static void
dissect_error_cause(tvbuff_t *cause_tvb, proto_tree *parameter_tree)
{
guint16 code, length, padding_length;
proto_item *cause_item;
proto_tree *cause_tree;
tvbuff_t *parameter_tvb, *message_tvb;
code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET);
length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET);
padding_length = tvb_length(cause_tvb) - length;
cause_item = proto_tree_add_text(parameter_tree, cause_tvb, CAUSE_HEADER_OFFSET, tvb_length(cause_tvb),
"%s", val_to_str_const(code, cause_code_values, "Unknown error cause"));
cause_tree = proto_item_add_subtree(cause_item, ett_asap_cause);
proto_tree_add_item(cause_tree, hf_cause_code, cause_tvb, CAUSE_CODE_OFFSET, CAUSE_CODE_LENGTH, ENC_BIG_ENDIAN);
proto_tree_add_item(cause_tree, hf_cause_length, cause_tvb, CAUSE_LENGTH_OFFSET, CAUSE_LENGTH_LENGTH, ENC_BIG_ENDIAN);
switch(code) {
case UNRECOGNIZED_PARAMETER_CAUSE_CODE:
parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
dissect_parameter(parameter_tvb, cause_tree);
break;
case UNRECONGNIZED_MESSAGE_CAUSE_CODE:
message_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
dissect_asap(message_tvb, NULL, cause_tree);
break;
case INVALID_VALUES:
parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
dissect_parameter(parameter_tvb, cause_tree);
break;
case NON_UNIQUE_PE_IDENTIFIER:
break;
case POOLING_POLICY_INCONSISTENT_CAUSE_CODE:
parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
dissect_parameter(parameter_tvb, cause_tree);
break;
case LACK_OF_RESOURCES_CAUSE_CODE:
break;
case INCONSISTENT_TRANSPORT_TYPE_CAUSE_CODE:
parameter_tvb = tvb_new_subset_remaining(cause_tvb, CAUSE_INFO_OFFSET);
dissect_parameter(parameter_tvb, cause_tree);
break;
case INCONSISTENT_DATA_CONTROL_CONFIGURATION_CAUSE_CODE:
break;
case UNKNOWN_POOL_HANDLE:
break;
case REJECTION_DUE_TO_SECURITY_CAUSE_CODE:
break;
default:
dissect_unknown_cause(cause_tvb, cause_tree, cause_item);
break;
}
if (padding_length > 0)
proto_tree_add_item(cause_tree, hf_cause_padding, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length, ENC_NA);
}
static void
dissect_parameters(tvbuff_t *parameters_tvb, proto_tree *tree)
{
gint offset, length, total_length, remaining_length;
tvbuff_t *parameter_tvb;
offset = 0;
while((remaining_length = tvb_reported_length_remaining(parameters_tvb, offset)) > 0) {
length = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
total_length = ADD_PADDING(length);
if (remaining_length >= length)
total_length = MIN(total_length, remaining_length);
/* create a tvb for the parameter including the padding bytes */
parameter_tvb = tvb_new_subset_length(parameters_tvb, offset, total_length);
dissect_parameter(parameter_tvb, tree);
/* get rid of the handled parameter */
offset += total_length;
}
}
/*
* Returns TRUE if there's a User Information field in this SPDU, FALSE
* otherwise.
*/
static gboolean
dissect_parameters(tvbuff_t *tvb, int offset, guint16 len, proto_tree *tree,
proto_tree *ses_tree, packet_info *pinfo,
guint8 *enclosure_item_flags, struct SESSION_DATA_STRUCTURE *session)
{
gboolean has_user_information = TRUE;
proto_item *ti;
proto_tree *param_tree;
guint8 param_type;
const char *param_str;
int len_len;
guint16 param_len;
while (len != 0)
{
param_type = tvb_get_guint8(tvb, offset);
param_tree = proto_tree_add_subtree(ses_tree, tvb, offset, -1, ett_ses_param, &ti,
val_to_str(param_type, param_vals,
"Unknown parameter type (0x%02x)"));
param_str = val_to_str_const(param_type, param_vals, "Unknown");
proto_tree_add_text(param_tree, tvb, offset, 1,
"Parameter type: %s", param_str);
offset++;
len--;
param_len = get_item_len(tvb, offset, &len_len);
if (len_len > len) {
proto_item_set_len(ti, len + 1 );
proto_tree_add_text(param_tree, tvb, offset, len,
"Parameter length doesn't fit in parameter");
return has_user_information;
}
len -= len_len;
if (param_len > len) {
proto_item_set_len(ti, len + 1 + len_len);
proto_tree_add_text(param_tree, tvb, offset, len,
"Parameter length: %u, should be <= %u",
param_len, len);
return has_user_information;
}
proto_item_set_len(ti, 1 + len_len + param_len);
proto_tree_add_text(param_tree, tvb, offset, len_len,
"Parameter length: %u", param_len);
offset += len_len;
if (param_str != NULL)
{
switch(param_type)
{
case Extended_User_Data:
call_pres_dissector(tvb, offset, param_len,
pinfo, tree, param_tree, session);
break;
case User_Data:
call_pres_dissector(tvb, offset, param_len,
pinfo, tree, param_tree, session);
break;
/* handle PGI's */
case Connect_Accept_Item:
case Connection_Identifier:
case Linking_Information:
/* Yes. */
if (!dissect_parameter_group(tvb, offset, tree,
param_tree, pinfo, param_len, enclosure_item_flags, session))
has_user_information = FALSE;
break;
/* everything else is a PI */
default:
if (!dissect_parameter(tvb, offset, tree,
param_tree, pinfo, param_type, param_len,
enclosure_item_flags, session))
has_user_information = FALSE;
break;
}
}
offset += param_len;
len -= param_len;
}
return has_user_information;
}
static gboolean
dissect_parameter_group(tvbuff_t *tvb, int offset, proto_tree *tree,
proto_tree *pg_tree, packet_info *pinfo, guint16 pg_len,
guint8 *enclosure_item_flags, struct SESSION_DATA_STRUCTURE *session)
{
gboolean has_user_information = TRUE;
proto_item *ti;
proto_tree *param_tree;
guint8 param_type;
const char *param_str;
int len_len;
guint16 param_len;
while(pg_len != 0)
{
param_type = tvb_get_guint8(tvb, offset);
ti = proto_tree_add_text(pg_tree, tvb, offset, -1, "%s",
val_to_str(param_type, param_vals,
"Unknown parameter type (0x%02x)"));
param_tree = proto_item_add_subtree(ti, ett_ses_param);
param_str = val_to_str_const(param_type, param_vals, "Unknown");
proto_tree_add_text(param_tree, tvb, offset, 1,
"Parameter type: %s", param_str);
offset++;
pg_len--;
param_len = get_item_len(tvb, offset, &len_len);
if (len_len > pg_len) {
proto_item_set_len(ti, pg_len + 1);
proto_tree_add_text(param_tree, tvb, offset, pg_len,
"Parameter length doesn't fit in parameter");
return has_user_information;
}
pg_len -= len_len;
if (param_len > pg_len) {
proto_item_set_len(ti, pg_len + 1 + len_len);
proto_tree_add_text(param_tree, tvb, offset, pg_len,
"Parameter length: %u, should be <= %u",
param_len, pg_len);
return has_user_information;
}
proto_item_set_len(ti, 1 + len_len + param_len);
proto_tree_add_text(param_tree, tvb, offset, len_len,
"Parameter length: %u", param_len);
offset += len_len;
if (param_str != NULL)
{
switch(param_type)
{
/* PG's in PG's are invalid, presumably */
case Extended_User_Data:
case User_Data:
case Connect_Accept_Item:
case Connection_Identifier:
case Linking_Information:
proto_tree_add_text(param_tree, tvb, offset,
param_len,
"Parameter group inside parameter group");
break;
default:
if (!dissect_parameter(tvb, offset, tree,
param_tree, pinfo, param_type, param_len,
enclosure_item_flags, session))
has_user_information = FALSE;
break;
}
}
offset += param_len;
pg_len -= param_len;
}
return has_user_information;
}