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extracted att_server

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matthias.ringwald@gmail.com 2014-01-05 21:39:26 +00:00
parent 696564b866
commit 3d210f8217
4 changed files with 314 additions and 166 deletions
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245
ble/att_server.c Normal file
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@ -0,0 +1,245 @@
/*
* Copyright (C) 2011-2012 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 MATTHIAS RINGWALD 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
*
*/
//
// ATT Server Globals
//
#include "att_server.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include <btstack/run_loop.h>
#include "debug.h"
#include "btstack_memory.h"
#include "hci.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "sm.h"
#include "att.h"
#include "att_server.h"
#include "gap_le.h"
#include "central_device_db.h"
static att_connection_t att_connection;
typedef enum {
ATT_SERVER_IDLE,
ATT_SERVER_REQUEST_RECEIVED,
ATT_SERVER_W4_SIGNED_WRITE_VALIDATION,
} att_server_state_t;
static void att_run(void);
static att_server_state_t att_server_state;
static uint16_t att_request_handle = 0;
static uint16_t att_request_size = 0;
static uint8_t att_request_buffer[28];
static int att_ir_central_device_db_index = -1;
static int att_ir_lookup_active = 0;
static btstack_packet_handler_t att_client_packet_handler = NULL;
static void att_event_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (packet[0]) {
case DAEMON_EVENT_HCI_PACKET_SENT:
att_run();
break;
case HCI_EVENT_LE_META:
switch (packet[2]) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
// reset connection MTU
att_connection.mtu = 23;
break;
default:
break;
}
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
// restart advertising if we have been connected before
// -> avoid sending advertise enable a second time before command complete was received
att_server_state = ATT_SERVER_IDLE;
att_request_handle = 0;
break;
case SM_IDENTITY_RESOLVING_STARTED:
att_ir_lookup_active = 1;
break;
case SM_IDENTITY_RESOLVING_SUCCEEDED:
att_ir_lookup_active = 0;
att_ir_central_device_db_index = ((sm_event_identity_resolving_t*) packet)->central_device_db_index;
att_run();
break;
case SM_IDENTITY_RESOLVING_FAILED:
att_ir_lookup_active = 0;
att_ir_central_device_db_index = -1;
att_run();
break;
default:
break;
}
}
if (att_client_packet_handler){
att_client_packet_handler(packet_type, channel, packet, size);
}
}
static void att_signed_write_handle_cmac_result(uint8_t hash[8]){
if (att_server_state != ATT_SERVER_W4_SIGNED_WRITE_VALIDATION) return;
if (memcmp(hash, &att_request_buffer[att_request_size-8], 8)){
printf("ATT Signed Write, invalid signature\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// update sequence number
uint32_t counter_packet = READ_BT_32(att_request_buffer, att_request_size-12);
central_device_db_counter_set(att_ir_central_device_db_index, counter_packet+1);
// just treat signed write command as simple write command after validation
att_request_buffer[0] = ATT_WRITE_COMMAND;
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_run();
}
static void att_run(void){
switch (att_server_state){
case ATT_SERVER_IDLE:
case ATT_SERVER_W4_SIGNED_WRITE_VALIDATION:
return;
case ATT_SERVER_REQUEST_RECEIVED:
if (att_request_buffer[0] == ATT_SIGNED_WRITE_COMAND){
printf("ATT Signed Write!\n");
if (!sm_cmac_ready()) {
printf("ATT Signed Write, sm_cmac engine not ready. Abort\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
if (att_request_size < (3 + 12)) {
printf("ATT Signed Write, request to short. Abort.\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
if (att_ir_lookup_active){
return;
}
if (att_ir_central_device_db_index < 0){
printf("ATT Signed Write, CSRK not available\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// check counter
uint32_t counter_packet = READ_BT_32(att_request_buffer, att_request_size-12);
uint32_t counter_db = central_device_db_counter_get(att_ir_central_device_db_index);
printf("ATT Signed Write, DB counter %u, packet counter %u\n", counter_db, counter_packet);
if (counter_packet < counter_db){
printf("ATT Signed Write, db reports higher counter, abort\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// signature is { sequence counter, secure hash }
sm_key_t csrk;
central_device_db_csrk(att_ir_central_device_db_index, csrk);
att_server_state = ATT_SERVER_W4_SIGNED_WRITE_VALIDATION;
sm_cmac_start(csrk, att_request_size - 8, att_request_buffer, att_signed_write_handle_cmac_result);
return;
}
if (!hci_can_send_packet_now(HCI_ACL_DATA_PACKET)) return;
uint8_t att_response_buffer[28];
uint16_t att_response_size = att_handle_request(&att_connection, att_request_buffer, att_request_size, att_response_buffer);
att_server_state = ATT_SERVER_IDLE;
if (att_response_size == 0) return;
l2cap_send_connectionless(att_request_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, att_response_buffer, att_response_size);
break;
}
}
static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){
if (packet_type != ATT_DATA_PACKET) return;
// check size
if (size > sizeof(att_request_buffer)) return;
// last request still in processing?
if (att_server_state != ATT_SERVER_IDLE) return;
// store request
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_request_size = size;
att_request_handle = handle;
memcpy(att_request_buffer, packet, size);
att_run();
}
void att_server_init(uint8_t const * db, att_read_callback_t read_callback, att_write_callback_t write_callback){
sm_register_packet_handler(att_event_packet_handler);
l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL);
att_server_state = ATT_SERVER_IDLE;
att_set_db(db);
att_set_read_callback(read_callback);
att_set_write_callback(write_callback);
}
void att_server_register_packet_handler(btstack_packet_handler_t handler){
att_client_packet_handler = handler;
}

43
ble/att_server.h Normal file
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@ -0,0 +1,43 @@
/*
* Copyright (C) 2011-2012 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 MATTHIAS RINGWALD 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
*
*/
#pragma once
#include <btstack/btstack.h>
#include <stdint.h>
#include "att.h"
void att_server_init(uint8_t const * db, att_read_callback_t read_callback, att_write_callback_t write_callback);
void att_server_register_packet_handler(btstack_packet_handler_t handler);

3
example/libusb/Makefile
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@ -29,6 +29,7 @@ COMMON = \
${BTSTACK_ROOT}/src/sdp_query_util.c \
${BTSTACK_ROOT}/src/sdp_query_rfcomm.c \
${BTSTACK_ROOT}/ble/att.c \
${BTSTACK_ROOT}/ble/att_server.c \
${BTSTACK_ROOT}/ble/sm.c \
${BTSTACK_ROOT}/ble/central_device_db_memory.c \
@ -43,7 +44,7 @@ CC2564_OBJ = $(CC2564:.c=.o)
# create firmware image from common objects and example source file
all: ../../include/btstack/version.h ble_client ble_client_uart sdp_rfcomm_query sdp_general_query spp_counter ble_server ble_client
all: ../../include/btstack/version.h ble_client ble_client_uart sdp_rfcomm_query sdp_general_query spp_counter ble_peripheral
#spp-usb l2cap-server-usb l2cap-client-usb l2cap-server-uart l2cap-client-uart

189
example/libusb/ble_peripheral.c
View File

@ -59,37 +59,29 @@
#include "sm.h"
#include "att.h"
#include "att_server.h"
#include "gap_le.h"
#include "central_device_db.h"
//
// ATT Server Globals
//
///------
static int advertisements_enabled = 0;
// test profile
#include "profile.h"
static att_connection_t att_connection;
typedef enum {
ATT_SERVER_IDLE,
ATT_SERVER_REQUEST_RECEIVED,
ATT_SERVER_W4_SIGNED_WRITE_VALIDATION,
} att_server_state_t;
static void att_run(void);
static att_server_state_t att_server_state;
static uint16_t att_request_handle = 0;
static uint16_t att_request_size = 0;
static uint8_t att_request_buffer[28];
static int att_advertisements_enabled = 0;
static int att_ir_central_device_db_index = -1;
static int att_ir_lookup_active = 0;
// write requests
static void att_write_callback(uint16_t handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size, signature_t * signature){
printf("WRITE Callback, handle %04x\n", handle);
switch(handle){
case 0x000b:
buffer[buffer_size]=0;
printf("New text: %s\n", buffer);
break;
case 0x000d:
printf("New value: %u\n", buffer[0]);
break;
}
}
static void app_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
@ -108,16 +100,10 @@ static void app_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *
}
break;
case DAEMON_EVENT_HCI_PACKET_SENT:
att_run();
break;
case HCI_EVENT_LE_META:
switch (packet[2]) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
// reset connection MTU
att_connection.mtu = 23;
att_advertisements_enabled = 0;
advertisements_enabled = 0;
break;
default:
@ -128,12 +114,10 @@ static void app_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *
case HCI_EVENT_DISCONNECTION_COMPLETE:
// restart advertising if we have been connected before
// -> avoid sending advertise enable a second time before command complete was received
if (att_advertisements_enabled == 0) {
if (advertisements_enabled == 0) {
hci_send_cmd(&hci_le_set_advertise_enable, 1);
att_advertisements_enabled = 1;
advertisements_enabled = 1;
}
att_server_state = ATT_SERVER_IDLE;
att_request_handle = 0;
break;
case HCI_EVENT_COMMAND_COMPLETE:
@ -145,137 +129,16 @@ static void app_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *
if (COMMAND_COMPLETE_EVENT(packet, hci_le_set_scan_response_data)){
// only needed for BLE Peripheral
hci_send_cmd(&hci_le_set_advertise_enable, 1);
att_advertisements_enabled = 1;
advertisements_enabled = 1;
break;
}
break;
case SM_IDENTITY_RESOLVING_STARTED:
att_ir_lookup_active = 1;
break;
case SM_IDENTITY_RESOLVING_SUCCEEDED:
att_ir_lookup_active = 0;
att_ir_central_device_db_index = ((sm_event_identity_resolving_t*) packet)->central_device_db_index;
att_run();
break;
case SM_IDENTITY_RESOLVING_FAILED:
att_ir_lookup_active = 0;
att_ir_central_device_db_index = -1;
att_run();
break;
default:
break;
}
}
}
static void att_signed_write_handle_cmac_result(uint8_t hash[8]){
if (att_server_state != ATT_SERVER_W4_SIGNED_WRITE_VALIDATION) return;
if (memcmp(hash, &att_request_buffer[att_request_size-8], 8)){
printf("ATT Signed Write, invalid signature\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// update sequence number
uint32_t counter_packet = READ_BT_32(att_request_buffer, att_request_size-12);
central_device_db_counter_set(att_ir_central_device_db_index, counter_packet+1);
// just treat signed write command as simple write command after validation
att_request_buffer[0] = ATT_WRITE_COMMAND;
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_run();
}
static void att_run(void){
switch (att_server_state){
case ATT_SERVER_IDLE:
case ATT_SERVER_W4_SIGNED_WRITE_VALIDATION:
return;
case ATT_SERVER_REQUEST_RECEIVED:
if (att_request_buffer[0] == ATT_SIGNED_WRITE_COMAND){
printf("ATT Signed Write!\n");
if (!sm_cmac_ready()) {
printf("ATT Signed Write, sm_cmac engine not ready. Abort\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
if (att_request_size < (3 + 12)) {
printf("ATT Signed Write, request to short. Abort.\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
if (att_ir_lookup_active){
return;
}
if (att_ir_central_device_db_index < 0){
printf("ATT Signed Write, CSRK not available\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// check counter
uint32_t counter_packet = READ_BT_32(att_request_buffer, att_request_size-12);
uint32_t counter_db = central_device_db_counter_get(att_ir_central_device_db_index);
printf("ATT Signed Write, DB counter %u, packet counter %u\n", counter_db, counter_packet);
if (counter_packet < counter_db){
printf("ATT Signed Write, db reports higher counter, abort\n");
att_server_state = ATT_SERVER_IDLE;
return;
}
// signature is { sequence counter, secure hash }
sm_key_t csrk;
central_device_db_csrk(att_ir_central_device_db_index, csrk);
att_server_state = ATT_SERVER_W4_SIGNED_WRITE_VALIDATION;
sm_cmac_start(csrk, att_request_size - 8, att_request_buffer, att_signed_write_handle_cmac_result);
return;
}
if (!hci_can_send_packet_now(HCI_ACL_DATA_PACKET)) return;
uint8_t att_response_buffer[28];
uint16_t att_response_size = att_handle_request(&att_connection, att_request_buffer, att_request_size, att_response_buffer);
att_server_state = ATT_SERVER_IDLE;
if (att_response_size == 0) return;
l2cap_send_connectionless(att_request_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL, att_response_buffer, att_response_size);
break;
}
}
static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){
if (packet_type != ATT_DATA_PACKET) return;
// check size
if (size > sizeof(att_request_buffer)) return;
// last request still in processing?
if (att_server_state != ATT_SERVER_IDLE) return;
// store request
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_request_size = size;
att_request_handle = handle;
memcpy(att_request_buffer, packet, size);
att_run();
}
// write requests
static void att_write_callback(uint16_t handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size, signature_t * signature){
printf("WRITE Callback, handle %04x\n", handle);
switch(handle){
case 0x000b:
buffer[buffer_size]=0;
printf("New text: %s\n", buffer);
break;
case 0x000d:
printf("New value: %u\n", buffer[0]);
break;
}
}
void setup(void){
/// GET STARTED with BTstack ///
btstack_memory_init();
@ -294,13 +157,6 @@ void setup(void){
// set up l2cap_le
l2cap_init();
// set up ATT
l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL);
att_server_state = ATT_SERVER_IDLE;
att_set_db(profile_data);
att_set_write_callback(att_write_callback);
// setup central device db
central_device_db_init();
@ -309,7 +165,10 @@ void setup(void){
sm_set_io_capabilities(IO_CAPABILITY_NO_INPUT_NO_OUTPUT);
sm_set_authentication_requirements( SM_AUTHREQ_BONDING );
sm_set_request_security(1);
sm_register_packet_handler(app_packet_handler);
// setup ATT server
att_server_init(profile_data, NULL, att_write_callback);
att_server_register_packet_handler(app_packet_handler);
}
int main(void)