forked from osmocom/wireshark
313 lines
9.9 KiB
C
313 lines
9.9 KiB
C
/* 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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* $Id: packet-wccp.c,v 1.2 1999/12/12 03:10:14 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@unicom.net>
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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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/*
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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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#define WCCPv1 0x0004
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#define WCCP_HERE_I_AM 0x0007
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#define WCCP_I_SEE_YOU 0x0008
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#define WCCP_ASSIGN_BUCKET 0x0009
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static const value_string wccp_types[] = {
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{ WCCP_HERE_I_AM, "WCCP_HERE_I_AM" },
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{ WCCP_I_SEE_YOU, "WCCP_I_SEE_YOU" },
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{ WCCP_ASSIGN_BUCKET, "WCCP_ASSIGN_BUCKET" },
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{ 0, NULL}
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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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typedef struct _wccp_cache_info {
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guint32 ip_addr;
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guint32 hash_rev;
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guint32 hash_info[8];
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guint32 reserved;
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} wccp_cache_info;
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static guint32 proto_wccp = -1;
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static guint32 ett_wccp = -1;
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static guint32 ett_cache_count = -1;
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static guint32 ett_cache_info = -1;
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static guint32 ett_buckets = -1;
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static guint32 hf_wccp_message_type = -1; /* the message type */
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static guint32 hf_wccp_version = -1; /* protocol version */
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static guint32 hf_hash_version = -1; /* the version of the hash */
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static guint32 hf_change_num = -1; /* change number */
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static guint32 hf_recvd_id = -1;
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static guint32 hf_cache_ip = -1;
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int wccp_bucket_info(guint8 bucket_info, proto_tree *bucket_tree, guint32 start, int offset);
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void
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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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const u_char *data, *data_end;
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proto_tree *wccp_tree = NULL;
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proto_item *wccp_tree_item = NULL;
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guint32 wccp_message_type = 0;
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data = &pd[offset];
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data_end = data + END_OF_FRAME;
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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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wccp_message_type = pntohl(&pd[offset]);
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if(check_col(fd, COL_INFO)) {
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col_add_str(fd, COL_INFO, val_to_str(wccp_message_type, wccp_types, "Unknown WCCP message"));
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}
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if(tree != NULL) {
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guint32 wccp_version = 0;
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wccp_tree_item = proto_tree_add_item_format(tree, proto_wccp, offset, (data_end - data),
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NULL, "Web Cache Coordination Protocol");
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wccp_tree = proto_item_add_subtree(wccp_tree_item, ett_wccp);
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proto_tree_add_item(wccp_tree, hf_wccp_message_type , offset, sizeof(wccp_message_type), wccp_message_type);
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offset += sizeof(wccp_message_type);
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wccp_version = pntohl(&pd[offset]);
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proto_tree_add_item(wccp_tree, hf_wccp_version, offset, sizeof(wccp_version), wccp_version);
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offset += sizeof(wccp_version);
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if (wccp_message_type == WCCP_HERE_I_AM) {
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guint32 *rsvd;
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guint32 hash_version;
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guint32 recvd_id;
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guint32 i = 0;
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guint32 n = 0;
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guint8 bucket_info;
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proto_tree *bucket_tree = NULL;
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proto_item *bucket_item = NULL;
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hash_version = pntohl(&pd[offset]);
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proto_tree_add_item(wccp_tree, hf_hash_version, offset, sizeof(hash_version), hash_version);
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offset += sizeof(hash_version);
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bucket_item = proto_tree_add_text(wccp_tree, offset, 32, "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 = (guint32)pd[offset];
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n = wccp_bucket_info(bucket_info, bucket_tree, n, offset);
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offset += sizeof(bucket_info);
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}
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/* we only care about the first bit, the rest is just pad */
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rsvd = (guint32 *)&pd[offset];
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proto_tree_add_text(wccp_tree, offset, sizeof(rsvd), ( (*rsvd & (1<<31) ) ? "U: Historical" : "U: Current" ) );
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offset += sizeof(rsvd);
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recvd_id = pntohl(&pd[offset]);
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proto_tree_add_item(wccp_tree, hf_recvd_id, offset, sizeof(recvd_id), recvd_id);
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offset += sizeof(recvd_id); /* copy and paste is fun */
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} else if (wccp_message_type == WCCP_I_SEE_YOU) {
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guint32 change_num = 0;
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guint32 recvd_id = 0;
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guint32 cache_count = 0;
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guint32 i = 0;
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guint32 n = 0;
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guint32 ccount = 0;
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guint8 bucket_info;
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wccp_cache_info *cache_info;
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proto_item *cache_count_item = NULL;
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proto_item *cache_info_item = NULL;
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proto_item *bucket_item = NULL;
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proto_tree *cache_count_tree = NULL;
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proto_tree *cache_info_tree = NULL;
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proto_tree *bucket_tree = NULL;
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change_num = pntohl(&pd[offset]);
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proto_tree_add_item(wccp_tree, hf_change_num, offset, sizeof(change_num), change_num);
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offset += sizeof(change_num);
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recvd_id = pntohl(&pd[offset]);
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proto_tree_add_item(wccp_tree, hf_recvd_id, offset, sizeof(recvd_id), recvd_id);
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offset += sizeof(recvd_id);
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cache_count = pntohl(&pd[offset]);
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cache_count_item = proto_tree_add_text(wccp_tree, offset, sizeof(cache_count), "Number of caches: %i", cache_count);
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offset += sizeof(cache_count);
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cache_count_tree = proto_item_add_subtree(cache_count_item, ett_cache_count);
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for(ccount = 0; ccount < cache_count; ccount++) {
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cache_info = (wccp_cache_info *)&pd[offset];
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cache_info_item = proto_tree_add_item(cache_count_tree, hf_cache_ip, offset, sizeof(cache_info->ip_addr), cache_info->ip_addr);
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offset += sizeof(cache_info->ip_addr);
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cache_info_tree = proto_item_add_subtree(cache_info_item, ett_cache_info);
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proto_tree_add_text(cache_info_tree, offset, sizeof(cache_info->hash_rev), "Hash Revision: %i", cache_info->hash_rev);
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offset += sizeof(cache_info->hash_rev);
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bucket_item = proto_tree_add_text(cache_info_tree, offset, 32, "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 = (guint32)pd[offset];
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n = wccp_bucket_info(bucket_info, bucket_tree, n, offset);
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offset += sizeof(bucket_info);
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}
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proto_tree_add_text(cache_info_tree, offset, sizeof(cache_info->reserved), ( (cache_info->reserved & (1<<31) ) ? "U: Historical" : "U: Current" ) );
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offset += sizeof(cache_info->reserved);
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}
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} else if (wccp_message_type == WCCP_ASSIGN_BUCKET) {
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/* this hasn't been tested, since I don't have any traces with this in it. */
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guint32 recvd_id = 0;
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guint32 wc_count = 0;
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guint32 ip_addr = 0;
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guint16 cache_index;
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guint8 i = 0;
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guint8 bucket_info;
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proto_item *ip_item;
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proto_item *bucket_item;
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proto_tree *ip_tree;
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proto_tree *bucket_tree;
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recvd_id = pd[offset];
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proto_tree_add_item(wccp_tree, hf_recvd_id, offset, sizeof(recvd_id), recvd_id);
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offset += sizeof(recvd_id);
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wc_count = pntohl(&pd[offset]);
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ip_item = proto_tree_add_text(wccp_tree, offset, sizeof(wc_count), "Number of caches: %i", wc_count);
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offset += sizeof(wc_count);
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ip_tree = proto_item_add_subtree(ip_item, ett_cache_count);
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for(i = 0; i < wc_count; i++) {
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ip_addr = pd[offset];
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proto_tree_add_item(ip_tree, hf_cache_ip, offset, sizeof(ip_addr), ip_addr);
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offset += sizeof(ip_addr);
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}
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bucket_item = proto_tree_add_text(wccp_tree, offset, 32, "Bucket Assignments");
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bucket_tree = proto_item_add_subtree(bucket_item, ett_buckets);
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for(i = 0; i < 256; i++) {
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bucket_info = pd[offset];
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if(bucket_info != 0xff) {
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cache_index = g_ntohs((guint16)bucket_info);
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proto_tree_add_text(bucket_tree, offset, sizeof(bucket_info), "Bucket %i: Cache %i", i, bucket_info);
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} else {
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proto_tree_add_text(bucket_tree, offset, sizeof(bucket_info), "Bucket %i: Unassigned", i);
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}
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offset += sizeof(bucket_info);
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}
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}
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}
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}
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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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int
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wccp_bucket_info(guint8 bucket_info, proto_tree *bucket_tree, guint32 start, int offset)
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{
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guint32 i;
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for(i = 0; i < 8; i++) {
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proto_tree_add_text(bucket_tree, offset, sizeof(bucket_info), "Bucket %3d: %s", start, (bucket_info & 1<<i ? "Assigned" : "Not Assigned") );
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start++;
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}
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return(start);
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}
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/* register */
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void
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proto_register_wccp(void)
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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_cache_info,
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&ett_buckets,
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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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{ "WCCP Message Type", "wccp.message", FT_UINT32, BASE_DEC, VALS(wccp_types), 0x0,
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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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{ &hf_hash_version,
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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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{ "Cache IP address", "wccp.cache.ip", FT_IPv4, BASE_NONE, NULL, 0x0,
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"The IP address of a cache"}
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},
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};
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proto_wccp = proto_register_protocol("Web Cache Coordination Protocol", "wccp");
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proto_register_field_array(proto_wccp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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