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Use port under 1024

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joanpuigsanz edited this page Jul 24, 2013 · 4 revisions

ServDroid (v0.2 and above) is able to open a socket under port 1024. This text explains how to use this feature.

Requirements

ServDroid needs the following:

  • A rooted device.
  • The iptables command.
  • Android applications are not allowed to open ports under 1024, so ServDroid uses the command iptables (nat option) to create a bridge connection between the port X and the fixed port 65485.

How it works

For example, if servDroid is configured to run on port 80, it will execute the following command as a super user:

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 65485

And will open a socket using java on port 65485.

When the server is stopped, it cleans the iptables nat table.

Configuring the server to run under 1024 port

To configure the server is simple, just go to Preferences --> Port and write a port under 1024. Then ServDroid will check if the device has the minimum requirements or not.

Opening the ports under 1024 using the console

It is possible to open port under 1024 if your device has the needed requirements. If you want to open a port using console just use the following command line as a super user:

iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080

Finally you just need to configure the server to run on port 8080

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