extcap: Reload values on request

Allow certaing elements to be reloaded upon request. The way
this works is, certain elements can be configured to be reloadable.

By doing so, the extcap is asked once more just for the values
list of this item, together with all already set options, and
reloads the available options depending on the response.

Only supported for selector. Radio and Multiselect will need
additional patches, also moving those parts outside of extcap_argument.cpp
might make sense before hand.

Change-Id: I2e9e3d109b334bf878835a7cc9354f468bc22dee
Reviewed-on: https://code.wireshark.org/review/26223
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Roland Knall <rknall@gmail.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/extcap.c b/extcap.c
index df5c3a726c..a6a34544f2 100644
--- a/extcap.c
+++ b/extcap.c
@@ -807,6 +807,69 @@ extcap_get_if_configuration(const char *ifname)
     return ret;
 }
 
+static gboolean cb_reload_preference(extcap_callback_info_t cb_info)
+{
+    GList *arguments = NULL, * walker = NULL;
+    GList **il = (GList **) cb_info.data;
+
+    arguments = extcap_parse_values(cb_info.output);
+
+    walker = g_list_first((GList *)(arguments));
+    while (walker != NULL)
+    {
+        extcap_value * val = (extcap_value *)walker->data;
+        *il = g_list_append(*il, val);
+        walker = g_list_next(walker);
+    }
+    g_list_free(arguments);
+
+    /* By returning false, extcap_foreach will break on first found */
+    return FALSE;
+}
+
+GList *
+extcap_get_if_configuration_values(const char * ifname, const char * argname, GHashTable *arguments)
+{
+    GList * args = NULL;
+    GList *ret = NULL;
+    gchar **err_str = NULL;
+
+    if (extcap_if_exists(ifname))
+    {
+        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_DEBUG, "Extcap path %s",
+              get_extcap_dir());
+
+        args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_CONFIG) );
+        args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_INTERFACE) );
+        args = g_list_append(args, g_strdup(ifname) );
+        args = g_list_append(args, g_strdup(EXTCAP_ARGUMENT_RELOAD_OPTION) );
+        args = g_list_append(args, g_strdup(argname) );
+
+        if ( arguments )
+        {
+            GList * keys = g_hash_table_get_keys(arguments);
+            while ( keys )
+            {
+                const gchar * key_data = (const gchar *)keys->data;
+                args = g_list_append(args, g_strdup(key_data) );
+                args = g_list_append(args, g_strdup((const gchar *)g_hash_table_lookup(arguments, key_data)) );
+                keys = g_list_next(keys);
+            }
+        }
+
+        extcap_callback_info_t cb_info;
+        cb_info.data = &ret;
+        cb_info.err_str = err_str;
+        cb_info.ifname = ifname;
+
+        extcap_foreach(args, cb_reload_preference, cb_info);
+
+        g_list_free_full(args, g_free);
+    }
+
+    return ret;
+}
+
 /**
  * If is_required is FALSE: returns TRUE if the extcap interface has
  * configurable options.