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rproxy.go
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rproxy.go
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// Copyright 2016, Cong Ding. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// author: Cong Ding <dinggnu@gmail.com>
package rproxy
import (
"crypto/tls"
"errors"
"io"
"log"
"net"
"strings"
"time"
"github.com/ccding/go-rproxy/certs"
)
// RProxy is used to store configurations of the reverse proxy and start
// running the proxy.
type RProxy struct {
listenProto string
listenAddr string
backendProto string
backendAddr string
rootCert string
serverCert string
serverKey string
clientCert string
clientKey string
clientConfig *tls.Config
serverConfig *tls.Config
serverName string
verbose bool
}
// NewRProxyWithoutCerts creates an RProxy instance without setting
// certificate files, which is used in pure TCP setting or set the
// TLS configuration later.
func NewRProxyWithoutCerts(listenProto, listenAddr, backendProto, backendAddr string) *RProxy {
return &RProxy{
listenProto: strings.ToLower(listenProto),
listenAddr: strings.ToLower(listenAddr),
backendProto: strings.ToLower(backendProto),
backendAddr: strings.ToLower(backendAddr),
verbose: false,
}
}
// NewRProxy creates an RProxy instance.
func NewRProxy(listenProto, listenAddr, backendProto, backendAddr, rootCert, serverCert, serverKey, clientCert, clientKey, serverName string) *RProxy {
return &RProxy{
listenProto: strings.ToLower(listenProto),
listenAddr: strings.ToLower(listenAddr),
backendProto: strings.ToLower(backendProto),
backendAddr: strings.ToLower(backendAddr),
rootCert: rootCert,
serverCert: serverCert,
serverKey: serverKey,
clientCert: clientCert,
clientKey: clientKey,
serverName: serverName,
verbose: false,
}
}
// SetVerbose sets the verbose mode, which prints all the data sent and received.
func (rp *RProxy) SetVerbose(v bool) {
rp.verbose = v
}
// SetClientConfig sets the config for client (backend TLS).
func (rp *RProxy) SetClientConfig(config *tls.Config) {
rp.clientConfig = config
}
// SetServerConfig sets the config for server (listen TLS).
func (rp *RProxy) SetServerConfig(config *tls.Config) {
rp.serverConfig = config
}
// Start starts the reverse proxy service.
func (rp *RProxy) Start() error {
// Check backend protocol and load certificates if TLS
switch rp.backendProto {
case "tcp":
case "tls":
// Load client certificates for TLS
if rp.clientConfig == nil {
config, err := certs.LoadClientCerts(rp.rootCert, rp.clientCert, rp.clientKey, rp.serverName)
if err != nil {
return err
}
rp.clientConfig = config
}
default:
return errors.New("backend protocol not supported")
}
// Check listen protocol, load certiticates if TLS, and start listening
switch rp.listenProto {
case "tcp":
return rp.startTCP()
case "tls":
// Load server certificates for TLS
if rp.serverConfig == nil {
config, err := certs.LoadServerCerts(rp.rootCert, rp.serverCert, rp.serverKey)
if err != nil {
return err
}
rp.serverConfig = config
}
// Start listening through TLS protocol
return rp.startTLS()
default:
return errors.New("listen protocol not supported")
}
}
func (rp *RProxy) serve(conn net.Conn) error {
switch rp.backendProto {
case "tcp":
return rp.serveTCP(conn)
case "tls":
return rp.serveTLS(conn)
default:
return errors.New("backend protocol not supported")
}
}
func (rp *RProxy) startTCP() error {
// Resolve network address
lAddr, err := net.ResolveTCPAddr("tcp", rp.listenAddr)
if err != nil {
return err
}
// Listen to TCP connections
ln, err := net.ListenTCP("tcp", lAddr)
if err != nil {
return err
}
defer ln.Close()
// Handle connections
for {
conn, err := ln.Accept()
if err != nil {
log.Printf("accept error: %v", err)
continue
}
go func() {
if err := rp.serve(conn); err != nil {
log.Printf("serve error: %v", err)
}
}()
}
}
func (rp *RProxy) startTLS() error {
// Listen to TLS connections
ln, err := tls.Listen("tcp", rp.listenAddr, rp.serverConfig)
if err != nil {
return err
}
defer ln.Close()
// Handle connections
for {
conn, err := ln.Accept()
if err != nil {
log.Printf("accept error (%v)", err)
continue
}
if err := rp.serve(conn); err != nil {
log.Printf("serve error: %v", err)
}
}
}
func (rp *RProxy) serveTCP(listenConn net.Conn) error {
// Dial to the backend server
backendConn, err := net.DialTimeout("tcp", rp.backendAddr, 30*time.Second)
if err != nil {
listenConn.Close()
return err
}
// Copy network traffic from the listen connection to backend connection
go func() {
io.Copy(NewRPWriteCloser(backendConn), NewRPReader(listenConn, rp.verbose))
backendConn.Close()
listenConn.Close()
}()
// Copy network traffic from the backend connection to listen connection
io.Copy(NewRPWriteCloser(listenConn), NewRPReader(backendConn, rp.verbose))
backendConn.Close()
listenConn.Close()
return nil
}
func (rp *RProxy) serveTLS(listenConn net.Conn) error {
// Dial to the beckend server
backendConn, err := tls.Dial("tcp", rp.backendAddr, rp.clientConfig)
if err != nil {
listenConn.Close()
return err
}
// Copy network traffic from the listen connection to backend connection
go func() {
io.Copy(NewRPWriteCloser(backendConn), NewRPReader(listenConn, rp.verbose))
backendConn.Close()
listenConn.Close()
}()
// Copy network traffic from the backend connection to listen connection
io.Copy(NewRPWriteCloser(listenConn), NewRPReader(backendConn, rp.verbose))
backendConn.Close()
listenConn.Close()
return nil
}