1 /*
2 * This file is part of inet-yy 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 <errno.h>
32 #include <string.h>
33 #include <unistd.h>
34 #include <netinet/in.h>
35 #include "netlink.h"
36 #include <linux/sock_diag.h>
37 #include <linux/inet_diag.h>
38
39 static void
send_query(const int fd,const int family,const int proto)40 send_query(const int fd, const int family, const int proto)
41 {
42 struct sockaddr_nl nladdr = {
43 .nl_family = AF_NETLINK
44 };
45 struct {
46 struct nlmsghdr nlh;
47 struct inet_diag_req_v2 idr;
48 } req = {
49 .nlh = {
50 .nlmsg_len = sizeof(req),
51 .nlmsg_type = SOCK_DIAG_BY_FAMILY,
52 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
53 },
54 .idr = {
55 .sdiag_family = family,
56 .sdiag_protocol = proto,
57 .idiag_states = -1
58 }
59 };
60 struct iovec iov = {
61 .iov_base = &req,
62 .iov_len = sizeof(req)
63 };
64 struct msghdr msg = {
65 .msg_name = (void *) &nladdr,
66 .msg_namelen = sizeof(nladdr),
67 .msg_iov = &iov,
68 .msg_iovlen = 1
69 };
70
71 if (sendmsg(fd, &msg, 0) <= 0)
72 perror_msg_and_skip("sendmsg");
73 }
74
75 static void
check_responses(const int fd)76 check_responses(const int fd)
77 {
78 static union {
79 struct nlmsghdr hdr;
80 long buf[8192 / sizeof(long)];
81 } hdr_buf;
82
83 struct sockaddr_nl nladdr = {
84 .nl_family = AF_NETLINK
85 };
86 struct iovec iov = {
87 .iov_base = hdr_buf.buf,
88 .iov_len = sizeof(hdr_buf.buf)
89 };
90 struct msghdr msg = {
91 .msg_name = (void *) &nladdr,
92 .msg_namelen = sizeof(nladdr),
93 .msg_iov = &iov,
94 .msg_iovlen = 1
95 };
96
97 ssize_t ret = recvmsg(fd, &msg, 0);
98 if (ret <= 0)
99 perror_msg_and_skip("recvmsg");
100
101 struct nlmsghdr *h = &hdr_buf.hdr;
102 if (!NLMSG_OK(h, ret))
103 error_msg_and_skip("!NLMSG_OK");
104 if (h->nlmsg_type == NLMSG_ERROR) {
105 const struct nlmsgerr *err = NLMSG_DATA(h);
106 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*err)))
107 error_msg_and_skip("NLMSG_ERROR");
108 errno = -err->error;
109 perror_msg_and_skip("NLMSG_ERROR");
110 }
111 if (h->nlmsg_type != SOCK_DIAG_BY_FAMILY)
112 error_msg_and_skip("unexpected nlmsg_type %u",
113 (unsigned) h->nlmsg_type);
114
115 const struct inet_diag_msg *diag = NLMSG_DATA(h);
116 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(*diag)))
117 error_msg_and_skip("short response");
118 }
119
main(void)120 int main(void)
121 {
122 struct sockaddr_in addr;
123 socklen_t len = sizeof(addr);
124
125 memset(&addr, 0, sizeof(addr));
126 addr.sin_family = AF_INET;
127 addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
128
129 close(0);
130 close(1);
131
132 if (socket(AF_INET, SOCK_STREAM, 0))
133 perror_msg_and_skip("socket AF_INET");
134 if (bind(0, (struct sockaddr *) &addr, len))
135 perror_msg_and_skip("bind");
136 if (listen(0, 5))
137 perror_msg_and_skip("listen");
138 if (socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG) != 1)
139 perror_msg_and_skip("socket AF_NETLINK");
140
141 send_query(1, AF_INET, IPPROTO_TCP);
142 check_responses(1);
143 return 0;
144 }
145