/* return 0 if data could not be put in packet queue.
* return 1 if data was put into the queue.
*/
int write_cryptpacket(Net_Crypto *c, int crypt_connection_id, uint8_t *data, uint32_t length)
{
if (crypt_connection_id_not_valid(c, crypt_connection_id))
return 0;
if (length - crypto_box_BOXZEROBYTES + crypto_box_ZEROBYTES > MAX_DATA_SIZE - 1)
return 0;
if (c->crypto_connections[crypt_connection_id].status != CRYPTO_CONN_ESTABLISHED)
return 0;
uint8_t temp_data[MAX_DATA_SIZE];
int len = encrypt_data_fast(c->crypto_connections[crypt_connection_id].shared_key,
c->crypto_connections[crypt_connection_id].sent_nonce,
data, length, temp_data + 1);
if (len == -1)
return 0;
temp_data[0] = 3;
if (write_packet(c->lossless_udp, c->crypto_connections[crypt_connection_id].number, temp_data, len + 1) == 0)
return 0;
increment_nonce(c->crypto_connections[crypt_connection_id].sent_nonce);
return 1;
}
/* return 0 if there is no received data in the buffer.
* return -1 if the packet was discarded.
* return length of received data if successful.
*/
int read_cryptpacket(Net_Crypto *c, int crypt_connection_id, uint8_t *data)
{
if (crypt_connection_id_not_valid(c, crypt_connection_id))
return 0;
if (c->crypto_connections[crypt_connection_id].status != CRYPTO_CONN_ESTABLISHED)
return 0;
uint8_t temp_data[MAX_DATA_SIZE];
int length = read_packet(c->lossless_udp, c->crypto_connections[crypt_connection_id].number, temp_data);
if (length == 0)
return 0;
if (temp_data[0] != 3)
return -1;
int len = decrypt_data_fast(c->crypto_connections[crypt_connection_id].shared_key,
c->crypto_connections[crypt_connection_id].recv_nonce,
temp_data + 1, length - 1, data);
if (len != -1) {
increment_nonce(c->crypto_connections[crypt_connection_id].recv_nonce);
return len;
}
return -1;
}
/* returns the number of packet slots left in the sendbuffer.
* return 0 if failure.
*/
uint32_t crypto_num_free_sendqueue_slots(Net_Crypto *c, int crypt_connection_id)
{
if (crypt_connection_id_not_valid(c, crypt_connection_id))
return 0;
return num_free_sendqueue_slots(c->lossless_udp, c->crypto_connections[crypt_connection_id].number);
}
/* Kill a crypto connection.
*
* return 0 if killed successfully.
* return 1 if there was a problem.
*/
int crypto_kill(Net_Crypto *c, int crypt_connection_id)
{
if (crypt_connection_id_not_valid(c, crypt_connection_id))
return 1;
if (c->crypto_connections[crypt_connection_id].status != CRYPTO_CONN_NO_CONNECTION) {
c->crypto_connections[crypt_connection_id].status = CRYPTO_CONN_NO_CONNECTION;
kill_connection(c->lossless_udp, c->crypto_connections[crypt_connection_id].number);
memset(&(c->crypto_connections[crypt_connection_id]), 0 , sizeof(Crypto_Connection));
c->crypto_connections[crypt_connection_id].number = ~0;
uint32_t i;
for (i = c->crypto_connections_length; i != 0; --i) {
if (c->crypto_connections[i - 1].status != CRYPTO_CONN_NO_CONNECTION)
break;
}
if (c->crypto_connections_length != i) {
c->crypto_connections_length = i;
realloc_cryptoconnection(c, c->crypto_connections_length);
}
return 0;
}
return 1;
}
