frp/pkg/plugin/client/https2http.go

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// Copyright 2019 fatedier, fatedier@gmail.com
//
// 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.
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//go:build !frps
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package plugin
import (
"crypto/tls"
"fmt"
"io"
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"net"
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"net/http"
"net/http/httputil"
v1 "github.com/fatedier/frp/pkg/config/v1"
"github.com/fatedier/frp/pkg/transport"
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utilnet "github.com/fatedier/frp/pkg/util/net"
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)
func init() {
Register(v1.PluginHTTPS2HTTP, NewHTTPS2HTTPPlugin)
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}
type HTTPS2HTTPPlugin struct {
opts *v1.HTTPS2HTTPPluginOptions
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l *Listener
s *http.Server
}
func NewHTTPS2HTTPPlugin(options v1.ClientPluginOptions) (Plugin, error) {
opts := options.(*v1.HTTPS2HTTPPluginOptions)
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listener := NewProxyListener()
p := &HTTPS2HTTPPlugin{
opts: opts,
l: listener,
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}
rp := &httputil.ReverseProxy{
Director: func(req *http.Request) {
req.URL.Scheme = "http"
req.URL.Host = p.opts.LocalAddr
if p.opts.HostHeaderRewrite != "" {
req.Host = p.opts.HostHeaderRewrite
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}
for k, v := range p.opts.RequestHeaders.Set {
req.Header.Set(k, v)
}
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},
}
p.s = &http.Server{
Handler: rp,
}
var (
tlsConfig *tls.Config
err error
)
if opts.CrtPath != "" || opts.KeyPath != "" {
tlsConfig, err = p.genTLSConfig()
} else {
tlsConfig, err = transport.NewServerTLSConfig("", "", "")
tlsConfig.InsecureSkipVerify = true
}
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if err != nil {
return nil, fmt.Errorf("gen TLS config error: %v", err)
}
ln := tls.NewListener(listener, tlsConfig)
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go func() {
_ = p.s.Serve(ln)
}()
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return p, nil
}
func (p *HTTPS2HTTPPlugin) genTLSConfig() (*tls.Config, error) {
cert, err := tls.LoadX509KeyPair(p.opts.CrtPath, p.opts.KeyPath)
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if err != nil {
return nil, err
}
config := &tls.Config{Certificates: []tls.Certificate{cert}}
return config, nil
}
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func (p *HTTPS2HTTPPlugin) Handle(conn io.ReadWriteCloser, realConn net.Conn, _ *ExtraInfo) {
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wrapConn := utilnet.WrapReadWriteCloserToConn(conn, realConn)
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_ = p.l.PutConn(wrapConn)
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}
func (p *HTTPS2HTTPPlugin) Name() string {
return v1.PluginHTTPS2HTTP
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}
func (p *HTTPS2HTTPPlugin) Close() error {
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return p.s.Close()
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}