Oke well that's a little bit more but still very little information:P
but i'll answer your questions They might be a bit inaccurate cause I use C++ so i'll keep it globally which is used for a lot languages.
1. How can I read packets?
- There are 3 ways which I think about right now.
1. Inject into the client and extract the packets (Like edxSilkroadLoader) the result
is very nice cause you get the packets already parsed but it's the most difficult
way to parse packets.
2. Create a proxy(Search on wikipedia). it just connects to the official server and
waits for an client to connect and you can dump the packets.
3. Read them from your network adapter with something like winpcap.
The easiest is the 2nd way.
The most safest way is the 3rd way (2 is also 100% unless they can detect a proxy usage)
The best/easiest in a way to use/read the packets is the first one. cause the packets are already parsed so the heavy work is already done however it is injected into the client which can be insecure but drew is a great programmer so I guess it's pretty safe:) i've never been banned with that loader.
well your 2nd question "What is packet parsing"
EdxSilkroadLoader already has an build in packet parser which parses the packets for you but you want to know what parsing is so I'll explain it.
Lets say you got this packet:
Code:
10 00 01 20 00 00 0D 00 47 61 74 65 77 61 79 53
65 72 76 65 72 00
This is how you an sniffed packet looks like.
In silkroad the packet header is 6 bytes and the first 2 bytes is the size the 2nd two bytes is the opcode and the 2 bytes which ar left are the security bytes( Read drew bentons article about the security)
so in this case "10 00" is the size which is 16 if i'm correct.
the next two byts are "01 20" which you read as 2001 which is the opcode and the following two security bytes are 2 zeros well what we just did is parsing the packets just breaking it in pieces.
Here is an little example of how this looks like in EdxSilkroadLoader
Code:
Size = 16 opcode = 2001
0D 00
47 61 74 65 77 61 79 53 65 72 76 65 72 GatewayServer.
00
This isn't exactly the output of edxSilkroadLoader cause it typed this by myself but this is kinda how it looks like.
your 3rd question how to inject an packet
well to inject an packet you need some kind of proxy which is the easiest way and just send an packet to the server that's all
your 4th question "how to build a packet"
well building an packet can be done at differnt ways
for my own project i create an byte array which is my buffer and I move a pointer in that array to insert values. this is the C++ way but you could also create a structure with some members and set those and just send the structure.
your 5th question is like "what an opcode is used for in sro?" at least i guess
opcode stands for OPeration CODE so with this code (which you also see above) you can see what kind of packet it is. Like a moving packet which is 7021 from the client to the server or a chat packet which is something else.
your 6th question the differense between ascii and binairy
well just look at wikipedia for the best answer. ascii is just the standard character scheme but you also have unicode which are just the characters but unicode also has chinese and arabian chars in it. (silkroad uses both)
and binary are just a bunch of 0's en 1's which is something different. just look at wikipedia.
and i don't get your last question