#!/bin/sh
# This file is part of Epoptes, https://epoptes.org
# Copyright 2017-2018 the Epoptes team, see AUTHORS.
# SPDX-License-Identifier: GPL-3.0-or-later

usage() {
    printf "Usage: $0 host[:port]\n%s" \
'
Share the current terminal with a remote person over a secure connection.
'
}

die() {
    printf "%s\n" "$@" >&2
    exit 1
}

test -n "$1" || die "$(usage)"
command -v socat >/dev/null 2>&1 || die "Please install socat."
command -v screen >/dev/null 2>&1  || die "Please install screen."

case "$1" in
    *:*) host=$1 ;;
    *) host=$1:5499 ;;
esac
printf "Connecting to $host..."

read LINES COLUMNS <<EOF
$(stty size)
EOF
export COLUMNS LINES TERM=xterm
# Try to set the terminal title, to notify that the terminal is shared
printf "\033]0;%s\a" "Shared@$1"

# Connect to the remote person with socat. Then exec screen.
# One second later, attach to screen from the socat process.
socat SYSTEM:"sleep 1; exec screen -xRR ra",pty,stderr openssl-connect:"$host",verify=0 &
exec screen -l -S ra