Add support for forwarding Docker client through SOCKS proxy

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

daemon/info.go

@@ -20,6 +20,7 @@ import (
 	"github.com/docker/docker/utils"
 	"github.com/docker/docker/volume/drivers"
 	"github.com/docker/engine-api/types"
+	"github.com/docker/go-connections/sockets"
 )
 
 // SystemInfo returns information about the host server the daemon is running on.
@@ -97,9 +98,9 @@ func (daemon *Daemon) SystemInfo() (*types.Info, error) {
 		ServerVersion:      dockerversion.Version,
 		ClusterStore:       daemon.configStore.ClusterStore,
 		ClusterAdvertise:   daemon.configStore.ClusterAdvertise,
-		HTTPProxy:          getProxyEnv("http_proxy"),
-		HTTPSProxy:         getProxyEnv("https_proxy"),
-		NoProxy:            getProxyEnv("no_proxy"),
+		HTTPProxy:          sockets.GetProxyEnv("http_proxy"),
+		HTTPSProxy:         sockets.GetProxyEnv("https_proxy"),
+		NoProxy:            sockets.GetProxyEnv("no_proxy"),
 	}
 
 	// TODO Windows. Refactor this more once sysinfo is refactored into

integration-cli/docker_utils.go

@@ -196,7 +196,7 @@ func (d *Daemon) getClientConfig() (*clientConfig, error) {
 		transport = &http.Transport{}
 	}
 
-	sockets.ConfigureTransport(transport, proto, addr)
+	d.c.Assert(sockets.ConfigureTransport(transport, proto, addr), check.IsNil)
 
 	return &clientConfig{
 		transport: transport,

pkg/plugins/client.go

@@ -30,7 +30,9 @@ func NewClient(addr string, tlsConfig tlsconfig.Options) (*Client, error) {
 	tr.TLSClientConfig = c
 
 	protoAndAddr := strings.Split(addr, "://")
-	sockets.ConfigureTransport(tr, protoAndAddr[0], protoAndAddr[1])
+	if err := sockets.ConfigureTransport(tr, protoAndAddr[0], protoAndAddr[1]); err != nil {
+		return nil, err
+	}
 
 	scheme := protoAndAddr[0]
 	if scheme != "https" {