feat(interfaces): Add support for interfaces file
This adds the ability for cloudinit to parse a debian interfaces file and generate the coresponding networkd configs.
This commit is contained in:
Alex Crawford
parent
f8a823cf7e
commit
38321fedce
193
network/interface.go
Normal file
193
network/interface.go
Normal file
@ -0,0 +1,193 @@
|
||||
package network
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"strconv"
|
||||
)
|
||||
|
||||
type InterfaceGenerator interface {
|
||||
Name() string
|
||||
Netdev() string
|
||||
Link() string
|
||||
Network() string
|
||||
}
|
||||
|
||||
type logicalInterface struct {
|
||||
name string
|
||||
config configMethod
|
||||
children []InterfaceGenerator
|
||||
}
|
||||
|
||||
func (i *logicalInterface) Network() string {
|
||||
config := fmt.Sprintf("[Match]\nName=%s\n\n[Network]\n", i.name)
|
||||
|
||||
for _, child := range i.children {
|
||||
switch iface := child.(type) {
|
||||
case *vlanInterface:
|
||||
config += fmt.Sprintf("VLAN=%s\n", iface.name)
|
||||
case *bondInterface:
|
||||
config += fmt.Sprintf("Bond=%s\n", iface.name)
|
||||
}
|
||||
}
|
||||
|
||||
switch conf := i.config.(type) {
|
||||
case configMethodStatic:
|
||||
for _, nameserver := range conf.nameservers {
|
||||
config += fmt.Sprintf("DNS=%s\n", nameserver)
|
||||
}
|
||||
if conf.address.IP != nil {
|
||||
config += fmt.Sprintf("\n[Address]\nAddress=%s\n", conf.address.String())
|
||||
}
|
||||
for _, route := range conf.routes {
|
||||
config += fmt.Sprintf("\n[Route]\nDestination=%s\nGateway=%s\n", route.destination.String(), route.gateway)
|
||||
}
|
||||
case configMethodDHCP:
|
||||
config += "DHCP=true\n"
|
||||
}
|
||||
|
||||
return config
|
||||
}
|
||||
|
||||
type physicalInterface struct {
|
||||
logicalInterface
|
||||
}
|
||||
|
||||
func (p *physicalInterface) Name() string {
|
||||
return p.name
|
||||
}
|
||||
|
||||
func (p *physicalInterface) Netdev() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
func (p *physicalInterface) Link() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
type bondInterface struct {
|
||||
logicalInterface
|
||||
slaves []string
|
||||
}
|
||||
|
||||
func (b *bondInterface) Name() string {
|
||||
return b.name
|
||||
}
|
||||
|
||||
func (b *bondInterface) Netdev() string {
|
||||
return fmt.Sprintf("[NetDev]\nKind=bond\nName=%s\n", b.name)
|
||||
}
|
||||
|
||||
func (b *bondInterface) Link() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
type vlanInterface struct {
|
||||
logicalInterface
|
||||
id int
|
||||
rawDevice string
|
||||
}
|
||||
|
||||
func (v *vlanInterface) Name() string {
|
||||
return v.name
|
||||
}
|
||||
|
||||
func (v *vlanInterface) Netdev() string {
|
||||
return fmt.Sprintf("[NetDev]\nKind=vlan\nName=%s\n\n[VLAN]\nId=%d\n", v.name, v.id)
|
||||
}
|
||||
|
||||
func (v *vlanInterface) Link() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
func buildInterfaces(stanzas []*stanzaInterface) []InterfaceGenerator {
|
||||
bondStanzas := make(map[string]*stanzaInterface)
|
||||
physicalStanzas := make(map[string]*stanzaInterface)
|
||||
vlanStanzas := make(map[string]*stanzaInterface)
|
||||
for _, iface := range stanzas {
|
||||
switch iface.kind {
|
||||
case interfaceBond:
|
||||
bondStanzas[iface.name] = iface
|
||||
case interfacePhysical:
|
||||
physicalStanzas[iface.name] = iface
|
||||
case interfaceVLAN:
|
||||
vlanStanzas[iface.name] = iface
|
||||
}
|
||||
}
|
||||
|
||||
physicals := make(map[string]*physicalInterface)
|
||||
for _, p := range physicalStanzas {
|
||||
if _, ok := p.configMethod.(configMethodLoopback); ok {
|
||||
continue
|
||||
}
|
||||
physicals[p.name] = &physicalInterface{
|
||||
logicalInterface{
|
||||
name: p.name,
|
||||
config: p.configMethod,
|
||||
children: []InterfaceGenerator{},
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
bonds := make(map[string]*bondInterface)
|
||||
for _, b := range bondStanzas {
|
||||
bonds[b.name] = &bondInterface{
|
||||
logicalInterface{
|
||||
name: b.name,
|
||||
config: b.configMethod,
|
||||
children: []InterfaceGenerator{},
|
||||
},
|
||||
b.options["slaves"],
|
||||
}
|
||||
}
|
||||
|
||||
vlans := make(map[string]*vlanInterface)
|
||||
for _, v := range vlanStanzas {
|
||||
var rawDevice string
|
||||
id, _ := strconv.Atoi(v.options["id"][0])
|
||||
if device := v.options["raw_device"]; len(device) == 1 {
|
||||
rawDevice = device[0]
|
||||
}
|
||||
vlans[v.name] = &vlanInterface{
|
||||
logicalInterface{
|
||||
name: v.name,
|
||||
config: v.configMethod,
|
||||
children: []InterfaceGenerator{},
|
||||
},
|
||||
id,
|
||||
rawDevice,
|
||||
}
|
||||
}
|
||||
|
||||
for _, vlan := range vlans {
|
||||
if physical, ok := physicals[vlan.rawDevice]; ok {
|
||||
physical.children = append(physical.children, vlan)
|
||||
}
|
||||
if bond, ok := bonds[vlan.rawDevice]; ok {
|
||||
bond.children = append(bond.children, vlan)
|
||||
}
|
||||
}
|
||||
|
||||
for _, bond := range bonds {
|
||||
for _, slave := range bond.slaves {
|
||||
if physical, ok := physicals[slave]; ok {
|
||||
physical.children = append(physical.children, bond)
|
||||
}
|
||||
if pBond, ok := bonds[slave]; ok {
|
||||
pBond.children = append(pBond.children, bond)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
interfaces := make([]InterfaceGenerator, 0, len(physicals)+len(bonds)+len(vlans))
|
||||
for _, physical := range physicals {
|
||||
interfaces = append(interfaces, physical)
|
||||
}
|
||||
for _, bond := range bonds {
|
||||
interfaces = append(interfaces, bond)
|
||||
}
|
||||
for _, vlan := range vlans {
|
||||
interfaces = append(interfaces, vlan)
|
||||
}
|
||||
|
||||
return interfaces
|
||||
}
|
||||
86
network/network.go
Normal file
86
network/network.go
Normal file
@ -0,0 +1,86 @@
|
||||
package network
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"os"
|
||||
"path"
|
||||
"strings"
|
||||
)
|
||||
|
||||
func ProcessDebianNetconf(config string) ([]InterfaceGenerator, error) {
|
||||
lines := formatConfig(config)
|
||||
stanzas, err := parseStanzas(lines)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
interfaces := make([]*stanzaInterface, 0, len(stanzas))
|
||||
for _, stanza := range stanzas {
|
||||
switch s := stanza.(type) {
|
||||
case *stanzaInterface:
|
||||
interfaces = append(interfaces, s)
|
||||
}
|
||||
}
|
||||
|
||||
return buildInterfaces(interfaces), nil
|
||||
}
|
||||
|
||||
func WriteConfigs(configPath string, interfaces []InterfaceGenerator) error {
|
||||
if err := os.MkdirAll(configPath, os.ModePerm+os.ModeDir); err != nil {
|
||||
fmt.Println(err)
|
||||
os.Exit(1)
|
||||
}
|
||||
|
||||
for _, iface := range interfaces {
|
||||
filename := path.Join(configPath, fmt.Sprintf("%s.netdev", iface.Name()))
|
||||
if err := writeConfig(filename, iface.GenerateNetdevConfig()); err != nil {
|
||||
return err
|
||||
}
|
||||
filename = path.Join(configPath, fmt.Sprintf("%s.link", iface.Name()))
|
||||
if err := writeConfig(filename, iface.GenerateLinkConfig()); err != nil {
|
||||
return err
|
||||
}
|
||||
filename = path.Join(configPath, fmt.Sprintf("%s.network", iface.Name()))
|
||||
if err := writeConfig(filename, iface.GenerateNetworkConfig()); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func writeConfig(filename string, config string) error {
|
||||
if config == "" {
|
||||
return nil
|
||||
}
|
||||
|
||||
if file, err := os.Create(filename); err == nil {
|
||||
io.WriteString(file, config)
|
||||
file.Close()
|
||||
return nil
|
||||
} else {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
func formatConfig(config string) []string {
|
||||
lines := []string{}
|
||||
config = strings.Replace(config, "\\\n", "", -1)
|
||||
for config != "" {
|
||||
split := strings.SplitN(config, "\n", 2)
|
||||
line := strings.TrimSpace(split[0])
|
||||
|
||||
if len(split) == 2 {
|
||||
config = split[1]
|
||||
} else {
|
||||
config = ""
|
||||
}
|
||||
|
||||
if strings.HasPrefix(line, "#") || line == "" {
|
||||
continue
|
||||
}
|
||||
|
||||
lines = append(lines, line)
|
||||
}
|
||||
return lines
|
||||
}
|
||||
295
network/stanza.go
Normal file
295
network/stanza.go
Normal file
@ -0,0 +1,295 @@
|
||||
package network
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"net"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
type stanza interface{}
|
||||
|
||||
type stanzaAuto struct {
|
||||
interfaces []string
|
||||
}
|
||||
|
||||
type stanzaInterface struct {
|
||||
name string
|
||||
kind interfaceKind
|
||||
auto bool
|
||||
configMethod configMethod
|
||||
options map[string][]string
|
||||
}
|
||||
|
||||
type interfaceKind int
|
||||
|
||||
const (
|
||||
interfaceBond = interfaceKind(iota)
|
||||
interfacePhysical
|
||||
interfaceVLAN
|
||||
)
|
||||
|
||||
type route struct {
|
||||
destination net.IPNet
|
||||
gateway net.IP
|
||||
}
|
||||
|
||||
type configMethod interface{}
|
||||
|
||||
type configMethodStatic struct {
|
||||
address net.IPNet
|
||||
nameservers []net.IP
|
||||
routes []route
|
||||
}
|
||||
|
||||
type configMethodLoopback struct{}
|
||||
|
||||
type configMethodManual struct{}
|
||||
|
||||
type configMethodDHCP struct{}
|
||||
|
||||
func parseStanzas(lines []string) (stanzas []stanza, err error) {
|
||||
rawStanzas, err := splitStanzas(lines)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
stanzas = make([]stanza, 0, len(rawStanzas))
|
||||
for _, rawStanza := range rawStanzas {
|
||||
if stanza, err := parseStanza(rawStanza); err == nil {
|
||||
stanzas = append(stanzas, stanza)
|
||||
} else {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
|
||||
autos := make([]string, 0)
|
||||
interfaceMap := make(map[string]*stanzaInterface)
|
||||
for _, stanza := range stanzas {
|
||||
switch c := stanza.(type) {
|
||||
case *stanzaAuto:
|
||||
autos = append(autos, c.interfaces...)
|
||||
case *stanzaInterface:
|
||||
interfaceMap[c.name] = c
|
||||
}
|
||||
}
|
||||
|
||||
// Apply the auto attribute
|
||||
for _, auto := range autos {
|
||||
if iface, ok := interfaceMap[auto]; ok {
|
||||
iface.auto = true
|
||||
}
|
||||
}
|
||||
|
||||
return stanzas, nil
|
||||
}
|
||||
|
||||
func splitStanzas(lines []string) ([][]string, error) {
|
||||
var curStanza []string
|
||||
stanzas := make([][]string, 0)
|
||||
for _, line := range lines {
|
||||
if isStanzaStart(line) {
|
||||
if curStanza != nil {
|
||||
stanzas = append(stanzas, curStanza)
|
||||
}
|
||||
curStanza = []string{line}
|
||||
} else if curStanza != nil {
|
||||
curStanza = append(curStanza, line)
|
||||
} else {
|
||||
return nil, fmt.Errorf("missing stanza start '%s'", line)
|
||||
}
|
||||
}
|
||||
|
||||
if curStanza != nil {
|
||||
stanzas = append(stanzas, curStanza)
|
||||
}
|
||||
|
||||
return stanzas, nil
|
||||
}
|
||||
|
||||
func isStanzaStart(line string) bool {
|
||||
switch strings.Split(line, " ")[0] {
|
||||
case "auto":
|
||||
fallthrough
|
||||
case "iface":
|
||||
fallthrough
|
||||
case "mapping":
|
||||
return true
|
||||
}
|
||||
|
||||
if strings.HasPrefix(line, "allow-") {
|
||||
return true
|
||||
}
|
||||
|
||||
return false
|
||||
}
|
||||
|
||||
func parseStanza(rawStanza []string) (stanza, error) {
|
||||
if len(rawStanza) == 0 {
|
||||
panic("empty stanza")
|
||||
}
|
||||
tokens := strings.Fields(rawStanza[0])
|
||||
if len(tokens) < 2 {
|
||||
return nil, fmt.Errorf("malformed stanza start %q", rawStanza[0])
|
||||
}
|
||||
|
||||
kind := tokens[0]
|
||||
attributes := tokens[1:]
|
||||
|
||||
switch kind {
|
||||
case "auto":
|
||||
return parseAutoStanza(attributes, rawStanza[1:])
|
||||
case "iface":
|
||||
return parseInterfaceStanza(attributes, rawStanza[1:])
|
||||
default:
|
||||
return nil, fmt.Errorf("unknown stanza '%s'", kind)
|
||||
}
|
||||
}
|
||||
|
||||
func parseAutoStanza(attributes []string, options []string) (*stanzaAuto, error) {
|
||||
return &stanzaAuto{interfaces: attributes}, nil
|
||||
}
|
||||
|
||||
func parseInterfaceStanza(attributes []string, options []string) (*stanzaInterface, error) {
|
||||
if len(attributes) != 3 {
|
||||
return nil, fmt.Errorf("incorrect number of attributes")
|
||||
}
|
||||
|
||||
iface := attributes[0]
|
||||
confMethod := attributes[2]
|
||||
|
||||
optionMap := make(map[string][]string, 0)
|
||||
for _, option := range options {
|
||||
if strings.HasPrefix(option, "post-up") {
|
||||
tokens := strings.SplitAfterN(option, " ", 2)
|
||||
if len(tokens) != 2 {
|
||||
continue
|
||||
}
|
||||
if v, ok := optionMap["post-up"]; ok {
|
||||
optionMap["post-up"] = append(v, tokens[1])
|
||||
} else {
|
||||
optionMap["post-up"] = []string{tokens[1]}
|
||||
}
|
||||
} else if strings.HasPrefix(option, "pre-down") {
|
||||
tokens := strings.SplitAfterN(option, " ", 2)
|
||||
if len(tokens) != 2 {
|
||||
continue
|
||||
}
|
||||
if v, ok := optionMap["pre-down"]; ok {
|
||||
optionMap["pre-down"] = append(v, tokens[1])
|
||||
} else {
|
||||
optionMap["pre-down"] = []string{tokens[1]}
|
||||
}
|
||||
} else {
|
||||
tokens := strings.Fields(option)
|
||||
optionMap[tokens[0]] = tokens[1:]
|
||||
}
|
||||
}
|
||||
|
||||
var conf configMethod
|
||||
switch confMethod {
|
||||
case "static":
|
||||
config := configMethodStatic{
|
||||
routes: make([]route, 0),
|
||||
nameservers: make([]net.IP, 0),
|
||||
}
|
||||
if addresses, ok := optionMap["address"]; ok {
|
||||
if len(addresses) == 1 {
|
||||
config.address.IP = net.ParseIP(addresses[0])
|
||||
}
|
||||
}
|
||||
if netmasks, ok := optionMap["netmask"]; ok {
|
||||
if len(netmasks) == 1 {
|
||||
config.address.Mask = net.IPMask(net.ParseIP(netmasks[0]).To4())
|
||||
}
|
||||
}
|
||||
if config.address.IP == nil || config.address.Mask == nil {
|
||||
return nil, fmt.Errorf("malformed static network config for '%s'", iface)
|
||||
}
|
||||
if gateways, ok := optionMap["gateway"]; ok {
|
||||
if len(gateways) == 1 {
|
||||
config.routes = append(config.routes, route{
|
||||
destination: net.IPNet{
|
||||
IP: net.IPv4(0, 0, 0, 0),
|
||||
Mask: net.IPv4Mask(0, 0, 0, 0),
|
||||
},
|
||||
gateway: net.ParseIP(gateways[0]),
|
||||
})
|
||||
}
|
||||
}
|
||||
for _, nameserver := range optionMap["dns-nameservers"] {
|
||||
config.nameservers = append(config.nameservers, net.ParseIP(nameserver))
|
||||
}
|
||||
for _, postup := range optionMap["post-up"] {
|
||||
if strings.HasPrefix(postup, "route add") {
|
||||
route := route{}
|
||||
fields := strings.Fields(postup)
|
||||
for i, field := range fields[:len(fields)-1] {
|
||||
switch field {
|
||||
case "-net":
|
||||
route.destination.IP = net.ParseIP(fields[i+1])
|
||||
case "netmask":
|
||||
route.destination.Mask = net.IPMask(net.ParseIP(fields[i+1]).To4())
|
||||
case "gw":
|
||||
route.gateway = net.ParseIP(fields[i+1])
|
||||
}
|
||||
}
|
||||
if route.destination.IP != nil && route.destination.Mask != nil && route.gateway != nil {
|
||||
config.routes = append(config.routes, route)
|
||||
}
|
||||
}
|
||||
}
|
||||
conf = config
|
||||
case "loopback":
|
||||
conf = configMethodLoopback{}
|
||||
case "manual":
|
||||
conf = configMethodManual{}
|
||||
case "dhcp":
|
||||
conf = configMethodDHCP{}
|
||||
default:
|
||||
return nil, fmt.Errorf("invalid config method '%s'", confMethod)
|
||||
}
|
||||
|
||||
if _, ok := optionMap["vlan_raw_device"]; ok {
|
||||
return parseVLANStanza(iface, conf, attributes, optionMap)
|
||||
}
|
||||
|
||||
if strings.Contains(iface, ".") {
|
||||
return parseVLANStanza(iface, conf, attributes, optionMap)
|
||||
}
|
||||
|
||||
if _, ok := optionMap["bond-slaves"]; ok {
|
||||
return parseBondStanza(iface, conf, attributes, optionMap)
|
||||
}
|
||||
|
||||
return parsePhysicalStanza(iface, conf, attributes, optionMap)
|
||||
}
|
||||
|
||||
func parseBondStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
|
||||
options["slaves"] = options["bond-slaves"]
|
||||
return &stanzaInterface{name: iface, kind: interfaceBond, configMethod: conf, options: options}, nil
|
||||
}
|
||||
|
||||
func parsePhysicalStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
|
||||
return &stanzaInterface{name: iface, kind: interfacePhysical, configMethod: conf, options: options}, nil
|
||||
}
|
||||
|
||||
func parseVLANStanza(iface string, conf configMethod, attributes []string, options map[string][]string) (*stanzaInterface, error) {
|
||||
var id string
|
||||
if strings.Contains(iface, ".") {
|
||||
tokens := strings.Split(iface, ".")
|
||||
id = tokens[len(tokens)-1]
|
||||
} else if strings.HasPrefix(iface, "vlan") {
|
||||
id = strings.TrimPrefix(iface, "vlan")
|
||||
} else {
|
||||
return nil, fmt.Errorf("malformed vlan name %s", iface)
|
||||
}
|
||||
|
||||
if _, err := strconv.Atoi(id); err != nil {
|
||||
return nil, fmt.Errorf("malformed vlan name %s", iface)
|
||||
}
|
||||
options["id"] = []string{id}
|
||||
options["raw_device"] = options["vlan_raw_device"]
|
||||
|
||||
return &stanzaInterface{name: iface, kind: interfaceVLAN, configMethod: conf, options: options}, nil
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user