feat: -c argument to load the config from another path

cmd/simple-ddns-client/main.go

@@ -21,6 +21,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"flag"
 	"io"
 	"log"
 	"net"
@@ -67,6 +68,11 @@ var resolver = &net.Resolver{
 		d := net.Dialer{
 			Timeout: time.Millisecond * time.Duration(5000),
 		}
+		if config.DnsServer == "" {
+			// TODO: This is called two times. idk why
+			log.Print("\"dnsServer\" key is empty. Using default DNS server")
+			return d.DialContext(ctx, network, address)
+		}
 		return d.DialContext(ctx, network, config.DnsServer)
 	},
 }
@@ -83,7 +89,7 @@ func (p *Porkbun) updateIp() {
 		log.Print("Failed to retrieve IP address for domain " + p.Domain)
 	}
 
-	log.Print("Current IP of the record " + p.Domain + "is " + dnsIp[0])
+	log.Print("Current IP of the record " + p.Domain + " is " + dnsIp[0])
 
 	p.Data.Ip = getIpAddress()
 
@@ -172,7 +178,12 @@ func doPostRequest(url string, data []byte) []byte {
 
 func init() {
 	client = &http.Client{}
-	config = loadConfig("/etc/simple-ddns-client/config.json")
+	var configPath string
+
+	flag.StringVar(&configPath, "c", "/etc/simple-ddns-client/config.json", "config.json path")
+	flag.Parse()
+
+	config = loadConfig(configPath)
 }
 
 func main() {