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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> | |
77 | #include <poll.h> | |
78 | #include <stdarg.h> | |
79 | #include <stdio.h> | |
80 | #include <stdlib.h> | |
81 | #include <string.h> | |
684b26ef | 82 | #include <sys/uio.h> |
7c8ae47d GS |
83 | #include <sys/socket.h> |
84 | #include <time.h> | |
85 | #include <unistd.h> | |
86 | ||
87 | #include <libsigrok/libsigrok.h> | |
88 | #include "libsigrok-internal.h" | |
89 | ||
90 | /** @cond PRIVATE */ | |
91 | #define LOG_PREFIX "bt-bluez" | |
92 | /** @endcond */ | |
93 | ||
94 | #define STORE_MAC_REVERSE 1 | |
95 | #define ACCEPT_NONSEP_MAC 1 | |
96 | ||
97 | /* Silence warning about (currently) unused routine. */ | |
98 | #define WITH_WRITE_TYPE_HANDLE 0 | |
99 | ||
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 | ||
107 | #if !defined HAVE_BT_PUT_LE16 | |
108 | static inline void bt_put_le16(uint16_t v, uint8_t *p) | |
109 | { | |
110 | p[0] = (v >> 0) & 0xff; | |
111 | p[1] = (v >> 8) & 0xff; | |
112 | } | |
113 | #endif | |
114 | ||
115 | /* }}} compat decls */ | |
116 | /* {{{ Linux socket specific decls */ | |
117 | ||
118 | #define BLE_ATT_ERROR_RESP 0x01 | |
119 | #define BLE_ATT_EXCHANGE_MTU_REQ 0x02 | |
120 | #define BLE_ATT_EXCHANGE_MTU_RESP 0x03 | |
121 | #define BLE_ATT_FIND_INFORMATION_REQ 0x04 | |
122 | #define BLE_ATT_FIND_INFORMATION_RESP 0x05 | |
123 | #define BLE_ATT_FIND_BY_TYPE_REQ 0x06 | |
124 | #define BLE_ATT_FIND_BY_TYPE_RESP 0x07 | |
125 | #define BLE_ATT_READ_BY_TYPE_REQ 0x08 | |
126 | #define BLE_ATT_READ_BY_TYPE_RESP 0x09 | |
127 | #define BLE_ATT_READ_REQ 0x0a | |
128 | #define BLE_ATT_READ_RESP 0x0b | |
129 | #define BLE_ATT_READ_BLOB_REQ 0x0c | |
130 | #define BLE_ATT_READ_BLOB_RESP 0x0d | |
131 | #define BLE_ATT_READ_MULTIPLE_REQ 0x0e | |
132 | #define BLE_ATT_READ_MULTIPLE_RESP 0x0f | |
133 | #define BLE_ATT_READ_BY_GROUP_REQ 0x10 | |
134 | #define BLE_ATT_READ_BY_GROUP_RESP 0x11 | |
135 | #define BLE_ATT_WRITE_REQ 0x12 | |
136 | #define BLE_ATT_WRITE_RESP 0x13 | |
137 | #define BLE_ATT_WRITE_CMD 0x16 | |
138 | #define BLE_ATT_HANDLE_NOTIFICATION 0x1b | |
139 | #define BLE_ATT_HANDLE_INDICATION 0x1d | |
140 | #define BLE_ATT_HANDLE_CONFIRMATION 0x1e | |
141 | #define BLE_ATT_SIGNED_WRITE_CMD 0x52 | |
142 | ||
143 | /* }}} Linux socket specific decls */ | |
144 | /* {{{ conversion */ | |
145 | ||
146 | /* | |
147 | * Convert textual MAC presentation to array of bytes. In contrast to | |
148 | * BlueZ conversion, accept colon or dash separated input as well as a | |
149 | * dense format without separators (001122334455). We expect to use the | |
150 | * library in an environment where colons are not always available as a | |
151 | * separator in user provided specs, while users do want to use some | |
152 | * separator for readability. | |
153 | * | |
154 | * TODO Instead of doing the actual conversion here (and dealing with | |
155 | * BlueZ' internal byte order for device address bytes), we might as | |
156 | * well just transform the input string to an output string, and always | |
157 | * use the officially provided str2ba() conversion routine. | |
158 | */ | |
159 | static int sr_bt_mac_text_to_bytes(const char *text, uint8_t *buf) | |
160 | { | |
161 | size_t len; | |
162 | long v; | |
163 | char *endp; | |
164 | char numbuf[3]; | |
165 | ||
166 | len = 6; | |
167 | if (STORE_MAC_REVERSE) | |
168 | buf += len; | |
169 | endp = (char *)text; | |
170 | while (len && endp && *endp) { | |
171 | text = endp; | |
172 | if (ACCEPT_NONSEP_MAC) { | |
173 | numbuf[0] = endp[0]; | |
174 | numbuf[1] = endp[0] ? endp[1] : '\0'; | |
175 | numbuf[2] = '\0'; | |
176 | } | |
177 | endp = NULL; | |
178 | v = strtol(ACCEPT_NONSEP_MAC ? numbuf : text, &endp, 16); | |
179 | if (!endp) | |
180 | break; | |
181 | if (*endp != ':' && *endp != '-' && *endp != '\0') | |
182 | break; | |
183 | if (v < 0 || v > 255) | |
184 | break; | |
185 | if (STORE_MAC_REVERSE) | |
186 | *(--buf) = v; | |
187 | else | |
188 | *buf++ = v; | |
189 | len--; | |
190 | if (ACCEPT_NONSEP_MAC) | |
191 | endp = (char *)text + (endp - numbuf); | |
192 | if (*endp == ':' || *endp == '-') | |
193 | endp++; | |
194 | } | |
195 | ||
196 | if (len) { | |
197 | sr_err("Failed to parse MAC, too few bytes in '%s'", text); | |
198 | return -1; | |
199 | } | |
200 | while (isspace(*endp)) | |
201 | endp++; | |
202 | if (*endp) { | |
203 | sr_err("Failed to parse MAC, excess data in '%s'", text); | |
204 | return -1; | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | /* }}} conversion */ | |
211 | /* {{{ helpers */ | |
212 | ||
213 | SR_PRIV const char *sr_bt_adapter_get_address(size_t idx) | |
214 | { | |
215 | int rc; | |
216 | struct hci_dev_info info; | |
217 | char addr[20]; | |
218 | ||
219 | rc = hci_devinfo(idx, &info); | |
220 | sr_dbg("DIAG: hci_devinfo(%zu) => rc %d", idx, rc); | |
221 | if (rc < 0) | |
222 | return NULL; | |
223 | ||
224 | rc = ba2str(&info.bdaddr, addr); | |
225 | sr_dbg("DIAG: ba2str() => rc %d", rc); | |
226 | if (rc < 0) | |
227 | return NULL; | |
228 | ||
229 | return g_strdup(addr); | |
230 | } | |
231 | ||
232 | /* }}} helpers */ | |
233 | /* {{{ descriptor */ | |
234 | ||
235 | struct sr_bt_desc { | |
236 | /* User servicable options. */ | |
237 | sr_bt_scan_cb scan_cb; | |
238 | void *scan_cb_data; | |
239 | sr_bt_data_cb data_cb; | |
240 | void *data_cb_data; | |
241 | char local_addr[20]; | |
242 | char remote_addr[20]; | |
243 | size_t rfcomm_channel; | |
244 | uint16_t read_handle; | |
245 | uint16_t write_handle; | |
246 | uint16_t cccd_handle; | |
247 | uint16_t cccd_value; | |
248 | /* Internal state. */ | |
249 | int devid; | |
250 | int fd; | |
251 | struct hci_filter orig_filter; | |
252 | }; | |
253 | ||
254 | static int sr_bt_desc_open(struct sr_bt_desc *desc, int *id_ref); | |
255 | static void sr_bt_desc_close(struct sr_bt_desc *desc); | |
256 | static int sr_bt_check_socket_usable(struct sr_bt_desc *desc); | |
257 | static ssize_t sr_bt_write_type(struct sr_bt_desc *desc, uint8_t type); | |
258 | #if WITH_WRITE_TYPE_HANDLE | |
259 | static ssize_t sr_bt_write_type_handle(struct sr_bt_desc *desc, | |
260 | uint8_t type, uint16_t handle); | |
261 | #endif | |
262 | static ssize_t sr_bt_write_type_handle_bytes(struct sr_bt_desc *desc, | |
263 | uint8_t type, uint16_t handle, const uint8_t *data, size_t len); | |
264 | static ssize_t sr_bt_char_write_req(struct sr_bt_desc *desc, | |
265 | uint16_t handle, const void *data, size_t len); | |
266 | ||
267 | SR_PRIV struct sr_bt_desc *sr_bt_desc_new(void) | |
268 | { | |
269 | struct sr_bt_desc *desc; | |
270 | ||
271 | desc = g_malloc0(sizeof(*desc)); | |
272 | if (!desc) | |
273 | return NULL; | |
274 | ||
275 | desc->devid = -1; | |
276 | desc->fd = -1; | |
277 | ||
278 | return desc; | |
279 | } | |
280 | ||
281 | SR_PRIV void sr_bt_desc_free(struct sr_bt_desc *desc) | |
282 | { | |
283 | if (!desc) | |
284 | return; | |
285 | ||
286 | sr_bt_desc_close(desc); | |
287 | g_free(desc); | |
288 | } | |
289 | ||
290 | SR_PRIV int sr_bt_config_cb_scan(struct sr_bt_desc *desc, | |
291 | sr_bt_scan_cb cb, void *cb_data) | |
292 | { | |
293 | if (!desc) | |
294 | return -1; | |
295 | ||
296 | desc->scan_cb = cb; | |
297 | desc->scan_cb_data = cb_data; | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
302 | SR_PRIV int sr_bt_config_cb_data(struct sr_bt_desc *desc, | |
303 | sr_bt_data_cb cb, void *cb_data) | |
304 | { | |
305 | if (!desc) | |
306 | return -1; | |
307 | ||
308 | desc->data_cb = cb; | |
309 | desc->data_cb_data = cb_data; | |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | SR_PRIV int sr_bt_config_addr_local(struct sr_bt_desc *desc, const char *addr) | |
315 | { | |
316 | bdaddr_t mac_bytes; | |
317 | int rc; | |
318 | ||
319 | if (!desc) | |
320 | return -1; | |
321 | ||
322 | if (!addr || !addr[0]) { | |
323 | desc->local_addr[0] = '\0'; | |
324 | return 0; | |
325 | } | |
326 | ||
327 | rc = sr_bt_mac_text_to_bytes(addr, &mac_bytes.b[0]); | |
328 | if (rc < 0) | |
329 | return -1; | |
330 | ||
331 | rc = ba2str(&mac_bytes, desc->local_addr); | |
332 | if (rc < 0) | |
333 | return -1; | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
338 | SR_PRIV int sr_bt_config_addr_remote(struct sr_bt_desc *desc, const char *addr) | |
339 | { | |
340 | bdaddr_t mac_bytes; | |
341 | int rc; | |
342 | ||
343 | if (!desc) | |
344 | return -1; | |
345 | ||
346 | if (!addr || !addr[0]) { | |
347 | desc->remote_addr[0] = '\0'; | |
348 | return 0; | |
349 | } | |
350 | ||
351 | rc = sr_bt_mac_text_to_bytes(addr, &mac_bytes.b[0]); | |
352 | if (rc < 0) | |
353 | return -1; | |
354 | ||
355 | rc = ba2str(&mac_bytes, desc->remote_addr); | |
356 | if (rc < 0) | |
357 | return -1; | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | SR_PRIV int sr_bt_config_rfcomm(struct sr_bt_desc *desc, size_t channel) | |
363 | { | |
364 | if (!desc) | |
365 | return -1; | |
366 | ||
367 | desc->rfcomm_channel = channel; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | SR_PRIV int sr_bt_config_notify(struct sr_bt_desc *desc, | |
373 | uint16_t read_handle, uint16_t write_handle, | |
374 | uint16_t cccd_handle, uint16_t cccd_value) | |
375 | { | |
376 | ||
377 | if (!desc) | |
378 | return -1; | |
379 | ||
380 | desc->read_handle = read_handle; | |
381 | desc->write_handle = write_handle; | |
382 | desc->cccd_handle = cccd_handle; | |
383 | desc->cccd_value = cccd_value; | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static int sr_bt_desc_open(struct sr_bt_desc *desc, int *id_ref) | |
389 | { | |
390 | int id, sock; | |
391 | bdaddr_t mac; | |
392 | ||
393 | if (!desc) | |
394 | return -1; | |
395 | sr_dbg("BLE open"); | |
396 | ||
397 | sr_spew("get devid"); | |
398 | if (desc->local_addr[0]) { | |
399 | id = hci_devid(desc->local_addr); | |
400 | } else if (desc->remote_addr[0]) { | |
401 | str2ba(desc->remote_addr, &mac); | |
402 | id = hci_get_route(&mac); | |
403 | } else { | |
404 | id = hci_get_route(NULL); | |
405 | } | |
406 | if (id < 0) { | |
407 | sr_spew("devid failed"); | |
408 | return -1; | |
409 | } | |
410 | desc->devid = id; | |
411 | if (id_ref) | |
412 | *id_ref = id; | |
413 | ||
414 | sr_spew("open HCI socket"); | |
415 | sock = hci_open_dev(id); | |
416 | if (sock < 0) { | |
417 | perror("open HCI socket"); | |
418 | return -1; | |
419 | } | |
420 | desc->fd = sock; | |
421 | ||
422 | return sock; | |
423 | } | |
424 | ||
425 | static void sr_bt_desc_close(struct sr_bt_desc *desc) | |
426 | { | |
427 | if (!desc) | |
428 | return; | |
429 | ||
430 | sr_dbg("BLE close"); | |
431 | if (desc->fd >= 0) { | |
432 | hci_close_dev(desc->fd); | |
433 | desc->fd = -1; | |
434 | } | |
435 | desc->devid = -1; | |
436 | } | |
437 | ||
438 | /* }}} descriptor */ | |
439 | /* {{{ scan */ | |
440 | ||
441 | #define EIR_NAME_COMPLETE 9 | |
442 | ||
443 | static int sr_bt_scan_prep(struct sr_bt_desc *desc) | |
444 | { | |
445 | int rc; | |
446 | uint8_t type, owntype, filter; | |
447 | uint16_t ival, window; | |
448 | int timeout; | |
449 | uint8_t enable, dup; | |
450 | socklen_t slen; | |
451 | struct hci_filter scan_filter; | |
452 | ||
453 | if (!desc) | |
454 | return -1; | |
455 | sr_dbg("BLE scan prep"); | |
456 | ||
457 | /* TODO Replace magic values with symbolic identifiers. */ | |
458 | sr_spew("set LE scan params"); | |
459 | type = 0x01; /* LE public? */ | |
460 | ival = htobs(0x0010); | |
461 | window = htobs(0x0010); | |
462 | owntype = 0x00; /* any? */ | |
463 | filter = 0x00; | |
464 | timeout = 1000; | |
465 | rc = hci_le_set_scan_parameters(desc->fd, | |
466 | type, ival, window, owntype, filter, timeout); | |
467 | if (rc < 0) { | |
468 | perror("set LE scan params"); | |
469 | return -1; | |
470 | } | |
471 | ||
472 | sr_spew("set LE scan enable"); | |
473 | enable = 1; | |
474 | dup = 1; | |
475 | timeout = 1000; | |
476 | rc = hci_le_set_scan_enable(desc->fd, enable, dup, timeout); | |
477 | if (rc < 0) { | |
478 | perror("set LE scan enable"); | |
479 | return -1; | |
480 | } | |
481 | ||
482 | /* Save the current filter. For later restoration. */ | |
483 | sr_spew("get HCI filter"); | |
484 | slen = sizeof(desc->orig_filter); | |
485 | rc = getsockopt(desc->fd, SOL_HCI, HCI_FILTER, | |
486 | &desc->orig_filter, &slen); | |
487 | if (rc < 0) { | |
488 | perror("getsockopt(HCI_FILTER)"); | |
489 | return -1; | |
490 | } | |
491 | ||
492 | sr_spew("set HCI filter"); | |
493 | hci_filter_clear(&scan_filter); | |
494 | hci_filter_set_ptype(HCI_EVENT_PKT, &scan_filter); | |
495 | hci_filter_set_event(EVT_LE_META_EVENT, &scan_filter); | |
496 | rc = setsockopt(desc->fd, SOL_HCI, HCI_FILTER, | |
497 | &scan_filter, sizeof(scan_filter)); | |
498 | if (rc < 0) { | |
499 | perror("setsockopt(HCI_FILTER)"); | |
500 | return -1; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | static int sr_bt_scan_post(struct sr_bt_desc *desc) | |
507 | { | |
508 | int rc; | |
509 | uint8_t enable, dup; | |
510 | int timeout; | |
511 | ||
512 | if (!desc) | |
513 | return -1; | |
514 | sr_dbg("BLE scan post"); | |
515 | ||
516 | /* Restore previous HCI filter. */ | |
517 | sr_spew("set HCI filter"); | |
518 | rc = setsockopt(desc->fd, SOL_HCI, HCI_FILTER, | |
519 | &desc->orig_filter, sizeof(desc->orig_filter)); | |
520 | if (rc < 0) { | |
521 | perror("setsockopt(HCI_FILTER)"); | |
522 | return -1; | |
523 | } | |
524 | ||
525 | sr_spew("set LE scan enable"); | |
526 | enable = 0; | |
527 | dup = 1; | |
528 | timeout = 1000; | |
529 | rc = hci_le_set_scan_enable(desc->fd, enable, dup, timeout); | |
530 | if (rc < 0) | |
531 | return -1; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | static int sr_bt_scan_proc(struct sr_bt_desc *desc, | |
537 | sr_bt_scan_cb scan_cb, void *cb_data, | |
538 | uint8_t *data, size_t dlen, le_advertising_info *info) | |
539 | { | |
540 | uint8_t type; | |
541 | char addr[20]; | |
542 | const char *name; | |
543 | ||
544 | (void)desc; | |
545 | ||
546 | type = data[0]; | |
547 | if (type == EIR_NAME_COMPLETE) { | |
548 | ba2str(&info->bdaddr, addr); | |
549 | name = g_strndup((const char *)&data[1], dlen - 1); | |
550 | if (scan_cb) | |
551 | scan_cb(cb_data, addr, name); | |
552 | free((void *)name); | |
553 | return 0; | |
554 | } | |
555 | ||
556 | /* Unknown or unsupported type, ignore silently. */ | |
557 | return 0; | |
558 | } | |
559 | ||
560 | SR_PRIV int sr_bt_scan_le(struct sr_bt_desc *desc, int duration) | |
561 | { | |
562 | int rc; | |
563 | time_t deadline; | |
564 | uint8_t buf[HCI_MAX_EVENT_SIZE]; | |
565 | ssize_t rdlen, rdpos; | |
566 | evt_le_meta_event *meta; | |
567 | le_advertising_info *info; | |
568 | uint8_t *dataptr; | |
569 | size_t datalen; | |
570 | ||
571 | if (!desc) | |
572 | return -1; | |
573 | sr_dbg("BLE scan (LE)"); | |
574 | ||
575 | sr_spew("desc open"); | |
576 | rc = sr_bt_desc_open(desc, NULL); | |
577 | if (rc < 0) | |
578 | return -1; | |
579 | ||
580 | sr_spew("scan prep"); | |
581 | rc = sr_bt_scan_prep(desc); | |
582 | if (rc < 0) | |
583 | return -1; | |
584 | ||
585 | sr_spew("scan loop"); | |
586 | deadline = time(NULL); | |
587 | deadline += duration; | |
588 | while (time(NULL) <= deadline) { | |
589 | ||
590 | if (sr_bt_check_socket_usable(desc) < 0) | |
591 | break; | |
592 | rdlen = sr_bt_read(desc, buf, sizeof(buf)); | |
593 | if (rdlen < 0) | |
594 | break; | |
595 | if (!rdlen) { | |
596 | sr_spew("usleep() start"); | |
597 | g_usleep(50000); | |
598 | sr_spew("usleep() done"); | |
599 | continue; | |
600 | } | |
601 | if (rdlen < 1 + HCI_EVENT_HDR_SIZE) | |
602 | continue; | |
603 | meta = (void *)&buf[1 + HCI_EVENT_HDR_SIZE]; | |
604 | rdlen -= 1 + HCI_EVENT_HDR_SIZE; | |
605 | if (meta->subevent != EVT_LE_ADVERTISING_REPORT) | |
606 | continue; | |
607 | info = (void *)&meta->data[1]; | |
608 | sr_spew("evt: type %d, len %d", info->evt_type, info->length); | |
609 | if (!info->length) | |
610 | continue; | |
611 | ||
612 | rdpos = 0; | |
613 | while (rdpos < rdlen) { | |
614 | datalen = info->data[rdpos]; | |
615 | dataptr = &info->data[1 + rdpos]; | |
616 | if (rdpos + 1 + datalen > info->length) | |
617 | break; | |
618 | rdpos += 1 + datalen; | |
619 | rc = sr_bt_scan_proc(desc, | |
620 | desc->scan_cb, desc->scan_cb_data, | |
621 | dataptr, datalen, info); | |
622 | if (rc < 0) | |
623 | break; | |
624 | } | |
625 | } | |
626 | ||
627 | sr_spew("scan post"); | |
628 | rc = sr_bt_scan_post(desc); | |
629 | if (rc < 0) | |
630 | return -1; | |
631 | ||
632 | sr_bt_desc_close(desc); | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | SR_PRIV int sr_bt_scan_bt(struct sr_bt_desc *desc, int duration) | |
638 | { | |
639 | int dev_id, sock, rsp_max; | |
640 | long flags; | |
641 | inquiry_info *info; | |
642 | int inq_rc; | |
643 | size_t rsp_count, idx; | |
644 | char addr[20]; | |
645 | char name[256]; | |
646 | ||
647 | if (!desc) | |
648 | return -1; | |
649 | sr_dbg("BLE scan (BT)"); | |
650 | ||
651 | sock = sr_bt_desc_open(desc, &dev_id); | |
652 | if (sock < 0) | |
653 | return -1; | |
654 | ||
655 | rsp_max = 255; | |
656 | info = g_malloc0(rsp_max * sizeof(*info)); | |
657 | flags = 0 /* | IREQ_CACHE_FLUSH */; | |
658 | inq_rc = hci_inquiry(dev_id, duration, rsp_max, NULL, &info, flags); | |
659 | if (inq_rc < 0) | |
660 | perror("hci_inquiry"); | |
661 | rsp_count = inq_rc; | |
662 | ||
663 | for (idx = 0; idx < rsp_count; idx++) { | |
664 | memset(addr, 0, sizeof(addr)); | |
665 | ba2str(&info[idx].bdaddr, addr); | |
666 | memset(name, 0, sizeof(name)); | |
667 | if (hci_read_remote_name(sock, &info[idx].bdaddr, sizeof(name), name, 0) < 0) | |
668 | snprintf(name, sizeof(name), "[unknown]"); | |
669 | if (desc->scan_cb) | |
670 | desc->scan_cb(desc->scan_cb_data, addr, name); | |
671 | } | |
672 | g_free(info); | |
673 | ||
674 | sr_bt_desc_close(desc); | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | /* }}} scan */ | |
680 | /* {{{ connect/disconnect */ | |
681 | ||
682 | SR_PRIV int sr_bt_connect_ble(struct sr_bt_desc *desc) | |
683 | { | |
684 | struct sockaddr_l2 sl2; | |
685 | bdaddr_t mac; | |
686 | int s, ret; | |
687 | ||
688 | if (!desc) | |
689 | return -1; | |
690 | if (!desc->remote_addr[0]) | |
691 | return -1; | |
692 | sr_dbg("BLE connect, remote addr %s", desc->remote_addr); | |
693 | ||
694 | sr_spew("socket()"); | |
695 | s = socket(AF_BLUETOOTH, SOCK_SEQPACKET, 0); | |
696 | if (s < 0) { | |
697 | perror("socket create"); | |
698 | return s; | |
699 | } | |
700 | desc->fd = s; | |
701 | ||
702 | sr_spew("bind()"); | |
703 | memset(&sl2, 0, sizeof(sl2)); | |
704 | sl2.l2_family = AF_BLUETOOTH; | |
705 | sl2.l2_psm = 0; | |
706 | if (desc->local_addr[0]) | |
707 | str2ba(desc->local_addr, &mac); | |
708 | else | |
709 | mac = *BDADDR_ANY; | |
710 | memcpy(&sl2.l2_bdaddr, &mac, sizeof(sl2.l2_bdaddr)); | |
711 | sl2.l2_cid = L2CAP_FC_CONNLESS; | |
712 | sl2.l2_bdaddr_type = BDADDR_LE_PUBLIC; | |
713 | ret = bind(s, (void *)&sl2, sizeof(sl2)); | |
714 | if (ret < 0) { | |
715 | perror("bind"); | |
716 | return ret; | |
717 | } | |
718 | ||
719 | if (0) { | |
720 | struct bt_security buf = { | |
721 | .level = BT_SECURITY_LOW, | |
722 | .key_size = 0, | |
723 | }; | |
724 | sr_spew("security"); | |
725 | ret = setsockopt(s, SOL_BLUETOOTH, BT_SECURITY, &buf, sizeof(buf)); | |
726 | if (ret < 0) { | |
727 | perror("setsockopt"); | |
728 | return ret; | |
729 | } | |
730 | } | |
731 | ||
732 | sr_spew("connect()"); | |
733 | str2ba(desc->remote_addr, &mac); | |
734 | memcpy(&sl2.l2_bdaddr, &mac, sizeof(sl2.l2_bdaddr)); | |
735 | sl2.l2_bdaddr_type = BDADDR_LE_PUBLIC; | |
736 | ret = connect(s, (void *)&sl2, sizeof(sl2)); | |
737 | /* | |
738 | * Cope with "in progress" condition. Keep polling the status | |
739 | * until connect() completes, then get the error by means of | |
740 | * getsockopt(). See the connect(2) manpage for details. | |
741 | */ | |
742 | if (ret < 0 && errno == EINPROGRESS) { | |
743 | struct pollfd fds[1]; | |
744 | uint32_t soerror; | |
745 | socklen_t solen; | |
746 | ||
747 | /* TODO | |
748 | * We seem to get here ("connect in progress") even when | |
749 | * the specified peer is not around at all. Which results | |
750 | * in extended periods of time where nothing happens, and | |
751 | * an application timeout seems to be required. | |
752 | */ | |
753 | sr_spew("in progress ..."); | |
754 | ||
755 | do { | |
756 | sr_spew("poll(OUT)"); | |
757 | memset(fds, 0, sizeof(fds)); | |
758 | fds[0].fd = s; | |
759 | fds[0].events = POLLOUT; | |
760 | ret = poll(fds, ARRAY_SIZE(fds), -1); | |
761 | if (ret < 0) { | |
762 | perror("poll(OUT)"); | |
763 | return ret; | |
764 | } | |
765 | if (!ret) | |
766 | continue; | |
767 | if (!(fds[0].revents & POLLOUT)) | |
768 | continue; | |
769 | } while (1); | |
770 | sr_spew("poll(INVAL)"); | |
771 | memset(fds, 0, sizeof(fds)); | |
772 | fds[0].fd = s; | |
773 | fds[0].events = POLLNVAL; | |
774 | ret = poll(fds, 1, 0); | |
775 | if (ret < 0) { | |
776 | perror("poll(INVAL)"); | |
777 | return ret; | |
778 | } | |
779 | if (ret) { | |
780 | /* socket fd is invalid(?) */ | |
781 | desc->fd = -1; | |
782 | close(s); | |
783 | return -1; | |
784 | } | |
785 | sr_spew("getsocktop(SO_ERROR)"); | |
786 | solen = sizeof(soerror); | |
787 | ret = getsockopt(s, SOL_SOCKET, SO_ERROR, &soerror, &solen); | |
788 | if (ret < 0) { | |
789 | perror("getsockopt(SO_ERROR)"); | |
790 | return ret; | |
791 | } | |
792 | if (soerror) { | |
793 | /* connect(2) failed, SO_ERROR has the error code. */ | |
794 | errno = soerror; | |
795 | perror("connect(PROGRESS)"); | |
796 | return soerror; | |
797 | } | |
798 | ||
799 | /* | |
800 | * TODO Get the receive MTU here? | |
801 | * getsockopt(SOL_BLUETOOTH, BT_RCVMTU, u16); | |
802 | */ | |
803 | } | |
804 | sr_spew("connect() => rc %d, fd %d", ret, desc->fd); | |
805 | if (ret < 0) { | |
806 | perror("connect"); | |
807 | return ret; | |
808 | } | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | SR_PRIV int sr_bt_connect_rfcomm(struct sr_bt_desc *desc) | |
814 | { | |
815 | struct sockaddr_rc addr; | |
816 | int fd, rc; | |
817 | ||
818 | if (!desc) | |
819 | return -1; | |
820 | if (!desc->remote_addr[0]) | |
821 | return -1; | |
822 | sr_dbg("RFCOMM connect, remote addr %s, channel %zu", | |
823 | desc->remote_addr, desc->rfcomm_channel); | |
824 | ||
825 | if (!desc->rfcomm_channel) | |
826 | desc->rfcomm_channel = 1; | |
827 | ||
828 | sr_spew("socket()"); | |
829 | fd = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); | |
830 | if (fd < 0) { | |
831 | perror("socket"); | |
832 | return -1; | |
833 | } | |
834 | desc->fd = fd; | |
835 | ||
836 | sr_spew("connect()"); | |
837 | memset(&addr, 0, sizeof(addr)); | |
838 | addr.rc_family = AF_BLUETOOTH; | |
839 | str2ba(desc->remote_addr, &addr.rc_bdaddr); | |
840 | addr.rc_channel = desc->rfcomm_channel; | |
841 | rc = connect(fd, (struct sockaddr *)&addr, sizeof(addr)); | |
842 | if (rc < 0) { | |
843 | perror("connect"); | |
844 | return -2; | |
845 | } | |
846 | sr_spew("connected"); | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | SR_PRIV void sr_bt_disconnect(struct sr_bt_desc *desc) | |
852 | { | |
853 | sr_dbg("BLE disconnect"); | |
854 | ||
855 | if (!desc) | |
856 | return; | |
857 | sr_bt_desc_close(desc); | |
858 | } | |
859 | ||
860 | static int sr_bt_check_socket_usable(struct sr_bt_desc *desc) | |
861 | { | |
862 | struct pollfd fds[1]; | |
863 | int ret; | |
864 | ||
865 | sr_spew("socket usability check"); | |
866 | if (!desc) | |
867 | return -1; | |
868 | if (desc->fd < 0) | |
869 | return -1; | |
870 | ||
871 | memset(fds, 0, sizeof(fds)); | |
872 | fds[0].fd = desc->fd; | |
873 | fds[0].events = POLLERR | POLLHUP; | |
874 | ret = poll(fds, ARRAY_SIZE(fds), 0); | |
875 | if (ret < 0) | |
876 | return ret; | |
877 | if (!ret) | |
878 | return 0; | |
879 | if (fds[0].revents & POLLHUP) | |
880 | return -1; | |
881 | if (fds[0].revents & POLLERR) | |
882 | return -2; | |
883 | if (fds[0].revents & POLLNVAL) | |
884 | return -3; | |
885 | ||
886 | return 0; | |
887 | } | |
888 | ||
889 | /* }}} connect/disconnect */ | |
890 | /* {{{ indication/notification */ | |
891 | ||
892 | SR_PRIV int sr_bt_start_notify(struct sr_bt_desc *desc) | |
893 | { | |
894 | uint8_t buf[sizeof(desc->cccd_value)]; | |
895 | ssize_t wrlen; | |
896 | ||
897 | if (!desc) | |
898 | return -1; | |
899 | sr_dbg("BLE start notify"); | |
900 | ||
901 | if (sr_bt_check_socket_usable(desc) < 0) | |
902 | return -2; | |
903 | ||
904 | sr_spew("write()"); | |
905 | bt_put_le16(desc->cccd_value, buf); | |
906 | wrlen = sr_bt_char_write_req(desc, desc->cccd_handle, buf, sizeof(buf)); | |
907 | if (wrlen != sizeof(buf)) | |
908 | return -2; | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
913 | SR_PRIV int sr_bt_check_notify(struct sr_bt_desc *desc) | |
914 | { | |
915 | uint8_t buf[1024]; | |
916 | ssize_t rdlen; | |
917 | uint8_t packet_type; | |
918 | uint16_t packet_handle; | |
919 | uint8_t *packet_data; | |
920 | size_t packet_dlen; | |
921 | ||
922 | sr_dbg("BLE check notify"); | |
923 | if (!desc) | |
924 | return -1; | |
925 | ||
926 | if (sr_bt_check_socket_usable(desc) < 0) | |
927 | return -2; | |
928 | ||
929 | /* Get another message from the Bluetooth socket. */ | |
930 | sr_spew("read() non-blocking"); | |
931 | rdlen = sr_bt_read(desc, buf, sizeof(buf)); | |
932 | sr_spew("read() => %zd", rdlen); | |
933 | if (rdlen < 0) | |
934 | return -2; | |
935 | if (!rdlen) | |
936 | return 0; | |
937 | sr_spew("read() len %zd, type 0x%02x", rdlen, buf[0]); | |
938 | ||
939 | /* Get header fields and references to the payload data. */ | |
940 | packet_type = 0x00; | |
941 | packet_handle = 0x0000; | |
942 | packet_data = NULL; | |
943 | packet_dlen = 0; | |
944 | if (rdlen >= 1) | |
945 | packet_type = buf[0]; | |
946 | if (rdlen >= 3) { | |
947 | packet_handle = bt_get_le16(&buf[1]); | |
948 | packet_data = &buf[3]; | |
949 | packet_dlen = rdlen - 3; | |
950 | } | |
951 | ||
952 | /* Dispatch according to the message type. */ | |
953 | switch (packet_type) { | |
954 | case BLE_ATT_ERROR_RESP: | |
955 | sr_spew("error response"); | |
956 | /* EMPTY */ | |
957 | break; | |
958 | case BLE_ATT_WRITE_RESP: | |
959 | sr_spew("write response"); | |
960 | /* EMPTY */ | |
961 | break; | |
962 | case BLE_ATT_HANDLE_INDICATION: | |
963 | sr_spew("handle indication"); | |
964 | sr_bt_write_type(desc, BLE_ATT_HANDLE_CONFIRMATION); | |
965 | if (packet_handle != desc->read_handle) | |
966 | return -4; | |
967 | if (!packet_data) | |
968 | return -4; | |
969 | if (!desc->data_cb) | |
970 | return 0; | |
971 | return desc->data_cb(desc->data_cb_data, packet_data, packet_dlen); | |
972 | case BLE_ATT_HANDLE_NOTIFICATION: | |
973 | sr_spew("handle notification"); | |
974 | if (packet_handle != desc->read_handle) | |
975 | return -4; | |
976 | if (!packet_data) | |
977 | return -4; | |
978 | if (!desc->data_cb) | |
979 | return 0; | |
980 | return desc->data_cb(desc->data_cb_data, packet_data, packet_dlen); | |
981 | default: | |
982 | sr_spew("unsupported type 0x%02x", packet_type); | |
983 | return -3; | |
984 | } | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | /* }}} indication/notification */ | |
990 | /* {{{ read/write */ | |
991 | ||
992 | SR_PRIV ssize_t sr_bt_write(struct sr_bt_desc *desc, | |
993 | const void *data, size_t len) | |
994 | { | |
995 | sr_dbg("BLE write (raw)"); | |
996 | if (!desc) | |
997 | return -1; | |
998 | if (desc->fd < 0) | |
999 | return -1; | |
1000 | ||
1001 | if (sr_bt_check_socket_usable(desc) < 0) | |
1002 | return -2; | |
1003 | ||
1004 | /* Send TX data to the writable characteristics for BLE UART services. */ | |
1005 | if (desc->write_handle) | |
1006 | return sr_bt_char_write_req(desc, desc->write_handle, data, len); | |
1007 | ||
1008 | /* Send raw TX data to the RFCOMM socket for BT Classic channels. */ | |
1009 | return write(desc->fd, data, len); | |
1010 | } | |
1011 | ||
1012 | static ssize_t sr_bt_write_type(struct sr_bt_desc *desc, uint8_t type) | |
1013 | { | |
1014 | ssize_t wrlen; | |
1015 | ||
1016 | sr_dbg("BLE write (type)"); | |
1017 | if (!desc) | |
1018 | return -1; | |
1019 | if (desc->fd < 0) | |
1020 | return -1; | |
1021 | ||
1022 | if (sr_bt_check_socket_usable(desc) < 0) | |
1023 | return -2; | |
1024 | ||
1025 | wrlen = write(desc->fd, &type, sizeof(type)); | |
1026 | if (wrlen < 0) | |
1027 | return wrlen; | |
1028 | if (wrlen < (ssize_t)sizeof(type)) | |
1029 | return -1; | |
1030 | ||
1031 | return 0; | |
1032 | } | |
1033 | ||
1034 | #if WITH_WRITE_TYPE_HANDLE | |
1035 | static ssize_t sr_bt_write_type_handle(struct sr_bt_desc *desc, | |
1036 | uint8_t type, uint16_t handle) | |
1037 | { | |
1038 | sr_dbg("BLE write (type, handle)"); | |
1039 | return sr_bt_write_type_handle_bytes(desc, type, handle, NULL, 0); | |
1040 | } | |
1041 | #endif | |
1042 | ||
1043 | static ssize_t sr_bt_write_type_handle_bytes(struct sr_bt_desc *desc, | |
1044 | uint8_t type, uint16_t handle, const uint8_t *data, size_t len) | |
1045 | { | |
1046 | uint8_t header[sizeof(uint8_t) + sizeof(uint16_t)]; | |
1047 | struct iovec iov[2] = { | |
1048 | { .iov_base = header, .iov_len = sizeof(header), }, | |
1049 | { .iov_base = (void *)data, .iov_len = len, }, | |
1050 | }; | |
1051 | ssize_t wrlen; | |
1052 | ||
1053 | sr_dbg("BLE write (type, handle, data)"); | |
1054 | if (!desc) | |
1055 | return -1; | |
1056 | if (desc->fd < 0) | |
1057 | return -1; | |
1058 | ||
1059 | if (sr_bt_check_socket_usable(desc) < 0) | |
1060 | return -2; | |
1061 | ||
1062 | header[0] = type; | |
1063 | bt_put_le16(handle, &header[1]); | |
1064 | ||
1065 | if (data && len) | |
1066 | wrlen = writev(desc->fd, iov, ARRAY_SIZE(iov)); | |
1067 | else | |
1068 | wrlen = write(desc->fd, header, sizeof(header)); | |
1069 | ||
1070 | if (wrlen < 0) | |
1071 | return wrlen; | |
1072 | if (wrlen < (ssize_t)sizeof(header)) | |
1073 | return -1; | |
1074 | wrlen -= sizeof(header); | |
1075 | ||
1076 | return wrlen; | |
1077 | } | |
1078 | ||
1079 | /* Returns negative upon error, or returns the number of _payload_ bytes written. */ | |
1080 | static ssize_t sr_bt_char_write_req(struct sr_bt_desc *desc, | |
1081 | uint16_t handle, const void *data, size_t len) | |
1082 | { | |
1083 | sr_dbg("BLE write-char req"); | |
1084 | ||
1085 | return sr_bt_write_type_handle_bytes(desc, BLE_ATT_WRITE_REQ, | |
1086 | handle, data, len); | |
1087 | } | |
1088 | ||
1089 | SR_PRIV ssize_t sr_bt_read(struct sr_bt_desc *desc, void *data, size_t len) | |
1090 | { | |
1091 | struct pollfd fds[1]; | |
1092 | int ret; | |
1093 | ssize_t rdlen; | |
1094 | ||
1095 | sr_dbg("BLE read (non-blocking)"); | |
1096 | if (!desc) | |
1097 | return -1; | |
1098 | if (desc->fd < 0) | |
1099 | return -1; | |
1100 | ||
1101 | if (sr_bt_check_socket_usable(desc) < 0) | |
1102 | return -2; | |
1103 | ||
1104 | sr_spew("poll(POLLIN)"); | |
1105 | memset(fds, 0, sizeof(fds)); | |
1106 | fds[0].fd = desc->fd; | |
1107 | fds[0].events = POLLIN; | |
1108 | ret = poll(fds, ARRAY_SIZE(fds), 0); | |
1109 | sr_spew("poll(%d, POLLIN) => 0x%x", desc->fd, fds[0].revents); | |
1110 | if (ret < 0) | |
1111 | return ret; | |
1112 | if (!ret) | |
1113 | return 0; | |
1114 | if (!(fds[0].revents & POLLIN)) | |
1115 | return 0; | |
1116 | ||
1117 | sr_spew("read()"); | |
1118 | rdlen = read(desc->fd, data, len); | |
1119 | sr_spew("read() => %zd", rdlen); | |
1120 | ||
1121 | return rdlen; | |
1122 | } | |
1123 | ||
1124 | /* }}} indication/notification */ | |
1125 | ||
1126 | #endif |