Implemented list functionality for secretservice- linux

Signed-off-by: Avi Vaid <avaid1996@gmail.com>

secretservice/secretservice_linux.go

@@ -78,3 +78,26 @@ func (h Secretservice) Get(serverURL string) (string, string, error) {
 	}
 	return user, pass, nil
 }
+
+func (h Secretservice) List() ([]string, []string, error) {
+	var pathsC **C.char
+	defer C.free(unsafe.Pointer(pathsC))
+	var acctsC **C.char
+	defer C.free(unsafe.Pointer(acctsC))
+	var listLenC C.uint
+	err := C.list(&pathsC, &acctsC, &listLenC)
+	if err != nil {
+		defer C.free(unsafe.Pointer(err))
+		return nil, nil, errors.New("Error from list function in secretservice_linux.c likely due to error in secretservice library")
+	}
+	listLen := int(listLenC)
+	pathTmp := (*[1 << 30]*C.char)(unsafe.Pointer(pathsC))[:listLen:listLen]
+	acctTmp := (*[1 << 30]*C.char)(unsafe.Pointer(acctsC))[:listLen:listLen]
+	paths := make([]string, listLen)
+	accts := make([]string, listLen)
+	for i := 0; i < listLen; i++ {
+		paths[i] = C.GoString(pathTmp[i])
+		accts[i] = C.GoString(acctTmp[i])
+	}
+	return paths, accts, nil
+}