int cmd_import( REPLY *r, const char *addr_str) {
char addrbuf[FULL_ADDSTRLEN+1];
IP addr;
int rc;
/* If the address contains no port - use the default port */
if( (rc = addr_parse_full( &addr, addr_str, DHT_PORT, gconf->af )) == ADDR_PARSE_SUCCESS ) {
if( kad_ping( &addr ) == 0 ) {
r_printf( r, "Send ping to: %s\n", str_addr( &addr, addrbuf ) );
return 0;
} else {
r_printf( r, "Failed to send ping.\n" );
return 1;
}
} else if( rc == ADDR_PARSE_CANNOT_RESOLVE ) {
r_printf( r, "Failed to resolve address.\n" );
return 1;
} else if( rc == ADDR_PARSE_NO_ADDR_FOUND ) {
r_printf( r, "Failed to aquire address of required protocol.\n" );
return 1;
} else {
r_printf( r, "Failed to parse address.\n" );
return 1;
}
}
void handle_mcast( int rc, int sock_recv ) {
char addrbuf[FULL_ADDSTRLEN+1];
char buf[512];
IP c_addr;
socklen_t addrlen;
int rc_recv;
if( g_mcast_time <= time_now_sec() ) {
if( kad_count_nodes( 0 ) == 0 ) {
/* Join multicast group if possible */
if( g_mcast_registered == 0 && multicast_set_groups( sock_recv, &g_lpd_addr, gconf->dht_ifname, 1 ) == 0 ) {
log_info( "LPD: No peers known. Joined multicast group." );
g_mcast_registered = 1;
}
if( g_mcast_registered == 1 ) {
log_info( "LPD: Send multicast message to find nodes." );
/* Create message */
snprintf(
buf, sizeof(buf),
msg_fmt, str_addr( &g_lpd_addr, addrbuf ),
atoi( gconf->dht_port ), g_infohash
);
mcast_send_packets( buf, gconf->dht_ifname );
}
}
/* Cap number of received packets to 10 per minute */
g_packet_limit = 5 * PACKET_LIMIT_MAX;
/* Try again in ~5 minutes */
g_mcast_time = time_add_min( 5 );
}
if( rc <= 0 ) {
return;
}
/* Reveice multicast ping */
addrlen = sizeof(IP);
rc_recv = recvfrom( sock_recv, buf, sizeof(buf), 0, (struct sockaddr*) &c_addr, (socklen_t*) &addrlen );
if( rc_recv < 0 ) {
log_warn( "LPD: Cannot receive multicast message: %s", strerror( errno ) );
return;
}
if( g_packet_limit < 0 ) {
/* Too much traffic - leave multicast group for now */
if( g_mcast_registered == 1 && multicast_set_groups( sock_recv, &g_lpd_addr, gconf->dht_ifname, 0 ) == 0 ) {
log_warn( "LPD: Too much traffic. Left multicast group." );
g_mcast_registered = 0;
}
return;
} else {
g_packet_limit--;
}
if( rc_recv >= sizeof(buf) ) {
return;
} else {
buf[rc_recv] = '\0';
}
int port = parse_packet( buf );
if( port > 0 ) {
port_set( &c_addr, port );
log_debug( "LPD: Ping lonely peer at %s", str_addr( &c_addr, addrbuf ) );
kad_ping( &c_addr );
} else {
log_debug( "LPD: Received invalid packet on multicast group." );
}
}
