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CWE-ou-minkata/MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/NucleusLib/pnNetCli/pnNcCli.cpp

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Initial Commit of CyanWorlds.com Engine Open Source Client/Plugin
14 years ago
/*==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/>.
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/pnNcCli.cpp
*
***/
#include "Pch.h"
#pragma hdrstop
//#define NCCLI_DEBUGGING
#ifdef NCCLI_DEBUGGING
# pragma message("Compiling pnNetCli with debugging on")
# define NCCLI_LOG LogMsg
#else
# define NCCLI_LOG NULL_STMT
#endif
//#define NO_ENCRYPTION
namespace pnNetCli {
/*****************************************************************************
*
* Private types and constants
*
***/
enum ENetCliMode {
kNetCliModeServerStart,
kNetCliModeClientStart,
kNetCliModeEncrypted,
kNumNetCliModes
};
} using namespace pnNetCli;
/*****************************************************************************
*
* Opaque types
*
***/
// connection structure attached to each socket
struct NetCli : THashKeyVal<Uuid> {
// communication channel
AsyncSocket sock;
ENetProtocol protocol;
NetMsgChannel * channel;
bool server;
// message queue
LINK(NetCli) link;
NetCliQueue * queue;
// message send/recv
const NetMsgInitRecv * recvMsg;
const NetMsgField * recvField;
unsigned recvFieldBytes;
bool recvDispatch;
byte * sendCurr; // points into sendBuffer
CInputAccumulator input;
// Message encryption
ENetCliMode mode;
FNetCliEncrypt encryptFcn;
byte seed[kNetMaxSymmetricSeedBytes];
CryptKey * cryptIn;
CryptKey * cryptOut;
void * encryptParam;
// Message buffers
byte sendBuffer[kAsyncSocketBufferSize];
ARRAY(byte) recvBuffer;
};
struct NetCliQueue {
LISTDECL(NetCli, link) list;
unsigned lastSendMs;
unsigned flushTimeMs;
};
namespace pnNetCli {
/*****************************************************************************
*
* Private data
*
***/
/*****************************************************************************
*
* Internal functions
*
***/
//============================================================================
static void PutBufferOnWire (NetCli * cli, void * data, unsigned bytes) {
byte * temp, * heap = NULL;
ref(temp);
if (cli->mode == kNetCliModeEncrypted) {
// Encrypt data...
#ifndef NO_ENCRYPTION
if (bytes <= 2048)
// byte count is small, use stack-based buffer
temp = ALLOCA(byte, bytes);
else
// byte count is large, use heap-based buffer
temp = heap = (byte *)ALLOC(bytes);
MemCopy(temp, data, bytes);
CryptEncrypt(cli->cryptOut, bytes, temp);
data = temp;
#endif
}
if (cli->sock)
AsyncSocketSend(cli->sock, data, bytes);
// free heap buffer (if any)
FREE(heap);
}
//============================================================================
static void FlushSendBuffer (NetCli * cli) {
const unsigned bytes = cli->sendCurr - cli->sendBuffer;
ASSERT(bytes <= arrsize(cli->sendBuffer));
PutBufferOnWire(cli, cli->sendBuffer, bytes);
cli->sendCurr = cli->sendBuffer;
}
//===========================================================================
static void AddToSendBuffer (
NetCli * cli,
unsigned bytes,
void const * const data
) {
byte const * src = (byte const *) data;
if (bytes > arrsize(cli->sendBuffer)) {
// Let the OS fragment oversize buffers
FlushSendBuffer(cli);
void * heap = ALLOC(bytes);
MemCopy(heap, data, bytes);
PutBufferOnWire(cli, heap, bytes);
FREE(heap);
}
else {
for (;;) {
// calculate the space left in the output buffer and use it
// to determine the maximum number of bytes that will fit
unsigned const left = &cli->sendBuffer[arrsize(cli->sendBuffer)] - cli->sendCurr;
unsigned const copy = min(bytes, left);
// copy the data into the buffer
for (unsigned i = 0; i < copy; ++i)
cli->sendCurr[i] = src[i];
cli->sendCurr += copy;
ASSERT(cli->sendCurr - cli->sendBuffer <= sizeof(cli->sendBuffer));
// if we copied all the data then bail
if (copy < left)
break;
src += copy;
bytes -= copy;
FlushSendBuffer(cli);
}
}
}
//============================================================================
static void BufferedSendData (
NetCli * cli,
const unsigned_ptr msg[],
unsigned fieldCount
) {
#define ASSERT_MSG_VALID(expr) \
ASSERTMSG(expr, "Invalid message definition");
#define WRITE_SWAPPED_INT(t,c) { \
ASSERT(sizeof(t) == sizeof(c)); \
t endianCount = Endian((t)c); \
AddToSendBuffer(cli, sizeof(t), (const void *) &endianCount); \
}
ASSERT(cli);
ASSERT(msg);
ASSERT(fieldCount);
if (!cli->sock)
return;
unsigned_ptr const * const msgEnd = msg + fieldCount;
ref(msgEnd);
const NetMsgInitSend * sendMsg = NetMsgChannelFindSendMessage(cli->channel, msg[0]);
ASSERT(msg[0] == sendMsg->msg.messageId);
ASSERT(fieldCount-1 == sendMsg->msg.count);
// insert messageId into command stream
const word msgId = (word) msg[0];
WRITE_SWAPPED_INT(word, msgId);
++msg;
ASSERT_MSG_VALID(msg < msgEnd);
// insert fields into command stream
dword varCount = 0;
dword varSize = 0;
const NetMsgField * cmd = sendMsg->msg.fields;
const NetMsgField * cmdEnd = cmd + sendMsg->msg.count;
for (; cmd < cmdEnd; ++msg, ++cmd) {
switch (cmd->type) {
case kNetMsgFieldInteger: {
const unsigned count = cmd->count ? cmd->count : 1;
const unsigned bytes = cmd->size * count;
void * temp = ALLOCA(byte, bytes);
if (count == 1)
// Single values are passed by value
EndianCopy(temp, (const byte *) msg, count, cmd->size);
else
// Value arrays are passed in by ptr
EndianCopy(temp, (const byte *) *msg, count, cmd->size);
// Write values to send buffer
AddToSendBuffer(cli, bytes, temp);
}
break;
case kNetMsgFieldReal: {
const unsigned count = cmd->count ? cmd->count : 1;
const unsigned bytes = cmd->size * count;
if (count == 1)
// Single values are passed in by value
AddToSendBuffer(cli, bytes, (const void *) msg);
else
// Value arrays are passed in by ptr
AddToSendBuffer(cli, bytes, (const void *) *msg);
}
break;
case kNetMsgFieldString: {
// Use less-than instead of less-or-equal because
// we reserve one space for the NULL terminator
const word length = (word) StrLen((const wchar *) *msg);
ASSERT_MSG_VALID(length < cmd->count);
// Write actual string length
WRITE_SWAPPED_INT(word, length);
// Write string data
AddToSendBuffer(cli, length * sizeof(wchar), (const void *) *msg);
}
break;
case kNetMsgFieldData:
case kNetMsgFieldRawData: {
// write values to send buffer
AddToSendBuffer(cli, cmd->count * cmd->size, (const void *) *msg);
}
break;
case kNetMsgFieldVarCount: {
ASSERT(!varCount);
ASSERT(!varSize);
// remember the element size
varSize = cmd->size;
// write the actual element count
varCount = (dword) *msg;
WRITE_SWAPPED_INT(dword, varCount);
}
break;
case kNetMsgFieldVarPtr:
case kNetMsgFieldRawVarPtr: {
ASSERT(varSize);
// write var sized array
AddToSendBuffer(cli, varCount * varSize, (const void *) *msg);
varCount = 0;
varSize = 0;
}
break;
case kNetMsgFieldPtr:
case kNetMsgFieldRawPtr: {
// write values
AddToSendBuffer(cli, cmd->count * cmd->size, (const void *) *msg);
}
break;
DEFAULT_FATAL(cmd->type);
}
}
// prepare to flush this connection
if (cli->queue)
cli->queue->list.Link(cli);
}
//===========================================================================
static bool DispatchData (NetCli * cli, void * param) {
word msgId = 0;
while (!cli->input.Eof()) {
// if we're not already decompressing a message, start new message
if (!cli->recvMsg) {
// get next message id
if (!cli->input.Get(sizeof(msgId), &msgId))
goto NEED_MORE_DATA;
msgId = Endian(msgId);
if (nil == (cli->recvMsg = NetMsgChannelFindRecvMessage(cli->channel, msgId)))
goto ERR_NO_HANDLER;
// prepare to start decompressing new fields
ASSERT(!cli->recvField);
ASSERT(!cli->recvFieldBytes);
cli->recvField = cli->recvMsg->msg.fields;
cli->recvBuffer.ZeroCount();
cli->recvBuffer.Reserve(kAsyncSocketBufferSize);
// store the message id as dword into the destination buffer
dword * recvMsgId = (dword *) cli->recvBuffer.New(sizeof(dword));
*recvMsgId = msgId;
}
for (
const NetMsgField * end = cli->recvMsg->msg.fields + cli->recvMsg->msg.count;
cli->recvField < end;
++cli->recvField
) {
switch (cli->recvField->type) {
case kNetMsgFieldInteger: {
const unsigned count
= cli->recvField->count
? cli->recvField->count
: 1;
// Get integer values
const unsigned bytes = count * cli->recvField->size;
byte * data = cli->recvBuffer.New(bytes);
if (!cli->input.Get(bytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Byte-swap integers
EndianConvert(
data,
count,
cli->recvField->size
);
// Field complete
}
break;
case kNetMsgFieldReal: {
const unsigned count
= cli->recvField->count
? cli->recvField->count
: 1;
// Get float values
const unsigned bytes = count * cli->recvField->size;
byte * data = cli->recvBuffer.New(bytes);
if (!cli->input.Get(bytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Field complete
}
break;
case kNetMsgFieldData:
case kNetMsgFieldRawData: {
// Read fixed-length data into destination buffer
const unsigned bytes = cli->recvField->count * cli->recvField->size;
byte * data = cli->recvBuffer.New(bytes);
if (!cli->input.Get(bytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Field complete
}
break;
case kNetMsgFieldVarCount: {
// Read var count field into destination buffer
const unsigned bytes = sizeof(dword);
byte * data = cli->recvBuffer.New(bytes);
if (!cli->input.Get(bytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Byte-swap value
EndianConvert((dword *) data, 1);
// Prepare to read var-length field
cli->recvFieldBytes = *(dword *)data * cli->recvField->size;
// Field complete
}
break;
case kNetMsgFieldVarPtr:
case kNetMsgFieldRawVarPtr: {
// Read var-length data into destination buffer
const unsigned bytes = cli->recvFieldBytes;
byte * data = cli->recvBuffer.New(bytes);
if (!cli->input.Get(bytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Field complete
cli->recvFieldBytes = 0;
}
break;
case kNetMsgFieldString: {
if (!cli->recvFieldBytes) {
// Read string length
word length;
if (!cli->input.Get(sizeof(word), &length))
goto NEED_MORE_DATA;
cli->recvFieldBytes = Endian(length) * sizeof(wchar);
// Validate size. Use >= instead of > to leave room for the NULL terminator.
if (cli->recvFieldBytes >= cli->recvField->count * cli->recvField->size)
goto ERR_BAD_COUNT;
}
const unsigned bytes = cli->recvField->count * cli->recvField->size;
byte * data = cli->recvBuffer.New(bytes);
// Read compressed string data (less than full field length)
if (!cli->input.Get(cli->recvFieldBytes, data)) {
cli->recvBuffer.ShrinkBy(bytes);
goto NEED_MORE_DATA;
}
// Insert NULL terminator
* (wchar *)(data + cli->recvFieldBytes) = 0;
// IDEA: fill the remainder with a freaky byte pattern
// Field complete
cli->recvFieldBytes = 0;
}
break;
}
}
// dispatch message to handler function
NCCLI_LOG(kLogPerf, L"pnNetCli: Dispatching. msg: %S. cli: %p", cli->recvMsg ? cli->recvMsg->msg.name : "(unknown)", cli);
if (!cli->recvMsg->recv(cli->recvBuffer.Ptr(), cli->recvBuffer.Count(), param))
goto ERR_DISPATCH_FAILED;
// prepare to start next message
cli->recvMsg = nil;
cli->recvField = 0;
cli->recvFieldBytes = 0;
// Release oversize message buffer
if (cli->recvBuffer.Count() > kAsyncSocketBufferSize)
cli->recvBuffer.Clear();
}
return true;
// these are used for convenience in setting breakpoints
NEED_MORE_DATA:
NCCLI_LOG(kLogPerf, L"pnNetCli: NEED_MORE_DATA. msg: %S (%u). cli: %p", cli->recvMsg ? cli->recvMsg->msg.name : "(unknown)", msgId, cli);
return true;
ERR_BAD_COUNT:
LogMsg(kLogError, L"pnNetCli: ERR_BAD_COUNT. msg: %S (%u). cli: %p", cli->recvMsg ? cli->recvMsg->msg.name : "(unknown)", msgId, cli);
return false;
ERR_NO_HANDLER:
LogMsg(kLogError, L"pnNetCli: ERR_NO_HANDLER. msg: %S (%u). cli: %p", cli->recvMsg ? cli->recvMsg->msg.name : "(unknown)", msgId, cli);
return false;
ERR_DISPATCH_FAILED:
LogMsg(kLogError, L"pnNetCli: ERR_DISPATCH_FAILED. msg: %S (%u). cli: %p", cli->recvMsg ? cli->recvMsg->msg.name : "(unknown)", msgId, cli);
return false;
}
namespace Connect {
/*****************************************************************************
*
* NetCli connect protocol
*
***/
#include <PshPack1.h>
enum {
kNetCliCli2SrvConnect,
kNetCliSrv2CliEncrypt,
kNetCliSrv2CliError,
kNumNetCliMsgs
};
struct NetCli_PacketHeader {
byte message;
byte length;
};
struct NetCli_Cli2Srv_Connect : NetCli_PacketHeader {
byte dh_y_data[kNetDiffieHellmanKeyBits / 8];
};
struct NetCli_Srv2Cli_Encrypt : NetCli_PacketHeader {
byte serverSeed[kNetMaxSymmetricSeedBytes];
};
struct NetCli_Srv2Cli_Error : NetCli_PacketHeader {
dword error; // ENetError
};
#include <PopPack.h>
//===========================================================================
static void CreateSymmetricKey (
unsigned serverBytes,
const byte * serverSeed,
unsigned clientBytes,
const byte * clientSeed,
unsigned outputBytes,
byte * outputSeed
) {
ASSERT(clientBytes == kNetMaxSymmetricSeedBytes);
ASSERT(serverBytes == kNetMaxSymmetricSeedBytes);
ASSERT(outputBytes == kNetMaxSymmetricSeedBytes);
for (unsigned i = 0; i < outputBytes; ++i)
outputSeed[i] = (byte) (clientSeed[i] ^ serverSeed[i]);
}
//============================================================================
static void ClientConnect (NetCli * cli) {
// Initiate diffie-hellman for client
BigNum clientSeed;
BigNum serverSeed;
NetMsgCryptClientStart(
cli->channel,
sizeof(cli->seed),
cli->seed,
&clientSeed,
&serverSeed
);
// Save client seed
{
ZERO(cli->seed);
unsigned bytes;
const void * data = clientSeed.GetData(&bytes);
MemCopy(cli->seed, data, min(bytes, sizeof(cli->seed)));
}
// Send server seed
if (cli->sock) {
unsigned bytes;
NetCli_Cli2Srv_Connect msg;
const void * data = serverSeed.GetData(&bytes);
ASSERTMSG(bytes <= sizeof(msg.dh_y_data), "4");
msg.message = kNetCliCli2SrvConnect;
msg.length = (byte) (sizeof(msg) - sizeof(msg.dh_y_data) + bytes);
MemCopy(msg.dh_y_data, data, bytes);
AsyncSocketSend(cli->sock, &msg, msg.length);
}
}
//============================================================================
static bool ServerRecvConnect (
NetCli * cli,
const NetCli_PacketHeader & pkt
) {
// Validate connection state
if (cli->mode != kNetCliModeServerStart)
return false;
// Validate message size
const NetCli_Cli2Srv_Connect & msg =
* (const NetCli_Cli2Srv_Connect *) &pkt;
if (pkt.length < sizeof(msg))
return false;
// Send the server seed to the client (unencrypted)
if (cli->sock) {
NetCli_Srv2Cli_Encrypt reply;
reply.message = kNetCliSrv2CliEncrypt;
reply.length = sizeof(reply);
MemCopy(reply.serverSeed, cli->seed, sizeof(reply.serverSeed));
AsyncSocketSend(cli->sock, &reply, sizeof(reply));
}
// Compute client seed
byte clientSeed[kNetMaxSymmetricSeedBytes];
{
BigNum clientSeedValue;
NetMsgCryptServerConnect(
cli->channel,
msg.length - sizeof(pkt),
msg.dh_y_data,
&clientSeedValue
);
ZERO(clientSeed);
unsigned bytes;
const void * data = clientSeedValue.GetData(&bytes);
MemCopy(clientSeed, data, min(bytes, sizeof(clientSeed)));
}
// Create the symmetric key from a combination
// of the client seed and the server seed
byte sharedSeed[kNetMaxSymmetricSeedBytes];
CreateSymmetricKey(
sizeof(cli->seed), cli->seed, // server seed
sizeof(clientSeed), clientSeed, // client seed
sizeof(sharedSeed), sharedSeed // combined seed
);
// Switch to encrypted mode
cli->mode = kNetCliModeEncrypted;
cli->cryptIn = CryptKeyCreate(kCryptRc4, sizeof(sharedSeed), sharedSeed);
cli->cryptOut = CryptKeyCreate(kCryptRc4, sizeof(sharedSeed), sharedSeed);
return cli->encryptFcn(kNetSuccess, cli->encryptParam);
}
//============================================================================
static bool ClientRecvEncrypt (
NetCli * cli,
const NetCli_PacketHeader & pkt
) {
// Validate connection state
if (cli->mode != kNetCliModeClientStart)
return false;
// Validate message size
const NetCli_Srv2Cli_Encrypt & msg =
* (const NetCli_Srv2Cli_Encrypt *) &pkt;
if (pkt.length != sizeof(msg))
return false;
// Create the symmetric key from a combination
// of the client seed and the server seed
byte sharedSeed[kNetMaxSymmetricSeedBytes];
CreateSymmetricKey(
sizeof(msg.serverSeed), msg.serverSeed, // server seed
sizeof(cli->seed), cli->seed, // client seed
sizeof(sharedSeed), sharedSeed // combined seed
);
// Switch to encrypted mode
cli->mode = kNetCliModeEncrypted;
cli->cryptIn = CryptKeyCreate(kCryptRc4, sizeof(sharedSeed), sharedSeed);
cli->cryptOut = CryptKeyCreate(kCryptRc4, sizeof(sharedSeed), sharedSeed);
return cli->encryptFcn(kNetSuccess, cli->encryptParam);
}
//============================================================================
static bool ClientRecvError (
NetCli * cli,
const NetCli_PacketHeader & pkt
) {
// Validate connection state
if (cli->mode != kNetCliModeClientStart)
return false;
// Validate message size
const NetCli_Srv2Cli_Error & msg =
* (const NetCli_Srv2Cli_Error *) &pkt;
if (pkt.length < sizeof(msg))
return false;
cli->encryptFcn((ENetError) msg.error, cli->encryptParam);
return false;
}
//============================================================================
typedef bool (* FNetCliPacket)(
NetCli * cli,
const NetCli_PacketHeader & pkt
);
#if 0
#ifdef SERVER
static const FNetCliPacket s_recvTbl[kNumNetCliMsgs] = {
ServerRecvConnect,
nil,
nil,
};
#endif
#ifdef CLIENT
static const FNetCliPacket s_recvTbl[kNumNetCliMsgs] = {
nil,
ClientRecvEncrypt,
ClientRecvError,
};
#endif
#else // 0
static const FNetCliPacket s_recvTbl[kNumNetCliMsgs] = {
ServerRecvConnect,
ClientRecvEncrypt,
ClientRecvError,
};
#endif // 0
//===========================================================================
static unsigned DispatchPacket (
NetCli * cli,
unsigned bytes,
const byte data[]
) {
for (;;) {
const NetCli_PacketHeader & pkt = * (const NetCli_PacketHeader *) data;
if (bytes < sizeof(pkt))
break;
if (pkt.length > bytes)
break;
if (pkt.message >= kNumNetCliMsgs)
break;
if (!s_recvTbl[pkt.message])
break;
if (!s_recvTbl[pkt.message](cli, pkt))
break;
// Success!
return pkt.length;
}
// Failure!
return 0;
}
} // namespace Connect
/*****************************************************************************
*
* NetCli implementation
*
***/
//===========================================================================
static void ResetSendRecv (NetCli * cli) {
cli->recvMsg = nil;
cli->recvField = nil;
cli->recvFieldBytes = 0;
cli->recvDispatch = true;
cli->sendCurr = cli->sendBuffer;
cli->recvBuffer.Clear();
cli->input.Clear();
}
//===========================================================================
static NetCli * ConnCreate (
AsyncSocket sock,
unsigned protocol,
ENetCliMode mode
) {
// find channel
unsigned largestRecv;
NetMsgChannel * channel = NetMsgChannelLock(
protocol,
mode == kNetCliModeServerStart,
&largestRecv
);
if (!channel)
return nil;
NetCli * const cli = NEWZERO(NetCli);
cli->sock = sock;
cli->protocol = (ENetProtocol) protocol;
cli->channel = channel;
cli->mode = mode;
cli->SetValue(kNilGuid);
ResetSendRecv(cli);
return cli;
}
//===========================================================================
static void SetConnSeed (
NetCli * cli,
unsigned seedBytes,
const byte seedData[]
) {
if (seedBytes)
MemCopy(cli->seed, seedData, min(sizeof(cli->seed), seedBytes));
else
CryptCreateRandomSeed(sizeof(cli->seed), cli->seed);
}
} using namespace pnNetCli;
/*****************************************************************************
*
* Exports
*
***/
//============================================================================
NetCli * NetCliConnectAccept (
AsyncSocket sock,
unsigned protocol,
bool unbuffered,
FNetCliEncrypt encryptFcn,
unsigned seedBytes,
const byte seedData[],
void * encryptParam
) {
// Create connection
NetCli * cli = ConnCreate(sock, protocol, kNetCliModeClientStart);
if (cli) {
AsyncSocketEnableNagling(sock, !unbuffered);
cli->encryptFcn = encryptFcn;
cli->encryptParam = encryptParam;
SetConnSeed(cli, seedBytes, seedData);
Connect::ClientConnect(cli);
}
return cli;
}
//============================================================================
#ifdef SERVER
NetCli * NetCliListenAccept (
AsyncSocket sock,
unsigned protocol,
bool unbuffered,
FNetCliEncrypt encryptFcn,
unsigned seedBytes,
const byte seedData[],
void * encryptParam
) {
// Create connection
NetCli * cli = ConnCreate(sock, protocol, kNetCliModeServerStart);
if (cli) {
AsyncSocketEnableNagling(sock, !unbuffered);
cli->encryptFcn = encryptFcn;
cli->encryptParam = encryptParam;
SetConnSeed(cli, seedBytes, seedData);
}
return cli;
}
#endif
//============================================================================
#ifdef SERVER
void NetCliListenReject (
AsyncSocket sock,
ENetError error
) {
if (sock) {
Connect::NetCli_Srv2Cli_Error response;
response.message = Connect::kNetCliSrv2CliError;
response.length = sizeof(response);
response.error = error;
AsyncSocketSend(sock, &response, sizeof(response));
}
}
#endif
//============================================================================
void NetCliClearSocket (NetCli * cli) {
cli->sock = nil;
}
//============================================================================
void NetCliSetQueue (
NetCli * cli,
NetCliQueue * queue
) {
cli->queue = queue;
}
//============================================================================
void NetCliDisconnect (
NetCli * cli,
bool hardClose
) {
// send any existing messages and allow
// the socket layer to complete sending data
if (!hardClose)
NetCliFlush(cli);
if (cli->sock)
AsyncSocketDisconnect(cli->sock, hardClose);
// don't allow any more messages to be received
cli->recvDispatch = false;
}
//============================================================================
void NetCliDelete (
NetCli * cli,
bool deleteSocket
) {
NetMsgChannelUnlock(cli->channel);
if (cli->sock && deleteSocket)
AsyncSocketDelete(cli->sock);
if (cli->cryptIn)
CryptKeyClose(cli->cryptIn);
if (cli->cryptOut)
CryptKeyClose(cli->cryptOut);
cli->input.Clear();
cli->recvBuffer.Clear();
DEL(cli);
}
//============================================================================
void NetCliFlush (
NetCli * cli
) {
if (cli->sendCurr != cli->sendBuffer)
FlushSendBuffer(cli);
}
//============================================================================
void NetCliSend (
NetCli * cli,
const unsigned_ptr msg[],
unsigned count
) {
BufferedSendData(cli, msg, count);
}
//============================================================================
bool NetCliDispatch (
NetCli * cli,
const byte data[],
unsigned bytes,
void * param
) {
if (!cli->recvDispatch)
return false;
do {
if (cli->mode == kNetCliModeEncrypted) {
// Decrypt data...
byte * temp, * heap = NULL;
ref(temp);
#ifndef NO_ENCRYPTION
if (bytes <= 2048)
// byte count is small, use stack-based buffer
temp = ALLOCA(byte, bytes);
else
// byte count is large, use heap-based buffer
temp = heap = (byte *)ALLOC(bytes);
MemCopy(temp, data, bytes);
CryptDecrypt(cli->cryptIn, bytes, temp);
data = temp;
#endif
// Add data to accumulator and dispatch
cli->input.Add(bytes, data);
bool result = DispatchData(cli, param);
ref(result);
#ifdef SERVER
cli->recvDispatch = result;
#endif
// free heap buffer (if any)
FREE(heap);
cli->input.Compact();
return cli->recvDispatch;
}
// Dispatch connect packets until encryption starts
unsigned used = Connect::DispatchPacket(cli, bytes, data);
if (!used)
return false;
data += used;
bytes -= used;
} while (bytes);
return true;
}