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/*
* Temp file utilities for CUPS.
*
* Copyright © 2007-2018 by Apple Inc.
* Copyright © 1997-2006 by Easy Software Products.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers...
*/
#include "cups-private.h"
#include "debug-internal.h"
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#if defined(_WIN32) || defined(__EMX__)
# include <io.h>
#else
# include <unistd.h>
#endif /* _WIN32 || __EMX__ */
/*
* 'cupsTempFd()' - Creates a temporary file.
*
* The temporary filename is returned in the filename buffer.
* The temporary file is opened for reading and writing.
*/
int /* O - New file descriptor or -1 on error */
cupsTempFd(char *filename, /* I - Pointer to buffer */
int len) /* I - Size of buffer */
{
int fd; /* File descriptor for temp file */
int tries; /* Number of tries */
const char *tmpdir; /* TMPDIR environment var */
#if defined(__APPLE__) || defined(_WIN32)
char tmppath[1024]; /* Temporary directory */
#endif /* __APPLE__ || _WIN32 */
#ifdef _WIN32
DWORD curtime; /* Current time */
#else
struct timeval curtime; /* Current time */
#endif /* _WIN32 */
/*
* See if TMPDIR is defined...
*/
#ifdef _WIN32
if ((tmpdir = getenv("TEMP")) == NULL)
{
GetTempPathA(sizeof(tmppath), tmppath);
tmpdir = tmppath;
}
#elif defined(__APPLE__)
/*
* On macOS and iOS, the TMPDIR environment variable is not always the best
* location to place temporary files due to sandboxing. Instead, the confstr
* function should be called to get the proper per-user, per-process TMPDIR
* value.
*/
if ((tmpdir = getenv("TMPDIR")) != NULL && access(tmpdir, W_OK))
tmpdir = NULL;
if (!tmpdir)
{
if (confstr(_CS_DARWIN_USER_TEMP_DIR, tmppath, sizeof(tmppath)))
tmpdir = tmppath;
else
tmpdir = "/private/tmp"; /* This should never happen */
}
#else
/*
* Previously we put root temporary files in the default CUPS temporary
* directory under /var/spool/cups. However, since the scheduler cleans
* out temporary files there and runs independently of the user apps, we
* don't want to use it unless specifically told to by cupsd.
*/
if ((tmpdir = getenv("TMPDIR")) == NULL)
tmpdir = "/tmp";
#endif /* _WIN32 */
/*
* Make the temporary name using the specified directory...
*/
tries = 0;
do
{
#ifdef _WIN32
/*
* Get the current time of day...
*/
curtime = GetTickCount() + tries;
/*
* Format a string using the hex time values...
*/
snprintf(filename, (size_t)len - 1, "%s/%05lx%08lx", tmpdir, GetCurrentProcessId(), curtime);
#else
/*
* Get the current time of day...
*/
gettimeofday(&curtime, NULL);
/*
* Format a string using the hex time values...
*/
snprintf(filename, (size_t)len - 1, "%s/%05x%08x", tmpdir, (unsigned)getpid(), (unsigned)(curtime.tv_sec + curtime.tv_usec + tries));
#endif /* _WIN32 */
/*
* Open the file in "exclusive" mode, making sure that we don't
* stomp on an existing file or someone's symlink crack...
*/
#ifdef _WIN32
fd = open(filename, _O_CREAT | _O_RDWR | _O_TRUNC | _O_BINARY,
_S_IREAD | _S_IWRITE);
#elif defined(O_NOFOLLOW)
fd = open(filename, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, 0600);
#else
fd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
#endif /* _WIN32 */
if (fd < 0 && errno != EEXIST)
break;
tries ++;
}
while (fd < 0 && tries < 1000);
/*
* Return the file descriptor...
*/
return (fd);
}
/*
* 'cupsTempFile()' - Generates a temporary filename.
*
* The temporary filename is returned in the filename buffer.
* This function is deprecated and will no longer generate a temporary
* filename - use @link cupsTempFd@ or @link cupsTempFile2@ instead.
*
* @deprecated@
*/
char * /* O - Filename or @code NULL@ on error */
cupsTempFile(char *filename, /* I - Pointer to buffer */
int len) /* I - Size of buffer */
{
(void)len;
if (filename)
*filename = '\0';
return (NULL);
}
/*
* 'cupsTempFile2()' - Creates a temporary CUPS file.
*
* The temporary filename is returned in the filename buffer.
* The temporary file is opened for writing.
*
* @since CUPS 1.2/macOS 10.5@
*/
cups_file_t * /* O - CUPS file or @code NULL@ on error */
cupsTempFile2(char *filename, /* I - Pointer to buffer */
int len) /* I - Size of buffer */
{
cups_file_t *file; /* CUPS file */
int fd; /* File descriptor */
if ((fd = cupsTempFd(filename, len)) < 0)
return (NULL);
else if ((file = cupsFileOpenFd(fd, "w")) == NULL)
{
close(fd);
unlink(filename);
return (NULL);
}
else
return (file);
}
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