reactos/base/services/tcpsvcs/chargen.c

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/*
* PROJECT: ReactOS simple TCP/IP services
* LICENSE: GPL - See COPYING in the top level directory
* FILE: base/services/tcpsvcs/chargen.c
* PURPOSE: Sends continuous lines of chars to the client
* COPYRIGHT: Copyright 2005 - 2008 Ged Murphy <gedmurphy@reactos.org>
*
*/
#include "tcpsvcs.h"
/* printable ASCII's characters for chargen */
#define ASCII_START 32
#define ASCII_END 126
#define NUM_CHARS ASCII_END - ASCII_START + 1
/* number of chars to put on a line */
#define LINESIZE 74 // 72 + CR + NL
static BOOL
SendLine(SOCKET sock, LPSTR lpLine)
{
BOOL bRet = FALSE;
/*FIXME: need to establish if peer closes connection, not just report a socket error */
INT retVal = send(sock, lpLine, LINESIZE, 0);
if (retVal > 0)
{
if (retVal == LINESIZE)
{
bRet = TRUE;
}
else
{
LogEvent(L"Chargen: Not sent enough bytes", 0, 0, LOG_FILE);
}
}
else if (retVal == SOCKET_ERROR)
{
LogEvent(L"Chargen: Socket error\n", WSAGetLastError(), 0, LOG_ERROR);
}
else
{
LogEvent(L"Chargen: unknown error\n", WSAGetLastError(), 0, LOG_ERROR);
}
return bRet;
}
static BOOL
GenerateChars(SOCKET sock)
{
CHAR chars[NUM_CHARS];
CHAR line[LINESIZE];
INT charIndex;
INT loopIndex;
INT i;
/* fill the array with printable characters */
for (charIndex = 0, i = ASCII_START; i <= ASCII_END; charIndex++, i++)
chars[charIndex] = (CHAR)i;
loopIndex = 0;
while (!bShutdown)
{
/* reset the loop when we hit the last char */
if (loopIndex == NUM_CHARS)
loopIndex = 0;
/* fill a line array to send */
charIndex = loopIndex;
for (i=0; i < LINESIZE - 2; i++)
{
line[i] = chars[charIndex];
/* if we hit the end char, reset it */
if (chars[charIndex] == chars[NUM_CHARS - 1])
charIndex = 0;
else
charIndex++;
}
line[LINESIZE - 2] = '\r';
line[LINESIZE - 1] = '\n';
if (!SendLine(sock, line))
break;
/* start printing from next char in the array */
loopIndex++;
}
return TRUE;
}
DWORD WINAPI
ChargenHandler(VOID* sock_)
{
INT retVal = 0;
SOCKET sock = (SOCKET)sock_;
if (!GenerateChars(sock))
{
LogEvent(L"Chargen: Char generation failed", 0, 0, LOG_FILE);
retVal = 1;
}
LogEvent(L"Chargen: Shutting connection down...", 0, 0, LOG_FILE);
if (ShutdownConnection(sock, FALSE))
{
LogEvent(L"Chargen: Connection is down", 0, 0, LOG_FILE);
}
else
{
LogEvent(L"Chargen: Connection shutdown failed", 0, 0, LOG_FILE);
retVal = 1;
}
LogEvent(L"Chargen: Terminating thread", 0, 0, LOG_FILE);
ExitThread(retVal);
}