open-consul/agent/xds/net_linux.go

40 lines
748 B
Go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
//go:build linux
// +build linux
package xds
import (
"fmt"
"os"
"sync"
)
const ipv6SupportProcFile = "/proc/net/if_inet6"
var (
ipv6SupportOnce sync.Once
ipv6Supported bool
ipv6SupportedErr error
)
func kernelSupportsIPv6() (bool, error) {
ipv6SupportOnce.Do(func() {
ipv6Supported, ipv6SupportedErr = checkIfKernelSupportsIPv6()
})
return ipv6Supported, ipv6SupportedErr
}
func checkIfKernelSupportsIPv6() (bool, error) {
_, err := os.Stat(ipv6SupportProcFile)
if os.IsNotExist(err) {
return false, nil
} else if err != nil {
return false, fmt.Errorf("error checking for ipv6 support file %s: %w", ipv6SupportProcFile, err)
}
return true, nil
}