1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2024 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 <stdlib.h>
32 #include <string.h>
33 #include <unistd.h>
34
35 #include <atf-c.h>
36
37 /*
38 * Create a pair of UDP sockets. The first one is bound to a local
39 * address and the second one is connected to it.
40 */
41 static void
udp_socketpair(int * s)42 udp_socketpair(int *s)
43 {
44 struct sockaddr_in sin = {
45 .sin_family = AF_INET,
46 .sin_len = sizeof(sin),
47 };
48 socklen_t slen = sizeof(sin);
49 int b, c;
50
51 ATF_REQUIRE((b = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
52 ATF_REQUIRE((c = socket(PF_INET, SOCK_DGRAM, 0)) > 0);
53 ATF_REQUIRE(bind(b, (struct sockaddr *)&sin, sizeof(sin)) == 0);
54 ATF_REQUIRE(getsockname(b, (struct sockaddr *)&sin, &slen) == 0);
55 ATF_REQUIRE(connect(c, (struct sockaddr *)&sin, sizeof(sin)) == 0);
56
57 s[0] = b;
58 s[1] = c;
59 }
60
61 /*
62 * Check MSG_TRUNC.
63 */
64 ATF_TC_WITHOUT_HEAD(trunc);
ATF_TC_BODY(trunc,tc)65 ATF_TC_BODY(trunc, tc)
66 {
67 char sbuf[] = "Hello, peer!", rbuf[sizeof(sbuf)];
68 struct iovec iov = {
69 .iov_base = sbuf,
70 .iov_len = sizeof(sbuf),
71 };
72 struct msghdr msg = {
73 .msg_iov = &iov,
74 .msg_iovlen = 1,
75 };
76 int s[2];
77 u_int n;
78
79 udp_socketpair(s);
80
81 ATF_REQUIRE(sendmsg(s[1], &msg, 0) == sizeof(sbuf));
82 n = (arc4random() % (sizeof(sbuf) - 1)) + 1;
83 iov.iov_base = rbuf;
84 iov.iov_len = n;
85 ATF_REQUIRE(recvmsg(s[0], &msg, 0) == (ssize_t)n);
86 ATF_REQUIRE(msg.msg_flags == MSG_TRUNC);
87 ATF_REQUIRE(strncmp(sbuf, rbuf, n) == 0);
88 iov.iov_len = sizeof(rbuf);
89 ATF_REQUIRE(recvmsg(s[0], &msg, MSG_DONTWAIT) == -1);
90 ATF_REQUIRE(errno == EAGAIN);
91
92 close(s[0]);
93 close(s[1]);
94 }
95
96 /*
97 * Check MSG_PEEK.
98 */
99 ATF_TC_WITHOUT_HEAD(peek);
ATF_TC_BODY(peek,tc)100 ATF_TC_BODY(peek, tc)
101 {
102 char sbuf[] = "Hello, peer!", rbuf[sizeof(sbuf)];
103 struct iovec iov = {
104 .iov_base = sbuf,
105 .iov_len = sizeof(sbuf),
106 };
107 struct msghdr msg = {
108 .msg_iov = &iov,
109 .msg_iovlen = 1,
110 };
111 int s[2];
112 u_int n;
113
114 udp_socketpair(s);
115
116 ATF_REQUIRE(sendmsg(s[1], &msg, 0) == sizeof(sbuf));
117 iov.iov_base = rbuf;
118 for (int i = 0; i < 10; i++) {
119 n = (arc4random() % sizeof(sbuf)) + 1;
120 iov.iov_len = n;
121 ATF_REQUIRE(recvmsg(s[0], &msg, MSG_PEEK) == (ssize_t)n);
122 if (n < sizeof(sbuf))
123 ATF_REQUIRE(msg.msg_flags == (MSG_PEEK | MSG_TRUNC));
124 else
125 ATF_REQUIRE(msg.msg_flags == MSG_PEEK);
126 ATF_REQUIRE(strncmp(sbuf, rbuf, n) == 0);
127 }
128
129 close(s[0]);
130 close(s[1]);
131 }
132
ATF_TP_ADD_TCS(tp)133 ATF_TP_ADD_TCS(tp)
134 {
135 ATF_TP_ADD_TC(tp, trunc);
136 ATF_TP_ADD_TC(tp, peek);
137
138 return (atf_no_error());
139 }
140