/
link.go
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/
link.go
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// MIT License
// Copyright (c) [2022] [Bohdan Ivashko (https://github.com/Arriven)]
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package packetgen
import (
"fmt"
"net"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/Arriven/db1000n/src/utils"
)
func BuildLinkLayer(c LayerConfig) (gopacket.LinkLayer, error) {
switch c.Type {
case "":
return nil, nil
case "ethernet":
var packetConfig EthernetPacketConfig
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return buildEthernetPacket(packetConfig), nil
default:
return nil, fmt.Errorf("unsupported link layer type %s", c.Type)
}
}
// EthernetPacketConfig describes ethernet layer configuration
type EthernetPacketConfig struct {
SrcMAC string
DstMAC string
}
// buildEthernetPacket generates an layers.Ethernet and returns it with source MAC address and destination MAC address
func buildEthernetPacket(c EthernetPacketConfig) *layers.Ethernet {
srcMac := net.HardwareAddr(c.SrcMAC)
dstMac := net.HardwareAddr(c.DstMAC)
return &layers.Ethernet{
SrcMAC: net.HardwareAddr{srcMac[0], srcMac[1], srcMac[2], srcMac[3], srcMac[4], srcMac[5]},
DstMAC: net.HardwareAddr{dstMac[0], dstMac[1], dstMac[2], dstMac[3], dstMac[4], dstMac[5]},
}
}