * clock skews, the timestamp may even be part
                         * of the next year. Use the last year for which
                         * the timestamp is at most one week in the
                         * future.
                         *
                         * This loop can only run for at most three
                         * iterations before terminating.
                         */
                        t_now = time(NULL);
                        localtime_r(&t_now, &tm_now);
                        for (year = tm_now.tm_year + 1;; --year) {
                                assert(year >= tm_now.tm_year - 1);
                                timestamp_remote.tm = tm_parsed;
                                timestamp_remote.tm.tm_year = year;
                                timestamp_remote.tm.tm_isdst = -1;
                                timestamp_remote.usec = 0;
                                if (mktime(&timestamp_remote.tm) <
                                    t_now + 7 * 24 * 60 * 60)
                                        break;
                        }
                        timestamp = &timestamp_remote;
                }

                /*
                 * A single space character MUST also follow the HOSTNAME field.
                 */
                msglen = strlen(msg);
                for (i = 0; i < MIN(MAXHOSTNAMELEN, msglen); i++) {
                        if (msg[i] == ' ') {
                                if (RemoteHostname) {
                                        msg[i] = '\0';
                                        from = msg;
                                }
                                msg += i + 1;
                                break;
                        }
                        /*
                         * Support non RFC compliant messages, without hostname.
                         */
                        if (msg[i] == ':')
                                break;
                }
                if (i == MIN(MAXHOSTNAMELEN, msglen)) {
                        dprintf("Invalid HOSTNAME from %s: %s\n", from, msg);
                        return;
                }
        }

        /* Remove the TAG, if present. */
        parsemsg_rfc3164_app_name_procid(&msg, &app_name, &procid);
        parsemsg_remove_unsafe_characters(msg, line, sizeof(line));
        logmsg(pri, timestamp, from, app_name, procid, NULL, NULL, line, 0);
}

/*
 * Takes a raw input line, extracts PRI and determines whether the
 * message is formatted according to RFC 3164 or RFC 5424. Continues
 * parsing of addition fields in the message according to those
 * standards and prints the message on the appropriate log files.
 */
static void
parsemsg(const char *from, char *msg)
{
        char *q;
        long n;
        size_t i;
        int pri;

        i = -1;
        pri = DEFUPRI;

        /* Parse PRI. */
        if (msg[0] == '<' && isdigit(msg[1])) {
            for (i = 2; i <= 4; i++) {
                if (msg[i] == '>') {
                    errno = 0;
                    n = strtol(msg + 1, &q, 10);
                    if (errno == 0 && *q == msg[i] && n >= 0 && n <= INT_MAX) {
                        pri = n;
                        msg += i + 1;
                        i = 0;
                    }
                    break;
                }
            }
        }

        if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
                pri = DEFUPRI;

        /*
         * Don't allow users to log kernel messages.
         * NOTE: since LOG_KERN == 0 this will also match
         *       messages with no facility specified.
         */
        if ((pri & LOG_FACMASK) == LOG_KERN && !KeepKernFac)
                pri = LOG_MAKEPRI(LOG_USER, LOG_PRI(pri));

        /* Parse VERSION. */
        if (i == 0 && msg[0] == '1' && msg[1] == ' ')
                parsemsg_rfc5424(from, pri, msg + 2);
        else
                parsemsg_rfc3164(from, pri, msg);
}

/*
 * Read /dev/klog while data are available, split into lines.
 */
static int
socklist_recv_file(struct socklist *sl)
{
        char *p, *q, line[MAXLINE + 1];
        int len, i;

        len = 0;
        for (;;) {
                i = read(sl->sl_socket, line + len, MAXLINE - 1 - len);
                if (i > 0) {
                        line[i + len] = '\0';
                } else {
                        if (i < 0 && errno != EINTR && errno != EAGAIN) {
                                logerror("klog");
                                close(sl->sl_socket);
                                sl->sl_socket = -1;
                        }
                        break;
                }

                for (p = line; (q = strchr(p, '\n')) != NULL; p = q + 1) {
                        *q = '\0';
                        printsys(p);
                }
                len = strlen(p);
                if (len >= MAXLINE - 1) {
                        printsys(p);
                        len = 0;
                }
                if (len > 0)
                        memmove(line, p, len + 1);
        }
        if (len > 0)
                printsys(line);

        return (len);
}

/*
 * Take a raw input line from /dev/klog, format similar to syslog().
 */
static void
printsys(char *msg)
{
        char *p, *q;
        long n;
        int flags, isprintf, pri;

        flags = ISKERNEL | SYNC_FILE;   /* fsync after write */
        p = msg;
        pri = DEFSPRI;
        isprintf = 1;
        if (*p == '<') {
                errno = 0;
                n = strtol(p + 1, &q, 10);
                if (*q == '>' && n >= 0 && n < INT_MAX && errno == 0) {
                        p = q + 1;
                        pri = n;
                        isprintf = 0;
                }
        }
        /*
         * Kernel printf's and LOG_CONSOLE messages have been displayed
         * on the console already.
         */
        if (isprintf || (pri & LOG_FACMASK) == LOG_CONSOLE)
                flags |= IGN_CONS;
        if (pri &~ (LOG_FACMASK|LOG_PRIMASK))
                pri = DEFSPRI;
        logmsg(pri, NULL, LocalHostName, "kernel", NULL, NULL, NULL, p, flags);
}

static time_t   now;

/*
 * Match a program or host name against a specification.
 * Return a non-0 value if the message must be ignored
 * based on the specification.
 */
static int
skip_message(const char *name, const char *spec, int checkcase)
{
        const char *s;
        char prev, next;
        int exclude = 0;
        /* Behaviour on explicit match */

        if (spec == NULL || *spec == '\0')
                return (0);
        switch (*spec) {
        case '-':
                exclude = 1;
                /*FALLTHROUGH*/
        case '+':
                spec++;
                break;
        default:
                break;
        }
        if (checkcase)
                s = strstr (spec, name);
        else
                s = strcasestr (spec, name);

        if (s != NULL) {
                prev = (s == spec ? ',' : *(s - 1));
                next = *(s + strlen (name));

                if (prev == ',' && (next == '\0' || next == ','))
                        /* Explicit match: skip iff the spec is an
                           exclusive one. */
                        return (exclude);
        }

        /* No explicit match for this name: skip the message iff
           the spec is an inclusive one. */
        return (!exclude);
}

/*
 * Match some property of the message against a filter.
 * Return a non-0 value if the message must be ignored
 * based on the filter.
 */
static int
evaluate_prop_filter(const struct prop_filter *filter, const char *value)
{
        const char *s = NULL;
        const int exclude = ((filter->cmp_flags & FILT_FLAG_EXCLUDE) > 0);
        size_t valuelen;

        if (value == NULL)
                return (-1);

        if (filter->cmp_type == FILT_CMP_REGEX) {
                if (regexec(filter->pflt_re, value, 0, NULL, 0) == 0)
                        return (exclude);
                else
                        return (!exclude);
        }

        valuelen = strlen(value);

        /* a shortcut for equal with different length is always false */
        if (filter->cmp_type == FILT_CMP_EQUAL &&
            valuelen != strlen(filter->pflt_strval))
                return (!exclude);

        if (filter->cmp_flags & FILT_FLAG_ICASE)
                s = strcasestr(value, filter->pflt_strval);
        else
                s = strstr(value, filter->pflt_strval);

        /*
         * FILT_CMP_CONTAINS    true if s
         * FILT_CMP_STARTS      true if s && s == value
         * FILT_CMP_EQUAL       true if s && s == value &&
         *                          valuelen == filter->pflt_strlen
         *                          (and length match is checked
         *                           already)
         */

        switch (filter->cmp_type) {
        case FILT_CMP_STARTS:
        case FILT_CMP_EQUAL:
                if (s != value)
                        return (!exclude);
        /* FALLTHROUGH */
        case FILT_CMP_CONTAINS:
                if (s)
                        return (exclude);
                else
                        return (!exclude);
                break;
        default:
                /* unknown cmp_type */
                break;
        }

        return (-1);
}

/*
 * Logs a message to the appropriate log files, users, etc. based on the
 * priority. Log messages are formatted according to RFC 3164 or
 * RFC 5424 in subsequent fprintlog_*() functions.
 */
static void
logmsg(int pri, const struct logtime *timestamp, const char *hostname,
    const char *app_name, const char *procid, const char *msgid,
    const char *structured_data, const char *msg, int flags)
{
        struct timeval tv;
        struct logtime timestamp_now;
        struct filed *f;
        size_t savedlen;
        int fac, prilev;
        char saved[MAXSVLINE], kernel_app_name[100];

        dprintf("logmsg: pri %o, flags %x, from %s, msg %s\n",
            pri, flags, hostname, msg);

        (void)gettimeofday(&tv, NULL);
        now = tv.tv_sec;
        if (timestamp == NULL) {
                localtime_r(&now, &timestamp_now.tm);
                timestamp_now.usec = tv.tv_usec;
                timestamp = &timestamp_now;
        }

        /* extract facility and priority level */
        if (flags & MARK)
                fac = LOG_NFACILITIES;
        else
                fac = LOG_FAC(pri);

        /* Check maximum facility number. */
        if (fac > LOG_NFACILITIES)
                return;

        prilev = LOG_PRI(pri);

        /*
         * Lookup kernel app name from log prefix if present.
         * This is only used for local program specification matching.
         */
        if (flags & ISKERNEL) {
                size_t kernel_app_name_length;

                parsemsg_rfc3164_get_app_name_procid(msg,
                    &kernel_app_name_length, NULL, NULL);
                if (kernel_app_name_length != 0) {
                        strlcpy(kernel_app_name, msg,
                            MIN(sizeof(kernel_app_name),
                            kernel_app_name_length + 1));
                } else
                        kernel_app_name[0] = '\0';
        }

        /* log the message to the particular outputs */
        if (!Initialized) {
                consfile.f_lasttime = *timestamp;
                fprintlog_first(&consfile, hostname, app_name, procid,
                    msgid, structured_data, msg, flags);
                return;
        }

        /*
         * Store all of the fields of the message, except the timestamp,
         * in a single string. This string is used to detect duplicate
         * messages.
         */
        assert(hostname != NULL);
        assert(msg != NULL);
        savedlen = snprintf(saved, sizeof(saved),
            "%d %s %s %s %s %s %s", pri, hostname,
            app_name == NULL ? "-" : app_name, procid == NULL ? "-" : procid,
            msgid == NULL ? "-" : msgid,
            structured_data == NULL ? "-" : structured_data, msg);

        STAILQ_FOREACH(f, &fhead, next) {
                /* skip messages that are incorrect priority */
                if (!(((f->f_pcmp[fac] & PRI_EQ) && (f->f_pmask[fac] == prilev))
                     ||((f->f_pcmp[fac] & PRI_LT) && (f->f_pmask[fac] < prilev))
                     ||((f->f_pcmp[fac] & PRI_GT) && (f->f_pmask[fac] > prilev))
                     )
                    || f->f_pmask[fac] == INTERNAL_NOPRI)
                        continue;

                /* skip messages with the incorrect hostname */
                if (skip_message(hostname, f->f_host, 0))
                        continue;

                /* skip messages with the incorrect program name */
                if (flags & ISKERNEL && kernel_app_name[0] != '\0') {
                        if (skip_message(kernel_app_name, f->f_program, 1))
                                continue;
                } else if (skip_message(app_name == NULL ? "" : app_name,
                    f->f_program, 1))
                        continue;

                /* skip messages if a property does not match filter */
                if (f->f_prop_filter != NULL &&
                    f->f_prop_filter->prop_type != FILT_PROP_NOOP) {
                        switch (f->f_prop_filter->prop_type) {
                        case FILT_PROP_MSG:
                                if (evaluate_prop_filter(f->f_prop_filter,
                                    msg))
                                        continue;
                                break;
                        case FILT_PROP_HOSTNAME:
                                if (evaluate_prop_filter(f->f_prop_filter,
                                    hostname))
                                        continue;
                                break;
                        case FILT_PROP_PROGNAME:
                                if (evaluate_prop_filter(f->f_prop_filter,
                                    app_name == NULL ? "" : app_name))
                                        continue;
                                break;
                        default:
                                continue;
                        }
                }

                /* skip message to console if it has already been printed */
                if (f->f_type == F_CONSOLE && (flags & IGN_CONS))
                        continue;

                /* don't output marks to recently written files */
                if ((flags & MARK) && (now - f->f_time) < MarkInterval / 2)
                        continue;

                /*
                 * suppress duplicate lines to this file
                 */
                if (no_compress - (f->f_type != F_PIPE) < 1 &&
                    (flags & MARK) == 0 && savedlen == f->f_prevlen &&
                    strcmp(saved, f->f_prevline) == 0) {
                        f->f_lasttime = *timestamp;
                        f->f_prevcount++;
                        dprintf("msg repeated %d times, %ld sec of %d\n",
                            f->f_prevcount, (long)(now - f->f_time),
                            repeatinterval[f->f_repeatcount]);
                        /*
                         * If domark would have logged this by now,
                         * flush it now (so we don't hold isolated messages),
                         * but back off so we'll flush less often
                         * in the future.
                         */
                        if (now > REPEATTIME(f)) {
                                fprintlog_successive(f, flags);
                                BACKOFF(f);
                        }
                } else {
                        /* new line, save it */
                        if (f->f_prevcount)
                                fprintlog_successive(f, 0);
                        f->f_repeatcount = 0;
                        f->f_prevpri = pri;
                        f->f_lasttime = *timestamp;
                        static_assert(sizeof(f->f_prevline) == sizeof(saved),
                            "Space to store saved line incorrect");
                        (void)strcpy(f->f_prevline, saved);
                        f->f_prevlen = savedlen;
                        fprintlog_first(f, hostname, app_name, procid, msgid,
                            structured_data, msg, flags);
                }
        }
}

static void
dofsync(void)
{
        struct filed *f;

        STAILQ_FOREACH(f, &fhead, next) {
                if (f->f_type == F_FILE &&
                    (f->f_flags & FFLAG_NEEDSYNC) != 0) {
                        f->f_flags &= ~FFLAG_NEEDSYNC;
                        (void)fsync(f->f_file);
                }
        }
        needdofsync = false;
}

static void
iovlist_init(struct iovlist *il)
{

        il->iovcnt = 0;
        il->totalsize = 0;
}

static void
iovlist_append(struct iovlist *il, const char *str)
{
        size_t size;

        /* Discard components if we've run out of iovecs. */
        if (il->iovcnt < nitems(il->iov)) {
                size = strlen(str);
                il->iov[il->iovcnt++] = (struct iovec){
                        .iov_base       = __DECONST(char *, str),
                        .iov_len        = size,
                };
                il->totalsize += size;
        }
}

#if defined(INET) || defined(INET6)
static void
iovlist_truncate(struct iovlist *il, size_t size)
{
        struct iovec *last;
        size_t diff;

        while (il->totalsize > size) {
                diff = il->totalsize - size;
                last = &il->iov[il->iovcnt - 1];
                if (diff >= last->iov_len) {
                        /* Remove the last iovec entirely. */
                        --il->iovcnt;
                        il->totalsize -= last->iov_len;
                } else {
                        /* Remove the last iovec partially. */
                        last->iov_len -= diff;
                        il->totalsize -= diff;
                }
        }
}
#endif

static void
fprintlog_write(struct filed *f, struct iovlist *il, int flags)
{
        const char *msgret;

        switch (f->f_type) {
        case F_FORW: {
                ssize_t lsent;

                if (Debug) {
                        int domain, sockfd = f->f_addr_fds[0];
                        socklen_t len = sizeof(domain);

                        if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN,
                            &domain, &len) < 0)
                                err(1, "getsockopt");

                        printf(" %s", f->f_hname);
                        switch (domain) {
#ifdef INET
                        case AF_INET: {
                                struct sockaddr_in sin;

                                len = sizeof(sin);
                                if (getpeername(sockfd,
                                    (struct sockaddr *)&sin, &len) < 0)
                                        err(1, "getpeername");
                                printf(":%d\n", ntohs(sin.sin_port));
                                break;
                        }
#endif
#ifdef INET6
                        case AF_INET6: {
                                struct sockaddr_in6 sin6;

                                len = sizeof(sin6);
                                if (getpeername(sockfd,
                                    (struct sockaddr *)&sin6, &len) < 0)
                                        err(1, "getpeername");
                                printf(":%d\n", ntohs(sin6.sin6_port));
                                break;
                        }
#endif
                        default:
                                printf("\n");
                        }
                }

#if defined(INET) || defined(INET6)
                /* Truncate messages to maximum forward length. */
                iovlist_truncate(il, MaxForwardLen);
#endif

                lsent = 0;
                for (size_t i = 0; i < f->f_num_addr_fds; ++i) {
                        struct msghdr msg = {
                                .msg_iov = il->iov,
                                .msg_iovlen = il->iovcnt,
                        };

                        lsent = sendmsg(f->f_addr_fds[i], &msg, 0);
                        if (lsent == (ssize_t)il->totalsize && !send_to_all)
                                break;
                }
                dprintf("lsent/totalsize: %zd/%zu\n", lsent, il->totalsize);
                if (lsent != (ssize_t)il->totalsize) {
                        int e = errno;
                        logerror("sendto");
                        errno = e;
                        switch (errno) {
                        case ENOBUFS:
                        case ENETDOWN:
                        case ENETUNREACH:
                        case EHOSTUNREACH:
                        case EHOSTDOWN:
                        case EADDRNOTAVAIL:
                        case EAGAIN:
                        case ECONNREFUSED:
                                break;
                        /* case EBADF: */
                        /* case EACCES: */
                        /* case ENOTSOCK: */
                        /* case EFAULT: */
                        /* case EMSGSIZE: */
                        default:
                                dprintf("removing entry: errno=%d\n", e);
                                f->f_type = F_UNUSED;
                                break;
                        }
                }
                break;
        }

        case F_FILE:
                dprintf(" %s\n", f->f_fname);
                iovlist_append(il, "\n");
                if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
                        /*
                         * If writev(2) fails for potentially transient errors
                         * like the filesystem being full, ignore it.
                         * Otherwise remove this logfile from the list.
                         */
                        if (errno != ENOSPC) {
                                int e = errno;
                                close_filed(f);
                                errno = e;
                                logerror(f->f_fname);
                        }
                } else if ((flags & SYNC_FILE) && (f->f_flags & FFLAG_SYNC)) {
                        f->f_flags |= FFLAG_NEEDSYNC;
                        needdofsync = true;
                }
                break;

        case F_PIPE:
                dprintf(" %s\n", f->f_pname);
                iovlist_append(il, "\n");
                if (f->f_procdesc == -1) {
                        struct kevent ev;
                        struct filed *f_in_list;
                        size_t i = 0;

                        STAILQ_FOREACH(f_in_list, &fhead, next) {
                                if (f_in_list == f)
                                        break;
                                ++i;
                        }
                        f->f_file = cap_p_open(cap_syslogd, i, f->f_pname,
                            &f->f_procdesc);
                        if (f->f_file < 0) {
                                logerror(f->f_pname);
                                break;
                        }
                        EV_SET(&ev, f->f_procdesc, EVFILT_PROCDESC, EV_ADD,
                            NOTE_EXIT, 0, f);
                        if (kevent(kq, &ev, 1, NULL, 0, NULL) == -1) {
                                logerror("failed to add procdesc kevent");
                                exit(1);
                        }
                }
                if (writev(f->f_file, il->iov, il->iovcnt) < 0) {
                        logerror(f->f_pname);
                        f->f_dq = deadq_enter(f->f_procdesc);
                }
                break;

        case F_CONSOLE:
                if (flags & IGN_CONS) {
                        dprintf(" (ignored)\n");
                        break;
                }
                /* FALLTHROUGH */

        case F_TTY:
                dprintf(" %s%s\n", _PATH_DEV, f->f_fname);
                iovlist_append(il, "\r\n");
                errno = 0;      /* ttymsg() only sometimes returns an errno */
                if ((msgret = cap_ttymsg(cap_syslogd, il->iov, il->iovcnt,
                    f->f_fname, 10))) {
                        f->f_type = F_UNUSED;
                        logerror(msgret);
                }
                break;

        case F_USERS:
        case F_WALL:
                dprintf("\n");
                iovlist_append(il, "\r\n");
                cap_wallmsg(cap_syslogd, f, il->iov, il->iovcnt);
                break;
        default:
                break;
        }
}

static void
fprintlog_rfc5424(struct filed *f, const char *hostname, const char *app_name,
    const char *procid, const char *msgid, const char *structured_data,
    const char *msg, int flags)
{
        struct iovlist il;
        suseconds_t usec;
        int i;
        char timebuf[33], priority_number[5];

        iovlist_init(&il);
        if (f->f_type == F_WALL)
                iovlist_append(&il, "\r\n\aMessage from syslogd ...\r\n");
        iovlist_append(&il, "<");
        snprintf(priority_number, sizeof(priority_number), "%d", f->f_prevpri);
        iovlist_append(&il, priority_number);
        iovlist_append(&il, ">1 ");
        if (strftime(timebuf, sizeof(timebuf), "%FT%T.______%z",
            &f->f_lasttime.tm) == sizeof(timebuf) - 2) {
                /* Add colon to the time zone offset, which %z doesn't do. */
                timebuf[32] = '\0';
                timebuf[31] = timebuf[30];
                timebuf[30] = timebuf[29];
                timebuf[29] = ':';

                /* Overwrite space for microseconds with actual value. */
                usec = f->f_lasttime.usec;
                for (i = 25; i >= 20; --i) {
                        timebuf[i] = usec % 10 + '0';
                        usec /= 10;
                }
                iovlist_append(&il, timebuf);
        } else
                iovlist_append(&il, "-");
        iovlist_append(&il, " ");
        iovlist_append(&il, hostname);
        iovlist_append(&il, " ");
        iovlist_append(&il, app_name == NULL ? "-" : app_name);
        iovlist_append(&il, " ");
        iovlist_append(&il, procid == NULL ? "-" : procid);
        iovlist_append(&il, " ");
        iovlist_append(&il, msgid == NULL ? "-" : msgid);
        iovlist_append(&il, " ");
        iovlist_append(&il, structured_data == NULL ? "-" : structured_data);
        iovlist_append(&il, " ");
        iovlist_append(&il, msg);

        fprintlog_write(f, &il, flags);
}

static void
fprintlog_rfc3164(struct filed *f, const char *hostname, const char *app_name,
    const char *procid, const char *msg, int flags)
{
        struct iovlist il;
        const CODE *c;
        int facility, priority;
        char timebuf[RFC3164_DATELEN + 1], facility_number[5],
            priority_number[5];
        bool facility_found, priority_found;

        if (strftime(timebuf, sizeof(timebuf), RFC3164_DATEFMT,
            &f->f_lasttime.tm) == 0)
                timebuf[0] = '\0';

        iovlist_init(&il);
        switch (f->f_type) {
        case F_FORW:
                /* Message forwarded over the network. */
                iovlist_append(&il, "<");
                snprintf(priority_number, sizeof(priority_number), "%d",
                    f->f_prevpri);
                iovlist_append(&il, priority_number);
                iovlist_append(&il, ">");
                iovlist_append(&il, timebuf);
                if (output_format == FORMAT_RFC3164_STRICT) {
                        iovlist_append(&il, " ");
                        iovlist_append(&il, hostname);
                } else if (strcasecmp(hostname, LocalHostName) != 0) {
                        iovlist_append(&il, " Forwarded from ");
                        iovlist_append(&il, hostname);
                        iovlist_append(&il, ":");
                }
                iovlist_append(&il, " ");
                break;

        case F_WALL:
                /* Message written to terminals. */
                iovlist_append(&il, "\r\n\aMessage from syslogd@");
                iovlist_append(&il, hostname);
                iovlist_append(&il, " at ");
                iovlist_append(&il, timebuf);
                iovlist_append(&il, " ...\r\n");
                break;

        default:
                /* Message written to files. */
                iovlist_append(&il, timebuf);
                iovlist_append(&il, " ");

                if (LogFacPri) {
                        iovlist_append(&il, "<");

                        facility = f->f_prevpri & LOG_FACMASK;
                        facility_found = false;
                        if (LogFacPri > 1) {
                                for (c = facilitynames; c->c_name; c++) {
                                        if (c->c_val == facility) {
                                                iovlist_append(&il, c->c_name);
                                                facility_found = true;
                                                break;
                                        }
                                }
                        }
                        if (!facility_found) {
                                snprintf(facility_number,
                                    sizeof(facility_number), "%d",
                                    LOG_FAC(facility));
                                iovlist_append(&il, facility_number);
                        }

                        iovlist_append(&il, ".");

                        priority = LOG_PRI(f->f_prevpri);
                        priority_found = false;
                        if (LogFacPri > 1) {
                                for (c = prioritynames; c->c_name; c++) {
                                        if (c->c_val == priority) {
                                                iovlist_append(&il, c->c_name);
                                                priority_found = true;
                                                break;
                                        }
                                }
                        }
                        if (!priority_found) {
                                snprintf(priority_number,
                                    sizeof(priority_number), "%d", priority);
                                iovlist_append(&il, priority_number);
                        }

                        iovlist_append(&il, "> ");
                }

                iovlist_append(&il, hostname);
                iovlist_append(&il, " ");
                break;
        }

        /* Message body with application name and process ID prefixed. */
        if (app_name != NULL) {
                iovlist_append(&il, app_name);
                if (procid != NULL) {
                        iovlist_append(&il, "[");
                        iovlist_append(&il, procid);
                        iovlist_append(&il, "]");
                }
                iovlist_append(&il, ": ");
        }
        iovlist_append(&il, msg);

        fprintlog_write(f, &il, flags);
}

static void
fprintlog_first(struct filed *f, const char *hostname, const char *app_name,
    const char *procid, const char *msgid __unused,
    const char *structured_data __unused, const char *msg, int flags)
{

        dprintf("Logging to %s", TypeNames[f->f_type]);
        f->f_time = now;
        f->f_prevcount = 0;
        if (f->f_type == F_UNUSED) {
                dprintf("\n");
                return;
        }

        if (IS_RFC3164_FORMAT)
                fprintlog_rfc3164(f, hostname, app_name, procid, msg, flags);
        else
                fprintlog_rfc5424(f, hostname, app_name, procid, msgid,
                    structured_data, msg, flags);
}

/*
 * Prints a message to a log file that the previously logged message was
 * received multiple times.
 */
static void
fprintlog_successive(struct filed *f, int flags)
{
        char msg[100];

        assert(f->f_prevcount > 0);
        snprintf(msg, sizeof(msg), "last message repeated %d times",
            f->f_prevcount);
        fprintlog_first(f, LocalHostName, "syslogd", NULL, NULL, NULL, msg,
            flags);
}

/*
 *  WALLMSG -- Write a message to the world at large
 *
 *      Write the specified message to either the entire
 *      world, or a list of approved users.
 *
 * Note: This function is wrapped by cap_wallmsg() when Capsicum support is
 * enabled so ttymsg() can be called.
 */
void
wallmsg(const struct filed *f, struct iovec *iov, const int iovlen)
{
        static int reenter;                     /* avoid calling ourselves */
        struct utmpx *ut;
        int i;
        const char *p;

        if (reenter++)
                return;
        setutxent();
        /* NOSTRICT */
        while ((ut = getutxent()) != NULL) {
                if (ut->ut_type != USER_PROCESS)
                        continue;
                if (f->f_type == F_WALL) {
                        if ((p = ttymsg(iov, iovlen, ut->ut_line,
                            TTYMSGTIME)) != NULL)
                                dprintf("%s\n", p);
                        continue;
                }
                /* should we send the message to this user? */
                for (i = 0; i < MAXUNAMES; i++) {
                        if (!f->f_uname[i][0])
                                break;
                        if (!strcmp(f->f_uname[i], ut->ut_user)) {
                                if ((p = ttymsg_check(iov, iovlen, ut->ut_line,
                                    TTYMSGTIME)) != NULL)
                                        dprintf("%s\n", p);
                                break;
                        }
                }
        }
        endutxent();
        reenter = 0;
}

/*
 * Wrapper routine for ttymsg() that checks the terminal for messages enabled.
 */
static const char *
ttymsg_check(struct iovec *iov, int iovcnt, char *line, int tmout)
{
        static char device[1024];
        static char errbuf[1024];
        struct stat sb;

        (void) snprintf(device, sizeof(device), "%s%s", _PATH_DEV, line);

        if (stat(device, &sb) < 0) {
                (void) snprintf(errbuf, sizeof(errbuf),
                    "%s: %s", device, strerror(errno));
                return (errbuf);
        }
        if ((sb.st_mode & S_IWGRP) == 0)
                /* Messages disabled. */
                return (NULL);
        return (ttymsg(iov, iovcnt, line, tmout));
}

/*
 * Return a printable representation of a host address.
 */
static const char *
cvthname(struct sockaddr *f)
{
        int error, hl;
        static char hname[NI_MAXHOST], ip[NI_MAXHOST];

        dprintf("cvthname(%d) len = %d\n", f->sa_family, f->sa_len);
        error = cap_getnameinfo(cap_net, f, f->sa_len, ip, sizeof(ip), NULL, 0,
                    NI_NUMERICHOST);
        if (error) {
                dprintf("Malformed from address %s\n", gai_strerror(error));
                return ("???");
        }
        dprintf("cvthname(%s)\n", ip);

        if (!resolve)
                return (ip);

        error = cap_getnameinfo(cap_net, f, f->sa_len, hname, sizeof(hname),
                    NULL, 0, NI_NAMEREQD);
        if (error) {
                dprintf("Host name for your address (%s) unknown\n", ip);
                return (ip);
        }
        hl = strlen(hname);
        if (hl > 0 && hname[hl-1] == '.')
                hname[--hl] = '\0';
        /* RFC 5424 prefers logging FQDNs. */
        if (IS_RFC3164_FORMAT)
                trimdomain(hname, hl);
        return (hname);
}

/*
 * Print syslogd errors some place.
 */
void
logerror(const char *msg)
{
        char buf[512];
        static int recursed = 0;

        /* If there's an error while trying to log an error, give up. */
        if (recursed)
                return;
        recursed++;
        if (errno != 0) {
                (void)snprintf(buf, sizeof(buf), "%s: %s", msg,
                    strerror(errno));
                msg = buf;
        }
        errno = 0;
        dprintf("%s\n", msg);
        logmsg(LOG_SYSLOG|LOG_ERR, NULL, LocalHostName, "syslogd", NULL, NULL,
            NULL, msg, 0);
        recursed--;
}

static void
die(int signo)
{
        struct filed *f;
        struct socklist *sl;
        char buf[100];

        STAILQ_FOREACH(f, &fhead, next) {
                /* flush any pending output */
                if (f->f_prevcount)
                        fprintlog_successive(f, 0);
        }
        if (signo) {
                dprintf("syslogd: exiting on signal %d\n", signo);
                (void)snprintf(buf, sizeof(buf), "exiting on signal %d", signo);
                errno = 0;
                logerror(buf);
        }
        STAILQ_FOREACH(sl, &shead, next) {
                if (sl->sl_sa != NULL && sl->sl_family == AF_LOCAL) {
                        if (unlinkat(sl->sl_dirfd, sl->sl_name, 0) == -1) {
                                dprintf("Failed to unlink %s: %s", sl->sl_name,
                                    strerror(errno));
                        }
                }
        }
        pidfile_remove(pfh);

        exit(1);
}

static int
configfiles(const struct dirent *dp)
{
        const char *p;
        size_t ext_len;

        if (dp->d_name[0] == '.')
                return (0);

        ext_len = sizeof(include_ext) -1;

        if (dp->d_namlen <= ext_len)
                return (0);

        p = &dp->d_name[dp->d_namlen - ext_len];
        if (strcmp(p, include_ext) != 0)
                return (0);

        return (1);
}

static nvlist_t *
parseconfigfile(FILE *cf, bool allow_includes, nvlist_t *nvl_conf)
{
        FILE *cf2;
        struct dirent **ent;
        char cline[LINE_MAX];
        char host[MAXHOSTNAMELEN];
        char prog[LINE_MAX];
        char file[MAXPATHLEN];
        char pfilter[LINE_MAX];
        char *p, *tmp;
        int i, nents;
        size_t include_len;

        /*
         *  Foreach line in the conf table, open that file.
         */
        include_len = sizeof(include_str) - 1;
        (void)strlcpy(host, "*", sizeof(host));
        (void)strlcpy(prog, "*", sizeof(prog));
        (void)strlcpy(pfilter, "*", sizeof(pfilter));
        while (fgets(cline, sizeof(cline), cf) != NULL) {
                /*
                 * check for end-of-section, comments, strip off trailing
                 * spaces and newline character. #!prog is treated specially:
                 * following lines apply only to that program.
                 */
                for (p = cline; isspace(*p); ++p)
                        continue;
                if (*p == '\0')
                        continue;
                if (allow_includes &&
                    strncmp(p, include_str, include_len) == 0 &&
                    isspace(p[include_len])) {
                        p += include_len;
                        while (isspace(*p))
                                p++;
                        tmp = p;
                        while (*tmp != '\0' && !isspace(*tmp))
                                tmp++;
                        *tmp = '\0';
                        dprintf("Trying to include files in '%s'\n", p);
                        nents = scandir(p, &ent, configfiles, alphasort);
                        if (nents == -1) {
                                dprintf("Unable to open '%s': %s\n", p,
                                    strerror(errno));
                                continue;
                        }
                        for (i = 0; i < nents; i++) {
                                if (snprintf(file, sizeof(file), "%s/%s", p,
                                    ent[i]->d_name) >= (int)sizeof(file)) {
                                        dprintf("ignoring path too long: "
                                            "'%s/%s'\n", p, ent[i]->d_name);
                                        free(ent[i]);
                                        continue;
                                }
                                free(ent[i]);
                                cf2 = fopen(file, "r");
                                if (cf2 == NULL)
                                        continue;
                                dprintf("reading %s\n", file);
                                parseconfigfile(cf2, false, nvl_conf);
                                fclose(cf2);
                        }
                        free(ent);
                        continue;
                }
                if (*p == '#') {
                        p++;
                        if (*p == '\0' || strchr("!+-:", *p) == NULL)
                                continue;
                }
                if (*p == '+' || *p == '-') {
                        host[0] = *p++;
                        while (isspace(*p))
                                p++;
                        if (*p == '\0' || *p == '*') {
                                (void)strlcpy(host, "*", sizeof(host));
                                continue;
                        }
                        if (*p == '@')
                                p = LocalHostName;
                        for (i = 1; i < MAXHOSTNAMELEN - 1; i++) {
                                if (!isalnum(*p) && *p != '.' && *p != '-'
                                    && *p != ',' && *p != ':' && *p != '%')
                                        break;
                                host[i] = *p++;
                        }
                        host[i] = '\0';
                        continue;
                }
                if (*p == '!') {
                        p++;
                        while (isspace(*p))
                                p++;
                        if (*p == '\0' || *p == '*') {
                                (void)strlcpy(prog, "*", sizeof(prog));
                                continue;
                        }
                        for (i = 0; i < LINE_MAX - 1; i++) {
                                if (!isprint(p[i]) || isspace(p[i]))
                                        break;
                                prog[i] = p[i];
                        }
                        prog[i] = '\0';
                        continue;
                }
                if (*p == ':') {
                        p++;
                        while (isspace(*p))
                                p++;
                        if (*p == '\0' || *p == '*') {
                                (void)strlcpy(pfilter, "*", sizeof(pfilter));
                                continue;
                        }
                        (void)strlcpy(pfilter, p, sizeof(pfilter));
                        continue;
                }
                for (p = cline + 1; *p != '\0'; p++) {
                        if (*p != '#')
                                continue;
                        if (*(p - 1) == '\\') {
                                strcpy(p - 1, p);
                                p--;
                                continue;
                        }
                        *p = '\0';
                        break;
                }
                for (i = strlen(cline) - 1; i >= 0 && isspace(cline[i]); i--)
                        cline[i] = '\0';
                cfline(nvl_conf, cline, prog, host, pfilter);

        }
        return (nvl_conf);
}

/*
 * Read configuration file and create filed entries for each line.
 *
 * Note: This function is wrapped by cap_readconfigfile() when Capsicum
 * support is enabled so resources can be acquired outside of the security
 * sandbox.
 */
nvlist_t *
readconfigfile(const char *path)
{
        FILE *cf;
        nvlist_t *nvl_conf = nvlist_create(0);

        if ((cf = fopen(path, "r")) != NULL) {
                nvl_conf = parseconfigfile(cf, true, nvl_conf);
                (void)fclose(cf);
        } else {
                dprintf("cannot open %s\n", path);
                cfline(nvl_conf, "*.ERR\t/dev/console", "*", "*", "*");
                cfline(nvl_conf, "*.PANIC\t*", "*", "*", "*");
        }
        return (nvl_conf);
}

static void
fill_flist(nvlist_t *nvl_conf)
{
        const nvlist_t * const *filed_list;
        size_t nfileds;

        if (!nvlist_exists_nvlist_array(nvl_conf, "filed_list"))
                return;
        filed_list = nvlist_get_nvlist_array(nvl_conf, "filed_list",
            &nfileds);
        for (size_t i = 0; i < nfileds; ++i) {
                struct filed *f;

                f = nvlist_to_filed(filed_list[i]);
                STAILQ_INSERT_TAIL(&fhead, f, next);
        }
        nvlist_destroy(nvl_conf);
}

/*
 * Close all open log files.
 */
void
closelogfiles(void)
{
        struct filed *f;

        while (!STAILQ_EMPTY(&fhead)) {
                f = STAILQ_FIRST(&fhead);
                STAILQ_REMOVE_HEAD(&fhead, next);

                /* flush any pending output */
                if (f->f_prevcount)
                        fprintlog_successive(f, 0);

                switch (f->f_type) {
                case F_FILE:
                case F_FORW:
                case F_CONSOLE:
                case F_TTY:
                case F_PIPE:
                        close_filed(f);
                        break;
                default:
                        break;
                }

                if (f->f_prop_filter) {
                        switch (f->f_prop_filter->cmp_type) {
                        case FILT_CMP_REGEX:
                                regfree(f->f_prop_filter->pflt_re);
                                free(f->f_prop_filter->pflt_re);
                                /* FALLTHROUGH */
                        case FILT_CMP_CONTAINS:
                        case FILT_CMP_EQUAL:
                        case FILT_CMP_STARTS:
                                free(f->f_prop_filter->pflt_strval);
                                break;
                        }
                        free(f->f_prop_filter);
                }

                /*
                 * If a piped process is running, then defer the filed
                 * cleanup until it exits.
                 */
                if (f->f_type != F_PIPE || f->f_procdesc == -1)
                        free(f);
        }
}

static void
syslogd_cap_enter(void)
{
#ifdef WITH_CASPER
        cap_channel_t *cap_casper;
        cap_net_limit_t *limit;

        cap_casper = cap_init();
        if (cap_casper == NULL)
                err(1, "Failed to communicate with libcasper");
        cap_syslogd = cap_service_open(cap_casper, "syslogd.casper");
        if (cap_syslogd == NULL)
                err(1, "Failed to open the syslogd.casper libcasper service");
        cap_net = cap_service_open(cap_casper, "system.net");
        if (cap_net == NULL)
                err(1, "Failed to open the system.net libcasper service");
        cap_close(cap_casper);
        limit = cap_net_limit_init(cap_net,
            CAPNET_ADDR2NAME | CAPNET_NAME2ADDR);
        if (limit == NULL)
                err(1, "Failed to create system.net limits");
        if (cap_net_limit(limit) == -1)
                err(1, "Failed to apply system.net limits");
        caph_cache_tzdata();
        caph_cache_catpages();
        if (caph_enter_casper() == -1)
                err(1, "Failed to enter capability mode");
#endif
}

/*
 *  INIT -- Initialize syslogd from configuration table
 */
static void
init(bool reload)
{
        int i;
        char *p;
        char oldLocalHostName[MAXHOSTNAMELEN];
        char hostMsg[2*MAXHOSTNAMELEN+40];
        char bootfileMsg[MAXLINE + 1];

        dprintf("init\n");

        /*
         * Load hostname (may have changed).
         */
        if (reload)
                (void)strlcpy(oldLocalHostName, LocalHostName,
                    sizeof(oldLocalHostName));
        if (gethostname(LocalHostName, sizeof(LocalHostName)))
                err(EX_OSERR, "gethostname() failed");
        if ((p = strchr(LocalHostName, '.')) != NULL) {
                /* RFC 5424 prefers logging FQDNs. */
                if (IS_RFC3164_FORMAT)
                        *p = '\0';
                LocalDomain = p + 1;
        } else {
                LocalDomain = "";
        }

#ifndef WITH_CASPER
        /*
         * XXX: Disable when running in capability mode, for now.
         * This requires a new interface in the tzcode module to
         * get running without capability violations.
         *
         * Load / reload timezone data (in case it changed).
         *
         * Just calling tzset() again does not work, the timezone code
         * caches the result.  However, by setting the TZ variable, one
         * can defeat the caching and have the timezone code really
         * reload the timezone data.  Respect any initial setting of
         * TZ, in case the system is configured specially.
         */
        dprintf("loading timezone data via tzset()\n");
        if (getenv("TZ")) {
                tzset();
        } else {
                setenv("TZ", ":/etc/localtime", 1);
                tzset();
                unsetenv("TZ");
        }
#endif

        if (!reload) {
                struct tm tm;
                /* Cache time files before entering capability mode. */
                timegm(&tm);
                syslogd_cap_enter();
        }

        Initialized = false;
        closelogfiles();
        fill_flist(cap_readconfigfile(cap_syslogd, ConfFile));
        Initialized = true;

        if (Debug) {
                struct filed *f;
                int port;

                STAILQ_FOREACH(f, &fhead, next) {
                        for (i = 0; i <= LOG_NFACILITIES; i++)
                                if (f->f_pmask[i] == INTERNAL_NOPRI)
                                        printf("X ");
                                else
                                        printf("%d ", f->f_pmask[i]);
                        printf("%s: ", TypeNames[f->f_type]);
                        switch (f->f_type) {
                        case F_FILE:
                                printf("%s", f->f_fname);
                                break;

                        case F_CONSOLE:
                        case F_TTY:
                                printf("%s%s", _PATH_DEV, f->f_fname);
                                break;

                        case F_FORW: {
                                int domain, sockfd = f->f_addr_fds[0];
                                socklen_t len = sizeof(domain);

                                if (getsockopt(sockfd, SOL_SOCKET, SO_DOMAIN,
                                    &domain, &len) < 0)
                                        err(1, "getsockopt");

                                switch (domain) {
#ifdef INET
                                case AF_INET: {
                                        struct sockaddr_in sin;

                                        len = sizeof(sin);
                                        if (getpeername(sockfd, (struct sockaddr *)&sin, &len) < 0)
                                                err(1, "getpeername");
                                        port = ntohs(sin.sin_port);
                                        break;
                                }
#endif
#ifdef INET6
                                case AF_INET6: {
                                        struct sockaddr_in6 sin6;

                                        len = sizeof(sin6);
                                        if (getpeername(sockfd, (struct sockaddr *)&sin6, &len) < 0)
                                                err(1, "getpeername");
                                        port = ntohs(sin6.sin6_port);
                                        break;
                                }
#endif
                                default:
                                        port = 0;
                                }
                                if (port != 514) {
                                        printf("%s:%d", f->f_hname, port);
                                } else {
                                        printf("%s", f->f_hname);
                                }
                                break;
                        }

                        case F_PIPE:
                                printf("%s", f->f_pname);
                                break;

                        case F_USERS:
                                for (i = 0; i < MAXUNAMES && *f->f_uname[i]; i++)
                                        printf("%s, ", f->f_uname[i]);
                                break;
                        default:
                                break;
                        }
                        if (*f->f_program != '\0')
                                printf(" (%s)", f->f_program);
                        printf("\n");
                }
        }

        logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd", NULL,
            NULL, NULL, "restart", 0);
        dprintf("syslogd: restarted\n");
        /*
         * Log a change in hostname, but only on reload.
         */
        if (reload && strcmp(oldLocalHostName, LocalHostName) != 0) {
                (void)snprintf(hostMsg, sizeof(hostMsg),
                    "hostname changed, \"%s\" to \"%s\"",
                    oldLocalHostName, LocalHostName);
                logmsg(LOG_SYSLOG | LOG_INFO, NULL, LocalHostName, "syslogd",
                    NULL, NULL, NULL, hostMsg, 0);
                dprintf("%s\n", hostMsg);
        }
        /*
         * Log the kernel boot file if we aren't going to use it as
         * the prefix, and if this is *not* a reload.
         */
        if (!reload && !use_bootfile) {
                (void)snprintf(bootfileMsg, sizeof(bootfileMsg),
                    "kernel boot file is %s", bootfile);
                logmsg(LOG_KERN | LOG_INFO, NULL, LocalHostName, "syslogd",
                    NULL, NULL, NULL, bootfileMsg, 0);
                dprintf("%s\n", bootfileMsg);
        }
}

/*
 * Compile property-based filter.
 */
static nvlist_t *
prop_filter_compile(const char *cfilter)
{
        nvlist_t *nvl_pfilter;
        struct prop_filter pfilter = { };
        char *filter, *filter_endpos, *filter_begpos, *p;
        char **ap, *argv[2] = {NULL, NULL};
        int escaped;

        filter = strdup(cfilter);
        if (filter == NULL)
                err(1, "strdup");
        filter_begpos = filter;

        /*
         * Here's some filter examples mentioned in syslog.conf(5)
         * 'msg, contains, ".*Deny.*"'
         * 'programname, regex, "^bird6?$"'
         * 'hostname, icase_ereregex, "^server-(dcA|podB)-rack1[0-9]{2}\\..*"'
         */

        /*
         * Split filter into 3 parts: property name (argv[0]),
         * cmp type (argv[1]) and lvalue for comparison (filter).
         */
        for (ap = argv; (*ap = strsep(&filter, ", \t\n")) != NULL;) {
                if (**ap != '\0')
                        if (++ap >= &argv[2])
                                break;
        }

        if (argv[0] == NULL || argv[1] == NULL) {
                dprintf("filter parse error");
                goto error;
        }

        /* fill in prop_type */
        if (strcasecmp(argv[0], "msg") == 0)
                pfilter.prop_type = FILT_PROP_MSG;
        else if (strcasecmp(argv[0], "hostname") == 0)
                pfilter.prop_type = FILT_PROP_HOSTNAME;
        else if (strcasecmp(argv[0], "source") == 0)
                pfilter.prop_type = FILT_PROP_HOSTNAME;
        else if (strcasecmp(argv[0], "programname") == 0)
                pfilter.prop_type = FILT_PROP_PROGNAME;
        else {
                dprintf("unknown property");
                goto error;
        }

        /* full in cmp_flags (i.e. !contains, icase_regex, etc.) */
        if (*argv[1] == '!') {
                pfilter.cmp_flags |= FILT_FLAG_EXCLUDE;
                argv[1]++;
        }
        if (strncasecmp(argv[1], "icase_", (sizeof("icase_") - 1)) == 0) {
                pfilter.cmp_flags |= FILT_FLAG_ICASE;
                argv[1] += sizeof("icase_") - 1;
        }

        /* fill in cmp_type */
        if (strcasecmp(argv[1], "contains") == 0)
                pfilter.cmp_type = FILT_CMP_CONTAINS;
        else if (strcasecmp(argv[1], "isequal") == 0)
                pfilter.cmp_type = FILT_CMP_EQUAL;
        else if (strcasecmp(argv[1], "startswith") == 0)
                pfilter.cmp_type = FILT_CMP_STARTS;
        else if (strcasecmp(argv[1], "regex") == 0)
                pfilter.cmp_type = FILT_CMP_REGEX;
        else if (strcasecmp(argv[1], "ereregex") == 0) {
                pfilter.cmp_type = FILT_CMP_REGEX;
                pfilter.cmp_flags |= FILT_FLAG_EXTENDED;
        } else {
                dprintf("unknown cmp function");
                goto error;
        }

        /*
         * Handle filter value
         */

        /* ' ".*Deny.*"' */
        /* remove leading whitespace and check for '"' next character  */
        filter += strspn(filter, ", \t\n");
        if (*filter != '"' || strlen(filter) < 3) {
                dprintf("property value parse error");
                goto error;
        }
        filter++;

        /* '.*Deny.*"' */
        /* process possible backslash (\") escaping */
        escaped = 0;
        filter_endpos = filter;
        for (p = filter; *p != '\0'; p++) {
                if (*p == '\\' && !escaped) {
                        escaped = 1;
                        /* do not shift filter_endpos */
                        continue;
                }
                if (*p == '"' && !escaped) {
                        p++;
                        break;
                }
                /* we've seen some esc symbols, need to compress the line */
                if (filter_endpos != p)
                        *filter_endpos = *p;

                filter_endpos++;
                escaped = 0;
        }

        *filter_endpos = '\0';
        /* '.*Deny.*' */

        /* We should not have anything but whitespace left after closing '"' */
        if (*p != '\0' && strspn(p, " \t\n") != strlen(p)) {
                dprintf("property value parse error");
                goto error;
        }

        pfilter.pflt_strval = filter;
        /* An nvlist is heap allocated heap here. */
        nvl_pfilter = prop_filter_to_nvlist(&pfilter);

        free(filter_begpos);
        return (nvl_pfilter);
error:
        free(filter_begpos);
        return (NULL);
}

static const char *
parse_selector(const char *p, struct filed *f)
{
        int i, pri;
        int pri_done = 0, pri_cmp = 0, pri_invert = 0;
        char *bp, buf[LINE_MAX];
        const char *q;

        /* find the end of this facility name list */
        for (q = p; *q && *q != '\t' && *q != ' ' && *q++ != '.';)
                continue;

        /* get the priority comparison */
        if (*q == '!') {
                pri_invert = 1;
                q++;
        }
        while (!pri_done) {
                switch (*q) {
                        case '<':
                                pri_cmp |= PRI_LT;
                                q++;
                                break;
                        case '=':
                                pri_cmp |= PRI_EQ;
                                q++;
                                break;
                        case '>':
                                pri_cmp |= PRI_GT;
                                q++;
                                break;
                        default:
                                pri_done++;
                                break;
                }
        }

        /* collect priority name */
        for (bp = buf; *q != '\0' && !strchr("\t,; ", *q); )
                *bp++ = *q++;
        *bp = '\0';

        /* skip cruft */
        while (strchr(",;", *q))
                q++;

        /* decode priority name */
        if (*buf == '*') {
                pri = LOG_PRIMASK;
                pri_cmp = PRI_LT | PRI_EQ | PRI_GT;
        } else {
                /* Ignore trailing spaces. */
                for (i = strlen(buf) - 1; i >= 0 && buf[i] == ' '; i--)
                        buf[i] = '\0';

                pri = decode(buf, prioritynames);
                if (pri < 0) {
                        warnx("unknown priority name \"%s\", setting to 'info'",
                            buf);
                        pri = LOG_INFO;
                }
        }
        if (!pri_cmp)
                pri_cmp = UniquePriority ? PRI_EQ : (PRI_EQ | PRI_GT);
        if (pri_invert)
                pri_cmp ^= PRI_LT | PRI_EQ | PRI_GT;

        /* scan facilities */
        while (*p != '\0' && !strchr("\t.; ", *p)) {
                for (bp = buf; *p != '\0' && !strchr("\t,;. ", *p); )
                        *bp++ = *p++;
                *bp = '\0';

                if (*buf == '*') {
                        for (i = 0; i < LOG_NFACILITIES; i++) {
                                f->f_pmask[i] = pri;
                                f->f_pcmp[i] = pri_cmp;
                        }
                } else {
                        i = decode(buf, facilitynames);
                        if (i < 0) {
                                warnx("unknown facility name \"%s\", ignoring",
                                    buf);
                        } else {
                                f->f_pmask[i >> 3] = pri;
                                f->f_pcmp[i >> 3] = pri_cmp;
                        }
                }
                while (*p == ',' || *p == ' ')
                        p++;
        }
        return (q);
}

static int
maybe_dup_forw_socket(const nvlist_t *nvl, const struct sockaddr *rsa,
    const struct sockaddr *lsa)
{
        const nvlist_t * const *line;
        size_t linecount;

        if (!nvlist_exists_nvlist_array(nvl, "filed_list"))
                return (-1);
        line = nvlist_get_nvlist_array(nvl, "filed_list", &linecount);
        for (size_t i = 0; i < linecount; i++) {
                const struct forw_addr *forw;
                const int *fdp;
                size_t fdc;

                if (nvlist_get_number(line[i], "f_type") != F_FORW)
                        continue;
                fdp = nvlist_get_descriptor_array(line[i], "f_addr_fds", &fdc);
                forw = nvlist_get_binary(line[i], "f_addrs", NULL);
                for (size_t j = 0; j < fdc; j++) {
                        int fd;

                        if (memcmp(&forw[j].raddr, rsa, rsa->sa_len) != 0 ||
                            memcmp(&forw[j].laddr, lsa, lsa->sa_len) != 0)
                                continue;

                        fd = dup(fdp[j]);
                        if (fd < 0)
                                err(1, "dup");
                        return (fd);
                }
        }

        return (-1);
}

/*
 * Create a UDP socket that will forward messages from "lai" to "ai".
 * Capsicum doesn't permit connect() or sendto(), so we can't reuse the (bound)
 * sockets used to listen for messages.
 */
static int
make_forw_socket(const nvlist_t *nvl, struct addrinfo *ai, struct addrinfo *lai)
{
        int s;

        s = socket(ai->ai_family, ai->ai_socktype, 0);
        if (s < 0)
                err(1, "socket");
        if (lai != NULL) {
                if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1},
                    sizeof(int)) < 0)
                        err(1, "setsockopt");
                if (bind(s, lai->ai_addr, lai->ai_addrlen) < 0)
                        err(1, "bind");
        }
        if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
                if (errno == EADDRINUSE && lai != NULL) {
                        int s1;

                        s1 = maybe_dup_forw_socket(nvl, ai->ai_addr,
                            lai->ai_addr);
                        if (s1 < 0)
                                errc(1, EADDRINUSE, "connect");
                        (void)close(s);
                        s = s1;
                } else {
                        err(1, "connect");
                }
        }
        /* Make it a write-only socket. */
        if (shutdown(s, SHUT_RD) < 0)
                err(1, "shutdown");

        return (s);
}

static void
make_forw_socket_array(const nvlist_t *nvl, struct filed *f,
    struct addrinfo *res)
{
        struct addrinfo *ai;
        size_t i;

        f->f_num_addr_fds = 0;

        /* How many sockets do we need? */
        for (ai = res; ai != NULL; ai = ai->ai_next) {
                struct socklist *boundsock;
                int count;

                count = 0;
                STAILQ_FOREACH(boundsock, &shead, next) {
                        if (boundsock->sl_ai.ai_family == ai->ai_family)
                                count++;
                }
                if (count == 0)
                        count = 1;
                f->f_num_addr_fds += count;
        }

        f->f_addr_fds = calloc(f->f_num_addr_fds, sizeof(*f->f_addr_fds));
        f->f_addrs = calloc(f->f_num_addr_fds, sizeof(*f->f_addrs));
        if (f->f_addr_fds == NULL || f->f_addrs == NULL)
                err(1, "malloc failed");

        /*
         * Create our forwarding sockets: for each bound socket
         * belonging to the destination address, create one socket
         * connected to the destination and bound to the address of the
         * listening socket.
         */
        i = 0;
        for (ai = res; ai != NULL; ai = ai->ai_next) {
                struct socklist *boundsock;
                int count;

                count = 0;
                STAILQ_FOREACH(boundsock, &shead, next) {
                        if (boundsock->sl_ai.ai_family ==
                            ai->ai_family) {
                                memcpy(&f->f_addrs[i].raddr, ai->ai_addr,
                                    ai->ai_addrlen);
                                memcpy(&f->f_addrs[i].laddr,
                                    boundsock->sl_ai.ai_addr,
                                    boundsock->sl_ai.ai_addrlen);
                                f->f_addr_fds[i++] = make_forw_socket(nvl, ai,
                                    &boundsock->sl_ai);
                                count++;
                        }
                }
                if (count == 0) {
                        memcpy(&f->f_addrs[i].raddr, ai->ai_addr,
                            ai->ai_addrlen);
                        f->f_addr_fds[i++] = make_forw_socket(nvl, ai, NULL);
                }
        }
        assert(i == f->f_num_addr_fds);
}

static void
parse_action(const nvlist_t *nvl, const char *p, struct filed *f)
{
        struct addrinfo hints, *res;
        size_t i;
        int error;
        const char *q;
        bool syncfile;

        if (*p == '-') {
                syncfile = false;
                p++;
        } else
                syncfile = true;

        f->f_file = -1;
        switch (*p) {
        case '@':
                {
                        char *tp;
                        char endkey = ':';
                        /*
                         * scan forward to see if there is a port defined.
                         * so we can't use strlcpy..
                         */
                        i = sizeof(f->f_hname);
                        tp = f->f_hname;
                        p++;

                        /*
                         * an ipv6 address should start with a '[' in that case
                         * we should scan for a ']'
                         */
                        if (*p == '[') {
                                p++;
                                endkey = ']';
                        }
                        while (*p && (*p != endkey) && (i-- > 0)) {
                                *tp++ = *p++;
                        }
                        if (endkey == ']' && *p == endkey)
                                p++;
                        *tp = '\0';
                }
                /* See if we copied a domain and have a port */
                if (*p == ':')
                        p++;
                else
                        p = NULL;

                hints = (struct addrinfo){
                        .ai_family = family,
                        .ai_socktype = SOCK_DGRAM
                };
                error = getaddrinfo(f->f_hname, p ? p : "syslog", &hints, &res);
                if (error) {
                        dprintf("%s\n", gai_strerror(error));
                        break;
                }
                make_forw_socket_array(nvl, f, res);
                freeaddrinfo(res);
                f->f_type = F_FORW;
                break;

        case '/':
                if ((f->f_file = open(p, logflags, 0600)) < 0) {
                        f->f_type = F_UNUSED;
                        dprintf("%s\n", p);
                        break;
                }
                if (syncfile)
                        f->f_flags |= FFLAG_SYNC;
                if (isatty(f->f_file)) {
                        if (strcmp(p, _PATH_CONSOLE) == 0)
                                f->f_type = F_CONSOLE;
                        else
                                f->f_type = F_TTY;
                        (void)strlcpy(f->f_fname, p + sizeof(_PATH_DEV) - 1,
                            sizeof(f->f_fname));
                } else {
                        (void)strlcpy(f->f_fname, p, sizeof(f->f_fname));
                        f->f_type = F_FILE;
                }
                break;

        case '|':
                f->f_procdesc = -1;
                (void)strlcpy(f->f_pname, p + 1, sizeof(f->f_pname));
                f->f_type = F_PIPE;
                break;

        case '*':
                f->f_type = F_WALL;
                break;

        default:
                for (i = 0; i < MAXUNAMES && *p; i++) {
                        for (q = p; *q && *q != ','; )
                                q++;
                        (void)strncpy(f->f_uname[i], p, MAXLOGNAME - 1);
                        if ((q - p) >= MAXLOGNAME)
                                f->f_uname[i][MAXLOGNAME - 1] = '\0';
                        else
                                f->f_uname[i][q - p] = '\0';
                        while (*q == ',' || *q == ' ')
                                q++;
                        p = q;
                }
                f->f_type = F_USERS;
                break;
        }
}

/*
 * Convert a configuration file line to an nvlist and add to "nvl", which
 * contains all of the log configuration processed thus far.
 */
static void
cfline(nvlist_t *nvl, const char *line, const char *prog, const char *host,
    const char *pfilter)
{
        nvlist_t *nvl_filed;
        struct filed f = { };
        const char *p;

        dprintf("cfline(\"%s\", f, \"%s\", \"%s\", \"%s\")\n", line, prog,
            host, pfilter);

        for (int i = 0; i <= LOG_NFACILITIES; i++)
                f.f_pmask[i] = INTERNAL_NOPRI;

        /* save hostname if any */
        if (host != NULL && *host != '*') {
                int hl;

                strlcpy(f.f_host, host, sizeof(f.f_host));
                hl = strlen(f.f_host);
                if (hl > 0 && f.f_host[hl-1] == '.')
                        f.f_host[--hl] = '\0';
                /* RFC 5424 prefers logging FQDNs. */
                if (IS_RFC3164_FORMAT)
                        trimdomain(f.f_host, hl);
        }

        /* save program name if any */
        if (prog != NULL && *prog != '*')
                strlcpy(f.f_program, prog, sizeof(f.f_program));

        /* scan through the list of selectors */
        for (p = line; *p != '\0' && *p != '\t' && *p != ' ';)
                p = parse_selector(p, &f);

        /* skip to action part */
        while (*p == '\t' || *p == ' ')
                p++;
        parse_action(nvl, p, &f);

        /* An nvlist is heap allocated heap here. */
        nvl_filed = filed_to_nvlist(&f);
        close_filed(&f);

        if (pfilter && *pfilter != '*') {
                nvlist_t *nvl_pfilter;

                nvl_pfilter = prop_filter_compile(pfilter);
                if (nvl_pfilter == NULL)
                        err(1, "filter compile error");
                nvlist_add_nvlist(nvl_filed, "f_prop_filter", nvl_pfilter);
        }

        nvlist_append_nvlist_array(nvl, "filed_list", nvl_filed);
        nvlist_destroy(nvl_filed);
}

/*
 *  Decode a symbolic name to a numeric value
 */
static int
decode(const char *name, const CODE *codetab)
{
        const CODE *c;
        char *p, buf[40];

        if (isdigit(*name))
                return (atoi(name));

        for (p = buf; *name && p < &buf[sizeof(buf) - 1]; p++, name++) {
                if (isupper(*name))
                        *p = tolower(*name);
                else
                        *p = *name;
        }
        *p = '\0';
        for (c = codetab; c->c_name; c++)
                if (!strcmp(buf, c->c_name))
                        return (c->c_val);

        return (-1);
}

static void
markit(void)
{
        struct filed *f;
        struct deadq_entry *dq, *dq0;

        now = time((time_t *)NULL);
        MarkSeq += TIMERINTVL;
        if (MarkSeq >= MarkInterval) {
                logmsg(LOG_INFO, NULL, LocalHostName, NULL, NULL, NULL, NULL,
                    "-- MARK --", MARK);
                MarkSeq = 0;
        }

        STAILQ_FOREACH(f, &fhead, next) {
                if (f->f_prevcount && now >= REPEATTIME(f)) {
                        dprintf("flush %s: repeated %d times, %d sec.\n",
                            TypeNames[f->f_type], f->f_prevcount,
                            repeatinterval[f->f_repeatcount]);
                        fprintlog_successive(f, 0);
                        BACKOFF(f);
                }
        }

        /* Walk the dead queue, and see if we should signal somebody. */
        TAILQ_FOREACH_SAFE(dq, &deadq_head, dq_entries, dq0) {
                switch (dq->dq_timeout) {
                case 0:
                        /* Already signalled once, try harder now. */
                        (void)pdkill(dq->dq_procdesc, SIGKILL);
                        break;

                case 1:
                        (void)pdkill(dq->dq_procdesc, SIGTERM);
                        /* FALLTHROUGH. */
                default:
                        dq->dq_timeout--;
                }
        }
        (void)alarm(TIMERINTVL);
}

/*
 * fork off and become a daemon, but wait for the child to come online
 * before returning to the parent, or we get disk thrashing at boot etc.
 */
static int
waitdaemon(int maxwait)
{
        struct pollfd pollfd;
        int events, pipefd[2], status;
        pid_t pid;

        if (pipe(pipefd) == -1) {
                warn("failed to daemonize, pipe");
                die(0);
        }
        pid = fork();
        if (pid == -1) {
                warn("failed to daemonize, fork");
                die(0);
        } else if (pid > 0) {
                close(pipefd[1]);
                pollfd.fd = pipefd[0];
                pollfd.events = POLLHUP;
                events = poll(&pollfd, 1, maxwait * 1000);
                if (events == -1)
                        err(1, "failed to daemonize, poll");
                else if (events == 0)
                        errx(1, "timed out waiting for child");
                if (waitpid(pid, &status, WNOHANG) > 0) {
                        if (WIFEXITED(status))
                                errx(1, "child pid %d exited with return code %d",
                                    pid, WEXITSTATUS(status));
                        if (WIFSIGNALED(status))
                                errx(1, "child pid %d exited on signal %d%s",
                                    pid, WTERMSIG(status),
                                    WCOREDUMP(status) ? " (core dumped)" : "");
                }
                exit(0);
        }
        close(pipefd[0]);
        if (setsid() == -1) {
                warn("failed to daemonize, setsid");
                die(0);
        }
        (void)chdir("/");
        (void)dup2(nulldesc, STDIN_FILENO);
        (void)dup2(nulldesc, STDOUT_FILENO);
        (void)dup2(nulldesc, STDERR_FILENO);
        return (pipefd[1]);
}

/*
 * Add `s' to the list of allowable peer addresses to accept messages
 * from.
 *
 * `s' is a string in the form:
 *
 *    [*]domainname[:{servicename|portnumber|*}]
 *
 * or
 *
 *    netaddr/maskbits[:{servicename|portnumber|*}]
 *
 * Returns false on error, true if the argument was valid.
 */
static bool
#if defined(INET) || defined(INET6)
allowaddr(char *s)
#else
allowaddr(char *s __unused)
#endif
{
#if defined(INET) || defined(INET6)
        char *cp1, *cp2;
        struct allowedpeer *ap;
        struct servent *se;
        int masklen = -1;
        struct addrinfo hints, *res = NULL;
#ifdef INET
        in_addr_t *addrp, *maskp;
#endif
#ifdef INET6
        uint32_t *addr6p, *mask6p;
#endif
        char ip[NI_MAXHOST];

        ap = calloc(1, sizeof(*ap));
        if (ap == NULL)
                err(1, "malloc failed");

#ifdef INET6
        if (*s != '[' || (cp1 = strchr(s + 1, ']')) == NULL)
#endif
                cp1 = s;
        if ((cp1 = strrchr(cp1, ':'))) {
                /* service/port provided */
                *cp1++ = '\0';
                if (strlen(cp1) == 1 && *cp1 == '*')
                        /* any port allowed */
                        ap->port = 0;
                else if ((se = getservbyname(cp1, "udp"))) {
                        ap->port = ntohs(se->s_port);
                } else {
                        ap->port = strtol(cp1, &cp2, 0);
                        /* port not numeric */
                        if (*cp2 != '\0')
                                goto err;
                }
        } else {
                if ((se = getservbyname("syslog", "udp")))
                        ap->port = ntohs(se->s_port);
                else
                        /* sanity, should not happen */
                        ap->port = 514;
        }

        if ((cp1 = strchr(s, '/')) != NULL &&
            strspn(cp1 + 1, "0123456789") == strlen(cp1 + 1)) {
                *cp1 = '\0';
                if ((masklen = atoi(cp1 + 1)) < 0)
                        goto err;
        }
#ifdef INET6
        if (*s == '[') {
                cp2 = s + strlen(s) - 1;
                if (*cp2 == ']') {
                        ++s;
                        *cp2 = '\0';
                } else {
                        cp2 = NULL;
                }
        } else {
                cp2 = NULL;
        }
#endif
        hints = (struct addrinfo){
                .ai_family = PF_UNSPEC,
                .ai_socktype = SOCK_DGRAM,
                .ai_flags = AI_PASSIVE | AI_NUMERICHOST
        };
        if (getaddrinfo(s, NULL, &hints, &res) == 0) {
                ap->isnumeric = true;
                memcpy(&ap->a_addr, res->ai_addr, res->ai_addrlen);
                ap->a_mask = (struct sockaddr_storage){
                        .ss_family = res->ai_family,
                        .ss_len = res->ai_addrlen
                };
                switch (res->ai_family) {
#ifdef INET
                case AF_INET:
                        maskp = &sstosin(&ap->a_mask)->sin_addr.s_addr;
                        addrp = &sstosin(&ap->a_addr)->sin_addr.s_addr;
                        if (masklen < 0) {
                                /* use default netmask */
                                if (IN_CLASSA(ntohl(*addrp)))
                                        *maskp = htonl(IN_CLASSA_NET);
                                else if (IN_CLASSB(ntohl(*addrp)))
                                        *maskp = htonl(IN_CLASSB_NET);
                                else
                                        *maskp = htonl(IN_CLASSC_NET);
                        } else if (masklen == 0) {
                                *maskp = 0;
                        } else if (masklen <= 32) {
                                /* convert masklen to netmask */
                                *maskp = htonl(~((1 << (32 - masklen)) - 1));
                        } else {
                                goto err;
                        }
                        /* Lose any host bits in the network number. */
                        *addrp &= *maskp;
                        break;
#endif
#ifdef INET6
                case AF_INET6:
                        if (masklen > 128)
                                goto err;

                        if (masklen < 0)
                                masklen = 128;
                        mask6p = (uint32_t *)&sstosin6(&ap->a_mask)->sin6_addr.s6_addr32[0];
                        addr6p = (uint32_t *)&sstosin6(&ap->a_addr)->sin6_addr.s6_addr32[0];
                        /* convert masklen to netmask */
                        while (masklen > 0) {
                                if (masklen < 32) {
                                        *mask6p =
                                            htonl(~(0xffffffff >> masklen));
                                        *addr6p &= *mask6p;
                                        break;
                                } else {
                                        *mask6p++ = 0xffffffff;
                                        addr6p++;
                                        masklen -= 32;
                                }
                        }
                        break;
#endif
                default:
                        goto err;
                }
                freeaddrinfo(res);
        } else {
                /* arg `s' is domain name */
                ap->isnumeric = false;
                ap->a_name = s;
                if (cp1)
                        *cp1 = '/';
#ifdef INET6
                if (cp2) {
                        *cp2 = ']';
                        --s;
                }
#endif
        }
        STAILQ_INSERT_TAIL(&aphead, ap, next);

        if (Debug) {
                printf("allowaddr: rule ");
                if (ap->isnumeric) {
                        printf("numeric, ");
                        getnameinfo(sstosa(&ap->a_addr),
                                    (sstosa(&ap->a_addr))->sa_len,
                                    ip, sizeof(ip), NULL, 0, NI_NUMERICHOST);
                        printf("addr = %s, ", ip);
                        getnameinfo(sstosa(&ap->a_mask),
                                    (sstosa(&ap->a_mask))->sa_len,
                                    ip, sizeof(ip), NULL, 0, NI_NUMERICHOST);
                        printf("mask = %s; ", ip);
                } else {
                        printf("domainname = %s; ", ap->a_name);
                }
                printf("port = %d\n", ap->port);
        }

        return (true);
err:
        if (res != NULL)
                freeaddrinfo(res);
        free(ap);
#endif
        return (false);
}

/*
 * Validate that the remote peer has permission to log to us.
 */
static bool
validate(struct sockaddr *sa, const char *hname)
{
        int i;
        char name[NI_MAXHOST], ip[NI_MAXHOST], port[NI_MAXSERV];
        struct allowedpeer *ap;
#ifdef INET
        struct sockaddr_in *sin4, *a4p = NULL, *m4p = NULL;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6, *a6p = NULL, *m6p = NULL;
#endif
        struct addrinfo hints, *res;
        u_short sport;

        /* traditional behaviour, allow everything */
        if (STAILQ_EMPTY(&aphead))
                return (true);

        (void)strlcpy(name, hname, sizeof(name));
        hints = (struct addrinfo){
                .ai_family = PF_UNSPEC,
                .ai_socktype = SOCK_DGRAM,
                .ai_flags = AI_PASSIVE | AI_NUMERICHOST
        };
        if (cap_getaddrinfo(cap_net, name, NULL, &hints, &res) == 0)
                freeaddrinfo(res);
        else if (strchr(name, '.') == NULL) {
                strlcat(name, ".", sizeof(name));
                strlcat(name, LocalDomain, sizeof(name));
        }
        if (cap_getnameinfo(cap_net, sa, sa->sa_len, ip, sizeof(ip), port,
            sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV) != 0)
                return (false); /* for safety, should not occur */
        dprintf("validate: dgram from IP %s, port %s, name %s;\n",
                ip, port, name);
        sport = atoi(port);

        /* now, walk down the list */
        i = 0;
        STAILQ_FOREACH(ap, &aphead, next) {
                i++;
                if (ap->port != 0 && ap->port != sport) {
                        dprintf("rejected in rule %d due to port mismatch.\n",
                            i);
                        continue;
                }

                if (ap->isnumeric) {
                        if (ap->a_addr.ss_family != sa->sa_family) {
                                dprintf("rejected in rule %d due to address family mismatch.\n", i);
                                continue;
                        }
#ifdef INET
                        else if (ap->a_addr.ss_family == AF_INET) {
                                sin4 = satosin(sa);
                                a4p = satosin(&ap->a_addr);
                                m4p = satosin(&ap->a_mask);
                                if ((sin4->sin_addr.s_addr & m4p->sin_addr.s_addr)
                                    != a4p->sin_addr.s_addr) {
                                        dprintf("rejected in rule %d due to IP mismatch.\n", i);
                                        continue;
                                }
                        }
#endif
#ifdef INET6
                        else if (ap->a_addr.ss_family == AF_INET6) {
                                sin6 = satosin6(sa);
                                a6p = satosin6(&ap->a_addr);
                                m6p = satosin6(&ap->a_mask);
                                if (a6p->sin6_scope_id != 0 &&
                                    sin6->sin6_scope_id != a6p->sin6_scope_id) {
                                        dprintf("rejected in rule %d due to scope mismatch.\n", i);
                                        continue;
                                }
                                if (!IN6_ARE_MASKED_ADDR_EQUAL(&sin6->sin6_addr,
                                    &a6p->sin6_addr, &m6p->sin6_addr)) {
                                        dprintf("rejected in rule %d due to IP mismatch.\n", i);
                                        continue;
                                }
                        }
#endif
                        else
                                continue;
                } else {
                        if (fnmatch(ap->a_name, name, FNM_NOESCAPE) ==
                            FNM_NOMATCH) {
                                dprintf("rejected in rule %d due to name "
                                    "mismatch.\n", i);
                                continue;
                        }
                }
                dprintf("accepted in rule %d.\n", i);
                return (true);  /* hooray! */
        }
        return (false);
}

/*
 * Fairly similar to popen(3), but returns an open descriptor, as
 * opposed to a FILE *.
 *
 * Note: This function is wrapped by cap_p_open() when Capsicum support is
 * enabled, which allows piped processes to run outside of the capability
 * sandbox.
 */
int
p_open(const char *prog, int *rpd)
{
        struct sigaction act = { };
        int pfd[2], pd;
        pid_t pid;
        char *argv[4]; /* sh -c cmd NULL */

        if (pipe(pfd) == -1)
                return (-1);

        switch ((pid = pdfork(&pd, PD_CLOEXEC))) {
        case -1:
                return (-1);

        case 0:
                (void)setsid(); /* Avoid catching SIGHUPs. */
                argv[0] = strdup("sh");
                argv[1] = strdup("-c");
                argv[2] = strdup(prog);
                argv[3] = NULL;
                if (argv[0] == NULL || argv[1] == NULL || argv[2] == NULL)
                        err(1, "strdup");

                alarm(0);
                act.sa_handler = SIG_DFL;
                for (size_t i = 0; i < nitems(sigcatch); ++i) {
                        if (sigaction(sigcatch[i], &act, NULL) == -1)
                                err(1, "sigaction");
                }

                dup2(pfd[0], STDIN_FILENO);
                dup2(nulldesc, STDOUT_FILENO);
                dup2(nulldesc, STDERR_FILENO);
                closefrom(STDERR_FILENO + 1);

                (void)execvp(_PATH_BSHELL, argv);
                _exit(255);
        }
        close(pfd[0]);
        /*
         * Avoid blocking on a hung pipe.  With O_NONBLOCK, we are
         * supposed to get an EWOULDBLOCK on writev(2), which is
         * caught by the logic above anyway, which will in turn close
         * the pipe, and fork a new logging subprocess if necessary.
         * The stale subprocess will be killed some time later unless
         * it terminated itself due to closing its input pipe (so we
         * get rid of really dead puppies).
         */
        if (fcntl(pfd[1], F_SETFL, O_NONBLOCK) == -1) {
                /* This is bad. */
                dprintf("Warning: cannot change pipe to PID %d to non-blocking"
                    "behaviour.", pid);
        }
        *rpd = pd;
        return (pfd[1]);
}

static struct deadq_entry *
deadq_enter(int pd)
{
        struct deadq_entry *dq;

        if (pd == -1)
                return (NULL);

        dq = malloc(sizeof(*dq));
        if (dq == NULL) {
                logerror("malloc");
                exit(1);
        }

        dq->dq_procdesc = pd;
        dq->dq_timeout = DQ_TIMO_INIT;
        TAILQ_INSERT_TAIL(&deadq_head, dq, dq_entries);
        return (dq);
}

static void
deadq_remove(struct deadq_entry *dq)
{
        TAILQ_REMOVE(&deadq_head, dq, dq_entries);
        free(dq);
}

static void
log_deadchild(int pd, int status, const struct filed *f)
{
        pid_t pid;
        int code;
        char buf[256];
        const char *reason;

        errno = 0; /* Keep strerror() stuff out of logerror messages. */
        if (WIFSIGNALED(status)) {
                reason = "due to signal";
                code = WTERMSIG(status);
        } else {
                reason = "with status";
                code = WEXITSTATUS(status);
                if (code == 0)
                        return;
        }
        if (pdgetpid(pd, &pid) == -1)
                err(1, "pdgetpid");
        (void)snprintf(buf, sizeof(buf),
            "Logging subprocess %d (%s) exited %s %d.",
            pid, f->f_pname, reason, code);
        logerror(buf);
}

static struct socklist *
socksetup(struct addrinfo *ai, const char *name, mode_t mode)
{
        struct socklist *sl;
        int (*sl_recv)(struct socklist *);
        int s, optval = 1;

        if (ai->ai_family != AF_LOCAL && SecureMode > 1) {
                /* Only AF_LOCAL in secure mode. */
                return (NULL);
        }
        if (family != AF_UNSPEC && ai->ai_family != AF_LOCAL &&
            ai->ai_family != family)
                return (NULL);

        s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
        if (s < 0) {
                logerror("socket");
                return (NULL);
        }
#ifdef INET6
        if (ai->ai_family == AF_INET6) {
                if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &optval,
                    sizeof(int)) < 0) {
                        logerror("setsockopt(IPV6_V6ONLY)");
                        close(s);
                        return (NULL);
                }
        }
#endif
        if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &optval,
            sizeof(int)) < 0) {
                logerror("setsockopt(SO_REUSEADDR)");
                close(s);
                return (NULL);
        }

        /*
         * Bind INET and UNIX-domain sockets.
         *
         * A UNIX-domain socket is always bound to a pathname
         * regardless of -N flag.
         *
         * For INET sockets, RFC 3164 recommends that client
         * side message should come from the privileged syslogd port.
         *
         * If the system administrator chooses not to obey
         * this, we can skip the bind() step so that the
         * system will choose a port for us.
         */
        if (ai->ai_family == AF_LOCAL)
                unlink(name);
        if (ai->ai_family == AF_LOCAL || NoBind == 0 || name != NULL) {
                mode_t mask;
                int error;

                if (ai->ai_family == AF_LOCAL && fchmod(s, mode) < 0) {
                        dprintf("fchmod %s: %s\n", name, strerror(errno));
                        close(s);
                        return (NULL);
                }

                if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &(int){1},
                    sizeof(int)) < 0) {
                        logerror("setsockopt(SO_REUSEPORT)");
                        close(s);
                        return (NULL);
                }

                /*
                 * For AF_LOCAL sockets, the process umask is applied to the
                 * mode set above, so temporarily clear it to ensure that the
                 * socket always has the correct permissions.
                 */
                mask = umask(0);
                error = bind(s, ai->ai_addr, ai->ai_addrlen);
                (void)umask(mask);
                if (error < 0) {
                        logerror("bind");
                        close(s);
                        return (NULL);
                }
                if (ai->ai_family == AF_LOCAL || SecureMode == 0)
                        increase_rcvbuf(s);
        }
        dprintf("new socket fd is %d\n", s);
        sl_recv = socklist_recv_sock;
#if defined(INET) || defined(INET6)
        if (SecureMode && (ai->ai_family == AF_INET ||
            ai->ai_family == AF_INET6)) {
                dprintf("shutdown\n");
                /* Forbid communication in secure mode. */
                if (shutdown(s, SHUT_RD) < 0 && errno != ENOTCONN) {
                        logerror("shutdown");
                        if (!Debug)
                                die(0);
                }
                sl_recv = NULL;
        } else
#endif
                dprintf("listening on socket\n");
        dprintf("sending on socket\n");
        /* Copy *ai->ai_addr to the tail of struct socklist if any. */
        sl = calloc(1, sizeof(*sl) + ai->ai_addrlen);
        if (sl == NULL)
                err(1, "malloc failed");
        sl->sl_socket = s;
        if (ai->ai_family == AF_LOCAL) {
                char *name2 = strdup(name);
                if (name2 == NULL)
                        err(1, "strdup failed");
                sl->sl_name = strdup(basename(name2));
                sl->sl_dirfd = open(dirname(name2), O_DIRECTORY);
                if (sl->sl_name == NULL || sl->sl_dirfd == -1)
                        err(1, "failed to save dir info for %s", name);
                free(name2);
        }
        sl->sl_recv = sl_recv;
        (void)memcpy(&sl->sl_ai, ai, sizeof(*ai));
        if (ai->ai_addrlen > 0) {
                (void)memcpy((sl + 1), ai->ai_addr, ai->ai_addrlen);
                sl->sl_sa = (struct sockaddr *)(sl + 1);
        } else {
                sl->sl_sa = NULL;
        }
        return (sl);
}

static void
increase_rcvbuf(int fd)
{
        socklen_t len;

        if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len,
            &(socklen_t){sizeof(len)}) == 0) {
                if (len < RCVBUF_MINSIZE) {
                        len = RCVBUF_MINSIZE;
                        setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len));
                }
        }
}