feat(app-glasses): авто-обнаружение телефона — mDNS-клиент + скан /24 (RayNeo mDNS мёртв)

- MdnsClient: свой mDNS (UDP 5353, PTR _viewmate._tcp, парсер со сжатием 0xC0), join на всех Wi-Fi-интерфейсах, MulticastLock - PhoneScan: план Б — TCP-скан своей /24 :8080 батчами, детект по WS-handshake (101), таймаут 5с - HostConnection: цепочка mDNS → scan /24 (пропуск на эмуляторе) → fallback 10.0.2.2 - app-phone: NsdPublisher (_viewmate._tcp, порт 8080) + NEARBY_WIFI_DEVICES - Тесты 27/0 glasses (MdnsClientTest, PhoneScanTest), 67/0 phone - Железо (RayNeo X2 + HONOR): mDNS multicast режется WiFi-стеком очков («ни одного пакета за 15с»), скан /24 нашёл телефон за 1.2с, ws://192.168.76.121:8080, hello→welcome, статусы идут
2026-08-19 20:06:27 +03:00
parent 35f462b34a
commit 698b6cf6dd
11 changed files with 880 additions and 32 deletions
@@ -0,0 +1,143 @@
+package pw.binom.viewmate.glasses
+
+import java.io.ByteArrayOutputStream
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNull
+
+class MdnsClientTest {
+
+    private val fallback = "ws://10.0.2.2:8080/ws/glasses"
+
+    @Test
+    fun mdnsHostWins() {
+        assertEquals(
+            "ws://192.168.76.7:8080/ws/glasses",
+            MdnsClient.resolvePhoneAddress("ws://192.168.76.7:8080/ws/glasses", fallback),
+            "mDNS нашёл телефон — используем его адрес",
+        )
+    }
+
+    @Test
+    fun nullHostFallsBack() {
+        assertEquals(fallback, MdnsClient.resolvePhoneAddress(null, fallback), "mDNS ничего не нашёл — fallback")
+    }
+
+    @Test
+    fun blankHostFallsBack() {
+        assertEquals(fallback, MdnsClient.resolvePhoneAddress("", fallback), "пустой адрес — fallback")
+        assertEquals(fallback, MdnsClient.resolvePhoneAddress("   ", fallback), "пробельный адрес — fallback")
+    }
+
+    @Test
+    fun emptyFallbackStaysEmpty() {
+        assertEquals("", MdnsClient.resolvePhoneAddress(null, ""), "пустой fallback не ломается")
+    }
+
+    @Test
+    fun emulatorTimeoutShort() {
+        assertEquals(3_000L, MdnsClient.mdnsTimeoutMs(isEmulator = true), "эмулятор: mDNS нет — быстрый fallback")
+    }
+
+    @Test
+    fun deviceTimeoutLong() {
+        assertEquals(15_000L, MdnsClient.mdnsTimeoutMs(isEmulator = false), "железо: mDNS RayNeo медленный — ждём 15с")
+    }
+
+    @Test
+    fun parsesPtrSrvA() {
+        // Синтетический mDNS-ответ: PTR + SRV + A → IP телефона.
+        assertEquals("192.168.76.121", MdnsClient.parseMdnsResponse(buildPtrSrvAPacket()))
+    }
+
+    @Test
+    fun acceptsAnswerInAdditionalSection() {
+        // A-запись в additional-секции (ARCOUNT) — так отвечают настоящие mDNS-ресолверы.
+        val packet = buildPtrSrvAPacket(ipInAdditional = true)
+        assertEquals("192.168.76.121", MdnsClient.parseMdnsResponse(packet))
+    }
+
+    @Test
+    fun garbageReturnsNull() {
+        assertNull(MdnsClient.parseMdnsResponse(ByteArray(0)), "пустой пакет — null")
+        assertNull(MdnsClient.parseMdnsResponse(byteArrayOf(1, 2, 3)), "короткий мусор — null")
+    }
+
+    @Test
+    fun foreignMulticastNoiseRejected() {
+        // Чужой сервис (не viewmate): A-запись есть, но PTR-имя другое.
+        val packet = buildForeignServicePacket()
+        assertNull(MdnsClient.parseMdnsResponse(packet), "чужой multicast-мусор — null")
+    }
+
+    private fun buildPtrSrvAPacket(ipInAdditional: Boolean = false): ByteArray {
+        val questionName = name("_viewmate", "_tcp", "local")
+        val question = questionName + u16(12) + u16(1)
+
+        val ptrRdata = name("viewmate", "_viewmate", "_tcp", "local")
+        val ptrAnswer = ptr(12) + u16(12) + u16(1) + u16ttl(120) + u16(ptrRdata.size) + ptrRdata
+
+        val ptrRdataOffset = 12 + question.size + ptrAnswer.size - ptrRdata.size
+        val targetName = name("honor", "local")
+        val srvRdata = u16(0) + u16(0) + u16(8080) + targetName
+        val srvAnswer = ptr(ptrRdataOffset) + u16(33) + u16(1) + u16ttl(120) + u16(srvRdata.size) + srvRdata
+
+        val srvRdataOffset = 12 + question.size + ptrAnswer.size + srvAnswer.size - srvRdata.size
+        val targetOffset = srvRdataOffset + 6
+        val aRecord = ptr(targetOffset) + u16(1) + u16(1) + u16ttl(120) + u16(4) + ip4(192, 168, 76, 121)
+
+        val ancount = if (ipInAdditional) 2 else 3
+        val arcount = if (ipInAdditional) 1 else 0
+        val header = u16(0) + u16(0x8400) + u16(1) + u16(ancount) + u16(0) + u16(arcount)
+        return header + question + ptrAnswer + srvAnswer + aRecord
+    }
+
+    private fun buildForeignServicePacket(): ByteArray {
+        val questionName = name("_googlecast", "_tcp", "local")
+        val question = questionName + u16(12) + u16(1)
+
+        val ptrRdata = name("chromecast", "_googlecast", "_tcp", "local")
+        val ptrAnswer = ptr(12) + u16(12) + u16(1) + u16ttl(120) + u16(ptrRdata.size) + ptrRdata
+
+        val ptrRdataOffset = 12 + question.size + ptrAnswer.size - ptrRdata.size
+        val targetName = name("kitchen", "local")
+        val srvRdata = u16(0) + u16(0) + u16(8009) + targetName
+        val srvAnswer = ptr(ptrRdataOffset) + u16(33) + u16(1) + u16ttl(120) + u16(srvRdata.size) + srvRdata
+
+        val srvRdataOffset = 12 + question.size + ptrAnswer.size + srvAnswer.size - srvRdata.size
+        val targetOffset = srvRdataOffset + 6
+        val aAnswer = ptr(targetOffset) + u16(1) + u16(1) + u16ttl(120) + u16(4) + ip4(192, 168, 1, 50)
+
+        val header = u16(0) + u16(0x8400) + u16(1) + u16(3) + u16(0) + u16(0)
+        return header + question + ptrAnswer + srvAnswer + aAnswer
+    }
+
+    private fun u16(v: Int): ByteArray =
+        byteArrayOf(((v shr 8) and 0xFF).toByte(), (v and 0xFF).toByte())
+
+    private fun ip4(a: Int, b: Int, c: Int, d: Int): ByteArray =
+        byteArrayOf(a.toByte(), b.toByte(), c.toByte(), d.toByte())
+
+    private fun u16ttl(v: Int): ByteArray =
+        byteArrayOf(0, 0, ((v shr 8) and 0xFF).toByte(), (v and 0xFF).toByte())
+
+    private fun label(s: String): ByteArray =
+        byteArrayOf(s.length.toByte()) + s.toByteArray(Charsets.US_ASCII)
+
+    private fun name(vararg labels: String): ByteArray {
+        val out = ByteArrayOutputStream()
+        for (l in labels) out.write(label(l))
+        out.write(0)
+        return out.toByteArray()
+    }
+
+    private fun ptr(offset: Int): ByteArray =
+        byteArrayOf((0xC0 or ((offset shr 8) and 0x3F)).toByte(), (offset and 0xFF).toByte())
+
+    private operator fun ByteArray.plus(other: ByteArray): ByteArray {
+        val out = ByteArray(size + other.size)
+        System.arraycopy(this, 0, out, 0, size)
+        System.arraycopy(other, 0, out, size, other.size)
+        return out
+    }
+}
@@ -0,0 +1,27 @@
+package pw.binom.viewmate.glasses
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class PhoneScanTest {
+
+    @Test
+    fun subnetRangeBuildsDot24() {
+        val range = PhoneScan.subnetRange("192.168.76.152")
+        assertEquals(254, range.size, "в /24 — 254 хоста")
+        assertEquals("192.168.76.1", range.first(), "сеть начинается с .1")
+        assertEquals("192.168.76.254", range.last(), "сеть заканчивается на .254")
+        assertEquals("192.168.76.121", range[120], "телефон (в задаче 192.168.76.121) внутри подсети")
+        assertTrue(range.none { it.endsWith(".0") || it.endsWith(".255") }, "без сетевого и бродкаст-адреса")
+    }
+
+    @Test
+    fun subnetRangeRejectsInvalid() {
+        assertTrue(PhoneScan.subnetRange("").isEmpty(), "пустая строка")
+        assertTrue(PhoneScan.subnetRange("не-адрес").isEmpty(), "не адрес")
+        assertTrue(PhoneScan.subnetRange("192.168.76").isEmpty(), "мало октетов")
+        assertTrue(PhoneScan.subnetRange("256.1.1.1").isEmpty(), "октет вне 0..255")
+        assertTrue(PhoneScan.subnetRange("192.168.76.152.5").isEmpty(), "много октетов")
+    }
+}