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btstack/src/classic/avrcp.c
Matthias Ringwald 3cd982f433 test/fuzz: fix avrcp fuzzer
2021-02-25 16:28:29 +01:00

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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__ "avrcp.c"
#include <stdint.h>
#include <string.h>
#include "bluetooth_psm.h"
#include "bluetooth_sdp.h"
#include "btstack_debug.h"
#include "btstack_event.h"
#include "btstack_memory.h"
#include "classic/sdp_client.h"
#include "classic/sdp_util.h"
#include "classic/avrcp.h"
typedef struct {
uint8_t parse_sdp_record;
uint32_t record_id;
uint16_t avrcp_cid;
uint16_t avrcp_l2cap_psm;
uint16_t avrcp_version;
uint16_t browsing_l2cap_psm;
uint16_t browsing_version;
} avrcp_sdp_query_context_t;
static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static const char * default_avrcp_controller_service_name = "BTstack AVRCP Controller Service";
static const char * default_avrcp_controller_service_provider_name = "BTstack AVRCP Controller Service Provider";
static const char * default_avrcp_target_service_name = "BTstack AVRCP Target Service";
static const char * default_avrcp_target_service_provider_name = "BTstack AVRCP Target Service Provider";
static uint16_t avrcp_cid_counter;
static btstack_context_callback_registration_t avrcp_handle_sdp_client_query_request;
static avrcp_sdp_query_context_t sdp_query_context;
static btstack_packet_handler_t avrcp_callback;
static uint8_t attribute_value[45];
static const unsigned int attribute_value_buffer_size = sizeof(attribute_value);
static btstack_linked_list_t connections;
static btstack_packet_handler_t avrcp_controller_packet_handler;
static btstack_packet_handler_t avrcp_target_packet_handler;
static bool l2cap_service_registered = false;
static const char * avrcp_subunit_type_name[] = {
"MONITOR", "AUDIO", "PRINTER", "DISC", "TAPE_RECORDER_PLAYER", "TUNER",
"CA", "CAMERA", "RESERVED", "PANEL", "BULLETIN_BOARD", "CAMERA_STORAGE",
"VENDOR_UNIQUE", "RESERVED_FOR_ALL_SUBUNIT_TYPES",
"EXTENDED_TO_NEXT_BYTE", "UNIT", "ERROR"
};
const char * avrcp_subunit2str(uint16_t index){
if (index <= 11) return avrcp_subunit_type_name[index];
if ((index >= 0x1C) && (index <= 0x1F)) return avrcp_subunit_type_name[index - 0x10];
return avrcp_subunit_type_name[16];
}
static const char * avrcp_event_name[] = {
"ERROR", "PLAYBACK_STATUS_CHANGED",
"TRACK_CHANGED", "TRACK_REACHED_END", "TRACK_REACHED_START",
"PLAYBACK_POS_CHANGED", "BATT_STATUS_CHANGED", "SYSTEM_STATUS_CHANGED",
"PLAYER_APPLICATION_SETTING_CHANGED", "NOW_PLAYING_CONTENT_CHANGED",
"AVAILABLE_PLAYERS_CHANGED", "ADDRESSED_PLAYER_CHANGED", "UIDS_CHANGED", "VOLUME_CHANGED"
};
const char * avrcp_event2str(uint16_t index){
if (index <= 0x0d) return avrcp_event_name[index];
return avrcp_event_name[0];
}
static const char * avrcp_operation_name[] = {
"NOT SUPPORTED", // 0x3B
"SKIP", "NOT SUPPORTED", "NOT SUPPORTED", "NOT SUPPORTED", "NOT SUPPORTED",
"VOLUME_UP", "VOLUME_DOWN", "MUTE", "PLAY", "STOP", "PAUSE", "NOT SUPPORTED",
"REWIND", "FAST_FORWARD", "NOT SUPPORTED", "FORWARD", "BACKWARD" // 0x4C
};
const char * avrcp_operation2str(uint8_t index){
if ((index >= 0x3B) && (index <= 0x4C)) return avrcp_operation_name[index - 0x3B];
return avrcp_operation_name[0];
}
static const char * avrcp_media_attribute_id_name[] = {
"NONE", "TITLE", "ARTIST", "ALBUM", "TRACK", "TOTAL TRACKS", "GENRE", "SONG LENGTH"
};
const char * avrcp_attribute2str(uint8_t index){
if ((index >= 1) && (index <= 7)) return avrcp_media_attribute_id_name[index];
return avrcp_media_attribute_id_name[0];
}
static const char * avrcp_play_status_name[] = {
"STOPPED", "PLAYING", "PAUSED", "FORWARD SEEK", "REVERSE SEEK",
"ERROR" // 0xFF
};
const char * avrcp_play_status2str(uint8_t index){
if ((index >= 1) && (index <= 4)) return avrcp_play_status_name[index];
return avrcp_play_status_name[5];
}
static const char * avrcp_ctype_name[] = {
"CONTROL",
"STATUS",
"SPECIFIC_INQUIRY",
"NOTIFY",
"GENERAL_INQUIRY",
"RESERVED5",
"RESERVED6",
"RESERVED7",
"NOT IMPLEMENTED IN REMOTE",
"ACCEPTED BY REMOTE",
"REJECTED BY REMOTE",
"IN_TRANSITION",
"IMPLEMENTED_STABLE",
"CHANGED_STABLE",
"RESERVED",
"INTERIM"
};
const char * avrcp_ctype2str(uint8_t index){
if (index < sizeof(avrcp_ctype_name)){
return avrcp_ctype_name[index];
}
return "NONE";
}
static const char * avrcp_shuffle_mode_name[] = {
"SHUFFLE OFF",
"SHUFFLE ALL TRACKS",
"SHUFFLE GROUP"
};
const char * avrcp_shuffle2str(uint8_t index){
if ((index >= 1) && (index <= 3)) return avrcp_shuffle_mode_name[index-1];
return "NONE";
}
static const char * avrcp_repeat_mode_name[] = {
"REPEAT OFF",
"REPEAT SINGLE TRACK",
"REPEAT ALL TRACKS",
"REPEAT GROUP"
};
const char * avrcp_repeat2str(uint8_t index){
if ((index >= 1) && (index <= 4)) return avrcp_repeat_mode_name[index-1];
return "NONE";
}
btstack_linked_list_t avrcp_get_connections(void){
return connections;
}
uint8_t avrcp_cmd_opcode(uint8_t *packet, uint16_t size){
uint8_t cmd_opcode_index = 5;
if (cmd_opcode_index > size) return AVRCP_CMD_OPCODE_UNDEFINED;
return packet[cmd_opcode_index];
}
void avrcp_create_sdp_record(uint8_t controller, uint8_t * service, uint32_t service_record_handle, uint8_t browsing, uint16_t supported_features,
const char * service_name, const char * service_provider_name){
uint8_t* attribute;
de_create_sequence(service);
// 0x0000 "Service Record Handle"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE);
de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle);
// 0x0001 "Service Class ID List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST);
attribute = de_push_sequence(service);
{
if (controller){
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL);
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_CONTROLLER);
} else {
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_TARGET);
}
}
de_pop_sequence(service, attribute);
// 0x0004 "Protocol Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST);
attribute = de_push_sequence(service);
{
uint8_t* l2cpProtocol = de_push_sequence(attribute);
{
de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP);
de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PSM_AVCTP);
}
de_pop_sequence(attribute, l2cpProtocol);
uint8_t* avctpProtocol = de_push_sequence(attribute);
{
de_add_number(avctpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVCTP); // avctpProtocol_service
de_add_number(avctpProtocol, DE_UINT, DE_SIZE_16, 0x0104); // version
}
de_pop_sequence(attribute, avctpProtocol);
}
de_pop_sequence(service, attribute);
// 0x0005 "Public Browse Group"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group
attribute = de_push_sequence(service);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT);
}
de_pop_sequence(service, attribute);
// 0x0009 "Bluetooth Profile Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST);
attribute = de_push_sequence(service);
{
uint8_t *avrcProfile = de_push_sequence(attribute);
{
de_add_number(avrcProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL);
de_add_number(avrcProfile, DE_UINT, DE_SIZE_16, 0x0106);
}
de_pop_sequence(attribute, avrcProfile);
}
de_pop_sequence(service, attribute);
// 0x000d "Additional Bluetooth Profile Descriptor List"
if (browsing){
de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS);
attribute = de_push_sequence(service);
{
uint8_t * des = de_push_sequence(attribute);
{
uint8_t* browsing_l2cpProtocol = de_push_sequence(des);
{
de_add_number(browsing_l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP);
de_add_number(browsing_l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PSM_AVCTP_BROWSING);
}
de_pop_sequence(des, browsing_l2cpProtocol);
uint8_t* browsing_avctpProtocol = de_push_sequence(des);
{
de_add_number(browsing_avctpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVCTP); // browsing_avctpProtocol_service
de_add_number(browsing_avctpProtocol, DE_UINT, DE_SIZE_16, 0x0104); // version
}
de_pop_sequence(des, browsing_avctpProtocol);
}
de_pop_sequence(attribute, des);
}
de_pop_sequence(service, attribute);
}
// 0x0100 "Service Name"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100);
if (service_name){
de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name);
} else {
if (controller){
de_add_data(service, DE_STRING, strlen(default_avrcp_controller_service_name), (uint8_t *) default_avrcp_controller_service_name);
} else {
de_add_data(service, DE_STRING, strlen(default_avrcp_target_service_name), (uint8_t *) default_avrcp_target_service_name);
}
}
// 0x0100 "Provider Name"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102);
if (service_provider_name){
de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name);
} else {
if (controller){
de_add_data(service, DE_STRING, strlen(default_avrcp_controller_service_provider_name), (uint8_t *) default_avrcp_controller_service_provider_name);
} else {
de_add_data(service, DE_STRING, strlen(default_avrcp_target_service_provider_name), (uint8_t *) default_avrcp_target_service_provider_name);
}
}
// 0x0311 "Supported Features"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311);
de_add_number(service, DE_UINT, DE_SIZE_16, supported_features);
}
avrcp_connection_t * avrcp_get_connection_for_bd_addr_for_role(avrcp_role_t role, bd_addr_t addr){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (memcmp(addr, connection->remote_addr, 6) != 0) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * avrcp_get_connection_for_l2cap_signaling_cid_for_role(avrcp_role_t role, uint16_t l2cap_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (connection->l2cap_signaling_cid != l2cap_cid) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * avrcp_get_connection_for_avrcp_cid_for_role(avrcp_role_t role, uint16_t avrcp_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (connection->avrcp_cid != avrcp_cid) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * avrcp_get_connection_for_browsing_cid_for_role(avrcp_role_t role, uint16_t browsing_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (connection->avrcp_browsing_cid != browsing_cid) continue;
return connection;
}
return NULL;
}
avrcp_connection_t * avrcp_get_connection_for_browsing_l2cap_cid_for_role(avrcp_role_t role, uint16_t browsing_l2cap_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (connection->browsing_connection && (connection->browsing_connection->l2cap_browsing_cid != browsing_l2cap_cid)) continue;
return connection;
}
return NULL;
}
avrcp_browsing_connection_t * avrcp_get_browsing_connection_for_l2cap_cid_for_role(avrcp_role_t role, uint16_t l2cap_cid){
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->role != role) continue;
if (connection->browsing_connection && (connection->browsing_connection->l2cap_browsing_cid != l2cap_cid)) continue;
return connection->browsing_connection;
}
return NULL;
}
void avrcp_request_can_send_now(avrcp_connection_t * connection, uint16_t l2cap_cid){
connection->wait_to_send = true;
l2cap_request_can_send_now_event(l2cap_cid);
}
uint16_t avrcp_get_next_cid(avrcp_role_t role){
do {
if (avrcp_cid_counter == 0xffff) {
avrcp_cid_counter = 1;
} else {
avrcp_cid_counter++;
}
} while (avrcp_get_connection_for_avrcp_cid_for_role(role, avrcp_cid_counter) != NULL) ;
return avrcp_cid_counter;
}
static avrcp_connection_t * avrcp_create_connection(avrcp_role_t role, bd_addr_t remote_addr){
avrcp_connection_t * connection = btstack_memory_avrcp_connection_get();
if (!connection){
log_error("Not enough memory to create connection for role %d", role);
return NULL;
}
connection->state = AVCTP_CONNECTION_IDLE;
connection->role = role;
connection->transaction_id = 0xFF;
connection->transaction_id_counter = 0;
connection->max_num_fragments = 0xFF;
log_info("avrcp_create_connection, role %d", role);
(void)memcpy(connection->remote_addr, remote_addr, 6);
btstack_linked_list_add(&connections, (btstack_linked_item_t *) connection);
return connection;
}
static void avrcp_finalize_connection(avrcp_connection_t * connection){
btstack_run_loop_remove_timer(&connection->retry_timer);
btstack_linked_list_remove(&connections, (btstack_linked_item_t*) connection);
btstack_memory_avrcp_connection_free(connection);
}
static void avrcp_emit_connection_established(uint16_t avrcp_cid, bd_addr_t addr, hci_con_handle_t con_handle, uint8_t status){
btstack_assert(avrcp_callback != NULL);
uint8_t event[14];
int pos = 0;
event[pos++] = HCI_EVENT_AVRCP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = AVRCP_SUBEVENT_CONNECTION_ESTABLISHED;
event[pos++] = status;
little_endian_store_16(event, pos, avrcp_cid);
pos += 2;
reverse_bd_addr(addr,&event[pos]);
pos += 6;
little_endian_store_16(event, pos, con_handle);
pos += 2;
(*avrcp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
static void avrcp_emit_connection_closed(uint16_t avrcp_cid){
btstack_assert(avrcp_callback != NULL);
uint8_t event[5];
int pos = 0;
event[pos++] = HCI_EVENT_AVRCP_META;
event[pos++] = sizeof(event) - 2;
event[pos++] = AVRCP_SUBEVENT_CONNECTION_RELEASED;
little_endian_store_16(event, pos, avrcp_cid);
pos += 2;
(*avrcp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event));
}
uint16_t avrcp_sdp_query_browsing_l2cap_psm(void){
return sdp_query_context.browsing_l2cap_psm;
}
void avrcp_handle_sdp_client_query_attribute_value(uint8_t *packet){
des_iterator_t des_list_it;
des_iterator_t prot_it;
// Handle new SDP record
if (sdp_event_query_attribute_byte_get_record_id(packet) != sdp_query_context.record_id) {
sdp_query_context.record_id = sdp_event_query_attribute_byte_get_record_id(packet);
sdp_query_context.parse_sdp_record = 0;
// log_info("SDP Record: Nr: %d", record_id);
}
if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) {
attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet);
if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) {
switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) {
case BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST:
if (de_get_element_type(attribute_value) != DE_DES) break;
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t * element = des_iterator_get_element(&des_list_it);
if (de_get_element_type(element) != DE_UUID) continue;
uint32_t uuid = de_get_uuid32(element);
switch (uuid){
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_TARGET:
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL:
case BLUETOOTH_SERVICE_CLASS_AV_REMOTE_CONTROL_CONTROLLER:
sdp_query_context.parse_sdp_record = 1;
break;
default:
break;
}
}
break;
case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: {
if (!sdp_query_context.parse_sdp_record) break;
// log_info("SDP Attribute: 0x%04x", sdp_event_query_attribute_byte_get_attribute_id(packet));
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t *des_element;
uint8_t *element;
uint32_t uuid;
if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
des_element = des_iterator_get_element(&des_list_it);
des_iterator_init(&prot_it, des_element);
element = des_iterator_get_element(&prot_it);
if (de_get_element_type(element) != DE_UUID) continue;
uuid = de_get_uuid32(element);
des_iterator_next(&prot_it);
switch (uuid){
case BLUETOOTH_PROTOCOL_L2CAP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context.avrcp_l2cap_psm);
break;
case BLUETOOTH_PROTOCOL_AVCTP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context.avrcp_version);
break;
default:
break;
}
}
}
break;
case BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS: {
// log_info("SDP Attribute: 0x%04x", sdp_event_query_attribute_byte_get_attribute_id(packet));
if (!sdp_query_context.parse_sdp_record) break;
if (de_get_element_type(attribute_value) != DE_DES) break;
des_iterator_t des_list_0_it;
uint8_t *element_0;
des_iterator_init(&des_list_0_it, attribute_value);
element_0 = des_iterator_get_element(&des_list_0_it);
for (des_iterator_init(&des_list_it, element_0); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t *des_element;
uint8_t *element;
uint32_t uuid;
if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
des_element = des_iterator_get_element(&des_list_it);
des_iterator_init(&prot_it, des_element);
element = des_iterator_get_element(&prot_it);
if (de_get_element_type(element) != DE_UUID) continue;
uuid = de_get_uuid32(element);
des_iterator_next(&prot_it);
switch (uuid){
case BLUETOOTH_PROTOCOL_L2CAP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context.browsing_l2cap_psm);
break;
case BLUETOOTH_PROTOCOL_AVCTP:
if (!des_iterator_has_more(&prot_it)) continue;
de_element_get_uint16(des_iterator_get_element(&prot_it), &sdp_query_context.browsing_version);
break;
default:
break;
}
}
}
break;
default:
break;
}
}
} else {
log_error("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, sdp_event_query_attribute_byte_get_attribute_length(packet));
}
}
static void avrcp_handle_sdp_query_failed(avrcp_connection_t * connection, uint8_t status){
if (connection == NULL) return;
log_info("AVRCP: SDP query failed with status 0x%02x.", status);
avrcp_emit_connection_established(connection->avrcp_cid, connection->remote_addr, connection->con_handle, status);
avrcp_finalize_connection(connection);
}
static void avrcp_handle_sdp_query_succeeded(avrcp_connection_t * connection){
if (connection == NULL) return;
connection->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
connection->avrcp_l2cap_psm = sdp_query_context.avrcp_l2cap_psm;
connection->browsing_version = sdp_query_context.browsing_version;
connection->browsing_l2cap_psm = sdp_query_context.browsing_l2cap_psm;
}
static void avrcp_handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(packet_type);
UNUSED(channel);
UNUSED(size);
bool state_ok = true;
avrcp_connection_t * avrcp_target_connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, sdp_query_context.avrcp_cid);
if (!avrcp_target_connection || avrcp_target_connection->state != AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE) {
state_ok = false;
}
avrcp_connection_t * avrcp_controller_connection = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_CONTROLLER, sdp_query_context.avrcp_cid);
if (!avrcp_controller_connection || avrcp_controller_connection->state != AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE) {
state_ok = false;
}
if (!state_ok){
// something wrong, nevertheless, start next sdp query if this one is complete
if (hci_event_packet_get_type(packet) == SDP_EVENT_QUERY_COMPLETE){
(void) sdp_client_register_query_callback(&avrcp_handle_sdp_client_query_request);
}
return;
}
uint8_t status;
switch (hci_event_packet_get_type(packet)){
case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
avrcp_handle_sdp_client_query_attribute_value(packet);
return;
case SDP_EVENT_QUERY_COMPLETE:
status = sdp_event_query_complete_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
avrcp_handle_sdp_query_failed(avrcp_controller_connection, status);
avrcp_handle_sdp_query_failed(avrcp_target_connection, status);
break;
}
if (!sdp_query_context.avrcp_l2cap_psm){
avrcp_handle_sdp_query_failed(avrcp_controller_connection, SDP_SERVICE_NOT_FOUND);
avrcp_handle_sdp_query_failed(avrcp_target_connection, SDP_SERVICE_NOT_FOUND);
break;
}
avrcp_handle_sdp_query_succeeded(avrcp_controller_connection);
avrcp_handle_sdp_query_succeeded(avrcp_target_connection);
l2cap_create_channel(&avrcp_packet_handler, avrcp_target_connection->remote_addr, sdp_query_context.avrcp_l2cap_psm, l2cap_max_mtu(), NULL);
break;
default:
return;
}
// register the SDP Query request to check if there is another connection waiting for the query
// ignore ERROR_CODE_COMMAND_DISALLOWED because in that case, we already have requested an SDP callback
(void) sdp_client_register_query_callback(&avrcp_handle_sdp_client_query_request);
}
static avrcp_connection_t * avrcp_handle_incoming_connection_for_role(avrcp_role_t role, avrcp_connection_t * connection, bd_addr_t event_addr, hci_con_handle_t con_handle, uint16_t local_cid, uint16_t avrcp_cid){
if (connection == NULL){
connection = avrcp_create_connection(role, event_addr);
}
if (connection) {
connection->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
connection->l2cap_signaling_cid = local_cid;
connection->avrcp_cid = avrcp_cid;
connection->con_handle = con_handle;
btstack_run_loop_remove_timer(&connection->retry_timer);
}
return connection;
}
static void avrcp_handle_open_connection(avrcp_connection_t * connection, hci_con_handle_t con_handle, uint16_t local_cid, uint16_t l2cap_mtu){
connection->l2cap_signaling_cid = local_cid;
connection->l2cap_mtu = l2cap_mtu;
connection->con_handle = con_handle;
connection->incoming_declined = false;
connection->song_length_ms = 0xFFFFFFFF;
connection->song_position_ms = 0xFFFFFFFF;
connection->playback_status = AVRCP_PLAYBACK_STATUS_ERROR;
connection->state = AVCTP_CONNECTION_OPENED;
log_info("L2CAP_EVENT_CHANNEL_OPENED avrcp_cid 0x%02x, l2cap_signaling_cid 0x%02x, role %d, state %d", connection->avrcp_cid, connection->l2cap_signaling_cid, connection->role, connection->state);
}
static void avrcp_retry_timer_timeout_handler(btstack_timer_source_t * timer){
uint16_t avrcp_cid = (uint16_t)(uintptr_t) btstack_run_loop_get_timer_context(timer);
avrcp_connection_t * connection_controller = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_CONTROLLER, avrcp_cid);
if (connection_controller == NULL) return;
avrcp_connection_t * connection_target = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid);
if (connection_target == NULL) return;
if (connection_controller->state == AVCTP_CONNECTION_W2_L2CAP_RETRY){
connection_controller->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
connection_target->state = AVCTP_CONNECTION_W4_L2CAP_CONNECTED;
l2cap_create_channel(&avrcp_packet_handler, connection_controller->remote_addr, connection_controller->avrcp_l2cap_psm, l2cap_max_mtu(), NULL);
}
}
static void avrcp_retry_timer_start(avrcp_connection_t * connection){
btstack_run_loop_set_timer_handler(&connection->retry_timer, avrcp_retry_timer_timeout_handler);
btstack_run_loop_set_timer_context(&connection->retry_timer, (void *)(uintptr_t)connection->avrcp_cid);
// add some jitter/randomness to reconnect delay
uint32_t timeout = 100 + (btstack_run_loop_get_time_ms() & 0x7F);
btstack_run_loop_set_timer(&connection->retry_timer, timeout);
btstack_run_loop_add_timer(&connection->retry_timer);
}
static avrcp_frame_type_t avrcp_get_frame_type(uint8_t header){
return (avrcp_frame_type_t)((header & 0x02) >> 1);
}
static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
UNUSED(size);
bd_addr_t event_addr;
uint16_t local_cid;
uint16_t l2cap_mtu;
uint8_t status;
bool decline_connection;
bool outoing_active;
hci_con_handle_t con_handle;
avrcp_connection_t * connection_controller;
avrcp_connection_t * connection_target;
bool can_send;
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (hci_event_packet_get_type(packet)) {
case L2CAP_EVENT_INCOMING_CONNECTION:
btstack_assert(avrcp_controller_packet_handler != NULL);
btstack_assert(avrcp_target_packet_handler != NULL);
l2cap_event_incoming_connection_get_address(packet, event_addr);
local_cid = l2cap_event_incoming_connection_get_local_cid(packet);
con_handle = l2cap_event_incoming_connection_get_handle(packet);
outoing_active = false;
connection_target = avrcp_get_connection_for_bd_addr_for_role(AVRCP_TARGET, event_addr);
if (connection_target != NULL){
if (connection_target->state == AVCTP_CONNECTION_W4_L2CAP_CONNECTED){
outoing_active = true;
connection_target->incoming_declined = true;
}
}
connection_controller = avrcp_get_connection_for_bd_addr_for_role(AVRCP_CONTROLLER, event_addr);
if (connection_controller != NULL){
if (connection_controller->state == AVCTP_CONNECTION_W4_L2CAP_CONNECTED) {
outoing_active = true;
connection_controller->incoming_declined = true;
}
}
decline_connection = outoing_active;
if (decline_connection == false){
uint16_t avrcp_cid;
if ((connection_controller == NULL) || (connection_target == NULL)){
avrcp_cid = avrcp_get_next_cid(AVRCP_CONTROLLER);
} else {
avrcp_cid = connection_controller->avrcp_cid;
}
// create two connection objects (both)
connection_target = avrcp_handle_incoming_connection_for_role(AVRCP_TARGET, connection_target, event_addr, con_handle, local_cid, avrcp_cid);
connection_controller = avrcp_handle_incoming_connection_for_role(AVRCP_CONTROLLER, connection_controller, event_addr, con_handle, local_cid, avrcp_cid);
if ((connection_target == NULL) || (connection_controller == NULL)){
decline_connection = true;
if (connection_target) {
avrcp_finalize_connection(connection_target);
}
if (connection_controller) {
avrcp_finalize_connection(connection_controller);
}
}
}
if (decline_connection){
l2cap_decline_connection(local_cid);
} else {
log_info("AVRCP: L2CAP_EVENT_INCOMING_CONNECTION local cid 0x%02x, state %d", local_cid, connection_controller->state);
l2cap_accept_connection(local_cid);
}
break;
case L2CAP_EVENT_CHANNEL_OPENED:
l2cap_event_channel_opened_get_address(packet, event_addr);
status = l2cap_event_channel_opened_get_status(packet);
local_cid = l2cap_event_channel_opened_get_local_cid(packet);
l2cap_mtu = l2cap_event_channel_opened_get_remote_mtu(packet);
con_handle = l2cap_event_channel_opened_get_handle(packet);
connection_controller = avrcp_get_connection_for_bd_addr_for_role(AVRCP_CONTROLLER, event_addr);
connection_target = avrcp_get_connection_for_bd_addr_for_role(AVRCP_TARGET, event_addr);
// incoming: structs are already created in L2CAP_EVENT_INCOMING_CONNECTION
// outgoing: structs are cteated in avrcp_connect()
if ((connection_controller == NULL) || (connection_target == NULL)) {
break;
}
switch (status){
case ERROR_CODE_SUCCESS:
avrcp_handle_open_connection(connection_target, con_handle, local_cid, l2cap_mtu);
avrcp_handle_open_connection(connection_controller, con_handle, local_cid, l2cap_mtu);
avrcp_emit_connection_established(connection_controller->avrcp_cid, event_addr, con_handle, status);
return;
case L2CAP_CONNECTION_RESPONSE_RESULT_REFUSED_RESOURCES:
if (connection_controller->incoming_declined == true){
log_info("Incoming connection was declined, and the outgoing failed");
connection_controller->state = AVCTP_CONNECTION_W2_L2CAP_RETRY;
connection_controller->incoming_declined = false;
connection_target->state = AVCTP_CONNECTION_W2_L2CAP_RETRY;
connection_target->incoming_declined = false;
avrcp_retry_timer_start(connection_controller);
return;
}
break;
default:
break;
}
log_info("L2CAP connection to connection %s failed. status code 0x%02x", bd_addr_to_str(event_addr), status);
avrcp_emit_connection_established(connection_controller->avrcp_cid, event_addr, con_handle, status);
avrcp_finalize_connection(connection_controller);
avrcp_finalize_connection(connection_target);
break;
case L2CAP_EVENT_CHANNEL_CLOSED:
local_cid = l2cap_event_channel_closed_get_local_cid(packet);
connection_controller = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_CONTROLLER, local_cid);
connection_target = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, local_cid);
if ((connection_controller == NULL) || (connection_target == NULL)) {
break;
}
avrcp_emit_connection_closed(connection_controller->avrcp_cid);
avrcp_finalize_connection(connection_controller);
avrcp_finalize_connection(connection_target);
break;
case L2CAP_EVENT_CAN_SEND_NOW:
local_cid = l2cap_event_can_send_now_get_local_cid(packet);
can_send = true;
connection_target = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_TARGET, local_cid);
if ((connection_target != NULL) && connection_target->wait_to_send){
connection_target->wait_to_send = false;
(*avrcp_target_packet_handler)(HCI_EVENT_PACKET, channel, packet, size);
can_send = false;
}
connection_controller = avrcp_get_connection_for_l2cap_signaling_cid_for_role(AVRCP_CONTROLLER, local_cid);
if ((connection_controller != NULL) && connection_controller->wait_to_send){
if (can_send){
connection_controller->wait_to_send = false;
(*avrcp_controller_packet_handler)(HCI_EVENT_PACKET, channel, packet, size);
} else {
l2cap_request_can_send_now_event(local_cid);
}
}
break;
default:
break;
}
break;
case L2CAP_DATA_PACKET:
switch (avrcp_get_frame_type(packet[0])){
case AVRCP_RESPONSE_FRAME:
(*avrcp_controller_packet_handler)(packet_type, channel, packet, size);
break;
case AVRCP_COMMAND_FRAME:
default: // make compiler happy
(*avrcp_target_packet_handler)(packet_type, channel, packet, size);
break;
}
break;
default:
break;
}
}
uint8_t avrcp_disconnect(uint16_t avrcp_cid){
avrcp_connection_t * connection_controller = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_CONTROLLER, avrcp_cid);
if (!connection_controller){
return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
}
avrcp_connection_t * connection_target = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, avrcp_cid);
if (!connection_target){
return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER;
}
if (connection_controller->browsing_connection){
l2cap_disconnect(connection_controller->browsing_connection->l2cap_browsing_cid, 0);
}
l2cap_disconnect(connection_controller->l2cap_signaling_cid, 0);
return ERROR_CODE_SUCCESS;
}
static void avrcp_handle_start_sdp_client_query(void * context){
UNUSED(context);
btstack_linked_list_iterator_t it;
btstack_linked_list_iterator_init(&it, &connections);
while (btstack_linked_list_iterator_has_next(&it)){
avrcp_connection_t * connection = (avrcp_connection_t *)btstack_linked_list_iterator_next(&it);
if (connection->state != AVCTP_CONNECTION_W2_SEND_SDP_QUERY) continue;
connection->state = AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE;
// prevent triggering SDP query twice (for each role once)
avrcp_connection_t * connection_with_opposite_role;
switch (connection->role){
case AVRCP_CONTROLLER:
connection_with_opposite_role = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_TARGET, connection->avrcp_cid);
break;
case AVRCP_TARGET:
connection_with_opposite_role = avrcp_get_connection_for_avrcp_cid_for_role(AVRCP_CONTROLLER, connection->avrcp_cid);
break;
default:
btstack_assert(false);
return;
}
connection_with_opposite_role->state = AVCTP_CONNECTION_W4_SDP_QUERY_COMPLETE;
sdp_query_context.avrcp_l2cap_psm = 0;
sdp_query_context.avrcp_version = 0;
sdp_query_context.avrcp_cid = connection->avrcp_cid;
sdp_client_query_uuid16(&avrcp_handle_sdp_client_query_result, (uint8_t *) connection->remote_addr, BLUETOOTH_PROTOCOL_AVCTP);
return;
}
}
uint8_t avrcp_connect(bd_addr_t remote_addr, uint16_t * avrcp_cid){
btstack_assert(avrcp_controller_packet_handler != NULL);
btstack_assert(avrcp_target_packet_handler != NULL);
avrcp_connection_t * connection_controller = avrcp_get_connection_for_bd_addr_for_role(AVRCP_CONTROLLER, remote_addr);
if (connection_controller){
return ERROR_CODE_COMMAND_DISALLOWED;
}
avrcp_connection_t * connection_target = avrcp_get_connection_for_bd_addr_for_role(AVRCP_TARGET, remote_addr);
if (connection_target){
return ERROR_CODE_COMMAND_DISALLOWED;
}
uint16_t cid = avrcp_get_next_cid(AVRCP_CONTROLLER);
connection_controller = avrcp_create_connection(AVRCP_CONTROLLER, remote_addr);
if (!connection_controller) return BTSTACK_MEMORY_ALLOC_FAILED;
connection_target = avrcp_create_connection(AVRCP_TARGET, remote_addr);
if (!connection_target){
avrcp_finalize_connection(connection_controller);
return BTSTACK_MEMORY_ALLOC_FAILED;
}
if (avrcp_cid != NULL){
*avrcp_cid = cid;
}
connection_controller->state = AVCTP_CONNECTION_W2_SEND_SDP_QUERY;
connection_controller->avrcp_cid = cid;
connection_target->state = AVCTP_CONNECTION_W2_SEND_SDP_QUERY;
connection_target->avrcp_cid = cid;
avrcp_handle_sdp_client_query_request.callback = &avrcp_handle_start_sdp_client_query;
// ignore ERROR_CODE_COMMAND_DISALLOWED because in that case, we already have requested an SDP callback
(void) sdp_client_register_query_callback(&avrcp_handle_sdp_client_query_request);
return ERROR_CODE_SUCCESS;
}
void avrcp_init(void){
connections = NULL;
if (l2cap_service_registered) return;
int status = l2cap_register_service(&avrcp_packet_handler, BLUETOOTH_PSM_AVCTP, 0xffff, gap_get_security_level());
if (status != ERROR_CODE_SUCCESS) return;
l2cap_service_registered = true;
}
void avrcp_deinit(void){
avrcp_cid_counter = 0;
l2cap_service_registered = false;
(void) memset(&sdp_query_context, 0, sizeof(avrcp_sdp_query_context_t));
(void) memset(attribute_value,0, sizeof(attribute_value));
avrcp_callback = NULL;
connections = NULL;
avrcp_controller_packet_handler = NULL;
avrcp_target_packet_handler = NULL;
}
void avrcp_register_controller_packet_handler(btstack_packet_handler_t callback){
avrcp_controller_packet_handler = callback;
}
void avrcp_register_target_packet_handler(btstack_packet_handler_t callback){
avrcp_target_packet_handler = callback;
}
void avrcp_register_packet_handler(btstack_packet_handler_t callback){
btstack_assert(callback != NULL);
avrcp_callback = callback;
}
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
#define FUZZ_CID 0x44
#define FUZZ_CON_HANDLE 0x0001
static bd_addr_t remote_addr = { 0x33, 0x33, 0x33, 0x33, 0x33, 0x33 };
void avrcp_init_fuzz(void){
// setup avrcp connections for cid
avrcp_connection_t * connection_controller = avrcp_create_connection(AVRCP_CONTROLLER, remote_addr);
avrcp_connection_t * connection_target = avrcp_create_connection(AVRCP_TARGET, remote_addr);
avrcp_handle_open_connection(connection_controller, FUZZ_CON_HANDLE, FUZZ_CID, 999);
avrcp_handle_open_connection(connection_target, FUZZ_CON_HANDLE, FUZZ_CID, 999);
}
void avrcp_packet_handler_fuzz(uint8_t *packet, uint16_t size){
avrcp_packet_handler(L2CAP_DATA_PACKET, FUZZ_CID, packet, size);
}
#endif
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