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/* Copyright (C) 2025 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "NetEnet.h"
#include "ps/ConfigDB.h"
#include <span>
namespace PS
{
namespace Enet
{
// ENet protocol MTU
// ENet by default uses 1400 as ENet packet fragment max size, adding ICMP and
// IPv4 headers this may exceed the MTU for some VPN solutions [1], so provide
// a lower default.
// MTU negotiation server-side needs [2], which was merged after enet-1.3.17,
// so the user configured value may be ignored on older versions.
// [1] https://github.com/lsalzman/enet/issues/132
// [2] https://github.com/lsalzman/enet/pull/222
constexpr enet_uint32 HOST_DEFAULT_MTU = 1372;
ENetHost* CreateHost(const ENetAddress* address, size_t peerCount, size_t channelLimit)
{
// TODO: Maybe allow user to set rate limits?
ENetHost* host = enet_host_create(address, peerCount, channelLimit, 0, 0);
if (!host)
return nullptr;
// Public ENet API doesn't offer a means to change MTU, so do it in a
// way least likely to break with ENet updates.
host->mtu = g_ConfigDB.Get("network.enetmtu", HOST_DEFAULT_MTU);
for (ENetPeer& p : std::span{host->peers, host->peerCount})
enet_peer_reset(&p);
return host;
}
} // namespace Enet
} // namespace PS
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