GNUnet  0.10.x
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_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 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  TCPConfirmation
 Encrypted continuation of TCP initial handshake. More...
 
struct  TCPBox
 TCP message box. More...
 
struct  TCPRekey
 TCP rekey message box. More...
 
struct  TCPFinish
 TCP finish. 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...
 

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 REKEY_TIME_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 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 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 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 (const char *bindto, socklen_t *sock_len)
 Convert TCP bind specification to a struct sockaddr * 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 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, enum GNUNET_TRANSPORT_ConnectionStatus cs)
 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 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_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 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 struct GNUNET_SCHEDULER_Tasklisten_task
 ID of listen task. More...
 
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_NETWORK_Handlelisten_sock
 Listen socket. More...
 
static struct GNUNET_PeerIdentity my_identity
 Our public key. 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...
 

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 49 of file gnunet-communicator-tcp.c.

Referenced by pass_plaintext_to_core().

◆ DEFAULT_MAX_QUEUE_LENGTH

#define DEFAULT_MAX_QUEUE_LENGTH   8

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

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

Definition at line 60 of file gnunet-communicator-tcp.c.

Referenced by run().

◆ BUF_SIZE

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

Size of our IO buffers for ciphertext data.

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

Definition at line 66 of file gnunet-communicator-tcp.c.

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

◆ REKEY_TIME_INTERVAL

#define REKEY_TIME_INTERVAL   GNUNET_TIME_UNIT_DAYS

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

Definition at line 71 of file gnunet-communicator-tcp.c.

Referenced by setup_out_cipher().

◆ 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 76 of file gnunet-communicator-tcp.c.

Referenced by listen_cb().

◆ REKEY_MAX_BYTES

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

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

Definition at line 82 of file gnunet-communicator-tcp.c.

Referenced by setup_out_cipher().

◆ INITIAL_KX_SIZE

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

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

Definition at line 88 of file gnunet-communicator-tcp.c.

Referenced by queue_read_kx().

◆ COMMUNICATOR_ADDRESS_PREFIX

#define COMMUNICATOR_ADDRESS_PREFIX   "tcp"

Address prefix used by the communicator.

Definition at line 96 of file gnunet-communicator-tcp.c.

Referenced by boot_queue(), mq_init(), nat_address_cb(), and run().

◆ COMMUNICATOR_CONFIG_SECTION

#define COMMUNICATOR_CONFIG_SECTION   "communicator-tcp"

Configuration section used by the communicator.

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

Referenced by run(), and tcp_address_to_sockaddr().

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

Definition at line 1712 of file gnunet-communicator-tcp.c.

References ProtoQueue::address, ProtoQueue::address_len, GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_ERROR_TYPE_WARNING, 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, PROTO_QUEUE_TIMEOUT, proto_read_kx(), ProtoQueue::read_task, ProtoQueue::sock, and ProtoQueue::timeout.

Referenced by GNUNET_SET_listen(), queue_destroy(), and run().

1713 {
1714  struct sockaddr_storage in;
1715  socklen_t addrlen;
1716  struct GNUNET_NETWORK_Handle *sock;
1717  struct ProtoQueue *pq;
1718 
1719  listen_task = NULL;
1720  GNUNET_assert(NULL != listen_sock);
1721  addrlen = sizeof(in);
1722  memset(&in, 0, sizeof(in));
1724  (struct sockaddr *)&in,
1725  &addrlen);
1726  if ((NULL == sock) && ((EMFILE == errno) || (ENFILE == errno)))
1727  return; /* system limit reached, wait until connection goes down */
1729  listen_sock,
1730  &listen_cb,
1731  NULL);
1732  if ((NULL == sock) && ((EAGAIN == errno) || (ENOBUFS == errno)))
1733  return;
1734  if (NULL == sock)
1735  {
1737  return;
1738  }
1739  pq = GNUNET_new(struct ProtoQueue);
1740  pq->address_len = addrlen;
1741  pq->address = GNUNET_memdup(&in, addrlen);
1743  pq->sock = sock;
1745  pq->sock,
1746  &proto_read_kx,
1747  pq);
1749 }
static void listen_cb(void *cls)
We have been notified that our listen socket has something to read.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
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:246
static struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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?
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Handle for an incoming connection where we do not yet have enough information to setup a full queue...
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:420
#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...
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_TIME_Absolute timeout
Timeout for this protoqueue.
struct sockaddr * address
Address of the other peer.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
static struct ProtoQueue * proto_tail
Protoqueues DLL tail.
static struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
socklen_t address_len
Length of the address.
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
handle to a socket
Definition: network.c:46
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:1467
static struct ProtoQueue * proto_head
Protoqueues DLL head.
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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 567 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::backpressure, Queue::destroyed, GNUNET_assert, GNUNET_CONTAINER_multipeermap_remove(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_MQ_destroy(), GNUNET_NETWORK_socket_close(), GNUNET_NO, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_set(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_communicator_mq_del(), GNUNET_YES, Queue::in_cipher, listen_cb(), mq, Queue::mq, Queue::out_cipher, Queue::qh, Queue::read_task, Queue::sock, Queue::target, and Queue::write_task.

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

568 {
569  struct GNUNET_MQ_Handle *mq;
570 
572  "Disconnecting queue for peer `%s'\n",
573  GNUNET_i2s(&queue->target));
574  if (NULL != (mq = queue->mq))
575  {
576  queue->mq = NULL;
577  GNUNET_MQ_destroy(mq);
578  }
579  if (NULL != queue->qh)
580  {
582  queue->qh = NULL;
583  }
585  GNUNET_YES ==
588  "# queues active",
590  GNUNET_NO);
591  if (NULL != queue->read_task)
592  {
594  queue->read_task = NULL;
595  }
596  if (NULL != queue->write_task)
597  {
599  queue->write_task = NULL;
600  }
602  gcry_cipher_close(queue->in_cipher);
603  gcry_cipher_close(queue->out_cipher);
604  GNUNET_free(queue->address);
605  if (0 != queue->backpressure)
606  queue->destroyed = GNUNET_YES;
607  else
608  GNUNET_free(queue);
609  if (NULL == listen_task)
611  listen_sock,
612  &listen_cb,
613  NULL);
614 }
static void listen_cb(void *cls)
We have been notified that our listen socket has something to read.
struct GNUNET_PeerIdentity target
To whom are we talking to.
unsigned int backpressure
How may messages did we pass from this queue to CORE for which we have yet to receive an acknoweldgem...
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
int destroyed
Did we technically destroy this queue, but kept the allocation around because of backpressure not bei...
static struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
int 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.
#define GNUNET_NO
Definition: gnunet_common.h:78
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
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.
static struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_SCHEDULER_Task * write_task
ID of write task for this connection.
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
static struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
Handle to a message queue.
Definition: mq.c:84
struct sockaddr * address
Address of the other peer.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
#define GNUNET_log(kind,...)
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:821
#define GNUNET_YES
Definition: gnunet_common.h:77
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:1467
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
struct GNUNET_TRANSPORT_QueueHandle * qh
handle for this queue with the ch.
gcry_cipher_hd_t out_cipher
cipher for encryption of outgoing data.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:548
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ 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 626 of file gnunet-communicator-tcp.c.

References GNUNET_CRYPTO_hash(), and GNUNET_CRYPTO_hmac_raw().

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

630 {
631  struct GNUNET_HashCode mac;
632 
633  GNUNET_CRYPTO_hmac_raw(hmac_secret,
634  sizeof(struct GNUNET_HashCode),
635  buf,
636  buf_size,
637  &mac);
638  /* truncate to `struct GNUNET_ShortHashCode` */
639  memcpy(smac, &mac, sizeof(struct GNUNET_ShortHashCode));
640  /* ratchet hmac key */
641  GNUNET_CRYPTO_hash(hmac_secret,
642  sizeof(struct GNUNET_HashCode),
643  hmac_secret);
644 }
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' this be the standard hmac function and the abov...
Definition: crypto_hash.c:383
A 256-bit hashcode.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:44
static char buf[2048]
A 512-bit hashcode.
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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 654 of file gnunet-communicator-tcp.c.

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

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

655 {
656  struct TCPFinish fin;
657 
658  memset(&fin, 0, sizeof(fin));
659  fin.header.size = htons(sizeof(fin));
660  fin.header.type = htons(GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH);
661  calculate_hmac(&queue->out_hmac, &fin, sizeof(fin), &fin.hmac);
662  /* if there is any message left in pwrite_buf, we
663  overwrite it (possibly dropping the last message
664  from CORE hard here) */
665  memcpy(queue->pwrite_buf, &fin, sizeof(fin));
666  queue->pwrite_off = sizeof(fin);
667  /* This flag will ensure that #queue_write() no longer
668  notifies CORE about the possibility of sending
669  more data, and that #queue_write() will call
670  #queue_destroy() once the @c fin was fully written. */
671  queue->finishing = GNUNET_YES;
672 }
int finishing
Did we enqueue a finish message and are closing down the queue?
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.
struct GNUNET_HashCode out_hmac
Shared secret for HMAC generation on outgoing data, ratcheted after each operation.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH
TCP communicator end of stream.
char pwrite_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for messages to be encrypted.
size_t pwrite_off
At which offset in the plaintext output buffer should we append more plaintext for encryption next...
#define GNUNET_YES
Definition: gnunet_common.h:77
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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 683 of file gnunet-communicator-tcp.c.

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

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

684 {
685  queue->timeout =
687 }
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:246
#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...
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
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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 988 of file gnunet-communicator-tcp.c.

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

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

989 {
990  struct Queue *queue = cls;
991  struct GNUNET_TIME_Relative left;
992  ssize_t rcvd;
993 
994  queue->read_task = NULL;
995  rcvd = GNUNET_NETWORK_socket_recv(queue->sock,
996  &queue->cread_buf[queue->cread_off],
997  BUF_SIZE - queue->cread_off);
998  if (-1 == rcvd)
999  {
1000  if ((EAGAIN != errno) && (EINTR != errno))
1001  {
1003  queue_finish(queue);
1004  return;
1005  }
1006  /* try again */
1007  queue->read_task =
1008  GNUNET_SCHEDULER_add_read_net(left, queue->sock, &queue_read, queue);
1009  return;
1010  }
1011  if (0 != rcvd)
1012  reschedule_queue_timeout(queue);
1013  queue->cread_off += rcvd;
1014  while ((queue->pread_off < sizeof(queue->pread_buf)) &&
1015  (queue->cread_off > 0))
1016  {
1017  size_t max = GNUNET_MIN(sizeof(queue->pread_buf) - queue->pread_off,
1018  queue->cread_off);
1019  size_t done;
1020  size_t total;
1021 
1022  GNUNET_assert(0 ==
1023  gcry_cipher_decrypt(queue->in_cipher,
1024  &queue->pread_buf[queue->pread_off],
1025  max,
1026  queue->cread_buf,
1027  max));
1028  queue->pread_off += max;
1029  total = 0;
1030  while ((GNUNET_NO == queue->rekeyed) &&
1031  (0 != (done = try_handle_plaintext(queue))))
1032  {
1033  /* 'done' bytes of plaintext were used, shift buffer */
1034  GNUNET_assert(done <= queue->pread_off);
1035  /* NOTE: this memmove() could possibly sometimes be
1036  avoided if we pass 'total' into try_handle_plaintext()
1037  and use it at an offset into the buffer there! */
1038  memmove(queue->pread_buf,
1039  &queue->pread_buf[done],
1040  queue->pread_off - done);
1041  queue->pread_off -= done;
1042  total += done;
1043  }
1044  /* when we encounter a rekey message, the decryption above uses the
1045  wrong key for everything after the rekey; in that case, we have
1046  to re-do the decryption at 'total' instead of at 'max'. If there
1047  is no rekey and the last message is incomplete (max > total),
1048  it is safe to keep the decryption so we shift by 'max' */
1049  if (GNUNET_YES == queue->rekeyed)
1050  {
1051  max = total;
1052  queue->rekeyed = GNUNET_NO;
1053  }
1054  memmove(queue->cread_buf, &queue->cread_buf[max], queue->cread_off - max);
1055  queue->cread_off -= max;
1056  }
1057 
1058  if (BUF_SIZE == queue->cread_off)
1059  return; /* buffer full, suspend reading */
1061  if (0 != left.rel_value_us)
1062  {
1063  if (max_queue_length < queue->backpressure)
1064  {
1065  /* continue reading */
1066  queue->read_task =
1067  GNUNET_SCHEDULER_add_read_net(left, queue->sock, &queue_read, queue);
1068  }
1069  return;
1070  }
1072  "Queue %p was idle for %s, disconnecting\n",
1073  queue,
1076  GNUNET_YES));
1077  queue_finish(queue);
1078 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
int rekeyed
GNUNET_YES if we just rekeyed and must thus possibly re-decrypt ciphertext.
char cread_buf[(2 *64 *1024+sizeof(struct TCPBox))]
Buffer for reading ciphertext from network into.
static void done()
size_t cread_off
At which offset in the ciphertext read buffer should we append more ciphertext for transmission next...
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:775
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define BUF_SIZE
Size of our IO buffers for ciphertext data.
#define GNUNET_NO
Definition: gnunet_common.h:78
static void queue_read(void *cls)
Queue read task.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
Handle for a queue.
#define GNUNET_MIN(a, b)
Definition: gnunet_common.h:80
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:686
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
size_t pread_off
At which offset in the plaintext input buffer should we append more plaintext from decryption next...
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
#define GNUNET_log(kind,...)
static size_t try_handle_plaintext(struct Queue *queue)
Test if we have received a full message in plaintext.
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:331
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
#define GNUNET_YES
Definition: gnunet_common.h:77
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:1467
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
char pread_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for decrypted plaintext.
Time for relative time used by GNUnet, in microseconds.
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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 707 of file gnunet-communicator-tcp.c.

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

Referenced by pass_plaintext_to_core().

708 {
709  struct Queue *queue = cls;
710 
711  if (GNUNET_OK != success)
713  "# messages lost in communicator API towards CORE",
714  1,
715  GNUNET_NO);
716  queue->backpressure--;
717  /* handle deferred queue destruction */
718  if ((queue->destroyed) && (0 == queue->backpressure))
719  {
720  GNUNET_free(queue);
721  return;
722  }
724  /* possibly unchoke reading, now that CORE made progress */
725  if (NULL == queue->read_task)
726  queue->read_task =
728  queue->timeout),
729  queue->sock,
730  &queue_read,
731  queue);
732 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
unsigned int backpressure
How may messages did we pass from this queue to CORE for which we have yet to receive an acknoweldgem...
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
int destroyed
Did we technically destroy this queue, but kept the allocation around because of backpressure not bei...
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
static void queue_read(void *cls)
Queue read task.
Handle for a queue.
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
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:331
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:1467
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
#define GNUNET_free(ptr)
Wrapper around free.
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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 745 of file gnunet-communicator-tcp.c.

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

Referenced by try_handle_plaintext().

748 {
749  const struct GNUNET_MessageHeader *hdr = plaintext;
750  int ret;
751 
752  if (ntohs(hdr->size) != plaintext_len)
753  {
754  /* NOTE: If we ever allow multiple CORE messages in one
755  BOX, this will have to change! */
756  GNUNET_break(0);
757  return;
758  }
760  &queue->target,
761  hdr,
764  queue);
765  if (GNUNET_OK == ret)
766  queue->backpressure++;
767  GNUNET_break(GNUNET_NO != ret); /* backpressure not working!? */
768  if (GNUNET_SYSERR == ret)
770  "# bytes lost due to CORE not running",
771  plaintext_len,
772  GNUNET_NO);
773 }
struct GNUNET_PeerIdentity target
To whom are we talking to.
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...
unsigned int backpressure
How may messages did we pass from this queue to CORE for which we have yet to receive an acknoweldgem...
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
static int ret
Final status code.
Definition: gnunet-arm.c:89
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
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.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
#define ADDRESS_VALIDITY_PERIOD
How long do we believe our addresses to remain up (before the other peer should revalidate).
Header for all communications.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
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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 786 of file gnunet-communicator-tcp.c.

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

Referenced by setup_in_cipher(), and setup_out_cipher().

790 {
791  char key[256 / 8];
792  char ctr[128 / 8];
793 
794  gcry_cipher_open(cipher,
795  GCRY_CIPHER_AES256 /* low level: go for speed */,
796  GCRY_CIPHER_MODE_CTR,
797  0 /* flags */);
799  sizeof(key),
800  "TCP-key",
801  strlen("TCP-key"),
802  dh,
803  sizeof(*dh),
804  pid,
805  sizeof(*pid),
806  NULL,
807  0));
808  gcry_cipher_setkey(*cipher, key, sizeof(key));
810  sizeof(ctr),
811  "TCP-ctr",
812  strlen("TCP-ctr"),
813  dh,
814  sizeof(*dh),
815  pid,
816  sizeof(*pid),
817  NULL,
818  0));
819  gcry_cipher_setctr(*cipher, ctr, sizeof(ctr));
821  GNUNET_CRYPTO_kdf(hmac_key,
822  sizeof(struct GNUNET_HashCode),
823  "TCP-hmac",
824  strlen("TCP-hmac"),
825  dh,
826  sizeof(*dh),
827  pid,
828  sizeof(*pid),
829  NULL,
830  0));
831 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
A 512-bit hashcode.
struct GNUNET_HashCode key
The key used in the DHT.
#define GNUNET_YES
Definition: gnunet_common.h:77
int 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:91
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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 841 of file gnunet-communicator-tcp.c.

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

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

843 {
844  struct GNUNET_HashCode dh;
845 
846  GNUNET_CRYPTO_eddsa_ecdh(my_private_key, ephemeral, &dh);
847  setup_cipher(&dh, &my_identity, &queue->in_cipher, &queue->in_hmac);
848 }
struct GNUNET_HashCode in_hmac
Shared secret for HMAC verification on incoming data.
static struct GNUNET_PeerIdentity my_identity
Our public key.
int 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:1505
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private 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.
A 512-bit hashcode.
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
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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 860 of file gnunet-communicator-tcp.c.

References TcpHandshakeSignature::ephemeral, TCPRekey::ephemeral, GNUNET_break, GNUNET_CRYPTO_eddsa_verify(), GNUNET_OK, GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY, GNUNET_YES, Queue::in_cipher, TcpHandshakeSignature::monotonic_time, TCPRekey::monotonic_time, my_identity, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, queue_finish(), TcpHandshakeSignature::receiver, Queue::rekeyed, TcpHandshakeSignature::sender, TCPRekey::sender_sig, setup_in_cipher(), GNUNET_CRYPTO_EccSignaturePurpose::size, and Queue::target.

Referenced by try_handle_plaintext().

861 {
862  struct TcpHandshakeSignature thp;
863 
865  thp.purpose.size = htonl(sizeof(thp));
866  thp.sender = queue->target;
867  thp.receiver = my_identity;
868  thp.ephemeral = rekey->ephemeral;
869  thp.monotonic_time = rekey->monotonic_time;
870  /* FIXME: check monotonic time is monotonic... */
871  if (GNUNET_OK !=
873  &thp.purpose,
874  &rekey->sender_sig,
875  &queue->target.public_key))
876  {
877  GNUNET_break(0);
878  queue_finish(queue);
879  return;
880  }
881  gcry_cipher_close(queue->in_cipher);
882  queue->rekeyed = GNUNET_YES;
883  setup_in_cipher(&rekey->ephemeral, queue);
884 }
int rekeyed
GNUNET_YES if we just rekeyed and must thus possibly re-decrypt ciphertext.
static void setup_in_cipher(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
Setup cipher of queue for decryption.
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_PeerIdentity my_identity
Our public key.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY
Signature used by TCP communicator rekey.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
int GNUNET_CRYPTO_eddsa_verify(uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EddsaSignature *sig, const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Verify EdDSA signature.
Definition: crypto_ecc.c:1116
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY.
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.
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
#define GNUNET_YES
Definition: gnunet_common.h:77
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
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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 895 of file gnunet-communicator-tcp.c.

References calculate_hmac(), do_rekey(), GNUNET_assert, GNUNET_break_op, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY, TCPFinish::hmac, TCPRekey::hmac, Queue::in_hmac, pass_plaintext_to_core(), Queue::pread_buf, Queue::pread_off, queue_destroy(), queue_finish(), size, GNUNET_MessageHeader::size, type, and GNUNET_MessageHeader::type.

Referenced by queue_read().

896 {
897  const struct GNUNET_MessageHeader *hdr =
898  (const struct GNUNET_MessageHeader *)queue->pread_buf;
899  const struct TCPBox *box = (const struct TCPBox *)queue->pread_buf;
900  const struct TCPRekey *rekey = (const struct TCPRekey *)queue->pread_buf;
901  const struct TCPFinish *fin = (const struct TCPFinish *)queue->pread_buf;
902  struct TCPRekey rekeyz;
903  struct TCPFinish finz;
904  struct GNUNET_ShortHashCode tmac;
905  uint16_t type;
906  size_t size = 0; /* make compiler happy */
907 
908  if (sizeof(*hdr) > queue->pread_off)
909  return 0; /* not even a header */
910  type = ntohs(hdr->type);
911  switch (type)
912  {
914  /* Special case: header size excludes box itself! */
915  if (ntohs(hdr->size) + sizeof(struct TCPBox) > queue->pread_off)
916  return 0;
917  calculate_hmac(&queue->in_hmac, &box[1], ntohs(hdr->size), &tmac);
918  if (0 != memcmp(&tmac, &box->hmac, sizeof(tmac)))
919  {
920  GNUNET_break_op(0);
921  queue_finish(queue);
922  return 0;
923  }
924  pass_plaintext_to_core(queue, (const void *)&box[1], ntohs(hdr->size));
925  size = ntohs(hdr->size) + sizeof(*box);
926  break;
927 
929  if (sizeof(*rekey) > queue->pread_off)
930  return 0;
931  if (ntohs(hdr->size) != sizeof(*rekey))
932  {
933  GNUNET_break_op(0);
934  queue_finish(queue);
935  return 0;
936  }
937  rekeyz = *rekey;
938  memset(&rekeyz.hmac, 0, sizeof(rekeyz.hmac));
939  calculate_hmac(&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
940  if (0 != memcmp(&tmac, &box->hmac, sizeof(tmac)))
941  {
942  GNUNET_break_op(0);
943  queue_finish(queue);
944  return 0;
945  }
946  do_rekey(queue, rekey);
947  size = ntohs(hdr->size);
948  break;
949 
951  if (sizeof(*fin) > queue->pread_off)
952  return 0;
953  if (ntohs(hdr->size) != sizeof(*fin))
954  {
955  GNUNET_break_op(0);
956  queue_finish(queue);
957  return 0;
958  }
959  finz = *fin;
960  memset(&finz.hmac, 0, sizeof(finz.hmac));
961  calculate_hmac(&queue->in_hmac, &rekeyz, sizeof(rekeyz), &tmac);
962  if (0 != memcmp(&tmac, &fin->hmac, sizeof(tmac)))
963  {
964  GNUNET_break_op(0);
965  queue_finish(queue);
966  return 0;
967  }
968  /* handle FINISH by destroying queue */
969  queue_destroy(queue);
970  break;
971 
972  default:
973  GNUNET_break_op(0);
974  queue_finish(queue);
975  return 0;
976  }
977  GNUNET_assert(0 != size);
978  return size;
979 }
struct GNUNET_HashCode in_hmac
Shared secret for HMAC verification on incoming data.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY
TCP communicator rekey message.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX
TCP communicator payload box.
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.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
A 256-bit hashcode.
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
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...
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_FINISH
TCP communicator end of stream.
static void do_rekey(struct Queue *queue, const struct TCPRekey *rekey)
Handle rekey message on queue.
size_t pread_off
At which offset in the plaintext input buffer should we append more plaintext from decryption next...
static unsigned int size
Size of the "table".
Definition: peer.c:66
TCP message box.
TCP rekey message box.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
Header for all communications.
char pread_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for decrypted plaintext.
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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 1089 of file gnunet-communicator-tcp.c.

References COMMUNICATOR_CONFIG_SECTION, dummy, GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_malloc, GNUNET_memdup, GNUNET_NETWORK_test_pf(), GNUNET_NO, GNUNET_strdup, GNUNET_YES, port, and start.

Referenced by mq_init(), and run().

1090 {
1091  struct sockaddr *in;
1092  unsigned int port;
1093  char dummy[2];
1094  char *colon;
1095  char *cp;
1096 
1097  if (1 == sscanf(bindto, "%u%1s", &port, dummy))
1098  {
1099  /* interpreting value as just a PORT number */
1100  if (port > UINT16_MAX)
1101  {
1103  "BINDTO specification `%s' invalid: value too large for port\n",
1104  bindto);
1105  return NULL;
1106  }
1107  if ((GNUNET_NO == GNUNET_NETWORK_test_pf(PF_INET6)) ||
1108  (GNUNET_YES ==
1111  "DISABLE_V6")))
1112  {
1113  struct sockaddr_in *i4;
1114 
1115  i4 = GNUNET_malloc(sizeof(struct sockaddr_in));
1116  i4->sin_family = AF_INET;
1117  i4->sin_port = htons((uint16_t)port);
1118  *sock_len = sizeof(struct sockaddr_in);
1119  in = (struct sockaddr *)i4;
1120  }
1121  else
1122  {
1123  struct sockaddr_in6 *i6;
1124 
1125  i6 = GNUNET_malloc(sizeof(struct sockaddr_in6));
1126  i6->sin6_family = AF_INET6;
1127  i6->sin6_port = htons((uint16_t)port);
1128  *sock_len = sizeof(struct sockaddr_in6);
1129  in = (struct sockaddr *)i6;
1130  }
1131  return in;
1132  }
1133  cp = GNUNET_strdup(bindto);
1134  colon = strrchr(cp, ':');
1135  if (NULL != colon)
1136  {
1137  /* interpet value after colon as port */
1138  *colon = '\0';
1139  colon++;
1140  if (1 == sscanf(colon, "%u%1s", &port, dummy))
1141  {
1142  /* interpreting value as just a PORT number */
1143  if (port > UINT16_MAX)
1144  {
1146  "BINDTO specification `%s' invalid: value too large for port\n",
1147  bindto);
1148  GNUNET_free(cp);
1149  return NULL;
1150  }
1151  }
1152  else
1153  {
1154  GNUNET_log(
1156  "BINDTO specification `%s' invalid: last ':' not followed by number\n",
1157  bindto);
1158  GNUNET_free(cp);
1159  return NULL;
1160  }
1161  }
1162  else
1163  {
1164  /* interpret missing port as 0, aka pick any free one */
1165  port = 0;
1166  }
1167  {
1168  /* try IPv4 */
1169  struct sockaddr_in v4;
1170 
1171  if (1 == inet_pton(AF_INET, cp, &v4))
1172  {
1173  v4.sin_port = htons((uint16_t)port);
1174  in = GNUNET_memdup(&v4, sizeof(v4));
1175  *sock_len = sizeof(v4);
1176  GNUNET_free(cp);
1177  return in;
1178  }
1179  }
1180  {
1181  /* try IPv6 */
1182  struct sockaddr_in6 v6;
1183  const char *start;
1184 
1185  start = cp;
1186  if (('[' == *cp) && (']' == cp[strlen(cp) - 1]))
1187  {
1188  start++; /* skip over '[' */
1189  cp[strlen(cp) - 1] = '\0'; /* eat ']' */
1190  }
1191  if (1 == inet_pton(AF_INET6, start, &v6))
1192  {
1193  v6.sin6_port = htons((uint16_t)port);
1194  in = GNUNET_memdup(&v6, sizeof(v6));
1195  *sock_len = sizeof(v6);
1196  GNUNET_free(cp);
1197  return in;
1198  }
1199  }
1200  /* #5528 FIXME (feature!): maybe also try getnameinfo()? */
1201  GNUNET_free(cp);
1202  return NULL;
1203 }
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
static struct in_addr dummy
Target "dummy" address of the packet we pretend to respond to.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:81
#define GNUNET_log(kind,...)
#define GNUNET_YES
Definition: gnunet_common.h:77
int 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".
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
#define GNUNET_malloc(size)
Wrapper around malloc.
int GNUNET_NETWORK_test_pf(int pf)
Test if the given protocol family is supported by this system.
Definition: network.c:78
#define GNUNET_free(ptr)
Wrapper around free.
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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 1213 of file gnunet-communicator-tcp.c.

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

Referenced by queue_write(), and start_initial_kx_out().

1214 {
1215  struct GNUNET_HashCode dh;
1216 
1217  GNUNET_CRYPTO_ecdh_eddsa(&queue->ephemeral, &queue->target.public_key, &dh);
1218  /* we don't need the private key anymore, drop it! */
1219  memset(&queue->ephemeral, 0, sizeof(queue->ephemeral));
1220  setup_cipher(&dh, &queue->target, &queue->out_cipher, &queue->out_hmac);
1222  queue->rekey_left_bytes =
1224 }
struct GNUNET_PeerIdentity target
To whom are we talking to.
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Random on unsigned 64-bit values.
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:246
uint64_t rekey_left_bytes
How many more bytes may we sent with the current out_cipher before we should rekey?
struct GNUNET_TIME_Absolute rekey_time
Until what time may we sent with the current out_cipher before we should rekey?
struct GNUNET_CRYPTO_EcdhePrivateKey ephemeral
Our ephemeral key.
#define REKEY_TIME_INTERVAL
How often do we rekey based on time (at least)
struct GNUNET_HashCode out_hmac
Shared secret for HMAC generation on outgoing data, ratcheted after each operation.
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.
A 512-bit hashcode.
int 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:1615
#define REKEY_MAX_BYTES
How often do we rekey based on number of bytes transmitted? (additionally randomized).
gcry_cipher_hd_t out_cipher
cipher for encryption of outgoing data.
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
struct GNUNET_CRYPTO_EddsaPublicKey public_key
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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 1234 of file gnunet-communicator-tcp.c.

References calculate_hmac(), Queue::ephemeral, TCPRekey::ephemeral, TcpHandshakeSignature::ephemeral, GNUNET_assert, GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_eddsa_sign(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY, GNUNET_OK, GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), TCPRekey::header, TCPRekey::hmac, TCPRekey::monotonic_time, TcpHandshakeSignature::monotonic_time, my_identity, Queue::out_hmac, GNUNET_CRYPTO_EccSignaturePurpose::purpose, TcpHandshakeSignature::purpose, Queue::pwrite_buf, Queue::pwrite_off, TcpHandshakeSignature::receiver, TcpHandshakeSignature::sender, TCPRekey::sender_sig, GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_MessageHeader::size, Queue::target, and GNUNET_MessageHeader::type.

Referenced by queue_write().

1235 {
1236  struct TCPRekey rekey;
1237  struct TcpHandshakeSignature thp;
1238 
1239  GNUNET_assert(0 == queue->pwrite_off);
1240  memset(&rekey, 0, sizeof(rekey));
1243  rekey.header.type = ntohs(GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY);
1244  rekey.header.size = ntohs(sizeof(rekey));
1245  GNUNET_CRYPTO_ecdhe_key_get_public(&queue->ephemeral, &rekey.ephemeral);
1246  rekey.monotonic_time =
1248  thp.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY);
1249  thp.purpose.size = htonl(sizeof(thp));
1250  thp.sender = my_identity;
1251  thp.receiver = queue->target;
1252  thp.ephemeral = rekey.ephemeral;
1253  thp.monotonic_time = rekey.monotonic_time;
1255  &thp.purpose,
1256  &rekey.sender_sig));
1257  calculate_hmac(&queue->out_hmac, &rekey, sizeof(rekey), &rekey.hmac);
1258  memcpy(queue->pwrite_buf, &rekey, sizeof(rekey));
1259  queue->pwrite_off = sizeof(rekey);
1260 }
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:632
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_PeerIdentity my_identity
Our public key.
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_REKEY
Signature used by TCP communicator rekey.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_REKEY
TCP communicator rekey message.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
int GNUNET_CRYPTO_eddsa_sign(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
EdDSA sign a given block.
Definition: crypto_ecc.c:989
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
struct GNUNET_CRYPTO_EcdhePrivateKey ephemeral
Our ephemeral key.
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.
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
struct GNUNET_HashCode out_hmac
Shared secret for HMAC generation on outgoing data, ratcheted after each operation.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
char pwrite_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for messages to be encrypted.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:303
struct GNUNET_TIME_Absolute 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:805
TCP rekey message box.
size_t pwrite_off
At which offset in the plaintext output buffer should we append more plaintext for encryption next...
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:655
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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 1270 of file gnunet-communicator-tcp.c.

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

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

1271 {
1272  struct Queue *queue = cls;
1273  ssize_t sent;
1274 
1275  queue->write_task = NULL;
1276  if (0 != queue->cwrite_off)
1277  {
1278  sent = GNUNET_NETWORK_socket_send(queue->sock,
1279  queue->cwrite_buf,
1280  queue->cwrite_off);
1281  if ((-1 == sent) && (EAGAIN != errno) && (EINTR != errno))
1282  {
1284  queue_destroy(queue);
1285  return;
1286  }
1287  if (sent > 0)
1288  {
1289  size_t usent = (size_t)sent;
1290 
1291  memmove(queue->cwrite_buf,
1292  &queue->cwrite_buf[usent],
1293  queue->cwrite_off - usent);
1294  reschedule_queue_timeout(queue);
1295  }
1296  }
1297  /* can we encrypt more? (always encrypt full messages, needed
1298  such that #mq_cancel() can work!) */
1299  if ((0 < queue->rekey_left_bytes) &&
1300  (queue->cwrite_off + queue->pwrite_off <= BUF_SIZE))
1301  {
1302  GNUNET_assert(0 ==
1303  gcry_cipher_encrypt(queue->out_cipher,
1304  &queue->cwrite_buf[queue->cwrite_off],
1305  queue->pwrite_off,
1306  queue->pwrite_buf,
1307  queue->pwrite_off));
1308  if (queue->rekey_left_bytes > queue->pwrite_off)
1309  queue->rekey_left_bytes -= queue->pwrite_off;
1310  else
1311  queue->rekey_left_bytes = 0;
1312  queue->cwrite_off += queue->pwrite_off;
1313  queue->pwrite_off = 0;
1314  }
1315  if ((0 == queue->pwrite_off) &&
1316  ((0 == queue->rekey_left_bytes) ||
1317  (0 ==
1319  {
1320  gcry_cipher_close(queue->out_cipher);
1321  setup_out_cipher(queue);
1322  inject_rekey(queue);
1323  }
1324  if ((0 == queue->pwrite_off) && (!queue->finishing) &&
1325  (queue->mq_awaits_continue))
1326  {
1327  queue->mq_awaits_continue = GNUNET_NO;
1329  }
1330  /* did we just finish writing 'finish'? */
1331  if ((0 == queue->cwrite_off) && (GNUNET_YES == queue->finishing))
1332  {
1333  queue_destroy(queue);
1334  return;
1335  }
1336  /* do we care to write more? */
1337  if ((0 < queue->cwrite_off) || (0 < queue->pwrite_off))
1338  queue->write_task =
1340  queue->sock,
1341  &queue_write,
1342  queue);
1343 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
uint64_t rel_value_us
The actual value.
int finishing
Did we enqueue a finish message and are closing down the queue?
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:804
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
uint64_t rekey_left_bytes
How many more bytes may we sent with the current out_cipher before we should rekey?
#define BUF_SIZE
Size of our IO buffers for ciphertext data.
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:1537
struct GNUNET_TIME_Absolute rekey_time
Until what time may we sent with the current out_cipher before we should rekey?
#define GNUNET_NO
Definition: gnunet_common.h:78
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
static void inject_rekey(struct Queue *queue)
Inject a struct TCPRekey message into the queue&#39;s plaintext buffer.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
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...
Handle for a queue.
size_t cwrite_off
At which offset in the ciphertext write buffer should we append more ciphertext from reading next...
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_SCHEDULER_Task * write_task
ID of write task for this connection.
char cwrite_buf[(2 *64 *1024+sizeof(struct TCPBox))]
buffer for writing ciphertext to network.
char pwrite_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for messages to be encrypted.
int mq_awaits_continue
Is MQ awaiting a GNUNET_MQ_impl_send_continue() call?
static void setup_out_cipher(struct Queue *queue)
Setup cipher for outgoing data stream based on target and our ephemeral private key.
size_t pwrite_off
At which offset in the plaintext output buffer should we append more plaintext for encryption next...
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:331
#define GNUNET_YES
Definition: gnunet_common.h:77
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:484
gcry_cipher_hd_t out_cipher
cipher for encryption of outgoing data.
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
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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 1355 of file gnunet-communicator-tcp.c.

References calculate_hmac(), Queue::finishing, GNUNET_assert, GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX, GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, TCPBox::header, TCPBox::hmac, Queue::mq, Queue::out_hmac, Queue::pread_buf, Queue::pread_off, queue(), queue_write(), GNUNET_MessageHeader::size, Queue::sock, GNUNET_MessageHeader::type, and Queue::write_task.

Referenced by boot_queue().

1358 {
1359  struct Queue *queue = impl_state;
1360  uint16_t msize = ntohs(msg->size);
1361  struct TCPBox box;
1362 
1363  GNUNET_assert(mq == queue->mq);
1364  if (GNUNET_YES == queue->finishing)
1365  return; /* this queue is dying, drop msg */
1366  GNUNET_assert(0 == queue->pread_off);
1367  box.header.type = htons(GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX);
1368  box.header.size = htons(msize);
1369  calculate_hmac(&queue->out_hmac, msg, msize, &box.hmac);
1370  memcpy(&queue->pread_buf[queue->pread_off], &box, sizeof(box));
1371  queue->pread_off += sizeof(box);
1372  memcpy(&queue->pread_buf[queue->pread_off], msg, msize);
1373  queue->pread_off += msize;
1374  GNUNET_assert(NULL != queue->sock);
1375  if (NULL == queue->write_task)
1376  queue->write_task =
1378  queue->sock,
1379  &queue_write,
1380  queue);
1381 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
int finishing
Did we enqueue a finish message and are closing down the queue?
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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:1537
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_TCP_BOX
TCP communicator payload box.
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.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
struct GNUNET_HashCode out_hmac
Shared secret for HMAC generation on outgoing data, ratcheted after each operation.
Handle for a queue.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_SCHEDULER_Task * write_task
ID of write task for this connection.
size_t pread_off
At which offset in the plaintext input buffer should we append more plaintext from decryption next...
TCP message box.
#define GNUNET_YES
Definition: gnunet_common.h:77
char pread_buf[UINT16_MAX+1+sizeof(struct TCPBox)]
Plaintext buffer for decrypted plaintext.
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
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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 1393 of file gnunet-communicator-tcp.c.

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

Referenced by boot_queue().

1394 {
1395  struct Queue *queue = impl_state;
1396 
1397  if (mq == queue->mq)
1398  {
1399  queue->mq = NULL;
1400  queue_finish(queue);
1401  }
1402 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
Handle for a queue.
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
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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 1412 of file gnunet-communicator-tcp.c.

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

Referenced by boot_queue().

1413 {
1414  struct Queue *queue = impl_state;
1415 
1416  GNUNET_assert(0 != queue->pwrite_off);
1417  queue->pwrite_off = 0;
1418 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
Handle for a queue.
size_t pwrite_off
At which offset in the plaintext output buffer should we append more plaintext for encryption next...
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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 1431 of file gnunet-communicator-tcp.c.

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

Referenced by boot_queue().

1432 {
1433  struct Queue *queue = cls;
1434 
1436  "MQ error in queue to %s: %d\n",
1437  GNUNET_i2s(&queue->target),
1438  (int)error);
1439  queue_finish(queue);
1440 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
struct GNUNET_PeerIdentity target
To whom are we talking to.
Handle for a queue.
static void queue_finish(struct Queue *queue)
Append a &#39;finish&#39; message to the outgoing transmission.
#define GNUNET_log(kind,...)
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
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◆ boot_queue()

static void boot_queue ( struct Queue queue,
enum GNUNET_TRANSPORT_ConnectionStatus  cs 
)
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 1451 of file gnunet-communicator-tcp.c.

References Queue::address, Queue::address_len, COMMUNICATOR_ADDRESS_PREFIX, GNUNET_a2s(), GNUNET_asprintf(), GNUNET_assert, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_CONTAINER_multipeermap_put(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_free, GNUNET_MQ_queue_for_callbacks(), GNUNET_NO, GNUNET_NT_scanner_get_type(), GNUNET_STATISTICS_set(), GNUNET_TIME_relative_to_absolute(), GNUNET_TRANSPORT_communicator_mq_add(), Queue::mq, mq_cancel(), mq_destroy(), mq_error(), mq_send(), Queue::nt, Queue::qh, Queue::target, and Queue::timeout.

Referenced by mq_init(), and proto_read_kx().

1452 {
1453  queue->nt =
1456  queue_map,
1457  &queue->target,
1458  queue,
1461  "# queues active",
1463  GNUNET_NO);
1464  queue->timeout =
1467  &mq_destroy,
1468  &mq_cancel,
1469  queue,
1470  NULL,
1471  &mq_error,
1472  queue);
1473  {
1474  char *foreign_addr;
1475 
1476  switch (queue->address->sa_family)
1477  {
1478  case AF_INET:
1479  GNUNET_asprintf(&foreign_addr,
1480  "%s-%s",
1482  GNUNET_a2s(queue->address, queue->address_len));
1483  break;
1484 
1485  case AF_INET6:
1486  GNUNET_asprintf(&foreign_addr,
1487  "%s-%s",
1489  GNUNET_a2s(queue->address, queue->address_len));
1490  break;
1491 
1492  default:
1493  GNUNET_assert(0);
1494  }
1496  &queue->target,
1497  foreign_addr,
1498  0 /* no MTU */,
1499  queue->nt,
1500  cs,
1501  queue->mq);
1502  GNUNET_free(foreign_addr);
1503  }
1504 }
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:306
struct GNUNET_PeerIdentity target
To whom are we talking to.
socklen_t address_len
Length of the address.
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:246
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_NO
Definition: gnunet_common.h:78
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
static struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:550
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
static void mq_destroy(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
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)...
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
static void mq_cancel(struct GNUNET_MQ_Handle *mq, void *impl_state)
Implementation function that cancels the currently sent message.
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. ...
Allow multiple values with the same key.
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
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.
struct sockaddr * address
Address of the other peer.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
enum GNUNET_TRANSPORT_ConnectionStatus cs
Connection status for this queue.
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...
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, 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...
enum GNUNET_NetworkType nt
Which network type does this queue use?
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
struct GNUNET_TRANSPORT_QueueHandle * qh
handle for this queue with the ch.
#define GNUNET_free(ptr)
Wrapper around free.
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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 1518 of file gnunet-communicator-tcp.c.

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

Referenced by start_initial_kx_out().

1520 {
1521  struct TcpHandshakeSignature ths;
1522  struct TCPConfirmation tc;
1523 
1524  memcpy(queue->cwrite_buf, epub, sizeof(*epub));
1525  queue->cwrite_off = sizeof(epub);
1526  /* compute 'tc' and append in encrypted format to cwrite_buf */
1527  tc.sender = my_identity;
1528  tc.monotonic_time =
1530  ths.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE);
1531  ths.purpose.size = htonl(sizeof(ths));
1532  ths.sender = my_identity;
1533  ths.receiver = queue->target;
1534  ths.ephemeral = *epub;
1535  ths.monotonic_time = tc.monotonic_time;
1537  &ths.purpose,
1538  &tc.sender_sig));
1539  GNUNET_assert(0 ==
1540  gcry_cipher_encrypt(queue->out_cipher,
1541  &queue->cwrite_buf[queue->cwrite_off],
1542  sizeof(tc),
1543  &tc,
1544  sizeof(tc)));
1545  queue->cwrite_off += sizeof(tc);
1546 }
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE
Signature used by TCP communicator handshake,.
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_PeerIdentity my_identity
Our public key.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:410
int GNUNET_CRYPTO_eddsa_sign(const struct GNUNET_CRYPTO_EddsaPrivateKey *priv, const struct GNUNET_CRYPTO_EccSignaturePurpose *purpose, struct GNUNET_CRYPTO_EddsaSignature *sig)
EdDSA sign a given block.
Definition: crypto_ecc.c:989
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
size_t cwrite_off
At which offset in the ciphertext write buffer should we append more ciphertext from reading next...
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
char cwrite_buf[(2 *64 *1024+sizeof(struct TCPBox))]
buffer for writing ciphertext to network.
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:805
Encrypted continuation of TCP initial handshake.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:655
gcry_cipher_hd_t out_cipher
cipher for encryption of outgoing data.
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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 1557 of file gnunet-communicator-tcp.c.

References Queue::ephemeral, GNUNET_assert, GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_OK, setup_out_cipher(), and transmit_kx().

Referenced by mq_init(), and proto_read_kx().

1558 {
1559  struct GNUNET_CRYPTO_EcdhePublicKey epub;
1560 
1564  setup_out_cipher(queue);
1565  transmit_kx(queue, &epub);
1566 }
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:632
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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...
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
struct GNUNET_CRYPTO_EcdhePrivateKey ephemeral
Our ephemeral key.
void GNUNET_CRYPTO_ecdhe_key_get_public(const struct GNUNET_CRYPTO_EcdhePrivateKey *priv, struct GNUNET_CRYPTO_EcdhePublicKey *pub)
Extract the public key for the given private key.
Definition: crypto_ecc.c:303
static void setup_out_cipher(struct Queue *queue)
Setup cipher for outgoing data stream based on target and our ephemeral private key.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
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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 1581 of file gnunet-communicator-tcp.c.

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

Referenced by proto_read_kx(), and queue_read_kx().

1584 {
1585  struct TcpHandshakeSignature ths;
1586 
1587  GNUNET_assert(
1588  0 ==
1589  gcry_cipher_decrypt(queue->in_cipher,
1590  tc,
1591  sizeof(*tc),
1592  &ibuf[sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)],
1593  sizeof(tc)));
1594  ths.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE);
1595  ths.purpose.size = htonl(sizeof(ths));
1596  ths.sender = tc->sender;
1597  ths.receiver = my_identity;
1598  memcpy(&ths.ephemeral, ibuf, sizeof(struct GNUNET_CRYPTO_EcdhePublicKey));
1599  ths.monotonic_time = tc->monotonic_time;
1600  /* FIXME: check monotonic time against previous mono times
1601  from this sender! */
1603  &ths.purpose,
1604  &tc->sender_sig,
1605  &tc->sender.public_key);
1606 }
#define GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE
Signature used by TCP communicator handshake,.
static struct GNUNET_PeerIdentity my_identity
Our public key.
struct GNUNET_PeerIdentity sender
Sender&#39;s identity.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_TCP_HANDSHAKE.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
int GNUNET_CRYPTO_eddsa_verify(uint32_t purpose, const struct GNUNET_CRYPTO_EccSignaturePurpose *validate, const struct GNUNET_CRYPTO_EddsaSignature *sig, const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Verify EdDSA signature.
Definition: crypto_ecc.c:1116
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
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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 1615 of file gnunet-communicator-tcp.c.

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

Referenced by do_shutdown(), and proto_read_kx().

1616 {
1618  GNUNET_free(pq->address);
1620  GNUNET_free(pq);
1621 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct sockaddr * address
Address of the other peer.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
static struct ProtoQueue * proto_tail
Protoqueues DLL tail.
static struct ProtoQueue * proto_head
Protoqueues DLL head.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:548
#define GNUNET_free(ptr)
Wrapper around free.
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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 1631 of file gnunet-communicator-tcp.c.

References Queue::address, ProtoQueue::address, Queue::address_len, 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_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_recv(), GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_write_net(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_CS_INBOUND, ProtoQueue::ibuf, ProtoQueue::ibuf_off, Queue::in_cipher, queue(), queue_read(), queue_write(), Queue::read_task, ProtoQueue::read_task, GNUNET_TIME_Relative::rel_value_us, TCPConfirmation::sender, setup_in_cipher(), Queue::sock, ProtoQueue::sock, start_initial_kx_out(), Queue::target, ProtoQueue::timeout, and Queue::write_task.

Referenced by listen_cb().

1632 {
1633  struct ProtoQueue *pq = cls;
1634  ssize_t rcvd;
1635  struct GNUNET_TIME_Relative left;
1636  struct Queue *queue;
1637  struct TCPConfirmation tc;
1638 
1639  pq->read_task = NULL;
1641  if (0 == left.rel_value_us)
1642  {
1643  free_proto_queue(pq);
1644  return;
1645  }
1646  rcvd = GNUNET_NETWORK_socket_recv(pq->sock,
1647  &pq->ibuf[pq->ibuf_off],
1648  sizeof(pq->ibuf) - pq->ibuf_off);
1649  if (-1 == rcvd)
1650  {
1651  if ((EAGAIN != errno) && (EINTR != errno))
1652  {
1654  free_proto_queue(pq);
1655  return;
1656  }
1657  /* try again */
1658  pq->read_task =
1660  return;
1661  }
1662  pq->ibuf_off += rcvd;
1663  if (pq->ibuf_off > sizeof(pq->ibuf))
1664  {
1665  /* read more */
1666  pq->read_task =
1668  return;
1669  }
1670  /* we got all the data, let's find out who we are talking to! */
1671  queue = GNUNET_new(struct Queue);
1673  queue);
1674  if (GNUNET_OK != decrypt_and_check_tc(queue, &tc, pq->ibuf))
1675  {
1677  "Invalid TCP KX received from %s\n",
1678  GNUNET_a2s(queue->address, queue->address_len));
1679  gcry_cipher_close(queue->in_cipher);
1680  GNUNET_free(queue);
1681  free_proto_queue(pq);
1682  return;
1683  }
1684  queue->address = pq->address; /* steals reference */
1685  queue->address_len = pq->address_len;
1686  queue->target = tc.sender;
1687  start_initial_kx_out(queue);
1689  queue->read_task =
1691  queue->sock,
1692  &queue_read,
1693  queue);
1694  queue->write_task =
1696  queue->sock,
1697  &queue_write,
1698  queue);
1700  GNUNET_free(pq);
1701 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
static void setup_in_cipher(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
Setup cipher of queue for decryption.
static void boot_queue(struct Queue *queue, enum GNUNET_TRANSPORT_ConnectionStatus cs)
Add the given queue to our internal data structure.
struct GNUNET_PeerIdentity target
To whom are we talking to.
socklen_t address_len
Length of the address.
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:775
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
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...
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:410
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:1537
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static void queue_read(void *cls)
Queue read task.
Handle for an incoming connection where we do not yet have enough information to setup a full queue...
char ibuf[(sizeof(struct GNUNET_CRYPTO_EcdhePublicKey)+sizeof(struct TCPConfirmation))]
Buffer for reading all the information we need to upgrade from protoqueue to queue.
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.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
Handle for a queue.
this is an inbound connection (communicator initiated)
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
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)...
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_TIME_Absolute timeout
Timeout for this protoqueue.
struct GNUNET_SCHEDULER_Task * write_task
ID of write task for this connection.
struct sockaddr * address
Address of the other peer.
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
static struct ProtoQueue * proto_tail
Protoqueues DLL tail.
static void start_initial_kx_out(struct Queue *queue)
Initialize our key material for outgoing transmissions and inform the other peer about it...
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
socklen_t address_len
Length of the address.
static void free_proto_queue(struct ProtoQueue *pq)
Closes socket and frees memory associated with pq.
struct sockaddr * address
Address of the other peer.
size_t ibuf_off
Current offset for reading into ibuf.
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
Encrypted continuation of TCP initial handshake.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
#define GNUNET_log(kind,...)
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:331
gcry_cipher_hd_t in_cipher
cipher for decryption of incoming data.
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:1467
static struct ProtoQueue * proto_head
Protoqueues DLL head.
#define GNUNET_free(ptr)
Wrapper around free.
Time for relative time used by GNUnet, in microseconds.
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
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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 1760 of file gnunet-communicator-tcp.c.

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

Referenced by mq_init().

1761 {
1762  struct Queue *queue = cls;
1763  ssize_t rcvd;
1764  struct GNUNET_TIME_Relative left;
1765  struct TCPConfirmation tc;
1766 
1767  queue->read_task = NULL;
1769  if (0 == left.rel_value_us)
1770  {
1771  queue_destroy(queue);
1772  return;
1773  }
1774  rcvd = GNUNET_NETWORK_socket_recv(queue->sock,
1775  &queue->cread_buf[queue->cread_off],
1776  BUF_SIZE - queue->cread_off);
1777  if (-1 == rcvd)
1778  {
1779  if ((EAGAIN != errno) && (EINTR != errno))
1780  {
1782  queue_destroy(queue);
1783  return;
1784  }
1785  queue->read_task =
1786  GNUNET_SCHEDULER_add_read_net(left, queue->sock, &queue_read_kx, queue);
1787  return;
1788  }
1789  queue->cread_off += rcvd;
1790  if (queue->cread_off < INITIAL_KX_SIZE)
1791  {
1792  /* read more */
1793  queue->read_task =
1794  GNUNET_SCHEDULER_add_read_net(left, queue->sock, &queue_read_kx, queue);
1795  return;
1796  }
1797  /* we got all the data, let's find out who we are talking to! */
1799  queue->cread_buf,
1800  queue);
1801  if (GNUNET_OK != decrypt_and_check_tc(queue, &tc, queue->cread_buf))
1802  {
1804  "Invalid TCP KX received from %s\n",
1805  GNUNET_a2s(queue->address, queue->address_len));
1806  queue_destroy(queue);
1807  return;
1808  }
1809  if (0 !=
1810  memcmp(&tc.sender, &queue->target, sizeof(struct GNUNET_PeerIdentity)))
1811  {
1813  "Invalid sender in TCP KX received from %s\n",
1814  GNUNET_a2s(queue->address, queue->address_len));
1815  queue_destroy(queue);
1816  return;
1817  }
1818 
1819  /* update queue timeout */
1820  reschedule_queue_timeout(queue);
1821  /* prepare to continue with regular read task immediately */
1822  memmove(queue->cread_buf,
1823  &queue->cread_buf[INITIAL_KX_SIZE],
1824  queue->cread_off - (INITIAL_KX_SIZE));
1825  queue->cread_off -= INITIAL_KX_SIZE;
1826  queue->read_task = GNUNET_SCHEDULER_add_now(&queue_read, queue);
1827 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
static void setup_in_cipher(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, struct Queue *queue)
Setup cipher of queue for decryption.
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...
char cread_buf[(2 *64 *1024+sizeof(struct TCPBox))]
Buffer for reading ciphertext from network into.
struct GNUNET_PeerIdentity target
To whom are we talking to.
socklen_t address_len
Length of the address.
size_t cread_off
At which offset in the ciphertext read buffer should we append more ciphertext for transmission next...
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:775
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
static struct GNUNET_SCHEDULER_TaskContext tc
Task context of the current task.
Definition: scheduler.c:410
#define BUF_SIZE
Size of our IO buffers for ciphertext data.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
static void queue_read(void *cls)
Queue read task.
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.
#define INITIAL_KX_SIZE
Size of the initial key exchange message sent first in both directions.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
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...
Handle for a queue.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1264
static void reschedule_queue_timeout(struct Queue *queue)
Increment queue timeout due to activity.
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)...
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
The identity of the host (wraps the signing key of the peer).
struct sockaddr * address
Address of the other peer.
Encrypted continuation of TCP initial handshake.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
#define GNUNET_log(kind,...)
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:331
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:1467
struct GNUNET_TIME_Absolute timeout
Timeout for this queue.
Time for relative time used by GNUnet, in microseconds.
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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 1849 of file gnunet-communicator-tcp.c.

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

Referenced by GNUNET_TRANSPORT_communicator_connect(), and run().

1850 {
1851  struct Queue *queue;
1852  const char *path;
1853  struct sockaddr *in;
1854  socklen_t in_len;
1855  struct GNUNET_NETWORK_Handle *sock;
1856 
1857  if (0 != strncmp(address,
1859  strlen(COMMUNICATOR_ADDRESS_PREFIX "-")))
1860  {
1861  GNUNET_break_op(0);
1862  return GNUNET_SYSERR;
1863  }
1864  path = &address[strlen(COMMUNICATOR_ADDRESS_PREFIX "-")];
1865  in = tcp_address_to_sockaddr(path, &in_len);
1866 
1867  sock = GNUNET_NETWORK_socket_create(in->sa_family, SOCK_STREAM, IPPROTO_TCP);
1868  if (NULL == sock)
1869  {
1871  "socket(%d) failed: %s",
1872  in->sa_family,
1873  strerror(errno));
1874  GNUNET_free(in);
1875  return GNUNET_SYSERR;
1876  }
1877  if (GNUNET_OK != GNUNET_NETWORK_socket_connect(sock, in, in_len))
1878  {
1880  "connect to `%s' failed: %s",
1881  address,
1882  strerror(errno));
1884  GNUNET_free(in);
1885  return GNUNET_SYSERR;
1886  }
1887 
1888  queue = GNUNET_new(struct Queue);
1889  queue->target = *peer;
1890  queue->address = in;
1891  queue->address_len = in_len;
1892  queue->sock = sock;
1894  queue->read_task =
1896  queue->sock,
1897  &queue_read_kx,
1898  queue);
1899  start_initial_kx_out(queue);
1900  queue->write_task =
1902  queue->sock,
1903  &queue_write,
1904  queue);
1905  return GNUNET_OK;
1906 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
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...
static void boot_queue(struct Queue *queue, enum GNUNET_TRANSPORT_ConnectionStatus cs)
Add the given queue to our internal data structure.
struct GNUNET_PeerIdentity target
To whom are we talking to.
socklen_t address_len
Length of the address.
struct GNUNET_SCHEDULER_Task * read_task
ID of read task for this connection.
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:1537
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
int 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:646
Handle for a queue.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
struct GNUNET_NETWORK_Handle * sock
socket that we transmit all data with on this queue
struct GNUNET_SCHEDULER_Task * write_task
ID of write task for this connection.
static struct sockaddr * tcp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert TCP bind specification to a struct sockaddr *
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
#define GNUNET_SYSERR
Definition: gnunet_common.h:76
static void start_initial_kx_out(struct Queue *queue)
Initialize our key material for outgoing transmissions and inform the other peer about it...
#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT
After how long do we consider a connection to a peer dead if we don&#39;t receive messages from the peer...
struct sockaddr * address
Address of the other peer.
this is an outbound connection (transport initiated)
#define GNUNET_log(kind,...)
handle to a socket
Definition: network.c:46
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:1467
static char * address
GNS address for this phone.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:548
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:900
static void queue_write(void *cls)
We have been notified that our socket is ready to write.
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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 1918 of file gnunet-communicator-tcp.c.

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

Referenced by do_shutdown().

1921 {
1922  struct Queue *queue = value;
1923 
1924  (void)cls;
1925  (void)target;
1926  queue_destroy(queue);
1927  return GNUNET_OK;
1928 }
static void queue(const char *hostname)
Add hostname to the list of requests to be made.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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 char * value
Value of the record to add/remove.
Handle for a queue.
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◆ do_shutdown()

static void do_shutdown ( void *  cls)
static

Shutdown the UNIX communicator.

Parameters
clsNULL (always)

Definition at line 1937 of file gnunet-communicator-tcp.c.

References free_proto_queue(), get_queue_delete_it(), GNUNET_break, GNUNET_CONTAINER_multipeermap_destroy(), GNUNET_CONTAINER_multipeermap_iterate(), GNUNET_free, GNUNET_NAT_unregister(), GNUNET_NETWORK_socket_close(), GNUNET_NO, GNUNET_NT_scanner_done(), GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_destroy(), and GNUNET_TRANSPORT_communicator_disconnect().

Referenced by run().

1938 {
1939  while (NULL != proto_head)
1941  if (NULL != nat)
1942  {
1944  nat = NULL;
1945  }
1946  if (NULL != listen_task)
1947  {
1949  listen_task = NULL;
1950  }
1951  if (NULL != listen_sock)
1952  {
1954  listen_sock = NULL;
1955  }
1958  if (NULL != ch)
1959  {
1961  ch = NULL;
1962  }
1963  if (NULL != stats)
1964  {
1966  stats = NULL;
1967  }
1968  if (NULL != my_private_key)
1969  {
1971  my_private_key = NULL;
1972  }
1973  if (NULL != is)
1974  {
1976  is = NULL;
1977  }
1978 }
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
static struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
void GNUNET_CONTAINER_multipeermap_destroy(struct GNUNET_CONTAINER_MultiPeerMap *map)
Destroy a hash map.
void GNUNET_TRANSPORT_communicator_disconnect(struct GNUNET_TRANSPORT_CommunicatorHandle *ch)
Disconnect from the transport service.
static struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
void GNUNET_NT_scanner_done(struct GNUNET_NT_InterfaceScanner *is)
Terminate interface scanner.
Definition: nt.c:419
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:690
static int get_queue_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all message queues to clean up.
static struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
int GNUNET_CONTAINER_multipeermap_iterate(struct GNUNET_CONTAINER_MultiPeerMap *map, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map.
static void free_proto_queue(struct ProtoQueue *pq)
Closes socket and frees memory associated with pq.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static struct ProtoQueue * proto_head
Protoqueues DLL head.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:548
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ 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 1993 of file gnunet-communicator-tcp.c.

References GNUNET_break_op.

Referenced by run().

1996 {
1997  (void)cls;
1998  (void)sender;
1999  (void)msg;
2000  GNUNET_break_op(0);
2001 }
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
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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 2018 of file gnunet-communicator-tcp.c.

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

Referenced by run().

2024 {
2025  char *my_addr;
2027 
2028  if (GNUNET_YES == add_remove)
2029  {
2030  enum GNUNET_NetworkType nt;
2031 
2032  GNUNET_asprintf(&my_addr,
2033  "%s-%s",
2035  GNUNET_a2s(addr, addrlen));
2036  nt = GNUNET_NT_scanner_get_type(is, addr, addrlen);
2037  ai =
2039  my_addr,
2040  nt,
2042  GNUNET_free(my_addr);
2043  *app_ctx = ai;
2044  }
2045  else
2046  {
2047  ai = *app_ctx;
2049  *app_ctx = NULL;
2050  }
2051 }
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:306
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...
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
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)...
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
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...
static struct GNUNET_TRANSPORT_AddressIdentifier * ai
Handle to the operation that publishes our address.
#define GNUNET_YES
Definition: gnunet_common.h:77
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
Internal representation of an address a communicator is currently providing for the transport service...
#define GNUNET_free(ptr)
Wrapper around free.
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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 2063 of file gnunet-communicator-tcp.c.

References _, COMMUNICATOR_ADDRESS_PREFIX, COMMUNICATOR_CONFIG_SECTION, DEFAULT_MAX_QUEUE_LENGTH, do_shutdown(), enc_notify_cb(), GNUNET_a2s(), GNUNET_break, GNUNET_CONFIGURATION_get_value_filename(), GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONTAINER_multipeermap_create(), GNUNET_CRYPTO_eddsa_key_create_from_configuration(), GNUNET_CRYPTO_eddsa_key_get_public(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_log, GNUNET_log_config_missing(), GNUNET_log_strerror, GNUNET_log_strerror_file, GNUNET_NAT_register(), GNUNET_NETWORK_get_fd(), GNUNET_NETWORK_socket_bind(), GNUNET_NETWORK_socket_close(), GNUNET_NETWORK_socket_create(), GNUNET_NO, GNUNET_NT_scanner_init(), GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_CC_RELIABLE, GNUNET_TRANSPORT_communicator_connect(), listen_cb(), max_queue_length, mq_init(), my_identity, nat_address_cb(), GNUNET_PeerIdentity::public_key, and tcp_address_to_sockaddr().

Referenced by main().

2067 {
2068  char *bindto;
2069  struct sockaddr *in;
2070  socklen_t in_len;
2071  struct sockaddr_storage in_sto;
2072  socklen_t sto_len;
2073 
2074  (void)cls;
2075  cfg = c;
2076  if (GNUNET_OK !=
2079  "BINDTO",
2080  &bindto))
2081  {
2084  "BINDTO");
2085  return;
2086  }
2087  if (GNUNET_OK !=
2090  "MAX_QUEUE_LENGTH",
2091  &max_queue_length))
2093 
2094  in = tcp_address_to_sockaddr(bindto, &in_len);
2095  if (NULL == in)
2096  {
2098  "Failed to setup TCP socket address with path `%s'\n",
2099  bindto);
2100  GNUNET_free(bindto);
2101  return;
2102  }
2103  listen_sock =
2104  GNUNET_NETWORK_socket_create(in->sa_family, SOCK_STREAM, IPPROTO_TCP);
2105  if (NULL == listen_sock)
2106  {
2108  GNUNET_free(in);
2109  GNUNET_free(bindto);
2110  return;
2111  }
2112  if (GNUNET_OK != GNUNET_NETWORK_socket_bind(listen_sock, in, in_len))
2113  {
2116  listen_sock = NULL;
2117  GNUNET_free(in);
2118  GNUNET_free(bindto);
2119  return;
2120  }
2121  /* We might have bound to port 0, allowing the OS to figure it out;
2122  thus, get the real IN-address from the socket */
2123  sto_len = sizeof(in_sto);
2124  if (0 != getsockname(GNUNET_NETWORK_get_fd(listen_sock),
2125  (struct sockaddr *)&in_sto,
2126  &sto_len))
2127  {
2128  memcpy(&in_sto, in, in_len);
2129  sto_len = in_len;
2130  }
2131  GNUNET_free(in);
2132  GNUNET_free(bindto);
2133  in = (struct sockaddr *)&in_sto;
2134  in_len = sto_len;
2136  "Bound to `%s'\n",
2137  GNUNET_a2s((const struct sockaddr *)&in_sto, sto_len));
2138  stats = GNUNET_STATISTICS_create("C-TCP", cfg);
2142  if (NULL == my_private_key)
2143  {
2144  GNUNET_log(
2146  _(
2147  "Transport service is lacking key configuration settings. Exiting.\n"));
2149  return;
2150  }
2152  /* start listening */
2154  listen_sock,
2155  &listen_cb,
2156  NULL);
2162  &mq_init,
2163  NULL,
2164  &enc_notify_cb,
2165  NULL);
2166  if (NULL == ch)
2167  {
2168  GNUNET_break(0);
2170  return;
2171  }
2174  IPPROTO_TCP,
2175  1 /* one address */,
2176  (const struct sockaddr **)&in,
2177  &in_len,
2178  &nat_address_cb,
2179  NULL /* FIXME: support reversal: #5529 */,
2180  NULL /* closure */);
2181 }
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
static void listen_cb(void *cls)
We have been notified that our listen socket has something to read.
Transmission is reliabile (with ACKs), i.e.
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1068
int 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.
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
static struct GNUNET_PeerIdentity my_identity
Our public key.
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, or when GNUNET_SCHEDULER_shutdown() is being invoked.
Definition: scheduler.c:1284
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
static struct GNUNET_SCHEDULER_Task * listen_task
ID of listen task.
int 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:474
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
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).
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:517
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
static unsigned long long max_queue_length
Maximum queue length before we stop reading towards the transport service.
#define GNUNET_log_strerror(level, cmd)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
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 struct GNUNET_CONTAINER_MultiPeerMap * queue_map
Queues (map from peer identity to struct Queue)
void GNUNET_log_config_missing(enum GNUNET_ErrorType kind, const char *section, const char *option)
Log error message about missing configuration option.
#define GNUNET_log_strerror_file(level, cmd, filename)
Log an error message at log-level &#39;level&#39; that indicates a failure of the command &#39;cmd&#39; with the mess...
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
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.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
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)...
static struct sockaddr * tcp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert TCP bind specification to a struct sockaddr *
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...
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:376
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:399
#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...
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:272
static struct GNUNET_NETWORK_Handle * listen_sock
Listen socket.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
#define GNUNET_log(kind,...)
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 ...
int GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
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&#39;s key from the file specified in the configuration...
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:1467
static void do_shutdown(void *cls)
Shutdown the UNIX communicator.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:548
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:900
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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 2192 of file gnunet-communicator-tcp.c.

References _, GNUNET_free, GNUNET_GETOPT_OPTION_END, GNUNET_OK, GNUNET_PROGRAM_run(), GNUNET_STRINGS_get_utf8_args(), ret, and run().

2193 {
2194  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2196  };
2197  int ret;
2198 
2199  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args(argc, argv, &argc, &argv))
2200  return 2;
2201 
2202  ret = (GNUNET_OK == GNUNET_PROGRAM_run(argc,
2203  argv,
2204  "gnunet-communicator-tcp",
2205  _("GNUnet TCP communicator"),
2206  options,
2207  &run,
2208  NULL))
2209  ? 0
2210  : 1;
2211  GNUNET_free((void *)argv);
2212  return ret;
2213 }
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.
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1439
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Definition of a command line option.
static int ret
Final status code.
Definition: gnunet-arm.c:89
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
int 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, parse options).
Definition: program.c:367
#define GNUNET_free(ptr)
Wrapper around free.
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Variable Documentation

◆ listen_task

struct GNUNET_SCHEDULER_Task* listen_task
static

ID of listen task.

Definition at line 485 of file gnunet-communicator-tcp.c.

◆ max_queue_length

unsigned long long max_queue_length
static

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

Definition at line 490 of file gnunet-communicator-tcp.c.

Referenced by run().

◆ stats

struct GNUNET_STATISTICS_Handle* stats
static

For logging statistics.

Definition at line 495 of file gnunet-communicator-tcp.c.

◆ ch

Our environment.

Definition at line 500 of file gnunet-communicator-tcp.c.

◆ queue_map

struct GNUNET_CONTAINER_MultiPeerMap* queue_map
static

Queues (map from peer identity to struct Queue)

Definition at line 505 of file gnunet-communicator-tcp.c.

◆ listen_sock

struct GNUNET_NETWORK_Handle* listen_sock
static

Listen socket.

Definition at line 510 of file gnunet-communicator-tcp.c.

◆ my_identity

struct GNUNET_PeerIdentity my_identity
static

Our public key.

Definition at line 515 of file gnunet-communicator-tcp.c.

Referenced by decrypt_and_check_tc(), do_rekey(), inject_rekey(), run(), setup_in_cipher(), and transmit_kx().

◆ my_private_key

struct GNUNET_CRYPTO_EddsaPrivateKey* my_private_key
static

Our private key.

Definition at line 520 of file gnunet-communicator-tcp.c.

◆ cfg

const struct GNUNET_CONFIGURATION_Handle* cfg
static

Our configuration.

Definition at line 525 of file gnunet-communicator-tcp.c.

◆ is

struct GNUNET_NT_InterfaceScanner* is
static

◆ nat

struct GNUNET_NAT_Handle* nat
static

Connection to NAT service.

Definition at line 535 of file gnunet-communicator-tcp.c.

◆ proto_head

struct ProtoQueue* proto_head
static

Protoqueues DLL head.

Definition at line 540 of file gnunet-communicator-tcp.c.

◆ proto_tail

struct ProtoQueue* proto_tail
static

Protoqueues DLL tail.

Definition at line 545 of file gnunet-communicator-tcp.c.