注：本文旨在學習研究wifi熱點相關知識，請勿用於任何違反道德之事。
需要一台Root過的Android（系統版本不低於5.0）手機，安裝好Termux和python。實現Captive Portal需要兩部分，請求重定向和授權頁面。重定向的實現有多種，這裡既然是假熱點，所以使用最簡單的iptables重定向dns。授權頁面則直接採用jczic/MicroWebSrv實現的網頁服務器。把MicroWebSrv解壓到~/scripts/MicroWeb，然後新建如下文件
#~/scripts/MicroWeb/forward.sh
remove127(){
/system/bin/iptables -t nat -D PREROUTING -p tcp --dport 80 -j DNAT --to-destination 192.168.43.1:8000&&/system/bin/iptables -t nat -D PREROUTING -p tcp --dport 443 -j DNAT --to-destination 192.168.43.1:8000
}
add127(){
/system/bin/iptables -t nat -I PREROUTING -p tcp --dport 80 -j DNAT --to-destination 192.168.43.1:8000&&/system/bin/iptables -t nat -I PREROUTING -p tcp --dport 443 -j DNAT --to-destination 192.168.43.1:8000
}
if [[ $1 = "1" ]]; then
echo "start"
add127
elif [[ $1 = "0" ]]; then
echo "stop"
remove127
fi
#~/scripts/MicroWeb/web.py
from microWebSrv import MicroWebSrv
mws = MicroWebSrv(port=8000,bindIP='0.0.0.0',webPath="/data/data/com.termux/files/home/scripts/MicroWeb/www")
mws.SetNotFoundPageUrl("http://192.168.43.1:8000/hotspot-detect.html")
mws.Start(False)
#~/scripts/MicroWeb/www/hotspot-detect.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, height=device-height, user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0">
<meta name="format-detection" content="telephone=no">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="renderer" content="webkit|ie-comp|ie-stand">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<title>Captive Portal</title>
<script>
/*!
* clipboard.js v2.0.0
* https://zenorocha.github.io/clipboard.js
*
* Licensed MIT © Zeno Rocha
*/
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</script>
<style>
.wrapper {
text-align: center;
}
.button {
position: absolute;
top: 50%;
margin-top:2em;
}
</style>
</head>
<body>
<div class="wrapper">
<button class="btn" id="clickButton" data-clipboard-text="just kidding :)">
Connect to the Internet
</button>
</div>
<script>
var clipboard = new ClipboardJS('.btn');
clipboard.on('success', function(e) {
console.info('Action:', e.action);
console.info('Text:', e.text);
console.info('Trigger:', e.trigger);
e.clearSelection();
});
clipboard.on('error', function(e) {
console.error('Action:', e.action);
console.error('Trigger:', e.trigger);
});
</script>
</body>
</html>
上面文件唯一需要修改的地方是你手機的wifi網關，可以在打開手機熱點後通過ip addr命令查看，我的是wlan0網卡，網關是192.168.43.1。
#iptable需要root權限
su
./forward.sh 1
#然后新开一个session運行web server
python web.py
#這時其他手機連上此熱點，即會彈出自定義頁面hotspot-detect.html。
本文更新於 2018/11/02。