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wireshark/epan/dissectors/packet-opsi.c

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/* packet-opsi.c
* Routines for OPSI protocol dissection
* Copyright 2004, Laurent Rabret (France Telecom R&D) <laurent.rabret@i.hate.spams.org>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/expert.h>
#include "packet-tcp.h"
void proto_register_opsi(void);
void proto_reg_handoff_opsi(void);
/* TCP destination port dedicated to the OPSI protocol */
#define TCP_PORT_OPSI 4002 /* Not IANA registered */
/* Information position in OPSI header */
#define MAJOR_VERSION_OFFSET 0
#define MINOR_VERSION_OFFSET 1
#define CODE_OFFSET 2
#define HOOK_ID_OFFSET 3
#define PACKET_LENGTH_OFFSET 4
#define SESSION_OFFSET 6
#define HEADER_LENGTH 8
/* Valid OPSI code values */
#define DISCOVER_REQUEST 1
#define DISCOVER_RESPONSE 2
#define SERVICE_REQUEST 3
#define SERVICE_ACCEPT 4
#define SERVICE_REJECT 5
#define TERMINATE_REQUEST 6
/* Internal structure to dissect attributes */
typedef struct {
guint16 attribute_type; /* attribute code */
const char *tree_text; /* text for fold out */
gint *tree_id; /* id for add_item */
int *hf_type_attribute; /* id for seach option */
void (*dissect)(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item,
int* hfValue, int offset, int length);
} opsi_attribute_handle_t;
/* Attributes codes */
#define USER_NAME_ATTRIBUTE 1
#define USER_PASSWD_ATTRIBUTE 2
#define CHAP_PASSWD_ATTRIBUTE 3
#define NAS_IP_ADDRESS_ATTRIBUTE 4
#define NAS_PORT_ATTRIBUTE 5
#define SERVICE_TYPE_ATTRIBUTE 6
#define FRAMED_PROTOCOL_ATTRIBUTE 7
#define FRAMED_ADDRESS_ATTRIBUTE 8
#define FRAMED_NETMASK_ATTRIBUTE 9
#define FRAMED_ROUTING_ATTRIBUTE 10
#define FRAMED_FILTER_ATTRIBUTE 11
#define FRAMED_MTU_ATTRIBUTE 12
#define FRAMED_COMPRESSION_ATTRIBUTE 13
#define CALLED_STATION_ID_ATTRIBUTE 30
#define CALLING_STATION_ID_ATTRIBUTE 31
#define NAS_IDENTIFIER 32
#define ACCOUNTING_40_ATTRIBUTE 40
#define ACCOUNTING_41_ATTRIBUTE 41
#define ACCOUNTING_42_ATTRIBUTE 42
#define ACCOUNTING_43_ATTRIBUTE 43
#define ACCOUNTING_SESSION_ID_ATTRIBUTE 44
#define ACCOUNTING_45_ATTRIBUTE 45
#define ACCOUNTING_46_ATTRIBUTE 46
#define ACCOUNTING_47_ATTRIBUTE 47
#define ACCOUNTING_48_ATTRIBUTE 48
#define ACCOUNTING_49_ATTRIBUTE 49
#define ACCOUNTING_50_ATTRIBUTE 50
#define ACCOUNTING_51_ATTRIBUTE 51
#define ACCOUNTING_52_ATTRIBUTE 52
#define ACCOUNTING_53_ATTRIBUTE 53
#define ACCOUNTING_54_ATTRIBUTE 54
#define ACCOUNTING_55_ATTRIBUTE 55
#define ACCOUNTING_56_ATTRIBUTE 56
#define ACCOUNTING_57_ATTRIBUTE 57
#define ACCOUNTING_58_ATTRIBUTE 58
#define ACCOUNTING_59_ATTRIBUTE 59
#define CHAP_CHALLENGE_ATTRIBUTE 60
#define NAS_PORT_TYPE_ATTRIBUTE 61
#define DESIGNATION_NUMBER_ATTRIBUTE 77
#define NAS_PORT_ID_ATTRIBUTE 87
#define SMC_AAAID_ATTRIBUTE 651
#define SMC_VPNID_ATTRIBUTE 652
#define SMC_VPNNAME_ATTRIBUTE 653
#define SMC_RANID_ATTRIBUTE 654
#define SMC_RANIP_ATTRIBUTE 655
#define SMC_RANNAME_ATTRIBUTE 656
#define SMC_POPID_ATTRIBUTE 657
#define SMC_POPNAME_ATTRIBUTE 658
#define SMC_SMCID_ATTRIBUTE 659
#define SMC_RECEIVE_TIME_ATTRIBUTE 660
#define SMC_STAT_TIME_ATTRIBUTE 661
#define OPSI_FLAGS_ATTRIBUTE 674
#define OPSI_APPLICATION_NAME_ATTRIBUTE 675
/*
* Published API functions. NOTE, "local" API functions
* only valid from the packet-opsi file.
*/
static void decode_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length);
static void decode_ipv4_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length);
static void decode_longint_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length);
static void decode_value_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length);
static void decode_time_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length);
/******* *******/
/* Initialize the protocol and registered fields */
static int proto_opsi = -1;
static int hf_opsi_major_version = -1;
static int hf_opsi_minor_version = -1;
static int hf_opsi_opcode = -1;
static int hf_opsi_hook_id = -1;
static int hf_opsi_length = -1;
static int hf_opsi_session_id = -1;
static int hf_user_name_att = -1;
static int hf_password_att = -1;
static int hf_chap_password_att = -1;
static int hf_nas_ip_add_att = -1;
static int hf_nas_port_att = -1;
static int hf_service_type_att = -1;
static int hf_framed_protocol_att = -1;
static int hf_framed_address_att = -1;
static int hf_framed_netmask_att = -1;
static int hf_framed_routing_att = -1;
static int hf_framed_filter_att = -1;
static int hf_framed_mtu_att = -1;
static int hf_framed_compression_att = -1;
static int hf_called_station_att = -1;
static int hf_calling_station_att = -1;
static int hf_nas_identifier_att = -1;
static int hf_accounting_att = -1;
static int hf_acct_session_id_att = -1;
static int hf_chap_challenge_att = -1;
static int hf_nas_port_type_att = -1;
static int hf_designation_num_att = -1;
static int hf_nas_port_id_att = -1;
static int hf_smc_aaa_id_att = -1;
static int hf_smc_vpn_id_att = -1;
static int hf_smc_vpn_name_att = -1;
static int hf_smc_ran_id_att = -1;
static int hf_smc_ran_ip_att = -1;
static int hf_smc_ran_name_att = -1;
static int hf_smc_pop_id_att = -1;
static int hf_smc_pop_name_att = -1;
static int hf_smc_id_att = -1;
static int hf_smc_receive_time_att = -1;
static int hf_smc_stat_time_att = -1;
static int hf_opsi_flags_att = -1;
static int hf_opsi_application_name_att = -1;
static int hf_opsi_attribute_length = -1;
/* Initialize the subtree pointers */
static gint ett_opsi = -1;
static gint ett_opsi_user_name = -1;
static gint ett_opsi_user_password = -1;
static gint ett_opsi_chap_password = -1;
static gint ett_opsi_nas_ip_address = -1;
static gint ett_opsi_nas_port = -1;
static gint ett_opsi_service_type = -1;
static gint ett_opsi_framed_protocol = -1;
static gint ett_opsi_framed_address = -1;
static gint ett_opsi_framed_netmask = -1;
static gint ett_opsi_framed_routing = -1;
static gint ett_opsi_framed_filter = -1;
static gint ett_opsi_framed_mtu = -1;
static gint ett_opsi_framed_compression = -1;
static gint ett_opsi_called_station_id = -1;
static gint ett_opsi_calling_station_id = -1;
static gint ett_opsi_nas_identifier = -1;
static gint ett_opsi_accounting = -1;
static gint ett_opsi_acct_session_id = -1;
static gint ett_opsi_chap_challenge = -1;
static gint ett_opsi_nas_port_type = -1;
static gint ett_opsi_designation_number = -1;
static gint ett_opsi_nas_port_id = -1;
static gint ett_opsi_smc_aaa_id = -1;
static gint ett_opsi_smc_vpn_id = -1;
static gint ett_opsi_smc_vpn_name = -1;
static gint ett_opsi_smc_ran_id = -1;
static gint ett_opsi_smc_ran_ip = -1;
static gint ett_opsi_smc_ran_name = -1;
static gint ett_opsi_smc_pop_id = -1;
static gint ett_opsi_smc_pop_name = -1;
static gint ett_opsi_smc_id = -1;
static gint ett_opsi_smc_receive_time = -1;
static gint ett_opsi_smc_stat_time = -1;
static gint ett_opsi_flags = -1;
static gint ett_opsi_application_name = -1;
static expert_field ei_opsi_unknown_attribute = EI_INIT;
static expert_field ei_opsi_short_attribute = EI_INIT;
static expert_field ei_opsi_short_frame = EI_INIT;
/* Code mapping */
static const value_string opsi_opcode[] = {
{ DISCOVER_REQUEST, "Discover Request" },
{ DISCOVER_RESPONSE, "Discover Response" },
{ SERVICE_REQUEST, "Service Request" },
{ SERVICE_ACCEPT, "Service Accept" },
{ SERVICE_REJECT, "Service Reject" },
{ TERMINATE_REQUEST, "Terminate Request" },
{ 0, NULL }
};
static const value_string opsi_service_type_code[] = {
{ 1, "Login" },
{ 2, "Framed" },
{ 3, "Callback Login" },
{ 4, "Callback Framed" },
{ 5, "Outbound" },
{ 6, "Administrative" },
{ 7, "NAS Prompt" },
{ 8, "Authenticate Only" },
{ 9, "Callback NAS Prompt" },
{ 0, NULL }
};
static const value_string opsi_framed_protocol_code[] = {
{ 1, "PPP" },
{ 2, "SLIP" },
{ 3, "AppleTalk Remote Access Protocol (ARAP)" },
{ 4, "Gandalf proprietary SingleLink/MultiLink protocol" },
{ 5, "Xylogics proprietary IPX/SLIP" },
{ 255, "Ascend ARA" },
{ 256, "MPP" },
{ 257, "EURAW" },
{ 258, "EUUI" },
{ 259, "X25" },
{ 260, "COMB" },
{ 261, "FR" },
{ 262, "MP" },
{ 263, "FR-CIR"},
{ 0, NULL }
};
static const value_string opsi_framed_routing_code[] = {
{ 0, "None" },
{ 1, "Broadcast" },
{ 2, "Listen" },
{ 3, "Broadcast-Listen" },
{ 4, "Broadcast V2" },
{ 5, "Listen V2" },
{ 6, "Broadcast-Listen V2" },
{ 0, NULL },
};
static const value_string opsi_framed_compression_code[] = {
{ 0, "None" },
{ 1, "Van Jacobsen TCP/IP" },
{ 2, "IPX header compression" },
{ 0, NULL }
};
static const value_string opsi_nas_port_type_code[] = {
{ 0, "Async" },
{ 1, "Sync" },
{ 2, "ISDN Sync" },
{ 3, "ISDN Async V.120" },
{ 4, "ISDN Async V.110" },
{ 5, "Virtual" },
{ 6, "PIAFS" },
{ 7, "HDLC Clear Channel" },
{ 8, "X.25" },
{ 9, "X.75" },
{ 10, "G.3 Fax" },
{ 11, "SDSL - Symmetric DSL" },
{ 12, "ADSL-CAP - Asymmetric DSL, Carrierless Amplitude Phase Modulation" },
{ 13, "ADSL-DMT - Asymmetric DSL, Discrete Multi-Tone" },
{ 14, "IDSL - ISDN Digital Subscriber Line" },
{ 15, "Ethernet" },
{ 16, "xDSL - Digital Subscriber Line of unknown type" },
{ 17, "Cable" },
{ 18, "Wireless - Other" },
{ 19, "Wireless - IEEE 802.11" },
{ 201, "Voice over IP" },
{ 0, NULL }
};
/* Structure used to decode OPSI frame attributes */
/* CAUTION : it is compulsory to sort this array */
/* (first argument of the opsi_attribute_handle_t) */
/* in ascending order */
/* */
static opsi_attribute_handle_t opsi_attributes[] = {
{ USER_NAME_ATTRIBUTE, /* 1 */
"User name attribute", &ett_opsi_user_name, &hf_user_name_att, decode_string_attribute },
{ USER_PASSWD_ATTRIBUTE, /* 2 */
"User password attribute" , &ett_opsi_user_password, &hf_password_att, decode_string_attribute },
{ CHAP_PASSWD_ATTRIBUTE, /* 3 */
"CHAP password attribute", &ett_opsi_chap_password, &hf_chap_password_att, decode_string_attribute },
{ NAS_IP_ADDRESS_ATTRIBUTE, /* 4 */
"NAS IP address attribute", &ett_opsi_nas_ip_address, &hf_nas_ip_add_att, decode_ipv4_attribute },
{NAS_PORT_ATTRIBUTE, /* 5 */
"NAS port attribute", &ett_opsi_nas_port, &hf_nas_port_att, decode_longint_attribute },
{SERVICE_TYPE_ATTRIBUTE, /* 6 */
"Service type attribute", &ett_opsi_service_type, &hf_service_type_att, decode_value_string_attribute },
{FRAMED_PROTOCOL_ATTRIBUTE, /* 7 */
"Framed protocol attribute", &ett_opsi_framed_protocol, &hf_framed_protocol_att, decode_value_string_attribute },
{FRAMED_ADDRESS_ATTRIBUTE, /* 8 */
"Framed address attribute", &ett_opsi_framed_address, &hf_framed_address_att, decode_ipv4_attribute },
{FRAMED_NETMASK_ATTRIBUTE, /* 9 */
"Framed netmask attribute", &ett_opsi_framed_netmask, &hf_framed_netmask_att, decode_ipv4_attribute },
{FRAMED_ROUTING_ATTRIBUTE, /* 10 */
"Framed routing attribute", &ett_opsi_framed_routing, &hf_framed_routing_att, decode_value_string_attribute },
{FRAMED_FILTER_ATTRIBUTE, /* 11 */
"Framed filter attribute", &ett_opsi_framed_filter, &hf_framed_filter_att, decode_string_attribute },
{FRAMED_MTU_ATTRIBUTE, /* 12 */
"Framed MTU attribute", &ett_opsi_framed_mtu, &hf_framed_mtu_att, decode_longint_attribute },
{FRAMED_COMPRESSION_ATTRIBUTE, /* 13 */
"Framed compression attribute", &ett_opsi_framed_compression, &hf_framed_compression_att, decode_value_string_attribute },
{CALLED_STATION_ID_ATTRIBUTE, /* 30 */
"Called station ID attribute", &ett_opsi_called_station_id, &hf_called_station_att, decode_string_attribute },
{CALLING_STATION_ID_ATTRIBUTE, /* 31 */
"Calling station ID attribute", &ett_opsi_calling_station_id, &hf_calling_station_att, decode_string_attribute },
{NAS_IDENTIFIER, /* 32 */
"NAS Identifier attribute", &ett_opsi_nas_identifier, &hf_nas_identifier_att, decode_string_attribute },
{ACCOUNTING_40_ATTRIBUTE, /* 40 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_41_ATTRIBUTE, /* 41 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_42_ATTRIBUTE, /* 42 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_43_ATTRIBUTE, /* 43 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_SESSION_ID_ATTRIBUTE, /* 44 */
"Accounting session ID attribute", &ett_opsi_acct_session_id, &hf_acct_session_id_att, decode_string_attribute },
{ACCOUNTING_45_ATTRIBUTE, /* 45 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_46_ATTRIBUTE, /* 46 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_47_ATTRIBUTE, /* 47 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_48_ATTRIBUTE, /* 48 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_49_ATTRIBUTE, /* 49 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_50_ATTRIBUTE, /* 50 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_51_ATTRIBUTE, /* 51 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_52_ATTRIBUTE, /* 52 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_53_ATTRIBUTE, /* 53 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_54_ATTRIBUTE, /* 54 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_55_ATTRIBUTE, /* 55 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_56_ATTRIBUTE, /* 56 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_57_ATTRIBUTE, /* 57 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_58_ATTRIBUTE, /* 58 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{ACCOUNTING_59_ATTRIBUTE, /* 59 */
"Accounting attribute", &ett_opsi_accounting, &hf_accounting_att, decode_string_attribute },
{CHAP_CHALLENGE_ATTRIBUTE, /* 60 */
"CHAP challenge", &ett_opsi_chap_challenge, &hf_chap_challenge_att, decode_string_attribute },
{NAS_PORT_TYPE_ATTRIBUTE, /* 61 */
"NAS port type attribute", &ett_opsi_nas_port_type, &hf_nas_port_type_att, decode_value_string_attribute },
{DESIGNATION_NUMBER_ATTRIBUTE, /* 77 */
"Designation number attribute", &ett_opsi_designation_number, &hf_designation_num_att, decode_string_attribute },
{NAS_PORT_ID_ATTRIBUTE, /* 87 */
"NAS port ID attribute", &ett_opsi_nas_port_id, &hf_nas_port_id_att, decode_string_attribute },
{SMC_AAAID_ATTRIBUTE, /* 651 */
"SMC AAA ID attribute", &ett_opsi_smc_aaa_id, &hf_smc_aaa_id_att, decode_longint_attribute },
{SMC_VPNID_ATTRIBUTE, /* 652 */
"SMC VPN ID attribute", &ett_opsi_smc_vpn_id, &hf_smc_vpn_id_att, decode_longint_attribute },
{SMC_VPNNAME_ATTRIBUTE, /* 653 */
"SMC VPN name attribute", &ett_opsi_smc_vpn_name, &hf_smc_vpn_name_att, decode_string_attribute },
{SMC_RANID_ATTRIBUTE, /* 654 */
"SMC RAN ID attribute", &ett_opsi_smc_ran_id, &hf_smc_ran_id_att, decode_longint_attribute },
{SMC_RANIP_ATTRIBUTE, /* 655 */
"SMC RAN IP attribute", &ett_opsi_smc_ran_ip, &hf_smc_ran_ip_att, decode_ipv4_attribute },
{SMC_RANNAME_ATTRIBUTE, /* 656 */
"SMC RAN name attribute", &ett_opsi_smc_ran_name, &hf_smc_ran_name_att, decode_string_attribute },
{SMC_POPID_ATTRIBUTE, /* 657 */
"SMC POP ID attribute", &ett_opsi_smc_pop_id, &hf_smc_pop_id_att, decode_longint_attribute },
{SMC_POPNAME_ATTRIBUTE, /* 658 */
"SMC POP name attribute", &ett_opsi_smc_pop_name, &hf_smc_pop_name_att, decode_string_attribute },
{SMC_SMCID_ATTRIBUTE, /* 659 */
"SMC ID attribute", &ett_opsi_smc_id, &hf_smc_id_att, decode_longint_attribute },
{SMC_RECEIVE_TIME_ATTRIBUTE, /* 660 */
"SMC receive time attribute", &ett_opsi_smc_receive_time, &hf_smc_receive_time_att, decode_time_attribute },
{SMC_STAT_TIME_ATTRIBUTE, /* 661 */
"SMC stat time attribute", &ett_opsi_smc_stat_time, &hf_smc_stat_time_att, decode_longint_attribute },
{OPSI_FLAGS_ATTRIBUTE, /* 674 */
"OPSI flags attribute", &ett_opsi_flags, &hf_opsi_flags_att, decode_longint_attribute },
{OPSI_APPLICATION_NAME_ATTRIBUTE, /* 675 */
"OPSI application name attribute", &ett_opsi_application_name, &hf_opsi_application_name_att, decode_string_attribute },
};
#define OPSI_ATTRIBUTES_COUNT (sizeof(opsi_attributes)/sizeof(opsi_attribute_handle_t))
/* Desegmentation of OPSI (over TCP) */
static gboolean opsi_desegment = TRUE;
static void
decode_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length)
{
if (length < 4) {
expert_add_info(pinfo, item, &ei_opsi_short_attribute);
return;
}
proto_tree_add_item(tree, *hfValue, tvb, offset+4, length-4, ENC_ASCII|ENC_NA);
}
static void
decode_ipv4_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length)
{
if (length < 8) {
expert_add_info(pinfo, item, &ei_opsi_short_attribute);
return;
}
proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN);
}
static void
decode_longint_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length)
{
if (length < 8) {
expert_add_info(pinfo, item, &ei_opsi_short_attribute);
return;
}
proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN);
}
static void
decode_value_string_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length)
{
if (length < 8) {
expert_add_info(pinfo, item, &ei_opsi_short_attribute);
return;
}
proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_BIG_ENDIAN);
}
static void
decode_time_attribute(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, proto_item *item, int* hfValue, int offset, int length)
{
if (length < 8) {
expert_add_info(pinfo, item, &ei_opsi_short_attribute);
return;
}
proto_tree_add_item(tree, *hfValue, tvb, offset+4, 4, ENC_TIME_SECS|ENC_BIG_ENDIAN);
}
/****************************************************************************/
/********** End of attribute decoding ***************************************/
/****************************************************************************/
/* To find the correct size of the PDU. Needed by the desegmentation feature*/
static guint
get_opsi_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
{
/*
* Get the length of the OPSI packet.
* We are guaranteed there're enough chars in tvb in order to
* extract the length value. No exception thrown !!
*/
return tvb_get_ntohs(tvb, offset + 4);
}
static int
get_opsi_attribute_index(int min, int max, int attribute_type)
{
int middle, at;
middle = (min+max)/2;
at = opsi_attributes[middle].attribute_type;
if (at == attribute_type) return middle;
if (attribute_type > at) {
return (middle == max) ? -1 : get_opsi_attribute_index(middle+1, max, attribute_type);
}
return (middle == min) ? -1 : get_opsi_attribute_index(min, middle-1, attribute_type);
}
static void
dissect_attributes(tvbuff_t *tvb, packet_info *pinfo, proto_tree *opsi_tree, int offset, int length)
{
int i;
int attribute_type;
int attribute_length;
proto_item *ti;
proto_tree *ntree = NULL;
while (length >= 4) {
attribute_type = tvb_get_ntohs(tvb, offset);
attribute_length = tvb_get_ntohs(tvb, offset+2);
if (attribute_length > length) break;
/* We perform a standard log(n) lookup */
i = get_opsi_attribute_index(0, OPSI_ATTRIBUTES_COUNT-1, attribute_type);
if (i == -1) {
proto_tree_add_expert_format(opsi_tree, pinfo, &ei_opsi_unknown_attribute, tvb, offset, attribute_length,
"Unknown attribute (%d)", attribute_type);
}
else {
ntree = proto_tree_add_subtree_format(opsi_tree, tvb, offset, attribute_length, *opsi_attributes[i].tree_id, &ti,
"%s (%d)", opsi_attributes[i].tree_text, attribute_type);
proto_tree_add_item(ntree, hf_opsi_attribute_length, tvb, offset+2, 2, ENC_BIG_ENDIAN);
opsi_attributes[i].dissect(tvb, pinfo, ntree, ti, opsi_attributes[i].hf_type_attribute, offset, attribute_length);
}
if (attribute_length < 4) {
/* Length must be at least 4, for the type and length. */
break;
}
offset += attribute_length;
length -= attribute_length;
}
if (length) {
proto_tree_add_expert(opsi_tree, pinfo, &ei_opsi_short_frame, tvb, offset, -1);
}
}
static int
dissect_opsi_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_item *ti;
proto_tree *opsi_tree;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "OPSI");
col_clear(pinfo->cinfo, COL_INFO);
col_append_sep_str(pinfo->cinfo, COL_INFO, ", ",
val_to_str(tvb_get_guint8(tvb, CODE_OFFSET), opsi_opcode,
"<Unknown opcode %d>"));
col_set_fence(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_opsi, tvb, 0, -1, ENC_NA);
opsi_tree = proto_item_add_subtree(ti, ett_opsi);
if (opsi_tree) {
proto_tree_add_item(opsi_tree, hf_opsi_major_version, tvb, MAJOR_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(opsi_tree, hf_opsi_minor_version, tvb, MINOR_VERSION_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(opsi_tree, hf_opsi_opcode, tvb, CODE_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(opsi_tree, hf_opsi_hook_id, tvb, HOOK_ID_OFFSET, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(opsi_tree, hf_opsi_length, tvb, PACKET_LENGTH_OFFSET, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(opsi_tree, hf_opsi_session_id, tvb, SESSION_OFFSET, 2, ENC_BIG_ENDIAN);
}
dissect_attributes(tvb, pinfo, opsi_tree, HEADER_LENGTH, MIN(((int)tvb_reported_length(tvb)-HEADER_LENGTH), (tvb_get_ntohs(tvb, PACKET_LENGTH_OFFSET)-HEADER_LENGTH)));
return tvb_reported_length(tvb);
}
static int
dissect_opsi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
/* We should mimimally grab the header */
tcp_dissect_pdus(tvb, pinfo, tree, opsi_desegment, HEADER_LENGTH, get_opsi_pdu_len,
dissect_opsi_pdu, data);
return tvb_reported_length(tvb);
}
void
proto_register_opsi(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_opsi_major_version,
{ "Major version", "opsi.major",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_opsi_minor_version,
{ "Minor version", "opsi.minor",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_opsi_opcode,
{ "Operation code", "opsi.opcode",
FT_UINT8, BASE_DEC, VALS(opsi_opcode), 0x0,
NULL, HFILL }
},
{ &hf_opsi_hook_id,
{ "Hook ID", "opsi.hook",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_opsi_length,
{ "Message length", "opsi.length",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_opsi_session_id,
{ "Session ID", "opsi.session_id",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_user_name_att,
{ "User name", "opsi.attr.user_name",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_password_att,
{ "User password", "opsi.attr.password",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_chap_password_att,
{ "CHAP password attribute", "opsi.attr.chap_password",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nas_ip_add_att,
{ "NAS IP address", "opsi.attr.nas_ip_addr",
FT_IPv4, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nas_port_att,
{ "NAS port", "opsi.attr.nas_port",
FT_UINT32, BASE_HEX, NULL, 0x00,
NULL, HFILL }
},
{ &hf_service_type_att,
{ "Service type", "opsi.attr.service_type",
FT_UINT32, BASE_DEC, VALS(opsi_service_type_code), 0x0,
NULL, HFILL }
},
{ &hf_framed_protocol_att,
{ "Framed protocol", "opsi.attr.framed_protocol",
FT_UINT32, BASE_DEC, VALS(opsi_framed_protocol_code), 0x0,
NULL, HFILL }
},
{ &hf_framed_address_att,
{ "Framed address", "opsi.attr.framed_address",
FT_IPv4, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_framed_netmask_att,
{ "Framed netmask", "opsi.attr.framed_netmask",
FT_IPv4, BASE_NETMASK, NULL, 0x00,
NULL, HFILL }
},
{ &hf_framed_routing_att,
{ "Framed routing", "opsi.attr.framed_routing",
FT_UINT32, BASE_DEC, VALS(opsi_framed_routing_code), 0x0,
NULL, HFILL }
},
{ &hf_framed_filter_att,
{ "Framed filter", "opsi.attr.framed_filter",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_framed_mtu_att,
{ "Framed MTU", "opsi.attr.framed_mtu",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_framed_compression_att,
{ "Framed compression", "opsi.attr.framed_compression",
FT_UINT32, BASE_DEC, VALS(opsi_framed_compression_code), 0x0,
NULL, HFILL }
},
{ &hf_called_station_att,
{ "Called station ID", "opsi.attr.called_station_id",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_calling_station_att,
{ "Calling station ID", "opsi.attr.calling_station_id",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nas_identifier_att,
{ "NAS ID", "opsi.attr.nas_id",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_accounting_att,
{ "Accounting", "opsi.attr.accounting",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_acct_session_id_att,
{ "Accounting session ID", "opsi.attr.acct.session_id",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_chap_challenge_att,
{ "CHAP challenge", "opsi.attr.chap_challenge",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nas_port_type_att,
{ "NAS port type", "opsi.attr.nas_port_type",
FT_UINT32, BASE_DEC, VALS(opsi_nas_port_type_code), 0x0,
NULL, HFILL }
},
{ &hf_designation_num_att,
{ "Designation number", "opsi.attr.designation_number",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nas_port_id_att,
{ "NAS port ID", "opsi.attr.nas_port_id",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_aaa_id_att,
{ "SMC AAA ID", "opsi.attr.smc_aaa_id",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_vpn_id_att,
{ "SMC VPN ID", "opsi.attr.smc_vpn_id",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_vpn_name_att,
{ "SMC VPN name", "opsi.attr.smc_vpn_name",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_ran_id_att,
{ "SMC RAN ID", "opsi.attr.smc_ran_id",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_ran_ip_att,
{ "SMC RAN IP address", "opsi.attr.smc_ran_ip",
FT_IPv4, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_ran_name_att,
{ "SMC RAN name", "opsi.attr.smc_ran_name",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_pop_id_att,
{ "SMC POP id", "opsi.attr.smc_pop_id",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_pop_name_att,
{ "SMC POP name", "opsi.attr.smc_pop_name",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_id_att,
{ "SMC ID", "opsi.attr.smc_id",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_receive_time_att,
{ "SMC receive time", "opsi.attr.smc_receive_time",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
NULL, HFILL }
},
{ &hf_smc_stat_time_att,
{ "SMC stat time", "opsi.attr.smc_stat_time",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_opsi_flags_att,
{ "OPSI flags", "opsi.attr.flags",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_opsi_application_name_att,
{ "OPSI application name", "opsi.attr.application_name",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_opsi_attribute_length,
{ "Length", "opsi.attr_length",
FT_UINT16, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_opsi,
&ett_opsi_user_name,
&ett_opsi_user_password,
&ett_opsi_chap_password,
&ett_opsi_nas_ip_address,
&ett_opsi_nas_port,
&ett_opsi_service_type,
&ett_opsi_framed_protocol,
&ett_opsi_framed_address,
&ett_opsi_framed_netmask,
&ett_opsi_framed_routing,
&ett_opsi_framed_filter,
&ett_opsi_framed_mtu,
&ett_opsi_framed_compression,
&ett_opsi_called_station_id,
&ett_opsi_calling_station_id,
&ett_opsi_nas_identifier,
&ett_opsi_accounting,
&ett_opsi_acct_session_id,
&ett_opsi_chap_challenge,
&ett_opsi_nas_port_type,
&ett_opsi_designation_number,
&ett_opsi_nas_port_id,
&ett_opsi_smc_aaa_id,
&ett_opsi_smc_vpn_id,
&ett_opsi_smc_vpn_name,
&ett_opsi_smc_ran_id,
&ett_opsi_smc_ran_ip,
&ett_opsi_smc_ran_name,
&ett_opsi_smc_pop_id,
&ett_opsi_smc_pop_name,
&ett_opsi_smc_id,
&ett_opsi_smc_receive_time,
&ett_opsi_smc_stat_time,
&ett_opsi_flags,
&ett_opsi_application_name,
};
static ei_register_info ei[] = {
{ &ei_opsi_unknown_attribute, { "opsi.attr_unknown", PI_PROTOCOL, PI_WARN, "Unknown attribute", EXPFILL }},
{ &ei_opsi_short_attribute, { "opsi.attr_too_short", PI_MALFORMED, PI_WARN, "Too short attribute!", EXPFILL }},
{ &ei_opsi_short_frame, { "opsi.short_frame", PI_MALFORMED, PI_WARN, "Short frame", EXPFILL }},
};
/* For desegmentation / reassembly */
module_t *opsi_module;
expert_module_t* expert_opsi;
/* Register the protocol name and description */
proto_opsi = proto_register_protocol("Open Policy Service Interface",
"OPSI", "opsi");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_opsi, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_opsi = expert_register_protocol(proto_opsi);
expert_register_field_array(expert_opsi, ei, array_length(ei));
/* We activate the desegmentation / reassembly feature */
opsi_module = prefs_register_protocol(proto_opsi, NULL);
prefs_register_bool_preference(opsi_module, "desegment_opsi_messages",
"Reassemble OPSI messages spanning multiple TCP segments",
"Whether the OPSI dissector should desegment all messages spanning multiple TCP segments",
&opsi_desegment);
}
void
proto_reg_handoff_opsi(void)
{
dissector_handle_t opsi_handle;
opsi_handle = create_dissector_handle(dissect_opsi, proto_opsi);
dissector_add_uint_with_preference("tcp.port", TCP_PORT_OPSI, opsi_handle);
}
/*
* Editor modelines - https://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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