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package network
import (
"encoding/json"
"net"
"os"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
"github.com/containers/common/pkg/config"
"github.com/containers/podman/v2/pkg/util"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// DefaultNetworkDriver is the default network type used
var DefaultNetworkDriver = "bridge"
// SupportedNetworkDrivers describes the list of supported drivers
var SupportedNetworkDrivers = []string{DefaultNetworkDriver}
// IsSupportedDriver checks if the user provided driver is supported
func IsSupportedDriver(driver string) error {
if util.StringInSlice(driver, SupportedNetworkDrivers) {
return nil
}
return errors.Errorf("driver '%s' is not supported", driver)
}
// GetLiveNetworks returns a slice of networks representing what the system
// has defined as network interfaces
func GetLiveNetworks() ([]*net.IPNet, error) {
addrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
nets := make([]*net.IPNet, 0, len(addrs))
for _, address := range addrs {
_, n, err := net.ParseCIDR(address.String())
if err != nil {
return nil, err
}
nets = append(nets, n)
}
return nets, nil
}
// GetLiveNetworkNames returns a list of network interfaces on the system
func GetLiveNetworkNames() ([]string, error) {
liveInterfaces, err := net.Interfaces()
if err != nil {
return nil, err
}
interfaceNames := make([]string, 0, len(liveInterfaces))
for _, i := range liveInterfaces {
interfaceNames = append(interfaceNames, i.Name)
}
return interfaceNames, nil
}
// GetFreeNetwork looks for a free network according to existing cni configuration
// files and network interfaces.
func GetFreeNetwork(config *config.Config) (*net.IPNet, error) {
networks, err := GetNetworksFromFilesystem(config)
if err != nil {
return nil, err
}
liveNetworks, err := GetLiveNetworks()
if err != nil {
return nil, err
}
nextNetwork, err := GetDefaultPodmanNetwork()
if err != nil {
return nil, err
}
logrus.Debugf("default network is %s", nextNetwork.String())
for {
newNetwork, err := NextSubnet(nextNetwork)
if err != nil {
return nil, err
}
logrus.Debugf("checking if network %s intersects with other cni networks", nextNetwork.String())
if intersectsConfig, _ := networkIntersectsWithNetworks(newNetwork, allocatorToIPNets(networks)); intersectsConfig {
logrus.Debugf("network %s is already being used by a cni configuration", nextNetwork.String())
nextNetwork = newNetwork
continue
}
logrus.Debugf("checking if network %s intersects with any network interfaces", nextNetwork.String())
if intersectsLive, _ := networkIntersectsWithNetworks(newNetwork, liveNetworks); !intersectsLive {
break
}
logrus.Debugf("network %s is being used by a network interface", nextNetwork.String())
nextNetwork = newNetwork
}
return nextNetwork, nil
}
func allocatorToIPNets(networks []*allocator.Net) []*net.IPNet {
var nets []*net.IPNet
for _, network := range networks {
if len(network.IPAM.Ranges) > 0 {
// this is the new IPAM range style
// append each subnet from ipam the rangeset
for _, r := range network.IPAM.Ranges[0] {
nets = append(nets, newIPNetFromSubnet(r.Subnet))
}
} else {
// looks like the old, deprecated style
nets = append(nets, newIPNetFromSubnet(network.IPAM.Subnet))
}
}
return nets
}
func newIPNetFromSubnet(subnet types.IPNet) *net.IPNet {
n := net.IPNet{
IP: subnet.IP,
Mask: subnet.Mask,
}
return &n
}
func networkIntersectsWithNetworks(n *net.IPNet, networklist []*net.IPNet) (bool, *net.IPNet) {
for _, nw := range networklist {
if networkIntersect(n, nw) {
return true, nw
}
}
return false, nil
}
func networkIntersect(n1, n2 *net.IPNet) bool {
return n2.Contains(n1.IP) || n1.Contains(n2.IP)
}
// ValidateUserNetworkIsAvailable returns via an error if a network is available
// to be used
func ValidateUserNetworkIsAvailable(config *config.Config, userNet *net.IPNet) error {
networks, err := GetNetworksFromFilesystem(config)
if err != nil {
return err
}
liveNetworks, err := GetLiveNetworks()
if err != nil {
return err
}
logrus.Debugf("checking if network %s exists in cni networks", userNet.String())
if intersectsConfig, _ := networkIntersectsWithNetworks(userNet, allocatorToIPNets(networks)); intersectsConfig {
return errors.Errorf("network %s is already being used by a cni configuration", userNet.String())
}
logrus.Debugf("checking if network %s exists in any network interfaces", userNet.String())
if intersectsLive, _ := networkIntersectsWithNetworks(userNet, liveNetworks); intersectsLive {
return errors.Errorf("network %s is being used by a network interface", userNet.String())
}
return nil
}
// RemoveNetwork removes a given network by name. If the network has container associated with it, that
// must be handled outside the context of this.
func RemoveNetwork(config *config.Config, name string) error {
cniPath, err := GetCNIConfigPathByName(config, name)
if err != nil {
return err
}
// Before we delete the configuration file, we need to make sure we can read and parse
// it to get the network interface name so we can remove that too
interfaceName, err := GetInterfaceNameFromConfig(cniPath)
if err != nil {
return errors.Wrapf(err, "failed to find network interface name in %q", cniPath)
}
liveNetworkNames, err := GetLiveNetworkNames()
if err != nil {
return errors.Wrapf(err, "failed to get live network names")
}
if util.StringInSlice(interfaceName, liveNetworkNames) {
if err := RemoveInterface(interfaceName); err != nil {
return errors.Wrapf(err, "failed to delete the network interface %q", interfaceName)
}
}
// Remove the configuration file
if err := os.Remove(cniPath); err != nil {
return errors.Wrapf(err, "failed to remove network configuration file %q", cniPath)
}
return nil
}
// InspectNetwork reads a CNI config and returns its configuration
func InspectNetwork(config *config.Config, name string) (map[string]interface{}, error) {
b, err := ReadRawCNIConfByName(config, name)
if err != nil {
return nil, err
}
rawList := make(map[string]interface{})
err = json.Unmarshal(b, &rawList)
return rawList, err
}
// Exists says whether a given network exists or not; it meant
// specifically for restful reponses so 404s can be used
func Exists(config *config.Config, name string) (bool, error) {
_, err := ReadRawCNIConfByName(config, name)
if err != nil {
if errors.Cause(err) == ErrNetworkNotFound {
return false, nil
}
return false, err
}
return true, nil
}
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