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gre.go
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gre.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 fieldsGRE = []string{
"Timestamp",
"ChecksumPresent", // bool
"RoutingPresent", // bool
"KeyPresent", // bool
"SeqPresent", // bool
"StrictSourceRoute", // bool
"AckPresent", // bool
"RecursionControl", // int32
"Flags", // int32
"Version", // int32
"Protocol", // int32
"Checksum", // int32
"Offset", // int32
"Key", // uint32
"Seq", // uint32
"Ack", // uint32
"Routing", // *GRERouting
"SrcIP",
"DstIP",
"SrcPort",
"DstPort",
}
func (a GRE) CSVHeader() []string {
return filter(fieldsGRE)
}
func (a GRE) CSVRecord() []string {
return filter([]string{
formatTimestamp(a.Timestamp),
strconv.FormatBool(a.ChecksumPresent), // bool
strconv.FormatBool(a.RoutingPresent), // bool
strconv.FormatBool(a.KeyPresent), // bool
strconv.FormatBool(a.SeqPresent), // bool
strconv.FormatBool(a.StrictSourceRoute), // bool
strconv.FormatBool(a.AckPresent), // bool
formatInt32(a.RecursionControl), // int32
formatInt32(a.Flags), // int32
formatInt32(a.Version), // int32
formatInt32(a.Protocol), // int32
formatInt32(a.Checksum), // int32
formatInt32(a.Offset), // int32
formatUint32(a.Key), // uint32
formatUint32(a.Seq), // uint32
formatUint32(a.Ack), // uint32
a.Routing.GetString(), // *GRERouting
a.Context.SrcIP,
a.Context.DstIP,
a.Context.SrcPort,
a.Context.DstPort,
})
}
func (a GRE) NetcapTimestamp() string {
return a.Timestamp
}
func (r *GRERouting) GetString() string {
if r == nil {
return ""
}
var b strings.Builder
b.WriteString(Begin)
b.WriteString(formatInt32(r.AddressFamily))
b.WriteString(Separator)
b.WriteString(formatInt32(r.SREOffset))
b.WriteString(Separator)
b.WriteString(formatInt32(r.SRELength))
b.WriteString(Separator)
b.WriteString(hex.EncodeToString(r.RoutingInformation))
b.WriteString(Separator)
b.WriteString(r.Next.GetString())
b.WriteString(End)
return b.String()
}
func (a GRE) JSON() (string, error) {
return jsonMarshaler.MarshalToString(&a)
}
var greMetric = prometheus.NewCounterVec(
prometheus.CounterOpts{
Name: strings.ToLower(Type_NC_GRE.String()),
Help: Type_NC_GRE.String() + " audit records",
},
fieldsGRE[1:],
)
func init() {
prometheus.MustRegister(greMetric)
}
func (a GRE) Inc() {
greMetric.WithLabelValues(a.CSVRecord()[1:]...).Inc()
}
func (a *GRE) SetPacketContext(ctx *PacketContext) {
a.Context = ctx
}