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

/* OPENBSD ORIGINAL: lib/libc/stdio/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
12408a1b	1	/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */
12408a1b	2
3c0ef626	3	/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
	4	/* Changes: Removed mktemp */
	5
	6	/*
	7	* Copyright (c) 1987, 1993
	8	* The Regents of the University of California. All rights reserved.
	9	*
	10	* Redistribution and use in source and binary forms, with or without
	11	* modification, are permitted provided that the following conditions
	12	* are met:
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
0fff78ff	18	* 3. Neither the name of the University nor the names of its contributors
3c0ef626	19	* may be used to endorse or promote products derived from this software
	20	* without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	32	* SUCH DAMAGE.
	33	*/
	34
	35	#include "includes.h"
	36
6a9b3198	37	#if !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP)
3c0ef626	38
3c0ef626	39	#if defined(LIBC_SCCS) && !defined(lint)
0fff78ff	40	static char rcsid[] = "$OpenBSD: mktemp.c,v 1.17 2003/06/02 20:18:37 millert Exp $";
3c0ef626	41	#endif /* LIBC_SCCS and not lint */
	42
	43	#ifdef HAVE_CYGWIN
	44	#define open binary_open
	45	extern int binary_open();
	46	#endif
	47
	48	static int _gettemp(char , int , int, int);
	49
	50	int
	51	mkstemps(path, slen)
	52	char *path;
	53	int slen;
	54	{
	55	int fd;
	56
	57	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	58	}
	59
	60	int
	61	mkstemp(path)
	62	char *path;
	63	{
	64	int fd;
	65
	66	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	67	}
	68
	69	char *
	70	mkdtemp(path)
	71	char *path;
	72	{
	73	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	74	}
	75
	76	static int
	77	_gettemp(path, doopen, domkdir, slen)
	78	char *path;
	79	register int *doopen;
	80	int domkdir;
	81	int slen;
	82	{
	83	register char start, trv, *suffp;
	84	struct stat sbuf;
e9a17296	85	int rval;
e9a17296	86	pid_t pid;
3c0ef626	87
	88	if (doopen && domkdir) {
	89	errno = EINVAL;
	90	return(0);
	91	}
	92
	93	for (trv = path; *trv; ++trv)
	94	;
	95	trv -= slen;
	96	suffp = trv;
	97	--trv;
	98	if (trv < path) {
	99	errno = EINVAL;
	100	return (0);
	101	}
	102	pid = getpid();
41b2f314	103	while (trv >= path && *trv == 'X' && pid != 0) {
3c0ef626	104	*trv-- = (pid % 10) + '0';
	105	pid /= 10;
	106	}
41b2f314	107	while (trv >= path && *trv == 'X') {
3c0ef626	108	char c;
	109
	110	pid = (arc4random() & 0xffff) % (26+26);
	111	if (pid < 26)
	112	c = pid + 'A';
	113	else
	114	c = (pid - 26) + 'a';
	115	*trv-- = c;
	116	}
	117	start = trv + 1;
	118
	119	/*
	120	* check the target directory; if you have six X's and it
	121	* doesn't exist this runs for a very long time.
	122	*/
	123	if (doopen \|\| domkdir) {
	124	for (;; --trv) {
	125	if (trv <= path)
	126	break;
	127	if (*trv == '/') {
	128	*trv = '\0';
	129	rval = stat(path, &sbuf);
	130	*trv = '/';
	131	if (rval != 0)
	132	return(0);
	133	if (!S_ISDIR(sbuf.st_mode)) {
	134	errno = ENOTDIR;
	135	return(0);
	136	}
	137	break;
	138	}
	139	}
	140	}
	141
	142	for (;;) {
	143	if (doopen) {
	144	if ((*doopen =
	145	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
	146	return(1);
	147	if (errno != EEXIST)
	148	return(0);
	149	} else if (domkdir) {
	150	if (mkdir(path, 0700) == 0)
	151	return(1);
	152	if (errno != EEXIST)
	153	return(0);
	154	} else if (lstat(path, &sbuf))
	155	return(errno == ENOENT ? 1 : 0);
	156
	157	/* tricky little algorithm for backward compatibility */
	158	for (trv = start;;) {
	159	if (!*trv)
	160	return (0);
	161	if (*trv == 'Z') {
	162	if (trv == suffp)
	163	return (0);
	164	*trv++ = 'a';
	165	} else {
	166	if (isdigit(*trv))
	167	*trv = 'a';
	168	else if (trv == 'z') / inc from z to A */
	169	*trv = 'A';
	170	else {
	171	if (trv == suffp)
172	return (0);
173	++*trv;
174	}
175	break;
176	}
177	}
178	}
179	/NOTREACHED/
180	}
181
6a9b3198	182	#endif /* !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP) */