/*      $NetBSD: client.c,v 1.7 2012/10/14 08:31:35 plunky Exp $        */

/*-
* Copyright (c) 2008-2009 Iain Hibbert
* All rights reserved.
*
* 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 AUTHOR ``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 AUTHOR 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.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: client.c,v 1.7 2012/10/14 08:31:35 plunky Exp $");

#include <bluetooth.h>
#include <errno.h>
#include <sdp.h>
#include <unistd.h>

#include "btpand.h"
#include "bnep.h"

__dead static void client_down(channel_t *);
static void client_query(void);

void
client_init(void)
{
       struct sockaddr_bt sa;
       channel_t *chan;
       socklen_t len;
       int fd, n;
       uint16_t mru, mtu;

       if (bdaddr_any(&remote_bdaddr))
               return;

       if (service_type)
               client_query();

       fd = socket(PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP);
       if (fd == -1) {
               log_err("Could not open L2CAP socket: %m");
               exit(EXIT_FAILURE);
       }

       memset(&sa, 0, sizeof(sa));
       sa.bt_family = AF_BLUETOOTH;
       sa.bt_len = sizeof(sa);
       bdaddr_copy(&sa.bt_bdaddr, &local_bdaddr);
       if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
               log_err("Could not bind client socket: %m");
               exit(EXIT_FAILURE);
       }

       if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_LM,
           &l2cap_mode, sizeof(l2cap_mode)) == -1) {
               log_err("Could not set link mode (0x%4.4x): %m", l2cap_mode);
               exit(EXIT_FAILURE);
       }

       mru = BNEP_MTU_MIN;
       if (setsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU,
           &mru, sizeof(mru)) == -1) {
               log_err("Could not set L2CAP IMTU (%d): %m", mru);
               exit(EXIT_FAILURE);
       }

       log_info("Opening connection to service 0x%4.4x at %s",
           service_class, bt_ntoa(&remote_bdaddr, NULL));

       sa.bt_psm = l2cap_psm;
       bdaddr_copy(&sa.bt_bdaddr, &remote_bdaddr);
       if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
               log_err("Could not connect: %m");
               exit(EXIT_FAILURE);
       }

       len = sizeof(mru);
       if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_IMTU, &mru, &len) == -1) {
               log_err("Could not get IMTU: %m");
               exit(EXIT_FAILURE);
       }
       if (mru < BNEP_MTU_MIN) {
               log_err("L2CAP IMTU too small (%d)", mru);
               exit(EXIT_FAILURE);
       }

       len = sizeof(n);
       if (getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, &len) == -1) {
               log_err("Could not read SO_RCVBUF");
               exit(EXIT_FAILURE);
       }
       if (n < 10 * mru) {
               n = 10 * mru;
               if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1)
                       log_info("Could not increase SO_RCVBUF (to %d)", n);
       }

       len = sizeof(mtu);
       if (getsockopt(fd, BTPROTO_L2CAP, SO_L2CAP_OMTU, &mtu, &len) == -1) {
               log_err("Could not get L2CAP OMTU: %m");
               exit(EXIT_FAILURE);
       }
       if (mtu < BNEP_MTU_MIN) {
               log_err("L2CAP OMTU too small (%d)", mtu);
               exit(EXIT_FAILURE);
       }

       len = sizeof(n);
       if (getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, &len) == -1) {
               log_err("Could not get socket send buffer size: %m");
               close(fd);
               return;
       }
       if (n < (mtu * 2)) {
               n = mtu * 2;
               if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &n, sizeof(n)) == -1) {
                       log_err("Could not set socket send buffer size (%d): %m", n);
                       close(fd);
                       return;
               }
       }
       n = mtu;
       if (setsockopt(fd, SOL_SOCKET, SO_SNDLOWAT, &n, sizeof(n)) == -1) {
               log_err("Could not set socket low water mark (%d): %m", n);
               close(fd);
               return;
       }

       chan = channel_alloc();
       if (chan == NULL)
               exit(EXIT_FAILURE);

       chan->send = bnep_send;
       chan->recv = bnep_recv;
       chan->down = client_down;
       chan->mru = mru;
       chan->mtu = mtu;
       b2eaddr(chan->raddr, &remote_bdaddr);
       b2eaddr(chan->laddr, &local_bdaddr);
       chan->state = CHANNEL_WAIT_CONNECT_RSP;
       channel_timeout(chan, 10);
       if (!channel_open(chan, fd))
               exit(EXIT_FAILURE);

       bnep_send_control(chan, BNEP_SETUP_CONNECTION_REQUEST,
           2, service_class, SDP_SERVICE_CLASS_PANU);
}

static void
client_down(channel_t *chan)
{

       log_err("Client connection shut down, exiting");
       exit(EXIT_FAILURE);
}

static void
client_query(void)
{
       uint8_t buf[12];        /* enough for SSP and AIL both */
       sdp_session_t ss;
       sdp_data_t ssp, ail, rsp, rec, value, pdl, seq;
       uintmax_t psm;
       uint16_t attr;
       bool rv;

       ss = sdp_open(&local_bdaddr, &remote_bdaddr);
       if (ss == NULL) {
               log_err("%s: %m", service_type);
               exit(EXIT_FAILURE);
       }

       log_info("Searching for %s service at %s",
           service_type, bt_ntoa(&remote_bdaddr, NULL));

       seq.next = buf;
       seq.end = buf + sizeof(buf);

       /*
        * build ServiceSearchPattern (9 bytes)
        *
        *      uuid16  "service_class"
        *      uuid16  L2CAP
        *      uuid16  BNEP
        */
       ssp.next = seq.next;
       sdp_put_uuid16(&seq, service_class);
       sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP);
       sdp_put_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP);
       ssp.end = seq.next;

       /*
        * build AttributeIDList (3 bytes)
        *
        *      uint16  ProtocolDescriptorList
        */
       ail.next = seq.next;
       sdp_put_uint16(&seq, SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
       ail.end = seq.next;

       rv = sdp_service_search_attribute(ss, &ssp, &ail, &rsp);
       if (!rv) {
               log_err("%s: %m", service_type);
               exit(EXIT_FAILURE);
       }

       /*
        * we expect the response to contain a list of records
        * containing a ProtocolDescriptorList. Find the first
        * one containing L2CAP and BNEP protocols and extract
        * the PSM.
        */
       rv = false;
       while (!rv && sdp_get_seq(&rsp, &rec)) {
               if (!sdp_get_attr(&rec, &attr, &value)
                   || attr != SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST)
                       continue;

               sdp_get_alt(&value, &value);    /* drop any alt header */
               while (!rv && sdp_get_seq(&value, &pdl)) {
                       if (sdp_get_seq(&pdl, &seq)
                           && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_L2CAP)
                           && sdp_get_uint(&seq, &psm)
                           && sdp_get_seq(&pdl, &seq)
                           && sdp_match_uuid16(&seq, SDP_UUID_PROTOCOL_BNEP))
                               rv = true;
               }
       }

       sdp_close(ss);

       if (!rv) {
               log_err("%s query failed", service_type);
               exit(EXIT_FAILURE);
       }

       l2cap_psm = (uint16_t)psm;
       log_info("Found PSM %u for service %s", l2cap_psm, service_type);
}

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