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 uint32_t localtime_format_YYYYMMDDSS(time_t t, uint32_t seq)
  31 {
  32   struct tm tm;
  33   localtime_r(&t, &tm);
  34   return
  35       (uint32_t)(tm.tm_year+1900) * 1000000u
  36     + (uint32_t)(tm.tm_mon + 1) * 10000u
  37     + (uint32_t)tm.tm_mday * 100u
  38     + seq;
  39 }
  40
  41 uint32_t calculateEditSOA(uint32_t old_serial, const string& kind, const DNSName& zonename)
  42 {
  43   if(pdns_iequals(kind,"INCEPTION-INCREMENT")) {
  44     time_t inception = getStartOfWeek();
  45     uint32_t inception_serial = localtime_format_YYYYMMDDSS(inception, 1);
  46     uint32_t dont_increment_after = localtime_format_YYYYMMDDSS(inception + 2*86400, 99);
  47
  48     if(old_serial < inception_serial - 1) { /* less than <inceptionday>00 */
  49       return inception_serial; /* return <inceptionday>01   (skipping <inceptionday>00 as possible value) */
  50     } else if (old_serial < inception_serial+1) {
  51       /* "<inceptionday>00" and "<inceptionday>01" are reserved for inception increasing, so jump to "<inceptionday>02" */
  52       return inception_serial+1;
  53     } else if(old_serial <= dont_increment_after) { /* >= <inceptionday>00 but <= <inceptionday+2>99 */
  54       return old_serial + 1;
  55     }
  56   }
  57   else if(pdns_iequals(kind,"INCREMENT-WEEKS")) {
  58     time_t inception = getStartOfWeek();
  59     return (old_serial + (inception / (7*86400)));
  60   }
  61   else if(pdns_iequals(kind,"EPOCH")) {
  62     return time(0);
  63   }
  64   else if(pdns_iequals(kind,"INCEPTION-EPOCH")) {
  65     uint32_t inception = getStartOfWeek();
  66     if (old_serial < inception)
  67       return inception;
  68   }
  69   else if(pdns_iequals(kind,"NONE")) {
  70     // do nothing to serial. needed because a metadata of "" will use the default-soa-edit setting instead.
  71   }
  72   else if(!kind.empty()) {
  73     g_log<<Logger::Warning<<"SOA-EDIT type '"<<kind<<"' for zone "<<zonename<<" is unknown."<<endl;
  74   }
  75   // Seen strictly, this is a broken config: we can only come here if
  76   // both SOA-EDIT and default-soa-edit are set to "", but the latter
  77   // should be set to "NONE" instead.
  78   return old_serial;
  79 }
  80
  81 uint32_t calculateEditSOA(uint32_t old_serial, DNSSECKeeper& dk, const DNSName& zonename) {
  82   string kind;
  83   dk.getSoaEdit(zonename, kind);
  84   return calculateEditSOA(old_serial, kind, zonename);
  85 }
  86
  87 /** Used for SOA-EDIT-DNSUPDATE and SOA-EDIT-API. */
  88 static uint32_t calculateIncreaseSOA(uint32_t old_serial, const string& increaseKind, const string& editKind, const DNSName& zonename) {
  89   if (pdns_iequals(increaseKind, "SOA-EDIT-INCREASE")) {
  90     uint32_t new_serial = old_serial;
  91     if (!editKind.empty()) {
  92       new_serial = calculateEditSOA(old_serial, editKind, zonename);
  93     }
  94     if (new_serial <= old_serial) {
  95       new_serial = old_serial + 1;
  96     }
  97     return new_serial;
  98   }
  99   else if (pdns_iequals(increaseKind, "SOA-EDIT")) {
 100     return calculateEditSOA(old_serial, editKind, zonename);
 101   }
 102   else if (pdns_iequals(increaseKind, "INCREASE")) {
 103     return old_serial + 1;
 104   }
 105   else if (pdns_iequals(increaseKind, "EPOCH")) {
 106     return time(0);
 107   }
 108   else if (pdns_iequals(increaseKind, "DEFAULT")) {
 109     time_t now = time(0);
 110     uint32_t new_serial = localtime_format_YYYYMMDDSS(now, 1);
 111     if (new_serial <= old_serial) {
 112         new_serial = old_serial + 1;
 113     }
 114     return new_serial;
 115   } else if(!increaseKind.empty()) {
 116     g_log<<Logger::Warning<<"SOA-EDIT-API/DNSUPDATE type '"<<increaseKind<<"' for zone "<<zonename<<" is unknown."<<endl;
 117   }
 118   return old_serial;
 119 }
 120
 121 /** Used for SOA-EDIT-DNSUPDATE and SOA-EDIT-API.
 122  * Good if you already *have* a DNSResourceRecord.
 123  * Content in rr is suitable for writing into a backend.
 124  *
 125  * @return true if changes may have been made
 126  */
 127 bool increaseSOARecord(DNSResourceRecord& rr, const string& increaseKind, const string& editKind) {
 128   if (increaseKind.empty())
 129     return false;
 130
 131   SOAData sd;
 132   fillSOAData(rr.content, sd);
 133
 134   sd.serial = calculateIncreaseSOA(sd.serial, increaseKind, editKind, rr.qname);
 135   rr.content = makeSOAContent(sd)->getZoneRepresentation(true);
 136   return true;
 137 }
 138
 139 /** Used for SOA-EDIT-DNSUPDATE and SOA-EDIT-API.
 140  * Makes a mostly reset DNSResourceRecord for you in @param rrout.
 141  * Content in rrout is suitable for writing into a backend.
 142  *
 143  * @return true if rrout is now valid
 144  */
 145 bool makeIncreasedSOARecord(SOAData& sd, const string& increaseKind, const string& editKind, DNSResourceRecord& rrout) {
 146   if (increaseKind.empty())
 147     return false;
 148
 149   sd.serial = calculateIncreaseSOA(sd.serial, increaseKind, editKind, sd.qname);
 150   rrout.qname = sd.qname;
 151   rrout.content = makeSOAContent(sd)->getZoneRepresentation(true);
 152   rrout.qtype = QType::SOA;
 153   rrout.domain_id = sd.domain_id;
 154   rrout.auth = 1;
 155   rrout.ttl = sd.ttl;
 156
 157   return true;
 158 }