Example #1
0
// Runs "iptables --version" to get the version string
func getIptablesVersionString(exec utilexec.Interface) (string, error) {
	bytes, err := exec.Command("iptables", "--version").CombinedOutput()
	if err != nil {
		return "", err
	}

	return string(bytes), nil
}
Example #2
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
}
Example #3
0
func findPairInterfaceOfContainerInterface(e exec.Interface, containerPid int, containerInterfaceName string) (string, error) {
	nsenterPath, err := e.LookPath("nsenter")
	if err != nil {
		return "", err
	}
	ethtoolPath, err := e.LookPath("ethtool")
	if err != nil {
		return "", err
	}
	// Get container's interface index
	output, err := e.Command(nsenterPath, "-t", fmt.Sprintf("%d", containerPid), "-n", "-F", "--", ethtoolPath, "--statistics", containerInterfaceName).CombinedOutput()
	if err != nil {
		return "", fmt.Errorf("Unable to query interface %s of container %d: %v", containerInterfaceName, containerPid, err)
	}
	// look for peer_ifindex
	match := ethtoolOutputRegex.FindSubmatch(output)
	if match == nil {
		return "", fmt.Errorf("No peer_ifindex in interface statistics for %s of container %d", containerInterfaceName, containerPid)
	}
	peerIfIndex, err := strconv.Atoi(string(match[1]))
	if err != nil { // seems impossible (\d+ not numeric)
		return "", fmt.Errorf("peer_ifindex wasn't numeric: %s: %v", match[1], err)
	}
	iface, err := net.InterfaceByIndex(peerIfIndex)
	if err != nil {
		return "", err
	}
	return iface.Name, nil
}
Example #4
0
// NewProxier returns a new Proxier given an iptables Interface instance.
// Because of the iptables logic, it is assumed that there is only a single Proxier active on a machine.
// An error will be returned if iptables fails to update or acquire the initial lock.
// Once a proxier is created, it will keep iptables up to date in the background and
// will not terminate if a particular iptables call fails.
func NewProxier(ipt utiliptables.Interface, exec utilexec.Interface, syncPeriod time.Duration, masqueradeAll bool) (*Proxier, error) {
	// Set the route_localnet sysctl we need for
	if err := utilsysctl.SetSysctl(sysctlRouteLocalnet, 1); err != nil {
		return nil, fmt.Errorf("can't set sysctl %s: %v", sysctlRouteLocalnet, err)
	}

	// Load the module.  It's OK if this fails (e.g. the module is not present)
	// because we'll catch the error on the sysctl, which is what we actually
	// care about.
	exec.Command("modprobe", "br-netfilter").CombinedOutput()
	if err := utilsysctl.SetSysctl(sysctlBridgeCallIptables, 1); err != nil {
		glog.Warningf("can't set sysctl %s: %v", sysctlBridgeCallIptables, err)
	}

	return &Proxier{
		serviceMap:    make(map[proxy.ServicePortName]*serviceInfo),
		endpointsMap:  make(map[proxy.ServicePortName][]string),
		portsMap:      make(map[localPort]closeable),
		syncPeriod:    syncPeriod,
		iptables:      ipt,
		masqueradeAll: masqueradeAll,
	}, nil
}