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Fix UDP DNS buffer size

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世界 2025-07-12 22:53:01 +08:00
parent b3c11109e0
commit fc1d4e5ee8
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1 changed files with 8 additions and 4 deletions
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12
dns/transport/udp.go
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@ -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) { func (t *UDPTransport) exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
conn, err := t.open(ctx) t.access.Lock()
if err != nil {
return nil, err
}
if edns0Opt := message.IsEdns0(); edns0Opt != nil { if edns0Opt := message.IsEdns0(); edns0Opt != nil {
if udpSize := int(edns0Opt.UDPSize()); udpSize > t.udpSize { if udpSize := int(edns0Opt.UDPSize()); udpSize > t.udpSize {
t.udpSize = 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()) buffer := buf.NewSize(1 + message.Len())
defer buffer.Release() defer buffer.Release()
exMessage := *message exMessage := *message