88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
package dialer
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import (
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"context"
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"net"
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"net/netip"
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"time"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-dns"
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"github.com/sagernet/sing/common/bufio"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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)
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type ResolveDialer struct {
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dialer N.Dialer
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parallel bool
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router adapter.Router
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strategy dns.DomainStrategy
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fallbackDelay time.Duration
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}
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func NewResolveDialer(router adapter.Router, dialer N.Dialer, parallel bool, strategy dns.DomainStrategy, fallbackDelay time.Duration) *ResolveDialer {
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return &ResolveDialer{
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dialer,
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parallel,
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router,
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strategy,
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fallbackDelay,
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}
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}
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func (d *ResolveDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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if !destination.IsFqdn() {
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return d.dialer.DialContext(ctx, network, destination)
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}
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ctx, metadata := adapter.ExtendContext(ctx)
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ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
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metadata.Destination = destination
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metadata.Domain = ""
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var addresses []netip.Addr
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var err error
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if d.strategy == dns.DomainStrategyAsIS {
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addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
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} else {
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addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
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}
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if err != nil {
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return nil, err
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}
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if d.parallel {
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return N.DialParallel(ctx, d.dialer, network, destination, addresses, d.strategy == dns.DomainStrategyPreferIPv6, d.fallbackDelay)
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} else {
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return N.DialSerial(ctx, d.dialer, network, destination, addresses)
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}
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}
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func (d *ResolveDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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if !destination.IsFqdn() {
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return d.dialer.ListenPacket(ctx, destination)
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}
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ctx, metadata := adapter.ExtendContext(ctx)
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ctx = log.ContextWithOverrideLevel(ctx, log.LevelDebug)
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metadata.Destination = destination
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metadata.Domain = ""
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var addresses []netip.Addr
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var err error
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if d.strategy == dns.DomainStrategyAsIS {
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addresses, err = d.router.LookupDefault(ctx, destination.Fqdn)
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} else {
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addresses, err = d.router.Lookup(ctx, destination.Fqdn, d.strategy)
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}
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if err != nil {
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return nil, err
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}
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conn, destinationAddress, err := N.ListenSerial(ctx, d.dialer, destination, addresses)
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if err != nil {
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return nil, err
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}
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return bufio.NewNATPacketConn(bufio.NewPacketConn(conn), M.SocksaddrFrom(destinationAddress, destination.Port), destination), nil
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}
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func (d *ResolveDialer) Upstream() any {
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return d.dialer
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}
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