[PATCH v4 5/5] tests: add check for decoding family name of netlink GENERIC protocol

[Masatake YAMATO]

* tests/netlink_generic.c: New file.
* tests/gen_tests.in: Add netlink_generic.
* pure_executables.list: Likewise.
* tests/.gitignore: Add netlink_generic.

Changes in v4 (suggested by ldv):

	* Allow to skip the test case when HAVE_LINUX_GENETLINK_H is
	  not defined.
	* Don't specify NUM_F_ACK.

Signed-off-by: Masatake YAMATO <yamato at redhat.com>
---
 tests/.gitignore            |  1 +
 tests/gen_tests.in          |  1 +
 tests/netlink_generic.c     | 89 +++++++++++++++++++++++++++++++++++++++++++++
 tests/pure_executables.list |  1 +
 4 files changed, 92 insertions(+)
 create mode 100644 tests/netlink_generic.c

diff --git a/tests/.gitignore b/tests/.gitignore
index de9fccd..bed18d3 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -198,6 +198,7 @@ net-yy-inet
 net-yy-netlink
 net-yy-unix
 netlink_audit
+netlink_generic
 netlink_inet_diag
 netlink_netfilter
 netlink_netlink_diag
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 24a0bfa..d75fd4d 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -185,6 +185,7 @@ nanosleep	-a20
 net-icmp_filter	-e trace=getsockopt,setsockopt
 net-sockaddr	-a24 -e trace=connect
 netlink_audit	+netlink_sock_diag.test
+netlink_generic	+netlink_sock_diag.test
 netlink_netfilter	+netlink_sock_diag.test
 netlink_protocol	-e trace=sendto
 netlink_route	+netlink_sock_diag.test
diff --git a/tests/netlink_generic.c b/tests/netlink_generic.c
new file mode 100644
index 0000000..99deb7d
--- /dev/null
+++ b/tests/netlink_generic.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2017 The strace developers.
+ *
+ * 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.
+ */
+
+/* This test case is based on netlink_selinux.c */
+
+#include "tests.h"
+
+#if HAVE_LINUX_GENETLINK_H
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <linux/netlink.h>
+#include <linux/genetlink.h>
+
+static void
+test_nlmsg_type(const int fd)
+{
+	/* Though GENL_ID_CTRL is statically given in this test case,
+	 * strace doesn't have knowledge that the human readable name
+	 * for GENL_ID_CTRL is "nlctrl". This case tests strace can
+	 * resolve GENL_ID_CTRL as "nlctrl" from the information getting
+	 * from run-time environment.
+	 */
+	long rc;
+	struct {
+		const struct nlmsghdr nlh;
+		struct genlmsghdr gnlh;
+	} req = {
+		.nlh = {
+			.nlmsg_len = sizeof(req),
+			.nlmsg_type = GENL_ID_CTRL,
+			.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST,
+		},
+		.gnlh = {
+			.cmd = CTRL_CMD_GETFAMILY,
+		}
+	};
+
+	rc = sendto(fd, &req, sizeof(req), MSG_DONTWAIT, NULL, 0);
+	printf("sendto(%d, {{len=%u, type=nlctrl, "
+	       "flags=NLM_F_REQUEST|0x300, seq=0, pid=0}, "
+	       "\"\\3\\0\\0\\0\"}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
+	       fd, req.nlh.nlmsg_len,
+	       (unsigned int) sizeof(req), sprintrc(rc));
+}
+
+int main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	int fd = create_nl_socket(NETLINK_GENERIC);
+
+	test_nlmsg_type(fd);
+
+	printf("+++ exited with 0 +++\n");
+
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("HAVE_LINUX_GENETLINK_H")
+
+#endif
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 1e0a569..ff49833 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -166,6 +166,7 @@ net-yy-inet
 net-yy-netlink
 net-yy-unix
 netlink_audit
+netlink_generic
 netlink_netfilter
 netlink_protocol
 netlink_route
-- 
2.9.4