summaryrefslogtreecommitdiffstats
path: root/drivers/atmodem/ussd.c
blob: 2e45317db61319017cbbbfc32e7a378b8cba110a (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
/*
 *
 *  oFono - Open Source Telephony
 *
 *  Copyright (C) 2008-2011  Intel Corporation. All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#define _GNU_SOURCE
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include <glib.h>

#include <ofono/log.h>
#include <ofono/modem.h>
#include <ofono/ussd.h>
#include "util.h"
#include "smsutil.h"
#include "vendor.h"

#include "gatchat.h"
#include "gatresult.h"

#include "atmodem.h"

static const char *cusd_prefix[] = { "+CUSD:", NULL };
static const char *none_prefix[] = { NULL };
static const char *cscs_prefix[] = { "+CSCS:", NULL };

struct ussd_data {
	GAtChat *chat;
	unsigned int vendor;
	enum at_util_charset charset;
};

static void read_charset_cb(gboolean ok, GAtResult *result,
				gpointer user_data)
{
	struct ussd_data *data = user_data;

	if (!ok)
		return;

	at_util_parse_cscs_query(result, &data->charset);
}

static const unsigned char *ucs2_gsm_to_packed(const char *content,
						long *msg_len,
						unsigned char *msg)
{
	unsigned char *decoded;
	long len;
	unsigned char *gsm;
	long written;
	unsigned char *packed;
	unsigned char buf[182 * 2]; /* 182 USSD chars * 2 (UCS2) */

	if (strlen(content) > sizeof(buf) * 2) /* Hex, 2 chars / byte */
		return NULL;

	decoded = decode_hex_own_buf(content, -1, &len, 0, buf);

	if (decoded == NULL)
		return NULL;

	gsm = convert_ucs2_to_gsm(decoded, len, NULL, &written, 0);

	if (gsm == NULL)
		return NULL;

	if (written > 182) {
		g_free(gsm);
		return NULL;
	}

	packed = pack_7bit_own_buf(gsm, written, 0, TRUE, msg_len, 0, msg);
	g_free(gsm);

	return packed;
}

static void cusd_parse(GAtResult *result, struct ofono_ussd *ussd)
{
	struct ussd_data *data = ofono_ussd_get_data(ussd);
	GAtResultIter iter;
	int status;
	const char *content;
	int dcs;
	enum sms_charset charset;
	unsigned char msg[160];
	const unsigned char *msg_ptr = NULL;
	long msg_len;

	g_at_result_iter_init(&iter, result);

	if (!g_at_result_iter_next(&iter, "+CUSD:"))
		return;

	if (!g_at_result_iter_next_number(&iter, &status))
		return;

	if (!g_at_result_iter_next_string(&iter, &content))
		goto out;

	if (!g_at_result_iter_next_number(&iter, &dcs))
		dcs = 0;

	if (!cbs_dcs_decode(dcs, NULL, NULL, &charset, NULL, NULL, NULL)) {
		ofono_error("Unsupported USSD data coding scheme (%02x)", dcs);
		status = 4; /* Not supported */
		goto out;
	}

	DBG("response charset %d modem charset %d", charset, data->charset);

	switch (charset) {
	case SMS_CHARSET_7BIT:
		switch (data->charset) {
		case AT_UTIL_CHARSET_GSM:
			msg_ptr = pack_7bit_own_buf((const guint8 *) content,
							-1, 0, TRUE, &msg_len,
							0, msg);
			break;

		case AT_UTIL_CHARSET_UTF8:
			if (ussd_encode(content, &msg_len, msg) == TRUE)
				msg_ptr = msg;

			break;

		case AT_UTIL_CHARSET_UCS2:
			msg_ptr = ucs2_gsm_to_packed(content, &msg_len, msg);
			break;

		default:
			msg_ptr = NULL;
		}
		break;

	case SMS_CHARSET_8BIT:
	case SMS_CHARSET_UCS2:
		msg_ptr = decode_hex_own_buf(content, -1, &msg_len, 0, msg);
		break;
	}

	DBG("msg ptr %p msg len %ld", msg_ptr, msg_len);

out:
	ofono_ussd_notify(ussd, status, dcs, msg_ptr, msg_ptr ? msg_len : 0);
}

static void cusd_request_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_ussd_cb_t cb = cbd->cb;
	struct ofono_ussd *ussd = cbd->user;
	struct ofono_error error;

	decode_at_error(&error, g_at_result_final_response(result));

	cb(&error, cbd->data);

	cusd_parse(result, ussd);
}

static void at_ussd_request(struct ofono_ussd *ussd, int dcs,
				const unsigned char *pdu, int len,
				ofono_ussd_cb_t cb, void *user_data)
{
	struct ussd_data *data = ofono_ussd_get_data(ussd);
	struct cb_data *cbd = cb_data_new(cb, user_data);
	char buf[512];
	enum sms_charset charset;

	cbd->user = ussd;

	if (!cbs_dcs_decode(dcs, NULL, NULL, &charset,
					NULL, NULL, NULL))
		goto error;

	if (charset == SMS_CHARSET_7BIT) {
		unsigned char unpacked_buf[182];
		long written;

		unpack_7bit_own_buf(pdu, len, 0, TRUE, sizeof(unpacked_buf),
					&written, 0, unpacked_buf);

		if (written < 1)
			goto error;

		snprintf(buf, sizeof(buf), "AT+CUSD=1,\"%.*s\",%d",
				(int) written, unpacked_buf, dcs);
	} else {
		char coded_buf[321];
		char *converted = encode_hex_own_buf(pdu, len, 0, coded_buf);

		if (converted == NULL)
			goto error;

		snprintf(buf, sizeof(buf), "AT+CUSD=1,\"%s\",%d",
				converted, dcs);
	}

	if (g_at_chat_send(data->chat, buf, cusd_prefix,
				cusd_request_cb, cbd, g_free) > 0)
		return;

error:
	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, user_data);
}

static void cusd_cancel_cb(gboolean ok, GAtResult *result, gpointer user_data)
{
	struct cb_data *cbd = user_data;
	ofono_ussd_cb_t cb = cbd->cb;
	struct ussd_data *data = cbd->user;
	struct ofono_error error;

	decode_at_error(&error, g_at_result_final_response(result));

	switch (data->vendor) {
	case OFONO_VENDOR_GOBI:
	case OFONO_VENDOR_QUALCOMM_MSM:
		/* All errors and notifications arrive unexpected and
		 * thus just reset the state here. This is safer than
		 * getting stuck in a dead-lock. */
		error.type = OFONO_ERROR_TYPE_NO_ERROR;
		error.error = 0;
		break;
	default:
		break;
	}

	cb(&error, cbd->data);
}

static void at_ussd_cancel(struct ofono_ussd *ussd,
				ofono_ussd_cb_t cb, void *user_data)
{
	struct ussd_data *data = ofono_ussd_get_data(ussd);
	struct cb_data *cbd = cb_data_new(cb, user_data);

	cbd->user = data;

	if (g_at_chat_send(data->chat, "AT+CUSD=2", none_prefix,
				cusd_cancel_cb, cbd, g_free) > 0)
		return;

	g_free(cbd);

	CALLBACK_WITH_FAILURE(cb, user_data);
}

static void cusd_notify(GAtResult *result, gpointer user_data)
{
	struct ofono_ussd *ussd = user_data;

	cusd_parse(result, ussd);
}

static void at_ussd_register(gboolean ok, GAtResult *result, gpointer user)
{
	struct ofono_ussd *ussd = user;
	struct ussd_data *data = ofono_ussd_get_data(ussd);

	if (!ok) {
		ofono_error("Could not enable CUSD notifications");
		ofono_ussd_remove(ussd);
		return;
	}

	g_at_chat_register(data->chat, "+CUSD:", cusd_notify,
						FALSE, ussd, NULL);

	ofono_ussd_register(ussd);
}

static int at_ussd_probe(struct ofono_ussd *ussd, unsigned int vendor,
				void *user)
{
	GAtChat *chat = user;
	struct ussd_data *data;

	data = g_new0(struct ussd_data, 1);
	data->chat = g_at_chat_clone(chat);
	data->vendor = vendor;

	ofono_ussd_set_data(ussd, data);

	g_at_chat_send(data->chat, "AT+CSCS?", cscs_prefix,
			read_charset_cb, data, NULL);

	g_at_chat_send(data->chat, "AT+CUSD=1", NULL,
			at_ussd_register, ussd, NULL);

	return 0;
}

static void at_ussd_remove(struct ofono_ussd *ussd)
{
	struct ussd_data *data = ofono_ussd_get_data(ussd);

	ofono_ussd_set_data(ussd, NULL);

	g_at_chat_unref(data->chat);
	g_free(data);
}

static struct ofono_ussd_driver driver = {
	.name		= "atmodem",
	.probe		= at_ussd_probe,
	.remove		= at_ussd_remove,
	.request	= at_ussd_request,
	.cancel		= at_ussd_cancel
};

void at_ussd_init(void)
{
	ofono_ussd_driver_register(&driver);
}

void at_ussd_exit(void)
{
	ofono_ussd_driver_unregister(&driver);
}