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#!/bin/bash
# Compile server manager for systemtap
#
# Copyright (C) 2008, 2009 Red Hat Inc.
#
# This file is part of systemtap, and is free software. You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
# This script publishes its presence on the network and then listens for
# incoming connections. When a connection is detected, the stap-server script
# is run to handle the request.
# Catch ctrl-c and other termination signals
trap 'terminate' SIGTERM SIGINT
#-----------------------------------------------------------------------------
# Helper functions.
#-----------------------------------------------------------------------------
# function: initialization PORT
function initialization {
# Default settings.
avahi_type=_stap._tcp
# Where are we installed?
exec_prefix=`dirname $0`
exec_prefix=`cd $exec_prefix && pwd`
prefix=`dirname $exec_prefix`
# What port will we listen on?
port=$1
test "X$port" = "X" && port=65000
while netstat -atn | awk '{print $4}' | cut -f2 -d: | egrep -q "^$port\$";
do
# Whoops, the port is busy; try another one.
echo "$0: Port $port is busy"
port=$((1024+($port + $RANDOM)%64000))
done
# Where is the ssl certificate/key database?
ssl_db=$2
if test "X$ssl_db" = "X"; then
# If no certificate/key database has been specified, then find/create
# a local one.
if test $EUID = 0; then
ssl_db=$prefix/etc/systemtap/ssl/server
else
ssl_db=$HOME/.systemtap/ssl/server
fi
if ! test -f $ssl_db/stap-server.cert; then
$exec_prefix/stap-gen-server-cert `dirname $ssl_db` || exit 1
# Now add the server's certificate to the client's database,
# making it a trusted peer. Do this only if the client has been installed.
if test -f $exec_prefix/stap-add-server-cert -a -f $exec_prefix/stap-add-server-cert; then
$exec_prefix/stap-add-server-cert $ssl_db/stap-server.cert `dirname $ssl_db`
fi
fi
fi
nss_pw=$ssl_db/pw
nss_cert=stap-server
}
# function: advertise_presence
#
# Advertise the availability of the server on the network.
function advertise_presence {
# Build up a string representing our server's properties.
# TODO: this needs fleshing out.
local sysinfo=`uname -rvm`
local txt="sysinfo=$sysinfo"
# Call avahi-publish-service to advertise our presence.
avahi-publish-service "Systemtap Compile Server on `uname -n`" \
$avahi_type $port "$txt" > /dev/null 2>&1 &
echo "Systemtap Compile Server on `uname -n` listening on port $port"
}
# function: listen
#
# Listen for and handle requests to the server.
function listen {
# The stap-server-connect program will listen forever
# accepting requests.
$exec_prefix/stap-server-connect -p $port -n $nss_cert -d $ssl_db -w $nss_pw 2>&1 &
wait '%$exec_prefix/stap-server-connect' >/dev/null 2>&1
}
# function: fatal [ MESSAGE ]
#
# Fatal error
# Prints its arguments to stderr and exits
function fatal {
echo "$@" >&2
terminate
exit 1
}
# function: terminate
#
# Terminate gracefully.
function terminate {
echo "$0: Exiting"
# Kill the running 'avahi-publish-service' job
kill -s SIGTERM '%avahi-publish-service' 2> /dev/null
wait '%avahi-publish-service' >/dev/null 2>&1
# Kill any running 'stap-server-connect' job.
kill -s SIGTERM '%$exec_prefix/stap-server-connect' 2> /dev/null
wait '%$exec_prefix/stap-server-connect' >/dev/null 2>&1
exit
}
#-----------------------------------------------------------------------------
# Beginning of main line execution.
#-----------------------------------------------------------------------------
initialization "$@"
advertise_presence
listen
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