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新TAP测试(TODO 解析arp)

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This commit is contained in:
黄思敏 2022-09-01 14:16:36 +08:00
parent bcd25a2444
commit ccff98d5e3
6 changed files with 181 additions and 395 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
netcard.go
View File

@ -102,10 +102,13 @@ func NewNetTunnel() *NetTunnel {
switch frame.Ethertype() { switch frame.Ethertype() {
case ethernet.ARP: case ethernet.ARP:
log.Printf("bytes len: %d type(arp): % x", len(rbuf), frame.Ethertype()) // 数据长度 log.Printf("bytes len: %d type(arp): % x", len(rbuf), frame.Ethertype()) // 数据长度
arp := ARP(frame)
log.Println(arp.IPv4Source(), arp.Source(), arp.IPv4Destination(), arp.Destination())
SwapBytes(frame, 0, frame, 6, 6) SwapBytes(frame, 0, frame, 6, 6)
binary.BigEndian.PutUint16(frame[20:22], 2) binary.BigEndian.PutUint16(frame[20:22], 2)
SwapBytes(frame, 22, frame, 32, 10) SwapBytes(frame, 22, frame, 32, 10)
nt.ifce.Write(frame) nt.ifce.Write(frame)
//TODO: 解析arp 回应arp //TODO: 解析arp 回应arp
@ -152,7 +155,7 @@ func NewNetTunnel() *NetTunnel {
payload := frame.Payload() payload := frame.Payload()
log.Println(frame.Source(), net.IP(payload[12:16]).To4(), binary.BigEndian.Uint16(payload[20:22]), frame.Destination(), net.IP(payload[16:20]).To4(), binary.BigEndian.Uint16(payload[22:24])) log.Println(frame.Source(), net.IP(payload[12:16]).To4(), binary.BigEndian.Uint16(payload[20:22]), frame.Destination(), net.IP(payload[16:20]).To4(), binary.BigEndian.Uint16(payload[22:24]))
_, err := nt.ifce.Write(payload) _, err := nt.ifce.Write(frame)
if err != nil { if err != nil {
log.Println(err) log.Println(err)
} }

291
netcard_old.go
View File

@ -1,291 +0,0 @@
package main
import (
"bytes"
"context"
"crypto/md5"
"encoding/binary"
"encoding/gob"
"fmt"
"log"
"net"
"os/exec"
gen "slimming/proto/gen"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/klauspost/compress/zstd"
"github.com/songgao/packets/ethernet"
"github.com/songgao/water"
"github.com/songgao/water/waterutil"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
)
type ExchangeBuffer_OLD struct {
BytesArray [][]byte
}
type NetCard_OLD struct {
FrameChan chan []byte
ifce *water.Interface
server *RPCServer_OLD
clientMap map[string]*RPCClient_OLD
lock sync.Mutex
}
func (nc *NetCard_OLD) Lock(do func()) {
nc.lock.Lock()
defer nc.lock.Unlock()
do()
}
type RPCClient_OLD struct {
FrameChan chan *ExchangeBuffer_OLD
conn *grpc.ClientConn
}
func (cli *RPCClient_OLD) connect(realAddr string) {
log.Println("rpcclient connect", realAddr)
// defer log.Println("rpcclient exit")
conn, err := grpc.Dial(realAddr,
grpc.WithTransportCredentials(insecure.NewCredentials()),
)
if err != nil {
log.Printf("did not connect: %v", err)
return
}
cli.conn = conn
go cli.run()
time.Sleep(time.Millisecond)
}
func (cli *RPCClient_OLD) run() {
defer log.Println("rpcclient exit")
defer func() {
if err := recover(); err != nil {
log.Println("recover")
cli.conn = nil
}
}()
cliService := gen.NewFrameServiceClient(cli.conn)
stream, err := cliService.SendFrames(context.Background())
if err != nil {
log.Panic(err)
}
buf := bytes.NewBuffer(nil)
for {
// Contact the server and print out its response.
buf.Reset()
// encode gob
enc := gob.NewEncoder(buf)
cliBuffer := <-cli.FrameChan
log.Printf("send to target %s source bytes: %d", waterutil.IPv4Destination(cliBuffer.BytesArray[0]), len(cliBuffer.BytesArray[0]))
err := enc.Encode(cliBuffer.BytesArray)
if err != nil {
log.Panic(err)
}
// zstd compress
zenc, err := zstd.NewWriter(buf)
if err != nil {
log.Panic(err)
}
err = zenc.Flush()
if err != nil {
log.Println(err)
}
// 发到对面的网卡
err = stream.Send(&gen.Request{
Frames: buf.Bytes(),
})
if err != nil {
log.Panic(err)
}
}
}
func (nc *NetCard_OLD) Run() {
go nc.runRead()
go nc.runWrite()
// go nc.cli.run()
time.Sleep(time.Second)
cmdstr := fmt.Sprintf("ip addr add %s dev stun", config.Network.Self.Virt)
log.Println(cmdstr)
cmd := strings.Split(cmdstr, " ")
err := exec.Command(cmd[0], cmd[1:]...).Run()
if err != nil {
log.Panic(err)
}
cmdstr = "ip link set dev stun up"
cmd = strings.Split(cmdstr, " ")
err = exec.Command(cmd[0], cmd[1:]...).Run()
if err != nil {
log.Panic(err)
}
nc.server.run()
}
func NewNetCard_OLD() *NetCard_OLD {
config := water.Config{
DeviceType: water.TUN,
PlatformSpecificParams: water.PlatformSpecificParams{
Name: "stun",
},
}
ifce, err := water.New(config)
if err != nil {
log.Panic(err)
}
nc := &NetCard_OLD{
FrameChan: make(chan []byte, 3000),
ifce: ifce,
clientMap: map[string]*RPCClient_OLD{},
}
nc.server = newRPCServer_OLD(nc)
return nc
}
func (nc *NetCard_OLD) runRead() {
log.Println("start netcard read")
var ifce *water.Interface = nc.ifce
for {
var bytesMap map[string]*ExchangeBuffer_OLD = make(map[string]*ExchangeBuffer_OLD)
var ok bool
var isLoop int32 = 1
// 20 微秒后停止收集数据
go func() {
var after = time.NewTimer(time.Millisecond * 20)
<-after.C
atomic.StoreInt32(&isLoop, 0)
}()
for atomic.LoadInt32(&isLoop) > 0 {
var rframe ethernet.Frame
rframe.Resize(1500)
n, err := ifce.Read([]byte(rframe))
if err != nil {
log.Fatal(err)
}
rframe = rframe[:n]
if !waterutil.IsIPv4(rframe) || waterutil.IPv4Source(rframe).Equal(net.IPv4(0, 0, 0, 0)) {
continue
}
var realAddr string = ""
config.Lock(func() {
if realAddr, ok = config.IPv4Nodes[binary.LittleEndian.Uint32([]byte(waterutil.IPv4Destination(rframe)))]; !ok {
return
}
})
if realAddr == "" {
log.Printf("%s is not exists", waterutil.IPv4Destination(rframe))
continue
}
// log.Printf("Payload: % x\n", rframe.Payload())
log.Printf("Ethertype: % x %v realAddr %s\n", rframe.Ethertype(), waterutil.IsIPv4(rframe), realAddr)
log.Printf("Src %s Dst: %s\n", waterutil.IPv4Source(rframe), waterutil.IPv4Destination(rframe))
var buffer *ExchangeBuffer_OLD
if buffer, ok = bytesMap[realAddr]; !ok {
buffer = &ExchangeBuffer_OLD{BytesArray: make([][]byte, 0, 1000)}
bytesMap[realAddr] = buffer
}
h := md5.New()
h.Write([]byte(rframe))
log.Printf("%x", h.Sum(nil))
buffer.BytesArray = append(buffer.BytesArray, []byte(rframe))
}
for dst, buffer := range bytesMap {
var cli *RPCClient_OLD
if cli, ok = nc.clientMap[dst]; !ok {
cli = &RPCClient_OLD{FrameChan: make(chan *ExchangeBuffer_OLD)}
nc.clientMap[dst] = cli
}
if cli.conn == nil {
cli.connect(dst)
} else {
cli.FrameChan <- buffer // 网卡数据 发到对方
}
}
// 写到grpc服务
// log.Printf("Dst: %s\n", rframe.Destination()[0:4])
// log.Printf("Src: %s\n", rframe.Source()[0:4])
// log.Printf("Ethertype: % x\n", rframe.Ethertype())
// log.Printf("Payload: % x\n", rframe.Payload())
}
}
func (nc *NetCard_OLD) runWrite() {
var ifce *water.Interface = nc.ifce
var err error
for wframe := range nc.FrameChan {
log.Printf("get wframes bytes len: %d", len(wframe))
var buf = bytes.NewBuffer(wframe)
var zdec *zstd.Decoder
zdec, err = zstd.NewReader(buf)
if err != nil {
log.Panic(err)
}
zdec.Close()
dec := gob.NewDecoder(buf)
var bufs [][]byte
err = dec.Decode(&bufs)
if err != nil {
log.Panic(err)
}
for _, buf := range bufs {
h := md5.New()
h.Write(buf)
log.Printf("get wframes decode len: %d, write buf hash: %x", len(buf), h.Sum(nil))
log.Printf("get decode frames decode source: %s dst: %s", waterutil.IPv4Source(buf), waterutil.IPv4Destination(buf))
_, err := ifce.Write(buf)
if err != nil {
log.Panic(err)
}
}
}
}

198
proto/gen/frame.pb.go
View File

@ -26,17 +26,16 @@ const (
) )
// 请求 // 请求
type Request struct { type RequestFrames struct {
state protoimpl.MessageState state protoimpl.MessageState
sizeCache protoimpl.SizeCache sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields unknownFields protoimpl.UnknownFields
Type int32 `protobuf:"varint,1,opt,name=Type,proto3" json:"Type,omitempty"`
Frames []byte `protobuf:"bytes,2,opt,name=Frames,proto3" json:"Frames,omitempty"` Frames []byte `protobuf:"bytes,2,opt,name=Frames,proto3" json:"Frames,omitempty"`
} }
func (x *Request) Reset() { func (x *RequestFrames) Reset() {
*x = Request{} *x = RequestFrames{}
if protoimpl.UnsafeEnabled { if protoimpl.UnsafeEnabled {
mi := &file_proto_frame_proto_msgTypes[0] mi := &file_proto_frame_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -44,13 +43,13 @@ func (x *Request) Reset() {
} }
} }
func (x *Request) String() string { func (x *RequestFrames) String() string {
return protoimpl.X.MessageStringOf(x) return protoimpl.X.MessageStringOf(x)
} }
func (*Request) ProtoMessage() {} func (*RequestFrames) ProtoMessage() {}
func (x *Request) ProtoReflect() protoreflect.Message { func (x *RequestFrames) ProtoReflect() protoreflect.Message {
mi := &file_proto_frame_proto_msgTypes[0] mi := &file_proto_frame_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil { if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x)) ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@ -62,19 +61,12 @@ func (x *Request) ProtoReflect() protoreflect.Message {
return mi.MessageOf(x) return mi.MessageOf(x)
} }
// Deprecated: Use Request.ProtoReflect.Descriptor instead. // Deprecated: Use RequestFrames.ProtoReflect.Descriptor instead.
func (*Request) Descriptor() ([]byte, []int) { func (*RequestFrames) Descriptor() ([]byte, []int) {
return file_proto_frame_proto_rawDescGZIP(), []int{0} return file_proto_frame_proto_rawDescGZIP(), []int{0}
} }
func (x *Request) GetType() int32 { func (x *RequestFrames) GetFrames() []byte {
if x != nil {
return x.Type
}
return 0
}
func (x *Request) GetFrames() []byte {
if x != nil { if x != nil {
return x.Frames return x.Frames
} }
@ -145,26 +137,88 @@ func (x *Response) GetData() []byte {
return nil return nil
} }
// 请求
type RequestMacIP struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
IP []byte `protobuf:"bytes,1,opt,name=IP,proto3" json:"IP,omitempty"`
MAC []byte `protobuf:"bytes,2,opt,name=MAC,proto3" json:"MAC,omitempty"`
}
func (x *RequestMacIP) Reset() {
*x = RequestMacIP{}
if protoimpl.UnsafeEnabled {
mi := &file_proto_frame_proto_msgTypes[2]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *RequestMacIP) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*RequestMacIP) ProtoMessage() {}
func (x *RequestMacIP) ProtoReflect() protoreflect.Message {
mi := &file_proto_frame_proto_msgTypes[2]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use RequestMacIP.ProtoReflect.Descriptor instead.
func (*RequestMacIP) Descriptor() ([]byte, []int) {
return file_proto_frame_proto_rawDescGZIP(), []int{2}
}
func (x *RequestMacIP) GetIP() []byte {
if x != nil {
return x.IP
}
return nil
}
func (x *RequestMacIP) GetMAC() []byte {
if x != nil {
return x.MAC
}
return nil
}
var File_proto_frame_proto protoreflect.FileDescriptor var File_proto_frame_proto protoreflect.FileDescriptor
var file_proto_frame_proto_rawDesc = []byte{ var file_proto_frame_proto_rawDesc = []byte{
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0x6f, 0x2f, 0x67, 0x65, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
} }
var ( var (
@ -179,16 +233,19 @@ func file_proto_frame_proto_rawDescGZIP() []byte {
return file_proto_frame_proto_rawDescData return file_proto_frame_proto_rawDescData
} }
var file_proto_frame_proto_msgTypes = make([]protoimpl.MessageInfo, 2) var file_proto_frame_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
var file_proto_frame_proto_goTypes = []interface{}{ var file_proto_frame_proto_goTypes = []interface{}{
(*Request)(nil), // 0: frame.Request (*RequestFrames)(nil), // 0: frame.RequestFrames
(*Response)(nil), // 1: frame.Response (*Response)(nil), // 1: frame.Response
(*RequestMacIP)(nil), // 2: frame.RequestMacIP
} }
var file_proto_frame_proto_depIdxs = []int32{ var file_proto_frame_proto_depIdxs = []int32{
0, // 0: frame.FrameService.SendFrames:input_type -> frame.Request 0, // 0: frame.FrameService.SendFrames:input_type -> frame.RequestFrames
1, // 1: frame.FrameService.SendFrames:output_type -> frame.Response 2, // 1: frame.FrameService.SendMacIP:input_type -> frame.RequestMacIP
1, // [1:2] is the sub-list for method output_type 1, // 2: frame.FrameService.SendFrames:output_type -> frame.Response
0, // [0:1] is the sub-list for method input_type 1, // 3: frame.FrameService.SendMacIP:output_type -> frame.Response
2, // [2:4] is the sub-list for method output_type
0, // [0:2] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name 0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee 0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name 0, // [0:0] is the sub-list for field type_name
@ -201,7 +258,7 @@ func file_proto_frame_proto_init() {
} }
if !protoimpl.UnsafeEnabled { if !protoimpl.UnsafeEnabled {
file_proto_frame_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} { file_proto_frame_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Request); i { switch v := v.(*RequestFrames); i {
case 0: case 0:
return &v.state return &v.state
case 1: case 1:
@ -224,6 +281,18 @@ func file_proto_frame_proto_init() {
return nil return nil
} }
} }
file_proto_frame_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*RequestMacIP); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
} }
type x struct{} type x struct{}
out := protoimpl.TypeBuilder{ out := protoimpl.TypeBuilder{
@ -231,7 +300,7 @@ func file_proto_frame_proto_init() {
GoPackagePath: reflect.TypeOf(x{}).PkgPath(), GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_proto_frame_proto_rawDesc, RawDescriptor: file_proto_frame_proto_rawDesc,
NumEnums: 0, NumEnums: 0,
NumMessages: 2, NumMessages: 3,
NumExtensions: 0, NumExtensions: 0,
NumServices: 1, NumServices: 1,
}, },
@ -258,6 +327,7 @@ const _ = grpc.SupportPackageIsVersion6
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream. // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type FrameServiceClient interface { type FrameServiceClient interface {
SendFrames(ctx context.Context, opts ...grpc.CallOption) (FrameService_SendFramesClient, error) SendFrames(ctx context.Context, opts ...grpc.CallOption) (FrameService_SendFramesClient, error)
SendMacIP(ctx context.Context, in *RequestMacIP, opts ...grpc.CallOption) (*Response, error)
} }
type frameServiceClient struct { type frameServiceClient struct {
@ -278,7 +348,7 @@ func (c *frameServiceClient) SendFrames(ctx context.Context, opts ...grpc.CallOp
} }
type FrameService_SendFramesClient interface { type FrameService_SendFramesClient interface {
Send(*Request) error Send(*RequestFrames) error
CloseAndRecv() (*Response, error) CloseAndRecv() (*Response, error)
grpc.ClientStream grpc.ClientStream
} }
@ -287,7 +357,7 @@ type frameServiceSendFramesClient struct {
grpc.ClientStream grpc.ClientStream
} }
func (x *frameServiceSendFramesClient) Send(m *Request) error { func (x *frameServiceSendFramesClient) Send(m *RequestFrames) error {
return x.ClientStream.SendMsg(m) return x.ClientStream.SendMsg(m)
} }
@ -302,9 +372,19 @@ func (x *frameServiceSendFramesClient) CloseAndRecv() (*Response, error) {
return m, nil return m, nil
} }
func (c *frameServiceClient) SendMacIP(ctx context.Context, in *RequestMacIP, opts ...grpc.CallOption) (*Response, error) {
out := new(Response)
err := c.cc.Invoke(ctx, "/frame.FrameService/SendMacIP", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// FrameServiceServer is the server API for FrameService service. // FrameServiceServer is the server API for FrameService service.
type FrameServiceServer interface { type FrameServiceServer interface {
SendFrames(FrameService_SendFramesServer) error SendFrames(FrameService_SendFramesServer) error
SendMacIP(context.Context, *RequestMacIP) (*Response, error)
} }
// UnimplementedFrameServiceServer can be embedded to have forward compatible implementations. // UnimplementedFrameServiceServer can be embedded to have forward compatible implementations.
@ -314,6 +394,9 @@ type UnimplementedFrameServiceServer struct {
func (*UnimplementedFrameServiceServer) SendFrames(FrameService_SendFramesServer) error { func (*UnimplementedFrameServiceServer) SendFrames(FrameService_SendFramesServer) error {
return status.Errorf(codes.Unimplemented, "method SendFrames not implemented") return status.Errorf(codes.Unimplemented, "method SendFrames not implemented")
} }
func (*UnimplementedFrameServiceServer) SendMacIP(context.Context, *RequestMacIP) (*Response, error) {
return nil, status.Errorf(codes.Unimplemented, "method SendMacIP not implemented")
}
func RegisterFrameServiceServer(s *grpc.Server, srv FrameServiceServer) { func RegisterFrameServiceServer(s *grpc.Server, srv FrameServiceServer) {
s.RegisterService(&_FrameService_serviceDesc, srv) s.RegisterService(&_FrameService_serviceDesc, srv)
@ -325,7 +408,7 @@ func _FrameService_SendFrames_Handler(srv interface{}, stream grpc.ServerStream)
type FrameService_SendFramesServer interface { type FrameService_SendFramesServer interface {
SendAndClose(*Response) error SendAndClose(*Response) error
Recv() (*Request, error) Recv() (*RequestFrames, error)
grpc.ServerStream grpc.ServerStream
} }
@ -337,18 +420,41 @@ func (x *frameServiceSendFramesServer) SendAndClose(m *Response) error {
return x.ServerStream.SendMsg(m) return x.ServerStream.SendMsg(m)
} }
func (x *frameServiceSendFramesServer) Recv() (*Request, error) { func (x *frameServiceSendFramesServer) Recv() (*RequestFrames, error) {
m := new(Request) m := new(RequestFrames)
if err := x.ServerStream.RecvMsg(m); err != nil { if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err return nil, err
} }
return m, nil return m, nil
} }
func _FrameService_SendMacIP_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(RequestMacIP)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(FrameServiceServer).SendMacIP(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/frame.FrameService/SendMacIP",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(FrameServiceServer).SendMacIP(ctx, req.(*RequestMacIP))
}
return interceptor(ctx, in, info, handler)
}
var _FrameService_serviceDesc = grpc.ServiceDesc{ var _FrameService_serviceDesc = grpc.ServiceDesc{
ServiceName: "frame.FrameService", ServiceName: "frame.FrameService",
HandlerType: (*FrameServiceServer)(nil), HandlerType: (*FrameServiceServer)(nil),
Methods: []grpc.MethodDesc{}, Methods: []grpc.MethodDesc{
{
MethodName: "SendMacIP",
Handler: _FrameService_SendMacIP_Handler,
},
},
Streams: []grpc.StreamDesc{ Streams: []grpc.StreamDesc{
{ {
StreamName: "SendFrames", StreamName: "SendFrames",

2
rpc_client.go
View File

@ -100,7 +100,7 @@ func (cli *RPCClient) run() {
frames = nil frames = nil
// 发到对面的网卡 // 发到对面的网卡
err = stream.Send(&gen.Request{ err = stream.Send(&gen.RequestFrames{
Frames: buf.Bytes(), Frames: buf.Bytes(),
}) })

56
rpc_old.go
View File

@ -1,56 +0,0 @@
package main
import (
"log"
"net"
gen "slimming/proto/gen"
"google.golang.org/grpc"
)
type RPCServer_OLD struct {
gen.UnimplementedFrameServiceServer
netCard *NetCard_OLD
}
var ()
func newRPCServer_OLD(netCard *NetCard_OLD) *RPCServer_OLD {
return &RPCServer_OLD{netCard: netCard}
}
func (rpc *RPCServer_OLD) run() {
lis, err := net.Listen("tcp", config.Network.Self.Real)
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
s := grpc.NewServer()
gen.RegisterFrameServiceServer(s, rpc)
log.Printf("server listening at %v", lis.Addr())
if err := s.Serve(lis); err != nil {
log.Fatalf("failed to serve: %v", err)
}
}
// SayHello implements helloworld.GreeterServer
func (s *RPCServer_OLD) SendFrames(stream gen.FrameService_SendFramesServer) error {
log.Printf("Start: %v", stream)
for {
request, err := stream.Recv()
if err != nil {
log.Panic(err)
}
log.Printf("request: %v", len(request.Frames))
s.netCard.FrameChan <- request.GetFrames() // 接受数据 广播到网卡上
}
// err := stream.SendAndClose(&gen.Response{Code: 0})
// if err != nil {
// log.Panic(err)
// }
return nil
}

24
utils.go
View File

@ -2,9 +2,11 @@ package main
import ( import (
"bytes" "bytes"
"encoding/binary"
"encoding/gob" "encoding/gob"
"io" "io"
"log" "log"
"net"
"github.com/klauspost/compress/zstd" "github.com/klauspost/compress/zstd"
"github.com/songgao/water/waterutil" "github.com/songgao/water/waterutil"
@ -61,3 +63,25 @@ func SwapBytes(frame1 []byte, start1 int, frame2 []byte, start2 int, size int) {
copy(frame1[start1:start1+size], frame2[start2:start2+size]) copy(frame1[start1:start1+size], frame2[start2:start2+size])
copy(frame2[start2:start2+size], temp) copy(frame2[start2:start2+size], temp)
} }
type ARP []byte
func (arp ARP) Destination() net.HardwareAddr {
return net.HardwareAddr(arp[:6])
}
func (arp ARP) Source() net.HardwareAddr {
return net.HardwareAddr(arp[6:12])
}
func (arp ARP) Op() uint16 {
return binary.BigEndian.Uint16(arp[20:22])
}
func (arp ARP) IPv4Source() net.IP {
return net.IP(arp[28:32])
}
func (arp ARP) IPv4Destination() net.IP {
return net.IP(arp[38:42])
}