how to combine CGI script with a bash script

m4rtin · 02-09-2010, 08:07 AM

I have a fallowing CGI script, which does nothing more than prints out the values user inserted:

Code:

#!/bin/sh
echo "Content-type: text/html"
echo
ID=`echo "$QUERY_STRING" | sed -n 's/^.*id=\([^&]*\).*$/\1/p' | sed "s/%20/ /g"`
TEXT=`echo "$QUERY_STRING" | sed -n 's/^.*text=\([^&]*\).*$/\1/p' | sed "s/%20/ /g"`

echo "<html>"
echo "<head><title>SNMP script</title></head>"
echo "<body>"

if [ $ID ] && [ $TEXT ]
then
  echo "Name is $ID <br>"
  echo "IP address is $TEXT <br>"
else
  echo "<h4>SNMP script</h4>"
  echo "<form method=get>"
  echo "Name: <input type=text name=id><br>"
  echo "IP address: <input type=text name=text><br>"
  echo "<input type=submit value=Generate>"
  echo "</form>"
fi

echo "</body>"
echo "</html>"

If I insert Martin to the name box and 192.168.1.1 to the IP box I get fallowing output:

Quote:

Name is Martin
IP address is 192.168.1.1

As you can see, script above works fine(I host this script in Apache server and use Firefox as a web-client). Now I made a fallowing bash script:

Code:

#!/bin/bash
if (($# < 1))
then
echo "USAGE: $0 IP1 IP2 IP3 IP4 etc"
else
echo Generated by $1
echo
while [ "$2" != "" ]; do
paste <(snmpwalk -v 2c -c public $2 ifdescr | sed 's/.*STRING: //') <(snmpwalk -v 2c -c public $2 ifalias | sed 's/.*STRING: //')
shift
done
fi

...which is started like this: ./script.sh Martin 192.168.1.1. Output is user name plus port numbers and descriptions. This bash script works fine as well

How can I combine those two scripts? I would like to insert name and IP to according boxes in Firefox and after clicking Generate button, user name plus list of port numbers and descriptions will appear in Firefox window instead of terminal emulator window

How to link/combine those two scripts to work together as one?

eyemole80 · 02-09-2010, 08:22 AM

#!/bin/sh
echo "Content-type: text/html"
echo
ID=`echo "$QUERY_STRING" | sed -n 's/^.*id=$[^&]*$.*$/\1/p' | sed "s/%20/ /g"`
TEXT=`echo "$QUERY_STRING" | sed -n 's/^.*text=$[^&]*$.*$/\1/p' | sed "s/%20/ /g"`

echo "<html>"
echo "<head><title>SNMP script</title></head>"
echo "<body>"

if [ $ID ] && [ $TEXT ]
then
echo "Name is $ID <br>"
echo "IP address is $TEXT <br>"
output=`paste <(snmpwalk -v 2c -c public $TEXT ifdescr | sed 's/.*STRING: //') <(snmpwalk -v 2c -c public $TEXT ifalias | sed 's/.*STRING: //')`
echo "$output <br>"
else
echo "<h4>SNMP script</h4>"
echo "<form method=get>"
echo "Name: <input type=text name=id><br>"
echo "IP address: <input type=text name=text><br>"
echo "<input type=submit value=Generate>"
echo "</form>"
fi

echo "</body>"
echo "</html>"

=========================
I think above should work, but I have not checked it. Also in bash cgi , you have to take care of encoding the forms data by yourself. if you are not doing that then a malicious user can exploit it. Be aware.

m4rtin · 02-09-2010, 09:39 AM

eyemole80, thanks! However, this code doesn't quite work because it still just prints out name and IP, but nothing more. And am I correct, that logic behind CGI scripts is that all the bash code(for example loops, snmpwalks, sed and awk parts) parts should be defined as variables in the script(I mean like $TEXT, $ID, $output)?