netcfg-rt73/wirelessral.subr

   1 #! /bin/bash
   2
   3 #
   4 # Netcfg2 support for ralink wireless devices with WPA support.
   5 # Author: Paulo Matias <matias at archlinux-br dot org>
   6 #
   7
   8 # Uses wireless_tools, to check for association to a network.
   9 # wep_check interface [timeout]
  10 wep_check()
  11 {
  12     INTERFACE=$1; TIMEOUT=$2
  13
  14     [[ -z "$TIMEOUT" ]] && TIMEOUT=15
  15     let timeout=0
  16     while [[ $timeout -ne $TIMEOUT ]]; do
  17         bssid=`iwgetid $INTERFACE -ra`
  18         [[ ! "$bssid" = "00:00:00:00:00:00" ]] && return 0
  19         sleep 1
  20         let timeout++
  21     done
  22
  23     err_append "Wireless association failed."
  24     return 1
  25 }
  26
  27 # Check if a particular network is within range
  28 # find_essid interface essid
  29 find_essid()
  30 {
  31     INTERFACE=$1; ESSID=$2; RETRIES=4
  32     try=0;
  33     while [[ $try -ne $RETRIES ]]; do
  34         if iwlist $INTERFACE scan|sed "s/ESSID://g"|grep -q "\"$ESSID\""; then
  35             return 0 # network found
  36         fi
  37         sleep 0.5
  38         let try++
  39     done
  40     return 1
  41 }
  42
  43 # Return a filename containing a list of network ESSID's found.
  44 # list_networks interface
  45 list_networks()
  46 {
  47     # temp file used, as keeping ESSID's with spaces in their name in arrays
  48     # is hard, obscure and kinda nasty. This is simpler and clearer.
  49
  50     [[ -z "$1" ]] && return 1
  51     essids=$(mktemp /tmp/essid.XXXXX)
  52
  53     let try=0;
  54     RETRIES=6;
  55     while [[ $try -ne $RETRIES ]]; do
  56         iwlist $1 scan 2> /dev/null|grep ESSID|sed 's/.*ESSID:"\([^"]\+\)".*/\1/' > $essids
  57         sleep 0.5; let try++
  58     done
  59     sort -u $essids -o $essids
  60
  61     # File of 0 length, ie. no ssid's.
  62     if [[ ! -s $essids ]]; then
  63         return 1
  64     fi
  65
  66     echo $essids
  67     return 0
  68 }
  69
  70 wirelessral_up() {
  71
  72     load_profile $1
  73
  74     if [[ ! -d /sys/class/net/$INTERFACE/wireless ]]; then
  75         err_append "Interface $INTERFACE is not a wireless interface"
  76         return 1
  77     fi
  78
  79     # Required by ralink to enable device
  80     ifconfig $INTERFACE up
  81
  82     # Helps ralink finding networks faster
  83     iwlist $INTERFACE scan &> /dev/null
  84
  85     # Ensure we are not in monitor mode and start finding the essid
  86     eval "iwconfig $INTERFACE mode managed essid \"$ESSID\""
  87
  88     if checkyesno $SCAN; then
  89         if ! find_essid $INTERFACE "$ESSID"; then
  90             err_append "Network unavailable"
  91             return 1
  92         fi
  93     fi
  94
  95     case $SECURITY in
  96     wep|none)
  97         # 'none' security uses iwconfig, like wep, so use same code, minus keysetting.
  98         # Use sane default if no alternative is specified
  99         if [[ "$SECURITY" = "wep" && "$WEP_OPTS" = "" ]]; then
 100             WEP_OPTS="mode managed essid \"$ESSID\" key open $KEY"
 101         elif [[ "$SECURITY" = "none" && "$WEP_OPTS" = "" ]]; then
 102             WEP_OPTS="mode managed essid \"$ESSID\""
 103         fi
 104
 105         if ! eval iwconfig $INTERFACE $WEP_OPTS; then
 106             err_append "Could not set wireless configuration"
 107             return 1
 108         fi
 109
 110         wep_check $INTERFACE $TIMEOUT|| return 1
 111         ;;
 112     wpa)
 113         # Temporary bugfix for broken drivers... http://bbs.archlinux.org/viewtopic.php?id=36384
 114         if ! eval iwconfig $INTERFACE mode managed essid "\"$ESSID\""; then
 115             err_append "Could not set wireless configuration"
 116             return 1
 117         fi
 118
 119         if ! iwpriv $INTERFACE set AuthMode=WPAPSK; then
 120             err_append "Could not set interface in WPA mode"
 121             return 1
 122         fi
 123
 124         if [ -z "$ENCRYPTYPE" ]; then
 125             ENCRYPTYPE="TKIP"
 126         fi
 127
 128         if ! iwpriv $INTERFACE set EncrypType=$ENCRYPTYPE; then
 129             err_append "Could not set $ENCRYPTYPE encryption"
 130             return 1
 131         fi
 132
 133         if ! iwpriv $INTERFACE set "WPAPSK=$KEY"; then
 134             err_append "Could not set encryption key"
 135             return 1
 136         fi
 137
 138         # Use same check as WEP - we are using wireless_tools
 139         wep_check $INTERFACE $TIMEOUT || return 1
 140         ;;
 141     wpa-config)
 142         err_append "wpa-config option not implemented"
 143         return 1
 144         ;;
 145     esac
 146
 147     . $SUBR_DIR/ethernet.subr
 148     if ! ethernet_up $1; then
 149         wirelessral_down $1 YES
 150         return 1
 151     fi
 152 }
 153
 154 wirelessral_down() {
 155     PROFILE=$1 NOETHERNETDOWN=$2
 156     if ! checkyesno $2; then
 157         . $SUBR_DIR/ethernet.subr
 158         ethernet_down $1
 159        fi
 160     iwconfig $INTERFACE essid off key off &> /dev/null
 161     #ifconfig $INTERFACE down
 162 }
 163
 164 wirelessral_clean_scope() {
 165     unset INTERFACE CONNECTION
 166     unset TIMEOUT WPA_CONF WPA_OPTS KEY ESSID SECURITY WEP_OPTS ENCRYPTYPE
 167     . $SUBR_DIR/ethernet.subr
 168     ethernet_clean_scope
 169 }
 170
 171
 172 # vim: set ts=4 et sw=4: