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Add DNS support to pcap (#100)

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* begin adding dns pcap functionality

* improve question formatting

* work on capturing answers as well

* finalize DNS printing

* increase subfield limits

* add FlagContainer type

* prettier DNS printing
This commit is contained in:
Pat Whittingslow
2026-04-24 19:41:10 -03:00
committed by GitHub
parent b2c3d11c4c
commit 198db3789b
8 changed files with 401 additions and 23 deletions
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examples/xcurl/main.go
+3 -1
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@@ -136,9 +136,11 @@ func run() (err error) {
lastAction := time.Now()
buf := make([]byte, math.MaxUint16) // Generic-receive Offload (GRO) can aggregate packets.
var cap pcap.PacketBreakdown
cap.SubfieldLimit = 30 // For chunky DNS.
var frames []pcap.Frame
pf := pcap.Formatter{
FilterClasses: []pcap.FieldClass{pcap.FieldClassFlags, pcap.FieldClassOperation, pcap.FieldClassDst, pcap.FieldClassSrc, pcap.FieldClassAddress, pcap.FieldClassTimestamp},
FilterClasses: []pcap.FieldClass{pcap.FieldClassFlags, pcap.FieldClassOperation, pcap.FieldClassDst, pcap.FieldClassSrc, pcap.FieldClassAddress, pcap.FieldClassTimestamp, pcap.FieldClassDNSName},
SubfieldLimit: 30,
}
var pfbuf []byte
logFrames := func(context string, pkt []byte) error {