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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
Additional permissions under GNU GPL version 3 section 7
If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnNetCli/pnNcChannel.cpp
*
***/
#include "Pch.h"
#pragma hdrstop
namespace pnNetCli {
/*****************************************************************************
*
* Private
*
***/
struct ChannelCrit {
~ChannelCrit ();
ChannelCrit ();
inline void Enter () { m_critsect.Enter(); }
inline void Leave () { m_critsect.Leave(); }
inline void EnterSafe () { if (m_init) m_critsect.Enter(); }
inline void LeaveSafe () { if (m_init) m_critsect.Leave(); }
private:
bool m_init;
CCritSect m_critsect;
};
struct NetMsgChannel : AtomicRef {
LINK(NetMsgChannel) m_link;
unsigned m_protocol;
bool m_server;
// Message definitions
unsigned m_largestRecv;
ARRAY(NetMsgInitSend) m_sendMsgs;
ARRAY(NetMsgInitRecv) m_recvMsgs;
// Diffie-Hellman constants
unsigned m_dh_g;
BigNum m_dh_xa; // client: dh_x server: dh_a
BigNum m_dh_n;
};
static ChannelCrit s_channelCrit;
static LIST(NetMsgChannel) * s_channels;
/****************************************************************************
*
* ChannelCrit
*
***/
//===========================================================================
ChannelCrit::ChannelCrit () {
m_init = true;
}
//===========================================================================
ChannelCrit::~ChannelCrit () {
EnterSafe();
if (s_channels) {
while (NetMsgChannel * const channel = s_channels->Head()) {
s_channels->Unlink(channel);
channel->DecRef("ChannelLink");
}
delete s_channels;
s_channels = nil;
}
LeaveSafe();
}
/*****************************************************************************
*
* Internal functions
*
***/
//===========================================================================
// Returns max size of message in bytes
static unsigned ValidateMsg (const NetMsg & msg) {
ASSERT(msg.fields);
ASSERT(msg.count);
unsigned maxBytes = sizeof(uint16_t); // for message id
bool prevFieldWasVarCount = false;
for (unsigned i = 0; i < msg.count; i++) {
const NetMsgField & field = msg.fields[i];
for (;;) {
bool gotVarCount = false;
bool gotVarField = false;
if (field.type == kNetMsgFieldVarCount) {
if (gotVarField || gotVarCount)
FATAL("Msg definition may only include one variable length field");
gotVarCount = true;
break;
}
if (field.type == kNetMsgFieldVarPtr || field.type == kNetMsgFieldRawVarPtr) {
if (gotVarField || gotVarCount)
FATAL("Msg definition may only include one variable length field");
if (!prevFieldWasVarCount)
FATAL("Variable length field must preceded by variable length count field");
gotVarField = true;
break;
}
if (gotVarField)
FATAL("Variable length field must be the last field in message definition");
break;
}
prevFieldWasVarCount = false;
switch (field.type) {
case kNetMsgFieldInteger:
maxBytes += sizeof(uint64_t);
break;
case kNetMsgFieldReal:
maxBytes += sizeof(double);
break;
case kNetMsgFieldVarPtr:
case kNetMsgFieldRawVarPtr:
break;
case kNetMsgFieldVarCount:
prevFieldWasVarCount = true;
// fall-thru...
case kNetMsgFieldString:
case kNetMsgFieldPtr:
case kNetMsgFieldRawPtr:
case kNetMsgFieldData:
case kNetMsgFieldRawData:
maxBytes += msg.fields[i].count * msg.fields[i].size;
break;
DEFAULT_FATAL(field.type);
}
}
return maxBytes;
}
//===========================================================================
template<class T>
static unsigned MaxMsgId (const T msgs[], unsigned count) {
unsigned maxMsgId = 0;
for (unsigned i = 0; i < count; i++) {
ASSERT(msgs[i].msg.count);
maxMsgId = max(msgs[i].msg.messageId, maxMsgId);
}
return maxMsgId;
}
//===========================================================================
static void AddSendMsgs_CS (
NetMsgChannel * channel,
const NetMsgInitSend src[],
unsigned count
) {
channel->m_sendMsgs.GrowToFit(MaxMsgId(src, count), true);
for (const NetMsgInitSend * term = src + count; src < term; ++src) {
NetMsgInitSend * const dst = &channel->m_sendMsgs[src[0].msg.messageId];
// check to ensure that the message id isn't already used
ASSERT(!dst->msg.count);
*dst = *src;
ValidateMsg(dst->msg);
}
}
//===========================================================================
static void AddRecvMsgs_CS (
NetMsgChannel * channel,
const NetMsgInitRecv src[],
unsigned count
) {
channel->m_recvMsgs.GrowToFit(MaxMsgId(src, count), true);
for (const NetMsgInitRecv * term = src + count; src < term; ++src) {
ASSERT(src->recv);
NetMsgInitRecv * const dst = &channel->m_recvMsgs[src[0].msg.messageId];
// check to ensure that the message id isn't already used
ASSERT(!dst->msg.count);
// copy the message handler
*dst = *src;
const unsigned bytes = ValidateMsg(dst->msg);
channel->m_largestRecv = max(channel->m_largestRecv, bytes);
}
}
//===========================================================================
static NetMsgChannel * FindChannel_CS (unsigned protocol, bool server) {
if (!s_channels)
return nil;
NetMsgChannel * channel = s_channels->Head();
for (; channel; channel = s_channels->Next(channel)) {
if ((channel->m_protocol == protocol) && (channel->m_server == server))
break;
}
return channel;
}
//===========================================================================
static NetMsgChannel * FindOrCreateChannel_CS (unsigned protocol, bool server) {
if (!s_channels) {
s_channels = new LIST(NetMsgChannel);
s_channels->SetLinkOffset(offsetof(NetMsgChannel, m_link));
}
// find or create protocol
NetMsgChannel * channel = FindChannel_CS(protocol, server);
if (!channel) {
channel = new NetMsgChannel();
channel->m_protocol = protocol;
channel->m_server = server;
channel->m_largestRecv = 0;
s_channels->Link(channel);
channel->IncRef("ChannelLink");
}
return channel;
}
/*****************************************************************************
*
* Module functions
*
***/
//============================================================================
NetMsgChannel * NetMsgChannelLock (
unsigned protocol,
bool server,
unsigned * largestRecv
) {
NetMsgChannel * channel;
s_channelCrit.Enter();
if (nil != (channel = FindChannel_CS(protocol, server))) {
*largestRecv = channel->m_largestRecv;
channel->IncRef("ChannelLock");
}
else {
*largestRecv = 0;
}
s_channelCrit.Leave();
return channel;
}
//============================================================================
void NetMsgChannelUnlock (
NetMsgChannel * channel
) {
s_channelCrit.Enter();
{
channel->DecRef("ChannelLock");
}
s_channelCrit.Leave();
}
//============================================================================
const NetMsgInitRecv * NetMsgChannelFindRecvMessage (
NetMsgChannel * channel,
unsigned messageId
) {
// Is message in range?
if (messageId >= channel->m_recvMsgs.Count())
return nil;
// Is message defined?
const NetMsgInitRecv * recvMsg = &channel->m_recvMsgs[messageId];
if (!recvMsg->msg.count)
return nil;
// Success!
return recvMsg;
}
//============================================================================
const NetMsgInitSend * NetMsgChannelFindSendMessage (
NetMsgChannel * channel,
unsigned messageId
) {
// Is message in range?
ASSERT(messageId < channel->m_sendMsgs.Count());
// Is message defined?
const NetMsgInitSend * sendMsg = &channel->m_sendMsgs[messageId];
ASSERTMSG(sendMsg->msg.count, "NetMsg not found for send");
return sendMsg;
}
//============================================================================
void NetMsgChannelGetDhConstants (
const NetMsgChannel * channel,
unsigned * dh_g,
const BigNum ** dh_xa,
const BigNum ** dh_n
) {
if (dh_g) *dh_g = channel->m_dh_g;
if (dh_xa) *dh_xa = &channel->m_dh_xa;
if (dh_n) *dh_n = &channel->m_dh_n;
}
} // namespace pnNetCli
/*****************************************************************************
*
* Exports
*
***/
//===========================================================================
void NetMsgProtocolRegister (
unsigned protocol,
bool server,
const NetMsgInitSend sendMsgs[],
unsigned sendMsgCount,
const NetMsgInitRecv recvMsgs[],
unsigned recvMsgCount,
unsigned dh_g,
const BigNum & dh_xa, // client: dh_x server: dh_a
const BigNum & dh_n
) {
s_channelCrit.EnterSafe();
{
NetMsgChannel * channel = FindOrCreateChannel_CS(protocol, server);
// make sure no connections have been established on this protocol, otherwise
// we'll be modifying a live data structure; NetCli's don't lock their protocol
// to operate on it once they have linked to it!
ASSERT(channel->GetRefCount() == 1);
channel->m_dh_g = dh_g;
channel->m_dh_xa = dh_xa;
channel->m_dh_n = dh_n;
if (sendMsgCount)
AddSendMsgs_CS(channel, sendMsgs, sendMsgCount);
if (recvMsgCount)
AddRecvMsgs_CS(channel, recvMsgs, recvMsgCount);
}
s_channelCrit.LeaveSafe();
}
//===========================================================================
void NetMsgProtocolDestroy (unsigned protocol, bool server) {
s_channelCrit.EnterSafe();
if (NetMsgChannel * channel = FindChannel_CS(protocol, server)) {
s_channels->Unlink(channel);
channel->DecRef("ChannelLink");
}
s_channelCrit.LeaveSafe();
}