[openssh.git] / bsd-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 "config.h"

#ifndef HAVE_MKDTEMP

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: mktemp.c,v 1.13 1998/06/30 23:03:13 deraadt Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <unistd.h>

#include "bsd-misc.h"
#include "bsd-arc4random.h"

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 pid, rval;

	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 == 'X' && pid != 0) {
		*trv-- = (pid % 10) + '0';
		pid /= 10;
	}
	while (*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
beb43d31	37	#include "config.h"
	38
	39	#ifndef HAVE_MKDTEMP
	40
8efc0c15	41	#if defined(LIBC_SCCS) && !defined(lint)
	42	static char rcsid[] = "$OpenBSD: mktemp.c,v 1.13 1998/06/30 23:03:13 deraadt Exp $";
	43	#endif /* LIBC_SCCS and not lint */
	44
	45	#include <sys/types.h>
	46	#include <sys/stat.h>
	47	#include <fcntl.h>
	48	#include <errno.h>
	49	#include <stdio.h>
	50	#include <stdlib.h>
	51	#include <ctype.h>
	52	#include <unistd.h>
	53
5ab44a92	54	#include "bsd-misc.h"
c345cf9d	55	#include "bsd-arc4random.h"
0183ea1c	56
4cca272e	57	static int _gettemp(char , int , int, int);
8efc0c15	58
	59	int
	60	mkstemps(path, slen)
	61	char *path;
	62	int slen;
	63	{
	64	int fd;
	65
	66	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	67	}
	68
	69	int
	70	mkstemp(path)
	71	char *path;
	72	{
	73	int fd;
	74
	75	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	76	}
	77
	78	char *
	79	mkdtemp(path)
	80	char *path;
	81	{
	82	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	83	}
	84
	85	static int
	86	_gettemp(path, doopen, domkdir, slen)
	87	char *path;
	88	register int *doopen;
	89	int domkdir;
	90	int slen;
	91	{
	92	register char start, trv, *suffp;
	93	struct stat sbuf;
	94	int pid, rval;
	95
	96	if (doopen && domkdir) {
	97	errno = EINVAL;
	98	return(0);
	99	}
	100
	101	for (trv = path; *trv; ++trv)
	102	;
	103	trv -= slen;
	104	suffp = trv;
	105	--trv;
	106	if (trv < path) {
	107	errno = EINVAL;
	108	return (0);
	109	}
	110	pid = getpid();
	111	while (*trv == 'X' && pid != 0) {
	112	*trv-- = (pid % 10) + '0';
	113	pid /= 10;
	114	}
	115	while (*trv == 'X') {
	116	char c;
	117
	118	pid = (arc4random() & 0xffff) % (26+26);
	119	if (pid < 26)
	120	c = pid + 'A';
	121	else
122	c = (pid - 26) + 'a';
123	*trv-- = c;
124	}
125	start = trv + 1;
126
127	/*
128	* check the target directory; if you have six X's and it
129	* doesn't exist this runs for a very long time.
130	*/
131	if (doopen \|\| domkdir) {
132	for (;; --trv) {
133	if (trv <= path)
134	break;
135	if (*trv == '/') {
136	*trv = '\0';
137	rval = stat(path, &sbuf);
138	*trv = '/';
139	if (rval != 0)
140	return(0);
141	if (!S_ISDIR(sbuf.st_mode)) {
142	errno = ENOTDIR;
143	return(0);
144	}
145	break;
146	}
147	}
148	}
149
150	for (;;) {
151	if (doopen) {
152	if ((*doopen =
153	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
154	return(1);
155	if (errno != EEXIST)
156	return(0);
157	} else if (domkdir) {
158	if (mkdir(path, 0700) == 0)
159	return(1);
160	if (errno != EEXIST)
161	return(0);
162	} else if (lstat(path, &sbuf))
163	return(errno == ENOENT ? 1 : 0);
164
165	/* tricky little algorithm for backward compatibility */
166	for (trv = start;;) {
167	if (!*trv)
168	return (0);
169	if (*trv == 'Z') {
170	if (trv == suffp)
171	return (0);
172	*trv++ = 'a';
173	} else {
174	if (isdigit(*trv))
175	*trv = 'a';
176	else if (trv == 'z') / inc from z to A */
177	*trv = 'A';
178	else {
179	if (trv == suffp)
180	return (0);
181	++*trv;
182	}
183	break;
184	}
185	}
186	}
187	/NOTREACHED/
188	}
fb723d82	189
fb723d82	190	#endif /* !HAVE_MKDTEMP */