/* $Id: RTLdrCheckImports.cpp $ */ /** @file * IPRT - Module dependency checker. */ /* * Copyright (C) 2010-2022 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included * in the VirtualBox 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. * * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Import checker options. */ typedef struct RTCHECKIMPORTSOPTS { /** Number of paths to search. */ size_t cPaths; /** Search directories. */ char **papszPaths; /** The loader architecture. */ RTLDRARCH enmLdrArch; /** Verbosity level. */ unsigned cVerbosity; /** Whether to also list orinals in the export listing. */ bool fListOrdinals; } RTCHECKIMPORTSOPTS; /** Pointer to the checker options. */ typedef RTCHECKIMPORTSOPTS *PRTCHECKIMPORTSOPTS; /** Pointer to the const checker options. */ typedef RTCHECKIMPORTSOPTS const *PCRTCHECKIMPORTSOPTS; /** * Import module. */ typedef struct RTCHECKIMPORTMODULE { /** The module. If NIL, then we've got a export list (papszExports). */ RTLDRMOD hLdrMod; /** Number of export in the export list. (Zero if hLdrMod is valid.) */ size_t cExports; /** Export list. (NULL if hLdrMod is valid.) */ char **papszExports; /** The module name. */ char szModule[256]; } RTCHECKIMPORTMODULE; /** Pointer to an import module. */ typedef RTCHECKIMPORTMODULE *PRTCHECKIMPORTMODULE; /** * Import checker state (for each image being checked). */ typedef struct RTCHECKIMPORTSTATE { /** The image we're processing. */ const char *pszImage; /** The image we're processing. */ PCRTCHECKIMPORTSOPTS pOpts; /** Status code. */ int iRc; /** Import hint. */ uint32_t iHint; /** Number modules. */ uint32_t cImports; /** Import modules. */ RT_FLEXIBLE_ARRAY_EXTENSION RTCHECKIMPORTMODULE aImports[RT_FLEXIBLE_ARRAY]; } RTCHECKIMPORTSTATE; /** Pointer to the import checker state. */ typedef RTCHECKIMPORTSTATE *PRTCHECKIMPORTSTATE; /** * Looks up a symbol/ordinal in the given import module. * * @returns IPRT status code. * @param pModule The import module. * @param pszSymbol The symbol name (NULL if not used). * @param uSymbol The ordinal (~0 if unused). * @param pValue Where to return a fake address. */ static int QuerySymbolFromImportModule(PRTCHECKIMPORTMODULE pModule, const char *pszSymbol, unsigned uSymbol, PRTLDRADDR pValue) { if (pModule->hLdrMod != NIL_RTLDRMOD) return RTLdrGetSymbolEx(pModule->hLdrMod, NULL, _128M, uSymbol, pszSymbol, pValue); /* * Search the export list. Ordinal imports are stringified: # */ char szOrdinal[32]; if (!pszSymbol) { RTStrPrintf(szOrdinal, sizeof(szOrdinal), "#%u", uSymbol); pszSymbol = szOrdinal; } size_t i = pModule->cExports; while (i-- > 0) if (strcmp(pModule->papszExports[i], pszSymbol) == 0) { *pValue = _128M + i*4; return VINF_SUCCESS; } return VERR_SYMBOL_NOT_FOUND; } /** * @callback_method_impl{FNRTLDRIMPORT} */ static DECLCALLBACK(int) GetImportCallback(RTLDRMOD hLdrMod, const char *pszModule, const char *pszSymbol, unsigned uSymbol, PRTLDRADDR pValue, void *pvUser) { PRTCHECKIMPORTSTATE pState = (PRTCHECKIMPORTSTATE)pvUser; int rc; NOREF(hLdrMod); /* * If a module is given, lookup the symbol/ordinal there. */ if (pszModule) { uint32_t iModule = pState->iHint; if ( iModule > pState->cImports || strcmp(pState->aImports[iModule].szModule, pszModule) != 0) { for (iModule = 0; iModule < pState->cImports; iModule++) if (strcmp(pState->aImports[iModule].szModule, pszModule) == 0) break; if (iModule >= pState->cImports) return RTMsgErrorRc(VERR_MODULE_NOT_FOUND, "%s: Failed to locate import module '%s'", pState->pszImage, pszModule); pState->iHint = iModule; } rc = QuerySymbolFromImportModule(&pState->aImports[iModule], pszSymbol, uSymbol, pValue); if (RT_SUCCESS(rc)) { /* likely */ } else if (rc == VERR_LDR_FORWARDER) rc= VINF_SUCCESS; else { if (pszSymbol) RTMsgError("%s: Missing import '%s' from '%s'!", pState->pszImage, pszSymbol, pszModule); else RTMsgError("%s: Missing import #%u from '%s'!", pState->pszImage, uSymbol, pszModule); pState->iRc = rc; rc = VINF_SUCCESS; *pValue = _128M + _4K; } } /* * Otherwise we need to scan all modules. */ else { Assert(pszSymbol); uint32_t iModule = pState->iHint; if (iModule < pState->cImports) rc = QuerySymbolFromImportModule(&pState->aImports[iModule], pszSymbol, uSymbol, pValue); else rc = VERR_SYMBOL_NOT_FOUND; if (rc == VERR_SYMBOL_NOT_FOUND) { for (iModule = 0; iModule < pState->cImports; iModule++) { rc = QuerySymbolFromImportModule(&pState->aImports[iModule], pszSymbol, uSymbol, pValue); if (rc != VERR_SYMBOL_NOT_FOUND) break; } } if (RT_FAILURE(rc)) { RTMsgError("%s: Missing import '%s'!", pState->pszImage, pszSymbol); pState->iRc = rc; rc = VINF_SUCCESS; *pValue = _128M + _4K; } } return rc; } /** * Loads an imported module. * * @returns IPRT status code. * @param pOpts The check program options. * @param pModule The import module. * @param pErrInfo Error buffer (to avoid wasting stack). * @param pszImage The image we're processing (for error messages). */ static int LoadImportModule(PCRTCHECKIMPORTSOPTS pOpts, PRTCHECKIMPORTMODULE pModule, PRTERRINFO pErrInfo, const char *pszImage) { /* * Look for real DLLs. */ for (uint32_t iPath = 0; iPath < pOpts->cPaths; iPath++) { char szPath[RTPATH_MAX]; int rc = RTPathJoin(szPath, sizeof(szPath), pOpts->papszPaths[iPath], pModule->szModule); if (RT_SUCCESS(rc)) { uint32_t offError; RTFSOBJINFO ObjInfo; rc = RTVfsChainQueryInfo(szPath, &ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK, &offError, pErrInfo); if (RT_SUCCESS(rc)) { if (RTFS_IS_FILE(ObjInfo.Attr.fMode)) { RTLDRMOD hLdrMod; rc = RTLdrOpenVfsChain(szPath, RTLDR_O_FOR_DEBUG, pOpts->enmLdrArch, &hLdrMod, &offError, pErrInfo); if (RT_SUCCESS(rc)) { pModule->hLdrMod = hLdrMod; if (pOpts->cVerbosity > 0) RTMsgInfo("Import '%s' -> '%s'\n", pModule->szModule, szPath); } else if (RTErrInfoIsSet(pErrInfo)) RTMsgError("%s: Failed opening import image '%s': %Rrc - %s", pszImage, szPath, rc, pErrInfo->pszMsg); else RTMsgError("%s: Failed opening import image '%s': %Rrc", pszImage, szPath, rc); return rc; } } else if ( rc != VERR_PATH_NOT_FOUND && rc != VERR_FILE_NOT_FOUND) RTVfsChainMsgError("RTVfsChainQueryInfo", szPath, rc, offError, pErrInfo); /* * Check for export file. */ RTStrCat(szPath, sizeof(szPath), ".exports"); RTVFSFILE hVfsFile; rc = RTVfsChainOpenFile(szPath, RTFILE_O_READ | RTFILE_O_OPEN | RTFILE_O_DENY_WRITE, &hVfsFile, &offError, pErrInfo); if (RT_SUCCESS(rc)) { /* Read it into a memory buffer. */ uint64_t cbFile; rc = RTVfsFileQuerySize(hVfsFile, &cbFile); if (RT_SUCCESS(rc)) { if (cbFile < _4M) { char *pszFile = (char *)RTMemAlloc((size_t)cbFile + 1); if (pszFile) { rc = RTVfsFileRead(hVfsFile, pszFile, (size_t)cbFile, NULL); if (RT_SUCCESS(rc)) { pszFile[(size_t)cbFile] = '\0'; rc = RTStrValidateEncoding(pszFile); if (RT_SUCCESS(rc)) { /* * Parse it. */ size_t iLine = 1; size_t off = 0; while (off < cbFile) { size_t const offStartLine = off; /* skip leading blanks */ while (RT_C_IS_BLANK(pszFile[off])) off++; char ch = pszFile[off]; if ( ch != ';' /* comment */ && !RT_C_IS_CNTRL(ch)) { /* find length of symbol */ size_t const offSymbol = off; while ( (ch = pszFile[off]) != '\0' && !RT_C_IS_SPACE(ch)) off++; size_t const cchSymbol = off - offSymbol; /* add it. */ if ((pModule->cExports & 127) == 0) { void *pvNew = RTMemRealloc(pModule->papszExports, (pModule->cExports + 128) * sizeof(char *)); if (!pvNew) { rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: %s:%u: out of memory!", pszImage, szPath, iLine); break; } pModule->papszExports = (char **)pvNew; } pModule->papszExports[pModule->cExports] = RTStrDupN(&pszFile[offSymbol], cchSymbol); if (pModule->papszExports[pModule->cExports]) pModule->cExports++; else { rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: %s:%u: out of memory!", pszImage, szPath, iLine); break; } /* check what comes next is a comment or end of line/file */ while (RT_C_IS_BLANK(pszFile[off])) off++; ch = pszFile[off]; if ( ch != '\0' && ch != '\n' && ch != '\r' && ch != ';') rc = RTMsgErrorRc(VERR_PARSE_ERROR, "%s: %s:%u: Unexpected text at position %u!", pszImage, szPath, iLine, off - offStartLine); } /* advance to the end of the the line */ while ( (ch = pszFile[off]) != '\0' && ch != '\n') off++; off++; iLine++; } if (pOpts->cVerbosity > 0) RTMsgInfo("Import '%s' -> '%s' (%u exports)\n", pModule->szModule, szPath, pModule->cExports); } else RTMsgError("%s: %s: Invalid UTF-8 encoding in export file: %Rrc", pszImage, szPath, rc); } RTMemFree(pszFile); } else rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: %s: Out of memory reading export file (%#RX64 bytes)", pszImage, szPath, cbFile + 1); } else rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: %s: Export file is too big: %#RX64 bytes, max 4MiB", pszImage, szPath, cbFile); } else RTMsgError("%s: %s: RTVfsFileQuerySize failed on export file: %Rrc", pszImage, szPath, rc); RTVfsFileRelease(hVfsFile); return rc; } else if ( rc != VERR_PATH_NOT_FOUND && rc != VERR_FILE_NOT_FOUND) RTVfsChainMsgError("RTVfsChainOpenFile", szPath, rc, offError, pErrInfo); } } return RTMsgErrorRc(VERR_MODULE_NOT_FOUND, "%s: Import module '%s' was not found!", pszImage, pModule->szModule); } /** * Checks the imports for the given image. * * @returns IPRT status code. * @param pOpts The check program options. * @param pszImage The image to check. */ static int rtCheckImportsForImage(PCRTCHECKIMPORTSOPTS pOpts, const char *pszImage) { if (pOpts->cVerbosity > 0) RTMsgInfo("Checking '%s'...\n", pszImage); /* * Open the image. */ uint32_t offError; RTERRINFOSTATIC ErrInfo; RTLDRMOD hLdrMod; int rc = RTLdrOpenVfsChain(pszImage, RTLDR_O_FOR_DEBUG, RTLDRARCH_WHATEVER, &hLdrMod, &offError, RTErrInfoInitStatic(&ErrInfo)); if (RT_FAILURE(rc)) { if (RT_FAILURE(rc) && RTErrInfoIsSet(&ErrInfo.Core)) return RTMsgErrorRc(rc, "Failed opening image '%s': %Rrc - %s", pszImage, rc, ErrInfo.Core.pszMsg); return RTMsgErrorRc(rc, "Failed opening image '%s': %Rrc", pszImage, rc); } /* * Do the import modules first. */ uint32_t cImports = 0; rc = RTLdrQueryProp(hLdrMod, RTLDRPROP_IMPORT_COUNT, &cImports, sizeof(cImports)); if (RT_SUCCESS(rc)) { RTCHECKIMPORTSTATE *pState = (RTCHECKIMPORTSTATE *)RTMemAllocZ(RT_UOFFSETOF_DYN(RTCHECKIMPORTSTATE, aImports[cImports + 1])); if (pState) { pState->pszImage = pszImage; pState->pOpts = pOpts; pState->cImports = cImports; for (uint32_t iImport = 0; iImport < cImports; iImport++) pState->aImports[iImport].hLdrMod = NIL_RTLDRMOD; for (uint32_t iImport = 0; iImport < cImports; iImport++) { *(uint32_t *)&pState->aImports[iImport].szModule[0] = iImport; rc = RTLdrQueryProp(hLdrMod, RTLDRPROP_IMPORT_MODULE, pState->aImports[iImport].szModule, sizeof(pState->aImports[iImport].szModule)); if (RT_FAILURE(rc)) { RTMsgError("%s: Error querying import #%u: %Rrc", pszImage, iImport, rc); break; } rc = LoadImportModule(pOpts, &pState->aImports[iImport], &ErrInfo.Core, pszImage); if (RT_FAILURE(rc)) break; } if (RT_SUCCESS(rc)) { /* * Get the image bits, indirectly resolving imports. */ size_t cbImage = RTLdrSize(hLdrMod); void *pvImage = RTMemAllocZ(cbImage); if (pvImage) { pState->iRc = VINF_SUCCESS; rc = RTLdrGetBits(hLdrMod, pvImage, _4M, GetImportCallback, pState); if (RT_SUCCESS(rc)) rc = pState->iRc; else RTMsgError("%s: RTLdrGetBits failed: %Rrc", pszImage, rc); RTMemFree(pvImage); } else rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: out of memory", pszImage); } for (uint32_t iImport = 0; iImport < cImports; iImport++) if (pState->aImports[iImport].hLdrMod != NIL_RTLDRMOD) { RTLdrClose(pState->aImports[iImport].hLdrMod); size_t i = pState->aImports[iImport].cExports; while (i-- > 0) RTStrFree(pState->aImports[iImport].papszExports[i]); RTMemFree(pState->aImports[iImport].papszExports); } RTMemFree(pState); } else rc = RTMsgErrorRc(VERR_NO_MEMORY, "%s: out of memory", pszImage); } else RTMsgError("%s: Querying RTLDRPROP_IMPORT_COUNT failed: %Rrc", pszImage, rc); RTLdrClose(hLdrMod); return rc; } /** * @callback_method_impl{FNRTLDRENUMSYMS} */ static DECLCALLBACK(int) PrintSymbolForExportList(RTLDRMOD hLdrMod, const char *pszSymbol, unsigned uSymbol, RTLDRADDR Value, void *pvUser) { if (pszSymbol) RTPrintf("%s\n", pszSymbol); if (uSymbol != ~(unsigned)0 && (!pszSymbol || ((PCRTCHECKIMPORTSOPTS)pvUser)->fListOrdinals)) RTPrintf("#%u\n", uSymbol); RT_NOREF(hLdrMod, Value, pvUser); return VINF_SUCCESS; } /** * Produces the export list for the given image. * * @returns IPRT status code. * @param pOpts The check program options. * @param pszImage Path to the image. */ static int ProduceExportList(PCRTCHECKIMPORTSOPTS pOpts, const char *pszImage) { /* * Open the image. */ uint32_t offError; RTERRINFOSTATIC ErrInfo; RTLDRMOD hLdrMod; int rc = RTLdrOpenVfsChain(pszImage, RTLDR_O_FOR_DEBUG, RTLDRARCH_WHATEVER, &hLdrMod, &offError, RTErrInfoInitStatic(&ErrInfo)); if (RT_SUCCESS(rc)) { /* * Some info about the file. */ RTPrintf(";\n" "; Generated from: %s\n", pszImage); RTFSOBJINFO ObjInfo; rc = RTVfsChainQueryInfo(pszImage, &ObjInfo, RTFSOBJATTRADD_NOTHING, RTPATH_F_FOLLOW_LINK, NULL, NULL); if (RT_SUCCESS(rc)) RTPrintf("; Size file: %#RX64 (%RU64)\n", ObjInfo.cbObject, ObjInfo.cbObject); switch (RTLdrGetFormat(hLdrMod)) { case RTLDRFMT_AOUT: RTPrintf("; Format: a.out\n"); break; case RTLDRFMT_ELF: RTPrintf("; Format: ELF\n"); break; case RTLDRFMT_LX: RTPrintf("; Format: LX\n"); break; case RTLDRFMT_MACHO: RTPrintf("; Format: Mach-O\n"); break; case RTLDRFMT_PE: RTPrintf("; Format: PE\n"); break; default: RTPrintf("; Format: %u\n", RTLdrGetFormat(hLdrMod)); break; } RTPrintf("; Size of image: %#x (%u)\n", RTLdrSize(hLdrMod), RTLdrSize(hLdrMod)); switch (RTLdrGetArch(hLdrMod)) { case RTLDRARCH_AMD64: RTPrintf("; Architecture: AMD64\n"); break; case RTLDRARCH_X86_32: RTPrintf("; Architecture: X86\n"); break; default: RTPrintf("; Architecture: %u\n", RTLdrGetArch(hLdrMod)); break; } uint64_t uTimestamp; rc = RTLdrQueryProp(hLdrMod, RTLDRPROP_TIMESTAMP_SECONDS, &uTimestamp, sizeof(uTimestamp)); if (RT_SUCCESS(rc)) { RTTIMESPEC Timestamp; char szTime[128]; RTTimeSpecToString(RTTimeSpecSetSeconds(&Timestamp, uTimestamp), szTime, sizeof(szTime)); char *pszEnd = strchr(szTime, '\0'); while (pszEnd[0] != '.') pszEnd--; *pszEnd = '\0'; RTPrintf("; Timestamp: %#RX64 - %s\n", uTimestamp, szTime); } RTUUID ImageUuid; rc = RTLdrQueryProp(hLdrMod, RTLDRPROP_UUID, &ImageUuid, sizeof(ImageUuid)); if (RT_SUCCESS(rc)) RTPrintf("; UUID: %RTuuid\n", &ImageUuid); RTPrintf(";\n"); /* * The list of exports. */ rc = RTLdrEnumSymbols(hLdrMod, 0 /*fFlags*/, NULL, _4M, PrintSymbolForExportList, (void *)pOpts); if (RT_FAILURE(rc)) RTMsgError("%s: RTLdrEnumSymbols failed: %Rrc", pszImage, rc); /* done */ RTLdrClose(hLdrMod); } else if (RTErrInfoIsSet(&ErrInfo.Core)) RTMsgError("Failed opening image '%s': %Rrc - %s", pszImage, rc, ErrInfo.Core.pszMsg); else RTMsgError("Failed opening image '%s': %Rrc", pszImage, rc); return rc; } int main(int argc, char **argv) { int rc = RTR3InitExe(argc, &argv, 0); if (RT_FAILURE(rc)) return RTMsgInitFailure(rc); RTCHECKIMPORTSOPTS Opts; Opts.cPaths = 0; Opts.papszPaths = NULL; Opts.enmLdrArch = RTLDRARCH_WHATEVER; Opts.cVerbosity = 1; Opts.fListOrdinals = false; static const RTGETOPTDEF s_aOptions[] = { { "--path", 'p', RTGETOPT_REQ_STRING }, { "--export", 'e', RTGETOPT_REQ_STRING }, { "--list-ordinals", 'O', RTGETOPT_REQ_NOTHING }, { "--quiet", 'q', RTGETOPT_REQ_NOTHING }, { "--verbose", 'v', RTGETOPT_REQ_NOTHING }, }; RTGETOPTSTATE State; rc = RTGetOptInit(&State, argc, argv, s_aOptions, RT_ELEMENTS(s_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST); AssertRCReturn(rc, RTEXITCODE_FAILURE); RTEXITCODE rcExit = RTEXITCODE_SUCCESS; RTGETOPTUNION ValueUnion; while ((rc = RTGetOpt(&State, &ValueUnion)) != 0) { switch (rc) { case 'p': if ((Opts.cPaths % 16) == 0) { void *pvNew = RTMemRealloc(Opts.papszPaths, sizeof(Opts.papszPaths[0]) * (Opts.cPaths + 16)); AssertRCReturn(rc, RTEXITCODE_FAILURE); Opts.papszPaths = (char **)pvNew; } Opts.papszPaths[Opts.cPaths] = RTStrDup(ValueUnion.psz); AssertReturn(Opts.papszPaths[Opts.cPaths], RTEXITCODE_FAILURE); Opts.cPaths++; break; case 'e': rc = ProduceExportList(&Opts, ValueUnion.psz); if (RT_FAILURE(rc)) rcExit = RTEXITCODE_FAILURE; break; case 'O': Opts.fListOrdinals = true; break; case 'q': Opts.cVerbosity = 0; break; case 'v': Opts.cVerbosity = 0; break; case VINF_GETOPT_NOT_OPTION: rc = rtCheckImportsForImage(&Opts, ValueUnion.psz); if (RT_FAILURE(rc)) rcExit = RTEXITCODE_FAILURE; break; case 'h': RTPrintf("Usage: RTCheckImports [-p|--path ] [-v|--verbose] [-q|--quiet] \n" " or: RTCheckImports -e \n" " or: RTCheckImports <-h|--help>\n" " or: RTCheckImports <-V|--version>\n" "Checks library imports. VFS chain syntax supported.\n" "\n" "Options:\n" " -p, --path \n" " Search the specified directory for imported modules or their export lists.\n" " -e, --export \n" " Write export list for the file to stdout. (Redirect to a .export file.)\n" " -O, --list-ordinals\n" " Whether to list ordinals as well as names in the export list.\n" " -q, --quiet\n" " Quiet execution.\n" " -v, --verbose\n" " Increases verbosity.\n" "" ); return RTEXITCODE_SUCCESS; #ifndef IPRT_IN_BUILD_TOOL case 'V': RTPrintf("%sr%s\n", RTBldCfgVersion(), RTBldCfgRevisionStr()); return RTEXITCODE_SUCCESS; #endif default: return RTGetOptPrintError(rc, &ValueUnion); } } return rcExit; }