191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/* tempfile.c
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* Routines to create temporary files
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef _WIN32
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#include <windows.h>
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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_MKSTEMPS
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/* Generate a unique temporary file name from TEMPLATE.
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The last six characters before the suffix length of TEMPLATE
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must be TMP_FILE_SUFFIX; they are replaced with a string that
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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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mkstemps(char *path_template, int suffixlen)
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{
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static const char letters[]
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= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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char uniqueness[6];
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size_t len;
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size_t i;
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len = strlen (path_template);
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if (len < 6 || strncmp (&path_template[len - 6 - suffixlen], TMP_FILE_SUFFIX, 6))
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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 (uniqueness, 6, "%.5u",
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(unsigned int) ws_getpid () % 100000) != 5)
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/* Inconceivable lossage. */
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return -1;
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memcpy(&path_template[len - 5 - suffixlen], uniqueness, 5);
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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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path_template[len - 6 - suffixlen] = letters[i];
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fd = ws_open (path_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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path_template[0] = '\0';
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return -1;
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}
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#endif /* HAVE_MKSTEMPS */
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/*
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* Construct and return the path name of a file in the
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* appropriate temporary file directory.
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*/
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char *get_tempfile_path(const char *filename)
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{
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return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", g_get_tmp_dir(), filename);
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}
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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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* @param sfx [in] A file extension for the temporary file. NULL can be passed
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* if no file extension is needed
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* @return The file descriptor of the new tempfile, from mkstemps().
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*/
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int
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create_tempfile(char **namebuf, const char *pfx, const char *sfx)
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{
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static struct _tf {
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char *path;
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size_t 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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struct tm *tm;
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char timestr[14 + 1];
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gchar *tmp_file;
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gchar *safe_pfx;
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gchar sep[2] = {0, 0};
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/* The characters in "delimiters" come from:
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* https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions.
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* Add to the list as necessary for other OS's.
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*/
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const gchar *delimiters = "<>:\"/\\|?*"
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"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a"
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"\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14"
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"\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f";
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/* Sanitize the pfx to resolve bug 7877 */
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safe_pfx = g_strdup(pfx);
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safe_pfx = g_strdelimit(safe_pfx, delimiters, '-');
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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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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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tm = localtime(¤t_time);
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if (tm != NULL)
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strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", tm);
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else
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g_strlcpy(timestr, "196912312359", sizeof(timestr)); /* second before the Epoch */
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sep[0] = G_DIR_SEPARATOR;
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tmp_file = g_strconcat(tmp_dir, sep, safe_pfx, "_", timestr, "_", TMP_FILE_SUFFIX, sfx, NULL);
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g_free(safe_pfx);
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if (strlen(tmp_file) > tf[idx].len) {
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tf[idx].len = 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 "mkstemps()"
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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 = ws_umask(0077);
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fd = mkstemps(tf[idx].path, sfx ? (int) strlen(sfx) : 0);
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ws_umask(old_umask);
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return fd;
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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