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windows_net_manager.go
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windows_net_manager.go
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package net
import (
"fmt"
gonet "net"
"os"
"path/filepath"
"strings"
"time"
"code.cloudfoundry.org/clock"
boshsettings "github.com/cloudfoundry/bosh-agent/settings"
boshdirs "github.com/cloudfoundry/bosh-agent/settings/directories"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshlog "github.com/cloudfoundry/bosh-utils/logger"
boshsys "github.com/cloudfoundry/bosh-utils/system"
)
type MACAddressDetector interface {
MACAddresses() (map[string]string, error)
}
func NewMACAddressDetector() MACAddressDetector {
return macAddressDetector{}
}
type macAddressDetector struct{}
func (m macAddressDetector) MACAddresses() (map[string]string, error) {
ifs, err := gonet.Interfaces()
if err != nil {
return nil, bosherr.WrapError(err, "Detecting Mac Addresses")
}
macs := make(map[string]string, len(ifs))
for _, f := range ifs {
macs[f.HardwareAddr.String()] = f.Name
}
return macs, nil
}
type WindowsNetManager struct {
runner boshsys.CmdRunner
interfaceConfigurationCreator InterfaceConfigurationCreator
macAddressDetector MACAddressDetector
logTag string
logger boshlog.Logger
clock clock.Clock
fs boshsys.FileSystem
dirProvider boshdirs.Provider
}
func NewWindowsNetManager(
runner boshsys.CmdRunner,
interfaceConfigurationCreator InterfaceConfigurationCreator,
macAddressDetector MACAddressDetector,
logger boshlog.Logger,
clock clock.Clock,
fs boshsys.FileSystem,
dirProvider boshdirs.Provider,
) Manager {
return WindowsNetManager{
runner: runner,
interfaceConfigurationCreator: interfaceConfigurationCreator,
macAddressDetector: macAddressDetector,
logTag: "WindowsNetManager",
logger: logger,
clock: clock,
fs: fs,
dirProvider: dirProvider,
}
}
const (
SetDNSTemplate = `
[array]$interfaces = Get-DNSClientServerAddress
$dns = @("%s")
foreach($interface in $interfaces) {
Set-DnsClientServerAddress -InterfaceAlias $interface.InterfaceAlias -ServerAddresses ($dns -join ",")
}
`
ResetDNSTemplate = `
[array]$interfaces = Get-DNSClientServerAddress
foreach($interface in $interfaces) {
Set-DnsClientServerAddress -InterfaceAlias $interface.InterfaceAlias -ResetServerAddresses
}
`
NicSettingsTemplate = `
$connectionName=(get-wmiobject win32_networkadapter | where-object {$_.MacAddress -eq '%s'}).netconnectionid
netsh interface ip set address $connectionName static %s %s %s
`
)
func (net WindowsNetManager) configuredInterfacesFile() string {
return filepath.Join(net.dirProvider.BoshDir(), "configured_interfaces.txt")
}
// GetConfiguredNetworkInterfaces returns all of the network interfaces if a
// previous call to SetupNetworking succeeded as indicated by the presence of
// a file ("configured_interfaces.txt").
//
// A file is used because there is no good way to determine if network
// interfaces are configured on Windows and SetupNetworking may be called
// during bootstrap so it is possible the agent will have restarted since
// it the last call.
//
// We return all of the network interfaces as we configure DNS for all of the
// network interfaces. Apart from DNS, the returned network interfaces may
// not have been configured.
//
func (net WindowsNetManager) GetConfiguredNetworkInterfaces() ([]string, error) {
// TODO (CEV): This function is only used by the ensureMinimalNetworkSetup
// of HTTPMetadataService to determine if networks have been configured by
// asserting the length of the returned slice is not zero. On Linux, this
// might be okay, but since this function is not accurate on Windows there
// is a danger that another function will treat its output as a canonical
// list of configured interfaces. A better solution might be to change
// the Platform.GetConfiguredNetworkInterfaces interface to something that
// simply reports whether the interfaces have been configured and let each
// OS handle determine that their own way.
net.logger.Info(net.logTag, "Getting Configured Network Interfaces...")
path := net.configuredInterfacesFile()
if _, err := net.fs.Stat(path); err != nil {
if os.IsNotExist(err) {
net.logger.Info(net.logTag, "No network interfaces file")
return []string{}, nil
}
return nil, bosherr.WrapErrorf(err, "Statting dns configuration file: %s", path)
}
net.logger.Info(net.logTag, "Found network interfaces file")
ifs, err := gonet.Interfaces()
if err != nil {
return nil, bosherr.WrapErrorf(err, "Getting network interfaces: %s", err)
}
names := make([]string, 0, len(ifs))
for _, f := range ifs {
names = append(names, f.Name)
}
return names, nil
}
func (net WindowsNetManager) createConfiguredInterfacesFile() error {
net.logger.Info(net.logTag, "Creating Configured Network Interfaces file...")
path := net.configuredInterfacesFile()
if _, err := net.fs.Stat(path); os.IsNotExist(err) {
f, err := net.fs.OpenFile(path, os.O_CREATE, 0644)
if err != nil {
return bosherr.WrapErrorf(err, "Creating configured interfaces file: %s", err)
}
f.Close()
}
return nil
}
func (net WindowsNetManager) ComputeNetworkConfig(networks boshsettings.Networks) (
[]StaticInterfaceConfiguration,
[]DHCPInterfaceConfiguration,
[]string,
error,
) {
nonVipNetworks := boshsettings.Networks{}
for networkName, networkSettings := range networks {
if networkSettings.IsVIP() {
continue
}
nonVipNetworks[networkName] = networkSettings
}
staticConfigs, dhcpConfigs, err := net.buildInterfaces(nonVipNetworks)
if err != nil {
return nil, nil, nil, err
}
dnsNetwork, _ := nonVipNetworks.DefaultNetworkFor("dns")
dnsServers := dnsNetwork.DNS
return staticConfigs, dhcpConfigs, dnsServers, nil
}
func (net WindowsNetManager) SetupIPv6(_ boshsettings.IPv6, _ <-chan struct{}) error { return nil }
func (net WindowsNetManager) SetupNetworking(networks boshsettings.Networks, errCh chan error) error {
nonVipNetworks := boshsettings.Networks{}
for networkName, networkSettings := range networks {
if networkSettings.IsVIP() {
continue
}
nonVipNetworks[networkName] = networkSettings
}
staticConfigs, _, dnsServers, err := net.ComputeNetworkConfig(networks)
if err != nil {
return bosherr.WrapError(err, "Computing network configuration")
}
if err := net.setupInterfaces(staticConfigs); err != nil {
return err
}
if err := net.setupDNS(dnsServers); err != nil {
return err
}
if err := net.createConfiguredInterfacesFile(); err != nil {
return bosherr.WrapError(err, "Writing configured network interfaces")
}
net.clock.Sleep(5 * time.Second)
return nil
}
func (net WindowsNetManager) setupInterfaces(staticConfigs []StaticInterfaceConfiguration) error {
for _, conf := range staticConfigs {
var gateway string
if conf.IsDefaultForGateway {
gateway = conf.Gateway
}
content := fmt.Sprintf(NicSettingsTemplate, conf.Mac, conf.Address, conf.Netmask, gateway)
_, _, _, err := net.runner.RunCommand("-Command", content)
if err != nil {
return bosherr.WrapError(err, "Configuring interface")
}
}
return nil
}
func (net WindowsNetManager) buildInterfaces(networks boshsettings.Networks) (
[]StaticInterfaceConfiguration,
[]DHCPInterfaceConfiguration,
error,
) {
interfacesByMacAddress, err := net.macAddressDetector.MACAddresses()
if err != nil {
return nil, nil, bosherr.WrapError(err, "Getting network interfaces")
}
staticConfigs, dhcpConfigs, err := net.interfaceConfigurationCreator.CreateInterfaceConfigurations(
networks, interfacesByMacAddress)
if err != nil {
return nil, nil, bosherr.WrapError(err, "Creating interface configurations")
}
return staticConfigs, dhcpConfigs, nil
}
func (net WindowsNetManager) setupDNS(dnsServers []string) error {
net.logger.Info(net.logTag, "Setting up DNS...")
var content string
if len(dnsServers) > 0 {
net.logger.Info(net.logTag, "Setting DNS servers: %v", dnsServers)
content = fmt.Sprintf(SetDNSTemplate, strings.Join(dnsServers, `","`))
} else {
net.logger.Info(net.logTag, "Resetting DNS servers")
content = ResetDNSTemplate
}
_, _, _, err := net.runner.RunCommand("-Command", content)
if err != nil {
return bosherr.WrapError(err, "Setting DNS servers")
}
return nil
}