By Meghna Gangwar
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In this module, we will have a look at how we can host a web server on Android and port forward it using ngrok so that we can have a flexible webserver on the go.
Let’s get right into the steps to host a web server on our Android devices now.
First, we will need two Applications before we continue on : Termux (which will help us issue commands) and Hacker’s Keyboard (which will help us to use keys like Ctrl, Esc, Alt which are usually not available on standard Android Keyboards)
You can install Hacker’s Keyboard as well for better navigation within the Termux window.
Now we need to install some of the packages we require on Termux. Open the app and type in the following commands :
$ pkg update && pkg upgrade
This should upgrade our current system. Next up we will need to install some necessary packages with :
$ pkg install apache2 git neovim wget curl
Note that this section is completely optional. Here we will install some additional packages just to aid us during the whole process:
$ pkg install openssh neofetch fish nmap
First let’s enable ssh so that we can connect to our phone via our PC by :
Next, check your username and IP with ifconfig:
$ whoami u0_a147 $ ifconfig wlan0 wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.105 netmask 255.255.255.0 broadcast 192.168.0.255 inet6 fe80::ce9f:7aff:fe81:3115 prefixlen 64 scopeid 0x20<link> unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 3000 (UNSPEC) RX packets 227165 bytes 311846650 (297.4 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 82264 bytes 7912862 (7.5 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Now we need to check which port the SSH service is running. You can check it with:
$ nmap -sV 127.0.0.1 Starting Nmap 7.91 ( https://nmap.org ) at 2021-03-12 14:44 IST Nmap scan report for localhost (127.0.0.1) Host is up (0.0075s latency). Not shown: 999 closed ports PORT STATE SERVICE VERSION 8022/tcp open ssh OpenSSH 8.4 (protocol 2.0) Service detection performed. Please report any incorrect results at https://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 4.87 seconds
Once you have the Port Number, switch over to your PC and connect to your device with :
$ ssh -p <PORT> <USER>@<IP>
For example, for me, the complete command would be :
$ ssh -p 8022 firstname.lastname@example.org
Next up change the default shell with :
$ chsh /data/data/com.termux/files/usr/bin/fish
At this point, you can issue commands to your device from the terminal of your PC
Now, we can start our server with:
By default, the webpage is hosted on port 8080. Visiting the said port on our browser, we find the following message :
To edit the message we need to change the index.html file with the vi editor:
$ vi $PREFIX/share/apache2/default-site/htdocs/index.html
Let’s change the contents of index.html to :
Refreshing the page, we should now see our changes being reflected :
At this point, you can customize your page to look/do whatever you want it to do. However, to extend our functionality even further, we can enable port forwarding with ngrok !
First, we need to get the compressed file from the offical website with :
$ wget https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-arm64.tgz
Unzip the file with :
$ tar -xvzf ngrok-stable-linux-arm64.tgz
Next up, you need to sign up on their website to get an authorization token.
Now, you should get an authorization toke. To add the token to the default config file, type in :
$ ./ngrok authtoken <token>
Now, we should have access more features and longer sessions. Finally with our webserver still running, type :
$ ./ngrok http 8080
We get a ngrok link, where we would find our webserver’s homepage :
Now, we need can access our server from outside our local network using the ngrok link !
Thus in this way, we can use our Android phones as web servers. On non-rooted phones, you can host a webserver on any of the higher ports while on rooted phones you can use the default port 80.
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