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

GNUnet MESSENGER service. More...

#include "platform.h"
#include "gnunet_cadet_service.h"
#include "gnunet_peer_lib.h"
#include "gnunet_crypto_lib.h"
#include "gnunet-service-messenger_room.h"
#include "gnunet-service-messenger_message_state.h"
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Data Structures

struct  GNUNET_MESSENGER_SrvTunnel
 

Functions

struct GNUNET_MESSENGER_SrvTunnelcreate_tunnel (struct GNUNET_MESSENGER_SrvRoom *room, const struct GNUNET_PeerIdentity *door)
 Creates and allocates a tunnel of a room to a specific peer identity (called door). More...
 
void destroy_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Destroys a tunnel and frees its memory fully. More...
 
void bind_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel, struct GNUNET_CADET_Channel *channel)
 Binds a CADET channel to a tunnel and replaces its channel the tunnel is currently bound to if necessary. More...
 
int connect_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Tries to connect a tunnel by creating a new CADET channel and binding it. More...
 
void disconnect_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Disconnects and unbinds a channel from a tunnel. More...
 
int is_tunnel_connected (const struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Returns the status of a currently bound channel of a tunnel. More...
 
void send_tunnel_envelope (struct GNUNET_MESSENGER_SrvTunnel *tunnel, struct GNUNET_MQ_Envelope *env, const struct GNUNET_HashCode *hash)
 Sends an envelope containing a message with a given hash through a tunnel. More...
 
int send_tunnel_message (struct GNUNET_MESSENGER_SrvTunnel *tunnel, void *handle, struct GNUNET_MESSENGER_Message *message)
 Sends a message by packing it automatically into an envelope and passing it through the tunnel. More...
 
void forward_tunnel_message (struct GNUNET_MESSENGER_SrvTunnel *tunnel, const struct GNUNET_MESSENGER_Message *message, const struct GNUNET_HashCode *hash)
 Forwards a given message with a known hash through a tunnel. More...
 
const struct GNUNET_HashCodeget_tunnel_peer_message (const struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Returns the hash of the latest peer message published through a given tunnel and matching the tunnels peer identity. More...
 
void get_tunnel_peer_identity (const struct GNUNET_MESSENGER_SrvTunnel *tunnel, struct GNUNET_PeerIdentity *peer)
 Writes the peer identity of the peer connected via tunnel to this peer into the peer parameter. More...
 
uint32_t get_tunnel_messenger_version (const struct GNUNET_MESSENGER_SrvTunnel *tunnel)
 Returns the current messenger version the peer connected via a given tunnel has reported to be using if it was compatible during updating. More...
 
int update_tunnel_messenger_version (struct GNUNET_MESSENGER_SrvTunnel *tunnel, uint32_t version)
 Updates the messenger version of the tunnel to a given version if it is compatible to the running peer of the service. More...
 

Detailed Description

GNUnet MESSENGER service.

Author
Tobias Frisch

Definition in file gnunet-service-messenger_tunnel.h.

Function Documentation

◆ create_tunnel()

struct GNUNET_MESSENGER_SrvTunnel* create_tunnel ( struct GNUNET_MESSENGER_SrvRoom room,
const struct GNUNET_PeerIdentity door 
)

Creates and allocates a tunnel of a room to a specific peer identity (called door).

Parameters

Definition at line 36 of file gnunet-service-messenger_tunnel.c.

References GNUNET_MESSENGER_SrvTunnel::channel, GNUNET_assert, GNUNET_new, GNUNET_PEER_intern(), init_message_state(), GNUNET_MESSENGER_SrvTunnel::messenger_version, GNUNET_MESSENGER_SrvTunnel::peer, GNUNET_MESSENGER_SrvTunnel::peer_message, GNUNET_MESSENGER_SrvTunnel::room, and GNUNET_MESSENGER_SrvTunnel::state.

Referenced by callback_room_connect(), and enter_room_at().

37 {
38  GNUNET_assert((room) && (door));
39 
41 
42  tunnel->room = room;
43  tunnel->channel = NULL;
44 
45  tunnel->peer = GNUNET_PEER_intern (door);
46 
47  tunnel->messenger_version = 0;
48 
49  tunnel->peer_message = NULL;
50 
51  init_message_state(&(tunnel->state));
52 
53  return tunnel;
54 }
void init_message_state(struct GNUNET_MESSENGER_MessageState *state)
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct GNUNET_MESSENGER_SrvRoom * room
struct GNUNET_CADET_Channel * channel
struct GNUNET_MESSENGER_MessageState state
GNUNET_PEER_Id GNUNET_PEER_intern(const struct GNUNET_PeerIdentity *pid)
Intern an peer identity.
Definition: peer.c:107
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◆ destroy_tunnel()

void destroy_tunnel ( struct GNUNET_MESSENGER_SrvTunnel tunnel)

Destroys a tunnel and frees its memory fully.

Parameters

Definition at line 57 of file gnunet-service-messenger_tunnel.c.

References GNUNET_MESSENGER_SrvTunnel::channel, clear_message_state(), GNUNET_assert, GNUNET_CADET_channel_destroy(), GNUNET_free, GNUNET_PEER_change_rc(), GNUNET_MESSENGER_SrvTunnel::peer, GNUNET_MESSENGER_SrvTunnel::peer_message, and GNUNET_MESSENGER_SrvTunnel::state.

58 {
59  GNUNET_assert(tunnel);
60 
61  if (tunnel->channel)
63 
64  GNUNET_PEER_change_rc (tunnel->peer, -1);
65 
66  if (tunnel->peer_message)
67  GNUNET_free(tunnel->peer_message);
68 
69  clear_message_state(&(tunnel->state));
70 
71  GNUNET_free(tunnel);
72 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void clear_message_state(struct GNUNET_MESSENGER_MessageState *state)
struct GNUNET_CADET_Channel * channel
struct GNUNET_MESSENGER_MessageState state
void GNUNET_PEER_change_rc(GNUNET_PEER_Id id, int delta)
Change the reference counter of an interned PID.
Definition: peer.c:197
void GNUNET_CADET_channel_destroy(struct GNUNET_CADET_Channel *channel)
Destroy an existing channel.
Definition: cadet_api.c:837
#define GNUNET_free(ptr)
Wrapper around free.
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◆ bind_tunnel()

void bind_tunnel ( struct GNUNET_MESSENGER_SrvTunnel tunnel,
struct GNUNET_CADET_Channel channel 
)

Binds a CADET channel to a tunnel and replaces its channel the tunnel is currently bound to if necessary.

Parameters

Definition at line 75 of file gnunet-service-messenger_tunnel.c.

References callback_room_disconnect(), GNUNET_MESSENGER_SrvTunnel::channel, delayed_disconnect_channel(), GNUNET_assert, and GNUNET_MESSENGER_SrvTunnel::room.

Referenced by callback_room_connect().

76 {
77  GNUNET_assert(tunnel);
78 
79  if (tunnel->channel)
81 
82  tunnel->channel = channel;
83 }
void delayed_disconnect_channel(struct GNUNET_CADET_Channel *channel)
Starts an urgent task to close a CADET channel asynchronously.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_CADET_Channel * channel
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◆ connect_tunnel()

int connect_tunnel ( struct GNUNET_MESSENGER_SrvTunnel tunnel)

Tries to connect a tunnel by creating a new CADET channel and binding it.

The function returns GNUNET_YES on success, otherwise GNUNET_NO.

Parameters

Definition at line 222 of file gnunet-service-messenger_tunnel.c.

References cadet, callback_tunnel_disconnect(), GNUNET_MESSENGER_SrvTunnel::channel, convert_messenger_key_to_port(), get_room_cadet(), get_room_key(), GNUNET_assert, GNUNET_CADET_channel_create(), GNUNET_MESSAGE_TYPE_CADET_CLI, GNUNET_MQ_handler_end, GNUNET_MQ_hd_var_size, GNUNET_NO, GNUNET_PEER_resolve2(), GNUNET_YES, key, GNUNET_MESSENGER_SrvTunnel::peer, and GNUNET_MESSENGER_SrvTunnel::room.

Referenced by enter_room_at(), and rebuild_room_basement_structure().

223 {
224  GNUNET_assert(tunnel);
225 
226  if (tunnel->channel)
227  return GNUNET_NO;
228 
229  const struct GNUNET_PeerIdentity *door = GNUNET_PEER_resolve2 (tunnel->peer);
230 
231  struct GNUNET_CADET_Handle *cadet = get_room_cadet (tunnel->room);
232  const struct GNUNET_HashCode *key = get_room_key (tunnel->room);
233 
235  struct GNUNET_MessageHeader, NULL),
237 
238  struct GNUNET_HashCode port;
240  tunnel->channel = GNUNET_CADET_channel_create (cadet, tunnel, door, &port, NULL, callback_tunnel_disconnect, handlers);
241 
242  return GNUNET_YES;
243 }
const struct GNUNET_PeerIdentity * GNUNET_PEER_resolve2(GNUNET_PEER_Id id)
Convert an interned PID to a normal peer identity.
Definition: peer.c:245
static struct GNUNET_CADET_Handle * cadet
Handle for cadet.
Opaque handle to the service.
Definition: cadet_api.c:38
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void callback_tunnel_disconnect(void *cls, const struct GNUNET_CADET_Channel *channel)
#define GNUNET_MESSAGE_TYPE_CADET_CLI
Traffic (net-cat style) used by the Command Line Interface.
struct GNUNET_CADET_Handle * get_room_cadet(struct GNUNET_MESSENGER_SrvRoom *room)
Returns the CADET handle from a rooms service.
static struct GNUNET_CADET_MessageHandler handlers[]
Handlers, for diverse services.
#define GNUNET_MQ_hd_var_size(name, code, str, ctx)
struct GNUNET_MESSENGER_SrvRoom * room
A 512-bit hashcode.
Message handler for a specific message type.
struct GNUNET_HashCode key
The key used in the DHT.
struct GNUNET_CADET_Channel * channel
void convert_messenger_key_to_port(const struct GNUNET_HashCode *key, struct GNUNET_HashCode *port)
Converts a Messenger service key of a room to the specific port which gets used for the CADET channel...
The identity of the host (wraps the signing key of the peer).
struct GNUNET_CADET_Channel * GNUNET_CADET_channel_create(struct GNUNET_CADET_Handle *h, void *channel_cls, const struct GNUNET_PeerIdentity *destination, const struct GNUNET_HashCode *port, GNUNET_CADET_WindowSizeEventHandler window_changes, GNUNET_CADET_DisconnectEventHandler disconnects, const struct GNUNET_MQ_MessageHandler *handlers)
Create a new channel towards a remote peer.
Definition: cadet_api.c:1031
static uint16_t port
Port number.
Definition: gnunet-bcd.c:83
const struct GNUNET_HashCode * get_room_key(const struct GNUNET_MESSENGER_SrvRoom *room)
Returns the shared secret you need to access a room.
Header for all communications.
#define GNUNET_MQ_handler_end()
End-marker for the handlers array.
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◆ disconnect_tunnel()

void disconnect_tunnel ( struct GNUNET_MESSENGER_SrvTunnel tunnel)

Disconnects and unbinds a channel from a tunnel.

The actual disconnection will be asynchronous.

Parameters

Definition at line 246 of file gnunet-service-messenger_tunnel.c.

References GNUNET_MESSENGER_SrvTunnel::channel, delayed_disconnect_channel(), and GNUNET_assert.

Referenced by callback_room_connect(), rebuild_room_basement_structure(), and recv_message_info().

247 {
248  GNUNET_assert(tunnel);
249 
250  if (tunnel->channel)
251  {
253 
254  tunnel->channel = NULL;
255  }
256 }
void delayed_disconnect_channel(struct GNUNET_CADET_Channel *channel)
Starts an urgent task to close a CADET channel asynchronously.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_CADET_Channel * channel
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◆ is_tunnel_connected()

int is_tunnel_connected ( const struct GNUNET_MESSENGER_SrvTunnel tunnel)

Returns the status of a currently bound channel of a tunnel.

Parameters
[in]tunnelTunnel
Returns
GNUNET_YES or GNUNET_NO

Definition at line 259 of file gnunet-service-messenger_tunnel.c.

References GNUNET_MESSENGER_SrvTunnel::channel, GNUNET_assert, GNUNET_NO, and GNUNET_YES.

Referenced by iterate_send_room_message(), and send_room_info().

260 {
261  GNUNET_assert(tunnel);
262 
263  return (tunnel->channel ? GNUNET_YES : GNUNET_NO);
264 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_CADET_Channel * channel
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◆ send_tunnel_envelope()

void send_tunnel_envelope ( struct GNUNET_MESSENGER_SrvTunnel tunnel,
struct GNUNET_MQ_Envelope env,
const struct GNUNET_HashCode hash 
)

Sends an envelope containing a message with a given hash through a tunnel.

Parameters

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

References callback_tunnel_sent(), GNUNET_MESSENGER_SrvTunnel::channel, GNUNET_assert, GNUNET_CADET_get_mq(), GNUNET_memcpy, GNUNET_MQ_notify_sent(), GNUNET_MQ_send(), GNUNET_new, GNUNET_MESSENGER_MessageSent::hash, mq, and GNUNET_MESSENGER_MessageSent::tunnel.

Referenced by forward_tunnel_message(), iterate_send_room_message(), and send_tunnel_message().

286 {
287  GNUNET_assert((tunnel) && (env) && (hash));
288 
289  struct GNUNET_MQ_Handle *mq = GNUNET_CADET_get_mq (tunnel->channel);
290 
292 
293  GNUNET_memcpy(&(sent->hash), hash, sizeof(struct GNUNET_HashCode));
294 
295  sent->tunnel = tunnel;
296 
298  GNUNET_MQ_send (mq, env);
299 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GNUNET_MQ_notify_sent(struct GNUNET_MQ_Envelope *ev, GNUNET_SCHEDULER_TaskCallback cb, void *cb_cls)
Call a callback once the envelope has been sent, that is, sending it can not be canceled anymore...
Definition: mq.c:787
A 512-bit hashcode.
struct GNUNET_MESSENGER_SrvTunnel * tunnel
struct GNUNET_CADET_Channel * channel
Handle to a message queue.
Definition: mq.c:85
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:355
static void callback_tunnel_sent(void *cls)
struct GNUNET_MQ_Handle * GNUNET_CADET_get_mq(const struct GNUNET_CADET_Channel *channel)
Obtain the message queue for a connected peer.
Definition: cadet_api.c:1082
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◆ send_tunnel_message()

int send_tunnel_message ( struct GNUNET_MESSENGER_SrvTunnel tunnel,
void *  handle,
struct GNUNET_MESSENGER_Message message 
)

Sends a message by packing it automatically into an envelope and passing it through the tunnel.

The used handle will sign the message and the hash will be calculated and stored.

Parameters

Definition at line 302 of file gnunet-service-messenger_tunnel.c.

References destroy_message(), env, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSENGER_PACK_MODE_ENVELOPE, GNUNET_NO, GNUNET_YES, pack_room_message(), GNUNET_MESSENGER_SrvTunnel::room, and send_tunnel_envelope().

Referenced by recv_message_info(), and send_room_info().

303 {
304  GNUNET_assert((tunnel) && (handle));
305 
306  if (!message)
307  return GNUNET_NO;
308 
309  struct GNUNET_HashCode hash;
311  tunnel->room, (struct GNUNET_MESSENGER_SrvHandle*) handle,
313  );
314 
315  destroy_message(message);
316 
317  if (!env)
318  return GNUNET_NO;
319 
320  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Sending tunnel message: %s\n",
321  GNUNET_h2s(&hash));
322 
323  send_tunnel_envelope (tunnel, env, &hash);
324  return GNUNET_YES;
325 }
void destroy_message(struct GNUNET_MESSENGER_Message *message)
Destroys a message and frees its memory fully.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
struct GNUNET_MQ_Envelope * pack_room_message(const struct GNUNET_MESSENGER_SrvRoom *room, const struct GNUNET_MESSENGER_SrvHandle *handle, struct GNUNET_MESSENGER_Message *message, struct GNUNET_HashCode *hash, int mode)
Packs a message depending on the selected mode into a newly allocated envelope.
struct GNUNET_MESSENGER_SrvRoom * room
static struct GNUNET_DNS_Handle * handle
Handle to transport service.
A 512-bit hashcode.
#define GNUNET_MESSENGER_PACK_MODE_ENVELOPE
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
#define GNUNET_log(kind,...)
void send_tunnel_envelope(struct GNUNET_MESSENGER_SrvTunnel *tunnel, struct GNUNET_MQ_Envelope *env, const struct GNUNET_HashCode *hash)
Sends an envelope containing a message with a given hash through a tunnel.
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◆ forward_tunnel_message()

void forward_tunnel_message ( struct GNUNET_MESSENGER_SrvTunnel tunnel,
const struct GNUNET_MESSENGER_Message message,
const struct GNUNET_HashCode hash 
)

Forwards a given message with a known hash through a tunnel.

Parameters

Definition at line 328 of file gnunet-service-messenger_tunnel.c.

References copy_message(), destroy_message(), env, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_MESSENGER_PACK_MODE_ENVELOPE, pack_message(), and send_tunnel_envelope().

Referenced by callback_found_message(), check_room_peer_status(), and forward_about_members().

330 {
331  GNUNET_assert((tunnel) && (message) && (hash));
332 
333  struct GNUNET_MESSENGER_Message *copy = copy_message(message);
335 
336  destroy_message(copy);
337 
338  if (!env)
339  return;
340 
341  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Forwarding tunnel message: %s\n",
342  GNUNET_h2s(hash));
343 
344  send_tunnel_envelope (tunnel, env, hash);
345 }
void destroy_message(struct GNUNET_MESSENGER_Message *message)
Destroys a message and frees its memory fully.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
struct GNUNET_MQ_Envelope * pack_message(struct GNUNET_MESSENGER_Message *message, struct GNUNET_HashCode *hash, const struct GNUNET_MESSENGER_Ego *ego, int mode)
Encodes the message to pack it into a newly allocated envelope if mode is equal to GNUNET_MESSENGER_P...
struct GNUNET_MESSENGER_Message * copy_message(const struct GNUNET_MESSENGER_Message *message)
Creates and allocates a copy of a given message.
#define GNUNET_MESSENGER_PACK_MODE_ENVELOPE
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
#define GNUNET_log(kind,...)
void send_tunnel_envelope(struct GNUNET_MESSENGER_SrvTunnel *tunnel, struct GNUNET_MQ_Envelope *env, const struct GNUNET_HashCode *hash)
Sends an envelope containing a message with a given hash through a tunnel.
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◆ get_tunnel_peer_message()

const struct GNUNET_HashCode* get_tunnel_peer_message ( const struct GNUNET_MESSENGER_SrvTunnel tunnel)

Returns the hash of the latest peer message published through a given tunnel and matching the tunnels peer identity.

If no peer message has been linked to the tunnel yet, NULL gets returned.

Parameters
[in]tunnelTunnel
Returns
Hash of peer message or NULL

Definition at line 348 of file gnunet-service-messenger_tunnel.c.

References GNUNET_assert, and GNUNET_MESSENGER_SrvTunnel::peer_message.

349 {
350  GNUNET_assert(tunnel);
351 
352  return tunnel->peer_message;
353 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.

◆ get_tunnel_peer_identity()

void get_tunnel_peer_identity ( const struct GNUNET_MESSENGER_SrvTunnel tunnel,
struct GNUNET_PeerIdentity peer 
)

Writes the peer identity of the peer connected via tunnel to this peer into the peer parameter.

Parameters
[in]tunnelTunnel
[out]peerPeer identity

Definition at line 356 of file gnunet-service-messenger_tunnel.c.

References GNUNET_assert, GNUNET_PEER_resolve(), and GNUNET_MESSENGER_SrvTunnel::peer.

Referenced by callback_room_disconnect(), and recv_message_info().

357 {
358  GNUNET_assert(tunnel);
359 
360  GNUNET_PEER_resolve(tunnel->peer, peer);
361 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
void GNUNET_PEER_resolve(GNUNET_PEER_Id id, struct GNUNET_PeerIdentity *pid)
Convert an interned PID to a normal peer identity.
Definition: peer.c:225
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◆ get_tunnel_messenger_version()

uint32_t get_tunnel_messenger_version ( const struct GNUNET_MESSENGER_SrvTunnel tunnel)

Returns the current messenger version the peer connected via a given tunnel has reported to be using if it was compatible during updating.

See also
update_tunnel_messenger_version
Parameters
[in]tunnelTunnel
Returns
Version of messenger

Definition at line 364 of file gnunet-service-messenger_tunnel.c.

References GNUNET_assert, and GNUNET_MESSENGER_SrvTunnel::messenger_version.

Referenced by iterate_send_room_message(), and recv_message_info().

365 {
366  GNUNET_assert(tunnel);
367 
368  return tunnel->messenger_version;
369 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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◆ update_tunnel_messenger_version()

int update_tunnel_messenger_version ( struct GNUNET_MESSENGER_SrvTunnel tunnel,
uint32_t  version 
)

Updates the messenger version of the tunnel to a given version if it is compatible to the running peer of the service.

Depending on success it returns GNUNET_OK or GNUNET_SYSERR on failure.

Parameters

Definition at line 372 of file gnunet-service-messenger_tunnel.c.

References GNUNET_assert, GNUNET_MESSENGER_VERSION, GNUNET_OK, GNUNET_SYSERR, and GNUNET_MESSENGER_SrvTunnel::messenger_version.

Referenced by recv_message_info().

373 {
374  GNUNET_assert(tunnel);
375 
376  if (version != GNUNET_MESSENGER_VERSION)
377  return GNUNET_SYSERR;
378 
379  if (version > tunnel->messenger_version)
380  tunnel->messenger_version = version;
381 
382  return GNUNET_OK;
383 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_MESSENGER_VERSION
Version number of GNUnet Messenger API.
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