3 * Various HTTP related functions.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
29 * Various HTTP related functions
33 static $httpEngine = false;
36 * Perform an HTTP request
38 * @param $method String: HTTP method. Usually GET/POST
39 * @param $url String: full URL to act on. If protocol-relative, will be expanded to an http:// URL
40 * @param $options Array: options to pass to MWHttpRequest object.
41 * Possible keys for the array:
42 * - timeout Timeout length in seconds
43 * - postData An array of key-value pairs or a url-encoded form data
44 * - proxy The proxy to use.
45 * Otherwise it will use $wgHTTPProxy (if set)
46 * Otherwise it will use the environment variable "http_proxy" (if set)
47 * - noProxy Don't use any proxy at all. Takes precedence over proxy value(s).
48 * - sslVerifyHost (curl only) Set to 2 to verify hostname against certificate
49 * Setting to 1 (or true) will NOT verify the host name. It will
50 * only check its existence. Setting to 0 (or false) disables entirely.
51 * - sslVerifyCert (curl only) Verify SSL certificate
52 * - caInfo (curl only) Provide CA information
53 * - maxRedirects Maximum number of redirects to follow (defaults to 5)
54 * - followRedirects Whether to follow redirects (defaults to false).
55 * Note: this should only be used when the target URL is trusted,
56 * to avoid attacks on intranet services accessible by HTTP.
57 * - userAgent A user agent, if you want to override the default
58 * MediaWiki/$wgVersion
59 * @return Mixed: (bool)false on failure or a string on success
61 public static function request( $method, $url, $options = array() ) {
62 wfDebug( "HTTP: $method: $url\n" );
63 $options['method'] = strtoupper( $method );
65 if ( !isset( $options['timeout'] ) ) {
66 $options['timeout'] = 'default';
69 $req = MWHttpRequest
::factory( $url, $options );
70 $status = $req->execute();
72 if ( $status->isOK() ) {
73 return $req->getContent();
80 * Simple wrapper for Http::request( 'GET' )
81 * @see Http::request()
84 * @param $timeout string
85 * @param $options array
88 public static function get( $url, $timeout = 'default', $options = array() ) {
89 $options['timeout'] = $timeout;
90 return Http
::request( 'GET', $url, $options );
94 * Simple wrapper for Http::request( 'POST' )
95 * @see Http::request()
98 * @param $options array
101 public static function post( $url, $options = array() ) {
102 return Http
::request( 'POST', $url, $options );
106 * Check if the URL can be served by localhost
108 * @param $url String: full url to check
111 public static function isLocalURL( $url ) {
112 global $wgCommandLineMode, $wgConf;
114 if ( $wgCommandLineMode ) {
120 if ( preg_match( '!^http://([\w.-]+)[/:].*$!', $url, $matches ) ) {
123 $domainParts = explode( '.', $host );
124 // Check if this domain or any superdomain is listed in $wgConf as a local virtual host
125 $domainParts = array_reverse( $domainParts );
128 for ( $i = 0; $i < count( $domainParts ); $i++
) {
129 $domainPart = $domainParts[$i];
131 $domain = $domainPart;
133 $domain = $domainPart . '.' . $domain;
136 if ( $wgConf->isLocalVHost( $domain ) ) {
146 * A standard user-agent we can use for external requests.
149 public static function userAgent() {
151 return "MediaWiki/$wgVersion";
155 * Checks that the given URI is a valid one. Hardcoding the
156 * protocols, because we only want protocols that both cURL
159 * file:// should not be allowed here for security purpose (r67684)
161 * @todo FIXME this is wildly inaccurate and fails to actually check most stuff
163 * @param $uri Mixed: URI to check for validity
166 public static function isValidURI( $uri ) {
168 '/^https?:\/\/[^\/\s]\S*$/D',
175 * This wrapper class will call out to curl (if available) or fallback
176 * to regular PHP if necessary for handling internal HTTP requests.
178 * Renamed from HttpRequest to MWHttpRequest to avoid conflict with
179 * PHP's HTTP extension.
181 class MWHttpRequest
{
182 const SUPPORTS_FILE_POSTS
= false;
185 protected $timeout = 'default';
186 protected $headersOnly = null;
187 protected $postData = null;
188 protected $proxy = null;
189 protected $noProxy = false;
191 * Parameter passed to Curl that specifies whether
192 * to validate SSL certificates.
194 * Setting to 0 disables entirely. Setting to 1 checks
195 * the existence of a CN, but doesn't verify it. Setting
196 * to 2 (the default) actually verifies the host.
198 protected $sslVerifyHost = 2;
199 protected $sslVerifyCert = true;
200 protected $caInfo = null;
201 protected $method = "GET";
202 protected $reqHeaders = array();
204 protected $parsedUrl;
206 protected $maxRedirects = 5;
207 protected $followRedirects = false;
212 protected $cookieJar;
214 protected $headerList = array();
215 protected $respVersion = "0.9";
216 protected $respStatus = "200 Ok";
217 protected $respHeaders = array();
222 * @param $url String: url to use. If protocol-relative, will be expanded to an http:// URL
223 * @param $options Array: (optional) extra params to pass (see Http::request())
225 protected function __construct( $url, $options = array() ) {
226 global $wgHTTPTimeout;
228 $this->url
= wfExpandUrl( $url, PROTO_HTTP
);
229 $this->parsedUrl
= wfParseUrl( $this->url
);
231 if ( !$this->parsedUrl ||
!Http
::isValidURI( $this->url
) ) {
232 $this->status
= Status
::newFatal( 'http-invalid-url' );
234 $this->status
= Status
::newGood( 100 ); // continue
237 if ( isset( $options['timeout'] ) && $options['timeout'] != 'default' ) {
238 $this->timeout
= $options['timeout'];
240 $this->timeout
= $wgHTTPTimeout;
242 if( isset( $options['userAgent'] ) ) {
243 $this->setUserAgent( $options['userAgent'] );
246 $members = array( "postData", "proxy", "noProxy", "sslVerifyHost", "caInfo",
247 "method", "followRedirects", "maxRedirects", "sslVerifyCert", "callback" );
249 foreach ( $members as $o ) {
250 if ( isset( $options[$o] ) ) {
251 // ensure that MWHttpRequest::method is always
252 // uppercased. Bug 36137
253 if ( $o == 'method' ) {
254 $options[$o] = strtoupper( $options[$o] );
256 $this->$o = $options[$o];
260 if ( $this->noProxy
) {
261 $this->proxy
= ''; // noProxy takes precedence
266 * Simple function to test if we can make any sort of requests at all, using
270 public static function canMakeRequests() {
271 return function_exists( 'curl_init' ) ||
wfIniGetBool( 'allow_url_fopen' );
275 * Generate a new request object
276 * @param $url String: url to use
277 * @param $options Array: (optional) extra params to pass (see Http::request())
278 * @throws MWException
279 * @return CurlHttpRequest|PhpHttpRequest
280 * @see MWHttpRequest::__construct
282 public static function factory( $url, $options = null ) {
283 if ( !Http
::$httpEngine ) {
284 Http
::$httpEngine = function_exists( 'curl_init' ) ?
'curl' : 'php';
285 } elseif ( Http
::$httpEngine == 'curl' && !function_exists( 'curl_init' ) ) {
286 throw new MWException( __METHOD__
. ': curl (http://php.net/curl) is not installed, but' .
287 ' Http::$httpEngine is set to "curl"' );
290 switch( Http
::$httpEngine ) {
292 return new CurlHttpRequest( $url, $options );
294 if ( !wfIniGetBool( 'allow_url_fopen' ) ) {
295 throw new MWException( __METHOD__
. ': allow_url_fopen needs to be enabled for pure PHP' .
296 ' http requests to work. If possible, curl should be used instead. See http://php.net/curl.' );
298 return new PhpHttpRequest( $url, $options );
300 throw new MWException( __METHOD__
. ': The setting of Http::$httpEngine is not valid.' );
305 * Get the body, or content, of the response to the request
309 public function getContent() {
310 return $this->content
;
314 * Set the parameters of the request
317 * @todo overload the args param
319 public function setData( $args ) {
320 $this->postData
= $args;
324 * Take care of setting up the proxy (do nothing if "noProxy" is set)
328 public function proxySetup() {
331 if ( $this->proxy ||
!$this->noProxy
) {
335 if ( Http
::isLocalURL( $this->url
) ||
$this->noProxy
) {
337 } elseif ( $wgHTTPProxy ) {
338 $this->proxy
= $wgHTTPProxy ;
339 } elseif ( getenv( "http_proxy" ) ) {
340 $this->proxy
= getenv( "http_proxy" );
345 * Set the refererer header
347 public function setReferer( $url ) {
348 $this->setHeader( 'Referer', $url );
355 public function setUserAgent( $UA ) {
356 $this->setHeader( 'User-Agent', $UA );
360 * Set an arbitrary header
364 public function setHeader( $name, $value ) {
365 // I feel like I should normalize the case here...
366 $this->reqHeaders
[$name] = $value;
370 * Get an array of the headers
373 public function getHeaderList() {
376 if ( $this->cookieJar
) {
377 $this->reqHeaders
['Cookie'] =
378 $this->cookieJar
->serializeToHttpRequest(
379 $this->parsedUrl
['path'],
380 $this->parsedUrl
['host']
384 foreach ( $this->reqHeaders
as $name => $value ) {
385 $list[] = "$name: $value";
392 * Set a read callback to accept data read from the HTTP request.
393 * By default, data is appended to an internal buffer which can be
394 * retrieved through $req->getContent().
396 * To handle data as it comes in -- especially for large files that
397 * would not fit in memory -- you can instead set your own callback,
398 * in the form function($resource, $buffer) where the first parameter
399 * is the low-level resource being read (implementation specific),
400 * and the second parameter is the data buffer.
402 * You MUST return the number of bytes handled in the buffer; if fewer
403 * bytes are reported handled than were passed to you, the HTTP fetch
406 * @param $callback Callback
407 * @throws MWException
409 public function setCallback( $callback ) {
410 if ( !is_callable( $callback ) ) {
411 throw new MWException( 'Invalid MwHttpRequest callback' );
413 $this->callback
= $callback;
417 * A generic callback to read the body of the response from a remote
421 * @param $content String
424 public function read( $fh, $content ) {
425 $this->content
.= $content;
426 return strlen( $content );
430 * Take care of whatever is necessary to perform the URI request.
434 public function execute() {
439 if ( strtoupper( $this->method
) == "HEAD" ) {
440 $this->headersOnly
= true;
443 if ( is_object( $wgTitle ) && !isset( $this->reqHeaders
['Referer'] ) ) {
444 $this->setReferer( wfExpandUrl( $wgTitle->getFullURL(), PROTO_CURRENT
) );
447 $this->proxySetup(); // set up any proxy as needed
449 if ( !$this->callback
) {
450 $this->setCallback( array( $this, 'read' ) );
453 if ( !isset( $this->reqHeaders
['User-Agent'] ) ) {
454 $this->setUserAgent( Http
::userAgent() );
459 * Parses the headers, including the HTTP status code and any
460 * Set-Cookie headers. This function expectes the headers to be
461 * found in an array in the member variable headerList.
463 protected function parseHeader() {
466 foreach ( $this->headerList
as $header ) {
467 if ( preg_match( "#^HTTP/([0-9.]+) (.*)#", $header, $match ) ) {
468 $this->respVersion
= $match[1];
469 $this->respStatus
= $match[2];
470 } elseif ( preg_match( "#^[ \t]#", $header ) ) {
471 $last = count( $this->respHeaders
[$lastname] ) - 1;
472 $this->respHeaders
[$lastname][$last] .= "\r\n$header";
473 } elseif ( preg_match( "#^([^:]*):[\t ]*(.*)#", $header, $match ) ) {
474 $this->respHeaders
[strtolower( $match[1] )][] = $match[2];
475 $lastname = strtolower( $match[1] );
479 $this->parseCookies();
483 * Sets HTTPRequest status member to a fatal value with the error
484 * message if the returned integer value of the status code was
485 * not successful (< 300) or a redirect (>=300 and < 400). (see
486 * RFC2616, section 10,
487 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html for a
488 * list of status codes.)
490 protected function setStatus() {
491 if ( !$this->respHeaders
) {
492 $this->parseHeader();
495 if ( (int)$this->respStatus
> 399 ) {
496 list( $code, $message ) = explode( " ", $this->respStatus
, 2 );
497 $this->status
->fatal( "http-bad-status", $code, $message );
502 * Get the integer value of the HTTP status code (e.g. 200 for "200 Ok")
503 * (see RFC2616, section 10, http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
504 * for a list of status codes.)
508 public function getStatus() {
509 if ( !$this->respHeaders
) {
510 $this->parseHeader();
513 return (int)$this->respStatus
;
518 * Returns true if the last status code was a redirect.
522 public function isRedirect() {
523 if ( !$this->respHeaders
) {
524 $this->parseHeader();
527 $status = (int)$this->respStatus
;
529 if ( $status >= 300 && $status <= 303 ) {
537 * Returns an associative array of response headers after the
538 * request has been executed. Because some headers
539 * (e.g. Set-Cookie) can appear more than once the, each value of
540 * the associative array is an array of the values given.
544 public function getResponseHeaders() {
545 if ( !$this->respHeaders
) {
546 $this->parseHeader();
549 return $this->respHeaders
;
553 * Returns the value of the given response header.
555 * @param $header String
558 public function getResponseHeader( $header ) {
559 if ( !$this->respHeaders
) {
560 $this->parseHeader();
563 if ( isset( $this->respHeaders
[strtolower ( $header ) ] ) ) {
564 $v = $this->respHeaders
[strtolower ( $header ) ];
565 return $v[count( $v ) - 1];
572 * Tells the MWHttpRequest object to use this pre-loaded CookieJar.
574 * @param $jar CookieJar
576 public function setCookieJar( $jar ) {
577 $this->cookieJar
= $jar;
581 * Returns the cookie jar in use.
585 public function getCookieJar() {
586 if ( !$this->respHeaders
) {
587 $this->parseHeader();
590 return $this->cookieJar
;
594 * Sets a cookie. Used before a request to set up any individual
595 * cookies. Used internally after a request to parse the
596 * Set-Cookie headers.
602 public function setCookie( $name, $value = null, $attr = null ) {
603 if ( !$this->cookieJar
) {
604 $this->cookieJar
= new CookieJar
;
607 $this->cookieJar
->setCookie( $name, $value, $attr );
611 * Parse the cookies in the response headers and store them in the cookie jar.
613 protected function parseCookies() {
614 if ( !$this->cookieJar
) {
615 $this->cookieJar
= new CookieJar
;
618 if ( isset( $this->respHeaders
['set-cookie'] ) ) {
619 $url = parse_url( $this->getFinalUrl() );
620 foreach ( $this->respHeaders
['set-cookie'] as $cookie ) {
621 $this->cookieJar
->parseCookieResponseHeader( $cookie, $url['host'] );
627 * Returns the final URL after all redirections.
629 * Relative values of the "Location" header are incorrect as stated in RFC, however they do happen and modern browsers support them.
630 * This function loops backwards through all locations in order to build the proper absolute URI - Marooned at wikia-inc.com
632 * Note that the multiple Location: headers are an artifact of CURL -- they
633 * shouldn't actually get returned this way. Rewrite this when bug 29232 is
634 * taken care of (high-level redirect handling rewrite).
638 public function getFinalUrl() {
639 $headers = $this->getResponseHeaders();
641 //return full url (fix for incorrect but handled relative location)
642 if ( isset( $headers[ 'location' ] ) ) {
643 $locations = $headers[ 'location' ];
645 $foundRelativeURI = false;
646 $countLocations = count($locations);
648 for ( $i = $countLocations - 1; $i >= 0; $i-- ) {
649 $url = parse_url( $locations[ $i ] );
651 if ( isset($url[ 'host' ]) ) {
652 $domain = $url[ 'scheme' ] . '://' . $url[ 'host' ];
653 break; //found correct URI (with host)
655 $foundRelativeURI = true;
659 if ( $foundRelativeURI ) {
661 return $domain . $locations[ $countLocations - 1 ];
663 $url = parse_url( $this->url
);
664 if ( isset($url[ 'host' ]) ) {
665 return $url[ 'scheme' ] . '://' . $url[ 'host' ] . $locations[ $countLocations - 1 ];
669 return $locations[ $countLocations - 1 ];
677 * Returns true if the backend can follow redirects. Overridden by the
681 public function canFollowRedirects() {
687 * MWHttpRequest implemented using internal curl compiled into PHP
689 class CurlHttpRequest
extends MWHttpRequest
{
690 const SUPPORTS_FILE_POSTS
= true;
692 static $curlMessageMap = array(
693 6 => 'http-host-unreachable',
694 28 => 'http-timed-out'
697 protected $curlOptions = array();
698 protected $headerText = "";
705 protected function readHeader( $fh, $content ) {
706 $this->headerText
.= $content;
707 return strlen( $content );
710 public function execute() {
713 if ( !$this->status
->isOK() ) {
714 return $this->status
;
717 $this->curlOptions
[CURLOPT_PROXY
] = $this->proxy
;
718 $this->curlOptions
[CURLOPT_TIMEOUT
] = $this->timeout
;
719 $this->curlOptions
[CURLOPT_HTTP_VERSION
] = CURL_HTTP_VERSION_1_0
;
720 $this->curlOptions
[CURLOPT_WRITEFUNCTION
] = $this->callback
;
721 $this->curlOptions
[CURLOPT_HEADERFUNCTION
] = array( $this, "readHeader" );
722 $this->curlOptions
[CURLOPT_MAXREDIRS
] = $this->maxRedirects
;
723 $this->curlOptions
[CURLOPT_ENCODING
] = ""; # Enable compression
725 /* not sure these two are actually necessary */
726 if ( isset( $this->reqHeaders
['Referer'] ) ) {
727 $this->curlOptions
[CURLOPT_REFERER
] = $this->reqHeaders
['Referer'];
729 $this->curlOptions
[CURLOPT_USERAGENT
] = $this->reqHeaders
['User-Agent'];
731 if ( isset( $this->sslVerifyHost
) ) {
732 $this->curlOptions
[CURLOPT_SSL_VERIFYHOST
] = $this->sslVerifyHost
;
735 if ( isset( $this->sslVerifyCert
) ) {
736 $this->curlOptions
[CURLOPT_SSL_VERIFYPEER
] = $this->sslVerifyCert
;
739 if ( $this->caInfo
) {
740 $this->curlOptions
[CURLOPT_CAINFO
] = $this->caInfo
;
743 if ( $this->headersOnly
) {
744 $this->curlOptions
[CURLOPT_NOBODY
] = true;
745 $this->curlOptions
[CURLOPT_HEADER
] = true;
746 } elseif ( $this->method
== 'POST' ) {
747 $this->curlOptions
[CURLOPT_POST
] = true;
748 $this->curlOptions
[CURLOPT_POSTFIELDS
] = $this->postData
;
749 // Suppress 'Expect: 100-continue' header, as some servers
750 // will reject it with a 417 and Curl won't auto retry
751 // with HTTP 1.0 fallback
752 $this->reqHeaders
['Expect'] = '';
754 $this->curlOptions
[CURLOPT_CUSTOMREQUEST
] = $this->method
;
757 $this->curlOptions
[CURLOPT_HTTPHEADER
] = $this->getHeaderList();
759 $curlHandle = curl_init( $this->url
);
761 if ( !curl_setopt_array( $curlHandle, $this->curlOptions
) ) {
762 throw new MWException( "Error setting curl options." );
765 if ( $this->followRedirects
&& $this->canFollowRedirects() ) {
766 wfSuppressWarnings();
767 if ( ! curl_setopt( $curlHandle, CURLOPT_FOLLOWLOCATION
, true ) ) {
768 wfDebug( __METHOD__
. ": Couldn't set CURLOPT_FOLLOWLOCATION. " .
769 "Probably safe_mode or open_basedir is set.\n" );
770 // Continue the processing. If it were in curl_setopt_array,
771 // processing would have halted on its entry
776 if ( false === curl_exec( $curlHandle ) ) {
777 $code = curl_error( $curlHandle );
779 if ( isset( self
::$curlMessageMap[$code] ) ) {
780 $this->status
->fatal( self
::$curlMessageMap[$code] );
782 $this->status
->fatal( 'http-curl-error', curl_error( $curlHandle ) );
785 $this->headerList
= explode( "\r\n", $this->headerText
);
788 curl_close( $curlHandle );
790 $this->parseHeader();
793 return $this->status
;
799 public function canFollowRedirects() {
800 if ( strval( ini_get( 'open_basedir' ) ) !== '' ||
wfIniGetBool( 'safe_mode' ) ) {
801 wfDebug( "Cannot follow redirects in safe mode\n" );
805 if ( !defined( 'CURLOPT_REDIR_PROTOCOLS' ) ) {
806 wfDebug( "Cannot follow redirects with libcurl < 7.19.4 due to CVE-2009-0037\n" );
814 class PhpHttpRequest
extends MWHttpRequest
{
820 protected function urlToTcp( $url ) {
821 $parsedUrl = parse_url( $url );
823 return 'tcp://' . $parsedUrl['host'] . ':' . $parsedUrl['port'];
826 public function execute() {
829 if ( is_array( $this->postData
) ) {
830 $this->postData
= wfArrayToCGI( $this->postData
);
833 if ( $this->parsedUrl
['scheme'] != 'http' &&
834 $this->parsedUrl
['scheme'] != 'https' ) {
835 $this->status
->fatal( 'http-invalid-scheme', $this->parsedUrl
['scheme'] );
838 $this->reqHeaders
['Accept'] = "*/*";
839 if ( $this->method
== 'POST' ) {
840 // Required for HTTP 1.0 POSTs
841 $this->reqHeaders
['Content-Length'] = strlen( $this->postData
);
842 if( !isset( $this->reqHeaders
['Content-Type'] ) ) {
843 $this->reqHeaders
['Content-Type'] = "application/x-www-form-urlencoded";
848 if ( $this->proxy
) {
849 $options['proxy'] = $this->urlToTCP( $this->proxy
);
850 $options['request_fulluri'] = true;
853 if ( !$this->followRedirects
) {
854 $options['max_redirects'] = 0;
856 $options['max_redirects'] = $this->maxRedirects
;
859 $options['method'] = $this->method
;
860 $options['header'] = implode( "\r\n", $this->getHeaderList() );
861 // Note that at some future point we may want to support
862 // HTTP/1.1, but we'd have to write support for chunking
863 // in version of PHP < 5.3.1
864 $options['protocol_version'] = "1.0";
866 // This is how we tell PHP we want to deal with 404s (for example) ourselves.
867 // Only works on 5.2.10+
868 $options['ignore_errors'] = true;
870 if ( $this->postData
) {
871 $options['content'] = $this->postData
;
874 $options['timeout'] = $this->timeout
;
876 $context = stream_context_create( array( 'http' => $options ) );
878 $this->headerList
= array();
886 wfSuppressWarnings();
887 $fh = fopen( $url, "r", false, $context );
894 $result = stream_get_meta_data( $fh );
895 $this->headerList
= $result['wrapper_data'];
896 $this->parseHeader();
898 if ( !$this->followRedirects
) {
902 # Handle manual redirection
903 if ( !$this->isRedirect() ||
$reqCount > $this->maxRedirects
) {
906 # Check security of URL
907 $url = $this->getResponseHeader( "Location" );
909 if ( !Http
::isValidURI( $url ) ) {
910 wfDebug( __METHOD__
. ": insecure redirection\n" );
917 if ( $fh === false ) {
918 $this->status
->fatal( 'http-request-error' );
919 return $this->status
;
922 if ( $result['timed_out'] ) {
923 $this->status
->fatal( 'http-timed-out', $this->url
);
924 return $this->status
;
927 // If everything went OK, or we received some error code
928 // get the response body content.
929 if ( $this->status
->isOK()
930 ||
(int)$this->respStatus
>= 300) {
931 while ( !feof( $fh ) ) {
932 $buf = fread( $fh, 8192 );
934 if ( $buf === false ) {
935 $this->status
->fatal( 'http-read-error' );
939 if ( strlen( $buf ) ) {
940 call_user_func( $this->callback
, $fh, $buf );
946 return $this->status
;