1 /* 2 * Check decoding of recvmsg and sendmsg syscalls. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * Copyright (c) 2016-2017 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "tests.h" 32 33 #include <assert.h> 34 #include <stdio.h> 35 #include <unistd.h> 36 #include <sys/socket.h> 37 #include <sys/uio.h> 38 39 int 40 main(void) 41 { 42 tprintf("%s", ""); 43 44 int fds[2]; 45 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds)) 46 perror_msg_and_skip("socketpair"); 47 assert(0 == fds[0]); 48 assert(1 == fds[1]); 49 50 static const char w0_c[] = "012"; 51 const char *w0_d = hexdump_strdup(w0_c); 52 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c)); 53 54 static const char w1_c[] = "34567"; 55 const char *w1_d = hexdump_strdup(w1_c); 56 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c)); 57 58 static const char w2_c[] = "89abcde"; 59 const char *w2_d = hexdump_strdup(w2_c); 60 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c)); 61 62 static const char r0_c[] = "01234567"; 63 const char *r0_d = hexdump_strdup(r0_c); 64 static const char r1_c[] = "89abcde"; 65 const char *r1_d = hexdump_strdup(r1_c); 66 67 const struct iovec w_iov_[] = { 68 { 69 .iov_base = w0, 70 .iov_len = LENGTH_OF(w0_c) 71 }, { 72 .iov_base = w1, 73 .iov_len = LENGTH_OF(w1_c) 74 }, { 75 .iov_base = w2, 76 .iov_len = LENGTH_OF(w2_c) 77 } 78 }; 79 struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_)); 80 const unsigned int w_len = 81 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c); 82 83 const struct msghdr w_mh_ = { 84 .msg_iov = w_iov, 85 .msg_iovlen = ARRAY_SIZE(w_iov_) 86 }; 87 const struct msghdr *w_mh = tail_memdup(&w_mh_, sizeof(w_mh_)); 88 89 assert(sendmsg(1, w_mh, 0) == (int) w_len); 90 close(1); 91 tprintf("sendmsg(1, {msg_name=NULL, msg_namelen=0, msg_iov=" 92 "[{iov_base=\"%s\", iov_len=%u}, {iov_base=\"%s\", iov_len=%u}" 93 ", {iov_base=\"%s\", iov_len=%u}], msg_iovlen=%u" 94 ", msg_controllen=0, msg_flags=0}, 0) = %u\n" 95 " * %u bytes in buffer 0\n" 96 " | 00000 %-49s %-16s |\n" 97 " * %u bytes in buffer 1\n" 98 " | 00000 %-49s %-16s |\n" 99 " * %u bytes in buffer 2\n" 100 " | 00000 %-49s %-16s |\n", 101 w0_c, LENGTH_OF(w0_c), 102 w1_c, LENGTH_OF(w1_c), 103 w2_c, LENGTH_OF(w2_c), 104 (unsigned int) ARRAY_SIZE(w_iov_), w_len, 105 LENGTH_OF(w0_c), w0_d, w0_c, 106 LENGTH_OF(w1_c), w1_d, w1_c, 107 LENGTH_OF(w2_c), w2_d, w2_c); 108 109 const unsigned int r_len = (w_len + 1) / 2; 110 void *r0 = tail_alloc(r_len); 111 const struct iovec r0_iov_[] = { 112 { 113 .iov_base = r0, 114 .iov_len = r_len 115 } 116 }; 117 struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_)); 118 119 const struct msghdr r_mh_ = { 120 .msg_iov = r_iov, 121 .msg_iovlen = ARRAY_SIZE(r0_iov_) 122 }; 123 struct msghdr *r_mh = tail_memdup(&r_mh_, sizeof(r_mh_)); 124 125 assert(recvmsg(0, r_mh, 0) == (int) r_len); 126 tprintf("recvmsg(0, {msg_name=NULL, msg_namelen=0, msg_iov=" 127 "[{iov_base=\"%s\", iov_len=%u}], msg_iovlen=%u" 128 ", msg_controllen=0, msg_flags=0}, 0) = %u\n" 129 " * %u bytes in buffer 0\n" 130 " | 00000 %-49s %-16s |\n", 131 r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_), 132 r_len, r_len, r0_d, r0_c); 133 134 void *r1 = tail_alloc(r_len); 135 void *r2 = tail_alloc(w_len); 136 const struct iovec r1_iov_[] = { 137 { 138 .iov_base = r1, 139 .iov_len = r_len 140 }, 141 { 142 .iov_base = r2, 143 .iov_len = w_len 144 } 145 }; 146 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_)); 147 r_mh->msg_iov = r_iov; 148 r_mh->msg_iovlen = ARRAY_SIZE(r1_iov_); 149 150 assert(recvmsg(0, r_mh, 0) == (int) w_len - (int) r_len); 151 tprintf("recvmsg(0, {msg_name=NULL, msg_namelen=0, msg_iov=" 152 "[{iov_base=\"%s\", iov_len=%u}, {iov_base=\"\", iov_len=%u}]" 153 ", msg_iovlen=%u, msg_controllen=0, msg_flags=0}, 0) = %u\n" 154 " * %u bytes in buffer 0\n" 155 " | 00000 %-49s %-16s |\n", 156 r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_), 157 w_len - r_len, w_len - r_len, r1_d, r1_c); 158 close(0); 159 160 tprintf("+++ exited with 0 +++\n"); 161 return 0; 162 } 163
