141 lines
3.1 KiB
C
141 lines
3.1 KiB
C
/*
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* Scyther : An automatic verifier for security protocols.
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* Copyright (C) 2007-2013 Cas Cremers
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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/**
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*
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* @file tempfile.c
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*
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* Generate a temporary file stream
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*
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* Before Vista this was trivial, more or less. However Vista restricts access
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* so much that this call usually breaks, which is a pretty annoying bug.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef FORWINDOWS
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <io.h>
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#endif
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#include "bool.h"
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#include "symbol.h"
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#include "error.h"
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//! Create a new temporary file and return the pointer.
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/**
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* Before Vista this was trivial, more or less. However Vista restricts access
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* so much that this call usually breaks, which is a pretty annoying bug.
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*
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* See e.g., http://msdn2.microsoft.com/en-us/library/aa363875.aspx
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*/
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#ifdef FORWINDOWS
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/*
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* tmpfile() replacement for Windows Vista (and later?)
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*/
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FILE *
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win32_tmpfile (void)
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{
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DWORD pathlength;
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WCHAR path[MAX_PATH + 1];
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pathlength = GetTempPathW (MAX_PATH, path);
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if ((pathlength > 0) && (pathlength < MAX_PATH))
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{
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WCHAR filename[MAX_PATH + 1];
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if (GetTempFileNameW (path, L"scyther_", 0, filename) != 0)
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{
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HANDLE handle;
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handle = CreateFileW (filename,
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GENERIC_READ | GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL |
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FILE_FLAG_DELETE_ON_CLOSE, NULL);
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if (handle != INVALID_HANDLE_VALUE)
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{
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int fd;
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fd = _open_osfhandle ((intptr_t) handle, 0);
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if (fd < 0)
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{
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CloseHandle (handle);
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}
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else
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{
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FILE *fp;
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fp = fdopen (fd, "w+b");
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if (fp == NULL)
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{
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_close (fd);
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}
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else
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{
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// Return a real filepointer
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return fp;
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}
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}
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}
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else
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{
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DeleteFileW (filename);
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}
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}
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}
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return NULL;
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}
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#endif
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//! Create a tempfile
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/**
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* Returns a filepointer to an open temporary file.
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*
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* Really, this should always work and the calling code should not be required
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* to check for errors (such as fp=NULL). We therefore simply throw an error
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* if the underlying code returns NULL.
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*/
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FILE *
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scyther_tempfile (void)
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{
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FILE *fp;
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#ifdef FORWINDOWS
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/* Do special version because of M$ breaking tmpfile in Vista */
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fp = win32_tmpfile ();
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#else
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/* On any other platform the normal stuff just works (tm) */
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fp = tmpfile ();
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#endif
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if (fp == NULL)
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{
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error
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("Attempt at creating a temporary file failed for unknown reasons.");
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}
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return fp;
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}
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