general: use builtin dns as resolver when dns enabled

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v1
         with:
           go-version: 1.15.x
       - name: Test
@@ -24,7 +24,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v1
         with:
           go-version: 1.15.x
       - name: Build

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v1
         with:
           go-version: 1.15.x
       - name: Run GoReleaser

config/examples/8.transparent_proxy_with_dnsmasq/README.md

@@ -17,7 +17,7 @@ checkinterval=30
 
 #### Create a ipset manually
 ```bash
-ipset create myset hash:ip
+ipset create myset hash:net
 ```
 
 #### Config dnsmasq

go.mod

@@ -9,8 +9,9 @@ require (
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/xtaci/kcp-go/v5 v5.5.15
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
-	golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a // indirect
+	golang.org/x/net v0.0.0-20200904194848-62affa334b73 // indirect
-	golang.org/x/tools v0.0.0-20200902151623-5b9ef244dc36 // indirect
+	golang.org/x/sys v0.0.0-20200909081042-eff7692f9009 // indirect
+	golang.org/x/tools v0.0.0-20200913032122-97363e29fc9b // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 )
 

go.sum

@@ -104,6 +104,8 @@ golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgN
 golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20200822124328-c89045814202 h1:VvcQYSHwXgi7W+TpUR6A9g6Up98WAHf3f/ulnJ62IyA=
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20200904194848-62affa334b73 h1:MXfv8rhZWmFeqX3GNZRsd6vOLoaCHjYEX3qkRo3YBUA=
+golang.org/x/net v0.0.0-20200904194848-62affa334b73/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -118,15 +120,15 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200501145240-bc7a7d42d5c3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200808120158-1030fc2bf1d9 h1:yi1hN8dcqI9l8klZfy4B8mJvFmmAxJEePIQQFNSd7Cs=
 golang.org/x/sys v0.0.0-20200808120158-1030fc2bf1d9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a h1:i47hUS795cOydZI4AwJQCKXOr4BvxzvikwDoDtHhP2Y=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009 h1:W0lCpv29Hv0UaM1LXb9QlBHLNP8UFfcKjblhVCWftOM=
-golang.org/x/sys v0.0.0-20200831180312-196b9ba8737a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200909081042-eff7692f9009/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c h1:iHhCR0b26amDCiiO+kBguKZom9aMF+NrFxh9zeKR/XU=
 golang.org/x/tools v0.0.0-20200425043458-8463f397d07c/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
 golang.org/x/tools v0.0.0-20200808161706-5bf02b21f123/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
-golang.org/x/tools v0.0.0-20200902151623-5b9ef244dc36 h1:0C2pK23jzHryVdIUZ/n6UAuSISdaXMsrwdDQCVW6TRA=
+golang.org/x/tools v0.0.0-20200913032122-97363e29fc9b h1:3/5GThpuWHBq2GFcurHBWuWlzdbln+Er+cyzGqQAPOs=
-golang.org/x/tools v0.0.0-20200902151623-5b9ef244dc36/go.mod h1:Cj7w3i3Rnn0Xh82ur9kSqwfTHTeVxaDqrfMjpcNT6bE=
+golang.org/x/tools v0.0.0-20200913032122-97363e29fc9b/go.mod h1:Cj7w3i3Rnn0Xh82ur9kSqwfTHTeVxaDqrfMjpcNT6bE=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=

main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	stdlog "log"
+	"net"
 	"os"
 	"os/signal"
 	"syscall"
@@ -76,6 +78,12 @@ func main() {
 		}
 
 		d.Start()
+
+		net.DefaultResolver.PreferGo = true
+		net.DefaultResolver.Dial = func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{}
+			return d.DialContext(ctx, "udp", conf.DNS)
+		}
 	}
 
 	// enable checkers

systemd/README.md

@@ -20,15 +20,15 @@ cp systemd/glider@.service /etc/systemd/system/
 ```bash
 # copy config file to /etc/glider/
 mkdir /etc/glider/
-cp ./config/glider.conf.example /etc/glider/server.conf
+cp ./config/glider.conf.example /etc/glider/glider.conf
 ```
 
 #### 4. enable and start service: glider@***server***
 
 ```bash
 # enable and start service
-systemctl enable glider@server
+systemctl enable glider@glider
-systemctl start glider@server
+systemctl start glider@glider
 ```
 
 See [glider@.service](glider%40.service)