305748ea57
svn path=/trunk/; revision=34542
359 lines
10 KiB
C
359 lines
10 KiB
C
/* packet-xcsl.c
|
|
*
|
|
* Routines for the Xcsl dissection (Call Specification Language)
|
|
*
|
|
* Copyright 2008, Dick Gooris (gooris@alcatel-lucent.com)
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include "config.h"
|
|
#endif
|
|
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <glib.h>
|
|
|
|
#include <epan/packet.h>
|
|
|
|
/* Pre definitions */
|
|
void proto_reg_handoff_xcsl(void);
|
|
|
|
/* string array size */
|
|
#define MAXLEN 4096
|
|
|
|
/* Initialize the protocol and registered fields */
|
|
static int proto_xcsl = -1;
|
|
static int hf_xcsl_protocol_version = -1;
|
|
static int hf_xcsl_transaction_id = -1;
|
|
static int hf_xcsl_command = -1;
|
|
static int hf_xcsl_result = -1;
|
|
static int hf_xcsl_information = -1;
|
|
static int hf_xcsl_parameter = -1;
|
|
|
|
/* Initialize the subtree pointers */
|
|
static gint ett_xcsl = -1;
|
|
|
|
/* Xcsl result codes */
|
|
#define XCSL_SUCCESS 0
|
|
#define XCSL_UNKNOWN 1
|
|
#define XCSL_USRUNKN 2
|
|
#define XCSL_ERROR 3
|
|
#define XCSL_BUSY 4
|
|
#define XCSL_UNDEFINED 5
|
|
#define XCSL_MORE 6
|
|
#define XCSL_MAINT 7
|
|
#define XCSL_PROTSEQERR 8
|
|
#define XCSL_NONE 9
|
|
|
|
/* Result code meanings. See function match_strval() for usage */
|
|
static const value_string xcsl_action_vals[] = {
|
|
{ XCSL_SUCCESS, "Success" },
|
|
{ XCSL_UNKNOWN, "Unknown" },
|
|
{ XCSL_USRUNKN, "User unknown" },
|
|
{ XCSL_ERROR, "Error" },
|
|
{ XCSL_BUSY, "Busy" },
|
|
{ XCSL_UNDEFINED, "Undefined" },
|
|
{ XCSL_MORE, "More" },
|
|
{ XCSL_MAINT, "Maintenance" },
|
|
{ XCSL_PROTSEQERR, "Protocol Sequence Error" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
/* This routine gets the next item from the ';' separated list */
|
|
static gboolean get_next_item(tvbuff_t *tvb, gint offset, gint maxlen, guint8 *str, gint *next_offset, guint *len)
|
|
{
|
|
guint idx = 0;
|
|
guint8 ch;
|
|
|
|
/* Obtain items */
|
|
while (maxlen > 1) {
|
|
ch = tvb_get_guint8(tvb, offset+idx);
|
|
if (ch == ';' || ch == '\r' || ch == '\n')
|
|
break;
|
|
/* Array protect */
|
|
if (idx==MAXLEN) {
|
|
*next_offset = offset + idx;
|
|
*len = idx;
|
|
return FALSE;
|
|
}
|
|
/* Copy data into string array */
|
|
str[idx++] = ch;
|
|
maxlen--;
|
|
}
|
|
/* Null terminate the item */
|
|
str[idx] = '\0';
|
|
|
|
/* Update admin for next item */
|
|
*next_offset = offset + idx;
|
|
*len = idx;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Dissector for xcsl */
|
|
static void dissect_xcsl_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
|
|
|
|
guint offset = 0;
|
|
gint length_remaining;
|
|
guint8 idx;
|
|
gboolean request;
|
|
guint8 par;
|
|
guint8 str[MAXLEN];
|
|
guint8 result;
|
|
const gchar *code;
|
|
guint len;
|
|
gint next_offset;
|
|
proto_item *xcsl_item = NULL;
|
|
proto_tree *xcsl_tree = NULL;
|
|
|
|
/* color support */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Xcsl");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
/* Create display tree for the xcsl protocol */
|
|
if (tree) {
|
|
xcsl_item = proto_tree_add_item(tree, proto_xcsl,tvb, offset, -1, FALSE);
|
|
xcsl_tree = proto_item_add_subtree(xcsl_item, ett_xcsl);
|
|
}
|
|
|
|
/* reset idx */
|
|
idx = 0;
|
|
|
|
/* reset the parameter count */
|
|
par = 0;
|
|
|
|
/* switch whether it concerns a command or an answer */
|
|
request = FALSE;
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
|
|
length_remaining = tvb_ensure_length_remaining(tvb, offset);
|
|
if ( length_remaining == -1 ) {
|
|
return;
|
|
}
|
|
|
|
/* get next item */
|
|
if (!(get_next_item(tvb, offset, length_remaining, str, &next_offset, &len))) {
|
|
/* do not continue when get_next_item returns false */
|
|
return;
|
|
}
|
|
|
|
/* do not add to the tree when the string is of zero length */
|
|
if ( strlen(str) == 0 ) {
|
|
offset = next_offset + 1;
|
|
continue;
|
|
}
|
|
|
|
/* Xcsl (Call Specification Language) protocol in brief :
|
|
*
|
|
* Request :
|
|
*
|
|
* <xcsl-version>;<transaction-id>;<command>;[parameter1;parameter2;parameter3;....]
|
|
*
|
|
* Reply :
|
|
*
|
|
* <xcsl-version>;transaction-id;<result>;[answer data;answer data];...
|
|
*
|
|
* If result is one or more digits, this is determined as a Reply.
|
|
*
|
|
* Example :
|
|
*
|
|
* --> xcsl-1.0;1000;offhook;+31356871234
|
|
* <-- xcsl-1.0;1000;0 <- success
|
|
*
|
|
* --> xcsl-1.0;1001;dial;+31356871234;+31356875678
|
|
* <-- xcsl-1.0;1001;0 <- success
|
|
*
|
|
*
|
|
* index : 0 1 2 3 4
|
|
*
|
|
* Index 2 represents the return code (see the xcsl_action_vals[] definitions)
|
|
*
|
|
*/
|
|
|
|
/* One by one go through each item ';' separated */
|
|
switch (idx) {
|
|
|
|
/* This is the protocol item */
|
|
case 0: proto_tree_add_item(tree, hf_xcsl_protocol_version, tvb, offset, len, FALSE);
|
|
break;
|
|
|
|
/* This should be the transaction ID, if non-digit, it is treated as info */
|
|
case 1: if ( isdigit(str[0]) ) {
|
|
proto_tree_add_item(tree, hf_xcsl_transaction_id, tvb, offset, len, FALSE);
|
|
} else {
|
|
proto_tree_add_item(tree, hf_xcsl_information, tvb, offset, len, FALSE);
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "%s ",str);
|
|
break;
|
|
|
|
/* Starting with non-digit -> Command, if it starts with a digit -> reply */
|
|
case 2: if ( isdigit(str[0]) ) {
|
|
|
|
request = FALSE;
|
|
result = atoi(str);
|
|
if ( result >= XCSL_NONE ) {
|
|
result = XCSL_UNDEFINED;
|
|
}
|
|
code = match_strval(result, xcsl_action_vals);
|
|
|
|
/* Print result code and description */
|
|
xcsl_item = proto_tree_add_item(tree, hf_xcsl_result, tvb, offset, len, FALSE);
|
|
proto_item_append_text(xcsl_item, " (%s)", code);
|
|
|
|
if (result != 0 && check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "[%s] ", code);
|
|
|
|
} else {
|
|
|
|
request = TRUE;
|
|
proto_tree_add_item(tree, hf_xcsl_command, tvb, offset, len, FALSE);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", str);
|
|
|
|
}
|
|
break;
|
|
|
|
/* This is a command parameter */
|
|
default: proto_tree_add_item(tree, hf_xcsl_parameter, tvb, offset, len, FALSE);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
if ( request == TRUE ) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ": %s ",str);
|
|
} else {
|
|
if (par == 0) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "reply: %s ",str);
|
|
} else {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ": %s ",str);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* increment the parameter count */
|
|
par++;
|
|
|
|
break;
|
|
}
|
|
|
|
offset = next_offset + 1;
|
|
idx++;
|
|
|
|
}
|
|
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
/* This function determines whether the first 4 octets equals to xcsl and the fifth is an ; or - */
|
|
static gboolean dissect_xcsl_tcp_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
|
|
|
|
gint offset = 0;
|
|
guint8 *protocol;
|
|
|
|
if (tvb_length_remaining (tvb, offset) >= 5) {
|
|
protocol = tvb_get_ephemeral_string(tvb, offset, 5);
|
|
|
|
if (strncmp(protocol,"xcsl",4) == 0 && (protocol[4] == ';' || protocol[4] == '-')) {
|
|
|
|
/* Disssect it as being an xcsl message */
|
|
dissect_xcsl_tcp(tvb, pinfo, tree);
|
|
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
/* register the various xcsl protocol filters */
|
|
void proto_register_xcsl(void) {
|
|
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_xcsl_protocol_version,
|
|
{ "Protocol Version", "xcsl.protocol_version",
|
|
FT_STRING, BASE_NONE,NULL,0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_xcsl_transaction_id,
|
|
{ "Transaction ID", "xcsl.transacion_id",
|
|
FT_STRING, BASE_NONE,NULL,0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_xcsl_command,
|
|
{ "Command", "xcsl.command",
|
|
FT_STRING, BASE_NONE,NULL,0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_xcsl_result,
|
|
{ "Result", "xcsl.result",
|
|
FT_STRING, BASE_NONE,NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_xcsl_parameter,
|
|
{ "Parameter", "xcsl.parameter",
|
|
FT_STRING, BASE_NONE,NULL,0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
|
|
{ &hf_xcsl_information,
|
|
{ "Information", "xcsl.information",
|
|
FT_STRING, BASE_NONE,NULL,0x0,
|
|
NULL, HFILL
|
|
}
|
|
}
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_xcsl
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_xcsl = proto_register_protocol("Call Specification Language (Xcsl)", "XCSL", "xcsl");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_xcsl, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
/* In case it concerns TCP, try to match on the xcsl header */
|
|
void proto_reg_handoff_xcsl(void) {
|
|
heur_dissector_add("tcp", dissect_xcsl_tcp_heur, proto_xcsl);
|
|
}
|