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print-dhcp6.c

/*
 * 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.
 */
/*
 * RFC3315: DHCPv6
 * supported DHCPv6 options: 
 *  RFC3319,
 *  draft-ietf-dhc-dhcpv6-opt-dnsconfig-04.txt,
 *  draft-ietf-dhc-dhcpv6-opt-prefix-delegation-05.txt
 *  draft-ietf-dhc-dhcpv6-opt-timeconfig-02.txt,
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.27.2.4 2003/11/18 23:26:14 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

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

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

/* lease duration */
#define DHCP6_DURATITION_INFINITE 0xffffffff

/* Error Values */
#define DH6ERR_FAILURE        16
#define DH6ERR_AUTHFAIL       17
#define DH6ERR_POORLYFORMED   18
#define DH6ERR_UNAVAIL        19
#define DH6ERR_OPTUNAVAIL     20

/* Message type */
#define DH6_SOLICIT     1
#define DH6_ADVERTISE   2
#define DH6_REQUEST     3
#define DH6_CONFIRM     4
#define DH6_RENEW 5
#define DH6_REBIND      6
#define DH6_REPLY 7
#define DH6_RELEASE     8
#define DH6_DECLINE     9
#define DH6_RECONFIGURE 10
#define DH6_INFORM_REQ  11
#define DH6_RELAY_FORW  12
#define DH6_RELAY_REPLY 13

/* DHCP6 base packet format */
struct dhcp6 {
      union {
            u_int8_t m;
            u_int32_t x;
      } dh6_msgtypexid;
      /* options follow */
};
#define dh6_msgtype     dh6_msgtypexid.m
#define dh6_xid         dh6_msgtypexid.x
#define DH6_XIDMASK     0x00ffffff

/* DHCPv6 relay messages */
struct dhcp6_relay {
      u_int8_t dh6relay_msgtype;
      u_int8_t dh6relay_hcnt;
      u_int8_t dh6relay_linkaddr[16];     /* XXX: badly aligned */
      u_int8_t dh6relay_peeraddr[16];
      /* options follow */
};

/* options */
#define DH6OPT_CLIENTID 1
#define DH6OPT_SERVERID 2
#define DH6OPT_IA_NA 3
#define DH6OPT_IA_TMP 4
#define DH6OPT_IADDR 5
#define DH6OPT_ORO 6
#define DH6OPT_PREFERENCE 7
#  define DH6OPT_PREF_UNDEF -1
#  define DH6OPT_PREF_MAX 255
#define DH6OPT_ELAPSED_TIME 8
#define DH6OPT_RELAY_MSG 9
/*#define DH6OPT_SERVER_MSG 10 deprecated */
#define DH6OPT_AUTH 11
#define DH6OPT_UNICAST 12
#define DH6OPT_STATUS_CODE 13
#  define DH6OPT_STCODE_SUCCESS 0
#  define DH6OPT_STCODE_UNSPECFAIL 1
#  define DH6OPT_STCODE_NOADDRAVAIL 2
#  define DH6OPT_STCODE_NOBINDING 3
#  define DH6OPT_STCODE_NOTONLINK 4
#  define DH6OPT_STCODE_USEMULTICAST 5
#  define DH6OPT_STCODE_NOPREFIXAVAIL 6
#define DH6OPT_RAPID_COMMIT 14
#define DH6OPT_USER_CLASS 15
#define DH6OPT_VENDOR_CLASS 16
#define DH6OPT_VENDOR_OPTS 17
#define DH6OPT_INTERFACE_ID 18
#define DH6OPT_RECONF_MSG 19
#define DH6OPT_RECONF_ACCEPT 20
#define DH6OPT_SIP_SERVER_D 21
#define DH6OPT_SIP_SERVER_A 22
#define DH6OPT_DNS 23
#define DH6OPT_DNSNAME 24

/*
 * The option type has not been assigned for the following options.
 * We temporarily adopt values used in the service specification document
 * (200206xx version) by NTT Communications.
 * Note that we'll change the following definitions if different type values
 * are officially assigned.
 */
#define DH6OPT_PREFIX_DELEGATION 30
#define DH6OPT_PREFIX_INFORMATION 31
#define DH6OPT_PREFIX_REQUEST 32

/*
 * The followings are also unassigned numbers.
 * We temporarily use values as of KAME snap 20031013.
 */
#define DH6OPT_IA_PD 33
#define DH6OPT_IA_PD_PREFIX 34
#define DH6OPT_NTP_SERVERS 35

struct dhcp6opt {
      u_int16_t dh6opt_type;
      u_int16_t dh6opt_len;
      /* type-dependent data follows */
};

struct dhcp6_ia {
      u_int16_t dh6opt_ia_type;
      u_int16_t dh6opt_ia_len;
      u_int32_t dh6opt_ia_iaid;
      u_int32_t dh6opt_ia_t1;
      u_int32_t dh6opt_ia_t2;
};

struct dhcp6_ia_prefix {
      u_int16_t dh6opt_ia_prefix_type;
      u_int16_t dh6opt_ia_prefix_len;
      u_int32_t dh6opt_ia_prefix_pltime;
      u_int32_t dh6opt_ia_prefix_vltime;
      u_int8_t dh6opt_ia_prefix_plen;
      struct in6_addr dh6opt_ia_prefix_addr;
}  __attribute__ ((__packed__));

static const char *
dhcp6opt_name(int type)
{
      static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */

      if (type > 65535)
            return "INVALID option";

      switch(type) {
      case DH6OPT_CLIENTID:
            return "client ID";
      case DH6OPT_SERVERID:
            return "server ID";
      case DH6OPT_IA_NA:
            return "IA_NA";
      case DH6OPT_ORO:
            return "option request";
      case DH6OPT_PREFERENCE:
            return "preference";
      case DH6OPT_ELAPSED_TIME:
            return "elapsed time";
      case DH6OPT_RELAY_MSG:
            return "relay message";
      case DH6OPT_STATUS_CODE:
            return "status code";
      case DH6OPT_RAPID_COMMIT:
            return "rapid commit";
      case DH6OPT_INTERFACE_ID:
            return "interface ID";
      case DH6OPT_RECONF_MSG:
            return "reconfigure message";
      case DH6OPT_RECONF_ACCEPT:
            return "reconfigure accept";
      case DH6OPT_SIP_SERVER_D:
            return "SIP Servers Domain";
      case DH6OPT_SIP_SERVER_A:
            return "SIP Servers Address";
      case DH6OPT_DNS:
            return "DNS";
      case DH6OPT_PREFIX_DELEGATION:
            return "prefix delegation";
      case DH6OPT_PREFIX_INFORMATION:
            return "prefix information";
      case DH6OPT_IA_PD:
            return "IA_PD";
      case DH6OPT_IA_PD_PREFIX:
            return "IA_PD prefix";
      case DH6OPT_NTP_SERVERS:
            return "NTP Server";
      default:
            snprintf(genstr, sizeof(genstr), "opt_%d", type);
            return(genstr);
      }
}

static const char *
dhcp6stcode(int code)
{
      static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */

      if (code > 255)
            return "INVALID code";

      switch(code) {
      case DH6OPT_STCODE_SUCCESS:
            return "success";
      case DH6OPT_STCODE_UNSPECFAIL:
            return "unspec failure";
      case DH6OPT_STCODE_NOADDRAVAIL:
            return "no addresses";
      case DH6OPT_STCODE_NOBINDING:
            return "no binding";
      case DH6OPT_STCODE_NOTONLINK:
            return "not on-link";
      case DH6OPT_STCODE_USEMULTICAST:
            return "use multicast";
      case DH6OPT_STCODE_NOPREFIXAVAIL:
            return "no prefixes";
      default:
            snprintf(genstr, sizeof(genstr), "code%d", code);
            return(genstr);
      }
}

static void
dhcp6opt_print(const u_char *cp, const u_char *ep)
{
      struct dhcp6opt *dh6o;
      u_char *tp;
      size_t i;
      u_int16_t opttype;
      size_t optlen;
      u_int16_t val16;
      u_int32_t val32;
      struct in6_addr addr6;
      struct dhcp6_ia ia;
      struct dhcp6_ia_prefix ia_prefix;

      if (cp == ep)
            return;
      while (cp < ep) {
            if (ep < cp + sizeof(*dh6o))
                  goto trunc;
            dh6o = (struct dhcp6opt *)cp;
            optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
            if (ep < cp + sizeof(*dh6o) + optlen)
                  goto trunc;
            opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
            printf(" (%s", dhcp6opt_name(opttype));
            switch (opttype) {
            case DH6OPT_CLIENTID:
            case DH6OPT_SERVERID:
                  if (optlen < 2) {
                        /*(*/
                        printf(" ?)");
                        break;
                  }
                  tp = (u_char *)(dh6o + 1);
                  switch (EXTRACT_16BITS(tp)) {
                  case 1:
                        if (optlen >= 2 + 6) {
                              printf(" hwaddr/time type %u time %u ",
                                  EXTRACT_16BITS(&tp[2]),
                                  EXTRACT_32BITS(&tp[4]));
                              for (i = 8; i < optlen; i++)
                                    printf("%02x", tp[i]);
                              /*(*/
                              printf(")");
                        } else {
                              /*(*/
                              printf(" ?)");
                        }
                        break;
                  case 2:
                        if (optlen >= 2 + 8) {
                              printf(" vid ");
                              for (i = 2; i < 2 + 8; i++)
                                    printf("%02x", tp[i]);
                              /*(*/
                              printf(")");
                        } else {
                              /*(*/
                              printf(" ?)");
                        }
                        break;
                  case 3:
                        if (optlen >= 2 + 2) {
                              printf(" hwaddr type %u ",
                                  EXTRACT_16BITS(&tp[2]));
                              for (i = 4; i < optlen; i++)
                                    printf("%02x", tp[i]);
                              /*(*/
                              printf(")");
                        } else {
                              /*(*/
                              printf(" ?)");
                        }
                        break;
                  default:
                        printf(" type %d)", EXTRACT_16BITS(tp));
                        break;
                  }
                  break;
            case DH6OPT_ORO:
                  if (optlen % 2) {
                        printf(" ?)");
                        break;
                  }
                  tp = (u_char *)(dh6o + 1);
                  for (i = 0; i < optlen; i += 2) {
                        u_int16_t opt;

                        memcpy(&opt, &tp[i], sizeof(opt));
                        printf(" %s", dhcp6opt_name(ntohs(opt)));
                  }
                  printf(")");
                  break;
            case DH6OPT_PREFERENCE:
                  if (optlen != 1) {
                        printf(" ?)");
                        break;
                  }
                  printf(" %d)", *((u_char *)(dh6o + 1) + 1));
                  break;
            case DH6OPT_ELAPSED_TIME:
                  if (optlen != 2) {
                        printf(" ?)");
                        break;
                  }
                  memcpy(&val16, dh6o + 1, sizeof(val16));
                  val16 = ntohs(val16);
                  printf(" %d)", (int)val16);
                  break;
            case DH6OPT_RELAY_MSG:
                  printf(" (");
                  dhcp6_print((const u_char *)(dh6o + 1), optlen);
                  printf(")");
                  break;
            case DH6OPT_RAPID_COMMIT: /* nothing todo */
                  printf(")");
                  break;
            case DH6OPT_INTERFACE_ID:
                  /*
                   * Since we cannot predict the encoding, print hex dump
                   * at most 10 characters.
                   */
                  for (i = 0; i < optlen && i < 10; i++)
                        printf("%02x", ((u_char *)(dh6o + 1))[i]);
                  break;
            case DH6OPT_RECONF_MSG:
                  tp = (u_char *)(dh6o + 1);
                  switch (*tp) {
                  case DH6_RENEW:
                        printf(" for renew)");
                        break;
                  case DH6_INFORM_REQ:
                        printf(" for inf-req)");
                        break;
                  default:
                        printf(" for ?\?\?(%02x))", *tp);
                        break;
                  }
                  break;
            case DH6OPT_RECONF_ACCEPT: /* nothing todo */
                  printf(")");
                  break;
            case DH6OPT_SIP_SERVER_A:
            case DH6OPT_DNS:
            case DH6OPT_NTP_SERVERS:
                  if (optlen % 16) {
                        printf(" ?)");
                        break;
                  }
                  tp = (u_char *)(dh6o + 1);
                  for (i = 0; i < optlen; i += 16)
                        printf(" %s", ip6addr_string(&tp[i]));
                  printf(")");
                  break;
            case DH6OPT_PREFIX_DELEGATION:
                  dhcp6opt_print((u_char *)(dh6o + 1),
                      (u_char *)(dh6o + 1) + optlen);
                  printf(")");
                  break;
            case DH6OPT_PREFIX_INFORMATION:
                  if (optlen % 21)
                        printf(" ?)");
                  memcpy(&addr6, (u_char *)(dh6o + 1) + 5,
                      sizeof(addr6));
                  printf(" %s/%d", ip6addr_string(&addr6),
                      (int)*((u_char *)(dh6o + 1) + 4));
                  memcpy(&val32, dh6o + 1, sizeof(val32));
                  val32 = ntohl(val32);
                  if (val32 == DHCP6_DURATITION_INFINITE)
                        printf(" lease-duration: infinite)");
                  else
                        printf(" lease-duration: %u)", val32);
                  break;
            case DH6OPT_STATUS_CODE:
                  if (optlen < 2) {
                        printf(" ?)");
                        break;
                  }
                  memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
                  val16 = ntohs(val16);
                  printf(" %s)", dhcp6stcode(val16));
                  break;
            case DH6OPT_IA_NA:
            case DH6OPT_IA_PD:
                  if (optlen < sizeof(ia) - 4) {
                        printf(" ?)");
                        break;
                  }
                  memcpy(&ia, (u_char *)dh6o, sizeof(ia));
                  ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
                  ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
                  ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
                  printf(" IAID:%lu T1:%lu T2:%lu",
                      (unsigned long)ia.dh6opt_ia_iaid,
                      (unsigned long)ia.dh6opt_ia_t1,
                      (unsigned long)ia.dh6opt_ia_t2);
                  if (optlen > sizeof(ia) - 4) {
                        /* there are sub-options */
                        dhcp6opt_print((u_char *)dh6o + sizeof(ia),
                            (u_char *)(dh6o + 1) + optlen);
                  }
                  printf(")");
                  break;
            case DH6OPT_IA_PD_PREFIX:
                  if (optlen < sizeof(ia_prefix) - 4) {
                        printf(" ?)");
                        break;
                  }
                  memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
                  printf(" %s/%d",
                      ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
                      ia_prefix.dh6opt_ia_prefix_plen);
                  ia_prefix.dh6opt_ia_prefix_pltime =
                      ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
                  ia_prefix.dh6opt_ia_prefix_vltime =
                      ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
                  printf(" pltime:%lu vltime:%lu",
                      (unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
                      (unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
                  if (optlen > sizeof(ia_prefix) - 4) {
                        /* there are sub-options */
                        dhcp6opt_print((u_char *)dh6o +
                            sizeof(ia_prefix),
                            (u_char *)(dh6o + 1) + optlen);
                  }
                  printf(")");
                  break;
            default:
                  printf(")");
                  break;
            }

            cp += sizeof(*dh6o) + optlen;
      }
      return;

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

/*
 * Print dhcp6 packets
 */
void
dhcp6_print(const u_char *cp, u_int length)
{
      struct dhcp6 *dh6;
      struct dhcp6_relay *dh6relay;
      const u_char *ep;
      u_char *extp;
      const char *name;

      printf("dhcp6");

      ep = (u_char *)snapend;
      if (cp + length < ep)
            ep = cp + length;

      dh6 = (struct dhcp6 *)cp;
      dh6relay = (struct dhcp6_relay *)cp;
      TCHECK(dh6->dh6_xid);
      switch (dh6->dh6_msgtype) {
      case DH6_SOLICIT:
            name = "solicit";
            break;
      case DH6_ADVERTISE:
            name = "advertise";
            break;
      case DH6_REQUEST:
            name = "request";
            break;
      case DH6_CONFIRM:
            name = "confirm";
            break;
      case DH6_RENEW:
            name = "renew";
            break;
      case DH6_REBIND:
            name = "rebind";
            break;
      case DH6_REPLY:
            name = "reply";
            break;
      case DH6_RELEASE:
            name = "release";
            break;
      case DH6_DECLINE:
            name = "decline";
            break;
      case DH6_RECONFIGURE:
            name = "reconfigure";
            break;
      case DH6_INFORM_REQ:
            name= "inf-req";
            break;
      case DH6_RELAY_FORW:
            name= "relay-fwd";
            break;
      case DH6_RELAY_REPLY:
            name= "relay-reply";
            break;
      default:
            name = NULL;
            break;
      }

      if (!vflag) {
            if (name)
                  printf(" %s", name);
            else if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
                dh6->dh6_msgtype != DH6_RELAY_REPLY) {
                  printf(" msgtype-%u", dh6->dh6_msgtype);
            }
            return;
      }

      /* XXX relay agent messages have to be handled differently */

      if (name)
            printf(" %s (", name);  /*)*/
      else
            printf(" msgtype-%u (", dh6->dh6_msgtype);      /*)*/
      if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
          dh6->dh6_msgtype != DH6_RELAY_REPLY) {
            printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
            extp = (u_char *)(dh6 + 1);
            dhcp6opt_print(extp, ep);
      } else {          /* relay messages */
            struct in6_addr addr6;

            TCHECK(dh6relay->dh6relay_peeraddr);

            memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
            printf("linkaddr=%s", ip6addr_string(&addr6));

            memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
            printf(" peeraddr=%s", ip6addr_string(&addr6));

            dhcp6opt_print((u_char *)(dh6relay + 1), ep);
      }
      /*(*/
      printf(")");
      return;

trunc:
      printf("[|dhcp6]");
}

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