Packet Enquiry

[Josh]

How are you supposed to make a packet? What Format?

[KiLO]

If you take a look at some of the open source programs, you can find examples of use. Yeah, sure the info isn't given right to you, but who said coding was painless?

Also, if you checkout the Internet Achive you can see a brief documentation on KM's old MCS site.

http://web.archive.org/web/20041027202709/www.mxtools.net/?section=techie&page=cht

Thank God for the Internet Archive  :roll:

[KM]

a packet would refer to a UDP packet, or perhaps the raw TCP packets, if you mean sending messages through the TCP stream, that's not packets

but it just uses the raw data, 2 bytes for a type, 2 bytes for a length, and then the body of the message - the exact formats for the messages are on that page, but you already know that, you did take it and put it on your website...

[Josh]

well like? what would the join packet be. You make it real hard for the people that want to learn.

[KM]

...you should know, it is in your website

[Josh]

yea but people with no brain can not understand it

[Sharky]

How are you supposed to make a packet? What Format?

[Type - 2 Bytes] [Length of data - 2 Bytes] [Data - Any Size]

The Join Request Type Would Be: 0x0064

[0x0064][Len - 2 Bytes][RoomName - NULL Terminated][Connection - 2 bytes][Primary IP - 4 Bytes][Primary Port - 2 Bytes][Files - 4 Bytes][UserName - NULL Terminated]

Now, lets go over how to create a join packet.

C Code:

Code: [Select]

// Vars
char RoomName[256] = {0x00};
char UserName[64] = {0x00};
WORD wLine = 0;
WORD wPrimeUDPPort = 0;
DWORD dwFiles = 0;
DWORD dwPrimeIP = 0;
char buffer[MAX_BUFFER_SIZE] = {0x00};

sprintf(RoomName,"YourRoom_0100007f0003");
sprintf(UserName,"YourUserName000_00000");
//skip the first four bytes, for now.
WORD Len = 4;
//copy our room name to our packet
lstrcpy(buffer+Len,RoomName);
// our length is then increased,
// we then add the length of our ROom Name
// to our total length variable (Len)
// Since the end of the string has no value (NULL)
// we can just skip it by adding 1 to the total length
Len+=strlen(RoomName)+1;
//Now we copy our linetype
memcpy(buffer+Len, &wLine, 2);
// since the linetype is only 2 bytes
// we add 2 to our total length
Len+=2;
// we then copy our Prime IP
memcpy(buffer+Len, &dwPrimeIP, 4);
// since the prime ip is 4 bytes
// we add 4 to our total length
Len+=4;
// Now we copy our Prime UDP Port
memcpy(buffer+Len, &wPrimeUDPPort, 2);
// 2 bytes, we add 2
Len+=2;
// Add our file count
memcpy(buffer+Len, &dwFiles, 4);
// 4 bytes, we add 4
Len+=4;
// add our user name
lstrcpy(buffer+Len, UserName);
// add the length of our username to the total length var (Len)
// Null terminated, we just add 1, since end of string contains null chars
Len+=strlen(UserName)+1;
// we add our type at the beginning
*(WORD*)buffer = 0x0064;
// we add our packet length
*(WORD*)buffer+2 = Len-4;
// we subtract 4, the type and lenght are each 2 bytes, which makes 4, we don't
// add the length of our type and length.

// Encrypt

YourdwUPKey = EncryptMXTCP((BYTE*)buffer, Len, YourdwUPKey);

// this should help, it doesn't explain everything, but it answers your question
// on how to write a join packet. Please excuse any syntax errors in my code, it was
// written in notepad. LOL


[Josh]

Would of been useful about a year ago. I dont program for winmx anymore.