Include the -config option in the installed service

Untested on Linux and Windows. Fear.

Fixes #304

dnscrypt-proxy/config.go

@@ -6,6 +6,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 	"time"
@@ -134,11 +135,22 @@ type ServerSummary struct {
 	Description string   `json:"description,omitempty"`
 }
 
-func ConfigLoad(proxy *Proxy, svcFlag *string) error {
+func FindConfigFile() (string, error) {
 	configFile := flag.String("config", DefaultConfigFileName, "Path to the configuration file")
 	if _, err := os.Stat(*configFile); os.IsNotExist(err) {
 		cdLocal()
+		if _, err := os.Stat(*configFile); err != nil {
+			return "", err
+		}
 	}
+	pwd, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+	return path.Join(pwd, *configFile), nil
+}
+
+func ConfigLoad(configFile *string, proxy *Proxy, svcFlag *string) error {
 	version := flag.Bool("version", false, "print current proxy version")
 	resolve := flag.String("resolve", "", "resolve a name using system libraries")
 	list := flag.Bool("list", false, "print the list of available resolvers for the enabled filters")

dnscrypt-proxy/main.go

@@ -25,10 +25,18 @@ type App struct {
 
 func main() {
 	dlog.Init("dnscrypt-proxy", dlog.SeverityNotice, "DAEMON")
+
+	var err error
+	configFile, err := FindConfigFile()
+	if err != nil {
+		dlog.Fatalf("Unable to load the configuration file: [%s] -- Maybe use the -config command-line switch?", err)
+	}
+
 	svcConfig := &service.Config{
 		Name:        "dnscrypt-proxy",
 		DisplayName: "DNSCrypt client proxy",
 		Description: "Encrypted/authenticated DNS proxy",
+		Arguments:   []string{"-config", configFile},
 	}
 	svcFlag := flag.String("service", "", fmt.Sprintf("Control the system service: %q", service.ControlAction))
 	app := &App{}
@@ -40,7 +48,7 @@ func main() {
 	app.proxy = NewProxy()
 	app.proxy.xTransport = NewXTransport(30*time.Second, true, false)
 
-	if err := ConfigLoad(&app.proxy, svcFlag); err != nil {
+	if err := ConfigLoad(&configFile, &app.proxy, svcFlag); err != nil {
 		dlog.Fatal(err)
 	}
 	dlog.Noticef("dnscrypt-proxy %s", AppVersion)