executors: add wifi executor

This commit is contained in:
Ariadne Conill 2020-12-02 18:20:07 -07:00
parent cef4fafdb9
commit f77d3558f7
2 changed files with 75 additions and 1 deletions

View file

@ -108,7 +108,8 @@ EXECUTOR_SCRIPTS_OPT ?= \
gre \ gre \
wireguard \ wireguard \
ethtool \ ethtool \
batman batman \
wifi
EXECUTOR_SCRIPTS ?= ${EXECUTOR_SCRIPTS_CORE} ${EXECUTOR_SCRIPTS_OPT} EXECUTOR_SCRIPTS ?= ${EXECUTOR_SCRIPTS_CORE} ${EXECUTOR_SCRIPTS_OPT}

73
executor-scripts/linux/wifi Executable file
View file

@ -0,0 +1,73 @@
#!/bin/sh
# Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# This software is provided 'as is' and without any warranty, express or
# implied. In no event shall the authors be liable for any damages arising
# from the use of this software.
#
# Manage wifi connections using wpa_supplicant.
#
# Vocabulary:
# wifi-ssid - The SSID name to connect to.
# wifi-psk - The pre-shared key to use.
# wifi-config - A path to a wpa_supplicant config file, for special configs.
#
# If wifi-config is not set, wifi-ssid and wifi-psk are required, and a config
# will be generated as /run/wpa_supplicant.$IFACE.conf.
#
# The wpa_supplicant PID is stored in /run/wpa_supplicant.$IFACE.pid.
die() {
printf "ERROR: %s\n" "$1" >&2
exit 1
}
[ -z "$IFACE" ] && die "IFACE not set"
[ -z "$PHASE" ] && die "PHASE not set"
PIDFILE="/run/wpa_supplicant.$IFACE.pid"
# Set IF_WIFI_CONFIG_PATH to the default path if not already set.
[ -z "$IF_WIFI_CONFIG_PATH" ] && IF_WIFI_CONFIG_PATH="/run/wpa_supplicant.$IFACE.conf"
# Supplicant options.
WPA_SUPPLICANT_OPTS="-qq -B -i$IFACE -c$IF_WIFI_CONFIG_PATH -P$PIDFILE"
# Given $IF_WIFI_SSID and $IF_WIFI_PSK, generate a config file at $IF_WIFI_CONFIG_PATH.
generate_config() {
[ -z "$IF_WIFI_SSID" ] && die "wifi-ssid not set"
[ -z "$IF_WIFI_PSK" ] && die "wifi-psk not set"
# We use a pipeline here to avoid leaking PSK into the process name.
(echo $IF_WIFI_PSK | /sbin/wpa_passphrase $IF_WIFI_SSID) >$IF_WIFI_CONFIG_PATH
[ ! -e "$IF_WIFI_CONFIG_PATH" ] && die "failed to write temporary config: $IF_WIFI_CONFIG_PATH"
}
# Start a supplicant process for $IFACE.
start() {
# If there is no config file located at $IF_WIFI_CONFIG_PATH, generate one.
[ ! -e "$IF_WIFI_CONFIG_PATH" ] && generate_config
/sbin/wpa_supplicant $WPA_SUPPLICANT_OPTS
}
# Stop the supplicant process for $IFACE.
stop() {
kill -9 $(cat $PIDFILE) 2>/dev/null
rm $PIDFILE
}
[ -z "$VERBOSE" ] || set -x
case "$PHASE" in
pre-up)
start
;;
post-down)
stop
;;
esac