cloudflared-mirror/ingress/origin_proxy.go

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package ingress
import (
"fmt"
"net"
"net/http"
"net/url"
"strings"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/h2mux"
"github.com/cloudflare/cloudflared/websocket"
"github.com/pkg/errors"
)
// HTTPOriginProxy can be implemented by origin services that want to proxy http requests.
type HTTPOriginProxy interface {
// RoundTrip is how cloudflared proxies eyeball requests to the actual origin services
http.RoundTripper
}
// StreamBasedOriginProxy can be implemented by origin services that want to proxy at the L4 level.
type StreamBasedOriginProxy interface {
EstablishConnection(r *http.Request) (OriginConnection, error)
}
func (o *unixSocketPath) RoundTrip(req *http.Request) (*http.Response, error) {
return o.transport.RoundTrip(req)
}
// TODO: TUN-3636: establish connection to origins over UDS
func (*unixSocketPath) EstablishConnection(r *http.Request) (OriginConnection, error) {
return nil, fmt.Errorf("Unix socket service currently doesn't support proxying connections")
}
func (o *httpService) RoundTrip(req *http.Request) (*http.Response, error) {
// Rewrite the request URL so that it goes to the origin service.
req.URL.Host = o.url.Host
req.URL.Scheme = o.url.Scheme
return o.transport.RoundTrip(req)
}
func (o *httpService) EstablishConnection(req *http.Request) (OriginConnection, error) {
req.URL.Host = o.url.Host
req.URL.Scheme = websocket.ChangeRequestScheme(o.url)
return newWSConnection(o.transport, req)
}
func (o *helloWorld) RoundTrip(req *http.Request) (*http.Response, error) {
// Rewrite the request URL so that it goes to the Hello World server.
req.URL.Host = o.server.Addr().String()
req.URL.Scheme = "https"
return o.transport.RoundTrip(req)
}
func (o *helloWorld) EstablishConnection(req *http.Request) (OriginConnection, error) {
req.URL.Host = o.server.Addr().String()
req.URL.Scheme = "wss"
return newWSConnection(o.transport, req)
}
func (o *statusCode) RoundTrip(_ *http.Request) (*http.Response, error) {
return o.resp, nil
}
func (o *bridgeService) EstablishConnection(r *http.Request) (OriginConnection, error) {
dest, err := o.destination(r)
if err != nil {
return nil, err
}
return o.client.connect(r, dest)
}
// getRequestHost returns the host of the http.Request.
func getRequestHost(r *http.Request) (string, error) {
if r.Host != "" {
return r.Host, nil
}
if r.URL != nil {
return r.URL.Host, nil
}
return "", errors.New("host not found")
}
func (o *bridgeService) destination(r *http.Request) (string, error) {
if connection.IsTCPStream(r) {
return getRequestHost(r)
}
jumpDestination := r.Header.Get(h2mux.CFJumpDestinationHeader)
if jumpDestination == "" {
return "", fmt.Errorf("Did not receive final destination from client. The --destination flag is likely not set on the client side")
}
// Strip scheme and path set by client. Without a scheme
// Parsing a hostname and path without scheme might not return an error due to parsing ambiguities
if jumpURL, err := url.Parse(jumpDestination); err == nil && jumpURL.Host != "" {
return removePath(jumpURL.Host), nil
}
return removePath(jumpDestination), nil
}
func removePath(dest string) string {
return strings.SplitN(dest, "/", 2)[0]
}
func (o *singleTCPService) EstablishConnection(r *http.Request) (OriginConnection, error) {
return o.client.connect(r, o.dest)
}
type tcpClient struct {
streamHandler streamHandlerFunc
}
func (c *tcpClient) connect(r *http.Request, addr string) (OriginConnection, error) {
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
return &tcpConnection{
conn: conn,
streamHandler: c.streamHandler,
}, nil
}