PHP curl: curl_setopt() fopencookie failed

I'm trying to write a script, which would cache images, but am stuck with the following error message:

Nov  4 12:55:19 centos httpd: PHP Fatal error:  curl_setopt() [<a href='function.curl-setopt'>function.curl-setopt</a>]: fopencookie failed in /var/www/html/proxy3.php on line 6

I have prepared 开发者_JAVA百科a simpler script which still has this problem:

<?php
#phpinfo();
$fh = fopen('/tmp/yahoo.html', 'xb');
if ($fh) {
        $ch = curl_init('http://www.yahoo.com/');
        curl_setopt($ch, CURLOPT_FILE, $fh); # XXX the line 6
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
        curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
        #curl_setopt($ch, CURLOPT_COOKIEJAR, '/dev/null');
        #curl_setopt($ch, CURLOPT_COOKIEFILE, '/dev/null');
        #curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
        #curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
        curl_exec($ch);

        if(!curl_errno($ch)) {
                 $info = curl_getinfo($ch);
                  echo 'Took '.$info['total_time'] .
                    's to send a request to '.$info['url'];
        }
        curl_close($ch);
        fclose($fh);
} else {
        echo 'Can not open /tmp/yahoo.html';
}
?>

In the /tmp dir I then see a zero-sized file:

afarber@centos:html> ls -alZ /tmp/yahoo.html
-rw-r--r--  apache apache user_u:object_r:httpd_tmp_t      /tmp/yahoo.html

Does anybody please have an idea, what is going wrong here?

I've tried setting/not setting CURLOPT_COOKIEJAR and CURLOPT_COOKIEFILE - to /dev/null and/or to /tmp/cookies.txt. I've tried sudo touch /tmp/cookies.txt; sudo chown apache.apache /tmp/cookies.txt too. This just doesn't work.

Actually I don't need cookies in my script, I'd be happy to disable them in curl.

I'm using fopen(... , "xb") on purpose, so that only 1 script instance will write to the cached file in my real script.

I'm using CentOS 5.5 with php-5.1.6-27.el5 and unmodified php.ini

Thank you, Alex

P.S. And here is my real image proxy script, which fails with the same fopencookie error message. I can't use fopen(...., 'wb') there, I must use fopen(.... 'xb'):

<?php

define('MIN_SIZE', 1024);
define('MAX_SIZE', 1024 * 1024);
define('CACHE_DIR', '/var/www/cached_avatars/');

$img = urldecode($_GET['img']);
# URL sanity checks omitted here for brevity
$cached = CACHE_DIR . md5($img);
$writefh = @fopen($cached, 'xb');
# the file is not cached yet, download it!
if ($writefh) {
        $ch = curl_init($img);
        curl_setopt($ch, CURLOPT_FILE, $writefh);
        curl_setopt($ch, CURLOPT_HEADER, FALSE);
        #curl_setopt($ch, CURLOPT_REFERER, $matches[1]);
        curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
        #curl_setopt($ch, CURLOPT_COOKIEJAR, '/dev/null');
        #curl_setopt($ch, CURLOPT_COOKIEFILE, '/dev/null');
        #curl_setopt($ch, CURLOPT_COOKIEJAR, CACHE_DIR . 'cookies.txt');
        #curl_setopt($ch, CURLOPT_COOKIEFILE, CACHE_DIR . 'cookies.txt');
        curl_exec($ch);

        $error    = curl_errno($ch);
        $length   = curl_getinfo($ch, CURLINFO_SIZE_DOWNLOAD);
        $mime     = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
        $is_image = ($mime != NULL &&
                     (stripos($mime, 'image/gif') !== FALSE ||
                      stripos($mime, 'image/png') !== FALSE ||
                      stripos($mime, 'image/jpg') !== FALSE ||
                      stripos($mime, 'image/jpeg') !== FALSE));

        curl_close($ch);
        fclose($writefh);

        if ($error || $length < MIN_SIZE || $length > MAX_SIZE || !$is_image) {
                unlink($cached);
                exit('Download failed: ' . $img);
        }
} else {
        $finfo  = finfo_open(FILEINFO_MIME);
        $mime   = finfo_file($finfo, $cached);
        $length = filesize($cached);
        finfo_close($finfo);
}

$readfh = fopen($cached, 'rb');
if ($readfh) {
        header('Content-Type: ' . $mime);
        header('Content-Length: ' . $length);

        while (!feof($readfh)) {
                $buf = fread($readfh, 8192);
                echo $buf;
        }

        fclose($readfh);

}

?>

I think the problem is because of the x mode. fopen when used with x mode returns false if the file already exists. In your case the file already exists, $fh will be false and when this is passed to curl_setopt you get this error.

To fix this try changing xb to wb.

If what you want is only one script to access the file at the same time, you should use cb option + flock:

$fh = fopen('/tmp/yahoo.html', 'cb');
if (flock($fh, LOCK_EX | LOCK_NB) {
    //ftruncate($fh, 0); -- truncate the file if that's what you want
    //continue as usual
}
else {
    //could not obtain lock (without waiting)
}

Thanks for all the responses, I've ended up with this PHP/cURL-script for caching images (needed by Flash apps to circumvent a missing crossdomain.xml) - seems to work ok with CentOS 5 Linux and php-5.1.6-27.el5:

<?php

define('MIN_SIZE', 512);
define('MAX_SIZE', 1024 * 1024);
define('CACHE_DIR', '/var/www/cached_avatars/');

$img = urldecode($_GET['img']);
# img sanity checks omitted here
$cached = CACHE_DIR . md5($img);

if (is_readable($cached)) {
        $finfo  = finfo_open(FILEINFO_MIME);
        $mime   = finfo_file($finfo, $cached);
        $length = filesize($cached);
        finfo_close($finfo);
} else {
        $writefh = fopen($cached, 'wb');
        if ($writefh) {
                flock($writefh, LOCK_EX);
                $ch = curl_init($img);
                curl_setopt($ch, CURLOPT_FILE, $writefh);
                curl_setopt($ch, CURLOPT_HEADER, FALSE);
                curl_setopt($ch, CURLOPT_REFERER, $matches[1]);
                curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
                curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
                curl_setopt($ch, CURLOPT_AUTOREFERER, TRUE);
                curl_exec($ch);

                $error    = curl_errno($ch);
                $length   = curl_getinfo($ch, CURLINFO_SIZE_DOWNLOAD);
                $mime     = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
                $is_image = ($mime != NULL &&
                             (stripos($mime, 'image/gif') !== FALSE ||
                              stripos($mime, 'image/png') !== FALSE ||
                              stripos($mime, 'image/jpg') !== FALSE ||
                              stripos($mime, 'image/jpeg') !== FALSE));

                curl_close($ch);
                fclose($writefh);
                if ($error || $length < MIN_SIZE || $length > MAX_SIZE || !$is_image) {
                        unlink($cached);
                        exit('Download failed: ' . $img);
                }
        }
}

$readfh = fopen($cached, 'rb');
if ($readfh) {
        header('Content-Type: ' . $mime);
        header('Content-Length: ' . $length);

        flock($readfh, LOCK_SH);

        while (!feof($readfh)) {
                $buf = fread($readfh, 8192);
                echo $buf;
        }

        fclose($readfh);
}

?>