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validator.go
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validator.go
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/*
* Copyright (C) 2016 Red Hat, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy ofthe License at
*
* http:https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specificlanguage governing permissions and
* limitations under the License.
*
*/
package validator
import (
"errors"
"fmt"
"net"
"strings"
"github.com/google/gopacket/layers"
valid "gopkg.in/validator.v2"
"github.com/skydive-project/skydive/flow"
"github.com/skydive-project/skydive/flow/probes"
"github.com/skydive-project/skydive/graffiti/graph/traversal"
"github.com/skydive-project/skydive/graffiti/schema"
"github.com/skydive-project/skydive/graffiti/service"
ge "github.com/skydive-project/skydive/gremlin/traversal"
"github.com/skydive-project/skydive/topology"
)
type validator struct {
validator *valid.Validator
schemaValidator schema.Validator
}
var (
// Validator is the global validator for all Skydive resources
Validator *validator
//IPNotValid validator
IPNotValid = func() error {
return valid.TextErr{Err: errors.New("Not an IP address")}
}
// GremlinNotValid validator
GremlinNotValid = func(err error) error {
return valid.TextErr{Err: fmt.Errorf("Not a valid Gremlin expression: %s", err)}
}
// BPFFilterNotValid validator
BPFFilterNotValid = func(err error) error {
return valid.TextErr{Err: fmt.Errorf("Not a valid BPF expression: %s", err)}
}
// CaptureHeaderSizeNotValid validator
CaptureHeaderSizeNotValid = func(min, max uint32) error {
return valid.TextErr{Err: fmt.Errorf("A valid header size is >= %d && <= %d", min, max)}
}
// RawPacketLimitNotValid validator
RawPacketLimitNotValid = func(min, max uint32) error {
return valid.TextErr{Err: fmt.Errorf("A valid raw packet limit size is > %d && <= %d", min, max)}
}
//LayerKeyModeNotValid validator
LayerKeyModeNotValid = func() error {
return valid.TextErr{Err: errors.New("Not a valid layer key mode")}
}
//CaptureTypeNotValid validator
CaptureTypeNotValid = func(t string) error {
return valid.TextErr{Err: fmt.Errorf("Not a valid capture type: %s, available types: %v", t, probes.ProbeTypes)}
}
//AddressNotValid validator
AddressNotValid = func() error {
return valid.TextErr{Err: errors.New("Not a valid address")}
}
//MACNotValid validator
MACNotValid = func() error {
return valid.TextErr{Err: errors.New("Not a MAC address")}
}
//IPOrCIDRNotValid validator
IPOrCIDRNotValid = func() error {
return valid.TextErr{Err: errors.New("Not a IP or CIDR address")}
}
)
func isValidAddress(v interface{}, param string) error {
addr, ok := v.(string)
if !ok {
return AddressNotValid()
}
if addr == "" {
return nil
}
if _, err := service.AddressFromString(addr); err != nil {
return AddressNotValid()
}
return nil
}
func isIP(v interface{}, param string) error {
switch v := v.(type) {
case string:
/* Parse/Check IPv4 and IPv6 address */
if v == "" {
return nil
} else if n := net.ParseIP(v); n == nil {
return IPNotValid()
}
return nil
case net.IP:
return nil
default:
return IPNotValid()
}
}
func isMAC(v interface{}, param string) error {
switch v := v.(type) {
case string:
if v == "" {
return nil
} else if _, err := net.ParseMAC(v); err != nil {
return MACNotValid()
}
case net.HardwareAddr:
if len(v) == 0 {
return nil
}
if len(v) != 6 {
return MACNotValid()
}
}
return nil
}
func isIPOrCIDR(v interface{}, param string) error {
switch v := v.(type) {
case string:
if v == "" {
return nil
}
if strings.Contains(v, "/") {
if _, _, err := net.ParseCIDR(v); err != nil {
return IPOrCIDRNotValid()
}
} else {
if n := net.ParseIP(v); n == nil {
return IPOrCIDRNotValid()
}
}
return nil
case net.IPNet:
return nil
case net.IP:
return nil
default:
return IPOrCIDRNotValid()
}
}
func isGremlinExpr(v interface{}, param string) error {
query, ok := v.(string)
if !ok {
return GremlinNotValid(errors.New("not a string"))
}
tr := traversal.NewGremlinTraversalParser()
tr.AddTraversalExtension(ge.NewMetricsTraversalExtension())
tr.AddTraversalExtension(ge.NewFlowTraversalExtension(nil, nil))
tr.AddTraversalExtension(ge.NewSocketsTraversalExtension())
tr.AddTraversalExtension(ge.NewRawPacketsTraversalExtension())
tr.AddTraversalExtension(ge.NewDescendantsTraversalExtension())
tr.AddTraversalExtension(ge.NewAscendantsTraversalExtension())
tr.AddTraversalExtension(ge.NewNeighborsTraversalExtension())
tr.AddTraversalExtension(ge.NewNextHopTraversalExtension())
tr.AddTraversalExtension(ge.NewGroupTraversalExtension())
tr.AddTraversalExtension(ge.NewWorkflowTraversalExtension(nil, nil))
if _, err := tr.Parse(strings.NewReader(query)); err != nil {
return GremlinNotValid(err)
}
return nil
}
func isGremlinOrEmpty(v interface{}, param string) error {
query, ok := v.(string)
if ok && strings.TrimSpace(query) == "" {
return nil
}
return isGremlinExpr(v, param)
}
func isBPFFilter(v interface{}, param string) error {
bpfFilter, ok := v.(string)
if !ok {
return BPFFilterNotValid(errors.New("not a string"))
}
if _, err := flow.BPFFilterToRaw(layers.LinkTypeEthernet, flow.MaxCaptureLength, bpfFilter); err != nil {
return BPFFilterNotValid(err)
}
return nil
}
func isValidCaptureHeaderSize(v interface{}, param string) error {
headerSize, ok := v.(int)
hs := uint32(headerSize)
if !ok || hs < 0 || (hs > 0 && hs < 14) || hs > flow.MaxCaptureLength {
return CaptureHeaderSizeNotValid(14, flow.MaxCaptureLength)
}
return nil
}
func isValidRawPacketLimit(v interface{}, param string) error {
limit, ok := v.(int)
l := uint32(limit)
// The current limitation of 10 packet could be removed once flow will be
// transferred over tcp.
if !ok || l < 0 || l > flow.MaxRawPacketLimit {
return RawPacketLimitNotValid(0, flow.MaxRawPacketLimit)
}
return nil
}
func isValidLayerKeyMode(v interface{}, param string) error {
name, ok := v.(string)
if !ok {
return LayerKeyModeNotValid()
}
if len(name) == 0 {
return nil
}
if _, err := flow.LayerKeyModeByName(name); err != nil {
return LayerKeyModeNotValid()
}
return nil
}
func isValidWorkflow(v interface{}, param string) error {
// Check that `v` is valid JS code that returns
// a promise
return nil
}
func isValidCaptureType(v interface{}, param string) error {
typ, ok := v.(string)
if !ok {
return CaptureTypeNotValid("null")
}
if len(typ) == 0 {
return nil
}
for _, t := range probes.ProbeTypes {
if t == typ {
return nil
}
}
return CaptureTypeNotValid(typ)
}
// Validate an object based on previously (at init) registered function
func (v *validator) Validate(kind string, value interface{}) error {
if err := Validator.validator.Validate(value); err != nil {
return err
}
return Validator.schemaValidator.Validate(kind, value)
}
// Validate an object based on previously (at init) registered function
func Validate(kind string, value interface{}) error {
return Validator.Validate(kind, value)
}
func init() {
v := valid.NewValidator()
v.SetValidationFunc("isIP", isIP)
v.SetValidationFunc("isMAC", isMAC)
v.SetValidationFunc("isIPOrCIDR", isIPOrCIDR)
v.SetValidationFunc("isGremlinExpr", isGremlinExpr)
v.SetValidationFunc("isGremlinOrEmpty", isGremlinOrEmpty)
v.SetValidationFunc("isBPFFilter", isBPFFilter)
v.SetValidationFunc("isValidCaptureHeaderSize", isValidCaptureHeaderSize)
v.SetValidationFunc("isValidRawPacketLimit", isValidRawPacketLimit)
v.SetValidationFunc("isValidLayerKeyMode", isValidLayerKeyMode)
v.SetValidationFunc("isValidWorkflow", isValidWorkflow)
v.SetValidationFunc("isValidCaptureType", isValidCaptureType)
v.SetValidationFunc("isValidAddress", isValidAddress)
v.SetTag("valid")
Validator = &validator{
validator: v,
schemaValidator: topology.SchemaValidator,
}
}