text: /*-
   * Copyright (c) 2012-2013 The FreeBSD Foundation
   * All rights reserved.
   *
   * This software was developed by Pawel Jakub Dawidek under sponsorship from
   * the FreeBSD Foundation.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <libcapsicum.h>
  #include <libcasper.h>
  #include <nv.h>
  #include <pjdlog.h>
  
  #include "local.h"
  
  #define	MAXSIZE	(1024 * 1024)
  
  static int
  random_command(const char *cmd, const nvlist_t *limits, nvlist_t *nvlin,
      nvlist_t *nvlout)
  {
  	void *data;
  	size_t size;
  
  	if (strcmp(cmd, "generate") != 0)
  		return (EINVAL);
  	if (!nvlist_exists_number(nvlin, "size"))
  		return (EINVAL);
  
  	size = (size_t)nvlist_get_number(nvlin, "size");
  	if (size == 0 || size > MAXSIZE)
  		return (EINVAL);
  
  	data = malloc(size);
  	if (data == NULL)
  		return (ENOMEM);
  
  	arc4random_buf(data, size);
  
  	nvlist_move_binary(nvlout, "data", data, size);
  
  	return (0);
  }
  
  int
  main(int argc, char *argv[])
  {
  
  	/*
  	 * TODO: Sandbox this.
  	 */
  
  	return (service_start("system.random", PARENT_FILENO, NULL,
  	    random_command, argc, argv));
  }
  