Example #1
0
// 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
}
Example #2
0
// 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()))
}