Wifiweasel

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FAIL

script to Auto connect to Open 802.11 wireless AP's

wifiweasel

wifiweasel v2 - once run this script takes control of the wireless interface, then detects and connects to strongest open wifi AP in the vicinity. Subsequently it checks the connectivity every X seconds. If the connection fails, the whole process repeats itself; this requires the timeout script below

 
#!/bin/sh
####### WifiWeasel ###### Ver. 2
######################### 08-07-22
##        kd8ikt       ##
##  we.trekbeyond.org  ##
#########################
#########################
#
#install /usr/bin/wifiweasel
#
#Variables
IFACE=eth0
DHCP_TIMEOUT=5       # requires /usr/bin/timeout
CHECK_NET_TIMER=15   #secs
TEMPDIR=/tmp/wifiweasel/
#
#Functions
#
#(dont touch unless you 
#know wtf your doing
#
#### Scan Funk
Func_iwlist_open () {
iwlist $IFACE scanning | awk -F '[ :=]+' '/(ESS|Freq|Qual)/{ printf $3" " } /Encr/{ print $4 }' \
    | sort -k4 -k3nr |grep -m1 off \
|awk '{print $1}' > /tmp/wifiweasel/scan
cat $TEMPDIR/scan |grep '"' -m1 > $TEMPDIR/scan1
sed /\"/s/\"//g $TEMPDIR/scan1 > $TEMPDIR/ESSID
echo 
echo Using ESSID
cat $TEMPDIR/ESSID
echo
}
#### interface down Funk
Func_ifconfig_down () {
killall udhcpc 
ifconfig $IFACE down
}
#### iface up Funk
Func_ifconfig_up () {
ifconfig $IFACE up
iwconfig $IFACE essid `cat $TEMPDIR/ESSID` 
}
#### Connection check Funk
Func_chk_net ()	{
echo checking...   
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
timeout 1 nslookup  $dns 
if [ $? = 0 ];then ERROR=0; echo; echo Online!  W00T ; echo ;echo using essid ; cat $TEMPDIR/ESSID ; sleep $CHECK_NET_TIMER ; Func_chk_net ; 
fi  #W00T
if [ $? -ge 1] ; then ERROR=1 ;echo ;echo FAIL!\ 
... Searching ; echo ; Func_Main ;
fi 
}
#### Main loop Funk
Func_MAIN () { while [ ERROR=1 ] ; do
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up ;
timeout $DHCP_TIMEOUT udhcpc $IFACE ;
Func_chk_net ;
Func_MAIN ;
done; 
}
#Prep 
mkdir $TEMPDIR
touch $TEMPDIR/scan
touch $TEMPDIR/scan1
touch $TEMPDIR/ESSID
# RunProgram
Func_ifconfig_down 
Func_iwlist_open Func_ifconfig_up 
timeout $DHCP_TIMEOUT udhcpc $IFACE 
Func_chk_net  
Func_MAIN 
echo This is the end, my only friend the end
Done; #actually i dont think it ever ends but i'm done writing it
#####################EOF#EOF#EOF#EOF#EOF#EOF#EOF#EOF#EOF#########

timeout

Added a timeout script to keep udhcpc from hanging everything. As we all know, dhcp should not take 60sec
INSTALL /usr/bin/timeout

#Newsgroups: comp.unix.admin,comp.unix.solaris,comp.unix.shell
#From: gwc@root.co.uk (Geoff Clare)
#Subject: Re: timeout -t <sec> <unix command> (Re: How to give rsh a shorter timeout?)
#Message-ID: <EoBxrs.223@root.co.uk>
#Date: Fri, 13 Feb 1998 18:23:52 GMT

#
# Conversion to bash v2 syntax done by Chet Ramey <chet@po.cwru.edu
# UNTESTED
#

prog=${0##*/}
usage="usage: $prog [-signal] [timeout] [:interval] [+delay] [--] <command>"

SIG=-TERM       # default signal sent to the process when the timer expires
timeout=60      # default timeout
interval=15     # default interval between checks if the process is still alive
delay=2         # default delay between posting the given signal and
                # destroying the process (kill -KILL)

while :
do
        case $1 in
        --)     shift; break ;;
        -*)     SIG=$1 ;;
        [0-9]*) timeout=$1 ;;
        :*)     EXPR='..\(.*\)' ; interval=`expr x"$1" : "$EXPR"` ;;
        +*)     EXPR='..\(.*\)' ; delay=`expr x"$1" : "$EXPR"` ;;
        *)      break ;;
        esac
        shift
done

case $# in
0)      echo "$prog: $usage" >&2 ; exit 2 ;;
esac

(
        for t in $timeout $delay
        do
                while (( $t > $interval ))
                do
                        sleep $interval
                        kill -0 $$ || exit
                        t=$(( $t - $interval ))
                done
                sleep $t
                kill $SIG $$ && kill -0 $$ || exit
                SIG=-KILL
        done
) 2> /dev/null &

exec "$@"

comments

not sure but i think one has to make the /tmp/ files manually

  • fixed as of v2

sandbox

iwscan perl

#!/usr/bin/perl
# Tim Osburn - tim@osburn.com
#
# install perl

$iwlist = "/sbin/iwlist eth0 scanning";

open scan, "$iwlist |";
while (<scan>) {
  if (/^\s+Cell (\S+) - Address: (\S+)/) {
    $CELL=$1;
    $ADDRESS=$2;
    # print "$1 $2";
    $INLOOP=1;
    }
  if (/^\s+ESSID:(\S+)/) {
    $ESSID=$1;
    print " $1";
    }
  if (/^\s+Frequency:\S+ \S+ \(Channel (\S+)\)/) {
    $CHAN=$1;
    print " $1";
    }
  if (/^\s+Quality=\S+\s+Signal level=(\S+).*/) {
    $SIGNAL=$1;
    print " $1";
    }
  if (/^\s+Encryption key:(\S+)/) {
    $ENCRYPTION=$1;
    print " $1\n";
    }
  }
close scan;

produces output in the form of "essid" channel signal_strength encryption_status


"ESSID_NAME1" 1 -82 on
"ESSID_NAME2" 1 -49 off

Personal tools


FAIL

script to Auto connect to Open 802.11 wireless AP's

wifiweasel

wifiweasel v2 - once run this script takes control of the wireless interface, then detects and connects to strongest open wifi AP in the vicinity. Subsequently it checks the connectivity every X seconds. If the connection fails, the whole process repeats itself; this requires the timeout script below

 
#!/bin/sh
####### WifiWeasel ###### Ver. 2
######################### 08-07-22
##        kd8ikt       ##
##  we.trekbeyond.org  ##
#########################
#########################
#
#install /usr/bin/wifiweasel
#
#Variables
IFACE=eth0
DHCP_TIMEOUT=5       # requires /usr/bin/timeout
CHECK_NET_TIMER=15   #secs
TEMPDIR=/tmp/wifiweasel/
#
#Functions
#
#(dont touch unless you 
#know wtf your doing
#
#### Scan Funk
Func_iwlist_open () {
iwlist $IFACE scanning | awk -F '[ :=]+' '/(ESS|Freq|Qual)/{ printf $3" " } /Encr/{ print $4 }' \
    | sort -k4 -k3nr |grep -m1 off \
|awk '{print $1}' > /tmp/wifiweasel/scan
cat $TEMPDIR/scan |grep '"' -m1 > $TEMPDIR/scan1
sed /\"/s/\"//g $TEMPDIR/scan1 > $TEMPDIR/ESSID
echo 
echo Using ESSID
cat $TEMPDIR/ESSID
echo
}
#### interface down Funk
Func_ifconfig_down () {
killall udhcpc 
ifconfig $IFACE down
}
#### iface up Funk
Func_ifconfig_up () {
ifconfig $IFACE up
iwconfig $IFACE essid `cat $TEMPDIR/ESSID` 
}
#### Connection check Funk
Func_chk_net ()	{
echo checking...   
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
timeout 1 nslookup  $dns 
if [ $? = 0 ];then ERROR=0; echo; echo Online!  W00T ; echo ;echo using essid ; cat $TEMPDIR/ESSID ; sleep $CHECK_NET_TIMER ; Func_chk_net ; 
fi  #W00T
if [ $? -ge 1] ; then ERROR=1 ;echo ;echo FAIL!\ 
... Searching ; echo ; Func_Main ;
fi 
}
#### Main loop Funk
Func_MAIN () { while [ ERROR=1 ] ; do
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up ;
timeout $DHCP_TIMEOUT udhcpc $IFACE ;
Func_chk_net ;
Func_MAIN ;
done; 
}
#Prep 
mkdir $TEMPDIR
touch $TEMPDIR/scan
touch $TEMPDIR/scan1
touch $TEMPDIR/ESSID
# RunProgram
Func_ifconfig_down 
Func_iwlist_open Func_ifconfig_up 
timeout $DHCP_TIMEOUT udhcpc $IFACE 
Func_chk_net  
Func_MAIN 
echo This is the end, my only friend the end
Done; #actually i dont think it ever ends but i'm done writing it
#####################EOF#EOF#EOF#EOF#EOF#EOF#EOF#EOF#EOF#########

timeout

Added a timeout script to keep udhcpc from hanging everything. As we all know, dhcp should not take 60sec
INSTALL /usr/bin/timeout

#Newsgroups: comp.unix.admin,comp.unix.solaris,comp.unix.shell
#From: gwc@root.co.uk (Geoff Clare)
#Subject: Re: timeout -t <sec> <unix command> (Re: How to give rsh a shorter timeout?)
#Message-ID: <EoBxrs.223@root.co.uk>
#Date: Fri, 13 Feb 1998 18:23:52 GMT

#
# Conversion to bash v2 syntax done by Chet Ramey <chet@po.cwru.edu
# UNTESTED
#

prog=${0##*/}
usage="usage: $prog [-signal] [timeout] [:interval] [+delay] [--] <command>"

SIG=-TERM       # default signal sent to the process when the timer expires
timeout=60      # default timeout
interval=15     # default interval between checks if the process is still alive
delay=2         # default delay between posting the given signal and
                # destroying the process (kill -KILL)

while :
do
        case $1 in
        --)     shift; break ;;
        -*)     SIG=$1 ;;
        [0-9]*) timeout=$1 ;;
        :*)     EXPR='..\(.*\)' ; interval=`expr x"$1" : "$EXPR"` ;;
        +*)     EXPR='..\(.*\)' ; delay=`expr x"$1" : "$EXPR"` ;;
        *)      break ;;
        esac
        shift
done

case $# in
0)      echo "$prog: $usage" >&2 ; exit 2 ;;
esac

(
        for t in $timeout $delay
        do
                while (( $t > $interval ))
                do
                        sleep $interval
                        kill -0 $$ || exit
                        t=$(( $t - $interval ))
                done
                sleep $t
                kill $SIG $$ && kill -0 $$ || exit
                SIG=-KILL
        done
) 2> /dev/null &

exec "$@"

comments

not sure but i think one has to make the /tmp/ files manually

  • fixed as of v2

sandbox

iwscan perl

#!/usr/bin/perl
# Tim Osburn - tim@osburn.com
#
# install perl

$iwlist = "/sbin/iwlist eth0 scanning";

open scan, "$iwlist |";
while (<scan>) {
  if (/^\s+Cell (\S+) - Address: (\S+)/) {
    $CELL=$1;
    $ADDRESS=$2;
    # print "$1 $2";
    $INLOOP=1;
    }
  if (/^\s+ESSID:(\S+)/) {
    $ESSID=$1;
    print " $1";
    }
  if (/^\s+Frequency:\S+ \S+ \(Channel (\S+)\)/) {
    $CHAN=$1;
    print " $1";
    }
  if (/^\s+Quality=\S+\s+Signal level=(\S+).*/) {
    $SIGNAL=$1;
    print " $1";
    }
  if (/^\s+Encryption key:(\S+)/) {
    $ENCRYPTION=$1;
    print " $1\n";
    }
  }
close scan;

produces output in the form of "essid" channel signal_strength encryption_status


"ESSID_NAME1" 1 -82 on
"ESSID_NAME2" 1 -49 off