dirmngr: Support paged LDAP mode for KS_GET

* dirmngr/ks-engine-ldap.c (PAGE_SIZE): New.
(struct ks_engine_ldap_local_s): Add several new fields.
(ks_ldap_clear_state): Release them.
(search_and_parse): Factored out from ks_ldap_get and extended to
support the paged mode.
(ks_ldap_get):  Implement the pages mode for --first and --next.
* dirmngr/server.c (cmd_ks_get): Provide a dummy passphrase in --first
mode.
* dirmngr/Makefile.am (dirmngr_LDADD): Add LBER_LIBS.
--

The paged mode allows to retrieve more items than the servers usually
limit (e.g. 1000 for an LDS).  This patch also allows to use --first
without a patter to retrieve all keyblocks (except for disabled and
revoked keys).

GnuPG-bug-id: 6224

1 files changed, 11 insertions, 0 deletions

diff --git a/dirmngr/server.c b/dirmngr/server.c
index c97804277..04ebfd317 100644
--- a/dirmngr/server.c
+++ b/dirmngr/server.c
@@ -2585,6 +2585,17 @@ cmd_ks_get (assuan_context_t ctx, char *line)
       goto leave;
     }
 
+  if (!list && (flags & KS_GET_FLAG_FIRST))
+    {
+      /* Need to add a dummy pattern if no pattern is given.  */
+      if (!add_to_strlist_try (&list, ""))
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+
+
   if ((flags & KS_GET_FLAG_NEXT))
     {
       if (list || (flags & ~KS_GET_FLAG_NEXT))