pdns/serialtweaker.cc

   1 /*
   2     PowerDNS Versatile Database Driven Nameserver
   3     Copyright (C) 2002-2011  PowerDNS.COM BV
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License version 2 as
   7     published by the Free Software Foundation
   8
   9     Additionally, the license of this program contains a special
  10     exception which allows to distribute the program in binary form when
  11     it is linked against OpenSSL.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21 */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26 #include "dnsseckeeper.hh"
  27 #include "dnspacket.hh"
  28 #include "namespaces.hh"
  29
  30
  31 uint32_t localtime_format_YYYYMMDDSS(time_t t, uint32_t seq)
  32 {
  33   struct tm tm;
  34   localtime_r(&t, &tm);
  35   return
  36       (uint32_t)(tm.tm_year+1900) * 1000000u
  37     + (uint32_t)(tm.tm_mon + 1) * 10000u
  38     + (uint32_t)tm.tm_mday * 100u
  39     + seq;
  40 }
  41
  42 bool editSOA(DNSSECKeeper& dk, const DNSName& qname, DNSPacket* dp)
  43 {
  44   for(auto& rr :  dp->getRRS()) {
  45     if(rr.dr.d_type == QType::SOA && rr.dr.d_name == qname) {
  46       string kind;
  47       dk.getSoaEdit(qname, kind);
  48       return editSOARecord(rr, kind);
  49     }
  50   }
  51   return false;
  52 }
  53
  54 bool editSOARecord(DNSZoneRecord& rr, const string& kind) {
  55   if(kind.empty())
  56     return false;
  57   auto src = getRR<SOARecordContent>(rr.dr);
  58   src->d_st.serial=calculateEditSOA(rr, kind);
  59
  60   return true;
  61 }
  62
  63 uint32_t calculateEditSOA(const DNSZoneRecord& rr, const string& kind)
  64 {
  65   auto src = getRR<SOARecordContent>(rr.dr);
  66   if(pdns_iequals(kind,"INCEPTION")) {
  67     L<<Logger::Warning<<"Deprecation warning: The 'INCEPTION' soa-edit value will be removed in PowerDNS 4.1"<<endl;
  68     time_t inception = getStartOfWeek();
  69     return localtime_format_YYYYMMDDSS(inception, 1);
  70   }
  71   else if(pdns_iequals(kind,"INCEPTION-INCREMENT")) {
  72     time_t inception = getStartOfWeek();
  73     uint32_t inception_serial = localtime_format_YYYYMMDDSS(inception, 1);
  74     uint32_t dont_increment_after = localtime_format_YYYYMMDDSS(inception + 2*86400, 99);
  75
  76     if(src->d_st.serial < inception_serial - 1) { /* less than <inceptionday>00 */
  77       return inception_serial; /* return <inceptionday>01   (skipping <inceptionday>00 as possible value) */
  78     } else if(src->d_st.serial <= dont_increment_after) { /* >= <inceptionday>00 but <= <inceptionday+2>99 */
  79       return (src->d_st.serial + 2); /* "<inceptionday>00" and "<inceptionday>01" are reserved for inception increasing, so increment sd.serial by two */
  80     }
  81   }
  82   else if(pdns_iequals(kind,"INCEPTION-WEEK")) {
  83     L<<Logger::Warning<<"Deprecation warning: The 'INCEPTION-WEEK' soa-edit value will be removed in PowerDNS 4.1"<<endl;
  84     time_t inception = getStartOfWeek();
  85     return ( inception / (7*86400) );
  86   }
  87   else if(pdns_iequals(kind,"INCREMENT-WEEKS")) {
  88     time_t inception = getStartOfWeek();
  89     return (src->d_st.serial + (inception / (7*86400)));
  90   }
  91   else if(pdns_iequals(kind,"EPOCH")) {
  92     L<<Logger::Warning<<"Deprecation warning: The 'EPOCH' soa-edit value will be removed in PowerDNS 4.1"<<endl;
  93     return time(0);
  94   }
  95   else if(pdns_iequals(kind,"INCEPTION-EPOCH")) {
  96     uint32_t inception = getStartOfWeek();
  97     if (src->d_st.serial < inception)
  98       return inception;
  99   } else if(!kind.empty()) {
 100     L<<Logger::Warning<<"SOA-EDIT type '"<<kind<<"' for zone "<<rr.dr.d_name<<" is unknown."<<endl;
 101   }
 102   return src->d_st.serial;
 103 }
 104
 105 uint32_t calculateEditSOA(const SOAData& sd, const string& kind)
 106 {
 107   DNSZoneRecord dzr;
 108   dzr.dr.d_name=sd.qname;
 109   struct soatimes st;
 110   st.serial = sd.serial;
 111   dzr.dr.d_content = std::make_shared<SOARecordContent>(sd.nameserver, sd.hostmaster, st);
 112   return calculateEditSOA(dzr, kind);
 113 }
 114
 115 // Used for SOA-EDIT-DNSUPDATE and SOA-EDIT-API.
 116 uint32_t calculateIncreaseSOA(DNSZoneRecord& dzr, const string& increaseKind, const string& editKind) {
 117   auto src = getRR<SOARecordContent>(dzr.dr);
 118   // These only work when SOA-EDIT is set, otherwise fall back to default.
 119   if (!editKind.empty()) {
 120     if (pdns_iequals(increaseKind, "SOA-EDIT-INCREASE")) {
 121       uint32_t new_serial = calculateEditSOA(dzr, editKind);
 122       if (new_serial <= src->d_st.serial) {
 123         new_serial = src->d_st.serial + 1;
 124       }
 125       return new_serial;
 126     }
 127     else if (pdns_iequals(increaseKind, "SOA-EDIT")) {
 128       return calculateEditSOA(dzr, editKind);
 129     }
 130   }
 131
 132   if (pdns_iequals(increaseKind, "INCREASE")) {
 133     return src->d_st.serial + 1;
 134   }
 135   else if (pdns_iequals(increaseKind, "EPOCH")) {
 136     return time(0);
 137   }
 138
 139   // DEFAULT case
 140   time_t now = time(0);
 141   struct tm tm;
 142   localtime_r(&now, &tm);
 143   boost::format fmt("%04d%02d%02d%02d");
 144   string newdate = (fmt % (tm.tm_year + 1900) % (tm.tm_mon + 1) % tm.tm_mday % 1).str();
 145   uint32_t new_serial = pdns_stou(newdate);
 146   if (new_serial <= src->d_st.serial) {
 147     new_serial = src->d_st.serial + 1;
 148   }
 149   return new_serial;
 150 }
 151
 152 // Used for SOA-EDIT-DNSUPDATE and SOA-EDIT-API.
 153 uint32_t calculateIncreaseSOA(SOAData sd, const string& increaseKind, const string& editKind) {
 154   DNSZoneRecord dzr;
 155   dzr.dr.d_name=sd.qname;
 156   struct soatimes st;
 157   st.serial = sd.serial;
 158   dzr.dr.d_content = std::make_shared<SOARecordContent>(sd.nameserver, sd.hostmaster, st);
 159   return calculateIncreaseSOA(dzr, increaseKind, editKind);
 160 }
 161
 162
 163
 164 bool increaseSOARecord(DNSResourceRecord& rr, const string& increaseKind, const string& editKind) {
 165   if (increaseKind.empty())
 166     return false;
 167
 168   SOAData sd;
 169   fillSOAData(rr.content, sd);
 170   sd.serial = calculateIncreaseSOA(sd, increaseKind, editKind);
 171   rr.content = serializeSOAData(sd);
 172   return true;
 173 }