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Added an unfinished doc on how groupchats work.

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irungentoo 2014-11-16 20:59:10 -05:00
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docs/Group-Chats.md
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Massive public group chats.
Group chats.
Note that not all this document has been implemented: only private (invite only) group chats are currently implemented.
Note: we assume everyone in the chat trusts each other.
Everyone generates a short term public private key pair right before joining
the chat.
These group chats work by temporarily adding the 4 "closest" people defined by a distance function
in group.c in order to form a circle of connected peers. These peers then relay messages to each other.
Note that for public group chats it is impossible to protect the chat from
being spied on by a very dedicated attacker, encryption is therefor used as a
form of spam/access control.
## Joining the chats
A friend invites another friend to a group chat by sending them an invite packet. The friend either ignores
the invite or responds with a response packet if he wants to join the chat. The friend invite contains the type
of groupchat (text only, A/V) the friend is being invited to.
TODO: write more of this.
## Protocol
Invite packets:
Invite packet:
[uint8_t id 96][uint8_t id 0][uint16_t group chat number][33 bytes group chat identifier[1 byte type][32 bytes id]]
Node format:
See DHT, currently uses the IPv6 Node_format.
Get nodes (Request):
Packet contents:
```
[char with a value of 48][Bob's (The receiver's) Public key (client_id) (32 bytes))][Alice's (The sender's) Public key (client_id) (32 bytes)][Random nonce (24 bytes)][Encrypted with the nonce, private key of the sender and public key of the receiver:[char with a value of 48][random 8 byte (ping_id)]
```
Valid replies: a send_nodes packet
Send_nodes (response):
```
[char with a value of 48][Bob's (The receiver's) Public key (client_id) (32 bytes))][Alice's (The sender's) Public key (client_id) (32 bytes)][Random nonce (24 bytes)][Encrypted with the nonce, private key of the sender and public key of the receiver:[char with a value of 49][random 8 byte (ping_id)][Nodes in node format, length=40 * (number of nodes (maximum of 6 nodes)) bytes]]
```
Broadcast packet:
```
[char with a value of 48][Bob's (The receiver's) Public key (client_id) (32 bytes))][Alice's (The sender's) Public key (client_id) (32 bytes)][nonce][Encrypted with the nonce, private key of the sender and public key of the receiver:[char with a value of 50][Data to send to everyone]]
```
Response packet
[uint8_t id 96][uint8_t id 1][uint16_t group chat number(local)][uint16_t group chat number to join][33 bytes group chat identifier[1 byte type][32 bytes id]]
Data to send to everyone:
TODO: signing and spam control + permissions.
[client_id of sender][uint32_t message number][char with a value representing id of message][data]
Peer online packet:
[uint8_t id 97][uint16_t group chat number][33 bytes group chat identifier[1 byte type][32 bytes id]]
Peer leave packet:
[uint8_t id 98][uint16_t group chat number][uint8_t id 1]
Peer query packet:
[uint8_t id 98][uint16_t group chat number][uint8_t id 4]
Peer response packet:
[uint8_t id 98][uint16_t group chat number][uint8_t id 5][Repeated times number of peers: [uint16_t peer num][uint8_t 32bytes real public key][uint8_t 32bytes temp DHT public key][uint8_t name length][name]]
Message packets:
[uint8_t id 99][uint16_t group chat number][uint16_t peer number][uint32_t message number][uint8_t with a value representing id of message][data]
Lossy Message packets:
[uint8_t id 199][uint16_t group chat number][uint16_t peer number][uint16_t message number][uint8_t with a value representing id of message][data]
Group chat types:
0: text
1: AV
Note: the message number is increased by 1 for each sent message.
@ -49,14 +54,10 @@ No data.
16 - new_peer
Tell everyone about a new peer in the chat.
[uint8_t public_key[public_key_len]]
[uint16_t peer_num][uint8_t 32bytes real public key][uint8_t 32bytes temp DHT public key]
17 - ban_peer
Ban a peer
[uint8_t public_key[public_key_len]]
18 - topic change
[uint8_t topic[topiclen]]
17 - kill_peer
[uint16_t peer_num]
48 - name change
[uint8_t name[namelen]]
@ -69,3 +70,6 @@ Ban a peer
65 - action (/me)
[uint8_t message[messagelen]]