runtime/Stunnel.py
author Edouard Tisserant
Thu, 04 Jun 2020 11:14:21 +0200
branchsvghmi
changeset 2980 2a21d6060d64
parent 2542 a3ec35ee94e7
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: add "unsubscribable" property to widgets in order to generalize what already happens for jump buttons.
In most cases jump buttons do not really subscribe to pointed HMI variable, path is given as a relative page jump path. When widget.unsubscribable is set to true, no subscription is made on page switch, but still offset is updated.
This fixes bug happening on relative jump buttons without "disabled" element where offset did not change on relative page switch.
from __future__ import absolute_import
from __future__ import print_function
import os
from binascii import b2a_hqx
try:
    from runtime.spawn_subprocess import call
except ImportError:
    from subprocess import call

restart_stunnel_cmdline = ["/etc/init.d/S50stunnel", "restart"]

_PSKpath = None


def restartStunnel():
    """
    Restart stunnel service using SysV init stript
    to apply new generated credentials
    """
    try:
        call(restart_stunnel_cmdline)
    except OSError:
        print(_("Couldn't restart stunnel service"))


def PSKgen(ID, PSKpath):

    # b2a_hqx output len is 4/3 input len
    secret = os.urandom(192)  # int(256/1.3333)
    secretstring = b2a_hqx(secret)

    PSKstring = ID+":"+secretstring
    with open(PSKpath, 'w') as f:
        f.write(PSKstring)
    restartStunnel()


def ensurePSK(ID, PSKpath):
    global _PSKpath
    _PSKpath = PSKpath
    # check if already there
    if not os.path.exists(PSKpath):
        # create if needed
        PSKgen(ID, PSKpath)


def getPSKID(errorlog):
    if _PSKpath is not None:
        if not os.path.exists(_PSKpath):
            errorlog(
                'Error: Pre-Shared-Key Secret in %s is missing!\n' % _PSKpath)
            return None
        ID, _sep, PSK = open(_PSKpath).read().partition(':')
        PSK = PSK.rstrip('\n\r')
        return (ID, PSK)
    return None