/* packet-icp.c * Routines for ICP (internet cache protocol) packet disassembly * RFC 2186 && RFC 2187 * By Peter Torvals * Copyright 1999 Peter Torvals * * $Id: packet-icp.c,v 1.23 2002/08/28 21:00:17 jmayer Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #define MAX_TEXTBUF_LENGTH 600 #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include #include static int proto_icp=-1; static int hf_icp_length=-1; static int hf_icp_opcode=-1; static int hf_icp_version=-1; static int hf_icp_request_nr=-1; static gint ett_icp = -1; static gint ett_icp_payload = -1; #define UDP_PORT_ICP 3130 #define CODE_ICP_OP_QUERY 1 #define CODE_ICP_OP_INVALID 0 #define CODE_ICP_OP_HIT 2 #define CODE_ICP_OP_MISS 3 #define CODE_ICP_OP_ERR 4 #define CODE_ICP_OP_SEND 5 #define CODE_ICP_OP_SENDA 6 #define CODE_ICP_OP_DATABEG 7 #define CODE_ICP_OP_DATA 8 #define CODE_ICP_OP_DATAEND 9 #define CODE_ICP_OP_SECHO 10 #define CODE_ICP_OP_DECHO 11 #define CODE_ICP_OP_MISS_NOFETCH 21 #define CODE_ICP_OP_DENIED 22 #define CODE_ICP_OP_HIT_OBJ 23 static value_string opcode_vals[] = { { CODE_ICP_OP_INVALID , "ICP_INVALID" }, { CODE_ICP_OP_QUERY , "ICP_QUERY" }, { CODE_ICP_OP_HIT , "ICP_HIT" }, { CODE_ICP_OP_MISS , "ICP_MISS" }, { CODE_ICP_OP_ERR , "ICP_ERR" }, { CODE_ICP_OP_SEND, "ICP_SEND" }, { CODE_ICP_OP_SENDA, "ICP_SENDA"}, { CODE_ICP_OP_DATABEG, "ICP_DATABEG"}, { CODE_ICP_OP_DATA, "ICP_DATA"}, { CODE_ICP_OP_DATAEND, "ICP_DATA_END"}, { CODE_ICP_OP_SECHO , "ICP_SECHO"}, { CODE_ICP_OP_DECHO , "ICP_DECHO"}, { CODE_ICP_OP_MISS_NOFETCH , "ICP_MISS_NOFETCH"}, { CODE_ICP_OP_DENIED , "ICP_DENIED"}, { CODE_ICP_OP_HIT_OBJ , "ICP_HIT_OBJ"}, { 0, NULL} }; static void dissect_icp_payload(tvbuff_t *tvb, int offset, proto_tree *pload_tree, guint8 opcode) { gint stringlength; guint16 objectlength; switch(opcode) { case CODE_ICP_OP_QUERY: /* 4 byte requester host address */ proto_tree_add_text(pload_tree, tvb,offset,4, "Requester Host Address %s", ip_to_str(tvb_get_ptr(tvb, offset, 4))); offset += 4; /* null terminated URL */ stringlength = tvb_strsize(tvb, offset); proto_tree_add_text(pload_tree, tvb, offset, stringlength, "URL: %s", tvb_get_ptr(tvb, offset, stringlength)); break; case CODE_ICP_OP_SECHO: case CODE_ICP_OP_DECHO: case CODE_ICP_OP_HIT: case CODE_ICP_OP_MISS: case CODE_ICP_OP_ERR: case CODE_ICP_OP_MISS_NOFETCH: case CODE_ICP_OP_DENIED: stringlength = tvb_strsize(tvb, offset); proto_tree_add_text(pload_tree, tvb, offset, stringlength, "URL: %s", tvb_get_ptr(tvb, offset, stringlength)); break; case CODE_ICP_OP_HIT_OBJ: /* null terminated URL */ stringlength = tvb_strsize(tvb, offset); proto_tree_add_text(pload_tree, tvb, offset, stringlength, "URL: %s", tvb_get_ptr(tvb, offset, stringlength)); offset += stringlength; /* 2 byte object size */ /* object data not recommended by standard*/ objectlength=tvb_get_ntohs(tvb, offset); proto_tree_add_text(pload_tree, tvb,offset,2,"Object length: %u", objectlength); offset += 2; /* object data not recommended by standard*/ proto_tree_add_text(pload_tree, tvb,offset,objectlength,"Object data"); if (objectlength > tvb_reported_length_remaining(tvb, offset)) { proto_tree_add_text(pload_tree, tvb,offset,0, "Packet is fragmented, rest of object is in next udp packet"); } break; default: break; } } static void dissect_icp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *icp_tree , *payload_tree; proto_item *ti , *payloadtf; guint8 opcode; guint16 message_length; guint32 request_number; guint32 options; guint32 option_data; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "ICP"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); opcode=tvb_get_guint8(tvb, 0); message_length=tvb_get_ntohs(tvb, 2); request_number=tvb_get_ntohl(tvb, 4); if (check_col(pinfo->cinfo, COL_INFO)) { col_add_fstr(pinfo->cinfo,COL_INFO,"Opcode: %s (%u), Req Nr: %u", val_to_str(opcode, opcode_vals, "Unknown"), opcode, request_number); } if (tree) { ti = proto_tree_add_item(tree,proto_icp, tvb, 0, message_length, FALSE); icp_tree = proto_item_add_subtree(ti, ett_icp); proto_tree_add_uint(icp_tree,hf_icp_opcode, tvb, 0, 1, opcode); proto_tree_add_item(icp_tree,hf_icp_version, tvb, 1, 1, FALSE); proto_tree_add_uint(icp_tree,hf_icp_length, tvb, 2, 2, message_length); proto_tree_add_uint(icp_tree,hf_icp_request_nr, tvb, 4, 4, request_number); options=tvb_get_ntohl(tvb, 8); if ( (opcode == CODE_ICP_OP_QUERY) && ((options & 0x80000000 ) != 0) ) { proto_tree_add_text(icp_tree, tvb,8,4, "option: ICP_FLAG_HIT_OBJ"); } if ( (opcode == CODE_ICP_OP_QUERY)&& ((options & 0x40000000 ) != 0) ) { proto_tree_add_text(icp_tree, tvb,8,4, "option:ICP_FLAG_SRC_RTT"); } if ((opcode != CODE_ICP_OP_QUERY)&& ((options & 0x40000000 ) != 0)) { option_data=tvb_get_ntohl(tvb, 12); proto_tree_add_text(icp_tree, tvb,8,8, "option: ICP_FLAG_SCR_RTT RTT=%u", option_data & 0x0000ffff); } proto_tree_add_text(icp_tree, tvb, 16, 4, "Sender Host IP address %s", ip_to_str(tvb_get_ptr(tvb, 16, 4))); payloadtf = proto_tree_add_text(icp_tree, tvb, 20, message_length - 20, "Payload"); payload_tree = proto_item_add_subtree(payloadtf, ett_icp_payload); dissect_icp_payload(tvb, 20, payload_tree, opcode); } } void proto_register_icp(void) { static hf_register_info hf[] = { { &hf_icp_opcode, { "Opcode", "icp.opcode", FT_UINT8, BASE_HEX, VALS(opcode_vals), 0x0, "", HFILL }}, { &hf_icp_version, { "Version", "icp.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icp_length, { "Length", "icp.length", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icp_request_nr, { "Request Number", "icp.nr", FT_UINT32, BASE_DEC, NULL, 0x0, "", HFILL }}, }; static gint *ett[] = { &ett_icp, &ett_icp_payload, }; proto_icp = proto_register_protocol("Internet Cache Protocol", "ICP", "icp"); proto_register_field_array(proto_icp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_icp(void) { dissector_handle_t icp_handle; icp_handle = create_dissector_handle(dissect_icp, proto_icp); dissector_add("udp.port", UDP_PORT_ICP, icp_handle); }