interfaces-wireless.py
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interfaces-wireless.py
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	#!/usr/bin/env python3
	#
	# Copyright (C) 2019 VyOS maintainers and contributors
	#
	# This program is free software; you can redistribute it and/or modify
	# it under the terms of the GNU General Public License version 2 or later as
	# published by the Free Software Foundation.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	import os

	from jinja2 import Template
	from copy import deepcopy
	from sys import exit
	from stat import S_IRWXU,S_IRGRP,S_IXGRP,S_IROTH,S_IXOTH
	from pwd import getpwnam
	from grp import getgrnam

	from subprocess import Popen, PIPE
	from psutil import pid_exists

	from vyos.ifconfig import EthernetIf, VLANIf
	from vyos.configdict import list_diff, vlan_to_dict
	from vyos.config import Config
	from vyos import ConfigError

	user = 'root'
	group = 'vyattacfg'

	# Please be careful if you edit the template.
	config_hostapd_tmpl = """
	### Autogenerated by interfaces-wireless.py ###
	{% if description %}
	# Description: {{ description }}
	# User-friendly description of device; up to 32 octets encoded in UTF-8
	device_name={{ description \| truncate(32, True) }}
	{% endif %}

	# AP netdevice name (without 'ap' postfix, i.e., wlan0 uses wlan0ap for
	# management frames with the Host AP driver); wlan0 with many nl80211 drivers
	# Note: This attribute can be overridden by the values supplied with the '-i'
	# command line parameter.
	interface={{ intf }}

	# Driver interface type (hostap/wired/none/nl80211/bsd);
	# default: hostap). nl80211 is used with all Linux mac80211 drivers.
	# Use driver=none if building hostapd as a standalone RADIUS server that does
	# not control any wireless/wired driver.
	driver=nl80211

	#
	# What about bridge?
	# bridge=br0
	# wds_sta=1
	#

	# Levels (minimum value for logged events):
	# 0 = verbose debugging
	# 1 = debugging
	# 2 = informational messages
	# 3 = notification
	# 4 = warning
	logger_syslog=-1
	logger_syslog_level=0
	logger_stdout=-1
	logger_stdout_level=0

	{%- if country_code %}

	# Country code (ISO/IEC 3166-1). Used to set regulatory domain.
	# Set as needed to indicate country in which device is operating.
	# This can limit available channels and transmit power.
	country_code={{ country_code }}

	# Enable IEEE 802.11d. This advertises the country_code and the set of allowed
	# channels and transmit power levels based on the regulatory limits. The
	# country_code setting must be configured with the correct country for
	# IEEE 802.11d functions.
	ieee80211d=1
	{% endif %}

	{%- if ssid %}

	# SSID to be used in IEEE 802.11 management frames
	ssid={{ ssid }}
	{% endif %}

	{%- if channel %}

	# Channel number (IEEE 802.11)
	# (default: 0, i.e., not set)
	# Please note that some drivers do not use this value from hostapd and the
	# channel will need to be configured separately with iwconfig.
	#
	# If CONFIG_ACS build option is enabled, the channel can be selected
	# automatically at run time by setting channel=acs_survey or channel=0, both of
	# which will enable the ACS survey based algorithm.
	channel={{ channel }}
	{% endif %}

	{%- if mode %}

	# Operation mode (a = IEEE 802.11a (5 GHz), b = IEEE 802.11b (2.4 GHz),
	# g = IEEE 802.11g (2.4 GHz), ad = IEEE 802.11ad (60 GHz); a/g options are used
	# with IEEE 802.11n (HT), too, to specify band). For IEEE 802.11ac (VHT), this
	# needs to be set to hw_mode=a. For IEEE 802.11ax (HE) on 6 GHz this needs
	# to be set to hw_mode=a. When using ACS (see channel parameter), a
	# special value "any" can be used to indicate that any support band can be used.
	# This special case is currently supported only with drivers with which
	# offloaded ACS is used.
	{% if 'n' in mode -%}
	hw_mode=g
	ieee80211n=1
	{% elif 'ac' in mode -%}
	hw_mode=a
	ieee80211h=1
	ieee80211ac=1
	{% else -%}
	hw_mode={{ mode }}
	{% endif %}
	{% endif %}

	# ieee80211w: Whether management frame protection (MFP) is enabled
	# 0 = disabled (default)
	# 1 = optional
	# 2 = required
	{% if 'disabled' in mgmt_frame_protection -%}
	ieee80211w=0
	{% elif 'optional' in mgmt_frame_protection -%}
	ieee80211w=1
	{% elif 'required' in mgmt_frame_protection -%}
	ieee80211w=2
	{% endif %}

	# ht_capab: HT capabilities (list of flags)
	# LDPC coding capability: [LDPC] = supported
	# Supported channel width set: [HT40-] = both 20 MHz and 40 MHz with secondary
	# channel below the primary channel; [HT40+] = both 20 MHz and 40 MHz
	# with secondary channel above the primary channel
	# (20 MHz only if neither is set)
	# Note: There are limits on which channels can be used with HT40- and
	# HT40+. Following table shows the channels that may be available for
	# HT40- and HT40+ use per IEEE 802.11n Annex J:
	# freq HT40- HT40+
	# 2.4 GHz 5-13 1-7 (1-9 in Europe/Japan)
	# 5 GHz 40,48,56,64 36,44,52,60
	# (depending on the location, not all of these channels may be available
	# for use)
	# Please note that 40 MHz channels may switch their primary and secondary
	# channels if needed or creation of 40 MHz channel maybe rejected based
	# on overlapping BSSes. These changes are done automatically when hostapd
	# is setting up the 40 MHz channel.
	# Spatial Multiplexing (SM) Power Save: [SMPS-STATIC] or [SMPS-DYNAMIC]
	# (SMPS disabled if neither is set)
	# HT-greenfield: [GF] (disabled if not set)
	# Short GI for 20 MHz: [SHORT-GI-20] (disabled if not set)
	# Short GI for 40 MHz: [SHORT-GI-40] (disabled if not set)
	# Tx STBC: [TX-STBC] (disabled if not set)
	# Rx STBC: [RX-STBC1] (one spatial stream), [RX-STBC12] (one or two spatial
	# streams), or [RX-STBC123] (one, two, or three spatial streams); Rx STBC
	# disabled if none of these set
	# HT-delayed Block Ack: [DELAYED-BA] (disabled if not set)
	# Maximum A-MSDU length: [MAX-AMSDU-7935] for 7935 octets (3839 octets if not
	# set)
	# DSSS/CCK Mode in 40 MHz: [DSSS_CCK-40] = allowed (not allowed if not set)
	# 40 MHz intolerant [40-INTOLERANT] (not advertised if not set)
	# L-SIG TXOP protection support: [LSIG-TXOP-PROT] (disabled if not set)
	{% if cap_ht %}
	ht_capab=
	{%- endif -%}

	{%- if cap_ht_40mhz_incapable -%}
	[40-INTOLERANT]
	{%- endif -%}

	{%- if cap_ht_delayed_block_ack -%}
	[DELAYED-BA]
	{%- endif -%}

	{%- if cap_ht_dsss_cck_40 -%}
	[DSSS_CCK-40]
	{%- endif -%}

	{%- if cap_ht_greenfield -%}
	[GF]
	{%- endif -%}

	{%- if cap_ht_ldpc -%}
	[LDPC]
	{%- endif -%}

	{%- if cap_ht_lsig_protection -%}
	[LSIG-TXOP-PROT]
	{%- endif -%}

	{%- if cap_ht_max_amsdu -%}
	[MAX-AMSDU-{{ cap_ht_max_amsdu }}]
	{%- endif -%}

	{%- if cap_ht_smps -%}
	[SMPS-{{ cap_ht_smps \| upper }}]
	{%- endif -%}

	{%- if cap_ht_chan_set_width -%}
	{%- for csw in cap_ht_chan_set_width -%}
	[{{ csw \| upper }}]
	{%- endfor -%}
	{%- endif -%}

	{%- if cap_ht_short_gi -%}
	{%- for gi in cap_ht_short_gi -%}
	[SHORT-GI-{{ gi }}]
	{%- endfor -%}
	{%- endif -%}

	{%- if cap_ht_stbc_tx -%}
	[TX-STBC]
	{%- endif -%}
	{%- if cap_ht_stbc_rx -%}
	[RX-STBC{{ cap_ht_stbc_rx }}]
	{%- endif %}

	# Required for full HT and VHT functionality
	wme_enabled=1

	{% if cap_ht_powersave -%}
	# WMM-PS Unscheduled Automatic Power Save Delivery [U-APSD]
	# Enable this flag if U-APSD supported outside hostapd (eg., Firmware/driver)
	uapsd_advertisement_enabled=1
	{%- endif %}

	{% if cap_req_ht -%}
	# Require stations to support HT PHY (reject association if they do not)
	require_ht=1
	{% endif %}

	# vht_capab: VHT capabilities (list of flags)
	#
	# vht_max_mpdu_len: [MAX-MPDU-7991] [MAX-MPDU-11454]
	# Indicates maximum MPDU length
	# 0 = 3895 octets (default)
	# 1 = 7991 octets
	# 2 = 11454 octets
	# 3 = reserved
	#
	# supported_chan_width: [VHT160] [VHT160-80PLUS80]
	# Indicates supported Channel widths
	# 0 = 160 MHz & 80+80 channel widths are not supported (default)
	# 1 = 160 MHz channel width is supported
	# 2 = 160 MHz & 80+80 channel widths are supported
	# 3 = reserved
	#
	# Rx LDPC coding capability: [RXLDPC]
	# Indicates support for receiving LDPC coded pkts
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# Short GI for 80 MHz: [SHORT-GI-80]
	# Indicates short GI support for reception of packets transmitted with TXVECTOR
	# params format equal to VHT and CBW = 80Mhz
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# Short GI for 160 MHz: [SHORT-GI-160]
	# Indicates short GI support for reception of packets transmitted with TXVECTOR
	# params format equal to VHT and CBW = 160Mhz
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# Tx STBC: [TX-STBC-2BY1]
	# Indicates support for the transmission of at least 2x1 STBC
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# Rx STBC: [RX-STBC-1] [RX-STBC-12] [RX-STBC-123] [RX-STBC-1234]
	# Indicates support for the reception of PPDUs using STBC
	# 0 = Not supported (default)
	# 1 = support of one spatial stream
	# 2 = support of one and two spatial streams
	# 3 = support of one, two and three spatial streams
	# 4 = support of one, two, three and four spatial streams
	# 5,6,7 = reserved
	#
	# SU Beamformer Capable: [SU-BEAMFORMER]
	# Indicates support for operation as a single user beamformer
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# SU Beamformee Capable: [SU-BEAMFORMEE]
	# Indicates support for operation as a single user beamformee
	# 0 = Not supported (default)
	# 1 = Supported
	#
	# Compressed Steering Number of Beamformer Antennas Supported:
	# [BF-ANTENNA-2] [BF-ANTENNA-3] [BF-ANTENNA-4]
	# Beamformee's capability indicating the maximum number of beamformer
	# antennas the beamformee can support when sending compressed beamforming
	# feedback
	# If SU beamformer capable, set to maximum value minus 1
	# else reserved (default)
	#
	# Number of Sounding Dimensions:
	# [SOUNDING-DIMENSION-2] [SOUNDING-DIMENSION-3] [SOUNDING-DIMENSION-4]
	# Beamformer's capability indicating the maximum value of the NUM_STS parameter
	# in the TXVECTOR of a VHT NDP
	# If SU beamformer capable, set to maximum value minus 1
	# else reserved (default)
	#
	# MU Beamformer Capable: [MU-BEAMFORMER]
	# Indicates support for operation as an MU beamformer
	# 0 = Not supported or sent by Non-AP STA (default)
	# 1 = Supported
	#
	# VHT TXOP PS: [VHT-TXOP-PS]
	# Indicates whether or not the AP supports VHT TXOP Power Save Mode
	# or whether or not the STA is in VHT TXOP Power Save mode
	# 0 = VHT AP doesn't support VHT TXOP PS mode (OR) VHT STA not in VHT TXOP PS
	# mode
	# 1 = VHT AP supports VHT TXOP PS mode (OR) VHT STA is in VHT TXOP power save
	# mode
	#
	# +HTC-VHT Capable: [HTC-VHT]
	# Indicates whether or not the STA supports receiving a VHT variant HT Control
	# field.
	# 0 = Not supported (default)
	# 1 = supported
	#
	# Maximum A-MPDU Length Exponent: [MAX-A-MPDU-LEN-EXP0]..[MAX-A-MPDU-LEN-EXP7]
	# Indicates the maximum length of A-MPDU pre-EOF padding that the STA can recv
	# This field is an integer in the range of 0 to 7.
	# The length defined by this field is equal to
	# 2 pow(13 + Maximum A-MPDU Length Exponent) -1 octets
	#
	# VHT Link Adaptation Capable: [VHT-LINK-ADAPT2] [VHT-LINK-ADAPT3]
	# Indicates whether or not the STA supports link adaptation using VHT variant
	# HT Control field
	# If +HTC-VHTcapable is 1
	# 0 = (no feedback) if the STA does not provide VHT MFB (default)
	# 1 = reserved
	# 2 = (Unsolicited) if the STA provides only unsolicited VHT MFB
	# 3 = (Both) if the STA can provide VHT MFB in response to VHT MRQ and if the
	# STA provides unsolicited VHT MFB
	# Reserved if +HTC-VHTcapable is 0
	#
	# Rx Antenna Pattern Consistency: [RX-ANTENNA-PATTERN]
	# Indicates the possibility of Rx antenna pattern change
	# 0 = Rx antenna pattern might change during the lifetime of an association
	# 1 = Rx antenna pattern does not change during the lifetime of an association
	#
	# Tx Antenna Pattern Consistency: [TX-ANTENNA-PATTERN]
	# Indicates the possibility of Tx antenna pattern change
	# 0 = Tx antenna pattern might change during the lifetime of an association
	# 1 = Tx antenna pattern does not change during the lifetime of an association
	{% if cap_vht %}
	vht_capab=
	{%- endif -%}

	{%- if cap_vht_max_mpdu -%}
	[MAX-MPDU-{{ cap_vht_max_mpdu }}]
	{%- endif -%}

	{%- if cap_vht_max_mpdu_exp -%}
	[MAX-A-MPDU-LEN-EXP{{ cap_vht_max_mpdu_exp }}]
	{%- endif -%}

	{%- if cap_vht_chan_set_width -%}
	[MAX-A-MPDU-LEN-EXP{{ cap_vht_max_mpdu_exp }}]
	{%- endif -%}

	{%- if cap_vht_chan_set_width -%}
	{%- if '2' in cap_vht_chan_set_width -%}
	[VHT160]
	{%- elif '3' in cap_vht_chan_set_width -%}
	[VHT160-80PLUS80]
	{%- endif -%}
	{%- endif -%}

	{%- if cap_vht_stbc_tx -%}
	[TX-STBC-2BY1]
	{%- endif -%}

	{%- if cap_vht_stbc_rx -%}
	[RX-STBC-{{ cap_vht_stbc_rx }}]
	{%- endif -%}

	{%- if cap_vht_link_adaptation -%}
	{%- if 'unsolicited' in cap_vht_link_adaptation -%}
	[VHT-LINK-ADAPT2]
	{%- elif 'both' in cap_vht_link_adaptation -%}
	[VHT-LINK-ADAPT3]
	{%- endif -%}
	{%- endif -%}

	{%- if cap_vht_short_gi -%}
	{%- for gi in cap_vht_short_gi -%}
	[SHORT-GI-{{ gi }}]
	{%- endfor -%}
	{%- endif -%}

	{%- if cap_vht_ldpc -%}
	[RXLDPC]
	{%- endif -%}

	{%- if cap_vht_tx_powersave -%}
	[VHT-TXOP-PS]
	{%- endif -%}

	{%- if cap_vht_vht_cf -%}
	[HTC-VHT]
	{%- endif -%}

	{%- if cap_vht_beamform -%}
	{%- for beamform in cap_vht_beamform -%}
	{%- if 'single-user-beamformer' in beamform -%}
	[SU-BEAMFORMER]
	{%- elif 'single-user-beamformee' in beamform -%}
	[SU-BEAMFORMEE]
	{%- elif 'multi-user-beamformer' in beamform -%}
	[MU-BEAMFORMER]
	{%- elif 'multi-user-beamformee' in beamform -%}
	[MU-BEAMFORMEE]
	{%- endif -%}
	{%- endfor -%}
	{%- endif -%}

	{%- if cap_vht_antenna_fixed -%}
	[RX-ANTENNA-PATTERN][TX-ANTENNA-PATTERN]
	{%- endif -%}

	{%- if cap_vht_antenna_cnt -%}
	{%- for beamform in cap_vht_beamform -%}
	{%- if 'single-user-beamformer' in beamform -%}
	[BF-ANTENNA-{{ cap_vht_antenna_cnt\|int -1 }}][SOUNDING-DIMENSION-{{ cap_vht_antenna_cnt\|int -1}}]
	{%- else -%}
	[BF-ANTENNA-{{ cap_vht_antenna_cnt }}][SOUNDING-DIMENSION-{{ cap_vht_antenna_cnt }}]
	{%- endif -%}
	{%- endfor -%}
	{%- endif %}

	# ieee80211n: Whether IEEE 802.11n (HT) is enabled
	# 0 = disabled (default)
	# 1 = enabled
	# Note: You will also need to enable WMM for full HT functionality.
	# Note: hw_mode=g (2.4 GHz) and hw_mode=a (5 GHz) is used to specify the band.
	{% if cap_req_vht -%}
	ieee80211n=0
	# Require stations to support VHT PHY (reject association if they do not)
	require_vht=1
	{% endif %}

	{% if cap_vht_center_freq_1 -%}
	# center freq = 5 GHz + (5 * index)
	# So index 42 gives center freq 5.210 GHz
	# which is channel 42 in 5G band
	vht_oper_centr_freq_seg0_idx={{ cap_vht_center_freq_1 }}
	{% endif %}

	{% if cap_vht_center_freq_2 -%}
	# center freq = 5 GHz + (5 * index)
	# So index 159 gives center freq 5.795 GHz
	# which is channel 159 in 5G band
	vht_oper_centr_freq_seg1_idx={{ cap_vht_center_freq_2 }}
	{% endif %}

	{% if disable_broadcast_ssid -%}
	# Send empty SSID in beacons and ignore probe request frames that do not
	# specify full SSID, i.e., require stations to know SSID.
	# default: disabled (0)
	# 1 = send empty (length=0) SSID in beacon and ignore probe request for
	# broadcast SSID
	# 2 = clear SSID (ASCII 0), but keep the original length (this may be required
	# with some clients that do not support empty SSID) and ignore probe
	# requests for broadcast SSID
	ignore_broadcast_ssid=1
	{% endif %}

	# Station MAC address -based authentication
	# Please note that this kind of access control requires a driver that uses
	# hostapd to take care of management frame processing and as such, this can be
	# used with driver=hostap or driver=nl80211, but not with driver=atheros.
	# 0 = accept unless in deny list
	# 1 = deny unless in accept list
	# 2 = use external RADIUS server (accept/deny lists are searched first)
	macaddr_acl=0

	{% if max_stations -%}
	# Maximum number of stations allowed in station table. New stations will be
	# rejected after the station table is full. IEEE 802.11 has a limit of 2007
	# different association IDs, so this number should not be larger than that.
	# (default: 2007)
	max_num_sta={{ max_stations }}
	{% endif %}

	{% if isolate_stations -%}
	# Client isolation can be used to prevent low-level bridging of frames between
	# associated stations in the BSS. By default, this bridging is allowed.
	ap_isolate=1
	{% endif %}

	{% if reduce_transmit_power -%}
	# Add Power Constraint element to Beacon and Probe Response frames
	# This config option adds Power Constraint element when applicable and Country
	# element is added. Power Constraint element is required by Transmit Power
	# Control. This can be used only with ieee80211d=1.
	# Valid values are 0..255.
	local_pwr_constraint={{ reduce_transmit_power }}
	{% endif %}

	{% if expunge_failing_stations -%}
	# Disassociate stations based on excessive transmission failures or other
	# indications of connection loss. This depends on the driver capabilities and
	# may not be available with all drivers.
	disassoc_low_ack=1
	{% endif %}

	{% if sec_wep -%}
	# IEEE 802.11 specifies two authentication algorithms. hostapd can be
	# configured to allow both of these or only one. Open system authentication
	# should be used with IEEE 802.1X.
	# Bit fields of allowed authentication algorithms:
	# bit 0 = Open System Authentication
	# bit 1 = Shared Key Authentication (requires WEP)
	auth_algs=2

	# WEP rekeying (disabled if key lengths are not set or are set to 0)
	# Key lengths for default/broadcast and individual/unicast keys:
	# 5 = 40-bit WEP (also known as 64-bit WEP with 40 secret bits)
	# 13 = 104-bit WEP (also known as 128-bit WEP with 104 secret bits)
	wep_key_len_broadcast=5
	wep_key_len_unicast=5

	# Static WEP key configuration
	#
	# The key number to use when transmitting.
	# It must be between 0 and 3, and the corresponding key must be set.
	# default: not set
	wep_default_key=0

	# The WEP keys to use.
	# A key may be a quoted string or unquoted hexadecimal digits.
	# The key length should be 5, 13, or 16 characters, or 10, 26, or 32
	# digits, depending on whether 40-bit (64-bit), 104-bit (128-bit), or
	# 128-bit (152-bit) WEP is used.
	# Only the default key must be supplied; the others are optional.
	{% if sec_wep_key -%}
	{% for key in sec_wep_key -%}
	wep_key{{ loop.index -1 }}={{ key}}
	{% endfor %}
	{%- endif %}

	{% elif sec_wpa -%}
	##### WPA/IEEE 802.11i configuration ##########################################

	# Enable WPA. Setting this variable configures the AP to require WPA (either
	# WPA-PSK or WPA-RADIUS/EAP based on other configuration). For WPA-PSK, either
	# wpa_psk or wpa_passphrase must be set and wpa_key_mgmt must include WPA-PSK.
	# Instead of wpa_psk / wpa_passphrase, wpa_psk_radius might suffice.
	# For WPA-RADIUS/EAP, ieee8021x must be set (but without dynamic WEP keys),
	# RADIUS authentication server must be configured, and WPA-EAP must be included
	# in wpa_key_mgmt.
	# This field is a bit field that can be used to enable WPA (IEEE 802.11i/D3.0)
	# and/or WPA2 (full IEEE 802.11i/RSN):
	# bit0 = WPA
	# bit1 = IEEE 802.11i/RSN (WPA2) (dot11RSNAEnabled)
	{% if 'both' in sec_wpa_mode -%}
	wpa=3
	{%- elif 'wpa2' in sec_wpa_mode -%}
	wpa=2
	{%- elif 'wpa' in sec_wpa_mode -%}
	wpa=1
	{%- endif %}

	{% if sec_wpa_cipher -%}
	# Set of accepted cipher suites (encryption algorithms) for pairwise keys
	# (unicast packets). This is a space separated list of algorithms:
	# CCMP = AES in Counter mode with CBC-MAC (CCMP-128)
	# TKIP = Temporal Key Integrity Protocol
	# CCMP-256 = AES in Counter mode with CBC-MAC with 256-bit key
	# GCMP = Galois/counter mode protocol (GCMP-128)
	# GCMP-256 = Galois/counter mode protocol with 256-bit key
	# Group cipher suite (encryption algorithm for broadcast and multicast frames)
	# is automatically selected based on this configuration. If only CCMP is
	# allowed as the pairwise cipher, group cipher will also be CCMP. Otherwise,
	# TKIP will be used as the group cipher. The optional group_cipher parameter can
	# be used to override this automatic selection.
	{% if 'wpa2' in sec_wpa_mode -%}
	# Pairwise cipher for RSN/WPA2 (default: use wpa_pairwise value)
	rsn_pairwise={{ sec_wpa_cipher \| join(" ") }}
	{% else -%}
	# Pairwise cipher for WPA (v1) (default: TKIP)
	wpa_pairwise={{ sec_wpa_cipher \| join(" ") }}
	{%- endif -%}
	{% endif %}

	{% if sec_wpa_passphrase -%}
	# IEEE 802.11 specifies two authentication algorithms. hostapd can be
	# configured to allow both of these or only one. Open system authentication
	# should be used with IEEE 802.1X.
	# Bit fields of allowed authentication algorithms:
	# bit 0 = Open System Authentication
	# bit 1 = Shared Key Authentication (requires WEP)
	auth_algs=1

	# WPA pre-shared keys for WPA-PSK. This can be either entered as a 256-bit
	# secret in hex format (64 hex digits), wpa_psk, or as an ASCII passphrase
	# (8..63 characters) that will be converted to PSK. This conversion uses SSID
	# so the PSK changes when ASCII passphrase is used and the SSID is changed.
	wpa_passphrase={{ sec_wpa_passphrase }}

	# Set of accepted key management algorithms (WPA-PSK, WPA-EAP, or both). The
	# entries are separated with a space. WPA-PSK-SHA256 and WPA-EAP-SHA256 can be
	# added to enable SHA256-based stronger algorithms.
	# WPA-PSK = WPA-Personal / WPA2-Personal
	# WPA-PSK-SHA256 = WPA2-Personal using SHA256
	wpa_key_mgmt=WPA-PSK

	{% elif sec_wpa_radius -%}
	##### IEEE 802.1X-2004 related configuration ##################################
	# Require IEEE 802.1X authorization
	ieee8021x=1

	# Set of accepted key management algorithms (WPA-PSK, WPA-EAP, or both). The
	# entries are separated with a space. WPA-PSK-SHA256 and WPA-EAP-SHA256 can be
	# added to enable SHA256-based stronger algorithms.
	# WPA-EAP = WPA-Enterprise / WPA2-Enterprise
	# WPA-EAP-SHA256 = WPA2-Enterprise using SHA256
	wpa_key_mgmt=WPA-EAP

	{% for radius in sec_wpa_radius -%}
	auth_server_addr={{ radius.server }}
	auth_server_port={{ radius.port }}
	auth_server_shared_secret={{ radius.secret }}
	{% if radius.accounting -%}
	acct_server_addr={{ radius.server }}
	acct_server_port={{ radius.acc_port }}
	acct_server_shared_secret={{ radius.secret }}
	{% endif %}
	{% endfor %}

	{% endif %}

	{% else %}
	# Open system
	auth_algs=1
	{% endif %}

	# TX queue parameters (EDCF / bursting)
	# tx_queue_<queue name>_<param>
	# queues: data0, data1, data2, data3
	# (data0 is the highest priority queue)
	# parameters:
	# aifs: AIFS (default 2)
	# cwmin: cwMin (1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191,
	# 16383, 32767)
	# cwmax: cwMax (same values as cwMin, cwMax >= cwMin)
	# burst: maximum length (in milliseconds with precision of up to 0.1 ms) for
	# bursting
	#
	# Default WMM parameters (IEEE 802.11 draft; 11-03-0504-03-000e):
	# These parameters are used by the access point when transmitting frames
	# to the clients.
	#
	# Low priority / AC_BK = background
	tx_queue_data3_aifs=7
	tx_queue_data3_cwmin=15
	tx_queue_data3_cwmax=1023
	tx_queue_data3_burst=0
	# Note: for IEEE 802.11b mode: cWmin=31 cWmax=1023 burst=0
	#
	# Normal priority / AC_BE = best effort
	tx_queue_data2_aifs=3
	tx_queue_data2_cwmin=15
	tx_queue_data2_cwmax=63
	tx_queue_data2_burst=0
	# Note: for IEEE 802.11b mode: cWmin=31 cWmax=127 burst=0
	#
	# High priority / AC_VI = video
	tx_queue_data1_aifs=1
	tx_queue_data1_cwmin=7
	tx_queue_data1_cwmax=15
	tx_queue_data1_burst=3.0
	# Note: for IEEE 802.11b mode: cWmin=15 cWmax=31 burst=6.0
	#
	# Highest priority / AC_VO = voice
	tx_queue_data0_aifs=1
	tx_queue_data0_cwmin=3
	tx_queue_data0_cwmax=7
	tx_queue_data0_burst=1.5

	# Default WMM parameters (IEEE 802.11 draft; 11-03-0504-03-000e):
	# for 802.11a or 802.11g networks
	# These parameters are sent to WMM clients when they associate.
	# The parameters will be used by WMM clients for frames transmitted to the
	# access point.
	#
	# note - txop_limit is in units of 32microseconds
	# note - acm is admission control mandatory flag. 0 = admission control not
	# required, 1 = mandatory
	# note - Here cwMin and cmMax are in exponent form. The actual cw value used
	# will be (2^n)-1 where n is the value given here. The allowed range for these
	# wmm_ac_??_{cwmin,cwmax} is 0..15 with cwmax >= cwmin.
	#
	wmm_enabled=1

	# Low priority / AC_BK = background
	wmm_ac_bk_cwmin=4
	wmm_ac_bk_cwmax=10
	wmm_ac_bk_aifs=7
	wmm_ac_bk_txop_limit=0
	wmm_ac_bk_acm=0
	# Note: for IEEE 802.11b mode: cWmin=5 cWmax=10
	#
	# Normal priority / AC_BE = best effort
	wmm_ac_be_aifs=3
	wmm_ac_be_cwmin=4
	wmm_ac_be_cwmax=10
	wmm_ac_be_txop_limit=0
	wmm_ac_be_acm=0
	# Note: for IEEE 802.11b mode: cWmin=5 cWmax=7
	#
	# High priority / AC_VI = video
	wmm_ac_vi_aifs=2
	wmm_ac_vi_cwmin=3
	wmm_ac_vi_cwmax=4
	wmm_ac_vi_txop_limit=94
	wmm_ac_vi_acm=0
	# Note: for IEEE 802.11b mode: cWmin=4 cWmax=5 txop_limit=188
	#
	# Highest priority / AC_VO = voice
	wmm_ac_vo_aifs=2
	wmm_ac_vo_cwmin=2
	wmm_ac_vo_cwmax=3
	wmm_ac_vo_txop_limit=47
	wmm_ac_vo_acm=0

	"""

	default_config_data = {
	'address': [],
	'address_remove': [],
	'cap_ht' : False,
	'cap_ht_40mhz_incapable' : False,
	'cap_ht_powersave' : False,
	'cap_ht_chan_set_width' : '',
	'cap_ht_delayed_block_ack' : False,
	'cap_ht_dsss_cck_40' : False,
	'cap_ht_greenfield' : False,
	'cap_ht_ldpc' : False,
	'cap_ht_lsig_protection' : False,
	'cap_ht_max_amsdu' : '',
	'cap_ht_short_gi' : [],
	'cap_ht_smps' : '',
	'cap_ht_stbc_rx' : '',
	'cap_ht_stbc_tx' : False,
	'cap_req_ht' : False,
	'cap_req_vht' : False,
	'cap_vht' : False,
	'cap_vht_antenna_cnt' : '',
	'cap_vht_antenna_fixed' : False,
	'cap_vht_beamform' : '',
	'cap_vht_center_freq_1' : '',
	'cap_vht_center_freq_2' : '',
	'cap_vht_chan_set_width' : '',
	'cap_vht_ldpc' : False,
	'cap_vht_link_adaptation' : False,
	'cap_vht_max_mpdu_exp' : '',
	'cap_vht_max_mpdu' : '',
	'cap_vht_short_gi' : [],
	'cap_vht_stbc_rx' : '',
	'cap_vht_stbc_tx' : False,
	'cap_vht_tx_powersave' : False,
	'cap_vht_vht_cf' : False,
	'channel': '',
	'country_code': '',
	'description': '',
	'deleted': False,
	'dhcp_client_id': '',
	'dhcp_hostname': '',
	'dhcp_vendor_class_id': '',
	'dhcpv6_prm_only': False,
	'dhcpv6_temporary': False,
	'disable': False,
	'disable_broadcast_ssid' : False,
	'disable_link_detect' : 1,
	'expunge_failing_stations' : False,
	'hw_id' : '',
	'intf': '',
	'isolate_stations' : False,
	'mac' : '',
	'max_stations' : '',
	'mgmt_frame_protection' : 'disabled',
	'mode' : 'g',
	'phy' : '',
	'reduce_transmit_power' : '',
	'sec_wep' : False,
	'sec_wep_key' : [],
	'sec_wpa' : False,
	'sec_wpa_cipher' : [],
	'sec_wpa_mode' : 'both',
	'sec_wpa_passphrase' : '',
	'sec_wpa_radius' : [],
	'ssid' : '',
	'type' : 'monitor',
	'vif': [],
	'vif_remove': []
	}

	def get_config_name(intf):
	cfg_file = r'/etc/hostapd/{}.cfg'.format(intf)
	return cfg_file


	def wifi_mkdir(directory):
	# create directory on demand
	if not os.path.exists(directory):
	os.mkdir(directory)

	# fix permissions - corresponds to mode 755
	os.chmod(directory, S_IRWXU\|S_IRGRP\|S_IXGRP\|S_IROTH\|S_IXOTH)
	uid = getpwnam(user).pw_uid
	gid = getgrnam(group).gr_gid
	os.chown(directory, uid, gid)


	def subprocess_cmd(command):
	p = Popen(command, stdout=PIPE, shell=True)
	p.communicate()


	def apply_vlan_config(vlan, config):
	"""
	Generic function to apply a VLAN configuration from a dictionary
	to a VLAN interface
	"""

	if type(vlan) != type(VLANIf("lo")):
	raise TypeError()

	# update interface description used e.g. within SNMP
	vlan.set_alias(config['description'])
	# ignore link state changes
	vlan.set_link_detect(config['disable_link_detect'])
	# Maximum Transmission Unit (MTU)
	vlan.set_mtu(config['mtu'])
	# Change VLAN interface MAC address
	if config['mac']:
	vlan.set_mac(config['mac'])

	# enable/disable VLAN interface
	if config['disable']:
	vlan.set_state('down')
	else:
	vlan.set_state('up')

	# Configure interface address(es)
	# - not longer required addresses get removed first
	# - newly addresses will be added second
	for addr in config['address_remove']:
	vlan.del_addr(addr)
	for addr in config['address']:
	vlan.add_addr(addr)


	def get_config():
	wifi = deepcopy(default_config_data)
	conf = Config()

	# determine tagNode instance
	try:
	wifi['intf'] = os.environ['VYOS_TAGNODE_VALUE']
	except KeyError as E:
	print("Interface not specified")

	# check if wireless interface has been removed
	cfg_base = 'interfaces wireless ' + wifi['intf']
	if not conf.exists(cfg_base):
	wifi['deleted'] = True
	# we can not bail out early as wireless interface can not be removed
	# Kernel will complain with: RTNETLINK answers: Operation not supported.
	# Thus we need to remove individual settings
	return wifi

	# set new configuration level
	conf.set_level(cfg_base)

	# retrieve configured interface addresses
	if conf.exists('address'):
	wifi['address'] = conf.return_values('address')

	# get interface addresses (currently effective) - to determine which
	# address is no longer valid and needs to be removed
	eff_addr = conf.return_effective_values('address')
	wifi['address_remove'] = list_diff(eff_addr, wifi['address'])

	# 40MHz intolerance, use 20MHz only
	if conf.exists('capabilities ht 40mhz-incapable'):
	wifi['cap_ht'] = True
	wifi['cap_ht_40mhz_incapable'] = True

	# WMM-PS Unscheduled Automatic Power Save Delivery [U-APSD]
	if conf.exists('capabilities ht auto-powersave'):
	wifi['cap_ht'] = True
	wifi['cap_ht_powersave'] = True

	# Supported channel set width
	if conf.exists('capabilities ht channel-set-width'):
	wifi['cap_ht'] = True
	wifi['cap_ht_chan_set_width'] = conf.return_values('capabilities ht channel-set-width')

	# HT-delayed Block Ack
	if conf.exists('capabilities ht delayed-block-ack'):
	wifi['cap_ht'] = True
	wifi['cap_ht_delayed_block_ack'] = True

	# DSSS/CCK Mode in 40 MHz
	if conf.exists('capabilities ht dsss-cck-40'):
	wifi['cap_ht'] = True
	wifi['cap_ht_dsss_cck_40'] = True

	# HT-greenfield capability
	if conf.exists('capabilities ht greenfield'):
	wifi['cap_ht'] = True
	wifi['cap_ht_greenfield'] = True

	# LDPC coding capability
	if conf.exists('capabilities ht ldpc'):
	wifi['cap_ht'] = True
	wifi['cap_ht_ldpc'] = True

	# L-SIG TXOP protection capability
	if conf.exists('capabilities ht lsig-protection'):
	wifi['cap_ht'] = True
	wifi['cap_ht_lsig_protection'] = True

	# Set Maximum A-MSDU length
	if conf.exists('capabilities ht max-amsdu'):
	wifi['cap_ht'] = True
	wifi['cap_ht_max_amsdu'] = conf.return_value('capabilities ht max-amsdu')

	# Short GI capabilities
	if conf.exists('capabilities ht short-gi'):
	wifi['cap_ht'] = True
	wifi['cap_ht_short_gi'] = conf.return_values('capabilities ht short-gi')

	# Spatial Multiplexing Power Save (SMPS) settings
	if conf.exists('capabilities ht smps'):
	wifi['cap_ht'] = True
	wifi['cap_ht_smps'] = conf.return_value('capabilities ht smps')

	# Support for receiving PPDU using STBC (Space Time Block Coding)
	if conf.exists('capabilities ht stbc rx'):
	wifi['cap_ht'] = True
	wifi['cap_ht_stbc_rx'] = conf.return_value('capabilities ht stbc rx')

	# Support for sending PPDU using STBC (Space Time Block Coding)
	if conf.exists('capabilities ht stbc tx'):
	wifi['cap_ht'] = True
	wifi['cap_ht_stbc_tx'] = True

	# Require stations to support HT PHY (reject association if they do not)
	if conf.exists('capabilities require-ht'):
	wifi['cap_req_ht'] = True

	# Require stations to support VHT PHY (reject association if they do not)
	if conf.exists('capabilities require-vht'):
	wifi['cap_req_vht'] = True

	# Number of antennas on this card
	if conf.exists('capabilities vht antenna-count'):
	wifi['cap_vht'] = True
	wifi['cap_vht_antenna_cnt'] = conf.return_value('capabilities vht antenna-count')

	# set if antenna pattern does not change during the lifetime of an association
	if conf.exists('capabilities vht antenna-pattern-fixed'):
	wifi['cap_vht'] = True
	wifi['cap_vht_antenna_fixed'] = True

	# Beamforming capabilities
	if conf.exists('capabilities vht beamform'):
	wifi['cap_vht'] = True
	wifi['cap_vht_beamform'] = conf.return_values('capabilities vht beamform')

	# VHT operating channel center frequency - center freq 1 (for use with 80, 80+80 and 160 modes)
	if conf.exists('capabilities vht center-channel-freq freq-1'):
	wifi['cap_vht'] = True
	wifi['cap_vht_center_freq_1'] = conf.return_value('capabilities vht center-channel-freq freq-1')

	# VHT operating channel center frequency - center freq 2 (for use with the 80+80 mode)
	if conf.exists('capabilities vht center-channel-freq freq-2'):
	wifi['cap_vht'] = True
	wifi['cap_vht_center_freq_2'] = conf.return_value('capabilities vht center-channel-freq freq-2')

	# VHT operating Channel width
	if conf.exists('capabilities vht channel-set-width'):
	wifi['cap_vht'] = True
	wifi['cap_vht_chan_set_width'] = conf.return_value('capabilities vht channel-set-width')

	# LDPC coding capability
	if conf.exists('capabilities vht ldpc'):
	wifi['cap_vht'] = True
	wifi['cap_vht_ldpc'] = True

	# VHT link adaptation capabilities
	if conf.exists('capabilities vht link-adaptation'):
	wifi['cap_vht'] = True
	wifi['cap_vht_link_adaptation'] = True

	# Set the maximum length of A-MPDU pre-EOF padding that the station can receive
	if conf.exists('capabilities vht max-mpdu-exp'):
	wifi['cap_vht'] = True
	wifi['cap_vht_max_mpdu_exp'] = conf.return_value('capabilities vht max-mpdu-exp')

	# Increase Maximum MPDU length
	if conf.exists('capabilities vht max-mpdu'):
	wifi['cap_vht'] = True
	wifi['cap_vht_max_mpdu'] = conf.return_value('capabilities vht max-mpdu')

	# Increase Maximum MPDU length
	if conf.exists('capabilities vht short-gi'):
	wifi['cap_vht'] = True
	wifi['cap_vht_short_gi'] = conf.return_values('capabilities vht short-gi')

	# Support for receiving PPDU using STBC (Space Time Block Coding)
	if conf.exists('capabilities vht stbc rx'):
	wifi['cap_vht'] = True
	wifi['cap_vht_stbc_rx'] = conf.return_value('capabilities vht stbc rx')

	# Support for the transmission of at least 2x1 STBC (Space Time Block Coding)
	if conf.exists('capabilities vht stbc tx'):
	wifi['cap_vht'] = True
	wifi['cap_vht_stbc_tx'] = True

	# Support for VHT TXOP Power Save Mode
	if conf.exists('capabilities vht tx-powersave'):
	wifi['cap_vht'] = True
	wifi['cap_vht_tx_powersave'] = True

	# STA supports receiving a VHT variant HT Control field
	if conf.exists('capabilities vht vht-cf'):
	wifi['cap_vht'] = True
	wifi['cap_vht_vht_cf'] = True

	# Wireless radio channel
	if conf.exists('channel'):
	wifi['channel'] = conf.return_value('channel')

	# retrieve interface description
	if conf.exists('description'):
	wifi['description'] = conf.return_value('description')

	# get DHCP client identifier
	if conf.exists('dhcp-options client-id'):
	wifi['dhcp_client_id'] = conf.return_value('dhcp-options client-id')

	# DHCP client host name (overrides the system host name)
	if conf.exists('dhcp-options host-name'):
	wifi['dhcp_hostname'] = conf.return_value('dhcp-options host-name')

	# DHCP client vendor identifier
	if conf.exists('dhcp-options vendor-class-id'):
	wifi['dhcp_vendor_class_id'] = conf.return_value('dhcp-options vendor-class-id')

	# DHCPv6 only acquire config parameters, no address
	if conf.exists('dhcpv6-options parameters-only'):
	wifi['dhcpv6_prm_only'] = conf.return_value('dhcpv6-options parameters-only')

	# DHCPv6 temporary IPv6 address
	if conf.exists('dhcpv6-options temporary'):
	wifi['dhcpv6_temporary'] = conf.return_value('dhcpv6-options temporary')

	# Disable broadcast of SSID from access-point
	if conf.exists('disable-broadcast-ssid'):
	wifi['disable_broadcast_ssid'] = True

	# ignore link state changes on this interface
	if conf.exists('disable-link-detect'):
	wifi['disable_link_detect'] = 2

	# Disassociate stations based on excessive transmission failures
	if conf.exists('expunge-failing-stations'):
	wifi['expunge_failing_stations'] = True

	# retrieve real hardware address
	if conf.exists('hw-id'):
	wifi['hw_id'] = conf.return_value('hw-id')

	# Isolate stations on the AP so they cannot see each other
	if conf.exists('isolate-stations'):
	wifi['isolate_stations'] = True

	# Media Access Control (MAC) address
	if conf.exists('mac'):
	wifi['mac'] = conf.return_value('mac')

	# Maximum number of wireless radio stations
	if conf.exists('max-stations'):
	wifi['max_stations'] = conf.return_value('max-stations')

	# Management Frame Protection (MFP) according to IEEE 802.11w
	if conf.exists('mgmt-frame-protection'):
	wifi['mgmt_frame_protection'] = conf.return_value('mgmt-frame-protection')

	# Wireless radio mode
	if conf.exists('mode'):
	wifi['mode'] = conf.return_value('mode')

	# Wireless physical device
	if conf.exists('phy'):
	wifi['phy'] = conf.return_value('phy')

	# Transmission power reduction in dBm
	if conf.exists('reduce-transmit-power'):
	wifi['reduce_transmit_power'] = conf.return_value('reduce-transmit-power')

	# WEP enabled?
	if conf.exists('security wep'):
	wifi['sec_wep'] = True

	# WEP encryption key(s)
	if conf.exists('security wep key'):
	wifi['sec_wep_key'] = conf.return_values('security wep key')

	# WPA enabled?
	if conf.exists('security wpa'):
	wifi['sec_wpa'] = True

	# WPA Cipher suite
	if conf.exists('security wpa cipher'):
	wifi['sec_wpa_cipher'] = conf.return_values('security wpa cipher')

	# WPA mode
	if conf.exists('security wpa mode'):
	wifi['sec_wpa_mode'] = conf.return_value('security wpa mode')

	# WPA default ciphers depend on WPA mode
	if not wifi['sec_wpa_cipher']:
	if wifi['sec_wpa_mode'] == 'wpa':
	wifi['sec_wpa_cipher'].append('TKIP')
	wifi['sec_wpa_cipher'].append('CCMP')

	elif wifi['sec_wpa_mode'] == 'wpa2':
	wifi['sec_wpa_cipher'].append('CCMP')

	elif wifi['sec_wpa_mode'] == 'both':
	wifi['sec_wpa_cipher'].append('CCMP')
	wifi['sec_wpa_cipher'].append('TKIP')

	# WPA personal shared pass phrase
	if conf.exists('security wpa passphrase'):
	wifi['sec_wpa_passphrase'] = conf.return_value('security wpa passphrase')

	# WPA radius server goes here
	for server in conf.list_nodes('security wpa radius-server'):
	# set new configuration level
	conf.set_level(cfg_base + ' security wpa radius-server ' + server)

	radius = {
	'server' : server,
	'acc_port' : '',
	'port' : 1812,
	'secret' : ''
	}

	# receive RADIUS accounting info
	if conf.exists('accounting'):
	radius['acc_port'] = conf.return_value('accounting')

	# RADIUS server port
	if conf.exists('port'):
	radius['port'] = conf.return_value('port')

	# RADIUS server shared-secret
	if conf.exists('secret'):
	radius['secret'] = conf.return_value('secret')

	# append RADIUS server to list of servers
	wifi['sec_wpa_radius'].append(radius)

	# re-set configuration level to parse new nodes
	conf.set_level(cfg_base)

	# Wireless access-point service set identifier (SSID)
	if conf.exists('ssid'):
	wifi['ssid'] = conf.return_value('ssid')

	# Wireless device type for this interface
	if conf.exists('type'):
	wifi['type'] = conf.return_value('type')

	# re-set configuration level to parse new nodes
	conf.set_level(cfg_base)
	# Determine vif interfaces (currently effective) - to determine which
	# vif interface is no longer present and needs to be removed
	eff_intf = conf.list_effective_nodes('vif')
	act_intf = conf.list_nodes('vif')
	wifi['vif_remove'] = list_diff(eff_intf, act_intf)

	if conf.exists('vif'):
	for vif in conf.list_nodes('vif'):
	# set config level to vif interface
	conf.set_level(cfg_base + ' vif ' + vif)
	wifi['vif'].append(vlan_to_dict(conf))


	# retrieve configured regulatory domain
	conf.set_level('system')
	if conf.exists('wifi-regulatory-domain'):
	wifi['country_code'] = conf.return_value('wifi-regulatory-domain')

	return wifi


	def verify(wifi):
	if wifi['deleted']:
	return None

	if wifi['type'] != 'monitor' and not wifi['ssid']:
	raise ConfigError('SSID must be set for {}'.format(wifi['intf']))

	if wifi['type'] == 'access-point' and not wifi['channel']:
	raise ConfigError('Channel must be set for {}'.format(wifi['intf']))

	if len(wifi['sec_wep_key']) > 4:
	raise ConfigError('No more then 4 WEP keys configurable')

	if wifi['cap_vht'] and not wifi['cap_ht']:
	raise ConfigError('Specify HT flags if you want to use VHT!')

	if wifi['cap_vht_beamform'] and wifi['cap_vht_antenna_cnt'] == 1:
	raise ConfigError('Cannot use beam forming with just one antenna!')

	if wifi['sec_wep'] and (len(wifi['sec_wep_key']) == 0):
	raise ConfigError('Missing WEP keys')

	if wifi['sec_wpa'] and not (wifi['sec_wpa_passphrase'] or wifi['sec_wpa_radius']):
	raise ConfigError('Misssing WPA key or RADIUS server')

	conf = Config()
	if not conf.exists('system wifi-regulatory-domain'):
	raise ConfigError('Wireless regulatory domain is mandatory.\n' \
	'Use "set system wifi-regulatory-domain" to set.')

	return None

	def generate(wifi):
	if wifi['deleted']:
	if os.path.isfile(get_config_name(wifi['intf'])):
	os.unlink(get_config_name(wifi['intf']))

	return None

	# create config directory on demand
	directory = os.path.dirname(get_config_name(wifi['intf']))
	wifi_mkdir(directory)

	tmpl = Template(config_hostapd_tmpl)
	config_text = tmpl.render(wifi)
	with open(get_config_name(wifi['intf']), 'w') as f:
	f.write(config_text)

	return None

	def apply(wifi):
	pid = 0
	pidfile = '/var/run/hostapd/{}.pid'.format(wifi['intf'])
	if os.path.isfile(pidfile):
	pid = 0
	with open(pidfile, 'r') as f:
	pid = int(f.read())

	# always stop hostapd service first before reconfiguring it
	if pid_exists(pid):
	cmd = 'start-stop-daemon --stop --quiet'
	cmd += ' --pidfile ' + pidfile
	subprocess_cmd(cmd)

	w = EthernetIf(wifi['intf'])
	if wifi['deleted']:
	# delete interface
	w.remove()
	else:
	# Some parts e.g. MAC address can't be changed when interface is up
	w.set_state('down')

	# update interface description used e.g. within SNMP
	w.set_alias(wifi['description'])

	# get DHCP config dictionary and update values
	opt = w.get_dhcp_options()

	if wifi['dhcp_client_id']:
	opt['client_id'] = wifi['dhcp_client_id']

	if wifi['dhcp_hostname']:
	opt['hostname'] = wifi['dhcp_hostname']

	if wifi['dhcp_vendor_class_id']:
	opt['vendor_class_id'] = wifi['dhcp_vendor_class_id']

	# store DHCP config dictionary - used later on when addresses are aquired
	w.set_dhcp_options(opt)

	# get DHCPv6 config dictionary and update values
	opt = w.get_dhcpv6_options()

	if wifi['dhcpv6_prm_only']:
	opt['dhcpv6_prm_only'] = True

	if wifi['dhcpv6_temporary']:
	opt['dhcpv6_temporary'] = True

	# store DHCPv6 config dictionary - used later on when addresses are aquired
	w.set_dhcpv6_options(opt)

	# ignore link state changes
	w.set_link_detect(wifi['disable_link_detect'])

	# Change interface MAC address - re-set to real hardware address (hw-id)
	# if custom mac is removed
	if wifi['mac']:
	w.set_mac(wifi['mac'])
	else:
	w.set_mac(wifi['hw_id'])

	# enable interface
	if not wifi['disable']:
	w.set_state('up')

	# Configure interface address(es)
	# - not longer required addresses get removed first
	# - newly addresses will be added second
	for addr in wifi['address_remove']:
	w.del_addr(addr)
	for addr in wifi['address']:
	w.add_addr(addr)

	# remove no longer required VLAN interfaces (vif)
	for vif in wifi['vif_remove']:
	e.del_vlan(vif)

	# create VLAN interfaces (vif)
	for vif in wifi['vif']:
	# QoS priority mapping can only be set during interface creation
	# so we delete the interface first if required.
	if vif['egress_qos_changed'] or vif['ingress_qos_changed']:
	try:
	# on system bootup the above condition is true but the interface
	# does not exists, which throws an exception, but that's legal
	e.del_vlan(vif['id'])
	except:
	pass

	vlan = e.add_vlan(vif['id'])
	apply_vlan_config(vlan, vif)

	# Physical interface is now configured. Proceed by starting hostapd
	cmd = 'start-stop-daemon --start --quiet'
	cmd += ' --pidfile ' + pidfile
	cmd += ' --exec /usr/sbin/hostapd'
	# now pass arguments to hostapd binary
	cmd += ' --'
	cmd += ' -P ' + pidfile
	cmd += ' -B ' + get_config_name(wifi['intf'])

	# execute assembled command
	subprocess_cmd(cmd)

	return None

	if __name__ == '__main__':
	try:
	c = get_config()
	verify(c)
	generate(c)
	apply(c)
	except ConfigError as e:
	print(e)
	exit(1)

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