client: only send one SPICE_MSGC_MAIN_ATTACH_CHANNELS messages

492f7a9b fixed unwanted timeouts during initial client startup,
but it also caused a bad regression when connecting to
RHEL6+agent guests: the SPICE_MSGS_MAIN_ATTACH_CHANNELS message
was sent multiple times, once in RedClient::handle_init, then
once again in RedClient::on_agent_announce_capabilities (which
can even be triggered multiple times). Sending this message multiple
times is a big NO and causes the server to close the client connection,
and the client to die. Add a _msg_attach_message_sent boolean to
make sure we only send this message once.

rhbz #712938

2 files changed, 16 insertions, 8 deletions

diff --git a/client/red_client.cpp b/client/red_client.cpp
index 5b757b83..230e619e 100644
--- a/client/red_client.cpp
+++ b/client/red_client.cpp
@@ -357,6 +357,7 @@ RedClient::RedClient(Application& application)
     , _auto_display_res (false)
     , _agent_reply_wait_type (-1)
     , _aborting (false)
+    , _msg_attach_channels_sent(false)
     , _agent_connected (false)
     , _agent_mon_config_sent (false)
     , _agent_disp_config_sent (false)
@@ -967,16 +968,12 @@ void RedClient::handle_init(RedPeer::InMessage* message)
         if (_auto_display_res) {
            send_agent_monitors_config();
         }
-        if (_auto_display_res || !_display_setting.is_empty()) {
-            _application.activate_interval_timer(*_agent_timer, AGENT_TIMEOUT);
-        } else {
-            post_message(new Message(SPICE_MSGC_MAIN_ATTACH_CHANNELS));
-        }
+        _application.activate_interval_timer(*_agent_timer, AGENT_TIMEOUT);
     } else {
         if (_auto_display_res || !_display_setting.is_empty()) {
             LOG_WARN("no agent running, display options have been ignored");
         }
-        post_message(new Message(SPICE_MSGC_MAIN_ATTACH_CHANNELS));
+        send_main_attach_channels();
     }
 }
 
@@ -1023,6 +1020,15 @@ void RedClient::handle_agent_disconnected(RedPeer::InMessage* message)
     _agent_connected = false;
 }
 
+void RedClient::send_main_attach_channels(void)
+{
+    if (_msg_attach_channels_sent)
+        return;
+
+    post_message(new Message(SPICE_MSGC_MAIN_ATTACH_CHANNELS));
+    _msg_attach_channels_sent = true;
+}
+
 void RedClient::on_agent_announce_capabilities(
     VDAgentAnnounceCapabilities* caps, uint32_t msg_size)
 {
@@ -1053,7 +1059,7 @@ void RedClient::on_agent_announce_capabilities(
         if (!_display_setting.is_empty()) {
             LOG_WARN("display options have been requested, but the agent doesn't support these options");
         }
-        post_message(new Message(SPICE_MSGC_MAIN_ATTACH_CHANNELS));
+        send_main_attach_channels();
         _application.deactivate_interval_timer(*_agent_timer);
     }
 }
@@ -1073,7 +1079,7 @@ void RedClient::on_agent_reply(VDAgentReply* reply)
     case VD_AGENT_MONITORS_CONFIG:
     case VD_AGENT_DISPLAY_CONFIG:
         if (_agent_reply_wait_type == reply->type) {
-            post_message(new Message(SPICE_MSGC_MAIN_ATTACH_CHANNELS));
+            send_main_attach_channels();
             _application.deactivate_interval_timer(*_agent_timer);
             _agent_reply_wait_type = -1;
         }
diff --git a/client/red_client.h b/client/red_client.h
index ae52d9f2..4cb8e1a9 100644
--- a/client/red_client.h
+++ b/client/red_client.h
@@ -262,6 +262,7 @@ public:
 
     void set_mm_time(uint32_t time);
     uint32_t get_mm_time();
+    void send_main_attach_channels(void);
 
 protected:
     virtual void on_connecting();
@@ -321,6 +322,7 @@ private:
     int _agent_reply_wait_type;
 
     bool _aborting;
+    bool _msg_attach_channels_sent;
 
     bool _agent_connected;
     bool _agent_mon_config_sent;