/*
This file is part of GNUnet.
- (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
* @file transport/transport_api.c
* @brief library to access the low-level P2P IO service
* @author Christian Grothoff
+ *
+ * TODO:
+ * - adjust testcases to use new 'try connect' style (should be easy, breaks API compatibility!)
+ * - adjust core service to use new 'try connect' style (should be MUCH nicer there as well!)
+ * - test test test
*/
#include "platform.h"
#include "gnunet_bandwidth_lib.h"
#include "gnunet_transport_service.h"
#include "transport.h"
-/**
- * After how long do we give up on transmitting a HELLO
- * to the service?
- */
-#define OFFER_HELLO_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
-
-/**
- * After how long do we automatically retry an unsuccessful
- * CONNECT request?
- */
-#define CONNECT_RETRY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 750)
-
-/**
- * How long should ARM wait when starting up the
- * transport service before reporting back?
- */
-#define START_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
-
-/**
- * How long should ARM wait when stopping the
- * transport service before reporting back?
- */
-#define STOP_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
-
/**
* How large to start with for the hashmap of neighbours.
*/
-#define STARTING_NEIGHBOURS_SIZE 10
-
-
-/**
- * What stage are we in for transmission processing?
- */
-enum TransmitStage
- {
- /**
- * No active message.
- */
- TS_NEW = 0,
-
- /**
- * Message in local queue, not given to service.
- */
- TS_QUEUED = 1,
-
- /**
- * Message given to service, not confirmed (no SEND_OK).
- */
- TS_TRANSMITTED = 2,
-
- /**
- * One message was given to service and before it was confirmed,
- * another one was already queued (waiting for SEND_OK to pass on
- * to service).
- */
- TS_TRANSMITTED_QUEUED = 3
- };
+#define STARTING_NEIGHBOURS_SIZE 16
/**
- * Handle for a transmission-ready request.
+ * Handle for a message that should be transmitted to the service.
+ * Used for both control messages and normal messages.
*/
struct GNUNET_TRANSPORT_TransmitHandle
{
/**
- * Neighbour for this handle, NULL for control-traffic.
- */
- struct NeighbourList *neighbour;
-
- /**
- * Function to call when notify_size bytes are available
- * for transmission.
- */
- GNUNET_CONNECTION_TransmitReadyNotify notify;
-
- /**
- * Closure for notify.
- */
- void *notify_cls;
-
- /**
- * transmit_ready task Id. The task is used to introduce the
- * artificial delay that may be required to maintain the bandwidth
- * limits. Later, this will be the ID of the "transmit_timeout"
- * task which is used to signal a timeout if the transmission could
- * not be done in a timely fashion.
- */
- GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
-
- /**
- * Timeout for this request.
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * How many bytes is our notify callback waiting for?
- */
- size_t notify_size;
-
- /**
- * How important is this message?
- */
- uint32_t priority;
-
-};
-
-
-/**
- * Handle for a control message queue entry.
- */
-struct ControlMessage
-{
-
- /**
- * This is a doubly-linked list.
+ * We keep all requests in a DLL.
*/
- struct ControlMessage *next;
+ struct GNUNET_TRANSPORT_TransmitHandle *next;
/**
- * This is a doubly-linked list.
+ * We keep all requests in a DLL.
*/
- struct ControlMessage *prev;
+ struct GNUNET_TRANSPORT_TransmitHandle *prev;
/**
- * Overall transport handle.
+ * Neighbour for this handle, NULL for control messages.
*/
- struct GNUNET_TRANSPORT_Handle *h;
+ struct Neighbour *neighbour;
/**
* Function to call when notify_size bytes are available
void *notify_cls;
/**
- * transmit_ready task Id. The task is used to introduce the
- * artificial delay that may be required to maintain the bandwidth
- * limits. Later, this will be the ID of the "transmit_timeout"
- * task which is used to signal a timeout if the transmission could
- * not be done in a timely fashion.
+ * Timeout for this request, 0 for control messages.
*/
- GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
+ struct GNUNET_TIME_Absolute timeout;
/**
- * How many bytes is our notify callback waiting for?
+ * Task to trigger request timeout if the request is stalled due to
+ * congestion.
*/
- size_t notify_size;
-
-};
-
-/**
- * Context for storing information about attempted next transmission.
- */
-struct TryTransmitContext
-{
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
/**
- * Main transport handle.
+ * How many bytes is our notify callback waiting for?
*/
- struct GNUNET_TRANSPORT_Handle *h;
+ size_t notify_size;
/**
- * Returned transmission handle.
+ * How important is this message? Not used for control messages.
*/
- struct GNUNET_TRANSPORT_TransmitHandle *ret;
+ uint32_t priority;
- /**
- * Time to retry the send task.
- */
- struct GNUNET_TIME_Relative retry_time;
};
+
/**
* Entry in hash table of all of our current neighbours.
*/
-struct NeighbourList
+struct Neighbour
{
/**
* Overall transport handle.
struct GNUNET_TRANSPORT_Handle *h;
/**
- * Active transmit handle; available if 'transmit_forbidden'
- * is GNUNET_NO.
+ * Active transmit handle or NULL.
*/
- struct GNUNET_TRANSPORT_TransmitHandle transmit_handle;
+ struct GNUNET_TRANSPORT_TransmitHandle *th;
/**
* Identity of this neighbour.
struct GNUNET_BANDWIDTH_Tracker out_tracker;
/**
- * Set to GNUNET_NO if we are currently allowed to accept a
- * message to the transport service for this peer, GNUNET_YES
- * if we have one and are waiting for transmission, GNUNET_SYSERR
- * if we are waiting for confirmation AND have already accepted
- * yet another message.
- */
- enum TransmitStage transmit_stage;
-
- /**
- * Have we received a notification that this peer is connected
- * to us right now?
+ * Entry in our readyness heap (which is sorted by 'next_ready'
+ * value). NULL if there is no pending transmission request for
+ * this neighbour or if we're waiting for 'is_ready' to become
+ * true AFTER the 'out_tracker' suggested that this peer's quota
+ * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
+ * we should immediately go back into the heap).
*/
- int is_connected;
+ struct GNUNET_CONTAINER_HeapNode *hn;
/**
- * Are we in the middle of disconnecting the peer already?
+ * Is this peer currently ready to receive a message?
*/
- unsigned int in_disconnect;
+ int is_ready;
};
/**
- * Linked list of requests from clients for our HELLO that were
- * deferred.
+ * Linked list of functions to call whenever our HELLO is updated.
*/
struct HelloWaitList
{
/**
- * This is a linked list.
+ * This is a doubly linked list.
*/
struct HelloWaitList *next;
/**
- * Reference back to our transport handle.
+ * This is a doubly linked list.
*/
- struct GNUNET_TRANSPORT_Handle *handle;
+ struct HelloWaitList *prev;
/**
* Callback to call once we got our HELLO.
/**
* Head of DLL of control messages.
*/
- struct ControlMessage *control_head;
+ struct GNUNET_TRANSPORT_TransmitHandle *control_head;
/**
* Tail of DLL of control messages.
*/
- struct ControlMessage *control_tail;
+ struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
/**
* The current HELLO message for this peer. Updated
/**
* Handle to our registration with the client for notification.
*/
- struct GNUNET_CLIENT_TransmitHandle *network_handle;
+ struct GNUNET_CLIENT_TransmitHandle *cth;
/**
* Linked list of pending requests for our HELLO.
*/
struct HelloWaitList *hwl_head;
+ /**
+ * Linked list of pending requests for our HELLO.
+ */
+ struct HelloWaitList *hwl_tail;
+
/**
* My configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Linked list of the current neighbours of this peer.
+ * Hash map of the current connected neighbours of this peer.
+ * Maps peer identities to 'struct Neighbour' entries.
*/
struct GNUNET_CONTAINER_MultiHashMap *neighbours;
+ /**
+ * Heap sorting peers with pending messages by the timestamps that
+ * specify when we could next send a message to the respective peer.
+ * Excludes control messages (which can always go out immediately).
+ * Maps time stamps to 'struct Neighbour' entries.
+ */
+ struct GNUNET_CONTAINER_Heap *ready_heap;
+
/**
* Peer identity as assumed by this process, or all zeros.
*/
GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
/**
- * ID of the task trying to trigger transmission for a peer
- * while maintaining bandwidth quotas.
+ * ID of the task trying to trigger transmission for a peer while
+ * maintaining bandwidth quotas. In use if there are no control
+ * messages and the smallest entry in the 'ready_heap' has a time
+ * stamp in the future.
*/
GNUNET_SCHEDULER_TaskIdentifier quota_task;
*/
struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Set once we are in the process of disconnecting from the
- * service.
- */
- int in_disconnect;
-
/**
* Should we check that 'self' matches what the service thinks?
* (if GNUNET_NO, then 'self' is all zeros!).
int check_self;
};
-struct HelloContext
-{
-
- /**
- * Size of the HELLO copied to end of struct.
- */
- uint16_t size;
- /**
- * Continuation to call once HELLO sent.
- */
- GNUNET_SCHEDULER_Task cont;
+/**
+ * Schedule the task to send one message, either from the control
+ * list or the peer message queues to the service.
+ *
+ * @param h transport service to schedule a transmission for
+ */
+static void
+schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
- /**
- * Closure to call with the continuation.
- */
- void *cont_cls;
- /* HELLO */
-};
+/**
+ * Function that will schedule the job that will try
+ * to connect us again to the client.
+ *
+ * @param h transport service to reconnect
+ */
+static void
+disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
/**
* @param peer peer to look up
* @return NULL if no such peer entry exists
*/
-static struct NeighbourList *
+static struct Neighbour *
neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
const struct GNUNET_PeerIdentity *peer)
{
/**
- * Schedule the task to send one message, either from the control
- * list or the peer message queues to the service.
- */
-static void schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
-
-
-/**
- * Function called by the scheduler when the timeout for bandwidth
- * availablility for the target neighbour is reached.
+ * Add neighbour to our list
*
- * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
- * @param tc scheduler context
+ * @return NULL if this API is currently disconnecting from the service
*/
-static void
-quota_transmit_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+static struct Neighbour *
+neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
+ const struct GNUNET_PeerIdentity *pid)
{
- struct GNUNET_TRANSPORT_Handle *h = cls;
+ struct Neighbour *n;
- h->quota_task = GNUNET_SCHEDULER_NO_TASK;
- schedule_transmission (h);
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating entry for neighbour `%4s'.\n",
+ GNUNET_i2s (pid));
+#endif
+ n = GNUNET_malloc (sizeof (struct Neighbour));
+ n->id = *pid;
+ n->h = h;
+ n->is_ready = GNUNET_YES;
+ GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
+ GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
+ MAX_BANDWIDTH_CARRY_S);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (h->neighbours,
+ &pid->hashPubKey,
+ n,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return n;
}
/**
- * Iterator over hash map entries, attempt to schedule
- * a transmission to entries in the neighbour hashmap.
+ * Iterator over hash map entries, for deleting state of a neighbour.
*
- * @param cls closure a TryTransmitContext
- * @param key current key code
- * @param value value in the hash map, the neighbour entry to consider
+ * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
+ * @param key peer identity
+ * @param value value in the hash map, the neighbour entry to delete
* @return GNUNET_YES if we should continue to
* iterate,
* GNUNET_NO if not.
*/
static int
-try_schedule_transmission (void *cls,
- const GNUNET_HashCode * key,
- void *value)
+neighbour_delete (void *cls,
+ const GNUNET_HashCode * key,
+ void *value)
{
- struct NeighbourList *n = value;
- struct TryTransmitContext *try_transmit_ctx = cls;
- struct GNUNET_TIME_Relative duration;
- GNUNET_CONNECTION_TransmitReadyNotify notify;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct GNUNET_TIME_Absolute duration_abs;
-
- if (n->transmit_stage != TS_QUEUED)
- return GNUNET_YES; /* not eligible, keep iterating */
- if (n->is_connected != GNUNET_YES)
- return GNUNET_YES; /* keep iterating */
-
- th = &n->transmit_handle;
- GNUNET_break (n == th->neighbour);
- /* check outgoing quota */
- duration = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
- th->notify_size - sizeof (struct OutboundMessage));
- duration_abs = GNUNET_TIME_relative_to_absolute (duration);
- if (th->timeout.abs_value < duration_abs.abs_value)
- {
- /* signal timeout! */
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Would need %llu ms before bandwidth is available for delivery to `%4s', that is too long. Signaling timeout.\n",
- duration.rel_value,
- GNUNET_i2s (&n->id));
-#endif
- if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (th->notify_delay_task);
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- }
- n->transmit_stage = TS_NEW;
- if (NULL != (notify = th->notify))
- {
- th->notify = NULL;
- GNUNET_assert (0 == notify (th->notify_cls, 0, NULL));
- }
- return GNUNET_YES; /* keep iterating */
- }
- if (duration.rel_value > 0)
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Need more bandwidth (%u b/s allowed, %u b needed), delaying delivery to `%4s' by %llu ms\n",
- (unsigned int) n->out_tracker.available_bytes_per_s__,
- (unsigned int) th->notify_size - sizeof (struct OutboundMessage),
- GNUNET_i2s (&n->id),
- (unsigned long long) duration.rel_value);
-#endif
- try_transmit_ctx->retry_time = GNUNET_TIME_relative_min (try_transmit_ctx->retry_time,
- duration);
- return GNUNET_YES; /* keep iterating */
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Have %u bytes of bandwidth available for transmission to `%4s' right now\n",
- th->notify_size - sizeof (struct OutboundMessage),
- GNUNET_i2s (&n->id));
-#endif
-
- if ( (try_transmit_ctx->ret == NULL) ||
- (try_transmit_ctx->ret->priority < th->priority) )
- try_transmit_ctx->ret = th;
+ struct GNUNET_TRANSPORT_Handle *handle = cls;
+ struct Neighbour *n = value;
+
+ if (NULL != handle->nd_cb)
+ handle->nd_cb (handle->cls,
+ &n->id);
+ GNUNET_assert (NULL == n->th);
+ GNUNET_assert (NULL == n->hn);
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (handle->neighbours,
+ key,
+ n));
+ GNUNET_free (n);
return GNUNET_YES;
}
/**
- * Figure out which transmission to a peer can be done right now.
- * If none can, schedule a task to call 'schedule_transmission'
- * whenever a peer transmission can be done in the future and
- * return NULL. Otherwise return the next transmission to be
- * performed.
- *
- * @param h handle to transport
- * @return NULL to wait longer before doing any peer transmissions
- */
-static struct GNUNET_TRANSPORT_TransmitHandle *
-schedule_peer_transmission (struct GNUNET_TRANSPORT_Handle *h)
-{
- struct TryTransmitContext try_transmit_ctx;
-
- if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (h->quota_task);
- h->quota_task = GNUNET_SCHEDULER_NO_TASK;
- }
- try_transmit_ctx.h = h;
- try_transmit_ctx.ret = NULL;
- try_transmit_ctx.retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
- GNUNET_CONTAINER_multihashmap_iterate(h->neighbours,
- &try_schedule_transmission,
- &try_transmit_ctx);
- if (try_transmit_ctx.ret == NULL)
- h->quota_task = GNUNET_SCHEDULER_add_delayed (try_transmit_ctx.retry_time,
- "a_transmit_ready,
- h);
- return try_transmit_ctx.ret;
-}
-
-
-/**
- * Transmit message(s) to service.
+ * Function we use for handling incoming messages.
*
- * @param cls handle to transport
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
+ * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
+ * @param msg message received, NULL on timeout or fatal error
*/
-static size_t
-transport_notify_ready (void *cls, size_t size, void *buf)
+static void
+demultiplexer (void *cls,
+ const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_TRANSPORT_Handle *h = cls;
- struct ControlMessage *cm;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct NeighbourList *n;
- struct OutboundMessage obm;
- GNUNET_CONNECTION_TransmitReadyNotify notify;
- size_t ret;
- size_t mret;
- size_t nret;
- char *cbuf;
+ const struct DisconnectInfoMessage *dim;
+ const struct ConnectInfoMessage *cim;
+ const struct InboundMessage *im;
+ const struct GNUNET_MessageHeader *imm;
+ const struct SendOkMessage *okm;
+ struct HelloWaitList *hwl;
+ struct HelloWaitList *next_hwl;
+ struct Neighbour *n;
+ struct GNUNET_PeerIdentity me;
+ uint16_t size;
+ uint32_t ats_count;
- h->network_handle = NULL;
- if (buf == NULL)
+ GNUNET_assert (h->client != NULL);
+ if (msg == NULL)
{
- schedule_transmission (h);
- return 0;
- }
#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Ready to transmit %u bytes to transport service\n", size);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Error receiving from transport service, disconnecting temporarily.\n");
#endif
- cbuf = buf;
- ret = 0;
- while ( (NULL != (cm = h->control_head)) &&
- (cm->notify_size <= size) )
+ disconnect_and_schedule_reconnect (h);
+ return;
+ }
+ GNUNET_CLIENT_receive (h->client,
+ &demultiplexer, h,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ size = ntohs (msg->size);
+ switch (ntohs (msg->type))
{
- if (cm->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ case GNUNET_MESSAGE_TYPE_HELLO:
+ if (GNUNET_OK !=
+ GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
+ &me))
{
- GNUNET_SCHEDULER_cancel (cm->notify_delay_task);
- cm->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_break (0);
+ break;
}
- GNUNET_CONTAINER_DLL_remove (h->control_head,
- h->control_tail,
- cm);
- nret = cm->notify (cm->notify_cls, size, &cbuf[ret]);
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Added %u bytes of control message at %u\n",
- nret,
- ret);
+ "Receiving (my own) `%s' message, I am `%4s'.\n",
+ "HELLO", GNUNET_i2s (&me));
#endif
- GNUNET_free (cm);
- ret += nret;
- size -= nret;
- }
- while ( (NULL != (th = schedule_peer_transmission (h))) &&
- (th->notify_size <= size) )
- {
- if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_free_non_null (h->my_hello);
+ h->my_hello = NULL;
+ if (size < sizeof (struct GNUNET_MessageHeader))
{
- GNUNET_SCHEDULER_cancel (th->notify_delay_task);
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_break (0);
+ break;
}
- n = th->neighbour;
- switch (n->transmit_stage)
- {
- case TS_NEW:
- GNUNET_break (0);
- break;
- case TS_QUEUED:
- n->transmit_stage = TS_TRANSMITTED;
- break;
- case TS_TRANSMITTED:
- GNUNET_break (0);
- break;
- case TS_TRANSMITTED_QUEUED:
- GNUNET_break (0);
- break;
- default:
- GNUNET_break (0);
- }
- GNUNET_assert (size >= sizeof (struct OutboundMessage));
- notify = th->notify;
- th->notify = NULL;
- mret = notify (th->notify_cls,
- size - sizeof (struct OutboundMessage),
- &cbuf[ret + sizeof (struct OutboundMessage)]);
- GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Message of %u bytes with timeout %llums constructed for `%4s'\n",
- (unsigned int) mret,
- (unsigned long long) GNUNET_TIME_absolute_get_remaining (th->timeout).rel_value,
- GNUNET_i2s (&n->id));
-#endif
- if (mret != 0)
+ h->my_hello = GNUNET_malloc (size);
+ memcpy (h->my_hello, msg, size);
+ hwl = h->hwl_head;
+ while (NULL != hwl)
+ {
+ next_hwl = hwl->next;
+ hwl->rec (hwl->rec_cls,
+ (const struct GNUNET_MessageHeader *) h->my_hello);
+ hwl = next_hwl;
+ }
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
+ if (size < sizeof (struct ConnectInfoMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ cim = (const struct ConnectInfoMessage *) msg;
+ ats_count = ntohl (cim->ats_count);
+ if (size != sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information))
+ {
+ GNUNET_break (0);
+ break;
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Receiving `%s' message for `%4s'.\n",
+ "CONNECT", GNUNET_i2s (&cim->id));
+#endif
+ n = neighbour_find (h, &cim->id);
+ if (n != NULL)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ n = neighbour_add (h, &cim->id);
+ if (h->nc_cb != NULL)
+ h->nc_cb (h->cls, &n->id,
+ &cim->ats, ats_count);
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
+ if (size != sizeof (struct DisconnectInfoMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ dim = (const struct DisconnectInfoMessage *) msg;
+ GNUNET_break (ntohl (dim->reserved) == 0);
+#if DEBUG_TRANSPORT_DISCONNECT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Receiving `%s' message for `%4s'.\n",
+ "DISCONNECT",
+ GNUNET_i2s (&dim->peer));
+#endif
+ n = neighbour_find (h, &dim->peer);
+ if (n == NULL)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ neighbour_delete (h, &dim->peer.hashPubKey, n);
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
+ if (size != sizeof (struct SendOkMessage))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ okm = (const struct SendOkMessage *) msg;
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Receiving `%s' message, transmission %s.\n", "SEND_OK",
+ ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
+#endif
+ n = neighbour_find (h, &okm->peer);
+ if (n == NULL)
+ break;
+ GNUNET_break (GNUNET_NO == n->is_ready);
+ n->is_ready = GNUNET_YES;
+ if ( (n->th != NULL) &&
+ (n->hn == NULL) )
+ {
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
+ GNUNET_SCHEDULER_cancel (n->th->timeout_task);
+ n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ /* we've been waiting for this (congestion, not quota,
+ caused delayed transmission) */
+ n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap,
+ n, 0);
+ schedule_transmission (h);
+ }
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Receiving `%s' message.\n", "RECV");
+#endif
+ if (size <
+ sizeof (struct InboundMessage) +
+ sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break (0);
+ break;
+ }
+ im = (const struct InboundMessage *) msg;
+ GNUNET_break (0 == ntohl (im->reserved));
+ ats_count = ntohl(im->ats_count);
+ imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count+1]);
+
+ if (ntohs (imm->size) + sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
+ {
+ GNUNET_break (0);
+ break;
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message of type %u from `%4s'.\n",
+ ntohs (imm->type), GNUNET_i2s (&im->peer));
+#endif
+ n = neighbour_find (h, &im->peer);
+ if (n == NULL)
+ {
+ GNUNET_break (0);
+ break;
+ }
+ if (h->rec != NULL)
+ h->rec (h->cls, &im->peer, imm,
+ &im->ats, ats_count);
+ break;
+ default:
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _
+ ("Received unexpected message of type %u in %s:%u\n"),
+ ntohs (msg->type), __FILE__, __LINE__);
+ GNUNET_break (0);
+ break;
+ }
+}
+
+
+/**
+ * A transmission request could not be satisfied because of
+ * network congestion. Notify the initiator and clean up.
+ *
+ * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
+ * @param tc scheduler context
+ */
+static void
+timeout_request_due_to_congestion (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
+ struct Neighbour *n = th->neighbour;
+
+ n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (th == n->th);
+ GNUNET_assert (NULL == n->hn);
+ n->th = NULL;
+ th->notify (th->notify_cls, 0, NULL);
+ GNUNET_free (th);
+}
+
+
+/**
+ * Transmit message(s) to service.
+ *
+ * @param cls handle to transport
+ * @param size number of bytes available in buf
+ * @param buf where to copy the message
+ * @return number of bytes copied to buf
+ */
+static size_t
+transport_notify_ready (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_TRANSPORT_Handle *h = cls;
+ struct GNUNET_TRANSPORT_TransmitHandle *th;
+ struct Neighbour *n;
+ char *cbuf;
+ struct OutboundMessage obm;
+ size_t ret;
+ size_t nret;
+ size_t mret;
+
+ GNUNET_assert (NULL != h->client);
+ h->cth = NULL;
+ if (NULL == buf)
+ {
+ /* transmission failed */
+ disconnect_and_schedule_reconnect (h);
+ return 0;
+ }
+
+ cbuf = buf;
+ ret = 0;
+ /* first send control messages */
+ while ( (NULL != (th = h->control_head)) &&
+ (th->notify_size <= size) )
+ {
+ GNUNET_CONTAINER_DLL_remove (h->control_head,
+ h->control_tail,
+ th);
+ nret = th->notify (th->notify_cls, size, &cbuf[ret]);
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Added %u bytes of control message at %u\n",
+ nret,
+ ret);
+#endif
+ GNUNET_free (th);
+ ret += nret;
+ size -= nret;
+ }
+
+ /* then, if possible and no control messages pending, send data messages */
+ while ( (NULL == h->control_head) &&
+ (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) )
+ {
+ if (GNUNET_YES != n->is_ready)
+ {
+ /* peer not ready, wait for notification! */
+ GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
+ n->hn = NULL;
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
+ n->th->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (n->th->timeout),
+ &timeout_request_due_to_congestion,
+ n->th);
+ continue;
+ }
+ th = n->th;
+ if (th->notify_size + sizeof (struct OutboundMessage) > size)
+ break; /* does not fit */
+ if (GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, th->notify_size).rel_value > 0)
+ break; /* too early */
+ GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
+ n->hn = NULL;
+ n->th = NULL;
+ n->is_ready = GNUNET_NO;
+ GNUNET_assert (size >= sizeof (struct OutboundMessage));
+ mret = th->notify (th->notify_cls,
+ size - sizeof (struct OutboundMessage),
+ &cbuf[ret + sizeof (struct OutboundMessage)]);
+ GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
+ if (mret != 0)
{
GNUNET_assert (mret + sizeof (struct OutboundMessage) < GNUNET_SERVER_MAX_MESSAGE_SIZE);
obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
size -= (mret + sizeof (struct OutboundMessage));
GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
}
- else
- {
- switch (n->transmit_stage)
- {
- case TS_NEW:
- GNUNET_break (0);
- break;
- case TS_QUEUED:
- GNUNET_break (0);
- break;
- case TS_TRANSMITTED:
- n->transmit_stage = TS_NEW;
- break;
- case TS_TRANSMITTED_QUEUED:
- n->transmit_stage = TS_QUEUED;
- continue;
- default:
- GNUNET_break (0);
- }
- }
+ GNUNET_free (th);
}
+ /* if there are more pending messages, try to schedule those */
schedule_transmission (h);
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
/**
* Schedule the task to send one message, either from the control
* list or the peer message queues to the service.
+ *
+ * @param cls transport service to schedule a transmission for
+ * @param tc scheduler context
*/
static void
-schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
+schedule_transmission_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
{
+ struct GNUNET_TRANSPORT_Handle *h = cls;
size_t size;
- struct GNUNET_TIME_Relative timeout;
struct GNUNET_TRANSPORT_TransmitHandle *th;
+ struct Neighbour *n;
- if (NULL != h->network_handle)
- return;
- if (h->client == NULL)
+ h->quota_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_assert (NULL != h->client);
+ /* destroy all requests that have timed out */
+ while ( (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
+ (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0) )
{
+ /* notify client that the request could not be satisfied within
+ the given time constraints */
+ th = n->th;
+ n->th = NULL;
+ GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
+ n->hn = NULL;
+#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Could not yet schedule transmission: we are not yet connected to the transport service!\n"));
- return; /* not yet connected */
+ "Signalling timeout for transmission to peer %s due to congestion\n",
+ GNUNET_i2s (&n->id));
+#endif
+ GNUNET_assert (0 ==
+ th->notify (th->notify_cls, 0, NULL));
+ GNUNET_free (th);
}
+ if (NULL != h->cth)
+ return;
if (NULL != h->control_head)
{
size = h->control_head->notify_size;
- timeout = GNUNET_TIME_UNIT_FOREVER_REL;
}
else
{
- th = schedule_peer_transmission (h);
- if (th == NULL)
- {
- /* no transmission ready right now */
+ n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
+ if (NULL == n)
+ return; /* no pending messages */
+ size = n->th->notify_size + sizeof (struct OutboundMessage);
+ }
#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Could not yet schedule transmission: none ready\n");
-#endif
- return;
- }
- size = th->notify_size;
- timeout = GNUNET_TIME_absolute_get_remaining (th->timeout);
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Calling notify_transmit_ready\n");
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling notify_transmit_ready\n");
#endif
- h->network_handle =
+ h->cth =
GNUNET_CLIENT_notify_transmit_ready (h->client,
size,
- timeout,
+ GNUNET_TIME_UNIT_FOREVER_REL,
GNUNET_NO,
&transport_notify_ready,
h);
- GNUNET_assert (NULL != h->network_handle);
+ GNUNET_assert (NULL != h->cth);
}
/**
- * Called when our transmit request timed out before any transport
- * reported success connecting to the desired peer or before the
- * transport was ready to receive. Signal error and free
- * TransmitHandle.
+ * Schedule the task to send one message, either from the control
+ * list or the peer message queues to the service.
+ *
+ * @param h transport service to schedule a transmission for
*/
static void
-control_transmit_timeout (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
{
- struct ControlMessage *th = cls;
-
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- if (NULL != th->notify)
- th->notify (th->notify_cls, 0, NULL);
- GNUNET_CONTAINER_DLL_remove (th->h->control_head,
- th->h->control_tail,
- th);
- GNUNET_free (th);
+ struct GNUNET_TIME_Relative delay;
+ struct Neighbour *n;
+
+ GNUNET_assert (NULL != h->client);
+ if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (h->quota_task);
+ h->quota_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (NULL != h->control_head)
+ delay = GNUNET_TIME_UNIT_ZERO;
+ else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
+ delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, n->th->notify_size);
+ else
+ return; /* no work to be done */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling next transmission to service in %llu ms\n",
+ (unsigned long long) delay.rel_value);
+ h->quota_task = GNUNET_SCHEDULER_add_delayed (delay,
+ &schedule_transmission_task,
+ h);
}
*
* @param h handle to the transport service
* @param size number of bytes to be transmitted
- * @param at_head request must be added to the head of the queue
- * (otherwise request will be appended)
- * @param timeout how long this transmission can wait (at most)
* @param notify function to call to get the content
* @param notify_cls closure for notify
*/
static void
schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
size_t size,
- int at_head,
- struct GNUNET_TIME_Relative timeout,
GNUNET_CONNECTION_TransmitReadyNotify notify,
void *notify_cls)
{
- struct ControlMessage *cm;
+ struct GNUNET_TRANSPORT_TransmitHandle *th;
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Control transmit of %u bytes within %llums requested\n",
- size, (unsigned long long) timeout.rel_value);
+ "Control transmit of %u bytes requested\n",
+ size);
#endif
- cm = GNUNET_malloc (sizeof (struct ControlMessage));
- cm->h = h;
- cm->notify = notify;
- cm->notify_cls = notify_cls;
- cm->notify_size = size;
- cm->notify_delay_task
- = GNUNET_SCHEDULER_add_delayed (timeout, &control_transmit_timeout, cm);
- if (at_head)
- GNUNET_CONTAINER_DLL_insert (h->control_head,
- h->control_tail,
- cm);
- else
- GNUNET_CONTAINER_DLL_insert_after (h->control_head,
- h->control_tail,
- h->control_tail,
- cm);
+ th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
+ th->notify = notify;
+ th->notify_cls = notify_cls;
+ th->notify_size = size;
+ GNUNET_CONTAINER_DLL_insert_tail (h->control_head,
+ h->control_tail,
+ th);
schedule_transmission (h);
}
/**
- * FIXME: document
- */
-struct SetQuotaContext
-{
- /**
- * FIXME: document
- */
- struct GNUNET_TRANSPORT_Handle *handle;
-
- /**
- * FIXME: document
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * FIXME: document
- */
- GNUNET_SCHEDULER_Task cont;
-
- /**
- * Closure for 'cont'.
- */
- void *cont_cls;
-
- /**
- * FIXME: document
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * FIXME: document
- */
- struct GNUNET_BANDWIDTH_Value32NBO quota_in;
-};
-
-
-/**
- * Send SET_QUOTA message to the service.
+ * Transmit START message to service.
*
- * @param cls the 'struct SetQuotaContext'
+ * @param cls unused
* @param size number of bytes available in buf
* @param buf where to copy the message
* @return number of bytes copied to buf
*/
static size_t
-send_set_quota (void *cls, size_t size, void *buf)
+send_start (void *cls, size_t size, void *buf)
{
- struct SetQuotaContext *sqc = cls;
- struct QuotaSetMessage *msg;
+ struct GNUNET_TRANSPORT_Handle *h = cls;
+ struct StartMessage s;
if (buf == NULL)
{
- if (sqc->cont != NULL)
- GNUNET_SCHEDULER_add_continuation (sqc->cont,
- sqc->cont_cls,
- GNUNET_SCHEDULER_REASON_TIMEOUT);
- GNUNET_free (sqc);
- return 0;
- }
+ /* Can only be shutdown, just give up */
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Shutdown while trying to transmit `%s' request.\n",
+ "START");
+#endif
+ return 0;
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting `%s' request.\n", "START");
+#endif
+ GNUNET_assert (size >= sizeof (struct StartMessage));
+ s.header.size = htons (sizeof (struct StartMessage));
+ s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
+ s.do_check = htonl (h->check_self);
+ s.self = h->self;
+ memcpy (buf, &s, sizeof (struct StartMessage));
+ GNUNET_CLIENT_receive (h->client,
+ &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
+ return sizeof (struct StartMessage);
+}
+
+
+/**
+ * Try again to connect to transport service.
+ *
+ * @param cls the handle to the transport service
+ * @param tc scheduler context
+ */
+static void
+reconnect (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_TRANSPORT_Handle *h = cls;
+
+ h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
+ if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ {
+ /* shutdown, just give up */
+ return;
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Connecting to transport service.\n");
+#endif
+ GNUNET_assert (h->client == NULL);
+ GNUNET_assert (h->control_head == NULL);
+ GNUNET_assert (h->control_tail == NULL);
+ h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
+ GNUNET_assert (h->client != NULL);
+ schedule_control_transmit (h,
+ sizeof (struct StartMessage),
+ &send_start, h);
+}
+
+
+/**
+ * Function that will schedule the job that will try
+ * to connect us again to the client.
+ *
+ * @param h transport service to reconnect
+ */
+static void
+disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
+{
+ struct GNUNET_TRANSPORT_TransmitHandle *th;
+
+ GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
+ /* Forget about all neighbours that we used to be connected to */
+ GNUNET_CONTAINER_multihashmap_iterate(h->neighbours,
+ &neighbour_delete,
+ h);
+ if (NULL != h->cth)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
+ h->cth = NULL;
+ }
+ if (NULL != h->client)
+ {
+ GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
+ h->client = NULL;
+ }
+ if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (h->quota_task);
+ h->quota_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ while ( (NULL != (th = h->control_head)))
+ {
+ GNUNET_CONTAINER_DLL_remove (h->control_head,
+ h->control_tail,
+ th);
+ th->notify (th->notify_cls, 0, NULL);
+ GNUNET_free (th);
+ }
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling task to reconnect to transport service in %llu ms.\n",
+ h->reconnect_delay.rel_value);
+#endif
+ h->reconnect_task
+ = GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
+ &reconnect, h);
+ if (h->reconnect_delay.rel_value == 0)
+ {
+ h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+ }
+ else
+ {
+ h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
+ h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
+ h->reconnect_delay);
+ }
+}
+
+
+/**
+ * Closure for 'send_set_quota'.
+ */
+struct SetQuotaContext
+{
+
+ /**
+ * Identity of the peer impacted by the quota change.
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Quota to transmit.
+ */
+ struct GNUNET_BANDWIDTH_Value32NBO quota_in;
+};
+
+
+/**
+ * Send SET_QUOTA message to the service.
+ *
+ * @param cls the 'struct SetQuotaContext'
+ * @param size number of bytes available in buf
+ * @param buf where to copy the message
+ * @return number of bytes copied to buf
+ */
+static size_t
+send_set_quota (void *cls, size_t size, void *buf)
+{
+ struct SetQuotaContext *sqc = cls;
+ struct QuotaSetMessage msg;
+
+ if (buf == NULL)
+ {
+ GNUNET_free (sqc);
+ return 0;
+ }
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Transmitting `%s' request with respect to `%4s'.\n",
GNUNET_i2s (&sqc->target));
#endif
GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
- msg = buf;
- msg->header.size = htons (sizeof (struct QuotaSetMessage));
- msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
- msg->quota = sqc->quota_in;
- memcpy (&msg->peer, &sqc->target, sizeof (struct GNUNET_PeerIdentity));
- if (sqc->cont != NULL)
- GNUNET_SCHEDULER_add_continuation (sqc->cont,
- sqc->cont_cls,
- GNUNET_SCHEDULER_REASON_PREREQ_DONE);
+ msg.header.size = htons (sizeof (struct QuotaSetMessage));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
+ msg.quota = sqc->quota_in;
+ msg.peer = sqc->target;
+ memcpy (buf, &msg, sizeof (msg));
GNUNET_free (sqc);
return sizeof (struct QuotaSetMessage);
}
struct GNUNET_BANDWIDTH_Value32NBO quota_in,
struct GNUNET_BANDWIDTH_Value32NBO quota_out)
{
- struct NeighbourList *n;
+ struct Neighbour *n;
struct SetQuotaContext *sqc;
-
+
n = neighbour_find (handle, target);
- if (n != NULL)
- {
-#if DEBUG_TRANSPORT
- if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Quota changed from %u to %u for peer `%s'\n",
- (unsigned int) n->out_tracker.available_bytes_per_s__,
- (unsigned int) ntohl (quota_out.value__),
- GNUNET_i2s (target));
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Quota remains at %u for peer `%s'\n",
- (unsigned int) n->out_tracker.available_bytes_per_s__,
- GNUNET_i2s (target));
-#endif
- GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
- quota_out);
- }
- else
+ if (NULL == n)
{
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Quota changed to %u for peer `%s', but I have no such neighbour!\n",
(unsigned int) ntohl (quota_out.value__),
GNUNET_i2s (target));
-#endif
+ return;
}
+ GNUNET_assert (NULL != handle->client);
+#if DEBUG_TRANSPORT
+ if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Quota changed from %u to %u for peer `%s'\n",
+ (unsigned int) n->out_tracker.available_bytes_per_s__,
+ (unsigned int) ntohl (quota_out.value__),
+ GNUNET_i2s (target));
+ else
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Quota remains at %u for peer `%s'\n",
+ (unsigned int) n->out_tracker.available_bytes_per_s__,
+ GNUNET_i2s (target));
+#endif
+ GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
+ quota_out);
sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
- sqc->handle = handle;
sqc->target = *target;
- sqc->cont = NULL;
- sqc->cont_cls = NULL;
- sqc->timeout = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_FOREVER_REL);
sqc->quota_in = quota_in;
schedule_control_transmit (handle,
sizeof (struct QuotaSetMessage),
- GNUNET_NO,
- GNUNET_TIME_UNIT_FOREVER_REL, &send_set_quota, sqc);
-}
-
-
-/**
- * Ask the transport service to establish a connection to
- * the given peer.
- *
- * @param handle connection to transport service
- * @param target who we should try to connect to
- */
-void
-GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target)
-{
- /* old API does nothing */
+ &send_set_quota, sqc);
}
-
-
/**
- * Obtain the HELLO message for this peer.
+ * Send REQUEST_CONNECT message to the service.
*
- * @param handle connection to transport service
- * @param rec function to call with the HELLO, sender will be our peer
- * identity; message and sender will be NULL on timeout
- * (handshake with transport service pending/failed).
- * cost estimate will be 0.
- * @param rec_cls closure for rec
+ * @param cls the 'struct GNUNET_PeerIdentity'
+ * @param size number of bytes available in buf
+ * @param buf where to copy the message
+ * @return number of bytes copied to buf
*/
-void
-GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls)
+static size_t
+send_try_connect (void *cls, size_t size, void *buf)
{
- struct HelloWaitList *hwl;
+ struct GNUNET_PeerIdentity *pid = cls;
+ struct TransportRequestConnectMessage msg;
- hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
- hwl->next = handle->hwl_head;
- handle->hwl_head = hwl;
- hwl->handle = handle;
- hwl->rec = rec;
- hwl->rec_cls = rec_cls;
- if (handle->my_hello == NULL)
+ if (buf == NULL)
{
-#if DEBUG_TRANSPORT_HELLO
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "No HELLO yet, waiting to receive it from transport service\n");
-#endif
- return;
+ GNUNET_free (pid);
+ return 0;
}
- rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting `%s' request with respect to `%4s'.\n",
+ "REQUEST_CONNECT",
+ GNUNET_i2s (pid));
+#endif
+ GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
+ msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
+ msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
+ msg.reserved = htonl (0);
+ msg.peer = *pid;
+ memcpy (buf, &msg, sizeof (msg));
+ GNUNET_free (pid);
+ return sizeof (struct TransportRequestConnectMessage);
}
-
/**
- * Stop receiving updates about changes to our HELLO message.
+ * Ask the transport service to establish a connection to
+ * the given peer.
*
* @param handle connection to transport service
- * @param rec function previously registered to be called with the HELLOs
- * @param rec_cls closure for rec
+ * @param target who we should try to connect to
*/
void
-GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls)
+GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
+ const struct GNUNET_PeerIdentity *target)
{
- struct HelloWaitList *pos;
- struct HelloWaitList *prev;
+ struct GNUNET_PeerIdentity *pid;
- prev = NULL;
- pos = handle->hwl_head;
- while (pos != NULL)
- {
- if ( (pos->rec == rec) &&
- (pos->rec_cls == rec_cls) )
- break;
- prev = pos;
- pos = pos->next;
- }
- GNUNET_break (pos != NULL);
- if (pos == NULL)
+ if (NULL == handle->client)
return;
- if (prev == NULL)
- handle->hwl_head = pos->next;
- else
- prev->next = pos->next;
- GNUNET_free (pos);
+ pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
+ *pid = *target;
+ schedule_control_transmit (handle,
+ sizeof (struct TransportRequestConnectMessage),
+ &send_try_connect, pid);
}
static size_t
send_hello (void *cls, size_t size, void *buf)
{
- struct HelloContext *hc = cls;
+ struct GNUNET_MessageHeader *msg = cls;
uint16_t ssize;
+
if (buf == NULL)
{
#if DEBUG_TRANSPORT_TIMEOUT
"Timeout while trying to transmit `%s' request.\n",
"HELLO");
#endif
- if (NULL != hc->cont)
- GNUNET_SCHEDULER_add_now(hc->cont, hc->cont_cls);
- GNUNET_free (hc);
+ GNUNET_free (msg);
return 0;
}
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Transmitting `%s' request.\n", "HELLO");
#endif
- GNUNET_assert (size >= hc->size);
- memcpy (buf, &hc[1], hc->size);
-
- if (hc->cont != NULL)
- {
- GNUNET_SCHEDULER_add_continuation(hc->cont, hc->cont_cls, GNUNET_SCHEDULER_REASON_PREREQ_DONE);
- }
- ssize = hc->size;
- GNUNET_free (hc);
+ ssize = ntohs (msg->size);
+ GNUNET_assert (size >= ssize);
+ memcpy (buf, msg, ssize);
+ GNUNET_free (msg);
return ssize;
}
{
uint16_t size;
struct GNUNET_PeerIdentity peer;
- struct HelloContext *hc;
+ struct GNUNET_MessageHeader *msg;
+ if (NULL == handle->client)
+ return;
GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
size = ntohs (hello->size);
GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
GNUNET_break (0);
return;
}
- hc = GNUNET_malloc(sizeof(struct HelloContext) + size);
- hc->size = size;
- hc->cont = cont;
- hc->cont_cls = cls;
- memcpy (&hc[1], hello, size);
-
+ msg = GNUNET_malloc(size);
+ memcpy (msg, hello, size);
#if DEBUG_TRANSPORT
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Offering `%s' message of `%4s' to transport for validation.\n",
"HELLO",
GNUNET_i2s (&peer));
#endif
-
schedule_control_transmit (handle,
size,
- GNUNET_NO, OFFER_HELLO_TIMEOUT, &send_hello, hc);
+ &send_hello, msg);
}
/**
- * Transmit START message to service.
+ * Obtain the HELLO message for this peer.
*
- * @param cls unused
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
+ * @param handle connection to transport service
+ * @param rec function to call with the HELLO, sender will be our peer
+ * identity; message and sender will be NULL on timeout
+ * (handshake with transport service pending/failed).
+ * cost estimate will be 0.
+ * @param rec_cls closure for rec
*/
-static size_t
-send_start (void *cls, size_t size, void *buf)
+void
+GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
+ GNUNET_TRANSPORT_HelloUpdateCallback rec,
+ void *rec_cls)
{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- struct StartMessage s;
+ struct HelloWaitList *hwl;
- if (buf == NULL)
- {
- /* Can only be shutdown, just give up */
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Shutdown while trying to transmit `%s' request.\n",
- "START");
-#endif
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request.\n", "START");
-#endif
- GNUNET_assert (size >= sizeof (struct StartMessage));
- s.header.size = htons (sizeof (struct StartMessage));
- s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
- s.do_check = htonl (h->check_self);
- s.self = h->self;
- memcpy (buf, &s, sizeof (struct StartMessage));
- return sizeof (struct StartMessage);
-}
-
-
-/**
- * Free neighbour.
- *
- * @param n the entry to free
- */
-static void
-neighbour_free (struct NeighbourList *n)
-{
- struct GNUNET_TRANSPORT_Handle *h;
-
- /* Added so task gets canceled when a disconnect is received! */
- /* Method 1
- if (n->transmit_handle.notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel(n->transmit_handle.notify_delay_task);
- n->transmit_handle.notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- n->transmit_handle.notify = NULL;
- }
- */
- /* NATE: if the above is not needed, then clearly this assertion
- should hold (I've checked the code and I'm pretty sure this is
- true. -CG
- FIXME: remove above comments once we've seen tests pass with the assert... */
- GNUNET_assert (n->transmit_handle.notify_delay_task == GNUNET_SCHEDULER_NO_TASK);
- GNUNET_assert (n->transmit_handle.notify == NULL);
- h = n->h;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Removing neighbour `%s' from list of connected peers.\n",
- GNUNET_i2s (&n->id));
-#endif
- GNUNET_break (n->is_connected == GNUNET_NO);
- GNUNET_break (n->transmit_stage == TS_NEW);
-
- GNUNET_assert(GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove(h->neighbours,
- &n->id.hashPubKey,
- n));
- GNUNET_free (n);
-}
-
-
-/**
- * Mark neighbour as disconnected.
- *
- * @param n the entry to mark as disconnected
- */
-static void
-neighbour_disconnect (struct NeighbourList *n)
-{
- struct GNUNET_TRANSPORT_Handle *h = n->h;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Removing neighbour `%s' from list of connected peers.\n",
- GNUNET_i2s (&n->id));
-#endif
- GNUNET_break (n->is_connected == GNUNET_YES);
- n->is_connected = GNUNET_NO;
- /* FIXME: this 'in_disconnect' flag is dubious; we should define
- clearly what disconnect means for pending 'notify_transmit_ready'
- requests; maybe a good approach is to REQUIRE clients to
- call 'notify_transmit_ready_cancel' on pending requests on disconnect
- and otherwise FAIL HARD with an assertion failure before
- 'neighbour_free' right here (transmit_stage would be forced
- to 'TS_NEW') */
- n->in_disconnect = GNUNET_YES;
- if (h->nd_cb != NULL)
- h->nd_cb (h->cls, &n->id);
- if (n->transmit_stage == TS_NEW)
- neighbour_free (n);
-}
-
-
-/**
- * Function we use for handling incoming messages.
- *
- * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
- * @param msg message received, NULL on timeout or fatal error
- */
-static void demultiplexer (void *cls,
- const struct GNUNET_MessageHeader *msg);
-
-
-/**
- * Iterator over hash map entries, for getting rid of a neighbor
- * upon a reconnect call.
- *
- * @param cls closure (NULL)
- * @param key current key code
- * @param value value in the hash map, the neighbour entry to forget
- * @return GNUNET_YES if we should continue to
- * iterate,
- * GNUNET_NO if not.
- */
-static int
-forget_neighbours (void *cls,
- const GNUNET_HashCode * key,
- void *value)
-{
- struct NeighbourList *n = value;
-
-#if DEBUG_TRANSPORT_DISCONNECT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting due to reconnect being called\n");
-#endif
- if (n->is_connected)
- neighbour_disconnect (n);
-
- return GNUNET_YES;
-}
-
-
-/**
- * Try again to connect to transport service.
- *
- * @param cls the handle to the transport service
- * @param tc scheduler context
- */
-static void
-reconnect (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- struct ControlMessage *pos;
-
- h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- {
- /* shutdown, just give up */
- return;
- }
- /* Forget about all neighbours that we used to be connected to */
- GNUNET_CONTAINER_multihashmap_iterate(h->neighbours,
- &forget_neighbours,
- NULL);
-
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connecting to transport service.\n");
-#endif
- GNUNET_assert (h->client == NULL);
- h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
- GNUNET_assert (h->client != NULL);
- /* make sure we don't send "START" twice, remove existing entry from
- queue (if present) */
- pos = h->control_head;
- while (pos != NULL)
- {
- if (pos->notify == &send_start)
- {
- GNUNET_CONTAINER_DLL_remove (h->control_head,
- h->control_tail,
- pos);
- if (GNUNET_SCHEDULER_NO_TASK != pos->notify_delay_task)
- {
- GNUNET_SCHEDULER_cancel (pos->notify_delay_task);
- pos->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free (pos);
- break;
- }
- pos = pos->next;
- }
- schedule_control_transmit (h,
- sizeof (struct StartMessage),
- GNUNET_YES,
- GNUNET_TIME_UNIT_FOREVER_REL, &send_start, h);
- GNUNET_CLIENT_receive (h->client,
- &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
-}
-
-
-/**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param h transport service to reconnect
- */
-static void
-schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
-{
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling task to reconnect to transport service in %llu ms.\n",
- h->reconnect_delay.rel_value);
-#endif
- GNUNET_assert (h->client == NULL);
- GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
- h->reconnect_task
- = GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
- if (h->reconnect_delay.rel_value == 0)
- {
- h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
- }
- else
- {
- h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
- h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
- h->reconnect_delay);
- }
-}
-
-
-/**
- * Send request connect message to the service.
- *
- * @param cls the TransportRequestConnectMessage
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_transport_request_connect (void *cls, size_t size, void *buf)
-{
- struct TransportRequestConnectMessage *trcm = cls;
-
- if (buf == NULL)
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Buffer null for %s\n",
- "REQUEST_CONNECT");
-#endif
- GNUNET_free (trcm);
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request for `%4s'.\n",
- "REQUEST_CONNECT",
- GNUNET_i2s (&trcm->peer));
-#endif
- GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
- memcpy(buf, trcm, sizeof(struct TransportRequestConnectMessage));
- GNUNET_free (trcm);
- return sizeof(struct TransportRequestConnectMessage);
-}
-
-/**
- * Create and send a request connect message to
- * the transport service for a particular peer.
- *
- * @param h handle to the transport service
- * @param n the neighbor to send the request connect message about
- *
- */
-static void
-send_request_connect_message(struct GNUNET_TRANSPORT_Handle *h, struct NeighbourList *n)
-{
- struct TransportRequestConnectMessage *trcm;
-
- trcm = GNUNET_malloc(sizeof(struct TransportRequestConnectMessage));
- trcm->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
- trcm->header.size = htons(sizeof(struct TransportRequestConnectMessage));
- memcpy(&trcm->peer, &n->id, sizeof(struct GNUNET_PeerIdentity));
- schedule_control_transmit (h,
- sizeof (struct TransportRequestConnectMessage),
- GNUNET_NO,
- GNUNET_TIME_UNIT_FOREVER_REL, &send_transport_request_connect, trcm);
-}
-
-
-/**
- * Add neighbour to our list
- *
- * @return NULL if this API is currently disconnecting from the service
- */
-static struct NeighbourList *
-neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
- const struct GNUNET_PeerIdentity *pid)
-{
- struct NeighbourList *n;
-
- if (GNUNET_YES == h->in_disconnect)
- return NULL;
- /* check for duplicates */
- if (NULL != (n = neighbour_find (h, pid)))
- {
- GNUNET_break (0);
- return n;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating entry for neighbour `%4s'.\n",
- GNUNET_i2s (pid));
-#endif
- n = GNUNET_malloc (sizeof (struct NeighbourList));
- n->id = *pid;
- n->h = h;
- GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
- GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
- MAX_BANDWIDTH_CARRY_S);
- GNUNET_CONTAINER_multihashmap_put (h->neighbours,
- &pid->hashPubKey,
- n,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
-
- return n;
-}
-
-
-/**
- * Iterator over hash map entries, for deleting state of a neighbor.
- *
- * @param cls closure (NULL)
- * @param key current key code
- * @param value value in the hash map, the neighbour entry to delete
- * @return GNUNET_YES if we should continue to
- * iterate,
- * GNUNET_NO if not.
- */
-static int
-delete_neighbours (void *cls,
- const GNUNET_HashCode * key,
- void *value)
-{
- struct NeighbourList *n = value;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
-
- switch (n->transmit_stage)
- {
- case TS_NEW:
- case TS_TRANSMITTED:
- /* nothing to do */
- break;
- case TS_QUEUED:
- case TS_TRANSMITTED_QUEUED:
- th = &n->transmit_handle;
- if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (th->notify_delay_task);
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
- break;
- default:
- GNUNET_break (0);
- }
- GNUNET_free (n);
- return GNUNET_YES;
-}
-
-
-/**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
- *
- * @param cfg configuration to use
- * @param self our own identity (API should check that it matches
- * the identity found by transport), or NULL (no check)
- * @param cls closure for the callbacks
- * @param rec receive function to call
- * @param nc function to call on connect events
- * @param nd function to call on disconnect events
- */
-struct GNUNET_TRANSPORT_Handle *
-GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_PeerIdentity *self,
- void *cls,
- GNUNET_TRANSPORT_ReceiveCallback rec,
- GNUNET_TRANSPORT_NotifyConnect nc,
- GNUNET_TRANSPORT_NotifyDisconnect nd)
-{
- struct GNUNET_TRANSPORT_Handle *ret;
-
- ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
- if (self != NULL)
- {
- ret->self = *self;
- ret->check_self = GNUNET_YES;
- }
- ret->cfg = cfg;
- ret->cls = cls;
- ret->rec = rec;
- ret->nc_cb = nc;
- ret->nd_cb = nd;
- ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
- ret->neighbours = GNUNET_CONTAINER_multihashmap_create(STARTING_NEIGHBOURS_SIZE);
- schedule_reconnect (ret);
- return ret;
-}
-
-
-/**
- * Disconnect from the transport service.
- */
-void
-GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
-{
- struct HelloWaitList *hwl;
- struct GNUNET_CLIENT_Connection *client;
- struct ControlMessage *cm;
-
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
-#endif
- /* FIXME: this flag is dubious, we should be able to do this
- more cleanly; also, we should probably do 'disconnect'
- callbacks for every connected peer here, i.e. by calling
- the iterator with 'forget_neighbours' instead of 'delete_neighbours'.
- */
-
- handle->in_disconnect = GNUNET_YES;
-
- GNUNET_assert (GNUNET_SYSERR !=
- GNUNET_CONTAINER_multihashmap_iterate(handle->neighbours,
- &delete_neighbours,
- handle));
- GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
-
- while (NULL != (hwl = handle->hwl_head))
- {
- handle->hwl_head = hwl->next;
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _
- ("Disconnect while notification for `%s' still registered.\n"),
- "HELLO");
- if (hwl->rec != NULL)
- hwl->rec (hwl->rec_cls, NULL);
- GNUNET_free (hwl);
- }
-
- /* Check for still scheduled control messages, cancel delay tasks if so */
- /* Added because somehow a notify_delay_task is remaining scheduled and is ever so annoying */
- while ( (NULL != (cm = handle->control_head)))
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnect before control message sent!\n");
-#endif
- if (cm->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (cm->notify_delay_task);
- cm->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_CONTAINER_DLL_remove (handle->control_head,
- handle->control_tail,
- cm);
- GNUNET_free (cm);
- }
- /* end check */
-
- if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (handle->reconnect_task);
- handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (handle->quota_task);
- handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free_non_null (handle->my_hello);
- handle->my_hello = NULL;
-
- if (NULL != handle->network_handle)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (handle->network_handle);
- handle->network_handle = NULL;
- }
- if (NULL != (client = handle->client))
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Disconnecting from transport service for good.\n");
-#endif
- handle->client = NULL;
- GNUNET_CLIENT_disconnect (client, GNUNET_YES);
- }
- GNUNET_free (handle);
-}
-
-
-/**
- * Function we use for handling incoming messages.
- *
- * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
- * @param msg message received, NULL on timeout or fatal error
- */
-static void
-demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- const struct DisconnectInfoMessage *dim;
- const struct ConnectInfoMessage *cim;
- const struct InboundMessage *im;
- const struct GNUNET_MessageHeader *imm;
- const struct SendOkMessage *okm;
- struct HelloWaitList *hwl;
- struct HelloWaitList *next_hwl;
- struct NeighbourList *n;
- struct GNUNET_PeerIdentity me;
- uint16_t size;
- uint32_t ats_count;
-
- if (h->client == NULL)
- {
- /* shutdown initiated from 'GNUNET_TRANSPORT_disconnect',
- finish clean up work! */
- GNUNET_free (h);
- return;
- }
- if (msg == NULL)
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Error receiving from transport service, disconnecting temporarily.\n");
-#endif
- if (h->network_handle != NULL)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->network_handle);
- h->network_handle = NULL;
- }
- GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
- h->client = NULL;
- schedule_reconnect (h);
- return;
- }
- GNUNET_CLIENT_receive (h->client,
- &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
- size = ntohs (msg->size);
- switch (ntohs (msg->type))
- {
- case GNUNET_MESSAGE_TYPE_HELLO:
- if (GNUNET_OK !=
- GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
- &me))
- {
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving (my own) `%s' message, I am `%4s'.\n",
- "HELLO", GNUNET_i2s (&me));
-#endif
- GNUNET_free_non_null (h->my_hello);
- h->my_hello = NULL;
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- break;
- }
- h->my_hello = GNUNET_malloc (size);
- memcpy (h->my_hello, msg, size);
- hwl = h->hwl_head;
- while (NULL != hwl)
- {
- next_hwl = hwl->next;
- hwl->rec (hwl->rec_cls,
- (const struct GNUNET_MessageHeader *) h->my_hello);
- hwl = next_hwl;
- }
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
- if (size < sizeof (struct ConnectInfoMessage))
- {
- GNUNET_break (0);
- break;
- }
- cim = (const struct ConnectInfoMessage *) msg;
- ats_count = ntohl (cim->ats_count);
- if (size != sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information))
- {
- GNUNET_break (0);
- break;
- }
- if (0 == memcmp (&cim->id,
- &h->self,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- /* connect to self!? */
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message for `%4s'.\n",
- "CONNECT", GNUNET_i2s (&cim->id));
-#endif
- n = neighbour_find (h, &cim->id);
- if (n == NULL)
- n = neighbour_add (h, &cim->id);
- if (n == NULL)
- return;
- GNUNET_break (n->is_connected == GNUNET_NO);
- n->is_connected = GNUNET_YES;
- /* FIXME */
- if (h->nc_cb != NULL)
- h->nc_cb (h->cls, &n->id,
- &cim->ats,ats_count);
- /* FIXEND */
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
- if (size != sizeof (struct DisconnectInfoMessage))
- {
- GNUNET_break (0);
- break;
- }
- dim = (const struct DisconnectInfoMessage *) msg;
- GNUNET_break (ntohl (dim->reserved) == 0);
- if (0 == memcmp (&dim->peer,
- &h->self,
- sizeof (struct GNUNET_PeerIdentity)))
- {
- /* discconnect from self!? */
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT_DISCONNECT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message for `%4s'.\n",
- "DISCONNECT",
- GNUNET_i2s (&dim->peer));
-#endif
- n = neighbour_find (h, &dim->peer);
- GNUNET_break (n != NULL);
- if (n != NULL)
- neighbour_disconnect (n);
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
- if (size != sizeof (struct SendOkMessage))
- {
- GNUNET_break (0);
- break;
- }
- okm = (const struct SendOkMessage *) msg;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message, transmission %s.\n", "SEND_OK",
- ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
-#endif
- n = neighbour_find (h, &okm->peer);
- GNUNET_assert (n != NULL);
- switch (n->transmit_stage)
- {
- case TS_NEW:
- GNUNET_break (0);
- break;
- case TS_QUEUED:
- GNUNET_break (0);
- break;
- case TS_TRANSMITTED:
- n->transmit_stage = TS_NEW;
- break;
- case TS_TRANSMITTED_QUEUED:
- n->transmit_stage = TS_QUEUED;
- schedule_transmission (h);
- break;
- default:
- GNUNET_break (0);
- }
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message.\n", "RECV");
-#endif
- if (size <
- sizeof (struct InboundMessage) +
- sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- break;
- }
- im = (const struct InboundMessage *) msg;
- GNUNET_break (0 == ntohl (im->reserved));
- ats_count = ntohl(im->ats_count);
- //imm = (const struct GNUNET_MessageHeader *) &im[1];
- imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count+1]);
+ hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
+ hwl->rec = rec;
+ hwl->rec_cls = rec_cls;
+ GNUNET_CONTAINER_DLL_insert (handle->hwl_head,
+ handle->hwl_tail,
+ hwl);
+ if (handle->my_hello == NULL)
+ return;
+ rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
+}
- if (ntohs (imm->size) + sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
- {
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received message of type %u from `%4s'.\n",
- ntohs (imm->type), GNUNET_i2s (&im->peer));
-#endif
- n = neighbour_find (h, &im->peer);
- if (n == NULL)
- {
- GNUNET_break (0);
- break;
- }
- if (n->is_connected != GNUNET_YES)
- {
- GNUNET_break (0);
- break;
- }
- /* FIXME: */
- if (h->rec != NULL)
- h->rec (h->cls, &im->peer, imm,
- &im->ats, ats_count);
- /* ENDFIX */
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("Received unexpected message of type %u in %s:%u\n"),
- ntohs (msg->type), __FILE__, __LINE__);
- GNUNET_break (0);
- break;
+
+/**
+ * Stop receiving updates about changes to our HELLO message.
+ *
+ * @param handle connection to transport service
+ * @param rec function previously registered to be called with the HELLOs
+ * @param rec_cls closure for rec
+ */
+void
+GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
+ GNUNET_TRANSPORT_HelloUpdateCallback rec,
+ void *rec_cls)
+{
+ struct HelloWaitList *pos;
+
+ pos = handle->hwl_head;
+ while (pos != NULL)
+ {
+ if ( (pos->rec == rec) &&
+ (pos->rec_cls == rec_cls) )
+ break;
+ pos = pos->next;
}
+ GNUNET_break (pos != NULL);
+ if (pos == NULL)
+ return;
+ GNUNET_CONTAINER_DLL_remove (handle->hwl_head,
+ handle->hwl_tail,
+ pos);
+ GNUNET_free (pos);
}
/**
- * Called when our transmit request timed out before any transport
- * reported success connecting to the desired peer or before the
- * transport was ready to receive. Signal error and free
- * TransmitHandle.
+ * Connect to the transport service. Note that the connection may
+ * complete (or fail) asynchronously.
*
- * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle*' that is timing out
- * @param tc scheduler context
+ * @param cfg configuration to use
+ * @param self our own identity (API should check that it matches
+ * the identity found by transport), or NULL (no check)
+ * @param cls closure for the callbacks
+ * @param rec receive function to call
+ * @param nc function to call on connect events
+ * @param nd function to call on disconnect events
*/
-static void
-peer_transmit_timeout (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+struct GNUNET_TRANSPORT_Handle *
+GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PeerIdentity *self,
+ void *cls,
+ GNUNET_TRANSPORT_ReceiveCallback rec,
+ GNUNET_TRANSPORT_NotifyConnect nc,
+ GNUNET_TRANSPORT_NotifyDisconnect nd)
{
- struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
- struct NeighbourList *n;
- GNUNET_CONNECTION_TransmitReadyNotify notify;
- void *notify_cls;
+ struct GNUNET_TRANSPORT_Handle *ret;
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
- n = th->neighbour;
+ ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
+ if (self != NULL)
+ {
+ ret->self = *self;
+ ret->check_self = GNUNET_YES;
+ }
+ ret->cfg = cfg;
+ ret->cls = cls;
+ ret->rec = rec;
+ ret->nc_cb = nc;
+ ret->nd_cb = nd;
+ ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
+ ret->neighbours = GNUNET_CONTAINER_multihashmap_create(STARTING_NEIGHBOURS_SIZE);
+ ret->ready_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
+ return ret;
+}
+
+
+/**
+ * Disconnect from the transport service.
+ *
+ * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
+ */
+void
+GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
+{
#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- "Triggering timeout for request to transmit to `%4s' (%d)\n",
- GNUNET_i2s (&n->id),
- n->transmit_stage);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transport disconnect called!\n");
#endif
- notify = th->notify;
- th->notify = NULL;
- notify_cls = th->notify_cls;
- switch (n->transmit_stage)
+ /* this disconnects all neighbours... */
+ if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
+ disconnect_and_schedule_reconnect (handle);
+ /* and now we stop trying to connect again... */
+ if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
{
- case TS_NEW:
- GNUNET_break (0);
- break;
- case TS_QUEUED:
- n->transmit_stage = TS_NEW;
- if (n->is_connected == GNUNET_NO)
- neighbour_free (n);
- break;
- case TS_TRANSMITTED:
- GNUNET_break (0);
- break;
- case TS_TRANSMITTED_QUEUED:
- n->transmit_stage = TS_TRANSMITTED;
- break;
- default:
- GNUNET_break (0);
+ GNUNET_SCHEDULER_cancel (handle->reconnect_task);
+ handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
+ handle->neighbours = NULL;
+ if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (handle->quota_task);
+ handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
}
- if (NULL != notify)
- notify (notify_cls, 0, NULL);
+ GNUNET_free_non_null (handle->my_hello);
+ handle->my_hello = NULL;
+ GNUNET_assert (handle->hwl_head == NULL);
+ GNUNET_assert (handle->hwl_tail == NULL);
+ GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
+ handle->ready_heap = NULL;
+ GNUNET_free (handle);
}
* using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
*/
struct GNUNET_TRANSPORT_TransmitHandle *
-GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle
- *handle,
- const struct GNUNET_PeerIdentity
- *target, size_t size,
+GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
+ const struct GNUNET_PeerIdentity *target,
+ size_t size,
uint32_t priority,
struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify
- notify, void *notify_cls)
+ GNUNET_CONNECTION_TransmitReadyNotify notify,
+ void *notify_cls)
{
+ struct Neighbour *n;
struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct NeighbourList *n;
-
- if (size + sizeof (struct OutboundMessage) >=
- GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Message size is %d, max allowed is %d.\n",
- size + sizeof (struct OutboundMessage), GNUNET_SERVER_MAX_MESSAGE_SIZE - 1);
-#endif
- GNUNET_break (0);
- return NULL;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Asking transport service for transmission of %u bytes to peer `%4s' within %llu ms.\n",
- size, GNUNET_i2s (target),
- (unsigned long long) timeout.rel_value);
-#endif
+ struct GNUNET_TIME_Relative delay;
+
n = neighbour_find (handle, target);
- if (n == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Created neighbour entry for peer `%s'\n",
- GNUNET_i2s (target));
- n = neighbour_add (handle, target);
- }
- if (n == NULL)
+ if (NULL == n)
{
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Could not create neighbour entry for peer `%s'\n",
- GNUNET_i2s (target));
+ /* use GNUNET_TRANSPORT_try_connect first, only use this function
+ once a connection has been established */
+ GNUNET_assert (0);
return NULL;
}
-
- /**
- * Send a request connect message if not connected,
- * otherwise we will never send anything to
- * transport service
- */
- if (n->is_connected == GNUNET_NO)
- {
- send_request_connect_message(handle, n);
- }
-
- switch (n->transmit_stage)
+ if (NULL != n->th)
{
- case TS_NEW:
- n->transmit_stage = TS_QUEUED;
- break;
- case TS_QUEUED:
- GNUNET_break (0);
- return NULL;
- case TS_TRANSMITTED:
- n->transmit_stage = TS_TRANSMITTED_QUEUED;
- break;
- case TS_TRANSMITTED_QUEUED:
- GNUNET_break (0);
- return NULL;
- default:
- GNUNET_break (0);
+ /* attempt to send two messages at the same time to the same peer */
+ GNUNET_assert (0);
return NULL;
}
- th = &n->transmit_handle;
+ GNUNET_assert (NULL == n->hn);
+ th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
th->neighbour = n;
th->notify = notify;
th->notify_cls = notify_cls;
th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- th->notify_size = size + sizeof (struct OutboundMessage);
+ th->notify_size = size;
th->priority = priority;
- th->notify_delay_task
- = GNUNET_SCHEDULER_add_delayed (timeout,
- &peer_transmit_timeout, th);
+ n->th = th;
+ /* calculate when our transmission should be ready */
+ delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
+ if (delay.rel_value > timeout.rel_value)
+ delay.rel_value = 0; /* notify immediately (with failure) */
+#if DEBUG_TRANSPORT
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
+ GNUNET_i2s (target),
+ (unsigned long long) delay.rel_value);
+#endif
+ n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap,
+ n,
+ delay.rel_value);
schedule_transmission (handle);
return th;
}
/**
* Cancel the specified transmission-ready notification.
+ *
+ * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
*/
void
-GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
- GNUNET_TRANSPORT_TransmitHandle
- *th)
+GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th)
{
- struct NeighbourList *n;
+ struct Neighbour *n;
- th->notify = NULL;
+ GNUNET_assert (NULL == th->next);
+ GNUNET_assert (NULL == th->prev);
n = th->neighbour;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmission request of %u bytes to `%4s' was canceled.\n",
- th->notify_size - sizeof (struct OutboundMessage),
- GNUNET_i2s (&n->id));
-#endif
- if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_assert (th == n->th);
+ n->th = NULL;
+ if (n->hn != NULL)
{
- GNUNET_SCHEDULER_cancel (th->notify_delay_task);
- th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_CONTAINER_heap_remove_node (n->hn);
+ n->hn = NULL;
}
- switch (n->transmit_stage)
+ else
{
- case TS_NEW:
- GNUNET_assert (0);
- break;
- case TS_QUEUED:
- n->transmit_stage = TS_NEW;
- if ( (n->in_disconnect == GNUNET_NO) &&
- (n->is_connected == GNUNET_NO) )
- neighbour_free (n);
- break;
- case TS_TRANSMITTED:
- GNUNET_break (0);
- break;
- case TS_TRANSMITTED_QUEUED:
- n->transmit_stage = TS_TRANSMITTED;
- break;
- default:
- GNUNET_break (0);
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
+ GNUNET_SCHEDULER_cancel (th->timeout_task);
+ th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
}
+ GNUNET_free (th);
}
+++ /dev/null
-/*
- This file is part of GNUnet.
- (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
-
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
-
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
-*/
-
-/**
- * @file transport/transport_api.c
- * @brief library to access the low-level P2P IO service
- * @author Christian Grothoff
- *
- * TODO:
- * - adjust testcases to use new 'try connect' style (should be easy, breaks API compatibility!)
- * - adjust core service to use new 'try connect' style (should be MUCH nicer there as well!)
- * - test test test
- */
-#include "platform.h"
-#include "gnunet_bandwidth_lib.h"
-#include "gnunet_client_lib.h"
-#include "gnunet_constants.h"
-#include "gnunet_container_lib.h"
-#include "gnunet_arm_service.h"
-#include "gnunet_hello_lib.h"
-#include "gnunet_protocols.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_time_lib.h"
-#include "gnunet_transport_service.h"
-#include "transport.h"
-
-/**
- * How large to start with for the hashmap of neighbours.
- */
-#define STARTING_NEIGHBOURS_SIZE 16
-
-
-/**
- * Handle for a message that should be transmitted to the service.
- * Used for both control messages and normal messages.
- */
-struct GNUNET_TRANSPORT_TransmitHandle
-{
-
- /**
- * We keep all requests in a DLL.
- */
- struct GNUNET_TRANSPORT_TransmitHandle *next;
-
- /**
- * We keep all requests in a DLL.
- */
- struct GNUNET_TRANSPORT_TransmitHandle *prev;
-
- /**
- * Neighbour for this handle, NULL for control messages.
- */
- struct Neighbour *neighbour;
-
- /**
- * Function to call when notify_size bytes are available
- * for transmission.
- */
- GNUNET_CONNECTION_TransmitReadyNotify notify;
-
- /**
- * Closure for notify.
- */
- void *notify_cls;
-
- /**
- * Timeout for this request, 0 for control messages.
- */
- struct GNUNET_TIME_Absolute timeout;
-
- /**
- * Task to trigger request timeout if the request is stalled due to
- * congestion.
- */
- GNUNET_SCHEDULER_TaskIdentifier timeout_task;
-
- /**
- * How many bytes is our notify callback waiting for?
- */
- size_t notify_size;
-
- /**
- * How important is this message? Not used for control messages.
- */
- uint32_t priority;
-
-};
-
-
-/**
- * Entry in hash table of all of our current neighbours.
- */
-struct Neighbour
-{
- /**
- * Overall transport handle.
- */
- struct GNUNET_TRANSPORT_Handle *h;
-
- /**
- * Active transmit handle or NULL.
- */
- struct GNUNET_TRANSPORT_TransmitHandle *th;
-
- /**
- * Identity of this neighbour.
- */
- struct GNUNET_PeerIdentity id;
-
- /**
- * Outbound bandwidh tracker.
- */
- struct GNUNET_BANDWIDTH_Tracker out_tracker;
-
- /**
- * Entry in our readyness heap (which is sorted by 'next_ready'
- * value). NULL if there is no pending transmission request for
- * this neighbour or if we're waiting for 'is_ready' to become
- * true AFTER the 'out_tracker' suggested that this peer's quota
- * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
- * we should immediately go back into the heap).
- */
- struct GNUNET_CONTAINER_HeapNode *hn;
-
- /**
- * Is this peer currently ready to receive a message?
- */
- int is_ready;
-
-};
-
-
-/**
- * Linked list of functions to call whenever our HELLO is updated.
- */
-struct HelloWaitList
-{
-
- /**
- * This is a doubly linked list.
- */
- struct HelloWaitList *next;
-
- /**
- * This is a doubly linked list.
- */
- struct HelloWaitList *prev;
-
- /**
- * Callback to call once we got our HELLO.
- */
- GNUNET_TRANSPORT_HelloUpdateCallback rec;
-
- /**
- * Closure for rec.
- */
- void *rec_cls;
-
-};
-
-
-/**
- * Handle for the transport service (includes all of the
- * state for the transport service).
- */
-struct GNUNET_TRANSPORT_Handle
-{
-
- /**
- * Closure for the callbacks.
- */
- void *cls;
-
- /**
- * Function to call for received data.
- */
- GNUNET_TRANSPORT_ReceiveCallback rec;
-
- /**
- * function to call on connect events
- */
- GNUNET_TRANSPORT_NotifyConnect nc_cb;
-
- /**
- * function to call on disconnect events
- */
- GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
-
- /**
- * Head of DLL of control messages.
- */
- struct GNUNET_TRANSPORT_TransmitHandle *control_head;
-
- /**
- * Tail of DLL of control messages.
- */
- struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
-
- /**
- * The current HELLO message for this peer. Updated
- * whenever transports change their addresses.
- */
- struct GNUNET_HELLO_Message *my_hello;
-
- /**
- * My client connection to the transport service.
- */
- struct GNUNET_CLIENT_Connection *client;
-
- /**
- * Handle to our registration with the client for notification.
- */
- struct GNUNET_CLIENT_TransmitHandle *cth;
-
- /**
- * Linked list of pending requests for our HELLO.
- */
- struct HelloWaitList *hwl_head;
-
- /**
- * Linked list of pending requests for our HELLO.
- */
- struct HelloWaitList *hwl_tail;
-
- /**
- * My configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
-
- /**
- * Hash map of the current connected neighbours of this peer.
- * Maps peer identities to 'struct Neighbour' entries.
- */
- struct GNUNET_CONTAINER_MultiHashMap *neighbours;
-
- /**
- * Heap sorting peers with pending messages by the timestamps that
- * specify when we could next send a message to the respective peer.
- * Excludes control messages (which can always go out immediately).
- * Maps time stamps to 'struct Neighbour' entries.
- */
- struct GNUNET_CONTAINER_Heap *ready_heap;
-
- /**
- * Peer identity as assumed by this process, or all zeros.
- */
- struct GNUNET_PeerIdentity self;
-
- /**
- * ID of the task trying to reconnect to the service.
- */
- GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
-
- /**
- * ID of the task trying to trigger transmission for a peer while
- * maintaining bandwidth quotas. In use if there are no control
- * messages and the smallest entry in the 'ready_heap' has a time
- * stamp in the future.
- */
- GNUNET_SCHEDULER_TaskIdentifier quota_task;
-
- /**
- * Delay until we try to reconnect.
- */
- struct GNUNET_TIME_Relative reconnect_delay;
-
- /**
- * Should we check that 'self' matches what the service thinks?
- * (if GNUNET_NO, then 'self' is all zeros!).
- */
- int check_self;
-};
-
-
-/**
- * Schedule the task to send one message, either from the control
- * list or the peer message queues to the service.
- *
- * @param h transport service to schedule a transmission for
- */
-static void
-schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
-
-
-/**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param h transport service to reconnect
- */
-static void
-disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
-
-
-/**
- * Get the neighbour list entry for the given peer
- *
- * @param h our context
- * @param peer peer to look up
- * @return NULL if no such peer entry exists
- */
-static struct Neighbour *
-neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
- const struct GNUNET_PeerIdentity *peer)
-{
- return GNUNET_CONTAINER_multihashmap_get(h->neighbours, &peer->hashPubKey);
-}
-
-
-/**
- * Add neighbour to our list
- *
- * @return NULL if this API is currently disconnecting from the service
- */
-static struct Neighbour *
-neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
- const struct GNUNET_PeerIdentity *pid)
-{
- struct Neighbour *n;
-
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Creating entry for neighbour `%4s'.\n",
- GNUNET_i2s (pid));
-#endif
- n = GNUNET_malloc (sizeof (struct Neighbour));
- n->id = *pid;
- n->h = h;
- n->is_ready = GNUNET_YES;
- GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
- GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
- MAX_BANDWIDTH_CARRY_S);
- GNUNET_assert (GNUNET_OK ==
- GNUNET_CONTAINER_multihashmap_put (h->neighbours,
- &pid->hashPubKey,
- n,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- return n;
-}
-
-
-/**
- * Iterator over hash map entries, for deleting state of a neighbour.
- *
- * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
- * @param key peer identity
- * @param value value in the hash map, the neighbour entry to delete
- * @return GNUNET_YES if we should continue to
- * iterate,
- * GNUNET_NO if not.
- */
-static int
-neighbour_delete (void *cls,
- const GNUNET_HashCode * key,
- void *value)
-{
- struct GNUNET_TRANSPORT_Handle *handle = cls;
- struct Neighbour *n = value;
-
- if (NULL != handle->nd_cb)
- handle->nd_cb (handle->cls,
- &n->id);
- GNUNET_assert (NULL == n->th);
- GNUNET_assert (NULL == n->hn);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (handle->neighbours,
- key,
- n));
- GNUNET_free (n);
- return GNUNET_YES;
-}
-
-
-/**
- * Function we use for handling incoming messages.
- *
- * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
- * @param msg message received, NULL on timeout or fatal error
- */
-static void
-demultiplexer (void *cls,
- const struct GNUNET_MessageHeader *msg)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- const struct DisconnectInfoMessage *dim;
- const struct ConnectInfoMessage *cim;
- const struct InboundMessage *im;
- const struct GNUNET_MessageHeader *imm;
- const struct SendOkMessage *okm;
- struct HelloWaitList *hwl;
- struct HelloWaitList *next_hwl;
- struct Neighbour *n;
- struct GNUNET_PeerIdentity me;
- uint16_t size;
- uint32_t ats_count;
-
- GNUNET_assert (h->client != NULL);
- if (msg == NULL)
- {
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "Error receiving from transport service, disconnecting temporarily.\n");
-#endif
- disconnect_and_schedule_reconnect (h);
- return;
- }
- GNUNET_CLIENT_receive (h->client,
- &demultiplexer, h,
- GNUNET_TIME_UNIT_FOREVER_REL);
- size = ntohs (msg->size);
- switch (ntohs (msg->type))
- {
- case GNUNET_MESSAGE_TYPE_HELLO:
- if (GNUNET_OK !=
- GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
- &me))
- {
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving (my own) `%s' message, I am `%4s'.\n",
- "HELLO", GNUNET_i2s (&me));
-#endif
- GNUNET_free_non_null (h->my_hello);
- h->my_hello = NULL;
- if (size < sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- break;
- }
- h->my_hello = GNUNET_malloc (size);
- memcpy (h->my_hello, msg, size);
- hwl = h->hwl_head;
- while (NULL != hwl)
- {
- next_hwl = hwl->next;
- hwl->rec (hwl->rec_cls,
- (const struct GNUNET_MessageHeader *) h->my_hello);
- hwl = next_hwl;
- }
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
- if (size < sizeof (struct ConnectInfoMessage))
- {
- GNUNET_break (0);
- break;
- }
- cim = (const struct ConnectInfoMessage *) msg;
- ats_count = ntohl (cim->ats_count);
- if (size != sizeof (struct ConnectInfoMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information))
- {
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message for `%4s'.\n",
- "CONNECT", GNUNET_i2s (&cim->id));
-#endif
- n = neighbour_find (h, &cim->id);
- if (n != NULL)
- {
- GNUNET_break (0);
- break;
- }
- n = neighbour_add (h, &cim->id);
- if (h->nc_cb != NULL)
- h->nc_cb (h->cls, &n->id,
- &cim->ats, ats_count);
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
- if (size != sizeof (struct DisconnectInfoMessage))
- {
- GNUNET_break (0);
- break;
- }
- dim = (const struct DisconnectInfoMessage *) msg;
- GNUNET_break (ntohl (dim->reserved) == 0);
-#if DEBUG_TRANSPORT_DISCONNECT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message for `%4s'.\n",
- "DISCONNECT",
- GNUNET_i2s (&dim->peer));
-#endif
- n = neighbour_find (h, &dim->peer);
- if (n == NULL)
- {
- GNUNET_break (0);
- break;
- }
- neighbour_delete (h, &dim->peer.hashPubKey, n);
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
- if (size != sizeof (struct SendOkMessage))
- {
- GNUNET_break (0);
- break;
- }
- okm = (const struct SendOkMessage *) msg;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message, transmission %s.\n", "SEND_OK",
- ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
-#endif
- n = neighbour_find (h, &okm->peer);
- if (n == NULL)
- break;
- GNUNET_break (GNUNET_NO == n->is_ready);
- n->is_ready = GNUNET_YES;
- if ( (n->th != NULL) &&
- (n->hn == NULL) )
- {
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
- GNUNET_SCHEDULER_cancel (n->th->timeout_task);
- n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- /* we've been waiting for this (congestion, not quota,
- caused delayed transmission) */
- n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap,
- n, 0);
- schedule_transmission (h);
- }
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Receiving `%s' message.\n", "RECV");
-#endif
- if (size <
- sizeof (struct InboundMessage) +
- sizeof (struct GNUNET_MessageHeader))
- {
- GNUNET_break (0);
- break;
- }
- im = (const struct InboundMessage *) msg;
- GNUNET_break (0 == ntohl (im->reserved));
- ats_count = ntohl(im->ats_count);
- imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count+1]);
-
- if (ntohs (imm->size) + sizeof (struct InboundMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
- {
- GNUNET_break (0);
- break;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received message of type %u from `%4s'.\n",
- ntohs (imm->type), GNUNET_i2s (&im->peer));
-#endif
- n = neighbour_find (h, &im->peer);
- if (n == NULL)
- {
- GNUNET_break (0);
- break;
- }
- if (h->rec != NULL)
- h->rec (h->cls, &im->peer, imm,
- &im->ats, ats_count);
- break;
- default:
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _
- ("Received unexpected message of type %u in %s:%u\n"),
- ntohs (msg->type), __FILE__, __LINE__);
- GNUNET_break (0);
- break;
- }
-}
-
-
-/**
- * A transmission request could not be satisfied because of
- * network congestion. Notify the initiator and clean up.
- *
- * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
- * @param tc scheduler context
- */
-static void
-timeout_request_due_to_congestion (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
- struct Neighbour *n = th->neighbour;
-
- n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_assert (th == n->th);
- GNUNET_assert (NULL == n->hn);
- n->th = NULL;
- th->notify (th->notify_cls, 0, NULL);
- GNUNET_free (th);
-}
-
-
-/**
- * Transmit message(s) to service.
- *
- * @param cls handle to transport
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-transport_notify_ready (void *cls, size_t size, void *buf)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct Neighbour *n;
- char *cbuf;
- struct OutboundMessage obm;
- size_t ret;
- size_t nret;
- size_t mret;
-
- GNUNET_assert (NULL != h->client);
- h->cth = NULL;
- if (NULL == buf)
- {
- /* transmission failed */
- disconnect_and_schedule_reconnect (h);
- return 0;
- }
-
- cbuf = buf;
- ret = 0;
- /* first send control messages */
- while ( (NULL != (th = h->control_head)) &&
- (th->notify_size <= size) )
- {
- GNUNET_CONTAINER_DLL_remove (h->control_head,
- h->control_tail,
- th);
- nret = th->notify (th->notify_cls, size, &cbuf[ret]);
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Added %u bytes of control message at %u\n",
- nret,
- ret);
-#endif
- GNUNET_free (th);
- ret += nret;
- size -= nret;
- }
-
- /* then, if possible and no control messages pending, send data messages */
- while ( (NULL == h->control_head) &&
- (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) )
- {
- if (GNUNET_YES != n->is_ready)
- {
- /* peer not ready, wait for notification! */
- GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
- n->hn = NULL;
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
- n->th->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (n->th->timeout),
- &timeout_request_due_to_congestion,
- n->th);
- continue;
- }
- th = n->th;
- if (th->notify_size + sizeof (struct OutboundMessage) > size)
- break; /* does not fit */
- if (GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, th->notify_size).rel_value > 0)
- break; /* too early */
- GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
- n->hn = NULL;
- n->th = NULL;
- n->is_ready = GNUNET_NO;
- GNUNET_assert (size >= sizeof (struct OutboundMessage));
- mret = th->notify (th->notify_cls,
- size - sizeof (struct OutboundMessage),
- &cbuf[ret + sizeof (struct OutboundMessage)]);
- GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
- if (mret != 0)
- {
- GNUNET_assert (mret + sizeof (struct OutboundMessage) < GNUNET_SERVER_MAX_MESSAGE_SIZE);
- obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
- obm.header.size = htons (mret + sizeof (struct OutboundMessage));
- obm.priority = htonl (th->priority);
- obm.timeout = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (th->timeout));
- obm.peer = n->id;
- memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
- ret += (mret + sizeof (struct OutboundMessage));
- size -= (mret + sizeof (struct OutboundMessage));
- GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
- }
- GNUNET_free (th);
- }
- /* if there are more pending messages, try to schedule those */
- schedule_transmission (h);
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting %u bytes to transport service\n", ret);
-#endif
- return ret;
-}
-
-
-/**
- * Schedule the task to send one message, either from the control
- * list or the peer message queues to the service.
- *
- * @param cls transport service to schedule a transmission for
- * @param tc scheduler context
- */
-static void
-schedule_transmission_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- size_t size;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct Neighbour *n;
-
- h->quota_task = GNUNET_SCHEDULER_NO_TASK;
- GNUNET_assert (NULL != h->client);
- /* destroy all requests that have timed out */
- while ( (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
- (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0) )
- {
- /* notify client that the request could not be satisfied within
- the given time constraints */
- th = n->th;
- n->th = NULL;
- GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
- n->hn = NULL;
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Signalling timeout for transmission to peer %s due to congestion\n",
- GNUNET_i2s (&n->id));
-#endif
- GNUNET_assert (0 ==
- th->notify (th->notify_cls, 0, NULL));
- GNUNET_free (th);
- }
- if (NULL != h->cth)
- return;
- if (NULL != h->control_head)
- {
- size = h->control_head->notify_size;
- }
- else
- {
- n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
- if (NULL == n)
- return; /* no pending messages */
- size = n->th->notify_size + sizeof (struct OutboundMessage);
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Calling notify_transmit_ready\n");
-#endif
- h->cth =
- GNUNET_CLIENT_notify_transmit_ready (h->client,
- size,
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_NO,
- &transport_notify_ready,
- h);
- GNUNET_assert (NULL != h->cth);
-}
-
-
-/**
- * Schedule the task to send one message, either from the control
- * list or the peer message queues to the service.
- *
- * @param h transport service to schedule a transmission for
- */
-static void
-schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
-{
- struct GNUNET_TIME_Relative delay;
- struct Neighbour *n;
-
- GNUNET_assert (NULL != h->client);
- if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (h->quota_task);
- h->quota_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (NULL != h->control_head)
- delay = GNUNET_TIME_UNIT_ZERO;
- else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
- delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, n->th->notify_size);
- else
- return; /* no work to be done */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling next transmission to service in %llu ms\n",
- (unsigned long long) delay.rel_value);
- h->quota_task = GNUNET_SCHEDULER_add_delayed (delay,
- &schedule_transmission_task,
- h);
-}
-
-
-/**
- * Queue control request for transmission to the transport
- * service.
- *
- * @param h handle to the transport service
- * @param size number of bytes to be transmitted
- * @param notify function to call to get the content
- * @param notify_cls closure for notify
- */
-static void
-schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
- size_t size,
- GNUNET_CONNECTION_TransmitReadyNotify notify,
- void *notify_cls)
-{
- struct GNUNET_TRANSPORT_TransmitHandle *th;
-
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Control transmit of %u bytes requested\n",
- size);
-#endif
- th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
- th->notify = notify;
- th->notify_cls = notify_cls;
- th->notify_size = size;
- GNUNET_CONTAINER_DLL_insert_tail (h->control_head,
- h->control_tail,
- th);
- schedule_transmission (h);
-}
-
-
-/**
- * Transmit START message to service.
- *
- * @param cls unused
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_start (void *cls, size_t size, void *buf)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
- struct StartMessage s;
-
- if (buf == NULL)
- {
- /* Can only be shutdown, just give up */
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Shutdown while trying to transmit `%s' request.\n",
- "START");
-#endif
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request.\n", "START");
-#endif
- GNUNET_assert (size >= sizeof (struct StartMessage));
- s.header.size = htons (sizeof (struct StartMessage));
- s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
- s.do_check = htonl (h->check_self);
- s.self = h->self;
- memcpy (buf, &s, sizeof (struct StartMessage));
- GNUNET_CLIENT_receive (h->client,
- &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
- return sizeof (struct StartMessage);
-}
-
-
-/**
- * Try again to connect to transport service.
- *
- * @param cls the handle to the transport service
- * @param tc scheduler context
- */
-static void
-reconnect (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct GNUNET_TRANSPORT_Handle *h = cls;
-
- h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- {
- /* shutdown, just give up */
- return;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connecting to transport service.\n");
-#endif
- GNUNET_assert (h->client == NULL);
- GNUNET_assert (h->control_head == NULL);
- GNUNET_assert (h->control_tail == NULL);
- h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
- GNUNET_assert (h->client != NULL);
- schedule_control_transmit (h,
- sizeof (struct StartMessage),
- &send_start, h);
-}
-
-
-/**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param h transport service to reconnect
- */
-static void
-disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
-{
- struct GNUNET_TRANSPORT_TransmitHandle *th;
-
- GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
- /* Forget about all neighbours that we used to be connected to */
- GNUNET_CONTAINER_multihashmap_iterate(h->neighbours,
- &neighbour_delete,
- h);
- if (NULL != h->cth)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
- h->cth = NULL;
- }
- if (NULL != h->client)
- {
- GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
- h->client = NULL;
- }
- if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (h->quota_task);
- h->quota_task = GNUNET_SCHEDULER_NO_TASK;
- }
- while ( (NULL != (th = h->control_head)))
- {
- GNUNET_CONTAINER_DLL_remove (h->control_head,
- h->control_tail,
- th);
- th->notify (th->notify_cls, 0, NULL);
- GNUNET_free (th);
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling task to reconnect to transport service in %llu ms.\n",
- h->reconnect_delay.rel_value);
-#endif
- h->reconnect_task
- = GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
- &reconnect, h);
- if (h->reconnect_delay.rel_value == 0)
- {
- h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
- }
- else
- {
- h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
- h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
- h->reconnect_delay);
- }
-}
-
-
-/**
- * Closure for 'send_set_quota'.
- */
-struct SetQuotaContext
-{
-
- /**
- * Identity of the peer impacted by the quota change.
- */
- struct GNUNET_PeerIdentity target;
-
- /**
- * Quota to transmit.
- */
- struct GNUNET_BANDWIDTH_Value32NBO quota_in;
-};
-
-
-/**
- * Send SET_QUOTA message to the service.
- *
- * @param cls the 'struct SetQuotaContext'
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_set_quota (void *cls, size_t size, void *buf)
-{
- struct SetQuotaContext *sqc = cls;
- struct QuotaSetMessage msg;
-
- if (buf == NULL)
- {
- GNUNET_free (sqc);
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request with respect to `%4s'.\n",
- "SET_QUOTA",
- GNUNET_i2s (&sqc->target));
-#endif
- GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
- msg.header.size = htons (sizeof (struct QuotaSetMessage));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
- msg.quota = sqc->quota_in;
- msg.peer = sqc->target;
- memcpy (buf, &msg, sizeof (msg));
- GNUNET_free (sqc);
- return sizeof (struct QuotaSetMessage);
-}
-
-
-/**
- * Set the share of incoming bandwidth for the given
- * peer to the specified amount.
- *
- * @param handle connection to transport service
- * @param target who's bandwidth quota is being changed
- * @param quota_in incoming bandwidth quota in bytes per ms
- * @param quota_out outgoing bandwidth quota in bytes per ms
- */
-void
-GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target,
- struct GNUNET_BANDWIDTH_Value32NBO quota_in,
- struct GNUNET_BANDWIDTH_Value32NBO quota_out)
-{
- struct Neighbour *n;
- struct SetQuotaContext *sqc;
-
- n = neighbour_find (handle, target);
- if (NULL == n)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
- (unsigned int) ntohl (quota_out.value__),
- GNUNET_i2s (target));
- return;
- }
- GNUNET_assert (NULL != handle->client);
-#if DEBUG_TRANSPORT
- if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Quota changed from %u to %u for peer `%s'\n",
- (unsigned int) n->out_tracker.available_bytes_per_s__,
- (unsigned int) ntohl (quota_out.value__),
- GNUNET_i2s (target));
- else
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Quota remains at %u for peer `%s'\n",
- (unsigned int) n->out_tracker.available_bytes_per_s__,
- GNUNET_i2s (target));
-#endif
- GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
- quota_out);
- sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
- sqc->target = *target;
- sqc->quota_in = quota_in;
- schedule_control_transmit (handle,
- sizeof (struct QuotaSetMessage),
- &send_set_quota, sqc);
-}
-
-
-/**
- * Send REQUEST_CONNECT message to the service.
- *
- * @param cls the 'struct GNUNET_PeerIdentity'
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_try_connect (void *cls, size_t size, void *buf)
-{
- struct GNUNET_PeerIdentity *pid = cls;
- struct TransportRequestConnectMessage msg;
-
- if (buf == NULL)
- {
- GNUNET_free (pid);
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request with respect to `%4s'.\n",
- "REQUEST_CONNECT",
- GNUNET_i2s (pid));
-#endif
- GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
- msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
- msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
- msg.reserved = htonl (0);
- msg.peer = *pid;
- memcpy (buf, &msg, sizeof (msg));
- GNUNET_free (pid);
- return sizeof (struct TransportRequestConnectMessage);
-}
-
-
-/**
- * Ask the transport service to establish a connection to
- * the given peer.
- *
- * @param handle connection to transport service
- * @param target who we should try to connect to
- */
-void
-GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target)
-{
- struct GNUNET_PeerIdentity *pid;
-
- if (NULL == handle->client)
- return;
- pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
- *pid = *target;
- schedule_control_transmit (handle,
- sizeof (struct TransportRequestConnectMessage),
- &send_try_connect, pid);
-}
-
-
-/**
- * Send HELLO message to the service.
- *
- * @param cls the HELLO message to send
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to buf
- */
-static size_t
-send_hello (void *cls, size_t size, void *buf)
-{
- struct GNUNET_MessageHeader *msg = cls;
- uint16_t ssize;
-
- if (buf == NULL)
- {
-#if DEBUG_TRANSPORT_TIMEOUT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Timeout while trying to transmit `%s' request.\n",
- "HELLO");
-#endif
- GNUNET_free (msg);
- return 0;
- }
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request.\n", "HELLO");
-#endif
- ssize = ntohs (msg->size);
- GNUNET_assert (size >= ssize);
- memcpy (buf, msg, ssize);
- GNUNET_free (msg);
- return ssize;
-}
-
-
-/**
- * Offer the transport service the HELLO of another peer. Note that
- * the transport service may just ignore this message if the HELLO is
- * malformed or useless due to our local configuration.
- *
- * @param handle connection to transport service
- * @param hello the hello message
- * @param cont continuation to call when HELLO has been sent
- * @param cls closure for continuation
- *
- */
-void
-GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_MessageHeader *hello,
- GNUNET_SCHEDULER_Task cont,
- void *cls)
-{
- uint16_t size;
- struct GNUNET_PeerIdentity peer;
- struct GNUNET_MessageHeader *msg;
-
- if (NULL == handle->client)
- return;
- GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
- size = ntohs (hello->size);
- GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
- if (GNUNET_OK != GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message*) hello,
- &peer))
- {
- GNUNET_break (0);
- return;
- }
- msg = GNUNET_malloc(size);
- memcpy (msg, hello, size);
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Offering `%s' message of `%4s' to transport for validation.\n",
- "HELLO",
- GNUNET_i2s (&peer));
-#endif
- schedule_control_transmit (handle,
- size,
- &send_hello, msg);
-}
-
-
-/**
- * Obtain the HELLO message for this peer.
- *
- * @param handle connection to transport service
- * @param rec function to call with the HELLO, sender will be our peer
- * identity; message and sender will be NULL on timeout
- * (handshake with transport service pending/failed).
- * cost estimate will be 0.
- * @param rec_cls closure for rec
- */
-void
-GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls)
-{
- struct HelloWaitList *hwl;
-
- hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
- hwl->rec = rec;
- hwl->rec_cls = rec_cls;
- GNUNET_CONTAINER_DLL_insert (handle->hwl_head,
- handle->hwl_tail,
- hwl);
- if (handle->my_hello == NULL)
- return;
- rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
-}
-
-
-/**
- * Stop receiving updates about changes to our HELLO message.
- *
- * @param handle connection to transport service
- * @param rec function previously registered to be called with the HELLOs
- * @param rec_cls closure for rec
- */
-void
-GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
- GNUNET_TRANSPORT_HelloUpdateCallback rec,
- void *rec_cls)
-{
- struct HelloWaitList *pos;
-
- pos = handle->hwl_head;
- while (pos != NULL)
- {
- if ( (pos->rec == rec) &&
- (pos->rec_cls == rec_cls) )
- break;
- pos = pos->next;
- }
- GNUNET_break (pos != NULL);
- if (pos == NULL)
- return;
- GNUNET_CONTAINER_DLL_remove (handle->hwl_head,
- handle->hwl_tail,
- pos);
- GNUNET_free (pos);
-}
-
-
-/**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
- *
- * @param cfg configuration to use
- * @param self our own identity (API should check that it matches
- * the identity found by transport), or NULL (no check)
- * @param cls closure for the callbacks
- * @param rec receive function to call
- * @param nc function to call on connect events
- * @param nd function to call on disconnect events
- */
-struct GNUNET_TRANSPORT_Handle *
-GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_PeerIdentity *self,
- void *cls,
- GNUNET_TRANSPORT_ReceiveCallback rec,
- GNUNET_TRANSPORT_NotifyConnect nc,
- GNUNET_TRANSPORT_NotifyDisconnect nd)
-{
- struct GNUNET_TRANSPORT_Handle *ret;
-
- ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
- if (self != NULL)
- {
- ret->self = *self;
- ret->check_self = GNUNET_YES;
- }
- ret->cfg = cfg;
- ret->cls = cls;
- ret->rec = rec;
- ret->nc_cb = nc;
- ret->nd_cb = nd;
- ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
- ret->neighbours = GNUNET_CONTAINER_multihashmap_create(STARTING_NEIGHBOURS_SIZE);
- ret->ready_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
- return ret;
-}
-
-
-/**
- * Disconnect from the transport service.
- *
- * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
- */
-void
-GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
-{
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transport disconnect called!\n");
-#endif
- /* this disconnects all neighbours... */
- if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
- disconnect_and_schedule_reconnect (handle);
- /* and now we stop trying to connect again... */
- if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (handle->reconnect_task);
- handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
- handle->neighbours = NULL;
- if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (handle->quota_task);
- handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free_non_null (handle->my_hello);
- handle->my_hello = NULL;
- GNUNET_assert (handle->hwl_head == NULL);
- GNUNET_assert (handle->hwl_tail == NULL);
- GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
- handle->ready_heap = NULL;
- GNUNET_free (handle);
-}
-
-
-/**
- * Check if we could queue a message of the given size for
- * transmission. The transport service will take both its
- * internal buffers and bandwidth limits imposed by the
- * other peer into consideration when answering this query.
- *
- * @param handle connection to transport service
- * @param target who should receive the message
- * @param size how big is the message we want to transmit?
- * @param priority how important is the message?
- * @param timeout after how long should we give up (and call
- * notify with buf NULL and size 0)?
- * @param notify function to call when we are ready to
- * send such a message
- * @param notify_cls closure for notify
- * @return NULL if someone else is already waiting to be notified
- * non-NULL if the notify callback was queued (can be used to cancel
- * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
- */
-struct GNUNET_TRANSPORT_TransmitHandle *
-GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
- const struct GNUNET_PeerIdentity *target,
- size_t size,
- uint32_t priority,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_CONNECTION_TransmitReadyNotify notify,
- void *notify_cls)
-{
- struct Neighbour *n;
- struct GNUNET_TRANSPORT_TransmitHandle *th;
- struct GNUNET_TIME_Relative delay;
-
- n = neighbour_find (handle, target);
- if (NULL == n)
- {
- /* use GNUNET_TRANSPORT_try_connect first, only use this function
- once a connection has been established */
- GNUNET_assert (0);
- return NULL;
- }
- if (NULL != n->th)
- {
- /* attempt to send two messages at the same time to the same peer */
- GNUNET_assert (0);
- return NULL;
- }
- GNUNET_assert (NULL == n->hn);
- th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
- th->neighbour = n;
- th->notify = notify;
- th->notify_cls = notify_cls;
- th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
- th->notify_size = size;
- th->priority = priority;
- n->th = th;
- /* calculate when our transmission should be ready */
- delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
- if (delay.rel_value > timeout.rel_value)
- delay.rel_value = 0; /* notify immediately (with failure) */
-#if DEBUG_TRANSPORT
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
- GNUNET_i2s (target),
- (unsigned long long) delay.rel_value);
-#endif
- n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap,
- n,
- delay.rel_value);
- schedule_transmission (handle);
- return th;
-}
-
-
-/**
- * Cancel the specified transmission-ready notification.
- *
- * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
- */
-void
-GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th)
-{
- struct Neighbour *n;
-
- GNUNET_assert (NULL == th->next);
- GNUNET_assert (NULL == th->prev);
- n = th->neighbour;
- GNUNET_assert (th == n->th);
- n->th = NULL;
- if (n->hn != NULL)
- {
- GNUNET_CONTAINER_heap_remove_node (n->hn);
- n->hn = NULL;
- }
- else
- {
- GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
- GNUNET_SCHEDULER_cancel (th->timeout_task);
- th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_free (th);
-}
-
-
-/* end of transport_api.c */
projects / oweals / gnunet.git / commitdiff