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