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/* packet-cops.c
* Routines for the COPS (Common Open Policy Service) protocol dissection
* RFC2748
*
* Copyright 2000, Heikki Vatiainen <hessu@cs.tut.fi>
*
* $Id: packet-cops.c,v 1.4 2000/08/13 14:08:07 deniel Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "packet.h"
#define TCP_PORT_COPS 3288
#define COPS_OBJECT_HDR_SIZE 4
static const value_string cops_flags_vals[] = {
{ 0x00, "None" },
{ 0x01, "Solicited Message Flag Bit" },
{ 0, NULL },
};
/* The different COPS message types */
enum cops_op_code {
COPS_NO_MSG, /* Not a COPS Message type */
COPS_MSG_REQ, /* Request (REQ) */
COPS_MSG_DEC, /* Decision (DEC) */
COPS_MSG_RPT, /* Report State (RPT) */
COPS_MSG_DRQ, /* Delete Request State (DRQ) */
COPS_MSG_SSQ, /* Synchronize State Req (SSQ) */
COPS_MSG_OPN, /* Client-Open (OPN) */
COPS_MSG_CAT, /* Client-Accept (CAT) */
COPS_MSG_CC, /* Client-Close (CC) */
COPS_MSG_KA, /* Keep-Alive (KA) */
COPS_MSG_SSC, /* Synchronize Complete (SSC) */
COPS_LAST_OP_CODE /* For error checking */
};
static const value_string cops_op_code_vals[] = {
{ COPS_MSG_REQ, "Request (REQ)" },
{ COPS_MSG_DEC, "Decision (DEC)" },
{ COPS_MSG_RPT, "Report State (RPT)" },
{ COPS_MSG_DRQ, "Delete Request State (DRQ)" },
{ COPS_MSG_SSQ, "Synchronize State Req (SSQ)" },
{ COPS_MSG_OPN, "Client-Open (OPN)" },
{ COPS_MSG_CAT, "Client-Accept (CAT)" },
{ COPS_MSG_CC, "Client-Close (CC)" },
{ COPS_MSG_KA, "Keep-Alive (KA)" },
{ COPS_MSG_SSC, "Synchronize Complete (SSC)" },
{ 0, NULL },
};
/* The different objects in COPS messages */
enum cops_c_num {
COPS_NO_OBJECT, /* Not a COPS Object type */
COPS_OBJ_HANDLE, /* Handle Object (Handle) */
COPS_OBJ_CONTEXT, /* Context Object (Context) */
COPS_OBJ_IN_INT, /* In-Interface Object (IN-Int) */
COPS_OBJ_OUT_INT, /* Out-Interface Object (OUT-Int) */
COPS_OBJ_REASON, /* Reason Object (Reason) */
COPS_OBJ_DECISION, /* Decision Object (Decision) */
COPS_OBJ_LPDPDECISION, /* LPDP Decision Object (LPDPDecision) */
COPS_OBJ_ERROR, /* Error Object (Error) */
COPS_OBJ_CLIENTSI, /* Client Specific Information Object (ClientSI) */
COPS_OBJ_KATIMER, /* Keep-Alive Timer Object (KATimer) */
COPS_OBJ_PEPID, /* PEP Identification Object (PEPID) */
COPS_OBJ_REPORT_TYPE, /* Report-Type Object (Report-Type) */
COPS_OBJ_PDPREDIRADDR, /* PDP Redirect Address Object (PDPRedirAddr) */
COPS_OBJ_LASTPDPADDR, /* Last PDP Address (LastPDPaddr) */
COPS_OBJ_ACCTTIMER, /* Accounting Timer Object (AcctTimer) */
COPS_OBJ_INTEGRITY, /* Message Integrity Object (Integrity) */
COPS_LAST_C_NUM /* For error checking */
};
static const value_string cops_c_num_vals[] = {
{ COPS_OBJ_HANDLE, " Handle Object (Handle)" },
{ COPS_OBJ_CONTEXT, " Context Object (Context)" },
{ COPS_OBJ_IN_INT, " In-Interface Object (IN-Int)" },
{ COPS_OBJ_OUT_INT, " Out-Interface Object (OUT-Int)" },
{ COPS_OBJ_REASON, " Reason Object (Reason)" },
{ COPS_OBJ_DECISION, " Decision Object (Decision)" },
{ COPS_OBJ_LPDPDECISION, " LPDP Decision Object (LPDPDecision)" },
{ COPS_OBJ_ERROR, " Error Object (Error)" },
{ COPS_OBJ_CLIENTSI, " Client Specific Information Object (ClientSI)" },
{ COPS_OBJ_KATIMER, " Keep-Alive Timer Object (KATimer)" },
{ COPS_OBJ_PEPID, " PEP Identification Object (PEPID)" },
{ COPS_OBJ_REPORT_TYPE, " Report-Type Object (Report-Type)" },
{ COPS_OBJ_PDPREDIRADDR, " PDP Redirect Address Object (PDPRedirAddr)" },
{ COPS_OBJ_LASTPDPADDR, " Last PDP Address (LastPDPaddr)" },
{ COPS_OBJ_ACCTTIMER, " Accounting Timer Object (AcctTimer)" },
{ COPS_OBJ_INTEGRITY, " Message Integrity Object (Integrity)" },
{ 0, NULL },
};
/* Initialize the protocol and registered fields */
static gint proto_cops = -1;
static gint hf_cops_ver_flags = -1;
static gint hf_cops_version = -1;
static gint hf_cops_flags = -1;
static gint hf_cops_op_code = -1;
static gint hf_cops_client_type = -1;
static gint hf_cops_msg_len = -1;
static gint hf_cops_obj_len = -1;
static gint hf_cops_obj_c_num = -1;
static gint hf_cops_obj_c_type = -1;
/* Initialize the subtree pointers */
static gint ett_cops = -1;
static gint ett_cops_ver_flags = -1;
static gint ett_cops_obj = -1;
static int dissect_cops_object(tvbuff_t *tvb, guint32 offset, proto_tree *tree);
/* Code to actually dissect the packets */
static void dissect_cops(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 op_code;
CHECK_DISPLAY_AS_DATA(proto_cops, tvb, pinfo, tree);
pinfo->current_proto = "COPS";
if (check_col(pinfo->fd, COL_PROTOCOL))
col_add_str(pinfo->fd, COL_PROTOCOL, "COPS");
op_code = tvb_get_guint8(tvb, 1);
if (check_col(pinfo->fd, COL_INFO))
col_add_fstr(pinfo->fd, COL_INFO, "COPS %s",
val_to_str(op_code, cops_op_code_vals, "Unknown Op Code"));
if (tree) {
proto_item *ti, *tv;
proto_tree *cops_tree, *ver_flags_tree;
guint32 offset, msg_len, carbage;
guint8 ver_flags;
offset = 0;
ti = proto_tree_add_item(tree, proto_cops, tvb, offset, tvb_length(tvb), FALSE);
cops_tree = proto_item_add_subtree(ti, ett_cops);
/* Version and flags share the same byte, put them in a subtree */
ver_flags = tvb_get_guint8(tvb, offset);
tv = proto_tree_add_uint_format(cops_tree, hf_cops_ver_flags, tvb, offset, 1,
ver_flags, "Version: %u, Flags: %s",
hi_nibble(ver_flags),
val_to_str(lo_nibble(ver_flags), cops_flags_vals, "Unknown"));
ver_flags_tree = proto_item_add_subtree(tv, ett_cops_ver_flags);
proto_tree_add_uint(ver_flags_tree, hf_cops_version, tvb, offset, 1, ver_flags);
proto_tree_add_uint(ver_flags_tree, hf_cops_flags, tvb, offset, 1, ver_flags);
offset++;
proto_tree_add_uint(cops_tree, hf_cops_op_code, tvb, offset, 1, tvb_get_guint8(tvb, offset));
offset ++;
proto_tree_add_uint(cops_tree, hf_cops_client_type, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
offset += 2;
msg_len = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint(cops_tree, hf_cops_msg_len, tvb, offset, 4, tvb_get_ntohl(tvb, offset));
offset += 4;
while (msg_len >= COPS_OBJECT_HDR_SIZE) {
int consumed;
consumed = dissect_cops_object(tvb, offset, cops_tree);
if (consumed == 0)
break;
msg_len -= consumed;
offset += consumed;
}
carbage = tvb_length_remaining(tvb, offset);
if (carbage != 0)
proto_tree_add_text(cops_tree, tvb, offset, carbage,
"Trailing carbage: %u byte%s", carbage,
plurality(carbage, "", "s"));
}
return;
}
static int dissect_cops_object(tvbuff_t *tvb, guint32 offset, proto_tree *tree)
{
guint16 object_len, contents_len;
guint8 c_num, c_type;
proto_item *ti;
proto_tree *obj_tree;
if (tvb_length_remaining(tvb, offset) < COPS_OBJECT_HDR_SIZE)
return 0;
object_len = tvb_get_ntohs(tvb, offset);
c_num = tvb_get_guint8(tvb, offset + 2);
c_type = tvb_get_guint8(tvb, offset + 3);
ti = proto_tree_add_uint_format(tree, hf_cops_obj_c_num, tvb, offset, object_len, c_num,
"Object Type: %s", val_to_str(c_num, cops_c_num_vals, "Unknown"));
obj_tree = proto_item_add_subtree(ti, ett_cops_obj);
proto_tree_add_uint(obj_tree, hf_cops_obj_len, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
offset += 2;
proto_tree_add_uint(obj_tree, hf_cops_obj_c_num, tvb, offset, 1, tvb_get_guint8(tvb, offset));
offset++;
proto_tree_add_uint(obj_tree, hf_cops_obj_c_type, tvb, offset, 1, tvb_get_guint8(tvb, offset));
offset++;
contents_len = object_len - COPS_OBJECT_HDR_SIZE;
proto_tree_add_text(obj_tree, tvb, offset, contents_len,
"Object contents: %u bytes", contents_len);
/* Pad to 32bit boundary */
if (object_len % sizeof (guint32))
object_len += (sizeof (guint32) - object_len % sizeof (guint32));
return object_len;
}
/* Register the protocol with Ethereal */
void proto_register_cops(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_cops_ver_flags,
{ "Version and Flags", "cops.ver_flags",
FT_UINT8, BASE_HEX, NULL, 0x0,
"Version and Flags in COPS Common Header" }
},
{ &hf_cops_version,
{ "Version", "cops.version",
FT_UINT8, BASE_DEC, NULL, 0xF0,
"Version in COPS Common Header" }
},
{ &hf_cops_flags,
{ "Flags", "cops.flags",
FT_UINT8, BASE_HEX, VALS(cops_flags_vals), 0x0F,
"Flags in COPS Common Header" }
},
{ &hf_cops_op_code,
{ "Op Code", "cops.op_code",
FT_UINT8, BASE_DEC, VALS(cops_op_code_vals), 0x0,
"Op Code in COPS Common Header" }
},
{ &hf_cops_client_type,
{ "Client Type", "cops.client_type",
FT_UINT16, BASE_DEC, NULL, 0x0,
"Client Type in COPS Common Header" }
},
{ &hf_cops_msg_len,
{ "Message Length", "cops.msg_len",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Message Length in COPS Common Header" }
},
{ &hf_cops_obj_len,
{ "Object Length", "cops.obj.len",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Object Length in COPS Object Header" }
},
{ &hf_cops_obj_c_num,
{ "C-Num", "cops.obj.c_num",
FT_UINT8, BASE_DEC, VALS(cops_c_num_vals), 0x0,
"C-Num in COPS Object Header" }
},
{ &hf_cops_obj_c_type,
{ "C-Type", "cops.obj.c_type",
FT_UINT8, BASE_DEC, NULL, 0x0,
"C-Type in COPS Object Header" }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_cops,
&ett_cops_ver_flags,
&ett_cops_obj,
};
/* Register the protocol name and description */
proto_cops = proto_register_protocol("Common Open Policy Service", "cops");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_cops, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
};
void
proto_reg_handoff_cops(void)
{
dissector_add("tcp.port", TCP_PORT_COPS, dissect_cops);
}
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