We got many keys for some wifi APs around, so we put them in a delimited text file like:
\nap8599:5537801570
\nsd6980:5202140314
\nwq0858:5953230520
\nnow, when we are around, we want a script that we can tell: “connect to ap6980 if you see it around, if you
\nneed a key, take it from the text file”. Called without arguments, it scans all available networks, and tries to
\nconnect to all of the ones that we have a key or that are open.
\nThis is our connection script:
\n#!\/bin\/bash
\nap=$@
\ni=wlan0
\nen=0
\n#——————————————————————————————————————
\n# Scan for wireless networks, and pretty print the quality, the essid, and if we require encryption
\n#—————————————————————————————————————–
\nscanw () {
\ni=$1
\n( ifconfig $i up
\niwlist $i scan | egrep -i ‘essid|freq|qual|encr’ |nawk ‘ORS=NR%4?” “:”n”‘| tr -s ‘ ‘| while read l;do
\nAP=`echo “$l “|awk ‘{s=substr($0,index($0,”ESSID:”) +7);print substr(s,1,index (s,”””)-1)}’`
\nEN=`echo “$l “|awk ‘{s=substr($0,index($0,”Encryption key:”)+15);print substr(s,1,index (s,” “)-1)}’`
\nQU=`echo “$l “|awk ‘{s=substr($0,index($0,”Quality=”)+8);print substr(s,1,index (s,”\/”)-1)}’`
\nK=`grep “^$AP” keys.txt| awk -F’:’ ‘{ print $2 }’`
\necho “$QU:$EN:$AP:$i: $K”
\ndone
\n) | sort -n
\n}
\n#—————————————————————————————————————–
\n# Connect to the accespoint determined by the “$ap” variable
\n#—————————————————————————————————————–
\nconn(){
\nL=`grep -i “$ap” ~\/keys.txt| head -1`
\nC=`echo -n $L | wc -c`
\nindb=1
\nif [ $C -lt 1 ];then
\n40\/433
\n# echo “————- WARNING: AP $ap not found in database”
\nindb=0
\nfi
\nS=`grep “$ap” \/tmp\/scan.$$|wc -c`
\nif [ $S -lt 1 ];then
\necho “————- ERROR: AP $ap is not in range, cannot connect”
\nexit 1
\nfi
\nif [ $indb -eq 1 ];then
\n#—if we found an accesspoint in our database work with it
\nAP=`echo $L | awk -F’:’ ‘{ print $1 }’`
\nK=`echo $L | awk -F’:’ ‘{ print $2 }’`
\necho “————- Connecting to $AP with key $K”
\niwconfig $i mode managed key $K essid “$AP” rate auto
\nelse
\nAP=`grep “$ap” \/tmp\/scan.$$|awk -F’:’ ‘{ print $3 }’`
\nen=`grep “$AP” \/tmp\/scan.$$|awk -F’:’ ‘{ print $2 }’`
\nif [ $en == “off” ];then
\necho “————- Connecting to $AP without key”
\niwconfig $i mode managed key off essid “$AP” rate auto
\nelse
\necho “———— ERROR: Encryption needed for $AP but i don’t have the key”
\nreturn 1
\nfi
\nfi
\nx=0
\necho -n “————- Associating with $AP”
\nwhile [ $x -lt 10 ];do
\nA=`iwconfig $i | grep -i ‘Not-Associated’|wc -c`
\nif [ ${A} -eq 0 ];then
\necho “”;echo “————- Associated to $AP !!!”
\ndhclient -q -r $i
\ndhclient $i
\nexit 0
\nelse
\necho -n “.”
\nfi
\nsleep 1
\nx=`echo “$x + 1” | bc`
\ndone
\necho “”;echo “————- ERROR: Could not associate”
\n}
\n#——————————————————————————————————————-
\n# Connect to any accesspoint we can sniff
\n#——————————————————————————————————————-
\nauto () {
\ncat \/tmp\/scan.$$ | awk -F’:’ ‘{ print $3 }’ |while read ap;do
\necho “———- trying to connect to $ap”
\nconn $ap
\ndone
\n}
\n#——————————————————————————————————————-
\n# Main
\n41\/433
\n#——————————————————————————————————————-
\nifconfig -a | egrep -i ‘mon|wlan’ | awk ‘{ print $1 }’ |while read i;do airmon-ng stop $i; done > \/dev\/null 2>&1
\nifconfig $i down
\nifconfig $i up
\nscanw $i > \/tmp\/scan.$$
\ncat \/tmp\/scan.$$
\nif [ $# -lt 1 ];then
\necho “——– WARNING: no Accesspoint specified, will try to connect to the ones i see alive”
\nauto
\nelse
\nconn
\nfi
\nrm \/tmp\/scan.$$
\nScan for wireless accesspoints, parse the output
\nso, iwlist throws its output in different order depending of the wifi nic, so we need to scan and parse, to see 3 columns:
\nsignal strength: encryption needed: ESSID
\n27:on:CASA
\n27:on:AP1133
\n30:on:CC5763
\n32:on:XX1330
\n36:off:gg54g
\nSo, we wrote a script called “scan” that loops to all wlan interfaces and scans for APs.
\n#!\/bin\/bash
\nifconfig -a |grep -i wlan | awk ‘{ print $1 }’|while read i;do
\necho “#—- scanning on $i”
\n( ifconfig $i up
\niwlist $i scan | egrep -i ‘essid|freq|qual|encr’ |nawk ‘ORS=NR%4?” “:”n”‘| tr -s ‘ ‘| while read l;do
\nAP=`echo “$l “|awk ‘{s=substr($0,index($0,”ESSID:”) +7);print substr(s,1,index (s,”””)-1)}’`
\nEN=`echo “$l “|awk ‘{s=substr($0,index($0,”Encryption key:”)+15);print substr(s,1,index (s,” “)-1)}’`
\nQU=`echo “$l “|awk ‘{s=substr($0,index($0,”Quality=”)+8);print substr(s,1,index (s,”\/”)-1)}’`
\necho “$QU:$EN:$AP”
\ndone
\n) | sort -n
\ndone
\n42\/433<\/p>\n","protected":false},"excerpt":{"rendered":"
We got many keys for some wifi APs around, so we put them in a delimited text file like: ap8599:5537801570 sd6980:5202140314 wq0858:5953230520 now, when we are around, we want a script that we can tell: “connect to ap6980 if you see it around, if you need a key, take it from the text file”. Called […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-444","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"\/blog\/index.php\/wp-json\/wp\/v2\/posts\/444","targetHints":{"allow":["GET"]}}],"collection":[{"href":"\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=444"}],"version-history":[{"count":0,"href":"\/blog\/index.php\/wp-json\/wp\/v2\/posts\/444\/revisions"}],"wp:attachment":[{"href":"\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=444"},{"taxonomy":"post_tag","embeddable":true,"href":"\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}