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Freedom: Cache UDP resolve result

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风扇滑翔翼 2025-06-10 17:24:53 +00:00 • committed by GitHub
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commit 8edf471c9f
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11
proxy/freedom/freedom.go
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@ -346,6 +346,12 @@ type PacketWriter struct {
*Handler
context.Context
UDPOverride net.Destination
// Dest of udp packets might be a domain, we will resolve them to IP
// But resolver will return a random one if the domain has many IPs
// Resulting in these packets being sent to many different IPs randomly
// So, cache and keep the resolve result
resolvedUDPAddr map[string]net.Address
}
func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
@ -365,9 +371,14 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
b.UDP.Port = w.UDPOverride.Port
}
if w.Handler.config.hasStrategy() && b.UDP.Address.Family().IsDomain() {
if ip := w.resolvedUDPAddr[b.UDP.Address.Domain()]; ip != nil {
b.UDP.Address = ip
}
} else {
ip := w.Handler.resolveIP(w.Context, b.UDP.Address.Domain(), nil)
if ip != nil {
b.UDP.Address = ip
w.resolvedUDPAddr[b.UDP.Address.Domain()] = ip
}
}
destAddr, _ := net.ResolveUDPAddr("udp", b.UDP.NetAddr())