#include "gnunet_signal_lib.h"
#include "gnunet_util_lib.h"
#include "gnunet_datacache_lib.h"
+#include "gnunet_transport_service.h"
+#include "gnunet_hello_lib.h"
#include "dht.h"
/**
*/
static struct GNUNET_CORE_Handle *coreAPI;
+/**
+ * Handle to the transport service, for getting our hello
+ */
+static struct GNUNET_TRANSPORT_Handle *transport_handle;
+
/**
* The identity of our peer.
*/
static struct GNUNET_PeerIdentity my_identity;
+/**
+ * Our HELLO
+ */
+static struct GNUNET_MessageHeader *my_hello;
+
/**
* Task to run when we shut down, cleaning up all our trash
*/
static GNUNET_SCHEDULER_TaskIdentifier cleanup_task;
+
+/**
+ * Linked list of messages to send to clients.
+ */
+struct PendingMessage
+{
+ /**
+ * Pointer to next item in the list
+ */
+ struct PendingMessage *next;
+
+ /**
+ * Actual message to be sent
+ */
+ struct GNUNET_MessageHeader *msg;
+
+};
+
+/**
+ * Struct containing information about a client,
+ * handle to connect to it, and any pending messages
+ * that need to be sent to it.
+ */
+struct ClientList
+{
+ /**
+ * Linked list of active clients
+ */
+ struct ClientList *next;
+
+ /**
+ * The handle to this client
+ */
+ struct GNUNET_SERVER_Client *client_handle;
+
+ /**
+ * Handle to the current transmission request, NULL
+ * if none pending.
+ */
+ struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
+
+ /**
+ * Linked list of pending messages for this client
+ */
+ struct PendingMessage *pending_head;
+
+};
+
/**
* Context for handling results from a get request.
*/
/**
* The client to send the result to.
*/
- struct GNUNET_SERVER_Client *client;
+ struct ClientList *client;
/**
* The unique id of this request
unsigned long long unique_id;
};
-
+/**
+ * Context containing information about a DHT message received.
+ */
struct DHT_MessageContext
{
/**
* The client this request was received from.
*/
- struct GNUNET_SERVER_Client *client;
+ struct ClientList *client;
/**
* The key this request was about
};
/**
- * Server handler for handling locally received dht requests
+ * List of active clients.
+ */
+static struct ClientList *client_list;
+
+
+/**
+ * Server handlers for handling locally received dht requests
*/
static void
handle_dht_start_message (void *cls, struct GNUNET_SERVER_Client *client,
{NULL, 0, 0}
};
+/**
+ * Forward declaration.
+ */
+static size_t send_generic_reply (void *cls, size_t size, void *buf);
+
+/**
+ * Task run to check for messages that need to be sent to a client.
+ *
+ * @param cls a ClientList, containing the client and any messages to be sent to it
+ * @param tc reason this was called
+ */
+static void
+process_pending_messages (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct ClientList *client = cls;
+
+ if (client->pending_head == NULL) /* No messages queued */
+ {
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Have no pending messages for client.\n", "DHT");
+#endif
+ return;
+ }
+
+ if (client->transmit_handle == NULL) /* No current pending messages, we can try to send! */
+ client->transmit_handle =
+ GNUNET_SERVER_notify_transmit_ready (client->client_handle,
+ ntohs (client->pending_head->msg->
+ size),
+ GNUNET_TIME_relative_multiply
+ (GNUNET_TIME_UNIT_SECONDS, 5),
+ &send_generic_reply, client);
+ else
+ {
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Transmit handle is non-null.\n", "DHT");
+#endif
+ }
+}
+/**
+ * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
+ * request. A ClientList is passed as closure, take the head of the list
+ * and copy it into buf, which has the result of sending the message to the
+ * client.
+ *
+ * @param cls closure to this call
+ * @param size maximum number of bytes available to send
+ * @param buf where to copy the actual message to
+ *
+ * @return the number of bytes actually copied, 0 indicates failure
+ */
static size_t
-send_reply (void *cls, size_t size, void *buf)
+send_generic_reply (void *cls, size_t size, void *buf)
{
- struct GNUNET_DHT_Message *reply = cls;
+ struct ClientList *client = cls;
+ struct PendingMessage *reply = client->pending_head;
+ int ret;
+ client->transmit_handle = NULL;
if (buf == NULL) /* Message timed out, that's crappy... */
{
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "`%s': buffer was NULL\n", "DHT");
+#endif
+ client->pending_head = reply->next;
+ GNUNET_free (reply->msg);
GNUNET_free (reply);
return 0;
}
- if (size >= ntohs (reply->header.size))
+ if (size >= ntohs (reply->msg->size))
{
- memcpy (buf, reply, ntohs (reply->header.size));
- return ntohs (reply->header.size);
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Copying reply to buffer, REALLY SENT\n", "DHT");
+#endif
+ memcpy (buf, reply->msg, ntohs (reply->msg->size));
+
+ ret = ntohs (reply->msg->size);
}
else
- return 0;
+ ret = 0;
+
+ client->pending_head = reply->next;
+ GNUNET_free (reply->msg);
+ GNUNET_free (reply);
+
+ GNUNET_SCHEDULER_add_now (sched, &process_pending_messages, client);
+ return ret;
}
+/**
+ * Add a PendingMessage to the clients list of messages to be sent
+ *
+ * @param client the active client to send the message to
+ * @param pending_message the actual message to send
+ */
+static void
+add_pending_message (struct ClientList *client,
+ struct PendingMessage *pending_message)
+{
+ struct PendingMessage *pos;
+ struct PendingMessage *prev;
+
+ pos = client->pending_head;
+
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Adding pending message for client.\n", "DHT");
+#endif
+ if (pos == NULL)
+ {
+ client->pending_head = pending_message;
+ }
+ else /* This means another request is already queued, rely on send_reply to process all pending messages */
+ {
+ while (pos != NULL) /* Find end of list */
+ {
+ prev = pos;
+ pos = pos->next;
+ }
+
+ GNUNET_assert (prev != NULL);
+ prev->next = pending_message;
+ }
+
+ GNUNET_SCHEDULER_add_now (sched, &process_pending_messages, client);
+
+}
+
+/**
+ * Called when a reply needs to be sent to a client, either as
+ * a result it found to a GET or FIND PEER request.
+ *
+ * @param client the client to send the reply to
+ * @param message the encapsulated message to send
+ * @param uid the unique identifier of this request
+ */
static void
-send_reply_to_client (struct GNUNET_SERVER_Client *client,
+send_reply_to_client (struct ClientList *client,
struct GNUNET_MessageHeader *message,
unsigned long long uid)
{
struct GNUNET_DHT_Message *reply;
+ struct PendingMessage *pending_message;
+
size_t msize;
size_t tsize;
#if DEBUG_DHT
reply->unique_id = GNUNET_htonll (uid);
memcpy (&reply[1], message, msize);
- GNUNET_SERVER_notify_transmit_ready (client,
- tsize,
- GNUNET_TIME_relative_multiply
- (GNUNET_TIME_UNIT_SECONDS, 5),
- &send_reply, reply);
+ pending_message = GNUNET_malloc (sizeof (struct PendingMessage));
+ pending_message->msg = &reply->header;
+ add_pending_message (client, pending_message);
}
/**
- * Iterator for local get request results, return
- * GNUNET_OK to continue iteration, anything else
+ * Iterator for local get request results,
+ *
+ * @param cls closure for iterator, a DatacacheGetContext
+ * @param exp when does this value expire?
+ * @param key the key this data is stored under
+ * @param size the size of the data identified by key
+ * @param data the actual data
+ * @param type the type of the data
+ *
+ * @return GNUNET_OK to continue iteration, anything else
* to stop iteration.
*/
static int
{
struct DatacacheGetContext *datacache_get_ctx = cls;
struct GNUNET_DHT_GetResultMessage *get_result;
-
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Received `%s' response from datacache\n", "DHT", "GET");
+#endif
get_result =
GNUNET_malloc (sizeof (struct GNUNET_DHT_GetResultMessage) + size);
get_result->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_GET_RESULT);
/**
* Server handler for initiating local dht get requests
+ *
+ * @param cls closure for service
+ * @param get_msg the actual get message
+ * @param message_context struct containing pertinent information about the get request
+ *
*/
static void
handle_dht_get (void *cls, struct GNUNET_DHT_GetMessage *get_msg,
if (datacache != NULL)
results =
GNUNET_DATACACHE_get (datacache, message_context->key, get_type,
- datacache_get_iterator, datacache_get_context);
+ &datacache_get_iterator, datacache_get_context);
#if DEBUG_DHT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
/**
* Server handler for initiating local dht find peer requests
+ *
+ * @param cls closure for service
+ * @param find_msg the actual find peer message
+ * @param message_context struct containing pertinent information about the request
+ *
*/
static void
handle_dht_find_peer (void *cls, struct GNUNET_DHT_FindPeerMessage *find_msg,
struct DHT_MessageContext *message_context)
{
+ struct GNUNET_DHT_FindPeerResultMessage *find_peer_result;
+ size_t hello_size;
+ size_t tsize;
#if DEBUG_DHT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"`%s': Received `%s' request from client, key %s (msg size %d, we expected %d)\n",
GNUNET_assert (ntohs (find_msg->header.size) >=
sizeof (struct GNUNET_DHT_FindPeerMessage));
+ if (my_hello == NULL)
+ {
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "`%s': Our HELLO is null, can't return.\n",
+ "DHT");
+#endif
+
+ return;
+ }
+
+ /* Simplistic find_peer functionality, always return our hello */
+ hello_size = ntohs(my_hello->size);
+ tsize = hello_size + sizeof (struct GNUNET_DHT_FindPeerResultMessage);
+ find_peer_result = GNUNET_malloc (tsize);
+ find_peer_result->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_FIND_PEER_RESULT);
+ find_peer_result->header.size = htons (tsize);
+ find_peer_result->data_size = htons (hello_size);
+ memcpy(&find_peer_result->peer, &my_identity, sizeof(struct GNUNET_PeerIdentity));
+ memcpy (&find_peer_result[1], &my_hello, hello_size);
+
+ send_reply_to_client(message_context->client, &find_peer_result->header, message_context->unique_id);
+ GNUNET_free(find_peer_result);
/* FIXME: Implement find peer functionality here */
}
/**
* Server handler for initiating local dht put requests
+ *
+ * @param cls closure for service
+ * @param put_msg the actual put message
+ * @param message_context struct containing pertinent information about the request
*/
static void
handle_dht_put (void *cls, struct GNUNET_DHT_PutMessage *put_msg,
}
+
/**
- * Context for sending receipt confirmations. Not used yet.
+ * Find a client if it exists, add it otherwise.
+ *
+ * @param client the server handle to the client
+ *
+ * @return the client if found, a new client otherwise
*/
-struct SendConfirmationContext
+static struct ClientList *
+find_active_client (struct GNUNET_SERVER_Client *client)
{
- /**
- * The message to send.
- */
- struct GNUNET_DHT_StopMessage *message;
-
- /**
- * Transmit handle.
- */
- struct GNUNET_CONNECTION_TransmitHandle *transmit_handle;
-};
+ struct ClientList *pos = client_list;
+ struct ClientList *ret;
-static size_t
-send_confirmation (void *cls, size_t size, void *buf)
-{
- struct GNUNET_DHT_StopMessage *confirmation_message = cls;
-
- if (buf == NULL) /* Message timed out, that's crappy... */
+ while (pos != NULL)
{
- GNUNET_free (confirmation_message);
- return 0;
+ if (pos->client_handle == client)
+ return pos;
+ pos = pos->next;
}
- if (size >= ntohs (confirmation_message->header.size))
- {
- memcpy (buf, confirmation_message,
- ntohs (confirmation_message->header.size));
- return ntohs (confirmation_message->header.size);
- }
- else
- return 0;
-}
+ ret = GNUNET_malloc (sizeof (struct ClientList));
+ ret->client_handle = client;
+ ret->next = client_list;
+ client_list = ret;
+ ret->pending_head = NULL;
+ return ret;
+}
+/**
+ * Construct a message receipt confirmation for a particular uid.
+ * Receipt confirmations are used for any requests that don't expect
+ * a reply otherwise (i.e. put requests, stop requests).
+ *
+ * @param client the handle for the client
+ * @param uid the unique identifier of this message
+ */
static void
send_client_receipt_confirmation (struct GNUNET_SERVER_Client *client,
uint64_t uid)
{
struct GNUNET_DHT_StopMessage *confirm_message;
+ struct ClientList *active_client;
+ struct PendingMessage *pending_message;
#if DEBUG_DHT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
htons (sizeof (struct GNUNET_DHT_StopMessage));
confirm_message->unique_id = GNUNET_htonll (uid);
- GNUNET_SERVER_notify_transmit_ready (client,
- sizeof (struct GNUNET_DHT_StopMessage),
- GNUNET_TIME_relative_multiply
- (GNUNET_TIME_UNIT_SECONDS, 5),
- &send_confirmation, confirm_message);
+ active_client = find_active_client (client);
+ pending_message = GNUNET_malloc (sizeof (struct PendingMessage));
+ pending_message->msg = &confirm_message->header;
+
+ add_pending_message (active_client, pending_message);
}
+/**
+ * Handler for any generic DHT messages, calls the appropriate handler
+ * depending on message type, sends confirmation if responses aren't otherwise
+ * expected.
+ *
+ * @param cls closure for the service
+ * @param client the client we received this message from
+ * @param message the actual message received
+ */
static void
handle_dht_start_message (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
struct GNUNET_DHT_Message *dht_msg = (struct GNUNET_DHT_Message *) message;
struct GNUNET_MessageHeader *enc_msg;
struct DHT_MessageContext *message_context;
+
size_t enc_type;
enc_msg = (struct GNUNET_MessageHeader *) &dht_msg[1];
#endif
message_context = GNUNET_malloc (sizeof (struct DHT_MessageContext));
- message_context->client = client;
+ message_context->client = find_active_client (client);
message_context->key = &dht_msg->key;
message_context->unique_id = GNUNET_ntohll (dht_msg->unique_id);
message_context->replication = ntohs (dht_msg->desired_replication_level);
}
-
+/**
+ * Handler for any generic DHT stop messages, calls the appropriate handler
+ * depending on message type, sends confirmation by default (stop messages
+ * do not otherwise expect replies)
+ *
+ * @param cls closure for the service
+ * @param client the client we received this message from
+ * @param message the actual message received
+ *
+ * TODO: add demultiplexing for stop message types.
+ */
static void
handle_dht_stop_message (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
return GNUNET_YES;
}
+
+/**
+ * Receive the HELLO from transport service,
+ * free current and replace if necessary.
+ *
+ * @param cls NULL
+ * @param message HELLO message of peer
+ */
+static void
+process_hello (void *cls, const struct GNUNET_MessageHeader *message)
+{
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received our `%s' from transport service\n",
+ "HELLO");
+#endif
+
+ GNUNET_assert (message != NULL);
+ GNUNET_free_non_null(my_hello);
+ my_hello = GNUNET_malloc(ntohs(message->size));
+ memcpy(my_hello, message, ntohs(message->size));
+}
+
/**
* Task run during shutdown.
*
static void
shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- GNUNET_CORE_disconnect (coreAPI);
+ if (transport_handle != NULL)
+ {
+ GNUNET_free_non_null(my_hello);
+ GNUNET_TRANSPORT_get_hello_cancel(transport_handle, &process_hello, NULL);
+ GNUNET_TRANSPORT_disconnect(transport_handle);
+ }
+ if (coreAPI != NULL)
+ GNUNET_CORE_disconnect (coreAPI);
}
+
/**
* To be called on core init/fail.
+ *
+ * @param cls service closure
+ * @param server handle to the server for this service
+ * @param identity the public identity of this peer
+ * @param publicKey the public key of this peer
*/
void
core_init (void *cls,
if (server == NULL)
{
+#if DEBUG_DHT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "%s: Connection to core FAILED!\n", "dht",
+ GNUNET_i2s (identity));
+#endif
GNUNET_SCHEDULER_cancel (sched, cleanup_task);
GNUNET_SCHEDULER_add_now (sched, &shutdown_task, NULL);
return;
"%s: Core connection initialized, I am peer: %s\n", "dht",
GNUNET_i2s (identity));
#endif
+ /* Copy our identity so we can use it */
memcpy (&my_identity, identity, sizeof (struct GNUNET_PeerIdentity));
+ /* Set the server to local variable */
coreAPI = server;
}
+
/**
* Process dht requests.
*
GNUNET_NO, /* For header only outbound notification */
core_handlers); /* Register these handlers */
+ transport_handle = GNUNET_TRANSPORT_connect(sched, cfg, NULL, NULL, NULL, NULL);
+
+ if (transport_handle != NULL)
+ GNUNET_TRANSPORT_get_hello (transport_handle, &process_hello, NULL);
+ else
+ GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Failed to connect to transport service!\n");
+
+
if (coreAPI == NULL)
return;
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