forked from osmocom/wireshark
302 lines
8.7 KiB
C
302 lines
8.7 KiB
C
/* packet-rip.c
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* Routines for RIPv1 and RIPv2 packet disassembly
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* RFC1058, RFC2453
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* $Id: packet-rip.c,v 1.33 2002/08/28 21:00:29 jmayer 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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* 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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#include "config.h"
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#define UDP_PORT_RIP 520
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#define RIPv1 1
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#define RIPv2 2
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static const value_string version_vals[] = {
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{ RIPv1, "RIPv1" },
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{ RIPv2, "RIPv2" },
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{ 0, NULL }
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};
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static const value_string command_vals[] = {
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{ 1, "Request" },
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{ 2, "Response" },
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{ 3, "Traceon" },
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{ 4, "Traceoff" },
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{ 5, "Vendor specific (Sun)" },
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{ 0, NULL }
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};
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#define AFVAL_UNSPEC 0
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#define AFVAL_IP 2
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static const value_string family_vals[] = {
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{ AFVAL_UNSPEC, "Unspecified" },
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{ AFVAL_IP, "IP" },
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{ 0, NULL }
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};
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#define RIP_HEADER_LENGTH 4
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#define RIP_ENTRY_LENGTH 20
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static int proto_rip = -1;
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static int hf_rip_command = -1;
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static int hf_rip_version = -1;
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static int hf_rip_routing_domain = -1;
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static int hf_rip_ip = -1;
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static int hf_rip_netmask = -1;
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static int hf_rip_next_hop = -1;
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static int hf_rip_metric = -1;
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static int hf_rip_auth = -1;
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static int hf_rip_auth_passwd = -1;
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static int hf_rip_family = -1;
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static int hf_rip_route_tag = -1;
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static gint ett_rip = -1;
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static gint ett_rip_vec = -1;
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static void dissect_unspec_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
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proto_tree *tree);
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static void dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
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proto_tree *tree);
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static void dissect_rip_authentication(tvbuff_t *tvb, int offset,
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proto_tree *tree);
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static void
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dissect_rip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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proto_tree *rip_tree = NULL;
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proto_item *ti;
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guint8 command;
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guint8 version;
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guint16 family;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIP");
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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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command = tvb_get_guint8(tvb, 0);
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version = tvb_get_guint8(tvb, 1);
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_add_str(pinfo->cinfo, COL_PROTOCOL,
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val_to_str(version, version_vals, "RIP"));
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(command, command_vals, "Unknown command (%u)"));
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if (tree) {
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ti = proto_tree_add_item(tree, proto_rip, tvb, 0, -1, FALSE);
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rip_tree = proto_item_add_subtree(ti, ett_rip);
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proto_tree_add_uint(rip_tree, hf_rip_command, tvb, 0, 1, command);
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proto_tree_add_uint(rip_tree, hf_rip_version, tvb, 1, 1, version);
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if (version == RIPv2)
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proto_tree_add_uint(rip_tree, hf_rip_routing_domain, tvb, 2, 2,
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tvb_get_ntohs(tvb, 2));
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/* skip header */
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offset = RIP_HEADER_LENGTH;
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/* zero or more entries */
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while (tvb_reported_length_remaining(tvb, offset) > 0) {
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family = tvb_get_ntohs(tvb, offset);
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switch (family) {
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case AFVAL_UNSPEC: /* Unspecified */
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/*
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* There should be one entry in the request, and a metric
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* of infinity, meaning "show the entire routing table".
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*/
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dissect_unspec_rip_vektor(tvb, offset, version, rip_tree);
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break;
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case AFVAL_IP: /* IP */
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dissect_ip_rip_vektor(tvb, offset, version, rip_tree);
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break;
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case 0xFFFF:
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dissect_rip_authentication(tvb, offset, rip_tree);
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break;
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default:
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proto_tree_add_text(rip_tree, tvb, offset,
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RIP_ENTRY_LENGTH, "Unknown address family %u",
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family);
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break;
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}
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offset += RIP_ENTRY_LENGTH;
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}
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}
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}
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static void
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dissect_unspec_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
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proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *rip_vektor_tree;
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guint32 metric;
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metric = tvb_get_ntohl(tvb, offset+16);
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ti = proto_tree_add_text(tree, tvb, offset,
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RIP_ENTRY_LENGTH, "Address not specified, Metric: %u",
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metric);
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rip_vektor_tree = proto_item_add_subtree(ti, ett_rip_vec);
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proto_tree_add_item(rip_vektor_tree, hf_rip_family, tvb, offset, 2, FALSE);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, hf_rip_route_tag, tvb, offset+2, 2,
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FALSE);
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proto_tree_add_item(rip_vektor_tree, hf_rip_netmask, tvb, offset+8, 4,
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FALSE);
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proto_tree_add_item(rip_vektor_tree, hf_rip_next_hop, tvb, offset+12, 4,
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FALSE);
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}
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proto_tree_add_uint(rip_vektor_tree, hf_rip_metric, tvb,
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offset+16, 4, metric);
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}
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static void
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dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
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proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *rip_vektor_tree;
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guint32 metric;
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metric = tvb_get_ntohl(tvb, offset+16);
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ti = proto_tree_add_text(tree, tvb, offset,
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RIP_ENTRY_LENGTH, "IP Address: %s, Metric: %u",
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ip_to_str(tvb_get_ptr(tvb, offset+4, 4)), metric);
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rip_vektor_tree = proto_item_add_subtree(ti, ett_rip_vec);
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proto_tree_add_item(rip_vektor_tree, hf_rip_family, tvb, offset, 2, FALSE);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, hf_rip_route_tag, tvb, offset+2, 2,
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FALSE);
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}
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proto_tree_add_item(rip_vektor_tree, hf_rip_ip, tvb, offset+4, 4, FALSE);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, hf_rip_netmask, tvb, offset+8, 4,
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FALSE);
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proto_tree_add_item(rip_vektor_tree, hf_rip_next_hop, tvb, offset+12, 4,
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FALSE);
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}
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proto_tree_add_uint(rip_vektor_tree, hf_rip_metric, tvb,
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offset+16, 4, metric);
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}
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static void
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dissect_rip_authentication(tvbuff_t *tvb, int offset, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *rip_authentication_tree;
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guint16 authtype;
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ti = proto_tree_add_text(tree, tvb, offset, RIP_ENTRY_LENGTH,
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"Authentication");
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rip_authentication_tree = proto_item_add_subtree(ti, ett_rip_vec);
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authtype = tvb_get_ntohs(tvb, offset + 2);
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proto_tree_add_uint(rip_authentication_tree, hf_rip_auth, tvb, offset+2, 2,
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authtype);
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if (authtype == 2) {
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proto_tree_add_item(rip_authentication_tree, hf_rip_auth_passwd,
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tvb, offset+4, 16, FALSE);
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}
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}
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void
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proto_register_rip(void)
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{
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static hf_register_info hf[] = {
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{ &hf_rip_command,
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{ "Command", "rip.command", FT_UINT8, BASE_DEC,
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VALS(command_vals), 0, "What type of RIP Command is this", HFILL }},
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{ &hf_rip_version,
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{ "Version", "rip.version", FT_UINT8, BASE_DEC,
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VALS(version_vals), 0, "Version of the RIP protocol", HFILL }},
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{ &hf_rip_family,
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{ "Address Family", "rip.family", FT_UINT16, BASE_DEC,
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VALS(family_vals), 0, "Address family", HFILL }},
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{ &hf_rip_routing_domain,
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{ "Routing Domain", "rip.routing_domain", FT_UINT16, BASE_DEC,
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NULL, 0, "RIPv2 Routing Domain", HFILL }},
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{ &hf_rip_ip,
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{ "IP Address", "rip.ip", FT_IPv4, BASE_NONE,
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NULL, 0, "IP Address", HFILL}},
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{ &hf_rip_netmask,
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{ "Netmask", "rip.netmask", FT_IPv4, BASE_NONE,
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NULL, 0, "Netmask", HFILL}},
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{ &hf_rip_next_hop,
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{ "Next Hop", "rip.next_hop", FT_IPv4, BASE_NONE,
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NULL, 0, "Next Hop router for this route", HFILL}},
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{ &hf_rip_metric,
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{ "Metric", "rip.metric", FT_UINT16, BASE_DEC,
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NULL, 0, "Metric for this route", HFILL }},
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{ &hf_rip_auth,
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{ "Authentication type", "rip.auth.type", FT_UINT16, BASE_DEC,
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NULL, 0, "Type of authentication", HFILL }},
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{ &hf_rip_auth_passwd,
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{ "Password", "rip.auth.passwd", FT_STRING, BASE_DEC,
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NULL, 0, "Authentication password", HFILL }},
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{ &hf_rip_route_tag,
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{ "Route Tag", "rip.route_tag", FT_UINT16, BASE_DEC,
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NULL, 0, "Route Tag", HFILL }},
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};
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static gint *ett[] = {
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&ett_rip,
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&ett_rip_vec,
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};
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proto_rip = proto_register_protocol("Routing Information Protocol",
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"RIP", "rip");
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proto_register_field_array(proto_rip, 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_rip(void)
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{
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dissector_handle_t rip_handle;
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rip_handle = create_dissector_handle(dissect_rip, proto_rip);
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dissector_add("udp.port", UDP_PORT_RIP, rip_handle);
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}
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