mirror of
https://github.com/SagerNet/sing-box.git
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118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
package adapter
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import (
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"context"
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"net"
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"github.com/sagernet/sing/common/buf"
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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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)
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type (
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ConnectionHandler interface {
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NewConnection(ctx context.Context, conn net.Conn, metadata InboundContext) error
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}
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PacketHandler interface {
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NewPacket(ctx context.Context, conn N.PacketConn, buffer *buf.Buffer, metadata InboundContext) error
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}
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PacketConnectionHandler interface {
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NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata InboundContext) error
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}
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UpstreamHandlerAdapter interface {
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N.TCPConnectionHandler
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N.UDPConnectionHandler
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E.Handler
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}
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ConnectionHandlerFunc = func(ctx context.Context, conn net.Conn, metadata InboundContext) error
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PacketConnectionHandlerFunc = func(ctx context.Context, conn N.PacketConn, metadata InboundContext) error
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)
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func NewUpstreamHandler(
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metadata InboundContext,
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connectionHandler ConnectionHandlerFunc,
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packetHandler PacketConnectionHandlerFunc,
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errorHandler E.Handler,
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) UpstreamHandlerAdapter {
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return &myUpstreamHandlerWrapper{
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metadata: metadata,
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connectionHandler: connectionHandler,
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packetHandler: packetHandler,
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errorHandler: errorHandler,
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}
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}
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var _ UpstreamHandlerAdapter = (*myUpstreamHandlerWrapper)(nil)
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type myUpstreamHandlerWrapper struct {
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metadata InboundContext
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connectionHandler ConnectionHandlerFunc
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packetHandler PacketConnectionHandlerFunc
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errorHandler E.Handler
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}
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func (w *myUpstreamHandlerWrapper) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
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w.metadata.Destination = metadata.Destination
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return w.connectionHandler(ctx, conn, w.metadata)
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}
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func (w *myUpstreamHandlerWrapper) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
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w.metadata.Destination = metadata.Destination
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return w.packetHandler(ctx, conn, w.metadata)
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}
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func (w *myUpstreamHandlerWrapper) NewError(ctx context.Context, err error) {
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w.errorHandler.NewError(ctx, err)
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}
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var myContextType = (*MetadataContext)(nil)
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type MetadataContext struct {
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context.Context
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Metadata InboundContext
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}
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func (c *MetadataContext) Value(key any) any {
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if key == myContextType {
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return c
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}
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return c.Context.Value(key)
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}
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type myUpstreamContextHandlerWrapper struct {
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connectionHandler ConnectionHandlerFunc
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packetHandler PacketConnectionHandlerFunc
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errorHandler E.Handler
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}
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func NewUpstreamContextHandler(
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connectionHandler ConnectionHandlerFunc,
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packetHandler PacketConnectionHandlerFunc,
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errorHandler E.Handler,
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) UpstreamHandlerAdapter {
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return &myUpstreamContextHandlerWrapper{
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connectionHandler: connectionHandler,
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packetHandler: packetHandler,
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errorHandler: errorHandler,
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}
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}
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func (w *myUpstreamContextHandlerWrapper) NewConnection(ctx context.Context, conn net.Conn, metadata M.Metadata) error {
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myCtx := ctx.Value(myContextType).(*MetadataContext)
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ctx = myCtx.Context
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myCtx.Metadata.Destination = metadata.Destination
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return w.connectionHandler(ctx, conn, myCtx.Metadata)
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}
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func (w *myUpstreamContextHandlerWrapper) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
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myCtx := ctx.Value(myContextType).(*MetadataContext)
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ctx = myCtx.Context
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myCtx.Metadata.Destination = metadata.Destination
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return w.packetHandler(ctx, conn, myCtx.Metadata)
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}
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func (w *myUpstreamContextHandlerWrapper) NewError(ctx context.Context, err error) {
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w.errorHandler.NewError(ctx, err)
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}
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