#!/bin/bash
# Network Interface Configuration System
# Copyright (c) 1996-2009 Red Hat, Inc. all rights reserved.
#
# Based on PCMCIA wireless script by (David Hinds/Jean Tourrilhes)
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2,
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# Configure wireless network device options.  See iw(8) for more info.
# Mageia prefixes the following variables with WIRELESS_ prefix.
# Valid variables:
#    MODE: Ad-Hoc, Managed, etc.
#    ESSID: Name of the wireless network
#    NWID: Name of this machine on the network.  Hostname is default
#    FREQ: Frequency to operate on.  See CHANNEL
#    CHANNEL: Numbered frequency to operate on.  See FREQ
#    SENS: Sensitivity threshold for packet rejection.
#    RATE: Transfer rate.  Usually one of Auto, 11, 5, 2, or 1.
#    RTS: Explicit RTS handshake.  Usually not specified (auto)
#    FRAG: Fragmentation threshold to split packets.  Usually not specified.
#    IWCONFIG: Extra parameters to pass directly to IWCONFIG
#    IWPRIV: Extra parameters to pass directly to IWPRIV
#
#    redhat-only variables:
#    KEY: Encryption key for WEP.
#    KEY[1-4]: Encryption key for WEP in position [1-4]
#    SECURITYMODE: Security mode, e.g: 'open' or 'restricted'
#    SPYIPS: List of IP addresses to "spy" on for link performance stats.
#
#    mandriva-only variables:
#    WIRELESS_NICK: nickname for wireless connection
#    WIRELESS_ENC_KEY: Encryption key for WEP.
#    WIRELESS_ENC_MODE: Security mode, e.g: 'open' or 'restricted'
#    WIRELESS_XSUPPLICANT: Enabling xsupplicant support
#    WIRELESS_XSUPPLICANT_FILE: Custom location for xsupplicant.conf file

# Only meant to be called from ifup.

# unify variables common to RH and Mageia-style ifcfg
MODE=${MODE:-$WIRELESS_MODE}
ESSID=${ESSID:-$WIRELESS_ESSID}
NWID=${NWID:-$WIRELESS_NWID}
FREQ=${FREQ:-$WIRELESS_FREQ}
CHANNEL=${CHANNEL:-$WIRELESS_CHANNEL}
SENS=${SENS:-$WIRELESS_SENS}
RATE=${RATE:-$WIRELESS_RATE}
POWER=${POWER:-$WIRELESS_POWER}
RTS=${RTS:-$WIRELESS_RTS}
FRAG=${FRAG:-$WIRELESS_FRAG}
IWCONFIG=${IWCONFIG:-$WIRELESS_IWCONFIG}
IWSPY=${IWSPY:-$WIRELESS_IWSPY}
IWPRIV=${IWPRIV:-$WIRELESS_IWPRIV}

# Mode need to be first : some settings apply only in a specific mode !
if [ -n "$MODE" ] ; then
    # for some cards, the mode can only be set with the card is down
    # so we bring the card down (and suspending ifplugd if it is running)
    # in order to do so (mdv bug #43166)
    ifplugd -S -i $DEVICE 2>/dev/null
    /sbin/ip link set dev $DEVICE down
    iwconfig $DEVICE mode $MODE
    ifplugd -R -i $DEVICE 2>/dev/null
fi

# Set link up (some cards require this.)
/sbin/ip link set dev ${DEVICE} up

# Setup the card nickname
# This is a bit hackish, but should do the job right...
if [ -n "$ESSID" -o -n "$MODE" ] ; then
    NICKNAME=$(/bin/hostname)
    iwconfig $DEVICE nick "$NICKNAME" >/dev/null 2>&1
fi
if [ -n "$WIRELESS_NICK" ] ; then
    iwconfig $DEVICE nick $WIRELESS_NICK >/dev/null 2>&1
elif [ -n "$ESSID" ] || [ -n "$MODE" ] ; then
   # This is a bit hackish, but should do the job right...
    NICKNAME=`/bin/hostname`
    iwconfig $DEVICE nick $NICKNAME >/dev/null 2>&1
fi

# Regular stuff...
# network id
if [ -n "$NWID" ] ; then
    iwconfig $DEVICE nwid $NWID
fi

# frequency and channel
if [ -n "$FREQ" -a "$MODE" != "Managed" ] ; then
    iwconfig $DEVICE freq $FREQ
elif [ -n "$CHANNEL" -a "$MODE" != "Managed" ] ; then
    iwconfig $DEVICE channel $CHANNEL
fi

# sensitivity
if [ -n "$SENS" ] ; then
    iwconfig $DEVICE sens $SENS
fi

# rate
if [ -n "$RATE" ] ; then
    iwconfig $DEVICE rate "$RATE"
fi

# encryption
# for redhat-style ifcfg
if [ -n "$KEY" -o -n "$KEY1" -o -n "$KEY2" -o -n "$KEY3" -o -n "$KEY4" ] ; then
    [ -n "$KEY1" ] && iwconfig $DEVICE key "[1]" $KEY1
    [ -n "$KEY2" ] && iwconfig $DEVICE key "[2]" $KEY2
    [ -n "$KEY3" ] && iwconfig $DEVICE key "[3]" $KEY3
    [ -n "$KEY4" ] && iwconfig $DEVICE key "[4]" $KEY4
    [ -n "$DEFAULTKEY" ] && iwconfig $DEVICE key "[${DEFAULTKEY}]"
    [ -n "$KEY" ] && iwconfig $DEVICE key $KEY
else
    iwconfig $DEVICE key off
fi

# for mandriva-style ifcfg
if [ -n "$WIRELESS_ENC_KEY" -o "$WIRELESS_ENC_MODE" ] ; then
    if [ -n "$WIRELESS_ENC_MODE" ]; then
        iwconfig $DEVICE key $WIRELESS_ENC_MODE "$WIRELESS_ENC_KEY"
    else
        # compatibility for older config files
        # that used to contain enc mode in key
        echo "$WIRELESS_ENC_KEY" | egrep -q '^(open|restricted) '
        if [ $? == 0 ]; then
                iwconfig $DEVICE key $WIRELESS_ENC_KEY
        else
                iwconfig $DEVICE key "$WIRELESS_ENC_KEY"
        fi
    fi
fi

# security mode
if [ -n "$SECURITYMODE" ]; then
    iwconfig $DEVICE enc $SECURITYMODE
fi

# power
if [ -n "$POWER" ] ; then
    iwconfig $DEVICE power $POWER
fi

# rts
if [ -n "$RTS" ] ; then
    iwconfig $DEVICE rts $RTS
fi

# fragmentation
if [ -n "$FRAG" ] ; then
    iwconfig $DEVICE frag $FRAG
fi

# More specific parameters passed directly to IWCONFIG
if [ -n "$IWCONFIG" ] ; then
    iwconfig $DEVICE $IWCONFIG
fi

# iwspy settings
if [ -n "$SPYIPS" ] ; then
    for IP in $SPYIPS; do
        iwspy $DEVICE + $IP
    done
fi
if [ -n "$IWSPY" ] ; then
    /sbin/iwspy $DEVICE $IWSPY
fi

# private options
if [ -n "$IWPRIV" ] ; then
    IFS=$'\n' echo "$IWPRIV" | while read priv; do
        [ -n -n "$priv" ] && eval "/sbin/iwpriv $DEVICE $priv"
    done
fi

# ESSID need to be last : most device re-perform the scanning/discovery
# when this is set, and things like encryption keys are better be
# defined if we want to discover the right set of APs/nodes.
if [ -n "$ESSID" ] ; then
    iwconfig $DEVICE essid "$ESSID"
else
    # use any essid
    iwconfig $DEVICE essid any >/dev/null 2>&1
fi