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