From b863a62ef2c1e71f3cdf4c74994369baa45dbce7 Mon Sep 17 00:00:00 2001
From: Ralph Boehme <slow@samba.org>
Date: Wed, 3 Aug 2016 15:00:45 +0200
Subject: [PATCH] async_req: make async_connect_send() "reentrant"
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Allow callers to pass in socket fds that where already passed to an
earlier call of async_connect_send(). Callers expect this behaviour and
it was working until 05d4dbda8357712cb81008e0d611fdb0e7239587 broke it.

The proper fix would be to change callers to close the fd and start from
scratch with a fresh socket.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=12105

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Thu Aug  4 05:03:21 CEST 2016 on sn-devel-144

(cherry picked from commit 9c6a4ea2788808bdcc7bfea798d838ea56c3b5ec)
---
 lib/async_req/async_sock.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/async_req/async_sock.c b/lib/async_req/async_sock.c
index c14acf3..3af1748 100644
--- a/lib/async_req/async_sock.c
+++ b/lib/async_req/async_sock.c
@@ -128,11 +128,21 @@ struct tevent_req *async_connect_send(
 	}
 
 	/*
-	 * The only errno indicating that the connect is still in
-	 * flight is EINPROGRESS, everything else is an error
+	 * The only errno indicating that an initial connect is still
+	 * in flight is EINPROGRESS.
+	 *
+	 * We get EALREADY when someone calls us a second time for a
+	 * given fd and the connect is still in flight (and returned
+	 * EINPROGRESS the first time).
+	 *
+	 * This allows callers like open_socket_out_send() to reuse
+	 * fds and call us with an fd for which the connect is still
+	 * in flight. The proper thing to do for callers would be
+	 * closing the fd and starting from scratch with a fresh
+	 * socket.
 	 */
 
-	if (errno != EINPROGRESS) {
+	if (errno != EINPROGRESS && errno != EALREADY) {
 		tevent_req_error(req, errno);
 		return tevent_req_post(req, ev);
 	}
-- 
2.7.4