51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
|
/*
|
||
|
|
* gcc rename_failure.c -o rename_failure.so -shared -ldl
|
||
|
|
* LD_PRELOAD=./rename_failure.so FAILURE_PATH=/etc/shadow ./test /etc/shadow
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define _GNU_SOURCE
|
||
|
|
#include <dlfcn.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <stdarg.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <errno.h>
|
||
|
|
#include <assert.h>
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
|
||
|
|
typedef int (*rename_type) (const char *old, const char *new);
|
||
|
|
static rename_type next_rename;
|
||
|
|
|
||
|
|
static const char *failure_path = NULL;
|
||
|
|
|
||
|
|
int rename (const char *old, const char *new)
|
||
|
|
{
|
||
|
|
if (NULL == next_rename)
|
||
|
|
{
|
||
|
|
next_rename = dlsym (RTLD_NEXT, "rename");
|
||
|
|
assert (NULL != next_rename);
|
||
|
|
}
|
||
|
|
if (NULL == failure_path) {
|
||
|
|
failure_path = getenv ("FAILURE_PATH");
|
||
|
|
if (NULL == failure_path) {
|
||
|
|
fputs ("No FAILURE_PATH defined\n", stderr);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( (NULL != new)
|
||
|
|
&& (NULL != failure_path)
|
||
|
|
&& (strcmp (new, failure_path) == 0))
|
||
|
|
{
|
||
|
|
fprintf (stderr, "rename FAILURE %s %s\n", old, new);
|
||
|
|
errno = EIO;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return next_rename (old, new);
|
||
|
|
}
|
||
|
|
|