/* $NetBSD: ssr.c,v 1.2 2007/11/09 20:08:41 plunky Exp $ */
/* $DragonFly: src/usr.sbin/sdpd/ssr.c,v 1.1 2008/01/06 21:51:30 hasso Exp $ */

/*
 * ssr.c
 *
 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
 * 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 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 THE AUTHOR 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.
 *
 * $Id: ssr.c,v 1.2 2007/11/30 07:39:37 griffin Exp $
 * $FreeBSD: src/usr.sbin/bluetooth/sdpd/ssr.c,v 1.3 2005/01/05 18:37:37 emax Exp $
 */

#include <sys/queue.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <bluetooth.h>
#include <errno.h>
#include <sdp.h>
#include <string.h>
#include "profile.h"
#include "provider.h"
#include "server.h"
#include "uuid-private.h"

/*
 * Extract ServiceSearchPattern from request to uuid array
 *      return count or 0 if error
 */
int
server_get_service_search_pattern(uint8_t const **buf, uint8_t const *end, uint128_t *uuid)
{
        uint8_t const *req = *buf;
        uint32_t type, ssplen;
        int count;

        if (req + 1 > end)
                return 0;

        SDP_GET8(type, req);

        ssplen = 0;
        switch (type) {
        case SDP_DATA_SEQ8:
                if (req + 1 > end)
                        return 0;

                SDP_GET8(ssplen, req);
                break;

        case SDP_DATA_SEQ16:
                if (req + 2 > end)
                        return 0;

                SDP_GET16(ssplen, req);
                break;

        case SDP_DATA_SEQ32:
                if (req + 4 > end)
                        return 0;

                SDP_GET32(ssplen, req);
                break;

        default:
                return 0;
        }

        if (req + ssplen > end)
                return 0;

        count = 0;
        while (ssplen > 0) {
                if (count == 12)
                        return 0;

                SDP_GET8(type, req);
                ssplen--;

                switch (type) {
                case SDP_DATA_UUID16:
                        if (ssplen < 2)
                                return 0;

                        memcpy(uuid, &uuid_base, sizeof(*uuid));
                        uuid->b[2] = *req++;
                        uuid->b[3] = *req++;
                        ssplen -= 2;
                        break;

                case SDP_DATA_UUID32:
                        if (ssplen < 4)
                                return 0;

                        memcpy(uuid, &uuid_base, sizeof(*uuid));
                        uuid->b[0] = *req++;
                        uuid->b[1] = *req++;
                        uuid->b[2] = *req++;
                        uuid->b[3] = *req++;
                        ssplen -= 4;
                        break;

                case SDP_DATA_UUID128:
                        if (ssplen < 16)
                                return 0;

                        memcpy(uuid, req, 16);
                        req += 16;
                        ssplen -= 16;
                        break;

                default:
                        return 0;
                }

                count++;
                uuid++;
        }

        *buf = req;
        return count;
}

/*
 * Prepare SDP Service Search Response
 */

int32_t
server_prepare_service_search_response(server_p srv, int32_t fd)
{
        uint8_t const   *req = srv->req + sizeof(sdp_pdu_t);
        uint8_t const   *req_end = req + ((sdp_pdu_p)(srv->req))->len;
        uint8_t         *rsp = srv->fdidx[fd].rsp;
        uint8_t const   *rsp_end = rsp + L2CAP_MTU_MAXIMUM;

        provider_t      *provider = NULL;
        int32_t          ucount, rsp_limit, cslen, cs;
        uint128_t        ulist[12];

        /*
         * Minimal SDP Service Search Request
         *
         * seq8 len8            - 2 bytes
         *      uuid16 value16  - 3 bytes ServiceSearchPattern
         * value16              - 2 bytes MaximumServiceRecordCount
         * value8               - 1 byte  ContinuationState
         */

        /* Get ServiceSearchPattern into uuid array */
        ucount = server_get_service_search_pattern(&req, req_end, ulist);
        if (ucount < 1 || ucount > 12)
                return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);

        /* Get MaximumServiceRecordCount */
        if (req + 2 > req_end)
                return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);

        SDP_GET16(rsp_limit, req);
        if (rsp_limit <= 0)
                return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);

        /* Get ContinuationState */
        if (req + 1 > req_end)
                return (SDP_ERROR_CODE_INVALID_REQUEST_SYNTAX);

        SDP_GET8(cslen, req);
        if (cslen == 2 && req + 2 == req_end)
                SDP_GET16(cs, req);
        else if (cslen == 0 && req == req_end)
                cs = 0;
        else
                return (SDP_ERROR_CODE_INVALID_CONTINUATION_STATE);

        /* Process the request. First, check continuation state */
        if (srv->fdidx[fd].rsp_cs != cs)
                return (SDP_ERROR_CODE_INVALID_CONTINUATION_STATE);
        if (srv->fdidx[fd].rsp_size > 0)
                return (0);

        /*
         * Service Search Response format
         *
         * value16      - 2 bytes TotalServiceRecordCount (not incl.)
         * value16      - 2 bytes CurrentServiceRecordCount (not incl.)
         * value32      - 4 bytes handle
         * [ value32 ]
         */

        /* Look for the record handles and add to the rsp buffer */
        for (provider = provider_get_first();
             provider != NULL;
             provider = provider_get_next(provider)) {
                if (!provider_match_bdaddr(provider, &srv->req_sa.bt_bdaddr))
                        continue;

                if (!provider_match_uuid(provider, ulist, ucount))
                        continue;

                if (rsp + 4 > rsp_end)
                        break;

                SDP_PUT32(provider->handle, rsp);
        }

        /* Set reply size (not counting PDU header and continuation state) */
        srv->fdidx[fd].rsp_limit = srv->fdidx[fd].omtu - sizeof(sdp_pdu_t) - 4;
        srv->fdidx[fd].rsp_size = rsp - srv->fdidx[fd].rsp;
        srv->fdidx[fd].rsp_cs = 0;

        return (0);
}

/*
 * Send SDP Service Search Response
 */

int32_t
server_send_service_search_response(server_p srv, int32_t fd)
{
        uint8_t         *rsp = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_cs;
        uint8_t         *rsp_end = srv->fdidx[fd].rsp + srv->fdidx[fd].rsp_size;

        struct iovec    iov[4];
        sdp_pdu_t       pdu;
        uint16_t        rcounts[2];
        uint8_t         cs[3];
        int32_t         size;

        /* First update continuation state (assume we will send all data) */
        size = rsp_end - rsp;
        srv->fdidx[fd].rsp_cs += size;

        if (size + 1 > srv->fdidx[fd].rsp_limit) {
                /*
                 * We need to split out response. Add 3 more bytes for the
                 * continuation state and move rsp_end and rsp_cs backwards.
                 */

                while ((rsp_end - rsp) + 3 > srv->fdidx[fd].rsp_limit) {
                        rsp_end -= 4;
                        srv->fdidx[fd].rsp_cs -= 4;
                }

                cs[0] = 2;
                cs[1] = srv->fdidx[fd].rsp_cs >> 8;
                cs[2] = srv->fdidx[fd].rsp_cs & 0xff;
        } else
                cs[0] = 0;

        assert(rsp_end >= rsp);

        rcounts[0] = srv->fdidx[fd].rsp_size / 4; /* TotalServiceRecordCount */
        rcounts[1] = (rsp_end - rsp) / 4; /* CurrentServiceRecordCount */

        pdu.pid = SDP_PDU_SERVICE_SEARCH_RESPONSE;
        pdu.tid = ((sdp_pdu_p)(srv->req))->tid;
        pdu.len = htons(sizeof(rcounts) + rcounts[1] * 4 + 1 + cs[0]);

        rcounts[0] = htons(rcounts[0]);
        rcounts[1] = htons(rcounts[1]);

        iov[0].iov_base = &pdu;
        iov[0].iov_len = sizeof(pdu);

        iov[1].iov_base = rcounts;
        iov[1].iov_len = sizeof(rcounts);

        iov[2].iov_base = rsp;
        iov[2].iov_len = rsp_end - rsp;

        iov[3].iov_base = cs;
        iov[3].iov_len = 1 + cs[0];

        do {
                size = writev(fd, (struct iovec const *) &iov, sizeof(iov)/sizeof(iov[0]));
        } while (size < 0 && errno == EINTR);

        /* Check if we have sent (or failed to sent) last response chunk */
        if (srv->fdidx[fd].rsp_cs == srv->fdidx[fd].rsp_size) {
                srv->fdidx[fd].rsp_cs = 0;
                srv->fdidx[fd].rsp_size = 0;
                srv->fdidx[fd].rsp_limit = 0;
        }

        return ((size < 0)? errno : 0);
}