262 lines
6.4 KiB
C
262 lines
6.4 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <time.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_FCNTL_H
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#include <fcntl.h>
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#endif
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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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#ifdef _WIN32
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#include <process.h> /* For getpid() */
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#endif
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#include "tempfile.h"
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#include <wsutil/file_util.h>
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#ifndef __set_errno
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#define __set_errno(x) errno=(x)
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#endif
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#define INITIAL_PATH_SIZE 128
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#define TMP_FILE_SUFFIX "XXXXXX"
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#ifndef HAVE_MKSTEMP
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/* Generate a unique temporary file name from TEMPLATE.
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The last six characters of TEMPLATE must be TMP_FILE_SUFFIX;
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they are replaced with a string that makes the filename unique.
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Returns a file descriptor open on the file for reading and writing. */
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static int
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mkstemp (char *template)
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{
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static const char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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size_t len;
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size_t i;
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len = strlen (template);
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if (len < 6 || strcmp (&template[len - 6], TMP_FILE_SUFFIX))
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (g_snprintf (&template[len - 5], 6, "%.5u",
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(unsigned int) getpid () % 100000) != 5)
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/* Inconceivable lossage. */
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return -1;
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for (i = 0; i < sizeof (letters); ++i)
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{
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int fd;
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template[len - 6] = letters[i];
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fd = ws_open (template, O_RDWR|O_BINARY|O_CREAT|O_EXCL, 0600);
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if (fd >= 0)
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return fd;
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}
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/* We return the null string if we can't find a unique file name. */
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template[0] = '\0';
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return -1;
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}
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#endif /* HAVE_MKSTEMP */
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#ifndef HAVE_MKDTEMP
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/* Generate a unique temporary directory name from TEMPLATE.
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The last six characters of TEMPLATE must be TMP_FILE_SUFFIX;
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they are replaced with a string that makes the filename unique.
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Returns 0 on success or -1 on error (from mkdir(2)). */
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char *
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mkdtemp (char *template)
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{
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static const char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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size_t len;
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size_t i;
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len = strlen (template);
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if (len < 6 || strcmp (&template[len - 6], TMP_FILE_SUFFIX))
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{
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__set_errno (EINVAL);
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return NULL;
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}
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if (g_snprintf (&template[len - 5], 6, "%.5u",
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(unsigned int) getpid () % 100000) != 5)
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/* Inconceivable lossage. */
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return NULL;
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for (i = 0; i < sizeof (letters); ++i)
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{
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int ret;
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template[len - 6] = letters[i];
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ret = ws_mkdir(template, 0700);
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if (ret >= 0)
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return template;
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}
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/* We return the null string if we can't find a unique file name. */
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template[0] = '\0';
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return NULL;
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}
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#endif /* HAVE_MKDTEMP */
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#define MAX_TEMPFILES 3
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/**
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* Create a tempfile with the given prefix (e.g. "wireshark").
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*
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* @param namebuf If not NULL, receives the full path of the temp file.
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* Should NOT be freed.
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* @param pfx A prefix for the temporary file.
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* @return The file descriptor of the new tempfile, from mkstemp().
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*/
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int
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create_tempfile(char **namebuf, const char *pfx)
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{
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static struct _tf {
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char *path;
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unsigned long len;
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} tf[MAX_TEMPFILES];
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static int idx;
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const char *tmp_dir;
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int old_umask;
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int fd;
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time_t current_time;
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char timestr[14 + 1];
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gchar *tmp_file;
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gchar sep[2] = {0, 0};
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idx = (idx + 1) % MAX_TEMPFILES;
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/*
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* Allocate the buffer if it's not already allocated.
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*/
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if (tf[idx].path == NULL) {
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tf[idx].len = INITIAL_PATH_SIZE;
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tf[idx].path = (char *)g_malloc(tf[idx].len);
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}
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/*
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* We can't use get_tempfile_path here because we're called from dumpcap.c.
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*/
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tmp_dir = g_get_tmp_dir();
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#ifdef _WIN32
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_tzset();
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#endif
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current_time = time(NULL);
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strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(¤t_time));
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sep[0] = G_DIR_SEPARATOR;
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tmp_file = g_strconcat(tmp_dir, sep, pfx, "_", timestr, "_", TMP_FILE_SUFFIX, NULL);
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if (strlen(tmp_file) > tf[idx].len) {
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tf[idx].len = (int)strlen(tmp_file) + 1;
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tf[idx].path = (char *)g_realloc(tf[idx].path, tf[idx].len);
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}
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g_strlcpy(tf[idx].path, tmp_file, tf[idx].len);
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g_free(tmp_file);
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if (namebuf) {
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*namebuf = tf[idx].path;
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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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fd = mkstemp(tf[idx].path);
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umask(old_umask);
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return fd;
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}
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/**
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* Create a directory with the given prefix (e.g. "wireshark"). The path
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* is created using g_get_tmp_dir and mkdtemp.
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*
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* @param namebuf
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* @param pfx A prefix for the temporary directory.
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* @return The temporary directory path on success, or NULL on failure.
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* Must NOT be freed.
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*/
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const char *
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create_tempdir(char **namebuf, const char *pfx)
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{
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static char *td_path[3];
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static int td_path_len[3];
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static int idx;
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const char *tmp_dir;
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idx = (idx + 1) % 3;
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/*
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* Allocate the buffer if it's not already allocated.
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*/
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if (td_path[idx] == NULL) {
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td_path_len[idx] = INITIAL_PATH_SIZE;
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td_path[idx] = (char *)g_malloc(td_path_len[idx]);
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}
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/*
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* We can't use get_tempfile_path here because we're called from dumpcap.c.
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*/
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tmp_dir = g_get_tmp_dir();
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while (g_snprintf(td_path[idx], td_path_len[idx], "%s%c%s" TMP_FILE_SUFFIX, tmp_dir, G_DIR_SEPARATOR, pfx) > td_path_len[idx]) {
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td_path_len[idx] *= 2;
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td_path[idx] = (char *)g_realloc(td_path[idx], td_path_len[idx]);
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}
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if (namebuf) {
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*namebuf = td_path[idx];
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}
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return mkdtemp(td_path[idx]);
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}
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