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