1999-02-15 06:36:57 +00:00
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/* packet-tftp.c
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* Routines for tftp packet dissection
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*
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* Richard Sharpe <rsharpe@ns.aus.com>
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2000-01-27 07:09:45 +00:00
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* Craig Newell <CraigN@cheque.uq.edu.au>
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* RFC2347 TFTP Option Extension
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1999-02-15 06:36:57 +00:00
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*
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2004-07-18 00:24:25 +00:00
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* $Id$
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1999-02-15 06:36:57 +00:00
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*
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* Ethereal - Network traffic analyzer
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2001-06-10 09:50:20 +00:00
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* By Gerald Combs <gerald@ethereal.com>
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1999-02-15 06:36:57 +00:00
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-bootp.c
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2002-08-28 21:04:11 +00:00
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*
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1999-02-15 06:36:57 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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1999-02-15 06:36:57 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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1999-02-15 06:36:57 +00:00
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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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1999-03-23 03:14:46 +00:00
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#include <glib.h>
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2002-01-21 07:37:49 +00:00
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#include <epan/packet.h>
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#include <epan/conversation.h>
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1999-02-15 06:36:57 +00:00
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1999-07-29 05:47:07 +00:00
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static int proto_tftp = -1;
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2000-11-10 09:17:10 +00:00
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static int hf_tftp_opcode = -1;
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static int hf_tftp_source_file = -1;
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static int hf_tftp_destination_file = -1;
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static int hf_tftp_transfer_type = -1;
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static int hf_tftp_blocknum = -1;
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1999-11-14 10:32:26 +00:00
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static int hf_tftp_error_code = -1;
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2000-11-10 09:17:10 +00:00
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static int hf_tftp_error_string = -1;
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1999-07-29 05:47:07 +00:00
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1999-11-16 11:44:20 +00:00
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static gint ett_tftp = -1;
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2001-11-27 07:13:32 +00:00
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static dissector_handle_t tftp_handle;
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2001-11-26 05:13:14 +00:00
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2000-10-21 09:54:12 +00:00
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#define UDP_PORT_TFTP 69
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2001-02-09 06:08:11 +00:00
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_OACK 6
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1999-05-13 05:46:04 +00:00
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2000-11-10 09:17:10 +00:00
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static const value_string tftp_opcode_vals[] = {
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2001-02-09 06:08:11 +00:00
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{ TFTP_RRQ, "Read Request" },
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{ TFTP_WRQ, "Write Request" },
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{ TFTP_DATA, "Data Packet" },
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{ TFTP_ACK, "Acknowledgement" },
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{ TFTP_ERROR, "Error Code" },
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{ TFTP_OACK, "Option Acknowledgement" },
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{ 0, NULL }
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1999-02-15 06:36:57 +00:00
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};
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2000-11-10 09:17:10 +00:00
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static const value_string tftp_error_code_vals[] = {
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{ 0, "Not defined" },
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{ 1, "File not found" },
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{ 2, "Access violation" },
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{ 3, "Disk full or allocation exceeded" },
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{ 4, "Illegal TFTP Operation" },
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{ 5, "Unknown transfer ID" },
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{ 6, "File already exists" },
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{ 7, "No such user" },
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2002-06-13 08:48:44 +00:00
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{ 8, "Option negotiation failed" },
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2000-11-10 09:17:10 +00:00
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{ 0, NULL }
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1999-02-15 06:36:57 +00:00
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};
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2000-11-10 09:17:10 +00:00
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static void tftp_dissect_options(tvbuff_t *tvb, int offset, proto_tree *tree);
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2000-10-21 09:54:12 +00:00
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static void
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2000-11-10 09:17:10 +00:00
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dissect_tftp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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1999-02-15 06:36:57 +00:00
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{
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2001-11-03 02:19:10 +00:00
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proto_tree *tftp_tree = NULL;
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1999-03-23 03:14:46 +00:00
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proto_item *ti;
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2000-10-21 09:54:12 +00:00
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conversation_t *conversation;
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2000-11-10 09:17:10 +00:00
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gint offset = 0;
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guint16 opcode;
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2002-05-24 22:50:55 +00:00
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guint16 bytes;
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guint16 blocknum;
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2002-08-02 23:36:07 +00:00
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guint i1;
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2001-11-03 02:25:26 +00:00
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guint16 error;
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1999-02-15 06:36:57 +00:00
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2000-10-21 09:54:12 +00:00
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/*
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* The first TFTP packet goes to the TFTP port; the second one
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* comes from some *other* port, but goes back to the same
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* IP address and port as the ones from which the first packet
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* came; all subsequent packets go between those two IP addresses
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* and ports.
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*
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* If this packet went to the TFTP port, we check to see if
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2001-06-10 09:50:20 +00:00
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* there's already a conversation with one address/port pair
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* matching the source IP address and port of this packet,
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* the other address matching the destination IP address of this
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* packet, and any destination port.
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*
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* If not, we create one, with its address 1/port 1 pair being
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* the source address/port of this packet, its address 2 being
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* the destination address of this packet, and its port 2 being
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* wildcarded, and give it the TFTP dissector as a dissector.
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2000-10-21 09:54:12 +00:00
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*/
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2000-11-10 09:17:10 +00:00
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if (pinfo->destport == UDP_PORT_TFTP) {
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2000-11-10 09:22:46 +00:00
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conversation = find_conversation(&pinfo->src, &pinfo->dst, PT_UDP,
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2001-06-10 09:50:20 +00:00
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pinfo->srcport, 0, NO_PORT_B);
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2000-10-21 09:54:12 +00:00
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if (conversation == NULL) {
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2000-11-10 09:22:46 +00:00
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conversation = conversation_new(&pinfo->src, &pinfo->dst, PT_UDP,
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2001-09-03 10:33:12 +00:00
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pinfo->srcport, 0, NO_PORT2);
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2001-11-27 07:13:32 +00:00
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conversation_set_dissector(conversation, tftp_handle);
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2000-10-21 09:54:12 +00:00
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}
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}
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2001-12-10 00:26:21 +00:00
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TFTP");
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2000-11-10 09:17:10 +00:00
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opcode = tvb_get_ntohs(tvb, offset);
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1999-02-15 06:36:57 +00:00
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2001-12-10 00:26:21 +00:00
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if (check_col(pinfo->cinfo, COL_INFO)) {
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1999-02-15 06:36:57 +00:00
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2001-12-10 00:26:21 +00:00
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
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2000-11-10 09:17:10 +00:00
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val_to_str(opcode, tftp_opcode_vals, "Unknown (0x%04x)"));
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1999-02-15 06:36:57 +00:00
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}
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if (tree) {
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2002-01-24 09:20:54 +00:00
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ti = proto_tree_add_item(tree, proto_tftp, tvb, offset, -1, FALSE);
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1999-11-16 11:44:20 +00:00
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tftp_tree = proto_item_add_subtree(ti, ett_tftp);
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1999-02-15 06:36:57 +00:00
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2000-11-10 09:17:10 +00:00
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proto_tree_add_uint(tftp_tree, hf_tftp_opcode, tvb,
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offset, 2, opcode);
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2001-11-03 02:19:10 +00:00
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}
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offset += 2;
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2002-08-28 21:04:11 +00:00
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2001-11-03 02:19:10 +00:00
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switch (opcode) {
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case TFTP_RRQ:
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i1 = tvb_strsize(tvb, offset);
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if (tree) {
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2000-11-10 09:17:10 +00:00
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proto_tree_add_item(tftp_tree, hf_tftp_source_file,
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2000-12-24 20:33:04 +00:00
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tvb, offset, i1, FALSE);
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2001-11-03 02:19:10 +00:00
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}
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2001-12-10 00:26:21 +00:00
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", File: %s",
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2001-11-03 02:19:10 +00:00
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tvb_get_ptr(tvb, offset, i1));
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}
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offset += i1;
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2000-11-10 09:17:10 +00:00
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2001-11-03 02:19:10 +00:00
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i1 = tvb_strsize(tvb, offset);
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if (tree) {
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2000-11-10 09:17:10 +00:00
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ti = proto_tree_add_item(tftp_tree, hf_tftp_transfer_type,
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2000-12-24 20:33:04 +00:00
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tvb, offset, i1, FALSE);
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2001-11-03 02:19:10 +00:00
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}
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2001-12-10 00:26:21 +00:00
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Transfer type: %s",
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2001-11-03 02:19:10 +00:00
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tvb_get_ptr(tvb, offset, i1));
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}
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offset += i1;
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2000-11-10 09:17:10 +00:00
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2001-11-03 02:19:10 +00:00
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if (tree)
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2000-11-10 09:17:10 +00:00
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tftp_dissect_options(tvb, offset, tftp_tree);
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2001-11-03 02:19:10 +00:00
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break;
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case TFTP_WRQ:
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i1 = tvb_strsize(tvb, offset);
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if (tree) {
|
2000-11-10 09:17:10 +00:00
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proto_tree_add_item(tftp_tree, hf_tftp_destination_file,
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2000-12-24 20:33:04 +00:00
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tvb, offset, i1, FALSE);
|
2001-11-03 02:19:10 +00:00
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}
|
2001-12-10 00:26:21 +00:00
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", File: %s",
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2001-11-03 02:19:10 +00:00
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tvb_get_ptr(tvb, offset, i1));
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}
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offset += i1;
|
2000-11-10 09:17:10 +00:00
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2001-11-03 02:19:10 +00:00
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i1 = tvb_strsize(tvb, offset);
|
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if (tree) {
|
2000-11-10 09:17:10 +00:00
|
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ti = proto_tree_add_item(tftp_tree, hf_tftp_transfer_type,
|
2000-12-24 20:33:04 +00:00
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tvb, offset, i1, FALSE);
|
2001-11-03 02:19:10 +00:00
|
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}
|
2001-12-10 00:26:21 +00:00
|
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Transfer type: %s",
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2001-11-03 02:19:10 +00:00
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tvb_get_ptr(tvb, offset, i1));
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}
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offset += i1;
|
2000-11-10 09:17:10 +00:00
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|
2001-11-03 02:19:10 +00:00
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if (tree)
|
2000-11-10 09:17:10 +00:00
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tftp_dissect_options(tvb, offset, tftp_tree);
|
2001-11-03 02:19:10 +00:00
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break;
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case TFTP_DATA:
|
2002-05-24 22:50:55 +00:00
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blocknum = tvb_get_ntohs(tvb, offset);
|
2001-11-03 02:19:10 +00:00
|
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if (tree) {
|
2002-05-24 22:50:55 +00:00
|
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proto_tree_add_uint(tftp_tree, hf_tftp_blocknum, tvb, offset, 2,
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blocknum);
|
2001-11-03 02:19:10 +00:00
|
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}
|
2002-05-24 22:50:55 +00:00
|
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offset += 2;
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bytes = tvb_reported_length_remaining(tvb, offset);
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|
|
2001-12-10 00:26:21 +00:00
|
|
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if (check_col(pinfo->cinfo, COL_INFO)) {
|
2002-05-24 22:50:55 +00:00
|
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Block: %i%s",
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blocknum,
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(bytes < 512)?" (last)":"" );
|
2001-11-03 02:19:10 +00:00
|
|
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}
|
2000-11-10 09:17:10 +00:00
|
|
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|
2003-12-24 10:48:13 +00:00
|
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if (bytes != 0) {
|
|
|
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if (tree) {
|
|
|
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proto_tree_add_text(tftp_tree, tvb, offset, -1,
|
2002-05-24 22:50:55 +00:00
|
|
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"Data (%d bytes)", bytes);
|
2003-12-24 10:48:13 +00:00
|
|
|
}
|
2001-11-03 02:19:10 +00:00
|
|
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}
|
|
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|
break;
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|
|
|
|
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|
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case TFTP_ACK:
|
2002-05-24 22:50:55 +00:00
|
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|
blocknum = tvb_get_ntohs(tvb, offset);
|
2001-11-03 02:19:10 +00:00
|
|
|
if (tree) {
|
2002-05-24 22:50:55 +00:00
|
|
|
proto_tree_add_uint(tftp_tree, hf_tftp_blocknum, tvb, offset, 2,
|
|
|
|
blocknum);
|
2001-11-03 02:19:10 +00:00
|
|
|
}
|
2001-12-10 00:26:21 +00:00
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Block: %i",
|
2002-05-24 22:50:55 +00:00
|
|
|
blocknum);
|
2001-11-03 02:19:10 +00:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case TFTP_ERROR:
|
2001-11-03 02:25:26 +00:00
|
|
|
error = tvb_get_ntohs(tvb, offset);
|
2001-11-03 02:19:10 +00:00
|
|
|
if (tree) {
|
2001-11-03 02:25:26 +00:00
|
|
|
proto_tree_add_uint(tftp_tree, hf_tftp_error_code, tvb, offset, 2,
|
|
|
|
error);
|
2001-11-03 02:19:10 +00:00
|
|
|
}
|
2001-12-10 00:26:21 +00:00
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Code: %s",
|
2001-11-03 02:25:26 +00:00
|
|
|
val_to_str(error, tftp_error_code_vals, "Unknown (%u)"));
|
2001-11-03 02:19:10 +00:00
|
|
|
}
|
|
|
|
offset += 2;
|
2000-11-10 09:17:10 +00:00
|
|
|
|
2001-11-03 02:25:26 +00:00
|
|
|
i1 = tvb_strsize(tvb, offset);
|
2001-11-03 02:19:10 +00:00
|
|
|
if (tree) {
|
2000-11-10 09:17:10 +00:00
|
|
|
proto_tree_add_item(tftp_tree, hf_tftp_error_string, tvb, offset,
|
2000-12-24 20:33:04 +00:00
|
|
|
i1, FALSE);
|
2001-11-03 02:19:10 +00:00
|
|
|
}
|
2001-12-10 00:26:21 +00:00
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Message: %s",
|
2001-11-03 02:25:26 +00:00
|
|
|
tvb_get_ptr(tvb, offset, i1));
|
|
|
|
}
|
2001-11-03 02:19:10 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case TFTP_OACK:
|
|
|
|
if (tree)
|
2000-11-10 09:17:10 +00:00
|
|
|
tftp_dissect_options(tvb, offset, tftp_tree);
|
2001-11-03 02:19:10 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
|
|
|
if (tree) {
|
2002-01-24 09:20:54 +00:00
|
|
|
proto_tree_add_text(tftp_tree, tvb, offset, -1,
|
|
|
|
"Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
|
1999-02-15 06:36:57 +00:00
|
|
|
}
|
2001-11-03 02:19:10 +00:00
|
|
|
break;
|
1999-02-15 06:36:57 +00:00
|
|
|
|
|
|
|
}
|
|
|
|
}
|
1999-07-29 05:47:07 +00:00
|
|
|
|
2000-11-10 09:17:10 +00:00
|
|
|
static void
|
|
|
|
tftp_dissect_options(tvbuff_t *tvb, int offset, proto_tree *tree)
|
|
|
|
{
|
2000-12-24 20:33:04 +00:00
|
|
|
int option_len, value_len;
|
|
|
|
int value_offset;
|
2000-11-10 09:17:10 +00:00
|
|
|
|
2000-11-13 08:58:17 +00:00
|
|
|
while (tvb_offset_exists(tvb, offset)) {
|
2000-12-25 23:48:16 +00:00
|
|
|
option_len = tvb_strsize(tvb, offset); /* length of option */
|
2000-12-24 20:33:04 +00:00
|
|
|
value_offset = offset + option_len;
|
2000-12-25 23:48:16 +00:00
|
|
|
value_len = tvb_strsize(tvb, value_offset); /* length of value */
|
2000-12-24 20:33:04 +00:00
|
|
|
proto_tree_add_text(tree, tvb, offset, option_len+value_len,
|
2000-12-25 23:48:16 +00:00
|
|
|
"Option: %s = %s",
|
|
|
|
tvb_get_ptr(tvb, offset, option_len),
|
|
|
|
tvb_get_ptr(tvb, value_offset, value_len));
|
2000-12-24 20:33:04 +00:00
|
|
|
offset += option_len + value_len;
|
2000-11-10 09:17:10 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
1999-07-29 05:47:07 +00:00
|
|
|
void
|
|
|
|
proto_register_tftp(void)
|
|
|
|
{
|
1999-11-14 10:32:26 +00:00
|
|
|
static hf_register_info hf[] = {
|
2000-11-10 09:17:10 +00:00
|
|
|
{ &hf_tftp_opcode,
|
|
|
|
{ "Opcode", "tftp.opcode",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(tftp_opcode_vals), 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"TFTP message type", HFILL }},
|
1999-11-14 10:32:26 +00:00
|
|
|
|
2000-11-10 09:17:10 +00:00
|
|
|
{ &hf_tftp_source_file,
|
|
|
|
{ "Source File", "tftp.source_file",
|
|
|
|
FT_STRINGZ, BASE_DEC, NULL, 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"TFTP source file name", HFILL }},
|
2000-11-10 09:17:10 +00:00
|
|
|
|
|
|
|
{ &hf_tftp_destination_file,
|
|
|
|
{ "DESTINATION File", "tftp.destination_file",
|
|
|
|
FT_STRINGZ, BASE_DEC, NULL, 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"TFTP source file name", HFILL }},
|
2000-11-10 09:17:10 +00:00
|
|
|
|
|
|
|
{ &hf_tftp_transfer_type,
|
|
|
|
{ "Type", "tftp.type",
|
|
|
|
FT_STRINGZ, BASE_DEC, NULL, 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"TFTP transfer type", HFILL }},
|
2000-11-10 09:17:10 +00:00
|
|
|
|
|
|
|
{ &hf_tftp_blocknum,
|
|
|
|
{ "Block", "tftp.block",
|
|
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"Block number", HFILL }},
|
2000-11-10 09:17:10 +00:00
|
|
|
|
1999-11-14 10:32:26 +00:00
|
|
|
{ &hf_tftp_error_code,
|
|
|
|
{ "Error code", "tftp.error.code",
|
2000-11-10 09:17:10 +00:00
|
|
|
FT_UINT16, BASE_DEC, VALS(tftp_error_code_vals), 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"Error code in case of TFTP error message", HFILL }},
|
2000-11-10 09:17:10 +00:00
|
|
|
|
|
|
|
{ &hf_tftp_error_string,
|
|
|
|
{ "Error message", "tftp.error.message",
|
|
|
|
FT_STRINGZ, BASE_DEC, NULL, 0x0,
|
2001-06-18 02:18:27 +00:00
|
|
|
"Error string in case of TFTP error message", HFILL }}
|
1999-11-14 10:32:26 +00:00
|
|
|
};
|
1999-11-16 11:44:20 +00:00
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_tftp,
|
|
|
|
};
|
1999-11-14 10:32:26 +00:00
|
|
|
|
2001-01-03 06:56:03 +00:00
|
|
|
proto_tftp = proto_register_protocol("Trivial File Transfer Protocol",
|
|
|
|
"TFTP", "tftp");
|
1999-11-14 10:32:26 +00:00
|
|
|
proto_register_field_array(proto_tftp, hf, array_length(hf));
|
1999-11-16 11:44:20 +00:00
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
2001-11-27 07:13:32 +00:00
|
|
|
|
|
|
|
tftp_handle = create_dissector_handle(dissect_tftp, proto_tftp);
|
1999-07-29 05:47:07 +00:00
|
|
|
}
|
2000-10-21 09:54:12 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_tftp(void)
|
|
|
|
{
|
2001-12-03 04:00:26 +00:00
|
|
|
dissector_add("udp.port", UDP_PORT_TFTP, tftp_handle);
|
2000-10-21 09:54:12 +00:00
|
|
|
}
|