send_or_receive.sh

send_or_receive.sh

#!/bin/bash
#
# Send or receive data to/from another device on the network.


PROGRAM=${0##*/}

LOCAL_IP=192.168.1.100
PORT=6666
PASSWORD=topsecret

if [[ $# -eq 0 ]]; then
    socat "TCP-L:$PORT" - | openssl enc -d -a -aes-256-cbc -iter 100000 -pass pass:$PASSWORD
elif [[ $# -eq 1 && $1 =~ ^(-c|--clipboard)$ ]]; then
    if hash termux-clipboard-set &>/dev/null; then
        CLIPBOARD=termux-clipboard-set
    elif hash xclip &>/dev/null; then
        CLIPBOARD='xclip -sel c'
    elif hash xsel &>/dev/null; then
        CLIPBOARD='xsel -b'
    else
        echo 'ERROR: no clipboard application available' >&2
        exit 1
    fi

    socat "TCP-L:$PORT" "SYSTEM:'openssl enc -d -a -aes-256-cbc -iter 100000 -pass pass:$PASSWORD | $CLIPBOARD'"
elif [[ $# -eq 2 && $1 =~ ^(-s|-send)$ ]]; then
    openssl enc -a -aes-256-cbc -iter 100000 -pass pass:k5JKfpbz3032WHis | socat - "TCP:$2:$PORT"
else
    on=$'\033[1m'
    off=$'\033[0m'
    cat <<EOF
Usage: $PROGRAM [[-c] | -s DEST]
Send or receive data to/from another device on the network.

  -c, --clipboard       store received text on the clipboard
  -s, --send            send data to another device

${on}RECEIVING DATA:${off}

If run without any options, the program will wait to
receive data from the network then print it to stdout.

In order to receive data on this device, the other device
may wish to run a command such as the following:

  echo data | socat - TCP:$LOCAL_IP:$PORT

${on}SENDING DATA:${off}

In order to send data to another device, you must pipe it
into the standard input of this program.

The destination device may wish to use this program to to
receive data or it can run a command such as the following:

  socat TCP-L:$PORT STDOUT

EOF
    exit 0
fi