1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2023 Gleb Smirnoff <glebius@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/socket.h>
29#include <netinet/in.h>
30#include <errno.h>
31#include <fcntl.h>
32#include <string.h>
33
34#include <atf-c.h>
35
36static int
37tcp4_listensock(struct sockaddr_in *sin)
38{
39	int l;
40
41	ATF_REQUIRE((l = socket(PF_INET, SOCK_STREAM, 0)) > 0);
42	ATF_REQUIRE(setsockopt(l, SOL_SOCKET, SO_REUSEADDR, &(socklen_t){1},
43	    sizeof(int)) == 0);
44	*sin = (struct sockaddr_in){
45		.sin_len = sizeof(sin),
46		.sin_family = AF_INET,
47		.sin_addr.s_addr = htonl(INADDR_LOOPBACK),
48	};
49	ATF_REQUIRE(bind(l, (struct sockaddr *)sin, sizeof(*sin)) == 0);
50	ATF_REQUIRE(getsockname(l, (struct sockaddr *)sin,
51	    &(socklen_t){ sizeof(*sin) }) == 0);
52	ATF_REQUIRE(listen(l, -1) == 0);
53
54	return (l);
55}
56
57static int
58tcp4_clientsock(struct sockaddr_in *sin)
59{
60	int s;
61
62	ATF_REQUIRE((s = socket(PF_INET, SOCK_STREAM, 0)) > 0);
63	ATF_REQUIRE(connect(s, (struct sockaddr *)sin, sizeof(*sin)) == 0);
64
65	return (s);
66}
67
68ATF_TC_WITHOUT_HEAD(tcp4_zerolen);
69ATF_TC_BODY(tcp4_zerolen, tc)
70{
71	static char canary[sizeof(struct sockaddr_in)] =
72	    { [0 ... sizeof(struct sockaddr_in) - 1] = 0xa };
73	struct sockaddr_in sin, ret;
74	socklen_t salen;
75	int l;
76
77	l = tcp4_listensock(&sin);
78	(void )tcp4_clientsock(&sin);
79
80	memcpy(&ret, &canary, sizeof(ret));
81	salen = 0;
82	ATF_REQUIRE(accept(l, (struct sockaddr *)&ret, &salen) > 0);
83	ATF_REQUIRE(memcmp(&ret, &canary, sizeof(ret)) == 0);
84	ATF_REQUIRE(salen == sizeof(struct sockaddr_in));
85	/* Note: Linux will block for connection here, we fail immediately. */
86	ATF_REQUIRE(accept(l, (struct sockaddr *)&ret, NULL) == -1);
87	ATF_REQUIRE(errno == EFAULT);
88}
89
90ATF_TC_WITHOUT_HEAD(tcp4);
91ATF_TC_BODY(tcp4, tc)
92{
93	struct sockaddr_in sin, ret;
94	socklen_t salen;
95	int l, s;
96
97	l = tcp4_listensock(&sin);
98	s = tcp4_clientsock(&sin);
99
100	salen = sizeof(struct sockaddr_in) + 2;
101	ATF_REQUIRE(accept(l, (struct sockaddr *)&ret, &salen) > 0);
102	ATF_REQUIRE(salen == sizeof(struct sockaddr_in));
103	ATF_REQUIRE(getsockname(s, (struct sockaddr *)&sin,
104	    &(socklen_t){ sizeof(sin) }) == 0);
105	ATF_REQUIRE(memcmp(&ret, &sin, sizeof(sin)) == 0);
106}
107
108ATF_TC_WITHOUT_HEAD(tcp4_noaddr);
109ATF_TC_BODY(tcp4_noaddr, tc)
110{
111	struct sockaddr_in sin;
112	int l;
113
114	l = tcp4_listensock(&sin);
115	(void )tcp4_clientsock(&sin);
116
117	ATF_REQUIRE(accept(l, NULL, NULL) > 0);
118}
119
120ATF_TP_ADD_TCS(tp)
121{
122	ATF_TP_ADD_TC(tp, tcp4);
123	ATF_TP_ADD_TC(tp, tcp4_noaddr);
124	ATF_TP_ADD_TC(tp, tcp4_zerolen);
125
126	return (atf_no_error());
127}
128