1. Prepared by Emre Aydemir & Arif Çanakoglu CMPE 473 Project
The eMule Project
Prepared by
Emre Aydemir & Arif Çanakoglu
CMPE 473 Project

2. Outline Introduction Protocol TCP Protocol UDP Protocol
Client – Server Communication
Client – Client Communication
UDP Protocol
This is the outline of our presentation

3. Introduction P2P file sharing application Client Side Server Side
Extended from eDonkey protocol
Based on both TCP and UDP
Client Side
Open source
Server Side
Introduction:
Emule is p2p file sharing application. Emule is
Emule has server client architechture and cl-cl arch

4. eMule Network Diagram Picture from www.emule-project.com
--You can see this in this diagram
This is emule client(show center) these are servers and these are other clients.
This connects to one of the server directly with tcp. And other server via UDP.
And clients can connect with using udp and tcp with other clients we will talk about this later.
Picture from

5. Protocol TCP Communication UDP Communication Client – Server
Client - Client
UDP Communication
There are twotypes of protocol one of them is tcp other is udp
UDP is optional and both is used in client and server connections

6. Client – Server Protocol
Login Process
Connection startup
File Search
Callback Mechanism
Firstly ı want to talk about

7. Login Process
LowID
HighID

8. Connection startup Client sends shared file list Server provides
Server status
List of servers
Source lists

9. File Search
Search for a file
Get list of sources

10. Callback Mechanism
Access from highId client to lowId client

11. Client – Client Protocol
Handshaking
File requests
Upload Queue Operations
Data Transfer

12. Handshaking
Initial message for connection
Symmetric

13. File Requests Checks whether source supplies the file
Gets available list of sources

14. Upload Queue Operations
Upload Request
Start Transfer
Enter upload queue
Reaching Top of Upload Queue
Request part
Cancel Transfer

15. Data Transfer
Transfer of file parts
eMule supports compression

16. Client Server UDP Communication
UDP is used for :
Server status checks
Enhanced file search
Enhanced file-source searches
Optional

17. Client-Client UDP Communication
Used in checking position in source queue

18. Application Queue Management Credit System Download part ordering
Corrupted download recovery

19. Thank you...