static int send_getnodes(const Group_Chat *chat, IP_Port ip_port, int peernum)
{
if ((uint32_t)peernum >= chat->numpeers)
return -1;
if (!is_timeout(chat->group[peernum].last_pinged, GROUP_PING_TIMEOUT))
return -1;
getnodes_data contents;
contents.pingid = random_64b();
chat->group[peernum].last_pinged = unix_time();
chat->group[peernum].pingid = contents.pingid;
chat->group[peernum].ping_via = ip_port;
if (chat->assoc) {
IPPTs ippts;
ippts.timestamp = unix_time();
ippts.ip_port = ip_port;
Assoc_add_entry(chat->assoc, chat->group[peernum].client_id, &ippts, NULL, 1);
}
return send_groupchatpacket(chat, ip_port, chat->group[peernum].client_id, (uint8_t *)&contents, sizeof(contents),
CRYPTO_PACKET_GROUP_CHAT_GET_NODES);
}
static void do_TCP_confirmed(TCP_Server *TCP_server)
{
#ifdef TCP_SERVER_USE_EPOLL
if (TCP_server->last_run_pinged == unix_time()) {
return;
}
TCP_server->last_run_pinged = unix_time();
#endif
uint32_t i;
for (i = 0; i < TCP_server->size_accepted_connections; ++i) {
TCP_Secure_Connection *conn = &TCP_server->accepted_connection_array[i];
if (conn->status != TCP_STATUS_CONFIRMED) {
continue;
}
if (is_timeout(conn->last_pinged, TCP_PING_FREQUENCY)) {
uint8_t ping[1 + sizeof(uint64_t)];
ping[0] = TCP_PACKET_PING;
uint64_t ping_id = random_64b();
if (!ping_id) {
++ping_id;
}
memcpy(ping + 1, &ping_id, sizeof(uint64_t));
int ret = write_packet_TCP_secure_connection(conn, ping, sizeof(ping), 1);
if (ret == 1) {
conn->last_pinged = unix_time();
conn->ping_id = ping_id;
} else {
if (is_timeout(conn->last_pinged, TCP_PING_FREQUENCY + TCP_PING_TIMEOUT)) {
kill_accepted(TCP_server, i);
continue;
}
}
}
if (conn->ping_id && is_timeout(conn->last_pinged, TCP_PING_TIMEOUT)) {
kill_accepted(TCP_server, i);
continue;
}
send_pending_data(conn);
#ifndef TCP_SERVER_USE_EPOLL
do_confirmed_recv(TCP_server, i);
#endif
}
}
static void do_TCP_confirmed(TCP_Server *TCP_server)
{
uint32_t i;
for (i = 0; i < TCP_server->size_accepted_connections; ++i) {
TCP_Secure_Connection *conn = &TCP_server->accepted_connection_array[i];
if (conn->status != TCP_STATUS_CONFIRMED)
continue;
if (is_timeout(conn->last_pinged, TCP_PING_FREQUENCY)) {
uint8_t ping[1 + sizeof(uint64_t)];
ping[0] = TCP_PACKET_PING;
uint64_t ping_id = random_64b();
if (!ping_id)
++ping_id;
memcpy(ping + 1, &ping_id, sizeof(uint64_t));
int ret = write_packet_TCP_secure_connection(conn, ping, sizeof(ping));
if (ret == 1) {
conn->last_pinged = unix_time();
conn->ping_id = ping_id;
}
}
if (conn->ping_id && is_timeout(conn->last_pinged, TCP_PING_TIMEOUT)) {
kill_TCP_connection(conn);
del_accepted(TCP_server, i);
continue;
}
send_pending_data(conn);
uint8_t packet[MAX_PACKET_SIZE];
int len;
while ((len = read_packet_TCP_secure_connection(conn->sock, &conn->next_packet_length, conn->shared_key,
conn->recv_nonce, packet, sizeof(packet)))) {
if (len == -1) {
kill_TCP_connection(conn);
del_accepted(TCP_server, i);
break;
}
if (handle_TCP_packet(TCP_server, i, packet, len) == -1) {
kill_TCP_connection(conn);
del_accepted(TCP_server, i);
break;
}
}
}
}
static int do_confirmed_TCP(TCP_Client_Connection *conn, void *userdata)
{
send_pending_data(conn);
send_ping_response(conn);
send_ping_request(conn);
uint8_t packet[MAX_PACKET_SIZE];
int len;
if (is_timeout(conn->last_pinged, TCP_PING_FREQUENCY)) {
uint64_t ping_id = random_64b();
if (!ping_id) {
++ping_id;
}
conn->ping_request_id = conn->ping_id = ping_id;
send_ping_request(conn);
conn->last_pinged = unix_time();
}
if (conn->ping_id && is_timeout(conn->last_pinged, TCP_PING_TIMEOUT)) {
conn->status = TCP_CLIENT_DISCONNECTED;
return 0;
}
while ((len = read_packet_TCP_secure_connection(conn->sock, &conn->next_packet_length, conn->shared_key,
conn->recv_nonce, packet, sizeof(packet)))) {
if (len == -1) {
conn->status = TCP_CLIENT_DISCONNECTED;
break;
}
if (handle_TCP_packet(conn, packet, len, userdata) == -1) {
conn->status = TCP_CLIENT_DISCONNECTED;
break;
}
}
return 0;
}
static size_t add_ping(PING *ping, IP_Port ipp) // O(n)
{
size_t p;
remove_timeouts(ping);
/* Remove oldest ping if full buffer. */
if (ping->num_pings == PING_NUM_MAX) {
ping->num_pings--;
ping->pos_pings = (ping->pos_pings + 1) % PING_NUM_MAX;
}
/* Insert new ping at end of list. */
p = (ping->pos_pings + ping->num_pings) % PING_NUM_MAX;
ping->pings[p].ip_port = ipp;
ping->pings[p].timestamp = unix_time();
ping->pings[p].id = random_64b();
ping->num_pings++;
return ping->pings[p].id;
}
uint64_t add_ping(IP_Port ipp) // O(n)
{
size_t p;
remove_timeouts();
// Remove oldest ping if full buffer
if (num_pings == PING_NUM_MAX) {
num_pings--;
pos_pings = (pos_pings + 1) % PING_NUM_MAX;
}
// Insert new ping at end of list
p = (pos_pings + num_pings) % PING_NUM_MAX;
pings[p].ipp = ipp;
pings[p].timestamp = now();
pings[p].id = random_64b();
num_pings++;
return pings[p].id;
}
TEST(random, ui64)
{
uint64_t a = random_64b();
uint64_t b = random_64b();
ASSERT_FALSE(a == b) << "You are very lucky this test has failed for you. The probability to fail equals 2.9*10^-39";
}