[PATCH 21/27] tests: check decoding of NETLINK_ROUTE tcmsg netlink attribute

[JingPiao Chen]

* tests/nlattr_tcmsg.c: New file.
* tests/gen_tests.in (nlattr_tcmsg): New entry.
* tests/pure_executables.list: Add nlattr_tcmsg.
* tests/.gitignore: Likewise.
---
 tests/.gitignore            |  1 +
 tests/gen_tests.in          |  1 +
 tests/nlattr_tcmsg.c        | 94 +++++++++++++++++++++++++++++++++++++++++++++
 tests/pure_executables.list |  1 +
 4 files changed, 97 insertions(+)
 create mode 100644 tests/nlattr_tcmsg.c

diff --git a/tests/.gitignore b/tests/.gitignore
index b460533..c5e14f8 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -231,6 +231,7 @@ nlattr_nlmsgerr
 nlattr_packet_diag_msg
 nlattr_rtmsg
 nlattr_smc_diag_msg
+nlattr_tcmsg
 nlattr_unix_diag_msg
 nsyscalls
 old_mmap
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 850f0e0..d6ba51a 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -211,6 +211,7 @@ nlattr_nlmsgerr			+netlink_sock_diag.test
 nlattr_packet_diag_msg		+netlink_sock_diag-v.sh
 nlattr_rtmsg			+netlink_sock_diag.test
 nlattr_smc_diag_msg		+netlink_sock_diag.test
+nlattr_tcmsg			+netlink_sock_diag.test
 nlattr_unix_diag_msg		+netlink_sock_diag.test
 old_mmap	-a11 -e trace=mmap
 oldfstat	-a18 -v -P stat.sample
diff --git a/tests/nlattr_tcmsg.c b/tests/nlattr_tcmsg.c
new file mode 100644
index 0000000..ba5cdc6
--- /dev/null
+++ b/tests/nlattr_tcmsg.c
@@ -0,0 +1,94 @@
+/*
+ * 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 <sys/socket.h>
+#include "test_nlattr.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
+
+static void
+init_tcmsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
+{
+	SET_STRUCT(struct nlmsghdr, nlh,
+		.nlmsg_len = msg_len,
+		.nlmsg_type = RTM_GETQDISC,
+		.nlmsg_flags = NLM_F_DUMP
+	);
+
+	struct tcmsg *const msg = NLMSG_DATA(nlh);
+	SET_STRUCT(struct tcmsg, msg,
+		.tcm_family = AF_UNIX,
+		.tcm_ifindex = IFINDEX_LO
+	);
+
+}
+
+static void
+print_tcmsg(const unsigned int msg_len)
+{
+	printf("{len=%u, type=RTM_GETQDISC, flags=NLM_F_DUMP"
+	       ", seq=0, pid=0}, {tcm_family=AF_UNIX"
+	       ", tcm_ifindex=if_nametoindex(\"lo\")"
+	       ", tcm_handle=0, tcm_parent=0, tcm_info=0}",
+	       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 tcmsg);
+	void *nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));
+
+	static char pattern[4096];
+	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);
+
+	char nla_type_str[256];
+	sprintf(nla_type_str, "%#x /* TCA_??? */", 0xffff & NLA_TYPE_MASK);
+	TEST_NLATTR_(fd, nlh0, hdrlen,
+		     init_tcmsg, print_tcmsg,
+		     0xffff & NLA_TYPE_MASK, nla_type_str,
+		     4, pattern, 4,
+		     print_quoted_hex(pattern, 4));
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 69c8c48..dbac011 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -194,6 +194,7 @@ nlattr_nlmsgerr
 nlattr_packet_diag_msg
 nlattr_rtmsg
 nlattr_smc_diag_msg
+nlattr_tcmsg
 nlattr_unix_diag_msg
 old_mmap
 oldfstat
-- 
2.7.4