IABSD.fr/src/lib/libc/stdlib/mktemp.c

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• Author : millert
  Date : 2024-01-19 19:45:02
  Hash : 2ce65aae
  Message : Make our mktemp(3) callback-driven and split into multiple files. Previously, calling any of the mktemp(3) family would pull in lstat(2), open(2) and mkdir(2). Now, only the necessary system calls will be reachable from the binary. OK deraadt@ guenther@

• lib/libc/stdlib/mktemp.c

• /*	$OpenBSD: mktemp.c,v 1.2 2024/01/19 19:45:02 millert Exp $ */
  /*
   * Copyright (c) 2024 Todd C. Miller
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/stat.h>
  #include <errno.h>
  #include <stdlib.h>
  
  static int
  mktemp_cb(const char *path, int flags)
  {
  	struct stat sb;
  
  	if (lstat(path, &sb) == 0)
  		errno = EEXIST;
  	return (errno == ENOENT ? 0 : -1);
  }
  
  /* Also called via tmpnam(3) and tempnam(3). */
  char *
  _mktemp(char *path)
  {
  	if (__mktemp4(path, 0, 0, mktemp_cb) == 0)
  		return path;
  	return NULL;
  }
  
  __warn_references(mktemp,
      "mktemp() possibly used unsafely; consider using mkstemp()");
  
  char *
  mktemp(char *path)
  {
  	return _mktemp(path);
  }