slpreg.c

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

/*
 *  Embedded SLP Registration Functions
 *
 *  ./software/ch10/emslp/slpreg.c
 *
 *  [e-mail]
 *
 */

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

/*
 *  slpRegisterService()
 *
 *  Perform an SLP service registration.
 *
 */

int slpRegisterService( slpHandleType *handle,
                        const char *serviceURL,
                        const char *serviceType,
                        const char *attributes,
                        uint16_t   lifetime
               )
{
  slpMsgType slpMsg;
  int ret, i;

  if ((handle == NULL) || (serviceURL == NULL) ||
      (serviceType == NULL) || (attributes == NULL)) return -1;

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

  /* First, emit the <URL-Entry> */
  emitByte(&slpMsg, 0);	                          /* Reserved Field */
  emitShort(&slpMsg, lifetime);                   /* Lifetime       */
  emitShort(&slpMsg, strlen(serviceURL));         /* URL Length     */
  emitString(&slpMsg, serviceURL);                /* URL            */
  emitByte(&slpMsg, 0);                           /* # of URL Auths */

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

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

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

  /* Emit null AttrAuths */
  emitByte(&slpMsg, 0);

  setSlpHeaderLength( &slpMsg );

  slpPrintMessage( &slpMsg );

  ret = slpSendMessage( handle, &slpMsg );

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

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

    if ((ret == 0) && (slpMsg.buffer[1] == SRV_ACK)) {
      slpPrintMessage( &slpMsg );
      ret = 0;
      break;
    }

  }

  return 0;
}


int slpDeRegisterService( slpHandleType *handle,
                          const char *serviceURL
                        )
{
  slpMsgType slpMsg;
  int ret, i;

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

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

  /* First, emit the scope */
  emitShort(&slpMsg, 7);
  emitString(&slpMsg, "default");

  /* Next, emit the <URL-Entry> */
  emitByte(&slpMsg, 0);	                          /* Reserved Field */
  emitShort(&slpMsg, SLP_LIFETIME);               /* Lifetime       */
  emitShort(&slpMsg, strlen(serviceURL));         /* URL Length     */
  emitString(&slpMsg, serviceURL);                /* URL            */
  emitByte(&slpMsg, 0);                           /* # of URL Auths */

  /* Next, the null tag list (deregister in all languages) */
  emitShort(&slpMsg, 0);

  /* Emit null AttrAuths */
  emitByte(&slpMsg, 0);

  setSlpHeaderLength( &slpMsg );

  slpPrintMessage( &slpMsg );

  ret = slpSendMessage( handle, &slpMsg );

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

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

    if (slpMsg.buffer[2] == SRV_REPLY) {
      ret = 0;
      break;
    }

  }

  return 0;
}

/*
 *  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.
 */