[apple/libc.git] / gen / FreeBSD / exec.c

/*-
 * Copyright (c) 1991, 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.
 * 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)exec.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/exec.c,v 1.27 2009/12/05 18:55:16 ed Exp $");

#include "namespace.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <paths.h>

#include <stdarg.h>
#include "un-namespace.h"
#include "libc_private.h"

extern char **environ;

int
execl(const char *name, const char *arg, ...)
{
	va_list ap;
	const char **argv;
	int n;

	va_start(ap, arg);
	n = 1;
	while (va_arg(ap, char *) != NULL)
		n++;
	va_end(ap);
	argv = alloca((n + 1) * sizeof(*argv));
	if (argv == NULL) {
		errno = ENOMEM;
		return (-1);
	}
	va_start(ap, arg);
	n = 1;
	argv[0] = arg;
	while ((argv[n] = va_arg(ap, char *)) != NULL)
		n++;
	va_end(ap);
	return (_execve(name, __DECONST(char **, argv), environ));
}

int
execle(const char *name, const char *arg, ...)
{
	va_list ap;
	const char **argv;
	char **envp;
	int n;

	va_start(ap, arg);
	n = 1;
	while (va_arg(ap, char *) != NULL)
		n++;
	va_end(ap);
	argv = alloca((n + 1) * sizeof(*argv));
	if (argv == NULL) {
		errno = ENOMEM;
		return (-1);
	}
	va_start(ap, arg);
	n = 1;
	argv[0] = arg;
	while ((argv[n] = va_arg(ap, char *)) != NULL)
		n++;
	envp = va_arg(ap, char **);
	va_end(ap);
	return (_execve(name, __DECONST(char **, argv), envp));
}

int
execlp(const char *name, const char *arg, ...)
{
	va_list ap;
	const char **argv;
	int n;

	va_start(ap, arg);
	n = 1;
	while (va_arg(ap, char *) != NULL)
		n++;
	va_end(ap);
	argv = alloca((n + 1) * sizeof(*argv));
	if (argv == NULL) {
		errno = ENOMEM;
		return (-1);
	}
	va_start(ap, arg);
	n = 1;
	argv[0] = arg;
	while ((argv[n] = va_arg(ap, char *)) != NULL)
		n++;
	va_end(ap);
	return (execvp(name, __DECONST(char **, argv)));
}

int
execv(name, argv)
	const char *name;
	char * const *argv;
{
	(void)_execve(name, argv, environ);
	return (-1);
}

int
execvp(const char *name, char * const *argv)
{
	return (_execvpe(name, argv, environ));
}

static int
execvPe(const char *name, const char *path, char * const *argv,
    char * const *envp)
{
	const char **memp;
	size_t cnt, lp, ln;
	int eacces, save_errno;
	char *cur, buf[MAXPATHLEN];
	const char *p, *bp;
	struct stat sb;

	eacces = 0;

	/* If it's an absolute or relative path name, it's easy. */
	if (index(name, '/')) {
		bp = name;
		cur = NULL;
		goto retry;
	}
	bp = buf;

	/* If it's an empty path name, fail in the usual POSIX way. */
	if (*name == '\0') {
		errno = ENOENT;
		return (-1);
	}

	cur = alloca(strlen(path) + 1);
	if (cur == NULL) {
		errno = ENOMEM;
		return (-1);
	}
	strcpy(cur, path);
	while ((p = strsep(&cur, ":")) != NULL) {
		/*
		 * It's a SHELL path -- double, leading and trailing colons
		 * mean the current directory.
		 */
		if (*p == '\0') {
			p = ".";
			lp = 1;
		} else
			lp = strlen(p);
		ln = strlen(name);

		/*
		 * If the path is too long complain.  This is a possible
		 * security issue; given a way to make the path too long
		 * the user may execute the wrong program.
		 */
		if (lp + ln + 2 > sizeof(buf)) {
			(void)_write(STDERR_FILENO, "execvP: ", 8);
			(void)_write(STDERR_FILENO, p, lp);
			(void)_write(STDERR_FILENO, ": path too long\n",
			    16);
			continue;
		}
		bcopy(p, buf, lp);
		buf[lp] = '/';
		bcopy(name, buf + lp + 1, ln);
		buf[lp + ln + 1] = '\0';

retry:		(void)_execve(bp, argv, envp);
		switch (errno) {
		case E2BIG:
			goto done;
		case ELOOP:
		case ENAMETOOLONG:
		case ENOENT:
			break;
		case ENOEXEC:
			for (cnt = 0; argv[cnt]; ++cnt)
				;
			memp = alloca((cnt + 2) * sizeof(char *));
			if (memp == NULL) {
				/* errno = ENOMEM; XXX override ENOEXEC? */
				goto done;
			}
			memp[0] = "sh";
			memp[1] = bp;
			bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
 			(void)_execve(_PATH_BSHELL,
			    __DECONST(char **, memp), envp);
			goto done;
		case ENOMEM:
			goto done;
		case ENOTDIR:
			break;
		case ETXTBSY:
			/*
			 * We used to retry here, but sh(1) doesn't.
			 */
			goto done;
		default:
			/*
			 * EACCES may be for an inaccessible directory or
			 * a non-executable file.  Call stat() to decide
			 * which.  This also handles ambiguities for EFAULT
			 * and EIO, and undocumented errors like ESTALE.
			 * We hope that the race for a stat() is unimportant.
			 */
			save_errno = errno;
			if (stat(bp, &sb) != 0)
				break;
			if (save_errno == EACCES) {
				eacces = 1;
				continue;
			}
			errno = save_errno;
			goto done;
		}
	}
	if (eacces)
		errno = EACCES;
	else
		errno = ENOENT;
done:
	return (-1);
}

int
execvP(const char *name, const char *path, char * const argv[])
{
	return execvPe(name, path, argv, environ);
}

int
_execvpe(const char *name, char * const argv[], char * const envp[])
{
	const char *path;

	/* Get the path we're searching. */
	if ((path = getenv("PATH")) == NULL)
		path = _PATH_DEFPATH;

	return (execvPe(name, path, argv, envp));
}
Commit	Line	Data
9385eb3d A	1	/*-
	2	* Copyright (c) 1991, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
9385eb3d A	13	* 4. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29
	30	#if defined(LIBC_SCCS) && !defined(lint)
	31	static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
	32	#endif /* LIBC_SCCS and not lint */
	33	#include <sys/cdefs.h>
1f2f436a	34	__FBSDID("$FreeBSD: src/lib/libc/gen/exec.c,v 1.27 2009/12/05 18:55:16 ed Exp $");
9385eb3d A	35
	36	#include "namespace.h"
	37	#include <sys/param.h>
	38	#include <sys/types.h>
	39	#include <sys/stat.h>
	40	#include <errno.h>
	41	#include <unistd.h>
	42	#include <stdlib.h>
	43	#include <string.h>
	44	#include <stdio.h>
	45	#include <paths.h>
	46
	47	#include <stdarg.h>
	48	#include "un-namespace.h"
1f2f436a	49	#include "libc_private.h"
9385eb3d A	50
	51	extern char **environ;
	52
	53	int
	54	execl(const char name, const char arg, ...)
	55	{
	56	va_list ap;
1f2f436a	57	const char **argv;
9385eb3d A	58	int n;
	59
	60	va_start(ap, arg);
	61	n = 1;
	62	while (va_arg(ap, char *) != NULL)
	63	n++;
	64	va_end(ap);
	65	argv = alloca((n + 1) * sizeof(*argv));
	66	if (argv == NULL) {
	67	errno = ENOMEM;
	68	return (-1);
	69	}
	70	va_start(ap, arg);
	71	n = 1;
1f2f436a	72	argv[0] = arg;
9385eb3d A	73	while ((argv[n] = va_arg(ap, char *)) != NULL)
	74	n++;
	75	va_end(ap);
1f2f436a	76	return (_execve(name, __DECONST(char **, argv), environ));
9385eb3d A	77	}
	78
	79	int
	80	execle(const char name, const char arg, ...)
	81	{
	82	va_list ap;
1f2f436a A	83	const char **argv;
1f2f436a A	84	char **envp;
9385eb3d A	85	int n;
	86
	87	va_start(ap, arg);
	88	n = 1;
	89	while (va_arg(ap, char *) != NULL)
	90	n++;
	91	va_end(ap);
	92	argv = alloca((n + 1) * sizeof(*argv));
	93	if (argv == NULL) {
	94	errno = ENOMEM;
	95	return (-1);
	96	}
	97	va_start(ap, arg);
	98	n = 1;
1f2f436a	99	argv[0] = arg;
9385eb3d A	100	while ((argv[n] = va_arg(ap, char *)) != NULL)
	101	n++;
	102	envp = va_arg(ap, char **);
	103	va_end(ap);
1f2f436a	104	return (_execve(name, __DECONST(char **, argv), envp));
9385eb3d A	105	}
	106
	107	int
	108	execlp(const char name, const char arg, ...)
	109	{
	110	va_list ap;
1f2f436a	111	const char **argv;
9385eb3d A	112	int n;
	113
	114	va_start(ap, arg);
	115	n = 1;
	116	while (va_arg(ap, char *) != NULL)
	117	n++;
	118	va_end(ap);
	119	argv = alloca((n + 1) * sizeof(*argv));
	120	if (argv == NULL) {
	121	errno = ENOMEM;
	122	return (-1);
	123	}
	124	va_start(ap, arg);
	125	n = 1;
1f2f436a	126	argv[0] = arg;
9385eb3d A	127	while ((argv[n] = va_arg(ap, char *)) != NULL)
	128	n++;
	129	va_end(ap);
1f2f436a	130	return (execvp(name, __DECONST(char **, argv)));
9385eb3d A	131	}
	132
	133	int
	134	execv(name, argv)
	135	const char *name;
	136	char * const *argv;
	137	{
	138	(void)_execve(name, argv, environ);
	139	return (-1);
	140	}
	141
	142	int
3d9156a7 A	143	execvp(const char name, char const *argv)
3d9156a7 A	144	{
1f2f436a	145	return (_execvpe(name, argv, environ));
3d9156a7 A	146	}
3d9156a7 A	147
1f2f436a A	148	static int
	149	execvPe(const char name, const char path, char * const *argv,
	150	char * const *envp)
9385eb3d	151	{
1f2f436a A	152	const char **memp;
1f2f436a A	153	size_t cnt, lp, ln;
9385eb3d	154	int eacces, save_errno;
1f2f436a A	155	char *cur, buf[MAXPATHLEN];
1f2f436a A	156	const char p, bp;
9385eb3d A	157	struct stat sb;
	158
	159	eacces = 0;
	160
	161	/* If it's an absolute or relative path name, it's easy. */
	162	if (index(name, '/')) {
1f2f436a	163	bp = name;
3d9156a7	164	cur = NULL;
9385eb3d A	165	goto retry;
	166	}
	167	bp = buf;
	168
	169	/* If it's an empty path name, fail in the usual POSIX way. */
	170	if (*name == '\0') {
	171	errno = ENOENT;
	172	return (-1);
	173	}
	174
9385eb3d A	175	cur = alloca(strlen(path) + 1);
	176	if (cur == NULL) {
	177	errno = ENOMEM;
	178	return (-1);
	179	}
	180	strcpy(cur, path);
3d9156a7	181	while ((p = strsep(&cur, ":")) != NULL) {
9385eb3d A	182	/*
	183	* It's a SHELL path -- double, leading and trailing colons
	184	* mean the current directory.
	185	*/
3d9156a7	186	if (*p == '\0') {
9385eb3d A	187	p = ".";
	188	lp = 1;
	189	} else
	190	lp = strlen(p);
	191	ln = strlen(name);
	192
	193	/*
	194	* If the path is too long complain. This is a possible
	195	* security issue; given a way to make the path too long
	196	* the user may execute the wrong program.
	197	*/
	198	if (lp + ln + 2 > sizeof(buf)) {
3d9156a7	199	(void)_write(STDERR_FILENO, "execvP: ", 8);
9385eb3d A	200	(void)_write(STDERR_FILENO, p, lp);
	201	(void)_write(STDERR_FILENO, ": path too long\n",
	202	16);
	203	continue;
	204	}
	205	bcopy(p, buf, lp);
	206	buf[lp] = '/';
	207	bcopy(name, buf + lp + 1, ln);
	208	buf[lp + ln + 1] = '\0';
	209
1f2f436a	210	retry: (void)_execve(bp, argv, envp);
3d9156a7	211	switch (errno) {
9385eb3d A	212	case E2BIG:
	213	goto done;
	214	case ELOOP:
	215	case ENAMETOOLONG:
	216	case ENOENT:
	217	break;
	218	case ENOEXEC:
	219	for (cnt = 0; argv[cnt]; ++cnt)
	220	;
	221	memp = alloca((cnt + 2) * sizeof(char *));
	222	if (memp == NULL) {
	223	/* errno = ENOMEM; XXX override ENOEXEC? */
	224	goto done;
	225	}
	226	memp[0] = "sh";
	227	memp[1] = bp;
	228	bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
1f2f436a A	229	(void)_execve(_PATH_BSHELL,
1f2f436a A	230	__DECONST(char **, memp), envp);
9385eb3d A	231	goto done;
	232	case ENOMEM:
	233	goto done;
	234	case ENOTDIR:
	235	break;
	236	case ETXTBSY:
	237	/*
	238	* We used to retry here, but sh(1) doesn't.
	239	*/
	240	goto done;
	241	default:
	242	/*
	243	* EACCES may be for an inaccessible directory or
	244	* a non-executable file. Call stat() to decide
	245	* which. This also handles ambiguities for EFAULT
	246	* and EIO, and undocumented errors like ESTALE.
	247	* We hope that the race for a stat() is unimportant.
	248	*/
	249	save_errno = errno;
	250	if (stat(bp, &sb) != 0)
	251	break;
	252	if (save_errno == EACCES) {
	253	eacces = 1;
	254	continue;
	255	}
	256	errno = save_errno;
	257	goto done;
	258	}
	259	}
	260	if (eacces)
	261	errno = EACCES;
	262	else
	263	errno = ENOENT;
	264	done:
	265	return (-1);
	266	}
1f2f436a A	267
	268	int
	269	execvP(const char name, const char path, char * const argv[])
	270	{
	271	return execvPe(name, path, argv, environ);
	272	}
	273
	274	int
	275	_execvpe(const char name, char const argv[], char * const envp[])
	276	{
	277	const char *path;
	278
	279	/* Get the path we're searching. */
	280	if ((path = getenv("PATH")) == NULL)
	281	path = _PATH_DEFPATH;
	282
	283	return (execvPe(name, path, argv, envp));
	284	}