move network alias validation to container create

Podman 4.0 currently errors when you use network aliases for a network which
has dns disabled. Because the error happens on network setup this can
cause regression for old working containers. The network backend should not
validate this. Instead podman should check this at container create time
and also for network connect.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

4 files changed, 43 insertions, 31 deletions

diff --git a/libpod/network/cni/run.go b/libpod/network/cni/run.go
index 0f91a407c..bd873f89b 100644
--- a/libpod/network/cni/run.go
+++ b/libpod/network/cni/run.go
@@ -186,9 +186,6 @@ outer:
 		}
 		return errors.Errorf("requested static ip %s not in any subnet on network %s", ip.String(), network.libpodNet.Name)
 	}
-	if len(netOpts.Aliases) > 0 && !network.libpodNet.DNSEnabled {
-		return errors.New("cannot set aliases on a network without dns enabled")
-	}
 	return nil
 }
 
diff --git a/libpod/network/cni/run_test.go b/libpod/network/cni/run_test.go
index 0a2c090e1..965203c2a 100644
--- a/libpod/network/cni/run_test.go
+++ b/libpod/network/cni/run_test.go
@@ -966,6 +966,26 @@ var _ = Describe("run CNI", func() {
 			})
 		})
 
+		It("setup with aliases but dns disabled should work", func() {
+			runTest(func() {
+				defNet := types.DefaultNetworkName
+				intName := "eth0"
+				setupOpts := types.SetupOptions{
+					NetworkOptions: types.NetworkOptions{
+						ContainerID: stringid.GenerateNonCryptoID(),
+						Networks: map[string]types.PerNetworkOptions{
+							defNet: {
+								InterfaceName: intName,
+								Aliases:       []string{"somealias"},
+							},
+						},
+					},
+				}
+				_, err := libpodNet.Setup(netNSContainer.Path(), setupOpts)
+				Expect(err).ToNot(HaveOccurred())
+			})
+		})
+
 	})
 
 	Context("invalid network setup test", func() {
@@ -1052,27 +1072,6 @@ var _ = Describe("run CNI", func() {
 			})
 		})
 
-		It("setup with aliases but dns disabled", func() {
-			runTest(func() {
-				defNet := types.DefaultNetworkName
-				intName := "eth0"
-				setupOpts := types.SetupOptions{
-					NetworkOptions: types.NetworkOptions{
-						ContainerID: stringid.GenerateNonCryptoID(),
-						Networks: map[string]types.PerNetworkOptions{
-							defNet: {
-								InterfaceName: intName,
-								Aliases:       []string{"somealias"},
-							},
-						},
-					},
-				}
-				_, err := libpodNet.Setup(netNSContainer.Path(), setupOpts)
-				Expect(err).To(HaveOccurred())
-				Expect(err.Error()).To(ContainSubstring("cannot set aliases on a network without dns enabled"))
-			})
-		})
-
 		It("setup without networks", func() {
 			runTest(func() {
 				setupOpts := types.SetupOptions{
diff --git a/libpod/networking_linux.go b/libpod/networking_linux.go
index e4fcfc271..e792a410c 100644
--- a/libpod/networking_linux.go
+++ b/libpod/networking_linux.go
@@ -1262,6 +1262,14 @@ func (c *Container) NetworkConnect(nameOrID, netName string, aliases []string) e
 	// get network status before we connect
 	networkStatus := c.getNetworkStatus()
 
+	network, err := c.runtime.network.NetworkInspect(netName)
+	if err != nil {
+		return err
+	}
+	if !network.DNSEnabled && len(aliases) > 0 {
+		return errors.Wrapf(define.ErrInvalidArg, "cannot set network aliases for network %q because dns is disabled", netName)
+	}
+
 	if err := c.runtime.state.NetworkConnect(c, netName, aliases); err != nil {
 		return err
 	}
diff --git a/libpod/runtime_ctr.go b/libpod/runtime_ctr.go
index 9a4dbf626..93bfdd54b 100644
--- a/libpod/runtime_ctr.go
+++ b/libpod/runtime_ctr.go
@@ -234,13 +234,6 @@ func (r *Runtime) newContainer(ctx context.Context, rSpec *spec.Spec, options ..
 }
 
 func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Container, retErr error) {
-	// Validate the container
-	if err := ctr.validate(); err != nil {
-		return nil, err
-	}
-	if ctr.config.IsInfra {
-		ctr.config.StopTimeout = 10
-	}
 	// normalize the networks to names
 	// ocicni only knows about cni names so we have to make
 	// sure we do not use ids internally
@@ -265,11 +258,26 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Contai
 			if err != nil {
 				return nil, err
 			}
+			network, err := r.network.NetworkInspect(netName)
+			if err != nil {
+				return nil, err
+			}
+			if !network.DNSEnabled {
+				return nil, errors.Wrapf(define.ErrInvalidArg, "cannot set network aliases for network %q because dns is disabled", netName)
+			}
 			netAliases[netName] = aliases
 		}
 		ctr.config.NetworkAliases = netAliases
 	}
 
+	// Validate the container
+	if err := ctr.validate(); err != nil {
+		return nil, err
+	}
+	if ctr.config.IsInfra {
+		ctr.config.StopTimeout = 10
+	}
+
 	// Inhibit shutdown until creation succeeds
 	shutdown.Inhibit()
 	defer shutdown.Uninhibit()