forked from osmocom/wireshark
255 lines
7.3 KiB
C
255 lines
7.3 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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* By Peter Torvals
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* Copyright 1999 Peter Torvals
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*
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* $Id: packet-icp.c,v 1.23 2002/08/28 21:00:17 jmayer Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998
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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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#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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/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 UDP_PORT_ICP 3130
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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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static void dissect_icp_payload(tvbuff_t *tvb, int offset,
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proto_tree *pload_tree, guint8 opcode)
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{
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gint stringlength;
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guint16 objectlength;
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switch(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, tvb,offset,4,
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"Requester Host Address %s",
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ip_to_str(tvb_get_ptr(tvb, offset, 4)));
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offset += 4;
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/* null terminated URL */
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stringlength = tvb_strsize(tvb, offset);
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proto_tree_add_text(pload_tree, tvb, offset, stringlength,
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"URL: %s", tvb_get_ptr(tvb, offset, stringlength));
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break;
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case CODE_ICP_OP_SECHO:
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case CODE_ICP_OP_DECHO:
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case CODE_ICP_OP_HIT:
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case CODE_ICP_OP_MISS:
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case CODE_ICP_OP_ERR:
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case CODE_ICP_OP_MISS_NOFETCH:
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case CODE_ICP_OP_DENIED:
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stringlength = tvb_strsize(tvb, offset);
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proto_tree_add_text(pload_tree, tvb, offset, stringlength,
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"URL: %s", tvb_get_ptr(tvb, offset, stringlength));
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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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stringlength = tvb_strsize(tvb, offset);
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proto_tree_add_text(pload_tree, tvb, offset, stringlength,
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"URL: %s", tvb_get_ptr(tvb, offset, stringlength));
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offset += stringlength;
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/* 2 byte object size */
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/* object data not recommended by standard*/
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objectlength=tvb_get_ntohs(tvb, offset);
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proto_tree_add_text(pload_tree, tvb,offset,2,"Object length: %u", objectlength);
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offset += 2;
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/* object data not recommended by standard*/
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proto_tree_add_text(pload_tree, tvb,offset,objectlength,"Object data");
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if (objectlength > tvb_reported_length_remaining(tvb, offset))
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{
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proto_tree_add_text(pload_tree, tvb,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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break;
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default:
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break;
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}
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}
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static void dissect_icp(tvbuff_t *tvb, packet_info *pinfo, 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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guint8 opcode;
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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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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ICP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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opcode=tvb_get_guint8(tvb, 0);
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message_length=tvb_get_ntohs(tvb, 2);
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request_number=tvb_get_ntohl(tvb, 4);
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if (check_col(pinfo->cinfo, COL_INFO))
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{
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col_add_fstr(pinfo->cinfo,COL_INFO,"Opcode: %s (%u), Req Nr: %u",
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val_to_str(opcode, opcode_vals, "Unknown"), opcode,
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request_number);
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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, tvb, 0, message_length, FALSE);
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icp_tree = proto_item_add_subtree(ti, ett_icp);
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proto_tree_add_uint(icp_tree,hf_icp_opcode, tvb, 0, 1, opcode);
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proto_tree_add_item(icp_tree,hf_icp_version, tvb, 1, 1, FALSE);
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proto_tree_add_uint(icp_tree,hf_icp_length, tvb, 2, 2, message_length);
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proto_tree_add_uint(icp_tree,hf_icp_request_nr, tvb, 4, 4,
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request_number);
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options=tvb_get_ntohl(tvb, 8);
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if ( (opcode == CODE_ICP_OP_QUERY) && ((options & 0x80000000 ) != 0) )
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{
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proto_tree_add_text(icp_tree, tvb,8,4,
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"option: ICP_FLAG_HIT_OBJ");
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}
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if ( (opcode == CODE_ICP_OP_QUERY)&& ((options & 0x40000000 ) != 0) )
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{
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proto_tree_add_text(icp_tree, tvb,8,4,
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"option:ICP_FLAG_SRC_RTT");
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}
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if ((opcode != CODE_ICP_OP_QUERY)&& ((options & 0x40000000 ) != 0))
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{
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option_data=tvb_get_ntohl(tvb, 12);
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proto_tree_add_text(icp_tree, tvb,8,8,
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"option: ICP_FLAG_SCR_RTT RTT=%u",
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option_data & 0x0000ffff);
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}
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proto_tree_add_text(icp_tree, tvb, 16, 4,
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"Sender Host IP address %s",
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ip_to_str(tvb_get_ptr(tvb, 16, 4)));
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payloadtf = proto_tree_add_text(icp_tree, tvb,
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20, 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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dissect_icp_payload(tvb, 20, payload_tree, opcode);
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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, VALS(opcode_vals),
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0x0, "", HFILL }},
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{ &hf_icp_version,
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{ "Version", "icp.version", FT_UINT8, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_icp_length,
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{ "Length", "icp.length", FT_UINT16, BASE_DEC, NULL,
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0x0, "", HFILL }},
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{ &hf_icp_request_nr,
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{ "Request Number", "icp.nr", FT_UINT32, BASE_DEC, NULL,
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0x0, "", HFILL }},
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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",
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"ICP", "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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void
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proto_reg_handoff_icp(void)
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{
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dissector_handle_t icp_handle;
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icp_handle = create_dissector_handle(dissect_icp, proto_icp);
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dissector_add("udp.port", UDP_PORT_ICP, icp_handle);
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}
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