[PATCH 4/4] tests: check decoding of nlmsgerr attributes

[JingPiao Chen]

* tests/nlattr_nlmsgerr.c: New file.
* tests/gen_tests.in (nlattr_nlmsgerr): New entry.
* tests/pure_executables.list: Add nlattr_nlmsgerr.
* tests/.gitignore: Likewise.
---
 tests/.gitignore            |  1 +
 tests/gen_tests.in          |  1 +
 tests/nlattr_nlmsgerr.c     | 89 +++++++++++++++++++++++++++++++++++++++++++++
 tests/pure_executables.list |  1 +
 4 files changed, 92 insertions(+)
 create mode 100644 tests/nlattr_nlmsgerr.c

diff --git a/tests/.gitignore b/tests/.gitignore
index 9bed8e8..a75de08 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -216,6 +216,7 @@ nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat
 nlattr_inet_diag_req_v2
 nlattr_netlink_diag_msg
+nlattr_nlmsgerr
 nlattr_packet_diag_msg
 nlattr_smc_diag_msg
 nlattr_unix_diag_msg
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 7ed08c5..4cea36b 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -199,6 +199,7 @@ nlattr_inet_diag_msg		+netlink_sock_diag.test
 nlattr_inet_diag_req_compat	+netlink_sock_diag.test
 nlattr_inet_diag_req_v2		+netlink_sock_diag.test
 nlattr_netlink_diag_msg		+netlink_sock_diag.test
+nlattr_nlmsgerr			+netlink_sock_diag.test
 nlattr_packet_diag_msg		+netlink_sock_diag-v.sh
 nlattr_smc_diag_msg		+netlink_sock_diag.test
 nlattr_unix_diag_msg		+netlink_sock_diag.test
diff --git a/tests/nlattr_nlmsgerr.c b/tests/nlattr_nlmsgerr.c
new file mode 100644
index 0000000..4ba1a7e
--- /dev/null
+++ b/tests/nlattr_nlmsgerr.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at 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 <stdint.h>
+#include "test_nlattr.h"
+
+#define NLMSGERR_ATTR_COOKIE 3
+
+static void
+init_nlmsgerr(struct nlmsghdr *const nlh, const unsigned int msg_len)
+{
+	SET_STRUCT(struct nlmsghdr, nlh,
+		.nlmsg_len = msg_len,
+		.nlmsg_type = NLMSG_ERROR,
+		.nlmsg_flags = NLM_F_REQUEST | NLM_F_CAPPED
+	);
+
+	struct nlmsgerr *const err = NLMSG_DATA(nlh);
+	SET_STRUCT(struct nlmsgerr, err,
+		.error = -13,
+		.msg = {
+			.nlmsg_len = NLMSG_HDRLEN + 4,
+			.nlmsg_type = NLMSG_NOOP,
+			.nlmsg_flags = NLM_F_REQUEST,
+		}
+	);
+}
+
+static void
+print_nlmsgerr(const unsigned int msg_len)
+{
+	printf("{len=%u, type=NLMSG_ERROR"
+	       ", flags=NLM_F_REQUEST|NLM_F_CAPPED"
+	       ", seq=0, pid=0}, {error=-EACCES"
+	       ", msg={len=%u, type=NLMSG_NOOP"
+	       ", flags=NLM_F_REQUEST, seq=0, pid=0}",
+	       msg_len, NLMSG_HDRLEN + 4);
+}
+
+int
+main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	const int fd = create_nl_socket(NETLINK_SOCK_DIAG);
+	const unsigned int hdrlen = sizeof(struct nlmsgerr);
+	void *const nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+
+	static char pattern[4096];
+	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
+
+	static const uint8_t cookie[] = { 0xab, 0xfe };
+	TEST_NLATTR(fd, nlh0, hdrlen,
+		    init_nlmsgerr, print_nlmsgerr,
+		    NLMSGERR_ATTR_COOKIE,
+		    sizeof(cookie), cookie, sizeof(cookie),
+		    printf("[%u, %u]", cookie[0], cookie[1]);
+		    printf("}"));
+
+	printf("+++ exited with 0 +++\n");
+	return 0;
+}
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 49200a5..a0e4dcf 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -181,6 +181,7 @@ nlattr_inet_diag_msg
 nlattr_inet_diag_req_compat
 nlattr_inet_diag_req_v2
 nlattr_netlink_diag_msg
+nlattr_nlmsgerr
 nlattr_packet_diag_msg
 nlattr_smc_diag_msg
 nlattr_unix_diag_msg
-- 
2.7.4