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libxbps: implement xbps_file_exec() with posix_spawn().

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This commit is contained in:
Juan RP 2012-05-30 14:45:47 +02:00
parent c93d1637ae
commit 5aa05f4c72
9 changed files with 138 additions and 182 deletions
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2
3RDPARTY
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@ -13,8 +13,6 @@ internal use in the code:
- mkpath from NetBSD's mkdir(1): lib/external/mkpath.c
- fexec from NetBSD's pkg_install: lib/external/fexec.c
- libfetch-2.31 from NetBSD: lib/fetch
- portableproplib-0.4.1 (lib/portableproplib) from

2
COPYING
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@ -140,7 +140,7 @@ This product uses some code with the following license
*/
This product uses some code with the following license
(lib/humanize_number.c, lib/fexec.c):
(lib/humanize_number.c):
/*
* Copyright (c) 2003 The NetBSD Foundation, Inc.

3
NEWS
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@ -1,5 +1,8 @@
xbps-0.16 (???):
* libxbps: implemented xbps_file_exec thru posix_spawn. That means
posix_spawn() is now required in xbps.
* libxbps: renamed xbps_repository_pool_xxx to xbps_rpool_xxx
(API/ABI incompat changes).

22
configure vendored
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@ -305,6 +305,28 @@ if [ -n "$BUILD_PIE" ]; then
fi
fi
#
# Check for posix_spawn (required).
#
func=posix_spawn
printf "Checking for $func() ... "
cat <<EOF > _$func.c
#include <stdio.h>
#include <spawn.h>
int main(void) {
posix_spawn(NULL, NULL, NULL, NULL, NULL, NULL);
return 0;
}
EOF
if $XCC _${func}.c -o _${func} 2>/dev/null; then
rm -f _$func.c _$func
echo "yes."
else
echo "not found! $func is required by xbps, exiting..."
rm -f _$func.c _$func
exit 1
fi
#
# Check for vasprintf().
#

2
include/xbps_api.h
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@ -56,7 +56,7 @@
*/
#define XBPS_PKGINDEX_VERSION "1.4"
#define XBPS_API_VERSION "20120530-2"
#define XBPS_API_VERSION "20120530-3"
#define XBPS_VERSION "0.16"
/**

4
include/xbps_api_impl.h
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@ -165,11 +165,9 @@ char HIDDEN *xbps_get_remote_repo_string(const char *);
/**
* @private
* From lib/fexec.c
* From lib/file_exec.c
*/
int HIDDEN xbps_file_exec(const char *, ...);
int HIDDEN xbps_file_exec_skipempty(const char *, ...);
int HIDDEN xbps_file_chdir_exec(const char *, const char *, ...);
/**
* @private

4
lib/Makefile
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@ -37,7 +37,7 @@ LIBFETCH_OBJS =
endif
# External code used by libxbps
EXTOBJS = external/dewey.o external/fexec.o external/humanize_number.o
EXTOBJS = external/dewey.o external/humanize_number.o
EXTOBJS += external/match.o external/mkpath.o
# libxbps
@ -46,7 +46,7 @@ OBJS += package_remove.o package_remove_obsoletes.o package_state.o
OBJS += package_unpack.o package_requiredby.o package_register.o
OBJS += transaction_commit.o transaction_package_replace.o
OBJS += transaction_dictionary.o transaction_sortdeps.o transaction_ops.o
OBJS += download.o initend.o pkgdb.o
OBJS += download.o initend.o pkgdb.o file_exec.o
OBJS += plist.o plist_archive_entry.o plist_find.o plist_match.o
OBJS += plist_remove.o plist_fetch.o util.o util_hash.o
OBJS += repository_finddeps.o cb_util.o

173
lib/external/fexec.c vendored
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@ -1,173 +0,0 @@
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "xbps_api_impl.h"
static int
pfcexec(const char *path, const char *file, const char **argv)
{
pid_t child;
int status;
bool do_chroot = false;
child = vfork();
switch (child) {
case 0:
if (getuid() == 0 && access("./bin/sh", X_OK) == 0)
do_chroot = true;
/*
* If uid==0 and /bin/sh exists, we can change root directory,
* fork and execute the command. Otherwise just change current
* directory and fork/execute.
*/
if (path && do_chroot) {
if (chroot(path) == -1)
_exit(127);
if (chdir("/") == -1)
_exit(127);
} else if (path && !do_chroot) {
if (chdir(path) == -1)
_exit(127);
} else if (path == NULL && do_chroot) {
if (chroot(".") == -1) {
if (errno != EPERM)
_exit(127);
if (chdir(".") == -1)
_exit(127);
} else {
if (chdir("/") == -1)
_exit(127);
}
}
(void)execv(file, __UNCONST(argv));
_exit(127);
/* NOTREACHED */
case -1:
return -1;
}
while (waitpid(child, &status, 0) < 0) {
if (errno != EINTR)
return -1;
}
if (!WIFEXITED(status))
return -1;
return WEXITSTATUS(status);
}
static int
vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
{
const char **argv;
size_t argv_size, argc;
int retval;
argv_size = 16;
if ((argv = malloc(argv_size * sizeof(*argv))) == NULL) {
errno = ENOMEM;
return -1;
}
argv[0] = arg;
argc = 1;
do {
if (argc == argv_size) {
argv_size *= 2;
argv = realloc(argv, argv_size * sizeof(*argv));
if (argv == NULL) {
errno = ENOMEM;
return -1;
}
}
arg = va_arg(ap, const char *);
if (skipempty && arg && strlen(arg) == 0)
continue;
argv[argc++] = arg;
} while (arg != NULL);
retval = pfcexec(path, argv[0], argv);
free(argv);
return retval;
}
int HIDDEN
xbps_file_exec(const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(NULL, 0, arg, ap);
va_end(ap);
return result;
}
int HIDDEN
xbps_file_exec_skipempty(const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(NULL, 1, arg, ap);
va_end(ap);
return result;
}
int HIDDEN
xbps_file_chdir_exec(const char *path, const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(path, 0, arg, ap);
va_end(ap);
return result;
}

108
lib/file_exec.c Normal file
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@ -0,0 +1,108 @@
/*-
* Copyright (c) 2012 Juan Romero Pardines.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <spawn.h>
#include "xbps_api_impl.h"
static int
pfcexec(const char *file, const char **argv)
{
pid_t child;
int status, rv;
if (((getuid() == 0) && (access("bin/sh", X_OK) == 0))) {
if ((chroot(".") != 0) && (chdir("/") != 0))
return errno;
}
if ((rv = posix_spawn(&child, file, NULL, NULL,
(char ** const)__UNCONST(argv),
NULL)) == 0) {
while (waitpid(child, &status, 0) < 0) {
if (errno != EINTR)
return errno;
}
if (!WIFEXITED(status))
return errno;
return WEXITSTATUS(status);
}
return rv;
}
static int
vfcexec(const char *arg, va_list ap)
{
const char **argv;
size_t argv_size, argc;
int retval;
argv_size = 16;
if ((argv = malloc(argv_size * sizeof(*argv))) == NULL) {
errno = ENOMEM;
return -1;
}
argv[0] = arg;
argc = 1;
do {
if (argc == argv_size) {
argv_size *= 2;
argv = realloc(argv, argv_size * sizeof(*argv));
if (argv == NULL) {
errno = ENOMEM;
return -1;
}
}
arg = va_arg(ap, const char *);
argv[argc++] = arg;
} while (arg != NULL);
retval = pfcexec(argv[0], argv);
free(argv);
return retval;
}
int HIDDEN
xbps_file_exec(const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(arg, ap);
va_end(ap);
return result;
}