Packet analysis

[DeliKymkm]

Hi everyone, im trying to build some kinda bot.

Client: 07-00-74-70 -6B-5D- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -7E-56- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -43-6C- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -27-48- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -DF-24- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -8C-AC- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -EF-ED- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -88-90- 01-04-0C-4D-00-00-00
Client: 07-00-74-70 -13-77- 01-04-0C-4D-00-00-00

So these are the byte arrays going to server from client when i use buff skill. But what are the seprated columns ? Can some explain it ? Sorry for bad English.

[homelesshobo]

[DeliKymkm]

Originally Posted by homelesshobo

I dont get it

[homelesshobo]

My edit was a bit late there:

 General packet structure

Taken from :

// This is the generic packet structure
struct tPacket
{
	// Size of this packet
	WORD size;
	// Opcode of this packet
	WORD opcode;
	// Security count byte (0 from server to client packets)
	BYTE securityCount;
	// Security crc byte (0 from server to client packets)
	BYTE securityCRC;
	// Pointer to the remaining data and other packets
	BYTE dataPointer[8186];
};

Size – 2 bytes. The size of the data payload of the packet. Once again, this does not include the 6 bytes for the header.
Opcode – 2 bytes. The opcode for the packet.
SecurityCount – 1 byte. 0 if the packet is being sent from the server. This is only set for client to server packets.
SecurityCRC – 1 byte. 0 if the packet is being sent from the server. This is only set for client to server packets.
DataPointer – 0 or more bytes. This is the remaining data of the packet or possible more packets. I list it as being a max of 8186 bytes since that is the physical limit for the data being received along with the packet header, a total of 8192 bytes in a call to recv().

 0x7074 packet structure

// Cast anti devil bow
[C -> S][7074]
01                                                action phase flag // 1 = start 2 = cancel/complete
04                                                type // 1 = autoattack 4= use skill
47 00 00 00                                       skillRefID
01                                                targetted ?
F3 17 A5 01                                       uniqueID // targetID

//[S -> C][B074]
01                                                confirmation flag
01                                                secondary cast when in range ?

// Start autoattack
[C -> S][7074]
01                                                action phase flag // 1 = start 2 = cancel/complete
01                                                type // 1 = autoattack 4= use skill
01                                                targetted flag?
F3 17 A5 01                                       uniqueID // targetID

[S -> C][B074]
01                                                confirmation flag
01                                                secondary cast when in range ?

By example of your first packet, you would end up with:

Client: 07-00-74-70 -6B-5D- 01-04-0C-4D-00-00-00

07-00		size  // 7 bytes
74-70		opcode // 0x7074
6B		security count //107
5D		data pointer

// 0x7074 starts here
01		success ?
04		type // 4 = use skill
0C-4D-00-00	skillRefID // 19724 GSKILL_EU_WIZARD_EARTHA_AREA
00		target ?

[DeliKymkm]

Originally Posted by homelesshobo

My edit was a bit late there:

 General packet structure

Taken from :

// This is the generic packet structure
struct tPacket
{
	// Size of this packet
	WORD size;
	// Opcode of this packet
	WORD opcode;
	// Security count byte (0 from server to client packets)
	BYTE securityCount;
	// Security crc byte (0 from server to client packets)
	BYTE securityCRC;
	// Pointer to the remaining data and other packets
	BYTE dataPointer[8186];
};

 0x7074 packet structure

// Cast anti devil bow
[C -> S][7074]
01                                                action phase flag // 1 = start 2 = cancel/complete
04                                                type // 1 = autoattack 4= use skill
47 00 00 00                                       skillRefID
01                                                targetted ?
F3 17 A5 01                                       uniqueID // targetID

//[S -> C][B074]
01                                                confirmation flag
01                                                secondary cast when in range ?

// Start autoattack
[C -> S][7074]
01                                                action phase flag // 1 = start 2 = cancel/complete
01                                                type // 1 = autoattack 4= use skill
01                                                targetted flag?
F3 17 A5 01                                       uniqueID // targetID

[S -> C][B074]
01                                                confirmation flag
01                                                secondary cast when in range ?

By example of your first packet, you would end up with:

Client: 07-00-74-70 -6B-5D- 01-04-0C-4D-00-00-00

07-00		size  // 7 bytes
74-70		opcode // 0x7074
6B		security count //107
5D		data pointer

// 0x7074 starts here
01		success ?
04		type // 4 = use skill
0C-4D-00-00	skillRefID // 19724 GSKILL_EU_WIZARD_EARTHA_AREA
00		target ?

Whoa.. Thanks man