ping_flash2 ?

[denysvitali]

Hi everyone,
today I received randomly this "error":

ping_flash2 [ '239 152 50 42 152 117 81 73 241 95 119 216 147 166 61 169 64 196 18 135' ]
Error: TODO: implement!
    at Spotify._onmessagecommand (/media/denys/Homes/denys/node_modules/spotify-web/lib/spotify.js:443:11)

Did someone already got this error?

-- UPDATE --
Some logs infos:

{"message":["ping_flash2","77 156 127 5 171 248 223 205 104 212 164 78 203 10 176 127 173 251 240 140"]}

{"id":5,"name":"sp/pong_flash2","args":["228 190 100 128 11 108 110 143 61 10"]}

{"message":["ping_flash2","75 206 105 130 19 165 181 131 194 222 48 164 99 212 170 209 65 120 114 35"]}
{"id":5,"name":"sp/pong_flash2","args":["75 82 98 7 159 62 51 12 115 212"]}

[adammw]

Hmm, seems to be calling the Flash player interface, and then sending back the result of some operation that's been compiled into Flash from C++. Stubbing it out by just sending back args of "undefined 0" (or not sending anything back and ignoring it) seems to work for now, but to fix this properly (and for good), we would need an actionscript vm and interface to actually run the Flash code.

[denysvitali]

If you change the client version to the new one ( client version: 0.6.23.149, deployed at 2014-02-06 09:54 UTC ) it won't permit to "ignore it"...

[endoplasmic]

Around line 442 in the spotify.js file you can just use this:

} else if ('ping_flash2' == command) {
    //who knows what this is for...

[adammw]

Looking into if we can get Shumway to load the player.swf file into javascript and call functions, that would be EPIC if we could get that to happen, however I am slightly skeptical on Alchemy support in shumway at the moment, it's likely going to be a lot of effort.

[TooTallNate]

Looking into if we can get Shumway to load the player.swf file into javascript and call functions

I had the same initial thought. Didn't get much further than looking at the Shumway homepage. I'm not sure how node-compatible Shumway is, since I believe it's designed for the web browser. A compatibility shim may be required.

[adammw]

Spent today the last 3 hours looking into it, there's no good news here. :(

[TooTallNate]

@adammw Where did you get hung up on exactly? I've been looking into it as well but am caught up on what the newGlobal() function is here.

[adammw]

The ping_pong function in the player.swf file is alchemy compiled (ie a C++ function compiled into actionscript byte code ). Chatting on IRC, shumway isn't likely to have much support for that because of its design, and I wasn't able to get it to load in the shumway inspector either.

[denysvitali]

By player.swf

private function doWork(s:string):string{ return (ping_pong(s)); }

op_si32(__GLOBAL__I__Z9ping_pongv, (_local173 + 0)); //Alchemy

op_si32(__GLOBAL__D__Z9ping_pongv, (_local2 + 0)); //Alchemy

I couldn't understand those lines (except for the "do_work" function) because I'm not so good with ActionScript programming and I think that this is actually compiled. Maybe a flash geek could help us?

(I decompiled the swf with showmycode.com)

[TooTallNate]

Maybe it's time we start reverse engineerring this bad boy: https://github.com/adobe-flash/crossbridge

[denysvitali]

Is there anyone who has experience in reverse engineering of Shockwave Flash?

[adammw]

😄 think I cracked it...

[mauimauer]

Awesome. What did they hide inside there this time?