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/*
* 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);
}
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