// newTargetServerEntryIterator is a helper for initializing the TargetServerEntry case
func newTargetServerEntryIterator(config *Config) (iterator *ServerEntryIterator, err error) {
serverEntry, err := protocol.DecodeServerEntry(
config.TargetServerEntry, common.GetCurrentTimestamp(), protocol.SERVER_ENTRY_SOURCE_TARGET)
if err != nil {
return nil, err
}
if config.EgressRegion != "" && serverEntry.Region != config.EgressRegion {
return nil, errors.New("TargetServerEntry does not support EgressRegion")
}
if config.TunnelProtocol != "" {
// Note: same capability/protocol mapping as in StoreServerEntry
requiredCapability := strings.TrimSuffix(config.TunnelProtocol, "-OSSH")
if !common.Contains(serverEntry.Capabilities, requiredCapability) {
return nil, errors.New("TargetServerEntry does not support TunnelProtocol")
}
}
iterator = &ServerEntryIterator{
isTargetServerEntryIterator: true,
hasNextTargetServerEntry: true,
targetServerEntry: serverEntry,
}
NoticeInfo("using TargetServerEntry: %s", serverEntry.IpAddress)
return iterator, nil
}
// doHandshakeRequest performs the "handshake" API request. The handshake
// returns upgrade info, newly discovered server entries -- which are
// stored -- and sponsor info (home pages, stat regexes).
func (serverContext *ServerContext) doHandshakeRequest() error {
params := serverContext.getBaseParams()
// *TODO*: this is obsolete?
/*
serverEntryIpAddresses, err := GetServerEntryIpAddresses()
if err != nil {
return common.ContextError(err)
}
// Submit a list of known servers -- this will be used for
// discovery statistics.
for _, ipAddress := range serverEntryIpAddresses {
params = append(params, requestParam{"known_server", ipAddress})
}
*/
var response []byte
if serverContext.psiphonHttpsClient == nil {
request, err := makeSSHAPIRequestPayload(params)
if err != nil {
return common.ContextError(err)
}
response, err = serverContext.tunnel.SendAPIRequest(
protocol.PSIPHON_API_HANDSHAKE_REQUEST_NAME, request)
if err != nil {
return common.ContextError(err)
}
} else {
// Legacy web service API request
responseBody, err := serverContext.doGetRequest(
makeRequestUrl(serverContext.tunnel, "", "handshake", params))
if err != nil {
return common.ContextError(err)
}
// Skip legacy format lines and just parse the JSON config line
configLinePrefix := []byte("Config: ")
for _, line := range bytes.Split(responseBody, []byte("\n")) {
if bytes.HasPrefix(line, configLinePrefix) {
response = line[len(configLinePrefix):]
break
}
}
if len(response) == 0 {
return common.ContextError(errors.New("no config line found"))
}
}
// Legacy fields:
// - 'preemptive_reconnect_lifetime_milliseconds' is unused and ignored
// - 'ssh_session_id' is ignored; client session ID is used instead
var handshakeResponse protocol.HandshakeResponse
err := json.Unmarshal(response, &handshakeResponse)
if err != nil {
return common.ContextError(err)
}
serverContext.clientRegion = handshakeResponse.ClientRegion
NoticeClientRegion(serverContext.clientRegion)
var decodedServerEntries []*protocol.ServerEntry
// Store discovered server entries
// We use the server's time, as it's available here, for the server entry
// timestamp since this is more reliable than the client time.
for _, encodedServerEntry := range handshakeResponse.EncodedServerList {
serverEntry, err := protocol.DecodeServerEntry(
encodedServerEntry,
common.TruncateTimestampToHour(handshakeResponse.ServerTimestamp),
protocol.SERVER_ENTRY_SOURCE_DISCOVERY)
if err != nil {
return common.ContextError(err)
}
err = protocol.ValidateServerEntry(serverEntry)
if err != nil {
// Skip this entry and continue with the next one
NoticeAlert("invalid server entry: %s", err)
continue
}
decodedServerEntries = append(decodedServerEntries, serverEntry)
}
// The reason we are storing the entire array of server entries at once rather
// than one at a time is that some desirable side-effects get triggered by
// StoreServerEntries that don't get triggered by StoreServerEntry.
err = StoreServerEntries(decodedServerEntries, true)
if err != nil {
return common.ContextError(err)
}
// TODO: formally communicate the sponsor and upgrade info to an
// outer client via some control interface.
for _, homepage := range handshakeResponse.Homepages {
NoticeHomepage(homepage)
}
serverContext.clientUpgradeVersion = handshakeResponse.UpgradeClientVersion
if handshakeResponse.UpgradeClientVersion != "" {
NoticeClientUpgradeAvailable(handshakeResponse.UpgradeClientVersion)
} else {
NoticeClientIsLatestVersion("")
}
var regexpsNotices []string
serverContext.statsRegexps, regexpsNotices = transferstats.MakeRegexps(
handshakeResponse.PageViewRegexes,
handshakeResponse.HttpsRequestRegexes)
for _, notice := range regexpsNotices {
NoticeAlert(notice)
}
serverContext.serverHandshakeTimestamp = handshakeResponse.ServerTimestamp
return nil
}