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

/***************************************************************************/
/*                                                                         */
/* Project:     OpenSLP - OpenSource implementation of Service Location    */
/*              Protocol Version 2                                         */
/*                                                                         */
/* File:        slplib_findattrs.c                                         */
/*                                                                         */
/* Abstract:    Implementation for SLPFindAttrs() call.                    */
/*                                                                         */
/*-------------------------------------------------------------------------*/
/*                                                                         */
/*     Please submit patches to http://www.openslp.org                     */
/*                                                                         */
/*-------------------------------------------------------------------------*/
/*                                                                         */
/* Copyright (C) 2000 Caldera Systems, Inc                                 */
/* All rights reserved.                                                    */
/*                                                                         */
/* Redistribution and use in source and binary forms, with or without      */
/* modification, are permitted provided that the following conditions are  */
/* met:                                                                    */ 
/*                                                                         */
/*      Redistributions of source code must retain the above copyright     */
/*      notice, this list of conditions and the following disclaimer.      */
/*                                                                         */
/*      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.                                                      */
/*                                                                         */
/*      Neither the name of Caldera Systems 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 THE COPYRIGHT HOLDERS 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 CALDERA      */
/* SYSTEMS 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.    */
/*                                                                         */
/***************************************************************************/


#include "slp.h"
#include "libslp.h"


/* TODO: do we need to add anything for collation here? */

/*-------------------------------------------------------------------------*/
SLPBoolean ProcessAttrRplyCallback(SLPError errorcode, 
                                   struct sockaddr_in* peerinfo,
                                   SLPBuffer replybuf,
                                   void* cookie)
/*-------------------------------------------------------------------------*/
{
    SLPMessage      replymsg;
    SLPAttrRply*    attrrply;
    PSLPHandleInfo  handle      = (PSLPHandleInfo) cookie;
    SLPBoolean      result      = SLP_TRUE;

#ifdef ENABLE_SLPv2_SECURITY 
    int             securityenabled;
    securityenabled = SLPPropertyAsBoolean(SLPGetProperty("net.slp.securityEnabled"));
#endif

    /*-------------------------------------------*/
    /* Check the errorcode and bail if it is set */
    /*-------------------------------------------*/
    if(errorcode)
    {
        handle->params.findattrs.callback((SLPHandle)handle,
                                          0,
                                          errorcode,
                                          handle->params.findattrs.cookie);
        return SLP_FALSE;
    }

    /*--------------------*/
    /* Parse the replybuf */
    /*--------------------*/
    replymsg = SLPMessageAlloc();
    if(replymsg)
    {
        if(SLPMessageParseBuffer(peerinfo,replybuf,replymsg) == 0 &&
           replymsg->header.functionid == SLP_FUNCT_ATTRRPLY &&
           replymsg->body.attrrply.errorcode == 0)
        {
            attrrply = &(replymsg->body.attrrply);
            
            if(attrrply->attrlistlen)
            {
     
#ifdef ENABLE_SLPv2_SECURITY
                /*-------------------------------*/
                /* Validate the authblocks       */
                /*-------------------------------*/
                if(SLPPropertyAsBoolean(SLPGetProperty("net.slp.securityEnabled")) &&
                   SLPAuthVerifyString(handle->hspi,
                                       1,
                                       attrrply->attrlistlen,
                                       attrrply->attrlist,
                                       attrrply->authcount,
                                       attrrply->autharray))
                {
                    /* Could not verify the attr auth block */
                    SLPMessageFree(replymsg);
                    return result;
                }
#endif
                /*---------------------------------------*/
                /* Send the attribute list to the caller */
                /*---------------------------------------*/
                /* TRICKY: null terminate the attrlist by setting the authcount to 0 */
                ((char*)(attrrply->attrlist))[attrrply->attrlistlen] = 0;
                
                /* Call the callback function */
                result = handle->params.findattrs.callback((SLPHandle)handle,
                                                           attrrply->attrlist,
                                                           attrrply->errorcode * -1,
                                                           handle->params.findattrs.cookie);
            }
        }
        
        SLPMessageFree(replymsg);
    }
    
    return result;
}


/*-------------------------------------------------------------------------*/
SLPError ProcessAttrRqst(PSLPHandleInfo handle)
/*-------------------------------------------------------------------------*/
{
    int                 sock;
    struct sockaddr_in  peeraddr;
    int                 bufsize     = 0;
    char*               buf         = 0;
    char*               curpos      = 0;
    SLPError            result      = 0;

#ifdef ENABLE_SLPv2_SECURITY
    int                 spistrlen   = 0;
    char*               spistr      = 0;

    if(SLPPropertyAsBoolean(SLPGetProperty("net.slp.securityEnabled")))
    {
        SLPSpiGetDefaultSPI(handle->hspi,
                            SLPSPI_KEY_TYPE_PUBLIC,
                            &spistrlen,
                            &spistr);
    }
#endif

    /*-------------------------------------------------------------------*/
    /* determine the size of the fixed portion of the ATTRRQST           */
    /*-------------------------------------------------------------------*/
    bufsize  = handle->params.findattrs.urllen + 2;       /*  2 bytes for len field */
    bufsize += handle->params.findattrs.scopelistlen + 2; /*  2 bytes for len field */
    bufsize += handle->params.findattrs.taglistlen + 2;   /*  2 bytes for len field */
    bufsize += 2;    /*  2 bytes for spistr len*/
#ifdef ENABLE_SLPv2_SECURITY
    bufsize += spistrlen;
#endif

    buf = curpos = (char*)xmalloc(bufsize);
    if(buf == 0)
    {
        result = SLP_MEMORY_ALLOC_FAILED;
        goto FINISHED;
    }

    /*------------------------------------------------------------*/
    /* Build a buffer containing the fixed portion of the ATTRRQST*/
    /*------------------------------------------------------------*/
    /* url */
    ToUINT16(curpos,handle->params.findattrs.urllen);
    curpos = curpos + 2;
    memcpy(curpos,
           handle->params.findattrs.url,
           handle->params.findattrs.urllen);
    curpos = curpos + handle->params.findattrs.urllen;
    /* scope list */
    ToUINT16(curpos,handle->params.findattrs.scopelistlen);
    curpos = curpos + 2;
    memcpy(curpos,
           handle->params.findattrs.scopelist,
           handle->params.findattrs.scopelistlen);
    curpos = curpos + handle->params.findattrs.scopelistlen;
    /* taglist  */
    ToUINT16(curpos,handle->params.findattrs.taglistlen);
    curpos = curpos + 2;
    memcpy(curpos,
           handle->params.findattrs.taglist,
           handle->params.findattrs.taglistlen);
    curpos = curpos + handle->params.findattrs.taglistlen;
#ifdef ENABLE_SLPv2_SECURITY
    ToUINT16(curpos,spistrlen);
    curpos = curpos + 2;
    memcpy(curpos,spistr,spistrlen);
    curpos = curpos + spistrlen;
#else
    ToUINT16(curpos,0);
#endif


    /*--------------------------*/
    /* Call the RqstRply engine */
    /*--------------------------*/
    do
    {

        #ifndef UNICAST_NOT_SUPPORTED
	if ( handle->dounicast == 1 ) 
	{
	    void *cookie = (PSLPHandleInfo) handle;
	    result = NetworkUcastRqstRply(handle,
                                          buf,
                                          SLP_FUNCT_ATTRRQST,
					  bufsize,
                                          ProcessAttrRplyCallback,