summaryrefslogtreecommitdiffstats
path: root/src/device_link_service.c
blob: 430b1db5447a04b23618d999d74e8039be60a5c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
 /* 
 * device_link_service.c
 * DeviceLink service implementation.
 * 
 * Copyright (c) 2010 Nikias Bassen, All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA 
 */
#include <string.h>
#include <stdlib.h>
#include "device_link_service.h"
#include "property_list_service.h"
#include "debug.h"

/**
 * Internally used function to extract the message string from a DLMessage*
 * plist.
 *
 * @param dl_msg The DeviceLink property list to parse.
 *
 * @return An allocated char* with the DLMessage from the given plist,
 *     or NULL when the plist does not contain any DLMessage. It is up to
 *     the caller to free the allocated memory.
 */
static char *device_link_service_get_message(plist_t dl_msg)
{
	uint32_t cnt = 0;
	plist_t cmd = 0;
	char *cmd_str = NULL;

	/* sanity check */
	if ((plist_get_node_type(dl_msg) != PLIST_ARRAY) || ((cnt = plist_array_get_size(dl_msg)) < 1)) {
		return NULL;
	}

	/* get dl command */
	cmd = plist_array_get_item(dl_msg, 0);
	if (!cmd || (plist_get_node_type(cmd) != PLIST_STRING)) {
		return NULL;
	}

	plist_get_string_val(cmd, &cmd_str);
	if (!cmd_str) {
		return NULL;
	}

	if ((strlen(cmd_str) < (strlen("DLMessage")+1))
	    || (strncmp(cmd_str, "DLMessage", strlen("DLMessage")))) {
		free(cmd_str);
		return NULL;
	}

	/* we got a DLMessage* command */
	return cmd_str;
}

/**
 * Creates a new device link service client.
 *
 * @param device The device to connect to.
 * @param port Port on device to connect to.
 * @param client Reference that will point to a newly allocated
 *     device_link_service_client_t upon successful return.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG when one of the parameters is invalid,
 *     or DEVICE_LINK_SERVICE_E_MUX_ERROR when the connection failed.
 */
device_link_service_error_t device_link_service_client_new(idevice_t device, uint16_t port, device_link_service_client_t *client)
{
	if (!device || port == 0 || !client || *client) {
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;
	}

	property_list_service_client_t plistclient = NULL;
	if (property_list_service_client_new(device, port, &plistclient) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		return DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}

	/* create client object */
	device_link_service_client_t client_loc = (device_link_service_client_t) malloc(sizeof(struct device_link_service_client_int));
	client_loc->parent = plistclient;

	/* all done, return success */
	*client = client_loc;
	return DEVICE_LINK_SERVICE_E_SUCCESS;
}

/**
 * Frees a device link service client.
 *
 * @param client The device_link_service_client_t to free.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG when one of client or client->parent
 *     is invalid, or DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR when the was an error
 *     freeing the parent property_list_service client.
 */
device_link_service_error_t device_link_service_client_free(device_link_service_client_t client)
{
	if (!client)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	if (property_list_service_client_free(client->parent) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		return DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR;
	}
	return DEVICE_LINK_SERVICE_E_SUCCESS;
}

/**
 * Performs the DLMessageVersionExchange with the connected device.
 * This should be the first operation to be executed by an implemented
 * device link service client.
 *
 * @param client The device_link_service client to use.
 * @param version_major The major version number to check.
 * @param version_minor The minor version number to check.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG when client is NULL,
 *     DEVICE_LINK_SERVICE_E_MUX_ERROR when a communication error occurs,
 *     DEVICE_LINK_SERVICE_E_PLIST_ERROR when the received plist has not the
 *     expected contents, DEVICE_LINK_SERVICE_E_BAD_VERSION when the version
 *     given by the device is larger than the given version,
 *     or DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR otherwise.
 */
device_link_service_error_t device_link_service_version_exchange(device_link_service_client_t client, uint64_t version_major, uint64_t version_minor)
{
	if (!client)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;
	
	device_link_service_error_t err = DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR;

	/* perform version exchange */
	plist_t array = NULL;
	char *msg = NULL;

	/* receive DLMessageVersionExchange from device */
	if (property_list_service_receive_plist(client->parent, &array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		debug_info("Did not receive initial message from device!");
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
		goto leave;
	}
	msg = device_link_service_get_message(array);
	if (!msg || strcmp(msg, "DLMessageVersionExchange")) {
		debug_info("Did not receive DLMessageVersionExchange from device!");
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
		goto leave;
	}
	free(msg);
	msg = NULL;

	/* get major and minor version number */
	if (plist_array_get_size(array) < 3) {
		debug_info("DLMessageVersionExchange has unexpected format!");
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
		goto leave;
	}
	plist_t maj = plist_array_get_item(array, 1);
	plist_t min = plist_array_get_item(array, 2);
	uint64_t vmajor = 0;
	uint64_t vminor = 0;
	if (maj) {
		plist_get_uint_val(maj, &vmajor);
	}
	if (min) {
		plist_get_uint_val(min, &vminor);
	}
	if (vmajor > version_major) {
		debug_info("Version mismatch: device=(%lld,%lld) > expected=(%lld,%lld)", vmajor, vminor, version_major, version_minor);
		err = DEVICE_LINK_SERVICE_E_BAD_VERSION;
		goto leave;
	} else if ((vmajor == version_major) && (vminor > version_minor)) {
		debug_info("WARNING: Version mismatch: device=(%lld,%lld) > expected=(%lld,%lld)", vmajor, vminor, version_major, version_minor);
		err = DEVICE_LINK_SERVICE_E_BAD_VERSION;
		goto leave;
	}
	plist_free(array);

	/* version is ok, send reply */
	array = plist_new_array();
	plist_array_append_item(array, plist_new_string("DLMessageVersionExchange"));
	plist_array_append_item(array, plist_new_string("DLVersionsOk"));
	plist_array_append_item(array, plist_new_uint(version_major));
	if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		debug_info("Error when sending DLVersionsOk");
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
		goto leave;
	}
	plist_free(array);

	/* receive DeviceReady message */
	array = NULL;
	if (property_list_service_receive_plist(client->parent, &array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		debug_info("Error when receiving DLMessageDeviceReady!");
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
		goto leave;
	}
	msg = device_link_service_get_message(array);
	if (!msg || strcmp(msg, "DLMessageDeviceReady")) {
		debug_info("Did not get DLMessageDeviceReady!");
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
		goto leave;
	}
	err = DEVICE_LINK_SERVICE_E_SUCCESS;

leave:
	if (msg) {
		free(msg);
	}
	if (array) {
		plist_free(array);
	}
	return err;
}

/**
 * Performs a disconnect with the connected device link service client.
 *
 * @param client The device link service client to disconnect.
 * 
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG if client is NULL,
 *     or DEVICE_LINK_SERVICE_E_MUX_ERROR when there's an error when sending
 *     the the disconnect message.
 */
device_link_service_error_t device_link_service_disconnect(device_link_service_client_t client)
{
	if (!client)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	plist_t array = plist_new_array();
	plist_array_append_item(array, plist_new_string("DLMessageDisconnect"));
	plist_array_append_item(array, plist_new_string("All done, thanks for the memories"));

	device_link_service_error_t err = DEVICE_LINK_SERVICE_E_SUCCESS;
	if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}
	plist_free(array);
	return err;
}

/**
 * Sends a DLMessagePing plist.
 *
 * @param client The device link service client to use.
 * @param message String to send as ping message.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG if client or message is invalid,
 *     or DEVICE_LINK_SERVICE_E_MUX_ERROR if the DLMessagePing plist could
 *     not be sent.
 */
device_link_service_error_t device_link_service_send_ping(device_link_service_client_t client, const char *message)
{
	if (!client || !client->parent || !message)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	plist_t array = plist_new_array();
	plist_array_append_item(array, plist_new_string("DLMessagePing"));
	plist_array_append_item(array, plist_new_string(message));

	device_link_service_error_t err = DEVICE_LINK_SERVICE_E_SUCCESS;
	if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}
	plist_free(array);
	return err;
}

/**
 * Sends a DLMessageProcessMessage plist.
 *
 * @param client The device link service client to use.
 * @param message PLIST_DICT to send.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG if client or message is invalid or
 *     message is not a PLIST_DICT, or DEVICE_LINK_SERVICE_E_MUX_ERROR if
 *     the DLMessageProcessMessage plist could not be sent.
 */
device_link_service_error_t device_link_service_send_process_message(device_link_service_client_t client, plist_t message)
{
	if (!client || !client->parent || !message)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	if (plist_get_node_type(message) != PLIST_DICT)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	plist_t array = plist_new_array();
	plist_array_append_item(array, plist_new_string("DLMessageProcessMessage"));
	plist_array_append_item(array, plist_copy(message));

	device_link_service_error_t err = DEVICE_LINK_SERVICE_E_SUCCESS;
	if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}
	plist_free(array);
	return err;
}

/**
 * Receives a DLMessageProcessMessage plist.
 *
 * @param client The connected device link service client used for receiving.
 * @param message Pointer to a plist that will be set to the contents of the
 *    message contents upon successful return.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS when a DLMessageProcessMessage was
 *    received, DEVICE_LINK_SERVICE_E_INVALID_ARG when client or message is
 *    invalid, DEVICE_LINK_SERVICE_E_PLIST_ERROR if the received plist is
 *    invalid or is not a DLMessageProcessMessage,
 *    or DEVICE_LINK_SERVICE_E_MUX_ERROR if receiving from device fails.
 */
device_link_service_error_t device_link_service_receive_process_message(device_link_service_client_t client, plist_t *message)
{
	if (!client || !client->parent || !message)
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;

	plist_t pmsg = NULL;
	if (property_list_service_receive_plist(client->parent, &pmsg) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		return DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}

	device_link_service_error_t err = DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR;

	char *msg = device_link_service_get_message(pmsg);
	if (!msg || strcmp(msg, "DLMessageProcessMessage")) {
		debug_info("Did not receive DLMessageProcessMessage as expected!");
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
		goto leave;
	}

	if (plist_array_get_size(pmsg) != 2) {
		debug_info("Malformed plist received for DLMessageProcessMessage");
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
		goto leave;
	}

	plist_t msg_loc = plist_array_get_item(pmsg, 1);
	if (msg_loc) {
		*message = plist_copy(msg_loc);
		err = DEVICE_LINK_SERVICE_E_SUCCESS;
	} else {
		*message = NULL;
		err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
	}

leave:
	if (msg)
		free(msg);
	if (pmsg)
		plist_free(pmsg);

	return err;
}

/**
 * Generic device link service send function.
 *
 * @param client The device link service client to use for sending
 * @param plist The property list to send
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG when client or plist is NULL,
 *     or DEVICE_LINK_SERVICE_E_MUX_ERROR when the given property list could
 *     not be sent.
 */
device_link_service_error_t device_link_service_send(device_link_service_client_t client, plist_t plist)
{
	if (!client || !plist) {
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;
	}
	if (property_list_service_send_binary_plist(client->parent, plist) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		return DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}
	return DEVICE_LINK_SERVICE_E_SUCCESS;
}

/* Generic device link service receive function.
 *
 * @param client The device link service client to use for sending
 * @param plist Pointer that will point to the property list received upon
 *     successful return.
 *
 * @return DEVICE_LINK_SERVICE_E_SUCCESS on success,
 *     DEVICE_LINK_SERVICE_E_INVALID_ARG when client or plist is NULL,
 *     or DEVICE_LINK_SERVICE_E_MUX_ERROR when no property list could be
 *     received.
 */
device_link_service_error_t device_link_service_receive(device_link_service_client_t client, plist_t *plist)
{
	if (!client || !plist || (plist && *plist)) {
		return DEVICE_LINK_SERVICE_E_INVALID_ARG;
	}

	if (property_list_service_receive_plist(client->parent, plist) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
		return DEVICE_LINK_SERVICE_E_MUX_ERROR;
	}
	return DEVICE_LINK_SERVICE_E_SUCCESS;
}