xref: /btstack/example/panu_demo.c (revision b3fcedb9c9ccbcc9680da165cd86f394be5d84a8)
1 /*
2  * Copyright (C) 2014 BlueKitchen GmbH
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the copyright holders nor the names of
14  *    contributors may be used to endorse or promote products derived
15  *    from this software without specific prior written permission.
16  * 4. Any redistribution, use, or modification is done solely for
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19  *
20  * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
24  * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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36  */
37 
38 /*
39  * panu_demo.c
40  * Author: Ole Reinhardt <[email protected]>
41  */
42 
43 /* EXAMPLE_START(panu_demo): PANU Demo
44  *
45  * @text This example implements both a PANU client and a server. In server mode, it
46  * sets up a BNEP server and registers a PANU SDP record and waits for incoming connections.
47  * In client mode, it connects to a remote device, does an SDP Query to identify the PANU
48  * service and initiates a BNEP connection.
49  */
50 
51 #include "btstack_config.h"
52 
53 #include <arpa/inet.h>
54 #include <errno.h>
55 #include <fcntl.h>
56 #include <ifaddrs.h>
57 #include <stdint.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62 
63 #include <net/if_arp.h>
64 
65 #ifdef __APPLE__
66 #include <net/if.h>
67 #include <net/if_types.h>
68 
69 #include <netinet/if_ether.h>
70 #include <netinet/in.h>
71 #endif
72 
73 #include <sys/ioctl.h>
74 #include <sys/param.h>
75 #include <sys/socket.h>
76 #include <sys/stat.h>
77 #include <sys/types.h>
78 
79 #ifdef __linux
80 #include <linux/if.h>
81 #include <linux/if_tun.h>
82 #endif
83 
84 #include "btstack_memory.h"
85 #include "btstack_event.h"
86 #include "btstack_run_loop.h"
87 #include "classic/sdp_client.h"
88 #include "classic/sdp_util.h"
89 #include "hci.h"
90 #include "hci_cmd.h"
91 #include "hci_dump.h"
92 #include "l2cap.h"
93 #include "pan.h"
94 
95 static int record_id = -1;
96 static uint16_t bnep_l2cap_psm      = 0;
97 static uint32_t bnep_remote_uuid    = 0;
98 static uint16_t bnep_version        = 0;
99 static uint16_t bnep_cid            = 0;
100 
101 static uint8_t   attribute_value[1000];
102 static const unsigned int attribute_value_buffer_size = sizeof(attribute_value);
103 
104 //static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
105 // static bd_addr_t remote = {0xE0,0x06,0xE6,0xBB,0x95,0x79}; // Ole Thinkpad
106 static bd_addr_t remote = {0x84,0x38,0x35,0x65,0xD1,0x15};  // MacBook 2013
107 
108 static int  tap_fd = -1;
109 static uint8_t network_buffer[BNEP_MTU_MIN];
110 static size_t  network_buffer_len = 0;
111 
112 #ifdef __APPLE__
113 // tuntaposx provides fixed set of tapX devices
114 static const char * tap_dev = "/dev/tap0";
115 static char tap_dev_name[16] = "tap0";
116 #endif
117 
118 #ifdef __linux
119 // Linux uses single control device to bring up tunX or tapX interface
120 static const char * tap_dev = "/dev/net/tun";
121 static char tap_dev_name[16] = "bnep%d";
122 #endif
123 
124 
125 static btstack_data_source_t tap_dev_ds;
126 static btstack_packet_callback_registration_t hci_event_callback_registration;
127 
128 /* @section Main application configuration
129  *
130  * @text In the application configuration, L2CAP and BNEP are initialized and a BNEP service, for server mode,
131  * is registered, before the Bluetooth stack gets started, as shown in Listing PanuSetup.
132  */
133 
134 /* LISTING_START(PanuSetup): Panu setup */
135 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
136 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
137 
138 static void panu_setup(void){
139 
140     // register for HCI events
141     hci_event_callback_registration.callback = &packet_handler;
142     hci_add_event_handler(&hci_event_callback_registration);
143 
144     // Initialize L2CAP
145     l2cap_init();
146 
147     // Initialise BNEP
148     bnep_init();
149     // Minimum L2CAP MTU for bnep is 1691 bytes
150     bnep_register_service(packet_handler, SDP_PANU, 1691);
151 }
152 /* LISTING_END */
153 
154 /* @section TUN / TAP interface routines
155  *
156  * @text This example requires a TUN/TAP interface to connect the Bluetooth network interface
157  * with the native system. It has been tested on Linux and OS X, but should work on any
158  * system that provides TUN/TAP with minor modifications.
159  *
160  * On Linux, TUN/TAP is available by default. On OS X, tuntaposx from
161  * http://tuntaposx.sourceforge.net needs to be installed.
162  *
163  * The *tap_alloc* function sets up a virtual network interface with the given Bluetooth Address.
164  * It is rather low-level as it sets up and configures a network interface.
165  */
166 
167 static int tap_alloc(char *dev, bd_addr_t bd_addr)
168 {
169     struct ifreq ifr;
170     int fd_dev;
171     int fd_socket;
172 
173     if( (fd_dev = open(tap_dev, O_RDWR)) < 0 ) {
174         fprintf(stderr, "TAP: Error opening %s: %s\n", tap_dev, strerror(errno));
175         return -1;
176     }
177 
178 #ifdef __linux
179     memset(&ifr, 0, sizeof(ifr));
180 
181     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
182     if( *dev ) {
183         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
184     }
185 
186     int err;
187     if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) {
188         fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno));
189         close(fd_dev);
190         return -1;
191     }
192     strcpy(dev, ifr.ifr_name);
193 #endif
194 #ifdef __APPLE__
195     dev = tap_dev_name;
196 #endif
197 
198     fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
199 	if (fd_socket < 0) {
200         close(fd_dev);
201 		fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno));
202 		return -1;
203 	}
204 
205     // Configure the MAC address of the newly created bnep(x)
206     // device to the local bd_address
207     memset (&ifr, 0, sizeof(struct ifreq));
208     strcpy(ifr.ifr_name, dev);
209 #ifdef __linux
210     ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
211     memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t));
212 	if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) {
213         close(fd_dev);
214         close(fd_socket);
215         fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno));
216         exit(1);
217 		return -1;
218 	}
219 #endif
220 #ifdef __APPLE__
221     ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
222     ifr.ifr_addr.sa_family = AF_LINK;
223     (void)memcpy(ifr.ifr_addr.sa_data, bd_addr, ETHER_ADDR_LEN);
224     if (ioctl(fd_socket, SIOCSIFLLADDR, &ifr) == -1) {
225         close(fd_dev);
226         close(fd_socket);
227         fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno));
228         exit(1);
229         return -1;
230 }
231 #endif
232 
233     // Bring the interface up
234 	if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) {
235         close(fd_dev);
236         close(fd_socket);
237 		fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno));
238 		return -1;
239 	}
240 
241 	if ((ifr.ifr_flags & IFF_UP) == 0) {
242 		ifr.ifr_flags |= IFF_UP;
243 
244 		if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) {
245             close(fd_dev);
246             close(fd_socket);
247             fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno));
248             return -1;
249 		}
250 	}
251 
252 	close(fd_socket);
253 
254     return fd_dev;
255 }
256 
257 /*
258  * @text Listing processTapData shows how a packet is received from the TAP network interface
259  * and forwarded over the BNEP connection.
260  *
261  * After successfully reading a network packet, the call to
262  * the *bnep_can_send_packet_now* function checks, if BTstack can forward
263  * a network packet now. If that's not possible, the received data stays
264  * in the network buffer and the data source elements is removed from the
265  * run loop. The *process_tap_dev_data* function will not be called until
266  * the data source is registered again. This provides a basic flow control.
267  */
268 
269 /* LISTING_START(processTapData): Process incoming network packets */
270 static void process_tap_dev_data(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type)
271 {
272     ssize_t len;
273     len = read(ds->fd, network_buffer, sizeof(network_buffer));
274     if (len <= 0){
275         fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno));
276         return;
277     }
278 
279     network_buffer_len = len;
280     if (bnep_can_send_packet_now(bnep_cid)) {
281         bnep_send(bnep_cid, network_buffer, network_buffer_len);
282         network_buffer_len = 0;
283     } else {
284         // park the current network packet
285         btstack_run_loop_remove_data_source(&tap_dev_ds);
286     }
287     return;
288 }
289 /* LISTING_END */
290 
291 // PANU client routines
292 static char * get_string_from_data_element(uint8_t * element){
293     de_size_t de_size = de_get_size_type(element);
294     int pos     = de_get_header_size(element);
295     int len = 0;
296     switch (de_size){
297         case DE_SIZE_VAR_8:
298             len = element[1];
299             break;
300         case DE_SIZE_VAR_16:
301             len = big_endian_read_16(element, 1);
302             break;
303         default:
304             break;
305     }
306     char * str = (char*)malloc(len+1);
307     memcpy(str, &element[pos], len);
308     str[len] ='\0';
309     return str;
310 }
311 
312 
313 /* @section SDP parser callback
314  *
315  * @text The SDP parsers retrieves the BNEP PAN UUID as explained in
316  * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}.
317  */
318 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
319 
320     des_iterator_t des_list_it;
321     des_iterator_t prot_it;
322     char *str;
323 
324     switch (hci_event_packet_get_type(packet)){
325         case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
326             // Handle new SDP record
327             if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id) {
328                 record_id = sdp_event_query_attribute_byte_get_record_id(packet);
329                 printf("SDP Record: Nr: %d\n", record_id);
330             }
331 
332             if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) {
333                 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet);
334 
335                 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) {
336 
337                     switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) {
338                         case SDP_ServiceClassIDList:
339                             if (de_get_element_type(attribute_value) != DE_DES) break;
340                             for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
341                                 uint8_t * element = des_iterator_get_element(&des_list_it);
342                                 if (de_get_element_type(element) != DE_UUID) continue;
343                                 uint32_t uuid = de_get_uuid32(element);
344                                 switch (uuid){
345                                     case SDP_PANU:
346                                     case SDP_NAP:
347                                     case SDP_GN:
348                                         printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid);
349                                         bnep_remote_uuid = uuid;
350                                         break;
351                                     default:
352                                         break;
353                                 }
354                             }
355                             break;
356                         case 0x0100:
357                         case 0x0101:
358                             str = get_string_from_data_element(attribute_value);
359                             printf("SDP Attribute: 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str);
360                             free(str);
361                             break;
362                         case 0x0004: {
363                                 printf("SDP Attribute: 0x%04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet));
364 
365                                 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
366                                     uint8_t       *des_element;
367                                     uint8_t       *element;
368                                     uint32_t       uuid;
369 
370                                     if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
371 
372                                     des_element = des_iterator_get_element(&des_list_it);
373                                     des_iterator_init(&prot_it, des_element);
374                                     element = des_iterator_get_element(&prot_it);
375 
376                                     if (de_get_element_type(element) != DE_UUID) continue;
377 
378                                     uuid = de_get_uuid32(element);
379                                     switch (uuid){
380                                         case SDP_L2CAPProtocol:
381                                             if (!des_iterator_has_more(&prot_it)) continue;
382                                             des_iterator_next(&prot_it);
383                                             de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm);
384                                             break;
385                                         case SDP_BNEPProtocol:
386                                             if (!des_iterator_has_more(&prot_it)) continue;
387                                             des_iterator_next(&prot_it);
388                                             de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version);
389                                             break;
390                                         default:
391                                             break;
392                                     }
393                                 }
394                                 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version);
395 
396                                 /* Create BNEP connection */
397                                 bnep_connect(packet_handler, remote, bnep_l2cap_psm, PANU_UUID, bnep_remote_uuid);
398                             }
399                             break;
400                         default:
401                             break;
402                     }
403                 }
404             } else {
405                 fprintf(stderr, "SDP attribute value buffer size exceeded: available %d, required %d\n", attribute_value_buffer_size, sdp_event_query_attribute_byte_get_attribute_length(packet));
406             }
407             break;
408 
409         case SDP_EVENT_QUERY_COMPLETE:
410             fprintf(stderr, "General query done with status %d.\n", sdp_event_query_complete_get_status(packet));
411 
412             break;
413     }
414 }
415 
416 /*
417  * @section Packet Handler
418  *
419  * @text The packet handler responds to various HCI Events.
420  */
421 
422 
423 /* LISTING_START(packetHandler): Packet Handler */
424 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
425 {
426 /* LISTING_PAUSE */
427     int       rc;
428     uint8_t   event;
429     bd_addr_t event_addr;
430     bd_addr_t local_addr;
431     uint16_t  uuid_source;
432     uint16_t  uuid_dest;
433     uint16_t  mtu;
434 
435     /* LISTING_RESUME */
436     switch (packet_type) {
437 		case HCI_EVENT_PACKET:
438             event = hci_event_packet_get_type(packet);
439             switch (event) {
440                 /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING
441                  * is received and the example is started in client mode, the remote SDP BNEP query is started.
442                  */
443                 case BTSTACK_EVENT_STATE:
444                     if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
445                         printf("Start SDP BNEP query.\n");
446                         sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, SDP_BNEPProtocol);
447                     }
448                     break;
449 
450                 /* LISTING_PAUSE */
451                 case HCI_EVENT_PIN_CODE_REQUEST:
452 					// inform about pin code request
453                     printf("Pin code request - using '0000'\n");
454                     hci_event_pin_code_request_get_bd_addr(packet, event_addr);
455 					hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
456 					break;
457 
458                 case HCI_EVENT_USER_CONFIRMATION_REQUEST:
459                     // inform about user confirmation request
460                     printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8));
461                     printf("SSP User Confirmation Auto accept\n");
462                     break;
463 
464                 /* LISTING_RESUME */
465 
466                 /* @text BNEP_EVENT_CHANNEL_OPENED is received after a BNEP connection was established or
467                  * or when the connection fails. The status field returns the error code.
468                  *
469                  * The TAP network interface is then configured. A data source is set up and registered with the
470                  * run loop to receive Ethernet packets from the TAP interface.
471                  *
472                  * The event contains both the source and destination UUIDs, as well as the MTU for this connection and
473                  * the BNEP Channel ID, which is used for sending Ethernet packets over BNEP.
474                  */
475 				case BNEP_EVENT_CHANNEL_OPENED:
476                     if (bnep_event_channel_opened_get_status(packet)) {
477                         printf("BNEP channel open failed, status %02x\n", bnep_event_channel_opened_get_status(packet));
478                     } else {
479                         bnep_cid    = bnep_event_channel_opened_get_bnep_cid(packet);
480                         uuid_source = bnep_event_channel_opened_get_source_uuid(packet);
481                         uuid_dest   = bnep_event_channel_opened_get_destination_uuid(packet);
482                         mtu         = bnep_event_channel_opened_get_mtu(packet);
483                         //bt_flip_addr(event_addr, &packet[9]);
484                         memcpy(&event_addr, &packet[11], sizeof(bd_addr_t));
485                         printf("BNEP connection open succeeded to %s source UUID 0x%04x dest UUID: 0x%04x, max frame size %u\n", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu);
486                         /* Create the tap interface */
487                         gap_local_bd_addr(local_addr);
488                         tap_fd = tap_alloc(tap_dev_name, local_addr);
489                         if (tap_fd < 0) {
490                             printf("Creating BNEP tap device failed: %s\n", strerror(errno));
491                         } else {
492                             printf("BNEP device \"%s\" allocated.\n", tap_dev_name);
493                             /* Create and register a new runloop data source */
494                             btstack_run_loop_set_data_source_fd(&tap_dev_ds, tap_fd);
495                             btstack_run_loop_set_data_source_handler(&tap_dev_ds, &process_tap_dev_data);
496                             btstack_run_loop_add_data_source(&tap_dev_ds);
497                         }
498                     }
499 					break;
500 
501                 /* @text If there is a timeout during the connection setup, BNEP_EVENT_CHANNEL_TIMEOUT will be received
502                  * and the BNEP connection  will be closed
503                  */
504                 case BNEP_EVENT_CHANNEL_TIMEOUT:
505                     printf("BNEP channel timeout! Channel will be closed\n");
506                     break;
507 
508                 /* @text BNEP_EVENT_CHANNEL_CLOSED is received when the connection gets closed.
509                  */
510                 case BNEP_EVENT_CHANNEL_CLOSED:
511                     printf("BNEP channel closed\n");
512                     btstack_run_loop_remove_data_source(&tap_dev_ds);
513                     if (tap_fd > 0) {
514                         close(tap_fd);
515                         tap_fd = -1;
516                     }
517                     break;
518 
519                 /* @text BNEP_EVENT_CAN_SEND_NOW indicates that a new packet can be send. This triggers the retry of a
520                  * parked network packet. If this succeeds, the data source element is added to the run loop again.
521                  */
522                 case BNEP_EVENT_CAN_SEND_NOW:
523                     // Check for parked network packets and send it out now
524                     if (network_buffer_len > 0) {
525                         bnep_send(bnep_cid, network_buffer, network_buffer_len);
526                         network_buffer_len = 0;
527                         // Re-add the tap device data source
528                         btstack_run_loop_add_data_source(&tap_dev_ds);
529                     }
530 
531                     break;
532 
533                 default:
534                     break;
535             }
536             break;
537 
538         /* @text Ethernet packets from the remote device are received in the packet handler with type BNEP_DATA_PACKET.
539          * It is forwarded to the TAP interface.
540          */
541         case BNEP_DATA_PACKET:
542             // Write out the ethernet frame to the tap device
543             if (tap_fd > 0) {
544                 rc = write(tap_fd, packet, size);
545                 if (rc < 0) {
546                     fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno));
547                 } else
548                 if (rc != size) {
549                     fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size);
550                 }
551             }
552             break;
553 
554         default:
555             break;
556     }
557 }
558 /* LISTING_END */
559 
560 
561 int btstack_main(int argc, const char * argv[]);
562 int btstack_main(int argc, const char * argv[]){
563 
564     printf("Client HCI init done\n");
565 
566     panu_setup();
567     // Turn on the device
568     hci_power_control(HCI_POWER_ON);
569     return 0;
570 }
571 
572 /* EXAMPLE_END */
573 /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-  */
574 
575