Core Protocol

This protocol is UDP and bi-directional. It can be thought of as another layer within an application's network layer. Subgame, ASSS, Continuum, VIE's SubSpace client, the Directory server, and the Billing Server utilize this protocol, though Grelminar has designed a TCP Billing Server protocol.

There is support for reliable ordered packets, large packets and cluster packets.

• The maximum packet size is 520 bytes
• All integers are little endian
• All core packets begin with the type byte 0x00

0x01 login
offset size comment
0      1    type 0x00
1      1    type 0x01
2      4    client key
6      2    protocol version (vie = 0x01, ctm = 0x11)

0x02 login response
offset size comment
0      1    type 0x00
1      1    type 0x02
2      4    ~client key (negative)

0x03 reliable header
offset size comment
0      1    type 0x00
1      1    type 0x03
2      4    packet id
6      ?    payload (514 max)

0x04 reliable acknowledge
offset size comment
0      1    type 0x00
1      1    type 0x04
2      4    packet id

0x05 sync
offset size comment
0      1    type 0x00
1      1    type 0x05
2      4    local time
6      4    packets sent
10     4    packets received

0x06 sync response
offset size comment
0      1    type 0x00
1      1    type 0x06
2      4    time from last received 0x05 packet
6      4    server time

0x07 disconnect
offset size comment
0      1    type 0x00
1      1    type 0x07

0x08 small chunk
offset size comment
0      1    type 0x00
1      1    type 0x08
2      ?    payload (expect 472 max)
keep appending payloads until 0x09 chunk tail is received

0x09 chunk tail
offset size comment
0      1    type 0x00
1      1    type 0x09
2      ?    payload (expect 472 or less)
append this payload then process contents as a non-core packet

0x0A stream
offset size comment
0      1    type 0x00
1      1    type 0x0A
2      4    total length of all segments
6      ?    payload (expect 468 max)
keep appending payloads until total length is reached then process contents as
a non-core packet.

0x0B cancel stream request
offset size comment
0      1    type 0x00
1      1    type 0x0B

0x0C cancel stream acknowledge
offset size comment
0      1    type 0x00
1      1    type 0x0C

0x0E cluster
offset size comment
0      1    type 0x00
1      1    type 0x0E
2      1    length
3      ?    payload with length as above
packet repeats from offset 2 until end, process contents as arbitrary packet