wrapper for mosh to work with ssh's proxycommand directive. this only makes sense if the target machine is directly reachable from the internet using udp (but probably not via tcp). usage: mosh_pc.sh [host as mentioned in .ssh/config] [public ip of host]

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"