Fix config not falling back to undeclared handler for missing option

llarp/config/definition.cpp

@@ -37,12 +37,17 @@ namespace llarp
   ConfigDefinition&
   ConfigDefinition::addConfigValue(string_view section, string_view name, string_view value)
   {
+    // see if we have an undeclared handler to fall back to in case section or section:name is
+    // absent
+    auto undItr = m_undeclaredHandlers.find(std::string(section));
+    bool haveUndeclaredHandler = (undItr != m_undeclaredHandlers.end());
+
+    // get section, falling back to undeclared handler if needed
     auto secItr = m_definitions.find(std::string(section));
     if (secItr == m_definitions.end())
     {
       // fallback to undeclared handler if available
-      auto undItr = m_undeclaredHandlers.find(std::string(section));
-      if (undItr == m_undeclaredHandlers.end())
+      if (not haveUndeclaredHandler)
         throw std::invalid_argument(stringify("no declared section [", section, "]"));
       else
       {
@@ -53,10 +58,20 @@ namespace llarp
     }
 
     // section was valid, get definition by name
+    // fall back to undeclared handler if needed
     auto& sectionDefinitions = secItr->second;
     auto defItr = sectionDefinitions.find(std::string(name));
     if (defItr == sectionDefinitions.end())
-      throw std::invalid_argument(stringify("no declared option [", section, "]:", name));
+    {
+      if (not haveUndeclaredHandler)
+        throw std::invalid_argument(stringify("no declared option [", section, "]:", name));
+      else
+      {
+        auto& handler = undItr->second;
+        handler(section, name, value);
+        return *this;
+      }
+    }
 
     OptionDefinition_ptr& definition = defItr->second;
     definition->parseValue(std::string(value));

test/config/test_llarp_config_definition.cpp

@@ -363,3 +363,27 @@ TEST_CASE("ConfigDefinition multiple values", "[config]")
   CHECK(values[1] == 2);
   CHECK(values[2] == 3);
 }
+
+TEST_CASE("ConfigDefinition [bind]iface regression", "[config regression]")
+{
+  llarp::ConfigDefinition config;
+
+  std::string val1;
+  std::string undeclaredName;
+  std::string undeclaredValue;
+
+  config.defineOption<std::string>(
+      "bind", "*", false, false, "1090", [&](std::string arg) { val1 = arg; });
+
+  config.addUndeclaredHandler("bind", [&](string_view, string_view name, string_view value) {
+    undeclaredName = std::string(name);
+    undeclaredValue = std::string(value);
+  });
+
+  config.addConfigValue("bind", "enp35s0", "1091");
+  CHECK_NOTHROW(config.acceptAllOptions());
+
+  CHECK(val1 == "1090");
+  CHECK(undeclaredName == "enp35s0");
+  CHECK(undeclaredValue == "1091");
+}