1 /*
2 * This file is part of inet-yy strace test.
3 *
4 * Copyright (c) 2014-2016 Dmitry V. Levin <ldv@altlinux.org>
5 * Copyright (c) 2014-2018 The strace developers.
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 "netlink.h"
37 #include <linux/sock_diag.h>
38 #include <linux/inet_diag.h>
39
40 static void
send_query(const int fd,const int family,const int proto)41 send_query(const int fd, const int family, const int proto)
42 {
43 struct sockaddr_nl nladdr = {
44 .nl_family = AF_NETLINK
45 };
46 struct {
47 struct nlmsghdr nlh;
48 struct inet_diag_req_v2 idr;
49 } req = {
50 .nlh = {
51 .nlmsg_len = sizeof(req),
52 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
53 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
54 },
55 .idr = {
56 .sdiag_family = family,
57 .sdiag_protocol = proto,
58 .idiag_states = -1
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 inet_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_in addr;
124 socklen_t len = sizeof(addr);
125
126 memset(&addr, 0, sizeof(addr));
127 addr.sin_family = AF_INET;
128 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
129
130 close(0);
131 close(1);
132
133 if (socket(AF_INET, SOCK_STREAM, 0))
134 perror_msg_and_skip("socket AF_INET");
135 if (bind(0, (struct sockaddr *) &addr, len))
136 perror_msg_and_skip("bind");
137 if (listen(0, 5))
138 perror_msg_and_skip("listen");
139 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG) != 1)
140 perror_msg_and_skip("socket AF_NETLINK");
141
142 send_query(1, AF_INET, IPPROTO_TCP);
143 check_responses(1);
144 return 0;
145 }
146