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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* DNS Library for handling lookups and updates.
*
* PHP Version 5
*
* Copyright (c) 2010, Mike Pultz <mike@mikepultz.com>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Mike Pultz nor the names of his contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRIC
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @copyright 2010 Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version SVN: $Id$
* @link http://pear.php.net/package/Net_DNS2
* @since File available since Release 0.6.0
*
*/
/**
* The main dynamic DNS updater class.
*
* This class provices functions to handle all defined dynamic DNS update
* requests as defined by RFC 2136.
*
* This is separate from the Net_DNS2_Resolver class, as while the underlying
* protocol is the same, the functionality is completely different.
*
* Generally, query (recursive) lookups are done against caching server, while
* update requests are done against authoratative servers.
*
* @category Networking
* @package Net_DNS2
* @author Mike Pultz <mike@mikepultz.com>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @link http://pear.php.net/package/Net_DNS2
* @see Net_DNS2
*
*/
class Net_DNS2_Updater extends Net_DNS2
{
/*
* a Net_DNS2_Packet_Request object used for the update request
*/
private $_packet;
/**
* Constructor - builds a new Net_DNS2_Updater objected used for doing
* dynamic DNS updates
*
* @param string $zone the domain name to use for DNS updates
* @param mixed $options an array of config options or null
*
* @throws Net_DNS2_Exception
* @access public
*
*/
public function __construct($zone, array $options = null)
{
parent::__construct($options);
//
// create the packet
//
$this->_packet = new Net_DNS2_Packet_Request(
strtolower(trim($zone, " \n\r\t.")), 'SOA', 'IN'
);
//
// make sure the opcode on the packet is set to UPDATE
//
$this->_packet->header->opcode = Net_DNS2_Lookups::OPCODE_UPDATE;
}
/**
* checks that the given name matches the name for the zone we're updating
*
* @param string $name The name to be checked.
*
* @return boolean
* @throws Net_DNS2_Exception
* @access private
*
*/
private function _checkName($name)
{
if (!preg_match('/' . $this->_packet->question[0]->qname . '$/', $name)) {
throw new Net_DNS2_Exception(
'name provided (' . $name . ') does not match zone name (' .
$this->_packet->question[0]->qname . ')',
Net_DNS2_Lookups::E_PACKET_INVALID
);
}
return true;
}
/**
* add a signature to the request for authentication
*
* @param string $keyname the key name to use for the TSIG RR
* @param string $signature the key to sign the request.
*
* @return boolean
* @access public
* @see Net_DNS2::signTSIG()
* @deprecated function deprecated in 1.1.0
*
*/
public function signature($keyname, $signature)
{
return $this->signTSIG($keyname, $signature);
}
/**
* 2.5.1 - Add To An RRset
*
* RRs are added to the Update Section whose NAME, TYPE, TTL, RDLENGTH
* and RDATA are those being added, and CLASS is the same as the zone
* class. Any duplicate RRs will be silently ignored by the primary
* master.
*
* @param Net_DNS2_RR $rr the Net_DNS2_RR object to be added to the zone
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function add(Net_DNS2_RR $rr)
{
$this->_checkName($rr->name);
//
// add the RR to the "update" section
//
if (!in_array($rr, $this->_packet->authority)) {
$this->_packet->authority[] = $rr;
}
return true;
}
/**
* 2.5.4 - Delete An RR From An RRset
*
* RRs to be deleted are added to the Update Section. The NAME, TYPE,
* RDLENGTH and RDATA must match the RR being deleted. TTL must be
* specified as zero (0) and will otherwise be ignored by the primary
* master. CLASS must be specified as NONE to distinguish this from an
* RR addition. If no such RRs exist, then this Update RR will be
* silently ignored by the primary master.
*
* @param Net_DNS2_RR $rr the Net_DNS2_RR object to be deleted from the zone
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function delete(Net_DNS2_RR $rr)
{
$this->_checkName($rr->name);
$rr->ttl = 0;
$rr->class = 'NONE';
//
// add the RR to the "update" section
//
if (!in_array($rr, $this->_packet->authority)) {
$this->_packet->authority[] = $rr;
}
return true;
}
/**
* 2.5.2 - Delete An RRset
*
* One RR is added to the Update Section whose NAME and TYPE are those
* of the RRset to be deleted. TTL must be specified as zero (0) and is
* otherwise not used by the primary master. CLASS must be specified as
* ANY. RDLENGTH must be zero (0) and RDATA must therefore be empty.
* If no such RRset exists, then this Update RR will be silently ignored
* by the primary master
*
* @param string $name the RR name to be removed from the zone
* @param string $type the RR type to be removed from the zone
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function deleteAny($name, $type)
{
$this->_checkName($name);
$class = Net_DNS2_Lookups::$rr_types_id_to_class[
Net_DNS2_Lookups::$rr_types_by_name[$type]
];
if (!isset($class)) {
throw new Net_DNS2_Exception(
'unknown or un-supported resource record type: ' . $type,
Net_DNS2_Lookups::E_RR_INVALID
);
}
$rr = new $class;
$rr->name = $name;
$rr->ttl = 0;
$rr->class = 'ANY';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "update" section
//
if (!in_array($rr, $this->_packet->authority)) {
$this->_packet->authority[] = $rr;
}
return true;
}
/**
* 2.5.3 - Delete All RRsets From A Name
*
* One RR is added to the Update Section whose NAME is that of the name
* to be cleansed of RRsets. TYPE must be specified as ANY. TTL must
* be specified as zero (0) and is otherwise not used by the primary
* master. CLASS must be specified as ANY. RDLENGTH must be zero (0)
* and RDATA must therefore be empty. If no such RRsets exist, then
* this Update RR will be silently ignored by the primary master.
*
* @param string $name the RR name to be removed from the zone
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function deleteAll($name)
{
$this->_checkName($name);
//
// the Net_DNS2_RR_ANY class is just an empty stub class used for these
// cases only
//
$rr = new Net_DNS2_RR_ANY;
$rr->name = $name;
$rr->ttl = 0;
$rr->type = 'ANY';
$rr->class = 'ANY';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "update" section
//
if (!in_array($rr, $this->_packet->authority)) {
$this->_packet->authority[] = $rr;
}
return true;
}
/**
* 2.4.1 - RRset Exists (Value Independent)
*
* At least one RR with a specified NAME and TYPE (in the zone and class
* specified in the Zone Section) must exist.
*
* For this prerequisite, a requestor adds to the section a single RR
* whose NAME and TYPE are equal to that of the zone RRset whose
* existence is required. RDLENGTH is zero and RDATA is therefore
* empty. CLASS must be specified as ANY to differentiate this
* condition from that of an actual RR whose RDLENGTH is naturally zero
* (0) (e.g., NULL). TTL is specified as zero (0).
*
* @param string $name the RR name for the prerequisite
* @param string $type the RR type for the prerequisite
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function checkExists($name, $type)
{
$this->_checkName($name);
$class = Net_DNS2_Lookups::$rr_types_id_to_class[
Net_DNS2_Lookups::$rr_types_by_name[$type]
];
if (!isset($class)) {
throw new Net_DNS2_Exception(
'unknown or un-supported resource record type: ' . $type,
Net_DNS2_Lookups::E_RR_INVALID
);
}
$rr = new $class;
$rr->name = $name;
$rr->ttl = 0;
$rr->class = 'ANY';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "prerequisite" section
//
if (!in_array($rr, $this->_packet->answer)) {
$this->_packet->answer[] = $rr;
}
return true;
}
/**
* 2.4.2 - RRset Exists (Value Dependent)
*
* A set of RRs with a specified NAME and TYPE exists and has the same
* members with the same RDATAs as the RRset specified here in this
* section. While RRset ordering is undefined and therefore not
* significant to this comparison, the sets be identical in their
* extent.
*
* For this prerequisite, a requestor adds to the section an entire
* RRset whose preexistence is required. NAME and TYPE are that of the
* RRset being denoted. CLASS is that of the zone. TTL must be
* specified as zero (0) and is ignored when comparing RRsets for
* identity.
*
* @param Net_DNS2_RR $rr the RR object to be used as a prerequisite
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function checkValueExists(Net_DNS2_RR $rr)
{
$this->_checkName($rr->name);
$rr->ttl = 0;
//
// add the RR to the "prerequisite" section
//
if (!in_array($rr, $this->_packet->answer)) {
$this->_packet->answer[] = $rr;
}
return true;
}
/**
* 2.4.3 - RRset Does Not Exist
*
* No RRs with a specified NAME and TYPE (in the zone and class denoted
* by the Zone Section) can exist.
*
* For this prerequisite, a requestor adds to the section a single RR
* whose NAME and TYPE are equal to that of the RRset whose nonexistence
* is required. The RDLENGTH of this record is zero (0), and RDATA
* field is therefore empty. CLASS must be specified as NONE in order
* to distinguish this condition from a valid RR whose RDLENGTH is
* naturally zero (0) (for example, the NULL RR). TTL must be specified
* as zero (0).
*
* @param string $name the RR name for the prerequisite
* @param string $type the RR type for the prerequisite
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function checkNotExists($name, $type)
{
$this->_checkName($name);
$class = Net_DNS2_Lookups::$rr_types_id_to_class[
Net_DNS2_Lookups::$rr_types_by_name[$type]
];
if (!isset($class)) {
throw new Net_DNS2_Exception(
'unknown or un-supported resource record type: ' . $type,
Net_DNS2_Lookups::E_RR_INVALID
);
}
$rr = new $class;
$rr->name = $name;
$rr->ttl = 0;
$rr->class = 'NONE';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "prerequisite" section
//
if (!in_array($rr, $this->_packet->answer)) {
$this->_packet->answer[] = $rr;
}
return true;
}
/**
* 2.4.4 - Name Is In Use
*
* Name is in use. At least one RR with a specified NAME (in the zone
* and class specified by the Zone Section) must exist. Note that this
* prerequisite is NOT satisfied by empty nonterminals.
*
* For this prerequisite, a requestor adds to the section a single RR
* whose NAME is equal to that of the name whose ownership of an RR is
* required. RDLENGTH is zero and RDATA is therefore empty. CLASS must
* be specified as ANY to differentiate this condition from that of an
* actual RR whose RDLENGTH is naturally zero (0) (e.g., NULL). TYPE
* must be specified as ANY to differentiate this case from that of an
* RRset existence test. TTL is specified as zero (0).
*
* @param string $name the RR name for the prerequisite
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function checkNameInUse($name)
{
$this->_checkName($name);
//
// the Net_DNS2_RR_ANY class is just an empty stub class used for these
// cases only
//
$rr = new Net_DNS2_RR_ANY;
$rr->name = $name;
$rr->ttl = 0;
$rr->type = 'ANY';
$rr->class = 'ANY';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "prerequisite" section
//
if (!in_array($rr, $this->_packet->answer)) {
$this->_packet->answer[] = $rr;
}
return true;
}
/**
* 2.4.5 - Name Is Not In Use
*
* Name is not in use. No RR of any type is owned by a specified NAME.
* Note that this prerequisite IS satisfied by empty nonterminals.
*
* For this prerequisite, a requestor adds to the section a single RR
* whose NAME is equal to that of the name whose nonownership of any RRs
* is required. RDLENGTH is zero and RDATA is therefore empty. CLASS
* must be specified as NONE. TYPE must be specified as ANY. TTL must
* be specified as zero (0).
*
* @param string $name the RR name for the prerequisite
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function checkNameNotInUse($name)
{
$this->_checkName($name);
//
// the Net_DNS2_RR_ANY class is just an empty stub class used for these
// cases only
//
$rr = new Net_DNS2_RR_ANY;
$rr->name = $name;
$rr->ttl = 0;
$rr->type = 'ANY';
$rr->class = 'NONE';
$rr->rdlength = -1;
$rr->rdata = '';
//
// add the RR to the "prerequisite" section
//
if (!in_array($rr, $this->_packet->answer)) {
$this->_packet->answer[] = $rr;
}
return true;
}
/**
* returns the current internal packet object.
*
* @return Net_DNS2_Packet_Request
* @access public
#
*/
public function packet()
{
//
// take a copy
//
$p = $this->_packet;
//
// check for an authentication method; either TSIG or SIG
//
if ( ($this->auth_signature instanceof Net_DNS2_RR_TSIG)
|| ($this->auth_signature instanceof Net_DNS2_RR_SIG)
) {
$p->additional[] = $this->auth_signature;
}
//
// update the counts
//
$p->header->qdcount = count($p->question);
$p->header->ancount = count($p->answer);
$p->header->nscount = count($p->authority);
$p->header->arcount = count($p->additional);
return $p;
}
/**
* executes the update request with the object informaton
*
* @param Net_DNS2_Packet_Response &$response ref to the response object
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function update(&$response = null)
{
//
// make sure we have some name servers set
//
$this->checkServers(Net_DNS2::RESOLV_CONF);
//
// check for an authentication method; either TSIG or SIG
//
if ( ($this->auth_signature instanceof Net_DNS2_RR_TSIG)
|| ($this->auth_signature instanceof Net_DNS2_RR_SIG)
) {
$this->_packet->additional[] = $this->auth_signature;
}
//
// update the counts
//
$this->_packet->header->qdcount = count($this->_packet->question);
$this->_packet->header->ancount = count($this->_packet->answer);
$this->_packet->header->nscount = count($this->_packet->authority);
$this->_packet->header->arcount = count($this->_packet->additional);
//
// make sure we have some data to send
//
if ( ($this->_packet->header->qdcount == 0)
|| ($this->_packet->header->nscount == 0)
) {
throw new Net_DNS2_Exception(
'empty headers- nothing to send!',
Net_DNS2_Lookups::E_PACKET_INVALID
);
}
//
// send the packet and get back the response
//
$response = $this->sendPacket($this->_packet, $this->use_tcp);
//
// clear the internal packet so if we make another request, we don't have
// old data being sent.
//
$this->_packet->reset();
//
// for updates, we just need to know it worked- we don't actualy need to
// return the response object
//
return true;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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