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[+] TCP

pull/109/head
Azalea 2025-01-13 05:21:23 -05:00
parent 18d95a1ccd
commit 661af76ed6
1 changed files with 71 additions and 24 deletions
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95
src/main/java/icu/samnyan/aqua/sega/maimai2/MaimaiFutari.kt
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@ -7,6 +7,7 @@ import java.io.InputStreamReader
import java.io.OutputStreamWriter
import java.net.ServerSocket
import java.net.Socket
import java.net.SocketTimeoutException
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.locks.ReentrantLock
import kotlin.collections.set
@ -14,15 +15,18 @@ import kotlin.concurrent.withLock
const val PROTO_VERSION = 1
const val MAX_STREAMS = 10
const val SO_TIMEOUT = 10000
private object Command {
// Control plane
const val CTL_START = 1
const val CTL_BIND = 2
const val CTL_HEARTBEAT = 3
const val CTL_TCP_ACCEPT = 4 // Accept a new multiplexed TCP stream
const val CTL_TCP_CONNECT = 5
const val CTL_TCP_CLOSE = 6
const val CTL_TCP_CONNECT = 4 // Accept a new multiplexed TCP stream
const val CTL_TCP_ACCEPT = 5
const val CTL_TCP_ACCEPT_ACK = 6
const val CTL_TCP_CLOSE = 7
// Data plane
const val DATA_SEND = 21
@ -47,22 +51,25 @@ data class Message(
val data: Any? = null
)
fun ctlMsg(cmd: Int, data: Any? = null) = Message(cmd, 0, data = data)
fun ctlMsg(cmd: Int, data: Any? = null) = Message(cmd, data = data)
data class ActiveClient(
val clientKey: String,
val socket: Socket,
val reader: BufferedReader,
val writer: BufferedWriter
val writer: BufferedWriter,
// <Stream ID, Destination client stub IP>
val tcpStreams: MutableMap<Int, UInt> = mutableMapOf(),
val pendingStreams: MutableSet<Int> = mutableSetOf(),
) {
val log = logger()
val stubIp = keychipToStubIp(clientKey)
val mutex = ReentrantLock()
val writeMutex = ReentrantLock()
var lastHeartbeat = millis()
fun send(msg: Message) {
mutex.withLock {
writeMutex.withLock {
writer.write(msg.toJson())
writer.newLine()
writer.flush()
@ -70,21 +77,57 @@ data class ActiveClient(
}
}
fun ActiveClient.handle(message: Message) {
when (message.cmd) {
Command.CTL_HEARTBEAT -> lastHeartbeat = millis()
Command.DATA_SEND -> {
// Find target by dst IP address
val target = message.dst?.let { clients[it] } ?: return log.warn("Target not found: ${message.dst}")
fun ActiveClient.handle(msg: Message) {
// Find target by dst IP address or TCP stream ID
val target = (msg.dst ?: msg.sid?.let { tcpStreams[it] } )?.let { clients[it] }
// Send to target TODO: SID
target.send(message.copy(sid = 0))
}
when (msg.cmd) {
Command.CTL_HEARTBEAT -> lastHeartbeat = millis()
Command.DATA_BROADCAST -> {
// Broadcast to all clients. This is only used in UDP so SID is always 0
assert(message.proto == Proto.UDP)
clients.values.filter { it.clientKey != clientKey }
.forEach { it.send(message.copy(sid = 0, src = stubIp)) }
if (msg.proto != Proto.UDP) return log.warn("TCP Broadcast received, something is wrong.")
clients.values.filter { it.clientKey != clientKey }.forEach { it.send(msg.copy(src = stubIp)) }
}
Command.DATA_SEND, Command.CTL_TCP_ACCEPT_ACK -> {
target ?: return log.warn("Send: Target not found: ${msg.dst}")
if (msg.proto == Proto.TCP && msg.sid !in tcpStreams)
return log.warn("Stream ID not found: ${msg.sid}")
target.send(msg.copy(src = stubIp, dst = target.stubIp))
// 1020844165
// 2245580860
}
Command.CTL_TCP_CONNECT -> {
target ?: return log.warn("Connect: Target not found: ${msg.dst}")
msg.sid ?: return log.warn("Connect: Stream ID not found")
if (msg.sid in tcpStreams || msg.sid in pendingStreams)
return log.warn("Stream ID already in use: ${msg.sid}")
// Add the stream to the pending list
pendingStreams.add(msg.sid)
if (pendingStreams.size > MAX_STREAMS) {
log.warn("Too many pending streams, closing connection")
return socket.close()
}
target.send(msg.copy(src = stubIp, dst = target.stubIp))
}
Command.CTL_TCP_ACCEPT -> {
target ?: return log.warn("Accept: Target not found: ${msg.dst}")
msg.sid ?: return log.warn("Accept: Stream ID not found")
if (msg.sid !in target.pendingStreams)
return log.warn("Stream ID not found in pending list: ${msg.sid}")
// Add the stream to the active list
target.pendingStreams.remove(msg.sid)
target.tcpStreams[msg.sid] = stubIp
tcpStreams[msg.sid] = target.stubIp
target.send(msg.copy(src = stubIp, dst = target.stubIp))
}
}
}
@ -105,7 +148,10 @@ class MaimaiFutari(private val port: Int = 20101) {
log.info("Server started on port $port")
while (true) {
val clientSocket = serverSocket.accept()
val clientSocket = serverSocket.accept().apply {
soTimeout = SO_TIMEOUT
log.info("[+] Client connected: $remoteSocketAddress")
}
thread { handleClient(clientSocket) }
}
}
@ -126,9 +172,10 @@ class MaimaiFutari(private val port: Int = 20101) {
Command.CTL_START -> {
val id = message.data as String
val client = ActiveClient(id, socket, reader, writer)
clients[client.stubIp]?.socket?.close()
clients[client.stubIp] = client
handler = clients[client.stubIp]
log.info("[+] Client registered: $id")
log.info("[+] Client registered: ${socket.remoteSocketAddress} -> $id")
// Send back the version
handler?.send(ctlMsg(Command.CTL_START, mapOf("version" to PROTO_VERSION)))
@ -141,13 +188,13 @@ class MaimaiFutari(private val port: Int = 20101) {
}
}
} catch (e: Exception) {
if (e.message == "Connection reset") {
log.info("[-] Client disconnected: ${handler?.clientKey}")
} else log.error("Error in client handler", e)
if (e.message != "Connection reset" && e !is SocketTimeoutException)
log.error("Error in client handler", e)
} finally {
// Remove client
handler?.stubIp?.let { clients.remove(it) }
socket.close()
log.info("[-] Client disconnected: ${handler?.clientKey}")
}
}
}