First in world self-made client to Skype Network based on reversing original Skype 5.5 client.
For now, only receiving and sending messages are supported.
As for now it compiles with Visual Studio (can't confirm if still working after changes done by me. You probably can get working copy from original repository) and MinGW (this one doesn't work for sure) on Windows
Due to disagreements with @skypeopensource after which I was banned by him, his (in my opinion) poor infrastructure decisions and rejection of this project, it is now independent fork (i.e. no PRs to main repo). Yet all the credit for the reverse engeneering goes to @skypeopensource
- Make a project compile on Linux
- mainly to rewrite
winsock.h-specific code
- mainly to rewrite
- Make project work on MinGw and gcc on Linux
- rewrite inline assembly code in plain C
- Make code 64-bit compatible
- Rewrite reverse engineered code to human-readable one
- Create simple usable API
- Create CLI client
- Create cross-platform GUI client (Qt)
- Add tests
- Add documentation
This is very ambitious plan and would require many hours of pretty big team to finish. I'm not hoping to do that alone since I don't have enough time and experience for that and pretty sceptical about whether that will be ever done at all. I only listed things that I believe should be done to make this project useful to others. As for now I'm focusing on a first goal, but welcome any contribution from anyone, both for anything listed above or not. Feel free to contact me in any way you find convenient.
LGPL 3.0
Program tested, protocol still working OK.
But due to heavy testing during news headlines, function Skypename to IP fail because of static ip.
Need change it and recompile as mention before.
Program tested, protocol still working OK.
But due heavy testing during news headlines, function Skypename to IP fail because of static ip used.
To workaround this problem, uncomment new ip address (the "good one") in this code:
// main
ip=strdup("157.55.235.147");
port=40030;
// good one
//ip=strdup("65.55.223.14");
//port=40016;
And recompile it.
You can also use this project to do it on linux. And use result strings as vcard to Vcard area in program GUI (but do fail resolv at first, its need to get public ip). I just tested it, it work good.
Program still working OK.
Some additional info on usage:
If you got this error on black console:
UIC_CRC = 5E8EBAE5
pkt block crc32=00009C54
relay_connect_mode = 1
LOCAL_SESSION_ID_RELAY = 0x00002619
total=0x00004C32
last2b=0x0000D066
encode len: 0x0000044A
And this error in "Debug Data" area:
Message send failed. Ret code:-1
Screenshot:
Then try to remove a_cred.txt file, close program and run again. Its some bug with bugged credentials. Which happens from time to time.
The README should clearly state:
- whether or not this client is a complete re-implementation
- whether or not it includes disassembled code from the other Skype clients
- whether or not it is a clean-room reverse-engineered code, like Wine/ReactOS
- why the specified license is valid and legal to use for the project
- what are the legal complications, if any, to developing the project and to using it personally or commercially
whether or not this client is a complete re-implementation
Yes. It's a complete re-implementation of proprietary Skype Network protocol.
whether or not it includes disassembled code from the other Skype clients
Well, maybe a little :) unpack-4142.c and pack-4142.c are HexRays decompiled code and should be rewritten but I don't have time for this now.
Additionally, check this comment by @marcan
whether or not it is a clean-room reverse-engineered code, like Wine/ReactOS
No. Not clean room, not Chinese wall.
why the specified license is valid and legal to use for the project
It's my own code, I write it, I am the author of most code and I hold all copyright rights.
Well, except some login pieces (skyauth3/skype_login.c) which are copyrighted by Sean O'Neil from VEST Corporation in 2009 and RC4 reversing and implementation (skype_rc4.c/skype_rc4.h) also by Sean O'Neil.
what are the legal complications, if any, to developing the project and to using it personally or commercially
- The
pack-4142.c/unpack41-42.cmentioned above. - Also, it contains MIRACL for RSA and big numbers multiply arithmetics.
MIRACL Cryptographic SDK: Multiprecision Integer and Rational Arithmetic Cryptographic Library is a C software library that is widely regarded by developers as the gold standard open source SDK for elliptic curve cryptography (ECC). http://miracl.com https://github.com/miracl/MIRACL
- goodrecvrelay -- recv msg running flow
- goodsendrelay -- send msg sequences flow
- skyauth -- login process code
- skycontact -- contact list load from the event-server
- skyrelay -- some buggy version for "skype version check" its like send/recv msg but with handshake init packets only.
- skysearch -- resolver for skypename to get parent-node of the user and his IPs.
- sqldbread -- SQLite stuff for chat history and local_header_id and remote_header_id of message.