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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
}
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