Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

4 files changed, 539 insertions, 0 deletions

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
+}