// Query takes a URI in RFC 4088 format, does an SNMP query and returns the results.
func Query(params *QueryParams) (results *llrb.Tree, err error) {
parsed_uri, err := parseURI(params.Uri)
if Debug {
applog.Debugf("parsed_uri: %s\n\n", parsed_uri)
}
if err != nil {
return nil, err
}
path := C.GoString((*C.char)(parsed_uri.path))
if Debug {
applog.Warningf("number of incoming uris: %d", uriCount(path))
}
if err := uriCountMaxed(path, MAX_URI_COUNT); err != nil {
return nil, err
}
vbl, uritype, err := parsePath(params.Uri, parsed_uri)
defer uriDelete(parsed_uri)
if Debug {
applog.Debugf("vbl, uritype: %s, %s", gListOidsString(vbl), uritype)
}
if err != nil {
return nil, err
}
session, err := newUri(params, parsed_uri)
/*
causing <undefined symbol: gnet_snmp_taddress_get_short_name>
if Debug {
applog.Warningf("session: %s\n\n", session)
}
*/
if err != nil {
return nil, err
}
vbl_results, err := querySync(session, vbl, uritype, params.Version)
defer vblDelete(vbl_results)
if err != nil {
return nil, err
}
return convertResults(params, vbl_results), nil
}
// convertResults converts C results to a Go struct.
func convertResults(params *QueryParams, out *_Ctype_GList) (results *llrb.Tree) {
var out_count int
// create or re-use an existing llrb Tree
if params.Tree == nil {
results = llrb.New(LessOID)
} else {
results = params.Tree
}
for {
if out == nil {
// finished
if Debug {
applog.Warningf("number of results converted: %d", out_count)
}
return results
}
// another result: initialise
out_count++
data := (*C.GNetSnmpVarBind)(out.data)
oid := gIntArrayOidString(data.oid, data.oid_len)
var value Varbinder
// convert C values to Go values
vbt := VarBindType(data._type)
switch vbt {
case GNET_SNMP_VARBIND_TYPE_NULL:
value = new(VBT_Null)
case GNET_SNMP_VARBIND_TYPE_OCTETSTRING:
value = VBT_OctetString(union_ui8v_string(data.value, data.value_len))
case GNET_SNMP_VARBIND_TYPE_OBJECTID:
guint32_ptr := union_ui32v(data.value)
value = VBT_ObjectID("." + gIntArrayOidString(guint32_ptr, data.value_len))
case GNET_SNMP_VARBIND_TYPE_IPADDRESS:
value = VBT_IPAddress(union_ui8v_ipaddress(data.value, data.value_len))
case GNET_SNMP_VARBIND_TYPE_INTEGER32:
value = VBT_Integer32(union_i32(data.value))
case GNET_SNMP_VARBIND_TYPE_UNSIGNED32:
value = VBT_Unsigned32(union_ui32(data.value))
case GNET_SNMP_VARBIND_TYPE_COUNTER32:
value = VBT_Counter32(union_ui32(data.value))
case GNET_SNMP_VARBIND_TYPE_TIMETICKS:
value = VBT_Timeticks(union_ui32(data.value))
case GNET_SNMP_VARBIND_TYPE_OPAQUE:
value = VBT_Opaque(union_ui8v_hexstring(data.value, data.value_len))
case GNET_SNMP_VARBIND_TYPE_COUNTER64:
value = VBT_Counter64(union_ui64(data.value))
case GNET_SNMP_VARBIND_TYPE_NOSUCHOBJECT:
value = new(VBT_NoSuchObject)
case GNET_SNMP_VARBIND_TYPE_NOSUCHINSTANCE:
value = new(VBT_NoSuchInstance)
case GNET_SNMP_VARBIND_TYPE_ENDOFMIBVIEW:
value = new(VBT_EndOfMibView)
}
result := QueryResult{Oid: oid, Value: value}
results.ReplaceOrInsert(result)
// move on to next element in list
out = out.next
}
panic(fmt.Sprintf("%s: convertResults(): fell out of for loop", libname()))
}