package network import ( "encoding/json" "fmt" "io/ioutil" "sort" "strings" "github.com/containernetworking/cni/libcni" "github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator" "github.com/containers/common/pkg/config" "github.com/containers/podman/v2/libpod/define" "github.com/pkg/errors" ) // ErrNoSuchNetworkInterface indicates that no network interface exists var ErrNoSuchNetworkInterface = errors.New("unable to find interface name for network") // GetCNIConfDir get CNI configuration directory func GetCNIConfDir(configArg *config.Config) string { if len(configArg.Network.NetworkConfigDir) < 1 { dc, err := config.DefaultConfig() if err != nil { // Fallback to hard-coded dir return CNIConfigDir } return dc.Network.NetworkConfigDir } return configArg.Network.NetworkConfigDir } // LoadCNIConfsFromDir loads all the CNI configurations from a dir func LoadCNIConfsFromDir(dir string) ([]*libcni.NetworkConfigList, error) { files, err := libcni.ConfFiles(dir, []string{".conflist"}) if err != nil { return nil, err } sort.Strings(files) configs := make([]*libcni.NetworkConfigList, 0, len(files)) for _, confFile := range files { conf, err := libcni.ConfListFromFile(confFile) if err != nil { return nil, errors.Wrapf(err, "in %s", confFile) } configs = append(configs, conf) } return configs, nil } // GetCNIConfigPathByName finds a CNI network by name and // returns its configuration file path func GetCNIConfigPathByName(config *config.Config, name string) (string, error) { files, err := libcni.ConfFiles(GetCNIConfDir(config), []string{".conflist"}) if err != nil { return "", err } for _, confFile := range files { conf, err := libcni.ConfListFromFile(confFile) if err != nil { return "", errors.Wrapf(err, "in %s", confFile) } if conf.Name == name { return confFile, nil } } return "", errors.Wrap(define.ErrNoSuchNetwork, fmt.Sprintf("unable to find network configuration for %s", name)) } // ReadRawCNIConfByName reads the raw CNI configuration for a CNI // network by name func ReadRawCNIConfByName(config *config.Config, name string) ([]byte, error) { confFile, err := GetCNIConfigPathByName(config, name) if err != nil { return nil, err } b, err := ioutil.ReadFile(confFile) return b, err } // GetCNIPlugins returns a list of plugins that a given network // has in the form of a string func GetCNIPlugins(list *libcni.NetworkConfigList) string { plugins := make([]string, 0, len(list.Plugins)) for _, plug := range list.Plugins { plugins = append(plugins, plug.Network.Type) } return strings.Join(plugins, ",") } // GetNetworksFromFilesystem gets all the networks from the cni configuration // files func GetNetworksFromFilesystem(config *config.Config) ([]*allocator.Net, error) { var cniNetworks []*allocator.Net networks, err := LoadCNIConfsFromDir(GetCNIConfDir(config)) if err != nil { return nil, err } for _, n := range networks { for _, cniplugin := range n.Plugins { if cniplugin.Network.Type == "bridge" { ipamConf := allocator.Net{} if err := json.Unmarshal(cniplugin.Bytes, &ipamConf); err != nil { return nil, err } cniNetworks = append(cniNetworks, &ipamConf) break } } } return cniNetworks, nil } // GetNetworkNamesFromFileSystem gets all the names from the cni network // configuration files func GetNetworkNamesFromFileSystem(config *config.Config) ([]string, error) { networks, err := LoadCNIConfsFromDir(GetCNIConfDir(config)) if err != nil { return nil, err } networkNames := []string{} for _, n := range networks { networkNames = append(networkNames, n.Name) } return networkNames, nil } // GetInterfaceNameFromConfig returns the interface name for the bridge plugin func GetInterfaceNameFromConfig(path string) (string, error) { var name string conf, err := libcni.ConfListFromFile(path) if err != nil { return "", err } for _, cniplugin := range conf.Plugins { if cniplugin.Network.Type == "bridge" { plugin := make(map[string]interface{}) if err := json.Unmarshal(cniplugin.Bytes, &plugin); err != nil { return "", err } name = plugin["bridge"].(string) break } } if len(name) == 0 { return "", ErrNoSuchNetworkInterface } return name, nil } // GetBridgeNamesFromFileSystem is a convenience function to get all the bridge // names from the configured networks func GetBridgeNamesFromFileSystem(config *config.Config) ([]string, error) { networks, err := LoadCNIConfsFromDir(GetCNIConfDir(config)) if err != nil { return nil, err } bridgeNames := []string{} for _, n := range networks { var name string // iterate network conflists for _, cniplugin := range n.Plugins { // iterate plugins if cniplugin.Network.Type == "bridge" { plugin := make(map[string]interface{}) if err := json.Unmarshal(cniplugin.Bytes, &plugin); err != nil { continue } name = plugin["bridge"].(string) } } bridgeNames = append(bridgeNames, name) } return bridgeNames, nil }