Feat: add reverse match for GeoIP

(cherry picked from commit 3a50affa0a7316a9ad249f1b2b2996cb88948551)

app/router/condition_geoip.go

@@ -13,11 +13,12 @@ type ipv6 struct {
 }
 
 type GeoIPMatcher struct {
-	countryCode string
-	ip4         []uint32
-	prefix4     []uint8
-	ip6         []ipv6
-	prefix6     []uint8
+	countryCode  string
+	reverseMatch bool
+	ip4          []uint32
+	prefix4      []uint8
+	ip6          []ipv6
+	prefix6      []uint8
 }
 
 func normalize4(ip uint32, prefix uint8) uint32 {
@@ -80,6 +81,10 @@ func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
 	return nil
 }
 
+func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
+	m.reverseMatch = isReverseMatch
+}
+
 func (m *GeoIPMatcher) match4(ip uint32) bool {
 	if len(m.ip4) == 0 {
 		return false
@@ -147,8 +152,17 @@ func (m *GeoIPMatcher) match6(ip ipv6) bool {
 func (m *GeoIPMatcher) Match(ip net.IP) bool {
 	switch len(ip) {
 	case 4:
+		if m.reverseMatch {
+			return !m.match4(binary.BigEndian.Uint32(ip))
+		}
 		return m.match4(binary.BigEndian.Uint32(ip))
 	case 16:
+		if m.reverseMatch {
+			return !m.match6(ipv6{
+				a: binary.BigEndian.Uint64(ip[0:8]),
+				b: binary.BigEndian.Uint64(ip[8:16]),
+			})
+		}
 		return m.match6(ipv6{
 			a: binary.BigEndian.Uint64(ip[0:8]),
 			b: binary.BigEndian.Uint64(ip[8:16]),
@@ -168,14 +182,15 @@ type GeoIPMatcherContainer struct {
 func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
 	if len(geoip.CountryCode) > 0 {
 		for _, m := range c.matchers {
-			if m.countryCode == geoip.CountryCode {
+			if m.countryCode == geoip.CountryCode && m.reverseMatch == geoip.ReverseMatch {
 				return m, nil
 			}
 		}
 	}
 
 	m := &GeoIPMatcher{
-		countryCode: geoip.CountryCode,
+		countryCode:  geoip.CountryCode,
+		reverseMatch: geoip.ReverseMatch,
 	}
 	if err := m.Init(geoip.Cidr); err != nil {
 		return nil, err

app/router/condition_geoip_test.go

@@ -125,6 +125,42 @@ func TestGeoIPMatcher(t *testing.T) {
 	}
 }
 
+func TestGeoIPReverseMatcher(t *testing.T) {
+	cidrList := router.CIDRList{
+		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
+		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
+	}
+	matcher := &router.GeoIPMatcher{}
+	matcher.SetReverseMatch(true) // Reverse match
+	common.Must(matcher.Init(cidrList))
+
+	testCases := []struct {
+		Input  string
+		Output bool
+	}{
+		{
+			Input:  "8.8.8.8",
+			Output: false,
+		},
+		{
+			Input:  "2001:cdba::3257:9652",
+			Output: true,
+		},
+		{
+			Input:  "91.108.255.254",
+			Output: false,
+		},
+	}
+
+	for _, testCase := range testCases {
+		ip := net.ParseAddress(testCase.Input).IP()
+		actual := matcher.Match(ip)
+		if actual != testCase.Output {
+			t.Error("expect input", testCase.Input, "to be", testCase.Output, ", but actually", actual)
+		}
+	}
+}
+
 func TestGeoIPMatcher4CN(t *testing.T) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)

app/router/config.pb.go

@@ -264,8 +264,9 @@ type GeoIP struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	CountryCode string  `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
-	Cidr        []*CIDR `protobuf:"bytes,2,rep,name=cidr,proto3" json:"cidr,omitempty"`
+	CountryCode  string  `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
+	Cidr         []*CIDR `protobuf:"bytes,2,rep,name=cidr,proto3" json:"cidr,omitempty"`
+	ReverseMatch bool    `protobuf:"varint,3,opt,name=reverse_match,json=reverseMatch,proto3" json:"reverse_match,omitempty"`
 }
 
 func (x *GeoIP) Reset() {
@@ -314,6 +315,13 @@ func (x *GeoIP) GetCidr() []*CIDR {
 	return nil
 }
 
+func (x *GeoIP) GetReverseMatch() bool {
+	if x != nil {
+		return x.ReverseMatch
+	}
+	return false
+}
+
 type GeoIPList struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -930,105 +938,108 @@ var file_app_router_config_proto_rawDesc = []byte{
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 }
 
 var (

app/router/config.proto

@@ -54,6 +54,7 @@ message CIDR {
 message GeoIP {
   string country_code = 1;
   repeated CIDR cidr = 2;
+  bool reverse_match = 3;
 }
 
 message GeoIPList {

infra/conf/dns.go

@@ -88,7 +88,7 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		})
 	}
 
-	geoipList, err := toCidrList(c.ExpectIPs)
+	geoipList, err := ToCidrList(c.ExpectIPs)
 	if err != nil {
 		return nil, newError("invalid IP rule: ", c.ExpectIPs).Base(err)
 	}

infra/conf/router.go

@@ -399,21 +399,30 @@ func parseDomainRule(domain string) ([]*router.Domain, error) {
 	return []*router.Domain{domainRule}, nil
 }
 
-func toCidrList(ips StringList) ([]*router.GeoIP, error) {
+func ToCidrList(ips StringList) ([]*router.GeoIP, error) {
 	var geoipList []*router.GeoIP
 	var customCidrs []*router.CIDR
 
 	for _, ip := range ips {
 		if strings.HasPrefix(ip, "geoip:") {
 			country := ip[6:]
+			isReverseMatch := false
+			if strings.HasPrefix(ip, "geoip:!") {
+				country = ip[7:]
+				isReverseMatch = true
+			}
+			if len(country) == 0 {
+				return nil, newError("empty country name in rule")
+			}
 			geoip, err := loadGeoIP(strings.ToUpper(country))
 			if err != nil {
 				return nil, newError("failed to load GeoIP: ", country).Base(err)
 			}
 
 			geoipList = append(geoipList, &router.GeoIP{
-				CountryCode: strings.ToUpper(country),
-				Cidr:        geoip,
+				CountryCode:  strings.ToUpper(country),
+				Cidr:         geoip,
+				ReverseMatch: isReverseMatch,
 			})
 			continue
 		}
@@ -436,14 +445,24 @@ func toCidrList(ips StringList) ([]*router.GeoIP, error) {
 
 			filename := kv[0]
 			country := kv[1]
+			if len(filename) == 0 || len(country) == 0 {
+				return nil, newError("empty filename or empty country in rule")
+			}
+
+			isReverseMatch := false
+			if strings.HasPrefix(country, "!") {
+				country = country[1:]
+				isReverseMatch = true
+			}
 			geoip, err := loadIP(filename, strings.ToUpper(country))
 			if err != nil {
 				return nil, newError("failed to load IPs: ", country, " from ", filename).Base(err)
 			}
 
 			geoipList = append(geoipList, &router.GeoIP{
-				CountryCode: strings.ToUpper(filename + "_" + country),
-				Cidr:        geoip,
+				CountryCode:  strings.ToUpper(filename + "_" + country),
+				Cidr:         geoip,
+				ReverseMatch: isReverseMatch,
 			})
 
 			continue
@@ -525,7 +544,7 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 	}
 
 	if rawFieldRule.IP != nil {
-		geoipList, err := toCidrList(*rawFieldRule.IP)
+		geoipList, err := ToCidrList(*rawFieldRule.IP)
 		if err != nil {
 			return nil, err
 		}
@@ -541,7 +560,7 @@ func parseFieldRule(msg json.RawMessage) (*router.RoutingRule, error) {
 	}
 
 	if rawFieldRule.SourceIP != nil {
-		geoipList, err := toCidrList(*rawFieldRule.SourceIP)
+		geoipList, err := ToCidrList(*rawFieldRule.SourceIP)
 		if err != nil {
 			return nil, err
 		}
@@ -583,21 +602,21 @@ func ParseRule(msg json.RawMessage) (*router.RoutingRule, error) {
 	if err != nil {
 		return nil, newError("invalid router rule").Base(err)
 	}
-	if rawRule.Type == "field" {
+	if strings.EqualFold(rawRule.Type, "field") {
 		fieldrule, err := parseFieldRule(msg)
 		if err != nil {
 			return nil, newError("invalid field rule").Base(err)
 		}
 		return fieldrule, nil
 	}
-	if rawRule.Type == "chinaip" {
+	if strings.EqualFold(rawRule.Type, "chinaip") {
 		chinaiprule, err := parseChinaIPRule(msg)
 		if err != nil {
 			return nil, newError("invalid chinaip rule").Base(err)
 		}
 		return chinaiprule, nil
 	}
-	if rawRule.Type == "chinasites" {
+	if strings.EqualFold(rawRule.Type, "chinasites") {
 		chinasitesrule, err := parseChinaSitesRule(msg)
 		if err != nil {
 			return nil, newError("invalid chinasites rule").Base(err)

infra/conf/router_test.go

@@ -2,15 +2,53 @@ package conf_test
 
 import (
 	"encoding/json"
+	"os"
+	"path/filepath"
 	"testing"
+	_ "unsafe"
 
 	"github.com/golang/protobuf/proto"
 
 	"github.com/xtls/xray-core/app/router"
+	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/platform"
+	"github.com/xtls/xray-core/common/platform/filesystem"
 	. "github.com/xtls/xray-core/infra/conf"
 )
 
+func init() {
+	wd, err := os.Getwd()
+	common.Must(err)
+
+	if _, err := os.Stat(platform.GetAssetLocation("geoip.dat")); err != nil && os.IsNotExist(err) {
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "resources", "geoip.dat")))
+	}
+
+	os.Setenv("xray.location.asset", wd)
+}
+
+func TestToCidrList(t *testing.T) {
+	t.Log(os.Getenv("xray.location.asset"))
+
+	common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoiptestrouter.dat"), "geoip.dat"))
+
+	ips := StringList([]string{
+		"geoip:us",
+		"geoip:cn",
+		"geoip:!cn",
+		"ext:geoiptestrouter.dat:!cn",
+		"ext:geoiptestrouter.dat:ca",
+		"ext-ip:geoiptestrouter.dat:!cn",
+		"ext-ip:geoiptestrouter.dat:!ca",
+	})
+
+	_, err := ToCidrList(ips)
+	if err != nil {
+		t.Fatalf("Failed to parse geoip list, got %s", err)
+	}
+}
+
 func TestRouterConfig(t *testing.T) {
 	createParser := func() func(string) (proto.Message, error) {
 		return func(s string) (proto.Message, error) {