add nic check

config.default.yml

@@ -1,3 +1,4 @@
+interface: eth0
 domains:
   - name: domain.name
     subdomain:

main.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"log"
+	"net"
 	"net/http"
 	"regexp"
 	"time"
@@ -42,6 +43,25 @@ func main() {
 	newR53()
 	config = setting.LoadConfig(confpath)
 	fmt.Println(config)
+
+	// wait nic
+	for {
+		nics, err := net.Interfaces()
+		if err != nil {
+			log.Fatal(err)
+		}
+		nicFlag := false
+		for _, v := range nics {
+			if v.Name == config.NIC {
+				nicFlag = true
+			}
+		}
+		if nicFlag == true {
+			break
+		}
+		time.Sleep(time.Second * 5)
+	}
+
 	ip = getMyIP()
 	if ok, err := checkIP(ip); err != nil || !ok {
 		println("ip check fail")

modules/setting.go

@@ -11,6 +11,7 @@ import (
 )
 
 type Config struct {
+	NIC     string `yaml:"interface"`
 	Domains []struct {
 		Name string   `yaml:"name"`
 		Sub  []string `yaml:"subdomain,flow"`