forked from osmocom/wireshark
DHCPv6 dissector, based on draft-ietf-dhc-dhcpv6-22.txt.
note that protocol constants are subject to change. (packet format is also subject to change. but 22 draft should go to wg last call very soon, and I really hope it to be the final one...) svn path=/trunk/; revision=4504
This commit is contained in:
Jun-ichiro itojun Hagino
parent
5e7698f322
commit
7cfaf110e6
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@ -1,7 +1,7 @@
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# Makefile.am
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# Automake file for Ethereal
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#
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# $Id: Makefile.am,v 1.402 2001/12/27 05:24:20 ashokn Exp $
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# $Id: Makefile.am,v 1.403 2002/01/09 02:51:46 itojun Exp $
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#
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# Ethereal - Network traffic analyzer
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# By Gerald Combs <gerald@ethereal.com>
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@ -113,6 +113,7 @@ DISSECTOR_SRC = \
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packet-dcerpc-wkssvc.c \
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packet-ddtp.c \
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packet-dec-bpdu.c \
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packet-dhcpv6.c \
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packet-diameter.c \
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packet-dlsw.c \
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packet-dns.c \
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@ -0,0 +1,268 @@
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/* packet-dhpcv6.c
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* Routines for DHCPv6 packet disassembly
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* Jun-ichiro itojun Hagino <itojun@iijlab.net>
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*
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* $Id: packet-dhcpv6.c,v 1.1 2002/01/09 02:51:46 itojun Exp $
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*
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* The information used comes from:
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* draft-ietf-dhc-dhcpv6-22.txt
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* Note that protocol constants are still subject to change, based on IANA
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* assignment decisions.
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <string.h>
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#include <glib.h>
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#include "int-64bit.h"
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#include "packet.h"
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#include "ipv6-utils.h"
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static int proto_dhcpv6 = -1;
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static int hf_dhcpv6_msgtype = -1;
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static guint ett_dhcpv6 = -1;
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static guint ett_dhcpv6_option = -1;
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#define UDP_PORT_DHCPV6_DOWNSTREAM 546
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#define UDP_PORT_DHCPV6_UPSTREAM 547
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static const value_string msgtype_vals[] = {
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{ 7, "Reply" },
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{ 11, "Information request" },
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{ 0, NULL }
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};
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static const value_string opttype_vals[] = {
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{ 1, "DUID" },
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{ 11, "DNS servers address" },
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{ 0, NULL }
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};
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/* Returns the number of bytes consumed by this option. */
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static int
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dhcpv6_option(tvbuff_t *tvb, proto_tree *bp_tree, int off, int eoff,
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gboolean *at_end)
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{
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guint16 opttype;
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guint16 optlen;
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proto_item *ti;
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proto_tree *subtree;
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int i;
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struct e_in6_addr in6;
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guint16 duidtype;
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/* option type and length must be present */
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if (eoff - off < 4) {
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*at_end = TRUE;
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return 0;
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}
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opttype = tvb_get_ntohs(tvb, off);
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optlen = tvb_get_ntohs(tvb, off + 2);
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/* truncated case */
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if (eoff - off < 4 + optlen) {
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*at_end = TRUE;
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return 0;
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}
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ti = proto_tree_add_text(bp_tree, tvb, off, 4 + optlen,
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"%s", val_to_str(opttype, opttype_vals, "DHCP option %u"));
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subtree = proto_item_add_subtree(ti, ett_dhcpv6_option);
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proto_tree_add_text(subtree, tvb, off, 2, "option type: %d", opttype);
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proto_tree_add_text(subtree, tvb, off + 2, 2, "option length: %d",
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optlen);
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off += 4;
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switch (opttype) {
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case 1: /* DUID */
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if (optlen < 2) {
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proto_tree_add_text(subtree, tvb, off, optlen,
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"DUID: malformed option");
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break;
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}
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duidtype = tvb_get_ntohs(tvb, off);
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proto_tree_add_text(subtree, tvb, off, 2,
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"DUID type: %u", duidtype);
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switch (duidtype) {
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case 1:
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if (optlen < 8) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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/* XXX seconds since Jan 1 2000 */
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proto_tree_add_text(subtree, tvb, off + 2, 4,
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"Time: %u", tvb_get_ntohl(tvb, off + 6));
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proto_tree_add_text(subtree, tvb, off + 6, 2,
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"Hardware type: %u",
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tvb_get_ntohs(tvb, off + 6));
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if (optlen > 8) {
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proto_tree_add_text(subtree, tvb, off + 8,
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optlen - 8, "Link-layer address");
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}
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break;
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case 2:
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if (optlen < 10) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off + 2, 8, "VUID");
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if (optlen > 10) {
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proto_tree_add_text(subtree, tvb, off + 10,
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optlen - 10, "Domain name");
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}
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break;
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case 3:
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if (optlen < 4) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off + 2, 2,
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"Hardware type: %u",
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tvb_get_ntohs(tvb, off + 10));
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if (optlen > 4) {
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proto_tree_add_text(subtree, tvb, off + 4,
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optlen - 4, "Link-layer address");
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}
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break;
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}
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break;
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case 11: /* DNS servers address */
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if (optlen % 16) {
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proto_tree_add_text(subtree, tvb, off, optlen,
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"DNS servers address: malformed option");
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break;
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}
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for (i = 0; i < optlen; i += 16) {
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tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6));
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proto_tree_add_text(subtree, tvb, off + i,
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sizeof(in6), "DNS servers address: %s",
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ip6_to_str(&in6));
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}
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break;
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}
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return 4 + optlen;
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}
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static void
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dissect_dhcpv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int downstream)
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{
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proto_tree *bp_tree = NULL;
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proto_item *ti;
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guint8 msgtype;
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guint32 xid;
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struct e_in6_addr in6;
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int off, eoff;
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gboolean at_end;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPv6");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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msgtype = tvb_get_guint8(tvb, 0);
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/* XXX relay agent messages have to be decoded differently */
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xid = tvb_get_ntohl(tvb, 0) & 0x00ffffff;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_set_str(pinfo->cinfo, COL_INFO,
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downstream ? "DHCPv6 reply" : "DHCPv6 request");
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_dhcpv6, tvb, 0,
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tvb_length(tvb), FALSE);
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bp_tree = proto_item_add_subtree(ti, ett_dhcpv6);
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proto_tree_add_uint(bp_tree, hf_dhcpv6_msgtype, tvb, 0, 1,
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msgtype);
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proto_tree_add_text(bp_tree, tvb, 1, 3, "XID: 0x%08x", xid);
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tvb_memcpy(tvb, (guint8 *)&in6, 4, sizeof(in6));
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proto_tree_add_text(bp_tree, tvb, 4, sizeof(in6),
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"Server address: %s", ip6_to_str(&in6));
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}
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off = 20;
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eoff = tvb_reported_length(tvb);
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at_end = FALSE;
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while (off < eoff && !at_end)
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off += dhcpv6_option(tvb, bp_tree, off, eoff, &at_end);
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}
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static void
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dissect_dhcpv6_downstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return dissect_dhcpv6(tvb, pinfo, tree, 1);
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}
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static void
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dissect_dhcpv6_upstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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return dissect_dhcpv6(tvb, pinfo, tree, 0);
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}
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void
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proto_register_dhcpv6(void)
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{
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static hf_register_info hf[] = {
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{ &hf_dhcpv6_msgtype,
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{ "Message type", "dhcpv6.msgtype", FT_UINT8,
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BASE_DEC, VALS(msgtype_vals), 0x0,
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"", HFILL }},
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};
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static gint *ett[] = {
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&ett_dhcpv6,
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&ett_dhcpv6_option,
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};
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proto_dhcpv6 = proto_register_protocol("DHCPv6", "DHCPv6", "dhcpv6");
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proto_register_field_array(proto_dhcpv6, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_dhcpv6(void)
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{
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dissector_handle_t dhcpv6_handle;
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dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_downstream,
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proto_dhcpv6);
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dissector_add("udp.port", UDP_PORT_DHCPV6_DOWNSTREAM, dhcpv6_handle);
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dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_upstream,
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proto_dhcpv6);
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dissector_add("udp.port", UDP_PORT_DHCPV6_UPSTREAM, dhcpv6_handle);
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}
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