iptables-lite

A lightweight firewall for nuttx

Prerequisites

The first step to get started with NuttX is to install a series of required tools. They can be found here.

Initialize Configuration

The first step is to initialize NuttX configuration for a given board, based from a pre-existing configuration.

$ cd nuttx
$ ./tools/configure.sh -l sim:nsh

The -l tells use that we’re on Linux (macOS and Windows builds are possible). Use the -h argument to see all available options.

Build NuttX

We can now build NuttX. To do so, you can simply run:

$ cd nuttx
$ make

Run the Simulator

$ ./nuttx
login: admin
password: Administrator

Run the Network Simulator

make distclean
./tools/configure.sh -l sim:tcpblaster
make

On recent Linux distributions, you need to give the nuttx program the capabilities (similar to permissions) to access the network:

sudo setcap cap_net_admin+ep ./nuttx

Bring Up the Network Interfaces On Apache NuttX:

nsh> ifup eth0

Then, on Linux do this to set up the tap network interface and route that will let the Apache NuttX simulator access the network:

sudo ./tools/simhostroute.sh enp0s3 on

If you use ifconfig, you'll se that enp0se is the wireless interface. Note that it has an IP address on the local net. There may be other interfaces listed, you’ll need to pick the one that’s right for your system.

Run the Netcat

netcat -l -p 31337

Debugging with GDB

Initiate a nuttx process:

./nuttx

Collect the process PID:

ps aux | grep nuttx

Start GDB with this process id:

sudo gdb -p {pid}

Set breakpoints and continue to debugging:

(gdb) break file:lineno
(gdb) continue

Up interface eth0:

nsh > ifup eth0

Ping to linux:

nsh > ping -c 1 {ip_linux}

Got any trouble? Check the official NuttX quickstart guide: http://nuttx.incubator.apache.org/docs/latest/quickstart/index.html

duduita/iplite