/* dirmngr.c - Keyserver and X.509 LDAP access
 * Copyright (C) 2002 Klarälvdalens Datakonsult AB
 * Copyright (C) 2003-2004, 2006-2007, 2008, 2010-2011, 2020 g10 Code GmbH
 * Copyright (C) 2014 Werner Koch
 *
 * This file is part of GnuPG.
 *
 * GnuPG is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GnuPG is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <https://www.gnu.org/licenses/>.
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <time.h>
#include <fcntl.h>
#ifndef HAVE_W32_SYSTEM
#include <sys/socket.h>
#include <sys/un.h>
#endif
#include <sys/stat.h>
#include <unistd.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#ifdef HAVE_INOTIFY_INIT
# include <sys/inotify.h>
#endif /*HAVE_INOTIFY_INIT*/
#include <npth.h>

#include "dirmngr-err.h"

#if  HTTP_USE_NTBTLS
# include <ntbtls.h>
#elif HTTP_USE_GNUTLS
# include <gnutls/gnutls.h>
#endif /*HTTP_USE_GNUTLS*/


#define INCLUDED_BY_MAIN_MODULE 1
#define GNUPG_COMMON_NEED_AFLOCAL
#include "dirmngr.h"

#include <assuan.h>

#include "certcache.h"
#include "crlcache.h"
#include "crlfetch.h"
#include "misc.h"
#if USE_LDAP
# include "ldapserver.h"
#endif
#include "../common/asshelp.h"
#if USE_LDAP
# include "ldap-wrapper.h"
#endif
#include "../common/comopt.h"
#include "../common/init.h"
#include "../common/gc-opt-flags.h"
#include "dns-stuff.h"
#include "http-common.h"

#ifndef ENAMETOOLONG
# define ENAMETOOLONG EINVAL
#endif


enum cmd_and_opt_values {
  aNull = 0,
  oCsh		  = 'c',
  oQuiet	  = 'q',
  oSh		  = 's',
  oVerbose	  = 'v',
  oNoVerbose = 500,

  aServer,
  aDaemon,
  aSupervised,
  aListCRLs,
  aLoadCRL,
  aFetchCRL,
  aShutdown,
  aFlush,
  aGPGConfList,
  aGPGConfTest,
  aGPGConfVersions,

  oOptions,
  oDebug,
  oDebugAll,
  oDebugWait,
  oDebugLevel,
  oGnutlsDebug,
  oDebugCacheExpiredCerts,
  oNoGreeting,
  oNoOptions,
  oHomedir,
  oNoDetach,
  oLogFile,
  oBatch,
  oDisableHTTP,
  oDisableLDAP,
  oDisableIPv4,
  oDisableIPv6,
  oIgnoreLDAPDP,
  oIgnoreHTTPDP,
  oIgnoreOCSPSvcUrl,
  oHonorHTTPProxy,
  oHTTPProxy,
  oLDAPProxy,
  oOnlyLDAPProxy,
  oLDAPServer,
  oLDAPFile,
  oLDAPTimeout,
  oLDAPAddServers,
  oOCSPResponder,
  oOCSPSigner,
  oOCSPMaxClockSkew,
  oOCSPMaxPeriod,
  oOCSPCurrentPeriod,
  oMaxReplies,
  oHkpCaCert,
  oFakedSystemTime,
  oForce,
  oAllowOCSP,
  oAllowVersionCheck,
  oStealSocket,
  oSocketName,
  oLDAPWrapperProgram,
  oHTTPWrapperProgram,
  oIgnoreCert,
  oIgnoreCertExtension,
  oIgnoreCRLExtension,
  oUseTor,
  oNoUseTor,
  oKeyServer,
  oNameServer,
  oDisableCheckOwnSocket,
  oStandardResolver,
  oRecursiveResolver,
  oResolverTimeout,
  oConnectTimeout,
  oConnectQuickTimeout,
  oListenBacklog,
  oFakeCRL,
  oCompatibilityFlags,
  oUserAgent,
  aTest
};



static gpgrt_opt_t opts[] = {

  ARGPARSE_c (aGPGConfList, "gpgconf-list", "@"),
  ARGPARSE_c (aGPGConfTest, "gpgconf-test", "@"),
  ARGPARSE_c (aGPGConfVersions, "gpgconf-versions", "@"),

  ARGPARSE_group (300, N_("@Commands:\n ")),

  ARGPARSE_c (aServer,   "server",  N_("run in server mode (foreground)") ),
  ARGPARSE_c (aDaemon,   "daemon",  N_("run in daemon mode (background)") ),
#ifndef HAVE_W32_SYSTEM
  ARGPARSE_c (aSupervised,  "deprecated-supervised", "@"),
#endif
  ARGPARSE_c (aListCRLs, "list-crls", N_("list the contents of the CRL cache")),
  ARGPARSE_c (aLoadCRL,  "load-crl", N_("|FILE|load CRL from FILE into cache")),
  ARGPARSE_c (aFetchCRL, "fetch-crl", N_("|URL|fetch a CRL from URL")),
  ARGPARSE_c (aShutdown, "shutdown",  N_("shutdown the dirmngr")),
  ARGPARSE_c (aFlush,    "flush",     N_("flush the cache")),


  ARGPARSE_header (NULL, N_("Options used for startup")),

  ARGPARSE_s_n (oNoDetach, "no-detach", N_("do not detach from the console")),
  ARGPARSE_s_n (oSh,       "sh",        N_("sh-style command output")),
  ARGPARSE_s_n (oCsh,      "csh",       N_("csh-style command output")),
  ARGPARSE_s_n (oStealSocket, "steal-socket", "@"),
  ARGPARSE_s_s (oHomedir, "homedir", "@"),
  ARGPARSE_conffile (oOptions,  "options", N_("|FILE|read options from FILE")),
  ARGPARSE_noconffile (oNoOptions, "no-options", "@"),


  ARGPARSE_header ("Monitor", N_("Options controlling the diagnostic output")),

  ARGPARSE_s_n (oVerbose,  "verbose",   N_("verbose")),
  ARGPARSE_s_n (oQuiet,    "quiet",     N_("be somewhat more quiet")),
  ARGPARSE_s_n (oNoGreeting, "no-greeting", "@"),
  ARGPARSE_s_s (oDebugLevel, "debug-level",
                N_("|LEVEL|set the debugging level to LEVEL")),
  ARGPARSE_s_s (oDebug,    "debug", "@"),
  ARGPARSE_s_n (oDebugAll, "debug-all", "@"),
  ARGPARSE_s_i (oGnutlsDebug, "gnutls-debug", "@"),
  ARGPARSE_s_i (oGnutlsDebug, "tls-debug", "@"),
  ARGPARSE_s_i (oDebugWait, "debug-wait", "@"),
  ARGPARSE_s_s (oLogFile,  "log-file",
                N_("|FILE|write server mode logs to FILE")),


  ARGPARSE_header ("Configuration",
                   N_("Options controlling the configuration")),

  ARGPARSE_s_n (oAllowVersionCheck, "allow-version-check",
                N_("allow online software version check")),
  ARGPARSE_s_i (oListenBacklog, "listen-backlog", "@"),
  ARGPARSE_s_i (oMaxReplies, "max-replies",
                N_("|N|do not return more than N items in one query")),
  ARGPARSE_s_s (oFakedSystemTime, "faked-system-time", "@"),
  ARGPARSE_s_n (oDisableCheckOwnSocket, "disable-check-own-socket", "@"),
  ARGPARSE_s_s (oIgnoreCert,"ignore-cert", "@"),
  ARGPARSE_s_s (oIgnoreCertExtension,"ignore-cert-extension", "@"),
  ARGPARSE_s_s (oIgnoreCRLExtension,"ignore-crl-extension", "@"),


  ARGPARSE_header ("Network", N_("Network related options")),

  ARGPARSE_s_n (oUseTor, "use-tor", N_("route all network traffic via Tor")),
  ARGPARSE_s_n (oNoUseTor, "no-use-tor", "@"),
  ARGPARSE_s_n (oDisableIPv4, "disable-ipv4", "@"),
  ARGPARSE_s_n (oDisableIPv6, "disable-ipv6", "@"),
  ARGPARSE_s_n (oStandardResolver, "standard-resolver", "@"),
  ARGPARSE_s_n (oRecursiveResolver, "recursive-resolver", "@"),
  ARGPARSE_s_i (oResolverTimeout, "resolver-timeout", "@"),
  ARGPARSE_s_s (oNameServer, "nameserver", "@"),
  ARGPARSE_s_i (oConnectTimeout, "connect-timeout", "@"),
  ARGPARSE_s_i (oConnectQuickTimeout, "connect-quick-timeout", "@"),


  ARGPARSE_header ("HTTP", N_("Configuration for HTTP servers")),

  ARGPARSE_s_n (oDisableHTTP, "disable-http", N_("inhibit the use of HTTP")),
  ARGPARSE_s_n (oIgnoreHTTPDP,"ignore-http-dp",
                N_("ignore HTTP CRL distribution points")),
  ARGPARSE_s_s (oHTTPProxy,  "http-proxy",
                N_("|URL|redirect all HTTP requests to URL")),
  ARGPARSE_s_n (oHonorHTTPProxy, "honor-http-proxy",
                N_("use system's HTTP proxy setting")),
  ARGPARSE_s_s (oUserAgent, "user-agent", "@"),
  ARGPARSE_s_s (oLDAPWrapperProgram, "ldap-wrapper-program", "@"),

  ARGPARSE_header ("Keyserver", N_("Configuration for OpenPGP servers")),

  ARGPARSE_s_s (oKeyServer, "keyserver",
                N_("|URL|use keyserver at URL")),
  ARGPARSE_s_s (oHkpCaCert, "hkp-cacert",
                N_("|FILE|use the CA certificates in FILE for HKP over TLS")),

  ARGPARSE_header ("LDAP", N_("Configuration for X.509 servers")),

  ARGPARSE_s_n (oDisableLDAP, "disable-ldap", N_("inhibit the use of LDAP")),
  ARGPARSE_s_n (oIgnoreLDAPDP,"ignore-ldap-dp",
                N_("ignore LDAP CRL distribution points")),
  ARGPARSE_s_s (oLDAPProxy,  "ldap-proxy",
                N_("|HOST|use HOST for LDAP queries")),
  ARGPARSE_s_n (oOnlyLDAPProxy, "only-ldap-proxy",
                N_("do not use fallback hosts with --ldap-proxy")),
  ARGPARSE_s_s (oLDAPServer, "ldapserver",
                N_("|SPEC|use this keyserver to lookup keys")),
  ARGPARSE_s_s (oLDAPFile, "ldapserverlist-file",
                N_("|FILE|read LDAP server list from FILE")),
  ARGPARSE_s_n (oLDAPAddServers, "add-servers",
                N_("add new servers discovered in CRL distribution"
                   " points to serverlist")),
  ARGPARSE_s_i (oLDAPTimeout, "ldaptimeout",
                N_("|N|set LDAP timeout to N seconds")),
  ARGPARSE_s_s (oFakeCRL, "fake-crl", "@"),

  ARGPARSE_header ("OCSP", N_("Configuration for OCSP")),

  ARGPARSE_s_n (oAllowOCSP, "allow-ocsp", N_("allow sending OCSP requests")),
  ARGPARSE_s_n (oIgnoreOCSPSvcUrl, "ignore-ocsp-service-url",
                N_("ignore certificate contained OCSP service URLs")),
  ARGPARSE_s_s (oOCSPResponder, "ocsp-responder",
                N_("|URL|use OCSP responder at URL")),
  ARGPARSE_s_s (oOCSPSigner, "ocsp-signer",
                N_("|FPR|OCSP response signed by FPR")),
  ARGPARSE_s_i (oOCSPMaxClockSkew, "ocsp-max-clock-skew", "@"),
  ARGPARSE_s_i (oOCSPMaxPeriod,    "ocsp-max-period", "@"),
  ARGPARSE_s_i (oOCSPCurrentPeriod, "ocsp-current-period", "@"),


  ARGPARSE_header (NULL, N_("Other options")),

  ARGPARSE_s_n (oForce,    "force",    N_("force loading of outdated CRLs")),

  ARGPARSE_s_s (oSocketName, "socket-name", "@"),  /* Only for debugging.  */
  ARGPARSE_s_n (oDebugCacheExpiredCerts, "debug-cache-expired-certs", "@"),
  ARGPARSE_s_s (oCompatibilityFlags, "compatibility-flags", "@"),

  ARGPARSE_header (NULL, ""),  /* Stop the header group.  */

  /* Not yet used options.  */
  ARGPARSE_s_n (oBatch,    "batch",       "@"),
  ARGPARSE_s_s (oHTTPWrapperProgram, "http-wrapper-program", "@"),


  ARGPARSE_group (302,N_("@\n(See the \"info\" manual for a complete listing "
                         "of all commands and options)\n")),

  ARGPARSE_end ()
};

/* The list of supported debug flags.  */
static struct debug_flags_s debug_flags [] =
  {
    { DBG_X509_VALUE   , "x509"    },
    { DBG_CRYPTO_VALUE , "crypto"  },
    { DBG_MEMORY_VALUE , "memory"  },
    { DBG_CACHE_VALUE  , "cache"   },
    { DBG_MEMSTAT_VALUE, "memstat" },
    { DBG_HASHING_VALUE, "hashing" },
    { DBG_IPC_VALUE    , "ipc"     },
    { DBG_DNS_VALUE    , "dns"     },
    { DBG_NETWORK_VALUE, "network" },
    { DBG_LOOKUP_VALUE , "lookup"  },
    { DBG_EXTPROG_VALUE, "extprog" },
    { DBG_KEEPTMP_VALUE, "keeptmp" },
    { DBG_LDAP_VALUE,    "ldap"    },
    { 77, NULL } /* 77 := Do not exit on "help" or "?".  */
  };

/* The list of compatibility flags.  */
static struct compatibility_flags_s compatibility_flags [] =
  {
    { COMPAT_RESTRICT_HTTP_REDIR, "restrict-http-redir" },
    { COMPAT_OCSP_SHA256_CERTID, "ocsp-sha256-certid" },
    { 0, NULL }
  };


#define DEFAULT_MAX_REPLIES 10
#define DEFAULT_LDAP_TIMEOUT 15  /* seconds */

#define DEFAULT_CONNECT_TIMEOUT       (15*1000)  /* 15 seconds */
#define DEFAULT_CONNECT_QUICK_TIMEOUT ( 2*1000)  /*  2 seconds */

/* For the cleanup handler we need to keep track of the socket's name.  */
static const char *socket_name;
/* If the socket has been redirected, this is the name of the
   redirected socket..  */
static const char *redir_socket_name;

/* We need to keep track of the server's nonces (these are dummies for
   POSIX systems). */
static assuan_sock_nonce_t socket_nonce;

/* Value for the listen() backlog argument.
 * Change at runtime with --listen-backlog.  */
static int listen_backlog = 64;

/* Only if this flag has been set will we remove the socket file.  */
static int cleanup_socket;

/* Keep track of the current log file so that we can avoid updating
   the log file after a SIGHUP if it didn't changed. Malloced. */
static char *current_logfile;

/* Helper to implement --debug-level. */
static const char *debug_level;

/* Helper to set the NTBTLS or GNUTLS log level.  */
static int opt_gnutls_debug = -1;

/* Flag indicating that a shutdown has been requested.  */
static volatile int shutdown_pending;

/* Flags to indicate that we shall not watch our own socket. */
static int disable_check_own_socket;

/* Flag indicating to start the daemon even if one already runs.  */
static int steal_socket;


/* Flag to control the Tor mode.  */
static enum
  { TOR_MODE_AUTO = 0,  /* Switch to NO or YES         */
    TOR_MODE_NEVER,     /* Never use Tor.              */
    TOR_MODE_NO,        /* Do not use Tor              */
    TOR_MODE_YES,       /* Use Tor                     */
    TOR_MODE_FORCE      /* Force using Tor             */
  } tor_mode;


/* Flag indicating that we are in supervised mode.  */
static int is_supervised;

/* Counter for the active connections.  */
static int active_connections;

/* This flag is set by any network access and used by the housekeeping
 * thread to run background network tasks.  */
static int network_activity_seen;

/* A list of filenames registered with --hkp-cacert.  */
static strlist_t hkp_cacert_filenames;

/* A flag used to clear the list of ldapservers iff --ldapserver is
 * given on the command line or one of the conf files. In this case we
 * want to clear all old specifications through the legacy
 * dirmngr_ldapservers.conf. */
static int ldapserver_list_needs_reset;

/* The timer tick used for housekeeping stuff.  The second constant is used when a shutdown is pending.  */
#define TIMERTICK_INTERVAL           (60)
#define TIMERTICK_INTERVAL_SHUTDOWN  (4)

/* How oft to run the housekeeping.  */
#define HOUSEKEEPING_INTERVAL      (600)


/* This union is used to avoid compiler warnings in case a pointer is
   64 bit and an int 32 bit.  We store an integer in a pointer and get
   it back later (npth_getspecific et al.).  */
union int_and_ptr_u
{
  int  aint;
  assuan_fd_t afd;
  void *aptr;
};



/* The key used to store the current file descriptor in the thread
   local storage.  We use this in conjunction with the
   log_set_pid_suffix_cb feature.  */
#ifndef HAVE_W32_SYSTEM
static npth_key_t my_tlskey_current_fd;
#endif

/* Prototypes. */
static void cleanup (void);
#if USE_LDAP
static ldap_server_t parse_ldapserver_file (const char* filename, int ienoent);
#endif /*USE_LDAP*/
static fingerprint_list_t parse_fingerprint_item (const char *string,
                                                  const  char *optionname,
                                                  int want_binary);
static void netactivity_action (void);
static void handle_connections (assuan_fd_t listen_fd);
static void gpgconf_versions (void);


static const char *
my_strusage( int level )
{
  const char *p;
  switch ( level )
    {
    case  9: p = "GPL-3.0-or-later"; break;
    case 11: p = "@DIRMNGR@ (@GNUPG@)";
      break;
    case 13: p = VERSION; break;
    case 14: p = GNUPG_DEF_COPYRIGHT_LINE; break;
    case 17: p = PRINTABLE_OS_NAME; break;
      /* TRANSLATORS: @EMAIL@ will get replaced by the actual bug
         reporting address.  This is so that we can change the
         reporting address without breaking the translations.  */
    case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;
    case 49: p = PACKAGE_BUGREPORT; break;
    case 1:
    case 40: p = _("Usage: @DIRMNGR@ [options] (-h for help)");
      break;
    case 41: p = _("Syntax: @DIRMNGR@ [options] [command [args]]\n"
                   "Keyserver, CRL, and OCSP access for @GNUPG@\n");
      break;

    default: p = NULL;
    }
  return p;
}


/* Callback from libksba to hash a provided buffer.  Our current
 * implementation does only allow SHA-1 and SHA-256 for hashing. This
 * may be extended by mapping the name, testing for algorithm
 * availibility and adjust the length checks accordingly.  */
static gpg_error_t
my_ksba_hash_buffer (void *arg, const char *oid,
                     const void *buffer, size_t length, size_t resultsize,
                     unsigned char *result, size_t *resultlen)
{
  (void)arg;

  if (!oid || !strcmp (oid, "1.3.14.3.2.26"))
    {
      if (resultsize < 20)
        return gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
      gcry_md_hash_buffer (GCRY_MD_SHA1, result, buffer, length);
      *resultlen = 20;
    }
  else if (!strcmp (oid, "2.16.840.1.101.3.4.2.1"))
    {
      if (resultsize < 32)
        return gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
      gcry_md_hash_buffer (GCRY_MD_SHA256, result, buffer, length);
      *resultlen = 32;
    }
  else
    return gpg_error (GPG_ERR_NOT_SUPPORTED);
  return 0;
}


/* GNUTLS log function callback.  */
#ifdef HTTP_USE_GNUTLS
static void
my_gnutls_log (int level, const char *text)
{
  int n;

  n = strlen (text);
  while (n && text[n-1] == '\n')
    n--;

  log_debug ("gnutls:L%d: %.*s\n", level, n, text);
}
#endif /*HTTP_USE_GNUTLS*/

/* Setup the debugging.  With a LEVEL of NULL only the active debug
   flags are propagated to the subsystems.  With LEVEL set, a specific
   set of debug flags is set; thus overriding all flags already
   set. */
static void
set_debug (void)
{
  int numok = (debug_level && digitp (debug_level));
  int numlvl = numok? atoi (debug_level) : 0;

  if (!debug_level)
    ;
  else if (!strcmp (debug_level, "none") || (numok && numlvl < 1))
    opt.debug = 0;
  else if (!strcmp (debug_level, "basic") || (numok && numlvl <= 2))
    opt.debug = DBG_IPC_VALUE;
  else if (!strcmp (debug_level, "advanced") || (numok && numlvl <= 5))
    opt.debug = (DBG_IPC_VALUE|DBG_X509_VALUE|DBG_LOOKUP_VALUE);
  else if (!strcmp (debug_level, "expert") || (numok && numlvl <= 8))
    opt.debug = (DBG_IPC_VALUE|DBG_X509_VALUE|DBG_LOOKUP_VALUE
                 |DBG_CACHE_VALUE|DBG_CRYPTO_VALUE);
  else if (!strcmp (debug_level, "guru") || numok)
    {
      opt.debug = ~0;
      /* Unless the "guru" string has been used we don't want to allow
         hashing debugging.  The rationale is that people tend to
         select the highest debug value and would then clutter their
         disk with debug files which may reveal confidential data.  */
      if (numok)
        opt.debug &= ~(DBG_HASHING_VALUE|DBG_KEEPTMP_VALUE);
    }
  else
    {
      log_error (_("invalid debug-level '%s' given\n"), debug_level);
      log_info (_("valid debug levels are: %s\n"),
                "none, basic, advanced, expert, guru");
      opt.debug = 0; /* Reset debugging, so that prior debug
                        statements won't have an undesired effect. */
    }


  if (opt.debug && !opt.verbose)
    {
      opt.verbose = 1;
      gcry_control (GCRYCTL_SET_VERBOSITY, (int)opt.verbose);
    }
  if (opt.debug && opt.quiet)
    opt.quiet = 0;

  if (opt.debug & DBG_CRYPTO_VALUE )
    gcry_control (GCRYCTL_SET_DEBUG_FLAGS, 1);

#if HTTP_USE_NTBTLS
  if (opt_gnutls_debug >= 0)
    {
      ntbtls_set_debug (opt_gnutls_debug, NULL, NULL);
    }
#elif HTTP_USE_GNUTLS
  if (opt_gnutls_debug >= 0)
    {
      gnutls_global_set_log_function (my_gnutls_log);
      gnutls_global_set_log_level (opt_gnutls_debug);
    }
#endif /*HTTP_USE_GNUTLS*/

  if (opt.debug)
    parse_debug_flag (NULL, &opt.debug, debug_flags);
}


static void
set_tor_mode (void)
{
  if (dirmngr_use_tor ())
    {
      /* Enable Tor mode and when called again force a new circuit
       * (e.g. on SIGHUP).  */
      enable_dns_tormode (1);
      if (assuan_sock_set_flag (ASSUAN_INVALID_FD, "tor-mode", 1))
        {
          log_error ("error enabling Tor mode: %s\n", strerror (errno));
          log_info ("(is your Libassuan recent enough?)\n");
        }
    }
  else
    disable_dns_tormode ();
}


/* Return true if Tor shall be used.  */
int
dirmngr_use_tor (void)
{
  if (tor_mode == TOR_MODE_AUTO)
    {
      /* Figure out whether Tor is running.  */
      assuan_fd_t sock;

      sock = assuan_sock_connect_byname (NULL, 0, 0, NULL, ASSUAN_SOCK_TOR);
      if (sock == ASSUAN_INVALID_FD)
        tor_mode = TOR_MODE_NO;
      else
        {
          tor_mode = TOR_MODE_YES;
          assuan_sock_close (sock);
        }
    }

  if (tor_mode == TOR_MODE_FORCE)
    return 2; /* Use Tor (using 2 to indicate force mode) */
  else if (tor_mode == TOR_MODE_YES)
    return 1; /* Use Tor */
  else
    return 0; /* Do not use Tor.  */
}


/* This is somewhat similar to dirmngr_use_tor but avoids a trial
 * connect and may thus be faster for this special case.  */
int
dirmngr_never_use_tor_p (void)
{
  return tor_mode == TOR_MODE_NEVER;
}


static void
wrong_args (const char *text)
{
  es_fprintf (es_stderr, _("usage: %s [options] "), DIRMNGR_NAME);
  es_fputs (text, es_stderr);
  es_putc ('\n', es_stderr);
  dirmngr_exit (2);
}


/* Helper to stop the reaper thread for the ldap wrapper.  */
static void
shutdown_reaper (void)
{
#if USE_LDAP
  ldap_wrapper_wait_connections ();
#endif
}


/* Handle options which are allowed to be reset after program start.
   Return true if the current option in PARGS could be handled and
   false if not.  As a special feature, passing a value of NULL for
   PARGS, resets the options to the default.  REREAD should be set
   true if it is not the initial option parsing. */
static int
parse_rereadable_options (gpgrt_argparse_t *pargs, int reread)
{
  if (!pargs)
    { /* Reset mode. */
      opt.quiet = 0;
      opt.verbose = 0;
      opt.debug = 0;
      opt.ldap_wrapper_program = NULL;
      opt.disable_http = 0;
      opt.disable_ldap = 0;
      opt.honor_http_proxy = 0;
      opt.http_proxy = NULL;
      opt.ldap_proxy = NULL;
      opt.only_ldap_proxy = 0;
      opt.ignore_http_dp = 0;
      opt.ignore_ldap_dp = 0;
      opt.ignore_ocsp_service_url = 0;
      opt.allow_ocsp = 0;
      opt.allow_version_check = 0;
      opt.ocsp_responder = NULL;
      opt.ocsp_max_clock_skew = 10 * 60;      /* 10 minutes.  */
      opt.ocsp_max_period = 90 * 86400;       /* 90 days.  */
      opt.ocsp_current_period = 3 * 60 * 60;  /* 3 hours. */
      opt.max_replies = DEFAULT_MAX_REPLIES;
      opt.user_agent = "GnuPG/2.6";
      while (opt.ocsp_signer)
        {
          fingerprint_list_t tmp = opt.ocsp_signer->next;
          xfree (opt.ocsp_signer);
          opt.ocsp_signer = tmp;
        }
      while (opt.ignored_certs)
        {
          fingerprint_list_t tmp = opt.ignored_certs->next;
          xfree (opt.ignored_certs);
          opt.ignored_certs = tmp;
        }
      FREE_STRLIST (opt.ignored_cert_extensions);
      FREE_STRLIST (opt.ignored_crl_extensions);
      http_register_tls_ca (NULL);
      FREE_STRLIST (hkp_cacert_filenames);
      FREE_STRLIST (opt.keyserver);
      /* Note: We do not allow resetting of TOR_MODE_FORCE at runtime.  */
      if (tor_mode != TOR_MODE_FORCE)
        tor_mode = TOR_MODE_AUTO;
      disable_check_own_socket = 0;
      enable_standard_resolver (0);
      set_dns_timeout (0);
      opt.connect_timeout = 0;
      opt.connect_quick_timeout = 0;
      opt.ldaptimeout = DEFAULT_LDAP_TIMEOUT;
      ldapserver_list_needs_reset = 1;
      opt.debug_cache_expired_certs = 0;
      xfree (opt.fake_crl);
      opt.fake_crl = NULL;
      opt.compat_flags = 0;
      return 1;
    }

  switch (pargs->r_opt)
    {
    case oQuiet:   opt.quiet = 1; break;
    case oVerbose: opt.verbose++; break;
    case oDebug:
      parse_debug_flag (pargs->r.ret_str, &opt.debug, debug_flags);
      break;
    case oDebugAll: opt.debug = ~0; break;
    case oDebugLevel: debug_level = pargs->r.ret_str; break;
    case oGnutlsDebug: opt_gnutls_debug = pargs->r.ret_int; break;

    case oLogFile:
      if (!reread)
        return 0; /* Not handled. */
      if (!current_logfile || !pargs->r.ret_str
          || strcmp (current_logfile, pargs->r.ret_str))
        {
          log_set_file (pargs->r.ret_str);
          xfree (current_logfile);
          current_logfile = xtrystrdup (pargs->r.ret_str);
        }
      break;

    case oDisableCheckOwnSocket: disable_check_own_socket = 1; break;

    case oLDAPWrapperProgram:
      opt.ldap_wrapper_program = pargs->r.ret_str;
      break;
    case oHTTPWrapperProgram:
      opt.http_wrapper_program = pargs->r.ret_str;
      break;

    case oDisableHTTP: opt.disable_http = 1; break;
    case oDisableLDAP: opt.disable_ldap = 1; break;
    case oDisableIPv4: opt.disable_ipv4 = 1; break;
    case oDisableIPv6: opt.disable_ipv6 = 1; break;
    case oHonorHTTPProxy: opt.honor_http_proxy = 1; break;
    case oHTTPProxy: opt.http_proxy = pargs->r.ret_str; break;
    case oLDAPProxy: opt.ldap_proxy = pargs->r.ret_str; break;
    case oOnlyLDAPProxy: opt.only_ldap_proxy = 1; break;
    case oIgnoreHTTPDP: opt.ignore_http_dp = 1; break;
    case oIgnoreLDAPDP: opt.ignore_ldap_dp = 1; break;
    case oIgnoreOCSPSvcUrl: opt.ignore_ocsp_service_url = 1; break;

    case oAllowOCSP: opt.allow_ocsp = 1; break;
    case oAllowVersionCheck: opt.allow_version_check = 1; break;
    case oOCSPResponder: opt.ocsp_responder = pargs->r.ret_str; break;
    case oOCSPSigner:
      opt.ocsp_signer = parse_fingerprint_item (pargs->r.ret_str,
                                                "--ocsp-signer", 0);
      break;
    case oOCSPMaxClockSkew: opt.ocsp_max_clock_skew = pargs->r.ret_int; break;
    case oOCSPMaxPeriod: opt.ocsp_max_period = pargs->r.ret_int; break;
    case oOCSPCurrentPeriod: opt.ocsp_current_period = pargs->r.ret_int; break;

    case oMaxReplies: opt.max_replies = pargs->r.ret_int; break;

    case oHkpCaCert:
      {
        /* We need to register the filenames with gnutls (http.c) and
         * also for our own cert cache.  */
        char *tmpname;

        /* Do tilde expansion and make path absolute.  */
        tmpname = make_absfilename (pargs->r.ret_str, NULL);
        http_register_tls_ca (tmpname);
        add_to_strlist (&hkp_cacert_filenames, pargs->r.ret_str);
        xfree (tmpname);
      }
      break;

    case oIgnoreCert:
      {
        fingerprint_list_t item, r;
        item = parse_fingerprint_item (pargs->r.ret_str, "--ignore-cert", 20);
        if (item)
          {  /* Append  */
            if (!opt.ignored_certs)
              opt.ignored_certs = item;
            else
              {
                for (r = opt.ignored_certs; r->next; r = r->next)
                  ;
                r->next = item;
              }
          }
      }
      break;

    case oIgnoreCertExtension:
      add_to_strlist (&opt.ignored_cert_extensions, pargs->r.ret_str);
      break;

    case oIgnoreCRLExtension:
      add_to_strlist (&opt.ignored_crl_extensions, pargs->r.ret_str);
      break;

    case oUseTor:
      tor_mode = TOR_MODE_FORCE;
      break;
    case oNoUseTor:
      if (tor_mode != TOR_MODE_FORCE)
        tor_mode = TOR_MODE_NEVER;
      break;

    case oStandardResolver: enable_standard_resolver (1); break;
    case oRecursiveResolver: enable_recursive_resolver (1); break;

    case oLDAPServer:
#if USE_LDAP
      {
        ldap_server_t server;
        char *p;

        p = pargs->r.ret_str;
        if (!strncmp (p, "ldap:", 5) && !(p[5] == '/' && p[6] == '/'))
          p += 5;

        server = ldapserver_parse_one (p, NULL, 0);
        if (server)
          {
            if (ldapserver_list_needs_reset)
              {
                ldapserver_list_needs_reset = 0;
                ldapserver_list_free (opt.ldapservers);
                opt.ldapservers = NULL;
              }
            server->next = opt.ldapservers;
            opt.ldapservers = server;
          }
      }
#endif
      break;

    case oKeyServer:
      if (*pargs->r.ret_str)
        add_to_strlist (&opt.keyserver, pargs->r.ret_str);
      break;

    case oNameServer:
      set_dns_nameserver (pargs->r.ret_str);
      break;

    case oResolverTimeout:
      set_dns_timeout (pargs->r.ret_int);
      break;

    case oConnectTimeout:
      opt.connect_timeout = pargs->r.ret_ulong * 1000;
      break;

    case oConnectQuickTimeout:
      opt.connect_quick_timeout = pargs->r.ret_ulong * 1000;
      break;

    case oLDAPTimeout:
      opt.ldaptimeout = pargs->r.ret_int;
      break;

    case oDebugCacheExpiredCerts:
      opt.debug_cache_expired_certs = 0;
      break;

    case oFakeCRL:
      xfree (opt.fake_crl);
      opt.fake_crl = *pargs->r.ret_str? xstrdup (pargs->r.ret_str) : NULL;
      break;

    case oCompatibilityFlags:
      if (parse_compatibility_flags (pargs->r.ret_str, &opt.compat_flags,
                                     compatibility_flags))
        {
          pargs->r_opt = ARGPARSE_INVALID_ARG;
          pargs->err = ARGPARSE_PRINT_WARNING;
        }
      break;

    case oUserAgent:
      if (strpbrk (pargs->r.ret_str, "\r\n"))
        ; /* Ignore if the caller tried to insert CR or LF.  */
      else if (!strcmp (pargs->r.ret_str, "none"))
        opt.user_agent = "";
      else
        opt.user_agent = pargs->r.ret_str;
      break;

    default:
      return 0; /* Not handled. */
    }

  set_dns_verbose (opt.verbose, !!DBG_DNS);
  http_set_verbose (opt.verbose, !!DBG_NETWORK);
  set_dns_disable_ipv4 (opt.disable_ipv4);
  set_dns_disable_ipv6 (opt.disable_ipv6);

  return 1; /* Handled. */
}


/* This function is called after option parsing to adjust some values
 * and call option setup functions.  */
static void
post_option_parsing (enum cmd_and_opt_values cmd)
{
  /* It would be too surpirsing if the quick timeout is larger than
   * the standard value.  */
  if (opt.connect_quick_timeout > opt.connect_timeout)
    opt.connect_quick_timeout = opt.connect_timeout;

  set_debug ();
  /* For certain commands we do not want to set/test for Tor mode
   * because that is somewhat expensive.  */
  switch (cmd)
    {
    case aGPGConfList:
    case aGPGConfTest:
    case aGPGConfVersions:
      break;
    default:
      set_tor_mode ();
      break;
    }
}


#ifndef HAVE_W32_SYSTEM
static int
pid_suffix_callback (unsigned long *r_suffix)
{
  union int_and_ptr_u value;

  memset (&value, 0, sizeof value);
  value.aptr = npth_getspecific (my_tlskey_current_fd);
  *r_suffix = value.aint;
  return (*r_suffix != -1);  /* Use decimal representation.  */
}
#endif /*!HAVE_W32_SYSTEM*/

#if HTTP_USE_NTBTLS
static void
my_ntbtls_log_handler (void *opaque, int level, const char *fmt, va_list argv)
{
  (void)opaque;

  if (level == -1)
    log_logv_prefix (GPGRT_LOGLVL_INFO, "ntbtls: ", fmt, argv);
  else
    {
      char prefix[10+20];
      snprintf (prefix, sizeof prefix, "ntbtls(%d): ", level);
      log_logv_prefix (GPGRT_LOGLVL_DEBUG, prefix, fmt, argv);
    }
}
#endif


/* Helper for initialize_modules.  */
static void
dirmngr_thread_init (void)
{
  static int npth_initialized = 0;

  if (!npth_initialized)
    {
      npth_initialized++;
      npth_init ();
      /* With nPth running we can set the logging callback.  Our
       * windows implementation does not yet feature the nPth TLS
       * functions.  */
#ifndef HAVE_W32_SYSTEM
      if (npth_key_create (&my_tlskey_current_fd, NULL) == 0)
        if (npth_setspecific (my_tlskey_current_fd, NULL) == 0)
          log_set_pid_suffix_cb (pid_suffix_callback);
#endif /*!HAVE_W32_SYSTEM*/
      }
  gpgrt_set_syscall_clamp (npth_unprotect, npth_protect);

  /* Now that we have set the syscall clamp we need to tell Libgcrypt
   * that it should get them from libgpg-error.  Note that Libgcrypt
   * has already been initialized but at that point nPth was not
   * initialized and thus Libgcrypt could not set its system call
   * clamp.  */
  gcry_control (GCRYCTL_REINIT_SYSCALL_CLAMP, 0, 0);
  assuan_control (ASSUAN_CONTROL_REINIT_SYSCALL_CLAMP, NULL);
}


static void
initialize_modules (void)
{
  dirmngr_thread_init ();
  cert_cache_init (hkp_cacert_filenames);
  crl_cache_init ();
  ks_hkp_init ();
}



int
main (int argc, char **argv)
{
  enum cmd_and_opt_values cmd = 0;
  gpgrt_argparse_t pargs;
  int orig_argc;
  char **orig_argv;
  char *last_configname = NULL;
  const char *configname = NULL;
  const char *shell;
  int debug_argparser = 0;
  int greeting = 0;
  int nogreeting = 0;
  int nodetach = 0;
  int csh_style = 0;
  char *logfile = NULL;
#if USE_LDAP
  char *ldapfile = NULL;
#endif /*USE_LDAP*/
  int debug_wait = 0;
  int rc;
  struct assuan_malloc_hooks malloc_hooks;

  early_system_init ();
  gpgrt_set_strusage (my_strusage);
  log_set_prefix (DIRMNGR_NAME, GPGRT_LOG_WITH_PREFIX | GPGRT_LOG_WITH_PID);

  /* Make sure that our subsystems are ready.  */
  i18n_init ();
  init_common_subsystems (&argc, &argv);

  gcry_control (GCRYCTL_DISABLE_SECMEM, 0);

 /* Check that the libraries are suitable.  Do it here because
    the option parsing may need services of the libraries. */
  if (!ksba_check_version (NEED_KSBA_VERSION) )
    log_fatal( _("%s is too old (need %s, have %s)\n"), "libksba",
               NEED_KSBA_VERSION, ksba_check_version (NULL) );

  ksba_set_malloc_hooks (gcry_malloc, gcry_realloc, gcry_free );
  ksba_set_hash_buffer_function (my_ksba_hash_buffer, NULL);

  /* Init TLS library.  */
#if HTTP_USE_NTBTLS
  if (!ntbtls_check_version (NEED_NTBTLS_VERSION) )
    log_fatal( _("%s is too old (need %s, have %s)\n"), "ntbtls",
               NEED_NTBTLS_VERSION, ntbtls_check_version (NULL) );
#elif HTTP_USE_GNUTLS
  rc = gnutls_global_init ();
  if (rc)
    log_fatal ("gnutls_global_init failed: %s\n", gnutls_strerror (rc));
#endif /*HTTP_USE_GNUTLS*/

  /* Init Assuan. */
  malloc_hooks.malloc = gcry_malloc;
  malloc_hooks.realloc = gcry_realloc;
  malloc_hooks.free = gcry_free;
  assuan_set_malloc_hooks (&malloc_hooks);
  assuan_set_assuan_log_prefix (log_get_prefix (NULL));
  assuan_set_gpg_err_source (GPG_ERR_SOURCE_DEFAULT);
  assuan_sock_init ();
  setup_libassuan_logging (&opt.debug, dirmngr_assuan_log_monitor);

  setup_libgcrypt_logging ();

#if HTTP_USE_NTBTLS
  ntbtls_set_log_handler (my_ntbtls_log_handler, NULL);
#endif

  /* Setup defaults. */
  shell = getenv ("SHELL");
  if (shell && strlen (shell) >= 3 && !strcmp (shell+strlen (shell)-3, "csh") )
    csh_style = 1;

  /* Reset rereadable options to default values. */
  parse_rereadable_options (NULL, 0);

  /* Default TCP timeouts.  */
  opt.connect_timeout = DEFAULT_CONNECT_TIMEOUT;
  opt.connect_quick_timeout = DEFAULT_CONNECT_QUICK_TIMEOUT;

  /* LDAP defaults.  */
  opt.add_new_ldapservers = 0;
  opt.ldaptimeout = DEFAULT_LDAP_TIMEOUT;

  /* Other defaults.  */

  /* Check whether we have a config file given on the commandline */
  orig_argc = argc;
  orig_argv = argv;
  pargs.argc = &argc;
  pargs.argv = &argv;
  pargs.flags= (ARGPARSE_FLAG_KEEP | ARGPARSE_FLAG_NOVERSION);
  while (gpgrt_argparse (NULL, &pargs, opts))
    {
      switch (pargs.r_opt)
        {
        case oDebug:
        case oDebugAll:
          debug_argparser++;
          break;
        case oHomedir:
          gnupg_set_homedir (pargs.r.ret_str);
          break;
        }
    }
  /* Reset the flags.  */
  pargs.flags &= ~(ARGPARSE_FLAG_KEEP | ARGPARSE_FLAG_NOVERSION);

  socket_name = dirmngr_socket_name ();

  /* The configuration directories for use by gpgrt_argparser.  */
  gpgrt_set_confdir (GPGRT_CONFDIR_SYS, gnupg_sysconfdir ());
  gpgrt_set_confdir (GPGRT_CONFDIR_USER, gnupg_homedir ());

  /* We are re-using the struct, thus the reset flag.  We OR the
   * flags so that the internal initialized flag won't be cleared. */
  argc = orig_argc;
  argv = orig_argv;
  pargs.argc = &argc;
  pargs.argv = &argv;
  pargs.flags |=  (ARGPARSE_FLAG_RESET
                   | ARGPARSE_FLAG_KEEP
                   | ARGPARSE_FLAG_SYS
                   | ARGPARSE_FLAG_USER);
  while (gpgrt_argparser (&pargs, opts, DIRMNGR_NAME EXTSEP_S "conf"))
    {
      if (pargs.r_opt == ARGPARSE_CONFFILE)
        {
          if (debug_argparser)
            log_info (_("reading options from '%s'\n"),
                      pargs.r_type? pargs.r.ret_str: "[cmdline]");
          if (pargs.r_type)
            {
              xfree (last_configname);
              last_configname = xstrdup (pargs.r.ret_str);
              configname = last_configname;
            }
          else
            configname = NULL;
          continue;
        }
      if (parse_rereadable_options (&pargs, 0))
        continue; /* Already handled */
      switch (pargs.r_opt)
        {
        case aServer:
        case aDaemon:
        case aSupervised:
        case aShutdown:
        case aFlush:
	case aListCRLs:
	case aLoadCRL:
        case aFetchCRL:
	case aGPGConfList:
	case aGPGConfTest:
	case aGPGConfVersions:
          cmd = pargs.r_opt;
          break;

        case oQuiet: opt.quiet = 1; break;
        case oVerbose: opt.verbose++; break;
        case oBatch: opt.batch=1; break;

        case oDebugWait: debug_wait = pargs.r.ret_int; break;

        case oNoGreeting: nogreeting = 1; break;
        case oNoVerbose: opt.verbose = 0; break;
        case oHomedir: /* Ignore this option here. */; break;
        case oNoDetach: nodetach = 1; break;
        case oStealSocket: steal_socket = 1; break;
        case oLogFile: logfile = pargs.r.ret_str; break;
        case oCsh: csh_style = 1; break;
        case oSh: csh_style = 0; break;
	case oLDAPFile:
#        if USE_LDAP
          ldapfile = pargs.r.ret_str;
#        endif /*USE_LDAP*/
          break;
	case oLDAPAddServers: opt.add_new_ldapservers = 1; break;

        case oFakedSystemTime:
          {
            time_t faked_time = isotime2epoch (pargs.r.ret_str);
            if (faked_time == (time_t)(-1))
              faked_time = (time_t)strtoul (pargs.r.ret_str, NULL, 10);
            gnupg_set_time (faked_time, 0);
          }
          break;

        case oForce: opt.force = 1; break;

        case oSocketName: socket_name = pargs.r.ret_str; break;

        case oListenBacklog:
          listen_backlog = pargs.r.ret_int;
          break;

        default:
          if (configname)
            pargs.err = ARGPARSE_PRINT_WARNING;
          else
            pargs.err = ARGPARSE_PRINT_ERROR;
          break;
	}
    }
  gpgrt_argparse (NULL, &pargs, NULL);  /* Release internal state.  */

  if (!last_configname)
    opt.config_filename = gpgrt_fnameconcat (gnupg_homedir (),
                                             DIRMNGR_NAME EXTSEP_S "conf",
                                             NULL);
  else
    {
      opt.config_filename = last_configname;
      last_configname = NULL;
    }

  if (log_get_errorcount(0))
    exit(2);

  /* Get a default log file from common.conf.  */
  if (!logfile && !parse_comopt (GNUPG_MODULE_NAME_DIRMNGR, debug_argparser))
    {
      logfile = comopt.logfile;
      comopt.logfile = NULL;
    }

  if (nogreeting )
    greeting = 0;

  if (!opt.homedir_cache)
    opt.homedir_cache = xstrdup (gnupg_homedir ());

  if (greeting)
    {
      es_fprintf (es_stderr, "%s %s; %s\n",
                  gpgrt_strusage(11), gpgrt_strusage(13), gpgrt_strusage(14));
      es_fprintf (es_stderr, "%s\n", gpgrt_strusage(15));
    }

#ifdef IS_DEVELOPMENT_VERSION
  log_info ("NOTE: this is a development version!\n");
#endif

  /* Print a warning if an argument looks like an option.  */
  if (!opt.quiet && !(pargs.flags & ARGPARSE_FLAG_STOP_SEEN))
    {
      int i;

      for (i=0; i < argc; i++)
        if (argv[i][0] == '-' && argv[i][1] == '-')
          log_info (_("Note: '%s' is not considered an option\n"), argv[i]);
    }

  if (!gnupg_access ("/etc/"DIRMNGR_NAME, F_OK)
      && !strncmp (gnupg_homedir (), "/etc/", 5))
    log_info
      ("NOTE: DirMngr is now a proper part of %s.  The configuration and"
       " other directory names changed.  Please check that no other version"
       " of dirmngr is still installed.  To disable this warning, remove the"
       " directory '/etc/dirmngr'.\n", GNUPG_NAME);

  if (gnupg_faked_time_p ())
    {
      gnupg_isotime_t tbuf;

      log_info (_("WARNING: running with faked system time: "));
      gnupg_get_isotime (tbuf);
      dump_isotime (tbuf);
      log_printf ("\n");
    }

  post_option_parsing (cmd);

  /* Get LDAP server list from file unless --ldapserver has been used.  */
#if USE_LDAP
  if (opt.ldapservers)
    ;
  else if (!ldapfile)
    {
      ldapfile = make_filename (gnupg_homedir (),
                                "dirmngr_ldapservers.conf",
                                NULL);
      opt.ldapservers = parse_ldapserver_file (ldapfile, 1);
      xfree (ldapfile);
    }
  else
    opt.ldapservers = parse_ldapserver_file (ldapfile, 0);
#endif /*USE_LDAP*/

#ifndef HAVE_W32_SYSTEM
  /* We need to ignore the PIPE signal because the we might log to a
     socket and that code handles EPIPE properly.  The ldap wrapper
     also requires us to ignore this silly signal. Assuan would set
     this signal to ignore anyway.*/
  signal (SIGPIPE, SIG_IGN);
#endif

  /* Ready.  Now to our duties. */
  if (!cmd)
    cmd = aServer;
  rc = 0;

  if (cmd == aServer)
    {
      /* Note that this server mode is mainly useful for debugging.  */
      if (argc)
        wrong_args ("--server");

      if (logfile)
        {
          log_set_file (logfile);
          log_set_prefix (NULL, GPGRT_LOG_WITH_TIME | GPGRT_LOG_WITH_PID);
        }

      if (debug_wait)
        {
          log_debug ("waiting for debugger - my pid is %u .....\n",
                     (unsigned int)getpid());
          gnupg_sleep (debug_wait);
          log_debug ("... okay\n");
        }

      initialize_modules ();
      http_register_netactivity_cb (netactivity_action);

      start_command_handler (ASSUAN_INVALID_FD, 0);
      shutdown_reaper ();
    }
#ifndef HAVE_W32_SYSTEM
  else if (cmd == aSupervised)
    {
      struct stat statbuf;

      is_supervised = 1;

      /* In supervised mode, we expect file descriptor 3 to be an
         already opened, listening socket.

         We will also not detach from the controlling process or close
         stderr; the supervisor should handle all of that.  */
      if (fstat (3, &statbuf) == -1 && errno == EBADF)
        {
          log_error ("file descriptor 3 must be validin --supervised mode\n");
          dirmngr_exit (1);
        }
      socket_name = gnupg_get_socket_name (3);

      /* Now start with logging to a file if this is desired. */
      if (logfile)
        {
          log_set_file (logfile);
          log_set_prefix (NULL, (GPGRT_LOG_WITH_PREFIX
                                 |GPGRT_LOG_WITH_TIME
                                 |GPGRT_LOG_WITH_PID));
          current_logfile = xstrdup (logfile);
        }
      else
        log_set_prefix (NULL, 0);

      initialize_modules ();
      http_register_netactivity_cb (netactivity_action);
      handle_connections (3);
      shutdown_reaper ();
    }
#endif /*HAVE_W32_SYSTEM*/
  else if (cmd == aDaemon)
    {
      assuan_fd_t fd;
      pid_t pid;
      int len;
      struct sockaddr_un serv_addr;

      if (argc)
        wrong_args ("--daemon");

      /* Now start with logging to a file if this is desired. */
      if (logfile)
        {
          log_set_file (logfile);
          log_set_prefix (NULL, (GPGRT_LOG_WITH_PREFIX
                                 |GPGRT_LOG_WITH_TIME
                                 |GPGRT_LOG_WITH_PID));
          current_logfile = xstrdup (logfile);
        }

      if (debug_wait)
        {
          log_debug ("waiting for debugger - my pid is %u .....\n",
                     (unsigned int)getpid());
          gnupg_sleep (debug_wait);
          log_debug ("... okay\n");
        }

#ifndef HAVE_W32_SYSTEM
      if (strchr (socket_name, ':'))
        {
          log_error (_("colons are not allowed in the socket name\n"));
          dirmngr_exit (1);
        }
#endif
      fd = assuan_sock_new (AF_UNIX, SOCK_STREAM, 0);
      if (fd == ASSUAN_INVALID_FD)
        {
          log_error (_("can't create socket: %s\n"), strerror (errno));
          cleanup ();
          dirmngr_exit (1);
        }

      {
        int redirected;

        if (assuan_sock_set_sockaddr_un (socket_name,
                                         (struct sockaddr*)&serv_addr,
                                         &redirected))
          {
            if (errno == ENAMETOOLONG)
              log_error (_("socket name '%s' is too long\n"), socket_name);
            else
              log_error ("error preparing socket '%s': %s\n",
                         socket_name,
                         gpg_strerror (gpg_error_from_syserror ()));
            dirmngr_exit (1);
          }
        if (redirected)
          {
            redir_socket_name = xstrdup (serv_addr.sun_path);
            if (opt.verbose)
              log_info ("redirecting socket '%s' to '%s'\n",
                        socket_name, redir_socket_name);
          }
      }

      len = SUN_LEN (&serv_addr);

      rc = assuan_sock_bind (fd, (struct sockaddr*) &serv_addr, len);
      if (rc == -1
          && (errno == EADDRINUSE
#ifdef HAVE_W32_SYSTEM
              || errno == EEXIST
#endif
              ))
	{
          /* Fixme: We should actually test whether a dirmngr is
           * already running.  For now the steal option is a dummy. */
          /* if (steal_socket) */
          /*   log_info (N_("trying to steal socket from running %s\n"), */
          /*             "dirmngr"); */
	  gnupg_remove (redir_socket_name? redir_socket_name : socket_name);
	  rc = assuan_sock_bind (fd, (struct sockaddr*) &serv_addr, len);
	}
      if (rc != -1
	  && (rc = assuan_sock_get_nonce ((struct sockaddr*) &serv_addr, len, &socket_nonce)))
	log_error (_("error getting nonce for the socket\n"));
      if (rc == -1)
        {
          log_libassuan_system_error (fd);
          log_error (_("error binding socket to '%s': %s\n"),
                     serv_addr.sun_path,
                     gpg_strerror (gpg_error_from_syserror ()));
          assuan_sock_close (fd);
          dirmngr_exit (1);
        }
      cleanup_socket = 1;

      if (gnupg_chmod (serv_addr.sun_path, "-rwx"))
        log_error (_("can't set permissions of '%s': %s\n"),
                   serv_addr.sun_path, strerror (errno));

      if (listen (FD2INT (fd), listen_backlog) == -1)
        {
          log_error ("listen(fd,%d) failed: %s\n",
                     listen_backlog, strerror (errno));
          assuan_sock_close (fd);
          dirmngr_exit (1);
        }

      if (opt.verbose)
        log_info (_("listening on socket '%s'\n"), serv_addr.sun_path);

      es_fflush (NULL);

      /* Note: We keep the dirmngr_info output only for the sake of
         existing scripts which might use this to detect a successful
         start of the dirmngr.  */
#ifdef HAVE_W32_SYSTEM
      (void)csh_style;
      (void)nodetach;

      pid = getpid ();
      es_printf ("set %s=%s;%lu;1\n",
                 DIRMNGR_INFO_NAME, socket_name, (ulong) pid);
      w32_ack_to_frontend ();
#else
      pid = fork();
      if (pid == (pid_t)-1)
        {
          log_fatal (_("error forking process: %s\n"), strerror (errno));
          dirmngr_exit (1);
        }

      if (pid)
        { /* We are the parent */
          char *infostr;

          /* Don't let cleanup() remove the socket - the child is
             responsible for doing that.  */
          cleanup_socket = 0;

          close (fd);

          /* Create the info string: <name>:<pid>:<protocol_version> */
          if (asprintf (&infostr, "%s=%s:%lu:1",
                        DIRMNGR_INFO_NAME, serv_addr.sun_path, (ulong)pid ) < 0)
            {
              log_error (_("out of core\n"));
              kill (pid, SIGTERM);
              dirmngr_exit (1);
            }
          /* Print the environment string, so that the caller can use
             shell's eval to set it.  But see above.  */
          if (csh_style)
            {
              *strchr (infostr, '=') = ' ';
              es_printf ( "setenv %s;\n", infostr);
            }
          else
            {
              es_printf ( "%s; export %s;\n", infostr, DIRMNGR_INFO_NAME);
            }
          free (infostr);
          exit (0);
          /*NEVER REACHED*/
        } /* end parent */


      /*
         This is the child
       */

      /* Detach from tty and put process into a new session */
      if (!nodetach )
        {
          int i;
          unsigned int oldflags;

          /* Close stdin, stdout and stderr unless it is the log stream */
          for (i=0; i <= 2; i++)
            {
              if (!log_test_fd (i) && i != fd )
                {
                  if ( !close (i)
                       && open ("/dev/null", i? O_WRONLY : O_RDONLY) == -1)
                    {
                      log_error ("failed to open '%s': %s\n",
                                 "/dev/null", strerror (errno));
                      cleanup ();
                      dirmngr_exit (1);
                    }
                }
            }

          if (setsid() == -1)
            {
              log_error ("setsid() failed: %s\n", strerror(errno) );
              dirmngr_exit (1);
            }

          log_get_prefix (&oldflags);
          log_set_prefix (NULL, oldflags | GPGRT_LOG_RUN_DETACHED);
          opt.running_detached = 1;

        }
#endif

      if (!nodetach )
        {
          if (gnupg_chdir (gnupg_daemon_rootdir ()))
            {
              log_error ("chdir to '%s' failed: %s\n",
                         gnupg_daemon_rootdir (), strerror (errno));
              dirmngr_exit (1);
            }
        }

      initialize_modules ();
      http_register_netactivity_cb (netactivity_action);

      handle_connections (fd);
      shutdown_reaper ();
    }
  else if (cmd == aListCRLs)
    {
      /* Just list the CRL cache and exit. */
      if (argc)
        wrong_args ("--list-crls");
      crl_cache_init ();
      crl_cache_list (es_stdout);
    }
  else if (cmd == aLoadCRL)
    {
      struct server_control_s ctrlbuf;

      memset (&ctrlbuf, 0, sizeof ctrlbuf);
      dirmngr_init_default_ctrl (&ctrlbuf);

      initialize_modules ();

      if (!argc)
        rc = crl_cache_load (&ctrlbuf, NULL);
      else
        {
          for (; !rc && argc; argc--, argv++)
            rc = crl_cache_load (&ctrlbuf, *argv);
        }
      dirmngr_deinit_default_ctrl (&ctrlbuf);
    }
  else if (cmd == aFetchCRL)
    {
      ksba_reader_t reader;
      struct server_control_s ctrlbuf;

      if (argc != 1)
        wrong_args ("--fetch-crl URL");

      memset (&ctrlbuf, 0, sizeof ctrlbuf);
      dirmngr_init_default_ctrl (&ctrlbuf);

      initialize_modules ();

      rc = crl_fetch (&ctrlbuf, argv[0], &reader);
      if (rc)
        log_error (_("fetching CRL from '%s' failed: %s\n"),
                     argv[0], gpg_strerror (rc));
      else
        {
          rc = crl_cache_insert (&ctrlbuf, argv[0], reader);
          if (rc)
            log_error (_("processing CRL from '%s' failed: %s\n"),
                       argv[0], gpg_strerror (rc));
          crl_close_reader (reader);
        }
      dirmngr_deinit_default_ctrl (&ctrlbuf);
    }
  else if (cmd == aFlush)
    {
      /* Delete cache and exit. */
      if (argc)
        wrong_args ("--flush");
      rc = crl_cache_flush();
    }
  else if (cmd == aGPGConfTest)
    dirmngr_exit (0);
  else if (cmd == aGPGConfList)
    {
      unsigned long flags = 0;
      char *filename_esc;

      es_printf ("debug-level:%lu:\"none\n", flags | GC_OPT_FLAG_DEFAULT);
      es_printf ("ldaptimeout:%lu:%u\n",
                 flags | GC_OPT_FLAG_DEFAULT, DEFAULT_LDAP_TIMEOUT);
      es_printf ("max-replies:%lu:%u\n",
                 flags | GC_OPT_FLAG_DEFAULT, DEFAULT_MAX_REPLIES);

      filename_esc = percent_escape (get_default_keyserver (0), NULL);
      es_printf ("keyserver:%lu:\"%s:\n", flags | GC_OPT_FLAG_DEFAULT,
                 filename_esc);
      xfree (filename_esc);

      es_printf ("resolver-timeout:%lu:%u\n",
                 flags | GC_OPT_FLAG_DEFAULT, 0);
    }
  else if (cmd == aGPGConfVersions)
    gpgconf_versions ();

  cleanup ();
  return !!rc;
}


static void
cleanup (void)
{
  crl_cache_deinit ();
  cert_cache_deinit (1);
  reload_dns_stuff (1);

#if USE_LDAP
  ldapserver_list_free (opt.ldapservers);
#endif /*USE_LDAP*/
  opt.ldapservers = NULL;

  if (cleanup_socket)
    {
      cleanup_socket = 0;
      if (redir_socket_name)
        gnupg_remove (redir_socket_name);
      else if (socket_name && *socket_name)
        gnupg_remove (socket_name);
    }
}


void
dirmngr_exit (int rc)
{
  cleanup ();
  exit (rc);
}


void
dirmngr_init_default_ctrl (ctrl_t ctrl)
{
  ctrl->magic = SERVER_CONTROL_MAGIC;
  if (opt.http_proxy)
    ctrl->http_proxy = xstrdup (opt.http_proxy);
  ctrl->http_no_crl = 1;
  ctrl->timeout = opt.connect_timeout;
}


void
dirmngr_deinit_default_ctrl (ctrl_t ctrl)
{
  if (!ctrl)
    return;
  ctrl->magic = 0xdeadbeef;

  xfree (ctrl->http_proxy);
  ctrl->http_proxy = NULL;
  nvc_release (ctrl->rootdse);
  ctrl->rootdse = NULL;
}


/* Create a list of LDAP servers from the file FILENAME. Returns the
   list or NULL in case of errors.

   The format of such a file is line oriented where empty lines and
   lines starting with a hash mark are ignored.  All other lines are
   assumed to be colon separated with these fields:

   1. field: Hostname
   2. field: Portnumber
   3. field: Username
   4. field: Password
   5. field: Base DN

*/
#if USE_LDAP
static ldap_server_t
parse_ldapserver_file (const char* filename, int ignore_enoent)
{
  char buffer[1024];
  char *p;
  ldap_server_t server, serverstart, *serverend;
  int c;
  unsigned int lineno = 0;
  estream_t fp;

  fp = es_fopen (filename, "r");
  if (!fp)
    {
      if (ignore_enoent && gpg_err_code_from_syserror () == GPG_ERR_ENOENT)
        ;
      else
        log_info ("failed to open '%s': %s\n", filename, strerror (errno));
      return NULL;
    }

  serverstart = NULL;
  serverend = &serverstart;
  while (es_fgets (buffer, sizeof buffer, fp))
    {
      lineno++;
      if (!*buffer || buffer[strlen(buffer)-1] != '\n')
        {
          if (*buffer && es_feof (fp))
            ; /* Last line not terminated - continue. */
          else
            {
              log_error (_("%s:%u: line too long - skipped\n"),
                         filename, lineno);
              while ( (c=es_fgetc (fp)) != EOF && c != '\n')
                ; /* Skip until end of line. */
              continue;
            }
        }
      /* Skip empty and comment lines.*/
      for (p=buffer; spacep (p); p++)
        ;
      if (!*p || *p == '\n' || *p == '#')
        continue;

      /* Parse the colon separated fields. */
      server = ldapserver_parse_one (buffer, filename, lineno);
      if (server)
        {
          *serverend = server;
          serverend = &server->next;
        }
    }

  if (es_ferror (fp))
    log_error (_("error reading '%s': %s\n"), filename, strerror (errno));
  es_fclose (fp);

  return serverstart;
}
#endif /*USE_LDAP*/


/* Parse a fingerprint entry as used by --ocsc-signer.  OPTIONNAME as
 * a description on the options used.  WANT_BINARY requests to store a
 * binary fingerprint.  Returns NULL on error and logs that error. */
static fingerprint_list_t
parse_fingerprint_item (const char *string,
                        const char *optionname, int want_binary)
{
  gpg_error_t err;
  char *fname;
  estream_t fp;
  char line[256];
  char *p;
  fingerprint_list_t list, *list_tail, item;
  unsigned int lnr = 0;
  int c, i, j;
  int errflag = 0;


  /* Check whether this is not a filename and treat it as a direct
     fingerprint specification.  */
  if (!strpbrk (string, "/.~\\"))
    {
      item = xcalloc (1, sizeof *item);
      for (i=j=0; (string[i] == ':' || hexdigitp (string+i)) && j < 40; i++)
        if ( string[i] != ':' )
          item->hexfpr[j++] = string[i] >= 'a'? (string[i] & 0xdf): string[i];
      item->hexfpr[j] = 0;
      if (j != 40 || !(spacep (string+i) || !string[i]))
        {
          log_error (_("%s:%u: invalid fingerprint detected\n"),
                     optionname, 0);
          xfree (item);
          return NULL;
        }
      if (want_binary)
        {
          item->binlen = 20;
          hex2bin (item->hexfpr, item->hexfpr, 20);
        }
      return item;
    }

  /* Well, it is a filename.  */
  if (*string == '/' || (*string == '~' && string[1] == '/'))
    fname = make_filename (string, NULL);
  else
    {
      if (string[0] == '.' && string[1] == '/' )
        string += 2;
      fname = make_filename (gnupg_homedir (), string, NULL);
    }

  fp = es_fopen (fname, "r");
  if (!fp)
    {
      err = gpg_error_from_syserror ();
      log_error (_("can't open '%s': %s\n"), fname, gpg_strerror (err));
      xfree (fname);
      return NULL;
    }

  list = NULL;
  list_tail = &list;
  for (;;)
    {
      if (!es_fgets (line, DIM(line)-1, fp) )
        {
          if (!es_feof (fp))
            {
              err = gpg_error_from_syserror ();
              log_error (_("%s:%u: read error: %s\n"),
                         fname, lnr, gpg_strerror (err));
              errflag = 1;
            }
          es_fclose (fp);
          if (errflag)
            {
              while (list)
                {
                  fingerprint_list_t tmp = list->next;
                  xfree (list);
                  list = tmp;
                }
            }
          xfree (fname);
          return list; /* Ready.  */
        }

      lnr++;
      if (!*line || line[strlen(line)-1] != '\n')
        {
          /* Eat until end of line. */
          while ( (c=es_getc (fp)) != EOF && c != '\n')
            ;
          err = gpg_error (*line? GPG_ERR_LINE_TOO_LONG
                           /* */: GPG_ERR_INCOMPLETE_LINE);
          log_error (_("%s:%u: read error: %s\n"),
                     fname, lnr, gpg_strerror (err));
          errflag = 1;
          continue;
        }

      /* Allow for empty lines and spaces */
      for (p=line; spacep (p); p++)
        ;
      if (!*p || *p == '\n' || *p == '#')
        continue;

      item = xcalloc (1, sizeof *item);
      *list_tail = item;
      list_tail = &item->next;

      for (i=j=0; (p[i] == ':' || hexdigitp (p+i)) && j < 40; i++)
        if ( p[i] != ':' )
          item->hexfpr[j++] = p[i] >= 'a'? (p[i] & 0xdf): p[i];
      item->hexfpr[j] = 0;
      if (j != 40 || !(spacep (p+i) || p[i] == '\n'))
        {
          log_error (_("%s:%u: invalid fingerprint detected\n"), fname, lnr);
          errflag = 1;
        }
      else if (want_binary)
        {
          item->binlen = 20;
          hex2bin (item->hexfpr, item->hexfpr, 20);
        }

      i++;
      while (spacep (p+i))
        i++;
      if (p[i] && p[i] != '\n')
        log_info (_("%s:%u: garbage at end of line ignored\n"), fname, lnr);
    }
  /*NOTREACHED*/
}




/*
   Stuff used in daemon mode.
 */



/* Reread parts of the configuration.  Note, that this function is
   obviously not thread-safe and should only be called from the NPTH
   signal handler.

   Fixme: Due to the way the argument parsing works, we create a
   memory leak here for all string type arguments.  There is currently
   no clean way to tell whether the memory for the argument has been
   allocated or points into the process's original arguments.  Unless
   we have a mechanism to tell this, we need to live on with this. */
static void
reread_configuration (void)
{
  gpgrt_argparse_t pargs;
  char *twopart;
  int dummy;
  int logfile_seen = 0;

  if (!opt.config_filename)
    goto finish; /* No config file. */

  twopart = strconcat (DIRMNGR_NAME EXTSEP_S "conf" PATHSEP_S,
                       opt.config_filename, NULL);
  if (!twopart)
    return;  /* Out of core.  */

  parse_rereadable_options (NULL, 1); /* Start from the default values. */

  memset (&pargs, 0, sizeof pargs);
  dummy = 0;
  pargs.argc = &dummy;
  pargs.flags = (ARGPARSE_FLAG_KEEP
                 |ARGPARSE_FLAG_SYS
                 |ARGPARSE_FLAG_USER);
  while (gpgrt_argparser (&pargs, opts, twopart))
    {
      if (pargs.r_opt == ARGPARSE_CONFFILE)
        {
          log_info (_("reading options from '%s'\n"),
                    pargs.r_type? pargs.r.ret_str: "[cmdline]");
        }
      else if (pargs.r_opt < -1)
        pargs.err = ARGPARSE_PRINT_WARNING;
      else /* Try to parse this option - ignore unchangeable ones. */
        {
          if (pargs.r_opt == oLogFile)
            logfile_seen = 1;
          parse_rereadable_options (&pargs, 1);
        }
    }
  gpgrt_argparse (NULL, &pargs, NULL);  /* Release internal state.  */
  xfree (twopart);
  post_option_parsing (0);

 finish:
  /* Get a default log file from common.conf.  */
  if (!logfile_seen && !parse_comopt (GNUPG_MODULE_NAME_DIRMNGR, !!opt.debug))
    {
      if (!current_logfile || !comopt.logfile
          || strcmp (current_logfile, comopt.logfile))
        {
          log_set_file (comopt.logfile);
          xfree (current_logfile);
          current_logfile = comopt.logfile? xtrystrdup (comopt.logfile) : NULL;
        }
    }
}


/* A global function which allows us to trigger the reload stuff from
   other places.  */
void
dirmngr_sighup_action (void)
{
  log_info (_("SIGHUP received - "
              "re-reading configuration and flushing caches\n"));
  reread_configuration ();
  set_tor_mode ();
  cert_cache_deinit (0);
  crl_cache_deinit ();
  cert_cache_init (hkp_cacert_filenames);
  crl_cache_init ();
  http_reinitialize ();
  reload_dns_stuff (0);
  ks_hkp_reload ();
}


/* This function is called if some network activity was done.  At this
 * point we know the we have a network and we can decide whether to
 * run scheduled background tasks soon.  The function should return
 * quickly and only trigger actions for another thread. */
static void
netactivity_action (void)
{
  network_activity_seen = 1;
}


/* The signal handler. */
#ifndef HAVE_W32_SYSTEM
static void
handle_signal (int signo)
{
  switch (signo)
    {
    case SIGHUP:
      dirmngr_sighup_action ();
      break;

    case SIGUSR1:
      /* See also cmd_getinfo:"stats".  */
      cert_cache_print_stats (NULL);
      domaininfo_print_stats (NULL);
      break;

    case SIGUSR2:
      log_info (_("SIGUSR2 received - no action defined\n"));
      break;

    case SIGTERM:
      if (!shutdown_pending)
        log_info (_("SIGTERM received - shutting down ...\n"));
      else
        log_info (_("SIGTERM received - still %d active connections\n"),
                  active_connections);
      shutdown_pending++;
      if (shutdown_pending > 2)
        {
          log_info (_("shutdown forced\n"));
          log_info ("%s %s stopped\n", gpgrt_strusage(11), gpgrt_strusage(13));
          cleanup ();
          dirmngr_exit (0);
	}
      break;

    case SIGINT:
      log_info (_("SIGINT received - immediate shutdown\n"));
      log_info( "%s %s stopped\n", gpgrt_strusage(11), gpgrt_strusage(13));
      cleanup ();
      dirmngr_exit (0);
      break;

    default:
      log_info (_("signal %d received - no action defined\n"), signo);
    }
}
#endif /*!HAVE_W32_SYSTEM*/


/* Thread to do the housekeeping.  */
static void *
housekeeping_thread (void *arg)
{
  static int sentinel;
  time_t curtime;
  struct server_control_s ctrlbuf;

  (void)arg;

  curtime = gnupg_get_time ();
  if (sentinel)
    {
      log_info ("housekeeping is already going on\n");
      return NULL;
    }
  sentinel++;
  if (opt.verbose > 1)
    log_info ("starting housekeeping\n");

  memset (&ctrlbuf, 0, sizeof ctrlbuf);
  dirmngr_init_default_ctrl (&ctrlbuf);

  dns_stuff_housekeeping ();
  ks_hkp_housekeeping (curtime);
  if (network_activity_seen)
    {
      network_activity_seen = 0;
      if (opt.allow_version_check)
        dirmngr_load_swdb (&ctrlbuf, 0);
      workqueue_run_global_tasks (&ctrlbuf, 1);
    }
  else
    workqueue_run_global_tasks (&ctrlbuf, 0);

  dirmngr_deinit_default_ctrl (&ctrlbuf);

  if (opt.verbose > 1)
    log_info ("ready with housekeeping\n");
  sentinel--;
  return NULL;

}


/* We try to enable correct overflow handling for signed int (commonly
 * used for time_t). With gcc 4.2 -fno-strict-overflow was introduced
 * and used here as a pragma.  Later gcc versions (gcc 6?) removed
 * this as a pragma and -fwrapv was then suggested as a replacement
 * for -fno-strict-overflow.  */
#if GPGRT_HAVE_PRAGMA_GCC_PUSH
# pragma GCC push_options
# pragma GCC optimize ("wrapv")
#endif
static int
time_for_housekeeping_p (time_t curtime)
{
  static time_t last_housekeeping;

  if (!last_housekeeping)
    last_housekeeping = curtime;

  if (last_housekeeping + HOUSEKEEPING_INTERVAL <= curtime
      || last_housekeeping > curtime /*(be prepared for y2038)*/)
    {
      last_housekeeping = curtime;
      return 1;
    }
  return 0;
}
#if GPGRT_HAVE_PRAGMA_GCC_PUSH
# pragma GCC pop_options
#endif


/* This is the worker for the ticker.  It is called every few seconds
   and may only do fast operations. */
static void
handle_tick (void)
{
  struct stat statbuf;

  if (time_for_housekeeping_p (gnupg_get_time ()))
    {
      npth_t thread;
      npth_attr_t tattr;
      int err;

      err = npth_attr_init (&tattr);
      if (err)
        log_error ("error preparing housekeeping thread: %s\n", strerror (err));
      else
        {
          npth_attr_setdetachstate (&tattr, NPTH_CREATE_DETACHED);
          err = npth_create (&thread, &tattr, housekeeping_thread, NULL);
          if (err)
            log_error ("error spawning housekeeping thread: %s\n",
                       strerror (err));
          npth_attr_destroy (&tattr);
        }
    }

  /* Check whether the homedir is still available.  */
  if (!shutdown_pending
      && gnupg_stat (gnupg_homedir (), &statbuf) && errno == ENOENT)
    {
      shutdown_pending = 1;
      log_info ("homedir has been removed - shutting down\n");
    }
}


/* Check the nonce on a new connection.  This is a NOP unless we are
   using our Unix domain socket emulation under Windows.  */
static int
check_nonce (assuan_fd_t fd, assuan_sock_nonce_t *nonce)
{
  if (assuan_sock_check_nonce (fd, nonce))
    {
      log_info (_("error reading nonce on fd %d: %s\n"),
                FD_DBG (fd), strerror (errno));
      assuan_sock_close (fd);
      return -1;
    }
  else
    return 0;
}


/* Helper to call a connection's main function. */
static void *
start_connection_thread (void *arg)
{
  static unsigned int last_session_id;
  unsigned int session_id;
  union int_and_ptr_u argval;
  gnupg_fd_t fd;

  memset (&argval, 0, sizeof argval);
  argval.aptr = arg;
  fd = argval.afd;

  if (check_nonce (fd, &socket_nonce))
    {
      log_error ("handler nonce check FAILED\n");
      return NULL;
    }

#ifndef HAVE_W32_SYSTEM
  npth_setspecific (my_tlskey_current_fd, argval.aptr);
#endif

  active_connections++;
  if (opt.verbose)
    log_info (_("handler for fd %d started\n"), FD_DBG (fd));

  session_id = ++last_session_id;
  if (!session_id)
    session_id = ++last_session_id;
  start_command_handler (fd, session_id);

  if (opt.verbose)
    log_info (_("handler for fd %d terminated\n"), FD_DBG (fd));
  active_connections--;

  workqueue_run_post_session_tasks (session_id);

#ifndef HAVE_W32_SYSTEM
  argval.afd = ASSUAN_INVALID_FD;
  npth_setspecific (my_tlskey_current_fd, argval.aptr);
#endif

  return NULL;
}


#ifdef HAVE_INOTIFY_INIT
/* Read an inotify event and return true if it matches NAME.  */
static int
my_inotify_is_name (int fd, const char *name)
{
  union {
    struct inotify_event ev;
    char _buf[sizeof (struct inotify_event) + 100 + 1];
  } buf;
  int n;
  const char *s;

  s = strrchr (name, '/');
  if (s && s[1])
    name = s + 1;

  n = npth_read (fd, &buf, sizeof buf);
  if (n < sizeof (struct inotify_event))
    return 0;
  if (buf.ev.len < strlen (name)+1)
    return 0;
  if (strcmp (buf.ev.name, name))
    return 0; /* Not the desired file.  */

  return 1; /* Found.  */
}
#endif /*HAVE_INOTIFY_INIT*/


/* Main loop in daemon mode.  Note that LISTEN_FD will be owned by
 * this function. */
static void
handle_connections (assuan_fd_t listen_fd)
{
  npth_attr_t tattr;
#ifndef HAVE_W32_SYSTEM
  int signo;
#endif
  struct sockaddr_un paddr;
  socklen_t plen = sizeof( paddr );
  int nfd, ret;
  fd_set fdset, read_fdset;
  struct timespec abstime;
  struct timespec curtime;
  struct timespec timeout;
  int saved_errno;
  int my_inotify_fd = -1;

  npth_attr_init (&tattr);
  npth_attr_setdetachstate (&tattr, NPTH_CREATE_DETACHED);

#ifndef HAVE_W32_SYSTEM /* FIXME */
  npth_sigev_init ();
  npth_sigev_add (SIGHUP);
  npth_sigev_add (SIGUSR1);
  npth_sigev_add (SIGUSR2);
  npth_sigev_add (SIGINT);
  npth_sigev_add (SIGTERM);
  npth_sigev_fini ();
#endif

#ifdef HAVE_INOTIFY_INIT
  if (disable_check_own_socket)
    my_inotify_fd = -1;
  else if ((my_inotify_fd = inotify_init ()) == -1)
    log_info ("error enabling fast daemon termination: %s\n",
              strerror (errno));
  else
    {
      /* We need to watch the directory for the file because there
       * won't be an IN_DELETE_SELF for a socket file.  */
      char *slash = strrchr (socket_name, '/');
      log_assert (slash && slash[1]);
      *slash = 0;
      if (inotify_add_watch (my_inotify_fd, socket_name, IN_DELETE) == -1)
        {
          close (my_inotify_fd);
          my_inotify_fd = -1;
        }
      *slash = '/';
    }
#endif /*HAVE_INOTIFY_INIT*/


  /* Setup the fdset.  It has only one member.  This is because we use
     pth_select instead of pth_accept to properly sync timeouts with
     to full second.  */
  FD_ZERO (&fdset);
  FD_SET (FD2INT (listen_fd), &fdset);
  nfd = FD2NUM (listen_fd);
  if (my_inotify_fd != -1)
    {
      FD_SET (my_inotify_fd, &fdset);
      if (my_inotify_fd > nfd)
        nfd = my_inotify_fd;
    }

  npth_clock_gettime (&abstime);
  abstime.tv_sec += TIMERTICK_INTERVAL;

  /* Main loop.  */
  for (;;)
    {
      /* Shutdown test.  */
      if (shutdown_pending)
        {
          if (!active_connections || is_supervised)
            break; /* ready */

          /* Do not accept new connections but keep on running the
           * loop to cope with the timer events.
           *
           * Note that we do not close the listening socket because a
           * client trying to connect to that socket would instead
           * restart a new dirmngr instance - which is unlikely the
           * intention of a shutdown. */
          /* assuan_sock_close (listen_fd); */
          /* listen_fd = -1; */
          FD_ZERO (&fdset);
          nfd = -1;
          if (my_inotify_fd != -1)
            {
              FD_SET (my_inotify_fd, &fdset);
              nfd = my_inotify_fd;
            }
	}

      /* Take a copy of the fdset.  */
      read_fdset = fdset;

      npth_clock_gettime (&curtime);
      if (!(npth_timercmp (&curtime, &abstime, <)))
	{
	  /* Timeout.  When a shutdown is pending we use a shorter
           * interval to handle the shutdown more quickly.  */
	  handle_tick ();
	  npth_clock_gettime (&abstime);
	  abstime.tv_sec += (shutdown_pending
                             ? TIMERTICK_INTERVAL_SHUTDOWN
                             : TIMERTICK_INTERVAL);
	}
      npth_timersub (&abstime, &curtime, &timeout);

#ifndef HAVE_W32_SYSTEM
      ret = npth_pselect (nfd+1, &read_fdset, NULL, NULL, &timeout,
                          npth_sigev_sigmask());
      saved_errno = errno;

      while (npth_sigev_get_pending(&signo))
	handle_signal (signo);
#else
      ret = npth_eselect (nfd+1, &read_fdset, NULL, NULL, &timeout, NULL, NULL);
      saved_errno = errno;
#endif

      if (ret == -1 && saved_errno != EINTR)
	{
          log_error (_("npth_pselect failed: %s - waiting 1s\n"),
                     strerror (saved_errno));
          gnupg_sleep (1);
          continue;
	}

      if (ret <= 0)
        {
          /* Interrupt or timeout.  Will be handled when calculating the
             next timeout.  */
          continue;
        }

      if (shutdown_pending)
        {
          /* Do not anymore accept connections.  */
          continue;
        }

#ifdef HAVE_INOTIFY_INIT
      if (my_inotify_fd != -1 && FD_ISSET (my_inotify_fd, &read_fdset)
          && my_inotify_is_name (my_inotify_fd, socket_name))
        {
          shutdown_pending = 1;
          log_info ("socket file has been removed - shutting down\n");
        }
#endif /*HAVE_INOTIFY_INIT*/

      if (FD_ISSET (FD2INT (listen_fd), &read_fdset))
	{
          gnupg_fd_t fd;

          plen = sizeof paddr;
	  fd = assuan_sock_accept (listen_fd,
                                   (struct sockaddr *)&paddr, &plen);
	  if (fd == GNUPG_INVALID_FD)
	    {
              gpg_error_t myerr = gpg_error_from_syserror ();
              log_libassuan_system_error (listen_fd);
	      log_error ("accept failed: %s\n", gpg_strerror (myerr));
	    }
          else
            {
              char threadname[50];
              union int_and_ptr_u argval;
	      npth_t thread;

              memset (&argval, 0, sizeof argval);
              argval.afd = fd;
              snprintf (threadname, sizeof threadname,
                        "conn fd=%d", FD_DBG (fd));

              ret = npth_create (&thread, &tattr,
                                 start_connection_thread, argval.aptr);
	      if (ret)
                {
                  log_error ("error spawning connection handler: %s\n",
                             strerror (ret) );
                  assuan_sock_close (fd);
                }
	      npth_setname_np (thread, threadname);
            }
	}
    }

#ifdef HAVE_INOTIFY_INIT
  if (my_inotify_fd != -1)
    close (my_inotify_fd);
#endif /*HAVE_INOTIFY_INIT*/
  npth_attr_destroy (&tattr);
  if (listen_fd != GNUPG_INVALID_FD)
    assuan_sock_close (listen_fd);
  cleanup ();
  log_info ("%s %s stopped\n", gpgrt_strusage(11), gpgrt_strusage(13));
}

const char*
dirmngr_get_current_socket_name (void)
{
  if (socket_name)
    return socket_name;
  else
    return dirmngr_socket_name ();
}



/* Parse the revision part from the extended version blurb.  */
static const char *
get_revision_from_blurb (const char *blurb, int *r_len)
{
  const char *s = blurb? blurb : "";
  int n;

  for (; *s; s++)
    if (*s == '\n' && s[1] == '(')
      break;
  if (*s)
    {
      s += 2;
      for (n=0; s[n] && s[n] != ' '; n++)
        ;
    }
  else
    {
      s = "?";
      n = 1;
    }
  *r_len = n;
  return s;
}


/* Print versions of dirmngr and used libraries.  This is used by
 * "gpgconf --show-versions" so that there is no need to link gpgconf
 * against all these libraries.  This is an internal API and should
 * not be relied upon.  */
static void
gpgconf_versions (void)
{
  const char *s;
  int n;

#if NPTH_VERSION_NUMBER >= 0x010800
  es_fprintf (es_stdout, "* nPth %s (%s)\n\n",
              npth_get_version (NULL), npth_get_version ("\x01\x02"));
#endif /*NPTH_VERSION_NUMBER*/

  s = get_revision_from_blurb (assuan_check_version ("\x01\x01"), &n);
  es_fprintf (es_stdout, "* Libassuan %s (%.*s)\n\n",
              assuan_check_version (NULL), n, s);

  s = get_revision_from_blurb (ksba_check_version ("\x01\x01"), &n);
  es_fprintf (es_stdout, "* KSBA %s (%.*s)\n\n",
              ksba_check_version (NULL), n, s);

#ifdef HTTP_USE_NTBTLS
  s = get_revision_from_blurb (ntbtls_check_version ("\x01\x01"), &n);
  es_fprintf (es_stdout, "* NTBTLS %s (%.*s)\n\n",
              ntbtls_check_version (NULL), n, s);
#elif HTTP_USE_GNUTLS
  es_fprintf (es_stdout, "* GNUTLS %s\n\n",
              gnutls_check_version (NULL));
#endif

}
