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
44 static void
send_query(const int fd)45 send_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
80 static void
check_responses(const int fd)81 check_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
main(void)125 int 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