sing-box/protocol/direct/outbound.go

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package direct
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import (
"context"
"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/adapter/outbound"
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"github.com/sagernet/sing-box/common/dialer"
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C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
dns "github.com/sagernet/sing-dns"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
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)
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func RegisterOutbound(registry *outbound.Registry) {
outbound.Register[option.DirectOutboundOptions](registry, C.TypeDirect, NewOutbound)
}
var _ N.ParallelDialer = (*Outbound)(nil)
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type Outbound struct {
outbound.Adapter
logger logger.ContextLogger
dialer N.Dialer
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domainStrategy dns.DomainStrategy
fallbackDelay time.Duration
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overrideOption int
overrideDestination M.Socksaddr
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// loopBack *loopBackDetector
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}
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func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.DirectOutboundOptions) (adapter.Outbound, error) {
options.UDPFragmentDefault = true
outboundDialer, err := dialer.New(ctx, options.DialerOptions)
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if err != nil {
return nil, err
}
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outbound := &Outbound{
Adapter: outbound.NewAdapterWithDialerOptions(C.TypeDirect, []string{N.NetworkTCP, N.NetworkUDP}, tag, options.DialerOptions),
logger: logger,
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domainStrategy: dns.DomainStrategy(options.DomainStrategy),
fallbackDelay: time.Duration(options.FallbackDelay),
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dialer: outboundDialer,
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// loopBack: newLoopBackDetector(router),
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}
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if options.ProxyProtocol != 0 {
return nil, E.New("Proxy Protocol is deprecated and removed in sing-box 1.6.0")
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}
if options.OverrideAddress != "" && options.OverridePort != 0 {
outbound.overrideOption = 1
outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverrideAddress != "" {
outbound.overrideOption = 2
outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverridePort != 0 {
outbound.overrideOption = 3
outbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
}
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return outbound, nil
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}
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func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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switch h.overrideOption {
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case 1:
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destination = h.overrideDestination
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case 2:
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newDestination := h.overrideDestination
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newDestination.Port = destination.Port
destination = newDestination
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case 3:
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destination.Port = h.overrideDestination.Port
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}
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network = N.NetworkName(network)
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switch network {
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case N.NetworkTCP:
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h.logger.InfoContext(ctx, "outbound connection to ", destination)
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case N.NetworkUDP:
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h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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}
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/*conn, err := h.dialer.DialContext(ctx, network, destination)
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if err != nil {
return nil, err
}
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return h.loopBack.NewConn(conn), nil*/
return h.dialer.DialContext(ctx, network, destination)
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}
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func (h *Outbound) DialParallel(ctx context.Context, network string, destination M.Socksaddr, destinationAddresses []netip.Addr) (net.Conn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
switch h.overrideOption {
case 1, 2:
// override address
return h.DialContext(ctx, network, destination)
case 3:
destination.Port = h.overrideDestination.Port
}
network = N.NetworkName(network)
switch network {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
var domainStrategy dns.DomainStrategy
if h.domainStrategy != dns.DomainStrategyAsIS {
domainStrategy = h.domainStrategy
} else {
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domainStrategy = dns.DomainStrategy(metadata.InboundOptions.DomainStrategy)
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}
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return N.DialParallel(ctx, h.dialer, network, destination, destinationAddresses, domainStrategy == dns.DomainStrategyPreferIPv6, h.fallbackDelay)
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}
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func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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ctx, metadata := adapter.ExtendContext(ctx)
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metadata.Outbound = h.Tag()
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metadata.Destination = destination
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originDestination := destination
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switch h.overrideOption {
case 1:
destination = h.overrideDestination
case 2:
newDestination := h.overrideDestination
newDestination.Port = destination.Port
destination = newDestination
case 3:
destination.Port = h.overrideDestination.Port
}
if h.overrideOption == 0 {
h.logger.InfoContext(ctx, "outbound packet connection")
} else {
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
conn, err := h.dialer.ListenPacket(ctx, destination)
if err != nil {
return nil, err
}
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// conn = h.loopBack.NewPacketConn(bufio.NewPacketConn(conn), destination)
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if originDestination != destination {
conn = bufio.NewNATPacketConn(bufio.NewPacketConn(conn), destination, originDestination)
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}
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return conn, nil
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}
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/*func (h *Outbound) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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if h.loopBack.CheckConn(metadata.Source.AddrPort(), M.AddrPortFromNet(conn.LocalAddr())) {
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return E.New("reject loopback connection to ", metadata.Destination)
}
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return NewConnection(ctx, h, conn, metadata)
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}
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func (h *Outbound) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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if h.loopBack.CheckPacketConn(metadata.Source.AddrPort(), M.AddrPortFromNet(conn.LocalAddr())) {
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return E.New("reject loopback packet connection to ", metadata.Destination)
}
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return NewPacketConnection(ctx, h, conn, metadata)
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}
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*/