android: server page as in the Final 2026 mockup; profile source, link updates with a diff sheet and a daily check, per-profile IKE fragmentation

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/frontends/android/app/src/main/AndroidManifest.xml

@@ -79,6 +79,9 @@
                 <action android:name="android.service.quicksettings.action.QS_TILE_PREFERENCES" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ui.ServerActivity"
+            android:exported="false" />
         <activity
             android:name=".ui.StatsActivity"
             android:exported="false" />

src/frontends/android/app/src/main/java/org/strongswan/android/logic/CharonVpnService.java

@@ -561,6 +561,7 @@ public class CharonVpnService extends VpnService implements Runnable, VpnStateSe
 							writer.setValue("connection.local_id", mCurrentProfile.getLocalId());
 							writer.setValue("connection.remote_id", mCurrentProfile.getRemoteId());
 							writer.setValue("connection.certreq", (mCurrentProfile.getFlags() & VpnProfile.FLAGS_SUPPRESS_CERT_REQS) == 0);
+							writer.setValue("connection.fragmentation", org.strongswan.android.logic.profiles.ProfileExtras.get(CharonVpnService.this, mCurrentProfile.getUUID().toString()).getIkeFragmentation());
 							writer.setValue("connection.strict_revocation", (mCurrentProfile.getFlags() & VpnProfile.FLAGS_STRICT_REVOCATION) != 0);
 							writer.setValue("connection.ike_proposal", mCurrentProfile.getIkeProposal());
 							writer.setValue("connection.esp_proposal", mCurrentProfile.getEspProposal());

src/frontends/android/app/src/main/java/org/strongswan/android/logic/StrongSwanApplication.java

@@ -139,6 +139,8 @@ public class StrongSwanApplication extends Application
 
 		/* checks the update storage for a newer version of the app (if enabled and due) */
 		UpdateManager.getInstance(this).start();
+		/* daily re-read of the profiles that came from a link */
+		org.strongswan.android.logic.profiles.ProfileUpdater.schedule(this);
 	}
 
 	private void reloadManagedConfigurationAndNotifyListeners()

src/frontends/android/app/src/main/java/org/strongswan/android/logic/events/EventLog.kt

@@ -66,6 +66,8 @@ enum class EventAction
 	INSTALL_UPDATE,
 	/** let the app in [ShxEvent.target] bypass the VPN */
 	SET_APP_DIRECT,
+	/** show the link update of the profile [ShxEvent.target] (F_ProfileUpdate) */
+	PROFILE_UPDATE,
 }
 
 data class ShxEvent(

src/frontends/android/app/src/main/java/org/strongswan/android/logic/profiles/ProfileExtras.kt

@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic.profiles
+
+import android.content.Context
+import android.util.Log
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.update
+import org.json.JSONArray
+import org.json.JSONObject
+import java.io.File
+
+/** Where a profile came from (F_Profile «Profile source»). */
+enum class ProfileSourceType { LINK, FILE, QR, MANUAL, UNKNOWN }
+
+/**
+ * What the app keeps about a profile besides the strongSwan profile itself:
+ * its source (and the update link), and the resilience settings of F_Profile.
+ */
+data class ProfileExtra(
+	val uuid: String,
+	val source: ProfileSourceType = ProfileSourceType.UNKNOWN,
+	/** https link for LINK, the file name for FILE */
+	val sourceValue: String? = null,
+	val addedAt: Long = 0L,
+	val autoUpdate: Boolean = true,
+	val checkedAt: Long = 0L,
+	/** number of changes found by the last check, -1 when it failed */
+	val lastChanges: Int = 0,
+	/** ports tried in turn when the main one does not answer */
+	val backupPorts: List<Int> = emptyList(),
+	/** profile used when this one does not connect in [RESERVE_TIMEOUT_S] */
+	val reserveUuid: String? = null,
+	/** profile switched to while the operator whitelists are on */
+	val bridgeUuid: String? = null,
+	val bridgeEnabled: Boolean = false,
+	/** IKE fragmentation (charon «fragmentation = yes»), on unless switched off */
+	val ikeFragmentation: Boolean = true,
+)
+
+const val RESERVE_TIMEOUT_S = 15
+
+/** Store of [ProfileExtra] (profile_extras.json), observable. */
+object ProfileExtras
+{
+	private const val TAG = "ProfileExtras"
+	private const val FILE_NAME = "profile_extras.json"
+
+	private val _all = MutableStateFlow<Map<String, ProfileExtra>>(emptyMap())
+	val all: StateFlow<Map<String, ProfileExtra>> = _all
+	@Volatile private var loaded = false
+
+	@JvmStatic
+	fun get(context: Context, uuid: String): ProfileExtra
+	{
+		load(context)
+		return _all.value[uuid] ?: ProfileExtra(uuid)
+	}
+
+	fun flow(context: Context): StateFlow<Map<String, ProfileExtra>>
+	{
+		load(context)
+		return all
+	}
+
+	@JvmStatic
+	fun update(context: Context, uuid: String, transform: (ProfileExtra) -> ProfileExtra)
+	{
+		load(context)
+		_all.update { it + (uuid to transform(it[uuid] ?: ProfileExtra(uuid))) }
+		save(context)
+	}
+
+	/**
+	 * A profile was imported: remember where from.  A re-import from the
+	 * same kind of source keeps the user's settings (auto update, resilience).
+	 */
+	@JvmStatic
+	fun recordImport(context: Context, uuid: String, scheme: String?, uri: String?, qr: Boolean)
+	{
+		val type = when
+		{
+			qr -> ProfileSourceType.QR
+			scheme == "http" || scheme == "https" -> ProfileSourceType.LINK
+			else -> ProfileSourceType.FILE
+		}
+		val value = when (type)
+		{
+			ProfileSourceType.LINK -> uri
+			ProfileSourceType.FILE -> uri?.substringAfterLast('/')?.substringAfterLast("%2F")?.takeIf { it.isNotBlank() }
+			else -> null
+		}
+		update(context, uuid) {
+			/* a link stays the update source even when the new copy came from a file */
+			if (it.source == ProfileSourceType.LINK && type != ProfileSourceType.LINK) it.copy(addedAt = System.currentTimeMillis())
+			else it.copy(source = type, sourceValue = value, addedAt = System.currentTimeMillis(), checkedAt = if (type == ProfileSourceType.LINK) System.currentTimeMillis() else it.checkedAt, lastChanges = 0)
+		}
+	}
+
+	/** A profile created by hand (when nothing is recorded for it yet). */
+	@JvmStatic
+	fun recordManual(context: Context, uuid: String)
+	{
+		load(context)
+		if (_all.value[uuid]?.source.let { it == null || it == ProfileSourceType.UNKNOWN })
+		{
+			update(context, uuid) { it.copy(source = ProfileSourceType.MANUAL, addedAt = System.currentTimeMillis()) }
+		}
+	}
+
+	@JvmStatic
+	fun remove(context: Context, uuid: String)
+	{
+		load(context)
+		_all.update { it - uuid }
+		save(context)
+	}
+
+	private fun load(context: Context)
+	{
+		if (loaded)
+		{
+			return
+		}
+		synchronized(this)
+		{
+			if (loaded)
+			{
+				return
+			}
+			try
+			{
+				val file = File(context.filesDir, FILE_NAME)
+				if (file.exists())
+				{
+					val array = JSONArray(file.readText())
+					_all.value = (0 until array.length()).map { fromJson(array.getJSONObject(it)) }.associateBy { it.uuid }
+				}
+			}
+			catch (e: Exception)
+			{
+				Log.w(TAG, "Loading failed", e)
+			}
+			loaded = true
+		}
+	}
+
+	private fun save(context: Context)
+	{
+		try
+		{
+			val array = JSONArray()
+			_all.value.values.forEach { array.put(toJson(it)) }
+			val file = File(context.filesDir, FILE_NAME)
+			val tmp = File(file.path + ".tmp")
+			tmp.writeText(array.toString())
+			if (!tmp.renameTo(file))
+			{
+				file.writeText(array.toString())
+				tmp.delete()
+			}
+		}
+		catch (e: Exception)
+		{
+			Log.w(TAG, "Saving failed", e)
+		}
+	}
+
+	internal fun toJson(e: ProfileExtra): JSONObject = JSONObject()
+		.put("uuid", e.uuid).put("source", e.source.name).put("value", e.sourceValue ?: JSONObject.NULL)
+		.put("added", e.addedAt).put("auto", e.autoUpdate).put("checked", e.checkedAt).put("changes", e.lastChanges)
+		.put("ports", JSONArray(e.backupPorts)).put("reserve", e.reserveUuid ?: JSONObject.NULL)
+		.put("bridge", e.bridgeUuid ?: JSONObject.NULL).put("bridgeOn", e.bridgeEnabled).put("frag", e.ikeFragmentation)
+
+	internal fun fromJson(o: JSONObject): ProfileExtra
+	{
+		val ports = o.optJSONArray("ports")
+		return ProfileExtra(
+			uuid = o.getString("uuid"),
+			source = runCatching { ProfileSourceType.valueOf(o.optString("source")) }.getOrDefault(ProfileSourceType.UNKNOWN),
+			sourceValue = o.optString("value").takeIf { !o.isNull("value") && it.isNotEmpty() },
+			addedAt = o.optLong("added"),
+			autoUpdate = o.optBoolean("auto", true),
+			checkedAt = o.optLong("checked"),
+			lastChanges = o.optInt("changes"),
+			backupPorts = if (ports == null) emptyList() else (0 until ports.length()).map { ports.getInt(it) },
+			reserveUuid = o.optString("reserve").takeIf { !o.isNull("reserve") && it.isNotEmpty() },
+			bridgeUuid = o.optString("bridge").takeIf { !o.isNull("bridge") && it.isNotEmpty() },
+			bridgeEnabled = o.optBoolean("bridgeOn"),
+			ikeFragmentation = o.optBoolean("frag", true),
+		)
+	}
+}

src/frontends/android/app/src/main/java/org/strongswan/android/logic/profiles/ProfileUpdater.kt

@@ -0,0 +1,292 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+package org.strongswan.android.logic.profiles
+
+import android.content.Context
+import android.content.Intent
+import android.util.Base64
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import androidx.work.Constraints
+import androidx.work.CoroutineWorker
+import androidx.work.ExistingPeriodicWorkPolicy
+import androidx.work.NetworkType
+import androidx.work.PeriodicWorkRequestBuilder
+import androidx.work.WorkManager
+import androidx.work.WorkerParameters
+import org.json.JSONObject
+import org.strongswan.android.R
+import org.strongswan.android.data.VpnProfile
+import org.strongswan.android.data.VpnProfileSource
+import org.strongswan.android.logic.DiagLog
+import org.strongswan.android.logic.TrustedCertificateManager
+import org.strongswan.android.logic.VpnStateService
+import org.strongswan.android.logic.events.EventAction
+import org.strongswan.android.logic.events.EventCategory
+import org.strongswan.android.logic.events.EventKind
+import org.strongswan.android.logic.events.EventLog
+import org.strongswan.android.utils.Constants
+import java.io.ByteArrayInputStream
+import java.net.HttpURLConnection
+import java.net.URL
+import java.security.KeyStore
+import java.security.cert.CertificateFactory
+import java.security.cert.X509Certificate
+import java.text.SimpleDateFormat
+import java.util.Locale
+import java.util.UUID
+import java.util.concurrent.TimeUnit
+
+/** One changed field (F_ProfileUpdate): label, old and new value as shown. */
+data class ProfileChange(val label: String, val old: String, val new: String)
+
+/** The server's copy of a profile and how it differs from the local one. */
+class ProfileCheck(
+	val uuid: String,
+	val changes: List<ProfileChange>,
+	internal val gateway: String,
+	internal val port: Int?,
+	internal val remoteId: String?,
+	internal val certificate: X509Certificate?,
+)
+
+internal enum class ProfileField { ADDRESS, PORT, REMOTE_ID, CA }
+
+/** A raw difference: CA values are the expiry dates. */
+internal data class FieldChange(val field: ProfileField, val old: Any?, val new: Any?)
+
+/** The server-side fields of a downloaded .sswan. */
+internal data class RemoteProfile(val gateway: String, val port: Int?, val remoteId: String?, val certificate: X509Certificate?)
+
+internal fun parseRemote(text: String, decode: (String) -> ByteArray): RemoteProfile
+{
+	val remote = JSONObject(text).getJSONObject("remote")
+	return RemoteProfile(
+		gateway = remote.getString("addr"),
+		port = remote.optInt("port").takeIf { it in 1..65535 },
+		remoteId = remote.optString("id").ifEmpty { null },
+		certificate = remote.optString("cert").ifEmpty { null }?.let {
+			CertificateFactory.getInstance("X.509").generateCertificate(ByteArrayInputStream(decode(it))) as X509Certificate
+		},
+	)
+}
+
+/** What changes when the local profile takes the [remote] fields (port 4500 when unset). */
+internal fun diff(gateway: String?, port: Int?, remoteId: String?, currentCa: X509Certificate?, remote: RemoteProfile): List<FieldChange>
+{
+	val changes = ArrayList<FieldChange>()
+	if (remote.gateway != gateway)
+	{
+		changes += FieldChange(ProfileField.ADDRESS, gateway, remote.gateway)
+	}
+	if ((remote.port ?: 4500) != (port ?: 4500))
+	{
+		changes += FieldChange(ProfileField.PORT, port ?: 4500, remote.port ?: 4500)
+	}
+	if (remote.remoteId != null && remote.remoteId != remoteId)
+	{
+		changes += FieldChange(ProfileField.REMOTE_ID, remoteId ?: gateway, remote.remoteId)
+	}
+	val cert = remote.certificate
+	if (cert != null && (currentCa == null || !currentCa.encoded.contentEquals(cert.encoded)))
+	{
+		changes += FieldChange(ProfileField.CA, currentCa?.notAfter, cert.notAfter)
+	}
+	return changes
+}
+
+/**
+ * Re-reads a profile from its link (F_Profile «Check now», the daily
+ * check) and applies the server-side fields: address, port, remote
+ * identity and CA certificate.  The login, DNS, resilience settings,
+ * routing rules and apps stay as they are.
+ */
+object ProfileUpdater
+{
+	private const val TAG = "ProfileUpdater"
+	private const val WORK_NAME = "profile-update-check"
+
+	/** Downloads and compares; throws on network or format errors. */
+	@JvmStatic
+	fun check(context: Context, uuid: String): ProfileCheck
+	{
+		val extra = ProfileExtras.get(context, uuid)
+		val link = extra.sourceValue?.takeIf { extra.source == ProfileSourceType.LINK } ?: throw IllegalStateException("no link")
+		val profile = loadProfile(context, uuid) ?: throw IllegalStateException("no profile")
+		val text = download(link)
+		val remote = parseRemote(text) { Base64.decode(it, Base64.DEFAULT) }
+		val currentCa = profile.certificateAlias?.let { TrustedCertificateManager.getInstance().load().getCACertificateFromAlias(it) }
+		val until = SimpleDateFormat("MM.yyyy", Locale.getDefault())
+		val changes = diff(profile.gateway, profile.port, profile.remoteId, currentCa, remote).map {
+			val label = context.getString(
+				when (it.field)
+				{
+					ProfileField.ADDRESS -> R.string.profile_update_addr
+					ProfileField.PORT -> R.string.profile_update_port
+					ProfileField.REMOTE_ID -> R.string.profile_update_id
+					ProfileField.CA -> R.string.profile_update_ca
+				}
+			)
+			fun show(value: Any?): String = when (value)
+			{
+				null -> "—"
+				is java.util.Date -> context.getString(R.string.profile_update_until, until.format(value))
+				else -> value.toString()
+			}
+			ProfileChange(label, show(it.old), show(it.new))
+		}
+		val gateway = remote.gateway
+		val port = remote.port
+		val remoteId = remote.remoteId
+		val certificate = remote.certificate
+		ProfileExtras.update(context, uuid) { it.copy(checkedAt = System.currentTimeMillis(), lastChanges = changes.size) }
+		return ProfileCheck(uuid, changes, gateway, port, remoteId, certificate)
+	}
+
+	/** Writes the server-side fields and reconnects when the profile is in use. */
+	@JvmStatic
+	fun apply(context: Context, check: ProfileCheck)
+	{
+		val source = VpnProfileSource(context)
+		source.open()
+		try
+		{
+			val profile = source.getVpnProfile(UUID.fromString(check.uuid)) ?: return
+			profile.gateway = check.gateway
+			profile.port = check.port
+			if (check.remoteId != null)
+			{
+				profile.remoteId = check.remoteId
+			}
+			check.certificate?.let { cert ->
+				val store = KeyStore.getInstance("LocalCertificateStore")
+				store.load(null, null)
+				store.setCertificateEntry(null, cert)
+				profile.certificateAlias = store.getCertificateAlias(cert)
+				TrustedCertificateManager.getInstance().reset()
+			}
+			source.updateVpnProfile(profile)
+		}
+		finally
+		{
+			source.close()
+		}
+		ProfileExtras.update(context, check.uuid) { it.copy(lastChanges = 0) }
+		val intent = Intent(Constants.VPN_PROFILES_CHANGED).putExtra(Constants.VPN_PROFILES_SINGLE, check.uuid)
+		LocalBroadcastManager.getInstance(context).sendBroadcast(intent)
+		EventLog.getInstance(context).resolve("profile-update:${check.uuid}")
+		DiagLog.i(TAG, "profile ${check.uuid} updated from its link (${check.changes.size} changes)")
+		/* the running tunnel still uses the old settings */
+		val service = VpnStateService.getLiveInstance()
+		if (service != null && service.profile?.getUUID()?.toString() == check.uuid && service.state != VpnStateService.State.DISABLED)
+		{
+			service.reconnect()
+		}
+	}
+
+	private fun loadProfile(context: Context, uuid: String): VpnProfile?
+	{
+		val source = VpnProfileSource(context)
+		source.open()
+		try
+		{
+			return source.getVpnProfile(UUID.fromString(uuid))
+		}
+		finally
+		{
+			source.close()
+		}
+	}
+
+	private fun download(link: String): String
+	{
+		val connection = URL(link).openConnection() as HttpURLConnection
+		connection.connectTimeout = 15_000
+		connection.readTimeout = 15_000
+		try
+		{
+			if (connection.responseCode !in 200..299)
+			{
+				throw IllegalStateException("HTTP ${connection.responseCode}")
+			}
+			/* a profile is a few KiB; anything huge is not one */
+			return connection.inputStream.use { String(it.readNBytesCompat(512 * 1024), Charsets.UTF_8) }
+		}
+		finally
+		{
+			connection.disconnect()
+		}
+	}
+
+	private fun java.io.InputStream.readNBytesCompat(max: Int): ByteArray
+	{
+		val out = java.io.ByteArrayOutputStream()
+		val buffer = ByteArray(8192)
+		while (out.size() < max)
+		{
+			val n = read(buffer)
+			if (n < 0)
+			{
+				break
+			}
+			out.write(buffer, 0, n)
+		}
+		return out.toByteArray()
+	}
+
+	/** Daily check of the profiles with a link and «Update automatically» on. */
+	@JvmStatic
+	fun schedule(context: Context)
+	{
+		val request = PeriodicWorkRequestBuilder<ProfileUpdateWorker>(24, TimeUnit.HOURS)
+			.setConstraints(Constraints.Builder().setRequiredNetworkType(NetworkType.CONNECTED).build())
+			.build()
+		WorkManager.getInstance(context).enqueueUniquePeriodicWork(WORK_NAME, ExistingPeriodicWorkPolicy.KEEP, request)
+	}
+
+	internal fun checkAll(context: Context)
+	{
+		val due = ProfileExtras.flow(context).value.values.filter { it.source == ProfileSourceType.LINK && it.autoUpdate }
+		for (extra in due)
+		{
+			try
+			{
+				val check = check(context, extra.uuid)
+				if (check.changes.isNotEmpty())
+				{
+					val name = loadProfile(context, extra.uuid)?.name ?: extra.uuid
+					EventLog.getInstance(context).recordOnce(
+						EventKind.ASK, EventCategory.CONNECTION, context.getString(R.string.event_profile_update_title, name),
+						context.getString(R.string.event_profile_update_text, check.changes.size), EventAction.PROFILE_UPDATE,
+						"profile-update:${extra.uuid}", extra.uuid,
+					)
+				}
+			}
+			catch (e: Exception)
+			{
+				ProfileExtras.update(context, extra.uuid) { it.copy(checkedAt = System.currentTimeMillis(), lastChanges = -1) }
+				DiagLog.i(TAG, "profile check failed: $e")
+			}
+		}
+	}
+}
+
+class ProfileUpdateWorker(context: Context, params: WorkerParameters) : CoroutineWorker(context, params)
+{
+	override suspend fun doWork(): Result
+	{
+		ProfileUpdater.checkAll(applicationContext)
+		return Result.success()
+	}
+}

src/frontends/android/app/src/main/java/org/strongswan/android/ui/InboxActivity.kt

@@ -67,6 +67,7 @@ class InboxActivity : AppCompatActivity()
 			EventAction.OPEN_ROUTING -> startActivity(main.putExtra(MainActivity.EXTRA_OPEN_ROUTING, true))
 			EventAction.INSTALL_UPDATE -> startActivity(main.putExtra(MainActivity.EXTRA_INSTALL_UPDATE, true))
 			EventAction.OPEN_ROUTE_CHECK -> startActivity(Intent(this, RouteCheckActivity::class.java))
+			EventAction.PROFILE_UPDATE -> event.target?.let { startActivity(ServerActivity.intent(this, it, checkUpdate = true)) }
 			EventAction.OPEN_LOG -> startActivity(Intent(this, LogActivity::class.java))
 		}
 		if (action == EventAction.OPEN_HOME || action == EventAction.OPEN_ROUTING || action == EventAction.INSTALL_UPDATE)

src/frontends/android/app/src/main/java/org/strongswan/android/ui/ServerActivity.kt

@@ -0,0 +1,781 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+package org.strongswan.android.ui
+
+import android.content.ActivityNotFoundException
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.text.format.DateUtils
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+import androidx.appcompat.app.AppCompatActivity
+import androidx.compose.foundation.background
+import androidx.compose.foundation.border
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.navigationBarsPadding
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.statusBarsPadding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.Icon
+import androidx.compose.material3.SnackbarHostState
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.produceState
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.Role
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.text.style.TextDecoration
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.compose.LocalLifecycleOwner
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.localbroadcastmanager.content.LocalBroadcastManager
+import com.journeyapps.barcodescanner.ScanContract
+import com.journeyapps.barcodescanner.ScanOptions
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import org.strongswan.android.R
+import org.strongswan.android.data.VpnProfile
+import org.strongswan.android.data.VpnProfileDataSource
+import org.strongswan.android.data.VpnProfileSource
+import org.strongswan.android.data.VpnType
+import org.strongswan.android.logic.VpnStateService
+import org.strongswan.android.logic.connectivity.ConnectivityProbe
+import org.strongswan.android.logic.profiles.ProfileCheck
+import org.strongswan.android.logic.profiles.ProfileExtra
+import org.strongswan.android.logic.profiles.ProfileExtras
+import org.strongswan.android.logic.profiles.ProfileSourceType
+import org.strongswan.android.logic.profiles.ProfileUpdater
+import org.strongswan.android.logic.profiles.RESERVE_TIMEOUT_S
+import org.strongswan.android.ui.compose.ProfileQr
+import org.strongswan.android.ui.compose.ShareProfileScreen
+import org.strongswan.android.ui.compose.components.ShxSnackbarHost
+import org.strongswan.android.ui.compose.design.ShxAlertDialog
+import org.strongswan.android.ui.compose.design.ShxButton
+import org.strongswan.android.ui.compose.design.ShxButtonStyle
+import org.strongswan.android.ui.compose.design.ShxDialog
+import org.strongswan.android.ui.compose.design.ShxFormField
+import org.strongswan.android.ui.compose.design.ShxIcons
+import org.strongswan.android.ui.compose.design.ShxPanel
+import org.strongswan.android.ui.compose.design.ShxSectionHeader
+import org.strongswan.android.ui.compose.design.ShxSheet
+import org.strongswan.android.ui.compose.design.ShxSheetTitle
+import org.strongswan.android.ui.compose.design.ShxSwitch
+import org.strongswan.android.ui.compose.home.serverCode
+import org.strongswan.android.ui.compose.theme.LocalShxColors
+import org.strongswan.android.ui.compose.theme.ShxTheme
+import org.strongswan.android.ui.compose.theme.ShxType
+import org.strongswan.android.utils.Constants
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import java.util.UUID
+
+/** One server (F_Profile): source and updates, server, resilience and network settings. */
+class ServerActivity : AppCompatActivity()
+{
+	override fun onCreate(savedInstanceState: Bundle?)
+	{
+		super.onCreate(savedInstanceState)
+		enableEdgeToEdge()
+		val uuid = intent.getStringExtra(VpnProfileDataSource.KEY_UUID)
+		if (uuid == null)
+		{
+			finish()
+			return
+		}
+		val checkNow = intent.getBooleanExtra(EXTRA_CHECK_UPDATE, false)
+		setContent {
+			ShxTheme {
+				ServerScreen(uuid, checkNow, onBack = { finish() })
+			}
+		}
+	}
+
+	companion object
+	{
+		private const val EXTRA_CHECK_UPDATE = "org.strongswan.android.extra.CHECK_UPDATE"
+
+		@JvmStatic
+		@JvmOverloads
+		fun intent(context: Context, uuid: String, checkUpdate: Boolean = false): Intent =
+			Intent(context, ServerActivity::class.java)
+				.putExtra(VpnProfileDataSource.KEY_UUID, uuid)
+				.putExtra(EXTRA_CHECK_UPDATE, checkUpdate)
+	}
+}
+
+private fun loadProfiles(context: Context): List<VpnProfile>
+{
+	val source = VpnProfileSource(context)
+	source.open()
+	try
+	{
+		return source.allVpnProfiles
+	}
+	finally
+	{
+		source.close()
+	}
+}
+
+/* which picker sheet is open */
+private enum class Picker { RESERVE, BRIDGE }
+
+@Composable
+private fun ServerScreen(uuid: String, checkOnOpen: Boolean, onBack: () -> Unit)
+{
+	val c = LocalShxColors.current
+	val context = LocalContext.current
+	val scope = rememberCoroutineScope()
+	val snackbar = remember { SnackbarHostState() }
+	var reloads by remember { mutableIntStateOf(0) }
+	val owner = LocalLifecycleOwner.current
+	DisposableEffect(owner) {
+		val observer = LifecycleEventObserver { _, event -> if (event == Lifecycle.Event.ON_RESUME) reloads++ }
+		owner.lifecycle.addObserver(observer)
+		onDispose { owner.lifecycle.removeObserver(observer) }
+	}
+	val profiles by produceState<List<VpnProfile>?>(null, reloads) { value = withContext(Dispatchers.IO) { loadProfiles(context) } }
+	val all = profiles ?: return
+	val profile = all.firstOrNull { it.getUUID().toString() == uuid }
+	if (profile == null)
+	{
+		LaunchedEffect(Unit) { onBack() }
+		return
+	}
+	val extras by remember { ProfileExtras.flow(context) }.collectAsStateWithLifecycle()
+	val extra = extras[uuid] ?: ProfileExtra(uuid)
+	/* the live state of the tunnel and a direct ping of the server */
+	val vpn by produceState<Pair<VpnStateService.State, String?>?>(null) {
+		while (true)
+		{
+			val service = VpnStateService.getLiveInstance()
+			value = service?.let { it.state to it.profile?.getUUID()?.toString() }
+			delay(1500)
+		}
+	}
+	val rtt by produceState<Long?>(null, profile.gateway) {
+		while (true)
+		{
+			value = withContext(Dispatchers.IO) { ConnectivityProbe.pingServerDirect(context, profile.gateway, 1500)?.first }
+			delay(30_000)
+		}
+	}
+	val active = vpn?.second == uuid
+	val connected = active && vpn?.first == VpnStateService.State.CONNECTED
+
+	var checking by remember { mutableStateOf(false) }
+	var check by remember { mutableStateOf<ProfileCheck?>(null) }
+	var showShare by remember { mutableStateOf(false) }
+	var showDelete by remember { mutableStateOf(false) }
+	var showLink by remember { mutableStateOf(false) }
+	var showPorts by remember { mutableStateOf(false) }
+	var picker by remember { mutableStateOf<Picker?>(null) }
+	val noChanges = stringResource(R.string.profile_check_none)
+	val failed = stringResource(R.string.profile_check_failed)
+	val updated = stringResource(R.string.profile_updated)
+
+	fun runCheck()
+	{
+		if (checking) return
+		checking = true
+		scope.launch {
+			val result = withContext(Dispatchers.IO) { runCatching { ProfileUpdater.check(context, uuid) } }
+			checking = false
+			result.onSuccess { if (it.changes.isEmpty()) snackbar.showSnackbar(noChanges) else check = it }
+			result.onFailure {
+				ProfileExtras.update(context, uuid) { e -> e.copy(checkedAt = System.currentTimeMillis(), lastChanges = -1) }
+				snackbar.showSnackbar(failed)
+			}
+		}
+	}
+	LaunchedEffect(checkOnOpen) { if (checkOnOpen && extra.source == ProfileSourceType.LINK) runCheck() }
+
+	fun edit() = context.startActivity(Intent(context, VpnProfileDetailActivity::class.java).putExtra(VpnProfileDataSource.KEY_UUID, uuid))
+	fun export() = scope.launch {
+		val file = withContext(Dispatchers.IO) { org.strongswan.android.logic.VpnProfileExporter.exportProfile(context, profile, false) }
+		if (file == null)
+		{
+			snackbar.showSnackbar(context.getString(R.string.share_profile_failed))
+			return@launch
+		}
+		val send = Intent(Intent.ACTION_SEND).setType(org.strongswan.android.data.ProfileExportProvider.MIME_TYPE).putExtra(Intent.EXTRA_STREAM, file)
+		try
+		{
+			context.startActivity(Intent.createChooser(send, context.getString(R.string.share_profile)))
+		}
+		catch (_: ActivityNotFoundException)
+		{
+			snackbar.showSnackbar(context.getString(R.string.share_profile_failed))
+		}
+	}
+	val scanner = rememberLauncherForActivityResult(ScanContract()) { result ->
+		result.contents?.let { text -> ProfileQr.importIntent(context, text)?.let { context.startActivity(it) } }
+	}
+
+	Box(Modifier.fillMaxSize().background(c.background))
+	{
+		Column(
+			verticalArrangement = Arrangement.spacedBy(12.dp),
+			modifier = Modifier.fillMaxSize().statusBarsPadding().verticalScroll(rememberScrollState()).navigationBarsPadding()
+				.padding(bottom = 24.dp),
+		)
+		{
+			/* header: back, «Share» pill */
+			Row(verticalAlignment = Alignment.CenterVertically, modifier = Modifier.fillMaxWidth().padding(start = 12.dp, end = 12.dp, top = 16.dp, bottom = 8.dp))
+			{
+				Box(contentAlignment = Alignment.Center, modifier = Modifier.size(44.dp).clip(CircleShape).clickable(role = Role.Button, onClick = onBack))
+				{
+					Icon(ShxIcons.Back, contentDescription = stringResource(R.string.back), tint = c.text, modifier = Modifier.size(22.dp))
+				}
+				Spacer(Modifier.weight(1f))
+				Row(
+					verticalAlignment = Alignment.CenterVertically,
+					horizontalArrangement = Arrangement.spacedBy(8.dp),
+					modifier = Modifier.height(40.dp).clip(RoundedCornerShape(20.dp)).background(c.accentContainer)
+						.clickable(role = Role.Button) { showShare = true }.padding(horizontal = 14.dp),
+				)
+				{
+					Icon(ShxIcons.Scan, contentDescription = null, tint = c.onAccentContainer, modifier = Modifier.size(18.dp))
+					Text(stringResource(R.string.server_share), style = ShxType.chip.copy(fontWeight = FontWeight.ExtraBold), color = c.onAccentContainer)
+				}
+			}
+			Column(Modifier.padding(horizontal = 16.dp), verticalArrangement = Arrangement.spacedBy(12.dp))
+			{
+				/* who: avatar, name, state */
+				Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(14.dp), modifier = Modifier.padding(start = 4.dp, end = 4.dp, bottom = 6.dp))
+				{
+					Box(contentAlignment = Alignment.Center, modifier = Modifier.size(56.dp).clip(CircleShape).background(c.accent))
+					{
+						Text(serverCode(profile, null), style = ShxType.cardHeading.copy(fontSize = 18.sp), color = Color.White)
+					}
+					Column(verticalArrangement = Arrangement.spacedBy(3.dp))
+					{
+						Text(profile.name ?: profile.gateway, style = ShxType.screenTitle, color = c.text)
+						val (dot, textColor, label) = when
+						{
+							connected -> Triple(c.success, c.onSuccess, rtt?.let { stringResource(R.string.server_state_connected_ms, it.toInt()) } ?: stringResource(R.string.server_state_connected))
+							active && vpn?.first == VpnStateService.State.CONNECTING -> Triple(c.accent, c.accentText, stringResource(R.string.server_state_connecting))
+							rtt != null -> Triple(c.textSub, c.textSub, stringResource(R.string.server_state_answers, rtt!!.toInt()))
+							else -> Triple(c.warning, c.onWarningContainer, stringResource(R.string.server_state_no_answer))
+						}
+						Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(6.dp))
+						{
+							Box(Modifier.size(8.dp).clip(CircleShape).background(dot))
+							Text(label, style = ShxType.chip, color = textColor)
+						}
+					}
+				}
+
+				SourceSection(
+					extra = extra,
+					checking = checking,
+					onEditLink = { showLink = true },
+					onAuto = { on -> ProfileExtras.update(context, uuid) { it.copy(autoUpdate = on) } },
+					onCheck = ::runCheck,
+					onFile = { context.startActivity(Intent(context, VpnProfileImportActivity::class.java)) },
+					onQr = { scanner.launch(ScanOptions().setDesiredBarcodeFormats(ScanOptions.QR_CODE).setBeepEnabled(false).setOrientationLocked(true).setPrompt("")) },
+				)
+
+				val others = all.filter { it.getUUID().toString() != uuid }
+				fun nameOf(other: String?) = others.firstOrNull { it.getUUID().toString() == other }?.let { it.name ?: it.gateway }
+				Group(stringResource(R.string.server_group_server))
+				{
+					ValueRow(stringResource(R.string.server_addr), profile.gateway + (profile.port?.let { ":$it" } ?: ""), onClick = ::edit, divider = true)
+					ValueRow(stringResource(R.string.server_login), stringResource(loginLabel(profile.vpnType)), onClick = ::edit)
+				}
+				Group(stringResource(R.string.server_group_resilience))
+				{
+					ValueRow(
+						stringResource(R.string.server_ports), extra.backupPorts.joinToString(", ").ifEmpty { stringResource(R.string.server_none) },
+						sub = stringResource(R.string.server_ports_sub), onClick = { showPorts = true }, divider = true,
+					)
+					ValueRow(
+						stringResource(R.string.server_reserve), nameOf(extra.reserveUuid) ?: stringResource(R.string.server_none),
+						sub = stringResource(R.string.server_reserve_sub, RESERVE_TIMEOUT_S), onClick = { picker = Picker.RESERVE }, divider = true,
+					)
+					val bridgeName = nameOf(extra.bridgeUuid)
+					ToggleRow(
+						stringResource(R.string.server_bridge),
+						if (bridgeName != null) stringResource(R.string.server_bridge_sub, bridgeName) else stringResource(R.string.server_bridge_pick),
+						extra.bridgeEnabled && bridgeName != null,
+					) { on ->
+						if (on && bridgeName == null) picker = Picker.BRIDGE
+						else ProfileExtras.update(context, uuid) { it.copy(bridgeEnabled = on) }
+					}
+				}
+				Group(stringResource(R.string.server_group_network))
+				{
+					ValueRow("DNS", profile.dnsServers?.takeIf { it.isNotBlank() }?.replace(" ", ", ") ?: stringResource(R.string.server_dns_default), onClick = ::edit, divider = true)
+					ValueRow("MTU", profile.mtu?.toString() ?: stringResource(R.string.server_auto_value), onClick = ::edit, divider = true)
+					ToggleRow(stringResource(R.string.server_fragmentation), null, extra.ikeFragmentation) { on ->
+						ProfileExtras.update(context, uuid) { it.copy(ikeFragmentation = on) }
+					}
+				}
+				Row(horizontalArrangement = Arrangement.spacedBy(10.dp), modifier = Modifier.padding(top = 4.dp))
+				{
+					ShxButton(stringResource(R.string.server_export), { export() }, style = ShxButtonStyle.OUTLINE, height = 52.dp, modifier = Modifier.weight(1f))
+					Box(
+						contentAlignment = Alignment.Center,
+						modifier = Modifier.weight(1f).height(52.dp).clip(RoundedCornerShape(18.dp)).border(1.dp, c.errorBorder, RoundedCornerShape(18.dp))
+							.clickable(role = Role.Button) { showDelete = true },
+					)
+					{
+						Text(stringResource(R.string.server_delete_confirm), style = ShxType.body.copy(fontWeight = FontWeight.Bold), color = c.error)
+					}
+				}
+			}
+		}
+		ShxSnackbarHost(snackbar, Modifier.align(Alignment.BottomCenter).navigationBarsPadding())
+	}
+
+	if (showShare)
+	{
+		ShareProfileScreen(profile, onDismiss = { showShare = false }, onSendFile = { export() })
+	}
+	check?.let { found ->
+		ProfileUpdateSheet(
+			name = profile.name ?: profile.gateway,
+			check = found,
+			onLater = { check = null },
+			onApply = {
+				check = null
+				scope.launch {
+					withContext(Dispatchers.IO) { ProfileUpdater.apply(context, found) }
+					reloads++
+					snackbar.showSnackbar(updated)
+				}
+			},
+		)
+	}
+	if (showDelete)
+	{
+		ShxDialog(
+			title = stringResource(R.string.server_delete_title, profile.name ?: profile.gateway),
+			paragraphs = listOfNotNull(
+				if (active && vpn?.first != VpnStateService.State.DISABLED) stringResource(R.string.server_delete_current) else null,
+				stringResource(R.string.server_delete_restore),
+			),
+			confirm = stringResource(R.string.server_delete_confirm),
+			dismiss = stringResource(android.R.string.cancel),
+			onConfirm = {
+				showDelete = false
+				scope.launch {
+					withContext(Dispatchers.IO) {
+						if (active) VpnStateService.getLiveInstance()?.disconnect()
+						val source = VpnProfileSource(context)
+						source.open()
+						try { source.deleteVpnProfile(profile) } finally { source.close() }
+					}
+					val intent = Intent(Constants.VPN_PROFILES_CHANGED).putExtra(Constants.VPN_PROFILES_MULTIPLE, arrayOf(uuid))
+					LocalBroadcastManager.getInstance(context).sendBroadcast(intent)
+					onBack()
+				}
+			},
+			onDismiss = { showDelete = false },
+			icon = ShxIcons.Trash,
+			danger = true,
+		)
+	}
+	if (showLink)
+	{
+		TextDialog(
+			title = stringResource(R.string.server_link_title),
+			label = stringResource(R.string.server_link_label),
+			initial = extra.sourceValue?.takeIf { extra.source == ProfileSourceType.LINK } ?: "https://",
+			keyboard = KeyboardType.Uri,
+			validate = { it.startsWith("https://") && it.length > 10 },
+			onDone = { link ->
+				showLink = false
+				ProfileExtras.update(context, uuid) { it.copy(source = ProfileSourceType.LINK, sourceValue = link.trim(), autoUpdate = true) }
+				runCheck()
+			},
+			onDismiss = { showLink = false },
+		)
+	}
+	if (showPorts)
+	{
+		TextDialog(
+			title = stringResource(R.string.server_ports),
+			label = stringResource(R.string.server_ports_label),
+			initial = extra.backupPorts.joinToString(", "),
+			keyboard = KeyboardType.Number,
+			validate = { text -> parsePorts(text) != null },
+			onDone = { text ->
+				showPorts = false
+				ProfileExtras.update(context, uuid) { it.copy(backupPorts = parsePorts(text).orEmpty()) }
+			},
+			onDismiss = { showPorts = false },
+		)
+	}
+	picker?.let { which ->
+		val others = all.filter { it.getUUID().toString() != uuid }
+		ShxSheet(onDismiss = { picker = null })
+		{
+			ShxSheetTitle(stringResource(if (which == Picker.RESERVE) R.string.server_reserve else R.string.server_bridge_title))
+			Text(
+				stringResource(if (which == Picker.RESERVE) R.string.server_reserve_pick_note else R.string.server_bridge_pick_note),
+				style = ShxType.note.copy(fontWeight = FontWeight.Normal, lineHeight = 19.sp), color = c.textSoft, modifier = Modifier.padding(horizontal = 4.dp),
+			)
+			ShxPanel()
+			{
+				val current = if (which == Picker.RESERVE) extra.reserveUuid else extra.bridgeUuid
+				val rows = listOf<VpnProfile?>(null) + others
+				rows.forEachIndexed { i, other ->
+					val id = other?.getUUID()?.toString()
+					Row(
+						verticalAlignment = Alignment.CenterVertically,
+						horizontalArrangement = Arrangement.spacedBy(12.dp),
+						modifier = Modifier.fillMaxWidth().heightIn(min = 56.dp).clickable(role = Role.Button) {
+							picker = null
+							ProfileExtras.update(context, uuid) {
+								if (which == Picker.RESERVE) it.copy(reserveUuid = id) else it.copy(bridgeUuid = id, bridgeEnabled = id != null)
+							}
+						}.padding(horizontal = 16.dp),
+					)
+					{
+						Text(other?.let { it.name ?: it.gateway } ?: stringResource(R.string.server_none), style = ShxType.rowTitle.copy(fontSize = 15.sp), color = c.text, modifier = Modifier.weight(1f))
+						if (current == id)
+						{
+							Icon(ShxIcons.Check, contentDescription = null, tint = c.accent, modifier = Modifier.size(20.dp))
+						}
+					}
+					if (i < rows.lastIndex)
+					{
+						Box(Modifier.fillMaxWidth().height(1.dp).background(c.tile))
+					}
+				}
+			}
+		}
+	}
+}
+
+/** «443, 53» → [443, 53]; null when something is not a port. */
+internal fun parsePorts(text: String): List<Int>?
+{
+	val parts = text.split(',', ' ', ';').map { it.trim() }.filter { it.isNotEmpty() }
+	val ports = parts.map { it.toIntOrNull()?.takeIf { p -> p in 1..65535 } ?: return null }
+	return ports.distinct()
+}
+
+private fun loginLabel(type: VpnType): Int = when (type)
+{
+	VpnType.IKEV2_CERT, VpnType.IKEV2_EAP_TLS -> R.string.server_login_cert
+	VpnType.IKEV2_CERT_EAP -> R.string.server_login_both
+	else -> R.string.server_login_password
+}
+
+@Composable
+private fun SourceSection(
+	extra: ProfileExtra,
+	checking: Boolean,
+	onEditLink: () -> Unit,
+	onAuto: (Boolean) -> Unit,
+	onCheck: () -> Unit,
+	onFile: () -> Unit,
+	onQr: () -> Unit,
+)
+{
+	val c = LocalShxColors.current
+	val date = if (extra.addedAt > 0) SimpleDateFormat("d MMM", Locale.getDefault()).format(Date(extra.addedAt)) else null
+	val type = if (extra.source == ProfileSourceType.UNKNOWN) ProfileSourceType.FILE else extra.source
+	ShxSectionHeader(stringResource(R.string.server_source).uppercase(), Modifier.padding(start = 6.dp, end = 6.dp, top = 6.dp))
+	ShxPanel()
+	{
+		val (icon, label, value) = when (type)
+		{
+			ProfileSourceType.LINK -> Triple(ShxIcons.Globe, stringResource(R.string.server_source_link), extra.sourceValue.orEmpty().removePrefix("https://"))
+			ProfileSourceType.QR -> Triple(ShxIcons.Scan, stringResource(R.string.server_source_qr), date?.let { stringResource(R.string.server_source_scanned, it) } ?: "")
+			ProfileSourceType.MANUAL -> Triple(ShxIcons.Sliders, stringResource(R.string.server_source_manual), date?.let { stringResource(R.string.server_source_created, it) } ?: "")
+			else -> Triple(
+				ShxIcons.Doc, stringResource(R.string.server_source_file),
+				listOfNotNull(extra.sourceValue, date?.let { stringResource(R.string.server_source_added, it) }).joinToString(" · ")
+					.ifEmpty { stringResource(R.string.server_source_earlier) },
+			)
+		}
+		Row(
+			verticalAlignment = Alignment.CenterVertically,
+			horizontalArrangement = Arrangement.spacedBy(12.dp),
+			modifier = Modifier.fillMaxWidth()
+				.then(if (type == ProfileSourceType.LINK) Modifier.clickable(role = Role.Button, onClick = onEditLink) else Modifier)
+				.padding(start = 16.dp, end = 14.dp, top = 12.dp, bottom = 12.dp),
+		)
+		{
+			Box(contentAlignment = Alignment.Center, modifier = Modifier.size(36.dp).clip(RoundedCornerShape(12.dp)).background(c.tile))
+			{
+				Icon(icon, contentDescription = null, tint = c.onAccentContainer, modifier = Modifier.size(18.dp))
+			}
+			Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(2.dp))
+			{
+				Text(label, style = ShxType.chip, color = c.textSub)
+				Text(
+					value, maxLines = 1, overflow = TextOverflow.Ellipsis,
+					style = ShxType.body.copy(fontWeight = FontWeight.Bold, fontFamily = if (type == ProfileSourceType.LINK) FontFamily.Monospace else ShxType.body.fontFamily),
+					color = c.text,
+				)
+			}
+			if (type == ProfileSourceType.LINK)
+			{
+				Icon(ShxIcons.Sliders, contentDescription = stringResource(R.string.server_link_title), tint = c.textSub, modifier = Modifier.size(18.dp))
+			}
+		}
+		Divider()
+		if (type == ProfileSourceType.LINK)
+		{
+			val now = System.currentTimeMillis()
+			val checked = when
+			{
+				extra.checkedAt <= 0 -> null
+				now - extra.checkedAt < DateUtils.MINUTE_IN_MILLIS -> stringResource(R.string.server_just_now)
+				else -> DateUtils.getRelativeTimeSpanString(extra.checkedAt, now, DateUtils.MINUTE_IN_MILLIS).toString()
+			}
+			val result = when
+			{
+				extra.lastChanges < 0 -> stringResource(R.string.server_auto_failed)
+				extra.lastChanges > 0 -> stringResource(R.string.server_auto_changes, extra.lastChanges)
+				else -> stringResource(R.string.server_auto_same)
+			}
+			ToggleRow(
+				stringResource(R.string.server_auto),
+				listOfNotNull(stringResource(R.string.server_auto_daily), checked?.let { stringResource(R.string.server_auto_checked, it) }, if (checked != null) result else null).joinToString(" · "),
+				extra.autoUpdate, onAuto,
+			)
+			Divider()
+		}
+		else
+		{
+			Text(
+				stringResource(
+					when (type)
+					{
+						ProfileSourceType.QR -> R.string.server_note_qr
+						ProfileSourceType.MANUAL -> R.string.server_note_manual
+						else -> R.string.server_note_file
+					}
+				),
+				style = ShxType.meta.copy(fontWeight = FontWeight.Normal, lineHeight = 17.sp), color = c.textSub,
+				modifier = Modifier.padding(horizontal = 16.dp, vertical = 10.dp),
+			)
+			if (type != ProfileSourceType.MANUAL)
+			{
+				Divider()
+			}
+		}
+		if (type != ProfileSourceType.MANUAL)
+		{
+			Row(horizontalArrangement = Arrangement.spacedBy(8.dp), modifier = Modifier.height(androidx.compose.foundation.layout.IntrinsicSize.Min).padding(horizontal = 14.dp, vertical = 12.dp))
+			{
+				when (type)
+				{
+					ProfileSourceType.LINK -> SoftButton(stringResource(if (checking) R.string.server_checking else R.string.server_check_now), onCheck, Modifier.weight(1f))
+					ProfileSourceType.QR -> SoftButton(stringResource(R.string.server_replace_qr), onQr, Modifier.weight(1f))
+					else ->
+					{
+						SoftButton(stringResource(R.string.server_replace_file), onFile, Modifier.weight(1f))
+						Box(
+							contentAlignment = Alignment.Center,
+							modifier = Modifier.weight(1f).heightIn(min = 44.dp).clip(RoundedCornerShape(14.dp)).border(1.dp, c.outline, RoundedCornerShape(14.dp))
+								.clickable(role = Role.Button, onClick = onEditLink).padding(horizontal = 10.dp, vertical = 6.dp),
+						)
+						{
+							Text(stringResource(R.string.server_set_link), style = ShxType.body.copy(fontWeight = FontWeight.Bold), color = c.text)
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+@Composable
+private fun SoftButton(text: String, onClick: () -> Unit, modifier: Modifier)
+{
+	val c = LocalShxColors.current
+	Box(
+		contentAlignment = Alignment.Center,
+		modifier = modifier.heightIn(min = 44.dp).clip(RoundedCornerShape(14.dp)).background(c.accentMuted).clickable(role = Role.Button, onClick = onClick)
+			.padding(horizontal = 10.dp, vertical = 6.dp),
+	)
+	{
+		Text(text, style = ShxType.body.copy(fontWeight = FontWeight.ExtraBold), color = c.textTonal, maxLines = 2, textAlign = androidx.compose.ui.text.style.TextAlign.Center)
+	}
+}
+
+@Composable
+private fun Divider()
+{
+	Box(Modifier.fillMaxWidth().height(1.dp).background(LocalShxColors.current.tile))
+}
+
+@Composable
+private fun Group(title: String, content: @Composable ColumnScope.() -> Unit)
+{
+	Column(verticalArrangement = Arrangement.spacedBy(6.dp))
+	{
+		ShxSectionHeader(title.uppercase(), Modifier.padding(start = 6.dp, end = 6.dp, top = 6.dp))
+		ShxPanel(content = content)
+	}
+}
+
+@Composable
+private fun ValueRow(title: String, value: String, sub: String? = null, onClick: () -> Unit, divider: Boolean = false)
+{
+	val c = LocalShxColors.current
+	Row(
+		verticalAlignment = Alignment.CenterVertically,
+		horizontalArrangement = Arrangement.spacedBy(10.dp),
+		modifier = Modifier.fillMaxWidth().heightIn(min = 58.dp).clickable(role = Role.Button, onClick = onClick).padding(start = 16.dp, end = 14.dp, top = 8.dp, bottom = 8.dp),
+	)
+	{
+		Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(2.dp))
+		{
+			Text(title, style = ShxType.rowTitle.copy(fontSize = 15.sp), color = c.text)
+			sub?.let { Text(it, style = ShxType.meta.copy(fontWeight = FontWeight.Normal, lineHeight = 16.sp), color = c.textSub) }
+		}
+		Text(value, style = ShxType.body, color = c.textSub, maxLines = 1, overflow = TextOverflow.Ellipsis, modifier = Modifier.weight(0.8f, fill = false))
+		Icon(ShxIcons.Chevron, contentDescription = null, tint = c.textSub, modifier = Modifier.size(18.dp))
+	}
+	if (divider)
+	{
+		Divider()
+	}
+}
+
+@Composable
+private fun ToggleRow(title: String, sub: String?, checked: Boolean, onChange: (Boolean) -> Unit)
+{
+	val c = LocalShxColors.current
+	Row(
+		verticalAlignment = Alignment.CenterVertically,
+		horizontalArrangement = Arrangement.spacedBy(10.dp),
+		modifier = Modifier.fillMaxWidth().heightIn(min = 58.dp).padding(start = 16.dp, end = 14.dp, top = 8.dp, bottom = 8.dp),
+	)
+	{
+		Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(2.dp))
+		{
+			Text(title, style = ShxType.rowTitle.copy(fontSize = 15.sp), color = c.text)
+			sub?.let { Text(it, style = ShxType.meta.copy(fontWeight = FontWeight.Normal, lineHeight = 16.sp), color = c.textSub) }
+		}
+		ShxSwitch(checked, onChange)
+	}
+}
+
+@Composable
+private fun TextDialog(
+	title: String,
+	label: String,
+	initial: String,
+	keyboard: KeyboardType,
+	validate: (String) -> Boolean,
+	onDone: (String) -> Unit,
+	onDismiss: () -> Unit,
+)
+{
+	var text by remember { mutableStateOf(initial) }
+	ShxAlertDialog(
+		onDismissRequest = onDismiss,
+		title = { Text(title) },
+		text = {
+			ShxFormField(label = label, value = text, onValueChange = { text = it }, keyboardOptions = KeyboardOptions(keyboardType = keyboard))
+		},
+		confirmButton = { TextButton(onClick = { onDone(text) }, enabled = validate(text.trim())) { Text(stringResource(R.string.server_save)) } },
+		dismissButton = { TextButton(onClick = onDismiss) { Text(stringResource(android.R.string.cancel)) } },
+	)
+}
+
+/** «The profile has changes» (F_ProfileUpdate): old → new per field, «Later» / «Apply and reconnect». */
+@Composable
+private fun ProfileUpdateSheet(name: String, check: ProfileCheck, onLater: () -> Unit, onApply: () -> Unit)
+{
+	val c = LocalShxColors.current
+	ShxSheet(onDismiss = onLater)
+	{
+		Column(verticalArrangement = Arrangement.spacedBy(14.dp))
+		{
+			Column(verticalArrangement = Arrangement.spacedBy(4.dp), modifier = Modifier.padding(horizontal = 4.dp))
+			{
+				Text(stringResource(R.string.profile_update_title), style = ShxType.sheetTitle, color = c.text)
+				Text(stringResource(R.string.profile_update_sub, name), style = ShxType.body.copy(fontWeight = FontWeight.Normal), color = c.textSub)
+			}
+			ShxPanel()
+			{
+				check.changes.forEachIndexed { i, change ->
+					Column(verticalArrangement = Arrangement.spacedBy(4.dp), modifier = Modifier.fillMaxWidth().padding(horizontal = 16.dp, vertical = 12.dp))
+					{
+						Text(change.label, style = ShxType.chip, color = c.textSub)
+						Row(verticalAlignment = Alignment.CenterVertically, horizontalArrangement = Arrangement.spacedBy(8.dp))
+						{
+							val mono = ShxType.body.copy(fontWeight = FontWeight.Bold, fontFamily = FontFamily.Monospace)
+							Text(change.old, style = mono.copy(textDecoration = TextDecoration.LineThrough), color = c.iconMuted, maxLines = 1, overflow = TextOverflow.Ellipsis, modifier = Modifier.weight(1f, fill = false))
+							Icon(ShxIcons.Chevron, contentDescription = null, tint = c.textSub, modifier = Modifier.size(16.dp))
+							Text(change.new, style = mono, color = c.text, maxLines = 1, overflow = TextOverflow.Ellipsis, modifier = Modifier.weight(1f, fill = false))
+						}
+					}
+					if (i < check.changes.lastIndex)
+					{
+						Divider()
+					}
+				}
+			}
+			Row(
+				horizontalArrangement = Arrangement.spacedBy(10.dp),
+				modifier = Modifier.fillMaxWidth().clip(RoundedCornerShape(18.dp)).background(c.successContainer).padding(horizontal = 14.dp, vertical = 12.dp),
+			)
+			{
+				Icon(ShxIcons.Shield, contentDescription = null, tint = c.onSuccess, modifier = Modifier.size(20.dp))
+				Text(stringResource(R.string.profile_update_keep), style = ShxType.note.copy(lineHeight = 19.sp, fontWeight = FontWeight.Normal), color = c.onSuccess)
+			}
+			Row(horizontalArrangement = Arrangement.spacedBy(10.dp))
+			{
+				ShxButton(stringResource(R.string.cert_later), onLater, style = ShxButtonStyle.OUTLINE, modifier = Modifier.weight(1f))
+				ShxButton(stringResource(R.string.profile_update_apply), onApply, modifier = Modifier.weight(2f))
+			}
+		}
+	}
+}

src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileDetailActivity.kt

@@ -95,6 +95,7 @@ class VpnProfileDetailActivity : AppCompatActivity()
 						val profile = checked.toProfile(existing)
 						if (existing != null) dataSource.updateVpnProfile(profile)
 						else dataSource.insertProfile(profile)
+						if (existing == null) org.strongswan.android.logic.profiles.ProfileExtras.recordManual(this@VpnProfileDetailActivity, profile.getUUID().toString())
 						val intent = Intent(Constants.VPN_PROFILES_CHANGED)
 						intent.putExtra(Constants.VPN_PROFILES_SINGLE, profile.getUUID().toString())
 						LocalBroadcastManager.getInstance(this).sendBroadcast(intent)

src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java

@@ -34,6 +34,7 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.strongswan.android.R;
+import org.strongswan.android.logic.profiles.ProfileExtras;
 import org.strongswan.android.data.VpnProfile;
 import org.strongswan.android.data.VpnProfile.SelectedAppsHandling;
 import org.strongswan.android.data.VpnProfileDataSource;
@@ -668,6 +669,11 @@ public class VpnProfileImportActivity extends AppCompatActivity
 					e.printStackTrace();
 				}
 			}
+			/* remember where it came from (F_Profile «Profile source») */
+			ProfileExtras.recordImport(this, mProfile.getUUID().toString(),
+									   mLastUri != null ? mLastUri.getScheme() : null,
+									   mLastUri != null ? mLastUri.toString() : null,
+									   mLastUri != null && mLastUri.getPath() != null && mLastUri.getPath().contains("/qr/"));
 			Intent intent = new Intent(Constants.VPN_PROFILES_CHANGED);
 			intent.putExtra(Constants.VPN_PROFILES_SINGLE, mProfile.getUUID().toString());
 			LocalBroadcastManager.getInstance(this).sendBroadcast(intent);

src/frontends/android/app/src/main/java/org/strongswan/android/ui/compose/InboxScreen.kt

@@ -307,5 +307,6 @@ private fun EventAction.labelRes(): Int = when (this)
 	EventAction.OPEN_LOG -> R.string.show_log
 	EventAction.INSTALL_UPDATE -> R.string.events_action_update
 	EventAction.SET_APP_DIRECT -> R.string.events_action_direct
+	EventAction.PROFILE_UPDATE -> R.string.events_action_profile_update
 	EventAction.NONE -> R.string.events_action_open
 }

src/frontends/android/app/src/main/java/org/strongswan/android/ui/compose/ProfileEditorPane.kt

@@ -70,6 +70,7 @@ fun ProfileEditorPane(
 			val saved = checked.toProfile(profile)
 			if (profile != null) dataSource.updateVpnProfile(saved)
 			else dataSource.insertProfile(saved)
+			if (profile == null) org.strongswan.android.logic.profiles.ProfileExtras.recordManual(context, saved.getUUID().toString())
 			val intent = Intent(Constants.VPN_PROFILES_CHANGED)
 			intent.putExtra(Constants.VPN_PROFILES_SINGLE, saved.getUUID().toString())
 			LocalBroadcastManager.getInstance(context).sendBroadcast(intent)

src/frontends/android/app/src/main/java/org/strongswan/android/ui/compose/ShxApp.kt

@@ -131,9 +131,8 @@ fun ShxApp(viewModel: HomeViewModel = viewModel())
 		}
 	}
 	val editProfile: (VpnProfile) -> Unit = { profile ->
-		val intent = Intent(context, VpnProfileDetailActivity::class.java)
+		/* F_Profile: the server page, editing goes from there */
-		intent.putExtra(VpnProfileDataSource.KEY_UUID, profile.getUUID().toString())
+		context.startActivity(org.strongswan.android.ui.ServerActivity.intent(context, profile.getUUID().toString()))
-		context.startActivity(intent)
 	}
 	var pendingShare by remember { mutableStateOf<VpnProfile?>(null) }
 	val shareProfile: (VpnProfile) -> Unit = { pendingShare = it }

src/frontends/android/app/src/main/jni/libandroidbridge/backend/android_service.c

@@ -846,6 +846,9 @@ static job_requeue_t initiate(private_android_service_t *this)
 											  IKEV2_UDP_PORT);
 	ike.no_certreq = !this->settings->get_bool(this->settings,
 											   "connection.certreq", TRUE);
+	/* per-profile switch of the app (F_Profile «IKE fragmentation») */
+	ike.fragmentation = this->settings->get_bool(this->settings,
+							"connection.fragmentation", TRUE) ? FRAGMENTATION_YES : FRAGMENTATION_NO;
 	ike_cfg = ike_cfg_create(&ike);
 	proposal = parse_proposal(this, PROTO_IKE, "connection.ike_proposal");
 	if (proposal)

src/frontends/android/app/src/main/res/values-ru/strings.xml

@@ -1151,4 +1151,76 @@
     <string name="stats_fresh_text">Через неделю здесь будет видно, сколько трафика идёт через VPN и сколько напрямую, и какие приложения тратят больше всего.</string>
     <string name="home_traffic_today">сегодня</string>
     <string name="widget_server_today">%1$s · %2$s сегодня</string>
+    <string name="profile_update_addr">Адрес сервера</string>
+    <string name="profile_update_port">Порт</string>
+    <string name="profile_update_id">Имя сервера</string>
+    <string name="profile_update_ca">Сертификат CA</string>
+    <string name="profile_update_until">до %1$s</string>
+    <string name="event_profile_update_title">В профиле «%1$s» есть изменения</string>
+    <string name="event_profile_update_text">Администратор обновил профиль по ссылке: изменений — %1$d. Примените их, чтобы подключение не пропало.</string>
+    <string name="events_action_profile_update">Показать изменения</string>
+    <string name="server_share">Поделиться</string>
+    <string name="server_state_connected">Подключён</string>
+    <string name="server_state_connected_ms">Подключён · %1$d мс</string>
+    <string name="server_state_connecting">Подключается…</string>
+    <string name="server_state_answers">Отвечает · %1$d мс</string>
+    <string name="server_state_no_answer">Не отвечает</string>
+    <string name="server_source">Источник профиля</string>
+    <string name="server_source_link">Ссылка</string>
+    <string name="server_source_file">Файл</string>
+    <string name="server_source_qr">QR-код</string>
+    <string name="server_source_manual">Вручную</string>
+    <string name="server_source_added">добавлен %1$s</string>
+    <string name="server_source_scanned">отсканирован %1$s</string>
+    <string name="server_source_created">создан %1$s</string>
+    <string name="server_source_earlier">добавлен ранее</string>
+    <string name="server_auto">Обновлять автоматически</string>
+    <string name="server_auto_daily">Раз в сутки</string>
+    <string name="server_auto_checked">проверено %1$s</string>
+    <string name="server_auto_same">изменений нет</string>
+    <string name="server_auto_changes">изменений: %1$d</string>
+    <string name="server_auto_failed">проверить не удалось</string>
+    <string name="server_note_file">Обновлять автоматически нечего: у файла нет ссылки. Новый файл от администратора — «Заменить из файла», настройки ниже сохранятся.</string>
+    <string name="server_note_qr">Обновить можно, отсканировав новый QR — настройки ниже сохранятся.</string>
+    <string name="server_note_manual">Адрес, вход и сертификат правятся прямо в группе «Сервер» ниже.</string>
+    <string name="server_check_now">Проверить сейчас</string>
+    <string name="server_checking">Проверяем…</string>
+    <string name="server_replace_file">Заменить из файла…</string>
+    <string name="server_replace_qr">Заменить по QR…</string>
+    <string name="server_set_link">Указать ссылку</string>
+    <string name="server_link_title">Ссылка на профиль</string>
+    <string name="server_link_label">https://…/profile.sswan</string>
+    <string name="server_save">Сохранить</string>
+    <string name="server_group_server">Сервер</string>
+    <string name="server_group_resilience">Устойчивость</string>
+    <string name="server_group_network">Сеть</string>
+    <string name="server_addr">Адрес</string>
+    <string name="server_login">Вход</string>
+    <string name="server_login_password">Логин</string>
+    <string name="server_login_cert">Сертификат</string>
+    <string name="server_login_both">Оба</string>
+    <string name="server_ports">Запасные порты</string>
+    <string name="server_ports_sub">По очереди, если основной не отвечает</string>
+    <string name="server_ports_label">Порты через запятую</string>
+    <string name="server_reserve">Резервный сервер</string>
+    <string name="server_reserve_sub">Если не подключился за %1$d с</string>
+    <string name="server_reserve_pick_note">Подключимся к нему, когда этот сервер не отвечает.</string>
+    <string name="server_bridge">Мост при белых списках</string>
+    <string name="server_bridge_title">Мост</string>
+    <string name="server_bridge_sub">Переключаться на «%1$s»</string>
+    <string name="server_bridge_pick">Выберите сервер с российским адресом</string>
+    <string name="server_bridge_pick_note">Сервер с российским адресом работает, даже когда оператор включает белые списки.</string>
+    <string name="server_none">Нет</string>
+    <string name="server_dns_default">Как в настройках</string>
+    <string name="server_auto_value">Авто</string>
+    <string name="server_fragmentation">Фрагментация IKE</string>
+    <string name="server_export">Экспорт .sswan</string>
+    <string name="profile_check_none">Изменений в профиле нет</string>
+    <string name="profile_check_failed">Не удалось проверить ссылку</string>
+    <string name="profile_updated">Профиль обновлён</string>
+    <string name="profile_update_title">В профиле есть изменения</string>
+    <string name="profile_update_sub">%1$s · проверено только что по ссылке</string>
+    <string name="profile_update_keep">Останутся без изменений: запасные порты, резервный сервер, мост, DNS, правила и приложения.</string>
+    <string name="profile_update_apply">Применить и переподключить</string>
+    <string name="server_just_now">только что</string>
 </resources>

src/frontends/android/app/src/main/res/values/strings.xml

@@ -1137,4 +1137,76 @@
     <string name="stats_fresh_text">In a week you will see how much traffic goes through the VPN and how much direct, and which apps use the most.</string>
     <string name="home_traffic_today">today</string>
     <string name="widget_server_today">%1$s · %2$s today</string>
+    <string name="profile_update_addr">Server address</string>
+    <string name="profile_update_port">Port</string>
+    <string name="profile_update_id">Server identity</string>
+    <string name="profile_update_ca">CA certificate</string>
+    <string name="profile_update_until">until %1$s</string>
+    <string name="event_profile_update_title">The «%1$s» profile has changes</string>
+    <string name="event_profile_update_text">The admin updated the profile at its link: %1$d changes. Apply them to keep connecting.</string>
+    <string name="events_action_profile_update">Show changes</string>
+    <string name="server_share">Share</string>
+    <string name="server_state_connected">Connected</string>
+    <string name="server_state_connected_ms">Connected · %1$d ms</string>
+    <string name="server_state_connecting">Connecting…</string>
+    <string name="server_state_answers">Answers · %1$d ms</string>
+    <string name="server_state_no_answer">No answer</string>
+    <string name="server_source">Profile source</string>
+    <string name="server_source_link">Link</string>
+    <string name="server_source_file">File</string>
+    <string name="server_source_qr">QR code</string>
+    <string name="server_source_manual">Manual</string>
+    <string name="server_source_added">added %1$s</string>
+    <string name="server_source_scanned">scanned %1$s</string>
+    <string name="server_source_created">created %1$s</string>
+    <string name="server_source_earlier">added earlier</string>
+    <string name="server_auto">Update automatically</string>
+    <string name="server_auto_daily">Once a day</string>
+    <string name="server_auto_checked">checked %1$s</string>
+    <string name="server_auto_same">no changes</string>
+    <string name="server_auto_changes">changes: %1$d</string>
+    <string name="server_auto_failed">could not check</string>
+    <string name="server_note_file">Nothing to update automatically: a file has no link. A new file from the admin — «Replace from file», the settings below stay.</string>
+    <string name="server_note_qr">Update it by scanning a new QR — the settings below stay.</string>
+    <string name="server_note_manual">Address, sign-in and certificate are edited right in the «Server» group below.</string>
+    <string name="server_check_now">Check now</string>
+    <string name="server_checking">Checking…</string>
+    <string name="server_replace_file">Replace from file…</string>
+    <string name="server_replace_qr">Replace by QR…</string>
+    <string name="server_set_link">Set a link</string>
+    <string name="server_link_title">Profile link</string>
+    <string name="server_link_label">https://…/profile.sswan</string>
+    <string name="server_save">Save</string>
+    <string name="server_group_server">Server</string>
+    <string name="server_group_resilience">Resilience</string>
+    <string name="server_group_network">Network</string>
+    <string name="server_addr">Address</string>
+    <string name="server_login">Sign-in</string>
+    <string name="server_login_password">Login</string>
+    <string name="server_login_cert">Certificate</string>
+    <string name="server_login_both">Both</string>
+    <string name="server_ports">Backup ports</string>
+    <string name="server_ports_sub">In turn, if the main one does not answer</string>
+    <string name="server_ports_label">Ports, comma separated</string>
+    <string name="server_reserve">Reserve server</string>
+    <string name="server_reserve_sub">If it does not connect in %1$d s</string>
+    <string name="server_reserve_pick_note">Connect to it when this server does not answer.</string>
+    <string name="server_bridge">Bridge for whitelists</string>
+    <string name="server_bridge_title">Bridge</string>
+    <string name="server_bridge_sub">Switch to «%1$s»</string>
+    <string name="server_bridge_pick">Pick a server with a Russian address</string>
+    <string name="server_bridge_pick_note">A server with a Russian address still works when the operator turns on whitelists.</string>
+    <string name="server_none">None</string>
+    <string name="server_dns_default">As in settings</string>
+    <string name="server_auto_value">Auto</string>
+    <string name="server_fragmentation">IKE fragmentation</string>
+    <string name="server_export">Export .sswan</string>
+    <string name="profile_check_none">No changes in the profile</string>
+    <string name="profile_check_failed">Could not check the link</string>
+    <string name="profile_updated">Profile updated</string>
+    <string name="profile_update_title">The profile has changes</string>
+    <string name="profile_update_sub">%1$s · checked just now at the link</string>
+    <string name="profile_update_keep">Unchanged: backup ports, reserve server, bridge, DNS, rules and apps.</string>
+    <string name="profile_update_apply">Apply and reconnect</string>
+    <string name="server_just_now">just now</string>
 </resources>

src/frontends/android/app/src/test/java/org/strongswan/android/logic/profiles/ProfileUpdaterTest.kt

@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2026 SHX VPN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+package org.strongswan.android.logic.profiles
+
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+import org.strongswan.android.ui.parsePorts
+import java.util.Base64
+
+class ProfileUpdaterTest
+{
+	/* a self-signed test CA («SHX Test CA») */
+	private val ca = "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"
+	private val cert = java.security.cert.CertificateFactory.getInstance("X.509")
+		.generateCertificate(java.io.ByteArrayInputStream(Base64.getMimeDecoder().decode(ca))) as java.security.cert.X509Certificate
+
+	@Test
+	fun sameProfileHasNoChanges()
+	{
+		val remote = RemoteProfile("nl1.example", 4500, null, null)
+		assertThat(diff("nl1.example", null, null, null, remote)).isEmpty()
+	}
+
+	@Test
+	fun addressPortAndCaChanges()
+	{
+		val remote = RemoteProfile("nl2.example", 443, null, cert)
+		val changes = diff("nl1.example", null, null, null, remote)
+		assertThat(changes.map { it.field }).containsExactly(ProfileField.ADDRESS, ProfileField.PORT, ProfileField.CA)
+		assertThat(changes[0].old).isEqualTo("nl1.example")
+		assertThat(changes[0].new).isEqualTo("nl2.example")
+		assertThat(changes[1].old).isEqualTo(4500)
+		assertThat(changes[1].new).isEqualTo(443)
+		assertThat(changes[2].old).isNull()
+	}
+
+	@Test
+	fun sameCaIsNoChange()
+	{
+		val remote = RemoteProfile("nl1.example", null, null, cert)
+		assertThat(diff("nl1.example", 4500, null, remote.certificate, remote)).isEmpty()
+	}
+
+	@Test
+	fun remoteIdOnlyWhenGiven()
+	{
+		val remote = RemoteProfile("nl1.example", null, "vpn.example", null)
+		assertThat(diff("nl1.example", null, null, null, remote).single().field).isEqualTo(ProfileField.REMOTE_ID)
+	}
+
+	@Test
+	fun portsParse()
+	{
+		assertThat(parsePorts("443, 53")).containsExactly(443, 53)
+		assertThat(parsePorts("")).isEmpty()
+		assertThat(parsePorts("443, abc")).isNull()
+		assertThat(parsePorts("70000")).isNull()
+	}
+}