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twinsock.c
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twinsock.c
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/*
* TwinSock - "Troy's Windows Sockets"
*
* Copyright (C) 1994 Troy Rollo <troy@cbme.unsw.EDU.AU>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the license in the file LICENSE.TXT included
* with the TwinSock distribution.
*
* 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.
*/
#include <winsock.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "twinsock.h"
#include "tx.h"
#include "script.h"
#include "sockinfo.h"
typedef struct __tws_request
{
short idRequest;
long iSender;
short idSenderRequest;
struct __tws_request *prqNext;
} tws_request;
typedef struct __tws_socket
{
tws_sockinfo si;
long iOwner;
struct __tws_socket *psckNext;
} tws_socket;
short iRequestOut = 0;
tws_request *prqList = 0;
tws_request **pprqTail = &prqList;
tws_socket *psckList = 0;
tws_socket **ppsckTail = &psckList;
HINSTANCE hinst;
static BOOL bUseNotify = TRUE;
static void SendInitRequest(void);
void Shutdown(void);
void OpenPort(void);
BOOL ResolvEdit(HWND hwndParent);
extern int iPortChanged;
static int iBufferSize;
#define READ_MAX 1024
#define TIMER_ID_SEND 1
#define TIMER_ID_RECEIVE 2
#define TIMER_ID_FLUSH 3
#define TIMER_ID_BREAK 4
#define TIMER_ID_COMMCHECK 5
#define TIMER_ID_SCRIPT 6
#define READ_COMPLETED (WM_USER + 1000)
#define WRITE_COMPLETED (WM_USER + 1001)
#ifdef __FLAT__
static HANDLE idComm;
#else
static int idComm;
#endif
static HWND hwnd;
static BOOL bFlushing = FALSE;
static BOOL bTerminal = TRUE;
#define SCREEN_COLUMNS 80
#define SCREEN_ROWS 25
static char aachScreen[SCREEN_ROWS][SCREEN_COLUMNS];
static int iScrollRow = 0;
static int iRow = 0, iColumn = 0;
static int cyRow, cxColumn;
#define ROW_INDEX(x) ((x + iScrollRow) % SCREEN_ROWS)
static char const achProtoInit[] = "@$TSStart$@";
extern enum Encoding eLine;
static int iInitChar = 0;
static char *pchCollect = 0;
static char *pchCollEnd = 0;
long nDiscarded = 0;
long nBytesRecvd = 0;
#ifdef __FLAT__
char *
GetLastErrorText(void)
{
char *pchError;
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,
0,
GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR) &pchError,
0, 0);
return pchError;
}
#endif
u_short CALLBACK htons (u_short hostshort)
{
char *pchValue = (char *) &hostshort;
char c;
c = pchValue[0];
pchValue[0] = pchValue[1];
pchValue[1] = c;
return hostshort;
}
u_long CALLBACK htonl (u_long hostlong)
{
char *pchValue = (char *) &hostlong;
char c;
c = pchValue[0];
pchValue[0] = pchValue[3];
pchValue[3] = c;
c = pchValue[1];
pchValue[1] = pchValue[2];
pchValue[2] = c;
return hostlong;
}
u_short CALLBACK ntohs (u_short netshort)
{
char *pchValue = (char *) &netshort;
char c;
c = pchValue[0];
pchValue[0] = pchValue[1];
pchValue[1] = c;
return netshort;
}
u_long CALLBACK ntohl (u_long netlong)
{
char *pchValue = (char *) &netlong;
char c;
c = pchValue[0];
pchValue[0] = pchValue[3];
pchValue[3] = c;
c = pchValue[1];
pchValue[1] = pchValue[2];
pchValue[2] = c;
return netlong;
}
extern void PacketReceiveData(void *pvData, int iLen);
void SetTransmitTimeout(void)
{
KillTimer(hwnd, TIMER_ID_SEND);
SetTimer(hwnd, TIMER_ID_SEND, 10000, 0);
}
void KillTransmitTimeout(void)
{
KillTimer(hwnd, TIMER_ID_SEND);
}
void SetReceiveTimeout(void)
{
KillTimer(hwnd, TIMER_ID_RECEIVE);
SetTimer(hwnd, TIMER_ID_RECEIVE, 1500, 0);
}
void KillReceiveTimeout(void)
{
KillTimer(hwnd, TIMER_ID_RECEIVE);
}
void FlushInput(void)
{
KillTimer(hwnd, TIMER_ID_FLUSH);
bFlushing = TRUE;
SetTimer(hwnd, TIMER_ID_FLUSH, 1500, 0);
}
void
SendToScreen(char c)
{
RECT rcClient;
RECT rcRedraw;
if (c == '\r')
{
iColumn = 0;
}
else if (c == '\b')
{
if (iColumn > 0)
iColumn--;
}
else if (c == '\n')
{
if (iRow < SCREEN_ROWS - 1)
{
iRow++;
}
else
{
memset(aachScreen[iScrollRow], 0x20, sizeof(aachScreen[iScrollRow]));
iScrollRow++;
while (iScrollRow >= SCREEN_ROWS)
iScrollRow -= SCREEN_ROWS;
GetClientRect(hwnd, &rcClient);
ScrollWindow(hwnd, 0, -cyRow, &rcClient, 0);
UpdateWindow(hwnd);
}
}
else if (c >= 0x20 && c <= 0x7e)
{
aachScreen[ROW_INDEX(iRow)][iColumn] = c;
rcRedraw.top = iRow * cyRow;
rcRedraw.left = iColumn * cxColumn;
rcRedraw.bottom = rcRedraw.top + cyRow;
rcRedraw.right = rcRedraw.left + cxColumn;
InvalidateRect(hwnd, &rcRedraw, TRUE);
if (iColumn < SCREEN_COLUMNS - 1)
iColumn++;
}
}
static void
WriteToScreen(char *pch, int iBytes)
{
while (iBytes--)
SendToScreen(*pch++);
}
static void
FillResolverInfo(void)
{
static char achBuffer[256];
GetTwinSockSetting("Resolver", "Override", "0", achBuffer, sizeof(achBuffer));
if (*hostinfo.achDomainName &&
hostinfo.nHosts &&
achBuffer[0] == '0')
return;
GetTwinSockSetting("Resolver", "Domain", "", achBuffer, sizeof(achBuffer));
if (*achBuffer)
strcpy(hostinfo.achDomainName, achBuffer);
else if (!hostinfo.achDomainName)
strcpy(hostinfo.achDomainName, "no-domain-specified");
GetTwinSockSetting("Resolver", "Server1", "", achBuffer, sizeof(achBuffer));
if (*achBuffer)
{
strcpy(hostinfo.aachHosts[0], achBuffer);
hostinfo.nHosts = 1;
}
else
{
if (!hostinfo.nHosts)
{
strcpy(hostinfo.aachHosts[0], "127.0.0.1");
hostinfo.nHosts++;
}
return;
}
GetTwinSockSetting("Resolver", "Server2", "", achBuffer, sizeof(achBuffer));
if (*achBuffer)
{
strcpy(hostinfo.aachHosts[1], achBuffer);
hostinfo.nHosts = 2;
}
else
{
return;
}
GetTwinSockSetting("Resolver", "Server3", "", achBuffer, sizeof(achBuffer));
if (*achBuffer)
{
strcpy(hostinfo.aachHosts[2], achBuffer);
hostinfo.nHosts = 3;
}
else
{
return;
}
}
static void
AddChar(char c)
{
static BOOL bStillCollect = FALSE;
SendToScreen(c);
if (pchCollect &&
pchCollect != pchCollEnd &&
c != ':' && c != '#' && c != '*' && c != '$' && c != '@')
{
*pchCollect++ = c;
*pchCollect = 0;
bStillCollect = TRUE;
return;
}
else if (c == achProtoInit[iInitChar])
{
iInitChar++;
if (iInitChar == strlen(achProtoInit))
{
FillResolverInfo();
if (*hostinfo.achHostName &&
!strchr(hostinfo.achHostName, '.'))
{
strcat(hostinfo.achHostName, ".");
strcat(hostinfo.achHostName,
hostinfo.achDomainName);
}
WriteToScreen("\r\nStarting Protocol, host=", 27);
WriteToScreen(hostinfo.achHostName, strlen(hostinfo.achHostName));
WriteToScreen("\r\n", 2);
iInitChar = 0;
bTerminal = 0;
InitProtocol();
SendInitRequest();
}
}
else if (iInitChar == 9 && isdigit(c))
{
eLine = (enum Encoding) (c - '0');
}
else if (iInitChar == 9 && c == '#')
{
pchCollect = hostinfo.achDomainName;
pchCollEnd = pchCollect + sizeof(hostinfo.achDomainName) - 1;
bStillCollect = TRUE;
}
else if (iInitChar == 9 && c == ':')
{
pchCollect = hostinfo.achHostName;
pchCollEnd = pchCollect + sizeof(hostinfo.achHostName) - 1;
bStillCollect = TRUE;
}
else if (iInitChar == 9 && c == '*' && hostinfo.nHosts < 4)
{
pchCollect = hostinfo.aachHosts[hostinfo.nHosts++];
pchCollEnd = pchCollect + sizeof(hostinfo.aachHosts[0]) - 1;
bStillCollect = TRUE;
}
else if (iInitChar)
{
iInitChar = 0;
eLine = E_6Bit;
}
if (!bStillCollect)
pchCollect = 0;
CheckScripts(hwnd, c);
}
static void
ProcessReceivedData(char *pchBuffer,
int nRead)
{
int i;
if (bTerminal)
{
HideCaret(hwnd);
for (i = 0; i < nRead; i++)
AddChar(pchBuffer[i]);
SetCaretPos(iColumn * cxColumn, iRow * cyRow);
ShowCaret(hwnd);
}
else if (bFlushing)
{
nDiscarded += nRead;
FlushInput();
}
else
{
nBytesRecvd += nRead;
PacketReceiveData(pchBuffer, nRead);
}
}
#ifdef __FLAT__
static char achReadBuffer[2048];
static DWORD dwRead;
static DWORD dwWrite;
static OVERLAPPED olRead;
static OVERLAPPED olWrite;
static HANDLE heventRead = 0;
static HANDLE heventWrite = 0;
static void PrepareToRead(void);
#pragma argsused
static void
ReceiveCompleted(void)
{
ProcessReceivedData(achReadBuffer, (int) dwRead);
PrepareToRead();
}
static void
PrepareToRead(void)
{
olRead.Internal = olRead.InternalHigh = olRead.Offset = olRead.OffsetHigh = 0;
olRead.hEvent = heventRead;
while (ReadFile(idComm,
achReadBuffer, sizeof(achReadBuffer),
&dwRead, &olRead));
if (GetLastError() != ERROR_IO_PENDING)
{
char *pchError = GetLastErrorText();
MessageBox(hwnd, pchError, "Fatal error reading communications port", MB_OK);
if (pchError)
LocalFree(pchError);
}
}
#else
static void DoReading(void)
{
static char achBuffer[READ_MAX];
static BOOL bAlreadyHere = FALSE;
int nRead;
COMSTAT cs;
int i;
if (bAlreadyHere)
return;
bAlreadyHere = TRUE;
do
{
nRead = ReadComm(idComm, achBuffer, READ_MAX);
if (nRead <= 0)
{
GetCommError(idComm, &cs);
nRead = -nRead;
}
if (nRead)
{
ProcessReceivedData(achBuffer, nRead);
}
} while (nRead || cs.cbInQue);
bAlreadyHere = FALSE;
}
#endif
#ifdef __FLAT__
typedef struct __tws_outdata
{
char *pchWrite;
int nWrite;
struct __tws_outdata *podNext;
} tws_outdata;
static tws_outdata *podList = 0, **ppodTail = &podList;
static BOOL bWaiting = FALSE;
void
AddToDataQueue(void *pvData, int iDataLen)
{
tws_outdata *podNow = (tws_outdata *) malloc(sizeof(tws_outdata));
*ppodTail = podNow;
ppodTail = &podNow->podNext;
podNow->pchWrite = (char *) malloc(iDataLen);
memcpy(podNow->pchWrite, pvData, iDataLen);
podNow->nWrite = iDataLen;
podNow->podNext = 0;
}
#pragma argsused
void WINAPI
SendCompleted( void)
{
tws_outdata *pod;
while (podList)
{
pod = podList;
podList = podList->podNext;
if (!podList)
ppodTail = &podList;
olWrite.Internal = olWrite.InternalHigh = olWrite.Offset = olWrite.OffsetHigh = 0;
olWrite.hEvent = heventWrite;
if (!WriteFile(idComm, pod->pchWrite, pod->nWrite, &dwWrite, &olWrite))
{
if (GetLastError() != ERROR_IO_PENDING)
{
char *pchError = GetLastErrorText();
MessageBox(hwnd, pchError, "Fatal error writing communications port", MB_OK);
if (pchError)
LocalFree(pchError);
}
free(pod->pchWrite);
free(pod);
return;
}
free(pod->pchWrite);
free(pod);
}
bWaiting = FALSE;
}
int SendData(void *pvData, int iDataLen)
{
if (bFlushing)
return iDataLen; /* Lie */
if (bWaiting)
{
AddToDataQueue(pvData, iDataLen);
return iDataLen;
}
olWrite.Internal = olWrite.InternalHigh = olWrite.Offset = olWrite.OffsetHigh = 0;
olWrite.hEvent = heventWrite;
if (!WriteFile(idComm, pvData, iDataLen, &dwWrite, &olWrite))
{
if (GetLastError() != ERROR_IO_PENDING)
{
char *pchError = GetLastErrorText();
MessageBox(hwnd, pchError, "Fatal error writing communications port", MB_OK);
if (pchError)
LocalFree(pchError);
}
else
{
bWaiting = TRUE;
}
}
return iDataLen;
}
#else
int SendData(void *pvData, int iDataLen)
{
int nWritten;
COMSTAT cs;
int iLen;
if (bFlushing)
return iDataLen; /* Lie */
iLen = iDataLen;
do
{
/* If the write would overflow the buffer, pretend we wrote it OK
* and return immediately
*/
GetCommError(idComm, &cs);
if (cs.cbOutQue + iLen >= iBufferSize)
return iDataLen;
nWritten = WriteComm(idComm, pvData, iLen);
if (nWritten < 0)
{
GetCommError(idComm, &cs);
nWritten = -nWritten;
}
iLen -= nWritten;
pvData = (char *) pvData + nWritten;
} while (iLen);
return iDataLen;
}
#endif
#ifdef __FLAT__
static HANDLE hThread = 0;
static DWORD dwThreadID;
#pragma argsused
DWORD
CommsReader(LPDWORD lpdwParam)
{
DWORD dwEvents;
HANDLE ahEvents[2];
ahEvents[0] = heventRead;
ahEvents[1] = heventWrite;
while (1)
{
switch(WaitForMultipleObjects(2, ahEvents, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
GetOverlappedResult(idComm, &olRead, &dwRead, TRUE);
ResetEvent(heventRead);
PostMessage(hwnd, READ_COMPLETED, 0, 0);
break;
case WAIT_OBJECT_0 + 1:
GetOverlappedResult(idComm, &olWrite, &dwWrite, TRUE);
ResetEvent(heventWrite);
PostMessage(hwnd, WRITE_COMPLETED, 0, 0);
break;
}
}
}
void
StopCommThread(void)
{
if (hThread)
{
CloseHandle(hThread);
hThread = 0;
}
}
void
StartCommThread(void)
{
StopCommThread();
if (!heventRead)
heventRead = CreateEvent(0, TRUE, 0, 0);
if (!heventWrite)
heventWrite = CreateEvent(0, TRUE, 0, 0);
hThread = CreateThread( 0,
8192,
(LPTHREAD_START_ROUTINE) CommsReader,
0,
0,
&dwThreadID);
}
#endif
void
PaintScreen( HWND hWnd)
{
int i, iRow;
int iCol;
TEXTMETRIC tm;
HFONT hfontOld;
HFONT hfontFixed;
PAINTSTRUCT ps;
int yPos;
BeginPaint(hWnd, &ps);
hfontFixed = (HFONT) GetStockObject(SYSTEM_FIXED_FONT);
hfontOld = (HFONT) SelectObject(ps.hdc, (HGDIOBJ) hfontFixed);
GetTextMetrics(ps.hdc, &tm);
for (i = 0; i < SCREEN_ROWS; i++)
{
iRow = ROW_INDEX(i);
TextOut(ps.hdc, 0, i * cyRow, aachScreen[iRow], SCREEN_COLUMNS);
}
SelectObject(ps.hdc, (HGDIOBJ) hfontOld);
EndPaint(hWnd, &ps);
}
LRESULT CALLBACK _export
WindowProc( HWND hWnd,
UINT wMsg,
WPARAM wParam,
LPARAM lParam)
{
char c;
switch(wMsg)
{
case WM_SYSCOMMAND:
CheckScriptSysCommands(hWnd, wParam, lParam);
break;
case WM_COMMAND:
if (CheckScriptCommands(hWnd, wParam, &bTerminal))
break;
switch(wParam)
{
case 100:
if (CommsEdit(hWnd))
{
if (iPortChanged)
{
#ifdef __FLAT__
StopCommThread();
CloseHandle(idComm);
#else
CloseComm(idComm);
#endif
OpenPort();
}
else
{
InitComm(idComm);
}
}
break;
case 102:
if (!bTerminal)
{
Shutdown();
SendData("\030\030\030\030\030", 5);
}
break;
case 103:
PostQuitMessage(0);
break;
case 104:
if (bTerminal)
{
SetCommBreak(idComm);
SetTimer(hwnd, TIMER_ID_BREAK, 1500, 0);
}
break;
case 105:
if (bTerminal)
DialNumber(hWnd);
break;
case 106:
if (!bTerminal)
ShowProtoInfo(hWnd);
break;
case 107:
if (bTerminal)
ResolvEdit(hWnd);
break;
case 201:
About(hWnd);
break;
case 301:
WinHelp(hWnd, "TWINSOCK.HLP", HELP_CONTENTS, 0);
break;
}
break;
#ifdef __FLAT__
case READ_COMPLETED:
ReceiveCompleted();
break;
case WRITE_COMPLETED:
SendCompleted();
break;
#else
case WM_COMMNOTIFY:
switch(LOWORD(lParam))
{
case CN_RECEIVE:
DoReading();
break;
}
break;
#endif
case WM_CHAR:
PerhapsKillScript(hWnd);
if (bTerminal)
{
c = wParam;
SendData(&c, 1);
}
break;
case WM_TIMER:
switch(wParam)
{
case TIMER_ID_SEND:
TimeoutReceived();
break;
case TIMER_ID_RECEIVE:
KillTimer(hWnd, TIMER_ID_RECEIVE);
PacketReceiveData(0, 0);
break;
case TIMER_ID_FLUSH:
KillTimer(hWnd, TIMER_ID_FLUSH);
bFlushing = FALSE;
break;
case TIMER_ID_BREAK:
ClearCommBreak(idComm);
KillTimer(hWnd, TIMER_ID_BREAK);
break;
#ifndef __FLAT__
case TIMER_ID_COMMCHECK:
DoReading();
break;
#endif
case TIMER_ID_SCRIPT:
ScriptTimeOut(hWnd);
break;
}
break;
case WM_PAINT:
PaintScreen(hWnd);
return 0;
case WM_SETFOCUS:
CreateCaret(hWnd, 0, cxColumn, cyRow);
SetCaretPos(iColumn * cxColumn, iRow * cyRow);
ShowCaret(hWnd);
break;
case WM_KILLFOCUS:
DestroyCaret();
break;
case WM_CLOSE:
PostQuitMessage(0);
break;
}
return DefWindowProc(hWnd, wMsg, wParam, lParam);
}
/* Process data received from a client */
#pragma argsused
void
ResponseReceived( char *pchData,
int iSize,
long iFrom)
{
struct tx_request *ptxr = (struct tx_request *) pchData;
tws_request *prq;
tws_socket *psck, **ppsck;
enum Functions ft;
int i;
char *c;
prq = (tws_request *) malloc(sizeof(tws_request));
prq->prqNext = 0;
prq->idRequest = iRequestOut++;;
prq->iSender = iFrom;
prq->idSenderRequest = ntohs(ptxr->id);
*pprqTail = prq;
pprqTail = &prq->prqNext;
ptxr->id = htons(prq->idRequest);
ft = (enum Functions) ntohs(ptxr->iType);
if (HasSocketArg(ft))
{
/* If this is a socket call, we need to create an entry
* for the new socket
*/
if (ft == FN_Socket)
{
c = ptxr->pchData;
if (ntohs(*(short *) (c + 2)) == 2)
i = ntohs(*(short *) (c + 4));
else
i = (short) ntohl(*(long *) (c + 4));
if (i != -1)
{
psck = (tws_socket *) malloc(sizeof(tws_socket));
psck->iOwner = iFrom;
psck->si.iClientSocket = i;
psck->si.iServerSocket = GetClientSocket();
psck->psckNext = 0;
*ppsckTail = psck;
ppsckTail = &psck->psckNext;
}
}
/* Now change the client's idea of the socket number into
* our idea of the socket number.
*/
c = ptxr->pchData;
if (ntohs(*(short *) (c + 2)) == 2)
i = ntohs(*(short *) (c + 4));
else
i = (short) ntohl(*(long *) (c + 4));
for (psck = psckList;
psck->si.iClientSocket != i || psck->iOwner != iFrom;
psck = psck->psckNext);
i = psck->si.iServerSocket;
if (ntohs(*(short *) (c + 2)) == 2)
*(short *) (c + 4) = htons(i);
else
*(long *) (c + 4) = htonl(i);
}
PacketTransmitData(pchData, iSize, 0);
#ifndef __FLAT__
DoReading();
#endif
}
long
AdjustDataIn( struct tx_request *ptxr,
enum Functions ft)
{
tws_socket *psck;
short idRequest;
long iOwner;
int i;
BOOL bLong;
char *c;
idRequest = ntohs(ptxr->id);
for (psck = psckList;
psck && psck->si.iServerSocket != idRequest;
psck = psck->psckNext);
if (!psck)
return 0;
iOwner = psck->iOwner;
ptxr->id = htons(psck->si.iClientSocket);
if (ft == FN_Accept)
{
if (ntohs(ptxr->nLen) ==
sizeof(struct sockaddr_in) +
sizeof(short) * 6)
i = ntohs(*(short *) (ptxr->pchData +
sizeof(struct sockaddr_in)));
else
i = (int) ntohl(*(long *) (ptxr->pchData +
sizeof(struct sockaddr_in)));
psck = (tws_socket *) malloc(sizeof(tws_socket));
psck->iOwner = iOwner;
/* Because this one is allocated by tshost, and is unique over the
* range of all applications using TwinSock, we can use it both ways
* as is
*/
psck->si.iServerSocket = i;
psck->si.iClientSocket = i;
psck->psckNext = 0;
*ppsckTail = psck;
ppsckTail = &psck->psckNext;
}
return iOwner;
}
long
AdjustRequestIn(struct tx_request *ptxr,
enum Functions ft)
{
short idRequest;
long iSender;
tws_request **pprq, *prqTemp;
tws_socket **ppsck, *psck;
int i;
char *c;
idRequest = ntohs(ptxr->id);
for (pprq = &prqList;
*pprq && (*pprq)->idRequest != idRequest;
pprq = &(*pprq)->prqNext);
if (!*pprq)
return 0;
iSender = (*pprq)->iSender;
ptxr->id = htons((*pprq)->idSenderRequest);
prqTemp = (*pprq)->prqNext;
free(*pprq);
*pprq = prqTemp;
if (!prqTemp)
pprqTail = pprq;
if (HasSocketArg(ft))
{
c = ptxr->pchData;
if (ntohs(*(short *) (c + 2)) == 2)
i = ntohs(*(short *) (c + 4));
else
i = (short) ntohl(*(long *) (c + 4));
for (psck = psckList;
psck && psck->si.iServerSocket != i;
psck = psck->psckNext);
if (psck)
{
i = psck->si.iClientSocket;
if (ntohs(*(short *) (c + 2)) == 2)
*(short *) (c + 4) = htons(i);
else
*(long *) (c + 4) = htonl(i);
}
/* If this is a close call, remove our entry describing the
* socket.
*/
if (ft == FN_Close)
{
c = ptxr->pchData;
if (ntohs(*(short *) (c + 2)) == 2)