[gnupg2.git] / dirmngr / dirmngr.c

/* dirmngr.c - Keyserver and X.509 LDAP access
 * Copyright (C) 2002 Klarälvdalens Datakonsult AB
 * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2010, 2011 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/>.
 */

#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 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 "asshelp.h"
#if USE_LDAP
# include "ldap-wrapper.h"
#endif
#include "../common/init.h"
#include "gc-opt-flags.h"
#include "dns-stuff.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,

  oOptions,
  oDebug,
  oDebugAll,
  oDebugWait,
  oDebugLevel,
  oGnutlsDebug,
  oNoGreeting,
  oNoOptions,
  oHomedir,
  oNoDetach,
  oLogFile,
  oBatch,
  oDisableHTTP,
  oDisableLDAP,
  oIgnoreLDAPDP,
  oIgnoreHTTPDP,
  oIgnoreOCSPSvcUrl,
  oHonorHTTPProxy,
  oHTTPProxy,
  oLDAPProxy,
  oOnlyLDAPProxy,
  oLDAPFile,
  oLDAPTimeout,
  oLDAPAddServers,
  oOCSPResponder,
  oOCSPSigner,
  oOCSPMaxClockSkew,
  oOCSPMaxPeriod,
  oOCSPCurrentPeriod,
  oMaxReplies,
  oHkpCaCert,
  oFakedSystemTime,
  oForce,
  oAllowOCSP,
  oAllowVersionCheck,
  oSocketName,
  oLDAPWrapperProgram,
  oHTTPWrapperProgram,
  oIgnoreCertExtension,
  oUseTor,
  oKeyServer,
  oNameServer,
  oDisableCheckOwnSocket,
  oStandardResolver,
  oRecursiveResolver,
  oResolverTimeout,
  aTest
};



static ARGPARSE_OPTS opts[] = {

  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,  "supervised", N_("run in supervised mode")),
#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_c (aGPGConfList, "gpgconf-list", "@"),
  ARGPARSE_c (aGPGConfTest, "gpgconf-test", "@"),

  ARGPARSE_group (301, N_("@\nOptions:\n ")),

  ARGPARSE_s_n (oVerbose,  "verbose",   N_("verbose")),
  ARGPARSE_s_n (oQuiet,    "quiet",     N_("be somewhat more quiet")),
  ARGPARSE_s_n (oSh,       "sh",        N_("sh-style command output")),
  ARGPARSE_s_n (oCsh,      "csh",       N_("csh-style command output")),
  ARGPARSE_s_s (oOptions,  "options",   N_("|FILE|read options from FILE")),
  ARGPARSE_s_s (oDebugLevel, "debug-level",
                N_("|LEVEL|set the debugging level to LEVEL")),
  ARGPARSE_s_n (oNoDetach, "no-detach", N_("do not detach from the console")),
  ARGPARSE_s_s (oLogFile,  "log-file",
                N_("|FILE|write server mode logs to FILE")),
  ARGPARSE_s_n (oBatch,    "batch",       N_("run without asking a user")),
  ARGPARSE_s_n (oForce,    "force",       N_("force loading of outdated CRLs")),
  ARGPARSE_s_n (oAllowOCSP, "allow-ocsp", N_("allow sending OCSP requests")),
  ARGPARSE_s_n (oAllowVersionCheck, "allow-version-check",
                N_("allow online software version check")),
  ARGPARSE_s_n (oDisableHTTP, "disable-http", N_("inhibit the use of HTTP")),
  ARGPARSE_s_n (oDisableLDAP, "disable-ldap", N_("inhibit the use of LDAP")),
  ARGPARSE_s_n (oIgnoreHTTPDP,"ignore-http-dp",
                N_("ignore HTTP CRL distribution points")),
  ARGPARSE_s_n (oIgnoreLDAPDP,"ignore-ldap-dp",
                N_("ignore LDAP CRL distribution points")),
  ARGPARSE_s_n (oIgnoreOCSPSvcUrl, "ignore-ocsp-service-url",
                N_("ignore certificate contained OCSP service URLs")),

  ARGPARSE_s_s (oHTTPProxy,  "http-proxy",
                N_("|URL|redirect all HTTP requests to URL")),
  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 (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 (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_s_i (oMaxReplies, "max-replies",
                N_("|N|do not return more than N items in one query")),

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

  ARGPARSE_s_n (oUseTor, "use-tor", N_("route all network traffic via Tor")),

  ARGPARSE_s_s (oSocketName, "socket-name", "@"),  /* Only for debugging.  */

  ARGPARSE_s_u (oFakedSystemTime, "faked-system-time", "@"), /*(epoch time)*/
  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_n (oDisableCheckOwnSocket, "disable-check-own-socket", "@"),
  ARGPARSE_s_n (oNoGreeting, "no-greeting", "@"),
  ARGPARSE_s_s (oHomedir, "homedir", "@"),
  ARGPARSE_s_s (oLDAPWrapperProgram, "ldap-wrapper-program", "@"),
  ARGPARSE_s_s (oHTTPWrapperProgram, "http-wrapper-program", "@"),
  ARGPARSE_s_n (oHonorHTTPProxy, "honor-http-proxy", "@"),
  ARGPARSE_s_s (oIgnoreCertExtension,"ignore-cert-extension", "@"),
  ARGPARSE_s_n (oStandardResolver, "standard-resolver", "@"),
  ARGPARSE_s_n (oRecursiveResolver, "recursive-resolver", "@"),
  ARGPARSE_s_i (oResolverTimeout, "resolver-timeout", "@"),

  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"  },
    { 77, NULL } /* 77 := Do not exit on "help" or "?".  */
  };

#define DEFAULT_MAX_REPLIES 10
#define DEFAULT_LDAP_TIMEOUT 100 /* arbitrary large timeout */

/* 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;

/* 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;

/* 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;

/* The timer tick used for housekeeping stuff.  */
#define TIMERTICK_INTERVAL         (60)

/* 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 int my_tlskey_current_fd;
#endif

/* Prototypes. */
static void cleanup (void);
#if USE_LDAP
static ldap_server_t parse_ldapserver_file (const char* filename);
#endif /*USE_LDAP*/
static fingerprint_list_t parse_ocsp_signer (const char *string);
static void netactivity_action (void);
static void handle_connections (assuan_fd_t listen_fd);

/* NPth wrapper function definitions. */
ASSUAN_SYSTEM_NPTH_IMPL;

static const char *
my_strusage( int level )
{
  const char *p;
  switch ( level )
    {
    case 11: p = "@DIRMNGR@ (@GNUPG@)";
      break;
    case 13: p = VERSION; 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 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"))
    return gpg_error (GPG_ERR_NOT_SUPPORTED);
  if (resultsize < 20)
    return gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
  gcry_md_hash_buffer (2, result, buffer, length);
  *resultlen = 20;
  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);
    }
  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 (opt.use_tor)
    {
      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");
        }
    }
}


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 (ARGPARSE_ARGS *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;
      while (opt.ocsp_signer)
        {
          fingerprint_list_t tmp = opt.ocsp_signer->next;
          xfree (opt.ocsp_signer);
          opt.ocsp_signer = tmp;
        }
      FREE_STRLIST (opt.ignored_cert_extensions);
      http_register_tls_ca (NULL);
      FREE_STRLIST (opt.keyserver);
      /* Note: We do not allow resetting of opt.use_tor at runtime.  */
      disable_check_own_socket = 0;
      enable_standard_resolver (0);
      set_dns_timeout (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 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_ocsp_signer (pargs->r.ret_str);
      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:
      {
        char *tmpname;

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

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

    case oUseTor: opt.use_tor = 1; break;

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

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

  set_dns_verbose (opt.verbose, !!DBG_DNS);

  return 1; /* Handled. */
}


#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*/


static void
thread_init (void)
{
  npth_init ();
  gpgrt_set_syscall_clamp (npth_unprotect, npth_protect);

  /* Now 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*/
}


int
main (int argc, char **argv)
{
  enum cmd_and_opt_values cmd = 0;
  ARGPARSE_ARGS pargs;
  int orig_argc;
  char **orig_argv;
  FILE *configfp = NULL;
  char *configname = NULL;
  const char *shell;
  unsigned configlineno;
  int parse_debug = 0;
  int default_config =1;
  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 ();
  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_set_system_hooks (ASSUAN_SYSTEM_NPTH);
  assuan_sock_init ();
  setup_libassuan_logging (&opt.debug, dirmngr_assuan_log_monitor);

  setup_libgcrypt_logging ();

  /* 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);

  /* 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= 1|(1<<6);  /* do not remove the args, ignore version */
  while (arg_parse( &pargs, opts))
    {
      if (pargs.r_opt == oDebug || pargs.r_opt == oDebugAll)
        parse_debug++;
      else if (pargs.r_opt == oOptions)
        { /* Yes there is one, so we do not try the default one, but
             read the option file when it is encountered at the
             commandline */
          default_config = 0;
        }
      else if (pargs.r_opt == oNoOptions)
        default_config = 0; /* --no-options */
      else if (pargs.r_opt == oHomedir)
        {
          gnupg_set_homedir (pargs.r.ret_str);
        }
    }

  socket_name = dirmngr_socket_name ();
  if (default_config)
    configname = make_filename (gnupg_homedir (), DIRMNGR_NAME".conf", NULL );

  argc = orig_argc;
  argv = orig_argv;
  pargs.argc = &argc;
  pargs.argv = &argv;
  pargs.flags= 1;  /* do not remove the args */
 next_pass:
  if (configname)
    {
      configlineno = 0;
      configfp = fopen (configname, "r");
      if (!configfp)
        {
          if (default_config)
            {
              if( parse_debug )
                log_info (_("Note: no default option file '%s'\n"),
                          configname );
            }
          else
            {
              log_error (_("option file '%s': %s\n"),
                         configname, strerror(errno) );
              exit(2);
            }
          xfree (configname);
          configname = NULL;
        }
      if (parse_debug && configname )
        log_info (_("reading options from '%s'\n"), configname );
      default_config = 0;
    }

  while (optfile_parse( configfp, configname, &configlineno, &pargs, opts) )
    {
      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:
          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 oOptions:
          /* Config files may not be nested (silently ignore them) */
          if (!configfp)
            {
                xfree(configname);
                configname = xstrdup(pargs.r.ret_str);
                goto next_pass;
            }
          break;
        case oNoGreeting: nogreeting = 1; break;
        case oNoVerbose: opt.verbose = 0; break;
        case oNoOptions: break; /* no-options */
        case oHomedir: /* Ignore this option here. */; break;
        case oNoDetach: nodetach = 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 oLDAPTimeout:
          opt.ldaptimeout = pargs.r.ret_int;
          break;

        case oFakedSystemTime:
          gnupg_set_time ((time_t)pargs.r.ret_ulong, 0);
          break;

        case oForce: opt.force = 1; break;

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

        default : pargs.err = configfp? 1:2; break;
        }
    }
  if (configfp)
    {
      fclose (configfp);
      configfp = NULL;
      /* Keep a copy of the name so that it can be read on SIGHUP. */
      opt.config_filename = configname;
      configname = NULL;
      goto next_pass;
    }
  xfree (configname);
  configname = NULL;
  if (log_get_errorcount(0))
    exit(2);
  if (nogreeting )
    greeting = 0;

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

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

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

  if (opt.use_tor)
    {
      log_info ("WARNING: ***************************************\n");
      log_info ("WARNING: Tor mode (--use-tor) MAY NOT FULLY WORK!\n");
      log_info ("WARNING: ***************************************\n");
    }

  /* 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 (!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");
    }

  set_debug ();
  set_tor_mode ();

  /* Get LDAP server list from file. */
#if USE_LDAP
  if (!ldapfile)
    {
      ldapfile = make_filename (gnupg_homedir (),
                                "dirmngr_ldapservers.conf",
                                NULL);
      opt.ldapservers = parse_ldapserver_file (ldapfile);
      xfree (ldapfile);
    }
  else
      opt.ldapservers = parse_ldapserver_file (ldapfile);
#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");
        }


      thread_init ();
      cert_cache_init ();
      crl_cache_init ();
      http_register_netactivity_cb (netactivity_action);
      start_command_handler (ASSUAN_INVALID_FD);
      shutdown_reaper ();
    }
#ifndef HAVE_W32_SYSTEM
  else if (cmd == aSupervised)
    {
      /* 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.  */
      struct stat statbuf;
      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);

      thread_init ();
      cert_cache_init ();
      crl_cache_init ();
      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);
        }

#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 test whether a dirmngr is already running. */
          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_error (_("error binding socket to '%s': %s\n"),
                     serv_addr.sun_path,
                     gpg_strerror (gpg_error_from_errno (errno)));
          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), 5) == -1)
        {
          log_error (_("listen() failed: %s\n"), 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);
#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;

          if (chdir("/"))
            {
              log_error ("chdir to / failed: %s\n", strerror (errno));
              dirmngr_exit (1);
            }
        }
#endif

      thread_init ();
      cert_cache_init ();
      crl_cache_init ();
      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);

      thread_init ();
      cert_cache_init ();
      crl_cache_init ();
      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);

      thread_init ();
      cert_cache_init ();
      crl_cache_init ();
      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;
      char *filename_esc;

      /* First the configuration file.  This is not an option, but it
         is vital information for GPG Conf.  */
      if (!opt.config_filename)
        opt.config_filename = make_filename (gnupg_homedir (),
                                             "dirmngr.conf", NULL );

      filename = percent_escape (opt.config_filename, NULL);
      es_printf ("gpgconf-dirmngr.conf:%lu:\"%s\n",
              GC_OPT_FLAG_DEFAULT, filename);
      xfree (filename);

      es_printf ("verbose:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("quiet:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("debug-level:%lu:\"none\n", flags | GC_OPT_FLAG_DEFAULT);
      es_printf ("log-file:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("force:%lu:\n", flags | GC_OPT_FLAG_NONE);

      /* --csh and --sh are mutually exclusive, something we can not
         express in GPG Conf.  --options is only usable from the
         command line, really.  --debug-all interacts with --debug,
         and having both of them is thus problematic.  --no-detach is
         also only usable on the command line.  --batch is unused.  */

      filename = make_filename (gnupg_homedir (),
                                "dirmngr_ldapservers.conf",
                                NULL);
      filename_esc = percent_escape (filename, NULL);
      es_printf ("ldapserverlist-file:%lu:\"%s\n", flags | GC_OPT_FLAG_DEFAULT,
              filename_esc);
      xfree (filename_esc);
      xfree (filename);

      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);
      es_printf ("allow-ocsp:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("allow-version-check:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ocsp-responder:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ocsp-signer:%lu:\n", flags | GC_OPT_FLAG_NONE);

      es_printf ("faked-system-time:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("no-greeting:%lu:\n", flags | GC_OPT_FLAG_NONE);

      es_printf ("disable-http:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("disable-ldap:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("honor-http-proxy:%lu\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("http-proxy:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ldap-proxy:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("only-ldap-proxy:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ignore-ldap-dp:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ignore-http-dp:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("ignore-ocsp-service-url:%lu:\n", flags | GC_OPT_FLAG_NONE);
      /* Note: The next one is to fix a typo in gpgconf - should be
         removed eventually. */
      es_printf ("ignore-ocsp-servic-url:%lu:\n", flags | GC_OPT_FLAG_NONE);

      es_printf ("use-tor:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("keyserver:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("nameserver:%lu:\n", flags | GC_OPT_FLAG_NONE);
      es_printf ("resolver-timeout:%lu:%u\n",
                 flags | GC_OPT_FLAG_DEFAULT, 0);
    }
  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)
{
  if (opt.http_proxy)
    ctrl->http_proxy = xstrdup (opt.http_proxy);
}


void
dirmngr_deinit_default_ctrl (ctrl_t ctrl)
{
  if (!ctrl)
    return;
  xfree (ctrl->http_proxy);
  ctrl->http_proxy = NULL;
}


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

   The format fo 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 seprated 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)
{
  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)
    {
      log_error (_("error opening '%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*/

static fingerprint_list_t
parse_ocsp_signer (const char *string)
{
  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"),
                     "--ocsp-signer", 0);
          xfree (item);
          return NULL;
        }
      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;
        }
      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*/
}



\f
/*
   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' original arguments.  Unless
   we have a mechanism to tell this, we need to live on with this. */
static void
reread_configuration (void)
{
  ARGPARSE_ARGS pargs;
  FILE *fp;
  unsigned int configlineno = 0;
  int dummy;

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

  fp = fopen (opt.config_filename, "r");
  if (!fp)
    {
      log_error (_("option file '%s': %s\n"),
                 opt.config_filename, strerror(errno) );
      return;
    }

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

  memset (&pargs, 0, sizeof pargs);
  dummy = 0;
  pargs.argc = &dummy;
  pargs.flags = 1;  /* do not remove the args */
  while (optfile_parse (fp, opt.config_filename, &configlineno, &pargs, opts) )
    {
      if (pargs.r_opt < -1)
        pargs.err = 1; /* Print a warning. */
      else /* Try to parse this option - ignore unchangeable ones. */
        parse_rereadable_options (&pargs, 1);
    }
  fclose (fp);

  set_debug ();
  set_tor_mode ();
}


/* 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 ();
  cert_cache_deinit (0);
  crl_cache_deinit ();
  cert_cache_init ();
  crl_cache_init ();
  reload_dns_stuff (0);
}


/* 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:
      cert_cache_print_stats ();
      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", strusage(11), strusage(13) );
          cleanup ();
          dirmngr_exit (0);
        }
      break;

    case SIGINT:
      log_info (_("SIGINT received - immediate shutdown\n"));
      log_info( "%s %s stopped\n", strusage(11), 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;
  struct server_control_s ctrlbuf;

  (void)arg;

  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);

  if (network_activity_seen)
    {
      network_activity_seen = 0;
      if (opt.use_tor || opt.allow_version_check)
        dirmngr_load_swdb (&ctrlbuf, 0);
    }

  dirmngr_deinit_default_ctrl (&ctrlbuf);

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

}


#if GPGRT_GCC_HAVE_PUSH_PRAGMA
# pragma GCC push_options
# pragma GCC optimize ("no-strict-overflow")
#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_GCC_HAVE_PUSH_PRAGMA
# 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)
{
  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 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"),
                FD2INT (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)
{
  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"), FD2INT (fd));

  start_command_handler (fd);

  if (opt.verbose)
    log_info (_("handler for fd %d terminated\n"), FD2INT (fd));
  active_connections--;

#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 );
  gnupg_fd_t fd;
  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 = FD2INT (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)
            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.  */
          handle_tick ();
          npth_clock_gettime (&abstime);
          abstime.tv_sec += 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));
          npth_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))
        {
          plen = sizeof paddr;
          fd = INT2FD (npth_accept (FD2INT(listen_fd),
                                    (struct sockaddr *)&paddr, &plen));
          if (fd == GNUPG_INVALID_FD)
            {
              log_error ("accept failed: %s\n", strerror (errno));
            }
          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", FD2INT(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);
            }
          fd = GNUPG_INVALID_FD;
        }
    }

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

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