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Full Discussion: Wrapping a bash script for CGI
Top Forums Shell Programming and Scripting Wrapping a bash script for CGI Post 38314 by andyj on Friday 11th of July 2003 06:44:14 PM
Old 07-11-2003
Wrapping a bash script for CGI
I hope its ok to start a new thread, I was going to use my existing one but thought a new one would better clarify things and provide better search for future reference.

Well I have my bash program working now, all nice, user input validated, output formatted, everything is looking sexy.

Now the guys tell me that they don't want telnet access to the server, grrrrrrr! I have to make
an idiot proof web interface.

So I need to choose a way to go. As I see it I can either re-write the whole thing in perl or
somehow 'wrap' my bash into a cgi interface.

I've been thinking about the latter option and it seems non-trivial to me at this stage. On the face of it my thinking goes something like this pseudocode:

1) Spawn a copy of my bash script and background it&
while[1] do
2) Take the standard output of the script and redirect it to a little HTML wrapper something like
echo "content-type: text\/html \<html\> <body>
$MYSTDOUTHERE \</html\>\</body\>"
3) process a POST request and send the relevant data to my backgrounded script
done

While I can express the concept clearly enough (I hope) the details are a bit fuzzy and I would welcome any input or comments before getting started. Is such a method possible/reliable/secure?
The web interface would only be used by trusted administrators but I am worried enough about 'command substitution' in any situation where CGIs are involved, its my natural paranoid stance Smilie
all best regards
Andy
 

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LEARN ABOUT DEBIAN

bb-findhost.cgi

BB-FINDHOST.CGI(1)					      General Commands Manual						BB-FINDHOST.CGI(1)

NAME

       bb-findhost.cgi - Xymon CGI script to find hosts

SYNOPSIS

       bb-findhost.cgi?host=REGEX

DESCRIPTION

       bb-findhost.cgi is invoked as a CGI script via the bb-findhost.sh CGI wrapper.

       bb-findhost.cgi is passed a QUERY_STRING environment variable with the "host=REGEX" parameter. The REGEX is a Posix regular expression (see
       regex(7) ) describing the hostnames to look for.  A trailing wildcard is assumed on all hostnames - e.g. requesting the hostname "www" will
       match any host whose name begins with "www".

       It then produces a single web page, listing all of the hosts that matched any of the hostnames, with links to the Xymon webpages where they
       are located.

       The output page lists hosts in the order they appear in the bb-hosts(5) file.

       A sample web page implementing the search facility is included with bbgen, you access it via the URL /bb/help/bb-findhost.html.

OPTIONS

       --env=FILENAME
	      Loads the environment from FILENAME before executing the CGI.

FILES

       $BBHOME/web/findhost_header
	      HTML header file for the generated web page

       $BBHOME/web/findhost_footer
	      HTML footer file for the generated web page

       $BBHOME/web/findhost_form
	      Query form displayed when bb-findhost.cgi is called with no parameters.

ENVIRONMENT VARIABLES

       BBHOSTS
	      bb-findhost.cgi uses the BBHOSTS environment variable to find the bb-hosts file listing all known hosts and their page locations.

       BBHOME Used to locate the template files for the generated web pages.

SEE ALSO

       bbgen(1), bb-hosts(5), hobbitserver.cfg(5)

Xymon							    Version 4.2.3:  4 Feb 2009						BB-FINDHOST.CGI(1)
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