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