Ethereal-dev: [Ethereal-dev] Status of dissector generation
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From: Richard Sharpe <sharpe@xxxxxxxxxx>
Date: Fri, 20 Oct 2000 16:30:05 +0900
Hi, Attached are the xml file I used to describe the relatively simple ident protocol and the current state of the output from my dissector generator ... It assumes a bunch of new routines, and I still have to generate the main dissector, but I can handle quite a bit ... My next steps will be to try it on a description of the SMB protocol ...
<proto name="identd" longname="Identification Protocol (RFC1413)" tcp.port="113">
<struct name="userid">
<field type="BYTES" size="*" value=" " />
<field type="BYTES" size="1" value=":" />
<field type="BYTES" size="*" value=" " />
<field type="BYTES" name="user" size="1+" term="EOF" /><!-- END_OF_FRAME? -->
</struct>
<struct name="error">
<field type="BYTES" size="*" value=" " />
<field type="BYTES" size="1" value=":" />
<field type="BYTES" size="*" value=" " />
<field type="BYTES" name="error-msg" size="1+" term="EOF" /><!-- END_OF_FRAME? -->
</struct>
<struct name="request">
<field name="port-on-server" type="BYTES" size="1+" convtype="UINT16" />
<field type="BYTES" size="*" value=" " />
<field type="BYTES" size="1" value="," />
<field type="BYTES" size="*" value=" " />
<field name="port-on-client" size="1+" type="BYTES" convtype="UINT16" />
</struct>
<struct name="reply">
<field name="port-on-client" type="BYTES" size="1+" convtype="UINT16" />
<field type="BYTES" size="*" value=" " />
<field type="BYTES" size="1" value="," />
<field type="BYTES" size="*" value=" " />
<field name="port-on-server" size="1+" type="BYTES" convtype="UINT16" />
<field type="BYTES" size="1" value=" " />
<field type="BYTES" size="1" value=":" />
<field type="BYTES" size="*" value=" " />
<alternate basedon="." type="BYTES">
<field type="userid" bovalue="USERID" />
<field type="error" bovalue="ERROR" />
</alternate>
</struct>
<exchanges>
<sequence>
<request type="request" />
<response type="reply" />
</sequence>
</exchanges>
</proto>/* packet-identd.c
* Routines for identd (Identification Protocol (RFC1413)) packet disassembly
*
* $Id: $
*
* Copyright (c) 2000 by YOUR NAME HERE <YOUR EMAIL HERE>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs
* Copyright 1999 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
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <glib.h>
#include <string.h>
#include "packet.h"
#include "resolv.h"
#include "prefs.h"
#define TCP_PORT_IDENTD 113
void proto_reg_handoff_identd(void);
static int proto_identd = -1;
static int ett_identd = -1;
static int ett_identd_request = -1;
static int ett_identd_reply = -1;
int
dissect_identd_request(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree *ti = NULL, request_tree = NULL;
int cc, st_offset = offset;
guint32 var_port_on_server;
guint32 var_port_on_client;
if (tree) {
ti = proto_tree_add_text(tree, offset, 0, "request");
request_tree = proto_tree_add_subtree(ti, ett_identd_request);
}
/* Handle the port-on-server field */
if ((cc = ptvcursor_get_item_uint16(tvb, offset, 0, 0, &var_port_on_server)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "port-on-server: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size 1, value , */
if ((cc = tvb_skip_bytes(tvb, offset, ",", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the port-on-client field */
if ((cc = ptvcursor_get_item_uint16(tvb, offset, 0, 0, &var_port_on_client)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "port-on-client: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
return (offset - st_offset);
}
int
dissect_identd_reply(tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree *ti = NULL, reply_tree = NULL;
int cc, st_offset = offset;
guint32 var_port_on_client;
guint32 var_port_on_server;
guint32 var_user;
guint32 var_error_msg;
if (tree) {
ti = proto_tree_add_text(tree, offset, 0, "reply");
reply_tree = proto_tree_add_subtree(ti, ett_identd_reply);
}
/* Handle the port-on-client field */
if ((cc = ptvcursor_get_item_uint16(tvb, offset, 0, 0, &var_port_on_client)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "port-on-client: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size 1, value , */
if ((cc = tvb_skip_bytes(tvb, offset, ",", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the port-on-server field */
if ((cc = ptvcursor_get_item_uint16(tvb, offset, 0, 0, &var_port_on_server)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "port-on-server: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
/* Handle the un-named field of size 1, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size 1, value : */
if ((cc = tvb_skip_bytes(tvb, offset, ":", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
if (tvb_strneql(tvb, offset, "USERID", 6) == 0) {
offset += 6;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size 1, value : */
if ((cc = tvb_skip_bytes(tvb, offset, ":", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the user field */
if ((cc = ptvcursor_get_item_(tvb, offset, 0, 0, &var_user)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "user: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
}
else if (tvb_strneql(tvb, offset, "ERROR", 5) == 0) {
offset += 5;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size 1, value : */
if ((cc = tvb_skip_bytes(tvb, offset, ":", 1, 1, 1)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the un-named field of size *, value */
if ((cc = tvb_skip_bytes(tvb, offset, " ", 1, 0, 0)) < 0){
/* Error handling code ... */
}
offset += cc;
/* Handle the error-msg field */
if ((cc = ptvcursor_get_item_(tvb, offset, 0, 0, &var_error_msg)) < 0){
/* Error handling code ... */
}
else {
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, 1+, "error-msg: %s", tvb_format_text(tvb, offset, 1+));
}
offset += cc;
}
return (offset - st_offset);
}
static void
dissect_identd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *identd_tree, *ti;
}
/* Register all the bits needed with the filtering engine */
void
proto_register_identd(void)
{
static hf_register_info hf[] = {
{ &hf_identd_req,
/* Change the following to the type you need */
{ "Request", "identd.req", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "" }},
{ &hf_identd_rsp,
{ "Response", "identd.rsp", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "" }},
/* Add more fields here */
};
static gint *ett[] = {
&ett_identd
};
module_t *identd_module;
/* Register our configuration options for , particularly our port */
identd_module = prefs_register_module("identd", "IDENTD", proto_reg_handoff_identd);
prefs_register_uint_preference(identd_module, "tcp.port", " TCP Port",
"Set the port for messages (if other"
" than the default of 113)",
10, &global_identd_tcp_port);
proto_identd = proto_register_protocol("Identification Protocol (RFC1413)",
"identd");
proto_register_field_array(proto_identd, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/* The registration hand-off routine */
void
proto_reg_handoff_identd(void)
{
static int identd_prefs_initialized = FALSE;
if (identd_prefs_initialized) {
dissector_delete("tcp.port", tcp_port, dissect_identd);
}
else {
identd_prefs_initialized = TRUE;
}
/* Set our port number for future use */
tcp_port = global_identd_tcp_port;
dissector_add("tcp.port", global_identd_tcp_port, dissect_identd);
}
Regards ------- Richard Sharpe, sharpe@xxxxxxxxxx Samba (Team member, www.samba.org), Ethereal (Team member, www.zing.org) Contributing author, SAMS Teach Yourself Samba in 24 Hours Author, Special Edition, Using Samba
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