forked from osmocom/wireshark
143 lines
4.1 KiB
C
143 lines
4.1 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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*
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* $Id: packet-tftp.c,v 1.2 1999/03/23 03:14:44 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@unicom.net>
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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 <arpa/tftp.h>
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#include <glib.h>
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#include "packet.h"
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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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"Unknown Request",
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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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struct tftphdr *tftp_pack = (struct tftphdr *)&pd[offset]; /* Want the hdr */
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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 = ntohs(tftp_pack -> th_opcode);
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col_add_fstr(fd, COL_INFO, "TFTP %s", i1 <= ERROR ? 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, offset, END_OF_FRAME,
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"Trivial File Transfer Protocol");
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tftp_tree = proto_tree_new();
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proto_item_add_subtree(ti, tftp_tree, ETT_TFTP);
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switch (i1 = ntohs(tftp_pack -> th_opcode)) {
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case RRQ:
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proto_tree_add_item(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_item(tftp_tree, offset, i1+1, "Source File: %s", pd+offset);
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offset += i1 + 1;
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proto_tree_add_item(tftp_tree, offset, END_OF_FRAME, "Type: %s",pd+offset);
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break;
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case WRQ:
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proto_tree_add_item(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_item(tftp_tree, offset, i1+1, "Destination File: %s", pd+offset);
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offset += i1 + 1;
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proto_tree_add_item(tftp_tree, offset+2, END_OF_FRAME, "Type: %s",pd+offset);
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break;
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case DATA:
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proto_tree_add_item(tftp_tree, offset, 2, "Data Packet");
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offset += 2;
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i1 = ntohs(*(short *)(pd + offset));
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proto_tree_add_item(tftp_tree, offset, 2, "Block = %u", i1);
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offset += 2;
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proto_tree_add_item(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_item(tftp_tree, offset, 2, "Acknowledgement");
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offset += 2;
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i1 = ntohs(*(short *)(pd + offset));
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proto_tree_add_item(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_item(tftp_tree, offset, 2, "Error Code");
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offset += 2;
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i1 = ntohs(*(short *)(pd + offset));
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proto_tree_add_item(tftp_tree, offset, 2, "Code = %s", tftp_errors[i1 % 8]);
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offset += 2;
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proto_tree_add_item(tftp_tree, offset, END_OF_FRAME, "Error Message: %s", pd + offset);
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break;
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default:
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proto_tree_add_item(tftp_tree, offset, 2, "Unknown TFTP Request: %0X.", i1);
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offset += 2;
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proto_tree_add_item(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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