[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"

#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
70e7d0b0	38	#if !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP)
beb43d31	39
4cca272e	40	static int _gettemp(char , int , int, int);
8efc0c15	41
8efc0c15	42	int
5bf337a5	43	mkstemps(char *path, int slen)
8efc0c15	44	{
	45	int fd;
	46
	47	return (_gettemp(path, &fd, 0, slen) ? fd : -1);
	48	}
	49
	50	int
5bf337a5	51	mkstemp(char *path)
8efc0c15	52	{
	53	int fd;
	54
	55	return (_gettemp(path, &fd, 0, 0) ? fd : -1);
	56	}
	57
	58	char *
5bf337a5	59	mkdtemp(char *path)
8efc0c15	60	{
	61	return(_gettemp(path, (int )NULL, 1, 0) ? path : (char )NULL);
	62	}
	63
	64	static int
	65	_gettemp(path, doopen, domkdir, slen)
	66	char *path;
	67	register int *doopen;
	68	int domkdir;
	69	int slen;
	70	{
	71	register char start, trv, *suffp;
	72	struct stat sbuf;
1656cbed	73	int rval;
1656cbed	74	pid_t pid;
8efc0c15	75
	76	if (doopen && domkdir) {
	77	errno = EINVAL;
	78	return(0);
	79	}
	80
	81	for (trv = path; *trv; ++trv)
	82	;
	83	trv -= slen;
	84	suffp = trv;
	85	--trv;
	86	if (trv < path) {
	87	errno = EINVAL;
	88	return (0);
	89	}
	90	pid = getpid();
ac8802eb	91	while (trv >= path && *trv == 'X' && pid != 0) {
8efc0c15	92	*trv-- = (pid % 10) + '0';
	93	pid /= 10;
	94	}
ac8802eb	95	while (trv >= path && *trv == 'X') {
8efc0c15	96	char c;
	97
	98	pid = (arc4random() & 0xffff) % (26+26);
	99	if (pid < 26)
	100	c = pid + 'A';
	101	else
	102	c = (pid - 26) + 'a';
	103	*trv-- = c;
	104	}
	105	start = trv + 1;
	106
	107	/*
	108	* check the target directory; if you have six X's and it
	109	* doesn't exist this runs for a very long time.
	110	*/
	111	if (doopen \|\| domkdir) {
	112	for (;; --trv) {
	113	if (trv <= path)
	114	break;
	115	if (*trv == '/') {
	116	*trv = '\0';
	117	rval = stat(path, &sbuf);
	118	*trv = '/';
	119	if (rval != 0)
	120	return(0);
	121	if (!S_ISDIR(sbuf.st_mode)) {
	122	errno = ENOTDIR;
	123	return(0);
	124	}
	125	break;
	126	}
	127	}
	128	}
	129
	130	for (;;) {
	131	if (doopen) {
	132	if ((*doopen =
	133	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
	134	return(1);
	135	if (errno != EEXIST)
	136	return(0);
	137	} else if (domkdir) {
	138	if (mkdir(path, 0700) == 0)
	139	return(1);
	140	if (errno != EEXIST)
	141	return(0);
	142	} else if (lstat(path, &sbuf))
	143	return(errno == ENOENT ? 1 : 0);
	144
	145	/* tricky little algorithm for backward compatibility */
	146	for (trv = start;;) {
	147	if (!*trv)
	148	return (0);
	149	if (*trv == 'Z') {
	150	if (trv == suffp)
	151	return (0);
	152	*trv++ = 'a';
	153	} else {
	154	if (isdigit(*trv))
	155	*trv = 'a';
	156	else if (trv == 'z') / inc from z to A */
	157	*trv = 'A';
	158	else {
	159	if (trv == suffp)
160	return (0);
161	++*trv;
162	}
163	break;
164	}
165	}
166	}
167	/NOTREACHED/
168	}
fb723d82	169
70e7d0b0	170	#endif /* !defined(HAVE_MKDTEMP) \|\| defined(HAVE_STRICT_MKSTEMP) */