spamosh

#!/bin/bash
#
# spasmosh: wrapper around the mosh command for hosts which use single packet authentication
#
# You can protect the ssh server using fwknop, but the mosh UDP port must be forwarded to
# the machine that is running the ssh server you're trying to connect to.
#
# External dependencies:
# - perl
#
# NOTE: for the fwknop command to work, you must first configure it in ~/.fwknoprc

PORT="9000" # must be forwarded on the gateway

# Extract the hostname from an scp destination
hostname="$(echo "${!#}" | perl -pe 's/^([^@]*\@)?(.*)$/$2/')"
remoteip="$(dig +short A "$hostname" | tail -1)"

export http_proxy=""

# shellcheck disable=SC2048,SC2086
fwknop -n "$hostname" || exit 1

key="$(ssh -4 -t "$hostname" mosh-server new -p \"$PORT\" | grep '^MOSH' | cut -s -d' ' -f4 | tr -d '\r')"
MOSH_KEY="$key" exec mosh-client "$remoteip" "$PORT"