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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

ipcheck

IPCHECK(8)						  System Administration Utilities						IPCHECK(8)

NAME

       ipcheck - dyndns.org client

DESCRIPTION

       Usage  : ipcheck.py [options] Username Password Hostnames or	  ipcheck.py [options] --acctfile acct_info_file

       Options: -a address     manually specify the address

       -r URL NAT router, use web IP detection

       -A text
	      scan syslog for an IP after text (Unix only)

       -F filename
	      guess the WAN IP from a firewall log

       -b     backup mx option ON (default OFF)

       -c     custom dns option (default dynamic)

       -d dir directory for data files (default current)

       -e script
	      execute script after a successful update

       -f     force update regardless of current state

       -g     NAT router, let dyndns guess your IP (do not use this in a cronjob, try -r)

       -h     print this help text

       --help print all available help text

       -i interface
	      interface for local address (default ppp0)

       -j     disable https

       -l     log debugging text to ipcheck.log file

       --syslog
	      log debugging text to syslog (Unix only)

       -m mxhost
	      mx host (default NOCHG)

       -o     set dyndns offline mode

       -p     proxy bypass on port 8245

       -q     quiet mode (unless there is an error)

       -s     static dns option (default dynamic)

       -t     test run, do not send the update

       -v     verbose mode

       -w     wildcard mode ON (default OFF)

       --makedat
	      create the ipcheck.dat file by dns lookup

       --devices
	      print router options (Linksys, Netgear, etc)

       -n ip  the router IP address on the internal lan

       For  help  with different options: python ipcheck.py -h For supported devices listing  : python ipcheck.py --devices For long detailed help
       text    : python ipcheck.py --help

       Make sure you can write to the current directory for data files and that you always run from the same directory.  The first  time  you  run
       the  script,  you will be asked to run with the --makedat option in addition to any other options.  This will create the data files for the
       hostnames and options your specify on the command line.	You should only do this once.  Subsequent runs should be made without the  --make-
       dat option.

       For  help  with different options: python ipcheck.py -h For supported devices listing  : python ipcheck.py --devices For long detailed help
       text    : python ipcheck.py --help

       Example 1: the external IP is on eth0 of the current machine python ipcheck.py -l -i eth0 username password hostnames

       Example 2: you are using the Linksys routing device python ipcheck.py -l -L linksyspassword username password hostnames

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Debian GNU/Linux						   January 2012 							IPCHECK(8)
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