PreferencesKad.dat file
From AMule Project FAQ
Contents
File
Name: preferencesKad.dat
Location: ~/.aMule/
Description
This file stores the IP and Kademlia ClientID.
Format
The file format is as follows:
- IP: Stores the [client]]'s IP (4 bytes, LSB first)
- Deprecated field: This field is no more used, so it's filled with 0s (2 bytes)
- ClientID: The client's ClientID (16 bytes)
- End of tags signal: Old eMule clients expected more info to be read on this file. To remain compatible with those clients, this field is set to 0 (1 byte)
Reading and writing the ClientID is somewhat tricky. It is stored as four 32bit little-endian integers, which themselves represent the 128bit value in big-endian order. See the example below.
Example
The following is a hex dump of an hypothetic preferencesKad.dat file:
01 40 52 5B 00 00 B4 F1 52 14 18 17 9A 80 44 57 29 8A B9 3A 2B 6F 00
In the above example, the following data can be seen:
- IP: 91.82.64.1 (In hex: 0x5B524001)
- Deprecated field: 0 (In hex: 0x0000)
- ClientID: 1452F1B4809A17188A2957446F2B3AB9
- End of tags signal: 0 (In hex: 0x00)
Extra
aMule ignores the End of tags signal when reading this file, so it is optional to use it. Anyway, aMule does write it to keep compatibility with old eMule clients.
