mirror of
https://github.com/permissionlesstech/bitchat.git
synced 2026-07-25 21:05:20 +00:00
Analyze scalability and prepare for TestFlight
- Deep analysis of mesh network scalability limits - Current full mesh topology supports ~20-30 users maximum - Identified bottlenecks: O(n²) connections, message flooding, battery impact - Documented future scaling solutions: hierarchical topology, DHT routing - Ready for TestFlight submission with current capacity constraints
This commit is contained in:
jack
@@ -65,6 +65,15 @@ class BluetoothMeshService: NSObject {
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private var batteryMonitorTimer: Timer?
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private var currentBatteryLevel: Float = 1.0 // Default to full battery
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// Cover traffic for privacy
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private var coverTrafficTimer: Timer?
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private let coverTrafficPrefix = "☂DUMMY☂" // Prefix to identify dummy messages after decryption
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private var lastCoverTrafficTime = Date()
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// Timing randomization for privacy
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private let minMessageDelay: TimeInterval = 0.05 // 50ms minimum
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private let maxMessageDelay: TimeInterval = 0.5 // 500ms maximum
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// Fragment handling
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private var incomingFragments: [String: [Int: Data]] = [:] // fragmentID -> [index: data]
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private var fragmentMetadata: [String: (originalType: UInt8, totalFragments: Int, timestamp: Date)] = [:]
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@@ -116,6 +125,8 @@ class BluetoothMeshService: NSObject {
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deinit {
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cleanup()
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scanDutyCycleTimer?.invalidate()
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batteryMonitorTimer?.invalidate()
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coverTrafficTimer?.invalidate()
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}
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@objc private func appWillTerminate() {
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@@ -171,6 +182,12 @@ class BluetoothMeshService: NSObject {
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DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { [weak self] in
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self?.sendBroadcastAnnounce()
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}
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// Start battery monitoring
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startBatteryMonitoring()
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// Start cover traffic for privacy
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startCoverTraffic()
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}
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func sendBroadcastAnnounce() {
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@@ -184,14 +201,20 @@ class BluetoothMeshService: NSObject {
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)
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print("[ANNOUNCE] Sending proactive broadcast announce with nickname: \(vm.nickname)")
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broadcastPacket(announcePacket)
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// Send multiple times for reliability
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for delay in [0.5, 1.0, 2.0] {
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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// Initial send with random delay
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let initialDelay = self.randomDelay()
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DispatchQueue.main.asyncAfter(deadline: .now() + initialDelay) { [weak self] in
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self?.broadcastPacket(announcePacket)
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}
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// Send multiple times for reliability with jittered delays
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for baseDelay in [0.5, 1.0, 2.0] {
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let jitteredDelay = baseDelay + self.randomDelay()
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DispatchQueue.main.asyncAfter(deadline: .now() + jitteredDelay) { [weak self] in
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guard let self = self else { return }
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self.broadcastPacket(announcePacket)
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// [ANNOUNCE] Re-sending broadcast announce
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// [ANNOUNCE] Re-sending broadcast announce with jitter
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}
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}
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}
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@@ -309,24 +332,31 @@ class BluetoothMeshService: NSObject {
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signature = nil
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}
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// Use unified message type with broadcast recipient
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let packet = BitchatPacket(
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type: MessageType.message.rawValue,
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senderID: Data(self.myPeerID.utf8),
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recipientID: nil,
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recipientID: SpecialRecipients.broadcast, // Special broadcast ID
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timestamp: UInt64(Date().timeIntervalSince1970),
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payload: messageData,
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signature: signature,
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ttl: self.maxTTL
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)
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self.broadcastPacket(packet)
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print("[MESSAGE] Sending: \(content)")
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// Add random delay before initial send
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let initialDelay = self.randomDelay()
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DispatchQueue.main.asyncAfter(deadline: .now() + initialDelay) { [weak self] in
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self?.broadcastPacket(packet)
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print("[MESSAGE] Sending: \(content) (delayed by \(Int(initialDelay * 1000))ms)")
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}
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// Retry for reliability (like announces)
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for delay in [0.2, 0.5] {
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self, packet] in
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// Retry with randomized delays for reliability
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let baseDelays = [0.2, 0.5]
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for baseDelay in baseDelays {
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let jitteredDelay = baseDelay + self.randomDelay()
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DispatchQueue.main.asyncAfter(deadline: .now() + jitteredDelay) { [weak self] in
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self?.broadcastPacket(packet)
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// Re-sending message
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// Re-sending message with jitter
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}
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}
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}
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@@ -353,10 +383,15 @@ class BluetoothMeshService: NSObject {
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)
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if let messageData = message.toBinaryPayload() {
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// Encrypt the message for the recipient
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// Pad message to standard block size for privacy
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let blockSize = MessagePadding.optimalBlockSize(for: messageData.count)
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let paddedData = MessagePadding.pad(messageData, toSize: blockSize)
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print("[PRIVACY] Padded message from \(messageData.count) to \(paddedData.count) bytes")
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// Encrypt the padded message for the recipient
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let encryptedPayload: Data
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do {
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encryptedPayload = try self.encryptionService.encrypt(messageData, for: recipientPeerID)
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encryptedPayload = try self.encryptionService.encrypt(paddedData, for: recipientPeerID)
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print("[CRYPTO] Successfully encrypted private message for \(recipientPeerID)")
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} catch {
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print("[CRYPTO] Failed to encrypt private message: \(error)")
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@@ -376,7 +411,7 @@ class BluetoothMeshService: NSObject {
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// Create packet with recipient ID for proper routing
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let packet = BitchatPacket(
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type: MessageType.privateMessage.rawValue,
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type: MessageType.message.rawValue,
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senderID: Data(self.myPeerID.utf8),
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recipientID: Data(recipientPeerID.utf8),
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timestamp: UInt64(Date().timeIntervalSince1970),
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@@ -386,7 +421,13 @@ class BluetoothMeshService: NSObject {
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)
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print("[PRIVATE] Sending encrypted message to \(recipientPeerID): \(content)")
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self.broadcastPacket(packet)
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// Add random delay for timing obfuscation
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let delay = self.randomDelay()
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self] in
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self?.broadcastPacket(packet)
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print("[PRIVACY] Private message sent with \(Int(delay * 1000))ms delay")
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}
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// Don't call didReceiveMessage here - let the view model handle it directly
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}
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@@ -515,7 +556,6 @@ class BluetoothMeshService: NSObject {
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guard packet.type != MessageType.keyExchange.rawValue,
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packet.type != MessageType.announce.rawValue,
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packet.type != MessageType.leave.rawValue,
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packet.type != MessageType.ack.rawValue,
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packet.type != MessageType.fragmentStart.rawValue,
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packet.type != MessageType.fragmentContinue.rawValue,
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packet.type != MessageType.fragmentEnd.rawValue else {
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@@ -524,7 +564,7 @@ class BluetoothMeshService: NSObject {
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// Check if this is a private message for a favorite
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var isForFavorite = false
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if packet.type == MessageType.privateMessage.rawValue,
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if packet.type == MessageType.message.rawValue,
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let recipientID = packet.recipientID,
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let recipientPeerID = String(data: recipientID.trimmingNullBytes(), encoding: .utf8) {
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// Check if recipient is a favorite via their public key fingerprint
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@@ -612,9 +652,8 @@ class BluetoothMeshService: NSObject {
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for (index, storedMessage) in messagesToSend.enumerated() {
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let delay = Double(index) * 0.1 // 100ms between messages
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak self, weak peripheral] in
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guard let self = self,
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let peripheral = peripheral,
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DispatchQueue.main.asyncAfter(deadline: .now() + delay) { [weak peripheral] in
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guard let peripheral = peripheral,
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peripheral.state == .connected else { return }
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// Create a new packet with fresh timestamp
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@@ -744,7 +783,7 @@ class BluetoothMeshService: NSObject {
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switch MessageType(rawValue: packet.type) {
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case .message:
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// Process broadcast message (no decryption needed)
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// Unified message handler for both broadcast and private messages
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guard let senderID = String(data: packet.senderID.trimmingNullBytes(), encoding: .utf8) else {
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return
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}
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@@ -754,45 +793,138 @@ class BluetoothMeshService: NSObject {
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return
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}
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// Verify signature if present
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if let signature = packet.signature {
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do {
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let isValid = try encryptionService.verify(signature, for: packet.payload, from: senderID)
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if !isValid {
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print("[CRYPTO] Invalid signature from \(senderID), dropping message")
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// Check if this is a broadcast or private message
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if let recipientID = packet.recipientID {
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if recipientID == SpecialRecipients.broadcast {
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// BROADCAST MESSAGE
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print("[MESSAGE] Received broadcast message")
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// Verify signature if present
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if let signature = packet.signature {
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do {
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let isValid = try encryptionService.verify(signature, for: packet.payload, from: senderID)
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if !isValid {
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print("[CRYPTO] Invalid signature from \(senderID), dropping message")
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return
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}
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} catch {
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print("[CRYPTO] Failed to verify signature from \(senderID): \(error)")
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}
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}
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// Parse broadcast message (not encrypted)
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if let message = BitchatMessage.fromBinaryPayload(packet.payload) {
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print("[MESSAGE] Broadcast from \(message.sender): \(message.content)")
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// Store nickname mapping
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peerNicknames[senderID] = message.sender
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let messageWithPeerID = BitchatMessage(
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sender: message.sender,
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content: message.content,
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timestamp: message.timestamp,
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isRelay: message.isRelay,
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originalSender: message.originalSender,
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isPrivate: false,
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recipientNickname: nil,
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senderPeerID: senderID,
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mentions: message.mentions
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)
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DispatchQueue.main.async {
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self.delegate?.didReceiveMessage(messageWithPeerID)
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}
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}
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// Relay if TTL > 0
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var relayPacket = packet
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relayPacket.ttl -= 1
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if relayPacket.ttl > 0 {
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self.cacheMessage(relayPacket, messageID: messageID)
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self.broadcastPacket(relayPacket)
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}
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} else if let recipientIDString = String(data: recipientID.trimmingNullBytes(), encoding: .utf8),
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recipientIDString == myPeerID {
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// PRIVATE MESSAGE FOR US
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print("[MESSAGE] Received private message for us")
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// Verify signature if present
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if let signature = packet.signature {
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do {
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let isValid = try encryptionService.verify(signature, for: packet.payload, from: senderID)
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if !isValid {
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print("[CRYPTO] Invalid signature on private message from \(senderID), dropping")
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return
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}
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} catch {
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print("[CRYPTO] Failed to verify signature from \(senderID): \(error)")
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}
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}
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// Decrypt the message
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let decryptedPayload: Data
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do {
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let decryptedPadded = try encryptionService.decrypt(packet.payload, from: senderID)
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print("[CRYPTO] Successfully decrypted private message from \(senderID)")
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// Remove padding
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decryptedPayload = MessagePadding.unpad(decryptedPadded)
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print("[PRIVACY] Unpadded message from \(decryptedPadded.count) to \(decryptedPayload.count) bytes")
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} catch {
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print("[CRYPTO] Failed to decrypt private message from \(senderID): \(error)")
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return
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}
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// Valid signature
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} catch {
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print("[CRYPTO] Failed to verify signature from \(senderID): \(error)")
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// If we don't have the public key yet, continue without verification
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// Continuing without signature verification
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}
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} else {
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print("[CRYPTO] No signature present in message from \(senderID)")
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}
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let messagePayload = packet.payload
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if let message = BitchatMessage.fromBinaryPayload(messagePayload) {
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print("[MESSAGE] Received from \(message.sender): \(message.content)")
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// Store nickname mapping
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if let senderID = String(data: packet.senderID.trimmingNullBytes(), encoding: .utf8) {
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peerNicknames[senderID] = message.sender
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}
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DispatchQueue.main.async {
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self.delegate?.didReceiveMessage(message)
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}
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var relayPacket = packet
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relayPacket.ttl -= 1
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if relayPacket.ttl > 0 {
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// Parse the decrypted message
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if let message = BitchatMessage.fromBinaryPayload(decryptedPayload) {
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// Check if this is a dummy message for cover traffic
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if message.content.hasPrefix(self.coverTrafficPrefix) {
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print("[PRIVACY] Received and discarded cover traffic from \(senderID)")
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return // Silently discard dummy messages
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}
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print("[MESSAGE] Private from \(senderID): \(message.content)")
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// Store nickname mapping if we don't have it
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if peerNicknames[senderID] == nil {
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peerNicknames[senderID] = message.sender
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}
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let messageWithPeerID = BitchatMessage(
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sender: message.sender,
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content: message.content,
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timestamp: message.timestamp,
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isRelay: message.isRelay,
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originalSender: message.originalSender,
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isPrivate: message.isPrivate,
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recipientNickname: message.recipientNickname,
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senderPeerID: senderID
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)
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DispatchQueue.main.async {
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self.delegate?.didReceiveMessage(messageWithPeerID)
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}
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}
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} else if packet.ttl > 0 {
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// RELAY PRIVATE MESSAGE (not for us)
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print("[MESSAGE] Relaying private message not meant for us (TTL: \(packet.ttl))")
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var relayPacket = packet
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relayPacket.ttl -= 1
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// Check if this message is for an offline favorite and cache it
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if let recipientIDString = String(data: recipientID.trimmingNullBytes(), encoding: .utf8),
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let publicKeyData = self.encryptionService.getPeerIdentityKey(recipientIDString) {
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let fingerprint = self.getPublicKeyFingerprint(publicKeyData)
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if self.delegate?.isFavorite(fingerprint: fingerprint) ?? false {
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print("[CACHE] Caching relayed message for offline favorite: \(recipientIDString)")
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self.cacheMessage(relayPacket, messageID: messageID)
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}
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}
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self.broadcastPacket(relayPacket)
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}
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} else {
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print("[MESSAGE] Failed to parse message from payload")
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}
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case .keyExchange:
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@@ -944,105 +1076,9 @@ class BluetoothMeshService: NSObject {
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print("[LEAVE] Failed to parse leave packet")
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}
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case .privateMessage:
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print("[PRIVATE] Received private message packet")
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// Check if this private message is for us
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if let recipientID = packet.recipientID,
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let recipientIDString = String(data: recipientID.trimmingNullBytes(), encoding: .utf8) {
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print("[PRIVATE] Message recipient: \(recipientIDString), myPeerID: \(myPeerID)")
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if recipientIDString == myPeerID {
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// Get sender ID
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if let senderID = String(data: packet.senderID.trimmingNullBytes(), encoding: .utf8) {
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// Ignore our own messages
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if senderID == myPeerID {
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print("[PRIVATE] Ignoring own message")
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return
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}
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// Verify signature if present
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if let signature = packet.signature {
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do {
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let isValid = try encryptionService.verify(signature, for: packet.payload, from: senderID)
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if !isValid {
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print("[CRYPTO] Invalid signature on private message from \(senderID), dropping")
|
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return
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}
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print("[CRYPTO] Valid signature on private message from \(senderID)")
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} catch {
|
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print("[CRYPTO] Failed to verify signature from \(senderID): \(error)")
|
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// Continue without signature verification for now
|
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}
|
||||
}
|
||||
|
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// Decrypt the message
|
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let decryptedPayload: Data
|
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do {
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decryptedPayload = try encryptionService.decrypt(packet.payload, from: senderID)
|
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print("[CRYPTO] Successfully decrypted private message from \(senderID)")
|
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} catch {
|
||||
print("[CRYPTO] Failed to decrypt private message from \(senderID): \(error)")
|
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return
|
||||
}
|
||||
|
||||
// Parse the decrypted message
|
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if let message = BitchatMessage.fromBinaryPayload(decryptedPayload) {
|
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print("[PRIVATE] Received private message from \(senderID): \(message.content)")
|
||||
|
||||
// Store nickname mapping if we don't have it
|
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if peerNicknames[senderID] == nil {
|
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peerNicknames[senderID] = message.sender
|
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|
||||
// Update peer list to show the new nickname
|
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DispatchQueue.main.async {
|
||||
self.delegate?.didUpdatePeerList(self.getAllConnectedPeerIDs())
|
||||
}
|
||||
}
|
||||
|
||||
// Create a new message with the sender peer ID
|
||||
let messageWithPeerID = BitchatMessage(
|
||||
sender: message.sender,
|
||||
content: message.content,
|
||||
timestamp: message.timestamp,
|
||||
isRelay: message.isRelay,
|
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originalSender: message.originalSender,
|
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isPrivate: message.isPrivate,
|
||||
recipientNickname: message.recipientNickname,
|
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senderPeerID: senderID
|
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)
|
||||
|
||||
DispatchQueue.main.async {
|
||||
self.delegate?.didReceiveMessage(messageWithPeerID)
|
||||
}
|
||||
} else {
|
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print("[PRIVATE] Failed to parse decrypted message")
|
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}
|
||||
}
|
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} else if packet.ttl > 0 {
|
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// Relay private messages that aren't for us
|
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print("[PRIVATE] Relaying message not meant for us (TTL: \(packet.ttl))")
|
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var relayPacket = packet
|
||||
relayPacket.ttl -= 1
|
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|
||||
// Check if this message is for an offline favorite and cache it
|
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if let publicKeyData = self.encryptionService.getPeerIdentityKey(recipientIDString) {
|
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let fingerprint = self.getPublicKeyFingerprint(publicKeyData)
|
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if self.delegate?.isFavorite(fingerprint: fingerprint) ?? false {
|
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// This is for a favorite peer - cache it even if they're offline
|
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print("[CACHE] Caching relayed message for offline favorite: \(recipientIDString)")
|
||||
self.cacheMessage(relayPacket, messageID: messageID)
|
||||
}
|
||||
}
|
||||
|
||||
self.broadcastPacket(relayPacket)
|
||||
}
|
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} else {
|
||||
print("[PRIVATE] No recipient ID in packet")
|
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}
|
||||
|
||||
|
||||
case .fragmentStart, .fragmentContinue, .fragmentEnd:
|
||||
let fragmentTypeStr = packet.type == 10 ? "START" : (packet.type == 11 ? "CONTINUE" : "END")
|
||||
let fragmentTypeStr = packet.type == MessageType.fragmentStart.rawValue ? "START" :
|
||||
(packet.type == MessageType.fragmentContinue.rawValue ? "CONTINUE" : "END")
|
||||
print("[PACKET] Handling fragment type: \(fragmentTypeStr) (\(packet.type)), payload size: \(packet.payload.count), from: \(peerID)")
|
||||
|
||||
// Validate fragment has minimum required size
|
||||
@@ -1715,4 +1751,77 @@ extension BluetoothMeshService: CBPeripheralManagerDelegate {
|
||||
scheduleScanDutyCycle()
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: - Privacy Utilities
|
||||
|
||||
private func randomDelay() -> TimeInterval {
|
||||
// Generate random delay between min and max for timing obfuscation
|
||||
return TimeInterval.random(in: minMessageDelay...maxMessageDelay)
|
||||
}
|
||||
|
||||
// MARK: - Cover Traffic
|
||||
|
||||
private func startCoverTraffic() {
|
||||
// Start cover traffic with random interval
|
||||
scheduleCoverTraffic()
|
||||
}
|
||||
|
||||
private func scheduleCoverTraffic() {
|
||||
// Random interval between 30-120 seconds
|
||||
let interval = TimeInterval.random(in: 30...120)
|
||||
|
||||
coverTrafficTimer?.invalidate()
|
||||
coverTrafficTimer = Timer.scheduledTimer(withTimeInterval: interval, repeats: false) { [weak self] _ in
|
||||
self?.sendDummyMessage()
|
||||
self?.scheduleCoverTraffic() // Schedule next dummy message
|
||||
}
|
||||
}
|
||||
|
||||
private func sendDummyMessage() {
|
||||
// Only send dummy messages if we have connected peers
|
||||
let peers = getAllConnectedPeerIDs()
|
||||
guard !peers.isEmpty else { return }
|
||||
|
||||
// Skip if battery is low
|
||||
if currentBatteryLevel < 0.2 {
|
||||
print("[PRIVACY] Skipping cover traffic due to low battery")
|
||||
return
|
||||
}
|
||||
|
||||
// Pick a random peer to send to
|
||||
guard let randomPeer = peers.randomElement() else { return }
|
||||
|
||||
// Generate random dummy content
|
||||
let dummyContent = generateDummyContent()
|
||||
|
||||
print("[PRIVACY] Sending cover traffic to \(randomPeer)")
|
||||
|
||||
// Send as a private message so it's encrypted
|
||||
sendPrivateMessage(dummyContent, to: randomPeer, recipientNickname: peerNicknames[randomPeer] ?? "unknown")
|
||||
}
|
||||
|
||||
private func generateDummyContent() -> String {
|
||||
// Generate realistic-looking dummy messages
|
||||
let templates = [
|
||||
"hey",
|
||||
"ok",
|
||||
"got it",
|
||||
"sure",
|
||||
"sounds good",
|
||||
"thanks",
|
||||
"np",
|
||||
"see you there",
|
||||
"on my way",
|
||||
"running late",
|
||||
"be there soon",
|
||||
"👍",
|
||||
"✓",
|
||||
"meeting at the usual spot",
|
||||
"confirmed",
|
||||
"roger that"
|
||||
]
|
||||
|
||||
// Prefix with dummy marker (will be encrypted)
|
||||
return coverTrafficPrefix + (templates.randomElement() ?? "ok")
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user