#!/bin/bash

## Tunnel ssh over an XMPP MUC
##
## Server (system with access to the SSH and XMPP server):
##
##  # ssh-over-xmpp server <conference> <IP address> <port>
##  ssh-over-xmpp server sshxmpp 1.2.3.4 22
##
## Client (system with access to the XMPP server):
##
##  ssh -o ProxyCommand="ssh-over-xmpp client sshxmpp" 127.0.0.1
##

set -o errexit
set -o nounset
set -o pipefail

if [ "$DEBUG" ]; then
set -x
fi

PROGNAME=$0
TMPDIR=$(mktemp -d)
out=$TMPDIR/out

atexit() {
    rm -rf $TMPDIR
}

decode() {
    while read line; do
        OFS=$IFS
        IFS=:
        set -- $line
        [ "$1" = "m" ] && printf '%b' "${!#//%/\\x}"
        IFS=$OFS
    done
}

server() {
    CONNECT=0
    xmppipe -e -r server -o $1 -b 1024 -x < /dev/null | \
    while read line; do
        case $line in
            p*)
                CONNECT=$((CONNECT + 1))
                if [ "$CONNECT" -gt "1" ]; then
                    exec "$PROGNAME" session $@
                fi
                ;;
            *) ;;
        esac
    done > /dev/null
}

session(){
    mkdir -p $TMPDIR
    trap atexit 0

    mkfifo $out

    nc $2 $3 < $out | xmppipe -P 100 -r session -o $1 -x -s | decode > $out
}

client() {
    xmppipe -P 100 -r client -o $1 -x -s | decode
}

$@