def get_tunnel_port(keyfile, masterport, masteruser, masterhost):
file = "%s/.pcm_tunnel_port" % os.environ['HOME']
tmptunnelport = None
if os.path.exists(file):
try:
tmptunnelport = int(open(file).read().strip())
except:
pass
tunnelport = None
while not tunnelport:
# Pick a random tunnel port between 20,000-30,000
if tmptunnelport:
tunnelport = tmptunnelport
tmptunnelport = None
else:
tunnelport = 20000 + int(10000*random.random())
print "Testing port %s" % tunnelport
data = check_output(
"ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null %s -p %s %s@%s 'netstat -lnp 2>/dev/null| grep %s'" % (
keyfile,
masterport,
masteruser,
masterhost,
tunnelport
))
if data:
tunnelport = None
#Cache the tunnel, so we reuse the same port and minimze the need
#to log about new tunnels
fd = open(file, 'w')
fd.write(str(tunnelport))
fd.close()
return tunnelport
def get_key():
return check_output("ifconfig | grep HWaddr | md5sum")[:-2]