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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/control"
"gvisor.googlesource.com/gvisor/pkg/sentry/kernel"
"gvisor.googlesource.com/gvisor/pkg/sentry/socket/epsocket"
)
const (
// ApplicationStart is the URPC endpoint for starting a sandboxed app.
ApplicationStart = "application.Start"
// ApplicationProcesses is the URPC endpoint for getting the list of
// processes running in a sandbox.
ApplicationProcesses = "application.Processes"
// ApplicationExecute is the URPC endpoint for executing a command in a
// sandbox.
ApplicationExecute = "application.Execute"
// ApplicationEvent is the URPC endpoint for getting stats about the
// container used by "runsc events".
ApplicationEvent = "application.Event"
// NetworkCreateLinksAndRoutes is the URPC endpoint for creating links
// and routes in a network stack.
NetworkCreateLinksAndRoutes = "Network.CreateLinksAndRoutes"
)
// 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
// app holds the application methods.
app *application
}
// newController creates a new controller and starts it listening.
func newController(fd int, k *kernel.Kernel) (*controller, error) {
srv, err := server.CreateFromFD(fd)
if err != nil {
return nil, err
}
app := &application{
startChan: make(chan struct{}),
startResultChan: make(chan error, 1),
k: k,
}
srv.Register(app)
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,
app: app,
}, nil
}
// application contains methods that control the sandboxed application.
type application struct {
// startChan is used to signal when the application process should be
// started.
startChan chan struct{}
// startResultChan is used to signal when the application 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
// application runs.
k *kernel.Kernel
}
// Start will start the application process.
func (a *application) Start(_, _ *struct{}) error {
// Tell the application to start and wait for the result.
a.startChan <- struct{}{}
return <-a.startResultChan
}
// Processes retrieves information about processes running in the sandbox.
func (a *application) Processes(_, out *[]*control.Process) error {
return control.Processes(a.k, out)
}
// Execute runs a command on a created or running sandbox.
func (a *application) Execute(e *control.ExecArgs, waitStatus *uint32) error {
proc := control.Proc{Kernel: a.k}
if err := proc.Exec(e, waitStatus); err != nil {
return fmt.Errorf("error executing: %+v: %v", e, err)
}
return nil
}
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