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dns.go
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dns.go
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/*
* NETCAP - Traffic Analysis Framework
* Copyright (c) 2017-2020 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 maltego
import (
"errors"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
"github.com/gogo/protobuf/proto"
"github.com/dreadl0ck/maltego"
"github.com/dreadl0ck/netcap/defaults"
"github.com/dreadl0ck/netcap/types"
)
// DNSCountFunc is a function that counts something over multiple DNS audit records.
//goland:noinspection GoUnnecessarilyExportedIdentifiers
type DNSCountFunc func()
// DNSTransformationFunc is a transformation over DNS audit records.
//goland:noinspection GoUnnecessarilyExportedIdentifiers
type DNSTransformationFunc = func(lt maltego.LocalTransform, trx *maltego.Transform, dns *types.DNS, min, max uint64, path string, ip string)
// DNSTransform applies a maltego transformation over DNS audit records.
func DNSTransform(count DNSCountFunc, transform DNSTransformationFunc, continueTransform bool) {
var (
lt = maltego.ParseLocalArguments(os.Args[3:])
path = strings.TrimPrefix(lt.Values["path"], "file://")
ipaddr = lt.Values[PropertyIpAddr]
trx = maltego.Transform{}
)
if !strings.HasPrefix(filepath.Base(path), "DNS.ncap") {
path = filepath.Join(filepath.Dir(path), "DNS.ncap.gz")
}
f, err := os.Open(path)
if err != nil {
log.Println(err)
fmt.Println(trx.ReturnOutput())
return
}
// check if its an audit record file
if !strings.HasSuffix(f.Name(), defaults.FileExtensionCompressed) && !strings.HasSuffix(f.Name(), defaults.FileExtension) {
maltego.Die(errUnexpectedFileType, f.Name())
}
r := openNetcapArchive(path)
// read netcap header
header, errFileHeader := r.ReadHeader()
if errFileHeader != nil {
maltego.Die("failed to read file header", errFileHeader.Error())
}
if header != nil && header.Type != types.Type_NC_DNS {
maltego.Die("file does not contain DNS records", header.Type.String())
}
var (
dns = new(types.DNS)
pm proto.Message
ok bool
)
pm = dns
if _, ok = pm.(types.AuditRecord); !ok {
panic("type does not implement types.AuditRecord interface")
}
var (
min uint64 = 10000000
max uint64 = 0
)
if count != nil {
for {
err = r.Next(dns)
if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
break
} else if err != nil {
maltego.Die(err.Error(), errUnexpectedReadFailure)
}
count()
}
err = r.Close()
if err != nil {
log.Println("failed to close audit record file: ", err)
}
}
r = openNetcapArchive(path)
// read netcap header - ignore err as it has been checked before
_, _ = r.ReadHeader()
for {
err = r.Next(dns)
if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
break
} else if err != nil {
panic(err)
}
transform(lt, &trx, dns, min, max, path, ipaddr)
}
err = r.Close()
if err != nil {
log.Println("failed to close audit record file: ", err)
}
if !continueTransform {
trx.AddUIMessage("completed!", maltego.UIMessageInform)
fmt.Println(trx.ReturnOutput())
}
}