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wireshark/packet-tcap.c

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/* packet-tcap.c
* Routines for TCAP dissection
*
* Copyright 2000, Samuel Qu <samuel.qu [AT] utstar.com>,
*
* Michael Lum <mlum [AT] telostech.com>,
* Modified for ANSI TCAP support and many changes for
* EOC matching. (2003)
*
* (append your name here for newer version)
*
* $Id: packet-tcap.c,v 1.10 2004/03/20 07:26:41 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED"
* is a dissector file; if you just copied this from README.developer,
* don't bother with the "Copied from" - you don't even need to put
* in a "Copied from" if you copied an existing dissector, especially
* if the bulk of the code in the new dissector is your code)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gmodule.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <glib.h>
#ifdef NEED_SNPRINTF_H
# include "snprintf.h"
#endif
#include <epan/packet.h>
#include "prefs.h"
#include "asn1.h"
#include "packet-tcap.h"
Tcap_Standard_Type tcap_standard = ITU_TCAP_STANDARD;
/* saved pinfo */
static packet_info *g_pinfo = NULL;
static proto_tree *g_tcap_tree = NULL;
static gboolean g_tcap_ends_def_len = FALSE;
/* Initialize the protocol and registered fields */
static int proto_tcap = -1;
static int hf_tcap_message_type = -1;
static int hf_ansi_tcap_message_type = -1;
static int hf_tcap_tag = -1;
static int hf_tcap_length = -1;
static int hf_tcap_bytes = -1;
static int hf_tcap_app_con_name = -1;
static int hf_tcap_id = -1;
static int hf_tcap_tid = -1;
static int hf_tcap_ssn = -1; /* faked */
static int hf_tcap_dlg_type = -1;
static int hf_tcap_int = -1;
/* Initialize the subtree pointers */
static gint ett_tcap = -1;
/* Samuel */
static gint ett_otid = -1;
static gint ett_dtid = -1;
static gint ett_dlg_portion = -1;
static gint ett_dlg_req = -1;
static gint ett_dlg_rsp = -1;
static gint ett_dlg_abort = -1;
static gint ett_comps_portion = -1;
static gint ett_reason = -1;
static gint ett_component = -1;
static gint ett_problem = -1;
static gint ett_error = -1;
static gint ett_params = -1;
static gint ett_param = -1;
static dissector_handle_t data_handle;
static dissector_table_t tcap_itu_ssn_dissector_table; /* map use ssn in sccp */
static dissector_table_t tcap_ansi_ssn_dissector_table; /* map use ssn in sccp */
static gboolean lock_info_col = TRUE;
/* TCAP transaction message type definition - Samuel */
#define ST_MSG_TYP_UNI 0x61 /*0b01100001*/
#define ST_MSG_TYP_BGN 0x62 /*0b01100010*/
#define ST_MSG_TYP_CNT 0x65 /*0b01100101*/
#define ST_MSG_TYP_END 0x64 /*0b01100100*/
#define ST_MSG_TYP_PABT 0x67 /*0b01100111*/
static const value_string msg_type_strings[] = {
{ ST_MSG_TYP_UNI, "TC-UNI" },
{ ST_MSG_TYP_BGN, "TC-BEGIN" },
{ ST_MSG_TYP_CNT, "TC-CONTINUE" },
{ ST_MSG_TYP_END, "TC-END" },
{ ST_MSG_TYP_PABT, "TC-PABORT" },
{ 0, NULL },
};
/* ANSI TCAP transaction message type definition */
#define ANSI_ST_MSG_TYP_UNI 0xe1
#define ANSI_ST_MSG_TYP_QWP 0xe2
#define ANSI_ST_MSG_TYP_QWOP 0xe3
#define ANSI_ST_MSG_TYP_RSP 0xe4
#define ANSI_ST_MSG_TYP_CWP 0xe5
#define ANSI_ST_MSG_TYP_CWOP 0xe6
#define ANSI_ST_MSG_TYP_ABT 0xf6
static const value_string ansi_msg_type_strings[] = {
{ ANSI_ST_MSG_TYP_UNI, "TC-UNI" },
{ ANSI_ST_MSG_TYP_QWP, "TC-QUERY W PERM" },
{ ANSI_ST_MSG_TYP_QWOP, "TC-QUERY WO PERM" },
{ ANSI_ST_MSG_TYP_RSP, "TC-RESPONSE" },
{ ANSI_ST_MSG_TYP_CWP, "TC-CONV W PERM" },
{ ANSI_ST_MSG_TYP_CWOP, "TC-CONV WO PERM" },
{ ANSI_ST_MSG_TYP_ABT, "TC-ABORT" },
{ 0, NULL },
};
#define ST_ANSI_CMP_TAG 0xe8
#define ST_ANSI_TID_TAG 0xc7
/* TCAP TID tag value - Samuel */
#define ST_TID_SOURCE 0
#define ST_TID_DEST 1
#define ST_ITU_ORG_TID_TAG 0x48 /*0b01001000*/
#define ST_ITU_DST_TID_TAG 0x49 /*0b01001001*/
#define ST_ITU_PABT_TAG 0x4a /*0b01001010*/
#define ST_ITU_DLG_TAG 0x6b
#define ST_ITU_CMP_TAG 0x6c
static const value_string tid_strings[] = {
{ ST_ITU_ORG_TID_TAG, "Source Transaction ID" },
{ ST_ITU_DST_TID_TAG, "Destination Transaction ID" },
{ 0, NULL },
};
/* TCAP dialog type */
#define TC_DLG_REQ 0x60
#define TC_DLG_RSP 0x61
#define TC_DLG_ABRT 0x64
static const value_string dlg_type_strings[] = {
{ TC_DLG_REQ , "Dialogue Request" },
{ TC_DLG_RSP , "Dialogue Response" },
{ TC_DLG_ABRT, "Dialogue Abort" },
{ 0, NULL },
};
const value_string tcap_component_type_str[] = {
{ TCAP_COMP_INVOKE, "Invoke" },
{ TCAP_COMP_RRL, "Return Result(L)" },
{ TCAP_COMP_RE, "Return Error" },
{ TCAP_COMP_REJECT, "Reject" },
{ TCAP_COMP_RRN, "Return Result(NL)" },
{ 0, NULL } };
#define TC_DS_OK 1
#define TC_DS_FAIL 0
int
tcap_find_eoc(ASN1_SCK *asn1)
{
guint saved_offset;
guint tag;
guint len;
gboolean def_len;
saved_offset = asn1->offset;
while (!asn1_eoc(asn1, -1))
{
asn1_id_decode1(asn1, &tag);
asn1_length_decode(asn1, &def_len, &len);
if (def_len)
{
asn1->offset += len;
}
else
{
asn1->offset += tcap_find_eoc(asn1);
asn1_eoc_decode(asn1, -1);
}
}
len = asn1->offset - saved_offset;
asn1->offset = saved_offset;
return(len);
}
gboolean
tcap_check_tag(ASN1_SCK *asn1, guint tag)
{
guint saved_offset, real_tag;
if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
{
return (FALSE);
}
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &real_tag);
asn1->offset = saved_offset;
return (tag == real_tag);
}
static int
dissect_tcap_len(ASN1_SCK *asn1, proto_tree *tree, gboolean *def_len, guint *len)
{
guint saved_offset;
int ret;
saved_offset = asn1->offset;
*len = 0;
*def_len = FALSE;
ret = asn1_length_decode(asn1, def_len, len);
if (*def_len)
{
proto_tree_add_uint(tree, hf_tcap_length, asn1->tvb, saved_offset, asn1->offset - saved_offset, *len);
}
else
{
proto_tree_add_text(tree, asn1->tvb,
saved_offset, asn1->offset - saved_offset, "Length: Indefinite");
}
return TC_DS_OK;
}
static int
dissect_tcap_eoc(ASN1_SCK *asn1, proto_tree *tree)
{
guint saved_offset, ret;
saved_offset = asn1->offset;
if (tvb_length_remaining(asn1->tvb, saved_offset) <= 0)
{
return TC_DS_FAIL;
}
if (!asn1_eoc(asn1, -1))
{
return TC_DS_FAIL;
}
ret = asn1_eoc_decode(asn1, -1);
proto_tree_add_text(tree, asn1->tvb,
saved_offset, asn1->offset - saved_offset, "End of Contents");
return TC_DS_OK;
}
static int
dissect_tcap_tag(ASN1_SCK *asn1, proto_tree *tree, guint *tag, gchar * str)
{
guint saved_offset, real_tag;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &real_tag);
if ((*tag != (guint) -1) && (real_tag != *tag))
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
proto_tree_add_uint_format(tree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset,
real_tag, str);
return TC_DS_OK;
}
static int
dissect_tcap_octet(ASN1_SCK *asn1, proto_tree *tree, gchar * str)
{
guint saved_offset;
guchar my_oct;
saved_offset = asn1->offset;
asn1_octet_decode(asn1, &my_oct);
proto_tree_add_uint_format(tree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset,
my_oct, "%s %d", str, my_oct);
return TC_DS_OK;
}
static int
dissect_tcap_integer(ASN1_SCK *asn1, proto_tree *tree, guint len, gchar * str)
{
guint saved_offset;
gint32 invokeId;
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, len, &invokeId);
proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
invokeId, "%s %d", str, invokeId);
return TC_DS_OK;
}
/* dissect tid */
static int
dissect_tcap_tid(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti, int type)
{
guint saved_offset, org_offset = 0;
guint len;
guint tag;
int ret;
proto_item *tid_item;
proto_tree *subtree;
guchar *poctets;
guint32 val;
gboolean def_len;
org_offset = asn1->offset;
if ( ST_TID_SOURCE == type)
{
tid_item = proto_tree_add_text(tcap_tree, asn1->tvb, asn1->offset, -1, "Source Transaction ID");
subtree = proto_item_add_subtree(tid_item, ett_otid);
}
else
{
tid_item = proto_tree_add_text(tcap_tree, asn1->tvb, asn1->offset, -1, "Destination Transaction ID");
subtree = proto_item_add_subtree(tid_item, ett_dtid);
}
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
proto_tree_add_uint(subtree, hf_tcap_tid, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
/* error handling */
switch(type)
{
case ST_TID_SOURCE:
if (ST_ITU_ORG_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
break;
case ST_TID_DEST:
if (ST_ITU_DST_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
break;
default:
break;
}
dissect_tcap_len(asn1, subtree, &def_len, &len);
/*
* XXX - this is, I think, an OCTET STRING (SIZE(1..4)); should it
* just be put into the protocol tree as an FT_BYTES value and
* displayed in the Info column with "bytes_to_str()"?
*
* If so, should we have separate hf_tcap_source_tid and
* hf_tcap_destination_tid?
*
* Does that apply to other transaction IDs?
*/
if (len > 4)
{
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, len, &poctets);
val = 0;
memcpy(&val, poctets, len);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
proto_item_set_len(tid_item, asn1->offset - org_offset);
if (type == ST_TID_DEST)
{
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "dtid(%x) ", val);
}
else
{
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "stid(%x) ", val);
}
return TC_DS_OK;
}
/* Samuel */
/* dissect operation portion */
static int
dissect_tcap_invokeId(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
guint tag;
gboolean def_len;
#define INVOKE_ID_TAG 0x2
if (tcap_check_tag(asn1, INVOKE_ID_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Invoke ID Tag");
dissect_tcap_len(asn1, tree, &def_len, &len);
dissect_tcap_integer(asn1, tree, len, "Invoke ID:");
}
return TC_DS_OK;
}
static int
dissect_tcap_lnkId(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
guint tag;
gboolean def_len;
if (tcap_check_tag(asn1, TCAP_LINKED_ID_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Linked ID Tag");
dissect_tcap_len(asn1, tree, &def_len, &len);
dissect_tcap_integer(asn1, tree, len, "Linked ID:");
}
return TC_DS_OK;
}
static void
dissect_tcap_opr_code(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
guint tag;
gboolean got_it = FALSE;
gboolean def_len;
#define TCAP_LOC_OPR_CODE_TAG 0x02
if (tcap_check_tag(asn1, TCAP_LOC_OPR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Local Operation Code Tag");
got_it = TRUE;
}
#define TCAP_GLB_OPR_CODE_TAG 0x06
else if (tcap_check_tag(asn1, TCAP_GLB_OPR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Global Operation Code Tag");
got_it = TRUE;
}
if (got_it)
{
dissect_tcap_len(asn1, tree, &def_len, &len);
proto_tree_add_text(tree, asn1->tvb, asn1->offset, len, "Operation Code");
asn1->offset += len;
}
}
static int
dissect_tcap_param(ASN1_SCK *asn1, proto_tree *tree, guint exp_len)
{
guint orig_offset, saved_offset, len_offset;
guint tag, len;
gboolean def_len;
proto_item *item;
proto_tree *subtree;
orig_offset = asn1->offset;
#define TC_INVALID_TAG 0
while ((tvb_length_remaining(asn1->tvb, asn1->offset) > 0) &&
(!tcap_check_tag(asn1, 0)))
{
if ((exp_len != 0) &&
((asn1->offset - orig_offset) >= exp_len))
{
break;
}
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
len_offset = asn1->offset;
asn1_length_decode(asn1, &def_len, &len);
if (TCAP_CONSTRUCTOR(tag))
{
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Sequence");
subtree = proto_item_add_subtree(item, ett_params);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, len_offset - saved_offset, tag, "Sequence Tag");
if (def_len)
{
proto_tree_add_uint(subtree, hf_tcap_length, asn1->tvb,
len_offset, asn1->offset - len_offset, len);
}
else
{
proto_tree_add_text(subtree, asn1->tvb,
len_offset, asn1->offset - len_offset, "Length: Indefinite");
len = tcap_find_eoc(asn1);
}
proto_item_set_len(item,
(asn1->offset - saved_offset) + len +
(def_len ? 0 : TCAP_EOC_LEN));
dissect_tcap_param(asn1, subtree, len);
if (!def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
continue;
}
if (!def_len)
{
proto_tree_add_uint_format(tree, hf_tcap_tag, asn1->tvb,
saved_offset, len_offset - saved_offset, tag, "Parameter Tag");
proto_tree_add_text(tree, asn1->tvb,
len_offset, asn1->offset - len_offset, "Length: Indefinite");
len = tcap_find_eoc(asn1);
dissect_tcap_param(asn1, tree, len);
dissect_tcap_eoc(asn1, tree);
continue;
}
item =
proto_tree_add_text(tree, asn1->tvb,
saved_offset, (asn1->offset - saved_offset) + len, "Parameter");
subtree = proto_item_add_subtree(item, ett_param);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, len_offset - saved_offset, tag, "Parameter Tag");
proto_tree_add_uint(subtree, hf_tcap_length, asn1->tvb,
len_offset, asn1->offset - len_offset, len);
proto_tree_add_text(subtree, asn1->tvb,
asn1->offset, len, "Parameter Data");
asn1->offset += len;
}
return TC_DS_OK;
}
static proto_tree *
dissect_tcap_component(ASN1_SCK *asn1, proto_tree *tree, guint *len_p)
{
guint saved_offset;
guint tag;
proto_item *item;
proto_tree *subtree;
gboolean def_len;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Component ID");
subtree = proto_item_add_subtree(item, ett_component);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"Component ID Identifier");
dissect_tcap_len(asn1, subtree, &def_len, len_p);
proto_item_set_len(item, (asn1->offset - saved_offset) + *len_p);
return(subtree);
}
static void
dissect_tcap_problem(ASN1_SCK *asn1, proto_tree *tree)
{
guint orig_offset, saved_offset, len_offset;
guint len;
guint tag;
proto_tree *subtree;
proto_item *item = NULL;
gchar *str = NULL;
gchar *type_str = NULL;
gint32 spec;
gboolean def_len;
orig_offset = asn1->offset;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
len_offset = asn1->offset;
asn1_length_decode(asn1, &def_len, &len);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Problem Code");
subtree = proto_item_add_subtree(item, ett_problem);
if (!def_len)
{
len = tcap_find_eoc(asn1);
}
proto_item_set_len(item, (asn1->offset - saved_offset) + len +
(def_len ? 0 : TCAP_EOC_LEN));
if (len != 1)
{
proto_tree_add_text(subtree, asn1->tvb,
asn1->offset, len, "Unknown encoding of Problem Code");
asn1->offset += len;
if (!def_len)
{
asn1_eoc_decode(asn1, -1);
}
return;
}
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, 1, &spec);
switch (tag)
{
case 0x80:
type_str = "General Problem";
switch (spec)
{
case 0: str = "Unrecognized Component"; break;
case 1: str = "Mistyped Component"; break;
case 2: str = "Badly Structured Component"; break;
default:
str = "Undefined";
break;
}
break;
case 0x81:
type_str = "Invoke";
switch (spec)
{
case 0: str = "Duplicate Invoke ID"; break;
case 1: str = "Unrecognized Operation"; break;
case 2: str = "Mistyped Parameter"; break;
case 3: str = "Resource Limitation"; break;
case 4: str = "Initiating Release"; break;
case 5: str = "Unrecognized Linked ID"; break;
case 6: str = "Linked Response Unexpected"; break;
case 7: str = "Unexpected Linked Operation"; break;
default:
str = "Undefined";
break;
}
break;
case 0x82:
type_str = "Return Result";
switch (spec)
{
case 0: str = "Unrecognized Invoke ID"; break;
case 1: str = "Return Result Unexpected"; break;
case 2: str = "Mistyped Parameter"; break;
default:
str = "Undefined";
break;
}
break;
case 0x83:
type_str = "Return Error";
switch (spec)
{
case 0: str = "Unrecognized Invoke ID"; break;
case 1: str = "Return Error Unexpected"; break;
case 2: str = "Unrecognized Error"; break;
case 3: str = "Unexpected Error"; break;
case 4: str = "Mistyped Parameter"; break;
default:
str = "Undefined";
break;
}
break;
default:
type_str = "Undefined";
break;
}
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
orig_offset, len_offset - orig_offset, tag, type_str);
if (def_len)
{
proto_tree_add_uint(subtree, hf_tcap_length, asn1->tvb,
len_offset, saved_offset - len_offset, len);
}
else
{
proto_tree_add_text(subtree, asn1->tvb,
len_offset, saved_offset - len_offset, "Length: Indefinite");
}
proto_tree_add_text(subtree, asn1->tvb, saved_offset, 1,
"Problem Specifier %s", str);
}
static void
dissect_ansi_opr_code(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
guint tag;
gboolean got_it = FALSE;
gboolean def_len;
#define TCAP_NAT_OPR_CODE_TAG 0xd0
if (tcap_check_tag(asn1, TCAP_NAT_OPR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "National TCAP Operation Code Identifier");
got_it = TRUE;
}
#define TCAP_PRIV_OPR_CODE_TAG 0xd1
else if (tcap_check_tag(asn1, TCAP_PRIV_OPR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Private TCAP Operation Code Identifier");
got_it = TRUE;
}
if (got_it)
{
dissect_tcap_len(asn1, tree, &def_len, &len);
proto_tree_add_text(tree, asn1->tvb, asn1->offset, len, "Operation Code");
asn1->offset += len;
}
}
static void
dissect_ansi_problem(ASN1_SCK *asn1, proto_tree *tree)
{
guint saved_offset = 0;
guint len;
guint tag;
proto_tree *subtree;
proto_item *item = NULL;
gchar *str = NULL;
gchar *type_str = NULL;
gint32 type, spec;
gboolean def_len;
#define TCAP_PROB_CODE_TAG 0xd5
if (tcap_check_tag(asn1, TCAP_PROB_CODE_TAG))
{
str = "Problem Code Identifier";
}
else
{
/* XXX */
return;
}
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Problem Code");
subtree = proto_item_add_subtree(item, ett_problem);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag, str);
dissect_tcap_len(asn1, subtree, &def_len, &len);
proto_item_set_len(item, (asn1->offset - saved_offset) + len);
if (len != 2)
{
proto_tree_add_text(subtree, asn1->tvb,
asn1->offset, len, "Unknown encoding of Problem Code");
asn1->offset += len;
return;
}
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, 1, &type);
asn1_int32_value_decode(asn1, 1, &spec);
switch (type)
{
case 0: type_str = "Not used"; break;
case 1:
type_str = "General";
switch (spec)
{
case 1: str = "Unrecognized Component Type"; break;
case 2: str = "Incorrect Component Portion"; break;
case 3: str = "Badly Structured Component Portion"; break;
default:
str = "Undefined";
break;
}
break;
case 2:
type_str = "Invoke";
switch (spec)
{
case 1: str = "Duplicate Invoke ID"; break;
case 2: str = "Unrecognized Operation Code"; break;
case 3: str = "Incorrect Parameter"; break;
case 4: str = "Unrecognized Correlation ID"; break;
default:
str = "Undefined";
break;
}
break;
case 3:
type_str = "Return Result";
switch (spec)
{
case 1: str = "Unrecognized Correlation ID"; break;
case 2: str = "Unexpected Return Result"; break;
case 3: str = "Incorrect Parameter"; break;
default:
str = "Undefined";
break;
}
break;
case 4:
type_str = "Return Error";
switch (spec)
{
case 1: str = "Unrecognized Correlation ID"; break;
case 2: str = "Unexpected Return Error"; break;
case 3: str = "Unrecognized Error"; break;
case 4: str = "Unexpected Error"; break;
case 5: str = "Incorrect Parameter"; break;
default:
str = "Undefined";
break;
}
break;
case 5:
type_str = "Transaction Portion";
switch (spec)
{
case 1: str = "Unrecognized Package Type"; break;
case 2: str = "Incorrect Transaction Portion"; break;
case 3: str = "Badly Structured Transaction Portion"; break;
case 4: str = "Unrecognized Transaction ID"; break;
case 5: str = "Permission to Release"; break;
case 6: str = "Resource Unavailable"; break;
default:
str = "Undefined";
break;
}
break;
default:
type_str = "Undefined";
break;
}
if (spec == 255) { str = "Reserved"; }
else if (spec == 0) { str = "Not used"; }
proto_tree_add_text(subtree, asn1->tvb,
saved_offset, 1, "Problem Type %s", type_str);
proto_tree_add_text(subtree, asn1->tvb,
saved_offset + 1, 1, "Problem Specifier %s", str);
}
static void
dissect_ansi_error(ASN1_SCK *asn1, proto_tree *tree)
{
guint saved_offset = 0;
guint len;
guint tag;
proto_tree *subtree;
proto_item *item = NULL;
gchar *str = NULL;
gboolean def_len;
#define TCAP_NAT_ERR_CODE_TAG 0xd3
if (tcap_check_tag(asn1, TCAP_NAT_ERR_CODE_TAG))
{
str = "National TCAP Error Code Identifier";
}
#define TCAP_PRIV_ERR_CODE_TAG 0xd4
else if (tcap_check_tag(asn1, TCAP_PRIV_ERR_CODE_TAG))
{
str = "Private TCAP Error Code Identifier";
}
else
{
/* XXX */
return;
}
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb,
saved_offset, -1, "TCAP Error Code");
subtree = proto_item_add_subtree(item, ett_error);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag, str);
dissect_tcap_len(asn1, subtree, &def_len, &len);
proto_item_set_len(item, (asn1->offset - saved_offset) + len);
proto_tree_add_text(subtree, asn1->tvb, asn1->offset, len, "Error Code");
asn1->offset += len;
}
static void
dissect_ansi_param(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
guint tag;
gboolean got_it = FALSE;
gboolean def_len;
#define TCAP_PARAM_SET_TAG 0xf2
if (tcap_check_tag(asn1, TCAP_PARAM_SET_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Parameter Set Identifier");
got_it = TRUE;
}
#define TCAP_PARAM_SEQ_TAG 0x30
else if (tcap_check_tag(asn1, TCAP_PARAM_SEQ_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Parameter Sequence Identifier");
got_it = TRUE;
}
if (got_it)
{
dissect_tcap_len(asn1, tree, &def_len, &len);
proto_tree_add_text(tree, asn1->tvb, asn1->offset, len, "Parameter Data");
asn1->offset += len;
}
}
static void
dissect_ansi_tcap_reject(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
proto_tree *subtree;
#define COMPONENT_ID_TAG 0xcf
if (tcap_check_tag(asn1, COMPONENT_ID_TAG))
{
subtree = dissect_tcap_component(asn1, tree, &len);
switch (len)
{
case 1:
dissect_tcap_octet(asn1, subtree, "Correlation ID:");
break;
}
}
dissect_ansi_problem(asn1, tree);
dissect_ansi_param(asn1, tree);
}
static void
dissect_ansi_tcap_re(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
proto_tree *subtree;
#define COMPONENT_ID_TAG 0xcf
if (tcap_check_tag(asn1, COMPONENT_ID_TAG))
{
subtree = dissect_tcap_component(asn1, tree, &len);
switch (len)
{
case 1:
dissect_tcap_octet(asn1, tree, "Correlation ID:");
break;
}
}
dissect_ansi_error(asn1, tree);
dissect_ansi_param(asn1, tree);
}
static void
dissect_ansi_tcap_rr(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
proto_tree *subtree;
#define COMPONENT_ID_TAG 0xcf
if (tcap_check_tag(asn1, COMPONENT_ID_TAG))
{
subtree = dissect_tcap_component(asn1, tree, &len);
switch (len)
{
case 1:
dissect_tcap_octet(asn1, tree, "Correlation ID:");
break;
}
}
dissect_ansi_param(asn1, tree);
}
static void
dissect_ansi_tcap_invoke(ASN1_SCK *asn1, proto_tree *tree)
{
guint len;
proto_tree *subtree;
#define COMPONENT_ID_TAG 0xcf
if (tcap_check_tag(asn1, COMPONENT_ID_TAG))
{
subtree = dissect_tcap_component(asn1, tree, &len);
switch (len)
{
case 1:
dissect_tcap_octet(asn1, tree, "Invoke ID:");
break;
case 2:
dissect_tcap_octet(asn1, tree, "Invoke ID:");
dissect_tcap_octet(asn1, tree, "Correlation ID:");
break;
}
}
dissect_ansi_opr_code(asn1, tree);
dissect_ansi_param(asn1, tree);
}
static void
dissect_tcap_invoke(ASN1_SCK *asn1, proto_tree *tree)
{
proto_tree *subtree;
guint orig_offset, saved_offset;
guint len;
guint tag;
int ret;
proto_item *item;
gboolean def_len;
orig_offset = asn1->offset;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Component");
subtree = proto_item_add_subtree(item, ett_component);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag, "Invoke Type Tag");
dissect_tcap_len(asn1, subtree, &def_len, &len);
saved_offset = asn1->offset;
dissect_tcap_invokeId(asn1, subtree);
dissect_tcap_lnkId(asn1, subtree);
dissect_tcap_opr_code(asn1, subtree);
if (def_len)
{
len -= asn1->offset - saved_offset;
}
else
{
len = tcap_find_eoc(asn1);
}
dissect_tcap_param(asn1, subtree, len);
if (!def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(item, asn1->offset - orig_offset);
}
static void
dissect_tcap_rr(ASN1_SCK *asn1, proto_tree *tree, gchar *str)
{
guint tag, len, comp_len;
guint orig_offset, saved_offset, len_offset;
proto_item *seq_item, *item;
proto_tree *seq_subtree, *subtree;
gboolean def_len;
gboolean comp_def_len;
tag = -1;
orig_offset = asn1->offset;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Component");
subtree = proto_item_add_subtree(item, ett_component);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag, str);
dissect_tcap_len(asn1, subtree, &comp_def_len, &comp_len);
saved_offset = asn1->offset;
dissect_tcap_invokeId(asn1, subtree);
if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
{
proto_item_set_len(item, asn1->offset - orig_offset);
return;
}
saved_offset = asn1->offset;
tag = -1;
asn1_id_decode1(asn1, &tag);
if (TCAP_CONSTRUCTOR(tag))
{
len_offset = asn1->offset;
asn1_length_decode(asn1, &def_len, &len);
seq_item =
proto_tree_add_text(subtree, asn1->tvb, saved_offset, -1, "Sequence");
seq_subtree = proto_item_add_subtree(seq_item, ett_params);
proto_tree_add_uint_format(seq_subtree, hf_tcap_tag, asn1->tvb,
saved_offset, len_offset - saved_offset, tag, "Sequence Tag");
if (def_len)
{
proto_tree_add_uint(seq_subtree, hf_tcap_length, asn1->tvb,
len_offset, asn1->offset - len_offset, len);
}
else
{
proto_tree_add_text(seq_subtree, asn1->tvb,
len_offset, asn1->offset - len_offset, "Length: Indefinite");
len = tcap_find_eoc(asn1);
}
proto_item_set_len(seq_item,
(asn1->offset - saved_offset) + len +
(def_len ? 0 : TCAP_EOC_LEN));
saved_offset = asn1->offset;
dissect_tcap_opr_code(asn1, seq_subtree);
len -= asn1->offset - saved_offset;
dissect_tcap_param(asn1, seq_subtree, len);
if (!def_len)
{
dissect_tcap_eoc(asn1, seq_subtree);
}
}
if (!comp_def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(item, asn1->offset - orig_offset);
}
static int
dissect_tcap_re(ASN1_SCK *asn1, proto_tree *tree)
{
guint tag, len, comp_len;
guint orig_offset, saved_offset;
proto_item *item;
proto_tree *subtree;
gboolean comp_def_len, def_len;
tag = -1;
orig_offset = asn1->offset;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item =
proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Component");
subtree = proto_item_add_subtree(item, ett_component);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset,
tag, "Return Error Type Tag");
dissect_tcap_len(asn1, subtree, &comp_def_len, &comp_len);
if (!comp_def_len)
{
comp_len = tcap_find_eoc(asn1);
}
saved_offset = asn1->offset;
dissect_tcap_invokeId(asn1, subtree);
#define TC_LOCAL_ERR_CODE_TAG 0x2
#define TC_GBL_ERR_CODE_TAG 0x6
if (tcap_check_tag(asn1, TC_LOCAL_ERR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, subtree, &tag, "Local Error Code Tag");
}
else if (tcap_check_tag(asn1, TC_GBL_ERR_CODE_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, subtree, &tag, "Global Error Code Tag");
}
else
{
proto_tree_add_text(subtree, asn1->tvb, asn1->offset, comp_len,
"Unknown Error Code");
asn1->offset += comp_len;
if (!comp_def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(item, asn1->offset - orig_offset);
return(TC_DS_OK);
}
dissect_tcap_len(asn1, subtree, &def_len, &len);
dissect_tcap_integer(asn1, subtree, len, "Error Code:");
dissect_tcap_param(asn1, subtree, comp_len - (asn1->offset - saved_offset));
if (!comp_def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(item, asn1->offset - orig_offset);
return(TC_DS_OK);
}
static void
dissect_tcap_reject(ASN1_SCK *asn1, proto_tree *tree)
{
guint tag, comp_len;
guint saved_offset;
proto_item *item;
proto_tree *subtree;
gboolean def_len;
tag = -1;
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
item = proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Component");
subtree = proto_item_add_subtree(item, ett_component);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset,
tag, "Reject Type Tag");
dissect_tcap_len(asn1, subtree, &def_len, &comp_len);
dissect_tcap_invokeId(asn1, subtree);
dissect_tcap_problem(asn1, subtree);
if (!def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(item, asn1->offset - saved_offset);
}
static void
dissect_ansi_tcap_next_tvb(ASN1_SCK *asn1, guint len, proto_tree *tree)
{
tvbuff_t *next_tvb;
guint saved_offset;
int ret;
gboolean flag = TRUE;
guint tag;
proto_item *item, *tag_item;
proto_tree *subtree, *tag_subtree;
gboolean def_len;
if (lock_info_col) col_set_fence(g_pinfo->cinfo, COL_INFO);
next_tvb = tvb_new_subset(asn1->tvb, asn1->offset, len, len);
/* process components data */
if (!dissector_try_port(tcap_ansi_ssn_dissector_table, g_pinfo->match_port, next_tvb, g_pinfo, g_tcap_tree))
{
/* dissect cmp */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
/*
* verify tag type is known
*/
switch (tag)
{
case ANSI_TC_INVOKE_L :
case ANSI_TC_RRL :
case ANSI_TC_RE :
case ANSI_TC_REJECT :
case ANSI_TC_INVOKE_N :
case ANSI_TC_RRN :
flag = TRUE;
break;
default:
flag = FALSE;
break;
}
if (flag != FALSE)
{
item = proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Components");
subtree = proto_item_add_subtree(item, ett_component);
switch (tag)
{
case ANSI_TC_INVOKE_L :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Invoke(Last)");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_invoke(asn1, tag_subtree);
break;
case ANSI_TC_RRL :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Return Result(Last)");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_rr(asn1, tag_subtree);
break;
case ANSI_TC_RE :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Return Error");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_re(asn1, tag_subtree);
break;
case ANSI_TC_REJECT :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Reject");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_reject(asn1, tag_subtree);
break;
case ANSI_TC_INVOKE_N :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Invoke(Not Last)");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_invoke(asn1, tag_subtree);
break;
case ANSI_TC_RRN :
tag_item = proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Return Result(Not Last)");
dissect_tcap_len(asn1, subtree, &def_len, &len);
tag_subtree = proto_item_add_subtree(tag_item, ett_component);
dissect_ansi_tcap_rr(asn1, tag_subtree);
break;
}
proto_item_set_len(item, asn1->offset - saved_offset);
}
}
if (!flag)
{
/* No sub-dissection occured, treat it as raw data */
call_dissector(data_handle, next_tvb, g_pinfo, g_tcap_tree);
}
}
static int
dissect_tcap_components(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
proto_tree *subtree;
proto_item *comps_item;
guint saved_offset, comps_start;
guint len, comp_len;
gint keep_len;
gboolean comps_def_len, def_len;
guint tag;
int ret;
tvbuff_t *next_tvb;
if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
{
return TC_DS_FAIL;
}
comps_start = asn1->offset;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ITU_CMP_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
comps_item =
proto_tree_add_text(tcap_tree, asn1->tvb,
saved_offset, -1, "Components Portion");
subtree = proto_item_add_subtree(comps_item, ett_comps_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset,
asn1->offset - saved_offset, tag, "Component Portion Tag");
dissect_tcap_len(asn1, subtree, &comps_def_len, &len);
if (comps_def_len)
{
proto_item_set_len(comps_item, (asn1->offset - comps_start) + len);
}
if (lock_info_col) col_set_fence(g_pinfo->cinfo, COL_INFO);
/* call next dissector for EACH component */
keep_len =
(comps_def_len ? 0 : TCAP_EOC_LEN) +
(g_tcap_ends_def_len ? 0 : TCAP_EOC_LEN);
while (tvb_length_remaining(asn1->tvb, asn1->offset) > keep_len)
{
/* peek at tag and length */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
comp_len = 0;
def_len = FALSE;
ret = asn1_length_decode(asn1, &def_len, &comp_len);
if (def_len)
{
comp_len += (asn1->offset - saved_offset);
}
else
{
comp_len = (asn1->offset - saved_offset) + tcap_find_eoc(asn1) + TCAP_EOC_LEN;
}
next_tvb = tvb_new_subset(asn1->tvb, saved_offset, comp_len, comp_len);
asn1->offset = saved_offset;
/* process component data */
if (dissector_try_port(tcap_itu_ssn_dissector_table, g_pinfo->match_port, next_tvb, g_pinfo, g_tcap_tree))
{
proto_tree_add_text(subtree, asn1->tvb, asn1->offset, comp_len, "Component");
asn1->offset += comp_len;
}
else
{
switch (tag)
{
case TCAP_COMP_INVOKE :
dissect_tcap_invoke(asn1, subtree);
break;
case TCAP_COMP_RRL :
dissect_tcap_rr(asn1, subtree, "Return Result(Last) Type Tag");
break;
case TCAP_COMP_RE :
dissect_tcap_re(asn1, subtree);
break;
case TCAP_COMP_REJECT :
dissect_tcap_reject(asn1, subtree);
break;
case TCAP_COMP_RRN :
/* same definition as RRL */
dissect_tcap_rr(asn1, subtree, "Return Result(Not Last) Type Tag");
break;
default:
/* treat it as raw data */
call_dissector(data_handle, next_tvb, g_pinfo, g_tcap_tree);
break;
}
}
}
if (!comps_def_len)
{
dissect_tcap_eoc(asn1, subtree);
proto_item_set_len(comps_item, asn1->offset - comps_start);
}
return TC_DS_OK;
}
/* dissect dialog portion */
static int
dissect_tcap_dlg_protocol_version(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
guint saved_offset = 0;
guint len;
guint tag;
int ret;
gboolean def_len;
#define TC_DLG_PROTO_VER_TAG 0x80
if (tcap_check_tag(asn1, TC_DLG_PROTO_VER_TAG))
{
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
proto_tree_add_uint_format(tcap_tree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"Protocol Version Tag: 0x%x", tag);
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
saved_offset = asn1->offset;
ti =
proto_tree_add_bytes(tcap_tree, hf_tcap_bytes, asn1->tvb, saved_offset, len,
(guchar*)(tvb_get_ptr(asn1->tvb, saved_offset, len)));
asn1->offset += len;
}
return TC_DS_OK;
}
static int
dissect_tcap_dlg_application_context_name(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
guint saved_offset = 0;
guint name_len, len, len2;
guint tag;
subid_t *oid;
int ret;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
proto_tree_add_uint_format(tcap_tree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
"Application Context Name Tag: 0x%x", tag);
dissect_tcap_len(asn1, tcap_tree, &def_len, &name_len);
saved_offset = asn1->offset;
ret = asn1_oid_decode (asn1, &oid, &len, &len2);
proto_tree_add_bytes(tcap_tree, hf_tcap_app_con_name, asn1->tvb, saved_offset, len2, tvb_get_ptr(asn1->tvb, saved_offset, len2));
if (ret == ASN1_ERR_NOERROR) g_free(oid);
if (!def_len)
{
/* for Application Context Name Tag */
dissect_tcap_eoc(asn1, tcap_tree);
}
return TC_DS_OK;
}
static int
dissect_tcap_dlg_result(ASN1_SCK *asn1, proto_tree *tree)
{
guint tag, rtag_len, itag_len;
guint saved_offset = 0;
gint32 value;
gchar *str;
gboolean def_len;
gboolean rtag_def_len;
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Result Tag");
dissect_tcap_len(asn1, tree, &rtag_def_len, &rtag_len);
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Integer Tag");
dissect_tcap_len(asn1, tree, &def_len, &itag_len);
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, itag_len, &value);
switch (value)
{
case 0x00: str = "Accepted"; break;
case 0x01: str = "Reject-permanent"; break;
default: str = "Unknown value"; break;
}
proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
value, "%s %d", str, value);
if (!rtag_def_len)
{
/* for Result Tag */
dissect_tcap_eoc(asn1, tree);
}
return TC_DS_OK;
}
static int
dissect_tcap_dlg_result_src_diag(ASN1_SCK *asn1, proto_tree *tree)
{
guint saved_offset = 0;
guint len, tag;
gint32 value;
gboolean user;
gchar *str;
gboolean def_len;
gboolean serv_def_len;
gboolean diag_def_len;
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Result Source Diagnostic Tag");
dissect_tcap_len(asn1, tree, &diag_def_len, &len);
#define TC_DIAG_SERV_USER_TAG 0xa1
#define TC_DIAG_SERV_PROV_TAG 0xa2
if (tcap_check_tag(asn1, TC_DIAG_SERV_USER_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Dialogue Service User Tag");
user = TRUE;
}
else if (tcap_check_tag(asn1, TC_DIAG_SERV_PROV_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Dialogue Service Provider Tag");
user = FALSE;
}
else
{
proto_tree_add_text(tree, asn1->tvb, asn1->offset, len,
"Unknown Result Source Diagnostic");
asn1->offset += len;
return(TC_DS_OK);
}
dissect_tcap_len(asn1, tree, &serv_def_len, &len);
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "Integer Tag");
dissect_tcap_len(asn1, tree, &def_len, &len);
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, len, &value);
if (user)
{
switch (value)
{
case 0x00: str = "Null"; break;
case 0x01: str = "No reason given"; break;
case 0x02: str = "Application Context Name not supplied"; break;
default: str = "Unknown value"; break;
}
}
else
{
switch (value)
{
case 0x00: str = "Null"; break;
case 0x01: str = "No reason given"; break;
case 0x02: str = "No common dialogue portion"; break;
default: str = "Unknown value"; break;
}
}
proto_tree_add_int_format(tree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
value, "%s %d", str, value);
if (!serv_def_len)
{
/* for Dialogue Service User/Provider Tag */
dissect_tcap_eoc(asn1, tree);
}
if (!diag_def_len)
{
/* for Result Source Diagnostic Tag */
dissect_tcap_eoc(asn1, tree);
}
return TC_DS_OK;
}
static int
dissect_tcap_dlg_user_info(ASN1_SCK *asn1, proto_tree *tree)
{
guint tag, len;
guint saved_offset = 0;
gboolean def_len;
gboolean user_info_def_len;
#define TC_USR_INFO_TAG 0xbe
if (tcap_check_tag(asn1, TC_USR_INFO_TAG))
{
tag = -1;
dissect_tcap_tag(asn1, tree, &tag, "User Info Tag");
dissect_tcap_len(asn1, tree, &user_info_def_len, &len);
#define TC_EXT_TAG 0x28
if (tcap_check_tag(asn1, TC_EXT_TAG))
{
saved_offset = asn1->offset;
asn1_id_decode1(asn1, &tag);
proto_tree_add_uint_format(tree, hf_tcap_length, asn1->tvb, saved_offset, asn1->offset - saved_offset,
tag, "External Tag: 0x%x", tag);
dissect_tcap_len(asn1, tree, &def_len, &len);
}
proto_tree_add_text(tree, asn1->tvb, asn1->offset, len, "Parameter Data");
asn1->offset += len;
if (!user_info_def_len)
{
/* for User Information Tag */
dissect_tcap_eoc(asn1, tree);
}
}
return TC_DS_OK;
}
static int
dissect_tcap_dlg_req(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *req_item;
guint req_start = asn1->offset;
gboolean def_len;
/* dissect dialog portion */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
req_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Dialogue Request");
subtree = proto_item_add_subtree(req_item, ett_dlg_req);
proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
dissect_tcap_len(asn1, subtree, &def_len, &len);
dissect_tcap_dlg_protocol_version(asn1, subtree, NULL);
dissect_tcap_dlg_application_context_name(asn1, subtree);
dissect_tcap_dlg_user_info(asn1, subtree);
/* decode end of sequence */
if (!def_len)
{
/* for Dialogue Request Tag */
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(req_item, asn1->offset - req_start);
return TC_DS_OK;
}
static int
dissect_tcap_dlg_rsp(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *req_item;
guint req_start = asn1->offset;
gboolean def_len;
/* dissect dialog portion */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
req_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Dialogue Response");
subtree = proto_item_add_subtree(req_item, ett_dlg_rsp);
proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
dissect_tcap_len(asn1, subtree, &def_len, &len);
dissect_tcap_dlg_protocol_version(asn1, subtree, NULL);
dissect_tcap_dlg_application_context_name(asn1, subtree);
/* result */
dissect_tcap_dlg_result(asn1, subtree);
/* result source diag */
dissect_tcap_dlg_result_src_diag(asn1, subtree);
dissect_tcap_dlg_user_info(asn1, subtree);
if (!def_len)
{
/* for Dialogue Response Tag */
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(req_item, asn1->offset - req_start);
return TC_DS_OK;
}
static int
dissect_tcap_dlg_abrt(ASN1_SCK *asn1, proto_tree *tree)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *req_item;
gint32 value;
gchar *str;
gboolean def_len, abort_def_len;
/* dissect dialog pabort portion */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
req_item = proto_tree_add_text(tree, asn1->tvb, saved_offset, -1, "Dialogue Abort");
subtree = proto_item_add_subtree(req_item, ett_dlg_abort );
proto_tree_add_uint(subtree, hf_tcap_dlg_type, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag);
dissect_tcap_len(asn1, subtree, &abort_def_len, &len);
tag = -1;
dissect_tcap_tag(asn1, subtree, &tag, "Abort Source Tag");
dissect_tcap_len(asn1, subtree, &def_len, &len);
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, len, &value);
switch (value)
{
case 0x00: str = "Dialogue Service User"; break;
case 0x01: str = "Dialogue Service Provider"; break;
default: str = "Unknown value"; break;
}
proto_tree_add_int_format(subtree, hf_tcap_int, asn1->tvb, saved_offset, asn1->offset - saved_offset,
value, "Abort Source: %s %d", str, value);
dissect_tcap_dlg_user_info(asn1, subtree);
if (!abort_def_len)
{
/* for Dialogue Abort Tag */
dissect_tcap_eoc(asn1, subtree);
}
return TC_DS_OK;
}
static int
dissect_tcap_dialog_portion(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *dlg_item;
guint dlg_start = asn1->offset;
gboolean def_len, ext_tag_def_len, portion_def_len;
if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
{
return TC_DS_FAIL;
}
/* dissect dialog portion */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
/* error handling */
if (ST_ITU_DLG_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
dlg_item =
proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Dialogue Portion");
subtree = proto_item_add_subtree(dlg_item, ett_dlg_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag, "Dialogue Portion Tag");
dissect_tcap_len(asn1, subtree, &portion_def_len, &len);
if (portion_def_len)
{
proto_item_set_len(dlg_item, len);
}
ext_tag_def_len = FALSE;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
#define TC_EXT_TAG 0x28
if (TC_EXT_TAG != tag)
{
asn1->offset = saved_offset;
}
else
{
proto_tree_add_uint_format(subtree, hf_tcap_length, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"External Tag: 0x%x", tag);
dissect_tcap_len(asn1, subtree, &ext_tag_def_len, &len);
}
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
#define TC_OID_TAG 0x06
if (TC_OID_TAG != tag)
{
asn1->offset = saved_offset;
}
else
{
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"Object Identifier Tag");
dissect_tcap_len(asn1, subtree, &def_len, &len);
saved_offset = asn1->offset;
ti =
proto_tree_add_bytes(subtree, hf_tcap_bytes, asn1->tvb, saved_offset, len,
(guchar*)(tvb_get_ptr(asn1->tvb, saved_offset, len)));
asn1->offset += len;
}
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"Single-ASN.1-type Tag");
dissect_tcap_len(asn1, subtree, &def_len, &len);
proto_item_set_len(dlg_item, asn1->offset - dlg_start);
/* dialogue PDU */
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
asn1->offset = saved_offset;
switch(tag)
{
case TC_DLG_REQ:
dissect_tcap_dlg_req(asn1, subtree);
break;
case TC_DLG_RSP:
dissect_tcap_dlg_rsp(asn1, subtree);
break;
case TC_DLG_ABRT:
dissect_tcap_dlg_abrt(asn1, subtree);
break;
default:
break;
}
/* decode end of sequence */
if (!def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
if (!ext_tag_def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
if (!portion_def_len)
{
dissect_tcap_eoc(asn1, subtree);
}
proto_item_set_len(dlg_item, asn1->offset - dlg_start);
return TC_DS_OK;
}
/* dissect reason */
static int
dissect_tcap_abort_reason(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
guint saved_offset = 0;
guint tag, len;
proto_tree *subtree;
proto_item *item;
gint32 value;
gchar *str = NULL;
gboolean def_len;
#define TC_PABRT_REASON_TAG 0x4a
tag = TC_PABRT_REASON_TAG;
if (tcap_check_tag(asn1, tag))
{
saved_offset = asn1->offset;
item =
proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "PAbort Cause");
subtree = proto_item_add_subtree(item, ett_reason);
tag = -1;
dissect_tcap_tag(asn1, subtree, &tag, "PAbort Cause Tag");
dissect_tcap_len(asn1, subtree, &def_len, &len);
proto_item_set_len(item, (asn1->offset - saved_offset) + len);
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, len, &value);
switch (value)
{
case 0x00: str = "Unrecognized Message Type"; break;
case 0x01: str = "Unrecognized Transaction ID"; break;
case 0x02: str = "Badly Formatted Transaction Portion"; break;
case 0x03: str = "Incorrect Transaction Portion"; break;
case 0x04: str = "Resource Limitation"; break;
default:
str = "Undefined";
break;
}
proto_tree_add_text(subtree, asn1->tvb,
saved_offset, asn1->offset - saved_offset, "Cause Value %s (%d)",
str, value);
}
return TC_DS_OK;
}
/* dissect each type of message */
static void
dissect_tcap_unidirectional(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
dissect_tcap_components(asn1, tcap_tree);
}
static void
dissect_tcap_begin(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_SOURCE);
dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
dissect_tcap_components(asn1, tcap_tree);
}
static void
dissect_tcap_continue(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_SOURCE);
dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_DEST);
dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
dissect_tcap_components(asn1, tcap_tree);
}
static void
dissect_tcap_end(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
dissect_tcap_tid(asn1, tcap_tree, ti, ST_TID_DEST);
dissect_tcap_dialog_portion(asn1, tcap_tree, NULL);
dissect_tcap_components(asn1, tcap_tree);
}
static void
dissect_tcap_abort(ASN1_SCK *asn1, proto_tree *tree, proto_item *ti)
{
dissect_tcap_tid(asn1, tree, ti, ST_TID_DEST);
dissect_tcap_abort_reason(asn1, tree);
dissect_tcap_dialog_portion(asn1, tree, NULL);
}
/* Samuel */
static void
dissect_tcap_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tcap_tree)
{
ASN1_SCK asn1;
guint msg_type_tag;
proto_item *ti;
guint offset = 0;
guint saved_offset = 0;
guint len;
gchar *str = NULL;
asn1_open(&asn1, tvb, offset);
asn1_id_decode1(&asn1, &msg_type_tag);
str = match_strval(msg_type_tag, msg_type_strings);
if (str == NULL)
{
proto_tree_add_text(tcap_tree, asn1.tvb, offset, -1, "Unknown message type, ignoring");
return;
}
if (check_col(pinfo->cinfo, COL_INFO))
{
col_set_str(pinfo->cinfo, COL_INFO, str);
col_append_str(pinfo->cinfo, COL_INFO, " ");
}
proto_tree_add_uint_hidden(tcap_tree, hf_tcap_ssn, asn1.tvb, offset,
0, pinfo->match_port); /* len -1 is unacceptable */
ti = proto_tree_add_uint(tcap_tree, hf_tcap_message_type, asn1.tvb, offset, asn1.offset - saved_offset,
msg_type_tag);
dissect_tcap_len(&asn1, tcap_tree, &g_tcap_ends_def_len, &len);
switch(msg_type_tag)
{
case ST_MSG_TYP_UNI:
dissect_tcap_unidirectional(&asn1, tcap_tree);
break;
case ST_MSG_TYP_BGN:
dissect_tcap_begin(&asn1, tcap_tree, ti);
break;
case ST_MSG_TYP_CNT:
dissect_tcap_continue(&asn1, tcap_tree, ti);
break;
case ST_MSG_TYP_END:
dissect_tcap_end(&asn1, tcap_tree, ti);
break;
case ST_MSG_TYP_PABT:
dissect_tcap_abort(&asn1, tcap_tree, ti);
break;
default:
proto_tree_add_text(tcap_tree, asn1.tvb, offset, -1,
"Message type not handled, ignoring");
break;
}
if (!g_tcap_ends_def_len)
{
dissect_tcap_eoc(&asn1, tcap_tree);
}
asn1_close(&asn1, &saved_offset);
}
static int
dissect_ansi_tcap_components(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *cmp_item;
guint cmp_start = asn1->offset;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_CMP_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
cmp_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Components Portion");
subtree = proto_item_add_subtree(cmp_item, ett_comps_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
"Component Sequence Identifier");
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
/* call next dissector */
dissect_ansi_tcap_next_tvb(asn1, len, subtree);
proto_item_set_len(cmp_item, asn1->offset - cmp_start);
return TC_DS_OK;
}
static int
dissect_ansi_tcap_unidirectional(ASN1_SCK *asn1, proto_tree *tcap_tree)
{
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *trans_item;
guint trans_start = asn1->offset;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
trans_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Transaction Portion");
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
if (len != 0)
{
return TC_DS_FAIL;
}
proto_item_set_len(trans_item, asn1->offset - trans_start);
dissect_ansi_tcap_components(asn1, tcap_tree);
return TC_DS_OK;
}
static int
dissect_ansi_tcap_qwp_qwop(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *trans_item;
guint trans_start = asn1->offset;
guchar *poctets;
guint32 val;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
trans_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Transaction Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
"Originating Transaction ID Identifier");
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
if (len != 4)
{
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, len, &poctets);
val = 0;
memcpy(&val, poctets, len);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "otid(%x) ", val);
proto_item_set_len(trans_item, asn1->offset - trans_start);
dissect_ansi_tcap_components(asn1, tcap_tree);
return TC_DS_OK;
}
static int
dissect_ansi_tcap_abort(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *trans_item;
guint trans_start = asn1->offset;
guchar *poctets;
guint32 val;
gint32 value;
gboolean def_len;
gchar *str;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
trans_item =
proto_tree_add_text(tcap_tree, asn1->tvb,
saved_offset, -1, "Transaction Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb,
saved_offset, asn1->offset - saved_offset, tag,
"Responding Transaction ID Identifier");
dissect_tcap_len(asn1, subtree, &def_len, &len);
if (len != 4)
{
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, len, &poctets);
val = 0;
memcpy(&val, poctets, len);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
proto_item_set_len(trans_item, asn1->offset - trans_start);
if (tvb_length_remaining(asn1->tvb, asn1->offset) <= 0)
{
proto_tree_add_text(tcap_tree, asn1->tvb, asn1->offset, -1,
"!!! Missing Component Portion !!!");
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
#define ANSI_TC_PABRT_CAUSE_TAG 0xd7
if (tag == ANSI_TC_PABRT_CAUSE_TAG)
{
trans_item =
proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "P-Abort Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_abort);
dissect_tcap_len(asn1, subtree, &def_len, &len);
proto_item_set_len(trans_item, (asn1->offset - saved_offset) + len);
saved_offset = asn1->offset;
asn1_int32_value_decode(asn1, len, &value);
switch (value)
{
case 1: str = "Unrecognized Package Type"; break;
case 2: str = "Incorrect Transaction Portion"; break;
case 3: str = "Badly Structured Transaction Portion"; break;
case 4: str = "Unrecognized Transaction ID"; break;
case 5: str = "Permission to Release"; break;
case 6: str = "Resource Unavailable"; break;
default:
str = "Undefined";
break;
}
proto_tree_add_text(subtree, asn1->tvb,
saved_offset, asn1->offset - saved_offset, "P-Abort Cause Value %s (%d)",
str, value);
}
#define ANSI_TC_UABRT_INFO_TAG 0xd8
else if (tag == ANSI_TC_UABRT_INFO_TAG)
{
trans_item =
proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "U-Abort Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_abort);
dissect_tcap_len(asn1, subtree, &def_len, &len);
if (len > 0)
{
dissect_tcap_integer(asn1, subtree, len, "User Abort Information:");
}
}
return TC_DS_OK;
}
static int
dissect_ansi_tcap_rsp(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *trans_item;
guint trans_start = asn1->offset;
guchar *poctets;
guint32 val;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
trans_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Transaction Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
"Responding Transaction ID Identifier");
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
if (len != 4)
{
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, len, &poctets);
val = 0;
memcpy(&val, poctets, len);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
proto_item_set_len(trans_item, asn1->offset - trans_start);
dissect_ansi_tcap_components(asn1, tcap_tree);
return TC_DS_OK;
}
static int
dissect_ansi_tcap_cwp_cwop(ASN1_SCK *asn1, proto_tree *tcap_tree, proto_item *ti)
{
proto_tree *subtree;
guint saved_offset = 0;
guint len;
guint tag;
int ret;
proto_item *trans_item;
guint trans_start = asn1->offset;
guchar *poctets;
guint32 val;
gboolean def_len;
saved_offset = asn1->offset;
ret = asn1_id_decode1(asn1, &tag);
if (ST_ANSI_TID_TAG != tag)
{
asn1->offset = saved_offset;
return TC_DS_FAIL;
}
trans_item = proto_tree_add_text(tcap_tree, asn1->tvb, saved_offset, -1, "Transaction Portion");
subtree = proto_item_add_subtree(trans_item, ett_dlg_portion);
proto_tree_add_uint_format(subtree, hf_tcap_tag, asn1->tvb, saved_offset, asn1->offset - saved_offset, tag,
"Transaction ID Identifier");
dissect_tcap_len(asn1, tcap_tree, &def_len, &len);
if (len != 8)
{
return TC_DS_FAIL;
}
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, 4, &poctets);
val = 0;
memcpy(&val, poctets, 4);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "otid(%x) ", val);
saved_offset = asn1->offset;
ret = asn1_string_value_decode(asn1, 4, &poctets);
val = 0;
memcpy(&val, poctets, 4);
ti = proto_tree_add_uint(subtree, hf_tcap_id, asn1->tvb, saved_offset, asn1->offset - saved_offset, val);
g_free(poctets);
if (check_col(g_pinfo->cinfo, COL_INFO))
col_append_fstr(g_pinfo->cinfo, COL_INFO, "rtid(%x) ", val);
proto_item_set_len(trans_item, asn1->offset - trans_start);
dissect_ansi_tcap_components(asn1, tcap_tree);
return TC_DS_OK;
}
static void
dissect_ansi_tcap_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tcap_tree)
{
ASN1_SCK asn1;
guint msg_type_tag;
proto_item *ti;
guint offset = 0;
guint saved_offset = 0;
guint len;
gchar *str = NULL;
gboolean def_len;
asn1_open(&asn1, tvb, offset);
asn1_id_decode1(&asn1, &msg_type_tag);
str = match_strval(msg_type_tag, ansi_msg_type_strings);
if (str == NULL)
{
proto_tree_add_text(tcap_tree, asn1.tvb, offset, -1, "Unknown message type, ignoring");
return;
}
if (check_col(pinfo->cinfo, COL_INFO))
{
col_set_str(pinfo->cinfo, COL_INFO, str);
col_append_str(pinfo->cinfo, COL_INFO, " ");
}
proto_tree_add_uint_hidden(tcap_tree, hf_tcap_ssn, asn1.tvb, offset,
0, pinfo->match_port); /* len -1 is unacceptable */
ti = proto_tree_add_uint(tcap_tree, hf_ansi_tcap_message_type, asn1.tvb, offset, asn1.offset - saved_offset,
msg_type_tag);
dissect_tcap_len(&asn1, tcap_tree, &def_len, &len);
switch(msg_type_tag)
{
case ANSI_ST_MSG_TYP_UNI:
dissect_ansi_tcap_unidirectional(&asn1, tcap_tree);
break;
case ANSI_ST_MSG_TYP_QWP:
dissect_ansi_tcap_qwp_qwop(&asn1, tcap_tree, ti);
break;
case ANSI_ST_MSG_TYP_QWOP:
dissect_ansi_tcap_qwp_qwop(&asn1, tcap_tree, ti);
break;
case ANSI_ST_MSG_TYP_RSP:
dissect_ansi_tcap_rsp(&asn1, tcap_tree, ti);
break;
case ANSI_ST_MSG_TYP_CWP:
dissect_ansi_tcap_cwp_cwop(&asn1, tcap_tree, ti);
break;
case ANSI_ST_MSG_TYP_CWOP:
dissect_ansi_tcap_cwp_cwop(&asn1, tcap_tree, ti);
break;
case ANSI_ST_MSG_TYP_ABT:
dissect_ansi_tcap_abort(&asn1, tcap_tree, ti);
break;
default:
proto_tree_add_text(tcap_tree, asn1.tvb, offset, -1,
"Message type not handled, ignoring");
break;
}
asn1_close(&asn1, &saved_offset);
}
/* Code to actually dissect the packets */
static void
dissect_tcap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *tcap_tree;
g_pinfo = pinfo;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TCAP");
/* In the interest of speed, if "tree" is NULL, don't do any
* work not necessary to generate protocol tree items.
*/
if (tree)
{
ti = proto_tree_add_item(tree, proto_tcap, tvb, 0, -1, FALSE);
tcap_tree = proto_item_add_subtree(ti, ett_tcap);
g_tcap_tree = tree;
if (tcap_standard == ITU_TCAP_STANDARD)
{
dissect_tcap_message(tvb, pinfo, tcap_tree);
}
else
{
dissect_ansi_tcap_message(tvb, pinfo, tcap_tree);
}
}
}
/* Register the protocol with Ethereal */
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_tcap(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
/*{ &hf_tcap_FIELDABBREV,
{ "FIELDNAME", "PROTOABBREV.FIELDABBREV",
FIELDTYPE, FIELDBASE, FIELDCONVERT, BITMASK,
"FIELDDESCR" }
},*/
{ &hf_tcap_tag,
{ "Tag", "tcap.msgtype",
FT_UINT8, BASE_HEX, NULL, 0,
"", HFILL }
},
{ &hf_tcap_length,
{ "Length", "tcap.len",
FT_UINT8, BASE_HEX, NULL, 0,
"", HFILL }
},
{ &hf_tcap_id,
{ "Value", "tcap.id",
FT_UINT8, BASE_HEX, NULL, 0,
"", HFILL }
},
{ &hf_tcap_message_type,
{ "Message Type", "tcap.msgtype",
FT_UINT8, BASE_HEX, VALS(msg_type_strings), 0,
"", HFILL }
},
{ &hf_ansi_tcap_message_type,
{ "Message Type", "tcap.msgtype",
FT_UINT8, BASE_HEX, VALS(ansi_msg_type_strings), 0,
"", HFILL }
},
{ &hf_tcap_tid,
{ "Transaction Id", "tcap.tid",
FT_UINT32, BASE_DEC, VALS(tid_strings), 0,
"", HFILL }
},
{ &hf_tcap_ssn,
{ "Called or Calling SubSystem Number", "tcap.ssn",
FT_UINT8, BASE_DEC, 0x0, 0x0,
"", HFILL }
},
{ &hf_tcap_dlg_type,
{ "Dialogue Type", "tcap.dlgtype",
FT_UINT8, BASE_HEX, VALS(dlg_type_strings), 0,
"", HFILL }
},
{ &hf_tcap_app_con_name,
{ "Application Context Name", "tcap.dlg.appconname",
FT_BYTES, BASE_HEX, 0, 0,
"", HFILL }
},
{ &hf_tcap_bytes,
{ "Binary Data", "tcap.data",
FT_BYTES, BASE_HEX, 0, 0,
"", HFILL }
},
{ &hf_tcap_int,
{ "Integer Data", "tcap.data",
FT_INT32, BASE_DEC, 0, 0,
"", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_tcap,
&ett_otid,
&ett_dtid,
&ett_dlg_portion,
&ett_comps_portion,
&ett_reason,
&ett_dlg_req,
&ett_dlg_rsp,
&ett_dlg_abort,
&ett_component,
&ett_error,
&ett_problem,
&ett_params,
&ett_param,
};
static enum_val_t tcap_options[] = {
{ "ITU", ITU_TCAP_STANDARD },
{ "ANSI", ANSI_TCAP_STANDARD },
{ NULL, 0 }
};
module_t *tcap_module;
/* Register the protocol name and description */
proto_tcap = proto_register_protocol("Transaction Capabilities Application Part",
"TCAP", "tcap");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_tcap, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
tcap_module = prefs_register_protocol(proto_tcap, NULL);
prefs_register_enum_preference(tcap_module, "standard", "TCAP standard",
"The SS7 standard used in TCAP packets",
(gint *)&tcap_standard, tcap_options, FALSE);
prefs_register_bool_preference(tcap_module, "lock_info_col", "Lock Info column",
"Always show TCAP in Info column",
&lock_info_col);
/* we will fake a ssn subfield which has the same value obtained from sccp */
tcap_itu_ssn_dissector_table = register_dissector_table("tcap.itu_ssn", "ITU TCAP SSN", FT_UINT8, BASE_DEC);
tcap_ansi_ssn_dissector_table = register_dissector_table("tcap.ansi_ssn", "ANSI TCAP SSN", FT_UINT8, BASE_DEC);
}
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_tcap(void)
{
dissector_handle_t tcap_handle;
tcap_handle = create_dissector_handle(dissect_tcap,
proto_tcap);
dissector_add("sccp.ssn", 5, tcap_handle); /* MAP*/
dissector_add("sccp.ssn", 6, tcap_handle); /* HLR*/
dissector_add("sccp.ssn", 7, tcap_handle); /* VLR */
dissector_add("sccp.ssn", 8, tcap_handle); /* MSC */
dissector_add("sccp.ssn", 9, tcap_handle); /* EIR */
dissector_add("sccp.ssn", 10, tcap_handle); /* EIR */
dissector_add("sccp.ssn", 11, tcap_handle); /* SMS/MC */
dissector_add("sccp.ssn", 12, tcap_handle); /* IS41 OTAF */
dissector_add("sua.ssn", 5, tcap_handle); /* MAP*/
dissector_add("sua.ssn", 6, tcap_handle); /* HLR*/
dissector_add("sua.ssn", 7, tcap_handle); /* VLR */
dissector_add("sua.ssn", 8, tcap_handle); /* MSC */
dissector_add("sua.ssn", 9, tcap_handle); /* EIR */
dissector_add("sua.ssn", 10, tcap_handle); /* EIR */
dissector_add("sua.ssn", 11, tcap_handle); /* SMS/MC */
dissector_add("sua.ssn", 12, tcap_handle); /* IS41 OTAF */
data_handle = find_dissector("data");
}
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