[PATCH server v2 05/13] red-channel: send marshaller message fd

[Marc-André Lureau <marcandre.lureau@xxxxxxxxx>]

From: Marc-André Lureau <mlureau@xxxxxxxxxx>

Send the fd associated to the last message sent.

Even if the fd is invalid, the sendfd msg is appended to the protocol,
for 2 reasons:
- trying to send an invalid fd does not have to close the connection (it
  would with an invalid fd)
- even if the fd is invalid, the protocol expects an extra byte for the
  ancillary data

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxx>
---
 server/red-channel.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/server/red-channel.c b/server/red-channel.c
index 306c87d..b33c91d 100644
--- a/server/red-channel.c
+++ b/server/red-channel.c
@@ -608,8 +608,24 @@ static inline void red_channel_client_release_sent_item(RedChannelClient *rcc)
 static void red_channel_peer_on_out_msg_done(void *opaque)
 {
     RedChannelClient *rcc = (RedChannelClient *)opaque;
+    int fd = spice_marshaller_get_fd(rcc->send_data.marshaller);
 
     rcc->send_data.size = 0;
+
+    if (fd != -1) {
+        if (fcntl(fd, F_GETFD) == -1) {
+            close(fd);
+            fd = -1;
+        }
+
+        if (reds_stream_send_msgfd(rcc->stream, fd) < 0) {
+            perror("sendfd");
+            red_channel_client_disconnect(rcc);
+            return;
+        }
+        close(fd);
+    }
+
     red_channel_client_release_sent_item(rcc);
     if (rcc->send_data.blocked) {
         rcc->send_data.blocked = FALSE;
-- 
2.5.0

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