Wolf Paulus
Turning a WiFi Router into a
general-purpose Network Device

1. Hardware
2. Operating System
3. Runtime Environment

8 MB Flash
8 to 16 MB RAM
183 MHz CPU (MIPS)
1 Ethernet Port (10 / 100 Mbit/s)
Wireless: 802.11 b/g (54Mbit/s)
5V DC Power

FON 2201
FON 2100 FON 2202
US$ 43
US$ 29 US$ 49

Hardware
Hacking

USB to Serial Adapter
req. RS232 Level Shifter

1. Hardware
2. Operating System
3. Runtime Environment

Linux X-WRT
DD-WRT
OpenWrt
LuCI
FreeWRT
2004 . . . . . . .
Linksys WRT54G
Tomato
HyperWrt

HyperWrt based Tomato

OpenWrt w/ X-WRT

OpenWrt w/ LuCI

DD-Wrt

Linux X-WRT
DD-WRT
OpenWrt
LuCI
FreeWRT
2004 . . . . . . .
Linksys WRT54G
Tomato
HyperWrt

1. Tools for building linux kernel and root file system
2. Small BusyBox / Linux distribution
GPL licensed for embedded devices
3. Fully writable filesystem w/ package management
IPKG or OPKG (automatic dependencies)
4. UCI (universal configuration interface) for system
and package configuration

inary
le B
Sing

Fully writable filesystem w/
package management

Demo

Software
Hacking

1. Make rootfs and kernel available via TFTP
2. Gaining access to the Boot Loader
telnet 192.168.1.254 9000 ^C
3. Tell RedBoot the location of the tftp server
RedBoot> ip_address -l 192.168.1.254/24 -h 192.168.1.2
4. Initialize the Flash Memory Partition Table
Redboot> fis init
5. Load and write the root filesystem
RedBoot> load -r -b 0x80041000 openwrt-atheros-root.squashfs
RedBoot> fis create -l 0x06F0000 rootfs
6. Load and write the Linux kernel
RedBoot> load -r -b 0x80041000 openwrt-atheros-vmlinux.lzma
RedBoot> fis create -r 0x80041000 -e 0x80041000 vmlinux.bin.l7
7. Tell RedBoot which kernel to boot into
RedBoot> fis load -l vmlinux.bin.l7
8. Boot into the new System
RedBoot> exec

Partition Table

Demo

1. Hardware
2. Operating System
3. Runtime Environment

Target devices
CDC is intended for a broad range of resource-
constrained devices such as smartphones, TV set-
top boxes, telematics systems, and RFID readers.
Typically, these devices include a 32-bit
microcontroller and require about 2 MB of RAM
and 2.5 MB of ROM for the Java runtime
environment alone.
Relationship with Java SE
Each CDC version is based on a related Java SE
software version. CDC 1.1 is based on J2SE
version 1.4.2.

• Foundation Profile 1.1 (JSR 219)
• Core Java class library
• No GUI support
• Personal Basis Profile 1.1 (JSR 217)
• Lightweight component support
• xlet support
• Personal Profile 1.1 (JSR 216)
• Full AWT support
• Applet support
• CDC optional packages
• RMI, Security (HTTPS), JDBC, Swing, etc.

Core CDC Foundation Profile

Java (CDC) for OpenWrt
• Get the phoneME source from java.net
• Mod. the make file to point into the OpenWrt toolchain
• Run make in the OpenWrt SDK folder
• Run make in the linux-mips-openwrt folder
• Create the ipkg package structure
• Move the file structure into the OpenWrt toolchain
• Run make in the OpenWrt SDK folder

https://phoneme.dev.java.net/
• How to build phoneME for OpenWrt
• http://wolfpaulus.com/journal/embedded/fonera2.html
• How to build phoneME for Mac OS X
• http://markus.heberling.net/tag/phoneme/

Building with phoneME
javac
-source 1.4
-target 1.4 *.java
-classpath btclasses.zip:basis.jar
<javac srcdir=\"${src}\"
destdir=\"${build}\"
classpath=\"btclasses.zip:basis.jar\"
source=\"1.4\"
target=\"1.4\"
/>

Demo

Amazon Elastic Compute Cloud (Amazon EC2)
Google’s Application Engine
Managed Hosting
Enterprise
Computing Infrastructure
Home
Netbooks
Smart Phones ,TiVo, NetFlix Roku, AppleTV
Embedded Devices, Storage (Ext. HardDrives, Drobo)

Thanks for
coming
http://wolfpaulus.com
© 2003-2006 Carlsbad Cubes
© 2009 wolfpaulus.com