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, enum GNUNET_CADET_ChannelOption options, 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 213 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 274 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 298 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.

45 {
51 
56 
61 
66 
77 
82 
83 };
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 517 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().

518 {
519  static char buf[64];
520 
521  if (NULL == t)
522  return "Tunnel(NULL)";
523  GNUNET_snprintf (buf,
524  sizeof (buf),
525  "Tunnel %s",
527  return buf;
528 }
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 3141 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().

3142 {
3143  struct CadetTunnel *t = GNUNET_new (struct CadetTunnel);
3144  struct GNUNET_MQ_MessageHandler handlers[] = {
3145  GNUNET_MQ_hd_fixed_size (plaintext_keepalive,
3147  struct GNUNET_MessageHeader,
3148  t),
3149  GNUNET_MQ_hd_var_size (plaintext_data,
3152  t),
3153  GNUNET_MQ_hd_fixed_size (plaintext_data_ack,
3156  t),
3157  GNUNET_MQ_hd_fixed_size (plaintext_channel_open,
3160  t),
3161  GNUNET_MQ_hd_fixed_size (plaintext_channel_open_ack,
3164  t),
3165  GNUNET_MQ_hd_fixed_size (plaintext_channel_destroy,
3168  t),
3170  };
3171 
3173  new_ephemeral (&t->ax);
3176  t->destination = destination;
3180  t);
3181  t->mq = GNUNET_MQ_queue_for_callbacks (NULL,
3182  NULL,
3183  NULL,
3184  NULL,
3185  handlers,
3187  t);
3189  t);
3190  return t;
3191 }
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:78
#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:552
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:1273
#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:87
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 2316 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().

2317 {
2321  t);
2322  GNUNET_assert (0 ==
2323  GCT_count_channels (t));
2324  if (NULL != t->destroy_task)
2325  {
2327  t->destroy_task = NULL;
2328  }
2329  destroy_tunnel (t);
2330 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
#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 GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_HashMapIterator32 it, void *it_cls)
Iterate over all entries in the map.
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:80
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:965
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◆ GCT_add_inbound_connection()

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

Add a connection to the tunnel.

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 3205 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().

3209 {
3210  struct CadetTConnection *ct;
3211 
3212  ct = GNUNET_new (struct CadetTConnection);
3214  ct->t = t;
3215  ct->cc = GCC_create_inbound (t->destination,
3216  path,
3217  options,
3218  ct,
3219  cid,
3221  ct);
3222  if (NULL == ct->cc)
3223  {
3225  "%s refused inbound %s (duplicate)\n",
3226  GCT_2s (t),
3227  GCC_2s (ct->cc));
3228  GNUNET_free (ct);
3229  return GNUNET_SYSERR;
3230  }
3231  /* FIXME: schedule job to kill connection (and path?) if it takes
3232  too long to get ready! (And track performance data on how long
3233  other connections took with the tunnel!)
3234  => Note: to be done within 'connection'-logic! */
3237  ct);
3238  t->num_busy_connections++;
3240  "%s has new %s\n",
3241  GCT_2s (t),
3242  GCC_2s (ct->cc));
3243  return GNUNET_OK;
3244 }
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
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:78
#define GNUNET_new(type)
Allocate a struct or union of the given type.
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 CadetConnection * GCC_create_inbound(struct CadetPeer *destination, struct CadetPeerPath *path, enum GNUNET_CADET_ChannelOption options, 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 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:79
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 2157 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().

2158 {
2159  struct CadetTunnel *t = ct->t;
2160 
2161  if (GNUNET_YES == ct->is_ready)
2162  {
2165  ct);
2166  t->num_ready_connections--;
2167  }
2168  else
2169  {
2172  ct);
2173  t->num_busy_connections--;
2174  }
2175  GNUNET_free (ct);
2176 }
#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:80
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 2829 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().

2832 {
2834  "Considering %s for %s (offset %u)\n",
2835  GCPP_2s (p),
2836  GCT_2s (t),
2837  off);
2838  (void) consider_path_cb (t,
2839  p,
2840  off);
2841 }
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 2102 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().

2104 {
2106 
2107  ctn = get_next_free_ctn (t);
2108  if (NULL != t->destroy_task)
2109  {
2111  t->destroy_task = NULL;
2112  }
2115  ntohl (ctn.cn),
2116  ch,
2119  "Adding %s to %s\n",
2120  GCCH_2s (ch),
2121  GCT_2s (t));
2122  switch (t->estate)
2123  {
2125  /* waiting for connection to start KX */
2126  break;
2130  /* we're currently waiting for KX to complete */
2131  break;
2133  /* waiting for OTHER peer to send us data,
2134  we might need to prompt more aggressively! */
2135  if (NULL == t->kx_task)
2136  t->kx_task
2138  &retry_kx,
2139  t);
2140  break;
2141  case CADET_TUNNEL_KEY_OK:
2142  /* We are ready. Tell the new channel that we are up. */
2143  GCCH_tunnel_up (ch);
2144  break;
2145  }
2146  return ctn;
2147 }
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:80
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:1223
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:965
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 2265 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().

2268 {
2270  "Removing %s from %s\n",
2271  GCCH_2s (ch),
2272  GCT_2s (t));
2275  ntohl (ctn.cn),
2276  ch));
2277  if ( (0 ==
2278  GCT_count_channels (t)) &&
2279  (NULL == t->destroy_task) )
2280  {
2281  t->destroy_task
2283  &destroy_tunnel,
2284  t);
2285  }
2286 }
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:1246
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:80
#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 3004 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().

3006 {
3008 
3010  "Sending DESTORY message for channel ID %u\n",
3011  ntohl (ctn.cn));
3012  msg.header.size = htons (sizeof (msg));
3014  msg.reserved = htonl (0);
3015  msg.ctn = ctn;
3016  GCT_send (t,
3017  &msg.header,
3018  NULL,
3019  NULL);
3020 }
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 3437 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().

3441 {
3442  struct CadetTunnelQueueEntry *tq;
3443  uint16_t payload_size;
3444  struct GNUNET_MQ_Envelope *env;
3445  struct GNUNET_CADET_TunnelEncryptedMessage *ax_msg;
3446 
3447  if (CADET_TUNNEL_KEY_OK != t->estate)
3448  {
3449  GNUNET_break (0);
3450  return NULL;
3451  }
3452  payload_size = ntohs (message->size);
3454  "Encrypting %u bytes for %s\n",
3455  (unsigned int) payload_size,
3456  GCT_2s (t));
3457  env = GNUNET_MQ_msg_extra (ax_msg,
3458  payload_size,
3460  t_ax_encrypt (&t->ax,
3461  &ax_msg[1],
3462  message,
3463  payload_size);
3465  "# encrypted bytes",
3466  payload_size,
3467  GNUNET_NO);
3468  ax_msg->ax_header.Ns = htonl (t->ax.Ns++);
3469  ax_msg->ax_header.PNs = htonl (t->ax.PNs);
3470  /* FIXME: we should do this once, not once per message;
3471  this is a point multiplication, and DHRs does not
3472  change all the time. */
3474  &ax_msg->ax_header.DHRs);
3475  t_h_encrypt (&t->ax,
3476  ax_msg);
3477  t_hmac (&ax_msg->ax_header,
3478  sizeof (struct GNUNET_CADET_AxHeader) + payload_size,
3479  0,
3480  &t->ax.HKs,
3481  &ax_msg->hmac);
3482 
3483  tq = GNUNET_malloc (sizeof (*tq));
3484  tq->t = t;
3485  tq->env = env;
3486  tq->cid = &ax_msg->cid; /* will initialize 'ax_msg->cid' once we know the connection */
3487  tq->cont = cont;
3488  tq->cont_cls = cont_cls;
3490  t->tq_tail,
3491  tq);
3492  if (NULL != t->send_task)
3494  t->send_task
3496  t);
3497  return tq;
3498 }
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:81
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:1273
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:965
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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 3511 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().

3512 {
3513  struct CadetTunnel *t = tq->t;
3514 
3516  t->tq_tail,
3517  tq);
3518  GNUNET_MQ_discard (tq->env);
3519  GNUNET_free (tq);
3520 }
#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:321
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 3531 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().

3534 {
3535  struct CadetTConnection *n;
3536  for (struct CadetTConnection *ct = t->connection_ready_head;
3537  NULL != ct;
3538  ct = n)
3539  {
3540  n = ct->next;
3541  iter (iter_cls,
3542  ct);
3543  }
3544  for (struct CadetTConnection *ct = t->connection_busy_head;
3545  NULL != ct;
3546  ct = n)
3547  {
3548  n = ct->next;
3549  iter (iter_cls,
3550  ct);
3551  }
3552 }
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 3602 of file gnunet-service-cadet_tunnels.c.

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

3605 {
3606  struct ChanIterCls ctx;
3607 
3608  ctx.iter = iter;
3609  ctx.iter_cls = iter_cls;
3612  &ctx);
3613 
3614 }
struct GNUNET_CONTAINER_MultiHashMap32 * channels
Channels inside this tunnel.
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.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_HashMapIterator32 it, void *it_cls)
Iterate over all entries in the map.
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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 1713 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().

1715 {
1716  struct CadetTunnel *t = ct->t;
1717  int ret;
1718 
1720  "# KX received",
1721  1,
1722  GNUNET_NO);
1723  if (GNUNET_YES ==
1725  {
1726  /* Betty/Bob is not allowed to send KX! */
1727  GNUNET_break_op (0);
1728  return;
1729  }
1731  "Received KX message from %s with ephemeral %s from %s on connection %s\n",
1732  GCT_2s (t),
1733  GNUNET_e2s (&msg->ephemeral_key),
1735  GCC_2s (ct->cc));
1736 #if 1
1737  if ( (0 ==
1738  memcmp (&t->ax.DHRr,
1739  &msg->ratchet_key,
1740  sizeof (msg->ratchet_key))) &&
1741  (0 ==
1742  memcmp (&t->ax.last_ephemeral,
1743  &msg->ephemeral_key,
1744  sizeof (msg->ephemeral_key))) )
1745 
1746  {
1748  "# Duplicate KX received",
1749  1,
1750  GNUNET_NO);
1751  send_kx_auth (t,
1752  ct,
1753  &t->ax,
1754  GNUNET_NO);
1755  return;
1756  }
1757 #endif
1758  /* We only keep ONE unverified KX around, so if there is an existing one,
1759  clean it up. */
1760  if (NULL != t->unverified_ax)
1761  {
1762  if ( (0 ==
1763  memcmp (&t->unverified_ax->DHRr,
1764  &msg->ratchet_key,
1765  sizeof (msg->ratchet_key))) &&
1766  (0 ==
1767  memcmp (&t->unverified_ax->last_ephemeral,
1768  &msg->ephemeral_key,
1769  sizeof (msg->ephemeral_key))) )
1770  {
1772  "# Duplicate unverified KX received",
1773  1,
1774  GNUNET_NO);
1775 #if 1
1776  send_kx_auth (t,
1777  ct,
1778  t->unverified_ax,
1779  GNUNET_NO);
1780  return;
1781 #endif
1782  }
1784  "Dropping old unverified KX state.\n");
1786  "# Unverified KX dropped for fresh KX",
1787  1,
1788  GNUNET_NO);
1789  GNUNET_break (NULL == t->unverified_ax->skipped_head);
1790  memset (t->unverified_ax,
1791  0,
1792  sizeof (struct CadetTunnelAxolotl));
1793  }
1794  else
1795  {
1797  "Creating fresh unverified KX for %s\n",
1798  GCT_2s (t));
1800  "# Fresh KX setup",
1801  1,
1802  GNUNET_NO);
1804  }
1805  /* Set as the 'current' RK/DHRr the one we are currently using,
1806  so that the duplicate-detection logic of
1807  #update_ax_by_kx can work. */
1808  t->unverified_ax->RK = t->ax.RK;
1809  t->unverified_ax->DHRr = t->ax.DHRr;
1810  t->unverified_ax->DHRs = t->ax.DHRs;
1811  t->unverified_ax->kx_0 = t->ax.kx_0;
1812  t->unverified_attempts = 0;
1813 
1814  /* Update 'ax' by the new key material */
1815  ret = update_ax_by_kx (t->unverified_ax,
1816  GCP_get_id (t->destination),
1817  &msg->ephemeral_key,
1818  &msg->ratchet_key);
1819  GNUNET_break (GNUNET_SYSERR != ret);
1820  if (GNUNET_OK != ret)
1821  {
1823  "# Useless KX",
1824  1,
1825  GNUNET_NO);
1826  return; /* duplicate KX, nothing to do */
1827  }
1828  /* move ahead in our state machine */
1830  GCT_change_estate (t,
1832  else if (CADET_TUNNEL_KEY_AX_SENT == t->estate)
1833  GCT_change_estate (t,
1835 
1836  /* KX is still not done, try again our end. */
1837  if (CADET_TUNNEL_KEY_OK != t->estate)
1838  {
1839  if (NULL != t->kx_task)
1841  t->kx_task
1843  t);
1844  }
1845 }
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:81
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
#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:1273
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:79
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:80
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:965
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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 1922 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().

1924 {
1925  struct CadetTunnel *t = ct->t;
1926  struct CadetTunnelAxolotl ax_tmp;
1927  struct GNUNET_HashCode kx_auth;
1928  int ret;
1929 
1931  "# KX_AUTH received",
1932  1,
1933  GNUNET_NO);
1934  if ( (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate) ||
1936  {
1937  /* Confusing, we got a KX_AUTH before we even send our own
1938  KX. This should not happen. We'll send our own KX ASAP anyway,
1939  so let's ignore this here. */
1940  GNUNET_break_op (0);
1941  return;
1942  }
1944  "Handling KX_AUTH message from %s with ephemeral %s\n",
1945  GCT_2s (t),
1946  GNUNET_e2s (&msg->kx.ephemeral_key));
1947  /* We do everything in ax_tmp until we've checked the authentication
1948  so we don't clobber anything we care about by accident. */
1949  ax_tmp = t->ax;
1950 
1951  /* Update 'ax' by the new key material */
1952  ret = update_ax_by_kx (&ax_tmp,
1953  GCP_get_id (t->destination),
1954  &msg->kx.ephemeral_key,
1955  &msg->kx.ratchet_key);
1956  if (GNUNET_OK != ret)
1957  {
1958  if (GNUNET_NO == ret)
1960  "# redundant KX_AUTH received",
1961  1,
1962  GNUNET_NO);
1963  else
1964  GNUNET_break (0); /* connect to self!? */
1965  return;
1966  }
1967  GNUNET_CRYPTO_hash (&ax_tmp.RK,
1968  sizeof (ax_tmp.RK),
1969  &kx_auth);
1970  if (0 != GNUNET_memcmp (&kx_auth,
1971  &msg->auth))
1972  {
1973  /* This KX_AUTH is not using the latest KX/KX_AUTH data
1974  we transmitted to the sender, refuse it, try KX again. */
1976  "# KX_AUTH not using our last KX received (auth failure)",
1977  1,
1978  GNUNET_NO);
1980  "KX AUTH mismatch!\n");
1981 #if DEBUG_KX
1982  {
1983  struct GNUNET_CRYPTO_EcdhePublicKey ephemeral_key;
1984 
1985  GNUNET_CRYPTO_ecdhe_key_get_public (&ax_tmp.kx_0,
1986  &ephemeral_key);
1987  if (0 != GNUNET_memcmp (&ephemeral_key,
1988  &msg->r_ephemeral_key_XXX))
1989  {
1991  "My ephemeral is %s!\n",
1992  GNUNET_e2s (&ephemeral_key));
1994  "Response is for ephemeral %s!\n",
1995  GNUNET_e2s (&msg->r_ephemeral_key_XXX));
1996  }
1997  else
1998  {
1999  test_crypto_bug (&ax_tmp.kx_0,
2000  &msg->kx.ephemeral_key_XXX,
2002  &msg->kx.private_key_XXX);
2003  }
2004  }
2005 #endif
2006  if (NULL == t->kx_task)
2007  t->kx_task
2009  &retry_kx,
2010  t);
2011  return;
2012  }
2013  /* Yep, we're good. */
2014  t->ax = ax_tmp;
2015  if (NULL != t->unverified_ax)
2016  {
2017  /* We got some "stale" KX before, drop that. */
2020  t->unverified_ax = NULL;
2021  }
2022 
2023  /* move ahead in our state machine */
2024  switch (t->estate)
2025  {
2028  /* Checked above, this is impossible. */
2029  GNUNET_assert (0);
2030  break;
2031  case CADET_TUNNEL_KEY_AX_SENT: /* This is the normal case */
2032  case CADET_TUNNEL_KEY_AX_SENT_AND_RECV: /* both peers started KX */
2033  case CADET_TUNNEL_KEY_AX_AUTH_SENT: /* both peers now did KX_AUTH */
2034  GCT_change_estate (t,
2036  break;
2037  case CADET_TUNNEL_KEY_OK:
2038  /* Did not expect another KX_AUTH, but so what, still acceptable.
2039  Nothing to do here. */
2040  break;
2041  }
2042  if (0 != (GNUNET_CADET_KX_FLAG_FORCE_REPLY & ntohl (msg->kx.flags)))
2043  {
2044  send_kx_auth (t,
2045  NULL,
2046  &t->ax,
2047  GNUNET_NO);
2048  }
2049 }
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:81
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
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:1223
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 3254 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().

3256 {
3257  struct CadetTunnel *t = ct->t;
3258  uint16_t size = ntohs (msg->header.size);
3259  char cbuf [size] GNUNET_ALIGN;
3260  ssize_t decrypted_size;
3261 
3263  "%s received %u bytes of encrypted data in state %d\n",
3264  GCT_2s (t),
3265  (unsigned int) size,
3266  t->estate);
3267 
3268  switch (t->estate)
3269  {
3272  /* We did not even SEND our KX, how can the other peer
3273  send us encrypted data? Must have been that we went
3274  down and the other peer still things we are up.
3275  Let's send it KX back. */
3277  "# received encrypted without any KX",
3278  1,
3279  GNUNET_NO);
3280  if (NULL != t->kx_task)
3281  {
3283  t->kx_task = NULL;
3284  }
3285  send_kx (t,
3286  ct,
3287  &t->ax);
3288  return;
3290  /* We send KX, and other peer send KX to us at the same time.
3291  Neither KX is AUTH'ed, so let's try KX_AUTH this time. */
3293  "# received encrypted without KX_AUTH",
3294  1,
3295  GNUNET_NO);
3296  if (NULL != t->kx_task)
3297  {
3299  t->kx_task = NULL;
3300  }
3301  send_kx_auth (t,
3302  ct,
3303  &t->ax,
3304  GNUNET_YES);
3305  return;
3307  /* We did not get the KX of the other peer, but that
3308  might have been lost. Send our KX again immediately. */
3310  "# received encrypted without KX",
3311  1,
3312  GNUNET_NO);
3313  if (NULL != t->kx_task)
3314  {
3316  t->kx_task = NULL;
3317  }
3318  send_kx (t,
3319  ct,
3320  &t->ax);
3321  return;
3323  /* Great, first payload, we might graduate to OK! */
3324  case CADET_TUNNEL_KEY_OK:
3325  /* We are up and running, all good. */
3326  break;
3327  }
3328 
3329  decrypted_size = -1;
3330  if (CADET_TUNNEL_KEY_OK == t->estate)
3331  {
3332  /* We have well-established key material available,
3333  try that. (This is the common case.) */
3334  decrypted_size = t_ax_decrypt_and_validate (&t->ax,
3335  cbuf,
3336  msg,
3337  size);
3338  }
3339 
3340  if ( (-1 == decrypted_size) &&
3341  (NULL != t->unverified_ax) )
3342  {
3343  /* We have un-authenticated KX material available. We should try
3344  this as a back-up option, in case the sender crashed and
3345  switched keys. */
3346  decrypted_size = t_ax_decrypt_and_validate (t->unverified_ax,
3347  cbuf,
3348  msg,
3349  size);
3350  if (-1 != decrypted_size)
3351  {
3352  /* It worked! Treat this as authentication of the AX data! */
3353  cleanup_ax (&t->ax);
3354  t->ax = *t->unverified_ax;
3356  t->unverified_ax = NULL;
3357  }
3359  {
3360  /* First time it worked, move tunnel into production! */
3361  GCT_change_estate (t,
3363  if (NULL != t->send_task)
3366  t);
3367  }
3368  }
3369  if (NULL != t->unverified_ax)
3370  {
3371  /* We had unverified KX material that was useless; so increment
3372  counter and eventually move to ignore it. Note that we even do
3373  this increment if we successfully decrypted with the old KX
3374  material and thus didn't even both with the new one. This is
3375  the ideal case, as a malicious injection of bogus KX data
3376  basically only causes us to increment a counter a few times. */
3377  t->unverified_attempts++;
3379  "Failed to decrypt message with unverified KX data %u times\n",
3380  t->unverified_attempts);
3382  {
3385  t->unverified_ax = NULL;
3386  }
3387  }
3388 
3389  if (-1 == decrypted_size)
3390  {
3391  /* Decryption failed for good, complain. */
3393  "%s failed to decrypt and validate encrypted data, retrying KX\n",
3394  GCT_2s (t));
3396  "# unable to decrypt",
3397  1,
3398  GNUNET_NO);
3399  if (NULL != t->kx_task)
3400  {
3402  t->kx_task = NULL;
3403  }
3404  send_kx (t,
3405  ct,
3406  &t->ax);
3407  return;
3408  }
3410  "# decrypted bytes",
3411  decrypted_size,
3412  GNUNET_NO);
3413 
3414  /* The MST will ultimately call #handle_decrypted() on each message. */
3415  t->current_ct = ct;
3418  cbuf,
3419  decrypted_size,
3420  GNUNET_YES,
3421  GNUNET_NO));
3422  t->current_ct = NULL;
3423 }
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:81
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:78
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:1273
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:116
Struct containing all information regarding a tunnel to a peer.
static unsigned int size
Size of the "table".
Definition: peer.c:67
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:80
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:965
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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 3648 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.

3650 {
3651 #if !defined(GNUNET_CULL_LOGGING)
3652  struct CadetTConnection *iter_c;
3653  int do_log;
3654 
3656  "cadet-tun",
3657  __FILE__, __FUNCTION__, __LINE__);
3658  if (0 == do_log)
3659  return;
3660 
3661  LOG2 (level,
3662  "TTT TUNNEL TOWARDS %s in estate %s tq_len: %u #cons: %u\n",
3663  GCT_2s (t),
3664  estate2s (t->estate),
3665  t->tq_len,
3667  LOG2 (level,
3668  "TTT channels:\n");
3670  &debug_channel,
3671  &level);
3672  LOG2 (level,
3673  "TTT connections:\n");
3674  for (iter_c = t->connection_ready_head; NULL != iter_c; iter_c = iter_c->next)
3675  GCC_debug (iter_c->cc,
3676  level);
3677  for (iter_c = t->connection_busy_head; NULL != iter_c; iter_c = iter_c->next)
3678  GCC_debug (iter_c->cc,
3679  level);
3680 
3681  LOG2 (level,
3682  "TTT TUNNEL END\n");
3683 #endif
3684 }
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.
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.
int GNUNET_CONTAINER_multihashmap32_iterate(struct GNUNET_CONTAINER_MultiHashMap32 *map, GNUNET_CONTAINER_HashMapIterator32 it, void *it_cls)
Iterate over all entries in the map.
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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