chacha20 added

src/Agent/AgentClient.php

@@ -167,12 +167,6 @@ final class AgentClient
 
     private function handleInitialRequest(TcpConnection $connection, string $data): void
     {
-        if (!$this->authenticated || $this->pop === null) {
-            $connection->send("ERR pop_not_connected\n");
-            $connection->close();
-            return;
-        }
-
         $buffer = ($this->initialBuffers[$connection->id] ?? '') . $data;
         $this->initialBuffers[$connection->id] = $buffer;
 
@@ -428,6 +422,11 @@ final class AgentClient
 
     private function startPopSession(TcpConnection $connection, array $request, string $payloadBytes, string $ingressProtocol): void
     {
+        if (!$this->authenticated || $this->pop === null) {
+            $this->failOpeningLocalClient($connection, $ingressProtocol, 'pop_not_connected');
+            return;
+        }
+
         $sessionId = Uuid::v4();
         $this->connectionSessionIds[$connection->id] = $sessionId;
         $this->clients[$sessionId] = $connection;
@@ -448,6 +447,18 @@ final class AgentClient
         ]));
     }
 
+    private function failOpeningLocalClient(TcpConnection $connection, string $ingressProtocol, string $reason): void
+    {
+        if ($ingressProtocol === 'socks5') {
+            $connection->send($this->socks5Reply(1));
+        } elseif (str_starts_with($ingressProtocol, 'http')) {
+            $connection->send("HTTP/1.1 502 Bad Gateway\r\nConnection: close\r\nX-LayLink-Error: {$reason}\r\n\r\n");
+        } else {
+            $connection->send("ERR {$reason}\n");
+        }
+        $connection->close();
+    }
+
     private function onSocks5UdpMessage(UdpConnection $connection, string $data): void
     {
         if (!$this->authenticated || $this->pop === null || strlen($data) < 10) {