Implement serving passphrase from daemon

daemon/2server.go

@@ -2,12 +2,12 @@ package daemon
 
 import (
 	"crypto/sha256"
-	"errors"
 	"io"
 	"os"
 )
 
 var daemonHash []byte
+var passphrase string
 
 // RCWService provides an RPC method.
 type RCWService struct{}
@@ -15,12 +15,9 @@ type RCWService struct{}
 // GetPass is the RPC method.
 // For now (as a test/example), it returns "hello" if the input is "hi".
 func (h *RCWService) GetPass(request string, reply *string) error {
-	if request == "hi" {
+	*reply = passphrase
-		*reply = "hello"
 	return nil
 }
-	return errors.New("unexpected input, expected \"hi\"")
-}
 
 // getFileHash returns the SHA256 hash of the file at the given path.
 func getFileHash(path string) []byte {

daemon/2serverUNIXGeneric.go

@@ -15,7 +15,15 @@ import (
 )
 
 // Run should be called to start an RPC server.
-func Run() {
+func Start(inputPassphrase string) {
+	// ensure daemon is not already running
+	if daemonIsOpen() {
+		return
+	}
+
+	// store passphrase to be referenced by GetPass method
+	passphrase = inputPassphrase
+
 	// register RCWService with the RPC package
 	if err := rpc.Register(&RCWService{}); err != nil {
 		log.Fatalf("Error registering RPC service: %v", err)

daemon/2serverWindows.go

@@ -20,7 +20,15 @@ const (
 )
 
 // Run should be called to start an RPC server using Windows named pipes
-func Run() {
+func Start(inputPassphrase string) {
+	// ensure daemon is not already running
+	if daemonIsOpen() {
+		return
+	}
+
+	// store passphrase to be referenced by GetPass method
+	passphrase = inputPassphrase
+
 	// register RCWService with the RPC package
 	if err := rpc.Register(&RCWService{}); err != nil {
 		log.Fatalf("Error registering RPC service: %v", err)

daemon/3client.go

@@ -0,0 +1,12 @@
+package daemon
+
+import "os"
+
+func daemonIsOpen() bool {
+	// check if socketPath exists and is a file
+	fileInfo, err := os.Stat(socketPath)
+	if err != nil {
+		return false
+	}
+	return !fileInfo.IsDir()
+}

example.go

@@ -8,13 +8,8 @@ import (
 
 func main() {
 	if len(os.Args) > 1 {
-		switch os.Args[1] {
+		daemon.Start(os.Args[1])
-		case "client":
-			fmt.Println("RPC Reply: " + daemon.Call())
-		default:
-			daemon.Run()
-		}
 	} else {
-		daemon.Run()
+		fmt.Println(daemon.Call())
 	}
 }