1999-04-05 21:54:41 +00:00
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/* packet-pop.c
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* Routines for telnet packet dissection
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* Copyright 1999, Richard Sharpe <rsharpe@ns.aus.com>
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*
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1999-04-05 23:39:51 +00:00
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* $Id: packet-telnet.c,v 1.2 1999/04/05 23:39:51 guy Exp $
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1999-04-05 21:54:41 +00:00
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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-pop.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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#include <stdio.h>
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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 <string.h>
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#include <glib.h>
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#include "packet.h"
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#include "etypes.h"
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/* Some defines for Telnet */
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#define TN_IAC 255
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#define TN_DONT 254
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#define TN_DO 253
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#define TN_WONT 252
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#define TN_WILL 251
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#define TN_SB 250
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#define TN_GA 249
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#define TN_EL 248
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#define TN_EC 247
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#define TN_AYT 246
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#define TN_AO 245
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#define TN_IP 244
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#define TN_BRK 243
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#define TN_DM 242
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#define TN_NOP 241
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#define TN_SE 240
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#define TN_EOR 239
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#define TN_ABORT 238
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#define TN_SUSP 237
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#define TN_EOF 236
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char *options[] = {
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"Binary Transmission",
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"Echo",
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"Reconnection",
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"Suppress Go Ahead",
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"Approx Message Size Negotiation",
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"Status",
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"Timing Mark",
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"Remote Controlled Trans and Echo",
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"Output Line Width",
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"Output Page Size",
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"Output Carriage-Return Disposition",
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"Output Horizontal Tab Stops",
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"Output Horizontal Tab Disposition",
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"Output Formfeed Disposition",
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"Output Vertical Tabstops",
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"Output Vertical Tab Disposition",
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"Output Linefeed Disposition",
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"Extended ASCII",
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"Logout",
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"Byte Macro",
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"Data Entry Terminal",
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"SUPDUP",
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"SUPDUP Output",
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"Send Location",
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"Terminal Type",
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"End of Record",
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"TACACS User Identification",
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"Output Marking",
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"Terminal Location Number",
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"Telnet 3270 Regime",
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"X.3 PAD",
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"Negotiate About Window Size",
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"Terminal Speed",
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"Remote Flow Control",
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"Linemode",
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"X Display Location",
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"Environment Option",
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"Authentication Option",
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"Encryption Option",
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"New Environment Option",
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"TN3270E"
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};
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extern packet_info pi;
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void telnet_sub_option(proto_tree *telnet_tree, char *rr, int *i, int offset, int max_data)
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{
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proto_tree *ti, *option_tree;
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int subneg_len, req, si1, not_found = 1;
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volatile int i1;
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char *opt, sub_opt_data[1500];
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memset(sub_opt_data, '\0', sizeof(sub_opt_data));
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/* Figure out the option and type */
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opt = options[(unsigned int)rr[*i]];
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req = (unsigned int)rr[*i + 1];
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i1 = *i + 2; si1 = i1;
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while ((i1 < max_data) && (not_found)) {
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if ((unsigned char)rr[i1] == (unsigned char)TN_IAC)
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not_found = 0;
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else
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i1++;
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}
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subneg_len = i1 - *i + 2;
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ti = proto_tree_add_item(telnet_tree, offset, subneg_len, "Suboption Begin: %s", opt);
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option_tree = proto_tree_new();
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proto_item_add_subtree(ti, option_tree, ETT_TELNET_SUBOPT);
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proto_tree_add_item(option_tree, offset + 2, subneg_len - 2, "%s %s", (req ? "Send your" : "Here's my"), opt);
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if (req == 0) { /* Add the value */
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memcpy(sub_opt_data, rr + *i + 2, subneg_len - 2);
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proto_tree_add_item(option_tree, offset + 4, subneg_len - 4, "Value: %s", format_text(sub_opt_data, subneg_len - 4));
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*i += subneg_len - 2;
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}
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else {
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*i += subneg_len - 2;
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}
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}
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void telnet_command(proto_tree *telnet_tree, char *rr, int *i, int offset, int max_data)
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{
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char *opt;
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switch((unsigned char)rr[*i]) {
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case TN_EOF:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: End of File");
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(*i)++;
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break;
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case TN_SUSP:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Suspend Current Process");
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(*i)++;
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break;
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case TN_ABORT:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Abort Process");
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(*i)++;
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break;
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case TN_EOR:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: End of Record");
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(*i)++;
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break;
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case TN_SE:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Suboption End");
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(*i)++;
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break;
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case TN_NOP:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: No Operation");
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(*i)++;
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break;
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case TN_DM:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Data Mark");
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(*i)++;
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break;
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case TN_BRK:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Break");
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(*i)++;
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break;
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case TN_IP:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Interrupt Process");
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(*i)++;
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break;
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case TN_AO:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Abort Output");
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(*i)++;
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break;
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case TN_AYT:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Are You There?");
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(*i)++;
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break;
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case TN_EC:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Escape Character");
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(*i)++;
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break;
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case TN_EL:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Erase Line");
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(*i)++;
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break;
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case TN_GA:
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proto_tree_add_item(telnet_tree, offset, 2, "Command: Go Ahead");
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(*i)++;
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break;
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case TN_SB:
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(*i)++;
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telnet_sub_option(telnet_tree, rr, i, offset, max_data);
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break;
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case TN_WILL:
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if (rr[*i + 1] > (sizeof(options)/sizeof(char *)))
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opt = "<unknown option>";
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else
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opt = options[(unsigned int)rr[*i + 1]];
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proto_tree_add_item(telnet_tree, offset, 3, "Command: Will %s", opt);
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*i += 2; /* skip two chars */
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break;
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case TN_WONT:
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if (rr[*i + 1] > (sizeof(options)/sizeof(char *)))
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opt = "<unknown option>";
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else
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opt = options[(unsigned int)rr[*i + 1]];
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proto_tree_add_item(telnet_tree, offset, 3, "Command: Won't %s", opt);
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*i += 2; /* skip two chars */
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break;
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case TN_DO:
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if (rr[*i + 1] > (sizeof(options)/sizeof(char *)))
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opt = "<unknown option>";
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else
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opt = options[(unsigned int)rr[*i + 1]];
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proto_tree_add_item(telnet_tree, offset, 3, "Command: Do %s", opt);
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*i += 2; /* skip two chars */
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break;
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case TN_DONT:
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if (rr[*i + 1] > (sizeof(options)/sizeof(char *)))
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opt = "<unknown option>";
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else
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opt = options[(unsigned int)rr[*i + 1]];
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proto_tree_add_item(telnet_tree, offset, 3, "Command: Don't %s", opt);
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*i += 2; /* skip two chars */
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break;
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}
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}
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void
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dissect_telnet(const u_char *pd, int offset, frame_data *fd, proto_tree *tree, int max_data)
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{
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proto_tree *telnet_tree, *ti;
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gchar rr[1500];
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int i1;
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int i2;
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memset(rr, '\0', sizeof(rr));
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "TELNET");
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "Telnet Data ...");
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}
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if (tree) {
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char data[1500];
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int i3;
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memset(data, '\0', sizeof(data));
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memcpy(rr, pd + offset, max_data);
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ti = proto_tree_add_item(tree, offset, END_OF_FRAME,
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"Telnet Protocol");
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telnet_tree = proto_tree_new();
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proto_item_add_subtree(ti, telnet_tree, ETT_TELNET);
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i1 = i2 = i3 = 0;
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while (i1 < max_data) {
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if ((unsigned char)rr[i1] == (unsigned char)TN_IAC) {
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if (strlen(data) > 0) {
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proto_tree_add_item(telnet_tree, offset + i2, strlen(data), "Data: %s", format_text(data, strlen(data)));
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memset(data, '\0', sizeof(data));
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i3 = 0;
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}
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i1++;
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telnet_command(telnet_tree, rr, &i1, offset + i1 - 1, max_data);
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i2 = i1;
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}
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else {
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data[i3] = rr[i1];
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i3++;
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i1++;
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}
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}
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if (strlen(data) > 0) { /* Still some data to add */
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proto_tree_add_item(telnet_tree, offset + i2, strlen(data), "Data: %s", format_text(data, strlen(data)));
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}
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}
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}
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