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package speedtest
import (
"net"
"syscall"
"time"
"golang.org/x/sys/unix"
)
func newDialerInterfaceOrFwmarkBound(iface string, fwmark int) (dialer *net.Dialer, err error) {
// In linux there is the socket option SO_BINDTODEVICE.
// Therefore we can really bind the socket to the device instead of binding to the address that
// would be affected by the default routes.
control := func(network, address string, c syscall.RawConn) error {
var errSock error
err := c.Control((func(fd uintptr) {
if iface != "" {
errSock = unix.BindToDevice(int(fd), iface)
}
if fwmark > 0 {
errSock = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, fwmark)
}
}))
if err != nil {
return err
}
return errSock
}
dialer = &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
Control: control,
}
return dialer, nil
}
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