/**
* Handle request connect message
*
* @param cls closure (always NULL)
* @param client identification of the client
* @param message the actual message
*/
static void
clients_handle_request_connect (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
const struct TransportRequestConnectMessage *trcm =
(const struct TransportRequestConnectMessage *) message;
GNUNET_STATISTICS_update (GST_stats,
gettext_noop
("# REQUEST CONNECT messages received"), 1,
GNUNET_NO);
if (0 == memcmp (&trcm->peer, &GST_my_identity,
sizeof (struct GNUNET_PeerIdentity)))
{
GNUNET_break_op (0);
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Received a request connect message myself `%s'\n",
GNUNET_i2s (&trcm->peer));
}
else
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received a request connect message for peer `%s'\n",
GNUNET_i2s (&trcm->peer));
(void) GST_blacklist_test_allowed (&trcm->peer, NULL, &try_connect_if_allowed,
NULL);
}
GNUNET_SERVER_receive_done (client, GNUNET_OK);
}
/**
* Do address validation again to keep address valid.
*
* @param cls the 'struct ValidationEntry'
* @param tc scheduler context (unused)
*/
static void
revalidate_address (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct ValidationEntry *ve = cls;
struct GNUNET_TIME_Relative canonical_delay;
struct GNUNET_TIME_Relative delay;
struct GST_BlacklistCheck *bc;
uint32_t rdelay;
ve->revalidation_task = GNUNET_SCHEDULER_NO_TASK;
delay = GNUNET_TIME_absolute_get_remaining (ve->revalidation_block);
/* How long until we can possibly permit the next PING? */
canonical_delay =
(ve->in_use ==
GNUNET_YES) ? CONNECTED_PING_FREQUENCY
: ((GNUNET_TIME_absolute_get_remaining (ve->valid_until).rel_value >
0) ? VALIDATED_PING_FREQUENCY : UNVALIDATED_PING_KEEPALIVE);
if (delay.rel_value > canonical_delay.rel_value * 2)
{
/* situation changed, recalculate delay */
delay = canonical_delay;
ve->revalidation_block = GNUNET_TIME_relative_to_absolute (delay);
}
if (delay.rel_value > 0)
{
/* should wait a bit longer */
ve->revalidation_task =
GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
return;
}
ve->revalidation_block = GNUNET_TIME_relative_to_absolute (canonical_delay);
/* schedule next PINGing with some extra random delay to avoid synchronous re-validations */
rdelay =
GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
canonical_delay.rel_value);
delay =
GNUNET_TIME_relative_add (canonical_delay,
GNUNET_TIME_relative_multiply
(GNUNET_TIME_UNIT_MILLISECONDS, rdelay));
ve->revalidation_task =
GNUNET_SCHEDULER_add_delayed (delay, &revalidate_address, ve);
/* start PINGing by checking blacklist */
GNUNET_STATISTICS_update (GST_stats,
gettext_noop ("# address revalidations started"), 1,
GNUNET_NO);
bc = GST_blacklist_test_allowed (&ve->pid, ve->address->transport_name,
&transmit_ping_if_allowed, ve);
if (NULL != bc)
ve->bc = bc; /* only set 'bc' if 'transmit_ping_if_allowed' was not already
* called... */
}
/**
* Plugin tells transport service about a new inbound session
*
* @param cls unused
* @param address the address
* @param session the new session
* @param scope network scope information
*/
static void
plugin_env_session_start (void *cls,
const struct GNUNET_HELLO_Address *address,
struct GNUNET_ATS_Session *session,
enum GNUNET_ATS_Network_Type scope)
{
struct GNUNET_ATS_Properties prop;
if (NULL == address)
{
GNUNET_break(0);
return;
}
if (NULL == session)
{
GNUNET_break(0);
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Notification from plugin `%s' about new session from peer `%s' address `%s'\n",
address->transport_name,
GNUNET_i2s (&address->peer),
GST_plugins_a2s (address));
if (GNUNET_YES ==
GNUNET_HELLO_address_check_option (address,
GNUNET_HELLO_ADDRESS_INFO_INBOUND))
{
/* inbound is always new, but outbound MAY already be known, but
for example for UNIX, we have symmetric connections and thus we
may not know the address yet; add if necessary! */
/* FIXME: maybe change API here so we just pass scope? */
memset (&prop, 0, sizeof (prop));
GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != scope);
prop.scope = scope;
GST_ats_add_inbound_address (address,
session,
&prop);
}
/* Do blacklist check if communication with this peer is allowed */
(void) GST_blacklist_test_allowed (&address->peer,
address->transport_name,
&plugin_env_session_start_bl_check_cont,
NULL,
address,
session);
}
/**
* Function called by the transport for each received message.
*
* @param cls closure, const char* with the name of the plugin we received the message from
* @param address address and (claimed) identity of the other peer
* @param message the message, NULL if we only care about
* learning about the delay until we should receive again
* @param session identifier used for this session (NULL for plugins
* that do not offer bi-directional communication to the sender
* using the same "connection")
* @return how long the plugin should wait until receiving more data
* (plugins that do not support this, can ignore the return value)
*/
struct GNUNET_TIME_Relative
GST_receive_callback (void *cls,
const struct GNUNET_HELLO_Address *address,
struct GNUNET_ATS_Session *session,
const struct GNUNET_MessageHeader *message)
{
const char *plugin_name = cls;
struct GNUNET_TIME_Relative ret;
uint16_t type;
ret = GNUNET_TIME_UNIT_ZERO;
if (NULL == message)
goto end;
type = ntohs (message->type);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received message with type %u from peer `%s'\n",
type,
GNUNET_i2s (&address->peer));
GNUNET_STATISTICS_update (GST_stats,
gettext_noop ("# bytes total received"),
ntohs (message->size),
GNUNET_NO);
GST_neighbours_notify_data_recv (address,
message);
switch (type)
{
case GNUNET_MESSAGE_TYPE_HELLO_LEGACY:
/* Legacy HELLO message, discard */
return ret;
case GNUNET_MESSAGE_TYPE_HELLO:
if (GNUNET_OK != GST_validation_handle_hello (message))
{
GNUNET_break_op (0);
GST_blacklist_abort_matching (address,
session);
}
return ret;
case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Processing PING from `%s'\n",
GST_plugins_a2s (address));
if (GNUNET_OK !=
GST_validation_handle_ping (&address->peer,
message,
address,
session))
{
GST_blacklist_abort_matching (address,
session);
kill_session (plugin_name,
session);
}
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
"Processing PONG from `%s'\n",
GST_plugins_a2s (address));
if (GNUNET_OK != GST_validation_handle_pong (&address->peer, message))
{
GNUNET_break_op (0);
GST_blacklist_abort_matching (address,
session);
kill_session (plugin_name, session);
}
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN:
/* Do blacklist check if communication with this peer is allowed */
(void) GST_blacklist_test_allowed (&address->peer,
NULL,
&connect_bl_check_cont,
GNUNET_copy_message (message),
address,
session);
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK:
if (GNUNET_OK !=
GST_neighbours_handle_session_syn_ack (message,
address,
session))
{
GST_blacklist_abort_matching (address, session);
kill_session (plugin_name, session);
}
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK:
if (GNUNET_OK !=
GST_neighbours_handle_session_ack (message,
address,
session))
{
GNUNET_break_op(0);
GST_blacklist_abort_matching (address, session);
kill_session (plugin_name, session);
}
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
GST_neighbours_handle_disconnect_message (&address->peer,
message);
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_QUOTA:
GST_neighbours_handle_quota_message (&address->peer,
message);
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
GST_neighbours_keepalive (&address->peer,
message);
break;
case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE:
GST_neighbours_keepalive_response (&address->peer,
message);
break;
default:
/* should be payload */
GNUNET_STATISTICS_update (GST_stats,
gettext_noop ("# bytes payload received"),
ntohs (message->size),
GNUNET_NO);
ret = process_payload (address,
session,
message);
break;
}
end:
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Allowing receive from peer %s to continue in %s\n",
GNUNET_i2s (&address->peer),
GNUNET_STRINGS_relative_time_to_string (ret,
GNUNET_YES));
return ret;
}
