[PATCH 2/5] tests: check decoding of NETLINK_ROUTE messages first one byte

[JingPiao Chen]

* tests/netlink_route.c: Include <stdint.h>,
include "test_netlink.h" instead of "netlink.h".
(test_rtnl_unspec): New function.
(main): Use it.

Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
 tests/netlink_route.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/tests/netlink_route.c b/tests/netlink_route.c
index 54a54b7..537ab93 100644
--- a/tests/netlink_route.c
+++ b/tests/netlink_route.c
@@ -28,9 +28,10 @@
 #include "tests.h"
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h>
 #include <unistd.h>
 #include <sys/socket.h>
-#include "netlink.h"
+#include "test_netlink.h"
 #include <linux/rtnetlink.h>
 
 static void
@@ -92,6 +93,56 @@ test_nlmsg_flags(const int fd)
 	       (unsigned) sizeof(nlh), sprintrc(rc));
 }
 
+static void
+test_rtnl_unspec(const int fd)
+{
+	void *const nlh0 = tail_alloc(NLMSG_HDRLEN);
+
+	/* unspecified family only */
+	uint8_t family = 0;
+	TEST_NETLINK_(fd, nlh0,
+		      0xffff, "0xffff /* RTM_??? */",
+		      NLM_F_REQUEST, "NLM_F_REQUEST",
+		      sizeof(family), &family, sizeof(family),
+		      printf("{family=AF_UNSPEC}"));
+
+	/* unknown family only */
+	family = 0xff;
+	TEST_NETLINK_(fd, nlh0,
+		      0xffff, "0xffff /* RTM_??? */",
+		      NLM_F_REQUEST, "NLM_F_REQUEST",
+		      sizeof(family), &family, sizeof(family),
+		      printf("{family=0xff /* AF_??? */}"));
+
+	/* short read of family */
+	TEST_NETLINK_(fd, nlh0,
+		      0xffff, "0xffff /* RTM_??? */",
+		      NLM_F_REQUEST, "NLM_F_REQUEST",
+		      sizeof(family), &family, sizeof(family) - 1,
+		      printf("%p", NLMSG_DATA(TEST_NETLINK_nlh)));
+
+	/* unspecified family and string */
+	char buf[sizeof(family) + 4];
+	family = 0;
+	memcpy(buf, &family, sizeof(family));
+	memcpy(buf + sizeof(family), "1234", 4);
+	TEST_NETLINK_(fd, nlh0,
+		      0xffff, "0xffff /* RTM_??? */",
+		      NLM_F_REQUEST, "NLM_F_REQUEST",
+		      sizeof(buf), buf, sizeof(buf),
+		      printf("{family=AF_UNSPEC, \"\\x31\\x32\\x33\\x34\"}"));
+
+	/* unknown family and string */
+	family = 0xfd;
+	memcpy(buf, &family, sizeof(family));
+	TEST_NETLINK_(fd, nlh0,
+		      0xffff, "0xffff /* RTM_??? */",
+		      NLM_F_REQUEST, "NLM_F_REQUEST",
+		      sizeof(buf), buf, sizeof(buf),
+		      printf("{family=%#x /* AF_??? */"
+			     ", \"\\x31\\x32\\x33\\x34\"}", family));
+}
+
 int main(void)
 {
 	skip_if_unavailable("/proc/self/fd/");
@@ -100,6 +151,7 @@ int main(void)
 
 	test_nlmsg_type(fd);
 	test_nlmsg_flags(fd);
+	test_rtnl_unspec(fd);
 
 	printf("+++ exited with 0 +++\n");
 
-- 
2.7.4