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

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

/*	$OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $ */
/*
 * 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.
 */

/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */

#include "includes.h"

#include <sys/types.h>
#include <sys/stat.h>

#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>

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

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

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

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

int
mkstemp(char *path)
{
	int fd;

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

char *
mkdtemp(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
8efc0c15	1	/* THIS FILE HAS BEEN MODIFIED FROM THE ORIGINAL OPENBSD SOURCE */
	2	/* Changes: Removed mktemp */
	3
5bf337a5	4	/* $OpenBSD: mktemp.c,v 1.19 2005/08/08 08:05:36 espie Exp $ */
8efc0c15	5	/*
	6	* Copyright (c) 1987, 1993
	7	* The Regents of the University of California. All rights reserved.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
3e67f7df	17	* 3. Neither the name of the University nor the names of its contributors
8efc0c15	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
f6d4fb87	34	/* OPENBSD ORIGINAL: lib/libc/stdio/mktemp.c */
f6d4fb87	35
0b65b628	36	#include "includes.h"
beb43d31	37
b5b88c19	38	#include <sys/types.h>
b5b88c19	39	#include <sys/stat.h>
fec71b2f	40
22bbb3e6	41	#include <fcntl.h>
b5b88c19	42	#include <ctype.h>
fec71b2f	43	#include <errno.h>
28cb0a43	44	#include <unistd.h>
b5b88c19	45
70e7d0b0	46	#if !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP)
beb43d31	47
4cca272e	48	static int _gettemp(char , int , int, int);
8efc0c15	49
8efc0c15	50	int
5bf337a5	51	mkstemps(char *path, int slen)
8efc0c15	52	{
	53	int fd;
	54
	55	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	56	}
	57
	58	int
5bf337a5	59	mkstemp(char *path)
8efc0c15	60	{
	61	int fd;
	62
	63	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	64	}
	65
	66	char *
5bf337a5	67	mkdtemp(char *path)
8efc0c15	68	{
	69	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	70	}
	71
	72	static int
	73	_gettemp(path, doopen, domkdir, slen)
	74	char *path;
	75	register int *doopen;
	76	int domkdir;
	77	int slen;
	78	{
	79	register char start, trv, *suffp;
	80	struct stat sbuf;
1656cbed	81	int rval;
1656cbed	82	pid_t pid;
8efc0c15	83
	84	if (doopen && domkdir) {
	85	errno = EINVAL;
	86	return(0);
	87	}
	88
	89	for (trv = path; *trv; ++trv)
	90	;
	91	trv -= slen;
	92	suffp = trv;
	93	--trv;
	94	if (trv < path) {
	95	errno = EINVAL;
	96	return (0);
	97	}
	98	pid = getpid();
ac8802eb	99	while (trv >= path && *trv == 'X' && pid != 0) {
8efc0c15	100	*trv-- = (pid % 10) + '0';
	101	pid /= 10;
	102	}
ac8802eb	103	while (trv >= path && *trv == 'X') {
8efc0c15	104	char c;
	105
	106	pid = (arc4random() & 0xffff) % (26+26);
	107	if (pid < 26)
	108	c = pid + 'A';
	109	else
	110	c = (pid - 26) + 'a';
	111	*trv-- = c;
	112	}
	113	start = trv + 1;
	114
	115	/*
	116	* check the target directory; if you have six X's and it
	117	* doesn't exist this runs for a very long time.
	118	*/
	119	if (doopen \|\| domkdir) {
	120	for (;; --trv) {
	121	if (trv <= path)
	122	break;
	123	if (*trv == '/') {
	124	*trv = '\0';
	125	rval = stat(path, &sbuf);
	126	*trv = '/';
	127	if (rval != 0)
	128	return(0);
	129	if (!S_ISDIR(sbuf.st_mode)) {
	130	errno = ENOTDIR;
	131	return(0);
	132	}
	133	break;
	134	}
	135	}
	136	}
	137
	138	for (;;) {
	139	if (doopen) {
	140	if ((*doopen =
	141	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
	142	return(1);
	143	if (errno != EEXIST)
	144	return(0);
	145	} else if (domkdir) {
	146	if (mkdir(path, 0700) == 0)
	147	return(1);
	148	if (errno != EEXIST)
	149	return(0);
	150	} else if (lstat(path, &sbuf))
	151	return(errno == ENOENT ? 1 : 0);
	152
	153	/* tricky little algorithm for backward compatibility */
	154	for (trv = start;;) {
	155	if (!*trv)
	156	return (0);
	157	if (*trv == 'Z') {
	158	if (trv == suffp)
	159	return (0);
	160	*trv++ = 'a';
	161	} else {
	162	if (isdigit(*trv))
	163	*trv = 'a';
	164	else if (trv == 'z') / inc from z to A */
	165	*trv = 'A';
	166	else {
	167	if (trv == suffp)
168	return (0);
169	++*trv;
170	}
171	break;
172	}
173	}
174	}
175	/NOTREACHED/
176	}
fb723d82	177
70e7d0b0	178	#endif /* !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP) */