/*
* Lookup known nodes that are nearest to the given id.
*/
int kad_lookup_value( const char query[], IP addr_array[], size_t *addr_num ) {
char hexbuf[SHA1_HEX_LENGTH+1];
UCHAR id[SHA1_BIN_LENGTH];
int rc;
/* Generate the id, e.g. id = sha1(query) */
id_compute( id, query );
log_debug( "KAD: Lookup '%s' as '%s'.", query, str_id( id, hexbuf ) );
dht_lock();
rc = results_collect( id, addr_array, *addr_num );
if( rc < 0 ) {
/* No results item found - no search in progress - start search */
dht_lock();
results_add( id, query );
dht_search( id, 0, gconf->af, dht_callback_func, NULL );
dht_unlock();
*addr_num = 0;
rc = -1;
} else {
*addr_num = rc;
rc = 0;
}
dht_unlock();
return rc;
}
/*
* Lookup known nodes that are nearest to the given id.
*/
int kad_lookup_value( const char _query[], IP addr_array[], size_t *addr_num ) {
char query[QUERY_MAX_SIZE];
struct results_t *results;
int is_new;
int rc;
if( query_sanitize( query, sizeof(query), _query ) != 0 ) {
return -2;
}
log_debug( "KAD: Lookup string: %s", query );
dht_lock();
/* Find existing or create new item */
results = results_add( query, &is_new );
if( results && is_new ) {
/* Search own announced values */
kad_lookup_local_values( results );
}
if( results == NULL ) {
/* Failed to create a new search */
rc = -1;
} else if( results->done ) {
/*
* The search exists already but has finished. Restart the search when
* no results have been found or more than half of the searches lifetime
* has expired.
*/
if( results_entries_count( results ) == 0 ||
(time_now_sec() - results->start_time) > (MAX_SEARCH_LIFETIME / 2)
) {
/* Mark search as in progress */
results_done( results, 0 );
/* Start another search for this id */
dht_search( results->id, 0, gconf->af, dht_callback_func, NULL );
}
rc = 2;
} else if( is_new ) {
/* Start a new DHT search */
dht_search( results->id, 0, gconf->af, dht_callback_func, NULL );
rc = 1;
} else {
/* Search is still running */
rc = 0;
}
/* Collect addresses to be returned */
*addr_num = results_collect( results, addr_array, *addr_num );
dht_unlock();
return rc;
}
