GNUnet  0.17.6
Data Structures | Macros | Functions | Variables
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 GNUNET_CRYPTO_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 PortOnlyIpv4Ipv6tcp_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_Handlestats
 For logging statistics. More...
 
static struct GNUNET_TRANSPORT_CommunicatorHandlech
 Our environment. More...
 
static struct GNUNET_CONTAINER_MultiPeerMapqueue_map
 Queues (map from peer identity to struct Queue) More...
 
static struct GNUNET_CONTAINER_MultiHashMaplt_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_EddsaPrivateKeymy_private_key
 Our private key. More...
 
static const struct GNUNET_CONFIGURATION_Handlecfg
 Our configuration. More...
 
static struct GNUNET_NT_InterfaceScanneris
 Network scanner to determine network types. More...
 
static struct GNUNET_NAT_Handlenat
 Connection to NAT service. More...
 
static struct ProtoQueueproto_head
 Protoqueues DLL head. More...
 
static struct ProtoQueueproto_tail
 Protoqueues DLL tail. More...
 
struct GNUNET_RESOLVER_RequestHandleresolve_request_handle
 Handle for DNS lookup of bindto address. More...
 
struct Addressesaddrs_head
 Head of DLL with addresses we like to register at NAT servcie. More...
 
struct Addressesaddrs_tail
 Head of DLL with addresses we like to register at NAT servcie. More...
 
struct ListenTasklts_head
 Head of DLL with ListenTasks. More...
 
struct ListenTasklts_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_Handlepeerstore
 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:

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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

◆ INITIAL_KX_SIZE

#define INITIAL_KX_SIZE
Value:
(sizeof(struct GNUNET_CRYPTO_EcdhePublicKey) \
+ sizeof(struct TCPConfirmation))
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
Encrypted continuation of TCP initial handshake.

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

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

◆ INITIAL_CORE_KX_SIZE

#define INITIAL_CORE_KX_SIZE
Value:
(sizeof(struct EphemeralKeyMessage) \
+ sizeof(struct PingMessage) \
+ sizeof(struct PongMessage))
Message transmitted with the signed ephemeral key of a peer.
We're sending an (encrypted) PING to the other peer to check if it can decrypt.
Response to a PING.

Size of the initial core key exchange messages.

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

◆ COMMUNICATOR_ADDRESS_PREFIX

#define COMMUNICATOR_ADDRESS_PREFIX   "tcp"

Address prefix used by the communicator.

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

◆ 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.

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
clsNULL

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

Parameters
clsListenTask with listening socket and task

Definition at line 2784 of file gnunet-communicator-tcp.c.

2785 {
2786  struct sockaddr_storage in;
2787  socklen_t addrlen;
2788  struct GNUNET_NETWORK_Handle *sock;
2789  struct ProtoQueue *pq;
2790  struct ListenTask *lt;
2791 
2793  "listen_cb\n");
2794 
2795  lt = cls;
2796 
2797  lt->listen_task = NULL;
2798  GNUNET_assert (NULL != lt->listen_sock);
2799  addrlen = sizeof(in);
2800  memset (&in, 0, sizeof(in));
2802  (struct sockaddr*) &in,
2803  &addrlen);
2804  if ((NULL == sock) && ((EMFILE == errno) || (ENFILE == errno)))
2805  return; /* system limit reached, wait until connection goes down */
2807  lt->listen_sock,
2808  &listen_cb,
2809  lt);
2810  if ((NULL == sock) && ((EAGAIN == errno) || (ENOBUFS == errno)))
2811  return;
2812  if (NULL == sock)
2813  {
2815  return;
2816  }
2817  pq = GNUNET_new (struct ProtoQueue);
2818  pq->address_len = addrlen;
2819  pq->address = GNUNET_memdup (&in, addrlen);
2821  pq->sock = sock;
2823  pq->sock,
2824  &proto_read_kx,
2825  pq);
2827 }
static void listen_cb(void *cls)
We have been notified that our listen socket has something to read.
static struct ProtoQueue * proto_tail
Protoqueues DLL tail.
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.
#define PROTO_QUEUE_TIMEOUT
How long do we wait until we must have received the initial KX?
static struct ProtoQueue * proto_head
Protoqueues DLL head.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
#define GNUNET_log(kind,...)
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...
@ GNUNET_ERROR_TYPE_WARNING
@ GNUNET_ERROR_TYPE_DEBUG
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_accept(const struct GNUNET_NETWORK_Handle *desc, struct sockaddr *address, socklen_t *address_len)
Accept a new connection on a socket.
Definition: network.c:392
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1502
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:315
handle to a socket
Definition: network.c:53
Struct to use as closure.
struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
Handle for an incoming connection where we do not yet have enough information to setup a full queue.
socklen_t address_len
Length of the address.
struct GNUNET_TIME_Absolute timeout
Timeout for this protoqueue.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct sockaddr * address
Address of the other peer.
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.

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_head, PROTO_QUEUE_TIMEOUT, proto_read_kx(), proto_tail, ProtoQueue::read_task, ProtoQueue::sock, and ProtoQueue::timeout.

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

Here is the call graph for this function:
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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
queuequeue to close down

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

877 {
878  struct ListenTask *lt = NULL;
879  struct GNUNET_HashCode h_sock;
880  int sockfd;
881 
882  if (NULL != queue->listen_sock)
883  {
884  sockfd = GNUNET_NETWORK_get_fd (queue->listen_sock);
885  GNUNET_CRYPTO_hash (&sockfd,
886  sizeof(int),
887  &h_sock);
888 
890  }
891 
893  "Disconnecting queue for peer `%s'\n",
894  GNUNET_i2s (&queue->target));
895  if (NULL != queue->rekey_monotime_sc)
896  {
897  GNUNET_PEERSTORE_store_cancel (queue->rekey_monotime_sc);
898  queue->rekey_monotime_sc = NULL;
899  }
900  if (NULL != queue->handshake_monotime_sc)
901  {
902  GNUNET_PEERSTORE_store_cancel (queue->handshake_monotime_sc);
903  queue->handshake_monotime_sc = NULL;
904  }
905  if (NULL != queue->handshake_ack_monotime_sc)
906  {
907  GNUNET_PEERSTORE_store_cancel (queue->handshake_ack_monotime_sc);
908  queue->handshake_ack_monotime_sc = NULL;
909  }
910  if (NULL != queue->rekey_monotime_get)
911  {
912  GNUNET_PEERSTORE_iterate_cancel (queue->rekey_monotime_get);
913  queue->rekey_monotime_get = NULL;
914  }
915  if (NULL != queue->handshake_monotime_get)
916  {
917  GNUNET_PEERSTORE_iterate_cancel (queue->handshake_monotime_get);
918  queue->handshake_monotime_get = NULL;
919  }
920  if (NULL != queue->handshake_ack_monotime_get)
921  {
922  GNUNET_PEERSTORE_iterate_cancel (queue->handshake_ack_monotime_get);
923  queue->handshake_ack_monotime_get = NULL;
924  }
925  if (NULL != queue->qh)
926  {
928  queue->qh = NULL;
929  }
930  GNUNET_assert (
931  GNUNET_YES ==
934  "# queues active",
936  GNUNET_NO);
937  if (NULL != queue->read_task)
938  {
939  GNUNET_SCHEDULER_cancel (queue->read_task);
940  queue->read_task = NULL;
941  }
942  if (NULL != queue->write_task)
943  {
944  GNUNET_SCHEDULER_cancel (queue->write_task);
945  queue->write_task = NULL;
946  }
948  {
950  "closing socket failed\n");
951  }
952  gcry_cipher_close (queue->in_cipher);
953  gcry_cipher_close (queue->out_cipher);
954  GNUNET_free (queue->address);
955  if (0 != queue->backpressure)
956  queue->destroyed = GNUNET_YES;
957  else
958  GNUNET_free (queue);
959 
960  if (NULL == lt)
961  return;
962 
963  if ((! shutdown_running) && (NULL == lt->listen_task))
964  {
966  "add read net listen\n");
969  lt->listen_sock,
970  &listen_cb,
971  lt);
972  }
973  else
974  GNUNET_free (lt);
975 }
static struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
int shutdown_running
A flag indicating we are already doing a shutdown.
static struct GNUNET_CONTAINER_MultiHashMap * lt_map
ListenTasks (map from socket to struct ListenTask)
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
void * GNUNET_CONTAINER_multihashmap_get(const struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key)
Given a key find a value in the map matching the key.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multipeermap_remove(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, const void *value)
Remove the given key-value pair from the map.
@ GNUNET_YES
@ GNUNET_NO
Definition: gnunet_common.h:98
@ GNUNET_SYSERR
Definition: gnunet_common.h:97
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_ERROR
#define GNUNET_free(ptr)
Wrapper around free.
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:508
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1023
void GNUNET_PEERSTORE_store_cancel(struct GNUNET_PEERSTORE_StoreContext *sc)
Cancel a store request.
void GNUNET_PEERSTORE_iterate_cancel(struct GNUNET_PEERSTORE_IterateContext *ic)
Cancel an iterate request Please do not call after the iterate request is done.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:957
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
void GNUNET_TRANSPORT_communicator_mq_del(struct GNUNET_TRANSPORT_QueueHandle *qh)
Notify transport service that an MQ became unavailable due to a disconnect or timeout.
A 512-bit hashcode.

References 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_get_fd(), 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, listen_cb(), ListenTask::listen_sock, ListenTask::listen_task, lt_map, queue(), queue_map, shutdown_running, and stats.

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

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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_secretsecret for HMAC calculation
bufbuffer to MAC
buf_sizenumber of bytes in buf
smac[out]where to write the HMAC

Definition at line 987 of file gnunet-communicator-tcp.c.

991 {
992  struct GNUNET_HashCode mac;
993 
994  GNUNET_CRYPTO_hmac_raw (hmac_secret,
995  sizeof(struct GNUNET_HashCode),
996  buf,
997  buf_size,
998  &mac);
999  /* truncate to `struct GNUNET_ShortHashCode` */
1000  memcpy (smac, &mac, sizeof(struct GNUNET_ShortHashCode));
1001  /* ratchet hmac key */
1002  GNUNET_CRYPTO_hash (hmac_secret,
1003  sizeof(struct GNUNET_HashCode),
1004  hmac_secret);
1005 }
static char buf[2048]
void GNUNET_CRYPTO_hmac_raw(const void *key, size_t key_len, const void *plaintext, size_t plaintext_len, struct GNUNET_HashCode *hmac)
Calculate HMAC of a message (RFC 2104) TODO: Shouldn't this be the standard hmac function and the abo...
Definition: crypto_hash.c:299
A 256-bit hashcode.

References buf, GNUNET_CRYPTO_hash(), and GNUNET_CRYPTO_hmac_raw().

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

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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
queuequeue to shut down nicely

Definition at line 1015 of file gnunet-communicator-tcp.c.

1016 {
1017  struct TCPFinish fin;
1018 
1019  memset (&fin, 0, sizeof(fin));
1020  fin.header.size = htons (sizeof(fin));
1021  fin.header.type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH);
1022  calculate_hmac (&queue->out_hmac, &fin, sizeof(fin), &fin.hmac);
1023  /* if there is any message left in pwrite_buf, we
1024  overwrite it (possibly dropping the last message
1025  from CORE hard here) */
1026  memcpy (queue->pwrite_buf, &fin, sizeof(fin));
1027  queue->pwrite_off = sizeof(fin);
1028  /* This flag will ensure that #queue_write() no longer
1029  notifies CORE about the possibility of sending
1030  more data, and that #queue_write() will call
1031  #queue_destroy() once the @c fin was fully written. */
1032  queue->finishing = GNUNET_YES;
1033 }
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.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH
TCP communicator end of stream.

References calculate_hmac(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH, GNUNET_YES, TCPFinish::header, TCPFinish::hmac, queue(), 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().

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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
queuequeue for which the timeout should be rescheduled

Definition at line 1044 of file gnunet-communicator-tcp.c.

1045 {
1046  queue->timeout =
1048 }
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don't receive messages from the peer?

References GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_TIME_relative_to_absolute(), and queue().

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

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◆ queue_read()

static void queue_read ( void *  cls)
static

Queue read task.

If we hit the timeout, disconnect it

Parameters
clsthe struct Queue * to disconnect

Definition at line 1902 of file gnunet-communicator-tcp.c.

1903 {
1904  struct Queue *queue = cls;
1905  struct GNUNET_TIME_Relative left;
1906  ssize_t rcvd;
1907 
1908  queue->read_task = NULL;
1909  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
1910  &queue->cread_buf[queue->cread_off],
1911  BUF_SIZE - queue->cread_off);
1913  "Received %lu bytes from TCP queue\n", rcvd);
1915  "transport",
1916  "Received %lu bytes from TCP queue\n", rcvd);
1917  if (-1 == rcvd)
1918  {
1919  if ((EAGAIN != errno) && (EINTR != errno))
1920  {
1922  queue_finish (queue);
1923  return;
1924  }
1925  /* try again */
1926  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
1927  queue->read_task =
1929  return;
1930  }
1931  if (0 != rcvd)
1933  queue->cread_off += rcvd;
1934  while ((queue->pread_off < sizeof(queue->pread_buf)) &&
1935  (queue->cread_off > 0))
1936  {
1937  size_t max = GNUNET_MIN (sizeof(queue->pread_buf) - queue->pread_off,
1938  queue->cread_off);
1939  size_t done;
1940  size_t total;
1941  size_t old_pread_off = queue->pread_off;
1942 
1943  GNUNET_assert (0 ==
1944  gcry_cipher_decrypt (queue->in_cipher,
1945  &queue->pread_buf[queue->pread_off],
1946  max,
1947  queue->cread_buf,
1948  max));
1949  queue->pread_off += max;
1950  total = 0;
1951  while (0 != (done = try_handle_plaintext (queue)))
1952  {
1953  /* 'done' bytes of plaintext were used, shift buffer */
1954  GNUNET_assert (done <= queue->pread_off);
1955  /* NOTE: this memmove() could possibly sometimes be
1956  avoided if we pass 'total' into try_handle_plaintext()
1957  and use it at an offset into the buffer there! */
1958  memmove (queue->pread_buf,
1959  &queue->pread_buf[done],
1960  queue->pread_off - done);
1961  queue->pread_off -= done;
1962  total += done;
1963  /* The last plaintext was a rekey, abort for now */
1964  if (GNUNET_YES == queue->rekeyed)
1965  break;
1966  }
1967  /* when we encounter a rekey message, the decryption above uses the
1968  wrong key for everything after the rekey; in that case, we have
1969  to re-do the decryption at 'total' instead of at 'max'.
1970  However, we have to take into account that the plaintext buffer may have
1971  already contained data and not jumped too far ahead in the ciphertext.
1972  If there is no rekey and the last message is incomplete (max > total),
1973  it is safe to keep the decryption so we shift by 'max' */
1974  if (GNUNET_YES == queue->rekeyed)
1975  {
1976  max = total - old_pread_off;
1977  queue->rekeyed = GNUNET_NO;
1978  queue->pread_off = 0;
1979  }
1980  memmove (queue->cread_buf, &queue->cread_buf[max], queue->cread_off - max);
1981  queue->cread_off -= max;
1982  }
1983  if (BUF_SIZE == queue->cread_off)
1984  return; /* buffer full, suspend reading */
1985  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
1986  if (0 != left.rel_value_us)
1987  {
1988  if (max_queue_length > queue->backpressure)
1989  {
1990  /* continue reading */
1991  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
1992  queue->read_task =
1994  }
1995  return;
1996  }
1998  "Queue %p was idle for %s, disconnecting\n",
1999  queue,
2002  GNUNET_YES));
2003  queue_finish (queue);
2004 }
static void done()
static void queue_finish(struct Queue *queue)
Append a 'finish' message to the outgoing transmission.
static size_t try_handle_plaintext(struct Queue *queue)
Test if we have received a full message in plaintext.
#define BUF_SIZE
Size of our IO buffers for ciphertext data.
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
static unsigned long long max_queue_length
Maximum queue length before we stop reading towards the transport service.
static void queue_read(void *cls)
Queue read task.
#define GNUNET_MIN(a, b)
void GNUNET_log_from_nocheck(enum GNUNET_ErrorType kind, const char *comp, const char *message,...) __attribute__((format(printf
Log function that specifies an alternative component.
ssize_t GNUNET_NETWORK_socket_recv(const struct GNUNET_NETWORK_Handle *desc, void *buffer, size_t length)
Read data from a connected socket (always non-blocking).
Definition: network.c:731
struct GNUNET_TIME_Relative GNUNET_TIME_absolute_get_remaining(struct GNUNET_TIME_Absolute future)
Given a timestamp in the future, how much time remains until then?
Definition: time.c:404
const char * GNUNET_STRINGS_relative_time_to_string(struct GNUNET_TIME_Relative delta, int do_round)
Give relative time in human-readable fancy format.
Definition: strings.c:570
#define max(x, y)
Time for relative time used by GNUnet, in microseconds.
Handle for a queue.

References BUF_SIZE, done(), GNUNET_assert, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_log_from_nocheck(), 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, max, max_queue_length, queue(), queue_finish(), GNUNET_TIME_Relative::rel_value_us, reschedule_queue_timeout(), and try_handle_plaintext().

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

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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
clsa struct Queue * where the message originally came from
successGNUNET_OK on success

Definition at line 1068 of file gnunet-communicator-tcp.c.

1069 {
1070  struct Queue *queue = cls;
1071  if (GNUNET_OK != success)
1073  "# messages lost in communicator API towards CORE",
1074  1,
1075  GNUNET_NO);
1076  if (NULL == queue)
1077  return;
1078 
1080  "backpressure %u\n",
1081  queue->backpressure);
1082 
1083  queue->backpressure--;
1084  /* handle deferred queue destruction */
1085  if ((queue->destroyed) && (0 == queue->backpressure))
1086  {
1087  GNUNET_free (queue);
1088  return;
1089  }
1090  else if (GNUNET_YES != queue->destroyed)
1091  {
1093  /* possibly unchoke reading, now that CORE made progress */
1094  if (NULL == queue->read_task)
1095  queue->read_task =
1097  queue->timeout),
1098  queue->sock,
1099  &queue_read,
1100  queue);
1101  }
1102 }
@ GNUNET_OK
Definition: gnunet_common.h:99
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.

References 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(), reschedule_queue_timeout(), and stats.

Referenced by pass_plaintext_to_core().

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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
queuethe queue that received the plaintext
plaintextthe plaintext that was received
plaintext_lennumber of bytes of plaintext received

Definition at line 1115 of file gnunet-communicator-tcp.c.

1118 {
1119  const struct GNUNET_MessageHeader *hdr = plaintext;
1120  int ret;
1121 
1123  "pass message from %s to core\n",
1124  GNUNET_i2s (&queue->target));
1125 
1126  if (ntohs (hdr->size) != plaintext_len)
1127  {
1128  /* NOTE: If we ever allow multiple CORE messages in one
1129  BOX, this will have to change! */
1130  GNUNET_break (0);
1131  return;
1132  }
1134  &queue->target,
1135  hdr,
1138  queue);
1140  "passed to core\n");
1141  if (GNUNET_OK == ret)
1142  queue->backpressure++;
1143  GNUNET_break (GNUNET_NO != ret); /* backpressure not working!? */
1144  if (GNUNET_SYSERR == ret)
1146  "# bytes lost due to CORE not running",
1147  plaintext_len,
1148  GNUNET_NO);
1149 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define ADDRESS_VALIDITY_PERIOD
How long do we believe our addresses to remain up (before the other peer should revalidate).
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
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.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
int GNUNET_TRANSPORT_communicator_receive(struct GNUNET_TRANSPORT_CommunicatorHandle *handle, const struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *msg, struct GNUNET_TIME_Relative expected_addr_validity, GNUNET_TRANSPORT_MessageCompletedCallback cb, void *cb_cls)
Notify transport service that the communicator has received a message.
Header for all communications.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.

References ADDRESS_VALIDITY_PERIOD, ch, core_read_finished_cb(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_TRANSPORT_communicator_receive(), queue(), ret, GNUNET_MessageHeader::size, and stats.

Referenced by try_handle_plaintext().

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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
dhshared secret
piddecrypting peer's identity
cipher[out]cipher to initialize
hmac_key[out]HMAC key to initialize

Definition at line 1162 of file gnunet-communicator-tcp.c.

1166 {
1167  char key[256 / 8];
1168  char ctr[128 / 8];
1169 
1170  GNUNET_assert (0 == gcry_cipher_open (cipher,
1171  GCRY_CIPHER_AES256 /* low level: go for speed */,
1172  GCRY_CIPHER_MODE_CTR,
1173  0 /* flags */));
1175  sizeof(key),
1176  "TCP-key",
1177  strlen ("TCP-key"),
1178  dh,
1179  sizeof(*dh),
1180  pid,
1181  sizeof(*pid),
1182  NULL,
1183  0));
1184  GNUNET_assert (0 == gcry_cipher_setkey (*cipher, key, sizeof(key)));
1186  sizeof(ctr),
1187  "TCP-ctr",
1188  strlen ("TCP-ctr"),
1189  dh,
1190  sizeof(*dh),
1191  pid,
1192  sizeof(*pid),
1193  NULL,
1194  0));
1195  gcry_cipher_setctr (*cipher, ctr, sizeof(ctr));
1197  GNUNET_CRYPTO_kdf (hmac_key,
1198  sizeof(struct GNUNET_HashCode),
1199  "TCP-hmac",
1200  strlen ("TCP-hmac"),
1201  dh,
1202  sizeof(*dh),
1203  pid,
1204  sizeof(*pid),
1205  NULL,
1206  0));
1207 }
struct GNUNET_HashCode key
The key used in the DHT.
static struct GNUNET_PeerIdentity pid
Identity of the peer we transmit to / connect to.
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_kdf(void *result, size_t out_len, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_kdf.c:69

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

Referenced by setup_in_cipher(), and setup_out_cipher().

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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
clsQueue context the store operation was executed.
successStore operation was successful (GNUNET_OK) or not.

Definition at line 1216 of file gnunet-communicator-tcp.c.

1217 {
1218  struct Queue *queue = cls;
1219  if (GNUNET_OK != success)
1220  {
1222  "Failed to store rekey monotonic time in PEERSTORE!\n");
1223  }
1224  queue->rekey_monotime_sc = NULL;
1225 }

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, and queue().

Referenced by rekey_monotime_cb().

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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
clsQueue context the store operation was executed.
recordThe record found or NULL if there is no record left.
emsgMessage from peerstore.

Definition at line 1236 of file gnunet-communicator-tcp.c.

1239 {
1240  struct Queue *queue = cls;
1241  struct GNUNET_TIME_AbsoluteNBO *mtbe;
1242  struct GNUNET_TIME_Absolute mt;
1243  const struct GNUNET_PeerIdentity *pid;
1244  struct GNUNET_TIME_AbsoluteNBO *rekey_monotonic_time;
1245 
1246  (void) emsg;
1247 
1248  rekey_monotonic_time = &queue->rekey_monotonic_time;
1249  pid = &queue->target;
1250  if (NULL == record)
1251  {
1252  queue->rekey_monotime_get = NULL;
1253  return;
1254  }
1255  if (sizeof(*mtbe) != record->value_size)
1256  {
1257  GNUNET_break (0);
1258  return;
1259  }
1260  mtbe = record->value;
1261  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
1262  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
1263  queue->rekey_monotonic_time).abs_value_us)
1264  {
1266  "Queue from %s dropped, rekey monotime in the past\n",
1267  GNUNET_i2s (&queue->target));
1268  GNUNET_break (0);
1269  queue_finish (queue);
1270  return;
1271  }
1272  queue->rekey_monotime_sc = GNUNET_PEERSTORE_store (peerstore,
1273  "transport_tcp_communicator",
1274  pid,
1276  rekey_monotonic_time,
1277  sizeof(*
1278  rekey_monotonic_time),
1282  queue);
1283 }
static struct GNUNET_PEERSTORE_Handle * peerstore
Database for peer's HELLOs.
static void rekey_monotime_store_cb(void *cls, int success)
Callback called when peerstore store operation for rekey monotime value is finished.
static void record(void *cls, size_t data_size, const void *data)
Process recorded audio data.
struct GNUNET_PEERSTORE_StoreContext * GNUNET_PEERSTORE_store(struct GNUNET_PEERSTORE_Handle *h, const char *sub_system, const struct GNUNET_PeerIdentity *peer, const char *key, const void *value, size_t size, struct GNUNET_TIME_Absolute expiry, enum GNUNET_PEERSTORE_StoreOption options, GNUNET_PEERSTORE_Continuation cont, void *cont_cls)
Store a new entry in the PEERSTORE.
#define GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_REKEY
Key used to store sender's monotonic time from rekey message.
@ GNUNET_PEERSTORE_STOREOPTION_REPLACE
Delete any previous values for the given key before storing the given value.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:736
#define GNUNET_TIME_UNIT_FOREVER_ABS
Constant used to specify "forever".
The identity of the host (wraps the signing key of the peer).
Time for absolute time used by GNUnet, in microseconds and in network byte order.
Time for absolute times used by GNUnet, in microseconds.
uint64_t abs_value_us
The actual value.

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, peerstore, pid, queue(), queue_finish(), record(), and rekey_monotime_store_cb().

Referenced by do_rekey().

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

Definition at line 1293 of file gnunet-communicator-tcp.c.

1295 {
1296  struct GNUNET_HashCode dh;
1297 
1298  GNUNET_CRYPTO_eddsa_ecdh (my_private_key, ephemeral, &dh);
1299  setup_cipher (&dh, &my_identity, &queue->in_cipher, &queue->in_hmac);
1300 }
static struct GNUNET_PeerIdentity my_identity
Our public key.
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.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_ecdh(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EcdhePublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a ECDH public key and a private EdDSA key.
Definition: crypto_ecc.c:739

References GNUNET_CRYPTO_eddsa_ecdh(), my_identity, my_private_key, queue(), and setup_cipher().

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

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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
queuethe queue rekey was received on
rekeythe rekey message

Definition at line 1312 of file gnunet-communicator-tcp.c.

1313 {
1314  struct TcpRekeySignature thp;
1315 
1317  thp.purpose.size = htonl (sizeof(thp));
1319  "do_rekey size %u\n",
1320  thp.purpose.size);
1321  thp.sender = queue->target;
1323  "sender %s\n",
1324  GNUNET_p2s (&thp.sender.public_key));
1326  "sender %s\n",
1327  GNUNET_p2s (&queue->target.public_key));
1328  thp.receiver = my_identity;
1330  "receiver %s\n",
1331  GNUNET_p2s (&thp.receiver.public_key));
1332  thp.ephemeral = rekey->ephemeral;
1334  "ephemeral %s\n",
1335  GNUNET_e2s (&thp.ephemeral));
1336  thp.monotonic_time = rekey->monotonic_time;
1338  "time %s\n",
1340  GNUNET_TIME_absolute_ntoh (thp.monotonic_time)));
1341  GNUNET_assert (ntohl ((&thp)->purpose.size) == sizeof (*(&thp)));
1342  if (GNUNET_OK !=
1345  &thp,
1346  &rekey->sender_sig,
1347  &queue->target.public_key))
1348  {
1349  GNUNET_break (0);
1350  queue_finish (queue);
1351  return;
1352  }
1353  queue->rekey_monotonic_time = rekey->monotonic_time;
1354  queue->rekey_monotime_get = GNUNET_PEERSTORE_iterate (peerstore,
1355  "transport_tcp_communicator",
1356  &queue->target,
1359  queue);
1360  gcry_cipher_close (queue->in_cipher);
1361  queue->rekeyed = GNUNET_YES;
1362  setup_in_cipher (&rekey->ephemeral, queue);
1363 }
#define GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_REKEY
Signature used by TCP communicator rekey.
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...
static void setup_in_cipher(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
Setup cipher of queue for decryption.
#define GNUNET_CRYPTO_eddsa_verify(purp, ps, sig, pub)
Verify EdDSA signature.
const char * GNUNET_e2s(const struct GNUNET_CRYPTO_EcdhePublicKey *p)
Convert a public key value to a string (for printing debug messages).
const char * GNUNET_p2s(const struct GNUNET_CRYPTO_EddsaPublicKey *p)
Convert a public key value to a string (for printing debug messages).
struct GNUNET_PEERSTORE_IterateContext * GNUNET_PEERSTORE_iterate(struct GNUNET_PEERSTORE_Handle *h, const char *sub_system, const struct GNUNET_PeerIdentity *peer, const char *key, GNUNET_PEERSTORE_Processor callback, void *callback_cls)
Iterate over records matching supplied key information.
const char * GNUNET_STRINGS_absolute_time_to_string(struct GNUNET_TIME_Absolute t)
Like asctime, except for GNUnet time.
Definition: strings.c:617
uint32_t size
How many bytes does this signature sign? (including this purpose header); in network byte order (!...
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
New ephemeral key.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender's signature of type GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_REKEY.
Signature we use to verify that the ephemeral key was really chosen by the specified sender.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_REKEY.

References TCPRekey::ephemeral, TcpRekeySignature::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_PURPOSE_COMMUNICATOR_TCP_REKEY, GNUNET_STRINGS_absolute_time_to_string(), GNUNET_TIME_absolute_ntoh(), GNUNET_YES, TcpRekeySignature::monotonic_time, TCPRekey::monotonic_time, my_identity, peerstore, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpRekeySignature::purpose, queue(), queue_finish(), TcpRekeySignature::receiver, rekey_monotime_cb(), TcpRekeySignature::sender, TCPRekey::sender_sig, setup_in_cipher(), and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by try_handle_plaintext().

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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
clsQueue context the store operation was executed.
successStore operation was successful (GNUNET_OK) or not.

Definition at line 1372 of file gnunet-communicator-tcp.c.

1373 {
1374  struct Queue *queue = cls;
1375 
1376  if (GNUNET_OK != success)
1377  {
1379  "Failed to store handshake ack monotonic time in PEERSTORE!\n");
1380  }
1381  queue->handshake_ack_monotime_sc = NULL;
1382 }

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, and queue().

Referenced by handshake_ack_monotime_cb().

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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
clsQueue context the store operation was executed.
recordThe record found or NULL if there is no record left.
emsgMessage from peerstore.

Definition at line 1393 of file gnunet-communicator-tcp.c.

1396 {
1397  struct Queue *queue = cls;
1398  struct GNUNET_TIME_AbsoluteNBO *mtbe;
1399  struct GNUNET_TIME_Absolute mt;
1400  const struct GNUNET_PeerIdentity *pid;
1401  struct GNUNET_TIME_AbsoluteNBO *handshake_ack_monotonic_time;
1402 
1403  (void) emsg;
1404 
1405  handshake_ack_monotonic_time = &queue->handshake_ack_monotonic_time;
1406  pid = &queue->target;
1407  if (NULL == record)
1408  {
1409  queue->handshake_ack_monotime_get = NULL;
1410  return;
1411  }
1412  if (sizeof(*mtbe) != record->value_size)
1413  {
1414  GNUNET_break (0);
1415  return;
1416  }
1417  mtbe = record->value;
1418  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
1419  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
1420  queue->handshake_ack_monotonic_time).abs_value_us)
1421  {
1423  "Queue from %s dropped, handshake ack monotime in the past\n",
1424  GNUNET_i2s (&queue->target));
1425  GNUNET_break (0);
1426  queue_finish (queue);
1427  return;
1428  }
1429  queue->handshake_ack_monotime_sc =
1431  "transport_tcp_communicator",
1432  pid,
1434  handshake_ack_monotonic_time,
1435  sizeof(*handshake_ack_monotonic_time),
1438  &
1440  queue);
1441 }
static void handshake_ack_monotime_store_cb(void *cls, int success)
Callback called when peerstore store operation for handshake ack monotime value is finished.
#define GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE_ACK
Key used to store sender's monotonic time from handshake ack message.

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, handshake_ack_monotime_store_cb(), peerstore, pid, queue(), queue_finish(), and record().

Referenced by try_handle_plaintext().

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◆ send_challenge()

static void send_challenge ( struct GNUNET_CRYPTO_ChallengeNonceP  challenge,
struct Queue queue 
)
static

Sending challenge with TcpConfirmationAck back to sender of ephemeral key.

Parameters
tcThe TCPConfirmation originally send.
queueThe queue context.

Definition at line 1451 of file gnunet-communicator-tcp.c.

1453 {
1454  struct TCPConfirmationAck tca;
1455  struct TcpHandshakeAckSignature thas;
1456 
1458  "transport",
1459  "sending challenge\n");
1460 
1461  tca.header.type = ntohs (
1463  tca.header.size = ntohs (sizeof(tca));
1464  tca.challenge = challenge;
1465  tca.sender = my_identity;
1466  tca.monotonic_time =
1468  thas.purpose.purpose = htonl (
1470  thas.purpose.size = htonl (sizeof(thas));
1471  thas.sender = my_identity;
1472  thas.receiver = queue->target;
1473  thas.monotonic_time = tca.monotonic_time;
1474  thas.challenge = tca.challenge;
1476  &thas,
1477  &tca.sender_sig);
1478  GNUNET_assert (0 ==
1479  gcry_cipher_encrypt (queue->out_cipher,
1480  &queue->cwrite_buf[queue->cwrite_off],
1481  sizeof(tca),
1482  &tca,
1483  sizeof(tca)));
1484  queue->cwrite_off += sizeof(tca);
1486  "transport",
1487  "sending challenge done\n");
1488 }
#define GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_HANDSHAKE_ACK
Signature by a peer sending back the nonce received at initial handshake.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
#define GNUNET_CRYPTO_eddsa_sign(priv, ps, sig)
EdDSA sign a given block.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK
TCP communicator confirmation ack.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get_monotonic(const struct GNUNET_CONFIGURATION_Handle *cfg)
Obtain the current time and make sure it is monotonically increasing.
Definition: time.c:859
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:637
Ack for the encrypted continuation of TCP initial handshake.
Signature we use to verify that the ack from the receiver of the ephemeral key was really send by the...
struct GNUNET_CRYPTO_ChallengeNonceP challenge
Challenge value used to protect against replay attack, if there is no stored monotonic time value.

References cfg, TcpHandshakeAckSignature::challenge, TCPConfirmationAck::challenge, GNUNET_assert, GNUNET_CRYPTO_eddsa_sign, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log_from_nocheck(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_CONFIRMATION_ACK, GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_HANDSHAKE_ACK, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), TCPConfirmationAck::header, TCPConfirmationAck::monotonic_time, TcpHandshakeAckSignature::monotonic_time, my_identity, my_private_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeAckSignature::purpose, queue(), TcpHandshakeAckSignature::receiver, TCPConfirmationAck::sender, TcpHandshakeAckSignature::sender, TCPConfirmationAck::sender_sig, GNUNET_MessageHeader::size, GNUNET_CRYPTO_EccSignaturePurpose::size, and GNUNET_MessageHeader::type.

Referenced by queue_read_kx(), and try_handle_plaintext().

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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
queuequeue to setup outgoing (encryption) cipher for

Definition at line 1498 of file gnunet-communicator-tcp.c.

1499 {
1500  struct GNUNET_HashCode dh;
1501 
1502  GNUNET_CRYPTO_ecdh_eddsa (&queue->ephemeral, &queue->target.public_key, &dh);
1503  /* we don't need the private key anymore, drop it! */
1504  memset (&queue->ephemeral, 0, sizeof(queue->ephemeral));
1505  setup_cipher (&dh, &queue->target, &queue->out_cipher, &queue->out_hmac);
1507  queue->rekey_left_bytes =
1509 }
static struct GNUNET_TIME_Relative rekey_interval
The rekey interval.
#define REKEY_MAX_BYTES
How often do we rekey based on number of bytes transmitted? (additionally randomized).
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Generate a random unsigned 64-bit value.
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_ecdh_eddsa(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, const struct GNUNET_CRYPTO_EddsaPublicKey *pub, struct GNUNET_HashCode *key_material)
Derive key material from a EdDSA public key and a private ECDH key.
Definition: crypto_ecc.c:779
@ GNUNET_CRYPTO_QUALITY_WEAK
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).

References GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u64(), GNUNET_TIME_relative_to_absolute(), queue(), rekey_interval, REKEY_MAX_BYTES, and setup_cipher().

Referenced by inject_rekey(), and start_initial_kx_out().

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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
queuequeue to perform rekeying on

Definition at line 1519 of file gnunet-communicator-tcp.c.

1520 {
1521  struct TCPRekey rekey;
1522  struct TcpRekeySignature thp;
1523 
1524  GNUNET_assert (0 == queue->pwrite_off);
1525  memset (&rekey, 0, sizeof(rekey));
1526  GNUNET_CRYPTO_ecdhe_key_create (&queue->ephemeral);
1527  rekey.header.type = ntohs (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY);
1528  rekey.header.size = ntohs (sizeof(rekey));
1529  GNUNET_CRYPTO_ecdhe_key_get_public (&queue->ephemeral, &rekey.ephemeral);
1530  rekey.monotonic_time =
1532  thp.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_REKEY);
1533  thp.purpose.size = htonl (sizeof(thp));
1535  "inject_rekey size %u\n",
1536  thp.purpose.size);
1537  thp.sender = my_identity;
1539  "sender %s\n",
1540  GNUNET_p2s (&thp.sender.public_key));
1541  thp.receiver = queue->target;
1543  "receiver %s\n",
1544  GNUNET_p2s (&thp.receiver.public_key));
1545  thp.ephemeral = rekey.ephemeral;
1547  "ephemeral %s\n",
1548  GNUNET_e2s (&thp.ephemeral));
1549  thp.monotonic_time = rekey.monotonic_time;
1551  "time %s\n",
1553  GNUNET_TIME_absolute_ntoh (thp.monotonic_time)));
1555  &thp,
1556  &rekey.sender_sig);
1557  calculate_hmac (&queue->out_hmac, &rekey, sizeof(rekey), &rekey.hmac);
1558  /* Encrypt rekey message with 'old' cipher */
1559  GNUNET_assert (0 ==
1560  gcry_cipher_encrypt (queue->out_cipher,
1561  &queue->cwrite_buf[queue->cwrite_off],
1562  sizeof(rekey),
1563  &rekey,
1564  sizeof(rekey)));
1565  queue->cwrite_off += sizeof(rekey);
1566  /* Setup new cipher for successive messages */
1567  gcry_cipher_close (queue->out_cipher);
1569 }
static void setup_out_cipher(struct Queue *queue)
Setup cipher for outgoing data stream based on target and our ephemeral private key.
void GNUNET_CRYPTO_ecdhe_key_create(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:435
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:213
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY
TCP communicator rekey message.
TCP rekey message box.

References calculate_hmac(), cfg, TcpRekeySignature::ephemeral, TCPRekey::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_PURPOSE_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, my_private_key, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpRekeySignature::purpose, queue(), TcpRekeySignature::receiver, TcpRekeySignature::sender, TCPRekey::sender_sig, setup_out_cipher(), GNUNET_MessageHeader::size, GNUNET_CRYPTO_EccSignaturePurpose::size, and GNUNET_MessageHeader::type.

Referenced by queue_write().

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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
clsa struct Queue

Definition at line 1579 of file gnunet-communicator-tcp.c.

1580 {
1581  struct Queue *queue = cls;
1582  ssize_t sent;
1583  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "In queue write\n");
1584  queue->write_task = NULL;
1585  if (0 != queue->cwrite_off)
1586  {
1587  sent = GNUNET_NETWORK_socket_send (queue->sock,
1588  queue->cwrite_buf,
1589  queue->cwrite_off);
1591  "Sent %lu bytes to TCP queue\n", sent);
1592  if ((-1 == sent) && (EAGAIN != errno) && (EINTR != errno))
1593  {
1595  queue_destroy (queue);
1596  return;
1597  }
1598  if (sent > 0)
1599  {
1600  size_t usent = (size_t) sent;
1601  queue->cwrite_off -= usent;
1602  memmove (queue->cwrite_buf,
1603  &queue->cwrite_buf[usent],
1604  queue->cwrite_off);
1606  }
1607  }
1608  /* can we encrypt more? (always encrypt full messages, needed
1609  such that #mq_cancel() can work!) */
1610  if ((0 < queue->rekey_left_bytes) &&
1611  (queue->pwrite_off > 0) &&
1612  (queue->cwrite_off + queue->pwrite_off <= BUF_SIZE))
1613  {
1615  "Encrypting %lu bytes\n", queue->pwrite_off);
1616  GNUNET_assert (0 ==
1617  gcry_cipher_encrypt (queue->out_cipher,
1618  &queue->cwrite_buf[queue->cwrite_off],
1619  queue->pwrite_off,
1620  queue->pwrite_buf,
1621  queue->pwrite_off));
1622  if (queue->rekey_left_bytes > queue->pwrite_off)
1623  queue->rekey_left_bytes -= queue->pwrite_off;
1624  else
1625  queue->rekey_left_bytes = 0;
1626  queue->cwrite_off += queue->pwrite_off;
1627  queue->pwrite_off = 0;
1628  }
1629  // if ((-1 != unverified_size)&& ((0 == queue->pwrite_off) &&
1630  if (((0 == queue->pwrite_off) &&
1631  ((0 == queue->rekey_left_bytes) ||
1632  (0 ==
1634  queue->rekey_time).rel_value_us))))
1635  {
1636  inject_rekey (queue);
1637  }
1638  if ((0 == queue->pwrite_off) && (! queue->finishing) &&
1639  (GNUNET_YES == queue->mq_awaits_continue))
1640  {
1641  queue->mq_awaits_continue = GNUNET_NO;
1643  }
1644  /* did we just finish writing 'finish'? */
1645  if ((0 == queue->cwrite_off) && (GNUNET_YES == queue->finishing))
1646  {
1648  "Finishing queue\n");
1649  queue_destroy (queue);
1650  return;
1651  }
1652  /* do we care to write more? */
1653  if ((0 < queue->cwrite_off) || (0 < queue->pwrite_off))
1654  queue->write_task =
1656  queue->sock,
1657  &queue_write,
1658  queue);
1659 }
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 fai...
static void inject_rekey(struct Queue *queue)
Inject a struct TCPRekey message into the queue's plaintext buffer.
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
void GNUNET_MQ_impl_send_continue(struct GNUNET_MQ_Handle *mq)
Call the send implementation for the next queued message, if any.
Definition: mq.c:423
ssize_t GNUNET_NETWORK_socket_send(const struct GNUNET_NETWORK_Handle *desc, const void *buffer, size_t length)
Send data (always non-blocking).
Definition: network.c:760
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_write_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1573
uint64_t rel_value_us
The actual value.

References BUF_SIZE, 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(), queue_destroy(), GNUNET_TIME_Relative::rel_value_us, and reschedule_queue_timeout().

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

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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
queuequeue to process inbound plaintext for
Returns
number of bytes of plaintext handled, 0 for none

Definition at line 1670 of file gnunet-communicator-tcp.c.

1671 {
1672  const struct GNUNET_MessageHeader *hdr =
1673  (const struct GNUNET_MessageHeader *) queue->pread_buf;
1674  const struct TCPConfirmationAck *tca = (const struct
1675  TCPConfirmationAck *) queue->pread_buf;
1676  const struct TCPBox *box = (const struct TCPBox *) queue->pread_buf;
1677  const struct TCPRekey *rekey = (const struct TCPRekey *) queue->pread_buf;
1678  const struct TCPFinish *fin = (const struct TCPFinish *) queue->pread_buf;
1679  struct TCPRekey rekeyz;
1680  struct TCPFinish finz;
1681  struct GNUNET_ShortHashCode tmac;
1682  uint16_t type;
1683  size_t size = 0; /* make compiler happy */
1684  struct TcpHandshakeAckSignature thas;
1685  const struct GNUNET_CRYPTO_ChallengeNonceP challenge = queue->challenge;
1686 
1688  "try handle plaintext!\n");
1689 
1690  if ((sizeof(*hdr) > queue->pread_off))
1691  {
1693  "Handling plaintext, not even a header!\n");
1694  return 0; /* not even a header */
1695  }
1696 
1698  {
1700  "Already received data of size %lu bigger than KX size %lu!\n",
1703  GNUNET_break_op (0);
1704  queue_finish (queue);
1705  return 0;
1706  }
1707 
1708  type = ntohs (hdr->type);
1709  switch (type)
1710  {
1713  "start processing ack\n");
1714  if (sizeof(*tca) > queue->pread_off)
1715  {
1717  "Handling plaintext size of tca greater than pread offset.\n");
1718  return 0;
1719  }
1720  if (ntohs (hdr->size) != sizeof(*tca))
1721  {
1723  "Handling plaintext size does not match message type.\n");
1724  GNUNET_break_op (0);
1725  queue_finish (queue);
1726  return 0;
1727  }
1728 
1729  thas.purpose.purpose = htonl (
1731  thas.purpose.size = htonl (sizeof(thas));
1732  thas.sender = tca->sender;
1733  thas.receiver = my_identity;
1734  thas.monotonic_time = tca->monotonic_time;
1735  thas.challenge = tca->challenge;
1736 
1739  &thas,
1740  &tca->sender_sig,
1741  &tca->sender.public_key))
1742  {
1744  "Verification of signature failed!\n");
1745  GNUNET_break (0);
1746  queue_finish (queue);
1747  return 0;
1748  }
1749  if (0 != GNUNET_memcmp (&tca->challenge, &challenge))
1750  {
1752  "Challenge in TCPConfirmationAck not correct!\n");
1753  GNUNET_break (0);
1754  queue_finish (queue);
1755  return 0;
1756  }
1757 
1758  queue->handshake_ack_monotime_get = GNUNET_PEERSTORE_iterate (peerstore,
1759  "transport_tcp_communicator",
1760  &queue->target,
1762  &
1764  queue);
1765 
1767  "Handling plaintext, ack processed!\n");
1768 
1770  {
1771  send_challenge (queue->challenge_received, queue);
1772  queue->write_task =
1774  queue->sock,
1775  &queue_write,
1776  queue);
1777  }
1778 
1779  unverified_size = -1;
1780 
1781  char *foreign_addr;
1782 
1783  switch (queue->address->sa_family)
1784  {
1785  case AF_INET:
1786  GNUNET_asprintf (&foreign_addr,
1787  "%s-%s",
1789  GNUNET_a2s (queue->address, queue->address_len));
1790  break;
1791 
1792  case AF_INET6:
1793  GNUNET_asprintf (&foreign_addr,
1794  "%s-%s",
1796  GNUNET_a2s (queue->address, queue->address_len));
1797  break;
1798 
1799  default:
1800  GNUNET_assert (0);
1801  }
1802 
1804  &queue->target,
1805  foreign_addr,
1806  UINT16_MAX, /* no MTU */
1808  0, /* Priority */
1809  queue->nt,
1810  queue->cs,
1811  queue->mq);
1812 
1813  GNUNET_free (foreign_addr);
1814 
1815  size = ntohs (hdr->size);
1816  break;
1818  /* Special case: header size excludes box itself! */
1819  if (ntohs (hdr->size) + sizeof(struct TCPBox) > queue->pread_off)
1820  return 0;
1821  calculate_hmac (&queue->in_hmac, &box[1], ntohs (hdr->size), &tmac);
1822  if (0 != memcmp (&tmac, &box->hmac, sizeof(tmac)))
1823  {
1824  GNUNET_break_op (0);
1825  queue_finish (queue);
1826  return 0;
1827  }
1828  pass_plaintext_to_core (queue, (const void *) &box[1], ntohs (hdr->size));
1829  size = ntohs (hdr->size) + sizeof(*box);
1831  "Handling plaintext, box processed!\n");
1832  break;
1833 
1835  if (sizeof(*rekey) > queue->pread_off)
1836  return 0;
1837  if (ntohs (hdr->size) != sizeof(*rekey))
1838  {
1839  GNUNET_break_op (0);
1840  queue_finish (queue);
1841  return 0;
1842  }
1843  rekeyz = *rekey;
1844  memset (&rekeyz.hmac, 0, sizeof(rekeyz.hmac));
1845  calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
1846  if (0 != memcmp (&tmac, &rekey->hmac, sizeof(tmac)))
1847  {
1848  GNUNET_break_op (0);
1849  queue_finish (queue);
1850  return 0;
1851  }
1852  do_rekey (queue, rekey);
1853  size = ntohs (hdr->size);
1855  "Handling plaintext, rekey processed!\n");
1856  break;
1857 
1859  if (sizeof(*fin) > queue->pread_off)
1860  return 0;
1861  if (ntohs (hdr->size) != sizeof(*fin))
1862  {
1863  GNUNET_break_op (0);
1864  queue_finish (queue);
1865  return 0;
1866  }
1867  finz = *fin;
1868  memset (&finz.hmac, 0, sizeof(finz.hmac));
1869  calculate_hmac (&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
1870  if (0 != memcmp (&tmac, &fin->hmac, sizeof(tmac)))
1871  {
1872  GNUNET_break_op (0);
1873  queue_finish (queue);
1874  return 0;
1875  }
1876  /* handle FINISH by destroying queue */
1877  queue_destroy (queue);
1879  "Handling plaintext, finish processed!\n");
1880  break;
1881 
1882  default:
1884  "Handling plaintext, nothing processed!\n");
1885  GNUNET_break_op (0);
1886  queue_finish (queue);
1887  return 0;
1888  }
1889  GNUNET_assert (0 != size);
1890  if (-1 != unverified_size)
1891  unverified_size += size;
1892  return size;
1893 }
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.
size_t unverified_size
Size of data received without KX challenge played back.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
#define INITIAL_CORE_KX_SIZE
Size of the initial core key exchange messages.
static void do_rekey(struct Queue *queue, const struct TCPRekey *rekey)
Handle rekey message on queue.
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_A...
static void send_challenge(struct GNUNET_CRYPTO_ChallengeNonceP challenge, struct Queue *queue)
Sending challenge with TcpConfirmationAck back to sender of ephemeral key.
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages).
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX
TCP communicator payload box.
#define GNUNET_TRANSPORT_QUEUE_LENGTH_UNLIMITED
Queue length.
struct GNUNET_TRANSPORT_QueueHandle * GNUNET_TRANSPORT_communicator_mq_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_PeerIdentity *peer, const char *address, uint32_t mtu, uint64_t q_len, uint32_t priority, enum GNUNET_NetworkType nt, enum GNUNET_TRANSPORT_ConnectionStatus cs, struct GNUNET_MQ_Handle *mq)
Notify transport service that a MQ became available due to an "inbound" connection or because the com...
@ GNUNET_TRANSPORT_CS_INBOUND
this is an inbound connection (communicator initiated)
static unsigned int size
Size of the "table".
Definition: peer.c:67
Type of a nonce used for challenges.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
TCP message box.
struct GNUNET_ShortHashCode hmac
HMAC for the following encrypted message.
struct GNUNET_ShortHashCode hmac
HMAC for the following encrypted message.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model

References calculate_hmac(), ch, COMMUNICATOR_ADDRESS_PREFIX, 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_PURPOSE_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(), TCPFinish::hmac, TCPBox::hmac, INITIAL_CORE_KX_SIZE, my_identity, pass_plaintext_to_core(), peerstore, queue(), queue_destroy(), queue_finish(), queue_write(), send_challenge(), GNUNET_MessageHeader::size, size, GNUNET_MessageHeader::type, type, and unverified_size.

Referenced by queue_read().

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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_lenset to the length of the address.
v6The sockaddr_in6 to be converted.
Returns
The struct sockaddr *.

Definition at line 2015 of file gnunet-communicator-tcp.c.

2018 {
2019  struct sockaddr *in;
2020 
2021  v6.sin6_family = AF_INET6;
2022  v6.sin6_port = htons ((uint16_t) port);
2023 #if HAVE_SOCKADDR_IN_SIN_LEN
2024  v6.sin6_len = sizeof(sizeof(struct sockaddr_in6));
2025 #endif
2026  v6.sin6_flowinfo = 0;
2027  v6.sin6_scope_id = 0;
2028  in = GNUNET_memdup (&v6, sizeof(v6));
2029  *sock_len = sizeof(struct sockaddr_in6);
2030 
2031  return in;
2032 }
static uint16_t port
Port number.
Definition: gnunet-bcd.c:147

References GNUNET_memdup, and port.

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

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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_lenset to the length of the address.
v4The sockaddr_in4 to be converted.
Returns
The struct sockaddr *.

Definition at line 2043 of file gnunet-communicator-tcp.c.

2046 {
2047  struct sockaddr *in;
2048 
2049  v4.sin_family = AF_INET;
2050  v4.sin_port = htons ((uint16_t) port);
2051 #if HAVE_SOCKADDR_IN_SIN_LEN
2052  v4.sin_len = sizeof(struct sockaddr_in);
2053 #endif
2054  in = GNUNET_memdup (&v4, sizeof(v4));
2055  *sock_len = sizeof(struct sockaddr_in);
2056  return in;
2057 }

References GNUNET_memdup, and port.

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

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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
bindtobind specification to convert.
Returns
The converted bindto specification.

Definition at line 2067 of file gnunet-communicator-tcp.c.

2068 {
2069  struct PortOnlyIpv4Ipv6 *po;
2070  struct sockaddr_in *i4;
2071  struct sockaddr_in6 *i6;
2072  socklen_t sock_len_ipv4;
2073  socklen_t sock_len_ipv6;
2074 
2075  /* interpreting value as just a PORT number */
2076  if (*port > UINT16_MAX)
2077  {
2079  "BINDTO specification `%s' invalid: value too large for port\n",
2080  bindto);
2081  return NULL;
2082  }
2083 
2084  po = GNUNET_new (struct PortOnlyIpv4Ipv6);
2085 
2086  if ((GNUNET_NO == GNUNET_NETWORK_test_pf (PF_INET6)) ||
2087  (GNUNET_YES ==
2090  "DISABLE_V6")))
2091  {
2092  i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
2093  po->addr_ipv4 = tcp_address_to_sockaddr_numeric_v4 (&sock_len_ipv4, *i4,
2094  *port);
2095  po->addr_len_ipv4 = sock_len_ipv4;
2096  }
2097  else
2098  {
2099 
2100  i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
2101  po->addr_ipv4 = tcp_address_to_sockaddr_numeric_v4 (&sock_len_ipv4, *i4,
2102  *port);
2103  po->addr_len_ipv4 = sock_len_ipv4;
2104 
2105  i6 = GNUNET_malloc (sizeof(struct sockaddr_in6));
2106  po->addr_ipv6 = tcp_address_to_sockaddr_numeric_v6 (&sock_len_ipv6, *i6,
2107  *port);
2108 
2109  po->addr_len_ipv6 = sock_len_ipv6;
2110 
2111  GNUNET_free (i6);
2112  }
2113 
2114  GNUNET_free (i4);
2115 
2116  return po;
2117 }
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
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 *`.
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 *`.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
#define GNUNET_malloc(size)
Wrapper around malloc.
enum GNUNET_GenericReturnValue GNUNET_NETWORK_test_pf(int pf)
Test if the given protocol family is supported by this system.
Definition: network.c:79
In case of port only configuration we like to bind to ipv4 and ipv6 addresses.
struct sockaddr * addr_ipv4
Ipv4 address we like to bind to.
struct sockaddr * addr_ipv6
Ipv6 address we like to bind to.
socklen_t addr_len_ipv6
Length of ipv6 address.
socklen_t addr_len_ipv4
Length of ipv4 address.

References PortOnlyIpv4Ipv6::addr_ipv4, PortOnlyIpv4Ipv6::addr_ipv6, PortOnlyIpv4Ipv6::addr_len_ipv4, PortOnlyIpv4Ipv6::addr_len_ipv6, cfg, 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, port, tcp_address_to_sockaddr_numeric_v4(), and tcp_address_to_sockaddr_numeric_v6().

Referenced by run().

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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
bindtoString we extract the address part from.
Returns
The extracted address string.

Definition at line 2127 of file gnunet-communicator-tcp.c.

2128 {
2129  char *addr;
2130  char *start;
2131  char *token;
2132  char *cp;
2133  char *rest = NULL;
2134  char *res;
2135 
2137  "extract address with bindto %s\n",
2138  bindto);
2139 
2140  if (NULL == bindto)
2142  "bindto is NULL\n");
2143 
2144  cp = GNUNET_strdup (bindto);
2145 
2147  "extract address 2\n");
2148 
2149  start = cp;
2150  if (('[' == *cp) && (']' == cp[strlen (cp) - 1]))
2151  {
2152  start++; /* skip over '['*/
2153  cp[strlen (cp) - 1] = '\0'; /* eat ']'*/
2154  addr = GNUNET_strdup (start);
2155  }
2156  else
2157  {
2158  token = strtok_r (cp, "]", &rest);
2159  if (strlen (bindto) == strlen (token))
2160  {
2161  token = strtok_r (cp, ":", &rest);
2162  addr = GNUNET_strdup (token);
2163  }
2164  else
2165  {
2166  token++;
2167  res = GNUNET_strdup (token);
2168  addr = GNUNET_strdup (res);
2169  }
2170  }
2171 
2173  "tcp address: %s\n",
2174  addr);
2175  GNUNET_free (cp);
2176  return addr;
2177 }
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
static int res
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.

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

Referenced by run(), and tcp_address_to_sockaddr().

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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_portString we extract the port from.
Returns
The extracted port as unsigned int.

Definition at line 2187 of file gnunet-communicator-tcp.c.

2188 {
2189  unsigned int port;
2190  char dummy[2];
2191  char *token;
2192  char *addr;
2193  char *colon;
2194  char *cp;
2195  char *rest = NULL;
2196 
2197  if (NULL != addr_and_port)
2198  {
2199  cp = GNUNET_strdup (addr_and_port);
2200  token = strtok_r (cp, "]", &rest);
2201  if (strlen (addr_and_port) == strlen (token))
2202  {
2203  colon = strrchr (cp, ':');
2204  if (NULL == colon)
2205  {
2206  GNUNET_free (cp);
2207  return 0;
2208  }
2209  addr = colon;
2210  addr++;
2211  }
2212  else
2213  {
2214  token = strtok_r (NULL, "]", &rest);
2215  if (NULL == token)
2216  {
2217  GNUNET_free (cp);
2218  return 0;
2219  }
2220  else
2221  {
2222  addr = token;
2223  addr++;
2224  }
2225  }
2226 
2227 
2228  if (1 == sscanf (addr, "%u%1s", &port, dummy))
2229  {
2230  /* interpreting value as just a PORT number */
2231  if (port > UINT16_MAX)
2232  {
2234  "Port `%u' invalid: value too large for port\n",
2235  port);
2236  GNUNET_free (cp);
2237  return 0;
2238  }
2239  }
2240  else
2241  {
2243  "BINDTO specification invalid: last ':' not followed by number\n");
2244  GNUNET_free (cp);
2245  return 0;
2246  }
2247  GNUNET_free (cp);
2248  }
2249  else
2250  {
2252  "return 0\n");
2253  /* interpret missing port as 0, aka pick any free one */
2254  port = 0;
2255  }
2256 
2257  return port;
2258 }
static struct in_addr dummy
Target "dummy" address of the packet we pretend to respond to.

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

Referenced by run(), and tcp_address_to_sockaddr().

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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
bindtobind specification to convert
[out]sock_lenset to the length of the address
Returns
converted bindto specification

Definition at line 2269 of file gnunet-communicator-tcp.c.

2270 {
2271  struct sockaddr *in;
2272  unsigned int port;
2273  struct sockaddr_in v4;
2274  struct sockaddr_in6 v6;
2275  char *start;
2276 
2277  start = extract_address (bindto);
2278  // FIXME: check NULL == start
2280  "start %s\n",
2281  start);
2282 
2284  "!bindto %s\n",
2285  bindto);
2286 
2287 
2288  if (1 == inet_pton (AF_INET, start, &v4.sin_addr))
2289  {
2290  // colon = strrchr (cp, ':');
2291  port = extract_port (bindto);
2292 
2294  "port %u\n",
2295  port);
2296 
2297  in = tcp_address_to_sockaddr_numeric_v4 (sock_len, v4, port);
2298  }
2299  else if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
2300  {
2301  // colon = strrchr (cp, ':');
2302  port = extract_port (bindto);
2303  in = tcp_address_to_sockaddr_numeric_v6 (sock_len, v6, port);
2304  }
2305  else
2306  {
2307  GNUNET_assert (0);
2308  }
2309 
2310  GNUNET_free (start);
2311  return in;
2312 }
static char * extract_address(const char *bindto)
This Method extracts the address part of the BINDTO string.
static unsigned int extract_port(const char *addr_and_port)
This Method extracts the port part of the BINDTO string.

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

Referenced by mq_init().

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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
mqthe message queue
msgthe message to send
impl_stateour struct Queue

Definition at line 2324 of file gnunet-communicator-tcp.c.

2327 {
2328  struct Queue *queue = impl_state;
2329  uint16_t msize = ntohs (msg->size);
2330  struct TCPBox box;
2332  "In MQ send. Queue finishing: %s; write task running: %s\n",
2333  (GNUNET_YES == queue->finishing) ? "yes" : "no",
2334  (NULL == queue->write_task) ? "yes" : "no");
2335  GNUNET_assert (mq == queue->mq);
2336  queue->mq_awaits_continue = GNUNET_YES;
2337  if (GNUNET_YES == queue->finishing)
2338  return; /* this queue is dying, drop msg */
2339  GNUNET_assert (0 == queue->pwrite_off);
2340  box.header.type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX);
2341  box.header.size = htons (msize);
2342  calculate_hmac (&queue->out_hmac, msg, msize, &box.hmac);
2343  memcpy (&queue->pwrite_buf[queue->pwrite_off], &box, sizeof(box));
2344  queue->pwrite_off += sizeof(box);
2345  memcpy (&queue->pwrite_buf[queue->pwrite_off], msg, msize);
2346  queue->pwrite_off += msize;
2348  "%lu bytes of plaintext to send\n", queue->pwrite_off);
2349  GNUNET_assert (NULL != queue->sock);
2350  if (NULL == queue->write_task)
2351  queue->write_task =
2353  queue->sock,
2354  &queue_write,
2355  queue);
2356 }
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
struct GNUNET_MessageHeader * msg
Definition: 005.c:2

References calculate_hmac(), 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, mq, msg, queue(), queue_write(), GNUNET_MessageHeader::size, and GNUNET_MessageHeader::type.

Referenced by boot_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
mqthe message queue to destroy
impl_stateour struct Queue

Definition at line 2368 of file gnunet-communicator-tcp.c.

2369 {
2370  struct Queue *queue = impl_state;
2371 
2372  if (mq == queue->mq)
2373  {
2374  queue->mq = NULL;
2375  queue_finish (queue);
2376  }
2377 }

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

Referenced by boot_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
mqmessage queue
impl_stateour struct Queue

Definition at line 2387 of file gnunet-communicator-tcp.c.

2388 {
2389  struct Queue *queue = impl_state;
2390 
2391  GNUNET_assert (0 != queue->pwrite_off);
2392  queue->pwrite_off = 0;
2393 }

References GNUNET_assert, and queue().

Referenced by boot_queue().

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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
clsour struct Queue
errorerror code

Definition at line 2406 of file gnunet-communicator-tcp.c.

2407 {
2408  struct Queue *queue = cls;
2409 
2411  "MQ error in queue to %s: %d\n",
2412  GNUNET_i2s (&queue->target),
2413  (int) error);
2414  queue_finish (queue);
2415 }

References GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, queue(), and queue_finish().

Referenced by boot_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
queuequeue to boot

Definition at line 2426 of file gnunet-communicator-tcp.c.

2427 {
2428  queue->nt =
2429  GNUNET_NT_scanner_get_type (is, queue->address, queue->address_len);
2431  queue_map,
2432  &queue->target,
2433  queue,
2436  "# queues active",
2438  GNUNET_NO);
2439  queue->timeout =
2442  &mq_destroy,
2443  &mq_cancel,
2444  queue,
2445  NULL,
2446  &mq_error,
2447  queue);
2448 }
static void mq_destroy(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
static void mq_cancel(struct GNUNET_MQ_Handle *mq, void *impl_state)
Implementation function that cancels the currently sent message.
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 c...
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.
int GNUNET_CONTAINER_multipeermap_put(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE
Allow multiple values with the same key.
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:467
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314

References 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(), is, mq_cancel(), mq_destroy(), mq_error(), mq_send(), queue(), queue_map, and stats.

Referenced by mq_init(), and proto_read_kx().

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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
queuequeue to do KX for
epubour public key for the KX

Definition at line 2462 of file gnunet-communicator-tcp.c.

2464 {
2465  struct TcpHandshakeSignature ths;
2466  struct TCPConfirmation tc;
2467 
2468  memcpy (queue->cwrite_buf, epub, sizeof(*epub));
2469  queue->cwrite_off = sizeof(*epub);
2470  /* compute 'tc' and append in encrypted format to cwrite_buf */
2471  tc.sender = my_identity;
2472  tc.monotonic_time =
2475  &tc.challenge,
2476  sizeof(tc.challenge));
2477  ths.purpose.purpose = htonl (
2479  ths.purpose.size = htonl (sizeof(ths));
2480  ths.sender = my_identity;
2481  ths.receiver = queue->target;
2482  ths.ephemeral = *epub;
2483  ths.monotonic_time = tc.monotonic_time;
2484  ths.challenge = tc.challenge;
2486  &ths,
2487  &tc.sender_sig);
2488  GNUNET_assert (0 ==
2489  gcry_cipher_encrypt (queue->out_cipher,
2490  &queue->cwrite_buf[queue->cwrite_off],
2491  sizeof(tc),
2492  &tc,
2493  sizeof(tc)));
2494  queue->challenge = tc.challenge;
2495  queue->cwrite_off += sizeof(tc);
2496 
2498  "transport",
2499  "handshake written\n");
2500 }
#define GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_HANDSHAKE
Signature used by TCP communicator handshake.
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
@ GNUNET_CRYPTO_QUALITY_NONCE
Randomness for IVs etc.
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:423
Signature we use to verify that the ephemeral key was really chosen by the specified sender.

References cfg, TcpHandshakeSignature::challenge, 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_PURPOSE_COMMUNICATOR_TCP_HANDSHAKE, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), TcpHandshakeSignature::monotonic_time, my_identity, my_private_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, queue(), TcpHandshakeSignature::receiver, TcpHandshakeSignature::sender, GNUNET_CRYPTO_EccSignaturePurpose::size, and tc.

Referenced by start_initial_kx_out().

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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
queuethe queue to setup

Definition at line 2511 of file gnunet-communicator-tcp.c.

2512 {
2513  struct GNUNET_CRYPTO_EcdhePublicKey epub;
2514 
2515  GNUNET_CRYPTO_ecdhe_key_create (&queue->ephemeral);
2516  GNUNET_CRYPTO_ecdhe_key_get_public (&queue->ephemeral, &epub);
2518  transmit_kx (queue, &epub);
2519 }
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.

References GNUNET_CRYPTO_ecdhe_key_create(), GNUNET_CRYPTO_ecdhe_key_get_public(), queue(), setup_out_cipher(), and transmit_kx().

Referenced by mq_init(), and proto_read_kx().

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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
clsQueue context the store operation was executed.
successStore operation was successful (GNUNET_OK) or not.

Definition at line 2528 of file gnunet-communicator-tcp.c.

2529 {
2530  struct Queue *queue = cls;
2531  if (GNUNET_OK != success)
2532  {
2534  "Failed to store handshake monotonic time in PEERSTORE!\n");
2535  }
2536  queue->handshake_monotime_sc = NULL;
2537 }

References GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_OK, and queue().

Referenced by handshake_monotime_cb().

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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
clsQueue context the store operation was executed.
recordThe record found or NULL if there is no record left.
emsgMessage from peerstore.

Definition at line 2548 of file gnunet-communicator-tcp.c.

2551 {
2552  struct Queue *queue = cls;
2553  struct GNUNET_TIME_AbsoluteNBO *mtbe;
2554  struct GNUNET_TIME_Absolute mt;
2555  const struct GNUNET_PeerIdentity *pid;
2556  struct GNUNET_TIME_AbsoluteNBO *handshake_monotonic_time;
2557 
2558  (void) emsg;
2559 
2560  handshake_monotonic_time = &queue->handshake_monotonic_time;
2561  pid = &queue->target;
2563  "tcp handshake with us %s\n",
2564  GNUNET_i2s (&my_identity));
2565  if (NULL == record)
2566  {
2567  queue->handshake_monotime_get = NULL;
2568  return;
2569  }
2571  "tcp handshake from peer %s\n",
2572  GNUNET_i2s (pid));
2573  if (sizeof(*mtbe) != record->value_size)
2574  {
2575  GNUNET_break (0);
2576  return;
2577  }
2578  mtbe = record->value;
2579  mt = GNUNET_TIME_absolute_ntoh (*mtbe);
2580  if (mt.abs_value_us > GNUNET_TIME_absolute_ntoh (
2581  queue->handshake_monotonic_time).abs_value_us)
2582  {
2584  "Queue from %s dropped, handshake monotime in the past\n",
2585  GNUNET_i2s (&queue->target));
2586  GNUNET_break (0);
2587  queue_finish (queue);
2588  return;
2589  }
2590  queue->handshake_monotime_sc = GNUNET_PEERSTORE_store (peerstore,
2591  "transport_tcp_communicator",
2592  pid,
2594  handshake_monotonic_time,
2595  sizeof(*
2596  handshake_monotonic_time),
2599  &
2601  queue);
2602 }
static void handshake_monotime_store_cb(void *cls, int success)
Callback called when peerstore store operation for handshake monotime is finished.
#define GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE
Key used to store sender's monotonic time from handshake message.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, 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, handshake_monotime_store_cb(), my_identity, peerstore, pid, queue(), queue_finish(), and record().

Referenced by decrypt_and_check_tc().

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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
queuequeue to decrypt initial bytes from other peer for
tc[out]where to store the result
ibufincoming data, of size INITIAL_KX_SIZE
Returns
GNUNET_OK if the signature was OK, GNUNET_SYSERR if not

Definition at line 2617 of file gnunet-communicator-tcp.c.

2620 {
2621  struct TcpHandshakeSignature ths;
2623 
2624  GNUNET_assert (
2625  0 ==
2626  gcry_cipher_decrypt (queue->in_cipher,
2627  tc,
2628  sizeof(*tc),
2629  &ibuf[sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)],
2630  sizeof(*tc)));
2631  ths.purpose.purpose = htonl (
2633  ths.purpose.size = htonl (sizeof(ths));
2634  ths.sender = tc->sender;
2635  ths.receiver = my_identity;
2636  memcpy (&ths.ephemeral, ibuf, sizeof(struct GNUNET_CRYPTO_EcdhePublicKey));
2637  ths.monotonic_time = tc->monotonic_time;
2638  ths.challenge = tc->challenge;
2641  &ths,
2642  &tc->sender_sig,
2643  &tc->sender.public_key);
2644  if (GNUNET_YES == ret)
2645  queue->handshake_monotime_get =
2647  "transport_tcp_communicator",
2648  &queue->target,
2651  queue);
2652  return ret;
2653 }
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 w...
GNUNET_GenericReturnValue
Named constants for return values.
Definition: gnunet_common.h:96

References TcpHandshakeSignature::challenge, TcpHandshakeSignature::ephemeral, GNUNET_assert, GNUNET_CRYPTO_eddsa_verify, GNUNET_PEERSTORE_iterate(), GNUNET_PEERSTORE_TRANSPORT_TCP_COMMUNICATOR_HANDSHAKE, GNUNET_SIGNATURE_PURPOSE_COMMUNICATOR_TCP_HANDSHAKE, GNUNET_YES, handshake_monotime_cb(), TcpHandshakeSignature::monotonic_time, my_identity, peerstore, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, queue(), TcpHandshakeSignature::receiver, ret, TcpHandshakeSignature::sender, GNUNET_CRYPTO_EccSignaturePurpose::size, and tc.

Referenced by proto_read_kx(), and queue_read_kx().

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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
pqproto queue to free

Definition at line 2662 of file gnunet-communicator-tcp.c.

2663 {
2664  if (NULL != pq->listen_sock)
2665  {
2667  pq->listen_sock = NULL;
2668  }
2670  GNUNET_free (pq->address);
2672  GNUNET_free (pq);
2673 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.

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

Referenced by do_shutdown(), and proto_read_kx().

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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
clsa struct ProtoQueue

Definition at line 2683 of file gnunet-communicator-tcp.c.

2684 {
2685  struct ProtoQueue *pq = cls;
2686  ssize_t rcvd;
2687  struct GNUNET_TIME_Relative left;
2688  struct Queue *queue;
2689  struct TCPConfirmation tc;
2690 
2691  pq->read_task = NULL;
2693  if (0 == left.rel_value_us)
2694  {
2695  free_proto_queue (pq);
2696  return;
2697  }
2698  rcvd = GNUNET_NETWORK_socket_recv (pq->sock,
2699  &pq->ibuf[pq->ibuf_off],
2700  sizeof(pq->ibuf) - pq->ibuf_off);
2702  "Received %lu bytes for KX\n", rcvd);
2704  "transport",
2705  "Received %lu bytes for KX\n", rcvd);
2706  if (-1 == rcvd)
2707  {
2708  if ((EAGAIN != errno) && (EINTR != errno))
2709  {
2711  free_proto_queue (pq);
2712  return;
2713  }
2714  /* try again */
2715  pq->read_task =
2717  return;
2718  }
2719  pq->ibuf_off += rcvd;
2720  if (pq->ibuf_off > sizeof(pq->ibuf))
2721  {
2722  /* read more */
2723  pq->read_task =
2725  return;
2726  }
2727  /* we got all the data, let's find out who we are talking to! */
2728  queue = GNUNET_new (struct Queue);
2729  setup_in_cipher ((const struct GNUNET_CRYPTO_EcdhePublicKey *) pq->ibuf,
2730  queue);
2731  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, pq->ibuf))
2732  {
2734  "Invalid TCP KX received from %s\n",
2735  GNUNET_a2s (pq->address, pq->address_len));
2736  gcry_cipher_close (queue->in_cipher);
2737  GNUNET_free (queue);
2738  free_proto_queue (pq);
2739  return;
2740  }
2741  queue->address = pq->address; /* steals reference */
2742  queue->address_len = pq->address_len;
2743  queue->target = tc.sender;
2744  queue->listen_sock = pq->listen_sock;
2745  queue->sock = pq->sock;
2746 
2748  "created queue with target %s\n",
2749  GNUNET_i2s (&queue->target));
2750 
2752  "start kx proto\n");
2753 
2756  boot_queue (queue);
2757  queue->read_task =
2759  queue->sock,
2760  &queue_read,
2761  queue);
2762  queue->write_task =
2764  queue->sock,
2765  &queue_write,
2766  queue);
2767  // TODO To early! Move it somewhere else.
2768  // send_challenge (tc.challenge, queue);
2769  queue->challenge_received = tc.challenge;
2770 
2772  GNUNET_free (pq);
2773 }
static void boot_queue(struct Queue *queue)
Add the given queue to our internal data structure.
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.
static void start_initial_kx_out(struct Queue *queue)
Initialize our key material for outgoing transmissions and inform the other peer about it.
static void free_proto_queue(struct ProtoQueue *pq)
Closes socket and frees memory associated with pq.
@ GNUNET_ERROR_TYPE_INFO
size_t ibuf_off
Current offset for reading into ibuf.
char ibuf[(sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)+sizeof(struct TCPConfirmation))]
Buffer for reading all the information we need to upgrade from protoqueue to queue.

References ProtoQueue::address, ProtoQueue::address_len, boot_queue(), 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_i2s(), GNUNET_log, GNUNET_log_from_nocheck(), 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, ProtoQueue::listen_sock, proto_head, proto_tail, queue(), queue_read(), queue_write(), ProtoQueue::read_task, GNUNET_TIME_Relative::rel_value_us, setup_in_cipher(), ProtoQueue::sock, start_initial_kx_out(), tc, and ProtoQueue::timeout.

Referenced by listen_cb().

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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
clsa struct Queue

Definition at line 2838 of file gnunet-communicator-tcp.c.

2839 {
2840  struct Queue *queue = cls;
2841  ssize_t rcvd;
2842  struct GNUNET_TIME_Relative left;
2843  struct TCPConfirmation tc;
2844 
2845  queue->read_task = NULL;
2846  left = GNUNET_TIME_absolute_get_remaining (queue->timeout);
2847  if (0 == left.rel_value_us)
2848  {
2849  queue_destroy (queue);
2850  return;
2851  }
2852  rcvd = GNUNET_NETWORK_socket_recv (queue->sock,
2853  &queue->cread_buf[queue->cread_off],
2854  BUF_SIZE - queue->cread_off);
2856  "Received %lu bytes for KX\n",
2857  rcvd);
2859  "transport",
2860  "Received %lu bytes for KX\n",
2861  rcvd);
2862  if (-1 == rcvd)
2863  {
2864  if ((EAGAIN != errno) && (EINTR != errno))
2865  {
2867  queue_destroy (queue);
2868  return;
2869  }
2870  queue->read_task =
2872  return;
2873  }
2874  queue->cread_off += rcvd;
2875  if (queue->cread_off < INITIAL_KX_SIZE)
2876  {
2877  /* read more */
2878  queue->read_task =
2880  return;
2881  }
2882  /* we got all the data, let's find out who we are talking to! */
2884  queue->cread_buf,
2885  queue);
2886  if (GNUNET_OK != decrypt_and_check_tc (queue, &tc, queue->cread_buf))
2887  {
2889  "Invalid TCP KX received from %s\n",
2890  GNUNET_a2s (queue->address, queue->address_len));
2891  queue_destroy (queue);
2892  return;
2893  }
2894  if (0 !=
2895  memcmp (&tc.sender, &queue->target, sizeof(struct GNUNET_PeerIdentity)))
2896  {
2898  "Invalid sender in TCP KX received from %s\n",
2899  GNUNET_a2s (queue->address, queue->address_len));
2900  queue_destroy (queue);
2901  return;
2902  }
2903  send_challenge (tc.challenge, queue);
2904  queue->write_task =
2906  queue->sock,
2907  &queue_write,
2908  queue);
2909 
2910  /* update queue timeout */
2912  /* prepare to continue with regular read task immediately */
2913  memmove (queue->cread_buf,
2914  &queue->cread_buf[INITIAL_KX_SIZE],
2915  queue->cread_off - (INITIAL_KX_SIZE));
2917  "cread_off is %lu bytes before adjusting\n",
2918  queue->cread_off);
2919  queue->cread_off -= INITIAL_KX_SIZE;
2921  "cread_off set to %lu bytes\n",
2922  queue->cread_off);
2924 }
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 ca...
#define INITIAL_KX_SIZE
Size of the initial key exchange message sent first in both directions.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1281

References BUF_SIZE, decrypt_and_check_tc(), GNUNET_a2s(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_from_nocheck(), 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(), GNUNET_TIME_Relative::rel_value_us, reschedule_queue_timeout(), send_challenge(), setup_in_cipher(), and tc.

Referenced by mq_init().

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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
clsclosure
peeridentity of the other peer
addresswhere 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 2946 of file gnunet-communicator-tcp.c.

2947 {
2948  struct Queue *queue;
2949  const char *path;
2950  struct sockaddr *in;
2951  socklen_t in_len = 0;
2952  struct GNUNET_NETWORK_Handle *sock;
2953 
2955  "Connecting to %s\n", address);
2957  "transport",
2958  "Connecting to %s\n", address);
2959  if (0 != strncmp (address,
2961  strlen (COMMUNICATOR_ADDRESS_PREFIX "-")))
2962  {
2963  GNUNET_break_op (0);
2964  return GNUNET_SYSERR;
2965  }
2966  path = &address[strlen (COMMUNICATOR_ADDRESS_PREFIX "-")];
2967  in = tcp_address_to_sockaddr (path, &in_len);
2968 
2969  if (NULL == in)
2970  {
2972  "Failed to setup TCP socket address\n");
2973  return GNUNET_SYSERR;
2974  }
2975 
2977  "in %s\n",
2978  GNUNET_a2s (in, in_len));
2979 
2980  sock = GNUNET_NETWORK_socket_create (in->sa_family, SOCK_STREAM, IPPROTO_TCP);
2981  if (NULL == sock)
2982  {
2984  "socket(%d) failed: %s",
2985  in->sa_family,
2986  strerror (errno));
2987  GNUNET_free (in);
2988  return GNUNET_SYSERR;
2989  }
2990  if ((GNUNET_OK != GNUNET_NETWORK_socket_connect (sock, in, in_len)) &&
2991  (errno != EINPROGRESS))
2992  {
2994  "connect to `%s' failed: %s",
2995  address,
2996  strerror (errno));
2998  GNUNET_free (in);
2999  return GNUNET_SYSERR;
3000  }
3001 
3002  queue = GNUNET_new (struct Queue);
3003  queue->target = *peer;
3004  queue->address = in;
3005  queue->address_len = in_len;
3006  queue->sock = sock;
3008  boot_queue (queue);
3010  "booted queue with target %s\n",
3011  GNUNET_i2s (&queue->target));
3012  // queue->mq_awaits_continue = GNUNET_YES;
3013  queue->read_task =
3015  queue->sock,
3016  &queue_read_kx,
3017  queue);
3018 
3019 
3021  "start kx mq_init\n");
3022 
3024  queue->write_task =
3026  queue->sock,
3027  &queue_write,
3028  queue);
3029  return GNUNET_OK;
3030 }
static struct sockaddr * tcp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert TCP bind specification to a struct sockaddr *
static char * address
GNS address for this phone.
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_connect(const struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Connect a socket to some remote address.
Definition: network.c:606
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:855
@ GNUNET_TRANSPORT_CS_OUTBOUND
this is an outbound connection (transport initiated)
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.

References address, boot_queue(), COMMUNICATOR_ADDRESS_PREFIX, 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_i2s(), GNUNET_log, GNUNET_log_from_nocheck(), 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(), start_initial_kx_out(), and tcp_address_to_sockaddr().

Referenced by GNUNET_TRANSPORT_communicator_connect(), and init_socket().

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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
clsNULL
keyunused
valuethe ListenTask to cancel.
Returns
GNUNET_OK to continue to iterate

Definition at line 3042 of file gnunet-communicator-tcp.c.

3045 {
3046  struct ListenTask *lt = value;
3047 
3048  (void) cls;
3049  (void) key;
3050  if (NULL != lt->listen_task)
3051  {
3053  lt->listen_task = NULL;
3054  }
3055  if (NULL != lt->listen_sock)
3056  {
3058  lt->listen_sock = NULL;
3059  }
3060  return GNUNET_OK;
3061 }
static char * value
Value of the record to add/remove.

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

Referenced by do_shutdown().

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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
clsNULL
targetunused
valuethe queue to destroy
Returns
GNUNET_OK to continue to iterate

Definition at line 3073 of file gnunet-communicator-tcp.c.

3076 {
3077  struct Queue *queue = value;
3078 
3079  (void) cls;
3080  (void) target;
3081  queue_destroy (queue);
3082  return GNUNET_OK;
3083 }
struct GNUNET_PeerIdentity target
To whom are we talking to.

References GNUNET_OK, queue(), queue_destroy(), Queue::target, and value.

Referenced by do_shutdown().

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◆ do_shutdown()

static void do_shutdown ( void *  cls)
static

Shutdown the UNIX communicator.

Parameters
clsNULL (always)

Definition at line 3092 of file gnunet-communicator-tcp.c.

3093 {
3095  "Shutdown %s!\n",
3096  shutdown_running ? "running" : "not running");
3097 
3099  return;
3100  else
3102 
3103  while (NULL != proto_head)
3105  if (NULL != nat)
3106  {
3108  nat = NULL;
3109  }
3113  if (NULL != ch)
3114  {
3117  ch = NULL;
3118  }
3119  if (NULL != stats)
3120  {
3122  stats = NULL;
3123  }
3124  if (NULL != my_private_key)
3125  {
3127  my_private_key = NULL;
3128  }
3129  if (NULL != is)
3130  {
3132  is = NULL;
3133  }
3134  if (NULL != peerstore)
3135  {
3137  peerstore = NULL;
3138  }
3139  if (NULL != resolve_request_handle)
3140  {
3142  resolve_request_handle = NULL;
3143  }
3145  "Shutdown done!\n");
3146 }
static int get_queue_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all message queues to clean up.
static int get_lt_delete_it(void *cls, const struct GNUNET_HashCode *key, void *value)
Iterator over all ListenTasks to clean up.
struct GNUNET_RESOLVER_RequestHandle * resolve_request_handle
Handle for DNS lookup of bindto address.
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
int GNUNET_CONTAINER_multipeermap_iterate(struct GNUNET_CONTAINER_MultiPeerMap *map, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map.
int GNUNET_CONTAINER_multihashmap_iterate(struct GNUNET_CONTAINER_MultiHashMap *map, GNUNET_CONTAINER_MulitHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map.
void GNUNET_NAT_unregister(struct GNUNET_NAT_Handle *nh)
Stop port redirection and public IP address detection for the given handle.
Definition: nat_api.c:701
void GNUNET_NT_scanner_done(struct GNUNET_NT_InterfaceScanner *is)
Terminate interface scanner.
Definition: nt.c:433
void GNUNET_PEERSTORE_disconnect(struct GNUNET_PEERSTORE_Handle *h, int sync_first)
Disconnect from the PEERSTORE service.
void GNUNET_RESOLVER_request_cancel(struct GNUNET_RESOLVER_RequestHandle *rh)
Cancel a request that is still pending with the resolver.
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
void GNUNET_TRANSPORT_communicator_disconnect(struct GNUNET_TRANSPORT_CommunicatorHandle *ch)
Disconnect from the transport service.
void GNUNET_TRANSPORT_communicator_address_remove_all(struct GNUNET_TRANSPORT_CommunicatorHandle *ch)
Notify transport service that this communicator no longer provides all its addresses for this peer.

References ch, 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, is, lt_map, my_private_key, nat, peerstore, proto_head, queue_map, resolve_request_handle, shutdown_running, and stats.

Referenced by run().

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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
clsclosure
senderwhich peer sent the notification
msgpayload

Definition at line 3161 of file gnunet-communicator-tcp.c.

3164 {
3165  (void) cls;
3166  (void) sender;
3167  (void) msg;
3168  GNUNET_break_op (0);
3169 }

References GNUNET_break_op, and msg.

Referenced by init_socket().

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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
clsclosure
app_ctx[in,out]location where the app can store stuff on add and retrieve it on remove
add_removeGNUNET_YES to add a new public IP address, GNUNET_NO to remove a previous (now invalid) one
acaddress class the address belongs to
addreither the previous or the new public IP address
addrlenactual length of the addr

Definition at line 3186 of file gnunet-communicator-tcp.c.

3192 {
3193  char *my_addr;
3195 
3197  "nat address cb %s %s\n",
3198  add_remove ? "add" : "remove",
3199  GNUNET_a2s (addr, addrlen));
3200 
3201  if (GNUNET_YES == add_remove)
3202  {
3203  enum GNUNET_NetworkType nt;
3204 
3205  GNUNET_asprintf (&my_addr,
3206  "%s-%s",
3208  GNUNET_a2s (addr, addrlen));
3209  nt = GNUNET_NT_scanner_get_type (is, addr, addrlen);
3210  ai =
3212  my_addr,
3213  nt,
3215  GNUNET_free (my_addr);
3216  *app_ctx = ai;
3217  }
3218  else
3219  {
3220  ai = *app_ctx;
3222  *app_ctx = NULL;
3223  }
3224 }
static struct GNUNET_TRANSPORT_AddressIdentifier * ai
Handle to the operation that publishes our address.
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:36
void GNUNET_TRANSPORT_communicator_address_remove(struct GNUNET_TRANSPORT_AddressIdentifier *ai)
Notify transport service about an address that this communicator no longer provides for this peer.
struct GNUNET_TRANSPORT_AddressIdentifier * GNUNET_TRANSPORT_communicator_address_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const char *address, enum GNUNET_NetworkType nt, struct GNUNET_TIME_Relative expiration)
Notify transport service about an address that this communicator provides for this peer.
Internal representation of an address a communicator is currently providing for the transport service...

References ai, ch, 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, is, and nt.

Referenced by nat_register().

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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 3231 of file gnunet-communicator-tcp.c.

3232 {
3233 
3234  struct Addresses *saddrs;
3235 
3237  "add address %s\n",
3238  GNUNET_a2s (in, in_len));
3239 
3240  saddrs = GNUNET_new (struct Addresses);
3241  saddrs->addr = in;
3242  saddrs->addr_len = in_len;
3244 
3246  "after add address %s\n",
3247  GNUNET_a2s (in, in_len));
3248 
3250  "add address %s\n",
3251  GNUNET_a2s (saddrs->addr, saddrs->addr_len));
3252 
3253  addrs_lens++;
3254 }
int addrs_lens
Number of addresses in the DLL for register at NAT service.
struct Addresses * addrs_head
Head of DLL with addresses we like to register at NAT servcie.
struct Addresses * addrs_tail
Head of DLL with addresses we like to register at NAT servcie.
DLL to store the addresses we like to register at NAT service.
struct sockaddr * addr
Address we like to register at NAT service.
socklen_t addr_len
Length of address we like to register at NAT service.

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

Referenced by init_socket().

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◆ init_socket()

static int init_socket ( struct sockaddr *  addr,
socklen_t  in_len 
)
static

This method launch network interactions for each address we like to bind to.

Parameters
addrThe address we will listen to.
in_lenThe length of the address we will listen to.
Returns
GNUNET_SYSERR in case of error. GNUNET_OK in case we are successfully listen to the address.

Definition at line 3265 of file gnunet-communicator-tcp.c.

3267 {
3268  struct sockaddr_storage in_sto;
3269  socklen_t sto_len;
3270  struct GNUNET_NETWORK_Handle *listen_sock;
3271  struct ListenTask *lt;
3272  int sockfd;
3273  struct GNUNET_HashCode h_sock;
3274 
3275  if (NULL == addr)
3276  {
3278  "Address is NULL.\n");
3279  return GNUNET_SYSERR;
3280  }
3281 
3283  "address %s\n",
3284  GNUNET_a2s (addr, in_len));
3285 
3286  listen_sock =
3287  GNUNET_NETWORK_socket_create (addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
3288  if (NULL == listen_sock)
3289  {
3291  return GNUNET_SYSERR;
3292  }
3293 
3294  if (GNUNET_OK != GNUNET_NETWORK_socket_bind (listen_sock, addr, in_len))
3295  {
3297  GNUNET_NETWORK_socket_close (listen_sock);
3298  listen_sock = NULL;
3299  return GNUNET_SYSERR;
3300  }
3301 
3302  if (GNUNET_OK !=
3303  GNUNET_NETWORK_socket_listen (listen_sock,
3304  5))
3305  {
3307  "listen");
3308  GNUNET_NETWORK_socket_close (listen_sock);
3309  listen_sock = NULL;
3310  return GNUNET_SYSERR;
3311  }
3312 
3313  /* We might have bound to port 0, allowing the OS to figure it out;
3314  thus, get the real IN-address from the socket */
3315  sto_len = sizeof(in_sto);
3316 
3317  if (0 != getsockname (GNUNET_NETWORK_get_fd (listen_sock),
3318  (struct sockaddr *) &in_sto,
3319  &sto_len))
3320  {
3321  memcpy (&in_sto, addr, in_len);
3322  sto_len = in_len;
3323  }
3324 
3325  // addr = (struct sockaddr *) &in_sto;
3326  in_len = sto_len;
3328  "Bound to `%s'\n",
3329  GNUNET_a2s ((const struct sockaddr *) &in_sto, sto_len));
3330  stats = GNUNET_STATISTICS_create ("C-TCP", cfg);
3331 
3332  if (NULL == is)
3334 
3335  if (NULL == my_private_key)
3337  if (NULL == my_private_key)
3338  {
3339  GNUNET_log (
3341  _ (
3342  "Transport service is lacking key configuration settings. Exiting.\n"));
3343  if (NULL != resolve_request_handle)
3346  return GNUNET_SYSERR;
3347  }
3349  /* start listening */
3350 
3351  lt = GNUNET_new (struct ListenTask);
3352  lt->listen_sock = listen_sock;
3353 
3355  listen_sock,
3356  &listen_cb,
3357  lt);
3358 
3360  "creating hash\n");
3361  sockfd = GNUNET_NETWORK_get_fd (lt->listen_sock);
3362  GNUNET_CRYPTO_hash (&sockfd,
3363  sizeof(int),
3364  &h_sock);
3365 
3367  "creating map\n");
3368  if (NULL == lt_map)
3370 
3372  "creating map entry\n");
3375  &h_sock,
3376  lt,
3378 
3380  "map entry created\n");
3381 
3382  if (NULL == queue_map)
3384 
3385  if (NULL == ch)
3390  &mq_init,
3391  NULL,
3392  &enc_notify_cb,
3393  NULL);
3394 
3395  if (NULL == ch)
3396  {
3397  GNUNET_break (0);
3398  if (NULL != resolve_request_handle)
3401  return GNUNET_SYSERR;
3402  }
3403 
3404  add_addr (addr, in_len);
3405  return GNUNET_OK;
3406 
3407 }
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 (!...
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 abou...
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.
struct GNUNET_CRYPTO_EddsaPrivateKey * GNUNET_CRYPTO_eddsa_key_create_from_configuration(const struct GNUNET_CONFIGURATION_Handle *cfg)
Create a new private key by reading our peer's key from the file specified in the configuration.
void GNUNET_CRYPTO_eddsa_key_get_public(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:197
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
struct GNUNET_CONTAINER_MultiPeerMap * GNUNET_CONTAINER_multipeermap_create(unsigned int len, int do_not_copy_keys)
Create a multi peer map (hash map for public keys of peers).
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY
There must only be one value per key; storing a value should fail if a value under the same key alrea...
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_bind(struct GNUNET_NETWORK_Handle *desc, const struct sockaddr *address, socklen_t address_len)
Bind a socket to a particular address.
Definition: network.c:439
enum GNUNET_GenericReturnValue GNUNET_NETWORK_socket_listen(const struct GNUNET_NETWORK_Handle *desc, int backlog)
Listen on a socket.
Definition: network.c:656
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:412
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:533
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
struct GNUNET_TRANSPORT_CommunicatorHandle * GNUNET_TRANSPORT_communicator_connect(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section_name, const char *addr_prefix, enum GNUNET_TRANSPORT_CommunicatorCharacteristics cc, GNUNET_TRANSPORT_CommunicatorMqInit mq_init, void *mq_init_cls, GNUNET_TRANSPORT_CommunicatorNotify notify_cb, void *notify_cb_cls)
Connect to the transport service.
@ GNUNET_TRANSPORT_CC_RELIABLE
Transmission is reliabile (with ACKs), e.g.
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
struct GNUNET_CRYPTO_EddsaPublicKey public_key

References _, add_addr(), cfg, ch, COMMUNICATOR_ADDRESS_PREFIX, COMMUNICATOR_CONFIG_SECTION, enc_notify_cb(), GNUNET_a2s(), GNUNET_assert, GNUNET_break, GNUNET_CONTAINER_multihashmap_create(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY, GNUNET_CONTAINER_multipeermap_create(), GNUNET_CRYPTO_eddsa_key_create_from_configuration(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_get_fd(), GNUNET_NETWORK_socket_bind(), GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_create(), GNUNET_NETWORK_socket_listen(), GNUNET_new, GNUNET_NO, GNUNET_NT_scanner_init(), GNUNET_OK, GNUNET_RESOLVER_request_cancel(), GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), GNUNET_SYSERR, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_CC_RELIABLE, GNUNET_TRANSPORT_communicator_connect(), is, listen_cb(), ListenTask::listen_sock, ListenTask::listen_task, lt_map, mq_init(), my_identity, my_private_key, GNUNET_PeerIdentity::public_key, queue_map, resolve_request_handle, and stats.

Referenced by init_socket_resolv(), and run().

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◆ nat_register()

static void nat_register ( )
static

This method reads from the DLL addrs_head to register them at the NAT service.

Definition at line 3414 of file gnunet-communicator-tcp.c.

3415 {
3416  struct sockaddr **saddrs;
3417  socklen_t *saddr_lens;
3418  int i;
3419  size_t len;
3420 
3422  "starting nat register!\n");
3423  len = 0;
3424  i = 0;
3425  saddrs = GNUNET_malloc ((addrs_lens) * sizeof(struct sockaddr *));
3426  saddr_lens = GNUNET_malloc ((addrs_lens) * sizeof(socklen_t));
3427  for (struct Addresses *pos = addrs_head; NULL != pos; pos = pos->next)
3428  {
3430  "registering address %s\n",
3432 
3433  saddr_lens[i] = addrs_head->addr_len;
3434  len += saddr_lens[i];
3435  saddrs[i] = GNUNET_memdup (addrs_head->addr, saddr_lens[i]);
3436  i++;
3437  }
3438 
3440  "registering addresses %lu %lu %lu %lu\n",
3441  (addrs_lens) * sizeof(struct sockaddr *),
3442  (addrs_lens) * sizeof(socklen_t),
3443  len,
3444  sizeof(COMMUNICATOR_CONFIG_SECTION));
3447  IPPROTO_TCP,
3448  addrs_lens,
3449  (const struct sockaddr **) saddrs,
3450  saddr_lens,
3451  &nat_address_cb,
3452  NULL /* FIXME: support reversal: #5529 */,
3453  NULL /* closure */);
3454  for (i = addrs_lens - 1; i >= 0; i--)
3455  GNUNET_free (saddrs[i]);
3456  GNUNET_free (saddrs);
3457  GNUNET_free (saddr_lens);
3458 
3459  if (NULL == nat)
3460  {
3461  GNUNET_break (0);
3462  if (NULL != resolve_request_handle)
3465  }
3466 }
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 ...
uint16_t len
length of data (which is always a uint32_t, but presumably this can be used to specify that fewer byt...
struct GNUNET_NAT_Handle * GNUNET_NAT_register(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *config_section, uint8_t proto, unsigned int num_addrs, const struct sockaddr **addrs, const socklen_t *addrlens, GNUNET_NAT_AddressCallback address_callback, GNUNET_NAT_ReversalCallback reversal_callback, void *callback_cls)
Attempt to enable port redirection and detect public IP address contacting UPnP or NAT-PMP routers on...
Definition: nat_api.c:386
struct Addresses * next
Kept in a DLL.

References Addresses::addr, Addresses::addr_len, addrs_head, addrs_lens, cfg, COMMUNICATOR_CONFIG_SECTION, GNUNET_a2s(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memdup, GNUNET_NAT_register(), GNUNET_RESOLVER_request_cancel(), GNUNET_SCHEDULER_shutdown(), len, nat, nat_address_cb(), Addresses::next, and resolve_request_handle.

Referenced by init_socket_resolv(), and run().

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◆ init_socket_resolv()

static void init_socket_resolv ( void *  cls,
const struct sockaddr *  addr,
socklen_t  in_len 
)
static

This method is the callback called by the resolver API, and wraps method init_socket.

Parameters
clsThe port we will bind to.
addrThe address we will bind to.
in_lenThe length of the address we will bind to.

Definition at line 3477 of file gnunet-communicator-tcp.c.

3480 {
3481  struct sockaddr_in *v4;
3482  struct sockaddr_in6 *v6;
3483  struct sockaddr *in;
3484 
3485  (void) cls;
3486  if (NULL != addr)
3487  {
3488  if (AF_INET == addr->sa_family)
3489  {
3490  v4 = (struct sockaddr_in *) addr;
3491  in = tcp_address_to_sockaddr_numeric_v4 (&in_len, *v4, bind_port);// _global);
3492  }
3493  else if (AF_INET6 == addr->sa_family)
3494  {
3495  v6 = (struct sockaddr_in6 *) addr;
3496  in = tcp_address_to_sockaddr_numeric_v6 (&in_len, *v6, bind_port);// _global);
3497  }
3498  else
3499  {
3501  "Address family %u not suitable (not AF_INET %u nor AF_INET6 %u \n",
3502  addr->sa_family,
3503  AF_INET,
3504  AF_INET6);
3505  return;
3506  }
3507  init_socket (in, in_len);
3508  }
3509  else
3510  {
3512  "Address is NULL. This might be an error or the resolver finished resolving.\n");
3513  if (NULL == addrs_head)
3514  {
3516  "Resolver finished resolving, but we do not listen to an address!.\n");
3517  return;
3518  }
3519  nat_register ();
3520  }
3521 }
unsigned int bind_port
The port the communicator should be assigned to.
static int init_socket(struct sockaddr *addr, socklen_t in_len)
This method launch network interactions for each address we like to bind to.
static void nat_register()
This method reads from the DLL addrs_head to register them at the NAT service.

References addrs_head, bind_port, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_INFO, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, init_socket(), nat_register(), tcp_address_to_sockaddr_numeric_v4(), and tcp_address_to_sockaddr_numeric_v6().

Referenced by run().

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◆ run()

static void run ( void *  cls,
char *const *  args,
const char *  cfgfile,
const struct GNUNET_CONFIGURATION_Handle c 
)
static

Setup communicator and launch network interactions.

Parameters
clsNULL (always)
argsremaining command-line arguments
cfgfilename of the configuration file used (for saving, can be NULL!)
cconfiguration

Definition at line 3533 of file gnunet-communicator-tcp.c.

3537 {
3538  char *bindto;
3539  struct sockaddr *in;
3540  socklen_t in_len;
3541  struct sockaddr_in v4;
3542  struct sockaddr_in6 v6;
3543  char *start;
3544  unsigned int port;
3545  char dummy[2];
3546  char *rest = NULL;
3547  struct PortOnlyIpv4Ipv6 *po;
3548  socklen_t addr_len_ipv4;
3549  socklen_t addr_len_ipv6;
3550 
3551  (void) cls;
3552  cfg = c;
3553  if (GNUNET_OK !=
3556  "BINDTO",
3557  &bindto))
3558  {
3561  "BINDTO");
3562  return;
3563  }
3564  if (GNUNET_OK !=
3567  "MAX_QUEUE_LENGTH",
3568  &max_queue_length))
3570  if (GNUNET_OK !=
3573  "REKEY_INTERVAL",
3574  &rekey_interval))
3576 
3578  if (NULL == peerstore)
3579  {
3580  GNUNET_free (bindto);
3581  GNUNET_break (0);
3583  return;
3584  }
3585 
3587 
3588  if (1 == sscanf (bindto, "%u%1s", &bind_port, dummy))
3589  {
3593  "address po %s\n",
3595  if (NULL != po->addr_ipv4)
3596  {
3598  }
3599  if (NULL != po->addr_ipv6)
3600  {
3603  }
3604  GNUNET_free (po);
3605  nat_register ();
3606  GNUNET_free (bindto);
3607  return;
3608  }
3609 
3610  start = extract_address (bindto);
3611  // FIXME: check for NULL == start...
3612  if (1 == inet_pton (AF_INET, start, &v4.sin_addr))
3613  {
3614  bind_port = extract_port (bindto);
3615 
3616  in = tcp_address_to_sockaddr_numeric_v4 (&in_len, v4, bind_port);
3617  init_socket (in, in_len);
3618  nat_register ();
3619  GNUNET_free (start);
3620  GNUNET_free (bindto);
3621  return;
3622  }
3623 
3624  if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
3625  {
3626  bind_port = extract_port (bindto);
3627  in = tcp_address_to_sockaddr_numeric_v6 (&in_len, v6, bind_port);
3628  init_socket (in, in_len);
3629  nat_register ();
3630  GNUNET_free (start);
3631  GNUNET_free (bindto);
3632  return;
3633  }
3634 
3635  bind_port = extract_port (bindto);
3636  resolve_request_handle = GNUNET_RESOLVER_ip_get (strtok_r (bindto,
3637  ":",
3638  &rest),
3639  AF_UNSPEC,
3642  &port);
3643  GNUNET_free (bindto);
3644  GNUNET_free (start);
3645 }
static struct PortOnlyIpv4Ipv6 * tcp_address_to_sockaddr_port_only(const char *bindto, unsigned int *port)
Convert TCP bind specification to a struct PortOnlyIpv4Ipv6 *
static void do_shutdown(void *cls)
Shutdown the UNIX communicator.
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.
#define DEFAULT_REKEY_INTERVAL
How often do we rekey based on time (at least)
#define DEFAULT_MAX_QUEUE_LENGTH
How many messages do we keep at most in the queue to the transport service before we start to drop (d...
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_number(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, unsigned long long *number)
Get a configuration value that should be a number.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_time(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, struct GNUNET_TIME_Relative *time)
Get a configuration value that should be a relative time.
enum GNUNET_GenericReturnValue GNUNET_CONFIGURATION_get_value_string(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be a string.
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
struct GNUNET_PEERSTORE_Handle * GNUNET_PEERSTORE_connect(const struct GNUNET_CONFIGURATION_Handle *cfg)
Connect to the PEERSTORE service.
struct GNUNET_RESOLVER_RequestHandle * GNUNET_RESOLVER_ip_get(const char *hostname, int af, struct GNUNET_TIME_Relative timeout, GNUNET_RESOLVER_AddressCallback callback, void *callback_cls)
Convert a string to one or more IP addresses.
Definition: resolver_api.c:939
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_shutdown(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received,...
Definition: scheduler.c:1316
#define GNUNET_TIME_UNIT_MINUTES
One minute.

References PortOnlyIpv4Ipv6::addr_ipv4, PortOnlyIpv4Ipv6::addr_ipv6, PortOnlyIpv4Ipv6::addr_len_ipv4, PortOnlyIpv4Ipv6::addr_len_ipv6, bind_port, cfg, COMMUNICATOR_CONFIG_SECTION, DEFAULT_MAX_QUEUE_LENGTH, DEFAULT_REKEY_INTERVAL, do_shutdown(), dummy, extract_address(), extract_port(), GNUNET_a2s(), GNUNET_break, GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONFIGURATION_get_value_string(), GNUNET_CONFIGURATION_get_value_time(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_log_config_missing(), GNUNET_OK, GNUNET_PEERSTORE_connect(), GNUNET_RESOLVER_ip_get(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_TIME_UNIT_MINUTES, init_socket(), init_socket_resolv(), max_queue_length, nat_register(), peerstore, port, rekey_interval, resolve_request_handle, start, tcp_address_to_sockaddr_numeric_v4(), tcp_address_to_sockaddr_numeric_v6(), and tcp_address_to_sockaddr_port_only().

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◆ main()

int main ( int  argc,
char *const *  argv 
)

The main function for the UNIX communicator.

Parameters
argcnumber of arguments from the command line
argvcommand line arguments
Returns
0 ok, 1 on error

Definition at line 3656 of file gnunet-communicator-tcp.c.

3657 {
3658  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
3660  };
3661  int ret;
3662 
3664  "transport",
3665  "Starting tcp communicator\n");
3666  if (GNUNET_OK !=
3667  GNUNET_STRINGS_get_utf8_args (argc, argv,
3668  &argc, &argv))
3669  return 2;
3670 
3671  ret = (GNUNET_OK ==
3672  GNUNET_PROGRAM_run (argc,
3673  argv,
3674  "gnunet-communicator-tcp",
3675  _ ("GNUnet TCP communicator"),
3676  options,
3677  &run,
3678  NULL))
3679  ? 0
3680  : 1;
3681  GNUNET_free_nz ((void *) argv);
3682  return ret;
3683 }
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Setup communicator and launch network interactions.
#define GNUNET_free_nz(ptr)
Wrapper around free.
enum GNUNET_GenericReturnValue GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration,...
Definition: program.c:399
enum GNUNET_GenericReturnValue GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1223
Definition of a command line option.

Variable Documentation

◆ max_queue_length

unsigned long long max_queue_length
static

Maximum queue length before we stop reading towards the transport service.

Definition at line 745 of file gnunet-communicator-tcp.c.

Referenced by queue_read(), and run().

◆ stats

struct GNUNET_STATISTICS_Handle* stats
static

◆ ch

◆ queue_map

struct GNUNET_CONTAINER_MultiPeerMap* queue_map
static

Queues (map from peer identity to struct Queue)

Definition at line 760 of file gnunet-communicator-tcp.c.

Referenced by boot_queue(), do_shutdown(), init_socket(), and queue_destroy().

◆ lt_map

struct GNUNET_CONTAINER_MultiHashMap* lt_map
static

ListenTasks (map from socket to struct ListenTask)

Definition at line 765 of file gnunet-communicator-tcp.c.

Referenced by do_shutdown(), init_socket(), and queue_destroy().

◆ my_identity

struct GNUNET_PeerIdentity my_identity
static

◆ rekey_interval

struct GNUNET_TIME_Relative rekey_interval
static

The rekey interval.

Definition at line 765 of file gnunet-communicator-tcp.c.

Referenced by run(), and setup_out_cipher().

◆ my_private_key

struct GNUNET_CRYPTO_EddsaPrivateKey* my_private_key
static

Our private key.

Definition at line 780 of file gnunet-communicator-tcp.c.

Referenced by do_shutdown(), init_socket(), inject_rekey(), send_challenge(), setup_in_cipher(), and transmit_kx().

◆ cfg

const struct GNUNET_CONFIGURATION_Handle* cfg
static

◆ is

struct GNUNET_NT_InterfaceScanner* is
static

◆ nat

struct GNUNET_NAT_Handle* nat
static

Connection to NAT service.

Definition at line 795 of file gnunet-communicator-tcp.c.

Referenced by do_shutdown(), and nat_register().

◆ proto_head

struct ProtoQueue* proto_head
static

Protoqueues DLL head.

Definition at line 800 of file gnunet-communicator-tcp.c.

Referenced by do_shutdown(), free_proto_queue(), listen_cb(), and proto_read_kx().

◆ proto_tail

struct ProtoQueue* proto_tail
static

Protoqueues DLL tail.

Definition at line 805 of file gnunet-communicator-tcp.c.

Referenced by free_proto_queue(), listen_cb(), and proto_read_kx().

◆ resolve_request_handle

struct GNUNET_RESOLVER_RequestHandle* resolve_request_handle

Handle for DNS lookup of bindto address.

Definition at line 810 of file gnunet-communicator-tcp.c.

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

◆ addrs_head

struct Addresses* addrs_head

Head of DLL with addresses we like to register at NAT servcie.

Definition at line 815 of file gnunet-communicator-tcp.c.

Referenced by add_addr(), init_socket_resolv(), and nat_register().

◆ addrs_tail

struct Addresses* addrs_tail

Head of DLL with addresses we like to register at NAT servcie.

Definition at line 820 of file gnunet-communicator-tcp.c.

Referenced by add_addr().

◆ lts_head

struct ListenTask* lts_head

Head of DLL with ListenTasks.

Definition at line 825 of file gnunet-communicator-tcp.c.

◆ lts_tail

struct ListenTask* lts_tail

Head of DLL with ListenTask.

Definition at line 830 of file gnunet-communicator-tcp.c.

◆ addrs_lens

int addrs_lens

Number of addresses in the DLL for register at NAT service.

Definition at line 835 of file gnunet-communicator-tcp.c.

Referenced by add_addr(), and nat_register().

◆ unverified_size

size_t unverified_size

Size of data received without KX challenge played back.

Definition at line 841 of file gnunet-communicator-tcp.c.

Referenced by try_handle_plaintext().

◆ peerstore

struct GNUNET_PEERSTORE_Handle* peerstore
static

◆ shutdown_running

int shutdown_running = GNUNET_NO

A flag indicating we are already doing a shutdown.

Definition at line 851 of file gnunet-communicator-tcp.c.

Referenced by do_shutdown(), and queue_destroy().

◆ bind_port

unsigned int bind_port

The port the communicator should be assigned to.

Definition at line 856 of file gnunet-communicator-tcp.c.

Referenced by init_socket_resolv(), and run().