forked from osmocom/wireshark
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/* tempfile.c
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* Routines to create temporary files
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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#include <windows.h>
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#endif
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#include "tempfile.h"
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#include "mkstemp.h"
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#include <wsutil/file_util.h>
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static const char *
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setup_tmpdir(const char *dir)
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{
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size_t len = strlen(dir);
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char *newdir;
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/* Append path separator if necessary */
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if (len != 0 && dir[len - 1] == G_DIR_SEPARATOR) {
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return dir;
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}
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else {
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newdir = g_strdup_printf("%s%s", dir, G_DIR_SEPARATOR_S);
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return newdir;
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}
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}
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static int
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try_tempfile(char *namebuf, int namebuflen, const char *dir, const char *pfx)
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{
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static const char suffix[] = "XXXXXXXXXX";
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int namelen = strlen(dir) + strlen(pfx) + sizeof suffix;
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int old_umask;
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int tmp_fd;
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g_snprintf(namebuf, namebuflen, "%s%s%s", dir, pfx, suffix);
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if (namebuflen < namelen) {
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/* Stick with the truncated name, so that if this error is
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reported with the file name, you at least get
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something. */
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errno = ENAMETOOLONG;
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return -1;
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}
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/* The Single UNIX Specification doesn't say that "mkstemp()"
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creates the temporary file with mode rw-------, so we
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won't assume that all UNIXes will do so; instead, we set
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the umask to 0077 to take away all group and other
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permissions, attempt to create the file, and then put
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the umask back. */
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old_umask = umask(0077);
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tmp_fd = mkstemp(namebuf);
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umask(old_umask);
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return tmp_fd;
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}
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static const char *tmpdir = NULL;
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#ifdef _WIN32
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static const char *temp = NULL;
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#endif
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static const char *E_tmpdir;
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#ifndef P_tmpdir
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#define P_tmpdir "/var/tmp"
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#endif
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int
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create_tempfile(char *namebuf, int namebuflen, const char *pfx)
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{
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char *dir;
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int fd;
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static gboolean initialized;
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if (!initialized) {
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if ((dir = getenv("TMPDIR")) != NULL)
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tmpdir = setup_tmpdir(dir);
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#ifdef _WIN32
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if ((dir = getenv("TEMP")) != NULL)
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temp = setup_tmpdir(dir);
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#endif
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E_tmpdir = setup_tmpdir(P_tmpdir);
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initialized = TRUE;
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}
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if (tmpdir != NULL) {
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fd = try_tempfile(namebuf, namebuflen, tmpdir, pfx);
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if (fd != -1)
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return fd;
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}
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#ifdef _WIN32
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if (temp != NULL) {
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fd = try_tempfile(namebuf, namebuflen, temp, pfx);
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if (fd != -1)
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return fd;
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}
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#endif
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fd = try_tempfile(namebuf, namebuflen, E_tmpdir, pfx);
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if (fd != -1)
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return fd;
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return try_tempfile(namebuf, namebuflen, G_DIR_SEPARATOR_S "tmp", pfx);
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}
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