Add iptables integration to network code

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

Closes: #109
Approved by: mheon

6 files changed, 560 insertions, 13 deletions

diff --git a/libpod/networking.go b/libpod/networking.go
index 24e6339d7..082aae20d 100644
--- a/libpod/networking.go
+++ b/libpod/networking.go
@@ -1,10 +1,15 @@
 package libpod
 
 import (
+	"net"
+	"strings"
+
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/cri-o/ocicni/pkg/ocicni"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/kubelet/network/hostport"
 )
 
 // Get an OCICNI network config
@@ -18,6 +23,32 @@ func getPodNetwork(id, name, nsPath string, ports []ocicni.PortMapping) ocicni.P
 	}
 }
 
+// Convert port mapping struct from OCICNI version to one Kubernetes understands
+func portMappingToHostport(mappings []ocicni.PortMapping) ([]*hostport.PortMapping, error) {
+	newMappings := make([]*hostport.PortMapping, len(mappings))
+	for _, port := range mappings {
+		var protocol v1.Protocol
+		switch strings.ToLower(port.Protocol) {
+		case "udp":
+			protocol = v1.ProtocolUDP
+		case "tcp":
+			protocol = v1.ProtocolTCP
+		default:
+			return nil, errors.Wrapf(ErrInvalidArg, "protocol must be TCP or UDP, instead got %s", port.Protocol)
+		}
+
+		newPort := new(hostport.PortMapping)
+		newPort.Name = ""
+		newPort.HostPort = port.HostPort
+		newPort.ContainerPort = port.ContainerPort
+		newPort.Protocol = protocol
+		newPort.HostIP = port.HostIP
+
+		newMappings = append(newMappings, newPort)
+	}
+	return newMappings, nil
+}
+
 // Create and configure a new network namespace for a container
 func (r *Runtime) createNetNS(ctr *Container) (err error) {
 	ctrNS, err := ns.NewNS()
@@ -38,7 +69,32 @@ func (r *Runtime) createNetNS(ctr *Container) (err error) {
 		return errors.Wrapf(err, "error configuring network namespace for container %s", ctr.ID())
 	}
 
-	// TODO hostport mappings for forwarded ports
+	if len(ctr.config.PortMappings) != 0 {
+		ip, err := r.netPlugin.GetPodNetworkStatus(podNetwork)
+		if err != nil {
+			return errors.Wrapf(err, "failed to get status of network for container %s", ctr.ID())
+		}
+
+		ip4 := net.ParseIP(ip).To4()
+		if ip4 == nil {
+			return errors.Wrapf(err, "failed to parse IPv4 address for container %s", ctr.ID())
+		}
+
+		portMappings, err := portMappingToHostport(ctr.config.PortMappings)
+		if err != nil {
+			return errors.Wrapf(err, "failed to generate port ammpings for container %s", ctr.ID())
+		}
+
+		err = r.hostportManager.Add(ctr.ID(), &hostport.PodPortMapping{
+			Name:         ctr.Name(),
+			PortMappings: portMappings,
+			IP:           ip4,
+			HostNetwork:  false,
+		}, "lo")
+		if err != nil {
+			return errors.Wrapf(err, "failed to add port mappings for container %s", ctr.ID())
+		}
+	}
 
 	ctr.state.NetNS = ctrNS
 
@@ -62,7 +118,22 @@ func (r *Runtime) teardownNetNS(ctr *Container) error {
 		return nil
 	}
 
-	// TODO hostport mappings for forwarded ports should be undone
+	portMappings, err := portMappingToHostport(ctr.config.PortMappings)
+	if err != nil {
+		logrus.Errorf("Failed to generate port mappings for container %s: %v", ctr.ID(), err)
+	} else {
+		// Only attempt to remove hostport mappings if we successfully
+		// converted to hostport-style mappings
+		err := r.hostportManager.Remove(ctr.ID(), &hostport.PodPortMapping{
+			Name:         ctr.Name(),
+			PortMappings: portMappings,
+			HostNetwork:  false,
+		})
+		if err != nil {
+			logrus.Errorf("Failed to tear down port mappings for container %s: %v", ctr.ID(), err)
+		}
+	}
+
 	podNetwork := getPodNetwork(ctr.ID(), ctr.Name(), ctr.state.NetNS.Path(), ctr.config.PortMappings)
 
 	// The network may have already been torn down, so don't fail here, just log
diff --git a/libpod/runtime.go b/libpod/runtime.go
index 9712b6dd3..480da6677 100644
--- a/libpod/runtime.go
+++ b/libpod/runtime.go
@@ -12,6 +12,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
 	"github.com/ulule/deepcopier"
+	"k8s.io/kubernetes/pkg/kubelet/network/hostport"
 )
 
 // A RuntimeOption is a functional option which alters the Runtime created by
@@ -20,16 +21,17 @@ type RuntimeOption func(*Runtime) error
 
 // Runtime is the core libpod runtime
 type Runtime struct {
-	config         *RuntimeConfig
-	state          State
-	store          storage.Store
-	storageService *storageService
-	imageContext   *types.SystemContext
-	ociRuntime     *OCIRuntime
-	lockDir        string
-	netPlugin      ocicni.CNIPlugin
-	valid          bool
-	lock           sync.RWMutex
+	config          *RuntimeConfig
+	state           State
+	store           storage.Store
+	storageService  *storageService
+	imageContext    *types.SystemContext
+	ociRuntime      *OCIRuntime
+	lockDir         string
+	netPlugin       ocicni.CNIPlugin
+	hostportManager hostport.HostPortManager
+	valid           bool
+	lock            sync.RWMutex
 }
 
 // RuntimeConfig contains configuration options used to set up the runtime
@@ -170,7 +172,8 @@ func NewRuntime(options ...RuntimeOption) (runtime *Runtime, err error) {
 	}
 	runtime.netPlugin = netPlugin
 
-	// TODO: iptables/firewalld integration to ensure rules are in place for forwarding
+	// Set up the hostport manager
+	runtime.hostportManager = hostport.NewHostportManager()
 
 	// Set up the state
 	if runtime.config.InMemoryState {
diff --git a/vendor/k8s.io/utils/LICENSE b/vendor/k8s.io/utils/LICENSE
new file mode 100644
index 000000000..d64569567
--- /dev/null
+++ b/vendor/k8s.io/utils/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
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diff --git a/vendor/k8s.io/utils/README.md b/vendor/k8s.io/utils/README.md
new file mode 100644
index 000000000..2504649ef
--- /dev/null
+++ b/vendor/k8s.io/utils/README.md
@@ -0,0 +1,51 @@
+# Utils
+
+[![Build Status]](https://travis-ci.org/kubernetes/utils)
+
+A set of Go libraries that provide low-level,
+kubernetes-independent packages supplementing the [Go
+standard libs].
+
+## Purpose
+
+As Kubernetes grows and spins functionality out of its
+[core] and into cooperating repositories like
+[apiserver], [kubectl], [kubeadm], etc., the need
+arises for leaf repositories to house shared code and
+avoid cycles in repository relationships.
+
+This repository is intended to hold shared utilities
+with no Kubernetes dependence that may be of interest
+to any Go project.  See these [instructions for moving]
+an existing package to this repository.
+
+
+## Criteria for adding code here
+
+- Used by multiple Kubernetes repositories.
+
+- Full unit test coverage.
+
+- Go tools compliant (`go get`, `go test`, etc.).
+
+- Complex enough to be worth vendoring, rather than copying.
+
+- Stable, or backward compatible, API.
+
+- _No dependence on any Kubernetes repository_.
+
+## Libraries
+
+- [Exec](/exec) provides an interface for `os/exec`. It makes it easier
+  to mock and replace in tests, especially with
+  the [FakeExec](exec/testing/fake_exec.go) struct.
+
+[Build Status]: https://travis-ci.org/kubernetes/utils.svg?branch=master
+[Go standard libs]: https://golang.org/pkg/#stdlib
+[api]: https://github.com/kubernetes/api
+[apiserver]: https://github.com/kubernetes/apiserver
+[core]: https://github.com/kubernetes/kubernetes
+[ingress]: https://github.com/kubernetes/ingress
+[kubeadm]: https://github.com/kubernetes/kubeadm
+[kubectl]: https://github.com/kubernetes/kubectl
+[instructions for moving]: ./HOWTOMOVE.md
diff --git a/vendor/k8s.io/utils/exec/doc.go b/vendor/k8s.io/utils/exec/doc.go
new file mode 100644
index 000000000..cbb44bdb5
--- /dev/null
+++ b/vendor/k8s.io/utils/exec/doc.go
@@ -0,0 +1,18 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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.
+*/
+
+// Package exec provides an injectable interface and implementations for running commands.
+package exec // import "k8s.io/utils/exec"
diff --git a/vendor/k8s.io/utils/exec/exec.go b/vendor/k8s.io/utils/exec/exec.go
new file mode 100644
index 000000000..3b23eceb1
--- /dev/null
+++ b/vendor/k8s.io/utils/exec/exec.go
@@ -0,0 +1,202 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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.
+*/
+
+package exec
+
+import (
+	"io"
+	osexec "os/exec"
+	"syscall"
+	"time"
+)
+
+// ErrExecutableNotFound is returned if the executable is not found.
+var ErrExecutableNotFound = osexec.ErrNotFound
+
+// Interface is an interface that presents a subset of the os/exec API. Use this
+// when you want to inject fakeable/mockable exec behavior.
+type Interface interface {
+	// Command returns a Cmd instance which can be used to run a single command.
+	// This follows the pattern of package os/exec.
+	Command(cmd string, args ...string) Cmd
+
+	// LookPath wraps os/exec.LookPath
+	LookPath(file string) (string, error)
+}
+
+// Cmd is an interface that presents an API that is very similar to Cmd from os/exec.
+// As more functionality is needed, this can grow. Since Cmd is a struct, we will have
+// to replace fields with get/set method pairs.
+type Cmd interface {
+	// Run runs the command to the completion.
+	Run() error
+	// CombinedOutput runs the command and returns its combined standard output
+	// and standard error. This follows the pattern of package os/exec.
+	CombinedOutput() ([]byte, error)
+	// Output runs the command and returns standard output, but not standard err
+	Output() ([]byte, error)
+	SetDir(dir string)
+	SetStdin(in io.Reader)
+	SetStdout(out io.Writer)
+	SetStderr(out io.Writer)
+	// Stops the command by sending SIGTERM. It is not guaranteed the
+	// process will stop before this function returns. If the process is not
+	// responding, an internal timer function will send a SIGKILL to force
+	// terminate after 10 seconds.
+	Stop()
+}
+
+// ExitError is an interface that presents an API similar to os.ProcessState, which is
+// what ExitError from os/exec is. This is designed to make testing a bit easier and
+// probably loses some of the cross-platform properties of the underlying library.
+type ExitError interface {
+	String() string
+	Error() string
+	Exited() bool
+	ExitStatus() int
+}
+
+// Implements Interface in terms of really exec()ing.
+type executor struct{}
+
+// New returns a new Interface which will os/exec to run commands.
+func New() Interface {
+	return &executor{}
+}
+
+// Command is part of the Interface interface.
+func (executor *executor) Command(cmd string, args ...string) Cmd {
+	return (*cmdWrapper)(osexec.Command(cmd, args...))
+}
+
+// LookPath is part of the Interface interface
+func (executor *executor) LookPath(file string) (string, error) {
+	return osexec.LookPath(file)
+}
+
+// Wraps exec.Cmd so we can capture errors.
+type cmdWrapper osexec.Cmd
+
+var _ Cmd = &cmdWrapper{}
+
+func (cmd *cmdWrapper) SetDir(dir string) {
+	cmd.Dir = dir
+}
+
+func (cmd *cmdWrapper) SetStdin(in io.Reader) {
+	cmd.Stdin = in
+}
+
+func (cmd *cmdWrapper) SetStdout(out io.Writer) {
+	cmd.Stdout = out
+}
+
+func (cmd *cmdWrapper) SetStderr(out io.Writer) {
+	cmd.Stderr = out
+}
+
+// Run is part of the Cmd interface.
+func (cmd *cmdWrapper) Run() error {
+	return (*osexec.Cmd)(cmd).Run()
+}
+
+// CombinedOutput is part of the Cmd interface.
+func (cmd *cmdWrapper) CombinedOutput() ([]byte, error) {
+	out, err := (*osexec.Cmd)(cmd).CombinedOutput()
+	if err != nil {
+		return out, handleError(err)
+	}
+	return out, nil
+}
+
+func (cmd *cmdWrapper) Output() ([]byte, error) {
+	out, err := (*osexec.Cmd)(cmd).Output()
+	if err != nil {
+		return out, handleError(err)
+	}
+	return out, nil
+}
+
+// Stop is part of the Cmd interface.
+func (cmd *cmdWrapper) Stop() {
+	c := (*osexec.Cmd)(cmd)
+	if c.ProcessState.Exited() {
+		return
+	}
+	c.Process.Signal(syscall.SIGTERM)
+	time.AfterFunc(10*time.Second, func() {
+		if c.ProcessState.Exited() {
+			return
+		}
+		c.Process.Signal(syscall.SIGKILL)
+	})
+}
+
+func handleError(err error) error {
+	if ee, ok := err.(*osexec.ExitError); ok {
+		// Force a compile fail if exitErrorWrapper can't convert to ExitError.
+		var x ExitError = &ExitErrorWrapper{ee}
+		return x
+	}
+	if ee, ok := err.(*osexec.Error); ok {
+		if ee.Err == osexec.ErrNotFound {
+			return ErrExecutableNotFound
+		}
+	}
+	return err
+}
+
+// ExitErrorWrapper is an implementation of ExitError in terms of os/exec ExitError.
+// Note: standard exec.ExitError is type *os.ProcessState, which already implements Exited().
+type ExitErrorWrapper struct {
+	*osexec.ExitError
+}
+
+var _ ExitError = ExitErrorWrapper{}
+
+// ExitStatus is part of the ExitError interface.
+func (eew ExitErrorWrapper) ExitStatus() int {
+	ws, ok := eew.Sys().(syscall.WaitStatus)
+	if !ok {
+		panic("can't call ExitStatus() on a non-WaitStatus exitErrorWrapper")
+	}
+	return ws.ExitStatus()
+}
+
+// CodeExitError is an implementation of ExitError consisting of an error object
+// and an exit code (the upper bits of os.exec.ExitStatus).
+type CodeExitError struct {
+	Err  error
+	Code int
+}
+
+var _ ExitError = CodeExitError{}
+
+func (e CodeExitError) Error() string {
+	return e.Err.Error()
+}
+
+func (e CodeExitError) String() string {
+	return e.Err.Error()
+}
+
+func (e CodeExitError) Exited() bool {
+	return true
+}
+
+func (e CodeExitError) ExitStatus() int {
+	return e.Code
+}