Network protocol (Worms Armageddon)
From Worms Knowledge Base
Contents
General
- Sizes and offsets are in bytes
- All offsets are from the start of the packet's data
- Word size = 2 bytes
- DWord size = 4 bytes
- Everything is LSB on the wire (Little Endian)
Message header
| Offset | Size | Value |
|---|---|---|
| 00 | Byte | 1 for frontend messages, 2 for ingame (compression ?) |
| 01 | Byte | (??) may be ignored |
| 02 | Word | Message size (max is 0x1414, if larger, the header(s) is(are) sent again) |
| 04 | Word | Command |
Length: 6
Packet Commands List
| Hex | Dec | Description |
|---|---|---|
| 0x00 | 00 | #Chat Message |
| 0x01 | 01 | ??????? |
| 0x02 | 02 | ??????? |
| 0x03 | 03 | ??????? |
| 0x04 | 04 | Login from client (completeme) |
| 0x05 | 05 | Another login from client (completeme) |
| 0x06 | 06 | Client sends password (completeme) |
| 0x07 | 07 | Password Required (no data) |
| 0x08 | 08 | Sucessfully joined (or password ok) need to figure out what the data means (version of the host ??) |
| 0x09 | 09 | Wrong password (no data) |
| 0x0A | 10 | Error joining (nickname already used, or missing, or flag missing/incorrect) < need to figure out exact symptoms |
| 0x0B | 11 | #Player list |
| 0x0C | 12 | #Team list |
| 0x0D | 13 | #Custom Scheme data |
| 0x0E | 14 | Player joined (sent to already connected players) |
| 0x0F | 15 | #Ready signal |
| 0x10 | 16 | #Remove Team |
| 0x11 | 17 | #Changing Scheme data Round Time |
| 0x12 | 18 | #Changing Scheme data Turn Time |
| 0x13 | 19 | #Changing Scheme data Victories needed |
| 0x14 | 20 | #Changing Scheme data Worm Selection |
| 0x15 | 21 | #Changing Scheme data Worms HP |
| 0x16 | 22 | #Change Team - team color |
| 0x17 | 23 | #Change Team - team handicap |
| 0x18 | 24 | #Change Team - number of worms |
| 0x19 | 25 | Player left the game (sent to connected players) |
| 0x1A | 26 | #Add Team |
| 0x1B | 27 | You have been Kicked (no data) |
| 0x1C | 28 | #Starting Game |
| 0x1D | 29 | #Changing Scheme data Worm Placment |
| 0x1E | 30 | ????????? |
| 0x1F | 31 | #Default Scheme data |
| 0x20 | 32 | Default Maps (like ArtClass) just a String with the map name, 40 bytes long |
| 0x22 | 34 | This packet is sent from server when version = 0, very weird. |
| 0x23 | 35 | The client sends this after the 0x22 , can't get it to work. |
| 0x27 | 39 | Gameid incorrect (or no more place ?) |
| 0x2B | 43 | #Map |
Chat Message
| Command: | 0x0000 |
|---|---|
| Direction: | Both |
| Size: | Variable |
Just a String, 00 Terminated.
Type:FromNick:ToNick:Text
Differents Types
Normal Message : GLB
Private Message : PRV
System Message : SYS
Notes :
- ToNick is often set to "ALL" to be sent to everyone (doesn't work for whispers)
- When X types /me Text, it sends this : SYS:X:ALL:X Text
- For systems messages, FromNick can be null, since it's not shown
Join
Joining consists of several steps:
Step 1
| Command: | 0x0004 |
|---|---|
| Direction: | From client |
| Size: | 128 |
- Nick at 06, null terminated, ends (last place the null could be) at 22.
- Gameid (ascii) at 23, null string for IP games.
- Version at 64, composed of 30 24 F4 (hex)
NB : these 3 parameters are sufficient to enter a game. Everything else can be 0 and it's ok. Figure out what follows.
Step 2
| Command: | 0x0008 |
|---|---|
| Direction: | To client |
| Size: | 6 |
Acknowledgement. Empty message. Figure out error messages. (different commands?)
Step 3
| Command: | 0x0005 |
|---|---|
| Direction: | From client |
| Size: | 114 |
- Nick at 06, null terminated.
- Flag (+1) at 72 (if 13 is France, then to put French flag, you have to put 13+1 = 0x0E)
Figure out what follows.
Step 4
Server sends:
- Player list, see below.
- Team list (when not empty), see below.
- Map data, see below. (Map is not sent when we rejoin?)
- A message with command 0x001f? What is it?
Figure out how the scheme is sent here when it's not the default Intermediate
Player list
| Command: | 0x000b |
|---|---|
| Direction: | To client |
| Size: | 1176 |
This looks like it's sending a raw array of player structures. Each player structure is 120 bytes in size.
Names are limited to 17 characters, and are padded with 0 bytes. (If a name is exactly 17 characters, there will NOT be a null-terminator) Figure out what the rest is.
Considering there can be 7 players, the total length should be 840 bytes. Array starts at 06.
Depending, that leaves 330, 328 or 324 trailing bytes. Figure out what follows (or what is before the array).
The structure for each player is: char name[17]; uint8_t unknown[17]; uint8_t unknown[14]; uint8_t unknown[60]; int16_t prev; // index of previous player struct? first player it's set to -1 uint16_t unknown; uint8_t country; uint8_t unknown[7];
Team list
| Command: | 0x000c |
|---|---|
| Direction: | To client |
| Size: | ?? |
TODO
Custom Scheme data
| Command: | 0x000d (13dec) |
|---|---|
| Direction: | To client |
| Size: | 308 |
| Offset | Size | Value |
|---|---|---|
| 00 | Word | (??) |
| 02 | DWord | An identifier for the scheme. (-1 for custom, scheme, 1-13 for default (edited) scheme) |
| 06 | 292 bytes | Scheme file withouth "SCHM" header |
| 298 | DWORD | (?) |
Default Scheme data
| Command: | 0x001f (31dec) |
|---|---|
| Direction: | To client |
| Size: | 12 |
| Offset | Size | Value |
|---|---|---|
| 00 | Word | (??) |
| 02 | DWord | An identifier for the scheme. |
| Identifier | Scheme |
|---|---|
| 1 | Beginner |
| 2 | Intermediate |
| 3 | Pro |
| 6 | Artillery |
| 7 | Classic |
| 8 | Armageddon |
| 9 | The Darkside |
| 11 | Retro |
| 13 | Strategic |
| 14 | Sudden Sinking |
| 15 | Tournament |
| 16 | Blast Zone |
| 17 | The Full Wormage |
If you put 0 as Scheme Identifier, it will crash the game. Any other number that doesn't appear in the list will put Intermediate.
Changing Scheme data
| Command: | Depends |
|---|---|
| Direction: | To client |
| Size: | 12 |
| Offset | Size | Value |
|---|---|---|
| 00 | Word | Always 0x3E (62dec) ? |
| 02 | DWord | Value |
| Command | Description |
|---|---|
| 0x11 (17dec) | Round Time (Positive = Minutes, Negative = Seconds) |
| 0x12 (18dec) | Turn Time (FFFFFFFF = Infinite) |
| 0x13 (19dec) | Victories needed |
| 0x14 (20dec) | Worm Selection (0 = Disabled ; 1 = Enabled) |
| 0x15 (21dec) | Worms HP |
| 0x1D (29dec) | Worm Placment (0 = Disabled ; 1 = Enabled) |
Ready signal
| Command: | 0x000f |
|---|---|
| Direction: | Both ways |
| Size: | 16 |
| Offset | Size | Value |
|---|---|---|
| 08 | DWord | on/off |
| 0B | DWord | Player number |
Starting Game
| Command: | 0x001c |
|---|---|
| Direction: | To client |
| Size: | 20 |
| Offset | Size | Value |
|---|---|---|
| 06 | Word | I guess this is only not important junk and can be anything (need verification) |
| 08 | DWord | HKEY_CURRENT_USER\Software\Team17SoftwareLTD\WormsArmageddon\Data\LogicSeed |
| 0C | DWord | "GSAW" (this is hardcoded, but i think it can be anything, not important) |
| 10 | DWord | Version of the Game (4C for the normal 3.6.28.0) |
Map
| Command: | 0x002b |
|---|---|
| Direction: | To client |
| Size: | 64 |
| Offset | Size | Value |
|---|---|---|
| 06 | Byte | (??) |
| 07 | Byte | Always 01 ? |
| 08 | DWord | File Lenght |
| 0C | DWord | Data Offset |
| 10 | DWord | Data Lenght |
| 14 | Data Lenght | Data |
Note : A DWord is put at the beginning of the File to tell what type of Map is sent.
1 = .BIT Monochrome map (.bit, .lev)
2 = .LEV Monochrome map (.bit, .lev)
3 = .PNG Colour map
Exemple of a multi-packeted BIT-file (135434(0x34DE)bytes file):
<01 48 1414 2B00> <A2 01 [E2 34 00 00] [00 00 00 00] [00 14 00 00]> [ 01 00 00 00 { .BIT file DATA } ]
<01 48 1414 2B00> <A2 01 [E2 34 00 00] [00 14 00 00] [00 14 00 00]> [ { .BIT file DATA } ]
<01 9C F60C 2B00> <A5 01 [E2 34 00 00] [00 28 00 00] [E2 0C 00 00]> [ { .BIT file DATA } ]
