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ip4.go
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ip4.go
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/*
* NETCAP - Traffic Analysis Framework
* Copyright (c) 2017 Philipp Mieden <dreadl0ck [at] protonmail [dot] ch>
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package encoder
import (
"github.com/dreadl0ck/netcap/types"
"github.com/golang/protobuf/proto"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
)
var ipv4Encoder = CreateLayerEncoder(
types.Type_NC_IPv4,
layers.LayerTypeIPv4,
func(layer gopacket.Layer, timestamp string) proto.Message {
if ip4, ok := layer.(*layers.IPv4); ok {
var opts []*types.IPv4Option
for _, o := range ip4.Options {
opts = append(opts, &types.IPv4Option{
OptionData: o.OptionData,
OptionLength: int32(o.OptionLength),
OptionType: int32(o.OptionType),
})
}
return &types.IPv4{
Timestamp: timestamp,
Version: int32(ip4.Version),
IHL: int32(ip4.IHL),
TOS: int32(ip4.TOS),
Length: int32(ip4.Length),
Id: int32(ip4.Id),
Flags: int32(ip4.Flags),
FragOffset: int32(ip4.FragOffset),
TTL: int32(ip4.TTL),
Protocol: int32(ip4.Protocol),
Checksum: int32(ip4.Checksum),
SrcIP: ip4.SrcIP.String(),
DstIP: ip4.DstIP.String(),
Padding: ip4.Padding,
Options: opts,
PayloadEntropy: Entropy(ip4.Payload),
PayloadSize: int32(len(ip4.Payload)),
}
}
return nil
})