func getRequest(conn *connection.Conn, auth bool, timeout time.Duration) (host string, ota bool, err error) { glog.V(5).Infoln("getRequest from remote34342") connection.SetReadTimeout(conn, timeout) // buf size should at least have the same size with the largest possible // request size (when addrType is 3, domain name has at most 256 bytes) // 1(addrType) + 1(lenByte) + 256(max length address) + 2(port) + 10(hmac-sha1) buf := make([]byte, 270) // read till we get possible domain length field if _, err = io.ReadFull(conn, buf[:idType+1]); err != nil { glog.Errorln("read buffer from remote connection error:", err) return } // if _, err = io.ReadFull(conn, buf[:64]); err != nil { // glog.Errorln("read buffer from remote connection error:", err) // return // } // glog.V(5).Infof("Got a Request string is byte:%v string:%v)\r\n", buf, string(buf)) // return var reqStart, reqEnd int addrType := buf[idType] switch addrType & connection.AddrMask { case typeIPv4: reqStart, reqEnd = idIP0, idIP0+lenIPv4 case typeIPv6: reqStart, reqEnd = idIP0, idIP0+lenIPv6 case typeDm: glog.V(5).Infoln("Got a Domain Addr Type, read start(%v) end(%v)\r\n", idType+1, idDmLen+1) if _, err = io.ReadFull(conn, buf[idType+1:idDmLen+1]); err != nil { glog.Errorf("Read from remote err:%v\r\n", err) return } reqStart, reqEnd = idDm0, int(idDm0+buf[idDmLen]+lenDmBase) default: err = fmt.Errorf("addr type %d not supported", addrType&connection.AddrMask) return } if _, err = io.ReadFull(conn, buf[reqStart:reqEnd]); err != nil { return } glog.V(5).Infof("Got string from remote %v \r\n", buf[reqStart:reqEnd]) // Return string for typeIP is not most efficient, but browsers (Chrome, // Safari, Firefox) all seems using typeDm exclusively. So this is not a // big problem. switch addrType & connection.AddrMask { case typeIPv4: host = net.IP(buf[idIP0 : idIP0+net.IPv4len]).String() case typeIPv6: host = net.IP(buf[idIP0 : idIP0+net.IPv6len]).String() case typeDm: host = string(buf[idDm0 : idDm0+buf[idDmLen]]) } glog.V(5).Infof("Got host from remote: %v\r\n", host) // parse port port := binary.BigEndian.Uint16(buf[reqEnd-2 : reqEnd]) host = net.JoinHostPort(host, strconv.Itoa(int(port))) // if specified one time auth enabled, we should verify this if auth || addrType&connection.OneTimeAuthMask > 0 { ota = true if _, err = io.ReadFull(conn, buf[reqEnd:reqEnd+lenHmacSha1]); err != nil { return } iv := conn.GetIv() key := conn.GetKey() actualHmacSha1Buf := util.HmacSha1(append(iv, key...), buf[:reqEnd]) if !bytes.Equal(buf[reqEnd:reqEnd+lenHmacSha1], actualHmacSha1Buf) { err = fmt.Errorf("verify one time auth failed, iv=%v key=%v data=%v", iv, key, buf[:reqEnd]) return } } return }