400 lines
7.7 KiB
C++
400 lines
7.7 KiB
C++
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///////////////////////////////
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// File: tcp.cpp
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//
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// Description:
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// #include statements
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//
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#include <windows.h>
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#include <stdio.h>
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#include <winsock.h>
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#include "tcp.h"
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#include "util.h"
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#include "rw_common.h"
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#define RW_TCP_NOT_INITILIZED 0
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#define RW_TCP_INITILIZED 1
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#define RW_ICMP_NOT_INITILIZED 0
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#define RW_ICMP_INITILIZED 1
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static int siTcpStatus = RW_TCP_NOT_INITILIZED;
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static HINSTANCE hIcmp= NULL;
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static WSADATA wsa;
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int ResolveHostByThread(LPSTR pHost);
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int ResolveHostByAddrThread(LPSTR pHost);
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#define GET_HOST_TOUT (15 * 1000)
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#define PING_TOUT (15 * 1000)
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static struct hostent *gphostent= NULL;
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BOOL InitForTcp()
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{
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BOOL bRet= FALSE;
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if( siTcpStatus == RW_TCP_INITILIZED )
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return TRUE;
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if (! WSAStartup(0x0101, &wsa )) {
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siTcpStatus = RW_TCP_INITILIZED;
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bRet= TRUE;
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}
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return bRet;
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}
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BOOL InitForIcmp()
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{
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if(hIcmp)
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return TRUE;
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hIcmp = LoadLibrary( _T("ICMP.DLL") ); // Load ICMP.DLL and store globally
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if( ! hIcmp )
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{ // Whine if unable to load the DLL
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DisplayMessage("Unable to locate ICMP.DLL");
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return( FALSE );
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}
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return TRUE;
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}
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void CloseForTcpIcmp()
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{
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if (hIcmp)
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FreeLibrary(hIcmp); // When app is closed, free the ICMP DLL
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if(siTcpStatus == RW_TCP_INITILIZED)
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WSACleanup(); // And clean up sockets
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hIcmp = NULL;
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siTcpStatus = RW_TCP_NOT_INITILIZED;
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}
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//
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// Tries to get the host name and pings using ICMP
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// returns
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// RWZ_PINGSTATUS_NOTCPIP : if no socket library or get hostname fails
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// RWZ_PINGSTATUS_SUCCESS : if gethostname and ping is successful
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// RWZ_PINGSTATUS_FAIL : if gethostname is succesful and ping via icmp fails
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DWORD PingHost()
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{
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DWORD dwRet= 0;
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char szIPAddress[80];
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dwRet = RWZ_PINGSTATUS_NOTCPIP;
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if(!InitForTcp()) {
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return dwRet; // Tcp is not installed
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}
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memset(szIPAddress, '\0', 80);
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if (!gethostname(szIPAddress, 80))
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{
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if (Ping(szIPAddress)){
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dwRet = RWZ_PINGSTATUS_SUCCESS;
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}else {
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dwRet = RWZ_PINGSTATUS_FAIL;
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}
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}
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return dwRet;
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}
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BOOL Ping(LPSTR szIPAddress)
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{
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BOOL bRet= FALSE;
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if( !InitForIcmp())
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return bRet;
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if(!InitForTcp()) {
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return FALSE; // Tcp is not installed
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}
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static struct sockaddr_in saDestAddr;
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char szBuffer[64];
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DWORD *dwIPAddr, dwStatus;
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HANDLE hIP;
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struct hostent *phostent;
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PIP_ECHO_REPLY pIpe;
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if(!ResolveHostByThread(szIPAddress)) {
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gphostent = gethostbyname(szIPAddress);
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phostent = gphostent;
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}else {
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phostent= NULL;
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}
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if( ! phostent ){
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RW_DEBUG << "\n Resolving by Address " << flush;
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int iError;
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iError = 0;
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iError = WSAGetLastError ();
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RW_DEBUG << "\n Get Host By Name Error " << iError << flush;
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if(iError){
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WSASetLastError (0);
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//return 0;
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}
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saDestAddr.sin_addr.s_addr = inet_addr(szIPAddress);
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if( saDestAddr.sin_addr.s_addr !=INADDR_NONE ) {
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if(!ResolveHostByAddrThread((LPSTR)&saDestAddr.sin_addr.s_addr)) {
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gphostent = gethostbyaddr((LPSTR)&saDestAddr.sin_addr.s_addr,4, PF_INET) ;
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phostent = gphostent;
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}else {
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phostent= NULL;
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}
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}
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if(!phostent)
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{
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DisplayMessage(szIPAddress , "Unable to obtain an IP address for %s");
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return bRet;
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}
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}
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dwIPAddr = (DWORD *)( *phostent->h_addr_list );
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ICMPCREATEFILE pIcmpCreateFile;
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pIcmpCreateFile = (ICMPCREATEFILE) GetProcAddress(hIcmp, "IcmpCreateFile");
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if (NULL == pIcmpCreateFile)
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{
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DisplayMessage("IcmpCreateFile GetProc Error", "");
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return FALSE;
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}
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ICMPCLOSEHANDLE pIcmpCloseHandle;
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pIcmpCloseHandle = (ICMPCLOSEHANDLE) GetProcAddress(hIcmp, "IcmpCloseHandle");
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if (NULL == pIcmpCloseHandle)
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{
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DisplayMessage("IcmpCloseHandle GetProc Error", "");
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return bRet;
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}
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ICMPSENDECHO pIcmpSendEcho;
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pIcmpSendEcho = (ICMPSENDECHO) GetProcAddress(hIcmp, "IcmpSendEcho");
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if (NULL == pIcmpSendEcho)
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{
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DisplayMessage("IcmpSendEcho GetProc Error", "");
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return bRet;
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}
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if( ! pIcmpCreateFile || ! pIcmpCloseHandle || ! pIcmpSendEcho )
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{
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DisplayMessage("Unable to locate required API functions", "");
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return bRet;
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}
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hIP = pIcmpCreateFile();
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if( hIP == INVALID_HANDLE_VALUE )
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{
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DisplayMessage("Unable to open PING service");
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return bRet;
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}
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memset( szBuffer, '\xAA', 64 );
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pIpe = (PIP_ECHO_REPLY)LocalAlloc(LPTR, sizeof(IP_ECHO_REPLY) + 64);
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if (pIpe)
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{
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pIpe->Data = szIPAddress;
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pIpe->DataSize = 64;
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dwStatus = pIcmpSendEcho( hIP, *dwIPAddr, szBuffer, 64, NULL, pIpe,
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sizeof(IP_ECHO_REPLY) + 64, PING_TOUT );
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if(dwStatus)
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{
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bRet = TRUE;
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}
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LocalFree(pIpe);
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pIcmpCloseHandle(hIP);
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}
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return bRet;
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}
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BOOL CheckHostName(LPSTR szIISServer)
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{
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// WSAStartup() is already called
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if(!InitForTcp()) {
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return FALSE; // Tcp is not installed
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}
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struct hostent *phostent;
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if(!ResolveHostByThread(szIISServer)) {
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phostent = gphostent;
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}else {
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phostent= NULL;
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}
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if (phostent == NULL)
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return FALSE;
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else
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return TRUE;
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// WSACleanup() will be called later
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}
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//
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// Returns 1 if there is an Error
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// 0 if Successful
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DWORD GetHostThread(void *vp)
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{
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DWORD dwIsError=1;
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LPSTR szHost;
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szHost = (LPSTR) vp;
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int iError = 0;
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gphostent = gethostbyname(szHost);
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if( ! gphostent ){
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iError = WSAGetLastError ();
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if(iError) {
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WSASetLastError (0); // Reset the error
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}
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}
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else {
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dwIsError =0;
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}
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ExitThread(dwIsError);
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return dwIsError;
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}
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//
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// This function returns Calls the gethostbyname and
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// returns 0 if Successful and 1 if failure
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// the return
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//
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//
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int ResolveHostByThread(LPSTR pHost)
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{
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int iRet=0;
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DWORD dwThreadExitCode;
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DWORD dwCreationFlags=0; // Start CREATE_SUSPENDED
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DWORD ThreadId;
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RW_DEBUG << "\nResolve " << pHost << flush;
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HANDLE hParent = CreateThread(NULL,
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0,
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(LPTHREAD_START_ROUTINE) GetHostThread,
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(void *) pHost,
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dwCreationFlags,
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&ThreadId );
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DWORD dwRet = WaitForSingleObject(hParent,GET_HOST_TOUT);
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switch(dwRet) {
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case WAIT_ABANDONED :
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iRet = 1; // Error In Get Host Name
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break;
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case WAIT_OBJECT_0 :
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RW_DEBUG << "\n\tResolved ( 1 Error, 0 Ok) ";
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if( GetExitCodeThread(hParent,&dwThreadExitCode) ) {
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iRet = (int) dwThreadExitCode;
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}
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else {
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}
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RW_DEBUG << iRet;
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break;
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case WAIT_TIMEOUT :
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RW_DEBUG << "\n\t*** Error Resolving " << flush;
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iRet = 1; // Error In Get Host Name
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TerminateThread(hParent,0);
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break;
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default:
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break;
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}
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return iRet;
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}
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//
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// Returns 1 if there is an Error
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// 0 if Successful
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DWORD GetHostByAddrThread(void *vp)
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{
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DWORD dwIsError=1;
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LPSTR szAddr;
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int iError = 0;
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szAddr = (LPSTR) vp;
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gphostent = gethostbyaddr(szAddr,
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4, PF_INET) ;
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if( ! gphostent ){
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iError = WSAGetLastError ();
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if(iError) {
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WSASetLastError (0); // Reset the error
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}
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}
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else {
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dwIsError =0;
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}
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return dwIsError;
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}
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//
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// This function returns Calls the gethostbyaddr and
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// returns 0 if Successful and 1 if failure
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// the return
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//
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//
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int ResolveHostByAddrThread(LPSTR pHost)
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{
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int iRet=0;
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DWORD dwThreadExitCode;
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DWORD dwCreationFlags=0; // Start CREATE_SUSPENDED
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DWORD ThreadId;
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RW_DEBUG << "\nResolve " << pHost << " By Address " << flush;
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HANDLE hParent = CreateThread(NULL,
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0,
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(LPTHREAD_START_ROUTINE) GetHostByAddrThread,
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(void *) pHost,
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dwCreationFlags,
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&ThreadId );
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DWORD dwRet = WaitForSingleObject(hParent,GET_HOST_TOUT);
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switch(dwRet) {
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case WAIT_ABANDONED :
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iRet = 1; // Error In Get Host Name
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break;
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case WAIT_OBJECT_0 :
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RW_DEBUG << "\n\tResolved ( 1 Error, 0 Ok) ";
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if( GetExitCodeThread(hParent,&dwThreadExitCode) ) {
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iRet = (int) dwThreadExitCode;
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}
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else {
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}
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RW_DEBUG << iRet << flush;
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break;
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case WAIT_TIMEOUT :
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RW_DEBUG << "\n\t*** Error Resolving " << flush;
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iRet = 1; // Error In Get Host Name
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TerminateThread(hParent,0);
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break;
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default:
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break;
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}
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return iRet;
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}
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