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/* $Id: ldrFile.cpp $ */
/** @file
* IPRT - Binary Image Loader, The File Oriented Parts.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_LDR
#include <iprt/ldr.h>
#include "internal/iprt.h"
#include <iprt/alloc.h>
#include <iprt/file.h>
#include <iprt/assert.h>
#include <iprt/log.h>
#include <iprt/err.h>
#include <iprt/string.h>
#include <iprt/formats/mz.h>
#include "internal/ldr.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* File Reader instance.
* This provides raw image bits from a file.
*/
typedef struct RTLDRREADERFILE
{
/** The core. */
RTLDRREADER Core;
/** The file. */
RTFILE hFile;
/** The file size. */
RTFOFF cbFile;
/** The current offset. */
RTFOFF off;
/** Number of users or the mapping. */
RTUINT cMappings;
/** Pointer to the in memory mapping. */
void *pvMapping;
/** The filename (variable size). */
char szFilename[1];
} RTLDRREADERFILE, *PRTLDRREADERFILE;
/** @copydoc RTLDRREADER::pfnRead */
static DECLCALLBACK(int) rtldrFileRead(PRTLDRREADER pReader, void *pvBuf, size_t cb, RTFOFF off)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
/*
* Seek.
*/
if (pFileReader->off != off)
{
int rc = RTFileSeek(pFileReader->hFile, off, RTFILE_SEEK_BEGIN, NULL);
if (RT_FAILURE(rc))
{
pFileReader->off = -1;
return rc;
}
pFileReader->off = off;
}
/*
* Read.
*/
int rc = RTFileRead(pFileReader->hFile, pvBuf, cb, NULL);
if (RT_SUCCESS(rc))
pFileReader->off += cb;
else
pFileReader->off = -1;
return rc;
}
/** @copydoc RTLDRREADER::pfnTell */
static DECLCALLBACK(RTFOFF) rtldrFileTell(PRTLDRREADER pReader)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
return pFileReader->off;
}
/** @copydoc RTLDRREADER::pfnSize */
static DECLCALLBACK(RTFOFF) rtldrFileSize(PRTLDRREADER pReader)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
return pFileReader->cbFile;
}
/** @copydoc RTLDRREADER::pfnLogName */
static DECLCALLBACK(const char *) rtldrFileLogName(PRTLDRREADER pReader)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
return pFileReader->szFilename;
}
/** @copydoc RTLDRREADER::pfnMap */
static DECLCALLBACK(int) rtldrFileMap(PRTLDRREADER pReader, const void **ppvBits)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
/*
* Already mapped?
*/
if (pFileReader->pvMapping)
{
pFileReader->cMappings++;
*ppvBits = pFileReader->pvMapping;
return VINF_SUCCESS;
}
/*
* Allocate memory.
*/
size_t cb = (size_t)pFileReader->cbFile;
if ((RTFOFF)cb != pFileReader->cbFile)
return VERR_IMAGE_TOO_BIG;
pFileReader->pvMapping = RTMemAlloc(cb);
if (!pFileReader->pvMapping)
return VERR_NO_MEMORY;
int rc = rtldrFileRead(pReader, pFileReader->pvMapping, cb, 0);
if (RT_SUCCESS(rc))
{
pFileReader->cMappings = 1;
*ppvBits = pFileReader->pvMapping;
}
else
{
RTMemFree(pFileReader->pvMapping);
pFileReader->pvMapping = NULL;
}
return rc;
}
/** @copydoc RTLDRREADER::pfnUnmap */
static DECLCALLBACK(int) rtldrFileUnmap(PRTLDRREADER pReader, const void *pvBits)
{
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
AssertReturn(pFileReader->cMappings > 0, VERR_INVALID_PARAMETER);
if (!--pFileReader->cMappings)
{
RTMemFree(pFileReader->pvMapping);
pFileReader->pvMapping = NULL;
}
NOREF(pvBits);
return VINF_SUCCESS;
}
/** @copydoc RTLDRREADER::pfnDestroy */
static DECLCALLBACK(int) rtldrFileDestroy(PRTLDRREADER pReader)
{
int rc = VINF_SUCCESS;
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)pReader;
if (pFileReader->hFile != NIL_RTFILE)
{
rc = RTFileClose(pFileReader->hFile);
AssertRC(rc);
pFileReader->hFile = NIL_RTFILE;
}
RTMemFree(pFileReader);
return rc;
}
/**
* Opens a loader file reader.
*
* @returns iprt status code.
* @param ppReader Where to store the reader instance on success.
* @param pszFilename The file to open.
*/
static int rtldrFileCreate(PRTLDRREADER *ppReader, const char *pszFilename)
{
size_t cchFilename = strlen(pszFilename);
int rc = VERR_NO_MEMORY;
PRTLDRREADERFILE pFileReader = (PRTLDRREADERFILE)RTMemAlloc(sizeof(*pFileReader) + cchFilename);
if (pFileReader)
{
memcpy(pFileReader->szFilename, pszFilename, cchFilename + 1);
rc = RTFileOpen(&pFileReader->hFile, pszFilename, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE);
if (RT_SUCCESS(rc))
{
rc = RTFileGetSize(pFileReader->hFile, (uint64_t *)&pFileReader->cbFile);
if (RT_SUCCESS(rc))
{
pFileReader->Core.uMagic = RTLDRREADER_MAGIC;
pFileReader->Core.pfnRead = rtldrFileRead;
pFileReader->Core.pfnTell = rtldrFileTell;
pFileReader->Core.pfnSize = rtldrFileSize;
pFileReader->Core.pfnLogName = rtldrFileLogName;
pFileReader->Core.pfnMap = rtldrFileMap;
pFileReader->Core.pfnUnmap = rtldrFileUnmap;
pFileReader->Core.pfnDestroy = rtldrFileDestroy;
pFileReader->off = 0;
pFileReader->cMappings = 0;
pFileReader->pvMapping = NULL;
*ppReader = &pFileReader->Core;
return VINF_SUCCESS;
}
RTFileClose(pFileReader->hFile);
}
RTMemFree(pFileReader);
}
*ppReader = NULL;
return rc;
}
/**
* Open a binary image file.
*
* @returns iprt status code.
* @param pszFilename Image filename.
* @param fFlags Valid RTLDR_O_XXX combination.
* @param enmArch CPU architecture specifier for the image to be loaded.
* @param phLdrMod Where to store the handle to the loader module.
*/
RTDECL(int) RTLdrOpen(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
{
return RTLdrOpenEx(pszFilename, fFlags, enmArch, phLdrMod, NULL /*pErrInfo*/);
}
RT_EXPORT_SYMBOL(RTLdrOpen);
/**
* Open a binary image file, extended version.
*
* @returns iprt status code.
* @param pszFilename Image filename.
* @param fFlags Valid RTLDR_O_XXX combination.
* @param enmArch CPU architecture specifier for the image to be loaded.
* @param phLdrMod Where to store the handle to the loader module.
* @param pErrInfo Where to return extended error information. Optional.
*/
RTDECL(int) RTLdrOpenEx(const char *pszFilename, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod, PRTERRINFO pErrInfo)
{
LogFlow(("RTLdrOpenEx: pszFilename=%p:{%s} fFlags=%#x enmArch=%d phLdrMod=%p\n",
pszFilename, pszFilename, fFlags, enmArch, phLdrMod));
AssertMsgReturn(!(fFlags & ~RTLDR_O_VALID_MASK), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
AssertMsgReturn(enmArch > RTLDRARCH_INVALID && enmArch < RTLDRARCH_END, ("%d\n", enmArch), VERR_INVALID_PARAMETER);
/*
* Create file reader & invoke worker which identifies and calls the image interpreter.
*/
PRTLDRREADER pReader;
int rc = rtldrFileCreate(&pReader, pszFilename);
if (RT_SUCCESS(rc))
{
rc = RTLdrOpenWithReader(pReader, fFlags, enmArch, phLdrMod, pErrInfo);
if (RT_SUCCESS(rc))
{
LogFlow(("RTLdrOpenEx: return %Rrc *phLdrMod=%p\n", rc, *phLdrMod));
return rc;
}
pReader->pfnDestroy(pReader);
}
*phLdrMod = NIL_RTLDRMOD;
LogFlow(("RTLdrOpenEx: return %Rrc\n", rc));
return rc;
}
RT_EXPORT_SYMBOL(RTLdrOpenEx);
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