[gssapi-openssh.git] / openssh / 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 1.13 1998/06/30 23:03:13 deraadt 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 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
3c0ef626	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
	37	#include "includes.h"
	38
	39	#ifndef HAVE_MKDTEMP
	40
	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	#ifdef HAVE_CYGWIN
	46	#define open binary_open
	47	extern int binary_open();
	48	#endif
	49
	50	static int _gettemp(char , int , int, int);
	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;
87	int pid, rval;
88
89	if (doopen && domkdir) {
90	errno = EINVAL;
91	return(0);
92	}
93
94	for (trv = path; *trv; ++trv)
95	;
96	trv -= slen;
97	suffp = trv;
98	--trv;
99	if (trv < path) {
100	errno = EINVAL;
101	return (0);
102	}
103	pid = getpid();
104	while (*trv == 'X' && pid != 0) {
105	*trv-- = (pid % 10) + '0';
106	pid /= 10;
107	}
108	while (*trv == 'X') {
109	char c;
110
111	pid = (arc4random() & 0xffff) % (26+26);
112	if (pid < 26)
113	c = pid + 'A';
114	else
115	c = (pid - 26) + 'a';
116	*trv-- = c;
117	}
118	start = trv + 1;
119
120	/*
121	* check the target directory; if you have six X's and it
122	* doesn't exist this runs for a very long time.
123	*/
124	if (doopen \|\| domkdir) {
125	for (;; --trv) {
126	if (trv <= path)
127	break;
128	if (*trv == '/') {
129	*trv = '\0';
130	rval = stat(path, &sbuf);
131	*trv = '/';
132	if (rval != 0)
133	return(0);
134	if (!S_ISDIR(sbuf.st_mode)) {
135	errno = ENOTDIR;
136	return(0);
137	}
138	break;
139	}
140	}
141	}
142
143	for (;;) {
144	if (doopen) {
145	if ((*doopen =
146	open(path, O_CREAT\|O_EXCL\|O_RDWR, 0600)) >= 0)
147	return(1);
148	if (errno != EEXIST)
149	return(0);
150	} else if (domkdir) {
151	if (mkdir(path, 0700) == 0)
152	return(1);
153	if (errno != EEXIST)
154	return(0);
155	} else if (lstat(path, &sbuf))
156	return(errno == ENOENT ? 1 : 0);
157
158	/* tricky little algorithm for backward compatibility */
159	for (trv = start;;) {
160	if (!*trv)
161	return (0);
162	if (*trv == 'Z') {
163	if (trv == suffp)
164	return (0);
165	*trv++ = 'a';
166	} else {
167	if (isdigit(*trv))
168	*trv = 'a';
169	else if (trv == 'z') / inc from z to A */
170	*trv = 'A';
171	else {
172	if (trv == suffp)
173	return (0);
174	++*trv;
175	}
176	break;
177	}
178	}
179	}
180	/NOTREACHED/
181	}
182
183	#endif /* !HAVE_MKDTEMP */