289 lines
8.1 KiB
C
289 lines
8.1 KiB
C
/* packet-icp.c
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* Routines for ICP (internet cache protocol) packet disassembly
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* RFC 2186 && RFC 2187
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*
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* $Id: packet-icp.c,v 1.5 2000/03/12 04:47:38 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Peter Torvals
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* Copyright 1999 Peter Torvals
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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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#define MAX_TEXTBUF_LENGTH 600
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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 <stdio.h>
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#include <stdlib.h>
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#include <glib.h>
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#include "packet.h"
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#include "resolv.h"
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static int proto_icp=-1;
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static int hf_icp_length=-1;
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static int hf_icp_opcode=-1;
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static int hf_icp_version=-1;
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static int hf_icp_request_nr=-1;
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static gint ett_icp = -1;
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static gint ett_icp_payload = -1;
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#define CODE_ICP_OP_QUERY 1
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#define CODE_ICP_OP_INVALID 0
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#define CODE_ICP_OP_HIT 2
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#define CODE_ICP_OP_MISS 3
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#define CODE_ICP_OP_ERR 4
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#define CODE_ICP_OP_SEND 5
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#define CODE_ICP_OP_SENDA 6
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#define CODE_ICP_OP_DATABEG 7
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#define CODE_ICP_OP_DATA 8
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#define CODE_ICP_OP_DATAEND 9
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#define CODE_ICP_OP_SECHO 10
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#define CODE_ICP_OP_DECHO 11
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#define CODE_ICP_OP_MISS_NOFETCH 21
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#define CODE_ICP_OP_DENIED 22
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#define CODE_ICP_OP_HIT_OBJ 23
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static value_string opcode_vals[] = {
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{ CODE_ICP_OP_INVALID , "ICP_INVALID" },
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{ CODE_ICP_OP_QUERY , "ICP_QUERY" },
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{ CODE_ICP_OP_HIT , "ICP_HIT" },
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{ CODE_ICP_OP_MISS , "ICP_MISS" },
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{ CODE_ICP_OP_ERR , "ICP_ERR" },
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{ CODE_ICP_OP_SEND, "ICP_SEND" },
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{ CODE_ICP_OP_SENDA, "ICP_SENDA"},
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{ CODE_ICP_OP_DATABEG, "ICP_DATABEG"},
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{ CODE_ICP_OP_DATA, "ICP_DATA"},
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{ CODE_ICP_OP_DATAEND, "ICP_DATA_END"},
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{ CODE_ICP_OP_SECHO , "ICP_SECHO"},
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{ CODE_ICP_OP_DECHO , "ICP_DECHO"},
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{ CODE_ICP_OP_MISS_NOFETCH , "ICP_MISS_NOFETCH"},
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{ CODE_ICP_OP_DENIED , "ICP_DENIED"},
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{ CODE_ICP_OP_HIT_OBJ , "ICP_HIT_OBJ"},
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{ 0, NULL}
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};
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typedef struct _e_icphdr
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{
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guint8 opcode;
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guint8 version;
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guint16 message_length;
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guint32 request_number;
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guint32 options;
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guint32 option_data;
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gchar sender_address[4];
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} e_icphdr;
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static gchar textbuf[MAX_TEXTBUF_LENGTH];
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void dissect_icp_payload( const u_char *pd, int offset,
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frame_data *fd,proto_tree *pload_tree, e_icphdr *icph)
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{
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/* To Be Done take care of fragmentation*/
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guint32 maxlength=fd->pkt_len-offset;
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guint32 i;
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guint16 objectlength;
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switch(icph->opcode)
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{
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case CODE_ICP_OP_QUERY:
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/* 4 byte requester host address */
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proto_tree_add_text(pload_tree,offset,4,
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"Requester Host Address %u.%u.%u.%u",
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(guint8)pd[offset],
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(guint8)pd[offset+1],
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(guint8)pd[offset+2],
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(guint8)pd[offset+3]);
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/* null terminated URL */
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for (i=0; i < maxlength &&
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pd[offset+4+i] != 0 && i<(MAX_TEXTBUF_LENGTH-1);i++)
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{
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textbuf[i]=pd[offset+4+i];
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}
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textbuf[i]=0;
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i++;
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proto_tree_add_text(pload_tree, offset+4,i,
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"URL: %s", textbuf);
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break;
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case CODE_ICP_OP_HIT_OBJ:
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/* null terminated url */
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for (i=0; i < maxlength &&
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pd[offset+i] != 0 && i<(MAX_TEXTBUF_LENGTH-1);i++)
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{
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textbuf[i]=pd[offset+i];
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}
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textbuf[i]=0;
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i++;
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proto_tree_add_text(pload_tree, offset,i,
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"URL: %s", textbuf);
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/* 2 byte object size */
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/* object data not recommended by standard*/
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objectlength=pntohs(&pd[offset]);
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proto_tree_add_text(pload_tree,offset,2,"object length: %u", objectlength);
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/* object data not recommended by standard*/
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proto_tree_add_text(pload_tree,offset+2, maxlength-2,"object data");
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if (objectlength > maxlength-2)
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{
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proto_tree_add_text(pload_tree,offset,0,
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"Packet is fragmented, rest of object is in next udp packet");
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}
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case CODE_ICP_OP_MISS:
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case CODE_ICP_OP_HIT:
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for (i=0; i < maxlength &&
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pd[offset+i] != 0 && i<(MAX_TEXTBUF_LENGTH-1);i++)
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{
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textbuf[i]=pd[offset+i];
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}
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textbuf[i]=0;
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i++;
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proto_tree_add_text(pload_tree, offset,i,
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"URL: %s", textbuf);
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default:
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/* check for fragmentation and add message if next part
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of payload in next fragment*/
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break;
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}
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}
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void dissect_icp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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proto_tree *icp_tree , *payload_tree;
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proto_item *ti , *payloadtf;
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e_icphdr icph;
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gchar *opcodestrval;
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/* TBD: check if this is a fragment or first part of udp packet */
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icph.opcode=pd[offset];
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icph.version=pd[offset+1];
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icph.message_length=pntohs(&(pd[offset+2]));
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icph.request_number=pntohl(&(pd[offset+4]));
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memcpy(&icph.options,&pd[offset+8],sizeof(guint32));
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memcpy(&icph.option_data,&pd[offset+12],sizeof(guint32));
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memcpy(icph.sender_address,&pd[offset+16],4);
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opcodestrval = match_strval(icph.opcode,opcode_vals);
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if (opcodestrval == NULL ) opcodestrval= "UNKNOWN OPCODE";
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sprintf(textbuf,"opc: %s(%u), Req Nr: %u", opcodestrval,
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(guint16)icph.opcode,icph.request_number);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "ICP");
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if (check_col(fd, COL_INFO))
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{
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col_add_fstr(fd,COL_INFO,textbuf);
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}
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if (tree)
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{
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ti = proto_tree_add_item(tree,proto_icp ,offset,fd->pkt_len-offset,
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NULL);
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icp_tree = proto_item_add_subtree(ti, ett_icp);
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proto_tree_add_uint_format(icp_tree,hf_icp_opcode, offset, 1,
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icph.opcode, "Opcode:0x%01x (%s)",icph.opcode, opcodestrval);
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proto_tree_add_uint_format(icp_tree,hf_icp_version, offset+1, 1,
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icph.version,"Version: 0x%01x (%d)", icph.version, (int)icph.version);
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proto_tree_add_uint_format(icp_tree,hf_icp_length, offset+2, 2,
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icph.message_length,
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"Length: 0x%02x (%d)", icph.message_length,(int)icph.message_length);
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proto_tree_add_uint_format(icp_tree,hf_icp_request_nr, offset+4, 4,
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icph.request_number,
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"Request Number: 0x%04x (%u)", icph.request_number,icph.request_number);
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if ( (icph.opcode == CODE_ICP_OP_QUERY) && ((icph.options & 0x80000000 ) != 0) )
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{
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proto_tree_add_text(icp_tree,offset+8,4,
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"option: ICP_FLAG_HIT_OBJ");
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}
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if ( (icph.opcode == CODE_ICP_OP_QUERY)&& ((icph.options & 0x40000000 ) != 0) )
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{
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proto_tree_add_text(icp_tree,offset+8,4,
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"option:ICP_FLAG_SRC_RTT");
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}
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if ((icph.opcode != CODE_ICP_OP_QUERY)&& ((icph.options & 0x40000000 ) != 0))
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{
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proto_tree_add_text(icp_tree,offset+8,8,
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"option: ICP_FLAG_SCR_RTT RTT=%u", icph.option_data & 0x0000ffff);
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}
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proto_tree_add_text(icp_tree,offset+16, 4,
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"Sender Host IP address %u.%u.%u.%u",
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(guint8)icph.sender_address[0],
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(guint8)icph.sender_address[1],
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(guint8)icph.sender_address[2],
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(guint8)icph.sender_address[3]);
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payloadtf = proto_tree_add_text(icp_tree,
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offset+20,icph.message_length - 20,
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"Payload");
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payload_tree = proto_item_add_subtree(payloadtf, ett_icp_payload);
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if (payload_tree !=NULL)
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{
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dissect_icp_payload( pd,
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20+offset,fd,payload_tree,&icph);
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}
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}
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}
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void
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proto_register_icp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_icp_opcode,
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{ "Opcode","icp.opcode", FT_UINT8, BASE_HEX, NULL, 0x0,
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"" }},
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{ &hf_icp_version,
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{ "Version", "icp.version", FT_UINT8, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_icp_length,
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{ "Length","icp.length", FT_UINT16, BASE_DEC, NULL, 0x0,
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"" }},
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{ &hf_icp_request_nr,
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{ "Request Number","icp.nr", FT_UINT32, BASE_DEC, NULL, 0x0,
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"" }},
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};
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static gint *ett[] = {
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&ett_icp,
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&ett_icp_payload,
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};
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proto_icp = proto_register_protocol ("Internet Cache Protocol", "icp");
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proto_register_field_array(proto_icp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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