netchatte/tx.sh

#!/usr/bin/env bash
LOCALIP=$(ipconfig getifaddr en0)

#setup
foundfriend=0

#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
}


while : ; do
 

unset ALLCLIENTS
unset TEMPCLIENTS
unset REALCLIENTS

printf "\n"
echo "Waiting 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 -ne "."
    #printf "\n"
    
else
    #echo "Found the following clients:"
    #echo "$i"
    REALCLIENTS+=("${i}")
fi

done


#remove own IP from array (breaks the 'no clients found' script below...somehow)
#echo ${LOCALIP}
delete=${LOCALIP}
#echo "localhost:.."
echo "${REALCLIENTS[@]/$delete}"



if [ ${#REALCLIENTS[@]} -eq 0 ]; then
    echo "No clients found :("
    printf "\n"
else
    if [ ${#REALCLIENTS[@]} -ne 0 ] && [ "${REALCLIENTS}" != "${LOCALIP}" ] ; then #remove your own ip, make a list you can choose from here, and add nickname
    echo "Found a friend!:"
   
    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}")
                printf "\n"
                echo "${IP}"
                printf "\n"
                printf "Connecting..."
                printf "\n"
                sleep 1
                printf "Connected! Type your message and press [enter], CTRL+D to quit:"
                printf "\n\n"
                #construct a string to be send to nc...todo
                # read -p 'Please choose a nickname: ' nickname
                # echo -ne "$nickname" # how to prepend a nickname and send it 
                # https://superuser.com/questions/261900/how-can-i-pipe-commands-to-a-netcat-that-will-stay-alive
                nc ${IP} 1234
            
            ;;
            "Back to main menu")
                printf "\n"
                mainMenu
            #break
            ;;
            *)
                echo "Not available"
            ;;
        esac
    done


    break
  fi
  sleep 5
fi
done