Wifiweasel

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script to Auto connect to Open 802.11 wireless AP's
 
script to Auto connect to Open 802.11 wireless AP's
 
====wifiweasel====
 
====wifiweasel====
wifiweasel v1 -  
+
wifiweasel v1.5 -  
 
once run this script takes control of the wireless interface, then
 
once run this script takes control of the wireless interface, then
 
detects and connects to strongest open wifi AP in the vicinity.  
 
detects and connects to strongest open wifi AP in the vicinity.  

Revision as of 00:14, 23 July 2008

script to Auto connect to Open 802.11 wireless AP's

Contents

wifiweasel

wifiweasel v1.5 - 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 (needs to be tested with multiple AP's - might have an iwconfig essid glitch).

 
#!/bin/sh
   #####################
###########################
#/var/wifi/hacker/kd8ikt###
# OMG i'm programming now!#
###########################
###we.trekbeyond.org#######
  #####################
        #KISS#

# CONFIG
#######interface################
IFACE=eth0 
#Dhcp_timeout
DHCP=4
#check connectivity every X sec
X=15
#
# /CONFIG
################################
#### Scan Funk ####
Func_iwlist_open () {
echo scanning wifi ;
iwlist $IFACE scanning | awk -F '[ :=]+' '/(ESS|Freq|Qual)/{ printf $3" " } /Encr/{ print $4 }' \
    | sort -k4 -k3nr |grep -m1 off \
|awk '{print $1}' > /tmp/weasel
cat /tmp/weasel |grep '"' -m1 > /tmp/weasel_
sed /\"/s/\"//g /tmp/weasel_ > /tmp/ESSID
}
#### iface up Funk ######## 
Func_ifconfig_up () {
echo ; bring up interface
iwconfig $IFACE essid `cat /tmp/ESSID` 
}
#### iface down Funk #####
Func_ifconfig_down () {
echo killing iface and udhcpc
killall udhcpc 
ifconfig $IFACE down	
}
#### Conn Funk #####
Func_chk_net ()	{
echo checking...   
ping -w 2 -c1  $dns 
if [ $=0 ];then ERROR=0; echo; echo Online!  go download some pr0n ; echo; sleep $X; Func_chk_net ; 
fi  #W00T  
if [ $=1 ] ; then ERROR=1 ;echo ;echo FAIL!\ 
... Searching ; Func_Main ;
fi 
 }
#### Main Funk #########
Func_MAIN () { while [ ERROR=1 ] ; do
echo prime directive
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up ;
timeout $DHCP udhcpc $IFACE ;
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
Func_chk_net ;
Func_MAIN ;
done; 
} 
#### MAIN #### 
echo 1st run
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up  ; 
udhcpc $IFACE ; 
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
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#########################################

timeout

Added a timeout script to keep udhcpc from hanging up everything. As we all know, dhcp should not take 60sec; if it's not obtained a reply or a lease within a few seconds, you are likely not going to obtain an IP (perhaps due to range issues, mac filtering, etc).

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 "$@"

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

script to Auto connect to Open 802.11 wireless AP's

wifiweasel

wifiweasel v1 - 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 (needs to be tested with multiple AP's - might have an iwconfig essid glitch).

 
#!/bin/sh
   #####################
###########################
#/var/wifi/hacker/kd8ikt###
# OMG i'm programming now!#
###########################
###we.trekbeyond.org#######
  #####################
        #KISS#

# CONFIG
#######interface################
IFACE=eth0 
#Dhcp_timeout
DHCP=4
#check connectivity every X sec
X=15
#
# /CONFIG
################################
#### Scan Funk ####
Func_iwlist_open () {
echo scanning wifi ;
iwlist $IFACE scanning | awk -F '[ :=]+' '/(ESS|Freq|Qual)/{ printf $3" " } /Encr/{ print $4 }' \
    | sort -k4 -k3nr |grep -m1 off \
|awk '{print $1}' > /tmp/weasel
cat /tmp/weasel |grep '"' -m1 > /tmp/weasel_
sed /\"/s/\"//g /tmp/weasel_ > /tmp/ESSID
}
#### iface up Funk ######## 
Func_ifconfig_up () {
echo ; bring up interface
iwconfig $IFACE essid `cat /tmp/ESSID` 
}
#### iface down Funk #####
Func_ifconfig_down () {
echo killing iface and udhcpc
killall udhcpc 
ifconfig $IFACE down	
}
#### Conn Funk #####
Func_chk_net ()	{
echo checking...   
ping -w 2 -c1  $dns 
if [ $=0 ];then ERROR=0; echo; echo Online!  go download some pr0n ; echo; sleep $X; Func_chk_net ; 
fi  #W00T  
if [ $=1 ] ; then ERROR=1 ;echo ;echo FAIL!\ 
... Searching ; Func_Main ;
fi 
 }
#### Main Funk #########
Func_MAIN () { while [ ERROR=1 ] ; do
echo prime directive
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up ;
timeout $DHCP udhcpc $IFACE ;
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
Func_chk_net ;
Func_MAIN ;
done; 
} 
#### MAIN #### 
echo 1st run
Func_ifconfig_down ;
Func_iwlist_open Func_ifconfig_up  ; 
udhcpc $IFACE ; 
export dns=`cat /etc/resolv.conf |grep name |awk '{print $2}'`
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#########################################

timeout

Added a timeout script to keep udhcpc from hanging up everything. As we all know, dhcp should not take 60sec; if it's not obtained a reply or a lease within a few seconds, you are likely not going to obtain an IP (perhaps due to range issues, mac filtering, etc).

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 "$@"

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