query in popen Post: 57811

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Hi The following is my program to test popen() routine. The purpose is to print some contents of the corrent directory. But in fact, the output is only one character 'a', which I believe is the first char of the file "a.out". So, can anybody tell me what is wrong about this program?...

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Popen problem

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LEARN ABOUT FREEBSD

upsset.conf

UPSSET.CONF(5)							    NUT Manual							    UPSSET.CONF(5)

NAME

       upsset.conf - Configuration for Network UPS Tools upsset.cgi

DESCRIPTION

       This file only does one job--it lets you convince upsset.cgi(8) that your system's CGI directory is secure. The program will not run until
       this file has been properly defined.

SECURITY REQUIREMENTS

       upsset.cgi(8) allows you to try login name and password combinations. There is no rate limiting, as the program shuts down between every
       request. Such is the nature of CGI programs.

       Normally, attackers would not be able to access your upsd(8) server directly as it would be protected by the LISTEN directives in your
       upsd.conf(5) file, tcp-wrappers (if available when NUT was built), and hopefully local firewall settings in your OS.

       upsset runs on your web server, so upsd will see it as a connection from a host on an internal network. It doesn't know that the connection
       is actually coming from someone on the outside. This is why you must secure it.

       On Apache, you can use the .htaccess file or put the directives in your httpd.conf. It looks something like this, assuming the .htaccess
       method:

	   <Files upsset.cgi>
	   deny from all
	   allow from your.network.addresses
	   </Files>

       You will probably have to set "AllowOverride Limit" for this directory in your server-level configuration file as well.

       If this doesn't make sense, then stop reading and leave this program alone. It's not something you absolutely need to have anyway.

       Assuming you have all this done, and it actually works (test it!), then you may add the following directive to this file:

	   I_HAVE_SECURED_MY_CGI_DIRECTORY

       If you lie to the program and someone beats on your upsd through your web server, don't blame me.

SEE ALSO

       upsset.cgi(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.networkupstools.org/

Network UPS Tools						    05/22/2012							    UPSSET.CONF(5)