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Bug #75894 php_stream_input_seek() broken
Submitted: 2018-01-31 16:28 UTC Modified: 2021-08-01 04:22 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: davide dot romanini at gmail dot com Assigned: cmb (profile)
Status: No Feedback Package: Streams related
PHP Version: 7.1.14RC1 OS:
Private report: No CVE-ID: None
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 [2018-01-31 16:28 UTC] davide dot romanini at gmail dot com
Description:
------------
The php://input stream behaves differently from other standard streams. In particular, seeking is completely broken. Basically the stream works only when used forward-only, consume-once (eg: file_get_contents('php://input')).

I didn't found the bug reported here (I searched under streams related bugs using the 'seek' keyword). 

I sketched a possible fix with tests here: https://github.com/php/php-src/compare/PHP-7.1...davide-romanini:fix-php-stream-input-seek

Test script:
---------------
--POST--
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum ante ex, placerat nec sollicitudin vitae, ultricies molestie nisi. Maecenas lacus magna, augue.
--FILE--
<?php
$i = fopen('php://input', 'r');
fseek($i, 5);
var_dump(fread($i, 10));
rewind($i);
var_dump(fread($i, 5));
fseek($i, -6, SEEK_END);
var_dump(fread($i, 6));
?>
--EXPECT--
string(10) " ipsum dol"
string(5) "Lorem"
string(6) "augue."


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 [2021-07-20 09:59 UTC] cmb@php.net
-Status: Open +Status: Feedback -Assigned To: +Assigned To: cmb
 [2021-07-20 09:59 UTC] cmb@php.net
> Basically the stream works only when used forward-only,
> consume-once (eg: file_get_contents('php://input')).

This is actually what I would expect.  Maybe that needs to be
documented more clearly?  Wrt. your patch – did you consider to
make a pull request[1]?

[1] <https://github.com/php/php-src/pulls>
 [2021-08-01 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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