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wireshark/epan/dissectors/packet-megaco.c

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/* packet-megaco.c
* Routines for megaco packet disassembly
* RFC 3015
*
* Christian Falckenberg, 2002/10/17
* Copyright (c) 2002 by Christian Falckenberg
* <christian.falckenberg@nortelnetworks.com>
*
* Christoph Wiest, 2003/06/28
* Modified 2003 by Christoph Wiest
* <ch.wiest@tesionmail.de>
* Modified 2004 by Anders Broman
* <anders.broman@ericsson.com>
* To handle TPKT headers if over TCP
* Modified 2005 by Karl Knoebl
* <karl.knoebl@siemens.com>
* provide info to COL_INFO and some "prettification"
*
* Copyright (c) 2006 Anders Broman <anders.broman@ericsson.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1999 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <stdlib.h>
#include <epan/packet.h>
#include <epan/exceptions.h>
#include <epan/tap.h>
#include <epan/rtd_table.h>
#include <epan/prefs.h>
#include <epan/prefs-int.h>
#include <epan/exported_pdu.h>
#include <epan/asn1.h>
#include <epan/sctpppids.h>
#include <wsutil/strtoi.h>
#include "packet-ber.h"
#include "packet-tpkt.h"
#include "packet-h245.h"
#include "packet-h248.h"
#include "packet-ip.h"
#include "packet-http.h"
#include "packet-sdp.h"
void proto_register_megaco(void);
void proto_reg_handoff_megaco(void);
#define PORT_MEGACO_TXT 2944
#define PORT_MEGACO_BIN 2945
static pref_t *sip_hide_generated_call_ids;
/* Define the megaco proto */
static int proto_megaco = -1;
/* Define headers for megaco */
static int hf_megaco_start = -1;
static int hf_megaco_version = -1;
static int hf_megaco_transaction = -1;
static int hf_megaco_transid = -1;
static int hf_megaco_Context = -1;
/* static int hf_megaco_command_line = -1; */
static int hf_megaco_command = -1;
static int hf_megaco_command_optional = -1;
static int hf_megaco_wildcard_response = -1;
static int hf_megaco_termid = -1;
/* Define headers in subtree for megaco */
static int hf_megaco_modem_descriptor = -1;
static int hf_megaco_multiplex_descriptor = -1;
static int hf_megaco_media_descriptor = -1;
static int hf_megaco_Local_descriptor = -1;
static int hf_megaco_events_descriptor = -1;
static int hf_megaco_signal_descriptor = -1;
static int hf_megaco_audit_descriptor = -1;
/* static int hf_megaco_servicechange_descriptor = -1; */
static int hf_megaco_digitmap_descriptor = -1;
static int hf_megaco_statistics_descriptor = -1;
static int hf_megaco_observedevents_descriptor = -1;
static int hf_megaco_topology_descriptor = -1;
static int hf_megaco_error_descriptor = -1;
static int hf_megaco_error_code = -1;
static int hf_megaco_error_string = -1;
static int hf_megaco_TerminationState_descriptor= -1;
static int hf_megaco_Remote_descriptor = -1;
static int hf_megaco_LocalControl_descriptor = -1;
static int hf_megaco_packages_descriptor = -1;
static int hf_megaco_Service_State = -1;
static int hf_megaco_Event_Buffer_Control = -1;
static int hf_megaco_mode = -1;
static int hf_megaco_reserve_group = -1;
static int hf_megaco_h324_muxtbl_in = -1;
static int hf_megaco_h324_muxtbl_out = -1;
static int hf_megaco_ds_dscp = -1;
static int hf_megaco_gm_saf = -1;
static int hf_megaco_gm_sam = -1;
static int hf_megaco_gm_spf = -1;
static int hf_megaco_gm_spr = -1;
static int hf_megaco_gm_esas = -1;
static int hf_megaco_tman_pol = -1;
static int hf_megaco_gm_rsb = -1;
static int hf_megaco_tman_sdr = -1;
static int hf_megaco_tman_mbs = -1;
static int hf_megaco_tman_pdr = -1;
static int hf_megaco_tman_dvt = -1;
static int hf_megaco_ipdc_realm = -1;
static int hf_megaco_h324_h223capr = -1;
static int hf_megaco_reserve_value = -1;
static int hf_megaco_streamid = -1;
static int hf_megaco_requestid = -1;
static int hf_megaco_pkgdname = -1;
static int hf_megaco_mId = -1;
static int hf_megaco_h245 = -1;
static int hf_megaco_h223Capability = -1;
static int hf_megaco_audititem = -1;
static int hf_megaco_priority = -1;
/* Define the trees for megaco */
static int ett_megaco = -1;
static int ett_megaco_message = -1;
static int ett_megaco_message_body = -1;
static int ett_megaco_context = -1;
static int ett_megaco_command_line = -1;
static int ett_megaco_mediadescriptor = -1;
static int ett_megaco_descriptors = -1;
static int ett_megaco_raw_text = -1;
static int ett_megaco_error_descriptor = -1;
static int ett_megaco_TerminationState = -1;
static int ett_megaco_Localdescriptor = -1;
static int ett_megaco_Remotedescriptor = -1;
static int ett_megaco_LocalControldescriptor = -1;
static int ett_megaco_auditdescriptor = -1;
static int ett_megaco_eventsdescriptor = -1;
static int ett_megaco_statisticsdescriptor = -1;
static int ett_megaco_observedeventsdescriptor = -1;
static int ett_megaco_observedevent = -1;
static int ett_megaco_packagesdescriptor = -1;
static int ett_megaco_requestedevent = -1;
static int ett_megaco_signalsdescriptor = -1;
static int ett_megaco_requestedsignal = -1;
static int ett_megaco_h245 = -1;
static gcp_hf_ett_t megaco_ctx_ids = {{-1,-1,-1,-1,-1,-1},{-1,-1,-1,-1}};
static expert_field ei_megaco_errored_command = EI_INIT;
static expert_field ei_megaco_no_command = EI_INIT;
static expert_field ei_megaco_no_descriptor = EI_INIT;
static expert_field ei_megaco_error_descriptor_transaction_list = EI_INIT;
static expert_field ei_megaco_parse_error = EI_INIT;
static expert_field ei_megaco_audit_descriptor = EI_INIT;
static expert_field ei_megaco_signal_descriptor = EI_INIT;
static expert_field ei_megaco_reason_invalid = EI_INIT;
static expert_field ei_megaco_error_code_invalid = EI_INIT;
static expert_field ei_megaco_invalid_sdr = EI_INIT;
static dissector_handle_t megaco_text_handle;
static int megaco_tap = -1;
static gint exported_pdu_tap = -1;
/* patterns used for tvb_ws_mempbrk_pattern_guint8 */
static ws_mempbrk_pattern pbrk_whitespace;
static ws_mempbrk_pattern pbrk_braces;
/* Used when command type is needed to diferentiate parsing, extend as needed */
typedef enum
{
MEGACO_CMD_NOT_SET = 0,
MEGACO_CMD_PRIORITY,
} megaco_commands_enum_t;
/*
* Here are the global variables associated with
* the various user definable characteristics of the dissection
*
* MEGACO has two kinds of message formats: text and binary
*
* global_megaco_raw_text determines whether we are going to display
* the raw text of the megaco message, much like the HTTP dissector does.
*
* global_megaco_dissect_tree determines whether we are going to display
* a detailed tree that expresses a somewhat more semantically meaningful
* decode.
*/
static guint global_megaco_txt_sctp_port = PORT_MEGACO_TXT;
#if 0
static guint global_megaco_bin_sctp_port = PORT_MEGACO_BIN;
static guint global_megaco_bin_tcp_port = PORT_MEGACO_BIN;
static guint global_megaco_bin_udp_port = PORT_MEGACO_BIN;
#endif
static gboolean global_megaco_raw_text = TRUE;
static gboolean global_megaco_dissect_tree = TRUE;
static const value_string megaco_context_vals[] = {
{ CHOOSE_CONTEXT, "Choose one" },
{ ALL_CONTEXTS, "All" },
{ NULL_CONTEXT, "NULL" },
{ 0, NULL }
};
/* Some basic utility functions that are specific to this dissector */
static gint megaco_tvb_skip_wsp(tvbuff_t *tvb, gint offset);
static gint megaco_tvb_skip_wsp_return(tvbuff_t *tvb, gint offset);
#define NUM_TIMESTATS 12
static const value_string megaco_message_type[] = {
{ 0, "ADD "},
{ 1, "MOVE"},
{ 2, "MDFY"},
{ 3, "SUBT"},
{ 4, "AUCP"},
{ 5, "AUVL"},
{ 6, "NTFY"},
{ 7, "SVCC"},
{ 8, "TOPO"},
{ 9, "NONE"},
{ 10, "ALL "},
{ 0, NULL}
};
#define GCP_CMD_REPLY_CASE \
case GCP_CMD_ADD_REPLY: \
case GCP_CMD_MOVE_REPLY: \
case GCP_CMD_MOD_REPLY: \
case GCP_CMD_SUB_REPLY: \
case GCP_CMD_AUDITCAP_REPLY: \
case GCP_CMD_AUDITVAL_REPLY: \
case GCP_CMD_NOTIFY_REPLY: \
case GCP_CMD_SVCCHG_REPLY: \
case GCP_CMD_TOPOLOGY_REPLY: \
case GCP_CMD_REPLY:
#define GCP_CMD_REQ_CASE \
case GCP_CMD_ADD_REQ: \
case GCP_CMD_MOVE_REQ: \
case GCP_CMD_MOD_REQ: \
case GCP_CMD_SUB_REQ: \
case GCP_CMD_AUDITCAP_REQ: \
case GCP_CMD_AUDITVAL_REQ: \
case GCP_CMD_NOTIFY_REQ: \
case GCP_CMD_SVCCHG_REQ: \
case GCP_CMD_TOPOLOGY_REQ: \
case GCP_CMD_CTX_ATTR_AUDIT_REQ: \
case GCP_CMD_OTHER_REQ:
static gboolean
megacostat_is_duplicate_reply(const gcp_cmd_t* cmd)
{
switch (cmd->type) {
GCP_CMD_REPLY_CASE
{
gcp_cmd_msg_t *cmd_msg;
/* cycle through commands to find same command in the transaction */
for (cmd_msg = cmd->trx->cmds;
(cmd_msg != NULL) && (cmd_msg->cmd->msg->framenum != cmd->msg->framenum);
cmd_msg = cmd_msg->next) {
if (cmd_msg->cmd->type == cmd->type)
return TRUE;
}
return FALSE;
}
break;
default:
return FALSE;
break;
}
}
static gboolean
megacostat_had_request(const gcp_cmd_t* cmd)
{
switch (cmd->type) {
GCP_CMD_REPLY_CASE
{
gcp_cmd_msg_t *cmd_msg;
/* cycle through commands to find a request in the transaction */
for (cmd_msg = cmd->trx->cmds;
(cmd_msg != NULL) && (cmd_msg->cmd->msg->framenum != cmd->msg->framenum);
cmd_msg = cmd_msg->next) {
switch (cmd_msg->cmd->type) {
GCP_CMD_REQ_CASE
return TRUE;
break;
default:
return FALSE;
break;
}
}
return FALSE;
}
break;
default:
return FALSE;
break;
}
}
static void
megacostat_filtercheck(const char *opt_arg _U_, const char **filter _U_, char** err)
{
pref_t *megaco_ctx_track, *h248_ctx_track;
megaco_ctx_track = prefs_find_preference(prefs_find_module("megaco"), "ctx_info");
h248_ctx_track = prefs_find_preference(prefs_find_module("h248"), "ctx_info");
if (!megaco_ctx_track || !h248_ctx_track) {
/* No such preferences */
return;
}
if (!prefs_get_bool_value(megaco_ctx_track, pref_current) || !prefs_get_bool_value(h248_ctx_track, pref_current)) {
*err = ws_strdup_printf("Track Context option at Protocols -> MEGACO and Protocols -> H248 preferences\n"
"has to be set to true to enable measurement of service response times.\n");
}
}
static tap_packet_status
megacostat_packet(void *pms, packet_info *pinfo, epan_dissect_t *edt _U_, const void *pmi)
{
rtd_data_t* rtd_data = (rtd_data_t*)pms;
rtd_stat_table* ms = &rtd_data->stat_table;
const gcp_cmd_t *mi=(const gcp_cmd_t*)pmi;
nstime_t delta;
tap_packet_status ret = TAP_PACKET_DONT_REDRAW;
switch (mi->type) {
GCP_CMD_REQ_CASE
if(!mi->trx->initial) {
/* Track Context is probably disabled, we cannot
* measure service response time */
return TAP_PACKET_DONT_REDRAW;
}
else if(mi->trx->initial->framenum != mi->msg->framenum){
/* Duplicate is ignored */
ms->time_stats[0].req_dup_num++;
}
else {
ms->time_stats[0].open_req_num++;
}
break;
GCP_CMD_REPLY_CASE
if(megacostat_is_duplicate_reply(mi)){
/* Duplicate is ignored */
ms->time_stats[0].rsp_dup_num++;
}
else if (!megacostat_had_request(mi)) {
/* no request was seen */
ms->time_stats[0].disc_rsp_num++;
}
else {
ms->time_stats[0].open_req_num--;
/* calculate time delta between request and response */
nstime_delta(&delta, &pinfo->abs_ts, &mi->trx->initial->frametime);
switch(mi->type) {
case GCP_CMD_ADD_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[0]),&delta, pinfo);
break;
case GCP_CMD_MOVE_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[1]),&delta, pinfo);
break;
case GCP_CMD_MOD_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[2]),&delta, pinfo);
break;
case GCP_CMD_SUB_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[3]),&delta, pinfo);
break;
case GCP_CMD_AUDITCAP_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[4]),&delta, pinfo);
break;
case GCP_CMD_AUDITVAL_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[5]),&delta, pinfo);
break;
case GCP_CMD_NOTIFY_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[6]),&delta, pinfo);
break;
case GCP_CMD_SVCCHG_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[7]),&delta, pinfo);
break;
case GCP_CMD_TOPOLOGY_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[8]),&delta, pinfo);
break;
case GCP_CMD_REPLY:
time_stat_update(&(ms->time_stats[0].rtd[9]),&delta, pinfo);
break;
default:
time_stat_update(&(ms->time_stats[0].rtd[11]),&delta, pinfo);
}
time_stat_update(&(ms->time_stats[0].rtd[10]),&delta, pinfo);
ret = TAP_PACKET_REDRAW;
}
break;
default:
break;
}
return ret;
}
/* Call the export PDU tap with relevant data */
static void
export_megaco_pdu(packet_info *pinfo, tvbuff_t *tvb)
{
exp_pdu_data_t *exp_pdu_data = export_pdu_create_common_tags(pinfo, "megaco", EXP_PDU_TAG_PROTO_NAME);
exp_pdu_data->tvb_captured_length = tvb_captured_length(tvb);
exp_pdu_data->tvb_reported_length = tvb_reported_length(tvb);
exp_pdu_data->pdu_tvb = tvb;
tap_queue_packet(exported_pdu_tap, pinfo, exp_pdu_data);
}
/*
* The various functions that either dissect some
* subpart of MEGACO. These aren't really proto dissectors but they
* are written in the same style.
*
*/
static void
dissect_megaco_descriptors(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_descriptors_start_offset, gint tvb_descriptors_end_offset, proto_tree *top_tree, guint32 context);
static void
dissect_megaco_digitmapdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset);
static void
dissect_megaco_topologydescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset);
static void
dissect_megaco_errordescriptor(tvbuff_t *tvb, packet_info* pinfo, proto_tree *tree, gint tvb_RBRKT, gint tvb_previous_offset);
static void
dissect_megaco_TerminationStatedescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_next_offset, gint tvb_current_offset);
static void
dissect_megaco_LocalRemotedescriptor(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset, guint32 context, gboolean is_local);
static void
dissect_megaco_LocalControldescriptor(tvbuff_t *tvb, proto_tree *tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset, proto_tree *top_tree);
static void
dissect_megaco_Packagesdescriptor(tvbuff_t *tvb, proto_tree *tree, gint tvb_next_offset, gint tvb_current_offset);
static void
tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree);
static int
dissect_megaco_text(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data);
static gint
megaco_tvb_find_token(tvbuff_t *tvb, gint offset, gint maxlength);
static dissector_handle_t data_handle;
static dissector_handle_t sdp_handle;
static dissector_handle_t h245_handle;
static dissector_handle_t h248_handle;
static dissector_handle_t h248_otp_handle;
static gboolean keep_persistent_data = FALSE;
/*
* dissect_megaco_text over TCP, there will be a TPKT header there
*
*/
static int dissect_megaco_text_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int lv_tpkt_len;
/* This code is copied from the Q.931 dissector, some parts skipped.
* Check whether this looks like a TPKT-encapsulated
* MEGACO packet.
*
* The minimum length of a MEGACO message is 6?:
* Re-assembly ?
*/
lv_tpkt_len = is_tpkt(tvb, 6);
if (lv_tpkt_len == -1) {
/*
* It's not a TPKT packet;
* Is in MEGACO ?
*/
dissect_megaco_text(tvb, pinfo, tree, data);
}
dissect_tpkt_encap(tvb, pinfo, tree, TRUE,
megaco_text_handle);
return tvb_captured_length(tvb);
}
#define ERRORTOKEN 1
#define TRANSTOKEN 2
#define REPLYTOKEN 3
#define PENDINGTOKEN 4
#define RESPONSEACKTOKEN 5
typedef struct {
const char *name;
const char *compact_name;
} megaco_tokens_t;
static const megaco_tokens_t megaco_messageBody_names[] = {
{ "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */
{ "Error", "ER" }, /* 1 */
{ "Transaction", "T" }, /* 2 */
{ "Reply", "P" }, /* 3 */
{ "Pending", "PN" }, /* 4 */
{ "TransactionResponseAck", "K" }, /* 5 */
};
/* Returns index of megaco_tokens_t */
static gint find_megaco_messageBody_names(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(megaco_messageBody_names); i++) {
if (header_len == strlen(megaco_messageBody_names[i].name) &&
tvb_strncaseeql(tvb, offset, megaco_messageBody_names[i].name, header_len) == 0)
return i;
if (megaco_messageBody_names[i].compact_name != NULL &&
header_len == strlen(megaco_messageBody_names[i].compact_name) &&
tvb_strncaseeql(tvb, offset, megaco_messageBody_names[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
static proto_item *
megaco_tree_add_string(proto_tree *tree, int hfindex, tvbuff_t *tvb,
gint start, gint length, const char *value)
{
proto_item *pi;
pi = proto_tree_add_string(tree, hfindex, tvb, start, length, value);
if (!global_megaco_dissect_tree) {
proto_item_set_hidden(pi);
}
return(pi);
}
static proto_item *
my_proto_tree_add_uint(proto_tree *tree, int hfindex, tvbuff_t *tvb,
gint start, gint length, guint32 value)
{
proto_item *pi;
pi = proto_tree_add_uint(tree, hfindex, tvb, start, 1, value);
/* String length may be longer than FT_UINT will allow */
proto_item_set_len(pi, length);
if (!global_megaco_dissect_tree) {
proto_item_set_hidden(pi);
}
return(pi);
}
/*
* dissect_megaco_text - The dissector for the MEGACO Protocol, using
* text encoding.
*/
static int
dissect_megaco_text(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
gint tvb_len, len;
gint tvb_offset,tvb_current_offset,tvb_previous_offset,tvb_next_offset,tokenlen;
gint context_offset, context_length, save_offset, save_length;
gint tvb_command_start_offset, tvb_command_end_offset;
gint tvb_descriptors_start_offset, tvb_descriptors_end_offset;
gint tvb_transaction_end_offset;
proto_tree *megaco_tree, *message_body_tree, *megaco_tree_command_line, *ti, *sub_ti;
guint8 word[15];
guint8 TermID[30];
guint8 tempchar;
gint tvb_RBRKT, tvb_LBRKT, RBRKT_counter, LBRKT_counter;
guint token_index=0;
guint32 dword;
guchar needle;
gcp_msg_t *msg = NULL;
gcp_trx_t *trx = NULL;
gcp_ctx_t *ctx = NULL;
gcp_cmd_t *cmd = NULL;
gcp_term_t *term = NULL;
gcp_trx_type_t trx_type = GCP_TRX_NONE;
guint32 trx_id = 0, pending_id;
guint32 ctx_id = 0;
gcp_cmd_type_t cmd_type = GCP_CMD_NONE;
gcp_wildcard_t wild_term = GCP_WILDCARD_NONE;
gboolean short_form;
megaco_commands_enum_t megaco_command = MEGACO_CMD_NOT_SET;
/* Initialize variables */
tvb_len = tvb_reported_length(tvb);
megaco_tree = NULL;
ti = NULL;
tvb_offset = 0;
RBRKT_counter = 0;
LBRKT_counter = 0;
/* Check if H.248 in otp(Erlang) internal format
* XXX Needs improvement?
* Ref:
* http://www.erlang.org/doc/apps/megaco/part_frame.html
* 4.1 Internal form of messages
* 4.2 The different encodings
*/
dword = tvb_get_ntoh24(tvb,0);
if ((dword == 0x836803)&&(h248_otp_handle)){
call_dissector(h248_otp_handle, tvb, pinfo, tree);
return tvb_captured_length(tvb);
}
msg = gcp_msg(pinfo, tvb_raw_offset(tvb), keep_persistent_data);
/*
* Check to see whether we're really dealing with MEGACO by looking
* for the "MEGACO" string or a "!".This needs to be improved when supporting
* binary encodings. Bugfix add skipping of leading spaces.
*/
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset);
/* Quick fix for MEGACO not following the RFC, hopefully not breaking any thing
* Turned out to be TPKT in case of TCP, added some code to handle that.
*
* tvb_offset = tvb_find_guint8(tvb, tvb_offset, 5, 'M');
*/
if(!tvb_get_nstringz0(tvb,tvb_offset,sizeof(word),word)) return tvb_captured_length(tvb);
/* Quick fix for MEGACO packet with Authentication Header,
* marked as "AU" or "Authentication".
*/
if ((g_ascii_strncasecmp(word, "Authentication", 14) == 0) ||
(g_ascii_strncasecmp(word, "AU", 2) == 0)) {
gint counter;
guint8 next;
/* move offset to end of auth header (EOL or WSP) */
for ( counter = tvb_offset; counter < tvb_len; counter++ ) {
needle = tvb_get_guint8(tvb, counter);
if (needle == ' ' || needle == '\r' || needle == '\n') {
next = tvb_get_guint8(tvb, counter+1);
if (next == ' ' || next == '\r' || next == '\n') {
continue;
}
tvb_offset = counter + 1;
break;
}
}
}
short_form = (tvb_get_guint8(tvb, tvb_offset ) == '!');
if (g_ascii_strncasecmp(word, "MEGACO", 6) != 0 && !short_form){
gint8 ber_class;
gboolean pc;
gint32 tag;
dissector_handle_t handle = data_handle;
get_ber_identifier(tvb, 0, &ber_class, &pc, &tag);
if (ber_class == BER_CLASS_UNI && pc && tag == BER_UNI_TAG_SEQUENCE ) {
handle = h248_handle;
}
call_dissector(handle,tvb,pinfo,tree);
return tvb_captured_length(tvb);
}
/* Display MEGACO in protocol column */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MEGACO");
/* Report this packet to the tap */
if (!pinfo->flags.in_error_pkt) {
if (have_tap_listener(exported_pdu_tap)) {
export_megaco_pdu(pinfo, tvb);
}
}
/* Build the info tree if we've been given a root */
/* Create megaco subtree */
ti = proto_tree_add_item(tree,proto_megaco,tvb, 0, -1, ENC_NA);
megaco_tree = proto_item_add_subtree(ti, ett_megaco);
/* Format of 'message' is = MegacopToken SLASH Version SEP mId SEP messageBody */
/* MegacopToken = "MEGACO" or "!" */
/* According to H248.1-200205 Annex B Text encoding ( protocol version 2 ) */
/* Find version */
tvb_previous_offset = tvb_find_guint8(tvb, 0,
tvb_len, '/');
if (tvb_previous_offset == -1) {
expert_add_info_format(pinfo, ti, &ei_megaco_parse_error,
"Sorry, no \"/\" in the MEGACO header, I can't parse this packet");
return tvb_captured_length(tvb);
}
megaco_tree_add_string(megaco_tree, hf_megaco_start, tvb, 0, tvb_previous_offset+1,
tvb_get_string_enc(wmem_packet_scope(), tvb, 0, tvb_previous_offset, ENC_UTF_8|ENC_NA));
/* skip / */
tvb_previous_offset++;
/* assume at least one digit in version */
tvb_current_offset = tvb_previous_offset + 1;
if (g_ascii_isdigit(tvb_get_guint8(tvb, tvb_current_offset))) {
/* 2-digit version */
tvb_current_offset++;
}
megaco_tree_add_string(megaco_tree, hf_megaco_version, tvb, tvb_previous_offset, tvb_current_offset - tvb_previous_offset,
tvb_get_string_enc(wmem_packet_scope(), tvb, tvb_previous_offset, tvb_current_offset - tvb_previous_offset, ENC_UTF_8|ENC_NA));
tvb_previous_offset = tvb_current_offset;
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset);
if (tvb_previous_offset == tvb_current_offset) {
expert_add_info_format(pinfo, ti, &ei_megaco_parse_error,
"[ Parse error: missing SEP in MEGACO header ]");
return tvb_current_offset;
}
tvb_previous_offset = tvb_current_offset;
/* mId should follow here,
* mId = (( domainAddress / domainName ) [":" portNumber]) / mtpAddress / deviceName
* domainAddress = "[" (IPv4address / IPv6address) "]"
* domainName = "<" (ALPHA / DIGIT) *63(ALPHA / DIGIT / "-" /".") ">"
* mtpAddress = MTPToken LBRKT 4*8 (HEXDIG) RBRKT
* MTPToken = ("MTP")
* deviceName = pathNAME
* pathNAME = ["*"] NAME *("/" / "*"/ ALPHA / DIGIT /"_" / "$" )["@" pathDomainName ]
*/
tvb_current_offset = tvb_ws_mempbrk_pattern_guint8(tvb, tvb_current_offset, -1, &pbrk_whitespace, &needle);
if (tvb_current_offset == -1) {
expert_add_info_format(pinfo, ti, &ei_megaco_parse_error,
"[ Parse error: no body in MEGACO message (missing SEP after mId) ]");
return tvb_captured_length(tvb);
}
tvb_next_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset);
/* At this point we should point to the "\n" ending the mId element
* or to the next character after white space SEP
*/
megaco_tree_add_string(megaco_tree, hf_megaco_mId, tvb, tvb_previous_offset, tvb_current_offset - tvb_previous_offset,
tvb_get_string_enc(wmem_packet_scope(), tvb, tvb_previous_offset, tvb_current_offset - tvb_previous_offset, ENC_UTF_8|ENC_NA));
col_clear(pinfo->cinfo, COL_INFO);
do{
tvb_previous_offset = tvb_next_offset;
/* Next part is
* : messageBody = ( errorDescriptor / transactionList )
* errorDescriptor = ErrorToken EQUAL ErrorCode LBRKT [quotedString] RBRKT
* ErrorToken = ("Error" / "ER")
*
* transactionList = 1*( transactionRequest / transactionReply /
* transactionPending / transactionResponseAck )
*
* transactionResponseAck = ResponseAckToken LBRKT
* transactionAck*(COMMA transactionAck) RBRKT
* ResponseAckToken = ("TransactionResponseAck"/ "K")
*
* transactionPending = PendingToken EQUAL TransactionID LBRKT RBRKT
* PendingToken = ("Pending" / "PN")
*
* transactionReply = ReplyToken EQUAL TransactionID LBRKT
* [ ImmAckRequiredToken COMMA]( errorDescriptor / actionReplyList ) RBRKT
* ReplyToken = ("Reply" / "P")
*
* transactionRequest = TransToken EQUAL TransactionID LBRKT
* actionRequest *(COMMA actionRequest) RBRKT
* TransToken = ("Transaction" / "T")
*/
/* Find token length */
for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_len-1; tvb_offset++){
if (!g_ascii_isalpha(tvb_get_guint8(tvb, tvb_offset ))){
break;
}
}
tokenlen = tvb_offset - tvb_previous_offset;
token_index = find_megaco_messageBody_names(tvb, tvb_previous_offset, tokenlen);
/* Debug code
ws_warning("token_index %u",token_index);
*/
tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_len, '{');
tvb_current_offset = tvb_LBRKT;
tvb_transaction_end_offset = megaco_tvb_find_token(tvb, tvb_LBRKT - 1, tvb_len);
switch ( token_index ){
/* errorDescriptor */
case ERRORTOKEN:
col_set_str(pinfo->cinfo, COL_INFO, "Error ");
tvb_current_offset = megaco_tvb_find_token(tvb, tvb_offset, tvb_len); /*tvb_find_guint8(tvb, tvb_offset+1, tvb_len, '}');*/
ti = proto_tree_add_format_text(megaco_tree, tvb, tvb_previous_offset, tvb_current_offset-tvb_previous_offset);
message_body_tree = proto_item_add_subtree(ti, ett_megaco_message_body);
if (tree) {
megaco_tree_add_string(message_body_tree, hf_megaco_transaction, tvb,
tvb_previous_offset, tokenlen,
"Error" );
tvb_command_start_offset = tvb_previous_offset;
dissect_megaco_errordescriptor(tvb, pinfo, megaco_tree, tvb_len-1, tvb_command_start_offset);
}
return tvb_captured_length(tvb);
/* transactionResponseAck
* transactionResponseAck = ResponseAckToken LBRKT transactionAck
* *(COMMA transactionAck) RBRKT
* transactionAck = transactionID / (transactionID "-" transactionID)
*/
case RESPONSEACKTOKEN:
tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_transaction_end_offset, '{');
tvb_offset = tvb_LBRKT;
save_offset = tvb_previous_offset;
save_length = tvb_current_offset-tvb_previous_offset;
megaco_tree_add_string(megaco_tree, hf_megaco_transaction, tvb,
save_offset, save_length, "TransactionResponseAck" );
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_offset+1);
tvb_current_offset = tvb_find_guint8(tvb, tvb_offset+1, tvb_len, '}');
/*tvb_current_offset = megaco_tvb_find_token(tvb, tvb_offset, tvb_transaction_end_offset);*/
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset)-1; /* cut last RBRKT */
len = tvb_current_offset - tvb_previous_offset;
pending_id = (guint)strtoul(tvb_format_text(pinfo->pool, tvb,tvb_previous_offset,len),NULL,10);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "%d TransactionResponseAck", pending_id);
my_proto_tree_add_uint(megaco_tree, hf_megaco_transid, tvb, save_offset, save_length, pending_id);
if(global_megaco_raw_text){
tvb_raw_text_add(tvb, megaco_tree);
}
return tvb_captured_length(tvb);
/* Pe and PN is transactionPending, P+"any char" is transactionReply */
case PENDINGTOKEN:
tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_transaction_end_offset, '=')+1;
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset);
tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_transaction_end_offset, '{');
tvb_current_offset = tvb_LBRKT;
save_offset = tvb_previous_offset;
save_length = tvb_current_offset-tvb_previous_offset;
megaco_tree_add_string(megaco_tree, hf_megaco_transaction, tvb,
save_offset, save_length, "Reply" );
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1);
len = tvb_current_offset - tvb_offset;
pending_id = (guint)strtoul(tvb_format_text(pinfo->pool, tvb,tvb_offset,len),NULL,10);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "%d Pending", pending_id);
my_proto_tree_add_uint(megaco_tree, hf_megaco_transid, tvb, save_offset, save_length, pending_id);
return tvb_captured_length(tvb);
/* transactionReply */
case REPLYTOKEN:
trx_type = GCP_TRX_REPLY;
tvb_LBRKT = tvb_find_guint8(tvb, tvb_offset, tvb_transaction_end_offset, '{');
save_offset = tvb_previous_offset;
save_length = tvb_LBRKT-tvb_previous_offset;
megaco_tree_add_string(megaco_tree, hf_megaco_transaction, tvb,
save_offset, save_length, "Reply" );
tvb_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_transaction_end_offset, '=')+1;
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset);
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_LBRKT-1);
len = tvb_current_offset - tvb_offset;
trx_id = (guint)strtoul(tvb_format_text(pinfo->pool, tvb,tvb_offset,len),NULL,10);
col_add_fstr(pinfo->cinfo, COL_INFO, "%d Reply ", trx_id);
my_proto_tree_add_uint(megaco_tree, hf_megaco_transid, tvb, save_offset, save_length, trx_id);
/* Find if we have a errorDescriptor or actionReplyList */
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
tempchar = tvb_get_guint8(tvb,tvb_offset);
if ((tempchar == 'E')||(tempchar == 'e')){
dissect_megaco_errordescriptor(tvb, pinfo, megaco_tree, tvb_transaction_end_offset-1, tvb_offset);
return tvb_captured_length(tvb);
}
/* Offset should be at first printable char after { */
tvb_previous_offset = tvb_offset;
break;
case TRANSTOKEN:
/* TransactionRequest */
trx_type = GCP_TRX_REQUEST;
save_offset = tvb_previous_offset;
save_length = tvb_current_offset-tvb_previous_offset;
megaco_tree_add_string(megaco_tree, hf_megaco_transaction, tvb,
save_offset, save_length, "Request" );
tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_transaction_end_offset, '=')+1;
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset);
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1);
len = tvb_current_offset - tvb_offset;
trx_id = (guint)strtoul(tvb_format_text(pinfo->pool, tvb,tvb_offset,len),NULL,10);
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "%d Request", trx_id);
my_proto_tree_add_uint(megaco_tree, hf_megaco_transid, tvb, save_offset, save_length, trx_id);
/* Offset should be at first printable char after { */
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
break;
default :
proto_tree_add_expert_format(tree, pinfo, &ei_megaco_error_descriptor_transaction_list, tvb, 0, -1,
"Sorry, can't understand errorDescriptor / transactionList = %s, can't parse it pos %u",
tvb_format_text(pinfo->pool, tvb,tvb_previous_offset,2),tvb_previous_offset);
return tvb_captured_length(tvb);
} /* end switch */
/* Only these remains now
* transactionReply = ReplyToken EQUAL TransactionID LBRKT
* [ ImmAckRequiredToken COMMA]( errorDescriptor / actionReplyList ) RBRKT
* ReplyToken = ("Reply" / "P")
*
* errorDescriptor = ErrorToken EQUAL ErrorCode
* LBRKT [quotedString] RBRKT
*
* transactionRequest = TransToken EQUAL TransactionID LBRKT
* actionRequest *(COMMA actionRequest) RBRKT
* TransToken = ("Transaction" / "T")
*/
trx = gcp_trx(msg , trx_id , trx_type, pinfo, keep_persistent_data);
/* Find Context */
nextcontext:
tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_transaction_end_offset, '{');
context_offset = tvb_previous_offset;
context_length = tvb_next_offset-tvb_previous_offset+1;
tvb_previous_offset = tvb_find_guint8(tvb, tvb_current_offset, tvb_transaction_end_offset, '=')+1;
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset);
if (tvb_current_offset >= tvb_next_offset) {
proto_tree_add_expert_format(megaco_tree, pinfo, &ei_megaco_parse_error,
tvb, context_offset, context_length, "Parse error: Invalid offset");
return tvb_captured_length(tvb);
}
tvb_current_offset = tvb_next_offset;
tokenlen = tvb_current_offset - tvb_previous_offset;
tempchar = tvb_get_guint8(tvb, tvb_previous_offset );
if (tvb_get_guint8(tvb, tvb_current_offset-1 ) == ' '){
tokenlen--;
}
switch ( tempchar ){
case '$':
ctx_id = CHOOSE_CONTEXT;
break;
case '*':
ctx_id = ALL_CONTEXTS;
break;
case '-':
ctx_id = NULL_CONTEXT;
break;
default:
ctx_id = (guint)strtoul(tvb_format_text(pinfo->pool, tvb, tvb_previous_offset, tokenlen),NULL,10);
}
my_proto_tree_add_uint(megaco_tree, hf_megaco_Context, tvb, context_offset, context_length, ctx_id);
col_append_fstr(pinfo->cinfo, COL_INFO, " |=%s", val_to_str(ctx_id, megaco_context_vals, "%d"));
ctx = gcp_ctx(msg,trx,ctx_id,pinfo,keep_persistent_data);
/* Find Commands */
/* If Transaction is is Request, Reply or Pending */
tvb_command_start_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1);
tvb_command_end_offset = tvb_command_start_offset;
tvb_LBRKT = tvb_command_start_offset;
tvb_RBRKT = tvb_command_start_offset;
/* The following loop find the individual contexts, commands and call the for every Descriptor a subroutine */
do {
tvb_command_end_offset = tvb_find_guint8(tvb, tvb_command_end_offset +1,
tvb_transaction_end_offset, ',');
if ( tvb_command_end_offset == -1 || tvb_command_end_offset > tvb_transaction_end_offset){
tvb_command_end_offset = tvb_transaction_end_offset ;
}
/* checking how many left brackets are before the next comma */
while ( tvb_find_guint8(tvb, tvb_LBRKT+1,tvb_transaction_end_offset, '{') != -1
&& (tvb_find_guint8(tvb, tvb_LBRKT+1,tvb_transaction_end_offset, '{') < tvb_command_end_offset)){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_transaction_end_offset, '{');
LBRKT_counter++;
}
/* checking how many right brackets are before the next comma */
while ( (tvb_find_guint8(tvb, tvb_RBRKT+1,tvb_transaction_end_offset, '}') != -1 )
&& (tvb_find_guint8(tvb, tvb_RBRKT+1,tvb_transaction_end_offset, '}') <= tvb_command_end_offset)
&& LBRKT_counter != 0){
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_transaction_end_offset, '}');
RBRKT_counter++;
}
/* If equal or more right brackets before the comma, one command is complete */
if ( LBRKT_counter <= RBRKT_counter ){
tvb_current_offset = tvb_find_guint8(tvb, tvb_command_start_offset,
tvb_transaction_end_offset, '{');
/* includes no descriptors */
if ( LBRKT_counter == 0 ){
tvb_current_offset = tvb_command_end_offset;
/* the last command in a context */
if ( tvb_find_guint8(tvb, tvb_command_start_offset, tvb_transaction_end_offset, '}') < tvb_current_offset
&& tvb_find_guint8(tvb, tvb_command_start_offset, tvb_transaction_end_offset, '}') != -1){
tvb_previous_offset = tvb_find_guint8(tvb, tvb_command_start_offset,
tvb_transaction_end_offset, '}');
len = tvb_previous_offset - tvb_command_start_offset;
tvb_previous_offset = megaco_tvb_skip_wsp_return(tvb, tvb_previous_offset -1);
tokenlen = tvb_previous_offset - tvb_command_start_offset;
}
/* not the last command in a context*/
else{
len = tvb_current_offset - tvb_command_start_offset;
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset -1);
tokenlen = tvb_current_offset - tvb_command_start_offset;
}
}
/* command includes descriptors */
else{
len = tvb_current_offset - tvb_command_start_offset;
tvb_current_offset = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset -1);
tokenlen = tvb_current_offset - tvb_command_start_offset;
}
/* if a next context is specified */
if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'C'){
tvb_current_offset = tvb_command_start_offset;
tvb_previous_offset = tvb_command_start_offset;
LBRKT_counter = 0;
RBRKT_counter = 0;
goto nextcontext;
}
megaco_tree_command_line = proto_tree_add_subtree(megaco_tree, tvb, tvb_command_start_offset, len+1, ett_megaco_command_line, &sub_ti, "Command: ");
megaco_command = MEGACO_CMD_NOT_SET;
/* creation of the megaco_tree_command_line additionally Command and Transaction ID will be printed in this line */
/* Changed to use the lines above. this code is saved if there is complaints
sub_ti = proto_tree_add_item(megaco_tree,hf_megaco_command_line,tvb,tvb_command_start_offset,tokenlen, ENC_UTF_8|ENC_NA);
megaco_tree_command_line = proto_item_add_subtree(sub_ti, ett_megaco_command_line);
*/
if (!global_megaco_dissect_tree) {
proto_item_set_hidden(sub_ti);
}
tvb_next_offset = tvb_command_start_offset + tokenlen;
/* Try to dissect Topology Descriptor before the command */
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset);
if ( (tempchar >= 'a')&& (tempchar <= 'z')){
tempchar = tempchar - 0x20;
}
if ( tempchar == 'T') {
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
if ( tempchar == 'P' || tempchar == 'O'){
gint tvb_topology_end_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_transaction_end_offset, '}');
if ( tvb_topology_end_offset == -1 ){
expert_add_info_format(pinfo, sub_ti, &ei_megaco_parse_error, "Parse error: Missing \"}\"");
return tvb_captured_length(tvb);
}
tvb_command_start_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_transaction_end_offset, '{');
if ( tvb_command_start_offset == -1 ){
expert_add_info_format(pinfo, sub_ti, &ei_megaco_parse_error, "Parse error: Missing \"{\"");
return tvb_captured_length(tvb);
}
dissect_megaco_topologydescriptor(tvb, megaco_tree_command_line, tvb_topology_end_offset-1, tvb_command_start_offset+1);
/* Command after Topology Descriptor */
tvb_command_start_offset = tvb_find_guint8(tvb, tvb_topology_end_offset + 1,
tvb_transaction_end_offset, ',');
if ( tvb_command_start_offset == -1 ){
/* No Command present after Topology Descriptor */
break;
} else {
/* Try to find the first char of the command */
tvb_command_start_offset = megaco_tvb_skip_wsp(tvb, tvb_command_start_offset + 1);
/*tvb_next_offset = tvb_find_guint8(tvb, tvb_command_start_offset, tvb_transaction_end_offset, '{');*/
continue;
}
}
}
/* Additional value */
if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'O'){
proto_tree_add_item(megaco_tree_command_line, hf_megaco_command_optional, tvb, tvb_command_start_offset, 2, ENC_NA);
tvb_command_start_offset = tvb_command_start_offset+2;
}
/* Additional value */
if ( tvb_get_guint8(tvb, tvb_command_start_offset ) == 'W'){
proto_tree_add_item(megaco_tree_command_line, hf_megaco_wildcard_response, tvb, tvb_command_start_offset, 2, ENC_NA );
tvb_command_start_offset = tvb_command_start_offset+2;
}
tvb_offset = tvb_find_guint8(tvb, tvb_command_start_offset,
tvb_transaction_end_offset, '=');
if (tvb_offset == -1 ) {
proto_tree_add_expert_format(megaco_tree, pinfo, &ei_megaco_parse_error, tvb, tvb_command_start_offset, len+1, "Parse error: Missing \"=\"");
return tvb_captured_length(tvb);
}
tvb_offset = megaco_tvb_skip_wsp_return(tvb, tvb_offset -1);
tokenlen = tvb_offset - tvb_command_start_offset;
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
if ( tempchar != 'E' ){
/* Short form used */
if (short_form){
switch ( tempchar ){
case 'A':
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
switch ( tempchar ){
case 'V':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITVAL_REPLY; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITVAL_REQ; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "AuditValue");
col_append_str(pinfo->cinfo, COL_INFO, " AuditValue");
proto_item_append_text(sub_ti, "AuditValue");
break;
case 'C':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITCAP_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITCAP_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "AuditCapability");
col_append_str(pinfo->cinfo, COL_INFO, " AuditCapability");
proto_item_append_text(sub_ti, "AuditCapability");
break;
default:
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_ADD_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_ADD_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Add");
col_append_str(pinfo->cinfo, COL_INFO, " Add");
proto_item_append_text(sub_ti, "Add");
break;
}
break;
case 'I':
/* "IEPS" */
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if(tempchar == 'E'){
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "IEPSCall");
col_append_str(pinfo->cinfo, COL_INFO, " IEPSCall");
proto_item_append_text(sub_ti, "IEPSCall");
}
cmd_type = GCP_CMD_NONE;
break;
case 'N':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_NOTIFY_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_NOTIFY_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Notify");
col_append_str(pinfo->cinfo, COL_INFO, " Notify");
proto_item_append_text(sub_ti, "Notify");
break;
case 'M':
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
switch ( tempchar ){
case 'F':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOD_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOD_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Modify");
col_append_str(pinfo->cinfo, COL_INFO, " Modify");
proto_item_append_text(sub_ti, "Modify");
break;
case 'V':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOVE_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOVE_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Move");
col_append_str(pinfo->cinfo, COL_INFO, " Move");
proto_item_append_text(sub_ti, "Move");
break;
}
break;
case 'P':
cmd_type = GCP_CMD_NONE;
/*
PackagesToken = ("Packages" / "PG")
PendingToken = ("Pending" / "PN")
PriorityToken = ("Priority" / "PR")
ProfileToken = ("Profile" / "PF")
*/
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
switch ( tempchar ){
case 'G':
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Packages");
col_append_str(pinfo->cinfo, COL_INFO, " Packages");
proto_item_append_text(sub_ti, "Packages");
break;
case 'N':
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Pending");
col_append_str(pinfo->cinfo, COL_INFO, " Pending");
proto_item_append_text(sub_ti, "Pending");
break;
case 'R':
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Priority");
col_append_str(pinfo->cinfo, COL_INFO, " Priority");
proto_item_append_text(sub_ti, "Priority");
megaco_command = MEGACO_CMD_PRIORITY;
break;
case 'F':
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Profile");
col_append_str(pinfo->cinfo, COL_INFO, " Profile");
proto_item_append_text(sub_ti, "Profile");
break;
}
break;
case 'S':
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset+1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
switch ( tempchar ){
case 'C':
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SVCCHG_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_SVCCHG_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "ServiceChange");
col_append_str(pinfo->cinfo, COL_INFO, " ServiceChange");
proto_item_append_text(sub_ti, "ServiceChange");
break;
default:
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SUB_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_SUB_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, "Subtract");
col_append_str(pinfo->cinfo, COL_INFO, " Subtract");
proto_item_append_text(sub_ti, "Subtract");
break;
}
break;
default:
proto_item_append_text(sub_ti, "<None> 0x%02x", tempchar);
expert_add_info(pinfo, sub_ti, &ei_megaco_no_command);
return tvb_captured_length(tvb);
}
}
else{
gchar* command = tvb_format_text(pinfo->pool, tvb, tvb_command_start_offset, tokenlen);
if ( g_str_equal(command,"Subtract") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SUB_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_SUB_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"AuditValue") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITVAL_REPLY; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITVAL_REQ; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"AuditCapability") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_AUDITCAP_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_AUDITCAP_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"Add") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_ADD_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_ADD_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"Notify") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_NOTIFY_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_NOTIFY_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"Modify") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOD_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOD_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"Move") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_MOVE_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_MOVE_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else if ( g_str_equal(command,"ServiceChange") ) {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_SVCCHG_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_SVCCHG_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
} else {
switch(trx_type) {
case GCP_TRX_REQUEST: cmd_type = GCP_CMD_OTHER_REQ; break;
case GCP_TRX_REPLY: cmd_type = GCP_CMD_REPLY; break;
default: cmd_type = GCP_CMD_NONE; break;
}
}
proto_tree_add_string(megaco_tree_command_line, hf_megaco_command, tvb,
tvb_command_start_offset, tokenlen, command);
col_append_fstr(pinfo->cinfo, COL_INFO, " %s", command);
proto_item_append_text(sub_ti, " %s", command);
}
if (cmd_type == GCP_CMD_NONE && trx_type == GCP_TRX_REPLY) {
cmd_type = GCP_CMD_REPLY;
}
if (cmd_type != GCP_CMD_NONE) {
cmd = gcp_cmd(msg, trx, ctx, cmd_type, tvb_command_start_offset, pinfo, keep_persistent_data);
tap_queue_packet(megaco_tap, pinfo, cmd);
}
tvb_offset = tvb_find_guint8(tvb, tvb_command_start_offset,
tvb_transaction_end_offset, '=');
if (tvb_offset == -1 ) {
expert_add_info_format(pinfo, sub_ti, &ei_megaco_parse_error, "Parse error: Missing \"=\"");
return tvb_captured_length(tvb);
}
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset+1);
tokenlen = tvb_next_offset - tvb_offset;
if (tokenlen+1 <= 0) {
expert_add_info_format(pinfo, sub_ti, &ei_megaco_parse_error, "Parse error: Invalid token length (%d)", tokenlen+1);
return tvb_captured_length(tvb);
}
tempchar = tvb_get_guint8(tvb, tvb_offset);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
term = wmem_new0(wmem_packet_scope(), gcp_term_t);
wild_term = GCP_WILDCARD_NONE;
term->type = GCP_TERM_TYPE_UNKNOWN;
switch ( tempchar ){
case 'E':
if ((tokenlen+1 > (int) sizeof(TermID))) {
expert_add_info_format(pinfo, sub_ti, &ei_megaco_parse_error, "Parse error: Invalid TermID length (%d)", tokenlen+1);
return tvb_captured_length(tvb);
}
tvb_get_nstringz0(tvb,tvb_offset,tokenlen+1,TermID);
TermID[0] = 'e';
term->len = tokenlen;
term->str = (const gchar*)(term->buffer = TermID);
gcp_cmd_add_term(msg, trx, cmd, term, wild_term, pinfo, keep_persistent_data);
/*** TERM ***/
proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb,
tvb_offset, tokenlen, TermID);
break;
case '*':
wild_term = GCP_WILDCARD_ALL;
term->len = 1;
term->buffer = (const guint8*)(term->str = "*");
gcp_cmd_add_term(msg, trx, cmd, term, wild_term, pinfo, keep_persistent_data);
proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb,
tvb_offset, tokenlen,
"WildCard all");
col_append_str(pinfo->cinfo, COL_INFO, "=*");
break;
case '$':
wild_term = GCP_WILDCARD_CHOOSE;
term->len = 1;
term->buffer = (term->str = "$");
gcp_cmd_add_term(msg, trx, cmd, term, wild_term, pinfo, keep_persistent_data);
proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb,
tvb_offset, tokenlen,
"WildCard any");
col_append_str(pinfo->cinfo, COL_INFO, "=$");
break;
case 'O':
break;
default:
/*** TERM ***/
switch (megaco_command) {
case MEGACO_CMD_PRIORITY:
proto_tree_add_string(megaco_tree_command_line, hf_megaco_priority, tvb,
tvb_offset, tokenlen,
tvb_format_text(pinfo->pool, tvb, tvb_offset,
tokenlen));
break;
default:
proto_tree_add_string(megaco_tree_command_line, hf_megaco_termid, tvb,
tvb_offset, tokenlen,
tvb_format_text(pinfo->pool, tvb, tvb_offset,
tokenlen));
term->len = tokenlen;
term->buffer = (const guint8*)(term->str = tvb_format_text(pinfo->pool, tvb, tvb_offset, tokenlen));
gcp_cmd_add_term(msg, trx, cmd, term, wild_term, pinfo, keep_persistent_data);
break;
}
col_append_fstr(pinfo->cinfo, COL_INFO, "=%s",tvb_format_text(pinfo->pool, tvb, tvb_offset,tokenlen));
break;
}
}
/* Dissect the Descriptors */
if ( LBRKT_counter != 0 && tvb_current_offset != tvb_command_end_offset){
tvb_descriptors_start_offset = tvb_find_guint8(tvb, tvb_command_start_offset,
tvb_transaction_end_offset, '{');
tvb_descriptors_end_offset = tvb_descriptors_start_offset;
if ( tvb_descriptors_end_offset > tvb_transaction_end_offset )
tvb_descriptors_end_offset = tvb_transaction_end_offset;
while ( LBRKT_counter > 0 ){
tvb_descriptors_end_offset = tvb_find_guint8(tvb, tvb_descriptors_end_offset+1,
tvb_transaction_end_offset, '}');
LBRKT_counter--;
}
tempchar = tvb_get_guint8(tvb, tvb_command_start_offset);
if ( tempchar == 'E'|| tempchar == 'e'){
dissect_megaco_descriptors(tvb, megaco_tree_command_line, pinfo, tvb_command_start_offset-1,tvb_descriptors_end_offset, tree, ctx_id);
}
else {
dissect_megaco_descriptors(tvb, megaco_tree_command_line, pinfo, tvb_descriptors_start_offset,tvb_descriptors_end_offset, tree, ctx_id);
}
}
RBRKT_counter = 0;
LBRKT_counter = 0;
tvb_command_start_offset = megaco_tvb_skip_wsp(tvb, tvb_command_end_offset +1);
tvb_LBRKT = tvb_command_start_offset;
tvb_RBRKT = tvb_command_start_offset;
}
} while ( tvb_command_end_offset < tvb_transaction_end_offset );
if (keep_persistent_data) {
gcp_msg_to_str(msg,pinfo->pool,keep_persistent_data);
gcp_analyze_msg(megaco_tree, pinfo, tvb, msg, &megaco_ctx_ids, &ei_megaco_errored_command);
}
tvb_next_offset = tvb_transaction_end_offset;
}
while( tvb_transaction_end_offset > 0 && tvb_transaction_end_offset < tvb_len - 2);
if(global_megaco_raw_text){
tvb_raw_text_add(tvb, megaco_tree);
}
return tvb_captured_length(tvb);
}
#define MEGACO_MODEM_TOKEN 1
#define MEGACO_MUX_TOKEN 2
#define MEGACO_MEDIA_TOKEN 3
#define MEGACO_SIGNALS_TOKEN 4
#define MEGACO_SERVICES_TOKEN 5
#define MEGACO_STATS_TOKEN 6
#define MEGACO_ERROR_TOKEN 7
#define MEGACO_EVENTS_TOKEN 8
#define MEGACO_AUDIT_TOKEN 9
#define MEGACO_DIGITMAP_TOKEN 10
#define MEGACO_OE_TOKEN 11
#define MEGACO_TOPOLOGY_TOKEN 12
#define MEGACO_PACKAGES_TOKEN 13
static const megaco_tokens_t megaco_descriptors_names[] = {
{ "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */
{ "Modem", "MD" }, /* 1 */
{ "Mux", "MX" }, /* 2 */
{ "Media", "M" }, /* 3 */
{ "Signals", "SG" }, /* 4 */
{ "Services", "SV" }, /* 5 */
{ "Statistics", "SA" }, /* 6 */
{ "Error", "ER" }, /* 7 */
{ "Events", "E" }, /* 8 */
{ "Audit", "AT" }, /* 9 */
{ "DigitMap", "DM" }, /* 10 */
{ "ObservedEvents", "OE" }, /* 11 */
{ "Topology", "TP" }, /* 12 */
{ "Packages", "PG" }, /* 13 */
};
/* Returns index of megaco_tokens_t */
/* note - also called by dissect_megaco_auditdescriptor */
static gint find_megaco_descriptors_names(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(megaco_descriptors_names); i++) {
if (header_len == strlen(megaco_descriptors_names[i].name) &&
tvb_strncaseeql(tvb, offset, megaco_descriptors_names[i].name, header_len) == 0)
return i;
if (megaco_descriptors_names[i].compact_name != NULL &&
header_len == strlen(megaco_descriptors_names[i].compact_name) &&
tvb_strncaseeql(tvb, offset, megaco_descriptors_names[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
static void
dissect_megaco_modemdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
proto_tree_add_string(megaco_tree_command_line, hf_megaco_modem_descriptor, tvb,
tvb_previous_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_previous_offset,
tokenlen));
}
static void
dissect_megaco_multiplexdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
proto_tree_add_string(megaco_tree_command_line, hf_megaco_multiplex_descriptor, tvb,
tvb_previous_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_previous_offset,
tokenlen));
}
/* mediaDescriptor = MediaToken LBRKT mediaParm *(COMMA mediaParm) RBRKT
* MediaToken = ("Media" / "M")
*
* mediaParm = (streamParm / streamDescriptor /terminationStateDescriptor)
*
* ; at-most one terminationStateDescriptor
* ; and either streamParm(s) or streamDescriptor(s) but not both
* streamParm = ( localDescriptor / remoteDescriptor /localControlDescriptor )
* localDescriptor = LocalToken LBRKT octetString RBRKT
* LocalToken = ("Local" / "L")
* octetString = *(nonEscapeChar)
* nonEscapeChar = ( "\}" / %x01-7C / %x7E-FF )
* remoteDescriptor = RemoteToken LBRKT octetString RBRKT
* RemoteToken = ("Remote" / "R")
* localControlDescriptor = LocalControlToken LBRKT localParm*(COMMA localParm) RBRKT
* LocalControlToken = ("LocalControl" / "O")
* localParm = ( streamMode / propertyParm / reservedValueMode
* streamDescriptor = StreamToken EQUAL StreamID LBRKT streamParm*(COMMA streamParm) RBRKT
* StreamToken = ("Stream" / "ST")
* terminationStateDescriptor = TerminationStateToken LBRKTterminationStateParm
* *( COMMA terminationStateParm ) RBRKT
* TerminationStateToken = ("TerminationState" / "TS")
* terminationStateParm =(propertyParm / serviceStates / eventBufferControl )
*/
#define MEGACO_LOCAL_TOKEN 1
#define MEGACO_REMOTE_TOKEN 2
#define MEGACO_LOCAL_CONTROL_TOKEN 3
#define MEGACO_STREAM_TOKEN 4
#define MEGACO_TERMINATION_STATE_DESC 5
static const megaco_tokens_t megaco_mediaParm_names[] = {
{ "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */
{ "Local", "L" }, /* 1 */
{ "Remote", "R" }, /* 2 */
{ "LocalControl", "O" }, /* 3 */
{ "Stream", "ST" }, /* 4 */
{ "TerminationState", "TS" }, /* 5 */
};
/* Returns index of megaco_tokens_t */
static gint find_megaco_mediaParm_names(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(megaco_mediaParm_names); i++) {
if (header_len == strlen(megaco_mediaParm_names[i].name) &&
tvb_strncaseeql(tvb, offset, megaco_mediaParm_names[i].name, header_len) == 0)
return i;
if (megaco_mediaParm_names[i].compact_name != NULL &&
header_len == strlen(megaco_mediaParm_names[i].compact_name) &&
tvb_strncaseeql(tvb, offset, megaco_mediaParm_names[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
static void
dissect_megaco_mediadescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line,packet_info *pinfo, gint tvb_last_RBRKT,
gint tvb_previous_offset, gint start_offset, proto_tree *top_tree, guint32 context)
{
gint tokenlen, tvb_LBRKT, tvb_RBRKT;
gint tvb_next_offset, tvb_current_offset, tvb_offset, equal_offset, save_offset;
gint mediaParm;
guint streamId;
proto_tree *megaco_mediadescriptor_tree;
proto_item *megaco_mediadescriptor_ti, *ti;
megaco_mediadescriptor_ti = proto_tree_add_item(megaco_tree_command_line, hf_megaco_media_descriptor, tvb, start_offset, 1, ENC_NA);
megaco_mediadescriptor_tree = proto_item_add_subtree(megaco_mediadescriptor_ti, ett_megaco_mediadescriptor);
while ( tvb_previous_offset < tvb_last_RBRKT){
/* Start of token */
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset);
/* Find token length */
for (tvb_next_offset=tvb_current_offset; tvb_next_offset < tvb_last_RBRKT; tvb_next_offset++){
if (!g_ascii_isalpha(tvb_get_guint8(tvb, tvb_next_offset ))){
break;
}
}
tokenlen = tvb_next_offset - tvb_current_offset;
mediaParm = find_megaco_mediaParm_names(tvb, tvb_current_offset, tokenlen);
tvb_LBRKT = tvb_find_guint8(tvb, tvb_next_offset , tvb_last_RBRKT, '{');
tvb_next_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_last_RBRKT, '}');
tvb_RBRKT = tvb_next_offset;
switch ( mediaParm ){
case MEGACO_LOCAL_TOKEN:
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
dissect_megaco_LocalRemotedescriptor(tvb, megaco_mediadescriptor_tree, pinfo,
tvb_RBRKT, tvb_current_offset, context, TRUE);
tvb_current_offset = tvb_RBRKT;
break;
case MEGACO_REMOTE_TOKEN:
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
dissect_megaco_LocalRemotedescriptor(tvb, megaco_mediadescriptor_tree, pinfo,
tvb_RBRKT, tvb_current_offset, context, FALSE);
tvb_current_offset = tvb_RBRKT;
break;
case MEGACO_LOCAL_CONTROL_TOKEN:
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
dissect_megaco_LocalControldescriptor(tvb, megaco_mediadescriptor_tree, pinfo,
tvb_RBRKT, tvb_current_offset, top_tree);
tvb_current_offset = tvb_RBRKT;
break;
case MEGACO_STREAM_TOKEN:
save_offset = tvb_current_offset;
equal_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_last_RBRKT, '=');
tvb_current_offset = megaco_tvb_skip_wsp(tvb, equal_offset+1);
tvb_offset = megaco_tvb_skip_wsp_return(tvb, tvb_LBRKT-1);
tokenlen = tvb_offset - tvb_current_offset;
streamId = (guint)strtoul(tvb_format_text(pinfo->pool, tvb, tvb_current_offset,tokenlen),NULL,10);
ti = proto_tree_add_uint(megaco_mediadescriptor_tree, hf_megaco_streamid, tvb,
save_offset, 1, streamId);
proto_item_set_len(ti, tvb_offset-save_offset+tokenlen);
tvb_previous_offset = tvb_LBRKT+1;
continue;
case MEGACO_TERMINATION_STATE_DESC:
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_LBRKT+1);
dissect_megaco_TerminationStatedescriptor(tvb, megaco_mediadescriptor_tree,
tvb_RBRKT, tvb_current_offset);
tvb_current_offset = tvb_RBRKT;
break;
default:
break;
};
/* more parameters ? */
tvb_next_offset = tvb_find_guint8(tvb, tvb_current_offset+1 , tvb_last_RBRKT, ',');
if (tvb_next_offset > tvb_last_RBRKT) tvb_next_offset = tvb_last_RBRKT;
if ( tvb_next_offset != -1 ){
/* (raw formatting removed)
tokenlen = tvb_next_offset - tvb_RBRKT+1;
proto_tree_add_format_text(megaco_mediadescriptor_tree, tvb, tvb_RBRKT, tokenlen); */
tvb_previous_offset = tvb_next_offset+1;
} else{
/* Add the trailing '}' (raw formatting removed) */
/* proto_tree_add_format_text(megaco_mediadescriptor_tree, tvb, tvb_RBRKT, 1); */
tvb_previous_offset = tvb_last_RBRKT;
}
} /* End while */
proto_item_set_end(megaco_mediadescriptor_ti, tvb, tvb_previous_offset);
}
static void
dissect_megaco_h245(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree, gint offset, gint len, proto_tree *top_tree)
{
/*proto_item *item;*/
/*proto_tree *tree;*/
gchar *msg = tvb_format_text(pinfo->pool, tvb, offset, len);
/*item= */proto_tree_add_item(megaco_tree, hf_megaco_h245, tvb, offset, len, ENC_NA);
/*tree = proto_item_add_subtree(item, ett_megaco_h245); */
/* arbitrary maximum length */
if(len<20480){
int i;
tvbuff_t *h245_tvb;
guint8 *buf = (guint8 *)wmem_alloc(pinfo->pool, 10240);
/* first, skip to where the encoded pdu starts, this is
the first hex digit after the '=' char.
*/
while(1){
if((*msg==0)||(*msg=='\n')){
return;
}
if(*msg=='='){
msg++;
break;
}
msg++;
}
while(1){
if((*msg==0)||(*msg=='\n')){
return;
}
if( ((*msg>='0')&&(*msg<='9'))
|| ((*msg>='a')&&(*msg<='f'))
|| ((*msg>='A')&&(*msg<='F'))){
break;
}
msg++;
}
i=0;
while( ((*msg>='0')&&(*msg<='9'))
||((*msg>='a')&&(*msg<='f'))
||((*msg>='A')&&(*msg<='F')) ){
int val;
if((*msg>='0')&&(*msg<='9')){
val=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val=(*msg)-'A'+10;
} else {
return;
}
val<<=4;
msg++;
if((*msg>='0')&&(*msg<='9')){
val|=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val|=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val|=(*msg)-'A'+10;
} else {
return;
}
msg++;
buf[i]=(guint8)val;
i++;
}
if(i==0){
return;
}
h245_tvb = tvb_new_child_real_data(tvb, buf,i,i);
add_new_data_source(pinfo, h245_tvb, "H.245 over MEGACO");
/* should go through a handle, however, the two h245 entry
points are different, one is over tpkt and the other is raw
*/
call_dissector(h245_handle, h245_tvb, pinfo, top_tree);
/* dissect_h245_MultimediaSystemControlMessage(h245_tvb, pinfo, tree);*/
}
}
static void
dissect_megaco_h324_h223caprn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree, gint offset _U_, gint len, gchar *msg)
{
asn1_ctx_t actx;
/* arbitrary maximum length */
if(len<20480){
int i;
tvbuff_t *h245_tvb;
guint8 *buf = (guint8 *)wmem_alloc(pinfo->pool, 10240);
/* first, skip to where the encoded pdu starts, this is
the first hex digit after the '=' char.
*/
while(1){
if((*msg==0)||(*msg=='\n')){
return;
}
if(*msg=='='){
msg++;
break;
}
msg++;
}
while(1){
if((*msg==0)||(*msg=='\n')){
return;
}
if( ((*msg>='0')&&(*msg<='9'))
|| ((*msg>='a')&&(*msg<='f'))
|| ((*msg>='A')&&(*msg<='F'))){
break;
}
msg++;
}
i=0;
while( ((*msg>='0')&&(*msg<='9'))
||((*msg>='a')&&(*msg<='f'))
||((*msg>='A')&&(*msg<='F')) ){
int val;
if((*msg>='0')&&(*msg<='9')){
val=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val=(*msg)-'A'+10;
} else {
return;
}
val<<=4;
msg++;
if((*msg>='0')&&(*msg<='9')){
val|=(*msg)-'0';
} else if((*msg>='a')&&(*msg<='f')){
val|=(*msg)-'a'+10;
} else if((*msg>='A')&&(*msg<='F')){
val|=(*msg)-'A'+10;
} else {
return;
}
msg++;
buf[i]=(guint8)val;
i++;
}
if(i==0){
return;
}
h245_tvb = tvb_new_child_real_data(tvb, buf,i,i);
add_new_data_source(pinfo, h245_tvb, "H.245 over MEGACO");
/* should go through a handle, however, the two h245 entry
points are different, one is over tpkt and the other is raw
*/
asn1_ctx_init(&actx, ASN1_ENC_PER, TRUE, pinfo);
dissect_h245_H223Capability(h245_tvb, 0, &actx, megaco_tree, hf_megaco_h223Capability);
}
}
static void
dissect_megaco_eventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset, proto_tree *top_tree)
{
gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset;
gint tvb_events_end_offset, tvb_LBRKT;
proto_tree *megaco_eventsdescriptor_tree, *megaco_requestedevent_tree;
proto_item *megaco_eventsdescriptor_ti, *megaco_requestedevent_ti, *ti;
gint requested_event_start_offset = 0,
requested_event_end_offset = 0;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
megaco_eventsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_events_descriptor,tvb,tvb_previous_offset, tokenlen, ENC_NA);
megaco_eventsdescriptor_tree = proto_item_add_subtree(megaco_eventsdescriptor_ti, ett_megaco_eventsdescriptor);
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '=');
tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{');
if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1);
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_next_offset-1);
tokenlen = tvb_help_offset - tvb_current_offset;
ti = proto_tree_add_uint(megaco_eventsdescriptor_tree, hf_megaco_requestid, tvb,
tvb_current_offset, 1,
(guint32) strtoul(tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen), NULL, 10));
proto_item_set_len(ti, tokenlen);
tvb_events_end_offset = tvb_RBRKT;
tvb_RBRKT = tvb_next_offset+1;
tvb_LBRKT = tvb_next_offset+1;
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_next_offset+1);
do {
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_events_end_offset, '}');
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT,
tvb_events_end_offset, '{');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset,
tvb_events_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_events_end_offset){
tvb_current_offset = tvb_events_end_offset;
}
/* Descriptor includes no parameters */
if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){
tvb_RBRKT = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1;
}
/* Descriptor includes Parameters */
if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){
while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_events_end_offset, '{');
if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1)
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_events_end_offset, '}');
}
}
tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_events_end_offset, '{');
/* if there are eventparameter */
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_event_start_offset = tvb_help_offset;
requested_event_end_offset = tvb_RBRKT;
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_help_offset-1);
tokenlen = tvb_help_offset - tvb_previous_offset;
}
/* no parameters */
else {
tokenlen = tvb_RBRKT+1 - tvb_previous_offset;
}
megaco_requestedevent_ti = proto_tree_add_item(megaco_eventsdescriptor_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,tokenlen, ENC_UTF_8|ENC_NA);
megaco_requestedevent_tree = proto_item_add_subtree(megaco_requestedevent_ti, ett_megaco_requestedevent);
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_event_start_offset = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1);
requested_event_end_offset = megaco_tvb_skip_wsp_return(tvb, requested_event_end_offset-1);
if (!tvb_strncaseeql(tvb, requested_event_start_offset, "dm", 2)) {
dissect_megaco_digitmapdescriptor(tvb, megaco_requestedevent_tree, requested_event_end_offset, requested_event_start_offset);
}
else{
tokenlen = requested_event_end_offset - requested_event_start_offset;
if(!tvb_strneql(tvb, requested_event_start_offset, "h245", 4)){
dissect_megaco_h245(tvb, pinfo, megaco_requestedevent_tree, requested_event_start_offset, tokenlen, top_tree);
} else {
proto_tree_add_format_text(megaco_requestedevent_tree, tvb, requested_event_start_offset, tokenlen);
}
}
}
tvb_previous_offset = tvb_current_offset;
tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT,
tvb_events_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_events_end_offset || tvb_current_offset < tvb_previous_offset ) {
tvb_current_offset = tvb_events_end_offset;
}
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
tvb_LBRKT = tvb_previous_offset;
tvb_RBRKT = tvb_previous_offset;
} while ( tvb_current_offset < tvb_events_end_offset );
}
}
static void
dissect_megaco_signaldescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset, proto_tree *top_tree)
{
gint tokenlen, pkg_tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset;
gint tvb_signals_end_offset, tvb_signals_start_offset, tvb_LBRKT;
proto_tree *megaco_signalsdescriptor_tree, *megaco_requestedsignal_tree;
proto_item *megaco_signalsdescriptor_ti, *megaco_requestedsignal_ti;
gint requested_signal_start_offset = 0,
requested_signal_end_offset = 0;
tvb_signals_end_offset = tvb_RBRKT;
tvb_signals_start_offset = tvb_previous_offset;
if(g_ascii_toupper(tvb_get_guint8(tvb, tvb_previous_offset+1))=='G')
tokenlen = 2; /* token is compact text (SG) */
else
tokenlen = 7; /* token must be verbose text (Signals) */
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset+tokenlen);
if(tvb_get_guint8(tvb, tvb_current_offset)!='{') { /* {} has been omitted */
megaco_signalsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line, hf_megaco_signal_descriptor, tvb, tvb_signals_start_offset, tokenlen, ENC_NA);
expert_add_info(pinfo, megaco_signalsdescriptor_ti, &ei_megaco_signal_descriptor);
col_append_str(pinfo->cinfo, COL_INFO, " (Signal:none)"); /* then say so */
return; /* and return */
}
tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_signals_end_offset, '{');
tokenlen = (tvb_LBRKT+1) - tvb_signals_start_offset;
megaco_signalsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_signal_descriptor,tvb,tvb_previous_offset,tokenlen, ENC_NA);
megaco_signalsdescriptor_tree = proto_item_add_subtree(megaco_signalsdescriptor_ti, ett_megaco_signalsdescriptor);
tvb_current_offset = tvb_LBRKT;
tvb_next_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
col_append_fstr(pinfo->cinfo, COL_INFO, " (Signal:%s)",tvb_format_text(pinfo->pool, tvb, tvb_current_offset,tokenlen-tvb_current_offset+tvb_previous_offset));
if ( tvb_current_offset < tvb_signals_end_offset && tvb_current_offset != -1 && tvb_next_offset != tvb_signals_end_offset){
tvb_RBRKT = tvb_next_offset+1;
tvb_LBRKT = tvb_next_offset+1;
tvb_previous_offset = tvb_next_offset;
do {
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_signals_end_offset, '}');
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT,
tvb_signals_end_offset, '{');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset,
tvb_signals_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_signals_end_offset){
tvb_current_offset = tvb_signals_end_offset;
}
/* Descriptor includes no parameters */
if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){
tvb_RBRKT = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1;
}
/* Descriptor includes Parameters */
if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){
while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_signals_end_offset, '{');
if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1)
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_signals_end_offset, '}');
}
}
tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_signals_end_offset, '{');
/* if there are signalparameter */
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_signal_start_offset = tvb_help_offset;
requested_signal_end_offset = tvb_RBRKT;
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_help_offset-1);
pkg_tokenlen = tvb_help_offset - tvb_previous_offset;
}
/* no parameters */
else {
pkg_tokenlen = tvb_RBRKT+1 - tvb_previous_offset;
}
megaco_requestedsignal_ti = proto_tree_add_item(megaco_signalsdescriptor_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,pkg_tokenlen, ENC_UTF_8|ENC_NA);
megaco_requestedsignal_tree = proto_item_add_subtree(megaco_requestedsignal_ti, ett_megaco_requestedsignal);
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_signal_start_offset = megaco_tvb_skip_wsp(tvb, requested_signal_start_offset +1);
requested_signal_end_offset = megaco_tvb_skip_wsp_return(tvb, requested_signal_end_offset-1);
tokenlen = requested_signal_end_offset - requested_signal_start_offset;
if(!tvb_strneql(tvb, requested_signal_start_offset, "h245", 4)){
dissect_megaco_h245(tvb, pinfo, megaco_requestedsignal_tree, requested_signal_start_offset, tokenlen, top_tree);
} else {
proto_tree_add_format_text( megaco_requestedsignal_tree, tvb, requested_signal_start_offset, tokenlen);
}
/* Print the trailing '}' (raw formatting removed) */
/* proto_tree_add_format_text( megaco_requestedsignal_tree, tvb, tvb_RBRKT, 1); */
}
tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT,
tvb_signals_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_signals_end_offset || tvb_current_offset < tvb_previous_offset){
tvb_current_offset = tvb_signals_end_offset;
}
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
tvb_LBRKT = tvb_previous_offset;
tvb_RBRKT = tvb_previous_offset;
/* Print the trailing '}' (raw formatting removed) */
/* proto_tree_add_format_text(megaco_tree_command_line, tvb, tvb_signals_end_offset, 1); */
} while ( tvb_current_offset < tvb_signals_end_offset );
}else{
/* signals{} (raw formatting removed)
proto_tree_add_format_text(megaco_tree_command_line, tvb, tvb_signals_end_offset, 1); */
}
}
/*
auditDescriptor = AuditToken LBRKT [ auditItem *(COMMA auditItem) ] RBRKT
auditItem = ( MuxToken / ModemToken / MediaToken /
SignalsToken / EventBufferToken /
DigitMapToken / StatsToken / EventsToken /
ObservedEventsToken / PackagesToken ) */
static void
dissect_megaco_auditdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree, packet_info *pinfo _U_, gint tvb_stop, gint tvb_offset)
{
gint tokenlen, tvb_end, tvb_next, token_index;
proto_tree *megaco_auditdescriptor_tree, *megaco_auditdescriptor_ti;
tvb_next = tvb_find_guint8(tvb, tvb_offset, tvb_stop, '{'); /* find opening LBRKT - is this already checked by caller?*/
if( tvb_next == -1 ) /* complain and give up if not there */
{
expert_add_info(pinfo, megaco_tree, &ei_megaco_audit_descriptor);
return;
}
tokenlen = (tvb_stop + 1) - tvb_offset;
megaco_auditdescriptor_ti = proto_tree_add_item( megaco_tree, hf_megaco_audit_descriptor, tvb, tvb_offset, tokenlen, ENC_NA);
megaco_auditdescriptor_tree = proto_item_add_subtree( megaco_auditdescriptor_ti, ett_megaco_auditdescriptor );
tvb_offset = tvb_next;
while( tvb_offset < tvb_stop )
{
tvb_offset = megaco_tvb_skip_wsp(tvb, tvb_offset+1); /* find start of an auditItem */
if( tvb_get_guint8(tvb, tvb_offset) != '}' ) /* got something */
{
tvb_next = tvb_find_guint8(tvb, tvb_offset, tvb_stop, ','); /* end of an auditItem */
if (tvb_next == -1) /* last item doesn't have a comma */
tvb_next = tvb_stop;
tvb_end = megaco_tvb_skip_wsp_return(tvb, tvb_next-1); /* trim any trailing whitespace */
tokenlen = tvb_end - tvb_offset; /* get length of token */
token_index = find_megaco_descriptors_names(tvb, tvb_offset, tokenlen); /* lookup the token */
if( token_index == -1 ) /* if not found then 0 => Unknown */
token_index = 0;
proto_tree_add_string(megaco_auditdescriptor_tree, hf_megaco_audititem, tvb,
tvb_offset, tokenlen, megaco_descriptors_names[token_index].name); /* and display the long form */
tvb_offset = tvb_next; /* advance pointer */
}
}
}
/*
* serviceChangeDescriptor = ServicesToken LBRKT serviceChangeParm
* *(COMMA serviceChangeParm) RBRKT
*
* ServicesToken = ("Services" / "SV")
*
* serviceChangeParm = (serviceChangeMethod / serviceChangeReason /
* serviceChangeDelay / serviceChangeAddress /
* serviceChangeProfile / extension / TimeStamp /
* serviceChangeMgcId / serviceChangeVersion )
*
*/
#define MEGACO_REASON_TOKEN 1
#define MEGACO_DELAY_TOKEN 2
#define MEGACO_SC_ADDR_TOKEN 3
#define MEGACO_MGC_ID_TOKEN 4
#define MEGACO_PROFILE_TOKEN 5
#define MEGACO_VERSION_TOKEN 6
#define MEGACO_METHOD_TOKEN 7
static const megaco_tokens_t megaco_serviceChangeParm_names[] = {
{ "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */
/* streamMode */
{ "Reason", "RE" }, /* 1 ReasonToken*/
{ "Delay", "DL" }, /* 2 DelayToken */
{ "ServiceChangeAddress", "AD" }, /* 3 ServiceChangeAddressToken */
{ "MgcIdToTry", "MG" }, /* 4 MgcIdToken */
{ "Profile", "PF" }, /* 5 ProfileToken */
{ "Version", "V" }, /* 6 VersionToken */
{ "Method", "MT" }, /* 7 MethodToken */
};
/* Returns index of megaco_tokens_t */
static gint find_megaco_megaco_serviceChangeParm_names(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(megaco_serviceChangeParm_names); i++) {
if (header_len == strlen(megaco_serviceChangeParm_names[i].name) &&
tvb_strncaseeql(tvb, offset, megaco_serviceChangeParm_names[i].name, header_len) == 0)
return i;
if (megaco_serviceChangeParm_names[i].compact_name != NULL &&
header_len == strlen(megaco_serviceChangeParm_names[i].compact_name) &&
tvb_strncaseeql(tvb, offset, megaco_serviceChangeParm_names[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
/*
* ServiceChangeReasons References
* -------------------- ----------
*/
static const value_string MEGACO_ServiceChangeReasons_vals[] = {
{900, "Service Restored"},
{901, "Cold Boot"},
{902, "Warm Boot"},
{903, "MGC Directed Change"},
{904, "Termination malfunctioning"},
{905, "Termination taken out of service"},
{906, "Loss of lower layer connectivity (e.g. downstream sync)"},
{907, "Transmission Failure"},
{908, "MG Impending Failure"},
{909, "MGC Impending Failure"},
{910, "Media Capability Failure"},
{911, "Modem Capability Failure"},
{912, "Mux Capability Failure"},
{913, "Signal Capability Failure"},
{914, "Event Capability Failure"},
{915, "State Loss"},
{916, "Packages Change"},
{917, "Capabilities Change"},
{918, "Cancel Graceful"},
{919, "Warm Failover"},
{920, "Cold Failover"},
{ 0, NULL }
};
static void
dissect_megaco_servicechangedescriptor(tvbuff_t *tvb, packet_info* pinfo, proto_tree *megaco_tree, gint tvb_RBRKT,
gint tvb_previous_offset)
{
gint tokenlen, tvb_LBRKT, tvb_offset;
gint token_index;
gint tvb_current_offset;
gboolean more_params = TRUE;
proto_item* item;
gint reason;
gboolean reason_valid;
guint8 ServiceChangeReason_str[4];
tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{');
/*
if (tvb_LBRKT == -1)
return;
*/
tokenlen = (tvb_LBRKT + 1) - tvb_previous_offset;
proto_tree_add_format_text(megaco_tree, tvb, tvb_previous_offset, tokenlen);
/* Start dissecting serviceChangeParm */
tvb_previous_offset = tvb_LBRKT + 1;
while (more_params){
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_previous_offset);
/* Find token length */
for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_RBRKT; tvb_offset++){
if (!g_ascii_isalpha(tvb_get_guint8(tvb, tvb_offset ))){
break;
}
}
tokenlen = tvb_offset - tvb_previous_offset;
token_index = find_megaco_megaco_serviceChangeParm_names(tvb, tvb_previous_offset, tokenlen);
tvb_offset = tvb_find_guint8(tvb, tvb_offset, tvb_RBRKT, ',');
if ((tvb_offset == -1)||(tvb_offset >=tvb_RBRKT)){
more_params = FALSE;
tvb_offset = megaco_tvb_skip_wsp_return(tvb, tvb_RBRKT-1);
}
tokenlen = tvb_offset - tvb_previous_offset;
if (more_params == TRUE )
/* Include ',' */
tokenlen++;
switch(token_index){
case MEGACO_REASON_TOKEN:
/* ReasonToken EQUAL VALUE
* VALUE = quotedString / 1*(SafeChar)
*/
item = proto_tree_add_format_text(megaco_tree, tvb, tvb_previous_offset, tokenlen);
/* As the reason code ( if a digit ) can be in quoted string or 'just' digit
* look for a nine and hope for the best.
*/
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '9');
if ( tvb_current_offset == -1)
break;
tvb_get_nstringz0(tvb,tvb_current_offset,4,ServiceChangeReason_str);
reason_valid = ws_strtoi32(ServiceChangeReason_str, NULL, &reason);
proto_item_append_text(item,"[ %s ]", val_to_str(reason, MEGACO_ServiceChangeReasons_vals,"Unknown (%u)"));
if (!reason_valid)
expert_add_info(pinfo, item, &ei_megaco_reason_invalid);
break;
case MEGACO_DELAY_TOKEN:
case MEGACO_SC_ADDR_TOKEN:
case MEGACO_MGC_ID_TOKEN:
case MEGACO_PROFILE_TOKEN:
case MEGACO_VERSION_TOKEN:
case MEGACO_METHOD_TOKEN:
/* No special dissection: fall through */
default:
/* Unknown or:
* extension = extensionParameter parmValue
* extensionParameter = "X" ("-" / "+") 1*6(ALPHA / DIGIT)
*/
proto_tree_add_format_text(megaco_tree, tvb, tvb_previous_offset, tokenlen);
break;
}
tvb_previous_offset = tvb_offset +1;
}/*End while */
/* extension = extensionParameter parmValue
* extensionParameter = "X" ("-" / "+") 1*6(ALPHA / DIGIT)
*/
/*
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
proto_tree_add_string(megaco_tree_command_line, hf_megaco_servicechange_descriptor, tvb,
tvb_previous_offset, tokenlen,
tvb_format_text(pinfo->pool, tvb, tvb_previous_offset,
tokenlen));
*/
proto_tree_add_format_text(megaco_tree, tvb, tvb_RBRKT, 1);
}
static void
dissect_megaco_digitmapdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
tokenlen = tvb_RBRKT - tvb_previous_offset;
proto_tree_add_string(megaco_tree_command_line, hf_megaco_digitmap_descriptor, tvb,
tvb_previous_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_previous_offset,
tokenlen));
}
static void
dissect_megaco_statisticsdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
proto_tree *megaco_statisticsdescriptor_tree;
proto_item *megaco_statisticsdescriptor_ti;
gint tvb_help_offset, param_start_offset, param_end_offset = 0;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
megaco_statisticsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_statistics_descriptor,tvb,tvb_previous_offset,tokenlen, ENC_NA);
megaco_statisticsdescriptor_tree = proto_item_add_subtree(megaco_statisticsdescriptor_ti, ett_megaco_statisticsdescriptor);
tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset+1, tvb_RBRKT, '{');
do {
param_start_offset = megaco_tvb_skip_wsp(tvb, tvb_help_offset+1);
tvb_help_offset = tvb_find_guint8(tvb, tvb_help_offset+1, tvb_RBRKT, ',');
if ( tvb_help_offset > tvb_RBRKT || tvb_help_offset == -1){
tvb_help_offset = tvb_RBRKT;
param_end_offset = megaco_tvb_skip_wsp_return(tvb, tvb_RBRKT-1);
tokenlen = param_end_offset - param_start_offset;
} else {
param_end_offset = megaco_tvb_skip_wsp(tvb, tvb_help_offset-1);
tokenlen = param_end_offset - param_start_offset+1;
}
proto_tree_add_format_text(megaco_statisticsdescriptor_tree, tvb,param_start_offset, tokenlen);
} while ( tvb_help_offset < tvb_RBRKT );
}
static void
dissect_megaco_observedeventsdescriptor(tvbuff_t *tvb, packet_info *pinfo, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset, proto_tree *top_tree)
{
gint tokenlen, pkg_tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset;
gint tvb_observedevents_end_offset, tvb_LBRKT;
proto_tree *megaco_observedeventsdescriptor_tree, *megaco_observedevent_tree;
proto_item *megaco_observedeventsdescriptor_ti, *megaco_observedevent_ti, *ti;
gint requested_event_start_offset, requested_event_end_offset, param_start_offset, param_end_offset;
requested_event_start_offset = 0;
requested_event_end_offset = 0;
tvb_LBRKT = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{');
tvb_next_offset = tvb_LBRKT;
tokenlen = (tvb_next_offset+1) - tvb_previous_offset;
megaco_observedeventsdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_observedevents_descriptor,tvb,tvb_previous_offset,tokenlen, ENC_NA);
megaco_observedeventsdescriptor_tree = proto_item_add_subtree(megaco_observedeventsdescriptor_ti, ett_megaco_observedeventsdescriptor);
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '=');
tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{');
if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1);
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_next_offset-1);
tokenlen = tvb_help_offset - tvb_current_offset;
ti = proto_tree_add_uint(megaco_observedeventsdescriptor_tree, hf_megaco_requestid, tvb,
tvb_current_offset, 1,
(guint32) strtoul(tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen), NULL, 10));
proto_item_set_len(ti, tokenlen);
tvb_observedevents_end_offset = tvb_RBRKT;
tvb_RBRKT = tvb_next_offset+1;
tvb_LBRKT = tvb_next_offset+1;
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_next_offset+1);
do {
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_observedevents_end_offset, '}');
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT,
tvb_observedevents_end_offset, '{');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset,
tvb_observedevents_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_observedevents_end_offset){
tvb_current_offset = tvb_observedevents_end_offset;
}
/* Descriptor includes no parameters */
if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){
tvb_RBRKT = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1;
}
/* Descriptor includes Parameters */
if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){
while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_observedevents_end_offset, '{');
if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1){
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_observedevents_end_offset, '}');
}
}
}
tvb_LBRKT = tvb_help_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_observedevents_end_offset, '{');
/* if there are eventparameter */
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_event_start_offset = tvb_help_offset;
requested_event_end_offset = tvb_RBRKT;
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_help_offset-1);
pkg_tokenlen = tvb_help_offset - tvb_previous_offset;
tokenlen = tvb_LBRKT+1 - tvb_previous_offset;
}
/* no parameters */
else {
tokenlen = pkg_tokenlen = tvb_RBRKT+1 - tvb_previous_offset;
}
megaco_observedevent_ti = proto_tree_add_format_text(megaco_tree_command_line, tvb, tvb_previous_offset, tokenlen);
megaco_observedevent_tree = proto_item_add_subtree(megaco_observedevent_ti, ett_megaco_observedevent);
proto_tree_add_item(megaco_observedevent_tree,hf_megaco_pkgdname,tvb,tvb_previous_offset,pkg_tokenlen, ENC_UTF_8|ENC_NA);
if ( tvb_help_offset < tvb_RBRKT && tvb_help_offset != -1 ){
requested_event_start_offset = megaco_tvb_skip_wsp(tvb, requested_event_start_offset +1)-1;
requested_event_end_offset = megaco_tvb_skip_wsp_return(tvb, requested_event_end_offset-1);
tvb_help_offset = requested_event_start_offset;
do {
param_start_offset = megaco_tvb_skip_wsp(tvb, tvb_help_offset+1);
tvb_help_offset = tvb_find_guint8(tvb, tvb_help_offset+1,requested_event_end_offset, ',');
if ( tvb_help_offset > requested_event_end_offset || tvb_help_offset == -1){
tvb_help_offset = requested_event_end_offset;
}
param_end_offset = megaco_tvb_skip_wsp(tvb, tvb_help_offset-1);
tokenlen = param_end_offset - param_start_offset+1;
if(!tvb_strneql(tvb, param_start_offset, "h245", 4)){
dissect_megaco_h245(tvb, pinfo, megaco_tree_command_line, param_start_offset, tokenlen, top_tree);
} else {
proto_tree_add_format_text(megaco_tree_command_line, tvb, param_start_offset, tokenlen);
}
} while ( tvb_help_offset < requested_event_end_offset );
}
tvb_previous_offset = tvb_current_offset;
tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT,
tvb_observedevents_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_observedevents_end_offset ){
tvb_current_offset = tvb_observedevents_end_offset;
}
if (tvb_current_offset < tvb_previous_offset) {
expert_add_info_format(pinfo, megaco_observedevent_ti, &ei_megaco_parse_error, "Parse error: Invalid offset");
return;
}
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
tvb_LBRKT = tvb_previous_offset;
tvb_RBRKT = tvb_previous_offset;
/* Print the trailing '}' (raw formatting removed) */
/* proto_tree_add_format_text(megaco_tree_command_line, tvb, tvb_observedevents_end_offset, 1); */
} while ( tvb_current_offset < tvb_observedevents_end_offset );
}
}
static void
dissect_megaco_topologydescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
proto_tree_add_string(megaco_tree_command_line, hf_megaco_topology_descriptor, tvb,
tvb_previous_offset, tokenlen,
tvb_format_text_wsp(wmem_packet_scope(), tvb, tvb_previous_offset,
tokenlen));
}
static void
dissect_megaco_Packagesdescriptor(tvbuff_t *tvb, proto_tree *megaco_tree_command_line, gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen, tvb_current_offset, tvb_next_offset, tvb_help_offset;
gint tvb_packages_end_offset, tvb_LBRKT;
proto_tree *megaco_packagesdescriptor_tree;
proto_item *megaco_packagesdescriptor_ti, *ti;
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
megaco_packagesdescriptor_ti = proto_tree_add_item(megaco_tree_command_line,hf_megaco_packages_descriptor,tvb,tvb_previous_offset,tokenlen, ENC_UTF_8|ENC_NA);
megaco_packagesdescriptor_tree = proto_item_add_subtree(megaco_packagesdescriptor_ti, ett_megaco_packagesdescriptor);
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '=');
tvb_next_offset = tvb_find_guint8(tvb, tvb_previous_offset, tvb_RBRKT, '{');
if ( tvb_current_offset < tvb_RBRKT && tvb_current_offset != -1 ){
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1);
tvb_help_offset = megaco_tvb_skip_wsp_return(tvb, tvb_next_offset-1);
tokenlen = tvb_help_offset - tvb_current_offset;
ti = proto_tree_add_uint(megaco_packagesdescriptor_tree, hf_megaco_requestid, tvb,
tvb_current_offset, 1,
(guint32) strtoul(tvb_format_text(wmem_packet_scope(), tvb, tvb_current_offset, tokenlen), NULL, 10));
proto_item_set_len(ti, tokenlen);
tvb_packages_end_offset = tvb_RBRKT;
tvb_RBRKT = tvb_next_offset+1;
tvb_LBRKT = tvb_next_offset+1;
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_next_offset+1);
do {
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_packages_end_offset, '}');
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT,
tvb_packages_end_offset, '{');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset,
tvb_packages_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_packages_end_offset){
tvb_current_offset = tvb_packages_end_offset;
}
/* Descriptor includes no parameters */
if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){
tvb_RBRKT = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1;
}
/* Descriptor includes Parameters */
if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){
while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_packages_end_offset, '{');
if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1)
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_packages_end_offset, '}');
}
}
tokenlen = tvb_RBRKT+1 - tvb_previous_offset;
proto_tree_add_format_text(megaco_packagesdescriptor_tree, tvb, tvb_previous_offset, tokenlen);
tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT,
tvb_packages_end_offset, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_packages_end_offset ){
tvb_current_offset = tvb_packages_end_offset;
}
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
tvb_LBRKT = tvb_previous_offset;
tvb_RBRKT = tvb_previous_offset;
} while ( tvb_current_offset < tvb_packages_end_offset );
}
}
/* The list of error code values is fetched from http://www.iana.org/assignments/megaco-h248 */
/* 2003-08-28 */
static const value_string MEGACO_error_code_vals[] = {
{400, "Syntax error in message"},
{401, "Protocol Error"},
{402, "Unauthorized"},
{403, "Syntax error in transaction request"},
{406, "Version Not Supported"},
{410, "Incorrect identifier"},
{411, "The transaction refers to an unknown ContextId"},
{412, "No ContextIDs available"},
{421, "Unknown action or illegal combination of actions"},
{422, "Syntax Error in Action"},
{430, "Unknown TerminationID"},
{431, "No TerminationID matched a wildcard"},
{432, "Out of TerminationIDs or No TerminationID available"},
{433, "TerminationID is already in a Context"},
{434, "Max number of Terminations in a Context exceeded"},
{435, "Termination ID is not in specified Context"},
{440, "Unsupported or unknown Package"},
{441, "Missing Remote or Local Descriptor"},
{442, "Syntax Error in Command"},
{443, "Unsupported or Unknown Command"},
{444, "Unsupported or Unknown Descriptor"},
{445, "Unsupported or Unknown Property"},
{446, "Unsupported or Unknown Parameter"},
{447, "Descriptor not legal in this command"},
{448, "Descriptor appears twice in a command"},
{450, "No such property in this package"},
{451, "No such event in this package"},
{452, "No such signal in this package"},
{453, "No such statistic in this package"},
{454, "No such parameter value in this package"},
{455, "Property illegal in this Descriptor"},
{456, "Property appears twice in this Descriptor"},
{457, "Missing parameter in signal or event"},
{458, "Unexpected Event/Request ID"},
{459, "Unsupported or Unknown Profile"},
{471, "Implied Add for Multiplex failure"},
{500, "Internal software Failure in MG"},
{501, "Not Implemented"},
{502, "Not ready."},
{503, "Service Unavailable"},
{504, "Command Received from unauthorized entity"},
{505, "Transaction Request Received before a Service Change Reply has been received"},
{506, "Number of Transaction Pendings Exceeded"},
{510, "Insufficient resources"},
{512, "Media Gateway unequipped to detect requested Event"},
{513, "Media Gateway unequipped to generate requested Signals"},
{514, "Media Gateway cannot send the specified announcement"},
{515, "Unsupported Media Type"},
{517, "Unsupported or invalid mode"},
{518, "Event buffer full"},
{519, "Out of space to store digit map"},
{520, "Digit Map undefined in the MG"},
{521, "Termination is ServiceChanging"},
{526, "Insufficient bandwidth"},
{529, "Internal hardware failure in MG"},
{530, "Temporary Network failure"},
{531, "Permanent Network failure"},
{532, "Audited Property, Statistic, Event or Signal does not exist"},
{533, "Response exceeds maximum transport PDU size"},
{534, "Illegal write or read only property"},
{540, "Unexpected initial hook state"},
{581, "Does Not Exist"},
{600, "Illegal syntax within an announcement specification"},
{601, "Variable type not supported"},
{602, "Variable value out of range"},
{603, "Category not supported"},
{604, "Selector type not supported"},
{605, "Selector value not supported"},
{606, "Unknown segment ID"},
{607, "Mismatch between play specification and provisioned data"},
{608, "Provisioning error"},
{609, "Invalid offset"},
{610, "No free segment IDs"},
{611, "Temporary segment not found"},
{612, "Segment in use"},
{613, "ISP port limit overrun"},
{614, "No modems available"},
{615, "Calling number unacceptable"},
{616, "Called number unacceptable"},
{ 0, NULL }
};
static void
dissect_megaco_errordescriptor(tvbuff_t *tvb, packet_info* pinfo, proto_tree *megaco_tree_command_line,
gint tvb_RBRKT, gint tvb_previous_offset)
{
gint tokenlen;
gint error_code;
guint8 error[4];
gint tvb_current_offset;
proto_item* item;
proto_tree* error_tree;
gboolean error_code_valid;
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset , tvb_RBRKT, '=');
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset +1);
tokenlen = (tvb_RBRKT) - tvb_previous_offset+1;
item = proto_tree_add_item(megaco_tree_command_line, hf_megaco_error_descriptor, tvb,
tvb_previous_offset, tokenlen, ENC_NA);
error_tree = proto_item_add_subtree(item, ett_megaco_error_descriptor);
/* Get the error code */
tvb_get_nstringz0(tvb,tvb_current_offset,4,error);
error_code_valid = ws_strtoi32(error, NULL, &error_code);
item = proto_tree_add_uint(error_tree, hf_megaco_error_code, tvb, tvb_current_offset, 3, error_code);
if (!error_code_valid)
expert_add_info(pinfo, item, &ei_megaco_error_code_invalid);
/* Get the error string (even though we have a value_string that should match) */
tvb_previous_offset = tvb_find_guint8(tvb, tvb_current_offset, tvb_RBRKT, '\"');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset+1, tvb_RBRKT, '\"');
tokenlen = tvb_current_offset - tvb_previous_offset-1;
proto_tree_add_item(error_tree, hf_megaco_error_string, tvb, tvb_previous_offset+1, tokenlen, ENC_UTF_8|ENC_NA);
}
static void
dissect_megaco_TerminationStatedescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, gint tvb_next_offset, gint tvb_current_offset)
{
gint tokenlen;
gint tvb_offset;
guint8 tempchar;
proto_tree *megaco_TerminationState_tree, *megaco_TerminationState_ti;
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '=');
tokenlen = tvb_next_offset - tvb_current_offset;
megaco_TerminationState_ti = proto_tree_add_item(megaco_mediadescriptor_tree,hf_megaco_TerminationState_descriptor,tvb,tvb_current_offset,tokenlen, ENC_NA);
megaco_TerminationState_tree = proto_item_add_subtree(megaco_TerminationState_ti, ett_megaco_TerminationState);
while ( tvb_offset < tvb_next_offset && tvb_offset != -1 ){
tempchar = tvb_get_guint8(tvb, tvb_current_offset);
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
if ( (tempchar >= 'a')&& (tempchar <= 'z'))
tempchar = tempchar - 0x20;
switch ( tempchar ){
case 'S':
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ',');
if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){
tvb_offset = tvb_next_offset;
}
tokenlen = tvb_offset - tvb_current_offset;
proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Service_State, tvb,
tvb_current_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_current_offset,
tokenlen));
break;
case 'B':
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ',');
if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){
tvb_offset = tvb_next_offset;
}
tokenlen = tvb_offset - tvb_current_offset;
proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Event_Buffer_Control, tvb,
tvb_current_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_current_offset,
tokenlen));
break;
case 'E':
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ',');
if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){
tvb_offset = tvb_next_offset;
}
tokenlen = tvb_offset - tvb_current_offset;
proto_tree_add_string(megaco_TerminationState_tree, hf_megaco_Event_Buffer_Control, tvb,
tvb_current_offset, tokenlen,
tvb_format_text(wmem_packet_scope(), tvb, tvb_current_offset,
tokenlen));
break;
default:
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ',');
if ( tvb_offset == -1 || tvb_offset > tvb_next_offset ){
tvb_offset = tvb_next_offset;
}
tokenlen = tvb_offset - tvb_current_offset;
proto_tree_add_format_text(megaco_TerminationState_tree, tvb, tvb_current_offset, tokenlen);
break;
}
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_next_offset, '=');
}
/* (raw formatting removed)
proto_tree_add_format_text(megaco_mediadescriptor_tree, tvb, tvb_next_offset, 1); */
}
static void
dissect_megaco_LocalRemotedescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, packet_info *pinfo,
gint tvb_next_offset, gint tvb_current_offset, guint32 context, gboolean is_local)
{
gint tokenlen;
tvbuff_t *next_tvb;
http_message_info_t message_info = { SIP_DATA, NULL, NULL, NULL };
sdp_setup_info_t setup_info;
/* Only fill in the info when we have valid contex */
if ((context != 0) && (context < 0xfffffffe)) {
setup_info.hf_id = hf_megaco_Context;
setup_info.hf_type = SDP_TRACE_ID_HF_TYPE_GUINT32;
if (!sip_hide_generated_call_ids) {
setup_info.add_hidden = FALSE;
} else {
setup_info.add_hidden = prefs_get_bool_value(sip_hide_generated_call_ids, pref_current);
}
setup_info.trace_id.num = context;
message_info.data = &setup_info;
}
proto_tree *megaco_localdescriptor_tree;
proto_item *megaco_localdescriptor_item;
tokenlen = tvb_next_offset - tvb_current_offset;
if (is_local) {
megaco_localdescriptor_item = proto_tree_add_item(megaco_mediadescriptor_tree, hf_megaco_Local_descriptor, tvb, tvb_current_offset, tokenlen, ENC_NA);
megaco_localdescriptor_tree = proto_item_add_subtree(megaco_localdescriptor_item, ett_megaco_Localdescriptor);
} else {
megaco_localdescriptor_item = proto_tree_add_item(megaco_mediadescriptor_tree, hf_megaco_Remote_descriptor, tvb, tvb_current_offset, tokenlen, ENC_NA);
megaco_localdescriptor_tree = proto_item_add_subtree(megaco_localdescriptor_item, ett_megaco_Remotedescriptor);
}
if ( tokenlen > 3 ){
next_tvb = tvb_new_subset_length(tvb, tvb_current_offset, tokenlen);
call_dissector_with_data(sdp_handle, next_tvb, pinfo, megaco_localdescriptor_tree, &message_info);
}
}
/*
* localControlDescriptor = LocalControlToken LBRKT localParm
* *(COMMA localParm) RBRKT
* ; at-most-once per item
* localParm = ( streamMode / propertyParm / reservedValueMode / reservedGroupMode )
*/
#define MEGACO_MODETOKEN 1
#define MEGACO_RESERVEDVALUETOKEN 2
#define MEGACO_RESERVEDGROUPTOKEN 3
#define MEGACO_H324_H223CAPR 4
#define MEGACO_H324_MUXTBL_IN 5
#define MEGACO_H324_MUXTBL_OUT 6
#define MEGACO_DS_DSCP 7
#define MEGACO_GM_SAF 8
#define MEGACO_GM_SAM 9
#define MEGACO_GM_SPF 10
#define MEGACO_GM_SPR 11
#define MEGACO_GM_ESAS 12
#define MEGACO_GM_LSA 13
#define MEGACO_GM_ESPS 14
#define MEGACO_GM_LSP 15
#define MEGACO_GM_RSB 16
#define MEGACO_TMAN_POL 17
#define MEGACO_TMAN_SDR 18
#define MEGACO_TMAN_MBS 19
#define MEGACO_TMAN_PDR 20
#define MEGACO_TMAN_DVT 21
#define MEGACO_IPDC_REALM 22
static const megaco_tokens_t megaco_localParam_names[] = {
{ "Unknown-token", NULL }, /* 0 Pad so that the real headers start at index 1 */
/* streamMode */
{ "Mode", "MO" }, /* 1 */
{ "ReservedValue", "RV" }, /* 2 */
{ "ReservedGroup", "RG" }, /* 3 */
/* propertyParm = pkgdName parmValue
* Add more package names as needed.
*/
{ "h324/h223capr", NULL }, /* 4 */
{ "h324/muxtbl_in", NULL }, /* 5 */
{ "h324/muxtbl_out", NULL }, /* 6 */
{ "ds/dscp", NULL }, /* 7 */
{ "gm/saf", NULL }, /* 8 */
{ "gm/sam", NULL }, /* 9 */
{ "gm/spf", NULL }, /* 10 */
{ "gm/spr", NULL }, /* 11 */
{ "gm/esas", NULL }, /* 12 */
{ "gm/lsa", NULL }, /* 13 */
{ "gm/esps", NULL }, /* 14 */
{ "gm/lsp", NULL }, /* 15 */
{ "gm/rsb", NULL }, /* 16 */
{ "tman/pol", NULL }, /* 17 */
{ "tman/sdr", NULL }, /* 18 */
{ "tman/mbs", NULL }, /* 19 */
{ "tman/pdr", NULL }, /* 20 */
{ "tman/dvt", NULL }, /* 21 */
{ "ipdc/realm", NULL }, /* 22 */
};
/* Returns index of megaco_tokens_t */
static gint find_megaco_localParam_names(tvbuff_t *tvb, int offset, guint header_len)
{
guint i;
for (i = 1; i < array_length(megaco_localParam_names); i++) {
if (header_len == strlen(megaco_localParam_names[i].name) &&
tvb_strncaseeql(tvb, offset, megaco_localParam_names[i].name, header_len) == 0)
return i;
if (megaco_localParam_names[i].compact_name != NULL &&
header_len == strlen(megaco_localParam_names[i].compact_name) &&
tvb_strncaseeql(tvb, offset, megaco_localParam_names[i].compact_name, header_len) == 0)
return i;
}
return -1;
}
static void
dissect_megaco_LocalControldescriptor(tvbuff_t *tvb, proto_tree *megaco_mediadescriptor_tree, packet_info *pinfo, gint tvb_next_offset, gint tvb_current_offset, proto_tree *top_tree)
{
gint tokenlen;
guint token_name_len;
gint tvb_offset = 0,tvb_help_offset;
gint token_index = 0;
gchar *msg;
proto_item* item;
guint8 code_str[3];
proto_tree *megaco_LocalControl_tree;
proto_item *megaco_LocalControl_item;
tokenlen = tvb_next_offset - tvb_current_offset;
megaco_LocalControl_item = proto_tree_add_item(megaco_mediadescriptor_tree, hf_megaco_LocalControl_descriptor, tvb, tvb_current_offset, tokenlen, ENC_NA);
megaco_LocalControl_tree = proto_item_add_subtree(megaco_LocalControl_item, ett_megaco_LocalControldescriptor);
while ( tvb_offset < tvb_next_offset && tvb_offset != -1 ){
tvb_help_offset = tvb_current_offset;
/*
* Find local parameter name
* localParm = ( streamMode / propertyParm / reservedValueMode / reservedGroupMode )
* pkgdName = (PackageName SLASH ItemID) ;specific item
* / (PackageName SLASH "*") ;all events in package
* / ("*" SLASH "*") ; all events supported by the MG
*/
/* Find token length */
for (tvb_offset=tvb_current_offset; tvb_offset < tvb_next_offset; tvb_offset++){
guint8 octet;
octet = tvb_get_guint8(tvb, tvb_offset);
if (!g_ascii_isalnum(octet)){
if ((octet!='/')&&(octet!='_')){
break;
}
}
}
token_name_len = tvb_offset - tvb_current_offset;
/* Debug Code
proto_tree_add_format_text(megaco_LocalControl_tree, tvb, tvb_current_offset, token_name_len);
*/
token_index = find_megaco_localParam_names(tvb, tvb_current_offset, token_name_len);
/* Find start of parameter value */
tvb_offset = tvb_find_guint8(tvb, tvb_offset , tvb_next_offset, '=');
if (tvb_offset == -1) {
expert_add_info(pinfo, megaco_LocalControl_item, &ei_megaco_parse_error);
return;
}
/* Start search after '=' in case there is no SP*/
tvb_offset++;
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset);
/* find if there are more parameters or not */
tvb_offset = tvb_find_guint8(tvb, tvb_current_offset , tvb_offset, ',');
if ( tvb_offset < 0 || tvb_offset > tvb_next_offset ){
tvb_offset = tvb_next_offset;
}
tokenlen = megaco_tvb_skip_wsp_return(tvb,tvb_offset-1) - tvb_current_offset;
/* Debug Code
proto_tree_add_format_text(megaco_LocalControl_tree, tvb, tvb_current_offset, tokenlen);
*/
switch ( token_index ){
case MEGACO_MODETOKEN: /* Mode */
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_mode, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset,
tokenlen));
col_append_fstr(pinfo->cinfo, COL_INFO, " (Mode:%s)",tvb_format_text(pinfo->pool, tvb, tvb_current_offset,tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_RESERVEDVALUETOKEN: /* ReservedValue */
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_reserve_value, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_RESERVEDGROUPTOKEN: /* ReservedGroup */
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_reserve_group, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_H324_H223CAPR: /* h324/h223capr */
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_h324_h223capr, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
tokenlen = tvb_offset - tvb_help_offset;
msg=tvb_format_text(pinfo->pool, tvb,tvb_help_offset, tokenlen);
dissect_megaco_h324_h223caprn(tvb, pinfo, megaco_mediadescriptor_tree, tvb_help_offset, tokenlen, msg);
break;
case MEGACO_H324_MUXTBL_IN: /* h324/muxtbl_in */
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_h324_muxtbl_in, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
tokenlen = tvb_offset - tvb_help_offset;
/* Call the existing routine with tree = NULL to avoid an entry to the tree */
dissect_megaco_h245(tvb, pinfo, NULL, tvb_help_offset, tokenlen, top_tree);
break;
case MEGACO_H324_MUXTBL_OUT:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_h324_muxtbl_out, tvb,
tvb_current_offset, tokenlen,
tvb_format_text(pinfo->pool, tvb, tvb_current_offset,
tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
tokenlen = tvb_offset - tvb_help_offset;
/* Call the existing routine with tree = NULL to avoid an entry to the tree */
dissect_megaco_h245(tvb, pinfo, NULL, tvb_help_offset, tokenlen, top_tree);
break;
case MEGACO_DS_DSCP:
tvb_get_nstringz0(tvb,tvb_current_offset,3,code_str);
item = proto_tree_add_uint(megaco_LocalControl_tree, hf_megaco_ds_dscp, tvb,
tvb_help_offset, 1, (guint32) strtoul(code_str,NULL,16));
proto_item_set_len(item, tvb_offset-tvb_help_offset);
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_SAF:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_saf, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_SAM:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_sam, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_SPF:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_spf, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_SPR:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_spr, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_ESAS:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_esas, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_GM_RSB:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_gm_rsb, tvb,
tvb_help_offset, tvb_offset - tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset + 1);
break;
case MEGACO_TMAN_POL:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_tman_pol, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_TMAN_SDR:
{
gint32 sdr;
gboolean sdr_valid;
proto_item* pi;
sdr_valid = ws_strtoi32(tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen), NULL, &sdr);
pi =proto_tree_add_int(megaco_LocalControl_tree, hf_megaco_tman_sdr, tvb, tvb_help_offset,
tvb_offset - tvb_help_offset, sdr);
proto_item_append_text(pi, " [%i b/s]", sdr*8);
if (!sdr_valid) {
expert_add_info(pinfo, pi, &ei_megaco_invalid_sdr);
}
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset + 1);
}
break;
case MEGACO_TMAN_MBS:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_tman_mbs, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_TMAN_PDR:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_tman_pdr, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_TMAN_DVT:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_tman_dvt, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
case MEGACO_IPDC_REALM:
proto_tree_add_string(megaco_LocalControl_tree, hf_megaco_ipdc_realm, tvb,
tvb_help_offset, tvb_offset-tvb_help_offset, tvb_format_text(pinfo->pool, tvb, tvb_current_offset, tokenlen));
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
default:
tokenlen = tvb_offset - tvb_help_offset;
proto_tree_add_format_text(megaco_LocalControl_tree, tvb, tvb_help_offset, tokenlen);
tvb_current_offset = megaco_tvb_skip_wsp(tvb, tvb_offset +1);
break;
}
}
}
static void
dissect_megaco_descriptors(tvbuff_t *tvb, proto_tree *megaco_command_tree, packet_info *pinfo, gint tvb_descriptors_start_offset,
gint tvb_descriptors_end_offset, proto_tree *top_tree, guint32 context)
{
gint tvb_len, token_index, tvb_offset, temp_offset;
gint tvb_current_offset,tvb_previous_offset,save_offset,tokenlen;
gint tvb_RBRKT, tvb_LBRKT;
proto_tree* descriptor_tree;
proto_item* descriptor_item;
tvb_len = tvb_reported_length(tvb);
descriptor_tree = proto_tree_add_subtree(megaco_command_tree, tvb, tvb_descriptors_start_offset,
tvb_descriptors_end_offset-tvb_descriptors_start_offset, ett_megaco_descriptors, &descriptor_item, "Descriptors");
tvb_LBRKT = megaco_tvb_skip_wsp(tvb, tvb_descriptors_start_offset +1);
tvb_previous_offset = tvb_LBRKT;
tvb_RBRKT = tvb_descriptors_start_offset;
do {
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,
tvb_len, '}');
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT,
tvb_len, '{');
tvb_current_offset = tvb_find_guint8(tvb, tvb_previous_offset,
tvb_len, ',');
if (tvb_current_offset == -1 || tvb_current_offset > tvb_descriptors_end_offset){
tvb_current_offset = tvb_descriptors_end_offset;
}
if (tvb_current_offset <= tvb_previous_offset) {
expert_add_info_format(pinfo, descriptor_item, &ei_megaco_parse_error, "Parse error: Invalid offset");
return;
}
/* Descriptor includes no parameters */
if ( tvb_LBRKT > tvb_current_offset || tvb_LBRKT == -1 ){
if ( tvb_current_offset > tvb_RBRKT ){
tvb_current_offset = tvb_RBRKT;
}
tvb_RBRKT = megaco_tvb_skip_wsp_return(tvb, tvb_current_offset-1)-1;
}
/* Descriptor includes Parameters */
if ( (tvb_current_offset > tvb_LBRKT && tvb_LBRKT != -1)){
while ( tvb_LBRKT != -1 && tvb_RBRKT > tvb_LBRKT ){
tvb_LBRKT = tvb_find_guint8(tvb, tvb_LBRKT+1,
tvb_len, '{');
if ( tvb_LBRKT < tvb_RBRKT && tvb_LBRKT != -1)
tvb_RBRKT = tvb_find_guint8(tvb, tvb_RBRKT+1,tvb_len, '}');
}
}
/* Find token length */
for (tvb_offset=tvb_previous_offset; tvb_offset < tvb_descriptors_end_offset -1; tvb_offset++){
if (!g_ascii_isalpha(tvb_get_guint8(tvb, tvb_offset ))){
break;
}
}
tokenlen = tvb_offset - tvb_previous_offset;
token_index = find_megaco_descriptors_names(tvb, tvb_previous_offset, tokenlen);
if (tvb_RBRKT > tvb_descriptors_end_offset)
tvb_RBRKT = tvb_descriptors_end_offset;
switch ( token_index ){
case MEGACO_MODEM_TOKEN:
dissect_megaco_modemdescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_MUX_TOKEN:
dissect_megaco_multiplexdescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_MEDIA_TOKEN:
/*TODO: Move this to the top when all branches fixed !!!*/
temp_offset = tvb_find_guint8(tvb, tvb_previous_offset,tvb_descriptors_end_offset, '{');
save_offset = tvb_previous_offset;
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, temp_offset +1);
dissect_megaco_mediadescriptor(tvb, descriptor_tree, pinfo, tvb_RBRKT, tvb_previous_offset, save_offset, top_tree, context);
break;
case MEGACO_SIGNALS_TOKEN:
dissect_megaco_signaldescriptor(tvb, pinfo, descriptor_tree, tvb_RBRKT, tvb_previous_offset, top_tree);
break;
case MEGACO_SERVICES_TOKEN:
dissect_megaco_servicechangedescriptor(tvb, pinfo, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_STATS_TOKEN:
dissect_megaco_statisticsdescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_ERROR_TOKEN:
dissect_megaco_errordescriptor(tvb, pinfo, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_EVENTS_TOKEN:
dissect_megaco_eventsdescriptor(tvb, pinfo, descriptor_tree, tvb_RBRKT, tvb_previous_offset, top_tree);
break;
case MEGACO_AUDIT_TOKEN:
dissect_megaco_auditdescriptor(tvb, descriptor_tree, pinfo, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_DIGITMAP_TOKEN:
dissect_megaco_digitmapdescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_OE_TOKEN:
/* ObservedEventsToken */
dissect_megaco_observedeventsdescriptor(tvb, pinfo, descriptor_tree, tvb_RBRKT, tvb_previous_offset, top_tree);
break;
case MEGACO_TOPOLOGY_TOKEN:
dissect_megaco_topologydescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
case MEGACO_PACKAGES_TOKEN:
dissect_megaco_Packagesdescriptor(tvb, descriptor_tree, tvb_RBRKT, tvb_previous_offset);
break;
default:
tokenlen = (tvb_RBRKT+1) - tvb_previous_offset;
proto_tree_add_expert(descriptor_tree, pinfo, &ei_megaco_no_descriptor, tvb, tvb_previous_offset, tokenlen);
break;
}
tvb_current_offset = tvb_find_guint8(tvb, tvb_RBRKT, tvb_len, ',');
if (tvb_current_offset == -1 || tvb_descriptors_end_offset < tvb_current_offset){
tvb_current_offset = tvb_descriptors_end_offset;
}
tvb_previous_offset = megaco_tvb_skip_wsp(tvb, tvb_current_offset+1);
tvb_LBRKT = tvb_previous_offset;
tvb_RBRKT = tvb_previous_offset;
} while ( tvb_current_offset < tvb_descriptors_end_offset );
}
/* Copied from MGCP dissector, prints whole message in raw text */
static void tvb_raw_text_add(tvbuff_t *tvb, proto_tree *tree){
gint tvb_linebegin,tvb_lineend,linelen;
proto_tree* text_tree;
tvb_linebegin = 0;
if (tree) {
text_tree = proto_tree_add_subtree(tree, tvb, 0, -1, ett_megaco_raw_text, NULL, "-------------- (RAW text output) ---------------");
do {
linelen = tvb_find_line_end(tvb,tvb_linebegin,-1,&tvb_lineend,FALSE);
proto_tree_add_format_wsp_text(text_tree, tvb, tvb_linebegin, linelen);
tvb_linebegin = tvb_lineend;
} while (tvb_offset_exists(tvb, tvb_lineend) && linelen > 0);
}
}
/*
* megaco_tvb_skip_wsp - Returns the position in tvb of the first non-whitespace
* character following offset or offset + maxlength -1 whichever
* is smaller.
*
* Parameters:
* tvb - The tvbuff in which we are skipping whitespaces, tab and end_of_line characters.
* offset - The offset in tvb from which we begin trying to skip whitespace.
*
* Returns: The position in tvb of the first non-whitespace
*/
static gint megaco_tvb_skip_wsp(tvbuff_t* tvb, gint offset ){
gint counter = offset;
gint end = tvb_reported_length(tvb);
for(counter = offset; counter < end &&
(g_ascii_isspace(tvb_get_guint8(tvb,counter))); counter++);
return (counter);
}
static gint megaco_tvb_skip_wsp_return(tvbuff_t* tvb, gint offset){
gint counter = offset;
gint end = 0;
for(counter = offset; counter > end &&
(g_ascii_isspace(tvb_get_guint8(tvb,counter))); counter--);
counter++;
return (counter);
}
static gint megaco_tvb_find_token(tvbuff_t* tvb, gint offset, gint maxlength){
gint counter = 0;
gint pos = offset;
guchar needle;
do {
pos = tvb_ws_mempbrk_pattern_guint8(tvb, pos + 1, maxlength, &pbrk_braces, &needle);
if(pos == -1)
return -1;
switch(needle){
case '{':
counter++;
break;
case '}':
counter--;
break;
default:
break;
}
} while (counter>0);
if(counter<0)
return -1;
else
{
pos = megaco_tvb_skip_wsp(tvb,pos+1);
return pos;
}
}
static void
megaco_fmt_content( gchar *result, guint32 context )
{
switch(context)
{
case CHOOSE_CONTEXT:
case ALL_CONTEXTS:
case NULL_CONTEXT:
(void) g_strlcpy(result, val_to_str_const(context, megaco_context_vals, "Unknown"), ITEM_LABEL_LENGTH);
break;
default:
snprintf( result, ITEM_LABEL_LENGTH, "%d", context);
}
}
void
proto_register_megaco(void)
{
static hf_register_info hf[] = {
{ &hf_megaco_audititem,
{ "Audit Item", "megaco.audititem", FT_STRING, BASE_NONE, NULL, 0x0,
"Identity of item to be audited", HFILL }},
{ &hf_megaco_audit_descriptor,
{ "Audit Descriptor", "megaco.audit", FT_NONE, BASE_NONE, NULL, 0x0,
"Audit Descriptor of the megaco Command", HFILL }},
#if 0
{ &hf_megaco_command_line,
{ "Command line", "megaco.command_line", FT_STRING, BASE_NONE, NULL, 0x0,
"Commands of this message", HFILL }},
#endif
{ &hf_megaco_command,
{ "Command", "megaco.command", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_command_optional,
{ "Optional Command", "megaco.command_optional", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_wildcard_response,
{ "Wildcarded response to a command", "megaco.wildcard_response", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_Context,
{ "Context", "megaco.context", FT_UINT32, BASE_CUSTOM, CF_FUNC(megaco_fmt_content), 0x0,
"Context ID of this message", HFILL }},
{ &hf_megaco_digitmap_descriptor,
{ "DigitMap Descriptor", "megaco.digitmap", FT_STRING, BASE_NONE, NULL, 0x0,
"DigitMap Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_error_descriptor,
{ "ERROR Descriptor", "megaco.error", FT_NONE, BASE_NONE, NULL, 0x0,
"Error Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_error_code,
{ "ERROR Code", "megaco.error_code", FT_UINT32, BASE_DEC, VALS(MEGACO_error_code_vals), 0x0,
"Error Code of the megaco Command", HFILL }},
{ &hf_megaco_error_string,
{ "ERROR String", "megaco.error_string", FT_STRING, BASE_NONE, NULL, 0x0,
"Error String of the megaco Command", HFILL }},
{ &hf_megaco_Event_Buffer_Control,
{ "Event Buffer Control", "megaco.eventbuffercontrol", FT_STRING, BASE_NONE, NULL, 0x0,
"Event Buffer Control in Termination State Descriptor", HFILL }},
{ &hf_megaco_events_descriptor,
{ "Events Descriptor", "megaco.events", FT_NONE, BASE_NONE, NULL, 0x0,
"Events Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_Local_descriptor,
{ "Local Descriptor", "megaco.localdescriptor", FT_NONE, BASE_NONE, NULL, 0x0,
"Local Descriptor in Media Descriptor", HFILL }},
{ &hf_megaco_LocalControl_descriptor,
{ "Local Control Descriptor", "megaco.localcontroldescriptor", FT_NONE, BASE_NONE, NULL, 0x0,
"Local Control Descriptor in Media Descriptor", HFILL }},
{ &hf_megaco_media_descriptor,
{ "Media Descriptor", "megaco.media", FT_NONE, BASE_NONE, NULL, 0x0,
"Media Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_modem_descriptor,
{ "Modem Descriptor", "megaco.modem", FT_STRING, BASE_NONE, NULL, 0x0,
"Modem Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_mode,
{ "Mode", "megaco.mode", FT_STRING, BASE_NONE, NULL, 0x0,
"Mode sendonly/receiveonly/inactive/loopback", HFILL }},
{ &hf_megaco_multiplex_descriptor,
{ "Multiplex Descriptor", "megaco.multiplex", FT_STRING, BASE_NONE, NULL, 0x0,
"Multiplex Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_observedevents_descriptor,
{ "Observed Events Descriptor", "megaco.observedevents", FT_NONE, BASE_NONE, NULL, 0x0,
"Observed Events Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_packages_descriptor,
{ "Packages Descriptor", "megaco.packagesdescriptor", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_pkgdname,
{ "pkgdName", "megaco.pkgdname", FT_STRING, BASE_NONE, NULL, 0x0,
"PackageName SLASH ItemID", HFILL }},
{ &hf_megaco_Remote_descriptor,
{ "Remote Descriptor", "megaco.remotedescriptor", FT_NONE, BASE_NONE, NULL, 0x0,
"Remote Descriptor in Media Descriptor", HFILL }},
{ &hf_megaco_reserve_group,
{ "Reserve Group", "megaco.reservegroup", FT_STRING, BASE_NONE, NULL, 0x0,
"Reserve Group on or off", HFILL }},
{ &hf_megaco_h324_muxtbl_in,
{ "h324/muxtbl_in", "megaco.h324_muxtbl_in", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_h324_muxtbl_out,
{ "h324/muxtbl_out", "megaco.h324_muxtbl_out", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_ds_dscp,
{ "Differentiated Services Code Point", "megaco.ds_dscp", FT_UINT32, BASE_HEX|BASE_EXT_STRING, &dscp_vals_ext, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_saf,
{ "Remote Source Address Filtering", "megaco.gm_saf", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_sam,
{ "Remote Source Address Mask", "megaco.gm_sam", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_spf,
{ "Remote Source Port Filtering", "megaco.gm_spf", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_spr,
{ "Remote Source Port Range", "megaco.gm_spr", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_esas,
{ "Explicit Source Address Setting", "megaco.gm_esas", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_tman_pol,
{ "Policing", "megaco.tman_pol", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_gm_rsb,
{ "RTCP Allocation Specific Behaviour", "megaco.gm_rsb", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_tman_sdr,
{ "Sustainable Data Rate", "megaco.tman_sdr", FT_INT32, BASE_DEC|BASE_UNIT_STRING, &units_byte_bytespsecond, 0x0,
NULL, HFILL }},
{ &hf_megaco_tman_mbs,
{ "Maximum Burst Rate", "megaco.tman_mbs", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_tman_pdr,
{ "Peak Data Rate", "megaco.tman_pdr", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_tman_dvt,
{ "Delay Variation Tolerance", "megaco.tman_dvt", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_ipdc_realm,
{ "IP Realm Identifier", "megaco.ipdc_realm", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_h324_h223capr,
{ "h324/h223capr", "megaco.h324_h223capr", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_reserve_value,
{ "Reserve Value", "megaco.reservevalue", FT_STRING, BASE_NONE, NULL, 0x0,
"Reserve Value on or off", HFILL }},
{ &hf_megaco_requestid,
{ "RequestID", "megaco.requestid", FT_UINT32, BASE_DEC, NULL, 0x0,
"RequestID in Events or Observedevents Descriptor", HFILL }},
#if 0
{ &hf_megaco_servicechange_descriptor,
{ "Service Change Descriptor", "megaco.servicechange", FT_STRING, BASE_NONE, NULL, 0x0,
"Service Change Descriptor of the megaco Command", HFILL }},
#endif
{ &hf_megaco_Service_State,
{ "Service State", "megaco.servicestates", FT_STRING, BASE_NONE, NULL, 0x0,
"Service States in Termination State Descriptor", HFILL }},
{ &hf_megaco_signal_descriptor,
{ "Signal Descriptor", "megaco.signal", FT_NONE, BASE_NONE, NULL, 0x0,
"Signal Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_statistics_descriptor,
{ "Statistics Descriptor", "megaco.statistics", FT_NONE, BASE_NONE, NULL, 0x0,
"Statistics Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_streamid,
{ "StreamID", "megaco.streamid", FT_UINT32, BASE_DEC, NULL, 0x0,
"StreamID in the Media Descriptor", HFILL }},
{ &hf_megaco_termid,
{ "Termination ID", "megaco.termid", FT_STRING, BASE_NONE, NULL, 0x0,
"Termination ID of this Command", HFILL }},
{ &hf_megaco_TerminationState_descriptor,
{ "Termination State Descriptor", "megaco.terminationstate", FT_NONE, BASE_NONE, NULL, 0x0,
"Termination State Descriptor in Media Descriptor", HFILL }},
{ &hf_megaco_topology_descriptor,
{ "Topology Descriptor", "megaco.topology", FT_STRING, BASE_NONE, NULL, 0x0,
"Topology Descriptor of the megaco Command", HFILL }},
{ &hf_megaco_transaction,
{ "Transaction", "megaco.transaction", FT_STRING, BASE_NONE, NULL, 0x0,
"Message Originator", HFILL }},
{ &hf_megaco_transid,
{ "Transaction ID", "megaco.transid", FT_UINT32, BASE_DEC, NULL, 0x0,
"Transaction ID of this message", HFILL }},
{ &hf_megaco_mId,
{ "MediagatewayID", "megaco.mId", FT_STRING, BASE_NONE, NULL, 0x0,
"Mediagateway ID", HFILL }},
{ &hf_megaco_version,
{ "Version", "megaco.version", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_start,
{ "Start token", "megaco.start_token", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_megaco_h245,
{ "h245", "megaco.h245", FT_NONE, BASE_NONE, NULL, 0x0,
"Embedded H.245 message", HFILL }},
{ &hf_megaco_h223Capability,
{ "h223Capability", "megaco.h245.h223Capability", FT_NONE, BASE_NONE, NULL, 0,
"megaco.h245.H223Capability", HFILL }},
{ &hf_megaco_priority,
{ "Priority", "megaco.priority", FT_STRING, BASE_NONE, NULL, 0,
NULL, HFILL }},
GCP_HF_ARR_ELEMS("megaco",megaco_ctx_ids),
/* Add more fields here */
};
static gint *ett[] = {
&ett_megaco,
&ett_megaco_message,
&ett_megaco_message_body,
&ett_megaco_context,
&ett_megaco_command_line,
&ett_megaco_descriptors,
&ett_megaco_raw_text,
&ett_megaco_error_descriptor,
&ett_megaco_mediadescriptor,
&ett_megaco_TerminationState,
&ett_megaco_Remotedescriptor,
&ett_megaco_Localdescriptor,
&ett_megaco_LocalControldescriptor,
&ett_megaco_auditdescriptor,
&ett_megaco_eventsdescriptor,
&ett_megaco_statisticsdescriptor,
&ett_megaco_observedeventsdescriptor,
&ett_megaco_observedevent,
&ett_megaco_packagesdescriptor,
&ett_megaco_requestedevent,
&ett_megaco_signalsdescriptor,
&ett_megaco_requestedsignal,
&ett_megaco_h245,
GCP_ETT_ARR_ELEMS(megaco_ctx_ids),
};
static ei_register_info ei[] = {
{ &ei_megaco_errored_command, { "megaco.errored_command", PI_RESPONSE_CODE, PI_WARN, "Errored Command", EXPFILL }},
{ &ei_megaco_parse_error, { "megaco.parse_error", PI_MALFORMED, PI_ERROR, "Parse error", EXPFILL }},
{ &ei_megaco_error_descriptor_transaction_list, { "megaco.error_descriptor_transaction_list.invalid", PI_MALFORMED, PI_ERROR, "Sorry, can't understand errorDescriptor / transactionList", EXPFILL }},
{ &ei_megaco_audit_descriptor, { "megaco.audit.malformed", PI_MALFORMED, PI_ERROR, "Badly constructed audit descriptor (no { )", EXPFILL }},
{ &ei_megaco_signal_descriptor, { "megaco.signal_descriptor.empty", PI_PROTOCOL, PI_NOTE, "Empty Signal Descriptor", EXPFILL }},
{ &ei_megaco_no_command, { "megaco.no_command", PI_PROTOCOL, PI_WARN, "No Command detectable", EXPFILL }},
{ &ei_megaco_no_descriptor, { "megaco.no_descriptor", PI_PROTOCOL, PI_WARN, "No Descriptor detectable", EXPFILL }},
{ &ei_megaco_reason_invalid, { "megaco.change_reason.invalid", PI_MALFORMED, PI_ERROR, "Invalid Service Change Reason", EXPFILL }},
{ &ei_megaco_error_code_invalid,{ "megaco.error_code.invalid", PI_MALFORMED, PI_ERROR, "Invalid error code", EXPFILL } },
{ &ei_megaco_invalid_sdr, { "megaco.sdr.invalid", PI_MALFORMED, PI_ERROR, "Invalid Sustainable Data Rate", EXPFILL }}
};
module_t *megaco_module;
expert_module_t* expert_megaco;
proto_megaco = proto_register_protocol("MEGACO", "MEGACO", "megaco");
megaco_text_handle = register_dissector("megaco", dissect_megaco_text, proto_megaco);
proto_register_field_array(proto_megaco, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_megaco = expert_register_protocol(proto_megaco);
expert_register_field_array(expert_megaco, ei, array_length(ei));
/* Register our configuration options, particularly our ports */
megaco_module = prefs_register_protocol(proto_megaco, proto_reg_handoff_megaco);
prefs_register_uint_preference(megaco_module, "sctp.txt_port",
"MEGACO Text SCTP Port",
"Set the SCTP port for MEGACO text messages",
10, &global_megaco_txt_sctp_port);
#if 0
prefs_register_uint_preference(megaco_module, "sctp.bin_port",
"MEGACO Binary SCTP Port",
"Set the SCTP port for MEGACO binary messages",
10, &global_megaco_bin_sctp_port);
prefs_register_uint_preference(megaco_module, "tcp.bin_port",
"MEGACO Binary TCP Port",
"Set the TCP port for MEGACO binary messages",
10, &global_megaco_bin_tcp_port);
prefs_register_uint_preference(megaco_module, "udp.bin_port",
"MEGACO Binary UDP Port",
"Set the UDP port for MEGACO binary messages",
10, &global_megaco_bin_udp_port);
#endif
prefs_register_bool_preference(megaco_module, "display_raw_text",
"Display raw text for MEGACO message",
"Specifies that the raw text of the "
"MEGACO message should be displayed "
"instead of (or in addition to) the "
"dissection tree",
&global_megaco_raw_text);
prefs_register_bool_preference(megaco_module, "display_dissect_tree",
"Display tree dissection for MEGACO message",
"Specifies that the dissection tree of the "
"MEGACO message should be displayed "
"instead of (or in addition to) the "
"raw text",
&global_megaco_dissect_tree);
prefs_register_bool_preference(megaco_module, "ctx_info",
"Track Context",
"Maintain relationships between transactions and contexts "
"and display an extra tree showing context data",
&keep_persistent_data);
megaco_tap = register_tap("megaco");
/* compile patterns */
ws_mempbrk_compile(&pbrk_whitespace, " \t\r\n");
ws_mempbrk_compile(&pbrk_braces, "{}");
register_rtd_table(proto_megaco, NULL, 1, NUM_TIMESTATS, megaco_message_type, megacostat_packet, megacostat_filtercheck);
}
/* Register all the bits needed with the filtering engine */
/* The registration hand-off routine */
void
proto_reg_handoff_megaco(void)
{
static gboolean megaco_prefs_initialized = FALSE;
static dissector_handle_t megaco_text_tcp_handle;
/*
* Variables to allow for proper deletion of dissector registration when
* the user changes port from the gui.
*/
static guint txt_sctp_port;
#if 0
static guint bin_sctp_port;
static guint bin_tcp_port;
static guint bin_udp_port;
#endif
if (!megaco_prefs_initialized) {
sdp_handle = find_dissector_add_dependency("sdp", proto_megaco);
h245_handle = find_dissector_add_dependency("h245dg", proto_megaco);
h248_handle = find_dissector_add_dependency("h248", proto_megaco);
h248_otp_handle = find_dissector_add_dependency("h248_otp", proto_megaco);
data_handle = find_dissector("data");
megaco_text_tcp_handle = create_dissector_handle(dissect_megaco_text_tcp, proto_megaco);
dissector_add_uint_with_preference("tcp.port", PORT_MEGACO_TXT, megaco_text_tcp_handle);
dissector_add_uint_with_preference("udp.port", PORT_MEGACO_TXT, megaco_text_handle);
dissector_add_uint("sctp.ppi", H248_PAYLOAD_PROTOCOL_ID, megaco_text_handle);
megaco_prefs_initialized = TRUE;
} else {
dissector_delete_uint("sctp.port", txt_sctp_port, megaco_text_handle);
}
/* Set our port number for future use */
txt_sctp_port = global_megaco_txt_sctp_port;
dissector_add_uint("sctp.port", global_megaco_txt_sctp_port, megaco_text_handle);
exported_pdu_tap = find_tap_id(EXPORT_PDU_TAP_NAME_LAYER_7);
sip_hide_generated_call_ids = prefs_find_preference(prefs_find_module("sip"), "hide_generated_call_id");
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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