397 lines
14 KiB
C
397 lines
14 KiB
C
/* packet-rip.c
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* Routines for RIPv1 and RIPv2 packet disassembly
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* RFC1058 (STD 34), RFC1388, RFC1723, RFC2453 (STD 56)
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* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
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*
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* RFC2082 ( Keyed Message Digest Algorithm )
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* Emanuele Caratti <wiz@iol.it>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#include <epan/to_str.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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void proto_register_rip(void);
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void proto_reg_handoff_rip(void);
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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 AUTH_IP_ROUTE 1
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#define AUTH_PASSWORD 2
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#define AUTH_KEYED_MSG_DIGEST 3
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static const value_string rip_auth_type[] = {
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{ AUTH_IP_ROUTE, "IP Route" },
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{ AUTH_PASSWORD, "Simple Password" },
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{ AUTH_KEYED_MSG_DIGEST, "Keyed Message Digest" },
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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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#define MD5_AUTH_DATA_LEN 16
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static gboolean pref_display_routing_domain = FALSE;
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static dissector_handle_t rip_handle;
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static header_field_info *hfi_rip = NULL;
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#define RIP_HFI_INIT HFI_INIT(proto_rip)
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static header_field_info hfi_rip_command RIP_HFI_INIT = {
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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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static header_field_info hfi_rip_version RIP_HFI_INIT = {
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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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static header_field_info hfi_rip_routing_domain RIP_HFI_INIT = {
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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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static header_field_info hfi_rip_ip RIP_HFI_INIT = {
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"IP Address", "rip.ip", FT_IPv4, BASE_NONE,
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NULL, 0, NULL, HFILL};
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static header_field_info hfi_rip_netmask RIP_HFI_INIT = {
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"Netmask", "rip.netmask", FT_IPv4, BASE_NETMASK,
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NULL, 0, NULL, HFILL};
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static header_field_info hfi_rip_next_hop RIP_HFI_INIT = {
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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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static header_field_info hfi_rip_metric RIP_HFI_INIT = {
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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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static header_field_info hfi_rip_auth RIP_HFI_INIT = {
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"Authentication type", "rip.auth.type", FT_UINT16, BASE_DEC,
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VALS(rip_auth_type), 0, "Type of authentication", HFILL };
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static header_field_info hfi_rip_auth_passwd RIP_HFI_INIT = {
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"Password", "rip.auth.passwd", FT_STRING, BASE_NONE,
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NULL, 0, "Authentication password", HFILL };
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static header_field_info hfi_rip_family RIP_HFI_INIT = {
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"Address Family", "rip.family", FT_UINT16, BASE_DEC,
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VALS(family_vals), 0, NULL, HFILL };
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static header_field_info hfi_rip_route_tag RIP_HFI_INIT = {
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"Route Tag", "rip.route_tag", FT_UINT16, BASE_DEC,
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NULL, 0, NULL, HFILL };
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static header_field_info hfi_rip_zero_padding RIP_HFI_INIT = {
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"Zero adding", "rip.zero_padding", FT_STRING, BASE_NONE,
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NULL, 0, "Authentication password", HFILL };
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static header_field_info hfi_rip_digest_offset RIP_HFI_INIT = {
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"Digest Offset", "rip.digest_offset", FT_UINT16, BASE_DEC,
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NULL, 0, NULL, HFILL };
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static header_field_info hfi_rip_key_id RIP_HFI_INIT = {
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"Key ID", "rip.key_id", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL };
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static header_field_info hfi_rip_auth_data_len RIP_HFI_INIT = {
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"Auth Data Len", "rip.auth_data_len", FT_UINT8, BASE_DEC,
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NULL, 0, NULL, HFILL };
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static header_field_info hfi_rip_auth_seq_num RIP_HFI_INIT = {
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"Seq num", "rip.seq_num", FT_UINT32, BASE_DEC,
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NULL, 0, NULL, HFILL };
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static header_field_info hfi_rip_authentication_data RIP_HFI_INIT = {
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"Authentication Data", "rip.authentication_data", FT_BYTES, BASE_NONE,
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NULL, 0, NULL, HFILL };
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static gint ett_rip = -1;
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static gint ett_rip_vec = -1;
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static gint ett_auth_vec = -1;
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static expert_field ei_rip_unknown_address_family = EI_INIT;
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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 gint dissect_rip_authentication(tvbuff_t *tvb, int offset,
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proto_tree *tree);
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static int
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dissect_rip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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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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gint trailer_len = 0;
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gboolean is_md5_auth = FALSE;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIP");
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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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col_set_str(pinfo->cinfo, COL_PROTOCOL,
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val_to_str_const(version, version_vals, "RIP"));
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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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ti = proto_tree_add_item(tree, hfi_rip, tvb, 0, -1, ENC_NA);
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rip_tree = proto_item_add_subtree(ti, ett_rip);
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proto_tree_add_uint(rip_tree, &hfi_rip_command, tvb, 0, 1, command);
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proto_tree_add_uint(rip_tree, &hfi_rip_version, tvb, 1, 1, version);
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if (version == RIPv2 && pref_display_routing_domain == TRUE)
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proto_tree_add_item(rip_tree, &hfi_rip_routing_domain, tvb, 2, 2,
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ENC_BIG_ENDIAN);
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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) > trailer_len ) {
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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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if( offset == RIP_HEADER_LENGTH ) {
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trailer_len=dissect_rip_authentication(tvb, offset, rip_tree);
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is_md5_auth = TRUE;
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break;
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}
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if(is_md5_auth && tvb_reported_length_remaining(tvb, offset) == 20)
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break;
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/* Intentional fall through */ /* auth Entry MUST be the first! */
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default:
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proto_tree_add_expert_format(rip_tree, pinfo, &ei_rip_unknown_address_family, tvb, offset,
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RIP_ENTRY_LENGTH, "Unknown address family %u", 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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return tvb_captured_length(tvb);
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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_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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rip_vektor_tree = proto_tree_add_subtree_format(tree, tvb, offset,
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RIP_ENTRY_LENGTH, ett_rip_vec, NULL, "Address not specified, Metric: %u",
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metric);
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_family, tvb, offset, 2, ENC_BIG_ENDIAN);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_route_tag, tvb, offset+2, 2,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_netmask, tvb, offset+8, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_next_hop, tvb, offset+12, 4,
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ENC_BIG_ENDIAN);
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}
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proto_tree_add_uint(rip_vektor_tree, &hfi_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_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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rip_vektor_tree = proto_tree_add_subtree_format(tree, tvb, offset,
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RIP_ENTRY_LENGTH, ett_rip_vec, NULL, "IP Address: %s, Metric: %u",
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tvb_ip_to_str(tvb, offset+4), metric);
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_family, tvb, offset, 2, ENC_BIG_ENDIAN);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_route_tag, tvb, offset+2, 2,
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ENC_BIG_ENDIAN);
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}
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_ip, tvb, offset+4, 4, ENC_BIG_ENDIAN);
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if (version == RIPv2) {
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_netmask, tvb, offset+8, 4,
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ENC_BIG_ENDIAN);
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proto_tree_add_item(rip_vektor_tree, &hfi_rip_next_hop, tvb, offset+12, 4,
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ENC_BIG_ENDIAN);
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}
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proto_tree_add_uint(rip_vektor_tree, &hfi_rip_metric, tvb,
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offset+16, 4, metric);
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}
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static gint
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dissect_rip_authentication(tvbuff_t *tvb, int offset, proto_tree *tree)
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{
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proto_tree *rip_authentication_tree;
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guint16 authtype;
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guint32 digest_off, auth_data_len;
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auth_data_len = 0;
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authtype = tvb_get_ntohs(tvb, offset + 2);
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rip_authentication_tree = proto_tree_add_subtree_format(tree, tvb, offset, RIP_ENTRY_LENGTH,
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ett_rip_vec, NULL, "Authentication: %s", val_to_str( authtype, rip_auth_type, "Unknown (%u)" ) );
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proto_tree_add_uint(rip_authentication_tree, &hfi_rip_auth, tvb, offset+2, 2,
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authtype);
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switch ( authtype ) {
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case AUTH_PASSWORD: /* Plain text password */
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proto_tree_add_item(rip_authentication_tree, &hfi_rip_auth_passwd,
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tvb, offset+4, 16, ENC_ASCII|ENC_NA);
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break;
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case AUTH_KEYED_MSG_DIGEST: /* Keyed MD5 rfc 2082 */
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digest_off = tvb_get_ntohs( tvb, offset+4 );
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_digest_offset, tvb, offset+4, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_key_id, tvb, offset+6, 1, ENC_NA);
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auth_data_len = tvb_get_guint8( tvb, offset+7 );
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_auth_data_len, tvb, offset+7, 1, ENC_NA);
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_auth_seq_num, tvb, offset+8, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_zero_padding, tvb, offset+12, 8, ENC_NA);
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rip_authentication_tree = proto_tree_add_subtree( rip_authentication_tree, tvb, offset-4+digest_off,
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MD5_AUTH_DATA_LEN+4, ett_auth_vec, NULL, "Authentication Data Trailer" );
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proto_tree_add_item( rip_authentication_tree, &hfi_rip_authentication_data, tvb, offset-4+digest_off+4,
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MD5_AUTH_DATA_LEN, ENC_NA);
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break;
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}
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return auth_data_len;
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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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#ifndef HAVE_HFI_SECTION_INIT
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static header_field_info *hfi[] = {
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&hfi_rip_command,
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&hfi_rip_version,
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&hfi_rip_routing_domain,
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&hfi_rip_ip,
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&hfi_rip_netmask,
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&hfi_rip_next_hop,
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&hfi_rip_metric,
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&hfi_rip_auth,
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&hfi_rip_auth_passwd,
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&hfi_rip_family,
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&hfi_rip_route_tag,
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&hfi_rip_zero_padding,
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&hfi_rip_digest_offset,
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&hfi_rip_key_id,
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&hfi_rip_auth_data_len,
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&hfi_rip_auth_seq_num,
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&hfi_rip_authentication_data,
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};
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#endif /* HAVE_HFI_SECTION_INIT */
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static gint *ett[] = {
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&ett_rip,
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&ett_rip_vec,
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&ett_auth_vec,
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};
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static ei_register_info ei[] = {
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{ &ei_rip_unknown_address_family, { "rip.unknown_address_family", PI_PROTOCOL, PI_WARN, "Unknown address family", EXPFILL }},
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};
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expert_module_t* expert_rip;
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module_t *rip_module;
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int proto_rip;
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proto_rip = proto_register_protocol("Routing Information Protocol", "RIP", "rip");
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hfi_rip = proto_registrar_get_nth(proto_rip);
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proto_register_fields(proto_rip, hfi, array_length(hfi));
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proto_register_subtree_array(ett, array_length(ett));
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expert_rip = expert_register_protocol(proto_rip);
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expert_register_field_array(expert_rip, ei, array_length(ei));
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rip_module = prefs_register_protocol(proto_rip, NULL);
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prefs_register_bool_preference(rip_module, "display_routing_domain", "Display Routing Domain field", "Display the third and forth bytes of the RIPv2 header as the Routing Domain field (introduced in RFC 1388 [January 1993] and obsolete as of RFC 1723 [November 1994])", &pref_display_routing_domain);
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rip_handle = create_dissector_handle(dissect_rip, proto_rip);
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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_add_uint_with_preference("udp.port", UDP_PORT_RIP, rip_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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