mosh_pc.sh

#!/bin/sh

# ########################################################## #
# wrapper for mosh to work with ssh's proxycommand directive #
# this only makes sense if the machine is directly reachable #
# from the internet using udp.                               #
# ########################################################## #

THISSCRIPT="`basename \"$0\"`"
REMOTE="$1"
REMOTEIP="$2"

debug() {
	echo "[$THISSCRIPT] $@" >&2
}
usage() {
	debug "use me like this: $THISSCRIPT host [ip]"
}

# some default values
if [ -z "$REMOTEIP" ]; then
	if [ -z "$REMOTE" ]; then
		usage
		exit 1
	fi
	# does the remote have a hostname listed in .ssh/config
	REMOTEHOST="`grep -E -C1 \"^Host ([a-zA-Z0-9 ]+ )?$REMOTE( [a-zA-Z0-9 ]+)?$\" ~/.ssh/config | tail -n1 | sed -r 's/\W*Hostname\W+//'`"
	if [ -z "$REMOTEHOST" ]; then REMOTEHOST="$REMOTE"; fi
	# try to resolve hostname
	REMOTEIP="`dig +short $REMOTEHOST`"
	if [ -z "$REMOTEIP" ]; then
		debug "could not resolve hostname $REMOTE"
		exit 1
	fi
fi

debug "starting mosh-server on remote server $REMOTE"
MOSHDATA="`ssh -t \"$REMOTE\" mosh-server new | grep '^MOSH' | tr -d \"\r\n\"`"
if [ -z "$MOSHDATA" ]; then
	debug "mosh-server could not be started"
	exit 1
fi

PORT="`echo -n \"$MOSHDATA\" | cut -s -d' ' -f3`"
MKEY="`echo -n \"$MOSHDATA\" | cut -s -d' ' -f4`"

if [ -z "$PORT" -o -z "$MKEY" ]; then
	debug "got no parseable answer"
	exit 1
fi

debug "starting local mosh-client to $REMOTEIP"
MOSH_KEY="$MKEY" exec mosh-client "$REMOTEIP" "$PORT"