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// Copyright 2018 Google 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.
package boot
import (
"fmt"
"gvisor.googlesource.com/gvisor/pkg/control/server"
"gvisor.googlesource.com/gvisor/pkg/sentry/arch"
"gvisor.googlesource.com/gvisor/pkg/sentry/control"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
"gvisor.googlesource.com/gvisor/pkg/sentry/socket/epsocket"
"gvisor.googlesource.com/gvisor/pkg/sentry/watchdog"
)
const (
// ContainerCheckpoint checkpoints a container.
ContainerCheckpoint = "containerManager.Checkpoint"
// ContainerEvent is the URPC endpoint for getting stats about the
// container used by "runsc events".
ContainerEvent = "containerManager.Event"
// ContainerExecute is the URPC endpoint for executing a command in a
// container..
ContainerExecute = "containerManager.Execute"
// ContainerPause pauses the container.
ContainerPause = "containerManager.Pause"
// ContainerProcesses is the URPC endpoint for getting the list of
// processes running in a container.
ContainerProcesses = "containerManager.Processes"
// ContainerSignal is used to send a signal to a container.
ContainerSignal = "containerManager.Signal"
// ContainerWait is used to wait on the init process of the container
// and return its ExitStatus.
ContainerWait = "containerManager.Wait"
// NetworkCreateLinksAndRoutes is the URPC endpoint for creating links
// and routes in a network stack.
NetworkCreateLinksAndRoutes = "Network.CreateLinksAndRoutes"
// RootContainerStart is the URPC endpoint for starting a new sandbox
// with root container.
RootContainerStart = "containerManager.StartRoot"
)
// ControlSocketAddr generates an abstract unix socket name for the given id.
func ControlSocketAddr(id string) string {
return fmt.Sprintf("\x00runsc-sandbox.%s", id)
}
// controller holds the control server, and is used for communication into the
// sandbox.
type controller struct {
// srv is the contorl server.
srv *server.Server
// manager holds the containerManager methods.
manager *containerManager
}
// newController creates a new controller and starts it listening.
func newController(fd int, k *kernel.Kernel, w *watchdog.Watchdog) (*controller, error) {
srv, err := server.CreateFromFD(fd)
if err != nil {
return nil, err
}
manager := &containerManager{
startChan: make(chan struct{}),
startResultChan: make(chan error),
k: k,
watchdog: w,
}
srv.Register(manager)
if eps, ok := k.NetworkStack().(*epsocket.Stack); ok {
net := &Network{
Stack: eps.Stack,
}
srv.Register(net)
}
if err := srv.StartServing(); err != nil {
return nil, err
}
return &controller{
srv: srv,
manager: manager,
}, nil
}
// containerManager manages sandboes containers.
type containerManager struct {
// startChan is used to signal when the root container process should
// be started.
startChan chan struct{}
// startResultChan is used to signal when the root container has
// started. Any errors encountered during startup will be sent to the
// channel. A nil value indicates success.
startResultChan chan error
// k is the emulated linux kernel on which the sandboxed
// containers run.
k *kernel.Kernel
// watchdog is the kernel watchdog.
watchdog *watchdog.Watchdog
}
// StartRoot will start the root container process.
func (cm *containerManager) StartRoot(_, _ *struct{}) error {
// Tell the root container to start and wait for the result.
cm.startChan <- struct{}{}
return <-cm.startResultChan
}
// Processes retrieves information about processes running in the sandbox.
func (cm *containerManager) Processes(_, out *[]*control.Process) error {
return control.Processes(cm.k, out)
}
// Execute runs a command on a created or running sandbox.
func (cm *containerManager) Execute(e *control.ExecArgs, waitStatus *uint32) error {
proc := control.Proc{Kernel: cm.k}
if err := proc.Exec(e, waitStatus); err != nil {
return fmt.Errorf("error executing: %+v: %v", e, err)
}
return nil
}
// Checkpoint pauses a sandbox and saves its state.
func (cm *containerManager) Checkpoint(o *control.SaveOpts, _ *struct{}) error {
state := control.State{
Kernel: cm.k,
Watchdog: cm.watchdog,
}
return state.Save(o, nil)
}
// Pause suspends the process in a container.
func (cm *containerManager) Pause(_, _ *struct{}) error {
cm.k.Pause()
return nil
}
// Wait waits for the init process in the given container.
func (cm *containerManager) Wait(cid *string, waitStatus *uint32) error {
// TODO: Use the cid and wait on the init process in that
// container. Currently we just wait on PID 1 in the sandbox.
tg := cm.k.TaskSet().Root.ThreadGroupWithID(1)
if tg == nil {
return fmt.Errorf("cannot wait: no thread group with id 1")
}
tg.WaitExited()
*waitStatus = tg.ExitStatus().Status()
return nil
}
// SignalArgs are arguments to the Signal method.
type SignalArgs struct {
// CID is the container id.
CID string
// Signo is the signal to send to the process.
Signo int32
}
// Signal sends a signal to the init process of the container.
func (cm *containerManager) Signal(args *SignalArgs, _ *struct{}) error {
// TODO: Use the cid and send the signal to the init
// process in theat container. Currently we just signal PID 1 in the
// sandbox.
si := arch.SignalInfo{Signo: args.Signo}
t := cm.k.TaskSet().Root.TaskWithID(1)
if t == nil {
return fmt.Errorf("cannot signal: no task with id 1")
}
return t.SendSignal(&si)
}
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