slackware-current/source/n/wireless_tools/scripts/rc.wireless

#!/bin/sh
# /etc/rc.d/rc.wireless
# $Id: rc.wireless,v 1.13 2007/04/13 14:14:43 eha Exp eha $
#
# Wireless network card setup.
#
# This script sets up PCI, USB, and 32-bit Cardbus wireless devices
# NOT 16-bit PCMCIA cards!  Those are configured in /etc/pcmcia/.
# Single parameter to this script is the name of a network interface.
# Normally this script is called from rc.inet1 rather than run
# directly.
#
# This script is a modified '/etc/pcmcia/wireless' script
# 09/apr/2004 by Eric Hameleers
# 16/sep/2004 * Eric Hameleers * Fixed iwspy and iwpriv commands
# 08/apr/2005 * Eric Hameleers * Allow per-interface overrides of the wireless
#                                parameters (see /etc/rc.d/rc.inet1.conf)
# 11/apr/2005 * Eric Hameleers * Tune wpa_supplicant interactions.
# 23/apr/2005 * Eric Hameleers * First configure card with iwconfig,
#                                before starting wpa_supplicant
# 27/apr/2005 * Eric Hameleers * Multiple 'iwpriv $INTERFACE set' commands.
# 14/feb/2006 * Eric Hameleers * Better error messages; alternative way of
#                                getting HWADDR; parametrized WPA_WAIT value.
#                                Don't kill an already running wpa_supplicant.
# 29/apr/2006 * Pat Volkerding * Reverted HWADDR change, since it relies on
#                                a binary (macaddr) that is not built or
#                                installed by default since it is not
#                                compatible with all interfaces.
# 15/aug/2006 * Eric Hameleers * Added missing "" around $ESSID, which broke
#                                ESSIDs that contain a space character.
# 10/oct/2006 * Eric Hameleers * Added default empty values for all parameters.
#                                This makes a second wireless card leave
#                                wpa_supplicant alone if WPA is not configured.
# 15/oct/2006 * Eric Hameleers * Swapped the calls to "key <key>" and
#                                "key restricted" since that might be needed
#                                for WEP to work reliably.
# 09/jan/2007 * Eric Hameleers * Add explicit default values to wireless params;
#                                also set the ESSID before IWPRIV commands,
#                                needed for some RaLink cards;
#                                use /proc/net/wireless instead of calling
#                                iwconfig to determine if a card is wireless.
# 13/apr/2007 * Eric Hameleers * Use of the IWPRIV variable was broken.
#                                NOTE: if you need to enter multiple parameters
#                                in IWPRIV, you must separate them with the pipe
#                                (|) character - this used to be a space char!
#                                See the example in rc.inet1.conf.
# 16/apr/2008 * Pat Volkerding * Make sure that HWADDR is all upper case.
# 23/apr/2008 * Pat Volkerding * Increase sleep time after bringing up an
#                                interface to 3 seconds.  Some drivers
#                                need this additional time to initalize.
# 02/jan/2010 * Pat Volkerding * Look for /sys/class/net/$NETDEV/wireless rather
#                                than the contents of /proc/net/wireless to find
#                                if a network device is wireless.  In newer
#                                kernels devices will not show up in
#                                /proc/net/wireless until active.
# 16/aug/2012 * Pat Volkerding * Use several tests to determine if an interface
#                                is wireless, as the reliability of any given
#                                test may depend on the kernel options and the
#                                wireless driver used.
#                                Convert the MAC address to uppercase in sed.
# 11/Nov/2019 * Darren Austin *  Log to syslog, failling back to stdout.
#                                Output error to stderr if not called from
#                                rc.inet1.
# 09/Mar/2021 * Darren Austin *  Don't leave the interface in an 'up' state upon
#                                exit from the script - this causes problems for
#                                SLAAC in rc.inet1 when control is returned.
# ------------------------------------------------------------------------------

# If possible, log events in /var/log/messages:
if [ -f /var/run/syslogd.pid ] && [ -x /usr/bin/logger ]; then
  LOGGER=/usr/bin/logger
else # output to stdout/stderr:
  LOGGER=/bin/cat
fi

if [ -z "$IFNAME" ] ; then
  echo "ERROR: The script 'rc.wireless' must be executed by 'rc.inet1'!" >&2
  echo "       You should run the command \"/etc/rc.d/rc.inet1 <your_interface>_start\" yourself." >&2
  return 1 2> /dev/null || exit 1
fi

INTERFACE=$1

# Find the path where wireless tools are installed
for IWPATH in /usr/{bin,sbin} /usr/local/{bin,sbin} /sbin /bin ; do
    if [ -x $IWPATH/iwconfig ] ; then break ; fi
done

# The same for wpa_supplicant (needed for WPA support)
for SUPPATH in /usr/{bin,sbin} /usr/local/{bin,sbin} /sbin /bin ; do
    if [ -x $SUPPATH/wpa_supplicant ] ; then break ; fi
done

# Set all desired settings through the wireless tools
IWCOMMAND="$IWPATH/iwconfig ${INTERFACE}"
IWPRIVCMD="$IWPATH/iwpriv ${INTERFACE}"
IWSPYCMD="$IWPATH/iwspy ${INTERFACE}"
IFCOMMAND="/sbin/ip link set dev ${INTERFACE}"

is_wireless_device ()
{
    # Return 0 for a wireless interface, or 1 for a non-wireless interface.
    if [ -d /sys/class/net/${1}/wireless ]; then
        return 0
    elif grep -Fxq 'DEVTYPE=wlan' /sys/class/net/${1}/uevent 2>/dev/null; then 
        return 0
    elif LC_ALL=C $IWPATH/iwconfig $1 2>&1 | grep -q "IEEE 802.11" ; then
        return 0
    else # all tests failed, assume the device is not wireless (or add a better test :)
        return 1
    fi
}

###############
# EXIT POINTS #
###############

# Is the device wireless?  If not, exit this script.
is_wireless_device ${INTERFACE} || return 0 2> /dev/null || exit 0

# If we stop a wireless interface using wpa_supplicant,
# we'll kill its wpa_supplicant daemon too and exit this script:
if [ "$2" = "stop" ]; then
	pkill --full "bin/wpa_supplicant.* -i${INTERFACE}"
	return 0
fi

# -----------------------------------------------------
# Continue with the script - bringing the interface UP.
# -----------------------------------------------------

# Bring interface up - for determining the HWADDR
$IFCOMMAND up
sleep 3

# Get the MAC address for the interface
HWADDR=$(cat "/sys/class/net/${INTERFACE}/address")

# Empty all wireless parameters- some of them could still be set for a previous interface:
# when rc.inet1 is sourced from rc.M all scripts are run in the same shell.
CHANNEL=""
ESSID=""
FREQ=""
FRAG=""
IWCONFIG=""
IWPRIV=""
IWSPY=""
KEY=""
MODE=""
NICKNAME=""
NWID=""
RATE=""
RTS=""
SENS=""
WPA=""
WPADRIVER=""
WPACONF=""
WPAWAIT=""
# Read the configuration information for the card with address $HWADDR
# from /etc/rc.d/rc.wireless.conf:
[[ -r /etc/rc.d/rc.wireless.conf ]] && . /etc/rc.d/rc.wireless.conf

# Let any per-interface overrides (the WLAN_xxxx parameters) that are set
# in /etc/rc.d/rc.inet1.conf have precedence.
# The reason: you might have multiple wireless cards of the same brand, or
# connecting to multiple networks.
# Position 'i' of this interface in the IFNAME array was determined in rc.inet1
CHANNEL=${WLAN_CHANNEL[$i]:-${CHANNEL}}
ESSID=${WLAN_ESSID[$i]:-${ESSID}}
FREQ=${WLAN_FREQ[$i]:-${FREQ}}
FRAG=${WLAN_FRAG[$i]:-${FRAG}}
IWCONFIG=${WLAN_IWCONFIG[$i]:-${IWCONFIG}}
IWPRIV=${WLAN_IWPRIV[$i]:-${IWPRIV}}
IWSPY=${WLAN_IWSPY[$i]:-${IWSPY}}
KEY=${WLAN_KEY[$i]:-${KEY}}
MODE=${WLAN_MODE[$i]:-${MODE}}
NICKNAME=${WLAN_NICKNAME[$i]:-${NICKNAME}}
NWID=${WLAN_NWID[$i]:-${NWID}}
RATE=${WLAN_RATE[$i]:-${RATE}}
RTS=${WLAN_RTS[$i]:-${RTS}}
SENS=${WLAN_SENS[$i]:-${SENS}}
WPA=${WLAN_WPA[$i]:-${WPA}}
# The "ext" interface will be default if not explicitly set
WPADRIVER=${WLAN_WPADRIVER[$i]:-${WPADRIVER:="wext"}}
# The default config file as installed by the wpa_supplicant package:
WPACONF=${WLAN_WPACONF[$i]:-${WPACONF:="/etc/wpa_supplicant.conf"}}
WPAWAIT=${WLAN_WPAWAIT[$i]:-${WPAWAIT:="60"}}


[ -n "$VERBOSE" ] && [ -n "$INFO" ] && echo "$0:  $1 information: '$INFO'"

###################
# WIRELESS CONFIG #
###################

# Mode needs to be first : some settings apply only in a specific mode!
if [ -n "$MODE" ] ; then
	echo "$0:  $IWCOMMAND mode $MODE" | $LOGGER
        # if $IWCOMMAND fails, try taking the interface down to run it.
        # Some drivers require this.
	if ! $IWCOMMAND mode $MODE 2> /dev/null ; then
		$IFCOMMAND down
		$IWCOMMAND mode $MODE
		$IFCOMMAND up
		sleep 3
        fi
fi
# This is a bit hackish, but should do the job right...
if [ ! -n "$NICKNAME" ] ; then
    NICKNAME=$(/bin/hostname)
fi
if [ -n "$ESSID" ] || [ -n "$MODE" ] ; then
	echo "$0:  $IWCOMMAND nick $NICKNAME" | $LOGGER
	$IWCOMMAND nick $NICKNAME
fi
# Regular stuff...
if [ -n "$NWID" ] ; then
	echo "$0:  $IWCOMMAND nwid $NWID" | $LOGGER
	$IWCOMMAND nwid $NWID
fi
if [ -n "$FREQ" ] ; then
	echo "$0:  $IWCOMMAND freq $FREQ" | $LOGGER
	$IWCOMMAND freq $FREQ
elif [ -n "$CHANNEL" ] ; then
	echo "$0:  $IWCOMMAND channel $CHANNEL" | $LOGGER
	$IWCOMMAND channel $CHANNEL
fi

# WEP keys (non-WPA) 
if [ -n "$KEY" ] && [ ! -n "$WPA" ] ; then
	if [ "$KEY" = "off" ]; then
	  echo "$0:  $IWCOMMAND key open" | $LOGGER
	  $IWCOMMAND key open
	  echo "$0:  $IWCOMMAND key off" | $LOGGER
	  $IWCOMMAND key off
	else 
	  echo "$0:  $IWCOMMAND key ************" | $LOGGER
	  $IWCOMMAND key $KEY
	  if ! echo "$KEY" | egrep -qw "restricted|open" ; then
	    # Set "restricted" as the default security mode:
	    echo "$0:  $IWCOMMAND key restricted" | $LOGGER
	    $IWCOMMAND key restricted
	  fi
	fi
fi
if [ -n "$SENS" ] ; then
	echo "$0:  $IWCOMMAND sens $SENS" | $LOGGER
	$IWCOMMAND sens $SENS
fi
if [ -n "$RATE" ] ; then
	echo "$0:  $IWCOMMAND rate $RATE" | $LOGGER
	$IWCOMMAND rate $RATE
fi
if [ -n "$RTS" ] ; then
	echo "$0:  $IWCOMMAND rts $RTS" | $LOGGER
	$IWCOMMAND rts $RTS
fi
if [ -n "$FRAG" ] ; then
	echo "$0:  $IWCOMMAND frag $FRAG" | $LOGGER
	$IWCOMMAND frag $FRAG
fi
# More specific parameters
if [ -n "$IWCONFIG" ] ; then
	echo "$0:  $IWCOMMAND $IWCONFIG" | $LOGGER
	$IWCOMMAND $IWCONFIG
fi
if [ -n "$IWSPY" ] ; then
	echo "$0:  $IWSPYCMD $IWSPY" | $LOGGER
	$IWSPYCMD $IWSPY
fi
# For RaLink cards, the SSID must be set right before configuring WPAPSK/TKIP parameters
# using iwpriv commands in order to generate the wpapsk password. This should not hurt other cards:
if [ -n "$ESSID" ] ; then
  echo "$0:  $IWCOMMAND essid \"$ESSID\"" | $LOGGER
  $IWCOMMAND essid "$ESSID"
fi
# The iwpriv can set one private IOCTL at the time, so if the $IWPRIV
# variable contains multiple pipe ('|') separated settings, we split them here:
# WARNING: if your iwpriv commands contain a WEP/WPA key, these can be logged
# in /var/log/messages!
if [ -n "$IWPRIV" ] ; then
  echo "${IWPRIV}|" | \
  while read -d '|' iwi; do
    if [ -n "$iwi" ]; then
      echo "$0:  $IWPRIVCMD $iwi" | $LOGGER
      $IWPRIVCMD $iwi
    fi
  done
fi

##################
# WPA_SUPPLICANT #
##################

# Support for WPA (wireless protected access) is provided by wpa_supplicant
# for those drivers that support it (and it looks like wpa_supplicant is
# the future for WPA support in Linux anyway)
if [ "$WPA" = "wpa_supplicant" ] || [ "$WPA" = "wpaxsupplicant" ] && [ -x ${SUPPATH}/wpa_supplicant ]; then
	# Interface down, so wpa_supplicant can associate with the AP
	$IFCOMMAND down
	#WPACONF=${WPACONF:-/etc/wpa_supplicant.conf}
	WPA_OPTIONS=""
	[ -n "$WPADRIVER" ] && WPA_OPTIONS="-D${WPADRIVER}" # specify the driver
	[ "$WPA" = "wpaxsupplicant" ] && WPA_OPTIONS="${WPA_OPTIONS} -e" # Use external xsupplicant (disables the internal supplicant)

	# We leave a running wpa_supplicant process in peace:
	if pgrep --full "bin/wpa_supplicant.* -i${INTERFACE}" >/dev/null ; then
	  echo "$0:  wpa_supplicant found running already" | $LOGGER
	else
	  echo "$0:  wpa_supplicant -B -c${WPACONF} ${WPA_OPTIONS} -i$INTERFACE" | $LOGGER
	  ${SUPPATH}/wpa_supplicant -B -c${WPACONF} ${WPA_OPTIONS} -i$INTERFACE
	fi

	# Buy wpa_supplicant some time to authenticate before bringing the
	# interface back up... but we don't wait forever:
	# You can increase this value in rc.inet1.conf (WLAN_WPAWAIT) or rc.wireless.conf (WPAWAIT)
        # if your card takes longer to associate:
	WPAWAIT=${WPAWAIT:-10}
	wi=0
	while [ $wi -lt $WPAWAIT ]; do
	  wi=$(($wi+1)); sleep 1
	  if (grep -q "^ctrl_interface=" ${WPACONF}); then
	    if (LC_ALL=C ${SUPPATH}/wpa_cli -i$INTERFACE status | grep -q "^wpa_state=COMPLETED"); then break; fi
	  else
	    if (LC_ALL=C ${IWCOMMAND} | grep -Eq "Encryption key:....-"); then break; fi
	  fi
	done
	if [ $wi -eq $WPAWAIT ]; then
	  echo "$0:  WPA authentication did not complete, try running '/etc/rc.d/rc.inet1 ${INTERFACE}_start' in a few seconds." | $LOGGER
	fi
	# Bring interface up to avoid 'not ready' errors when calling iwconfig
        # Update 09/Mar/21: No point bringing it up here to be taken down at exit.
	# $IFCOMMAND up
	# sleep 3
else
	# ESSID need to be last: most devices re-perform the scanning/discovery
	# when this is set, and things like encryption keys had better be
	# defined if we want to discover the right set of APs/nodes.
	# NOTE: when automatic association does not work, but you manage to get
	# an IP address by manually setting the ESSID and then calling dhcpcd,
	# then the cause might be the incorrect definition of your ESSID="bla"
	# parameter in rc.wireless.conf.
	# Debug your wireless problems by running 'iwevent' while the card
	# is being configured.
	if [ -n "$ESSID" ] ; then
	  echo "$0:  $IWCOMMAND essid \"$ESSID\"" | $LOGGER
	  $IWCOMMAND essid "$ESSID"
	fi
fi
$IFCOMMAND down
sleep 3