1 /*
2 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
3 * Copyright (c) 2017-2018 The strace developers.
4 * All rights reserved.
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 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "tests.h"
30 #include <string.h>
31 #include <stdio.h>
32 #include <sys/socket.h>
33 #include <arpa/inet.h>
34 #include "netlink.h"
35 #include "netlink_kobject_uevent.h"
36
37 static const char *errstr;
38
39 static ssize_t
sys_send(const int fd,const void * const buf,const size_t len)40 sys_send(const int fd, const void *const buf, const size_t len)
41 {
42 const ssize_t rc = sendto(fd, buf, len, MSG_DONTWAIT, NULL, 0);
43 errstr = sprintrc(rc);
44 return rc;
45 }
46
47 static void
test_nlmsg_type_udev(const int fd)48 test_nlmsg_type_udev(const int fd)
49 {
50 static const char extra[] = "12345678";
51 struct udev_monitor_netlink_header uh = {
52 .prefix = "libudev",
53 .magic = htonl(0xfeedcafe),
54 .header_size = sizeof(uh),
55 .properties_off = 40,
56 .properties_len = 299,
57 .filter_subsystem_hash = htonl(0xc370b302),
58 .filter_devtype_hash = htonl(0x10800000),
59 .filter_tag_bloom_hi = htonl(0x2000400),
60 .filter_tag_bloom_lo = htonl(0x10800000),
61 };
62 const unsigned int extra_len = LENGTH_OF(extra);
63 const unsigned int uh_len = sizeof(uh);
64
65 char *const buf = tail_alloc(uh_len + extra_len);
66 memcpy(buf + extra_len, &uh, uh_len);
67
68 sys_send(fd, buf + extra_len, uh_len);
69 printf("sendto(%d, {{prefix=\"%s\", magic=htonl(%#x)"
70 ", header_size=%u, properties_off=%u, properties_len=%u"
71 ", filter_subsystem_hash=htonl(%#x)"
72 ", filter_devtype_hash=htonl(%#x)"
73 ", filter_tag_bloom_hi=htonl(%#x)"
74 ", filter_tag_bloom_lo=htonl(%#x)}}, %u, MSG_DONTWAIT, NULL, "
75 "0) = %s\n"
76 , fd, uh.prefix,
77 ntohl(uh.magic), uh.header_size, uh.properties_off,
78 uh.properties_len, ntohl(uh.filter_subsystem_hash),
79 ntohl(uh.filter_devtype_hash), ntohl(uh.filter_tag_bloom_hi),
80 ntohl(uh.filter_tag_bloom_lo), uh_len, errstr);
81
82 memcpy(buf, &uh, uh_len);
83 memcpy(buf + uh_len, extra, extra_len);
84 sys_send(fd, buf, uh_len + extra_len);
85 printf("sendto(%d, {{prefix=\"%s\", magic=htonl(%#x)"
86 ", header_size=%u, properties_off=%u, properties_len=%u"
87 ", filter_subsystem_hash=htonl(%#x)"
88 ", filter_devtype_hash=htonl(%#x)"
89 ", filter_tag_bloom_hi=htonl(%#x)"
90 ", filter_tag_bloom_lo=htonl(%#x)}, "
91 , fd, uh.prefix,
92 ntohl(uh.magic), uh.header_size, uh.properties_off,
93 uh.properties_len, ntohl(uh.filter_subsystem_hash),
94 ntohl(uh.filter_devtype_hash), ntohl(uh.filter_tag_bloom_hi),
95 ntohl(uh.filter_tag_bloom_lo));
96 print_quoted_memory(buf + uh_len, extra_len);
97 printf("}, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
98 uh_len + extra_len, errstr);
99
100 memcpy(buf + extra_len + 1, &uh, uh_len - 1);
101 sys_send(fd, buf + extra_len + 1, uh_len);
102 printf("sendto(%d, ", fd);
103 print_quoted_memory(&uh, MIN(uh_len - 1, DEFAULT_STRLEN));
104 printf("%s, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
105 (uh_len - 1 > DEFAULT_STRLEN ? "..." : ""),
106 uh_len, errstr);
107 }
108
109 static void
test_nlmsg_type_kernel(const int fd)110 test_nlmsg_type_kernel(const int fd)
111 {
112 struct udev_monitor_netlink_header uh = {
113 .prefix = "change@",
114 .magic = htonl(0xfeedcafe),
115 .header_size = sizeof(uh),
116 .properties_off = 10,
117 .properties_len = 299,
118 .filter_subsystem_hash = htonl(0xfffffff),
119 .filter_devtype_hash = htonl(0x10000000),
120 .filter_tag_bloom_hi = htonl(0x2000400),
121 };
122 const unsigned int uh_len = sizeof(uh);
123
124 TAIL_ALLOC_OBJECT_CONST_PTR(struct udev_monitor_netlink_header, p);
125 memcpy(p, &uh, uh_len);
126
127 sys_send(fd, p, uh_len);
128 printf("sendto(%d, ", fd);
129 print_quoted_memory(&uh, MIN(uh_len, DEFAULT_STRLEN));
130 printf("%s, %u, MSG_DONTWAIT, NULL, 0) = %s\n",
131 (uh_len > DEFAULT_STRLEN ? "..." : ""),
132 uh_len, errstr);
133 }
134
135 int
main(void)136 main(void)
137 {
138 skip_if_unavailable("/proc/self/fd/");
139
140 int fd = create_nl_socket(NETLINK_KOBJECT_UEVENT);
141
142 test_nlmsg_type_udev(fd);
143 test_nlmsg_type_kernel(fd);
144 /* test using data that looks like a zero-length C string */
145 char *const buf = tail_alloc(DEFAULT_STRLEN + 1);
146 buf[0] = '=';
147 fill_memory_ex(buf + 1, DEFAULT_STRLEN, 0, DEFAULT_STRLEN);
148
149 sys_send(fd, buf + 1, DEFAULT_STRLEN);
150 printf("sendto(%d, ", fd);
151 print_quoted_memory(buf + 1, DEFAULT_STRLEN);
152 printf(", %u, MSG_DONTWAIT, NULL, 0) = %s\n",
153 DEFAULT_STRLEN, errstr);
154
155 sys_send(fd, buf, DEFAULT_STRLEN + 1);
156 printf("sendto(%d, ", fd);
157 print_quoted_memory(buf, DEFAULT_STRLEN);
158 printf("..., %u, MSG_DONTWAIT, NULL, 0) = %s\n",
159 DEFAULT_STRLEN + 1, errstr);
160
161 puts("+++ exited with 0 +++");
162 return 0;
163 }
164