| 1 | /* $Id: kLdrMod.c 2827 2006-10-22 18:05:28Z bird $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * kLdr - The Dynamic Loader, The module interpreter.
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| 5 | *
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| 6 | * Copyright (c) 2006 knut st. osmundsen <bird-kbuild-src@anduin.net>
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| 7 | *
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| 8 | *
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| 9 | * This file is part of kLdr.
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| 10 | *
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| 11 | * kLdr is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * kLdr is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | * GNU General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with kLdr; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | *
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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 | #include <kLdr.h>
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| 32 | #include "kLdrHlp.h"
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| 33 | #include "kLdrInternal.h"
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| 34 | #include "kLdrModMZ.h"
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| 35 | #if 1 /* testing headers */
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| 36 | # include "kLdrModPE.h"
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| 37 | //# include "kLdrModLX.h"
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| 38 | # include "kLdrModELF32.h"
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| 39 | # include "kLdrModELF64.h"
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| 40 | #endif
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| 41 |
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| 42 |
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| 43 | /**
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| 44 | * Open a executable image from a file provider instance.
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| 45 | *
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| 46 | * @returns 0 on success and *ppMod pointing to a module instance.
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| 47 | * On failure, a non-zero OS specific error code is returned.
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| 48 | * @param pRdr The file provider instance to use.
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| 49 | * On success, the ownership of the instance is taken by the
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| 50 | * module and the caller must not ever touch it again.
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| 51 | * (The instance is not closed on failure, the call has to do that.)
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| 52 | * @param ppMod Where to store the module handle.
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| 53 | */
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| 54 | int kLdrModOpenFromRdr(PKLDRRDR pRdr, PPKLDRMOD ppMod)
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| 55 | {
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| 56 | union
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| 57 | {
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| 58 | uint32_t u32;
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| 59 | uint16_t u16;
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| 60 | uint16_t au16[2];
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| 61 | uint8_t au8[4];
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| 62 | } u;
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| 63 | off_t offHdr = 0;
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| 64 | int rc;
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| 65 |
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| 66 | /*
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| 67 | * Try figure out what kind of image this is.
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| 68 | * Always read the 'new header' if we encounter MZ.
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| 69 | */
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| 70 | rc = kLdrRdrRead(pRdr, &u, sizeof(u), 0);
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| 71 | if (rc)
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| 72 | return rc;
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| 73 | if ( u.u16 == IMAGE_DOS_SIGNATURE
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| 74 | && kLdrRdrSize(pRdr) > sizeof(IMAGE_DOS_HEADER))
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| 75 | {
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| 76 | rc = kLdrRdrRead(pRdr, &u, sizeof(u.u32), KLDR_OFFSETOF(IMAGE_DOS_HEADER, e_lfanew));
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| 77 | if (rc)
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| 78 | return rc;
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| 79 | if ((off_t)u.u32 < kLdrRdrSize(pRdr))
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| 80 | {
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| 81 | offHdr = u.u32;
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| 82 | rc = kLdrRdrRead(pRdr, &u, sizeof(u.u32), offHdr);
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| 83 | if (rc)
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| 84 | return rc;
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| 85 | }
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| 86 | else
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| 87 | u.u16 = IMAGE_DOS_SIGNATURE;
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| 88 | }
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| 89 |
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| 90 | /*
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| 91 | * Use the magic to select the appropriate image interpreter.
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| 92 | */
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| 93 | if (u.u16 == IMAGE_DOS_SIGNATURE)
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| 94 | return KLDR_ERR_MZ_NOT_SUPPORTED;
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| 95 | else if (u.u16 == IMAGE_NE_SIGNATURE)
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| 96 | return KLDR_ERR_NE_NOT_SUPPORTED;
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| 97 | else if (u.u16 == IMAGE_LX_SIGNATURE)
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| 98 | return KLDR_ERR_LX_NOT_SUPPORTED;
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| 99 | else if (u.u16 == IMAGE_LE_SIGNATURE)
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| 100 | return KLDR_ERR_LE_NOT_SUPPORTED;
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| 101 | else if (u.u32 == IMAGE_NT_SIGNATURE)
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| 102 | return KLDR_ERR_PE_NOT_SUPPORTED;
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| 103 | else if (u.u32 == IMAGE_ELF_SIGNATURE)
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| 104 | return KLDR_ERR_ELF_NOT_SUPPORTED;
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| 105 | return KLDR_ERR_UNKNOWN_FORMAT;
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| 106 | }
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| 107 |
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| 108 |
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| 109 | /**
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| 110 | * Open a executable image by file name.
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| 111 | *
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| 112 | * @returns 0 on success and *ppMod pointing to a module instance.
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| 113 | * On failure, a non-zero OS specific error code is returned.
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| 114 | * @param pszFilename The filename to open.
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| 115 | * @param ppMod Where to store the module handle.
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| 116 | */
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| 117 | int kLdrModOpen(const char *pszFilename, PPKLDRMOD ppMod)
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| 118 | {
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| 119 | /*
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| 120 | * Open the file using a bit provider.
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| 121 | */
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| 122 | PKLDRRDR pRdr;
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| 123 | int rc = kLdrRdrOpen(&pRdr, pszFilename);
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| 124 | if (!rc)
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| 125 | {
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| 126 | rc = kLdrModOpenFromRdr(pRdr, ppMod);
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| 127 | if (!rc)
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| 128 | return 0;
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| 129 | kLdrRdrClose(pRdr);
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| 130 | }
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| 131 | return rc;
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| 132 | }
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| 133 |
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