/* * 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 * */ /* * panu_demo.c * Author: Ole Reinhardt */ /* 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 #include #include #include #include #include #include #include #include #include #ifdef __APPLE__ #include #include #include #include #endif #include #include #include #include #include #ifdef __linux #include #include #endif #include "btstack_memory.h" #include "btstack_event.h" #include "btstack_run_loop.h" #include "classic/sdp_client.h" #include "classic/sdp_util.h" #include "hci.h" #include "hci_cmd.h" #include "hci_dump.h" #include "l2cap.h" #include "pan.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, SDP_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) { 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) { 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 SDP_ServiceClassIDList: 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 SDP_PANU: case SDP_NAP: case SDP_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 0x0004: { 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 SDP_L2CAPProtocol: 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 SDP_BNEPProtocol: 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, PANU_UUID, 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 */ 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, SDP_BNEPProtocol); } 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); hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "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[]){ 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 -*- */