dirmngr.c
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dirmngr.c
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	/* dirmngr.c - LDAP access
	* Copyright (C) 2002 Klarälvdalens Datakonsult AB
	* Copyright (C) 2003, 2004, 2006, 2007, 2008, 2010, 2011 g10 Code GmbH
	*
	* This file is part of DirMngr.
	*
	* DirMngr 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 2 of the License, or
	* (at your option) any later version.
	*
	* DirMngr 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, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	* 02110-1301, USA.
	*/

	#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
	#include <pth.h>


	#define JNLIB_NEED_LOG_LOGV
	#define JNLIB_NEED_AFLOCAL
	#include "dirmngr.h"

	#include <assuan.h>

	#include "certcache.h"
	#include "crlcache.h"
	#include "crlfetch.h"
	#include "misc.h"
	#include "ldapserver.h"
	#include "asshelp.h"
	#include "ldap-wrapper.h"

	/* The plain Windows version uses the windows service system. For
	example to start the service you may use "sc start dirmngr".
	WindowsCE does not support this; the service system over there is
	based on a single process with all services being DLLs - we can't
	support this easily. */
	#if defined(HAVE_W32_SYSTEM) && !defined(HAVE_W32CE_SYSTEM)
	# define USE_W32_SERVICE 1
	#endif


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

	aServer,
	aDaemon,
	aService,
	aListCRLs,
	aLoadCRL,
	aFetchCRL,
	aShutdown,
	aFlush,
	aGPGConfList,
	aGPGConfTest,

	oOptions,
	oDebug,
	oDebugAll,
	oDebugWait,
	oDebugLevel,
	oNoGreeting,
	oNoOptions,
	oHomedir,
	oNoDetach,
	oLogFile,
	oBatch,
	oDisableHTTP,
	oDisableLDAP,
	oIgnoreLDAPDP,
	oIgnoreHTTPDP,
	oIgnoreOCSPSvcUrl,
	oHonorHTTPProxy,
	oHTTPProxy,
	oLDAPProxy,
	oOnlyLDAPProxy,
	oLDAPFile,
	oLDAPTimeout,
	oLDAPAddServers,
	oOCSPResponder,
	oOCSPSigner,
	oOCSPMaxClockSkew,
	oOCSPMaxPeriod,
	oOCSPCurrentPeriod,
	oMaxReplies,
	oFakedSystemTime,
	oForce,
	oAllowOCSP,
	oSocketName,
	oLDAPWrapperProgram,
	oHTTPWrapperProgram,
	oIgnoreCertExtension,
	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)") ),
	#ifdef USE_W32_SERVICE
	ARGPARSE_c (aService, "service", N_("run as windows service (background)")),
	#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 (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 (oSocketName, "socket-name", "@"), /* Only for debugging. */

	ARGPARSE_s_u (oFakedSystemTime, "faked-system-time", "@"), /(epoch time)/
	ARGPARSE_p_u (oDebug, "debug", "@"),
	ARGPARSE_s_n (oDebugAll, "debug-all", "@"),
	ARGPARSE_s_i (oDebugWait, "debug-wait", "@"),
	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_group (302,N_("@\n(See the \"info\" manual for a complete listing "
	"of all commands and options)\n")),

	ARGPARSE_end ()
	};

	#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;

	/* 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 we will 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;

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

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

	/* The timer tick used for housekeeping stuff. For Windows we use a
	longer period as the SetWaitableTimer seems to signal earlier than
	the 2 seconds. CHECK_OWN_SOCKET_INTERVAL defines how often we
	check our own socket in standard socket mode. If that value is 0
	we don't check at all. All values are in seconds. */
	#if defined(HAVE_W32CE_SYSTEM)
	# define TIMERTICK_INTERVAL (60)
	#elif defined(HAVE_W32_SYSTEM)
	# define TIMERTICK_INTERVAL (4)
	#else
	# define TIMERTICK_INTERVAL (2)
	#endif

	/* 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 (pth_key_getdata 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);
	static ldap_server_t parse_ldapserver_file (const char* filename);
	static fingerprint_list_t parse_ocsp_signer (const char *string);
	static void handle_connections (assuan_fd_t listen_fd);

	/* Pth wrapper function definitions. */
	ASSUAN_SYSTEM_PTH_IMPL;

	GCRY_THREAD_OPTION_PTH_IMPL;
	static int fixed_gcry_pth_init (void)
	{
	return pth_self ()? 0 : (pth_init () == FALSE) ? errno : 0;
	}

	#ifndef PTH_HAVE_PTH_THREAD_ID
	static unsigned long pth_thread_id (void)
	{
	return (unsigned long)pth_self ();
	}
	#endif

	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"
	"LDAP 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;
	}


	/* 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_ASSUAN_VALUE;
	else if (!strcmp (debug_level, "advanced") \|\| (numok && numlvl <= 5))
	opt.debug = (DBG_ASSUAN_VALUE\|DBG_X509_VALUE\|DBG_LOOKUP_VALUE);
	else if (!strcmp (debug_level, "expert") \|\| (numok && numlvl <= 8))
	opt.debug = (DBG_ASSUAN_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);
	}


	static void
	wrong_args (const char *text)
	{
	es_fputs (_("usage: dirmngr [options] "), es_stderr);
	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)
	{
	ldap_wrapper_wait_connections ();
	}


	/* 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.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);
	return 1;
	}

	switch (pargs->r_opt)
	{
	case oQuiet: opt.quiet = 1; break;
	case oVerbose: opt.verbose++; break;
	case oDebug: opt.debug \|= pargs->r.ret_ulong; break;
	case oDebugAll: opt.debug = ~0; break;
	case oDebugLevel: debug_level = pargs->r.ret_str; 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 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 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 oIgnoreCertExtension:
	add_to_strlist (&opt.ignored_cert_extensions, pargs->r.ret_str);
	break;

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

	return 1; /* Handled. */
	}


	#ifdef USE_W32_SERVICE
	/* The global status of our service. */
	SERVICE_STATUS_HANDLE service_handle;
	SERVICE_STATUS service_status;

	DWORD WINAPI
	w32_service_control (DWORD control, DWORD event_type, LPVOID event_data,
	LPVOID context)
	{
	/* event_type and event_data are not used here. */
	switch (control)
	{
	case SERVICE_CONTROL_SHUTDOWN:
	/* For shutdown we will try to force termination. */
	service_status.dwCurrentState = SERVICE_STOP_PENDING;
	SetServiceStatus (service_handle, &service_status);
	shutdown_pending = 3;
	break;

	case SERVICE_CONTROL_STOP:
	service_status.dwCurrentState = SERVICE_STOP_PENDING;
	SetServiceStatus (service_handle, &service_status);
	shutdown_pending = 1;
	break;

	default:
	break;
	}
	return 0;
	}
	#endif /USE_W32_SERVICE/

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

	value.aptr = pth_key_getdata (my_tlskey_current_fd);
	*r_suffix = value.aint;
	return (r_suffix != -1); / Use decimal representation. */
	}
	#endif /!HAVE_W32_SYSTEM/


	#ifdef USE_W32_SERVICE
	# define main real_main
	#endif
	int
	main (int argc, char **argv)
	{
	#ifdef USE_W32_SERVICE
	# undef main
	#endif
	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;
	char *ldapfile = NULL;
	int debug_wait = 0;
	int rc;
	int homedir_seen = 0;
	struct assuan_malloc_hooks malloc_hooks;

	#ifdef USE_W32_SERVICE
	/* The option will be set by main() below if we should run as a
	system daemon. */
	if (opt.system_service)
	{
	service_handle
	= RegisterServiceCtrlHandlerEx ("DirMngr",
	&w32_service_control, NULL /FIXME/);
	if (service_handle == 0)
	log_error ("failed to register service control handler: ec=%d",
	(int) GetLastError ());
	service_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
	service_status.dwCurrentState = SERVICE_START_PENDING;
	service_status.dwControlsAccepted
	= SERVICE_ACCEPT_STOP \| SERVICE_ACCEPT_SHUTDOWN;
	service_status.dwWin32ExitCode = NO_ERROR;
	service_status.dwServiceSpecificExitCode = NO_ERROR;
	service_status.dwCheckPoint = 0;
	service_status.dwWaitHint = 10000; /* 10 seconds timeout. */
	SetServiceStatus (service_handle, &service_status);
	}
	#endif /USE_W32_SERVICE/

	set_strusage (my_strusage);
	log_set_prefix ("dirmngr", 1\|4);

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

	/* Libgcrypt requires us to register the threading model first.
	Note that this will also do the pth_init. */
	gcry_threads_pth.init = fixed_gcry_pth_init;
	rc = gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pth);
	if (rc)
	{
	log_fatal ("can't register GNU Pth with Libgcrypt: %s\n",
	gpg_strerror (rc));
	}
	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 (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
	log_fatal (_("%s is too old (need %s, have %s)\n"), "libgcrypt",
	NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
	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 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_PTH);
	assuan_sock_init ();
	setup_libassuan_logging (&opt.debug);

	setup_libgcrypt_logging ();

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

	opt.homedir = default_homedir ();

	/* Now with Pth running we can set the logging callback. Our
	windows implementation does not yet feature the Pth TLS
	functions. */
	#ifndef HAVE_W32_SYSTEM
	if (pth_key_create (&my_tlskey_current_fd, NULL))
	if (pth_key_setdata (my_tlskey_current_fd, NULL))
	log_set_pid_suffix_cb (pid_suffix_callback);
	#endif /!HAVE_W32_SYSTEM/

	/* 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. */
	socket_name = dirmngr_socket_name ();

	/* 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)
	{
	opt.homedir = pargs.r.ret_str;
	homedir_seen = 1;
	}
	else if (pargs.r_opt == aDaemon)
	opt.system_daemon = 1;
	else if (pargs.r_opt == aService)
	{
	/* Redundant. The main function takes care of it. */
	opt.system_service = 1;
	opt.system_daemon = 1;
	}
	#ifdef HAVE_W32_SYSTEM
	else if (pargs.r_opt == aGPGConfList \|\| pargs.r_opt == aGPGConfTest)
	/* We set this so we switch to the system configuration
	directory below. This is a crutch to solve the problem
	that the user configuration is never used on Windows. Also
	see below at aGPGConfList. */
	opt.system_daemon = 1;
	#endif
	}

	/* If --daemon has been given on the command line but not --homedir,
	we switch to /etc/dirmngr as default home directory. Note, that
	this also overrides the GNUPGHOME environment variable. */
	if (opt.system_daemon && !homedir_seen)
	{
	#ifdef HAVE_W32CE_SYSTEM
	opt.homedir == DIRSEP_S "gnupg";
	#else
	opt.homedir = gnupg_sysconfdir ();
	#endif
	opt.homedir_data = gnupg_datadir ();
	opt.homedir_cache = gnupg_cachedir ();
	}

	if (default_config)
	configname = make_filename (opt.homedir, "dirmngr.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 aService:
	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 oDebug: opt.debug \|= pargs.r.ret_ulong; break;
	case oDebugAll: opt.debug = ~0; break;
	case oDebugLevel: debug_level = pargs.r.ret_str; 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: ldapfile = pargs.r.ret_str; 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_data)
	opt.homedir_data = opt.homedir;
	if (!opt.homedir_cache)
	opt.homedir_cache = opt.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 (!access ("/etc/dirmngr", F_OK) && !strncmp (opt.homedir, "/etc/", 5))
	log_info
	("NOTE: DirMngr is now a proper part of GnuPG. 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");

	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 ();

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

	#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 && opt.system_service)
	cmd = aDaemon;
	else if (!cmd)
	cmd = aServer;
	rc = 0;

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

	if (logfile)
	{
	log_set_file (logfile);
	log_set_prefix (NULL, 2\|4);
	}

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

	ldap_wrapper_launch_thread ();
	cert_cache_init ();
	crl_cache_init ();
	start_command_handler (ASSUAN_INVALID_FD);
	shutdown_reaper ();
	}
	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, (JNLIB_LOG_WITH_PREFIX
	\|JNLIB_LOG_WITH_TIME
	\|JNLIB_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
	if (strlen (socket_name)+1 >= sizeof serv_addr.sun_path )
	{
	log_error (_("name of socket too long\n"));
	dirmngr_exit (1);
	}

	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);
	}

	memset (&serv_addr, 0, sizeof serv_addr);
	serv_addr.sun_family = AF_UNIX;
	strcpy (serv_addr.sun_path, 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 (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 (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"), socket_name );

	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
	pid = getpid ();
	es_printf ("set DIRMNGR_INFO=%s;%lu;1\n", socket_name, (ulong) pid);
	#else
	pid = pth_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, "DIRMNGR_INFO=%s:%lu:1",
	socket_name, (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 DIRMNGR_INFO;\n", infostr);
	}
	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 )
	close (i);
	}
	if (setsid() == -1)
	{
	log_error ("setsid() failed: %s\n", strerror(errno) );
	dirmngr_exit (1);
	}

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

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

	ldap_wrapper_launch_thread ();
	cert_cache_init ();
	crl_cache_init ();
	#ifdef USE_W32_SERVICE
	if (opt.system_service)
	{
	service_status.dwCurrentState = SERVICE_RUNNING;
	SetServiceStatus (service_handle, &service_status);
	}
	#endif
	handle_connections (fd);
	assuan_sock_close (fd);
	shutdown_reaper ();
	#ifdef USE_W32_SERVICE
	if (opt.system_service)
	{
	service_status.dwCurrentState = SERVICE_STOPPED;
	SetServiceStatus (service_handle, &service_status);
	}
	#endif
	}
	else if (cmd == aListCRLs)
	{
	/* Just list the CRL cache and exit. */
	if (argc)
	wrong_args ("--list-crls");
	ldap_wrapper_launch_thread ();
	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);

	ldap_wrapper_launch_thread ();
	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);
	}
	}
	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);

	ldap_wrapper_launch_thread ();
	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);
	}
	}
	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;

	/* List options and default values in the GPG Conf format. */

	/* The following list is taken from gnupg/tools/gpgconf-comp.c. */
	/* Option flags. YOU MUST NOT CHANGE THE NUMBERS OF THE EXISTING
	FLAGS, AS THEY ARE PART OF THE EXTERNAL INTERFACE. */
	#define GC_OPT_FLAG_NONE 0UL
	/* The DEFAULT flag for an option indicates that the option has a
	default value. */
	#define GC_OPT_FLAG_DEFAULT (1UL << 4)
	/* The DEF_DESC flag for an option indicates that the option has a
	default, which is described by the value of the default field. */
	#define GC_OPT_FLAG_DEF_DESC (1UL << 5)
	/* The NO_ARG_DESC flag for an option indicates that the argument has
	a default, which is described by the value of the ARGDEF field. */
	#define GC_OPT_FLAG_NO_ARG_DESC (1UL << 6)
	#define GC_OPT_FLAG_NO_CHANGE (1UL <<7)

	#ifdef HAVE_W32_SYSTEM
	/* On Windows systems, dirmngr always runs as system daemon, and
	the per-user configuration is never used. So we short-cut
	everything to use the global system configuration of dirmngr
	above, and here we set the no change flag to make these
	read-only. */
	flags \|= GC_OPT_FLAG_NO_CHANGE;
	#endif

	/* 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 (opt.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 (opt.homedir,
	opt.system_daemon?
	"ldapservers.conf":"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 ("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);
	}
	cleanup ();
	return !!rc;
	}


	#ifdef USE_W32_SERVICE
	int
	main (int argc, char *argv[])
	{
	int i;

	/* Find out if we run in daemon mode or on the command line. */
	for (i = 1; i < argc; i++)
	if (!strcmp (argv[i], "--service"))
	{
	opt.system_service = 1;
	opt.system_daemon = 1;
	break;
	}

	if (!opt.system_service)
	return real_main (argc, argv);
	else
	{
	SERVICE_TABLE_ENTRY DispatchTable [] =
	{
	/* Ignore warning. */
	{ "DirMngr", &real_main },
	{ NULL, NULL }
	};

	if (!StartServiceCtrlDispatcher (DispatchTable))
	return 1;
	return 0;
	}
	}
	#endif /USE_W32_SERVICE/


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

	ldapserver_list_free (opt.ldapservers);
	opt.ldapservers = NULL;

	if (cleanup_socket)
	{
	cleanup_socket = 0;
	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)
	{
	(void)ctrl;

	/* Nothing for now. */
	}


	/* 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

	*/
	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;
	}


	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 (opt.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/
	}




	/*
	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 PTH
	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 ();
	}


	/* 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 ();
	}



	/* The signal handler. */
	static void
	handle_signal (int signo)
	{
	switch (signo)
	{
	#ifndef HAVE_W32_SYSTEM
	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;
	#endif
	default:
	log_info (_("signal %d received - no action defined\n"), signo);
	}
	}


	/* This is the worker for the ticker. It is called every few seconds
	and may only do fast operations. */
	static void
	handle_tick (void)
	{
	/* Nothing real to do right now. Actually we need the timeout only
	for W32 where we don't use signals and need a way for the loop to
	check for the shutdown flag. */
	#ifdef HAVE_W32_SYSTEM
	if (shutdown_pending)
	log_info (_("SIGTERM received - shutting down ...\n"));
	if (shutdown_pending > 2)
	{
	log_info (_("shutdown forced\n"));
	log_info ("%s %s stopped\n", strusage(11), strusage(13) );
	cleanup ();
	dirmngr_exit (0);
	}
	#endif /HAVE_W32_SYSTEM/
	}


	/* Check the nonce on a new connection. This is a NOP unless we 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 fucntion. */
	static void *
	start_connection_thread (void *arg)
	{
	union int_and_ptr_u argval;
	gnupg_fd_t fd;

	argval.aptr = arg;
	fd = argval.afd;

	if (check_nonce (fd, &socket_nonce))
	{
	log_error ("handler 0x%lx nonce check FAILED\n", pth_thread_id ());
	return NULL;
	}

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

	return NULL;
	}


	/* Main loop in daemon mode. */
	static void
	handle_connections (assuan_fd_t listen_fd)
	{
	pth_attr_t tattr;
	pth_event_t ev, time_ev;
	sigset_t sigs;
	int signo;
	struct sockaddr_un paddr;
	socklen_t plen = sizeof( paddr );
	gnupg_fd_t fd;
	int nfd, ret;
	fd_set fdset, read_fdset;

	tattr = pth_attr_new();
	pth_attr_set (tattr, PTH_ATTR_JOINABLE, 0);
	pth_attr_set (tattr, PTH_ATTR_STACK_SIZE, 1024*1024);
	pth_attr_set (tattr, PTH_ATTR_NAME, "dirmngr");

	#ifndef HAVE_W32_SYSTEM /* FIXME */
	/* Make sure that the signals we are going to handle are not blocked
	and create an event object for them. We also set the default
	action to ignore because we use an Pth event to get notified
	about signals. This avoids that the default action is taken in
	case soemthing goes wrong within Pth. The problem might also be
	a Pth bug. */
	sigemptyset (&sigs );
	{
	static const int mysigs[] = { SIGHUP, SIGUSR1, SIGUSR2, SIGINT, SIGTERM };
	struct sigaction sa;
	int i;

	for (i=0; i < DIM (mysigs); i++)
	{
	sigemptyset (&sa.sa_mask);
	sa.sa_handler = SIG_IGN;
	sa.sa_flags = 0;
	sigaction (mysigs[i], &sa, NULL);

	sigaddset (&sigs, mysigs[i]);
	}
	}

	pth_sigmask (SIG_UNBLOCK, &sigs, NULL);
	ev = pth_event (PTH_EVENT_SIGS, &sigs, &signo);
	#else
	/* Use a dummy event. */
	sigs = 0;
	ev = pth_event (PTH_EVENT_SIGS, &sigs, &signo);
	#endif
	time_ev = NULL;

	/* 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);

	/* Main loop. */
	for (;;)
	{
	/* Make sure that our signals are not blocked. */
	pth_sigmask (SIG_UNBLOCK, &sigs, NULL);

	/* 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. */
	FD_ZERO (&fdset);
	}

	/* Create a timeout event if needed. To help with power saving
	we syncronize the ticks to the next full second. */
	if (!time_ev)
	{
	pth_time_t nexttick;

	nexttick = pth_timeout (TIMERTICK_INTERVAL, 0);
	if (nexttick.tv_usec > 10) /* Use a 10 usec threshhold. */
	{
	nexttick.tv_sec++;
	nexttick.tv_usec = 0;
	}
	time_ev = pth_event (PTH_EVENT_TIME, nexttick);
	}

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

	if (time_ev)
	pth_event_concat (ev, time_ev, NULL);

	ret = pth_select_ev (nfd+1, &read_fdset, NULL, NULL, NULL, ev);

	if (time_ev)
	pth_event_isolate (time_ev);

	if (ret == -1)
	{
	if (pth_event_occurred (ev)
	\|\| (time_ev && pth_event_occurred (time_ev)) )
	{
	if (pth_event_occurred (ev))
	handle_signal (signo);
	if (time_ev && pth_event_occurred (time_ev))
	{
	pth_event_free (time_ev, PTH_FREE_ALL);
	time_ev = NULL;
	handle_tick ();
	}
	continue;
	}
	log_error (_("pth_select failed: %s - waiting 1s\n"),
	strerror (errno));
	pth_sleep (1);
	continue;
	}

	if (pth_event_occurred (ev))
	{
	handle_signal (signo);
	}

	if (time_ev && pth_event_occurred (time_ev))
	{
	pth_event_free (time_ev, PTH_FREE_ALL);
	time_ev = NULL;
	handle_tick ();
	}


	/* We now might create a new thread and because we don't want
	any signals (as we are handling them here) to be delivered to
	a new thread we need to block those signals. */
	pth_sigmask (SIG_BLOCK, &sigs, NULL);

	if (!shutdown_pending && FD_ISSET (FD2INT (listen_fd), &read_fdset))
	{
	plen = sizeof paddr;
	fd = INT2FD (pth_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;

	argval.afd = fd;
	snprintf (threadname, sizeof threadname-1,
	"conn fd=%d", FD2INT(fd));
	threadname[sizeof threadname -1] = 0;
	pth_attr_set (tattr, PTH_ATTR_NAME, threadname);
	if (!pth_spawn (tattr, start_connection_thread, argval.aptr))
	{
	log_error ("error spawning connection handler: %s\n",
	strerror (errno) );
	assuan_sock_close (fd);
	}
	}
	fd = GNUPG_INVALID_FD;
	}
	}

	pth_event_free (ev, PTH_FREE_ALL);
	if (time_ev)
	pth_event_free (time_ev, PTH_FREE_ALL);
	pth_attr_destroy (tattr);
	cleanup ();
	log_info ("%s %s stopped\n", strusage(11), strusage(13));
	}

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