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listener.go
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listener.go
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// +build !windows
// +build !wasm
package domainsocket
import (
"context"
gotls "crypto/tls"
"os"
"strings"
"syscall"
"v2ray.com/core/common"
"v2ray.com/core/common/net"
"v2ray.com/core/transport/internet"
"v2ray.com/core/transport/internet/tls"
)
type Listener struct {
addr *net.UnixAddr
ln net.Listener
tlsConfig *gotls.Config
config *Config
addConn internet.ConnHandler
locker *fileLocker
}
func Listen(ctx context.Context, address net.Address, port net.Port, streamSettings *internet.MemoryStreamConfig, handler internet.ConnHandler) (internet.Listener, error) {
settings := streamSettings.ProtocolSettings.(*Config)
addr, err := settings.GetUnixAddr()
if err != nil {
return nil, err
}
unixListener, err := net.ListenUnix("unix", addr)
if err != nil {
return nil, newError("failed to listen domain socket").Base(err).AtWarning()
}
ln := &Listener{
addr: addr,
ln: unixListener,
config: settings,
addConn: handler,
}
if !settings.Abstract {
ln.locker = &fileLocker{
path: settings.Path + ".lock",
}
if err := ln.locker.Acquire(); err != nil {
unixListener.Close()
return nil, err
}
}
if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
ln.tlsConfig = config.GetTLSConfig()
}
go ln.run()
return ln, nil
}
func (ln *Listener) Addr() net.Addr {
return ln.addr
}
func (ln *Listener) Close() error {
if ln.locker != nil {
ln.locker.Release()
}
return ln.ln.Close()
}
func (ln *Listener) run() {
for {
conn, err := ln.ln.Accept()
if err != nil {
if strings.Contains(err.Error(), "closed") {
break
}
newError("failed to accepted raw connections").Base(err).AtWarning().WriteToLog()
continue
}
if ln.tlsConfig != nil {
conn = tls.Server(conn, ln.tlsConfig)
}
ln.addConn(internet.Connection(conn))
}
}
type fileLocker struct {
path string
file *os.File
}
func (fl *fileLocker) Acquire() error {
f, err := os.Create(fl.path)
if err != nil {
return err
}
if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX); err != nil {
f.Close()
return newError("failed to lock file: ", fl.path).Base(err)
}
fl.file = f
return nil
}
func (fl *fileLocker) Release() {
if err := syscall.Flock(int(fl.file.Fd()), syscall.LOCK_UN); err != nil {
newError("failed to unlock file: ", fl.path).Base(err).WriteToLog()
}
if err := fl.file.Close(); err != nil {
newError("failed to close file: ", fl.path).Base(err).WriteToLog()
}
if err := os.Remove(fl.path); err != nil {
newError("failed to remove file: ", fl.path).Base(err).WriteToLog()
}
}
func init() {
common.Must(internet.RegisterTransportListener(protocolName, Listen))
}