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*** Warnings ***
linux as host os is required, windows might be possible but is untested
You can easily destroy your emulator. Backup your emulator
Root access required
Preface
${android_sdk} refers to your android sdk root folder
Your emulator consists of three images:
- ${android_sdk}/tools/lib/images/ramdisk.img (cpio[cnew] archive, gzip compressed)
- ${android_sdk}/tools/lib/images/system.img (yaffs2 formated)
- ${android_sdk}/tools/lib/images/userdata.img (yaffs2 formated)
By now noone has managed to mounting the yaffs2 formated partitions. Loopback mounting does not work. So for now the best way to hack the emulator is ${android_sdk}/tools/lib/images/ramdisk.img
Step 0 - backup
| Code: |
| cp ${android_sdk}/tools/lib/images/ramdisk.img ${android_sdk}/tools/lib/images/ramdisk.img.old |
Step 1 - extracting the ramdisk
| Code: |
| mkdir ramdisk
cd ramdisk cat ${android_sdk}/tools/lib/images/ramdisk.img | gunzip | sudo cpio -i |
This will populate "ramdisk" with the ramdisks content.
Step 2 - looking at a simple boot skript
Android requires some special code to boot in the emulator, the code can be found in etc/qemu-init.sh
| Code: |
| sudo vim etc/qemu-init.sh |
Here is the original content:
| Code: |
| #!/system/bin/sh
# Some special case stuff for running under emulation qemu=`getprop ro.kernel.qemu` case "$qemu" in "1" ) ifconfig eth0 10.0.2.15 netmask 255.255.255.0 up route add default gw 10.0.2.2 dev eth0 radio_ril=`getprop ro.kernel.android.ril` case "$radio_ril" in ttyS*) # a modem is emulated as a serial device ;; *) # no need for the radio interface daemon # telephony is entirely emulated in Java setprop ro.radio.noril yes stop ril-daemon ;; esac setprop net.eth0.dns1 10.0.2.3 setprop net.gprs.local-ip 10.0.2.15 setprop ro.radio.use-ppp no setprop ro.config.nocheckin yes setprop status.battery.state Slow setprop status.battery.level 5 setprop status.battery.level_raw 50 setprop status.battery.level_scale 9 stop dund stop usbd ;; esac |
Step 3 - the target networking environment
Android is hardcoded to use 10.0.2.3 and 10.0.2.2 for comunication - especially with adb. You can not use anything except this userspace emulation for eth0.
Android
- device: eth0, ip: 10.0.2.15, net: 10.0.2.0/255.255.255.0 - this will keep adb happy
- device: eth1, ip: 192.168.1.2, net: 192.168.1.0/255.255.255.0 - this will be used for real communication
- default gateway: 192.168.1.1 - or whatever suits your network
- DNS: 10.0.2.3 - we simply keep this, no disadvantages except harder debugging
Host
- net_android, virtual android network device
- br0, network bridge linking eth0 and net_android
Depending on what you want to test you might want to turn your host system into a nat gateway, a dhcp server, transparent proxy, routing gateway or whatever you need.
Step 4 - altering the android network
| Code: |
| #!/system/bin/sh
# Some special case stuff for running under emulation qemu=`getprop ro.kernel.qemu` case "$qemu" in "1" ) if ifconfig eth1 up; then ifconfig eth1 down # Should we really check for eth1 that way? # DHCP - broken? # netcfg eth1 dhcp ifconfig eth1 192.168.1.2 netmask 255.255.255.0 up route add default gw 192.168.1.1 dev eth1 ifconfig eth0 10.0.2.15 netmask 255.255.255.0 up setprop net.eth0.dns1 10.0.2.3 setprop net.eth1.dns1 10.0.2.3 setprop net.gprs.local-ip 192.168.1.2 else ifconfig eth0 10.0.2.15 netmask 255.255.255.0 up route add default gw 10.0.2.2 dev eth0 setprop net.eth0.dns1 10.0.2.3 setprop net.gprs.local-ip 10.0.2.15 fi # Proxy support - broken too? # setprop net.gprs.http-proxy http://proxy:8080/ # No longer needed # ifconfig eth0 10.0.2.15 netmask 255.255.255.0 up # route add default gw 10.0.2.2 dev eth0 radio_ril=`getprop ro.kernel.android.ril` case "$radio_ril" in ttyS*) # a modem is emulated as a serial device ;; *) # no need for the radio interface daemon # telephony is entirely emulated in Java setprop ro.radio.noril yes stop ril-daemon ;; esac # no longer needed # setprop net.eth0.dns1 10.0.2.3 # setprop net.gprs.local-ip 10.0.2.15 setprop ro.radio.use-ppp no setprop ro.config.nocheckin yes setprop status.battery.state Slow # Interresting - is this the way to check battery status? setprop status.battery.level 5 setprop status.battery.level_raw 50 setprop status.battery.level_scale 9 stop dund stop usbd ;; esac |
This will keep your classic config if eth1 doesn't exist and if it exists adb will still work.
Step 5 - packing your new ramdisk
| Code: |
| sudo find | sudo cpio -o -H newc | gzip -9 > ${android_sdk}/tools/lib/images/ramdisk.img |
Step 6 - Host configuration
| Code: |
| sudo brctl addbr br0
sudo tunctl -u $USER -t net_android sudo ifconfig eth0 0.0.0.0 promisc up sudo ifconfig net_android 0.0.0.0 promisc up sudo brctl addif br0 eth0 sudo brctl addif br0 net_android sudo dhclient3 br0 |
Depending on you sodu configuration you might need to substitute $USER with your username. Depending on your local network you might need to substitute sudo dhclient3 br0 with your normal network initialization.
Step 7 - boot and test
| Code: |
| ${android_sdk}/tools/emulator -debug-kernel -qemu -net nic -net user -net nic -net tap,ifname=net_android |
Now on your host system do
| Code: |
| ping 192.168.2.2
adb shell |
If everything went well both commands will work.
Enjoy!
TODO1: Tutorial how to use the new network link from within dalvik.
TODO2: Find a windows user who will try the ramdisk with windows and openvpn/tun/tap driver
http://www.anddev.org/advanced_networking_with_android-linux-t155.html
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