GNUnet  0.11.x
Data Structures | Typedefs | Functions
gnunet-service-cadet_connection.h File Reference

A connection is a live end-to-end messaging mechanism where the peers are identified by a path and know how to forward along the route using a connection identifier for routing the data. More...

#include "gnunet_util_lib.h"
#include "gnunet-service-cadet.h"
#include "gnunet-service-cadet_peer.h"
#include "cadet_protocol.h"
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Data Structures

struct  CadetConnectionCreatePS
 Purpose for the signature of a monotime. More...
 
struct  CadetConnectionMetrics
 Performance metrics for a connection. More...
 

Typedefs

typedef void(* GCC_ReadyCallback) (void *cls, int is_ready)
 Function called to notify tunnel about change in our readiness. More...
 

Functions

void GCC_destroy_without_core (struct CadetConnection *cc)
 Destroy a connection, called when the CORE layer is already done (i.e. More...
 
void GCC_destroy_without_tunnel (struct CadetConnection *cc)
 Destroy a connection, called if the tunnel association with the connection was already broken, but we still need to notify the CORE layer about the breakage. More...
 
struct CadetConnectionGCC_lookup (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
 Lookup a connection by its identifier. More...
 
struct CadetConnectionGCC_create (struct CadetPeer *destination, struct CadetPeerPath *path, unsigned int off, struct CadetTConnection *ct, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
 Create a connection to destination via path and notify cb whenever we are ready for more data. More...
 
struct CadetConnectionGCC_create_inbound (struct CadetPeer *destination, struct CadetPeerPath *path, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
 Create a connection to destination via path and notify cb whenever we are ready for more data. More...
 
void GCC_transmit (struct CadetConnection *cc, struct GNUNET_MQ_Envelope *env)
 Transmit message msg via connection cc. More...
 
void GCC_handle_connection_create_ack (struct CadetConnection *cc)
 A CREATE_ACK was received for this connection, process it. More...
 
void GCC_handle_duplicate_create (struct CadetConnection *cc)
 We got a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a connection that we already have. More...
 
void GCC_handle_kx (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
 Handle KX message. More...
 
void GCC_handle_kx_auth (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
 Handle KX_AUTH message. More...
 
const struct CadetConnectionMetricsGCC_get_metrics (struct CadetConnection *cc)
 Obtain performance metrics from cc. More...
 
void GCC_handle_encrypted (struct CadetConnection *cc, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
 Handle encrypted message. More...
 
void GCC_ack_expected (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
 We sent a message for which we expect to receive an ACK via the connection identified by cti. More...
 
void GCC_ack_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
 We observed an ACK for a message that was originally sent via the connection identified by cti. More...
 
void GCC_latency_observed (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cti, struct GNUNET_TIME_Relative latency)
 We observed some the given latency on the connection identified by cti. More...
 
struct CadetTConnectionGCC_get_ct (struct CadetConnection *cc)
 Return the tunnel associated with this connection. More...
 
struct CadetPeerPathGCC_get_path (struct CadetConnection *cc, unsigned int *off)
 Obtain the path used by this connection. More...
 
const struct GNUNET_CADET_ConnectionTunnelIdentifierGCC_get_id (struct CadetConnection *cc)
 Obtain unique ID for the connection. More...
 
const char * GCC_2s (const struct CadetConnection *cc)
 Get a (static) string for a connection. More...
 
void GCC_debug (struct CadetConnection *cc, enum GNUNET_ErrorType level)
 Log connection info. More...
 

Detailed Description

A connection is a live end-to-end messaging mechanism where the peers are identified by a path and know how to forward along the route using a connection identifier for routing the data.

Author
Bartlomiej Polot
Christian Grothoff

Definition in file gnunet-service-cadet_connection.h.

Typedef Documentation

◆ GCC_ReadyCallback

typedef void(* GCC_ReadyCallback) (void *cls, int is_ready)

Function called to notify tunnel about change in our readiness.

Parameters
clsclosure
is_readyGNUNET_YES if the connection is now ready for transmission, GNUNET_NO if the connection is no longer ready for transmission

Definition at line 46 of file gnunet-service-cadet_connection.h.

Function Documentation

◆ GCC_destroy_without_core()

void GCC_destroy_without_core ( struct CadetConnection cc)

Destroy a connection, called when the CORE layer is already done (i.e.

has received a BROKEN message), but if we still have to communicate the destruction of the connection to the tunnel (if one exists).

Parameters
ccconnection to destroy

Definition at line 284 of file gnunet-service-cadet_connection.c.

285 {
286  if (NULL != cc->ct)
287  {
288  GCT_connection_lost (cc->ct);
289  cc->ct = NULL;
290  }
291  GCC_destroy (cc);
292 }
static void GCC_destroy(struct CadetConnection *cc)
Destroy a connection, part of the internal implementation.
void GCT_connection_lost(struct CadetTConnection *ct)
We lost a connection, remove it from our list and clean up the connection object itself.
struct CadetTConnection * ct
Which tunnel is using this connection?

References CadetConnection::ct, GCC_destroy(), and GCT_connection_lost().

Referenced by handle_connection_broken(), and handle_connection_destroy().

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◆ GCC_destroy_without_tunnel()

void GCC_destroy_without_tunnel ( struct CadetConnection cc)

Destroy a connection, called if the tunnel association with the connection was already broken, but we still need to notify the CORE layer about the breakage.

Parameters
ccconnection to destroy

Definition at line 303 of file gnunet-service-cadet_connection.c.

304 {
305  cc->ct = NULL;
306  if ((CADET_CONNECTION_SENDING_CREATE != cc->state) && (NULL != cc->mq_man))
307  {
308  struct GNUNET_MQ_Envelope *env;
309  struct GNUNET_CADET_ConnectionDestroyMessage *destroy_msg;
310 
311  /* Need to notify next hop that we are down. */
312  env =
314  destroy_msg->cid = cc->cid;
316  cc->mq_man = NULL;
317  }
318  GCC_destroy (cc);
319 }
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
@ CADET_CONNECTION_SENDING_CREATE
Connection create message in queue, awaiting transmission by CORE.
void GCP_request_mq_cancel(struct GCP_MessageQueueManager *mqm, struct GNUNET_MQ_Envelope *last_env)
Stops message queue change notifications.
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:67
#define GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY
Request the destruction of a connection.
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
enum CadetConnectionState state
State of the connection.
struct GCP_MessageQueueManager * mq_man
Handle for calling GCP_request_mq_cancel() once we are finished.
Message to destroy a connection.
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.

References CADET_CONNECTION_SENDING_CREATE, GNUNET_CADET_ConnectionDestroyMessage::cid, CadetConnection::cid, CadetConnection::ct, env, GCC_destroy(), GCP_request_mq_cancel(), GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY, GNUNET_MQ_msg, CadetConnection::mq_man, and CadetConnection::state.

Referenced by destroy_t_connection(), and GCC_create_inbound().

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◆ GCC_lookup()

struct CadetConnection* GCC_lookup ( const struct GNUNET_CADET_ConnectionTunnelIdentifier cid)

Lookup a connection by its identifier.

Parameters
cididentifier to resolve
Returns
NULL if connection was not found

Definition at line 186 of file gnunet-service-cadet_connection.c.

187 {
189  &cid->connection_of_tunnel);
190 }
struct GNUNET_CONTAINER_MultiShortmap * connections
Map from struct GNUNET_CADET_ConnectionTunnelIdentifier hash codes to struct CadetConnection objects.
void * GNUNET_CONTAINER_multishortmap_get(const struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key)
Given a key find a value in the map matching the key.
struct GNUNET_ShortHashCode connection_of_tunnel

References CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, connections, and GNUNET_CONTAINER_multishortmap_get().

Referenced by data_sent_cb(), GCC_ack_expected(), GCC_ack_observed(), GCC_latency_observed(), handle_connection_broken(), handle_connection_create(), handle_connection_create_ack(), handle_connection_destroy(), handle_tunnel_encrypted(), handle_tunnel_kx(), and handle_tunnel_kx_auth().

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◆ GCC_create()

struct CadetConnection* GCC_create ( struct CadetPeer destination,
struct CadetPeerPath path,
unsigned int  off,
struct CadetTConnection ct,
GCC_ReadyCallback  ready_cb,
void *  ready_cb_cls 
)

Create a connection to destination via path and notify cb whenever we are ready for more data.

Parameters
destinationwhere to go
pathwhich path to take (may not be the full path)
offoffset of destination on path
ctwhich tunnel uses this connection
ready_cbfunction to call when ready to transmit
ready_cb_clsclosure for cb
Returns
handle to the connection
Parameters
destinationwhere to go
pathwhich path to take (may not be the full path)
offoffset of destination on path
cttunnel that uses the connection
ready_cbfunction to call when ready to transmit
ready_cb_clsclosure for cb
Returns
handle to the connection

Definition at line 959 of file gnunet-service-cadet_connection.c.

965 {
967 
969  return connection_create (destination,
970  path,
971  off,
972  ct,
973  &cid,
975  ready_cb,
976  ready_cb_cls);
977 }
@ CADET_CONNECTION_NEW
Uninitialized status, we have not yet even gotten the message queue.
static struct CadetConnection * connection_create(struct CadetPeer *destination, struct CadetPeerPath *path, unsigned int off, struct CadetTConnection *ct, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, enum CadetConnectionState init_state, GCC_ReadyCallback ready_cb, void *ready_cb_cls)
Create a connection to destination via path and notify cb whenever we are ready for more data.
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
@ GNUNET_CRYPTO_QUALITY_NONCE
Randomness for IVs etc.
Hash uniquely identifying a connection below a tunnel.

References CADET_CONNECTION_NEW, connection_create(), GNUNET_CRYPTO_QUALITY_NONCE, and GNUNET_CRYPTO_random_block().

Referenced by consider_path_cb().

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◆ GCC_create_inbound()

struct CadetConnection* GCC_create_inbound ( struct CadetPeer destination,
struct CadetPeerPath path,
struct CadetTConnection ct,
const struct GNUNET_CADET_ConnectionTunnelIdentifier cid,
GCC_ReadyCallback  ready_cb,
void *  ready_cb_cls 
)

Create a connection to destination via path and notify cb whenever we are ready for more data.

This is an inbound tunnel, so we must use the existing cid

Parameters
destinationwhere to go
pathwhich path to take (may not be the full path)
ctwhich tunnel uses this connection
ready_cbfunction to call when ready to transmit
ready_cb_clsclosure for cb
Returns
handle to the connection, NULL if we already have a connection that takes precedence on path

Definition at line 885 of file gnunet-service-cadet_connection.c.

891 {
892  struct CadetConnection *cc;
893  unsigned int off;
894 
896  GNUNET_assert (UINT_MAX != off);
898  if (NULL != cc)
899  {
900  int cmp;
901 
902  cmp = GNUNET_memcmp (cid, &cc->cid);
903  if (0 == cmp)
904  {
905  /* Two peers picked the SAME random connection identifier at the
906  same time for the same path? Must be malicious. Drop
907  connection (existing and inbound), even if it is the only
908  one. */
909  GNUNET_break_op (0);
910  GCT_connection_lost (cc->ct);
912  return NULL;
913  }
914  if (0 < cmp)
915  {
916  /* drop existing */
918  "Got two connections on %s, dropping my existing %s\n",
919  GCPP_2s (path),
920  GCC_2s (cc));
921  GCT_connection_lost (cc->ct);
923  }
924  else
925  {
926  /* keep existing */
928  "Got two connections on %s, keeping my existing %s\n",
929  GCPP_2s (path),
930  GCC_2s (cc));
931  return NULL;
932  }
933  }
934 
936  path,
937  off,
938  ct,
939  cid,
941  ready_cb,
942  ready_cb_cls);
943 }
const char * GCC_2s(const struct CadetConnection *cc)
Get a (static) string for a connection.
@ CADET_CONNECTION_CREATE_RECEIVED
We are an inbound connection, and received a CREATE.
void GCC_destroy_without_tunnel(struct CadetConnection *cc)
Destroy a connection, called if the tunnel association with the connection was already broken,...
#define LOG(level,...)
const char * GCPP_2s(struct CadetPeerPath *path)
Convert a path to a human-readable string.
struct CadetConnection * GCPP_get_connection(struct CadetPeerPath *path, struct CadetPeer *destination, unsigned int off)
Return connection to destination using path, or return NULL if no such connection exists.
unsigned int GCPP_find_peer(struct CadetPeerPath *path, struct CadetPeer *cp)
Find peer's offset on path.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
@ GNUNET_ERROR_TYPE_DEBUG
Low-level connection to a destination.
GCC_ReadyCallback ready_cb
Function to call once we are ready to transmit.
void * ready_cb_cls
Closure for ready_cb.
struct CadetPeerPath * path
Path we are using to our destination.
unsigned int off
Offset of our destination in path.
struct CadetPeer * destination
To which peer does this connection go?

References CADET_CONNECTION_CREATE_RECEIVED, CadetConnection::cid, connection_create(), CadetConnection::ct, CadetConnection::destination, GCC_2s(), GCC_destroy_without_tunnel(), GCPP_2s(), GCPP_find_peer(), GCPP_get_connection(), GCT_connection_lost(), GNUNET_assert, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_memcmp, LOG, CadetConnection::off, CadetConnection::path, CadetConnection::ready_cb, and CadetConnection::ready_cb_cls.

Referenced by GCT_add_inbound_connection().

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◆ GCC_transmit()

void GCC_transmit ( struct CadetConnection cc,
struct GNUNET_MQ_Envelope env 
)

Transmit message msg via connection cc.

Must only be called (once) after the connection has signalled that it is ready via the ready_cb. Clients can also use #GCC_is_ready() to check if the connection is right now ready for transmission.

Parameters
ccconnection identification
envenvelope with message to transmit; the #GNUNET_MQ_notify_send() must not have yet been used for the envelope. Also, the message better match the connection identifier of this connection...

Must only be called (once) after the connection has signalled that it is ready via the ready_cb. Clients can also use #GCC_is_ready() to check if the connection is right now ready for transmission.

Parameters
ccconnection identification
envenvelope with message to transmit; must NOT yet have a GNUNET_MQ_notify_sent() callback attached to it

Definition at line 991 of file gnunet-service-cadet_connection.c.

992 {
994  "Scheduling message for transmission on %s\n",
995  GCC_2s (cc));
999  cc->mqm_ready = GNUNET_NO;
1000  if (NULL != cc->task)
1001  {
1003  cc->task = NULL;
1004  }
1005  GCP_send (cc->mq_man, env);
1006 }
@ CADET_CONNECTION_READY
Connection confirmed, ready to carry traffic.
void GCP_send(struct GCP_MessageQueueManager *mqm, struct GNUNET_MQ_Envelope *env)
Send the message in env to cp.
@ GNUNET_YES
Definition: gnunet_common.h:97
@ GNUNET_NO
Definition: gnunet_common.h:94
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:972
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:86
struct GNUNET_TIME_Absolute last_use
When was this connection last used? (by us sending or receiving a PAYLOAD message on it)
struct CadetConnectionMetrics metrics
Performance metrics for this connection.
struct GNUNET_SCHEDULER_Task * task
Task for connection maintenance.
int mqm_ready
Are we ready to transmit via mq_man right now?

References CADET_CONNECTION_READY, env, GCC_2s(), GCP_send(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_NO, GNUNET_SCHEDULER_cancel(), GNUNET_TIME_absolute_get(), GNUNET_YES, CadetConnectionMetrics::last_use, LOG, CadetConnection::metrics, CadetConnection::mq_man, CadetConnection::mqm_ready, CadetConnection::state, and CadetConnection::task.

Referenced by send_kx(), send_kx_auth(), and try_send_normal_payload().

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◆ GCC_handle_connection_create_ack()

void GCC_handle_connection_create_ack ( struct CadetConnection cc)

A CREATE_ACK was received for this connection, process it.

Parameters
ccthe connection that got the ACK.

A CREATE_ACK was received for this connection, process it.

Process it.

Parameters
ccthe connection that got the ACK.

Definition at line 495 of file gnunet-service-cadet_connection.c.

496 {
498  "Received CADET_CONNECTION_CREATE_ACK for %s in state %d (%s)\n",
499  GCC_2s (cc),
500  cc->state,
501  (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
502  if (CADET_CONNECTION_READY == cc->state)
503  return; /* Duplicate ACK, ignore */
504  if (NULL != cc->task)
505  {
507  cc->task = NULL;
508  }
511  if ((NULL == cc->keepalive_qe) && (GNUNET_YES == cc->mqm_ready) &&
512  (NULL == cc->task))
513  cc->task =
515 }
struct GNUNET_TIME_Relative keepalive_period
How frequently do we send KEEPALIVE messages on idle connections?
static void update_state(struct CadetConnection *cc, enum CadetConnectionState new_state, int new_mqm_ready)
Update the connection state.
static void send_keepalive(void *cls)
Send a GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE through the tunnel to prevent it from timing out.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1269
struct GNUNET_TIME_Absolute age
When was this connection first established? (by us sending or receiving the CREATE_ACK for the first ...
struct CadetTunnelQueueEntry * keepalive_qe
Queue entry for keepalive messages.

References CadetConnectionMetrics::age, CADET_CONNECTION_READY, GCC_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_delayed(), GNUNET_SCHEDULER_cancel(), GNUNET_TIME_absolute_get(), GNUNET_YES, keepalive_period, CadetConnection::keepalive_qe, LOG, CadetConnection::metrics, CadetConnection::mqm_ready, send_keepalive(), CadetConnection::state, CadetConnection::task, and update_state().

Referenced by GCC_handle_encrypted(), GCC_handle_kx(), GCC_handle_kx_auth(), and handle_connection_create_ack().

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◆ GCC_handle_duplicate_create()

void GCC_handle_duplicate_create ( struct CadetConnection cc)

We got a GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE for a connection that we already have.

Either our ACK got lost or something is fishy. Consider retransmitting the ACK.

Parameters
ccconnection that got the duplicate CREATE

Definition at line 710 of file gnunet-service-cadet_connection.c.

711 {
712  if (GNUNET_YES == cc->mqm_ready)
713  {
715  "Got duplicate CREATE for %s, scheduling another ACK (%s)\n",
716  GCC_2s (cc),
717  (GNUNET_YES == cc->mqm_ready) ? "MQM ready" : "MQM busy");
718  /* Revert back to the state of having only received the 'CREATE',
719  and immediately proceed to send the CREATE_ACK. */
721  if (NULL != cc->task)
723  cc->task =
725  }
726  else
727  {
728  /* We are currently sending something else back, which
729  can only be an ACK or payload, either of which would
730  do. So actually no need to do anything. */
732  "Got duplicate CREATE for %s. MQ is busy, not queueing another ACK\n",
733  GCC_2s (cc));
734  }
735 }
static void send_create_ack(void *cls)
Send a CREATE_ACK message towards the origin.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1246
struct GNUNET_TIME_Absolute create_ack_at
Earliest time for re-trying CREATE_ACK.

References CADET_CONNECTION_CREATE_RECEIVED, CadetConnection::create_ack_at, GCC_2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, LOG, CadetConnection::mqm_ready, send_create_ack(), CadetConnection::task, and update_state().

Referenced by handle_connection_create().

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◆ GCC_handle_kx()

void GCC_handle_kx ( struct CadetConnection cc,
const struct GNUNET_CADET_TunnelKeyExchangeMessage msg 
)

Handle KX message.

Parameters
ccconnection that received encrypted message
msgthe key exchange message

Definition at line 525 of file gnunet-service-cadet_connection.c.

527 {
529  "Received KX message with ephermal %s on CC %s in state %d\n",
530  GNUNET_e2s (&msg->ephemeral_key),
532  cc->state);
533  if (CADET_CONNECTION_SENT == cc->state)
534  {
535  /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
536  clearly something is working, so pretend we got an ACK. */
538  "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
539  GCC_2s (cc));
541  }
542  GCT_handle_kx (cc->ct, msg);
543 }
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
void GCC_handle_connection_create_ack(struct CadetConnection *cc)
A GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK was received for this connection,...
@ CADET_CONNECTION_SENT
Connection create message sent, waiting for ACK.
void GCT_handle_kx(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
Handle KX message that lacks authentication (and which will thus only be considered authenticated aft...
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
const char * GNUNET_sh2s(const struct GNUNET_ShortHashCode *shc)
Convert a short hash value to a string (for printing debug messages).

References CADET_CONNECTION_SENT, CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_kx(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_sh2s(), LOG, msg, and CadetConnection::state.

Referenced by handle_tunnel_kx().

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◆ GCC_handle_kx_auth()

void GCC_handle_kx_auth ( struct CadetConnection cc,
const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage msg 
)

Handle KX_AUTH message.

Parameters
ccconnection that received encrypted message
msgthe key exchange message

Definition at line 553 of file gnunet-service-cadet_connection.c.

555 {
557  "Received KX AUTH message with ephermal %s on CC %s in state %d\n",
558  GNUNET_e2s (&msg->kx.ephemeral_key),
560  cc->state);
561  if (CADET_CONNECTION_SENT == cc->state)
562  {
563  /* We didn't get the CADET_CONNECTION_CREATE_ACK, but instead got payload. That's fine,
564  clearly something is working, so pretend we got an ACK. */
566  "Faking connection CADET_CONNECTION_CREATE_ACK for %s due to KX\n",
567  GCC_2s (cc));
569  }
570  GCT_handle_kx_auth (cc->ct, msg);
571 }
void GCT_handle_kx_auth(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
Handle KX_AUTH message.

References CADET_CONNECTION_SENT, CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_kx_auth(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_sh2s(), LOG, msg, and CadetConnection::state.

Referenced by handle_tunnel_kx_auth().

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◆ GCC_get_metrics()

const struct CadetConnectionMetrics* GCC_get_metrics ( struct CadetConnection cc)

Obtain performance metrics from cc.

Parameters
ccconnection to query
Returns
the metrics

Definition at line 342 of file gnunet-service-cadet_connection.c.

343 {
344  return &cc->metrics;
345 }

References CadetConnection::metrics.

Referenced by data_sent_cb(), and evaluate_connection().

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◆ GCC_handle_encrypted()

void GCC_handle_encrypted ( struct CadetConnection cc,
const struct GNUNET_CADET_TunnelEncryptedMessage msg 
)

Handle encrypted message.

Parameters
ccconnection that received encrypted message
msgthe encrypted message to decrypt

Definition at line 581 of file gnunet-service-cadet_connection.c.

583 {
584  if (CADET_CONNECTION_SENT == cc->state)
585  {
586  /* We didn't get the CREATE_ACK, but instead got payload. That's fine,
587  clearly something is working, so pretend we got an ACK. */
589  "Faking connection ACK for %s due to ENCRYPTED payload\n",
590  GCC_2s (cc));
592  }
594  GCT_handle_encrypted (cc->ct, msg);
595 }
void GCT_handle_encrypted(struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
Handle encrypted message.

References CADET_CONNECTION_SENT, CadetConnection::ct, GCC_2s(), GCC_handle_connection_create_ack(), GCT_handle_encrypted(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_TIME_absolute_get(), CadetConnectionMetrics::last_use, LOG, CadetConnection::metrics, msg, and CadetConnection::state.

Referenced by handle_tunnel_encrypted().

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◆ GCC_ack_expected()

void GCC_ack_expected ( const struct GNUNET_CADET_ConnectionTunnelIdentifier cid)

We sent a message for which we expect to receive an ACK via the connection identified by cti.

Parameters
cidconnection identifier where we expect an ACK

Definition at line 421 of file gnunet-service-cadet_connection.c.

422 {
423  struct CadetConnection *cc;
424 
425  cc = GCC_lookup (cid);
426  if (NULL == cc)
427  return; /* whopise, connection already down? */
429 }
struct CadetConnection * GCC_lookup(const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
Lookup a connection by its identifier.
unsigned long long num_acked_transmissions
How many packets that ought to generate an ACK did we send via this connection?

References CadetConnection::cid, GCC_lookup(), CadetConnection::metrics, and CadetConnectionMetrics::num_acked_transmissions.

Referenced by data_sent_cb().

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◆ GCC_ack_observed()

void GCC_ack_observed ( const struct GNUNET_CADET_ConnectionTunnelIdentifier cid)

We observed an ACK for a message that was originally sent via the connection identified by cti.

Parameters
cidconnection identifier where we got an ACK for a message that was originally sent via this connection (the ACK may have gotten back to us via a different connection).
cticonnection identifier where we got an ACK for a message that was originally sent via this connection (the ACK may have gotten back to us via a different connection).

Definition at line 441 of file gnunet-service-cadet_connection.c.

442 {
443  struct CadetConnection *cc;
444 
445  cc = GCC_lookup (cid);
446  if (NULL == cc)
447  return; /* whopise, connection already down? */
448  cc->metrics.num_successes++;
449 }
unsigned long long num_successes
Number of packets that were sent via this connection did actually receive an ACK? (Note: ACKs may be ...

References CadetConnection::cid, GCC_lookup(), CadetConnection::metrics, and CadetConnectionMetrics::num_successes.

Referenced by handle_matching_ack().

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◆ GCC_latency_observed()

void GCC_latency_observed ( const struct GNUNET_CADET_ConnectionTunnelIdentifier cid,
struct GNUNET_TIME_Relative  latency 
)

We observed some the given latency on the connection identified by cti.

(The same connection was taken in both directions.)

Parameters
cticonnection identifier where we measured latency
latencythe observed latency

(The same connection was taken in both directions.)

Parameters
cidconnection identifier where we measured latency
latencythe observed latency

Definition at line 461 of file gnunet-service-cadet_connection.c.

463 {
464  struct CadetConnection *cc;
465  double weight;
466  double result;
467 
468  cc = GCC_lookup (cid);
469  if (NULL == cc)
470  return; /* whopise, connection already down? */
471  GNUNET_STATISTICS_update (stats, "# latencies observed", 1, GNUNET_NO);
472  cc->latency_datapoints++;
473  if (cc->latency_datapoints >= 7)
474  weight = 7.0;
475  else
476  weight = cc->latency_datapoints;
477  /* Compute weighted average, giving at MOST weight 7 to the
478  existing values, or less if that value is based on fewer than 7
479  measurements. */
480  result = (weight * cc->metrics.aged_latency.rel_value_us)
481  + 1.0 * latency.rel_value_us;
482  result /= (weight + 1.0);
483  cc->metrics.aged_latency.rel_value_us = (uint64_t) result;
484 }
static int result
Global testing status.
struct GNUNET_STATISTICS_Handle * stats
Handle to the statistics service.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_TIME_Relative aged_latency
Our current best estimate of the latency, based on a weighted average of at least latency_datapoints ...
unsigned int latency_datapoints
How many latency observations did we make for this connection?
uint64_t rel_value_us
The actual value.

References CadetConnectionMetrics::aged_latency, CadetConnection::cid, GCC_lookup(), GNUNET_NO, GNUNET_STATISTICS_update(), CadetConnection::latency_datapoints, CadetConnection::metrics, GNUNET_TIME_Relative::rel_value_us, result, and stats.

Referenced by handle_matching_ack().

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◆ GCC_get_ct()

struct CadetTConnection* GCC_get_ct ( struct CadetConnection cc)

Return the tunnel associated with this connection.

Parameters
ccconnection to query
Returns
corresponding entry in the tunnel's connection list

Definition at line 329 of file gnunet-service-cadet_connection.c.

330 {
331  return cc->ct;
332 }

References CadetTConnection::cc, and CadetConnection::ct.

◆ GCC_get_path()

struct CadetPeerPath* GCC_get_path ( struct CadetConnection cc,
unsigned int *  off 
)

Obtain the path used by this connection.

Parameters
ccconnection
off[out]set to offset in this path where the connection cc ends
Returns
path to cc
Parameters
ccconnection
off[out]set to the length of the path we use
Returns
path to cc

Definition at line 1017 of file gnunet-service-cadet_connection.c.

1018 {
1019  *off = cc->off;
1020  return cc->path;
1021 }

References CadetConnection::off, and CadetConnection::path.

Referenced by evaluate_connection(), handle_connection_broken(), handle_connection_create_ack(), handle_connection_destroy(), handle_tunnel_encrypted(), handle_tunnel_kx(), and handle_tunnel_kx_auth().

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◆ GCC_get_id()

const struct GNUNET_CADET_ConnectionTunnelIdentifier* GCC_get_id ( struct CadetConnection cc)

Obtain unique ID for the connection.

Parameters
ccconnection.
Returns
unique number of the connection

Definition at line 1031 of file gnunet-service-cadet_connection.c.

1032 {
1033  return &cc->cid;
1034 }

References CadetConnection::cid.

Referenced by connection_create(), GCC_destroy(), GCP_add_connection(), GCP_remove_connection(), handle_plaintext_channel_destroy(), handle_plaintext_channel_open(), handle_plaintext_channel_open_ack(), handle_plaintext_data(), handle_plaintext_data_ack(), send_kx(), send_kx_auth(), and try_send_normal_payload().

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◆ GCC_2s()

const char* GCC_2s ( const struct CadetConnection cc)

Get a (static) string for a connection.

Parameters
ccConnection.

Definition at line 1043 of file gnunet-service-cadet_connection.c.

1044 {
1045  static char buf[128];
1046 
1047  if (NULL == cc)
1048  return "Connection(NULL)";
1049 
1050  if (NULL != cc->ct)
1051  {
1053  sizeof(buf),
1054  "Connection %s (%s)",
1056  GCT_2s (cc->ct->t));
1057  return buf;
1058  }
1060  sizeof(buf),
1061  "Connection %s",
1063  return buf;
1064 }
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
static char buf[2048]
int GNUNET_snprintf(char *buf, size_t size, const char *format,...) __attribute__((format(printf
Like snprintf, just aborts if the buffer is of insufficient size.
struct CadetTunnel * t
Tunnel this connection belongs to.

References buf, CadetConnection::cid, GNUNET_CADET_ConnectionTunnelIdentifier::connection_of_tunnel, CadetConnection::ct, GCT_2s(), GNUNET_sh2s(), GNUNET_snprintf(), and CadetTConnection::t.

Referenced by connection_create(), connection_ready_cb(), consider_path_cb(), evaluate_connection(), GCC_create_inbound(), GCC_destroy(), GCC_handle_connection_create_ack(), GCC_handle_duplicate_create(), GCC_handle_encrypted(), GCC_handle_kx(), GCC_handle_kx_auth(), GCC_transmit(), GCP_add_connection(), GCP_remove_connection(), GCPP_add_connection(), GCPP_del_connection(), GCT_add_inbound_connection(), GCT_handle_kx(), manage_first_hop_mq(), send_create(), send_create_ack(), send_keepalive(), and try_send_normal_payload().

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◆ GCC_debug()

void GCC_debug ( struct CadetConnection cc,
enum GNUNET_ErrorType  level 
)

Log connection info.

Parameters
ccconnection
levelDebug level to use.

Definition at line 1078 of file gnunet-service-cadet_connection.c.

1079 {
1080 #if ! defined(GNUNET_CULL_LOGGING)
1081  int do_log;
1082 
1084  "cadet-con",
1085  __FILE__,
1086  __FUNCTION__,
1087  __LINE__);
1088  if (0 == do_log)
1089  return;
1090  if (NULL == cc)
1091  {
1092  LOG2 (level, "Connection (NULL)\n");
1093  return;
1094  }
1095  LOG2 (level,
1096  "%s to %s via path %s in state %d is %s\n",
1097  GCC_2s (cc),
1098  GCP_2s (cc->destination),
1099  GCPP_2s (cc->path),
1100  cc->state,
1101  (GNUNET_YES == cc->mqm_ready) ? "ready" : "busy");
1102 #endif
1103 }
#define LOG2(level,...)
const char * GCP_2s(const struct CadetPeer *cp)
Get the static string for a peer ID.
int GNUNET_get_log_call_status(int caller_level, const char *comp, const char *file, const char *function, int line)
Decides whether a particular logging call should or should not be allowed to be made.
@ GNUNET_ERROR_TYPE_BULK

Referenced by GCT_debug().

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