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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

dacs_prenv

DACS_PRENV(8)						     DACS Web Services Manual						     DACS_PRENV(8)

NAME

       dacs_prenv - CGI program that displays its environment

SYNOPSIS

       dacs_prenv [-html]

DESCRIPTION

       This program is part of the DACS suite. It is a stand-alone program that neither accepts the usual DACS command line options (dacsoptions)
       nor accesses any DACS configuration files.

       This CGI utility simply prints its command line arguments, all environment variables, information about the system on which it is running,
       and CGI parameters and their values. It can be a useful tool when debugging web services.

	   Tip
	   This program can be a useful tool for debugging web services. Replace a call to your web service with an identical call to dacs_prenv
	   to see what arguments your web service is being passed and (to some extent) other context.

OPTIONS

       dacs_prenv recognizes these command line flags:

       -html
	   Selects HTML output (text/html) instead of the default Content-Type of text/plain, by default, using the style sheet dacs_prenv.css[1].

   Web Service Arguments
       When used as a web service, the following parameters are recognized:

       FORMAT
	   At present, the only recognized value for this argument is HTML.

       just_dump_stdin
	   If the value of QUERY_STRING is exactly jump_dump_stdin, then the program will simply copy its standard input to the standard output as
	   text/plain.

FILES

       dacs_prenv.css[1]

DIAGNOSTICS

       The program exits 0 if everything was fine, 1 if an error occurred.

BUGS

       It should be possible to request XML output.

SEE ALSO

       cgiparse(8)[2], env(1)[3], printenv(1)[4], environ(7)[5]

AUTHOR

       Distributed Systems Software (www.dss.ca[6])

COPYING

       Copyright2003-2012 Distributed Systems Software. See the LICENSE[7] file that accompanies the distribution for licensing information.

NOTES

	1. dacs_prenv.css
	   http://dacs.dss.ca/man//css/dacs_prenv.css

	2. cgiparse(8)
	   http://dacs.dss.ca/man/cgiparse.8.html

	3. env(1)
	   http://www.freebsd.org/cgi/man.cgi?query=env&apropos=0&sektion=1&manpath=FreeBSD+9.0-RELEASE&format=html

	4. printenv(1)
	   http://www.freebsd.org/cgi/man.cgi?query=printenv&apropos=0&sektion=1&manpath=FreeBSD+9.0-RELEASE&format=html

	5. environ(7)
	   http://www.freebsd.org/cgi/man.cgi?query=environ&apropos=0&sektion=7&manpath=FreeBSD+9.0-RELEASE&format=html

	6. www.dss.ca
	   http://www.dss.ca

	7. LICENSE
	   http://dacs.dss.ca/man/../misc/LICENSE

DACS 1.4.27b							    10/22/2012							     DACS_PRENV(8)
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