lighttpd2/src/main/plugin_core.c

#include <lighttpd/base.h>
#include <lighttpd/plugin_core.h>
#include <lighttpd/profiler.h>

#include <sys/stat.h>
#include <fcntl.h>

static liAction* core_list(liServer *srv, liPlugin* p, liValue *val) {
	liAction *a;
	guint i;
	UNUSED(p);

	if (!val) {
		ERROR(srv, "%s", "need parameter");
		return NULL;
	}

	if (val->type == LI_VALUE_ACTION) {
		a = val->data.val_action.action;
		li_action_acquire(a);
		return a;
	}

	if (val->type != LI_VALUE_LIST) {
		ERROR(srv, "expected list, got %s", li_value_type_string(val->type));
		return NULL;
	}

	a = li_action_new_list();
	for (i = 0; i < val->data.list->len; i++) {
		liValue *oa = g_array_index(val->data.list, liValue*, i);
		if (oa->type != LI_VALUE_ACTION) {
			ERROR(srv, "expected action at entry %u of list, got %s", i, li_value_type_string(oa->type));
			li_action_release(srv, a);
			return NULL;
		}
		assert(srv == oa->data.val_action.srv);
		li_action_acquire(oa->data.val_action.action);
		g_array_append_val(a->data.list, oa->data.val_action.action);
	}
	return a;
}

static liAction* core_when(liServer *srv, liPlugin* p, liValue *val) {
	liValue *val_cond, *val_act, *val_act_else;
	liAction *a, *act = NULL, *act_else = NULL;
	UNUSED(p);

	if (!val) {
		ERROR(srv, "%s", "need parameter");
		return NULL;
	}
	if (val->type != LI_VALUE_LIST) {
		ERROR(srv, "expected list, got %s", li_value_type_string(val->type));
		return NULL;
	}
	if (val->data.list->len == 2) {
		val_act_else = NULL;
		act_else = NULL;
	} else if (val->data.list->len == 3) {
		val_act_else = g_array_index(val->data.list, liValue*, 2);
	} else {
		ERROR(srv, "expected list with length 2 or 3, has length %u", val->data.list->len);
		return NULL;
	}
	val_cond = g_array_index(val->data.list, liValue*, 0);
	val_act = g_array_index(val->data.list, liValue*, 1);

	if (val_cond->type != LI_VALUE_CONDITION) {
		ERROR(srv, "expected condition as first parameter, got %s", li_value_type_string(val_cond->type));
		return NULL;
	}
	if (val_act->type == LI_VALUE_NONE) {
		act = NULL;
	} else if (val_act->type == LI_VALUE_ACTION) {
		act = val_act->data.val_action.action;
	} else {
		ERROR(srv, "expected action as second parameter, got %s", li_value_type_string(val_act->type));
		return NULL;
	}
	if (val_act_else) {
		if (val_act_else->type == LI_VALUE_NONE) {
			act_else = NULL;
		} else if (val_act_else->type == LI_VALUE_ACTION) {
			act_else = val_act_else->data.val_action.action;
		} else {
			ERROR(srv, "expected action as third parameter, got %s", li_value_type_string(val_act_else->type));
			return NULL;
		}
	}
	li_condition_acquire(val_cond->data.val_cond.cond);
	if (act) li_action_acquire(act);
	if (act_else) li_action_acquire(act_else);
	a = li_action_new_condition(val_cond->data.val_cond.cond, act, act_else);
	return a;
}

static liAction* core_set(liServer *srv, liPlugin* p, liValue *val) {
	liValue *val_val, *val_name;
	liAction *a;
	UNUSED(p);

	if (!val) {
		ERROR(srv, "%s", "need parameter");
		return NULL;
	}
	if (val->type != LI_VALUE_LIST) {
		ERROR(srv, "expected list, got %s", li_value_type_string(val->type));
		return NULL;
	}
	if (val->data.list->len != 2) {
		ERROR(srv, "expected list with length 2, has length %u", val->data.list->len);
		return NULL;
	}
	val_name = g_array_index(val->data.list, liValue*, 0);
	val_val = g_array_index(val->data.list, liValue*, 1);
	if (val_name->type != LI_VALUE_STRING) {
		ERROR(srv, "expected string as first parameter, got %s", li_value_type_string(val_name->type));
		return NULL;
	}
	a = li_option_action(srv, val_name->data.string->str, val_val);
	return a;
}

static gboolean core_setup_set(liServer *srv, liPlugin* p, liValue *val) {
	liValue *val_val, *val_name;
	UNUSED(p);

	if (!val) {
		ERROR(srv, "%s", "need parameter");
		return FALSE;
	}
	if (val->type != LI_VALUE_LIST) {
		ERROR(srv, "expected list, got %s", li_value_type_string(val->type));
		return FALSE;
	}
	if (val->data.list->len != 2) {
		ERROR(srv, "expected list with length 2, has length %u", val->data.list->len);
		return FALSE;
	}
	val_name = g_array_index(val->data.list, liValue*, 0);
	val_val = g_array_index(val->data.list, liValue*, 1);
	if (val_name->type != LI_VALUE_STRING) {
		ERROR(srv, "expected string as first parameter, got %s", li_value_type_string(val_name->type));
		return FALSE;
	}
	return li_plugin_set_default_option(srv, val_name->data.string->str, val_val);
}

static liHandlerResult core_handle_docroot(liVRequest *vr, gpointer param, gpointer *context) {
	UNUSED(context);

	g_string_truncate(vr->physical.doc_root, 0);
	g_string_append_len(vr->physical.doc_root, GSTR_LEN((GString*) param));
	/* reset stat info because path has changed */
	vr->physical.have_stat = FALSE;
	vr->physical.have_errno = FALSE;

	VR_DEBUG(vr, "docroot: %s", vr->physical.doc_root->str);

	/* build physical path: docroot + uri.path */
	g_string_truncate(vr->physical.path, 0);
	g_string_append_len(vr->physical.path, GSTR_LEN(vr->physical.doc_root));
	g_string_append_len(vr->physical.path, GSTR_LEN(vr->request.uri.path));

	VR_DEBUG(vr, "physical path: %s", vr->physical.path->str);

	return LI_HANDLER_GO_ON;
}

static void core_docroot_free(liServer *srv, gpointer param) {
	UNUSED(srv);
	g_string_free(param, TRUE);
}

static liAction* core_docroot(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);
	if (!val || val->type != LI_VALUE_STRING) {
		ERROR(srv, "%s", "docroot action expects a string parameter");
		return NULL;
	}

	return li_action_new_function(core_handle_docroot, NULL, core_docroot_free, li_value_extract(val).string);
}


static liHandlerResult core_handle_index(liVRequest *vr, gpointer param, gpointer *context) {
	liHandlerResult res;
	guint i;
	struct stat st;
	gint err;
	GString *file, *tmp_docroot, *tmp_path;
	GArray *files = param;

	UNUSED(context);

	if (!vr->physical.doc_root->len) {
		VR_ERROR(vr, "%s", "no docroot specified yet but index action called");
		return LI_HANDLER_ERROR;
	}


	res = li_stat_cache_get(vr, vr->physical.path, &st, &err, NULL);
	if (res == LI_HANDLER_WAIT_FOR_EVENT)
		return LI_HANDLER_WAIT_FOR_EVENT;

	if (res == LI_HANDLER_ERROR) {
		/* we ignore errors here so a later action can deal with it (e.g. 'static') */
		return LI_HANDLER_GO_ON;
	}

	if (!S_ISDIR(st.st_mode))
		return LI_HANDLER_GO_ON;

	/* we use two temporary strings here, one to append to docroot and one to append to physical path */
	tmp_docroot = vr->wrk->tmp_str;
	g_string_truncate(tmp_docroot, 0);
	g_string_append_len(vr->wrk->tmp_str, GSTR_LEN(vr->physical.doc_root));
	tmp_path = g_string_new_len(GSTR_LEN(vr->physical.path));

	/* loop through the list to find a possible index file */
	for (i = 0; i < files->len; i++) {
		file = g_array_index(files, liValue*, i)->data.string;

		if (file->str[0] == '/') {
			/* entries beginning with a slash shall be looked up directly at the docroot */
			g_string_truncate(tmp_docroot, vr->physical.doc_root->len);
			g_string_append_len(tmp_docroot, GSTR_LEN(file));
			res = li_stat_cache_get(vr, tmp_docroot, &st, &err, NULL);
		} else {
			g_string_truncate(tmp_path, vr->physical.path->len);
			g_string_append_len(tmp_path, GSTR_LEN(file));
			res = li_stat_cache_get(vr, tmp_path, &st, &err, NULL);
		}

		if (res == LI_HANDLER_WAIT_FOR_EVENT) {
			g_string_free(tmp_path, TRUE);
			return LI_HANDLER_WAIT_FOR_EVENT;
		}

		if (res == LI_HANDLER_GO_ON) {
			/* file exists. change physical path */
			if (file->str[0] == '/')
				g_string_truncate(vr->physical.path, vr->physical.doc_root->len);

			g_string_append_len(vr->physical.path, GSTR_LEN(file));

			if (CORE_OPTION(LI_CORE_OPTION_DEBUG_REQUEST_HANDLING).boolean) {
				VR_DEBUG(vr, "using index file: '%s'", file->str);
			}

			g_string_free(tmp_path, TRUE);

			return LI_HANDLER_GO_ON;
		}
	}

	g_string_free(tmp_path, TRUE);

	return LI_HANDLER_GO_ON;
}

static void core_index_free(liServer *srv, gpointer param) {
	guint i;
	GArray *files = param;

	UNUSED(srv);

	for (i = 0; i < files->len; i++) 
		li_value_free(g_array_index(files, liValue*, i));

	g_array_free(files, TRUE);
}

static liAction* core_index(liServer *srv, liPlugin* p, liValue *val) {
	GArray *files;
	guint i;

	UNUSED(p);

	if (!val || val->type != LI_VALUE_LIST) {
		ERROR(srv, "%s", "index action expects a list of strings as parameter");
		return NULL;
	}

	files = val->data.list;

	for (i = 0; i < files->len; i++) {
		if (g_array_index(files, liValue*, i)->type != LI_VALUE_STRING) {
			ERROR(srv, "%s", "index action expects a list of strings as parameter");
			return NULL;
		}
	}

	return li_action_new_function(core_handle_index, NULL, core_index_free, li_value_extract(val).list);
}


static liHandlerResult core_handle_static(liVRequest *vr, gpointer param, gpointer *context) {
	int fd;
	struct stat st;
	int err;
	liHandlerResult res;

	UNUSED(param);
	UNUSED(context);

	switch (vr->request.http_method) {
	case LI_HTTP_METHOD_GET:
	case LI_HTTP_METHOD_HEAD:
		break;
	default:
		return LI_HANDLER_GO_ON;
	}

	if (li_vrequest_is_handled(vr)) return LI_HANDLER_GO_ON;

	if (vr->physical.path->len == 0) return LI_HANDLER_GO_ON;

	res = li_stat_cache_get(vr, vr->physical.path, &st, &err, &fd);
	if (res == LI_HANDLER_WAIT_FOR_EVENT)
		return res;

	if (CORE_OPTION(LI_CORE_OPTION_DEBUG_REQUEST_HANDLING).boolean) {
		VR_DEBUG(vr, "try serving static file: '%s'", vr->physical.path->str);
	}

	if (res == LI_HANDLER_ERROR) {
		/* open or fstat failed */

		if (fd != -1)
			close(fd);

		if (!li_vrequest_handle_direct(vr)) {
			return LI_HANDLER_ERROR;
		}

		switch (err) {
		case ENOENT:
		case ENOTDIR:
			vr->response.http_status = 404;
			return LI_HANDLER_GO_ON;
		case EACCES:
			vr->response.http_status = 403;
			return LI_HANDLER_GO_ON;
		default:
			VR_ERROR(vr, "stat() or open() for '%s' failed: %s", vr->physical.path->str, g_strerror(err));
			return LI_HANDLER_ERROR;
		}
	} else if (S_ISDIR(st.st_mode)) {
		if (fd != -1)
			close(fd);
		return LI_HANDLER_GO_ON;
	} else if (!S_ISREG(st.st_mode)) {
		if (CORE_OPTION(LI_CORE_OPTION_DEBUG_REQUEST_HANDLING).boolean) {
			VR_DEBUG(vr, "not a regular file: '%s'", vr->physical.path->str);
		}
		
		if (fd != -1)
			close(fd);

		if (!li_vrequest_handle_direct(vr)) {
			return LI_HANDLER_ERROR;
		}
		vr->response.http_status = 403;
	} else {
		GString *mime_str;
		gboolean cachable;
#ifdef FD_CLOEXEC
		fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif

		if (!li_vrequest_handle_direct(vr)) {
			close(fd);
			return LI_HANDLER_ERROR;
		}

		li_etag_set_header(vr, &st, &cachable);
		if (cachable) {
			vr->response.http_status = 304;
			close(fd);
			return LI_HANDLER_GO_ON;
		}

		mime_str = li_mimetype_get(vr, vr->physical.path);
		vr->response.http_status = 200;
		if (mime_str)
			li_http_header_overwrite(vr->response.headers, CONST_STR_LEN("Content-Type"), GSTR_LEN(mime_str));
		else
			li_http_header_overwrite(vr->response.headers, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("application/octet-stream"));
		li_chunkqueue_append_file_fd(vr->out, NULL, 0, st.st_size, fd);
	}

	return LI_HANDLER_GO_ON;
}

static liAction* core_static(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);
	if (val) {
		ERROR(srv, "%s", "static action doesn't have parameters");
		return NULL;
	}

	return li_action_new_function(core_handle_static, NULL, NULL, NULL);
}


static liHandlerResult core_handle_status(liVRequest *vr, gpointer param, gpointer *context) {
	UNUSED(param);
	UNUSED(context);

	vr->response.http_status = GPOINTER_TO_INT(param);

	return LI_HANDLER_GO_ON;
}

static liAction* core_status(liServer *srv, liPlugin* p, liValue *val) {
	gpointer ptr;

	UNUSED(p);

	if (val || val->type != LI_VALUE_NUMBER) {
		ERROR(srv, "%s", "status action expects a number as parameter");
		return NULL;
	}

	ptr = GINT_TO_POINTER((gint) li_value_extract(val).number);

	return li_action_new_function(core_handle_status, NULL, NULL, ptr);
}


static void core_log_write_free(liServer *srv, gpointer param) {
	UNUSED(srv);
	g_string_free(param, TRUE);
}

static liHandlerResult core_handle_log_write(liVRequest *vr, gpointer param, gpointer *context) {
	GString *msg = param;

	UNUSED(context);

	VR_INFO(vr, "%s", msg->str);

	return LI_HANDLER_GO_ON;
}

static liAction* core_log_write(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);
	if (!val || val->type != LI_VALUE_STRING) {
		ERROR(srv, "%s", "log.write expects a string parameter");
		return NULL;
	}

	return li_action_new_function(core_handle_log_write, NULL, core_log_write_free, li_value_extract(val).string);
}


static liHandlerResult core_handle_blank(liVRequest *vr, gpointer param, gpointer *context) {
	UNUSED(param);
	UNUSED(context);

	if (!li_vrequest_handle_direct(vr)) return LI_HANDLER_GO_ON;

	vr->response.http_status = 200;

	return LI_HANDLER_GO_ON;
}

static liAction* core_blank(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);

	if (val) {
		ERROR(srv, "%s", "'blank' action doesn't have parameters");
		return NULL;
	}

	return li_action_new_function(core_handle_blank, NULL, NULL, NULL);
}

static liHandlerResult core_handle_profile_mem(liVRequest *vr, gpointer param, gpointer *context) {
	UNUSED(vr);
	UNUSED(param);
	UNUSED(context);

	/*g_mem_profile();*/
	profiler_dump();

	return LI_HANDLER_GO_ON;
}

static liAction* core_profile_mem(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);

	if (val) {
		ERROR(srv, "%s", "'profile_mem' action doesn't have parameters");
		return NULL;
	}

	return li_action_new_function(core_handle_profile_mem, NULL, NULL, NULL);
}

static gboolean core_listen(liServer *srv, liPlugin* p, liValue *val) {
	GString *ipstr;
	UNUSED(p);

	if (val->type != LI_VALUE_STRING) {
		ERROR(srv, "%s", "listen expects a string as parameter");
		return FALSE;
	}

	ipstr = val->data.string;
	li_angel_listen(srv, ipstr);

	return TRUE;
}


static gboolean core_event_handler(liServer *srv, liPlugin* p, liValue *val) {
	guint backend;
	gchar *str;
	UNUSED(p);

	if (val->type != LI_VALUE_STRING) {
		ERROR(srv, "%s", "event_handler expects a string as parameter");
		return FALSE;
	}

	str = val->data.string->str;
	backend = 0; /* libev will chose the right one by default */

	if (g_str_equal(str, "select"))
		backend = EVBACKEND_SELECT;
	else if (g_str_equal(str, "poll"))
		backend = EVBACKEND_POLL;
	else if (g_str_equal(str, "epoll"))
		backend = EVBACKEND_EPOLL;
	else if (g_str_equal(str, "kqueue"))
		backend = EVBACKEND_KQUEUE;
	else if (g_str_equal(str, "devpoll"))
		backend = EVBACKEND_DEVPOLL;
	else if (g_str_equal(str, "port"))
		backend = EVBACKEND_PORT;
	else {
		ERROR(srv, "unkown event handler: '%s'", str);
		return FALSE;
	}

	if (backend) {
		if (!(ev_supported_backends() & backend)) {
			ERROR(srv, "unsupported event handler: '%s'", str);
			return FALSE;
		}

		if (!(ev_recommended_backends() & backend)) {
			DEBUG(srv, "warning: event handler '%s' not recommended for this platform!", str);
		}
	}

	srv->loop_flags |= backend;

	return TRUE;
}

static gboolean core_workers(liServer *srv, liPlugin* p, liValue *val) {
	gint workers;
	UNUSED(p);

	workers = val->data.number;
	if (val->type != LI_VALUE_NUMBER || workers < 1) {
		ERROR(srv, "%s", "workers expects a positive integer as parameter");
		return FALSE;
	}

	if (srv->worker_count != 0) {
		ERROR(srv, "workers already called with '%i', overwriting", srv->worker_count);
	}
	srv->worker_count = workers;
	return TRUE;
}

static gboolean core_module_load(liServer *srv, liPlugin* p, liValue *val) {
	liValue *mods = li_value_new_list();
	UNUSED(p);

	if (!g_module_supported()) {
		ERROR(srv, "%s", "module loading not supported on this platform");
		li_value_free(mods);
		return FALSE;
	}

	if (val->type == LI_VALUE_STRING) {
		/* load only one module */
		liValue *name = li_value_new_string(li_value_extract(val).string);
		g_array_append_val(mods->data.list, name);
	} else if (val->type == LI_VALUE_LIST) {
		/* load a list of modules */
		for (guint i = 0; i < val->data.list->len; i++) {
			liValue *v = g_array_index(val->data.list, liValue*, i);
			if (v->type != LI_VALUE_STRING) {
				ERROR(srv, "module_load takes either a string or a list of strings as parameter, list with %s entry given", li_value_type_string(v->type));
				li_value_free(mods);
				return FALSE;
			}
		}
		g_array_free(mods->data.list, TRUE);
		mods->data.list = li_value_extract(val).list;
	} else {
		ERROR(srv, "module_load takes either a string or a list of strings as parameter, %s given", li_value_type_string(val->type));
		return FALSE;
	}

	/* parameter types ok, load modules */
	for (guint i = 0; i < mods->data.list->len; i++) {
		GString *name = g_array_index(mods->data.list, liValue*, i)->data.string;
		if (!li_module_load(srv->modules, name->str)) {
			ERROR(srv, "could not load module '%s': %s", name->str, g_module_error());
			li_value_free(mods);
			return FALSE;
		}

		DEBUG(srv, "loaded module '%s'", name->str);
	}

	li_value_free(mods);

	return TRUE;
}

static gboolean core_io_timeout(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);

	if (!val || val->type != LI_VALUE_NUMBER || val->data.number < 1) {
		ERROR(srv, "%s", "io_timeout expects a positive number as parameter");
		return FALSE;
	}

	srv->io_timeout = li_value_extract(val).number;

	return TRUE;
}

static gboolean core_stat_cache_ttl(liServer *srv, liPlugin* p, liValue *val) {
	UNUSED(p);

	if (!val || val->type != LI_VALUE_NUMBER || val->data.number < 1) {
		ERROR(srv, "%s", "stat_cache.ttl expects a positive number as parameter");
		return FALSE;
	}

	srv->stat_cache_ttl = (gdouble)li_value_extract(val).number;

	return TRUE;
}

/*
 * OPTIONS
 */

static gboolean core_option_log_parse(liServer *srv, liPlugin *p, size_t ndx, liValue *val, liOptionValue *oval) {
	GHashTableIter iter;
	gpointer k, v;
	liLogLevel level;
	GString *path;
	GString *level_str;
	GArray *arr = g_array_sized_new(FALSE, TRUE, sizeof(liLog*), 6);
	UNUSED(p);
	UNUSED(ndx);

	oval->list = arr;
	g_array_set_size(arr, 6);

	/* default value */
	if (!val) {
		/* default: log LI_LOG_LEVEL_WARNING, LI_LOG_LEVEL_ERROR and LI_LOG_LEVEL_BACKEND to stderr */
		liLog *log = srv->logs.stderr;
		log_ref(srv, log);
		g_array_index(arr, liLog*, LI_LOG_LEVEL_WARNING) = log;
		log_ref(srv, log);
		g_array_index(arr, liLog*, LI_LOG_LEVEL_ERROR) = log;
		log_ref(srv, log);
		g_array_index(arr, liLog*, LI_LOG_LEVEL_BACKEND) = log;
		return TRUE;
	}

	g_hash_table_iter_init(&iter, val->data.hash);
	while (g_hash_table_iter_next(&iter, &k, &v)) {
		if (((liValue*)v)->type != LI_VALUE_STRING) {
			ERROR(srv, "log expects a hashtable with string values, %s given", li_value_type_string(((liValue*)v)->type));
			g_array_free(arr, TRUE);
			return FALSE;
		}

		path = ((liValue*)v)->data.string;
		level_str = (GString*)k;

		if (g_str_equal(level_str->str, "*")) {
			for (guint i = 0; i < arr->len; i++) {
				liLog *log;

				if (NULL != g_array_index(arr, liLog*, i))
					continue;
				log = log_new(srv, log_type_from_path(path), path);
				g_array_index(arr, liLog*, i) = log;
			}
		}
		else {
			liLog *log = log_new(srv, log_type_from_path(path), path);
			level = log_level_from_string(level_str);
			g_array_index(arr, liLog*, level) = log;
		}
	}

	return TRUE;
}

static void core_option_log_free(liServer *srv, liPlugin *p, size_t ndx, liOptionValue oval) {
	GArray *arr = oval.list;
	UNUSED(p);
	UNUSED(ndx);

	if (!arr) return;

	for (guint i = 0; i < arr->len; i++) {
		if (NULL != g_array_index(arr, liLog*, i))
			log_unref(srv, g_array_index(arr, liLog*, i));
	}
	g_array_free(arr, TRUE);
}

static gboolean core_option_log_timestamp_parse(liServer *srv, liPlugin *p, size_t ndx, liValue *val, liOptionValue *oval) {
	UNUSED(p);
	UNUSED(ndx);

	if (!val) return TRUE;
	oval->ptr = li_log_timestamp_new(srv, li_value_extract(val).string);

	return TRUE;
}

static void core_option_log_timestamp_free(liServer *srv, liPlugin *p, size_t ndx, liOptionValue oval) {
	UNUSED(p);
	UNUSED(ndx);

	if (!oval.ptr) return;
	li_log_timestamp_free(srv, oval.ptr);
}

static gboolean core_option_mime_types_parse(liServer *srv, liPlugin *p, size_t ndx, liValue *val, liOptionValue *oval) {
	GArray *arr;
	UNUSED(srv);
	UNUSED(p);
	UNUSED(ndx);


	/* default value */
	if (!val) {
		oval->list = g_array_new(FALSE, TRUE, sizeof(liValue));
		return TRUE;
	}

	/* check if the passed val is of type (("a", "b"), ("x", y")) */
	arr = val->data.list;
	for (guint i = 0; i < arr->len; i++) {
		liValue *v = g_array_index(arr, liValue*, i);
		liValue *v1, *v2;
		if (v->type != LI_VALUE_LIST) {
			ERROR(srv, "mime_types option expects a list of string tuples, entry #%u is of type %s", i, li_value_type_string(v->type));
			return FALSE;
		}

		if (v->data.list->len != 2) {
			ERROR(srv, "mime_types option expects a list of string tuples, entry #%u is not a tuple", i);
			return FALSE;
		}

		v1 = g_array_index(v->data.list, liValue*, 0);
		v2 = g_array_index(v->data.list, liValue*, 1);
		if (v1->type != LI_VALUE_STRING || v2->type != LI_VALUE_STRING) {
			ERROR(srv, "mime_types option expects a list of string tuples, entry #%u is a (%s,%s) tuple", i, li_value_type_string(v1->type), li_value_type_string(v2->type));
			return FALSE;
		}
	}

	/* everything ok */
	oval->list = li_value_extract(val).list;

	return TRUE;
}

static void core_option_mime_types_free(liServer *srv, liPlugin *p, size_t ndx, liOptionValue oval) {
	UNUSED(srv);
	UNUSED(p);
	UNUSED(ndx);

	for (guint i = 0; i < oval.list->len; i++)
		li_value_free(g_array_index(oval.list, liValue*, i));

	g_array_free(oval.list, TRUE);
}

static gboolean core_option_etag_use_parse(liServer *srv, liPlugin *p, size_t ndx, liValue *val, liOptionValue *oval) {
	GArray *arr;
	guint flags = 0;
	UNUSED(p);
	UNUSED(ndx);

	/* default value */
	if (!val) {
		oval->number = LI_ETAG_USE_INODE | LI_ETAG_USE_MTIME | LI_ETAG_USE_SIZE;
		return TRUE;
	}

	if (val->type != LI_VALUE_LIST) {
		ERROR(srv, "etag.use option expects a list of strings, parameter is of type %s", li_value_type_string(val->type));
	}

	arr = val->data.list;
	for (guint i = 0; i < arr->len; i++) {
		liValue *v = g_array_index(arr, liValue*, i);
		if (v->type != LI_VALUE_STRING) {
			ERROR(srv, "etag.use option expects a list of strings, entry #%u is of type %s", i, li_value_type_string(v->type));
			return FALSE;
		}

		if (0 == strcmp(v->data.string->str, "inode")) {
			flags |= LI_ETAG_USE_INODE;
		} else if (0 == strcmp(v->data.string->str, "mtime")) {
			flags |= LI_ETAG_USE_MTIME;
		} else if (0 == strcmp(v->data.string->str, "size")) {
			flags |= LI_ETAG_USE_SIZE;
		} else {
			ERROR(srv, "unknown etag.use flag: %s", v->data.string->str);
			return FALSE;
		}
	}

	oval->number = (guint64) flags;
	return TRUE;
}

static liHandlerResult core_handle_header_add(liVRequest *vr, gpointer param, gpointer *context) {
	GArray *l = (GArray*)param;
	GString *k = g_array_index(l, liValue*, 0)->data.string;
	GString *v = g_array_index(l, liValue*, 1)->data.string;
	UNUSED(param);
	UNUSED(context);

	li_http_header_insert(vr->response.headers, GSTR_LEN(k), GSTR_LEN(v));

	return LI_HANDLER_GO_ON;
}

static void core_header_free(liServer *srv, gpointer param) {
	UNUSED(srv);
	li_value_list_free(param);
}

static liAction* core_header_add(liServer *srv, liPlugin* p, liValue *val) {
	GArray *l;
	UNUSED(p);