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/* ipp-usb - HTTP reverse proxy, backed by IPP-over-USB connection to device
*
* Copyright (C) 2020 and up by Alexander Pevzner (pzz@apevzner.com)
* See LICENSE for license terms and conditions
*
* Loopback interface index discovery
*/
package main
import (
"errors"
"fmt"
"net"
)
// Loopback returns index of loopback interface
func Loopback() (int, error) {
interfaces, err := net.Interfaces()
if err == nil {
for _, iface := range interfaces {
if (iface.Flags & net.FlagLoopback) != 0 {
return iface.Index, nil
}
}
}
if err == nil {
err = errors.New("not found")
}
return 0, fmt.Errorf("Loopback discovery: %s", err)
}
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