1 files changed, 219 insertions, 0 deletions

diff --git a/src/service/fs/fs_list_indexed.c b/src/service/fs/fs_list_indexed.c
new file mode 100644
index 000000000..78816cad1
--- /dev/null
+++ b/src/service/fs/fs_list_indexed.c
@@ -0,0 +1,219 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2003, 2004, 2006, 2009 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file fs/fs_list_indexed.c
+ * @author Christian Grothoff
+ * @brief provide a list of all indexed files
+ */
+
+#include "platform.h"
+#include "gnunet_constants.h"
+
+#include "gnunet_fs_service.h"
+#include "gnunet_protocols.h"
+#include "fs_api.h"
+
+
+/**
+ * Context for #GNUNET_FS_get_indexed_files().
+ */
+struct GNUNET_FS_GetIndexedContext
+{
+  /**
+   * Connection to the FS service.
+   */
+  struct GNUNET_MQ_Handle *mq;
+
+  /**
+   * Function to call for each indexed file.
+   */
+  GNUNET_FS_IndexedFileProcessor iterator;
+
+  /**
+   * Closure for @e iterator.
+   */
+  void *iterator_cls;
+
+  /**
+   * Continuation to trigger at the end.
+   */
+  GNUNET_SCHEDULER_TaskCallback cont;
+
+  /**
+   * Closure for @e cont.
+   */
+  void *cont_cls;
+};
+
+
+/**
+ * Function called on each response from the FS
+ * service with information about indexed files.
+ *
+ * @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
+ * @param msg message with indexing information
+ */
+static void
+handle_index_info_end (void *cls,
+                       const struct GNUNET_MessageHeader *msg)
+{
+  struct GNUNET_FS_GetIndexedContext *gic = cls;
+
+  (void) gic->iterator (gic->iterator_cls,
+                        NULL,
+                        NULL);
+  GNUNET_FS_get_indexed_files_cancel (gic);
+}
+
+
+/**
+ * Check validity of response from the FS
+ * service with information about indexed files.
+ *
+ * @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
+ * @param iim message with indexing information
+ */
+static int
+check_index_info (void *cls,
+                  const struct IndexInfoMessage *iim)
+{
+  uint16_t msize = ntohs (iim->header.size) - sizeof(*iim);
+  const char *filename;
+
+  filename = (const char *) &iim[1];
+  if (filename[msize - 1] != '\0')
+  {
+    GNUNET_break (0);
+    return GNUNET_SYSERR;
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Function called on each response from the FS
+ * service with information about indexed files.
+ *
+ * @param cls closure (of type `struct GNUNET_FS_GetIndexedContext *`)
+ * @param iim message with indexing information
+ */
+static void
+handle_index_info (void *cls,
+                   const struct IndexInfoMessage *iim)
+{
+  struct GNUNET_FS_GetIndexedContext *gic = cls;
+  const char *filename;
+
+  filename = (const char *) &iim[1];
+  if (GNUNET_OK !=
+      gic->iterator (gic->iterator_cls,
+                     filename,
+                     &iim->file_id))
+  {
+    GNUNET_FS_get_indexed_files_cancel (gic);
+    return;
+  }
+}
+
+
+/**
+ * Generic error handler, called with the appropriate error code and
+ * the same closure specified at the creation of the message queue.
+ * Not every message queue implementation supports an error handler.
+ *
+ * @param cls closure with the `struct GNUNET_FS_GetIndexedContent *`
+ * @param error error code
+ */
+static void
+mq_error_handler (void *cls,
+                  enum GNUNET_MQ_Error error)
+{
+  struct GNUNET_FS_GetIndexedContext *gic = cls;
+
+  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+              "Failed to receive response from `%s' service (error code is %d).\n",
+              "fs",
+              error);
+  (void) gic->iterator (gic->iterator_cls,
+                        NULL,
+                        NULL);
+  GNUNET_FS_get_indexed_files_cancel (gic);
+}
+
+
+struct GNUNET_FS_GetIndexedContext *
+GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
+                             GNUNET_FS_IndexedFileProcessor iterator,
+                             void *iterator_cls)
+{
+  struct GNUNET_FS_GetIndexedContext *gic
+    = GNUNET_new (struct GNUNET_FS_GetIndexedContext);
+  struct GNUNET_MQ_MessageHandler handlers[] = {
+    GNUNET_MQ_hd_fixed_size (index_info_end,
+                             GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END,
+                             struct GNUNET_MessageHeader,
+                             gic),
+    GNUNET_MQ_hd_var_size (index_info,
+                           GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY,
+                           struct IndexInfoMessage,
+                           gic),
+    GNUNET_MQ_handler_end ()
+  };
+  struct GNUNET_MQ_Envelope *env;
+  struct GNUNET_MessageHeader *msg;
+
+  gic->mq = GNUNET_CLIENT_connect (h->cfg,
+                                   "fs",
+                                   handlers,
+                                   &mq_error_handler,
+                                   h);
+  if (NULL == gic->mq)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _ ("Failed to not connect to `%s' service.\n"),
+                "fs");
+    GNUNET_free (gic);
+    return NULL;
+  }
+  gic->iterator = iterator;
+  gic->iterator_cls = iterator_cls;
+  env = GNUNET_MQ_msg (msg,
+                       GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET);
+  GNUNET_MQ_send (gic->mq,
+                  env);
+  return gic;
+}
+
+
+/**
+ * Cancel iteration over all indexed files.
+ *
+ * @param gic operation to cancel
+ */
+void
+GNUNET_FS_get_indexed_files_cancel (struct GNUNET_FS_GetIndexedContext *gic)
+{
+  GNUNET_MQ_destroy (gic->mq);
+  GNUNET_free (gic);
+}
+
+
+/* end of fs_list_indexed.c */