static int handle_send_2(void *object, IP_Port source, const uint8_t *packet, uint32_t length)
{
Onion *onion = object;
if (length > ONION_MAX_PACKET_SIZE)
return 1;
if (length <= 1 + SEND_3)
return 1;
change_symmetric_key(onion);
uint8_t plain[ONION_MAX_PACKET_SIZE];
uint8_t shared_key[crypto_box_BEFORENMBYTES];
get_shared_key(&onion->shared_keys_3, shared_key, onion->dht->self_secret_key, packet + 1 + crypto_box_NONCEBYTES);
int len = decrypt_data_symmetric(shared_key, packet + 1, packet + 1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES,
length - (1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + RETURN_2), plain);
if ((uint32_t)len != length - (1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + RETURN_2 + crypto_box_MACBYTES))
return 1;
IP_Port send_to;
ipport_unpack(&send_to, plain);
to_host_family(&send_to.ip);
uint8_t data[ONION_MAX_PACKET_SIZE];
memcpy(data, plain + SIZE_IPPORT, len - SIZE_IPPORT);
uint32_t data_len = (len - SIZE_IPPORT);
uint8_t *ret_part = data + (len - SIZE_IPPORT);
new_nonce(ret_part);
uint8_t ret_data[RETURN_2 + SIZE_IPPORT];
ipport_pack(ret_data, &source);
memcpy(ret_data + SIZE_IPPORT, packet + (length - RETURN_2), RETURN_2);
len = encrypt_data_symmetric(onion->secret_symmetric_key, ret_part, ret_data, sizeof(ret_data),
ret_part + crypto_box_NONCEBYTES);
if (len != RETURN_3 - crypto_box_NONCEBYTES)
return 1;
data_len += RETURN_3;
if ((uint32_t)sendpacket(onion->net, send_to, data, data_len) != data_len)
return 1;
return 0;
}
static int handle_fakeid_announce(void *object, uint8_t *source_pubkey, uint8_t *data, uint32_t length)
{
Onion_Client *onion_c = object;
if (length < FAKEID_DATA_MIN_LENGTH)
return 1;
if (length > FAKEID_DATA_MAX_LENGTH)
return 1;
if ((length - FAKEID_DATA_MIN_LENGTH) % sizeof(Node_format) != 0)
return 1;
int friend_num = onion_friend_num(onion_c, source_pubkey);
if (friend_num == -1)
return 1;
if (memcmp(data + 1, onion_c->friends_list[friend_num].fake_client_id, crypto_box_PUBLICKEYBYTES) != 0) {
DHT_delfriend(onion_c->dht, onion_c->friends_list[friend_num].fake_client_id);
if (DHT_addfriend(onion_c->dht, data + 1) == 1) {
return 1;
}
memcpy(onion_c->friends_list[friend_num].fake_client_id, data + 1, crypto_box_PUBLICKEYBYTES);
}
uint16_t num_nodes = (length - FAKEID_DATA_MIN_LENGTH) / sizeof(Node_format);
Node_format nodes[num_nodes];
memcpy(nodes, data + 1 + crypto_box_PUBLICKEYBYTES, sizeof(nodes));
uint32_t i;
for (i = 0; i < num_nodes; ++i) {
to_host_family(&nodes[i].ip_port.ip);
DHT_getnodes(onion_c->dht, &nodes[i].ip_port, nodes[i].client_id, onion_c->friends_list[friend_num].fake_client_id);
}
//TODO replay protection
return 0;
}
static int client_ping_nodes(Onion_Client *onion_c, uint32_t num, Node_format *nodes, uint16_t num_nodes,
IP_Port source)
{
if (num > onion_c->num_friends)
return -1;
if (num_nodes == 0)
return 0;
Onion_Node *list_nodes = NULL;
uint8_t *reference_id = NULL;
if (num == 0) {
list_nodes = onion_c->clients_announce_list;
reference_id = onion_c->dht->c->self_public_key;
} else {
list_nodes = onion_c->friends_list[num - 1].clients_list;
reference_id = onion_c->friends_list[num - 1].real_client_id;
}
uint32_t i;
int lan_ips_accepted = (LAN_ip(source.ip) == 0);
for (i = 0; i < num_nodes; ++i) {
to_host_family(&nodes[i].ip_port.ip);
if (!lan_ips_accepted)
if (LAN_ip(nodes[i].ip_port.ip) == 0)
continue;
if (is_timeout(list_nodes[0].timestamp, ONION_NODE_TIMEOUT)
|| id_closest(reference_id, list_nodes[0].client_id, nodes[i].client_id) == 2) {
client_send_announce_request(onion_c, num, nodes[i].ip_port, nodes[i].client_id, NULL);
}
}
return 0;
}
static int handle_sendnodes(Group_Chat *chat, IP_Port source, int peernum, uint8_t *data, uint32_t len)
{
if ((uint32_t)peernum >= chat->numpeers)
return 1;
if (len > sizeof(sendnodes_data) || len < sizeof(uint64_t))
return 1;
if ((len - sizeof(uint64_t)) % sizeof(groupchat_nodes) != 0)
return 1;
if (is_timeout(chat->group[peernum].last_pinged, GROUP_PING_TIMEOUT))
return 1;
sendnodes_data contents;
memcpy(&contents, data, len);
if (contents.pingid != chat->group[peernum].pingid)
return 1;
uint16_t numnodes = (len - sizeof(contents.pingid)) / sizeof(groupchat_nodes);
uint32_t i;
IPPTs ippts_send;
ippts_send.timestamp = unix_time();
for (i = 0; i < numnodes; ++i) {
if (peer_okping(chat, contents.nodes[i].client_id) > 0) {
int peern = peer_in_chat(chat, contents.nodes[i].client_id);
if (peern == -1) { /*NOTE: This is just for testing and will be removed later.*/
peern = addpeer(chat, contents.nodes[i].client_id);
}
if (peern == -1)
continue;
to_host_family(&contents.nodes[i].ip_port.ip);
send_getnodes(chat, contents.nodes[i].ip_port, peern);
if (chat->assoc) {
ippts_send.ip_port = contents.nodes[i].ip_port;
Assoc_add_entry(chat->assoc, contents.nodes[i].client_id, &ippts_send, NULL, 0);
}
}
}
int ok = add_closepeer(chat, chat->group[peernum].client_id, source);
if (chat->assoc) {
ippts_send.ip_port = chat->group[peernum].ping_via;
ippts_send.timestamp = chat->group[peernum].last_pinged;
IP_Port ipp_recv;
ipp_recv = source;
Assoc_add_entry(chat->assoc, contents.nodes[i].client_id, &ippts_send, &ipp_recv, ok == 0 ? 1 : 0);
}
return 0;
}
