Add network emulation feature.

[sim/o1-interface.git] / ntsimulator / ntsim-ng / utils / network_emulation.c

diff --git a/ntsimulator/ntsim-ng/utils/network_emulation.c b/ntsimulator/ntsim-ng/utils/network_emulation.c
new file mode 100644 (file)
index 0000000..94af8c8
--- /dev/null
+++ b/ntsimulator/ntsim-ng/utils/network_emulation.c
@@ -0,0 +1,44 @@
+/*************************************************************************
+*
+* 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;
+}