GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/gen/exec.c Lines: 0 98 0.0 %
Date: 2017-11-07 Branches: 0 62 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: exec.c,v 1.23 2016/03/13 18:34:20 guenther 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. 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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#include <sys/types.h>
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#include <sys/uio.h>
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#include <errno.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdarg.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 <unistd.h>
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int
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execl(const char *name, const char *arg, ...)
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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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	va_start(ap, arg);
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	n = 1;
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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 = alloca((n + 1) * sizeof(*argv));
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	if (argv == NULL) {
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		errno = ENOMEM;
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		return (-1);
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	}
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	va_start(ap, arg);
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	n = 1;
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	argv[0] = (char *)arg;
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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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DEF_WEAK(execl);
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int
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execle(const char *name, const char *arg, ...)
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{
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	va_list ap;
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	char **argv, **envp;
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	int n;
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	va_start(ap, arg);
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	n = 1;
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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 = alloca((n + 1) * sizeof(*argv));
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	if (argv == NULL) {
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		errno = ENOMEM;
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		return (-1);
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	}
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	va_start(ap, arg);
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	n = 1;
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	argv[0] = (char *)arg;
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	while ((argv[n] = va_arg(ap, char *)) != NULL)
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		n++;
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	envp = va_arg(ap, char **);
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	va_end(ap);
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	return (execve(name, argv, envp));
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}
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int
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execlp(const char *name, const char *arg, ...)
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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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	va_start(ap, arg);
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	n = 1;
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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 = alloca((n + 1) * sizeof(*argv));
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	if (argv == NULL) {
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		errno = ENOMEM;
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		return (-1);
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	}
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	va_start(ap, arg);
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	n = 1;
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	argv[0] = (char *)arg;
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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 (execvp(name, argv));
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}
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int
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execv(const char *name, 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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execvpe(const char *name, char *const *argv, char *const *envp)
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{
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	char **memp;
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	int cnt;
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	size_t lp, ln, len;
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	char *p;
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	int eacces = 0;
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	char *bp, *cur, *path, buf[PATH_MAX];
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	/*
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	 * Do not allow null name
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	 */
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	if (name == NULL || *name == '\0') {
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		errno = ENOENT;
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		return (-1);
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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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	len = strlen(path) + 1;
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	cur = alloca(len);
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	if (cur == NULL) {
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		errno = ENOMEM;
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		return (-1);
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	}
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	strlcpy(cur, path, len);
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	path = cur;
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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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			struct iovec iov[3];
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			iov[0].iov_base = "execvp: ";
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			iov[0].iov_len = 8;
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			iov[1].iov_base = p;
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			iov[1].iov_len = lp;
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			iov[2].iov_base = ": path too long\n";
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			iov[2].iov_len = 16;
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			(void)writev(STDERR_FILENO, iov, 3);
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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, envp);
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		switch(errno) {
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		case E2BIG:
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			goto done;
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		case EISDIR:
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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 = alloca((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, envp);
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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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		case EACCES:
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			eacces = 1;
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			break;
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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:
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	return (-1);
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}
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DEF_WEAK(execvpe);
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int
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execvp(const char *name, char *const *argv)
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{
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    return execvpe(name, argv, environ);
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}
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DEF_WEAK(execvp);
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