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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 types
import (
"encoding/hex"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
)
var fieldsIPv4 = []string{
"Timestamp",
"Version", // int32
"IHL", // int32
"TOS", // int32
"Length", // int32
"Id", // int32
"Flags", // int32
"FragOffset", // int32
"TTL", // int32
"Protocol", // int32
"Checksum", // int32
"SrcIP", // string
"DstIP", // string
"Padding", // []byte
"Options", // []*IPv4Option
"PayloadEntropy", // float64
"PayloadSize", // int32
}
func (i IPv4) CSVHeader() []string {
return filter(fieldsIPv4)
}
func (i IPv4) CSVRecord() []string {
var opts []string
for _, o := range i.Options {
opts = append(opts, o.ToString())
}
return filter([]string{
formatTimestamp(i.Timestamp),
formatInt32(i.Version), // int32
formatInt32(i.IHL), // int32
formatInt32(i.TOS), // int32
formatInt32(i.Length), // int32
formatInt32(i.Id), // int32
formatInt32(i.Flags), // int32
formatInt32(i.FragOffset), // int32
formatInt32(i.TTL), // int32
formatInt32(i.Protocol), // int32
formatInt32(i.Checksum), // int32
i.SrcIP, // string
i.DstIP, // string
hex.EncodeToString(i.Padding), // []byte
strings.Join(opts, ""), // []*IPv4Option
strconv.FormatFloat(i.PayloadEntropy, 'f', 6, 64), // float64
formatInt32(i.PayloadSize), // int32
})
}
func (i IPv4) Time() string {
return i.Timestamp
}
func (i IPv4Option) ToString() string {
var b strings.Builder
b.WriteString(Begin)
b.WriteString(formatInt32(i.OptionType))
b.WriteString(Separator)
b.WriteString(formatInt32(i.OptionLength))
b.WriteString(Separator)
b.WriteString(hex.EncodeToString(i.OptionData))
b.WriteString(End)
return b.String()
}
func (a IPv4) JSON() (string, error) {
return jsonMarshaler.MarshalToString(&a)
}
var (
ip4Metric = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: strings.ToLower(Type_NC_IPv4.String()),
Help: Type_NC_IPv4.String() + " audit records",
},
fieldsIPv4Metrics,
)
ip4PayloadEntropy = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: strings.ToLower(Type_NC_IPv4.String()) + "_entropy",
Help: Type_NC_IPv4.String() + " payload entropy",
Buckets: prometheus.LinearBuckets(20, 5, 5),
},
[]string{},
// []string{"SrcIP", "DstIP"},
)
ip4PayloadSize = prometheus.NewHistogramVec(
prometheus.HistogramOpts{
Name: strings.ToLower(Type_NC_IPv4.String()) + "_size",
Help: Type_NC_IPv4.String() + " payload sizes",
Buckets: prometheus.LinearBuckets(20, 5, 5),
},
[]string{},
// []string{"SrcIP", "DstIP"},
)
)
var fieldsIPv4Metrics = []string{
"Version", // int32
"IHL", // int32
"TOS", // int32
// "Length", // int32
// "Id", // int32
"Flags", // int32
"FragOffset", // int32
"TTL", // int32
"Protocol", // int32
"SrcIP", // string
"DstIP", // string
}
func (i IPv4) metricValues() []string {
return []string{
formatInt32(i.Version), // int32
formatInt32(i.IHL), // int32
formatInt32(i.TOS), // int32
// formatInt32(i.Length), // int32
// formatInt32(i.Id), // int32
formatInt32(i.Flags), // int32
formatInt32(i.FragOffset), // int32
formatInt32(i.TTL), // int32
formatInt32(i.Protocol), // int32
i.SrcIP, // string
i.DstIP, // string
}
}
func init() {
prometheus.MustRegister(ip4Metric)
prometheus.MustRegister(ip4PayloadEntropy)
prometheus.MustRegister(ip4PayloadSize)
}
func (a IPv4) Inc() {
ip4Metric.WithLabelValues(a.metricValues()...).Inc()
ip4PayloadEntropy.WithLabelValues().Observe(a.PayloadEntropy)
ip4PayloadSize.WithLabelValues().Observe(float64(a.PayloadSize))
}
func (a *IPv4) SetPacketContext(ctx *PacketContext) {
// create new context and only add information that is
// not yet present on the audit record type
a.Context = &PacketContext{
SrcPort: ctx.SrcPort,
DstPort: ctx.DstPort,
}
}
func (a IPv4) Src() string {
return a.SrcIP
}
func (a IPv4) Dst() string {
return a.DstIP
}