www.pudn.com > PIPMasq.zip > util.cpp

#include "stdafx.h" 
#include "PIPMasq.h" 
 
 
// Don't forget the following next two lines before using this function 
//		WSADATA			Data; 
//		int status = WSAStartup(MAKEWORD(1,1), &Data); 
bool 
_hostnameToDotIP(const char *IPAddr, char *dotIP) 
{ 
	memset(dotIP, 0, 16); 
	 
	struct in_addr iaHost; 
	LPHOSTENT lpHostEntry; 
	struct in_addr *pinAddr; 
 
	iaHost.s_addr = inet_addr(IPAddr); 
	if (iaHost.s_addr == INADDR_NONE) 
	{ 
		lpHostEntry = gethostbyname(IPAddr); 
		if (lpHostEntry == NULL) 
			return false; 
 
		pinAddr = (LPIN_ADDR)lpHostEntry->h_addr_list[0]; 
 
		memcpy(dotIP, inet_ntoa(*pinAddr), 16); 
	} 
	else 
	{ 
		memcpy(dotIP, IPAddr, 16);		 
	} 
 
	return true; 
} 
 
 
// Don't forget the following next two lines before using this function 
//		WSADATA			Data; 
//		int status = WSAStartup(MAKEWORD(1,1), &Data); 
// This function is a reverse function of inet_addr 
bool 
rev_inet_addr(__u32 netByteIPAddr32, char *dotIP) 
{ 
	memset(dotIP, 0, 16); 
	 
	struct in_addr	addr; 
	addr.s_addr = netByteIPAddr32; 
 
	memcpy(dotIP, inet_ntoa(addr), 16);  
	return true; 
} 
 
 
bool  
double_start_check(void) 
{ 
	// Create mutex 
	 
	HANDLE hMutex; 
	hMutex = CreateMutex(NULL, TRUE, "DSC4PIPMasq"); 
	 
	if (!hMutex) 
		return FALSE; 
	 
	// If GetLastError() returns ERROR_ALREADY_EXISTS, 
	// another PIPMasq has already started. 
 
	if (GetLastError() == ERROR_ALREADY_EXISTS) 
		return false; 
 
	return true; 
}