36 lines
661 B
Go
36 lines
661 B
Go
|
// +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
|
||
|
|
}
|