v3_comm.c

来自「wm PNE 3.3 source code, running at more 」· C语言 代码 · 共 545 行 · 第 1/2 页

/* v3_comm.c - v3_comm.c routines */

/*
 *  Copyright 2001-2005 Wind River Systems, Inc.
 *  All rights reserved.  Provided under license only.
 *  Distribution or other use of this software is only
 *  permitted pursuant to the terms of a license agreement
 *  from Wind River Systems (and is otherwise prohibited).
 *  Refer to that license agreement for terms of use.
 */

/*
 * $Log: v3_comm.c,v $
 * Revision 1.2  2001/11/06 21:20:30  josh
 * revised new path hacking
 *
 * Revision 1.1.1.1  2001/11/05 17:47:44  tneale
 * Tornado shuffle
 *
 * Revision 1.1.2.2  2001/08/24 14:33:34  josh
 * use the envoy_err_t error codes where applicable
 *
 * Revision 1.1.2.1  2001/07/16 18:02:14  josh
 * a first-round commit adding infrastructure support
 * for the SNMPv3 Coexistence RFC (2576)
 *
 *
 */

/* [clearcase]
modification history
-------------------
01e,12may05,job  fix apigen comments
01d,18apr05,job  update copyright notices
01c,04mar05,job  apigen update
01b,16feb05,job  apigen for documented APIs
01a,24nov03,job  update copyright information
*/

/*
DESCRIPTION
This library contains v3_comm.c routines.

INCLUDE FILES: snmp.h, v3_comm.h
*/

#include <wrn/wm/snmp/engine/asn1.h>
#include <wrn/wm/snmp/engine/snmp.h>
#include <wrn/wm/snmp/engine/buffer.h>
#include <wrn/wm/snmp/engine/objectid.h>
#include <wrn/wm/snmp/engine/v3_eng.h>
#include <wrn/wm/snmp/engine/v3_comm.h>
#include <wrn/wm/snmp/engine/snmpdefs.h>

/****************************************************************************
\NOMANUAL
NAME:    community list

PURPOSE: This is the list of community objects that we know
         about.  It is ordered by community index, the same as the
         indexing for the mib.
****************************************************************************/


/****************************************************************************
NAME: community_find_before

PURPOSE: Search through the list until we find the community
         structure we are looking for.  We return a pointer to the
         pointer that would point to the requested community if it
         were to exist.  The calling routine is responsible for
         determining if the requested community exists.  This
         construction allows us to reuse this code for all of the find
         routines (lookup and install).

PARAMETERS: bits8_t   * pointer to index name buffer
	    ALENGTH_T   number of bytes in index name

RETURNS: SNMP_COMMUNITY_T ** pointer to pointer that would point to the 
			     community if it were to exist.
****************************************************************************/

static SNMP_COMMUNITY_T **
  community_find_before(bits8_t   *comm_index,
                        ALENGTH_T  comm_index_len)
{
SNMP_COMMUNITY_T   **community;
ALENGTH_T            min_index_len;
int                  compare;

for(community = &root_community; 
    *community; 
    community = &(*community)->next) {
    min_index_len = min(comm_index_len, 
                        EBufferUsed(&((*community)->comm_index)));
    if ((compare = MEMCMP(EBufferStart(&((*community)->comm_index)), 
			  comm_index,
			  min_index_len)) >= 0) 
        if (compare || (min_index_len == comm_index_len))
	    break;
    }

return(community);
}

/*******************************************************************************
*
* SNMP_Community_Lookup -  find a community matching the specified index.
* SYNOPSIS
*
* \cs
* SNMP_COMMUNITY_T *  SNMP_Community_Lookup 
*     (
*     bits8_t       *  comm_index,
*     ALENGTH_T         comm_index_len
*     )
* \ce
*
* DESCRIPTION
*
* This routine finds the community object entry that matches the specified 
* <comm_index>.
*
* PARAMETERS
* \is
* \i <*comm_index>
* Point to the community index, which corresponds to the MIB object 
* <snmpCommunityIndex>.
* \i <comm_index_len>
* Specify the length in bytes of the allocated <comm_index> buffer.
* \ie
*
* RETURNS: If successful, this routine returns a pointer to the community 
* object with the specified name. Otherwise, the object doesn\抰 exist and this 
* routine returns NULL.
*
* ERRNO: N/A
*
* SEE ALSO: SNMP_Community_Create(), SNMP_Community_Deinstall(), 
* SNMP_Community_Destroy(), SNMP_Community_Index(), SNMP_Community_Install(), 
* SNMP_Community_Next_Community()
*/
SNMP_COMMUNITY_T *
  SNMP_Community_Lookup(bits8_t   *comm_index,
                        ALENGTH_T  comm_index_len)
{
SNMP_COMMUNITY_T **community;

community = community_find_before(comm_index, comm_index_len);
if (*community && 
    (comm_index_len == EBufferUsed(&((*community)->comm_index))) &&
    (MEMCMP(EBufferStart(&((*community)->comm_index)), 
	    comm_index,
	    comm_index_len) == 0))
    return(*community);
return(0);
}

/****************************************************************************
\NOMANUAL
NAME: SNMP_Community_Next

PURPOSE: Find the next community after the named one.

	the indexing information is of the form:
	<comm_index>
	but as this is a next we might not have all of it...

PARAMETERS: 
	 int	 tcount number of subids
	 OIDC_T *tlist  list of subids
	 
RETURNS: SNMP_COMMUNITY_T * pointer to community or 0 if none found
****************************************************************************/
SNMP_COMMUNITY_T *
  SNMP_Community_Next(int     tcount,
                      OIDC_T *tlist)
{
SNMP_COMMUNITY_T *community;
bits8_t *comm_index;
OIDC_T *temp_oid;
ALENGTH_T min_index_len = 0, len;

if (tcount == 0)
    return(root_community);

for (community = root_community;
     community;
     community = community->next) {
    comm_index = EBufferStart(&(community)->comm_index);
    min_index_len = min(tcount, EBufferUsed(&(community->comm_index)));
    temp_oid = tlist;
     for (len = min_index_len; 
	  len && (*comm_index == *temp_oid);
	  len--, comm_index++, temp_oid++)
         ;
     if (len) {
         if (*comm_index > *temp_oid)
	     return(community);
         }
     else {
         if (EBufferUsed(&(community->comm_index)) > tcount)
	     return(community);
         }
     }
return(0);
}

/*******************************************************************************
*
* SNMP_Community_Next_Community -  find the next community object
* SYNOPSIS
*
* \cs
* SNMP_COMMUNITY_T  *  SNMP_Community_Next_Community 
*     (
*     SNMP_COMMUNITY_T  *  community
*     )
* \ce
*
* DESCRIPTION
*
* This routine finds the next community object entry in the community table 
* after the specified community object. Use this routine to step through the 
* community table to find all installed community objects.
*
* PARAMETERS
* \is
* \i <*community>
* Point to a community object in the community table. To return a pointer to 
* the first community object in the table, specify this parameter as NULL.
* \ie
*
* RETURNS: If successful, this routine returns a pointer to the community 
* object that comes next in the list after the specified community object. If 
* there is no successor, or the specified community object is not installed, 
* this routine returns NULL.
*
* ERRNO: N/A
*
* SEE ALSO: SNMP_Community_Create(), SNMP_Community_Deinstall(), 
* SNMP_Community_Destroy(), SNMP_Community_Index(), SNMP_Community_Install(), 
* SNMP_Community_Lookup()
*/
SNMP_COMMUNITY_T *
  SNMP_Community_Next_Community (SNMP_COMMUNITY_T *community)
{
if (community)
    return(community->next);
return(root_community);
}

/*******************************************************************************
*
* SNMP_Community_Destroy - destroy the community object and free any associated resources
* SYNOPSIS
*
* \cs
* void SNMP_Community_Destroy
*     (
*     SNMP_COMMUNITY_T *community
*     )
* \ce
*
* DESCRIPTION
*
* This routine deallocates all memory associated with the specified community 
* object, and then deallocates the object itself.
*
* \&NOTE: If the specified object has been installed, call 
* SNMP_Community_Deinstall() before calling this routine.
*
* PARAMETERS