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transport.go
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transport.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 BuildTransportLayer(c LayerConfig, network gopacket.NetworkLayer) (gopacket.TransportLayer, error) {
switch c.Type {
case "":
return nil, nil
case "tcp":
var packetConfig TCPPacketConfig
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return buildTCPPacket(packetConfig, network), nil
case "udp":
var packetConfig UDPPacketConfig
if err := utils.Decode(c.Data, &packetConfig); err != nil {
return nil, err
}
return buildUDPPacket(packetConfig, network), nil
default:
return nil, fmt.Errorf("unsupported link layer type %s", c.Type)
}
}
// UDPPacketConfig describes udp layer configuration
type UDPPacketConfig struct {
SrcPort int `mapstructure:"src_port,string"`
DstPort int `mapstructure:"dst_port,string"`
}
func buildUDPPacket(c UDPPacketConfig, network gopacket.NetworkLayer) *layers.UDP {
result := &layers.UDP{
SrcPort: layers.UDPPort(c.SrcPort),
DstPort: layers.UDPPort(c.DstPort),
}
if err := result.SetNetworkLayerForChecksum(network); err != nil {
return nil
}
return result
}
// TCPFlagsConfig stores flags to be set on tcp layer
type TCPFlagsConfig struct {
SYN bool
ACK bool
FIN bool
RST bool
PSH bool
URG bool
ECE bool
CWR bool
NS bool
}
// TCPPacketConfig describes tcp layer configuration
type TCPPacketConfig struct {
SrcPort int `mapstructure:"src_port,string"`
DstPort int `mapstructure:"dst_port,string"`
Seq uint32
Ack uint32
Window uint16
Urgent uint16
Flags TCPFlagsConfig
}
// buildTCPPacket generates a layers.TCP and returns it with source port and destination port
func buildTCPPacket(c TCPPacketConfig, network gopacket.NetworkLayer) *layers.TCP {
result := &layers.TCP{
SrcPort: layers.TCPPort(c.SrcPort),
DstPort: layers.TCPPort(c.DstPort),
Window: c.Window,
Urgent: c.Urgent,
Seq: c.Seq,
Ack: c.Ack,
SYN: c.Flags.SYN,
ACK: c.Flags.ACK,
FIN: c.Flags.FIN,
RST: c.Flags.RST,
PSH: c.Flags.PSH,
URG: c.Flags.URG,
ECE: c.Flags.ECE,
CWR: c.Flags.CWR,
NS: c.Flags.NS,
}
if err := result.SetNetworkLayerForChecksum(network); err != nil {
return nil
}
return result
}