refactor: optimize hash table iterations and fix security issues #58

- refactor(core): replace g_hash_table_get_keys with g_hash_table_iter_init
  * Eliminates temporary GList allocations
  * Improves iteration performance
  * Affected: connection.c, cmd_defs.c, cmd_funcs.c, omemo.c, gpg.c,
    disco.c, form.c, autocompleters.c, capabilities.c, callbacks.c

- fix(xmpp): correct queued_messages loop in connection.c:1031
  * Remove incorrect NULL check that prevented message storage
  * calloc zeros array, causing loop to skip immediately
  * Fixes dropped messages during reconnection with SM enabled

- fix(ui): prevent format string vulnerabilities in cons_show calls
  * Replace cons_show(variable) with cons_show("%s", variable)
  * Protects against format string attacks if variables contain %
  * Updated instances across cmd_funcs.c, connection.c, ox.c,
    console.c, core.c

src/xmpp/capabilities.c

@@ -171,16 +171,15 @@ caps_get_features(void)
 {
     GList* result = NULL;
 
-    GList* features_as_list = g_hash_table_get_keys(prof_features);
-    GList* curr = features_as_list;
-    while (curr) {
-        result = g_list_append(result, strdup(curr->data));
-        curr = g_list_next(curr);
+    GHashTableIter iter;
+    gpointer key, value;
+    g_hash_table_iter_init(&iter, prof_features);
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+        result = g_list_append(result, strdup((char*)key));
     }
-    g_list_free(features_as_list);
 
     GList* plugin_features = plugins_get_disco_features();
-    curr = plugin_features;
+    GList* curr = plugin_features;
     while (curr) {
         result = g_list_append(result, strdup(curr->data));
         curr = g_list_next(curr);

src/xmpp/connection.c

@@ -148,7 +148,7 @@ connection_init(void)
     if (string_to_verbosity(v, &verbosity, &err_msg)) {
         xmpp_ctx_set_verbosity(conn.xmpp_ctx, verbosity);
     } else {
-        cons_show(err_msg);
+        cons_show("%s", err_msg);
     }
     conn.xmpp_conn = xmpp_conn_new(conn.xmpp_ctx);
 
@@ -638,22 +638,18 @@ gboolean
 connection_supports(const char* const feature)
 {
     gboolean ret = FALSE;
-    GList* jids = g_hash_table_get_keys(conn.features_by_jid);
+    GHashTableIter iter;
+    gpointer key, value;
 
-    GList* curr = jids;
-    while (curr) {
-        char* jid = curr->data;
-        GHashTable* features = g_hash_table_lookup(conn.features_by_jid, jid);
+    g_hash_table_iter_init(&iter, conn.features_by_jid);
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+        GHashTable* features = (GHashTable*)value;
         if (features && g_hash_table_lookup(features, feature)) {
             ret = TRUE;
             break;
         }
-
-        curr = g_list_next(curr);
     }
 
-    g_list_free(jids);
-
     return ret;
 }
 
@@ -664,22 +660,17 @@ connection_jid_for_feature(const char* const feature)
         return NULL;
     }
 
-    GList* jids = g_hash_table_get_keys(conn.features_by_jid);
+    GHashTableIter iter;
+    gpointer key, value;
 
-    GList* curr = jids;
-    while (curr) {
-        char* jid = curr->data;
-        GHashTable* features = g_hash_table_lookup(conn.features_by_jid, jid);
+    g_hash_table_iter_init(&iter, conn.features_by_jid);
+    while (g_hash_table_iter_next(&iter, &key, &value)) {
+        GHashTable* features = (GHashTable*)value;
         if (features && g_hash_table_lookup(features, feature)) {
-            g_list_free(jids);
-            return jid;
+            return (const char*)key;
         }
-
-        curr = g_list_next(curr);
     }
 
-    g_list_free(jids);
-
     return NULL;
 }
 
@@ -1034,7 +1025,7 @@ _connection_handler(xmpp_conn_t* const xmpp_conn, const xmpp_conn_event_t status
                 conn.sm_state = xmpp_conn_get_sm_state(conn.xmpp_conn);
                 if (send_queue_len > 0 && prefs_get_boolean(PREF_STROPHE_SM_RESEND)) {
                     conn.queued_messages = calloc(send_queue_len + 1, sizeof(*conn.queued_messages));
-                    for (int n = 0; n < send_queue_len && conn.queued_messages[n]; ++n) {
+                    for (int n = 0; n < send_queue_len; ++n) {
                         conn.queued_messages[n] = xmpp_conn_send_queue_drop_element(conn.xmpp_conn, XMPP_QUEUE_OLDEST);
                     }
                 } else if (send_queue_len > 0) {
@@ -1189,12 +1180,13 @@ connection_debug_print_features()
             continue;
         }
 
-        GList* feature_keys = g_hash_table_get_keys(features);
-        for (GList* l = feature_keys; l != NULL; l = l->next) {
-            const char* feature = (const char*)l->data;
+        GHashTableIter feature_iter;
+        gpointer feature_key, feature_value;
+        g_hash_table_iter_init(&feature_iter, features);
+        while (g_hash_table_iter_next(&feature_iter, &feature_key, &feature_value)) {
+            const char* feature = (const char*)feature_key;
             log_debug("%s:\t%s", jid, feature);
         }
-        g_list_free(feature_keys);
     }
 
     log_debug("=== End of Features ===");

src/xmpp/form.c

@@ -437,18 +437,7 @@ form_get_form_type_field(DataForm* form)
 gboolean
 form_tag_exists(DataForm* form, const char* const tag)
 {
-    GList* tags = g_hash_table_get_keys(form->tag_to_var);
-    GList* curr = tags;
-    while (curr) {
-        if (g_strcmp0(curr->data, tag) == 0) {
-            g_list_free(tags);
-            return TRUE;
-        }
-        curr = g_list_next(curr);
-    }
-
-    g_list_free(tags);
-    return FALSE;
+    return g_hash_table_contains(form->tag_to_var, tag);
 }
 
 form_field_type_t

src/xmpp/ox.c

@@ -326,7 +326,7 @@ _ox_metadata_result(xmpp_stanza_t* const stanza, void* const userdata)
 
         if (fingerprint) {
             if (strlen(fingerprint) == KEYID_LENGTH) {
-                cons_show(fingerprint);
+                cons_show("%s", fingerprint);
             } else {
                 cons_show("OX: Wrong char size of public key");
                 log_error("[OX] Wrong chat size of public key %s", fingerprint);