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Full Discussion: How to input a number in a web page and pass to a script?
Top Forums Shell Programming and Scripting How to input a number in a web page and pass to a script? Post 302454587 by cfajohnson on Sunday 19th of September 2010 02:25:31 AM
Old 09-19-2010
Quote:
Originally Posted by BobTheBulldog
I am working on an embedded linux router and trying to make a webpage where the user can input a desired number of CPE and have a script update that number on the router. I have a CLI where I can log in and type the following to change that number

echo "20">/proc/net/dbrctl/maxcpe which then sets the MaxCPE at 20

Here is the code for the webpage that I am using to test this
Code:
<B>Set Max CPE</B>
<form method="get" action="cpe.sh">
<select size="3" name=cpe>
<option>5</option>
<option>10</option>
<option>20</option>
<option>32</option>
<option>64</option>
</select>
<input type="submit">
</form>

And here is the script that it is calling
Code:
#!/bin/sh
echo \"$cpe\">/proc/net/dbrctl/maxcpe

It does not work and I am confused as to why or what I need to change.

The information in the form is passed to the script in the variable $QUERY_STRING.

You need to parse that string to extract the variable names and values.

I use this function:
Code:
parse_query() ## probably requires bash
{
    local var val
    local IFS='&'
    unset $*
    vars="&$*&"
    [ "$REQUEST_METHOD" = "POST" ] && read QUERY_STRING
    set -f
    for item in $QUERY_STRING
    do
      var=${item%%=*}
      val=${item#*=}
      val=${val//+/ }
      case $vars in
	  *"&$var&"* )
              case $val in
                  *%[0-9a-fA-F][0-9a-fA-F]*)
                       val=$( printf "%b." "${val//\%/\\x}" )
                       val=${val%.}
              esac
              eval "$var=\$val"
              ;;
      esac
    done
    set +f
}

I call it with the names of the variables I want set, e.g.:

Code:
parse_query cpe

 

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LEARN ABOUT DEBIAN

xorpsh

xorp(1) 						      General Commands Manual							   xorp(1)

NAME

       xorpsh -- XORP Command Shell

SYNOPSIS

       xorpsh [-c command]  [-t directory]  [-e]  [-h]	[-v]

DESCRIPTION

       This manual page documents briefly the xorpsh command.

       This manual page was written for the Debian distribution because the original program does not have a manual page.

       xorpsh  is  the command used to interact with a eXtensible Open Router Platform (XORP) router. This command starts up a command line inter-
       face (CLI), that allows the configuration of the router and monitoring of the router state.

       The xorpsh command provides an interactive command shell to a XORP user, similar in many ways to the role played by a  Unix  shell.   In  a
       production  router  xorpsh might be set up as an user's login shell - they would login to the router via ssh and be directly in the xorpsh.
       It can also be run directly from the Unix command line.

       xorpsh should normally be run as a regular user; it is neither necessary or desirable to run it as root.  If an user is to be permitted	to
       make changes to the running router configuration, that user needs to be in the Unix group xorp.

       The  Debian  package installation automatically sets up both a xorp user and a xorp group to which this user belongs. However, any user can
       run the xorpsh command unless locally restricted by the administrator.

OPTIONS

       xorpsh allows the following options:

       -h	 Show summary of options.

       -v	 Print verbose information.

       -c command
		 Specify command(s) to execute.

       -t directory
		 Specify templates directory.

       -e	 Exit immediately if cannot connect to the rtrmgr

SEE ALSO

       xorp_rtrmgr (8)

       This program is documented fully in the Xorp User Manual, chapter Command Structure, available at /usr/share/doc/xorp-doc/ in  Debian  sys-
       tems when the xorp-doc package is installed.

AUTHOR

       XORP is Copyright (c) 2001-2009 XORP, Inc.

       This  manual  page was written by Javier Fernandez-Sanguino jfs@debian.org for the Debian system (but may be used by others). For licensing
       details please see /usr/share/doc/xorp/copyright.

																	   xorp(1)
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