Packets/Login/Vanilla

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Vanilla (1.1.2.4125)

It's worth noting that, for this build, the client automatically disconnect after a successful login challenge and proof exchange and sends a reconnect packet right away instead of asking for the realm list.

Some enums first:

Opcodes
Name Value
LOGIN_CHALL 0x00
LOGIN_PROOF 0x01
RECON_CHALL 0x02
RECON_PROOF 0x03
REALMLIST 0x10
XFER_INITIATE 0x30
XFER_DATA 0x31
Error codes
Name Value
LOGIN_OK 0x00
LOGIN_FAILED 0x01
LOGIN_FAILED2 0x02
LOGIN_BANNED 0x03
LOGIN_UNKNOWN_ACCOUNT 0x04
LOGIN_UNKNOWN_ACCOUNT3 0x05
LOGIN_ALREADYONLINE 0x06
LOGIN_NOTIME 0x07
LOGIN_DBBUSY 0x08
LOGIN_BADVERSION 0x09
LOGIN_DOWNLOAD_FILE 0x0A
LOGIN_FAILED3 0x0B
LOGIN_SUSPENDED 0x0C
LOGIN_FAILED4 0x0D
LOGIN_CONNECTED 0x0E
LOGIN_PARENTALCONTROL 0x0F
LOGIN_LOCKED_ENFORCED 0x10

Challenge packets:

AuthLogonChallenge_Client
Offset Type Name Description
0x0 uint8 command 0x0
0x1 uint8 error
0x2 uint16 size length of package minus 4
0x4 char[4] gamename 'WoW'
0x8 uint8[3] version 0x01 0x01 0x02
0xB uint16 build 4125, aka Revision
0xD char[4] platform eg 'x86'
0x11 char[4] os eg 'Win'
0x15 char[4] country eg 'enUS'
0x19 uint32 worldregion_bias offset in minutes from UTC time ,
eg. 180 means 180 minutes
0x1D uint32 ip client_ip
0x21 uint8 account_name_len
0x22 char[account_name_len] account_name
AuthLogonChallenge_Server
Offset Type Name Description
0x1 uint8 command 0x0
0x2 uint8 unk
0x3 uint8 err
0x4 char[32] B SRP public server ephemeral
0x24 uint8 g_len SRP generator length
0x25 uint8 g SRP generator
0x26 uint8 n_len SRP modulus length
0x27 char[32] n SRP modulus
0x47 char[32] srp_salt SRP user's salt
0x47 char[16] crc_salt A salt to be used in AuthLogonProof_Client.crc_hash

Proof packets:

AuthLogonProof_Client
Offset Type Name Description
0x0 uint8 command 0x1
0x1 uint8[32] a
0x21 uint8[20] m1
0x35 uint8[20] crc_hash
0x49 uint8 num_keys
AuthLogonProof_Server
Offset Type Name Description
0x0 uint8 command 0x1
0x1 uint8 error
0x2 uint8[20] m2
0x16 uint32 unk

Reconnection challenge packets:

AuthReconnectionChallenge_Client has the same structure as AuthLogonChallenge_Client, except that the command is 0x2.

AuthReconnectionChallenge_Server
Offset Type Name Description
0x0 uint8 command 0x2
0x1 uint8 error
0x2 char[16] challenge_data random data, used as a challenge
0x12 uint64 unk1
0x1A uint64 unk2

Reconnection proof packets:

AuthReconnectionProof_Client
Offset Type Name Description
0x0 uint8 command 0x3
0x1 char[16] proof_data
0x11 char[20] client_proof
0x25 char[20] unk_hash
0x39 uint8 unk

To check if the client proof is correct, the server must calculate SHA1(account_name | proof_data | challenge_data | session_key) and compare it to client_proof.

AuthReconnectionProof_Server
Offset Type Name Description
0x0 uint8 command 0x3
0x1 uint8 error

Realm list packets:

RealmList_Client
Offset Type Name Description
0x0 uint8 cmd REALMLIST
0x1 uint32 unknown null

The server answers with a packet composed of a RealmHeader_Server, as many RealmInfo_Server as specified and a RealmFooter_Server.

RealmHeader_Server
Offset Type Name Description
0x0 uint8 cmd REALMLIST
0x1 uint16 size size of the rest of packet, without these 3 first bytes
0x3 uint32 unknown null
0x7 uint8 num_realms Number of RealmInfo_Server

The size value can be computed with the part of the header taken into account plus the footer (5+2 bytes) and the size of every RealmInfo_Server which is variable.

RealmInfo_Server
Offset Type Name Description
0x0 uint32 type realm type? 0 is normal, 1 is PVP
0x4 uint8 flags see below
0x5 char[] name Zero terminated string; name of the Realm
char[] addr_port Zero terminated string; address of the Realm ("ip:port")
float population Population value. 0 is low, 1 is medium, 2 is high.
uint8 num_chars The number of chars you have on that server
uint8 time_zone really?
uint8 unknown
Flags     Meaning
0x01     Color the realm name in red (can't create char?)
0x02     Realm is offline
RealmFooter_Server
Offset Type Name Description
0x0 uint16 unk

Vanilla (1.12.1.5875)

Proof packets changed during Vanilla:

AuthLogonProof_Client
Offset Type Name Description
0x0 uint8 command 0x1
0x1 uint8[32] a
0x21 uint8[20] m1
0x35 uint8[20] crc_hash
0x49 uint8 num_keys
0x4A uint8 unk Added in 1.12.x client branch
AuthLogonProof_Server
Offset Type Name Description
0x0 uint8 command 0x1
0x1 uint8 error
0x2 uint8[20] m2
0x16 uint32 unk1
0x1A uint32 unk2
0x1E uint32 unk3