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7c8ae47d GS |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2018-2019 Gerhard Sittig <gerhard.sittig@gmx.net> | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | /* | |
21 | * Scan support for Bluetooth LE devices is modelled after the MIT licensed | |
22 | * https://github.com/carsonmcdonald/bluez-experiments experiments/scantest.c | |
23 | * example source code which is: | |
24 | * | |
25 | * The MIT License (MIT) | |
26 | * | |
27 | * Copyright (c) 2013 Carson McDonald | |
28 | * | |
29 | * Permission is hereby granted, free of charge, to any person obtaining a copy of | |
30 | * this software and associated documentation files (the "Software"), to deal in | |
31 | * the Software without restriction, including without limitation the rights to | |
32 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
33 | * the Software, and to permit persons to whom the Software is furnished to do so, | |
34 | * subject to the following conditions: | |
35 | * | |
36 | * The above copyright notice and this permission notice shall be included in all | |
37 | * copies or substantial portions of the Software. | |
38 | * | |
39 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
40 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
41 | * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | |
42 | * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
43 | * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
44 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
45 | */ | |
46 | ||
47 | /* | |
48 | * This file implements an internal platform agnostic API of libsigrok | |
49 | * for Bluetooth communication, as well as the first implementation on a | |
50 | * specific platform which is based on the BlueZ library and got tested | |
51 | * on Linux. | |
52 | * | |
53 | * TODO | |
54 | * - Separate the "common" from the "bluez specific" parts. The current | |
55 | * implementation uses the fact that HAVE_BLUETOOTH exclusively depends | |
56 | * on HAVE_LIBBLUEZ, and thus both are identical. | |
57 | * - Add missing features to the Linux platform support: Scan without | |
58 | * root privileges, UUID to handle translation. | |
59 | * - Add support for other platforms. | |
60 | */ | |
61 | ||
62 | #include "config.h" | |
63 | ||
64 | /* Unconditionally compile the source, optionally end up empty. */ | |
65 | #ifdef HAVE_BLUETOOTH | |
66 | ||
67 | #ifdef HAVE_LIBBLUEZ | |
68 | #include <bluetooth/bluetooth.h> | |
69 | #include <bluetooth/hci.h> | |
70 | #include <bluetooth/hci_lib.h> | |
71 | #include <bluetooth/l2cap.h> | |
72 | #include <bluetooth/rfcomm.h> | |
73 | #endif | |
74 | #include <ctype.h> | |
75 | #include <errno.h> | |
76 | #include <glib.h> | |
a8b0e6f5 | 77 | #include <inttypes.h> |
7c8ae47d GS |
78 | #include <poll.h> |
79 | #include <stdarg.h> | |
80 | #include <stdio.h> | |
81 | #include <stdlib.h> | |
82 | #include <string.h> | |
684b26ef | 83 | #include <sys/uio.h> |
7c8ae47d GS |
84 | #include <sys/socket.h> |
85 | #include <time.h> | |
86 | #include <unistd.h> | |
87 | ||
88 | #include <libsigrok/libsigrok.h> | |
89 | #include "libsigrok-internal.h" | |
90 | ||
7c8ae47d | 91 | #define LOG_PREFIX "bt-bluez" |
7c8ae47d | 92 | |
113de3a5 | 93 | #define CONNECT_BLE_TIMEOUT 20 /* Connect timeout in seconds. */ |
7c8ae47d GS |
94 | #define STORE_MAC_REVERSE 1 |
95 | #define ACCEPT_NONSEP_MAC 1 | |
96 | ||
4704f645 AS |
97 | #define CONNECT_RFCOMM_TRIES 3 |
98 | #define CONNECT_RFCOMM_RETRY_MS 100 | |
99 | ||
7c8ae47d GS |
100 | /* {{{ compat decls */ |
101 | /* | |
102 | * The availability of conversion helpers in <bluetooth/bluetooth.h> | |
103 | * appears to be version dependent. Let's provide the helper here if | |
104 | * the header doesn't. | |
105 | */ | |
106 | ||
7c8ae47d GS |
107 | /* }}} compat decls */ |
108 | /* {{{ Linux socket specific decls */ | |
109 | ||
110 | #define BLE_ATT_ERROR_RESP 0x01 | |
111 | #define BLE_ATT_EXCHANGE_MTU_REQ 0x02 | |
112 | #define BLE_ATT_EXCHANGE_MTU_RESP 0x03 | |
113 | #define BLE_ATT_FIND_INFORMATION_REQ 0x04 | |
114 | #define BLE_ATT_FIND_INFORMATION_RESP 0x05 | |
115 | #define BLE_ATT_FIND_BY_TYPE_REQ 0x06 | |
116 | #define BLE_ATT_FIND_BY_TYPE_RESP 0x07 | |
117 | #define BLE_ATT_READ_BY_TYPE_REQ 0x08 | |
118 | #define BLE_ATT_READ_BY_TYPE_RESP 0x09 | |
119 | #define BLE_ATT_READ_REQ 0x0a | |
120 | #define BLE_ATT_READ_RESP 0x0b | |
121 | #define BLE_ATT_READ_BLOB_REQ 0x0c | |
122 | #define BLE_ATT_READ_BLOB_RESP 0x0d | |
123 | #define BLE_ATT_READ_MULTIPLE_REQ 0x0e | |
124 | #define BLE_ATT_READ_MULTIPLE_RESP 0x0f | |
125 | #define BLE_ATT_READ_BY_GROUP_REQ 0x10 | |
126 | #define BLE_ATT_READ_BY_GROUP_RESP 0x11 | |
127 | #define BLE_ATT_WRITE_REQ 0x12 | |
128 | #define BLE_ATT_WRITE_RESP 0x13 | |
129 | #define BLE_ATT_WRITE_CMD 0x16 | |
130 | #define BLE_ATT_HANDLE_NOTIFICATION 0x1b | |
131 | #define BLE_ATT_HANDLE_INDICATION 0x1d | |
132 | #define BLE_ATT_HANDLE_CONFIRMATION 0x1e | |
133 | #define BLE_ATT_SIGNED_WRITE_CMD 0x52 | |
134 | ||
135 | /* }}} Linux socket specific decls */ | |
136 | /* {{{ conversion */ | |
137 | ||
138 | /* | |
139 | * Convert textual MAC presentation to array of bytes. In contrast to | |
140 | * BlueZ conversion, accept colon or dash separated input as well as a | |
141 | * dense format without separators (001122334455). We expect to use the | |
142 | * library in an environment where colons are not always available as a | |
143 | * separator in user provided specs, while users do want to use some | |
144 | * separator for readability. | |
145 | * | |
146 | * TODO Instead of doing the actual conversion here (and dealing with | |
147 | * BlueZ' internal byte order for device address bytes), we might as | |
148 | * well just transform the input string to an output string, and always | |
149 | * use the officially provided str2ba() conversion routine. | |
150 | */ | |
151 | static int sr_bt_mac_text_to_bytes(const char *text, uint8_t *buf) | |
152 | { | |
153 | size_t len; | |
154 | long v; | |
155 | char *endp; | |
156 | char numbuf[3]; | |
157 | ||
158 | len = 6; | |
159 | if (STORE_MAC_REVERSE) | |
160 | buf += len; | |
161 | endp = (char *)text; | |
162 | while (len && endp && *endp) { | |
163 | text = endp; | |
164 | if (ACCEPT_NONSEP_MAC) { | |
165 | numbuf[0] = endp[0]; | |
166 | numbuf[1] = endp[0] ? endp[1] : '\0'; | |
167 | numbuf[2] = '\0'; | |
168 | } | |
169 | endp = NULL; | |
170 | v = strtol(ACCEPT_NONSEP_MAC ? numbuf : text, &endp, 16); | |
171 | if (!endp) | |
172 | break; | |
173 | if (*endp != ':' && *endp != '-' && *endp != '\0') | |
174 | break; | |
175 | if (v < 0 || v > 255) | |
176 | break; | |
177 | if (STORE_MAC_REVERSE) | |
178 | *(--buf) = v; | |
179 | else | |
180 | *buf++ = v; | |
181 | len--; | |
182 | if (ACCEPT_NONSEP_MAC) | |
183 | endp = (char *)text + (endp - numbuf); | |
184 | if (*endp == ':' || *endp == '-') | |
185 | endp++; | |
186 | } | |
187 | ||
188 | if (len) { | |
189 | sr_err("Failed to parse MAC, too few bytes in '%s'", text); | |
190 | return -1; | |
191 | } | |
192 | while (isspace(*endp)) | |
193 | endp++; | |
194 | if (*endp) { | |
195 | sr_err("Failed to parse MAC, excess data in '%s'", text); | |
196 | return -1; | |
197 | } | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | /* }}} conversion */ | |
203 | /* {{{ helpers */ | |
204 | ||
205 | SR_PRIV const char *sr_bt_adapter_get_address(size_t idx) | |
206 | { | |
207 | int rc; | |
208 | struct hci_dev_info info; | |
209 | char addr[20]; | |
210 | ||
211 | rc = hci_devinfo(idx, &info); | |
0f92d5db | 212 | sr_spew("DIAG: hci_devinfo(%zu) => rc %d", idx, rc); |
7c8ae47d GS |
213 | if (rc < 0) |
214 | return NULL; | |
215 | ||
216 | rc = ba2str(&info.bdaddr, addr); | |
0f92d5db | 217 | sr_spew("DIAG: ba2str() => rc %d", rc); |
7c8ae47d GS |
218 | if (rc < 0) |
219 | return NULL; | |
220 | ||
221 | return g_strdup(addr); | |
222 | } | |
223 | ||
224 | /* }}} helpers */ | |
225 | /* {{{ descriptor */ | |
226 | ||
227 | struct sr_bt_desc { | |
228 | /* User servicable options. */ | |
229 | sr_bt_scan_cb scan_cb; | |
230 | void *scan_cb_data; | |
231 | sr_bt_data_cb data_cb; | |
232 | void *data_cb_data; | |
233 | char local_addr[20]; | |
234 | char remote_addr[20]; | |
235 | size_t rfcomm_channel; | |
236 | uint16_t read_handle; | |
237 | uint16_t write_handle; | |
238 | uint16_t cccd_handle; | |
239 | uint16_t cccd_value; | |
25d7c995 | 240 | uint16_t ble_mtu; |
7c8ae47d GS |
241 | /* Internal state. */ |
242 | int devid; | |
243 | int fd; | |
244 | struct hci_filter orig_filter; | |
245 | }; | |
246 | ||
247 | static int sr_bt_desc_open(struct sr_bt_desc *desc, int *id_ref); | |
248 | static void sr_bt_desc_close(struct sr_bt_desc *desc); | |
249 | static int sr_bt_check_socket_usable(struct sr_bt_desc *desc); | |
250 | static ssize_t sr_bt_write_type(struct sr_bt_desc *desc, uint8_t type); | |
7c8ae47d GS |
251 | static ssize_t sr_bt_write_type_handle(struct sr_bt_desc *desc, |
252 | uint8_t type, uint16_t handle); | |
7c8ae47d GS |
253 | static ssize_t sr_bt_write_type_handle_bytes(struct sr_bt_desc *desc, |
254 | uint8_t type, uint16_t handle, const uint8_t *data, size_t len); | |
255 | static ssize_t sr_bt_char_write_req(struct sr_bt_desc *desc, | |
256 | uint16_t handle, const void *data, size_t len); | |
257 | ||
258 | SR_PRIV struct sr_bt_desc *sr_bt_desc_new(void) | |
259 | { | |
260 | struct sr_bt_desc *desc; | |
261 | ||
262 | desc = g_malloc0(sizeof(*desc)); | |
263 | if (!desc) | |
264 | return NULL; | |
265 | ||
266 | desc->devid = -1; | |
267 | desc->fd = -1; | |
268 | ||
269 | return desc; | |
270 | } | |
271 | ||
272 | SR_PRIV void sr_bt_desc_free(struct sr_bt_desc *desc) | |
273 | { | |
274 | if (!desc) | |
275 | return; | |
276 | ||
277 | sr_bt_desc_close(desc); | |
278 | g_free(desc); | |
279 | } | |
280 | ||
281 | SR_PRIV int sr_bt_config_cb_scan(struct sr_bt_desc *desc, | |
282 | sr_bt_scan_cb cb, void *cb_data) | |
283 | { | |
284 | if (!desc) | |
285 | return -1; | |
286 | ||
287 | desc->scan_cb = cb; | |
288 | desc->scan_cb_data = cb_data; | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | SR_PRIV int sr_bt_config_cb_data(struct sr_bt_desc *desc, | |
294 | sr_bt_data_cb cb, void *cb_data) | |
295 | { | |
296 | if (!desc) | |
297 | return -1; | |
298 | ||
299 | desc->data_cb = cb; | |
300 | desc->data_cb_data = cb_data; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | SR_PRIV int sr_bt_config_addr_local(struct sr_bt_desc *desc, const char *addr) | |
306 | { | |
307 | bdaddr_t mac_bytes; | |
308 | int rc; | |
309 | ||
310 | if (!desc) | |
311 | return -1; | |
312 | ||
313 | if (!addr || !addr[0]) { | |
314 | desc->local_addr[0] = '\0'; | |
315 | return 0; | |
316 | } | |
317 | ||
318 | rc = sr_bt_mac_text_to_bytes(addr, &mac_bytes.b[0]); | |
319 | if (rc < 0) | |
320 | return -1; | |
321 | ||
322 | rc = ba2str(&mac_bytes, desc->local_addr); | |
323 | if (rc < 0) | |
324 | return -1; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | SR_PRIV int sr_bt_config_addr_remote(struct sr_bt_desc *desc, const char *addr) | |
330 | { | |
331 | bdaddr_t mac_bytes; | |
332 | int rc; | |
333 | ||
334 | if (!desc) | |
335 | return -1; | |
336 | ||
337 | if (!addr || !addr[0]) { | |
338 | desc->remote_addr[0] = '\0'; | |
339 | return 0; | |
340 | } | |
341 | ||
342 | rc = sr_bt_mac_text_to_bytes(addr, &mac_bytes.b[0]); | |
343 | if (rc < 0) | |
344 | return -1; | |
345 | ||
346 | rc = ba2str(&mac_bytes, desc->remote_addr); | |
347 | if (rc < 0) | |
348 | return -1; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | SR_PRIV int sr_bt_config_rfcomm(struct sr_bt_desc *desc, size_t channel) | |
354 | { | |
355 | if (!desc) | |
356 | return -1; | |
357 | ||
358 | desc->rfcomm_channel = channel; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | SR_PRIV int sr_bt_config_notify(struct sr_bt_desc *desc, | |
364 | uint16_t read_handle, uint16_t write_handle, | |
25d7c995 GS |
365 | uint16_t cccd_handle, uint16_t cccd_value, |
366 | uint16_t ble_mtu) | |
7c8ae47d GS |
367 | { |
368 | ||
369 | if (!desc) | |
370 | return -1; | |
371 | ||
372 | desc->read_handle = read_handle; | |
373 | desc->write_handle = write_handle; | |
374 | desc->cccd_handle = cccd_handle; | |
375 | desc->cccd_value = cccd_value; | |
25d7c995 | 376 | desc->ble_mtu = ble_mtu; |
7c8ae47d GS |
377 | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int sr_bt_desc_open(struct sr_bt_desc *desc, int *id_ref) | |
382 | { | |
383 | int id, sock; | |
384 | bdaddr_t mac; | |
385 | ||
386 | if (!desc) | |
387 | return -1; | |
388 | sr_dbg("BLE open"); | |
389 | ||
7c8ae47d GS |
390 | if (desc->local_addr[0]) { |
391 | id = hci_devid(desc->local_addr); | |
392 | } else if (desc->remote_addr[0]) { | |
393 | str2ba(desc->remote_addr, &mac); | |
394 | id = hci_get_route(&mac); | |
395 | } else { | |
396 | id = hci_get_route(NULL); | |
397 | } | |
398 | if (id < 0) { | |
0f92d5db | 399 | sr_err("devid failed"); |
7c8ae47d GS |
400 | return -1; |
401 | } | |
402 | desc->devid = id; | |
403 | if (id_ref) | |
404 | *id_ref = id; | |
405 | ||
7c8ae47d GS |
406 | sock = hci_open_dev(id); |
407 | if (sock < 0) { | |
408 | perror("open HCI socket"); | |
409 | return -1; | |
410 | } | |
411 | desc->fd = sock; | |
412 | ||
413 | return sock; | |
414 | } | |
415 | ||
416 | static void sr_bt_desc_close(struct sr_bt_desc *desc) | |
417 | { | |
418 | if (!desc) | |
419 | return; | |
420 | ||
421 | sr_dbg("BLE close"); | |
422 | if (desc->fd >= 0) { | |
423 | hci_close_dev(desc->fd); | |
424 | desc->fd = -1; | |
425 | } | |
426 | desc->devid = -1; | |
427 | } | |
428 | ||
429 | /* }}} descriptor */ | |
430 | /* {{{ scan */ | |
431 | ||
432 | #define EIR_NAME_COMPLETE 9 | |
433 | ||
434 | static int sr_bt_scan_prep(struct sr_bt_desc *desc) | |
435 | { | |
436 | int rc; | |
437 | uint8_t type, owntype, filter; | |
438 | uint16_t ival, window; | |
439 | int timeout; | |
440 | uint8_t enable, dup; | |
441 | socklen_t slen; | |
442 | struct hci_filter scan_filter; | |
443 | ||
444 | if (!desc) | |
445 | return -1; | |
7c8ae47d GS |
446 | |
447 | /* TODO Replace magic values with symbolic identifiers. */ | |
7c8ae47d GS |
448 | type = 0x01; /* LE public? */ |
449 | ival = htobs(0x0010); | |
450 | window = htobs(0x0010); | |
451 | owntype = 0x00; /* any? */ | |
452 | filter = 0x00; | |
453 | timeout = 1000; | |
454 | rc = hci_le_set_scan_parameters(desc->fd, | |
455 | type, ival, window, owntype, filter, timeout); | |
456 | if (rc < 0) { | |
457 | perror("set LE scan params"); | |
458 | return -1; | |
459 | } | |
460 | ||
7c8ae47d GS |
461 | enable = 1; |
462 | dup = 1; | |
463 | timeout = 1000; | |
464 | rc = hci_le_set_scan_enable(desc->fd, enable, dup, timeout); | |
465 | if (rc < 0) { | |
466 | perror("set LE scan enable"); | |
467 | return -1; | |
468 | } | |
469 | ||
470 | /* Save the current filter. For later restoration. */ | |
7c8ae47d GS |
471 | slen = sizeof(desc->orig_filter); |
472 | rc = getsockopt(desc->fd, SOL_HCI, HCI_FILTER, | |
473 | &desc->orig_filter, &slen); | |
474 | if (rc < 0) { | |
475 | perror("getsockopt(HCI_FILTER)"); | |
476 | return -1; | |
477 | } | |
478 | ||
7c8ae47d GS |
479 | hci_filter_clear(&scan_filter); |
480 | hci_filter_set_ptype(HCI_EVENT_PKT, &scan_filter); | |
481 | hci_filter_set_event(EVT_LE_META_EVENT, &scan_filter); | |
482 | rc = setsockopt(desc->fd, SOL_HCI, HCI_FILTER, | |
483 | &scan_filter, sizeof(scan_filter)); | |
484 | if (rc < 0) { | |
485 | perror("setsockopt(HCI_FILTER)"); | |
486 | return -1; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static int sr_bt_scan_post(struct sr_bt_desc *desc) | |
493 | { | |
494 | int rc; | |
495 | uint8_t enable, dup; | |
496 | int timeout; | |
497 | ||
498 | if (!desc) | |
499 | return -1; | |
7c8ae47d GS |
500 | |
501 | /* Restore previous HCI filter. */ | |
7c8ae47d GS |
502 | rc = setsockopt(desc->fd, SOL_HCI, HCI_FILTER, |
503 | &desc->orig_filter, sizeof(desc->orig_filter)); | |
504 | if (rc < 0) { | |
505 | perror("setsockopt(HCI_FILTER)"); | |
506 | return -1; | |
507 | } | |
508 | ||
7c8ae47d GS |
509 | enable = 0; |
510 | dup = 1; | |
511 | timeout = 1000; | |
512 | rc = hci_le_set_scan_enable(desc->fd, enable, dup, timeout); | |
513 | if (rc < 0) | |
514 | return -1; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | static int sr_bt_scan_proc(struct sr_bt_desc *desc, | |
520 | sr_bt_scan_cb scan_cb, void *cb_data, | |
521 | uint8_t *data, size_t dlen, le_advertising_info *info) | |
522 | { | |
523 | uint8_t type; | |
524 | char addr[20]; | |
525 | const char *name; | |
526 | ||
527 | (void)desc; | |
528 | ||
529 | type = data[0]; | |
530 | if (type == EIR_NAME_COMPLETE) { | |
531 | ba2str(&info->bdaddr, addr); | |
532 | name = g_strndup((const char *)&data[1], dlen - 1); | |
533 | if (scan_cb) | |
534 | scan_cb(cb_data, addr, name); | |
535 | free((void *)name); | |
536 | return 0; | |
537 | } | |
538 | ||
539 | /* Unknown or unsupported type, ignore silently. */ | |
540 | return 0; | |
541 | } | |
542 | ||
543 | SR_PRIV int sr_bt_scan_le(struct sr_bt_desc *desc, int duration) | |
544 | { | |
545 | int rc; | |
546 | time_t deadline; | |
547 | uint8_t buf[HCI_MAX_EVENT_SIZE]; | |
548 | ssize_t rdlen, rdpos; | |
549 | evt_le_meta_event *meta; | |
550 | le_advertising_info *info; | |
551 | uint8_t *dataptr; | |
552 | size_t datalen; | |
553 | ||
554 | if (!desc) | |
555 | return -1; | |
556 | sr_dbg("BLE scan (LE)"); | |
557 | ||
7c8ae47d GS |
558 | rc = sr_bt_desc_open(desc, NULL); |
559 | if (rc < 0) | |
560 | return -1; | |
561 | ||
7c8ae47d GS |
562 | rc = sr_bt_scan_prep(desc); |
563 | if (rc < 0) | |
564 | return -1; | |
565 | ||
7c8ae47d GS |
566 | deadline = time(NULL); |
567 | deadline += duration; | |
568 | while (time(NULL) <= deadline) { | |
569 | ||
570 | if (sr_bt_check_socket_usable(desc) < 0) | |
571 | break; | |
572 | rdlen = sr_bt_read(desc, buf, sizeof(buf)); | |
573 | if (rdlen < 0) | |
574 | break; | |
575 | if (!rdlen) { | |
7c8ae47d | 576 | g_usleep(50000); |
7c8ae47d GS |
577 | continue; |
578 | } | |
579 | if (rdlen < 1 + HCI_EVENT_HDR_SIZE) | |
580 | continue; | |
581 | meta = (void *)&buf[1 + HCI_EVENT_HDR_SIZE]; | |
582 | rdlen -= 1 + HCI_EVENT_HDR_SIZE; | |
583 | if (meta->subevent != EVT_LE_ADVERTISING_REPORT) | |
584 | continue; | |
585 | info = (void *)&meta->data[1]; | |
586 | sr_spew("evt: type %d, len %d", info->evt_type, info->length); | |
587 | if (!info->length) | |
588 | continue; | |
589 | ||
590 | rdpos = 0; | |
591 | while (rdpos < rdlen) { | |
592 | datalen = info->data[rdpos]; | |
593 | dataptr = &info->data[1 + rdpos]; | |
594 | if (rdpos + 1 + datalen > info->length) | |
595 | break; | |
596 | rdpos += 1 + datalen; | |
597 | rc = sr_bt_scan_proc(desc, | |
598 | desc->scan_cb, desc->scan_cb_data, | |
599 | dataptr, datalen, info); | |
600 | if (rc < 0) | |
601 | break; | |
602 | } | |
603 | } | |
604 | ||
7c8ae47d GS |
605 | rc = sr_bt_scan_post(desc); |
606 | if (rc < 0) | |
607 | return -1; | |
608 | ||
609 | sr_bt_desc_close(desc); | |
610 | ||
611 | return 0; | |
612 | } | |
613 | ||
614 | SR_PRIV int sr_bt_scan_bt(struct sr_bt_desc *desc, int duration) | |
615 | { | |
616 | int dev_id, sock, rsp_max; | |
617 | long flags; | |
618 | inquiry_info *info; | |
619 | int inq_rc; | |
620 | size_t rsp_count, idx; | |
621 | char addr[20]; | |
622 | char name[256]; | |
623 | ||
624 | if (!desc) | |
625 | return -1; | |
626 | sr_dbg("BLE scan (BT)"); | |
627 | ||
628 | sock = sr_bt_desc_open(desc, &dev_id); | |
629 | if (sock < 0) | |
630 | return -1; | |
631 | ||
632 | rsp_max = 255; | |
633 | info = g_malloc0(rsp_max * sizeof(*info)); | |
634 | flags = 0 /* | IREQ_CACHE_FLUSH */; | |
635 | inq_rc = hci_inquiry(dev_id, duration, rsp_max, NULL, &info, flags); | |
636 | if (inq_rc < 0) | |
637 | perror("hci_inquiry"); | |
638 | rsp_count = inq_rc; | |
639 | ||
640 | for (idx = 0; idx < rsp_count; idx++) { | |
641 | memset(addr, 0, sizeof(addr)); | |
642 | ba2str(&info[idx].bdaddr, addr); | |
643 | memset(name, 0, sizeof(name)); | |
644 | if (hci_read_remote_name(sock, &info[idx].bdaddr, sizeof(name), name, 0) < 0) | |
645 | snprintf(name, sizeof(name), "[unknown]"); | |
646 | if (desc->scan_cb) | |
647 | desc->scan_cb(desc->scan_cb_data, addr, name); | |
648 | } | |
649 | g_free(info); | |
650 | ||
651 | sr_bt_desc_close(desc); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | /* }}} scan */ | |
657 | /* {{{ connect/disconnect */ | |
658 | ||
659 | SR_PRIV int sr_bt_connect_ble(struct sr_bt_desc *desc) | |
660 | { | |
661 | struct sockaddr_l2 sl2; | |
662 | bdaddr_t mac; | |
663 | int s, ret; | |
113de3a5 | 664 | gint64 deadline; |
7c8ae47d GS |
665 | |
666 | if (!desc) | |
667 | return -1; | |
668 | if (!desc->remote_addr[0]) | |
669 | return -1; | |
670 | sr_dbg("BLE connect, remote addr %s", desc->remote_addr); | |
671 | ||
7c8ae47d GS |
672 | s = socket(AF_BLUETOOTH, SOCK_SEQPACKET, 0); |
673 | if (s < 0) { | |
674 | perror("socket create"); | |
675 | return s; | |
676 | } | |
677 | desc->fd = s; | |
678 | ||
7c8ae47d GS |
679 | memset(&sl2, 0, sizeof(sl2)); |
680 | sl2.l2_family = AF_BLUETOOTH; | |
681 | sl2.l2_psm = 0; | |
682 | if (desc->local_addr[0]) | |
683 | str2ba(desc->local_addr, &mac); | |
684 | else | |
685 | mac = *BDADDR_ANY; | |
686 | memcpy(&sl2.l2_bdaddr, &mac, sizeof(sl2.l2_bdaddr)); | |
687 | sl2.l2_cid = L2CAP_FC_CONNLESS; | |
688 | sl2.l2_bdaddr_type = BDADDR_LE_PUBLIC; | |
689 | ret = bind(s, (void *)&sl2, sizeof(sl2)); | |
690 | if (ret < 0) { | |
691 | perror("bind"); | |
692 | return ret; | |
693 | } | |
694 | ||
695 | if (0) { | |
696 | struct bt_security buf = { | |
697 | .level = BT_SECURITY_LOW, | |
698 | .key_size = 0, | |
699 | }; | |
7c8ae47d GS |
700 | ret = setsockopt(s, SOL_BLUETOOTH, BT_SECURITY, &buf, sizeof(buf)); |
701 | if (ret < 0) { | |
702 | perror("setsockopt"); | |
703 | return ret; | |
704 | } | |
705 | } | |
706 | ||
113de3a5 GS |
707 | deadline = g_get_monotonic_time(); |
708 | deadline += CONNECT_BLE_TIMEOUT * 1000 * 1000; | |
7c8ae47d GS |
709 | str2ba(desc->remote_addr, &mac); |
710 | memcpy(&sl2.l2_bdaddr, &mac, sizeof(sl2.l2_bdaddr)); | |
711 | sl2.l2_bdaddr_type = BDADDR_LE_PUBLIC; | |
712 | ret = connect(s, (void *)&sl2, sizeof(sl2)); | |
713 | /* | |
714 | * Cope with "in progress" condition. Keep polling the status | |
715 | * until connect() completes, then get the error by means of | |
716 | * getsockopt(). See the connect(2) manpage for details. | |
717 | */ | |
718 | if (ret < 0 && errno == EINPROGRESS) { | |
719 | struct pollfd fds[1]; | |
720 | uint32_t soerror; | |
721 | socklen_t solen; | |
722 | ||
723 | /* TODO | |
724 | * We seem to get here ("connect in progress") even when | |
725 | * the specified peer is not around at all. Which results | |
726 | * in extended periods of time where nothing happens, and | |
727 | * an application timeout seems to be required. | |
728 | */ | |
729 | sr_spew("in progress ..."); | |
730 | ||
731 | do { | |
7c8ae47d GS |
732 | memset(fds, 0, sizeof(fds)); |
733 | fds[0].fd = s; | |
734 | fds[0].events = POLLOUT; | |
735 | ret = poll(fds, ARRAY_SIZE(fds), -1); | |
736 | if (ret < 0) { | |
737 | perror("poll(OUT)"); | |
738 | return ret; | |
739 | } | |
740 | if (!ret) | |
741 | continue; | |
742 | if (!(fds[0].revents & POLLOUT)) | |
743 | continue; | |
113de3a5 GS |
744 | if (g_get_monotonic_time() >= deadline) { |
745 | sr_warn("Connect attempt timed out"); | |
746 | return SR_ERR_IO; | |
747 | } | |
7c8ae47d | 748 | } while (1); |
7c8ae47d GS |
749 | memset(fds, 0, sizeof(fds)); |
750 | fds[0].fd = s; | |
751 | fds[0].events = POLLNVAL; | |
752 | ret = poll(fds, 1, 0); | |
753 | if (ret < 0) { | |
754 | perror("poll(INVAL)"); | |
755 | return ret; | |
756 | } | |
757 | if (ret) { | |
758 | /* socket fd is invalid(?) */ | |
759 | desc->fd = -1; | |
760 | close(s); | |
761 | return -1; | |
762 | } | |
7c8ae47d GS |
763 | solen = sizeof(soerror); |
764 | ret = getsockopt(s, SOL_SOCKET, SO_ERROR, &soerror, &solen); | |
765 | if (ret < 0) { | |
766 | perror("getsockopt(SO_ERROR)"); | |
767 | return ret; | |
768 | } | |
769 | if (soerror) { | |
770 | /* connect(2) failed, SO_ERROR has the error code. */ | |
771 | errno = soerror; | |
772 | perror("connect(PROGRESS)"); | |
773 | return soerror; | |
774 | } | |
775 | ||
776 | /* | |
777 | * TODO Get the receive MTU here? | |
778 | * getsockopt(SOL_BLUETOOTH, BT_RCVMTU, u16); | |
779 | */ | |
780 | } | |
7c8ae47d GS |
781 | if (ret < 0) { |
782 | perror("connect"); | |
783 | return ret; | |
784 | } | |
785 | ||
786 | return 0; | |
787 | } | |
788 | ||
789 | SR_PRIV int sr_bt_connect_rfcomm(struct sr_bt_desc *desc) | |
790 | { | |
791 | struct sockaddr_rc addr; | |
4704f645 | 792 | int i, fd, rc; |
7c8ae47d GS |
793 | |
794 | if (!desc) | |
795 | return -1; | |
796 | if (!desc->remote_addr[0]) | |
797 | return -1; | |
798 | sr_dbg("RFCOMM connect, remote addr %s, channel %zu", | |
799 | desc->remote_addr, desc->rfcomm_channel); | |
800 | ||
801 | if (!desc->rfcomm_channel) | |
802 | desc->rfcomm_channel = 1; | |
803 | ||
7c8ae47d GS |
804 | memset(&addr, 0, sizeof(addr)); |
805 | addr.rc_family = AF_BLUETOOTH; | |
806 | str2ba(desc->remote_addr, &addr.rc_bdaddr); | |
807 | addr.rc_channel = desc->rfcomm_channel; | |
4704f645 AS |
808 | |
809 | /* | |
810 | * There are cases where connect returns EBUSY if we are re-connecting | |
811 | * to a device. Try multiple times to work around this issue. | |
812 | */ | |
813 | for (i = 0; i < CONNECT_RFCOMM_TRIES; i++) { | |
814 | fd = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); | |
815 | if (fd < 0) { | |
816 | perror("socket"); | |
817 | return -1; | |
818 | } | |
819 | ||
820 | rc = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
821 | if (rc >= 0) { | |
822 | sr_spew("connected"); | |
823 | desc->fd = fd; | |
824 | return 0; | |
825 | } else if (rc < 0 && errno == EBUSY) { | |
826 | close(fd); | |
827 | g_usleep(CONNECT_RFCOMM_RETRY_MS * 1000); | |
828 | } else { | |
829 | close(fd); | |
830 | perror("connect"); | |
831 | return -2; | |
832 | } | |
7c8ae47d | 833 | } |
7c8ae47d | 834 | |
4704f645 AS |
835 | sr_err("Connect failed, device busy."); |
836 | ||
837 | return -2; | |
7c8ae47d GS |
838 | } |
839 | ||
840 | SR_PRIV void sr_bt_disconnect(struct sr_bt_desc *desc) | |
841 | { | |
842 | sr_dbg("BLE disconnect"); | |
843 | ||
844 | if (!desc) | |
845 | return; | |
846 | sr_bt_desc_close(desc); | |
847 | } | |
848 | ||
849 | static int sr_bt_check_socket_usable(struct sr_bt_desc *desc) | |
850 | { | |
851 | struct pollfd fds[1]; | |
852 | int ret; | |
853 | ||
7c8ae47d GS |
854 | if (!desc) |
855 | return -1; | |
856 | if (desc->fd < 0) | |
857 | return -1; | |
858 | ||
859 | memset(fds, 0, sizeof(fds)); | |
860 | fds[0].fd = desc->fd; | |
861 | fds[0].events = POLLERR | POLLHUP; | |
862 | ret = poll(fds, ARRAY_SIZE(fds), 0); | |
863 | if (ret < 0) | |
864 | return ret; | |
865 | if (!ret) | |
866 | return 0; | |
867 | if (fds[0].revents & POLLHUP) | |
868 | return -1; | |
869 | if (fds[0].revents & POLLERR) | |
870 | return -2; | |
871 | if (fds[0].revents & POLLNVAL) | |
872 | return -3; | |
873 | ||
874 | return 0; | |
875 | } | |
876 | ||
877 | /* }}} connect/disconnect */ | |
878 | /* {{{ indication/notification */ | |
879 | ||
880 | SR_PRIV int sr_bt_start_notify(struct sr_bt_desc *desc) | |
881 | { | |
882 | uint8_t buf[sizeof(desc->cccd_value)]; | |
883 | ssize_t wrlen; | |
884 | ||
885 | if (!desc) | |
886 | return -1; | |
887 | sr_dbg("BLE start notify"); | |
888 | ||
889 | if (sr_bt_check_socket_usable(desc) < 0) | |
890 | return -2; | |
891 | ||
3b13990f | 892 | write_u16le(buf, desc->cccd_value); |
7c8ae47d GS |
893 | wrlen = sr_bt_char_write_req(desc, desc->cccd_handle, buf, sizeof(buf)); |
894 | if (wrlen != sizeof(buf)) | |
895 | return -2; | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | SR_PRIV int sr_bt_check_notify(struct sr_bt_desc *desc) | |
901 | { | |
902 | uint8_t buf[1024]; | |
903 | ssize_t rdlen; | |
a8b0e6f5 GS |
904 | const uint8_t *bufptr; |
905 | size_t buflen; | |
7c8ae47d GS |
906 | uint8_t packet_type; |
907 | uint16_t packet_handle; | |
908 | uint8_t *packet_data; | |
909 | size_t packet_dlen; | |
a8b0e6f5 GS |
910 | const char *type_text; |
911 | int ret; | |
25d7c995 | 912 | uint16_t mtu; |
7c8ae47d | 913 | |
7c8ae47d GS |
914 | if (!desc) |
915 | return -1; | |
916 | ||
917 | if (sr_bt_check_socket_usable(desc) < 0) | |
918 | return -2; | |
919 | ||
a8b0e6f5 GS |
920 | /* |
921 | * Get another message from the Bluetooth socket. | |
922 | * | |
923 | * TODO Can we assume that every "message" comes in a separate | |
924 | * read(2) call, or can data combine at the caller's? Need we | |
925 | * loop over the received content until all was consumed? | |
926 | */ | |
7c8ae47d | 927 | rdlen = sr_bt_read(desc, buf, sizeof(buf)); |
a8b0e6f5 GS |
928 | if (rdlen < 0) { |
929 | sr_dbg("check notifiy, read error, %zd", rdlen); | |
7c8ae47d | 930 | return -2; |
a8b0e6f5 GS |
931 | } |
932 | if (!rdlen) { | |
933 | if (0) sr_spew("check notifiy, empty read"); | |
7c8ae47d | 934 | return 0; |
a8b0e6f5 GS |
935 | } |
936 | bufptr = &buf[0]; | |
937 | buflen = (size_t)rdlen; | |
938 | if (sr_log_loglevel_get() >= SR_LOG_SPEW) { | |
939 | GString *txt; | |
940 | txt = sr_hexdump_new(bufptr, buflen); | |
941 | sr_spew("check notifiy, read succes, length %zd, data: %s", | |
942 | rdlen, txt->str); | |
943 | sr_hexdump_free(txt); | |
944 | } | |
7c8ae47d | 945 | |
a8b0e6f5 GS |
946 | /* |
947 | * Get header fields and references to the payload data. Notice | |
948 | * that the first 16bit item after the packet type often is the | |
949 | * handle, but need not always be. That is why the read position | |
950 | * is kept, so that individual packet type handlers can either | |
951 | * read _their_ layout strictly sequentially, or can conveniently | |
952 | * access what a common preparation step has provided to them. | |
953 | */ | |
7c8ae47d GS |
954 | packet_handle = 0x0000; |
955 | packet_data = NULL; | |
956 | packet_dlen = 0; | |
a8b0e6f5 GS |
957 | packet_type = read_u8_inc_len(&bufptr, &buflen); |
958 | if (buflen >= sizeof(uint16_t)) { | |
959 | packet_handle = read_u16le(bufptr); | |
960 | packet_data = (void *)&bufptr[sizeof(uint16_t)]; | |
961 | packet_dlen = buflen - sizeof(uint16_t); | |
962 | if (!packet_dlen) | |
963 | packet_data = NULL; | |
7c8ae47d | 964 | } |
a8b0e6f5 GS |
965 | if (0) sr_spew("check notifiy, prep, hdl %" PRIu16 ", data %p len %zu", |
966 | packet_handle, packet_data, packet_dlen); | |
7c8ae47d GS |
967 | |
968 | /* Dispatch according to the message type. */ | |
969 | switch (packet_type) { | |
25d7c995 GS |
970 | case BLE_ATT_EXCHANGE_MTU_REQ: |
971 | type_text = "MTU exchange request"; | |
972 | if (buflen < sizeof(uint16_t)) { | |
973 | sr_dbg("%s, invalid (size)", type_text); | |
974 | break; | |
975 | } | |
976 | mtu = read_u16le_inc_len(&bufptr, &buflen); | |
977 | sr_dbg("%s, peripheral value %" PRIu16, type_text, mtu); | |
978 | if (desc->ble_mtu) { | |
979 | mtu = desc->ble_mtu; | |
980 | sr_dbg("%s, central value %" PRIu16, type_text, mtu); | |
981 | sr_bt_write_type_handle(desc, | |
982 | BLE_ATT_EXCHANGE_MTU_RESP, mtu); | |
983 | break; | |
984 | } | |
985 | sr_warn("Unhandled BLE %s.", type_text); | |
986 | break; | |
7c8ae47d | 987 | case BLE_ATT_ERROR_RESP: |
a8b0e6f5 GS |
988 | type_text = "error response"; |
989 | if (!buflen) { | |
990 | sr_dbg("%s, no payload", type_text); | |
991 | break; | |
992 | } | |
7c8ae47d | 993 | /* EMPTY */ |
a8b0e6f5 | 994 | sr_dbg("%s, not handled here", type_text); |
7c8ae47d GS |
995 | break; |
996 | case BLE_ATT_WRITE_RESP: | |
a8b0e6f5 GS |
997 | type_text = "write response"; |
998 | sr_dbg("%s, note taken", type_text); | |
7c8ae47d GS |
999 | break; |
1000 | case BLE_ATT_HANDLE_INDICATION: | |
a8b0e6f5 GS |
1001 | type_text = "handle indication"; |
1002 | sr_dbg("%s, data len %zu", type_text, packet_dlen); | |
7c8ae47d | 1003 | sr_bt_write_type(desc, BLE_ATT_HANDLE_CONFIRMATION); |
a8b0e6f5 | 1004 | sr_spew("%s, confirmation sent", type_text); |
7c8ae47d GS |
1005 | if (packet_handle != desc->read_handle) |
1006 | return -4; | |
7c8ae47d GS |
1007 | if (!desc->data_cb) |
1008 | return 0; | |
a8b0e6f5 GS |
1009 | ret = desc->data_cb(desc->data_cb_data, |
1010 | packet_data, packet_dlen); | |
1011 | sr_spew("%s, data cb ret %d", type_text, ret); | |
1012 | return ret; | |
7c8ae47d | 1013 | case BLE_ATT_HANDLE_NOTIFICATION: |
a8b0e6f5 GS |
1014 | type_text = "handle notification"; |
1015 | sr_dbg("%s, data len %zu", type_text, packet_dlen); | |
7c8ae47d GS |
1016 | if (packet_handle != desc->read_handle) |
1017 | return -4; | |
7c8ae47d GS |
1018 | if (!desc->data_cb) |
1019 | return 0; | |
a8b0e6f5 GS |
1020 | ret = desc->data_cb(desc->data_cb_data, |
1021 | packet_data, packet_dlen); | |
1022 | sr_spew("%s, data cb ret %d", type_text, ret); | |
1023 | return ret; | |
7c8ae47d | 1024 | default: |
a8b0e6f5 GS |
1025 | sr_dbg("unhandled type 0x%02x, len %zu", |
1026 | packet_type, buflen); | |
7c8ae47d GS |
1027 | return -3; |
1028 | } | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | /* }}} indication/notification */ | |
1034 | /* {{{ read/write */ | |
1035 | ||
1036 | SR_PRIV ssize_t sr_bt_write(struct sr_bt_desc *desc, | |
1037 | const void *data, size_t len) | |
1038 | { | |
7c8ae47d GS |
1039 | if (!desc) |
1040 | return -1; | |
1041 | if (desc->fd < 0) | |
1042 | return -1; | |
1043 | ||
1044 | if (sr_bt_check_socket_usable(desc) < 0) | |
1045 | return -2; | |
1046 | ||
1047 | /* Send TX data to the writable characteristics for BLE UART services. */ | |
1048 | if (desc->write_handle) | |
1049 | return sr_bt_char_write_req(desc, desc->write_handle, data, len); | |
1050 | ||
1051 | /* Send raw TX data to the RFCOMM socket for BT Classic channels. */ | |
1052 | return write(desc->fd, data, len); | |
1053 | } | |
1054 | ||
1055 | static ssize_t sr_bt_write_type(struct sr_bt_desc *desc, uint8_t type) | |
1056 | { | |
1057 | ssize_t wrlen; | |
1058 | ||
7c8ae47d GS |
1059 | if (!desc) |
1060 | return -1; | |
1061 | if (desc->fd < 0) | |
1062 | return -1; | |
1063 | ||
1064 | if (sr_bt_check_socket_usable(desc) < 0) | |
1065 | return -2; | |
1066 | ||
1067 | wrlen = write(desc->fd, &type, sizeof(type)); | |
1068 | if (wrlen < 0) | |
1069 | return wrlen; | |
1070 | if (wrlen < (ssize_t)sizeof(type)) | |
1071 | return -1; | |
1072 | ||
1073 | return 0; | |
1074 | } | |
1075 | ||
7c8ae47d GS |
1076 | static ssize_t sr_bt_write_type_handle(struct sr_bt_desc *desc, |
1077 | uint8_t type, uint16_t handle) | |
1078 | { | |
7c8ae47d GS |
1079 | return sr_bt_write_type_handle_bytes(desc, type, handle, NULL, 0); |
1080 | } | |
7c8ae47d GS |
1081 | |
1082 | static ssize_t sr_bt_write_type_handle_bytes(struct sr_bt_desc *desc, | |
1083 | uint8_t type, uint16_t handle, const uint8_t *data, size_t len) | |
1084 | { | |
1085 | uint8_t header[sizeof(uint8_t) + sizeof(uint16_t)]; | |
1086 | struct iovec iov[2] = { | |
1087 | { .iov_base = header, .iov_len = sizeof(header), }, | |
1088 | { .iov_base = (void *)data, .iov_len = len, }, | |
1089 | }; | |
1090 | ssize_t wrlen; | |
1091 | ||
7c8ae47d GS |
1092 | if (!desc) |
1093 | return -1; | |
1094 | if (desc->fd < 0) | |
1095 | return -1; | |
1096 | ||
1097 | if (sr_bt_check_socket_usable(desc) < 0) | |
1098 | return -2; | |
1099 | ||
1100 | header[0] = type; | |
3b13990f | 1101 | write_u16le(&header[1], handle); |
7c8ae47d GS |
1102 | |
1103 | if (data && len) | |
1104 | wrlen = writev(desc->fd, iov, ARRAY_SIZE(iov)); | |
1105 | else | |
1106 | wrlen = write(desc->fd, header, sizeof(header)); | |
1107 | ||
1108 | if (wrlen < 0) | |
1109 | return wrlen; | |
1110 | if (wrlen < (ssize_t)sizeof(header)) | |
1111 | return -1; | |
1112 | wrlen -= sizeof(header); | |
1113 | ||
1114 | return wrlen; | |
1115 | } | |
1116 | ||
1117 | /* Returns negative upon error, or returns the number of _payload_ bytes written. */ | |
1118 | static ssize_t sr_bt_char_write_req(struct sr_bt_desc *desc, | |
1119 | uint16_t handle, const void *data, size_t len) | |
1120 | { | |
7c8ae47d GS |
1121 | return sr_bt_write_type_handle_bytes(desc, BLE_ATT_WRITE_REQ, |
1122 | handle, data, len); | |
1123 | } | |
1124 | ||
1125 | SR_PRIV ssize_t sr_bt_read(struct sr_bt_desc *desc, void *data, size_t len) | |
1126 | { | |
1127 | struct pollfd fds[1]; | |
1128 | int ret; | |
1129 | ssize_t rdlen; | |
1130 | ||
7c8ae47d GS |
1131 | if (!desc) |
1132 | return -1; | |
1133 | if (desc->fd < 0) | |
1134 | return -1; | |
1135 | ||
1136 | if (sr_bt_check_socket_usable(desc) < 0) | |
1137 | return -2; | |
1138 | ||
7c8ae47d GS |
1139 | memset(fds, 0, sizeof(fds)); |
1140 | fds[0].fd = desc->fd; | |
1141 | fds[0].events = POLLIN; | |
1142 | ret = poll(fds, ARRAY_SIZE(fds), 0); | |
7c8ae47d GS |
1143 | if (ret < 0) |
1144 | return ret; | |
1145 | if (!ret) | |
1146 | return 0; | |
1147 | if (!(fds[0].revents & POLLIN)) | |
1148 | return 0; | |
1149 | ||
7c8ae47d | 1150 | rdlen = read(desc->fd, data, len); |
7c8ae47d GS |
1151 | |
1152 | return rdlen; | |
1153 | } | |
1154 | ||
1155 | /* }}} indication/notification */ | |
1156 | ||
1157 | #endif |