netchatte/netchatte.sh

#!/usr/bin/env bash
# usage: chmod all .sh files, be on the same network and run ./netchatte.sh
# todo:
# nicknames
# filesharing


# copyleft, netchatte is a netcat based terminal chat
# program, inspired by 'unnamed project' and made during the first tangible clouds worksession
# 18th → 21st May 2022 in Brussels (https://tangible-cloud.be/)
# 

#init
unset ALLCLIENTS
unset TEMPCLIENTS
unset IP
#define listen port
#define server port....


#functions
mainMenu ()
{
	printf "\n ===== MAIN MENU ===== \n"
	printf "\n"
	echo "Hello, pick an option:"
	printf "\n"
    select mainMenu in "Who is online?" "Chat"
		do
    	#echo $mainMenu
    	case $mainMenu in
    		"Who is online?")
				scan
			;;
			Chat)
				chat
			;;
    	# if [ '1' = "$REPLY" ]; then
    	# 	scan
   		# fi

    	#echo "Selected number: $REPLY"
    	esac
	done
}




scan ()
{
	printf "\n"
	sleep 0
    echo "Searching for friends..."
    sleep 2
    printf "\n"
    #scanOutput=$(arp -a | awk -F'[()]' '{print $2}' | head -1)
    
    # find all machines on the network
	while IFS= read -r LINE; do
  		ALLCLIENTS+=("${LINE}")
  		#REALCLIENTS=( $(nc -zv -G 1 ${LINE} 1234 2>&1  | grep --line-buffered succeeded | awk '{print $3}') )   #see if port of client is open
	done < <(arp -a -x | awk '{print $1}' | tail -n +2) 
	
	
	# for each machine, see if we can connect to it
	for i in "${ALLCLIENTS[@]}"
	do
   	: 
   	TEMPCLIENTS=( $(nc -zv -G 1 $i 1234 2>&1  | grep --line-buffered succeeded | awk '{print $3}'  ))
	


	if [ ${#TEMPCLIENTS[@]} -eq 0 ]; then
    	echo "."
    	#printf "\n"
    	
	else
    	#echo "Found the following clients:"
    	#echo "$i"
    	REALCLIENTS+=("${i}")
	fi


    

	done


	# Iterate over an array to create select menu
	if [ ${#REALCLIENTS[@]} -eq 0 ]; then
		echo "No clients found :("
		printf "\n"
	else
		echo "Found a friend!:"
		printf "\n"
		#echo "${#REALCLIENTS[@]}"
	fi
	select IP in "${REALCLIENTS[@]}" "Back to main menu"; do
  		case ${IP} in
   		 	1*) #limitation: ip must start with a 1....
      			echo "Client ${IP} selected"
      			IP+=("${IP}")
      		# Further processing
      		
      		;;
    		"Back to main menu")
    			printf "\n"
     			mainMenu
      		#break
      		;;
    		*)
      			echo "Not available"
      		;;
  		esac
	done

}


chat ()
{   
   screen -c screenrc #launch split screen session with tx.sh and rx.sh
}

#Main 'loop'
echo "booting...netchatte"
sleep 1
printf "\n"

cat << "EOF"
  ,-.       _,---._ __  / \
 /  )    .-'       `./ /   \
(  (   ,'            `/    /|
 \  `-"             \'\   / |
  `.              ,  \ \ /  |
   /`.          ,'-`----Y   |
  (            ;        |   '
  |  ,-.    ,-'         |  /
  |  | (   |        hjw | /
  )  |  \  `.___________|/
  `--'   `--'
EOF


killall nc &> /dev/null   # clean up (maybe add killall screen..haha dirty)
mainMenu #start main function