bashchat

#!/usr/local/bin/bash520
#  BASHCHAT a telnet chat server
#  Copyright 2023 by moshix - All rights reserved. You may not make copies or use any parts of this code
#  Pre-reqs:
#    bashchat (this program)
#    chatserver.py from github.com/moshix/relaychat
#    shellfunc_telnet from github.com/moshix/relaychat
#    tcpserver from ucspi-tcp (brew,apt-get,yum)
#    conv
#    pv
#    stdbuf
#
#  version 0.02  LOGON handling
#  version 0.03  main menu
#  version 0.04  logging all user activity into local file
#  version 0.05  establish link to chatserver.py 
#  version 0.06  use advanced FD and timeout stuff to handle connection forwarding

init() {
HOST="localhost" # host chatserver.py
PORT=9000        # port to chatserver.py
VERSION="1.8"
# terminal handling globals
red=`tput setaf 1`
green=`tput setaf 2`
yellow=`tput setaf 3`
blue=`tput setaf 4`
magenta=`tput setaf 5`
cyan=`tput setaf 6`
white=`tput setaf 7`
blink=`tput blink`
rev=`tput rev`
reset=`tput sgr0`
# echo "${red}red text ${green}green text${reset}"
#
#
source shellfunc_telnet || echo "BASHCHAT039E TELNET ERROR!!!  "
echo "$TCPREMOTEIP:$TCPREMOTEPORT ++ ($$)" >&2

trap 'sf_killchildren || :; echo "$TCPREMOTEIP:$TCPREMOTEPORT -- ($$)" >&2' EXIT

# the password is "test"
testhash="9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08"

sf_tn_init echo  || echo "BASHCHAT201E  Could not initialize with sf_tn_init!!! "

# Setting some gloal variables
bootwait=0.2
diskwait=0.3
currentprompt="#>"

echo -e "\e[1m_\e[0m"
sleep 0.8


clear
echo " ${cyan}" 
echo "    _____ _    _       _______       " && sleep 0.2
echo "   / ____| |  | |   /\|__   __|      "
echo "  | |    | |__| |  /  \  | |         "
echo "  | |    |  __  | / /\ \ | |         " && sleep 0.2
echo "  | |____| |  | |/ ____ \| |         "
echo "   \_____|_|  |_/_/    \_\_|         " && sleep 0.2
echo "${reset}"
echo " " 
#echo  "${red}CHAT ${green}v$VERSION ${red}SERVER BASH VERSION STARTING...${reset}" 
echo " "

echo "THIS ACCEPTABLE USE POLICY (“AUP”) APPLIES TO ALL VISITORS AND USERS OF SERVICES PROVIDED BY BASHCHAT , INCLUDING ALL PERSONS ENTERING THE FACILITY AND USERS OF BASHCHAT  IN CONNECTION WITH THE FACILITY, WHETHER THE PERSON IS A CIVILIAN OR BCHATITARY VISITOR TO THE FACILITY (“USER”). THIS AUP ALSO APPLIES TO ALL VISITOR EQUIPMENT THAT IS UNDER A USER’S CONTROL OR RESIDES IN THE FACILITY OR IS ATTACHED TO BASHCHAT  EQUIPMENT UTILIZED TO PROVIDE SERVICE. THIS AUP IS INCORPORATED BY REFERENCE INTO BASHCHAT GENERAL TERMS AND CONDITIONS FOR DELIVERY OF SERVICE (“T&CS”) AND THE VISITOR ORDER. "
echo " "
echo " "
} #end of init function 


login_user() {
authenticated="no"
if ! sf_tn_read -t 120 -P "Logon: "  command; then
    echo
    exit 0
fi


if ! sf_tn_read -t 120 -P "Password: "  pswd; then
    echo
    exit 0
fi

logconn "$TCPREMOTEIP - login attempt with user: $command"
logconn "$TCPREMOTEIP - login attempt with pwd : $pswd"

if [[ "$command" !=  "chat" ]] || [[ "$pswd" != "chat" ]]; then
    return $authenticated
else 
    authenticated="yes"
fi
}

open_conn() {
# open up link to chatserver.py on port $port
# exec 3<>/dev/tcp/hostname/port
# echo "request" 1>&3
#response="$(cat <&3)"
echo "${yellow}Attempting connection to comm server..${reset}"
sleep 0.2
exec 3<>/dev/tcp/$HOST/$PORT || no_conn
timeout 0.3s cat <&3  #show immediately what's coming back
}

no_conn() {
echo "${red}Cannot establish link to communication server. Exiting...${reset}"
exit 1
}

# main input loop
init         #initialize system
login_user   # ask for userid and pswd


if [[ "$authenticated" = "no" ]]; then
    echo "${red} authentication failed. game over. ${reset}"
    exit 0
fi

open_conn    # open up connection to chatserer.py

while true; do
if ! sf_tn_read -t 120 -P "${white}#"  command; then
    echo
    exit 0
fi
echo "${reset}"

firstsix=`echo $command | head -c 6`
#logconn "$TCPREMOTEIP - $command"

case $command in 



    +QUIT |+quit)
    sleep 0.5
    echo "BCHAT991I TERMINATING SESSIONS NOW"
    logconn "$TCPREMOTEIP User volunterily closing session"
    sleep 1
    echo "/logoff" 1>&3
    exit 0
    ;;
  
     /logoff | /Logoff)
     echo $command 1>&3
     timeout 0.3s cat <&3
     echo "${yellow}Leaving BASHCHAT now. Good bye!${reset}" 
     exit 0
     ;;
 

	+CLS | +cls | +clear | i+CLEAR)
        for i in {1..24}
	do
		echo " "
        done
	;;
 


        *)
        echo $command 1>&3
	    #response="$(cat <&3)" 
	    timeout 0.2s cat <&3
        echo $response
        ;;
esac	

done

while true; do
    sf_tn_read -t 120 line
    if (( $? == 69 )); then # interrupt
        echo "Interrupted!"
    elif (( $? > 128 )); then # timeout
        echo "Too slow!"
    fi

    [[ -n "$line" ]] || break

    echo "Your line: $line"
done

echo "Bye."
echo
sleep 1