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utils.go
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utils.go
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package utils
import (
"fmt"
"net"
"regexp"
"strconv"
"strings"
"syscall"
"github.com/sirupsen/logrus"
)
var (
getCurrentKernelVersion = currentKernelVersion
log = logrus.WithField("component", "utils")
)
// GetSocket returns socket string in the correct format based on address family
func GetSocket(hostIP string, hostPort int) string {
socket := fmt.Sprintf("%s:%d", hostIP, hostPort)
ipAddr := net.ParseIP(hostIP)
if ipAddr != nil && ipAddr.To4() == nil {
socket = fmt.Sprintf("[%s]:%d", hostIP, hostPort)
}
return socket
}
func IskernelOlderthan514() bool {
kernelVersion514, err := kernelVersionFromReleaseString("5.14.0")
if err != nil {
log.Warnf("failed to get kernel version from release string: %v", err)
return false
}
currentVersion, err := getCurrentKernelVersion()
if err != nil {
log.Warnf("failed to get current kernel version: %v", err)
return false
}
if currentVersion < kernelVersion514 {
log.Infof("older kernel version not all hooks will be supported")
return true
}
return false
}
var versionRegex = regexp.MustCompile(`^(\d+)\.(\d+).(\d+).*$`)
// kernelVersionFromReleaseString converts a release string with format
// 4.4.2[-1] to a kernel version number in LINUX_VERSION_CODE format.
// That is, for kernel "a.b.c", the version number will be (a<<16 + b<<8 + c)
func kernelVersionFromReleaseString(releaseString string) (uint32, error) {
versionParts := versionRegex.FindStringSubmatch(releaseString)
if len(versionParts) != 4 {
return 0, fmt.Errorf("got invalid release version %q (expected format '4.3.2-1')", releaseString)
}
major, err := strconv.Atoi(versionParts[1])
if err != nil {
return 0, err
}
minor, err := strconv.Atoi(versionParts[2])
if err != nil {
return 0, err
}
patch, err := strconv.Atoi(versionParts[3])
if err != nil {
return 0, err
}
out := major*256*256 + minor*256 + patch
return uint32(out), nil
}
func currentKernelVersion() (uint32, error) {
var buf syscall.Utsname
if err := syscall.Uname(&buf); err != nil {
return 0, err
}
releaseString := strings.Trim(utsnameStr(buf.Release[:]), "\x00")
return kernelVersionFromReleaseString(releaseString)
}
func utsnameStr[T int8 | uint8](in []T) string {
out := make([]byte, len(in))
for i := 0; i < len(in); i++ {
if in[i] == 0 {
break
}
out = append(out, byte(in[i]))
}
return string(out)
}