1/*
2 * This file is part of net-yy-netlink strace test.
3 *
4 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "tests.h"
32#include <errno.h>
33#include <string.h>
34#include <unistd.h>
35#include <netinet/in.h>
36#include <linux/netlink.h>
37#include <linux/sock_diag.h>
38#include <linux/netlink_diag.h>
39
40#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
41# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
42#endif
43
44static void
45send_query(const int fd)
46{
47	struct sockaddr_nl nladdr = {
48		.nl_family = AF_NETLINK
49	};
50	struct {
51		struct nlmsghdr nlh;
52		struct netlink_diag_req ndr;
53	} req = {
54		.nlh = {
55			.nlmsg_len = sizeof(req),
56			.nlmsg_type = SOCK_DIAG_BY_FAMILY,
57			.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
58		},
59		.ndr = {
60			.sdiag_family = AF_NETLINK,
61			.sdiag_protocol = NDIAG_PROTO_ALL,
62			.ndiag_show = NDIAG_SHOW_MEMINFO
63		}
64	};
65	struct iovec iov = {
66		.iov_base = &req,
67		.iov_len = sizeof(req)
68	};
69	struct msghdr msg = {
70		.msg_name = (void *) &nladdr,
71		.msg_namelen = sizeof(nladdr),
72		.msg_iov = &iov,
73		.msg_iovlen = 1
74	};
75
76	if (sendmsg(fd, &msg, 0) <= 0)
77		perror_msg_and_skip("sendmsg");
78}
79
80static void
81check_responses(const int fd)
82{
83	static union {
84		struct nlmsghdr hdr;
85		long buf[8192 / sizeof(long)];
86	} hdr_buf;
87
88	struct sockaddr_nl nladdr = {
89		.nl_family = AF_NETLINK
90	};
91	struct iovec iov = {
92		.iov_base = hdr_buf.buf,
93		.iov_len = sizeof(hdr_buf.buf)
94	};
95	struct msghdr msg = {
96		.msg_name = (void *) &nladdr,
97		.msg_namelen = sizeof(nladdr),
98		.msg_iov = &iov,
99		.msg_iovlen = 1
100	};
101
102	ssize_t ret = recvmsg(fd, &msg, 0);
103	if (ret <= 0)
104		perror_msg_and_skip("recvmsg");
105
106	struct nlmsghdr *h = &hdr_buf.hdr;
107	if (!NLMSG_OK(h, ret))
108		error_msg_and_skip("!NLMSG_OK");
109	if (h->nlmsg_type == NLMSG_ERROR) {
110		const struct nlmsgerr *err = NLMSG_DATA(h);
111		if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
112			error_msg_and_skip("NLMSG_ERROR");
113		errno = -err->error;
114		perror_msg_and_skip("NLMSG_ERROR");
115	}
116	if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
117		error_msg_and_skip("unexpected nlmsg_type %u",
118				   (unsigned) h->nlmsg_type);
119
120	const struct netlink_diag_msg *diag = NLMSG_DATA(h);
121	if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
122		error_msg_and_skip("short response");
123}
124
125int main(void)
126{
127	struct sockaddr_nl addr;
128	socklen_t len = sizeof(addr);
129
130	memset(&addr, 0, sizeof(addr));
131	addr.nl_family = AF_NETLINK;
132
133	close(0);
134	close(1);
135
136	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG))
137		perror_msg_and_skip("socket AF_NETLINK");
138	if (bind(0, (struct sockaddr *) &addr, len))
139		perror_msg_and_skip("bind");
140
141	if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
142		perror_msg_and_skip("socket AF_NETLINK");
143
144	send_query(1);
145	check_responses(1);
146	return 0;
147}
148