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/*
* gcc open_RDONLY_failure.c -o open_RDONLY_failure.so -shared -ldl
* LD_PRELOAD=./open_RDONLY_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 (*open_type) (const char *pathname, int flag, ...);
static open_type next_open64;
static const char *failure_path = NULL;
int open64 (const char *pathname, int flag, ...)
{
if (NULL == next_open64)
{
next_open64 = dlsym (RTLD_NEXT, "open64");
assert (NULL != next_open64);
}
if (NULL == failure_path) {
failure_path = getenv ("FAILURE_PATH");
if (NULL == failure_path) {
fputs ("No FAILURE_PATH defined\n", stderr);
}
}
if ( (NULL != pathname)
&& ((flag & O_ACCMODE) == O_RDONLY)
&& (NULL != failure_path)
&& (strcmp (pathname, failure_path) == 0))
{
fprintf (stderr, "open FAILURE %s %x ...\n", pathname, flag&O_ACCMODE);
errno = EIO;
return -1;
}
return next_open64 (pathname, flag);
}
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