f1038a132b
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89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package proxy
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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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)
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// HTTPServer HTTP 代理服务
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type HTTPServer struct {
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dialer Dialer
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}
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// NewHTTPServer 创建 HTTP 代理服务
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func NewHTTPServer(dialer Dialer) *HTTPServer {
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return &HTTPServer{dialer: dialer}
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}
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// HandleConn 处理 HTTP 代理连接
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func (h *HTTPServer) HandleConn(conn net.Conn) 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 h.handleConnect(conn, req)
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}
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return h.handleHTTP(conn, req, reader)
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}
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// handleConnect 处理 CONNECT 方法 (HTTPS)
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func (h *HTTPServer) handleConnect(conn net.Conn, req *http.Request) 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 := h.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 (h *HTTPServer) handleHTTP(conn net.Conn, req *http.Request, reader *bufio.Reader) 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 := h.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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