source: source/ariba/utility/bootstrap/modules/bluetoothsdp/BluetoothSdp.cpp

// [License]
// The Ariba-Underlay Copyright
//
// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)
//
// Institute of Telematics
// UniversitÀt Karlsruhe (TH)
// Zirkel 2, 76128 Karlsruhe
// Germany
//
// 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.
//
// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``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 THE ARIBA PROJECT 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.
//
// The views and conclusions contained in the software and documentation
// are those of the authors and should not be interpreted as representing
// official policies, either expressed or implied, of the Institute of
// Telematics.
// [License]

#include "BluetoothSdp.h"
#include "ariba/overlay/OverlayBootstrap.h"

#ifdef HAVE_LIBBLUETOOTH

// Attribute descriptors for SDP
// base was chosen randomly
#define SDP_SPOVNET_BASE                        0x4000
#define SDP_ATTR_SPOVNET_NAME           0x0000 + SDP_SPOVNET_BASE
#define SDP_ATTR_SPOVNET_INFO1          0x0001 + SDP_SPOVNET_BASE
#define SDP_ATTR_SPOVNET_INFO2          0x0002 + SDP_SPOVNET_BASE
#define SDP_ATTR_SPOVNET_INFO3          0x0003 + SDP_SPOVNET_BASE

// The SpoVNet unique identifier, this should be the same for all SpoVNet implementations
const uint8_t svc_uuid_int[] = {0x59, 0x29, 0x24, 0x34, 0x69, 0x42, 0x11, 0xde, 0x94,
                0x3e, 0x00, 0x21, 0x5d, 0xb4, 0xd8, 0x54};

const char *service_name = "SpoVNet";
const char *svc_dsc = "www.ariba-underlay.org";
const char *service_prov = "ITM Uni Karlsruhe";

#endif // HAVE_LIBBLUETOOTH


namespace ariba {
namespace utility {

#ifdef HAVE_LIBBLUETOOTH
static bdaddr_t bd_addr_any = {{0, 0, 0, 0, 0, 0}};
static bdaddr_t bd_addr_local = {{0, 0, 0, 0xff, 0xff, 0xff}};
#endif

use_logging_cpp(BluetoothSdp);
OverlayBootstrap* BluetoothSdp::CONNECTION_CHECKER = NULL;

BluetoothSdp::BluetoothSdp(BootstrapInformationCallback* _callback, string info)
        : BootstrapModule(_callback), scan_timer_(io_service_) {
        srand( time(NULL) );
#ifdef HAVE_LIBBLUETOOTH

        // This can be ignored, as the channel we really be saved in one
        // of the info strings (as an attribute)
        channel_ = 1;
#endif // HAVE_LIBBLUETOOTH
}

BluetoothSdp::~BluetoothSdp() {
}

string BluetoothSdp::getName() {
        return "BluetoothSdp";
}

string BluetoothSdp::getInformation() {
        return "bootstrap module based on bluetooth service discovery protocol";
}

bool BluetoothSdp::isFunctional() {
#ifdef HAVE_LIBBLUETOOTH
        return true;
#else
        return false;
#endif
}

void BluetoothSdp::start() {
#ifdef HAVE_LIBBLUETOOTH

        /*
         * Initializes and forks the scanner.
         */

        io_service_.post(boost::bind(&BluetoothSdp::bt_scan, this));
        t_ = boost::thread(boost::bind(&boost::asio::io_service::run, &io_service_));

#endif // HAVE_LIBBLUETOOTH
}

void BluetoothSdp::stop() {
#ifdef HAVE_LIBBLUETOOTH

        /*
         * Stops the scanner.
         */

        // not sure if this is thread safe
        io_service_.stop();
        t_.join();

        if(sdp_session_ != NULL)
                sdp_close(sdp_session_);

#endif // HAVE_LIBBLUETOOTH
}

void BluetoothSdp::publishService(string name, string info1, string info2,
                string info3) {
#ifdef HAVE_LIBBLUETOOTH

        /*
         * Publishes an SpoVNet SDP Service and
         * adds the arguments as info attributes.
         */

        logging_debug("registering SDP service");

        uint8_t rfcomm_channel = channel_;

        uuid_t root_uuid, l2cap_uuid, rfcomm_uuid, svc_uuid, svc_class_uuid;
        sdp_list_t *l2cap_list = 0, *rfcomm_list = 0, *root_list = 0, *proto_list =
                0, *access_proto_list = 0, *svc_class_list = 0, *profile_list = 0;
        sdp_data_t *channel = 0;
        sdp_profile_desc_t profile;
        sdp_record_t record = {0};
        sdp_session_ = 0;

        if((name.length() > 256) || (info1.length() > 256) || (info2.length() > 256) || (info3.length() > 256)) {
                logging_error("string argument too long, max size is 256");
                return;
        }

        // prepare the info attribute buffers
        //string namebuf, info1buf, info2buf, info3buf;
        uint8_t namelen, info1len, info2len, info3len;

        namelen = (uint8_t)name.length();
        info1len = (uint8_t)info1.length();
        info2len = (uint8_t)info2.length();
        info3len = (uint8_t)info3.length();

        // set the general service ID
        sdp_uuid128_create(&svc_uuid, &svc_uuid_int);
        sdp_set_service_id(&record, svc_uuid);

        // set the service class
        sdp_uuid16_create(&svc_class_uuid, SERIAL_PORT_SVCLASS_ID);
        svc_class_list = sdp_list_append(0, &svc_class_uuid);
        sdp_set_service_classes(&record, svc_class_list);

        // set the Bluetooth profile information
        sdp_uuid16_create(&profile.uuid, SERIAL_PORT_PROFILE_ID);
        profile.version = 0x0100;
        profile_list = sdp_list_append(0, &profile);
        sdp_set_profile_descs(&record, profile_list);

        // make the service record publicly browsable
        sdp_uuid16_create(&root_uuid, PUBLIC_BROWSE_GROUP);
        root_list = sdp_list_append(0, &root_uuid);
        sdp_set_browse_groups(&record, root_list);

        // set l2cap informatiint argc, char* argv[]on
        sdp_uuid16_create(&l2cap_uuid, L2CAP_UUID);
        l2cap_list = sdp_list_append(0, &l2cap_uuid);
        proto_list = sdp_list_append(0, l2cap_list);

        // register the RFCOMM channel for RFCOMM sockets
        sdp_uuid16_create(&rfcomm_uuid, RFCOMM_UUID);
        channel = sdp_data_alloc(SDP_UINT8, &rfcomm_channel);
        rfcomm_list = sdp_list_append(0, &rfcomm_uuid);
        sdp_list_append(rfcomm_list, channel);
        sdp_list_append(proto_list, rfcomm_list);

        access_proto_list = sdp_list_append(0, proto_list);
        sdp_set_access_protos(&record, access_proto_list);

        // set the name, provider, and description
        sdp_set_info_attr(&record, service_name, service_prov, svc_dsc);

        // add the spovnet attributes
        sdp_attr_add_new(&record, SDP_ATTR_SPOVNET_NAME, SDP_TEXT_STR8,
                        name.data());

        sdp_attr_add_new(&record, SDP_ATTR_SPOVNET_INFO1, SDP_TEXT_STR8,
                        info1.data());

        sdp_attr_add_new(&record, SDP_ATTR_SPOVNET_INFO2, SDP_TEXT_STR8,
                        info2.data());

        sdp_attr_add_new(&record, SDP_ATTR_SPOVNET_INFO3, SDP_TEXT_STR8,
                        info3.data());

        // connect to the local SDP server, register the service record
        if( sdp_session_ == NULL ){
                sdp_session_ = sdp_connect(&bd_addr_any, &bd_addr_local, SDP_RETRY_IF_BUSY);
        }

        if (sdp_session_ == NULL) {
                logging_error( "something is wrong with your SDP server, nothing registered: " << strerror(errno) );
        } else {
                int ret = sdp_record_register(sdp_session_, &record, 0);

                if(ret < 0){
                        logging_error("failed registering sdp record: " << strerror(errno));
                }else{
                        logging_debug("sdp record registered using session " << sdp_session_);
                }
        }

        // cleanup
        sdp_data_free(channel);
        sdp_list_free(l2cap_list, 0);
        sdp_list_free(rfcomm_list, 0);
        sdp_list_free(root_list, 0);
        sdp_list_free(access_proto_list, 0);
        sdp_list_free(svc_class_list, 0);
        sdp_list_free(profile_list, 0);

#endif // HAVE_LIBBLUETOOTH
}

void BluetoothSdp::revokeService(string name) {
#ifdef HAVE_LIBBLUETOOTH

        logging_debug("unregistering SDP service");
        sdp_close(sdp_session_);

#endif // HAVE_LIBBLUETOOTH
}

#ifdef HAVE_LIBBLUETOOTH

void BluetoothSdp::bt_scan() {

        //
        // scan for devices if we have no active rfcomm connections running.
        // otherwise we would break existing connections due to chipping seq
        //

        if(!haveConnections()){

                /*
                 * Scans for other bluetooth devices and starts a SDP search on them.
                 */

                logging_debug("scanning for peers");

                inquiry_info *ii = NULL;
                int max_rsp, num_rsp;
                int dev_id, sock, len, flags;
                int i;

                bdaddr_t address;
//              uint8_t channel;

                dev_id = hci_get_route(NULL);
                sock = hci_open_dev(dev_id);
                if (dev_id < 0 || sock < 0) {
                        logging_error("opening socket for device "
                                        << dev_id << " failed. can not scan for peers: " << strerror(errno));
                        return;
                }

                len = 8;
                max_rsp = 255;
                flags = IREQ_CACHE_FLUSH;
                ii = (inquiry_info*) malloc(max_rsp * sizeof(inquiry_info));

                num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags);
                if (num_rsp < 0)
                        logging_error("hci_inquiry failed with " << num_rsp << ": " << strerror(errno));

                for (i = 0; i < num_rsp; i++) {
                        address = (ii + i)->bdaddr;

                        string saddress = ba2string(&address);
                        string sname = ba2name(&address, sock);

                        logging_debug("found peer [" << saddress << "] [" << sname << "]");
                        sdp_search( address, sname );
                }

                free(ii);
                close(sock);

        } else {
                logging_debug("have active connections, no sdp searching");
        }

        int nextscan = (rand() % 10) + 5;
        logging_debug("next sdp scan try in " << nextscan << " seconds");

        scan_timer_.expires_from_now( boost::posix_time::seconds(nextscan) );
        scan_timer_.async_wait( boost::bind(&BluetoothSdp::bt_scan, this) );
}

void BluetoothSdp::sdp_search(bdaddr_t target, string devicename) {

        /*
         * Searches target for SDP records with the SpoVnet uuid
         * and extracts its info attributes.
         */

        int status;
        uuid_t svc_uuid;
        sdp_list_t *response_list, *search_list, *attrid_list;
        sdp_session_t *session = NULL;
        uint32_t range = 0x0000ffff;
        uint8_t port = 0;

        // connect to the SDP server running on the remote machine
        logging_debug("querying services from bt device ["
                        << ba2string(&target) << "] [" << devicename << "]");

        // prepare the buffers for the attributes
        char name[256], info1[256], info2[256], info3[256];

        session = sdp_connect(&bd_addr_any, &target, SDP_RETRY_IF_BUSY);

        if (session == NULL) {
                logging_error("failed to connect to SDP server at "
                                << ba2string(&target) << ": " << strerror(errno));
                return;
        }

        sdp_uuid128_create(&svc_uuid, &svc_uuid_int);
        search_list = sdp_list_append(0, &svc_uuid);
        attrid_list = sdp_list_append(0, &range);

        // get a list of service records that have UUID uuid_
        response_list = NULL;
        status = sdp_service_search_attr_req(session, search_list,
                        SDP_ATTR_REQ_RANGE, attrid_list, &response_list);

        if (status == 0) {
                sdp_list_t *proto_list = NULL;
                sdp_list_t *r = response_list;

                // go through each of the service records
                for ( ; r != NULL; r = r->next) {
                        sdp_record_t *rec = (sdp_record_t*) r->data;

                        // get a list of the protocol sequences
                        if (sdp_get_access_protos(rec, &proto_list) == 0) {

                                // get the RFCOMM port number
                                port = sdp_get_proto_port(proto_list, RFCOMM_UUID);

                                sdp_list_free(proto_list, 0);

                                sdp_get_string_attr(rec, SDP_ATTR_SPOVNET_NAME, (char*)&name, 256);
                                sdp_get_string_attr(rec, SDP_ATTR_SPOVNET_INFO1, (char*)&info1, 256);
                                sdp_get_string_attr(rec, SDP_ATTR_SPOVNET_INFO2, (char*)&info2, 256);
                                sdp_get_string_attr(rec, SDP_ATTR_SPOVNET_INFO3, (char*)&info3, 256);

                                logging_info("Remote peer name is: " << name);
                                logging_info("Remote peer info1 is: " << info1);
                                logging_info("Remote peer info2 is: " << info2);
                                logging_info("Remote peer info3 is: " << info3);

                                // Callback
                                callback->onBootstrapServiceFound(name, info1, info2, info3);
                        }
                        sdp_record_free(rec);
                }
        } else {
                logging_error("sdp_service_search_attr_req failed with timeout: " << strerror(errno));
        }

        sdp_list_free(response_list, 0);
        sdp_list_free(search_list, 0);
        sdp_list_free(attrid_list, 0);
        sdp_close(session);
}

string BluetoothSdp::ba2string(bdaddr_t* ba) {
        /*
         * Returns a string holding the bt adress in human readable form.
         */
        char str[32] = { 0 };
        ba2str(ba, str);
        string result = str;
        return result;
}

string BluetoothSdp::ba2name(bdaddr_t* ba, int sock){

        char name[256] = {0};
        memset(name, 0, sizeof(name));

        if( hci_read_remote_name(sock, ba, sizeof(name), name, 0) < 0 )
                strcpy(name, "unknown");

        string result = name;
        return result;
}

bool BluetoothSdp::haveConnections(){

        // TODO: currently we check for overlay connectivity

        if(CONNECTION_CHECKER == NULL) return false;
        return CONNECTION_CHECKER->haveOverlayConnections();


        /* TODO: this will check for rfcomm connections
        struct hci_conn_list_req* cl = NULL;
        struct hci_conn_info* ci = NULL;

        int btsock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
        if(btsock <  0){
                logging_error("failed getting bluetooth raw socket");
                return true; // return true to be safe here and not perform sdp scan
        }

        cl = (struct hci_conn_list_req*)malloc(10 * sizeof(struct hci_conn_info) + sizeof(struct hci_conn_list_req));

        cl->dev_id = hci_get_route(NULL);;
        cl->conn_num = 10;
        ci = cl->conn_info;

        if(ioctl(btsock, HCIGETCONNLIST, (void*)cl)){
                logging_warn("could not get active rfcomm connections");
                return true; // return true to be safe here and not perform sdp scan
        }

        bool haveconn = (cl->conn_num > 0);
        logging_debug("we have " << cl->conn_num << " active hci connections");
        free(cl);
        close(btsock);

        return haveconn;
        */
}

#endif // HAVE_LIBBLUETOOTH

}} //namespace ariba, utility