Feat: add reverse match for GeoIP

common/matcher/geoip/conf.go

@@ -99,6 +99,7 @@ func ParaseIPList(ips []string) ([]*GeoIP, error) {
 	for _, ip := range ips {
 		if strings.HasPrefix(ip, "geoip:") {
 			country := ip[6:]
+			isReverseMatch := false
 			geoipc, err := LoadGeoIP(strings.ToUpper(country))
 			if err != nil {
 				return nil, newError("failed to load GeoIP: ", country).Base(err)
@@ -107,6 +108,7 @@ func ParaseIPList(ips []string) ([]*GeoIP, error) {
 			geoipList = append(geoipList, &GeoIP{
 				CountryCode:  strings.ToUpper(country),
 				Cidr:         geoipc,
+				ReverseMatch: isReverseMatch,
 			})
 			continue
 		}
@@ -129,6 +131,15 @@ func ParaseIPList(ips []string) ([]*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
+			}
 			geoipc, err := LoadIPFile(filename, strings.ToUpper(country))
 			if err != nil {
 				return nil, newError("failed to load IPs: ", country, " from ", filename).Base(err)
@@ -137,6 +148,7 @@ func ParaseIPList(ips []string) ([]*GeoIP, error) {
 			geoipList = append(geoipList, &GeoIP{
 				CountryCode:  strings.ToUpper(filename + "_" + country),
 				Cidr:         geoipc,
+				ReverseMatch: isReverseMatch,
 			})
 
 			continue

common/matcher/geoip/geoip.go

@@ -16,12 +16,17 @@ type ipv6 struct {
 
 type GeoIPMatcher struct {
 	countryCode  string
+	reverseMatch bool
 	ip4          []uint32
 	prefix4      []uint8
 	ip6          []ipv6
 	prefix6      []uint8
 }
 
+func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
+	m.reverseMatch = isReverseMatch
+}
+
 func normalize4(ip uint32, prefix uint8) uint32 {
 	return (ip >> (32 - prefix)) << (32 - prefix)
 }
@@ -149,8 +154,17 @@ 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]),
@@ -170,7 +184,7 @@ 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
 			}
 		}
@@ -178,6 +192,7 @@ func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
 
 	m := &GeoIPMatcher{
 		countryCode:  geoip.CountryCode,
+		reverseMatch: geoip.ReverseMatch,
 	}
 	if err := m.Init(geoip.Cidr); err != nil {
 		return nil, err

common/matcher/geoip/geoip.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.15.6
+// 	protoc        v3.15.7
 // source: common/matcher/geoip/geoip.proto
 
 package geoip
@@ -90,6 +90,7 @@ type GeoIP struct {
 
 	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() {
@@ -138,6 +139,13 @@ 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
@@ -194,25 +202,27 @@ var file_common_matcher_geoip_geoip_proto_rawDesc = []byte{
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 }
 
 var (

common/matcher/geoip/geoip.proto

@@ -18,6 +18,7 @@ message CIDR {
 message GeoIP {
   string country_code = 1;
   repeated CIDR cidr = 2;
+  bool reverse_match =3;
 }
 
 message GeoIPList {

common/matcher/geoip/geoip_test.go

@@ -135,6 +135,42 @@ func TestGeoIPMatcher4CN(t *testing.T) {
 	}
 }
 
+func TestGeoIPReverseMatcher(t *testing.T) {
+	cidrList := CIDRList{
+		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
+		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
+	}
+	matcher := &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 TestGeoIPMatcher6US(t *testing.T) {
 	ips, err := loadGeoIP("US")
 	common.Must(err)