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/*
libfakechroot -- fake chroot environment
Copyright (c) 2010-2015 Piotr Roszatycki <dexter@debian.org>
This 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.
This 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.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __LIBFAKECHROOT_H
#define __LIBFAKECHROOT_H
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include "rel2abs.h"
#include "rel2absat.h"
#define debug fakechroot_debug
#ifdef HAVE___ATTRIBUTE__VISIBILITY
# define LOCAL __attribute__((visibility("hidden")))
#else
# define LOCAL
#endif
#ifdef HAVE___ATTRIBUTE__CONSTRUCTOR
# define CONSTRUCTOR __attribute__((constructor))
#else
# define CONSTRUCTOR
#endif
#ifdef HAVE___ATTRIBUTE__SECTION_DATA_FAKECHROOT
# define SECTION_DATA_FAKECHROOT __attribute__((section("data.fakechroot")))
#else
# define SECTION_DATA_FAKECHROOT
#endif
#if defined(PATH_MAX)
# define FAKECHROOT_PATH_MAX PATH_MAX
#elif defined(_POSIX_PATH_MAX)
# define FAKECHROOT_PATH_MAX _POSIX_PATH_MAX
#elif defined(MAXPATHLEN)
# define FAKECHROOT_PATH_MAX MAXPATHLEN
#else
# define FAKECHROOT_PATH_MAX 2048
#endif
#ifndef UNIX_PATH_MAX
# define UNIX_PATH_MAX 108
#endif
#ifdef AF_UNIX
# ifndef SUN_LEN
# define SUN_LEN(su) (sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
# endif
#endif
#ifndef __set_errno
# define __set_errno(e) (errno = (e))
#endif
#ifndef HAVE_VFORK
# define vfork fork
#endif
#define narrow_chroot_path(path) \
{ \
if ((path) != NULL && *((char *)(path)) != '\0') { \
const char *fakechroot_base = getenv("FAKECHROOT_BASE"); \
if (fakechroot_base != NULL) { \
char *fakechroot_ptr = strstr((path), fakechroot_base); \
if (fakechroot_ptr == (path)) { \
const size_t fakechroot_base_len = strlen(fakechroot_base); \
const size_t path_len = strlen(path); \
if (path_len == fakechroot_base_len) { \
((char *)(path))[0] = '/'; \
((char *)(path))[1] = '\0'; \
} \
else if ( ((char *)(path))[fakechroot_base_len] == '/' ) { \
memmove((void *)(path), (path) + fakechroot_base_len, 1 + path_len - fakechroot_base_len); \
} \
} \
} \
} \
}
#define expand_chroot_rel_path(path) \
{ \
if (!fakechroot_localdir(path)) { \
if ((path) != NULL && *((char *)(path)) == '/') { \
const char *fakechroot_base = getenv("FAKECHROOT_BASE"); \
if (fakechroot_base != NULL ) { \
char fakechroot_buf[FAKECHROOT_PATH_MAX]; \
snprintf(fakechroot_buf, FAKECHROOT_PATH_MAX, "%s%s", fakechroot_base, (path)); \
(path) = fakechroot_buf; \
} \
} \
} \
}
#define expand_chroot_path(path) \
{ \
if (!fakechroot_localdir(path)) { \
if ((path) != NULL) { \
char fakechroot_abspath[FAKECHROOT_PATH_MAX]; \
rel2abs((path), fakechroot_abspath); \
(path) = fakechroot_abspath; \
expand_chroot_rel_path(path); \
} \
} \
}
#define expand_chroot_path_at(dirfd, path) \
{ \
if (!fakechroot_localdir(path)) { \
if ((path) != NULL) { \
char fakechroot_abspath[FAKECHROOT_PATH_MAX]; \
rel2absat(dirfd, (path), fakechroot_abspath); \
(path) = fakechroot_abspath; \
expand_chroot_rel_path(path); \
} \
} \
}
#define wrapper_decl_proto(function) \
extern LOCAL struct fakechroot_wrapper fakechroot_##function##_wrapper_decl SECTION_DATA_FAKECHROOT
#define wrapper_decl(function) \
LOCAL struct fakechroot_wrapper fakechroot_##function##_wrapper_decl SECTION_DATA_FAKECHROOT = { \
(fakechroot_wrapperfn_t) function, \
NULL, \
#function \
}
#define wrapper_fn_t(function, return_type, arguments) \
typedef return_type (*fakechroot_##function##_fn_t) arguments
#define wrapper_proto(function, return_type, arguments) \
extern return_type function arguments; \
wrapper_fn_t(function, return_type, arguments); \
wrapper_decl_proto(function)
#if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline && defined __va_arg_pack_len
# define wrapper_fn_name(function) __##function##_alias
# define wrapper_proto_alias(function, return_type, arguments) \
extern return_type __REDIRECT (wrapper_fn_name(function), arguments, function); \
wrapper_fn_t(function, return_type, arguments); \
wrapper_decl_proto(function)
#else
# define wrapper_fn_name(function) function
# define wrapper_proto_alias(function, return_type, arguments) \
wrapper_proto(function, return_type, arguments)
#endif
#define wrapper(function, return_type, arguments) \
wrapper_proto(function, return_type, arguments); \
wrapper_decl(function); \
return_type function arguments
#define wrapper_alias(function, return_type, arguments) \
wrapper_proto_alias(function, return_type, arguments); \
wrapper_decl(function); \
return_type wrapper_fn_name(function) arguments
#define nextcall(function) \
( \
(fakechroot_##function##_fn_t)( \
fakechroot_##function##_wrapper_decl.nextfunc ? \
fakechroot_##function##_wrapper_decl.nextfunc : \
fakechroot_loadfunc(&fakechroot_##function##_wrapper_decl) \
) \
)
#ifdef __GNUC__
# if __GNUC__ >= 6
# pragma GCC diagnostic ignored "-Wnonnull-compare"
# endif
#endif
#ifdef __clang__
# if __clang_major__ >= 4 || __clang_major__ == 3 && __clang_minor__ >= 6
# pragma clang diagnostic ignored "-Wpointer-bool-conversion"
# endif
#endif
typedef void (*fakechroot_wrapperfn_t)(void);
struct fakechroot_wrapper {
fakechroot_wrapperfn_t func;
fakechroot_wrapperfn_t nextfunc;
const char *name;
};
extern char *preserve_env_list[];
extern const int preserve_env_list_count;
int fakechroot_debug (const char *, ...);
fakechroot_wrapperfn_t fakechroot_loadfunc (struct fakechroot_wrapper *);
int fakechroot_localdir (const char *);
int fakechroot_try_cmd_subst (char *, const char *, char *);
/* We don't want to define _BSD_SOURCE and _DEFAULT_SOURCE and include stdio.h */
#ifndef snprintf
int snprintf(char *, size_t, const char *, ...);
#endif
#endif
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