Add verification of the .config file parameters

Connman reads the *.config files in STORAGE_DIR during its boot but
it looks only for parameters it is interrested in.
The configuration parameters syntax is complex and it is very
simple to make a mistake without getting connman warnings. This
leads the user to think that connman understands the configuration
file although it doesn't.

This patch is the code that adds warnings to the logs if connman
reads unknown parameters from the *.config files.

1 files changed, 55 insertions, 0 deletions

diff --git a/src/config.c b/src/config.c
index 498c97af..d203935c 100644
--- a/src/config.c
+++ b/src/config.c
@@ -73,6 +73,28 @@ static GHashTable *config_table = NULL;
 #define SERVICE_KEY_PHASE2             "Phase2"
 #define SERVICE_KEY_PASSPHRASE         "Passphrase"
 
+static const char *config_possible_keys[] = {
+	CONFIG_KEY_NAME,
+	CONFIG_KEY_DESC,
+	NULL,
+};
+
+static const char *service_possible_keys[] = {
+	SERVICE_KEY_TYPE,
+	SERVICE_KEY_NAME,
+	SERVICE_KEY_SSID,
+	SERVICE_KEY_EAP,
+	SERVICE_KEY_CA_CERT,
+	SERVICE_KEY_CL_CERT,
+	SERVICE_KEY_PRV_KEY,
+	SERVICE_KEY_PRV_KEY_PASS,
+	SERVICE_KEY_PRV_KEY_PASS_TYPE,
+	SERVICE_KEY_IDENTITY,
+	SERVICE_KEY_PHASE2,
+	SERVICE_KEY_PASSPHRASE,
+	NULL,
+};
+
 static void unregister_config(gpointer data)
 {
 	struct connman_config *config = data;
@@ -109,6 +131,33 @@ static void unregister_service(gpointer data)
 	g_free(service);
 }
 
+static void check_keys(GKeyFile *keyfile, const char *group,
+			const char **possible_keys)
+{
+	char **avail_keys;
+	gsize nb_avail_keys, i, j;
+
+	avail_keys = g_key_file_get_keys(keyfile, group, &nb_avail_keys, NULL);
+	if (avail_keys == NULL)
+		return;
+
+	/*
+	 * For each key in the configuration file,
+	 * verify it is understood by connman
+	 */
+	for (i = 0 ; i < nb_avail_keys; i++) {
+		for (j = 0; possible_keys[j] ; j++)
+			if (g_strcmp0(avail_keys[i], possible_keys[j]) == 0)
+				break;
+
+		if (possible_keys[j] == NULL)
+			connman_warn("Unknown configuration key %s in [%s]",
+					avail_keys[i], group);
+	}
+
+	g_strfreev(avail_keys);
+}
+
 static int load_service(GKeyFile *keyfile, const char *group,
 						struct connman_config *config)
 {
@@ -122,6 +171,9 @@ static int load_service(GKeyFile *keyfile, const char *group,
 	if (strlen(ident) < 1)
 		return -EINVAL;
 
+	/* Verify that provided keys are good */
+	check_keys(keyfile, group, service_possible_keys);
+
 	service = g_hash_table_lookup(config->service_table, ident);
 	if (service == NULL) {
 		service = g_try_new0(struct connman_config_service, 1);
@@ -259,6 +311,9 @@ static int load_config(struct connman_config *config)
 	if (keyfile == NULL)
 		return -EIO;
 
+	/* Verify keys validity of the global section */
+	check_keys(keyfile, "global", config_possible_keys);
+
 	str = g_key_file_get_string(keyfile, "global", CONFIG_KEY_NAME, NULL);
 	if (str != NULL) {
 		g_free(config->name);