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gen.go
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gen.go
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package cmd
import (
"bufio"
"fmt"
"log"
"os"
"github.com/StackExchange/dnscontrol/v4/pkg/printer"
"github.com/StackExchange/dnscontrol/v4/pkg/zonerecs"
"github.com/hm-edu/dnscontrol-extended/helper"
"net"
"regexp"
"strings"
"github.com/StackExchange/dnscontrol/v4/models"
"github.com/StackExchange/dnscontrol/v4/pkg/transform"
"github.com/StackExchange/dnscontrol/v4/providers"
_ "github.com/StackExchange/dnscontrol/v4/providers/bind"
"github.com/miekg/dns"
"github.com/spf13/cobra"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
func genLogger() *zap.Logger {
config := zap.NewProductionEncoderConfig()
config.EncodeTime = zapcore.ISO8601TimeEncoder
config.EncodeLevel = zapcore.CapitalColorLevelEncoder
consoleEncoder := zapcore.NewConsoleEncoder(config)
defaultLogLevel := zapcore.DebugLevel
core := zapcore.NewTee(
zapcore.NewCore(consoleEncoder, zapcore.AddSync(os.Stdout), defaultLogLevel),
)
logger := zap.New(core, zap.AddStacktrace(zapcore.FatalLevel))
return logger
}
var genCmd = &cobra.Command{
Use: "gen",
Short: "Queries the forward zones and generates a new reverse zone",
Run: func(cmd *cobra.Command, args []string) {
logger := genLogger()
patternTxt, _ := regexp.Compile("hm-reverse-lookup-ip=(.*)")
patternName, _ := regexp.Compile("_hmip_(.*)")
writer := &helper.Writer{Log: logger}
printer.DefaultPrinter = &printer.ConsolePrinter{
Reader: bufio.NewReader(os.Stdin),
Writer: writer,
Verbose: false,
}
defer writer.Close()
domains, _ := cmd.Flags().GetStringSlice("domains")
zones, _ := cmd.Flags().GetStringSlice("zones")
ns, _ := cmd.Flags().GetStringSlice("nameservers")
mbox, _ := cmd.Flags().GetString("mbox")
dir, _ := cmd.Flags().GetString("path")
soa, _ := dns.NewRR(fmt.Sprintf("@ IN SOA %s %s 0 0 0 0 0", ns[0], mbox))
var cfg = map[string]string{}
cfg["directory"] = dir
cfg["filenameformat"] = "zone.%U"
provider, err := providers.CreateDNSProvider("BIND", cfg, nil)
if err != nil {
logger.Sugar().Fatalf("error creating bind provider %v", err)
}
var records []dns.RR
for _, domain := range domains {
logger.Sugar().Infof("getting records in domain %s", domain)
entries, err := getRecords(domain)
if err != nil {
logger.Sugar().Fatalf("error querying domain %s %v", domain, err)
}
records = append(records, entries...)
}
for _, zone := range zones {
_, cidr, err := net.ParseCIDR(zone)
if err != nil {
logger.Sugar().Fatalf("error generating reverse zone for %s %v", zone, err)
}
name, err := transform.ReverseDomainName(zone)
if err != nil {
logger.Sugar().Fatalf("error generating reverse zone for %s %v", zone, err)
}
entries := make(map[string]string)
ptrRecords := models.Records{}
rec, err := models.RRtoRC(soa, name)
if err != nil {
logger.Sugar().Fatalf("error generating reverse zone for %s %v", zone, err)
}
ptrRecords = append(ptrRecords, &rec)
for _, server := range ns {
dnsRR, _ := dns.NewRR(fmt.Sprintf("%s IN NS %s", name, server))
rec, err := models.RRtoRC(dnsRR, name)
if err != nil {
logger.Sugar().Fatalf("error generating reverse zone for %s %v", zone, err)
}
ptrRecords = append(ptrRecords, &rec)
}
for _, record := range records {
if a, ok := record.(*dns.A); ok {
if !cidr.Contains(a.A) {
continue
}
revName, err := transform.ReverseDomainName(a.A.String())
if err != nil {
logger.Sugar().Fatalf("error adding ptr %v", err)
}
if record, found := entries[revName]; found {
logger.Sugar().Warnf("replacing existing record %s with %s", record, a.Hdr.Name)
}
entries[revName] = a.Hdr.Name
}
}
for _, record := range records {
if txt, ok := record.(*dns.TXT); ok {
if okRevIp := patternTxt.MatchString(txt.String()); okRevIp {
if okHmIp := patternName.MatchString(txt.Hdr.Name); okHmIp {
matches := patternTxt.FindStringSubmatch(txt.String())
ip := matches[1]
ip = strings.TrimSpace(strings.Trim(ip, "\""))
if !cidr.Contains(net.ParseIP(ip)) {
continue
}
revName, err := transform.ReverseDomainName(ip)
if err != nil {
log.Fatalf("error adding ptr %v", err)
}
name := patternName.FindStringSubmatch(txt.Hdr.Name)[1]
if record, found := entries[revName]; found {
if record != name {
logger.Sugar().Infof("replacing existing record for %s using txt record: %s %s", ip, record, name)
}
} else {
logger.Sugar().Warnf("adding reverse entry without forward entry for %s -> %s", ip, name)
}
entries[revName] = name
}
}
}
}
for key, value := range entries {
rr, err := dns.NewRR(fmt.Sprintf("%s IN PTR %s", key, strings.ToLower(value)))
if err != nil {
log.Fatalf("error adding ptr %v", err)
}
rec, err := models.RRtoRC(rr, name)
if err != nil {
log.Fatalf("error adding ptr %v", err)
}
ptrRecords = append(ptrRecords, &rec)
}
var nameservers []*models.Nameserver
for _, server := range ns {
nameservers = append(nameservers, &models.Nameserver{Name: server})
}
config := models.DomainConfig{
Name: name,
Records: ptrRecords,
Nameservers: nameservers,
Metadata: make(map[string]string),
}
config.Metadata[models.DomainUniqueName] = name
_, corrections, err := zonerecs.CorrectZoneRecords(provider, &config)
if err != nil {
logger.Sugar().Fatalf("error computing domain corrections %v", err)
}
if len(corrections) == 0 {
logger.Sugar().Infof("no changes required for zone %s", name)
} else {
for _, correction := range corrections {
msgs := strings.Split(correction.Msg, "\n")
logger.Sugar().Infof("Applying changes to zone %s", zone)
for _, msg := range msgs {
logger.Sugar().Infof("%s", msg)
}
err := correction.F()
if err != nil {
logger.Sugar().Fatalf("error applying corrections %v", err)
}
}
}
}
}}
func getRecords(zone string) ([]dns.RR, error) {
var con net.Conn = nil
var err error = nil
server := "127.0.0.1:53"
con, err = net.Dial("tcp", server)
if err != nil {
return nil, err
}
dnsConnection := &dns.Conn{Conn: con}
transfer := &dns.Transfer{Conn: dnsConnection}
request := new(dns.Msg)
request.SetAxfr(zone + ".")
envelope, err := transfer.In(request, server)
if err != nil {
return nil, err
}
var rawRecords []dns.RR
for msg := range envelope {
if msg.Error != nil {
// Fragile but more "user-friendly" error-handling
err := msg.Error.Error()
if err == "dns: bad xfr rcode: 9" {
err = "NOT AUTH (9)"
}
return nil, fmt.Errorf("[Error] AXFRDDNS: nameserver refused to transfer the zone: %s", err)
}
rawRecords = append(rawRecords, msg.RR...)
}
return rawRecords, nil
}
func init() {
rootCmd.AddCommand(genCmd)
genCmd.Flags().StringSliceP("domains", "d", []string{}, "the domains to query for computation of reverse zone")
genCmd.Flags().StringSliceP("zones", "z", []string{}, "the ip ranges reverse zones shall be generated for")
genCmd.Flags().StringSliceP("nameservers", "n", []string{}, "the nameservers to use in the generated zone file")
genCmd.Flags().String("mbox", "", "the desired soa mbox")
genCmd.Flags().String("path", "/etc/bind/zones/reverse", "the path for storing the reverse zones")
genCmd.MarkFlagRequired("domains")
genCmd.MarkFlagRequired("zones")
genCmd.MarkFlagRequired("nameservers")
genCmd.MarkFlagRequired("mbox")
}