#!/usr/bin/python2.7

# Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.

#

#    Licensed under the Apache License, Version 2.0 (the "License"); you may

#    not use this file except in compliance with the License. You may obtain

#    a copy of the License at

#

#         http://www.apache.org/licenses/LICENSE-2.0

#

#    Unless required by applicable law or agreed to in writing, software

#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

#    License for the specific language governing permissions and limitations

#    under the License.

import os

import re

import sys

import smf_include

from subprocess import CalledProcessError, Popen, PIPE, check_call

def set_hostmodel(value):

    cmd = ["/usr/sbin/ipadm", "show-prop", "-p", "hostmodel",

           "-co", "current", "ipv4"]

    p = Popen(cmd, stdout=PIPE, stderr=PIPE)

    output, error = p.communicate()

    if p.returncode != 0:

        print "failed to retrieve hostmodel ipadm property"

        return False

    if output.strip() == value:

        return True

    cmd = ["/usr/sbin/ipadm", "set-prop", "-t", "-p", "hostmodel=%s" % value,

           "ipv4"]

    p = Popen(cmd, stdout=PIPE, stderr=PIPE)

    output, error = p.communicate()

    if p.returncode != 0:

        print "failed to set ipadm hostmodel property to %s" % value

        return False

    return True

def start():

    # verify paths are valid

    for f in sys.argv[2:4]:

        if not os.path.exists(f) or not os.access(f, os.R_OK):

            print '%s does not exist or is not readable' % f

            return smf_include.SMF_EXIT_ERR_CONFIG

    # set the hostmodel property if necessary

    if not set_hostmodel("src-priority"):

        return smf_include.SMF_EXIT_ERR_FATAL

    cmd = "/usr/lib/neutron/neutron-dhcp-agent --config-file %s " \

        "--config-file %s" % tuple(sys.argv[2:4])

    smf_include.smf_subprocess(cmd)

def stop():

    try:

        # first kill the SMF contract

        check_call(["/usr/bin/pkill", "-c", sys.argv[2]])

    except CalledProcessError as err:

        print "failed to kill the SMF contract: %s" % err

        return smf_include.SMF_EXIT_ERR_FATAL

    cmd = ["/usr/sbin/ipadm", "show-if", "-p", "-o", "ifname"]

    p = Popen(cmd, stdout=PIPE, stderr=PIPE)

    output, error = p.communicate()

    if p.returncode != 0:

        print "failed to retrieve IP interface names"

        return smf_include.SMF_EXIT_ERR_FATAL

    ifnames = output.splitlines()

    # DHCP agent datalinks are always 15 characters in length. They start with

    # 'dh', end with '_0', and in between they are hexadecimal digits.

    prog = re.compile('dh[0-9A-Fa-f\_]{11}_0')

    for ifname in ifnames:

        if not prog.search(ifname):

            continue

        try:

            # first remove the IP

            check_call(["/usr/bin/pfexec", "/usr/sbin/ipadm", "delete-ip",

                        ifname])

            # next remove the VNIC

            check_call(["/usr/bin/pfexec", "/usr/sbin/dladm", "delete-vnic",

                        ifname])

        except CalledProcessError as err:

            print "failed to remove datalinks used by DHCP agent: %s" % err

            return smf_include.SMF_EXIT_ERR_FATAL

    # finally reset the hostmodel property

    if not set_hostmodel("weak"):

        return smf_include.SMF_EXIT_ERR_FATAL

    return smf_include.SMF_EXIT_OK

if __name__ == "__main__":

    os.putenv("LC_ALL", "C")

    smf_include.smf_main()