package daemon import ( "errors" "fmt" "net" "os" "path" "strings" "github.com/Sirupsen/logrus" "github.com/docker/docker/container" "github.com/docker/docker/daemon/network" derr "github.com/docker/docker/errors" "github.com/docker/docker/pkg/stringid" "github.com/docker/docker/runconfig" containertypes "github.com/docker/engine-api/types/container" networktypes "github.com/docker/engine-api/types/network" "github.com/docker/go-connections/nat" "github.com/docker/libnetwork" "github.com/docker/libnetwork/netlabel" "github.com/docker/libnetwork/options" "github.com/docker/libnetwork/types" ) var ( // ErrRootFSReadOnly is returned when a container // rootfs is marked readonly. ErrRootFSReadOnly = errors.New("container rootfs is marked read-only") ) func (daemon *Daemon) buildSandboxOptions(container *container.Container, n libnetwork.Network) ([]libnetwork.SandboxOption, error) { var ( sboxOptions []libnetwork.SandboxOption err error dns []string dnsSearch []string dnsOptions []string bindings = make(nat.PortMap) pbList []types.PortBinding exposeList []types.TransportPort ) defaultNetName := runconfig.DefaultDaemonNetworkMode().NetworkName() sboxOptions = append(sboxOptions, libnetwork.OptionHostname(container.Config.Hostname), libnetwork.OptionDomainname(container.Config.Domainname)) if container.HostConfig.NetworkMode.IsHost() { sboxOptions = append(sboxOptions, libnetwork.OptionUseDefaultSandbox()) sboxOptions = append(sboxOptions, libnetwork.OptionOriginHostsPath("/etc/hosts")) sboxOptions = append(sboxOptions, libnetwork.OptionOriginResolvConfPath("/etc/resolv.conf")) } else { // OptionUseExternalKey is mandatory for userns support. // But optional for non-userns support sboxOptions = append(sboxOptions, libnetwork.OptionUseExternalKey()) } container.HostsPath, err = container.GetRootResourcePath("hosts") if err != nil { return nil, err } sboxOptions = append(sboxOptions, libnetwork.OptionHostsPath(container.HostsPath)) container.ResolvConfPath, err = container.GetRootResourcePath("resolv.conf") if err != nil { return nil, err } sboxOptions = append(sboxOptions, libnetwork.OptionResolvConfPath(container.ResolvConfPath)) if len(container.HostConfig.DNS) > 0 { dns = container.HostConfig.DNS } else if len(daemon.configStore.DNS) > 0 { dns = daemon.configStore.DNS } for _, d := range dns { sboxOptions = append(sboxOptions, libnetwork.OptionDNS(d)) } if len(container.HostConfig.DNSSearch) > 0 { dnsSearch = container.HostConfig.DNSSearch } else if len(daemon.configStore.DNSSearch) > 0 { dnsSearch = daemon.configStore.DNSSearch } for _, ds := range dnsSearch { sboxOptions = append(sboxOptions, libnetwork.OptionDNSSearch(ds)) } if len(container.HostConfig.DNSOptions) > 0 { dnsOptions = container.HostConfig.DNSOptions } else if len(daemon.configStore.DNSOptions) > 0 { dnsOptions = daemon.configStore.DNSOptions } for _, ds := range dnsOptions { sboxOptions = append(sboxOptions, libnetwork.OptionDNSOptions(ds)) } if container.NetworkSettings.SecondaryIPAddresses != nil { name := container.Config.Hostname if container.Config.Domainname != "" { name = name + "." + container.Config.Domainname } for _, a := range container.NetworkSettings.SecondaryIPAddresses { sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(name, a.Addr)) } } for _, extraHost := range container.HostConfig.ExtraHosts { // allow IPv6 addresses in extra hosts; only split on first ":" parts := strings.SplitN(extraHost, ":", 2) sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(parts[0], parts[1])) } if container.HostConfig.PortBindings != nil { for p, b := range container.HostConfig.PortBindings { bindings[p] = []nat.PortBinding{} for _, bb := range b { bindings[p] = append(bindings[p], nat.PortBinding{ HostIP: bb.HostIP, HostPort: bb.HostPort, }) } } } portSpecs := container.Config.ExposedPorts ports := make([]nat.Port, len(portSpecs)) var i int for p := range portSpecs { ports[i] = p i++ } nat.SortPortMap(ports, bindings) for _, port := range ports { expose := types.TransportPort{} expose.Proto = types.ParseProtocol(port.Proto()) expose.Port = uint16(port.Int()) exposeList = append(exposeList, expose) pb := types.PortBinding{Port: expose.Port, Proto: expose.Proto} binding := bindings[port] for i := 0; i < len(binding); i++ { pbCopy := pb.GetCopy() newP, err := nat.NewPort(nat.SplitProtoPort(binding[i].HostPort)) var portStart, portEnd int if err == nil { portStart, portEnd, err = newP.Range() } if err != nil { return nil, fmt.Errorf("Error parsing HostPort value(%s):%v", binding[i].HostPort, err) } pbCopy.HostPort = uint16(portStart) pbCopy.HostPortEnd = uint16(portEnd) pbCopy.HostIP = net.ParseIP(binding[i].HostIP) pbList = append(pbList, pbCopy) } if container.HostConfig.PublishAllPorts && len(binding) == 0 { pbList = append(pbList, pb) } } sboxOptions = append(sboxOptions, libnetwork.OptionPortMapping(pbList), libnetwork.OptionExposedPorts(exposeList)) // Legacy Link feature is supported only for the default bridge network. // return if this call to build join options is not for default bridge network if n.Name() != defaultNetName { return sboxOptions, nil } ep, _ := container.GetEndpointInNetwork(n) if ep == nil { return sboxOptions, nil } var childEndpoints, parentEndpoints []string children := daemon.children(container) for linkAlias, child := range children { if !isLinkable(child) { return nil, fmt.Errorf("Cannot link to %s, as it does not belong to the default network", child.Name) } _, alias := path.Split(linkAlias) // allow access to the linked container via the alias, real name, and container hostname aliasList := alias + " " + child.Config.Hostname // only add the name if alias isn't equal to the name if alias != child.Name[1:] { aliasList = aliasList + " " + child.Name[1:] } sboxOptions = append(sboxOptions, libnetwork.OptionExtraHost(aliasList, child.NetworkSettings.Networks[defaultNetName].IPAddress)) cEndpoint, _ := child.GetEndpointInNetwork(n) if cEndpoint != nil && cEndpoint.ID() != "" { childEndpoints = append(childEndpoints, cEndpoint.ID()) } } bridgeSettings := container.NetworkSettings.Networks[defaultNetName] for alias, parent := range daemon.parents(container) { if daemon.configStore.DisableBridge || !container.HostConfig.NetworkMode.IsPrivate() { continue } _, alias = path.Split(alias) logrus.Debugf("Update /etc/hosts of %s for alias %s with ip %s", parent.ID, alias, bridgeSettings.IPAddress) sboxOptions = append(sboxOptions, libnetwork.OptionParentUpdate( parent.ID, alias, bridgeSettings.IPAddress, )) if ep.ID() != "" { parentEndpoints = append(parentEndpoints, ep.ID()) } } linkOptions := options.Generic{ netlabel.GenericData: options.Generic{ "ParentEndpoints": parentEndpoints, "ChildEndpoints": childEndpoints, }, } sboxOptions = append(sboxOptions, libnetwork.OptionGeneric(linkOptions)) return sboxOptions, nil } func (daemon *Daemon) updateNetworkSettings(container *container.Container, n libnetwork.Network) error { if container.NetworkSettings == nil { container.NetworkSettings = &network.Settings{Networks: make(map[string]*networktypes.EndpointSettings)} } if !container.HostConfig.NetworkMode.IsHost() && containertypes.NetworkMode(n.Type()).IsHost() { return runconfig.ErrConflictHostNetwork } for s := range container.NetworkSettings.Networks { sn, err := daemon.FindNetwork(s) if err != nil { continue } if sn.Name() == n.Name() { // Avoid duplicate config return nil } if !containertypes.NetworkMode(sn.Type()).IsPrivate() || !containertypes.NetworkMode(n.Type()).IsPrivate() { return runconfig.ErrConflictSharedNetwork } if containertypes.NetworkMode(sn.Name()).IsNone() || containertypes.NetworkMode(n.Name()).IsNone() { return runconfig.ErrConflictNoNetwork } } if _, ok := container.NetworkSettings.Networks[n.Name()]; !ok { container.NetworkSettings.Networks[n.Name()] = new(networktypes.EndpointSettings) } return nil } func (daemon *Daemon) updateEndpointNetworkSettings(container *container.Container, n libnetwork.Network, ep libnetwork.Endpoint) error { if err := container.BuildEndpointInfo(n, ep); err != nil { return err } if container.HostConfig.NetworkMode == runconfig.DefaultDaemonNetworkMode() { container.NetworkSettings.Bridge = daemon.configStore.bridgeConfig.Iface } return nil } // UpdateNetwork is used to update the container's network (e.g. when linked containers // get removed/unlinked). func (daemon *Daemon) updateNetwork(container *container.Container) error { ctrl := daemon.netController sid := container.NetworkSettings.SandboxID sb, err := ctrl.SandboxByID(sid) if err != nil { return fmt.Errorf("error locating sandbox id %s: %v", sid, err) } // Find if container is connected to the default bridge network var n libnetwork.Network for name := range container.NetworkSettings.Networks { sn, err := daemon.FindNetwork(name) if err != nil { continue } if sn.Name() == runconfig.DefaultDaemonNetworkMode().NetworkName() { n = sn break } } if n == nil { // Not connected to the default bridge network; Nothing to do return nil } options, err := daemon.buildSandboxOptions(container, n) if err != nil { return fmt.Errorf("Update network failed: %v", err) } if err := sb.Refresh(options...); err != nil { return fmt.Errorf("Update network failed: Failure in refresh sandbox %s: %v", sid, err) } return nil } // updateContainerNetworkSettings update the network settings func (daemon *Daemon) updateContainerNetworkSettings(container *container.Container, endpointsConfig map[string]*networktypes.EndpointSettings) error { var ( n libnetwork.Network err error ) mode := container.HostConfig.NetworkMode if container.Config.NetworkDisabled || mode.IsContainer() { return nil } networkName := mode.NetworkName() if mode.IsDefault() { networkName = daemon.netController.Config().Daemon.DefaultNetwork } if mode.IsUserDefined() { n, err = daemon.FindNetwork(networkName) if err != nil { return err } networkName = n.Name() } if container.NetworkSettings == nil { container.NetworkSettings = &network.Settings{} } if len(endpointsConfig) > 0 { container.NetworkSettings.Networks = endpointsConfig } if container.NetworkSettings.Networks == nil { container.NetworkSettings.Networks = make(map[string]*networktypes.EndpointSettings) container.NetworkSettings.Networks[networkName] = new(networktypes.EndpointSettings) } if !mode.IsUserDefined() { return nil } // Make sure to internally store the per network endpoint config by network name if _, ok := container.NetworkSettings.Networks[networkName]; ok { return nil } if nwConfig, ok := container.NetworkSettings.Networks[n.ID()]; ok { container.NetworkSettings.Networks[networkName] = nwConfig delete(container.NetworkSettings.Networks, n.ID()) return nil } return nil } func (daemon *Daemon) allocateNetwork(container *container.Container) error { controller := daemon.netController if daemon.netController == nil { return nil } // Cleanup any stale sandbox left over due to ungraceful daemon shutdown if err := controller.SandboxDestroy(container.ID); err != nil { logrus.Errorf("failed to cleanup up stale network sandbox for container %s", container.ID) } updateSettings := false if len(container.NetworkSettings.Networks) == 0 { if container.Config.NetworkDisabled || container.HostConfig.NetworkMode.IsContainer() { return nil } err := daemon.updateContainerNetworkSettings(container, nil) if err != nil { return err } updateSettings = true } for n, nConf := range container.NetworkSettings.Networks { if err := daemon.connectToNetwork(container, n, nConf, updateSettings); err != nil { return err } } return container.WriteHostConfig() } func (daemon *Daemon) getNetworkSandbox(container *container.Container) libnetwork.Sandbox { var sb libnetwork.Sandbox daemon.netController.WalkSandboxes(func(s libnetwork.Sandbox) bool { if s.ContainerID() == container.ID { sb = s return true } return false }) return sb } // hasUserDefinedIPAddress returns whether the passed endpoint configuration contains IP address configuration func hasUserDefinedIPAddress(epConfig *networktypes.EndpointSettings) bool { return epConfig != nil && epConfig.IPAMConfig != nil && (len(epConfig.IPAMConfig.IPv4Address) > 0 || len(epConfig.IPAMConfig.IPv6Address) > 0) } // User specified ip address is acceptable only for networks with user specified subnets. func validateNetworkingConfig(n libnetwork.Network, epConfig *networktypes.EndpointSettings) error { if n == nil || epConfig == nil { return nil } if !hasUserDefinedIPAddress(epConfig) { return nil } _, _, nwIPv4Configs, nwIPv6Configs := n.Info().IpamConfig() for _, s := range []struct { ipConfigured bool subnetConfigs []*libnetwork.IpamConf }{ { ipConfigured: len(epConfig.IPAMConfig.IPv4Address) > 0, subnetConfigs: nwIPv4Configs, }, { ipConfigured: len(epConfig.IPAMConfig.IPv6Address) > 0, subnetConfigs: nwIPv6Configs, }, } { if s.ipConfigured { foundSubnet := false for _, cfg := range s.subnetConfigs { if len(cfg.PreferredPool) > 0 { foundSubnet = true break } } if !foundSubnet { return runconfig.ErrUnsupportedNetworkNoSubnetAndIP } } } return nil } // cleanOperationalData resets the operational data from the passed endpoint settings func cleanOperationalData(es *networktypes.EndpointSettings) { es.EndpointID = "" es.Gateway = "" es.IPAddress = "" es.IPPrefixLen = 0 es.IPv6Gateway = "" es.GlobalIPv6Address = "" es.GlobalIPv6PrefixLen = 0 es.MacAddress = "" } func (daemon *Daemon) updateNetworkConfig(container *container.Container, idOrName string, endpointConfig *networktypes.EndpointSettings, updateSettings bool) (libnetwork.Network, error) { if container.HostConfig.NetworkMode.IsContainer() { return nil, runconfig.ErrConflictSharedNetwork } if containertypes.NetworkMode(idOrName).IsBridge() && daemon.configStore.DisableBridge { container.Config.NetworkDisabled = true return nil, nil } if !containertypes.NetworkMode(idOrName).IsUserDefined() { if hasUserDefinedIPAddress(endpointConfig) { return nil, runconfig.ErrUnsupportedNetworkAndIP } if endpointConfig != nil && len(endpointConfig.Aliases) > 0 { return nil, runconfig.ErrUnsupportedNetworkAndAlias } } else { addShortID := true shortID := stringid.TruncateID(container.ID) for _, alias := range endpointConfig.Aliases { if alias == shortID { addShortID = false break } } if addShortID { endpointConfig.Aliases = append(endpointConfig.Aliases, shortID) } } n, err := daemon.FindNetwork(idOrName) if err != nil { return nil, err } if err := validateNetworkingConfig(n, endpointConfig); err != nil { return nil, err } if updateSettings { if err := daemon.updateNetworkSettings(container, n); err != nil { return nil, err } } return n, nil } func (daemon *Daemon) connectToNetwork(container *container.Container, idOrName string, endpointConfig *networktypes.EndpointSettings, updateSettings bool) (err error) { if endpointConfig == nil { endpointConfig = &networktypes.EndpointSettings{} } n, err := daemon.updateNetworkConfig(container, idOrName, endpointConfig, updateSettings) if err != nil { return err } if n == nil { return nil } controller := daemon.netController sb := daemon.getNetworkSandbox(container) createOptions, err := container.BuildCreateEndpointOptions(n, endpointConfig, sb) if err != nil { return err } endpointName := strings.TrimPrefix(container.Name, "/") ep, err := n.CreateEndpoint(endpointName, createOptions...) if err != nil { return err } defer func() { if err != nil { if e := ep.Delete(false); e != nil { logrus.Warnf("Could not rollback container connection to network %s", idOrName) } } }() container.NetworkSettings.Networks[n.Name()] = endpointConfig if err := daemon.updateEndpointNetworkSettings(container, n, ep); err != nil { return err } if sb == nil { options, err := daemon.buildSandboxOptions(container, n) if err != nil { return err } sb, err = controller.NewSandbox(container.ID, options...) if err != nil { return err } container.UpdateSandboxNetworkSettings(sb) } joinOptions, err := container.BuildJoinOptions(n) if err != nil { return err } if err := ep.Join(sb, joinOptions...); err != nil { return err } if err := container.UpdateJoinInfo(n, ep); err != nil { return fmt.Errorf("Updating join info failed: %v", err) } daemon.LogNetworkEventWithAttributes(n, "connect", map[string]string{"container": container.ID}) return nil } // ForceEndpointDelete deletes an endpoing from a network forcefully func (daemon *Daemon) ForceEndpointDelete(name string, n libnetwork.Network) error { ep, err := n.EndpointByName(name) if err != nil { return err } return ep.Delete(true) } func disconnectFromNetwork(container *container.Container, n libnetwork.Network, force bool) error { var ( ep libnetwork.Endpoint sbox libnetwork.Sandbox ) s := func(current libnetwork.Endpoint) bool { epInfo := current.Info() if epInfo == nil { return false } if sb := epInfo.Sandbox(); sb != nil { if sb.ContainerID() == container.ID { ep = current sbox = sb return true } } return false } n.WalkEndpoints(s) if ep == nil && force { epName := strings.TrimPrefix(container.Name, "/") ep, err := n.EndpointByName(epName) if err != nil { return err } return ep.Delete(force) } if ep == nil { return fmt.Errorf("container %s is not connected to the network", container.ID) } if err := ep.Leave(sbox); err != nil { return fmt.Errorf("container %s failed to leave network %s: %v", container.ID, n.Name(), err) } if err := ep.Delete(false); err != nil { return fmt.Errorf("endpoint delete failed for container %s on network %s: %v", container.ID, n.Name(), err) } delete(container.NetworkSettings.Networks, n.Name()) return nil } func (daemon *Daemon) initializeNetworking(container *container.Container) error { var err error if container.HostConfig.NetworkMode.IsContainer() { // we need to get the hosts files from the container to join nc, err := daemon.getNetworkedContainer(container.ID, container.HostConfig.NetworkMode.ConnectedContainer()) if err != nil { return err } container.HostnamePath = nc.HostnamePath container.HostsPath = nc.HostsPath container.ResolvConfPath = nc.ResolvConfPath container.Config.Hostname = nc.Config.Hostname container.Config.Domainname = nc.Config.Domainname return nil } if container.HostConfig.NetworkMode.IsHost() { container.Config.Hostname, err = os.Hostname() if err != nil { return err } } if err := daemon.allocateNetwork(container); err != nil { return err } return container.BuildHostnameFile() } func (daemon *Daemon) getNetworkedContainer(containerID, connectedContainerID string) (*container.Container, error) { nc, err := daemon.GetContainer(connectedContainerID) if err != nil { return nil, err } if containerID == nc.ID { return nil, fmt.Errorf("cannot join own network") } if !nc.IsRunning() { err := fmt.Errorf("cannot join network of a non running container: %s", connectedContainerID) return nil, derr.NewRequestConflictError(err) } if nc.IsRestarting() { return nil, errContainerIsRestarting(connectedContainerID) } return nc, nil } func (daemon *Daemon) releaseNetwork(container *container.Container) { if container.HostConfig.NetworkMode.IsContainer() || container.Config.NetworkDisabled { return } sid := container.NetworkSettings.SandboxID settings := container.NetworkSettings.Networks container.NetworkSettings.Ports = nil if sid == "" || len(settings) == 0 { return } var networks []libnetwork.Network for n, epSettings := range settings { if nw, err := daemon.FindNetwork(n); err == nil { networks = append(networks, nw) } cleanOperationalData(epSettings) } sb, err := daemon.netController.SandboxByID(sid) if err != nil { logrus.Warnf("error locating sandbox id %s: %v", sid, err) return } if err := sb.Delete(); err != nil { logrus.Errorf("Error deleting sandbox id %s for container %s: %v", sid, container.ID, err) } attributes := map[string]string{ "container": container.ID, } for _, nw := range networks { daemon.LogNetworkEventWithAttributes(nw, "disconnect", attributes) } }