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/* packet-manolito.c
* Routines for Blubster/Piolet Manolito Protocol dissection
* Copyright 2003-2004, Jeff Connelly <shellreef+mp2p@gmail.com>
*
* Official home page: http://openlito.sourceforge.net/
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
void proto_register_manolito(void);
void proto_reg_handoff_manolito(void);
/* Initialize the protocol and registered fields */
static int proto_manolito = -1;
static int hf_manolito_checksum = -1;
static int hf_manolito_seqno = -1;
static int hf_manolito_src = -1;
static int hf_manolito_dest = -1;
static int hf_manolito_options_short = -1;
static int hf_manolito_options = -1;
/* Initialize the subtree pointers */
static gint ett_manolito = -1;
/* Code to actually dissect the packets */
static void
dissect_manolito(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
unsigned int offset;
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *manolito_tree;
const char* packet_type = 0;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MANOLITO");
ti = proto_tree_add_item(tree, proto_manolito, tvb, 0, -1, ENC_NA);
manolito_tree = proto_item_add_subtree(ti, ett_manolito);
/* MANOLITO packet header (network byte order) */
proto_tree_add_item(manolito_tree,
hf_manolito_checksum, tvb, 0, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(manolito_tree,
hf_manolito_seqno, tvb, 4, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(manolito_tree,
hf_manolito_src, tvb, 8, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(manolito_tree,
hf_manolito_dest, tvb, 12, 4, ENC_BIG_ENDIAN);
if (tvb_reported_length(tvb) == 19) {
packet_type = "Ping (truncated)";
proto_tree_add_item(manolito_tree,
hf_manolito_options_short, tvb, 16, 3, ENC_BIG_ENDIAN);
} else {
proto_tree_add_item(manolito_tree,
hf_manolito_options, tvb, 16, 4, ENC_BIG_ENDIAN);
}
if (tvb_reported_length(tvb) <= 20) /* no payload, just headers */
{
col_set_str(pinfo->cinfo, COL_INFO, "Ping");
} else {
offset = 20; /* fields start here */
/* fields format: 2-byte name, optional NULL, 1-byte lenlen, */
/* that many bytes(len or data), for NI,CN,VL is len, more */
/* (that many bytes) data follows; else is raw data. */
do
{
guint16 field_name; /* 16-bit field name */
guint8 dtype; /* data-type */
guint8 length; /* length */
guint8 *data; /* payload */
int start; /* field starting location */
char field_name_str[3]; /* printable name */
const char *longname; /* human-friendly field name */
start = offset;
/* 2-byte field name */
field_name = tvb_get_ntohs(tvb, offset);
offset += 2;
/* Identify the packet based on existing fields */
/* Maybe using the options fields is a better idea...*/
if (field_name == 0x434b) /* CK */
packet_type = "Search Hit";
if (field_name == 0x4e43) /* NC */
packet_type = "User Information";
if (field_name == 0x464e) /* FN - if only field */
packet_type = "Search Query";
if (field_name == 0x4944) /* ID ?? search by CK? */
packet_type = "Search Query (by hash)";
if (field_name == 0x5054) /* PT */
packet_type = "Download Request";
if (field_name == 0x4d45) /* ME */
packet_type = "Chat";
if (tvb_reported_length(tvb) == 20) /* no fields */
packet_type = "Ping";
/* Find the long name of the field */
switch(field_name)
{
case 0x5346: longname = "Shared Files"; break; /* SF */
case 0x534b: longname = "Shared Kilobytes"; break; /* SK */
case 0x4e49: longname = "Network ID"; break; /* NI */
case 0x4e43: longname = "Num. Connections"; break; /* NC */
case 0x4356: longname = "Client Version"; break; /* CV */
case 0x564c: longname = "Velocity"; break; /* VL */
case 0x464e: longname = "Filename"; break; /* FN */
case 0x464c: longname = "File Length"; break; /* FL */
case 0x4252: longname = "Bit Rate"; break; /* BR */
case 0x4643: longname = "Frequency"; break; /* FC */
case 0x5354: longname = "???"; break; /* ST */
case 0x534c: longname = "Song Length (s)"; break; /* SL */
case 0x434b: longname = "Checksum"; break; /* CK */
case 0x4e4e: longname = "Nickname"; break; /* NN */
case 0x434e: longname = "Client Name"; break; /* CN */
case 0x5054: longname = "Port"; break; /* PT */
case 0x484e: longname = "???"; break; /* HN */
case 0x4d45: longname = "Message"; break; /* ME */
case 0x4944: longname = "Identification"; break; /* ID */
case 0x4144: longname = "???"; break; /* AD */
default: longname = "unknown"; break;
}
/* 1-byte data type */
#define MANOLITO_STRING 1
#define MANOLITO_INTEGER 0
dtype = tvb_get_guint8(tvb, offset);
length = tvb_get_guint8(tvb, ++offset);
/*
* Get the payload.
*
* XXX - is the cast necessary? I think the
* "usual arithmetic conversions" should
* widen it past 8 bits, so there shouldn't
* be an overflow.
*/
data = (guint8 *)wmem_alloc(wmem_packet_scope(), (guint)length + 1);
tvb_memcpy(tvb, data, ++offset, length);
offset += length;
/* convert the 16-bit integer field name to a string */
/* XXX: changed this to use g_htons */
field_name_str[0] = g_htons(field_name) & 0x00ff;
field_name_str[1] = (g_htons(field_name) & 0xff00) >> 8;
field_name_str[2] = 0;
if (dtype == MANOLITO_STRING)
{
data[length] = 0;
proto_tree_add_text(manolito_tree, tvb, start,
offset - start, "%s (%s): %s",
(char*)field_name_str, longname, data);
} else if (dtype == MANOLITO_INTEGER) {
int n = 0;
/* integers can be up to 5 bytes */
switch(length)
{
case 5: n += data[4] << ((length - 5) * 8);
case 4: n += data[3] << ((length - 4) * 8);
case 3: n += data[2] << ((length - 3) * 8);
case 2: n += data[1] << ((length - 2) * 8);
case 1: n += data[0] << ((length - 1) * 8);
}
proto_tree_add_text(manolito_tree, tvb, start,
offset - start, "%s (%s): %d",
(char*)field_name_str, longname, n);
} else {
proto_tree_add_text(manolito_tree, tvb, start,
offset - start, "unknown type %d", dtype);
}
} while(offset < tvb_reported_length(tvb));
}
if (packet_type)
{
col_set_str(pinfo->cinfo, COL_INFO, packet_type);
}
}
/* Register the protocol with Wireshark */
void
proto_register_manolito(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_manolito_checksum,
{ "Checksum", "manolito.checksum",
FT_UINT32, BASE_HEX, NULL, 0,
"Checksum used for verifying integrity", HFILL }
},
{ &hf_manolito_seqno,
{ "Sequence Number", "manolito.seqno",
FT_UINT32, BASE_HEX, NULL, 0,
"Incremental sequence number", HFILL }
},
{ &hf_manolito_src,
{ "Forwarded IP Address", "manolito.src",
FT_IPv4, BASE_NONE, NULL, 0,
"Host packet was forwarded from (or 0)", HFILL }
},
{ &hf_manolito_dest,
{ "Destination IP Address","manolito.dest",
FT_IPv4, BASE_NONE, NULL, 0,
"Destination IPv4 address", HFILL }
},
{ &hf_manolito_options_short,
{ "Options", "manolito.options",
FT_UINT24, BASE_HEX, NULL, 0,
"Packet-dependent data", HFILL }
},
{ &hf_manolito_options,
{ "Options", "manolito.options",
FT_UINT32, BASE_HEX, NULL, 0,
"Packet-dependent data", HFILL }
},
};
static gint *ett[] = {
&ett_manolito,
};
proto_manolito = proto_register_protocol("Blubster/Piolet MANOLITO Protocol",
"Manolito", "manolito");
proto_register_field_array(proto_manolito, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_manolito(void)
{
dissector_handle_t manolito_handle;
manolito_handle = create_dissector_handle(dissect_manolito,
proto_manolito);
dissector_add_uint("udp.port", 41170, manolito_handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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