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payload.go
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payload.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"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/zlaya-sobaka/db1000n_mobile/src/utils"
)
func BuildPayload(c LayerConfig) (gopacket.Layer, error) {
switch c.Type {
case "":
return nil, nil
case "raw":
var packetConfig struct {
Payload string
}
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return gopacket.Payload([]byte(packetConfig.Payload)), nil
case "icmpv4":
var packetConfig ICMPV4PacketConfig
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return buildICMPV4Packet(packetConfig), nil
case "dns":
var packetConfig DNSPacketConfig
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return buildDNSPacket(packetConfig), nil
default:
return nil, fmt.Errorf("unsupported layer type %s", c.Type)
}
}
type ICMPV4PacketConfig struct {
TypeCode uint16 `mapstructure:"code"`
ID uint16
Seq uint16
}
func buildICMPV4Packet(c ICMPV4PacketConfig) *layers.ICMPv4 {
return &layers.ICMPv4{
TypeCode: layers.ICMPv4TypeCode(c.TypeCode),
Id: c.ID,
Seq: c.Seq,
}
}
type DNSPacketConfig struct {
ID uint16
Qr bool
OpCode uint8 `mapstructure:"code"`
QDCount uint16
}
func buildDNSPacket(c DNSPacketConfig) *layers.DNS {
return &layers.DNS{
ID: c.ID,
QR: c.Qr,
OpCode: layers.DNSOpCode(c.OpCode),
QDCount: c.QDCount,
}
}