| Re: PHP script to only be accessed by cron [message #175290 is a reply to message #175289] |
Wed, 31 August 2011 19:49   |
The Natural Philosoph
Messages: 993
Registered: September 2010
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Senior Member |
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Luuk wrote:
> On 31-08-2011 10:20, The Natural Philosopher wrote:
>> jwcarlton wrote:
>>> I'm writing a PHP script that I want to ONLY be accessed by a
>>> predefined cron. Can you guys suggest a way to prevent non-cron
>>> accesses?
>>>
>> 1/. Write it in a proper language for this purpose, C, not php
>
>
> The purpose of this script is not give, at least not by the OP.
> Can you tell here why PHP would not be the 'proper language'?
>
the main thinking Luuk was that to do what he wanted would invove a lot
of calls to libraries that are not a standard part of PHP but are a part
of the C library
Although I stand corrected because get_ppid() does seem to exist in PHP,
and that's half the battle.
I cant remember the way to programmatically read a process table as ps
does, but I am fairly sure php doesn't have a function to do it.
> PHP can be used form the comman line quit well, see:
> http://www.php.net/manual/en/features.commandline.interactive.php
> for some examples
>
> There's NO need to learn how to program in C, if one can do this task in PHP
>
Well firstly if you can code PHP its not a huge step to C, especially if
you have some crib code.
secondly its a shade more secure if you hide passwords and so on inside
nmunged data.
But my real reason was access to system libaries that dont as a rule
come with PHP.
Libproc.a is the standard way I believe to examine the /proc filesystem
where all this info exists.
In the end its a tradeoff between writing something in PHP to
interrogate that, and using some pre-existent source code in C
I've had similar issues with certain things where PHP did not handle
concurrent accesses to certain graphics libraries well. Very strange
bugs happened. Re wrote it in C and no more problems as I used a
different graphics library that PHP did not support.
I am a great fan of PHP but there are times when I abandon it because -
mainly - I need a library it doesn't support.
And I have not yet tackled the issues of writing my own extensions to it.
And although I know you can, I'd rather use shell or C for cron scripts.
PHP can be used, but for me its strengths lie in its easy merging with
HTML and mySQL: Althouh even there, I have written database interfaces
in C easily enough. C just doesn't do outputting of straight HTML the
way a ?> does ! :-)
I suppose at the end of the day is no big deal to write a massive
printf() statement, but is more tedious than a ?>
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