Instructions

You will need

• Wireshark
  • I used the bundled command line program tshark, but the same should be achievable using the graphical version as well
• Love Live! School Idol Festival on an Android device
  • I've only tested this on Android, I'm not sure if it'll work on iOS
• A PC or Mac with the ability to share a Wi-Fi network
  • It'll need to connect to the Internet through another means (e.g. an Ethernet cable) to leave the Wi-Fi free to share with the Android device

Steps

• Enable Internet Sharing on your PC or Mac, and connect your Android device to the PC's network
  • On macOS, this is in System Preferences > Sharing > Internet Sharing
• Start up Wireshark, connect to the interface that corresponds to the Android device, and start capturing packets
  • In my case, the interface was called ap1, but YMMV
• Open up LLSIF on your Android device, and click through to the home screen
• Wireshark should now have a bunch of packets displayed. In the Filter bar, filter the packets with json
• You should see a bunch of HTTP/JSON requests to http://prod-jp.lovelive.ge.klabgames.net/. Make a note of the Destination IP address
  • In my case, the destination IP address was 192.168.2.2
• Stop capturing packets in Wireshark, and close LLSIF
• Re-open LLSIF, but on the splash screen click the Clear Cache button, press OK/continue
  • The app will now clear out its caches and restart
  • Let it progress to the splash screen after restarting before continuing
• Run the command below
  • Remember to replace ap1 and 192.168.2.2

mkdir -p llsifwake/jsonfiles
cd llsifwake
path/to/tshark -i ap1 -f "dst host 192.168.2.2" -w outfile.pcapng --export-objects http,jsonfiles

• This starts capturing packets. Now press the LLSIF splash screen and let it download/fetch everything it needs.
  • The Standard download should be sufficient rather than the Full download
• Once LLSIF starts up, go to Members > Member List, and slowly scroll through the list
• Now go to the Support tag and do the same
• Now go to the Waiting Room and do the same
  • I'm not actually sure if these parts are required, but I did them just in case
• Now go back to the home screen, click Presents, and select the Members tab
• Start scrolling down the presents list, letting the next few presents load each time you reach the bottom
  • Continue until you can't scroll the list any more
• Once you've done this, on the window where you're running tshark hit Ctrl-C to stop the packet capture
  • The jsonfiles directory in there should now have a whole bunch of JSON files captured, in which your entire LLSIF history is buried
  • (It should also have a bunch of binary files, but these are ciphered by Klab and most likely not usable)

Notes

The JSON files contain a lot of guff, so to find relevant stuff I used a few commands to filter out unnecessary files.

cd jsonfiles

# Lists the JSON files in creation time order
ls -lU *json | less

# There are a whole bunch of JSON files that only have request URLs for static assets. This command should filter those ones out
ls -U *json |xargs -I{} grep -L "{\"response_data\":{\"url_list\":" {} |less