tests: check decoding of NETLINK_SELINUX message types

* tests/netlink_selinux.c: New file.
* tests/gen_tests.in (netlink_selinux): New entry.
* tests/pure_executables.list: Add netlink_selinux.
* tests/.gitignore: Likewise.

tests/.gitignore

@@ -203,6 +203,7 @@ netlink_netfilter
 netlink_netlink_diag
 netlink_protocol
 netlink_route
+netlink_selinux
 netlink_sock_diag
 netlink_unix_diag
 newfstatat

tests/gen_tests.in

@@ -188,6 +188,7 @@ netlink_audit	+netlink_sock_diag.test
 netlink_netfilter	+netlink_sock_diag.test
 netlink_protocol	-e trace=sendto
 netlink_route	+netlink_sock_diag.test
+netlink_selinux	+netlink_sock_diag.test
 newfstatat	-a32 -v -P stat.sample -P /dev/full
 old_mmap	-a11 -e trace=mmap
 oldfstat	-a18 -v -P stat.sample

tests/netlink_selinux.c

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/selinux_netlink.h>
+
+static void
+test_nlmsg_type(const int fd)
+{
+	long rc;
+	struct nlmsghdr nlh = {
+		.nlmsg_len = sizeof(nlh),
+		.nlmsg_type = SELNL_MSG_SETENFORCE,
+		.nlmsg_flags = NLM_F_REQUEST,
+	};
+
+	rc = sendto(fd, &nlh, sizeof(nlh), MSG_DONTWAIT, NULL, 0);
+	printf("sendto(%d, {{len=%u, type=SELNL_MSG_SETENFORCE"
+	       ", flags=NLM_F_REQUEST, seq=0, pid=0}}"
+	       ", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, nlh.nlmsg_len, (unsigned) sizeof(nlh), sprintrc(rc));
+}
+
+int main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	int fd = create_nl_socket(NETLINK_SELINUX);
+
+	test_nlmsg_type(fd);
+
+	printf("+++ exited with 0 +++\n");
+
+	return 0;
+}

tests/pure_executables.list

@@ -169,6 +169,7 @@ netlink_audit
 netlink_netfilter
 netlink_protocol
 netlink_route
+netlink_selinux
 netlink_sock_diag
 newfstatat
 old_mmap