GNUnet  0.10.x
Macros | Typedefs | Enumerations | Functions
gnunet-service-cadet_tunnels.h File Reference

Information we track per tunnel. More...

#include "gnunet-service-cadet.h"
#include "cadet_protocol.h"
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Macros

#define DESIRED_CONNECTIONS_PER_TUNNEL   3
 How many connections would we like to have per tunnel? More...
 

Typedefs

typedef void(* GCT_SendContinuation) (void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
 Function called when a transmission requested using GCT_send is done. More...
 
typedef void(* GCT_ConnectionIterator) (void *cls, struct CadetTConnection *ct)
 Iterator over connections. More...
 
typedef void(* GCT_ChannelIterator) (void *cls, struct CadetChannel *ch)
 Iterator over channels. More...
 

Enumerations

enum  CadetTunnelEState {
  CADET_TUNNEL_KEY_UNINITIALIZED, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT_AND_RECV,
  CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_OK
}
 All the encryption states a tunnel can be in. More...
 

Functions

const char * GCT_2s (const struct CadetTunnel *t)
 Get the static string for the peer this tunnel is directed. More...
 
struct CadetTunnelGCT_create_tunnel (struct CadetPeer *destination)
 Create a tunnel to destionation. More...
 
void GCT_destroy_tunnel_now (struct CadetTunnel *t)
 Destroys the tunnel t now, without delay. More...
 
int GCT_add_inbound_connection (struct CadetTunnel *t, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid, struct CadetPeerPath *path)
 Add a connection to the tunnel. More...
 
void GCT_connection_lost (struct CadetTConnection *ct)
 We lost a connection, remove it from our list and clean up the connection object itself. More...
 
struct CadetPeerGCT_get_destination (struct CadetTunnel *t)
 Return the peer to which this tunnel goes. More...
 
void GCT_consider_path (struct CadetTunnel *t, struct CadetPeerPath *p, unsigned int off)
 Consider using the path p for the tunnel t. More...
 
struct GNUNET_CADET_ChannelTunnelNumber GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
 Add a channel to a tunnel. More...
 
void GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch, struct GNUNET_CADET_ChannelTunnelNumber ctn)
 Remove a channel from a tunnel. More...
 
void GCT_send_channel_destroy (struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn)
 Send a DESTROY message via the tunnel. More...
 
struct CadetTunnelQueueEntryGCT_send (struct CadetTunnel *t, const struct GNUNET_MessageHeader *message, GCT_SendContinuation cont, void *cont_cls)
 Sends an already built message on a tunnel, encrypting it and choosing the best connection if not provided. More...
 
void GCT_send_cancel (struct CadetTunnelQueueEntry *q)
 Cancel a previously sent message while it's in the queue. More...
 
unsigned int GCT_count_channels (struct CadetTunnel *t)
 Return the number of channels using a tunnel. More...
 
unsigned int GCT_count_any_connections (const struct CadetTunnel *t)
 Return the number of connections available for a tunnel. More...
 
void GCT_iterate_connections (struct CadetTunnel *t, GCT_ConnectionIterator iter, void *iter_cls)
 Iterate over all connections of a tunnel. More...
 
void GCT_iterate_channels (struct CadetTunnel *t, GCT_ChannelIterator iter, void *iter_cls)
 Iterate over all channels of a tunnel. More...
 
enum CadetTunnelEState GCT_get_estate (struct CadetTunnel *t)
 Get the encryption state of a tunnel. More...
 
void GCT_handle_kx (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
 Handle KX message. More...
 
void GCT_handle_kx_auth (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage *msg)
 Handle KX_AUTH message. More...
 
void GCT_handle_encrypted (struct CadetTConnection *ct, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
 Handle encrypted message. More...
 
void GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
 Log all possible info about the tunnel state. More...
 

Detailed Description

Information we track per tunnel.

Author
Bartlomiej Polot
Christian Grothoff

Definition in file gnunet-service-cadet_tunnels.h.

Macro Definition Documentation

◆ DESIRED_CONNECTIONS_PER_TUNNEL

#define DESIRED_CONNECTIONS_PER_TUNNEL   3

How many connections would we like to have per tunnel?

Definition at line 38 of file gnunet-service-cadet_tunnels.h.

Referenced by consider_path_cb(), consider_peer_activate(), GCP_attach_path(), GCP_path_entry_remove(), maintain_connections_cb(), and path_heap_cleanup().

Typedef Documentation

◆ GCT_SendContinuation

typedef void(* GCT_SendContinuation) (void *cls, const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)

Function called when a transmission requested using GCT_send is done.

Parameters
clsclosure
ctnidentifier of the connection used for transmission, NULL if the transmission failed (to be used to match ACKs to the respective connection for connection performance evaluation)

Definition at line 209 of file gnunet-service-cadet_tunnels.h.

◆ GCT_ConnectionIterator

typedef void(* GCT_ConnectionIterator) (void *cls, struct CadetTConnection *ct)

Iterator over connections.

Parameters
clsclosure
ctone of the connections

Definition at line 270 of file gnunet-service-cadet_tunnels.h.

◆ GCT_ChannelIterator

typedef void(* GCT_ChannelIterator) (void *cls, struct CadetChannel *ch)

Iterator over channels.

Parameters
clsclosure
chone of the channels

Definition at line 294 of file gnunet-service-cadet_tunnels.h.

Enumeration Type Documentation

◆ CadetTunnelEState

All the encryption states a tunnel can be in.

Enumerator
CADET_TUNNEL_KEY_UNINITIALIZED 

Uninitialized status, we need to send KX.

We will stay in this state until the first connection is up.

CADET_TUNNEL_KEY_AX_SENT 

KX message sent, waiting for other peer's KX_AUTH.

CADET_TUNNEL_KEY_AX_RECV 

KX message received, trying to send back KX_AUTH.

CADET_TUNNEL_KEY_AX_SENT_AND_RECV 

KX message sent and received, trying to send back KX_AUTH.

CADET_TUNNEL_KEY_AX_AUTH_SENT 

KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH or ENCRYPED traffic from the other peer.

We will not yet send traffic, as this might have been a replay. The other (initiating) peer should send a CHANNEL_OPEN next anyway, and then we are in business!

CADET_TUNNEL_KEY_OK 

Handshake completed: session key available.

Definition at line 44 of file gnunet-service-cadet_tunnels.h.

44  {
50 
55 
60 
65 
76 
81 };
KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH ...
KX message sent, waiting for other peer's KX_AUTH.
Handshake completed: session key available.
KX message sent and received, trying to send back KX_AUTH.
Uninitialized status, we need to send KX.
KX message received, trying to send back KX_AUTH.

Function Documentation

◆ GCT_2s()

const char* GCT_2s ( const struct CadetTunnel t)

Get the static string for the peer this tunnel is directed.

Parameters
tTunnel.
Returns
Static string the destination peer's ID.

Definition at line 511 of file gnunet-service-cadet_tunnels.c.

References buf, CadetTunnel::destination, GCP_get_id(), GNUNET_i2s(), and GNUNET_snprintf().

Referenced by connection_ready_cb(), consider_path_cb(), destroy_tunnel(), GCC_2s(), GCCH_bind(), GCCH_channel_local_new(), GCCH_debug(), GCP_drop_tunnel(), GCT_add_channel(), GCT_add_inbound_connection(), GCT_change_estate(), GCT_consider_path(), GCT_debug(), GCT_handle_encrypted(), GCT_handle_kx(), GCT_handle_kx_auth(), GCT_remove_channel(), GCT_send(), handle_plaintext_channel_destroy(), handle_plaintext_channel_open(), handle_plaintext_channel_open_ack(), handle_plaintext_keepalive(), maintain_connections_cb(), retry_kx(), send_keepalive(), send_kx(), send_kx_auth(), and try_send_normal_payload().

512 {
513  static char buf[64];
514 
515  if (NULL == t)
516  return "Tunnel(NULL)";
517  GNUNET_snprintf(buf,
518  sizeof(buf),
519  "Tunnel %s",
521  return buf;
522 }
int GNUNET_snprintf(char *buf, size_t size, const char *format,...)
Like snprintf, just aborts if the buffer is of insufficient size.
static char buf[2048]
struct CadetPeer * destination
Destination of the tunnel.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
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◆ GCT_create_tunnel()

struct CadetTunnel* GCT_create_tunnel ( struct CadetPeer destination)

Create a tunnel to destionation.

Must only be called from within GCP_get_tunnel().

Parameters
destinationwhere to create the tunnel to
Returns
new tunnel to destination

Definition at line 3147 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::ax, CadetTunnel::channels, decrypted_error_cb(), CadetTunnel::destination, GNUNET_assert, GNUNET_CONTAINER_multihashmap32_create(), GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK, GNUNET_MQ_handler_end, GNUNET_MQ_hd_fixed_size, GNUNET_MQ_hd_var_size, GNUNET_MQ_queue_for_callbacks(), GNUNET_MST_create(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_now(), handle_decrypted(), INITIAL_KX_RETRY_DELAY, CadetTunnelAxolotl::kx_0, CadetTunnel::kx_retry_delay, maintain_connections_cb(), CadetTunnel::maintain_connections_task, CadetTunnel::mq, CadetTunnel::mst, new_ephemeral(), and t.

Referenced by GCP_get_tunnel().

3148 {
3149  struct CadetTunnel *t = GNUNET_new(struct CadetTunnel);
3150  struct GNUNET_MQ_MessageHandler handlers[] = {
3151  GNUNET_MQ_hd_fixed_size(plaintext_keepalive,
3153  struct GNUNET_MessageHeader,
3154  t),
3155  GNUNET_MQ_hd_var_size(plaintext_data,
3158  t),
3159  GNUNET_MQ_hd_fixed_size(plaintext_data_ack,
3162  t),
3163  GNUNET_MQ_hd_fixed_size(plaintext_channel_open,
3166  t),
3167  GNUNET_MQ_hd_fixed_size(plaintext_channel_open_ack,
3170  t),
3171  GNUNET_MQ_hd_fixed_size(plaintext_channel_destroy,
3174  t),
3176  };
3177 
3179  new_ephemeral(&t->ax);
3182  t->destination = destination;
3186  t);
3188  NULL,
3189  NULL,
3190  NULL,
3191  handlers,
3193  t);
3195  t);
3196  return t;
3197 }
struct CadetTunnelAxolotl ax
Axolotl info.
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:632
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
struct GNUNET_MQ_Handle * mq
Dispatcher for decrypted messages only (do NOT use for sending!).
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK
Confirm the creation of a channel.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY
Ask the cadet service to destroy a channel.
#define GNUNET_MQ_hd_fixed_size(name, code, str, ctx)
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static struct GNUNET_SCHEDULER_Task * t
Main task.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA
Payload data (inside an encrypted tunnel).
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN
Ask the cadet service to create a new channel.
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:550
static struct GNUNET_CADET_MessageHandler handlers[]
Handlers, for diverse services.
#define GNUNET_MQ_hd_var_size(name, code, str, ctx)
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
#define INITIAL_KX_RETRY_DELAY
How long do we wait initially before retransmitting the KX? TODO: replace by 2 RTT if/once we have co...
struct GNUNET_MessageStreamTokenizer * GNUNET_MST_create(GNUNET_MessageTokenizerCallback cb, void *cb_cls)
Create a message stream tokenizer.
Definition: mst.c:84
struct GNUNET_MessageStreamTokenizer * mst
Tokenizer for decrypted messages.
Message for cadet data traffic.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE
Announce connection is still alive (direction sensitive).
Message handler for a specific message type.
struct GNUNET_CONTAINER_MultiHashMap32 * GNUNET_CONTAINER_multihashmap32_create(unsigned int len)
Create a 32-bit key multi hash map.
Struct containing all information regarding a tunnel to a peer.
Message to acknowledge end-to-end data.
static void decrypted_error_cb(void *cls, enum GNUNET_MQ_Error error)
Function called if we had an error processing an incoming decrypted message.
Message to acknowledge opening a channel of type GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK.
Message to create a Channel.
Message to destroy a channel of type GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY.
static void maintain_connections_cb(void *cls)
Function called to maintain the connections underlying our tunnel.
struct CadetPeer * destination
Destination of the tunnel.
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK
Confirm payload data end-to-end.
struct GNUNET_SCHEDULER_Task * maintain_connections_task
Task to trim connections if too many are present.
static int handle_decrypted(void *cls, const struct GNUNET_MessageHeader *msg)
Handles a message we decrypted, by injecting it into our message queue (which will do the dispatching...
struct GNUNET_TIME_Relative kx_retry_delay
How long do we wait until we retry the KX?
Header for all communications.
static void new_ephemeral(struct CadetTunnelAxolotl *ax)
Create a new Axolotl ephemeral (ratchet) key.
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
struct GNUNET_CRYPTO_EcdhePrivateKey kx_0
ECDH for key exchange (A0 / B0).
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◆ GCT_destroy_tunnel_now()

void GCT_destroy_tunnel_now ( struct CadetTunnel t)

Destroys the tunnel t now, without delay.

Used during shutdown.

Parameters
ttunnel to destroy

Definition at line 2324 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::channels, destroy_remaining_channels(), CadetTunnel::destroy_task, destroy_tunnel(), GCT_count_channels(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_iterate(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, and shutting_down.

Referenced by destroy_tunnels_now().

2325 {
2329  t);
2330  GNUNET_assert(0 ==
2331  GCT_count_channels(t));
2332  if (NULL != t->destroy_task)
2333  {
2335  t->destroy_task = NULL;
2336  }
2337  destroy_tunnel(t);
2338 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_MulitHashMapIterator32Callback it, void *it_cls)
Iterate over all entries in the map.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_SCHEDULER_Task * destroy_task
Task scheduled if there are no more channels using the tunnel.
static void destroy_tunnel(void *cls)
This tunnel is no longer used, destroy it.
static int destroy_remaining_channels(void *cls, uint32_t key, void *value)
Destroy remaining channels during shutdown.
int shutting_down
Signal that shutdown is happening: prevent recovery measures.
unsigned int GCT_count_channels(struct CadetTunnel *t)
Count channels of a tunnel.
#define GNUNET_YES
Definition: gnunet_common.h:77
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ GCT_add_inbound_connection()

int GCT_add_inbound_connection ( struct CadetTunnel t,
const struct GNUNET_CADET_ConnectionTunnelIdentifier cid,
struct CadetPeerPath path 
)

Add a connection to the tunnel.

Parameters
ta tunnel
cidconnection identifer to use for the connection
pathpath to use for the connection
Returns
GNUNET_OK on success, GNUNET_SYSERR on failure (duplicate connection)
Parameters
ta tunnel
cidconnection identifer to use for the connection
optionsoptions for the connection
pathpath to use for the connection
Returns
GNUNET_OK on success, GNUNET_SYSERR on failure (duplicate connection)

Definition at line 3211 of file gnunet-service-cadet_tunnels.c.

References CadetTConnection::cc, CadetTunnel::connection_busy_head, CadetTunnel::connection_busy_tail, connection_ready_cb(), CadetTConnection::created, CadetTunnel::destination, GCC_2s(), GCC_create_inbound(), GCT_2s(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_new, GNUNET_OK, GNUNET_SYSERR, GNUNET_TIME_absolute_get(), LOG, CadetTunnel::num_busy_connections, t, and CadetTConnection::t.

Referenced by handle_connection_create().

3214 {
3215  struct CadetTConnection *ct;
3216 
3217  ct = GNUNET_new(struct CadetTConnection);
3219  ct->t = t;
3221  path,
3222  ct,
3223  cid,
3225  ct);
3226  if (NULL == ct->cc)
3227  {
3229  "%s refused inbound %s (duplicate)\n",
3230  GCT_2s(t),
3231  GCC_2s(ct->cc));
3232  GNUNET_free(ct);
3233  return GNUNET_SYSERR;
3234  }
3235  /* FIXME: schedule job to kill connection (and path?) if it takes
3236  too long to get ready! (And track performance data on how long
3237  other connections took with the tunnel!)
3238  => Note: to be done within 'connection'-logic! */
3241  ct);
3242  t->num_busy_connections++;
3244  "%s has new %s\n",
3245  GCT_2s(t),
3246  GCC_2s(ct->cc));
3247  return GNUNET_OK;
3248 }
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
const char * GCC_2s(const struct CadetConnection *cc)
Get a (static) string for a connection.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static struct GNUNET_SCHEDULER_Task * t
Main task.
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...
struct CadetTConnection * connection_busy_head
DLL of connections that we maintain that might be used to reach the destination peer.
struct CadetTunnel * t
Tunnel this connection belongs to.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:118
struct CadetConnection * cc
Connection handle.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
Entry in list of connections used by tunnel, with metadata.
struct CadetPeer * destination
Destination of the tunnel.
static void connection_ready_cb(void *cls, int is_ready)
A connection is is_ready for transmission.
struct GNUNET_TIME_Absolute created
Creation time, to keep oldest connection alive.
#define LOG(level,...)
unsigned int num_busy_connections
Number of connections in the connection_busy_head DLL.
struct CadetTConnection * connection_busy_tail
DLL of connections that we maintain that might be used to reach the destination peer.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GCT_connection_lost()

void GCT_connection_lost ( struct CadetTConnection ct)

We lost a connection, remove it from our list and clean up the connection object itself.

Parameters
ctbinding of connection to tunnel of the connection that was lost.

Definition at line 2165 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::connection_busy_head, CadetTunnel::connection_busy_tail, CadetTunnel::connection_ready_head, CadetTunnel::connection_ready_tail, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_YES, CadetTConnection::is_ready, CadetTunnel::num_busy_connections, CadetTunnel::num_ready_connections, and CadetTConnection::t.

Referenced by destroy_t_connection(), GCC_create_inbound(), and GCC_destroy_without_core().

2166 {
2167  struct CadetTunnel *t = ct->t;
2168 
2169  if (GNUNET_YES == ct->is_ready)
2170  {
2173  ct);
2174  t->num_ready_connections--;
2175  }
2176  else
2177  {
2180  ct);
2181  t->num_busy_connections--;
2182  }
2183  GNUNET_free(ct);
2184 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct CadetTConnection * connection_ready_tail
DLL of ready connections that are actively used to reach the destination peer.
int is_ready
Is the connection currently ready for transmission?
unsigned int num_ready_connections
Number of connections in the connection_ready_head DLL.
struct CadetTConnection * connection_ready_head
DLL of ready connections that are actively used to reach the destination peer.
static struct GNUNET_SCHEDULER_Task * t
Main task.
struct CadetTConnection * connection_busy_head
DLL of connections that we maintain that might be used to reach the destination peer.
struct CadetTunnel * t
Tunnel this connection belongs to.
Struct containing all information regarding a tunnel to a peer.
#define GNUNET_YES
Definition: gnunet_common.h:77
unsigned int num_busy_connections
Number of connections in the connection_busy_head DLL.
struct CadetTConnection * connection_busy_tail
DLL of connections that we maintain that might be used to reach the destination peer.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GCT_get_destination()

struct CadetPeer* GCT_get_destination ( struct CadetTunnel t)

Return the peer to which this tunnel goes.

Parameters
ta tunnel
Returns
the destination of the tunnel

Definition at line 574 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::destination.

Referenced by GCCH_2s(), GCCH_bind(), GCCH_channel_incoming_new(), get_next_free_ctn(), and timeout_closed_cb().

575 {
576  return t->destination;
577 }
struct CadetPeer * destination
Destination of the tunnel.
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◆ GCT_consider_path()

void GCT_consider_path ( struct CadetTunnel t,
struct CadetPeerPath p,
unsigned int  off 
)

Consider using the path p for the tunnel t.

The tunnel destination is at offset off in path p.

Parameters
clsour tunnel
patha path to our destination
offoffset of the destination on path path

Definition at line 2835 of file gnunet-service-cadet_tunnels.c.

References consider_path_cb(), GCPP_2s(), GCT_2s(), GNUNET_ERROR_TYPE_DEBUG, and LOG.

Referenced by GCP_path_entry_add(), and GCP_set_mq().

2838 {
2840  "Considering %s for %s (offset %u)\n",
2841  GCPP_2s(p),
2842  GCT_2s(t),
2843  off);
2844  (void)consider_path_cb(t,
2845  p,
2846  off);
2847 }
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
const char * GCPP_2s(struct CadetPeerPath *path)
Convert a path to a human-readable string.
static int consider_path_cb(void *cls, struct CadetPeerPath *path, unsigned int off)
Consider using the path p for the tunnel t.
#define LOG(level,...)
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◆ GCT_add_channel()

struct GNUNET_CADET_ChannelTunnelNumber GCT_add_channel ( struct CadetTunnel t,
struct CadetChannel ch 
)

Add a channel to a tunnel.

Parameters
tTunnel.
chChannel
Returns
unique number identifying ch within t

Add a channel to a tunnel.

Otherwise that notification will be done later in notify_tunnel_up_cb().

Parameters
tTunnel.
chChannel
Returns
unique number identifying ch within t

Definition at line 2107 of file gnunet-service-cadet_tunnels.c.

References CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, ch, GCCH_2s(), GCCH_tunnel_up(), GCT_2s(), get_next_free_ctn(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_at(), GNUNET_SCHEDULER_cancel(), GNUNET_YES, LOG, and retry_kx().

Referenced by GCCH_channel_local_new().

2109 {
2111 
2112  ctn = get_next_free_ctn(t);
2113  if (NULL != t->destroy_task)
2114  {
2116  t->destroy_task = NULL;
2117  }
2120  ntohl(ctn.cn),
2121  ch,
2124  "Adding %s to %s\n",
2125  GCCH_2s(ch),
2126  GCT_2s(t));
2127  switch (t->estate)
2128  {
2130  /* waiting for connection to start KX */
2131  break;
2132 
2136  /* we're currently waiting for KX to complete */
2137  break;
2138 
2140  /* waiting for OTHER peer to send us data,
2141  we might need to prompt more aggressively! */
2142  if (NULL == t->kx_task)
2143  t->kx_task
2145  &retry_kx,
2146  t);
2147  break;
2148 
2149  case CADET_TUNNEL_KEY_OK:
2150  /* We are ready. Tell the new channel that we are up. */
2151  GCCH_tunnel_up(ch);
2152  break;
2153  }
2154  return ctn;
2155 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
void GCCH_tunnel_up(struct CadetChannel *ch)
Function called once and only once after a channel was bound to its tunnel via GCT_add_channel() is r...
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH ...
KX message sent, waiting for other peer's KX_AUTH.
struct GNUNET_SCHEDULER_Task * destroy_task
Task scheduled if there are no more channels using the tunnel.
int GNUNET_CONTAINER_multihashmap32_put(struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
struct GNUNET_SCHEDULER_Task * kx_task
Task to trigger KX.
There must only be one value per key; storing a value should fail if a value under the same key alrea...
struct GNUNET_TIME_Absolute next_kx_attempt
When do we try the next KX?
Handshake completed: session key available.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
KX message sent and received, trying to send back KX_AUTH.
Number identifying a CADET channel within a tunnel.
static void retry_kx(void *cls)
Try to redo the KX or KX_AUTH handshake, if we can.
Uninitialized status, we need to send KX.
#define LOG(level,...)
KX message received, trying to send back KX_AUTH.
#define GNUNET_YES
Definition: gnunet_common.h:77
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:1214
enum CadetTunnelEState estate
State of the tunnel encryption.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
static struct GNUNET_CADET_ChannelTunnelNumber get_next_free_ctn(struct CadetTunnel *t)
Compute the next free channel tunnel number for this tunnel.
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◆ GCT_remove_channel()

void GCT_remove_channel ( struct CadetTunnel t,
struct CadetChannel ch,
struct GNUNET_CADET_ChannelTunnelNumber  ctn 
)

Remove a channel from a tunnel.

Parameters
tTunnel.
chChannel
ctnunique number identifying ch within t

Definition at line 2273 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::channels, GNUNET_CADET_ChannelTunnelNumber::cn, CadetTunnel::destroy_task, destroy_tunnel(), GCCH_2s(), GCT_2s(), GCT_count_channels(), GNUNET_assert, GNUNET_CONTAINER_multihashmap32_remove(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_SCHEDULER_add_delayed(), GNUNET_YES, IDLE_DESTROY_DELAY, and LOG.

Referenced by channel_destroy().

2276 {
2278  "Removing %s from %s\n",
2279  GCCH_2s(ch),
2280  GCT_2s(t));
2283  ntohl(ctn.cn),
2284  ch));
2285  if ((0 ==
2286  GCT_count_channels(t)) &&
2287  (NULL == t->destroy_task))
2288  {
2289  t->destroy_task
2291  &destroy_tunnel,
2292  t);
2293  }
2294 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
uint32_t cn
Which number does this channel have that uniquely identfies it within its tunnel, in network byte ord...
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_SCHEDULER_Task * destroy_task
Task scheduled if there are no more channels using the tunnel.
static void destroy_tunnel(void *cls)
This tunnel is no longer used, destroy it.
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:1237
int GNUNET_CONTAINER_multihashmap32_remove(struct GNUNET_CONTAINER_MultiHashMap32 *map, uint32_t key, const void *value)
Remove the given key-value pair from the map.
const char * GCCH_2s(const struct CadetChannel *ch)
Get the static string for identification of the channel.
unsigned int GCT_count_channels(struct CadetTunnel *t)
Count channels of a tunnel.
#define LOG(level,...)
#define GNUNET_YES
Definition: gnunet_common.h:77
#define IDLE_DESTROY_DELAY
How long do we wait until tearing down an idle tunnel?
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◆ GCT_send_channel_destroy()

void GCT_send_channel_destroy ( struct CadetTunnel t,
struct GNUNET_CADET_ChannelTunnelNumber  ctn 
)

Send a DESTROY message via the tunnel.

Parameters
tthe tunnel to transmit over
ctnID of the channel to destroy

Definition at line 3010 of file gnunet-service-cadet_tunnels.c.

References GNUNET_CADET_ChannelTunnelNumber::cn, GNUNET_CADET_ChannelDestroyMessage::ctn, GCT_send(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY, GNUNET_CADET_ChannelDestroyMessage::header, LOG, GNUNET_CADET_ChannelDestroyMessage::reserved, GNUNET_MessageHeader::size, and GNUNET_MessageHeader::type.

Referenced by GCCH_channel_local_destroy(), GCCH_handle_channel_plaintext_data(), GCCH_handle_local_ack(), handle_plaintext_channel_open_ack(), handle_plaintext_data(), and handle_plaintext_data_ack().

3012 {
3014 
3016  "Sending DESTORY message for channel ID %u\n",
3017  ntohl(ctn.cn));
3018  msg.header.size = htons(sizeof(msg));
3020  msg.reserved = htonl(0);
3021  msg.ctn = ctn;
3022  GCT_send(t,
3023  &msg.header,
3024  NULL,
3025  NULL);
3026 }
uint32_t cn
Which number does this channel have that uniquely identfies it within its tunnel, in network byte ord...
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
struct GNUNET_CADET_ChannelTunnelNumber ctn
ID of the channel.
struct CadetTunnelQueueEntry * GCT_send(struct CadetTunnel *t, const struct GNUNET_MessageHeader *message, GCT_SendContinuation cont, void *cont_cls)
Sends an already built message on a tunnel, encrypting it and choosing the best connection if not pro...
#define GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY
Ask the cadet service to destroy a channel.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
Message to destroy a channel of type GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY.
#define LOG(level,...)
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◆ GCT_send()

struct CadetTunnelQueueEntry* GCT_send ( struct CadetTunnel t,
const struct GNUNET_MessageHeader message,
GCT_SendContinuation  cont,
void *  cont_cls 
)

Sends an already built message on a tunnel, encrypting it and choosing the best connection if not provided.

Parameters
messageMessage to send. Function modifies it.
tTunnel on which this message is transmitted.
contContinuation to call once message is really sent.
cont_clsClosure for cont.
Returns
Handle to cancel message.
Parameters
messageMessage to send. Function modifies it.
tTunnel on which this message is transmitted.
contContinuation to call once message is really sent.
cont_clsClosure for cont.
Returns
Handle to cancel message

Definition at line 3444 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::ax, GNUNET_CADET_TunnelEncryptedMessage::ax_header, CADET_TUNNEL_KEY_OK, CadetTunnelQueueEntry::cid, GNUNET_CADET_TunnelEncryptedMessage::cid, CadetTunnelQueueEntry::cont, CadetTunnelQueueEntry::cont_cls, CadetTunnelAxolotl::DHRs, GNUNET_CADET_AxHeader::DHRs, env, CadetTunnelQueueEntry::env, CadetTunnel::estate, GCT_2s(), GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_malloc, GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED, GNUNET_MQ_msg_extra, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), CadetTunnelAxolotl::HKs, GNUNET_CADET_TunnelEncryptedMessage::hmac, LOG, CadetTunnelAxolotl::Ns, GNUNET_CADET_AxHeader::Ns, CadetTunnelAxolotl::PNs, GNUNET_CADET_AxHeader::PNs, CadetTunnel::send_task, GNUNET_MessageHeader::size, stats, t, CadetTunnelQueueEntry::t, t_ax_encrypt(), t_h_encrypt(), t_hmac(), CadetTunnel::tq_head, CadetTunnel::tq_tail, and trigger_transmissions().

Referenced by GCCH_handle_local_data(), GCT_send_channel_destroy(), retry_transmission(), send_channel_data_ack(), send_channel_open(), send_keepalive(), and send_open_ack().

3448 {
3449  struct CadetTunnelQueueEntry *tq;
3450  uint16_t payload_size;
3451  struct GNUNET_MQ_Envelope *env;
3452  struct GNUNET_CADET_TunnelEncryptedMessage *ax_msg;
3453 
3454  if (CADET_TUNNEL_KEY_OK != t->estate)
3455  {
3456  GNUNET_break(0);
3457  return NULL;
3458  }
3459  payload_size = ntohs(message->size);
3461  "Encrypting %u bytes for %s\n",
3462  (unsigned int)payload_size,
3463  GCT_2s(t));
3464  env = GNUNET_MQ_msg_extra(ax_msg,
3465  payload_size,
3467  t_ax_encrypt(&t->ax,
3468  &ax_msg[1],
3469  message,
3470  payload_size);
3472  "# encrypted bytes",
3473  payload_size,
3474  GNUNET_NO);
3475  ax_msg->ax_header.Ns = htonl(t->ax.Ns++);
3476  ax_msg->ax_header.PNs = htonl(t->ax.PNs);
3477  /* FIXME: we should do this once, not once per message;
3478  this is a point multiplication, and DHRs does not
3479  change all the time. */
3481  &ax_msg->ax_header.DHRs);
3482  t_h_encrypt(&t->ax,
3483  ax_msg);
3484  t_hmac(&ax_msg->ax_header,
3485  sizeof(struct GNUNET_CADET_AxHeader) + payload_size,
3486  0,
3487  &t->ax.HKs,
3488  &ax_msg->hmac);
3489 
3490  tq = GNUNET_malloc(sizeof(*tq));
3491  tq->t = t;
3492  tq->env = env;
3493  tq->cid = &ax_msg->cid; /* will initialize 'ax_msg->cid' once we know the connection */
3494  tq->cont = cont;
3495  tq->cont_cls = cont_cls;
3497  t->tq_tail,
3498  tq);
3499  if (NULL != t->send_task)
3501  t->send_task
3503  t);
3504  return tq;
3505 }
struct CadetTunnelAxolotl ax
Axolotl info.
Axolotl-encrypted tunnel message with application payload.
#define GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED
Axolotl encrypted data.
static struct GNUNET_STATISTICS_Handle * stats
Handle for statistics.
uint32_t Ns
Number of messages sent with the current ratchet key.
static void t_hmac(const void *plaintext, size_t size, uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key, struct GNUNET_ShortHashCode *hmac)
Calculate HMAC.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
uint32_t PNs
Previous message numbers (# of msgs sent under prev ratchet)
struct GNUNET_CRYPTO_EcdhePublicKey DHRs
Current ratchet key.
#define GNUNET_NO
Definition: gnunet_common.h:78
struct GNUNET_CADET_AxHeader ax_header
Axolotl-header that specifies which keys to use in which ratchet to decrypt the body that follows...
Encrypted axolotl header with numbers that identify which keys in which ratchet are to be used to dec...
static struct GNUNET_SCHEDULER_Task * t
Main task.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct CadetTunnelQueueEntry * tq_tail
Queued messages, to transmit once tunnel gets connected.
static void trigger_transmissions(void *cls)
Called when either we have a new connection, or a new message in the queue, or some existing connecti...
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct...
Definition: gnunet_mq_lib.h:52
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
struct GNUNET_CADET_ConnectionTunnelIdentifier cid
ID of the connection.
uint32_t PNs
Number of messages sent with the previous ratchet key.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:303
Struct used to save messages in a non-ready tunnel to send once connected.
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
struct CadetTunnelQueueEntry * tq_head
Queued messages, to transmit once tunnel gets connected.
Handshake completed: session key available.
struct CadetTunnel * t
Tunnel these messages belong in.
void * cont_cls
Closure for cont.
struct GNUNET_ShortHashCode hmac
MAC of the encrypted message, used to verify message integrity.
struct GNUNET_MQ_Envelope * env
Envelope of message to send follows.
struct GNUNET_CRYPTO_EcdhePrivateKey DHRs
ECDH Ratchet key (our private key in the current DH).
struct GNUNET_CRYPTO_SymmetricSessionKey HKs
32-byte header key (currently used for sending).
static void t_h_encrypt(struct CadetTunnelAxolotl *ax, struct GNUNET_CADET_TunnelEncryptedMessage *msg)
Encrypt header with the axolotl header key.
#define LOG(level,...)
struct GNUNET_SCHEDULER_Task * send_task
Task to send messages from queue (if possible).
static void t_ax_encrypt(struct CadetTunnelAxolotl *ax, void *dst, const void *src, size_t size)
Encrypt data with the axolotl tunnel key.
GCT_SendContinuation cont
Continuation to call once sent (on the channel layer).
enum CadetTunnelEState estate
State of the tunnel encryption.
#define GNUNET_malloc(size)
Wrapper around malloc.
uint32_t Ns
Message number (reset to 0 with each new ratchet, next message to send).
struct GNUNET_CADET_ConnectionTunnelIdentifier * cid
Where to put the connection identifier into the payload of the message in env once we have it...
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ GCT_send_cancel()

void GCT_send_cancel ( struct CadetTunnelQueueEntry tq)

Cancel a previously sent message while it's in the queue.

ONLY can be called before the continuation given to the send function is called. Once the continuation is called, the message is no longer in the queue!

Parameters
qHandle to the queue entry to cancel.

ONLY can be called before the continuation given to the send function is called. Once the continuation is called, the message is no longer in the queue!

Parameters
tqHandle to the queue entry to cancel.

Definition at line 3518 of file gnunet-service-cadet_tunnels.c.

References CadetTunnelQueueEntry::env, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_MQ_discard(), CadetTunnelQueueEntry::t, CadetTunnel::tq_head, and CadetTunnel::tq_tail.

Referenced by channel_destroy(), destroy_tunnel(), GCC_destroy(), handle_matching_ack(), send_channel_data_ack(), send_channel_open(), and send_open_ack().

3519 {
3520  struct CadetTunnel *t = tq->t;
3521 
3523  t->tq_tail,
3524  tq);
3525  GNUNET_MQ_discard(tq->env);
3526  GNUNET_free(tq);
3527 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static struct GNUNET_SCHEDULER_Task * t
Main task.
struct CadetTunnelQueueEntry * tq_tail
Queued messages, to transmit once tunnel gets connected.
void GNUNET_MQ_discard(struct GNUNET_MQ_Envelope *mqm)
Discard the message queue message, free all allocated resources.
Definition: mq.c:319
Struct containing all information regarding a tunnel to a peer.
struct CadetTunnelQueueEntry * tq_head
Queued messages, to transmit once tunnel gets connected.
struct CadetTunnel * t
Tunnel these messages belong in.
struct GNUNET_MQ_Envelope * env
Envelope of message to send follows.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ GCT_count_channels()

unsigned int GCT_count_channels ( struct CadetTunnel t)

Return the number of channels using a tunnel.

Parameters
ttunnel to count obtain the number of channels for
Returns
number of channels using the tunnel

Return the number of channels using a tunnel.

Parameters
tTunnel on which to count.
Returns
Number of channels.

Definition at line 588 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::channels, and GNUNET_CONTAINER_multihashmap32_size().

Referenced by connection_ready_cb(), destroy_tunnel(), GCT_destroy_tunnel_now(), GCT_remove_channel(), get_all_tunnels_iterator(), and retry_kx().

589 {
591 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
unsigned int GNUNET_CONTAINER_multihashmap32_size(const struct GNUNET_CONTAINER_MultiHashMap32 *map)
Get the number of key-value pairs in the map.
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◆ GCT_count_any_connections()

unsigned int GCT_count_any_connections ( const struct CadetTunnel t)

Return the number of connections available for a tunnel.

Parameters
ttunnel to count obtain the number of connections for
Returns
number of connections available for the tunnel

Return the number of connections available for a tunnel.

Not necessarily ready connections!

Parameters
tTunnel on which to count.
Returns
Number of connections created, either being established or ready.

Definition at line 618 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::num_busy_connections, and CadetTunnel::num_ready_connections.

Referenced by consider_path_cb(), GCT_debug(), get_all_tunnels_iterator(), and maintain_connections_cb().

619 {
621 }
unsigned int num_ready_connections
Number of connections in the connection_ready_head DLL.
unsigned int num_busy_connections
Number of connections in the connection_busy_head DLL.
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◆ GCT_iterate_connections()

void GCT_iterate_connections ( struct CadetTunnel t,
GCT_ConnectionIterator  iter,
void *  iter_cls 
)

Iterate over all connections of a tunnel.

Parameters
tTunnel whose connections to iterate.
iterIterator.
iter_clsClosure for iter.

Definition at line 3538 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::connection_busy_head, CadetTunnel::connection_ready_head, and CadetTConnection::next.

Referenced by consider_path_cb(), destroy_tunnel(), and maintain_connections_cb().

3541 {
3542  struct CadetTConnection *n;
3543 
3544  for (struct CadetTConnection *ct = t->connection_ready_head;
3545  NULL != ct;
3546  ct = n)
3547  {
3548  n = ct->next;
3549  iter(iter_cls,
3550  ct);
3551  }
3552  for (struct CadetTConnection *ct = t->connection_busy_head;
3553  NULL != ct;
3554  ct = n)
3555  {
3556  n = ct->next;
3557  iter(iter_cls,
3558  ct);
3559  }
3560 }
struct CadetTConnection * connection_ready_head
DLL of ready connections that are actively used to reach the destination peer.
struct CadetTConnection * connection_busy_head
DLL of connections that we maintain that might be used to reach the destination peer.
Entry in list of connections used by tunnel, with metadata.
struct CadetTConnection * next
Next in DLL.
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◆ GCT_iterate_channels()

void GCT_iterate_channels ( struct CadetTunnel t,
GCT_ChannelIterator  iter,
void *  iter_cls 
)

Iterate over all channels of a tunnel.

Parameters
tTunnel whose channels to iterate.
iterIterator.
iter_clsClosure for iter.

Definition at line 3609 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::channels, GNUNET_CONTAINER_multihashmap32_iterate(), ChanIterCls::iter, ChanIterCls::iter_cls, and iterate_channels_cb().

3612 {
3613  struct ChanIterCls ctx;
3614 
3615  ctx.iter = iter;
3616  ctx.iter_cls = iter_cls;
3619  &ctx);
3620 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_MulitHashMapIterator32Callback it, void *it_cls)
Iterate over all entries in the map.
void * iter_cls
Closure for iter.
static struct GNUNET_DNSSTUB_Context * ctx
Context for DNS resolution.
GCT_ChannelIterator iter
Function to call.
Closure for iterate_channels_cb.
static int iterate_channels_cb(void *cls, uint32_t key, void *value)
Helper function for GCT_iterate_channels.
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◆ GCT_get_estate()

enum CadetTunnelEState GCT_get_estate ( struct CadetTunnel t)

Get the encryption state of a tunnel.

Parameters
tTunnel.
Returns
Tunnel's encryption state.

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

References CadetTunnel::estate, and trigger_transmissions().

Referenced by get_all_tunnels_iterator(), and send_keepalive().

651 {
652  return t->estate;
653 }
enum CadetTunnelEState estate
State of the tunnel encryption.
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◆ GCT_handle_kx()

void GCT_handle_kx ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelKeyExchangeMessage msg 
)

Handle KX message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe key exchange message

Handle KX message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe key exchange message

Definition at line 1716 of file gnunet-service-cadet_tunnels.c.

References alice_or_betty(), CadetTunnel::ax, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, CadetTConnection::cc, CadetTunnel::destination, CadetTunnelAxolotl::DHRr, CadetTunnelAxolotl::DHRs, GNUNET_CADET_TunnelKeyExchangeMessage::ephemeral_key, CadetTunnel::estate, GCC_2s(), GCP_get_id(), GCT_2s(), GCT_change_estate(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_ecc_ecdh(), GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_eddsa_ecdh(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_memcmp, GNUNET_new, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_YES, CadetTunnelAxolotl::kx_0, CadetTunnel::kx_task, CadetTunnelAxolotl::last_ephemeral, LOG, GNUNET_CADET_TunnelKeyExchangeMessage::ratchet_key, ret, retry_kx(), CadetTunnelAxolotl::RK, send_kx_auth(), CadetTunnelAxolotl::skipped_head, stats, t, CadetTConnection::t, CadetTunnel::unverified_attempts, CadetTunnel::unverified_ax, and update_ax_by_kx().

Referenced by GCC_handle_kx().

1718 {
1719  struct CadetTunnel *t = ct->t;
1720  int ret;
1721 
1723  "# KX received",
1724  1,
1725  GNUNET_NO);
1726  if (GNUNET_YES ==
1728  {
1729  /* Betty/Bob is not allowed to send KX! */
1730  GNUNET_break_op(0);
1731  return;
1732  }
1734  "Received KX message from %s with ephemeral %s from %s on connection %s\n",
1735  GCT_2s(t),
1736  GNUNET_e2s(&msg->ephemeral_key),
1738  GCC_2s(ct->cc));
1739 #if 1
1740  if ((0 ==
1741  memcmp(&t->ax.DHRr,
1742  &msg->ratchet_key,
1743  sizeof(msg->ratchet_key))) &&
1744  (0 ==
1745  memcmp(&t->ax.last_ephemeral,
1746  &msg->ephemeral_key,
1747  sizeof(msg->ephemeral_key))))
1748 
1749  {
1751  "# Duplicate KX received",
1752  1,
1753  GNUNET_NO);
1754  send_kx_auth(t,
1755  ct,
1756  &t->ax,
1757  GNUNET_NO);
1758  return;
1759  }
1760 #endif
1761  /* We only keep ONE unverified KX around, so if there is an existing one,
1762  clean it up. */
1763  if (NULL != t->unverified_ax)
1764  {
1765  if ((0 ==
1766  memcmp(&t->unverified_ax->DHRr,
1767  &msg->ratchet_key,
1768  sizeof(msg->ratchet_key))) &&
1769  (0 ==
1770  memcmp(&t->unverified_ax->last_ephemeral,
1771  &msg->ephemeral_key,
1772  sizeof(msg->ephemeral_key))))
1773  {
1775  "# Duplicate unverified KX received",
1776  1,
1777  GNUNET_NO);
1778 #if 1
1779  send_kx_auth(t,
1780  ct,
1781  t->unverified_ax,
1782  GNUNET_NO);
1783  return;
1784 #endif
1785  }
1787  "Dropping old unverified KX state.\n");
1789  "# Unverified KX dropped for fresh KX",
1790  1,
1791  GNUNET_NO);
1793  memset(t->unverified_ax,
1794  0,
1795  sizeof(struct CadetTunnelAxolotl));
1796  }
1797  else
1798  {
1800  "Creating fresh unverified KX for %s\n",
1801  GCT_2s(t));
1803  "# Fresh KX setup",
1804  1,
1805  GNUNET_NO);
1807  }
1808  /* Set as the 'current' RK/DHRr the one we are currently using,
1809  so that the duplicate-detection logic of
1810  #update_ax_by_kx can work. */
1811  t->unverified_ax->RK = t->ax.RK;
1812  t->unverified_ax->DHRr = t->ax.DHRr;
1813  t->unverified_ax->DHRs = t->ax.DHRs;
1814  t->unverified_ax->kx_0 = t->ax.kx_0;
1815  t->unverified_attempts = 0;
1816 
1817  /* Update 'ax' by the new key material */
1818  ret = update_ax_by_kx(t->unverified_ax,
1819  GCP_get_id(t->destination),
1820  &msg->ephemeral_key,
1821  &msg->ratchet_key);
1822  GNUNET_break(GNUNET_SYSERR != ret);
1823  if (GNUNET_OK != ret)
1824  {
1826  "# Useless KX",
1827  1,
1828  GNUNET_NO);
1829  return; /* duplicate KX, nothing to do */
1830  }
1831  /* move ahead in our state machine */
1835  else if (CADET_TUNNEL_KEY_AX_SENT == t->estate)
1838 
1839  /* KX is still not done, try again our end. */
1840  if (CADET_TUNNEL_KEY_OK != t->estate)
1841  {
1842  if (NULL != t->kx_task)
1844  t->kx_task
1846  t);
1847  }
1848 }
struct CadetTunnelAxolotl ax
Axolotl info.
static struct GNUNET_STATISTICS_Handle * stats
Handle for statistics.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
const char * GCC_2s(const struct CadetConnection *cc)
Get a (static) string for a connection.
static int alice_or_betty(const struct GNUNET_PeerIdentity *other)
Am I Alice or Betty (some call her Bob), or talking to myself?
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
KX message sent, waiting for other peer's KX_AUTH.
static struct GNUNET_SCHEDULER_Task * t
Main task.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
static int ret
Final status code.
Definition: gnunet-arm.c:89
static int update_ax_by_kx(struct CadetTunnelAxolotl *ax, const struct GNUNET_PeerIdentity *pid, const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key, const struct GNUNET_CRYPTO_EcdhePublicKey *ratchet_key)
Update our Axolotl key state based on the KX data we received.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct GNUNET_SCHEDULER_Task * kx_task
Task to trigger KX.
struct CadetTunnel * t
Tunnel this connection belongs to.
struct CadetTunnelAxolotl * unverified_ax
Unverified Axolotl info, used only if we got a fresh KX (not a KX_AUTH) while our end of the tunnel w...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_CRYPTO_EcdhePublicKey last_ephemeral
Last ephemeral public key received from the other peer, for duplicate detection.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
unsigned int unverified_attempts
How often have we tried and failed to decrypt a message using the unverified KX material from unverif...
struct GNUNET_CRYPTO_EcdhePublicKey ratchet_key
Sender's next ephemeral public ECC key encoded in a format suitable for network transmission, as created using 'gcry_sexp_sprint'.
struct CadetConnection * cc
Connection handle.
Struct containing all information regarding a tunnel to a peer.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
Handshake completed: session key available.
void GCT_change_estate(struct CadetTunnel *t, enum CadetTunnelEState state)
Change the tunnel encryption state.
struct GNUNET_CRYPTO_SymmetricSessionKey RK
32-byte root key which gets updated by DH ratchet.
struct GNUNET_CRYPTO_EcdhePublicKey DHRr
ECDH Ratchet key (other peer's public key in the current DH).
KX message sent and received, trying to send back KX_AUTH.
struct CadetPeer * destination
Destination of the tunnel.
struct GNUNET_CRYPTO_EcdhePrivateKey DHRs
ECDH Ratchet key (our private key in the current DH).
Axolotl data, according to https://github.com/trevp/axolotl/wiki .
struct CadetTunnelSkippedKey * skipped_head
A (double linked) list of stored message keys and associated header keys for "skipped" messages...
static void send_kx_auth(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax, int force_reply)
Send a KX_AUTH message.
static void retry_kx(void *cls)
Try to redo the KX or KX_AUTH handshake, if we can.
Uninitialized status, we need to send KX.
#define LOG(level,...)
KX message received, trying to send back KX_AUTH.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key
Sender's ephemeral public ECC key encoded in a format suitable for network transmission, as created using 'gcry_sexp_sprint'.
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
enum CadetTunnelEState estate
State of the tunnel encryption.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
struct GNUNET_CRYPTO_EcdhePrivateKey kx_0
ECDH for key exchange (A0 / B0).
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ GCT_handle_kx_auth()

void GCT_handle_kx_auth ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelKeyExchangeAuthMessage msg 
)

Handle KX_AUTH message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe key exchange message

Definition at line 1925 of file gnunet-service-cadet_tunnels.c.

References GNUNET_CADET_TunnelKeyExchangeAuthMessage::auth, CadetTunnel::ax, CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, cleanup_ax(), CadetTunnel::destination, GNUNET_CADET_TunnelKeyExchangeMessage::ephemeral_key, CadetTunnel::estate, GNUNET_CADET_TunnelKeyExchangeMessage::flags, GCP_get_id(), GCT_2s(), GCT_change_estate(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CADET_KX_FLAG_FORCE_REPLY, GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_hash(), GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_memcmp, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_at(), GNUNET_STATISTICS_update(), GNUNET_CADET_TunnelKeyExchangeAuthMessage::kx, CadetTunnelAxolotl::kx_0, CadetTunnel::kx_task, LOG, my_private_key, CadetTunnel::next_kx_attempt, GNUNET_CADET_TunnelKeyExchangeMessage::ratchet_key, ret, retry_kx(), CadetTunnelAxolotl::RK, send_kx_auth(), stats, t, CadetTConnection::t, CadetTunnel::unverified_ax, and update_ax_by_kx().

Referenced by GCC_handle_kx_auth().

1927 {
1928  struct CadetTunnel *t = ct->t;
1929  struct CadetTunnelAxolotl ax_tmp;
1930  struct GNUNET_HashCode kx_auth;
1931  int ret;
1932 
1934  "# KX_AUTH received",
1935  1,
1936  GNUNET_NO);
1937  if ((CADET_TUNNEL_KEY_UNINITIALIZED == t->estate) ||
1939  {
1940  /* Confusing, we got a KX_AUTH before we even send our own
1941  KX. This should not happen. We'll send our own KX ASAP anyway,
1942  so let's ignore this here. */
1943  GNUNET_break_op(0);
1944  return;
1945  }
1947  "Handling KX_AUTH message from %s with ephemeral %s\n",
1948  GCT_2s(t),
1949  GNUNET_e2s(&msg->kx.ephemeral_key));
1950  /* We do everything in ax_tmp until we've checked the authentication
1951  so we don't clobber anything we care about by accident. */
1952  ax_tmp = t->ax;
1953 
1954  /* Update 'ax' by the new key material */
1955  ret = update_ax_by_kx(&ax_tmp,
1956  GCP_get_id(t->destination),
1957  &msg->kx.ephemeral_key,
1958  &msg->kx.ratchet_key);
1959  if (GNUNET_OK != ret)
1960  {
1961  if (GNUNET_NO == ret)
1963  "# redundant KX_AUTH received",
1964  1,
1965  GNUNET_NO);
1966  else
1967  GNUNET_break(0); /* connect to self!? */
1968  return;
1969  }
1970  GNUNET_CRYPTO_hash(&ax_tmp.RK,
1971  sizeof(ax_tmp.RK),
1972  &kx_auth);
1973  if (0 != GNUNET_memcmp(&kx_auth,
1974  &msg->auth))
1975  {
1976  /* This KX_AUTH is not using the latest KX/KX_AUTH data
1977  we transmitted to the sender, refuse it, try KX again. */
1979  "# KX_AUTH not using our last KX received (auth failure)",
1980  1,
1981  GNUNET_NO);
1983  "KX AUTH mismatch!\n");
1984 #if DEBUG_KX
1985  {
1986  struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
1987 
1989  &ephemeral_key);
1990  if (0 != GNUNET_memcmp(&ephemeral_key,
1991  &msg->r_ephemeral_key_XXX))
1992  {
1994  "My ephemeral is %s!\n",
1995  GNUNET_e2s(&ephemeral_key));
1997  "Response is for ephemeral %s!\n",
1998  GNUNET_e2s(&msg->r_ephemeral_key_XXX));
1999  }
2000  else
2001  {
2002  test_crypto_bug(&ax_tmp.kx_0,
2003  &msg->kx.ephemeral_key_XXX,
2005  &msg->kx.private_key_XXX);
2006  }
2007  }
2008 #endif
2009  if (NULL == t->kx_task)
2010  t->kx_task
2012  &retry_kx,
2013  t);
2014  return;
2015  }
2016  /* Yep, we're good. */
2017  t->ax = ax_tmp;
2018  if (NULL != t->unverified_ax)
2019  {
2020  /* We got some "stale" KX before, drop that. */
2023  t->unverified_ax = NULL;
2024  }
2025 
2026  /* move ahead in our state machine */
2027  switch (t->estate)
2028  {
2031  /* Checked above, this is impossible. */
2032  GNUNET_assert(0);
2033  break;
2034 
2035  case CADET_TUNNEL_KEY_AX_SENT: /* This is the normal case */
2036  case CADET_TUNNEL_KEY_AX_SENT_AND_RECV: /* both peers started KX */
2037  case CADET_TUNNEL_KEY_AX_AUTH_SENT: /* both peers now did KX_AUTH */
2040  break;
2041 
2042  case CADET_TUNNEL_KEY_OK:
2043  /* Did not expect another KX_AUTH, but so what, still acceptable.
2044  Nothing to do here. */
2045  break;
2046  }
2047  if (0 != (GNUNET_CADET_KX_FLAG_FORCE_REPLY & ntohl(msg->kx.flags)))
2048  {
2049  send_kx_auth(t,
2050  NULL,
2051  &t->ax,
2052  GNUNET_NO);
2053  }
2054 }
struct CadetTunnelAxolotl ax
Axolotl info.
static struct GNUNET_STATISTICS_Handle * stats
Handle for statistics.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
struct GNUNET_CADET_TunnelKeyExchangeMessage kx
Message header with key material.
uint32_t flags
Flags for the key exchange in NBO, based on enum GNUNET_CADET_KX_Flags.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH ...
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
KX message sent, waiting for other peer's KX_AUTH.
static struct GNUNET_SCHEDULER_Task * t
Main task.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
static int ret
Final status code.
Definition: gnunet-arm.c:89
static int update_ax_by_kx(struct CadetTunnelAxolotl *ax, const struct GNUNET_PeerIdentity *pid, const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral_key, const struct GNUNET_CRYPTO_EcdhePublicKey *ratchet_key)
Update our Axolotl key state based on the KX data we received.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct GNUNET_SCHEDULER_Task * kx_task
Task to trigger KX.
struct CadetTunnel * t
Tunnel this connection belongs to.
struct CadetTunnelAxolotl * unverified_ax
Unverified Axolotl info, used only if we got a fresh KX (not a KX_AUTH) while our end of the tunnel w...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
A 512-bit hashcode.
struct GNUNET_CRYPTO_EcdhePublicKey ratchet_key
Sender's next ephemeral public ECC key encoded in a format suitable for network transmission, as created using 'gcry_sexp_sprint'.
Struct containing all information regarding a tunnel to a peer.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:303
struct GNUNET_TIME_Absolute next_kx_attempt
When do we try the next KX?
Handshake completed: session key available.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Own private key.
void GCT_change_estate(struct CadetTunnel *t, enum CadetTunnelEState state)
Change the tunnel encryption state.
KX message sent and received, trying to send back KX_AUTH.
struct CadetPeer * destination
Destination of the tunnel.
The peer should reply with its KX details?
Axolotl data, according to https://github.com/trevp/axolotl/wiki .
struct GNUNET_HashCode auth
KDF-proof that sender could compute the 3-DH, used in lieu of a signature or payload data...
static void send_kx_auth(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax, int force_reply)
Send a KX_AUTH message.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
static void retry_kx(void *cls)
Try to redo the KX or KX_AUTH handshake, if we can.
static void cleanup_ax(struct CadetTunnelAxolotl *ax)
Cleanup state used by ax.
Uninitialized status, we need to send KX.
#define LOG(level,...)
KX message received, trying to send back KX_AUTH.
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key
Sender's ephemeral public ECC key encoded in a format suitable for network transmission, as created using 'gcry_sexp_sprint'.
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
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:1214
enum CadetTunnelEState estate
State of the tunnel encryption.
#define GNUNET_free(ptr)
Wrapper around free.
const struct GNUNET_PeerIdentity * GCP_get_id(struct CadetPeer *cp)
Obtain the peer identity for a struct CadetPeer.
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◆ GCT_handle_encrypted()

void GCT_handle_encrypted ( struct CadetTConnection ct,
const struct GNUNET_CADET_TunnelEncryptedMessage msg 
)

Handle encrypted message.

Parameters
ctconnection/tunnel combo that received encrypted message
msgthe encrypted message to decrypt

Definition at line 3258 of file gnunet-service-cadet_tunnels.c.

References CadetTunnel::ax, CADET_TUNNEL_KEY_AX_AUTH_SENT, CADET_TUNNEL_KEY_AX_RECV, CADET_TUNNEL_KEY_AX_SENT, CADET_TUNNEL_KEY_AX_SENT_AND_RECV, CADET_TUNNEL_KEY_OK, CADET_TUNNEL_KEY_UNINITIALIZED, cleanup_ax(), CadetTunnel::current_ct, CadetTunnel::estate, GCT_2s(), GCT_change_estate(), GNUNET_ALIGN, GNUNET_break_op, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_MST_from_buffer(), GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_update(), GNUNET_YES, GNUNET_CADET_TunnelEncryptedMessage::header, CadetTunnel::kx_task, LOG, MAX_UNVERIFIED_ATTEMPTS, CadetTunnel::mst, send_kx(), send_kx_auth(), CadetTunnel::send_task, size, GNUNET_MessageHeader::size, stats, CadetTConnection::t, t_ax_decrypt_and_validate(), trigger_transmissions(), CadetTunnel::unverified_attempts, and CadetTunnel::unverified_ax.

Referenced by GCC_handle_encrypted().

3260 {
3261  struct CadetTunnel *t = ct->t;
3262  uint16_t size = ntohs(msg->header.size);
3263  char cbuf [size] GNUNET_ALIGN;
3264  ssize_t decrypted_size;
3265 
3267  "%s received %u bytes of encrypted data in state %d\n",
3268  GCT_2s(t),
3269  (unsigned int)size,
3270  t->estate);
3271 
3272  switch (t->estate)
3273  {
3276  /* We did not even SEND our KX, how can the other peer
3277  send us encrypted data? Must have been that we went
3278  down and the other peer still things we are up.
3279  Let's send it KX back. */
3281  "# received encrypted without any KX",
3282  1,
3283  GNUNET_NO);
3284  if (NULL != t->kx_task)
3285  {
3287  t->kx_task = NULL;
3288  }
3289  send_kx(t,
3290  ct,
3291  &t->ax);
3292  return;
3293 
3295  /* We send KX, and other peer send KX to us at the same time.
3296  Neither KX is AUTH'ed, so let's try KX_AUTH this time. */
3298  "# received encrypted without KX_AUTH",
3299  1,
3300  GNUNET_NO);
3301  if (NULL != t->kx_task)
3302  {
3304  t->kx_task = NULL;
3305  }
3306  send_kx_auth(t,
3307  ct,
3308  &t->ax,
3309  GNUNET_YES);
3310  return;
3311 
3313  /* We did not get the KX of the other peer, but that
3314  might have been lost. Send our KX again immediately. */
3316  "# received encrypted without KX",
3317  1,
3318  GNUNET_NO);
3319  if (NULL != t->kx_task)
3320  {
3322  t->kx_task = NULL;
3323  }
3324  send_kx(t,
3325  ct,
3326  &t->ax);
3327  return;
3328 
3330  /* Great, first payload, we might graduate to OK! */
3331  case CADET_TUNNEL_KEY_OK:
3332  /* We are up and running, all good. */
3333  break;
3334  }
3335 
3336  decrypted_size = -1;
3337  if (CADET_TUNNEL_KEY_OK == t->estate)
3338  {
3339  /* We have well-established key material available,
3340  try that. (This is the common case.) */
3341  decrypted_size = t_ax_decrypt_and_validate(&t->ax,
3342  cbuf,
3343  msg,
3344  size);
3345  }
3346 
3347  if ((-1 == decrypted_size) &&
3348  (NULL != t->unverified_ax))
3349  {
3350  /* We have un-authenticated KX material available. We should try
3351  this as a back-up option, in case the sender crashed and
3352  switched keys. */
3353  decrypted_size = t_ax_decrypt_and_validate(t->unverified_ax,
3354  cbuf,
3355  msg,
3356  size);
3357  if (-1 != decrypted_size)
3358  {
3359  /* It worked! Treat this as authentication of the AX data! */
3360  cleanup_ax(&t->ax);
3361  t->ax = *t->unverified_ax;
3363  t->unverified_ax = NULL;
3364  }
3366  {
3367  /* First time it worked, move tunnel into production! */
3370  if (NULL != t->send_task)
3373  t);
3374  }
3375  }
3376  if (NULL != t->unverified_ax)
3377  {
3378  /* We had unverified KX material that was useless; so increment
3379  counter and eventually move to ignore it. Note that we even do
3380  this increment if we successfully decrypted with the old KX
3381  material and thus didn't even both with the new one. This is
3382  the ideal case, as a malicious injection of bogus KX data
3383  basically only causes us to increment a counter a few times. */
3384  t->unverified_attempts++;
3386  "Failed to decrypt message with unverified KX data %u times\n",
3387  t->unverified_attempts);
3389  {
3392  t->unverified_ax = NULL;
3393  }
3394  }
3395 
3396  if (-1 == decrypted_size)
3397  {
3398  /* Decryption failed for good, complain. */
3400  "%s failed to decrypt and validate encrypted data, retrying KX\n",
3401  GCT_2s(t));
3403  "# unable to decrypt",
3404  1,
3405  GNUNET_NO);
3406  if (NULL != t->kx_task)
3407  {
3409  t->kx_task = NULL;
3410  }
3411  send_kx(t,
3412  ct,
3413  &t->ax);
3414  return;
3415  }
3417  "# decrypted bytes",
3418  decrypted_size,
3419  GNUNET_NO);
3420 
3421  /* The MST will ultimately call #handle_decrypted() on each message. */
3422  t->current_ct = ct;
3425  cbuf,
3426  decrypted_size,
3427  GNUNET_YES,
3428  GNUNET_NO));
3429  t->current_ct = NULL;
3430 }
struct CadetTunnelAxolotl ax
Axolotl info.
static struct GNUNET_STATISTICS_Handle * stats
Handle for statistics.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
KX received and we sent KX_AUTH back, but we got no traffic yet, so we're waiting for either KX_AUTH ...
static void send_kx(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax)
Send a KX message.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
KX message sent, waiting for other peer's KX_AUTH.
static struct GNUNET_SCHEDULER_Task * t
Main task.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
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_SCHEDULER_Task * kx_task
Task to trigger KX.
struct CadetTunnel * t
Tunnel this connection belongs to.
static void trigger_transmissions(void *cls)
Called when either we have a new connection, or a new message in the queue, or some existing connecti...
static ssize_t t_ax_decrypt_and_validate(struct CadetTunnelAxolotl *ax, void *dst, const struct GNUNET_CADET_TunnelEncryptedMessage *src, size_t size)
Decrypt and verify data with the appropriate tunnel key and verify that the data has not been altered...
struct CadetTunnelAxolotl * unverified_ax
Unverified Axolotl info, used only if we got a fresh KX (not a KX_AUTH) while our end of the tunnel w...
struct CadetTConnection * current_ct
Identification of the connection from which we are currently processing a message.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
unsigned int unverified_attempts
How often have we tried and failed to decrypt a message using the unverified KX material from unverif...
struct GNUNET_MessageStreamTokenizer * mst
Tokenizer for decrypted messages.
int GNUNET_MST_from_buffer(struct GNUNET_MessageStreamTokenizer *mst, const char *buf, size_t size, int purge, int one_shot)
Add incoming data to the receive buffer and call the callback for all complete messages.
Definition: mst.c:113
Struct containing all information regarding a tunnel to a peer.
static unsigned int size
Size of the "table".
Definition: peer.c:66
Handshake completed: session key available.
void GCT_change_estate(struct CadetTunnel *t, enum CadetTunnelEState state)
Change the tunnel encryption state.
KX message sent and received, trying to send back KX_AUTH.
#define GNUNET_ALIGN
gcc-ism to force alignment; we use this to align char-arrays that may then be cast to 'struct's...
#define MAX_UNVERIFIED_ATTEMPTS
How often do we try to decrypt payload with unverified key material? Used to limit CPU increase upon ...
static void send_kx_auth(struct CadetTunnel *t, struct CadetTConnection *ct, struct CadetTunnelAxolotl *ax, int force_reply)
Send a KX_AUTH message.
static void cleanup_ax(struct CadetTunnelAxolotl *ax)
Cleanup state used by ax.
Uninitialized status, we need to send KX.
#define LOG(level,...)
KX message received, trying to send back KX_AUTH.
struct GNUNET_SCHEDULER_Task * send_task
Task to send messages from queue (if possible).
#define GNUNET_YES
Definition: gnunet_common.h:77
enum CadetTunnelEState estate
State of the tunnel encryption.
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ GCT_debug()

void GCT_debug ( const struct CadetTunnel t,
enum GNUNET_ErrorType  level 
)

Log all possible info about the tunnel state.

Parameters
tTunnel to debug.
levelDebug level to use.

Definition at line 3654 of file gnunet-service-cadet_tunnels.c.

References CadetTConnection::cc, CadetTunnel::channels, CadetTunnel::connection_busy_head, CadetTunnel::connection_ready_head, debug_channel(), CadetTunnel::estate, estate2s(), GCC_debug(), GCT_2s(), GCT_count_any_connections(), GNUNET_CONTAINER_multihashmap32_iterate(), GNUNET_ERROR_TYPE_BULK, GNUNET_get_log_call_status(), LOG2, CadetTConnection::next, and CadetTunnel::tq_len.

3656 {
3657 #if !defined(GNUNET_CULL_LOGGING)
3658  struct CadetTConnection *iter_c;
3659  int do_log;
3660 
3662  "cadet-tun",
3663  __FILE__, __FUNCTION__, __LINE__);
3664  if (0 == do_log)
3665  return;
3666 
3667  LOG2(level,
3668  "TTT TUNNEL TOWARDS %s in estate %s tq_len: %u #cons: %u\n",
3669  GCT_2s(t),
3670  estate2s(t->estate),
3671  t->tq_len,
3673  LOG2(level,
3674  "TTT channels:\n");
3676  &debug_channel,
3677  &level);
3678  LOG2(level,
3679  "TTT connections:\n");
3680  for (iter_c = t->connection_ready_head; NULL != iter_c; iter_c = iter_c->next)
3681  GCC_debug(iter_c->cc,
3682  level);
3683  for (iter_c = t->connection_busy_head; NULL != iter_c; iter_c = iter_c->next)
3684  GCC_debug(iter_c->cc,
3685  level);
3686 
3687  LOG2(level,
3688  "TTT TUNNEL END\n");
3689 #endif
3690 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
static const char * estate2s(enum CadetTunnelEState es)
Get string description for tunnel encryption state.
const char * GCT_2s(const struct CadetTunnel *t)
Get the static string for the peer this tunnel is directed.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_MulitHashMapIterator32Callback it, void *it_cls)
Iterate over all entries in the map.
unsigned int GCT_count_any_connections(const struct CadetTunnel *t)
Count all created connections of a tunnel.
struct CadetTConnection * connection_ready_head
DLL of ready connections that are actively used to reach the destination peer.
void GCC_debug(struct CadetConnection *cc, enum GNUNET_ErrorType level)
Log connection info.
struct CadetTConnection * connection_busy_head
DLL of connections that we maintain that might be used to reach the destination peer.
struct CadetConnection * cc
Connection handle.
#define LOG2(level,...)
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.
Entry in list of connections used by tunnel, with metadata.
static int debug_channel(void *cls, uint32_t key, void *value)
Call GCCH_debug() on a channel.
struct CadetTConnection * next
Next in DLL.
unsigned int tq_len
Number of entries in the tq_head DLL.
enum CadetTunnelEState estate
State of the tunnel encryption.
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