1999-12-12 03:05:57 +00:00
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/* packet-wccp.c
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* Routines for Web Cache Coordination Protocol dissection
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* Jerry Talkington <jerryt@netapp.com>
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*
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2000-05-31 05:09:07 +00:00
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* $Id: packet-wccp.c,v 1.8 2000/05/31 05:07:54 guy Exp $
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1999-12-12 03:05:57 +00:00
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*
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* Ethereal - Network traffic analyzer
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1999-12-14 01:59:50 +00:00
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* By Gerald Combs <gerald@zing.org>
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1999-12-12 03:05:57 +00:00
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#include <glib.h>
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#include "packet.h"
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1999-12-14 01:59:50 +00:00
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static int proto_wccp = -1;
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static int hf_wccp_message_type = -1; /* the message type */
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static int hf_wccp_version = -1; /* protocol version */
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static int hf_hash_revision = -1; /* the version of the hash */
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static int hf_change_num = -1; /* change number */
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static int hf_recvd_id = -1;
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static int hf_cache_ip = -1;
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static gint ett_wccp = -1;
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static gint ett_cache_count = -1;
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static gint ett_buckets = -1;
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static gint ett_flags = -1;
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static gint ett_cache_info = -1;
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1999-12-12 03:10:14 +00:00
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/*
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* See
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*
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* http://search.ietf.org/internet-drafts/draft-ietf-wrec-web-pro-00.txt
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*
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* if it hasn't expired yet.
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*/
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2000-04-08 07:07:42 +00:00
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#define UDP_PORT_WCCP 2048
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1999-12-12 03:05:57 +00:00
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#define WCCPv1 0x0004
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1999-12-14 01:59:50 +00:00
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#define WCCP_HERE_I_AM 7
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#define WCCP_I_SEE_YOU 8
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#define WCCP_ASSIGN_BUCKET 9
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static const value_string wccp_type_vals[] = {
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{ WCCP_HERE_I_AM, "Here I am" },
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{ WCCP_I_SEE_YOU, "I see you" },
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{ WCCP_ASSIGN_BUCKET, "Assign bucket" },
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{ 0, NULL }
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1999-12-12 03:05:57 +00:00
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};
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static const value_string wccp_version_val[] = {
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{ WCCPv1, "1"},
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{ 0, NULL}
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};
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1999-12-14 01:59:50 +00:00
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#define HASH_INFO_SIZE (4*(1+8+1))
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1999-12-12 03:05:57 +00:00
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1999-12-14 01:59:50 +00:00
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#define WCCP_U_FLAG 0x80000000
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static void dissect_hash_data(const u_char *pd, int offset,
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proto_tree *wccp_tree);
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static void dissect_web_cache_list_entry(const u_char *pd, int offset,
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int index, proto_tree *wccp_tree);
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static int wccp_bucket_info(guint8 bucket_info, proto_tree *bucket_tree,
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guint32 start, int offset);
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static gchar *bucket_name(guint8 bucket);
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2000-04-08 07:07:42 +00:00
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static void
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1999-12-12 03:05:57 +00:00
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dissect_wccp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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proto_tree *wccp_tree = NULL;
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1999-12-14 01:59:50 +00:00
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proto_item *wccp_tree_item;
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guint32 wccp_message_type;
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guint32 wccp_version;
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guint32 cache_count;
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int i;
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1999-12-12 03:05:57 +00:00
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if(check_col(fd, COL_PROTOCOL)) {
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col_add_str(fd, COL_PROTOCOL, "WCCP");
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}
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1999-12-14 01:59:50 +00:00
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1999-12-12 03:05:57 +00:00
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wccp_message_type = pntohl(&pd[offset]);
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if(check_col(fd, COL_INFO)) {
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1999-12-14 01:59:50 +00:00
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col_add_str(fd, COL_INFO, val_to_str(wccp_message_type,
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wccp_type_vals, "Unknown WCCP message (%u)"));
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1999-12-12 03:05:57 +00:00
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}
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if(tree != NULL) {
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2000-05-11 08:18:09 +00:00
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wccp_tree_item = proto_tree_add_item(tree, proto_wccp, NullTVB, offset,
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2000-05-31 05:09:07 +00:00
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END_OF_FRAME, FALSE);
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1999-12-12 03:05:57 +00:00
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wccp_tree = proto_item_add_subtree(wccp_tree_item, ett_wccp);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_wccp_message_type, NullTVB, offset,
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1999-12-14 01:59:50 +00:00
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sizeof(wccp_message_type), wccp_message_type);
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offset += sizeof(wccp_message_type);
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1999-12-12 03:05:57 +00:00
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1999-12-14 01:59:50 +00:00
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switch (wccp_message_type) {
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case WCCP_HERE_I_AM:
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wccp_version = pntohl(&pd[offset]);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_wccp_version, NullTVB,
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1999-12-14 01:59:50 +00:00
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offset, 4, wccp_version);
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offset += 4;
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dissect_hash_data(pd, offset, wccp_tree);
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offset += HASH_INFO_SIZE;
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_recvd_id, NullTVB, offset,
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1999-12-14 01:59:50 +00:00
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4, pntohl(&pd[offset]));
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offset += 4;
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break;
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case WCCP_I_SEE_YOU:
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wccp_version = pntohl(&pd[offset]);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_wccp_version, NullTVB,
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1999-12-14 01:59:50 +00:00
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offset, 4, wccp_version);
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offset += 4;
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_change_num, NullTVB, offset,
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1999-12-14 01:59:50 +00:00
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4, pntohl(&pd[offset]));
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offset += 4;
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_recvd_id, NullTVB, offset,
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1999-12-14 01:59:50 +00:00
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4, pntohl(&pd[offset]));
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offset += 4;
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1999-12-12 03:05:57 +00:00
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cache_count = pntohl(&pd[offset]);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(wccp_tree, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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"Number of Web Caches: %u", cache_count);
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offset += 4;
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for (i = 0; i < cache_count; i++) {
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dissect_web_cache_list_entry(pd, offset, i,
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wccp_tree);
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offset += 4 + HASH_INFO_SIZE;
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1999-12-12 03:05:57 +00:00
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}
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1999-12-14 01:59:50 +00:00
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break;
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case WCCP_ASSIGN_BUCKET:
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/*
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* This hasn't been tested, since I don't have any
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* traces with this in it.
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*/
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_recvd_id, NullTVB, offset,
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1999-12-14 01:59:50 +00:00
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4, pntohl(&pd[offset]));
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offset += 4;
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cache_count = pntohl(&pd[offset]);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(wccp_tree, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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"Number of Web Caches: %u", cache_count);
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offset += 4;
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for (i = 0; i < cache_count; i++) {
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2000-03-12 04:48:32 +00:00
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proto_tree_add_ipv4_format(wccp_tree,
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2000-05-11 08:18:09 +00:00
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hf_cache_ip, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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pntohl(&pd[offset]),
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"Web Cache %d IP Address: %s", i,
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ip_to_str((guint8 *) &pd[offset]));
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offset += 4;
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1999-12-12 03:05:57 +00:00
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}
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1999-12-14 01:59:50 +00:00
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for (i = 0; i < 256; i += 4) {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(wccp_tree, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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"Buckets %d - %d: %10s %10s %10s %10s",
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i, i + 3,
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bucket_name(pd[offset]),
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bucket_name(pd[offset+1]),
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bucket_name(pd[offset+2]),
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bucket_name(pd[offset+3]));
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offset += 4;
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1999-12-12 03:05:57 +00:00
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}
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1999-12-14 01:59:50 +00:00
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break;
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default:
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wccp_version = pntohl(&pd[offset]);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_wccp_version, NullTVB,
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1999-12-14 01:59:50 +00:00
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offset, 4, wccp_version);
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offset += 4;
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dissect_data(pd, offset, fd, wccp_tree);
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break;
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1999-12-12 03:05:57 +00:00
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}
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}
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}
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1999-12-14 01:59:50 +00:00
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static void
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dissect_hash_data(const u_char *pd, int offset, proto_tree *wccp_tree)
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{
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proto_item *bucket_item;
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proto_tree *bucket_tree;
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proto_item *tf;
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proto_tree *field_tree;
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int i;
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guint8 bucket_info;
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int n;
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guint32 flags;
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2000-05-31 05:09:07 +00:00
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proto_tree_add_uint(wccp_tree, hf_hash_revision, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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pntohl(&pd[offset]));
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offset += 4;
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2000-05-11 08:18:09 +00:00
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bucket_item = proto_tree_add_text(wccp_tree, NullTVB, offset, 32,
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1999-12-14 01:59:50 +00:00
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"Hash information");
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bucket_tree = proto_item_add_subtree(bucket_item, ett_buckets);
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for (i = 0, n = 0; i < 32; i++) {
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bucket_info = pd[offset];
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n = wccp_bucket_info(bucket_info, bucket_tree, n, offset);
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offset += 1;
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}
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flags = pntohl(&pd[offset]);
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2000-05-11 08:18:09 +00:00
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tf = proto_tree_add_text(wccp_tree, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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"Flags: 0x%08X (%s)", flags,
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((flags & WCCP_U_FLAG) ?
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"Hash information is historical" :
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"Hash information is current"));
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field_tree = proto_item_add_subtree(tf, ett_flags);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(field_tree, NullTVB, offset, 4, "%s",
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1999-12-14 01:59:50 +00:00
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decode_boolean_bitfield(flags, WCCP_U_FLAG,
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sizeof (flags)*8,
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"Hash information is historical",
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"Hash information is current"));
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}
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static void
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dissect_web_cache_list_entry(const u_char *pd, int offset, int index,
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proto_tree *wccp_tree)
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{
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proto_item *tl;
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proto_tree *list_entry_tree;
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2000-05-11 08:18:09 +00:00
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tl = proto_tree_add_text(wccp_tree, NullTVB, offset, 4 + HASH_INFO_SIZE,
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1999-12-14 01:59:50 +00:00
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"Web-Cache List Entry(%d)", index);
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list_entry_tree = proto_item_add_subtree(tl,
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ett_cache_info);
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2000-05-31 05:09:07 +00:00
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proto_tree_add_ipv4(list_entry_tree, hf_cache_ip, NullTVB, offset, 4,
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1999-12-14 01:59:50 +00:00
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pntohl(&pd[offset]));
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dissect_hash_data(pd, offset + 4, list_entry_tree);
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}
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1999-12-12 03:05:57 +00:00
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/*
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* wccp_bucket_info()
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* takes an integer representing a "Hash Information" bitmap, and spits out
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* the corresponding proto_tree entries, returning the next bucket number.
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*/
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1999-12-14 01:59:50 +00:00
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static int
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wccp_bucket_info(guint8 bucket_info, proto_tree *bucket_tree, guint32 start,
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int offset)
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1999-12-12 03:05:57 +00:00
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{
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guint32 i;
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for(i = 0; i < 8; i++) {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(bucket_tree, NullTVB, offset, sizeof(bucket_info), "Bucket %3d: %s", start, (bucket_info & 1<<i ? "Assigned" : "Not Assigned") );
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1999-12-12 03:05:57 +00:00
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start++;
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}
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return(start);
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}
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1999-12-14 01:59:50 +00:00
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static gchar *
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bucket_name(guint8 bucket)
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{
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static gchar str[4][10+1];
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static gchar *cur;
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if (cur == &str[0][0])
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cur = &str[1][0];
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else if (cur == &str[1][0])
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cur = &str[2][0];
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else if (cur == &str[2][0])
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cur = &str[3][0];
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else
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cur = &str[0][0];
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if (bucket == 0xff)
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strcpy(cur, "Unassigned");
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else
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sprintf(cur, "%u", bucket);
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return cur;
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}
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1999-12-12 03:05:57 +00:00
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void
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proto_register_wccp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_wccp_message_type,
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1999-12-14 01:59:50 +00:00
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{ "WCCP Message Type", "wccp.message", FT_UINT32, BASE_DEC, VALS(wccp_type_vals), 0x0,
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1999-12-12 03:05:57 +00:00
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"The WCCP message that was sent"}
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},
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{ &hf_wccp_version,
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{ "WCCP Version", "wccp.version", FT_UINT32, BASE_DEC, VALS(wccp_version_val), 0x0,
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"The WCCP version"}
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},
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1999-12-14 01:59:50 +00:00
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{ &hf_hash_revision,
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1999-12-12 03:05:57 +00:00
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{ "Hash Revision", "wccp.hash_revision", FT_UINT32, BASE_DEC, 0x0, 0x0,
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"The cache hash revision"}
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},
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{ &hf_change_num,
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{ "Change Number", "wccp.change_num", FT_UINT32, BASE_DEC, 0x0, 0x0,
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"The Web-Cache list entry change number"}
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},
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{ &hf_recvd_id,
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{ "Received ID", "wccp.recvd_id", FT_UINT32, BASE_DEC, 0x0, 0x0,
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"The number of I_SEE_YOU's that have been sent"}
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},
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{ &hf_cache_ip,
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1999-12-14 01:59:50 +00:00
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{ "Web Cache IP address", "wccp.cache_ip", FT_IPv4, BASE_NONE, NULL, 0x0,
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"The IP address of a Web cache"}
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1999-12-12 03:05:57 +00:00
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},
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1999-12-14 01:59:50 +00:00
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};
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static gint *ett[] = {
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&ett_wccp,
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&ett_cache_count,
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&ett_buckets,
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&ett_flags,
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&ett_cache_info,
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1999-12-12 03:05:57 +00:00
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};
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1999-12-14 01:59:50 +00:00
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proto_wccp = proto_register_protocol("Web Cache Coordination Protocol",
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"wccp");
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1999-12-12 03:05:57 +00:00
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proto_register_field_array(proto_wccp, hf, array_length(hf));
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1999-12-14 01:59:50 +00:00
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proto_register_subtree_array(ett, array_length(ett));
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1999-12-12 03:05:57 +00:00
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}
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2000-04-08 07:07:42 +00:00
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void
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proto_reg_handoff_wccp(void)
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{
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dissector_add("udp.port", UDP_PORT_WCCP, dissect_wccp);
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}
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