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-rw-r--r--vendor/github.com/cri-o/ocicni/LICENSE191
-rw-r--r--vendor/github.com/cri-o/ocicni/README.md3
-rw-r--r--vendor/github.com/cri-o/ocicni/pkg/ocicni/noop.go24
-rw-r--r--vendor/github.com/cri-o/ocicni/pkg/ocicni/ocicni.go421
-rw-r--r--vendor/github.com/cri-o/ocicni/pkg/ocicni/types.go62
-rw-r--r--vendor/github.com/cri-o/ocicni/pkg/ocicni/util.go32
6 files changed, 733 insertions, 0 deletions
diff --git a/vendor/github.com/cri-o/ocicni/LICENSE b/vendor/github.com/cri-o/ocicni/LICENSE
new file mode 100644
index 000000000..3fd703072
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/LICENSE
@@ -0,0 +1,191 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
+ and distribution as defined by Sections 1 through 9 of this document.
+
+ "Licensor" shall mean the copyright owner or entity authorized by
+ the copyright owner that is granting the License.
+
+ "Legal Entity" shall mean the union of the acting entity and all
+ other entities that control, are controlled by, or are under common
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+ otherwise, or (ii) ownership of fifty percent (50%) or more of the
+ outstanding shares, or (iii) beneficial ownership of such entity.
+
+ "You" (or "Your") shall mean an individual or Legal Entity
+ exercising permissions granted by this License.
+
+ "Source" form shall mean the preferred form for making modifications,
+ including but not limited to software source code, documentation
+ source, and configuration files.
+
+ "Object" form shall mean any form resulting from mechanical
+ transformation or translation of a Source form, including but
+ not limited to compiled object code, generated documentation,
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+
+ "Work" shall mean the work of authorship, whether in Source or
+ Object form, made available under the License, as indicated by a
+ copyright notice that is included in or attached to the work
+ (an example is provided in the Appendix below).
+
+ "Derivative Works" shall mean any work, whether in Source or Object
+ form, that is based on (or derived from) the Work and for which the
+ editorial revisions, annotations, elaborations, or other modifications
+ represent, as a whole, an original work of authorship. For the purposes
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+ separable from, or merely link (or bind by name) to the interfaces of,
+ the Work and Derivative Works thereof.
+
+ "Contribution" shall mean any work of authorship, including
+ the original version of the Work and any modifications or additions
+ to that Work or Derivative Works thereof, that is intentionally
+ submitted to Licensor for inclusion in the Work by the copyright owner
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+ communication on electronic mailing lists, source code control systems,
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+ on behalf of whom a Contribution has been received by Licensor and
+ subsequently incorporated within the Work.
+
+ 2. Grant of Copyright License. Subject to the terms and conditions of
+ this License, each Contributor hereby grants to You a perpetual,
+ worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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+ (except as stated in this section) patent license to make, have made,
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+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
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+ the terms of any separate license agreement you may have executed
+ with Licensor regarding such Contributions.
+
+ 6. Trademarks. This License does not grant permission to use the trade
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+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ implied, including, without limitation, any warranties or conditions
+ of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+ PARTICULAR PURPOSE. You are solely responsible for determining the
+ appropriateness of using or redistributing the Work and assume any
+ risks associated with Your exercise of permissions under this License.
+
+ 8. Limitation of Liability. In no event and under no legal theory,
+ whether in tort (including negligence), contract, or otherwise,
+ unless required by applicable law (such as deliberate and grossly
+ negligent acts) or agreed to in writing, shall any Contributor be
+ liable to You for damages, including any direct, indirect, special,
+ incidental, or consequential damages of any character arising as a
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+ Work (including but not limited to damages for loss of goodwill,
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+ other commercial damages or losses), even if such Contributor
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+ 9. Accepting Warranty or Additional Liability. While redistributing
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+ of any other Contributor, and only if You agree to indemnify,
+ defend, and hold each Contributor harmless for any liability
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+
+ END OF TERMS AND CONDITIONS
+
+ Copyright 2016 Red Hat, Inc.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
diff --git a/vendor/github.com/cri-o/ocicni/README.md b/vendor/github.com/cri-o/ocicni/README.md
new file mode 100644
index 000000000..99c103c83
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/README.md
@@ -0,0 +1,3 @@
+# ocicni
+
+API layer to call the CNI plugins from an OCI lifecycle daemon
diff --git a/vendor/github.com/cri-o/ocicni/pkg/ocicni/noop.go b/vendor/github.com/cri-o/ocicni/pkg/ocicni/noop.go
new file mode 100644
index 000000000..9f315a7c6
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/pkg/ocicni/noop.go
@@ -0,0 +1,24 @@
+package ocicni
+
+type cniNoOp struct {
+}
+
+func (noop *cniNoOp) Name() string {
+ return "CNINoOp"
+}
+
+func (noop *cniNoOp) SetUpPod(network PodNetwork) error {
+ return nil
+}
+
+func (noop *cniNoOp) TearDownPod(network PodNetwork) error {
+ return nil
+}
+
+func (noop *cniNoOp) GetPodNetworkStatus(network PodNetwork) (string, error) {
+ return "", nil
+}
+
+func (noop *cniNoOp) Status() error {
+ return nil
+}
diff --git a/vendor/github.com/cri-o/ocicni/pkg/ocicni/ocicni.go b/vendor/github.com/cri-o/ocicni/pkg/ocicni/ocicni.go
new file mode 100644
index 000000000..03918bfa4
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/pkg/ocicni/ocicni.go
@@ -0,0 +1,421 @@
+package ocicni
+
+import (
+ "errors"
+ "fmt"
+ "os/exec"
+ "sort"
+ "strings"
+ "sync"
+
+ "github.com/containernetworking/cni/libcni"
+ cnitypes "github.com/containernetworking/cni/pkg/types"
+ "github.com/fsnotify/fsnotify"
+ "github.com/sirupsen/logrus"
+)
+
+type cniNetworkPlugin struct {
+ loNetwork *cniNetwork
+
+ sync.RWMutex
+ defaultNetwork *cniNetwork
+
+ nsenterPath string
+ pluginDir string
+ cniDirs []string
+ vendorCNIDirPrefix string
+
+ monitorNetDirChan chan struct{}
+
+ // The pod map provides synchronization for a given pod's network
+ // operations. Each pod's setup/teardown/status operations
+ // are synchronized against each other, but network operations of other
+ // pods can proceed in parallel.
+ podsLock sync.Mutex
+ pods map[string]*podLock
+}
+
+type cniNetwork struct {
+ name string
+ NetworkConfig *libcni.NetworkConfigList
+ CNIConfig libcni.CNI
+}
+
+var errMissingDefaultNetwork = errors.New("Missing CNI default network")
+
+type podLock struct {
+ // Count of in-flight operations for this pod; when this reaches zero
+ // the lock can be removed from the pod map
+ refcount uint
+
+ // Lock to synchronize operations for this specific pod
+ mu sync.Mutex
+}
+
+func buildFullPodName(podNetwork PodNetwork) string {
+ return podNetwork.Namespace + "_" + podNetwork.Name
+}
+
+// Lock network operations for a specific pod. If that pod is not yet in
+// the pod map, it will be added. The reference count for the pod will
+// be increased.
+func (plugin *cniNetworkPlugin) podLock(podNetwork PodNetwork) *sync.Mutex {
+ plugin.podsLock.Lock()
+ defer plugin.podsLock.Unlock()
+
+ fullPodName := buildFullPodName(podNetwork)
+ lock, ok := plugin.pods[fullPodName]
+ if !ok {
+ lock = &podLock{}
+ plugin.pods[fullPodName] = lock
+ }
+ lock.refcount++
+ return &lock.mu
+}
+
+// Unlock network operations for a specific pod. The reference count for the
+// pod will be decreased. If the reference count reaches zero, the pod will be
+// removed from the pod map.
+func (plugin *cniNetworkPlugin) podUnlock(podNetwork PodNetwork) {
+ plugin.podsLock.Lock()
+ defer plugin.podsLock.Unlock()
+
+ fullPodName := buildFullPodName(podNetwork)
+ lock, ok := plugin.pods[fullPodName]
+ if !ok {
+ logrus.Warningf("Unbalanced pod lock unref for %s", fullPodName)
+ return
+ } else if lock.refcount == 0 {
+ // This should never ever happen, but handle it anyway
+ delete(plugin.pods, fullPodName)
+ logrus.Errorf("Pod lock for %s still in map with zero refcount", fullPodName)
+ return
+ }
+ lock.refcount--
+ lock.mu.Unlock()
+ if lock.refcount == 0 {
+ delete(plugin.pods, fullPodName)
+ }
+}
+
+func (plugin *cniNetworkPlugin) monitorNetDir() {
+ watcher, err := fsnotify.NewWatcher()
+ if err != nil {
+ logrus.Errorf("could not create new watcher %v", err)
+ return
+ }
+ defer watcher.Close()
+
+ go func() {
+ for {
+ select {
+ case event := <-watcher.Events:
+ logrus.Debugf("CNI monitoring event %v", event)
+ if event.Op&fsnotify.Create != fsnotify.Create &&
+ event.Op&fsnotify.Write != fsnotify.Write {
+ continue
+ }
+
+ if err = plugin.syncNetworkConfig(); err == nil {
+ logrus.Infof("CNI asynchronous setting succeeded")
+ continue
+ }
+
+ logrus.Errorf("CNI setting failed, continue monitoring: %v", err)
+
+ case err := <-watcher.Errors:
+ logrus.Errorf("CNI monitoring error %v", err)
+ close(plugin.monitorNetDirChan)
+ return
+ }
+ }
+ }()
+
+ if err = watcher.Add(plugin.pluginDir); err != nil {
+ logrus.Error(err)
+ return
+ }
+
+ <-plugin.monitorNetDirChan
+}
+
+// InitCNI takes the plugin directory and cni directories where the cni files should be searched for
+// Returns a valid plugin object and any error
+func InitCNI(pluginDir string, cniDirs ...string) (CNIPlugin, error) {
+ plugin := probeNetworkPluginsWithVendorCNIDirPrefix(pluginDir, cniDirs, "")
+ var err error
+ plugin.nsenterPath, err = exec.LookPath("nsenter")
+ if err != nil {
+ return nil, err
+ }
+
+ // check if a default network exists, otherwise dump the CNI search and return a noop plugin
+ _, err = getDefaultCNINetwork(plugin.pluginDir, plugin.cniDirs, plugin.vendorCNIDirPrefix)
+ if err != nil {
+ if err != errMissingDefaultNetwork {
+ logrus.Warningf("Error in finding usable CNI plugin - %v", err)
+ // create a noop plugin instead
+ return &cniNoOp{}, nil
+ }
+
+ // We do not have a default network, we start the monitoring thread.
+ go plugin.monitorNetDir()
+ }
+
+ return plugin, nil
+}
+
+func probeNetworkPluginsWithVendorCNIDirPrefix(pluginDir string, cniDirs []string, vendorCNIDirPrefix string) *cniNetworkPlugin {
+ plugin := &cniNetworkPlugin{
+ defaultNetwork: nil,
+ loNetwork: getLoNetwork(cniDirs, vendorCNIDirPrefix),
+ pluginDir: pluginDir,
+ cniDirs: cniDirs,
+ vendorCNIDirPrefix: vendorCNIDirPrefix,
+ monitorNetDirChan: make(chan struct{}),
+ pods: make(map[string]*podLock),
+ }
+
+ // sync NetworkConfig in best effort during probing.
+ if err := plugin.syncNetworkConfig(); err != nil {
+ logrus.Error(err)
+ }
+ return plugin
+}
+
+func getDefaultCNINetwork(pluginDir string, cniDirs []string, vendorCNIDirPrefix string) (*cniNetwork, error) {
+ if pluginDir == "" {
+ pluginDir = DefaultNetDir
+ }
+ if len(cniDirs) == 0 {
+ cniDirs = []string{DefaultCNIDir}
+ }
+
+ files, err := libcni.ConfFiles(pluginDir, []string{".conf", ".conflist", ".json"})
+ switch {
+ case err != nil:
+ return nil, err
+ case len(files) == 0:
+ return nil, errMissingDefaultNetwork
+ }
+
+ sort.Strings(files)
+ for _, confFile := range files {
+ var confList *libcni.NetworkConfigList
+ if strings.HasSuffix(confFile, ".conflist") {
+ confList, err = libcni.ConfListFromFile(confFile)
+ if err != nil {
+ logrus.Warningf("Error loading CNI config list file %s: %v", confFile, err)
+ continue
+ }
+ } else {
+ conf, err := libcni.ConfFromFile(confFile)
+ if err != nil {
+ logrus.Warningf("Error loading CNI config file %s: %v", confFile, err)
+ continue
+ }
+ if conf.Network.Type == "" {
+ logrus.Warningf("Error loading CNI config file %s: no 'type'; perhaps this is a .conflist?", confFile)
+ continue
+ }
+ confList, err = libcni.ConfListFromConf(conf)
+ if err != nil {
+ logrus.Warningf("Error converting CNI config file %s to list: %v", confFile, err)
+ continue
+ }
+ }
+ if len(confList.Plugins) == 0 {
+ logrus.Warningf("CNI config list %s has no networks, skipping", confFile)
+ continue
+ }
+ logrus.Infof("CNI network %s (type=%v) is used from %s", confList.Name, confList.Plugins[0].Network.Type, confFile)
+ // Search for vendor-specific plugins as well as default plugins in the CNI codebase.
+ vendorDir := vendorCNIDir(vendorCNIDirPrefix, confList.Plugins[0].Network.Type)
+ cninet := &libcni.CNIConfig{
+ Path: append(cniDirs, vendorDir),
+ }
+ network := &cniNetwork{name: confList.Name, NetworkConfig: confList, CNIConfig: cninet}
+ return network, nil
+ }
+ return nil, fmt.Errorf("No valid networks found in %s", pluginDir)
+}
+
+func vendorCNIDir(prefix, pluginType string) string {
+ return fmt.Sprintf(VendorCNIDirTemplate, prefix, pluginType)
+}
+
+func getLoNetwork(cniDirs []string, vendorDirPrefix string) *cniNetwork {
+ if len(cniDirs) == 0 {
+ cniDirs = []string{DefaultCNIDir}
+ }
+
+ loConfig, err := libcni.ConfListFromBytes([]byte(`{
+ "cniVersion": "0.2.0",
+ "name": "cni-loopback",
+ "plugins": [{
+ "type": "loopback"
+ }]
+}`))
+ if err != nil {
+ // The hardcoded config above should always be valid and unit tests will
+ // catch this
+ panic(err)
+ }
+ vendorDir := vendorCNIDir(vendorDirPrefix, loConfig.Plugins[0].Network.Type)
+ cninet := &libcni.CNIConfig{
+ Path: append(cniDirs, vendorDir),
+ }
+ loNetwork := &cniNetwork{
+ name: "lo",
+ NetworkConfig: loConfig,
+ CNIConfig: cninet,
+ }
+
+ return loNetwork
+}
+
+func (plugin *cniNetworkPlugin) syncNetworkConfig() error {
+ network, err := getDefaultCNINetwork(plugin.pluginDir, plugin.cniDirs, plugin.vendorCNIDirPrefix)
+ if err != nil {
+ logrus.Errorf("error updating cni config: %s", err)
+ return err
+ }
+ plugin.setDefaultNetwork(network)
+
+ return nil
+}
+
+func (plugin *cniNetworkPlugin) getDefaultNetwork() *cniNetwork {
+ plugin.RLock()
+ defer plugin.RUnlock()
+ return plugin.defaultNetwork
+}
+
+func (plugin *cniNetworkPlugin) setDefaultNetwork(n *cniNetwork) {
+ plugin.Lock()
+ defer plugin.Unlock()
+ plugin.defaultNetwork = n
+}
+
+func (plugin *cniNetworkPlugin) checkInitialized() error {
+ if plugin.getDefaultNetwork() == nil {
+ return errors.New("cni config uninitialized")
+ }
+ return nil
+}
+
+func (plugin *cniNetworkPlugin) Name() string {
+ return CNIPluginName
+}
+
+func (plugin *cniNetworkPlugin) SetUpPod(podNetwork PodNetwork) error {
+ if err := plugin.checkInitialized(); err != nil {
+ return err
+ }
+
+ plugin.podLock(podNetwork).Lock()
+ defer plugin.podUnlock(podNetwork)
+
+ _, err := plugin.loNetwork.addToNetwork(podNetwork)
+ if err != nil {
+ logrus.Errorf("Error while adding to cni lo network: %s", err)
+ return err
+ }
+
+ _, err = plugin.getDefaultNetwork().addToNetwork(podNetwork)
+ if err != nil {
+ logrus.Errorf("Error while adding to cni network: %s", err)
+ return err
+ }
+
+ return err
+}
+
+func (plugin *cniNetworkPlugin) TearDownPod(podNetwork PodNetwork) error {
+ if err := plugin.checkInitialized(); err != nil {
+ return err
+ }
+
+ plugin.podLock(podNetwork).Lock()
+ defer plugin.podUnlock(podNetwork)
+
+ return plugin.getDefaultNetwork().deleteFromNetwork(podNetwork)
+}
+
+// TODO: Use the addToNetwork function to obtain the IP of the Pod. That will assume idempotent ADD call to the plugin.
+// Also fix the runtime's call to Status function to be done only in the case that the IP is lost, no need to do periodic calls
+func (plugin *cniNetworkPlugin) GetPodNetworkStatus(podNetwork PodNetwork) (string, error) {
+ plugin.podLock(podNetwork).Lock()
+ defer plugin.podUnlock(podNetwork)
+
+ ip, err := getContainerIP(plugin.nsenterPath, podNetwork.NetNS, DefaultInterfaceName, "-4")
+ if err != nil {
+ return "", err
+ }
+
+ return ip.String(), nil
+}
+
+func (network *cniNetwork) addToNetwork(podNetwork PodNetwork) (cnitypes.Result, error) {
+ rt, err := buildCNIRuntimeConf(podNetwork)
+ if err != nil {
+ logrus.Errorf("Error adding network: %v", err)
+ return nil, err
+ }
+
+ netconf, cninet := network.NetworkConfig, network.CNIConfig
+ logrus.Infof("About to add CNI network %s (type=%v)", netconf.Name, netconf.Plugins[0].Network.Type)
+ res, err := cninet.AddNetworkList(netconf, rt)
+ if err != nil {
+ logrus.Errorf("Error adding network: %v", err)
+ return nil, err
+ }
+
+ return res, nil
+}
+
+func (network *cniNetwork) deleteFromNetwork(podNetwork PodNetwork) error {
+ rt, err := buildCNIRuntimeConf(podNetwork)
+ if err != nil {
+ logrus.Errorf("Error deleting network: %v", err)
+ return err
+ }
+
+ netconf, cninet := network.NetworkConfig, network.CNIConfig
+ logrus.Infof("About to del CNI network %s (type=%v)", netconf.Name, netconf.Plugins[0].Network.Type)
+ err = cninet.DelNetworkList(netconf, rt)
+ if err != nil {
+ logrus.Errorf("Error deleting network: %v", err)
+ return err
+ }
+ return nil
+}
+
+func buildCNIRuntimeConf(podNetwork PodNetwork) (*libcni.RuntimeConf, error) {
+ logrus.Infof("Got pod network %+v", podNetwork)
+
+ rt := &libcni.RuntimeConf{
+ ContainerID: podNetwork.ID,
+ NetNS: podNetwork.NetNS,
+ IfName: DefaultInterfaceName,
+ Args: [][2]string{
+ {"IgnoreUnknown", "1"},
+ {"K8S_POD_NAMESPACE", podNetwork.Namespace},
+ {"K8S_POD_NAME", podNetwork.Name},
+ {"K8S_POD_INFRA_CONTAINER_ID", podNetwork.ID},
+ },
+ }
+
+ if len(podNetwork.PortMappings) == 0 {
+ return rt, nil
+ }
+
+ rt.CapabilityArgs = map[string]interface{}{
+ "portMappings": podNetwork.PortMappings,
+ }
+ return rt, nil
+}
+
+func (plugin *cniNetworkPlugin) Status() error {
+ return plugin.checkInitialized()
+}
diff --git a/vendor/github.com/cri-o/ocicni/pkg/ocicni/types.go b/vendor/github.com/cri-o/ocicni/pkg/ocicni/types.go
new file mode 100644
index 000000000..a272e92e7
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/pkg/ocicni/types.go
@@ -0,0 +1,62 @@
+package ocicni
+
+const (
+ // DefaultInterfaceName is the string to be used for the interface name inside the net namespace
+ DefaultInterfaceName = "eth0"
+ // CNIPluginName is the default name of the plugin
+ CNIPluginName = "cni"
+ // DefaultNetDir is the place to look for CNI Network
+ DefaultNetDir = "/etc/cni/net.d"
+ // DefaultCNIDir is the place to look for cni config files
+ DefaultCNIDir = "/opt/cni/bin"
+ // VendorCNIDirTemplate is the template for looking up vendor specific cni config/executable files
+ VendorCNIDirTemplate = "%s/opt/%s/bin"
+)
+
+// PortMapping maps to the standard CNI portmapping Capability
+// see: https://github.com/containernetworking/cni/blob/master/CONVENTIONS.md
+type PortMapping struct {
+ // HostPort is the port number on the host.
+ HostPort int32 `json:"hostPort"`
+ // ContainerPort is the port number inside the sandbox.
+ ContainerPort int32 `json:"containerPort"`
+ // Protocol is the protocol of the port mapping.
+ Protocol string `json:"protocol"`
+ // HostIP is the host ip to use.
+ HostIP string `json:"hostIP"`
+}
+
+// PodNetwork configures the network of a pod sandbox.
+type PodNetwork struct {
+ // Name is the name of the sandbox.
+ Name string
+ // Namespace is the namespace of the sandbox.
+ Namespace string
+ // ID is the id of the sandbox container.
+ ID string
+ // NetNS is the network namespace path of the sandbox.
+ NetNS string
+ // PortMappings is the port mapping of the sandbox.
+ PortMappings []PortMapping
+}
+
+// CNIPlugin is the interface that needs to be implemented by a plugin
+type CNIPlugin interface {
+ // Name returns the plugin's name. This will be used when searching
+ // for a plugin by name, e.g.
+ Name() string
+
+ // SetUpPod is the method called after the sandbox container of
+ // the pod has been created but before the other containers of the
+ // pod are launched.
+ SetUpPod(network PodNetwork) error
+
+ // TearDownPod is the method called before a pod's sandbox container will be deleted
+ TearDownPod(network PodNetwork) error
+
+ // Status is the method called to obtain the ipv4 or ipv6 addresses of the pod sandbox
+ GetPodNetworkStatus(network PodNetwork) (string, error)
+
+ // NetworkStatus returns error if the network plugin is in error state
+ Status() error
+}
diff --git a/vendor/github.com/cri-o/ocicni/pkg/ocicni/util.go b/vendor/github.com/cri-o/ocicni/pkg/ocicni/util.go
new file mode 100644
index 000000000..547e95972
--- /dev/null
+++ b/vendor/github.com/cri-o/ocicni/pkg/ocicni/util.go
@@ -0,0 +1,32 @@
+package ocicni
+
+import (
+ "fmt"
+ "net"
+ "os/exec"
+ "strings"
+)
+
+func getContainerIP(nsenterPath, netnsPath, interfaceName, addrType string) (net.IP, error) {
+ // Try to retrieve ip inside container network namespace
+ output, err := exec.Command(nsenterPath, fmt.Sprintf("--net=%s", netnsPath), "-F", "--",
+ "ip", "-o", addrType, "addr", "show", "dev", interfaceName, "scope", "global").CombinedOutput()
+ if err != nil {
+ return nil, fmt.Errorf("Unexpected command output %s with error: %v", output, err)
+ }
+
+ lines := strings.Split(string(output), "\n")
+ if len(lines) < 1 {
+ return nil, fmt.Errorf("Unexpected command output %s", output)
+ }
+ fields := strings.Fields(lines[0])
+ if len(fields) < 4 {
+ return nil, fmt.Errorf("Unexpected address output %s ", lines[0])
+ }
+ ip, _, err := net.ParseCIDR(fields[3])
+ if err != nil {
+ return nil, fmt.Errorf("CNI failed to parse ip from output %s due to %v", output, err)
+ }
+
+ return ip, nil
+}