/* $Id: RTPathRmCmd.cpp $ */ /** @file * IPRT - RM Command. */ /* * Copyright (C) 2013-2019 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 * *********************************************************************************************************************************/ #include <iprt/path.h> #include <iprt/buildconfig.h> #include <iprt/ctype.h> #include <iprt/err.h> #include <iprt/file.h> #include <iprt/dir.h> #include <iprt/getopt.h> #include <iprt/initterm.h> #include <iprt/message.h> #include <iprt/stream.h> #include <iprt/string.h> #include <iprt/symlink.h> /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ #define RTPATHRMCMD_OPT_INTERACTIVE 1000 #define RTPATHRMCMD_OPT_ONE_FILE_SYSTEM 1001 #define RTPATHRMCMD_OPT_PRESERVE_ROOT 1002 #define RTPATHRMCMD_OPT_NO_PRESERVE_ROOT 1003 #define RTPATHRMCMD_OPT_MACHINE_READABLE 1004 /** The max directory entry size. */ #define RTPATHRM_DIR_MAX_ENTRY_SIZE (sizeof(RTDIRENTRYEX) + 4096) /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** Interactive option. */ typedef enum { RTPATHRMCMDINTERACTIVE_NONE = 1, RTPATHRMCMDINTERACTIVE_ALL, RTPATHRMCMDINTERACTIVE_ONCE /** @todo possible that we should by default prompt if removing read-only * files or files owned by someone else. We currently don't. */ } RTPATHRMCMDINTERACTIVE; /** * IPRT rm option structure. */ typedef struct RTPATHRMCMDOPTS { /** Whether to delete recursively. */ bool fRecursive; /** Whether to delete directories as well as other kinds of files. */ bool fDirsAndOther; /** Whether to remove files without prompting and ignoring non-existing * files. */ bool fForce; /** Machine readable output. */ bool fMachineReadable; /** Don't try remove root ('/') if set, otherwise don't treat root specially. */ bool fPreserveRoot; /** Whether to keep to one file system. */ bool fOneFileSystem; /** Whether to safely delete files (overwrite 3x before unlinking). */ bool fSafeDelete; /** Whether to be verbose about the operation. */ bool fVerbose; /** The interactive setting. */ RTPATHRMCMDINTERACTIVE enmInteractive; } RTPATHRMCMDOPTS; /** Pointer to the IPRT rm options. */ typedef RTPATHRMCMDOPTS *PRTPATHRMCMDOPTS; /********************************************************************************************************************************* * Global Variables * *********************************************************************************************************************************/ /** A bunch of zeros. */ static uint8_t const g_abZeros[16384] = { 0 }; /** A bunch of 0xFF bytes. (lazy init) */ static uint8_t g_ab0xFF[16384]; static void rtPathRmVerbose(PRTPATHRMCMDOPTS pOpts, const char *pszPath) { if (!pOpts->fMachineReadable) RTPrintf("%s\n", pszPath); } static int rtPathRmError(PRTPATHRMCMDOPTS pOpts, const char *pszPath, int rc, const char *pszFormat, ...) { if (pOpts->fMachineReadable) RTPrintf("fname=%s%crc=%d%c", pszPath, 0, rc, 0); else { va_list va; va_start(va, pszFormat); RTMsgErrorV(pszFormat, va); va_end(va); } return rc; } /** * Worker that removes a symbolic link. * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath The path to the symbolic link. */ static int rtPathRmOneSymlink(PRTPATHRMCMDOPTS pOpts, const char *pszPath) { if (pOpts->fVerbose) rtPathRmVerbose(pOpts, pszPath); int rc = RTSymlinkDelete(pszPath, 0); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "Error removing symbolic link '%s': %Rrc\n", pszPath, rc); return rc; } /** * Worker that removes a file. * * Currently used to delete both regular and special files. * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath The path to the file. * @param pObjInfo The FS object info for the file. */ static int rtPathRmOneFile(PRTPATHRMCMDOPTS pOpts, const char *pszPath, PRTFSOBJINFO pObjInfo) { int rc; if (pOpts->fVerbose) rtPathRmVerbose(pOpts, pszPath); /* * Wipe the file if requested and possible. */ if (pOpts->fSafeDelete && RTFS_IS_FILE(pObjInfo->Attr.fMode)) { /* Lazy init of the 0xff buffer. */ if (g_ab0xFF[0] != 0xff || g_ab0xFF[sizeof(g_ab0xFF) - 1] != 0xff) memset(g_ab0xFF, 0xff, sizeof(g_ab0xFF)); RTFILE hFile; rc = RTFileOpen(&hFile, pszPath, RTFILE_O_WRITE); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "Opening '%s' for overwriting: %Rrc\n", pszPath, rc); for (unsigned iPass = 0; iPass < 3; iPass++) { uint8_t const *pabFiller = iPass == 1 ? g_abZeros : g_ab0xFF; size_t const cbFiller = iPass == 1 ? sizeof(g_abZeros) : sizeof(g_ab0xFF); rc = RTFileSeek(hFile, 0, RTFILE_SEEK_BEGIN, NULL); if (RT_FAILURE(rc)) { rc = rtPathRmError(pOpts, pszPath, rc, "Error seeking to start of '%s': %Rrc\n", pszPath, rc); break; } for (RTFOFF cbLeft = pObjInfo->cbObject; cbLeft > 0; cbLeft -= cbFiller) { size_t cbToWrite = cbFiller; if (cbLeft < (RTFOFF)cbToWrite) cbToWrite = (size_t)cbLeft; rc = RTFileWrite(hFile, pabFiller, cbToWrite, NULL); if (RT_FAILURE(rc)) { rc = rtPathRmError(pOpts, pszPath, rc, "Error writing to '%s': %Rrc\n", pszPath, rc); break; } } } int rc2 = RTFileClose(hFile); if (RT_FAILURE(rc2) && RT_SUCCESS(rc)) return rtPathRmError(pOpts, pszPath, rc2, "Closing '%s' failed: %Rrc\n", pszPath, rc); if (RT_FAILURE(rc)) return rc; } /* * Remove the file. */ rc = RTFileDelete(pszPath); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, RTFS_IS_FILE(pObjInfo->Attr.fMode) ? "Error removing regular file '%s': %Rrc\n" : "Error removing special file '%s': %Rrc\n", pszPath, rc); return rc; } /** * Deletes one directory (if it's empty). * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath The path to the directory. */ static int rtPathRmOneDir(PRTPATHRMCMDOPTS pOpts, const char *pszPath) { if (pOpts->fVerbose) rtPathRmVerbose(pOpts, pszPath); int rc = RTDirRemove(pszPath); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "Error removing directory '%s': %Rrc", pszPath, rc); return rc; } /** * Recursively delete a directory. * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath Pointer to a writable buffer holding the path to * the directory. * @param cchPath The length of the path (avoid strlen). * @param pDirEntry Pointer to a directory entry buffer that is * RTPATHRM_DIR_MAX_ENTRY_SIZE bytes big. */ static int rtPathRmRecursive(PRTPATHRMCMDOPTS pOpts, char *pszPath, size_t cchPath, PRTDIRENTRYEX pDirEntry) { /* * Make sure the path ends with a slash. */ if (!cchPath || !RTPATH_IS_SLASH(pszPath[cchPath - 1])) { if (cchPath + 1 >= RTPATH_MAX) return rtPathRmError(pOpts, pszPath, VERR_BUFFER_OVERFLOW, "Buffer overflow fixing up '%s'.\n", pszPath); pszPath[cchPath++] = RTPATH_SLASH; pszPath[cchPath] = '\0'; } /* * Traverse the directory. */ RTDIR hDir; int rc = RTDirOpen(&hDir, pszPath); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "Error opening directory '%s': %Rrc", pszPath, rc); int rcRet = VINF_SUCCESS; for (;;) { /* * Read the next entry, constructing an full path for it. */ size_t cbEntry = RTPATHRM_DIR_MAX_ENTRY_SIZE; rc = RTDirReadEx(hDir, pDirEntry, &cbEntry, RTFSOBJATTRADD_NOTHING, RTPATH_F_ON_LINK); if (rc == VERR_NO_MORE_FILES) { /* * Reached the end of the directory. */ pszPath[cchPath] = '\0'; rc = RTDirClose(hDir); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "Error closing directory '%s': %Rrc", pszPath, rc); /* Delete the directory. */ int rc2 = rtPathRmOneDir(pOpts, pszPath); if (RT_FAILURE(rc2) && RT_SUCCESS(rcRet)) return rc2; return rcRet; } if (RT_FAILURE(rc)) { rc = rtPathRmError(pOpts, pszPath, rc, "Error reading directory '%s': %Rrc", pszPath, rc); break; } /* Skip '.' and '..'. */ if ( pDirEntry->szName[0] == '.' && ( pDirEntry->cbName == 1 || ( pDirEntry->cbName == 2 && pDirEntry->szName[1] == '.'))) continue; /* Construct full path. */ if (cchPath + pDirEntry->cbName >= RTPATH_MAX) { pszPath[cchPath] = '\0'; rc = rtPathRmError(pOpts, pszPath, VERR_BUFFER_OVERFLOW, "Path buffer overflow in directory '%s'.", pszPath); break; } memcpy(pszPath + cchPath, pDirEntry->szName, pDirEntry->cbName + 1); /* * Take action according to the type. */ switch (pDirEntry->Info.Attr.fMode & RTFS_TYPE_MASK) { case RTFS_TYPE_FILE: rc = rtPathRmOneFile(pOpts, pszPath, &pDirEntry->Info); break; case RTFS_TYPE_DIRECTORY: rc = rtPathRmRecursive(pOpts, pszPath, cchPath + pDirEntry->cbName, pDirEntry); break; case RTFS_TYPE_SYMLINK: rc = rtPathRmOneSymlink(pOpts, pszPath); break; case RTFS_TYPE_FIFO: case RTFS_TYPE_DEV_CHAR: case RTFS_TYPE_DEV_BLOCK: case RTFS_TYPE_SOCKET: rc = rtPathRmOneFile(pOpts, pszPath, &pDirEntry->Info); break; case RTFS_TYPE_WHITEOUT: default: rc = rtPathRmError(pOpts, pszPath, VERR_UNEXPECTED_FS_OBJ_TYPE, "Object '%s' has an unknown file type: %o\n", pszPath, pDirEntry->Info.Attr.fMode & RTFS_TYPE_MASK); break; } if (RT_FAILURE(rc) && RT_SUCCESS(rcRet)) rcRet = rc; } /* * Some error occured, close and return. */ RTDirClose(hDir); return rc; } /** * Validates the specified file or directory. * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath The path to the file, directory, whatever. */ static int rtPathRmOneValidate(PRTPATHRMCMDOPTS pOpts, const char *pszPath) { /* * RTPathFilename doesn't do the trailing slash thing the way we need it to. * E.g. both '..' and '../' should be rejected. */ size_t cchPath = strlen(pszPath); while (cchPath > 0 && RTPATH_IS_SLASH(pszPath[cchPath - 1])) cchPath--; if ( ( cchPath == 0 || 0 /** @todo drive letter + UNC crap */) && pOpts->fPreserveRoot) return rtPathRmError(pOpts, pszPath, VERR_CANT_DELETE_DIRECTORY, "Cannot remove root directory ('%s').\n", pszPath); size_t offLast = cchPath - 1; while (offLast > 0 && !RTPATH_IS_SEP(pszPath[offLast - 1])) offLast--; size_t cchLast = cchPath - offLast; if ( pszPath[offLast] == '.' && ( cchLast == 1 || (cchLast == 2 && pszPath[offLast + 1] == '.'))) return rtPathRmError(pOpts, pszPath, VERR_CANT_DELETE_DIRECTORY, "Cannot remove special directory '%s'.\n", pszPath); return VINF_SUCCESS; } /** * Remove one user specified file or directory. * * @returns IPRT status code, errors go via rtPathRmError. * @param pOpts The RM options. * @param pszPath The path to the file, directory, whatever. */ static int rtPathRmOne(PRTPATHRMCMDOPTS pOpts, const char *pszPath) { /* * RM refuses to delete some directories. */ int rc = rtPathRmOneValidate(pOpts, pszPath); if (RT_FAILURE(rc)) return rc; /* * Query file system object info. */ RTFSOBJINFO ObjInfo; rc = RTPathQueryInfoEx(pszPath, &ObjInfo, RTFSOBJATTRADD_UNIX, RTPATH_F_ON_LINK); if (RT_FAILURE(rc)) { if (pOpts->fForce && (rc == VERR_FILE_NOT_FOUND || rc == VERR_PATH_NOT_FOUND)) return VINF_SUCCESS; return rtPathRmError(pOpts, pszPath, rc, "Error deleting '%s': %Rrc", pszPath, rc); } /* * Take type specific action. */ switch (ObjInfo.Attr.fMode & RTFS_TYPE_MASK) { case RTFS_TYPE_FILE: return rtPathRmOneFile(pOpts, pszPath, &ObjInfo); case RTFS_TYPE_DIRECTORY: if (pOpts->fRecursive) { char szPath[RTPATH_MAX]; rc = RTPathAbs(pszPath, szPath, sizeof(szPath)); if (RT_FAILURE(rc)) return rtPathRmError(pOpts, pszPath, rc, "RTPathAbs failed on '%s': %Rrc\n", pszPath, rc); union { RTDIRENTRYEX Core; uint8_t abPadding[RTPATHRM_DIR_MAX_ENTRY_SIZE]; } DirEntry; return rtPathRmRecursive(pOpts, szPath, strlen(szPath), &DirEntry.Core); } if (pOpts->fDirsAndOther) return rtPathRmOneDir(pOpts, pszPath); return rtPathRmError(pOpts, pszPath, VERR_IS_A_DIRECTORY, "Cannot remove '%s': %Rrc\n", pszPath, VERR_IS_A_DIRECTORY); case RTFS_TYPE_SYMLINK: return rtPathRmOneSymlink(pOpts, pszPath); case RTFS_TYPE_FIFO: case RTFS_TYPE_DEV_CHAR: case RTFS_TYPE_DEV_BLOCK: case RTFS_TYPE_SOCKET: return rtPathRmOneFile(pOpts, pszPath, &ObjInfo); case RTFS_TYPE_WHITEOUT: default: return rtPathRmError(pOpts, pszPath, VERR_UNEXPECTED_FS_OBJ_TYPE, "Object '%s' has an unknown file type: %o\n", pszPath, ObjInfo.Attr.fMode & RTFS_TYPE_MASK); } } RTDECL(RTEXITCODE) RTPathRmCmd(unsigned cArgs, char **papszArgs) { /* * Parse the command line. */ static const RTGETOPTDEF s_aOptions[] = { /* operations */ { "--dirs-and-more", 'd', RTGETOPT_REQ_NOTHING }, { "--force", 'f', RTGETOPT_REQ_NOTHING }, { "--prompt", 'i', RTGETOPT_REQ_NOTHING }, { "--prompt-once", 'I', RTGETOPT_REQ_NOTHING }, { "--interactive", RTPATHRMCMD_OPT_INTERACTIVE, RTGETOPT_REQ_STRING }, { "--one-file-system", RTPATHRMCMD_OPT_ONE_FILE_SYSTEM, RTGETOPT_REQ_NOTHING }, { "--preserve-root", RTPATHRMCMD_OPT_PRESERVE_ROOT, RTGETOPT_REQ_NOTHING }, { "--no-preserve-root", RTPATHRMCMD_OPT_NO_PRESERVE_ROOT, RTGETOPT_REQ_NOTHING }, { "--recursive", 'R', RTGETOPT_REQ_NOTHING }, { "--recursive", 'r', RTGETOPT_REQ_NOTHING }, { "--safe-delete", 'P', RTGETOPT_REQ_NOTHING }, { "--verbose", 'v', RTGETOPT_REQ_NOTHING }, /* IPRT extensions */ { "--machine-readable", RTPATHRMCMD_OPT_MACHINE_READABLE, RTGETOPT_REQ_NOTHING }, { "--machinereadable", RTPATHRMCMD_OPT_MACHINE_READABLE, RTGETOPT_REQ_NOTHING }, /* bad long option style */ }; RTGETOPTSTATE GetState; int rc = RTGetOptInit(&GetState, cArgs, papszArgs, s_aOptions, RT_ELEMENTS(s_aOptions), 1, RTGETOPTINIT_FLAGS_OPTS_FIRST); if (RT_FAILURE(rc)) return RTMsgErrorExit(RTEXITCODE_FAILURE, "RTGetOpt failed: %Rrc", rc); RTPATHRMCMDOPTS Opts; RT_ZERO(Opts); Opts.fPreserveRoot = true; Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_NONE; RTGETOPTUNION ValueUnion; while ( (rc = RTGetOpt(&GetState, &ValueUnion)) != 0 && rc != VINF_GETOPT_NOT_OPTION) { switch (rc) { case 'd': Opts.fDirsAndOther = true; break; case 'f': Opts.fForce = true; Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_NONE; break; case 'i': Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ALL; break; case 'I': Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ONCE; break; case RTPATHRMCMD_OPT_INTERACTIVE: if (!strcmp(ValueUnion.psz, "always")) Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ALL; else if (!strcmp(ValueUnion.psz, "once")) Opts.enmInteractive = RTPATHRMCMDINTERACTIVE_ONCE; else return RTMsgErrorExit(RTEXITCODE_SYNTAX, "Unknown --interactive option value: '%s'\n", ValueUnion.psz); break; case RTPATHRMCMD_OPT_ONE_FILE_SYSTEM: Opts.fOneFileSystem = true; break; case RTPATHRMCMD_OPT_PRESERVE_ROOT: Opts.fPreserveRoot = true; break; case RTPATHRMCMD_OPT_NO_PRESERVE_ROOT: Opts.fPreserveRoot = false; break; case 'R': case 'r': Opts.fRecursive = true; Opts.fDirsAndOther = true; break; case 'P': Opts.fSafeDelete = true; break; case 'v': Opts.fVerbose = true; break; case RTPATHRMCMD_OPT_MACHINE_READABLE: Opts.fMachineReadable = true; break; case 'h': RTPrintf("Usage: to be written\nOption dump:\n"); for (unsigned i = 0; i < RT_ELEMENTS(s_aOptions); i++) if (RT_C_IS_PRINT(s_aOptions[i].iShort)) RTPrintf(" -%c,%s\n", s_aOptions[i].iShort, s_aOptions[i].pszLong); else RTPrintf(" %s\n", s_aOptions[i].pszLong); return RTEXITCODE_SUCCESS; case 'V': RTPrintf("%sr%d\n", RTBldCfgVersion(), RTBldCfgRevision()); return RTEXITCODE_SUCCESS; default: return RTGetOptPrintError(rc, &ValueUnion); } } /* * Options we don't support. */ if (Opts.fOneFileSystem) return RTMsgErrorExit(RTEXITCODE_FAILURE, "The --one-file-system option is not yet implemented.\n"); if (Opts.enmInteractive != RTPATHRMCMDINTERACTIVE_NONE) return RTMsgErrorExit(RTEXITCODE_FAILURE, "The -i, -I and --interactive options are not implemented yet.\n"); /* * No files means error. */ if (rc != VINF_GETOPT_NOT_OPTION && !Opts.fForce) return RTMsgErrorExit(RTEXITCODE_FAILURE, "No files or directories specified.\n"); /* * Machine readable init + header. */ if (Opts.fMachineReadable) { int rc2 = RTStrmSetMode(g_pStdOut, true /*fBinary*/, false /*fCurrentCodeSet*/); if (RT_FAILURE(rc2)) return RTMsgErrorExit(RTEXITCODE_FAILURE, "RTStrmSetMode failed: %Rrc.\n", rc2); static const char s_achHeader[] = "hdr_id=rm\0hdr_ver=1"; RTStrmWrite(g_pStdOut, s_achHeader, sizeof(s_achHeader)); } /* * Delete the specified files/dirs/whatever. */ RTEXITCODE rcExit = RTEXITCODE_SUCCESS; while (rc == VINF_GETOPT_NOT_OPTION) { rc = rtPathRmOne(&Opts, ValueUnion.psz); if (RT_FAILURE(rc)) rcExit = RTEXITCODE_FAILURE; /* next */ rc = RTGetOpt(&GetState, &ValueUnion); } if (rc != 0) rcExit = RTGetOptPrintError(rc, &ValueUnion); /* * Terminate the machine readable stuff. */ if (Opts.fMachineReadable) { RTStrmWrite(g_pStdOut, "\0\0\0", 4); rc = RTStrmFlush(g_pStdOut); if (RT_FAILURE(rc) && rcExit == RTEXITCODE_SUCCESS) rcExit = RTEXITCODE_FAILURE; } return rcExit; }