gnupg/tools/gpgconf-comp.c

/* gpgconf-comp.c - Configuration utility for GnuPG.
 * Copyright (C) 2004, 2007-2011 Free Software Foundation, Inc.
 * Copyright (C) 2016 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 GnuPG; if not, see <https://www.gnu.org/licenses/>.
 */

#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <stdarg.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <ctype.h>
#ifdef HAVE_W32_SYSTEM
# define WIN32_LEAN_AND_MEAN 1
# include <windows.h>
#else
# include <pwd.h>
# include <grp.h>
#endif

/* For log_logv(), asctimestamp(), gnupg_get_time ().  */
#include "../common/util.h"
#include "../common/i18n.h"
#include "../common/exechelp.h"
#include "../common/sysutils.h"

#include "../common/gc-opt-flags.h"
#include "gpgconf.h"

/* There is a problem with gpg 1.4 under Windows: --gpgconf-list
   returns a plain filename without escaping.  As long as we have not
   fixed that we need to use gpg2.  */
#if defined(HAVE_W32_SYSTEM) && !defined(HAVE_W32CE_SYSTEM)
#define GPGNAME "gpg2"
#else
#define GPGNAME GPG_NAME
#endif


/* TODO:
   Components: Add more components and their options.
   Robustness: Do more validation.  Call programs to do validation for us.
   Add options to change backend binary path.
   Extract binary path for some backends from gpgsm/gpg config.
*/


#if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5 ))
void gc_error (int status, int errnum, const char *fmt, ...) \
  __attribute__ ((format (printf, 3, 4)));
#endif

/* Output a diagnostic message.  If ERRNUM is not 0, then the output
   is followed by a colon, a white space, and the error string for the
   error number ERRNUM.  In any case the output is finished by a
   newline.  The message is prepended by the program name, a colon,
   and a whitespace.  The output may be further formatted or
   redirected by the jnlib logging facility.  */
void
gc_error (int status, int errnum, const char *fmt, ...)
{
  va_list arg_ptr;

  va_start (arg_ptr, fmt);
  log_logv (GPGRT_LOG_ERROR, fmt, arg_ptr);
  va_end (arg_ptr);

  if (errnum)
    log_printf (": %s\n", strerror (errnum));
  else
    log_printf ("\n");

  if (status)
    {
      log_printf (NULL);
      log_printf ("fatal error (exit status %i)\n", status);
      exit (status);
    }
}


/* Forward declaration.  */
static void gpg_agent_runtime_change (int killflag);
static void scdaemon_runtime_change (int killflag);
static void dirmngr_runtime_change (int killflag);

/* Backend configuration.  Backends are used to decide how the default
   and current value of an option can be determined, and how the
   option can be changed.  To every option in every component belongs
   exactly one backend that controls and determines the option.  Some
   backends are programs from the GPG system.  Others might be
   implemented by GPGConf itself.  If you change this enum, don't
   forget to update GC_BACKEND below.  */
typedef enum
  {
    /* Any backend, used for find_option ().  */
    GC_BACKEND_ANY,

    /* The Gnu Privacy Guard.  */
    GC_BACKEND_GPG,

    /* The Gnu Privacy Guard for S/MIME.  */
    GC_BACKEND_GPGSM,

    /* The GPG Agent.  */
    GC_BACKEND_GPG_AGENT,

    /* The GnuPG SCDaemon.  */
    GC_BACKEND_SCDAEMON,

    /* The GnuPG directory manager.  */
    GC_BACKEND_DIRMNGR,

    /* The LDAP server list file for the director manager.  */
    GC_BACKEND_DIRMNGR_LDAP_SERVER_LIST,

    /* The Pinentry (not a part of GnuPG, proper).  */
    GC_BACKEND_PINENTRY,

    /* The number of the above entries.  */
    GC_BACKEND_NR
  } gc_backend_t;


/* To be able to implement generic algorithms for the various
   backends, we collect all information about them in this struct.  */
static const struct
{
  /* The name of the backend.  */
  const char *name;

  /* The name of the program that acts as the backend.  Some backends
     don't have an associated program, but are implemented directly by
     GPGConf.  In this case, PROGRAM is NULL.  */
  char *program;

  /* The module name (GNUPG_MODULE_NAME_foo) as defined by
     ../common/util.h.  This value is used to get the actual installed
     path of the program.  0 is used if no backend program is
     available. */
  char module_name;

  /* The runtime change callback.  If KILLFLAG is true the component
     is killed and not just reloaded.  */
  void (*runtime_change) (int killflag);

  /* The option name for the configuration filename of this backend.
     This must be an absolute filename.  It can be an option from a
     different backend (but then ordering of the options might
     matter).  Note: This must be unique among all components.  */
  const char *option_config_filename;

  /* If this is a file backend rather than a program backend, then
     this is the name of the option associated with the file.  */
  const char *option_name;
} gc_backend[GC_BACKEND_NR] =
  {
    { NULL },		/* GC_BACKEND_ANY dummy entry.  */
    { GPG_DISP_NAME, GPGNAME, GNUPG_MODULE_NAME_GPG,
      NULL, GPGCONF_NAME "-" GPG_NAME ".conf" },
    { GPGSM_DISP_NAME, GPGSM_NAME, GNUPG_MODULE_NAME_GPGSM,
      NULL, GPGCONF_NAME "-" GPGSM_NAME ".conf" },
    { GPG_AGENT_DISP_NAME, GPG_AGENT_NAME, GNUPG_MODULE_NAME_AGENT,
      gpg_agent_runtime_change, GPGCONF_NAME"-" GPG_AGENT_NAME ".conf" },
    { SCDAEMON_DISP_NAME, SCDAEMON_NAME, GNUPG_MODULE_NAME_SCDAEMON,
      scdaemon_runtime_change, GPGCONF_NAME"-" SCDAEMON_NAME ".conf" },
    { DIRMNGR_DISP_NAME, DIRMNGR_NAME, GNUPG_MODULE_NAME_DIRMNGR,
      dirmngr_runtime_change, GPGCONF_NAME "-" DIRMNGR_NAME ".conf" },
    { DIRMNGR_DISP_NAME " LDAP Server List", NULL, 0,
      NULL, "ldapserverlist-file", "LDAP Server" },
    { "Pinentry", "pinentry", GNUPG_MODULE_NAME_PINENTRY,
      NULL, GPGCONF_NAME "-pinentry.conf" },
  };


/* Option configuration.  */

/* An option might take an argument, or not.  Argument types can be
   basic or complex.  Basic types are generic and easy to validate.
   Complex types provide more specific information about the intended
   use, but can be difficult to validate.  If you add to this enum,
   don't forget to update GC_ARG_TYPE below.  YOU MUST NOT CHANGE THE
   NUMBERS OF THE EXISTING ENTRIES, AS THEY ARE PART OF THE EXTERNAL
   INTERFACE.  */
typedef enum
  {
    /* Basic argument types.  */

    /* No argument.  */
    GC_ARG_TYPE_NONE = 0,

    /* A String argument.  */
    GC_ARG_TYPE_STRING = 1,

    /* A signed integer argument.  */
    GC_ARG_TYPE_INT32 = 2,

    /* An unsigned integer argument.  */
    GC_ARG_TYPE_UINT32 = 3,

    /* ADD NEW BASIC TYPE ENTRIES HERE.  */

    /* Complex argument types.  */

    /* A complete filename.  */
    GC_ARG_TYPE_FILENAME = 32,

    /* An LDAP server in the format
       HOSTNAME:PORT:USERNAME:PASSWORD:BASE_DN.  */
    GC_ARG_TYPE_LDAP_SERVER = 33,

    /* A 40 character fingerprint.  */
    GC_ARG_TYPE_KEY_FPR = 34,

    /* A user ID or key ID or fingerprint for a certificate.  */
    GC_ARG_TYPE_PUB_KEY = 35,

    /* A user ID or key ID or fingerprint for a certificate with a key.  */
    GC_ARG_TYPE_SEC_KEY = 36,

    /* A alias list made up of a key, an equal sign and a space
       separated list of values.  */
    GC_ARG_TYPE_ALIAS_LIST = 37,

    /* ADD NEW COMPLEX TYPE ENTRIES HERE.  */

    /* The number of the above entries.  */
    GC_ARG_TYPE_NR
  } gc_arg_type_t;


/* For every argument, we record some information about it in the
   following struct.  */
static const struct
{
  /* For every argument type exists a basic argument type that can be
     used as a fallback for input and validation purposes.  */
  gc_arg_type_t fallback;

  /* Human-readable name of the type.  */
  const char *name;
} gc_arg_type[GC_ARG_TYPE_NR] =
  {
    /* The basic argument types have their own types as fallback.  */
    { GC_ARG_TYPE_NONE, "none" },
    { GC_ARG_TYPE_STRING, "string" },
    { GC_ARG_TYPE_INT32, "int32" },
    { GC_ARG_TYPE_UINT32, "uint32" },

    /* Reserved basic type entries for future extension.  */
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },
    { GC_ARG_TYPE_NR, NULL }, { GC_ARG_TYPE_NR, NULL },

    /* The complex argument types have a basic type as fallback.  */
    { GC_ARG_TYPE_STRING, "filename" },
    { GC_ARG_TYPE_STRING, "ldap server" },
    { GC_ARG_TYPE_STRING, "key fpr" },
    { GC_ARG_TYPE_STRING, "pub key" },
    { GC_ARG_TYPE_STRING, "sec key" },
    { GC_ARG_TYPE_STRING, "alias list" },
  };


/* Every option has an associated expert level, than can be used to
   hide advanced and expert options from beginners.  If you add to
   this list, don't forget to update GC_LEVEL below.  YOU MUST NOT
   CHANGE THE NUMBERS OF THE EXISTING ENTRIES, AS THEY ARE PART OF THE
   EXTERNAL INTERFACE.  */
typedef enum
  {
    /* The basic options should always be displayed.  */
    GC_LEVEL_BASIC,

    /* The advanced options may be hidden from beginners.  */
    GC_LEVEL_ADVANCED,

    /* The expert options should only be displayed to experts.  */
    GC_LEVEL_EXPERT,

    /* The invisible options should normally never be displayed.  */
    GC_LEVEL_INVISIBLE,

    /* The internal options are never exported, they mark options that
       are recorded for internal use only.  */
    GC_LEVEL_INTERNAL,

    /* ADD NEW ENTRIES HERE.  */

    /* The number of the above entries.  */
    GC_LEVEL_NR
  } gc_expert_level_t;

/* A description for each expert level.  */
static const struct
{
  const char *name;
} gc_level[] =
  {
    { "basic" },
    { "advanced" },
    { "expert" },
    { "invisible" },
    { "internal" }
  };


/* Option flags.  The flags which are used by the backends are defined
   by gc-opt-flags.h, included above.

   YOU MUST NOT CHANGE THE NUMBERS OF THE EXISTING FLAGS, AS THEY ARE
   PART OF THE EXTERNAL INTERFACE.  */

/* Some entries in the option list are not options, but mark the
   beginning of a new group of options.  These entries have the GROUP
   flag set.  */
#define GC_OPT_FLAG_GROUP	(1UL << 0)
/* The ARG_OPT flag for an option indicates that the argument is
   optional.  This is never set for GC_ARG_TYPE_NONE options.  */
#define GC_OPT_FLAG_ARG_OPT	(1UL << 1)
/* The LIST flag for an option indicates that the option can occur
   several times.  A comma separated list of arguments is used as the
   argument value.  */
#define GC_OPT_FLAG_LIST	(1UL << 2)


/* A human-readable description for each flag.  */
static const struct
{
  const char *name;
} gc_flag[] =
  {
    { "group" },
    { "optional arg" },
    { "list" },
    { "runtime" },
    { "default" },
    { "default desc" },
    { "no arg desc" },
    { "no change" }
  };


/* To each option, or group marker, the information in the GC_OPTION
   struct is provided.  If you change this, don't forget to update the
   option list of each component.  */
struct gc_option
{
  /* If this is NULL, then this is a terminator in an array of unknown
     length.  Otherwise, if this entry is a group marker (see FLAGS),
     then this is the name of the group described by this entry.
     Otherwise it is the name of the option described by this
     entry.  The name must not contain a colon.  */
  const char *name;

  /* The option flags.  If the GROUP flag is set, then this entry is a
     group marker, not an option, and only the fields LEVEL,
     DESC_DOMAIN and DESC are valid.  In all other cases, this entry
     describes a new option and all fields are valid.  */
  unsigned long flags;

  /* The expert level.  This field is valid for options and groups.  A
     group has the expert level of the lowest-level option in the
     group.  */
  gc_expert_level_t level;

  /* A gettext domain in which the following description can be found.
     If this is NULL, then DESC is not translated.  Valid for groups
     and options.

     Note that we try to keep the description of groups within the
     gnupg domain.

     IMPORTANT: If you add a new domain please make sure to add a code
     set switching call to the function my_dgettext further below.  */
  const char *desc_domain;

  /* A gettext description for this group or option.  If it starts
     with a '|', then the string up to the next '|' describes the
     argument, and the description follows the second '|'.

     In general enclosing these description in N_() is not required
     because the description should be identical to the one in the
     help menu of the respective program. */
  const char *desc;

  /* The following fields are only valid for options.  */

  /* The type of the option argument.  */
  gc_arg_type_t arg_type;

  /* The backend that implements this option.  */
  gc_backend_t backend;

  /* The following fields are set to NULL at startup (because all
     option's are declared as static variables).  They are at the end
     of the list so that they can be omitted from the option
     declarations.  */

  /* This is true if the option is supported by this version of the
     backend.  */
  int active;

  /* The default value for this option.  This is NULL if the option is
     not present in the backend, the empty string if no default is
     available, and otherwise a quoted string.  */
  char *default_value;

  /* The default argument is only valid if the "optional arg" flag is
     set, and specifies the default argument (value) that is used if
     the argument is omitted.  */
  char *default_arg;

  /* The current value of this option.  */
  char *value;

  /* The new flags for this option.  The only defined flag is actually
     GC_OPT_FLAG_DEFAULT, and it means that the option should be
     deleted.  In this case, NEW_VALUE is NULL.  */
  unsigned long new_flags;

  /* The new value of this option.  */
  char *new_value;
};
typedef struct gc_option gc_option_t;

/* Use this macro to terminate an option list.  */
#define GC_OPTION_NULL { NULL }


#ifndef BUILD_WITH_AGENT
#define gc_options_gpg_agent NULL
#else
/* The options of the GC_COMPONENT_GPG_AGENT component.  */
static gc_option_t gc_options_gpg_agent[] =
 {
   /* The configuration file to which we write the changes.  */
   { GPGCONF_NAME"-" GPG_AGENT_NAME ".conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG_AGENT },

   { "Monitor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the diagnostic output") },
   { "verbose", GC_OPT_FLAG_LIST|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "verbose",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "quiet", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "be somewhat more quiet",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "no-greeting", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },

   { "Configuration",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the configuration") },
   { "options", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", "|FILE|read options from FILE",
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG_AGENT },
   { "disable-scdaemon", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", "do not use the SCdaemon",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "enable-ssh-support", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "enable ssh support",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "ssh-fingerprint-digest",
     GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_EXPERT,
     "gnupg", "|ALGO|use ALGO to show ssh fingerprints",
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG_AGENT },
   { "enable-putty-support", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "enable putty support",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "enable-extended-key-format", GC_OPT_FLAG_RUNTIME, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },

   { "Debug",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options useful for debugging") },
   { "debug-level", GC_OPT_FLAG_ARG_OPT|GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", "|LEVEL|set the debugging level to LEVEL",
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG_AGENT },
   { "log-file", GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", N_("|FILE|write server mode logs to FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG_AGENT },
   { "faked-system-time", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },

   { "Security",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the security") },
   { "default-cache-ttl", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_BASIC, "gnupg",
     "|N|expire cached PINs after N seconds",
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "default-cache-ttl-ssh", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_ADVANCED, "gnupg",
     N_("|N|expire SSH keys after N seconds"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "max-cache-ttl", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("|N|set maximum PIN cache lifetime to N seconds"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "max-cache-ttl-ssh", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("|N|set maximum SSH key lifetime to N seconds"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "ignore-cache-for-signing", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_BASIC, "gnupg", "do not use the PIN cache when signing",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "allow-emacs-pinentry", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_ADVANCED,
     "gnupg", "allow passphrase to be prompted through Emacs",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "grab", GC_OPT_FLAG_RUNTIME, GC_LEVEL_EXPERT,
     "gnupg", NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "no-allow-external-cache", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_BASIC, "gnupg", "disallow the use of an external password cache",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "no-allow-mark-trusted", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_ADVANCED, "gnupg", "disallow clients to mark keys as \"trusted\"",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "no-allow-loopback-pinentry", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg", "disallow caller to override the pinentry",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },

   { "Passphrase policy",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options enforcing a passphrase policy") },
   { "enforce-passphrase-constraints", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("do not allow bypassing the passphrase policy"),
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "min-passphrase-len", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_ADVANCED, "gnupg",
     N_("|N|set minimal required length for new passphrases to N"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "min-passphrase-nonalpha", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("|N|require at least N non-alpha characters for a new passphrase"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "check-passphrase-pattern", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT,
     "gnupg", N_("|FILE|check new passphrases against pattern in FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG_AGENT },
   { "max-passphrase-days", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("|N|expire the passphrase after N days"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },
   { "enable-passphrase-history", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_EXPERT, "gnupg",
     N_("do not allow the reuse of old passphrases"),
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG_AGENT },
   { "pinentry-timeout", GC_OPT_FLAG_RUNTIME,
     GC_LEVEL_ADVANCED, "gnupg",
     N_("|N|set the Pinentry timeout to N seconds"),
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPG_AGENT },

   GC_OPTION_NULL
 };
#endif /*BUILD_WITH_AGENT*/


#ifndef BUILD_WITH_SCDAEMON
#define gc_options_scdaemon NULL
#else
/* The options of the GC_COMPONENT_SCDAEMON component.  */
static gc_option_t gc_options_scdaemon[] =
 {
   /* The configuration file to which we write the changes.  */
   { GPGCONF_NAME"-"SCDAEMON_NAME".conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_SCDAEMON },

   { "Monitor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the diagnostic output") },
   { "verbose", GC_OPT_FLAG_LIST|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "verbose",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },
   { "quiet", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "be somewhat more quiet",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },
   { "no-greeting", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },

   { "Configuration",
     GC_OPT_FLAG_GROUP, GC_LEVEL_EXPERT,
     "gnupg", N_("Options controlling the configuration") },
   { "options", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", "|FILE|read options from FILE",
     GC_ARG_TYPE_FILENAME, GC_BACKEND_SCDAEMON },
   { "reader-port", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "|N|connect to reader at port N",
     GC_ARG_TYPE_STRING, GC_BACKEND_SCDAEMON },
   { "ctapi-driver", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", "|NAME|use NAME as ct-API driver",
     GC_ARG_TYPE_STRING, GC_BACKEND_SCDAEMON },
   { "pcsc-driver", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", "|NAME|use NAME as PC/SC driver",
     GC_ARG_TYPE_STRING, GC_BACKEND_SCDAEMON },
   { "disable-ccid", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_EXPERT,
     "gnupg", "do not use the internal CCID driver",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },
   { "disable-pinpad", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "do not use a reader's pinpad",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },
   { "enable-pinpad-varlen",
     GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "use variable length input for pinpad",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },
   { "card-timeout", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "|N|disconnect the card after N seconds of inactivity",
     GC_ARG_TYPE_UINT32, GC_BACKEND_SCDAEMON },

   { "Debug",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options useful for debugging") },
   { "debug-level", GC_OPT_FLAG_ARG_OPT|GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", "|LEVEL|set the debugging level to LEVEL",
     GC_ARG_TYPE_STRING, GC_BACKEND_SCDAEMON },
   { "log-file", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_ADVANCED,
     "gnupg", N_("|FILE|write a log to FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_SCDAEMON },

   { "Security",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the security") },
   { "deny-admin", GC_OPT_FLAG_NONE|GC_OPT_FLAG_RUNTIME, GC_LEVEL_BASIC,
     "gnupg", "deny the use of admin card commands",
     GC_ARG_TYPE_NONE, GC_BACKEND_SCDAEMON },


   GC_OPTION_NULL
 };
#endif /*BUILD_WITH_SCDAEMON*/

#ifndef BUILD_WITH_GPG
#define gc_options_gpg NULL
#else
/* The options of the GC_COMPONENT_GPG component.  */
static gc_option_t gc_options_gpg[] =
 {
   /* The configuration file to which we write the changes.  */
   { GPGCONF_NAME"-"GPG_NAME".conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG },

   { "Monitor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the diagnostic output") },
   { "verbose", GC_OPT_FLAG_LIST, GC_LEVEL_BASIC,
     "gnupg", "verbose",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG },
   { "quiet", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "be somewhat more quiet",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG },
   { "no-greeting", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG },

   { "Configuration",
     GC_OPT_FLAG_GROUP, GC_LEVEL_EXPERT,
     "gnupg", N_("Options controlling the configuration") },
   { "default-key", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("|NAME|use NAME as default secret key"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "encrypt-to", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("|NAME|encrypt to user ID NAME as well"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "group", GC_OPT_FLAG_LIST, GC_LEVEL_ADVANCED,
     "gnupg", N_("|SPEC|set up email aliases"),
     GC_ARG_TYPE_ALIAS_LIST, GC_BACKEND_GPG },
   { "options", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG },
   { "compliance", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "default-new-key-algo", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "default_pubkey_algo",
     (GC_OPT_FLAG_ARG_OPT|GC_OPT_FLAG_NO_CHANGE), GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "trust-model",
     GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },


   { "Debug",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options useful for debugging") },
   { "debug-level", GC_OPT_FLAG_ARG_OPT, GC_LEVEL_ADVANCED,
     "gnupg", "|LEVEL|set the debugging level to LEVEL",
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "log-file", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", N_("|FILE|write server mode logs to FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPG },
/*    { "faked-system-time", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE, */
/*      NULL, NULL, */
/*      GC_ARG_TYPE_UINT32, GC_BACKEND_GPG }, */

   { "Keyserver",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Configuration for Keyservers") },
   { "keyserver", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", N_("|URL|use keyserver at URL"), /* Deprecated - use dirmngr */
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "allow-pka-lookup", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("allow PKA lookups (DNS requests)"),
     GC_ARG_TYPE_NONE, GC_BACKEND_GPG },
   { "auto-key-locate", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", N_("|MECHANISMS|use MECHANISMS to locate keys by mail address"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPG },
   { "auto-key-retrieve", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL, GC_ARG_TYPE_NONE, GC_BACKEND_GPG },


   GC_OPTION_NULL
 };
#endif /*BUILD_WITH_GPG*/


#ifndef BUILD_WITH_GPGSM
#define gc_options_gpgsm NULL
#else
/* The options of the GC_COMPONENT_GPGSM component.  */
static gc_option_t gc_options_gpgsm[] =
 {
   /* The configuration file to which we write the changes.  */
   { GPGCONF_NAME"-"GPGSM_NAME".conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_GPGSM },

   { "Monitor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the diagnostic output") },
   { "verbose", GC_OPT_FLAG_LIST, GC_LEVEL_BASIC,
     "gnupg", "verbose",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "quiet", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "be somewhat more quiet",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "no-greeting", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },

   { "Configuration",
     GC_OPT_FLAG_GROUP, GC_LEVEL_EXPERT,
     "gnupg", N_("Options controlling the configuration") },
   { "default-key", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("|NAME|use NAME as default secret key"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },
   { "encrypt-to", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("|NAME|encrypt to user ID NAME as well"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },
   { "options", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", "|FILE|read options from FILE",
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPGSM },
   { "prefer-system-dirmngr", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", "use system's dirmngr if available",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "disable-dirmngr", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", N_("disable all access to the dirmngr"),
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "p12-charset", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", N_("|NAME|use encoding NAME for PKCS#12 passphrases"),
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },
   { "keyserver", GC_OPT_FLAG_LIST, GC_LEVEL_BASIC,
     "gnupg", N_("|SPEC|use this keyserver to lookup keys"),
     GC_ARG_TYPE_LDAP_SERVER, GC_BACKEND_GPGSM },
   { "default_pubkey_algo",
     (GC_OPT_FLAG_ARG_OPT|GC_OPT_FLAG_NO_CHANGE), GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },

   { "Debug",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options useful for debugging") },
   { "debug-level", GC_OPT_FLAG_ARG_OPT, GC_LEVEL_ADVANCED,
     "gnupg", "|LEVEL|set the debugging level to LEVEL",
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },
   { "log-file", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", N_("|FILE|write server mode logs to FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_GPGSM },
   { "faked-system-time", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_UINT32, GC_BACKEND_GPGSM },

   { "Security",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the security") },
   { "disable-crl-checks", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "never consult a CRL",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "enable-crl-checks", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "disable-trusted-cert-crl-check", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", N_("do not check CRLs for root certificates"),
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "enable-ocsp", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", "check validity using OCSP",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "include-certs", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "gnupg", "|N|number of certificates to include",
     GC_ARG_TYPE_INT32, GC_BACKEND_GPGSM },
   { "disable-policy-checks", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", "do not check certificate policies",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "auto-issuer-key-retrieve", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", "fetch missing issuer certificates",
     GC_ARG_TYPE_NONE, GC_BACKEND_GPGSM },
   { "cipher-algo", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", "|NAME|use cipher algorithm NAME",
     GC_ARG_TYPE_STRING, GC_BACKEND_GPGSM },

   GC_OPTION_NULL
 };
#endif /*BUILD_WITH_GPGSM*/


#ifndef BUILD_WITH_DIRMNGR
#define gc_options_dirmngr NULL
#else
/* The options of the GC_COMPONENT_DIRMNGR component.  */
static gc_option_t gc_options_dirmngr[] =
 {
   /* The configuration file to which we write the changes.  */
   { GPGCONF_NAME"-"DIRMNGR_NAME".conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_DIRMNGR },

   { "Monitor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the diagnostic output") },
   { "verbose", GC_OPT_FLAG_LIST, GC_LEVEL_BASIC,
     "dirmngr", "verbose",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "quiet", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "be somewhat more quiet",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "no-greeting", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },

   { "Format",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the format of the output") },
   { "sh", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "sh-style command output",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "csh", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "csh-style command output",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },

   { "Configuration",
     GC_OPT_FLAG_GROUP, GC_LEVEL_EXPERT,
     "gnupg", N_("Options controlling the configuration") },
   { "options", GC_OPT_FLAG_NONE, GC_LEVEL_EXPERT,
     "dirmngr", "|FILE|read options from FILE",
     GC_ARG_TYPE_FILENAME, GC_BACKEND_DIRMNGR },
   { "resolver-timeout", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_INT32, GC_BACKEND_DIRMNGR },
   { "nameserver", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },

   { "Debug",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Options useful for debugging") },
   { "debug-level", GC_OPT_FLAG_ARG_OPT, GC_LEVEL_ADVANCED,
     "dirmngr", "|LEVEL|set the debugging level to LEVEL",
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },
   { "no-detach", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "do not detach from the console",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "log-file", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", N_("|FILE|write server mode logs to FILE"),
     GC_ARG_TYPE_FILENAME, GC_BACKEND_DIRMNGR },
   { "debug-wait", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_UINT32, GC_BACKEND_DIRMNGR },
   { "faked-system-time", GC_OPT_FLAG_NONE, GC_LEVEL_INVISIBLE,
     NULL, NULL,
     GC_ARG_TYPE_UINT32, GC_BACKEND_DIRMNGR },

   { "Enforcement",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the interactivity and enforcement") },
   { "batch", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "run without asking a user",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "force", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "force loading of outdated CRLs",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "allow-version-check", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "allow online software version check",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },

   { "Tor",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Options controlling the use of Tor") },
   { "use-tor", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "route all network traffic via TOR",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },

   { "Keyserver",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Configuration for Keyservers") },
   { "keyserver", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "gnupg", N_("|URL|use keyserver at URL"),
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },

   { "HTTP",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Configuration for HTTP servers") },
   { "disable-http", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "inhibit the use of HTTP",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ignore-http-dp", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "ignore HTTP CRL distribution points",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "http-proxy", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "|URL|redirect all HTTP requests to URL",
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },
   { "honor-http-proxy", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "gnupg", N_("use system's HTTP proxy setting"),
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },

   { "LDAP",
     GC_OPT_FLAG_GROUP, GC_LEVEL_BASIC,
     "gnupg", N_("Configuration of LDAP servers to use") },
   { "disable-ldap", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "inhibit the use of LDAP",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ignore-ldap-dp", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "ignore LDAP CRL distribution points",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ldap-proxy", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "|HOST|use HOST for LDAP queries",
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },
   { "only-ldap-proxy", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "do not use fallback hosts with --ldap-proxy",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "add-servers", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "add new servers discovered in CRL distribution points"
     " to serverlist", GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ldaptimeout", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "|N|set LDAP timeout to N seconds",
     GC_ARG_TYPE_UINT32, GC_BACKEND_DIRMNGR },
   /* The following entry must not be removed, as it is required for
      the GC_BACKEND_DIRMNGR_LDAP_SERVER_LIST.  */
   { "ldapserverlist-file",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     "dirmngr", "|FILE|read LDAP server list from FILE",
     GC_ARG_TYPE_FILENAME, GC_BACKEND_DIRMNGR },
   /* This entry must come after at least one entry for
      GC_BACKEND_DIRMNGR in this component, so that the entry for
      "ldapserverlist-file will be initialized before this one.  */
   { "LDAP Server", GC_OPT_FLAG_ARG_OPT|GC_OPT_FLAG_LIST, GC_LEVEL_BASIC,
     "gnupg", N_("LDAP server list"),
     GC_ARG_TYPE_LDAP_SERVER, GC_BACKEND_DIRMNGR_LDAP_SERVER_LIST },
   { "max-replies", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "|N|do not return more than N items in one query",
     GC_ARG_TYPE_UINT32, GC_BACKEND_DIRMNGR },

   { "OCSP",
     GC_OPT_FLAG_GROUP, GC_LEVEL_ADVANCED,
     "gnupg", N_("Configuration for OCSP") },
   { "allow-ocsp", GC_OPT_FLAG_NONE, GC_LEVEL_BASIC,
     "dirmngr", "allow sending OCSP requests",
     GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ignore-ocsp-service-url", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "ignore certificate contained OCSP service URLs",
      GC_ARG_TYPE_NONE, GC_BACKEND_DIRMNGR },
   { "ocsp-responder", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "|URL|use OCSP responder at URL",
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },
   { "ocsp-signer", GC_OPT_FLAG_NONE, GC_LEVEL_ADVANCED,
     "dirmngr", "|FPR|OCSP response signed by FPR",
     GC_ARG_TYPE_STRING, GC_BACKEND_DIRMNGR },


   GC_OPTION_NULL
 };
#endif /*BUILD_WITH_DIRMNGR*/


/* The options of the GC_COMPONENT_PINENTRY component.  */
static gc_option_t gc_options_pinentry[] =
 {
   /* A dummy option to allow gc_component_list_components to find the
      pinentry backend.  Needs to be a conf file. */
   { GPGCONF_NAME"-pinentry.conf",
     GC_OPT_FLAG_NONE, GC_LEVEL_INTERNAL,
     NULL, NULL, GC_ARG_TYPE_FILENAME, GC_BACKEND_PINENTRY },

   GC_OPTION_NULL
 };



/* Component system.  Each component is a set of options that can be
   configured at the same time.  If you change this, don't forget to
   update GC_COMPONENT below.  */
typedef enum
  {
    /* The classic GPG for OpenPGP.  */
    GC_COMPONENT_GPG,

    /* The GPG Agent.  */
    GC_COMPONENT_GPG_AGENT,

    /* The Smardcard Daemon.  */
    GC_COMPONENT_SCDAEMON,

    /* GPG for S/MIME.  */
    GC_COMPONENT_GPGSM,

    /* The LDAP Directory Manager for CRLs.  */
    GC_COMPONENT_DIRMNGR,

    /* The external Pinentry.  */
    GC_COMPONENT_PINENTRY,

    /* The number of components.  */
    GC_COMPONENT_NR
  } gc_component_t;


/* The information associated with each component.  */
static const struct
{
  /* The name of this component.  Must not contain a colon (':')
     character.  */
  const char *name;

  /* The gettext domain for the description DESC.  If this is NULL,
     then the description is not translated.  */
  const char *desc_domain;

  /* The description for this domain.  */
  const char *desc;

  /* The list of options for this component, terminated by
     GC_OPTION_NULL.  */
  gc_option_t *options;
} gc_component[] =
  {
    { "gpg",      "gnupg", N_("OpenPGP"), gc_options_gpg },
    { "gpg-agent","gnupg", N_("Private Keys"), gc_options_gpg_agent },
    { "scdaemon", "gnupg", N_("Smartcards"), gc_options_scdaemon },
    { "gpgsm",    "gnupg", N_("S/MIME"), gc_options_gpgsm },
    { "dirmngr",  "gnupg", N_("Network"), gc_options_dirmngr },
    { "pinentry", "gnupg", N_("Passphrase Entry"), gc_options_pinentry }
  };



/* Structure used to collect error output of the backend programs.  */
struct error_line_s;
typedef struct error_line_s *error_line_t;
struct error_line_s
{
  error_line_t next;   /* Link to next item.  */
  const char *fname;   /* Name of the config file (points into BUFFER).  */
  unsigned int lineno; /* Line number of the config file.  */
  const char *errtext; /* Text of the error message (points into BUFFER).  */
  char buffer[1];  /* Helper buffer.  */
};




/* Initialization and finalization.  */

static void
gc_option_free (gc_option_t *o)
{
  if (o == NULL || o->name == NULL)
    return;

  xfree (o->value);
  gc_option_free (o + 1);
}

static void
gc_components_free (void)
{
  int i;
  for (i = 0; i < DIM (gc_component); i++)
    gc_option_free (gc_component[i].options);
}

void
gc_components_init (void)
{
  atexit (gc_components_free);
}



/* Engine specific support.  */
static void
gpg_agent_runtime_change (int killflag)
{
  gpg_error_t err = 0;
  const char *pgmname;
  const char *argv[5];
  pid_t pid = (pid_t)(-1);
  char *abs_homedir = NULL;
  int i = 0;

  pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CONNECT_AGENT);
  if (!gnupg_default_homedir_p ())
    {
      abs_homedir = make_absfilename_try (gnupg_homedir (), NULL);
      if (!abs_homedir)
        err = gpg_error_from_syserror ();

      argv[i++] = "--homedir";
      argv[i++] = abs_homedir;
    }
  argv[i++] = "--no-autostart";
  argv[i++] = killflag? "KILLAGENT" : "RELOADAGENT";
  argv[i++] = NULL;

  if (!err)
    err = gnupg_spawn_process_fd (pgmname, argv, -1, -1, -1, &pid);
  if (!err)
    err = gnupg_wait_process (pgmname, pid, 1, NULL);
  if (err)
    gc_error (0, 0, "error running '%s %s': %s",
              pgmname, argv[1], gpg_strerror (err));
  gnupg_release_process (pid);
  xfree (abs_homedir);
}


static void
scdaemon_runtime_change (int killflag)
{
  gpg_error_t err = 0;
  const char *pgmname;
  const char *argv[9];
  pid_t pid = (pid_t)(-1);
  char *abs_homedir = NULL;
  int i = 0;

  (void)killflag;  /* For scdaemon kill and reload are synonyms.  */

  /* We use "GETINFO app_running" to see whether the agent is already
     running and kill it only in this case.  This avoids an explicit
     starting of the agent in case it is not yet running.  There is
     obviously a race condition but that should not harm too much.  */

  pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CONNECT_AGENT);
  if (!gnupg_default_homedir_p ())
    {
      abs_homedir = make_absfilename_try (gnupg_homedir (), NULL);
      if (!abs_homedir)
        err = gpg_error_from_syserror ();

      argv[i++] = "--homedir";
      argv[i++] = abs_homedir;
    }
  argv[i++] = "-s";
  argv[i++] = "--no-autostart";
  argv[i++] = "GETINFO scd_running";
  argv[i++] = "/if ${! $?}";
  argv[i++] = "scd killscd";
  argv[i++] = "/end";
  argv[i++] = NULL;

  if (!err)
    err = gnupg_spawn_process_fd (pgmname, argv, -1, -1, -1, &pid);
  if (!err)
    err = gnupg_wait_process (pgmname, pid, 1, NULL);
  if (err)
    gc_error (0, 0, "error running '%s %s': %s",
              pgmname, argv[4], gpg_strerror (err));
  gnupg_release_process (pid);
  xfree (abs_homedir);
}


static void
dirmngr_runtime_change (int killflag)
{
  gpg_error_t err = 0;
  const char *pgmname;
  const char *argv[6];
  pid_t pid = (pid_t)(-1);
  char *abs_homedir = NULL;

  pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CONNECT_AGENT);
  argv[0] = "--no-autostart";
  argv[1] = "--dirmngr";
  argv[2] = killflag? "KILLDIRMNGR" : "RELOADDIRMNGR";
  if (gnupg_default_homedir_p ())
    argv[3] = NULL;
  else
    {
      abs_homedir = make_absfilename_try (gnupg_homedir (), NULL);
      if (!abs_homedir)
        err = gpg_error_from_syserror ();

      argv[3] = "--homedir";
      argv[4] = abs_homedir;
      argv[5] = NULL;
    }

  if (!err)
    err = gnupg_spawn_process_fd (pgmname, argv, -1, -1, -1, &pid);
  if (!err)
    err = gnupg_wait_process (pgmname, pid, 1, NULL);
  if (err)
    gc_error (0, 0, "error running '%s %s': %s",
              pgmname, argv[2], gpg_strerror (err));
  gnupg_release_process (pid);
  xfree (abs_homedir);
}


/* Launch the gpg-agent or the dirmngr if not already running.  */
gpg_error_t
gc_component_launch (int component)
{
  gpg_error_t err;
  const char *pgmname;
  const char *argv[3];
  int i;
  pid_t pid;

  if (component < 0)
    {
      err = gc_component_launch (GC_COMPONENT_GPG_AGENT);
      if (!err)
        err = gc_component_launch (GC_COMPONENT_DIRMNGR);
      return err;
    }

  if (!(component == GC_COMPONENT_GPG_AGENT
        || component == GC_COMPONENT_DIRMNGR))
    {
      es_fputs (_("Component not suitable for launching"), es_stderr);
      es_putc ('\n', es_stderr);
      exit (1);
    }

  pgmname = gnupg_module_name (GNUPG_MODULE_NAME_CONNECT_AGENT);
  i = 0;
  if (component == GC_COMPONENT_DIRMNGR)
    argv[i++] = "--dirmngr";
  argv[i++] = "NOP";
  argv[i] = NULL;

  err = gnupg_spawn_process_fd (pgmname, argv, -1, -1, -1, &pid);
  if (!err)
    err = gnupg_wait_process (pgmname, pid, 1, NULL);
  if (err)
    gc_error (0, 0, "error running '%s%s%s': %s",
              pgmname,
              component == GC_COMPONENT_DIRMNGR? " --dirmngr":"",
              " NOP",
              gpg_strerror (err));
  gnupg_release_process (pid);
  return err;
}


/* Unconditionally restart COMPONENT.  */
void
gc_component_kill (int component)
{
  int runtime[GC_BACKEND_NR];
  gc_option_t *option;
  gc_backend_t backend;

  /* Set a flag for the backends to be reloaded.  */
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    runtime[backend] = 0;

  if (component < 0)
    {
      for (component = 0; component < GC_COMPONENT_NR; component++)
        {
          option = gc_component[component].options;
          for (; option && option->name; option++)
            runtime[option->backend] = 1;
        }
    }
  else
    {
      assert (component < GC_COMPONENT_NR);
      option = gc_component[component].options;
      for (; option && option->name; option++)
        runtime[option->backend] = 1;
    }

  /* Do the restart for the selected backends.  */
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    {
      if (runtime[backend] && gc_backend[backend].runtime_change)
        (*gc_backend[backend].runtime_change) (1);
    }
}


/* Unconditionally reload COMPONENT or all components if COMPONENT is -1.  */
void
gc_component_reload (int component)
{
  int runtime[GC_BACKEND_NR];
  gc_option_t *option;
  gc_backend_t backend;

  /* Set a flag for the backends to be reloaded.  */
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    runtime[backend] = 0;

  if (component < 0)
    {
      for (component = 0; component < GC_COMPONENT_NR; component++)
        {
          option = gc_component[component].options;
          for (; option && option->name; option++)
            runtime[option->backend] = 1;
        }
    }
  else
    {
      assert (component < GC_COMPONENT_NR);
      option = gc_component[component].options;
      for (; option && option->name; option++)
        runtime[option->backend] = 1;
    }

  /* Do the reload for all selected backends.  */
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    {
      if (runtime[backend] && gc_backend[backend].runtime_change)
        (*gc_backend[backend].runtime_change) (0);
    }
}



/* More or less Robust version of dgettext.  It has the side effect of
   switching the codeset to utf-8 because this is what we want to
   output.  In theory it is possible to keep the original code set and
   switch back for regular disgnostic output (redefine "_(" for that)
   but given the natur of this tool, being something invoked from
   other pograms, it does not make much sense.  */
static const char *
my_dgettext (const char *domain, const char *msgid)
{
#ifdef USE_SIMPLE_GETTEXT
  if (domain)
    {
      static int switched_codeset;
      char *text;

      if (!switched_codeset)
        {
          switched_codeset = 1;
          gettext_use_utf8 (1);
        }

      if (!strcmp (domain, "gnupg"))
        domain = PACKAGE_GT;

      /* FIXME: we have no dgettext, thus we can't switch.  */

      text = (char*)gettext (msgid);
      return text ? text : msgid;
    }
  else
    return msgid;
#elif defined(ENABLE_NLS)
  if (domain)
    {
      static int switched_codeset;
      char *text;

      if (!switched_codeset)
        {
          switched_codeset = 1;
          bind_textdomain_codeset (PACKAGE_GT, "utf-8");

          bindtextdomain (DIRMNGR_NAME, LOCALEDIR);
          bind_textdomain_codeset (DIRMNGR_NAME, "utf-8");

        }

      /* Note: This is a hack to actually use the gnupg2 domain as
         long we are in a transition phase where gnupg 1.x and 1.9 may
         coexist. */
      if (!strcmp (domain, "gnupg"))
        domain = PACKAGE_GT;

      text = dgettext (domain, msgid);
      return text ? text : msgid;
    }
  else
    return msgid;
#else
  (void)domain;
  return msgid;
#endif
}


/* Percent-Escape special characters.  The string is valid until the
   next invocation of the function.  */
char *
gc_percent_escape (const char *src)
{
  static char *esc_str;
  static int esc_str_len;
  int new_len = 3 * strlen (src) + 1;
  char *dst;

  if (esc_str_len < new_len)
    {
      char *new_esc_str = realloc (esc_str, new_len);
      if (!new_esc_str)
	gc_error (1, errno, "can not escape string");
      esc_str = new_esc_str;
      esc_str_len = new_len;
    }

  dst = esc_str;
  while (*src)
    {
      if (*src == '%')
	{
	  *(dst++) = '%';
	  *(dst++) = '2';
	  *(dst++) = '5';
	}
      else if (*src == ':')
	{
	  /* The colon is used as field separator.  */
	  *(dst++) = '%';
	  *(dst++) = '3';
	  *(dst++) = 'a';
	}
      else if (*src == ',')
	{
	  /* The comma is used as list separator.  */
	  *(dst++) = '%';
	  *(dst++) = '2';
	  *(dst++) = 'c';
	}
      else if (*src == '\n')
	{
	  /* The newline is problematic in a line-based format.  */
	  *(dst++) = '%';
	  *(dst++) = '0';
	  *(dst++) = 'a';
	}
      else
	*(dst++) = *(src);
      src++;
    }
  *dst = '\0';
  return esc_str;
}



/* Percent-Deescape special characters.  The string is valid until the
   next invocation of the function.  */
static char *
percent_deescape (const char *src)
{
  static char *str;
  static int str_len;
  int new_len = 3 * strlen (src) + 1;
  char *dst;

  if (str_len < new_len)
    {
      char *new_str = realloc (str, new_len);
      if (!new_str)
	gc_error (1, errno, "can not deescape string");
      str = new_str;
      str_len = new_len;
    }

  dst = str;
  while (*src)
    {
      if (*src == '%')
	{
	  int val = hextobyte (src + 1);

	  if (val < 0)
	    gc_error (1, 0, "malformed end of string %s", src);

	  *(dst++) = (char) val;
	  src += 3;
	}
      else
	*(dst++) = *(src++);
    }
  *dst = '\0';
  return str;
}


/* List all components that are available.  */
void
gc_component_list_components (estream_t out)
{
  gc_component_t component;
  gc_option_t *option;
  gc_backend_t backend;
  int backend_seen[GC_BACKEND_NR];
  const char *desc;
  const char *pgmname;

  for (component = 0; component < GC_COMPONENT_NR; component++)
    {
      option = gc_component[component].options;
      if (option)
        {
          for (backend = 0; backend < GC_BACKEND_NR; backend++)
            backend_seen[backend] = 0;

          pgmname = "";
          for (; option && option->name; option++)
            {
              if ((option->flags & GC_OPT_FLAG_GROUP))
                continue;
              backend = option->backend;
              if (backend_seen[backend])
                continue;
              backend_seen[backend] = 1;
              assert (backend != GC_BACKEND_ANY);
              if (gc_backend[backend].program
                  && !gc_backend[backend].module_name)
                continue;
              pgmname = gnupg_module_name (gc_backend[backend].module_name);
              break;
            }

          desc = gc_component[component].desc;
          desc = my_dgettext (gc_component[component].desc_domain, desc);
          es_fprintf (out, "%s:%s:",
                      gc_component[component].name,  gc_percent_escape (desc));
          es_fprintf (out, "%s\n",  gc_percent_escape (pgmname));
        }
    }
}



static int
all_digits_p (const char *p, size_t len)
{
  if (!len)
    return 0; /* No. */
  for (; len; len--, p++)
    if (!isascii (*p) || !isdigit (*p))
      return 0; /* No.  */
  return 1; /* Yes.  */
}


/* Collect all error lines from stream FP. Only lines prefixed with
   TAG are considered.  Returns a list of error line items (which may
   be empty).  There is no error return.  */
static error_line_t
collect_error_output (estream_t fp, const char *tag)
{
  char buffer[1024];
  char *p, *p2, *p3;
  int c, cont_line;
  unsigned int pos;
  error_line_t eitem, errlines, *errlines_tail;
  size_t taglen = strlen (tag);

  errlines = NULL;
  errlines_tail = &errlines;
  pos = 0;
  cont_line = 0;
  while ((c=es_getc (fp)) != EOF)
    {
      buffer[pos++] = c;
      if (pos >= sizeof buffer - 5 || c == '\n')
        {
          buffer[pos - (c == '\n')] = 0;
          if (cont_line)
            ; /*Ignore continuations of previous line. */
          else if (!strncmp (buffer, tag, taglen) && buffer[taglen] == ':')
            {
              /* "gpgsm: foo:4: bla" */
              /* Yep, we are interested in this line.  */
              p = buffer + taglen + 1;
              while (*p == ' ' || *p == '\t')
                p++;
              trim_trailing_spaces (p); /* Get rid of extra CRs.  */
              if (!*p)
                ; /* Empty lines are ignored.  */
              else if ( (p2 = strchr (p, ':')) && (p3 = strchr (p2+1, ':'))
                        && all_digits_p (p2+1, p3 - (p2+1)))
                {
                  /* Line in standard compiler format.  */
                  p3++;
                  while (*p3 == ' ' || *p3 == '\t')
                    p3++;
                  eitem = xmalloc (sizeof *eitem + strlen (p));
                  eitem->next = NULL;
                  strcpy (eitem->buffer, p);
                  eitem->fname = eitem->buffer;
                  eitem->buffer[p2-p] = 0;
                  eitem->errtext = eitem->buffer + (p3 - p);
                  /* (we already checked that there are only ascii
                     digits followed by a colon) */
                  eitem->lineno = 0;
                  for (p2++; isdigit (*p2); p2++)
                    eitem->lineno = eitem->lineno*10 + (*p2 - '0');
                  *errlines_tail = eitem;
                  errlines_tail = &eitem->next;
                }
              else
                {
                  /* Other error output.  */
                  eitem = xmalloc (sizeof *eitem + strlen (p));
                  eitem->next = NULL;
                  strcpy (eitem->buffer, p);
                  eitem->fname = NULL;
                  eitem->errtext = eitem->buffer;
                  eitem->lineno = 0;
                  *errlines_tail = eitem;
                  errlines_tail = &eitem->next;
                }
            }
          pos = 0;
          /* If this was not a complete line mark that we are in a
             continuation.  */
          cont_line = (c != '\n');
        }
    }

  /* We ignore error lines not terminated by a LF.  */
  return errlines;
}


/* Check the options of a single component.  Returns 0 if everything
   is OK.  */
int
gc_component_check_options (int component, estream_t out, const char *conf_file)
{
  gpg_error_t err;
  unsigned int result;
  int backend_seen[GC_BACKEND_NR];
  gc_backend_t backend;
  gc_option_t *option;
  const char *pgmname;
  const char *argv[4];
  int i;
  pid_t pid;
  int exitcode;
  estream_t errfp;
  error_line_t errlines;

  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    backend_seen[backend] = 0;

  option = gc_component[component].options;
  for (; option && option->name; option++)
    {
      if ((option->flags & GC_OPT_FLAG_GROUP))
	continue;
      backend = option->backend;
      if (backend_seen[backend])
	continue;
      backend_seen[backend] = 1;
      assert (backend != GC_BACKEND_ANY);
      if (!gc_backend[backend].program)
	continue;
      if (!gc_backend[backend].module_name)
	continue;

      break;
    }
  if (! option || ! option->name)
    return 0;

  pgmname = gnupg_module_name (gc_backend[backend].module_name);
  i = 0;
  if (conf_file)
    {
      argv[i++] = "--options";
      argv[i++] = conf_file;
    }
  if (component == GC_COMPONENT_PINENTRY)
    argv[i++] = "--version";
  else
    argv[i++] = "--gpgconf-test";
  argv[i++] = NULL;

  result = 0;
  errlines = NULL;
  err = gnupg_spawn_process (pgmname, argv, NULL, NULL, 0,
                             NULL, NULL, &errfp, &pid);
  if (err)
    result |= 1; /* Program could not be run.  */
  else
    {
      errlines = collect_error_output (errfp,
				       gc_component[component].name);
      if (gnupg_wait_process (pgmname, pid, 1, &exitcode))
	{
	  if (exitcode == -1)
	    result |= 1; /* Program could not be run or it
			    terminated abnormally.  */
	  result |= 2; /* Program returned an error.  */
	}
      gnupg_release_process (pid);
      es_fclose (errfp);
    }

  /* If the program could not be run, we can't tell whether
     the config file is good.  */
  if (result & 1)
    result |= 2;

  if (out)
    {
      const char *desc;
      error_line_t errptr;

      desc = gc_component[component].desc;
      desc = my_dgettext (gc_component[component].desc_domain, desc);
      es_fprintf (out, "%s:%s:",
                  gc_component[component].name, gc_percent_escape (desc));
      es_fputs (gc_percent_escape (pgmname), out);
      es_fprintf (out, ":%d:%d:", !(result & 1), !(result & 2));
      for (errptr = errlines; errptr; errptr = errptr->next)
	{
	  if (errptr != errlines)
	    es_fputs ("\n:::::", out); /* Continuation line.  */
	  if (errptr->fname)
	    es_fputs (gc_percent_escape (errptr->fname), out);
	  es_putc (':', out);
	  if (errptr->fname)
	    es_fprintf (out, "%u", errptr->lineno);
	  es_putc (':', out);
	  es_fputs (gc_percent_escape (errptr->errtext), out);
	  es_putc (':', out);
	}
      es_putc ('\n', out);
    }

  while (errlines)
    {
      error_line_t tmp = errlines->next;
      xfree (errlines);
      errlines = tmp;
    }

  return result;
}



/* Check all components that are available.  */
void
gc_check_programs (estream_t out)
{
  gc_component_t component;

  for (component = 0; component < GC_COMPONENT_NR; component++)
    gc_component_check_options (component, out, NULL);
}



/* Find the component with the name NAME.  Returns -1 if not
   found.  */
int
gc_component_find (const char *name)
{
  gc_component_t idx;

  for (idx = 0; idx < GC_COMPONENT_NR; idx++)
    {
      if (gc_component[idx].options
          && !strcmp (name, gc_component[idx].name))
	return idx;
    }
  return -1;
}


/* List the option OPTION.  */
static void
list_one_option (const gc_option_t *option, estream_t out)
{
  const char *desc = NULL;
  char *arg_name = NULL;

  if (option->desc)
    {
      desc = my_dgettext (option->desc_domain, option->desc);

      if (*desc == '|')
	{
	  const char *arg_tail = strchr (&desc[1], '|');

	  if (arg_tail)
	    {
	      int arg_len = arg_tail - &desc[1];
	      arg_name = xmalloc (arg_len + 1);
	      memcpy (arg_name, &desc[1], arg_len);
	      arg_name[arg_len] = '\0';
	      desc = arg_tail + 1;
	    }
	}
    }


  /* YOU MUST NOT REORDER THE FIELDS IN THIS OUTPUT, AS THEIR ORDER IS
     PART OF THE EXTERNAL INTERFACE.  YOU MUST NOT REMOVE ANY
     FIELDS.  */

  /* The name field.  */
  es_fprintf (out, "%s", option->name);

  /* The flags field.  */
  es_fprintf (out, ":%lu", option->flags);
  if (opt.verbose)
    {
      es_putc (' ', out);

      if (!option->flags)
	es_fprintf (out, "none");
      else
	{
	  unsigned long flags = option->flags;
	  unsigned long flag = 0;
	  unsigned long first = 1;

	  while (flags)
	    {
	      if (flags & 1)
		{
		  if (first)
		    first = 0;
		  else
		    es_putc (',', out);
		  es_fprintf (out, "%s", gc_flag[flag].name);
		}
	      flags >>= 1;
	      flag++;
	    }
	}
    }

  /* The level field.  */
  es_fprintf (out, ":%u", option->level);
  if (opt.verbose)
    es_fprintf (out, " %s", gc_level[option->level].name);

  /* The description field.  */
  es_fprintf (out, ":%s", desc ? gc_percent_escape (desc) : "");

  /* The type field.  */
  es_fprintf (out, ":%u", option->arg_type);
  if (opt.verbose)
    es_fprintf (out, " %s", gc_arg_type[option->arg_type].name);

  /* The alternate type field.  */
  es_fprintf (out, ":%u", gc_arg_type[option->arg_type].fallback);
  if (opt.verbose)
    es_fprintf (out, " %s",
                gc_arg_type[gc_arg_type[option->arg_type].fallback].name);

  /* The argument name field.  */
  es_fprintf (out, ":%s", arg_name ? gc_percent_escape (arg_name) : "");
  xfree (arg_name);

  /* The default value field.  */
  es_fprintf (out, ":%s", option->default_value ? option->default_value : "");

  /* The default argument field.  */
  es_fprintf (out, ":%s", option->default_arg ? option->default_arg : "");

  /* The value field.  */
  if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_NONE
      && (option->flags & GC_OPT_FLAG_LIST)
      && option->value)
    /* The special format "1,1,1,1,...,1" is converted to a number
       here.  */
    es_fprintf (out, ":%u", (unsigned int)((strlen (option->value) + 1) / 2));
  else
    es_fprintf (out, ":%s", option->value ? option->value : "");

  /* ADD NEW FIELDS HERE.  */

  es_putc ('\n', out);
}


/* List all options of the component COMPONENT.  */
void
gc_component_list_options (int component, estream_t out)
{
  const gc_option_t *option = gc_component[component].options;

  while (option && option->name)
    {
      /* Do not output unknown or internal options.  */
      if (!(option->flags & GC_OPT_FLAG_GROUP)
	  && (!option->active || option->level == GC_LEVEL_INTERNAL))
	{
	  option++;
	  continue;
	}

      if (option->flags & GC_OPT_FLAG_GROUP)
	{
	  const gc_option_t *group_option = option + 1;
	  gc_expert_level_t level = GC_LEVEL_NR;

	  /* The manual states that the group level is always the
	     minimum of the levels of all contained options.  Due to
	     different active options, and because it is hard to
	     maintain manually, we calculate it here.  The value in
	     the global static table is ignored.  */

	  while (group_option->name)
	    {
	      if (group_option->flags & GC_OPT_FLAG_GROUP)
		break;
	      if (group_option->level < level)
		level = group_option->level;
	      group_option++;
	    }

	  /* Check if group is empty.  */
	  if (level != GC_LEVEL_NR)
	    {
	      gc_option_t opt_copy;

	      /* Fix up the group level.  */
	      memcpy (&opt_copy, option, sizeof (opt_copy));
	      opt_copy.level = level;
	      list_one_option (&opt_copy, out);
	    }
	}
      else
	list_one_option (option, out);

      option++;
    }
}


/* Find the option NAME in component COMPONENT, for the backend
   BACKEND.  If BACKEND is GC_BACKEND_ANY, any backend will match.  */
static gc_option_t *
find_option (gc_component_t component, const char *name,
	     gc_backend_t backend)
{
  gc_option_t *option = gc_component[component].options;
  while (option->name)
    {
      if (!(option->flags & GC_OPT_FLAG_GROUP)
	  && !strcmp (option->name, name)
	  && (backend == GC_BACKEND_ANY || option->backend == backend))
	break;
      option++;
    }
  return option->name ? option : NULL;
}


/* Determine the configuration filename for the component COMPONENT
   and backend BACKEND.  */
static char *
get_config_filename (gc_component_t component, gc_backend_t backend)
{
  char *filename = NULL;
  gc_option_t *option = find_option
    (component, gc_backend[backend].option_config_filename, GC_BACKEND_ANY);
  assert (option);
  assert (option->arg_type == GC_ARG_TYPE_FILENAME);
  assert (!(option->flags & GC_OPT_FLAG_LIST));

  if (!option->active || !option->default_value)
    gc_error (1, 0, "Option %s, needed by backend %s, was not initialized",
	      gc_backend[backend].option_config_filename,
	      gc_backend[backend].name);

  if (option->value && *option->value)
    filename = percent_deescape (&option->value[1]);
  else if (option->default_value && *option->default_value)
    filename = percent_deescape (&option->default_value[1]);
  else
    filename = "";

#if HAVE_W32CE_SYSTEM
  if (!(filename[0] == '/' || filename[0] == '\\'))
#elif defined(HAVE_DOSISH_SYSTEM)
  if (!(filename[0]
        && filename[1] == ':'
        && (filename[2] == '/' || filename[2] == '\\')))
#else
  if (filename[0] != '/')
#endif
    gc_error (1, 0, "Option %s, needed by backend %s, is not absolute",
	      gc_backend[backend].option_config_filename,
	      gc_backend[backend].name);

  return filename;
}


/* Retrieve the options for the component COMPONENT from backend
   BACKEND, which we already know is a program-type backend.  */
static void
retrieve_options_from_program (gc_component_t component, gc_backend_t backend)
{
  gpg_error_t err;
  const char *pgmname;
  const char *argv[2];
  estream_t outfp;
  int exitcode;
  pid_t pid;
  char *line = NULL;
  size_t line_len = 0;
  ssize_t length;
  estream_t config;
  char *config_filename;

  pgmname = (gc_backend[backend].module_name
             ? gnupg_module_name (gc_backend[backend].module_name)
             : gc_backend[backend].program );
  argv[0] = "--gpgconf-list";
  argv[1] = NULL;

  err = gnupg_spawn_process (pgmname, argv, NULL, NULL, 0,
                             NULL, &outfp, NULL, &pid);
  if (err)
    {
      gc_error (1, 0, "could not gather active options from '%s': %s",
                pgmname, gpg_strerror (err));
    }

  while ((length = es_read_line (outfp, &line, &line_len, NULL)) > 0)
    {
      gc_option_t *option;
      char *linep;
      unsigned long flags = 0;
      char *default_value = NULL;

      /* Strip newline and carriage return, if present.  */
      while (length > 0
	     && (line[length - 1] == '\n' || line[length - 1] == '\r'))
	line[--length] = '\0';

      linep = strchr (line, ':');
      if (linep)
	*(linep++) = '\0';

      /* Extract additional flags.  Default to none.  */
      if (linep)
	{
	  char *end;
	  char *tail;

	  end = strchr (linep, ':');
	  if (end)
	    *(end++) = '\0';

	  gpg_err_set_errno (0);
	  flags = strtoul (linep, &tail, 0);
	  if (errno)
	    gc_error (1, errno, "malformed flags in option %s from %s",
                      line, pgmname);
	  if (!(*tail == '\0' || *tail == ':' || *tail == ' '))
	    gc_error (1, 0, "garbage after flags in option %s from %s",
                      line, pgmname);

	  linep = end;
	}

      /* Extract default value, if present.  Default to empty if
	 not.  */
      if (linep)
	{
	  char *end;

	  end = strchr (linep, ':');
	  if (end)
	    *(end++) = '\0';

	  if (flags & GC_OPT_FLAG_DEFAULT)
	    default_value = linep;

	  linep = end;
	}

      /* Look up the option in the component and install the
	 configuration data.  */
      option = find_option (component, line, backend);
      if (option)
	{
	  if (option->active)
	    gc_error (1, errno, "option %s returned twice from %s",
		      line, pgmname);
	  option->active = 1;

	  option->flags |= flags;
	  if (default_value && *default_value)
	    option->default_value = xstrdup (default_value);
	}
    }
  if (length < 0 || es_ferror (outfp))
    gc_error (1, errno, "error reading from %s", pgmname);
  if (es_fclose (outfp))
    gc_error (1, errno, "error closing %s", pgmname);

  err = gnupg_wait_process (pgmname, pid, 1, &exitcode);
  if (err)
    gc_error (1, 0, "running %s failed (exitcode=%d): %s",
              pgmname, exitcode, gpg_strerror (err));
  gnupg_release_process (pid);


  /* At this point, we can parse the configuration file.  */
  config_filename = get_config_filename (component, backend);

  config = es_fopen (config_filename, "r");
  if (!config)
    {
      if (errno != ENOENT)
        gc_error (0, errno, "warning: can not open config file %s",
                  config_filename);
    }
  else
    {
      while ((length = es_read_line (config, &line, &line_len, NULL)) > 0)
	{
	  char *name;
	  char *value;
	  gc_option_t *option;

	  name = line;
	  while (*name == ' ' || *name == '\t')
	    name++;
	  if (!*name || *name == '#' || *name == '\r' || *name == '\n')
	    continue;

	  value = name;
	  while (*value && *value != ' ' && *value != '\t'
		 && *value != '#' && *value != '\r' && *value != '\n')
	    value++;
	  if (*value == ' ' || *value == '\t')
	    {
	      char *end;

	      *(value++) = '\0';
	      while (*value == ' ' || *value == '\t')
		value++;

	      end = value;
	      while (*end && *end != '#' && *end != '\r' && *end != '\n')
		end++;
	      while (end > value && (end[-1] == ' ' || end[-1] == '\t'))
		end--;
	      *end = '\0';
	    }
	  else
	    *value = '\0';

	  /* Look up the option in the component and install the
	     configuration data.  */
	  option = find_option (component, line, backend);
	  if (option)
	    {
	      char *opt_value;

	      if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_NONE)
		{
		  if (*value)
		    gc_error (0, 0,
			      "warning: ignoring argument %s for option %s",
			      value, name);
		  opt_value = xstrdup ("1");
		}
	      else if (gc_arg_type[option->arg_type].fallback
		       == GC_ARG_TYPE_STRING)
		opt_value = xasprintf ("\"%s", gc_percent_escape (value));
	      else
		{
		  /* FIXME: Verify that the number is sane.  */
		  opt_value = xstrdup (value);
		}

	      /* Now enter the option into the table.  */
	      if (!(option->flags & GC_OPT_FLAG_LIST))
		{
		  if (option->value)
		    xfree (option->value);
		  option->value = opt_value;
		}
	      else
		{
		  if (!option->value)
		    option->value = opt_value;
		  else
		    {
		      char *old = option->value;
		      option->value = xasprintf ("%s,%s", old, opt_value);
		      xfree (old);
		      xfree (opt_value);
		    }
		}
	    }
	}

      if (length < 0 || es_ferror (config))
	gc_error (1, errno, "error reading from %s", config_filename);
      if (es_fclose (config))
	gc_error (1, errno, "error closing %s", config_filename);
    }

  xfree (line);
}


/* Retrieve the options for the component COMPONENT from backend
   BACKEND, which we already know is of type file list.  */
static void
retrieve_options_from_file (gc_component_t component, gc_backend_t backend)
{
  gc_option_t *list_option;
  gc_option_t *config_option;
  char *list_filename;
  gpgrt_stream_t list_file;
  char *line = NULL;
  size_t line_len = 0;
  ssize_t length;
  char *list = NULL;

  list_option = find_option (component,
			     gc_backend[backend].option_name, GC_BACKEND_ANY);
  assert (list_option);
  assert (!list_option->active);

  list_filename = get_config_filename (component, backend);
  list_file = gpgrt_fopen (list_filename, "r");
  if (!list_file)
    gc_error (0, errno, "warning: can not open list file %s", list_filename);
  else
    {

      while ((length = gpgrt_read_line (list_file, &line, &line_len, NULL)) > 0)
	{
	  char *start;
	  char *end;
	  char *new_list;

	  start = line;
	  while (*start == ' ' || *start == '\t')
	    start++;
	  if (!*start || *start == '#' || *start == '\r' || *start == '\n')
	    continue;

	  end = start;
	  while (*end && *end != '#' && *end != '\r' && *end != '\n')
	    end++;
	  /* Walk back to skip trailing white spaces.  Looks evil, but
	     works because of the conditions on START and END imposed
	     at this point (END is at least START + 1, and START is
	     not a whitespace character).  */
	  while (*(end - 1) == ' ' || *(end - 1) == '\t')
	    end--;
	  *end = '\0';
	  /* FIXME: Oh, no!  This is so lame!  Should use realloc and
	     really append.  */
	  if (list)
	    {
	      new_list = xasprintf ("%s,\"%s", list, gc_percent_escape (start));
	      xfree (list);
	      list = new_list;
	    }
	  else
	    list = xasprintf ("\"%s", gc_percent_escape (start));
	}
      if (length < 0 || gpgrt_ferror (list_file))
	gc_error (1, errno, "can not read list file %s", list_filename);
    }

  list_option->active = 1;
  list_option->value = list;

  /* Fix up the read-only flag.  */
  config_option = find_option
    (component, gc_backend[backend].option_config_filename, GC_BACKEND_ANY);
  if (config_option->flags & GC_OPT_FLAG_NO_CHANGE)
    list_option->flags |= GC_OPT_FLAG_NO_CHANGE;

  if (list_file && gpgrt_fclose (list_file))
    gc_error (1, errno, "error closing %s", list_filename);
  xfree (line);
}


/* Retrieve the currently active options and their defaults from all
   involved backends for this component.  Using -1 for component will
   retrieve all options from all components. */
void
gc_component_retrieve_options (int component)
{
  int process_all = 0;
  int backend_seen[GC_BACKEND_NR];
  gc_backend_t backend;
  gc_option_t *option;

  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    backend_seen[backend] = 0;

  if (component == -1)
    {
      process_all = 1;
      component = 0;
      assert (component < GC_COMPONENT_NR);
    }

  do
    {
      if (component == GC_COMPONENT_PINENTRY)
        continue; /* Skip this dummy component.  */

      option = gc_component[component].options;

      while (option && option->name)
        {
          if (!(option->flags & GC_OPT_FLAG_GROUP))
            {
              backend = option->backend;

              if (backend_seen[backend])
                {
                  option++;
                  continue;
                }
              backend_seen[backend] = 1;

              assert (backend != GC_BACKEND_ANY);

              if (gc_backend[backend].program)
                retrieve_options_from_program (component, backend);
              else
                retrieve_options_from_file (component, backend);
            }
          option++;
        }
    }
  while (process_all && ++component < GC_COMPONENT_NR);

}



/* Perform a simple validity check based on the type.  Return in
 * NEW_VALUE_NR the value of the number in NEW_VALUE if OPTION is of
 * type GC_ARG_TYPE_NONE.  If VERBATIM is set the profile parsing mode
 * is used. */
static void
option_check_validity (gc_option_t *option, unsigned long flags,
		       char *new_value, unsigned long *new_value_nr,
                       int verbatim)
{
  char *arg;

  if (!option->active)
    gc_error (1, 0, "option %s not supported by backend %s",
              option->name, gc_backend[option->backend].name);

  if (option->new_flags || option->new_value)
    gc_error (1, 0, "option %s already changed", option->name);

  if (flags & GC_OPT_FLAG_DEFAULT)
    {
      if (*new_value)
	gc_error (1, 0, "argument %s provided for deleted option %s",
		  new_value, option->name);

      return;
    }

  /* GC_ARG_TYPE_NONE options have special list treatment.  */
  if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_NONE)
    {
      char *tail;

      gpg_err_set_errno (0);
      *new_value_nr = strtoul (new_value, &tail, 0);

      if (errno)
	gc_error (1, errno, "invalid argument for option %s",
		  option->name);
      if (*tail)
	gc_error (1, 0, "garbage after argument for option %s",
		      option->name);

      if (!(option->flags & GC_OPT_FLAG_LIST))
	{
	  if (*new_value_nr != 1)
	    gc_error (1, 0, "argument for non-list option %s of type 0 "
		      "(none) must be 1", option->name);
	}
      else
	{
	  if (*new_value_nr == 0)
	    gc_error (1, 0, "argument for option %s of type 0 (none) "
		      "must be positive", option->name);
	}

      return;
    }

  arg = new_value;
  do
    {
      if (*arg == '\0' || (*arg == ',' && !verbatim))
	{
	  if (!(option->flags & GC_OPT_FLAG_ARG_OPT))
	    gc_error (1, 0, "argument required for option %s", option->name);

	  if (*arg == ',' && !verbatim && !(option->flags & GC_OPT_FLAG_LIST))
	    gc_error (1, 0, "list found for non-list option %s", option->name);
	}
      else if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_STRING)
	{
	  if (*arg != '"' && !verbatim)
	    gc_error (1, 0, "string argument for option %s must begin "
		      "with a quote (\") character", option->name);

	  /* FIXME: We do not allow empty string arguments for now, as
	     we do not quote arguments in configuration files, and
	     thus no argument is indistinguishable from the empty
	     string.  */
	  if (arg[1] == '\0' || (arg[1] == ',' && !verbatim))
	    gc_error (1, 0, "empty string argument for option %s is "
		      "currently not allowed.  Please report this!",
		      option->name);
	}
      else if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_INT32)
	{
	  long res;

	  gpg_err_set_errno (0);
	  res = strtol (arg, &arg, 0);
	  (void) res;

	  if (errno)
	    gc_error (1, errno, "invalid argument for option %s",
		      option->name);

	  if (*arg != '\0' && (*arg != ',' || verbatim))
	    gc_error (1, 0, "garbage after argument for option %s",
		      option->name);
	}
      else if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_UINT32)
	{
	  unsigned long res;

	  gpg_err_set_errno (0);
	  res = strtoul (arg, &arg, 0);
	  (void) res;

	  if (errno)
	    gc_error (1, errno, "invalid argument for option %s",
		      option->name);

	  if (*arg != '\0' && (*arg != ',' || verbatim))
	    gc_error (1, 0, "garbage after argument for option %s",
		      option->name);
	}
      arg = verbatim? strchr (arg, ',') : NULL;
      if (arg)
	arg++;
    }
  while (arg && *arg);
}

#ifdef HAVE_W32_SYSTEM
int
copy_file (const char *src_name, const char *dst_name)
{
#define BUF_LEN 4096
  char buffer[BUF_LEN];
  int len;
  gpgrt_stream_t src;
  gpgrt_stream_t dst;

  src = gpgrt_fopen (src_name, "r");
  if (src == NULL)
    return -1;

  dst = gpgrt_fopen (dst_name, "w");
  if (dst == NULL)
    {
      int saved_err = errno;
      gpgrt_fclose (src);
      gpg_err_set_errno (saved_err);
      return -1;
    }

  do
    {
      int written;

      len = gpgrt_fread (buffer, 1, BUF_LEN, src);
      if (len == 0)
	break;
      written = gpgrt_fwrite (buffer, 1, len, dst);
      if (written != len)
	break;
    }
  while (! gpgrt_feof (src) && ! gpgrt_ferror (src) && ! gpgrt_ferror (dst));

  if (gpgrt_ferror (src) || gpgrt_ferror (dst) || ! gpgrt_feof (src))
    {
      int saved_errno = errno;
      gpgrt_fclose (src);
      gpgrt_fclose (dst);
      unlink (dst_name);
      gpg_err_set_errno (saved_errno);
      return -1;
    }

  if (gpgrt_fclose (dst))
    gc_error (1, errno, "error closing %s", dst_name);
  if (gpgrt_fclose (src))
    gc_error (1, errno, "error closing %s", src_name);

  return 0;
}
#endif /* HAVE_W32_SYSTEM */


/* Create and verify the new configuration file for the specified
 * backend and component.  Returns 0 on success and -1 on error.  This
 * function may store pointers to malloced strings in SRC_FILENAMEP,
 * DEST_FILENAMEP, and ORIG_FILENAMEP.  Those must be freed by the
 * caller.  The strings refer to three versions of the configuration
 * file:
 *
 * SRC_FILENAME:  The updated configuration is written to this file.
 * DEST_FILENAME: Name of the configuration file read by the
 *                component.
 * ORIG_FILENAME: A backup of the previous configuration file.
 *
 * To apply the configuration change, rename SRC_FILENAME to
 * DEST_FILENAME.  To revert to the previous configuration, rename
 * ORIG_FILENAME to DEST_FILENAME.  */
static int
change_options_file (gc_component_t component, gc_backend_t backend,
		     char **src_filenamep, char **dest_filenamep,
		     char **orig_filenamep)
{
  static const char marker[] = "###+++--- " GPGCONF_DISP_NAME " ---+++###";
  /* True if we are within the marker in the config file.  */
  int in_marker = 0;
  gc_option_t *option;
  char *line = NULL;
  size_t line_len;
  ssize_t length;
  int res;
  int fd;
  gpgrt_stream_t src_file = NULL;
  gpgrt_stream_t dest_file = NULL;
  char *src_filename;
  char *dest_filename;
  char *orig_filename;
  char *arg;
  char *cur_arg = NULL;

  option = find_option (component,
			gc_backend[backend].option_name, GC_BACKEND_ANY);
  assert (option);
  assert (option->active);
  assert (gc_arg_type[option->arg_type].fallback != GC_ARG_TYPE_NONE);

  /* FIXME.  Throughout the function, do better error reporting.  */
  /* Note that get_config_filename() calls percent_deescape(), so we
     call this before processing the arguments.  */
  dest_filename = xstrdup (get_config_filename (component, backend));
  src_filename = xasprintf ("%s.%s.%i.new",
                            dest_filename, GPGCONF_NAME, (int)getpid ());
  orig_filename = xasprintf ("%s.%s.%i.bak",
                             dest_filename, GPGCONF_NAME, (int)getpid ());

  arg = option->new_value;
  if (arg && arg[0] == '\0')
    arg = NULL;
  else if (arg)
    {
      char *end;

      arg++;
      end = strchr (arg, ',');
      if (end)
	*end = '\0';

      cur_arg = percent_deescape (arg);
      if (end)
	{
	  *end = ',';
	  arg = end + 1;
	}
      else
	arg = NULL;
    }

#ifdef HAVE_W32_SYSTEM
  res = copy_file (dest_filename, orig_filename);
#else
  res = link (dest_filename, orig_filename);
#endif
  if (res < 0 && errno != ENOENT)
    {
      xfree (dest_filename);
      xfree (src_filename);
      xfree (orig_filename);
      return -1;
    }
  if (res < 0)
    {
      xfree (orig_filename);
      orig_filename = NULL;
    }

  /* We now initialize the return strings, so the caller can do the
     cleanup for us.  */
  *src_filenamep = src_filename;
  *dest_filenamep = dest_filename;
  *orig_filenamep = orig_filename;

  /* Use open() so that we can use O_EXCL.  */
  fd = open (src_filename, O_CREAT | O_EXCL | O_WRONLY, 0644);
  if (fd < 0)
    return -1;
  src_file = gpgrt_fdopen (fd, "w");
  res = errno;
  if (!src_file)
    {
      gpg_err_set_errno (res);
      return -1;
    }

  /* Only if ORIG_FILENAME is not NULL did the configuration file
     exist already.  In this case, we will copy its content into the
     new configuration file, changing it to our liking in the
     process.  */
  if (orig_filename)
    {
      dest_file = gpgrt_fopen (dest_filename, "r");
      if (!dest_file)
	goto change_file_one_err;

      while ((length = gpgrt_read_line (dest_file, &line, &line_len, NULL)) > 0)
	{
	  int disable = 0;
	  char *start;

	  if (!strncmp (marker, line, sizeof (marker) - 1))
	    {
	      if (!in_marker)
		in_marker = 1;
	      else
		break;
	    }

	  start = line;
	  while (*start == ' ' || *start == '\t')
	    start++;
	  if (*start && *start != '\r' && *start != '\n' && *start != '#')
	    {
	      char *end;
	      char *endp;
	      char saved_end;

	      endp = start;
	      end = endp;

	      /* Search for the end of the line.  */
	      while (*endp && *endp != '#' && *endp != '\r' && *endp != '\n')
		{
		  endp++;
		  if (*endp && *endp != ' ' && *endp != '\t'
		      && *endp != '\r' && *endp != '\n' && *endp != '#')
		    end = endp + 1;
		}
	      saved_end = *end;
	      *end = '\0';

	      if ((option->new_flags & GC_OPT_FLAG_DEFAULT)
		  || !cur_arg || strcmp (start, cur_arg))
		disable = 1;
	      else
		{
		  /* Find next argument.  */
		  if (arg)
		    {
		      char *arg_end;

		      arg++;
		      arg_end = strchr (arg, ',');
		      if (arg_end)
			*arg_end = '\0';

		      cur_arg = percent_deescape (arg);
		      if (arg_end)
			{
			  *arg_end = ',';
			  arg = arg_end + 1;
			}
		      else
			arg = NULL;
		    }
		  else
		    cur_arg = NULL;
		}

	      *end = saved_end;
	    }

	  if (disable)
	    {
	      if (!in_marker)
		{
		  gpgrt_fprintf (src_file,
			   "# %s disabled this option here at %s\n",
			   GPGCONF_DISP_NAME, asctimestamp (gnupg_get_time ()));
		  if (gpgrt_ferror (src_file))
		    goto change_file_one_err;
		  gpgrt_fprintf (src_file, "# %s", line);
		  if (gpgrt_ferror (src_file))
		    goto change_file_one_err;
		}
	    }
	  else
	    {
	      gpgrt_fprintf (src_file, "%s", line);
	      if (gpgrt_ferror (src_file))
		goto change_file_one_err;
	    }
	}
      if (length < 0 || gpgrt_ferror (dest_file))
	goto change_file_one_err;
    }

  if (!in_marker)
    {
      /* There was no marker.  This is the first time we edit the
	 file.  We add our own marker at the end of the file and
	 proceed.  Note that we first write a newline, this guards us
	 against files which lack the newline at the end of the last
	 line, while it doesn't hurt us in all other cases.  */
      gpgrt_fprintf (src_file, "\n%s\n", marker);
      if (gpgrt_ferror (src_file))
	goto change_file_one_err;
    }

  /* At this point, we have copied everything up to the end marker
     into the new file, except for the arguments we are going to add.
     Now, dump the new arguments and write the end marker, possibly
     followed by the rest of the original file.  */
  while (cur_arg)
    {
      gpgrt_fprintf (src_file, "%s\n", cur_arg);

      /* Find next argument.  */
      if (arg)
	{
	  char *end;

	  arg++;
	  end = strchr (arg, ',');
	  if (end)
	    *end = '\0';

	  cur_arg = percent_deescape (arg);
	  if (end)
	    {
	      *end = ',';
	      arg = end + 1;
	    }
	  else
	    arg = NULL;
	}
      else
	cur_arg = NULL;
    }

  gpgrt_fprintf (src_file, "%s %s\n", marker, asctimestamp (gnupg_get_time ()));
  if (gpgrt_ferror (src_file))
    goto change_file_one_err;

  if (!in_marker)
    {
      gpgrt_fprintf (src_file, "# %s edited this configuration file.\n",
               GPGCONF_DISP_NAME);
      if (gpgrt_ferror (src_file))
	goto change_file_one_err;
      gpgrt_fprintf (src_file, "# It will disable options before this marked "
	       "block, but it will\n");
      if (gpgrt_ferror (src_file))
	goto change_file_one_err;
      gpgrt_fprintf (src_file, "# never change anything below these lines.\n");
      if (gpgrt_ferror (src_file))
	goto change_file_one_err;
    }
  if (dest_file)
    {
      while ((length = gpgrt_read_line (dest_file, &line, &line_len, NULL)) > 0)
	{
	  gpgrt_fprintf (src_file, "%s", line);
	  if (gpgrt_ferror (src_file))
	    goto change_file_one_err;
	}
      if (length < 0 || gpgrt_ferror (dest_file))
	goto change_file_one_err;
    }
  xfree (line);
  line = NULL;

  res = gpgrt_fclose (src_file);
  if (res)
    {
      res = errno;
      close (fd);
      if (dest_file)
	gpgrt_fclose (dest_file);
      gpg_err_set_errno (res);
      return -1;
    }
  close (fd);
  if (dest_file)
    {
      res = gpgrt_fclose (dest_file);
      if (res)
	return -1;
    }
  return 0;

 change_file_one_err:
  xfree (line);
  res = errno;
  if (src_file)
    {
      gpgrt_fclose (src_file);
      close (fd);
    }
  if (dest_file)
    gpgrt_fclose (dest_file);
  gpg_err_set_errno (res);
  return -1;
}


/* Create and verify the new configuration file for the specified
 * backend and component.  Returns 0 on success and -1 on error.  If
 * VERBATIM is set the profile mode is used.  This function may store
 * pointers to malloced strings in SRC_FILENAMEP, DEST_FILENAMEP, and
 * ORIG_FILENAMEP.  Those must be freed by the caller.  The strings
 * refer to three versions of the configuration file:
 *
 * SRC_FILENAME:  The updated configuration is written to this file.
 * DEST_FILENAME: Name of the configuration file read by the
 *                component.
 * ORIG_FILENAME: A backup of the previous configuration file.
 *
 * To apply the configuration change, rename SRC_FILENAME to
 * DEST_FILENAME.  To revert to the previous configuration, rename
 * ORIG_FILENAME to DEST_FILENAME.  */
static int
change_options_program (gc_component_t component, gc_backend_t backend,
			char **src_filenamep, char **dest_filenamep,
			char **orig_filenamep,
                        int verbatim)
{
  static const char marker[] = "###+++--- " GPGCONF_DISP_NAME " ---+++###";
  /* True if we are within the marker in the config file.  */
  int in_marker = 0;
  gc_option_t *option;
  char *line = NULL;
  size_t line_len;
  ssize_t length;
  int res;
  int fd;
  gpgrt_stream_t src_file = NULL;
  gpgrt_stream_t dest_file = NULL;
  char *src_filename;
  char *dest_filename;
  char *orig_filename;
  /* Special hack for gpg, see below.  */
  int utf8strings_seen = 0;

  /* FIXME.  Throughout the function, do better error reporting.  */
  dest_filename = xstrdup (get_config_filename (component, backend));
  src_filename = xasprintf ("%s.%s.%i.new",
                            dest_filename, GPGCONF_NAME, (int)getpid ());
  orig_filename = xasprintf ("%s.%s.%i.bak",
                             dest_filename, GPGCONF_NAME, (int)getpid ());

#ifdef HAVE_W32_SYSTEM
  res = copy_file (dest_filename, orig_filename);
#else
  res = link (dest_filename, orig_filename);
#endif
  if (res < 0 && errno != ENOENT)
    {
      xfree (dest_filename);
      xfree (src_filename);
      xfree (orig_filename);
      return -1;
    }
  if (res < 0)
    {
      xfree (orig_filename);
      orig_filename = NULL;
    }

  /* We now initialize the return strings, so the caller can do the
     cleanup for us.  */
  *src_filenamep = src_filename;
  *dest_filenamep = dest_filename;
  *orig_filenamep = orig_filename;

  /* Use open() so that we can use O_EXCL.  */
  fd = open (src_filename, O_CREAT | O_EXCL | O_WRONLY, 0644);
  if (fd < 0)
    return -1;
  src_file = gpgrt_fdopen (fd, "w");
  res = errno;
  if (!src_file)
    {
      gpg_err_set_errno (res);
      return -1;
    }

  /* Only if ORIG_FILENAME is not NULL did the configuration file
     exist already.  In this case, we will copy its content into the
     new configuration file, changing it to our liking in the
     process.  */
  if (orig_filename)
    {
      dest_file = gpgrt_fopen (dest_filename, "r");
      if (!dest_file)
	goto change_one_err;

      while ((length = gpgrt_read_line (dest_file, &line, &line_len, NULL)) > 0)
	{
	  int disable = 0;
	  char *start;

	  if (!strncmp (marker, line, sizeof (marker) - 1))
	    {
	      if (!in_marker)
		in_marker = 1;
	      else
		break;
	    }
	  else if (backend == GC_BACKEND_GPG && in_marker
		   && ! strcmp ("utf8-strings\n", line))
	    {
	      /* Strip duplicated entries.  */
	      if (utf8strings_seen)
		disable = 1;
	      else
		utf8strings_seen = 1;
	    }

	  start = line;
	  while (*start == ' ' || *start == '\t')
	    start++;
	  if (*start && *start != '\r' && *start != '\n' && *start != '#')
	    {
	      char *end;
	      char saved_end;

	      end = start;
	      while (*end && *end != ' ' && *end != '\t'
		     && *end != '\r' && *end != '\n' && *end != '#')
		end++;
	      saved_end = *end;
	      *end = '\0';

	      option = find_option (component, start, backend);
	      *end = saved_end;
	      if (option && ((option->new_flags & GC_OPT_FLAG_DEFAULT)
			     || option->new_value))
		disable = 1;
	    }
	  if (disable)
	    {
	      if (!in_marker)
		{
		  gpgrt_fprintf (src_file,
			   "# %s disabled this option here at %s\n",
			   GPGCONF_DISP_NAME, asctimestamp (gnupg_get_time ()));
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;
		  gpgrt_fprintf (src_file, "# %s", line);
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;
		}
	    }
	  else
	    {
	      gpgrt_fprintf (src_file, "%s", line);
	      if (gpgrt_ferror (src_file))
		goto change_one_err;
	    }
	}
      if (length < 0 || gpgrt_ferror (dest_file))
	goto change_one_err;
    }

  if (!in_marker)
    {
      /* There was no marker.  This is the first time we edit the
	 file.  We add our own marker at the end of the file and
	 proceed.  Note that we first write a newline, this guards us
	 against files which lack the newline at the end of the last
	 line, while it doesn't hurt us in all other cases.  */
      gpgrt_fprintf (src_file, "\n%s\n", marker);
      if (gpgrt_ferror (src_file))
	goto change_one_err;
    }
  /* At this point, we have copied everything up to the end marker
     into the new file, except for the options we are going to change.
     Now, dump the changed options (except for those we are going to
     revert to their default), and write the end marker, possibly
     followed by the rest of the original file.  */

  /* We have to turn on UTF8 strings for GnuPG.  */
  if (backend == GC_BACKEND_GPG && ! utf8strings_seen)
    gpgrt_fprintf (src_file, "utf8-strings\n");

  option = gc_component[component].options;
  while (option->name)
    {
      if (!(option->flags & GC_OPT_FLAG_GROUP)
	  && option->backend == backend
	  && option->new_value)
	{
	  char *arg = option->new_value;

	  do
	    {
	      if (*arg == '\0' || *arg == ',')
		{
		  gpgrt_fprintf (src_file, "%s\n", option->name);
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;
		}
	      else if (gc_arg_type[option->arg_type].fallback
		       == GC_ARG_TYPE_NONE)
		{
		  assert (*arg == '1');
		  gpgrt_fprintf (src_file, "%s\n", option->name);
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;

		  arg++;
		}
	      else if (gc_arg_type[option->arg_type].fallback
		       == GC_ARG_TYPE_STRING)
		{
		  char *end;

                  if (!verbatim)
                    {
                      log_assert (*arg == '"');
                      arg++;

                      end = strchr (arg, ',');
                      if (end)
                        *end = '\0';
                    }
                  else
                    end = NULL;

		  gpgrt_fprintf (src_file, "%s %s\n", option->name,
			   verbatim? arg : percent_deescape (arg));
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;

		  if (end)
		    *end = ',';
		  arg = end;
		}
	      else
		{
		  char *end;

		  end = strchr (arg, ',');
		  if (end)
		    *end = '\0';

		  gpgrt_fprintf (src_file, "%s %s\n", option->name, arg);
		  if (gpgrt_ferror (src_file))
		    goto change_one_err;

		  if (end)
		    *end = ',';
		  arg = end;
		}

	      assert (arg == NULL || *arg == '\0' || *arg == ',');
	      if (arg && *arg == ',')
		arg++;
	    }
	  while (arg && *arg);
	}
      option++;
    }

  gpgrt_fprintf (src_file, "%s %s\n", marker, asctimestamp (gnupg_get_time ()));
  if (gpgrt_ferror (src_file))
    goto change_one_err;

  if (!in_marker)
    {
      gpgrt_fprintf (src_file, "# %s edited this configuration file.\n",
               GPGCONF_DISP_NAME);
      if (gpgrt_ferror (src_file))
	goto change_one_err;
      gpgrt_fprintf (src_file, "# It will disable options before this marked "
	       "block, but it will\n");
      if (gpgrt_ferror (src_file))
	goto change_one_err;
      gpgrt_fprintf (src_file, "# never change anything below these lines.\n");
      if (gpgrt_ferror (src_file))
	goto change_one_err;
    }
  if (dest_file)
    {
      while ((length = gpgrt_read_line (dest_file, &line, &line_len, NULL)) > 0)
	{
	  gpgrt_fprintf (src_file, "%s", line);
	  if (gpgrt_ferror (src_file))
	    goto change_one_err;
	}
      if (length < 0 || gpgrt_ferror (dest_file))
	goto change_one_err;
    }
  xfree (line);
  line = NULL;

  res = gpgrt_fclose (src_file);
  if (res)
    {
      res = errno;
      close (fd);
      if (dest_file)
	gpgrt_fclose (dest_file);
      gpg_err_set_errno (res);
      return -1;
    }
  close (fd);
  if (dest_file)
    {
      res = gpgrt_fclose (dest_file);
      if (res)
	return -1;
    }
  return 0;

 change_one_err:
  xfree (line);
  res = errno;
  if (src_file)
    {
      gpgrt_fclose (src_file);
      close (fd);
    }
  if (dest_file)
    gpgrt_fclose (dest_file);
  gpg_err_set_errno (res);
  return -1;
}


/* Common code for gc_component_change_options and
 * gc_process_gpgconf_conf.  If VERBATIM is set the profile parsing
 * mode is used.  */
static void
change_one_value (gc_option_t *option, int *runtime,
                  unsigned long flags, char *new_value, int verbatim)
{
  unsigned long new_value_nr = 0;

  option_check_validity (option, flags, new_value, &new_value_nr, verbatim);

  if (option->flags & GC_OPT_FLAG_RUNTIME)
    runtime[option->backend] = 1;

  option->new_flags = flags;
  if (!(flags & GC_OPT_FLAG_DEFAULT))
    {
      if (gc_arg_type[option->arg_type].fallback == GC_ARG_TYPE_NONE
          && (option->flags & GC_OPT_FLAG_LIST))
        {
          char *str;

          /* We convert the number to a list of 1's for convenient
             list handling.  */
          assert (new_value_nr > 0);
          option->new_value = xmalloc ((2 * (new_value_nr - 1) + 1) + 1);
          str = option->new_value;
          *(str++) = '1';
          while (--new_value_nr > 0)
            {
              *(str++) = ',';
              *(str++) = '1';
            }
          *(str++) = '\0';
        }
      else
        option->new_value = xstrdup (new_value);
    }
}


/* Read the modifications from IN and apply them.  If IN is NULL the
   modifications are expected to already have been set to the global
   table.  If VERBATIM is set the profile mode is used.  */
void
gc_component_change_options (int component, estream_t in, estream_t out,
                             int verbatim)
{
  int err = 0;
  int block = 0;
  int runtime[GC_BACKEND_NR];
  char *src_filename[GC_BACKEND_NR];
  char *dest_filename[GC_BACKEND_NR];
  char *orig_filename[GC_BACKEND_NR];
  gc_backend_t backend;
  gc_option_t *option;
  char *line = NULL;
  size_t line_len = 0;
  ssize_t length;

  if (component == GC_COMPONENT_PINENTRY)
    return; /* Dummy component for now.  */

  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    {
      runtime[backend] = 0;
      src_filename[backend] = NULL;
      dest_filename[backend] = NULL;
      orig_filename[backend] = NULL;
    }

  if (in)
    {
      /* Read options from the file IN.  */
      while ((length = es_read_line (in, &line, &line_len, NULL)) > 0)
        {
          char *linep;
          unsigned long flags = 0;
          char *new_value = "";

          /* Strip newline and carriage return, if present.  */
          while (length > 0
                 && (line[length - 1] == '\n' || line[length - 1] == '\r'))
            line[--length] = '\0';

          linep = strchr (line, ':');
          if (linep)
            *(linep++) = '\0';

          /* Extract additional flags.  Default to none.  */
          if (linep)
            {
              char *end;
              char *tail;

              end = strchr (linep, ':');
              if (end)
                *(end++) = '\0';

              gpg_err_set_errno (0);
              flags = strtoul (linep, &tail, 0);
              if (errno)
                gc_error (1, errno, "malformed flags in option %s", line);
              if (!(*tail == '\0' || *tail == ':' || *tail == ' '))
                gc_error (1, 0, "garbage after flags in option %s", line);

              linep = end;
            }

          /* Don't allow setting of the no change flag.  */
          flags &= ~GC_OPT_FLAG_NO_CHANGE;

          /* Extract default value, if present.  Default to empty if not.  */
          if (linep)
            {
              char *end;
              end = strchr (linep, ':');
              if (end)
                *(end++) = '\0';
              new_value = linep;
              linep = end;
            }

          option = find_option (component, line, GC_BACKEND_ANY);
          if (!option)
            gc_error (1, 0, "unknown option %s", line);

          if ((option->flags & GC_OPT_FLAG_NO_CHANGE))
            {
              gc_error (0, 0, "ignoring new value for option %s",
                        option->name);
              continue;
            }

          change_one_value (option, runtime, flags, new_value, 0);
        }
      if (length < 0 || gpgrt_ferror (in))
	gc_error (1, errno, "error reading stream 'in'");
    }

  /* Now that we have collected and locally verified the changes,
     write them out to new configuration files, verify them
     externally, and then commit them.  */
  option = gc_component[component].options;
  while (option && option->name)
    {
      /* Go on if we have already seen this backend, or if there is
	 nothing to do.  */
      if (src_filename[option->backend]
	  || !(option->new_flags || option->new_value))
	{
	  option++;
	  continue;
	}

      if (gc_backend[option->backend].program)
	{
	  err = change_options_program (component, option->backend,
					&src_filename[option->backend],
					&dest_filename[option->backend],
					&orig_filename[option->backend],
                                        verbatim);
	  if (! err)
	    {
	      /* External verification.  */
	      err = gc_component_check_options (component, out,
						src_filename[option->backend]);
	      if (err)
		{
		  gc_error (0, 0,
			    _("External verification of component %s failed"),
			    gc_component[component].name);
		  gpg_err_set_errno (EINVAL);
		}
	    }

	}
      else
	err = change_options_file (component, option->backend,
				   &src_filename[option->backend],
				   &dest_filename[option->backend],
				   &orig_filename[option->backend]);

      if (err)
	break;

      option++;
    }

  /* We are trying to atomically commit all changes.  Unfortunately,
     we cannot rely on gnupg_rename_file to manage the signals for us,
     doing so would require us to pass NULL as BLOCK to any subsequent
     call to it.  Instead, we just manage the signal handling
     manually.  */
  block = 1;
  gnupg_block_all_signals ();

  if (! err && ! opt.dry_run)
    {
      int i;

      for (i = 0; i < GC_BACKEND_NR; i++)
	{
	  if (src_filename[i])
	    {
	      /* FIXME: Make a verification here.  */

	      assert (dest_filename[i]);

	      if (orig_filename[i])
		err = gnupg_rename_file (src_filename[i], dest_filename[i], NULL);
	      else
		{
#ifdef HAVE_W32_SYSTEM
		  /* We skip the unlink if we expect the file not to
		     be there.  */
                  err = gnupg_rename_file (src_filename[i], dest_filename[i], NULL);
#else /* HAVE_W32_SYSTEM */
		  /* This is a bit safer than rename() because we
		     expect DEST_FILENAME not to be there.  If it
		     happens to be there, this will fail.  */
		  err = link (src_filename[i], dest_filename[i]);
		  if (!err)
		    err = unlink (src_filename[i]);
#endif /* !HAVE_W32_SYSTEM */
		}
	      if (err)
		break;
	      xfree (src_filename[i]);
	      src_filename[i] = NULL;
	    }
	}
    }

  if (err || opt.dry_run)
    {
      int i;
      int saved_errno = errno;

      /* An error occurred or a dry-run is requested.  */
      for (i = 0; i < GC_BACKEND_NR; i++)
	{
	  if (src_filename[i])
	    {
	      /* The change was not yet committed.  */
	      unlink (src_filename[i]);
	      if (orig_filename[i])
		unlink (orig_filename[i]);
	    }
	  else
	    {
	      /* The changes were already committed.  FIXME: This is a
		 tad dangerous, as we don't know if we don't overwrite
		 a version of the file that is even newer than the one
		 we just installed.  */
	      if (orig_filename[i])
		gnupg_rename_file (orig_filename[i], dest_filename[i], NULL);
	      else
		unlink (dest_filename[i]);
	    }
	}
      if (err)
	gc_error (1, saved_errno, "could not commit changes");

      /* Fall-through for dry run.  */
      goto leave;
    }

  /* If it all worked, notify the daemons of the changes.  */
  if (opt.runtime)
    for (backend = 0; backend < GC_BACKEND_NR; backend++)
      {
	if (runtime[backend] && gc_backend[backend].runtime_change)
	  (*gc_backend[backend].runtime_change) (0);
      }

  /* Move the per-process backup file into its place.  */
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    if (orig_filename[backend])
      {
	char *backup_filename;

	assert (dest_filename[backend]);

	backup_filename = xasprintf ("%s.%s.bak",
                                     dest_filename[backend], GPGCONF_NAME);
	gnupg_rename_file (orig_filename[backend], backup_filename, NULL);
	xfree (backup_filename);
      }

 leave:
  if (block)
    gnupg_unblock_all_signals ();
  xfree (line);
  for (backend = 0; backend < GC_BACKEND_NR; backend++)
    {
      xfree (src_filename[backend]);
      xfree (dest_filename[backend]);
      xfree (orig_filename[backend]);
    }
}


/* Check whether USER matches the current user of one of its group.
   This function may change USER.  Returns true is there is a
   match.  */
static int
key_matches_user_or_group (char *user)
{
  char *group;

  if (*user == '*' && user[1] == 0)
    return 1; /* A single asterisk matches all users.  */

  group = strchr (user, ':');
  if (group)
    *group++ = 0;

#ifdef HAVE_W32_SYSTEM
  /* Under Windows we don't support groups. */
  if (group && *group)
    gc_error (0, 0, _("Note that group specifications are ignored\n"));
#ifndef HAVE_W32CE_SYSTEM
  if (*user)
    {
      static char *my_name;

      if (!my_name)
        {
          char tmp[1];
          DWORD size = 1;

          GetUserNameA (tmp, &size);
          my_name = xmalloc (size);
          if (!GetUserNameA (my_name, &size))
            gc_error (1,0, "error getting current user name: %s",
                      w32_strerror (-1));
        }

      if (!strcmp (user, my_name))
        return 1; /* Found.  */
    }
#endif /*HAVE_W32CE_SYSTEM*/
#else /*!HAVE_W32_SYSTEM*/
  /* First check whether the user matches.  */
  if (*user)
    {
      static char *my_name;

      if (!my_name)
        {
          struct passwd *pw = getpwuid ( getuid () );
          if (!pw)
            gc_error (1, errno, "getpwuid failed for current user");
          my_name = xstrdup (pw->pw_name);
        }
      if (!strcmp (user, my_name))
        return 1; /* Found.  */
    }

  /* If that failed, check whether a group matches.  */
  if (group && *group)
    {
      static char *my_group;
      static char **my_supgroups;
      int n;

      if (!my_group)
        {
          struct group *gr = getgrgid ( getgid () );
          if (!gr)
            gc_error (1, errno, "getgrgid failed for current user");
          my_group = xstrdup (gr->gr_name);
        }
      if (!strcmp (group, my_group))
        return 1; /* Found.  */

      if (!my_supgroups)
        {
          int ngids;
          gid_t *gids;

          ngids = getgroups (0, NULL);
          gids  = xcalloc (ngids+1, sizeof *gids);
          ngids = getgroups (ngids, gids);
          if (ngids < 0)
            gc_error (1, errno, "getgroups failed for current user");
          my_supgroups = xcalloc (ngids+1, sizeof *my_supgroups);
          for (n=0; n < ngids; n++)
            {
              struct group *gr = getgrgid ( gids[n] );
              if (!gr)
                gc_error (1, errno, "getgrgid failed for supplementary group");
              my_supgroups[n] = xstrdup (gr->gr_name);
            }
          xfree (gids);
        }

      for (n=0; my_supgroups[n]; n++)
        if (!strcmp (group, my_supgroups[n]))
          return 1; /* Found.  */
    }
#endif /*!HAVE_W32_SYSTEM*/
  return 0; /* No match.  */
}



/* Read and process the global configuration file for gpgconf.  This
   optional file is used to update our internal tables at runtime and
   may also be used to set new default values.  If FNAME is NULL the
   default name will be used.  With UPDATE set to true the internal
   tables are actually updated; if not set, only a syntax check is
   done.  If DEFAULTS is true the global options are written to the
   configuration files.  If LISTFP is set, no changes are done but the
   configuration file is printed to LISTFP in a colon separated format.

   Returns 0 on success or if the config file is not present; -1 is
   returned on error. */
int
gc_process_gpgconf_conf (const char *fname_arg, int update, int defaults,
                         estream_t listfp)
{
  int result = 0;
  char *line = NULL;
  size_t line_len = 0;
  ssize_t length;
  gpgrt_stream_t config;
  int lineno = 0;
  int in_rule = 0;
  int got_match = 0;
  int runtime[GC_BACKEND_NR];
  int backend_id, component_id;
  char *fname;

  if (fname_arg)
    fname = xstrdup (fname_arg);
  else
    fname = make_filename (gnupg_sysconfdir (), GPGCONF_NAME EXTSEP_S "conf",
                           NULL);

  for (backend_id = 0; backend_id < GC_BACKEND_NR; backend_id++)
    runtime[backend_id] = 0;

  config = gpgrt_fopen (fname, "r");
  if (!config)
    {
      /* Do not print an error if the file is not available, except
         when running in syntax check mode.  */
      if (errno != ENOENT || !update)
        {
          gc_error (0, errno, "can not open global config file '%s'", fname);
          result = -1;
        }
      xfree (fname);
      return result;
    }

  while ((length = gpgrt_read_line (config, &line, &line_len, NULL)) > 0)
    {
      char *key, *component, *option, *flags, *value;
      char *empty;
      gc_option_t *option_info = NULL;
      char *p;
      int is_continuation;

      lineno++;
      key = line;
      while (*key == ' ' || *key == '\t')
        key++;
      if (!*key || *key == '#' || *key == '\r' || *key == '\n')
        continue;

      is_continuation = (key != line);

      /* Parse the key field.  */
      if (!is_continuation && got_match)
        break;  /* Finish after the first match.  */
      else if (!is_continuation)
        {
          in_rule = 0;
          for (p=key+1; *p && !strchr (" \t\r\n", *p); p++)
            ;
          if (!*p)
            {
              gc_error (0, 0, "missing rule at '%s', line %d", fname, lineno);
              result = -1;
              continue;
            }
          *p++ = 0;
          component = p;
        }
      else if (!in_rule)
        {
          gc_error (0, 0, "continuation but no rule at '%s', line %d",
                    fname, lineno);
          result = -1;
          continue;
        }
      else
        {
          component = key;
          key = NULL;
        }

      in_rule = 1;

      /* Parse the component.  */
      while (*component == ' ' || *component == '\t')
        component++;
      for (p=component; *p && !strchr (" \t\r\n", *p); p++)
        ;
      if (p == component)
        {
          gc_error (0, 0, "missing component at '%s', line %d",
                    fname, lineno);
          result = -1;
          continue;
        }
      empty = p;
      *p++ = 0;
      option = p;
      component_id = gc_component_find (component);
      if (component_id < 0)
        {
          gc_error (0, 0, "unknown component at '%s', line %d",
                    fname, lineno);
          result = -1;
        }

      /* Parse the option name.  */
      while (*option == ' ' || *option == '\t')
        option++;
      for (p=option; *p && !strchr (" \t\r\n", *p); p++)
        ;
      if (p == option)
        {
          gc_error (0, 0, "missing option at '%s', line %d",
                    fname, lineno);
          result = -1;
          continue;
        }
      *p++ = 0;
      flags = p;
      if ( component_id != -1)
        {
          option_info = find_option (component_id, option, GC_BACKEND_ANY);
          if (!option_info)
            {
              gc_error (0, 0, "unknown option at '%s', line %d",
                        fname, lineno);
              result = -1;
            }
        }


      /* Parse the optional flags.  */
      while (*flags == ' ' || *flags == '\t')
        flags++;
      if (*flags == '[')
        {
          flags++;
          p = strchr (flags, ']');
          if (!p)
            {
              gc_error (0, 0, "syntax error in rule at '%s', line %d",
                        fname, lineno);
              result = -1;
              continue;
            }
          *p++ = 0;
          value = p;
        }
      else  /* No flags given.  */
        {
          value = flags;
          flags = NULL;
        }

      /* Parse the optional value.  */
      while (*value == ' ' || *value == '\t')
       value++;
      for (p=value; *p && !strchr ("\r\n", *p); p++)
        ;
      if (p == value)
        value = empty; /* No value given; let it point to an empty string.  */
      else
        {
          /* Strip trailing white space.  */
          *p = 0;
          for (p--; p > value && (*p == ' ' || *p == '\t'); p--)
            *p = 0;
        }

      /* Check flag combinations.  */
      if (!flags)
        ;
      else if (!strcmp (flags, "default"))
        {
          if (*value)
            {
              gc_error (0, 0, "flag \"default\" may not be combined "
                        "with a value at '%s', line %d",
                        fname, lineno);
              result = -1;
            }
        }
      else if (!strcmp (flags, "change"))
        ;
      else if (!strcmp (flags, "no-change"))
        ;
      else
        {
          gc_error (0, 0, "unknown flag at '%s', line %d",
                    fname, lineno);
          result = -1;
        }

      /* In list mode we print out all records.  */
      if (listfp && !result)
        {
          /* If this is a new ruleset, print a key record.  */
          if (!is_continuation)
            {
              char *group = strchr (key, ':');
              if (group)
                {
                  *group++ = 0;
                  if ((p = strchr (group, ':')))
                    *p = 0; /* We better strip any extra stuff. */
                }

              es_fprintf (listfp, "k:%s:", gc_percent_escape (key));
              es_fprintf (listfp, "%s\n", group? gc_percent_escape (group):"");
            }

          /* All other lines are rule records.  */
          es_fprintf (listfp, "r:::%s:%s:%s:",
                      gc_component[component_id].name,
                      option_info->name? option_info->name : "",
                      flags? flags : "");
          if (value != empty)
            es_fprintf (listfp, "\"%s", gc_percent_escape (value));

          es_putc ('\n', listfp);
        }

      /* Check whether the key matches but do this only if we are not
         running in syntax check mode. */
      if ( update
           && !result && !listfp
           && (got_match || (key && key_matches_user_or_group (key))) )
        {
          int newflags = 0;

          got_match = 1;

          /* Apply the flags from gpgconf.conf.  */
          if (!flags)
            ;
          else if (!strcmp (flags, "default"))
            newflags |= GC_OPT_FLAG_DEFAULT;
          else if (!strcmp (flags, "no-change"))
            option_info->flags |= GC_OPT_FLAG_NO_CHANGE;
          else if (!strcmp (flags, "change"))
            option_info->flags &= ~GC_OPT_FLAG_NO_CHANGE;

          if (defaults)
            {
              /* Here we explicitly allow updating the value again.  */
              if (newflags)
                {
                  option_info->new_flags = 0;
                }
              if (*value)
                {
                  xfree (option_info->new_value);
                  option_info->new_value = NULL;
                }
              change_one_value (option_info, runtime, newflags, value, 0);
            }
        }
    }

  if (length < 0 || gpgrt_ferror (config))
    {
      gc_error (0, errno, "error reading from '%s'", fname);
      result = -1;
    }
  if (gpgrt_fclose (config))
    gc_error (0, errno, "error closing '%s'", fname);

  xfree (line);

  /* If it all worked, process the options. */
  if (!result && update && defaults && !listfp)
    {
      /* We need to switch off the runtime update, so that we can do
         it later all at once. */
      int save_opt_runtime = opt.runtime;
      opt.runtime = 0;

      for (component_id = 0; component_id < GC_COMPONENT_NR; component_id++)
        {
          gc_component_change_options (component_id, NULL, NULL, 0);
        }
      opt.runtime = save_opt_runtime;

      if (opt.runtime)
        {
          for (backend_id = 0; backend_id < GC_BACKEND_NR; backend_id++)
            if (runtime[backend_id] && gc_backend[backend_id].runtime_change)
              (*gc_backend[backend_id].runtime_change) (0);
        }
    }

  xfree (fname);
  return result;
}


/*
 * Apply the profile FNAME to all known configure files.
 */
gpg_error_t
gc_apply_profile (const char *fname)
{
  gpg_error_t err;
  char *fname_buffer = NULL;
  char *line = NULL;
  size_t line_len = 0;
  ssize_t length;
  estream_t fp;
  int lineno = 0;
  int runtime[GC_BACKEND_NR];
  int backend_id;
  int component_id = -1;
  int skip_section = 0;
  int error_count = 0;
  int newflags;

  if (!fname)
    fname = "-";

  for (backend_id = 0; backend_id < GC_BACKEND_NR; backend_id++)
    runtime[backend_id] = 0;


  if (!(!strcmp (fname, "-")
        || strchr (fname, '/')
#ifdef HAVE_W32_SYSTEM
        || strchr (fname, '\\')
#endif
        || strchr (fname, '.')))
    {
      /* FNAME looks like a standard profile name.  Check whether one
       * is installed and use that instead of the given file name.  */
      fname_buffer = xstrconcat (gnupg_datadir (), DIRSEP_S,
                                 fname, ".prf", NULL);
      if (!access (fname_buffer, F_OK))
        fname = fname_buffer;
    }

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

  if (opt.verbose)
    log_info ("applying profile '%s'\n", fname);

  err = 0;
  while ((length = es_read_line (fp, &line, &line_len, NULL)) > 0)
    {
      char *name, *flags, *value;
      gc_option_t *option_info = NULL;
      char *p;

      lineno++;
      name = line;
      while (*name == ' ' || *name == '\t')
        name++;
      if (!*name || *name == '#' || *name == '\r' || *name == '\n')
        continue;
      trim_trailing_spaces (name);

      /* Check whether this is a new section.  */
      if (*name == '[')
        {
          name++;
          skip_section = 0;
          /* New section: Get the name of the component.  */
          p = strchr (name, ']');
          if (!p)
            {
              error_count++;
              log_info ("%s:%d:%d: error: syntax error in section tag\n",
                        fname, lineno, (int)(name - line));
              skip_section = 1;
              continue;
            }
          *p++ = 0;
          if (*p)
            log_info ("%s:%d:%d: warning: garbage after section tag\n",
                      fname, lineno, (int)(p - line));

          trim_spaces (name);
          component_id = gc_component_find (name);
          if (component_id < 0)
            {
              log_info ("%s:%d:%d: warning: skipping unknown section '%s'\n",
                        fname, lineno, (int)(name - line), name );
              skip_section = 1;
            }
          continue;
        }

      if (skip_section)
        continue;
      if (component_id < 0)
        {
          error_count++;
          log_info ("%s:%d:%d: error: not in a valid section\n",
                    fname, lineno, (int)(name - line));
          skip_section = 1;
          continue;
        }

      /* Parse the option name.  */
      for (p = name; *p && !spacep (p); p++)
        ;
      *p++ = 0;
      value = p;

      option_info = find_option (component_id, name, GC_BACKEND_ANY);
      if (!option_info)
        {
          error_count++;
          log_info ("%s:%d:%d: error: unknown option '%s' in section '%s'\n",
                    fname, lineno, (int)(name - line),
                    name, gc_component[component_id].name);
          continue;
        }

      /* Parse the optional flags. */
      trim_spaces (value);
      flags = value;
      if (*flags == '[')
        {
          flags++;
          p = strchr (flags, ']');
          if (!p)
            {
              log_info ("%s:%d:%d: warning: invalid flag specification\n",
                        fname, lineno, (int)(p - line));
              continue;
            }
          *p++ = 0;
          value = p;
          trim_spaces (value);
        }
      else /* No flags given.  */
        flags = NULL;

      /* Set required defaults.  */
      if (gc_arg_type[option_info->arg_type].fallback == GC_ARG_TYPE_NONE
          && !*value)
        value = "1";

      /* Check and save this option.  */
      newflags = 0;
      if (flags && !strcmp (flags, "default"))
        newflags |= GC_OPT_FLAG_DEFAULT;

      if (newflags)
        option_info->new_flags = 0;
      if (*value)
        {
          xfree (option_info->new_value);
          option_info->new_value = NULL;
        }
      change_one_value (option_info, runtime, newflags, value, 1);
    }

  if (length < 0 || es_ferror (fp))
    {
      err = gpg_error_from_syserror ();
      error_count++;
      log_error (_("%s:%u: read error: %s\n"),
                 fname, lineno, gpg_strerror (err));
    }
  if (es_fclose (fp))
    log_error (_("error closing '%s'\n"), fname);
  if (error_count)
    log_error (_("error parsing '%s'\n"), fname);

  xfree (line);

  /* If it all worked, process the options. */
  if (!err)
    {
      /* We need to switch off the runtime update, so that we can do
         it later all at once. */
      int save_opt_runtime = opt.runtime;
      opt.runtime = 0;

      for (component_id = 0; component_id < GC_COMPONENT_NR; component_id++)
        {
          gc_component_change_options (component_id, NULL, NULL, 1);
        }
      opt.runtime = save_opt_runtime;

      if (opt.runtime)
        {
          for (backend_id = 0; backend_id < GC_BACKEND_NR; backend_id++)
            if (runtime[backend_id] && gc_backend[backend_id].runtime_change)
              (*gc_backend[backend_id].runtime_change) (0);
        }
    }

  xfree (fname_buffer);
  return err;
}