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Replace our execvpe() replacement with something GPL-compatible.

This commit is contained in:
Gunnar Beutner 2013-08-07 08:47:28 +02:00
parent 662130f47e
commit 905eed509f
2 changed files with 207 additions and 162 deletions
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327
third-party/execvpe/execvpe.c vendored
View File

@ -1,170 +1,207 @@
/* -----------------------------------------------------------------------------
(c) The University of Glasgow 1995-2004
/* Copyright (C) 1991,92, 1995-99, 2002, 2004, 2005, 2007, 2009
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Our low-level exec() variant.
-------------------------------------------------------------------------- */
#include "execvpe.h"
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
#ifdef __GLASGOW_HASKELL__
#include "Rts.h"
#endif
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
#if !(defined(_MSC_VER) || defined(__MINGW32__) || defined(_WIN32) || defined(HAVE_EXECVPE)) /* to the end */
#ifndef __QNXNTO__
/* Evidently non-Posix. */
/* #include "PosixSource.h" */
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <alloca.h>
#include <unistd.h>
#include <sys/time.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <paths.h>
#include "execvpe.h"
/*
* We want the search semantics of execvp, but we want to provide our
* own environment, like execve. The following copyright applies to
* this code, as it is a derivative of execvp:
*-
* Copyright (c) 1991 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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(_MSC_VER) && !defined(HAVE_EXECVPE)
/* The file is accessible but it is not an executable file. Invoke
the shell to interpret it as a script. */
static void
scripts_argv (const char *file, char *const argv[], int argc, char **new_argv)
{
/* Construct an argument list for the shell. */
new_argv[0] = (char *) _PATH_BSHELL;
new_argv[1] = (char *) file;
while (argc > 1)
{
new_argv[argc] = argv[argc - 1];
--argc;
}
}
/* Execute FILE, searching in the `PATH' environment variable if it contains
no slashes, with arguments ARGV and environment from ENVP. */
int
execvpe(char *name, char *const argv[], char **envp)
execvpe (file, argv, envp)
const char *file;
char *const argv[];
char *const envp[];
{
register int lp, ln;
register char *p;
int eacces=0, etxtbsy=0;
char *bp, *cur, *path, *buf = 0;
/* If it's an absolute or relative path name, it's easy. */
if (strchr(name, '/')) {
bp = (char *) name;
cur = path = buf = NULL;
goto retry;
if (*file == '\0')
{
/* We check the simple case first. */
errno = ENOENT;
return -1;
}
/* Get the path we're searching. */
if (!(path = getenv("PATH"))) {
#ifdef HAVE_CONFSTR
ln = confstr(_CS_PATH, NULL, 0);
if ((cur = path = alloca(ln + 1)) != NULL) {
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, ln);
}
#else
if ((cur = path = alloca(1 + 1)) != NULL) {
path[0] = ':';
path[1] = '\0';
}
#endif
} else {
cur = alloca(strlen(path) + 1);
strcpy(cur, path);
path = cur;
}
if (strchr (file, '/') != NULL)
{
/* Don't search when it contains a slash. */
execve (file, argv, envp);
if (path == NULL || (bp = buf = alloca(strlen(path)+strlen(name)+2)) == NULL)
goto done;
if (errno == ENOEXEC)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t len = (argc + 1) * sizeof (char *);
char **script_argv;
void *ptr = NULL;
script_argv = alloca (len);
while (cur != NULL) {
p = cur;
if ((cur = strchr(cur, ':')) != NULL)
*cur++ = '\0';
/*
* It's a SHELL path -- double, leading and trailing colons mean the current
* directory.
*/
if (!*p) {
p = ".";
lp = 1;
} else
lp = strlen(p);
ln = strlen(name);
memcpy(buf, p, lp);
buf[lp] = '/';
memcpy(buf + lp + 1, name, ln);
buf[lp + ln + 1] = '\0';
retry:
(void) execve(bp, argv, envp);
switch (errno) {
case EACCES:
eacces = 1;
break;
case ENOENT:
break;
case ENOEXEC:
if (script_argv != NULL)
{
register size_t cnt;
register char **ap;
scripts_argv (file, argv, argc, script_argv);
execve (script_argv[0], script_argv, envp);
for (cnt = 0, ap = (char **) argv; *ap; ++ap, ++cnt)
;
if ((ap = alloca((cnt + 2) * sizeof(char *))) != NULL) {
memcpy(ap + 2, argv + 1, cnt * sizeof(char *));
ap[0] = "sh";
ap[1] = bp;
(void) execve("/bin/sh", ap, envp);
}
goto done;
free (ptr);
}
case ETXTBSY:
if (etxtbsy < 3)
(void) sleep(++etxtbsy);
goto retry;
default:
goto done;
}
}
if (eacces)
else
{
size_t pathlen;
size_t alloclen = 0;
char *path = getenv ("PATH");
if (path == NULL)
{
pathlen = confstr (_CS_PATH, (char *) NULL, 0);
alloclen = pathlen + 1;
}
else
pathlen = strlen (path);
size_t len = strlen (file) + 1;
alloclen += pathlen + len + 1;
char *name;
name = alloca (alloclen);
if (path == NULL)
{
/* There is no `PATH' in the environment.
The default search path is the current directory
followed by the path `confstr' returns for `_CS_PATH'. */
path = name + pathlen + len + 1;
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, pathlen);
}
/* Copy the file name at the top. */
name = (char *) memcpy (name + pathlen + 1, file, len);
/* And add the slash. */
*--name = '/';
char **script_argv = NULL;
bool got_eacces = false;
char *p = path;
do
{
char *startp;
path = p;
p = strchr (path, ':');
if (!p)
p = path + strlen(path);
if (p == path)
/* Two adjacent colons, or a colon at the beginning or the end
of `PATH' means to search the current directory. */
startp = name + 1;
else
startp = (char *) memcpy (name - (p - path), path, p - path);
/* Try to execute this name. If it works, execve will not return. */
execve (startp, argv, envp);
if (errno == ENOEXEC)
{
if (script_argv == NULL)
{
/* Count the arguments. */
int argc = 0;
while (argv[argc++])
;
size_t arglen = (argc + 1) * sizeof (char *);
script_argv = alloca (arglen);
if (script_argv == NULL)
{
/* A possible EACCES error is not as important as
the ENOMEM. */
got_eacces = false;
break;
}
scripts_argv (startp, argv, argc, script_argv);
}
execve (script_argv[0], script_argv, envp);
}
switch (errno)
{
case EACCES:
/* Record the we got a `Permission denied' error. If we end
up finding no executable we can use, we want to diagnose
that we did find one but were denied access. */
got_eacces = true;
case ENOENT:
case ESTALE:
case ENOTDIR:
/* Those errors indicate the file is missing or not executable
by us, in which case we want to just try the next path
directory. */
case ENODEV:
case ETIMEDOUT:
/* Some strange filesystems like AFS return even
stranger error numbers. They cannot reasonably mean
anything else so ignore those, too. */
break;
default:
/* Some other error means we found an executable file, but
something went wrong executing it; return the error to our
caller. */
return -1;
}
}
while (*p++ != '\0');
/* We tried every element and none of them worked. */
if (got_eacces)
/* At least one failure was due to permissions, so report that
error. */
errno = EACCES;
else if (!errno)
errno = ENOENT;
done:
return (-1);
}
#endif
}
/* Copied verbatim from ghc/lib/std/cbits/system.c. */
void pPrPr_disableITimers (void)
{
#ifdef __GLASGOW_HASKELL__
stopTimer();
#endif
/* Return the error from the last attempt (probably ENOENT). */
return -1;
}
#endif
#endif /* !defined(_MSC_VER) && !defined(HAVE_EXECVPE) */

42
third-party/execvpe/execvpe.h vendored
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@ -1,29 +1,37 @@
/* ----------------------------------------------------------------------------
(c) The University of Glasgow 2004
/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
Interface for code in execvpe.c
------------------------------------------------------------------------- */
#ifndef EXECVPE_H
#define EXECVPE_H
#include "config.h"
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#if !defined(_MSC_VER) && !defined(__MINGW32__) && !defined(_WIN32) && !defined(HAVE_EXECVPE)
# ifndef __QNXNTO__
extern int execvpe(char *name, char *const argv[], char **envp);
# endif
extern void pPrPr_disableITimers (void);
#endif
#if !defined(_MSC_VER) && !defined(HAVE_EXECVPE)
int execvpe(const char *file, char *const argv[], char *const envp[]);
#endif /* !defined(_MSC_VER) && !defined(HAVE_EXECVPE) */
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* EXECVPE_H */