slpfind.c

这是有名的＜＜嵌入式系统TCP/IP应用层协议＞＞,M.Tim Jones 著

/*
 *  Embedded SLP Find Services Implementation
 *
 *  ./software/ch10/emslp/slpfind.c
 *
 *  [e-mail]
 *
 */

#include <stdio.h>
#include <string.h>
#include "slpapi.h"
#include "slppriv.h"

/*
 *  slpRequestService()
 *
 *  Perform an SLP find services command.
 *
 */

int slpRequestService( slpHandleType *handle,
                       slpParsedServiceReplyType *slpPReply,
                       const char *serviceType,
                       const char *predicates
               )
{
  slpMsgType slpMsg;
  int ret, i;

  if ((handle == NULL) || (slpPReply == NULL)) return -1;

  bzero( (void *)slpPReply, sizeof(slpParsedServiceReplyType) );

  slpCreateHeader(&slpMsg, SRV_RQST, "en", FRESH);

  /* Emit the PRLIST */
  emitShort(&slpMsg, 0);

  /* Next, the service string */
  emitShort(&slpMsg, strlen(serviceType));
  emitString(&slpMsg, serviceType);

  /* Emit the scope string */
  emitShort(&slpMsg, 7);
  emitString(&slpMsg, "default");

  /* Emit the predicates List */
  emitShort(&slpMsg, strlen(predicates));
  emitString(&slpMsg, predicates);

  /* Emit null <SLP SPI> */
  emitShort(&slpMsg, 0);

  setSlpHeaderLength( &slpMsg );

  slpPrintMessage( &slpMsg );

  ret = slpSendMessage( handle, &slpMsg );

  for (i = 0 ; i < 5 ; i++) {

    ret = slpReceiveMessage( handle, &slpMsg, 1 );

    if (ret == 0) {
      slpPrintMessage( &slpMsg );

      ret = slpParseServiceReply( &slpMsg, slpPReply );

#ifdef SLP_DEBUG
      printf( "slpReply resulted in %d elements\n", slpPReply->urlCount );

      if (1) {
        int j;
        for (j = 0 ; j < slpPReply->urlCount ; j++) {
          printf("URL Record %d\n", j);
          printf("  Lifetime : %04x\n", slpPReply->urls[j].lifetime);
          printf("  URL      : %s\n", slpPReply->urls[j].url);
        }
        printf("\n");
      }
#endif

    }

  }

  return slpPReply->urlCount;
}


/*
 *  slpRequestAllServices()
 *
 *  Perform an SLP find service-types command.
 *
 */

int slpRequestAllServices( slpHandleType *handle,
                           slpParsedServiceTypeReplyType *slpPReply
                         )
{
  slpMsgType slpMsg;
  int ret, i;

  if ((handle == NULL) || (slpPReply == NULL)) return -1;

  bzero( (void *)slpPReply, sizeof(slpParsedServiceTypeReplyType) );

  slpCreateHeader(&slpMsg, SRV_TYPE_RQST, "en", FRESH);

  /* Emit the PRLIST */
  emitShort(&slpMsg, 0);

  /* Emit the Naming Authority */
  emitShort(&slpMsg, 0xffff);

  /* Emit the scope string */
  emitShort(&slpMsg, 7);
  emitString(&slpMsg, "default");

  setSlpHeaderLength( &slpMsg );

  slpPrintMessage( &slpMsg );

  ret = slpSendMessage( handle, &slpMsg );

  for (i = 0 ; i < 5 ; i++) {

    ret = slpReceiveMessage( handle, &slpMsg, 1 );

    if (ret == 0) {
      slpPrintMessage( &slpMsg );

      ret = slpParseServiceTypesReply( &slpMsg, slpPReply );

#ifdef SLP_DEBUG
      printf( "slpReply resulted in %d elements\n", slpPReply->srvCount );
#endif

    }

  }

  return slpPReply->srvCount;
}

/*
 *  Copyright (c) 2002 Charles River Media.  All rights reserved.
 * 
 *  Redistribution and use in source and binary forms, with or 
 *  without modification, is hereby granted without fee 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 Charles River Media nor the names of 
 *        its contributors may be used to endorse or promote products 
 *        derived from this software without specific prior 
 *        written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY CHARLES RIVER MEDIA AND CONTRIBUTERS 
 * 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS 
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CHARLES
 * RIVER MEDIA OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARAY, 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.
 */