GNUnet  0.10.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 742 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().

743 {
744  if (AF_INET6 == bi->sa->sa_family)
745  {
746  /* Leave the multicast group */
748  IPPROTO_IPV6,
749  IPV6_LEAVE_GROUP,
750  &bi->mcreq,
751  sizeof(bi->mcreq)))
752  {
754  }
755  }
758  GNUNET_free(bi->sa);
760  GNUNET_free(bi);
761 }
#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:871
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:75
#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:956
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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 770 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().

771 {
772  struct GNUNET_MQ_Handle *mq;
773 
775  "Disconnecting receiver for peer `%s'\n",
776  GNUNET_i2s(&receiver->target));
777  if (NULL != (mq = receiver->mq))
778  {
779  receiver->mq = NULL;
780  GNUNET_MQ_destroy(mq);
781  }
782  if (NULL != receiver->qh)
783  {
785  receiver->qh = NULL;
786  }
789  &receiver->target,
790  receiver));
791  GNUNET_assert(receiver == GNUNET_CONTAINER_heap_remove_node(receiver->hn));
793  "# receivers active",
795  GNUNET_NO);
796  GNUNET_free(receiver->address);
797  GNUNET_free(receiver->foreign_addr);
798  GNUNET_free(receiver);
799 }
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:78
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:84
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:821
#define GNUNET_YES
Definition: gnunet_common.h:77
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 808 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().

809 {
810  struct SharedSecret *ss = kce->ss;
811 
812  ss->active_kce_count--;
815  &kce->kid,
816  kce));
817  GNUNET_free(kce);
818 }
#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:77
#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 829 of file gnunet-communicator-udp.c.

References GNUNET_CRYPTO_hkdf().

Referenced by kce_generate(), and mq_send().

832 {
833  uint32_t sid = htonl(serial);
834 
835  GNUNET_CRYPTO_hkdf(kid,
836  sizeof(*kid),
837  GCRY_MD_SHA512,
838  GCRY_MD_SHA256,
839  &sid,
840  sizeof(sid),
841  msec,
842  sizeof(*msec),
843  "UDP-KID",
844  strlen("UDP-KID"),
845  NULL,
846  0);
847 }
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:289
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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 857 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().

858 {
859  struct KeyCacheEntry *kce;
860 
861  GNUNET_assert(0 < seq);
862  kce = GNUNET_new(struct KeyCacheEntry);
863  kce->ss = ss;
864  kce->sequence_number = seq;
865  get_kid(&ss->master, seq, &kce->kid);
867  ss->active_kce_count++;
869  key_cache,
870  &kce->kid,
871  kce,
874  "# KIDs active",
876  GNUNET_NO);
877 }
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:78
#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 886 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().

887 {
888  struct SenderAddress *sender;
889  struct ReceiverAddress *receiver;
890  struct KeyCacheEntry *kce;
891 
892  if (NULL != (sender = ss->sender))
893  {
894  GNUNET_CONTAINER_DLL_remove(sender->ss_head, sender->ss_tail, ss);
895  sender->num_secrets--;
896  }
897  if (NULL != (receiver = ss->receiver))
898  {
899  GNUNET_CONTAINER_DLL_remove(receiver->ss_head, receiver->ss_tail, ss);
900  receiver->num_secrets--;
901  receiver->acks_available -= (ss->sequence_allowed - ss->sequence_used);
902  }
903  while (NULL != (kce = ss->kce_head))
904  kce_destroy(kce);
905  GNUNET_STATISTICS_update(stats, "# Secrets active", -1, GNUNET_NO);
907  "# KIDs active",
909  GNUNET_NO);
910  GNUNET_free(ss);
911 }
#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:78
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 921 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().

922 {
924  GNUNET_YES ==
928  "# senders active",
930  GNUNET_NO);
931  GNUNET_free(sender->address);
932  GNUNET_free(sender);
933 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
int GNUNET_CONTAINER_multipeermap_remove(struct GNUNET_CONTAINER_MultiPeerMap *map, const struct GNUNET_PeerIdentity *key, const void *value)
Remove the given key-value pair from the map.
#define GNUNET_NO
Definition: gnunet_common.h:78
struct GNUNET_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:77
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 945 of file gnunet-communicator-udp.c.

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

Referenced by setup_cipher().

949 {
950  uint32_t sid = htonl(serial);
951  char res[AES_KEY_SIZE + AES_IV_SIZE];
952 
953  GNUNET_CRYPTO_hkdf(res,
954  sizeof(res),
955  GCRY_MD_SHA512,
956  GCRY_MD_SHA256,
957  &sid,
958  sizeof(sid),
959  msec,
960  sizeof(*msec),
961  "UDP-IV-KEY",
962  strlen("UDP-IV-KEY"),
963  NULL,
964  0);
965  memcpy(key, res, AES_KEY_SIZE);
966  memcpy(iv, &res[AES_KEY_SIZE], AES_IV_SIZE);
967 }
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:289
#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 976 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().

977 {
978  sender->timeout =
981 }
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 990 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().

991 {
992  receiver->timeout =
995  receiver->timeout.abs_value_us);
996 }
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 1005 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().

1006 {
1007  struct GNUNET_TIME_Relative st;
1008  struct GNUNET_TIME_Relative rt;
1009  struct GNUNET_TIME_Relative delay;
1010  struct ReceiverAddress *receiver;
1011  struct SenderAddress *sender;
1012 
1013  (void)cls;
1014  timeout_task = NULL;
1016  while (NULL != (receiver = GNUNET_CONTAINER_heap_peek(receivers_heap)))
1017  {
1019  if (0 != rt.rel_value_us)
1020  break;
1021  receiver_destroy(receiver);
1022  }
1024  while (NULL != (sender = GNUNET_CONTAINER_heap_peek(senders_heap)))
1025  {
1027  if (0 != st.rel_value_us)
1028  break;
1029  sender_destroy(sender);
1030  }
1032  if (delay.rel_value_us < GNUNET_TIME_UNIT_FOREVER_REL.rel_value_us)
1034 }
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:1237
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 1043 of file gnunet-communicator-udp.c.

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

Referenced by setup_shared_secret_enc(), and sock_read().

1044 {
1045  GNUNET_CRYPTO_hkdf(&ss->cmac,
1046  sizeof(ss->cmac),
1047  GCRY_MD_SHA512,
1048  GCRY_MD_SHA256,
1049  "CMAC",
1050  strlen("CMAC"),
1051  &ss->master,
1052  sizeof(ss->master),
1053  "UDP-CMAC",
1054  strlen("UDP-CMAC"),
1055  NULL,
1056  0);
1057 }
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:289
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 1069 of file gnunet-communicator-udp.c.

References ADDRESS_VALIDITY_PERIOD, GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_TRANSPORT_communicator_receive(), GNUNET_MessageHeader::size, and SenderAddress::target.

Referenced by try_handle_plaintext().

1072 {
1073  const struct GNUNET_MessageHeader *hdr = plaintext;
1074 
1075  while (ntohs(hdr->size) < plaintext_len)
1076  {
1078  "# bytes given to core",
1079  ntohs(hdr->size),
1080  GNUNET_NO);
1081  (void)
1083  &sender->target,
1084  hdr,
1086  NULL /* no flow control possible */
1087  ,
1088  NULL);
1089  /* move on to next message, if any */
1090  plaintext_len -= ntohs(hdr->size);
1091  if (plaintext_len < sizeof(*hdr))
1092  break;
1093  hdr = plaintext + ntohs(hdr->size);
1094  }
1096  "# bytes padding discarded",
1097  plaintext_len,
1098  GNUNET_NO);
1099 }
#define GNUNET_NO
Definition: gnunet_common.h:78
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.
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).
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 1111 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().

1114 {
1115  char key[AES_KEY_SIZE];
1116  char iv[AES_IV_SIZE];
1117 
1118  gcry_cipher_open(cipher,
1119  GCRY_CIPHER_AES256 /* low level: go for speed */,
1120  GCRY_CIPHER_MODE_GCM,
1121  0 /* flags */);
1122  get_iv_key(msec, serial, key, iv);
1123  gcry_cipher_setkey(*cipher, key, sizeof(key));
1124  gcry_cipher_setiv(*cipher, iv, sizeof(iv));
1125 }
#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 1141 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().

1147 {
1148  gcry_cipher_hd_t cipher;
1149 
1150  setup_cipher(&ss->master, serial, &cipher);
1151  GNUNET_assert(
1152  0 ==
1153  gcry_cipher_decrypt(cipher, out_buf, in_buf_size, in_buf, in_buf_size));
1154  if (0 != gcry_cipher_checktag(cipher, tag, GCM_TAG_SIZE))
1155  {
1156  gcry_cipher_close(cipher);
1158  "# AEAD authentication failures",
1159  1,
1160  GNUNET_NO);
1161  return GNUNET_SYSERR;
1162  }
1163  gcry_cipher_close(cipher);
1164  return GNUNET_OK;
1165 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#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:76
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 1175 of file gnunet-communicator-udp.c.

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

Referenced by sock_read().

1176 {
1177  struct SharedSecret *ss;
1178 
1179  ss = GNUNET_new(struct SharedSecret);
1181  return ss;
1182 }
#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:1505
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 1193 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().

1195 {
1196  struct SharedSecret *ss;
1197 
1198  ss = GNUNET_new(struct SharedSecret);
1199  GNUNET_CRYPTO_ecdh_eddsa(ephemeral,
1200  &receiver->target.public_key,
1201  &ss->master);
1202  calculate_cmac(ss);
1203  ss->receiver = receiver;
1204  GNUNET_CONTAINER_DLL_insert(receiver->ss_head, receiver->ss_tail, ss);
1205  receiver->num_secrets++;
1206  GNUNET_STATISTICS_update(stats, "# Secrets active", 1, GNUNET_NO);
1207  return ss;
1208 }
#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:78
#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:1615
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 2041 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().

2042 {
2043  size_t base_mtu;
2044 
2045  if (NULL != receiver->qh)
2046  {
2048  receiver->qh = NULL;
2049  }
2050  GNUNET_assert(NULL == receiver->mq);
2051  switch (receiver->address->sa_family)
2052  {
2053  case AF_INET:
2054  base_mtu = 1480 /* Ethernet MTU, 1500 - Ethernet header - VLAN tag */
2055  - sizeof(struct GNUNET_TUN_IPv4Header) /* 20 */
2056  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2057  break;
2058 
2059  case AF_INET6:
2060  base_mtu = 1280 /* Minimum MTU required by IPv6 */
2061  - sizeof(struct GNUNET_TUN_IPv6Header) /* 40 */
2062  - sizeof(struct GNUNET_TUN_UdpHeader) /* 8 */;
2063  break;
2064 
2065  default:
2066  GNUNET_assert(0);
2067  break;
2068  }
2069  if (0 == receiver->acks_available)
2070  {
2071  /* MTU based on full KX messages */
2072  receiver->mtu = base_mtu - sizeof(struct InitialKX) /* 48 */
2073  - sizeof(struct UDPConfirmation); /* 104 */
2074  }
2075  else
2076  {
2077  /* MTU based on BOXed messages */
2078  receiver->mtu = base_mtu - sizeof(struct UDPBox);
2079  }
2080  /* => Effective MTU for CORE will range from 1080 (IPv6 + KX) to
2081  1404 (IPv4 + Box) bytes, depending on circumstances... */
2082  if (NULL == receiver->mq)
2084  &mq_destroy,
2085  &mq_cancel,
2086  receiver,
2087  NULL,
2088  &mq_error,
2089  receiver);
2090  receiver->qh =
2092  &receiver->target,
2093  receiver->foreign_addr,
2094  receiver->mtu,
2095  receiver->nt,
2097  receiver->mq);
2098 }
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:550
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 1233 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().

1234 {
1235  const struct UDPAck *ack = cls;
1236  struct ReceiverAddress *receiver = value;
1237 
1238  (void)pid;
1239  for (struct SharedSecret *ss = receiver->ss_head; NULL != ss; ss = ss->next)
1240  {
1241  if (0 == memcmp(&ack->cmac, &ss->cmac, sizeof(struct GNUNET_HashCode)))
1242  {
1243  uint32_t allowed;
1244 
1245  allowed = ntohl(ack->sequence_max);
1246 
1247  if (allowed > ss->sequence_allowed)
1248  {
1249  receiver->acks_available += (allowed - ss->sequence_allowed);
1250  if ((allowed - ss->sequence_allowed) == receiver->acks_available)
1251  {
1252  /* we just incremented from zero => MTU change! */
1253  setup_receiver_mq(receiver);
1254  }
1255  ss->sequence_allowed = allowed;
1256  /* move ss to head to avoid discarding it anytime soon! */
1257  GNUNET_CONTAINER_DLL_remove(receiver->ss_head, receiver->ss_tail, ss);
1258  GNUNET_CONTAINER_DLL_insert(receiver->ss_head, receiver->ss_tail, ss);
1259  }
1260  return GNUNET_NO;
1261  }
1262  }
1263  return GNUNET_YES;
1264 }
#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:78
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:77
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 1276 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().

1279 {
1280  const struct GNUNET_MessageHeader *hdr =
1281  (const struct GNUNET_MessageHeader *)buf;
1282  const struct UDPAck *ack = (const struct UDPAck *)buf;
1283  uint16_t type;
1284 
1285  if (sizeof(*hdr) > buf_size)
1286  return; /* not even a header */
1287  if (ntohs(hdr->size) > buf_size)
1288  return; /* not even a header */
1289  type = ntohs(hdr->type);
1290  switch (type)
1291  {
1293  /* lookup master secret by 'cmac', then update sequence_max */
1295  &sender->target,
1296  &handle_ack,
1297  (void *)ack);
1298  /* There could be more messages after the ACK, handle those as well */
1299  buf += ntohs(hdr->size);
1300  buf_size -= ntohs(hdr->size);
1301  pass_plaintext_to_core(sender, buf, buf_size);
1302  break;
1303 
1305  /* skip padding */
1306  break;
1307 
1308  default:
1309  pass_plaintext_to_core(sender, buf, buf_size);
1310  }
1311 }
#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 1323 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().

1324 {
1325  GNUNET_assert(NULL != ss->sender);
1326  /* drop ancient KeyCacheEntries */
1327  while ((NULL != ss->kce_head) &&
1328  (MAX_SQN_DELTA <
1330  kce_destroy(ss->kce_tail);
1331  if (ss->active_kce_count < KCN_THRESHOLD)
1332  {
1333  struct UDPAck ack;
1334 
1335  while (ss->active_kce_count < KCN_TARGET)
1336  kce_generate(ss, ++ss->sequence_allowed);
1337  ack.header.type = htons(GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK);
1338  ack.header.size = htons(sizeof(ack));
1339  ack.sequence_max = htonl(ss->sequence_allowed);
1340  ack.cmac = ss->cmac;
1342  &ss->sender->target,
1344  &ack.header);
1345  }
1346 }
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 1357 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().

1360 {
1361  struct SharedSecret *ss = kce->ss;
1362  char out_buf[box_len - sizeof(*box)];
1363 
1364  GNUNET_assert(NULL != ss->sender);
1365  if (GNUNET_OK != try_decrypt(ss,
1366  box->gcm_tag,
1367  kce->sequence_number,
1368  (const char *)&box[1],
1369  sizeof(out_buf),
1370  out_buf))
1371  {
1373  "# Decryption failures with valid KCE",
1374  1,
1375  GNUNET_NO);
1376  kce_destroy(kce);
1377  return;
1378  }
1379  kce_destroy(kce);
1381  "# bytes decrypted with BOX",
1382  sizeof(out_buf),
1383  GNUNET_NO);
1384  try_handle_plaintext(ss->sender, out_buf, sizeof(out_buf));
1385  consider_ss_ack(ss);
1386 }
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:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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 1419 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().

1422 {
1423  struct SearchContext *sc = cls;
1424  struct SenderAddress *sender = value;
1425 
1426  if ((sender->address_len == sc->address_len) &&
1427  (0 == memcmp(sender->address, sc->address, sender->address_len)))
1428  {
1429  sc->sender = sender;
1430  return GNUNET_NO; /* stop iterating! */
1431  }
1432  return GNUNET_YES;
1433 }
socklen_t address_len
Number of bytes in address.
socklen_t address_len
Length of the address.
#define GNUNET_NO
Definition: gnunet_common.h:78
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:220
Information we track per sender address we have recently been in contact with (we decrypt messages fr...
#define GNUNET_YES
Definition: gnunet_common.h:77
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 1448 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().

1451 {
1452  struct SenderAddress *sender;
1453  struct SearchContext sc = { .address = address,
1454  .address_len = address_len,
1455  .sender = NULL };
1456 
1458  target,
1460  &sc);
1461  if (NULL != sc.sender)
1462  {
1464  return sc.sender;
1465  }
1466  sender = GNUNET_new(struct SenderAddress);
1467  sender->target = *target;
1469  sender->address_len = address_len;
1471  senders,
1472  &sender->target,
1473  sender,
1476  "# senders active",
1478  GNUNET_NO);
1479  sender->timeout =
1482  sender,
1483  sender->timeout.abs_value_us);
1485  if (NULL == timeout_task)
1487  return sender;
1488 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:306
struct GNUNET_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:78
#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:1264
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:220
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 1499 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().

1501 {
1502  struct UdpHandshakeSignature uhs;
1503 
1505  uhs.purpose.size = htonl(sizeof(uhs));
1506  uhs.sender = uc->sender;
1507  uhs.receiver = my_identity;
1508  uhs.ephemeral = *ephemeral;
1509  uhs.monotonic_time = uc->monotonic_time;
1511  &uhs.purpose,
1512  &uc->sender_sig,
1513  &uc->sender.public_key);
1514 }
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:1116
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 1526 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().

1528 {
1529  char *ret;
1530 
1531  switch (address->sa_family)
1532  {
1533  case AF_INET:
1534  GNUNET_asprintf(&ret,
1535  "%s-%s",
1537  GNUNET_a2s(address, address_len));
1538  break;
1539 
1540  case AF_INET6:
1541  GNUNET_asprintf(&ret,
1542  "%s-%s",
1544  GNUNET_a2s(address, address_len));
1545  break;
1546 
1547  default:
1548  GNUNET_assert(0);
1549  }
1550  return ret;
1551 }
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
static int ret
Final status code.
Definition: gnunet-arm.c:89
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 1560 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_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().

1561 {
1562  struct sockaddr_storage sa;
1563  socklen_t salen = sizeof(sa);
1564  char buf[UINT16_MAX];
1565  ssize_t rcvd;
1566 
1567  (void)cls;
1569  udp_sock,
1570  &sock_read,
1571  NULL);
1573  buf,
1574  sizeof(buf),
1575  (struct sockaddr *)&sa,
1576  &salen);
1577  if (-1 == rcvd)
1578  {
1580  return;
1581  }
1582 
1583  /* first, see if it is a UDPBox */
1584  if (rcvd > sizeof(struct UDPBox))
1585  {
1586  const struct UDPBox *box;
1587  struct KeyCacheEntry *kce;
1588 
1589  box = (const struct UDPBox *)buf;
1591  if (NULL != kce)
1592  {
1593  decrypt_box(box, (size_t)rcvd, kce);
1594  return;
1595  }
1596  }
1597 
1598  /* next, check if it is a broadcast */
1599  if (sizeof(struct UDPBroadcast) == rcvd)
1600  {
1601  const struct UDPBroadcast *ub;
1602  struct UdpBroadcastSignature uhs;
1603 
1604  ub = (const struct UDPBroadcast *)buf;
1605  uhs.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST);
1606  uhs.purpose.size = htonl(sizeof(uhs));
1607  uhs.sender = ub->sender;
1608  GNUNET_CRYPTO_hash(&sa, salen, &uhs.h_address);
1609  if (GNUNET_OK ==
1611  &uhs.purpose,
1612  &ub->sender_sig,
1613  &ub->sender.public_key))
1614  {
1615  char *addr_s;
1616  enum GNUNET_NetworkType nt;
1617 
1618  addr_s =
1619  sockaddr_to_udpaddr_string((const struct sockaddr *)&sa, salen);
1620  GNUNET_STATISTICS_update(stats, "# broadcasts received", 1, GNUNET_NO);
1621  /* use our own mechanism to determine network type */
1622  nt =
1623  GNUNET_NT_scanner_get_type(is, (const struct sockaddr *)&sa, salen);
1624  GNUNET_TRANSPORT_application_validate(ah, &ub->sender, nt, addr_s);
1625  GNUNET_free(addr_s);
1626  return;
1627  }
1628  /* continue with KX, mostly for statistics... */
1629  }
1630 
1631 
1632  /* finally, test if it is a KX */
1633  if (rcvd < sizeof(struct UDPConfirmation) + sizeof(struct InitialKX))
1634  {
1636  "# messages dropped (no kid, too small for KX)",
1637  1,
1638  GNUNET_NO);
1639  return;
1640  }
1641 
1642  {
1643  const struct InitialKX *kx;
1644  struct SharedSecret *ss;
1645  char pbuf[rcvd - sizeof(struct InitialKX)];
1646  const struct UDPConfirmation *uc;
1647  struct SenderAddress *sender;
1648 
1649  kx = (const struct InitialKX *)buf;
1651  if (GNUNET_OK != try_decrypt(ss,
1652  kx->gcm_tag,
1653  0,
1654  &buf[sizeof(*kx)],
1655  sizeof(pbuf),
1656  pbuf))
1657  {
1658  GNUNET_free(ss);
1660  stats,
1661  "# messages dropped (no kid, AEAD decryption failed)",
1662  1,
1663  GNUNET_NO);
1664  return;
1665  }
1666  uc = (const struct UDPConfirmation *)pbuf;
1667  if (GNUNET_OK != verify_confirmation(&kx->ephemeral, uc))
1668  {
1669  GNUNET_break_op(0);
1670  GNUNET_free(ss);
1672  "# messages dropped (sender signature invalid)",
1673  1,
1674  GNUNET_NO);
1675  return;
1676  }
1677  calculate_cmac(ss);
1678  sender = setup_sender(&uc->sender, (const struct sockaddr *)&sa, salen);
1679  ss->sender = sender;
1680  GNUNET_CONTAINER_DLL_insert(sender->ss_head, sender->ss_tail, ss);
1681  sender->num_secrets++;
1682  GNUNET_STATISTICS_update(stats, "# Secrets active", 1, GNUNET_NO);
1684  "# messages decrypted without BOX",
1685  1,
1686  GNUNET_NO);
1687  try_handle_plaintext(sender, &uc[1], sizeof(pbuf) - sizeof(*uc));
1688  consider_ss_ack(ss);
1689  if (sender->num_secrets > MAX_SECRETS)
1690  secret_destroy(sender->ss_tail);
1691  }
1692 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:306
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:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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:1116
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:44
#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...
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:1467
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:742
#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 1703 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().

1704 {
1705  struct sockaddr *in;
1706  unsigned int port;
1707  char dummy[2];
1708  char *colon;
1709  char *cp;
1710 
1711  if (1 == sscanf(bindto, "%u%1s", &port, dummy))
1712  {
1713  /* interpreting value as just a PORT number */
1714  if (port > UINT16_MAX)
1715  {
1717  "BINDTO specification `%s' invalid: value too large for port\n",
1718  bindto);
1719  return NULL;
1720  }
1721  if ((GNUNET_NO == GNUNET_NETWORK_test_pf(PF_INET6)) ||
1722  (GNUNET_YES ==
1725  "DISABLE_V6")))
1726  {
1727  struct sockaddr_in *i4;
1728 
1729  i4 = GNUNET_malloc(sizeof(struct sockaddr_in));
1730  i4->sin_family = AF_INET;
1731  i4->sin_port = htons((uint16_t)port);
1732  *sock_len = sizeof(struct sockaddr_in);
1733  in = (struct sockaddr *)i4;
1734  }
1735  else
1736  {
1737  struct sockaddr_in6 *i6;
1738 
1739  i6 = GNUNET_malloc(sizeof(struct sockaddr_in6));
1740  i6->sin6_family = AF_INET6;
1741  i6->sin6_port = htons((uint16_t)port);
1742  *sock_len = sizeof(struct sockaddr_in6);
1743  in = (struct sockaddr *)i6;
1744  }
1745  return in;
1746  }
1747  cp = GNUNET_strdup(bindto);
1748  colon = strrchr(cp, ':');
1749  if (NULL != colon)
1750  {
1751  /* interpet value after colon as port */
1752  *colon = '\0';
1753  colon++;
1754  if (1 == sscanf(colon, "%u%1s", &port, dummy))
1755  {
1756  /* interpreting value as just a PORT number */
1757  if (port > UINT16_MAX)
1758  {
1760  "BINDTO specification `%s' invalid: value too large for port\n",
1761  bindto);
1762  GNUNET_free(cp);
1763  return NULL;
1764  }
1765  }
1766  else
1767  {
1768  GNUNET_log(
1770  "BINDTO specification `%s' invalid: last ':' not followed by number\n",
1771  bindto);
1772  GNUNET_free(cp);
1773  return NULL;
1774  }
1775  }
1776  else
1777  {
1778  /* interpret missing port as 0, aka pick any free one */
1779  port = 0;
1780  }
1781  {
1782  /* try IPv4 */
1783  struct sockaddr_in v4;
1784 
1785  if (1 == inet_pton(AF_INET, cp, &v4))
1786  {
1787  v4.sin_port = htons((uint16_t)port);
1788  in = GNUNET_memdup(&v4, sizeof(v4));
1789  *sock_len = sizeof(v4);
1790  GNUNET_free(cp);
1791  return in;
1792  }
1793  }
1794  {
1795  /* try IPv6 */
1796  struct sockaddr_in6 v6;
1797  const char *start;
1798 
1799  start = cp;
1800  if (('[' == *cp) && (']' == cp[strlen(cp) - 1]))
1801  {
1802  start++; /* skip over '[' */
1803  cp[strlen(cp) - 1] = '\0'; /* eat ']' */
1804  }
1805  if (1 == inet_pton(AF_INET6, start, &v6))
1806  {
1807  v6.sin6_port = htons((uint16_t)port);
1808  in = GNUNET_memdup(&v6, sizeof(v6));
1809  *sock_len = sizeof(v6);
1810  GNUNET_free(cp);
1811  return in;
1812  }
1813  }
1814  /* #5528 FIXME (feature!): maybe also try getnameinfo()? */
1815  GNUNET_free(cp);
1816  return NULL;
1817 }
#define COMMUNICATOR_CONFIG_SECTION
Configuration section used by the communicator.
static int start
Set if we are to start default services (including ARM).
Definition: gnunet-arm.c:39
#define GNUNET_NO
Definition: gnunet_common.h:78
#define GNUNET_memdup(buf, size)
Allocate and initialize a block of memory.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
static struct in_addr dummy
Target "dummy" address of the packet we pretend to respond to.
static uint16_t port
Port number.
Definition: gnunet-bcd.c:81
#define GNUNET_log(kind,...)
#define GNUNET_YES
Definition: gnunet_common.h:77
int GNUNET_CONFIGURATION_get_value_yesno(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option)
Get a configuration value that should be in a set of "YES" or "NO".
static const struct GNUNET_CONFIGURATION_Handle * cfg
Our configuration.
#define GNUNET_malloc(size)
Wrapper around malloc.
int GNUNET_NETWORK_test_pf(int pf)
Test if the given protocol family is supported by this system.
Definition: network.c:78
#define GNUNET_free(ptr)
Wrapper around free.
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◆ 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 1828 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().

1829 {
1830  char pad[pad_size];
1831 
1833  if (sizeof(pad) > sizeof(struct GNUNET_MessageHeader))
1834  {
1835  struct GNUNET_MessageHeader hdr =
1836  { .size = htons(sizeof(pad)),
1838 
1839  memcpy(pad, &hdr, sizeof(hdr));
1840  }
1841  GNUNET_assert(
1842  0 ==
1843  gcry_cipher_encrypt(out_cipher, dgram, sizeof(pad), pad, sizeof(pad)));
1844 }
#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 1856 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_assert, GNUNET_break, GNUNET_CRYPTO_ecdhe_key_create2(), GNUNET_CRYPTO_ecdhe_key_get_public(), GNUNET_CRYPTO_eddsa_sign(), GNUNET_ERROR_TYPE_WARNING, 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().

1859 {
1860  struct ReceiverAddress *receiver = impl_state;
1861  uint16_t msize = ntohs(msg->size);
1862 
1863  GNUNET_assert(mq == receiver->mq);
1864  if (msize > receiver->mtu)
1865  {
1866  GNUNET_break(0);
1867  receiver_destroy(receiver);
1868  return;
1869  }
1870  reschedule_receiver_timeout(receiver);
1871 
1872  if (0 == receiver->acks_available)
1873  {
1874  /* use KX encryption method */
1875  struct UdpHandshakeSignature uhs;
1876  struct UDPConfirmation uc;
1877  struct InitialKX kx;
1878  struct GNUNET_CRYPTO_EcdhePrivateKey epriv;
1879  char dgram[receiver->mtu + sizeof(uc) + sizeof(kx)];
1880  size_t dpos;
1881  gcry_cipher_hd_t out_cipher;
1882  struct SharedSecret *ss;
1883 
1884  /* setup key material */
1886 
1887  ss = setup_shared_secret_enc(&epriv, receiver);
1888  setup_cipher(&ss->master, 0, &out_cipher);
1889  /* compute 'uc' */
1890  uc.sender = my_identity;
1891  uc.monotonic_time =
1893  uhs.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_UDP_HANDSHAKE);
1894  uhs.purpose.size = htonl(sizeof(uhs));
1895  uhs.sender = my_identity;
1896  uhs.receiver = receiver->target;
1897  GNUNET_CRYPTO_ecdhe_key_get_public(&epriv, &uhs.ephemeral);
1898  uhs.monotonic_time = uc.monotonic_time;
1900  &uhs.purpose,
1901  &uc.sender_sig));
1902  /* Leave space for kx */
1903  dpos = sizeof(struct GNUNET_CRYPTO_EcdhePublicKey);
1904  /* Append encrypted uc to dgram */
1905  GNUNET_assert(0 == gcry_cipher_encrypt(out_cipher,
1906  &dgram[dpos],
1907  sizeof(uc),
1908  &uc,
1909  sizeof(uc)));
1910  dpos += sizeof(uc);
1911  /* Append encrypted payload to dgram */
1912  GNUNET_assert(
1913  0 == gcry_cipher_encrypt(out_cipher, &dgram[dpos], msize, msg, msize));
1914  dpos += msize;
1915  do_pad(out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
1916  /* Datagram starts with kx */
1917  kx.ephemeral = uhs.ephemeral;
1918  GNUNET_assert(
1919  0 == gcry_cipher_gettag(out_cipher, kx.gcm_tag, sizeof(kx.gcm_tag)));
1920  gcry_cipher_close(out_cipher);
1921  memcpy(dgram, &kx, sizeof(kx));
1923  dgram,
1924  sizeof(dgram),
1925  receiver->address,
1926  receiver->address_len))
1929  return;
1930  } /* End of KX encryption method */
1931 
1932  /* begin "BOX" encryption method, scan for ACKs from tail! */
1933  for (struct SharedSecret *ss = receiver->ss_tail; NULL != ss; ss = ss->prev)
1934  {
1935  if (ss->sequence_used < ss->sequence_allowed)
1936  {
1937  char dgram[sizeof(struct UDPBox) + receiver->mtu];
1938  struct UDPBox *box;
1939  gcry_cipher_hd_t out_cipher;
1940  size_t dpos;
1941 
1942  box = (struct UDPBox *)dgram;
1943  ss->sequence_used++;
1944  get_kid(&ss->master, ss->sequence_used, &box->kid);
1945  setup_cipher(&ss->master, ss->sequence_used, &out_cipher);
1946  /* Append encrypted payload to dgram */
1947  dpos = sizeof(struct UDPBox);
1948  GNUNET_assert(
1949  0 == gcry_cipher_encrypt(out_cipher, &dgram[dpos], msize, msg, msize));
1950  dpos += msize;
1951  do_pad(out_cipher, &dgram[dpos], sizeof(dgram) - dpos);
1952  GNUNET_assert(0 == gcry_cipher_gettag(out_cipher,
1953  box->gcm_tag,
1954  sizeof(box->gcm_tag)));
1955  gcry_cipher_close(out_cipher);
1957  dgram,
1958  sizeof(dgram),
1959  receiver->address,
1960  receiver->address_len))
1963  receiver->acks_available--;
1964  if (0 == receiver->acks_available)
1965  {
1966  /* We have no more ACKs => MTU change! */
1967  setup_receiver_mq(receiver);
1968  }
1969  return;
1970  }
1971  }
1972  GNUNET_assert(0);
1973 }
int GNUNET_CRYPTO_ecdhe_key_create2(struct GNUNET_CRYPTO_EcdhePrivateKey *pk)
Create a new private key.
Definition: crypto_ecc.c:632
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:989
static struct GNUNET_FS_UnindexContext * uc
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format...
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:838
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:303
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:805
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.
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and encr...
static void receiver_destroy(struct ReceiverAddress *receiver)
Destroys a receiving state due to timeout or shutdown.
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:655
void GNUNET_MQ_impl_send_continue(struct GNUNET_MQ_Handle *mq)
Call the send implementation for the next queued message, if any.
Definition: mq.c:484
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 1985 of file gnunet-communicator-udp.c.

References ReceiverAddress::mq, and receiver_destroy().

Referenced by setup_receiver_mq().

1986 {
1987  struct ReceiverAddress *receiver = impl_state;
1988 
1989  if (mq == receiver->mq)
1990  {
1991  receiver->mq = NULL;
1992  receiver_destroy(receiver);
1993  }
1994 }
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 2004 of file gnunet-communicator-udp.c.

References GNUNET_assert.

Referenced by setup_receiver_mq().

2005 {
2006  /* Cancellation is impossible with UDP; bail */
2007  GNUNET_assert(0);
2008 }
#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 2021 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().

2022 {
2023  struct ReceiverAddress *receiver = cls;
2024 
2026  "MQ error in queue to %s: %d\n",
2027  GNUNET_i2s(&receiver->target),
2028  (int)error);
2029  receiver_destroy(receiver);
2030 }
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 2120 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().

2121 {
2122  struct ReceiverAddress *receiver;
2123  const char *path;
2124  struct sockaddr *in;
2125  socklen_t in_len;
2126 
2127  if (0 != strncmp(address,
2129  strlen(COMMUNICATOR_ADDRESS_PREFIX "-")))
2130  {
2131  GNUNET_break_op(0);
2132  return GNUNET_SYSERR;
2133  }
2134  path = &address[strlen(COMMUNICATOR_ADDRESS_PREFIX "-")];
2135  in = udp_address_to_sockaddr(path, &in_len);
2136 
2137  receiver = GNUNET_new(struct ReceiverAddress);
2138  receiver->address = in;
2139  receiver->address_len = in_len;
2140  receiver->target = *peer;
2141  receiver->nt = GNUNET_NT_scanner_get_type(is, in, in_len);
2143  receivers,
2144  &receiver->target,
2145  receiver,
2147  receiver->timeout =
2150  receiver,
2151  receiver->timeout.abs_value_us);
2153  "# receivers active",
2155  GNUNET_NO);
2156  receiver->foreign_addr =
2157  sockaddr_to_udpaddr_string(receiver->address, receiver->address_len);
2158  setup_receiver_mq(receiver);
2159  if (NULL == timeout_task)
2161  return GNUNET_OK;
2162 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:306
struct GNUNET_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:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
#define GNUNET_new(type)
Allocate a struct or union of the given type.
static 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:1264
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:76
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 2174 of file gnunet-communicator-udp.c.

References GNUNET_OK, receiver_destroy(), and value.

Referenced by do_shutdown().

2177 {
2178  struct ReceiverAddress *receiver = value;
2179 
2180  (void)cls;
2181  (void)target;
2182  receiver_destroy(receiver);
2183  return GNUNET_OK;
2184 }
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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 2196 of file gnunet-communicator-udp.c.

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

Referenced by do_shutdown().

2199 {
2200  struct SenderAddress *sender = value;
2201 
2202  (void)cls;
2203  (void)target;
2204  sender_destroy(sender);
2205  return GNUNET_OK;
2206 }
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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 2215 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().

2216 {
2217  if (NULL != nat)
2218  {
2220  nat = NULL;
2221  }
2222  while (NULL != bi_head)
2224  if (NULL != broadcast_task)
2225  {
2227  broadcast_task = NULL;
2228  }
2229  if (NULL != read_task)
2230  {
2232  read_task = NULL;
2233  }
2234  if (NULL != udp_sock)
2235  {
2237  udp_sock = NULL;
2238  }
2241  NULL);
2248  if (NULL != ch)
2249  {
2251  ch = NULL;
2252  }
2253  if (NULL != ah)
2254  {
2256  ah = NULL;
2257  }
2258  if (NULL != stats)
2259  {
2261  stats = NULL;
2262  }
2263  if (NULL != my_private_key)
2264  {
2266  my_private_key = NULL;
2267  }
2268  if (NULL != is)
2269  {
2271  is = NULL;
2272  }
2273 }
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:78
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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:419
void GNUNET_NAT_unregister(struct GNUNET_NAT_Handle *nh)
Stop port redirection and public IP address detection for the given handle.
Definition: nat_api.c:690
static int get_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:548
#define GNUNET_free(ptr)
Wrapper around free.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:956
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◆ enc_notify_cb()

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

Function called when the transport service has received 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 2286 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().

2289 {
2290  const struct UDPAck *ack;
2291 
2292  (void)cls;
2293  if ((ntohs(msg->type) != GNUNET_MESSAGE_TYPE_COMMUNICATOR_UDP_ACK) ||
2294  (ntohs(msg->size) != sizeof(struct UDPAck)))
2295  {
2296  GNUNET_break_op(0);
2297  return;
2298  }
2299  ack = (const struct UDPAck *)msg;
2301  sender,
2302  &handle_ack,
2303  (void *)ack);
2304 }
#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 2321 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().

2327 {
2328  char *my_addr;
2330 
2331  if (GNUNET_YES == add_remove)
2332  {
2333  enum GNUNET_NetworkType nt;
2334 
2335  GNUNET_asprintf(&my_addr,
2336  "%s-%s",
2338  GNUNET_a2s(addr, addrlen));
2339  nt = GNUNET_NT_scanner_get_type(is, addr, addrlen);
2340  ai =
2342  my_addr,
2343  nt,
2345  GNUNET_free(my_addr);
2346  *app_ctx = ai;
2347  }
2348  else
2349  {
2350  ai = *app_ctx;
2352  *app_ctx = NULL;
2353  }
2354 }
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:306
struct GNUNET_TRANSPORT_AddressIdentifier * GNUNET_TRANSPORT_communicator_address_add(struct GNUNET_TRANSPORT_CommunicatorHandle *ch, const char *address, enum GNUNET_NetworkType nt, struct GNUNET_TIME_Relative expiration)
Notify transport service about an address that this communicator provides for this peer...
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
GNUNET_NetworkType
Types of networks (with separate quotas) we support.
Definition: gnunet_nt_lib.h:35
int GNUNET_asprintf(char **buf, const char *format,...)
Like asprintf, just portable.
#define COMMUNICATOR_ADDRESS_PREFIX
Address prefix used by the communicator.
#define GNUNET_TIME_UNIT_FOREVER_REL
Constant used to specify "forever".
const char * GNUNET_a2s(const struct sockaddr *addr, socklen_t addrlen)
Convert a "struct sockaddr*" (IPv4 or IPv6 address) to a string (for printing debug messages)...
static struct GNUNET_NAT_AUTO_Test * nt
Handle to a NAT test operation.
void GNUNET_TRANSPORT_communicator_address_remove(struct GNUNET_TRANSPORT_AddressIdentifier *ai)
Notify transport service about an address that this communicator no longer provides for this peer...
static struct GNUNET_TRANSPORT_AddressIdentifier * ai
Handle to the operation that publishes our address.
#define GNUNET_YES
Definition: gnunet_common.h:77
static struct GNUNET_TRANSPORT_CommunicatorHandle * ch
Our environment.
Internal representation of an address a communicator is currently providing for the transport service...
#define GNUNET_free(ptr)
Wrapper around free.
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◆ ifc_broadcast()

static void ifc_broadcast ( void *  cls)
static

Broadcast our presence on one of our interfaces.

Parameters
clsa struct BroadcastInterface

Definition at line 2363 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().

2364 {
2365  struct BroadcastInterface *bi = cls;
2366  struct GNUNET_TIME_Relative delay;
2367 
2369  delay.rel_value_us =
2371  bi->broadcast_task =
2373 
2374  switch (bi->sa->sa_family)
2375  {
2376  case AF_INET: {
2377  static int yes = 1;
2378  static int no = 0;
2379  ssize_t sent;
2380 
2382  SOL_SOCKET,
2383  SO_BROADCAST,
2384  &yes,
2385  sizeof(int)))
2388  &bi->bcm,
2389  sizeof(bi->bcm),
2390  bi->ba,
2391  bi->salen);
2392  if (-1 == sent)
2395  SOL_SOCKET,
2396  SO_BROADCAST,
2397  &no,
2398  sizeof(int)))
2400  break;
2401  }
2402 
2403  case AF_INET6: {
2404  ssize_t sent;
2405  struct sockaddr_in6 dst;
2406 
2407  dst.sin6_family = AF_INET6;
2408  dst.sin6_port = htons(my_port);
2409  dst.sin6_addr = bi->mcreq.ipv6mr_multiaddr;
2410  dst.sin6_scope_id = ((struct sockaddr_in6 *)bi->ba)->sin6_scope_id;
2411 
2413  &bi->bcm,
2414  sizeof(bi->bcm),
2415  (const struct sockaddr *)&dst,
2416  sizeof(dst));
2417  if (-1 == sent)
2419  break;
2420  }
2421 
2422  default:
2423  GNUNET_break(0);
2424  break;
2425  }
2426 }
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:871
#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:75
#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:1237
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:838
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 2444 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().

2451 {
2452  struct BroadcastInterface *bi;
2453  enum GNUNET_NetworkType network;
2454  struct UdpBroadcastSignature ubs;
2455 
2456  (void)cls;
2457  (void)netmask;
2458  if (NULL == addr)
2459  return GNUNET_YES; /* need to know our address! */
2460  network = GNUNET_NT_scanner_get_type(is, addr, addrlen);
2461  if (GNUNET_NT_LOOPBACK == network)
2462  {
2463  /* Broadcasting on loopback does not make sense */
2464  return GNUNET_YES;
2465  }
2466  for (bi = bi_head; NULL != bi; bi = bi->next)
2467  {
2468  if ((bi->salen == addrlen) && (0 == memcmp(addr, bi->sa, addrlen)))
2469  {
2470  bi->found = GNUNET_YES;
2471  return GNUNET_OK;
2472  }
2473  }
2474 
2475  if ((AF_INET6 == addr->sa_family) && (NULL == broadcast_addr))
2476  return GNUNET_OK; /* broadcast_addr is required for IPv6! */
2477  if ((AF_INET6 == addr->sa_family) && (GNUNET_YES != have_v6_socket))
2478  return GNUNET_OK; /* not using IPv6 */
2479 
2480  bi = GNUNET_new(struct BroadcastInterface);
2481  bi->sa = GNUNET_memdup(addr, addrlen);
2482  if (NULL != broadcast_addr)
2483  bi->ba = GNUNET_memdup(broadcast_addr, addrlen);
2484  bi->salen = addrlen;
2485  bi->found = GNUNET_YES;
2486  bi->bcm.sender = my_identity;
2487  ubs.purpose.purpose = htonl(GNUNET_SIGNATURE_COMMUNICATOR_UDP_BROADCAST);
2488  ubs.purpose.size = htonl(sizeof(ubs));
2489  ubs.sender = my_identity;
2490  GNUNET_CRYPTO_hash(addr, addrlen, &ubs.h_address);
2492  &ubs.purpose,
2493  &bi->bcm.sender_sig));
2496  if ((AF_INET6 == addr->sa_family) && (NULL != broadcast_addr))
2497  {
2498  /* Create IPv6 multicast request */
2499  const struct sockaddr_in6 *s6 =
2500  (const struct sockaddr_in6 *)broadcast_addr;
2501 
2502  GNUNET_assert(
2503  1 == inet_pton(AF_INET6, "FF05::13B", &bi->mcreq.ipv6mr_multiaddr));
2504 
2505  /* http://tools.ietf.org/html/rfc2553#section-5.2:
2506  *
2507  * IPV6_JOIN_GROUP
2508  *
2509  * Join a multicast group on a specified local interface. If the
2510  * interface index is specified as 0, the kernel chooses the local
2511  * interface. For example, some kernels look up the multicast
2512  * group in the normal IPv6 routing table and using the resulting
2513  * interface; we do this for each interface, so no need to use
2514  * zero (anymore...).
2515  */
2516  bi->mcreq.ipv6mr_interface = s6->sin6_scope_id;
2517 
2518  /* Join the multicast group */
2520  IPPROTO_IPV6,
2521  IPV6_JOIN_GROUP,
2522  &bi->mcreq,
2523  sizeof(bi->mcreq)))
2524  {
2526  }
2527  }
2528  return GNUNET_OK;
2529 }
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:871
enum GNUNET_NetworkType GNUNET_NT_scanner_get_type(struct GNUNET_NT_InterfaceScanner *is, const struct sockaddr *addr, socklen_t addrlen)
Returns where the address is located: loopback, LAN or WAN.
Definition: nt.c:306
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:989
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:75
#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:44
#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:1264
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:44
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:77
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 2538 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().

2539 {
2540  struct BroadcastInterface *bin;
2541 
2542  (void)cls;
2543  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bi->next)
2544  bi->found = GNUNET_NO;
2546  for (struct BroadcastInterface *bi = bi_head; NULL != bi; bi = bin)
2547  {
2548  bin = bi->next;
2549  if (GNUNET_NO == bi->found)
2550  bi_destroy(bi);
2551  }
2553  &do_broadcast,
2554  NULL);
2555 }
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:78
void GNUNET_OS_network_interfaces_list(GNUNET_OS_NetworkInterfaceProcessor proc, void *proc_cls)
Enumerate all network interfaces.
Definition: os_network.c:388
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:1237
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 2567 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_filename(), 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().

2571 {
2572  char *bindto;
2573  struct sockaddr *in;
2574  socklen_t in_len;
2575  struct sockaddr_storage in_sto;
2576  socklen_t sto_len;
2577 
2578  (void)cls;
2579  cfg = c;
2580  if (GNUNET_OK !=
2583  "BINDTO",
2584  &bindto))
2585  {
2588  "BINDTO");
2589  return;
2590  }
2591 
2592  in = udp_address_to_sockaddr(bindto, &in_len);
2593  if (NULL == in)
2594  {
2596  "Failed to setup UDP socket address with path `%s'\n",
2597  bindto);
2598  GNUNET_free(bindto);
2599  return;
2600  }
2601  udp_sock =
2602  GNUNET_NETWORK_socket_create(in->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2603  if (NULL == udp_sock)
2604  {
2606  GNUNET_free(in);
2607  GNUNET_free(bindto);
2608  return;
2609  }
2610  if (AF_INET6 == in->sa_family)
2612  if (GNUNET_OK != GNUNET_NETWORK_socket_bind(udp_sock, in, in_len))
2613  {
2616  udp_sock = NULL;
2617  GNUNET_free(in);
2618  GNUNET_free(bindto);
2619  return;
2620  }
2621  /* We might have bound to port 0, allowing the OS to figure it out;
2622  thus, get the real IN-address from the socket */
2623  sto_len = sizeof(in_sto);
2624  if (0 != getsockname(GNUNET_NETWORK_get_fd(udp_sock),
2625  (struct sockaddr *)&in_sto,
2626  &sto_len))
2627  {
2628  memcpy(&in_sto, in, in_len);
2629  sto_len = in_len;
2630  }
2631  GNUNET_free(in);
2632  GNUNET_free(bindto);
2633  in = (struct sockaddr *)&in_sto;
2634  in_len = sto_len;
2636  "Bound to `%s'\n",
2637  GNUNET_a2s((const struct sockaddr *)&in_sto, sto_len));
2638  switch (in->sa_family)
2639  {
2640  case AF_INET:
2641  my_port = ntohs(((struct sockaddr_in *)in)->sin_port);
2642  break;
2643 
2644  case AF_INET6:
2645  my_port = ntohs(((struct sockaddr_in6 *)in)->sin6_port);
2646  break;
2647 
2648  default:
2649  GNUNET_break(0);
2650  my_port = 0;
2651  }
2652  stats = GNUNET_STATISTICS_create("C-UDP", cfg);
2656  receivers_heap =
2662  if (NULL == my_private_key)
2663  {
2664  GNUNET_log(
2666  _(
2667  "Transport service is lacking key configuration settings. Exiting.\n"));
2669  return;
2670  }
2672  /* start reading */
2674  udp_sock,
2675  &sock_read,
2676  NULL);
2681  &mq_init,
2682  NULL,
2683  &enc_notify_cb,
2684  NULL);
2685  if (NULL == ch)
2686  {
2687  GNUNET_break(0);
2689  return;
2690  }
2692  if (NULL == ah)
2693  {
2694  GNUNET_break(0);
2696  return;
2697  }
2698  /* start broadcasting */
2699  if (GNUNET_YES !=
2702  "DISABLE_BROADCAST"))
2703  {
2705  }
2708  IPPROTO_UDP,
2709  1 /* one address */,
2710  (const struct sockaddr **)&in,
2711  &in_len,
2712  &nat_address_cb,
2713  NULL /* FIXME: support reversal: #5529 */,
2714  NULL /* closure */);
2715 }
int GNUNET_NETWORK_get_fd(const struct GNUNET_NETWORK_Handle *desc)
Return file descriptor for this network handle.
Definition: network.c:1068
#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:1284
struct GNUNET_STATISTICS_Handle * GNUNET_STATISTICS_create(const char *subsystem, const struct GNUNET_CONFIGURATION_Handle *cfg)
Get handle for the statistics service.
static struct 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:474
static struct GNUNET_NT_InterfaceScanner * is
Network scanner to determine network types.
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
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:517
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:181
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:1264
#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.
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:376
struct GNUNET_NT_InterfaceScanner * GNUNET_NT_scanner_init(void)
Initialize the address characterization client handle.
Definition: nt.c:399
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:272
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.
int GNUNET_CONFIGURATION_get_value_filename(const struct GNUNET_CONFIGURATION_Handle *cfg, const char *section, const char *option, char **value)
Get a configuration value that should be the name of a file or directory.
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:77
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_read_net(struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified delay or when the specified file descriptor is ready f...
Definition: scheduler.c:1467
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:548
#define GNUNET_free(ptr)
Wrapper around free.
struct GNUNET_CRYPTO_EddsaPublicKey public_key
struct GNUNET_NETWORK_Handle * GNUNET_NETWORK_socket_create(int domain, int type, int protocol)
Create a new socket.
Definition: network.c:900
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◆ main()

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

The main function for the UNIX communicator.

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

Definition at line 2726 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().

2727 {
2728  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
2730  };
2731  int ret;
2732 
2733  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args(argc, argv, &argc, &argv))
2734  return 2;
2735 
2736  ret = (GNUNET_OK == GNUNET_PROGRAM_run(argc,
2737  argv,
2738  "gnunet-communicator-udp",
2739  _("GNUnet UDP communicator"),
2740  options,
2741  &run,
2742  NULL))
2743  ? 0
2744  : 1;
2745  GNUNET_free((void *)argv);
2746  return ret;
2747 }
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
static void run(void *cls, char *const *args, const char *cfgfile, const struct GNUNET_CONFIGURATION_Handle *c)
Setup communicator and launch network interactions.
int GNUNET_STRINGS_get_utf8_args(int argc, char *const *argv, int *u8argc, char *const **u8argv)
Returns utf-8 encoded arguments.
Definition: strings.c:1439
#define GNUNET_OK
Named constants for return values.
Definition: gnunet_common.h:75
Definition of a command line option.
static int ret
Final status code.
Definition: gnunet-arm.c:89
struct GNUNET_GETOPT_CommandLineOption GNUNET_GETOPT_OPTION_END
Definition: 002.c:13
#define _(String)
GNU gettext support macro.
Definition: platform.h:181
int GNUNET_PROGRAM_run(int argc, char *const *argv, const char *binaryName, const char *binaryHelp, const struct GNUNET_GETOPT_CommandLineOption *options, GNUNET_PROGRAM_Main task, void *task_cls)
Run a standard GNUnet command startup sequence (initialize loggers and configuration, parse options).
Definition: program.c:367
#define GNUNET_free(ptr)
Wrapper around free.
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Variable Documentation

◆ key_cache

struct GNUNET_CONTAINER_MultiShortmap* key_cache
static

Cache of pre-generated key IDs.

Definition at line 633 of file gnunet-communicator-udp.c.

◆ read_task

struct GNUNET_SCHEDULER_Task* read_task
static

ID of read task.

Definition at line 638 of file gnunet-communicator-udp.c.

◆ timeout_task

struct GNUNET_SCHEDULER_Task* timeout_task
static

ID of timeout task.

Definition at line 643 of file gnunet-communicator-udp.c.

◆ broadcast_task

struct GNUNET_SCHEDULER_Task* broadcast_task
static

ID of master broadcast task.

Definition at line 648 of file gnunet-communicator-udp.c.

◆ stats

struct GNUNET_STATISTICS_Handle* stats
static

For logging statistics.

Definition at line 653 of file gnunet-communicator-udp.c.

◆ ch

Our environment.

Definition at line 658 of file gnunet-communicator-udp.c.

◆ receivers

struct GNUNET_CONTAINER_MultiPeerMap* receivers
static

Receivers (map from peer identity to struct ReceiverAddress)

Definition at line 663 of file gnunet-communicator-udp.c.

◆ senders

struct GNUNET_CONTAINER_MultiPeerMap* senders
static

Senders (map from peer identity to struct SenderAddress)

Definition at line 668 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 673 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 678 of file gnunet-communicator-udp.c.

◆ bi_head

struct BroadcastInterface* bi_head
static

Broadcast interface tasks.

Kept in a DLL.

Definition at line 683 of file gnunet-communicator-udp.c.

◆ bi_tail

struct BroadcastInterface* bi_tail
static

Broadcast interface tasks.

Kept in a DLL.

Definition at line 688 of file gnunet-communicator-udp.c.

◆ udp_sock

struct GNUNET_NETWORK_Handle* udp_sock
static

Our socket.

Definition at line 693 of file gnunet-communicator-udp.c.

◆ have_v6_socket

int have_v6_socket
static

GNUNET_YES if udp_sock supports IPv6.

Definition at line 698 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 703 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 708 of file gnunet-communicator-udp.c.

◆ cfg

const struct GNUNET_CONFIGURATION_Handle* cfg
static

Our configuration.

Definition at line 713 of file gnunet-communicator-udp.c.

◆ ah

Our handle to report addresses for validation to TRANSPORT.

Definition at line 718 of file gnunet-communicator-udp.c.

◆ is

struct GNUNET_NT_InterfaceScanner* is
static

Network scanner to determine network types.

Definition at line 723 of file gnunet-communicator-udp.c.

◆ nat

struct GNUNET_NAT_Handle* nat
static

Connection to NAT service.

Definition at line 728 of file gnunet-communicator-udp.c.

◆ my_port

uint16_t my_port
static

Port number to which we are actually bound.

Definition at line 733 of file gnunet-communicator-udp.c.

Referenced by ifc_broadcast(), and run().