316 lines
6.9 KiB
C
316 lines
6.9 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
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#endif
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static const char rcsid[] =
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"$Id: exec.c,v 1.7 1997/11/20 15:09:38 bde Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <paths.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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extern char **environ;
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static char **
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buildargv(ap, arg, envpp)
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va_list ap;
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const char *arg;
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char ***envpp;
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{
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register char **argv, **nargv;
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register int memsize, off;
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argv = NULL;
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for (off = memsize = 0;; ++off) {
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if (off >= memsize) {
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memsize += 50; /* Starts out at 0. */
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memsize *= 2; /* Ramp up fast. */
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nargv = realloc(argv, memsize * sizeof(char *));
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if (nargv == NULL) {
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free(argv);
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return (NULL);
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}
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argv = nargv;
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if (off == 0) {
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argv[0] = (char *)arg;
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off = 1;
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}
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}
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if (!(argv[off] = va_arg(ap, char *)))
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break;
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}
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/* Get environment pointer if user supposed to provide one. */
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if (envpp)
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*envpp = va_arg(ap, char **);
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return (argv);
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}
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int
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#if __STDC__
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execl(const char *name, const char *arg, ...)
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#else
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execl(name, arg, va_alist)
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const char *name;
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const char *arg;
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va_dcl
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#endif
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{
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va_list ap;
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char **argv;
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int n;
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/* The following code is ugly, but makes execl() vfork()-safe. */
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#if __STDC__
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va_start(ap, arg);
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#else
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va_start(ap);
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#endif
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n = 0;
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while (va_arg(ap, char *) != NULL)
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n++ ;
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va_end(ap);
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argv = (char **)alloca((n + 1) * sizeof(*argv));
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if (argv == NULL)
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return (-1);
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#if __STDC__
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va_start(ap, arg);
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#else
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va_start(ap);
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#endif
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n = 0;
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while ((argv[n] = va_arg(ap, char *)) != NULL)
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n++;
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va_end(ap);
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return (execve(name, argv, environ));
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}
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int
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#if __STDC__
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execle(const char *name, const char *arg, ...)
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#else
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execle(name, arg, va_alist)
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const char *name;
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const char *arg;
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va_dcl
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#endif
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{
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va_list ap;
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int sverrno;
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char **argv, **envp;
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#if __STDC__
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va_start(ap, arg);
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#else
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va_start(ap);
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#endif
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if ( (argv = buildargv(ap, arg, &envp)) )
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(void)execve(name, argv, envp);
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va_end(ap);
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sverrno = errno;
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free(argv);
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errno = sverrno;
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return (-1);
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}
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int
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#if __STDC__
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execlp(const char *name, const char *arg, ...)
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#else
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execlp(name, arg, va_alist)
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const char *name;
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const char *arg;
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va_dcl
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#endif
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{
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va_list ap;
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int sverrno;
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char **argv;
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#if __STDC__
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va_start(ap, arg);
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#else
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va_start(ap);
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#endif
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if ( (argv = buildargv(ap, arg, NULL)) )
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(void)execvp(name, argv);
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va_end(ap);
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sverrno = errno;
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free(argv);
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errno = sverrno;
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return (-1);
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}
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int
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execv(name, argv)
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const char *name;
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char * const *argv;
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{
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(void)execve(name, argv, environ);
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return (-1);
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}
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int
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execvp(name, argv)
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const char *name;
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char * const *argv;
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{
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char **memp;
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register int cnt, lp, ln;
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register char *p;
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int eacces, save_errno;
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char *bp, *cur, *path, buf[MAXPATHLEN];
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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. */
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if (index(name, '/')) {
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bp = (char *)name;
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cur = path = NULL;
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goto retry;
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}
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bp = buf;
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/* If it's an empty path name, fail in the usual POSIX way. */
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if (*name == '\0') {
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errno = ENOENT;
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return (-1);
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}
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/* Get the path we're searching. */
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if (!(path = getenv("PATH")))
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path = _PATH_DEFPATH;
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cur = path = strdup(path);
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while ( (p = strsep(&cur, ":")) ) {
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/*
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* It's a SHELL path -- double, leading and trailing colons
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* mean the current directory.
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*/
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if (!*p) {
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p = ".";
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lp = 1;
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} else
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lp = strlen(p);
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ln = strlen(name);
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/*
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* If the path is too long complain. This is a possible
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* security issue; given a way to make the path too long
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* the user may execute the wrong program.
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*/
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if (lp + ln + 2 > sizeof(buf)) {
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(void)write(STDERR_FILENO, "execvp: ", 8);
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(void)write(STDERR_FILENO, p, lp);
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(void)write(STDERR_FILENO, ": path too long\n", 16);
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continue;
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}
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bcopy(p, buf, lp);
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buf[lp] = '/';
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bcopy(name, buf + lp + 1, ln);
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buf[lp + ln + 1] = '\0';
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retry: (void)execve(bp, argv, environ);
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switch(errno) {
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case E2BIG:
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goto done;
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case ELOOP:
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case ENAMETOOLONG:
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case ENOENT:
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break;
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case ENOEXEC:
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for (cnt = 0; argv[cnt]; ++cnt)
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;
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memp = malloc((cnt + 2) * sizeof(char *));
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if (memp == NULL)
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goto done;
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memp[0] = "sh";
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memp[1] = bp;
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bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
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(void)execve(_PATH_BSHELL, memp, environ);
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free(memp);
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goto done;
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case ENOMEM:
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goto done;
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case ENOTDIR:
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break;
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case ETXTBSY:
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/*
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* We used to retry here, but sh(1) doesn't.
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*/
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goto done;
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default:
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/*
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* EACCES may be for an inaccessible directory or
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* a non-executable file. Call stat() to decide
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* which. This also handles ambiguities for EFAULT
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* and EIO, and undocumented errors like ESTALE.
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* We hope that the race for a stat() is unimportant.
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*/
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save_errno = errno;
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if (stat(bp, &sb) != 0)
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break;
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if (save_errno == EACCES) {
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eacces = 1;
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continue;
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}
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errno = save_errno;
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goto done;
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}
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}
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if (eacces)
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errno = EACCES;
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else
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errno = ENOENT;
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done: if (path)
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free(path);
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return (-1);
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}
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