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#include <net-snmp/net-snmp-config.h>
#include <stdlib.h>
#if HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/agent/scalar_group.h>
#include <net-snmp/agent/scalar.h>
#include <net-snmp/agent/serialize.h>
#include <net-snmp/agent/read_only.h>
/** @defgroup scalar_group_group scalar_group
* Process groups of scalars.
* @ingroup leaf
* @{
*/
netsnmp_mib_handler *
netsnmp_get_scalar_group_handler(oid first, oid last)
{
netsnmp_mib_handler *ret = NULL;
netsnmp_scalar_group *sgroup = NULL;
ret = netsnmp_create_handler("scalar_group",
netsnmp_scalar_group_helper_handler);
if (ret) {
sgroup = SNMP_MALLOC_TYPEDEF(netsnmp_scalar_group);
if (NULL == sgroup) {
netsnmp_handler_free(ret);
ret = NULL;
}
else {
sgroup->lbound = first;
sgroup->ubound = last;
ret->myvoid = (void *)sgroup;
}
}
return ret;
}
int
netsnmp_register_scalar_group(netsnmp_handler_registration *reginfo,
oid first, oid last)
{
netsnmp_inject_handler(reginfo, netsnmp_get_instance_handler());
netsnmp_inject_handler(reginfo, netsnmp_get_scalar_handler());
netsnmp_inject_handler(reginfo, netsnmp_get_scalar_group_handler(first, last));
return netsnmp_register_serialize(reginfo);
}
int
netsnmp_scalar_group_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;
netsnmp_scalar_group *sgroup = (netsnmp_scalar_group *)handler->myvoid;
int ret, cmp;
int namelen;
oid subid, root_tmp[MAX_OID_LEN], *root_save;
DEBUGMSGTL(("helper:scalar_group", "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_group", " cmp=%d, oid:", cmp));
DEBUGMSGOID(("helper:scalar_group", var->name, var->name_length));
DEBUGMSG(( "helper:scalar_group", "\n"));
/*
* copy root oid to root_tmp, set instance to 0. (subid set later on)
* save rootoid, since we'll replace it before calling next handler,
* and need to restore it afterwards.
*/
memcpy(root_tmp, reginfo->rootoid, reginfo->rootoid_len * sizeof(oid));
root_tmp[reginfo->rootoid_len + 1] = 0;
root_save = reginfo->rootoid;
ret = SNMP_ERR_NOCREATION;
switch (reqinfo->mode) {
/*
* The handling of "exact" requests is basically the same.
* The only difference between GET and SET requests is the
* error/exception to return on failure.
*/
case MODE_GET:
ret = SNMP_NOSUCHOBJECT;
/* Fallthrough */
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 ||
requests->requestvb->name_length <= reginfo->rootoid_len) {
/*
* Common prefix doesn't match, or only *just* matches
* the registered root (so can't possibly match a scalar)
*/
netsnmp_set_request_error(reqinfo, requests, ret);
return SNMP_ERR_NOERROR;
} else {
/*
* Otherwise,
* extract the object subidentifier from the request,
* check this is (probably) valid, and then fudge the
* registered 'rootoid' to match, before passing the
* request off to the next handler ('scalar').
*
* Note that we don't bother checking instance subidentifiers
* here. That's left to the scalar helper.
*/
subid = requests->requestvb->name[reginfo->rootoid_len];
if (subid < sgroup->lbound ||
subid > sgroup->ubound) {
netsnmp_set_request_error(reqinfo, requests, ret);
return SNMP_ERR_NOERROR;
}
root_tmp[reginfo->rootoid_len++] = subid;
reginfo->rootoid = root_tmp;
ret = netsnmp_call_next_handler(handler, reginfo, reqinfo,
requests);
reginfo->rootoid = root_save;
reginfo->rootoid_len--;
return ret;
}
break;
case MODE_GETNEXT:
/*
* If we're being asked for something before (or exactly matches)
* the registered root OID, then start with the first object.
* If we're being asked for something that exactly matches an object
* OID, then that's what we pass down.
* Otherwise, we pass down the OID of the *next* object....
*/
if (cmp < 0 ||
requests->requestvb->name_length <= reginfo->rootoid_len) {
subid = sgroup->lbound;
} else if (requests->requestvb->name_length == reginfo->rootoid_len+1)
subid = requests->requestvb->name[reginfo->rootoid_len];
else
subid = requests->requestvb->name[reginfo->rootoid_len]+1;
/*
* ... always assuming this is (potentially) valid, of course.
*/
if (subid < sgroup->lbound)
subid = sgroup->lbound;
else if (subid > sgroup->ubound)
return SNMP_ERR_NOERROR;
root_tmp[reginfo->rootoid_len++] = subid;
reginfo->rootoid = root_tmp;
ret = netsnmp_call_next_handler(handler, reginfo, reqinfo,
requests);
/*
* If we didn't get an answer (due to holes in the group)
* set things up to retry again.
*/
if (!requests->delegated &&
(requests->requestvb->type == ASN_NULL ||
requests->requestvb->type == SNMP_NOSUCHOBJECT ||
requests->requestvb->type == SNMP_NOSUCHINSTANCE)) {
snmp_set_var_objid(requests->requestvb,
reginfo->rootoid, reginfo->rootoid_len);
requests->requestvb->name[reginfo->rootoid_len-1] = ++subid;
requests->requestvb->type = ASN_PRIV_RETRY;
}
reginfo->rootoid = root_save;
reginfo->rootoid_len--;
return ret;
}
/*
* got here only if illegal mode found
*/
return SNMP_ERR_GENERR;
}
/** @}
*/
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