uclibc-ng/libc/misc/internals/tempname.c

/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>

/* Return nonzero if DIR is an existent directory.  */
static int direxists (const char *dir)
{
    struct stat buf;
    return stat(dir, &buf) == 0 && S_ISDIR (buf.st_mode);
}

/* Path search algorithm, for tmpnam, tmpfile, etc.  If DIR is
   non-null and exists, uses it; otherwise uses the first of $TMPDIR,
   P_tmpdir, /tmp that exists.  Copies into TMPL a template suitable
   for use with mk[s]temp.  Will fail (-1) if DIR is non-null and
   doesn't exist, none of the searched dirs exists, or there's not
   enough space in TMPL. */
int __path_search (char *tmpl, size_t tmpl_len, const char *dir, const char *pfx,
	       int try_tmpdir)
{
    //const char *d;
    size_t dlen, plen;

    if (!pfx || !pfx[0])
    {
	pfx = "file";
	plen = 4;
    }
    else
    {
	plen = strlen (pfx);
	if (plen > 5)
	    plen = 5;
    }

#if 0
    if (try_tmpdir)
    {
	d = __secure_getenv ("TMPDIR");
	if (d != NULL && direxists (d))
	    dir = d;
	else if (dir != NULL && direxists (dir))
	    /* nothing */ ;
	else
	    dir = NULL;
    }
#endif	
    if (dir == NULL)
    {
	if (direxists (P_tmpdir))
	    dir = P_tmpdir;
	else if (strcmp (P_tmpdir, "/tmp") != 0 && direxists ("/tmp"))
	    dir = "/tmp";
	else
	{
	    __set_errno (ENOENT);
	    return -1;
	}
    }

    dlen = strlen (dir);
    while (dlen > 1 && dir[dlen - 1] == '/')
	dlen--;			/* remove trailing slashes */

    /* check we have room for "${dir}/${pfx}XXXXXX\0" */
    if (tmpl_len < dlen + 1 + plen + 6 + 1)
    {
	__set_errno (EINVAL);
	return -1;
    }

    sprintf (tmpl, "%.*s/%.*sXXXXXX", (int) dlen, dir, (int) plen, pfx);
    return 0;
}

/* These are the characters used in temporary filenames.  */
static const char letters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

/* Generate a temporary file name based on TMPL.  TMPL must match the
   rules for mk[s]temp (i.e. end in "XXXXXX").  The name constructed
   does not exist at the time of the call to __gen_tempname.  TMPL is
   overwritten with the result.  If OPENIT is nonzero, creates the
   file and returns a read-write fd; the file is mode 0600 modulo
   umask.  If LARGEFILE is nonzero, uses open64() instead of open().

   We use a clever algorithm to get hard-to-predict names. */
int __gen_tempname (char *tmpl, int openit)
{
    int len;
    char *XXXXXX;
    static uint64_t value;
    struct timeval tv;
    int count, fd;
    int save_errno = errno;

    len = strlen (tmpl);
    if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
    {
	__set_errno (EINVAL);
	return -1;
    }

    /* This is where the Xs start.  */
    XXXXXX = &tmpl[len - 6];

    /* Get some more or less random data.  */
    gettimeofday (&tv, NULL);
    value += ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();

    for (count = 0; count < TMP_MAX; value += 7777, ++count)
    {
	uint64_t v = value;

	/* Fill in the random bits.  */
	XXXXXX[0] = letters[v % 62];
	v /= 62;
	XXXXXX[1] = letters[v % 62];
	v /= 62;
	XXXXXX[2] = letters[v % 62];
	v /= 62;
	XXXXXX[3] = letters[v % 62];
	v /= 62;
	XXXXXX[4] = letters[v % 62];
	v /= 62;
	XXXXXX[5] = letters[v % 62];

	if (openit)
	{
	    fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, 0600);
	    if (fd >= 0)
	    {
		__set_errno (save_errno);
		return fd;
	    }
	    else if (errno != EEXIST)
		/* Any other error will apply also to other names we might
		   try, and there are 2^32 or so of them, so give up now. */
		return -1;
	}
	else
	{
	    struct stat st;
	    if (stat (tmpl, &st) < 0)
	    {
		if (errno == ENOENT)
		{
		    __set_errno (save_errno);
		    return 0;
		}
		else
		    /* Give up now. */
		    return -1;
	    }
	}
    }

    /* We got out of the loop because we ran out of combinations to try.  */
    __set_errno (EEXIST);
    return -1;
}