gnunet-communicator-tcp.c File Reference

Transport plugin using TCP. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_core_service.h"
#include "gnunet_peerstore_service.h"
#include "gnunet_protocols.h"
#include "gnunet_signatures.h"
#include "gnunet_constants.h"
#include "gnunet_nt_lib.h"
#include "gnunet_nat_service.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_communication_service.h"
#include "gnunet_resolver_service.h"

Include dependency graph for gnunet-communicator-tcp.c:

Go to the source code of this file.

Data Structures
struct	TcpHandshakeSignature
	Signature we use to verify that the ephemeral key was really chosen by the specified sender. More...
struct	TcpHandshakeAckSignature
	Signature we use to verify that the ack from the receiver of the ephemeral key was really send by the specified sender. More...
struct	TCPConfirmation
	Encrypted continuation of TCP initial handshake. More...
struct	TCPConfirmationAck
	Ack for the encrypted continuation of TCP initial handshake. More...
struct	TCPBox
	TCP message box. More...
struct	TCPRekey
	TCP rekey message box. More...
struct	TcpRekeySignature
	Signature we use to verify that the ephemeral key was really chosen by the specified sender. More...
struct	TCPFinish
	TCP finish. More...
struct	ListenTask
	Struct to use as closure. More...
struct	Queue
	Handle for a queue. More...
struct	ProtoQueue
	Handle for an incoming connection where we do not yet have enough information to setup a full queue. More...
struct	PortOnlyIpv4Ipv6
	In case of port only configuration we like to bind to ipv4 and ipv6 addresses. More...
struct	Addresses
	DLL to store the addresses we like to register at NAT service. More...

Macros
#define	ADDRESS_VALIDITY_PERIOD   GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)
	How long do we believe our addresses to remain up (before the other peer should revalidate). More...
#define	DEFAULT_MAX_QUEUE_LENGTH   8
	How many messages do we keep at most in the queue to the transport service before we start to drop (default, can be changed via the configuration file). More...
#define	BUF_SIZE   (2 * 64 * 1024 + sizeof(struct TCPBox))
	Size of our IO buffers for ciphertext data. More...
#define	DEFAULT_REKEY_INTERVAL   GNUNET_TIME_UNIT_DAYS
	How often do we rekey based on time (at least) More...
#define	PROTO_QUEUE_TIMEOUT   GNUNET_TIME_UNIT_MINUTES
	How long do we wait until we must have received the initial KX? More...
#define	REKEY_MAX_BYTES   (1024LLU * 1024 * 1024 * 4LLU)
	How often do we rekey based on number of bytes transmitted? (additionally randomized). More...
#define	INITIAL_KX_SIZE
	Size of the initial key exchange message sent first in both directions. More...
#define	INITIAL_CORE_KX_SIZE
	Size of the initial core key exchange messages. More...
#define	COMMUNICATOR_ADDRESS_PREFIX   "tcp"
	Address prefix used by the communicator. More...
#define	COMMUNICATOR_CONFIG_SECTION   "communicator-tcp"
	Configuration section used by the communicator. More...

Functions
static void	listen_cb (void *cls)
	We have been notified that our listen socket has something to read. More...
static void	queue_destroy (struct Queue *queue)
	Functions with this signature are called whenever we need to close a queue due to a disconnect or failure to establish a connection. More...
static void	calculate_hmac (struct GNUNET_HashCode *hmac_secret, const void *buf, size_t buf_size, struct GNUNET_ShortHashCode *smac)
	Compute mac over buf, and ratched the hmac_secret. More...
static void	queue_finish (struct Queue *queue)
	Append a 'finish' message to the outgoing transmission. More...
static void	reschedule_queue_timeout (struct Queue *queue)
	Increment queue timeout due to activity. More...
static void	queue_read (void *cls)
	Queue read task. More...
static void	core_read_finished_cb (void *cls, int success)
	Core tells us it is done processing a message that transport received on a queue with status success. More...
static void	pass_plaintext_to_core (struct Queue *queue, const void *plaintext, size_t plaintext_len)
	We received plaintext_len bytes of plaintext on queue. More...
static void	setup_cipher (const struct GNUNET_HashCode *dh, const struct GNUNET_PeerIdentity *pid, gcry_cipher_hd_t *cipher, struct GNUNET_HashCode *hmac_key)
	Setup cipher based on shared secret dh and decrypting peer pid. More...
static void	rekey_monotime_store_cb (void *cls, int success)
	Callback called when peerstore store operation for rekey monotime value is finished. More...
static void	rekey_monotime_cb (void *cls, const struct GNUNET_PEERSTORE_Record *record, const char *emsg)
	Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY where found. More...
static void	setup_in_cipher (const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
	Setup cipher of queue for decryption. More...
static void	do_rekey (struct Queue *queue, const struct TCPRekey *rekey)
	Handle rekey message on queue. More...
static void	handshake_ack_monotime_store_cb (void *cls, int success)
	Callback called when peerstore store operation for handshake ack monotime value is finished. More...
static void	handshake_ack_monotime_cb (void *cls, const struct GNUNET_PEERSTORE_Record *record, const char *emsg)
	Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK where found. More...
static void	send_challenge (struct ChallengeNonceP challenge, struct Queue *queue)
	Sending challenge with TcpConfirmationAck back to sender of ephemeral key. More...
static void	setup_out_cipher (struct Queue *queue)
	Setup cipher for outgoing data stream based on target and our ephemeral private key. More...
static void	inject_rekey (struct Queue *queue)
	Inject a struct TCPRekey message into the queue's plaintext buffer. More...
static void	queue_write (void *cls)
	We have been notified that our socket is ready to write. More...
static size_t	try_handle_plaintext (struct Queue *queue)
	Test if we have received a full message in plaintext. More...
static struct sockaddr *	tcp_address_to_sockaddr_numeric_v6 (socklen_t *sock_len, struct sockaddr_in6 v6, unsigned int port)
	Convert a struct sockaddr_in6 to astruct sockaddr *`. More...
static struct sockaddr *	tcp_address_to_sockaddr_numeric_v4 (socklen_t *sock_len, struct sockaddr_in v4, unsigned int port)
	Convert a struct sockaddr_in4 to astruct sockaddr *`. More...
static struct PortOnlyIpv4Ipv6 *	tcp_address_to_sockaddr_port_only (const char *bindto, unsigned int *port)
	Convert TCP bind specification to a struct PortOnlyIpv4Ipv6 * More...
static char *	extract_address (const char *bindto)
	This Method extracts the address part of the BINDTO string. More...
static unsigned int	extract_port (const char *addr_and_port)
	This Method extracts the port part of the BINDTO string. More...
static struct sockaddr *	tcp_address_to_sockaddr (const char *bindto, socklen_t *sock_len)
	Convert TCP bind specification to a struct sockaddr * More...
static void	mq_send (struct GNUNET_MQ_Handle *mq, const struct GNUNET_MessageHeader *msg, void *impl_state)
	Signature of functions implementing the sending functionality of a message queue. More...
static void	mq_destroy (struct GNUNET_MQ_Handle *mq, void *impl_state)
	Signature of functions implementing the destruction of a message queue. More...
static void	mq_cancel (struct GNUNET_MQ_Handle *mq, void *impl_state)
	Implementation function that cancels the currently sent message. More...
static void	mq_error (void *cls, enum GNUNET_MQ_Error error)
	Generic error handler, called with the appropriate error code and the same closure specified at the creation of the message queue. More...
static void	boot_queue (struct Queue *queue)
	Add the given queue to our internal data structure. More...
static void	transmit_kx (struct Queue *queue, const struct GNUNET_CRYPTO_EcdhePublicKey *epub)
	Generate and transmit our ephemeral key and the signature for the initial KX with the other peer. More...
static void	start_initial_kx_out (struct Queue *queue)
	Initialize our key material for outgoing transmissions and inform the other peer about it. More...
static void	handshake_monotime_store_cb (void *cls, int success)
	Callback called when peerstore store operation for handshake monotime is finished. More...
static void	handshake_monotime_cb (void *cls, const struct GNUNET_PEERSTORE_Record *record, const char *emsg)
	Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE where found. More...
static int	decrypt_and_check_tc (struct Queue *queue, struct TCPConfirmation *tc, char *ibuf)
	We have received the first bytes from the other side on a queue. More...
static void	free_proto_queue (struct ProtoQueue *pq)
	Closes socket and frees memory associated with pq. More...
static void	proto_read_kx (void *cls)
	Read from the socket of the proto queue until we have enough data to upgrade to full queue. More...
static void	queue_read_kx (void *cls)
	Read from the socket of the queue until we have enough data to initialize the decryption logic and can switch to regular reading. More...
static int	mq_init (void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
	Function called by the transport service to initialize a message queue given address information about another peer. More...
static int	get_lt_delete_it (void *cls, const struct GNUNET_HashCode *key, void *value)
	Iterator over all ListenTasks to clean up. More...
static int	get_queue_delete_it (void *cls, const struct GNUNET_PeerIdentity *target, void *value)
	Iterator over all message queues to clean up. More...
static void	do_shutdown (void *cls)
	Shutdown the UNIX communicator. More...
static void	enc_notify_cb (void *cls, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg)
	Function called when the transport service has received an acknowledgement for this communicator (!) via a different return path. More...
static void	nat_address_cb (void *cls, void **app_ctx, int add_remove, enum GNUNET_NAT_AddressClass ac, const struct sockaddr *addr, socklen_t addrlen)
	Signature of the callback passed to GNUNET_NAT_register() for a function to call whenever our set of 'valid' addresses changes. More...
static void	add_addr (struct sockaddr *in, socklen_t in_len)
	This method adds addresses to the DLL, that are later register at the NAT service. More...
static int	init_socket (struct sockaddr *addr, socklen_t in_len)
	This method launch network interactions for each address we like to bind to. More...
static void	nat_register ()
	This method reads from the DLL addrs_head to register them at the NAT service. More...
static void	init_socket_resolv (void *cls, const struct sockaddr *addr, socklen_t in_len)
	This method is the callback called by the resolver API, and wraps method init_socket. More...
static void	run (void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
	Setup communicator and launch network interactions. More...
int	main (int argc, char *const *argv)
	The main function for the UNIX communicator. More...

Variables
static unsigned long long	max_queue_length
	Maximum queue length before we stop reading towards the transport service. More...
static struct GNUNET_STATISTICS_Handle *	stats
	For logging statistics. More...
static struct GNUNET_TRANSPORT_CommunicatorHandle *	ch
	Our environment. More...
static struct GNUNET_CONTAINER_MultiPeerMap *	queue_map
	Queues (map from peer identity to struct Queue) More...
static struct GNUNET_CONTAINER_MultiHashMap *	lt_map
	ListenTasks (map from socket to struct ListenTask) More...
static struct GNUNET_PeerIdentity	my_identity
	Our public key. More...
static struct GNUNET_TIME_Relative	rekey_interval
	The rekey interval. More...
static struct GNUNET_CRYPTO_EddsaPrivateKey *	my_private_key
	Our private key. More...
static const struct GNUNET_CONFIGURATION_Handle *	cfg
	Our configuration. More...
static struct GNUNET_NT_InterfaceScanner *	is
	Network scanner to determine network types. More...
static struct GNUNET_NAT_Handle *	nat
	Connection to NAT service. More...
static struct ProtoQueue *	proto_head
	Protoqueues DLL head. More...
static struct ProtoQueue *	proto_tail
	Protoqueues DLL tail. More...
struct GNUNET_RESOLVER_RequestHandle *	resolve_request_handle
	Handle for DNS lookup of bindto address. More...
struct Addresses *	addrs_head
	Head of DLL with addresses we like to register at NAT servcie. More...
struct Addresses *	addrs_tail
	Head of DLL with addresses we like to register at NAT servcie. More...
struct ListenTask *	lts_head
	Head of DLL with ListenTasks. More...
struct ListenTask *	lts_tail
	Head of DLL with ListenTask. More...
int	addrs_lens
	Number of addresses in the DLL for register at NAT service. More...
size_t	unverified_size
	Size of data received without KX challenge played back. More...
static struct GNUNET_PEERSTORE_Handle *	peerstore
	Database for peer's HELLOs. More...
int	shutdown_running = GNUNET_NO
	A flag indicating we are already doing a shutdown. More...
unsigned int	bind_port
	The port the communicator should be assigned to. More...

Detailed Description

Transport plugin using TCP.

Author

Christian Grothoff

TODO:

• support NAT connection reversal method (#5529)
• support other TCP-specific NAT traversal methods (#5531)

Definition in file gnunet-communicator-tcp.c.

Macro Definition Documentation

ADDRESS_VALIDITY_PERIOD

#define ADDRESS_VALIDITY_PERIOD   GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 4)

How long do we believe our addresses to remain up (before the other peer should revalidate).

Definition at line 47 of file gnunet-communicator-tcp.c.

Referenced by pass_plaintext_to_core().

DEFAULT_MAX_QUEUE_LENGTH

#define DEFAULT_MAX_QUEUE_LENGTH   8

How many messages do we keep at most in the queue to the transport service before we start to drop (default, can be changed via the configuration file).

Should be below the level of the communicator API, as otherwise we may read messages just to have them dropped by the communicator API.

Definition at line 58 of file gnunet-communicator-tcp.c.

Referenced by run().

BUF_SIZE

#define BUF_SIZE   (2 * 64 * 1024 + sizeof(struct TCPBox))

Size of our IO buffers for ciphertext data.

Must be at least UINT_MAX + sizeof (struct TCPBox).

Definition at line 64 of file gnunet-communicator-tcp.c.

Referenced by queue_read(), queue_read_kx(), and queue_write().

DEFAULT_REKEY_INTERVAL

#define DEFAULT_REKEY_INTERVAL   GNUNET_TIME_UNIT_DAYS

How often do we rekey based on time (at least)

Definition at line 69 of file gnunet-communicator-tcp.c.

Referenced by run().

PROTO_QUEUE_TIMEOUT

#define PROTO_QUEUE_TIMEOUT   GNUNET_TIME_UNIT_MINUTES

How long do we wait until we must have received the initial KX?

Definition at line 74 of file gnunet-communicator-tcp.c.

Referenced by listen_cb().

REKEY_MAX_BYTES

#define REKEY_MAX_BYTES   (1024LLU * 1024 * 1024 * 4LLU)

How often do we rekey based on number of bytes transmitted? (additionally randomized).

Definition at line 80 of file gnunet-communicator-tcp.c.

Referenced by setup_out_cipher().

INITIAL_KX_SIZE

#define INITIAL_KX_SIZE

Value:

(sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)   \
   + sizeof(struct TCPConfirmation))

Size of the initial key exchange message sent first in both directions.

Definition at line 86 of file gnunet-communicator-tcp.c.

Referenced by queue_read_kx().

INITIAL_CORE_KX_SIZE

#define INITIAL_CORE_KX_SIZE

Value:

(sizeof(struct EphemeralKeyMessage)   \
   + sizeof(struct PingMessage) \
   + sizeof(struct PongMessage))

Size of the initial core key exchange messages.

Definition at line 93 of file gnunet-communicator-tcp.c.

Referenced by try_handle_plaintext().

COMMUNICATOR_ADDRESS_PREFIX

#define COMMUNICATOR_ADDRESS_PREFIX   "tcp"

Address prefix used by the communicator.

Definition at line 101 of file gnunet-communicator-tcp.c.

Referenced by init_socket(), mq_init(), nat_address_cb(), and try_handle_plaintext().

COMMUNICATOR_CONFIG_SECTION

#define COMMUNICATOR_CONFIG_SECTION   "communicator-tcp"

Configuration section used by the communicator.

Definition at line 106 of file gnunet-communicator-tcp.c.

Referenced by init_socket(), nat_register(), run(), and tcp_address_to_sockaddr_port_only().

Function Documentation

listen_cb()

static void listen_cb ( void *  cls )

static

We have been notified that our listen socket has something to read.

Do the read and reschedule this function to be called again once more is available.

Parameters

cls

NULL

Do the read and reschedule this function to be called again once more is available.

Parameters

cls	ListenTask with listening socket and task

Definition at line 2779 of file gnunet-communicator-tcp.c.

References ProtoQueue::address, ProtoQueue::address_len, GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_memdup, GNUNET_NETWORK_socket_accept(), GNUNET_new, GNUNET_SCHEDULER_add_read_net(), GNUNET_TIME_relative_to_absolute(), GNUNET_TIME_UNIT_FOREVER_REL, ListenTask::listen_sock, ListenTask::listen_task, PROTO_QUEUE_TIMEOUT, proto_read_kx(), ProtoQueue::read_task, ProtoQueue::sock, and ProtoQueue::timeout.

Referenced by GNUNET_SET_listen(), GNUNET_SETI_listen(), GNUNET_SETU_listen(), init_socket(), and queue_destroy().

{
  struct sockaddr_storage in;
  socklen_t addrlen;
  struct GNUNET_NETWORK_Handle *sock;
  struct ProtoQueue *pq;
  struct ListenTask *lt;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "listen_cb\n");

  lt = cls;

  lt->listen_task = NULL;
  GNUNET_assert (NULL != lt->listen_sock);
  addrlen = sizeof(in);
  memset (&in, 0, sizeof(in));
  sock = GNUNET_NETWORK_socket_accept (lt->listen_sock,
                                       (struct sockaddr*) &in,
                                       &addrlen);
  if ((NULL == sock) && ((EMFILE == errno) || (ENFILE == errno)))
    return; /* system limit reached, wait until connection goes down */
  lt->listen_task = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                                   lt->listen_sock,
                                                   &listen_cb,
                                                   lt);
  if ((NULL == sock) && ((EAGAIN == errno) || (ENOBUFS == errno)))
    return;
  if (NULL == sock)
  {
    GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "accept");
    return;
  }
  pq = GNUNET_new (struct ProtoQueue);
  pq->address_len = addrlen;
  pq->address = GNUNET_memdup (&in, addrlen);
  pq->timeout = GNUNET_TIME_relative_to_absolute (PROTO_QUEUE_TIMEOUT);
  pq->sock = sock;
  pq->read_task = GNUNET_SCHEDULER_add_read_net (PROTO_QUEUE_TIMEOUT,
                                                 pq->sock,
                                                 &proto_read_kx,
                                                 pq);
  GNUNET_CONTAINER_DLL_insert (proto_head, proto_tail, pq);
}

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queue_destroy()

static void queue_destroy ( struct Queue *  queue )

static

Functions with this signature are called whenever we need to close a queue due to a disconnect or failure to establish a connection.

Parameters

queue

queue to close down

Definition at line 876 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::backpressure, Queue::destroyed, GNUNET_assert, GNUNET_CONTAINER_multihashmap_get(), GNUNET_CONTAINER_multipeermap_remove(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_NETWORK_socket_close(), GNUNET_NO, GNUNET_PEERSTORE_iterate_cancel(), GNUNET_PEERSTORE_store_cancel(), GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_set(), GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_communicator_mq_del(), GNUNET_YES, Queue::handshake_ack_monotime_get, Queue::handshake_ack_monotime_sc, Queue::handshake_monotime_get, Queue::handshake_monotime_sc, Queue::in_cipher, listen_cb(), ListenTask::listen_sock, Queue::listen_sock, ListenTask::listen_task, Queue::out_cipher, Queue::qh, Queue::read_task, Queue::rekey_monotime_get, Queue::rekey_monotime_sc, shutdown_running, Queue::sock, Queue::target, and Queue::write_task.

Referenced by get_queue_delete_it(), queue_read_kx(), queue_write(), and try_handle_plaintext().

{
  struct ListenTask *lt = NULL;
  struct GNUNET_HashCode h_sock;

  GNUNET_CRYPTO_hash (queue->listen_sock,
                      sizeof(queue->listen_sock),
                      &h_sock);

  lt =   GNUNET_CONTAINER_multihashmap_get (lt_map, &h_sock);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Disconnecting queue for peer `%s'\n",
              GNUNET_i2s (&queue->target));
  if (NULL != queue->rekey_monotime_sc)
  {
    GNUNET_PEERSTORE_store_cancel (queue->rekey_monotime_sc);
    queue->rekey_monotime_sc = NULL;
  }
  if (NULL != queue->handshake_monotime_sc)
  {
    GNUNET_PEERSTORE_store_cancel (queue->handshake_monotime_sc);
    queue->handshake_monotime_sc = NULL;
  }
  if (NULL != queue->handshake_ack_monotime_sc)
  {
    GNUNET_PEERSTORE_store_cancel (queue->handshake_ack_monotime_sc);
    queue->handshake_ack_monotime_sc = NULL;
  }
  if (NULL != queue->rekey_monotime_get)
  {
    GNUNET_PEERSTORE_iterate_cancel (queue->rekey_monotime_get);
    queue->rekey_monotime_get = NULL;
  }
  if (NULL != queue->handshake_monotime_get)
  {
    GNUNET_PEERSTORE_iterate_cancel (queue->handshake_monotime_get);
    queue->handshake_monotime_get = NULL;
  }
  if (NULL != queue->handshake_ack_monotime_get)
  {
    GNUNET_PEERSTORE_iterate_cancel (queue->handshake_ack_monotime_get);
    queue->handshake_ack_monotime_get = NULL;
  }
  if (NULL != queue->qh)
  {
    GNUNET_TRANSPORT_communicator_mq_del (queue->qh);
    queue->qh = NULL;
  }
  GNUNET_assert (
    GNUNET_YES ==
    GNUNET_CONTAINER_multipeermap_remove (queue_map, &queue->target, queue));
  GNUNET_STATISTICS_set (stats,
                         "# queues active",
                         GNUNET_CONTAINER_multipeermap_size (queue_map),
                         GNUNET_NO);
  if (NULL != queue->read_task)
  {
    GNUNET_SCHEDULER_cancel (queue->read_task);
    queue->read_task = NULL;
  }
  if (NULL != queue->write_task)
  {
    GNUNET_SCHEDULER_cancel (queue->write_task);
    queue->write_task = NULL;
  }
  if (GNUNET_SYSERR == GNUNET_NETWORK_socket_close (queue->sock))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "closing socket failed\n");
  }
  gcry_cipher_close (queue->in_cipher);
  gcry_cipher_close (queue->out_cipher);
  GNUNET_free (queue->address);
  if (0 != queue->backpressure)
    queue->destroyed = GNUNET_YES;
  else
    GNUNET_free (queue);

  if (NULL == lt)
    return;

  if ((! shutdown_running) && (NULL == lt->listen_task))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "add read net listen\n");
    lt->listen_task = GNUNET_SCHEDULER_add_read_net (
      GNUNET_TIME_UNIT_FOREVER_REL,
      lt->listen_sock,
      &listen_cb,
      lt);
  }
  else
    GNUNET_free (lt);
}

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calculate_hmac()

static void calculate_hmac ( struct GNUNET_HashCode *  hmac_secret, const void *  buf, size_t  buf_size, struct GNUNET_ShortHashCode *  smac  )

static

Compute mac over buf, and ratched the hmac_secret.

Parameters

[in,out]	hmac_secret	secret for HMAC calculation
	buf	buffer to MAC
	buf_size	number of bytes in buf
	smac[out]	where to write the HMAC

Definition at line 982 of file gnunet-communicator-tcp.c.

References GNUNET_CRYPTO_hash(), and GNUNET_CRYPTO_hmac_raw().

Referenced by inject_rekey(), mq_send(), queue_finish(), and try_handle_plaintext().

{
  struct GNUNET_HashCode mac;

  GNUNET_CRYPTO_hmac_raw (hmac_secret,
                          sizeof(struct GNUNET_HashCode),
                          buf,
                          buf_size,
                          &mac);
  /* truncate to `struct GNUNET_ShortHashCode` */
  memcpy (smac, &mac, sizeof(struct GNUNET_ShortHashCode));
  /* ratchet hmac key */
  GNUNET_CRYPTO_hash (hmac_secret,
                      sizeof(struct GNUNET_HashCode),
                      hmac_secret);
}

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queue_finish()

static void queue_finish ( struct Queue *  queue )

static

Append a 'finish' message to the outgoing transmission.

Once the finish has been transmitted, destroy the queue.

Parameters

queue

queue to shut down nicely

Definition at line 1010 of file gnunet-communicator-tcp.c.

References calculate_hmac(), Queue::finishing, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH, GNUNET_YES, TCPFinish::header, TCPFinish::hmac, Queue::out_hmac, Queue::pwrite_buf, Queue::pwrite_off, GNUNET_MessageHeader::size, and GNUNET_MessageHeader::type.

Referenced by do_rekey(), handshake_ack_monotime_cb(), handshake_monotime_cb(), mq_destroy(), mq_error(), queue_read(), rekey_monotime_cb(), and try_handle_plaintext().

{
  struct TCPFinish fin;

  memset (&fin, 0, sizeof(fin));
  fin.header.size = htons (sizeof(fin));
  fin.header.type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH);
  calculate_hmac (&queue->out_hmac, &fin, sizeof(fin), &fin.hmac);
  /* if there is any message left in pwrite_buf, we
     overwrite it (possibly dropping the last message
     from CORE hard here) */
  memcpy (queue->pwrite_buf, &fin, sizeof(fin));
  queue->pwrite_off = sizeof(fin);
  /* This flag will ensure that #queue_write() no longer
     notifies CORE about the possibility of sending
     more data, and that #queue_write() will call
  #queue_destroy() once the @c fin was fully written. */
  queue->finishing = GNUNET_YES;
}

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reschedule_queue_timeout()

static void reschedule_queue_timeout ( struct Queue *  queue )

static

Increment queue timeout due to activity.

We do not immediately notify the monitor here as that might generate excessive signalling.

Parameters

queue

queue for which the timeout should be rescheduled

Definition at line 1039 of file gnunet-communicator-tcp.c.

References GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_TIME_relative_to_absolute(), queue_read(), and Queue::timeout.

Referenced by core_read_finished_cb(), queue_read(), queue_read_kx(), and queue_write().

{
  queue->timeout =
    GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
}

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queue_read()

static void queue_read ( void *  cls )

static

Queue read task.

If we hit the timeout, disconnect it

Parameters

cls	the struct Queue * to disconnect

Definition at line 1888 of file gnunet-communicator-tcp.c.

References Queue::backpressure, BUF_SIZE, Queue::cread_buf, Queue::cread_off, done(), GNUNET_assert, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_log_strerror, GNUNET_MIN, GNUNET_NETWORK_socket_recv(), GNUNET_NO, GNUNET_SCHEDULER_add_read_net(), GNUNET_STRINGS_relative_time_to_string(), GNUNET_TIME_absolute_get_remaining(), GNUNET_YES, Queue::in_cipher, max, max_queue_length, Queue::pread_buf, Queue::pread_off, queue(), queue_finish(), Queue::read_task, Queue::rekeyed, GNUNET_TIME_Relative::rel_value_us, reschedule_queue_timeout(), Queue::sock, Queue::timeout, and try_handle_plaintext().

Referenced by core_read_finished_cb(), proto_read_kx(), queue_read_kx(), and reschedule_queue_timeout().

{
  struct Queue *queue = cls;
  struct GNUNET_TIME_Relative left;
  ssize_t rcvd;

  queue->read_task = NULL;
  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
                                     &queue->cread_buf[queue->cread_off],
                                     BUF_SIZE - queue->cread_off);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received %lu bytes from TCP queue\n", rcvd);
  if (-1 == rcvd)
  {
    if ((EAGAIN != errno) && (EINTR != errno))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "recv");
      queue_finish (queue);
      return;
    }
    /* try again */
    left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
    queue->read_task =
      GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read, queue);
    return;
  }
  if (0 != rcvd)
    reschedule_queue_timeout (queue);
  queue->cread_off += rcvd;
  while ((queue->pread_off < sizeof(queue->pread_buf)) &&
         (queue->cread_off > 0))
  {
    size_t max = GNUNET_MIN (sizeof(queue->pread_buf) - queue->pread_off,
                             queue->cread_off);
    size_t done;
    size_t total;
    size_t old_pread_off = queue->pread_off;

    GNUNET_assert (0 ==
                   gcry_cipher_decrypt (queue->in_cipher,
                                        &queue->pread_buf[queue->pread_off],
                                        max,
                                        queue->cread_buf,
                                        max));
    queue->pread_off += max;
    total = 0;
    while (0 != (done = try_handle_plaintext (queue)))
    {
      /* 'done' bytes of plaintext were used, shift buffer */
      GNUNET_assert (done <= queue->pread_off);
      /* NOTE: this memmove() could possibly sometimes be
         avoided if we pass 'total' into try_handle_plaintext()
         and use it at an offset into the buffer there! */
      memmove (queue->pread_buf,
               &queue->pread_buf[done],
               queue->pread_off - done);
      queue->pread_off -= done;
      total += done;
      /* The last plaintext was a rekey, abort for now */
      if (GNUNET_YES == queue->rekeyed)
        break;
    }
    /* when we encounter a rekey message, the decryption above uses the
       wrong key for everything after the rekey; in that case, we have
       to re-do the decryption at 'total' instead of at 'max'.
       However, we have to take into account that the plaintext buffer may have
       already contained data and not jumpt too far ahead in the ciphertext.
       If there is no rekey and the last message is incomplete (max > total),
       it is safe to keep the decryption so we shift by 'max' */
    if (GNUNET_YES == queue->rekeyed)
    {
      max = total - old_pread_off;
      queue->rekeyed = GNUNET_NO;
      queue->pread_off = 0;
    }
    memmove (queue->cread_buf, &queue->cread_buf[max], queue->cread_off - max);
    queue->cread_off -= max;
  }
  if (BUF_SIZE == queue->cread_off)
    return; /* buffer full, suspend reading */
  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
  if (0 != left.rel_value_us)
  {
    if (max_queue_length > queue->backpressure)
    {
      /* continue reading */
      left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
      queue->read_task =
        GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read, queue);
    }
    return;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Queue %p was idle for %s, disconnecting\n",
              queue,
              GNUNET_STRINGS_relative_time_to_string (
                GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
                GNUNET_YES));
  queue_finish (queue);
}

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core_read_finished_cb()

static void core_read_finished_cb ( void *  cls, int  success  )

static

Core tells us it is done processing a message that transport received on a queue with status success.

Parameters

cls	a struct Queue * where the message originally came from
success	GNUNET_OK on success

Definition at line 1063 of file gnunet-communicator-tcp.c.

References Queue::backpressure, Queue::destroyed, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_STATISTICS_update(), GNUNET_TIME_absolute_get_remaining(), GNUNET_YES, queue(), queue_read(), Queue::read_task, reschedule_queue_timeout(), Queue::sock, and Queue::timeout.

Referenced by pass_plaintext_to_core().

{
  struct Queue *queue = cls;
  if (GNUNET_OK != success)
    GNUNET_STATISTICS_update (stats,
                              "# messages lost in communicator API towards CORE",
                              1,
                              GNUNET_NO);
  if (NULL == queue)
    return;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "backpressure %u\n",
              queue->backpressure);

  queue->backpressure--;
  /* handle deferred queue destruction */
  if ((queue->destroyed) && (0 == queue->backpressure))
  {
    GNUNET_free (queue);
    return;
  }
  else if (GNUNET_YES != queue->destroyed)
  {
    reschedule_queue_timeout (queue);
    /* possibly unchoke reading, now that CORE made progress */
    if (NULL == queue->read_task)
      queue->read_task =
        GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_absolute_get_remaining (
                                         queue->timeout),
                                       queue->sock,
                                       &queue_read,
                                       queue);
  }
}

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pass_plaintext_to_core()

static void pass_plaintext_to_core ( struct Queue *  queue, const void *  plaintext, size_t  plaintext_len  )

static

We received plaintext_len bytes of plaintext on queue.

Pass it on to CORE. If transmission is actually happening, increase backpressure counter.

Parameters

queue	the queue that received the plaintext
plaintext	the plaintext that was received
plaintext_len	number of bytes of plaintext received

Definition at line 1110 of file gnunet-communicator-tcp.c.

References ADDRESS_VALIDITY_PERIOD, Queue::backpressure, core_read_finished_cb(), GNUNET_break, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_TRANSPORT_communicator_receive(), ret, GNUNET_MessageHeader::size, and Queue::target.

Referenced by try_handle_plaintext().

{
  const struct GNUNET_MessageHeader *hdr = plaintext;
  int ret;

  if (ntohs (hdr->size) != plaintext_len)
  {
    /* NOTE: If we ever allow multiple CORE messages in one
       BOX, this will have to change! */
    GNUNET_break (0);
    return;
  }
  ret = GNUNET_TRANSPORT_communicator_receive (ch,
                                               &queue->target,
                                               hdr,
                                               ADDRESS_VALIDITY_PERIOD,
                                               &core_read_finished_cb,
                                               queue);
  if (GNUNET_OK == ret)
    queue->backpressure++;
  GNUNET_break (GNUNET_NO != ret);  /* backpressure not working!? */
  if (GNUNET_SYSERR == ret)
    GNUNET_STATISTICS_update (stats,
                              "# bytes lost due to CORE not running",
                              plaintext_len,
                              GNUNET_NO);
}

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setup_cipher()

static void setup_cipher ( const struct GNUNET_HashCode *  dh, const struct GNUNET_PeerIdentity *  pid, gcry_cipher_hd_t *  cipher, struct GNUNET_HashCode *  hmac_key  )

static

Setup cipher based on shared secret dh and decrypting peer pid.

Parameters

dh	shared secret
pid	decrypting peer's identity
cipher[out]	cipher to initialize
hmac_key[out]	HMAC key to initialize

Definition at line 1151 of file gnunet-communicator-tcp.c.

References GNUNET_assert, GNUNET_CRYPTO_kdf(), GNUNET_YES, and key.

Referenced by setup_in_cipher(), and setup_out_cipher().

{
  char key[256 / 8];
  char ctr[128 / 8];

  gcry_cipher_open (cipher,
                    GCRY_CIPHER_AES256 /* low level: go for speed */,
                    GCRY_CIPHER_MODE_CTR,
                    0 /* flags */);
  GNUNET_assert (GNUNET_YES == GNUNET_CRYPTO_kdf (key,
                                                  sizeof(key),
                                                  "TCP-key",
                                                  strlen ("TCP-key"),
                                                  dh,
                                                  sizeof(*dh),
                                                  pid,
                                                  sizeof(*pid),
                                                  NULL,
                                                  0));
  gcry_cipher_setkey (*cipher, key, sizeof(key));
  GNUNET_assert (GNUNET_YES == GNUNET_CRYPTO_kdf (ctr,
                                                  sizeof(ctr),
                                                  "TCP-ctr",
                                                  strlen ("TCP-ctr"),
                                                  dh,
                                                  sizeof(*dh),
                                                  pid,
                                                  sizeof(*pid),
                                                  NULL,
                                                  0));
  gcry_cipher_setctr (*cipher, ctr, sizeof(ctr));
  GNUNET_assert (GNUNET_YES ==
                 GNUNET_CRYPTO_kdf (hmac_key,
                                    sizeof(struct GNUNET_HashCode),
                                    "TCP-hmac",
                                    strlen ("TCP-hmac"),
                                    dh,
                                    sizeof(*dh),
                                    pid,
                                    sizeof(*pid),
                                    NULL,
                                    0));
}

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rekey_monotime_store_cb()

static void rekey_monotime_store_cb ( void *  cls, int  success  )

static

Callback called when peerstore store operation for rekey monotime value is finished.

Parameters

cls	Queue context the store operation was executed.
success	Store operation was successful (GNUNET_OK) or not.

Definition at line 1205 of file gnunet-communicator-tcp.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, queue(), and Queue::rekey_monotime_sc.

Referenced by rekey_monotime_cb().

{
  struct Queue *queue = cls;
  if (GNUNET_OK != success)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to store rekey monotonic time in PEERSTORE!\n");
  }
  queue->rekey_monotime_sc = NULL;
}

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rekey_monotime_cb()

static void rekey_monotime_cb ( void *  cls, const struct GNUNET_PEERSTORE_Record *  record, const char *  emsg  )

static

Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY where found.

Parameters

cls	Queue context the store operation was executed.
record	The record found or NULL if there is no record left.
emsg	Message from peerstore.

Definition at line 1225 of file gnunet-communicator-tcp.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, GNUNET_PEERSTORE_store(), GNUNET_PEERSTORE_STOREOPTION_REPLACE, GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY, GNUNET_TIME_absolute_ntoh(), GNUNET_TIME_UNIT_FOREVER_ABS, pid, queue(), queue_finish(), Queue::rekey_monotime_get, Queue::rekey_monotime_sc, rekey_monotime_store_cb(), Queue::rekey_monotonic_time, Queue::target, GNUNET_PEERSTORE_Record::value, and GNUNET_PEERSTORE_Record::value_size.

Referenced by do_rekey().

{
  struct Queue *queue = cls;
  struct GNUNET_TIME_AbsoluteNBO *mtbe;
  struct GNUNET_TIME_Absolute mt;
  const struct GNUNET_PeerIdentity *pid;
  struct GNUNET_TIME_AbsoluteNBO *rekey_monotonic_time;

  (void) emsg;

  rekey_monotonic_time = &queue->rekey_monotonic_time;
  pid = &queue->target;
  if (NULL == record)
  {
    queue->rekey_monotime_get = NULL;
    return;
  }
  if (sizeof(*mtbe) != record->value_size)
  {
    GNUNET_break (0);
    return;
  }
  mtbe = record->value;
  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
        queue->rekey_monotonic_time).abs_value_us)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Queue from %s dropped, rekey monotime in the past\n",
                GNUNET_i2s (&queue->target));
    GNUNET_break (0);
    queue_finish (queue);
    return;
  }
  queue->rekey_monotime_sc = GNUNET_PEERSTORE_store (peerstore,
                                                     "transport_tcp_communicator",
                                                     pid,
                                                     GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY,
                                                     rekey_monotonic_time,
                                                     sizeof(rekey_monotonic_time),
                                                     GNUNET_TIME_UNIT_FOREVER_ABS,
                                                     GNUNET_PEERSTORE_STOREOPTION_REPLACE,
                                                     &rekey_monotime_store_cb,
                                                     queue);
}

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setup_in_cipher()

static void setup_in_cipher ( const struct GNUNET_CRYPTO_EcdhePublicKey *  ephemeral, struct Queue *  queue  )

static

Setup cipher of queue for decryption.

Parameters

ephemeral	ephemeral key we received from the other peer
queue[in,out]	queue to initialize decryption cipher for

Definition at line 1281 of file gnunet-communicator-tcp.c.

References GNUNET_CRYPTO_eddsa_ecdh(), Queue::in_cipher, Queue::in_hmac, my_identity, and setup_cipher().

Referenced by do_rekey(), proto_read_kx(), and queue_read_kx().

{
  struct GNUNET_HashCode dh;

  GNUNET_CRYPTO_eddsa_ecdh (my_private_key, ephemeral, &dh);
  setup_cipher (&dh, &my_identity, &queue->in_cipher, &queue->in_hmac);
}

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do_rekey()

static void do_rekey ( struct Queue *  queue, const struct TCPRekey *  rekey  )

static

Handle rekey message on queue.

The message was already HMAC'ed, but we should additionally still check the signature. Then we need to stop the old cipher and start afresh.

Parameters

queue	the queue rekey was received on
rekey	the rekey message

Definition at line 1300 of file gnunet-communicator-tcp.c.

References TcpRekeySignature::ephemeral, TCPRekey::ephemeral, GNUNET_assert, GNUNET_break, GNUNET_CRYPTO_eddsa_verify, GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_OK, GNUNET_p2s(), GNUNET_PEERSTORE_iterate(), GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY, GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY, GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TIME_absolute_ntoh(), GNUNET_YES, Queue::in_cipher, TcpRekeySignature::monotonic_time, TCPRekey::monotonic_time, my_identity, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpRekeySignature::purpose, TcpHandshakeSignature::purpose, queue_finish(), TcpRekeySignature::receiver, rekey_monotime_cb(), Queue::rekey_monotime_get, Queue::rekey_monotonic_time, Queue::rekeyed, TcpRekeySignature::sender, TCPRekey::sender_sig, setup_in_cipher(), GNUNET_CRYPTO_EccSignaturePurpose::size, and Queue::target.

Referenced by try_handle_plaintext().

{
  struct TcpRekeySignature thp;

  thp.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY);
  thp.purpose.size = htonl (sizeof(thp));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "do_rekey size %u\n",
              thp.purpose.size);
  thp.sender = queue->target;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "sender %s\n",
              GNUNET_p2s (&thp.sender.public_key));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "sender %s\n",
              GNUNET_p2s (&queue->target.public_key));
  thp.receiver = my_identity;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "receiver %s\n",
              GNUNET_p2s (&thp.receiver.public_key));
  thp.ephemeral = rekey->ephemeral;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "ephemeral %s\n",
              GNUNET_e2s (&thp.ephemeral));
  thp.monotonic_time = rekey->monotonic_time;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "time %s\n",
              GNUNET_STRINGS_absolute_time_to_string (
                GNUNET_TIME_absolute_ntoh (thp.monotonic_time)));
  GNUNET_assert (ntohl ((&thp)->purpose.size) == sizeof (*(&thp)));
  if (GNUNET_OK !=
      GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY,
                                  &thp,
                                  &rekey->sender_sig,
                                  &queue->target.public_key))
  {
    GNUNET_break (0);
    queue_finish (queue);
    return;
  }
  queue->rekey_monotonic_time = rekey->monotonic_time;
  queue->rekey_monotime_get = GNUNET_PEERSTORE_iterate (peerstore,
                                                        "transport_tcp_communicator",
                                                        &queue->target,
                                                        GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY,
                                                        &rekey_monotime_cb,
                                                        queue);
  gcry_cipher_close (queue->in_cipher);
  queue->rekeyed = GNUNET_YES;
  setup_in_cipher (&rekey->ephemeral, queue);
}

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handshake_ack_monotime_store_cb()

static void handshake_ack_monotime_store_cb ( void *  cls, int  success  )

static

Callback called when peerstore store operation for handshake ack monotime value is finished.

Parameters

cls	Queue context the store operation was executed.
success	Store operation was successful (GNUNET_OK) or not.

Definition at line 1359 of file gnunet-communicator-tcp.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, Queue::handshake_ack_monotime_sc, and queue().

Referenced by handshake_ack_monotime_cb().

{
  struct Queue *queue = cls;

  if (GNUNET_OK != success)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to store handshake ack monotonic time in PEERSTORE!\n");
  }
  queue->handshake_ack_monotime_sc = NULL;
}

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handshake_ack_monotime_cb()

static void handshake_ack_monotime_cb ( void *  cls, const struct GNUNET_PEERSTORE_Record *  record, const char *  emsg  )

static

Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK where found.

Parameters

cls	Queue context the store operation was executed.
record	The record found or NULL if there is no record left.
emsg	Message from peerstore.

Definition at line 1380 of file gnunet-communicator-tcp.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, GNUNET_PEERSTORE_store(), GNUNET_PEERSTORE_STOREOPTION_REPLACE, GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK, GNUNET_TIME_absolute_ntoh(), GNUNET_TIME_UNIT_FOREVER_ABS, Queue::handshake_ack_monotime_get, Queue::handshake_ack_monotime_sc, handshake_ack_monotime_store_cb(), Queue::handshake_ack_monotonic_time, pid, queue(), queue_finish(), Queue::target, GNUNET_PEERSTORE_Record::value, and GNUNET_PEERSTORE_Record::value_size.

Referenced by try_handle_plaintext().

{
  struct Queue *queue = cls;
  struct GNUNET_TIME_AbsoluteNBO *mtbe;
  struct GNUNET_TIME_Absolute mt;
  const struct GNUNET_PeerIdentity *pid;
  struct GNUNET_TIME_AbsoluteNBO *handshake_ack_monotonic_time;

  (void) emsg;

  handshake_ack_monotonic_time = &queue->handshake_ack_monotonic_time;
  pid = &queue->target;
  if (NULL == record)
  {
    queue->handshake_ack_monotime_get = NULL;
    return;
  }
  if (sizeof(*mtbe) != record->value_size)
  {
    GNUNET_break (0);
    return;
  }
  mtbe = record->value;
  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
        queue->handshake_ack_monotonic_time).abs_value_us)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Queue from %s dropped, handshake ack monotime in the past\n",
                GNUNET_i2s (&queue->target));
    GNUNET_break (0);
    queue_finish (queue);
    return;
  }
  queue->handshake_ack_monotime_sc = GNUNET_PEERSTORE_store (peerstore,
                                                             "transport_tcp_communicator",
                                                             pid,
                                                             GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK,
                                                             handshake_ack_monotonic_time,
                                                             sizeof(
                                                               handshake_ack_monotonic_time),
                                                             GNUNET_TIME_UNIT_FOREVER_ABS,
                                                             GNUNET_PEERSTORE_STOREOPTION_REPLACE,
                                                             &
                                                             handshake_ack_monotime_store_cb,
                                                             queue);
}

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send_challenge()

static void send_challenge ( struct ChallengeNonceP  challenge, struct Queue *  queue  )

static

Sending challenge with TcpConfirmationAck back to sender of ephemeral key.

Parameters

tc	The TCPConfirmation originally send.
queue	The queue context.

Definition at line 1438 of file gnunet-communicator-tcp.c.

References TCPConfirmationAck::challenge, TcpHandshakeSignature::challenge, TcpHandshakeAckSignature::challenge, Queue::cwrite_buf, Queue::cwrite_off, GNUNET_assert, GNUNET_CRYPTO_eddsa_sign, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log_from_nocheck(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK, GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE_ACK, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), TCPConfirmationAck::header, TcpHandshakeAckSignature::monotonic_time, TCPConfirmationAck::monotonic_time, my_identity, Queue::out_cipher, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeAckSignature::purpose, TcpHandshakeAckSignature::receiver, TCPConfirmationAck::sender, TcpHandshakeAckSignature::sender, TCPConfirmationAck::sender_sig, GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_MessageHeader::size, Queue::target, and GNUNET_MessageHeader::type.

Referenced by queue_read_kx(), and try_handle_plaintext().

{
  struct TCPConfirmationAck tca;
  struct TcpHandshakeAckSignature thas;

  GNUNET_log_from_nocheck (GNUNET_ERROR_TYPE_DEBUG,
                           "transport",
                           "sending challenge\n");

  tca.header.type = ntohs (
    GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK);
  tca.header.size = ntohs (sizeof(tca));
  tca.challenge = challenge;
  tca.sender = my_identity;
  tca.monotonic_time =
    GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get_monotonic (cfg));
  thas.purpose.purpose = htonl (
    GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE_ACK);
  thas.purpose.size = htonl (sizeof(thas));
  thas.sender = my_identity;
  thas.receiver = queue->target;
  thas.monotonic_time = tca.monotonic_time;
  thas.challenge = tca.challenge;
  GNUNET_CRYPTO_eddsa_sign (my_private_key,
                            &thas,
                            &tca.sender_sig);
  GNUNET_assert (0 ==
                 gcry_cipher_encrypt (queue->out_cipher,
                                      &queue->cwrite_buf[queue->cwrite_off],
                                      sizeof(tca),
                                      &tca,
                                      sizeof(tca)));
  queue->cwrite_off += sizeof(tca);
  GNUNET_log_from_nocheck (GNUNET_ERROR_TYPE_DEBUG,
                           "transport",
                           "sending challenge done\n");
}

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setup_out_cipher()

static void setup_out_cipher ( struct Queue *  queue )

static

Setup cipher for outgoing data stream based on target and our ephemeral private key.

Parameters

queue

queue to setup outgoing (encryption) cipher for

Definition at line 1484 of file gnunet-communicator-tcp.c.

References Queue::ephemeral, GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u64(), GNUNET_TIME_relative_to_absolute(), Queue::out_cipher, Queue::out_hmac, GNUNET_PeerIdentity::public_key, rekey_interval, Queue::rekey_left_bytes, REKEY_MAX_BYTES, Queue::rekey_time, setup_cipher(), and Queue::target.

Referenced by inject_rekey(), and start_initial_kx_out().

{
  struct GNUNET_HashCode dh;

  GNUNET_CRYPTO_ecdh_eddsa (&queue->ephemeral, &queue->target.public_key, &dh);
  /* we don't need the private key anymore, drop it! */
  memset (&queue->ephemeral, 0, sizeof(queue->ephemeral));
  setup_cipher (&dh, &queue->target, &queue->out_cipher, &queue->out_hmac);
  queue->rekey_time = GNUNET_TIME_relative_to_absolute (rekey_interval);
  queue->rekey_left_bytes =
    GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, REKEY_MAX_BYTES);
}

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inject_rekey()

static void inject_rekey ( struct Queue *  queue )

static

Inject a struct TCPRekey message into the queue's plaintext buffer.

Parameters

queue

queue to perform rekeying on

Definition at line 1505 of file gnunet-communicator-tcp.c.

References calculate_hmac(), Queue::cwrite_buf, Queue::cwrite_off, Queue::ephemeral, TCPRekey::ephemeral, TcpRekeySignature::ephemeral, GNUNET_assert, GNUNET_CRYPTO_ecdhe_key_create(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_eddsa_sign, GNUNET_e2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY, GNUNET_p2s(), GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY, GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), GNUNET_TIME_absolute_ntoh(), TCPRekey::header, TCPRekey::hmac, TCPRekey::monotonic_time, TcpRekeySignature::monotonic_time, my_identity, Queue::out_cipher, Queue::out_hmac, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpRekeySignature::purpose, Queue::pwrite_off, TcpRekeySignature::receiver, TcpRekeySignature::sender, TCPRekey::sender_sig, setup_out_cipher(), GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_MessageHeader::size, Queue::target, and GNUNET_MessageHeader::type.

Referenced by queue_write().

{
  struct TCPRekey rekey;
  struct TcpRekeySignature thp;

  GNUNET_assert (0 == queue->pwrite_off);
  memset (&rekey, 0, sizeof(rekey));
  GNUNET_CRYPTO_ecdhe_key_create (&queue->ephemeral);
  rekey.header.type = ntohs (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY);
  rekey.header.size = ntohs (sizeof(rekey));
  GNUNET_CRYPTO_ecdhe_key_get_public (&queue->ephemeral, &rekey.ephemeral);
  rekey.monotonic_time =
    GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get_monotonic (cfg));
  thp.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY);
  thp.purpose.size = htonl (sizeof(thp));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "inject_rekey size %u\n",
              thp.purpose.size);
  thp.sender = my_identity;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "sender %s\n",
              GNUNET_p2s (&thp.sender.public_key));
  thp.receiver = queue->target;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "receiver %s\n",
              GNUNET_p2s (&thp.receiver.public_key));
  thp.ephemeral = rekey.ephemeral;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "ephemeral %s\n",
              GNUNET_e2s (&thp.ephemeral));
  thp.monotonic_time = rekey.monotonic_time;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "time %s\n",
              GNUNET_STRINGS_absolute_time_to_string (
                GNUNET_TIME_absolute_ntoh (thp.monotonic_time)));
  GNUNET_CRYPTO_eddsa_sign (my_private_key,
                            &thp,
                            &rekey.sender_sig);
  calculate_hmac (&queue->out_hmac, &rekey, sizeof(rekey), &rekey.hmac);
  /* Encrypt rekey message with 'old' cipher */
  GNUNET_assert (0 ==
                 gcry_cipher_encrypt (queue->out_cipher,
                                      &queue->cwrite_buf[queue->cwrite_off],
                                      sizeof(rekey),
                                      &rekey,
                                      sizeof(rekey)));
  queue->cwrite_off += sizeof(rekey);
  /* Setup new cipher for successive messages */
  gcry_cipher_close (queue->out_cipher);
  setup_out_cipher (queue);
}

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queue_write()

static void queue_write ( void *  cls )

static

We have been notified that our socket is ready to write.

Then reschedule this function to be called again once more is available.

Parameters

cls	a struct Queue

Definition at line 1565 of file gnunet-communicator-tcp.c.

References BUF_SIZE, Queue::cwrite_buf, Queue::cwrite_off, Queue::finishing, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_MQ_impl_send_continue(), GNUNET_NETWORK_socket_send(), GNUNET_NO, GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, inject_rekey(), Queue::mq, Queue::mq_awaits_continue, Queue::out_cipher, Queue::pwrite_buf, Queue::pwrite_off, queue(), queue_destroy(), Queue::rekey_left_bytes, Queue::rekey_time, GNUNET_TIME_Relative::rel_value_us, reschedule_queue_timeout(), Queue::sock, and Queue::write_task.

Referenced by mq_init(), mq_send(), proto_read_kx(), queue_read_kx(), and try_handle_plaintext().

{
  struct Queue *queue = cls;
  ssize_t sent;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "In queue write\n");
  queue->write_task = NULL;
  if (0 != queue->cwrite_off)
  {
    sent = GNUNET_NETWORK_socket_send (queue->sock,
                                       queue->cwrite_buf,
                                       queue->cwrite_off);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Sent %lu bytes to TCP queue\n", sent);
    if ((-1 == sent) && (EAGAIN != errno) && (EINTR != errno))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "send");
      queue_destroy (queue);
      return;
    }
    if (sent > 0)
    {
      size_t usent = (size_t) sent;
      queue->cwrite_off -= usent;
      memmove (queue->cwrite_buf,
               &queue->cwrite_buf[usent],
               queue->cwrite_off);
      reschedule_queue_timeout (queue);
    }
  }
  /* can we encrypt more? (always encrypt full messages, needed
     such that #mq_cancel() can work!) */
  if ((0 < queue->rekey_left_bytes) &&
      (queue->pwrite_off > 0) &&
      (queue->cwrite_off + queue->pwrite_off <= BUF_SIZE))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Encrypting %lu bytes\n", queue->pwrite_off);
    GNUNET_assert (0 ==
                   gcry_cipher_encrypt (queue->out_cipher,
                                        &queue->cwrite_buf[queue->cwrite_off],
                                        queue->pwrite_off,
                                        queue->pwrite_buf,
                                        queue->pwrite_off));
    if (queue->rekey_left_bytes > queue->pwrite_off)
      queue->rekey_left_bytes -= queue->pwrite_off;
    else
      queue->rekey_left_bytes = 0;
    queue->cwrite_off += queue->pwrite_off;
    queue->pwrite_off = 0;
  }
  // if ((-1 != unverified_size)&& ((0 == queue->pwrite_off) &&
  if (((0 == queue->pwrite_off) &&
       ((0 == queue->rekey_left_bytes) ||
        (0 ==
         GNUNET_TIME_absolute_get_remaining (
           queue->rekey_time).rel_value_us))))
  {
    inject_rekey (queue);
  }
  if ((0 == queue->pwrite_off) && (! queue->finishing) &&
      (GNUNET_YES == queue->mq_awaits_continue))
  {
    queue->mq_awaits_continue = GNUNET_NO;
    GNUNET_MQ_impl_send_continue (queue->mq);
  }
  /* did we just finish writing 'finish'? */
  if ((0 == queue->cwrite_off) && (GNUNET_YES == queue->finishing))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Finishing queue\n");
    queue_destroy (queue);
    return;
  }
  /* do we care to write more? */
  if ((0 < queue->cwrite_off) || (0 < queue->pwrite_off))
    queue->write_task =
      GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                      queue->sock,
                                      &queue_write,
                                      queue);
}

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try_handle_plaintext()

static size_t try_handle_plaintext ( struct Queue *  queue )

static

Test if we have received a full message in plaintext.

If so, handle it.

Parameters

queue

queue to process inbound plaintext for

Returns

number of bytes of plaintext handled, 0 for none

Definition at line 1656 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::address_len, calculate_hmac(), Queue::challenge, Queue::challenge_received, COMMUNICATOR_ADDRESS_PREFIX, Queue::cs, do_rekey(), GNUNET_a2s(), GNUNET_asprintf(), GNUNET_assert, GNUNET_break, GNUNET_break_op, GNUNET_CRYPTO_eddsa_verify, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_memcmp, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY, GNUNET_PEERSTORE_iterate(), GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK, GNUNET_SCHEDULER_add_write_net(), GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE_ACK, GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_communicator_mq_add(), GNUNET_TRANSPORT_CS_INBOUND, GNUNET_TRANSPORT_QUEUE_LENGTH_UNLIMITED, handshake_ack_monotime_cb(), Queue::handshake_ack_monotime_get, TCPBox::hmac, TCPFinish::hmac, Queue::in_hmac, INITIAL_CORE_KX_SIZE, Queue::mq, my_identity, Queue::nt, pass_plaintext_to_core(), Queue::pread_buf, Queue::pread_off, Queue::qh, queue_destroy(), queue_finish(), queue_write(), send_challenge(), size, GNUNET_MessageHeader::size, Queue::sock, Queue::target, type, GNUNET_MessageHeader::type, unverified_size, and Queue::write_task.

Referenced by queue_read().

{
  const struct GNUNET_MessageHeader *hdr =
    (const struct GNUNET_MessageHeader *) queue->pread_buf;
  const struct TCPConfirmationAck *tca = (const struct
                                          TCPConfirmationAck *) queue->pread_buf;
  const struct TCPBox *box = (const struct TCPBox *) queue->pread_buf;
  const struct TCPRekey *rekey = (const struct TCPRekey *) queue->pread_buf;
  const struct TCPFinish *fin = (const struct TCPFinish *) queue->pread_buf;
  struct TCPRekey rekeyz;
  struct TCPFinish finz;
  struct GNUNET_ShortHashCode tmac;
  uint16_t type;
  size_t size = 0; /* make compiler happy */
  struct TcpHandshakeAckSignature thas;
  const struct ChallengeNonceP challenge = queue->challenge;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "try handle plaintext!\n");

  if ((sizeof(*hdr) > queue->pread_off))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, not even a header!\n");
    return 0; /* not even a header */
  }

  if ((-1 != unverified_size) && (unverified_size > INITIAL_CORE_KX_SIZE))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Already received data of size %lu bigger than KX size %lu!\n",
                unverified_size,
                INITIAL_CORE_KX_SIZE);
    GNUNET_break_op (0);
    queue_finish (queue);
    return 0;
  }

  type = ntohs (hdr->type);
  switch (type)
  {
  case GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK:
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "start processing ack\n");
    if (sizeof(*tca) > queue->pread_off)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Handling plaintext size of tca greater than pread offset.\n");
      return 0;
    }
    if (ntohs (hdr->size) != sizeof(*tca))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                  "Handling plaintext size does not match message type.\n");
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }

    thas.purpose.purpose = htonl (
      GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE_ACK);
    thas.purpose.size = htonl (sizeof(thas));
    thas.sender = tca->sender;
    thas.receiver = my_identity;
    thas.monotonic_time = tca->monotonic_time;
    thas.challenge = tca->challenge;

    if (GNUNET_SYSERR == GNUNET_CRYPTO_eddsa_verify (
          GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE_ACK,
          &thas,
          &tca->sender_sig,
          &tca->sender.public_key))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Verification of signature failed!\n");
      GNUNET_break (0);
      queue_finish (queue);
      return 0;
    }
    if (0 != GNUNET_memcmp (&tca->challenge, &challenge))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "Challenge in TCPConfirmationAck not correct!\n");
      GNUNET_break (0);
      queue_finish (queue);
      return 0;
    }

    queue->handshake_ack_monotime_get = GNUNET_PEERSTORE_iterate (peerstore,
                                                                  "transport_tcp_communicator",
                                                                  &queue->target,
                                                                  GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK,
                                                                  &
                                                                  handshake_ack_monotime_cb,
                                                                  queue);

    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, ack processed!\n");

    if (GNUNET_TRANSPORT_CS_INBOUND ==     queue->cs)
    {
      send_challenge (queue->challenge_received, queue);
      queue->write_task =
        GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                        queue->sock,
                                        &queue_write,
                                        queue);
    }

    unverified_size = -1;

    char *foreign_addr;

    switch (queue->address->sa_family)
    {
    case AF_INET:
      GNUNET_asprintf (&foreign_addr,
                       "%s-%s",
                       COMMUNICATOR_ADDRESS_PREFIX,
                       GNUNET_a2s (queue->address, queue->address_len));
      break;

    case AF_INET6:
      GNUNET_asprintf (&foreign_addr,
                       "%s-%s",
                       COMMUNICATOR_ADDRESS_PREFIX,
                       GNUNET_a2s (queue->address, queue->address_len));
      break;

    default:
      GNUNET_assert (0);
    }

    queue->qh = GNUNET_TRANSPORT_communicator_mq_add (ch,
                                                      &queue->target,
                                                      foreign_addr,
                                                      UINT32_MAX, /* no MTU */
                                                      GNUNET_TRANSPORT_QUEUE_LENGTH_UNLIMITED,
                                                      0, /* Priority */
                                                      queue->nt,
                                                      queue->cs,
                                                      queue->mq);

    GNUNET_free (foreign_addr);

    size = ntohs (hdr->size);
    break;
  case GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX:
    /* Special case: header size excludes box itself! */
    if (ntohs (hdr->size) + sizeof(struct TCPBox) > queue->pread_off)
      return 0;
    calculate_hmac (&queue->in_hmac, &box[1], ntohs (hdr->size), &tmac);
    if (0 != memcmp (&tmac, &box->hmac, sizeof(tmac)))
    {
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }
    pass_plaintext_to_core (queue, (const void *) &box[1], ntohs (hdr->size));
    size = ntohs (hdr->size) + sizeof(*box);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, box processed!\n");
    break;

  case GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY:
    if (sizeof(*rekey) > queue->pread_off)
      return 0;
    if (ntohs (hdr->size) != sizeof(*rekey))
    {
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }
    rekeyz = *rekey;
    memset (&rekeyz.hmac, 0, sizeof(rekeyz.hmac));
    calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
    if (0 != memcmp (&tmac, &rekey->hmac, sizeof(tmac)))
    {
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }
    do_rekey (queue, rekey);
    size = ntohs (hdr->size);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, rekey processed!\n");
    break;

  case GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH:
    if (sizeof(*fin) > queue->pread_off)
      return 0;
    if (ntohs (hdr->size) != sizeof(*fin))
    {
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }
    finz = *fin;
    memset (&finz.hmac, 0, sizeof(finz.hmac));
    calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
    if (0 != memcmp (&tmac, &fin->hmac, sizeof(tmac)))
    {
      GNUNET_break_op (0);
      queue_finish (queue);
      return 0;
    }
    /* handle FINISH by destroying queue */
    queue_destroy (queue);
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, finish processed!\n");
    break;

  default:
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Handling plaintext, nothing processed!\n");
    GNUNET_break_op (0);
    queue_finish (queue);
    return 0;
  }
  GNUNET_assert (0 != size);
  if (-1 != unverified_size)
    unverified_size += size;
  return size;
}

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tcp_address_to_sockaddr_numeric_v6()

static struct sockaddr* tcp_address_to_sockaddr_numeric_v6 ( socklen_t *  sock_len, struct sockaddr_in6  v6, unsigned int  port  )

static

Convert a struct sockaddr_in6 to astruct sockaddr *`.

Parameters

[out]	sock_len	set to the length of the address.
	v6	The sockaddr_in6 to be converted.

Returns

The struct sockaddr *.

Definition at line 1998 of file gnunet-communicator-tcp.c.

References GNUNET_memdup.

Referenced by init_socket_resolv(), run(), tcp_address_to_sockaddr(), and tcp_address_to_sockaddr_port_only().

{
  struct sockaddr *in;

  v6.sin6_family = AF_INET6;
  v6.sin6_port = htons ((uint16_t) port);
#if HAVE_SOCKADDR_IN_SIN_LEN
  v6.sin6_len = sizeof(sizeof(struct sockaddr_in6));
#endif
  v6.sin6_flowinfo = 0;
  v6.sin6_scope_id = 0;
  in = GNUNET_memdup (&v6, sizeof(v6));
  *sock_len = sizeof(struct sockaddr_in6);

  return in;
}

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tcp_address_to_sockaddr_numeric_v4()

static struct sockaddr* tcp_address_to_sockaddr_numeric_v4 ( socklen_t *  sock_len, struct sockaddr_in  v4, unsigned int  port  )

static

Convert a struct sockaddr_in4 to astruct sockaddr *`.

Parameters

[out]	sock_len	set to the length of the address.
	v4	The sockaddr_in4 to be converted.

Returns

The struct sockaddr *.

Definition at line 2025 of file gnunet-communicator-tcp.c.

References GNUNET_memdup.

Referenced by init_socket_resolv(), run(), tcp_address_to_sockaddr(), and tcp_address_to_sockaddr_port_only().

{
  struct sockaddr *in;

  v4.sin_family = AF_INET;
  v4.sin_port = htons ((uint16_t) port);
#if HAVE_SOCKADDR_IN_SIN_LEN
  v4.sin_len = sizeof(struct sockaddr_in);
#endif
  in = GNUNET_memdup (&v4, sizeof(v4));
  *sock_len = sizeof(struct sockaddr_in);
  return in;
}

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tcp_address_to_sockaddr_port_only()

static struct PortOnlyIpv4Ipv6* tcp_address_to_sockaddr_port_only ( const char *  bindto, unsigned int *  port  )

static

Convert TCP bind specification to a struct PortOnlyIpv4Ipv6 *

Parameters

bindto

bind specification to convert.

Returns

The converted bindto specification.

Definition at line 2048 of file gnunet-communicator-tcp.c.

References PortOnlyIpv4Ipv6::addr_ipv4, PortOnlyIpv4Ipv6::addr_ipv6, PortOnlyIpv4Ipv6::addr_len_ipv4, PortOnlyIpv4Ipv6::addr_len_ipv6, COMMUNICATOR_CONFIG_SECTION, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_NETWORK_test_pf(), GNUNET_new, GNUNET_NO, GNUNET_YES, tcp_address_to_sockaddr_numeric_v4(), and tcp_address_to_sockaddr_numeric_v6().

Referenced by run().

{
  struct PortOnlyIpv4Ipv6 *po;
  struct sockaddr_in *i4;
  struct sockaddr_in6 *i6;
  socklen_t sock_len_ipv4;
  socklen_t sock_len_ipv6;

  /* interpreting value as just a PORT number */
  if (*port > UINT16_MAX)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "BINDTO specification `%s' invalid: value too large for port\n",
                bindto);
    return NULL;
  }

  po = GNUNET_new (struct PortOnlyIpv4Ipv6);

  if ((GNUNET_NO == GNUNET_NETWORK_test_pf (PF_INET6)) ||
      (GNUNET_YES ==
       GNUNET_CONFIGURATION_get_value_yesno (cfg,
                                             COMMUNICATOR_CONFIG_SECTION,
                                             "DISABLE_V6")))
  {
    i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
    po->addr_ipv4 = tcp_address_to_sockaddr_numeric_v4 (&sock_len_ipv4, *i4,
                                                        *port);
    po->addr_len_ipv4 = sock_len_ipv4;
  }
  else
  {

    i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
    po->addr_ipv4 = tcp_address_to_sockaddr_numeric_v4 (&sock_len_ipv4, *i4,
                                                        *port);
    po->addr_len_ipv4 = sock_len_ipv4;

    i6 = GNUNET_malloc (sizeof(struct sockaddr_in6));
    po->addr_ipv6 = tcp_address_to_sockaddr_numeric_v6 (&sock_len_ipv6, *i6,
                                                        *port);

    po->addr_len_ipv6 = sock_len_ipv6;

    GNUNET_free (i6);
  }

  GNUNET_free (i4);

  return po;
}

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extract_address()

static char* extract_address ( const char *  bindto )

static

This Method extracts the address part of the BINDTO string.

Parameters

bindto

String we extract the address part from.

Returns

The extracted address string.

Definition at line 2108 of file gnunet-communicator-tcp.c.

References GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_strdup, and start.

Referenced by run(), and tcp_address_to_sockaddr().

{

  char *start;
  char *token;
  char *cp;
  char *rest = NULL;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "extract address with bindto %s\n",
              bindto);

  if (NULL == bindto)
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "bindto is NULL\n");

  cp = GNUNET_strdup (bindto);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "extract address 2\n");

  start = cp;
  if (('[' == *cp) && (']' == cp[strlen (cp) - 1]))
  {
    start++;   /* skip over '['*/
    cp[strlen (cp) - 1] = '\0';  /* eat ']'*/
  }
  else
  {
    token = strtok_r (cp, "]", &rest);
    if (strlen (bindto) == strlen (token))
    {
      token = strtok_r (cp, ":", &rest);
    }
    else
    {
      token++;
      return token;
    }
  }

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "extract address 3\n");
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "extract address with start %s\n",
              start);

  return start;
}

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extract_port()

static unsigned int extract_port ( const char *  addr_and_port )

static

This Method extracts the port part of the BINDTO string.

Parameters

addr_and_port

String we extract the port from.

Returns

The extracted port as unsigned int.

Definition at line 2166 of file gnunet-communicator-tcp.c.

References dummy, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_strdup, and port.

Referenced by run(), and tcp_address_to_sockaddr().

{
  unsigned int port;
  char dummy[2];
  char *token;
  char *addr;
  char *colon;
  char *cp;
  char *rest = NULL;

  if (NULL != addr_and_port)
  {
    cp = GNUNET_strdup (addr_and_port);
    token = strtok_r (cp, "]", &rest);
    if (strlen (addr_and_port) == strlen (token))
    {
      colon = strrchr (cp, ':');
      if (NULL == colon)
      {
        return 0;
      }
      addr = colon;
      addr++;
    }
    else
    {
      token = strtok_r (NULL, "]", &rest);
      if (NULL == token)
      {
        return 0;
      }
      else
      {
        addr = token;
        addr++;
      }
    }


    if (1 == sscanf (addr, "%u%1s", &port, dummy))
    {
      /* interpreting value as just a PORT number */
      if (port > UINT16_MAX)
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    "Port `%u' invalid: value too large for port\n",
                    port);
        // GNUNET_free (cp);
        return 0;
      }
    }
    else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                  "BINDTO specification invalid: last ':' not followed by number\n");
      // GNUNET_free (cp);
      return 0;
    }
  }
  else
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "return 0\n");
    /* interpret missing port as 0, aka pick any free one */
    port = 0;
  }


  return port;
}

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tcp_address_to_sockaddr()

static struct sockaddr* tcp_address_to_sockaddr ( const char *  bindto, socklen_t *  sock_len  )

static

Convert TCP bind specification to a struct sockaddr *

Parameters

	bindto	bind specification to convert
[out]	sock_len	set to the length of the address

Returns

converted bindto specification

Definition at line 2246 of file gnunet-communicator-tcp.c.

References extract_address(), extract_port(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, port, start, tcp_address_to_sockaddr_numeric_v4(), and tcp_address_to_sockaddr_numeric_v6().

Referenced by mq_init().

{
  struct sockaddr *in;
  unsigned int port;
  struct sockaddr_in v4;
  struct sockaddr_in6 v6;
  const char *start;

  // cp = GNUNET_strdup (bindto);
  start = extract_address (bindto);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "start %s\n",
              start);

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "!bindto %s\n",
              bindto);


  if (1 == inet_pton (AF_INET, start, &v4.sin_addr))
  {
    // colon = strrchr (cp, ':');
    port = extract_port (bindto);

    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "port %u\n",
                port);

    in = tcp_address_to_sockaddr_numeric_v4 (sock_len, v4, port);
  }
  else if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
  {
    // colon = strrchr (cp, ':');
    port = extract_port (bindto);
    in = tcp_address_to_sockaddr_numeric_v6 (sock_len, v6, port);
  }
  else
  {
    GNUNET_assert (0);
  }

  // GNUNET_free (start);

  return in;
}

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mq_send()

static void mq_send ( struct GNUNET_MQ_Handle *  mq, const struct GNUNET_MessageHeader *  msg, void *  impl_state  )

static

Signature of functions implementing the sending functionality of a message queue.

Parameters

mq	the message queue
msg	the message to send
impl_state	our struct Queue

Definition at line 2303 of file gnunet-communicator-tcp.c.

References calculate_hmac(), Queue::finishing, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX, GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, TCPBox::header, TCPBox::hmac, Queue::mq, Queue::mq_awaits_continue, Queue::out_hmac, Queue::pwrite_buf, Queue::pwrite_off, queue(), queue_write(), GNUNET_MessageHeader::size, Queue::sock, GNUNET_MessageHeader::type, and Queue::write_task.

Referenced by boot_queue().

{
  struct Queue *queue = impl_state;
  uint16_t msize = ntohs (msg->size);
  struct TCPBox box;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "In MQ send. Queue finishing: %s; write task running: %s\n",
              (GNUNET_YES == queue->finishing) ? "yes" : "no",
              (NULL == queue->write_task) ? "yes" : "no");
  GNUNET_assert (mq == queue->mq);
  queue->mq_awaits_continue = GNUNET_YES;
  if (GNUNET_YES == queue->finishing)
    return; /* this queue is dying, drop msg */
  GNUNET_assert (0 == queue->pwrite_off);
  box.header.type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX);
  box.header.size = htons (msize);
  calculate_hmac (&queue->out_hmac, msg, msize, &box.hmac);
  memcpy (&queue->pwrite_buf[queue->pwrite_off], &box, sizeof(box));
  queue->pwrite_off += sizeof(box);
  memcpy (&queue->pwrite_buf[queue->pwrite_off], msg, msize);
  queue->pwrite_off += msize;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "%lu bytes of plaintext to send\n", queue->pwrite_off);
  GNUNET_assert (NULL != queue->sock);
  if (NULL == queue->write_task)
    queue->write_task =
      GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                      queue->sock,
                                      &queue_write,
                                      queue);
}

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mq_destroy()

static void mq_destroy ( struct GNUNET_MQ_Handle *  mq, void *  impl_state  )

static

Signature of functions implementing the destruction of a message queue.

Implementations must not free mq, but should take care of impl_state.

Parameters

mq	the message queue to destroy
impl_state	our struct Queue

Definition at line 2347 of file gnunet-communicator-tcp.c.

References Queue::mq, queue(), and queue_finish().

Referenced by boot_queue().

{
  struct Queue *queue = impl_state;

  if (mq == queue->mq)
  {
    queue->mq = NULL;
    queue_finish (queue);
  }
}

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mq_cancel()

static void mq_cancel ( struct GNUNET_MQ_Handle *  mq, void *  impl_state  )

static

Implementation function that cancels the currently sent message.

Parameters

mq	message queue
impl_state	our struct Queue

Definition at line 2366 of file gnunet-communicator-tcp.c.

References GNUNET_assert, Queue::pwrite_off, and queue().

Referenced by boot_queue().

{
  struct Queue *queue = impl_state;

  GNUNET_assert (0 != queue->pwrite_off);
  queue->pwrite_off = 0;
}

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mq_error()

static void mq_error ( void *  cls, enum GNUNET_MQ_Error  error  )

static

Generic error handler, called with the appropriate error code and the same closure specified at the creation of the message queue.

Not every message queue implementation supports an error handler.

Parameters

cls	our struct Queue
error	error code

Definition at line 2385 of file gnunet-communicator-tcp.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, queue(), queue_finish(), and Queue::target.

Referenced by boot_queue().

{
  struct Queue *queue = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
              "MQ error in queue to %s: %d\n",
              GNUNET_i2s (&queue->target),
              (int) error);
  queue_finish (queue);
}

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boot_queue()

static void boot_queue ( struct Queue *  queue )

static

Add the given queue to our internal data structure.

Setup the MQ processing and inform transport that the queue is ready. Must be called after the KX for outgoing messages has been bootstrapped.

Parameters

queue

queue to boot

Definition at line 2405 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::address_len, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_CONTAINER_multipeermap_put(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_MQ_queue_for_callbacks(), GNUNET_NO, GNUNET_NT_scanner_get_type(), GNUNET_STATISTICS_set(), GNUNET_TIME_relative_to_absolute(), Queue::mq, mq_cancel(), mq_destroy(), mq_error(), mq_send(), Queue::nt, Queue::target, and Queue::timeout.

Referenced by mq_init(), and proto_read_kx().

{
  queue->nt =
    GNUNET_NT_scanner_get_type (is, queue->address, queue->address_len);
  (void) GNUNET_CONTAINER_multipeermap_put (
    queue_map,
    &queue->target,
    queue,
    GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
  GNUNET_STATISTICS_set (stats,
                         "# queues active",
                         GNUNET_CONTAINER_multipeermap_size (queue_map),
                         GNUNET_NO);
  queue->timeout =
    GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT);
  queue->mq = GNUNET_MQ_queue_for_callbacks (&mq_send,
                                             &mq_destroy,
                                             &mq_cancel,
                                             queue,
                                             NULL,
                                             &mq_error,
                                             queue);
  /* { */
  /*   char *foreign_addr; */

  /*   switch (queue->address->sa_family) */
  /*   { */
  /*   case AF_INET: */
  /*     GNUNET_asprintf (&foreign_addr, */
  /*                      "%s-%s", */
  /*                      COMMUNICATOR_ADDRESS_PREFIX, */
  /*                      GNUNET_a2s (queue->address, queue->address_len)); */
  /*     break; */

  /*   case AF_INET6: */
  /*     GNUNET_asprintf (&foreign_addr, */
  /*                      "%s-%s", */
  /*                      COMMUNICATOR_ADDRESS_PREFIX, */
  /*                      GNUNET_a2s (queue->address, queue->address_len)); */
  /*     break; */

  /*   default: */
  /*     GNUNET_assert (0); */
  /*   } */
  /*   queue->qh = GNUNET_TRANSPORT_communicator_mq_add (ch, */
  /*                                                     &queue->target, */
  /*                                                     foreign_addr, */
  /*                                                     0 /\* no MTU *\/, */
  /*                                                     GNUNET_TRANSPORT_QUEUE_LENGTH_UNLIMITED, */
  /*                                                     0, /\* Priority *\/ */
  /*                                                     queue->nt, */
  /*                                                     queue->cs, */
  /*                                                     queue->mq); */
  /*   GNUNET_free (foreign_addr); */
  /* } */
}

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transmit_kx()

static void transmit_kx ( struct Queue *  queue, const struct GNUNET_CRYPTO_EcdhePublicKey *  epub  )

static

Generate and transmit our ephemeral key and the signature for the initial KX with the other peer.

Must be called first, before any other bytes are ever written to the output buffer. Note that our cipher must already be initialized when calling this function. Helper function for start_initial_kx_out().

Parameters

queue	queue to do KX for
epub	our public key for the KX

Definition at line 2474 of file gnunet-communicator-tcp.c.

References Queue::challenge, TcpHandshakeSignature::challenge, TCPConfirmation::challenge, Queue::cwrite_buf, Queue::cwrite_off, TcpHandshakeSignature::ephemeral, GNUNET_assert, GNUNET_CRYPTO_eddsa_sign, GNUNET_CRYPTO_QUALITY_NONCE, GNUNET_CRYPTO_random_block(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_log_from_nocheck(), GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), TcpHandshakeSignature::monotonic_time, TCPConfirmation::monotonic_time, my_identity, Queue::out_cipher, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, TcpHandshakeSignature::receiver, TCPConfirmation::sender, TcpHandshakeSignature::sender, TCPConfirmation::sender_sig, GNUNET_CRYPTO_EccSignaturePurpose::size, Queue::target, and tc.

Referenced by start_initial_kx_out().

{
  struct TcpHandshakeSignature ths;
  struct TCPConfirmation tc;

  memcpy (queue->cwrite_buf, epub, sizeof(*epub));
  queue->cwrite_off = sizeof(*epub);
  /* compute 'tc' and append in encrypted format to cwrite_buf */
  tc.sender = my_identity;
  tc.monotonic_time =
    GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get_monotonic (cfg));
  GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
                              &tc.challenge,
                              sizeof(tc.challenge));
  ths.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE);
  ths.purpose.size = htonl (sizeof(ths));
  ths.sender = my_identity;
  ths.receiver = queue->target;
  ths.ephemeral = *epub;
  ths.monotonic_time = tc.monotonic_time;
  ths.challenge = tc.challenge;
  GNUNET_CRYPTO_eddsa_sign (my_private_key,
                            &ths,
                            &tc.sender_sig);
  GNUNET_assert (0 ==
                 gcry_cipher_encrypt (queue->out_cipher,
                                      &queue->cwrite_buf[queue->cwrite_off],
                                      sizeof(tc),
                                      &tc,
                                      sizeof(tc)));
  queue->challenge = tc.challenge;
  queue->cwrite_off += sizeof(tc);

  GNUNET_log_from_nocheck (GNUNET_ERROR_TYPE_DEBUG,
                           "transport",
                           "handshake written\n");
}

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start_initial_kx_out()

static void start_initial_kx_out ( struct Queue *  queue )

static

Initialize our key material for outgoing transmissions and inform the other peer about it.

Must be called first before any data is sent.

Parameters

queue

the queue to setup

Definition at line 2522 of file gnunet-communicator-tcp.c.

References Queue::ephemeral, GNUNET_CRYPTO_ecdhe_key_create(), GNUNET_CRYPTO_ecdhe_key_get_public(), setup_out_cipher(), and transmit_kx().

Referenced by mq_init(), and proto_read_kx().

{
  struct GNUNET_CRYPTO_EcdhePublicKey epub;

  GNUNET_CRYPTO_ecdhe_key_create (&queue->ephemeral);
  GNUNET_CRYPTO_ecdhe_key_get_public (&queue->ephemeral, &epub);
  setup_out_cipher (queue);
  transmit_kx (queue, &epub);
}

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handshake_monotime_store_cb()

static void handshake_monotime_store_cb ( void *  cls, int  success  )

static

Callback called when peerstore store operation for handshake monotime is finished.

Parameters

cls	Queue context the store operation was executed.
success	Store operation was successful (GNUNET_OK) or not.

Definition at line 2539 of file gnunet-communicator-tcp.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, Queue::handshake_monotime_sc, and queue().

Referenced by handshake_monotime_cb().

{
  struct Queue *queue = cls;
  if (GNUNET_OK != success)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to store handshake monotonic time in PEERSTORE!\n");
  }
  queue->handshake_monotime_sc = NULL;
}

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handshake_monotime_cb()

static void handshake_monotime_cb ( void *  cls, const struct GNUNET_PEERSTORE_Record *  record, const char *  emsg  )

static

Callback called by peerstore when records for GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE where found.

Parameters

cls	Queue context the store operation was executed.
record	The record found or NULL if there is no record left.
emsg	Message from peerstore.

Definition at line 2559 of file gnunet-communicator-tcp.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_break, GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, GNUNET_PEERSTORE_store(), GNUNET_PEERSTORE_STOREOPTION_REPLACE, GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE, GNUNET_TIME_absolute_ntoh(), GNUNET_TIME_UNIT_FOREVER_ABS, Queue::handshake_monotime_get, Queue::handshake_monotime_sc, handshake_monotime_store_cb(), Queue::handshake_monotonic_time, pid, queue(), queue_finish(), Queue::target, GNUNET_PEERSTORE_Record::value, and GNUNET_PEERSTORE_Record::value_size.

Referenced by decrypt_and_check_tc().

{
  struct Queue *queue = cls;
  struct GNUNET_TIME_AbsoluteNBO *mtbe;
  struct GNUNET_TIME_Absolute mt;
  const struct GNUNET_PeerIdentity *pid;
  struct GNUNET_TIME_AbsoluteNBO *handshake_monotonic_time;

  (void) emsg;

  handshake_monotonic_time = &queue->handshake_monotonic_time;
  pid = &queue->target;
  if (NULL == record)
  {
    queue->handshake_monotime_get = NULL;
    return;
  }
  if (sizeof(*mtbe) != record->value_size)
  {
    GNUNET_break (0);
    return;
  }
  mtbe = record->value;
  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
        queue->handshake_monotonic_time).abs_value_us)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Queue from %s dropped, handshake monotime in the past\n",
                GNUNET_i2s (&queue->target));
    GNUNET_break (0);
    queue_finish (queue);
    return;
  }
  queue->handshake_monotime_sc = GNUNET_PEERSTORE_store (peerstore,
                                                         "transport_tcp_communicator",
                                                         pid,
                                                         GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE,
                                                         handshake_monotonic_time,
                                                         sizeof(
                                                           handshake_monotonic_time),
                                                         GNUNET_TIME_UNIT_FOREVER_ABS,
                                                         GNUNET_PEERSTORE_STOREOPTION_REPLACE,
                                                         &
                                                         handshake_monotime_store_cb,
                                                         queue);
}

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decrypt_and_check_tc()

static int decrypt_and_check_tc ( struct Queue *  queue, struct TCPConfirmation *  tc, char *  ibuf  )

static

We have received the first bytes from the other side on a queue.

Decrypt the tc contained in ibuf and check the signature. Note that setup_in_cipher() must have already been called.

Parameters

queue	queue to decrypt initial bytes from other peer for
tc[out]	where to store the result
ibuf	incoming data, of size INITIAL_KX_SIZE

Returns

GNUNET_OK if the signature was OK, GNUNET_SYSERR if not

Definition at line 2622 of file gnunet-communicator-tcp.c.

References TcpHandshakeSignature::challenge, TCPConfirmation::challenge, TcpHandshakeSignature::ephemeral, GNUNET_assert, GNUNET_CRYPTO_eddsa_verify, GNUNET_PEERSTORE_iterate(), GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE, GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE, handshake_monotime_cb(), Queue::handshake_monotime_get, Queue::in_cipher, TCPConfirmation::monotonic_time, TcpHandshakeSignature::monotonic_time, my_identity, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, TcpHandshakeSignature::receiver, TCPConfirmation::sender, TcpHandshakeSignature::sender, TCPConfirmation::sender_sig, GNUNET_CRYPTO_EccSignaturePurpose::size, and Queue::target.

Referenced by proto_read_kx(), and queue_read_kx().

{
  struct TcpHandshakeSignature ths;

  GNUNET_assert (
    0 ==
    gcry_cipher_decrypt (queue->in_cipher,
                         tc,
                         sizeof(*tc),
                         &ibuf[sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)],
                         sizeof(*tc)));
  ths.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE);
  ths.purpose.size = htonl (sizeof(ths));
  ths.sender = tc->sender;
  ths.receiver = my_identity;
  memcpy (&ths.ephemeral, ibuf, sizeof(struct GNUNET_CRYPTO_EcdhePublicKey));
  ths.monotonic_time = tc->monotonic_time;
  ths.challenge = tc->challenge;
  return GNUNET_CRYPTO_eddsa_verify (
    GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE,
    &ths,
    &tc->sender_sig,
    &tc->sender.public_key);
  queue->handshake_monotime_get = GNUNET_PEERSTORE_iterate (peerstore,
                                                            "transport_tcp_communicator",
                                                            &queue->target,
                                                            GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE,
                                                            &
                                                            handshake_monotime_cb,
                                                            queue);
}

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free_proto_queue()

static void free_proto_queue ( struct ProtoQueue *  pq )

static

Closes socket and frees memory associated with pq.

Parameters

pq	proto queue to free

Definition at line 2663 of file gnunet-communicator-tcp.c.

References ProtoQueue::address, GNUNET_break, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_NETWORK_socket_close(), GNUNET_OK, ProtoQueue::listen_sock, and ProtoQueue::sock.

Referenced by do_shutdown(), and proto_read_kx().

{
  if (NULL != pq->listen_sock)
  {
    GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (pq->listen_sock));
    pq->listen_sock = NULL;
  }
  GNUNET_NETWORK_socket_close (pq->sock);
  GNUNET_free (pq->address);
  GNUNET_CONTAINER_DLL_remove (proto_head, proto_tail, pq);
  GNUNET_free (pq);
}

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proto_read_kx()

static void proto_read_kx ( void *  cls )

static

Read from the socket of the proto queue until we have enough data to upgrade to full queue.

Parameters

cls	a struct ProtoQueue

Definition at line 2684 of file gnunet-communicator-tcp.c.

References Queue::address, ProtoQueue::address, Queue::address_len, ProtoQueue::address_len, boot_queue(), TCPConfirmation::challenge, Queue::challenge_received, Queue::cs, decrypt_and_check_tc(), free_proto_queue(), GNUNET_a2s(), GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_free, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_recv(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_CS_INBOUND, ProtoQueue::ibuf, ProtoQueue::ibuf_off, Queue::in_cipher, Queue::listen_sock, ProtoQueue::listen_sock, queue(), queue_read(), queue_write(), Queue::read_task, ProtoQueue::read_task, GNUNET_TIME_Relative::rel_value_us, TCPConfirmation::sender, setup_in_cipher(), Queue::sock, ProtoQueue::sock, start_initial_kx_out(), Queue::target, ProtoQueue::timeout, and Queue::write_task.

Referenced by listen_cb().

{
  struct ProtoQueue *pq = cls;
  ssize_t rcvd;
  struct GNUNET_TIME_Relative left;
  struct Queue *queue;
  struct TCPConfirmation tc;

  pq->read_task = NULL;
  left = GNUNET_TIME_absolute_get_remaining (pq->timeout);
  if (0 == left.rel_value_us)
  {
    free_proto_queue (pq);
    return;
  }
  rcvd = GNUNET_NETWORK_socket_recv (pq->sock,
                                     &pq->ibuf[pq->ibuf_off],
                                     sizeof(pq->ibuf) - pq->ibuf_off);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received %lu bytes for KX\n", rcvd);
  if (-1 == rcvd)
  {
    if ((EAGAIN != errno) && (EINTR != errno))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "recv");
      free_proto_queue (pq);
      return;
    }
    /* try again */
    pq->read_task =
      GNUNET_SCHEDULER_add_read_net (left, pq->sock, &proto_read_kx, pq);
    return;
  }
  pq->ibuf_off += rcvd;
  if (pq->ibuf_off > sizeof(pq->ibuf))
  {
    /* read more */
    pq->read_task =
      GNUNET_SCHEDULER_add_read_net (left, pq->sock, &proto_read_kx, pq);
    return;
  }
  /* we got all the data, let's find out who we are talking to! */
  queue = GNUNET_new (struct Queue);
  setup_in_cipher ((const struct GNUNET_CRYPTO_EcdhePublicKey *) pq->ibuf,
                   queue);
  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, pq->ibuf))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Invalid TCP KX received from %s\n",
                GNUNET_a2s (queue->address, queue->address_len));
    gcry_cipher_close (queue->in_cipher);
    GNUNET_free (queue);
    free_proto_queue (pq);
    return;
  }
  queue->address = pq->address; /* steals reference */
  queue->address_len = pq->address_len;
  queue->target = tc.sender;
  queue->listen_sock = pq->listen_sock;
  queue->sock = pq->sock;


  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "start kx proto\n");

  start_initial_kx_out (queue);
  queue->cs = GNUNET_TRANSPORT_CS_INBOUND;
  boot_queue (queue);
  queue->read_task =
    GNUNET_SCHEDULER_add_read_net (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
                                   queue->sock,
                                   &queue_read,
                                   queue);
  queue->write_task =
    GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                    queue->sock,
                                    &queue_write,
                                    queue);
  // TODO To early! Move it somewhere else.
  // send_challenge (tc.challenge, queue);
  queue->challenge_received = tc.challenge;

  GNUNET_CONTAINER_DLL_remove (proto_head, proto_tail, pq);
  GNUNET_free (pq);
}

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queue_read_kx()

static void queue_read_kx ( void *  cls )

static

Read from the socket of the queue until we have enough data to initialize the decryption logic and can switch to regular reading.

Parameters

cls	a struct Queue

Definition at line 2833 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::address_len, BUF_SIZE, TCPConfirmation::challenge, Queue::cread_buf, Queue::cread_off, decrypt_and_check_tc(), GNUNET_a2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_recv(), GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_UNIT_FOREVER_REL, INITIAL_KX_SIZE, queue(), queue_destroy(), queue_read(), queue_write(), Queue::read_task, GNUNET_TIME_Relative::rel_value_us, reschedule_queue_timeout(), send_challenge(), TCPConfirmation::sender, setup_in_cipher(), Queue::sock, Queue::target, Queue::timeout, and Queue::write_task.

Referenced by mq_init().

{
  struct Queue *queue = cls;
  ssize_t rcvd;
  struct GNUNET_TIME_Relative left;
  struct TCPConfirmation tc;

  queue->read_task = NULL;
  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
  if (0 == left.rel_value_us)
  {
    queue_destroy (queue);
    return;
  }
  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
                                     &queue->cread_buf[queue->cread_off],
                                     BUF_SIZE - queue->cread_off);
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received %lu bytes for KX\n",
              rcvd);
  if (-1 == rcvd)
  {
    if ((EAGAIN != errno) && (EINTR != errno))
    {
      GNUNET_log_strerror (GNUNET_ERROR_TYPE_DEBUG, "recv");
      queue_destroy (queue);
      return;
    }
    queue->read_task =
      GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read_kx, queue);
    return;
  }
  queue->cread_off += rcvd;
  if (queue->cread_off < INITIAL_KX_SIZE)
  {
    /* read more */
    queue->read_task =
      GNUNET_SCHEDULER_add_read_net (left, queue->sock, &queue_read_kx, queue);
    return;
  }
  /* we got all the data, let's find out who we are talking to! */
  setup_in_cipher ((const struct GNUNET_CRYPTO_EcdhePublicKey *)
                   queue->cread_buf,
                   queue);
  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, queue->cread_buf))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                "Invalid TCP KX received from %s\n",
                GNUNET_a2s (queue->address, queue->address_len));
    queue_destroy (queue);
    return;
  }
  if (0 !=
      memcmp (&tc.sender, &queue->target, sizeof(struct GNUNET_PeerIdentity)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "Invalid sender in TCP KX received from %s\n",
                GNUNET_a2s (queue->address, queue->address_len));
    queue_destroy (queue);
    return;
  }
  send_challenge (tc.challenge, queue);
  queue->write_task =
    GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                    queue->sock,
                                    &queue_write,
                                    queue);

  /* update queue timeout */
  reschedule_queue_timeout (queue);
  /* prepare to continue with regular read task immediately */
  memmove (queue->cread_buf,
           &queue->cread_buf[INITIAL_KX_SIZE],
           queue->cread_off - (INITIAL_KX_SIZE));
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "cread_off is %lu bytes before adjusting\n",
              queue->cread_off);
  queue->cread_off -= INITIAL_KX_SIZE;
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "cread_off set to %lu bytes\n",
              queue->cread_off);
  if (0 <= queue->cread_off)
    queue->read_task = GNUNET_SCHEDULER_add_now (&queue_read, queue);
}

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mq_init()

static int mq_init ( void *  cls, const struct GNUNET_PeerIdentity *  peer, const char *  address  )

static

Function called by the transport service to initialize a message queue given address information about another peer.

If and when the communication channel is established, the communicator must call GNUNET_TRANSPORT_communicator_mq_add() to notify the service that the channel is now up. It is the responsibility of the communicator to manage sane retries and timeouts for any peer/address combination provided by the transport service. Timeouts and retries do not need to be signalled to the transport service.

Parameters

cls	closure
peer	identity of the other peer
address	where to send the message, human-readable communicator-specific format, 0-terminated, UTF-8

Returns

GNUNET_OK on success, GNUNET_SYSERR if the provided address is invalid

Definition at line 2938 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::address_len, boot_queue(), COMMUNICATOR_ADDRESS_PREFIX, Queue::cs, GNUNET_a2s(), GNUNET_break_op, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_log, GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_connect(), GNUNET_NETWORK_socket_create(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_write_net(), GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_CS_OUTBOUND, peer, queue(), queue_read_kx(), queue_write(), Queue::read_task, Queue::sock, start_initial_kx_out(), Queue::target, tcp_address_to_sockaddr(), and Queue::write_task.

Referenced by GNUNET_TRANSPORT_communicator_connect(), and init_socket().

{
  struct Queue *queue;
  const char *path;
  struct sockaddr *in;
  socklen_t in_len = 0;
  struct GNUNET_NETWORK_Handle *sock;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Connecting to %s\n", address);
  if (0 != strncmp (address,
                    COMMUNICATOR_ADDRESS_PREFIX "-",
                    strlen (COMMUNICATOR_ADDRESS_PREFIX "-")))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  path = &address[strlen (COMMUNICATOR_ADDRESS_PREFIX "-")];
  in = tcp_address_to_sockaddr (path, &in_len);

  if (NULL == in)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                "Failed to setup TCP socket address\n");
    return GNUNET_SYSERR;
  }

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "in %s\n",
              GNUNET_a2s (in, in_len));

  sock = GNUNET_NETWORK_socket_create (in->sa_family, SOCK_STREAM, IPPROTO_TCP);
  if (NULL == sock)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "socket(%d) failed: %s",
                in->sa_family,
                strerror (errno));
    GNUNET_free (in);
    return GNUNET_SYSERR;
  }
  if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (sock, in, in_len)) &&
      (errno != EINPROGRESS))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
                "connect to `%s' failed: %s",
                address,
                strerror (errno));
    GNUNET_NETWORK_socket_close (sock);
    GNUNET_free (in);
    return GNUNET_SYSERR;
  }

  queue = GNUNET_new (struct Queue);
  queue->target = *peer;
  queue->address = in;
  queue->address_len = in_len;
  queue->sock = sock;
  queue->cs = GNUNET_TRANSPORT_CS_OUTBOUND;
  boot_queue (queue);
  // queue->mq_awaits_continue = GNUNET_YES;
  queue->read_task =
    GNUNET_SCHEDULER_add_read_net (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
                                   queue->sock,
                                   &queue_read_kx,
                                   queue);


  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "start kx mq_init\n");

  start_initial_kx_out (queue);
  queue->write_task =
    GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
                                    queue->sock,
                                    &queue_write,
                                    queue);
  return GNUNET_OK;
}

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get_lt_delete_it()

static int get_lt_delete_it ( void *  cls, const struct GNUNET_HashCode *  key, void *  value  )

static

Iterator over all ListenTasks to clean up.

Parameters

cls	NULL
key	unused
value	the ListenTask to cancel.

Returns

GNUNET_OK to continue to iterate

Definition at line 3028 of file gnunet-communicator-tcp.c.

References GNUNET_break, GNUNET_NETWORK_socket_close(), GNUNET_OK, GNUNET_SCHEDULER_cancel(), ListenTask::listen_sock, ListenTask::listen_task, and value.

Referenced by do_shutdown().

{
  struct ListenTask *lt = value;

  (void) cls;
  (void) key;
  if (NULL != lt->listen_task)
  {
    GNUNET_SCHEDULER_cancel (lt->listen_task);
    lt->listen_task = NULL;
  }
  if (NULL != lt->listen_sock)
  {
    GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (lt->listen_sock));
    lt->listen_sock = NULL;
  }
  return GNUNET_OK;
}

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get_queue_delete_it()

static int get_queue_delete_it ( void *  cls, const struct GNUNET_PeerIdentity *  target, void *  value  )

static

Iterator over all message queues to clean up.

Parameters

cls	NULL
target	unused
value	the queue to destroy

Returns

GNUNET_OK to continue to iterate

Definition at line 3059 of file gnunet-communicator-tcp.c.

References GNUNET_OK, queue(), queue_destroy(), and value.

Referenced by do_shutdown().

{
  struct Queue *queue = value;

  (void) cls;
  (void) target;
  queue_destroy (queue);
  return GNUNET_OK;
}

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do_shutdown()

static void do_shutdown ( void *  cls )

static

Shutdown the UNIX communicator.

Parameters

cls	NULL (always)

Definition at line 3078 of file gnunet-communicator-tcp.c.

References free_proto_queue(), get_lt_delete_it(), get_queue_delete_it(), GNUNET_CONTAINER_multihashmap_iterate(), GNUNET_CONTAINER_multipeermap_destroy(), GNUNET_CONTAINER_multipeermap_iterate(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_NAT_unregister(), GNUNET_NO, GNUNET_NT_scanner_done(), GNUNET_PEERSTORE_disconnect(), GNUNET_RESOLVER_request_cancel(), GNUNET_STATISTICS_destroy(), GNUNET_TRANSPORT_communicator_address_remove_all(), GNUNET_TRANSPORT_communicator_disconnect(), GNUNET_YES, and shutdown_running.

Referenced by run().

{
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Shutdown %s!\n",
              shutdown_running ? "running" : "not running");

  if (GNUNET_YES == shutdown_running)
    return;
  else
    shutdown_running = GNUNET_YES;

  while (NULL != proto_head)
    free_proto_queue (proto_head);
  if (NULL != nat)
  {
    GNUNET_NAT_unregister (nat);
    nat = NULL;
  }
  GNUNET_CONTAINER_multihashmap_iterate (lt_map, &get_lt_delete_it, NULL);
  GNUNET_CONTAINER_multipeermap_iterate (queue_map, &get_queue_delete_it, NULL);
  GNUNET_CONTAINER_multipeermap_destroy (queue_map);
  GNUNET_TRANSPORT_communicator_address_remove_all (ch);
  if (NULL != ch)
  {
    GNUNET_TRANSPORT_communicator_disconnect (ch);
    ch = NULL;
  }
  if (NULL != stats)
  {
    GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
    stats = NULL;
  }
  if (NULL != my_private_key)
  {
    GNUNET_free (my_private_key);
    my_private_key = NULL;
  }
  if (NULL != is)
  {
    GNUNET_NT_scanner_done (is);
    is = NULL;
  }
  if (NULL != peerstore)
  {
    GNUNET_PEERSTORE_disconnect (peerstore, GNUNET_NO);
    peerstore = NULL;
  }
  if (NULL != resolve_request_handle)
  {
    GNUNET_RESOLVER_request_cancel (resolve_request_handle);
    resolve_request_handle = NULL;
  }
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Shutdown done!\n");
}

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enc_notify_cb()

static void enc_notify_cb ( void *  cls, const struct GNUNET_PeerIdentity *  sender, const struct GNUNET_MessageHeader *  msg  )

static

Function called when the transport service has received an acknowledgement for this communicator (!) via a different return path.

Not applicable for TCP.

Parameters

cls	closure
sender	which peer sent the notification
msg	payload

Definition at line 3147 of file gnunet-communicator-tcp.c.

References GNUNET_break_op.

Referenced by init_socket().

{
  (void) cls;
  (void) sender;
  (void) msg;
  GNUNET_break_op (0);
}

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nat_address_cb()

static void nat_address_cb ( void *  cls, void **  app_ctx, int  add_remove, enum GNUNET_NAT_AddressClass  ac, const struct sockaddr *  addr, socklen_t  addrlen  )

static

Signature of the callback passed to GNUNET_NAT_register() for a function to call whenever our set of 'valid' addresses changes.

Parameters

cls	closure
app_ctx[in,out]	location where the app can store stuff on add and retrieve it on remove
add_remove	GNUNET_YES to add a new public IP address, GNUNET_NO to remove a previous (now invalid) one
ac	address class the address belongs to
addr	either the previous or the new public IP address
addrlen	actual length of the addr

Definition at line 3172 of file gnunet-communicator-tcp.c.

References ai, COMMUNICATOR_ADDRESS_PREFIX, GNUNET_a2s(), GNUNET_asprintf(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_NT_scanner_get_type(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_communicator_address_add(), GNUNET_TRANSPORT_communicator_address_remove(), GNUNET_YES, and nt.

Referenced by nat_register().

{
  char *my_addr;
  struct GNUNET_TRANSPORT_AddressIdentifier *ai;

  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "nat address cb %s %s\n",
              add_remove ? "add" : "remove",
              GNUNET_a2s (addr, addrlen));

  if (GNUNET_YES == add_remove)
  {
    enum GNUNET_NetworkType nt;

    GNUNET_asprintf (&my_addr,
                     "%s-%s",
                     COMMUNICATOR_ADDRESS_PREFIX,
                     GNUNET_a2s (addr, addrlen));
    nt = GNUNET_NT_scanner_get_type (is, addr, addrlen);
    ai =
      GNUNET_TRANSPORT_communicator_address_add (ch,
                                                 my_addr,
                                                 nt,
                                                 GNUNET_TIME_UNIT_FOREVER_REL);
    GNUNET_free (my_addr);
    *app_ctx = ai;
  }
  else
  {
    ai = *app_ctx;
    GNUNET_TRANSPORT_communicator_address_remove (ai);
    *app_ctx = NULL;
  }
}

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add_addr()

static void add_addr ( struct sockaddr *  in, socklen_t  in_len  )

static

This method adds addresses to the DLL, that are later register at the NAT service.

Definition at line 3217 of file gnunet-communicator-tcp.c.

References Addresses::addr, Addresses::addr_len, addrs_lens, GNUNET_a2s(), GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, and GNUNET_new.

Referenced by init_socket().

{

  struct Addresses *saddrs;

  GNUNET_log (GNUNET_