Dir *DirOpen(const char *dirname)
{
Dir *ret = xcalloc(1, sizeof(Dir));
ret->dirh = opendir(dirname);
if (ret->dirh == NULL)
{
free(ret);
return NULL;
}
size_t dirent_buf_size = GetDirentBufferSize(GetNameMax(ret->dirh));
ret->entrybuf = xcalloc(1, dirent_buf_size);
return ret;
}
Dir *DirOpen(const char *dirname)
{
Dir *ret = xcalloc(1, sizeof(Dir));
int safe_fd;
safe_fd = safe_open(dirname, O_RDONLY);
if (safe_fd < 0)
{
free(ret);
return NULL;
}
ret->dirh = opendir(dirname);
if (ret->dirh == NULL)
{
close(safe_fd);
free(ret);
return NULL;
}
struct stat safe_stat, dir_stat;
bool stat_failed = fstat(safe_fd, &safe_stat) < 0 || fstat(dirfd(ret->dirh), &dir_stat) < 0;
close(safe_fd);
if (stat_failed)
{
closedir(ret->dirh);
free(ret);
return NULL;
}
// Make sure we opened the same file descriptor as safe_open did.
if (safe_stat.st_dev != dir_stat.st_dev || safe_stat.st_ino != dir_stat.st_ino)
{
closedir(ret->dirh);
free(ret);
errno = EACCES;
return NULL;
}
size_t dirent_buf_size = GetDirentBufferSize(GetNameMax(ret->dirh));
ret->entrybuf = xcalloc(1, dirent_buf_size);
return ret;
}
