updates

Downloads/GoNetDev-master/Protocols/SendRecv/Syscall.go

@@ -0,0 +1,72 @@
+package SendRecv
+
+import (
+	"github.com/sabouaram/GoNetDev/Protocols"
+	"github.com/sabouaram/GoNetDev/Protocols/Utils"
+	"github.com/sabouaram/GoNetDev/Protocols/Utils/GLogger"
+	"net"
+	"syscall"
+)
+
+func SyscallRawEth() (fd int) {
+	fd, error := syscall.Socket(syscall.AF_PACKET, syscall.SOCK_RAW, 0x0300)
+
+	if error != nil {
+		syscall.Close(fd)
+		panic(error)
+	}
+	return fd
+}
+
+func ReceiveFrame(interface_name string, byte_size int, chn chan Protocols.Frame) error {
+	fd := SyscallRawEth()
+	err := syscall.BindToDevice(fd, interface_name)
+	if err != nil {
+		syscall.Close(fd)
+		panic(err)
+	}
+
+	buffer := make([]byte, byte_size)
+	logger := GLogger.GetInstance()
+	logger.Printf("RX:%s", interface_name)
+	Frames_received_metric := Utils.NewPromCounter("frames_received", "frames received per interface", []string{"interface_name"})
+	Utils.Register(Frames_received_metric)
+	for true {
+		syscall.Recvfrom(fd, buffer, 0)
+		Frame := Protocols.Parse(buffer)
+		chn <-  Frame
+		Frames_received_metric.With(Utils.NewLabel("interface_name", interface_name)).Inc()
+		logger.Printf("RX:%s", interface_name)
+
+	}
+	return nil
+}
+
+func SendFrame(interface_name string, frame []byte) (count_bytes int, err error) {
+	fd := SyscallRawEth()
+	interface_info, err := net.InterfaceByName(interface_name)
+	if err != nil {
+		return 0, err
+	}
+	var haddr [8]byte
+	copy(haddr[0:7], interface_info.HardwareAddr[0:7])
+	addr := syscall.SockaddrLinklayer{
+		Protocol: syscall.ETH_P_IP,
+		Ifindex:  interface_info.Index,
+		Halen:    uint8(len(interface_info.HardwareAddr)),
+		Addr:     haddr,
+	}
+	err = syscall.Bind(fd, &addr)
+	if err != nil {
+		return 0, err
+	}
+	err = syscall.SetLsfPromisc(interface_name, true)
+	if err != nil {
+		return 0, err
+	}
+	n, err := syscall.Write(fd, frame)
+	if err != nil {
+		return 0, err
+	}
+	return n, err
+}