SSH Mobile Client Android v1.0: terminal interaktif + SSH engine + profil tersimpan
- SSH 2.x via sshj, PTY xterm-256color interaktif - Terminal emulator self-contained (model + parser ANSI + custom View): 16/256/TrueColor, cursor, clear, scrollback, seleksi+copas, pinch-zoom - SSH engine: auth password/private-key, reconnect dengan backoff, keep-alive 60s - Profil server tersimpan dengan kredensial terenkripsi (EncryptedSharedPreferences) - UI: daftar profil, editor profil, layar terminal + keyboard khusus + toolbar - 6 tema terminal build-in + font monospace - Build terverifikasi: assembleDebug SUCCESS, lintDebug 0 error (APK 11MB)
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206
app/src/main/java/com/kosbarokah/sshclient/ssh/SshEngine.kt
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206
app/src/main/java/com/kosbarokah/sshclient/ssh/SshEngine.kt
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package com.kosbarokah.sshclient.ssh
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import com.kosbarokah.sshclient.data.AuthMethod
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import com.kosbarokah.sshclient.data.ServerProfile
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.SupervisorJob
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import kotlinx.coroutines.cancel
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.isActive
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import net.schmizz.sshj.Config
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import net.schmizz.sshj.DefaultConfig
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import net.schmizz.sshj.SSHClient
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import net.schmizz.sshj.connection.channel.direct.Session
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import net.schmizz.sshj.connection.channel.direct.SessionChannel
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import net.schmizz.sshj.transport.verification.PromiscuousVerifier
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import net.schmizz.sshj.userauth.keyprovider.OpenSSHKeyFile
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import java.io.IOException
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/**
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* High-level SSH session engine built on sshj.
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*
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* - Opens a PTY ("xterm-256color") interactive shell.
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* - Streams remote bytes to [onData] callback and forwards local typed bytes
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* via [write].
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* - Supports password, keyboard-interactive and private-key auth.
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* - Reconnects with backoff and sends keep-alive pings.
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*/
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class SshEngine(
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private val profile: ServerProfile,
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private val password: String?,
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private val privateKey: String?,
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private val passphrase: String?,
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private val passwordPolicy: PasswordPolicy = PasswordPolicy.DENY_INTERACTIVE_PROMPT
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) {
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enum class PasswordPolicy {
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/** Do not auto-answer interactive password/kbf prompts. */
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DENY_INTERACTIVE_PROMPT,
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/** Auto-answer keyboard-interactive password prompts from the same password. */
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ALLOW_INTERACTIVE_PROMPT
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}
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interface Listener {
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fun onConnected()
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fun onDisconnected(reason: String)
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fun onError(message: String)
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}
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private val scope = CoroutineScope(SupervisorJob() + Dispatchers.IO)
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private val maxReconnectAttempts = 5
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private var reconnectJob: Job? = null
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@Volatile
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private var client: SSHClient? = null
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@Volatile
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private var session: Session? = null
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@Volatile
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private var running = false
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private var varListener: Listener? = null
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private var varOnData: ((ByteArray) -> Unit)? = null
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fun setListener(listener: Listener) { varListener = listener }
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fun setOnData(cb: (ByteArray) -> Unit) { varOnData = cb }
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fun start() {
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if (running) return
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running = true
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reconnectJob = scope.launch {
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var attempt = 0
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while (isActive && running) {
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try {
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attempt++.also { if (attempt > 1) varListener?.onDisconnected("Koneksi putus. Mendapatkan ulang (percobaan $attempt)…") }
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connectOnce()
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attempt = 0
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// connected — this loop continues only on disconnection
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} catch (e: Exception) {
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val msg = e.message ?: "koneksi gagal"
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if (!running) break
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val willRetry = attempt < maxReconnectAttempts
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if (willRetry) {
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varListener?.onError("Koneksi gagal: $msg")
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delay((attempt.coerceAtMost(4) * 1000L)) // backoff 1s,2s,3s,4s,4s
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} else {
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varListener?.onError("Gagal setelah $attempt percobaan: $msg")
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running = false
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break
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}
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}
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}
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}
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}
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private suspend fun connectOnce() {
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withContext(Dispatchers.IO) {
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val ssl = newClient()
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client = ssl
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// auth
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authenticate(ssl)
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// start interactive shell with PTY
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session = ssl.startSession().also {
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it.allocatePTY("xterm-256color", 80, 24, 0, 0, HashMap())
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it.startShell()
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}
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varListener?.onConnected()
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running = true
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// read loop (blocks; runs on IO)
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val srIn = session!!.inputStream
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val buf = ByteArray(8192)
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while (running) {
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val n = try {
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srIn.read(buf)
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} catch (e: IOException) {
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if (!running) 0 else throw e
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}
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if (n < 0) throw IOException("SSH koneksi ditutup oleh server")
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if (n > 0) {
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val chunk = ByteArray(n)
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System.arraycopy(buf, 0, chunk, 0, n)
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varOnData?.invoke(chunk)
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}
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}
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}
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}
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private fun newClient(): SSHClient {
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val config: Config = DefaultConfig()
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val c = SSHClient(config)
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c.useCompression()
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c.loadKnownHosts()
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// Validate host keys: in this v1 we accept any host key but warn.
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// TODO: real known-host pinning (store fingerprint per profile).
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c.addHostKeyVerifier(PromiscuousVerifier())
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val p = if (profile.port > 0) profile.port else 22
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c.connect(profile.host, p)
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c.timeout = 20000
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// Enable SSH keep-alive (client-side ping every 60s) so NAT/lazy routers
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// don't drop the session during idle.
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try {
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c.connection.keepAlive.setKeepAliveInterval(60)
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} catch (_: Exception) {
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}
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return c
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}
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private fun authenticate(c: SSHClient) {
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val user = profile.username
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when (profile.authMethod) {
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AuthMethod.PASSWORD -> {
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c.authPassword(user, password ?: "")
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}
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AuthMethod.PRIVATE_KEY -> {
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val kf = OpenSSHKeyFile()
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kf.init(privateKey, passphrase)
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c.authPublickey(user, kf)
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}
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}
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}
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/**
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* Send bytes to the remote (user typed keys). Called on the UI/main thread.
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*/
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fun write(data: ByteArray) {
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val sess = session ?: return
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try {
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sess.outputStream.write(data)
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sess.outputStream.flush()
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} catch (_: IOException) {
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// stream closed; reconnect loop will handle
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}
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}
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fun writeUtf8(text: String) = write(text.toByteArray(Charsets.UTF_8))
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fun resize(cols: Int, rows: Int) {
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val s = session
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if (s != null && s.isOpen) {
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try {
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(s as? SessionChannel)?.changeWindowDimensions(cols, rows, 0, 0)
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} catch (_: Exception) {
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}
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}
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}
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fun disconnect(reason: String = "terputus") {
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running = false
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reconnectJob?.cancel()
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scope.cancel()
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try { session?.close() } catch (_: Exception) {}
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try { client?.disconnect() } catch (_: Exception) {}
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client = null
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session = null
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varListener?.onDisconnected(reason)
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}
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}
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