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Fail gracefully if the page control is not available

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Execute the runPagedQuery without pagination instead of throwing an exception.

fixes #8490
This commit is contained in:
Matthias Jentsch 2015-02-24 12:22:29 +01:00
parent decab543b0
commit b70cda77d4
1 changed files with 48 additions and 10 deletions
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58
library/Icinga/Protocol/Ldap/Connection.php
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@ -4,6 +4,7 @@
namespace Icinga\Protocol\Ldap;
use Exception;
use Icinga\Exception\ProgrammingError;
use Icinga\Protocol\Ldap\Exception as LdapException;
use Icinga\Application\Platform;
use Icinga\Application\Config;
@ -267,13 +268,22 @@ class Connection
$this->connect();
$this->bind();
if ($query->getUsePagedResults() && version_compare(PHP_VERSION, '5.4.0') >= 0) {
if ($this->pageControlAvailable($query)) {
return $this->runPagedQuery($query, $fields);
} else {
return $this->runQuery($query, $fields);
}
}
/**
* Execute the given LDAP query and return the resulting entries
*
* @param Query $query The query to execute
* @param array $fields The fields that will be fetched from the matches
*
* @return array The matched entries
* @throws LdapException
*/
protected function runQuery(Query $query, $fields = array())
{
$limit = $query->getLimit();
@ -322,8 +332,35 @@ class Connection
return $entries;
}
protected function runPagedQuery(Query $query, $fields = array())
/**
* Returns whether requesting the page control is available
*/
protected function pageControlAvailable(Query $query)
{
return $query->getUsePagedResults() && version_compare(PHP_VERSION, '5.4.0') >= 0;
}
/**
* Execute the given LDAP query while requesting pagination control to separate
* big responses into smaller chunks
*
* @param Query $query The query to execute
* @param array $fields The fields that will be fetched from the matches
* @param int $page_size The maximum page size, defaults to Connection::PAGE_SIZE
*
* @return array The matched entries
* @throws LdapException
* @throws ProgrammingError When executed without available page controls (check with pageControlAvailable() )
*/
protected function runPagedQuery(Query $query, $fields = array(), $pageSize = null)
{
if (! $this->pageControlAvailable($query)) {
throw new ProgrammingError('LDAP: Page control not available.');
}
if (! isset($pageSize)) {
$pageSize = static::PAGE_SIZE;
}
$limit = $query->getLimit();
$offset = $query->hasOffset() ? $query->getOffset() - 1 : 0;
$queryString = $query->create();
@ -337,7 +374,10 @@ class Connection
$cookie = '';
$entries = array();
do {
ldap_control_paged_result($this->ds, static::PAGE_SIZE, true, $cookie);
// do not set controlPageResult as a critical extension, since we still want the
// server to return an answer in case the pagination extension is missing.
ldap_control_paged_result($this->ds, $pageSize, false, $cookie);
$results = @ldap_search($this->ds, $base, $queryString, $fields, 0, $limit ? $offset + $limit : 0);
if ($results === false) {
if (ldap_errno($this->ds) === self::LDAP_NO_SUCH_OBJECT) {
@ -375,18 +415,16 @@ class Connection
}
} while (($limit === 0 || $limit !== count($entries)) && ($entry = ldap_next_entry($this->ds, $entry)));
try {
ldap_control_paged_result_response($this->ds, $results, $cookie);
} catch (Exception $e) {
if (false === ldap_control_paged_result_response($this->ds, $results, $cookie)) {
// If the page size is greater than or equal to the sizeLimit value, the server should ignore the
// control as the request can be satisfied in a single page: https://www.ietf.org/rfc/rfc2696.txt
// This applies no matter whether paged search requests are permitted or not. You're done once you
// got everything you were out for.
if (count($entries) !== $limit) {
Logger::warning(
'Unable to request paged LDAP results. Does the server allow paged search requests? (%s)',
$e->getMessage()
);
// The server does not support pagination, but still returned a response by ignoring the
// pagedResultsControl. We output a warning to indicate that the pagination control was ignored.
Logger::warning('Unable to request paged LDAP results. Does the server allow paged search requests?');
}
}