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php exec http url [message #185182] Thu, 06 March 2014 15:42 Go to next message
bishop2001 is currently offline  bishop2001
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Greetings,
I am trying to execute a shell script which is residing on a webserver on a remote machine with no luck. I have tried the following. It looks like it runs but I never see the output from the script on machine2. Any suggestions. Thanks,

from machine 1:
echo exec('http://machine2/script.sh);

and

from machine1:
<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
?>
Re: php exec http url [message #185183 is a reply to message #185182] Thu, 06 March 2014 16:04 Go to previous messageGo to next message
Jerry Stuckle is currently offline  Jerry Stuckle
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On 3/6/2014 3:42 PM, bishop2001 wrote:
> Greetings,
> I am trying to execute a shell script which is residing on a webserver on a remote machine with no luck. I have tried the following. It looks like it runs but I never see the output from the script on machine2. Any suggestions. Thanks,
>
> from machine 1:
> echo exec('http://machine2/script.sh);
>
> and
>
> from machine1:
> <?php
> $ch = curl_init();
> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
> curl_setopt($ch, CURLOPT_HEADER, 0);
> curl_exec($ch);
> curl_close($ch);
> ?>
>

What is the result of your curl_exec()? How do you know the shell
script is working? What happens when you try to execute the shell
script from a browser?


--
==================
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jstucklex(at)attglobal(dot)net
==================
Re: php exec http url [message #185188 is a reply to message #185182] Fri, 07 March 2014 09:09 Go to previous messageGo to next message
Thomas 'PointedEars'  is currently offline  Thomas 'PointedEars'
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bishop2001 wrote:
^^^^^^^^^^
Please fix.

> I am trying to execute a shell script which is residing on a webserver on
> a remote machine with no luck. I have tried the following. It looks like
> it runs but I never see the output from the script on machine2. Any
> suggestions. Thanks,
>
> from machine 1:
> echo exec('http://machine2/script.sh);

exec() executes commands in the shell running on the local machine (where
PHP is running), assuming it is allowed (for security reasons, it usually is
not). http://machine2/script.sh is not a command in any known shell
script language.

> and
>
> from machine1:
> <?php
> $ch = curl_init();
> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
> curl_setopt($ch, CURLOPT_HEADER, 0);
> curl_exec($ch);
> curl_close($ch);
> ?>

Even if a Web server would serve that resource, it would not execute it by
default, IOW by default you would receive only the source code of the shell
script, not its output.


PointedEars
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(This won't prevent people from viewing your source, but no one
will want to steal it.)
-- from <http://www.vortex-webdesign.com/help/hidesource.htm> (404-comp.)
Re: php exec http url [message #185189 is a reply to message #185188] Fri, 07 March 2014 09:55 Go to previous messageGo to next message
The Natural Philosoph is currently offline  The Natural Philosoph
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On 07/03/14 14:09, Thomas 'PointedEars' Lahn wrote:
> bishop2001 wrote:
> ^^^^^^^^^^
> Please fix.
>
>> I am trying to execute a shell script which is residing on a webserver on
>> a remote machine with no luck. I have tried the following. It looks like
>> it runs but I never see the output from the script on machine2. Any
>> suggestions. Thanks,
>>
>> from machine 1:
>> echo exec('http://machine2/script.sh);
>
> exec() executes commands in the shell running on the local machine (where
> PHP is running), assuming it is allowed (for security reasons, it usually is
> not). http://machine2/script.sh is not a command in any known shell
> script language.
>
>> and
>>
>> from machine1:
>> <?php
>> $ch = curl_init();
>> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
>> curl_setopt($ch, CURLOPT_HEADER, 0);
>> curl_exec($ch);
>> curl_close($ch);
>> ?>
>
> Even if a Web server would serve that resource, it would not execute it by
> default, IOW by default you would receive only the source code of the shell
> script, not its output.
>
>
> PointedEars
>

The way to do this is to set php up on the remote server to have a web
page run that script.

e.g. on the machine2 that runs a script have a php file that does this

echo (exec('script.sh'));

and then on machine1 simply use curl to point not at the script, but at
the URL of the php file that actually runs that script.





--
Ineptocracy

(in-ep-toc’-ra-cy) – a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.
Re: php exec http url [message #185190 is a reply to message #185189] Fri, 07 March 2014 10:36 Go to previous messageGo to next message
Thomas 'PointedEars'  is currently offline  Thomas 'PointedEars'
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The Natural Philosopher wrote:
^^^^^^^^^^^^^^^^^^^^^^^
Please fix.

> On 07/03/14 14:09, Thomas 'PointedEars' Lahn wrote:
>> bishop2001 wrote:
>>> from machine1:
>>> <?php
>>> $ch = curl_init();
>>> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
>>> curl_setopt($ch, CURLOPT_HEADER, 0);
>>> curl_exec($ch);
>>> curl_close($ch);
>>> ?>
>>
>> Even if a Web server would serve that resource, it would not execute it
>> by default, IOW by default you would receive only the source code of the
>> shell script, not its output.
>
> The way to do this is to set php up on the remote server to have a web
> page run that script.
>
> e.g. on the machine2 that runs a script have a php file that does this
>
> echo (exec('script.sh'));
>
> and then on machine1 simply use curl to point not at the script, but at
> the URL of the php file that actually runs that script.

That is not the only way.

Your From header field still violates RFC 5536, and several other
conventions and rules.

Learn to quote.


PointedEars
--
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Re: php exec http url [message #185192 is a reply to message #185182] Fri, 07 March 2014 13:12 Go to previous messageGo to next message
Denis McMahon is currently offline  Denis McMahon
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On Thu, 06 Mar 2014 12:42:52 -0800, bishop2001 wrote:

> Greetings,
> I am trying to execute a shell script which is residing on a webserver
> on a remote machine with no luck. I have tried the following. It looks
> like it runs but I never see the output from the script on machine2. Any
> suggestions. Thanks,

Firstly, you say "It looks like it runs"

What evidence do you have for this?

> from machine 1:
> echo exec('http://machine2/script.sh);

What entries appear in the webserver logs on the server after attempting
this? You probably want to check any log file in the apache logs dir that
has it's timestamp modified when you try and access the script.

> from machine1:
> <?php $ch = curl_init();
> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
> curl_setopt($ch, CURLOPT_HEADER, 0);
> curl_exec($ch);
> curl_close($ch);
> ?>

What entries appear in the webserver logs on the server after attempting
this?

Are you sure that the webserver is configured to run .sh files as shell
scripts and pipe the output of the script back to the http session?

Are you sure that the script is executable by the webserver process?
Execute permissions for relevant users / groups / world?

--
Denis McMahon, denismfmcmahon(at)gmail(dot)com
Re: php exec http url [message #185193 is a reply to message #185190] Fri, 07 March 2014 15:33 Go to previous message
The Natural Philosoph is currently offline  The Natural Philosoph
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On 07/03/14 15:36, Thomas 'PointedEars' Lahn wrote:
> The Natural Philosopher wrote:
> ^^^^^^^^^^^^^^^^^^^^^^^
> Please fix.
>
>> On 07/03/14 14:09, Thomas 'PointedEars' Lahn wrote:
>>> bishop2001 wrote:
>>>> from machine1:
>>>> <?php
>>>> $ch = curl_init();
>>>> curl_setopt($ch, CURLOPT_URL, "http://machine2/script.sh");
>>>> curl_setopt($ch, CURLOPT_HEADER, 0);
>>>> curl_exec($ch);
>>>> curl_close($ch);
>>>> ?>
>>>
>>> Even if a Web server would serve that resource, it would not execute it
>>> by default, IOW by default you would receive only the source code of the
>>> shell script, not its output.
>>
>> The way to do this is to set php up on the remote server to have a web
>> page run that script.
>>
>> e.g. on the machine2 that runs a script have a php file that does this
>>
>> echo (exec('script.sh'));
>>
>> and then on machine1 simply use curl to point not at the script, but at
>> the URL of the php file that actually runs that script.
>
> That is not the only way.
>
> Your From header field still violates RFC 5536, and several other
> conventions and rules.
>
> Learn to quote.
>
>
> PointedEars
>

Fuck off noddy

--
Ineptocracy

(in-ep-toc’-ra-cy) – a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.
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