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dns: Cleanup a bit

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This commit is contained in:
Mattias Wadman 2021-11-17 16:30:01 +01:00
parent 5d98a6949a
commit 3cea849101
1 changed files with 9 additions and 9 deletions
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18
format/dns/dns.go
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@ -1,6 +1,7 @@
package dns
// TODO: https://github.com/Forescout/namewreck/blob/main/rfc/draft-dashevskyi-dnsrr-antipatterns-00.txt
// https://datatracker.ietf.org/doc/html/rfc1035
// https://github.com/Forescout/namewreck/blob/main/rfc/draft-dashevskyi-dnsrr-antipatterns-00.txt
import (
"net"
@ -115,17 +116,17 @@ var rcodeNames = decode.UToScalar{
21: {Sym: "BADALG", Description: "Algorithm not supported"}, // RFC 2930
}
func decodeINAStr(d *decode.D) string {
func decodeAStr(d *decode.D) string {
return net.IP(d.BytesLen(4)).String()
}
func decodeINAAAAStr(d *decode.D) string {
func decodeAAAAStr(d *decode.D) string {
return net.IP(d.BytesLen(16)).String()
}
func fieldFormatLabel(d *decode.D, name string) {
var endPos int64
const maxJumps = 1000
const maxJumps = 100
jumpCount := 0
d.FieldStruct(name, func(d *decode.D) {
@ -172,16 +173,15 @@ func fieldFormatRR(d *decode.D, count uint64, name string, structName string) {
typ := d.FieldU16("type", d.MapUToStrSym(typeNames))
class := d.FieldU16("class", d.MapURangeToScalar(classNames))
d.FieldU32("ttl")
// TODO: pointer?
rdLength := d.FieldU16("rdlength")
switch {
case typ == typeCNAME:
fieldFormatLabel(d, "cname")
case typ == typeA && class == classIN:
d.FieldStrFn("address", decodeINAStr)
case typ == typeAAAA && class == classIN:
d.FieldStrFn("address", decodeINAAAAStr)
case class == classIN && typ == typeA:
d.FieldStrFn("address", decodeAStr)
case class == classIN && typ == typeAAAA:
d.FieldStrFn("address", decodeAAAAStr)
default:
d.FieldUTF8("rdata", int(rdLength))
}