Added internet check and warning when offline

launchserver.go

@@ -8,6 +8,9 @@ import (
 )
 
 func startStopServer(cmd string, con UsrConfig) {
+	if hasInternet() != true {
+		fmt.Printf("WARNING!\n\tNot connected to internet, LAN access only\n")
+	}
 	switch cmd {
 	case "start":
 		x := fmt.Sprintf("%s --port %d --server-settings %s --start-server %s", con.Server.ServExec, con.Server.ServPort, con.Server.ServCfg, con.Server.WorldFile)

mods.go

@@ -9,6 +9,8 @@ import (
 )
 
 func downloadMods(c UsrConfig) {
+	if hasInternet() == true {
+
 		//var c = readCfg("config.yml")
 		modlist := string(c.Server.ServDir) + "/mods/mod-list.json"
 
@@ -80,5 +82,7 @@ func downloadMods(c UsrConfig) {
 			}
 
 		}
-
+	} else {
+		fmt.Println("Unable to access internet, please check connection.")
+	}
 }

serv-install.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"archive/tar"
+	"fmt"
 	"io"
 	"log"
 	"net/http"
@@ -13,7 +14,7 @@ import (
 )
 
 func downloadHeadless(c UsrConfig) {
-	//var c = readCfg("config.yml")
+	if hasInternet() == true {
 		headlessQuery := "https://www.factorio.com/get-download/latest/headless/linux64"
 
 		url := headlessQuery
@@ -46,4 +47,7 @@ func downloadHeadless(c UsrConfig) {
 		}
 		// zip does not preserve permissions correctly so i have to do this
 		exec.Command("chmod", "+x", c.Server.ServExec)
+	} else {
+		fmt.Println("Unable to access internet, please check connection.")
+	}
 }

utils.go

@@ -4,10 +4,12 @@ import (
 	"archive/zip"
 	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"os"
 	"path/filepath"
 	"strings"
+	"time"
 )
 
 //Utilities
@@ -91,3 +93,13 @@ func unzip(src, dest string) ([]string, error) {
 
 	return filenames, nil
 }
+
+func hasInternet() bool {
+	timeout := 2 * time.Second
+	conn, err := net.DialTimeout("tcp", "8.8.8.8:53", timeout)
+	if err != nil {
+		return false
+	}
+	conn.Close()
+	return true
+}