How to judge whether a serial port being monitored-CodePudding

I made a small program to a serial port to send data, how to judge me serial port to send data to have intercepted, mainly is don't want to let others see my hair, ask how to judge whether open the serial port on a computer before interception software?

CodePudding user response:

The following are examples of hook comm

 
/* 
First call: \ \. \ "COM1 CreateFileW" 
Then call: \ \. \ "COM1 CreateFileA" 
*/
HANDLE WINAPI myCreateFileA (LPCSTR lpFileName, dwords dwDesiredAccess DWORD dwShareMode, 
LPSECURITY_ATTRIBUTES lpSecurityAttributes dwords dwCreationDisposition, 
DWORD dwFlagsAndAttributes, HANDLE hTemplateFile) 
{//unhook first 
G_HookApi. UnhookOneApi (& amp; Myapi_info [CREATEFILEA]); 
HANDLE HANDLE=CreateFileA (lpFileName dwDesiredAccess, dwShareMode, lpSecurityAttributes, 
DwCreationDisposition dwFlagsAndAttributes, hTemplateFile); 
//hook again 
G_HookApi. HookOneApi (& amp; Myapi_info [CREATEFILEA]); 
//
If (handle!=INVALID_HANDLE_VALUE) 
{//handle 
If (g_CommFile!=handle)//not comes 
{//because first call: "\ \. \ COM1 CreateFileW" 
Char * CommPort=0; 
CommPort=STRRCHR (" c: "(lpFileName, '\' \ '); 
If (CommPort) CommPort++; 
The else CommPort=lpFileName (char *); 
If (strnicmp (CommPort, "COM", 3)==0) 
{//save the handle and the port name 
G_CommFile=handle; 
Strcpy (g_CommStruc.Com mName, CommPort); 
# ifdef _DEBUG 
SendData2Dialog (WM_CFA_MSG, (BYTE *) mName (g_CommStruc.Com), strlen (g_CommStruc.Com mName) + 1); 
# endif 
} 
} 
} 
Return the handle. 
} 
//
HANDLE WINAPI myCreateFileW (LPCWSTR lpFileName, dwords dwDesiredAccess DWORD dwShareMode, 
LPSECURITY_ATTRIBUTES lpSecurityAttributes dwords dwCreationDisposition, 
DWORD dwFlagsAndAttributes, HANDLE hTemplateFile) 
{//unhook first 
G_HookApi. UnhookOneApi (& amp; Myapi_info [CREATEFILEW]); 
HANDLE HANDLE=CreateFileW (lpFileName dwDesiredAccess, dwShareMode, lpSecurityAttributes, 
DwCreationDisposition dwFlagsAndAttributes, hTemplateFile); 
//hook again 
G_HookApi. HookOneApi (& amp; Myapi_info [CREATEFILEW]); 
//
If (handle!=INVALID_HANDLE_VALUE) 
{
If (g_CommFile!=handle) 
{
Char fname [MAX_PATH]={0}; COM1//'\ \ \' 
WideCharToMultiByte (lpFileName CP_ACP, 0, 1, fname, MAX_PATH/2, NULL, NULL); 

Char * CommPort=0; 
CommPort=STRRCHR (" c: "(fname, '\' \ '); 
If (CommPort) CommPort++; 
The else CommPort=fname; 
If (strnicmp (CommPort, "COM", 3)==0) 
{//save the handle and the port name 
G_CommFile=handle; 
Strcpy (g_CommStruc.Com mName, CommPort); 
# ifdef _DEBUG 
SendData2Dialog (WM_CFW_MSG, (BYTE *) mName (g_CommStruc.Com), strlen (g_CommStruc.Com mName) + 1); 
# endif 
} 
} 
} 
Return the handle. 
}

CodePudding user response:

You can receive encrypted email

CodePudding user response:

If somebody else outside and put through a serial port to receive, how do you monitor?

CodePudding user response:

reference 1st floor schlafenhamster response:

the following are examples of hook comm

 
/* 
First call: \ \. \ "COM1 CreateFileW" 
Then call: \ \. \ "COM1 CreateFileA" 
*/
HANDLE WINAPI myCreateFileA (LPCSTR lpFileName, dwords dwDesiredAccess DWORD dwShareMode, 
LPSECURITY_ATTRIBUTES lpSecurityAttributes dwords dwCreationDisposition, 
DWORD dwFlagsAndAttributes, HANDLE hTemplateFile) 
{//unhook first 
G_HookApi. UnhookOneApi (& amp; Myapi_info [CREATEFILEA]); 
HANDLE HANDLE=CreateFileA (lpFileName dwDesiredAccess, dwShareMode, lpSecurityAttributes, 
DwCreationDisposition dwFlagsAndAttributes, hTemplateFile); 
//hook again 
G_HookApi. HookOneApi (& amp; Myapi_info [CREATEFILEA]); 
//
If (handle!=INVALID_HANDLE_VALUE) 
{//handle 
If (g_CommFile!=handle)//not comes 
{//because first call: "\ \. \ COM1 CreateFileW" 
Char * CommPort=0; 
CommPort=STRRCHR (" c: "(lpFileName, '\' \ '); 
If (CommPort) CommPort++; 
The else CommPort=lpFileName (char *); 
If (strnicmp (CommPort, "COM", 3)==0) 
{//save the handle and the port name 
G_CommFile=handle; 
Strcpy (g_CommStruc.Com mName, CommPort); 
# ifdef _DEBUG 
SendData2Dialog (WM_CFA_MSG, (BYTE *) mName (g_CommStruc.Com), strlen (g_CommStruc.Com mName) + 1); 
# endif 
} 
} 
} 
Return the handle. 
} 
//
HANDLE WINAPI myCreateFileW (LPCWSTR lpFileName, dwords dwDesiredAccess DWORD dwShareMode, 
LPSECURITY_ATTRIBUTES lpSecurityAttributes dwords dwCreationDisposition, 
DWORD dwFlagsAndAttributes, HANDLE hTemplateFile) 
{//unhook first 
G_HookApi. UnhookOneApi (& amp; Myapi_info [CREATEFILEW]); 
HANDLE HANDLE=CreateFileW (lpFileName dwDesiredAccess, dwShareMode, lpSecurityAttributes, 
DwCreationDisposition dwFlagsAndAttributes, hTemplateFile); 
//hook again 
G_HookApi. HookOneApi (& amp; Myapi_info [CREATEFILEW]); 
//
If (handle!=INVALID_HANDLE_VALUE) 
{
If (g_CommFile!=handle) 
{
Char fname [MAX_PATH]={0}; COM1//'\ \ \' 
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