nes-proj/os/net/ipv6/uip-debug.c

/*
 * Copyright (c) 2010, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * 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.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
 *
 */

/**
 * \file
 *         A set of debugging tools for the IP stack
 * \author
 *         Nicolas Tsiftes <nvt@sics.se>
 *         Niclas Finne <nfi@sics.se>
 *         Joakim Eriksson <joakime@sics.se>
 */

#include "net/ipv6/uip-debug.h"
#include "net/ipv6/ip64-addr.h"

/*---------------------------------------------------------------------------*/
void
uip_debug_ipaddr_print(const uip_ipaddr_t *addr)
{
  uint16_t a;
  unsigned int i;
  int f;

  if(addr == NULL) {
    PRINTA("(NULL IP addr)");
    return;
  }

  if(ip64_addr_is_ipv4_mapped_addr(addr)) {
    /*
     * Printing IPv4-mapped addresses is done according to RFC 4291 [1]
     *
     *     "An alternative form that is sometimes more
     *     convenient when dealing with a mixed environment
     *     of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d,
     *     where the 'x's are the hexadecimal values of the
     *     six high-order 16-bit pieces of the address, and
     *     the 'd's are the decimal values of the four
     *     low-order 8-bit pieces of the address (standard
     *     IPv4 representation)."
     *
     * [1] https://tools.ietf.org/html/rfc4291#page-4
     */
    PRINTA("::FFFF:%u.%u.%u.%u", addr->u8[12], addr->u8[13], addr->u8[14], addr->u8[15]);
  } else {
    for(i = 0, f = 0; i < sizeof(uip_ipaddr_t); i += 2) {
      a = (addr->u8[i] << 8) + addr->u8[i + 1];
      if(a == 0 && f >= 0) {
        if(f++ == 0) {
          PRINTA("::");
        }
      } else {
        if(f > 0) {
          f = -1;
        } else if(i > 0) {
          PRINTA(":");
        }
        PRINTA("%x", a);
      }
	  }
  }
}
/*---------------------------------------------------------------------------*/