Esempio n. 1
// threadedProbeHosts tries to fetch the settings of a host. If successful, the
// host is put in the set of active hosts. If unsuccessful, the host id deleted
// from the set of active hosts.
func (hdb *HostDB) threadedProbeHosts() {
	defer hdb.threadGroup.Done()
	for hostEntry := range hdb.scanPool {
		// Request settings from the queued host entry.
		// TODO: use dialer.Cancel to shutdown quickly
		hdb.log.Debugln("Scanning", hostEntry.NetAddress, hostEntry.PublicKey)
		var settings modules.HostExternalSettings
		err := func() error {
			conn, err := hdb.dialer.DialTimeout(hostEntry.NetAddress, hostRequestTimeout)
			if err != nil {
				return err
			defer conn.Close()
			err = encoding.WriteObject(conn, modules.RPCSettings)
			if err != nil {
				return err
			var pubkey crypto.PublicKey
			copy(pubkey[:], hostEntry.PublicKey.Key)
			return crypto.ReadSignedObject(conn, &settings, maxSettingsLen, pubkey)
		if err != nil {
			hdb.log.Debugln("Scanning", hostEntry.NetAddress, hostEntry.PublicKey, "failed", err)
		} else {
			hdb.log.Debugln("Scanning", hostEntry.NetAddress, hostEntry.PublicKey, "succeeded")

		// Update the host tree to have a new entry.
		hdb.managedUpdateEntry(hostEntry, settings, err)
Esempio n. 2
// verifySettings reads a signed HostSettings object from conn, validates the
// signature, and checks for discrepancies between the known settings and the
// received settings. If there is a discrepancy, the hostDB is notified. The
// received settings are returned.
func verifySettings(conn net.Conn, host modules.HostDBEntry) (modules.HostDBEntry, error) {
	// convert host key (types.SiaPublicKey) to a crypto.PublicKey
	if host.PublicKey.Algorithm != types.SignatureEd25519 || len(host.PublicKey.Key) != crypto.PublicKeySize {
		build.Critical("hostdb did not filter out host with wrong signature algorithm:", host.PublicKey.Algorithm)
		return modules.HostDBEntry{}, errors.New("host used unsupported signature algorithm")
	var pk crypto.PublicKey
	copy(pk[:], host.PublicKey.Key)

	// read signed host settings
	var recvSettings modules.HostExternalSettings
	if err := crypto.ReadSignedObject(conn, &recvSettings, modules.NegotiateMaxHostExternalSettingsLen, pk); err != nil {
		return modules.HostDBEntry{}, errors.New("couldn't read host's settings: " + err.Error())
	// TODO: check recvSettings against host.HostExternalSettings. If there is
	// a discrepancy, write the error to conn.
	if recvSettings.NetAddress != host.NetAddress {
		// for now, just overwrite the NetAddress, since we know that
		// host.NetAddress works (it was the one we dialed to get conn)
		recvSettings.NetAddress = host.NetAddress
	host.HostExternalSettings = recvSettings
	return host, nil