1 /*
2 * Check decoding of recvmsg and sendmsg syscalls.
3 *
4 * Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
5 * Copyright (c) 2016-2021 The strace developers.
6 * All rights reserved.
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include "tests.h"
12
13 #include <assert.h>
14 #include <stdio.h>
15 #include <unistd.h>
16 #include <sys/socket.h>
17 #include <sys/uio.h>
18
19 int
20 main(void)
21 {
22 tprintf("%s", "");
23
24 int fds[2];
25 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds))
26 perror_msg_and_skip("socketpair");
27 assert(0 == fds[0]);
28 assert(1 == fds[1]);
29
30 static const char w0_c[] = "012";
31 const char *w0_d = hexdump_strdup(w0_c);
32 void *w0 = tail_memdup(w0_c, LENGTH_OF(w0_c));
33
34 static const char w1_c[] = "34567";
35 const char *w1_d = hexdump_strdup(w1_c);
36 void *w1 = tail_memdup(w1_c, LENGTH_OF(w1_c));
37
38 static const char w2_c[] = "89abcde";
39 const char *w2_d = hexdump_strdup(w2_c);
40 void *w2 = tail_memdup(w2_c, LENGTH_OF(w2_c));
41
42 static const char r0_c[] = "01234567";
43 const char *r0_d = hexdump_strdup(r0_c);
44 static const char r1_c[] = "89abcde";
45 const char *r1_d = hexdump_strdup(r1_c);
46
47 const struct iovec w_iov_[] = {
48 {
49 .iov_base = w0,
50 .iov_len = LENGTH_OF(w0_c)
51 }, {
52 .iov_base = w1,
53 .iov_len = LENGTH_OF(w1_c)
54 }, {
55 .iov_base = w2,
56 .iov_len = LENGTH_OF(w2_c)
57 }
58 };
59 struct iovec *w_iov = tail_memdup(w_iov_, sizeof(w_iov_));
60 const unsigned int w_len =
61 LENGTH_OF(w0_c) + LENGTH_OF(w1_c) + LENGTH_OF(w2_c);
62
63 const struct msghdr w_mh_ = {
64 .msg_iov = w_iov,
65 .msg_iovlen = ARRAY_SIZE(w_iov_)
66 };
67 const struct msghdr *w_mh = tail_memdup(&w_mh_, sizeof(w_mh_));
68
69 assert(sendmsg(1, w_mh, 0) == (int) w_len);
70 close(1);
71 tprintf("sendmsg(1, {msg_name=NULL, msg_namelen=0, msg_iov="
72 "[{iov_base=\"%s\", iov_len=%u}, {iov_base=\"%s\", iov_len=%u}"
73 ", {iov_base=\"%s\", iov_len=%u}], msg_iovlen=%u"
74 ", msg_controllen=0, msg_flags=0}, 0) = %u\n"
75 " * %u bytes in buffer 0\n"
76 " | 00000 %-49s %-16s |\n"
77 " * %u bytes in buffer 1\n"
78 " | 00000 %-49s %-16s |\n"
79 " * %u bytes in buffer 2\n"
80 " | 00000 %-49s %-16s |\n",
81 w0_c, LENGTH_OF(w0_c),
82 w1_c, LENGTH_OF(w1_c),
83 w2_c, LENGTH_OF(w2_c),
84 (unsigned int) ARRAY_SIZE(w_iov_), w_len,
85 LENGTH_OF(w0_c), w0_d, w0_c,
86 LENGTH_OF(w1_c), w1_d, w1_c,
87 LENGTH_OF(w2_c), w2_d, w2_c);
88
89 const unsigned int r_len = (w_len + 1) / 2;
90 void *r0 = tail_alloc(r_len);
91 const struct iovec r0_iov_[] = {
92 {
93 .iov_base = r0,
94 .iov_len = r_len
95 }
96 };
97 struct iovec *r_iov = tail_memdup(r0_iov_, sizeof(r0_iov_));
98
99 const struct msghdr r_mh_ = {
100 .msg_iov = r_iov,
101 .msg_iovlen = ARRAY_SIZE(r0_iov_)
102 };
103 struct msghdr *r_mh = tail_memdup(&r_mh_, sizeof(r_mh_));
104
105 assert(recvmsg(0, r_mh, 0) == (int) r_len);
106 tprintf("recvmsg(0, {msg_name=NULL, msg_namelen=0, msg_iov="
107 "[{iov_base=\"%s\", iov_len=%u}], msg_iovlen=%u"
108 ", msg_controllen=0, msg_flags=0}, 0) = %u\n"
109 " * %u bytes in buffer 0\n"
110 " | 00000 %-49s %-16s |\n",
111 r0_c, r_len, (unsigned int) ARRAY_SIZE(r0_iov_),
112 r_len, r_len, r0_d, r0_c);
113
114 void *r1 = tail_alloc(r_len);
115 void *r2 = tail_alloc(w_len);
116 const struct iovec r1_iov_[] = {
117 {
118 .iov_base = r1,
119 .iov_len = r_len
120 },
121 {
122 .iov_base = r2,
123 .iov_len = w_len
124 }
125 };
126 r_iov = tail_memdup(r1_iov_, sizeof(r1_iov_));
127 r_mh->msg_iov = r_iov;
128 r_mh->msg_iovlen = ARRAY_SIZE(r1_iov_);
129
130 assert(recvmsg(0, r_mh, 0) == (int) w_len - (int) r_len);
131 tprintf("recvmsg(0, {msg_name=NULL, msg_namelen=0, msg_iov="
132 "[{iov_base=\"%s\", iov_len=%u}, {iov_base=\"\", iov_len=%u}]"
133 ", msg_iovlen=%u, msg_controllen=0, msg_flags=0}, 0) = %u\n"
134 " * %u bytes in buffer 0\n"
135 " | 00000 %-49s %-16s |\n",
136 r1_c, r_len, w_len, (unsigned int) ARRAY_SIZE(r1_iov_),
137 w_len - r_len, w_len - r_len, r1_d, r1_c);
138 close(0);
139
140 tprintf("+++ exited with 0 +++\n");
141 return 0;
142 }