X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/a75e2b2d988881f95b2d2c65fa887d391be19a96..e33b2e471987e6c6483b5d1dafc1ac5b0da2cd31:/src/surf/network_ns3.cpp

diff --git a/src/surf/network_ns3.cpp b/src/surf/network_ns3.cpp
index a6ef627b70..ace2e772fc 100644
--- a/src/surf/network_ns3.cpp
+++ b/src/surf/network_ns3.cpp
@@ -7,6 +7,7 @@
 #include <unordered_set>
 
 #include "xbt/config.hpp"
+#include "xbt/str.h"
 #include "xbt/string.hpp"
 #include "xbt/utility.hpp"
 
@@ -70,7 +71,7 @@ NetPointNs3::NetPointNs3() : ns3_node_(ns3::CreateObject<ns3::Node>(0))
   stack.Install(ns3_node_);
 }
 
-WifiZone::WifiZone(std::string name_, simgrid::s4u::Host* host_, ns3::Ptr<ns3::Node> ap_node_,
+WifiZone::WifiZone(const std::string& name_, simgrid::s4u::Host* host_, ns3::Ptr<ns3::Node> ap_node_,
                    ns3::Ptr<ns3::YansWifiChannel> channel_, int mcs_, int nss_, int network_, int link_)
     : name(name_)
     , host(host_)
@@ -93,7 +94,7 @@ bool WifiZone::is_ap(ns3::Ptr<ns3::Node> node)
   return false;
 }
 
-WifiZone* WifiZone::by_name(std::string name)
+WifiZone* WifiZone::by_name(const std::string& name)
 {
   WifiZone* zone;
   try {
@@ -210,7 +211,24 @@ void surf_network_model_init_NS3()
 }
 
 static simgrid::config::Flag<std::string>
-    ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be : NewReno or Reno or Tahoe", "default");
+    ns3_tcp_model("ns3/TcpModel", "The ns-3 tcp model can be: NewReno or Reno or Tahoe", "default");
+static simgrid::config::Flag<std::string> ns3_seed(
+    "ns3/seed",
+    "The random seed provided to ns-3. Either 'time' to seed with time(), blank to not set (default), or a number.", "",
+    [](std::string val) {
+      if (val.length() == 0)
+        return;
+      if (strcasecmp(val.c_str(), "time") == 0) {
+        std::srand(time(NULL));
+        ns3::RngSeedManager::SetSeed(std::rand());
+        ns3::RngSeedManager::SetRun(std::rand());
+      } else {
+        int v = xbt_str_parse_int(
+            val.c_str(), "Invalid value for option ns3/seed. It must be either 'time', a number, or left empty.");
+        ns3::RngSeedManager::SetSeed(v);
+        ns3::RngSeedManager::SetRun(v);
+      }
+    });
 
 namespace simgrid {
 namespace kernel {
@@ -377,8 +395,8 @@ LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwid
 
     ns3::NetDeviceContainer netA;
     WifiZone* zone = WifiZone::by_name(name);
-    xbt_assert(zone != 0, "Link name '%s' does not match the 'wifi_link' property of a host.", name.c_str());
-    NetPointNs3* netpoint_ns3 = zone->get_host()->get_netpoint()->extension<NetPointNs3>();
+    xbt_assert(zone != nullptr, "Link name '%s' does not match the 'wifi_link' property of a host.", name.c_str());
+    auto* netpoint_ns3 = zone->get_host()->get_netpoint()->extension<NetPointNs3>();
 
     wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager", "ControlMode", ns3::StringValue("HtMcs0"), "DataMode",
                                  ns3::StringValue("HtMcs" + std::to_string(zone->get_mcs())));
@@ -407,7 +425,7 @@ LinkNS3::LinkNS3(NetworkNS3Model* model, const std::string& name, double bandwid
     zone->set_network(number_of_networks);
     zone->set_link(number_of_links);
 
-    netpoint_ns3->ipv4_address_ = transformIpv4Address(addresses.GetAddress(addresses.GetN() - 1));
+    netpoint_ns3->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
 
     if (number_of_links == 255) {
       xbt_assert(number_of_networks < 255, "Number of links and networks exceed 255*255");
@@ -572,7 +590,7 @@ void ns3_add_direct_route(simgrid::kernel::routing::NetPoint* src, simgrid::kern
     zone->add_sta_node();
     XBT_DEBUG("\tInterface stack '%s'", addr.c_str());
     auto addresses          = address.Assign(netA);
-    host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(addresses.GetN() - 1));
+    host_dst->ipv4_address_ = transformIpv4Address(addresses.GetAddress(1));
   } else {
     ns3::PointToPointHelper pointToPoint;