Pull request 2089: 6420-ipset-header-data-query

Updates #6420.

Squashed commit of the following:

commit 84a2a457bbb923b53880fc4c08e239696b6bda01
Merge: a578fc29d 0e4e243e8
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Nov 30 16:42:48 2023 +0300

    Merge branch 'master' into 6420-ipset-header-data-query

commit a578fc29d7963d819770c7397c2848f815ad4e07
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Thu Nov 30 15:52:42 2023 +0300

    ipset: imp err msg

commit c4673f7e801887b6264bff97271732645fe78d0d
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Nov 29 16:45:36 2023 +0300

    ipset: imp log msg

commit abf8977f55b1be7b51140cfc9bfb402e40efe7c0
Author: Stanislav Chzhen <s.chzhen@adguard.com>
Date:   Wed Nov 29 15:29:36 2023 +0300

    ipset: header data query

internal/ipset/ipset_linux.go

@@ -101,6 +101,7 @@ func (qc *queryConn) listAll() (sets []props, err error) {
 type ipsetConn interface {
 	Add(name string, entries ...*ipset.Entry) (err error)
 	Close() (err error)
+	Header(name string) (p *ipset.HeaderPolicy, err error)
 	listAll() (sets []props, err error)
 }
 
@@ -112,6 +113,9 @@ type props struct {
 	// name of the ipset.
 	name string
 
+	// typeName of the ipset.
+	typeName string
+
 	// family of the IP addresses in the ipset.
 	family netfilter.ProtoFamily
 
@@ -148,6 +152,8 @@ func (p *props) parseAttribute(a netfilter.Attribute) {
 	case ipset.AttrSetName:
 		// Trim the null character.
 		p.name = string(bytes.Trim(a.Data, "\x00"))
+	case ipset.AttrTypeName:
+		p.typeName = string(bytes.Trim(a.Data, "\x00"))
 	case ipset.AttrFamily:
 		p.family = netfilter.ProtoFamily(a.Data[0])
 	default:
@@ -288,6 +294,34 @@ func (m *manager) parseIpsetConfig(ipsetConf []string) (err error) {
 	return nil
 }
 
+// ipsetProps returns the properties of an ipset with the given name.
+//
+// Additional header data query.  See https://github.com/AdguardTeam/AdGuardHome/issues/6420.
+func (m *manager) ipsetProps(p props) (err error) {
+	// The family doesn't seem to matter when we use a header query, so
+	// query only the IPv4 one.
+	//
+	// TODO(a.garipov): Find out if this is a bug or a feature.
+	var res *ipset.HeaderPolicy
+	res, err = m.ipv4Conn.Header(p.name)
+	if err != nil {
+		return err
+	}
+
+	if res == nil || res.Family == nil {
+		return errors.Error("empty response or no family data")
+	}
+
+	family := netfilter.ProtoFamily(res.Family.Value)
+	if family != netfilter.ProtoIPv4 && family != netfilter.ProtoIPv6 {
+		return fmt.Errorf("unexpected ipset family %q", family)
+	}
+
+	p.family = family
+
+	return nil
+}
+
 // ipsets returns currently known ipsets.
 func (m *manager) ipsets(names []string) (sets []props, err error) {
 	for _, n := range names {
@@ -297,7 +331,16 @@ func (m *manager) ipsets(names []string) (sets []props, err error) {
 		}
 
 		if p.family != netfilter.ProtoIPv4 && p.family != netfilter.ProtoIPv6 {
-			return nil, fmt.Errorf("%q unexpected ipset family %q", p.name, p.family)
+			log.Debug("ipset: getting properties: %q %q unexpected ipset family %q",
+				p.name,
+				p.typeName,
+				p.family,
+			)
+
+			err = m.ipsetProps(p)
+			if err != nil {
+				return nil, fmt.Errorf("%q %q making header query: %w", p.name, p.typeName, err)
+			}
 		}
 
 		sets = append(sets, p)
@@ -340,6 +383,8 @@ func newManagerWithDialer(ipsetConf []string, dial dialer) (mgr Manager, err err
 		return nil, fmt.Errorf("getting ipsets: %w", err)
 	}
 
+	log.Debug("ipset: initialized")
+
 	return m, nil
 }
 
@@ -408,7 +453,7 @@ func (m *manager) addIPs(host string, set props, ips []net.IP) (n int, err error
 
 	err = conn.Add(set.name, entries...)
 	if err != nil {
-		return 0, fmt.Errorf("adding %q%s to ipset %q: %w", host, ips, set.name, err)
+		return 0, fmt.Errorf("adding %q%s to %q %q: %w", host, ips, set.name, set.typeName, err)
 	}
 
 	// Only add these to the cache once we're sure that all of them were
@@ -444,10 +489,10 @@ func (m *manager) addToSets(
 				return n, err
 			}
 		default:
-			return n, fmt.Errorf("unexpected family %s for ipset %q", set.family, set.name)
+			return n, fmt.Errorf("%q %q unexpected family %q", set.name, set.typeName, set.family)
 		}
 
-		log.Debug("ipset: added %d ips to set %s", nn, set.name)
+		log.Debug("ipset: added %d ips to set %q %q", nn, set.name, set.typeName)
 
 		n += nn
 	}

internal/ipset/ipset_linux_internal_test.go

@@ -47,6 +47,11 @@ func (c *fakeConn) Close() (err error) {
 	return nil
 }
 
+// Header implements the [ipsetConn] interface for *fakeConn.
+func (c *fakeConn) Header(_ string) (_ *ipset.HeaderPolicy, _ error) {
+	return nil, nil
+}
+
 // listAll implements the [ipsetConn] interface for *fakeConn.
 func (c *fakeConn) listAll() (sets []props, err error) {
 	return c.sets, nil