// NewTransport returns a new HTTP transport. If tlsConfig is nil, it uses the
// default TLS configuration.
func NewTransport(tlsConfig *tls.Config) *http.Transport {
if tlsConfig == nil {
var cfg = tlsconfig.ServerDefault
tlsConfig = &cfg
}
direct := &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}
base := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: direct.Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: tlsConfig,
// TODO(dmcgowan): Call close idle connections when complete and use keep alive
DisableKeepAlives: true,
}
proxyDialer, err := sockets.DialerFromEnvironment(direct)
if err == nil {
base.Dial = proxyDialer.Dial
}
return base
}
func newTransport() *http.Transport {
direct := &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: direct.Dial,
TLSHandshakeTimeout: 10 * time.Second,
// TODO(dmcgowan): Call close idle connections when complete and use keep alive
DisableKeepAlives: true,
}
proxyDialer, err := sockets.DialerFromEnvironment(direct)
if err == nil {
tr.Dial = proxyDialer.Dial
}
return tr
}
// We need to copy Go's implementation of tls.Dial (pkg/cryptor/tls/tls.go) in
// order to return our custom tlsClientCon struct which holds both the tls.Conn
// object _and_ its underlying raw connection. The rationale for this is that
// we need to be able to close the write end of the connection when attaching,
// which tls.Conn does not provide.
func tlsDialWithDialer(dialer *net.Dialer, network, addr string, config *tls.Config) (net.Conn, error) {
// We want the Timeout and Deadline values from dialer to cover the
// whole process: TCP connection and TLS handshake. This means that we
// also need to start our own timers now.
timeout := dialer.Timeout
if !dialer.Deadline.IsZero() {
deadlineTimeout := dialer.Deadline.Sub(time.Now())
if timeout == 0 || deadlineTimeout < timeout {
timeout = deadlineTimeout
}
}
var errChannel chan error
if timeout != 0 {
errChannel = make(chan error, 2)
time.AfterFunc(timeout, func() {
errChannel <- errors.New("")
})
}
proxyDialer, err := sockets.DialerFromEnvironment(dialer)
if err != nil {
return nil, err
}
rawConn, err := proxyDialer.Dial(network, addr)
if err != nil {
return nil, err
}
// When we set up a TCP connection for hijack, there could be long periods
// of inactivity (a long running command with no output) that in certain
// network setups may cause ECONNTIMEOUT, leaving the client in an unknown
// state. Setting TCP KeepAlive on the socket connection will prohibit
// ECONNTIMEOUT unless the socket connection truly is broken
if tcpConn, ok := rawConn.(*net.TCPConn); ok {
tcpConn.SetKeepAlive(true)
tcpConn.SetKeepAlivePeriod(30 * time.Second)
}
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
// If no ServerName is set, infer the ServerName
// from the hostname we're connecting to.
if config.ServerName == "" {
// Make a copy to avoid polluting argument or default.
config = tlsconfig.Clone(config)
config.ServerName = hostname
}
conn := tls.Client(rawConn, config)
if timeout == 0 {
err = conn.Handshake()
} else {
go func() {
errChannel <- conn.Handshake()
}()
err = <-errChannel
}
if err != nil {
rawConn.Close()
return nil, err
}
// This is Docker difference with standard's crypto/tls package: returned a
// wrapper which holds both the TLS and raw connections.
return &tlsClientCon{conn, rawConn}, nil
}
// NewV2Repository returns a repository (v2 only). It creates an HTTP transport
// providing timeout settings and authentication support, and also verifies the
// remote API version.
func NewV2Repository(ctx context.Context, repoInfo *registry.RepositoryInfo, endpoint registry.APIEndpoint, metaHeaders http.Header, authConfig *types.AuthConfig, actions ...string) (repo distribution.Repository, foundVersion bool, err error) {
repoName := repoInfo.FullName()
// If endpoint does not support CanonicalName, use the RemoteName instead
if endpoint.TrimHostname {
repoName = repoInfo.RemoteName()
}
direct := &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}
// TODO(dmcgowan): Call close idle connections when complete, use keep alive
base := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: direct.Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: endpoint.TLSConfig,
// TODO(dmcgowan): Call close idle connections when complete and use keep alive
DisableKeepAlives: true,
}
proxyDialer, err := sockets.DialerFromEnvironment(direct)
if err == nil {
base.Dial = proxyDialer.Dial
}
modifiers := registry.DockerHeaders(dockerversion.DockerUserAgent(ctx), metaHeaders)
authTransport := transport.NewTransport(base, modifiers...)
challengeManager, foundVersion, err := registry.PingV2Registry(endpoint.URL, authTransport)
if err != nil {
transportOK := false
if responseErr, ok := err.(registry.PingResponseError); ok {
transportOK = true
err = responseErr.Err
}
return nil, foundVersion, fallbackError{
err: err,
confirmedV2: foundVersion,
transportOK: transportOK,
}
}
if authConfig.RegistryToken != "" {
passThruTokenHandler := &existingTokenHandler{token: authConfig.RegistryToken}
modifiers = append(modifiers, auth.NewAuthorizer(challengeManager, passThruTokenHandler))
} else {
creds := registry.NewStaticCredentialStore(authConfig)
tokenHandlerOptions := auth.TokenHandlerOptions{
Transport: authTransport,
Credentials: creds,
Scopes: []auth.Scope{
auth.RepositoryScope{
Repository: repoName,
Actions: actions,
},
},
ClientID: registry.AuthClientID,
}
tokenHandler := auth.NewTokenHandlerWithOptions(tokenHandlerOptions)
basicHandler := auth.NewBasicHandler(creds)
modifiers = append(modifiers, auth.NewAuthorizer(challengeManager, tokenHandler, basicHandler))
}
tr := transport.NewTransport(base, modifiers...)
repoNameRef, err := distreference.ParseNamed(repoName)
if err != nil {
return nil, foundVersion, fallbackError{
err: err,
confirmedV2: foundVersion,
transportOK: true,
}
}
repo, err = client.NewRepository(ctx, repoNameRef, endpoint.URL.String(), tr)
if err != nil {
err = fallbackError{
err: err,
confirmedV2: foundVersion,
transportOK: true,
}
}
return
}