aboutsummaryrefslogtreecommitdiffstats
path: root/packet-msn-messenger.c
blob: d372950cb06f99d48ed36a47d97c7587cfda62ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/* packet-msn-messenger.c
 * Routines for MSN Messenger Service packet dissection
 * Copyright 2003, Chris Waters <chris@waters.co.nz>
 *
 * $Id: packet-msn-messenger.c,v 1.3 2003/02/13 23:49:19 jmayer Exp $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-pop.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdio.h>

#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>

/*
 * The now-expired Internet-Draft for the MSN Messenger 1.0 protocol
 * can, as of the time of the writing of this comment, be found at:
 *
 *	http://praya.sourceforge.net/draft-movva-msn-messenger-protocol-00.txt
 *
 *	http://mono.es.gnome.org/imsharp/tutoriales/msn/appendixa.html
 *
 *	http://www.hypothetic.org/docs/msn/ietf_draft.php
 *
 *	http://babble.wundsam.net/docs/protocol-msn-im.txt
 *
 * Note that it's Yet Another FTP-Like Command/Response Protocol,
 * so it arguably should be dissected as such, although you do have
 * to worry about the MSG command, as only the first line of it
 * should be parsed as a command, the rest should be parsed as the
 * message body.  We therefore leave "hf_msnms_command", "tokenlen",
 * and "next_token", even though they're unused, as reminders that
 * this should be done.
 */

static int proto_msnms = -1;
/* static int hf_msnms_command = -1; */

static gint ett_msnms = -1;

static dissector_handle_t data_handle;

#define TCP_PORT_MSNMS			1863

static void
dissect_msnms(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
        proto_tree      *msnms_tree;
	proto_item	*ti;
	gint		offset = 0;
	const guchar	*line;
	gint		next_offset;
	int		linelen;
	/* int		tokenlen; */
	/* const guchar	*next_token; */

	if (check_col(pinfo->cinfo, COL_PROTOCOL))
		col_set_str(pinfo->cinfo, COL_PROTOCOL, "MSNMS");

	/*
	 * Find the end of the first line.
	 *
	 * Note that "tvb_find_line_end()" will return a value that is
	 * not longer than what's in the buffer, so the "tvb_get_ptr()"
	 * call won't throw an exception.
	 */
	linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
	line = tvb_get_ptr(tvb, offset, linelen);


	if (check_col(pinfo->cinfo, COL_INFO)) {
		/*
		 * Put the first line from the buffer into the summary.
		 */
		col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
			    format_text(line, linelen));
	}

	if (tree) {
		ti = proto_tree_add_item(tree, proto_msnms, tvb, offset, -1,
		    FALSE);
		msnms_tree = proto_item_add_subtree(ti, ett_msnms);

		/*
		 * Show the rest of the packet as text,
		 * a line at a time.
		 */
		while (tvb_offset_exists(tvb, offset)) {
			/*
			 * Find the end of the line.
			 */
			linelen = tvb_find_line_end(tvb, offset, -1,
			    &next_offset, FALSE);

			/*
			 * Put this line.
			 */
			proto_tree_add_text(msnms_tree, tvb, offset,
			    next_offset - offset, "%s",
			    tvb_format_text(tvb, offset, next_offset - offset));
			offset = next_offset;
		}
	}
}

void
proto_register_msnms(void)
{
  static gint *ett[] = {
    &ett_msnms,
  };

  proto_msnms = proto_register_protocol("MSN Messenger Service", "MSNMS", "msnms");
  proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_msnms(void)
{
  dissector_handle_t msnms_handle;

  msnms_handle = create_dissector_handle(dissect_msnms, proto_msnms);
  dissector_add("tcp.port", TCP_PORT_MSNMS, msnms_handle);
  data_handle = find_dissector("data");
}