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 * Copyright (c) 2016-2018 The strace developers.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include "tests.h"
33 #include <errno.h>
34 #include <string.h>
35 #include <unistd.h>
36 #include <netinet/in.h>
37 #include "netlink.h"
38 #include <linux/sock_diag.h>
39 #include <linux/netlink_diag.h>
40
41 static void
send_query(const int fd)42 send_query(const int fd)
43 {
44 struct sockaddr_nl nladdr = {
45 .nl_family = AF_NETLINK
46 };
47 struct {
48 struct nlmsghdr nlh;
49 struct netlink_diag_req ndr;
50 } req = {
51 .nlh = {
52 .nlmsg_len = sizeof(req),
53 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
54 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
55 },
56 .ndr = {
57 .sdiag_family = AF_NETLINK,
58 .sdiag_protocol = NDIAG_PROTO_ALL
59 }
60 };
61 struct iovec iov = {
62 .iov_base = &req,
63 .iov_len = sizeof(req)
64 };
65 struct msghdr msg = {
66 .msg_name = (void *) &nladdr,
67 .msg_namelen = sizeof(nladdr),
68 .msg_iov = &iov,
69 .msg_iovlen = 1
70 };
71
72 if (sendmsg(fd, &msg, 0) <= 0)
73 perror_msg_and_skip("sendmsg");
74 }
75
76 static void
check_responses(const int fd)77 check_responses(const int fd)
78 {
79 static union {
80 struct nlmsghdr hdr;
81 long buf[8192 / sizeof(long)];
82 } hdr_buf;
83
84 struct sockaddr_nl nladdr = {
85 .nl_family = AF_NETLINK
86 };
87 struct iovec iov = {
88 .iov_base = hdr_buf.buf,
89 .iov_len = sizeof(hdr_buf.buf)
90 };
91 struct msghdr msg = {
92 .msg_name = (void *) &nladdr,
93 .msg_namelen = sizeof(nladdr),
94 .msg_iov = &iov,
95 .msg_iovlen = 1
96 };
97
98 ssize_t ret = recvmsg(fd, &msg, 0);
99 if (ret <= 0)
100 perror_msg_and_skip("recvmsg");
101
102 struct nlmsghdr *h = &hdr_buf.hdr;
103 if (!is_nlmsg_ok(h, ret))
104 error_msg_and_skip("!is_nlmsg_ok");
105 if (h->nlmsg_type == NLMSG_ERROR) {
106 const struct nlmsgerr *err = NLMSG_DATA(h);
107 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
108 error_msg_and_skip("NLMSG_ERROR");
109 errno = -err->error;
110 perror_msg_and_skip("NLMSG_ERROR");
111 }
112 if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
113 error_msg_and_skip("unexpected nlmsg_type %u",
114 (unsigned) h->nlmsg_type);
115
116 const struct netlink_diag_msg *diag = NLMSG_DATA(h);
117 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
118 error_msg_and_skip("short response");
119 }
120
main(void)121 int main(void)
122 {
123 struct sockaddr_nl addr;
124 socklen_t len = sizeof(addr);
125
126 memset(&addr, 0, sizeof(addr));
127 addr.nl_family = AF_NETLINK;
128
129 close(0);
130 close(1);
131
132 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG))
133 perror_msg_and_skip("socket AF_NETLINK");
134 if (bind(0, (struct sockaddr *) &addr, len))
135 perror_msg_and_skip("bind");
136
137 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
138 perror_msg_and_skip("socket AF_NETLINK");
139
140 send_query(1);
141 check_responses(1);
142 return 0;
143 }
144