[PATCH RFC] tests: check decoding of libudev netlink header

[Harsha Sharma]

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

Signed-off-by: Harsha Sharma <harshasharmaiitr at gmail.com>
---
 tests/.gitignore                       |  1 +
 tests/gen_tests.in                     |  1 +
 tests/netlink_kobject_uevent_libudev.c | 88 ++++++++++++++++++++++++++++++++++
 tests/pure_executables.list            |  1 +
 4 files changed, 91 insertions(+)
 create mode 100644 tests/netlink_kobject_uevent_libudev.c

diff --git a/tests/.gitignore b/tests/.gitignore
index 2541ec24..623b98f8 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -215,6 +215,7 @@ netlink_crypto
 netlink_generic
 netlink_inet_diag
 netlink_kobject_uevent
+netlink_kobject_uevent_libudev
 netlink_netfilter
 netlink_netlink_diag
 netlink_protocol
diff --git a/tests/gen_tests.in b/tests/gen_tests.in
index 18f36408..263479a5 100644
--- a/tests/gen_tests.in
+++ b/tests/gen_tests.in
@@ -199,6 +199,7 @@ netlink_audit	+netlink_sock_diag.test
 netlink_crypto	+netlink_sock_diag.test
 netlink_generic	+netlink_sock_diag.test
 netlink_kobject_uevent	+netlink_sock_diag.test
+netlink_kobject_uevent_libudev  +netlink_sock_diag.test
 netlink_netfilter	+netlink_sock_diag.test
 netlink_protocol	-e trace=sendto
 netlink_route	+netlink_sock_diag.test
diff --git a/tests/netlink_kobject_uevent_libudev.c b/tests/netlink_kobject_uevent_libudev.c
new file mode 100644
index 00000000..8f0b2bfa
--- /dev/null
+++ b/tests/netlink_kobject_uevent_libudev.c
@@ -0,0 +1,88 @@
+/*
+ * 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 <string.h>
+#include <sys/socket.h>
+#include "netlink.h"
+#include "netlink_kobject_uevent.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+
+int
+main(void)
+{
+	skip_if_unavailable("/proc/self/fd/");
+
+	int fd, ret;
+	struct sockaddr_nl nls;
+	struct udev_monitor_netlink_header uh;
+
+	memset(&nls, 0, sizeof(nls));
+	nls.nl_family = AF_NETLINK;
+	nls.nl_pid = getpid();
+	nls.nl_groups = -1;
+
+	fd = socket(AF_NETLINK, (SOCK_DGRAM | SOCK_CLOEXEC),
+		    NETLINK_KOBJECT_UEVENT);
+	if (fd < 0)
+		perror_msg_and_skip("socket AF_NETLINK");
+
+	ret = bind(fd, (struct sockaddr *) &nls, sizeof(nls));
+	if (ret)
+		perror_msg_and_skip("bind AF_NETLINK");
+
+	printf("Waiting for events now...\n");
+	while (1) {
+		int r = recv(fd, &uh, sizeof(uh), MSG_ERRQUEUE);
+		if (r <= 0)
+			perror_msg_and_skip("recv");
+		if (!strcmp(uh.prefix, "libudev"))
+			printf("recvfrom(%i, {{prefix=\"%s\""
+			       ", magic=htonl(%#x), header_size=%u"
+			       ", properties_off=%u, properties_len=%u"
+			       ", filter_subsystem_hash=htonl(%#x)"
+			       ", filter_devtype_hash=htonl(%#x)"
+			       ", filter_tag_bloom_hi=htonl(%#x)"
+			       ", filter_tag_bloom_lo=htonl(%#x)}}, %li"
+			       ", MSG_ERRQUEUE, NULL, NULL)\n",
+			       fd, uh.prefix, ntohl(uh.magic), uh.header_size,
+			       uh.properties_off, uh.properties_len,
+			       ntohl(uh.filter_subsystem_hash),
+			       ntohl(uh.filter_devtype_hash),
+			       ntohl(uh.filter_tag_bloom_hi),
+			       ntohl(uh.filter_tag_bloom_lo), sizeof(uh));
+	}
+
+	close(fd);
+	puts("+++ exited with 0 +++");
+	return 0;
+}
diff --git a/tests/pure_executables.list b/tests/pure_executables.list
index 2f602a93..1ed40d1f 100755
--- a/tests/pure_executables.list
+++ b/tests/pure_executables.list
@@ -175,6 +175,7 @@ netlink_audit
 netlink_crypto
 netlink_generic
 netlink_kobject_uevent
+netlink_kobject_uevent_libudev
 netlink_netfilter
 netlink_protocol
 netlink_route
-- 
2.14.1