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wireshark/plugins/profinet/packet-pn-dcp.c

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/* packet-pn-dcp.c
* Routines for PN-DCP (PROFINET Discovery and basic Configuration Protocol)
* packet dissection.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 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
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include <epan/expert.h>
#include <epan/dissectors/packet-dcerpc.h>
#include "packet-pn.h"
static int proto_pn_dcp = -1;
static int hf_pn_dcp_service_id = -1;
static int hf_pn_dcp_service_type = -1;
static int hf_pn_dcp_xid = -1;
static int hf_pn_dcp_reserved8 = -1;
static int hf_pn_dcp_reserved16 = -1;
static int hf_pn_dcp_response_delay = -1;
static int hf_pn_dcp_data_length = -1;
static int hf_pn_dcp_block_length = -1;
static int hf_pn_dcp_block = -1;
static int hf_pn_dcp_block_error = -1;
static int hf_pn_dcp_option = -1;
static int hf_pn_dcp_suboption = -1;
static int hf_pn_dcp_block_info = -1;
static int hf_pn_dcp_block_qualifier = -1;
static int hf_pn_dcp_suboption_ip = -1;
static int hf_pn_dcp_suboption_ip_block_info = -1;
static int hf_pn_dcp_suboption_ip_ip = -1;
static int hf_pn_dcp_suboption_ip_subnetmask = -1;
static int hf_pn_dcp_suboption_ip_standard_gateway = -1;
static int hf_pn_dcp_suboption_device = -1;
static int hf_pn_dcp_suboption_device_typeofstation = -1;
static int hf_pn_dcp_suboption_device_nameofstation = -1;
static int hf_pn_dcp_suboption_vendor_id = -1;
static int hf_pn_dcp_suboption_device_id = -1;
static int hf_pn_dcp_suboption_device_role = -1;
static int hf_pn_dcp_suboption_device_aliasname = -1;
static int hf_pn_dcp_suboption_dhcp = -1;
static int hf_pn_dcp_suboption_dhcp_device_id = -1;
static int hf_pn_dcp_suboption_control = -1;
static int hf_pn_dcp_suboption_control_response = -1;
static int hf_pn_dcp_suboption_deviceinitiative = -1;
static int hf_pn_dcp_deviceinitiative_value = -1;
static int hf_pn_dcp_suboption_all = -1;
static int hf_pn_dcp_suboption_manuf = -1;
static gint ett_pn_dcp = -1;
static gint ett_pn_dcp_block = -1;
#define PNDCP_SERVICE_ID_GET 0x03
#define PNDCP_SERVICE_ID_SET 0x04
#define PNDCP_SERVICE_ID_IDENTIFY 0x05
#define PNDCP_SERVICE_ID_HELLO 0x06
static const value_string pn_dcp_service_id[] = {
{ 0x00, "reserved" },
{ 0x01, "Manufacturer specific" },
{ 0x02, "Manufacturer specific" },
{ PNDCP_SERVICE_ID_GET, "Get" },
{ PNDCP_SERVICE_ID_SET, "Set" },
{ PNDCP_SERVICE_ID_IDENTIFY,"Identify" },
{ PNDCP_SERVICE_ID_HELLO, "Hello" },
/* 0x07 - 0xff reserved */
{ 0, NULL }
};
#define PNDCP_SERVICE_TYPE_REQUEST 0
#define PNDCP_SERVICE_TYPE_RESPONSE_SUCCESS 1
#define PNDCP_SERVICE_TYPE_RESPONSE_UNSUPPORTED 5
static const value_string pn_dcp_service_type[] = {
{ PNDCP_SERVICE_TYPE_REQUEST, "Request" },
{ PNDCP_SERVICE_TYPE_RESPONSE_SUCCESS, "Response Success" },
{ PNDCP_SERVICE_TYPE_RESPONSE_UNSUPPORTED, "Response - Request not supported" },
/* all others reserved */
{ 0, NULL }
};
static const value_string pn_dcp_block_error[] = {
{ 0x00, "Ok" },
{ 0x01, "Option unsupp." },
{ 0x02, "Suboption unsupp. or no DataSet avail." },
{ 0x03, "Suboption not set" },
{ 0x04, "Resource Error" },
{ 0x05, "SET not possible by local reasons" },
{ 0x06, "In operation, SET not possible" },
/* all others reserved */
{ 0, NULL }
};
static const value_string pn_dcp_block_info[] = {
{ 0x0000, "Reserved" },
/*0x0001 - 0xffff reserved */
{ 0, NULL }
};
static const value_string pn_dcp_block_qualifier[] = {
{ 0x0000, "Use the value temporary" },
{ 0x0001, "Save the value permanent" },
/*0x0002 - 0xffff reserved */
{ 0, NULL }
};
#define PNDCP_OPTION_IP 0x01
#define PNDCP_OPTION_DEVICE 0x02
#define PNDCP_OPTION_DHCP 0x03
#define PNDCP_OPTION_RESERVED 0x04
#define PNDCP_OPTION_CONTROL 0x05
#define PNDCP_OPTION_DEVICEINITIATIVE 0x06
#define PNDCP_OPTION_MANUF_X80 0x80
#define PNDCP_OPTION_MANUF_X81 0x81
#define PNDCP_OPTION_MANUF_X82 0x82
#define PNDCP_OPTION_MANUF_X83 0x83
#define PNDCP_OPTION_MANUF_X84 0x84
#define PNDCP_OPTION_MANUF_X85 0x85
#define PNDCP_OPTION_MANUF_X86 0x86
#define PNDCP_OPTION_ALLSELECTOR 0xff
static const value_string pn_dcp_option[] = {
{ 0x00, "reserved" },
{ PNDCP_OPTION_IP, "IP" },
{ PNDCP_OPTION_DEVICE, "Device properties" },
{ PNDCP_OPTION_DHCP, "DHCP" },
{ PNDCP_OPTION_RESERVED, "Reserved" },
{ PNDCP_OPTION_CONTROL, "Control" },
{ PNDCP_OPTION_DEVICEINITIATIVE, "Device Initiative" },
/*0x07 - 0x7f reserved */
/*0x80 - 0xfe manufacturer specific */
{ PNDCP_OPTION_MANUF_X80, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X81, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X82, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X83, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X84, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X85, "Manufacturer specific" },
{ PNDCP_OPTION_MANUF_X86, "Manufacturer specific" },
{ PNDCP_OPTION_ALLSELECTOR, "All Selector" },
{ 0, NULL }
};
#define PNDCP_SUBOPTION_IP_MAC 0x01
#define PNDCP_SUBOPTION_IP_IP 0x02
static const value_string pn_dcp_suboption_ip[] = {
{ 0x00, "Reserved" },
{ PNDCP_SUBOPTION_IP_MAC, "MAC address" },
{ PNDCP_SUBOPTION_IP_IP, "IP parameter" },
/*0x03 - 0xff reserved */
{ 0, NULL }
};
static const value_string pn_dcp_suboption_ip_block_info[] = {
{ 0x0000, "IP not set" },
{ 0x0001, "IP set" },
{ 0x0002, "IP set by DHCP" },
{ 0x0080, "IP not set (address conflict detected)" },
{ 0x0081, "IP set (address conflict detected)" },
{ 0x0082, "IP set by DHCP (address conflict detected)" },
/*0x0003 - 0xffff reserved */
{ 0, NULL }
};
#define PNDCP_SUBOPTION_DEVICE_MANUF 0x01
#define PNDCP_SUBOPTION_DEVICE_NAMEOFSTATION 0x02
#define PNDCP_SUBOPTION_DEVICE_DEV_ID 0x03
#define PNDCP_SUBOPTION_DEVICE_DEV_ROLE 0x04
#define PNDCP_SUBOPTION_DEVICE_DEV_OPTIONS 0x05
#define PNDCP_SUBOPTION_DEVICE_ALIAS_NAME 0x06
static const value_string pn_dcp_suboption_device[] = {
{ 0x00, "Reserved" },
{ PNDCP_SUBOPTION_DEVICE_MANUF, "Manufacturer specific (Type of Station)" },
{ PNDCP_SUBOPTION_DEVICE_NAMEOFSTATION, "Name of Station" },
{ PNDCP_SUBOPTION_DEVICE_DEV_ID, "Device ID" },
{ PNDCP_SUBOPTION_DEVICE_DEV_ROLE, "Device Role" },
{ PNDCP_SUBOPTION_DEVICE_DEV_OPTIONS, "Device Options" },
{ PNDCP_SUBOPTION_DEVICE_ALIAS_NAME, "Alias Name" },
/*0x07 - 0xff reserved */
{ 0, NULL }
};
#define PNDCP_SUBOPTION_DHCP_CLIENT_ID 61
static const value_string pn_dcp_suboption_dhcp[] = {
{ 12, "Host name" },
{ 43, "Vendor specific" },
{ 54, "Server identifier" },
{ 55, "Parameter request list" },
{ 60, "Class identifier" },
{ PNDCP_SUBOPTION_DHCP_CLIENT_ID, "DHCP client identifier" },
{ 81, "FQDN, Fully Qualified Domain Name" },
{ 97, "UUID/GUID-based Client" },
{ 255, "Control DHCP for address resolution" },
/*all others reserved */
{ 0, NULL }
};
#define PNDCP_SUBOPTION_CONTROL_START_TRANS 0x01
#define PNDCP_SUBOPTION_CONTROL_END_TRANS 0x02
#define PNDCP_SUBOPTION_CONTROL_SIGNAL 0x03
#define PNDCP_SUBOPTION_CONTROL_RESPONSE 0x04
#define PNDCP_SUBOPTION_CONTROL_FACT_RESET 0x05
static const value_string pn_dcp_suboption_control[] = {
{ 0x00, "Reserved" },
{ PNDCP_SUBOPTION_CONTROL_START_TRANS, "Start Transaction" },
{ PNDCP_SUBOPTION_CONTROL_END_TRANS, "End Transaction" },
{ PNDCP_SUBOPTION_CONTROL_SIGNAL, "Signal" },
{ PNDCP_SUBOPTION_CONTROL_RESPONSE, "Response" },
{ PNDCP_SUBOPTION_CONTROL_FACT_RESET, "Reset Factory Settings" },
/*0x05 - 0xff reserved */
{ 0, NULL }
};
#define PNDCP_SUBOPTION_DEVICEINITIATIVE 0x01
static const value_string pn_dcp_suboption_deviceinitiative[] = {
{ 0x00, "Reserved" },
{ PNDCP_SUBOPTION_DEVICEINITIATIVE, "Device Initiative" },
/*0x00 - 0xff reserved */
{ 0, NULL }
};
static const value_string pn_dcp_deviceinitiative_value[] = {
{ 0x00, "Device does not issue a DCP-Hello-ReqPDU after power on" },
{ 0x01, "Device does issue a DCP-Hello-ReqPDU after power on" },
/*0x02 - 0xff reserved */
{ 0, NULL }
};
static const value_string pn_dcp_suboption_all[] = {
{ 0xff, "ALL Selector" },
/* all other reserved */
{ 0, NULL }
};
static const value_string pn_dcp_suboption_manuf[] = {
/* none known */
{ 0, NULL }
};
/* dissect the option field */
static int
dissect_PNDCP_Option(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, int hfindex, gboolean append_col)
{
guint8 option;
guint8 suboption;
const value_string *val_str;
offset = dissect_pn_uint8 (tvb, offset, pinfo, tree, hfindex, &option);
switch(option) {
case(PNDCP_OPTION_IP):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_ip, &suboption);
val_str = pn_dcp_suboption_ip;
break;
case(PNDCP_OPTION_DEVICE):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_device, &suboption);
val_str = pn_dcp_suboption_device;
break;
case(PNDCP_OPTION_DHCP):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_dhcp, &suboption);
val_str = pn_dcp_suboption_dhcp;
break;
case(PNDCP_OPTION_CONTROL):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_control, &suboption);
val_str = pn_dcp_suboption_control;
break;
case(PNDCP_OPTION_DEVICEINITIATIVE):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_deviceinitiative, &suboption);
val_str = pn_dcp_suboption_deviceinitiative;
break;
case(PNDCP_OPTION_ALLSELECTOR):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_all, &suboption);
val_str = pn_dcp_suboption_all;
break;
default:
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_manuf, &suboption);
val_str = pn_dcp_suboption_manuf;
}
proto_item_append_text(block_item, ", Status from %s - %s",
val_to_str(option, pn_dcp_option, "Unknown"), val_to_str(suboption, val_str, "Unknown"));
if(append_col) {
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", val_to_str(suboption, val_str, "Unknown"));
}
return offset;
}
/* dissect the "IP" suboption */
static int
dissect_PNDCP_Suboption_IP(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id, gboolean is_response)
{
guint8 suboption;
guint16 block_length;
guint16 block_info;
guint16 block_qualifier;
guint32 ip;
proto_item *item = NULL;
/* SuboptionIPParameter */
offset = dissect_pn_uint8 (tvb, offset, pinfo, tree, hf_pn_dcp_suboption_ip, &suboption);
/* DCPBlockLength */
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
switch(suboption) {
case(PNDCP_SUBOPTION_IP_MAC):
/* MACAddressValue? */
pn_append_info(pinfo, dcp_item, ", MAC");
proto_item_append_text(block_item, "IP/MAC");
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
break;
case(PNDCP_SUBOPTION_IP_IP):
pn_append_info(pinfo, dcp_item, ", IP");
proto_item_append_text(block_item, "IP/IP");
/* BlockInfo? */
if( ((service_id == PNDCP_SERVICE_ID_IDENTIFY) && is_response) ||
((service_id == PNDCP_SERVICE_ID_HELLO) && !is_response) ||
((service_id == PNDCP_SERVICE_ID_GET) && is_response)) {
block_info = tvb_get_ntohs (tvb, offset);
if (tree) {
item = proto_tree_add_uint(tree, hf_pn_dcp_suboption_ip_block_info, tvb, offset, 2, block_info);
}
offset += 2;
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_suboption_ip_block_info, "Undecoded"));
block_length -= 2;
if(block_info & 0x80) {
expert_add_info_format(pinfo, item, PI_RESPONSE_CODE, PI_NOTE, "IP address conflict detected!");
}
}
/* BlockQualifier? */
if( (service_id == PNDCP_SERVICE_ID_SET) && !is_response) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
block_length -= 2;
}
/* IPParameterValue ... */
/* IPAddress */
offset = dissect_pn_ipv4(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_ip_ip, &ip);
proto_item_append_text(block_item, ", IP: %s", ip_to_str((guint8*)&ip));
/* Subnetmask */
offset = dissect_pn_ipv4(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_ip_subnetmask, &ip);
proto_item_append_text(block_item, ", Subnet: %s", ip_to_str((guint8*)&ip));
/* StandardGateway */
offset = dissect_pn_ipv4(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_ip_standard_gateway, &ip);
proto_item_append_text(block_item, ", Gateway: %s", ip_to_str((guint8*)&ip));
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect the "device" suboption */
static int
dissect_PNDCP_Suboption_Device(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id, gboolean is_response)
{
guint8 suboption;
guint16 block_length;
gchar *info_str;
guint8 device_role;
guint16 vendor_id;
guint16 device_id;
char *typeofstation;
char *nameofstation;
char *aliasname;
guint16 block_info;
guint16 block_qualifier;
gboolean have_block_info=FALSE;
gboolean have_block_qualifier=FALSE;
/* SuboptionDevice... */
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_device, &suboption);
/* DCPBlockLength */
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
/* BlockInfo? */
if( ((service_id == PNDCP_SERVICE_ID_IDENTIFY) && is_response) ||
((service_id == PNDCP_SERVICE_ID_HELLO) && !is_response) ||
((service_id == PNDCP_SERVICE_ID_GET) && is_response)) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_info, &block_info);
have_block_info=TRUE;
block_length -= 2;
}
/* BlockQualifier? */
if( (service_id == PNDCP_SERVICE_ID_SET) && !is_response) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
have_block_qualifier=TRUE;
block_length -= 2;
}
switch(suboption) {
case(PNDCP_SUBOPTION_DEVICE_MANUF):
typeofstation = ep_alloc(block_length+1);
tvb_memcpy(tvb, (guint8 *) typeofstation, offset, block_length);
typeofstation[block_length] = '\0';
proto_tree_add_string (tree, hf_pn_dcp_suboption_device_typeofstation, tvb, offset, block_length, typeofstation);
pn_append_info(pinfo, dcp_item, ", TypeOfStation");
proto_item_append_text(block_item, "Device/Manufacturer specific");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_item_append_text(block_item, ", TypeOfStation: \"%s\"", typeofstation);
offset += block_length;
break;
case(PNDCP_SUBOPTION_DEVICE_NAMEOFSTATION):
nameofstation = ep_alloc(block_length+1);
tvb_memcpy(tvb, (guint8 *) nameofstation, offset, block_length);
nameofstation[block_length] = '\0';
proto_tree_add_string (tree, hf_pn_dcp_suboption_device_nameofstation, tvb, offset, block_length, nameofstation);
pn_append_info(pinfo, dcp_item, ep_strdup_printf(", NameOfStation:\"%s\"", nameofstation));
proto_item_append_text(block_item, "Device/NameOfStation");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_item_append_text(block_item, ", \"%s\"", nameofstation);
offset += block_length;
break;
case(PNDCP_SUBOPTION_DEVICE_DEV_ID):
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_vendor_id, &vendor_id);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_device_id, &device_id);
pn_append_info(pinfo, dcp_item, ", Dev-ID");
proto_item_append_text(block_item, "Device/Device ID");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_item_append_text(block_item, ", VendorID: 0x%04x / DeviceID: 0x%04x", vendor_id, device_id);
break;
case(PNDCP_SUBOPTION_DEVICE_DEV_ROLE):
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_device_role, &device_role);
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_reserved8, NULL);
pn_append_info(pinfo, dcp_item, ", Dev-Role");
proto_item_append_text(block_item, "Device/Device Role");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
if(device_role & 0x01)
proto_item_append_text(block_item, ", IO-Device");
if(device_role & 0x02)
proto_item_append_text(block_item, ", IO-Controller");
if(device_role & 0x04)
proto_item_append_text(block_item, ", IO-Multidevice");
if(device_role & 0x08)
proto_item_append_text(block_item, ", PN-Supervisor");
break;
case(PNDCP_SUBOPTION_DEVICE_DEV_OPTIONS):
info_str = ep_strdup_printf(", Dev-Options(%u)", block_length/2);
pn_append_info(pinfo, dcp_item, info_str);
proto_item_append_text(block_item, "Device/Device Options");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_item_append_text(block_item, ", %u options", block_length/2);
for( ; block_length != 0; block_length -= 2) {
offset = dissect_PNDCP_Option(tvb, offset, pinfo, tree, NULL /*block_item*/, hf_pn_dcp_option,
FALSE /* append_col */);
}
break;
case(PNDCP_SUBOPTION_DEVICE_ALIAS_NAME):
aliasname = ep_alloc(block_length+1);
tvb_memcpy(tvb, (guint8 *) aliasname, offset, block_length);
aliasname[block_length] = '\0';
proto_tree_add_string (tree, hf_pn_dcp_suboption_device_aliasname, tvb, offset, block_length, aliasname);
pn_append_info(pinfo, dcp_item, ep_strdup_printf(", AliasName:\"%s\"", aliasname));
proto_item_append_text(block_item, "Device/AliasName");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_item_append_text(block_item, ", \"%s\"", aliasname);
offset += block_length;
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect the "DHCP" suboption */
static int
dissect_PNDCP_Suboption_DHCP(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id _U_, gboolean is_response _U_)
{
guint8 suboption;
guint16 block_length;
guint16 block_info;
guint16 block_qualifier;
gboolean have_block_info=FALSE;
gboolean have_block_qualifier=FALSE;
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_dhcp, &suboption);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
/* BlockInfo? */
if( ((service_id == PNDCP_SERVICE_ID_IDENTIFY) && is_response) ||
((service_id == PNDCP_SERVICE_ID_HELLO) && !is_response) ||
((service_id == PNDCP_SERVICE_ID_GET) && is_response)) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_info, &block_info);
have_block_info=TRUE;
block_length -= 2;
}
/* BlockQualifier? */
if( (service_id == PNDCP_SERVICE_ID_SET) && !is_response) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
have_block_qualifier=TRUE;
block_length -= 2;
}
switch(suboption) {
case(PNDCP_SUBOPTION_DHCP_CLIENT_ID):
pn_append_info(pinfo, dcp_item, ", DHCP client identifier");
proto_item_append_text(block_item, "DHCP/Client-ID");
if(have_block_qualifier)
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
if(have_block_info)
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
proto_tree_add_item(tree, hf_pn_dcp_suboption_dhcp_device_id, tvb, offset, block_length, FALSE);
offset += block_length;
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect the "control" suboption */
static int
dissect_PNDCP_Suboption_Control(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id _U_, gboolean is_response _U_)
{
guint8 suboption;
guint16 block_length;
guint16 block_qualifier;
gchar *info_str;
guint8 block_error;
proto_item *item = NULL;
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_control, &suboption);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
switch(suboption) {
case(PNDCP_SUBOPTION_CONTROL_START_TRANS):
pn_append_info(pinfo, dcp_item, ", Start-Trans");
proto_item_append_text(block_item, "Control/Start-Transaction");
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
break;
case(PNDCP_SUBOPTION_CONTROL_END_TRANS):
pn_append_info(pinfo, dcp_item, ", End-Trans");
proto_item_append_text(block_item, "Control/End-Transaction");
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
break;
case(PNDCP_SUBOPTION_CONTROL_SIGNAL):
pn_append_info(pinfo, dcp_item, ", Signal");
proto_item_append_text(block_item, "Control/Signal");
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
block_length -= 2;
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
break;
case(PNDCP_SUBOPTION_CONTROL_RESPONSE):
proto_item_append_text(block_item, "Control/Response");
offset = dissect_PNDCP_Option(tvb, offset, pinfo, tree, block_item, hf_pn_dcp_suboption_control_response,
FALSE /* append_col */);
block_error = tvb_get_guint8 (tvb, offset);
if (tree) {
item = proto_tree_add_uint(tree, hf_pn_dcp_block_error, tvb, offset, 1, block_error);
}
offset += 1;
if(block_error != 0) {
expert_add_info_format(pinfo, item, PI_RESPONSE_CODE, PI_CHAT,
"%s", val_to_str(block_error, pn_dcp_block_error, "Unknown"));
}
info_str = ep_strdup_printf(", Response(%s)", val_to_str(block_error, pn_dcp_block_error, "Unknown"));
pn_append_info(pinfo, dcp_item, info_str);
proto_item_append_text(block_item, ", BlockError: %s", val_to_str(block_error, pn_dcp_block_error, "Unknown"));
break;
case(PNDCP_SUBOPTION_CONTROL_FACT_RESET):
pn_append_info(pinfo, dcp_item, ", Reset FactorySettings");
proto_item_append_text(block_item, "Control/Reset FactorySettings");
offset += 2;
block_length -= 2;
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect the "deviceinitaitve" suboption */
static int
dissect_PNDCP_Suboption_DeviceInitiative(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id, gboolean is_response)
{
guint8 suboption;
guint16 block_length;
guint16 block_info;
guint16 block_qualifier;
guint16 value;
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_deviceinitiative, &suboption);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
pn_append_info(pinfo, dcp_item, ", DeviceInitiative");
proto_item_append_text(block_item, "DeviceInitiative/DeviceInitiative");
/* BlockInfo? */
if( ((service_id == PNDCP_SERVICE_ID_IDENTIFY) && is_response) ||
((service_id == PNDCP_SERVICE_ID_HELLO) && !is_response) ||
((service_id == PNDCP_SERVICE_ID_GET) && is_response)) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_info, &block_info);
proto_item_append_text(block_item, ", BlockInfo: %s", val_to_str(block_info, pn_dcp_block_info, "Unknown"));
block_length -= 2;
}
/* BlockQualifier? */
if( (service_id == PNDCP_SERVICE_ID_SET) && !is_response) {
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_qualifier, &block_qualifier);
proto_item_append_text(block_item, ", BlockQualifier: %s", val_to_str(block_qualifier, pn_dcp_block_qualifier, "Unknown"));
block_length -= 2;
}
/* DeviceInitiativeValue */
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_deviceinitiative_value, &value);
return offset;
}
/* dissect the "all" suboption */
static int
dissect_PNDCP_Suboption_All(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id _U_, gboolean is_response _U_)
{
guint8 suboption;
guint16 block_length;
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_all, &suboption);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
switch(suboption) {
case(255): /* All */
pn_append_info(pinfo, dcp_item, ", All");
proto_item_append_text(block_item, "All/All");
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect the "manufacturer" suboption */
static int
dissect_PNDCP_Suboption_Manuf(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *block_item, proto_item *dcp_item,
guint8 service_id _U_, gboolean is_response _U_)
{
guint8 suboption;
guint16 block_length;
offset = dissect_pn_uint8(tvb, offset, pinfo, tree, hf_pn_dcp_suboption_manuf, &suboption);
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_block_length, &block_length);
switch(suboption) {
default:
pn_append_info(pinfo, dcp_item, ", Manufacturer Specific");
proto_item_append_text(block_item, "Manufacturer Specific");
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, block_length);
}
return offset;
}
/* dissect one DCP block */
static int
dissect_PNDCP_Block(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *dcp_item,
guint8 service_id, gboolean is_response)
{
guint8 option;
proto_item *block_item;
proto_tree *block_tree;
int ori_offset = offset;
/* subtree for block */
block_item = proto_tree_add_none_format(tree, hf_pn_dcp_block,
tvb, offset, 0, "Block: ");
block_tree = proto_item_add_subtree(block_item, ett_pn_dcp_block);
offset = dissect_pn_uint8(tvb, offset, pinfo, block_tree, hf_pn_dcp_option, &option);
switch(option) {
case(PNDCP_OPTION_IP):
offset = dissect_PNDCP_Suboption_IP(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_DEVICE):
offset = dissect_PNDCP_Suboption_Device(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_DHCP):
offset = dissect_PNDCP_Suboption_DHCP(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_CONTROL):
offset = dissect_PNDCP_Suboption_Control(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_DEVICEINITIATIVE):
offset = dissect_PNDCP_Suboption_DeviceInitiative(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_ALLSELECTOR):
offset = dissect_PNDCP_Suboption_All(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
break;
case(PNDCP_OPTION_MANUF_X80):
case(PNDCP_OPTION_MANUF_X81):
default:
offset = dissect_PNDCP_Suboption_Manuf(tvb, offset, pinfo, block_tree, block_item, dcp_item, service_id, is_response);
}
proto_item_set_len(block_item, offset-ori_offset);
if((offset-ori_offset) & 1) {
/* we have an odd number of bytes in this block, add a padding byte */
offset = dissect_pn_padding(tvb, offset, pinfo, tree, 1);
}
return offset;
}
/* dissect a whole DCP PDU */
static void
dissect_PNDCP_PDU(tvbuff_t *tvb,
packet_info *pinfo, proto_tree *tree, proto_item *dcp_item)
{
guint8 service_id;
guint8 service_type;
guint32 xid;
guint16 response_delay;
guint16 data_length;
int offset = 0;
gchar *xid_str;
gboolean is_response = FALSE;
offset = dissect_pn_uint8 (tvb, offset, pinfo, tree, hf_pn_dcp_service_id, &service_id);
offset = dissect_pn_uint8 (tvb, offset, pinfo, tree, hf_pn_dcp_service_type, &service_type);
offset = dissect_pn_uint32(tvb, offset, pinfo, tree, hf_pn_dcp_xid, &xid);
if(service_id == PNDCP_SERVICE_ID_IDENTIFY && service_type == PNDCP_SERVICE_TYPE_REQUEST) {
/* multicast header */
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_response_delay, &response_delay);
} else {
/* unicast header */
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_reserved16, NULL);
}
offset = dissect_pn_uint16(tvb, offset, pinfo, tree, hf_pn_dcp_data_length, &data_length);
switch(service_id) {
case(PNDCP_SERVICE_ID_GET):
pn_append_info(pinfo, dcp_item, "Get");
break;
case(PNDCP_SERVICE_ID_SET):
pn_append_info(pinfo, dcp_item, "Set");
break;
case(PNDCP_SERVICE_ID_IDENTIFY):
pn_append_info(pinfo, dcp_item, "Ident");
break;
case(PNDCP_SERVICE_ID_HELLO):
pn_append_info(pinfo, dcp_item, "Hello");
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, tvb_length_remaining(tvb, offset));
return;
}
switch(service_type) {
case(PNDCP_SERVICE_TYPE_REQUEST):
pn_append_info(pinfo, dcp_item, " Req");
break;
case(PNDCP_SERVICE_TYPE_RESPONSE_SUCCESS):
pn_append_info(pinfo, dcp_item, " Ok ");
is_response = TRUE;
break;
case(PNDCP_SERVICE_TYPE_RESPONSE_UNSUPPORTED):
pn_append_info(pinfo, dcp_item, " unsupported");
is_response = TRUE;
break;
default:
offset = dissect_pn_undecoded(tvb, offset, pinfo, tree, tvb_length_remaining(tvb, offset));
return;
}
xid_str = ep_strdup_printf(", Xid:0x%x", xid);
pn_append_info(pinfo, dcp_item, xid_str);
/* dissect a number of blocks (depending on the remaining length) */
while(data_length) {
int ori_offset = offset;
if(service_id == PNDCP_SERVICE_ID_GET && service_type == PNDCP_SERVICE_TYPE_REQUEST) {
/* Selectors */
offset = dissect_PNDCP_Option(tvb, offset, pinfo,
tree, dcp_item, hf_pn_dcp_option, TRUE /* append_col */);
} else {
offset = dissect_PNDCP_Block(tvb, offset, pinfo, tree, dcp_item, service_id, is_response);
}
/* prevent an infinite loop */
if(offset <= ori_offset || data_length < (offset - ori_offset)) {
THROW(ReportedBoundsError);
}
data_length -= (offset - ori_offset);
}
}
/* possibly dissect a PN-RT packet (frame ID must be in the appropriate range) */
static gboolean
dissect_PNDCP_Data_heur(tvbuff_t *tvb,
packet_info *pinfo, proto_tree *tree)
{
guint16 u16FrameID;
proto_item *item = NULL;
proto_tree *dcp_tree = NULL;
/* the tvb will NOT contain the frame_id here, so get it from our private data! */
u16FrameID = GPOINTER_TO_UINT(pinfo->private_data);
/* frame id must be in valid range (acyclic Real-Time, DCP) */
if (u16FrameID < FRAME_ID_DCP_HELLO || u16FrameID > FRAME_ID_DCP_IDENT_RES) {
/* we are not interested in this packet */
return FALSE;
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PN-DCP");
col_clear(pinfo->cinfo, COL_INFO);
/* subtree for DCP */
item = proto_tree_add_protocol_format(tree, proto_pn_dcp, tvb, 0, tvb_get_ntohs(tvb, 8) + 10,
"PROFINET DCP, ");
dcp_tree = proto_item_add_subtree(item, ett_pn_dcp);
/* dissect this PDU */
dissect_PNDCP_PDU(tvb, pinfo, dcp_tree, item);
return TRUE;
}
void
proto_register_pn_dcp (void)
{
static hf_register_info hf[] = {
{ &hf_pn_dcp_service_id,
{ "ServiceID", "pn_dcp.service_id", FT_UINT8, BASE_DEC, VALS(pn_dcp_service_id), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_service_type,
{ "ServiceType", "pn_dcp.service_type", FT_UINT8, BASE_DEC, VALS(pn_dcp_service_type), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_xid,
{ "Xid", "pn_dcp.xid", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_reserved8,
{ "Reserved", "pn_dcp.reserved8", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_reserved16,
{ "Reserved", "pn_dcp.reserved16", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_response_delay,
{ "ResponseDelay", "pn_dcp.response_delay", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_data_length,
{ "DCPDataLength", "pn_dcp.data_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_block_length,
{ "DCPBlockLength", "pn_dcp.block_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_option,
{ "Option", "pn_dcp.option", FT_UINT8, BASE_DEC, VALS(pn_dcp_option), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption,
{ "Suboption", "pn_dcp.suboption", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_block_error,
{ "BlockError", "pn_dcp.block_error", FT_UINT8, BASE_DEC, VALS(pn_dcp_block_error), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_block,
{ "Block", "pn_dcp.block", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_block_info,
{ "BlockInfo", "pn_dcp.block_info", FT_UINT16, BASE_DEC, VALS(pn_dcp_block_info), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_block_qualifier,
{ "BlockQualifier", "pn_dcp.block_qualifier", FT_UINT16, BASE_DEC, VALS(pn_dcp_block_qualifier), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_ip,
{ "Suboption", "pn_dcp.suboption_ip", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_ip), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_ip_block_info,
{ "BlockInfo", "pn_dcp.suboption_ip_block_info", FT_UINT16, BASE_DEC, VALS(pn_dcp_suboption_ip_block_info), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_ip_ip,
{ "IPaddress", "pn_dcp.subobtion_ip_ip", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_ip_subnetmask,
{ "Subnetmask", "pn_dcp.subobtion_ip_subnetmask", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_ip_standard_gateway,
{ "StandardGateway", "pn_dcp.suboption_ip_standard_gateway", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device,
{ "Suboption", "pn_dcp.suboption_device", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_device), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device_typeofstation,
{ "TypeOfStation", "pn_dcp.suboption_device_typeofstation", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device_nameofstation,
{ "NameOfStation", "pn_dcp.suboption_device_nameofstation", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_vendor_id,
{ "VendorID", "pn_dcp.suboption_vendor_id", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device_id,
{ "DeviceID", "pn_dcp.suboption_device_id", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device_role,
{ "DeviceRoleDetails", "pn_dcp.suboption_device_role", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_device_aliasname,
{ "AliasName", "pn_dcp.suboption_device_aliasname", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_dhcp,
{ "Suboption", "pn_dcp.suboption_dhcp", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_dhcp), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_dhcp_device_id,
{ "Device ID", "pn_dcp.suboption_dhcp_device_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_control,
{ "Suboption", "pn_dcp.suboption_control", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_control), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_control_response,
{ "Response", "pn_dcp.suboption_control_response", FT_UINT8, BASE_DEC, VALS(pn_dcp_option), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_deviceinitiative,
{ "Suboption", "pn_dcp.suboption_deviceinitiative", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_deviceinitiative), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_deviceinitiative_value,
{ "DeviceInitiativeValue", "pn_dcp.deviceinitiative_value", FT_UINT16, BASE_DEC, VALS(pn_dcp_deviceinitiative_value), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_all,
{ "Suboption", "pn_dcp.suboption_all", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_all), 0x0, NULL, HFILL }},
{ &hf_pn_dcp_suboption_manuf,
{ "Suboption", "pn_dcp.suboption_manuf", FT_UINT8, BASE_DEC, VALS(pn_dcp_suboption_manuf), 0x0, NULL, HFILL }},
};
static gint *ett[] = {
&ett_pn_dcp,
&ett_pn_dcp_block
};
proto_pn_dcp = proto_register_protocol ("PROFINET DCP", "PN-DCP", "pn_dcp");
proto_register_field_array (proto_pn_dcp, hf, array_length (hf));
proto_register_subtree_array (ett, array_length (ett));
}
void
proto_reg_handoff_pn_dcp (void)
{
/* register ourself as an heuristic pn-rt payload dissector */
heur_dissector_add("pn_rt", dissect_PNDCP_Data_heur, proto_pn_dcp);
}
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