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btstack/example/a2dp_mitm_demo.c
Matthias Ringwald 67badf5110 a2dp-forwarding: sort and deduplicate global variables
2020-09-17 09:41:56 +02:00

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/*
* Copyright (C) 2016 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "a2dp_mitm_demo.c"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack_config.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "btstack_memory.h"
#include "btstack_run_loop.h"
#include "gap.h"
#include "hci.h"
#include "hci_cmd.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "classic/a2dp_sink.h"
#include "classic/a2dp_source.h"
#include "classic/avdtp_sink.h"
#include "classic/avdtp_source.h"
#include "classic/avdtp_util.h"
#include "classic/btstack_sbc.h"
#ifdef HAVE_BTSTACK_STDIN
#include "btstack_stdin.h"
#endif
#define NUM_SBC_FRAMES_PER_PACKET 6
#define MAX_SBC_FRAME_SIZE 120
#define MAX_NUM_SBC_FRAMES 100
#define PREBUFFER_BYTES 10000
#define FILL_AUDIO_BUFFER_TIMEOUT_MS 5
#define A2DP_SAMPLE_RATE 44100
#define SBC_STORAGE_SIZE 1030
// configuration
// iPhone SE
static const char * smartphone_addr_string = "BC:EC:5D:E6:15:03";
// Jawbone static const char * headset_addr_string = "00:21:3C:AC:F7:38";
// Sony MDR330
static const char * headset_addr_string = "00:18:09:28:50:18";
static uint8_t media_sbc_codec_capabilities[] = {
(AVDTP_SBC_44100 << 4) | AVDTP_SBC_STEREO,
0xFF,//(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS,
2, 53
};
// gap
static btstack_packet_callback_registration_t hci_event_callback_registration;
static bd_addr_t smartphone_addr;
static bd_addr_t headset_addr;
// sdp records
static uint8_t sdp_avdtp_sink_service_buffer[150];
static uint8_t sdp_avdtp_source_service_buffer[150];
// stored sbc audio frames
static btstack_ring_buffer_t ring_buffer;
static uint8_t ring_buffer_storage[MAX_NUM_SBC_FRAMES * MAX_SBC_FRAME_SIZE];
// prepare sbc packet
static uint8_t sbc_storage[1030];
// application context
typedef struct {
uint16_t a2dp_sink_cid;
uint8_t a2dp_sink_local_seid;
uint16_t a2dp_source_cid;
uint8_t a2dp_source_local_seid;
uint16_t sbc_frame_size;
uint16_t num_sbc_frames_in_ring_buffer;
bool headset_stream_ready;
bool forward_active;
bool sbc_ready_to_send;
uint32_t time_audio_data_sent; // ms
uint32_t acc_num_missed_samples;
uint32_t samples_ready;
btstack_timer_source_t fill_audio_buffer_timer;
int max_media_payload_size;
} mitm_context_t;
static mitm_context_t mitm_context;
#ifdef HAVE_BTSTACK_STDIN
static uint8_t media_sbc_codec_configuration[] = {
(AVDTP_SBC_44100 << 4) | AVDTP_SBC_STEREO,
(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS,
2, 53
};
// code start
static void handle_l2cap_media_data_packet(uint8_t seid, uint8_t *packet, uint16_t size);
static void dump_sbc_configuration(const uint8_t * packet){
printf(" - num_channels: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_num_channels(packet));
printf(" - sampling_frequency: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet));
printf(" - channel_mode: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet));
printf(" - block_length: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet));
printf(" - subbands: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet));
printf(" - allocation_method: %d\n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet));
printf(" - bitpool_value [%d, %d] \n", a2dp_subevent_signaling_media_codec_sbc_configuration_get_min_bitpool_value(packet),
a2dp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet));
}
static int ring_buffer_init(void){
memset(ring_buffer_storage, 0, sizeof(ring_buffer_storage));
btstack_ring_buffer_init(&ring_buffer, ring_buffer_storage, sizeof(ring_buffer_storage));
mitm_context.num_sbc_frames_in_ring_buffer = 0;
return 0;
}
static void a2dp_fill_audio_buffer_timeout_handler(btstack_timer_source_t * timer){
mitm_context_t * context = (mitm_context_t *) btstack_run_loop_get_timer_context(timer);
btstack_run_loop_set_timer(&context->fill_audio_buffer_timer, FILL_AUDIO_BUFFER_TIMEOUT_MS);
btstack_run_loop_add_timer(&context->fill_audio_buffer_timer);
uint32_t now = btstack_run_loop_get_time_ms();
uint32_t update_period_ms = FILL_AUDIO_BUFFER_TIMEOUT_MS;
if (context->time_audio_data_sent > 0){
update_period_ms = now - context->time_audio_data_sent;
}
uint32_t num_samples = (update_period_ms * A2DP_SAMPLE_RATE) / 1000;
context->acc_num_missed_samples += (update_period_ms * A2DP_SAMPLE_RATE) % 1000;
while (context->acc_num_missed_samples >= 1000){
num_samples++;
context->acc_num_missed_samples -= 1000;
}
context->time_audio_data_sent = now;
context->samples_ready += num_samples;
if (context->sbc_ready_to_send) return;
// do we have enough samples to send?
// calculate num sbc frames per outgoing packet
uint16_t payload_max_size = a2dp_max_media_payload_size(context->a2dp_source_cid, context->a2dp_source_local_seid);
// a2dp_max_media_payload_size(media_tracker.source_local_seid);
int sbc_frames_per_packet = payload_max_size / mitm_context.sbc_frame_size;
// calculate num frames "ready" - using hard-coded
int num_samples_per_frame = 128;
int sbc_frames_ready = context->samples_ready / num_samples_per_frame;
// log_info("Samples ready %u - Frames ready %u / frames per packet %u\n", context->samples_ready, sbc_frames_ready, sbc_frames_per_packet);
if (sbc_frames_ready >= sbc_frames_per_packet){
// schedule sending
context->sbc_ready_to_send = true;
a2dp_source_stream_endpoint_request_can_send_now(context->a2dp_source_cid, context->a2dp_source_local_seid);
}
}
static void a2dp_fill_audio_buffer_timer_start(mitm_context_t * context){
// context->max_media_payload_size = a2dp_max_media_payload_size(context->source_local_seid);
context->max_media_payload_size = btstack_min(a2dp_max_media_payload_size(context->a2dp_source_cid, context->a2dp_source_local_seid), SBC_STORAGE_SIZE);
context->sbc_ready_to_send = false;
btstack_run_loop_remove_timer(&context->fill_audio_buffer_timer);
btstack_run_loop_set_timer_handler(&context->fill_audio_buffer_timer, a2dp_fill_audio_buffer_timeout_handler);
btstack_run_loop_set_timer_context(&context->fill_audio_buffer_timer, context);
btstack_run_loop_set_timer(&context->fill_audio_buffer_timer, FILL_AUDIO_BUFFER_TIMEOUT_MS);
btstack_run_loop_add_timer(&context->fill_audio_buffer_timer);
}
static void a2dp_fill_audio_buffer_timer_stop(mitm_context_t * context){
context->time_audio_data_sent = 0;
context->acc_num_missed_samples = 0;
context->samples_ready = 0;
context->sbc_ready_to_send = false;
btstack_run_loop_remove_timer(&context->fill_audio_buffer_timer);
}
static void handle_l2cap_media_data_packet(uint8_t seid, uint8_t *packet, uint16_t size){
UNUSED(seid);
// if no sink, drop data
if (!mitm_context.headset_stream_ready) {
printf("DEMO: Audio from smartphone, but headset not ready -> dropping\n");
return;
}
UNUSED(size);
int pos = 0;
avdtp_media_packet_header_t media_header;
media_header.version = packet[pos] & 0x03;
media_header.padding = get_bit16(packet[pos],2);
media_header.extension = get_bit16(packet[pos],3);
media_header.csrc_count = (packet[pos] >> 4) & 0x0F;
pos++;
media_header.marker = get_bit16(packet[pos],0);
media_header.payload_type = (packet[pos] >> 1) & 0x7F;
pos++;
media_header.sequence_number = big_endian_read_16(packet, pos);
pos+=2;
media_header.timestamp = big_endian_read_32(packet, pos);
pos+=4;
media_header.synchronization_source = big_endian_read_32(packet, pos);
pos+=4;
UNUSED(media_header);
// TODO: read csrc list
// printf_hexdump( packet, pos );
// printf("MEDIA HEADER: %u timestamp, version %u, padding %u, extension %u, csrc_count %u\n",
// media_header.timestamp, media_header.version, media_header.padding, media_header.extension, media_header.csrc_count);
// printf("MEDIA HEADER: marker %02x, payload_type %02x, sequence_number %u, synchronization_source %u\n",
// media_header.marker, media_header.payload_type, media_header.sequence_number, media_header.synchronization_source);
avdtp_sbc_codec_header_t sbc_header;
sbc_header.fragmentation = get_bit16(packet[pos], 7);
sbc_header.starting_packet = get_bit16(packet[pos], 6);
sbc_header.last_packet = get_bit16(packet[pos], 5);
sbc_header.num_frames = packet[pos] & 0x0f;
pos++;
UNUSED(sbc_header);
// printf("SBC HEADER: num_frames %u, fragmented %u, start %u, stop %u\n", sbc_header.num_frames, sbc_header.fragmentation, sbc_header.starting_packet, sbc_header.last_packet);
// printf_hexdump( packet+pos, size-pos );
// num frames
uint16_t num_frames = sbc_header.num_frames;
// sbc frame size
mitm_context.sbc_frame_size = (size - pos) / sbc_header.num_frames;
// log_info("IN: Ringbuffer: %u bytes free", btstack_ring_buffer_bytes_free(&ring_buffer));
// store individual framees: { len_16, frame }
int i;
for (i=0;i<num_frames;i++){
uint16_t frame_size = mitm_context.sbc_frame_size;
if (btstack_ring_buffer_bytes_free(&ring_buffer) < (2 + frame_size)){
log_info("RING: cannot store frame of size %u, only %u free", frame_size,
btstack_ring_buffer_bytes_free(&ring_buffer));
break;
}
// log_info("RING: store frame of size %u", frame_size);
btstack_ring_buffer_write(&ring_buffer, (uint8_t*) &frame_size, 2);
btstack_ring_buffer_write(&ring_buffer, packet+pos, mitm_context.sbc_frame_size);
pos += mitm_context.sbc_frame_size;
mitm_context.num_sbc_frames_in_ring_buffer++;
}
// printf("DEMO: Audio from smartphone, ringbuffer avail %u\n", btstack_ring_buffer_bytes_available(&ring_buffer));
if (!mitm_context.forward_active && btstack_ring_buffer_bytes_available(&ring_buffer) > PREBUFFER_BYTES){
mitm_context.forward_active = true;
a2dp_fill_audio_buffer_timer_start(&mitm_context);
}
}
static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
bd_addr_t event_addr;
if (packet_type != HCI_EVENT_PACKET) return;
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_PIN_CODE_REQUEST:
// inform about pin code request
printf("Pin code request - using '0000'\n");
hci_event_pin_code_request_get_bd_addr(packet, event_addr);
hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
break;
default:
break;
}
}
static void a2dp_sink_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
bd_addr_t event_addr;
uint8_t status;
if (packet_type != HCI_EVENT_PACKET) return;
if (hci_event_packet_get_type(packet) != HCI_EVENT_A2DP_META) return;
switch (packet[2]){
case A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:
a2dp_subevent_signaling_connection_established_get_bd_addr(packet, event_addr);
if (memcmp(smartphone_addr, event_addr, 6) != 0) break;
status = a2dp_subevent_signaling_connection_established_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
printf("A2DP Sink: Connection failed with status 0x%02x\n", status);
break;
}
mitm_context.a2dp_sink_cid = a2dp_subevent_signaling_connection_established_get_a2dp_cid(packet);
printf("A2DP Sink: Connected to device with addr %s, a2dp cid 0x%02x.\n", bd_addr_to_str(event_addr), mitm_context.a2dp_sink_cid);
break;
case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{
printf("A2DP Sink: received SBC codec configuration.\n");
dump_sbc_configuration(packet);
// init ring buffer to store sbc frames
ring_buffer_init();
break;
}
case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION:
printf("A2DP Sink: received non SBC codec. It will be ignored.\n");
break;
case A2DP_SUBEVENT_STREAM_ESTABLISHED:
mitm_context.a2dp_sink_local_seid = a2dp_subevent_stream_established_get_local_seid(packet);
mitm_context.a2dp_sink_cid = a2dp_subevent_stream_established_get_a2dp_cid(packet);
printf("A2DP Sink: stream established a2dp_cid 0x%02x, local seid %d, remote seid %d\n",
mitm_context.a2dp_sink_cid, mitm_context.a2dp_sink_local_seid, a2dp_subevent_stream_established_get_remote_seid(packet));
break;
case A2DP_SUBEVENT_STREAM_RELEASED:
printf("A2DP Sink: stream released\n");
break;
case A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:
mitm_context.a2dp_sink_cid = 0;
printf("A2DP Sink: signaling connection released\n");
break;
default:
// printf("A2DP Sink: event %d not parsed\n", packet[2]);
break;
}
}
static void a2dp_source_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
bd_addr_t event_addr;
uint8_t status;
if (packet_type != HCI_EVENT_PACKET) return;
if (hci_event_packet_get_type(packet) != HCI_EVENT_A2DP_META) return;
switch (packet[2]){
case A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:
a2dp_subevent_signaling_connection_established_get_bd_addr(packet, event_addr);
if (memcmp(headset_addr, event_addr, 6) != 0) break;
status = a2dp_subevent_signaling_connection_established_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
printf("A2DP Sink: Connection failed with status 0x%02x\n", status);
break;
}
mitm_context.a2dp_source_cid = a2dp_subevent_signaling_connection_established_get_a2dp_cid(packet);
printf("A2DP Source: Connected to device with addr %s, a2dp_cid 0x%02x.\n", bd_addr_to_str(event_addr), mitm_context.a2dp_source_cid);
break;
case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{
printf("A2DP Source: Received SBC codec configuration.\n");
dump_sbc_configuration(packet);
break;
}
case A2DP_SUBEVENT_STREAM_ESTABLISHED:
printf("A2DP Source: stream established a2dp_cid 0x%02x, local seid %d, remote seid %d\n",
mitm_context.a2dp_source_cid, mitm_context.a2dp_source_local_seid, a2dp_subevent_stream_established_get_remote_seid(packet));
printf("A2DP Source: start stream to headset\n");
a2dp_source_start_stream(mitm_context.a2dp_source_cid, mitm_context.a2dp_source_local_seid);
break;
case A2DP_SUBEVENT_STREAM_STARTED:
mitm_context.headset_stream_ready = 1;
printf("A2DP Source: headset stream ready\n");
break;
case A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: {
uint16_t num_frames;
uint16_t len = 0;
uint32_t bytes_read = 0;
int pos = 0;
// calculate max num sbc frames for outgoing earlier
uint16_t payload_max_size = a2dp_max_media_payload_size(mitm_context.a2dp_source_cid, mitm_context.a2dp_source_local_seid);
int max_sbc_frames = payload_max_size / mitm_context.sbc_frame_size;
for (num_frames = 0 ; num_frames < max_sbc_frames && mitm_context.num_sbc_frames_in_ring_buffer > 0; num_frames++){
btstack_ring_buffer_read(&ring_buffer, (uint8_t*) &len, 2, &bytes_read);
// log_info("RING: read frame of size %u", len);
btstack_ring_buffer_read(&ring_buffer, &sbc_storage[pos], len, &bytes_read);
pos += len;
mitm_context.num_sbc_frames_in_ring_buffer--;
}
a2dp_source_stream_send_media_payload(mitm_context.a2dp_source_cid, mitm_context.a2dp_source_local_seid, sbc_storage, pos, num_frames, 0);
mitm_context.sbc_ready_to_send = false;
int num_samples_per_frame = 128;
int samples_consumed = num_frames * num_samples_per_frame;
mitm_context.samples_ready -= samples_consumed;
// printf("DEMO: audio packet sent, ring buffer %u\n", btstack_ring_buffer_bytes_available(&ring_buffer));
log_info("OUT: Ringbuffer: %u bytes available", btstack_ring_buffer_bytes_available(&ring_buffer));
if (btstack_ring_buffer_bytes_available(&ring_buffer) == 0){
log_info("Stream dried out. stop");
printf("Stream dried out. restart\n");
mitm_context.forward_active = false;
a2dp_fill_audio_buffer_timer_stop(&mitm_context);
break;
}
break;
}
case A2DP_SUBEVENT_STREAM_SUSPENDED:
printf(" A2DP_SUBEVENT_STREAM_SUSPENDED, local seid %d\n", mitm_context.a2dp_source_local_seid);
break;
case A2DP_SUBEVENT_STREAM_RELEASED:
printf("A2DP Source: stream released\n");
break;
case A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:
mitm_context.a2dp_source_cid = 0;
printf("A2DP Source: signaling connection released\n");
break;
default:
// printf("A2DP Source: event %d not parsed\n", packet[2]);
break;
}
}
#ifdef HAVE_BTSTACK_STDIN
static void show_usage(void){
bd_addr_t iut_address;
gap_local_bd_addr(iut_address);
// get pairing state
bool smartphone_paired = false;
bool headset_paired = false;
bd_addr_t addr;
link_key_t link_key;
link_key_type_t type;
btstack_link_key_iterator_t it;
gap_link_key_iterator_init(&it);
while (gap_link_key_iterator_get_next(&it, addr, link_key, &type)){
printf("link key for %s\n", bd_addr_to_str(addr));
if (memcmp(addr, smartphone_addr, 6) == 0){
smartphone_paired = true;
}
if (memcmp(addr, headset_addr, 6) == 0){
headset_paired = true;
}
}
printf("\n");
printf("--- A2DP MITM Console on %s ---\n", bd_addr_to_str(iut_address));
printf("- Paired with smartphone: %s\n", smartphone_paired ? "yes" : "no");
printf("- Paired with headset: %s\n", headset_paired ? "yes" : "no");
printf("- Smartphone connected: %s\n", mitm_context.a2dp_sink_cid ? "yes" : "no");
printf("- Headset connected: %s\n", mitm_context.a2dp_source_cid ? "yes" : "no");
printf("- Headset ready: %s\n", mitm_context.headset_stream_ready ? "yes" : "no");
printf("\n");
printf("p - create connection to smartphone %s\n", bd_addr_to_str(smartphone_addr));
printf("h - create connection to headset %s\n", bd_addr_to_str(headset_addr));
printf("d - disconnect all\n");
printf("c - delete all link keys\n");
printf("\nTo setup MITM, please connect to Headphone using 'h',\n");
printf("then connect from smartphone/laptop to BTstack.\n");
printf("Ctrl-c - exit\n");
printf("---\n");
}
#endif
static void stdin_process(char cmd){
uint8_t status = ERROR_CODE_SUCCESS;
switch (cmd){
case 'p':
status = a2dp_sink_establish_stream(smartphone_addr, mitm_context.a2dp_sink_local_seid, &mitm_context.a2dp_sink_cid);
printf("Creating A2DP Connection to remote audio source (smartphone) %s, a2dp sink cid 0x%02x\n",
bd_addr_to_str(smartphone_addr), mitm_context.a2dp_sink_cid);
break;
case 'h':
status = a2dp_source_establish_stream(headset_addr, mitm_context.a2dp_source_local_seid, &mitm_context.a2dp_source_cid);
printf("Creating A2DP Connection to remote audio sink (headset) %s, a2dp source cid 0x%02x\n",
bd_addr_to_str(headset_addr), mitm_context.a2dp_source_cid);
break;
case 'd':
printf("Disconnect all\n");
a2dp_sink_disconnect(mitm_context.a2dp_sink_cid);
a2dp_source_disconnect(mitm_context.a2dp_source_cid);
break;
case 'c':
printf("Deleting all link keys\n");
gap_delete_all_link_keys();
break;
default:
show_usage();
break;
}
if (status != ERROR_CODE_SUCCESS){
printf("A2DP: Could not perform command \'%c\', status 0x%2x\n", cmd, status);
}
}
#endif
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
UNUSED(argc);
(void)argv;
/* Register for HCI events */
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// assume Display and Yes/No buttons
gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
l2cap_init();
sdp_init();
// Initialize A2DP Sink.
a2dp_sink_init();
// Register A2DP Sink for HCI events.
a2dp_sink_register_packet_handler(&a2dp_sink_packet_handler);
// Register A2DP Sink for receiving media data.
a2dp_sink_register_media_handler(&handle_l2cap_media_data_packet);
// Create a stream endpoint to which the streaming channel will be opened.
avdtp_stream_endpoint_t * local_sink_stream_endpoint = a2dp_sink_create_stream_endpoint(AVDTP_AUDIO, AVDTP_CODEC_SBC, media_sbc_codec_capabilities, sizeof(media_sbc_codec_capabilities),
media_sbc_codec_configuration, sizeof(media_sbc_codec_configuration));
if (!local_sink_stream_endpoint){
printf("A2DP Sink: not enough memory to create local stream endpoint\n");
return 1;
}
mitm_context.a2dp_sink_local_seid = avdtp_local_seid(local_sink_stream_endpoint);
printf("A2DP Sink: created stream endpoint with seid %d\n", mitm_context.a2dp_sink_local_seid);
memset(sdp_avdtp_sink_service_buffer, 0, sizeof(sdp_avdtp_sink_service_buffer));
a2dp_sink_create_sdp_record(sdp_avdtp_sink_service_buffer, 0x10001, 1, NULL, NULL);
sdp_register_service(sdp_avdtp_sink_service_buffer);
// Initialize A2DP Source.
a2dp_source_init();
// Register A2DP Source for HCI events.
a2dp_source_register_packet_handler(&a2dp_source_packet_handler);
// Create stream endpoint.
avdtp_stream_endpoint_t * local_source_stream_endpoint = a2dp_source_create_stream_endpoint(AVDTP_AUDIO, AVDTP_CODEC_SBC, media_sbc_codec_capabilities, sizeof(media_sbc_codec_capabilities), media_sbc_codec_configuration, sizeof(media_sbc_codec_configuration));
if (!local_source_stream_endpoint){
printf("A2DP Source: not enough memory to create local stream endpoint\n");
return 1;
}
mitm_context.a2dp_source_local_seid = avdtp_local_seid(local_source_stream_endpoint);
printf("A2DP Source: created stream endpoint with seid %d\n", mitm_context.a2dp_source_local_seid);
memset(sdp_avdtp_source_service_buffer, 0, sizeof(sdp_avdtp_source_service_buffer));
a2dp_source_create_sdp_record(sdp_avdtp_source_service_buffer, 0x10002, 1, NULL, NULL);
sdp_register_service(sdp_avdtp_source_service_buffer);
// GAP
gap_set_local_name("A2DP MITM Demo 00:00:00:00:00:00");
gap_discoverable_control(1);
gap_set_class_of_device(0x200408);
// parse human readable Bluetooth address
sscanf_bd_addr(smartphone_addr_string, smartphone_addr);
sscanf_bd_addr(headset_addr_string, headset_addr);
// turn on!
hci_power_control(HCI_POWER_ON);
#ifdef HAVE_BTSTACK_STDIN
btstack_stdin_setup(stdin_process);
#endif
return 0;
}
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