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 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
56 ATF_REQUIRE(connect(c, (struct sockaddr *)&sin, sizeof(sin)) == 0);
57
58 s[0] = b;
59 s[1] = c;
60 }
61
62 /*
63 * Check MSG_TRUNC.
64 */
65 ATF_TC_WITHOUT_HEAD(trunc);
ATF_TC_BODY(trunc,tc)66 ATF_TC_BODY(trunc, tc)
67 {
68 char sbuf[] = "Hello, peer!", rbuf[sizeof(sbuf)];
69 struct iovec iov = {
70 .iov_base = sbuf,
71 .iov_len = sizeof(sbuf),
72 };
73 struct msghdr msg = {
74 .msg_iov = &iov,
75 .msg_iovlen = 1,
76 };
77 int s[2];
78 u_int n;
79
80 udp_socketpair(s);
81
82 ATF_REQUIRE(sendmsg(s[1], &msg, 0) == sizeof(sbuf));
83 n = (arc4random() % (sizeof(sbuf) - 1)) + 1;
84 iov.iov_base = rbuf;
85 iov.iov_len = n;
86 ATF_REQUIRE(recvmsg(s[0], &msg, 0) == (ssize_t)n);
87 ATF_REQUIRE(msg.msg_flags == MSG_TRUNC);
88 ATF_REQUIRE(strncmp(sbuf, rbuf, n) == 0);
89 iov.iov_len = sizeof(rbuf);
90 ATF_REQUIRE(recvmsg(s[0], &msg, MSG_DONTWAIT) == -1);
91 ATF_REQUIRE(errno == EAGAIN);
92
93 close(s[0]);
94 close(s[1]);
95 }
96
97 /*
98 * Check MSG_PEEK.
99 */
100 ATF_TC_WITHOUT_HEAD(peek);
ATF_TC_BODY(peek,tc)101 ATF_TC_BODY(peek, tc)
102 {
103 char sbuf[] = "Hello, peer!", rbuf[sizeof(sbuf)];
104 struct iovec iov = {
105 .iov_base = sbuf,
106 .iov_len = sizeof(sbuf),
107 };
108 struct msghdr msg = {
109 .msg_iov = &iov,
110 .msg_iovlen = 1,
111 };
112 int s[2];
113 u_int n;
114
115 udp_socketpair(s);
116
117 ATF_REQUIRE(sendmsg(s[1], &msg, 0) == sizeof(sbuf));
118 iov.iov_base = rbuf;
119 for (int i = 0; i < 10; i++) {
120 n = (arc4random() % sizeof(sbuf)) + 1;
121 iov.iov_len = n;
122 ATF_REQUIRE(recvmsg(s[0], &msg, MSG_PEEK) == (ssize_t)n);
123 if (n < sizeof(sbuf))
124 ATF_REQUIRE(msg.msg_flags == (MSG_PEEK | MSG_TRUNC));
125 else
126 ATF_REQUIRE(msg.msg_flags == MSG_PEEK);
127 ATF_REQUIRE(strncmp(sbuf, rbuf, n) == 0);
128 }
129
130 close(s[0]);
131 close(s[1]);
132 }
133
ATF_TP_ADD_TCS(tp)134 ATF_TP_ADD_TCS(tp)
135 {
136 ATF_TP_ADD_TC(tp, trunc);
137 ATF_TP_ADD_TC(tp, peek);
138
139 return (atf_no_error());
140 }
141