# chatroom: Encrypted conversations using ncat

# cat chatroom
#!/bin/bash

basename=`which basename`
cat=`which cat`
nc=`which ncat`
tput=`which tput`

function client {
        $nc --ssl $ip $port > >(while read line; do
                prompt=`echo $line | awk '{print $1}'`
                message=`echo $line | sed "s/$prompt//"`
                if [ "$prompt" == "<user0>" ] || [ "$prompt" == "<announce>" ]; then
                        echo -e "\e[35m<announce>\e[0m\e[90m$message\e[0m"
                else
                        echo -e "\e[32m$prompt\e[0m\e[36m$message\e[0m"
                fi
                $tput setaf 3
        done)
        echo -e "\e[35m<announce>\e[0m \e[90moperator closes the chatroom.\e[0m"
        reset
}

function reset { $tput sgr0; }

function server {
        $nc --listen --chat --ssl $ip $port
}

function usage {
$cat << eof
Usage:
        `$basename $0` [-h] {-m c|s} {-i ip} {-p port}
Options:
        -m: Mode
                c: Client
                s: Server
        -i: IP
        -p: Port
eof
}

conns=''
ip=''
port=''

while getopts "hm:i:p:" option; do
        case $option in
                h)      usage && exit   ;;
                m)      mode=$OPTARG    ;;
                i)      ip=$OPTARG      ;;
                p)      port=$OPTARG    ;;
        esac
done

if [ -z $ip ] || [ -z $port ] ; then
        usage && exit
fi

trap reset SIGINT

case $mode in
        c)      client                  ;;
        s)      server                  ;;
        *)      usage && exit
esac

Server mode

remote# chatroom -m s -i 192.168.1.10 -p 1234

Client mode

local# chatroom -m c -i 192.168.1.10 -p 1234