1 /* Simple sanity-check for D-Bus message serialization.
3 * Author: Simon McVittie <simon.mcvittie@collabora.co.uk>
4 * Copyright © 2010-2011 Nokia Corporation
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32 #include <dbus/dbus.h>
33 #include <dbus/dbus-glib-lowlevel.h>
40 assert_no_error (const DBusError *e)
42 if (G_UNLIKELY (dbus_error_is_set (e)))
43 g_error ("expected success but got error: %s: %s", e->name, e->message);
48 gconstpointer arg G_GNUC_UNUSED)
50 dbus_error_init (&f->e);
53 /* this is meant to be obviously correct, not efficient! */
55 get_uint32 (const gchar *blob,
63 (blob[offset + 1] << 8) |
64 (blob[offset + 2] << 16) |
65 (blob[offset + 3] << 24);
67 else if (endian == 'B')
70 (blob[offset] << 24) |
71 (blob[offset + 1] << 16) |
72 (blob[offset + 2] << 8) |
77 g_assert_not_reached ();
81 #define BLOB_LENGTH (sizeof (le_blob) - 1)
82 #define OFFSET_BODY_LENGTH (4)
83 #define OFFSET_SERIAL (8)
85 const gchar le_blob[] =
87 /* yyyyuu fixed headers */
88 "l" /* little-endian */
89 "\2" /* reply (which is the simplest message) */
90 "\2" /* no auto-starting */
91 "\1" /* D-Bus version = 1 */
93 "\4\0\0\0" /* bytes in body = 4 */
95 "\x78\x56\x34\x12" /* serial number = 0x12345678 */
97 /* a(uv) variable headers start here */
98 "\x0f\0\0\0" /* bytes in array of variable headers = 15 */
99 /* pad to 8-byte boundary = nothing */
101 "\5" /* in reply to: */
102 "\1u\0" /* variant signature = u */
103 /* pad to 4-byte boundary = nothing */
104 "\x12\xef\xcd\xab" /* 0xabcdef12 */
105 /* pad to 8-byte boundary = nothing */
107 "\x08" /* signature: */
108 "\1g\0" /* variant signature = g */
109 "\1u\0" /* 1 byte, u, NUL (no alignment needed) */
110 "\0" /* pad to 8-byte boundary for body */
112 "\xef\xbe\xad\xde" /* 0xdeadbeef */
115 const gchar be_blob[] =
117 /* yyyyuu fixed headers */
119 "\2" /* reply (which is the simplest message) */
120 "\2" /* no auto-starting */
121 "\1" /* D-Bus version = 1 */
123 "\0\0\0\4" /* bytes in body = 4 */
125 "\x12\x34\x56\x78" /* serial number = 0x12345678 */
127 /* a(uv) variable headers start here */
128 "\0\0\0\x0f" /* bytes in array of variable headers = 15 */
129 /* pad to 8-byte boundary = nothing */
131 "\5" /* in reply to: */
132 "\1u\0" /* variant signature = u */
133 /* pad to 4-byte boundary = nothing */
134 "\xab\xcd\xef\x12" /* 0xabcdef12 */
135 /* pad to 8-byte boundary = nothing */
137 "\x08" /* signature: */
138 "\1g\0" /* variant signature = g */
139 "\1u\0" /* 1 byte, u, NUL (no alignment needed) */
140 "\0" /* pad to 8-byte boundary for body */
142 "\xde\xad\xbe\xef" /* 0xdeadbeef */
146 test_endian (Fixture *f,
149 const gchar *blob = arg;
156 g_assert_cmpuint ((guint) sizeof (le_blob), ==, (guint) sizeof (be_blob));
158 g_assert_cmpuint (get_uint32 (blob, OFFSET_BODY_LENGTH, blob[0]), ==, 4);
159 g_assert_cmpuint (get_uint32 (blob, OFFSET_SERIAL, blob[0]), ==,
162 len = dbus_message_demarshal_bytes_needed (blob, sizeof (le_blob));
163 /* everything in the string except the implicit "\0" at the end is part of
165 g_assert_cmpint (len, ==, BLOB_LENGTH);
167 m = dbus_message_demarshal (blob, sizeof (le_blob), &f->e);
168 assert_no_error (&f->e);
169 g_assert (m != NULL);
171 g_assert_cmpuint (dbus_message_get_serial (m), ==, 0x12345678u);
172 g_assert_cmpuint (dbus_message_get_reply_serial (m), ==, 0xabcdef12u);
173 g_assert_cmpstr (dbus_message_get_signature (m), ==, "u");
175 /* Implementation detail: appending to the message results in it being
176 * byteswapped into compiler byte order, which exposed a bug in libdbus,
177 * fd.o #38120. (If that changes, this test might not exercise that
178 * particular bug but will still be valid.) */
180 ok = dbus_message_append_args (m,
181 DBUS_TYPE_UINT32, &u,
185 dbus_message_marshal (m, &output, &len);
187 g_assert (output[0] == 'l' || output[0] == 'B');
188 /* the single-byte fields are unaffected, even if the endianness was
190 g_assert_cmpint (output[1], ==, blob[1]);
191 g_assert_cmpint (output[2], ==, blob[2]);
192 g_assert_cmpint (output[3], ==, blob[3]);
193 /* the length and serial are in the new endianness, the length has expanded
194 * to 8, and the serial is correct */
195 g_assert_cmpuint (get_uint32 (output, OFFSET_BODY_LENGTH, output[0]), ==, 8);
196 g_assert_cmpuint (get_uint32 (output, OFFSET_SERIAL, output[0]), ==,
198 /* the second "u" in the signature replaced a padding byte, so only
199 * the length of the body changed */
200 g_assert_cmpint (len, ==, BLOB_LENGTH + 4);
204 test_needed (Fixture *f,
207 const gchar *blob = arg;
209 /* We need at least 16 bytes to know how long the message is - that's just
210 * a fact of the D-Bus protocol. */
212 dbus_message_demarshal_bytes_needed (blob, 0), ==, 0);
214 dbus_message_demarshal_bytes_needed (blob, 15), ==, 0);
215 /* This is enough that we should be able to tell how much we need. */
217 dbus_message_demarshal_bytes_needed (blob, 16), ==, BLOB_LENGTH);
218 /* The header is 32 bytes long (here), so that's another interesting
221 dbus_message_demarshal_bytes_needed (blob, 31), ==, BLOB_LENGTH);
223 dbus_message_demarshal_bytes_needed (blob, 32), ==, BLOB_LENGTH);
225 dbus_message_demarshal_bytes_needed (blob, 33), ==, BLOB_LENGTH);
227 dbus_message_demarshal_bytes_needed (blob, BLOB_LENGTH - 1), ==,
230 dbus_message_demarshal_bytes_needed (blob, BLOB_LENGTH), ==,
233 dbus_message_demarshal_bytes_needed (blob, sizeof (be_blob)), ==,
238 teardown (Fixture *f,
239 gconstpointer arg G_GNUC_UNUSED)
241 dbus_error_free (&f->e);
249 char *aligned_le_blob;
250 char *aligned_be_blob;
252 g_test_init (&argc, &argv, NULL);
254 /* We have to pass in a buffer that's at least "default aligned",
255 * i.e. on GNU systems to 8 or 16. The linker may have only given
256 * us byte-alignment for the char[] static variables.
258 aligned_le_blob = g_malloc (sizeof (le_blob));
259 memcpy (aligned_le_blob, le_blob, sizeof (le_blob));
260 aligned_be_blob = g_malloc (sizeof (be_blob));
261 memcpy (aligned_be_blob, be_blob, sizeof (be_blob));
263 g_test_add ("/demarshal/le", Fixture, aligned_le_blob, setup, test_endian, teardown);
264 g_test_add ("/demarshal/be", Fixture, aligned_be_blob, setup, test_endian, teardown);
265 g_test_add ("/demarshal/needed/le", Fixture, aligned_le_blob, setup, test_needed,
267 g_test_add ("/demarshal/needed/be", Fixture, aligned_be_blob, setup, test_needed,
271 g_free (aligned_le_blob);
272 g_free (aligned_be_blob);