| 1 | /* $Id: ldr.cpp 44528 2013-02-04 14:27:54Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Binary Image Loader.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2011 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*******************************************************************************
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| 29 | * Header Files *
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| 30 | *******************************************************************************/
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| 31 | #define LOG_GROUP RTLOGGROUP_LDR
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| 32 | #include <iprt/ldr.h>
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| 33 | #include "internal/iprt.h"
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| 34 |
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| 35 | #include <iprt/alloc.h>
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| 36 | #include <iprt/string.h>
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| 37 | #include <iprt/assert.h>
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| 38 | #include <iprt/err.h>
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| 39 | #include <iprt/log.h>
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| 40 | #include "internal/ldr.h"
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * Checks if a library is loadable or not.
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| 45 | *
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| 46 | * This may attempt load and unload the library.
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| 47 | *
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| 48 | * @returns true/false accordingly.
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| 49 | * @param pszFilename Image filename.
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| 50 | */
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| 51 | RTDECL(bool) RTLdrIsLoadable(const char *pszFilename)
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| 52 | {
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| 53 | /*
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| 54 | * Try to load the library.
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| 55 | */
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| 56 | RTLDRMOD hLib;
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| 57 | int rc = RTLdrLoad(pszFilename, &hLib);
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| 58 | if (RT_SUCCESS(rc))
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| 59 | {
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| 60 | RTLdrClose(hLib);
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| 61 | return true;
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| 62 | }
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| 63 | return false;
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| 64 | }
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| 65 | RT_EXPORT_SYMBOL(RTLdrIsLoadable);
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| 66 |
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| 67 |
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| 68 | /**
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| 69 | * Gets the address of a named exported symbol.
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| 70 | *
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| 71 | * @returns iprt status code.
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| 72 | * @param hLdrMod The loader module handle.
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| 73 | * @param pszSymbol Symbol name.
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| 74 | * @param ppvValue Where to store the symbol value. Note that this is restricted to the
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| 75 | * pointer size used on the host!
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| 76 | */
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| 77 | RTDECL(int) RTLdrGetSymbol(RTLDRMOD hLdrMod, const char *pszSymbol, void **ppvValue)
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| 78 | {
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| 79 | LogFlow(("RTLdrGetSymbol: hLdrMod=%RTldrm pszSymbol=%p:{%s} ppvValue=%p\n",
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| 80 | hLdrMod, pszSymbol, pszSymbol, ppvValue));
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| 81 | /*
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| 82 | * Validate input.
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| 83 | */
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| 84 | AssertMsgReturn(rtldrIsValid(hLdrMod), ("hLdrMod=%p\n", hLdrMod), VERR_INVALID_HANDLE);
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| 85 | AssertMsgReturn(pszSymbol, ("pszSymbol=%p\n", pszSymbol), VERR_INVALID_PARAMETER);
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| 86 | AssertMsgReturn(VALID_PTR(ppvValue), ("ppvValue=%p\n", ppvValue), VERR_INVALID_PARAMETER);
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| 87 | PRTLDRMODINTERNAL pMod = (PRTLDRMODINTERNAL)hLdrMod;
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| 88 | //AssertMsgReturn(pMod->eState == LDR_STATE_OPENED, ("eState=%d\n", pMod->eState), VERR_WRONG_ORDER);
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| 89 |
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| 90 | /*
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| 91 | * Do it.
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| 92 | */
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| 93 | int rc;
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| 94 | if (pMod->pOps->pfnGetSymbol)
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| 95 | rc = pMod->pOps->pfnGetSymbol(pMod, pszSymbol, ppvValue);
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| 96 | else
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| 97 | {
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| 98 | RTUINTPTR Value = 0;
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| 99 | rc = pMod->pOps->pfnGetSymbolEx(pMod, NULL, 0, pszSymbol, &Value);
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| 100 | if (RT_SUCCESS(rc))
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| 101 | {
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| 102 | *ppvValue = (void *)(uintptr_t)Value;
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| 103 | if ((uintptr_t)*ppvValue != Value)
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| 104 | rc = VERR_BUFFER_OVERFLOW;
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| 105 | }
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| 106 | }
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| 107 | LogFlow(("RTLdrGetSymbol: return %Rrc *ppvValue=%p\n", rc, *ppvValue));
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| 108 | return rc;
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| 109 | }
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| 110 | RT_EXPORT_SYMBOL(RTLdrGetSymbol);
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| 111 |
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| 112 |
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| 113 | /**
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| 114 | * Closes a loader module handle.
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| 115 | *
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| 116 | * The handle can be obtained using any of the RTLdrLoad(), RTLdrOpen()
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| 117 | * and RTLdrOpenBits() functions.
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| 118 | *
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| 119 | * @returns iprt status code.
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| 120 | * @param hLdrMod The loader module handle.
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| 121 | */
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| 122 | RTDECL(int) RTLdrClose(RTLDRMOD hLdrMod)
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| 123 | {
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| 124 | LogFlow(("RTLdrClose: hLdrMod=%RTldrm\n", hLdrMod));
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| 125 |
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| 126 | /*
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| 127 | * Validate input.
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| 128 | */
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| 129 | AssertMsgReturn(rtldrIsValid(hLdrMod), ("hLdrMod=%p\n", hLdrMod), VERR_INVALID_HANDLE);
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| 130 | PRTLDRMODINTERNAL pMod = (PRTLDRMODINTERNAL)hLdrMod;
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| 131 | //AssertMsgReturn(pMod->eState == LDR_STATE_OPENED, ("eState=%d\n", pMod->eState), VERR_WRONG_ORDER);
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| 132 |
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| 133 | /*
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| 134 | * Do it.
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| 135 | */
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| 136 | int rc = pMod->pOps->pfnClose(pMod);
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| 137 | AssertRC(rc);
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| 138 | pMod->eState = LDR_STATE_INVALID;
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| 139 | pMod->u32Magic++;
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| 140 | RTMemFree(pMod);
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| 141 |
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| 142 | LogFlow(("RTLdrClose: returns VINF_SUCCESS\n"));
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| 143 | return VINF_SUCCESS;
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| 144 | }
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| 145 | RT_EXPORT_SYMBOL(RTLdrClose);
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| 146 |
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