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