/** handles requests for the expExpressionTable table */
int
expExpressionTable_handler(netsnmp_mib_handler *handler,
netsnmp_handler_registration *reginfo,
netsnmp_agent_request_info *reqinfo,
netsnmp_request_info *requests)
{
netsnmp_request_info *request;
netsnmp_table_request_info *tinfo;
netsnmp_tdata_row *row;
struct expExpression *entry;
char expOwner[EXP_STR1_LEN+1];
char expName[ EXP_STR1_LEN+1];
long ret;
DEBUGMSGTL(("disman:expr:mib", "Expression Table handler (%d)\n",
reqinfo->mode));
switch (reqinfo->mode) {
/*
* Read-support (also covers GetNext requests)
*/
case MODE_GET:
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
entry = (struct expExpression *)
netsnmp_tdata_extract_entry(request);
tinfo = netsnmp_extract_table_info(request);
if (!entry || !(entry->flags & EXP_FLAG_VALID))
continue;
switch (tinfo->colnum) {
case COLUMN_EXPEXPRESSION:
snmp_set_var_typed_value(request->requestvb, ASN_OCTET_STR,
(u_char*)entry->expExpression,
strlen(entry->expExpression));
break;
case COLUMN_EXPEXPRESSIONVALUETYPE:
snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
entry->expValueType);
break;
case COLUMN_EXPEXPRESSIONCOMMENT:
snmp_set_var_typed_value(request->requestvb, ASN_OCTET_STR,
(u_char*)entry->expComment,
strlen(entry->expComment));
break;
case COLUMN_EXPEXPRESSIONDELTAINTERVAL:
snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER,
entry->expDeltaInterval);
break;
case COLUMN_EXPEXPRESSIONPREFIX:
/*
* XXX - Need to search expObjectTable for a suitable OID
*/
/*
* Empty OIDs (len=0) are converted into .0.0
* by the SNMP library automatically :-(
*/
if ( entry->expPrefix_len ) {
snmp_set_var_typed_value(request->requestvb, ASN_OBJECT_ID,
(u_char *) entry->expPrefix,
entry->expPrefix_len*sizeof(oid));
} else {
/* XXX - possibly not needed */
request->requestvb->type = ASN_OBJECT_ID;
request->requestvb->val_len = 0;
}
break;
case COLUMN_EXPEXPRESSIONERRORS:
snmp_set_var_typed_integer(request->requestvb, ASN_COUNTER,
entry->expErrorCount);
break;
case COLUMN_EXPEXPRESSIONENTRYSTATUS:
/* What would indicate 'notReady' ? */
ret = (entry->flags & EXP_FLAG_ACTIVE) ?
RS_ACTIVE : RS_NOTINSERVICE;
snmp_set_var_typed_integer(request->requestvb, ASN_INTEGER, ret);
break;
}
}
break;
/*
* Write-support
*/
case MODE_SET_RESERVE1:
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
entry = (struct expExpression *)
netsnmp_tdata_extract_entry(request);
tinfo = netsnmp_extract_table_info(request);
switch (tinfo->colnum) {
case COLUMN_EXPEXPRESSION:
ret = netsnmp_check_vb_type_and_max_size(
request->requestvb, ASN_OCTET_STR, EXP_STR3_LEN);
/* XXX - check new expression is syntactically valid */
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, request, ret);
return SNMP_ERR_NOERROR;
}
break;
case COLUMN_EXPEXPRESSIONVALUETYPE:
ret = netsnmp_check_vb_int_range(request->requestvb, 1, 8);
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, request, ret);
return SNMP_ERR_NOERROR;
}
break;
case COLUMN_EXPEXPRESSIONCOMMENT:
ret = netsnmp_check_vb_type_and_max_size(
request->requestvb, ASN_OCTET_STR, EXP_STR2_LEN);
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, request, ret);
return SNMP_ERR_NOERROR;
}
break;
case COLUMN_EXPEXPRESSIONDELTAINTERVAL:
ret = netsnmp_check_vb_int_range(request->requestvb, 0, 86400);
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, request, ret);
return SNMP_ERR_NOERROR;
}
break;
case COLUMN_EXPEXPRESSIONENTRYSTATUS:
ret = netsnmp_check_vb_rowstatus(request->requestvb,
(entry ? RS_ACTIVE : RS_NONEXISTENT));
if (ret != SNMP_ERR_NOERROR) {
netsnmp_set_request_error(reqinfo, request, ret);
return SNMP_ERR_NOERROR;
}
break;
default:
netsnmp_set_request_error(reqinfo, request,
SNMP_ERR_NOTWRITABLE);
return SNMP_ERR_NOERROR;
}
}
break;
case MODE_SET_RESERVE2:
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
tinfo = netsnmp_extract_table_info(request);
switch (tinfo->colnum) {
case COLUMN_EXPEXPRESSIONENTRYSTATUS:
switch (*request->requestvb->val.integer) {
case RS_CREATEANDGO:
case RS_CREATEANDWAIT:
/*
* Create an (empty) new row structure
*/
memset(expOwner, 0, sizeof(expOwner));
memcpy(expOwner, tinfo->indexes->val.string,
tinfo->indexes->val_len);
memset(expName, 0, sizeof(expName));
memcpy(expName,
tinfo->indexes->next_variable->val.string,
tinfo->indexes->next_variable->val_len);
row = expExpression_createRow(expOwner, expName, 0);
if (!row) {
netsnmp_set_request_error(reqinfo, request,
SNMP_ERR_RESOURCEUNAVAILABLE);
return SNMP_ERR_NOERROR;
}
netsnmp_insert_tdata_row( request, row );
}
}
}
break;
case MODE_SET_FREE:
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
tinfo = netsnmp_extract_table_info(request);
switch (tinfo->colnum) {
case COLUMN_EXPEXPRESSIONENTRYSTATUS:
switch (*request->requestvb->val.integer) {
case RS_CREATEANDGO:
case RS_CREATEANDWAIT:
/*
* Tidy up after a failed row creation request
*/
entry = (struct expExpression *)
netsnmp_tdata_extract_entry(request);
if (entry &&
!(entry->flags & EXP_FLAG_VALID)) {
row = (netsnmp_tdata_row *)
netsnmp_tdata_extract_row(request);
expExpression_removeEntry( row );
}
}
}
}
break;
case MODE_SET_ACTION:
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
tinfo = netsnmp_extract_table_info(request);
entry = (struct expExpression *)
netsnmp_tdata_extract_entry(request);
if (!entry) {
/*
* New rows must be created via the RowStatus column
*/
netsnmp_set_request_error(reqinfo, request,
SNMP_ERR_NOCREATION);
/* or inconsistentName? */
return SNMP_ERR_NOERROR;
}
}
break;
case MODE_SET_UNDO:
break;
case MODE_SET_COMMIT:
/*
* All these assignments are "unfailable", so it's
* (reasonably) safe to apply them in the Commit phase
*/
for (request = requests; request; request = request->next) {
if (request->processed)
continue;
entry = (struct expExpression *)
netsnmp_tdata_extract_entry(request);
tinfo = netsnmp_extract_table_info(request);
switch (tinfo->colnum) {
case COLUMN_EXPEXPRESSION:
memset(entry->expExpression, 0, EXP_STR3_LEN+1);
memcpy(entry->expExpression,
request->requestvb->val.string,
request->requestvb->val_len);
break;
case COLUMN_EXPEXPRESSIONVALUETYPE:
entry->expValueType = *request->requestvb->val.integer;
break;
case COLUMN_EXPEXPRESSIONCOMMENT:
memset(entry->expComment, 0, EXP_STR2_LEN+1);
memcpy(entry->expComment,
request->requestvb->val.string,
request->requestvb->val_len);
break;
case COLUMN_EXPEXPRESSIONDELTAINTERVAL:
entry->expDeltaInterval = *request->requestvb->val.integer;
break;
case COLUMN_EXPEXPRESSIONENTRYSTATUS:
switch (*request->requestvb->val.integer) {
case RS_ACTIVE:
entry->flags |= EXP_FLAG_ACTIVE;
expExpression_enable( entry );
break;
case RS_NOTINSERVICE:
entry->flags &= ~EXP_FLAG_ACTIVE;
expExpression_disable( entry );
break;
case RS_CREATEANDGO:
entry->flags |= EXP_FLAG_ACTIVE;
entry->flags |= EXP_FLAG_VALID;
entry->session =
netsnmp_iquery_pdu_session(reqinfo->asp->pdu);
expExpression_enable( entry );
break;
case RS_CREATEANDWAIT:
entry->flags |= EXP_FLAG_VALID;
entry->session =
netsnmp_iquery_pdu_session(reqinfo->asp->pdu);
break;
case RS_DESTROY:
row = (netsnmp_tdata_row *)
netsnmp_tdata_extract_row(request);
expExpression_removeEntry(row);
}
}
}
break;
}
DEBUGMSGTL(("disman:expr:mib", "Expression Table handler - done \n"));
return SNMP_ERR_NOERROR;
}
void
parse_expression(const char *token, char *line)
{
char buf[ SPRINT_MAX_LEN];
char ename[EXP_STR1_LEN+1];
oid name_buf[MAX_OID_LEN];
size_t name_len;
char *cp, *cp2;
struct expExpression *entry;
struct expObject *object;
netsnmp_session *sess = NULL;
int type=EXPVALTYPE_COUNTER;
int i=1;
DEBUGMSGTL(("disman:expr:conf", "Parsing expression config... "));
memset(buf, 0, sizeof(buf));
memset(ename, 0, sizeof(ename));
for (cp = copy_nword(line, buf, SPRINT_MAX_LEN);
;
cp = copy_nword(cp, buf, SPRINT_MAX_LEN)) {
if (buf[0] == '-' ) {
switch (buf[1]) {
case 't': /* type */
switch (buf[2]) {
case 'c': type = EXPVALTYPE_COUNTER; break;
case 'u': type = EXPVALTYPE_UNSIGNED; break;
case 't': type = EXPVALTYPE_TIMETICKS; break;
case 'i': type = EXPVALTYPE_INTEGER; break;
case 'a': type = EXPVALTYPE_IPADDRESS; break;
case 's': type = EXPVALTYPE_STRING; break;
case 'o': type = EXPVALTYPE_OID; break;
case 'C': type = EXPVALTYPE_COUNTER64; break;
}
break;
case 'u': /* user */
cp = copy_nword(cp, buf, SPRINT_MAX_LEN);
sess = netsnmp_iquery_user_session(buf);
break;
}
} else {
break;
}
}
memcpy(ename, buf, sizeof(ename));
/* cp = copy_nword(line, ename, sizeof(ename)); */
entry = expExpression_createEntry( "snmpd.conf", ename, 1 );
if (!entry)
return;
cp2 = entry->expExpression;
while (cp && *cp) {
/*
* Copy everything that can't possibly be a MIB
* object name into the expression field...
*/
/* XXX - TODO - Handle string literals */
if (!isalpha(*cp)) {
*cp2++ = *cp++;
continue;
}
/*
* ... and copy the defined functions across as well
* XXX - TODO
*/
/*
* Anything else is presumably a MIB object (or instance).
* Create an entry in the expObjectTable, and insert a
* corresponding parameter in the expression itself.
*/
name_len = MAX_OID_LEN;
cp = copy_nword(cp, buf, SPRINT_MAX_LEN);
snmp_parse_oid( buf, name_buf, &name_len );
object = expObject_createEntry( "snmpd.conf", ename, i, 1 );
memcpy( object->expObjectID, name_buf, name_len*sizeof(oid));
object->expObjectID_len = name_len;
object->flags |= EXP_OBJ_FLAG_VALID
| EXP_OBJ_FLAG_ACTIVE
| EXP_OBJ_FLAG_OWILD;
/*
* The first such object can also be used as the
* expExpressionPrefix
*/
if ( i == 1 ) {
memcpy( entry->expPrefix, name_buf, name_len*sizeof(oid));
entry->expPrefix_len = name_len;
object->flags |= EXP_OBJ_FLAG_PREFIX;
}
sprintf(cp2, "$%d", i++);
while (*cp2)
cp2++; /* Skip over this parameter */
}
if (sess)
entry->session = sess;
else
entry->session = netsnmp_query_get_default_session();
entry->expDeltaInterval = 10;
entry->expValueType = type;
entry->flags |= EXP_FLAG_VALID
| EXP_FLAG_ACTIVE;
expExpression_enable( entry );
DEBUGMSG(("disman:expr:conf", "(%s, %s)\n", ename,
entry->expExpression));
}
