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/* packet-kismet.c
* Routines for kismet packet dissection
* Copyright 2006, Krzysztof Burghardt <krzysztof@burghardt.pl>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/strutil.h>
#include <epan/prefs.h>
static int proto_kismet = -1;
static int hf_kismet_response = -1;
static int hf_kismet_request = -1;
static gint ett_kismet = -1;
static gint ett_kismet_reqresp = -1;
static dissector_handle_t data_handle;
#define TCP_PORT_KISMET 2501
static guint global_kismet_tcp_port = TCP_PORT_KISMET;
static gboolean response_is_continuation(const guchar * data);
void proto_reg_handoff_kismet(void);
void proto_register_kismet(void);
static gboolean
dissect_kismet(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
{
gboolean is_request;
gboolean is_continuation;
proto_tree *kismet_tree=NULL, *reqresp_tree=NULL;
proto_item *ti;
proto_item *tmp_item;
gint offset = 0;
const guchar *line;
gint next_offset;
int linelen;
int tokenlen;
int i;
const guchar *next_token;
/*
* 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);
/*
* Check if it is an ASCII based protocol with reasonable length
* packets, if not return, and try annother dissector.
*/
if (linelen < 8) {
/*
* Packet is too short
*/
return FALSE;
} else {
for (i = 0; i < 8; ++i) {
/*
* Packet contains non-ASCII data
*/
if (line[i] < 32 || line[i] > 128)
return FALSE;
}
}
/*
* If it is Kismet traffic set COL_PROTOCOL.
*/
col_set_str(pinfo->cinfo, COL_PROTOCOL, "kismet");
/*
* Check if it is request, reply or continuation.
*/
if (pinfo->match_port == pinfo->destport) {
is_request = TRUE;
is_continuation = FALSE;
} else {
is_request = FALSE;
is_continuation = response_is_continuation (line);
}
if (check_col(pinfo->cinfo, COL_INFO)) {
/*
* Put the first line from the buffer into the summary
* if it's a kismet request or reply (but leave out the
* line terminator).
* Otherwise, just call it a continuation.
*/
if (is_continuation)
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
else
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
is_request ? "Request" : "Response",
format_text(line, linelen));
}
if (tree) {
ti = proto_tree_add_item(tree, proto_kismet, tvb, offset, -1, FALSE);
kismet_tree = proto_item_add_subtree(ti, ett_kismet);
}
if (is_continuation) {
/*
* Put the whole packet into the tree as data.
*/
call_dissector(data_handle, tvb, pinfo, kismet_tree);
return TRUE;
}
if (is_request) {
tmp_item = proto_tree_add_boolean(kismet_tree,
hf_kismet_request, tvb, 0, 0, TRUE);
} else {
tmp_item = proto_tree_add_boolean(kismet_tree,
hf_kismet_response, tvb, 0, 0, TRUE);
}
PROTO_ITEM_SET_GENERATED (tmp_item);
while (tvb_offset_exists(tvb, offset)) {
/*
* Find the end of the line.
*/
linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE);
if (linelen) {
/*
* Put this line.
*/
ti = proto_tree_add_text(kismet_tree, tvb, offset,
next_offset - offset, "%s",
tvb_format_text(tvb, offset,
next_offset - offset - 1));
reqresp_tree = proto_item_add_subtree(ti, ett_kismet_reqresp);
tokenlen = get_token_len(line, line + linelen, &next_token);
if (tokenlen != 0) {
guint8 *reqresp;
reqresp = tvb_get_ephemeral_string(tvb, offset, tokenlen);
if (is_request) {
/*
* No request dissection
*/
} else {
/*
* *KISMET: {Version} {Start time} \001{Server name}\001 {Build Revision}
* two fields left undocumented: {???} {?ExtendedVersion?}
*/
if (!strncmp(reqresp, "*KISMET", 7)) {
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Kismet version: %s",
format_text(line, tokenlen));
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Start time: %s",
format_text(line, tokenlen));
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Server name: %s",
format_text(line + 1, tokenlen - 2));
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Build revision: %s",
format_text(line, tokenlen));
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Unknown field: %s",
format_text(line, tokenlen));
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen,
"Extended version string: %s",
format_text(line, tokenlen));
}
/*
* *TIME: {Time}
*/
if (!strncmp(reqresp, "*TIME", 5)) {
time_t t;
char *ptr;
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
tokenlen = get_token_len(line, line + linelen, &next_token);
/*
* Convert form ascii to time_t
*/
t = atoi(format_text (line, tokenlen));
/*
* Format ascii representaion of time
*/
ptr = abs_time_secs_to_str(t, FALSE);
proto_tree_add_text(reqresp_tree, tvb, offset,
tokenlen, "Time: %s", ptr);
}
}
offset += (gint) (next_token - line);
linelen -= (int) (next_token - line);
line = next_token;
}
}
offset = next_offset;
}
return TRUE;
}
static gboolean
response_is_continuation(const guchar * data)
{
if (!strncmp(data, "*", 1))
return FALSE;
if (!strncmp(data, "!", 1))
return FALSE;
return TRUE;
}
void
proto_register_kismet(void)
{
static hf_register_info hf[] = {
{&hf_kismet_response,
{"Response", "kismet.response", FT_BOOLEAN, BASE_NONE,
NULL, 0x0, "TRUE if kismet response", HFILL}},
{&hf_kismet_request,
{"Request", "kismet.request", FT_BOOLEAN, BASE_NONE,
NULL, 0x0, "TRUE if kismet request", HFILL}}
};
static gint *ett[] = {
&ett_kismet,
&ett_kismet_reqresp,
};
module_t *kismet_module;
proto_kismet = proto_register_protocol("Kismet Client/Server Protocol", "Kismet", "kismet");
proto_register_field_array(proto_kismet, hf, array_length (hf));
proto_register_subtree_array(ett, array_length (ett));
/* Register our configuration options for Kismet, particularly our port */
kismet_module = prefs_register_protocol(proto_kismet, proto_reg_handoff_kismet);
prefs_register_uint_preference(kismet_module, "tcp.port",
"Kismet Server TCP Port",
"Set the port for Kismet Client/Server messages (if other"
" than the default of 2501)", 10,
&global_kismet_tcp_port);
}
void
proto_reg_handoff_kismet(void)
{
static gboolean kismet_prefs_initialized = FALSE;
static dissector_handle_t kismet_handle;
static guint tcp_port;
if (!kismet_prefs_initialized) {
kismet_handle = new_create_dissector_handle(dissect_kismet, proto_kismet);
data_handle = find_dissector("data");
kismet_prefs_initialized = TRUE;
} else {
dissector_delete("tcp.port", tcp_port, kismet_handle);
}
/* Set our port number for future use */
tcp_port = global_kismet_tcp_port;
dissector_add("tcp.port", global_kismet_tcp_port, kismet_handle);
}
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