Xray-core/app/router/condition.go

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2020-11-25 13:01:53 +02:00
package router
import (
"strings"
"go.starlark.net/starlark"
"go.starlark.net/syntax"
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"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/strmatcher"
"github.com/xtls/xray-core/features/routing"
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)
type Condition interface {
Apply(ctx routing.Context) bool
}
type ConditionChan []Condition
func NewConditionChan() *ConditionChan {
var condChan ConditionChan = make([]Condition, 0, 8)
return &condChan
}
func (v *ConditionChan) Add(cond Condition) *ConditionChan {
*v = append(*v, cond)
return v
}
// Apply applies all conditions registered in this chan.
func (v *ConditionChan) Apply(ctx routing.Context) bool {
for _, cond := range *v {
if !cond.Apply(ctx) {
return false
}
}
return true
}
func (v *ConditionChan) Len() int {
return len(*v)
}
var matcherTypeMap = map[Domain_Type]strmatcher.Type{
Domain_Plain: strmatcher.Substr,
Domain_Regex: strmatcher.Regex,
Domain_Domain: strmatcher.Domain,
Domain_Full: strmatcher.Full,
}
func domainToMatcher(domain *Domain) (strmatcher.Matcher, error) {
matcherType, f := matcherTypeMap[domain.Type]
if !f {
return nil, newError("unsupported domain type", domain.Type)
}
matcher, err := matcherType.New(domain.Value)
if err != nil {
return nil, newError("failed to create domain matcher").Base(err)
}
return matcher, nil
}
type DomainMatcher struct {
matchers strmatcher.IndexMatcher
}
func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
g := new(strmatcher.MatcherGroup)
for _, d := range domains {
m, err := domainToMatcher(d)
if err != nil {
return nil, err
}
g.Add(m)
}
return &DomainMatcher{
matchers: g,
}, nil
}
func (m *DomainMatcher) ApplyDomain(domain string) bool {
return len(m.matchers.Match(domain)) > 0
}
// Apply implements Condition.
func (m *DomainMatcher) Apply(ctx routing.Context) bool {
domain := ctx.GetTargetDomain()
if len(domain) == 0 {
return false
}
return m.ApplyDomain(strings.ToLower(domain))
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}
type MultiGeoIPMatcher struct {
matchers []*GeoIPMatcher
onSource bool
}
func NewMultiGeoIPMatcher(geoips []*GeoIP, onSource bool) (*MultiGeoIPMatcher, error) {
var matchers []*GeoIPMatcher
for _, geoip := range geoips {
matcher, err := globalGeoIPContainer.Add(geoip)
if err != nil {
return nil, err
}
matchers = append(matchers, matcher)
}
matcher := &MultiGeoIPMatcher{
matchers: matchers,
onSource: onSource,
}
return matcher, nil
}
// Apply implements Condition.
func (m *MultiGeoIPMatcher) Apply(ctx routing.Context) bool {
var ips []net.IP
if m.onSource {
ips = ctx.GetSourceIPs()
} else {
ips = ctx.GetTargetIPs()
}
for _, ip := range ips {
for _, matcher := range m.matchers {
if matcher.Match(ip) {
return true
}
}
}
return false
}
type PortMatcher struct {
port net.MemoryPortList
onSource bool
}
// NewPortMatcher create a new port matcher that can match source or destination port
func NewPortMatcher(list *net.PortList, onSource bool) *PortMatcher {
return &PortMatcher{
port: net.PortListFromProto(list),
onSource: onSource,
}
}
// Apply implements Condition.
func (v *PortMatcher) Apply(ctx routing.Context) bool {
if v.onSource {
return v.port.Contains(ctx.GetSourcePort())
} else {
return v.port.Contains(ctx.GetTargetPort())
}
}
type NetworkMatcher struct {
list [8]bool
}
func NewNetworkMatcher(network []net.Network) NetworkMatcher {
var matcher NetworkMatcher
for _, n := range network {
matcher.list[int(n)] = true
}
return matcher
}
// Apply implements Condition.
func (v NetworkMatcher) Apply(ctx routing.Context) bool {
return v.list[int(ctx.GetNetwork())]
}
type UserMatcher struct {
user []string
}
func NewUserMatcher(users []string) *UserMatcher {
usersCopy := make([]string, 0, len(users))
for _, user := range users {
if len(user) > 0 {
usersCopy = append(usersCopy, user)
}
}
return &UserMatcher{
user: usersCopy,
}
}
// Apply implements Condition.
func (v *UserMatcher) Apply(ctx routing.Context) bool {
user := ctx.GetUser()
if len(user) == 0 {
return false
}
for _, u := range v.user {
if u == user {
return true
}
}
return false
}
type InboundTagMatcher struct {
tags []string
}
func NewInboundTagMatcher(tags []string) *InboundTagMatcher {
tagsCopy := make([]string, 0, len(tags))
for _, tag := range tags {
if len(tag) > 0 {
tagsCopy = append(tagsCopy, tag)
}
}
return &InboundTagMatcher{
tags: tagsCopy,
}
}
// Apply implements Condition.
func (v *InboundTagMatcher) Apply(ctx routing.Context) bool {
tag := ctx.GetInboundTag()
if len(tag) == 0 {
return false
}
for _, t := range v.tags {
if t == tag {
return true
}
}
return false
}
type ProtocolMatcher struct {
protocols []string
}
func NewProtocolMatcher(protocols []string) *ProtocolMatcher {
pCopy := make([]string, 0, len(protocols))
for _, p := range protocols {
if len(p) > 0 {
pCopy = append(pCopy, p)
}
}
return &ProtocolMatcher{
protocols: pCopy,
}
}
// Apply implements Condition.
func (m *ProtocolMatcher) Apply(ctx routing.Context) bool {
protocol := ctx.GetProtocol()
if len(protocol) == 0 {
return false
}
for _, p := range m.protocols {
if strings.HasPrefix(protocol, p) {
return true
}
}
return false
}
type AttributeMatcher struct {
program *starlark.Program
}
func NewAttributeMatcher(code string) (*AttributeMatcher, error) {
starFile, err := syntax.Parse("attr.star", "satisfied=("+code+")", 0)
if err != nil {
return nil, newError("attr rule").Base(err)
}
p, err := starlark.FileProgram(starFile, func(name string) bool {
return name == "attrs"
})
if err != nil {
return nil, err
}
return &AttributeMatcher{
program: p,
}, nil
}
// Match implements attributes matching.
func (m *AttributeMatcher) Match(attrs map[string]string) bool {
attrsDict := new(starlark.Dict)
for key, value := range attrs {
attrsDict.SetKey(starlark.String(key), starlark.String(value))
}
predefined := make(starlark.StringDict)
predefined["attrs"] = attrsDict
thread := &starlark.Thread{
Name: "matcher",
}
results, err := m.program.Init(thread, predefined)
if err != nil {
newError("attr matcher").Base(err).WriteToLog()
}
satisfied := results["satisfied"]
return satisfied != nil && bool(satisfied.Truth())
}
// Apply implements Condition.
func (m *AttributeMatcher) Apply(ctx routing.Context) bool {
attributes := ctx.GetAttributes()
if attributes == nil {
return false
}
return m.Match(attributes)
}