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ubuntu_net_manager.go
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ubuntu_net_manager.go
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package net
import (
"bytes"
"path/filepath"
"regexp"
"strconv"
"strings"
"text/template"
bosherr "github.com/cloudfoundry/bosh-agent/errors"
boshlog "github.com/cloudfoundry/bosh-agent/logger"
bosharp "github.com/cloudfoundry/bosh-agent/platform/net/arp"
boship "github.com/cloudfoundry/bosh-agent/platform/net/ip"
boshsettings "github.com/cloudfoundry/bosh-agent/settings"
boshsys "github.com/cloudfoundry/bosh-agent/system"
)
const ubuntuNetManagerLogTag = "ubuntuNetManager"
var (
ifupVersion07Regex = regexp.MustCompile(`ifup version 0\.7`)
ubuntuMajorVersionRegex = regexp.MustCompile("DISTRIB_RELEASE=([^.]*)")
)
type ubuntuNetManager struct {
DefaultNetworkResolver
cmdRunner boshsys.CmdRunner
fs boshsys.FileSystem
ipResolver boship.Resolver
addressBroadcaster bosharp.AddressBroadcaster
logger boshlog.Logger
}
func NewUbuntuNetManager(
fs boshsys.FileSystem,
cmdRunner boshsys.CmdRunner,
defaultNetworkResolver DefaultNetworkResolver,
ipResolver boship.Resolver,
addressBroadcaster bosharp.AddressBroadcaster,
logger boshlog.Logger,
) ubuntuNetManager {
return ubuntuNetManager{
DefaultNetworkResolver: defaultNetworkResolver,
cmdRunner: cmdRunner,
fs: fs,
ipResolver: ipResolver,
addressBroadcaster: addressBroadcaster,
logger: logger,
}
}
func (net ubuntuNetManager) SetupDhcp(networks boshsettings.Networks, errCh chan error) error {
net.logger.Debug(ubuntuNetManagerLogTag, "Configuring DHCP networking")
err := net.writeDhcpNetworkInterfaces()
if err != nil {
return bosherr.WrapError(err, "Generating interfaces config from template")
}
buffer := bytes.NewBuffer([]byte{})
t := template.Must(template.New("dhcp-config").Parse(ubuntuDHCPConfigTemplate))
// Keep DNS servers in the order specified by the network
// because they are added by a *single* DHCP's prepend command
dnsNetwork, _ := networks.DefaultNetworkFor("dns")
dnsServersList := strings.Join(dnsNetwork.DNS, ", ")
err = t.Execute(buffer, dnsServersList)
if err != nil {
return bosherr.WrapError(err, "Generating config from template")
}
dhclientConfigFile := net.dhclientConfigFile()
written, err := net.fs.ConvergeFileContents(dhclientConfigFile, buffer.Bytes())
if err != nil {
return bosherr.WrapErrorf(err, "Writing to %s", dhclientConfigFile)
}
if written {
args := net.restartNetworkArguments()
net.logger.Debug(ubuntuNetManagerLogTag, "Restarting network interfaces")
_, _, _, err := net.cmdRunner.RunCommand("ifdown", args...)
if err != nil {
net.logger.Error(ubuntuNetManagerLogTag, "Ignoring ifdown failure: %s", err.Error())
}
_, _, _, err = net.cmdRunner.RunCommand("ifup", args...)
if err != nil {
net.logger.Error(ubuntuNetManagerLogTag, "Ignoring ifup failure: %s", err.Error())
}
}
addresses := []boship.InterfaceAddress{
// eth0 is hard coded in AWS and OpenStack stemcells.
// TODO: abstract hardcoded network interface name to the Manager
boship.NewResolvingInterfaceAddress("eth0", net.ipResolver),
}
go func() {
net.addressBroadcaster.BroadcastMACAddresses(addresses)
if errCh != nil {
errCh <- nil
}
}()
return nil
}
// DHCP Config file - /etc/dhcp3/dhclient.conf
// Ubuntu 14.04 accepts several DNS as a list in a single prepend directive
const ubuntuDHCPConfigTemplate = `# Generated by bosh-agent
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
send host-name "<hostname>";
request subnet-mask, broadcast-address, time-offset, routers,
domain-name, domain-name-servers, domain-search, host-name,
netbios-name-servers, netbios-scope, interface-mtu,
rfc3442-classless-static-routes, ntp-servers;
{{ if . }}
prepend domain-name-servers {{ . }};{{ end }}
`
func (net ubuntuNetManager) SetupManualNetworking(networks boshsettings.Networks, errCh chan error) error {
net.logger.Debug(ubuntuNetManagerLogTag, "Configuring manual networking")
configureDNSInNetworkInterfaces, err := net.isDNSConfigurableInNetworkInterfaces()
if err != nil {
return bosherr.WrapError(err, "Determining dns configuration")
}
modifiedNetworks, written, err := net.writeNetworkInterfaces(networks, configureDNSInNetworkInterfaces)
if err != nil {
return bosherr.WrapError(err, "Writing network interfaces")
}
if written {
net.restartNetworkingInterfaces(modifiedNetworks)
}
if !configureDNSInNetworkInterfaces {
err = net.writeResolvConf(networks)
if err != nil {
return bosherr.WrapError(err, "Writing resolv.conf")
}
}
addresses := toInterfaceAddresses(modifiedNetworks)
go func() {
net.addressBroadcaster.BroadcastMACAddresses(addresses)
if errCh != nil {
errCh <- nil
}
}()
return nil
}
func (net ubuntuNetManager) writeNetworkInterfaces(networks boshsettings.Networks, configureDNS bool) ([]customNetwork, bool, error) {
var modifiedNetworks []customNetwork
macAddresses, err := net.detectMacAddresses()
if err != nil {
return modifiedNetworks, false, bosherr.WrapError(err, "Detecting mac addresses")
}
for _, aNet := range networks {
network, broadcast, err := boshsys.CalculateNetworkAndBroadcast(aNet.IP, aNet.Netmask)
if err != nil {
return modifiedNetworks, false, bosherr.WrapError(err, "Calculating network and broadcast")
}
newNet := customNetwork{
aNet,
macAddresses[aNet.Mac],
network,
broadcast,
true,
}
modifiedNetworks = append(modifiedNetworks, newNet)
}
networkInterfaceValues := networkInterfaceConfigArg{
Networks: modifiedNetworks,
HasDNSNameServers: false,
}
buffer := bytes.NewBuffer([]byte{})
if configureDNS {
dnsNetwork, _ := networks.DefaultNetworkFor("dns")
networkInterfaceValues.HasDNSNameServers = true
networkInterfaceValues.DNSServers = dnsNetwork.DNS
}
t := template.Must(template.New("network-interfaces").Parse(networkInterfacesTemplate))
err = t.Execute(buffer, networkInterfaceValues)
if err != nil {
return modifiedNetworks, false, bosherr.WrapError(err, "Generating config from template")
}
written, err := net.fs.ConvergeFileContents("/etc/network/interfaces", buffer.Bytes())
if err != nil {
return modifiedNetworks, false, bosherr.WrapError(err, "Writing to /etc/network/interfaces")
}
return modifiedNetworks, written, nil
}
const networkInterfacesTemplate = `# Generated by bosh-agent
auto lo
iface lo inet loopback
{{ range .Networks }}
auto {{ .Interface }}
iface {{ .Interface }} inet static
address {{ .IP }}
network {{ .NetworkIP }}
netmask {{ .Netmask }}
broadcast {{ .Broadcast }}
{{ if .HasDefaultGateway }} gateway {{ .Gateway }}{{ end }}{{ end }}
{{ if .HasDNSNameServers }}dns-nameservers{{ range .DNSServers }} {{ . }}{{ end }}{{ end }}`
func (net ubuntuNetManager) writeResolvConf(networks boshsettings.Networks) error {
net.logger.Debug(ubuntuNetManagerLogTag, "Writing resolv.conf")
buffer := bytes.NewBuffer([]byte{})
t := template.Must(template.New("resolv-conf").Parse(ubuntuResolvConfTemplate))
// Keep DNS servers in the order specified by the network
dnsNetwork, _ := networks.DefaultNetworkFor("dns")
dnsServersArg := dnsConfigArg{dnsNetwork.DNS}
err := t.Execute(buffer, dnsServersArg)
if err != nil {
return bosherr.WrapError(err, "Generating config from template")
}
err = net.fs.WriteFile("/etc/resolv.conf", buffer.Bytes())
if err != nil {
return bosherr.WrapError(err, "Writing to /etc/resolv.conf")
}
return nil
}
const ubuntuResolvConfTemplate = `# Generated by bosh-agent
{{ range .DNSServers }}nameserver {{ . }}
{{ end }}`
func (net ubuntuNetManager) detectMacAddresses() (map[string]string, error) {
addresses := map[string]string{}
filePaths, err := net.fs.Glob("/sys/class/net/*")
if err != nil {
return addresses, bosherr.WrapError(err, "Getting file list from /sys/class/net")
}
var macAddress string
for _, filePath := range filePaths {
macAddress, err = net.fs.ReadFileString(filepath.Join(filePath, "address"))
if err != nil {
return addresses, bosherr.WrapError(err, "Reading mac address from file")
}
macAddress = strings.Trim(macAddress, "\n")
interfaceName := filepath.Base(filePath)
addresses[macAddress] = interfaceName
}
return addresses, nil
}
func (net ubuntuNetManager) restartNetworkingInterfaces(networks []customNetwork) {
for _, network := range networks {
net.logger.Debug(ubuntuNetManagerLogTag, "Restarting network interface %s", network.Interface)
_, _, _, err := net.cmdRunner.RunCommand("service", "network-interface", "stop", "INTERFACE="+network.Interface)
if err != nil {
net.logger.Error(ubuntuNetManagerLogTag, "Ignoring network stop failure: %s", err.Error())
}
_, _, _, err = net.cmdRunner.RunCommand("service", "network-interface", "start", "INTERFACE="+network.Interface)
if err != nil {
net.logger.Error(ubuntuNetManagerLogTag, "Ignoring network start failure: %s", err.Error())
}
}
}
func (net ubuntuNetManager) dhclientConfigFile() string {
if net.cmdRunner.CommandExists("dhclient3") {
// Using dhclient3
return "/etc/dhcp3/dhclient.conf"
}
return "/etc/dhcp/dhclient.conf"
}
func (net ubuntuNetManager) restartNetworkArguments() []string {
stdout, _, _, err := net.cmdRunner.RunCommand("ifup", "--version")
if err != nil {
net.logger.Error(ubuntuNetManagerLogTag, "Ignoring ifup version failure: %s", err.Error())
}
// Check if command accepts --no-loopback argument
// --exclude does not work with ifup > 0.7 which comes in Ubuntu 14.04
if ifupVersion07Regex.MatchString(stdout) {
return []string{"-a", "--no-loopback"}
}
return []string{"-a", "--exclude=lo"}
}
func (net ubuntuNetManager) ubuntuMajorVersion() (int, error) {
contents, err := net.fs.ReadFileString("/etc/lsb-release")
if err != nil {
return 0, err
}
matchesReg := ubuntuMajorVersionRegex.FindStringSubmatch(contents)
return strconv.Atoi(matchesReg[1])
}
func (net ubuntuNetManager) isDNSConfigurableInNetworkInterfaces() (bool, error) {
ubuntuMajorVersion, err := net.ubuntuMajorVersion()
if err != nil {
return false, bosherr.WrapError(err, "Invalid Ubuntu major version")
}
const ubuntuTrustyMajorVersion = 14
return ubuntuMajorVersion >= ubuntuTrustyMajorVersion, nil
}
func (net ubuntuNetManager) writeDhcpNetworkInterfaces() error {
interfaces, err := net.detectNetworkInterfaces()
if err != nil {
return bosherr.WrapError(err, "Detecting network interfaces")
}
buffer := bytes.NewBuffer([]byte{})
t := template.Must(template.New("network-interfaces").Parse(ubuntuDhcpNetworkInterfacesTemplate))
err = t.Execute(buffer, interfaces)
if err != nil {
return bosherr.WrapError(err, "Generating config from template")
}
_, err = net.fs.ConvergeFileContents("/etc/network/interfaces", buffer.Bytes())
if err != nil {
return bosherr.WrapError(err, "Writing to /etc/network/interfaces")
}
return nil
}
const ubuntuDhcpNetworkInterfacesTemplate = `# Generated by bosh-agent
auto lo
iface lo inet loopback
{{ range . }}
auto {{ . }}
iface {{ . }} inet dhcp
{{ end }}`
func (net ubuntuNetManager) detectNetworkInterfaces() ([]string, error) {
interfaces := []string{}
filePaths, err := net.fs.Glob("/sys/class/net/*")
if err != nil {
return nil, bosherr.WrapError(err, "Getting file list from /sys/class/net")
}
for _, filePath := range filePaths {
exists := net.fs.FileExists(filepath.Join(filePath, "device"))
if !exists {
net.logger.Info(ubuntuNetManagerLogTag, "Ignoring virtual network device: %s", filePath)
continue
}
interfaceName := filepath.Base(filePath)
interfaces = append(interfaces, interfaceName)
}
return interfaces, nil
}