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Fix UDP DNS buffer size

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世界 2025-07-12 22:53:01 +08:00
parent ae2ecd6002
commit 5533094984
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GPG Key ID: CD109927C34A63C4
1 changed files with 9 additions and 5 deletions
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14
dns/transport/udp.go
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@ -60,7 +60,7 @@ func NewUDPRaw(logger logger.ContextLogger, adapter dns.TransportAdapter, dialer
logger: logger,
dialer: dialer,
serverAddr: serverAddr,
udpSize: 512,
udpSize: 2048,
tcpTransport: &TCPTransport{
dialer: dialer,
serverAddr: serverAddr,
@ -97,15 +97,19 @@ func (t *UDPTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.M
}
func (t *UDPTransport) exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
conn, err := t.open(ctx)
if err != nil {
return nil, err
}
t.access.Lock()
if edns0Opt := message.IsEdns0(); edns0Opt != nil {
if udpSize := int(edns0Opt.UDPSize()); udpSize > t.udpSize {
t.udpSize = udpSize
close(t.done)
t.done = make(chan struct{})
}
}
t.access.Unlock()
conn, err := t.open(ctx)
if err != nil {
return nil, err
}
buffer := buf.NewSize(1 + message.Len())
defer buffer.Release()
exMessage := *message