v2ray-core/transport/internet/internal/sysfd.go

26 lines
507 B
Go

package internal
import (
"net"
"reflect"
)
var (
errInvalidConn = newError("Invalid Connection.")
)
// GetSysFd returns the underlying fd of a connection.
func GetSysFd(conn net.Conn) (int, error) {
cv := reflect.ValueOf(conn)
switch ce := cv.Elem(); ce.Kind() {
case reflect.Struct:
netfd := ce.FieldByName("conn").FieldByName("fd")
switch fe := netfd.Elem(); fe.Kind() {
case reflect.Struct:
fd := fe.FieldByName("sysfd")
return int(fd.Int()), nil
}
}
return 0, errInvalidConn
}