[gssapi-openssh.git] / openssh / openbsd-compat / mktemp.c

/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
/* Changes: Removed mktemp */

/*
 * Copyright (c) 1987, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "includes.h"

#if !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP)

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: mktemp.c,v 1.17 2003/06/02 20:18:37 millert Exp $";
#endif /* LIBC_SCCS and not lint */

#ifdef HAVE_CYGWIN
#define open binary_open
extern int binary_open();
#endif

static int _gettemp(char *, int *, int, int);

int
mkstemps(path, slen)
	char *path;
	int slen;
{
	int fd;

	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}

int
mkstemp(path)
	char *path;
{
	int fd;

	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
}

char *
mkdtemp(path)
	char *path;
{
	return(_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
}

static int
_gettemp(path, doopen, domkdir, slen)
	char *path;
	register int *doopen;
	int domkdir;
	int slen;
{
	register char *start, *trv, *suffp;
	struct stat sbuf;
	int rval;
	pid_t pid;

	if (doopen && domkdir) {
		errno = EINVAL;
		return(0);
	}

	for (trv = path; *trv; ++trv)
		;
	trv -= slen;
	suffp = trv;
	--trv;
	if (trv < path) {
		errno = EINVAL;
		return (0);
	}
	pid = getpid();
	while (trv >= path && *trv == 'X' && pid != 0) {
		*trv-- = (pid % 10) + '0';
		pid /= 10;
	}
	while (trv >= path && *trv == 'X') {
		char c;

		pid = (arc4random() & 0xffff) % (26+26);
		if (pid < 26)
			c = pid + 'A';
		else
			c = (pid - 26) + 'a';
		*trv-- = c;
	}
	start = trv + 1;

	/*
	 * check the target directory; if you have six X's and it
	 * doesn't exist this runs for a *very* long time.
	 */
	if (doopen || domkdir) {
		for (;; --trv) {
			if (trv <= path)
				break;
			if (*trv == '/') {
				*trv = '\0';
				rval = stat(path, &sbuf);
				*trv = '/';
				if (rval != 0)
					return(0);
				if (!S_ISDIR(sbuf.st_mode)) {
					errno = ENOTDIR;
					return(0);
				}
				break;
			}
		}
	}

	for (;;) {
		if (doopen) {
			if ((*doopen =
			    open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
				return(1);
			if (errno != EEXIST)
				return(0);
		} else if (domkdir) {
			if (mkdir(path, 0700) == 0)
				return(1);
			if (errno != EEXIST)
				return(0);
		} else if (lstat(path, &sbuf))
			return(errno == ENOENT ? 1 : 0);

		/* tricky little algorithm for backward compatibility */
		for (trv = start;;) {
			if (!*trv)
				return (0);
			if (*trv == 'Z') {
				if (trv == suffp)
					return (0);
				*trv++ = 'a';
			} else {
				if (isdigit(*trv))
					*trv = 'a';
				else if (*trv == 'z')	/* inc from z to A */
					*trv = 'A';
				else {
					if (trv == suffp)
						return (0);
					++*trv;
				}
				break;
			}
		}
	}
	/*NOTREACHED*/
}

#endif /* !defined(HAVE_MKDTEMP) || defined(HAVE_STRICT_MKSTEMP) */
Commit	Line	Data
3c0ef626	1	/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
	2	/* Changes: Removed mktemp */
	3
	4	/*
	5	* Copyright (c) 1987, 1993
	6	* The Regents of the University of California. All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
0fff78ff	16	* 3. Neither the name of the University nor the names of its contributors
3c0ef626	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
	33	#include "includes.h"
	34
6a9b3198	35	#if !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP)
3c0ef626	36
3c0ef626	37	#if defined(LIBC_SCCS) && !defined(lint)
0fff78ff	38	static char rcsid[] = "$OpenBSD: mktemp.c,v 1.17 2003/06/02 20:18:37 millert Exp $";
3c0ef626	39	#endif /* LIBC_SCCS and not lint */
	40
	41	#ifdef HAVE_CYGWIN
	42	#define open binary_open
	43	extern int binary_open();
	44	#endif
	45
	46	static int _gettemp(char , int , int, int);
	47
	48	int
	49	mkstemps(path, slen)
	50	char *path;
	51	int slen;
	52	{
	53	int fd;
	54
	55	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	56	}
	57
	58	int
	59	mkstemp(path)
	60	char *path;
	61	{
	62	int fd;
	63
	64	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	65	}
	66
	67	char *
	68	mkdtemp(path)
	69	char *path;
	70	{
	71	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	72	}
	73
	74	static int
	75	_gettemp(path, doopen, domkdir, slen)
	76	char *path;
	77	register int *doopen;
	78	int domkdir;
	79	int slen;
	80	{
	81	register char start, trv, *suffp;
	82	struct stat sbuf;
e9a17296	83	int rval;
e9a17296	84	pid_t pid;
3c0ef626	85
	86	if (doopen && domkdir) {
	87	errno = EINVAL;
	88	return(0);
	89	}
	90
	91	for (trv = path; *trv; ++trv)
	92	;
	93	trv -= slen;
	94	suffp = trv;
	95	--trv;
	96	if (trv < path) {
	97	errno = EINVAL;
	98	return (0);
	99	}
	100	pid = getpid();
41b2f314	101	while (trv >= path && *trv == 'X' && pid != 0) {
3c0ef626	102	*trv-- = (pid % 10) + '0';
	103	pid /= 10;
	104	}
41b2f314	105	while (trv >= path && *trv == 'X') {
3c0ef626	106	char c;
	107
	108	pid = (arc4random() & 0xffff) % (26+26);
	109	if (pid < 26)
	110	c = pid + 'A';
	111	else
	112	c = (pid - 26) + 'a';
	113	*trv-- = c;
	114	}
	115	start = trv + 1;
	116
	117	/*
	118	* check the target directory; if you have six X's and it
	119	* doesn't exist this runs for a very long time.
	120	*/
	121	if (doopen \|\| domkdir) {
	122	for (;; --trv) {
	123	if (trv <= path)
	124	break;
	125	if (*trv == '/') {
	126	*trv = '\0';
	127	rval = stat(path, &sbuf);
	128	*trv = '/';
	129	if (rval != 0)
	130	return(0);
	131	if (!S_ISDIR(sbuf.st_mode)) {
	132	errno = ENOTDIR;
	133	return(0);
	134	}
	135	break;
	136	}
	137	}
	138	}
	139
	140	for (;;) {
	141	if (doopen) {
	142	if ((*doopen =
	143	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
	144	return(1);
	145	if (errno != EEXIST)
	146	return(0);
	147	} else if (domkdir) {
	148	if (mkdir(path, 0700) == 0)
	149	return(1);
	150	if (errno != EEXIST)
	151	return(0);
	152	} else if (lstat(path, &sbuf))
	153	return(errno == ENOENT ? 1 : 0);
	154
	155	/* tricky little algorithm for backward compatibility */
	156	for (trv = start;;) {
	157	if (!*trv)
	158	return (0);
	159	if (*trv == 'Z') {
	160	if (trv == suffp)
	161	return (0);
	162	*trv++ = 'a';
	163	} else {
	164	if (isdigit(*trv))
	165	*trv = 'a';
	166	else if (trv == 'z') / inc from z to A */
	167	*trv = 'A';
	168	else {
	169	if (trv == suffp)
170	return (0);
171	++*trv;
172	}
173	break;
174	}
175	}
176	}
177	/NOTREACHED/
178	}
179
6a9b3198	180	#endif /* !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP) */