-added core functionality of the messenger service

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

formatting messenger code

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-completed core functionality of messenger service

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-code cleanup and reuse

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

+added structure to memberships of rooms

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-implemented member permission checks and deletion of messages

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-moved solving requests out of updating last messages (also forward before update)

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-reduced complexity of permisson check and changed load/save of rooms

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added save/load for accessed keys and basement peers of a room

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-implemented save/load for members with their history and session

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-abstracted management of egos and contacts

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fix warning

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-abstracted management of members

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed and adjusted test case

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-separated handling of direct and anonymous contacts

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-messenger added member-sessions which fix multiple edge cases, also additional cleanup

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-updated docs and fixed memory leak

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-changed info messages and added protocol version exchange

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-adjusted client api to use contacts from sessions

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added more logging and fixed wrong session usage

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-adjusted comm0 test case and removed adding members from checking messages

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed test-case for peer exchange

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-getting multiple peers connected in test-case with cadet

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed wrong assert and added tunnel version check

-simplified handling and forwarding

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed merging last messages and cycling info messages

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-automated adding sessions and members

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-corrected use of identity keys and signatures

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-adding local joining on entering external room

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed test-case comm0

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added more test-cases with generic setup

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed multiple simultaneous channels blocking each other

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-making test-cases more precise

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added check of members in test-cases, reduced merge messages

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-unified delayed operations: requests, deletions and merges

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-finished handling of operations

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed member session historystorage, added request permission check and padding for transmission

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-improved padding and removed automatic recursive requests

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-implemented filter for sending messages and added private messages to API level

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-wrong setups fixed with proper ego lookups

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-fixed problem with anonymous ego and changed to discrete-level padding

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added links to replace deleted messages, added local deletion and fixed anonymous id changing

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

-added session completion and removal through completion process

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>

1 files changed, 379 insertions, 0 deletions

diff --git a/src/messenger/gnunet-service-messenger_member.c b/src/messenger/gnunet-service-messenger_member.c
new file mode 100644
index 000000000..6e39cec13
--- /dev/null
+++ b/src/messenger/gnunet-service-messenger_member.c
@@ -0,0 +1,379 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2021 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/gnunet-service-messenger_member.c
+ * @brief GNUnet MESSENGER service
+ */
+
+#include "gnunet-service-messenger_member.h"
+
+#include "gnunet-service-messenger_member_session.h"
+
+struct GNUNET_MESSENGER_Member*
+create_member (struct GNUNET_MESSENGER_MemberStore *store, const struct GNUNET_ShortHashCode *id)
+{
+  GNUNET_assert (store);
+
+  struct GNUNET_MESSENGER_Member *member = GNUNET_new(struct GNUNET_MESSENGER_Member);
+
+  member->store = store;
+
+  if (id)
+    GNUNET_memcpy(&(member->id), id, sizeof(member->id));
+  else if (GNUNET_YES != generate_free_member_id(&(member->id), store->members))
+  {
+    GNUNET_free (member);
+    return NULL;
+  }
+
+  member->sessions = GNUNET_CONTAINER_multihashmap_create(2, GNUNET_NO);
+
+  return member;
+}
+
+static int
+iterate_destroy_session (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+  destroy_member_session(session);
+  return GNUNET_YES;
+}
+
+void
+destroy_member (struct GNUNET_MESSENGER_Member *member)
+{
+  GNUNET_assert((member) && (member->sessions));
+
+  GNUNET_CONTAINER_multihashmap_iterate (member->sessions, iterate_destroy_session, NULL);
+  GNUNET_CONTAINER_multihashmap_destroy (member->sessions);
+
+  GNUNET_free (member);
+}
+
+const struct GNUNET_ShortHashCode*
+get_member_id (const struct GNUNET_MESSENGER_Member *member)
+{
+  GNUNET_assert (member);
+
+  return &(member->id);
+}
+
+static int
+callback_scan_for_sessions (void *cls, const char *filename)
+{
+  struct GNUNET_MESSENGER_Member *member = cls;
+
+  if (GNUNET_YES == GNUNET_DISK_directory_test (filename, GNUNET_YES))
+  {
+    char *directory;
+
+    GNUNET_asprintf (&directory, "%s%c", filename, DIR_SEPARATOR);
+
+    load_member_session(member, directory);
+  }
+
+  return GNUNET_OK;
+}
+
+void
+load_member (struct GNUNET_MESSENGER_MemberStore *store, const char *directory)
+{
+  GNUNET_assert ((store) && (directory));
+
+  char *config_file;
+  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
+
+  struct GNUNET_MESSENGER_Member *member = NULL;
+
+  if (GNUNET_YES != GNUNET_DISK_file_test (config_file))
+    goto free_config;
+
+  struct GNUNET_CONFIGURATION_Handle *cfg = GNUNET_CONFIGURATION_create ();
+
+  if (GNUNET_OK == GNUNET_CONFIGURATION_parse (cfg, config_file))
+  {
+    struct GNUNET_ShortHashCode id;
+
+    if (GNUNET_OK != GNUNET_CONFIGURATION_get_data (cfg, "member", "id", &id, sizeof(id)))
+      goto destroy_config;
+
+    member = add_store_member(store, &id);
+  }
+
+destroy_config:
+
+  GNUNET_CONFIGURATION_destroy (cfg);
+
+free_config:
+  GNUNET_free(config_file);
+
+  if (!member)
+    return;
+
+  char *scan_dir;
+  GNUNET_asprintf (&scan_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
+
+  if (GNUNET_OK == GNUNET_DISK_directory_test (scan_dir, GNUNET_YES))
+    GNUNET_DISK_directory_scan (scan_dir, callback_scan_for_sessions, member);
+
+  GNUNET_free(scan_dir);
+}
+
+static int
+iterate_load_next_session (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  const char* sessions_directory = cls;
+
+  char* load_dir;
+  GNUNET_asprintf (&load_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
+
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+
+  if (GNUNET_YES == GNUNET_DISK_directory_test (load_dir, GNUNET_YES))
+    load_member_session_next (session, load_dir);
+
+  GNUNET_free (load_dir);
+  return GNUNET_YES;
+}
+
+void
+load_member_next_sessions (const struct GNUNET_MESSENGER_Member *member, const char *directory)
+{
+  GNUNET_assert ((member) && (directory));
+
+  char* load_dir;
+  GNUNET_asprintf (&load_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
+
+  GNUNET_CONTAINER_multihashmap_iterate (member->sessions, iterate_load_next_session, load_dir);
+
+  GNUNET_free(load_dir);
+}
+
+static int
+iterate_save_session (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  const char* sessions_directory = cls;
+
+  char* save_dir;
+  GNUNET_asprintf (&save_dir, "%s%s%c", sessions_directory, GNUNET_h2s(key), DIR_SEPARATOR);
+
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+
+  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
+      (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
+    save_member_session (session, save_dir);
+
+  GNUNET_free (save_dir);
+  return GNUNET_YES;
+}
+
+void
+save_member (struct GNUNET_MESSENGER_Member *member, const char *directory)
+{
+  GNUNET_assert ((member) && (directory));
+
+  char *config_file;
+  GNUNET_asprintf (&config_file, "%s%s", directory, "member.cfg");
+
+  struct GNUNET_CONFIGURATION_Handle *cfg = GNUNET_CONFIGURATION_create ();
+
+  char *id_data = GNUNET_STRINGS_data_to_string_alloc (&(member->id), sizeof(member->id));
+
+  if (id_data)
+  {
+    GNUNET_CONFIGURATION_set_value_string (cfg, "member", "id", id_data);
+
+    GNUNET_free(id_data);
+  }
+
+  GNUNET_CONFIGURATION_write (cfg, config_file);
+  GNUNET_CONFIGURATION_destroy (cfg);
+
+  GNUNET_free(config_file);
+
+  char* save_dir;
+  GNUNET_asprintf (&save_dir, "%s%s%c", directory, "sessions", DIR_SEPARATOR);
+
+  if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
+      (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
+    GNUNET_CONTAINER_multihashmap_iterate (member->sessions, iterate_save_session, save_dir);
+
+  GNUNET_free(save_dir);
+}
+
+static void
+sync_session_contact_from_next (struct GNUNET_MESSENGER_MemberSession *session, struct GNUNET_MESSENGER_MemberSession *next)
+{
+  GNUNET_assert((session) && (next));
+
+  if (session == next)
+    return;
+
+  if (next->next)
+    sync_session_contact_from_next (session, next->next);
+  else
+    session->contact = next->contact;
+}
+
+static int
+iterate_sync_session_contact (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+
+  if (session->next)
+    sync_session_contact_from_next (session, session->next);
+
+  return GNUNET_YES;
+}
+
+void
+sync_member_contacts (struct GNUNET_MESSENGER_Member *member)
+{
+  GNUNET_assert ((member) && (member->sessions));
+
+  GNUNET_CONTAINER_multihashmap_iterate (member->sessions, iterate_sync_session_contact, NULL);
+}
+
+struct GNUNET_MESSENGER_MemberSession*
+get_member_session (const struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *public_key)
+{
+  GNUNET_assert ((member) && (public_key));
+
+  struct GNUNET_HashCode hash;
+  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
+
+  return GNUNET_CONTAINER_multihashmap_get(member->sessions, &hash);
+}
+
+struct GNUNET_MESSENGER_ClosureSearchSession {
+  const struct GNUNET_MESSENGER_Message *message;
+  const struct GNUNET_HashCode *hash;
+
+  struct GNUNET_MESSENGER_MemberSession *match;
+};
+
+static int
+iterate_search_session (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_ClosureSearchSession* search = cls;
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+
+  if (GNUNET_OK != verify_member_session_as_sender(session, search->message, search->hash))
+    return GNUNET_YES;
+
+  search->match = session;
+  return GNUNET_NO;
+}
+
+static struct GNUNET_MESSENGER_MemberSession*
+try_member_session (struct GNUNET_MESSENGER_Member *member, const struct GNUNET_IDENTITY_PublicKey *public_key)
+{
+  struct GNUNET_MESSENGER_MemberSession* session = get_member_session(member, public_key);
+
+  if (session)
+    return session;
+
+  session = create_member_session(member, public_key);
+
+  if (session)
+    add_member_session(member, session);
+
+  return session;
+}
+
+struct GNUNET_MESSENGER_MemberSession*
+get_member_session_of (struct GNUNET_MESSENGER_Member *member, const struct GNUNET_MESSENGER_Message *message,
+                       const struct GNUNET_HashCode *hash)
+{
+  GNUNET_assert ((member) && (message) && (hash) &&
+                 (0 == GNUNET_memcmp(&(member->id), &(message->header.sender_id))));
+
+  if (GNUNET_MESSENGER_KIND_INFO == message->header.kind)
+    return try_member_session(member, &(message->body.info.host_key));
+  else if (GNUNET_MESSENGER_KIND_JOIN == message->header.kind)
+    return try_member_session(member, &(message->body.join.key));
+
+  struct GNUNET_MESSENGER_ClosureSearchSession search;
+
+  search.message = message;
+  search.hash = hash;
+
+  search.match = NULL;
+  GNUNET_CONTAINER_multihashmap_iterate(member->sessions, iterate_search_session, &search);
+
+  return search.match;
+}
+
+void
+add_member_session (struct GNUNET_MESSENGER_Member *member, struct GNUNET_MESSENGER_MemberSession *session)
+{
+  if (!session)
+    return;
+
+  GNUNET_assert((member) && (session->member == member));
+
+  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
+
+  struct GNUNET_HashCode hash;
+  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
+
+  GNUNET_CONTAINER_multihashmap_put(member->sessions, &hash, session, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
+}
+
+void
+remove_member_session (struct GNUNET_MESSENGER_Member *member, struct GNUNET_MESSENGER_MemberSession *session)
+{
+  GNUNET_assert ((member) && (session) && (session->member == member));
+
+  const struct GNUNET_IDENTITY_PublicKey *public_key = get_member_session_public_key(session);
+
+  struct GNUNET_HashCode hash;
+  GNUNET_CRYPTO_hash(public_key, sizeof(*public_key), &hash);
+
+  GNUNET_CONTAINER_multihashmap_remove(member->sessions, &hash, session);
+}
+
+struct GNUNET_MESSENGER_ClosureIterateSessions {
+  GNUNET_MESSENGER_MemberIteratorCallback it;
+  void *cls;
+};
+
+static int
+iterate_member_sessions_it (void *cls, const struct GNUNET_HashCode *key, void *value)
+{
+  struct GNUNET_MESSENGER_ClosureIterateSessions *iterate = cls;
+  struct GNUNET_MESSENGER_MemberSession *session = value;
+
+  return iterate->it (iterate->cls, get_member_session_public_key(session), session);
+}
+
+int
+iterate_member_sessions (struct GNUNET_MESSENGER_Member *member, GNUNET_MESSENGER_MemberIteratorCallback it, void *cls)
+{
+  GNUNET_assert ((member) && (member->sessions) && (it));
+
+  struct GNUNET_MESSENGER_ClosureIterateSessions iterate;
+
+  iterate.it = it;
+  iterate.cls = cls;
+
+  return GNUNET_CONTAINER_multihashmap_iterate(member->sessions, iterate_member_sessions_it, &iterate);
+}