some description

ychat

#!/bin/bash
#
# ychat
# simple multicast chat tools on the shell (only supported bash)
# copyrights: koki yasuda aka orleika <[email protected]>
# Licensed under MIT
#
# Usage:
#   ychat
#

##############################################################################
# Strict mode
##############################################################################

set -o nounset
set -o errexit
trap 'echo "Aborting due to errexit on line $LINENO. Exit code: $?" >&2' ERR
set -o errtrace
set -o pipefail
IFS=$'
	'

###############################################################################
# Environment
###############################################################################

_ME=$(basename "${0}")

###############################################################################
# Help
###############################################################################

_print_logo() {
  tput clear
  echo -e "\e[1;31m
  ##    ##  ######  ##     ##    ###    ######## 
   ##  ##  ##    ## ##     ##   ## ##      ##    
    ####   ##       ##     ##  ##   ##     ##    
     ##    ##       ######### ##     ##    ##    
     ##    ##       ##     ## #########    ##    
     ##    ##    ## ##     ## ##     ##    ##    
     ##     ######  ##     ## ##     ##    ##    \e[m
  "
}

_print_help() {
  _print_logo

  echo -e "
Usage:
  NAME=[your name] PORT=[udp port] ${_ME} [OPTION]...

Options:
  -h, --help  Show this screen."
}

###############################################################################
# Program Functions
###############################################################################

sender=$(mktemp "/tmp/${0##*/}.tmp.XXXXXX")
receiver=$(mktemp "/tmp/${0##*/}.tmp.XXXXXX")
log=$(mktemp "/tmp/${0##*/}.tmp.XXXXXX")

atexit() {
  [[ -n ${sender-} ]] && rm -f "$sender"
  [[ -n ${receiver-} ]] && { pkill "${0##*/}"; rm -f "$receiver"; }
  [[ -n ${log-} ]] && rm -f "$log"
}
trap atexit EXIT
trap 'trap - EXIT; atexit; exit -1' INT PIPE TERM

_sender() {
  port=$1
  message=$2

  base64 -d <<EOF | gzip -d > "$sender"
H4sICGYW4FoAA3NlbmRlcgDtWG9oW9cVv5IsW0lcW/bSzk0MeQOlUyB+tmTHddp5POdP85yJ4ubP
OmhWRdYfS6ssCel5OF3GWrwOv2peXNiXfRn+1n5ooYwVvBRiZd5mPFjpyli9Px9CaMZT3TJvHSG0
ZNo5751rX91aTWGwD8NHPJ33O+/87jn377vvfu9k5DG3y8W4uNlXGaJCs2ZjjezpL2y6gG2I+eB/
P9vHmgF7BT+NaXW6QkVz7SM/D1xNTkAKrNXpbjJz7RK0l4mi1enu3axOM6Zs8jBX5iez/2KdPkx5
FCSem3hB4gXJn+t5Smxeql8TXd1UbjevF2mlLgq1BcjYLSOB95d3OfjyLq1OB8gvIPGeAF4z+/zC
8+zNZsYHB3qziZ5sJjc13TM9NNgzOKCW8mrYLhurjVU79fh525+3RyfxsR/vg6sVLmy6PdvE8lAZ
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qnPLLo5bn2DfJdj9gn23YO8S7OKcUQR7q2DXZz7wWetYkWehutYRD5p+5VuuHXG3Kqx2sAn+2w9o
cIc4jZTqjRrIwY/3AMYmqr5t438ixiauVmz8PmJsqurrNr6JGJuoumDjPyPGpqnO2/gdxNgk1eds
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d0kYj+9aBP7WeZSDFcm/ScJ4ruIV+BrxNTLoEs8n4S9THTifz/tZMgxRwl7KnfP5/OtlzpznfL6O
VGgh4OsGF7n+DzNnznI+n6enKcF9Ur5uScOngb0GcMzXgTQRFLZ9/lzOUtmb9Sf+LPH5uiO3H6//
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ksTn75kgLdRt98j/EqufP0PEHyL+Mclf7r/nJf7WuayDA5K/HP+KxF8g/gI/571H/J8Qf/NMa/P8
uk415C9IfD/x/Z+T/7LEV4iv+Lf3l/GrzOk7zt86R3fwvDD/RT7P6w0pPj8vXOz47PhcX5X4fN9Q
IX76HvxliR+kc7ogHcrK/S3jVSqL8/m55mHia1IF5P54i+L3SXbOf1qyu7bRHvZpeZH47zbgc/kP
rWCJJCgaAAA=
EOF

  chmod +x "$sender"
  echo "$message" | "$sender" "$port"
}

_receiver() {
  port=$1

  base64 -d <<EOF | gzip -d > "$receiver"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UBi6QXRB7m/QXRQohz63VjU//ipuc6hfrQagnxZ9+GDm79SD3L5sH8UKwy6Mc6E46zFnqldg+s8b
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rq1NAdxbIY97wUOgi2KDDbYG57wuj2voJOjFEuP+KAbXKHY6JB457/9OY7xVm2t6wfu870KD97FW
cX69Z/fsnt2z/zerktXD3PjemO+7+R5aadQcz/eSAfpO5Xtjzetivide87mY74VL9JzvXb9Hnu9Z
28l/VCoP39uXaX/N536FCsrXEb63/hgX+rUafrnBxXwtCJPne2yePywjefQXKb5KmNfLbcLn6fn/
yvg5hGxHqF1Oks+R/wb558n/hPwvyV8hf438G+T/Sv498miHDx7cp3QdPnJij9Kn9qkPKpFwbyS8
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TWAg3U1nTUwbvnBVMzUL/5B1Bp7lkwkzwdTUZDxtJKZS8Un4oF1HTB0380YBMnTdk+OGk3liKjMO
GeZN589N201nrABh4/mpqVTO/O9butZwfGDfW9/zeKld+HmTFO+RMB7nid+2G+dTLlak+AYJ43mD
X9BrpNeIOCbpAhL+LL0D1/N5oETEJBWYnxlxPR+PPcydA7iezytrNDHweYSb/P4PMncMcz0ft+ep
gJ+UyuuVPGylnTmBYz4vXCSBwjYvP7cRSpvr+Ty0THo+D8n1x9//a5Kez2t8ouXzIMZs2UQ/wYQz
UbYxjyuNtXHc5PYfk/RR0keJWK6j5+vHlKTn581BmpjXaj8/1nXcCpKerzsBWkhapXi5/KdZ7fhp
J3076UekeLn9npX0G+e0Lg5J8XL+L0j6EulLpJcnCjn/H7CNs1TH1s+za1xd/UuSPkj64IfU/0zS
K6RXgpvHy/jnrPaMbuNc3cUlYfyLel6uX0n583O/S9s+OH/uL0t6vo8ok372P+gXJH2Uzs+idNgq
t7eMlygtrufnk/tJr0kvILfHNco/LPFcf1LiPZt4H3u//ZD0r9fRc/s3tMkidDgaAAA=
EOF

  chmod +x "$receiver"
  "$receiver" "$port" >> "$log" &
}

_ychat() {
  name=$1
  port=$2 

  _print_logo

  _receiver "$port"
  
  while :
  do
    echo -en "\nsay: "; IFS="" read -r message
    date=$(date '+%H:%M:%S')
    if [[ -n "$message" ]]
    then
      _sender "$port" "$name ($date)> $message"
    fi
    _print_logo
    tail -n15 "$log"
  done
}

###############################################################################
# Main
###############################################################################

ip="[$(hostname -i)]"
name=${NAME:-"$ip"}
port=${PORT:-8900}

_main() {
  if [[ "${1:-}" =~ ^-h|--help$ ]]
  then
    _print_help
  else
    _ychat "$name" "$port"
  fi
}

_main "$@"