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 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); 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); 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 } 133 134 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