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Full Discussion: execute shell script using CGI for html site
Special Forums UNIX and Linux Applications execute shell script using CGI for html site Post 302513889 by DGPickett on Thursday 14th of April 2011 09:32:30 AM
Old 04-14-2011
The base shell and web service are not too compatible, both because shell needs help decoding URLencoded strings and because it is easy to open security holes (shell injection, I guess you could call it) with metacharacters in input. You can do some simple things, especially when the user input is not required, like a report with no inputs and no forms, just information or links.

The rules of CGI are pretty simple, and executables in you cgi-bin subtree will get called by the web server. Scripts may not act like they do interactively, since there is no tty. Basicly, you write to stdout a good http header minus the first line, blank line and whatever document you want, then exit 0. Get input is by env var., and post by read-it-yourself from stdin. There are a handful of support variables. You can see them with this cgi script:
Code:
#!/usr/bin/ksh
 
echo "Content-type:text/plain
 
CGI Environment:
'
 
set 
 
echo '
---- END ----'

Last edited by DGPickett; 04-14-2011 at 10:42 AM..
 

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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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