Fix podman network IDs handling

The libpod network logic knows about networks IDs but OCICNI
does not. We cannot pass the network ID to OCICNI. Instead we
need to make sure we only use network names internally. This
is also important for libpod since we also only store the
network names in the state. If we would add a ID there the
same networks could accidentally be added twice.

Fixes containers#9451

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

libpod/network/files.go

@@ -81,9 +81,9 @@ func GetCNIConfigPathByNameOrID(config *config.Config, name string) (string, err
 	return "", errors.Wrap(define.ErrNoSuchNetwork, fmt.Sprintf("unable to find network configuration for %s", name))
 }
 
-// ReadRawCNIConfByName reads the raw CNI configuration for a CNI
+// ReadRawCNIConfByNameOrID reads the raw CNI configuration for a CNI
 // network by name
-func ReadRawCNIConfByName(config *config.Config, name string) ([]byte, error) {
+func ReadRawCNIConfByNameOrID(config *config.Config, name string) ([]byte, error) {
 	confFile, err := GetCNIConfigPathByNameOrID(config, name)
 	if err != nil {
 		return nil, err

libpod/network/network.go

@@ -7,6 +7,7 @@ import (
 	"net"
 	"os"
 
+	"github.com/containernetworking/cni/libcni"
 	"github.com/containernetworking/cni/pkg/types"
 	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
 	"github.com/containers/common/pkg/config"
@@ -222,7 +223,7 @@ func RemoveNetwork(config *config.Config, name string) error {
 
 // InspectNetwork reads a CNI config and returns its configuration
 func InspectNetwork(config *config.Config, name string) (map[string]interface{}, error) {
-	b, err := ReadRawCNIConfByName(config, name)
+	b, err := ReadRawCNIConfByNameOrID(config, name)
 	if err != nil {
 		return nil, err
 	}
@@ -234,7 +235,7 @@ func InspectNetwork(config *config.Config, name string) (map[string]interface{},
 // Exists says whether a given network exists or not; it meant
 // specifically for restful responses so 404s can be used
 func Exists(config *config.Config, name string) (bool, error) {
-	_, err := ReadRawCNIConfByName(config, name)
+	_, err := ReadRawCNIConfByNameOrID(config, name)
 	if err != nil {
 		if errors.Cause(err) == define.ErrNoSuchNetwork {
 			return false, nil
@@ -277,3 +278,17 @@ func PruneNetworks(rtc *config.Config, usedNetworks map[string]bool) ([]*entitie
 	}
 	return reports, nil
 }
+
+// NormalizeName translates a network ID into a name.
+// If the input is a name the name is returned.
+func NormalizeName(config *config.Config, nameOrID string) (string, error) {
+	path, err := GetCNIConfigPathByNameOrID(config, nameOrID)
+	if err != nil {
+		return "", err
+	}
+	conf, err := libcni.ConfListFromFile(path)
+	if err != nil {
+		return "", err
+	}
+	return conf.Name, nil
+}

libpod/networking_linux.go

@@ -1139,13 +1139,12 @@ func (c *Container) NetworkDisconnect(nameOrID, netName string, force bool) erro
 		return err
 	}
 
-	exists, err := network.Exists(c.runtime.config, netName)
+	// check if network exists and if the input is a ID we get the name
+	// ocicni only uses names so it is important that we only use the name
+	netName, err = network.NormalizeName(c.runtime.config, netName)
 	if err != nil {
 		return err
 	}
-	if !exists {
-		return errors.Wrap(define.ErrNoSuchNetwork, netName)
-	}
 
 	index, nameExists := networks[netName]
 	if !nameExists && len(networks) > 0 {
@@ -1196,13 +1195,12 @@ func (c *Container) NetworkConnect(nameOrID, netName string, aliases []string) e
 		return err
 	}
 
-	exists, err := network.Exists(c.runtime.config, netName)
+	// check if network exists and if the input is a ID we get the name
+	// ocicni only uses names so it is important that we only use the name
+	netName, err = network.NormalizeName(c.runtime.config, netName)
 	if err != nil {
 		return err
 	}
-	if !exists {
-		return errors.Wrap(define.ErrNoSuchNetwork, netName)
-	}
 
 	c.lock.Lock()
 	defer c.lock.Unlock()

libpod/runtime_ctr.go

@@ -12,6 +12,7 @@ import (
 	"github.com/containers/common/pkg/config"
 	"github.com/containers/podman/v2/libpod/define"
 	"github.com/containers/podman/v2/libpod/events"
+	"github.com/containers/podman/v2/libpod/network"
 	"github.com/containers/podman/v2/libpod/shutdown"
 	"github.com/containers/podman/v2/pkg/cgroups"
 	"github.com/containers/podman/v2/pkg/domain/entities/reports"
@@ -285,6 +286,21 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Contai
 		return nil, err
 	}
 
+	// normalize the networks to names
+	// ocicni only knows about cni names so we have to make
+	// sure we do not use ids internally
+	if len(ctr.config.Networks) > 0 {
+		netNames := make([]string, 0, len(ctr.config.Networks))
+		for _, nameOrID := range ctr.config.Networks {
+			netName, err := network.NormalizeName(r.config, nameOrID)
+			if err != nil {
+				return nil, err
+			}
+			netNames = append(netNames, netName)
+		}
+		ctr.config.Networks = netNames
+	}
+
 	// Inhibit shutdown until creation succeeds
 	shutdown.Inhibit()
 	defer shutdown.Uninhibit()

test/e2e/network_connect_disconnect_test.go

@@ -195,6 +195,54 @@ var _ = Describe("Podman network connect and disconnect", func() {
 		Expect(exec.ExitCode()).To(BeZero())
 	})
 
+	It("podman network connect and run with network ID", func() {
+		SkipIfRootless("network connect and disconnect are only rootful")
+		netName := "ID" + stringid.GenerateNonCryptoID()
+		session := podmanTest.Podman([]string{"network", "create", netName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(netName)
+
+		session = podmanTest.Podman([]string{"network", "ls", "--format", "{{.ID}}", "--filter", "name=" + netName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		netID := session.OutputToString()
+
+		ctr := podmanTest.Podman([]string{"run", "-dt", "--name", "test", "--network", netID, ALPINE, "top"})
+		ctr.WaitWithDefaultTimeout()
+		Expect(ctr.ExitCode()).To(BeZero())
+
+		exec := podmanTest.Podman([]string{"exec", "-it", "test", "ip", "addr", "show", "eth0"})
+		exec.WaitWithDefaultTimeout()
+		Expect(exec.ExitCode()).To(BeZero())
+
+		// Create a second network
+		newNetName := "ID2" + stringid.GenerateNonCryptoID()
+		session = podmanTest.Podman([]string{"network", "create", newNetName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(newNetName)
+
+		session = podmanTest.Podman([]string{"network", "ls", "--format", "{{.ID}}", "--filter", "name=" + netName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		newNetID := session.OutputToString()
+
+		connect := podmanTest.Podman([]string{"network", "connect", newNetID, "test"})
+		connect.WaitWithDefaultTimeout()
+		Expect(connect.ExitCode()).To(BeZero())
+
+		inspect := podmanTest.Podman([]string{"container", "inspect", "test", "--format", "{{.NetworkSettings.Networks}}"})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect.ExitCode()).To(BeZero())
+		Expect(inspect.OutputToString()).To(ContainSubstring(netName))
+		Expect(inspect.OutputToString()).To(ContainSubstring(newNetName))
+
+		exec = podmanTest.Podman([]string{"exec", "-it", "test", "ip", "addr", "show", "eth1"})
+		exec.WaitWithDefaultTimeout()
+		Expect(exec.ExitCode()).To(BeZero())
+	})
+
 	It("podman network disconnect when not running", func() {
 		SkipIfRootless("network connect and disconnect are only rootful")
 		netName1 := "aliasTest" + stringid.GenerateNonCryptoID()
@@ -234,4 +282,39 @@ var _ = Describe("Podman network connect and disconnect", func() {
 		exec.WaitWithDefaultTimeout()
 		Expect(exec.ExitCode()).ToNot(BeZero())
 	})
+
+	It("podman network disconnect and run with network ID", func() {
+		SkipIfRootless("network connect and disconnect are only rootful")
+		netName := "aliasTest" + stringid.GenerateNonCryptoID()
+		session := podmanTest.Podman([]string{"network", "create", netName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		defer podmanTest.removeCNINetwork(netName)
+
+		session = podmanTest.Podman([]string{"network", "ls", "--format", "{{.ID}}", "--filter", "name=" + netName})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(BeZero())
+		netID := session.OutputToString()
+
+		ctr := podmanTest.Podman([]string{"run", "-dt", "--name", "test", "--network", netID, ALPINE, "top"})
+		ctr.WaitWithDefaultTimeout()
+		Expect(ctr.ExitCode()).To(BeZero())
+
+		exec := podmanTest.Podman([]string{"exec", "-it", "test", "ip", "addr", "show", "eth0"})
+		exec.WaitWithDefaultTimeout()
+		Expect(exec.ExitCode()).To(BeZero())
+
+		dis := podmanTest.Podman([]string{"network", "disconnect", netID, "test"})
+		dis.WaitWithDefaultTimeout()
+		Expect(dis.ExitCode()).To(BeZero())
+
+		inspect := podmanTest.Podman([]string{"container", "inspect", "test", "--format", "{{len .NetworkSettings.Networks}}"})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect.ExitCode()).To(BeZero())
+		Expect(inspect.OutputToString()).To(Equal("0"))
+
+		exec = podmanTest.Podman([]string{"exec", "-it", "test", "ip", "addr", "show", "eth0"})
+		exec.WaitWithDefaultTimeout()
+		Expect(exec.ExitCode()).ToNot(BeZero())
+	})
 })