FileHdrWrapper.cpp

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#include "pe/FileHdrWrapper.h"
#include "pe/PEFile.h"
 
#include <time.h>
#include <QDateTime>
 
namespace util {
    QString getDateString(const quint64 timestamp)
    {
        const time_t rawtime = (const time_t)timestamp;
        QString format = "dddd, dd.MM.yyyy hh:mm:ss";
        QDateTime date1(QDateTime(QDateTime::fromTime_t(rawtime)));
        return date1.toUTC().toString(format) + " UTC";
    }
};
 
 
std::map<DWORD, QString> FileHdrWrapper::s_fHdrCharact;
std::map<DWORD, QString> FileHdrWrapper::s_machine;
 
void FileHdrWrapper::initCharact()
{
    if (s_fHdrCharact.size() != 0) {
        return; //already initialized
    }
    s_fHdrCharact[F_RELOCS_STRIPPED] = "Relocation info stripped from file.";
    s_fHdrCharact[F_EXECUTABLE_IMAGE] = "File is executable  (i.e. no unresolved external references).";
    s_fHdrCharact[F_LINE_NUMS_STRIPPED] = "Line numbers stripped from file.";
    s_fHdrCharact[F_LOCAL_SYMS_STRIPPED] = "Local symbols stripped from file.";
    s_fHdrCharact[F_AGGRESIVE_WS_TRIM] = "Aggressively trim working set";
    s_fHdrCharact[F_LARGE_ADDRESS_AWARE] = "App can handle >2gb addresses";
    s_fHdrCharact[F_BYTES_REVERSED_LO] = "Bytes of machine word are reversed.";
    s_fHdrCharact[F_MACHINE_32BIT] = "32 bit word machine.";
    s_fHdrCharact[F_DEBUG_STRIPPED] = "Debugging info stripped from file in .DBG file";
    s_fHdrCharact[F_REMOVABLE_RUN_FROM_SWAP] = "If Image is on removable media, copy and run from the swap file.";
    s_fHdrCharact[F_NET_RUN_FROM_SWAP] = "If Image is on Net, copy and run from the swap file.";
    s_fHdrCharact[F_SYSTEM] = "System File.";
    s_fHdrCharact[F_DLL] = "File is a DLL.";
    s_fHdrCharact[F_UP_SYSTEM_ONLY] = "File should only be run on a UP machine";
    s_fHdrCharact[F_BYTES_REVERSED_HI] = "Bytes of machine word are reversed.";
}
 
std::vector<DWORD> FileHdrWrapper::splitCharact(DWORD characteristics)
{
    if (s_fHdrCharact.size() == 0) initCharact();
 
    std::vector<DWORD> chSet;
    for (std::map<DWORD, QString>::iterator iter = s_fHdrCharact.begin(); iter != s_fHdrCharact.end(); ++iter) {
        if (characteristics & iter->first) {
            chSet.push_back(iter->first);
        }
    }
    return chSet;
}
 
QString FileHdrWrapper::translateCharacteristics(DWORD charact)
{
    if (s_fHdrCharact.size() == 0)
        initCharact();
 
    if (s_fHdrCharact.find(charact) == s_fHdrCharact.end()) return "";
    return s_fHdrCharact[charact];
}
 
void FileHdrWrapper::initMachine()
{
    s_machine[M_UNKNOWN] = "s_machine unknown";
 
    s_machine[M_I386] = "Intel 386";
    s_machine[M_R3000] = "MIPS little-endian, 0x160 big-endian";
    s_machine[M_R4000] = "MIPS little-endian";
    s_machine[M_R10000] = "MIPS little-endian";
    s_machine[M_WCEMIPSV2] = " MIPS little-endian WCE v2";
    s_machine[M_ALPHA] = "Alpha_AXP";
    s_machine[M_SH3] = "SH3 little-endian";
    s_machine[M_SH3DSP] = "SH3DSP";
    s_machine[M_SH3E] = "SH3E little-endian";
    s_machine[M_SH4] = "SH4 little-endian";
    s_machine[M_SH5] = "SH5";
    s_machine[M_ARM] = "ARM Little-Endian";
    s_machine[M_THUMB] = "Thumb";
    s_machine[M_THUMB2] = "Thumb2";
    s_machine[M_AM33] = "AM33";
    s_machine[M_POWERPC] = "IBM PowerPC Little-Endian";
    s_machine[M_POWERPCFP] = "PowerRPCFP";
    s_machine[M_IA64] = "Intel 64";
    s_machine[M_MIPS16] = "MIPS";
    s_machine[M_ALPHA64] = "ALPHA64";
    s_machine[M_MIPSFPU] = "MIPS";
    s_machine[M_MIPSFPU16] = "MIPS";
    s_machine[M_AXP64] = "M_ALPHA64";
    s_machine[M_TRICORE] = " Infineon";
    s_machine[M_CEF] = "CEF";
    s_machine[M_EBC] = "EFI Byte Code";
    s_machine[M_AMD64] = "AMD64 (K8)";
    s_machine[M_M32R] = "M32R little-endian";
    s_machine[M_CEE] = "CEE";
}
 
QString FileHdrWrapper::translateMachine(DWORD val)
{
    if (s_machine.size() == 0) 
        initMachine();
 
    if (s_machine.find(val) == s_machine.end()) return "";
    return s_machine[val];
}
 
void* FileHdrWrapper::getPtr()
{
    if (this->hdr) {
        // use cached if exists
        return (void*) hdr;
    }
    if (m_PE == NULL) return NULL;
 
    offset_t myOff = m_PE->peFileHdrOffset();
    IMAGE_FILE_HEADER* hdr = (IMAGE_FILE_HEADER*) m_Exe->getContentAt(myOff, sizeof(IMAGE_FILE_HEADER));
    if (!hdr) return NULL; //error
 
    return (void*) hdr;
}
 
void* FileHdrWrapper::getFieldPtr(size_t fieldId, size_t subField)
{
    IMAGE_FILE_HEADER * hdr = reinterpret_cast<IMAGE_FILE_HEADER*>(getPtr());
    if (!hdr) return NULL;
 
    IMAGE_FILE_HEADER &fileHeader = (*hdr);
    switch (fieldId) {
         case MACHINE: return (void*) &fileHeader.Machine;
         case SEC_NUM: return (void*) &fileHeader.NumberOfSections;
         case TIMESTAMP: return (void*) &fileHeader.TimeDateStamp;
         case SYMBOL_PTR: return (void*) &fileHeader.PointerToSymbolTable;
         case SYMBOL_NUM: return (void*) &fileHeader.NumberOfSymbols;
         case OPTHDR_SIZE: return (void*) &fileHeader.SizeOfOptionalHeader;
         case CHARACT: return (void*) &fileHeader.Characteristics;
    }
    return (void*) &fileHeader;
}
 
QString FileHdrWrapper::getFieldName(size_t fieldId)
{
    switch (fieldId) {
         case MACHINE: return("Machine");
         case SEC_NUM: return ("Sections Count");
         case TIMESTAMP: {
            PEFile* myPe = dynamic_cast<PEFile*>(this->m_Exe);
            if (myPe && myPe->isReproBuild()) {
                return "ReproChecksum";
            }
            return("Time Date Stamp");
         }
         case SYMBOL_PTR: return("Ptr to Symbol Table");
         case SYMBOL_NUM: return("Num. of Symbols");
         case OPTHDR_SIZE: return("Size of OptionalHeader");
         case CHARACT: return("Characteristics");
    }
    return "";
}
 
Executable::addr_type FileHdrWrapper::containsAddrType(size_t fieldId, size_t subField)
{
    return Executable::NOT_ADDR;
}
 
QString FileHdrWrapper::translateFieldContent(size_t fieldId)
{
    IMAGE_FILE_HEADER * hdr = reinterpret_cast<IMAGE_FILE_HEADER*>(getPtr());
    if (!hdr) return "";
 
    IMAGE_FILE_HEADER &fileHeader = (*hdr);
    switch (fieldId) {
        case MACHINE: return FileHdrWrapper::translateMachine(fileHeader.Machine);
        case TIMESTAMP: {
            PEFile* myPe = dynamic_cast<PEFile*>(this->m_Exe);
            if (myPe && myPe->isReproBuild()) {
                return ""; // This is not a real timestamp
            }
            return util::getDateString(fileHeader.TimeDateStamp);
        }
    }
    return "";
}