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Freedom: Cache UDP resolve result

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风扇滑翔翼 2025-06-10 15:41:29 +00:00 committed by GitHub
parent f38d3f786a
commit 3e2cec8727
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1 changed files with 17 additions and 5 deletions
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22
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.UDPAddr
}
func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
@ -364,13 +370,19 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
if w.UDPOverride.Port != 0 {
b.UDP.Port = w.UDPOverride.Port
}
if w.Handler.config.hasStrategy() && b.UDP.Address.Family().IsDomain() {
ip := w.Handler.resolveIP(w.Context, b.UDP.Address.Domain(), nil)
if ip != nil {
b.UDP.Address = ip
var destAddr *net.UDPAddr
if w.resolvedUDPAddr == nil {
if w.Handler.config.hasStrategy() && b.UDP.Address.Family().IsDomain() {
ip := w.Handler.resolveIP(w.Context, b.UDP.Address.Domain(), nil)
if ip != nil {
b.UDP.Address = ip
}
}
destAddr, _ = net.ResolveUDPAddr("udp", b.UDP.NetAddr())
w.resolvedUDPAddr[b.UDP.NetAddr()] = destAddr
} else {
destAddr = w.resolvedUDPAddr[b.UDP.NetAddr()]
}
destAddr, _ := net.ResolveUDPAddr("udp", b.UDP.NetAddr())
if destAddr == nil {
b.Release()
continue