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Initial commit

master
Gregory Rudolph 2 years ago
parent
commit
e42cccdcdc
Signed by: rudi
GPG Key ID: EF64F3CBD1A1EBDD
  1. 8
      go.mod
  2. 4
      go.sum
  3. 143
      main.go

8
go.mod

@ -0,0 +1,8 @@ @@ -0,0 +1,8 @@
module git.hugfreevikings.wtf/UniventionDNS2Go
go 1.18
require (
gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d // indirect
gopkg.in/ldap.v2 v2.5.1 // indirect
)

4
go.sum

@ -0,0 +1,4 @@ @@ -0,0 +1,4 @@
gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d h1:TxyelI5cVkbREznMhfzycHdkp5cLA7DpE+GKjSslYhM=
gopkg.in/asn1-ber.v1 v1.0.0-20181015200546-f715ec2f112d/go.mod h1:cuepJuh7vyXfUyUwEgHQXw849cJrilpS5NeIjOWESAw=
gopkg.in/ldap.v2 v2.5.1 h1:wiu0okdNfjlBzg6UWvd1Hn8Y+Ux17/u/4nlk4CQr6tU=
gopkg.in/ldap.v2 v2.5.1/go.mod h1:oI0cpe/D7HRtBQl8aTg+ZmzFUAvu4lsv3eLXMLGFxWk=

143
main.go

@ -0,0 +1,143 @@ @@ -0,0 +1,143 @@
package main
import (
"bufio"
"crypto/tls"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"gopkg.in/ldap.v2"
)
var (
configFile string
domain string
host string
ldap_uri string
ldap_default_bind_dn string
ldap_default_authtok string
ldap_search_base string
)
type IP struct {
Query string
}
func init() {
flag.StringVar(&configFile, "c", "/etc/sssd/sssd.conf", "Path to SSSD Config.")
flag.StringVar(&host, "h", host, "Host ID for DNS (relativeDomainName)")
flag.StringVar(&domain, "d", "", "Domain for DNS (zoneName)")
flag.Parse()
}
func main() {
log.Printf("Using %+v as config file path", configFile)
file, err := os.Open(configFile)
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
// optionally, resize scanner's capacity for lines over 64K, see next example
for scanner.Scan() {
line := scanner.Text()
mod := &ldap_uri
switch {
case strings.Contains(line, "ldap_uri"):
mod = &ldap_uri
case strings.Contains(line, "ldap_default_bind_dn"):
mod = &ldap_default_bind_dn
case strings.Contains(line, "ldap_default_authtok"):
mod = &ldap_default_authtok
case strings.Contains(line, "ldap_search_base"):
mod = &ldap_search_base
default:
continue
}
*mod = strings.Split(line, "= ")[1]
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
log.Printf("Connecting to %s", ldap_uri)
ldap_uri = strings.ReplaceAll(ldap_uri, "ldap://", "")
l, err := ldap.Dial("tcp", ldap_uri)
if err != nil {
log.Fatal(err)
}
defer l.Close()
log.Printf("Connected to %s, reconnecting with TLS", ldap_uri)
// Reconnect with TLS
err = l.StartTLS(&tls.Config{InsecureSkipVerify: true})
if err != nil {
log.Fatal(err)
}
log.Printf("Binding as %s", ldap_default_bind_dn)
// First bind with a read only user
err = l.Bind(ldap_default_bind_dn, ldap_default_authtok)
if err != nil {
log.Fatal(err)
}
log.Printf("Connected as read-only user, searching for DNS Record")
// Search for the given username
searchRequest := ldap.NewSearchRequest(
fmt.Sprintf("zoneName=%s,cn=dns,%s", ldap.EscapeFilter(domain), ldap.EscapeFilter(ldap_search_base)),
ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
fmt.Sprintf("(relativeDomainName=%s)", ldap.EscapeFilter(host)),
[]string{"dn"},
nil,
)
sr, err := l.Search(searchRequest)
if err != nil {
log.Fatal(err)
}
if len(sr.Entries) != 1 {
log.Fatalf("Host does not exist or too many entries returned (%+v)", len(sr.Entries))
}
log.Printf("Record found for %s.%s", host, domain)
newIp := getip2()
if sr.Entries[0].GetAttributeValue("aRecord") == newIp {
log.Println("New IP is same as old IP, exiting gracefully.")
return
}
req := ldap.NewModifyRequest(sr.Entries[0].DN)
req.Replace("aRecord", []string{newIp})
if err = l.Modify(req); err != nil {
log.Fatalf("Failed to modify DN: %s\n", err)
}
log.Printf("Updated record successfully.")
}
func getip2() string {
req, err := http.Get("http://ip-api.com/json/")
if err != nil {
return err.Error()
}
defer req.Body.Close()
body, err := ioutil.ReadAll(req.Body)
if err != nil {
return err.Error()
}
var ip IP
json.Unmarshal(body, &ip)
log.Printf("Detected IP as %s", ip.Query)
return ip.Query
}
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