[openssh.git] / 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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"

#ifndef HAVE_MKDTEMP

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: mktemp.c,v 1.16 2002/05/27 18:20:45 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 /* !HAVE_MKDTEMP */
Commit	Line	Data
8efc0c15	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.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*/
	36
0b65b628	37	#include "includes.h"
beb43d31	38
	39	#ifndef HAVE_MKDTEMP
	40
8efc0c15	41	#if defined(LIBC_SCCS) && !defined(lint)
ac8802eb	42	static char rcsid[] = "$OpenBSD: mktemp.c,v 1.16 2002/05/27 18:20:45 millert Exp $";
8efc0c15	43	#endif /* LIBC_SCCS and not lint */
8efc0c15	44
3c62e7eb	45	#ifdef HAVE_CYGWIN
	46	#define open binary_open
	47	extern int binary_open();
	48	#endif
	49
4cca272e	50	static int _gettemp(char , int , int, int);
8efc0c15	51
	52	int
	53	mkstemps(path, slen)
	54	char *path;
	55	int slen;
	56	{
	57	int fd;
	58
	59	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	60	}
	61
	62	int
	63	mkstemp(path)
	64	char *path;
	65	{
	66	int fd;
	67
	68	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	69	}
	70
	71	char *
	72	mkdtemp(path)
	73	char *path;
	74	{
	75	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	76	}
	77
	78	static int
	79	_gettemp(path, doopen, domkdir, slen)
	80	char *path;
	81	register int *doopen;
	82	int domkdir;
	83	int slen;
	84	{
	85	register char start, trv, *suffp;
	86	struct stat sbuf;
1656cbed	87	int rval;
1656cbed	88	pid_t pid;
8efc0c15	89
	90	if (doopen && domkdir) {
	91	errno = EINVAL;
	92	return(0);
	93	}
	94
	95	for (trv = path; *trv; ++trv)
	96	;
	97	trv -= slen;
	98	suffp = trv;
	99	--trv;
	100	if (trv < path) {
	101	errno = EINVAL;
	102	return (0);
	103	}
	104	pid = getpid();
ac8802eb	105	while (trv >= path && *trv == 'X' && pid != 0) {
8efc0c15	106	*trv-- = (pid % 10) + '0';
	107	pid /= 10;
	108	}
ac8802eb	109	while (trv >= path && *trv == 'X') {
8efc0c15	110	char c;
	111
	112	pid = (arc4random() & 0xffff) % (26+26);
	113	if (pid < 26)
	114	c = pid + 'A';
	115	else
	116	c = (pid - 26) + 'a';
	117	*trv-- = c;
	118	}
	119	start = trv + 1;
	120
	121	/*
	122	* check the target directory; if you have six X's and it
	123	* doesn't exist this runs for a very long time.
	124	*/
	125	if (doopen \|\| domkdir) {
	126	for (;; --trv) {
	127	if (trv <= path)
	128	break;
	129	if (*trv == '/') {
	130	*trv = '\0';
	131	rval = stat(path, &sbuf);
	132	*trv = '/';
	133	if (rval != 0)
	134	return(0);
	135	if (!S_ISDIR(sbuf.st_mode)) {
	136	errno = ENOTDIR;
	137	return(0);
	138	}
	139	break;
	140	}
	141	}
	142	}
	143
	144	for (;;) {
	145	if (doopen) {
	146	if ((*doopen =
	147	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
	148	return(1);
	149	if (errno != EEXIST)
	150	return(0);
	151	} else if (domkdir) {
	152	if (mkdir(path, 0700) == 0)
	153	return(1);
	154	if (errno != EEXIST)
	155	return(0);
	156	} else if (lstat(path, &sbuf))
	157	return(errno == ENOENT ? 1 : 0);
	158
	159	/* tricky little algorithm for backward compatibility */
	160	for (trv = start;;) {
	161	if (!*trv)
	162	return (0);
	163	if (*trv == 'Z') {
	164	if (trv == suffp)
	165	return (0);
	166	*trv++ = 'a';
	167	} else {
	168	if (isdigit(*trv))
	169	*trv = 'a';
	170	else if (trv == 'z') / inc from z to A */
	171	*trv = 'A';
	172	else {
	173	if (trv == suffp)
174	return (0);
175	++*trv;
176	}
177	break;
178	}
179	}
180	}
181	/NOTREACHED/
182	}
fb723d82	183
fb723d82	184	#endif /* !HAVE_MKDTEMP */