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/*
* virfilewrapper.c: Wrapper for universal file access
*
* 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, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifndef WIN32
# include <fcntl.h>
# include "viralloc.h"
# include "virfilewrapper.h"
# include "virmock.h"
/* Mapping for prefix overrides */
static size_t noverrides;
static const char **overrides;
/* nprefixes == noverrides, but two variables make it easier to use
* VIR_*_ELEMENT macros */
static size_t nprefixes;
static const char **prefixes;
/* TODO: callbacks */
static int (*real_open)(const char *path, int flags, ...);
# if WITH___OPEN_2
static int (*real___open_2)(const char *path, int flags);
# endif
static FILE *(*real_fopen)(const char *path, const char *mode);
static int (*real_access)(const char *path, int mode);
static int (*real_mkdir)(const char *path, mode_t mode);
static DIR *(*real_opendir)(const char *path);
static int (*real_execv)(const char *path, char *const argv[]);
static int (*real_execve)(const char *path, char *const argv[], char *const envp[]);
static void init_syms(void)
{
if (real_fopen)
return;
VIR_MOCK_REAL_INIT(fopen);
VIR_MOCK_REAL_INIT(access);
VIR_MOCK_REAL_INIT(mkdir);
# if defined(__GLIBC__) && defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
VIR_MOCK_REAL_INIT_ALIASED(open, "open64");
# else
VIR_MOCK_REAL_INIT(open);
# endif
# if WITH___OPEN_2
VIR_MOCK_REAL_INIT(__open_2);
# endif
# if defined(__APPLE__) && defined(__x86_64__)
VIR_MOCK_REAL_INIT_ALIASED(opendir, "opendir$INODE64");
# else
VIR_MOCK_REAL_INIT(opendir);
# endif
VIR_MOCK_REAL_INIT(execv);
VIR_MOCK_REAL_INIT(execve);
}
void
virFileWrapperAddPrefix(const char *prefix,
const char *override)
{
/* Both parameters are mandatory */
if (!prefix || !override) {
fprintf(stderr, "Attempt to add invalid path override\n");
abort();
}
init_syms();
VIR_APPEND_ELEMENT(prefixes, nprefixes, prefix);
VIR_APPEND_ELEMENT(overrides, noverrides, override);
}
void
virFileWrapperRemovePrefix(const char *prefix)
{
size_t i = 0;
for (i = 0; i < noverrides; i++) {
if (STREQ(prefixes[i], prefix))
break;
}
if (i == noverrides)
return;
VIR_DELETE_ELEMENT(overrides, i, noverrides);
VIR_DELETE_ELEMENT(prefixes, i, nprefixes);
}
void
virFileWrapperClearPrefixes(void)
{
nprefixes = 0;
noverrides = 0;
VIR_FREE(prefixes);
VIR_FREE(overrides);
}
# include "virmockstathelpers.c"
int
virMockStatRedirect(const char *path, char **newpath)
{
size_t i = 0;
for (i = 0; i < noverrides; i++) {
const char *tmp = STRSKIP(path, prefixes[i]);
if (!tmp)
continue;
*newpath = g_strdup_printf("%s%s", overrides[i], tmp);
break;
}
return 0;
}
# define PATH_OVERRIDE(newpath, path) \
do { \
init_syms(); \
\
if (virMockStatRedirect(path, &newpath) < 0) \
abort(); \
} while (0)
FILE *fopen(const char *path, const char *mode)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_fopen(newpath ? newpath : path, mode);
}
int access(const char *path, int mode)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_access(newpath ? newpath : path, mode);
}
int open(const char *path, int flags, ...)
{
g_autofree char *newpath = NULL;
va_list ap;
mode_t mode = 0;
PATH_OVERRIDE(newpath, path);
/* The mode argument is mandatory when O_CREAT is set in flags,
* otherwise the argument is ignored.
*/
if (flags & O_CREAT) {
va_start(ap, flags);
mode = (mode_t) va_arg(ap, int);
va_end(ap);
}
return real_open(newpath ? newpath : path, flags, mode);
}
# if WITH___OPEN_2
int
__open_2(const char *path, int flags)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real___open_2(newpath ? newpath : path, flags);
}
# endif
DIR *opendir(const char *path)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_opendir(newpath ? newpath : path);
}
int execv(const char *path, char *const argv[])
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_execv(newpath ? newpath : path, argv);
}
int execve(const char *path, char *const argv[], char *const envp[])
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_execve(newpath ? newpath : path, argv, envp);
}
#endif
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