test-filter-mirror: pass UNIX domain socket through fd

The tests tries to let qemu server mode to process the connection
which turns out to be racy after commit 8258292e ("monitor: Remove
"x-oob", offer capability "oob" unconditionally"). This is because the
filter may try to mirror the packets before UNIX socket object is
ready (connected was set to true) from the view of qemu. In this case
the packet will be dropped silently.

Fixing this by passing pre-connected socket created by socketpair() to
qemu through fd.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Li Zhijian <lizhijian@cn.fujitsu.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Zhang Chen <zhangckid@gmail.com>
Cc: Markus Armbruster <armbru@redhat.com>
Cc: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Zhang Chen <zhangckid@gmail.com>
Message-id: 20190130031427.13129-1-jasowang@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/test-filter-mirror.c

@@ -21,10 +21,9 @@
 
 static void test_mirror(void)
 {
-    int send_sock[2], recv_sock;
+    int send_sock[2], recv_sock[2];
     uint32_t ret = 0, len = 0;
     char send_buf[] = "Hello! filter-mirror~";
-    char sock_path[] = "filter-mirror.XXXXXX";
     char *recv_buf;
     uint32_t size = sizeof(send_buf);
     size = htonl(size);
@@ -38,18 +37,15 @@ static void test_mirror(void)
     ret = socketpair(PF_UNIX, SOCK_STREAM, 0, send_sock);
     g_assert_cmpint(ret, !=, -1);
 
-    ret = mkstemp(sock_path);
+    ret = socketpair(PF_UNIX, SOCK_STREAM, 0, recv_sock);
     g_assert_cmpint(ret, !=, -1);
 
     qts = qtest_initf(
         "-netdev socket,id=qtest-bn0,fd=%d "
         "-device %s,netdev=qtest-bn0,id=qtest-e0 "
-        "-chardev socket,id=mirror0,path=%s,server,nowait "
+        "-chardev socket,id=mirror0,fd=%d "
         "-object filter-mirror,id=qtest-f0,netdev=qtest-bn0,queue=tx,outdev=mirror0 "
-        , send_sock[1], devstr, sock_path);
-
-    recv_sock = unix_connect(sock_path, NULL);
-    g_assert_cmpint(recv_sock, !=, -1);
+        , send_sock[1], devstr, recv_sock[1]);
 
     struct iovec iov[] = {
         {
@@ -67,18 +63,20 @@ static void test_mirror(void)
     g_assert_cmpint(ret, ==, sizeof(send_buf) + sizeof(size));
     close(send_sock[0]);
 
-    ret = qemu_recv(recv_sock, &len, sizeof(len), 0);
+    ret = qemu_recv(recv_sock[0], &len, sizeof(len), 0);
     g_assert_cmpint(ret, ==, sizeof(len));
     len = ntohl(len);
 
     g_assert_cmpint(len, ==, sizeof(send_buf));
     recv_buf = g_malloc(len);
-    ret = qemu_recv(recv_sock, recv_buf, len, 0);
+    ret = qemu_recv(recv_sock[0], recv_buf, len, 0);
     g_assert_cmpstr(recv_buf, ==, send_buf);
 
     g_free(recv_buf);
-    close(recv_sock);
-    unlink(sock_path);
+    close(send_sock[0]);
+    close(send_sock[1]);
+    close(recv_sock[0]);
+    close(recv_sock[1]);
     qtest_quit(qts);
 }