// +build linux freebsd
 
 package daemon
 
 import (

 	"context"

 	"fmt"

 	"io/ioutil"

 	"os"
 	"path/filepath"
 	"strconv"
 	"time"
 
 	"github.com/docker/docker/container"
 	"github.com/docker/docker/daemon/links"

 	"github.com/docker/docker/errdefs"

 	"github.com/docker/docker/pkg/idtools"

 	"github.com/docker/docker/pkg/mount"

 	"github.com/docker/docker/pkg/stringid"
 	"github.com/docker/docker/runconfig"

 	"github.com/docker/libnetwork"

 	"github.com/opencontainers/selinux/go-selinux/label"

 	"github.com/pkg/errors"

 	"github.com/sirupsen/logrus"

 	"golang.org/x/sys/unix"

 )
 
 func (daemon *Daemon) setupLinkedContainers(container *container.Container) ([]string, error) {
 	var env []string

 	children := daemon.children(container)

 	bridgeSettings := container.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]

 	if bridgeSettings == nil || bridgeSettings.EndpointSettings == nil {

 		return nil, nil
 	}
 

 	for linkAlias, child := range children {
 		if !child.IsRunning() {

 			return nil, fmt.Errorf("Cannot link to a non running container: %s AS %s", child.Name, linkAlias)

 		}

 		childBridgeSettings := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]

 		if childBridgeSettings == nil || childBridgeSettings.EndpointSettings == nil {

 			return nil, fmt.Errorf("container %s not attached to default bridge network", child.ID)
 		}

 		link := links.NewLink(
 			bridgeSettings.IPAddress,
 			childBridgeSettings.IPAddress,
 			linkAlias,
 			child.Config.Env,
 			child.Config.ExposedPorts,
 		)

 		env = append(env, link.ToEnv()...)

 	}

 	return env, nil
 }
 

 func (daemon *Daemon) getIpcContainer(id string) (*container.Container, error) {
 	errMsg := "can't join IPC of container " + id
 	// Check the container exists
 	container, err := daemon.GetContainer(id)

 	if err != nil {

 		return nil, errors.Wrap(err, errMsg)

 	}

 	// Check the container is running and not restarting
 	if err := daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting); err != nil {
 		return nil, errors.Wrap(err, errMsg)
 	}
 	// Check the container ipc is shareable
 	if st, err := os.Stat(container.ShmPath); err != nil || !st.IsDir() {
 		if err == nil || os.IsNotExist(err) {
 			return nil, errors.New(errMsg + ": non-shareable IPC")
 		}
 		// stat() failed?
 		return nil, errors.Wrap(err, errMsg+": unexpected error from stat "+container.ShmPath)
 	}
 
 	return container, nil

 }
 

 func (daemon *Daemon) getPidContainer(container *container.Container) (*container.Container, error) {
 	containerID := container.HostConfig.PidMode.Container()

 	container, err := daemon.GetContainer(containerID)

 	if err != nil {

 		return nil, errors.Wrapf(err, "cannot join PID of a non running container: %s", containerID)

 	}

 	return container, daemon.checkContainer(container, containerIsRunning, containerIsNotRestarting)
 }
 
 func containerIsRunning(c *container.Container) error {

 	if !c.IsRunning() {

 		return errdefs.Conflict(errors.Errorf("container %s is not running", c.ID))

 	}

 	return nil
 }
 
 func containerIsNotRestarting(c *container.Container) error {

 	if c.IsRestarting() {

 		return errContainerIsRestarting(c.ID)

 	}

 	return nil

 }
 

 func (daemon *Daemon) setupIpcDirs(c *container.Container) error {

 	ipcMode := c.HostConfig.IpcMode

 	switch {
 	case ipcMode.IsContainer():
 		ic, err := daemon.getIpcContainer(ipcMode.Container())

 		if err != nil {
 			return err
 		}

 		c.ShmPath = ic.ShmPath

 
 	case ipcMode.IsHost():

 		if _, err := os.Stat("/dev/shm"); err != nil {
 			return fmt.Errorf("/dev/shm is not mounted, but must be for --ipc=host")

 		}

 		c.ShmPath = "/dev/shm"

 
 	case ipcMode.IsPrivate(), ipcMode.IsNone():
 		// c.ShmPath will/should not be used, so make it empty.
 		// Container's /dev/shm mount comes from OCI spec.
 		c.ShmPath = ""
 
 	case ipcMode.IsEmpty():
 		// A container was created by an older version of the daemon.
 		// The default behavior used to be what is now called "shareable".
 		fallthrough
 
 	case ipcMode.IsShareable():

 		rootIDs := daemon.idMappings.RootPair()

 		if !c.HasMountFor("/dev/shm") {
 			shmPath, err := c.ShmResourcePath()
 			if err != nil {
 				return err
 			}

 			if err := idtools.MkdirAllAndChown(shmPath, 0700, rootIDs); err != nil {

 				return err
 			}
 

 			shmproperty := "mode=1777,size=" + strconv.FormatInt(c.HostConfig.ShmSize, 10)

 			if err := unix.Mount("shm", shmPath, "tmpfs", uintptr(unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV), label.FormatMountLabel(shmproperty, c.GetMountLabel())); err != nil {

 				return fmt.Errorf("mounting shm tmpfs: %s", err)
 			}

 			if err := os.Chown(shmPath, rootIDs.UID, rootIDs.GID); err != nil {

 				return err
 			}

 			c.ShmPath = shmPath

 		}

 	default:
 		return fmt.Errorf("invalid IPC mode: %v", ipcMode)

 	}
 
 	return nil
 }

 func (daemon *Daemon) setupSecretDir(c *container.Container) (setupErr error) {

 	if len(c.SecretReferences) == 0 {

 		return nil
 	}
 

 	localMountPath, err := c.SecretMountPath()
 	if err != nil {
 		return errors.Wrap(err, "error getting secrets mount dir")
 	}

 	logrus.Debugf("secrets: setting up secret dir: %s", localMountPath)
 

 	// retrieve possible remapped range start for root UID, GID

 	rootIDs := daemon.idMappings.RootPair()

 	// create tmpfs

 	if err := idtools.MkdirAllAndChown(localMountPath, 0700, rootIDs); err != nil {

 		return errors.Wrap(err, "error creating secret local mount path")
 	}
 

 	defer func() {
 		if setupErr != nil {

 			// cleanup
 			_ = detachMounted(localMountPath)
 
 			if err := os.RemoveAll(localMountPath); err != nil {

 				logrus.Errorf("error cleaning up secret mount: %s", err)

 			}
 		}

 	}()

 	tmpfsOwnership := fmt.Sprintf("uid=%d,gid=%d", rootIDs.UID, rootIDs.GID)

 	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "nodev,nosuid,noexec,"+tmpfsOwnership); err != nil {

 		return errors.Wrap(err, "unable to setup secret mount")

 	}
 

 	if c.DependencyStore == nil {
 		return fmt.Errorf("secret store is not initialized")
 	}

 	for _, s := range c.SecretReferences {

 		// TODO (ehazlett): use type switch when more are supported
 		if s.File == nil {

 			logrus.Error("secret target type is not a file target")
 			continue

 		}
 

 		// secrets are created in the SecretMountPath on the host, at a
 		// single level

 		fPath, err := c.SecretFilePath(*s)
 		if err != nil {
 			return errors.Wrap(err, "error getting secret file path")
 		}

 		if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {

 			return errors.Wrap(err, "error creating secret mount path")

 		}
 

 		logrus.WithFields(logrus.Fields{

 			"name": s.File.Name,

 			"path": fPath,
 		}).Debug("injecting secret")

 		secret, err := c.DependencyStore.Secrets().Get(s.SecretID)
 		if err != nil {
 			return errors.Wrap(err, "unable to get secret from secret store")

 		}
 		if err := ioutil.WriteFile(fPath, secret.Spec.Data, s.File.Mode); err != nil {

 			return errors.Wrap(err, "error injecting secret")

 		}
 

 		uid, err := strconv.Atoi(s.File.UID)

 		if err != nil {
 			return err
 		}

 		gid, err := strconv.Atoi(s.File.GID)

 		if err != nil {
 			return err
 		}
 

 		if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {

 			return errors.Wrap(err, "error setting ownership for secret")

 		}
 	}
 

 	label.Relabel(localMountPath, c.MountLabel, false)
 

 	// remount secrets ro

 	if err := mount.Mount("tmpfs", localMountPath, "tmpfs", "remount,ro,"+tmpfsOwnership); err != nil {

 		return errors.Wrap(err, "unable to remount secret dir as readonly")

 	}
 

 	return nil

 }
 

 func (daemon *Daemon) setupConfigDir(c *container.Container) (setupErr error) {
 	if len(c.ConfigReferences) == 0 {
 		return nil
 	}
 

 	localPath, err := c.ConfigsDirPath()
 	if err != nil {
 		return err
 	}

 	logrus.Debugf("configs: setting up config dir: %s", localPath)
 
 	// retrieve possible remapped range start for root UID, GID

 	rootIDs := daemon.idMappings.RootPair()

 	// create tmpfs

 	if err := idtools.MkdirAllAndChown(localPath, 0700, rootIDs); err != nil {

 		return errors.Wrap(err, "error creating config dir")
 	}
 
 	defer func() {
 		if setupErr != nil {
 			if err := os.RemoveAll(localPath); err != nil {
 				logrus.Errorf("error cleaning up config dir: %s", err)
 			}
 		}
 	}()
 
 	if c.DependencyStore == nil {
 		return fmt.Errorf("config store is not initialized")
 	}
 
 	for _, configRef := range c.ConfigReferences {
 		// TODO (ehazlett): use type switch when more are supported
 		if configRef.File == nil {
 			logrus.Error("config target type is not a file target")
 			continue
 		}
 

 		fPath, err := c.ConfigFilePath(*configRef)
 		if err != nil {
 			return err
 		}

 
 		log := logrus.WithFields(logrus.Fields{"name": configRef.File.Name, "path": fPath})
 

 		if err := idtools.MkdirAllAndChown(filepath.Dir(fPath), 0700, rootIDs); err != nil {

 			return errors.Wrap(err, "error creating config path")
 		}
 
 		log.Debug("injecting config")

 		config, err := c.DependencyStore.Configs().Get(configRef.ConfigID)
 		if err != nil {
 			return errors.Wrap(err, "unable to get config from config store")

 		}
 		if err := ioutil.WriteFile(fPath, config.Spec.Data, configRef.File.Mode); err != nil {
 			return errors.Wrap(err, "error injecting config")
 		}
 
 		uid, err := strconv.Atoi(configRef.File.UID)
 		if err != nil {
 			return err
 		}
 		gid, err := strconv.Atoi(configRef.File.GID)
 		if err != nil {
 			return err
 		}
 

 		if err := os.Chown(fPath, rootIDs.UID+uid, rootIDs.GID+gid); err != nil {

 			return errors.Wrap(err, "error setting ownership for config")
 		}

 
 		label.Relabel(fPath, c.MountLabel, false)

 	}
 
 	return nil
 }
 

 func killProcessDirectly(cntr *container.Container) error {

 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
 
 	// Block until the container to stops or timeout.

 	status := <-cntr.Wait(ctx, container.WaitConditionNotRunning)

 	if status.Err() != nil {

 		// Ensure that we don't kill ourselves

 		if pid := cntr.GetPID(); pid != 0 {
 			logrus.Infof("Container %s failed to exit within 10 seconds of kill - trying direct SIGKILL", stringid.TruncateID(cntr.ID))

 			if err := unix.Kill(pid, 9); err != nil {
 				if err != unix.ESRCH {

 					return err
 				}

 				e := errNoSuchProcess{pid, 9}
 				logrus.Debug(e)
 				return e

 			}
 		}
 	}
 	return nil
 }
 
 func detachMounted(path string) error {

 	return unix.Unmount(path, unix.MNT_DETACH)

 }
 
 func isLinkable(child *container.Container) bool {
 	// A container is linkable only if it belongs to the default network

 	_, ok := child.NetworkSettings.Networks[runconfig.DefaultDaemonNetworkMode().NetworkName()]

 	return ok
 }

 func enableIPOnPredefinedNetwork() bool {
 	return false
 }

 
 func (daemon *Daemon) isNetworkHotPluggable() bool {
 	return true
 }

 
 func setupPathsAndSandboxOptions(container *container.Container, sboxOptions *[]libnetwork.SandboxOption) error {
 	var err error
 
 	container.HostsPath, err = container.GetRootResourcePath("hosts")
 	if err != nil {
 		return err
 	}
 	*sboxOptions = append(*sboxOptions, libnetwork.OptionHostsPath(container.HostsPath))
 
 	container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf")
 	if err != nil {
 		return err
 	}
 	*sboxOptions = append(*sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath))
 	return nil
 }
 

 func (daemon *Daemon) initializeNetworkingPaths(container *container.Container, nc *container.Container) error {

 	container.HostnamePath = nc.HostnamePath
 	container.HostsPath = nc.HostsPath
 	container.ResolvConfPath = nc.ResolvConfPath

 	return nil

 }

 
 func (daemon *Daemon) setupContainerMountsRoot(c *container.Container) error {
 	// get the root mount path so we can make it unbindable
 	p, err := c.MountsResourcePath("")
 	if err != nil {
 		return err
 	}
 
 	if err := idtools.MkdirAllAndChown(p, 0700, daemon.idMappings.RootPair()); err != nil {
 		return err
 	}
 
 	if err := mount.MakeUnbindable(p); err != nil {
 		// Setting unbindable is a precaution and is not neccessary for correct operation.
 		// Do not error out if this fails.
 		logrus.WithError(err).WithField("resource", p).WithField("container", c.ID).Warn("Error setting container resource mounts to unbindable, this may cause mount leakages, preventing removal of this container.")
 	}
 	return nil
 }