forked from osmocom/wireshark
43ccfd8054
"{old_}heur_dissector_add()", "{old_}conv_dissector_add()", and
"register_dissector()", so that an entry in those tables has associated
with it the protocol index of the protocol the dissector handles (or -1,
if there is no protocol index for it).
This is for future use in a number of places.
(Arguably, "proto_register_protocol()" should take a dissector pointer
as an argument, but
1) it'd have to handle both regular and heuristic dissectors;
2) making it take either a "dissector_t" or a union of that and
a "heur_dissector_t" introduces some painful header-file
interdependencies
so I'm punting on that for now. As with other Ethereal internal APIs,
these APIs are subject to change in the future, at least until Ethereal
1.0 comes out....)
svn path=/trunk/; revision=2849
284 lines
7.9 KiB
C
284 lines
7.9 KiB
C
/* 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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* Craig Newell <CraigN@cheque.uq.edu.au>
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* RFC2347 TFTP Option Extension
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*
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* $Id: packet-tftp.c,v 1.23 2001/01/09 06:31:44 guy Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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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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*
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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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#include "conversation.h"
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static int proto_tftp = -1;
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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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static int hf_tftp_error_code = -1;
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static int hf_tftp_error_string = -1;
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static gint ett_tftp = -1;
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#define UDP_PORT_TFTP 69
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#define RRQ 1
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#define WRQ 2
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#define DATA 3
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#define ACK 4
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#define ERROR 5
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#define OACK 6
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static const value_string tftp_opcode_vals[] = {
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{ RRQ, "Read Request" },
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{ WRQ, "Write Request" },
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{ DATA, "Data Packet" },
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{ ACK, "Acknowledgement" },
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{ ERROR, "Error Code" },
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{ OACK, "Option Acknowledgement" },
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{ 0, NULL }
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};
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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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{ 0, NULL }
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};
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static void tftp_dissect_options(tvbuff_t *tvb, int offset, proto_tree *tree);
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static void
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dissect_tftp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *tftp_tree;
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proto_item *ti;
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conversation_t *conversation;
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gint offset = 0;
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guint16 opcode;
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u_int i1;
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CHECK_DISPLAY_AS_DATA(proto_tftp, tvb, pinfo, tree);
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pinfo->current_proto = "TFTP";
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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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* there's already a conversation with the source IP address
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* and port of this packet, the destination IP address of this
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* packet, and any destination UDP port. If not, we create
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* one, with a wildcard UDP port, and give it the TFTP dissector
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* as a dissector.
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*/
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if (pinfo->destport == UDP_PORT_TFTP) {
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conversation = find_conversation(&pinfo->src, &pinfo->dst, PT_UDP,
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pinfo->srcport, 0, NO_DST_PORT);
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if (conversation == NULL) {
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conversation = conversation_new(&pinfo->src, &pinfo->dst, PT_UDP,
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pinfo->srcport, 0, NULL,
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NO_DST_PORT);
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conversation_set_dissector(conversation, dissect_tftp);
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}
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}
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_set_str(pinfo->fd, COL_PROTOCOL, "TFTP");
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opcode = tvb_get_ntohs(tvb, offset);
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if (check_col(pinfo->fd, COL_INFO)) {
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col_add_fstr(pinfo->fd, COL_INFO, "TFTP %s",
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val_to_str(opcode, tftp_opcode_vals, "Unknown (0x%04x)"));
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tftp, tvb, offset,
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tvb_length_remaining(tvb, offset), FALSE);
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tftp_tree = proto_item_add_subtree(ti, ett_tftp);
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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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offset += 2;
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switch (opcode) {
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case RRQ:
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i1 = tvb_strsize(tvb, offset);
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proto_tree_add_item(tftp_tree, hf_tftp_source_file,
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tvb, offset, i1, FALSE);
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offset += i1;
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i1 = tvb_strsize(tvb, offset);
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ti = proto_tree_add_item(tftp_tree, hf_tftp_transfer_type,
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tvb, offset, i1, FALSE);
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offset += i1;
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tftp_dissect_options(tvb, offset, tftp_tree);
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break;
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case WRQ:
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i1 = tvb_strsize(tvb, offset);
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proto_tree_add_item(tftp_tree, hf_tftp_destination_file,
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tvb, offset, i1, FALSE);
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offset += i1;
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i1 = tvb_strsize(tvb, offset);
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ti = proto_tree_add_item(tftp_tree, hf_tftp_transfer_type,
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tvb, offset, i1, FALSE);
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offset += i1;
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tftp_dissect_options(tvb, offset, tftp_tree);
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break;
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case DATA:
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proto_tree_add_item(tftp_tree, hf_tftp_blocknum, tvb, offset, 2,
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FALSE);
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offset += 2;
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proto_tree_add_text(tftp_tree, tvb, offset, tvb_length_remaining(tvb, offset),
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"Data (%d bytes)", tvb_length_remaining(tvb, offset));
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break;
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case ACK:
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proto_tree_add_item(tftp_tree, hf_tftp_blocknum, tvb, offset, 2,
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FALSE);
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break;
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case ERROR:
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proto_tree_add_item(tftp_tree, hf_tftp_error_code, tvb, offset, 2,
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FALSE);
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offset += 2;
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i1 = tvb_strsize(tvb, offset);
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proto_tree_add_item(tftp_tree, hf_tftp_error_string, tvb, offset,
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i1, FALSE);
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break;
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case OACK:
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tftp_dissect_options(tvb, offset, tftp_tree);
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break;
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default:
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proto_tree_add_text(tftp_tree, tvb, offset, tvb_length_remaining(tvb, offset),
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"Data (%d bytes)", tvb_length_remaining(tvb, offset));
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break;
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}
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}
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}
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static void
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tftp_dissect_options(tvbuff_t *tvb, int offset, proto_tree *tree)
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{
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int option_len, value_len;
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int value_offset;
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while (tvb_offset_exists(tvb, offset)) {
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option_len = tvb_strsize(tvb, offset); /* length of option */
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value_offset = offset + option_len;
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value_len = tvb_strsize(tvb, value_offset); /* length of value */
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proto_tree_add_text(tree, tvb, offset, option_len+value_len,
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"Option: %s = %s",
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tvb_get_ptr(tvb, offset, option_len),
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tvb_get_ptr(tvb, value_offset, value_len));
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offset += option_len + value_len;
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}
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}
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void
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proto_register_tftp(void)
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{
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static hf_register_info hf[] = {
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{ &hf_tftp_opcode,
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{ "Opcode", "tftp.opcode",
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FT_UINT16, BASE_DEC, VALS(tftp_opcode_vals), 0x0,
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"TFTP message type" }},
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{ &hf_tftp_source_file,
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{ "Source File", "tftp.source_file",
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FT_STRINGZ, BASE_DEC, NULL, 0x0,
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"TFTP source file name" }},
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{ &hf_tftp_destination_file,
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{ "DESTINATION File", "tftp.destination_file",
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FT_STRINGZ, BASE_DEC, NULL, 0x0,
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"TFTP source file name" }},
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{ &hf_tftp_transfer_type,
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{ "Type", "tftp.type",
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FT_STRINGZ, BASE_DEC, NULL, 0x0,
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"TFTP transfer type" }},
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{ &hf_tftp_blocknum,
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{ "Block", "tftp.block",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Block number" }},
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{ &hf_tftp_error_code,
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{ "Error code", "tftp.error.code",
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FT_UINT16, BASE_DEC, VALS(tftp_error_code_vals), 0x0,
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"Error code in case of TFTP error message" }},
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{ &hf_tftp_error_string,
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{ "Error message", "tftp.error.message",
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FT_STRINGZ, BASE_DEC, NULL, 0x0,
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"Error string in case of TFTP error message" }}
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};
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static gint *ett[] = {
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&ett_tftp,
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};
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proto_tftp = proto_register_protocol("Trivial File Transfer Protocol",
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"TFTP", "tftp");
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proto_register_field_array(proto_tftp, 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_tftp(void)
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{
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dissector_add("udp.port", UDP_PORT_TFTP, dissect_tftp, proto_tftp);
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}
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