2020-05-10 10:27:03 +00:00
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// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydns.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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package svcs
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import (
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"fmt"
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"strings"
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"github.com/miekg/dns"
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"git.happydns.org/happydns/model"
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2020-06-27 17:25:45 +00:00
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"git.happydns.org/happydns/utils"
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2020-05-10 10:27:03 +00:00
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)
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type CNAME struct {
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Target string
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}
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func (s *CNAME) GetNbResources() int {
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return 1
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}
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func (s *CNAME) GenComment(origin string) string {
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return strings.TrimSuffix(s.Target, "."+origin)
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}
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2020-06-27 13:14:14 +00:00
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func (s *CNAME) GenRRs(domain string, ttl uint32, origin string) (rrs []dns.RR) {
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2020-05-10 10:27:03 +00:00
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rrs = append(rrs, &dns.CNAME{
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Hdr: dns.RR_Header{
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2020-09-29 23:30:53 +00:00
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Name: utils.DomainJoin(domain),
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2020-05-10 10:27:03 +00:00
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Rrtype: dns.TypeCNAME,
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Class: dns.ClassINET,
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Ttl: ttl,
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},
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2020-06-27 17:25:45 +00:00
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Target: utils.DomainFQDN(s.Target, origin),
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2020-05-10 10:27:03 +00:00
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})
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return
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}
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type SpecialCNAME struct {
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SubDomain string
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Target string
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}
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func (s *SpecialCNAME) GetNbResources() int {
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return 1
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}
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func (s *SpecialCNAME) GenComment(origin string) string {
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return "(" + s.SubDomain + ") -> " + strings.TrimSuffix(s.Target, "."+origin)
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}
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2020-06-27 13:14:14 +00:00
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func (s *SpecialCNAME) GenRRs(domain string, ttl uint32, origin string) (rrs []dns.RR) {
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2020-05-10 10:27:03 +00:00
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rrs = append(rrs, &dns.CNAME{
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Hdr: dns.RR_Header{
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2020-09-29 23:30:53 +00:00
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Name: utils.DomainJoin(s.SubDomain, domain),
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2020-05-10 10:27:03 +00:00
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Rrtype: dns.TypeCNAME,
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Class: dns.ClassINET,
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Ttl: ttl,
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},
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2020-06-27 17:25:45 +00:00
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Target: utils.DomainFQDN(s.Target, origin),
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2020-05-10 10:27:03 +00:00
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})
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return
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}
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func specialalias_analyze(a *Analyzer) error {
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// Try handle specials domains using CNAME
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2020-10-06 14:45:41 +00:00
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for _, record := range a.SearchRR(AnalyzerRecordFilter{Type: dns.TypeCNAME, Prefix: "_"}) {
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2020-05-10 10:27:03 +00:00
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subdomains := SRV_DOMAIN.FindStringSubmatch(record.Header().Name)
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if cname, ok := record.(*dns.CNAME); len(subdomains) == 4 && ok {
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2020-10-06 14:45:41 +00:00
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a.UseRR(record, subdomains[3], &SpecialCNAME{
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2020-05-10 10:27:03 +00:00
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SubDomain: fmt.Sprintf("_%s._%s", subdomains[1], subdomains[2]),
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Target: cname.Target,
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})
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}
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}
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return nil
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}
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func alias_analyze(a *Analyzer) error {
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2020-10-06 14:45:41 +00:00
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for _, record := range a.SearchRR(AnalyzerRecordFilter{Type: dns.TypeCNAME}) {
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2020-05-10 10:27:03 +00:00
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if cname, ok := record.(*dns.CNAME); ok {
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2020-06-22 18:46:18 +00:00
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newrr := &CNAME{
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Target: strings.TrimSuffix(cname.Target, "."+a.origin),
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2020-05-10 10:27:03 +00:00
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}
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2020-10-06 14:45:41 +00:00
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a.UseRR(record, cname.Header().Name, newrr)
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2020-05-10 10:27:03 +00:00
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}
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}
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return nil
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}
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func init() {
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RegisterService(
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func() happydns.Service {
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2020-05-13 16:58:07 +00:00
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return &SpecialCNAME{}
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2020-05-10 10:27:03 +00:00
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},
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specialalias_analyze,
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ServiceInfos{
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Name: "SubAlias",
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2020-07-05 19:39:17 +00:00
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Description: "A service alias to another domain/service.",
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2020-05-10 10:27:03 +00:00
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Categories: []string{
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"internal",
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},
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2020-07-06 09:07:37 +00:00
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Restrictions: ServiceRestrictions{
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NearAlone: true,
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2020-07-26 18:54:53 +00:00
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NeedTypes: []uint16{
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dns.TypeCNAME,
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},
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2020-07-06 09:07:37 +00:00
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},
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2020-05-10 10:27:03 +00:00
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},
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99999997,
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)
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RegisterService(
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func() happydns.Service {
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return &CNAME{}
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},
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alias_analyze,
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ServiceInfos{
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Name: "Alias",
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2020-07-05 19:39:17 +00:00
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Description: "An alias to another domain.",
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2020-05-10 10:27:03 +00:00
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Categories: []string{
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"internal",
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},
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2020-07-06 09:07:37 +00:00
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Restrictions: ServiceRestrictions{
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Alone: true,
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Single: true,
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2020-07-26 18:54:53 +00:00
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NeedTypes: []uint16{
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dns.TypeCNAME,
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},
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2020-07-06 09:07:37 +00:00
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},
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2020-05-10 10:27:03 +00:00
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},
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99999998,
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)
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}
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