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packets.js
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packets.js
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import * as crypto from 'node:crypto'
function sign(secret, buf) {
return crypto.createHmac('sha256', secret).update(buf).digest()
}
// Intended to be sent from creators to rally-point.
// Asks rally-point to create a new route for 2 specified player IDs.
export const MSG_CREATE_ROUTE = 0x00
export const LENGTH_MSG_CREATE_ROUTE = 1 + 4 /* player 1 ID */ + 4 /* player 2 ID */ + 32 /* mac */
export const CreateRoute = {
create(secret, playerOneId, playerTwoId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_CREATE_ROUTE)
msg.writeUInt8(MSG_CREATE_ROUTE, 0)
msg.writeUInt32LE(playerOneId, 1)
msg.writeUInt32LE(playerTwoId, 5)
const signature = sign(secret, msg.slice(0, 1 + 4 + 4))
signature.copy(msg, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_CREATE_ROUTE
},
verifySignature(secret, msg) {
const data = msg.slice(0, 1 + 4 + 4)
const signature = msg.slice(data.length)
const expected = crypto.createHmac('sha256', secret).update(data).digest()
let matching = true
// don't break early here to avoid exposing when the signature mismatched via timing
for (let i = 0; i < expected.length; i++) {
if (expected[i] !== signature[i]) {
matching = false
}
}
return matching
},
getPlayerOneId(msg) {
return msg.readUInt32LE(1)
},
getPlayerTwoId(msg) {
return msg.readUInt32LE(5)
},
}
// Intended to be sent from rally-point to creators.
// Indicates that their route creation request was successful and provides a unique route
// identifier that players must use to join the route.
export const MSG_CREATE_ROUTE_SUCCESS = 0x01
export const LENGTH_MSG_CREATE_ROUTE_SUCCESS =
1 + 4 /* player 1 ID */ + 4 /* player 2 ID */ + 8 /* route ID */
export const CreateRouteSuccess = {
create(playerOneId, playerTwoId, routeId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_CREATE_ROUTE_SUCCESS)
msg.writeUInt8(MSG_CREATE_ROUTE_SUCCESS, 0)
msg.writeUInt32LE(playerOneId, 1)
msg.writeUInt32LE(playerTwoId, 5)
msg.write(routeId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_CREATE_ROUTE_SUCCESS
},
getPlayerOneId(msg) {
return msg.readUInt32LE(1)
},
getPlayerTwoId(msg) {
return msg.readUInt32LE(5)
},
getRouteId(msg) {
return msg.toString('utf8', 1 + 4 + 4)
},
}
// Intended to be sent from creators to rally-point.
// Indicates that the creator received the route success message.
export const MSG_CREATE_ROUTE_SUCCESS_ACK = 0x02
export const LENGTH_MSG_CREATE_ROUTE_SUCCESS_ACK = 1 + 8 /* route ID */
export const CreateRouteSuccessAck = {
create(routeId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_CREATE_ROUTE_SUCCESS_ACK)
msg.writeUInt8(MSG_CREATE_ROUTE_SUCCESS_ACK, 0)
msg.write(routeId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_CREATE_ROUTE_SUCCESS_ACK
},
getRouteId(msg) {
return msg.toString('utf8', 1)
},
}
// Intended to be sent from rally-point to creators.
// Indicates that the route creation request has failed.
// Failures are generally for programming/signing errors, no other failures should generally occur.
export const MSG_CREATE_ROUTE_FAILURE = 0x03
export const LENGTH_MSG_CREATE_ROUTE_FAILURE =
1 + 4 /* player 1 ID */ + 4 /* player 2 ID */ + 8 /* failure ID */
export const CreateRouteFailure = {
create(playerOneId, playerTwoId, failureId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_CREATE_ROUTE_FAILURE)
msg.writeUInt8(MSG_CREATE_ROUTE_FAILURE, 0)
msg.writeUInt32LE(playerOneId, 1)
msg.writeUInt32LE(playerTwoId, 5)
msg.write(failureId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_CREATE_ROUTE_FAILURE
},
getPlayerOneId(msg) {
return msg.readUInt32LE(1)
},
getPlayerTwoId(msg) {
return msg.readUInt32LE(5)
},
getFailureId(msg) {
return msg.toString('utf8', 1 + 4 + 4)
},
}
// Intended to be sent from creators to rally-point.
// Indicates that the creator has received notification that their request failed.
export const MSG_CREATE_ROUTE_FAILURE_ACK = 0x04
export const LENGTH_MSG_CREATE_ROUTE_FAILURE_ACK = 1 + 8 /* failure ID */
export const CreateRouteFailureAck = {
create(failureId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_CREATE_ROUTE_FAILURE_ACK)
msg.writeUInt8(MSG_CREATE_ROUTE_FAILURE_ACK, 0)
msg.write(failureId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_CREATE_ROUTE_FAILURE_ACK
},
getFailureId(msg) {
return msg.toString('utf8', 1)
},
}
// Intended to be sent from players to rally-point
// Indicates that the player wants to join a particular route ID (and set their connection as one of
// the endpoints for it)
export const MSG_JOIN_ROUTE = 0x05
export const LENGTH_MSG_JOIN_ROUTE = 1 + 8 /* route ID */ + 4 /* player ID */
export const JoinRoute = {
create(routeId, playerId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_JOIN_ROUTE)
msg.writeUInt8(MSG_JOIN_ROUTE, 0)
msg.write(routeId, 1)
msg.writeUInt32LE(playerId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_JOIN_ROUTE
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getPlayerId(msg) {
return msg.readUInt32LE(9)
},
}
// Intended to be sent from rally-point to players
// Indicates that the player has successfully joined the route requested
export const MSG_JOIN_ROUTE_SUCCESS = 0x06
export const LENGTH_MSG_JOIN_ROUTE_SUCCESS = 1 + 8 /* routeID */
export const JoinRouteSuccess = {
create(routeId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_JOIN_ROUTE_SUCCESS)
msg.writeUInt8(MSG_JOIN_ROUTE_SUCCESS, 0)
msg.write(routeId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_JOIN_ROUTE_SUCCESS
},
getRouteId(msg) {
return msg.toString('utf8', 1)
},
}
// Intended to be sent from players to rally-point
// Indicates that they've received notification that they've successfully joined the route
export const MSG_JOIN_ROUTE_SUCCESS_ACK = 0x07
export const LENGTH_MSG_JOIN_ROUTE_SUCCESS_ACK = 1 + 8 /* routeID */ + 4 /* playerID */
export const JoinRouteSuccessAck = {
create(routeId, playerId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_JOIN_ROUTE_SUCCESS_ACK)
msg.writeUInt8(MSG_JOIN_ROUTE_SUCCESS_ACK, 0)
msg.write(routeId, 1)
msg.writeUInt32LE(playerId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_JOIN_ROUTE_SUCCESS_ACK
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getPlayerId(msg) {
return msg.readUInt32LE(9)
},
}
// Intended to be sent from rally-point to players
// Indicates that the player's join request has failed
export const MSG_JOIN_ROUTE_FAILURE = 0x08
export const LENGTH_MSG_JOIN_ROUTE_FAILURE = 1 + 8 /* routeID */ + 8 /* failureID */
export const JoinRouteFailure = {
create(routeId, failureId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_JOIN_ROUTE_FAILURE)
msg.writeUInt8(MSG_JOIN_ROUTE_FAILURE, 0)
msg.write(routeId, 1)
msg.write(failureId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_JOIN_ROUTE_FAILURE
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getFailureId(msg) {
return msg.toString('utf8', 9)
},
}
// Intended to be sent from players to rally-point.
// Indicates that the player has received notification that their join request failed.
export const MSG_JOIN_ROUTE_FAILURE_ACK = 0x09
export const LENGTH_MSG_JOIN_ROUTE_FAILURE_ACK = 1 + 8 /* failure ID */
export const JoinRouteFailureAck = {
create(failureId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_JOIN_ROUTE_FAILURE_ACK)
msg.writeUInt8(MSG_JOIN_ROUTE_FAILURE_ACK, 0)
msg.write(failureId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_JOIN_ROUTE_FAILURE_ACK
},
getFailureId(msg) {
return msg.toString('utf8', 1)
},
}
// Intended to be sent from rally-point to players.
// Indicates that the specified route has both players and is ready to use for forwarding.
export const MSG_ROUTE_READY = 0x0a
export const LENGTH_MSG_ROUTE_READY = 1 + 8 /* route ID */
export const RouteReady = {
create(routeId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_ROUTE_READY)
msg.writeUInt8(MSG_ROUTE_READY, 0)
msg.write(routeId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_ROUTE_READY
},
getRouteId(msg) {
return msg.toString('utf8', 1)
},
}
// Intended to be sent from players to rally-point.
// Indicates that the player received the notification of route readiness.
export const MSG_ROUTE_READY_ACK = 0x0b
export const LENGTH_MSG_ROUTE_READY_ACK = 1 + 8 /* route ID */ + 4 /* player ID */
export const RouteReadyAck = {
create(routeId, playerId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_ROUTE_READY_ACK)
msg.writeUInt8(MSG_ROUTE_READY_ACK, 0)
msg.write(routeId, 1)
msg.writeUInt32LE(playerId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_ROUTE_READY_ACK
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getPlayerId(msg) {
return msg.readUInt32LE(9)
},
}
// Intended to be sent between players and rally-point (from either side)
// rally-point should send a keep-alive in response to this packet from a player
export const MSG_KEEP_ALIVE = 0x0c
export const LENGTH_MSG_KEEP_ALIVE = 1 + 8 /* route ID */ + 4 /* player ID */
export const KeepAlive = {
create(routeId, playerId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_KEEP_ALIVE)
msg.writeUInt8(MSG_KEEP_ALIVE, 0)
msg.write(routeId, 1)
msg.writeUInt32LE(playerId, 9)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_KEEP_ALIVE
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getPlayerId(msg) {
return msg.readUInt32LE(9)
},
}
// Intended to be sent from rally-point to players
// Contains data that the other player forwards to this one
export const MSG_RECEIVE = 0x0d
export const MIN_LENGTH_MSG_RECEIVE = 1 + 8 /* route ID */
export const Receive = {
create(routeId, data, dataStart = 0, dataEnd) {
const end = dataEnd === undefined ? data.length : dataEnd
const msg = Buffer.allocUnsafe(MIN_LENGTH_MSG_RECEIVE + (end - dataStart))
msg.writeUInt8(MSG_RECEIVE, 0)
msg.write(routeId, 1)
data.copy(msg, 9, dataStart, dataEnd)
return msg
},
validate(msg) {
return msg.length >= MIN_LENGTH_MSG_RECEIVE
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getData(msg) {
return msg.slice(9)
},
}
// Intended to be sent from players to rally-point
// Contains data that a player wants to forward to the other player
export const MSG_FORWARD = 0x0e
export const MIN_LENGTH_MSG_FORWARD = 1 + 8 /* route ID */ + 4 /* player ID */
export const Forward = {
create(routeId, playerId, data) {
const msg = Buffer.allocUnsafe(MIN_LENGTH_MSG_FORWARD + data.length)
msg.writeUInt8(MSG_FORWARD, 0)
msg.write(routeId, 1)
msg.writeUInt32LE(playerId, 9)
data.copy(msg, 13)
return msg
},
validate(msg) {
return msg.length >= MIN_LENGTH_MSG_FORWARD
},
getRouteId(msg) {
return msg.toString('utf8', 1, 9)
},
getPlayerId(msg) {
return msg.readUInt32LE(9)
},
getData(msg) {
return msg.slice(13)
},
toReceive(msg) {
return Receive.create(Forward.getRouteId(msg), msg, 13)
},
}
// Intended to be sent from players to rally-point and back
// Contains an ID that the player can use to identify the source packet
export const MSG_PING = 0x0f
export const LENGTH_MSG_PING = 1 + 4 /* ping ID */
export const Ping = {
create(pingId) {
const msg = Buffer.allocUnsafe(LENGTH_MSG_PING)
msg.writeUInt8(MSG_PING, 0)
msg.writeUInt32LE(pingId, 1)
return msg
},
validate(msg) {
return msg.length === LENGTH_MSG_PING
},
getPingId(msg) {
return msg.readUInt32LE(1)
},
}