forked from osmocom/wireshark
213 lines
6.0 KiB
C
213 lines
6.0 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 1.10 2000/02/09 17:15:47 gram 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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static int proto_tftp = -1;
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static int hf_tftp_type = -1;
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static int hf_tftp_error_code = -1;
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static gint ett_tftp = -1;
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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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char *tftp_opcodes[8] = {
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"Unknown Request",
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"Read Request",
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"Write Request",
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"Data Packet",
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"Acknowledgement",
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"Error Code",
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"Option Acknowledgement",
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"Unknown Request"
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};
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char *tftp_errors[8] = {
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"Not defined",
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"File not found",
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"Access violation",
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"Disk full or allocation exceeded",
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"Illegal TFTP Operation",
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"Unknown transfer ID",
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"File already exists",
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"No such user"
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};
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void
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dissect_tftp(const u_char *pd, int offset, frame_data *fd, 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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u_int i1;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "TFTP");
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if (check_col(fd, COL_INFO)) {
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i1 = pntohs(&pd[offset]);
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col_add_fstr(fd, COL_INFO, "TFTP %s", i1 <= OACK ? tftp_opcodes[i1 % 8] : "Unknown Request");
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_tftp, offset, END_OF_FRAME, NULL);
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tftp_tree = proto_item_add_subtree(ti, ett_tftp);
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i1 = pntohs(pd+offset);
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proto_tree_add_item_hidden(tftp_tree, hf_tftp_type, offset, 2, i1);
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switch (i1) {
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case RRQ:
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proto_tree_add_text(tftp_tree, offset, 2, "Read Request");
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offset += 2;
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i1 = strlen(pd+offset);
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proto_tree_add_text(tftp_tree, offset, i1+1, "Source File: %s", pd+offset);
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offset += i1 + 1;
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i1 = strlen(pd+offset);
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proto_tree_add_text(tftp_tree, offset, i1+1, "Type: %s",pd+offset);
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offset += i1 + 1;
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while (offset < pi.captured_len) {
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int i2;
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i1 = strlen(pd+offset); /* length of option */
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i2 = strlen(pd+offset+i1+1); /* length of value */
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proto_tree_add_text(tftp_tree, offset, i1+i2+2, "Option: %s = %s",
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pd+offset, pd+offset+i1+1);
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offset += i1 + i2 + 2;
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}
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break;
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case WRQ:
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proto_tree_add_text(tftp_tree, offset, 2, "Write Request");
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offset += 2;
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i1 = strlen(pd+offset);
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proto_tree_add_text(tftp_tree, offset, i1+1, "Destination File: %s", pd+offset);
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offset += i1 + 1;
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i1 = strlen(pd+offset);
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proto_tree_add_text(tftp_tree, offset, i1+1, "Type: %s",pd+offset);
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offset += i1 + 1;
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while (offset < pi.captured_len) {
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int i2;
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i1 = strlen(pd+offset); /* length of option */
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i2 = strlen(pd+offset+i1+1); /* length of value */
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proto_tree_add_text(tftp_tree, offset, i1+i2+2, "Option: %s = %s",
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pd+offset, pd+offset+i1+1);
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offset += i1 + i2 + 2;
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}
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break;
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case DATA:
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proto_tree_add_text(tftp_tree, offset, 2, "Data Packet");
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offset += 2;
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i1 = pntohs(pd+offset);
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proto_tree_add_text(tftp_tree, offset, 2, "Block = %u", i1);
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offset += 2;
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proto_tree_add_text(tftp_tree, offset, END_OF_FRAME,
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"Data (%d bytes)", END_OF_FRAME);
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break;
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case ACK:
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proto_tree_add_text(tftp_tree, offset, 2, "Acknowledgement");
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offset += 2;
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i1 = pntohs(pd+offset);
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proto_tree_add_text(tftp_tree, offset, END_OF_FRAME, "Block = %u", i1);
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break;
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case ERROR:
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proto_tree_add_text(tftp_tree, offset, 2, "Error Code");
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offset += 2;
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i1 = pntohs(pd+offset);
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proto_tree_add_item_hidden(tftp_tree, hf_tftp_error_code, offset, 2, i1);
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proto_tree_add_text(tftp_tree, offset, 2, "Code = %s", tftp_errors[i1 % 8]);
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offset += 2;
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proto_tree_add_text(tftp_tree, offset, END_OF_FRAME, "Error Message: %s", pd + offset);
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break;
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case OACK:
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proto_tree_add_text(tftp_tree, offset, 2, "Option Acknowledgement");
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offset += 2;
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while (offset < pi.captured_len) {
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int i2;
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i1 = strlen(pd+offset); /* length of option */
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i2 = strlen(pd+offset+i1+1); /* length of value */
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proto_tree_add_text(tftp_tree, offset, i1+i2+2, "Option: %s = %s",
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pd+offset, pd+offset+i1+1);
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offset += i1 + i2 + 2;
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}
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break;
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default:
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proto_tree_add_text(tftp_tree, offset, 2, "Unknown TFTP Request: %0X.", i1);
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offset += 2;
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proto_tree_add_text(tftp_tree, offset, END_OF_FRAME,
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"Data (%d bytes)", END_OF_FRAME);
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break;
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}
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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_type,
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{ "Type", "tftp.type",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"TFTP message type" }},
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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, NULL, 0x0,
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"Error code 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", "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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