===== CS3103 programming assignment 1 submission =====
Name: Liu Jialong
Matric #: U0909122
GROUP #: 25
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A brief explanation
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client and fileserver both have active-open and passive-listen actions.
The server starts with 2 listening ports, one for commands/results, one exclusively for file transfers.
The client starts with listening on 1 port (for file transfer) and actively connecting to server's port for commands/results. It then dynamically creates threads and sockets to pull files when a "get" command is entered.
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Comments to grader
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I have chosen to implement the following (hopefully correctly) to get bonus points:
a) Client can handle multiple simultaneous downloads of different files.
Implementation:
I start a thread for each download, therefore command entering will not be blocked. (client.c:159)
b) Clients connect directly to other clients to download the shared
files. The clients is listening for connections on a port.
This port number, however, is not transmitted to the server. It
is a shared knowledge in constants.h. I know it is not perfect
to do so, but I didnt have enough left... :( :p
When a client wants to download a file located at another client,
it obtains the IP address and port number of the client from the
server.
Implementation:
Each client listens on a well-known high port for file requests. (client.c:121,183)