fix: auto-close tab on graceful SSH disconnect (exit/Ctrl+D) (#723)

Distinguish between graceful shell exit and unexpected disconnection
using the stream close event's exit code. When the shell exits normally
(code != null), send "session_ended" instead of "disconnected". The
frontend auto-closes the tab on session_ended, and shows the reconnect
overlay only on unexpected disconnections.

Closes Termix-SSH/Support#643

src/backend/ssh/terminal.ts

@@ -1503,15 +1503,24 @@ wss.on("connection", async (ws: WebSocket, req) => {
             }
           });
 
-          stream.on("close", () => {
+          stream.on("close", (code: number | null) => {
             const session = sessionManager.getSession(boundSessionId);
             if (session?.attachedWs?.readyState === WebSocket.OPEN) {
-              session.attachedWs.send(
-                JSON.stringify({
-                  type: "disconnected",
-                  message: "Connection lost",
-                }),
-              );
+              if (code != null) {
+                session.attachedWs.send(
+                  JSON.stringify({
+                    type: "session_ended",
+                    code,
+                  }),
+                );
+              } else {
+                session.attachedWs.send(
+                  JSON.stringify({
+                    type: "disconnected",
+                    message: "Connection lost",
+                  }),
+                );
+              }
             }
             if (boundSessionId) {
               sessionManager.destroySession(boundSessionId);

src/locales/en.json

@@ -1676,6 +1676,7 @@
     "automaticFallback": "Automatically trying {{method}} authentication...",
     "totpTimeout": "TOTP verification timeout. Please reconnect.",
     "passwordTimeout": "Password verification timeout. Please reconnect.",
+    "sessionEnded": "Session ended.",
     "connectionRejected": "Connection rejected by server. Please check your authentication and network configuration.",
     "hostKeyRejected": "SSH host key verification rejected. Connection cancelled.",
     "sessionTakenOver": "Session was opened in another tab. Reconnecting...",

src/ui/desktop/apps/features/terminal/Terminal.tsx

@@ -1187,6 +1187,14 @@ const TerminalInner = forwardRef<TerminalHandle, SSHTerminalProps>(
                 );
               }
             }, 100);
+          } else if (msg.type === "session_ended") {
+            wasDisconnectedBySSH.current = true;
+            setIsConnected(false);
+            setIsConnecting(false);
+            shouldNotReconnectRef.current = true;
+            if (onClose) {
+              onClose();
+            }
           } else if (msg.type === "disconnected") {
             wasDisconnectedBySSH.current = true;
             shouldNotReconnectRef.current = true;

src/ui/mobile/apps/terminal/Terminal.tsx

@@ -729,6 +729,13 @@ const TerminalInner = forwardRef<TerminalHandle, SSHTerminalProps>(
                 );
               }
             }, 100);
+          } else if (msg.type === "session_ended") {
+            wasDisconnectedBySSH.current = true;
+            shouldNotReconnectRef.current = true;
+            isConnectingRef.current = false;
+            setIsConnected(false);
+            setIsConnecting(false);
+            updateConnectionError(t("terminal.sessionEnded"));
           } else if (msg.type === "disconnected") {
             wasDisconnectedBySSH.current = true;
             isConnectingRef.current = false;