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Fix UDP conn stuck on sniff

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This change only avoids permanent hangs. We need to implement read deadlines for UDP conns in 1.10 for server inbounds.
This commit is contained in:
世界
2024-08-18 11:27:12 +08:00
parent 7fec8d842e
commit 21b1ac26b9
1 changed files with 45 additions and 22 deletions
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67
route/router.go
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@@ -951,34 +951,57 @@ func (r *Router) RoutePacketConnection(ctx context.Context, conn N.PacketConn, m
}*/
if metadata.InboundOptions.SniffEnabled || metadata.Destination.Addr.IsUnspecified() {
buffer := buf.NewPacket()
destination, err := conn.ReadPacket(buffer)
var (
buffer = buf.NewPacket()
destination M.Socksaddr
done = make(chan struct{})
err error
)
go func() {
sniffTimeout := C.ReadPayloadTimeout
if metadata.InboundOptions.SniffTimeout > 0 {
sniffTimeout = time.Duration(metadata.InboundOptions.SniffTimeout)
}
conn.SetReadDeadline(time.Now().Add(sniffTimeout))
destination, err = conn.ReadPacket(buffer)
conn.SetReadDeadline(time.Time{})
close(done)
}()
select {
case <-done:
case <-ctx.Done():
conn.Close()
return ctx.Err()
}
if err != nil {
buffer.Release()
return err
}
if metadata.Destination.Addr.IsUnspecified() {
metadata.Destination = destination
}
if metadata.InboundOptions.SniffEnabled {
sniffMetadata, _ := sniff.PeekPacket(ctx, buffer.Bytes(), sniff.DomainNameQuery, sniff.QUICClientHello, sniff.STUNMessage)
if sniffMetadata != nil {
metadata.Protocol = sniffMetadata.Protocol
metadata.Domain = sniffMetadata.Domain
if metadata.InboundOptions.SniffOverrideDestination && M.IsDomainName(metadata.Domain) {
metadata.Destination = M.Socksaddr{
Fqdn: metadata.Domain,
Port: metadata.Destination.Port,
if !errors.Is(err, os.ErrDeadlineExceeded) {
return err
}
} else {
if metadata.Destination.Addr.IsUnspecified() {
metadata.Destination = destination
}
if metadata.InboundOptions.SniffEnabled {
sniffMetadata, _ := sniff.PeekPacket(ctx, buffer.Bytes(), sniff.DomainNameQuery, sniff.QUICClientHello, sniff.STUNMessage)
if sniffMetadata != nil {
metadata.Protocol = sniffMetadata.Protocol
metadata.Domain = sniffMetadata.Domain
if metadata.InboundOptions.SniffOverrideDestination && M.IsDomainName(metadata.Domain) {
metadata.Destination = M.Socksaddr{
Fqdn: metadata.Domain,
Port: metadata.Destination.Port,
}
}
if metadata.Domain != "" {
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol, ", domain: ", metadata.Domain)
} else {
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol)
}
}
if metadata.Domain != "" {
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol, ", domain: ", metadata.Domain)
} else {
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol)
}
}
conn = bufio.NewCachedPacketConn(conn, buffer, destination)
}
conn = bufio.NewCachedPacketConn(conn, buffer, destination)
}
if r.dnsReverseMapping != nil && metadata.Domain == "" {
domain, loaded := r.dnsReverseMapping.Query(metadata.Destination.Addr)