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 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); 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); 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 } 132 133 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