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wireshark/packet-rip.c

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/* packet-rip.c
* Routines for RIPv1 and RIPv2 packet disassembly
* RFC1058, RFC2453
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
*
* RFC2082 ( Keyed Message Digest Algorithm )
* Emanuele Caratti <wiz@iol.it>
*
* $Id: packet-rip.c,v 1.34 2003/10/18 18:46:37 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#define UDP_PORT_RIP 520
#define RIPv1 1
#define RIPv2 2
static const value_string version_vals[] = {
{ RIPv1, "RIPv1" },
{ RIPv2, "RIPv2" },
{ 0, NULL }
};
static const value_string command_vals[] = {
{ 1, "Request" },
{ 2, "Response" },
{ 3, "Traceon" },
{ 4, "Traceoff" },
{ 5, "Vendor specific (Sun)" },
{ 0, NULL }
};
#define AFVAL_UNSPEC 0
#define AFVAL_IP 2
static const value_string family_vals[] = {
{ AFVAL_UNSPEC, "Unspecified" },
{ AFVAL_IP, "IP" },
{ 0, NULL }
};
#define AUTH_IP_ROUTE 1
#define AUTH_PASSWORD 2
#define AUTH_KEYED_MSG_DIGEST 3
static const value_string rip_auth_type[] = {
{ AUTH_IP_ROUTE, "IP Route" },
{ AUTH_PASSWORD, "Simple Password" },
{ AUTH_KEYED_MSG_DIGEST, "Keyed Message Digest" },
{ 0, NULL }
};
#define RIP_HEADER_LENGTH 4
#define RIP_ENTRY_LENGTH 20
static int proto_rip = -1;
static int hf_rip_command = -1;
static int hf_rip_version = -1;
static int hf_rip_routing_domain = -1;
static int hf_rip_ip = -1;
static int hf_rip_netmask = -1;
static int hf_rip_next_hop = -1;
static int hf_rip_metric = -1;
static int hf_rip_auth = -1;
static int hf_rip_auth_passwd = -1;
static int hf_rip_family = -1;
static int hf_rip_route_tag = -1;
static gint ett_rip = -1;
static gint ett_rip_vec = -1;
static gint ett_auth_vec = -1;
static void dissect_unspec_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree);
static void dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree);
static gint dissect_rip_authentication(tvbuff_t *tvb, int offset,
proto_tree *tree);
static void
dissect_rip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
proto_tree *rip_tree = NULL;
proto_item *ti;
guint8 command;
guint8 version;
guint16 family;
gint trailer_len = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIP");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
command = tvb_get_guint8(tvb, 0);
version = tvb_get_guint8(tvb, 1);
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_add_str(pinfo->cinfo, COL_PROTOCOL,
val_to_str(version, version_vals, "RIP"));
if (check_col(pinfo->cinfo, COL_INFO))
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(command, command_vals, "Unknown command (%u)"));
if (tree) {
ti = proto_tree_add_item(tree, proto_rip, tvb, 0, -1, FALSE);
rip_tree = proto_item_add_subtree(ti, ett_rip);
proto_tree_add_uint(rip_tree, hf_rip_command, tvb, 0, 1, command);
proto_tree_add_uint(rip_tree, hf_rip_version, tvb, 1, 1, version);
if (version == RIPv2)
proto_tree_add_uint(rip_tree, hf_rip_routing_domain, tvb, 2, 2,
tvb_get_ntohs(tvb, 2));
/* skip header */
offset = RIP_HEADER_LENGTH;
/* zero or more entries */
while (tvb_reported_length_remaining(tvb, offset) > trailer_len ) {
family = tvb_get_ntohs(tvb, offset);
switch (family) {
case AFVAL_UNSPEC: /* Unspecified */
/*
* There should be one entry in the request, and a metric
* of infinity, meaning "show the entire routing table".
*/
dissect_unspec_rip_vektor(tvb, offset, version, rip_tree);
break;
case AFVAL_IP: /* IP */
dissect_ip_rip_vektor(tvb, offset, version, rip_tree);
break;
case 0xFFFF:
if( offset == RIP_HEADER_LENGTH ) {
trailer_len=dissect_rip_authentication(tvb, offset, rip_tree);
break;
}
/* Intentional fall through: auth Entry MUST be the first! */
default:
proto_tree_add_text(rip_tree, tvb, offset,
RIP_ENTRY_LENGTH, "Unknown address family %u",
family);
break;
}
offset += RIP_ENTRY_LENGTH;
}
}
}
static void
dissect_unspec_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree)
{
proto_item *ti;
proto_tree *rip_vektor_tree;
guint32 metric;
metric = tvb_get_ntohl(tvb, offset+16);
ti = proto_tree_add_text(tree, tvb, offset,
RIP_ENTRY_LENGTH, "Address not specified, Metric: %u",
metric);
rip_vektor_tree = proto_item_add_subtree(ti, ett_rip_vec);
proto_tree_add_item(rip_vektor_tree, hf_rip_family, tvb, offset, 2, FALSE);
if (version == RIPv2) {
proto_tree_add_item(rip_vektor_tree, hf_rip_route_tag, tvb, offset+2, 2,
FALSE);
proto_tree_add_item(rip_vektor_tree, hf_rip_netmask, tvb, offset+8, 4,
FALSE);
proto_tree_add_item(rip_vektor_tree, hf_rip_next_hop, tvb, offset+12, 4,
FALSE);
}
proto_tree_add_uint(rip_vektor_tree, hf_rip_metric, tvb,
offset+16, 4, metric);
}
static void
dissect_ip_rip_vektor(tvbuff_t *tvb, int offset, guint8 version,
proto_tree *tree)
{
proto_item *ti;
proto_tree *rip_vektor_tree;
guint32 metric;
metric = tvb_get_ntohl(tvb, offset+16);
ti = proto_tree_add_text(tree, tvb, offset,
RIP_ENTRY_LENGTH, "IP Address: %s, Metric: %u",
ip_to_str(tvb_get_ptr(tvb, offset+4, 4)), metric);
rip_vektor_tree = proto_item_add_subtree(ti, ett_rip_vec);
proto_tree_add_item(rip_vektor_tree, hf_rip_family, tvb, offset, 2, FALSE);
if (version == RIPv2) {
proto_tree_add_item(rip_vektor_tree, hf_rip_route_tag, tvb, offset+2, 2,
FALSE);
}
proto_tree_add_item(rip_vektor_tree, hf_rip_ip, tvb, offset+4, 4, FALSE);
if (version == RIPv2) {
proto_tree_add_item(rip_vektor_tree, hf_rip_netmask, tvb, offset+8, 4,
FALSE);
proto_tree_add_item(rip_vektor_tree, hf_rip_next_hop, tvb, offset+12, 4,
FALSE);
}
proto_tree_add_uint(rip_vektor_tree, hf_rip_metric, tvb,
offset+16, 4, metric);
}
static gchar *
rip_bytestring_to_str(const guint8 *ad, guint32 len, char punct) {
static gchar *str=NULL;
static guint str_len;
gchar *p;
int i;
guint32 octet;
/* At least one version of Apple's C compiler/linker is buggy, causing
a complaint from the linker about the "literal C string section"
not ending with '\0' if we initialize a 16-element "char" array with
a 16-character string, the fact that initializing such an array with
such a string is perfectly legitimate ANSI C nonwithstanding, the 17th
'\0' byte in the string nonwithstanding. */
static const gchar hex_digits[16] =
{ '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
if( !str ) {
str_len=sizeof(gchar)*len*(punct?3:2);
str=g_malloc(str_len);
} else {
if( str_len < (sizeof(gchar)*len*(punct?3:2)) ) {
g_free(str);
str_len=sizeof(gchar)*len*(punct?3:2);
str=g_malloc(str_len);
}
}
len--;
p = &str[str_len];
*--p = '\0';
i = len;
for (;;) {
octet = ad[i];
*--p = hex_digits[octet&0xF];
octet >>= 4;
*--p = hex_digits[octet&0xF];
if (i == 0)
break;
if (punct)
*--p = punct;
i--;
}
return p;
}
static gint
dissect_rip_authentication(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_item *ti;
proto_tree *rip_authentication_tree;
guint16 authtype;
guint32 val, digest_off, auth_data_len;
auth_data_len = 0;
authtype = tvb_get_ntohs(tvb, offset + 2);
ti = proto_tree_add_text(tree, tvb, offset, RIP_ENTRY_LENGTH,
"Authentication: %s", val_to_str( authtype, rip_auth_type, "Unknown (%u)" ) );
rip_authentication_tree = proto_item_add_subtree(ti, ett_rip_vec);
proto_tree_add_uint(rip_authentication_tree, hf_rip_auth, tvb, offset+2, 2,
authtype);
switch ( authtype ) {
case AUTH_PASSWORD: /* Plain text password */
proto_tree_add_item(rip_authentication_tree, hf_rip_auth_passwd,
tvb, offset+4, 16, FALSE);
break;
case AUTH_KEYED_MSG_DIGEST: /* Keyed MD5 rfc 2082 */
digest_off = tvb_get_ntohs( tvb, offset+4 );
proto_tree_add_text( rip_authentication_tree, tvb, offset+4, 2,
"Digest Offset: %u" , digest_off );
val = tvb_get_guint8( tvb, offset+6 );
proto_tree_add_text( rip_authentication_tree, tvb, offset+6, 1,
"Key ID: %u" , val );
auth_data_len = tvb_get_guint8( tvb, offset+7 );
proto_tree_add_text( rip_authentication_tree, tvb, offset+7, 1,
"Auth Data Len: %u" , auth_data_len );
val = tvb_get_ntohl( tvb, offset+8 );
proto_tree_add_text( rip_authentication_tree, tvb, offset+8, 4,
"Seq num: %u" , val );
proto_tree_add_text( rip_authentication_tree, tvb, offset+12, 8,
"Zero Padding" );
ti = proto_tree_add_text( rip_authentication_tree, tvb, offset-4+digest_off,
auth_data_len, "Authentication Data Trailer" );
rip_authentication_tree = proto_item_add_subtree(ti, ett_auth_vec );
proto_tree_add_text( rip_authentication_tree, tvb, offset-4+digest_off+4,
auth_data_len-4, "Authentication Data: %s",
rip_bytestring_to_str(
tvb_get_ptr( tvb, offset-4+digest_off+4,auth_data_len-4),
auth_data_len-4, ' '));
break;
}
return auth_data_len;
}
void
proto_register_rip(void)
{
static hf_register_info hf[] = {
{ &hf_rip_command,
{ "Command", "rip.command", FT_UINT8, BASE_DEC,
VALS(command_vals), 0, "What type of RIP Command is this", HFILL }},
{ &hf_rip_version,
{ "Version", "rip.version", FT_UINT8, BASE_DEC,
VALS(version_vals), 0, "Version of the RIP protocol", HFILL }},
{ &hf_rip_family,
{ "Address Family", "rip.family", FT_UINT16, BASE_DEC,
VALS(family_vals), 0, "Address family", HFILL }},
{ &hf_rip_routing_domain,
{ "Routing Domain", "rip.routing_domain", FT_UINT16, BASE_DEC,
NULL, 0, "RIPv2 Routing Domain", HFILL }},
{ &hf_rip_ip,
{ "IP Address", "rip.ip", FT_IPv4, BASE_NONE,
NULL, 0, "IP Address", HFILL}},
{ &hf_rip_netmask,
{ "Netmask", "rip.netmask", FT_IPv4, BASE_NONE,
NULL, 0, "Netmask", HFILL}},
{ &hf_rip_next_hop,
{ "Next Hop", "rip.next_hop", FT_IPv4, BASE_NONE,
NULL, 0, "Next Hop router for this route", HFILL}},
{ &hf_rip_metric,
{ "Metric", "rip.metric", FT_UINT16, BASE_DEC,
NULL, 0, "Metric for this route", HFILL }},
{ &hf_rip_auth,
{ "Authentication type", "rip.auth.type", FT_UINT16, BASE_DEC,
VALS(rip_auth_type), 0, "Type of authentication", HFILL }},
{ &hf_rip_auth_passwd,
{ "Password", "rip.auth.passwd", FT_STRING, BASE_DEC,
NULL, 0, "Authentication password", HFILL }},
{ &hf_rip_route_tag,
{ "Route Tag", "rip.route_tag", FT_UINT16, BASE_DEC,
NULL, 0, "Route Tag", HFILL }},
};
static gint *ett[] = {
&ett_rip,
&ett_rip_vec,
&ett_auth_vec,
};
proto_rip = proto_register_protocol("Routing Information Protocol",
"RIP", "rip");
proto_register_field_array(proto_rip, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_rip(void)
{
dissector_handle_t rip_handle;
rip_handle = create_dissector_handle(dissect_rip, proto_rip);
dissector_add("udp.port", UDP_PORT_RIP, rip_handle);
}
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