Question about SOCKS4

[I_Smell_Tuna]

If the third and fourth bytes are supposed to be for the destination port how do you split up the port number between those two bytes?

[shout]

Very carefully with alot of practice.

You need to convert the value to a byte array, then stick it in.

Converting it depends on your langauge.

[I_Smell_Tuna]

Visual Basic

[tA-Kane]

A method that a lot of beginning Visual Basic users use is to convert the port (an integer) to a hexadecimal value using the Hex() function, then use Val() for each byte (meaning twice), using a different part of the result from Hex().

Code Select Expand

Dim Result As String // the result goes into here, to be written to the network stream
Dim HexStr As String // temporary buffer for hexadecimal string
Dim Port As Integer // the port you want to write to the network stream

Port = 6112
HexStr = Right("000" & Hex(Port), 4)
Result = Val("&h" & Left(HexStr, 2)) & Val("&h" & Right(HexStr, 2))

Note that this does not consider endianness, which may be incorrect for most Visual Basic implementations trying to make use of the SOCKS protocol.

[NetNX]

endianness? explain...

[tA-Kane]

0x0001 is 1 on one platform, whereas it's 65536 on another platform.

[Kp]

No, it isn't.   65536 = 2**16 = 0x10000.  You forgot a zero.

[tA-Kane]

Oh well, I was slightly distracted when I posted that. Here's the corrected statement:

0x0001 is 1 on one platform, whereas it's 256 on another platform.