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https://github.com/troglobit/libite.git
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David Brownlee
f3f6947604
Linux systems pre Linux 3.11, and UNIX do not have the O_TMPFILE flag, so let's treat them the same, by wrapping tmpfile(). Signed-off-by: David Brownlee <abs@absd.org> Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* A secure tmpfile() replacement.
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*
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* Copyright (c) 2015 Joachim Nilsson <troglobit@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <paths.h>
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#include <fcntl.h> /* O_TMPFILE requires -D_GNU_SOURCE */
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#include <stdio.h> /* fdopen() */
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#include <sys/stat.h> /* umask() */
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/**
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* tempfile - A secure tmpfile() replacement
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*
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* This is the secure replacement for tmpfile() that does not exist in
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* GLIBC. The function uses the Linux specific %O_TMPFILE and %O_EXCL
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* for security. When the %FILE is fclose()'ed the file contents is
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* lost. The file is hidden in the %_PATH_TMP directory on the system.
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*
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* This function requires Linux 3.11, or later, due to %O_TMPFILE.
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*
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* Returns:
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* An open %FILE pointer, or %NULL on error.
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*/
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FILE *tempfile(void)
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{
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#ifdef O_TMPFILE /* Only on Linux, with fairly recent (G)LIBC */
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int fd;
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mode_t oldmask;
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oldmask = umask(0077);
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fd = open(_PATH_TMP, O_TMPFILE | O_RDWR | O_EXCL | O_CLOEXEC, S_IRUSR | S_IWUSR);
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umask(oldmask);
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if (-1 == fd)
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return NULL;
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return fdopen(fd, "rw");
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#else
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return tmpfile(); /* Fallback on older GLIBC/Linux and actual UNIX systems */
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#endif
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}
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#ifdef UNITTEST
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int main(void)
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{
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FILE *fp = tempfile(); system("ls -lrt "
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_PATH_TMP " | tail -10"); return fclose(fp);
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}
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#endif
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/**
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* Local Variables:
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* compile-command: "make V=1 -f tempfile.mk"
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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