Add http2http plugin

Adds support for a new "http2http" plugin in the configuration and implementation.

- Introduces a new constant `PluginHTTP2HTTP` to represent the "http2http" plugin in the plugin configuration.
- Adds `HTTP2HTTPPluginOptions` struct to define the options available for the "http2http" plugin, including local address binding, host header rewrite, and custom request headers.
- Implements the `http2http` plugin in `http2http.go`, which includes the setup of a reverse proxy server that forwards HTTP requests to another HTTP server based on the specified plugin options.
- Registers the "http2http" plugin with the plugin system, allowing it to be utilized in client configurations.


---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/fatedier/frp/pull/4275?shareId=a866fdb3-e40a-4d40-9326-546dc4efce63).

README.md

@@ -11,11 +11,17 @@
 <!--gold sponsors start-->
 <p align="center">
   <a href="https://workos.com/?utm_campaign=github_repo&utm_medium=referral&utm_content=frp&utm_source=github" target="_blank">
-    <img width="350px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_workos.png">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_workos.png">
   </a>
-  <a>&nbsp</a>
+</p>
+<p align="center">
   <a href="https://github.com/daytonaio/daytona" target="_blank">
-    <img width="360px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_daytona.png">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_daytona.png">
+  </a>
+</p>
+<p align="center">
+  <a href="https://github.com/beclab/terminus" target="_blank">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_terminusos.jpeg">
   </a>
 </p>
 <!--gold sponsors end-->

README_zh.md

@@ -13,11 +13,17 @@ frp 是一个专注于内网穿透的高性能的反向代理应用，支持 TCP
 <!--gold sponsors start-->
 <p align="center">
   <a href="https://workos.com/?utm_campaign=github_repo&utm_medium=referral&utm_content=frp&utm_source=github" target="_blank">
-    <img width="350px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_workos.png">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_workos.png">
   </a>
-  <a>&nbsp</a>
+</p>
+<p align="center">
   <a href="https://github.com/daytonaio/daytona" target="_blank">
-    <img width="360px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_daytona.png">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_daytona.png">
+  </a>
+</p>
+<p align="center">
+  <a href="https://github.com/beclab/terminus" target="_blank">
+    <img width="420px" src="https://raw.githubusercontent.com/fatedier/frp/dev/doc/pic/sponsor_terminusos.jpeg">
   </a>
 </p>
 <!--gold sponsors end-->

Release.md

@@ -1,9 +1,3 @@
-### Fixes
+### Features
 
-* Fixed an issue where HTTP/2 was not enabled for https2http and https2https plugins.
-* Fixed the issue where the default values of INI configuration parameters are inconsistent with other configuration formats.
-
-### Changes
-
-* Updated the default value of `transport.tcpMuxKeepaliveInterval` from 60 to 30.
-* On the Android platform, the Google DNS server is used only when the default DNS server cannot be obtained.
+* Added a new plugin "http2http" which allows forwarding HTTP requests to another HTTP server, supporting options like local address binding, host header rewrite, and custom request headers.

pkg/config/v1/plugin.go

@@ -76,6 +76,7 @@ const (
 	PluginSocks5           = "socks5"
 	PluginStaticFile       = "static_file"
 	PluginUnixDomainSocket = "unix_domain_socket"
+	PluginHTTP2HTTP        = "http2http"
 )
 
 var clientPluginOptionsTypeMap = map[string]reflect.Type{
@@ -86,6 +87,7 @@ var clientPluginOptionsTypeMap = map[string]reflect.Type{
 	PluginSocks5:           reflect.TypeOf(Socks5PluginOptions{}),
 	PluginStaticFile:       reflect.TypeOf(StaticFilePluginOptions{}),
 	PluginUnixDomainSocket: reflect.TypeOf(UnixDomainSocketPluginOptions{}),
+	PluginHTTP2HTTP:        reflect.TypeOf(HTTP2HTTPPluginOptions{}),
 }
 
 type HTTP2HTTPSPluginOptions struct {
@@ -137,3 +139,11 @@ type UnixDomainSocketPluginOptions struct {
 	Type     string `json:"type,omitempty"`
 	UnixPath string `json:"unixPath,omitempty"`
 }
+
+// Added HTTP2HTTPPluginOptions struct
+type HTTP2HTTPPluginOptions struct {
+	Type              string           `json:"type,omitempty"`
+	LocalAddr         string           `json:"localAddr,omitempty"`
+	HostHeaderRewrite string           `json:"hostHeaderRewrite,omitempty"`
+	RequestHeaders    HeaderOperations `json:"requestHeaders,omitempty"`
+}

pkg/plugin/client/http2http.go

@@ -0,0 +1,91 @@
+// Copyright 2024 The frp Authors
+//
+// 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.
+
+package plugin
+
+import (
+	"io"
+	stdlog "log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+
+	"github.com/fatedier/golib/pool"
+
+	v1 "github.com/fatedier/frp/pkg/config/v1"
+	"github.com/fatedier/frp/pkg/util/log"
+	netpkg "github.com/fatedier/frp/pkg/util/net"
+)
+
+func init() {
+	Register(v1.PluginHTTP2HTTP, NewHTTP2HTTPPlugin)
+}
+
+type HTTP2HTTPPlugin struct {
+	opts *v1.HTTP2HTTPPluginOptions
+
+	l *Listener
+	s *http.Server
+}
+
+func NewHTTP2HTTPPlugin(options v1.ClientPluginOptions) (Plugin, error) {
+	opts := options.(*v1.HTTP2HTTPPluginOptions)
+
+	listener := NewProxyListener()
+
+	p := &HTTP2HTTPPlugin{
+		opts: opts,
+		l:    listener,
+	}
+
+	rp := &httputil.ReverseProxy{
+		Rewrite: func(r *httputil.ProxyRequest) {
+			req := r.Out
+			req.URL.Scheme = "http"
+			req.URL.Host = p.opts.LocalAddr
+			if p.opts.HostHeaderRewrite != "" {
+				req.Host = p.opts.HostHeaderRewrite
+			}
+			for k, v := range p.opts.RequestHeaders.Set {
+				req.Header.Set(k, v)
+			}
+		},
+		BufferPool: pool.NewBuffer(32 * 1024),
+		ErrorLog:   stdlog.New(log.NewWriteLogger(log.WarnLevel, 2), "", 0),
+	}
+
+	p.s = &http.Server{
+		Handler:           rp,
+		ReadHeaderTimeout: 0,
+	}
+
+	go func() {
+		_ = p.s.Serve(listener)
+	}()
+
+	return p, nil
+}
+
+func (p *HTTP2HTTPPlugin) Handle(conn io.ReadWriteCloser, realConn net.Conn, _ *ExtraInfo) {
+	wrapConn := netpkg.WrapReadWriteCloserToConn(conn, realConn)
+	_ = p.l.PutConn(wrapConn)
+}
+
+func (p *HTTP2HTTPPlugin) Name() string {
+	return v1.PluginHTTP2HTTP
+}
+
+func (p *HTTP2HTTPPlugin) Close() error {
+	return p.s.Close()
+}