HandleRegexp 通过正则检测首包选出目标，再转发后续数据流。
(conn net.Conn, rule *config.Rule)
| 13 | |
| 14 | // HandleRegexp 通过正则检测首包选出目标，再转发后续数据流。 |
| 15 | func HandleRegexp(conn net.Conn, rule *config.Rule) { |
| 16 | defer conn.Close() |
| 17 | |
| 18 | //正则模式下需要客户端的第一个数据包判断特征，所以需要设置一个超时 |
| 19 | conn.SetReadDeadline(time.Now().Add(time.Millisecond * time.Duration(rule.Timeout))) |
| 20 | //获取第一个数据包 |
| 21 | firstPacket := new(bytes.Buffer) |
| 22 | if _, err := io.CopyN(firstPacket, conn, 4096); err != nil { |
| 23 | utils.Logger.Error("无法处理连接，读取首包失败", |
| 24 | zap.String("ruleName", rule.Name), |
| 25 | zap.String("remoteAddr", conn.RemoteAddr().String()), |
| 26 | zap.Error(err)) |
| 27 | return |
| 28 | } |
| 29 | |
| 30 | var target net.Conn |
| 31 | //挨个匹配正则 |
| 32 | for _, v := range rule.Targets { |
| 33 | if !v.Re.Match(firstPacket.Bytes()) { |
| 34 | continue |
| 35 | } |
| 36 | c, err := outboundDial(v.Address) |
| 37 | if err != nil { |
| 38 | utils.Logger.Error("无法建立连接", |
| 39 | zap.String("ruleName", rule.Name), |
| 40 | zap.String("remoteAddr", conn.RemoteAddr().String()), |
| 41 | zap.String("targetAddr", v.Address)) |
| 42 | continue |
| 43 | } |
| 44 | if tc, ok := c.(*net.TCPConn); ok { |
| 45 | _ = tc.SetNoDelay(true) |
| 46 | _ = tc.SetKeepAlive(true) |
| 47 | _ = tc.SetKeepAlivePeriod(30 * time.Second) |
| 48 | } |
| 49 | target = c |
| 50 | break |
| 51 | } |
| 52 | if target == nil { |
| 53 | utils.Logger.Error("未匹配到任何目标，无法处理连接", |
| 54 | zap.String("ruleName", rule.Name), |
| 55 | zap.String("remoteAddr", conn.RemoteAddr().String())) |
| 56 | return |
| 57 | } |
| 58 | |
| 59 | utils.Logger.Debug("建立连接", |
| 60 | zap.String("ruleName", rule.Name), |
| 61 | zap.String("remoteAddr", conn.RemoteAddr().String()), |
| 62 | zap.String("targetAddr", target.RemoteAddr().String())) |
| 63 | //匹配到了，去除掉刚才设定的超时 |
| 64 | conn.SetReadDeadline(time.Time{}) |
| 65 | //把第一个数据包发送给目标 |
| 66 | io.Copy(target, firstPacket) |
| 67 | |
| 68 | defer target.Close() |
| 69 | |
| 70 | go func() { |
| 71 | io.Copy(conn, target) |
| 72 | conn.Close() |
no test coverage detected