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117 lines
2.5 KiB
Go
117 lines
2.5 KiB
Go
package builtin
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import (
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"bufio"
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"io"
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"net"
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"net/http"
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"strings"
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"github.com/gotunnel/pkg/plugin"
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)
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// HTTPPlugin 将现有 HTTP 代理实现封装为 plugin
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type HTTPPlugin struct {
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config map[string]string
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}
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// NewHTTPPlugin 创建 HTTP plugin
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func NewHTTPPlugin() *HTTPPlugin {
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return &HTTPPlugin{}
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}
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// Metadata 返回 plugin 信息
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func (p *HTTPPlugin) Metadata() plugin.PluginMetadata {
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return plugin.PluginMetadata{
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Name: "http",
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Version: "1.0.0",
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Type: plugin.PluginTypeProxy,
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Source: plugin.PluginSourceBuiltin,
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Description: "HTTP/HTTPS proxy protocol handler",
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Author: "GoTunnel",
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Capabilities: []string{
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"dial", "read", "write", "close",
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},
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}
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}
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// Init 初始化 plugin
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func (p *HTTPPlugin) Init(config map[string]string) error {
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p.config = config
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return nil
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}
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// HandleConn 处理 HTTP 代理连接
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func (p *HTTPPlugin) HandleConn(conn net.Conn, dialer plugin.Dialer) error {
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defer conn.Close()
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reader := bufio.NewReader(conn)
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req, err := http.ReadRequest(reader)
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if err != nil {
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return err
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}
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if req.Method == http.MethodConnect {
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return p.handleConnect(conn, req, dialer)
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}
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return p.handleHTTP(conn, req, dialer)
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}
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// Close 释放资源
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func (p *HTTPPlugin) Close() error {
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return nil
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}
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// handleConnect 处理 CONNECT 方法 (HTTPS)
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func (p *HTTPPlugin) handleConnect(conn net.Conn, req *http.Request, dialer plugin.Dialer) error {
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target := req.Host
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if !strings.Contains(target, ":") {
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target = target + ":443"
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}
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remote, err := dialer.Dial("tcp", target)
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if err != nil {
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conn.Write([]byte("HTTP/1.1 502 Bad Gateway\r\n\r\n"))
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return err
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}
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defer remote.Close()
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conn.Write([]byte("HTTP/1.1 200 Connection Established\r\n\r\n"))
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go io.Copy(remote, conn)
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io.Copy(conn, remote)
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return nil
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}
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// handleHTTP 处理普通 HTTP 请求
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func (p *HTTPPlugin) handleHTTP(conn net.Conn, req *http.Request, dialer plugin.Dialer) error {
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target := req.Host
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if !strings.Contains(target, ":") {
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target = target + ":80"
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}
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remote, err := dialer.Dial("tcp", target)
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if err != nil {
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conn.Write([]byte("HTTP/1.1 502 Bad Gateway\r\n\r\n"))
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return err
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}
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defer remote.Close()
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// 修改请求路径为相对路径
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req.URL.Scheme = ""
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req.URL.Host = ""
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req.RequestURI = req.URL.Path
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if req.URL.RawQuery != "" {
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req.RequestURI += "?" + req.URL.RawQuery
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}
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// 发送请求到目标
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if err := req.Write(remote); err != nil {
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return err
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}
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// 转发响应
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_, err = io.Copy(conn, remote)
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return err
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}
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