/*
This file is part of GNUnet.
- (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
#include "gnunet_dht_service.h"
#include "dht.h"
-#define DEBUG_DHT_API GNUNET_EXTRA_LOGGING
+#define LOG(kind,...) GNUNET_log_from (kind, "dht-api",__VA_ARGS__)
/**
* Entry in our list of messages to be (re-)transmitted.
*/
void *cont_cls;
- /**
- * Timeout task for this message
- */
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
-
/**
* Unique ID for this request
*/
};
+#if ENABLE_MALICIOUS
+/**
+ * Handle to act malicious message
+ */
+struct GNUNET_DHT_ActMaliciousHandle
+{
+ /**
+ * Continuation to call when done.
+ */
+ GNUNET_DHT_ActMaliciousContinuation cont;
+
+ /**
+ * Main handle to this DHT api
+ */
+ struct GNUNET_DHT_Handle *dht_handle;
+
+ /**
+ * Closure for 'cont'.
+ */
+ void *cont_cls;
+};
+#endif
+
+/**
+ * Handle to a PUT request.
+ */
+struct GNUNET_DHT_PutHandle
+{
+ /**
+ * Kept in a DLL.
+ */
+ struct GNUNET_DHT_PutHandle *next;
+
+ /**
+ * Kept in a DLL.
+ */
+ struct GNUNET_DHT_PutHandle *prev;
+
+ /**
+ * Continuation to call when done.
+ */
+ GNUNET_DHT_PutContinuation cont;
+
+ /**
+ * Pending message associated with this PUT operation,
+ * NULL after the message has been transmitted to the service.
+ */
+ struct PendingMessage *pending;
+
+ /**
+ * Main handle to this DHT api
+ */
+ struct GNUNET_DHT_Handle *dht_handle;
+
+ /**
+ * Closure for 'cont'.
+ */
+ void *cont_cls;
+
+ /**
+ * Timeout task for this operation.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
+
+ /**
+ * Unique ID for the PUT operation.
+ */
+ uint64_t unique_id;
+
+};
/**
* Handle to a GET request
*/
struct PendingMessage *message;
+ /**
+ * Array of hash codes over the results that we have already
+ * seen.
+ */
+ struct GNUNET_HashCode *seen_results;
+
/**
* Key that this get request is for
*/
- GNUNET_HashCode key;
+ struct GNUNET_HashCode key;
/**
* Unique identifier for this request (for key collisions).
*/
uint64_t unique_id;
+ /**
+ * Size of the 'seen_results' array. Note that not
+ * all positions might be used (as we over-allocate).
+ */
+ unsigned int seen_results_size;
+
+ /**
+ * Offset into the 'seen_results' array marking the
+ * end of the positions that are actually used.
+ */
+ unsigned int seen_results_end;
+
+ /**
+ * Offset into the 'seen_results' array marking the
+ * position up to where we've send the hash codes to
+ * the DHT for blocking (needed as we might not be
+ * able to send all hash codes at once).
+ */
+ unsigned int seen_results_transmission_offset;
+
+
+};
+
+
+/**
+ * Handle to a monitoring request.
+ */
+struct GNUNET_DHT_MonitorHandle
+{
+ /**
+ * DLL.
+ */
+ struct GNUNET_DHT_MonitorHandle *next;
+
+ /**
+ * DLL.
+ */
+ struct GNUNET_DHT_MonitorHandle *prev;
+
+ /**
+ * Main handle to this DHT api.
+ */
+ struct GNUNET_DHT_Handle *dht_handle;
+
+ /**
+ * Type of block looked for.
+ */
+ enum GNUNET_BLOCK_Type type;
+
+ /**
+ * Key being looked for, NULL == all.
+ */
+ struct GNUNET_HashCode *key;
+
+ /**
+ * Callback for each received message of type get.
+ */
+ GNUNET_DHT_MonitorGetCB get_cb;
+
+ /**
+ * Callback for each received message of type get response.
+ */
+ GNUNET_DHT_MonitorGetRespCB get_resp_cb;
+
+ /**
+ * Callback for each received message of type put.
+ */
+ GNUNET_DHT_MonitorPutCB put_cb;
+
+ /**
+ * Closure for cb.
+ */
+ void *cb_cls;
+
};
struct PendingMessage *pending_tail;
/**
- * Hash map containing the current outstanding unique requests
- * (values are of type 'struct GNUNET_DHT_RouteHandle').
+ * Head of linked list of messages we would like to monitor.
+ */
+ struct GNUNET_DHT_MonitorHandle *monitor_head;
+
+ /**
+ * Tail of linked list of messages we would like to monitor.
+ */
+ struct GNUNET_DHT_MonitorHandle *monitor_tail;
+
+ /**
+ * Head of active PUT requests.
+ */
+ struct GNUNET_DHT_PutHandle *put_head;
+
+ /**
+ * Tail of active PUT requests.
+ */
+ struct GNUNET_DHT_PutHandle *put_tail;
+
+ /**
+ * Hash map containing the current outstanding unique GET requests
+ * (values are of type `struct GNUNET_DHT_GetHandle`).
*/
struct GNUNET_CONTAINER_MultiHashMap *active_requests;
*/
uint64_t uid_gen;
+ /**
+ * Did we start our receive loop yet?
+ */
+ int in_receive;
+
+#if ENABLE_MALICIOUS
+ /**
+ * Handle of act malicious request.
+ */
+ struct GNUNET_DHT_ActMaliciousHandle *mh;
+#endif
};
* Handler for messages received from the DHT service
* a demultiplexer which handles numerous message types
*
+ * @param cls the `struct GNUNET_DHT_Handle`
+ * @param msg the incoming message
*/
static void
-service_message_handler (void *cls, const struct GNUNET_MessageHeader *msg);
+service_message_handler (void *cls,
+ const struct GNUNET_MessageHeader *msg);
/**
* Try to (re)connect to the DHT service.
*
- * @return GNUNET_YES on success, GNUNET_NO on failure.
+ * @param handle DHT handle to reconnect
+ * @return #GNUNET_YES on success, #GNUNET_NO on failure.
*/
static int
try_connect (struct GNUNET_DHT_Handle *handle)
{
- if (handle->client != NULL)
+ if (NULL != handle->client)
return GNUNET_OK;
+ handle->in_receive = GNUNET_NO;
handle->client = GNUNET_CLIENT_connect ("dht", handle->cfg);
- if (handle->client == NULL)
+ if (NULL == handle->client)
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to connect to the DHT service!\n"));
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to connect to the DHT service!\n"));
return GNUNET_NO;
}
-#if DEBUG_DHT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Starting to process replies from DHT\n");
-#endif
- GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
- GNUNET_TIME_UNIT_FOREVER_REL);
return GNUNET_YES;
}
+/**
+ * Queue messages to DHT to block certain results from the result set.
+ *
+ * @param get_handle GET to generate messages for.
+ */
+static void
+queue_filter_messages (struct GNUNET_DHT_GetHandle *get_handle)
+{
+ struct PendingMessage *pm;
+ struct GNUNET_DHT_ClientGetResultSeenMessage *msg;
+ uint16_t msize;
+ unsigned int delta;
+ unsigned int max;
+
+ while (get_handle->seen_results_transmission_offset < get_handle->seen_results_end)
+ {
+ delta = get_handle->seen_results_end - get_handle->seen_results_transmission_offset;
+ max = (GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage)) / sizeof (struct GNUNET_HashCode);
+ if (delta > max)
+ delta = max;
+ msize = sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage) + delta * sizeof (struct GNUNET_HashCode);
+
+ pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
+ msg = (struct GNUNET_DHT_ClientGetResultSeenMessage *) &pm[1];
+ pm->msg = &msg->header;
+ pm->handle = get_handle->dht_handle;
+ pm->unique_id = get_handle->unique_id;
+ pm->free_on_send = GNUNET_YES;
+ pm->in_pending_queue = GNUNET_YES;
+ msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN);
+ msg->header.size = htons (msize);
+ msg->key = get_handle->key;
+ msg->unique_id = get_handle->unique_id;
+ memcpy (&msg[1],
+ &get_handle->seen_results[get_handle->seen_results_transmission_offset],
+ sizeof (struct GNUNET_HashCode) * delta);
+ get_handle->seen_results_transmission_offset += delta;
+ GNUNET_CONTAINER_DLL_insert_tail (get_handle->dht_handle->pending_head,
+ get_handle->dht_handle->pending_tail,
+ pm);
+ }
+}
+
+
/**
* Add the request corresponding to the given route handle
* to the pending queue (if it is not already in there).
*
- * @param cls the 'struct GNUNET_DHT_Handle*'
+ * @param cls the `struct GNUNET_DHT_Handle *`
* @param key key for the request (not used)
- * @param value the 'struct GNUNET_DHT_GetHandle*'
- * @return GNUNET_YES (always)
+ * @param value the `struct GNUNET_DHT_GetHandle *`
+ * @return #GNUNET_YES (always)
*/
static int
-add_request_to_pending (void *cls, const GNUNET_HashCode * key, void *value)
+add_request_to_pending (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
struct GNUNET_DHT_Handle *handle = cls;
- struct GNUNET_DHT_GetHandle *rh = value;
+ struct GNUNET_DHT_GetHandle *get_handle = value;
- if (GNUNET_NO == rh->message->in_pending_queue)
+ if (GNUNET_NO == get_handle->message->in_pending_queue)
{
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Retransmitting request related to %s to DHT %p\n", GNUNET_h2s (key),
+ handle);
+ get_handle->seen_results_transmission_offset = 0;
GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
- rh->message);
- rh->message->in_pending_queue = GNUNET_YES;
+ get_handle->message);
+ queue_filter_messages (get_handle);
+ get_handle->message->in_pending_queue = GNUNET_YES;
}
return GNUNET_YES;
}
/**
* Try to send messages from list of messages to send
+ *
* @param handle DHT_Handle
*/
static void
/**
* Try reconnecting to the dht service.
*
- * @param cls GNUNET_DHT_Handle
+ * @param cls a `struct GNUNET_DHT_Handle`
* @param tc scheduler context
*/
static void
-try_reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+try_reconnect (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_DHT_Handle *handle = cls;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Reconnecting with DHT %p\n", handle);
+ handle->retry_time = GNUNET_TIME_STD_BACKOFF (handle->retry_time);
handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if (handle->retry_time.rel_value < GNUNET_CONSTANTS_SERVICE_RETRY.rel_value)
- handle->retry_time = GNUNET_CONSTANTS_SERVICE_RETRY;
- else
- handle->retry_time = GNUNET_TIME_relative_multiply (handle->retry_time, 2);
- if (handle->retry_time.rel_value > GNUNET_CONSTANTS_SERVICE_TIMEOUT.rel_value)
- handle->retry_time = GNUNET_CONSTANTS_SERVICE_TIMEOUT;
- handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- handle->client = GNUNET_CLIENT_connect ("dht", handle->cfg);
- if (handle->client == NULL)
+ if (GNUNET_YES != try_connect (handle))
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "dht reconnect failed(!)\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "dht reconnect failed(!)\n");
return;
}
GNUNET_CONTAINER_multihashmap_iterate (handle->active_requests,
static void
do_disconnect (struct GNUNET_DHT_Handle *handle)
{
- if (handle->client == NULL)
+ struct GNUNET_DHT_PutHandle *ph;
+ struct GNUNET_DHT_PutHandle *next;
+
+ if (NULL == handle->client)
return;
- GNUNET_assert (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == handle->reconnect_task);
if (NULL != handle->th)
- GNUNET_CLIENT_notify_transmit_ready_cancel(handle->th);
+ GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
handle->th = NULL;
- GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting from DHT service, will try to reconnect in %s\n",
+ GNUNET_STRINGS_relative_time_to_string (handle->retry_time,
+ GNUNET_YES));
+ GNUNET_CLIENT_disconnect (handle->client);
handle->client = NULL;
+
+ /* signal disconnect to all PUT requests that were transmitted but waiting
+ for the put confirmation */
+ next = handle->put_head;
+ while (NULL != (ph = next))
+ {
+ next = ph->next;
+ if (NULL == ph->pending)
+ {
+ if (NULL != ph->cont)
+ ph->cont (ph->cont_cls, GNUNET_SYSERR);
+ GNUNET_DHT_put_cancel (ph);
+ }
+ }
handle->reconnect_task =
GNUNET_SCHEDULER_add_delayed (handle->retry_time, &try_reconnect, handle);
}
/**
* Transmit the next pending message, called by notify_transmit_ready
+ *
+ * @param cls the DHT handle
+ * @param size number of bytes available in @a buf for transmission
+ * @param buf where to copy messages for the service
+ * @return number of bytes written to @a buf
*/
static size_t
-transmit_pending (void *cls, size_t size, void *buf);
+transmit_pending (void *cls,
+ size_t size,
+ void *buf);
/**
* Try to send messages from list of messages to send
+ *
+ * @param handle handle to DHT
*/
static void
process_pending_messages (struct GNUNET_DHT_Handle *handle)
{
struct PendingMessage *head;
- if (handle->client == NULL)
+ if (NULL == handle->client)
{
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "process_pending_messages called, but client is NULL, reconnecting\n");
do_disconnect (handle);
return;
}
- if (handle->th != NULL)
+ if (NULL != handle->th)
return;
if (NULL == (head = handle->pending_head))
return;
handle);
if (NULL != handle->th)
return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "notify_transmit_ready returned NULL, reconnecting\n");
do_disconnect (handle);
}
/**
* Transmit the next pending message, called by notify_transmit_ready
+ *
+ * @param cls the DHT handle
+ * @param size number of bytes available in @a buf for transmission
+ * @param buf where to copy messages for the service
+ * @return number of bytes written to @a buf
*/
static size_t
-transmit_pending (void *cls, size_t size, void *buf)
+transmit_pending (void *cls,
+ size_t size,
+ void *buf)
{
struct GNUNET_DHT_Handle *handle = cls;
struct PendingMessage *head;
size_t tsize;
+
handle->th = NULL;
- if (buf == NULL)
+ if (NULL == buf)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission to DHT service failed! Reconnecting!\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission to DHT service failed! Reconnecting!\n");
do_disconnect (handle);
return 0;
}
memcpy (buf, head->msg, tsize);
GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
head);
- if (head->timeout_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (head->timeout_task);
- head->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
+ head->in_pending_queue = GNUNET_NO;
if (NULL != head->cont)
{
- GNUNET_SCHEDULER_add_continuation (head->cont, head->cont_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+ head->cont (head->cont_cls, NULL);
head->cont = NULL;
head->cont_cls = NULL;
}
- head->in_pending_queue = GNUNET_NO;
if (GNUNET_YES == head->free_on_send)
GNUNET_free (head);
process_pending_messages (handle);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarded request of %u bytes to DHT service\n",
- (unsigned int) tsize);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Forwarded request of %u bytes to DHT service\n", (unsigned int) tsize);
+ if (GNUNET_NO == handle->in_receive)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting to process replies from DHT\n");
+ handle->in_receive = GNUNET_YES;
+
+ GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ }
return tsize;
}
* Process a given reply that might match the given
* request.
*
- * @param cls the 'struct GNUNET_DHT_ClientResultMessage'
+ * @param cls the `struct GNUNET_DHT_ClientResultMessage`
* @param key query of the request
- * @param value the 'struct GNUNET_DHT_RouteHandle' of a request matching the same key
- * @return GNUNET_YES to continue to iterate over all results,
- * GNUNET_NO if the reply is malformed
+ * @param value the `struct GNUNET_DHT_RouteHandle` of a request matching the same key
+ * @return #GNUNET_YES to continue to iterate over all results,
+ * #GNUNET_NO if the reply is malformed or we found a matching request
*/
static int
-process_reply (void *cls, const GNUNET_HashCode * key, void *value)
+process_reply (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
const struct GNUNET_DHT_ClientResultMessage *dht_msg = cls;
struct GNUNET_DHT_GetHandle *get_handle = value;
const struct GNUNET_PeerIdentity *put_path;
const struct GNUNET_PeerIdentity *get_path;
+ struct GNUNET_HashCode hc;
uint32_t put_path_length;
uint32_t get_path_length;
size_t data_length;
if (dht_msg->unique_id != get_handle->unique_id)
{
/* UID mismatch */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Ignoring reply (UID mismatch: %llu/%llu)\n",
- dht_msg->unique_id,
- get_handle->unique_id);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Ignoring reply for %s: UID mismatch: %llu/%llu\n", GNUNET_h2s (key),
+ dht_msg->unique_id, get_handle->unique_id);
return GNUNET_YES;
}
msize = ntohs (dht_msg->header.size);
put_path_length = ntohl (dht_msg->put_path_length);
get_path_length = ntohl (dht_msg->get_path_length);
- meta_length = sizeof (struct GNUNET_DHT_ClientResultMessage) +
- sizeof (struct GNUNET_PeerIdentity) * (get_path_length + put_path_length);
- if ( (msize < meta_length) ||
- (get_path_length > GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
- (put_path_length > GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) )
- {
- GNUNET_break (0);
- return GNUNET_NO;
- }
- data_length = msize - meta_length;
+ meta_length =
+ sizeof (struct GNUNET_DHT_ClientResultMessage) +
+ sizeof (struct GNUNET_PeerIdentity) * (get_path_length + put_path_length);
+ if ((msize < meta_length) ||
+ (get_path_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)) ||
+ (put_path_length >
+ GNUNET_SERVER_MAX_MESSAGE_SIZE / sizeof (struct GNUNET_PeerIdentity)))
+ {
+ GNUNET_break (0);
+ return GNUNET_NO;
+ }
+ data_length = msize - meta_length;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Giving %u byte reply for %s to application\n",
+ (unsigned int) data_length, GNUNET_h2s (key));
put_path = (const struct GNUNET_PeerIdentity *) &dht_msg[1];
get_path = &put_path[put_path_length];
data = &get_path[get_path_length];
+ /* remember that we've seen this result */
+ GNUNET_CRYPTO_hash (data, data_length, &hc);
+ if (get_handle->seen_results_size == get_handle->seen_results_end)
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_size,
+ get_handle->seen_results_size * 2 + 1);
+ GNUNET_assert (get_handle->seen_results_end == get_handle->seen_results_transmission_offset);
+ get_handle->seen_results[get_handle->seen_results_end++] = hc;
+ /* no need to block it explicitly, service already knows about it! */
+ get_handle->seen_results_transmission_offset++;
get_handle->iter (get_handle->iter_cls,
- GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
- key,
- get_path, get_path_length,
- put_path, put_path_length,
- ntohl (dht_msg->type),
- data_length, data);
- return GNUNET_YES;
+ GNUNET_TIME_absolute_ntoh (dht_msg->expiration), key,
+ get_path, get_path_length, put_path, put_path_length,
+ ntohl (dht_msg->type), data_length, data);
+ return GNUNET_NO;
+}
+
+
+/**
+ * Process a get monitor message from the service.
+ *
+ * @param handle The DHT handle.
+ * @param msg Monitor get message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+process_monitor_get_message (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_DHT_MonitorGetMessage *msg)
+{
+ struct GNUNET_DHT_MonitorHandle *h;
+
+ for (h = handle->monitor_head; NULL != h; h = h->next)
+ {
+ int type_ok;
+ int key_ok;
+
+ type_ok = (GNUNET_BLOCK_TYPE_ANY == h->type) || (h->type == ntohl(msg->type));
+ key_ok = (NULL == h->key) || (0 == memcmp (h->key, &msg->key,
+ sizeof (struct GNUNET_HashCode)));
+ if (type_ok && key_ok && (NULL != h->get_cb))
+ h->get_cb (h->cb_cls,
+ ntohl (msg->options),
+ (enum GNUNET_BLOCK_Type) ntohl(msg->type),
+ ntohl (msg->hop_count),
+ ntohl (msg->desired_replication_level),
+ ntohl (msg->get_path_length),
+ (struct GNUNET_PeerIdentity *) &msg[1],
+ &msg->key);
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a get response monitor message from the service.
+ *
+ * @param handle The DHT handle.
+ * @param msg monitor get response message from the service
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+process_monitor_get_resp_message (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_DHT_MonitorGetRespMessage *msg)
+{
+ struct GNUNET_DHT_MonitorHandle *h;
+ struct GNUNET_PeerIdentity *path;
+ uint32_t getl;
+ uint32_t putl;
+ size_t msize;
+
+ msize = ntohs (msg->header.size);
+ path = (struct GNUNET_PeerIdentity *) &msg[1];
+ getl = ntohl (msg->get_path_length);
+ putl = ntohl (msg->put_path_length);
+ if ( (getl + putl < getl) ||
+ ( ((msize - sizeof (struct GNUNET_DHT_MonitorGetRespMessage)) / sizeof (struct GNUNET_PeerIdentity)) < getl + putl) )
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ for (h = handle->monitor_head; NULL != h; h = h->next)
+ {
+ int type_ok;
+ int key_ok;
+
+ type_ok = (GNUNET_BLOCK_TYPE_ANY == h->type) || (h->type == ntohl(msg->type));
+ key_ok = (NULL == h->key) || (0 == memcmp (h->key, &msg->key,
+ sizeof (struct GNUNET_HashCode)));
+ if (type_ok && key_ok && (NULL != h->get_resp_cb))
+ h->get_resp_cb (h->cb_cls,
+ (enum GNUNET_BLOCK_Type) ntohl(msg->type),
+ path, getl,
+ &path[getl], putl,
+ GNUNET_TIME_absolute_ntoh(msg->expiration_time),
+ &msg->key,
+ (void *) &path[getl + putl],
+ msize -
+ sizeof (struct GNUNET_DHT_MonitorGetRespMessage) -
+ sizeof (struct GNUNET_PeerIdentity) * (putl + getl));
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Process a put monitor message from the service.
+ *
+ * @param handle The DHT handle.
+ * @param msg Monitor put message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+process_monitor_put_message (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_DHT_MonitorPutMessage *msg)
+{
+ struct GNUNET_DHT_MonitorHandle *h;
+ size_t msize;
+ struct GNUNET_PeerIdentity *path;
+ uint32_t putl;
+
+ msize = ntohs (msg->header.size);
+ path = (struct GNUNET_PeerIdentity *) &msg[1];
+ putl = ntohl (msg->put_path_length);
+ if (((msize - sizeof (struct GNUNET_DHT_MonitorGetRespMessage)) / sizeof (struct GNUNET_PeerIdentity)) < putl)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ for (h = handle->monitor_head; NULL != h; h = h->next)
+ {
+ int type_ok;
+ int key_ok;
+
+ type_ok = (GNUNET_BLOCK_TYPE_ANY == h->type) || (h->type == ntohl(msg->type));
+ key_ok = (NULL == h->key) || (0 == memcmp (h->key, &msg->key,
+ sizeof (struct GNUNET_HashCode)));
+ if (type_ok && key_ok && (NULL != h->put_cb))
+ h->put_cb (h->cb_cls,
+ ntohl (msg->options),
+ (enum GNUNET_BLOCK_Type) ntohl(msg->type),
+ ntohl (msg->hop_count),
+ ntohl (msg->desired_replication_level),
+ putl, path,
+ GNUNET_TIME_absolute_ntoh(msg->expiration_time),
+ &msg->key,
+ (void *) &path[putl],
+ msize -
+ sizeof (struct GNUNET_DHT_MonitorPutMessage) -
+ sizeof (struct GNUNET_PeerIdentity) * putl);
+ }
+ return GNUNET_OK;
+}
+
+
+#if ENABLE_MALICIOUS
+/**
+ * Process a act malicious confirmation from service.
+ * @param handle The DHT handle.
+ * @param msg confirmation message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+process_act_malicious_confirmation_message (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_DHT_ClientActMaliciousConfirmationMessage *msg)
+{
+ struct GNUNET_DHT_ActMaliciousHandle *mh;
+ GNUNET_DHT_PutContinuation cont;
+ void *cont_cls;
+
+ mh = handle->mh;
+ if (NULL == mh)
+ return GNUNET_OK;
+ cont = mh->cont;
+ cont_cls = mh->cont_cls;
+ if (NULL != cont)
+ cont (cont_cls, GNUNET_OK);
+
+ return GNUNET_OK;
+}
+#endif
+
+
+/**
+ * Process a put confirmation message from the service.
+ *
+ * @param handle The DHT handle.
+ * @param msg confirmation message from the service.
+ * @return #GNUNET_OK if everything went fine,
+ * #GNUNET_SYSERR if the message is malformed.
+ */
+static int
+process_put_confirmation_message (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_DHT_ClientPutConfirmationMessage *msg)
+{
+ struct GNUNET_DHT_PutHandle *ph;
+ GNUNET_DHT_PutContinuation cont;
+ void *cont_cls;
+
+ for (ph = handle->put_head; NULL != ph; ph = ph->next)
+ if (ph->unique_id == msg->unique_id)
+ break;
+ if (NULL == ph)
+ return GNUNET_OK;
+ cont = ph->cont;
+ cont_cls = ph->cont_cls;
+ GNUNET_DHT_put_cancel (ph);
+ if (NULL != cont)
+ cont (cont_cls, GNUNET_OK);
+ return GNUNET_OK;
}
* Handler for messages received from the DHT service
* a demultiplexer which handles numerous message types
*
- * @param cls the 'struct GNUNET_DHT_Handle'
+ * @param cls the `struct GNUNET_DHT_Handle`
* @param msg the incoming message
*/
static void
{
struct GNUNET_DHT_Handle *handle = cls;
const struct GNUNET_DHT_ClientResultMessage *dht_msg;
+ uint16_t msize;
+ int ret;
- if (msg == NULL)
+
+ if (NULL == msg)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Error receiving data from DHT service, reconnecting\n");
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Error receiving data from DHT service, reconnecting\n");
do_disconnect (handle);
return;
}
- if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT)
+ GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ ret = GNUNET_SYSERR;
+ msize = ntohs (msg->size);
+ switch (ntohs (msg->type))
{
- GNUNET_break (0);
- do_disconnect (handle);
- return;
+ case GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET:
+ if (msize < sizeof (struct GNUNET_DHT_MonitorGetMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ ret = process_monitor_get_message(handle,
+ (const struct GNUNET_DHT_MonitorGetMessage *) msg);
+ break;
+ case GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP:
+ if (msize < sizeof (struct GNUNET_DHT_MonitorGetRespMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ ret = process_monitor_get_resp_message(handle,
+ (const struct GNUNET_DHT_MonitorGetRespMessage *) msg);
+ break;
+ case GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT:
+ if (msize < sizeof (struct GNUNET_DHT_MonitorPutMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ ret = process_monitor_put_message(handle,
+ (const struct GNUNET_DHT_MonitorPutMessage *) msg);
+ break;
+ case GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT_RESP:
+ /* Not implemented yet */
+ GNUNET_break(0);
+ break;
+ case GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT:
+ if (ntohs (msg->size) < sizeof (struct GNUNET_DHT_ClientResultMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ dht_msg = (const struct GNUNET_DHT_ClientResultMessage *) msg;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received reply for `%s' from DHT service %p\n",
+ GNUNET_h2s (&dht_msg->key), handle);
+ GNUNET_CONTAINER_multihashmap_get_multiple (handle->active_requests,
+ &dht_msg->key,
+ &process_reply,
+ (void *) dht_msg);
+ ret = GNUNET_OK;
+ break;
+ case GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT_OK:
+ if (ntohs (msg->size) != sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ ret = process_put_confirmation_message (handle,
+ (const struct GNUNET_DHT_ClientPutConfirmationMessage*) msg);
+ break;
+#if ENABLE_MALICIOUS
+ case GNUNET_MESSAGE_TYPE_DHT_CLIENT_ACT_MALICIOUS_OK:
+ if(msize != sizeof (struct GNUNET_DHT_ClientActMaliciousConfirmationMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ ret = process_act_malicious_confirmation_message (handle,
+ (const struct GNUNET_DHT_ClientActMaliciousConfirmationMessage*) msg);
+ break;
+#endif
+ default:
+ GNUNET_break(0);
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "Unknown DHT message type: %hu (%hu) size: %hu\n",
+ ntohs (msg->type), msg->type, msize);
+ break;
}
- if (ntohs (msg->size) < sizeof (struct GNUNET_DHT_ClientResultMessage))
+ if (GNUNET_OK != ret)
{
GNUNET_break (0);
do_disconnect (handle);
return;
}
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received reply from DHT service\n");
- dht_msg = (const struct GNUNET_DHT_ClientResultMessage *) msg;
- GNUNET_CONTAINER_multihashmap_get_multiple (handle->active_requests,
- &dht_msg->key, &process_reply,
- (void *) dht_msg);
- GNUNET_CLIENT_receive (handle->client, &service_message_handler, handle,
- GNUNET_TIME_UNIT_FOREVER_REL);
}
* @param cfg configuration to use
* @param ht_len size of the internal hash table to use for
* processing multiple GET/FIND requests in parallel
- *
* @return handle to the DHT service, or NULL on error
*/
struct GNUNET_DHT_Handle *
{
struct GNUNET_DHT_Handle *handle;
- handle = GNUNET_malloc (sizeof (struct GNUNET_DHT_Handle));
+ handle = GNUNET_new (struct GNUNET_DHT_Handle);
handle->cfg = cfg;
handle->uid_gen =
GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
- handle->active_requests = GNUNET_CONTAINER_multihashmap_create (ht_len);
+ handle->active_requests = GNUNET_CONTAINER_multihashmap_create (ht_len, GNUNET_YES);
if (GNUNET_NO == try_connect (handle))
{
GNUNET_DHT_disconnect (handle);
GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle)
{
struct PendingMessage *pm;
+ struct GNUNET_DHT_PutHandle *ph;
- GNUNET_assert (handle != NULL);
+ GNUNET_assert (NULL != handle);
GNUNET_assert (0 ==
GNUNET_CONTAINER_multihashmap_size (handle->active_requests));
- if (handle->th != NULL)
+ if (NULL != handle->th)
{
GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
handle->th = NULL;
}
while (NULL != (pm = handle->pending_head))
{
+ GNUNET_assert (GNUNET_YES == pm->in_pending_queue);
GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
pm);
+ pm->in_pending_queue = GNUNET_NO;
GNUNET_assert (GNUNET_YES == pm->free_on_send);
- if (GNUNET_SCHEDULER_NO_TASK != pm->timeout_task)
- GNUNET_SCHEDULER_cancel (pm->timeout_task);
if (NULL != pm->cont)
- GNUNET_SCHEDULER_add_continuation (pm->cont, pm->cont_cls,
- GNUNET_SCHEDULER_REASON_TIMEOUT);
- pm->in_pending_queue = GNUNET_NO;
+ pm->cont (pm->cont_cls, NULL);
GNUNET_free (pm);
}
- if (handle->client != NULL)
+ while (NULL != (ph = handle->put_head))
{
- GNUNET_CLIENT_disconnect (handle->client, GNUNET_YES);
+ GNUNET_break (NULL == ph->pending);
+ if (NULL != ph->cont)
+ ph->cont (ph->cont_cls, GNUNET_SYSERR);
+ GNUNET_DHT_put_cancel (ph);
+ }
+
+ if (NULL != handle->client)
+ {
+ GNUNET_CLIENT_disconnect (handle->client);
handle->client = NULL;
}
- if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
+ if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
GNUNET_SCHEDULER_cancel (handle->reconnect_task);
GNUNET_CONTAINER_multihashmap_destroy (handle->active_requests);
GNUNET_free (handle);
/**
* Timeout for the transmission of a fire&forget-request. Clean it up.
*
- * @param cls the 'struct PendingMessage'
+ * @param cls the `struct GNUNET_DHT_PutHandle *`
* @param tc scheduler context
*/
static void
-timeout_put_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+timeout_put_request (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct PendingMessage *pending = cls;
- struct GNUNET_DHT_Handle *handle;
+ struct GNUNET_DHT_PutHandle *ph = cls;
+ struct GNUNET_DHT_Handle *handle = ph->dht_handle;
- handle = pending->handle;
- GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
- pending);
- if (pending->cont != NULL)
- pending->cont (pending->cont_cls, tc);
- GNUNET_free (pending);
+ ph->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ if (NULL != ph->pending)
+ {
+ GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
+ ph->pending);
+ ph->pending->in_pending_queue = GNUNET_NO;
+ GNUNET_free (ph->pending);
+ }
+ if (NULL != ph->cont)
+ ph->cont (ph->cont_cls, GNUNET_NO);
+ GNUNET_CONTAINER_DLL_remove (handle->put_head,
+ handle->put_tail,
+ ph);
+ GNUNET_free (ph);
+}
+
+
+/**
+ * Function called whenever the PUT message leaves the queue. Sets
+ * the message pointer in the put handle to NULL.
+ *
+ * @param cls the `struct GNUNET_DHT_PutHandle`
+ * @param tc unused
+ */
+static void
+mark_put_message_gone (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_DHT_PutHandle *ph = cls;
+
+ ph->pending = NULL;
}
/**
- * Perform a PUT operation storing data in the DHT.
+ * Perform a PUT operation storing data in the DHT. FIXME: we should
+ * change the protocol to get a confirmation for the PUT from the DHT
+ * and call 'cont' only after getting the confirmation; otherwise, the
+ * client has no good way of telling if the 'PUT' message actually got
+ * to the DHT service!
*
* @param handle handle to DHT service
* @param key the key to store under
* @param exp desired expiration time for the value
* @param timeout how long to wait for transmission of this request
* @param cont continuation to call when done (transmitting request to service)
- * @param cont_cls closure for cont
+ * You must not call #GNUNET_DHT_disconnect in this continuation
+ * @param cont_cls closure for @a cont
*/
-void
-GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const GNUNET_HashCode * key,
+struct GNUNET_DHT_PutHandle *
+GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle,
+ const struct GNUNET_HashCode * key,
uint32_t desired_replication_level,
enum GNUNET_DHT_RouteOption options,
- enum GNUNET_BLOCK_Type type, size_t size, const char *data,
+ enum GNUNET_BLOCK_Type type, size_t size,
+ const void *data,
struct GNUNET_TIME_Absolute exp,
- struct GNUNET_TIME_Relative timeout, GNUNET_SCHEDULER_Task cont,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_DHT_PutContinuation cont,
void *cont_cls)
{
struct GNUNET_DHT_ClientPutMessage *put_msg;
size_t msize;
struct PendingMessage *pending;
+ struct GNUNET_DHT_PutHandle *ph;
msize = sizeof (struct GNUNET_DHT_ClientPutMessage) + size;
- if ( (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
- (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE) )
- {
- GNUNET_break (0);
- if (NULL != cont)
- cont (cont_cls, NULL);
- return;
- }
+ if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
+ (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ ph = GNUNET_new (struct GNUNET_DHT_PutHandle);
+ ph->dht_handle = handle;
+ ph->timeout_task = GNUNET_SCHEDULER_add_delayed (timeout, &timeout_put_request, ph);
+ ph->cont = cont;
+ ph->cont_cls = cont_cls;
+ ph->unique_id = ++handle->uid_gen;
pending = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
+ ph->pending = pending;
put_msg = (struct GNUNET_DHT_ClientPutMessage *) &pending[1];
pending->msg = &put_msg->header;
pending->handle = handle;
- pending->cont = cont;
- pending->cont_cls = cont_cls;
+ pending->cont = &mark_put_message_gone;
+ pending->cont_cls = ph;
pending->free_on_send = GNUNET_YES;
- pending->timeout_task =
- GNUNET_SCHEDULER_add_delayed (timeout, &timeout_put_request, pending);
put_msg->header.size = htons (msize);
put_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT);
put_msg->type = htonl (type);
put_msg->options = htonl ((uint32_t) options);
put_msg->desired_replication_level = htonl (desired_replication_level);
+ put_msg->unique_id = ph->unique_id;
put_msg->expiration = GNUNET_TIME_absolute_hton (exp);
put_msg->key = *key;
memcpy (&put_msg[1], data, size);
GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
pending);
pending->in_pending_queue = GNUNET_YES;
+ GNUNET_CONTAINER_DLL_insert_tail (handle->put_head,
+ handle->put_tail,
+ ph);
process_pending_messages (handle);
+ return ph;
+}
+
+
+/**
+ * Cancels a DHT PUT operation. Note that the PUT request may still
+ * go out over the network (we can't stop that); However, if the PUT
+ * has not yet been sent to the service, cancelling the PUT will stop
+ * this from happening (but there is no way for the user of this API
+ * to tell if that is the case). The only use for this API is to
+ * prevent a later call to 'cont' from #GNUNET_DHT_put (i.e. because
+ * the system is shutting down).
+ *
+ * @param ph put operation to cancel ('cont' will no longer be called)
+ */
+void
+GNUNET_DHT_put_cancel (struct GNUNET_DHT_PutHandle *ph)
+{
+ struct GNUNET_DHT_Handle *handle = ph->dht_handle;
+
+ if (NULL != ph->pending)
+ {
+ GNUNET_CONTAINER_DLL_remove (handle->pending_head,
+ handle->pending_tail,
+ ph->pending);
+ GNUNET_free (ph->pending);
+ ph->pending = NULL;
+ }
+ if (ph->timeout_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (ph->timeout_task);
+ ph->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_DLL_remove (handle->put_head,
+ handle->put_tail,
+ ph);
+ GNUNET_free (ph);
}
/**
* Perform an asynchronous GET operation on the DHT identified. See
- * also "GNUNET_BLOCK_evaluate".
+ * also #GNUNET_BLOCK_evaluate.
*
* @param handle handle to the DHT service
- * @param timeout how long to wait for transmission of this request to the service
* @param type expected type of the response object
* @param key the key to look up
* @param desired_replication_level estimate of how many
nearest peers this request should reach
* @param options routing options for this message
* @param xquery extended query data (can be NULL, depending on type)
- * @param xquery_size number of bytes in xquery
+ * @param xquery_size number of bytes in @a xquery
* @param iter function to call on each result
* @param iter_cls closure for iter
* @return handle to stop the async get
*/
struct GNUNET_DHT_GetHandle *
GNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle,
- struct GNUNET_TIME_Relative timeout,
- enum GNUNET_BLOCK_Type type, const GNUNET_HashCode * key,
+ enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode * key,
uint32_t desired_replication_level,
- enum GNUNET_DHT_RouteOption options,
- const void *xquery, size_t xquery_size,
- GNUNET_DHT_GetIterator iter, void *iter_cls)
+ enum GNUNET_DHT_RouteOption options, const void *xquery,
+ size_t xquery_size, GNUNET_DHT_GetIterator iter,
+ void *iter_cls)
{
struct GNUNET_DHT_ClientGetMessage *get_msg;
struct GNUNET_DHT_GetHandle *get_handle;
struct PendingMessage *pending;
msize = sizeof (struct GNUNET_DHT_ClientGetMessage) + xquery_size;
- if ( (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
- (xquery_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE) )
- {
- GNUNET_break (0);
- return NULL;
- }
+ if ((msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
+ (xquery_size >= GNUNET_SERVER_MAX_MESSAGE_SIZE))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending query for %s to DHT %p\n",
+ GNUNET_h2s (key), handle);
pending = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
get_msg = (struct GNUNET_DHT_ClientGetMessage *) &pending[1];
pending->msg = &get_msg->header;
get_msg->desired_replication_level = htonl (desired_replication_level);
get_msg->type = htonl (type);
get_msg->key = *key;
- handle->uid_gen++;
- get_msg->unique_id = handle->uid_gen;
+ get_msg->unique_id = ++handle->uid_gen;
memcpy (&get_msg[1], xquery, xquery_size);
GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
pending);
pending->in_pending_queue = GNUNET_YES;
- get_handle = GNUNET_malloc (sizeof (struct GNUNET_DHT_GetHandle));
+ get_handle = GNUNET_new (struct GNUNET_DHT_GetHandle);
+ get_handle->key = *key;
+ get_handle->dht_handle = handle;
get_handle->iter = iter;
get_handle->iter_cls = iter_cls;
- get_handle->message = pending;
+ get_handle->message = pending;
get_handle->unique_id = get_msg->unique_id;
GNUNET_CONTAINER_multihashmap_put (handle->active_requests,
- key, get_handle,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ &get_handle->key,
+ get_handle,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
process_pending_messages (handle);
return get_handle;
}
+/**
+ * Tell the DHT not to return any of the following known results
+ * to this client.
+ *
+ * @param get_handle get operation for which results should be filtered
+ * @param num_results number of results to be blocked that are
+ * provided in this call (size of the @a results array)
+ * @param results array of hash codes over the 'data' of the results
+ * to be blocked
+ */
+void
+GNUNET_DHT_get_filter_known_results (struct GNUNET_DHT_GetHandle *get_handle,
+ unsigned int num_results,
+ const struct GNUNET_HashCode *results)
+{
+ unsigned int needed;
+
+ needed = get_handle->seen_results_end + num_results;
+ if (needed > get_handle->seen_results_size)
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_size,
+ needed);
+ memcpy (&get_handle->seen_results[get_handle->seen_results_end],
+ results,
+ num_results * sizeof (struct GNUNET_HashCode));
+ get_handle->seen_results_end += num_results;
+ queue_filter_messages (get_handle);
+ process_pending_messages (get_handle->dht_handle);
+}
+
+
/**
* Stop async DHT-get.
*
struct PendingMessage *pending;
handle = get_handle->message->handle;
- get_msg = (const struct GNUNET_DHT_ClientGetMessage*) get_handle->message->msg;
-
+ get_msg =
+ (const struct GNUNET_DHT_ClientGetMessage *) get_handle->message->msg;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending STOP for %s to DHT via %p\n",
+ GNUNET_h2s (&get_msg->key), handle);
/* generate STOP */
- pending = GNUNET_malloc (sizeof (struct PendingMessage) + sizeof (struct GNUNET_DHT_ClientGetStopMessage));
+ pending =
+ GNUNET_malloc (sizeof (struct PendingMessage) +
+ sizeof (struct GNUNET_DHT_ClientGetStopMessage));
stop_msg = (struct GNUNET_DHT_ClientGetStopMessage *) &pending[1];
pending->msg = &stop_msg->header;
pending->handle = handle;
pending->free_on_send = GNUNET_YES;
- stop_msg->header.size = htons (sizeof (struct GNUNET_DHT_ClientGetStopMessage));
+ stop_msg->header.size =
+ htons (sizeof (struct GNUNET_DHT_ClientGetStopMessage));
stop_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP);
stop_msg->reserved = htonl (0);
stop_msg->unique_id = get_msg->unique_id;
/* remove 'GET' from active status */
GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (handle->active_requests,
- &get_msg->key, get_handle));
+ GNUNET_CONTAINER_multihashmap_remove (handle->active_requests,
+ &get_handle->key,
+ get_handle));
if (GNUNET_YES == get_handle->message->in_pending_queue)
- {
- GNUNET_CONTAINER_DLL_remove (handle->pending_head,
- handle->pending_tail,
- get_handle->message);
- get_handle->message->in_pending_queue = GNUNET_NO;
- }
+ {
+ GNUNET_CONTAINER_DLL_remove (handle->pending_head, handle->pending_tail,
+ get_handle->message);
+ get_handle->message->in_pending_queue = GNUNET_NO;
+ }
GNUNET_free (get_handle->message);
+ GNUNET_array_grow (get_handle->seen_results,
+ get_handle->seen_results_end,
+ 0);
GNUNET_free (get_handle);
+ process_pending_messages (handle);
+}
+
+
+/**
+ * Start monitoring the local DHT service.
+ *
+ * @param handle Handle to the DHT service.
+ * @param type Type of blocks that are of interest.
+ * @param key Key of data of interest, NULL for all.
+ * @param get_cb Callback to process monitored get messages.
+ * @param get_resp_cb Callback to process monitored get response messages.
+ * @param put_cb Callback to process monitored put messages.
+ * @param cb_cls Closure for callbacks.
+ * @return Handle to stop monitoring.
+ */
+struct GNUNET_DHT_MonitorHandle *
+GNUNET_DHT_monitor_start (struct GNUNET_DHT_Handle *handle,
+ enum GNUNET_BLOCK_Type type,
+ const struct GNUNET_HashCode *key,
+ GNUNET_DHT_MonitorGetCB get_cb,
+ GNUNET_DHT_MonitorGetRespCB get_resp_cb,
+ GNUNET_DHT_MonitorPutCB put_cb,
+ void *cb_cls)
+{
+ struct GNUNET_DHT_MonitorHandle *h;
+ struct GNUNET_DHT_MonitorStartStopMessage *m;
+ struct PendingMessage *pending;
+
+ h = GNUNET_new (struct GNUNET_DHT_MonitorHandle);
+ GNUNET_CONTAINER_DLL_insert(handle->monitor_head, handle->monitor_tail, h);
+
+ h->get_cb = get_cb;
+ h->get_resp_cb = get_resp_cb;
+ h->put_cb = put_cb;
+ h->cb_cls = cb_cls;
+ h->type = type;
+ h->dht_handle = handle;
+ if (NULL != key)
+ {
+ h->key = GNUNET_new (struct GNUNET_HashCode);
+ *h->key = *key;
+ }
+
+ pending = GNUNET_malloc (sizeof (struct GNUNET_DHT_MonitorStartStopMessage) +
+ sizeof (struct PendingMessage));
+ m = (struct GNUNET_DHT_MonitorStartStopMessage *) &pending[1];
+ pending->msg = &m->header;
+ pending->handle = handle;
+ pending->free_on_send = GNUNET_YES;
+ m->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_START);
+ m->header.size = htons (sizeof (struct GNUNET_DHT_MonitorStartStopMessage));
+ m->type = htonl(type);
+ m->get = htons(NULL != get_cb);
+ m->get_resp = htons(NULL != get_resp_cb);
+ m->put = htons(NULL != put_cb);
+ if (NULL != key) {
+ m->filter_key = htons(1);
+ memcpy (&m->key, key, sizeof(struct GNUNET_HashCode));
+ }
+ GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
+ pending);
+ pending->in_pending_queue = GNUNET_YES;
+ process_pending_messages (handle);
+
+ return h;
+}
+
+
+/**
+ * Stop monitoring.
+ *
+ * @param handle The handle to the monitor request returned by monitor_start.
+ *
+ * On return get_handle will no longer be valid, caller must not use again!!!
+ */
+void
+GNUNET_DHT_monitor_stop (struct GNUNET_DHT_MonitorHandle *handle)
+{
+ struct GNUNET_DHT_MonitorStartStopMessage *m;
+ struct PendingMessage *pending;
+
+ GNUNET_CONTAINER_DLL_remove (handle->dht_handle->monitor_head,
+ handle->dht_handle->monitor_tail,
+ handle);
+
+ pending = GNUNET_malloc (sizeof (struct GNUNET_DHT_MonitorStartStopMessage) +
+ sizeof (struct PendingMessage));
+ m = (struct GNUNET_DHT_MonitorStartStopMessage *) &pending[1];
+ pending->msg = &m->header;
+ pending->handle = handle->dht_handle;
+ pending->free_on_send = GNUNET_YES;
+ m->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP);
+ m->header.size = htons (sizeof (struct GNUNET_DHT_MonitorStartStopMessage));
+ m->type = htonl(handle->type);
+ m->get = htons (NULL != handle->get_cb);
+ m->get_resp = htons(NULL != handle->get_resp_cb);
+ m->put = htons (NULL != handle->put_cb);
+ if (NULL != handle->key)
+ {
+ m->filter_key = htons (1);
+ m->key = *handle->key;
+ }
+ GNUNET_CONTAINER_DLL_insert (handle->dht_handle->pending_head,
+ handle->dht_handle->pending_tail,
+ pending);
+ pending->in_pending_queue = GNUNET_YES;
+ process_pending_messages (handle->dht_handle);
+
+ GNUNET_free_non_null (handle->key);
+ GNUNET_free (handle);
+}
+
+#if ENABLE_MALICIOUS
+/**
+ * Turn the DHT service to act malicious.
+ *
+ * @param handle the DHT handle
+ * @param action 1 to make the service malicious; 0 to make it benign
+ * @param cont continuation to call when done (transmitting request to service)
+ * @param cont_cls closure for @a cont
+ */
+struct GNUNET_DHT_ActMaliciousHandle *
+GNUNET_DHT_act_malicious (struct GNUNET_DHT_Handle *handle,
+ unsigned int action,
+ GNUNET_DHT_PutContinuation cont,
+ void *cont_cls)
+{
+ struct GNUNET_DHT_ActMaliciousMessage *amm;
+ struct GNUNET_DHT_ActMaliciousHandle *mh;
+ struct PendingMessage *pending;
+ size_t msize;
+
+ msize = sizeof(struct GNUNET_DHT_ActMaliciousMessage);
+ if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break(0);
+ return NULL;
+ }
+ mh = GNUNET_new (struct GNUNET_DHT_ActMaliciousHandle);
+ mh->dht_handle = handle;
+ mh->cont = cont;
+ mh->cont_cls = cont_cls;
+ pending = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
+ amm = (struct GNUNET_DHT_ActMaliciousMessage *)&pending[1];
+ pending->msg = &amm->header;
+ pending->handle = handle;
+ pending->free_on_send = GNUNET_YES;
+ amm->header.size = htons (msize);
+ amm->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_ACT_MALICIOUS);
+ amm->action = action;
+ handle->mh = mh;
+ GNUNET_CONTAINER_DLL_insert (handle->pending_head, handle->pending_tail,
+ pending);
+ pending->in_pending_queue = GNUNET_YES;
process_pending_messages (handle);
+ return mh;
}
+#endif
/* end of dht_api.c */
projects / oweals / gnunet.git / blobdiff