[PATCH v4 4/5] client: display BasicServiceSet RSN property

[Aleksman4o <aleksman4o@gmail.com>]

From: Aleks Man <aleksman4o@gmail.com>

Parse the optional RSN dictionary and include the advertised key
management and cipher capabilities in the station get-bsses output.
---
 client/bss.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/client/bss.c b/client/bss.c
index def4de7f..b5c80087 100644
--- a/client/bss.c
+++ b/client/bss.c
@@ -32,6 +32,7 @@
 
 struct bss {
 	char *address;
+	char *rsn;
 };
 
 static const char *get_address(const void *data)
@@ -57,8 +58,82 @@ static void update_address(void *data, struct l_dbus_message_iter *variant)
 	bss->address = l_strdup(value);
 }
 
+static char *string_array_to_string(struct l_dbus_message_iter *variant)
+{
+	struct l_dbus_message_iter array;
+	const char *value;
+	char **strv;
+	char *result;
+
+	if (!l_dbus_message_iter_get_variant(variant, "as", &array))
+		return NULL;
+
+	strv = l_strv_new();
+
+	while (l_dbus_message_iter_next_entry(&array, &value))
+		strv = l_strv_append(strv, value);
+
+	result = l_strjoinv(strv, ' ');
+	l_strv_free(strv);
+
+	return result;
+}
+
+static void update_rsn(void *data, struct l_dbus_message_iter *variant)
+{
+	struct bss *bss = data;
+	struct l_dbus_message_iter dict;
+	struct l_dbus_message_iter value;
+	const char *key;
+	const char *group_value;
+	char *key_mgmt = NULL;
+	char *pairwise = NULL;
+	char *group = NULL;
+
+	l_free(bss->rsn);
+	bss->rsn = NULL;
+
+	if (!variant ||
+			!l_dbus_message_iter_get_variant(variant, "a{sv}", &dict))
+		goto done;
+
+	while (l_dbus_message_iter_next_entry(&dict, &key, &value)) {
+		if (!strcmp(key, "KeyMgmt")) {
+			l_free(key_mgmt);
+			key_mgmt = string_array_to_string(&value);
+		} else if (!strcmp(key, "Pairwise")) {
+			l_free(pairwise);
+			pairwise = string_array_to_string(&value);
+		} else if (!strcmp(key, "Group") &&
+				l_dbus_message_iter_get_variant(&value, "s",
+								&group_value)) {
+			l_free(group);
+			group = l_strdup(group_value);
+		}
+	}
+
+	if (!key_mgmt || !pairwise || !group)
+		goto done;
+
+	bss->rsn = l_strdup_printf("KeyMgmt: %s; Pairwise: %s; Group: %s",
+					key_mgmt, pairwise, group);
+
+done:
+	l_free(key_mgmt);
+	l_free(pairwise);
+	l_free(group);
+}
+
+static const char *get_rsn(const void *data)
+{
+	const struct bss *bss = data;
+
+	return bss->rsn;
+}
+
 static const struct proxy_interface_property bss_properties[] = {
 	{ "Address",       "s", update_address, get_address },
+	{ "RSN",           "a{sv}", update_rsn, get_rsn },
 	{ }
 };
 
@@ -72,6 +147,7 @@ static void bss_destroy(void *data)
 	struct bss *bss = data;
 
 	l_free(bss->address);
+	l_free(bss->rsn);
 	l_free(bss);
 }
 
-- 
2.55.0