_dhcp6.c

This directory contains source code for tcpdump, a tool for network monitoring and data acquisition

/*
 * Copyright (C) 1998 and 1999 WIDE Project.
 * 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 project 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 PROJECT 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 PROJECT 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.
 */

#if 0
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.3 1999/12/22 06:27:20 itojun Exp $";
#endif

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <memory.h>

#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>

#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "interfac.h"
#include "a2name.h"
#include "dhcp6.h"
#include "dhcp6opt.h"

#ifdef USE_INET6

#if 0
  static void              dhcp6opttab_init   (void);
  static struct dhcp6_opt *dhcp6opttab_byname (char *);
#endif

static struct dhcp6_opt *dhcp6opttab_bycode (u_int);

static char tstr[] = " [|dhcp6]";

static struct dhcp6_opt dh6opttab[] = {
  /* IP Address Extension */
  { 1, OL6_N, "IP Address", OT6_NONE, },

  /* General Extension */
  { 2, 4, "Time Offset", OT6_NUM, },
  { 3, OL6_N, "IEEE 1003.1 POSIX Timezone", OT6_STR, },
  { 6, OL6_16N, "Domain Name Server", OT6_V6, },
  { 10, OL6_N, "Domain Name", OT6_STR, },

  /* Application and Service Parameters */
  { 16, OL6_N, "Directory Agent", OT6_NONE, },
  { 17, OL6_N, "Service Scope", OT6_NONE, },
  { 18, OL6_16N, "Network Time Protocol Servers", OT6_V6, },
  { 19, OL6_N, "NIS Domain", OT6_STR, },
  { 20, OL6_16N, "NIS Servers", OT6_V6, },
  { 21, OL6_N, "NIS+ Domain", OT6_STR, },
  { 22, OL6_16N, "NIS+ Servers", OT6_V6, },

  /* TCP Parameters */
  { 32, 4, "TCP Keepalive Interval", OT6_NUM, },

  /* DHCPv6 Extensions */
  { 40, 4, "Maximum DHCPv6 Message Size", OT6_NUM, },
  { 41, OL6_N, "DHCP Retransmission and Configuration Parameter", OT6_NONE, },
  { 48, OL6_N, "Platform Specific Information", OT6_NONE, },
  { 49, OL6_N, "Platform Class Identifier", OT6_STR, },
  { 64, OL6_N, "Class Identifier", OT6_STR, },
  { 66, 16, "Reconfigure Multicast Address", OT6_V6, },
  { 67, 16, "Renumber DHCPv6 Server Address", OT6_V6, },
  { 68, OL6_N, "DHCP Relay ICMP Error Message", OT6_NONE, },
  { 84, OL6_N, "Client-Server Authentication", OT6_NONE, },
  { 85, 4, "Client Key Selection", OT6_NUM, },

  /* End Extension */
  { 65536, OL6_Z, "End", OT6_NONE, },

  { 0 },
};

#if 0
static struct dhcp6_opt *dh6o_pad;
static struct dhcp6_opt *dh6o_end;

static void dhcp6opttab_init (void)
{
  dh6o_pad = dhcp6opttab_bycode (0);
  dh6o_end = dhcp6opttab_bycode (65536);
}

static struct dhcp6_opt *dhcp6opttab_byname (char *name)
{
  struct dhcp6_opt *p;

  for (p = dh6opttab; p->code; p++)
    if (!strcmp (name, p->name))
      return p;
  return NULL;
}
#endif

static struct dhcp6_opt *dhcp6opttab_bycode (u_int code)
{
  struct dhcp6_opt *p;

  for (p = dh6opttab; p->code; p++)
    if (p->code == code)
      return p;
  return NULL;
}

static void dhcp6ext_print (u_char * cp, u_char * ep)
{
  struct dhcp6_opt *p;
  u_int16_t code, len;
  char      buf[BUFSIZ];
  int       i;

  if (cp == ep)
     return;

  PUTCHAR (' ');
  while (cp < ep)
  {
    code = ntohs (*(u_int16_t *) & cp[0]);
    if (code != 65535)
      len = ntohs (*(u_int16_t *) & cp[2]);
    else
      len = 0;
    p = dhcp6opttab_bycode (code);
    if (p == NULL)
    {
      PRINTF ("(unknown, len=%d)", len);
      cp += len + 4;
      continue;
    }

    /* sanity check on length */
    switch (p->len)
    {
      case OL6_N:
           break;
      case OL6_16N:
           if (len % 16 != 0)
             goto trunc;
           break;
      case OL6_Z:
           if (len != 0)
             goto trunc;
           break;
      default:
           if (len != p->len)
             goto trunc;
           break;
    }
    if (cp + 4 + len > ep)
    {
      PRINTF ("[|%s]", p->name);
      return;
    }

    PRINTF ("(%s, ", p->name);
    switch (p->type)
    {
      case OT6_V6:
           for (i = 0; i < len; i += 16)
           {
             inet_ntop (AF_INET6, &cp[4 + i], buf, sizeof(buf));
             if (i != 0)
               PUTCHAR (',');
             PRINTF ("%s", buf);
           }
           break;
      case OT6_STR:
           memset (&buf, 0, sizeof(buf));
           strncpy (buf, &cp[4], len);
           PRINTF ("%s", buf);
           break;
      case OT6_NUM:
           PRINTF ("%d", (u_int32_t) ntohl (*(u_int32_t *) & cp[4]));
           break;
      default:
           for (i = 0; i < len; i++)
             PRINTF ("%02x", cp[4 + i] & 0xff);
    }
    PUTCHAR (')');
    cp += len + 4;
  }
  return;

trunc:
  PUTS ("[|dhcp6ext]");
}

/*
 * Print dhcp6 requests
 */
void dhcp6_print (const u_char * cp, u_int length, u_short sport, u_short dport)
{
  union dhcp6 *dh6;
  u_char      *ep;
  u_char      *extp;

  PUTS ("dhcp6");

  ep = (u_char *) snapend;

  dh6 = (union dhcp6 *) cp;
  TCHECK (dh6->dh6_msgtype);
  switch (dh6->dh6_msgtype)
  {
    case DH6_SOLICIT:
         if (vflag && TTEST (dh6->dh6_sol.dh6sol_relayaddr))
         {
           PUTS (" solicit(");
           if ((dh6->dh6_sol.dh6sol_flags & DH6SOL_CLOSE) != 0)
             PUTCHAR ('C');
           if (dh6->dh6_sol.dh6sol_flags != 0)
             PUTCHAR (' ');
           PRINTF ("cliaddr=%s", ip6addr_string (&dh6->dh6_sol.dh6sol_cliaddr));
           PRINTF (" relayaddr=%s", ip6addr_string (&dh6->dh6_sol.dh6sol_relayaddr));
           PUTCHAR (')');
         }
         else
           PUTS (" solicit");
         break;

    case DH6_ADVERT:
         if (!(vflag && TTEST (dh6->dh6_adv.dh6adv_serveraddr)))
         {
           PUTS (" advert");
           break;
         }
         PUTS (" advert(");
         if ((dh6->dh6_adv.dh6adv_flags & DH6ADV_SERVPRESENT) != 0)
           PUTCHAR ('S');
         if (dh6->dh6_adv.dh6adv_flags != 0)
           PUTCHAR (' ');
         PRINTF ("pref=%u", dh6->dh6_adv.dh6adv_pref);
         PRINTF (" cliaddr=%s", ip6addr_string (&dh6->dh6_adv.dh6adv_cliaddr));
         PRINTF (" relayaddr=%s", ip6addr_string (&dh6->dh6_adv.dh6adv_relayaddr));
         PRINTF (" servaddr=%s", ip6addr_string (&dh6->dh6_adv.dh6adv_serveraddr));
         extp = (u_char *) ((&dh6->dh6_adv) + 1);
         dhcp6ext_print (extp, ep);
         PUTCHAR (')');
         break;

    case DH6_REQUEST:
         if (!(vflag && TTEST (dh6->dh6_req.dh6req_relayaddr)))
         {
           PUTS (" request");
           break;
         }
         PUTS (" request(");
         if ((dh6->dh6_req.dh6req_flags & DH6REQ_CLOSE) != 0)
           PUTCHAR ('C');
         if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
           PUTS ("S");
         if ((dh6->dh6_req.dh6req_flags & DH6REQ_REBOOT) != 0)
           PUTCHAR ('R');
         if (dh6->dh6_req.dh6req_flags != 0)
           PUTCHAR (' ');
         PRINTF ("xid=0x%04x", dh6->dh6_req.dh6req_xid);
         PRINTF (" cliaddr=%s", ip6addr_string (&dh6->dh6_req.dh6req_cliaddr));
         PRINTF (" relayaddr=%s", ip6addr_string (&dh6->dh6_req.dh6req_relayaddr));
         extp = (char *) ((&dh6->dh6_req) + 1);
         if ((dh6->dh6_req.dh6req_flags & DH6REQ_SERVPRESENT) != 0)
         {
           PRINTF (" servaddr=%s", ip6addr_string (extp));
           extp += 16;
         }
         dhcp6ext_print (extp, ep);
         PUTCHAR (')');
         break;

    case DH6_REPLY:
         if (!(vflag && TTEST (dh6->dh6_rep.dh6rep_xid)))
         {
           PUTS (" reply");
           break;
         }
         PUTS (" reply(");
         if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
           PUTCHAR ('C');
         if (dh6->dh6_rep.dh6rep_flagandstat != 0)
           PUTCHAR (' ');
         PRINTF ("stat=0x%02x", dh6->dh6_rep.dh6rep_flagandstat & DH6REP_STATMASK);
         extp = (u_char *) ((&dh6->dh6_rep) + 1);
         if ((dh6->dh6_rep.dh6rep_flagandstat & DH6REP_CLIPRESENT) != 0)
         {
           PRINTF (" cliaddr=%s", ip6addr_string (extp));
           extp += 16;
         }
         dhcp6ext_print (extp, ep);
         PUTCHAR (')');
         break;

    case DH6_RELEASE:
         PUTS (" release");
         break;

    case DH6_RECONFIG:
         PUTS (" reconfig");
         break;
  }
  return;

trunc:
  PRINTF ("%s", tstr);
}
#endif