diff --git a/client/_c2c_decoders.go b/client/_c2c_decoders.go
index 72a72b44..e6d2e7e3 100644
--- a/client/_c2c_decoders.go
+++ b/client/_c2c_decoders.go
@@ -1,8 +1,11 @@
 package client
 
-import "github.com/Mrs4s/MiraiGo/client/pb/msg"
+import (
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
+	"github.com/Mrs4s/MiraiGo/client/pb/msg"
+)
 
-var privateMsgDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacketInfo){
+var privateMsgDecoders = map[int32]func(*QQClient, *msg.Message, *network.IncomingPacketInfo){
 	9: privateMessageDecoder, 10: privateMessageDecoder, 31: privateMessageDecoder,
 	79: privateMessageDecoder, 97: privateMessageDecoder, 120: privateMessageDecoder,
 	132: privateMessageDecoder, 133: privateMessageDecoder, 166: privateMessageDecoder,
@@ -10,21 +13,21 @@ var privateMsgDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacket
 	208: privatePttDecoder,
 }
 
-var nonSvcNotifyTroopSystemMsgDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacketInfo){
+var nonSvcNotifyTroopSystemMsgDecoders = map[int32]func(*QQClient, *msg.Message, *network.IncomingPacketInfo){
 	36: troopSystemMessageDecoder, 85: troopSystemMessageDecoder,
 }
 
-var troopSystemMsgDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacketInfo){
+var troopSystemMsgDecoders = map[int32]func(*QQClient, *msg.Message, *network.IncomingPacketInfo){
 	35: troopSystemMessageDecoder, 37: troopSystemMessageDecoder,
 	45: troopSystemMessageDecoder, 46: troopSystemMessageDecoder, 84: troopSystemMessageDecoder,
 	86: troopSystemMessageDecoder, 87: troopSystemMessageDecoder,
 } // IsSvcNotify
 
-var sysMsgDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacketInfo){
+var sysMsgDecoders = map[int32]func(*QQClient, *msg.Message, *network.IncomingPacketInfo){
 	187: systemMessageDecoder, 188: systemMessageDecoder, 189: systemMessageDecoder,
 	190: systemMessageDecoder, 191: systemMessageDecoder,
 } // IsSvcNotify
 
-var otherDecoders = map[int32]func(*QQClient, *msg.Message, *incomingPacketInfo){
+var otherDecoders = map[int32]func(*QQClient, *msg.Message, *network.IncomingPacketInfo){
 	33: troopAddMemberBroadcastDecoder, 529: msgType0x211Decoder,
 }
diff --git a/client/builders.go b/client/builders.go
index 4ca6d771..ebb530e7 100644
--- a/client/builders.go
+++ b/client/builders.go
@@ -1070,7 +1070,7 @@ func (c *QQClient) buildAppInfoRequestPacket(id string) (uint16, []byte) {
 	body := &qweb.QWebReq{
 		Seq:        proto.Int64(1),
 		Qua:        proto.String("V1_AND_SQ_8.4.8_1492_YYB_D"),
-		Device: proto.String(c.getWebDeviceInfo()),
+		device: proto.String(c.getWebDeviceInfo()),
 		BusiBuff:   b,
 		TraceId:    proto.String(fmt.Sprintf("%v_%v_%v", c.Uin, time.Now().Format("0102150405"), rand.Int63())),
 	}
diff --git a/client/c2c_processor.go b/client/c2c_processor.go
index 652b7df6..beec05ca 100644
--- a/client/c2c_processor.go
+++ b/client/c2c_processor.go
@@ -9,6 +9,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
@@ -27,18 +28,18 @@ type (
 )
 
 const (
-	GroupSource         TempSessionSource = 0 // 来自群聊
-	ConsultingSource    TempSessionSource = 1 // 来自QQ咨询
-	SearchSource        TempSessionSource = 2 // 来自查找
-	MovieSource         TempSessionSource = 3 // 来自QQ电影
-	HotChatSource       TempSessionSource = 4 // 来自热聊
-	SystemMessageSource TempSessionSource = 6 // 来自验证消息
-	MultiChatSource     TempSessionSource = 7 // 来自多人聊天
-	DateSource          TempSessionSource = 8 // 来自约会
-	AddressBookSource   TempSessionSource = 9 // 来自通讯录
+	GroupSource         TempSessionSource = iota // 来自群聊
+	ConsultingSource                             // 来自QQ咨询
+	SearchSource                                 // 来自查找
+	MovieSource                                  // 来自QQ电影
+	HotChatSource                                // 来自热聊
+	SystemMessageSource                          // 来自验证消息
+	MultiChatSource                              // 来自多人聊天
+	DateSource                                   // 来自约会
+	AddressBookSource                            // 来自通讯录
 )
 
-func (c *QQClient) c2cMessageSyncProcessor(rsp *msg.GetMessageResponse, info *incomingPacketInfo) {
+func (c *QQClient) c2cMessageSyncProcessor(rsp *msg.GetMessageResponse, info *network.IncomingPacketInfo) {
 	c.syncCookie = rsp.SyncCookie
 	c.pubAccountCookie = rsp.PubAccountCookie
 	// c.msgCtrlBuf = rsp.MsgCtrlBuf
@@ -76,7 +77,7 @@ func (c *QQClient) c2cMessageSyncProcessor(rsp *msg.GetMessageResponse, info *in
 	}
 }
 
-func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *incomingPacketInfo) {
+func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *network.IncomingPacketInfo) {
 	strKey := fmt.Sprintf("%d%d%d%d", pMsg.Head.GetFromUin(), pMsg.Head.GetToUin(), pMsg.Head.GetMsgSeq(), pMsg.Head.GetMsgUid())
 	if _, ok := c.msgSvcCache.GetAndUpdate(strKey, time.Hour); ok {
 		c.Debug("c2c msg %v already exists in cache. skip.", pMsg.Head.GetMsgUid())
@@ -88,7 +89,7 @@ func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *incomingPacketInfo)
 		return
 	}
 	c.lastC2CMsgTime = int64(pMsg.Head.GetMsgTime())
-	if info.Params.bool("init") {
+	if info.Params.Bool("init") {
 		return
 	}
 	if decoder, _ := peekC2CDecoder(pMsg.Head.GetMsgType()); decoder != nil {
@@ -98,7 +99,7 @@ func (c *QQClient) commMsgProcessor(pMsg *msg.Message, info *incomingPacketInfo)
 	}
 }
 
-func privateMessageDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
+func privateMessageDecoder(c *QQClient, pMsg *msg.Message, _ *network.IncomingPacketInfo) {
 	switch pMsg.Head.GetC2CCmd() {
 	case 11, 175: // friend msg
 		if pMsg.Head.GetFromUin() == c.Uin {
@@ -126,7 +127,7 @@ func privateMessageDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo
 	}
 }
 
-func privatePttDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
+func privatePttDecoder(c *QQClient, pMsg *msg.Message, _ *network.IncomingPacketInfo) {
 	if pMsg.Body == nil || pMsg.Body.RichText == nil || pMsg.Body.RichText.Ptt == nil {
 		return
 	}
@@ -137,7 +138,7 @@ func privatePttDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
 	c.dispatchPrivateMessage(c.parsePrivateMessage(pMsg))
 }
 
-func tempSessionDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
+func tempSessionDecoder(c *QQClient, pMsg *msg.Message, _ *network.IncomingPacketInfo) {
 	if pMsg.Head.C2CTmpMsgHead == nil || pMsg.Body == nil {
 		return
 	}
@@ -198,7 +199,7 @@ func tempSessionDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
 	}
 }
 
-func troopAddMemberBroadcastDecoder(c *QQClient, pMsg *msg.Message, _ *incomingPacketInfo) {
+func troopAddMemberBroadcastDecoder(c *QQClient, pMsg *msg.Message, _ *network.IncomingPacketInfo) {
 	groupJoinLock.Lock()
 	defer groupJoinLock.Unlock()
 	group := c.FindGroupByUin(pMsg.Head.GetFromUin())
@@ -225,13 +226,13 @@ func troopAddMemberBroadcastDecoder(c *QQClient, pMsg *msg.Message, _ *incomingP
 	}
 }
 
-func systemMessageDecoder(c *QQClient, _ *msg.Message, _ *incomingPacketInfo) {
+func systemMessageDecoder(c *QQClient, _ *msg.Message, _ *network.IncomingPacketInfo) {
 	_, pkt := c.buildSystemMsgNewFriendPacket()
 	_ = c.sendPacket(pkt)
 }
 
-func troopSystemMessageDecoder(c *QQClient, pMsg *msg.Message, info *incomingPacketInfo) {
-	if !info.Params.bool("used_reg_proxy") && pMsg.Head.GetMsgType() != 85 && pMsg.Head.GetMsgType() != 36 {
+func troopSystemMessageDecoder(c *QQClient, pMsg *msg.Message, info *network.IncomingPacketInfo) {
+	if !info.Params.Bool("used_reg_proxy") && pMsg.Head.GetMsgType() != 85 && pMsg.Head.GetMsgType() != 36 {
 		c.exceptAndDispatchGroupSysMsg()
 	}
 	if len(pMsg.Body.GetMsgContent()) == 0 {
@@ -245,7 +246,7 @@ func troopSystemMessageDecoder(c *QQClient, pMsg *msg.Message, info *incomingPac
 	}
 }
 
-func msgType0x211Decoder(c *QQClient, pMsg *msg.Message, info *incomingPacketInfo) {
+func msgType0x211Decoder(c *QQClient, pMsg *msg.Message, info *network.IncomingPacketInfo) {
 	if pMsg.Head.GetC2CCmd() == 6 || pMsg.Head.C2CTmpMsgHead != nil {
 		tempSessionDecoder(c, pMsg, info)
 	}
diff --git a/client/c2c_switch.go b/client/c2c_switch.go
index de8f735f..160e4005 100644
--- a/client/c2c_switch.go
+++ b/client/c2c_switch.go
@@ -3,6 +3,7 @@
 package client
 
 import (
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 )
 
@@ -15,7 +16,7 @@ const (
 	troopSystemMsgDecoders
 )
 
-func peekC2CDecoder(msgType int32) (decoder func(*QQClient, *msg.Message, *incomingPacketInfo), decoderType uint8) {
+func peekC2CDecoder(msgType int32) (decoder func(*QQClient, *msg.Message, *network.IncomingPacketInfo), decoderType uint8) {
 	switch msgType {
 	case 9:
 		return privateMessageDecoder, privateMsgDecoders
diff --git a/client/client.go b/client/client.go
index c4786c7f..652054c9 100644
--- a/client/client.go
+++ b/client/client.go
@@ -17,6 +17,7 @@ import (
 	"github.com/Mrs4s/MiraiGo/binary/jce"
 	"github.com/Mrs4s/MiraiGo/client/internal/auth"
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/internal/crypto"
 	"github.com/Mrs4s/MiraiGo/internal/packets"
@@ -50,7 +51,7 @@ type QQClient struct {
 	SequenceId              atomic.Int32
 	OutGoingPacketSessionId []byte
 	RandomKey               []byte
-	TCP                     *utils.TCPListener
+	TCP                     *network.TCPListener // todo: combine other protocol state into one struct
 	ConnectTime             time.Time
 
 	// internal state
@@ -123,17 +124,17 @@ type QiDianAccountInfo struct {
 type handlerInfo struct {
 	fun     func(i interface{}, err error)
 	dynamic bool
-	params  requestParams
+	params  network.RequestParams
 }
 
-func (h *handlerInfo) getParams() requestParams {
+func (h *handlerInfo) getParams() network.RequestParams {
 	if h == nil {
 		return nil
 	}
 	return h.params
 }
 
-var decoders = map[string]func(*QQClient, *incomingPacketInfo, []byte) (interface{}, error){
+var decoders = map[string]func(*QQClient, *network.IncomingPacketInfo, []byte) (interface{}, error){
 	"wtlogin.login":                                decodeLoginResponse,
 	"wtlogin.exchange_emp":                         decodeExchangeEmpResponse,
 	"wtlogin.trans_emp":                            decodeTransEmpResponse,
@@ -180,7 +181,7 @@ func NewClientMd5(uin int64, passwordMd5 [16]byte) *QQClient {
 		AllowSlider:             true,
 		RandomKey:               make([]byte, 16),
 		OutGoingPacketSessionId: []byte{0x02, 0xB0, 0x5B, 0x8B},
-		TCP:                     &utils.TCPListener{},
+		TCP:                     &network.TCPListener{},
 		sigInfo:                 &auth.SigInfo{},
 		eventHandlers:           &eventHandlers{},
 		msgSvcCache:             utils.NewCache(time.Second * 15),
@@ -440,7 +441,7 @@ func (c *QQClient) init(tokenLogin bool) error {
 		_, _ = c.sendAndWait(c.buildConnKeyRequestPacket()) // big data key 如果等待 config push 的话时间来不及
 	}
 	seq, pkt := c.buildGetMessageRequestPacket(msg.SyncFlag_START, time.Now().Unix())
-	_, _ = c.sendAndWait(seq, pkt, requestParams{"used_reg_proxy": true, "init": true})
+	_, _ = c.sendAndWait(seq, pkt, network.RequestParams{"used_reg_proxy": true, "init": true})
 	c.syncChannelFirstView()
 	return nil
 }
@@ -802,7 +803,7 @@ func (c *QQClient) doHeartbeat() {
 		sso := packets.BuildSsoPacket(seq, c.version.AppId, c.version.SubAppId, "Heartbeat.Alive", c.deviceInfo.IMEI, EmptyBytes, c.OutGoingPacketSessionId, EmptyBytes, c.ksid)
 		packet := packets.BuildLoginPacket(c.Uin, 0, EmptyBytes, sso, EmptyBytes)
 		_, err := c.sendAndWait(seq, packet)
-		if errors.Is(err, utils.ErrConnectionClosed) {
+		if errors.Is(err, network.ErrConnectionClosed) {
 			continue
 		}
 		times++
diff --git a/client/decoders.go b/client/decoders.go
index 1daaa082..ee6ea8d6 100644
--- a/client/decoders.go
+++ b/client/decoders.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/binary/jce"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x352"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x6ff"
@@ -31,7 +32,7 @@ var (
 )
 
 // wtlogin.login
-func decodeLoginResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeLoginResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	reader := binary.NewReader(payload)
 	reader.ReadUInt16() // sub command
 	t := reader.ReadByte()
@@ -179,7 +180,7 @@ func decodeLoginResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (in
 }
 
 // StatSvc.register
-func decodeClientRegisterResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeClientRegisterResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -196,7 +197,7 @@ func decodeClientRegisterResponse(c *QQClient, _ *incomingPacketInfo, payload []
 }
 
 // wtlogin.exchange_emp
-func decodeExchangeEmpResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeExchangeEmpResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	reader := binary.NewReader(payload)
 	cmd := reader.ReadUInt16()
 	t := reader.ReadByte()
@@ -216,7 +217,7 @@ func decodeExchangeEmpResponse(c *QQClient, _ *incomingPacketInfo, payload []byt
 }
 
 // wtlogin.trans_emp
-func decodeTransEmpResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeTransEmpResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	if len(payload) < 48 {
 		return nil, errors.New("missing payload length")
 	}
@@ -299,7 +300,7 @@ func decodeTransEmpResponse(c *QQClient, _ *incomingPacketInfo, payload []byte)
 }
 
 // ConfigPushSvc.PushReq
-func decodePushReqPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodePushReqPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -369,7 +370,7 @@ func decodePushReqPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (in
 }
 
 // MessageSvc.PbGetMsg
-func decodeMessageSvcPacket(c *QQClient, info *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMessageSvcPacket(c *QQClient, info *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := msg.GetMessageResponse{}
 	err := proto.Unmarshal(payload, &rsp)
 	if err != nil {
@@ -380,7 +381,7 @@ func decodeMessageSvcPacket(c *QQClient, info *incomingPacketInfo, payload []byt
 }
 
 // MessageSvc.PushNotify
-func decodeSvcNotify(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeSvcNotify(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload[4:]))
 	data := &jce.RequestDataVersion2{}
@@ -407,7 +408,7 @@ func decodeSvcNotify(c *QQClient, _ *incomingPacketInfo, payload []byte) (interf
 }
 
 // SummaryCard.ReqSummaryCard
-func decodeSummaryCardResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeSummaryCardResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -455,7 +456,7 @@ func decodeSummaryCardResponse(_ *QQClient, _ *incomingPacketInfo, payload []byt
 }
 
 // friendlist.getFriendGroupList
-func decodeFriendGroupListResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeFriendGroupListResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion3{}
@@ -480,7 +481,7 @@ func decodeFriendGroupListResponse(_ *QQClient, _ *incomingPacketInfo, payload [
 }
 
 // friendlist.delFriend
-func decodeFriendDeleteResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeFriendDeleteResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion3{}
@@ -493,7 +494,7 @@ func decodeFriendDeleteResponse(_ *QQClient, _ *incomingPacketInfo, payload []by
 }
 
 // friendlist.GetTroopListReqV2
-func decodeGroupListResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupListResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion3{}
@@ -525,7 +526,7 @@ func decodeGroupListResponse(c *QQClient, _ *incomingPacketInfo, payload []byte)
 }
 
 // friendlist.GetTroopMemberListReq
-func decodeGroupMemberListResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupMemberListResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion3{}
@@ -561,7 +562,7 @@ func decodeGroupMemberListResponse(_ *QQClient, _ *incomingPacketInfo, payload [
 }
 
 // group_member_card.get_group_member_card_info
-func decodeGroupMemberInfoResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupMemberInfoResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := pb.GroupMemberRspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -594,7 +595,7 @@ func decodeGroupMemberInfoResponse(c *QQClient, _ *incomingPacketInfo, payload [
 }
 
 // LongConn.OffPicUp
-func decodeOffPicUpResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOffPicUpResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := cmd0x352.RspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -632,7 +633,7 @@ func decodeOffPicUpResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 }
 
 // OnlinePush.PbPushTransMsg
-func decodeOnlinePushTransPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOnlinePushTransPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	info := msg.TransMsgInfo{}
 	err := proto.Unmarshal(payload, &info)
 	if err != nil {
@@ -735,7 +736,7 @@ func decodeOnlinePushTransPacket(c *QQClient, _ *incomingPacketInfo, payload []b
 }
 
 // ProfileService.Pb.ReqSystemMsgNew.Friend
-func decodeSystemMsgFriendPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeSystemMsgFriendPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := structmsg.RspSystemMsgNew{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -757,7 +758,7 @@ func decodeSystemMsgFriendPacket(c *QQClient, _ *incomingPacketInfo, payload []b
 }
 
 // MessageSvc.PushForceOffline
-func decodeForceOfflinePacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeForceOfflinePacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -770,7 +771,7 @@ func decodeForceOfflinePacket(c *QQClient, _ *incomingPacketInfo, payload []byte
 }
 
 // StatSvc.ReqMSFOffline
-func decodeMSFOfflinePacket(c *QQClient, _ *incomingPacketInfo, _ []byte) (interface{}, error) {
+func decodeMSFOfflinePacket(c *QQClient, _ *network.IncomingPacketInfo, _ []byte) (interface{}, error) {
 	// c.lastLostMsg = "服务器端强制下线."
 	c.Disconnect()
 	// 这个decoder不能消耗太多时间, event另起线程处理
@@ -779,7 +780,7 @@ func decodeMSFOfflinePacket(c *QQClient, _ *incomingPacketInfo, _ []byte) (inter
 }
 
 // OidbSvc.0xd79
-func decodeWordSegmentation(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeWordSegmentation(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := &oidb.D79RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -794,7 +795,7 @@ func decodeWordSegmentation(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 	return nil, errors.New("no word received")
 }
 
-func decodeSidExpiredPacket(c *QQClient, i *incomingPacketInfo, _ []byte) (interface{}, error) {
+func decodeSidExpiredPacket(c *QQClient, i *network.IncomingPacketInfo, _ []byte) (interface{}, error) {
 	_, err := c.sendAndWait(c.buildRequestChangeSigPacket(3554528))
 	if err != nil {
 		return nil, errors.Wrap(err, "resign client error")
@@ -824,6 +825,6 @@ func decodeAppInfoResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (
 }
 */
 
-func ignoreDecoder(_ *QQClient, _ *incomingPacketInfo, _ []byte) (interface{}, error) {
+func ignoreDecoder(_ *QQClient, _ *network.IncomingPacketInfo, _ []byte) (interface{}, error) {
 	return nil, nil
 }
diff --git a/client/face.go b/client/face.go
index 674ec9e6..dca3a22f 100644
--- a/client/face.go
+++ b/client/face.go
@@ -5,6 +5,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/faceroam"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -40,7 +41,7 @@ func (c *QQClient) buildFaceroamRequestPacket() (uint16, []byte) {
 	return c.uniPacket("Faceroam.OpReq", payload)
 }
 
-func decodeFaceroamResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeFaceroamResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := faceroam.FaceroamRspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/global.go b/client/global.go
index 391dfe99..13ddcc13 100644
--- a/client/global.go
+++ b/client/global.go
@@ -30,14 +30,6 @@ type (
 	groupMessageBuilder struct {
 		MessageSlices []*msg.Message
 	}
-
-	incomingPacketInfo struct {
-		CommandName string
-		SequenceId  uint16
-		Params      requestParams
-	}
-
-	requestParams map[string]interface{}
 )
 
 var SystemDeviceInfo = &DeviceInfo{
@@ -308,28 +300,6 @@ func genLongTemplate(resID, brief string, ts int64) *message.ServiceElement {
 	}
 }
 
-func (p requestParams) bool(k string) bool {
-	if p == nil {
-		return false
-	}
-	i, ok := p[k]
-	if !ok {
-		return false
-	}
-	return i.(bool)
-}
-
-func (p requestParams) int32(k string) int32 {
-	if p == nil {
-		return 0
-	}
-	i, ok := p[k]
-	if !ok {
-		return 0
-	}
-	return i.(int32)
-}
-
 func (c *QQClient) getWebDeviceInfo() (i string) {
 	qimei := strings.ToLower(utils.RandomString(36))
 	i += fmt.Sprintf("i=%v&imsi=&mac=%v&m=%v&o=%v&", c.deviceInfo.IMEI, utils.B2S(c.deviceInfo.MacAddress), utils.B2S(c.deviceInfo.Device), utils.B2S(c.deviceInfo.Version.Release))
diff --git a/client/group_file.go b/client/group_file.go
index d72d955a..c2799a15 100644
--- a/client/group_file.go
+++ b/client/group_file.go
@@ -12,6 +12,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/exciting"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
@@ -439,7 +440,7 @@ func (c *QQClient) buildGroupFileDeleteReqPacket(groupCode int64, parentFolderId
 	return c.uniPacket("OidbSvc.0x6d6_3", payload)
 }
 
-func decodeOIDB6d81Response(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOIDB6d81Response(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D6D8RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -452,7 +453,7 @@ func decodeOIDB6d81Response(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 }
 
 // OidbSvc.0x6d6_2
-func decodeOIDB6d62Response(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOIDB6d62Response(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D6D6RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -469,7 +470,7 @@ func decodeOIDB6d62Response(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 	return fmt.Sprintf("http://%s/ftn_handler/%s/", ip, url), nil
 }
 
-func decodeOIDB6d63Response(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOIDB6d63Response(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D6D6RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -484,7 +485,7 @@ func decodeOIDB6d63Response(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 	return rsp.DeleteFileRsp.GetClientWording(), nil
 }
 
-func decodeOIDB6d60Response(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOIDB6d60Response(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D6D6RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -496,7 +497,7 @@ func decodeOIDB6d60Response(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 	return rsp.UploadFileRsp, nil
 }
 
-func decodeOIDB6d7Response(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOIDB6d7Response(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D6D7RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
diff --git a/client/group_info.go b/client/group_info.go
index da71e9fd..e42ee7c3 100644
--- a/client/group_info.go
+++ b/client/group_info.go
@@ -15,6 +15,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/binary/jce"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/client/pb/profilecard"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
@@ -187,7 +188,7 @@ func (c *QQClient) buildGroupSearchPacket(keyword string) (uint16, []byte) {
 }
 
 // SummaryCard.ReqSearch
-func decodeGroupSearchResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupSearchResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -225,7 +226,7 @@ func decodeGroupSearchResponse(_ *QQClient, _ *incomingPacketInfo, payload []byt
 }
 
 // OidbSvc.0x88d_0
-func decodeGroupInfoResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupInfoResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D88DRspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
diff --git a/client/group_msg.go b/client/group_msg.go
index f00b6dbd..3a35f250 100644
--- a/client/group_msg.go
+++ b/client/group_msg.go
@@ -14,6 +14,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/longmsg"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/client/pb/multimsg"
@@ -80,7 +81,7 @@ func (c *QQClient) SendGroupForwardMessage(groupCode int64, m *message.ForwardEl
 // GetGroupMessages 从服务器获取历史信息
 func (c *QQClient) GetGroupMessages(groupCode, beginSeq, endSeq int64) ([]*message.GroupMessage, error) {
 	seq, pkt := c.buildGetGroupMsgRequest(groupCode, beginSeq, endSeq)
-	i, err := c.sendAndWait(seq, pkt, requestParams{"raw": false})
+	i, err := c.sendAndWait(seq, pkt, network.RequestParams{"raw": false})
 	if err != nil {
 		return nil, err
 	}
@@ -296,7 +297,7 @@ func (c *QQClient) buildAtAllRemainRequestPacket(groupCode int64) (uint16, []byt
 }
 
 // OnlinePush.PbPushGroupMsg
-func decodeGroupMessagePacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupMessagePacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkt := msg.PushMessagePacket{}
 	err := proto.Unmarshal(payload, &pkt)
 	if err != nil {
@@ -337,7 +338,7 @@ func decodeGroupMessagePacket(c *QQClient, _ *incomingPacketInfo, payload []byte
 	return nil, nil
 }
 
-func decodeMsgSendResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMsgSendResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := msg.SendMessageResponse{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -352,7 +353,7 @@ func decodeMsgSendResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (
 	return nil, nil
 }
 
-func decodeGetGroupMsgResponse(c *QQClient, info *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGetGroupMsgResponse(c *QQClient, info *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := msg.GetGroupMsgResp{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -366,7 +367,7 @@ func decodeGetGroupMsgResponse(c *QQClient, info *incomingPacketInfo, payload []
 		if m.Head.FromUin == nil {
 			continue
 		}
-		if m.Content != nil && m.Content.GetPkgNum() > 1 && !info.Params.bool("raw") {
+		if m.Content != nil && m.Content.GetPkgNum() > 1 && !info.Params.Bool("raw") {
 			if m.Content.GetPkgIndex() == 0 {
 				c.Debug("build fragmented message from history")
 				i := m.Head.GetMsgSeq() - m.Content.GetPkgNum()
@@ -374,7 +375,7 @@ func decodeGetGroupMsgResponse(c *QQClient, info *incomingPacketInfo, payload []
 				for {
 					end := int32(math.Min(float64(i+19), float64(m.Head.GetMsgSeq()+m.Content.GetPkgNum())))
 					seq, pkt := c.buildGetGroupMsgRequest(m.Head.GroupInfo.GetGroupCode(), int64(i), int64(end))
-					data, err := c.sendAndWait(seq, pkt, requestParams{"raw": true})
+					data, err := c.sendAndWait(seq, pkt, network.RequestParams{"raw": true})
 					if err != nil {
 						return nil, errors.Wrap(err, "build fragmented message error")
 					}
@@ -401,7 +402,7 @@ func decodeGetGroupMsgResponse(c *QQClient, info *incomingPacketInfo, payload []
 	return ret, nil
 }
 
-func decodeAtAllRemainResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeAtAllRemainResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.D8A7RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
@@ -597,7 +598,7 @@ func (c *QQClient) buildEssenceMsgOperatePacket(groupCode int64, msgSeq, msgRand
 }
 
 // OidbSvc.0xeac_1/2
-func decodeEssenceMsgResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeEssenceMsgResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := &oidb.EACRspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
diff --git a/client/guild.go b/client/guild.go
index 7cb76426..a1852ae4 100644
--- a/client/guild.go
+++ b/client/guild.go
@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"time"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/topic"
 
 	"github.com/Mrs4s/MiraiGo/client/pb/qweb"
@@ -737,7 +738,7 @@ func (c *QQClient) buildSyncChannelFirstViewPacket() (uint16, []byte) {
 	return c.uniPacket("trpc.group_pro.synclogic.SyncLogic.SyncFirstView", payload)
 }
 
-func decodeGuildPushFirstView(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGuildPushFirstView(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	firstViewMsg := new(channel.FirstViewMsg)
 	if err := proto.Unmarshal(payload, firstViewMsg); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/guild_eventflow.go b/client/guild_eventflow.go
index 4a7d36b0..b04efe22 100644
--- a/client/guild_eventflow.go
+++ b/client/guild_eventflow.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/channel"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
@@ -26,7 +27,7 @@ type tipsPushInfo struct {
 	ChannelId uint64
 }
 
-func decodeGuildEventFlowPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGuildEventFlowPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	push := new(channel.MsgOnlinePush)
 	if err := proto.Unmarshal(payload, push); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/guild_msg.go b/client/guild_msg.go
index 61ab8120..c1bb4d4a 100644
--- a/client/guild_msg.go
+++ b/client/guild_msg.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/channel"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x388"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
@@ -290,7 +291,7 @@ func decodeGuildMessageEmojiReactions(content *channel.ChannelMsgContent) (r []*
 	return
 }
 
-func decodeGuildImageStoreResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGuildImageStoreResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	body := new(cmd0x388.D388RspBody)
 	if err := proto.Unmarshal(payload, body); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/image.go b/client/image.go
index e473a147..e3736b9f 100644
--- a/client/image.go
+++ b/client/image.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x388"
 	highway2 "github.com/Mrs4s/MiraiGo/client/pb/highway"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
@@ -337,7 +338,7 @@ func (c *QQClient) buildImageOcrRequestPacket(url, md5 string, size, weight, hei
 }
 
 // ImgStore.GroupPicUp
-func decodeGroupImageStoreResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupImageStoreResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkt := cmd0x388.D388RspBody{}
 	err := proto.Unmarshal(payload, &pkt)
 	if err != nil {
@@ -364,7 +365,7 @@ func decodeGroupImageStoreResponse(_ *QQClient, _ *incomingPacketInfo, payload [
 	}, nil
 }
 
-func decodeGroupImageDownloadResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupImageDownloadResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkt := cmd0x388.D388RspBody{}
 	if err := proto.Unmarshal(payload, &pkt); err != nil {
 		return nil, errors.Wrap(err, "unmarshal protobuf message error")
@@ -379,7 +380,7 @@ func decodeGroupImageDownloadResponse(_ *QQClient, _ *incomingPacketInfo, payloa
 }
 
 // OidbSvc.0xe07_0
-func decodeImageOcrResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeImageOcrResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.DE07RspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
diff --git a/client/internal/auth/auth.go b/client/internal/auth/auth.go
index 9ac6cfbb..65d45a6d 100644
--- a/client/internal/auth/auth.go
+++ b/client/internal/auth/auth.go
@@ -27,8 +27,8 @@ type AppVersion struct {
 	Protocol        Protocol
 }
 
-func (p Protocol) Version() *AppVersion {
-	switch p {
+func (i Protocol) Version() *AppVersion {
+	switch i {
 	case AndroidPhone: // Dumped by mirai from qq android v8.8.38
 		return &AppVersion{
 			ApkId:           "com.tencent.mobileqq",
@@ -42,7 +42,7 @@ func (p Protocol) Version() *AppVersion {
 			MiscBitmap:      184024956,
 			SubSigmap:       0x10400,
 			MainSigMap:      34869472,
-			Protocol:        p,
+			Protocol:        i,
 		}
 	case AndroidWatch:
 		return &AppVersion{
@@ -57,7 +57,7 @@ func (p Protocol) Version() *AppVersion {
 			MiscBitmap:      16252796,
 			SubSigmap:       0x10400,
 			MainSigMap:      34869472,
-			Protocol:        p,
+			Protocol:        i,
 		}
 	case IPad:
 		return &AppVersion{
@@ -72,7 +72,7 @@ func (p Protocol) Version() *AppVersion {
 			MiscBitmap:      150470524,
 			SubSigmap:       66560,
 			MainSigMap:      1970400,
-			Protocol:        p,
+			Protocol:        i,
 		}
 	case MacOS:
 		return &AppVersion{
@@ -87,7 +87,7 @@ func (p Protocol) Version() *AppVersion {
 			MiscBitmap:      150470524,
 			SubSigmap:       66560,
 			MainSigMap:      1970400,
-			Protocol:        p,
+			Protocol:        i,
 		}
 	case QiDian:
 		return &AppVersion{
@@ -102,7 +102,7 @@ func (p Protocol) Version() *AppVersion {
 			MiscBitmap:      49807228,
 			SubSigmap:       66560,
 			MainSigMap:      34869472,
-			Protocol:        p,
+			Protocol:        i,
 		}
 	}
 	return nil
diff --git a/utils/connection.go b/client/internal/network/conn.go
similarity index 99%
rename from utils/connection.go
rename to client/internal/network/conn.go
index 77f66da8..a43614c1 100644
--- a/utils/connection.go
+++ b/client/internal/network/conn.go
@@ -1,4 +1,4 @@
-package utils
+package network
 
 import (
 	"encoding/binary"
diff --git a/client/internal/network/packet.go b/client/internal/network/packet.go
new file mode 100644
index 00000000..bccfe152
--- /dev/null
+++ b/client/internal/network/packet.go
@@ -0,0 +1,31 @@
+package network
+
+type IncomingPacketInfo struct {
+	CommandName string
+	SequenceId  uint16
+	Params      RequestParams
+}
+
+type RequestParams map[string]interface{}
+
+func (p RequestParams) Bool(k string) bool {
+	if p == nil {
+		return false
+	}
+	i, ok := p[k]
+	if !ok {
+		return false
+	}
+	return i.(bool)
+}
+
+func (p RequestParams) Int32(k string) int32 {
+	if p == nil {
+		return 0
+	}
+	i, ok := p[k]
+	if !ok {
+		return 0
+	}
+	return i.(int32)
+}
diff --git a/client/internal/network/request.go b/client/internal/network/request.go
new file mode 100644
index 00000000..88ff01f0
--- /dev/null
+++ b/client/internal/network/request.go
@@ -0,0 +1,27 @@
+package network
+
+type RequestType uint32
+
+const (
+	RequestTypeLogin  = 0x0A
+	RequestTypeSimple = 0x0B
+)
+
+var emptyKey = make([]byte, 16)
+
+type EncryptType uint32
+
+const (
+	EncryptTypeNoEncrypt EncryptType = iota // 0x00
+	EncryptTypeD2Key                        // 0x01
+	EncryptTypeEmptyKey                     // 0x02
+)
+
+type Request struct {
+	Type        RequestType
+	EncryptType EncryptType
+	SequenceID  int32
+	Uin         int64
+	Method      string
+	Body        []byte
+}
diff --git a/client/internal/network/transport.go b/client/internal/network/transport.go
new file mode 100644
index 00000000..4bc4de87
--- /dev/null
+++ b/client/internal/network/transport.go
@@ -0,0 +1,127 @@
+package network
+
+import (
+	"strconv"
+	"sync"
+
+	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client/internal/auth"
+)
+
+// Transport is a network transport.
+type Transport struct {
+	sessionMu sync.Mutex
+	// todo: combine session fields to a struct
+	tgt       []byte
+	d2key     []byte
+	sessionID []byte
+	ksid      []byte
+
+	version *auth.AppVersion
+	device  *auth.Device
+
+	// connection
+	conn *TCPListener
+}
+
+func (t *Transport) packBody(req *Request, w *binary.Writer) {
+	w.WriteIntLvPacket(4, func(writer *binary.Writer) {
+		if req.Type == RequestTypeLogin {
+			writer.WriteUInt32(uint32(req.SequenceID))
+			writer.WriteUInt32(t.version.AppId)
+			writer.WriteUInt32(t.version.SubAppId)
+			writer.Write([]byte{0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00})
+			if len(t.tgt) == 0 || len(t.tgt) == 4 {
+				writer.WriteUInt32(0x04)
+			} else {
+				writer.WriteUInt32(uint32(len(t.tgt) + 4))
+				writer.Write(t.tgt)
+			}
+		}
+
+		writer.WriteString(req.Method)
+		writer.WriteUInt32(uint32(len(t.sessionID) + 4))
+		w.Write(t.sessionID)
+		if req.Type == RequestTypeLogin {
+			writer.WriteString(t.device.IMEI)
+			writer.WriteUInt32(0x04)
+			{
+				writer.WriteUInt16(uint16(len(t.ksid)) + 2)
+				writer.Write(t.ksid)
+			}
+		}
+		writer.WriteUInt32(0x04)
+	})
+
+	w.WriteUInt32(uint32(len(req.Body) + 4))
+	w.Write(req.Body)
+}
+
+func (t *Transport) Send(req *Request) error {
+	// todo: return response
+	head := binary.NewWriterF(func(w *binary.Writer) {
+		w.WriteUInt32(uint32(req.Type))
+		w.WriteUInt32(uint32(req.EncryptType))
+		switch req.Type {
+		case RequestTypeLogin:
+			switch req.EncryptType {
+			case EncryptTypeD2Key:
+				w.WriteUInt32(uint32(len(t.d2key) + 4))
+				w.Write(t.d2key)
+			default:
+				w.WriteUInt32(4)
+			}
+		case RequestTypeSimple:
+			w.WriteUInt32(uint32(req.SequenceID))
+		}
+		w.WriteString(strconv.FormatInt(req.Uin, 10))
+	})
+
+	w := binary.SelectWriter()
+	defer binary.PutWriter(w)
+	t.packBody(req, w)
+	body := w.Bytes()
+
+	// encrypt body
+	switch req.EncryptType {
+	case EncryptTypeD2Key:
+		body = binary.NewTeaCipher(t.d2key).Encrypt(body)
+	case EncryptTypeEmptyKey:
+		body = binary.NewTeaCipher(emptyKey).Encrypt(body)
+	}
+
+	w2 := binary.SelectWriter()
+	defer binary.PutWriter(w2)
+	w2.WriteUInt32(uint32(len(head) + len(body) + 4))
+	w2.Write(head)
+	w2.Write(body)
+	err := t.conn.Write(w2.Bytes())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (t *Transport) parse(head []byte) *Request {
+	req := new(Request)
+	r := binary.NewReader(head)
+	req.Type = RequestType(r.ReadInt32())
+	encryptType := EncryptType(r.ReadInt32())
+	switch req.Type {
+	case RequestTypeLogin:
+	// req.Key = r.ReadBytes(int(encryptType))
+	case RequestTypeSimple:
+		req.SequenceID = r.ReadInt32()
+	}
+	_ = r.ReadString() // req.Uin
+	body := r.ReadAvailable()
+	switch encryptType {
+	case EncryptTypeNoEncrypt:
+		req.Body = body
+	case EncryptTypeD2Key:
+		req.Body = binary.NewTeaCipher(t.d2key).Decrypt(body)
+	case EncryptTypeEmptyKey:
+		req.Body = binary.NewTeaCipher(emptyKey).Decrypt(body)
+	}
+	return req
+}
diff --git a/client/multimsg.go b/client/multimsg.go
index beace7d4..4798a6de 100644
--- a/client/multimsg.go
+++ b/client/multimsg.go
@@ -8,6 +8,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/longmsg"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/client/pb/multimsg"
@@ -44,7 +45,7 @@ func (c *QQClient) buildMultiApplyUpPacket(data, hash []byte, buType int32, grou
 }
 
 // MultiMsg.ApplyUp
-func decodeMultiApplyUpResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMultiApplyUpResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	body := multimsg.MultiRspBody{}
 	if err := proto.Unmarshal(payload, &body); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -84,7 +85,7 @@ func (c *QQClient) buildMultiApplyDownPacket(resID string) (uint16, []byte) {
 }
 
 // MultiMsg.ApplyDown
-func decodeMultiApplyDownResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMultiApplyDownResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	body := multimsg.MultiRspBody{}
 	if err := proto.Unmarshal(payload, &body); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/network.go b/client/network.go
index 4cea8a50..fc5eab50 100644
--- a/client/network.go
+++ b/client/network.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/internal/packets"
 	"github.com/Mrs4s/MiraiGo/message"
 	"github.com/Mrs4s/MiraiGo/utils"
@@ -146,13 +147,13 @@ func (c *QQClient) Disconnect() {
 }
 
 // sendAndWait 向服务器发送一个数据包, 并等待返回
-func (c *QQClient) sendAndWait(seq uint16, pkt []byte, params ...requestParams) (interface{}, error) {
+func (c *QQClient) sendAndWait(seq uint16, pkt []byte, params ...network.RequestParams) (interface{}, error) {
 	type T struct {
 		Response interface{}
 		Error    error
 	}
 	ch := make(chan T, 1)
-	var p requestParams
+	var p network.RequestParams
 
 	if len(params) != 0 {
 		p = params[0]
@@ -248,14 +249,14 @@ func (c *QQClient) sendAndWaitDynamic(seq uint16, pkt []byte) ([]byte, error) {
 }
 
 // plannedDisconnect 计划中断线事件
-func (c *QQClient) plannedDisconnect(_ *utils.TCPListener) {
+func (c *QQClient) plannedDisconnect(_ *network.TCPListener) {
 	c.Debug("planned disconnect.")
 	c.stat.DisconnectTimes.Add(1)
 	c.Online.Store(false)
 }
 
 // unexpectedDisconnect 非预期断线事件
-func (c *QQClient) unexpectedDisconnect(_ *utils.TCPListener, e error) {
+func (c *QQClient) unexpectedDisconnect(_ *network.TCPListener, e error) {
 	c.Error("unexpected disconnect: %v", e)
 	c.stat.DisconnectTimes.Add(1)
 	c.Online.Store(false)
@@ -331,7 +332,7 @@ func (c *QQClient) netLoop() {
 				var decoded interface{}
 				decoded = pkt.Payload
 				if info == nil || !info.dynamic {
-					decoded, err = decoder(c, &incomingPacketInfo{
+					decoded, err = decoder(c, &network.IncomingPacketInfo{
 						SequenceId:  pkt.SequenceId,
 						CommandName: pkt.CommandName,
 						Params:      info.getParams(),
diff --git a/client/offline_file.go b/client/offline_file.go
index ca4986c2..0fd8099e 100644
--- a/client/offline_file.go
+++ b/client/offline_file.go
@@ -3,6 +3,7 @@ package client
 import (
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x346"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -32,7 +33,7 @@ func (c *QQClient) buildOfflineFileDownloadRequestPacket(uuid []byte) (uint16, [
 	return seq, packet
 }
 
-func decodeOfflineFileDownloadResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOfflineFileDownloadResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := cmd0x346.C346RspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		c.Error("unmarshal cmd0x346 rsp body error: %v", err)
diff --git a/client/online_push.go b/client/online_push.go
index c94b0cf0..ab4de977 100644
--- a/client/online_push.go
+++ b/client/online_push.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/binary/jce"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb"
 	"github.com/Mrs4s/MiraiGo/client/pb/msgtype0x210"
 	"github.com/Mrs4s/MiraiGo/client/pb/notify"
@@ -22,7 +23,7 @@ var msg0x210Decoders = map[int64]func(*QQClient, []byte) error{
 }
 
 // OnlinePush.ReqPush
-func decodeOnlinePushReqPacket(c *QQClient, info *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeOnlinePushReqPacket(c *QQClient, info *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
diff --git a/client/ptt.go b/client/ptt.go
index a36e1f80..beb864e3 100644
--- a/client/ptt.go
+++ b/client/ptt.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/Mrs4s/MiraiGo/binary"
 	"github.com/Mrs4s/MiraiGo/client/internal/highway"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x346"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x388"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
@@ -336,7 +337,7 @@ func (c *QQClient) buildC2CPttStoreBDHExt(target int64, md5 []byte, size, voiceL
 }
 
 // PttCenterSvr.ShortVideoDownReq
-func decodePttShortVideoDownResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodePttShortVideoDownResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := pttcenter.ShortVideoRspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -348,7 +349,7 @@ func decodePttShortVideoDownResponse(_ *QQClient, _ *incomingPacketInfo, payload
 }
 
 // PttCenterSvr.GroupShortVideoUpReq
-func decodeGroupShortVideoUploadResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeGroupShortVideoUploadResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := pttcenter.ShortVideoRspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/qidian.go b/client/qidian.go
index 70f8f4fe..1054ac5d 100644
--- a/client/qidian.go
+++ b/client/qidian.go
@@ -11,6 +11,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/binary"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x3f6"
 	"github.com/Mrs4s/MiraiGo/client/pb/cmd0x6ff"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
@@ -151,7 +152,7 @@ func (c *QQClient) bigDataRequest(subCmd uint32, req proto.Message) ([]byte, err
 	return tea.Decrypt(payload), nil
 }
 
-func decodeLoginExtraResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeLoginExtraResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := cmd0x3f6.C3F6RspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -167,7 +168,7 @@ func decodeLoginExtraResponse(c *QQClient, _ *incomingPacketInfo, payload []byte
 	return nil, nil
 }
 
-func decodeConnKeyResponse(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeConnKeyResponse(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := cmd0x6ff.C501RspBody{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/recall.go b/client/recall.go
index 2567be6e..a65104e9 100644
--- a/client/recall.go
+++ b/client/recall.go
@@ -3,6 +3,7 @@ package client
 import (
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 	"github.com/Mrs4s/MiraiGo/message"
@@ -91,7 +92,7 @@ func (c *QQClient) buildPrivateRecallPacket(uin, ts int64, msgSeq, random int32)
 	return c.uniPacket("PbMessageSvc.PbMsgWithDraw", payload)
 }
 
-func decodeMsgWithDrawResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMsgWithDrawResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := msg.MsgWithDrawResp{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
diff --git a/client/security.go b/client/security.go
index bb3c6ca9..777a4031 100644
--- a/client/security.go
+++ b/client/security.go
@@ -3,6 +3,7 @@ package client
 import (
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -14,9 +15,9 @@ func init() {
 type UrlSecurityLevel int
 
 const (
-	Safe    UrlSecurityLevel = 1
-	Unknown UrlSecurityLevel = 2
-	Danger  UrlSecurityLevel = 3
+	Safe UrlSecurityLevel = iota + 1
+	Unknown
+	Danger
 )
 
 // CheckUrlSafely 通过TX服务器检查URL安全性
@@ -47,7 +48,7 @@ func (c *QQClient) buildUrlCheckRequest(url string) (uint16, []byte) {
 	return c.uniPacket("OidbSvc.0xbcb_0", payload)
 }
 
-func decodeUrlCheckResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeUrlCheckResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := &oidb.OIDBSSOPkg{}
 	rsp := &oidb.DBCBRspBody{}
 	if err := proto.Unmarshal(payload, pkg); err != nil {
diff --git a/client/sync.go b/client/sync.go
index 4703de77..470b09e8 100644
--- a/client/sync.go
+++ b/client/sync.go
@@ -8,6 +8,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/Mrs4s/MiraiGo/binary/jce"
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/msf"
 	"github.com/Mrs4s/MiraiGo/client/pb/msg"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
@@ -284,7 +285,7 @@ func (c *QQClient) buildPrivateMsgReadedPacket(uin, time int64) (uint16, []byte)
 }
 
 // StatSvc.GetDevLoginInfo
-func decodeDevListResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeDevListResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -306,7 +307,7 @@ func decodeDevListResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (
 }
 
 // RegPrxySvc.PushParam
-func decodePushParamPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodePushParamPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
@@ -351,7 +352,7 @@ func decodePushParamPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (
 }
 
 // RegPrxySvc.PbSyncMsg
-func decodeMsgSyncResponse(c *QQClient, info *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMsgSyncResponse(c *QQClient, info *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := &msf.SvcRegisterProxyMsgResp{}
 	if err := proto.Unmarshal(payload, rsp); err != nil {
 		return nil, err
@@ -395,7 +396,7 @@ func decodeMsgSyncResponse(c *QQClient, info *incomingPacketInfo, payload []byte
 }
 
 // OnlinePush.PbC2CMsgSync
-func decodeC2CSyncPacket(c *QQClient, info *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeC2CSyncPacket(c *QQClient, info *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	m := msg.PbPushMsg{}
 	if err := proto.Unmarshal(payload, &m); err != nil {
 		return nil, err
@@ -405,7 +406,7 @@ func decodeC2CSyncPacket(c *QQClient, info *incomingPacketInfo, payload []byte)
 	return nil, nil
 }
 
-func decodeMsgReadedResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeMsgReadedResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := msg.PbMsgReadedReportResp{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, errors.Wrap(err, "failed to unmarshal protobuf message")
@@ -419,7 +420,7 @@ func decodeMsgReadedResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte)
 var loginNotifyLock sync.Mutex
 
 // StatSvc.SvcReqMSFLoginNotify
-func decodeLoginNotifyPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeLoginNotifyPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	request := &jce.RequestPacket{}
 	request.ReadFrom(jce.NewJceReader(payload))
 	data := &jce.RequestDataVersion2{}
diff --git a/client/system_msg.go b/client/system_msg.go
index 5f782dc6..e6dbfdd6 100644
--- a/client/system_msg.go
+++ b/client/system_msg.go
@@ -1,6 +1,7 @@
 package client
 
 import (
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/structmsg"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -189,7 +190,7 @@ func (c *QQClient) buildSystemMsgFriendActionPacket(reqID, requester int64, acce
 }
 
 // ProfileService.Pb.ReqSystemMsgNew.Group
-func decodeSystemMsgGroupPacket(c *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeSystemMsgGroupPacket(c *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	rsp := structmsg.RspSystemMsgNew{}
 	if err := proto.Unmarshal(payload, &rsp); err != nil {
 		return nil, err
diff --git a/client/tlv_decoders.go b/client/tlv_decoders.go
index d32f9221..7df0828c 100644
--- a/client/tlv_decoders.go
+++ b/client/tlv_decoders.go
@@ -90,7 +90,9 @@ func (c *QQClient) decodeT119(data, ek []byte) {
 		// readT138(t138) // chg time
 	}
 
-	c.sigInfo = &auth.SigInfo{
+	// we don't use `c.sigInfo = &auth.SigInfo{...}` here,
+	// because we need spread `SigInfo` to other places
+	*c.sigInfo = auth.SigInfo{
 		LoginBitmap:        0,
 		SrmToken:           utils.Select(m[0x16a], c.sigInfo.SrmToken),
 		T133:               utils.Select(m[0x133], c.sigInfo.T133),
diff --git a/client/translate.go b/client/translate.go
index a27f9032..946cec49 100644
--- a/client/translate.go
+++ b/client/translate.go
@@ -3,6 +3,7 @@ package client
 import (
 	"github.com/pkg/errors"
 
+	"github.com/Mrs4s/MiraiGo/client/internal/network"
 	"github.com/Mrs4s/MiraiGo/client/pb/oidb"
 	"github.com/Mrs4s/MiraiGo/internal/proto"
 )
@@ -40,7 +41,7 @@ func (c *QQClient) Translate(src, dst, text string) (string, error) {
 }
 
 // OidbSvc.0x990
-func decodeTranslateResponse(_ *QQClient, _ *incomingPacketInfo, payload []byte) (interface{}, error) {
+func decodeTranslateResponse(_ *QQClient, _ *network.IncomingPacketInfo, payload []byte) (interface{}, error) {
 	pkg := oidb.OIDBSSOPkg{}
 	rsp := oidb.TranslateRspBody{}
 	if err := proto.Unmarshal(payload, &pkg); err != nil {
diff --git a/internal/generator/c2c_switcher/c2c_switcher.go b/internal/generator/c2c_switcher/c2c_switcher.go
index 649b2ea4..99085cb7 100644
--- a/internal/generator/c2c_switcher/c2c_switcher.go
+++ b/internal/generator/c2c_switcher/c2c_switcher.go
@@ -27,7 +27,7 @@ const (
 {{end}}
 )
 
-func peekC2CDecoder(msgType int32) (decoder func(*QQClient, *msg.Message, *incomingPacketInfo), decoderType uint8) {
+func peekC2CDecoder(msgType int32) (decoder func(*QQClient, *msg.Message, *network.IncomingPacketInfo), decoderType uint8) {
     switch msgType {
 {{range .Decoders}}	case {{.Id}}:
 		return {{.Func}}, {{.DecoderType}}