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| //-------------------------------------------------------------
//Nom : IPC
//Role : Constructeur de la classe IPC
//-------------------------------------------------------------
__fastcall IPC::IPC(TForm1 * p_parent, bool p_CreateSuspended):
TThread(p_CreateSuspended),
parent(p_parent)
{
aEnvoyer = "Message Par Defaut du serveur";
stop= false;
}
//-------------------------------------------------------------
//Nom : CreatePipe
//Role : Créer le Pipe
//-------------------------------------------------------------
bool IPC::CreatePipe()
{
lpszPipename = TEXT(PIPE_NAME);
SECURITY_ATTRIBUTES pSa;
// The initial loop creates several instances of a named pipe
// along with an event object for each instance. An
// overlapped ConnectNamedPipe operation is started for
// each instance.
if (!CreatePipeSecurity(&pSa))
{
dwErr = GetLastError();
printf("CreatePipeSecurity failed w/err 0x%08lx\n", dwErr);
return 0;
}
Pipe.hPipeInst = CreateNamedPipe(
lpszPipename, // Pipe name.
PIPE_ACCESS_DUPLEX, // The pipe is duplex; both server and
// client processes can read from and
// write to the pipe
PIPE_TYPE_MESSAGE | // Message type pipe
PIPE_READMODE_MESSAGE | // Message-read mode
PIPE_WAIT, // Blocking mode is enabled
PIPE_UNLIMITED_INSTANCES, // Max. instances
BUFSIZE, // Output buffer size in bytes
BUFSIZE, // Input buffer size in bytes
NMPWAIT_USE_DEFAULT_WAIT, // Time-out interval
&pSa // Security attributes
); // default security attributes
if (Pipe.hPipeInst == INVALID_HANDLE_VALUE)
{
dwErr = GetLastError();
printf("CreateNamedPipe failed with %d.\n", GetLastError());
return 0;
}
}
//-------------------------------------------------------------
//Nom : AttenteDeConnexionClient
//Role : Attent qu'un client se connect
//-------------------------------------------------------------
bool IPC::AttenteDeConnexionClient()
{
// Wait for the client to connect.
wprintf(L"Waiting for the client's connection...\n");
if (!ConnectNamedPipe(Pipe.hPipeInst, NULL))
{
if (ERROR_PIPE_CONNECTED != GetLastError())
{
dwErr = GetLastError();
wprintf(L"ConnectNamedPipe failed w/err 0x%08lx\n", dwErr);
return false;
}
}
wprintf(L"Client is connected.\n");
Pipe.dwState = READING_STATE;
return true;
}
//-------------------------------------------------------------
//Nom : Gestion
//Role : Gère l'envoi et la reception des données
//-------------------------------------------------------------
void IPC::Gestion()
{
if (Pipe.dwState == READING_STATE)
{
BOOL fFinishRead = FALSE;
do
{
wchar_t chRequest[BUFSIZE];
DWORD cbRequest, cbRead;
cbRequest = sizeof(chRequest);
fFinishRead = ReadFile(
Pipe.hPipeInst, // Handle of the pipe
chRequest, // Buffer to receive data
cbRequest, // Size of buffer in bytes
&cbRead, // Number of bytes read
NULL // Not overlapped I/O
);
if (!fFinishRead && ERROR_MORE_DATA != GetLastError())
{
dwErr = GetLastError();
wprintf(L"ReadFile from pipe failed w/err 0x%08lx\n", dwErr);
stop = true;
return;
}
wprintf(L"Receive %ld bytes from client: \"%s\"\n", cbRead, chRequest);
if ( parent != NULL)
parent->Reception(AnsiString(chRequest));
} while (!fFinishRead); // Repeat loop if ERROR_MORE_DATA
}
else if (Pipe.dwState == WRITING_STATE)
{
//
// Send a response from server to client.
//
strcpy( Pipe.chReply, TEXT(aEnvoyer.c_str()) );
Pipe.cbToWrite = (lstrlen(Pipe.chReply)+1)*sizeof(TCHAR);
DWORD cbWritten;
if (!WriteFile(
Pipe.hPipeInst, // Handle of the pipe
Pipe.chReply, // Buffer to write
Pipe.cbToWrite, // Number of bytes to write
&cbWritten, // Number of bytes written
NULL // Not overlapped I/O
))
{
dwErr = GetLastError();
wprintf(L"WriteFile to pipe failed w/err 0x%08lx\n", dwErr);
stop = true;
return;
}
wprintf(L"Send %ld bytes to client: \"%s\"\n", Pipe.cbToWrite, Pipe.cbToWrite);
// Flush the pipe to allow the client to read the pipe's contents
// before disconnecting. Then disconnect the client's connection.
FlushFileBuffers(Pipe.hPipeInst);
Pipe.dwState == READING_STATE;
}
}
//-------------------------------------------------------------
//Nom : Execute
//Role : Action du thread en boucle
//-------------------------------------------------------------
void __fastcall IPC::Execute()
{
if ( CreatePipe())
{
if ( AttenteDeConnexionClient())
{
while (!stop)
{
Gestion();
}
}
DisconnectNamedPipe(Pipe.hPipeInst);
}
}
//-------------------------------------------------------------
//Nom : Envoyer
//Role : Modifi la chaine a envoyer
//-------------------------------------------------------------
void IPC::Envoyer(AnsiString msg)
{
aEnvoyer = msg;
Pipe.dwState = WRITING_STATE;
}
//-------------------------------------------------------------
//Nom : CreatePipeSecurity
//Role : Creer la securité du pipe
//-------------------------------------------------------------
bool IPC::CreatePipeSecurity(SECURITY_ATTRIBUTES * pSA)
{
BOOL fSucceeded = TRUE;
DWORD dwError = ERROR_SUCCESS;
TCHAR * szSD = TEXT("D:") // Discretionary ACL
TEXT("(D;OICI;GA;;;BG)") // Deny access to
// built-in guests
TEXT("(D;OICI;GA;;;AN)") // Deny access to
// anonymous logon
TEXT("(A;OICI;GRGWGX;;;AU)") // Allow
// read/write/execute
// to authenticated
// users
TEXT("(A;OICI;GA;;;BA)"); // Allow full control
// to administrators
if (NULL == pSA)
return FALSE;
if (!ConvertStringSecurityDescriptorToSecurityDescriptor(
szSD,
SDDL_REVISION_1,
&(pSA->lpSecurityDescriptor),
NULL))
{
fSucceeded = FALSE;
dwError = GetLastError();
}
else
{
// Allocate the memory of SECURITY_ATTRIBUTES.
pSA = (PSECURITY_ATTRIBUTES)LocalAlloc(LPTR, sizeof(*pSA));
if (pSA == NULL)
{
fSucceeded = FALSE;
dwError = GetLastError();
}
else
{
pSA->nLength = sizeof(*pSA);
pSA->bInheritHandle = FALSE;
}
}
// Clean up the allocated resources if something is wrong.
if (!fSucceeded)
{
SetLastError(dwError);
}
return fSucceeded;
} |
