mirror of https://github.com/v2fly/v2ray-core.git
105 lines
3.2 KiB
Go
105 lines
3.2 KiB
Go
package internet
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import (
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"context"
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"runtime"
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"syscall"
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"github.com/pires/go-proxyproto"
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"github.com/v2fly/v2ray-core/v4/common/net"
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"github.com/v2fly/v2ray-core/v4/common/session"
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)
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var effectiveListener = DefaultListener{}
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type controller func(network, address string, fd uintptr) error
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type DefaultListener struct {
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controllers []controller
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}
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func getControlFunc(ctx context.Context, sockopt *SocketConfig, controllers []controller) func(network, address string, c syscall.RawConn) error {
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return func(network, address string, c syscall.RawConn) error {
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return c.Control(func(fd uintptr) {
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if sockopt != nil {
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if err := applyInboundSocketOptions(network, fd, sockopt); err != nil {
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newError("failed to apply socket options to incoming connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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setReusePort(fd) // nolint: staticcheck
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for _, controller := range controllers {
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if err := controller(network, address, fd); err != nil {
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newError("failed to apply external controller").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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})
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}
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}
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func (dl *DefaultListener) Listen(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (net.Listener, error) {
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var lc net.ListenConfig
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var l net.Listener
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var err error
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var network, address string
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switch addr := addr.(type) {
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case *net.TCPAddr:
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network = addr.Network()
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address = addr.String()
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lc.Control = getControlFunc(ctx, sockopt, dl.controllers)
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case *net.UnixAddr:
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lc.Control = nil
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network = addr.Network()
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address = addr.Name
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if (runtime.GOOS == "linux" || runtime.GOOS == "android") && address[0] == '@' {
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// linux abstract unix domain socket is lockfree
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if len(address) > 1 && address[1] == '@' {
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// but may need padding to work with haproxy
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fullAddr := make([]byte, len(syscall.RawSockaddrUnix{}.Path))
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copy(fullAddr, address[1:])
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address = string(fullAddr)
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}
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} else {
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// normal unix domain socket needs lock
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locker := &FileLocker{
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path: address + ".lock",
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}
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err := locker.Acquire()
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if err != nil {
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return nil, err
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}
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ctx = context.WithValue(ctx, address, locker) // nolint: golint,staticcheck
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}
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}
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l, err = lc.Listen(ctx, network, address)
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if sockopt != nil && sockopt.AcceptProxyProtocol {
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policyFunc := func(upstream net.Addr) (proxyproto.Policy, error) { return proxyproto.REQUIRE, nil }
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l = &proxyproto.Listener{Listener: l, Policy: policyFunc}
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}
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return l, err
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}
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func (dl *DefaultListener) ListenPacket(ctx context.Context, addr net.Addr, sockopt *SocketConfig) (net.PacketConn, error) {
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var lc net.ListenConfig
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lc.Control = getControlFunc(ctx, sockopt, dl.controllers)
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return lc.ListenPacket(ctx, addr.Network(), addr.String())
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}
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// RegisterListenerController adds a controller to the effective system listener.
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// The controller can be used to operate on file descriptors before they are put into use.
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//
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// v2ray:api:beta
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func RegisterListenerController(controller func(network, address string, fd uintptr) error) error {
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if controller == nil {
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return newError("nil listener controller")
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}
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effectiveListener.controllers = append(effectiveListener.controllers, controller)
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return nil
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}
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