/* Create a new path or use an old suitable one (if pathnum is valid)
* or a rondom one from onion_paths.
*
* return -1 on failure
* return 0 on success
*
* TODO: Make this function better, it currently probably is vulnerable to some attacks that
* could de anonimize us.
*/
static int random_path(const DHT *dht, Onion_Client_Paths *onion_paths, uint32_t pathnum, Onion_Path *path)
{
if (pathnum >= NUMBER_ONION_PATHS)
pathnum = rand() % NUMBER_ONION_PATHS;
if (is_timeout(onion_paths->last_path_success[pathnum], ONION_PATH_TIMEOUT)
|| is_timeout(onion_paths->path_creation_time[pathnum], ONION_PATH_MAX_LIFETIME)) {
Node_format nodes[3];
if (random_nodes_path(dht, nodes, 3) != 3)
return -1;
int n = is_path_used(onion_paths, nodes);
if (n == -1) {
if (create_onion_path(dht, &onion_paths->paths[pathnum], nodes) == -1)
return -1;
onion_paths->last_path_success[pathnum] = unix_time() + ONION_PATH_FIRST_TIMEOUT - ONION_PATH_TIMEOUT;
onion_paths->path_creation_time[pathnum] = unix_time();
} else {
pathnum = n;
}
}
memcpy(path, &onion_paths->paths[pathnum], sizeof(Onion_Path));
return 0;
}
/* Put up to max_num random nodes in nodes.
*
* return the number of nodes.
*/
static uint16_t random_nodes_path_onion(const Onion_Client *onion_c, Node_format *nodes, uint16_t max_num)
{
unsigned int i;
if (!max_num)
return 0;
unsigned int num_nodes = (onion_c->path_nodes_index < MAX_PATH_NODES) ? onion_c->path_nodes_index : MAX_PATH_NODES;
//if (DHT_non_lan_connected(onion_c->dht)) {
if (DHT_isconnected(onion_c->dht)) {
if (num_nodes < 3)
return random_nodes_path(onion_c->dht, nodes, max_num);
for (i = 0; i < max_num; ++i) {
nodes[i] = onion_c->path_nodes[rand() % num_nodes];
}
} else {
if (num_nodes == 0)
return 0;
nodes[0].ip_port.ip.family = TCP_FAMILY;
for (i = 1; i < max_num; ++i) {
nodes[i] = onion_c->path_nodes[rand() % num_nodes];
}
}
return max_num;
}
/* Takes 3 random nodes that we know and puts them in nodes
*
* nodes must be longer than 3.
*
* return -1 on failure
* return 0 on success
*
*/
int random_path(Onion_Client *onion_c, Node_format *nodes)
{
if (random_nodes_path(onion_c->dht, nodes, 3) != 3)
return -1;
return 0;
}
