added network config
This commit is contained in:
Benjamin Böhmke
parent
ce335164ff
commit
d7e0591576
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@ -1 +1,2 @@
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.idea/
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test_*
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@ -0,0 +1,5 @@
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module gitlab.com/bboehmke/raspi-alpine-builder
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go 1.13
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require github.com/stretchr/testify v1.4.0
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@ -0,0 +1,13 @@
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github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/iris-contrib/go.uuid v2.0.0+incompatible/go.mod h1:iz2lgM/1UnEf1kP0L/+fafWORmlnuysV2EMP8MW+qe0=
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github.com/kataras/iris v11.1.1+incompatible/go.mod h1:ki9XPua5SyAJbIxDdsssxevgGrbpBmmvoQmo/A0IodY=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
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github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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@ -0,0 +1,171 @@
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package alpine_builder
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"regexp"
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"strings"
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)
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// network configuration
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var networkConfig = "/data/etc/network/interfaces"
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var networkInterface = "eth0"
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// regular expressions
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var reSectionStart = regexp.MustCompile("^(iface|mapping|auto|allow-|source)")
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var reIface = regexp.MustCompile("^iface (\\w+) inet (\\w+)")
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var reStaticAddress = regexp.MustCompile("^(\\s*)address ([0-9.]+)")
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var reStaticNetmask = regexp.MustCompile("^(\\s*)netmask ([0-9.]+)")
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var reStaticGateway = regexp.MustCompile("^(\\s*)gateway ([0-9.]+)")
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// NetworkInfo represents the actual network configuration
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type NetworkInfo struct {
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IsStatic bool
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Address string
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Netmask string
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Gateway string
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}
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// GetNetworkInfo from config file
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func GetNetworkInfo() (*NetworkInfo, error) {
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// load config file
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file, err := os.Open(networkConfig)
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if err != nil {
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return nil, fmt.Errorf("failed to open network config: %w", err)
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}
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defer file.Close()
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var info *NetworkInfo
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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// check for section start
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if reSectionStart.MatchString(line) {
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infLine := reIface.FindStringSubmatch(line)
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if infLine != nil {
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// interface found
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if infLine[1] == networkInterface {
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info = &NetworkInfo{
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IsStatic: infLine[2] == "static",
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}
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}
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} else {
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// info set -> stop here
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if info != nil {
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break
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}
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}
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} else if info != nil {
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// interface config
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address := reStaticAddress.FindStringSubmatch(line)
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if address != nil {
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info.Address = address[2]
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}
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netmask := reStaticNetmask.FindStringSubmatch(line)
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if netmask != nil {
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info.Netmask = netmask[2]
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}
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gateway := reStaticGateway.FindStringSubmatch(line)
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if gateway != nil {
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info.Gateway = gateway[2]
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}
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}
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}
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if info != nil {
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return info, nil
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}
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return nil, errors.New("invalid network config")
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}
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// NetworkEnableDHCP configures the network to use DHCP client
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func NetworkEnableDHCP() error {
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// load config file
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file, err := os.Open(networkConfig)
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if err != nil {
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return fmt.Errorf("failed to open network config: %w", err)
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}
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defer file.Close()
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var buffer bytes.Buffer
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var infFound bool
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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// check for section start
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if reSectionStart.MatchString(line) {
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infLine := reIface.FindStringSubmatch(line)
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if infLine != nil {
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// interface found
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if infLine[1] == networkInterface {
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infFound = true
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buffer.WriteString(fmt.Sprintf("iface %s inet dhcp\n", networkInterface))
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continue
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}
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} else {
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if infFound {
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infFound = false
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}
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}
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buffer.WriteString(line + "\n")
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} else if !infFound {
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buffer.WriteString(line + "\n")
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}
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}
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// write config file
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return ioutil.WriteFile(networkConfig, buffer.Bytes(), os.ModePerm)
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}
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// NetworkSetStatic IP configuration
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func NetworkSetStatic(address, netmask, gateway string) error {
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// load config file
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file, err := os.Open(networkConfig)
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if err != nil {
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return fmt.Errorf("failed to open network config: %w", err)
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}
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defer file.Close()
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var buffer bytes.Buffer
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var infFound bool
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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line := strings.TrimSpace(scanner.Text())
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// check for section start
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if reSectionStart.MatchString(line) {
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infLine := reIface.FindStringSubmatch(line)
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if infLine != nil {
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// interface found
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if infLine[1] == networkInterface {
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infFound = true
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buffer.WriteString(fmt.Sprintf("iface %s inet static\n", networkInterface))
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buffer.WriteString(fmt.Sprintf(" address %s\n", address))
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buffer.WriteString(fmt.Sprintf(" netmask %s\n", netmask))
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buffer.WriteString(fmt.Sprintf(" gateway %s\n", gateway))
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continue
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}
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} else {
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if infFound {
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infFound = false
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}
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}
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buffer.WriteString(line + "\n")
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} else if !infFound {
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buffer.WriteString(line + "\n")
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}
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}
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// write config file
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return ioutil.WriteFile(networkConfig, buffer.Bytes(), os.ModePerm)
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}
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@ -0,0 +1,116 @@
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package alpine_builder
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import (
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"io/ioutil"
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"os"
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func init() {
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networkConfig = "test_interfaces"
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}
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func TestGetNetworkInfo(t *testing.T) {
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ass := assert.New(t)
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// file does not exist
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_, err := GetNetworkInfo()
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ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
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// invalid config file
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ass.NoError(ioutil.WriteFile(networkConfig, []byte(""), os.ModePerm))
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_, err = GetNetworkInfo()
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ass.EqualError(err, "invalid network config")
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// dynamic config
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ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet dhcp`), os.ModePerm))
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info, err := GetNetworkInfo()
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ass.NoError(err)
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ass.False(info.IsStatic)
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// static config
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ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet static
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address 1.2.3.4
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netmask 255.255.255.0
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gateway 4.3.2.1`), os.ModePerm))
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info, err = GetNetworkInfo()
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ass.NoError(err)
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ass.True(info.IsStatic)
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ass.Equal("1.2.3.4", info.Address)
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ass.Equal("255.255.255.0", info.Netmask)
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ass.Equal("4.3.2.1", info.Gateway)
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_ = os.Remove(networkConfig)
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}
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func TestNetworkEnableDHCP(t *testing.T) {
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ass := assert.New(t)
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// file does not exist
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_, err := GetNetworkInfo()
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ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
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ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet static
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address 1.2.3.4
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netmask 255.255.255.0
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gateway 4.3.2.1`), os.ModePerm))
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ass.NoError(NetworkEnableDHCP())
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data, err := ioutil.ReadFile(networkConfig)
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ass.NoError(err)
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ass.Equal(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet dhcp
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`, string(data))
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_ = os.Remove(networkConfig)
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}
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func TestNetworkSetStatic(t *testing.T) {
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ass := assert.New(t)
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// file does not exist
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_, err := GetNetworkInfo()
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ass.EqualError(err, "failed to open network config: open test_interfaces: no such file or directory")
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ass.NoError(ioutil.WriteFile(networkConfig, []byte(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet dhcp`), os.ModePerm))
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ass.NoError(NetworkSetStatic("1.2.3.4", "255.255.255.0", "4.3.2.1"))
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data, err := ioutil.ReadFile(networkConfig)
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ass.NoError(err)
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ass.Equal(`auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet static
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address 1.2.3.4
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netmask 255.255.255.0
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gateway 4.3.2.1
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`, string(data))
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_ = os.Remove(networkConfig)
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}
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@ -99,7 +99,7 @@ EOF
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# prepare network
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chroot_exec rc-update add networking default
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ln -fs /data/etc/interfaces ${ROOTFS_PATH}/etc/network/interfaces
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ln -fs /data/etc/network/interfaces ${ROOTFS_PATH}/etc/network/interfaces
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# run local before network -> local brings up the interface
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sed -i '/^\tneed/ s/$/ local/' ${ROOTFS_PATH}/etc/init.d/networking
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@ -200,8 +200,8 @@ root_pw=\$(mkpasswd -m sha-512 -s "${DEFAULT_ROOT_PASSWORD}")
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echo "root:\${root_pw}:0:0:::::" > /data/etc/shadow
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# interface
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if [ ! -f /data/etc/interfaces ]; then
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cat > /data/etc/interfaces <<EOF2
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if [ ! -f /data/etc/network/interfaces ]; then
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cat > /data/etc/network/interfaces <<EOF2
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auto lo
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iface lo inet loopback
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