tests: check decoding of NETLINK_ROUTE ifaddrmsg attributes

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

tests/.gitignore

@@ -218,6 +218,7 @@ netlink_xfrm
 newfstatat
 nlattr
 nlattr_crypto_user_alg
+nlattr_ifaddrmsg
 nlattr_ifinfomsg
 nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat

tests/gen_tests.in

@@ -198,6 +198,7 @@ netlink_xfrm	+netlink_sock_diag.test
 newfstatat	-a32 -v -P stat.sample -P /dev/full
 nlattr		+netlink_sock_diag.test
 nlattr_crypto_user_alg		+netlink_sock_diag.test
+nlattr_ifaddrmsg		+netlink_sock_diag.test
 nlattr_ifinfomsg		+netlink_sock_diag.test
 nlattr_inet_diag_msg		+netlink_sock_diag.test
 nlattr_inet_diag_req_compat	+netlink_sock_diag.test

tests/nlattr_ifaddrmsg.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
+ * Copyright (c) 2017 The strace developers.
+ * 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 "test_nlattr.h"
+#ifdef HAVE_LINUX_IF_ADDR_H
+# include <linux/if_addr.h>
+#endif
+#include <linux/rtnetlink.h>
+
+static void
+init_ifaddrmsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
+{
+	SET_STRUCT(struct nlmsghdr, nlh,
+		.nlmsg_len = msg_len,
+		.nlmsg_type = RTM_GETADDR,
+		.nlmsg_flags = NLM_F_DUMP
+	);
+
+	struct ifaddrmsg *const msg = NLMSG_DATA(nlh);
+	SET_STRUCT(struct ifaddrmsg, msg,
+		.ifa_family = AF_UNIX,
+		.ifa_flags = IFA_F_SECONDARY,
+		.ifa_scope = RT_SCOPE_UNIVERSE,
+		.ifa_index = ifindex_lo()
+	);
+}
+
+static void
+print_ifaddrmsg(const unsigned int msg_len)
+{
+	printf("{len=%u, type=RTM_GETADDR, flags=NLM_F_DUMP"
+	       ", seq=0, pid=0}, {ifa_family=AF_UNIX"
+	       ", ifa_prefixlen=0"
+	       ", ifa_flags=IFA_F_SECONDARY"
+	       ", ifa_scope=RT_SCOPE_UNIVERSE"
+	       ", ifa_index=" IFINDEX_LO_STR "}",
+	       msg_len);
+}
+
+int
+main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	const int fd = create_nl_socket(NETLINK_ROUTE);
+	const unsigned int hdrlen = sizeof(struct ifaddrmsg);
+	void *nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+
+	static char pattern[4096];
+	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
+
+	const unsigned int nla_type = 0xffff & NLA_TYPE_MASK;
+	char nla_type_str[256];
+	sprintf(nla_type_str, "%#x /* IFA_??? */", nla_type);
+	TEST_NLATTR_(fd, nlh0, hdrlen,
+		     init_ifaddrmsg, print_ifaddrmsg,
+		     nla_type, nla_type_str,
+		     4, pattern, 4,
+		     print_quoted_hex(pattern, 4));
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}

tests/pure_executables.list

@@ -181,6 +181,7 @@ netlink_xfrm
 newfstatat
 nlattr
 nlattr_crypto_user_alg
+nlattr_ifaddrmsg
 nlattr_ifinfomsg
 nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat