GNUnet  0.11.x
Data Structures | Macros | Functions | Variables
gnunet-communicator-udp.c File Reference

Transport plugin using UDP. 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_application_service.h"
#include "gnunet_transport_communication_service.h"
Include dependency graph for gnunet-communicator-udp.c:

Go to the source code of this file.

Data Structures

struct  UdpHandshakeSignature
 Signature we use to verify that the ephemeral key was really chosen by the specified sender. More...
 
struct  InitialKX
 "Plaintext" header at beginning of KX message. More...
 
struct  UDPConfirmation
 Encrypted continuation of UDP initial handshake, followed by message header with payload. More...
 
struct  UDPAck
 UDP key acknowledgement. More...
 
struct  UdpBroadcastSignature
 Signature we use to verify that the broadcast was really made by the peer that claims to have made it. More...
 
struct  UDPBroadcast
 Broadcast by peer in LAN announcing its presence. More...
 
struct  UDPBox
 UDP message box. More...
 
struct  KeyCacheEntry
 Pre-generated "kid" code (key and IV identification code) to quickly derive master key for a struct UDPBox. More...
 
struct  SharedSecret
 Shared secret we generated for a particular sender or receiver. More...
 
struct  SenderAddress
 Information we track per sender address we have recently been in contact with (we decrypt messages from the sender). More...
 
struct  ReceiverAddress
 Information we track per receiving address we have recently been in contact with (encryption to receiver). More...
 
struct  BroadcastInterface
 Interface we broadcast our presence on. More...
 
struct  SearchContext
 Context information to be used while searching for operation contexts. More...
 

Macros

#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 BROADCAST_FREQUENCY   GNUNET_TIME_UNIT_MINUTES
 How often do we broadcast our presence on the LAN? More...
 
#define INTERFACE_SCAN_FREQUENCY   GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
 How often do we scan for changes to our network interfaces? More...
 
#define ADDRESS_VALIDITY_PERIOD   GNUNET_TIME_UNIT_HOURS
 How long do we believe our addresses to remain up (before the other peer should revalidate). More...
 
#define AES_KEY_SIZE   (256 / 8)
 AES key size. More...
 
#define AES_IV_SIZE   (96 / 8)
 AES (GCM) IV size. More...
 
#define GCM_TAG_SIZE   (128 / 8)
 Size of the GCM tag. More...
 
#define KCN_THRESHOLD   92
 If we fall below this number of available KCNs, we generate additional ACKs until we reach KCN_TARGET. More...
 
#define KCN_TARGET   128
 How many KCNs do we keep around after we hit the KCN_THRESHOLD? Should be larger than KCN_THRESHOLD so we do not generate just one ACK at the time. More...
 
#define MAX_SQN_DELTA   160
 What is the maximum delta between KCN sequence numbers that we allow. More...
 
#define MAX_SECRETS   128
 How many shared master secrets do we keep around at most per sender? Should be large enough so that we generally have a chance of sending an ACK before the sender already rotated out the master secret. More...
 
#define REKEY_MAX_BYTES   (1024LLU * 1024 * 1024 * 4LLU)
 How often do we rekey based on number of bytes transmitted? (additionally randomized). More...
 
#define COMMUNICATOR_ADDRESS_PREFIX   "udp"
 Address prefix used by the communicator. More...
 
#define COMMUNICATOR_CONFIG_SECTION   "communicator-udp"
 Configuration section used by the communicator. More...
 

Functions

static void bi_destroy (struct BroadcastInterface *bi)
 An interface went away, stop broadcasting on it. More...
 
static void receiver_destroy (struct ReceiverAddress *receiver)
 Destroys a receiving state due to timeout or shutdown. More...
 
static void kce_destroy (struct KeyCacheEntry *kce)
 Free memory used by key cache entry. More...
 
static void get_kid (const struct GNUNET_HashCode *msec, uint32_t serial, struct GNUNET_ShortHashCode *kid)
 Compute kid. More...
 
static void kce_generate (struct SharedSecret *ss, uint32_t seq)
 Setup key cache entry for sequence number seq and shared secret ss. More...
 
static void secret_destroy (struct SharedSecret *ss)
 Destroy ss and associated key cache entries. More...
 
static void sender_destroy (struct SenderAddress *sender)
 Functions with this signature are called whenever we need to close a sender's state due to timeout. More...
 
static void get_iv_key (const struct GNUNET_HashCode *msec, uint32_t serial, char key[(256/8)], char iv[(96/8)])
 Compute key and iv. More...
 
static void reschedule_sender_timeout (struct SenderAddress *sender)
 Increment sender timeout due to activity. More...
 
static void reschedule_receiver_timeout (struct ReceiverAddress *receiver)
 Increment receiver timeout due to activity. More...
 
static void check_timeouts (void *cls)
 Task run to check #receiver_heap and #sender_heap for timeouts. More...
 
static void calculate_cmac (struct SharedSecret *ss)
 Calcualte cmac from master in ss. More...
 
static void pass_plaintext_to_core (struct SenderAddress *sender, const void *plaintext, size_t plaintext_len)
 We received plaintext_len bytes of plaintext from a sender. More...
 
static void setup_cipher (const struct GNUNET_HashCode *msec, uint32_t serial, gcry_cipher_hd_t *cipher)
 Setup cipher based on shared secret msec and serial number serial. More...
 
static int try_decrypt (const struct SharedSecret *ss, const char tag[(128/8)], uint32_t serial, const char *in_buf, size_t in_buf_size, char *out_buf)
 Try to decrypt buf using shared secret ss and key/iv derived using serial. More...
 
static struct SharedSecretsetup_shared_secret_dec (const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral)
 Setup shared secret for decryption. More...
 
static struct SharedSecretsetup_shared_secret_enc (const struct GNUNET_CRYPTO_EcdhePrivateKey *ephemeral, struct ReceiverAddress *receiver)
 Setup shared secret for encryption. More...
 
static void setup_receiver_mq (struct ReceiverAddress *receiver)
 Setup the MQ for the receiver. More...
 
static int handle_ack (void *cls, const struct GNUNET_PeerIdentity *pid, void *value)
 We received an ACK for pid. More...
 
static void try_handle_plaintext (struct SenderAddress *sender, const void *buf, size_t buf_size)
 Test if we have received a valid message in plaintext. More...
 
static void consider_ss_ack (struct SharedSecret *ss)
 We established a shared secret with a sender. More...
 
static void decrypt_box (const struct UDPBox *box, size_t box_len, struct KeyCacheEntry *kce)
 We received a box with matching kce. More...
 
static int find_sender_by_address (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
 Find existing struct SenderAddress by matching addresses. More...
 
static struct SenderAddresssetup_sender (const struct GNUNET_PeerIdentity *target, const struct sockaddr *address, socklen_t address_len)
 Create sender address for target. More...
 
static int verify_confirmation (const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, const struct UDPConfirmation *uc)
 Check signature from uc against ephemeral. More...
 
static char * sockaddr_to_udpaddr_string (const struct sockaddr *address, socklen_t address_len)
 Converts address to the address string format used by this communicator in HELLOs. More...
 
static void sock_read (void *cls)
 Socket read task. More...
 
static struct sockaddr * udp_address_to_sockaddr (const char *bindto, socklen_t *sock_len)
 Convert UDP bind specification to a struct sockaddr * More...
 
static void do_pad (gcry_cipher_hd_t out_cipher, char *dgram, size_t pad_size)
 Pad dgram by pad_size using out_cipher. 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 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_receiver_delete_it (void *cls, const struct GNUNET_PeerIdentity *target, void *value)
 Iterator over all receivers to clean up. More...
 
static int get_sender_delete_it (void *cls, const struct GNUNET_PeerIdentity *target, void *value)
 Iterator over all senders 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 a backchannel message 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 ifc_broadcast (void *cls)
 Broadcast our presence on one of our interfaces. More...
 
static int iface_proc (void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen)
 Callback function invoked for each interface found. More...
 
static void do_broadcast (void *cls)
 Scan interfaces to broadcast our presence on the LAN. 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_CONTAINER_MultiShortmapkey_cache
 Cache of pre-generated key IDs. More...
 
static struct GNUNET_SCHEDULER_Taskread_task
 ID of read task. More...
 
static struct GNUNET_SCHEDULER_Tasktimeout_task
 ID of timeout task. More...
 
static struct GNUNET_SCHEDULER_Taskbroadcast_task
 ID of master broadcast task. More...
 
static struct GNUNET_STATISTICS_Handlestats
 For logging statistics. More...
 
static struct GNUNET_TRANSPORT_CommunicatorHandlech
 Our environment. More...
 
static struct GNUNET_CONTAINER_MultiPeerMapreceivers
 Receivers (map from peer identity to struct ReceiverAddress) More...
 
static struct GNUNET_CONTAINER_MultiPeerMapsenders
 Senders (map from peer identity to struct SenderAddress) More...
 
static struct GNUNET_CONTAINER_Heapsenders_heap
 Expiration heap for senders (contains struct SenderAddress) More...
 
static struct GNUNET_CONTAINER_Heapreceivers_heap
 Expiration heap for receivers (contains struct ReceiverAddress) More...
 
static struct BroadcastInterfacebi_head
 Broadcast interface tasks. More...
 
static struct BroadcastInterfacebi_tail
 Broadcast interface tasks. More...
 
static struct GNUNET_NETWORK_Handleudp_sock
 Our socket. More...
 
static int have_v6_socket
 GNUNET_YES if udp_sock supports IPv6. 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_TRANSPORT_ApplicationHandleah
 Our handle to report addresses for validation to TRANSPORT. More...
 
static struct GNUNET_NT_InterfaceScanneris
 Network scanner to determine network types. More...
 
static struct GNUNET_NAT_Handlenat
 Connection to NAT service. More...
 
static uint16_t my_port
 Port number to which we are actually bound. More...
 

Detailed Description

Transport plugin using UDP.

Author
Christian Grothoff

TODO:

Definition in file gnunet-communicator-udp.c.

Macro Definition Documentation

◆ REKEY_TIME_INTERVAL

#define REKEY_TIME_INTERVAL   GNUNET_TIME_UNIT_DAYS

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

Definition at line 54 of file gnunet-communicator-udp.c.

◆ PROTO_QUEUE_TIMEOUT

#define PROTO_QUEUE_TIMEOUT   GNUNET_TIME_UNIT_MINUTES

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

Definition at line 59 of file gnunet-communicator-udp.c.

◆ BROADCAST_FREQUENCY

#define BROADCAST_FREQUENCY   GNUNET_TIME_UNIT_MINUTES

How often do we broadcast our presence on the LAN?

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

Referenced by ifc_broadcast().

◆ INTERFACE_SCAN_FREQUENCY

#define INTERFACE_SCAN_FREQUENCY   GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)

How often do we scan for changes to our network interfaces?

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

Referenced by do_broadcast(), and ifc_broadcast().

◆ ADDRESS_VALIDITY_PERIOD

#define ADDRESS_VALIDITY_PERIOD   GNUNET_TIME_UNIT_HOURS

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

Definition at line 76 of file gnunet-communicator-udp.c.

Referenced by pass_plaintext_to_core().

◆ AES_KEY_SIZE

#define AES_KEY_SIZE   (256 / 8)

AES key size.

Definition at line 81 of file gnunet-communicator-udp.c.

Referenced by setup_cipher().

◆ AES_IV_SIZE

#define AES_IV_SIZE   (96 / 8)

AES (GCM) IV size.

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

Referenced by get_iv_key(), and setup_cipher().

◆ GCM_TAG_SIZE

#define GCM_TAG_SIZE   (128 / 8)

Size of the GCM tag.

Definition at line 91 of file gnunet-communicator-udp.c.

◆ KCN_THRESHOLD

#define KCN_THRESHOLD   92

If we fall below this number of available KCNs, we generate additional ACKs until we reach KCN_TARGET.

Should be large enough that we don't generate ACKs all the time and still have enough time for the ACK to arrive before the sender runs out. So really this should ideally be based on the RTT.

Definition at line 102 of file gnunet-communicator-udp.c.

Referenced by consider_ss_ack().

◆ KCN_TARGET

#define KCN_TARGET   128

How many KCNs do we keep around after we hit the KCN_THRESHOLD? Should be larger than KCN_THRESHOLD so we do not generate just one ACK at the time.

Definition at line 110 of file gnunet-communicator-udp.c.

Referenced by consider_ss_ack().

◆ MAX_SQN_DELTA

#define MAX_SQN_DELTA   160

What is the maximum delta between KCN sequence numbers that we allow.

Used to expire 'ancient' KCNs that likely were dropped by the network. Must be larger than KCN_TARGET (otherwise we generate new KCNs all the time), but not too large (otherwise packet loss may cause sender to fall back to KX needlessly when sender runs out of ACK'ed KCNs due to losses).

Definition at line 121 of file gnunet-communicator-udp.c.

Referenced by consider_ss_ack().

◆ MAX_SECRETS

#define MAX_SECRETS   128

How many shared master secrets do we keep around at most per sender? Should be large enough so that we generally have a chance of sending an ACK before the sender already rotated out the master secret.

Generally values around KCN_TARGET make sense. Might make sense to adapt to RTT if we had a good measurement...

Definition at line 132 of file gnunet-communicator-udp.c.

Referenced by sock_read().

◆ 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 138 of file gnunet-communicator-udp.c.

◆ COMMUNICATOR_ADDRESS_PREFIX

#define COMMUNICATOR_ADDRESS_PREFIX   "udp"

Address prefix used by the communicator.

Definition at line 144 of file gnunet-communicator-udp.c.

Referenced by consider_ss_ack(), mq_init(), nat_address_cb(), run(), and sockaddr_to_udpaddr_string().

◆ COMMUNICATOR_CONFIG_SECTION

#define COMMUNICATOR_CONFIG_SECTION   "communicator-udp"

Configuration section used by the communicator.

Definition at line 149 of file gnunet-communicator-udp.c.

Referenced by run(), and udp_address_to_sockaddr().

Function Documentation

◆ bi_destroy()

static void bi_destroy ( struct BroadcastInterface bi)
static

An interface went away, stop broadcasting on it.

Parameters
bientity to close down

Definition at line 754 of file gnunet-communicator-udp.c.

References BroadcastInterface::ba, BroadcastInterface::broadcast_task, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_WARNING, GNUNET_free, GNUNET_free_non_null, GNUNET_log_strerror, GNUNET_NETWORK_socket_setsockopt(), GNUNET_OK, GNUNET_SCHEDULER_cancel(), BroadcastInterface::mcreq, and BroadcastInterface::sa.

Referenced by do_broadcast(), and do_shutdown().

755 {
756  if (AF_INET6 == bi->sa->sa_family)
757  {
758  /* Leave the multicast group */
760  IPPROTO_IPV6,
761  IPV6_LEAVE_GROUP,
762  &bi->mcreq,
763  sizeof(bi->mcreq)))
764  {
766  }
767  }
770  GNUNET_free (bi->sa);
771  GNUNET_free_non_null (bi->ba);
772  GNUNET_free (bi);
773 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:883
static struct BroadcastInterface * bi_tail
Broadcast interface tasks.
static struct BroadcastInterface * bi_head
Broadcast interface tasks.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
#define GNUNET_free_non_null(ptr)
Free the memory pointed to by ptr if ptr is not NULL.
struct sockaddr * ba
Broadcast address to use on the interface.
#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...
struct sockaddr * sa
Sender's address of the interface.
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
struct ipv6_mreq mcreq
If this is an IPv6 interface, this is the request we use to join/leave the group. ...
struct GNUNET_SCHEDULER_Task * broadcast_task
Task for this broadcast interface.
#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:966
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◆ receiver_destroy()

static void receiver_destroy ( struct ReceiverAddress receiver)
static

Destroys a receiving state due to timeout or shutdown.

Parameters
receiverentity to close down

Definition at line 782 of file gnunet-communicator-udp.c.

References ReceiverAddress::address, ReceiverAddress::foreign_addr, GNUNET_assert, GNUNET_CONTAINER_heap_remove_node(), GNUNET_CONTAINER_multipeermap_remove(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_i2s(), GNUNET_log, GNUNET_MQ_destroy(), GNUNET_NO, GNUNET_STATISTICS_set(), GNUNET_TRANSPORT_communicator_mq_del(), GNUNET_YES, ReceiverAddress::hn, mq, ReceiverAddress::mq, ReceiverAddress::qh, and ReceiverAddress::target.

Referenced by check_timeouts(), get_receiver_delete_it(), mq_destroy(), mq_error(), and mq_send().

783 {
784  struct GNUNET_MQ_Handle *mq;
785 
787  "Disconnecting receiver for peer `%s'\n",
788  GNUNET_i2s (&receiver->target));
789  if (NULL != (mq = receiver->mq))
790  {
791  receiver->mq = NULL;
792  GNUNET_MQ_destroy (mq);
793  }
794  if (NULL != receiver->qh)
795  {
797  receiver->qh = NULL;
798  }
801  &receiver->target,
802  receiver));
803  GNUNET_assert (receiver == GNUNET_CONTAINER_heap_remove_node (receiver->hn));
805  "# receivers active",
807  GNUNET_NO);
808  GNUNET_free (receiver->address);
809  GNUNET_free (receiver->foreign_addr);
810  GNUNET_free (receiver);
811 }
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct sockaddr * address
Address of the other peer.
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:86
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.
char * foreign_addr
Address of the receiver in the human-readable format with the COMMUNICATOR_ADDRESS_PREFIX.
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
Handle to a message queue.
Definition: mq.c:85
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
#define GNUNET_log(kind,...)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:824
#define GNUNET_YES
Definition: gnunet_common.h:85
struct GNUNET_TRANSPORT_QueueHandle * qh
handle for this queue with the ch.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
#define GNUNET_free(ptr)
Wrapper around free.
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◆ kce_destroy()

static void kce_destroy ( struct KeyCacheEntry kce)
static

Free memory used by key cache entry.

Parameters
kcethe key cache entry

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

References SharedSecret::active_kce_count, GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multishortmap_remove(), GNUNET_free, GNUNET_YES, SharedSecret::kce_head, SharedSecret::kce_tail, KeyCacheEntry::kid, and KeyCacheEntry::ss.

Referenced by consider_ss_ack(), decrypt_box(), and secret_destroy().

821 {
822  struct SharedSecret *ss = kce->ss;
823 
824  ss->active_kce_count--;
827  &kce->kid,
828  kce));
829  GNUNET_free (kce);
830 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct KeyCacheEntry * kce_head
Kept in a DLL, sorted by sequence number.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
int GNUNET_CONTAINER_multishortmap_remove(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, const void *value)
Remove the given key-value pair from the map.
struct SharedSecret * ss
Corresponding shared secret.
struct GNUNET_ShortHashCode kid
Key and IV identification code.
struct KeyCacheEntry * kce_tail
Kept in a DLL, sorted by sequence number.
Shared secret we generated for a particular sender or receiver.
unsigned int active_kce_count
Number of active KCN entries.
#define GNUNET_YES
Definition: gnunet_common.h:85
#define GNUNET_free(ptr)
Wrapper around free.
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◆ get_kid()

static void get_kid ( const struct GNUNET_HashCode msec,
uint32_t  serial,
struct GNUNET_ShortHashCode kid 
)
static

Compute kid.

Parameters
msecmaster secret for HMAC calculation
serialnumber for the smac calculation
kid[out]where to write the key ID

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

References GNUNET_CRYPTO_hkdf().

Referenced by kce_generate(), and mq_send().

844 {
845  uint32_t sid = htonl (serial);
846 
847  GNUNET_CRYPTO_hkdf (kid,
848  sizeof(*kid),
849  GCRY_MD_SHA512,
850  GCRY_MD_SHA256,
851  &sid,
852  sizeof(sid),
853  msec,
854  sizeof(*msec),
855  "UDP-KID",
856  strlen ("UDP-KID"),
857  NULL,
858  0);
859 }
int GNUNET_CRYPTO_hkdf(void *result, size_t out_len, int xtr_algo, int prf_algo, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_hkdf.c:291
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◆ kce_generate()

static void kce_generate ( struct SharedSecret ss,
uint32_t  seq 
)
static

Setup key cache entry for sequence number seq and shared secret ss.

Parameters
ssshared secret
seqsequence number for the key cache entry

Definition at line 869 of file gnunet-communicator-udp.c.

References SharedSecret::active_kce_count, get_kid(), GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_CONTAINER_multishortmap_put(), GNUNET_CONTAINER_multishortmap_size(), GNUNET_new, GNUNET_NO, GNUNET_STATISTICS_set(), SharedSecret::kce_head, SharedSecret::kce_tail, KeyCacheEntry::kid, SharedSecret::master, KeyCacheEntry::sequence_number, and KeyCacheEntry::ss.

Referenced by consider_ss_ack().

870 {
871  struct KeyCacheEntry *kce;
872 
873  GNUNET_assert (0 < seq);
874  kce = GNUNET_new (struct KeyCacheEntry);
875  kce->ss = ss;
876  kce->sequence_number = seq;
877  get_kid (&ss->master, seq, &kce->kid);
879  ss->active_kce_count++;
881  key_cache,
882  &kce->kid,
883  kce,
886  "# KIDs active",
888  GNUNET_NO);
889 }
struct KeyCacheEntry * kce_head
Kept in a DLL, sorted by sequence number.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
unsigned int GNUNET_CONTAINER_multishortmap_size(const struct GNUNET_CONTAINER_MultiShortmap *map)
Get the number of key-value pairs in the map.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
struct SharedSecret * ss
Corresponding shared secret.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_new(type)
Allocate a struct or union of the given type.
uint32_t sequence_number
Sequence number used to derive this entry from master key.
struct GNUNET_ShortHashCode kid
Key and IV identification code.
Pre-generated "kid" code (key and IV identification code) to quickly derive master key for a struct U...
struct GNUNET_HashCode master
Master shared secret.
struct KeyCacheEntry * kce_tail
Kept in a DLL, sorted by sequence number.
int GNUNET_CONTAINER_multishortmap_put(struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
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 get_kid(const struct GNUNET_HashCode *msec, uint32_t serial, struct GNUNET_ShortHashCode *kid)
Compute kid.
unsigned int active_kce_count
Number of active KCN entries.
Allow multiple values with the same key.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
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◆ secret_destroy()

static void secret_destroy ( struct SharedSecret ss)
static

Destroy ss and associated key cache entries.

Parameters
ssshared secret to destroy

Definition at line 898 of file gnunet-communicator-udp.c.

References ReceiverAddress::acks_available, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_multishortmap_size(), GNUNET_free, GNUNET_NO, GNUNET_STATISTICS_set(), GNUNET_STATISTICS_update(), kce_destroy(), SharedSecret::kce_head, SenderAddress::num_secrets, ReceiverAddress::num_secrets, SharedSecret::receiver, UdpHandshakeSignature::receiver, SharedSecret::sender, UdpHandshakeSignature::sender, SharedSecret::sequence_allowed, SharedSecret::sequence_used, SenderAddress::ss_head, ReceiverAddress::ss_head, SenderAddress::ss_tail, and ReceiverAddress::ss_tail.

Referenced by sock_read().

899 {
900  struct SenderAddress *sender;
901  struct ReceiverAddress *receiver;
902  struct KeyCacheEntry *kce;
903 
904  if (NULL != (sender = ss->sender))
905  {
906  GNUNET_CONTAINER_DLL_remove (sender->ss_head, sender->ss_tail, ss);
907  sender->num_secrets--;
908  }
909  if (NULL != (receiver = ss->receiver))
910  {
911  GNUNET_CONTAINER_DLL_remove (receiver->ss_head, receiver->ss_tail, ss);
912  receiver->num_secrets--;
913  receiver->acks_available -= (ss->sequence_allowed - ss->sequence_used);
914  }
915  while (NULL != (kce = ss->kce_head))
916  kce_destroy (kce);
917  GNUNET_STATISTICS_update (stats, "# Secrets active", -1, GNUNET_NO);
919  "# KIDs active",
921  GNUNET_NO);
922  GNUNET_free (ss);
923 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct SharedSecret * ss_tail
Shared secrets we used with target, last used is tail.
struct KeyCacheEntry * kce_head
Kept in a DLL, sorted by sequence number.
unsigned int GNUNET_CONTAINER_multishortmap_size(const struct GNUNET_CONTAINER_MultiShortmap *map)
Get the number of key-value pairs in the map.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
uint32_t sequence_allowed
Up to which sequence number did the other peer allow us to use this key, or up to which number did we...
unsigned int num_secrets
Length of the DLL at ss_head.
#define GNUNET_NO
Definition: gnunet_common.h:86
static void kce_destroy(struct KeyCacheEntry *kce)
Free memory used by key cache entry.
struct SenderAddress * sender
Sender we use this shared secret with, or NULL.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct SharedSecret * ss_head
Shared secrets we used with target, first used is head.
Pre-generated "kid" code (key and IV identification code) to quickly derive master key for a struct U...
uint32_t sequence_used
Up to which sequence number did we use this master already? (for encrypting only) ...
struct SharedSecret * ss_tail
Shared secrets we received with target, last used is tail.
void GNUNET_STATISTICS_set(struct GNUNET_STATISTICS_Handle *handle, const char *name, uint64_t value, int make_persistent)
Set statistic value for the peer.
Information we track per receiving address we have recently been in contact with (encryption to recei...
unsigned int num_secrets
Length of the DLL at ss_head.
unsigned int acks_available
Number of BOX keys from ACKs we have currently available for this receiver.
struct ReceiverAddress * receiver
Receiver we use this shared secret with, or NULL.
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
#define GNUNET_free(ptr)
Wrapper around free.
struct SharedSecret * ss_head
Shared secrets we received from target, first used is head.
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◆ sender_destroy()

static void sender_destroy ( struct SenderAddress sender)
static

Functions with this signature are called whenever we need to close a sender's state due to timeout.

Parameters
senderentity to close down

Definition at line 933 of file gnunet-communicator-udp.c.

References SenderAddress::address, GNUNET_assert, GNUNET_CONTAINER_heap_remove_node(), GNUNET_CONTAINER_multipeermap_remove(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_free, GNUNET_NO, GNUNET_STATISTICS_set(), GNUNET_YES, SenderAddress::hn, and SenderAddress::target.

Referenced by check_timeouts(), and get_sender_delete_it().

934 {
935  GNUNET_assert (
936  GNUNET_YES ==
938  GNUNET_assert (sender == GNUNET_CONTAINER_heap_remove_node (sender->hn));
940  "# senders active",
942  GNUNET_NO);
943  GNUNET_free (sender->address);
944  GNUNET_free (sender);
945 }
#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:86
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct sockaddr * address
Address of the other peer.
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_CONTAINER_MultiPeerMap * senders
Senders (map from peer identity to struct SenderAddress)
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
#define GNUNET_YES
Definition: gnunet_common.h:85
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
#define GNUNET_free(ptr)
Wrapper around free.
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◆ get_iv_key()

static void get_iv_key ( const struct GNUNET_HashCode msec,
uint32_t  serial,
char  key[(256/8)],
char  iv[(96/8)] 
)
static

Compute key and iv.

Parameters
msecmaster secret for calculation
serialnumber for the smac calculation
key[out]where to write the decrption key
iv[out]where to write the IV

Definition at line 957 of file gnunet-communicator-udp.c.

References AES_IV_SIZE, GNUNET_CRYPTO_hkdf(), key, and res.

Referenced by setup_cipher().

961 {
962  uint32_t sid = htonl (serial);
963  char res[AES_KEY_SIZE + AES_IV_SIZE];
964 
965  GNUNET_CRYPTO_hkdf (res,
966  sizeof(res),
967  GCRY_MD_SHA512,
968  GCRY_MD_SHA256,
969  &sid,
970  sizeof(sid),
971  msec,
972  sizeof(*msec),
973  "UDP-IV-KEY",
974  strlen ("UDP-IV-KEY"),
975  NULL,
976  0);
977  memcpy (key, res, AES_KEY_SIZE);
978  memcpy (iv, &res[AES_KEY_SIZE], AES_IV_SIZE);
979 }
int GNUNET_CRYPTO_hkdf(void *result, size_t out_len, int xtr_algo, int prf_algo, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_hkdf.c:291
#define AES_IV_SIZE
AES (GCM) IV size.
static int res
struct GNUNET_HashCode key
The key used in the DHT.
#define AES_KEY_SIZE
AES key size.
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◆ reschedule_sender_timeout()

static void reschedule_sender_timeout ( struct SenderAddress sender)
static

Increment sender timeout due to activity.

Parameters
senderaddress for which the timeout should be rescheduled

Definition at line 988 of file gnunet-communicator-udp.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_heap_update_cost(), GNUNET_TIME_relative_to_absolute(), SenderAddress::hn, and SenderAddress::timeout.

Referenced by setup_sender().

989 {
990  sender->timeout =
993 }
void GNUNET_CONTAINER_heap_update_cost(struct GNUNET_CONTAINER_HeapNode *node, GNUNET_CONTAINER_HeapCostType new_cost)
Updates the cost of any node in the tree.
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
struct GNUNET_TIME_Absolute timeout
Timeout for this sender.
uint64_t abs_value_us
The actual value.
#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 GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
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◆ reschedule_receiver_timeout()

static void reschedule_receiver_timeout ( struct ReceiverAddress receiver)
static

Increment receiver timeout due to activity.

Parameters
receiveraddress for which the timeout should be rescheduled

Definition at line 1002 of file gnunet-communicator-udp.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_heap_update_cost(), GNUNET_TIME_relative_to_absolute(), ReceiverAddress::hn, and ReceiverAddress::timeout.

Referenced by mq_send().

1003 {
1004  receiver->timeout =
1007  receiver->timeout.abs_value_us);
1008 }
void GNUNET_CONTAINER_heap_update_cost(struct GNUNET_CONTAINER_HeapNode *node, GNUNET_CONTAINER_HeapCostType new_cost)
Updates the cost of any node in the tree.
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
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 abs_value_us
The actual value.
#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 GNUNET_TIME_Absolute timeout
Timeout for this receiver address.
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◆ check_timeouts()

static void check_timeouts ( void *  cls)
static

Task run to check #receiver_heap and #sender_heap for timeouts.

Parameters
clsunused, NULL

Definition at line 1017 of file gnunet-communicator-udp.c.

References GNUNET_CONTAINER_heap_peek(), GNUNET_SCHEDULER_add_delayed(), GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_relative_min(), GNUNET_TIME_UNIT_FOREVER_REL, UdpHandshakeSignature::receiver, receiver_destroy(), GNUNET_TIME_Relative::rel_value_us, UdpHandshakeSignature::sender, sender_destroy(), SenderAddress::timeout, and ReceiverAddress::timeout.

Referenced by mq_init(), and setup_sender().

1018 {
1019  struct GNUNET_TIME_Relative st;
1020  struct GNUNET_TIME_Relative rt;
1021  struct GNUNET_TIME_Relative delay;
1022  struct ReceiverAddress *receiver;
1023  struct SenderAddress *sender;
1024 
1025  (void) cls;
1026  timeout_task = NULL;
1028  while (NULL != (receiver = GNUNET_CONTAINER_heap_peek (receivers_heap)))
1029  {
1031  if (0 != rt.rel_value_us)
1032  break;
1033  receiver_destroy (receiver);
1034  }
1036  while (NULL != (sender = GNUNET_CONTAINER_heap_peek (senders_heap)))
1037  {
1039  if (0 != st.rel_value_us)
1040  break;
1041  sender_destroy (sender);
1042  }
1044  if (delay.rel_value_us < GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
1046 }
uint64_t rel_value_us
The actual value.
struct GNUNET_TIME_Absolute timeout
Timeout for this sender.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
void * GNUNET_CONTAINER_heap_peek(const struct GNUNET_CONTAINER_Heap *heap)
Get element stored at the root of heap.
static void check_timeouts(void *cls)
Task run to check #receiver_heap and #sender_heap for timeouts.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
Information we track per receiving address we have recently been in contact with (encryption to recei...
struct GNUNET_TIME_Relative GNUNET_TIME_relative_min(struct GNUNET_TIME_Relative t1, struct GNUNET_TIME_Relative t2)
Return the minimum of two relative time values.
Definition: time.c:272
static struct GNUNET_CONTAINER_Heap * senders_heap
Expiration heap for senders (contains struct SenderAddress)
static struct GNUNET_TIME_Relative delay
When should dkg communication start?
static struct GNUNET_CONTAINER_Heap * receivers_heap
Expiration heap for receivers (contains struct ReceiverAddress)
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
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
static struct GNUNET_SCHEDULER_Task * st
The shutdown task.
struct GNUNET_TIME_Absolute timeout
Timeout for this receiver address.
static void sender_destroy(struct SenderAddress *sender)
Functions with this signature are called whenever we need to close a sender&#39;s state due to timeout...
Time for relative time used by GNUnet, in microseconds.
static struct GNUNET_SCHEDULER_Task * timeout_task
ID of timeout task.
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◆ calculate_cmac()

static void calculate_cmac ( struct SharedSecret ss)
static

Calcualte cmac from master in ss.

Parameters
ss[in,out]data structure to complete

Definition at line 1055 of file gnunet-communicator-udp.c.

References SharedSecret::cmac, GNUNET_CRYPTO_hkdf(), and SharedSecret::master.

Referenced by setup_shared_secret_enc(), and sock_read().

1056 {
1057  GNUNET_CRYPTO_hkdf (&ss->cmac,
1058  sizeof(ss->cmac),
1059  GCRY_MD_SHA512,
1060  GCRY_MD_SHA256,
1061  "CMAC",
1062  strlen ("CMAC"),
1063  &ss->master,
1064  sizeof(ss->master),
1065  "UDP-CMAC",
1066  strlen ("UDP-CMAC"),
1067  NULL,
1068  0);
1069 }
struct GNUNET_HashCode cmac
CMAC is used to identify master in ACKs.
int GNUNET_CRYPTO_hkdf(void *result, size_t out_len, int xtr_algo, int prf_algo, const void *xts, size_t xts_len, const void *skm, size_t skm_len,...)
Derive key.
Definition: crypto_hkdf.c:291
struct GNUNET_HashCode master
Master shared secret.
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◆ pass_plaintext_to_core()

static void pass_plaintext_to_core ( struct SenderAddress sender,
const void *  plaintext,
size_t  plaintext_len 
)
static

We received plaintext_len bytes of plaintext from a sender.

Pass it on to CORE.

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

Definition at line 1081 of file gnunet-communicator-udp.c.

References ADDRESS_VALIDITY_PERIOD, GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_log, GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_TRANSPORT_communicator_receive(), GNUNET_MessageHeader::size, and SenderAddress::target.

Referenced by try_handle_plaintext().

1084 {
1085  const struct GNUNET_MessageHeader *hdr = plaintext;
1086  const char *pos = plaintext;
1087 
1088  while (ntohs (hdr->size) < plaintext_len)
1089  {
1091  "# bytes given to core",
1092  ntohs (hdr->size),
1093  GNUNET_NO);
1095  "Giving %u bytes to TNG\n", ntohs (hdr->size));
1098  &sender->target,
1099  hdr,
1101  NULL /* no flow control possible */
1102  ,
1103  NULL));
1104  /* move on to next message, if any */
1105  plaintext_len -= ntohs (hdr->size);
1106  if (plaintext_len < sizeof(*hdr))
1107  break;
1108  pos += ntohs (hdr->size);
1109  hdr = (const struct GNUNET_MessageHeader *) pos;
1110  // TODO for now..., we do not actually sen >1msg or have a way of telling
1111  // if we are done
1112  break;
1113  }
1115  "# bytes padding discarded",
1116  plaintext_len,
1117  GNUNET_NO);
1118 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_NO
Definition: gnunet_common.h:86
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_PeerIdentity target
To whom are we talking to.
#define GNUNET_SYSERR
Definition: gnunet_common.h:84
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.
#define ADDRESS_VALIDITY_PERIOD
How long do we believe our addresses to remain up (before the other peer should revalidate).
#define GNUNET_log(kind,...)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
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 msec,
uint32_t  serial,
gcry_cipher_hd_t *  cipher 
)
static

Setup cipher based on shared secret msec and serial number serial.

Parameters
msecmaster shared secret
serialserial number of cipher to set up
cipher[out]cipher to initialize

Definition at line 1130 of file gnunet-communicator-udp.c.

References AES_IV_SIZE, AES_KEY_SIZE, get_iv_key(), and key.

Referenced by mq_send(), and try_decrypt().

1133 {
1134  char key[AES_KEY_SIZE];
1135  char iv[AES_IV_SIZE];
1136 
1137  gcry_cipher_open (cipher,
1138  GCRY_CIPHER_AES256 /* low level: go for speed */,
1139  GCRY_CIPHER_MODE_GCM,
1140  0 /* flags */);
1141  get_iv_key (msec, serial, key, iv);
1142  gcry_cipher_setkey (*cipher, key, sizeof(key));
1143  gcry_cipher_setiv (*cipher, iv, sizeof(iv));
1144 }
#define AES_IV_SIZE
AES (GCM) IV size.
struct GNUNET_HashCode key
The key used in the DHT.
#define AES_KEY_SIZE
AES key size.
static void get_iv_key(const struct GNUNET_HashCode *msec, uint32_t serial, char key[(256/8)], char iv[(96/8)])
Compute key and iv.
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◆ try_decrypt()

static int try_decrypt ( const struct SharedSecret ss,
const char  tag[(128/8)],
uint32_t  serial,
const char *  in_buf,
size_t  in_buf_size,
char *  out_buf 
)
static

Try to decrypt buf using shared secret ss and key/iv derived using serial.

Parameters
ssshared secret
tagGCM authentication tag
serialserial number to use
in_bufinput buffer to decrypt
in_buf_sizenumber of bytes in in_buf and available in out_buf
out_bufwhere to write the result
Returns
GNUNET_OK on success

Definition at line 1160 of file gnunet-communicator-udp.c.

References GNUNET_assert, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_update(), GNUNET_SYSERR, SharedSecret::master, and setup_cipher().

Referenced by decrypt_box(), and sock_read().

1166 {
1167  gcry_cipher_hd_t cipher;
1168 
1169  setup_cipher (&ss->master, serial, &cipher);
1170  GNUNET_assert (
1171  0 ==
1172  gcry_cipher_decrypt (cipher, out_buf, in_buf_size, in_buf, in_buf_size));
1173  if (0 != gcry_cipher_checktag (cipher, tag, GCM_TAG_SIZE))
1174  {
1175  gcry_cipher_close (cipher);
1177  "# AEAD authentication failures",
1178  1,
1179  GNUNET_NO);
1180  return GNUNET_SYSERR;
1181  }
1182  gcry_cipher_close (cipher);
1183  return GNUNET_OK;
1184 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
#define GCM_TAG_SIZE
Size of the GCM tag.
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 setup_cipher(const struct GNUNET_HashCode *msec, uint32_t serial, gcry_cipher_hd_t *cipher)
Setup cipher based on shared secret msec and serial number serial.
struct GNUNET_HashCode master
Master shared secret.
#define GNUNET_SYSERR
Definition: gnunet_common.h:84
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
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◆ setup_shared_secret_dec()

static struct SharedSecret* setup_shared_secret_dec ( const struct GNUNET_CRYPTO_EcdhePublicKey ephemeral)
static

Setup shared secret for decryption.

Parameters
ephemeralephemeral key we received from the other peer
Returns
new shared secret

Definition at line 1194 of file gnunet-communicator-udp.c.

References GNUNET_CRYPTO_eddsa_ecdh(), GNUNET_new, and SharedSecret::master.

Referenced by sock_read().

1195 {
1196  struct SharedSecret *ss;
1197 
1198  ss = GNUNET_new (struct SharedSecret);
1199  GNUNET_CRYPTO_eddsa_ecdh (my_private_key, ephemeral, &ss->master);
1200  return ss;
1201 }
#define GNUNET_new(type)
Allocate a struct or union of the given type.
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:1040
struct GNUNET_HashCode master
Master shared secret.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
Shared secret we generated for a particular sender or receiver.
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◆ setup_shared_secret_enc()

static struct SharedSecret* setup_shared_secret_enc ( const struct GNUNET_CRYPTO_EcdhePrivateKey ephemeral,
struct ReceiverAddress receiver 
)
static

Setup shared secret for encryption.

Parameters
ephemeralephemeral key we are sending to the other peer
receiver[in,out]queue to initialize encryption key for
Returns
new shared secret

Definition at line 1212 of file gnunet-communicator-udp.c.

References calculate_cmac(), GNUNET_CONTAINER_DLL_insert, GNUNET_CRYPTO_ecdh_eddsa(), GNUNET_new, GNUNET_NO, GNUNET_STATISTICS_update(), SharedSecret::master, ReceiverAddress::num_secrets, GNUNET_PeerIdentity::public_key, SharedSecret::receiver, UdpHandshakeSignature::receiver, setup_receiver_mq(), ReceiverAddress::ss_head, ReceiverAddress::ss_tail, and ReceiverAddress::target.

Referenced by mq_send().

1214 {
1215  struct SharedSecret *ss;
1216 
1217  ss = GNUNET_new (struct SharedSecret);
1218  GNUNET_CRYPTO_ecdh_eddsa (ephemeral,
1219  &receiver->target.public_key,
1220  &ss->master);
1221  calculate_cmac (ss);
1222  ss->receiver = receiver;
1223  GNUNET_CONTAINER_DLL_insert (receiver->ss_head, receiver->ss_tail, ss);
1224  receiver->num_secrets++;
1225  GNUNET_STATISTICS_update (stats, "# Secrets active", 1, GNUNET_NO);
1226  return ss;
1227 }
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
unsigned int num_secrets
Length of the DLL at ss_head.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_HashCode master
Master shared secret.
struct SharedSecret * ss_tail
Shared secrets we received with target, last used is tail.
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:1101
Shared secret we generated for a particular sender or receiver.
struct ReceiverAddress * receiver
Receiver we use this shared secret with, or NULL.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static void calculate_cmac(struct SharedSecret *ss)
Calcualte cmac from master in ss.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
struct SharedSecret * ss_head
Shared secrets we received from target, first used is head.
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◆ setup_receiver_mq()

static void setup_receiver_mq ( struct ReceiverAddress receiver)
static

Setup the MQ for the receiver.

If a queue exists, the existing one is destroyed. Then the MTU is recalculated and a fresh queue is initialized.

Parameters
receiverreceiver to setup MQ for

Definition at line 2083 of file gnunet-communicator-udp.c.

References ReceiverAddress::acks_available, ReceiverAddress::address, ReceiverAddress::foreign_addr, GNUNET_assert, GNUNET_MQ_queue_for_callbacks(), GNUNET_TRANSPORT_communicator_mq_add(), GNUNET_TRANSPORT_communicator_mq_del(), GNUNET_TRANSPORT_CS_OUTBOUND, ReceiverAddress::mq, mq_cancel(), mq_destroy(), mq_error(), mq_send(), ReceiverAddress::mtu, ReceiverAddress::nt, ReceiverAddress::qh, and ReceiverAddress::target.

Referenced by handle_ack(), mq_init(), mq_send(), and setup_shared_secret_enc().

2084 {
2085  size_t base_mtu;
2086 
2087  if (NULL != receiver->qh)
2088  {
2090  receiver->qh = NULL;
2091  }
2092  GNUNET_assert (NULL == receiver->mq);
2093  switch (receiver->address->sa_family)
2094  {
2095  case AF_INET:
2096  base_mtu = 1480 /* Ethernet MTU, 1500 - Ethernet header - VLAN tag */
2097  - sizeof(struct GNUNET_TUN_IPv4Header) /* 20 */
2098  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2099  break;
2100 
2101  case AF_INET6:
2102  base_mtu = 1280 /* Minimum MTU required by IPv6 */
2103  - sizeof(struct GNUNET_TUN_IPv6Header) /* 40 */
2104  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2105  break;
2106 
2107  default:
2108  GNUNET_assert (0);
2109  break;
2110  }
2111  if (0 == receiver->acks_available)
2112  {
2113  /* MTU based on full KX messages */
2114  receiver->mtu = base_mtu - sizeof(struct InitialKX) /* 48 */
2115  - sizeof(struct UDPConfirmation); /* 104 */
2116  }
2117  else
2118  {
2119  /* MTU based on BOXed messages */
2120  receiver->mtu = base_mtu - sizeof(struct UDPBox);
2121  }
2122  /* => Effective MTU for CORE will range from 1080 (IPv6 + KX) to
2123  1404 (IPv4 + Box) bytes, depending on circumstances... */
2124  if (NULL == receiver->mq)
2126  &mq_destroy,
2127  &mq_cancel,
2128  receiver,
2129  NULL,
2130  &mq_error,
2131  receiver);
2132  receiver->qh =
2134  &receiver->target,
2135  receiver->foreign_addr,
2136  receiver->mtu,
2137  receiver->nt,
2139  receiver->mq);
2140 }
size_t mtu
MTU we allowed transport for this receiver right now.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct sockaddr * address
Address of the other peer.
UDP packet header.
Standard IPv4 header.
Encrypted continuation of UDP initial handshake, followed by message header with payload.
"Plaintext" header at beginning of KX message.
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.
char * foreign_addr
Address of the receiver in the human-readable format with the COMMUNICATOR_ADDRESS_PREFIX.
struct GNUNET_MQ_Handle * GNUNET_MQ_queue_for_callbacks(GNUNET_MQ_SendImpl send, GNUNET_MQ_DestroyImpl destroy, GNUNET_MQ_CancelImpl cancel, void *impl_state, const struct GNUNET_MQ_MessageHandler *handlers, GNUNET_MQ_ErrorHandler error_handler, void *cls)
Create a message queue for the specified handlers.
Definition: mq.c:552
enum GNUNET_NetworkType nt
Which network type does this queue use?
static void mq_destroy(struct GNUNET_MQ_Handle *mq, void *impl_state)
Signature of functions implementing the destruction of a message queue.
UDP message box.
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. ...
Standard IPv6 header.
unsigned int acks_available
Number of BOX keys from ACKs we have currently available for this receiver.
this is an outbound connection (transport initiated)
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 * qh
handle for this queue with the ch.
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...
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
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◆ handle_ack()

static int handle_ack ( void *  cls,
const struct GNUNET_PeerIdentity pid,
void *  value 
)
static

We received an ACK for pid.

Check if it is for the receiver in value and if so, handle it and return GNUNET_NO. Otherwise, return GNUNET_YES.

Parameters
clsa const struct UDPAck
pidpeer the ACK is from
valuea struct ReceiverAddress
Returns
GNUNET_YES to continue to iterate

Definition at line 1252 of file gnunet-communicator-udp.c.

References ReceiverAddress::acks_available, UDPAck::cmac, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_DLL_remove, GNUNET_NO, GNUNET_YES, SharedSecret::next, UDPAck::sequence_max, setup_receiver_mq(), ReceiverAddress::ss_head, ReceiverAddress::ss_tail, and value.

Referenced by enc_notify_cb(), and try_handle_plaintext().

1253 {
1254  const struct UDPAck *ack = cls;
1255  struct ReceiverAddress *receiver = value;
1256 
1257  (void) pid;
1258  for (struct SharedSecret *ss = receiver->ss_head; NULL != ss; ss = ss->next)
1259  {
1260  if (0 == memcmp (&ack->cmac, &ss->cmac, sizeof(struct GNUNET_HashCode)))
1261  {
1262  uint32_t allowed;
1263 
1264  allowed = ntohl (ack->sequence_max);
1265 
1266  if (allowed > ss->sequence_allowed)
1267  {
1268  receiver->acks_available += (allowed - ss->sequence_allowed);
1269  if ((allowed - ss->sequence_allowed) == receiver->acks_available)
1270  {
1271  /* we just incremented from zero => MTU change! */
1272  setup_receiver_mq (receiver);
1273  }
1274  ss->sequence_allowed = allowed;
1275  /* move ss to head to avoid discarding it anytime soon! */
1276  GNUNET_CONTAINER_DLL_remove (receiver->ss_head, receiver->ss_tail, ss);
1277  GNUNET_CONTAINER_DLL_insert (receiver->ss_head, receiver->ss_tail, ss);
1278  }
1279  return GNUNET_NO;
1280  }
1281  }
1282  return GNUNET_YES;
1283 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
#define GNUNET_NO
Definition: gnunet_common.h:86
static char * value
Value of the record to add/remove.
struct SharedSecret * ss_tail
Shared secrets we received with target, last used is tail.
A 512-bit hashcode.
static void setup_receiver_mq(struct ReceiverAddress *receiver)
Setup the MQ for the receiver.
struct SharedSecret * next
Kept in a DLL.
Information we track per receiving address we have recently been in contact with (encryption to recei...
struct GNUNET_HashCode cmac
CMAC of the base key being acknowledged.
Shared secret we generated for a particular sender or receiver.
unsigned int acks_available
Number of BOX keys from ACKs we have currently available for this receiver.
uint32_t sequence_max
Sequence acknowledgement limit.
UDP key acknowledgement.
#define GNUNET_YES
Definition: gnunet_common.h:85
struct SharedSecret * ss_head
Shared secrets we received from target, first used is head.
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◆ try_handle_plaintext()

static void try_handle_plaintext ( struct SenderAddress sender,
const void *  buf,
size_t  buf_size 
)
static

Test if we have received a valid message in plaintext.

If so, handle it.

Parameters
senderpeer to process inbound plaintext for
bufbuffer we received
buf_sizenumber of bytes in buf

Definition at line 1295 of file gnunet-communicator-udp.c.

References GNUNET_CONTAINER_multipeermap_get_multiple(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK, GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD, handle_ack(), pass_plaintext_to_core(), GNUNET_MessageHeader::size, SenderAddress::target, type, and GNUNET_MessageHeader::type.

Referenced by decrypt_box(), and sock_read().

1298 {
1299  const struct GNUNET_MessageHeader *hdr =
1300  (const struct GNUNET_MessageHeader *) buf;
1301  const struct UDPAck *ack = (const struct UDPAck *) buf;
1302  uint16_t type;
1303 
1304  if (sizeof(*hdr) > buf_size)
1305  return; /* not even a header */
1306  if (ntohs (hdr->size) > buf_size)
1307  return; /* not even a header */
1308  type = ntohs (hdr->type);
1309  switch (type)
1310  {
1312  /* lookup master secret by 'cmac', then update sequence_max */
1314  &sender->target,
1315  &handle_ack,
1316  (void *) ack);
1317  /* There could be more messages after the ACK, handle those as well */
1318  buf += ntohs (hdr->size);
1319  buf_size -= ntohs (hdr->size);
1320  pass_plaintext_to_core (sender, buf, buf_size);
1321  break;
1322 
1324  /* skip padding */
1325  break;
1326 
1327  default:
1328  pass_plaintext_to_core (sender, buf, buf_size);
1329  }
1330 }
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD
UDP communicator padding.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK
UDP KX acknowledgement.
static int handle_ack(void *cls, const struct GNUNET_PeerIdentity *pid, void *value)
We received an ACK for pid.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
static void pass_plaintext_to_core(struct SenderAddress *sender, const void *plaintext, size_t plaintext_len)
We received plaintext_len bytes of plaintext from a sender.
static char buf[2048]
UDP key acknowledgement.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
Header for all communications.
int GNUNET_CONTAINER_multipeermap_get_multiple(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map that match a particular key.
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◆ consider_ss_ack()

static void consider_ss_ack ( struct SharedSecret ss)
static

We established a shared secret with a sender.

We should try to send the sender an struct UDPAck at the next opportunity to allow the sender to use ss longer (assuming we did not yet already recently).

Parameters
ssshared secret to generate ACKs for

Definition at line 1342 of file gnunet-communicator-udp.c.

References SharedSecret::active_kce_count, UDPAck::cmac, SharedSecret::cmac, COMMUNICATOR_ADDRESS_PREFIX, GNUNET_assert, GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK, GNUNET_TRANSPORT_communicator_notify(), UDPAck::header, kce_destroy(), kce_generate(), SharedSecret::kce_head, SharedSecret::kce_tail, KCN_TARGET, KCN_THRESHOLD, MAX_SQN_DELTA, SharedSecret::sender, SharedSecret::sequence_allowed, UDPAck::sequence_max, KeyCacheEntry::sequence_number, GNUNET_MessageHeader::size, SenderAddress::target, and GNUNET_MessageHeader::type.

Referenced by decrypt_box(), and sock_read().

1343 {
1344  GNUNET_assert (NULL != ss->sender);
1345  /* drop ancient KeyCacheEntries */
1346  while ((NULL != ss->kce_head) &&
1347  (MAX_SQN_DELTA <
1349  kce_destroy (ss->kce_tail);
1350  if (ss->active_kce_count < KCN_THRESHOLD)
1351  {
1352  struct UDPAck ack;
1353 
1354  while (ss->active_kce_count < KCN_TARGET)
1355  kce_generate (ss, ++ss->sequence_allowed);
1356  ack.header.type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK);
1357  ack.header.size = htons (sizeof(ack));
1358  ack.sequence_max = htonl (ss->sequence_allowed);
1359  ack.cmac = ss->cmac;
1361  &ss->sender->target,
1363  &ack.header);
1364  }
1365 }
struct KeyCacheEntry * kce_head
Kept in a DLL, sorted by sequence number.
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK
UDP KX acknowledgement.
#define KCN_TARGET
How many KCNs do we keep around after we hit the KCN_THRESHOLD? Should be larger than KCN_THRESHOLD s...
struct GNUNET_HashCode cmac
CMAC is used to identify master in ACKs.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
uint32_t sequence_allowed
Up to which sequence number did the other peer allow us to use this key, or up to which number did we...
static void kce_destroy(struct KeyCacheEntry *kce)
Free memory used by key cache entry.
struct SenderAddress * sender
Sender we use this shared secret with, or NULL.
uint32_t sequence_number
Sequence number used to derive this entry from master key.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct KeyCacheEntry * kce_tail
Kept in a DLL, sorted by sequence number.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
unsigned int active_kce_count
Number of active KCN entries.
#define KCN_THRESHOLD
If we fall below this number of available KCNs, we generate additional ACKs until we reach KCN_TARGET...
void GNUNET_TRANSPORT_communicator_notify(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const struct GNUNET_PeerIdentity *pid, const char *comm, const struct GNUNET_MessageHeader *header)
The communicator asks the transport service to route a message via a different path to another commun...
UDP key acknowledgement.
#define MAX_SQN_DELTA
What is the maximum delta between KCN sequence numbers that we allow.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
static void kce_generate(struct SharedSecret *ss, uint32_t seq)
Setup key cache entry for sequence number seq and shared secret ss.
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◆ decrypt_box()

static void decrypt_box ( const struct UDPBox box,
size_t  box_len,
struct KeyCacheEntry kce 
)
static

We received a box with matching kce.

Decrypt and process it.

Parameters
boxthe data we received
box_lennumber of bytes in box
kcekey index to decrypt box

Definition at line 1376 of file gnunet-communicator-udp.c.

References consider_ss_ack(), UDPBox::gcm_tag, GNUNET_assert, GNUNET_NO, GNUNET_OK, GNUNET_STATISTICS_update(), kce_destroy(), SharedSecret::sender, KeyCacheEntry::sequence_number, KeyCacheEntry::ss, try_decrypt(), and try_handle_plaintext().

Referenced by sock_read().

1379 {
1380  struct SharedSecret *ss = kce->ss;
1381  char out_buf[box_len - sizeof(*box)];
1382 
1383  GNUNET_assert (NULL != ss->sender);
1384  if (GNUNET_OK != try_decrypt (ss,
1385  box->gcm_tag,
1386  kce->sequence_number,
1387  (const char *) &box[1],
1388  sizeof(out_buf),
1389  out_buf))
1390  {
1392  "# Decryption failures with valid KCE",
1393  1,
1394  GNUNET_NO);
1395  kce_destroy (kce);
1396  return;
1397  }
1398  kce_destroy (kce);
1400  "# bytes decrypted with BOX",
1401  sizeof(out_buf),
1402  GNUNET_NO);
1403  try_handle_plaintext (ss->sender, out_buf, sizeof(out_buf));
1404  consider_ss_ack (ss);
1405 }
static void consider_ss_ack(struct SharedSecret *ss)
We established a shared secret with a sender.
char gcm_tag[(128/8)]
128-bit authentication tag for the following encrypted message, from GCM.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct SharedSecret * ss
Corresponding shared secret.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
static void kce_destroy(struct KeyCacheEntry *kce)
Free memory used by key cache entry.
struct SenderAddress * sender
Sender we use this shared secret with, or NULL.
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
uint32_t sequence_number
Sequence number used to derive this entry from master key.
static void try_handle_plaintext(struct SenderAddress *sender, const void *buf, size_t buf_size)
Test if we have received a valid message in plaintext.
Shared secret we generated for a particular sender or receiver.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static int try_decrypt(const struct SharedSecret *ss, const char tag[(128/8)], uint32_t serial, const char *in_buf, size_t in_buf_size, char *out_buf)
Try to decrypt buf using shared secret ss and key/iv derived using serial.
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◆ find_sender_by_address()

static int find_sender_by_address ( void *  cls,
const struct GNUNET_PeerIdentity key,
void *  value 
)
static

Find existing struct SenderAddress by matching addresses.

Parameters
clsa struct SearchContext
keyignored, must match already
valuea struct SenderAddress
Returns
GNUNET_YES if not found (continue to search), GNUNET_NO if found

Definition at line 1439 of file gnunet-communicator-udp.c.

References SenderAddress::address, SearchContext::address, SenderAddress::address_len, SearchContext::address_len, GNUNET_NO, GNUNET_YES, sc, SearchContext::sender, UdpHandshakeSignature::sender, and value.

Referenced by setup_sender().

1442 {
1443  struct SearchContext *sc = cls;
1444  struct SenderAddress *sender = value;
1445 
1446  if ((sender->address_len == sc->address_len) &&
1447  (0 == memcmp (sender->address, sc->address, sender->address_len)))
1448  {
1449  sc->sender = sender;
1450  return GNUNET_NO; /* stop iterating! */
1451  }
1452  return GNUNET_YES;
1453 }
socklen_t address_len
Number of bytes in address.
socklen_t address_len
Length of the address.
#define GNUNET_NO
Definition: gnunet_common.h:86
static char * value
Value of the record to add/remove.
struct sockaddr * address
Address of the other peer.
static struct GNUNET_FS_SearchContext * sc
Definition: gnunet-search.c:37
Context information to be used while searching for operation contexts.
Definition: testbed_api.c:225
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
#define GNUNET_YES
Definition: gnunet_common.h:85
struct SenderAddress * sender
Return value to set if we found a match.
const struct sockaddr * address
Address we are looking for.
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◆ setup_sender()

static struct SenderAddress* setup_sender ( const struct GNUNET_PeerIdentity target,
const struct sockaddr *  address,
socklen_t  address_len 
)
static

Create sender address for target.

Note that we might already have one, so a fresh one is only allocated if one does not yet exist for address.

Parameters
targetpeer to generate address for
addresstarget address
address_lennumber of bytes in address
Returns
data structure to keep track of key material for decrypting data from target

Definition at line 1468 of file gnunet-communicator-udp.c.

References GNUNET_TIME_Absolute::abs_value_us, address, SenderAddress::address, SearchContext::address, SenderAddress::address_len, SearchContext::address_len, check_timeouts(), find_sender_by_address(), GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_CONTAINER_multipeermap_get_multiple(), GNUNET_CONTAINER_multipeermap_put(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_memdup, GNUNET_new, GNUNET_NO, GNUNET_NT_scanner_get_type(), GNUNET_SCHEDULER_add_now(), GNUNET_STATISTICS_set(), GNUNET_TIME_relative_to_absolute(), SenderAddress::hn, SenderAddress::nt, reschedule_sender_timeout(), SearchContext::sender, UdpHandshakeSignature::sender, SenderAddress::target, and SenderAddress::timeout.

Referenced by sock_read().

1471 {
1472  struct SenderAddress *sender;
1473  struct SearchContext sc = { .address = address,
1474  .address_len = address_len,
1475  .sender = NULL };
1476 
1478  target,
1480  &sc);
1481  if (NULL != sc.sender)
1482  {
1484  return sc.sender;
1485  }
1486  sender = GNUNET_new (struct SenderAddress);
1487  sender->target = *target;
1489  sender->address_len = address_len;
1491  senders,
1492  &sender->target,
1493  sender,
1496  "# senders active",
1498  GNUNET_NO);
1499  sender->timeout =
1502  sender,
1503  sender->timeout.abs_value_us);
1505  if (NULL == timeout_task)
1507  return sender;
1508 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
struct GNUNET_CONTAINER_HeapNode * GNUNET_CONTAINER_heap_insert(struct GNUNET_CONTAINER_Heap *heap, void *element, GNUNET_CONTAINER_HeapCostType cost)
Inserts a new element into the heap.
socklen_t address_len
Number of bytes in 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
socklen_t address_len
Length of the address.
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_NO
Definition: gnunet_common.h:86
#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.
struct GNUNET_TIME_Absolute timeout
Timeout for this sender.
uint64_t abs_value_us
The actual value.
static void reschedule_sender_timeout(struct SenderAddress *sender)
Increment sender timeout due to activity.
struct GNUNET_PeerIdentity target
To whom are we talking to.
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
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:1280
static void check_timeouts(void *cls)
Task run to check #receiver_heap and #sender_heap for timeouts.
struct sockaddr * address
Address of the other peer.
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_CONTAINER_Heap * senders_heap
Expiration heap for senders (contains struct SenderAddress)
static struct GNUNET_FS_SearchContext * sc
Definition: gnunet-search.c:37
static struct GNUNET_CONTAINER_MultiPeerMap * senders
Senders (map from peer identity to struct SenderAddress)
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 GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
Context information to be used while searching for operation contexts.
Definition: testbed_api.c:225
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static int find_sender_by_address(void *cls, const struct GNUNET_PeerIdentity *key, void *value)
Find existing struct SenderAddress by matching addresses.
struct SenderAddress * sender
Return value to set if we found a match.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
static char * address
GNS address for this phone.
int GNUNET_CONTAINER_multipeermap_get_multiple(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map that match a particular key.
static struct GNUNET_SCHEDULER_Task * timeout_task
ID of timeout task.
enum GNUNET_NetworkType nt
Which network type does this queue use?
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◆ verify_confirmation()

static int verify_confirmation ( const struct GNUNET_CRYPTO_EcdhePublicKey ephemeral,
const struct UDPConfirmation uc 
)
static

Check signature from uc against ephemeral.

Parameters
ephermalkey that is signed
ucsignature of claimant
Returns
GNUNET_OK if signature is valid

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

References UdpHandshakeSignature::ephemeral, GNUNET_CRYPTO_eddsa_verify(), GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE, UDPConfirmation::monotonic_time, UdpHandshakeSignature::monotonic_time, my_identity, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, UdpHandshakeSignature::purpose, UdpHandshakeSignature::receiver, UDPConfirmation::sender, UdpHandshakeSignature::sender, UDPConfirmation::sender_sig, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by sock_read().

1521 {
1522  struct UdpHandshakeSignature uhs;
1523 
1525  uhs.purpose.size = htonl (sizeof(uhs));
1526  uhs.sender = uc->sender;
1527  uhs.receiver = my_identity;
1528  uhs.ephemeral = *ephemeral;
1529  uhs.monotonic_time = uc->monotonic_time;
1532  &uhs.purpose,
1533  &uc->sender_sig,
1534  &uc->sender.public_key);
1535 }
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
static struct GNUNET_PeerIdentity my_identity
Our public key.
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE
Signature used by UDP communicator handshake.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE.
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:844
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Purpose must be GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE.
struct GNUNET_TIME_AbsoluteNBO monotonic_time
Monotonic time of sender, to possibly help detect replay attacks (if receiver persists times by sende...
struct GNUNET_PeerIdentity sender
Sender&#39;s identity.
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
Ephemeral key used by the sender.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
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◆ sockaddr_to_udpaddr_string()

static char* sockaddr_to_udpaddr_string ( const struct sockaddr *  address,
socklen_t  address_len 
)
static

Converts address to the address string format used by this communicator in HELLOs.

Parameters
addressthe address to convert, must be AF_INET or AF_INET6.
address_lennumber of bytes in address
Returns
string representation of address

Definition at line 1547 of file gnunet-communicator-udp.c.

References COMMUNICATOR_ADDRESS_PREFIX, GNUNET_a2s(), GNUNET_asprintf(), GNUNET_assert, and ret.

Referenced by mq_init(), and sock_read().

1549 {
1550  char *ret;
1551 
1552  switch (address->sa_family)
1553  {
1554  case AF_INET:
1555  GNUNET_asprintf (&ret,
1556  "%s-%s",
1558  GNUNET_a2s (address, address_len));
1559  break;
1560 
1561  case AF_INET6:
1562  GNUNET_asprintf (&ret,
1563  "%s-%s",
1565  GNUNET_a2s (address, address_len));
1566  break;
1567 
1568  default:
1569  GNUNET_assert (0);
1570  }
1571  return ret;
1572 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
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 char * address
GNS address for this phone.
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◆ sock_read()

static void sock_read ( void *  cls)
static

Socket read task.

Parameters
clsNULL

Definition at line 1581 of file gnunet-communicator-udp.c.

References buf, calculate_cmac(), consider_ss_ack(), decrypt_box(), InitialKX::ephemeral, InitialKX::gcm_tag, GNUNET_break_op, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_multishortmap_get(), GNUNET_CRYPTO_eddsa_verify(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, GNUNET_log_strerror, GNUNET_NETWORK_socket_recvfrom(), GNUNET_NO, GNUNET_NT_scanner_get_type(), GNUNET_OK, GNUNET_SCHEDULER_add_read_net(), GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST, GNUNET_STATISTICS_update(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_application_validate(), UdpBroadcastSignature::h_address, UDPBox::kid, MAX_SECRETS, nt, SenderAddress::num_secrets, GNUNET_CRYPTO_EccSignaturePurpose::purpose, UdpBroadcastSignature::purpose, secret_destroy(), UDPConfirmation::sender, UdpBroadcastSignature::sender, SharedSecret::sender, UdpHandshakeSignature::sender, setup_sender(), setup_shared_secret_dec(), GNUNET_CRYPTO_EccSignaturePurpose::size, sockaddr_to_udpaddr_string(), SenderAddress::ss_head, SenderAddress::ss_tail, try_decrypt(), try_handle_plaintext(), uc, and verify_confirmation().

Referenced by run().

1582 {
1583  struct sockaddr_storage sa;
1584  socklen_t salen = sizeof(sa);
1585  char buf[UINT16_MAX];
1586  ssize_t rcvd;
1587 
1588  (void) cls;
1590  udp_sock,
1591  &sock_read,
1592  NULL);
1594  buf,
1595  sizeof(buf),
1596  (struct sockaddr *) &sa,
1597  &salen);
1598  if (-1 == rcvd)
1599  {
1601  return;
1602  }
1604  "Read %lu bytes\n", rcvd);
1605  /* first, see if it is a UDPBox */
1606  if (rcvd > sizeof(struct UDPBox))
1607  {
1608  const struct UDPBox *box;
1609  struct KeyCacheEntry *kce;
1610 
1611  box = (const struct UDPBox *) buf;
1613  if (NULL != kce)
1614  {
1615  decrypt_box (box, (size_t) rcvd, kce);
1616  return;
1617  }
1618  }
1619 
1620  /* next, check if it is a broadcast */
1621  if (sizeof(struct UDPBroadcast) == rcvd)
1622  {
1623  const struct UDPBroadcast *ub;
1624  struct UdpBroadcastSignature uhs;
1625 
1626  ub = (const struct UDPBroadcast *) buf;
1627  uhs.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST);
1628  uhs.purpose.size = htonl (sizeof(uhs));
1629  uhs.sender = ub->sender;
1630  GNUNET_CRYPTO_hash (&sa, salen, &uhs.h_address);
1631  if (GNUNET_OK ==
1633  &uhs.purpose,
1634  &ub->sender_sig,
1635  &ub->sender.public_key))
1636  {
1637  char *addr_s;
1638  enum GNUNET_NetworkType nt;
1639 
1640  addr_s =
1641  sockaddr_to_udpaddr_string ((const struct sockaddr *) &sa, salen);
1642  GNUNET_STATISTICS_update (stats, "# broadcasts received", 1, GNUNET_NO);
1643  /* use our own mechanism to determine network type */
1644  nt =
1645  GNUNET_NT_scanner_get_type (is, (const struct sockaddr *) &sa, salen);
1646  GNUNET_TRANSPORT_application_validate (ah, &ub->sender, nt, addr_s);
1647  GNUNET_free (addr_s);
1648  return;
1649  }
1650  /* continue with KX, mostly for statistics... */
1651  }
1652 
1653 
1654  /* finally, test if it is a KX */
1655  if (rcvd < sizeof(struct UDPConfirmation) + sizeof(struct InitialKX))
1656  {
1658  "# messages dropped (no kid, too small for KX)",
1659  1,
1660  GNUNET_NO);
1661  return;
1662  }
1664  "Got KX\n");
1665  {
1666  const struct InitialKX *kx;
1667  struct SharedSecret *ss;
1668  char pbuf[rcvd - sizeof(struct InitialKX)];
1669  const struct UDPConfirmation *uc;
1670  struct SenderAddress *sender;
1671 
1672  kx = (const struct InitialKX *) buf;
1673  ss = setup_shared_secret_dec (&kx->ephemeral);
1674  if (GNUNET_OK != try_decrypt (ss,
1675  kx->gcm_tag,
1676  0,
1677  &buf[sizeof(*kx)],
1678  sizeof(pbuf),
1679  pbuf))
1680  {
1682  "Unable to decrypt tag, dropping...\n");
1683  GNUNET_free (ss);
1685  stats,
1686  "# messages dropped (no kid, AEAD decryption failed)",
1687  1,
1688  GNUNET_NO);
1689  return;
1690  }
1691  uc = (const struct UDPConfirmation *) pbuf;
1692  if (GNUNET_OK != verify_confirmation (&kx->ephemeral, uc))
1693  {
1694  GNUNET_break_op (0);
1695  GNUNET_free (ss);
1697  "# messages dropped (sender signature invalid)",
1698  1,
1699  GNUNET_NO);
1700  return;
1701  }
1702  calculate_cmac (ss);
1703  sender = setup_sender (&uc->sender, (const struct sockaddr *) &sa, salen);
1704  ss->sender = sender;
1705  GNUNET_CONTAINER_DLL_insert (sender->ss_head, sender->ss_tail, ss);
1706  sender->num_secrets++;
1707  GNUNET_STATISTICS_update (stats, "# Secrets active", 1, GNUNET_NO);
1709  "# messages decrypted without BOX",
1710  1,
1711  GNUNET_NO);
1712  try_handle_plaintext (sender, &uc[1], sizeof(pbuf) - sizeof(*uc));
1713  consider_ss_ack (ss);
1714  if (sender->num_secrets > MAX_SECRETS)
1715  secret_destroy (sender->ss_tail);
1716  }
1717 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
static void consider_ss_ack(struct SharedSecret *ss)
We established a shared secret with a sender.
struct SharedSecret * ss_tail
Shared secrets we used with target, last used is tail.
static struct GNUNET_TRANSPORT_ApplicationHandle * ah
Our handle to report addresses for validation to TRANSPORT.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
Broadcast by peer in LAN announcing its presence.
static struct SenderAddress * setup_sender(const struct GNUNET_PeerIdentity *target, const struct sockaddr *address, socklen_t address_len)
Create sender address for target.
char gcm_tag[(128/8)]
HMAC for the following encrypted message, using GCM.
static struct SharedSecret * setup_shared_secret_dec(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral)
Setup shared secret for decryption.
void GNUNET_TRANSPORT_application_validate(struct GNUNET_TRANSPORT_ApplicationHandle *ch, const struct GNUNET_PeerIdentity *peer, enum GNUNET_NetworkType nt, const char *addr)
An application (or a communicator) has received a HELLO (or other address data of another peer) and w...
struct GNUNET_CRYPTO_EcdhePublicKey ephemeral
Ephemeral key for KX.
static void secret_destroy(struct SharedSecret *ss)
Destroy ss and associated key cache entries.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
static struct GNUNET_FS_UnindexContext * uc
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
struct SenderAddress * sender
Sender we use this shared secret with, or NULL.
Encrypted continuation of UDP initial handshake, followed by message header with payload.
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 char * sockaddr_to_udpaddr_string(const struct sockaddr *address, socklen_t address_len)
Converts address to the address string format used by this communicator in HELLOs.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
"Plaintext" header at beginning of KX message.
struct GNUNET_ShortHashCode kid
Key and IV identification code.
struct SharedSecret * ss_head
Shared secrets we used with target, first used is head.
#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...
Pre-generated "kid" code (key and IV identification code) to quickly derive master key for a struct U...
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:844
static int verify_confirmation(const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral, const struct UDPConfirmation *uc)
Check signature from uc against ephemeral.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST
Signature used by UDP broadcasts.
#define MAX_SECRETS
How many shared master secrets do we keep around at most per sender? Should be large enough so that w...
static char buf[2048]
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
UDP message box.
static void sock_read(void *cls)
Socket read task.
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
static void try_handle_plaintext(struct SenderAddress *sender, const void *buf, size_t buf_size)
Test if we have received a valid message in plaintext.
Shared secret we generated for a particular sender or receiver.
unsigned int num_secrets
Length of the DLL at ss_head.
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static void decrypt_box(const struct UDPBox *box, size_t box_len, struct KeyCacheEntry *kce)
We received a box with matching kce.
struct GNUNET_PeerIdentity sender
Sender&#39;s identity.
void * GNUNET_CONTAINER_multishortmap_get(const struct GNUNET_CONTAINER_MultiShortmap *map, const struct GNUNET_ShortHashCode *key)
Given a key find a value in the map matching the key.
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
Signature we use to verify that the broadcast was really made by the peer that claims to have made it...
#define GNUNET_log(kind,...)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static struct GNUNET_SCHEDULER_Task * read_task
ID of read task.
static void calculate_cmac(struct SharedSecret *ss)
Calcualte cmac from master in ss.
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:1486
ssize_t GNUNET_NETWORK_socket_recvfrom(const struct GNUNET_NETWORK_Handle *desc, void *buffer, size_t length, struct sockaddr *src_addr, socklen_t *addrlen)
Read data from a socket (always non-blocking).
Definition: network.c:754
#define GNUNET_free(ptr)
Wrapper around free.
static int try_decrypt(const struct SharedSecret *ss, const char tag[(128/8)], uint32_t serial, const char *in_buf, size_t in_buf_size, char *out_buf)
Try to decrypt buf using shared secret ss and key/iv derived using serial.
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◆ udp_address_to_sockaddr()

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

Convert UDP 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 1728 of file gnunet-communicator-udp.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().

1729 {
1730  struct sockaddr *in;
1731  unsigned int port;
1732  char dummy[2];
1733  char *colon;
1734  char *cp;
1735 
1736  if (1 == sscanf (bindto, "%u%1s", &port, dummy))
1737  {
1738  /* interpreting value as just a PORT number */
1739  if (port > UINT16_MAX)
1740  {
1742  "BINDTO specification `%s' invalid: value too large for port\n",
1743  bindto);
1744  return NULL;
1745  }
1746  if ((GNUNET_NO == GNUNET_NETWORK_test_pf (PF_INET6)) ||
1747  (GNUNET_YES ==
1750  "DISABLE_V6")))
1751  {
1752  struct sockaddr_in *i4;
1753 
1754  i4 = GNUNET_malloc (sizeof(struct sockaddr_in));
1755  i4->sin_family = AF_INET;
1756  i4->sin_port = htons ((uint16_t) port);
1757  *sock_len = sizeof(struct sockaddr_in);
1758  in = (struct sockaddr *) i4;
1759  }
1760  else
1761  {
1762  struct sockaddr_in6 *i6;
1763 
1764  i6 = GNUNET_malloc (sizeof(struct sockaddr_in6));
1765  i6->sin6_family = AF_INET6;
1766  i6->sin6_port = htons ((uint16_t) port);
1767  *sock_len = sizeof(struct sockaddr_in6);
1768  in = (struct sockaddr *) i6;
1769  }
1770  return in;
1771  }
1772  cp = GNUNET_strdup (bindto);
1773  colon = strrchr (cp, ':');
1774  if (NULL != colon)
1775  {
1776  /* interpet value after colon as port */
1777  *colon = '\0';
1778  colon++;
1779  if (1 == sscanf (colon, "%u%1s", &port, dummy))
1780  {
1781  /* interpreting value as just a PORT number */
1782  if (port > UINT16_MAX)
1783  {
1785  "BINDTO specification `%s' invalid: value too large for port\n",
1786  bindto);
1787  GNUNET_free (cp);
1788  return NULL;
1789  }
1790  }
1791  else
1792  {
1793  GNUNET_log (
1795  "BINDTO specification `%s' invalid: last ':' not followed by number\n",
1796  bindto);
1797  GNUNET_free (cp);
1798  return NULL;
1799  }
1800  }
1801  else
1802  {
1803  /* interpret missing port as 0, aka pick any free one */
1804  port = 0;
1805  }
1806  {
1807  /* try IPv4 */
1808  struct sockaddr_in v4;
1809  if (1 == inet_pton (AF_INET, cp, &v4.sin_addr))
1810  {
1811  v4.sin_family = AF_INET;
1812  v4.sin_port = htons ((uint16_t) port);
1813 #if HAVE_SOCKADDR_IN_SIN_LEN
1814  v4.sin_len = sizeof(struct sockaddr_in);
1815 #endif
1816  in = GNUNET_memdup (&v4, sizeof(struct sockaddr_in));
1817  *sock_len = sizeof(struct sockaddr_in);
1818  GNUNET_free (cp);
1819  return in;
1820  }
1821  }
1822  {
1823  /* try IPv6 */
1824  struct sockaddr_in6 v6;
1825  const char *start;
1826 
1827  start = cp;
1828  if (('[' == *cp) && (']' == cp[strlen (cp) - 1]))
1829  {
1830  start++; /* skip over '[' */
1831  cp[strlen (cp) - 1] = '\0'; /* eat ']' */
1832  }
1833  if (1 == inet_pton (AF_INET6, start, &v6.sin6_addr))
1834  {
1835  v6.sin6_family = AF_INET6;
1836  v6.sin6_port = htons ((uint16_t) port);
1837 #if HAVE_SOCKADDR_IN_SIN_LEN
1838  v6.sin6_len = sizeof(sizeof(struct sockaddr_in6));
1839 #endif
1840  in = GNUNET_memdup (&v6, sizeof(v6));
1841  *sock_len = sizeof(v6);
1842  GNUNET_free (cp);
1843  return in;
1844  }
1845  }
1846  /* #5528 FIXME (feature!): maybe also try getnameinfo()? */
1847  GNUNET_free (cp);
1848  return NULL;
1849 }
#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:86
#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:85
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:85
#define GNUNET_free(ptr)
Wrapper around free.
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◆ do_pad()

static void do_pad ( gcry_cipher_hd_t  out_cipher,
char *  dgram,
size_t  pad_size 
)
static

Pad dgram by pad_size using out_cipher.

Parameters
out_ciphercipher to use
dgramdatagram to pad
pad_sizenumber of bytes of padding to append

Definition at line 1860 of file gnunet-communicator-udp.c.

References GNUNET_assert, GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_block(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD, and GNUNET_MessageHeader::size.

Referenced by mq_send().

1861 {
1862  char pad[pad_size];
1863 
1865  if (sizeof(pad) > sizeof(struct GNUNET_MessageHeader))
1866  {
1867  struct GNUNET_MessageHeader hdr =
1868  { .size = htons (sizeof(pad)),
1869  .type = htons (GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD) };
1870 
1871  memcpy (pad, &hdr, sizeof(hdr));
1872  }
1873  GNUNET_assert (
1874  0 ==
1875  gcry_cipher_encrypt (out_cipher, dgram, sizeof(pad), pad, sizeof(pad)));
1876 }
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_PAD
UDP communicator padding.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
void GNUNET_CRYPTO_random_block(enum GNUNET_CRYPTO_Quality mode, void *buffer, size_t length)
Fill block with a random values.
Header for all communications.
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
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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 ReceiverAddress

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

References ReceiverAddress::acks_available, ReceiverAddress::address, ReceiverAddress::address_len, do_pad(), InitialKX::ephemeral, UdpHandshakeSignature::ephemeral, InitialKX::gcm_tag, UDPBox::gcm_tag, get_kid(), GNUNET_a2s(), GNUNET_assert, GNUNET_break, GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_eddsa_sign(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_log, GNUNET_log_strerror, GNUNET_MQ_impl_send_continue(), GNUNET_NETWORK_socket_sendto(), GNUNET_OK, GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE, GNUNET_TIME_absolute_get_monotonic(), GNUNET_TIME_absolute_hton(), UDPBox::kid, SharedSecret::master, UDPConfirmation::monotonic_time, UdpHandshakeSignature::monotonic_time, ReceiverAddress::mq, ReceiverAddress::mtu, my_identity, SharedSecret::prev, GNUNET_CRYPTO_EccSignaturePurpose::purpose, UdpHandshakeSignature::purpose, UdpHandshakeSignature::receiver, receiver_destroy(), reschedule_receiver_timeout(), UDPConfirmation::sender, UdpHandshakeSignature::sender, UDPConfirmation::sender_sig, setup_cipher(), setup_receiver_mq(), setup_shared_secret_enc(), GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_MessageHeader::size, ReceiverAddress::ss_tail, ReceiverAddress::target, and uc.

Referenced by setup_receiver_mq().

1891 {
1892  struct ReceiverAddress *receiver = impl_state;
1893  uint16_t msize = ntohs (msg->size);
1894 
1895  GNUNET_assert (mq == receiver->mq);
1896  if (msize > receiver->mtu)
1897  {
1898  GNUNET_break (0);
1899  receiver_destroy (receiver);
1900  return;
1901  }
1902  reschedule_receiver_timeout (receiver);
1903 
1904  if (0 == receiver->acks_available)
1905  {
1906  /* use KX encryption method */
1907  struct UdpHandshakeSignature uhs;
1908  struct UDPConfirmation uc;
1909  struct InitialKX kx;
1910  struct GNUNET_CRYPTO_EcdhePrivateKey epriv;
1911  char dgram[receiver->mtu + sizeof(uc) + sizeof(kx)];
1912  size_t dpos;
1913  gcry_cipher_hd_t out_cipher;
1914  struct SharedSecret *ss;
1915 
1916  /* setup key material */
1918 
1919  ss = setup_shared_secret_enc (&epriv, receiver);
1920  setup_cipher (&ss->master, 0, &out_cipher);
1921  /* compute 'uc' */
1922  uc.sender = my_identity;
1923  uc.monotonic_time =
1925  uhs.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE);
1926  uhs.purpose.size = htonl (sizeof(uhs));
1927  uhs.sender = my_identity;
1928  uhs.receiver = receiver->target;
1929  GNUNET_CRYPTO_ecdhe_key_get_public (&epriv, &uhs.ephemeral);
1930  uhs.monotonic_time = uc.monotonic_time;
1932  &uhs.purpose,
1933  &uc.sender_sig));
1934  /* Leave space for kx */
1935  dpos = sizeof(kx);
1936  /* Append encrypted uc to dgram */
1937  GNUNET_assert (0 == gcry_cipher_encrypt (out_cipher,
1938  &dgram[dpos],
1939  sizeof(uc),
1940  &uc,
1941  sizeof(uc)));
1942  dpos += sizeof(uc);
1943  /* Append encrypted payload to dgram */
1944  GNUNET_assert (
1945  0 == gcry_cipher_encrypt (out_cipher, &dgram[dpos], msize, msg, msize));
1946  dpos += msize;
1947  do_pad (out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
1948  /* Datagram starts with kx */
1949  kx.ephemeral = uhs.ephemeral;
1950  GNUNET_assert (
1951  0 == gcry_cipher_gettag (out_cipher, kx.gcm_tag, sizeof(kx.gcm_tag)));
1952  gcry_cipher_close (out_cipher);
1953  memcpy (dgram, &kx, sizeof(kx));
1955  dgram,
1956  sizeof(dgram),
1957  receiver->address,
1958  receiver->address_len))
1961  "Sending KX to %s\n", GNUNET_a2s (receiver->address,
1962  receiver->address_len));
1964  return;
1965  } /* End of KX encryption method */
1966 
1967  /* begin "BOX" encryption method, scan for ACKs from tail! */
1968  for (struct SharedSecret *ss = receiver->ss_tail; NULL != ss; ss = ss->prev)
1969  {
1971  "In non-kx mode...\n");
1972  if (ss->sequence_used < ss->sequence_allowed)
1973  {
1974  char dgram[sizeof(struct UDPBox) + receiver->mtu];
1975  struct UDPBox *box;
1976  gcry_cipher_hd_t out_cipher;
1977  size_t dpos;
1978 
1979  box = (struct UDPBox *) dgram;
1980  ss->sequence_used++;
1981  get_kid (&ss->master, ss->sequence_used, &box->kid);
1982  setup_cipher (&ss->master, ss->sequence_used, &out_cipher);
1983  /* Append encrypted payload to dgram */
1984  dpos = sizeof(struct UDPBox);
1985  GNUNET_assert (
1986  0 == gcry_cipher_encrypt (out_cipher, &dgram[dpos], msize, msg, msize));
1987  dpos += msize;
1988  do_pad (out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
1989  GNUNET_assert (0 == gcry_cipher_gettag (out_cipher,
1990  box->gcm_tag,
1991  sizeof(box->gcm_tag)));
1992  gcry_cipher_close (out_cipher);
1994  dgram,
1995  sizeof(dgram),
1996  receiver->address,
1997  receiver->address_len))
2000  "Sending data\n");
2001 
2003  receiver->acks_available--;
2004  if (0 == receiver->acks_available)
2005  {
2006  /* We have no more ACKs => MTU change! */
2007  setup_receiver_mq (receiver);
2009  "No more acks, MTU changed\n");
2010  }
2011  return;
2012  }
2013  }
2014  GNUNET_assert (0);
2015 }
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:521
size_t mtu
MTU we allowed transport for this receiver right now.
static struct GNUNET_PeerIdentity my_identity
Our public key.
char gcm_tag[(128/8)]
128-bit authentication tag for the following encrypted message, from GCM.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
uint32_t sequence_allowed
Up to which sequence number did the other peer allow us to use this key, or up to which number did we...
struct sockaddr * address
Address of the other peer.
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:745
static struct GNUNET_FS_UnindexContext * uc
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
Encrypted continuation of UDP initial handshake, followed by message header with payload.
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE
Signature used by UDP communicator handshake.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
"Plaintext" header at beginning of KX message.
static void setup_cipher(const struct GNUNET_HashCode *msec, uint32_t serial, gcry_cipher_hd_t *cipher)
Setup cipher based on shared secret msec and serial number serial.
struct GNUNET_ShortHashCode kid
Key and IV identification code.
#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...
uint32_t sequence_used
Up to which sequence number did we use this master already? (for encrypting only) ...
struct GNUNET_HashCode master
Master shared secret.
struct SharedSecret * ss_tail
Shared secrets we received with target, last used is tail.
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:850
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_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
UDP message box.
static void setup_receiver_mq(struct ReceiverAddress *receiver)
Setup the MQ for the receiver.
Information we track per receiving address we have recently been in contact with (encryption to recei...
Private ECC key encoded for transmission.
Shared secret we generated for a particular sender or receiver.
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:206
static void get_kid(const struct GNUNET_HashCode *msec, uint32_t serial, struct GNUNET_ShortHashCode *kid)
Compute kid.
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static void do_pad(gcry_cipher_hd_t out_cipher, char *dgram, size_t pad_size)
Pad dgram by pad_size using out_cipher.
struct SharedSecret * prev
Kept in a DLL.
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:807
unsigned int acks_available
Number of BOX keys from ACKs we have currently available for this receiver.
static void reschedule_receiver_timeout(struct ReceiverAddress *receiver)
Increment receiver timeout due to activity.
socklen_t address_len
Length of the address.
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
#define GNUNET_log(kind,...)
Signature we use to verify that the ephemeral key was really chosen by the specified sender...
static struct SharedSecret * setup_shared_secret_enc(const struct GNUNET_CRYPTO_EcdhePrivateKey *ephemeral, struct ReceiverAddress *receiver)
Setup shared secret for encryption.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:657
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:486
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
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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 ReceiverAddress

Definition at line 2027 of file gnunet-communicator-udp.c.

References ReceiverAddress::mq, and receiver_destroy().

Referenced by setup_receiver_mq().

2028 {
2029  struct ReceiverAddress *receiver = impl_state;
2030 
2031  if (mq == receiver->mq)
2032  {
2033  receiver->mq = NULL;
2034  receiver_destroy (receiver);
2035  }
2036 }
Information we track per receiving address we have recently been in contact with (encryption to recei...
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
struct GNUNET_MQ_Handle * mq
Message queue we are providing for the ch.
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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 RecvierAddress

Definition at line 2046 of file gnunet-communicator-udp.c.

References GNUNET_assert.

Referenced by setup_receiver_mq().

2047 {
2048  /* Cancellation is impossible with UDP; bail */
2049  GNUNET_assert (0);
2050 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
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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 ReceiverAddress
errorerror code

Definition at line 2063 of file gnunet-communicator-udp.c.

References GNUNET_ERROR_TYPE_ERROR, GNUNET_i2s(), GNUNET_log, receiver_destroy(), and ReceiverAddress::target.

Referenced by setup_receiver_mq().

2064 {
2065  struct ReceiverAddress *receiver = cls;
2066 
2068  "MQ error in queue to %s: %d\n",
2069  GNUNET_i2s (&receiver->target),
2070  (int) error);
2071  receiver_destroy (receiver);
2072 }
Information we track per receiving address we have recently been in contact with (encryption to recei...
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
#define GNUNET_log(kind,...)
struct GNUNET_PeerIdentity target
To whom are we talking to.
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
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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 2162 of file gnunet-communicator-udp.c.

References GNUNET_TIME_Absolute::abs_value_us, ReceiverAddress::address, ReceiverAddress::address_len, check_timeouts(), COMMUNICATOR_ADDRESS_PREFIX, ReceiverAddress::foreign_addr, GNUNET_break_op, GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT, GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_CONTAINER_multipeermap_put(), GNUNET_CONTAINER_multipeermap_size(), GNUNET_new, GNUNET_NO, GNUNET_NT_scanner_get_type(), GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_STATISTICS_set(), GNUNET_SYSERR, GNUNET_TIME_relative_to_absolute(), ReceiverAddress::hn, ReceiverAddress::nt, peer, UdpHandshakeSignature::receiver, setup_receiver_mq(), sockaddr_to_udpaddr_string(), ReceiverAddress::target, ReceiverAddress::timeout, and udp_address_to_sockaddr().

Referenced by run().

2163 {
2164  struct ReceiverAddress *receiver;
2165  const char *path;
2166  struct sockaddr *in;
2167  socklen_t in_len;
2168 
2169  if (0 != strncmp (address,
2171  strlen (COMMUNICATOR_ADDRESS_PREFIX "-")))
2172  {
2173  GNUNET_break_op (0);
2174  return GNUNET_SYSERR;
2175  }
2176  path = &address[strlen (COMMUNICATOR_ADDRESS_PREFIX "-")];
2177  in = udp_address_to_sockaddr (path, &in_len);
2178 
2179  receiver = GNUNET_new (struct ReceiverAddress);
2180  receiver->address = in;
2181  receiver->address_len = in_len;
2182  receiver->target = *peer;
2183  receiver->nt = GNUNET_NT_scanner_get_type (is, in, in_len);
2185  receivers,
2186  &receiver->target,
2187  receiver,
2189  receiver->timeout =
2192  receiver,
2193  receiver->timeout.abs_value_us);
2195  "# receivers active",
2197  GNUNET_NO);
2198  receiver->foreign_addr =
2199  sockaddr_to_udpaddr_string (receiver->address, receiver->address_len);
2200  setup_receiver_mq (receiver);
2201  if (NULL == timeout_task)
2203  return GNUNET_OK;
2204 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
struct GNUNET_CONTAINER_HeapNode * GNUNET_CONTAINER_heap_insert(struct GNUNET_CONTAINER_Heap *heap, void *element, GNUNET_CONTAINER_HeapCostType cost)
Inserts a new element into the heap.
struct GNUNET_CONTAINER_HeapNode * hn
Entry in sender expiration heap.
static struct sockaddr * udp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert UDP bind specification to a struct sockaddr *
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
struct sockaddr * address
Address of the other peer.
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static char * sockaddr_to_udpaddr_string(const struct sockaddr *address, socklen_t address_len)
Converts address to the address string format used by this communicator in HELLOs.
uint64_t abs_value_us
The actual value.
char * foreign_addr
Address of the receiver in the human-readable format with the COMMUNICATOR_ADDRESS_PREFIX.
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
enum GNUNET_NetworkType nt
Which network type does this queue use?
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:1280
static void check_timeouts(void *cls)
Task run to check #receiver_heap and #sender_heap for timeouts.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
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 setup_receiver_mq(struct ReceiverAddress *receiver)
Setup the MQ for the receiver.
Information we track per receiving address we have recently been in contact with (encryption to recei...
struct GNUNET_TESTBED_Peer * peer
The peer associated with this model.
#define GNUNET_SYSERR
Definition: gnunet_common.h:84
static struct GNUNET_CONTAINER_Heap * receivers_heap
Expiration heap for receivers (contains struct ReceiverAddress)
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.
socklen_t address_len
Length of the address.
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
unsigned int GNUNET_CONTAINER_multipeermap_size(const struct GNUNET_CONTAINER_MultiPeerMap *map)
Get the number of key-value pairs in the map.
struct GNUNET_PeerIdentity target
To whom are we talking to.
struct GNUNET_TIME_Absolute timeout
Timeout for this receiver address.
static char * address
GNS address for this phone.
static struct GNUNET_SCHEDULER_Task * timeout_task
ID of timeout task.
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◆ get_receiver_delete_it()

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

Iterator over all receivers to clean up.

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

Definition at line 2216 of file gnunet-communicator-udp.c.

References GNUNET_OK, receiver_destroy(), and value.

Referenced by do_shutdown().

2219 {
2220  struct ReceiverAddress *receiver = value;
2221 
2222  (void) cls;
2223  (void) target;
2224  receiver_destroy (receiver);
2225  return GNUNET_OK;
2226 }
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
static char * value
Value of the record to add/remove.
Information we track per receiving address we have recently been in contact with (encryption to recei...
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
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◆ get_sender_delete_it()

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

Iterator over all senders to clean up.

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

Definition at line 2238 of file gnunet-communicator-udp.c.

References GNUNET_OK, UdpHandshakeSignature::sender, sender_destroy(), and value.

Referenced by do_shutdown().

2241 {
2242  struct SenderAddress *sender = value;
2243 
2244  (void) cls;
2245  (void) target;
2246  sender_destroy (sender);
2247  return GNUNET_OK;
2248 }
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
static char * value
Value of the record to add/remove.
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
static void sender_destroy(struct SenderAddress *sender)
Functions with this signature are called whenever we need to close a sender&#39;s state due to timeout...
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◆ do_shutdown()

static void do_shutdown ( void *  cls)
static

Shutdown the UNIX communicator.

Parameters
clsNULL (always)

Definition at line 2257 of file gnunet-communicator-udp.c.

References bi_destroy(), get_receiver_delete_it(), get_sender_delete_it(), GNUNET_break, GNUNET_CONTAINER_heap_destroy(), GNUNET_CONTAINER_multipeermap_destroy(), GNUNET_CONTAINER_multipeermap_iterate(), GNUNET_CONTAINER_multishortmap_destroy(), GNUNET_free, GNUNET_NAT_unregister(), GNUNET_NETWORK_socket_close(), GNUNET_NO, GNUNET_NT_scanner_done(), GNUNET_OK, GNUNET_SCHEDULER_cancel(), GNUNET_STATISTICS_destroy(), GNUNET_TRANSPORT_application_done(), and GNUNET_TRANSPORT_communicator_disconnect().

Referenced by run().

2258 {
2259  if (NULL != nat)
2260  {
2262  nat = NULL;
2263  }
2264  while (NULL != bi_head)
2265  bi_destroy (bi_head);
2266  if (NULL != broadcast_task)
2267  {
2269  broadcast_task = NULL;
2270  }
2271  if (NULL != read_task)
2272  {
2274  read_task = NULL;
2275  }
2276  if (NULL != udp_sock)
2277  {
2279  udp_sock = NULL;
2280  }
2283  NULL);
2290  if (NULL != ch)
2291  {
2293  ch = NULL;
2294  }
2295  if (NULL != ah)
2296  {
2298  ah = NULL;
2299  }
2300  if (NULL != stats)
2301  {
2303  stats = NULL;
2304  }
2305  if (NULL != my_private_key)
2306  {
2308  my_private_key = NULL;
2309  }
2310  if (NULL != is)
2311  {
2313  is = NULL;
2314  }
2315 }
static struct GNUNET_TRANSPORT_ApplicationHandle * ah
Our handle to report addresses for validation to TRANSPORT.
static struct GNUNET_NAT_Handle * nat
Connection to NAT service.
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
static struct BroadcastInterface * bi_head
Broadcast interface tasks.
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_NO
Definition: gnunet_common.h:86
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
void GNUNET_STATISTICS_destroy(struct GNUNET_STATISTICS_Handle *h, int sync_first)
Destroy a handle (free all state associated with it).
void GNUNET_TRANSPORT_application_done(struct GNUNET_TRANSPORT_ApplicationHandle *ch)
Shutdown TRANSPORT application client.
static void bi_destroy(struct BroadcastInterface *bi)
An interface went away, stop broadcasting on 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 * receivers
Receivers (map from peer identity to struct ReceiverAddress)
static struct GNUNET_SCHEDULER_Task * broadcast_task
ID of master broadcast task.
static int get_sender_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all senders to clean up.
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
void GNUNET_CONTAINER_heap_destroy(struct GNUNET_CONTAINER_Heap *heap)
Destroys the heap.
void GNUNET_NT_scanner_done(struct GNUNET_NT_InterfaceScanner *is)
Terminate interface scanner.
Definition: nt.c:433
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:692
static int get_receiver_delete_it(void *cls, const struct GNUNET_PeerIdentity *target, void *value)
Iterator over all receivers to clean up.
static struct GNUNET_CONTAINER_Heap * senders_heap
Expiration heap for senders (contains struct SenderAddress)
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static struct GNUNET_CONTAINER_MultiPeerMap * senders
Senders (map from peer identity to struct SenderAddress)
void GNUNET_CONTAINER_multishortmap_destroy(struct GNUNET_CONTAINER_MultiShortmap *map)
Destroy a hash map.
static struct GNUNET_CONTAINER_Heap * receivers_heap
Expiration heap for receivers (contains struct ReceiverAddress)
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 struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static struct GNUNET_SCHEDULER_Task * read_task
ID of read task.
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
int GNUNET_NETWORK_socket_close(struct GNUNET_NETWORK_Handle *desc)
Close a socket.
Definition: network.c:560
#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:966
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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 a backchannel message for this communicator (!) via a different return path.

Should be an acknowledgement.

Parameters
clsclosure, NULL
senderwhich peer sent the notification
msgpayload

Definition at line 2328 of file gnunet-communicator-udp.c.

References GNUNET_break_op, GNUNET_CONTAINER_multipeermap_get_multiple(), GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK, handle_ack(), GNUNET_MessageHeader::size, and GNUNET_MessageHeader::type.

Referenced by run().

2331 {
2332  const struct UDPAck *ack;
2333 
2334  (void) cls;
2335  if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK) ||
2336  (ntohs (msg->size) != sizeof(struct UDPAck)))
2337  {
2338  GNUNET_break_op (0);
2339  return;
2340  }
2341  ack = (const struct UDPAck *) msg;
2343  sender,
2344  &handle_ack,
2345  (void *) ack);
2346 }
#define GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK
UDP KX acknowledgement.
static int handle_ack(void *cls, const struct GNUNET_PeerIdentity *pid, void *value)
We received an ACK for pid.
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
static struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
UDP key acknowledgement.
int GNUNET_CONTAINER_multipeermap_get_multiple(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, GNUNET_CONTAINER_PeerMapIterator it, void *it_cls)
Iterate over all entries in the map that match a particular key.
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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 2363 of file gnunet-communicator-udp.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().

2369 {
2370  char *my_addr;
2372 
2373  if (GNUNET_YES == add_remove)
2374  {
2375  enum GNUNET_NetworkType nt;
2376 
2377  GNUNET_asprintf (&my_addr,
2378  "%s-%s",
2380  GNUNET_a2s (addr, addrlen));
2381  nt = GNUNET_NT_scanner_get_type (is, addr, addrlen);
2382  ai =
2384  my_addr,
2385  nt,
2387  GNUNET_free (my_addr);
2388  *app_ctx = ai;
2389  }
2390  else
2391  {
2392  ai = *app_ctx;
2394  *app_ctx = NULL;
2395  }
2396 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
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:85
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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◆ ifc_broadcast()

static void ifc_broadcast ( void *  cls)
static

Broadcast our presence on one of our interfaces.

Parameters
clsa struct BroadcastInterface

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

References BroadcastInterface::ba, BroadcastInterface::bcm, BROADCAST_FREQUENCY, BroadcastInterface::broadcast_task, GNUNET_break, GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u64(), GNUNET_ERROR_TYPE_WARNING, GNUNET_log_strerror, GNUNET_NETWORK_socket_sendto(), GNUNET_NETWORK_socket_setsockopt(), GNUNET_OK, GNUNET_SCHEDULER_add_delayed(), INTERFACE_SCAN_FREQUENCY, BroadcastInterface::mcreq, my_port, BroadcastInterface::sa, and BroadcastInterface::salen.

Referenced by iface_proc().

2406 {
2407  struct BroadcastInterface *bi = cls;
2408  struct GNUNET_TIME_Relative delay;
2409 
2411  delay.rel_value_us =
2413  bi->broadcast_task =
2415 
2416  switch (bi->sa->sa_family)
2417  {
2418  case AF_INET: {
2419  static int yes = 1;
2420  static int no = 0;
2421  ssize_t sent;
2422 
2424  SOL_SOCKET,
2425  SO_BROADCAST,
2426  &yes,
2427  sizeof(int)))
2430  &bi->bcm,
2431  sizeof(bi->bcm),
2432  bi->ba,
2433  bi->salen);
2434  if (-1 == sent)
2437  SOL_SOCKET,
2438  SO_BROADCAST,
2439  &no,
2440  sizeof(int)))
2442  break;
2443  }
2444 
2445  case AF_INET6: {
2446  ssize_t sent;
2447  struct sockaddr_in6 dst;
2448 
2449  dst.sin6_family = AF_INET6;
2450  dst.sin6_port = htons (my_port);
2451  dst.sin6_addr = bi->mcreq.ipv6mr_multiaddr;
2452  dst.sin6_scope_id = ((struct sockaddr_in6 *) bi->ba)->sin6_scope_id;
2453 
2455  &bi->bcm,
2456  sizeof(bi->bcm),
2457  (const struct sockaddr *) &dst,
2458  sizeof(dst));
2459  if (-1 == sent)
2461  break;
2462  }
2463 
2464  default:
2465  GNUNET_break (0);
2466  break;
2467  }
2468 }
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:883
#define BROADCAST_FREQUENCY
How often do we broadcast our presence on the LAN?
static uint16_t my_port
Port number to which we are actually bound.
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Random on unsigned 64-bit values.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur...
struct sockaddr * ba
Broadcast address to use on the interface.
static void ifc_broadcast(void *cls)
Broadcast our presence on one of our interfaces.
#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...
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
ssize_t GNUNET_NETWORK_socket_sendto(const struct GNUNET_NETWORK_Handle *desc, const void *message, size_t length, const struct sockaddr *dest_addr, socklen_t dest_len)
Send data to a particular destination (always non-blocking).
Definition: network.c:850
struct sockaddr * sa
Sender&#39;s address of the interface.
socklen_t salen
Number of bytes in sa.
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static struct GNUNET_TIME_Relative delay
When should dkg communication start?
struct UDPBroadcast bcm
Message we broadcast on this interface.
struct ipv6_mreq mcreq
If this is an IPv6 interface, this is the request we use to join/leave the group. ...
#define INTERFACE_SCAN_FREQUENCY
How often do we scan for changes to our network interfaces?
struct GNUNET_SCHEDULER_Task * broadcast_task
Task for this broadcast interface.
Interface we broadcast our presence on.
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
Time for relative time used by GNUnet, in microseconds.
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◆ iface_proc()

static int iface_proc ( void *  cls,
const char *  name,
int  isDefault,
const struct sockaddr *  addr,
const struct sockaddr *  broadcast_addr,
const struct sockaddr *  netmask,
socklen_t  addrlen 
)
static

Callback function invoked for each interface found.

Activates/deactivates broadcast interfaces.

Parameters
clsNULL
namename of the interface (can be NULL for unknown)
isDefaultis this presumably the default interface
addraddress of this interface (can be NULL for unknown or unassigned)
broadcast_addrthe broadcast address (can be NULL for unknown or unassigned)
netmaskthe network mask (can be NULL for unknown or unassigned)
addrlenlength of the address
Returns
GNUNET_OK to continue iteration, GNUNET_SYSERR to abort

Definition at line 2486 of file gnunet-communicator-udp.c.

References BroadcastInterface::ba, BroadcastInterface::bcm, BroadcastInterface::broadcast_task, BroadcastInterface::found, GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_CRYPTO_eddsa_sign(), GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_WARNING, GNUNET_log_strerror, GNUNET_memdup, GNUNET_NETWORK_socket_setsockopt(), GNUNET_new, GNUNET_NT_LOOPBACK, GNUNET_NT_scanner_get_type(), GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST, GNUNET_YES, UdpBroadcastSignature::h_address, have_v6_socket, ifc_broadcast(), BroadcastInterface::mcreq, my_identity, BroadcastInterface::next, GNUNET_CRYPTO_EccSignaturePurpose::purpose, UdpBroadcastSignature::purpose, BroadcastInterface::sa, BroadcastInterface::salen, UDPBroadcast::sender, UdpBroadcastSignature::sender, UDPBroadcast::sender_sig, and GNUNET_CRYPTO_EccSignaturePurpose::size.

Referenced by do_broadcast().

2493 {
2494  struct BroadcastInterface *bi;
2495  enum GNUNET_NetworkType network;
2496  struct UdpBroadcastSignature ubs;
2497 
2498  (void) cls;
2499  (void) netmask;
2500  if (NULL == addr)
2501  return GNUNET_YES; /* need to know our address! */
2502  network = GNUNET_NT_scanner_get_type (is, addr, addrlen);
2503  if (GNUNET_NT_LOOPBACK == network)
2504  {
2505  /* Broadcasting on loopback does not make sense */
2506  return GNUNET_YES;
2507  }
2508  for (bi = bi_head; NULL != bi; bi = bi->next)
2509  {
2510  if ((bi->salen == addrlen) && (0 == memcmp (addr, bi->sa, addrlen)))
2511  {
2512  bi->found = GNUNET_YES;
2513  return GNUNET_OK;
2514  }
2515  }
2516 
2517  if ((AF_INET6 == addr->sa_family) && (NULL == broadcast_addr))
2518  return GNUNET_OK; /* broadcast_addr is required for IPv6! */
2519  if ((AF_INET6 == addr->sa_family) && (GNUNET_YES != have_v6_socket))
2520  return GNUNET_OK; /* not using IPv6 */
2521 
2522  bi = GNUNET_new (struct BroadcastInterface);
2523  bi->sa = GNUNET_memdup (addr, addrlen);
2524  if (NULL != broadcast_addr)
2525  bi->ba = GNUNET_memdup (broadcast_addr, addrlen);
2526  bi->salen = addrlen;
2527  bi->found = GNUNET_YES;
2528  bi->bcm.sender = my_identity;
2529  ubs.purpose.purpose = htonl (GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST);
2530  ubs.purpose.size = htonl (sizeof(ubs));
2531  ubs.sender = my_identity;
2532  GNUNET_CRYPTO_hash (addr, addrlen, &ubs.h_address);
2534  &ubs.purpose,
2535  &bi->bcm.sender_sig));
2536  if (NULL != broadcast_addr)
2537  {
2540  }
2541  if ((AF_INET6 == addr->sa_family) && (NULL != broadcast_addr))
2542  {
2543  /* Create IPv6 multicast request */
2544  const struct sockaddr_in6 *s6 =
2545  (const struct sockaddr_in6 *) broadcast_addr;
2546 
2547  GNUNET_assert (
2548  1 == inet_pton (AF_INET6, "FF05::13B", &bi->mcreq.ipv6mr_multiaddr));
2549 
2550  /* http://tools.ietf.org/html/rfc2553#section-5.2:
2551  *
2552  * IPV6_JOIN_GROUP
2553  *
2554  * Join a multicast group on a specified local interface. If the
2555  * interface index is specified as 0, the kernel chooses the local
2556  * interface. For example, some kernels look up the multicast
2557  * group in the normal IPv6 routing table and using the resulting
2558  * interface; we do this for each interface, so no need to use
2559  * zero (anymore...).
2560  */bi->mcreq.ipv6mr_interface = s6->sin6_scope_id;
2561 
2562  /* Join the multicast group */
2564  IPPROTO_IPV6,
2565  IPV6_JOIN_GROUP,
2566  &bi->mcreq,
2567  sizeof(bi->mcreq)))
2568  {
2570  }
2571  }
2572  return GNUNET_OK;
2573 }
int GNUNET_NETWORK_socket_setsockopt(struct GNUNET_NETWORK_Handle *fd, int level, int option_name, const void *option_value, socklen_t option_len)
Set socket option.
Definition: network.c:883
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:314
static struct BroadcastInterface * bi_tail
Broadcast interface tasks.
int found
Was this interface found in the last iface_proc() scan?
struct GNUNET_PeerIdentity sender
Sender&#39;s peer identity.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
static struct GNUNET_PeerIdentity my_identity
Our public key.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static struct BroadcastInterface * bi_head
Broadcast interface tasks.
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:745
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static int have_v6_socket
GNUNET_YES if udp_sock supports IPv6.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
struct sockaddr * ba
Broadcast address to use on the interface.
static void ifc_broadcast(void *cls)
Broadcast our presence on one of our interfaces.
#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...
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:48
#define GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST
Signature used by UDP broadcasts.
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:1280
static struct GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
struct sockaddr * sa
Sender&#39;s address of the interface.
socklen_t salen
Number of bytes in sa.
struct GNUNET_CRYPTO_EddsaSignature sender_sig
Sender&#39;s signature of type GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST.
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
Loopback (same host).
Definition: gnunet_nt_lib.h:45
struct UDPBroadcast bcm
Message we broadcast on this interface.
struct ipv6_mreq mcreq
If this is an IPv6 interface, this is the request we use to join/leave the group. ...
Signature we use to verify that the broadcast was really made by the peer that claims to have made it...
struct GNUNET_SCHEDULER_Task * broadcast_task
Task for this broadcast interface.
#define GNUNET_YES
Definition: gnunet_common.h:85
Interface we broadcast our presence on.
struct BroadcastInterface * next
Kept in a DLL.
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◆ do_broadcast()

static void do_broadcast ( void *  cls)
static

Scan interfaces to broadcast our presence on the LAN.

Parameters
clsNULL, unused

Definition at line 2582 of file gnunet-communicator-udp.c.

References bi_destroy(), BroadcastInterface::found, GNUNET_NO, GNUNET_OS_network_interfaces_list(), GNUNET_SCHEDULER_add_delayed(), iface_proc(), INTERFACE_SCAN_FREQUENCY, and BroadcastInterface::next.

Referenced by run().

2583 {
2584  struct BroadcastInterface *bin;
2585 
2586  (void) cls;
2587  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bi->next)
2588  bi->found = GNUNET_NO;
2590  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bin)
2591  {
2592  bin = bi->next;
2593  if (GNUNET_NO == bi->found)
2594  bi_destroy (bi);
2595  }
2597  &do_broadcast,
2598  NULL);
2599 }
int found
Was this interface found in the last iface_proc() scan?
static void do_broadcast(void *cls)
Scan interfaces to broadcast our presence on the LAN.
static struct BroadcastInterface * bi_head
Broadcast interface tasks.
#define GNUNET_NO
Definition: gnunet_common.h:86
void GNUNET_OS_network_interfaces_list(GNUNET_OS_NetworkInterfaceProcessor proc, void *proc_cls)
Enumerate all network interfaces.
Definition: os_network.c:396
static int iface_proc(void *cls, const char *name, int isDefault, const struct sockaddr *addr, const struct sockaddr *broadcast_addr, const struct sockaddr *netmask, socklen_t addrlen)
Callback function invoked for each interface found.
static void bi_destroy(struct BroadcastInterface *bi)
An interface went away, stop broadcasting on it.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_delayed(struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay.
Definition: scheduler.c:1253
static struct GNUNET_SCHEDULER_Task * broadcast_task
ID of master broadcast task.
#define INTERFACE_SCAN_FREQUENCY
How often do we scan for changes to our network interfaces?
Interface we broadcast our presence on.
struct BroadcastInterface * next
Kept in a DLL.
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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 2611 of file gnunet-communicator-udp.c.

References _, COMMUNICATOR_ADDRESS_PREFIX, COMMUNICATOR_CONFIG_SECTION, do_broadcast(), do_shutdown(), enc_notify_cb(), GNUNET_a2s(), GNUNET_break, GNUNET_CONFIGURATION_get_value_string(), GNUNET_CONFIGURATION_get_value_yesno(), GNUNET_CONTAINER_heap_create(), GNUNET_CONTAINER_HEAP_ORDER_MIN, GNUNET_CONTAINER_multipeermap_create(), GNUNET_CONTAINER_multishortmap_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_NT_scanner_init(), GNUNET_OK, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_read_net(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_shutdown(), GNUNET_STATISTICS_create(), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_TRANSPORT_application_init(), GNUNET_TRANSPORT_CC_UNRELIABLE, GNUNET_TRANSPORT_communicator_connect(), GNUNET_YES, have_v6_socket, mq_init(), my_identity, my_port, nat_address_cb(), GNUNET_PeerIdentity::public_key, sock_read(), and udp_address_to_sockaddr().

Referenced by main().

2615 {
2616  char *bindto;
2617  struct sockaddr *in;
2618  socklen_t in_len;
2619  struct sockaddr_storage in_sto;
2620  socklen_t sto_len;
2621 
2622  (void) cls;
2623  cfg = c;
2624  if (GNUNET_OK !=
2627  "BINDTO",
2628  &bindto))
2629  {
2632  "BINDTO");
2633  return;
2634  }
2635 
2636  in = udp_address_to_sockaddr (bindto, &in_len);
2637  if (NULL == in)
2638  {
2640  "Failed to setup UDP socket address with path `%s'\n",
2641  bindto);
2642  GNUNET_free (bindto);
2643  return;
2644  }
2645  udp_sock =
2646  GNUNET_NETWORK_socket_create (in->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2647  if (NULL == udp_sock)
2648  {
2650  GNUNET_free (in);
2651  GNUNET_free (bindto);
2652  return;
2653  }
2654  if (AF_INET6 == in->sa_family)
2656  if (GNUNET_OK != GNUNET_NETWORK_socket_bind (udp_sock, in, in_len))
2657  {
2660  udp_sock = NULL;
2661  GNUNET_free (in);
2662  GNUNET_free (bindto);
2663  return;
2664  }
2665 
2666  /* We might have bound to port 0, allowing the OS to figure it out;
2667  thus, get the real IN-address from the socket */
2668  sto_len = sizeof(in_sto);
2669  if (0 != getsockname (GNUNET_NETWORK_get_fd (udp_sock),
2670  (struct sockaddr *) &in_sto,
2671  &sto_len))
2672  {
2673  memcpy (&in_sto, in, in_len);
2674  sto_len = in_len;
2675  }
2676  GNUNET_free (in);
2677  GNUNET_free (bindto);
2678  in = (struct sockaddr *) &in_sto;
2679  in_len = sto_len;
2681  "Bound to `%s'\n",
2682  GNUNET_a2s ((const struct sockaddr *) &in_sto, sto_len));
2683  switch (in->sa_family)
2684  {
2685  case AF_INET:
2686  my_port = ntohs (((struct sockaddr_in *) in)->sin_port);
2687  break;
2688 
2689  case AF_INET6:
2690  my_port = ntohs (((struct sockaddr_in6 *) in)->sin6_port);
2691  break;
2692 
2693  default:
2694  GNUNET_break (0);
2695  my_port = 0;
2696  }
2697  stats = GNUNET_STATISTICS_create ("C-UDP", cfg);
2701  receivers_heap =
2707  if (NULL == my_private_key)
2708  {
2709  GNUNET_log (
2711  _ (
2712  "Transport service is lacking key configuration settings. Exiting.\n"));
2714  return;
2715  }
2717  /* start reading */
2719  udp_sock,
2720  &sock_read,
2721  NULL);
2726  &mq_init,
2727  NULL,
2728  &enc_notify_cb,
2729  NULL);
2730  if (NULL == ch)
2731  {
2732  GNUNET_break (0);
2734  return;
2735  }
2737  if (NULL == ah)
2738  {
2739  GNUNET_break (0);
2741  return;
2742  }
2743  /* start broadcasting */
2744  if (GNUNET_YES !=
2747  "DISABLE_BROADCAST"))
2748  {
2750  }
2753  IPPROTO_UDP,
2754  1 /* one address */,
2755  (const struct sockaddr **) &in,
2756  &in_len,
2757  &nat_address_cb,
2758  NULL /* FIXME: support reversal: #5529 */,
2759  NULL /* closure */);
2760 }
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1080
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
static void do_broadcast(void *cls)
Scan interfaces to broadcast our presence on the LAN.
static struct GNUNET_TRANSPORT_ApplicationHandle * ah
Our handle to report addresses for validation to TRANSPORT.
static uint16_t my_port
Port number to which we are actually bound.
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:1300
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
static struct sockaddr * udp_address_to_sockaddr(const char *bindto, socklen_t *sock_len)
Convert UDP bind specification to a struct sockaddr *
static struct GNUNET_CONTAINER_MultiShortmap * key_cache
Cache of pre-generated key IDs.
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:485
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
static int have_v6_socket
GNUNET_YES if udp_sock supports IPv6.
void GNUNET_SCHEDULER_shutdown(void)
Request the shutdown of a scheduler.
Definition: scheduler.c:526
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).
#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:180
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 a backchannel message for this communicator (...
#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 struct GNUNET_CONTAINER_MultiPeerMap * receivers
Receivers (map from peer identity to struct ReceiverAddress)
static struct GNUNET_SCHEDULER_Task * broadcast_task
ID of master broadcast task.
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...
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:1280
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
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 GNUNET_CRYPTO_EddsaPrivateKey * my_private_key
Our private key.
struct GNUNET_CONTAINER_MultiShortmap * GNUNET_CONTAINER_multishortmap_create(unsigned int len, int do_not_copy_keys)
Create a multi peer map (hash map for public keys of peers).
Heap with the minimum cost at the root.
static void sock_read(void *cls)
Socket read task.
int GNUNET_CONFIGURATION_get_value_string(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be a string.
static int mq_init(void *cls, const struct GNUNET_PeerIdentity *peer, const char *address)
Function called by the transport service to initialize a message queue given address information abou...
static struct GNUNET_CONTAINER_Heap * senders_heap
Expiration heap for senders (contains struct SenderAddress)
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:378
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:412
static struct GNUNET_NETWORK_Handle * udp_sock
Our socket.
static struct GNUNET_CONTAINER_MultiPeerMap * senders
Senders (map from peer identity to struct SenderAddress)
struct GNUNET_CONTAINER_Heap * GNUNET_CONTAINER_heap_create(enum GNUNET_CONTAINER_HeapOrder order)
Create a new heap.
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:189
static struct GNUNET_CONTAINER_Heap * receivers_heap
Expiration heap for receivers (contains struct ReceiverAddress)
struct GNUNET_TRANSPORT_ApplicationHandle * GNUNET_TRANSPORT_application_init(const struct GNUNET_CONFIGURATION_Handle *cfg)
Initialize the TRANSPORT application client handle.
#define GNUNET_log(kind,...)
static struct GNUNET_STATISTICS_Handle * stats
For logging statistics.
static struct GNUNET_SCHEDULER_Task * read_task
ID of read task.
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 ...
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...
#define GNUNET_YES
Definition: gnunet_common.h:85
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:1486
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
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 void do_shutdown(void *cls)
Shutdown the UNIX communicator.
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:560
#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:912
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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 2771 of file gnunet-communicator-udp.c.

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

2772 {
2773  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2775  };
2776  int ret;
2777 
2778  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
2779  return 2;
2780 
2781  ret = (GNUNET_OK == GNUNET_PROGRAM_run (argc,
2782  argv,
2783  "gnunet-communicator-udp",
2784  _ ("GNUnet UDP communicator"),
2785  options,
2786  &run,
2787  NULL))
2788  ? 0
2789  : 1;
2790  GNUNET_free ((void *) argv);
2791  return ret;
2792 }
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:1438
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:83
Definition of a command line option.
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
#define _(String)
GNU gettext support macro.
Definition: platform.h:180
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

◆ key_cache

struct GNUNET_CONTAINER_MultiShortmap* key_cache
static

Cache of pre-generated key IDs.

Definition at line 645 of file gnunet-communicator-udp.c.

◆ read_task

struct GNUNET_SCHEDULER_Task* read_task
static

ID of read task.

Definition at line 650 of file gnunet-communicator-udp.c.

◆ timeout_task

struct GNUNET_SCHEDULER_Task* timeout_task
static

ID of timeout task.

Definition at line 655 of file gnunet-communicator-udp.c.

◆ broadcast_task

struct GNUNET_SCHEDULER_Task* broadcast_task
static

ID of master broadcast task.

Definition at line 660 of file gnunet-communicator-udp.c.

◆ stats

struct GNUNET_STATISTICS_Handle* stats
static

For logging statistics.

Definition at line 665 of file gnunet-communicator-udp.c.

◆ ch

Our environment.

Definition at line 670 of file gnunet-communicator-udp.c.

◆ receivers

struct GNUNET_CONTAINER_MultiPeerMap* receivers
static

Receivers (map from peer identity to struct ReceiverAddress)

Definition at line 675 of file gnunet-communicator-udp.c.

◆ senders

struct GNUNET_CONTAINER_MultiPeerMap* senders
static

Senders (map from peer identity to struct SenderAddress)

Definition at line 680 of file gnunet-communicator-udp.c.

◆ senders_heap

struct GNUNET_CONTAINER_Heap* senders_heap
static

Expiration heap for senders (contains struct SenderAddress)

Definition at line 685 of file gnunet-communicator-udp.c.

◆ receivers_heap

struct GNUNET_CONTAINER_Heap* receivers_heap
static

Expiration heap for receivers (contains struct ReceiverAddress)

Definition at line 690 of file gnunet-communicator-udp.c.

◆ bi_head

struct BroadcastInterface* bi_head
static

Broadcast interface tasks.

Kept in a DLL.

Definition at line 695 of file gnunet-communicator-udp.c.

◆ bi_tail

struct BroadcastInterface* bi_tail
static

Broadcast interface tasks.

Kept in a DLL.

Definition at line 700 of file gnunet-communicator-udp.c.

◆ udp_sock

struct GNUNET_NETWORK_Handle* udp_sock
static

Our socket.

Definition at line 705 of file gnunet-communicator-udp.c.

◆ have_v6_socket

int have_v6_socket
static

GNUNET_YES if udp_sock supports IPv6.

Definition at line 710 of file gnunet-communicator-udp.c.

Referenced by iface_proc(), and run().

◆ my_identity

struct GNUNET_PeerIdentity my_identity
static

Our public key.

Definition at line 715 of file gnunet-communicator-udp.c.

Referenced by iface_proc(), mq_send(), run(), and verify_confirmation().

◆ my_private_key

struct GNUNET_CRYPTO_EddsaPrivateKey* my_private_key
static

Our private key.

Definition at line 720 of file gnunet-communicator-udp.c.

◆ cfg

const struct GNUNET_CONFIGURATION_Handle* cfg
static

Our configuration.

Definition at line 725 of file gnunet-communicator-udp.c.

◆ ah

Our handle to report addresses for validation to TRANSPORT.

Definition at line 730 of file gnunet-communicator-udp.c.

◆ is

struct GNUNET_NT_InterfaceScanner* is
static

Network scanner to determine network types.

Definition at line 735 of file gnunet-communicator-udp.c.

◆ nat

struct GNUNET_NAT_Handle* nat
static

Connection to NAT service.

Definition at line 740 of file gnunet-communicator-udp.c.

◆ my_port

uint16_t my_port
static

Port number to which we are actually bound.

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

Referenced by ifc_broadcast(), and run().