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vc++网络安全编程范例(20)木马防范检测数据端口与进程

2012-01-07

我们进行系统安防的时候,需要防范木马,木马的存在就有网络连接,我们检测数据端口与进程的模式来防范木马。我们来用VC++实现检测数据端口与进程,请见代码实现与注释讲解#include <windows.h>#include <Tlhe...

我们进行系统安防的时候,需要防范木马,木马的存在就有网络连接,我们检测数据端口与进程的模式来防范木马。

我们来用VC++实现检测数据端口与进程,请见代码实现与注释讲解

#include <windows.h>
#include <Tlhelp32.h>
#include <winsock.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")

//---------------------------------------------------------------------------
// 以下为与TCP相关的结构.
typedef struct tagMIB_TCPEXROW{
DWORD dwState; // 连接状态.
DWORD dwLocalAddr; // 本地计算机地址.
DWORD dwLocalPort; // 本地计算机端口.
DWORD dwRemoteAddr; // 远程计算机地址.
DWORD dwRemotePort; // 远程计算机端口.
DWORD dwProcessId;
} MIB_TCPEXROW, *PMIB_TCPEXROW;

typedef struct tagMIB_TCPEXTABLE{
DWORD dwNumEntries;
MIB_TCPEXROW table[100]; // 任意大小数组变量.
} MIB_TCPEXTABLE, *PMIB_TCPEXTABLE;

//---------------------------------------------------------------------------
// 以下为与UDP相关的结构.
typedef struct tagMIB_UDPEXROW{
DWORD dwLocalAddr; // 本地计算机地址.
DWORD dwLocalPort; // 本地计算机端口.
DWORD dwProcessId;
} MIB_UDPEXROW, *PMIB_UDPEXROW;

typedef struct tagMIB_UDPEXTABLE{
DWORD dwNumEntries;
MIB_UDPEXROW table[100]; // 任意大小数组变量.
} MIB_UDPEXTABLE, *PMIB_UDPEXTABLE;

//---------------------------------------------------------------------------
// 所用的iphlpapi.dll中的函数原型定义.
typedef DWORD (WINAPI *PALLOCATE_AND_GET_TCPEXTABLE_FROM_STACK)(
PMIB_TCPEXTABLE *pTcpTable, // 连接表缓冲区.
BOOL bOrder,
HANDLE heap,
DWORD zero,
DWORD flags
);

typedef DWORD (WINAPI *PALLOCATE_AND_GET_UDPEXTABLE_FROM_STACK)(
PMIB_UDPEXTABLE *pUdpTable, // 连接表缓冲区.
BOOL bOrder,
HANDLE heap,
DWORD zero,
DWORD flags
);

static PALLOCATE_AND_GET_TCPEXTABLE_FROM_STACK
pAllocateAndGetTcpExTableFromStack = NULL;

static PALLOCATE_AND_GET_UDPEXTABLE_FROM_STACK
pAllocateAndGetUdpExTableFromStack = NULL;

//---------------------------------------------------------------------------
//
// 可能的TCP 端点状态.
//
static char TcpState[][32] = {
TEXT("???"),
TEXT("CLOSED"),
TEXT("LISTENING"),
TEXT("SYN_SENT"),
TEXT("SYN_RCVD"),
TEXT("ESTABLISHED"),
TEXT("FIN_WAIT1"),
TEXT("FIN_WAIT2"),
TEXT("CLOSE_WAIT"),
TEXT("CLOSING"),
TEXT("LAST_ACK"),
TEXT("TIME_WAIT"),
TEXT("DELETE_TCB")
};

//---------------------------------------------------------------------------
//
// 生成IP地址字符串.
//
PCHAR GetIP(unsigned int ipaddr)
{
static char pIP[20];
unsigned int nipaddr = htonl(ipaddr);
sprintf(pIP, "%d.%d.%d.%d",
(nipaddr >>24) &0xFF,
(nipaddr>>16) &0xFF,
(nipaddr>>8) &0xFF,
(nipaddr)&0xFF);
return pIP;
}

//---------------------------------------------------------------------------
//
// 由进程号获得全程文件名.
//
char* ProcessPidToName(DWORD ProcessId)
{
HANDLE hProcessSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
PROCESSENTRY32 processEntry = { 0 };
processEntry.dwSize = sizeof(PROCESSENTRY32);
static char ProcessName[256];

lstrcpy(ProcessName, "Idle");
if (hProcessSnap == INVALID_HANDLE_VALUE)
return ProcessName;

BOOL bRet=Process32First(hProcessSnap, &processEntry);

while(bRet)
{
if (processEntry.th32ProcessID == ProcessId)
{
MODULEENTRY32 me32 = {0};
me32.dwSize = sizeof(MODULEENTRY32);
HANDLE hModuleSnap = CreateToolhelp32Snapshot
(TH32CS_SNAPMODULE, processEntry.th32ProcessID);

Module32First(hModuleSnap, &me32); // 获得全程路径.
lstrcpy(ProcessName, me32.szExePath);
CloseHandle(hProcessSnap);
return ProcessName;
}

bRet=Process32Next(hProcessSnap, &processEntry);
}

CloseHandle(hProcessSnap);
return ProcessName;
}

//---------------------------------------------------------------------------
//
// 显示进程、端口和文件名之间的关联.
//
void DisplayPort()
{
DWORD i;
PMIB_TCPEXTABLE TCPExTable;
PMIB_UDPEXTABLE UDPExTable;
char szLocalAddress[256];
char szRemoteAddress[256];

if(pAllocateAndGetTcpExTableFromStack(
&TCPExTable, TRUE, GetProcessHeap(), 2, 2))
{
printf("AllocateAndGetTcpExTableFromStack Error!\n");
return;
}

if(pAllocateAndGetUdpExTableFromStack
(&UDPExTable, TRUE, GetProcessHeap(), 2, 2 ))
{
printf("AllocateAndGetUdpExTableFromStack Error!.\n");
return;
}

// 获得TCP列表.
printf("%-6s%-22s%-22s%-11s%s\n",
TEXT("Proto"),
TEXT("Local Address"),
TEXT("Foreign Address"),
TEXT("State"),
TEXT("Process"));

for( i = 0; i <TCPExTable->dwNumEntries; i++ )
{
sprintf( szLocalAddress, "%s:%d",
GetIP(TCPExTable->table[i].dwLocalAddr),
htons( (WORD) TCPExTable->table[i].dwLocalPort));

sprintf( szRemoteAddress, "%s:%d",
GetIP(TCPExTable->table[i].dwRemoteAddr),
htons((WORD)TCPExTable->table[i].dwRemotePort));

printf("%-6s%-22s%-22s%-11s%s:%d\n", TEXT("TCP"),
szLocalAddress, szRemoteAddress,
TcpState[TCPExTable->table[i].dwState],
ProcessPidToName(TCPExTable->table[i].dwProcessId),
TCPExTable->table[i].dwProcessId);
}

// 获得UDP列表.
for( i = 0; i < UDPExTable->dwNumEntries; i++ )
{
sprintf( szLocalAddress, "%s:%d",
GetIP(UDPExTable->table[i].dwLocalAddr),
htons((WORD)UDPExTable->table[i].dwLocalPort));

sprintf( szRemoteAddress, "%s","*:*");

printf("%-6s%-22s%-33s%s:%d\n", TEXT("UDP"),
szLocalAddress, szRemoteAddress,
ProcessPidToName(UDPExTable->table[i].dwProcessId),
UDPExTable->table[i].dwProcessId);
}
}

//---------------------------------------------------------------------------
//
// 进程与端口关联程序的主函数.
//
void main()
{
WSADATA WSAData;
if( WSAStartup(MAKEWORD(1, 1), &WSAData ))
{
printf("WSAStartup error!\n");
return;
}

HMODULE hIpDLL = LoadLibrary( "iphlpapi.dll");
if ( !hIpDLL)
return;

pAllocateAndGetTcpExTableFromStack =
(PALLOCATE_AND_GET_TCPEXTABLE_FROM_STACK)
GetProcAddress( hIpDLL, "AllocateAndGetTcpExTableFromStack");

pAllocateAndGetUdpExTableFromStack =
(PALLOCATE_AND_GET_UDPEXTABLE_FROM_STACK)
GetProcAddress(hIpDLL, "AllocateAndGetUdpExTableFromStack" );

// 显示进程与端口关联.
DisplayPort();

FreeLibrary(hIpDLL);
WSACleanup();

getchar(); // 暂停.
}

作者 yincheng01
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