tests: check decoding of rtnetlink link messages

* tests/netlink_route.c: Include <linux/if_arp.h>.
(TEST_NL_ROUTE): New macro.
(test_rtnl_link): New function.
(main): Use it.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

diff --git a/tests/netlink_route.c b/tests/netlink_route.c
index c5b28faf63dd96b85c77ccd1462f4013c0128ace..2d8f0318dbe9260804f06173ee05e4971289d487 100644 (file)
--- a/tests/netlink_route.c
+++ b/tests/netlink_route.c
@@ -32,8 +32,43 @@
 #include <unistd.h>
 #include <sys/socket.h>
 #include "test_netlink.h"
+#include <linux/if_arp.h>
 #include <linux/rtnetlink.h>
 
+#ifdef HAVE_IF_INDEXTONAME
+/* <linux/if.h> used to conflict with <net/if.h> */
+extern unsigned int if_nametoindex(const char *);
+# define IFINDEX_LO    (if_nametoindex("lo"))
+#else
+# define IFINDEX_LO    1
+#endif
+
+#define TEST_NL_ROUTE(fd_, nlh0_, type_, obj_, print_family_, ...)     \
+       do {                                                            \
+               /* family and string */                                 \
+               TEST_NETLINK((fd_), (nlh0_),                            \
+                            type_, NLM_F_REQUEST,                      \
+                            sizeof(obj_) - 1,                          \
+                            &(obj_), sizeof(obj_) - 1,                 \
+                            (print_family_);                           \
+                            printf(", ...}"));                         \
+                                                                       \
+               /* sizeof(obj_) */                                      \
+               TEST_NETLINK((fd_), (nlh0_),                            \
+                            type_, NLM_F_REQUEST,                      \
+                            sizeof(obj_), &(obj_), sizeof(obj_),       \
+                            (print_family_);                           \
+                             __VA_ARGS__);                             \
+                                                                       \
+               /* short read of sizeof(obj_) */                        \
+               TEST_NETLINK((fd_), (nlh0_),                            \
+                            type_, NLM_F_REQUEST,                      \
+                            sizeof(obj_), &(obj_), sizeof(obj_) - 1,   \
+                            (print_family_);                           \
+                            printf(", %p}",                            \
+                                   NLMSG_DATA(TEST_NETLINK_nlh) + 1)); \
+       } while (0)
+
 static void
 test_nlmsg_type(const int fd)
 {
@@ -143,6 +178,27 @@ test_rtnl_unspec(const int fd)
                             ", \"\\x31\\x32\\x33\\x34\"}", family));
 }
 
+static void
+test_rtnl_link(const int fd)
+{
+       void *const nlh0 = tail_alloc(NLMSG_HDRLEN);
+       const struct ifinfomsg ifinfo = {
+               .ifi_family = AF_UNIX,
+               .ifi_type = ARPHRD_LOOPBACK,
+               .ifi_index = IFINDEX_LO,
+               .ifi_flags = IFF_UP,
+               .ifi_change = 0xfabcdeba
+       };
+
+       TEST_NL_ROUTE(fd, nlh0, RTM_GETLINK, ifinfo,
+                     printf("{ifi_family=AF_UNIX"),
+                     printf(", ifi_type=ARPHRD_LOOPBACK"
+                            ", ifi_index=if_nametoindex(\"lo\")"
+                            ", ifi_flags=IFF_UP");
+                     PRINT_FIELD_X(", ", ifinfo, ifi_change);
+                     printf("}"));
+}
+
 int main(void)
 {
        skip_if_unavailable("/proc/self/fd/");
@@ -152,6 +208,7 @@ int main(void)
        test_nlmsg_type(fd);
        test_nlmsg_flags(fd);
        test_rtnl_unspec(fd);
+       test_rtnl_link(fd);
 
        printf("+++ exited with 0 +++\n");