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Added minimalistic SNMP GET functionality.
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christiaans
224
src/core/snmp/mib_structs.c
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224
src/core/snmp/mib_structs.c
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/**
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* @file
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* [EXPERIMENTAL] Generic MIB tree access/construction functions.
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*/
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/*
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* Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Christiaan Simons <christiaan.simons@axon.tv>
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*/
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#include "lwip/opt.h"
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#include "lwip/snmp_structs.h"
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#if LWIP_SNMP
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/**
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* Searches tree for the supplied (scalar?) object identifier.
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*
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* @param node points to the root of the tree ('.internet')
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* @param ident_len the length of the supplied object identifier
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* @param ident points to the array of sub identifiers
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* @param object_def points to the object definition to return
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* @return pointer to the requested parent (!) node if success, NULL otherwise
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*/
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struct mib_node *
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snmp_search_tree(struct mib_node *node, u8_t ident_len, s32_t *ident, struct obj_def *object_def)
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{
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u8_t node_type;
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("node==%p *ident==%"S32_F,(void*)node,*ident));
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while (node != NULL)
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{
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node_type = node->node_type;
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if ((node_type == MIB_NODE_AR) || (node_type == MIB_NODE_RA))
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{
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struct mib_array_node *an;
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u16_t i;
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/* array node (internal ROM or RAM, fixed length) */
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an = (struct mib_array_node *)node;
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i = 0;
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while ((i < an->maxlength) && (an->objid[i] != *ident))
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{
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i++;
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}
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if (i < an->maxlength)
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{
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if (ident_len > 0)
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{
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/* found it, if available proceed to child, otherwise inspect leaf */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("an->objid[%"U16_F"]==%"S32_F" *ident==%"S32_F,i,an->objid[i],*ident));
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if (an->nptr[i] == NULL)
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{
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/* a scalar leaf OR table,
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inspect remaining instance number / table index */
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/* retrieve object definition with get_object_def()
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is it scalar, or a valid table item, or non-existent? */
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an->get_object_def(ident_len, ident, object_def);
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if (object_def->instance != MIB_OBJECT_NONE)
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{
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/** @todo return something more usefull ?? */
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return (struct mib_node*)an;
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}
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else
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{
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/* search failed, object id points to unknown object (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed, object not in this MIB"));
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return NULL;
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}
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}
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else
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{
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/* follow next child pointer */
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ident++;
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ident_len--;
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node = an->nptr[i];
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}
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}
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else
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{
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/* search failed, short object identifier (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed, short object identifier"));
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return NULL;
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}
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}
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else
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{
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/* search failed, identifier mismatch (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed *ident==%"S32_F,*ident));
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return NULL;
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}
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}
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else if(node_type == MIB_NODE_LR)
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{
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struct mib_list_rootnode *lrn;
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struct mib_list_node *ln;
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/* list root node (internal 'RAM', variable length) */
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lrn = (struct mib_list_rootnode *)node;
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ln = lrn->head;
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/* iterate over list, head to tail */
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while ((ln != NULL) && (ln->objid != *ident))
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{
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ln = ln->next;
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}
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if (ln != NULL)
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{
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if (ident_len > 0)
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{
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/* found it, proceed to child */;
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("ln->objid==%"S32_F" *ident==%"S32_F,ln->objid,*ident));
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if (ln->nptr == NULL)
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{
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lrn->get_object_def(ident_len, ident, object_def);
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if (object_def->instance != MIB_OBJECT_NONE)
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{
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/** @todo return something more usefull ?? */
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return (struct mib_node*)lrn;
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}
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else
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{
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/* search failed, object id points to unknown object (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed, object not in this MIB"));
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return NULL;
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}
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}
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else
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{
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/* follow next child pointer */
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ident_len--;
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ident++;
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node = ln->nptr;
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}
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}
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else
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{
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/* search failed, short object identifier (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed, short object identifier"));
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return NULL;
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}
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}
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else
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{
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/* search failed */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed *ident==%"S32_F,*ident));
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return NULL;
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}
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}
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else if(node_type == MIB_NODE_EX)
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{
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struct mib_external_node *en;
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u16_t i;
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/* external node (addressing and access via functions) */
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en = (struct mib_external_node *)node;
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i = 0;
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while ((i < en->count) && en->ident_cmp(i,*ident))
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{
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i++;
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}
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if (i < en->count)
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{
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if (ident_len > 0)
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{
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if (en->get_nptr(i) == NULL)
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{
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/** @todo, this object is elsewhere, we can only start the request,
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but can't return something usefull yet.*/
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en->req_object_def(ident_len, ident);
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return (struct mib_node*)en;
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}
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else
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{
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/* found it, proceed to child */
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ident_len--;
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ident++;
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node = (struct mib_node*)en->get_nptr(i);
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}
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}
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else
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{
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/* search failed, short object identifier (nosuchname) */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed, short object identifier"));
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return NULL;
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}
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}
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else
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{
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/* search failed */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed *ident==%"S32_F,*ident));
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return NULL;
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}
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}
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}
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/* done, found nothing */
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LWIP_DEBUGF(SNMP_MIB_DEBUG,("search failed node==%p",(void*)node));
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return NULL;
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}
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#endif /* LWIP_SNMP */
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