tftpd.exe开启调试

 debugFlags设置为0xf开启debug

设置为0xf000f则开启debug和trace
第一部分：
位置
net/tcpip/services/tftpd/service.c

    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                     "System\\CurrentControlSet\\Services\\Tftpd\\Parameters",
                     0, KEY_QUERY_VALUE, &parameters) != ERROR_SUCCESS)
上面是注册表路径

void
TftpdReadRegistryParameters() {

    DWORD keyType, valueSize;
    char path[MAX_PATH];
    HKEY parameters = NULL;

    // Open the registry key which contains all the adjustable parameters
    // to the service.  We will register for notification on it later incase
    // anything changes while we're running.
    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                     "System\\CurrentControlSet\\Services\\Tftpd\\Parameters",
                     0, KEY_QUERY_VALUE, &parameters) != ERROR_SUCCESS)
        parameters = NULL;
    if (parameters == NULL) {
        globals.parameters.hashEntries   =   256;
        globals.parameters.lowWaterMark  =     5;
        globals.parameters.highWaterMark =   256;
        globals.parameters.maxRetries    =    10;
        TftpdSetStartDirectory(NULL);
        strcpy(globals.parameters.validClients,    "*.*.*.*");
        strcpy(globals.parameters.validReadFiles,  "*");
        strcpy(globals.parameters.validMasters,    "*.*.*.*");
        strcpy(globals.parameters.validWriteFiles, "*");
        return;
    }

#if (DBG)
    // Initialize debug settings (if applicable) :
    keyType = 0;
    valueSize = sizeof(globals.parameters.debugFlags);
    if ((RegQueryValueEx(parameters, "DebugFlags", NULL, &keyType,
                         (LPBYTE)&globals.parameters.debugFlags, &valueSize) != ERROR_SUCCESS) ||
        (keyType != REG_DWORD)) {
        globals.parameters.debugFlags = 0x00000000;
    }
#endif // (DBG)

第二部分：
位置
net/tcpip/services/tftpd/debug.c

#if (DBG)

#include <stdio.h>

void __cdecl
TftpdOutputDebug(ULONG flag, CHAR *format, ...) {
    
    CHAR buffer[1024];
    va_list args;

    if (!(flag & globals.parameters.debugFlags))
        return;

    va_start(args, format);
    sprintf(buffer, "[%04X] ", GetCurrentThreadId());
    vsprintf(buffer + 7, format, args);
    va_end(args);

    OutputDebugString(buffer);

} // TftpdOutputDebug()

#endif // (DBG)

第三部分：
位置
net/tcpip/services/tftpd/precomp.h
//
// Debug
//

#if defined(DBG)

void __cdecl
TftpdOutputDebug(ULONG flag, char *format, ...);

#define  TFTPD_DEBUG(x)             TftpdOutputDebug x

#define  TFTPD_DBG_SERVICE          0x00000001
#define  TFTPD_DBG_IO               0x00000002
#define  TFTPD_DBG_PROCESS          0x00000004
#define  TFTPD_DBG_CONTEXT          0x00000008

#define  TFTPD_TRACE_SERVICE        0x00010000
#define  TFTPD_TRACE_IO             0x00020000
#define  TFTPD_TRACE_PROCESS        0x00040000
#define  TFTPD_TRACE_CONTEXT        0x00080000

#else

#define  TFTPD_DEBUG(x)

#endif // defined(DBG)