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Packet32.cpp
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Packet32.cpp
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/***********************IMPORTANT NPCAP LICENSE TERMS***********************
*
* Npcap (https://npcap.com) is a Windows packet sniffing driver and library and
* is copyright (c) 2013-2023 by Nmap Software LLC ("The Nmap Project"). All
* rights reserved.
*
* Even though Npcap source code is publicly available for review, it is not
* open source software and may not be redistributed or used in other software
* without special permission from the Nmap Project. The standard (free) version
* is usually limited to installation on five systems. For more details, see the
* LICENSE file included with Npcap and also available at
* https://github.com/nmap/npcap/blob/master/LICENSE. This header file
* summarizes a few important aspects of the Npcap license, but is not a
* substitute for that full Npcap license agreement.
*
* We fund the Npcap project by selling two types of commercial licenses to a
* special Npcap OEM edition:
*
* 1) The Npcap OEM Redistribution License allows companies distribute Npcap OEM
* within their products. Licensees generally use the Npcap OEM silent
* installer, ensuring a seamless experience for end users. Licensees may choose
* between a perpetual unlimited license or a quarterly term license, along with
* options for commercial support and updates. Prices and details:
* https://npcap.com/oem/redist.html
*
* 2) The Npcap OEM Internal-Use License is for organizations that wish to use
* Npcap OEM internally, without redistribution outside their organization. This
* allows them to bypass the 5-system usage cap of the Npcap free edition. It
* includes commercial support and update options, and provides the extra Npcap
* OEM features such as the silent installer for automated deployment. Prices
* and details: https://npcap.com/oem/internal.html
*
* Both of these licenses include updates and support as well as a warranty.
* Npcap OEM also includes a silent installer for unattended installation.
* Further details about Npcap OEM are available from https://npcap.com/oem/,
* and you are also welcome to contact us at sales@nmap.com to ask any questions
* or set up a license for your organization.
*
* Free and open source software producers are also welcome to contact us for
* redistribution requests. However, we normally recommend that such authors
* instead ask your users to download and install Npcap themselves. It will be
* free for them if they need 5 or fewer copies.
*
* If the Nmap Project (directly or through one of our commercial licensing
* customers) has granted you additional rights to Npcap or Npcap OEM, those
* additional rights take precedence where they conflict with the terms of the
* license agreement.
*
* Since the Npcap source code is available for download and review, users
* sometimes contribute code patches to fix bugs or add new features. By sending
* these changes to the Nmap Project (including through direct email or our
* mailing lists or submitting pull requests through our source code
* repository), it is understood unless you specify otherwise that you are
* offering the Nmap Project the unlimited, non-exclusive right to reuse,
* modify, and relicense your code contribution so that we may (but are not
* obligated to) incorporate it into Npcap. If you wish to specify special
* license conditions or restrictions on your contributions, just say so when
* you send them.
*
* This software 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. Warranty rights and commercial support are
* available for the OEM Edition described above.
*
* Other copyright notices and attribution may appear below this license header.
* We have kept those for attribution purposes, but any license terms granted by
* those notices apply only to their original work, and not to any changes made
* by the Nmap Project or to this entire file.
*
***************************************************************************/
/*
* Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
* Copyright (c) 2005 - 2010 CACE Technologies, Davis (California)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Politecnico di Torino, CACE Technologies
* nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#define UNICODE 1
#include "Packet32-Int.h"
#include <tchar.h>
#include <strsafe.h>
#include <string>
#include <ntddndis.h>
#include "../npf/npf/ioctls.h"
#include "../../version.h"
#include <ws2ipdef.h>
#include <winternl.h>
#include <ip2string.h>
#include <map>
using namespace std;
#define BUFSIZE 512
#define MAX_TRY_TIME 50
#define SLEEP_TIME 50
HANDLE g_hNpcapHelperPipe = INVALID_HANDLE_VALUE; // Handle for NpcapHelper named pipe.
HANDLE g_hDllHandle = NULL; // The handle to this DLL.
CHAR g_strLoopbackAdapterName[ADAPTER_NAME_LENGTH] = "\0"; // The name of legacy "Npcap Loopback Adapter" from registry.
BOOLEAN g_bLoopbackSupport = TRUE;
map<string, int> g_nbAdapterMonitorModes; // The states for all the wireless adapters that show whether it is in the monitor mode.
#define SERVICES_REG_KEY "SYSTEM\\CurrentControlSet\\Services\\"
#define NPCAP_SERVICE_REGISTRY_KEY SERVICES_REG_KEY NPF_DRIVER_NAME
#ifdef HAVE_AIRPCAP_API
#pragma message ("Compiling Packet.dll with support for AirPcap")
#endif
#if defined(HAVE_AIRPCAP_API)
#define LOAD_OPTIONAL_LIBRARIES
VOID PacketLoadLibrariesDynamically();
#endif
#ifndef UNUSED
#define UNUSED(_x) (_x)
#endif
#include <iphlpapi.h>
#include <WpcapNames.h>
//
// Current packet.dll version. It can be retrieved directly or through the PacketGetVersion() function.
//
__declspec(dllexport) const char PacketLibraryVersion[] = WINPCAP_VER_STRING;
//
// Current driver version. It can be retrieved directly or through the PacketGetDriverVersion() function.
//
static char PacketDriverVersion[64];
//
// Current driver name ("NPF" or "NPCAP"). It can be retrieved directly or through the PacketGetDriverName() function.
//
static const char PacketDriverName[] = NPF_DRIVER_NAME;
//
// Global adapters list related variables
//
extern ADINFO_LIST g_AdaptersInfoList;
extern HANDLE g_AdaptersInfoMutex;
#ifdef LOAD_OPTIONAL_LIBRARIES
//
// Dynamic dependencies variables and declarations
//
volatile LONG g_DynamicLibrariesLoaded = 0;
HANDLE g_DynamicLibrariesMutex;
#endif
#ifdef HAVE_AIRPCAP_API
// We dynamically load the Airpcap library in order link it only when it's present on the system
AirpcapGetLastErrorHandler g_PAirpcapGetLastError;
AirpcapGetDeviceListHandler g_PAirpcapGetDeviceList;
AirpcapFreeDeviceListHandler g_PAirpcapFreeDeviceList;
AirpcapOpenHandler g_PAirpcapOpen;
AirpcapCloseHandler g_PAirpcapClose;
AirpcapGetLinkTypeHandler g_PAirpcapGetLinkType;
AirpcapSetKernelBufferHandler g_PAirpcapSetKernelBuffer;
AirpcapSetFilterHandler g_PAirpcapSetFilter;
AirpcapSetMinToCopyHandler g_PAirpcapSetMinToCopy;
AirpcapGetReadEventHandler g_PAirpcapGetReadEvent;
AirpcapReadHandler g_PAirpcapRead;
AirpcapGetStatsHandler g_PAirpcapGetStats;
AirpcapWriteHandler g_PAirpcapWrite;
#endif // HAVE_AIRPCAP_API
//
// Additions for WinPcap OEM
//
#ifdef WPCAP_OEM_UNLOAD_H
typedef BOOL (*WoemLeaveDllHandler)(void);
WoemLeaveDllHandler g_WoemLeaveDllH = NULL;
__declspec (dllexport) VOID PacketRegWoemLeaveHandler(PVOID Handler)
{
g_WoemLeaveDllH = Handler;
}
#endif // WPCAP_OEM_UNLOAD_H
//---------------------------------------------------------------------------
_Success_(return != 0)
static BOOL PacketGetFileVersion(_In_ LPCTSTR FileName, _Out_writes_(VersionBuffLen) PCHAR VersionBuff, _In_ UINT VersionBuffLen);
static BOOL NpcapCreatePipe(const char *pipeName, HANDLE moduleName)
{
const int pid = GetCurrentProcessId();
char params[BUFSIZE];
SHELLEXECUTEINFOA shExInfo = {};
DWORD nResult;
char lpFilename[BUFSIZE];
char szDrive[BUFSIZE];
char szDir[BUFSIZE];
TRACE_ENTER();
// Get Path to This Module
nResult = GetModuleFileNameA((HMODULE) moduleName, lpFilename, BUFSIZE);
if (nResult == 0)
{
nResult = GetLastError();
TRACE_PRINT1("GetModuleFileNameA failed. GLE=%d\n", nResult);
TRACE_EXIT();
SetLastError(nResult);
return FALSE;
}
_splitpath_s(lpFilename, szDrive, BUFSIZE, szDir, BUFSIZE, NULL, 0, NULL, 0);
_makepath_s(lpFilename, BUFSIZE, szDrive, szDir, "NpcapHelper", ".exe");
nResult = GetFileAttributesA(lpFilename);
if (nResult == INVALID_FILE_ATTRIBUTES)
{
nResult = GetLastError();
TRACE_PRINT2("GetFileAttributesA(%s) failed: %d", lpFilename, nResult);
TRACE_EXIT();
SetLastError(nResult);
return FALSE;
}
if (nResult & FILE_ATTRIBUTE_DIRECTORY)
{
TRACE_PRINT1("%s is a directory.", lpFilename);
TRACE_EXIT();
SetLastError(ERROR_DIRECTORY_NOT_SUPPORTED);
return FALSE;
}
sprintf_s(params, BUFSIZE, "%s %d", pipeName, pid);
shExInfo.cbSize = sizeof(shExInfo);
shExInfo.fMask = SEE_MASK_NOCLOSEPROCESS;
shExInfo.hwnd = 0;
shExInfo.lpVerb = "runas"; // Operation to perform
shExInfo.lpFile = lpFilename; // Application to start
shExInfo.lpParameters = params; // Additional parameters
shExInfo.lpDirectory = 0;
shExInfo.nShow = SW_SHOW;
shExInfo.hInstApp = 0;
if (!ShellExecuteExA(&shExInfo))
{
const DWORD dwError = GetLastError();
if (dwError == ERROR_CANCELLED)
{
// The user refused to allow privileges elevation.
// Do nothing ...
}
TRACE_EXIT();
SetLastError(dwError);
return FALSE;
}
else
{
TRACE_EXIT();
if (shExInfo.hProcess)
CloseHandle(shExInfo.hProcess);
return TRUE;
}
}
static HANDLE NpcapConnect(const char *pipeName)
{
HANDLE hPipe = INVALID_HANDLE_VALUE;
int tryTime = 0;
char lpszPipename[BUFSIZE];
DWORD err = ERROR_SUCCESS;
TRACE_ENTER();
sprintf_s(lpszPipename, BUFSIZE, "\\\\.\\pipe\\%s", pipeName);
// Try to open a named pipe; wait for it, if necessary.
while (tryTime < MAX_TRY_TIME)
{
hPipe = CreateFileA(
lpszPipename, // pipe name
GENERIC_READ | // read and write access
GENERIC_WRITE,
0, // no sharing
NULL, // default security attributes
OPEN_EXISTING, // opens existing pipe
0, // default attributes
NULL); // no template file
// Break if the pipe handle is valid.
if (hPipe != INVALID_HANDLE_VALUE)
{
err = ERROR_SUCCESS;
break;
}
else
{
err = GetLastError();
tryTime++;
Sleep(SLEEP_TIME);
}
}
TRACE_EXIT();
SetLastError(err);
return hPipe;
}
static HANDLE NpcapRequestHandle(const char *sMsg, DWORD *pdwError)
{
HANDLE hd = INVALID_HANDLE_VALUE;
LPCSTR lpvMessage = sMsg;
char chBuf[BUFSIZE] = { 0 };
BOOL fSuccess = FALSE;
DWORD cbRead, cbToWrite, cbWritten, dwMode;
HANDLE hPipe = g_hNpcapHelperPipe;
TRACE_ENTER();
if (hPipe == INVALID_HANDLE_VALUE)
{
*pdwError = ERROR_PIPE_NOT_CONNECTED;
goto Exit;
}
// The pipe connected; change to message-read mode.
dwMode = PIPE_READMODE_MESSAGE;
fSuccess = SetNamedPipeHandleState(
hPipe, // pipe handle
&dwMode, // new pipe mode
NULL, // don't set maximum bytes
NULL); // don't set maximum time
if (!fSuccess)
{
*pdwError = GetLastError();
TRACE_PRINT1("SetNamedPipeHandleState failed. GLE=%d\n", *pdwError);
goto Exit;
}
// Send a message to the pipe server.
cbToWrite = (DWORD) (strlen(lpvMessage) + 1)*sizeof(char);
TRACE_PRINT2("\nSending %d byte message: \"%hs\"\n", cbToWrite, lpvMessage);
fSuccess = WriteFile(
hPipe, // pipe handle
lpvMessage, // message
cbToWrite, // message length
&cbWritten, // bytes written
NULL); // not overlapped
if (!fSuccess)
{
*pdwError = GetLastError();
TRACE_PRINT1("WriteFile to pipe failed. GLE=%d\n", *pdwError);
goto Exit;
}
// Read from the pipe.
fSuccess = ReadFile(
hPipe, // pipe handle
chBuf, // buffer to receive reply
BUFSIZE*sizeof(char), // size of buffer
&cbRead, // number of bytes read
NULL); // not overlapped
if (!fSuccess)
{
*pdwError = GetLastError();
TRACE_PRINT1("ReadFile from pipe failed. GLE=%d\n", *pdwError);
goto Exit;
}
if (cbRead == 0)
{
*pdwError = ERROR_NO_DATA;
goto Exit;
}
int nFields = _snscanf_s(chBuf, cbRead, "%p,%lu", &hd, pdwError);
if (nFields != 2)
{
*pdwError = ERROR_OPEN_FAILED;
hd = INVALID_HANDLE_VALUE;
goto Exit;
}
TRACE_PRINT1("Received Driver Handle: %0p\n", hd);
Exit:
TRACE_EXIT();
return hd;
}
static void NpcapGetLoopbackInterfaceName()
{
TRACE_ENTER();
HKEY hKey;
DWORD type;
char buffer[BUFSIZE];
DWORD size = sizeof(buffer);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, NPCAP_SERVICE_REGISTRY_KEY "\\Parameters", 0, KEY_READ, &hKey) == ERROR_SUCCESS)
{
if (RegQueryValueExA(hKey, "LoopbackSupport", 0, &type, (LPBYTE)buffer, &size) == ERROR_SUCCESS && type == REG_DWORD)
{
g_bLoopbackSupport = (0 != *((DWORD *) buffer));
}
size = sizeof(buffer);
// if we support loopback
if (g_bLoopbackSupport
// and there's a loopback adapter device name recorded
&& RegQueryValueExA(hKey, "LoopbackAdapter", 0, &type, (LPBYTE)buffer, &size) == ERROR_SUCCESS
// and the type matches and it's an appropriate size
&& type == REG_SZ && size < ADAPTER_NAME_LENGTH + sizeof(DEVICE_PREFIX) && size > sizeof(DEVICE_PREFIX))
{
// Try to copy the adapter ID (skip the "\\Device\\" prefix)
if (FAILED(StringCchCopyA(g_strLoopbackAdapterName, sizeof(g_strLoopbackAdapterName), buffer + sizeof(DEVICE_PREFIX) - 1))) {
// Failed? Null it out and ignore.
g_strLoopbackAdapterName[0] = '\0';
}
}
RegCloseKey(hKey);
}
TRACE_EXIT();
}
static BOOL NpcapIsAdminOnlyMode()
{
TRACE_ENTER();
static BOOLEAN cached = FALSE;
static DWORD dwAdminOnlyMode = 0;
DWORD size = sizeof(DWORD);
LSTATUS status = ERROR_SUCCESS;
if (!cached) {
status = RegGetValue(HKEY_LOCAL_MACHINE, _T(NPCAP_SERVICE_REGISTRY_KEY "\\Parameters"), _T("AdminOnly"), RRF_RT_REG_DWORD, NULL, &dwAdminOnlyMode, &size);
if (status != ERROR_SUCCESS) {
TRACE_PRINT1("RegGetValue(Services\\Npcap\\Parameters\\AdminOnly) failed: %#x\n", status);
}
cached = TRUE;
}
TRACE_EXIT();
return (dwAdminOnlyMode != 0);
}
static BOOL NpcapIsRunByAdmin()
{
static BOOLEAN cached = FALSE;
BOOL bIsRunAsAdmin = FALSE;
DWORD dwError = ERROR_SUCCESS;
PSID pAdministratorsGroup = NULL;
// Allocate and initialize a SID of the administrators group.
SID_IDENTIFIER_AUTHORITY NtAuthority = SECURITY_NT_AUTHORITY;
TRACE_ENTER();
if (cached) {
return bIsRunAsAdmin;
}
if (!AllocateAndInitializeSid(
&NtAuthority,
2,
SECURITY_BUILTIN_DOMAIN_RID,
DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0,
&pAdministratorsGroup))
{
dwError = GetLastError();
goto Cleanup;
}
// Determine whether the SID of administrators group is enabled in
// the primary access token of the process.
if (!CheckTokenMembership(NULL, pAdministratorsGroup, &bIsRunAsAdmin))
{
dwError = GetLastError();
goto Cleanup;
}
cached = TRUE;
Cleanup:
// Centralized cleanup for all allocated resources.
if (pAdministratorsGroup)
{
FreeSid(pAdministratorsGroup);
pAdministratorsGroup = NULL;
}
// Throw the error if something failed in the function.
if (ERROR_SUCCESS != dwError)
{
TRACE_PRINT1("IsProcessRunningAsAdminMode failed. GLE=%d\n", dwError);
}
TRACE_PRINT1("IsProcessRunningAsAdminMode result: %hs\n", bIsRunAsAdmin ? "yes" : "no");
TRACE_EXIT();
SetLastError(dwError);
return bIsRunAsAdmin;
}
static void NpcapStartHelper()
{
TRACE_ENTER();
// Only run this function once.
// This may be a mistake; what if the helper gets killed?
static BOOL NpcapHelperTried = FALSE;
if (NpcapHelperTried)
{
TRACE_PRINT("NpcapHelper already tried\n");
TRACE_EXIT();
return;
}
// Don't try again.
NpcapHelperTried = TRUE;
// If it's already started, use that instead
if (g_hNpcapHelperPipe != INVALID_HANDLE_VALUE)
{
TRACE_PRINT("NpcapHelper already started\n");
TRACE_EXIT();
return;
}
// Check if this process is running in Administrator mode.
if (NpcapIsRunByAdmin())
{
TRACE_PRINT("Already running as admin.\n");
TRACE_EXIT();
return;
}
char pipeName[BUFSIZE];
const int pid = GetCurrentProcessId();
sprintf_s(pipeName, BUFSIZE, "npcap-%d", pid);
if (NpcapCreatePipe(pipeName, g_hDllHandle))
{
g_hNpcapHelperPipe = NpcapConnect(pipeName);
if (g_hNpcapHelperPipe == INVALID_HANDLE_VALUE)
{
TRACE_PRINT("Failed to connect to NpcapHelper.\n");
}
}
else
{
TRACE_PRINT("NpcapCreatePipe failed.\n");
}
TRACE_EXIT();
}
static void NpcapStopHelper()
{
TRACE_ENTER();
if (g_hNpcapHelperPipe != INVALID_HANDLE_VALUE)
{
CloseHandle(g_hNpcapHelperPipe);
g_hNpcapHelperPipe = INVALID_HANDLE_VALUE;
}
TRACE_EXIT();
}
/* Copies the adapter ID (GUID, or whatever comes after "NPF_" in the name) to a new string.
* Canonicalizes capitalization for the monitor-mode map (not needed otherwise).
* Returned string is a dup and must be freed.
* NpfOpenFlags will be set to an appropriate value based on any tags found (e.g. "WIFI_")
*/
_Success_(return != NULL)
_Must_inspect_result_
static PCHAR NpcapGetAdapterID(_In_ LPCSTR AdapterName, _Out_opt_ PULONG pNpfOpenFlags)
{
PCHAR outstr = NULL;
const char *src = NULL;
ULONG NpfOpenFlags = 0;
if (0 == _strnicmp(AdapterName, WINPCAP_COMPAT_DEVICE_PREFIX, sizeof(WINPCAP_COMPAT_DEVICE_PREFIX) - 1)) {
src = AdapterName + sizeof(WINPCAP_COMPAT_DEVICE_PREFIX) - 1;
}
else if (0 == _strnicmp(AdapterName, NPF_DRIVER_COMPLETE_DEVICE_PREFIX, sizeof(NPF_DRIVER_COMPLETE_DEVICE_PREFIX) - 1)) {
src = AdapterName + sizeof(NPF_DRIVER_COMPLETE_DEVICE_PREFIX) - 1;
}
else {
// Not expected format
SetLastError(ERROR_INVALID_NAME);
return NULL;
}
// Look for tags (case sensitive)
// First the most common case: no tag or it's loopback
if (src[0] == '{' || 0 == _stricmp(src, NPCAP_LOOPBACK_ADAPTER_BUILTIN)) {
;// Do nothing
}
// WIFI_ tag check
else if (0 == strncmp(src, NPF_DEVICE_NAMES_TAG_WIFI, sizeof(NPF_DEVICE_NAMES_TAG_WIFI) - 1)) {
src += sizeof(NPF_DEVICE_NAMES_TAG_WIFI) - 1;
NpfOpenFlags |= NPF_OPEN_FLAG_WIFI;
}
size_t NameLen = strnlen(AdapterName, ADAPTER_NAME_LENGTH);
if (NameLen >= ADAPTER_NAME_LENGTH) {
TRACE_PRINT("Unterminated or too-long adapter name");
SetLastError(ERROR_INVALID_NAME);
return NULL;
}
outstr = (PCHAR)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, NameLen + 1);
if (!outstr) {
TRACE_PRINT("HeapAlloc failed");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
for (UINT i=0; i <= NameLen && src[i] != '\0'; i++) {
outstr[i] = (char) toupper(src[i]);
}
if (pNpfOpenFlags != NULL) {
*pNpfOpenFlags = NpfOpenFlags;
}
return outstr;
}
/*!
\brief The main dll function.
*/
BOOL APIENTRY DllMain(HANDLE DllHandle, DWORD Reason, LPVOID lpReserved)
{
TRACE_ENTER();
PADAPTER_INFO NewAdInfo;
g_hDllHandle = DllHandle;
UNUSED(lpReserved);
switch(Reason)
{
case DLL_PROCESS_ATTACH:
TRACE_PRINT("************Packet32: DllMain************");
// Create the mutex that will protect the adapter information list
g_AdaptersInfoMutex = CreateMutex(NULL, FALSE, NULL);
#ifdef LOAD_OPTIONAL_LIBRARIES
// Create the mutex that will protect the PacketLoadLibrariesDynamically() function
g_DynamicLibrariesMutex = CreateMutex(NULL, FALSE, NULL);
#endif
//
// Retrieve NPF.sys version information from the file
//
// XXX We want to replace this with a constant. We leave it out for the moment
// TODO fixme. Those hardcoded strings are terrible...
PacketGetFileVersion(TEXT("drivers\\") TEXT(NPF_DRIVER_NAME) TEXT(".sys"), PacketDriverVersion, sizeof(PacketDriverVersion));
// Get the name for "Npcap Loopback Adapter"
NpcapGetLoopbackInterfaceName();
break;
case DLL_PROCESS_DETACH:
CloseHandle(g_AdaptersInfoMutex);
while(g_AdaptersInfoList.Adapters != NULL)
{
NewAdInfo = g_AdaptersInfoList.Adapters->Next;
HeapFree(GetProcessHeap(), 0, g_AdaptersInfoList.Adapters);
g_AdaptersInfoList.Adapters = NewAdInfo;
}
// NpcapHelper De-Initialization.
NpcapStopHelper();
#ifdef WPCAP_OEM_UNLOAD_H
if(g_WoemLeaveDllH)
{
g_WoemLeaveDllH();
}
#endif // WPCAP_OEM_UNLOAD_H
break;
default:
break;
}
TRACE_EXIT();
return TRUE;
}
#ifdef LOAD_OPTIONAL_LIBRARIES
//
// This wrapper around loadlibrary appends the system folder (usually c:\windows\system32)
// to the relative path of the DLL, so that the DLL is always loaded from an absolute path
// (It's no longer possible to load airpcap.dll from the application folder).
// This solves the DLL Hijacking issue discovered in August 2010
// http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html
//
static HMODULE LoadLibrarySafe(LPCTSTR lpFileName)
{
TRACE_ENTER();
TCHAR path[MAX_PATH+1] = { 0 };
TCHAR fullFileName[MAX_PATH+1];
UINT res;
HMODULE hModule = NULL;
DWORD err = ERROR_SUCCESS;
do
{
res = GetSystemDirectory(path, MAX_PATH);
if (res == 0)
{
//
// some bad failure occurred;
//
err = GetLastError();
break;
}
if (res > MAX_PATH)
{
//
// the buffer was not big enough
//
err = (ERROR_INSUFFICIENT_BUFFER);
break;
}
if (_tcslen(lpFileName) + 1 + res + 1 < MAX_PATH)
{
memcpy(fullFileName, path, res * sizeof(TCHAR));
fullFileName[res] = _T('\\');
memcpy(&fullFileName[res + 1], lpFileName, (_tcslen(lpFileName) + 1) * sizeof(TCHAR));
hModule = LoadLibrary(fullFileName);
err = GetLastError();
}
else
{
err = (ERROR_INSUFFICIENT_BUFFER);
}
}while(FALSE);
TRACE_EXIT();
SetLastError(err);
return hModule;
}
/*!
\brief This function is used to dynamically load some of the libraries winpcap depends on,
and that are not guaranteed to be in the system
\param cp A string containing the address.
\return the converted 32-bit numeric address.
Doesn't check to make sure the address is valid.
*/
VOID PacketLoadLibrariesDynamically()
{
#ifdef HAVE_AIRPCAP_API
HMODULE AirpcapLib;
#endif // HAVE_AIRPCAP_API
TRACE_ENTER();
//
// Acquire the global mutex, so we wait until other threads are done
//
WaitForSingleObject(g_DynamicLibrariesMutex, INFINITE);
//
// Only the first thread should do the initialization
//
g_DynamicLibrariesLoaded++;
if(g_DynamicLibrariesLoaded != 1)
{
ReleaseMutex(g_DynamicLibrariesMutex);
TRACE_EXIT();
return;
}
#ifdef HAVE_AIRPCAP_API
/* We dinamically load the airpcap library in order link it only when it's present on the system */
if((AirpcapLib = LoadLibrarySafe(TEXT("airpcap.dll"))) == NULL)
{
// Report the error but go on
TRACE_PRINT("AirPcap library not found on this system");
}
else
{
//
// Find the exports
//
g_PAirpcapGetLastError = (AirpcapGetLastErrorHandler) GetProcAddress(AirpcapLib, "AirpcapGetLastError");
g_PAirpcapGetDeviceList = (AirpcapGetDeviceListHandler) GetProcAddress(AirpcapLib, "AirpcapGetDeviceList");
g_PAirpcapFreeDeviceList = (AirpcapFreeDeviceListHandler) GetProcAddress(AirpcapLib, "AirpcapFreeDeviceList");
g_PAirpcapOpen = (AirpcapOpenHandler) GetProcAddress(AirpcapLib, "AirpcapOpen");
g_PAirpcapClose = (AirpcapCloseHandler) GetProcAddress(AirpcapLib, "AirpcapClose");
g_PAirpcapGetLinkType = (AirpcapGetLinkTypeHandler) GetProcAddress(AirpcapLib, "AirpcapGetLinkType");
g_PAirpcapSetKernelBuffer = (AirpcapSetKernelBufferHandler) GetProcAddress(AirpcapLib, "AirpcapSetKernelBuffer");
g_PAirpcapSetFilter = (AirpcapSetFilterHandler) GetProcAddress(AirpcapLib, "AirpcapSetFilter");
g_PAirpcapSetMinToCopy = (AirpcapSetMinToCopyHandler) GetProcAddress(AirpcapLib, "AirpcapSetMinToCopy");
g_PAirpcapGetReadEvent = (AirpcapGetReadEventHandler) GetProcAddress(AirpcapLib, "AirpcapGetReadEvent");
g_PAirpcapRead = (AirpcapReadHandler) GetProcAddress(AirpcapLib, "AirpcapRead");
g_PAirpcapGetStats = (AirpcapGetStatsHandler) GetProcAddress(AirpcapLib, "AirpcapGetStats");
g_PAirpcapWrite = (AirpcapWriteHandler) GetProcAddress(AirpcapLib, "AirpcapWrite");
//
// Make sure that we found everything
//
if(g_PAirpcapGetLastError == NULL ||
g_PAirpcapGetDeviceList == NULL ||
g_PAirpcapFreeDeviceList == NULL ||
g_PAirpcapClose == NULL ||
g_PAirpcapGetLinkType == NULL ||
g_PAirpcapSetKernelBuffer == NULL ||
g_PAirpcapSetFilter == NULL ||
g_PAirpcapSetMinToCopy == NULL ||
g_PAirpcapGetReadEvent == NULL ||
g_PAirpcapRead == NULL ||
g_PAirpcapGetStats == NULL)
{
// No, something missing. A NULL g_PAirpcapOpen will disable airpcap adapters check
g_PAirpcapOpen = NULL;
}
}
#endif // HAVE_AIRPCAP_API
//
// Done. Release the mutex and return
//
ReleaseMutex(g_DynamicLibrariesMutex);
TRACE_EXIT();
return;
}
#endif
/*!
\brief Converts an UNICODE string to ASCII. Uses the WideCharToMultiByte() system function.
\param string The string to convert.
\return The converted string.
*/
_Success_(return != NULL)
_Must_inspect_result_
static PCHAR WChar2SChar(_In_ LPCWCH string)
{
PCHAR TmpStr;
TmpStr = (CHAR*) HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (DWORD)(wcslen(string)+2));
if (TmpStr == NULL) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return NULL;
}
if (!WideCharToMultiByte(CP_ACP, 0, string, -1, TmpStr, (DWORD)(wcslen(string)+2), NULL, NULL)) {
DWORD err = GetLastError();
HeapFree(GetProcessHeap(), 0, TmpStr);
SetLastError(err);
return NULL;
}
return TmpStr;
}
/*!
\brief Sets the maximum possible lookahead buffer for the driver's Packet_tap() function.
\param AdapterObject Handle to the service control manager.
\return If the function succeeds, the return value is nonzero.
The lookahead buffer is the portion of packet that Packet_tap() can access from the NIC driver's memory
without performing a copy. This function tries to increase the size of that buffer.
NOTE: this function is used for NPF adapters, only.
Npcap NOTE: This may no longer be necessary. Testing required.
*/
BOOLEAN PacketSetMaxLookaheadsize (LPADAPTER AdapterObject)
{
BOOLEAN Status;
CHAR IoCtlBuffer[sizeof(PACKET_OID_DATA) + sizeof(ULONG) - 1] = { 0 };
PPACKET_OID_DATA OidData = (PPACKET_OID_DATA)IoCtlBuffer;
DWORD err = ERROR_SUCCESS;
TRACE_ENTER();
assert(!(AdapterObject->Flags & INFO_FLAG_MASK_NOT_NPF));
if (AdapterObject->Flags & INFO_FLAG_NPCAP_LOOPBACK) {
// Loopback adapter doesn't support this; fake success
TRACE_EXIT();
SetLastError(ERROR_SUCCESS);
return TRUE;
}
//set the size of the lookahead buffer to the maximum available by the the NIC driver
OidData->Oid=OID_GEN_MAXIMUM_LOOKAHEAD;
OidData->Length=sizeof(ULONG);
Status=PacketRequest(AdapterObject,FALSE,OidData);
if (!Status) {
err = GetLastError();
TRACE_EXIT();
SetLastError(err);
return FALSE;
}
OidData->Oid=OID_GEN_CURRENT_LOOKAHEAD;
Status=PacketRequest(AdapterObject,TRUE,OidData);
if (!Status) {
err = GetLastError();
}
TRACE_EXIT();
SetLastError(err);
return Status;
}
/*!
\brief Allocates the read event associated with the capture instance, passes it down to the kernel driver
and stores it in an _ADAPTER structure.
\param AdapterObject Handle to the adapter.
\return If the function succeeds, the return value is nonzero.
This function is used by PacketOpenAdapter() to allocate the read event and pass it to the driver by means of an ioctl
call and set it in the _ADAPTER structure pointed by AdapterObject.
NOTE: this function is used for NPF adapters, only.
*/
BOOLEAN PacketSetReadEvt(LPADAPTER AdapterObject)
{
DWORD BytesReturned;
HANDLE hEvent;
DWORD err = ERROR_SUCCESS;
TRACE_ENTER();
assert(!(AdapterObject->Flags & INFO_FLAG_MASK_NOT_NPF));
if (AdapterObject->ReadEvent != NULL)
{
TRACE_PRINT("ReadEvent is not NULL");
SetLastError(ERROR_INVALID_FUNCTION);
return FALSE;
}
hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (hEvent == NULL)
{
err = GetLastError();
TRACE_PRINT("Error in CreateEvent");
TRACE_EXIT();
SetLastError(err);