feat: add IP-ASN rule

rules/common/geoip.go

@@ -52,7 +52,7 @@ func (g *GEOIP) Match(metadata *C.Metadata) (bool, string) {
 		if metadata.DstGeoIP != nil {
 			return false, g.adapter
 		}
-		metadata.DstGeoIP = mmdb.Instance().LookupCode(ip.AsSlice())
+		metadata.DstGeoIP = mmdb.IPInstance().LookupCode(ip.AsSlice())
 		for _, code := range metadata.DstGeoIP {
 			if g.country == code {
 				return true, g.adapter

rules/common/ipasn.go

@@ -0,0 +1,67 @@
+package common
+
+import (
+	"strconv"
+
+	"github.com/metacubex/mihomo/component/geodata"
+	"github.com/metacubex/mihomo/component/mmdb"
+	C "github.com/metacubex/mihomo/constant"
+	"github.com/metacubex/mihomo/log"
+)
+
+type ASN struct {
+	*Base
+	asn         string
+	adapter     string
+	noResolveIP bool
+}
+
+func (a *ASN) Match(metadata *C.Metadata) (bool, string) {
+	ip := metadata.DstIP
+	if !ip.IsValid() {
+		return false, ""
+	}
+
+	result := mmdb.ASNInstance().LookupASN(ip.AsSlice())
+
+	asnNumber := strconv.FormatUint(uint64(result.AutonomousSystemNumber), 10)
+	metadata.DstIPASN = asnNumber + " " + result.AutonomousSystemOrganization
+
+	match := a.asn == asnNumber
+	return match, a.adapter
+}
+
+func (a *ASN) RuleType() C.RuleType {
+	return C.IPASN
+}
+
+func (a *ASN) Adapter() string {
+	return a.adapter
+}
+
+func (a *ASN) Payload() string {
+	return a.asn
+}
+
+func (a *ASN) ShouldResolveIP() bool {
+	return !a.noResolveIP
+}
+
+func (a *ASN) GetASN() string {
+	return a.asn
+}
+
+func NewIPASN(asn string, adapter string, noResolveIP bool) (*ASN, error) {
+	C.ASNEnable = true
+	if err := geodata.InitASN(); err != nil {
+		log.Errorln("can't initial ASN: %s", err)
+		return nil, err
+	}
+
+	return &ASN{
+		Base:        &Base{},
+		asn:         asn,
+		adapter:     adapter,
+		noResolveIP: noResolveIP,
+	}, nil
+}