67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
package etchosts
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"regexp"
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)
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type Record struct {
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Hosts string
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IP string
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}
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func (r Record) WriteTo(w io.Writer) (int64, error) {
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n, err := fmt.Fprintf(w, "%s\t%s\n", r.IP, r.Hosts)
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return int64(n), err
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}
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var defaultContent = []Record{
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{Hosts: "localhost", IP: "127.0.0.1"},
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{Hosts: "localhost ip6-localhost ip6-loopback", IP: "::1"},
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{Hosts: "ip6-localnet", IP: "fe00::0"},
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{Hosts: "ip6-mcastprefix", IP: "ff00::0"},
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{Hosts: "ip6-allnodes", IP: "ff02::1"},
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{Hosts: "ip6-allrouters", IP: "ff02::2"},
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}
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func Build(path, IP, hostname, domainname string, extraContent []Record) error {
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content := bytes.NewBuffer(nil)
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if IP != "" {
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var mainRec Record
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mainRec.IP = IP
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if domainname != "" {
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mainRec.Hosts = fmt.Sprintf("%s.%s %s", hostname, domainname, hostname)
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} else {
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mainRec.Hosts = hostname
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}
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if _, err := mainRec.WriteTo(content); err != nil {
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return err
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}
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}
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for _, r := range defaultContent {
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if _, err := r.WriteTo(content); err != nil {
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return err
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}
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}
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for _, r := range extraContent {
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if _, err := r.WriteTo(content); err != nil {
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return err
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}
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}
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return ioutil.WriteFile(path, content.Bytes(), 0644)
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}
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func Update(path, IP, hostname string) error {
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old, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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var re = regexp.MustCompile(fmt.Sprintf("(\\S*)(\\t%s)", regexp.QuoteMeta(hostname)))
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return ioutil.WriteFile(path, re.ReplaceAll(old, []byte(IP+"$2")), 0644)
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}
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