topic Re: unix and cgi scripts in Operating System - HP-UX

unix and cgi scripts

Shibin_2 — Thu, 06 Nov 2008 03:01:50 GMT

Hi,

I have recently migrated a web-based application from one server to another server. At first look, there is no problem because, I can see the web-page and can navigate to other html pages. At one section, we uses a cgi script and the front page of cgi script is visible. Inside that script, there are several important scripts, which are not at all functioning.

How can I check or debug this cgi script for the consistency and how do I determine, which module is not functioning? Any idea.

My httpd.conf allows all for cgi execution (shown below); but the script somehow is not functioning.

ScriptAlias /cgi-bin/ "/apache/cgi-bin/"

Allowoverride None
Options None
Order allow,deny
Allow from all

AddHandler cgi-script .cgi

Re: unix and cgi scripts

Steven Schweda — Thu, 06 Nov 2008 03:41:39 GMT

> [...] the front page of cgi script is
> visible. [...]

Do you mean you are seeing the script itself,
not the expected output from running the
script?

> [...] from one server to another server.

> My httpd.conf [...]

What's different between the two servers?
httpd.conf? Other files it might include?
File ownership? Permissions?

Re: unix and cgi scripts

Shibin_2 — Thu, 06 Nov 2008 03:54:30 GMT

The web page starts with index.html, which loads properly, no problem. Then, it has two modules.

1. Goes to useradmin.cgi
2. goes to other functions.

Both modules load properly and second modules work perfectly, since that module has only minimal scripts/functions.

Useradmin.cgi module loads as expected, but inside that different scripts, functions, which calls to different cgi scripts as well as UNIX commands. These are not functioning. I have copied all the files from the earlier server and just pasted here on the same location.

I don't think so, it is a permission issue, because, most of the file has 755 permission. Both servers using the same apache, httpd.conf and other files.

Can I debug this useradmin.cgi script using any tools ?

Re: unix and cgi scripts

Dennis Handly — Thu, 06 Nov 2008 03:59:37 GMT

>Can I debug this useradmin.cgi script using any tools?

Is it perl or a shell script?

Re: unix and cgi scripts

Shibin_2 — Thu, 06 Nov 2008 04:02:44 GMT

Perl

Pls have a look on the attached script.

Re: unix and cgi scripts

Binu George — Fri, 07 Nov 2008 09:15:49 GMT

Shibin,

I notice that the script attached has a blank first line.
CGI scripts should have the interpreter as the first line (in this case #!/opt/perl/bin/perl)

--Binu

Re: unix and cgi scripts

Shibin_2 — Mon, 10 Nov 2008 23:08:11 GMT

Hi Binu,

The perl interpreter is in proper position. There is no problem in that.

Re: unix and cgi scripts

Binu George — Tue, 11 Nov 2008 03:30:24 GMT

Shibin,

One place to look would be the apache error logs (/opt/hpws/apache/logs/error_log on HP-UX).
Any script error and failures are logged in this file. This information should help debug your script.

--Binu

Re: unix and cgi scripts

Shibin_2 — Tue, 11 Nov 2008 15:00:57 GMT

Hi Binu,

There is no error reporting in apache error log. Only notice.

I was checking this for each activity. Unfortunately, no errors reported. Some how the script is not functioning properly.

Thanks

Re: unix and cgi scripts

Binu George — Wed, 12 Nov 2008 03:17:20 GMT

Sibin,

A silly question. Did you restart apache after adding the "ScriptAlias"?
Also, what is the exact message you see on your browser?

--Binu

Re: unix and cgi scripts

Shibin_2 — Sat, 15 Nov 2008 00:21:41 GMT

Yes, I did restart the apache. Unfortunately, nothing is visible in the browser. When I click the action button, neither goes to next page nor try to load the page. So, I cannot determine what is exactly happening. Also, I have created a log file to generate the event, but it only update the time stamps, whenever I clicks. So, there is no hopeful things, I can't get for troubleshooting.

Re: unix and cgi scripts

Shibin_2 — Fri, 05 Dec 2008 03:11:13 GMT

How can I debug this script? Can we debug the UNIX script using external tools ?

Re: unix and cgi scripts

Dennis Handly — Fri, 05 Dec 2008 03:21:22 GMT

>How can I debug this script? Can we debug the UNIX script using external tools?

You can use a perl debugger. You can add prints to the script to see where you are.

Or you could try tusc to see what system calls the script is making. This is useful to see what files are being opened, processes created, etc.