1 files changed, 174 insertions, 0 deletions
diff --git a/libpod/network/files.go b/libpod/network/files.go
new file mode 100644
index 000000000..a2090491f
--- /dev/null
+++ b/libpod/network/files.go
@@ -0,0 +1,174 @@
+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"
+)
+
+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 "", errors.New("unable to find interface name for network")
+	}
+	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
+}