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| package main | |
| import ( | |
| "bytes" | |
| "fmt" | |
| "log" | |
| "net" | |
| ) | |
| var buff = make([]byte, 1000, 1000) | |
| func main() { | |
| log.SetFlags(log.LstdFlags | log.Lshortfile) | |
| l, err := net.Listen("tcp", ":8081") | |
| if err != nil { | |
| log.Panic(err) | |
| } | |
| for { | |
| client, err := l.Accept() | |
| if err != nil { | |
| log.Panic(err) | |
| } | |
| go handleClientRequest(client) | |
| } | |
| } | |
| func handleClientRequest(client net.Conn) { | |
| if client == nil { | |
| return | |
| } | |
| defer client.Close() | |
| buff = buff[:0] | |
| buff = buff[:cap(buff)] | |
| c, err := client.Read(buff) | |
| if err != nil { | |
| log.Println(err) | |
| } | |
| log.Printf("%s", buff) | |
| var method, host, protocol string | |
| fmt.Sscanf(string(buff[:bytes.IndexByte(buff, '\n')]), "%s %s %s", &method, &host, &protocol) | |
| //获得了请求的host和port，就开始拨号吧 | |
| server, err := net.Dial("tcp", host) | |
| if err != nil { | |
| log.Println(err) | |
| } | |
| if method == "CONNECT" { | |
| fmt.Fprint(client, "HTTP/1.1 200 Connection established\r\n\r\n") | |
| } else { | |
| server.Write(buff[:c]) | |
| } | |
| //进行转发 | |
| go io.Copy(server, client) | |
| io.Copy(client, server) | |
| } |
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