1 files changed, 237 insertions, 0 deletions

diff --git a/src/service/messenger/messenger_api_list_tunnels.c b/src/service/messenger/messenger_api_list_tunnels.c
new file mode 100644
index 000000000..b2513370c
--- /dev/null
+++ b/src/service/messenger/messenger_api_list_tunnels.c
@@ -0,0 +1,237 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2023 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
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/messenger_api_list_tunnels.c
+ * @brief messenger api: client and service implementation of GNUnet MESSENGER service
+ */
+
+#include "platform.h"
+#include "messenger_api_list_tunnels.h"
+
+void
+init_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels)
+{
+  GNUNET_assert (tunnels);
+
+  tunnels->head = NULL;
+  tunnels->tail = NULL;
+}
+
+
+void
+clear_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels)
+{
+  GNUNET_assert (tunnels);
+
+  struct GNUNET_MESSENGER_ListTunnel *element;
+  for (element = tunnels->head; element; element = remove_from_list_tunnels (
+         tunnels, element))
+
+    tunnels->head = NULL;
+  tunnels->tail = NULL;
+}
+
+
+static int
+compare_list_tunnels (void *cls,
+                      struct GNUNET_MESSENGER_ListTunnel *element0,
+                      struct GNUNET_MESSENGER_ListTunnel *element1)
+{
+  return ((int) element0->peer) - ((int) element1->peer);
+}
+
+
+void
+add_to_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                     const struct GNUNET_PeerIdentity *peer,
+                     const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert ((tunnels) && (peer));
+
+  struct GNUNET_MESSENGER_ListTunnel *element = GNUNET_new (struct
+                                                            GNUNET_MESSENGER_ListTunnel);
+
+  element->peer = GNUNET_PEER_intern (peer);
+  element->hash = hash ? GNUNET_memdup (hash, sizeof(struct GNUNET_HashCode)) :
+                  NULL;
+
+  GNUNET_CONTAINER_DLL_insert_sorted (struct GNUNET_MESSENGER_ListTunnel,
+                                      compare_list_tunnels, NULL, tunnels->head,
+                                      tunnels->tail, element);
+}
+
+
+struct GNUNET_MESSENGER_ListTunnel*
+find_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const struct GNUNET_PeerIdentity *peer,
+                   size_t *index)
+{
+  GNUNET_assert ((tunnels) && (peer));
+
+  struct GNUNET_MESSENGER_ListTunnel *element;
+  struct GNUNET_PeerIdentity pid;
+
+  if (index)
+    *index = 0;
+
+  for (element = tunnels->head; element; element = element->next)
+  {
+    GNUNET_PEER_resolve (element->peer, &pid);
+
+    if (0 == GNUNET_memcmp (&pid, peer))
+      return element;
+
+    if (index)
+      (*index) = (*index) + 1;
+  }
+
+  return NULL;
+}
+
+
+void
+update_to_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                        const struct GNUNET_PeerIdentity *peer,
+                        const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert ((tunnels) && (peer));
+
+  struct GNUNET_MESSENGER_ListTunnel *element = find_list_tunnels (tunnels,
+                                                                   peer,
+                                                                   NULL);
+  if (! element)
+    return;
+
+  if (element->hash)
+  {
+    if (hash)
+      GNUNET_memcpy (element->hash, hash, sizeof(struct GNUNET_HashCode));
+    else
+    {
+      GNUNET_free (element->hash);
+      element->hash = NULL;
+    }
+  }
+  else if (hash)
+    element->hash = GNUNET_memdup (hash, sizeof(struct GNUNET_HashCode));
+}
+
+
+int
+contains_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                       const struct GNUNET_PeerIdentity *peer)
+{
+  GNUNET_assert ((tunnels) && (peer));
+
+  return find_list_tunnels (tunnels, peer, NULL) != NULL ? GNUNET_YES :
+         GNUNET_NO;
+}
+
+
+struct GNUNET_MESSENGER_ListTunnel*
+remove_from_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                          struct GNUNET_MESSENGER_ListTunnel *element)
+{
+  GNUNET_assert ((tunnels) && (element));
+
+  struct GNUNET_MESSENGER_ListTunnel *next = element->next;
+
+  if ((tunnels->head) && (tunnels->tail))
+    GNUNET_CONTAINER_DLL_remove (tunnels->head, tunnels->tail, element);
+
+  if (element->hash)
+    GNUNET_free (element->hash);
+
+  GNUNET_PEER_change_rc (element->peer, -1);
+  GNUNET_free (element);
+
+  return next;
+}
+
+
+void
+load_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const char *path)
+{
+  GNUNET_assert ((tunnels) && (path));
+
+  if (GNUNET_YES != GNUNET_DISK_file_test (path))
+    return;
+
+  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ
+                                                   | GNUNET_DISK_PERM_USER_WRITE);
+
+  struct GNUNET_DISK_FileHandle *handle = GNUNET_DISK_file_open (
+    path, GNUNET_DISK_OPEN_READ, permission
+    );
+
+  if (! handle)
+    return;
+
+  GNUNET_DISK_file_seek (handle, 0, GNUNET_DISK_SEEK_SET);
+
+  struct GNUNET_PeerIdentity peer;
+  ssize_t len;
+
+  do {
+    len = GNUNET_DISK_file_read (handle, &peer, sizeof(peer));
+
+    if (len != sizeof(peer))
+      break;
+
+    add_to_list_tunnels (tunnels, &peer, NULL);
+  } while (len == sizeof(peer));
+
+  GNUNET_DISK_file_close (handle);
+}
+
+
+void
+save_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const char *path)
+{
+  GNUNET_assert ((tunnels) && (path));
+
+  enum GNUNET_DISK_AccessPermissions permission = (GNUNET_DISK_PERM_USER_READ
+                                                   | GNUNET_DISK_PERM_USER_WRITE);
+
+  struct GNUNET_DISK_FileHandle *handle = GNUNET_DISK_file_open (
+    path, GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_WRITE, permission
+    );
+
+  if (! handle)
+    return;
+
+  GNUNET_DISK_file_seek (handle, 0, GNUNET_DISK_SEEK_SET);
+
+  struct GNUNET_MESSENGER_ListTunnel *element;
+  struct GNUNET_PeerIdentity pid;
+
+  for (element = tunnels->head; element; element = element->next)
+  {
+    GNUNET_PEER_resolve (element->peer, &pid);
+
+    GNUNET_DISK_file_write (handle, &pid, sizeof(pid));
+  }
+
+  GNUNET_DISK_file_sync (handle);
+  GNUNET_DISK_file_close (handle);
+}