libslp_findattrs.c

SLP协议在linux下的实现。此版本为1.2.1版。官方网站为www.openslp.org

					  cookie);
	    break;
	}
	else
	#endif
	sock = NetworkConnectToDA(handle,
                                  handle->params.findattrs.scopelist,
                                  handle->params.findattrs.scopelistlen,
                                  &peeraddr);
        if(sock == -1)
        {
            /* use multicast as a last resort */
            
            #ifndef MI_NOT_SUPPORTED
            result = NetworkMcastRqstRply(handle,
                                          buf,
                                          SLP_FUNCT_ATTRRQST,
                                          bufsize,
                                          ProcessAttrRplyCallback,
                                          NULL);
            #else	
	    result = NetworkMcastRqstRply(handle->langtag,
                                          buf,
                                          SLP_FUNCT_ATTRRQST,
                                          bufsize,
                                          ProcessAttrRplyCallback,
                                          handle);
            #endif /* MI_NOT_SUPPORTED */			
            break;
        }

        result = NetworkRqstRply(sock,
                                 &peeraddr,
                                 handle->langtag,
                                 0,
                                 buf,
                                 SLP_FUNCT_ATTRRQST,
                                 bufsize,
                                 ProcessAttrRplyCallback,
                                 handle);
        if(result)
        {
            NetworkDisconnectDA(handle);
        }

    }while(result == SLP_NETWORK_ERROR);


    FINISHED:
    if(buf) xfree(buf);
#ifdef ENABLE_SLPv2_SECURITY
    if(spistr) xfree(spistr);
#endif

    return result;
}

#ifdef ENABLE_ASYNC_API
/*-------------------------------------------------------------------------*/ 
SLPError AsyncProcessAttrRqst(PSLPHandleInfo handle)
/*-------------------------------------------------------------------------*/
{
    SLPError result = ProcessAttrRqst(handle);
    xfree((void*)handle->params.findattrs.url);
    xfree((void*)handle->params.findattrs.scopelist);
    xfree((void*)handle->params.findattrs.taglist);
    handle->inUse = SLP_FALSE;
    return result;
}
#endif


/*=========================================================================*/
SLPError SLPAPI SLPFindAttrs(SLPHandle   hSLP,
                      const char *pcURLOrServiceType,
                      const char *pcScopeList,
                      const char *pcAttrIds,
                      SLPAttrCallback callback,
                      void *pvCookie)
/*                                                                         */
/* This function returns service attributes matching the attribute ids     */
/* for the indicated service URL or service type.  If pcURLOrServiceType   */
/* is a service URL, the attribute information returned is for that        */
/* particular advertisement in the language locale of the SLPHandle.       */
/*                                                                         */
/* If pcURLOrServiceType is a service type name (including naming          */
/* authority if any), then the attributes for all advertisements of that   */
/* service type are returned regardless of the language of registration.   */
/* Results are returned through the callback.                              */
/*                                                                         */
/* The result is filtered with an SLP attribute request filter string      */
/* parameter, the syntax of which is described in RFC 2608. If the filter  */
/* string is the empty string, i.e.  "", all attributes are returned.      */
/*                                                                         */
/* hSLP                 The language specific SLPHandle on which to search */
/*                      for attributes.                                    */
/*                                                                         */
/* pcURLOrServiceType   The service URL or service type.  See RFC 2608 for */
/*                      URL and service type syntax.  May not be the empty */
/*                      string.                                            */
/*                                                                         */
/* pcScopeList          A pointer to a char containing a comma separated   */
/*                      list of scope names. Pass in NULL or the empty     */
/*                      string "" to find services in all the scopes the   */
/*                      local host is configured query.                    */
/*                                                                         */
/* pcAttrIds            A comma separated list of attribute ids to return. */
/*                      Use NULL or the empty string, "", to indicate all  */
/*                      values. Wildcards are not currently supported      */
/*                                                                         */
/* callback             A callback function through which the results of   */
/*                      the operation are reported.                        */
/*                                                                         */
/* pvCookie             Memory passed to the callback code from the client.*/  
/*                      May be NULL.                                       */
/*                                                                         */
/* Returns:             If an error occurs in starting the operation, one  */
/*                      of the SLPError codes is returned.                 */
/*=========================================================================*/
{
    PSLPHandleInfo      handle;
    SLPError            result;

    /*------------------------------*/
    /* check for invalid parameters */
    /*------------------------------*/
    if(hSLP == 0 ||
       *(unsigned int*)hSLP != SLP_HANDLE_SIG ||
       pcURLOrServiceType == 0 ||
       *pcURLOrServiceType == 0 || 
       callback == 0)
    {
        return SLP_PARAMETER_BAD;
    }

    /*-----------------------------------------*/
    /* cast the SLPHandle into a SLPHandleInfo */
    /*-----------------------------------------*/
    handle = (PSLPHandleInfo)hSLP; 

    /*-----------------------------------------*/
    /* Check to see if the handle is in use    */
    /*-----------------------------------------*/
    if(handle->inUse == SLP_TRUE)
    {
        return SLP_HANDLE_IN_USE;
    }
    handle->inUse = SLP_TRUE;


    /*-------------------------------------------*/
    /* Set the handle up to reference parameters */
    /*-------------------------------------------*/
    handle->params.findattrs.urllen   = strlen(pcURLOrServiceType);
    handle->params.findattrs.url      = pcURLOrServiceType;
    if(pcScopeList && *pcScopeList)
    {
        handle->params.findattrs.scopelistlen = strlen(pcScopeList);
        handle->params.findattrs.scopelist    = pcScopeList;
    }
    else
    {
        handle->params.findattrs.scopelist    = SLPGetProperty("net.slp.useScopes");
        handle->params.findattrs.scopelistlen = strlen(handle->params.findattrs.scopelist);
    }
    if(pcAttrIds && *pcAttrIds)
    {
        handle->params.findattrs.taglistlen = strlen(pcAttrIds);
        handle->params.findattrs.taglist    = pcAttrIds;
    }
    else
    {
        handle->params.findattrs.taglistlen = 0;
        handle->params.findattrs.taglist    = (char*)&handle->params.findattrs.taglistlen;
    }
    handle->params.findattrs.callback   = callback;
    handle->params.findattrs.cookie     = pvCookie; 


    /*----------------------------------------------*/
    /* Check to see if we should be async or sync   */
    /*----------------------------------------------*/
#ifdef ENABLE_ASYNC_API
    if(handle->isAsync)
    {
        /* COPY all the referenced parameters */
        handle->params.findattrs.url = xstrdup(handle->params.findattrs.url);
        handle->params.findattrs.scopelist = xstrdup(handle->params.findattrs.scopelist);
        handle->params.findattrs.taglist = xstrdup(handle->params.findattrs.taglist);

        /* make sure strdups did not fail */
        if(handle->params.findattrs.url &&
           handle->params.findattrs.scopelist &&
           handle->params.findattrs.taglist)
        {
            result = ThreadCreate((ThreadStartProc)AsyncProcessAttrRqst,handle);
        }
        else
        {
            result = SLP_MEMORY_ALLOC_FAILED;    
        }

        if(result)
        {
            if(handle->params.findattrs.url) xfree((void*)handle->params.findattrs.url);
            if(handle->params.findattrs.scopelist) xfree((void*)handle->params.findattrs.scopelist);
            if(handle->params.findattrs.taglist) xfree((void*)handle->params.findattrs.taglist);
            handle->inUse = SLP_FALSE;
        }
    }
    else
#endif /* ifdef ENABLE_ASYNC_API */
    {
        /* Leave all parameters REFERENCED */

        result = ProcessAttrRqst(handle);

        handle->inUse = SLP_FALSE;
    }

    return result;
}