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/* Portions of this file are subject to the following copyright(s). See
* the Net-SNMP's COPYING file for more details and other copyrights
* that may apply:
*/
/*
* Portions of this file are copyrighted by:
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms specified in the COPYING file
* distributed with the Net-SNMP package.
*/
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/agent/scalar.h>
#include <stdlib.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <net-snmp/agent/instance.h>
#include <net-snmp/agent/serialize.h>
#include <net-snmp/agent/read_only.h>
/** @defgroup scalar scalar
* Process scalars easily.
* @ingroup leaf
* @{
*/
/**
* Creates a scalar handler calling netsnmp_create_handler with a
* handler name defaulted to "scalar" and access method,
* netsnmp_scalar_helper_handler.
*
* @return Returns a pointer to a netsnmp_mib_handler struct which contains
* the handler's name and the access method
*
* @see netsnmp_get_scalar_handler
* @see netsnmp_register_scalar
*/
netsnmp_mib_handler *
netsnmp_get_scalar_handler(void)
{
return netsnmp_create_handler("scalar",
netsnmp_scalar_helper_handler);
}
/**
* This function registers a scalar helper handler. The registered OID,
* reginfo->rootoid, space is extended for the instance subid using
* realloc() but the reginfo->rootoid_len length is not extended just yet.
* .This function subsequently injects the instance, scalar, and serialize
* helper handlers before actually registering reginfo.
*
* Each handler is injected/pushed to the top of the handler chain list
* and will be processed last in first out, LIFO.
*
* @param reginfo a handler registration structure which could get created
* using netsnmp_create_handler_registration. Used to register
* a scalar helper handler.
*
* @return MIB_REGISTERED_OK is returned if the registration was a success.
* Failures are MIB_REGISTRATION_FAILURE and MIB_DUPLICATE_REGISTRATION.
*
* @see netsnmp_register_read_only_scalar
* @see netsnmp_get_scalar_handler
*/
int
netsnmp_register_scalar(netsnmp_handler_registration *reginfo)
{
/*
* Extend the registered OID with space for the instance subid
* (but don't extend the length just yet!)
*/
reginfo->rootoid = (oid*)realloc(reginfo->rootoid,
(reginfo->rootoid_len+1) * sizeof(oid) );
reginfo->rootoid[ reginfo->rootoid_len ] = 0;
netsnmp_inject_handler(reginfo, netsnmp_get_instance_handler());
netsnmp_inject_handler(reginfo, netsnmp_get_scalar_handler());
return netsnmp_register_serialize(reginfo);
}
/**
* This function registers a read only scalar helper handler. This
* function is very similar to netsnmp_register_scalar the only addition
* is that the "read_only" handler is injected into the handler chain
* prior to injecting the serialize handler and registering reginfo.
*
* @param reginfo a handler registration structure which could get created
* using netsnmp_create_handler_registration. Used to register
* a read only scalar helper handler.
*
* @return MIB_REGISTERED_OK is returned if the registration was a success.
* Failures are MIB_REGISTRATION_FAILURE and MIB_DUPLICATE_REGISTRATION.
*
* @see netsnmp_register_scalar
* @see netsnmp_get_scalar_handler
*
*/
int
netsnmp_register_read_only_scalar(netsnmp_handler_registration *reginfo)
{
/*
* Extend the registered OID with space for the instance subid
* (but don't extend the length just yet!)
*/
reginfo->rootoid = (oid*)realloc(reginfo->rootoid,
(reginfo->rootoid_len+1) * sizeof(oid) );
reginfo->rootoid[ reginfo->rootoid_len ] = 0;
netsnmp_inject_handler(reginfo, netsnmp_get_instance_handler());
netsnmp_inject_handler(reginfo, netsnmp_get_scalar_handler());
netsnmp_inject_handler(reginfo, netsnmp_get_read_only_handler());
return netsnmp_register_serialize(reginfo);
}
int
netsnmp_scalar_helper_handler(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
netsnmp_variable_list *var = requests->requestvb;
int ret, cmp;
int namelen;
DEBUGMSGTL(("helper:scalar", "Got request:\n"));
namelen = SNMP_MIN(requests->requestvb->name_length,
reginfo->rootoid_len);
cmp = snmp_oid_compare(requests->requestvb->name, namelen,
reginfo->rootoid, reginfo->rootoid_len);
DEBUGMSGTL(("helper:scalar", " oid:"));
DEBUGMSGOID(("helper:scalar", var->name, var->name_length));
DEBUGMSG(("helper:scalar", "\n"));
switch (reqinfo->mode) {
case MODE_GET:
if (cmp != 0) {
netsnmp_set_request_error(reqinfo, requests,
SNMP_NOSUCHOBJECT);
return SNMP_ERR_NOERROR;
} else {
reginfo->rootoid[reginfo->rootoid_len++] = 0;
ret = netsnmp_call_next_handler(handler, reginfo, reqinfo,
requests);
reginfo->rootoid_len--;
return ret;
}
break;
#ifndef NETSNMP_NO_WRITE_SUPPORT
case MODE_SET_RESERVE1:
case MODE_SET_RESERVE2:
case MODE_SET_ACTION:
case MODE_SET_COMMIT:
case MODE_SET_UNDO:
case MODE_SET_FREE:
if (cmp != 0) {
netsnmp_set_request_error(reqinfo, requests,
SNMP_ERR_NOCREATION);
return SNMP_ERR_NOERROR;
} else {
reginfo->rootoid[reginfo->rootoid_len++] = 0;
ret = netsnmp_call_next_handler(handler, reginfo, reqinfo,
requests);
reginfo->rootoid_len--;
return ret;
}
break;
#endif /* NETSNMP_NO_WRITE_SUPPORT */
case MODE_GETNEXT:
reginfo->rootoid[reginfo->rootoid_len++] = 0;
ret = netsnmp_call_next_handler(handler, reginfo, reqinfo, requests);
reginfo->rootoid_len--;
return ret;
}
/*
* got here only if illegal mode found
*/
return SNMP_ERR_GENERR;
}
/** @}
*/
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