feat: add respect-rules for dns

config/config.go

@@ -212,6 +212,7 @@ type RawDNS struct {
 	IPv6Timeout           uint                                `yaml:"ipv6-timeout" json:"ipv6-timeout"`
 	UseHosts              bool                                `yaml:"use-hosts" json:"use-hosts"`
 	UseSystemHosts        bool                                `yaml:"use-system-hosts" json:"use-system-hosts"`
+	RespectRules          bool                                `yaml:"respect-rules" json:"respect-rules"`
 	NameServer            []string                            `yaml:"nameserver" json:"nameserver"`
 	Fallback              []string                            `yaml:"fallback" json:"fallback"`
 	FallbackFilter        RawFallbackFilter                   `yaml:"fallback-filter" json:"fallback-filter"`
@@ -1039,7 +1040,7 @@ func hostWithDefaultPort(host string, defPort string) (string, error) {
 	return net.JoinHostPort(hostname, port), nil
 }
 
-func parseNameServer(servers []string, preferH3 bool) ([]dns.NameServer, error) {
+func parseNameServer(servers []string, respectRules bool, preferH3 bool) ([]dns.NameServer, error) {
 	var nameservers []dns.NameServer
 
 	for idx, server := range servers {
@@ -1114,6 +1115,10 @@ func parseNameServer(servers []string, preferH3 bool) ([]dns.NameServer, error)
 			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
 		}
 
+		if respectRules && len(proxyName) == 0 {
+			proxyName = dns.RespectRules
+		}
+
 		nameservers = append(
 			nameservers,
 			dns.NameServer{
@@ -1130,7 +1135,7 @@ func parseNameServer(servers []string, preferH3 bool) ([]dns.NameServer, error)
 
 func init() {
 	dns.ParseNameServer = func(servers []string) ([]dns.NameServer, error) { // using by wireguard
-		return parseNameServer(servers, false)
+		return parseNameServer(servers, false, false)
 	}
 }
 
@@ -1156,7 +1161,7 @@ func parsePureDNSServer(server string) string {
 		}
 	}
 }
-func parseNameServerPolicy(nsPolicy *orderedmap.OrderedMap[string, any], ruleProviders map[string]providerTypes.RuleProvider, preferH3 bool) (*orderedmap.OrderedMap[string, []dns.NameServer], error) {
+func parseNameServerPolicy(nsPolicy *orderedmap.OrderedMap[string, any], ruleProviders map[string]providerTypes.RuleProvider, respectRules bool, preferH3 bool) (*orderedmap.OrderedMap[string, []dns.NameServer], error) {
 	policy := orderedmap.New[string, []dns.NameServer]()
 	updatedPolicy := orderedmap.New[string, any]()
 	re := regexp.MustCompile(`[a-zA-Z0-9\-]+\.[a-zA-Z]{2,}(\.[a-zA-Z]{2,})?`)
@@ -1202,7 +1207,7 @@ func parseNameServerPolicy(nsPolicy *orderedmap.OrderedMap[string, any], rulePro
 		if err != nil {
 			return nil, err
 		}
-		nameservers, err := parseNameServer(servers, preferH3)
+		nameservers, err := parseNameServer(servers, respectRules, preferH3)
 		if err != nil {
 			return nil, err
 		}
@@ -1296,6 +1301,10 @@ func parseDNS(rawCfg *RawConfig, hosts *trie.DomainTrie[resolver.HostValue], rul
 		return nil, fmt.Errorf("if DNS configuration is turned on, NameServer cannot be empty")
 	}
 
+	if cfg.RespectRules && len(cfg.ProxyServerNameserver) == 0 {
+		return nil, fmt.Errorf("if “respect-rules” is turned on, “proxy-server-nameserver” cannot be empty")
+	}
+
 	dnsCfg := &DNS{
 		Enable:         cfg.Enable,
 		Listen:         cfg.Listen,
@@ -1310,26 +1319,26 @@ func parseDNS(rawCfg *RawConfig, hosts *trie.DomainTrie[resolver.HostValue], rul
 		},
 	}
 	var err error
-	if dnsCfg.NameServer, err = parseNameServer(cfg.NameServer, cfg.PreferH3); err != nil {
+	if dnsCfg.NameServer, err = parseNameServer(cfg.NameServer, cfg.RespectRules, cfg.PreferH3); err != nil {
 		return nil, err
 	}
 
-	if dnsCfg.Fallback, err = parseNameServer(cfg.Fallback, cfg.PreferH3); err != nil {
+	if dnsCfg.Fallback, err = parseNameServer(cfg.Fallback, cfg.RespectRules, cfg.PreferH3); err != nil {
 		return nil, err
 	}
 
-	if dnsCfg.NameServerPolicy, err = parseNameServerPolicy(cfg.NameServerPolicy, ruleProviders, cfg.PreferH3); err != nil {
+	if dnsCfg.NameServerPolicy, err = parseNameServerPolicy(cfg.NameServerPolicy, ruleProviders, cfg.RespectRules, cfg.PreferH3); err != nil {
 		return nil, err
 	}
 
-	if dnsCfg.ProxyServerNameserver, err = parseNameServer(cfg.ProxyServerNameserver, cfg.PreferH3); err != nil {
+	if dnsCfg.ProxyServerNameserver, err = parseNameServer(cfg.ProxyServerNameserver, false, cfg.PreferH3); err != nil {
 		return nil, err
 	}
 
 	if len(cfg.DefaultNameserver) == 0 {
 		return nil, errors.New("default nameserver should have at least one nameserver")
 	}
-	if dnsCfg.DefaultNameserver, err = parseNameServer(cfg.DefaultNameserver, cfg.PreferH3); err != nil {
+	if dnsCfg.DefaultNameserver, err = parseNameServer(cfg.DefaultNameserver, false, cfg.PreferH3); err != nil {
 		return nil, err
 	}
 	// check default nameserver is pure ip addr

dns/util.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"net"
 	"net/netip"
-	"strconv"
 	"strings"
 	"time"
 
@@ -175,6 +174,8 @@ func msgToDomain(msg *D.Msg) string {
 	return ""
 }
 
+const RespectRules = "RULES"
+
 type dialHandler func(ctx context.Context, network, addr string) (net.Conn, error)
 
 func getDialHandler(r *Resolver, proxyAdapter C.ProxyAdapter, proxyName string, opts ...dialer.Option) dialHandler {
@@ -183,54 +184,67 @@ func getDialHandler(r *Resolver, proxyAdapter C.ProxyAdapter, proxyName string,
 			opts = append(opts, dialer.WithResolver(r))
 			return dialer.DialContext(ctx, network, addr, opts...)
 		} else {
-			host, port, err := net.SplitHostPort(addr)
+			metadata := &C.Metadata{
+				NetWork: C.TCP,
+				Type:    C.INNER,
+			}
+			err := metadata.SetRemoteAddress(addr) // tcp can resolve host by remote
 			if err != nil {
 				return nil, err
 			}
-			uintPort, err := strconv.ParseUint(port, 10, 16)
+			if !strings.Contains(network, "tcp") {
+				metadata.NetWork = C.UDP
+				if !metadata.Resolved() {
+					// udp must resolve host first
+					dstIP, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
 					if err != nil {
 						return nil, err
 					}
+					metadata.DstIP = dstIP
+				}
+			}
+
 			if proxyAdapter == nil {
+				if proxyName == RespectRules {
+					if !metadata.Resolved() {
+						// resolve here before ResolveMetadata to avoid its inner resolver.ResolveIP
+						dstIP, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
+						if err != nil {
+							return nil, err
+						}
+						metadata.DstIP = dstIP
+					}
+					proxyAdapter, _, err = tunnel.ResolveMetadata(metadata)
+					if err != nil {
+						return nil, err
+					}
+				} else {
 					var ok bool
 					proxyAdapter, ok = tunnel.Proxies()[proxyName]
 					if !ok {
 						opts = append(opts, dialer.WithInterface(proxyName))
 					}
 				}
+			}
 
 			if strings.Contains(network, "tcp") {
-				// tcp can resolve host by remote
-				metadata := &C.Metadata{
-					NetWork: C.TCP,
-					Host:    host,
-					DstPort: uint16(uintPort),
-				}
 				if proxyAdapter != nil {
 					if proxyAdapter.IsL3Protocol(metadata) { // L3 proxy should resolve domain before to avoid loopback
-						dstIP, err := resolver.ResolveIPWithResolver(ctx, host, r)
+						if !metadata.Resolved() {
+							dstIP, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
 							if err != nil {
 								return nil, err
 							}
-						metadata.Host = ""
 							metadata.DstIP = dstIP
 						}
+						metadata.Host = "" // clear host to avoid double resolve in proxy
+					}
+					log.Debugln("%s", metadata.RemoteAddress())
 					return proxyAdapter.DialContext(ctx, metadata, opts...)
 				}
 				opts = append(opts, dialer.WithResolver(r))
 				return dialer.DialContext(ctx, network, addr, opts...)
 			} else {
-				// udp must resolve host first
-				dstIP, err := resolver.ResolveIPWithResolver(ctx, host, r)
-				if err != nil {
-					return nil, err
-				}
-				metadata := &C.Metadata{
-					NetWork: C.UDP,
-					Host:    "",
-					DstIP:   dstIP,
-					DstPort: uint16(uintPort),
-				}
 				if proxyAdapter == nil {
 					return dialer.DialContext(ctx, network, addr, opts...)
 				}
@@ -251,33 +265,37 @@ func getDialHandler(r *Resolver, proxyAdapter C.ProxyAdapter, proxyName string,
 }
 
 func listenPacket(ctx context.Context, proxyAdapter C.ProxyAdapter, proxyName string, network string, addr string, r *Resolver, opts ...dialer.Option) (net.PacketConn, error) {
-	host, port, err := net.SplitHostPort(addr)
+	metadata := &C.Metadata{
+		NetWork: C.UDP,
+	}
+	err := metadata.SetRemoteAddress(addr)
 	if err != nil {
 		return nil, err
 	}
-	uintPort, err := strconv.ParseUint(port, 10, 16)
+	if !metadata.Resolved() {
+		// udp must resolve host first
+		dstIP, err := resolver.ResolveIPWithResolver(ctx, metadata.Host, r)
 		if err != nil {
 			return nil, err
 		}
+		metadata.DstIP = dstIP
+	}
+
 	if proxyAdapter == nil {
+		if proxyName == RespectRules {
+			proxyAdapter, _, err = tunnel.ResolveMetadata(metadata)
+			if err != nil {
+				return nil, err
+			}
+		} else {
 			var ok bool
 			proxyAdapter, ok = tunnel.Proxies()[proxyName]
 			if !ok {
 				opts = append(opts, dialer.WithInterface(proxyName))
 			}
 		}
+	}
 
-	// udp must resolve host first
-	dstIP, err := resolver.ResolveIPWithResolver(ctx, host, r)
-	if err != nil {
-		return nil, err
-	}
-	metadata := &C.Metadata{
-		NetWork: C.UDP,
-		Host:    "",
-		DstIP:   dstIP,
-		DstPort: uint16(uintPort),
-	}
 	if proxyAdapter == nil {
 		return dialer.NewDialer(opts...).ListenPacket(ctx, network, "", netip.AddrPortFrom(metadata.DstIP, metadata.DstPort))
 	}

docs/config.yaml

@@ -209,7 +209,7 @@ tunnels: # one line config
 dns:
   cache-algorithm: arc
   enable: false # 关闭将使用系统 DNS
-  prefer-h3: true # 开启 DoH 支持 HTTP/3，将并发尝试
+  prefer-h3: false # 是否开启 DoH 支持 HTTP/3，将并发尝试
   listen: 0.0.0.0:53 # 开启 DNS 服务器监听
   # ipv6: false # false 将返回 AAAA 的空结果
   # ipv6-timeout: 300 # 单位：ms，内部双栈并发时，向上游查询 AAAA 时，等待 AAAA 的时间，默认 100ms
@@ -227,6 +227,13 @@ dns:
 
   # use-hosts: true # 查询 hosts
 
+  # 配置后面的nameserver、fallback和nameserver-policy向dns服务器的连接过程是否遵守遵守rules规则
+  # 如果为false（默认值）则这三部分的dns服务器在未特别指定的情况下会直连
+  # 如果为true，将会按照rules的规则匹配链接方式（走代理或直连），如果有特别指定则任然以指定值为准
+  # 仅当proxy-server-nameserver非空时可以开启此选项, 强烈不建议和prefer-h3一起使用
+  # 此外，这三者配置中的dns服务器如果出现域名会采用default-nameserver配置项解析，也请确保正确配置default-nameserver
+  respect-rules: false
+
   # 配置不使用 fake-ip 的域名
   # fake-ip-filter:
   #   - '*.lan'
@@ -244,6 +251,7 @@ dns:
     - https://mozilla.cloudflare-dns.com/dns-query#DNS&h3=true # 指定策略组和使用 HTTP/3
     - dhcp://en0 # dns from dhcp
     - quic://dns.adguard.com:784 # DNS over QUIC
+    # - '8.8.8.8#RULES' # 效果同respect-rules，但仅对该服务器生效
     # - '8.8.8.8#en0' # 兼容指定 DNS 出口网卡
 
   # 当配置 fallback 时，会查询 nameserver 中返回的 IP 是否为 CN，非必要配置

tunnel/tunnel.go

@@ -278,7 +278,7 @@ func preHandleMetadata(metadata *C.Metadata) error {
 	return nil
 }
 
-func resolveMetadata(metadata *C.Metadata) (proxy C.Proxy, rule C.Rule, err error) {
+func ResolveMetadata(metadata *C.Metadata) (proxy C.Proxy, rule C.Rule, err error) {
 	if metadata.SpecialProxy != "" {
 		var exist bool
 		proxy, exist = proxies[metadata.SpecialProxy]
@@ -375,7 +375,7 @@ func handleUDPConn(packet C.PacketAdapter) {
 			cond.Broadcast()
 		}()
 
-		proxy, rule, err := resolveMetadata(metadata)
+		proxy, rule, err := ResolveMetadata(metadata)
 		if err != nil {
 			log.Warnln("[UDP] Parse metadata failed: %s", err.Error())
 			return
@@ -486,7 +486,7 @@ func handleTCPConn(connCtx C.ConnContext) {
 		}()
 	}
 
-	proxy, rule, err := resolveMetadata(metadata)
+	proxy, rule, err := ResolveMetadata(metadata)
 	if err != nil {
 		log.Warnln("[Metadata] parse failed: %s", err.Error())
 		return