kbx: Add framework for the SEARCH command

* kbx/backend-kbx.c: New.
* kbx/backend-support.c: New.
* kbx/backend.h: New.
* kbx/frontend.c: New.
* kbx/frontend.h: New.
* kbx/kbxserver.c: Implement SEARCH and NEXT command.
* kbx/keybox-search-desc.h (enum pubkey_types): New.
* kbx/keybox-search.c (keybox_get_data): New.
* kbx/keyboxd.c (main): Add a standard resource.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 95 insertions, 0 deletions

diff --git a/kbx/backend.h b/kbx/backend.h
new file mode 100644
index 000000000..e96f5023c
--- /dev/null
+++ b/kbx/backend.h
@@ -0,0 +1,95 @@
+/* backend.h - Definitions for keyboxd backends
+ * Copyright (C) 2019 g10 Code GmbH
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef KBX_BACKEND_H
+#define KBX_BACKEND_H
+
+#include "keybox-search-desc.h"
+
+/* Forward declaration of the keybox handle type.  */
+struct keybox_handle;
+typedef struct keybox_handle *KEYBOX_HANDLE;
+
+
+/* The types of the backends.  */
+enum database_types
+  {
+   DB_TYPE_NONE,   /* No database at all (unitialized etc.).  */
+   DB_TYPE_KBX     /* Keybox type database (backend-kbx.c).   */
+  };
+
+
+/* Declaration of the backend handle.  Each backend uses its own
+ * hidden handle structure with the only common thing being that the
+ * first field is the database_type to help with debugging.  */
+struct backend_handle_s;
+typedef struct backend_handle_s *backend_handle_t;
+
+
+/* Object to store backend specific databsde information per database
+ * handle.  */
+struct db_request_part_s
+{
+  struct db_request_part_s *next;
+
+  /* Id of the backend instance this object pertains to.  */
+  unsigned int backend_id;
+
+  /* The handle used for a KBX backend or NULL.  */
+  KEYBOX_HANDLE kbx_hd;
+};
+typedef struct db_request_part_s *db_request_part_t;
+
+
+/* A database request handle.  This keeps per session search
+ * information as well as a list of per-backend infos.  */
+struct db_request_s
+{
+  unsigned int any_search:1;  /* Any search has been done.  */
+  unsigned int any_found:1;   /* Any object has been found.  */
+
+  db_request_part_t part;
+
+  /* Counter to track the next to be searched database index.  */
+  unsigned int next_dbidx;
+};
+
+
+
+/*-- backend-support.c --*/
+const char *strdbtype (enum database_types t);
+unsigned int be_new_backend_id (void);
+void be_generic_release_backend (ctrl_t ctrl, backend_handle_t hd);
+void be_release_request (db_request_t req);
+gpg_error_t be_return_pubkey (ctrl_t ctrl, void *buffer, size_t buflen,
+                              enum pubkey_types pubkey_type);
+
+
+/*-- backend-kbx.c --*/
+gpg_error_t be_kbx_add_resource (ctrl_t ctrl, backend_handle_t *r_hd,
+                                 const char *filename, int readonly);
+void be_kbx_release_resource (ctrl_t ctrl, backend_handle_t hd);
+
+void be_kbx_release_kbx_hd (KEYBOX_HANDLE kbx_hd);
+gpg_error_t be_kbx_search (ctrl_t ctrl, backend_handle_t hd,
+                           db_request_t request,
+                           KEYDB_SEARCH_DESC *desc, unsigned int ndesc);
+
+
+#endif /*KBX_BACKEND_H*/