m-over-reverse-ssh

client-ssh.sh

#!/bin/bash
cleanup() {
  trap - EXIT INT TERM HUP
  rm -f ~/._m_fifo_{i,o}
}
echo CLIENT SSH >&2
mkfifo ~/._m_fifo_{i,o}
trap cleanup EXIT; trap exit INT TERM HUP
{ while cat ~/._m_fifo_o; do :; done; } & cat > ~/._m_fifo_i; wait

client.sh

#!/bin/bash
cleanup() {
  trap - EXIT INT TERM HUP
  kill 0
}
echo CLIENT >&2
trap cleanup EXIT; trap exit INT TERM HUP
{ while cat ~/._m_fifo_i; do :; done; } &
while read -r -p ">>> "; do
  echo "$REPLY" > ~/._m_fifo_o; sleep 0.1
done

server-ssh.sh

#!/bin/bash
cleanup() {
  trap - EXIT INT TERM HUP
  rm -f ~/._m_fifo
}
echo SERVER SSH >&2
mkfifo ~/._m_fifo
trap cleanup EXIT; trap exit INT TERM HUP
run() { "$@"; } # ssh THE_CLIENT "$@"
run ./client-ssh.sh < ~/._m_fifo | ./server.sh > ~/._m_fifo

server.sh

#!/bin/bash
echo SERVER >&2
while read -r; do
  echo "[$REPLY]" >&2
  case "$REPLY" in
    pwd)        echo pwd                    ;;
    "cd "*)     echo cd "${REPLY:3}"        ;;
    ls)         echo m ls -n                ;;
    next)       echo m next                 ;;
    "play "*)   echo m play -- "${REPLY:5}" ;;
    p)          echo xdotool key space      ;;
    quit)       echo xdotool key alt+f4     ;;
    *)          echo unknown command        ;;
  esac
  echo
done