1 /*
2 * This file is part of net-yy-unix strace test.
3 *
4 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include "tests.h"
31 #include <assert.h>
32 #include <errno.h>
33 #include <stddef.h>
34 #include <stdint.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <sys/socket.h>
38 #include <sys/un.h>
39 #include "netlink.h"
40 #include <linux/sock_diag.h>
41 #include <linux/unix_diag.h>
42
43 static void
send_query(const int fd)44 send_query(const int fd)
45 {
46 struct sockaddr_nl nladdr = {
47 .nl_family = AF_NETLINK
48 };
49 struct {
50 struct nlmsghdr nlh;
51 struct unix_diag_req udr;
52 } req = {
53 .nlh = {
54 .nlmsg_len = sizeof(req),
55 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
56 .nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP
57 },
58 .udr = {
59 .sdiag_family = AF_UNIX,
60 .udiag_states = -1,
61 .udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
62 }
63 };
64 struct iovec iov = {
65 .iov_base = &req,
66 .iov_len = sizeof(req)
67 };
68 struct msghdr msg = {
69 .msg_name = (void *) &nladdr,
70 .msg_namelen = sizeof(nladdr),
71 .msg_iov = &iov,
72 .msg_iovlen = 1
73 };
74
75 if (sendmsg(fd, &msg, 0) <= 0)
76 perror_msg_and_skip("sendmsg");
77 }
78
79 static void
check_responses(const int fd)80 check_responses(const int fd)
81 {
82 static union {
83 struct nlmsghdr hdr;
84 long buf[8192 / sizeof(long)];
85 } hdr_buf;
86
87 struct sockaddr_nl nladdr = {
88 .nl_family = AF_NETLINK
89 };
90 struct iovec iov = {
91 .iov_base = hdr_buf.buf,
92 .iov_len = sizeof(hdr_buf.buf)
93 };
94 struct msghdr msg = {
95 .msg_name = (void *) &nladdr,
96 .msg_namelen = sizeof(nladdr),
97 .msg_iov = &iov,
98 .msg_iovlen = 1
99 };
100
101 ssize_t ret = recvmsg(fd, &msg, 0);
102 if (ret <= 0)
103 perror_msg_and_skip("recvmsg");
104
105 struct nlmsghdr *h = &hdr_buf.hdr;
106 if (!NLMSG_OK(h, ret))
107 error_msg_and_skip("!NLMSG_OK");
108 if (h->nlmsg_type == NLMSG_ERROR) {
109 const struct nlmsgerr *err = NLMSG_DATA(h);
110 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
111 error_msg_and_skip("NLMSG_ERROR");
112 errno = -err->error;
113 perror_msg_and_skip("NLMSG_ERROR");
114 }
115 if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
116 error_msg_and_skip("unexpected nlmsg_type %u",
117 (unsigned) h->nlmsg_type);
118
119 const struct unix_diag_msg *diag = NLMSG_DATA(h);
120 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
121 error_msg_and_skip("short response");
122 }
123
124 #define SUN_PATH "netlink_unix_diag_socket"
main(void)125 int main(void)
126 {
127 struct sockaddr_un addr = {
128 .sun_family = AF_UNIX,
129 .sun_path = SUN_PATH
130 };
131 socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
132
133 close(0);
134 close(1);
135
136 (void) unlink(SUN_PATH);
137 if (socket(AF_UNIX, SOCK_STREAM, 0))
138 perror_msg_and_skip("socket AF_UNIX");
139 if (bind(0, (struct sockaddr *) &addr, len))
140 perror_msg_and_skip("bind");
141 if (listen(0, 5))
142 perror_msg_and_skip("listen");
143
144 assert(unlink(SUN_PATH) == 0);
145
146 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
147 perror_msg_and_skip("socket AF_NETLINK");
148
149 send_query(1);
150 check_responses(1);
151 return 0;
152 }
153