/*
* Copyright (C) 2014 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__ "panu_demo.c"
/*
* panu_demo.c
* Author: Ole Reinhardt <ole.reinhardt@kernelconcepts.de>
*/
/* EXAMPLE_START(panu_demo): PANU Demo
*
* @text This example implements both a PANU client and a server. In server mode, it
* sets up a BNEP server and registers a PANU SDP record and waits for incoming connections.
* In client mode, it connects to a remote device, does an SDP Query to identify the PANU
* service and initiates a BNEP connection.
*/
#include "btstack_config.h"
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <ifaddrs.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <net/if_arp.h>
#ifdef __APPLE__
#include <net/if.h>
#include <net/if_types.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#endif
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef __linux
#include <linux/if.h>
#include <linux/if_tun.h>
#endif
#include "btstack.h"
static int record_id = -1;
static uint16_t bnep_l2cap_psm = 0;
static uint32_t bnep_remote_uuid = 0;
static uint16_t bnep_version = 0;
static uint16_t bnep_cid = 0;
static uint8_t attribute_value[1000];
static const unsigned int attribute_value_buffer_size = sizeof(attribute_value);
//static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
// static bd_addr_t remote = {0xE0,0x06,0xE6,0xBB,0x95,0x79}; // Ole Thinkpad
static bd_addr_t remote = {0x84,0x38,0x35,0x65,0xD1,0x15}; // MacBook 2013
static int tap_fd = -1;
static uint8_t network_buffer[BNEP_MTU_MIN];
static size_t network_buffer_len = 0;
#ifdef __APPLE__
// tuntaposx provides fixed set of tapX devices
static const char * tap_dev = "/dev/tap0";
static char tap_dev_name[16] = "tap0";
#endif
#ifdef __linux
// Linux uses single control device to bring up tunX or tapX interface
static const char * tap_dev = "/dev/net/tun";
static char tap_dev_name[16] = "bnep%d";
#endif
static btstack_data_source_t tap_dev_ds;
static btstack_packet_callback_registration_t hci_event_callback_registration;
/* @section Main application configuration
*
* @text In the application configuration, L2CAP and BNEP are initialized and a BNEP service, for server mode,
* is registered, before the Bluetooth stack gets started, as shown in Listing PanuSetup.
*/
/* LISTING_START(PanuSetup): Panu setup */
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static void panu_setup(void){
// register for HCI events
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
// Initialize L2CAP
l2cap_init();
// Initialise BNEP
bnep_init();
// Minimum L2CAP MTU for bnep is 1691 bytes
bnep_register_service(packet_handler, BLUETOOTH_SERVICE_CLASS_PANU, 1691);
}
/* LISTING_END */
/* @section TUN / TAP interface routines
*
* @text This example requires a TUN/TAP interface to connect the Bluetooth network interface
* with the native system. It has been tested on Linux and OS X, but should work on any
* system that provides TUN/TAP with minor modifications.
*
* On Linux, TUN/TAP is available by default. On OS X, tuntaposx from
* http://tuntaposx.sourceforge.net needs to be installed.
*
* The *tap_alloc* function sets up a virtual network interface with the given Bluetooth Address.
* It is rather low-level as it sets up and configures a network interface.
*/
static int tap_alloc(char *dev, bd_addr_t bd_addr)
{
struct ifreq ifr;
int fd_dev;
int fd_socket;
if( (fd_dev = open(tap_dev, O_RDWR)) < 0 ) {
fprintf(stderr, "TAP: Error opening %s: %s\n", tap_dev, strerror(errno));
return -1;
}
#ifdef __linux
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if( *dev ) {
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
}
int err;
if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) {
fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno));
close(fd_dev);
return -1;
}
strcpy(dev, ifr.ifr_name);
#endif
#ifdef __APPLE__
dev = tap_dev_name;
#endif
fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd_socket < 0) {
close(fd_dev);
fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno));
return -1;
}
// Configure the MAC address of the newly created bnep(x)
// device to the local bd_address
memset (&ifr, 0, sizeof(struct ifreq));
strcpy(ifr.ifr_name, dev);
#ifdef __linux
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t));
if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno));
exit(1);
return -1;
}
#endif
#ifdef __APPLE__
ifr.ifr_addr.sa_len = ETHER_ADDR_LEN;
ifr.ifr_addr.sa_family = AF_LINK;
(void)memcpy(ifr.ifr_addr.sa_data, bd_addr, ETHER_ADDR_LEN);
if (ioctl(fd_socket, SIOCSIFLLADDR, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno));
exit(1);
return -1;
}
#endif
// Bring the interface up
if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno));
return -1;
}
if ((ifr.ifr_flags & IFF_UP) == 0) {
ifr.ifr_flags |= IFF_UP;
if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno));
return -1;
}
}
close(fd_socket);
return fd_dev;
}
/*
* @text Listing processTapData shows how a packet is received from the TAP network interface
* and forwarded over the BNEP connection.
*
* After successfully reading a network packet, the call to
* the *bnep_can_send_packet_now* function checks, if BTstack can forward
* a network packet now. If that's not possible, the received data stays
* in the network buffer and the data source elements is removed from the
* run loop. The *process_tap_dev_data* function will not be called until
* the data source is registered again. This provides a basic flow control.
*/
/* LISTING_START(processTapData): Process incoming network packets */
static void process_tap_dev_data(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type)
{
UNUSED(ds);
UNUSED(callback_type);
ssize_t len;
len = read(ds->fd, network_buffer, sizeof(network_buffer));
if (len <= 0){
fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno));
return;
}
network_buffer_len = len;
if (bnep_can_send_packet_now(bnep_cid)) {
bnep_send(bnep_cid, network_buffer, network_buffer_len);
network_buffer_len = 0;
} else {
// park the current network packet
btstack_run_loop_remove_data_source(&tap_dev_ds);
}
return;
}
/* LISTING_END */
// PANU client routines
static char * get_string_from_data_element(uint8_t * element){
de_size_t de_size = de_get_size_type(element);
int pos = de_get_header_size(element);
int len = 0;
switch (de_size){
case DE_SIZE_VAR_8:
len = element[1];
break;
case DE_SIZE_VAR_16:
len = big_endian_read_16(element, 1);
break;
default:
break;
}
char * str = (char*)malloc(len+1);
memcpy(str, &element[pos], len);
str[len] ='\0';
return str;
}
/* @section SDP parser callback
*
* @text The SDP parsers retrieves the BNEP PAN UUID as explained in
* Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}.
*/
static void 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);
des_iterator_t des_list_it;
des_iterator_t prot_it;
char *str;
switch (hci_event_packet_get_type(packet)){
case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
// Handle new SDP record
if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id) {
record_id = sdp_event_query_attribute_byte_get_record_id(packet);
printf("SDP Record: Nr: %d\n", 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_PANU:
case BLUETOOTH_SERVICE_CLASS_NAP:
case BLUETOOTH_SERVICE_CLASS_GN:
printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid);
bnep_remote_uuid = uuid;
break;
default:
break;
}
}
break;
case 0x0100:
case 0x0101:
str = get_string_from_data_element(attribute_value);
printf("SDP Attribute: 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str);
free(str);
break;
case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: {
printf("SDP Attribute: 0x%04x\n", 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);
switch (uuid){
case BLUETOOTH_PROTOCOL_L2CAP:
if (!des_iterator_has_more(&prot_it)) continue;
des_iterator_next(&prot_it);
de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm);
break;
case BLUETOOTH_PROTOCOL_BNEP:
if (!des_iterator_has_more(&prot_it)) continue;
des_iterator_next(&prot_it);
de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version);
break;
default:
break;
}
}
printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version);
/* Create BNEP connection */
bnep_connect(packet_handler, remote, bnep_l2cap_psm, BLUETOOTH_SERVICE_CLASS_PANU, bnep_remote_uuid);
}
break;
default:
break;
}
}
} else {
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));
}
break;
case SDP_EVENT_QUERY_COMPLETE:
fprintf(stderr, "General query done with status %d.\n", sdp_event_query_complete_get_status(packet));
break;
}
}
/*
* @section Packet Handler
*
* @text The packet handler responds to various HCI Events.
*/
/* LISTING_START(packetHandler): Packet Handler */
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
{
/* LISTING_PAUSE */
UNUSED(channel);
int rc;
uint8_t event;
bd_addr_t event_addr;
bd_addr_t local_addr;
uint16_t uuid_source;
uint16_t uuid_dest;
uint16_t mtu;
/* LISTING_RESUME */
switch (packet_type) {
case HCI_EVENT_PACKET:
event = hci_event_packet_get_type(packet);
switch (event) {
/* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING
* is received and the example is started in client mode, the remote SDP BNEP query is started.
*/
case BTSTACK_EVENT_STATE:
if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
printf("Start SDP BNEP query.\n");
sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, BLUETOOTH_PROTOCOL_BNEP);
}
break;
/* LISTING_PAUSE */
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);
gap_pin_code_response(event_addr, "0000");
break;
case HCI_EVENT_USER_CONFIRMATION_REQUEST:
// inform about user confirmation request
printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8));
printf("SSP User Confirmation Auto accept\n");
break;
/* LISTING_RESUME */
/* @text BNEP_EVENT_CHANNEL_OPENED is received after a BNEP connection was established or
* or when the connection fails. The status field returns the error code.
*
* The TAP network interface is then configured. A data source is set up and registered with the
* run loop to receive Ethernet packets from the TAP interface.
*
* The event contains both the source and destination UUIDs, as well as the MTU for this connection and
* the BNEP Channel ID, which is used for sending Ethernet packets over BNEP.
*/
case BNEP_EVENT_CHANNEL_OPENED:
if (bnep_event_channel_opened_get_status(packet)) {
printf("BNEP channel open failed, status %02x\n", bnep_event_channel_opened_get_status(packet));
} else {
bnep_cid = bnep_event_channel_opened_get_bnep_cid(packet);
uuid_source = bnep_event_channel_opened_get_source_uuid(packet);
uuid_dest = bnep_event_channel_opened_get_destination_uuid(packet);
mtu = bnep_event_channel_opened_get_mtu(packet);
//bt_flip_addr(event_addr, &packet[9]);
memcpy(&event_addr, &packet[11], sizeof(bd_addr_t));
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);
/* Create the tap interface */
gap_local_bd_addr(local_addr);
tap_fd = tap_alloc(tap_dev_name, local_addr);
if (tap_fd < 0) {
printf("Creating BNEP tap device failed: %s\n", strerror(errno));
} else {
printf("BNEP device \"%s\" allocated.\n", tap_dev_name);
/* Create and register a new runloop data source */
btstack_run_loop_set_data_source_fd(&tap_dev_ds, tap_fd);
btstack_run_loop_set_data_source_handler(&tap_dev_ds, &process_tap_dev_data);
btstack_run_loop_add_data_source(&tap_dev_ds);
}
}
break;
/* @text If there is a timeout during the connection setup, BNEP_EVENT_CHANNEL_TIMEOUT will be received
* and the BNEP connection will be closed
*/
case BNEP_EVENT_CHANNEL_TIMEOUT:
printf("BNEP channel timeout! Channel will be closed\n");
break;
/* @text BNEP_EVENT_CHANNEL_CLOSED is received when the connection gets closed.
*/
case BNEP_EVENT_CHANNEL_CLOSED:
printf("BNEP channel closed\n");
btstack_run_loop_remove_data_source(&tap_dev_ds);
if (tap_fd > 0) {
close(tap_fd);
tap_fd = -1;
}
break;
/* @text BNEP_EVENT_CAN_SEND_NOW indicates that a new packet can be send. This triggers the retry of a
* parked network packet. If this succeeds, the data source element is added to the run loop again.
*/
case BNEP_EVENT_CAN_SEND_NOW:
// Check for parked network packets and send it out now
if (network_buffer_len > 0) {
bnep_send(bnep_cid, network_buffer, network_buffer_len);
network_buffer_len = 0;
// Re-add the tap device data source
btstack_run_loop_add_data_source(&tap_dev_ds);
}
break;
default:
break;
}
break;
/* @text Ethernet packets from the remote device are received in the packet handler with type BNEP_DATA_PACKET.
* It is forwarded to the TAP interface.
*/
case BNEP_DATA_PACKET:
// Write out the ethernet frame to the tap device
if (tap_fd > 0) {
rc = write(tap_fd, packet, size);
if (rc < 0) {
fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno));
} else
if (rc != size) {
fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size);
}
}
break;
default:
break;
}
}
/* LISTING_END */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
(void)argc;
(void)argv;
printf("Client HCI init done\n");
panu_setup();
// Turn on the device
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */
/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */