+/*************************************************************************
+*
+* Copyright 2020 highstreet technologies GmbH and others
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+***************************************************************************/
+
+#define _GNU_SOURCE
+
+#include "network_emulation.h"
+#include "log_utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+int network_emulation_init(void) {
+ system("tc qdisc add dev eth0 root netem limit "NETWORK_EMULATION_DEFAULT_LIMIT" delay 0ms > /dev/null");
+ return NTS_ERR_OK;
+}
+
+int network_emulation_update(const network_emultation_settings_t *s) {
+ assert(s);
+
+ char command[512];
+ if(s->delay.time && s->delay.jitter) {
+ sprintf(command, "tc qdisc change dev eth0 root netem limit %d delay %dms %dms %d%% distribution %s loss random %d%% corrupt %d%% %d%% duplicate %d%% %d%% reorder %d%% %d%% rate %dkbit > /dev/null", s->limit, s->delay.time, s->delay.jitter, s->delay.correlation, s->delay.distribution, s->loss, s->corruption.percentage, s->corruption.correlation, s->duplication.percentage, s->duplication.correlation, s->reordering.percentage, s->reordering.correlation, s->rate);
+ }
+ else {
+ sprintf(command, "tc qdisc change dev eth0 root netem limit %d delay %dms %dms %d%% loss random %d%% corrupt %d%% %d%% duplicate %d%% %d%% reorder %d%% %d%% rate %dkbit > /dev/null", s->limit, s->delay.time, s->delay.jitter, s->delay.correlation, s->loss, s->corruption.percentage, s->corruption.correlation, s->duplication.percentage, s->duplication.correlation, s->reordering.percentage, s->reordering.correlation, s->rate);
+ }
+ log_add_verbose(2, "chaning netem: %s\n", command);
+ int rc = system(command);
+ return rc;
+}