149 lines
4.2 KiB
C
149 lines
4.2 KiB
C
/* $NetBSD: execvp.c,v 1.2 1997/04/24 18:55:51 kleink Exp $ */
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/*-
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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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#else
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static char rcsid[] = "$NetBSD: execvp.c,v 1.2 1997/04/24 18:55:51 kleink Exp $";
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <paths.h>
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extern char **environ;
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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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static int memsize;
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static char **memp;
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register int cnt, lp, ln;
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register char *p;
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int eacces = 0, etxtbsy = 0;
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char *bp, *cur, *path, buf[PATH_MAX];
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/* "" is not a valid filename; check this before traversing PATH. */
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if (name[0] == '\0') {
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errno = ENOENT;
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goto done;
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}
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/* If it's an absolute or relative path name, it's easy. */
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if (strchr(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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/* 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 EACCES:
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eacces = 1;
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break;
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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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if ((cnt + 2) * sizeof(char *) > memsize) {
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memsize = (cnt + 2) * sizeof(char *);
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if ((memp = realloc(memp, memsize)) == NULL) {
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memsize = 0;
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goto done;
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}
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}
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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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goto done;
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case ETXTBSY:
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if (etxtbsy < 3)
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(void)sleep(++etxtbsy);
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goto retry;
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default:
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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 if (!errno)
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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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