kbx: Add new command DELETE.

* kbx/kbxserver.c (cmd_delete): New.
* kbx/frontend.c (kbxd_delete): New.
* kbx/backend-kbx.c (be_kbx_delete): New.

Signed-off-by: Werner Koch <wk@gnupg.org>

kbx/backend-kbx.c

@@ -425,3 +425,33 @@ be_kbx_update (ctrl_t ctrl, backend_handle_t backend_hd,
   ksba_cert_release (cert);
   return err;
 }
+
+
+/* Delete the blob from the keybox.  BACKEND_HD is the handle for
+ * this backend and REQUEST is the current database request object.  */
+gpg_error_t
+be_kbx_delete (ctrl_t ctrl, backend_handle_t backend_hd, db_request_t request)
+{
+  gpg_error_t err;
+  db_request_part_t part;
+  ksba_cert_t cert = NULL;
+
+  (void)ctrl;
+
+  log_assert (backend_hd && backend_hd->db_type == DB_TYPE_KBX);
+  log_assert (request);
+
+  /* Find the specific request part or allocate it.  */
+  err = be_find_request_part (backend_hd, request, &part);
+  if (err)
+    goto leave;
+
+  /* FIXME: We make use of the fact that we know that the caller
+   * already did a keybox search.  This needs to be made more
+   * explicit.  */
+  err = keybox_delete (part->kbx_hd);
+
+ leave:
+  ksba_cert_release (cert);
+  return err;
+}

kbx/backend.h

@@ -144,6 +144,8 @@ gpg_error_t be_kbx_insert (ctrl_t ctrl, backend_handle_t backend_hd,
 gpg_error_t be_kbx_update (ctrl_t ctrl, backend_handle_t backend_hd,
                            db_request_t request, enum pubkey_types pktype,
                            const void *blob, size_t bloblen);
+gpg_error_t be_kbx_delete (ctrl_t ctrl, backend_handle_t backend_hd,
+                           db_request_t request);
 
 
 #endif /*KBX_BACKEND_H*/

kbx/frontend.c

@@ -469,3 +469,67 @@ kbxd_store (ctrl_t ctrl, const void *blob, size_t bloblen,
     log_clock ("%s: leave", __func__);
   return err;
 }
+
+
+
+
+/* Delete; remove the blob identified by UBID.  */
+gpg_error_t
+kbxd_delete (ctrl_t ctrl, const unsigned char *ubid)
+{
+  gpg_error_t err;
+  db_request_t request;
+  unsigned int dbidx;
+  db_desc_t db;
+
+  if (DBG_CLOCK)
+    log_clock ("%s: enter", __func__);
+
+  take_read_write_lock (ctrl);
+
+  /* Allocate a handle object if none exists for this context.  */
+  if (!ctrl->opgp_req)
+    {
+      ctrl->opgp_req = xtrycalloc (1, sizeof *ctrl->opgp_req);
+      if (!ctrl->opgp_req)
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+  request = ctrl->opgp_req;
+
+  /* FIXME: We force the use of the KBX backend.  */
+  for (dbidx=0; dbidx < no_of_databases; dbidx++)
+    if (databases[dbidx].db_type == DB_TYPE_KBX)
+      break;
+  if (!(dbidx < no_of_databases))
+    {
+      err = gpg_error (GPG_ERR_NOT_INITIALIZED);
+      goto leave;
+    }
+  db = databases + dbidx;
+
+  err = be_kbx_seek (ctrl, db->backend_handle, request, ubid);
+  if (!err)
+    ; /* Found - we can delete.  */
+  else if (gpg_err_code (err) == GPG_ERR_EOF)
+    {
+      err = gpg_error (GPG_ERR_NOT_FOUND);
+      goto leave;
+    }
+  else
+    {
+      log_debug ("%s: searching primary fingerprint failed: %s\n",
+                 __func__, gpg_strerror (err));
+      goto leave;
+    }
+
+  err = be_kbx_delete (ctrl, db->backend_handle, request);
+
+ leave:
+  release_lock (ctrl);
+  if (DBG_CLOCK)
+    log_clock ("%s: leave", __func__);
+  return err;
+}

kbx/frontend.h

@@ -41,6 +41,7 @@ gpg_error_t kbxd_search (ctrl_t ctrl,
                          int reset);
 gpg_error_t kbxd_store (ctrl_t ctrl, const void *blob, size_t bloblen,
                         enum kbxd_store_modes mode);
+gpg_error_t kbxd_delete (ctrl_t ctrl, const unsigned char *ubid);
 
 
 #endif /*KBX_FRONTEND_H*/

kbx/kbxserver.c

@@ -522,6 +522,46 @@ cmd_store (assuan_context_t ctx, char *line)
 }
 
 
+static const char hlp_delete[] =
+  "DELETE <ubid> \n"
+  "\n"
+  "Delete a key into the database.  The UBID identifies the key.\n";
+static gpg_error_t
+cmd_delete (assuan_context_t ctx, char *line)
+{
+  ctrl_t ctrl = assuan_get_pointer (ctx);
+  gpg_error_t err;
+  int n;
+  unsigned char ubid[UBID_LEN];
+
+  line = skip_options (line);
+  if (!*line)
+    {
+      err = set_error (GPG_ERR_INV_ARG, "UBID missing");
+      goto leave;
+    }
+
+  /* Skip an optional UBID identifier character.  */
+  if (*line == '^' && line[1])
+    line++;
+  if ((n=hex2bin (line, ubid, UBID_LEN)) < 0)
+    {
+      err = set_error (GPG_ERR_INV_USER_ID, "invalid UBID");
+      goto leave;
+    }
+  if (line[n])
+    {
+      err = set_error (GPG_ERR_INV_ARG, "garbage after UBID");
+      goto leave;
+    }
+
+  err = kbxd_delete (ctrl, ubid);
+
+
+ leave:
+  return leave_cmd (ctx, err);
+}
+
 
 
 static const char hlp_getinfo[] =
@@ -643,6 +683,7 @@ register_commands (assuan_context_t ctx)
     { "SEARCH",     cmd_search,     hlp_search },
     { "NEXT",       cmd_next,       hlp_next   },
     { "STORE",      cmd_store,      hlp_store  },
+    { "DELETE",     cmd_delete,     hlp_delete  },
     { "GETINFO",    cmd_getinfo,    hlp_getinfo },
     { "OUTPUT",     NULL,           hlp_output },
     { "KILLKEYBOXD",cmd_killkeyboxd,hlp_killkeyboxd },