WifiTagger is a device to tag wifi networks. It can broadcast up to four lines of 32 characters. Upon selecting a tag (SSID) as your network, you can tag the wifi spectrum via the WifiTagger's web interface. Tags will be viewable within the list of wifi networks for anyone within the router's range. WifiTagger lets anyone with a wifi enabled device tag digital space.

Setup Process

1. buy a TP-Link TL-WR741ND WiFi Router ($25)
2. flash firmware
3. setup ssh and login password (e.g: sexylama)
4. run setup.sh (chmod +x setup.sh; ./setup.sh)
5. restart access point
6. connect to "Free Public WifiTagger"
7. DONE! open any url (it's a captive portal) and start tagging

More on Flashing Firmware

• plugin router to ethernet (not wan port)
• open web interface at http://192.168.0.1/ or http://192.168.1.1/
  • user: admin
  • password: admin
• restore factory settings if anythings was changed
• run "system upgrade" uploading new wifitagger (OpenWRT) firmware
  • openwrt-ar71xx-generic-tl-wr741nd-v4-squashfs-factory.bin
• after about 3 minutes continue with ssh setup

More on Seting up SSH

• after falshing the firmware you can "telnet 192.168.1.1" and
• set a password with "passwd"
• this will disable telnet and enable ssh login "ssh [email protected]"
• if you have problems with keys/hosts use this ssh option "-o UserKnownHostsFile=/dev/null"

More on Running setup.sh

• this will copy a bunch of files to the router
• amoung them setup_remote.sh
• which it will then also execute
• the setup.sh will require you to login a couple of times

Troubleshooting

• if something doesn't work ssh to router and
• run commands in setup_remote.sh manually
• check output for errors

Resources

• OpenWRT: http://openwrt.org/
• Hacking Guide: http://wiki.openwrt.org/toh/tp-link/tl-wr741nd
• Firmware: http://downloads.openwrt.org/attitude_adjustment/12.09-beta2/ar71xx/generic/
• Packages: http://downloads.openwrt.org/attitude_adjustment/12.09-beta2/ar71xx/generic/packages/

Old Notes

shell

• ssh [email protected]
• remotely execute stuff
  • ssh [email protected] 'cd /www/; mkdir images;'
• copy stuff
  • scp index.lua [email protected]:/www/
• disk info
  • df -h
• uci ... general configuration see: http://wiki.openwrt.org/doc/uci
• enable wifi
  • uci set wireless.@wifi-device[0].disabled=0
• login without host key verification
  • ssh -o UserKnownHostsFile=/dev/null [email protected]

Upgrade Firmware

• copy firmware with "sysupgrade" suffix to /tmp on router
• rename to tplink.bin
• run "mtd -r write /tmp/tplink.bin firmware"

Install Lua Webserver stuff (latest firmware includes this)

• liblua
• lua
• uhttpd - http://wiki.openwrt.org/doc/uci/uhttpd
  • /etc/init.d/uhttpd enable
  • /etc/init.d/uhttpd start
• [uhttpd-mod-lua]
• luci-lib-core - https://luci.subsignal.org/trac/browser
  • libuci-lua
• luci-lib-web
  • luci-lib-sys
  • luci-lib-nixio
  • luci-lib-lmo
  • luci-sgi-cgi
    • [luci-sgi-uhttpd - /usr/lib/lua/luci/sgi/uhttpd.lua]
• [luci-lib-json]

docs

• http://luci.subsignal.org/api/luci/
• http://luci.subsignal.org/api/nixio/
• scp lua_5.1.4-8_ar71xx.ipk [email protected]:/root/

setting up uhttp-mod-lua

• opkg install uhttpd-mod-lua
• uci set uhttpd.main.lua_prefix=/ ... using root disable statis file served
• uci set uhttpd.main.lua_handler=/www/index.lua
• uci commit uhttpd ... make changed persistent after reboot
• /etc/init.d/uhttpd restart
• wget -qO- http://127.0.0.1/

index.lua

function handle_request(env) uhttpd.send("HTTP/1.0 200 OK\r\n") uhttpd.send("Content-Type: text/plain\r\n\r\n") uhttpd.send("Hello world.\n") end

wireless stuff

• config file
  • /etc/config/wireless
• restart network
  • /etc/init.d/network restart
• using uci
  • uci get wireless.@wifi-iface[0].ssid
  • uci set wireless.@wifi-iface[0].ssid="What up?"
  • uci commit wireless

More package info

• luci-lib-core /usr/lib/lua/luci/store.lua /usr/lib/lua/luci/fs.lua /sbin/luci-reload /usr/lib/lua/luci/model/network.lua /usr/lib/lua/luci/ip.lua /usr/lib/lua/luci/debug.lua /usr/lib/lua/luci/util.lua /etc/config/ucitrack /usr/lib/lua/luci/ltn12.lua /usr/lib/lua/luci/ccache.lua /usr/lib/lua/luci/model/uci.lua /usr/lib/lua/luci/init.lua /usr/lib/lua/luci/version.lua /usr/lib/lua/luci/model/firewall.lua

CAPTIVE PORTAL

Use dnsmsqr to wildcard all domains to the routers IP. In "/etc/dnsmasq.conf" add "address=/#/192.168.1.1" and restart dnsmasq. The "#" could also be a "com" to reroute all .com domains.

Typical HTTP HEADER

DOCUMENT_ROOT='/www' GATEWAY_INTERFACE='CGI/1.1' HTTP_ACCEPT='text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8' HTTP_ACCEPT_ENCODING='gzip, deflate' HTTP_ACCEPT_LANGUAGE='en-US,en;q=0.5' HTTP_CONNECTION='keep-alive' HTTP_COOKIE='SessionID_R3=0; FirstMenu=Admin_9; SecondMenu=Admin_9_1; ThirdMenu=Admin_9_1_0; Language=de' HTTP_HOST='192.168.1.1' HTTP_USER_AGENT='Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:17.0) Gecko/17.0 Firefox/17.0' IFS=' ' OPTIND='1' PATH='/sbin:/usr/sbin:/bin:/usr/bin' PPID='1050' PS1='\w $ ' PS2='> ' PS4='+ ' PWD='/www' QUERY_STRING='' REDIRECT_STATUS='200' REMOTE_ADDR='192.168.1.211' REMOTE_HOST='192.168.1.211' REMOTE_PORT='56381' REQUEST_METHOD='GET' REQUEST_URI='/cgi-bin/print_env.sh' SCRIPT_FILENAME='/www/cgi-bin/print_env.sh' SCRIPT_NAME='/cgi-bin/print_env.sh' SERVER_ADDR='192.168.1.1' SERVER_NAME='192.168.1.1' SERVER_PORT='80' SERVER_PROTOCOL='HTTP/1.1' SERVER_SOFTWARE='uHTTPd'