Initial commit

.gitignore

@@ -0,0 +1,42 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/.name

@@ -0,0 +1 @@
+faucet

.idea/gradle.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="temurin-17" project-jdk-type="JavaSDK" />
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

build.gradle.kts

@@ -0,0 +1,43 @@
+plugins {
+    kotlin("multiplatform") version "2.2.20"
+}
+
+group = "eu.m724"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    mavenCentral()
+}
+
+kotlin {
+    val hostOs = System.getProperty("os.name")
+    val isArm64 = System.getProperty("os.arch") == "aarch64"
+    val isMingwX64 = hostOs.startsWith("Windows")
+    val nativeTarget = when {
+        hostOs == "Mac OS X" && isArm64 -> macosArm64("native")
+        hostOs == "Mac OS X" && !isArm64 -> macosX64("native")
+        hostOs == "Linux" && isArm64 -> linuxArm64("native")
+        hostOs == "Linux" && !isArm64 -> linuxX64("native")
+        isMingwX64 -> mingwX64("native")
+        else -> throw GradleException("Host OS is not supported in Kotlin/Native.")
+    }
+
+    nativeTarget.apply {
+        binaries {
+            executable {
+                entryPoint = "main"
+            }
+        }
+    }
+
+    sourceSets.apply {
+        nativeMain.dependencies {
+            implementation("io.ktor:ktor-network:3.3.1")
+        }
+
+        nativeTest.dependencies {
+            implementation(kotlin("test"))
+            implementation("org.jetbrains.kotlinx:kotlinx-coroutines-test:1.10.2")
+        }
+    }
+}

gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

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+rootProject.name = "faucet"

src/nativeMain/kotlin/BirdControl.kt

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+import io.ktor.network.selector.SelectorManager
+import io.ktor.network.sockets.Socket
+import io.ktor.network.sockets.UnixSocketAddress
+import io.ktor.network.sockets.aSocket
+import io.ktor.network.sockets.openReadChannel
+import io.ktor.network.sockets.openWriteChannel
+import io.ktor.utils.io.ByteReadChannel
+import io.ktor.utils.io.ByteWriteChannel
+import io.ktor.utils.io.readUTF8Line
+import io.ktor.utils.io.writeStringUtf8
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
+import kotlinx.coroutines.Job
+
+class BirdControl(
+    private val socketPath: String = "/run/bird/bird.ctl"
+) {
+    private var connected = false
+
+    private lateinit var socket: Socket
+    private lateinit var readChannel: ByteReadChannel
+    private lateinit var writeChannel: ByteWriteChannel
+
+    suspend fun connect() {
+        val socketAddress = UnixSocketAddress(socketPath)
+
+        val selectorManager = SelectorManager(Dispatchers.IO)
+        val builder = aSocket(selectorManager)
+            .tcp()
+
+        socket = builder.connect(socketAddress)
+
+        println("Connected to BIRD socket")
+
+        readChannel = socket.openReadChannel()
+        writeChannel = socket.openWriteChannel(autoFlush = true)
+
+        val line = readChannel.readUTF8Line()
+        println(line)
+
+        connected = true
+    }
+
+    suspend fun sendCommand(command: String) {
+        writeChannel.writeStringUtf8(command + "\n")
+        writeChannel.flush()
+    }
+
+    suspend fun readLine(): String? {
+        return readChannel.readUTF8Line()?.trim()
+    }
+
+    fun close() {
+        socket.close()
+    }
+}

src/nativeMain/kotlin/Main.kt

@@ -0,0 +1,101 @@
+import io.ktor.network.selector.SelectorManager
+import io.ktor.network.sockets.UnixSocketAddress
+import io.ktor.network.sockets.aSocket
+import io.ktor.network.sockets.openReadChannel
+import io.ktor.network.sockets.openWriteChannel
+import io.ktor.utils.io.readUTF8Line
+import io.ktor.utils.io.writeString
+import io.ktor.utils.io.writeStringUtf8
+import io.ktor.utils.io.writer
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
+import kotlinx.io.IOException
+import platform.posix.close
+import platform.posix.connect
+
+private const val SOCKET_PATH = "/run/bird/bird.ctl"
+
+fun main() {
+    val socketAddress = UnixSocketAddress(SOCKET_PATH)
+
+    val selectorManager = SelectorManager(Dispatchers.IO)
+    val builder= aSocket(selectorManager)
+        .tcp()
+
+    runBlocking {
+        val socket = builder.connect(socketAddress)
+
+        println("Connected")
+
+        val readChannel = socket.openReadChannel()
+        val line = readChannel.readUTF8Line()
+        println(line)
+
+        val writeChannel = socket.openWriteChannel()
+        writeChannel.writeStringUtf8("restrict\n")
+        writeChannel.flush()
+
+        val line2 = readChannel.readUTF8Line()
+        println(line2)
+    }
+
+
+    /*try {
+        val socket = serverSocket.accept()
+        val receiveChannel = socket.openReadChannel()
+
+        while (true) {
+            val line = receiveChannel.readUTF8Line()
+            println("Received line: $line")
+
+            if (line != null) {
+                receivedLines.add(line)
+            }
+        }
+    } catch (e: IOException) {
+        println("Server error: ${e.message}")
+    } finally {
+        println("Closing server socket")
+
+        serverSocket.close()
+        selectorManager.close()
+    }*/
+}
+
+/*@OptIn(ExperimentalForeignApi::class)
+fun main() {
+    val clientFd = socket(AF_UNIX, SOCK_STREAM, 0)
+    if (clientFd < 0) {
+        val errorMessage = getErrorMessage()
+        throw RuntimeException("Failed to create socket: $errorMessage")
+    }
+
+    memScoped {
+        val serverAddr = alloc<sockaddr_un>()
+        serverAddr.sun_family = AF_UNIX.toUShort()
+        strcpy(serverAddr.sun_path, SERVER_PATH)
+
+        if (connect(clientFd, serverAddr.ptr.reinterpret(), sizeOf<sockaddr_un>().toUInt()) < 0) {
+            val errorMessage = getErrorMessage()
+            close(clientFd)
+            throw RuntimeException("Unable to set the O_NONBLOCK flag: $errorMessage")
+        }
+
+        if (fcntl(clientFd, F_SETFL, O_NONBLOCK) < 0) {
+            val errorMessage = getErrorMessage()
+            throw RuntimeException("Unable to set the O_NONBLOCK flag: $errorMessage")
+        }
+
+        println("Connected to control server")
+
+        close(clientFd)
+    }
+}
+
+@OptIn(ExperimentalForeignApi::class)
+fun getErrorMessage(): String? {
+    return strerror(errno)?.toKString()
+}
+*/

src/nativeTest/kotlin/BirdControlTest.kt

@@ -0,0 +1,44 @@
+import kotlinx.coroutines.test.runTest
+import kotlin.random.Random
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class BirdControlTest {
+    @Test
+    fun `should connect and communicate`() = runTest {
+        val socketPath = "/tmp/faucet-test." + Random.nextLong().toString()
+
+        prepareServer(socketPath).use {
+            testRestrictCommand(socketPath)
+        }
+    }
+
+    private suspend fun prepareServer(
+        socketPath: String
+    ): TemporarySocketServer {
+        val server = TemporarySocketServer(
+            socketPath = socketPath,
+            responses = mapOf(
+                "restrict" to "0016 Access restricted"
+            )
+        )
+
+        server.start()
+
+        return server
+    }
+
+    private suspend fun testRestrictCommand(
+        socketPath: String
+    ) {
+        val birdControl = BirdControl(socketPath)
+        birdControl.connect()
+
+        println("Sending command")
+
+        birdControl.sendCommand("restrict")
+        assertEquals("0016 Access restricted", birdControl.readLine())
+
+        birdControl.close()
+    }
+}

src/nativeTest/kotlin/TemporarySocketServer.kt

@@ -0,0 +1,93 @@
+import io.ktor.network.selector.SelectorManager
+import io.ktor.network.sockets.ServerSocket
+import io.ktor.network.sockets.UnixSocketAddress
+import io.ktor.network.sockets.aSocket
+import io.ktor.network.sockets.openReadChannel
+import io.ktor.network.sockets.openWriteChannel
+import io.ktor.utils.io.readUTF8Line
+import io.ktor.utils.io.writeStringUtf8
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.IO
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+import kotlinx.coroutines.launch
+import kotlinx.io.IOException
+
+/**
+ * A temporary socket server that you can set to respond for specific messages.
+ *
+ * @param socketPath The UNIX socket path
+ * @param responses The question response map, newlines are added automatically, so don't add newlines
+ */
+class TemporarySocketServer(
+    private val socketPath: String = "/tmp/faucet-test-temp.123311", // TODO random
+    val responses: Map<String, String> = mutableMapOf()
+): AutoCloseable {
+    private val socketAddress = UnixSocketAddress(socketPath)
+
+    private val coroutineScope = CoroutineScope(Dispatchers.Default + Job())
+
+    private val _receivedLines = MutableSharedFlow<String>()
+    val receivedLines = _receivedLines.asSharedFlow()
+
+    private lateinit var selectorManager: SelectorManager
+    private lateinit var serverSocket: ServerSocket
+
+    suspend fun start() {
+        selectorManager = SelectorManager(Dispatchers.IO)
+
+        serverSocket = aSocket(selectorManager)
+            .configure {
+                reuseAddress = true
+                reusePort = true
+            }
+            .tcp()
+            .bind(socketAddress)
+
+        println("Listening on $socketPath")
+
+        coroutineScope.launch {
+            loop()
+        }
+    }
+
+    private suspend fun loop() {
+        try {
+            val socket = serverSocket.accept()
+            val readChannel = socket.openReadChannel()
+            val writeChannel = socket.openWriteChannel(autoFlush = true)
+
+            writeChannel.writeStringUtf8("0001 BIRD 3.1.4 ready.\n")
+
+            while (true) {
+                val line = readChannel.readUTF8Line()
+                println("Received line: $line")
+
+                if (line != null) {
+                    _receivedLines.emit(line)
+
+                    responses[line.trim()]?.let {
+                        writeChannel.writeStringUtf8(it + "\n")
+                    }
+                }
+            }
+        } catch (e: IOException) {
+            println("Server error: ${e.message}")
+        } finally {
+            println("Closing server socket")
+
+            serverSocket.close()
+            selectorManager.close()
+        }
+    }
+
+    override fun close() {
+        coroutineScope.cancel()
+        serverSocket.close()
+        selectorManager.close()
+    }
+}