freebsd-skq/lib/libc/gen/exec.c

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/*-
* 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("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
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#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"
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extern char **environ;
int
execl(const char *name, const char *arg, ...)
{
va_list ap;
char **argv;
int n;
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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);
}
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va_start(ap, arg);
n = 1;
argv[0] = (char *)arg;
while ((argv[n] = va_arg(ap, char *)) != NULL)
n++;
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va_end(ap);
return (_execve(name, argv, environ));
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}
int
execle(const char *name, const char *arg, ...)
{
va_list ap;
char **argv, **envp;
int n;
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va_start(ap, arg);
n = 1;
while (va_arg(ap, char *) != NULL)
n++;
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va_end(ap);
argv = alloca((n + 1) * sizeof(*argv));
if (argv == NULL) {
errno = ENOMEM;
return (-1);
}
va_start(ap, arg);
n = 1;
argv[0] = (char *)arg;
while ((argv[n] = va_arg(ap, char *)) != NULL)
n++;
envp = va_arg(ap, char **);
va_end(ap);
return (_execve(name, argv, envp));
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}
int
execlp(const char *name, const char *arg, ...)
{
va_list ap;
char **argv;
int n;
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va_start(ap, arg);
n = 1;
while (va_arg(ap, char *) != NULL)
n++;
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va_end(ap);
argv = alloca((n + 1) * sizeof(*argv));
if (argv == NULL) {
errno = ENOMEM;
return (-1);
}
va_start(ap, arg);
n = 1;
argv[0] = (char *)arg;
while ((argv[n] = va_arg(ap, char *)) != NULL)
n++;
va_end(ap);
return (execvp(name, argv));
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}
int
execv(name, argv)
const char *name;
char * const *argv;
{
(void)_execve(name, argv, environ);
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return (-1);
}
int
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execvp(const char *name, char * const *argv)
{
const char *path;
/* Get the path we're searching. */
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if ((path = getenv("PATH")) == NULL)
path = _PATH_DEFPATH;
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return (execvP(name, path, argv));
}
int
execvP(name, path, argv)
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const char *name;
const char *path;
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char * const *argv;
{
char **memp;
int cnt, lp, ln;
char *p;
int eacces, save_errno;
char *bp, *cur, buf[MAXPATHLEN];
struct stat sb;
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eacces = 0;
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/* If it's an absolute or relative path name, it's easy. */
if (index(name, '/')) {
bp = (char *)name;
cur = NULL;
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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);
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while ((p = strsep(&cur, ":")) != NULL) {
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/*
* It's a SHELL path -- double, leading and trailing colons
* mean the current directory.
*/
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if (*p == '\0') {
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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);
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continue;
}
bcopy(p, buf, lp);
buf[lp] = '/';
bcopy(name, buf + lp + 1, ln);
buf[lp + ln + 1] = '\0';
retry: (void)_execve(bp, argv, environ);
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switch (errno) {
case E2BIG:
goto done;
case ELOOP:
case ENAMETOOLONG:
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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;
}
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memp[0] = "sh";
memp[1] = bp;
bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
(void)_execve(_PATH_BSHELL, memp, environ);
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goto done;
case ENOMEM:
goto done;
case ENOTDIR:
break;
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case ETXTBSY:
/*
* We used to retry here, but sh(1) doesn't.
*/
goto done;
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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;
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goto done;
}
}
if (eacces)
errno = EACCES;
else
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errno = ENOENT;
done:
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return (-1);
}