From e6cb79b52c387ef6b266f81b2b75bfb3a0adba00 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fabian=20Gr=C3=BCnbichler?= <f.gruenbichler@proxmox.com>
Date: Fri, 6 Mar 2020 11:20:29 +0100
Subject: [PATCH] websocket_proxy: implement ping/pong support
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needed to keep tunnel connections alive.

> The Ping frame contains an opcode of 0x9.
> [...]
> The Pong frame contains an opcode of 0xA.
-- Section 5.5.2 cf. https://tools.ietf.org/html/rfc6455#section-5.5.2

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
 PVE/APIServer/AnyEvent.pm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/PVE/APIServer/AnyEvent.pm b/PVE/APIServer/AnyEvent.pm
index 666210d..90f51e8 100644
--- a/PVE/APIServer/AnyEvent.pm
+++ b/PVE/APIServer/AnyEvent.pm
@@ -511,6 +511,11 @@ sub websocket_proxy {
 				$reqstate->{proxyhdl}->push_shutdown();
 		    }
 			$hdl->push_shutdown();
+		    } elsif ($opcode == 9) {
+			# ping received, schedule pong
+			$reqstate->{hdl}->push_write($encode->(\$payload, "\x8A")) if $reqstate->{hdl};
+		    } elsif ($opcode == 0xA) {
+			# pong received, continue
 		    } else {
 			die "received unhandled websocket opcode $opcode\n";
 		    }