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core/dnsserver: preserve UDP packet destination addresses (#8644)

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* core/dnsserver: preserve UDP packet destination addresses

Signed-off-by: houyuwushang <180804215+houyuwushang@users.noreply.github.com>

* test: modernize reverse UDP reply traversal

Signed-off-by: houyuwushang <180804215+houyuwushang@users.noreply.github.com>

* test: account for Unix IPv4 source-control capabilities

Signed-off-by: houyuwushang <180804215+houyuwushang@users.noreply.github.com>

---------

Signed-off-by: houyuwushang <180804215+houyuwushang@users.noreply.github.com>
This commit is contained in:
houyuwushang
2026-10-21 11:34:18 +08:00
committed by GitHub
parent e7f823b261
commit 0fe7b08fbb
12 changed files with 1026 additions and 3 deletions
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3
core/dnsserver/server.go
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@@ -240,6 +240,7 @@ func (s *Server) Serve(l net.Listener) error {
// ServePacket starts the server with an existing packetconn. It blocks until the server stops.
// This implements caddy.UDPServer interface.
func (s *Server) ServePacket(p net.PacketConn) error {
p = withUDPDestination(p)
// Use a custom writer decorator if one was configured.
var dw dns.DecorateWriter
if s.udpDecorateWriterFunc != nil {
@@ -249,7 +250,7 @@ func (s *Server) ServePacket(p net.PacketConn) error {
s.server[udp] = &dns.Server{PacketConn: p, Net: "udp", Handler: dns.HandlerFunc(func(w dns.ResponseWriter, r *dns.Msg) {
ctx := context.WithValue(context.Background(), Key{}, s)
ctx = context.WithValue(ctx, LoopKey{}, 0)
s.ServeDNS(ctx, w, r)
s.ServeDNS(ctx, withUDPLocalAddr(w), r)
}), TsigSecret: s.TsigSecret, MsgAcceptFunc: s.msgAcceptFunc(), DecorateWriter: dw}
s.m.Unlock()