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wireshark/packet-ospf.c

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/* packet-ospf.c
* Routines for OSPF packet disassembly
* (c) Copyright Hannes R. Boehm <hannes@boehm.org>
*
* $Id: packet-ospf.c,v 1.2 1998/09/16 03:22:08 gerald Exp $
*
* At this time, this module is able to analyze OSPF
* packets as specified in RFC2328. MOSPF (RFC1584) and other
* OSPF Extensions which introduce new Packet types
* (e.g the External Atributes LSA) are not supported.
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gtk/gtk.h>
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include "ethereal.h"
#include "packet.h"
#include "packet-ospf.h"
void
dissect_ospf(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospfhdr *ospfh;
GtkWidget *ospf_tree = NULL, *ti;
GtkWidget *ospf_header_tree;
char auth_data[9]="";
char *packet_type;
ospfh = (e_ospfhdr *) &pd[offset];
switch(ospfh->packet_type) {
case OSPF_HELLO:
packet_type="Hello Packet";
break;
case OSPF_DB_DESC:
packet_type="DB Descr.";
break;
case OSPF_LS_REQ:
packet_type="LS Request";
break;
case OSPF_LS_UPD:
packet_type="LS Update";
break;
case OSPF_LS_ACK:
packet_type="LS Acknowledge";
break;
default:
}
if (fd->win_info[0]) {
strcpy(fd->win_info[3], "OSPF");
sprintf(fd->win_info[4], "%s", packet_type);
}
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, ntohs(ospfh->length), "Open Shortest Path First");
ospf_tree = gtk_tree_new();
add_subtree(ti, ospf_tree, ETT_OSPF);
ti = add_item_to_tree(GTK_WIDGET(ospf_tree), offset, OSPF_HEADER_LENGTH, "OSPF Header");
ospf_header_tree = gtk_tree_new();
add_subtree(ti, ospf_header_tree, ETT_OSPF_HDR);
add_item_to_tree(ospf_header_tree, offset, 1, "OSPF Version: %d", ospfh->version);
add_item_to_tree(ospf_header_tree, offset + 1 , 1, "OSPF Packet Type: %d (%s)",
ospfh->packet_type, packet_type);
add_item_to_tree(ospf_header_tree, offset + 2 , 2, "Packet Legth: %d",
ntohs(ospfh->length));
add_item_to_tree(ospf_header_tree, offset + 4 , 4, "Source OSPF Router ID: %s",
ip_to_str((guint8 *) &(ospfh->routerid)));
if (!(ospfh->area)) {
add_item_to_tree(ospf_header_tree, offset + 8 , 4, "Area ID: Backbone");
} else {
add_item_to_tree(ospf_header_tree, offset + 8 , 4, "Area ID: %s", ip_to_str((guint8 *) &(ospfh->area)));
}
add_item_to_tree(ospf_header_tree, offset + 12 , 2, "Packet Checksum");
switch( ntohs(ospfh->auth_type) ) {
case OSPF_AUTH_NONE:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: none");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (none)");
break;
case OSPF_AUTH_SIMPLE:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: simple");
strncpy(auth_data, &(ospfh->auth_data), 8);
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data: %s", auth_data);
break;
case OSPF_AUTH_CRYPT:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type: crypt");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (crypt)");
break;
default:
add_item_to_tree(ospf_header_tree, offset + 14 , 2, "Auth Type (unknown)");
add_item_to_tree(ospf_header_tree, offset + 16 , 8, "Auth Data (unknown)");
}
}
/* Skip over header */
offset += OSPF_HEADER_LENGTH;
switch(ospfh->packet_type){
case OSPF_HELLO:
dissect_ospf_hello(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_DB_DESC:
dissect_ospf_db_desc(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_REQ:
dissect_ospf_ls_req(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_UPD:
dissect_ospf_ls_upd(pd, offset, fd, (GtkTree *) ospf_tree);
break;
case OSPF_LS_ACK:
dissect_ospf_ls_ack(pd, offset, fd, (GtkTree *) ospf_tree);
break;
default:
dissect_data(pd, offset, fd, tree);
}
}
void
dissect_ospf_hello(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_hello *ospfhello;
guint32 *ospfneighbor;
char options[20]="";
int options_offset;
GtkWidget *ospf_hello_tree, *ti;
ospfhello = (e_ospf_hello *) &pd[offset];
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "OSPF Hello Packet");
ospf_hello_tree = gtk_tree_new();
add_subtree(ti, ospf_hello_tree, ETT_OSPF_HELLO);
add_item_to_tree(ospf_hello_tree, offset , 4, "Network Mask: %s", ip_to_str((guint8 *) &ospfhello->network_mask));
add_item_to_tree(ospf_hello_tree, offset + 4, 2, "Hello Intervall: %d seconds", ntohs(ospfhello->hellointervall));
/* ATTENTION !!! no check for length of options string */
options_offset=0;
if(( ospfhello->options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
strcpy( (char *)(options + options_offset), "E");
options_offset+=1;
}
if(( ospfhello->options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
strcpy((char *) (options + options_offset), "/MC");
options_offset+=3;
}
if(( ospfhello->options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
strcpy((char *) (options + options_offset), "/NP");
options_offset+=3;
}
if(( ospfhello->options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
strcpy((char *) (options + options_offset) , "/EA");
options_offset+=3;
}
if(( ospfhello->options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
strcpy((char *) (options + options_offset) , "/DC");
options_offset+=3;
}
add_item_to_tree(ospf_hello_tree, offset + 6, 1, "Options: %d (%s)", ospfhello->options, options);
add_item_to_tree(ospf_hello_tree, offset + 7, 1, "Router Priority: %d", ospfhello->priority);
add_item_to_tree(ospf_hello_tree, offset + 8, 4, "RouterDeadIntervall: %d seconds", ntohl(ospfhello->dead_interval));
add_item_to_tree(ospf_hello_tree, offset + 12, 4, "Designated Router: %s", ip_to_str((guint8 *) &ospfhello->drouter));
add_item_to_tree(ospf_hello_tree, offset + 16, 4, "Backup Designated Router: %s", ip_to_str((guint8 *) &ospfhello->bdrouter));
offset+=20;
while(((int)(fd->cap_len - offset)) >= 4){
printf("%d", fd->cap_len - offset);
ospfneighbor=(guint32 *) &pd[offset];
add_item_to_tree(ospf_hello_tree, offset, 4, "Active Neighbor: %s", ip_to_str((guint8 *) ospfneighbor));
offset+=4;
}
}
}
void
dissect_ospf_db_desc(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_dbd *ospf_dbd;
char options[20]="";
int options_offset;
char flags[20]="";
int flags_offset;
GtkWidget *ospf_db_desc_tree=NULL, *ti;
ospf_dbd = (e_ospf_dbd *) &pd[offset];
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "OSPF DB Description");
ospf_db_desc_tree = gtk_tree_new();
add_subtree(ti, ospf_db_desc_tree, ETT_OSPF_DESC);
add_item_to_tree(ospf_db_desc_tree, offset, 2, "Interface MTU: %d", ntohs(ospf_dbd->interface_mtu) );
options_offset=0;
if(( ospf_dbd->options & OSPF_OPTIONS_E ) == OSPF_OPTIONS_E){
strcpy( (char *)(options + options_offset), "_E_");
options_offset+=1;
}
if(( ospf_dbd->options & OSPF_OPTIONS_MC ) == OSPF_OPTIONS_MC){
strcpy((char *) (options + options_offset), "_MC_");
options_offset+=3;
}
if(( ospf_dbd->options & OSPF_OPTIONS_NP ) == OSPF_OPTIONS_NP){
strcpy((char *) (options + options_offset), "_NP_");
options_offset+=3;
}
if(( ospf_dbd->options & OSPF_OPTIONS_EA ) == OSPF_OPTIONS_EA){
strcpy((char *) (options + options_offset) , "_EA_");
options_offset+=3;
}
if(( ospf_dbd->options & OSPF_OPTIONS_DC ) == OSPF_OPTIONS_DC){
strcpy((char *) (options + options_offset) , "_DC_");
options_offset+=3;
}
add_item_to_tree(ospf_db_desc_tree, offset + 2 , 1, "Options: %d (%s)", ospf_dbd->options, options );
flags_offset=0;
if(( ospf_dbd->flags & OSPF_DBD_FLAG_MS ) == OSPF_DBD_FLAG_MS){
strcpy( (char *)(flags + flags_offset), "_I_");
flags_offset+=1;
}
if(( ospf_dbd->flags & OSPF_DBD_FLAG_M ) == OSPF_DBD_FLAG_M){
strcpy((char *) (flags + flags_offset), "_M_");
flags_offset+=3;
}
if(( ospf_dbd->flags & OSPF_DBD_FLAG_I ) == OSPF_DBD_FLAG_I){
strcpy((char *) (flags + flags_offset), "_I_");
flags_offset+=3;
}
add_item_to_tree(ospf_db_desc_tree, offset + 3 , 1, "Flags: %d (%s)", ospf_dbd->flags, flags );
add_item_to_tree(ospf_db_desc_tree, offset + 4 , 4, "DD Sequence: %d", ntohl(ospf_dbd->dd_sequence) );
}
/* LS Headers will be processed here */
/* skip to the end of DB-Desc header */
offset+=8;
while( ((int) (fd->cap_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
dissect_ospf_lsa(pd, offset, fd, (GtkTree *) tree, FALSE);
offset+=OSPF_LSA_HEADER_LENGTH;
}
}
void
dissect_ospf_ls_req(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_ls_req *ospf_lsr;
GtkWidget *ospf_lsr_tree, *ti;
/* zero or more LS requests may be within a LS Request */
/* we place every request for a LSA in a single subtree */
if (tree) {
while( ((int) ( fd->cap_len - offset)) >= OSPF_LS_REQ_LENGTH ){
ospf_lsr = (e_ospf_ls_req *) &pd[offset];
ti = add_item_to_tree(GTK_WIDGET(tree), offset, OSPF_LS_REQ_LENGTH, "Link State Request");
ospf_lsr_tree = gtk_tree_new();
add_subtree(ti, ospf_lsr_tree, ETT_OSPF_LSR);
switch( ntohl( ospf_lsr->ls_type ) ){
case OSPF_LSTYPE_ROUTER:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Router-LSA (%d)",
ntohl( ospf_lsr->ls_type ) );
break;
case OSPF_LSTYPE_NETWORK:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Network-LSA (%d)",
ntohl( ospf_lsr->ls_type ) );
break;
case OSPF_LSTYPE_SUMMERY:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (IP network) (%d)",
ntohl( ospf_lsr->ls_type ) );
break;
case OSPF_LSTYPE_ASBR:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: Summary-LSA (ASBR) (%d)",
ntohl( ospf_lsr->ls_type ) );
break;
case OSPF_LSTYPE_ASEXT:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: AS-External-LSA (ASBR) (%d)",
ntohl( ospf_lsr->ls_type ) );
break;
default:
add_item_to_tree(ospf_lsr_tree, offset, 4, "LS Type: %d (unknown)",
ntohl( ospf_lsr->ls_type ) );
}
add_item_to_tree(ospf_lsr_tree, offset + 4, 4, "Link State ID : %s",
ip_to_str((guint8 *) &(ospf_lsr->ls_id)));
add_item_to_tree(ospf_lsr_tree, offset + 8, 4, "Advertising Router : %s",
ip_to_str((guint8 *) &(ospf_lsr->adv_router)));
offset+=12;
}
}
}
void
dissect_ospf_ls_upd(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
e_ospf_lsa_upd_hdr *upd_hdr;
guint32 lsa_counter;
GtkWidget *ospf_lsa_upd_tree=NULL, *ti;
upd_hdr = (e_ospf_lsa_upd_hdr *) &pd[offset];
if (tree) {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, (fd->cap_len - offset) , "LS Update Packet");
ospf_lsa_upd_tree = gtk_tree_new();
add_subtree(ti, ospf_lsa_upd_tree, ETT_OSPF_LSA_UPD);
add_item_to_tree(ospf_lsa_upd_tree, offset, 4, "Nr oF LSAs: %d", ntohl(upd_hdr->lsa_nr) );
}
/* skip to the beginning of the first LSA */
offset+=4; /* the LS Upd PAcket contains only a 32 bit #LSAs field */
lsa_counter = 0;
while(lsa_counter < ntohl(upd_hdr->lsa_nr)){
offset+=dissect_ospf_lsa(pd, offset, fd, (GtkTree *) ospf_lsa_upd_tree, TRUE);
lsa_counter += 1;
}
}
void
dissect_ospf_ls_ack(const u_char *pd, int offset, frame_data *fd, GtkTree *tree) {
/* the body of a LS Ack packet simply contains zero or more LSA Headers */
while( ((int)(fd->cap_len - offset)) >= OSPF_LSA_HEADER_LENGTH ) {
dissect_ospf_lsa(pd, offset, fd, (GtkTree *) tree, FALSE);
offset+=OSPF_LSA_HEADER_LENGTH;
}
}
int
dissect_ospf_lsa(const u_char *pd, int offset, frame_data *fd, GtkTree *tree, int disassemble_body) {
e_ospf_lsa_hdr *lsa_hdr;
char *lsa_type;
/* data strutures for the router LSA */
e_ospf_router_lsa *router_lsa;
e_ospf_router_data *router_data;
e_ospf_router_metric *tos_data;
guint16 link_counter;
guint8 tos_counter;
char *link_type;
char *link_id;
/* data structures for the network lsa */
e_ospf_network_lsa *network_lsa;
guint32 *attached_router;
/* data structures for the summary and ASBR LSAs */
e_ospf_summary_lsa *summary_lsa;
guint8 *tos;
guint16 *tos_metric;
GtkWidget *ospf_lsa_tree, *ti;
lsa_hdr = (e_ospf_lsa_hdr *) &pd[offset];
switch(lsa_hdr->ls_type) {
case OSPF_LSTYPE_ROUTER:
lsa_type="Router LSA";
break;
case OSPF_LSTYPE_NETWORK:
lsa_type="Network LSA";
break;
case OSPF_LSTYPE_SUMMERY:
lsa_type="Summery LSA";
break;
case OSPF_LSTYPE_ASBR:
lsa_type="ASBR LSA";
break;
case OSPF_LSTYPE_ASEXT:
lsa_type="AS-external-LSA";
break;
default:
lsa_type="unknown";
}
if (tree) {
if(disassemble_body){
ti = add_item_to_tree(GTK_WIDGET(tree), offset, ntohs(lsa_hdr->length),
"%s (Type: %d)", lsa_type, lsa_hdr->ls_type);
} else {
ti = add_item_to_tree(GTK_WIDGET(tree), offset, OSPF_LSA_HEADER_LENGTH, "LSA Header");
}
ospf_lsa_tree = gtk_tree_new();
add_subtree(ti, ospf_lsa_tree, ETT_OSPF_LSA);
add_item_to_tree(ospf_lsa_tree, offset, 2, "LS Age: %d seconds", ntohs(lsa_hdr->ls_age));
add_item_to_tree(ospf_lsa_tree, offset + 2, 1, "Options: %d ", lsa_hdr->options);
add_item_to_tree(ospf_lsa_tree, offset + 3, 1, "LSA Type: %d (%s)", lsa_hdr->ls_type, lsa_type);
add_item_to_tree(ospf_lsa_tree, offset + 4, 4, "Linke State ID: %s ",
ip_to_str((guint8 *) &(lsa_hdr->ls_id)));
add_item_to_tree(ospf_lsa_tree, offset + 8, 4, "Advertising Router: %s ",
ip_to_str((guint8 *) &(lsa_hdr->adv_router)));
add_item_to_tree(ospf_lsa_tree, offset + 12, 4, "LS Sequence Number: 0x%04x ",
ntohl(lsa_hdr->ls_seq));
add_item_to_tree(ospf_lsa_tree, offset + 16, 2, "LS Checksum: %d ", ntohs(lsa_hdr->ls_checksum));
add_item_to_tree(ospf_lsa_tree, offset + 18, 2, "Length: %d ", ntohs(lsa_hdr->length));
if(!disassemble_body){
return OSPF_LSA_HEADER_LENGTH;
}
/* the LSA body starts afte 20 bytes of LSA Header */
offset+=20;
switch(lsa_hdr->ls_type){
case(OSPF_LSTYPE_ROUTER):
router_lsa = (e_ospf_router_lsa *) &pd[offset];
/* again: flags should be secified in detail */
add_item_to_tree(ospf_lsa_tree, offset, 1, "Flags: 0x%02x ", router_lsa->flags);
add_item_to_tree(ospf_lsa_tree, offset + 2, 2, "Nr. of Links: %d ",
ntohs(router_lsa->nr_links));
offset += 4;
/* router_lsa->nr_links links follow
* maybe we should put each of the links into its own subtree ???
*/
for(link_counter = 1 ; link_counter <= ntohs(router_lsa->nr_links); link_counter++){
router_data = (e_ospf_router_data *) &pd[offset];
/* check the Link Type and ID */
switch(router_data->link_type) {
case OSPF_LINK_PTP:
link_type="Point-to-point connection to another router";
link_id="Neighboring router's Router ID";
break;
case OSPF_LINK_TRANSIT:
link_type="Connection to a transit network";
link_id="IP address of Designated Router";
break;
case OSPF_LINK_STUB:
link_type="Connection to a stub network";
link_id="IP network/subnet number";
break;
case OSPF_LINK_VIRTUAL:
link_type="Virtual link";
link_id="Neighboring router's Router ID";
break;
default:
link_type="unknown link type";
link_id="unknown link id";
}
add_item_to_tree(ospf_lsa_tree, offset, 4, "%s: %s", link_id,
ip_to_str((guint8 *) &(router_data->link_id)));
/* link_data should be specified in detail (e.g. network mask) (depends on link type)*/
add_item_to_tree(ospf_lsa_tree, offset + 4, 4, "Link Data: %s",
ip_to_str((guint8 *) &(router_data->link_data)));
add_item_to_tree(ospf_lsa_tree, offset + 8, 1, "Link Type: %d - %s",
router_data->link_type, link_type);
add_item_to_tree(ospf_lsa_tree, offset + 9, 1, "Nr. of TOS metrics: %d", router_data->nr_tos);
add_item_to_tree(ospf_lsa_tree, offset + 10, 2, "TOS 0 metric: %d", ntohs( router_data->tos0_metric ));
offset += 12;
/* router_data->nr_tos metrics may follow each link
* ATTENTION: TOS metrics are not tested (I don't have TOS based routing)
* please send me a mail if it is/isn't working
*/
for(tos_counter = 1 ; link_counter <= ntohs(router_data->nr_tos); tos_counter++){
tos_data = (e_ospf_router_metric *) &pd[offset];
add_item_to_tree(ospf_lsa_tree, offset, 1, "TOS: %d, Metric: %d",
tos_data->tos, ntohs(tos_data->metric));
offset += 4;
}
}
break;
case(OSPF_LSTYPE_NETWORK):
network_lsa = (e_ospf_network_lsa *) &pd[offset];
add_item_to_tree(ospf_lsa_tree, offset, 4, "Netmask: %s",
ip_to_str((guint8 *) &(network_lsa->network_mask)));
offset += 4;
while( ((int) (fd->cap_len - offset)) >= 4){
attached_router = (guint32 *) &pd[offset];
add_item_to_tree(ospf_lsa_tree, offset, 4, "Attached Router: %s",
ip_to_str((guint8 *) attached_router));
offset += 4;
}
break;
case(OSPF_LSTYPE_SUMMERY):
/* Type 3 and 4 LSAs have the same format */
case(OSPF_LSTYPE_ASBR):
summary_lsa = (e_ospf_summary_lsa *) &pd[offset];
add_item_to_tree(ospf_lsa_tree, offset, 4, "Netmask: %s",
ip_to_str((guint8 *) &(summary_lsa->network_mask)));
break;
case(OSPF_LSTYPE_ASEXT):
/* not yet implemented */
add_item_to_tree(ospf_lsa_tree, offset, (fd->cap_len - offset), "AS-external-LSA not yet implemented");
break;
default:
/* unknown LSA type */
add_item_to_tree(ospf_lsa_tree, offset, (fd->cap_len - offset), "Unknown LSA Type");
}
}
/* return the length of this LSA */
return ntohs(lsa_hdr->length);
}
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