How can I debug PHP cURL not triggering a request?

Question

Environment

PHP Version : PHP 5.6.21
cURL Version : curl 7.29.0
Web Server : Nginx
Linux : Cent OS

Description

I have this CURL in PHP.

$headers = array(
"Content-Type: application/x-www-form-urlencoded",
"Authorization: Basic " . $auth_code
);

$data = 'grant_type=authorization_code&code='.$code;

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$AUTH_TOKEN_URL);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT_MS, 1000);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_VERBOSE, TRUE);
curl_setopt($ch, CURLOPT_ENCODING , "gzip");
curl_setopt($ch, CURLOPT_USERAGENT,'php');
curl_setopt($ch, CURLOPT_HTTPHEADER,$headers);
$info = curl_getinfo($ch);
$result = curl_exec($ch);

I did a Wireshark capture, I don't any GET/POST requests initiating.

What could possibly prevent it?

What else should I look into?

I've tried print out these 2 values

**dd($ch);**

I got

"ch" => curl resource @10 ▼
    url: "https://www.web.com/oauth"
    content_type: null
    http_code: 0
    header_size: 0
    request_size: 0
    filetime: -1
    ssl_verify_result: 0
    redirect_count: 0
    total_time: 0.004216
    namelookup_time: 0.004148
    connect_time: 0.113475
    pretransfer_time: 0.0
    size_upload: 0.0
    size_download: 0.0
    speed_download: 0.0
    speed_upload: 0.0
    download_content_length: -1.0
    upload_content_length: -1.0
    starttransfer_time: 0.0
    redirect_time: 0.0
    redirect_url: ""
    primary_ip: "8.8.8.8"
    certinfo: []
    primary_port: 443
    local_ip: "10.0.129.127"
    local_port: 56907
}

With:

**dd($info);**

I got

"info" => array:26 [▼
"url" => "https://www.web.com/oauth"
"content_type" => null
"http_code" => 0
"header_size" => 0
"request_size" => 0
"filetime" => 0
"ssl_verify_result" => 0
"redirect_count" => 0
"total_time" => 0.0
"namelookup_time" => 0.0
"connect_time" => 0.0
"pretransfer_time" => 0.0
"size_upload" => 0.0
"size_download" => 0.0
"speed_download" => 0.0
"speed_upload" => 0.0
"download_content_length" => -1.0
"upload_content_length" => -1.0
"starttransfer_time" => 0.0
"redirect_time" => 0.0
"redirect_url" => ""
"primary_ip" => ""
"certinfo" => []
"primary_port" => 0
"local_ip" => ""
"local_port" => 0
]

nothing seems to use in there.

Either in /var/log/messages or via journalctl depending on the version of CentOS. — Ignacio Vazquez-Abrams
– Ignacio Vazquez-Abrams, Commented Oct 25, 2017 at 1:44
Create a PHP INFO file phpinfo.php with content below and on the server and load it on the browser - then search that info for curl <?php phpinfo(); ?> — Dieskim
– Dieskim, Commented Oct 25, 2017 at 1:58
Php - Debugging Curl - you can save curl error into the file. Look at $verbose = ... — ljubadr
– ljubadr, Commented Oct 25, 2017 at 2:22

Ignacio Vazquez-Abrams · Accepted Answer · 2017-10-25 01:42:28Z

2

SELinux is preventing the httpd process from making a network connection.

setsebool -P httpd_can_network_connect 1

See the httpd_selinux(8) man page for details.

answered Oct 25, 2017 at 1:42

Ignacio Vazquez-Abrams

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4 Comments

code-8 Over a year ago

Is there any VM or linux details that I can share with u ?

code-8 Over a year ago

/var/log/messages - is empty.

code-8 Over a year ago

/var/log/nginx/access.log - is empty

code-8 Over a year ago

Do I need to restart any kind of service after running your suggestion setsebool -P httpd_can_network_connect 1 ???

Chris · Accepted Answer · 2017-10-25 03:06:51Z

1

You could try strace if you need some further investigation.

If this code is triggered for example by visiting the page '/mycode.php':

strace -tt -e trace=sendto,connect,open,write,read php /path/to/your/app/mycode.php

If your code is executed through a framework or handled though an entry point such as index.php:

HTTP_HOST=www.yourdomain.com REQUEST_URI=/mycode.php strace -tt -e trace=sendto,connect,open,write,read php /path/to/your/app/index.php

The output from this should be able to point you towards the source of the issue (eg, certain files not opening, proccesses not starting)

answered Oct 25, 2017 at 3:06

Chris

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