fresh git tree for public release
we regretfully had to remove our git history for licensing reasons Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
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Casey Bodley
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271 changed files with 71255 additions and 0 deletions
230
mount/options.c
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230
mount/options.c
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/* Copyright (c) 2010
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* The Regents of the University of Michigan
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* All Rights Reserved
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*
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* Permission is granted to use, copy and redistribute this software
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* for noncommercial education and research purposes, so long as no
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* fee is charged, and so long as the name of the University of Michigan
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* is not used in any advertising or publicity pertaining to the use
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* or distribution of this software without specific, written prior
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* authorization. Permission to modify or otherwise create derivative
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* works of this software is not granted.
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*
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* This software is provided as is, without representation or warranty
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* of any kind either express or implied, including without limitation
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* the implied warranties of merchantability, fitness for a particular
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* purpose, or noninfringement. The Regents of the University of
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* Michigan shall not be liable for any damages, including special,
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* indirect, incidental, or consequential damages, with respect to any
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* claim arising out of or in connection with the use of the software,
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* even if it has been or is hereafter advised of the possibility of
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* such damages.
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*/
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#include <Windows.h>
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#include <tchar.h>
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#include <strsafe.h>
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#include <stdio.h>
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#include "options.h"
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DWORD InitializeMountOptions(
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IN OUT PMOUNT_OPTION_LIST Options,
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IN ULONG BufferSize)
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{
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Options->Current = NULL;
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Options->Remaining = BufferSize;
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Options->Buffer = LocalAlloc(LMEM_ZEROINIT, BufferSize);
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if (Options->Buffer == NULL)
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return ERROR_OUTOFMEMORY;
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Options->Buffer->Secret = MOUNT_OPTION_BUFFER_SECRET;
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return NO_ERROR;
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}
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void FreeMountOptions(
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IN OUT PMOUNT_OPTION_LIST Options)
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{
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Options->Current = NULL;
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Options->Remaining = 0;
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if (Options->Buffer)
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{
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LocalFree(Options->Buffer);
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Options->Buffer = NULL;
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}
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}
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static BOOL FindOptionByName(
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IN LPCTSTR Name,
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IN PMOUNT_OPTION_LIST Options,
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OUT PFILE_FULL_EA_INFORMATION* ppOption)
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{
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PFILE_FULL_EA_INFORMATION Current =
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(PFILE_FULL_EA_INFORMATION)Options->Buffer->Buffer;
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ULONG NameLength = (ULONG)_tcslen(Name) * sizeof(TCHAR);
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for (;;)
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{
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if (Current->EaNameLength == NameLength &&
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_tcscmp((LPTSTR)Current->EaName, Name) == 0)
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{
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*ppOption = Current;
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return TRUE;
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}
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if (Current->NextEntryOffset == 0)
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break;
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Current = (PFILE_FULL_EA_INFORMATION)
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((PBYTE)Current + Current->NextEntryOffset);
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}
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return FALSE;
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}
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static FORCEINLINE ULONG EaBufferSize(
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IN UCHAR NameSize,
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IN USHORT ValueSize)
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{
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ULONG Size = sizeof(ULONG) + 2 * sizeof(UCHAR) + sizeof(USHORT)
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+ NameSize + ValueSize + sizeof(TCHAR);
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/* extended attributes require ULONG alignment;
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* see documentation for IoCheckEaBufferValidity() */
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return ( (Size + 3) / sizeof(ULONG) ) * sizeof(ULONG);
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}
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static FORCEINLINE ULONG EaBufferNextOffset(
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IN PFILE_FULL_EA_INFORMATION EaBuffer)
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{
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return EaBufferSize(
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EaBuffer->EaNameLength,
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EaBuffer->EaValueLength);
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}
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BOOL InsertOption(
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IN LPCTSTR Name,
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IN LPCTSTR Value,
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IN OUT PMOUNT_OPTION_LIST Options)
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{
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PFILE_FULL_EA_INFORMATION Current;
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UCHAR NameLen = (UCHAR)_tcslen(Name) * sizeof(TCHAR);
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USHORT ValueLen = (USHORT)_tcslen(Value) * sizeof(TCHAR);
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ULONG SpaceRequired = EaBufferSize(NameLen, ValueLen);
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/* don't allow duplicate options */
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if (FindOptionByName(Name, Options, &Current)) {
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_ftprintf(stderr, TEXT("Found a duplicate option ")
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TEXT("'%s%s%s' while parsing '%s%s%s'.\n"),
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(PTCH)Current->EaName,
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Current->EaValueLength ? TEXT("=") : TEXT(""),
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(PTCH)(Current->EaName + Current->EaNameLength + sizeof(TCHAR)),
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Name, ValueLen ? TEXT("=") : Value, Value);
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return FALSE;
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}
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/* fail if we're out of space */
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if (SpaceRequired > Options->Remaining) {
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_ftprintf(stderr, TEXT("Out of space for options!\n"));
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return FALSE;
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}
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if (Options->Current == NULL)
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Current = Options->Current = (PFILE_FULL_EA_INFORMATION)
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Options->Buffer->Buffer;
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else
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Current = Options->Current = (PFILE_FULL_EA_INFORMATION)
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((PBYTE)Options->Current + Options->Current->NextEntryOffset);
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Current->EaNameLength = NameLen;
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if (NameLen) /* copy attribute name */
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StringCbCopy((LPTSTR)Current->EaName,
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NameLen + sizeof(TCHAR), Name);
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Current->EaValueLength = ValueLen;
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if (ValueLen) /* copy attribute value */
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StringCbCopy((LPTSTR)(Current->EaName + NameLen + sizeof(TCHAR)),
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ValueLen + sizeof(TCHAR), Value);
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Current->Flags = 0;
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Current->NextEntryOffset = EaBufferNextOffset(Options->Current);
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Options->Buffer->Length = (ULONG)(
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(Current->EaName + NameLen + ValueLen + 2 * sizeof(TCHAR))
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- Options->Buffer->Buffer );
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Options->Remaining -= SpaceRequired;
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return TRUE;
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}
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static void RecursivePrintEaInformation(
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IN PFILE_FULL_EA_INFORMATION EA)
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{
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_tprintf(
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TEXT("----------------------\n")
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TEXT("Alignment: %5lu\n")
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TEXT("NextEntryOffset: %5lu\n")
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TEXT("Flags: %5u\n")
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TEXT("EaNameLength: %5u\n")
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TEXT("EaValueLength: %5u\n")
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TEXT("EaName: %16ls\n")
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TEXT("EaValue: %16ls\n\n"),
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(ULONG_PTR)EA % sizeof(ULONG),
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EA->NextEntryOffset,
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EA->Flags,
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EA->EaNameLength,
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EA->EaValueLength,
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(LPTSTR)EA->EaName,
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(LPTSTR)(EA->EaName + EA->EaNameLength + sizeof(TCHAR)));
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if (EA->NextEntryOffset)
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RecursivePrintEaInformation((PFILE_FULL_EA_INFORMATION)
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((PBYTE)EA + EA->NextEntryOffset));
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}
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static const TCHAR COMMA_T = TEXT(',');
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static const TCHAR EQUAL_T = TEXT('=');
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BOOL ParseMountOptions(
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IN LPTSTR Arg,
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IN OUT PMOUNT_OPTION_LIST Options)
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{
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PTCH pos, comma, equals;
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pos = Arg;
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for (;;)
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{
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comma = _tcschr(pos, COMMA_T);
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if (comma)
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{
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if (comma == pos)
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goto out_empty_option;
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*comma = 0;
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}
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else if (_tcslen(pos) == 0)
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goto out_empty_option;
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/* accept 'option=value' or 'option' */
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equals = _tcschr(pos, EQUAL_T);
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if (equals)
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{
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if (equals == pos)
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goto out_empty_option;
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*equals = 0;
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if (!InsertOption(pos, equals + 1, Options))
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return FALSE;
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}
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else if (!InsertOption(pos, TEXT(""), Options))
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return FALSE;
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if (comma == NULL)
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break;
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pos = comma + 1;
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}
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/* RecursivePrintEaInformation(
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(PFILE_FULL_EA_INFORMATION)Options->Buffer->Buffer); */
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return TRUE;
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out_empty_option:
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_ftprintf(stderr, TEXT("Found an empty option while ")
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TEXT("reading mount options at '%s'.\n"), pos);
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return FALSE;
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}
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