mirror of
https://github.com/SagerNet/sing-box.git
synced 2025-01-30 20:56:54 +00:00
102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
package dns
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import (
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"context"
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"net"
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"time"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/dialer"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/option"
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E "github.com/sagernet/sing/common/exceptions"
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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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"github.com/sagernet/sing/service"
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)
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func NewLocalDialer(ctx context.Context, options option.LocalDNSServerOptions) (N.Dialer, error) {
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if options.LegacyDefaultDialer {
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return dialer.NewDefaultOutbound(ctx), nil
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} else {
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return dialer.New(ctx, options.DialerOptions, false)
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}
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}
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func NewRemoteDialer(ctx context.Context, options option.RemoteDNSServerOptions) (N.Dialer, error) {
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var (
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transportDialer N.Dialer
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err error
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)
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if options.LegacyDefaultDialer {
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transportDialer = dialer.NewDefaultOutbound(ctx)
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} else {
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transportDialer, err = dialer.New(ctx, options.DialerOptions, options.ServerIsDomain())
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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 options.AddressResolver != "" {
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transport := service.FromContext[adapter.DNSTransportManager](ctx)
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resolverTransport, loaded := transport.Transport(options.AddressResolver)
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if !loaded {
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return nil, E.New("address resolver not found: ", options.AddressResolver)
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}
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transportDialer = NewTransportDialer(transportDialer, service.FromContext[adapter.DNSRouter](ctx), resolverTransport, C.DomainStrategy(options.AddressStrategy), time.Duration(options.AddressFallbackDelay))
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} else if options.ServerIsDomain() {
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return nil, E.New("missing address resolver for server: ", options.Server)
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}
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return transportDialer, nil
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}
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type TransportDialer struct {
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dialer N.Dialer
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dnsRouter adapter.DNSRouter
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transport adapter.DNSTransport
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strategy C.DomainStrategy
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fallbackDelay time.Duration
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}
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func NewTransportDialer(dialer N.Dialer, dnsRouter adapter.DNSRouter, transport adapter.DNSTransport, strategy C.DomainStrategy, fallbackDelay time.Duration) *TransportDialer {
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return &TransportDialer{
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dialer,
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dnsRouter,
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transport,
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strategy,
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fallbackDelay,
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}
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}
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func (d *TransportDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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if destination.IsIP() {
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return d.dialer.DialContext(ctx, network, destination)
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}
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addresses, err := d.dnsRouter.Lookup(ctx, destination.Fqdn, adapter.DNSQueryOptions{
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Transport: d.transport,
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Strategy: 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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return N.DialParallel(ctx, d.dialer, network, destination, addresses, d.strategy == C.DomainStrategyPreferIPv6, d.fallbackDelay)
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}
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func (d *TransportDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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if destination.IsIP() {
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return d.dialer.ListenPacket(ctx, destination)
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}
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addresses, err := d.dnsRouter.Lookup(ctx, destination.Fqdn, adapter.DNSQueryOptions{
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Transport: d.transport,
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Strategy: 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, _, err := N.ListenSerial(ctx, d.dialer, destination, addresses)
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return conn, err
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}
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func (d *TransportDialer) Upstream() any {
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return d.dialer
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}
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