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