Improve: simple dns prefetch

adapters/direct.go

@@ -31,7 +31,7 @@ type Direct struct {
 }
 
 func (d *Direct) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	c, err := net.Dial("tcp", net.JoinHostPort(addr.Host, addr.Port))
+	c, err := net.Dial("tcp", net.JoinHostPort(addr.String(), addr.Port))
 	if err != nil {
 		return
 	}

adapters/shadowsocks.go

@@ -87,10 +87,10 @@ func serializesSocksAddr(addr *C.Addr) []byte {
 		host := []byte(addr.Host)
 		buf = [][]byte{[]byte{aType, len}, host, port}
 	case socks.AtypIPv4:
-		host := net.ParseIP(addr.Host).To4()
+		host := addr.IP.To4()
 		buf = [][]byte{[]byte{aType}, host, port}
 	case socks.AtypIPv6:
-		host := net.ParseIP(addr.Host).To16()
+		host := addr.IP.To16()
 		buf = [][]byte{[]byte{aType}, host, port}
 	}
 	return bytes.Join(buf, []byte(""))

constant/addr.go

@@ -1,5 +1,9 @@
 package constant
 
+import (
+	"net"
+)
+
 // Socks addr type
 const (
 	AtypIPv4       = 1
@@ -11,5 +15,13 @@ const (
 type Addr struct {
 	AddrType int
 	Host     string
+	IP       *net.IP
 	Port     string
 }
+
+func (addr *Addr) String() string {
+	if addr.Host == "" {
+		return addr.IP.String()
+	}
+	return addr.Host
+}

proxy/http.go

@@ -90,7 +90,7 @@ func (h *HttpAdapter) Addr() *constant.Addr {
 
 func parseHttpAddr(target string) *constant.Addr {
 	host, port, _ := net.SplitHostPort(target)
-
+	ipAddr, _ := net.ResolveIPAddr("ip", host)
 	var addType int
 	ip := net.ParseIP(host)
 	switch {
@@ -105,6 +105,7 @@ func parseHttpAddr(target string) *constant.Addr {
 	return &constant.Addr{
 		AddrType: addType,
 		Host:     host,
+		IP:       &ipAddr.IP,
 		Port:     port,
 	}
 }

proxy/socks.go

@@ -65,22 +65,28 @@ func (s *SocksAdapter) Addr() *constant.Addr {
 
 func parseSocksAddr(target socks.Addr) *constant.Addr {
 	var host, port string
+	var ip net.IP
 
 	switch target[0] {
 	case socks.AtypDomainName:
 		host = string(target[2 : 2+target[1]])
 		port = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
+		ipAddr, err := net.ResolveIPAddr("ip", host)
+		if err == nil {
+			ip = ipAddr.IP
+		}
 	case socks.AtypIPv4:
-		host = net.IP(target[1 : 1+net.IPv4len]).String()
+		ip = net.IP(target[1 : 1+net.IPv4len])
 		port = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
 	case socks.AtypIPv6:
-		host = net.IP(target[1 : 1+net.IPv6len]).String()
+		ip = net.IP(target[1 : 1+net.IPv6len])
 		port = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
 	}
 
 	return &constant.Addr{
 		AddrType: int(target[0]),
 		Host:     host,
+		IP:       &ip,
 		Port:     port,
 	}
 }

rules/geoip.go

@@ -1,8 +1,6 @@
 package rules
 
 import (
-	"net"
-
 	C "github.com/Dreamacro/clash/constant"
 
 	"github.com/oschwald/geoip2-golang"
@@ -29,14 +27,10 @@ func (g *GEOIP) RuleType() C.RuleType {
 }
 
 func (g *GEOIP) IsMatch(addr *C.Addr) bool {
-	if addr.AddrType == C.AtypDomainName {
-		return false
-	}
-	dstIP := net.ParseIP(addr.Host)
-	if dstIP == nil {
+	if addr.IP == nil {
 		return false
 	}
-	record, _ := mmdb.Country(dstIP)
+	record, _ := mmdb.Country(*addr.IP)
 	return record.Country.IsoCode == g.country
 }
 

rules/ipcidr.go

@@ -16,15 +16,11 @@ func (i *IPCIDR) RuleType() C.RuleType {
 }
 
 func (i *IPCIDR) IsMatch(addr *C.Addr) bool {
-	if addr.AddrType == C.AtypDomainName {
-		return false
-	}
-	ip := net.ParseIP(addr.Host)
-	if ip == nil {
+	if addr.IP == nil {
 		return false
 	}
 
-	return i.ipnet.Contains(ip)
+	return i.ipnet.Contains(*addr.IP)
 }
 
 func (g *IPCIDR) Adapter() string {

tunnel/tunnel.go

@@ -117,7 +117,7 @@ func (t *Tunnel) match(addr *C.Addr) C.Proxy {
 			if !ok {
 				continue
 			}
-			t.logCh <- newLog(INFO, "%v match %d using %s", addr.Host, rule.RuleType(), rule.Adapter())
+			t.logCh <- newLog(INFO, "%v match %d using %s", addr.String(), rule.RuleType(), rule.Adapter())
 			return a
 		}
 	}