Feature: support IPSET rule (#2693)

rule/ipset.go

@@ -0,0 +1,54 @@
+package rules
+
+import (
+	"github.com/Dreamacro/clash/component/ipset"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/log"
+)
+
+type IPSet struct {
+	name        string
+	adapter     string
+	noResolveIP bool
+}
+
+func (f *IPSet) RuleType() C.RuleType {
+	return C.IPSet
+}
+
+func (f *IPSet) Match(metadata *C.Metadata) bool {
+	exist, err := ipset.Test(f.name, metadata.DstIP)
+	if err != nil {
+		log.Warnln("check ipset '%s' failed: %s", f.name, err.Error())
+		return false
+	}
+	return exist
+}
+
+func (f *IPSet) Adapter() string {
+	return f.adapter
+}
+
+func (f *IPSet) Payload() string {
+	return f.name
+}
+
+func (f *IPSet) ShouldResolveIP() bool {
+	return !f.noResolveIP
+}
+
+func (f *IPSet) ShouldFindProcess() bool {
+	return false
+}
+
+func NewIPSet(name string, adapter string, noResolveIP bool) (*IPSet, error) {
+	if err := ipset.Verify(name); err != nil {
+		return nil, err
+	}
+
+	return &IPSet{
+		name:        name,
+		adapter:     adapter,
+		noResolveIP: noResolveIP,
+	}, nil
+}