dirmngr: New command AD_QUERY.

* dirmngr/dirmngr.h: Include name-value.h
(struct server_control_s): Add rootdse and rootdse_tried.
* dirmngr/dirmngr.c (dirmngr_deinit_default_ctrl): Release them.
* dirmngr/ks-engine.h (KS_GET_FLAG_ROOTDSE): Add two new flags.
* dirmngr/ks-engine-ldap.c: Include ks-action.h
(SERVERINFO_GENERIC): New.
(struct ks_engine_ldap_local_s): Add scope.
(ks_ldap_new_state): Set a default scope.
(ks_ldap_clear_state): Ditto.
(my_ldap_connect): Add flag generic.
(return_all_attributes): New.
(fetch_rootdse): New.
(basedn_from_rootdse): New.
(ks_ldap_get): Move some code out to ...
(ks_ldap_prepare_my_state): New.
(ks_ldap_query): New.
* dirmngr/ks-action.c (ks_action_parse_uri): Factored out from server.c
(ks_action_query): New.
* dirmngr/server.c (make_keyserver_item): Factored most code out to
ks_action_parse_uri.
(cmd_ad_query): New.

* dirmngr/ks-engine-ldap.c (no_ldap_due_to_tor): New common error
printing.  Now also with status line.
--

This command allows to query the Windows Active directory.

(cherry picked from commit 625aeb65b0)

no_ldap_due_to_tor has been backported from 2.4

dirmngr/ks-engine.h

@@ -27,6 +27,8 @@
 #define KS_GET_FLAG_ONLY_LDAP 1
 #define KS_GET_FLAG_FIRST     2
 #define KS_GET_FLAG_NEXT      4
+#define KS_GET_FLAG_ONLY_AD   8  /* Do this only if we have an AD.  */
+#define KS_GET_FLAG_ROOTDSE  16  /* Get the rootDSE.  */
 
 
 /*-- ks-action.c --*/
@@ -78,6 +80,9 @@ gpg_error_t ks_ldap_get (ctrl_t ctrl, parsed_uri_t uri,
 gpg_error_t ks_ldap_put (ctrl_t ctrl, parsed_uri_t uri,
 			 void *data, size_t datalen,
 			 void *info, size_t infolen);
+gpg_error_t ks_ldap_query (ctrl_t ctrl, parsed_uri_t uri,
+                           unsigned int ks_get_flags,
+                           const char *filter, char **attrs, estream_t *r_fp);
 
 
 #endif /*DIRMNGR_KS_ENGINE_H*/