gnunet-service-seti.c File Reference

#include "platform.h"
#include "gnunet-service-seti_protocol.h"
#include "gnunet_statistics_service.h"
#include "gnunet_cadet_service.h"
#include "gnunet_seti_service.h"
#include "gnunet_block_lib.h"
#include "seti.h"

Include dependency graph for gnunet-service-seti.c:

Go to the source code of this file.

Data Structures
struct	ElementEntry
	Information about an element element in the set. More...
struct	ClientState
	State we keep per client. More...
struct	Operation
	Operation context used to execute a set operation. More...
struct	SetContent
	SetContent stores the actual set elements, which may be shared by multiple generations derived from one set. More...
struct	Set
	A set that supports a specific operation with other peers. More...
struct	Listener
	A listener is inhabited by a client, and waits for evaluation requests from remote peers. More...

Macros
#define	INCOMING_CHANNEL_TIMEOUT   GNUNET_TIME_UNIT_MINUTES
	How long do we hold on to an incoming channel if there is no local listener before giving up?

Enumerations
enum	IntersectionOperationPhase {   PHASE_INITIAL , PHASE_COUNT_SENT , PHASE_BF_EXCHANGE , PHASE_MUST_SEND_DONE ,   PHASE_DONE_RECEIVED , PHASE_FINISHED }
	Current phase we are in for a intersection operation. More...

Functions
static void	send_client_removed_element (struct Operation *op, struct GNUNET_SETI_Element *element)
	If applicable in the current operation mode, send a result message to the client indicating we removed an element.
static int	_GSS_is_element_of_operation (struct ElementEntry *ee, struct Operation *op)
	Is element ee part of the set used by op?
static int	filtered_map_initialization (void *cls, const struct GNUNET_HashCode *key, void *value)
	Fills the "my_elements" hashmap with all relevant elements.
static int	iterator_bf_reduce (void *cls, const struct GNUNET_HashCode *key, void *value)
	Removes elements from our hashmap if they are not contained within the provided remote bloomfilter.
static int	iterator_bf_create (void *cls, const struct GNUNET_HashCode *key, void *value)
	Create initial bloomfilter based on all the elements given.
static void	_GSS_operation_destroy (struct Operation *op)
	Destroy the given operation.
static void	_GSS_operation_destroy2 (struct Operation *op)
	This function probably should not exist and be replaced by inlining more specific logic in the various places where it is called.
static void	incoming_destroy (struct Operation *op)
	Destroy an incoming request from a remote peer.
static void	send_client_done_and_destroy (void *cls)
	Signal to the client that the operation has finished and destroy the operation.
static void	fail_intersection_operation (struct Operation *op)
	Inform the client that the intersection operation has failed, and proceed to destroy the evaluate operation.
static void	send_bloomfilter (struct Operation *op)
	Send a bloomfilter to our peer.
static void	finished_local_operations (void *cls)
	Remember that we are done dealing with the local client AND have sent the other peer our message that we are done, so we are not just waiting for the channel to die before telling the local client that we are done as our last act.
static void	send_p2p_done (struct Operation *op)
	Notify the other peer that we are done.
static void	send_remaining_elements (void *cls)
	Send all elements in the full result iterator.
static int	initialize_map_unfiltered (void *cls, const struct GNUNET_HashCode *key, void *value)
	Fills the "my_elements" hashmap with the initial set of (non-deleted) elements from the set of the specification.
static void	send_element_count (struct Operation *op)
	Send our element count to the peer, in case our element count is lower than theirs.
static void	begin_bf_exchange (struct Operation *op)
	We go first, initialize our map with all elements and send the first Bloom filter.
static void	handle_intersection_p2p_element_info (void *cls, const struct IntersectionElementInfoMessage *msg)
	Handle the initial struct IntersectionElementInfoMessage from a remote peer.
static void	process_bf (struct Operation *op)
	Process a Bloomfilter once we got all the chunks.
static int	check_intersection_p2p_bf (void *cls, const struct BFMessage *msg)
	Check an BF message from a remote peer.
static void	handle_intersection_p2p_bf (void *cls, const struct BFMessage *msg)
	Handle an BF message from a remote peer.
static int	filter_all (void *cls, const struct GNUNET_HashCode *key, void *value)
	Remove all elements from our hashmap.
static void	handle_intersection_p2p_done (void *cls, const struct IntersectionDoneMessage *idm)
	Handle a done message from a remote peer.
static struct Operation *	get_incoming (uint32_t id)
	Get the incoming socket associated with the given id.
static void *	client_connect_cb (void *cls, struct GNUNET_SERVICE_Client *c, struct GNUNET_MQ_Handle *mq)
	Callback called when a client connects to the service.
static int	destroy_elements_iterator (void *cls, const struct GNUNET_HashCode *key, void *value)
	Iterator over hash map entries to free element entries.
static void	client_disconnect_cb (void *cls, struct GNUNET_SERVICE_Client *client, void *internal_cls)
	Clean up after a client has disconnected.
static int	check_incoming_msg (void *cls, const struct OperationRequestMessage *msg)
	Check a request for a set operation from another peer.
static void	handle_incoming_msg (void *cls, const struct OperationRequestMessage *msg)
	Handle a request for a set operation from another peer.
static void	handle_client_create_set (void *cls, const struct GNUNET_SETI_CreateMessage *msg)
	Called when a client wants to create a new set.
static void	incoming_timeout_cb (void *cls)
	Timeout happens iff:
static void *	channel_new_cb (void *cls, struct GNUNET_CADET_Channel *channel, const struct GNUNET_PeerIdentity *source)
	Method called whenever another peer has added us to a channel the other peer initiated.
static void	channel_end_cb (void *channel_ctx, const struct GNUNET_CADET_Channel *channel)
	Function called whenever a channel is destroyed.
static void	channel_window_cb (void *cls, const struct GNUNET_CADET_Channel *channel, int window_size)
	Function called whenever an MQ-channel's transmission window size changes.
static void	handle_client_listen (void *cls, const struct GNUNET_SETI_ListenMessage *msg)
	Called when a client wants to create a new listener.
static void	handle_client_reject (void *cls, const struct GNUNET_SETI_RejectMessage *msg)
	Called when the listening client rejects an operation request by another peer.
static int	check_client_set_add (void *cls, const struct GNUNET_SETI_ElementMessage *msg)
	Called when a client wants to add or remove an element to a set it inhabits.
static void	handle_client_set_add (void *cls, const struct GNUNET_SETI_ElementMessage *msg)
	Called when a client wants to add an element to a set it inhabits.
static void	advance_generation (struct Set *set)
	Advance the current generation of a set, adding exclusion ranges if necessary.
static int	check_client_evaluate (void *cls, const struct GNUNET_SETI_EvaluateMessage *msg)
	Called when a client wants to initiate a set operation with another peer.
static void	handle_client_evaluate (void *cls, const struct GNUNET_SETI_EvaluateMessage *msg)
	Called when a client wants to initiate a set operation with another peer.
static void	handle_client_cancel (void *cls, const struct GNUNET_SETI_CancelMessage *msg)
	Handle a request from the client to cancel a running set operation.
static void	handle_client_accept (void *cls, const struct GNUNET_SETI_AcceptMessage *msg)
	Handle a request from the client to accept a set operation that came from a remote peer.
static void	shutdown_task (void *cls)
	Called to clean up, after a shutdown has been requested.
static void	run (void *cls, const struct GNUNET_CONFIGURATION_Handle *cfg, struct GNUNET_SERVICE_Handle *service)
	Function called by the service's run method to run service-specific setup code.
	GNUNET_SERVICE_MAIN (GNUNET_OS_project_data_gnunet(), "seti", GNUNET_SERVICE_OPTION_NONE, &run, &client_connect_cb, &client_disconnect_cb, NULL, GNUNET_MQ_hd_fixed_size(client_accept, GNUNET_MESSAGE_TYPE_SETI_ACCEPT, struct GNUNET_SETI_AcceptMessage, NULL), GNUNET_MQ_hd_var_size(client_set_add, GNUNET_MESSAGE_TYPE_SETI_ADD, struct GNUNET_SETI_ElementMessage, NULL), GNUNET_MQ_hd_fixed_size(client_create_set, GNUNET_MESSAGE_TYPE_SETI_CREATE, struct GNUNET_SETI_CreateMessage, NULL), GNUNET_MQ_hd_var_size(client_evaluate, GNUNET_MESSAGE_TYPE_SETI_EVALUATE, struct GNUNET_SETI_EvaluateMessage, NULL), GNUNET_MQ_hd_fixed_size(client_listen, GNUNET_MESSAGE_TYPE_SETI_LISTEN, struct GNUNET_SETI_ListenMessage, NULL), GNUNET_MQ_hd_fixed_size(client_reject, GNUNET_MESSAGE_TYPE_SETI_REJECT, struct GNUNET_SETI_RejectMessage, NULL), GNUNET_MQ_hd_fixed_size(client_cancel, GNUNET_MESSAGE_TYPE_SETI_CANCEL, struct GNUNET_SETI_CancelMessage, NULL), GNUNET_MQ_handler_end())
	Define "main" method using service macro.

Variables
static struct GNUNET_CADET_Handle *	cadet
	Handle to the cadet service, used to listen for and connect to remote peers.
static struct GNUNET_STATISTICS_Handle *	_GSS_statistics
	Statistics handle.
static struct Listener *	listener_head
	Listeners are held in a doubly linked list.
static struct Listener *	listener_tail
	Listeners are held in a doubly linked list.
static unsigned int	num_clients
	Number of active clients.
static int	in_shutdown
	Are we in shutdown? if GNUNET_YES and the number of clients drops to zero, disconnect from CADET.
static uint32_t	suggest_id
	Counter for allocating unique IDs for clients, used to identify incoming operation requests from remote peers, that the client can choose to accept or refuse.

Macro Definition Documentation

INCOMING_CHANNEL_TIMEOUT

#define INCOMING_CHANNEL_TIMEOUT   GNUNET_TIME_UNIT_MINUTES

How long do we hold on to an incoming channel if there is no local listener before giving up?

Definition at line 38 of file gnunet-service-seti.c.

Enumeration Type Documentation

IntersectionOperationPhase

enum IntersectionOperationPhase

Current phase we are in for a intersection operation.

Enumerator
PHASE_INITIAL	We are just starting.
PHASE_COUNT_SENT	We have send the number of our elements to the other peer, but did not setup our element set yet.
PHASE_BF_EXCHANGE	We have initialized our set and are now reducing it by exchanging Bloom filters until one party notices the their element hashes are equal.
PHASE_MUST_SEND_DONE	We must next send the P2P DONE message (after finishing mostly with the local client). Then we will wait for the channel to close.
PHASE_DONE_RECEIVED	We have received the P2P DONE message, and must finish with the local client before terminating the channel.
PHASE_FINISHED	The protocol is over. Results may still have to be sent to the client.

Definition at line 44 of file gnunet-service-seti.c.

{
  PHASE_INITIAL,
 
  PHASE_COUNT_SENT,
 
  PHASE_BF_EXCHANGE,
 
  PHASE_MUST_SEND_DONE,
 
  PHASE_DONE_RECEIVED,
 
  PHASE_FINISHED
};

Function Documentation

send_client_removed_element()

static void send_client_removed_element ( struct Operation *  op, struct GNUNET_SETI_Element *  element  )

static

If applicable in the current operation mode, send a result message to the client indicating we removed an element.

Parameters

op	intersection operation
element	element to send

Definition at line 517 of file gnunet-service-seti.c.

{
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SETI_ResultMessage *rm;
 
  if (GNUNET_YES == op->return_intersection)
  {
    GNUNET_break (0);
    return; /* Wrong mode for transmitting removed elements */
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending removed element (size %u) to client\n",
              element->size);
  GNUNET_STATISTICS_update (_GSS_statistics,
                            "# Element removed messages sent",
                            1,
                            GNUNET_NO);
  GNUNET_assert (0 != op->client_request_id);
  ev = GNUNET_MQ_msg_extra (rm,
                            element->size,
                            GNUNET_MESSAGE_TYPE_SETI_RESULT);
  if (NULL == ev)
  {
    GNUNET_break (0);
    return;
  }
  rm->result_status = htons (GNUNET_SETI_STATUS_DEL_LOCAL);
  rm->request_id = htonl (op->client_request_id);
  rm->element_type = element->element_type;
  GNUNET_memcpy (&rm[1],
                 element->data,
                 element->size);
  GNUNET_MQ_send (op->set->cs->mq,
                  ev);
}

References _GSS_statistics, GNUNET_SETI_Element::data, GNUNET_SETI_Element::element_type, GNUNET_SETI_ResultMessage::element_type, GNUNET_assert, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_SETI_RESULT, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NO, GNUNET_SETI_STATUS_DEL_LOCAL, GNUNET_STATISTICS_update(), GNUNET_YES, op, GNUNET_SETI_ResultMessage::request_id, GNUNET_SETI_ResultMessage::result_status, and GNUNET_SETI_Element::size.

Referenced by filter_all(), filtered_map_initialization(), and iterator_bf_reduce().

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_GSS_is_element_of_operation()

static int _GSS_is_element_of_operation ( struct ElementEntry *  ee, struct Operation *  op  )

static

Is element ee part of the set used by op?

Parameters

ee	element to test
op	operation the defines the set and its generation

Returns

GNUNET_YES if the element is in the set, GNUNET_NO if not

Definition at line 563 of file gnunet-service-seti.c.

{
  return op->generation_created >= ee->generation_added;
}

References ElementEntry::generation_added, and op.

Referenced by filtered_map_initialization(), and initialize_map_unfiltered().

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filtered_map_initialization()

static int filtered_map_initialization ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Fills the "my_elements" hashmap with all relevant elements.

Parameters

cls	the struct Operation * we are performing
key	current key code
value	the struct ElementEntry * from the hash map

Returns

GNUNET_YES (we should continue to iterate)

Definition at line 579 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct ElementEntry *ee = value;
  struct GNUNET_HashCode mutated_hash;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "FIMA called for %s:%u\n",
              GNUNET_h2s (&ee->element_hash),
              ee->element.size);
 
  if (GNUNET_NO == _GSS_is_element_of_operation (ee, op))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Reduced initialization, not starting with %s:%u (wrong generation)\n",
                GNUNET_h2s (&ee->element_hash),
                ee->element.size);
    return GNUNET_YES;   /* element not valid in our operation's generation */
  }
 
  /* Test if element is in other peer's bloomfilter */
  GNUNET_BLOCK_mingle_hash (&ee->element_hash,
                            op->salt,
                            &mutated_hash);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Testing mingled hash %s with salt %u\n",
              GNUNET_h2s (&mutated_hash),
              op->salt);
  if (GNUNET_NO ==
      GNUNET_CONTAINER_bloomfilter_test (op->remote_bf,
                                         &mutated_hash))
  {
    /* remove this element */
    send_client_removed_element (op,
                                 &ee->element);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Reduced initialization, not starting with %s:%u\n",
                GNUNET_h2s (&ee->element_hash),
                ee->element.size);
    return GNUNET_YES;
  }
  op->my_element_count++;
  GNUNET_CRYPTO_hash_xor (&op->my_xor,
                          &ee->element_hash,
                          &op->my_xor);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Filtered initialization of my_elements, adding %s:%u\n",
              GNUNET_h2s (&ee->element_hash),
              ee->element.size);
  GNUNET_break (GNUNET_YES ==
                GNUNET_CONTAINER_multihashmap_put (op->my_elements,
                                                   &ee->element_hash,
                                                   ee,
                                                   GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
 
  return GNUNET_YES;
}

References _GSS_is_element_of_operation(), ElementEntry::element, ElementEntry::element_hash, GNUNET_BLOCK_mingle_hash(), GNUNET_break, GNUNET_CONTAINER_bloomfilter_test(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CRYPTO_hash_xor(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_NO, GNUNET_YES, op, send_client_removed_element(), GNUNET_SET_Element::size, and value.

Referenced by process_bf().

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iterator_bf_reduce()

static int iterator_bf_reduce ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Removes elements from our hashmap if they are not contained within the provided remote bloomfilter.

Parameters

cls	closure with the struct Operation *
key	current key code
value	value in the hash map

Returns

GNUNET_YES (we should continue to iterate)

Definition at line 650 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct ElementEntry *ee = value;
  struct GNUNET_HashCode mutated_hash;
 
  GNUNET_BLOCK_mingle_hash (&ee->element_hash,
                            op->salt,
                            &mutated_hash);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Testing mingled hash %s with salt %u\n",
              GNUNET_h2s (&mutated_hash),
              op->salt);
  if (GNUNET_NO ==
      GNUNET_CONTAINER_bloomfilter_test (op->remote_bf,
                                         &mutated_hash))
  {
    GNUNET_break (0 < op->my_element_count);
    op->my_element_count--;
    GNUNET_CRYPTO_hash_xor (&op->my_xor,
                            &ee->element_hash,
                            &op->my_xor);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Bloom filter reduction of my_elements, removing %s:%u\n",
                GNUNET_h2s (&ee->element_hash),
                ee->element.size);
    GNUNET_assert (GNUNET_YES ==
                   GNUNET_CONTAINER_multihashmap_remove (op->my_elements,
                                                         &ee->element_hash,
                                                         ee));
    send_client_removed_element (op,
                                 &ee->element);
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Bloom filter reduction of my_elements, keeping %s:%u\n",
                GNUNET_h2s (&ee->element_hash),
                ee->element.size);
  }
  return GNUNET_YES;
}

References ElementEntry::element, ElementEntry::element_hash, GNUNET_assert, GNUNET_BLOCK_mingle_hash(), GNUNET_break, GNUNET_CONTAINER_bloomfilter_test(), GNUNET_CONTAINER_multihashmap_remove(), GNUNET_CRYPTO_hash_xor(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_NO, GNUNET_YES, op, send_client_removed_element(), GNUNET_SET_Element::size, and value.

Referenced by process_bf().

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iterator_bf_create()

static int iterator_bf_create ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Create initial bloomfilter based on all the elements given.

Parameters

cls	the struct Operation *
key	current key code
value	the struct ElementEntry to process

Returns

GNUNET_YES (we should continue to iterate)

Definition at line 705 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct ElementEntry *ee = value;
  struct GNUNET_HashCode mutated_hash;
 
  GNUNET_BLOCK_mingle_hash (&ee->element_hash,
                            op->salt,
                            &mutated_hash);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Initializing BF with hash %s with salt %u\n",
              GNUNET_h2s (&mutated_hash),
              op->salt);
  GNUNET_CONTAINER_bloomfilter_add (op->local_bf,
                                    &mutated_hash);
  return GNUNET_YES;
}

References ElementEntry::element_hash, GNUNET_BLOCK_mingle_hash(), GNUNET_CONTAINER_bloomfilter_add(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_YES, op, and value.

Referenced by send_bloomfilter().

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_GSS_operation_destroy()

static void _GSS_operation_destroy ( struct Operation *  op )

static

Destroy the given operation.

Used for any operation where both peers were known and that thus actually had a vt and channel. Must not be used for operations where 'listener' is still set and we do not know the other peer.

Call the implementation-specific cancel function of the operation. Disconnects from the remote peer. Does not disconnect the client, as there may be multiple operations per set.

Parameters

op	operation to destroy

Definition at line 739 of file gnunet-service-seti.c.

{
  struct Set *set = op->set;
  struct GNUNET_CADET_Channel *channel;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying operation %p\n", op);
  GNUNET_assert (NULL == op->listener);
  if (NULL != op->remote_bf)
  {
    GNUNET_CONTAINER_bloomfilter_free (op->remote_bf);
    op->remote_bf = NULL;
  }
  if (NULL != op->local_bf)
  {
    GNUNET_CONTAINER_bloomfilter_free (op->local_bf);
    op->local_bf = NULL;
  }
  if (NULL != op->my_elements)
  {
    GNUNET_CONTAINER_multihashmap_destroy (op->my_elements);
    op->my_elements = NULL;
  }
  if (NULL != op->full_result_iter)
  {
    GNUNET_CONTAINER_multihashmap_iterator_destroy (
      op->full_result_iter);
    op->full_result_iter = NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Destroying intersection op state done\n");
  if (NULL != set)
  {
    GNUNET_CONTAINER_DLL_remove (set->ops_head,
                                 set->ops_tail,
                                 op);
    op->set = NULL;
  }
  if (NULL != op->context_msg)
  {
    GNUNET_free (op->context_msg);
    op->context_msg = NULL;
  }
  if (NULL != (channel = op->channel))
  {
    /* This will free op; called conditionally as this helper function
       is also called from within the channel disconnect handler. */
    op->channel = NULL;
    GNUNET_CADET_channel_destroy (channel);
  }
  /* We rely on the channel end handler to free 'op'. When 'op->channel' was NULL,
   * there was a channel end handler that will free 'op' on the call stack. */
}

References GNUNET_assert, GNUNET_CADET_channel_destroy(), GNUNET_CONTAINER_bloomfilter_free(), GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_iterator_destroy(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, op, Set::ops_head, and Set::ops_tail.

Referenced by _GSS_operation_destroy2(), client_disconnect_cb(), fail_intersection_operation(), handle_client_cancel(), and send_client_done_and_destroy().

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_GSS_operation_destroy2()

static void _GSS_operation_destroy2 ( struct Operation *  op )

static

This function probably should not exist and be replaced by inlining more specific logic in the various places where it is called.

Definition at line 867 of file gnunet-service-seti.c.

{
  struct GNUNET_CADET_Channel *channel;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "channel_end_cb called\n");
  if (NULL != (channel = op->channel))
  {
    /* This will free op; called conditionally as this helper function
       is also called from within the channel disconnect handler. */
    op->channel = NULL;
    GNUNET_CADET_channel_destroy (channel);
  }
  if (NULL != op->listener)
  {
    incoming_destroy (op);
    return;
  }
  if (NULL != op->set)
  {
    if (GNUNET_YES == op->channel_death_expected)
    {
      /* oh goodie, we are done! */
      send_client_done_and_destroy (op);
    }
    else
    {
      /* sorry, channel went down early, too bad. */
      _GSS_operation_destroy (op);
    }
  }
  else
    _GSS_operation_destroy (op);
  GNUNET_free (op);
}

References _GSS_operation_destroy(), GNUNET_CADET_channel_destroy(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_YES, incoming_destroy(), op, and send_client_done_and_destroy().

Referenced by channel_end_cb(), handle_client_reject(), and incoming_destroy().

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incoming_destroy()

static void incoming_destroy ( struct Operation *  op )

static

Destroy an incoming request from a remote peer.

Parameters

op	remote request to destroy

Definition at line 808 of file gnunet-service-seti.c.

{
  struct Listener *listener;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Destroying incoming operation %p\n",
              op);
  if (NULL != (listener = op->listener))
  {
    GNUNET_CONTAINER_DLL_remove (listener->op_head,
                                 listener->op_tail,
                                 op);
    op->listener = NULL;
  }
  if (NULL != op->timeout_task)
  {
    GNUNET_SCHEDULER_cancel (op->timeout_task);
    op->timeout_task = NULL;
  }
  _GSS_operation_destroy2 (op);
}

References _GSS_operation_destroy2(), GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_SCHEDULER_cancel(), op, Listener::op_head, and Listener::op_tail.

Referenced by _GSS_operation_destroy2(), client_disconnect_cb(), and incoming_timeout_cb().

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send_client_done_and_destroy()

static void send_client_done_and_destroy ( void *  cls )

static

Signal to the client that the operation has finished and destroy the operation.

Parameters

cls	operation to destroy

Definition at line 838 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SETI_ResultMessage *rm;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Intersection succeeded, sending DONE to local client\n");
  GNUNET_STATISTICS_update (_GSS_statistics,
                            "# Intersection operations succeeded",
                            1,
                            GNUNET_NO);
  ev = GNUNET_MQ_msg (rm,
                      GNUNET_MESSAGE_TYPE_SETI_RESULT);
  rm->request_id = htonl (op->client_request_id);
  rm->result_status = htons (GNUNET_SETI_STATUS_DONE);
  rm->element_type = htons (0);
  GNUNET_MQ_send (op->set->cs->mq,
                  ev);
  _GSS_operation_destroy (op);
}

References _GSS_operation_destroy(), _GSS_statistics, GNUNET_SETI_ResultMessage::element_type, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_RESULT, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_NO, GNUNET_SETI_STATUS_DONE, GNUNET_STATISTICS_update(), op, GNUNET_SETI_ResultMessage::request_id, and GNUNET_SETI_ResultMessage::result_status.

Referenced by _GSS_operation_destroy2(), handle_intersection_p2p_done(), and send_remaining_elements().

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fail_intersection_operation()

static void fail_intersection_operation ( struct Operation *  op )

static

Inform the client that the intersection operation has failed, and proceed to destroy the evaluate operation.

Parameters

op	the intersection operation to fail

Definition at line 911 of file gnunet-service-seti.c.

{
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SETI_ResultMessage *msg;
 
  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              "Intersection operation failed\n");
  GNUNET_STATISTICS_update (_GSS_statistics,
                            "# Intersection operations failed",
                            1,
                            GNUNET_NO);
  if (NULL != op->my_elements)
  {
    GNUNET_CONTAINER_multihashmap_destroy (op->my_elements);
    op->my_elements = NULL;
  }
  ev = GNUNET_MQ_msg (msg,
                      GNUNET_MESSAGE_TYPE_SETI_RESULT);
  msg->result_status = htons (GNUNET_SETI_STATUS_FAILURE);
  msg->request_id = htonl (op->client_request_id);
  msg->element_type = htons (0);
  GNUNET_MQ_send (op->set->cs->mq,
                  ev);
  _GSS_operation_destroy (op);
}

References _GSS_operation_destroy(), _GSS_statistics, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_RESULT, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_NO, GNUNET_SETI_STATUS_FAILURE, GNUNET_STATISTICS_update(), msg, and op.

Referenced by handle_intersection_p2p_bf(), handle_intersection_p2p_done(), handle_intersection_p2p_element_info(), and process_bf().

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send_bloomfilter()

static void send_bloomfilter ( struct Operation *  op )

static

Send a bloomfilter to our peer.

After the result done message has been sent to the client, destroy the evaluate operation.

Parameters

op	intersection operation

Definition at line 945 of file gnunet-service-seti.c.

{
  struct GNUNET_MQ_Envelope *ev;
  struct BFMessage *msg;
  uint32_t bf_size;
  uint32_t bf_elementbits;
  uint32_t chunk_size;
  char *bf_data;
  uint32_t offset;
 
  /* We consider the ratio of the set sizes to determine
     the number of bits per element, as the smaller set
     should use more bits to maximize its set reduction
     potential and minimize overall bandwidth consumption. */
  bf_elementbits = 2 + ceil (log2 ((double)
                                   (op->remote_element_count
                                    / (double) op->my_element_count)));
  if (bf_elementbits < 1)
    bf_elementbits = 1; /* make sure k is not 0 */
  /* optimize BF-size to ~50% of bits set */
  bf_size = ceil ((double) (op->my_element_count
                            * bf_elementbits / log (2)));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending Bloom filter (%u) of size %u bytes\n",
              (unsigned int) bf_elementbits,
              (unsigned int) bf_size);
  op->local_bf = GNUNET_CONTAINER_bloomfilter_init (NULL,
                                                    bf_size,
                                                    bf_elementbits);
  op->salt = GNUNET_CRYPTO_random_u32 (UINT32_MAX);
  GNUNET_CONTAINER_multihashmap_iterate (op->my_elements,
                                         &iterator_bf_create,
                                         op);
 
  /* send our Bloom filter */
  GNUNET_STATISTICS_update (_GSS_statistics,
                            "# Intersection Bloom filters sent",
                            1,
                            GNUNET_NO);
  chunk_size = 60 * 1024 - sizeof(struct BFMessage);
  if (bf_size <= chunk_size)
  {
    /* singlepart */
    chunk_size = bf_size;
    ev = GNUNET_MQ_msg_extra (msg,
                              chunk_size,
                              GNUNET_MESSAGE_TYPE_SETI_P2P_BF);
    GNUNET_assert (GNUNET_SYSERR !=
                   GNUNET_CONTAINER_bloomfilter_get_raw_data (
                     op->local_bf,
                     (char *) &msg[1],
                     bf_size));
    msg->sender_element_count = htonl (op->my_element_count);
    msg->bloomfilter_total_length = htonl (bf_size);
    msg->bits_per_element = htonl (bf_elementbits);
    msg->sender_mutator = htonl (op->salt);
    msg->element_xor_hash = op->my_xor;
    GNUNET_MQ_send (op->mq, ev);
  }
  else
  {
    /* multipart */
    bf_data = GNUNET_malloc (bf_size);
    GNUNET_assert (GNUNET_SYSERR !=
                   GNUNET_CONTAINER_bloomfilter_get_raw_data (
                     op->local_bf,
                     bf_data,
                     bf_size));
    offset = 0;
    while (offset < bf_size)
    {
      if (bf_size - chunk_size < offset)
        chunk_size = bf_size - offset;
      ev = GNUNET_MQ_msg_extra (msg,
                                chunk_size,
                                GNUNET_MESSAGE_TYPE_SETI_P2P_BF);
      GNUNET_memcpy (&msg[1],
                     &bf_data[offset],
                     chunk_size);
      offset += chunk_size;
      msg->sender_element_count = htonl (op->my_element_count);
      msg->bloomfilter_total_length = htonl (bf_size);
      msg->bits_per_element = htonl (bf_elementbits);
      msg->sender_mutator = htonl (op->salt);
      msg->element_xor_hash = op->my_xor;
      GNUNET_MQ_send (op->mq, ev);
    }
    GNUNET_free (bf_data);
  }
  GNUNET_CONTAINER_bloomfilter_free (op->local_bf);
  op->local_bf = NULL;
}

References _GSS_statistics, GNUNET_assert, GNUNET_CONTAINER_bloomfilter_free(), GNUNET_CONTAINER_bloomfilter_get_raw_data(), GNUNET_CONTAINER_bloomfilter_init(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_SETI_P2P_BF, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_SYSERR, iterator_bf_create(), msg, and op.

Referenced by begin_bf_exchange(), and process_bf().

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finished_local_operations()

static void finished_local_operations ( void *  cls )

static

Remember that we are done dealing with the local client AND have sent the other peer our message that we are done, so we are not just waiting for the channel to die before telling the local client that we are done as our last act.

Parameters

cls	the struct Operation.

Definition at line 1048 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "DONE sent to other peer, now waiting for other end to close the channel\n");
  op->phase = PHASE_FINISHED;
  op->channel_death_expected = GNUNET_YES;
}

References GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_YES, op, and PHASE_FINISHED.

Referenced by send_p2p_done().

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send_p2p_done()

static void send_p2p_done ( struct Operation *  op )

static

Notify the other peer that we are done.

Once this message is out, we still need to notify the local client that we are done.

Parameters

op	operation to notify for.

Definition at line 1067 of file gnunet-service-seti.c.

{
  struct GNUNET_MQ_Envelope *ev;
  struct IntersectionDoneMessage *idm;
 
  GNUNET_assert (PHASE_MUST_SEND_DONE == op->phase);
  GNUNET_assert (GNUNET_NO == op->channel_death_expected);
  ev = GNUNET_MQ_msg (idm,
                      GNUNET_MESSAGE_TYPE_SETI_P2P_DONE);
  idm->final_element_count = htonl (op->my_element_count);
  idm->element_xor_hash = op->my_xor;
  GNUNET_MQ_notify_sent (ev,
                         &finished_local_operations,
                         op);
  GNUNET_MQ_send (op->mq,
                  ev);
}

References IntersectionDoneMessage::element_xor_hash, IntersectionDoneMessage::final_element_count, finished_local_operations(), GNUNET_assert, GNUNET_MESSAGE_TYPE_SETI_P2P_DONE, GNUNET_MQ_msg, GNUNET_MQ_notify_sent(), GNUNET_MQ_send(), GNUNET_NO, op, and PHASE_MUST_SEND_DONE.

Referenced by process_bf(), and send_remaining_elements().

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send_remaining_elements()

static void send_remaining_elements ( void *  cls )

static

Send all elements in the full result iterator.

Parameters

cls	the struct Operation *

Definition at line 1092 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  const void *nxt;
  const struct ElementEntry *ee;
  struct GNUNET_MQ_Envelope *ev;
  struct GNUNET_SETI_ResultMessage *rm;
  const struct GNUNET_SETI_Element *element;
  int res;
 
  if (GNUNET_NO == op->return_intersection)
  {
    GNUNET_break (0);
    return; /* Wrong mode for transmitting removed elements */
  }
  res = GNUNET_CONTAINER_multihashmap_iterator_next (
    op->full_result_iter,
    NULL,
    &nxt);
  if (GNUNET_NO == res)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Sending done and destroy because iterator ran out\n");
    GNUNET_CONTAINER_multihashmap_iterator_destroy (
      op->full_result_iter);
    op->full_result_iter = NULL;
    if (PHASE_DONE_RECEIVED == op->phase)
    {
      op->phase = PHASE_FINISHED;
      send_client_done_and_destroy (op);
    }
    else if (PHASE_MUST_SEND_DONE == op->phase)
    {
      send_p2p_done (op);
    }
    else
    {
      GNUNET_assert (0);
    }
    return;
  }
  ee = nxt;
  element = &ee->element;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending element %s:%u to client (full set)\n",
              GNUNET_h2s (&ee->element_hash),
              element->size);
  GNUNET_assert (0 != op->client_request_id);
  ev = GNUNET_MQ_msg_extra (rm,
                            element->size,
                            GNUNET_MESSAGE_TYPE_SETI_RESULT);
  GNUNET_assert (NULL != ev);
  rm->result_status = htons (GNUNET_SETI_STATUS_ADD_LOCAL);
  rm->request_id = htonl (op->client_request_id);
  rm->element_type = element->element_type;
  GNUNET_memcpy (&rm[1],
                 element->data,
                 element->size);
  GNUNET_MQ_notify_sent (ev,
                         &send_remaining_elements,
                         op);
  GNUNET_MQ_send (op->set->cs->mq,
                  ev);
}

References GNUNET_SETI_Element::data, ElementEntry::element, ElementEntry::element_hash, GNUNET_SETI_Element::element_type, GNUNET_SETI_ResultMessage::element_type, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_iterator_destroy(), GNUNET_CONTAINER_multihashmap_iterator_next(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_SETI_RESULT, GNUNET_MQ_msg_extra, GNUNET_MQ_notify_sent(), GNUNET_MQ_send(), GNUNET_NO, GNUNET_SETI_STATUS_ADD_LOCAL, op, PHASE_DONE_RECEIVED, PHASE_FINISHED, PHASE_MUST_SEND_DONE, GNUNET_SETI_ResultMessage::request_id, res, GNUNET_SETI_ResultMessage::result_status, send_client_done_and_destroy(), send_p2p_done(), send_remaining_elements(), and GNUNET_SETI_Element::size.

Referenced by handle_intersection_p2p_done(), process_bf(), and send_remaining_elements().

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initialize_map_unfiltered()

static int initialize_map_unfiltered ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Fills the "my_elements" hashmap with the initial set of (non-deleted) elements from the set of the specification.

Parameters

cls	closure with the struct Operation *
key	current key code for the element
value	value in the hash map with the struct ElementEntry *

Returns

GNUNET_YES (we should continue to iterate)

Definition at line 1168 of file gnunet-service-seti.c.

{
  struct ElementEntry *ee = value;
  struct Operation *op = cls;
 
  if (GNUNET_NO == _GSS_is_element_of_operation (ee, op))
    return GNUNET_YES; /* element not live in operation's generation */
  GNUNET_CRYPTO_hash_xor (&op->my_xor,
                          &ee->element_hash,
                          &op->my_xor);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Initial full initialization of my_elements, adding %s:%u\n",
              GNUNET_h2s (&ee->element_hash),
              ee->element.size);
  GNUNET_break (GNUNET_YES ==
                GNUNET_CONTAINER_multihashmap_put (op->my_elements,
                                                   &ee->element_hash,
                                                   ee,
                                                   GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  return GNUNET_YES;
}

References _GSS_is_element_of_operation(), ElementEntry::element, ElementEntry::element_hash, GNUNET_break, GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CRYPTO_hash_xor(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_NO, GNUNET_YES, op, GNUNET_SET_Element::size, and value.

Referenced by begin_bf_exchange().

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send_element_count()

static void send_element_count ( struct Operation *  op )

static

Send our element count to the peer, in case our element count is lower than theirs.

Parameters

op	intersection operation

Definition at line 1200 of file gnunet-service-seti.c.

{
  struct GNUNET_MQ_Envelope *ev;
  struct IntersectionElementInfoMessage *msg;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Sending our element count (%u)\n",
              op->my_element_count);
  ev = GNUNET_MQ_msg (msg,
                      GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO);
  msg->sender_element_count = htonl (op->my_element_count);
  GNUNET_MQ_send (op->mq, ev);
}

References GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO, GNUNET_MQ_msg, GNUNET_MQ_send(), msg, and op.

Referenced by handle_client_accept().

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begin_bf_exchange()

static void begin_bf_exchange ( struct Operation *  op )

static

We go first, initialize our map with all elements and send the first Bloom filter.

Parameters

op	operation to start exchange for

Definition at line 1222 of file gnunet-service-seti.c.

{
  op->phase = PHASE_BF_EXCHANGE;
  GNUNET_CONTAINER_multihashmap_iterate (op->set->content->elements,
                                         &initialize_map_unfiltered,
                                         op);
  send_bloomfilter (op);
}

References GNUNET_CONTAINER_multihashmap_iterate(), initialize_map_unfiltered(), op, PHASE_BF_EXCHANGE, and send_bloomfilter().

Referenced by handle_client_accept(), and handle_intersection_p2p_element_info().

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handle_intersection_p2p_element_info()

static void handle_intersection_p2p_element_info ( void *  cls, const struct IntersectionElementInfoMessage *  msg  )

static

Handle the initial struct IntersectionElementInfoMessage from a remote peer.

Parameters

cls	the intersection operation
mh	the header of the message

Definition at line 1240 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
 
  op->remote_element_count = ntohl (msg->sender_element_count);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received remote element count (%u), I have %u\n",
              op->remote_element_count,
              op->my_element_count);
  if (((PHASE_INITIAL != op->phase) &&
       (PHASE_COUNT_SENT != op->phase)) ||
      (op->my_element_count > op->remote_element_count) ||
      (0 == op->my_element_count) ||
      (0 == op->remote_element_count))
  {
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  }
  GNUNET_break (NULL == op->remote_bf);
  begin_bf_exchange (op);
  GNUNET_CADET_receive_done (op->channel);
}

References begin_bf_exchange(), fail_intersection_operation(), GNUNET_break, GNUNET_break_op, GNUNET_CADET_receive_done(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, msg, op, PHASE_COUNT_SENT, and PHASE_INITIAL.

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process_bf()

static void process_bf ( struct Operation *  op )

static

Process a Bloomfilter once we got all the chunks.

Parameters

op	the intersection operation

Definition at line 1273 of file gnunet-service-seti.c.

{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received BF in phase %u, foreign count is %u, my element count is %u/%u\n",
              op->phase,
              op->remote_element_count,
              op->my_element_count,
              GNUNET_CONTAINER_multihashmap_size (op->set->content->elements));
  switch (op->phase)
  {
  case PHASE_INITIAL:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  case PHASE_COUNT_SENT:
    /* This is the first BF being sent, build our initial map with
       filtering in place */
    op->my_element_count = 0;
    GNUNET_CONTAINER_multihashmap_iterate (op->set->content->elements,
                                           &filtered_map_initialization,
                                           op);
    break;
  case PHASE_BF_EXCHANGE:
    /* Update our set by reduction */
    GNUNET_CONTAINER_multihashmap_iterate (op->my_elements,
                                           &iterator_bf_reduce,
                                           op);
    break;
  case PHASE_MUST_SEND_DONE:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  case PHASE_DONE_RECEIVED:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  case PHASE_FINISHED:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  }
  GNUNET_CONTAINER_bloomfilter_free (op->remote_bf);
  op->remote_bf = NULL;
 
  if ((0 == op->my_element_count) ||  /* fully disjoint */
      ((op->my_element_count == op->remote_element_count) &&
       (0 == GNUNET_memcmp (&op->my_xor,
                            &op->other_xor))))
  {
    /* we are done */
    op->phase = PHASE_MUST_SEND_DONE;
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Intersection succeeded, sending DONE to other peer\n");
    GNUNET_CONTAINER_bloomfilter_free (op->local_bf);
    op->local_bf = NULL;
    if (GNUNET_YES == op->return_intersection)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Sending full result set (%u elements)\n",
                  GNUNET_CONTAINER_multihashmap_size (op->my_elements));
      op->full_result_iter
        = GNUNET_CONTAINER_multihashmap_iterator_create (
            op->my_elements);
      send_remaining_elements (op);
      return;
    }
    send_p2p_done (op);
    return;
  }
  op->phase = PHASE_BF_EXCHANGE;
  send_bloomfilter (op);
}

References fail_intersection_operation(), filtered_map_initialization(), GNUNET_break_op, GNUNET_CONTAINER_bloomfilter_free(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_CONTAINER_multihashmap_iterator_create(), GNUNET_CONTAINER_multihashmap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcmp, GNUNET_YES, iterator_bf_reduce(), op, PHASE_BF_EXCHANGE, PHASE_COUNT_SENT, PHASE_DONE_RECEIVED, PHASE_FINISHED, PHASE_INITIAL, PHASE_MUST_SEND_DONE, send_bloomfilter(), send_p2p_done(), and send_remaining_elements().

Referenced by handle_intersection_p2p_bf().

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check_intersection_p2p_bf()

static int check_intersection_p2p_bf ( void *  cls, const struct BFMessage *  msg  )

static

Check an BF message from a remote peer.

Parameters

cls	the intersection operation
msg	the header of the message

Returns

GNUNET_OK if msg is well-formed

Definition at line 1355 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
 
  (void) op;
  return GNUNET_OK;
}

References GNUNET_OK, and op.

handle_intersection_p2p_bf()

static void handle_intersection_p2p_bf ( void *  cls, const struct BFMessage *  msg  )

static

Handle an BF message from a remote peer.

Parameters

cls	the intersection operation
msg	the header of the message

Definition at line 1372 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  uint32_t bf_size;
  uint32_t chunk_size;
  uint32_t bf_bits_per_element;
 
  switch (op->phase)
  {
  case PHASE_INITIAL:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
 
  case PHASE_COUNT_SENT:
  case PHASE_BF_EXCHANGE:
    bf_size = ntohl (msg->bloomfilter_total_length);
    bf_bits_per_element = ntohl (msg->bits_per_element);
    chunk_size = htons (msg->header.size) - sizeof(struct BFMessage);
    op->other_xor = msg->element_xor_hash;
    if (bf_size == chunk_size)
    {
      if (NULL != op->bf_data)
      {
        GNUNET_break_op (0);
        fail_intersection_operation (op);
        return;
      }
      /* single part, done here immediately */
      op->remote_bf
        = GNUNET_CONTAINER_bloomfilter_init ((const char *) &msg[1],
                                             bf_size,
                                             bf_bits_per_element);
      op->salt = ntohl (msg->sender_mutator);
      op->remote_element_count = ntohl (msg->sender_element_count);
      process_bf (op);
      break;
    }
    /* multipart chunk */
    if (NULL == op->bf_data)
    {
      /* first chunk, initialize */
      op->bf_data = GNUNET_malloc (bf_size);
      op->bf_data_size = bf_size;
      op->bf_bits_per_element = bf_bits_per_element;
      op->bf_data_offset = 0;
      op->salt = ntohl (msg->sender_mutator);
      op->remote_element_count = ntohl (msg->sender_element_count);
    }
    else
    {
      /* increment */
      if ((op->bf_data_size != bf_size) ||
          (op->bf_bits_per_element != bf_bits_per_element) ||
          (op->bf_data_offset + chunk_size > bf_size) ||
          (op->salt != ntohl (msg->sender_mutator)) ||
          (op->remote_element_count != ntohl (msg->sender_element_count)))
      {
        GNUNET_break_op (0);
        fail_intersection_operation (op);
        return;
      }
    }
    GNUNET_memcpy (&op->bf_data[op->bf_data_offset],
                   (const char *) &msg[1],
                   chunk_size);
    op->bf_data_offset += chunk_size;
    if (op->bf_data_offset == bf_size)
    {
      /* last chunk, run! */
      op->remote_bf
        = GNUNET_CONTAINER_bloomfilter_init (op->bf_data,
                                             bf_size,
                                             bf_bits_per_element);
      GNUNET_free (op->bf_data);
      op->bf_data = NULL;
      op->bf_data_size = 0;
      process_bf (op);
    }
    break;
 
  default:
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  }
  GNUNET_CADET_receive_done (op->channel);
}

References Operation::bf_bits_per_element, fail_intersection_operation(), GNUNET_break_op, GNUNET_CADET_receive_done(), GNUNET_CONTAINER_bloomfilter_init(), GNUNET_free, GNUNET_malloc, GNUNET_memcpy, msg, op, PHASE_BF_EXCHANGE, PHASE_COUNT_SENT, PHASE_INITIAL, process_bf(), and GNUNET_MessageHeader::size.

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filter_all()

static int filter_all ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Remove all elements from our hashmap.

Parameters

cls	closure with the struct Operation *
key	current key code
value	value in the hash map

Returns

GNUNET_YES (we should continue to iterate)

Definition at line 1472 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct ElementEntry *ee = value;
 
  GNUNET_break (0 < op->my_element_count);
  op->my_element_count--;
  GNUNET_CRYPTO_hash_xor (&op->my_xor,
                          &ee->element_hash,
                          &op->my_xor);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Final reduction of my_elements, removing %s:%u\n",
              GNUNET_h2s (&ee->element_hash),
              ee->element.size);
  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CONTAINER_multihashmap_remove (op->my_elements,
                                                       &ee->element_hash,
                                                       ee));
  send_client_removed_element (op,
                               &ee->element);
  return GNUNET_YES;
}

References ElementEntry::element, ElementEntry::element_hash, GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_remove(), GNUNET_CRYPTO_hash_xor(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_YES, op, send_client_removed_element(), GNUNET_SET_Element::size, and value.

Referenced by handle_intersection_p2p_done().

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handle_intersection_p2p_done()

static void handle_intersection_p2p_done ( void *  cls, const struct IntersectionDoneMessage *  idm  )

static

Handle a done message from a remote peer.

Parameters

cls	the intersection operation
mh	the message

Definition at line 1505 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
 
  if (PHASE_BF_EXCHANGE != op->phase)
  {
    /* wrong phase to conclude? FIXME: Or should we allow this
       if the other peer has _initially_ already an empty set? */
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  }
  if (0 == ntohl (idm->final_element_count))
  {
    /* other peer determined empty set is the intersection,
       remove all elements */
    GNUNET_CONTAINER_multihashmap_iterate (op->my_elements,
                                           &filter_all,
                                           op);
  }
  if ((op->my_element_count != ntohl (idm->final_element_count)) ||
      (0 != GNUNET_memcmp (&op->my_xor,
                           &idm->element_xor_hash)))
  {
    /* Other peer thinks we are done, but we disagree on the result! */
    GNUNET_break_op (0);
    fail_intersection_operation (op);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Got IntersectionDoneMessage, have %u elements in intersection\n",
              op->my_element_count);
  op->phase = PHASE_DONE_RECEIVED;
  GNUNET_CADET_receive_done (op->channel);
 
  GNUNET_assert (GNUNET_NO == op->client_done_sent);
  if (GNUNET_YES == op->return_intersection)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Sending full result set to client (%u elements)\n",
                GNUNET_CONTAINER_multihashmap_size (op->my_elements));
    op->full_result_iter
      = GNUNET_CONTAINER_multihashmap_iterator_create (op->my_elements);
    send_remaining_elements (op);
    return;
  }
  op->phase = PHASE_FINISHED;
  send_client_done_and_destroy (op);
}

References IntersectionDoneMessage::element_xor_hash, fail_intersection_operation(), filter_all(), IntersectionDoneMessage::final_element_count, GNUNET_assert, GNUNET_break_op, GNUNET_CADET_receive_done(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_CONTAINER_multihashmap_iterator_create(), GNUNET_CONTAINER_multihashmap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_memcmp, GNUNET_NO, GNUNET_YES, op, PHASE_BF_EXCHANGE, PHASE_DONE_RECEIVED, PHASE_FINISHED, send_client_done_and_destroy(), and send_remaining_elements().

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get_incoming()

static struct Operation * get_incoming ( uint32_t  id )

static

Get the incoming socket associated with the given id.

Parameters

listener	the listener to look in
id	id to look for

Returns

the incoming socket associated with the id, or NULL if there is none

Definition at line 1566 of file gnunet-service-seti.c.

{
  for (struct Listener *listener = listener_head; NULL != listener;
       listener = listener->next)
  {
    for (struct Operation *op = listener->op_head; NULL != op; op = op->next)
      if (op->suggest_id == id)
        return op;
  }
  return NULL;
}

References Operation::listener, listener_head, Listener::next, GNUNET_ARM_Operation::next, op, and Listener::op_head.

Referenced by handle_client_accept(), and handle_client_reject().

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client_connect_cb()

static void * client_connect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  c, struct GNUNET_MQ_Handle *  mq  )

static

Callback called when a client connects to the service.

Parameters

cls	closure for the service
c	the new client that connected to the service
mq	the message queue used to send messages to the client

Returns

`struct ClientState`

Definition at line 1588 of file gnunet-service-seti.c.

{
  struct ClientState *cs;
 
  num_clients++;
  cs = GNUNET_new (struct ClientState);
  cs->client = c;
  cs->mq = mq;
  return cs;
}

References ClientState::client, GNUNET_new, ClientState::mq, mq, and num_clients.

destroy_elements_iterator()

static int destroy_elements_iterator ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Iterator over hash map entries to free element entries.

Parameters

cls	closure
key	current key code
value	a struct ElementEntry * to be free'd

Returns

GNUNET_YES (continue to iterate)

Definition at line 1611 of file gnunet-service-seti.c.

{
  struct ElementEntry *ee = value;
 
  GNUNET_free (ee);
  return GNUNET_YES;
}

References GNUNET_free, GNUNET_YES, and value.

Referenced by client_disconnect_cb().

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client_disconnect_cb()

static void client_disconnect_cb ( void *  cls, struct GNUNET_SERVICE_Client *  client, void *  internal_cls  )

static

Clean up after a client has disconnected.

Parameters

cls	closure, unused
client	the client to clean up after
internal_cls	the struct ClientState

Definition at line 1630 of file gnunet-service-seti.c.

{
  struct ClientState *cs = internal_cls;
  struct Operation *op;
  struct Listener *listener;
  struct Set *set;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected, cleaning up\n");
  if (NULL != (set = cs->set))
  {
    struct SetContent *content = set->content;
 
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying client's set\n");
    /* Destroy pending set operations */
    while (NULL != set->ops_head)
      _GSS_operation_destroy (set->ops_head);
 
    /* free set content (or at least decrement RC) */
    set->content = NULL;
    GNUNET_assert (0 != content->refcount);
    content->refcount--;
    if (0 == content->refcount)
    {
      GNUNET_assert (NULL != content->elements);
      GNUNET_CONTAINER_multihashmap_iterate (content->elements,
                                             &destroy_elements_iterator,
                                             NULL);
      GNUNET_CONTAINER_multihashmap_destroy (content->elements);
      content->elements = NULL;
      GNUNET_free (content);
    }
    GNUNET_free (set);
  }
 
  if (NULL != (listener = cs->listener))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Destroying client's listener\n");
    GNUNET_CADET_close_port (listener->open_port);
    listener->open_port = NULL;
    while (NULL != (op = listener->op_head))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                  "Destroying incoming operation `%u' from peer `%s'\n",
                  (unsigned int) op->client_request_id,
                  GNUNET_i2s (&op->peer));
      incoming_destroy (op);
    }
    GNUNET_CONTAINER_DLL_remove (listener_head, listener_tail, listener);
    GNUNET_free (listener);
  }
  GNUNET_free (cs);
  num_clients--;
  if ((GNUNET_YES == in_shutdown) && (0 == num_clients))
  {
    if (NULL != cadet)
    {
      GNUNET_CADET_disconnect (cadet);
      cadet = NULL;
    }
  }
}

References _GSS_operation_destroy(), cadet, Set::content, Set::cs, destroy_elements_iterator(), SetContent::elements, GNUNET_assert, GNUNET_CADET_close_port(), GNUNET_CADET_disconnect(), GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_YES, in_shutdown, incoming_destroy(), ClientState::listener, listener_head, listener_tail, num_clients, op, Listener::op_head, Listener::open_port, Set::ops_head, SetContent::refcount, and ClientState::set.

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check_incoming_msg()

static int check_incoming_msg ( void *  cls, const struct OperationRequestMessage *  msg  )

static

Check a request for a set operation from another peer.

Parameters

cls	the operation state
msg	the received message

Returns

GNUNET_OK if the channel should be kept alive, GNUNET_SYSERR to destroy the channel

Definition at line 1704 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct Listener *listener = op->listener;
  const struct GNUNET_MessageHeader *nested_context;
 
  /* double operation request */
  if (0 != op->suggest_id)
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  /* This should be equivalent to the previous condition, but can't hurt to check twice */
  if (NULL == listener)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  nested_context = GNUNET_MQ_extract_nested_mh (msg);
  if ((NULL != nested_context) &&
      (ntohs (nested_context->size) > GNUNET_SETI_CONTEXT_MESSAGE_MAX_SIZE))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  return GNUNET_OK;
}

References GNUNET_break, GNUNET_break_op, GNUNET_MQ_extract_nested_mh, GNUNET_OK, GNUNET_SETI_CONTEXT_MESSAGE_MAX_SIZE, GNUNET_SYSERR, msg, op, and GNUNET_MessageHeader::size.

handle_incoming_msg()

static void handle_incoming_msg ( void *  cls, const struct OperationRequestMessage *  msg  )

static

Handle a request for a set operation from another peer.

Checks if we have a listener waiting for such a request (and in that case initiates asking the listener about accepting the connection). If no listener is waiting, we queue the operation request in hope that a listener shows up soon (before timeout).

This msg is expected as the first and only msg handled through the non-operation bound virtual table, acceptance of this operation replaces our virtual table and subsequent msgs would be routed differently (as we then know what type of operation this is).

Parameters

cls	the operation state
msg	the received message

Returns

GNUNET_OK if the channel should be kept alive, GNUNET_SYSERR to destroy the channel

Definition at line 1752 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
  struct Listener *listener = op->listener;
  const struct GNUNET_MessageHeader *nested_context;
  struct GNUNET_MQ_Envelope *env;
  struct GNUNET_SETI_RequestMessage *cmsg;
 
  nested_context = GNUNET_MQ_extract_nested_mh (msg);
  /* Make a copy of the nested_context (application-specific context
     information that is opaque to set) so we can pass it to the
     listener later on */
  if (NULL != nested_context)
    op->context_msg = GNUNET_copy_message (nested_context);
  op->remote_element_count = ntohl (msg->element_count);
  GNUNET_log (
    GNUNET_ERROR_TYPE_DEBUG,
    "Received P2P operation request (port %s) for active listener\n",
    GNUNET_h2s (&op->listener->app_id));
  GNUNET_assert (0 == op->suggest_id);
  if (0 == suggest_id)
    suggest_id++;
  op->suggest_id = suggest_id++;
  GNUNET_assert (NULL != op->timeout_task);
  GNUNET_SCHEDULER_cancel (op->timeout_task);
  op->timeout_task = NULL;
  env = GNUNET_MQ_msg_nested_mh (cmsg,
                                 GNUNET_MESSAGE_TYPE_SETI_REQUEST,
                                 op->context_msg);
  GNUNET_log (
    GNUNET_ERROR_TYPE_DEBUG,
    "Suggesting incoming request with accept id %u to listener %p of client %p\n",
    op->suggest_id,
    listener,
    listener->cs);
  cmsg->accept_id = htonl (op->suggest_id);
  cmsg->peer_id = op->peer;
  GNUNET_MQ_send (listener->cs->mq, env);
  /* NOTE: GNUNET_CADET_receive_done() will be called in
   #handle_client_accept() */
}

References GNUNET_SETI_RequestMessage::accept_id, Listener::cs, env, GNUNET_assert, GNUNET_copy_message(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_REQUEST, GNUNET_MQ_extract_nested_mh, GNUNET_MQ_msg_nested_mh, GNUNET_MQ_send(), GNUNET_SCHEDULER_cancel(), ClientState::mq, msg, op, GNUNET_SETI_RequestMessage::peer_id, and suggest_id.

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handle_client_create_set()

static void handle_client_create_set ( void *  cls, const struct GNUNET_SETI_CreateMessage *  msg  )

static

Called when a client wants to create a new set.

This is typically the first request from a client, and includes the type of set operation to be performed.

Parameters

cls	client that sent the message
m	message sent by the client

Definition at line 1805 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client created new intersection set\n");
  if (NULL != cs->set)
  {
    /* There can only be one set per client */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  set = GNUNET_new (struct Set);
  set->content = GNUNET_new (struct SetContent);
  set->content->refcount = 1;
  set->content->elements = GNUNET_CONTAINER_multihashmap_create (1,
                                                                 GNUNET_YES);
  set->cs = cs;
  cs->set = set;
  GNUNET_SERVICE_client_continue (cs->client);
}

References ClientState::client, Set::content, Set::cs, SetContent::elements, GNUNET_break, GNUNET_CONTAINER_multihashmap_create(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_YES, SetContent::refcount, and ClientState::set.

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incoming_timeout_cb()

static void incoming_timeout_cb ( void *  cls )

static

Timeout happens iff:

• we suggested an operation to our listener, but did not receive a response in time
• we got the channel from a peer but no GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST

Parameters

cls	channel context
tc	context information (why was this task triggered now)

Definition at line 1841 of file gnunet-service-seti.c.

{
  struct Operation *op = cls;
 
  op->timeout_task = NULL;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Remote peer's incoming request timed out\n");
  incoming_destroy (op);
}

References GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, incoming_destroy(), and op.

Referenced by channel_new_cb().

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channel_new_cb()

static void * channel_new_cb ( void *  cls, struct GNUNET_CADET_Channel *  channel, const struct GNUNET_PeerIdentity *  source  )

static

Method called whenever another peer has added us to a channel the other peer initiated.

Only called (once) upon reception of data from a channel we listen on.

The channel context represents the operation itself and gets added to a DLL, from where it gets looked up when our local listener client responds to a proposed/suggested operation or connects and associates with this operation.

Parameters

cls	closure
channel	new handle to the channel
source	peer that started the channel

Returns

initial channel context for the channel returns NULL on error

Definition at line 1869 of file gnunet-service-seti.c.

{
  struct Listener *listener = cls;
  struct Operation *op;
 
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "New incoming channel\n");
  op = GNUNET_new (struct Operation);
  op->listener = listener;
  op->peer = *source;
  op->channel = channel;
  op->mq = GNUNET_CADET_get_mq (op->channel);
  op->salt = GNUNET_CRYPTO_random_u32 (UINT32_MAX);
  op->timeout_task = GNUNET_SCHEDULER_add_delayed (INCOMING_CHANNEL_TIMEOUT,
                                                   &incoming_timeout_cb,
                                                   op);
  GNUNET_CONTAINER_DLL_insert (listener->op_head,
                               listener->op_tail,
                               op);
  return op;
}

References Operation::channel, GNUNET_CADET_get_mq(), GNUNET_CONTAINER_DLL_insert, GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_new, GNUNET_SCHEDULER_add_delayed(), INCOMING_CHANNEL_TIMEOUT, incoming_timeout_cb(), Operation::listener, op, Listener::op_head, Listener::op_tail, and source.

Referenced by handle_client_listen().

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channel_end_cb()

static void channel_end_cb ( void *  channel_ctx, const struct GNUNET_CADET_Channel *  channel  )

static

Function called whenever a channel is destroyed.

Should clean up any associated state. It must NOT call GNUNET_CADET_channel_destroy() on the channel.

The peer_disconnect function is part of a a virtual table set initially either when a peer creates a new channel with us, or once we create a new channel ourselves (evaluate).

Once we know the exact type of operation (union/intersection), the vt is replaced with an operation specific instance (GSS[op]_vt).

Parameters

channel_ctx	place where local state associated with the channel is stored
channel	connection to the other end (henceforth invalid)

Definition at line 1911 of file gnunet-service-seti.c.

{
  struct Operation *op = channel_ctx;
 
  op->channel = NULL;
  _GSS_operation_destroy2 (op);
}

References _GSS_operation_destroy2(), and op.

Referenced by handle_client_evaluate(), and handle_client_listen().

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channel_window_cb()

static void channel_window_cb ( void *  cls, const struct GNUNET_CADET_Channel *  channel, int  window_size  )

static

Function called whenever an MQ-channel's transmission window size changes.

The first callback in an outgoing channel will be with a non-zero value and will mean the channel is connected to the destination.

For an incoming channel it will be called immediately after the GNUNET_CADET_ConnectEventHandler, also with a non-zero value.

Parameters

cls	Channel closure.
channel	Connection to the other end (henceforth invalid).
window_size	New window size. If the is more messages than buffer size this value will be negative..

Definition at line 1936 of file gnunet-service-seti.c.

{
  /* FIXME: not implemented, we could do flow control here... */
}

Referenced by handle_client_evaluate(), and handle_client_listen().

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handle_client_listen()

static void handle_client_listen ( void *  cls, const struct GNUNET_SETI_ListenMessage *  msg  )

static

Called when a client wants to create a new listener.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 1951 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
    GNUNET_MQ_hd_var_size (incoming_msg,
                           GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST,
                           struct OperationRequestMessage,
                           NULL),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_element_info,
                             GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO,
                             struct IntersectionElementInfoMessage,
                             NULL),
    GNUNET_MQ_hd_var_size (intersection_p2p_bf,
                           GNUNET_MESSAGE_TYPE_SETI_P2P_BF,
                           struct BFMessage,
                           NULL),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_done,
                             GNUNET_MESSAGE_TYPE_SETI_P2P_DONE,
                             struct IntersectionDoneMessage,
                             NULL),
    GNUNET_MQ_handler_end ()
  };
  struct Listener *listener;
 
  if (NULL != cs->listener)
  {
    /* max. one active listener per client! */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  listener = GNUNET_new (struct Listener);
  listener->cs = cs;
  cs->listener = listener;
  listener->app_id = msg->app_id;
  GNUNET_CONTAINER_DLL_insert (listener_head,
                               listener_tail,
                               listener);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "New listener for set intersection created (port %s)\n",
              GNUNET_h2s (&listener->app_id));
  listener->open_port = GNUNET_CADET_open_port (cadet,
                                                &msg->app_id,
                                                &channel_new_cb,
                                                listener,
                                                &channel_window_cb,
                                                &channel_end_cb,
                                                cadet_handlers);
  GNUNET_SERVICE_client_continue (cs->client);
}

References Listener::app_id, cadet, channel_end_cb(), channel_new_cb(), channel_window_cb(), ClientState::client, Listener::cs, GNUNET_break, GNUNET_CADET_open_port(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_P2P_BF, GNUNET_MESSAGE_TYPE_SETI_P2P_DONE, GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO, GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), ClientState::listener, listener_head, listener_tail, msg, and Listener::open_port.

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handle_client_reject()

static void handle_client_reject ( void *  cls, const struct GNUNET_SETI_RejectMessage *  msg  )

static

Called when the listening client rejects an operation request by another peer.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 2012 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Operation *op;
 
  op = get_incoming (ntohl (msg->accept_reject_id));
  if (NULL == op)
  {
    /* no matching incoming operation for this reject;
       could be that the other peer already disconnected... */
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Client rejected unknown operation %u\n",
                (unsigned int) ntohl (msg->accept_reject_id));
    GNUNET_SERVICE_client_continue (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Peer request (app %s) rejected by client\n",
              GNUNET_h2s (&cs->listener->app_id));
  _GSS_operation_destroy2 (op);
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_operation_destroy2(), Listener::app_id, ClientState::client, get_incoming(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_h2s(), GNUNET_log, GNUNET_SERVICE_client_continue(), ClientState::listener, msg, and op.

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check_client_set_add()

static int check_client_set_add ( void *  cls, const struct GNUNET_SETI_ElementMessage *  msg  )

static

Called when a client wants to add or remove an element to a set it inhabits.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 2044 of file gnunet-service-seti.c.

{
  /* NOTE: Technically, we should probably check with the
     block library whether the element we are given is well-formed */
  return GNUNET_OK;
}

References GNUNET_OK.

handle_client_set_add()

static void handle_client_set_add ( void *  cls, const struct GNUNET_SETI_ElementMessage *  msg  )

static

Called when a client wants to add an element to a set it inhabits.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 2060 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct GNUNET_SETI_Element el;
  struct ElementEntry *ee;
  struct GNUNET_HashCode hash;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested an operation */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  GNUNET_SERVICE_client_continue (cs->client);
  el.size = ntohs (msg->header.size) - sizeof(*msg);
  el.data = &msg[1];
  el.element_type = ntohs (msg->element_type);
  GNUNET_SETI_element_hash (&el,
                            &hash);
  ee = GNUNET_CONTAINER_multihashmap_get (set->content->elements,
                                          &hash);
  if (NULL == ee)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client inserts element %s of size %u\n",
                GNUNET_h2s (&hash),
                el.size);
    ee = GNUNET_malloc (el.size + sizeof(*ee));
    ee->element.size = el.size;
    GNUNET_memcpy (&ee[1], el.data, el.size);
    ee->element.data = &ee[1];
    ee->element.element_type = el.element_type;
    ee->remote = GNUNET_NO;
    ee->element_hash = hash;
    GNUNET_break (GNUNET_YES ==
                  GNUNET_CONTAINER_multihashmap_put (
                    set->content->elements,
                    &ee->element_hash,
                    ee,
                    GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client inserted element %s of size %u twice (ignored)\n",
                GNUNET_h2s (&hash),
                el.size);
    /* same element inserted twice */
    return;
  }
  set->current_set_element_count++;
}

References ClientState::client, Set::content, Set::current_set_element_count, GNUNET_SET_Element::data, el, ElementEntry::element, ElementEntry::element_hash, GNUNET_SET_Element::element_type, SetContent::elements, GNUNET_break, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_malloc, GNUNET_memcpy, GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SETI_element_hash(), GNUNET_YES, msg, ElementEntry::remote, ClientState::set, GNUNET_MessageHeader::size, and GNUNET_SET_Element::size.

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advance_generation()

static void advance_generation ( struct Set *  set )

static

Advance the current generation of a set, adding exclusion ranges if necessary.

Parameters

set	the set where we want to advance the generation

Definition at line 2124 of file gnunet-service-seti.c.

{
  if (set->current_generation == set->content->latest_generation)
  {
    set->content->latest_generation++;
    set->current_generation++;
    return;
  }
  GNUNET_assert (set->current_generation < set->content->latest_generation);
}

References Set::content, Set::current_generation, GNUNET_assert, and SetContent::latest_generation.

Referenced by handle_client_accept(), and handle_client_evaluate().

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check_client_evaluate()

static int check_client_evaluate ( void *  cls, const struct GNUNET_SETI_EvaluateMessage *  msg  )

static

Called when a client wants to initiate a set operation with another peer.

Initiates the CADET connection to the listener and sends the request.

Parameters

cls	client that sent the message
msg	message sent by the client

Returns

GNUNET_OK if the message is well-formed

Definition at line 2146 of file gnunet-service-seti.c.

{
  /* FIXME: suboptimal, even if the context below could be NULL,
     there are malformed messages this does not check for... */
  return GNUNET_OK;
}

References GNUNET_OK.

handle_client_evaluate()

static void handle_client_evaluate ( void *  cls, const struct GNUNET_SETI_EvaluateMessage *  msg  )

static

Called when a client wants to initiate a set operation with another peer.

Initiates the CADET connection to the listener and sends the request.

Parameters

cls	client that sent the message
msg	message sent by the client

Definition at line 2164 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Operation *op = GNUNET_new (struct Operation);
  const struct GNUNET_MQ_MessageHandler cadet_handlers[] = {
    GNUNET_MQ_hd_var_size (incoming_msg,
                           GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST,
                           struct OperationRequestMessage,
                           op),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_element_info,
                             GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO,
                             struct IntersectionElementInfoMessage,
                             op),
    GNUNET_MQ_hd_var_size (intersection_p2p_bf,
                           GNUNET_MESSAGE_TYPE_SETI_P2P_BF,
                           struct BFMessage,
                           op),
    GNUNET_MQ_hd_fixed_size (intersection_p2p_done,
                             GNUNET_MESSAGE_TYPE_SETI_P2P_DONE,
                             struct IntersectionDoneMessage,
                             op),
    GNUNET_MQ_handler_end ()
  };
  struct Set *set;
  const struct GNUNET_MessageHeader *context;
 
  if (NULL == (set = cs->set))
  {
    GNUNET_break (0);
    GNUNET_free (op);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  op->salt = GNUNET_CRYPTO_random_u32 (UINT32_MAX);
  op->peer = msg->target_peer;
  op->return_intersection = htonl (msg->return_intersection);
  fprintf (stderr,
           "Return intersection for evaluate is %d\n",
           op->return_intersection);
  op->client_request_id = ntohl (msg->request_id);
  context = GNUNET_MQ_extract_nested_mh (msg);
 
  /* Advance generation values, so that
     mutations won't interfere with the running operation. */
  op->set = set;
  op->generation_created = set->current_generation;
  advance_generation (set);
  GNUNET_CONTAINER_DLL_insert (set->ops_head,
                               set->ops_tail,
                               op);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Creating new CADET channel to port %s for set intersection\n",
              GNUNET_h2s (&msg->app_id));
  op->channel = GNUNET_CADET_channel_create (cadet,
                                             op,
                                             &msg->target_peer,
                                             &msg->app_id,
                                             &channel_window_cb,
                                             &channel_end_cb,
                                             cadet_handlers);
  op->mq = GNUNET_CADET_get_mq (op->channel);
  {
    struct GNUNET_MQ_Envelope *ev;
    struct OperationRequestMessage *msg_tmp;
 
    ev = GNUNET_MQ_msg_nested_mh (msg_tmp,
                                  GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST,
                                  context);
    if (NULL == ev)
    {
      /* the context message is too large!? */
      GNUNET_break (0);
      GNUNET_SERVICE_client_drop (cs->client);
      return;
    }
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Initiating intersection operation evaluation\n");
    /* we started the operation, thus we have to send the operation request */
    op->phase = PHASE_INITIAL;
    op->my_element_count = op->set->current_set_element_count;
    op->my_elements
      = GNUNET_CONTAINER_multihashmap_create (op->my_element_count,
                                              GNUNET_YES);
 
    msg_tmp->element_count = htonl (op->my_element_count);
    GNUNET_MQ_send (op->mq,
                    ev);
    op->phase = PHASE_COUNT_SENT;
    if (NULL != context)
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Sent op request with context message\n");
    else
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Sent op request without context message\n");
  }
  GNUNET_SERVICE_client_continue (cs->client);
}

References advance_generation(), cadet, channel_end_cb(), channel_window_cb(), ClientState::client, context, Set::current_generation, OperationRequestMessage::element_count, GNUNET_break, GNUNET_CADET_channel_create(), GNUNET_CADET_get_mq(), GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_multihashmap_create(), GNUNET_CRYPTO_random_u32(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_h2s(), GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_P2P_BF, GNUNET_MESSAGE_TYPE_SETI_P2P_DONE, GNUNET_MESSAGE_TYPE_SETI_P2P_ELEMENT_INFO, GNUNET_MESSAGE_TYPE_SETI_P2P_OPERATION_REQUEST, GNUNET_MQ_extract_nested_mh, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_MQ_msg_nested_mh, GNUNET_MQ_send(), GNUNET_new, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_YES, msg, op, Set::ops_head, Set::ops_tail, PHASE_COUNT_SENT, PHASE_INITIAL, and ClientState::set.

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handle_client_cancel()

static void handle_client_cancel ( void *  cls, const struct GNUNET_SETI_CancelMessage *  msg  )

static

Handle a request from the client to cancel a running set operation.

Parameters

cls	the client
msg	the message

Definition at line 2271 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct Operation *op;
  int found;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested an operation */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  found = GNUNET_NO;
  for (op = set->ops_head; NULL != op; op = op->next)
  {
    if (op->client_request_id == ntohl (msg->request_id))
    {
      found = GNUNET_YES;
      break;
    }
  }
  if (GNUNET_NO == found)
  {
    /* It may happen that the operation was already destroyed due to
     * the other peer disconnecting.  The client may not know about this
     * yet and try to cancel the (just barely non-existent) operation.
     * So this is not a hard error.
     *///
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Client canceled non-existent op %u\n",
                (uint32_t) ntohl (msg->request_id));
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Client requested cancel for op %u\n",
                (uint32_t) ntohl (msg->request_id));
    _GSS_operation_destroy (op);
  }
  GNUNET_SERVICE_client_continue (cs->client);
}

References _GSS_operation_destroy(), ClientState::client, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_YES, msg, GNUNET_ARM_Operation::next, op, Set::ops_head, ClientState::set, and Operation::set.

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handle_client_accept()

static void handle_client_accept ( void *  cls, const struct GNUNET_SETI_AcceptMessage *  msg  )

static

Handle a request from the client to accept a set operation that came from a remote peer.

We forward the accept to the associated operation for handling

Parameters

cls	the client
msg	the message

Definition at line 2326 of file gnunet-service-seti.c.

{
  struct ClientState *cs = cls;
  struct Set *set;
  struct Operation *op;
  struct GNUNET_SETI_ResultMessage *result_message;
  struct GNUNET_MQ_Envelope *ev;
  struct Listener *listener;
 
  if (NULL == (set = cs->set))
  {
    /* client without a set requested to accept */
    GNUNET_break (0);
    GNUNET_SERVICE_client_drop (cs->client);
    return;
  }
  op = get_incoming (ntohl (msg->accept_reject_id));
  if (NULL == op)
  {
    /* It is not an error if the set op does not exist -- it may
    * have been destroyed when the partner peer disconnected. */
    GNUNET_log (
      GNUNET_ERROR_TYPE_INFO,
      "Client %p accepted request %u of listener %p that is no longer active\n",
      cs,
      ntohl (msg->accept_reject_id),
      cs->listener);
    ev = GNUNET_MQ_msg (result_message,
                        GNUNET_MESSAGE_TYPE_SETI_RESULT);
    result_message->request_id = msg->request_id;
    result_message->result_status = htons (GNUNET_SETI_STATUS_FAILURE);
    GNUNET_MQ_send (set->cs->mq, ev);
    GNUNET_SERVICE_client_continue (cs->client);
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Client accepting request %u\n",
              (uint32_t) ntohl (msg->accept_reject_id));
  listener = op->listener;
  op->listener = NULL;
  op->return_intersection = htonl (msg->return_intersection);
  fprintf (stderr,
           "Return intersection for accept is %d\n",
           op->return_intersection);
  GNUNET_CONTAINER_DLL_remove (listener->op_head,
                               listener->op_tail,
                               op);
  op->set = set;
  GNUNET_CONTAINER_DLL_insert (set->ops_head,
                               set->ops_tail,
                               op);
  op->client_request_id = ntohl (msg->request_id);
 
  /* Advance generation values, so that future mutations do not
     interfere with the running operation. */
  op->generation_created = set->current_generation;
  advance_generation (set);
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Accepting set intersection operation\n");
    op->phase = PHASE_INITIAL;
    op->my_element_count
      = op->set->current_set_element_count;
    op->my_elements
      = GNUNET_CONTAINER_multihashmap_create (
          GNUNET_MIN (op->my_element_count,
                      op->remote_element_count),
          GNUNET_YES);
    if (op->remote_element_count < op->my_element_count)
    {
      /* If the other peer (Alice) has fewer elements than us (Bob),
         we just send the count as Alice should send the first BF */
      send_element_count (op);
      op->phase = PHASE_COUNT_SENT;
    }
    else
    {
      /* We have fewer elements, so we start with the BF */
      begin_bf_exchange (op);
    }
  }
  /* Now allow CADET to continue, as we did not do this in
   #handle_incoming_msg (as we wanted to first see if the
     local client would accept the request). */
  GNUNET_CADET_receive_done (op->channel);
  GNUNET_SERVICE_client_continue (cs->client);
}

References advance_generation(), begin_bf_exchange(), ClientState::client, Listener::cs, Set::cs, Set::current_generation, get_incoming(), GNUNET_break, GNUNET_CADET_receive_done(), GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multihashmap_create(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_log, GNUNET_MESSAGE_TYPE_SETI_RESULT, GNUNET_MIN, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), GNUNET_SETI_STATUS_FAILURE, GNUNET_YES, ClientState::listener, ClientState::mq, msg, op, Listener::op_head, Listener::op_tail, Set::ops_head, Set::ops_tail, PHASE_COUNT_SENT, PHASE_INITIAL, GNUNET_SETI_ResultMessage::request_id, GNUNET_SETI_ResultMessage::result_status, send_element_count(), and ClientState::set.

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shutdown_task()

static void shutdown_task ( void *  cls )

static

Called to clean up, after a shutdown has been requested.

Parameters

cls	closure, NULL

Definition at line 2422 of file gnunet-service-seti.c.

{
  /* Delay actual shutdown to allow service to disconnect clients */
  in_shutdown = GNUNET_YES;
  if (0 == num_clients)
  {
    if (NULL != cadet)
    {
      GNUNET_CADET_disconnect (cadet);
      cadet = NULL;
    }
  }
  GNUNET_STATISTICS_destroy (_GSS_statistics,
                             GNUNET_YES);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "handled shutdown request\n");
}

References _GSS_statistics, cadet, GNUNET_CADET_disconnect(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_STATISTICS_destroy(), GNUNET_YES, in_shutdown, and num_clients.

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run()

static void run ( void *  cls, const struct GNUNET_CONFIGURATION_Handle *  cfg, struct GNUNET_SERVICE_Handle *  service  )

static

Function called by the service's run method to run service-specific setup code.

Parameters

cls	closure
cfg	configuration to use
service	the initialized service

Definition at line 2450 of file gnunet-service-seti.c.

{
  /* FIXME: need to modify SERVICE (!) API to allow
     us to run a shutdown task *after* clients were
     forcefully disconnected! */
  GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
                                 NULL);
  _GSS_statistics = GNUNET_STATISTICS_create ("seti",
                                              cfg);
  cadet = GNUNET_CADET_connect (cfg);
  if (NULL == cadet)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                _ ("Could not connect to CADET service\n"));
    GNUNET_SCHEDULER_shutdown ();
    return;
  }
}

References _, _GSS_statistics, cadet, cfg, GNUNET_CADET_connect(), GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), and shutdown_task.

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GNUNET_SERVICE_MAIN()

GNUNET_SERVICE_MAIN	(	GNUNET_OS_project_data_gnunet()	,
		"seti"	,
		GNUNET_SERVICE_OPTION_NONE	,
		&	run,
		&	client_connect_cb,
		&	client_disconnect_cb,
		NULL	,
		GNUNET_MQ_hd_fixed_size(client_accept, GNUNET_MESSAGE_TYPE_SETI_ACCEPT, struct GNUNET_SETI_AcceptMessage, NULL)	,
		GNUNET_MQ_hd_var_size(client_set_add, GNUNET_MESSAGE_TYPE_SETI_ADD, struct GNUNET_SETI_ElementMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_create_set, GNUNET_MESSAGE_TYPE_SETI_CREATE, struct GNUNET_SETI_CreateMessage, NULL)	,
		GNUNET_MQ_hd_var_size(client_evaluate, GNUNET_MESSAGE_TYPE_SETI_EVALUATE, struct GNUNET_SETI_EvaluateMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_listen, GNUNET_MESSAGE_TYPE_SETI_LISTEN, struct GNUNET_SETI_ListenMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_reject, GNUNET_MESSAGE_TYPE_SETI_REJECT, struct GNUNET_SETI_RejectMessage, NULL)	,
		GNUNET_MQ_hd_fixed_size(client_cancel, GNUNET_MESSAGE_TYPE_SETI_CANCEL, struct GNUNET_SETI_CancelMessage, NULL)	,
		GNUNET_MQ_handler_end()
	)

Define "main" method using service macro.

Variable Documentation

cadet

struct GNUNET_CADET_Handle* cadet

static

Handle to the cadet service, used to listen for and connect to remote peers.

Definition at line 472 of file gnunet-service-seti.c.

Referenced by client_disconnect_cb(), handle_client_evaluate(), handle_client_listen(), run(), and shutdown_task().

_GSS_statistics

struct GNUNET_STATISTICS_Handle* _GSS_statistics

static

Statistics handle.

Definition at line 477 of file gnunet-service-seti.c.

Referenced by fail_intersection_operation(), run(), send_bloomfilter(), send_client_done_and_destroy(), send_client_removed_element(), and shutdown_task().

listener_head

struct Listener* listener_head

static

Listeners are held in a doubly linked list.

Definition at line 482 of file gnunet-service-seti.c.

Referenced by client_disconnect_cb(), get_incoming(), and handle_client_listen().

listener_tail

struct Listener* listener_tail

static

Listeners are held in a doubly linked list.

Definition at line 487 of file gnunet-service-seti.c.

Referenced by client_disconnect_cb(), and handle_client_listen().

num_clients

unsigned int num_clients

static

Number of active clients.

Definition at line 492 of file gnunet-service-seti.c.

Referenced by client_connect_cb(), client_disconnect_cb(), and shutdown_task().

in_shutdown

int in_shutdown

static

Are we in shutdown? if GNUNET_YES and the number of clients drops to zero, disconnect from CADET.

Definition at line 498 of file gnunet-service-seti.c.

Referenced by client_disconnect_cb(), and shutdown_task().

suggest_id

uint32_t suggest_id

static

Counter for allocating unique IDs for clients, used to identify incoming operation requests from remote peers, that the client can choose to accept or refuse.

0 must not be used (reserved for uninitialized).

Definition at line 506 of file gnunet-service-seti.c.

Referenced by handle_incoming_msg().