Beispiel #1
0
// getIptablesVersionString runs "iptables --version" to get the version string
// in the form "X.X.X"
func getIptablesVersionString(exec utilexec.Interface) (string, error) {
	// this doesn't access mutable state so we don't need to use the interface / runner
	bytes, err := exec.Command(cmdIptables, "--version").CombinedOutput()
	if err != nil {
		return "", err
	}
	versionMatcher := regexp.MustCompile("v([0-9]+\\.[0-9]+\\.[0-9]+)")
	match := versionMatcher.FindStringSubmatch(string(bytes))
	if match == nil {
		return "", fmt.Errorf("no iptables version found in string: %s", bytes)
	}
	return match[1], nil
}
Beispiel #2
0
func getOnePodIP(execer utilexec.Interface, nsenterPath, netnsPath, interfaceName, addrType string) (net.IP, error) {
	// Try to retrieve ip inside container network namespace
	output, err := execer.Command(nsenterPath, fmt.Sprintf("--net=%s", netnsPath), "-F", "--",
		"ip", "-o", addrType, "addr", "show", "dev", interfaceName, "scope", "global").CombinedOutput()
	if err != nil {
		return nil, fmt.Errorf("Unexpected command output %s with error: %v", output, err)
	}

	lines := strings.Split(string(output), "\n")
	if len(lines) < 1 {
		return nil, fmt.Errorf("Unexpected command output %s", output)
	}
	fields := strings.Fields(lines[0])
	if len(fields) < 4 {
		return nil, fmt.Errorf("Unexpected address output %s ", lines[0])
	}
	ip, _, err := net.ParseCIDR(fields[3])
	if err != nil {
		return nil, fmt.Errorf("CNI failed to parse ip from output %s due to %v", output, err)
	}

	return ip, nil
}