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Recognize NetBird DNS forwarder port in capture text format

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This commit is contained in:
Viktor Liu
2026-05-16 16:45:38 +02:00
parent 347c5bf317
commit 014bcd22c5
1 changed files with 9 additions and 3 deletions
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12
util/capture/text.go
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@@ -13,6 +13,8 @@ import (
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/miekg/dns"
nbdns "github.com/netbirdio/netbird/dns"
)
// TextWriter writes human-readable one-line-per-packet summaries.
@@ -150,7 +152,7 @@ func (tw *TextWriter) writeUDP(timeStr string, dir Direction, info *packetInfo,
plen := len(udp.Payload)
// DNS replaces the entire line format
if plen > 0 && isDNSPort(info.srcPort, info.dstPort) {
if plen > 0 && (isDNSPort(info.srcPort) || isDNSPort(info.dstPort)) {
if s := formatDNSPayload(udp.Payload); s != "" {
var verbose string
if tw.verbose {
@@ -561,8 +563,12 @@ func findSNIExtension(body []byte, pos int) string {
return ""
}
func isDNSPort(src, dst uint16) bool {
return src == 53 || dst == 53 || src == 5353 || dst == 5353
func isDNSPort(p uint16) bool {
switch p {
case nbdns.DefaultDNSPort, nbdns.ForwarderClientPort, nbdns.ForwarderServerPort:
return true
}
return false
}
// formatDNSPayload parses DNS and returns a tcpdump-style summary.