Show a warning when there are zero listen { } blocks with SSL:

[warning] Your server is not listening on any SSL ports. It is recommended to listen on port 6697.
[warning] Consider adding this to your unrealircd.conf: listen { ip *; port 6697; options { ssl; }; };

src/s_conf.c

@@ -258,6 +258,8 @@ int charsys_postconftest(void);
void charsys_finish(void);
int reloadable_perm_module_unloaded(void);

int ssl_tests(void);

/* Conf sub-sub-functions */
void test_sslblock(ConfigFile *conf, ConfigEntry *cep, int *totalerrors);
void conf_sslblock(ConfigFile *conf, ConfigEntry *cep, SSLOptions *ssloptions);
@@ -312,6 +314,7 @@ MODVAR int			config_error_flag = 0;
int			config_verbose = 0;

MODVAR int need_34_upgrade = 0;
int have_ssl_listeners = 0;

void add_include(const char *filename, const char *included_from, int included_from_line);
#ifdef USE_LIBCURL
@@ -1606,6 +1609,24 @@ void upgrade_conf_to_34(void)
	/* TODO: win32 may require a different error */
}

/** Reset config tests (before running the config test) */
void config_test_reset(void)
{
	charsys_reset_pretest();
}

/** Run config test and all post config tests. */
int config_test_all(void)
{
	if ((config_test() < 0) || (callbacks_check() < 0) || (efunctions_check() < 0) ||
	    (charsys_postconftest() < 0) || ssl_used_in_config_but_unavail() ||
	    reloadable_perm_module_unloaded() || !ssl_tests())
	{
		return 0;
	}
	return 1;
}

int	init_conf(char *rootconf, int rehash)
{
	char *old_pid_file = NULL;
@@ -1631,9 +1652,8 @@ int	init_conf(char *rootconf, int rehash)
	add_include(rootconf, "[thin air]", -1);
	if (load_conf(rootconf, rootconf) > 0)
	{
		charsys_reset_pretest();
		if ((config_test() < 0) || (callbacks_check() < 0) || (efunctions_check() < 0) ||
		    (charsys_postconftest() < 0) || ssl_used_in_config_but_unavail() || reloadable_perm_module_unloaded())
		config_test_reset();
		if (!config_test_all())
		{
			config_error("IRCd configuration failed to pass testing");
#ifdef _WIN32
@@ -4717,6 +4737,8 @@ int	_test_listen(ConfigFile *conf, ConfigEntry *ce)
					errors++;
					continue;
				}
				if (!strcmp(cepp->ce_varname, "ssl"))
					have_ssl_listeners = 1; /* for ssl config test */
			}
		}
		else
@@ -9888,6 +9910,17 @@ int ssl_used_in_config_but_unavail(void)
	return (errors ? 1 : 0);
}

int ssl_tests(void)
{
	if (have_ssl_listeners == 0)
	{
		config_warn("Your server is not listening on any SSL ports. It is recommended to listen on port 6697.");
		config_warn("Consider adding this to your unrealircd.conf: listen { ip *; port 6697; options { ssl; }; };");
	}

	return 1; /* always return success for now */
}

/** Check if the user attempts to unload (eg: by commenting out) a module
 * that is currently loaded and is tagged as MOD_OPT_PERM_RELOADABLE
 * (in other words: a module that allows re-loading but not un-loading)