static void
dissect_dtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *dtp_tree;
proto_tree *tlv_tree;
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DTP");
col_set_str(pinfo->cinfo, COL_INFO, "Dynamic Trunk Protocol");
ti = proto_tree_add_item(tree, proto_dtp, tvb, offset, -1, ENC_NA);
dtp_tree = proto_item_add_subtree(ti, ett_dtp);
/* We assume version */
proto_tree_add_item(dtp_tree, hf_dtp_version, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
int type, length, valuelength;
proto_item * tlv_length_item;
/* XXX - why not just let tvbuff exceptions handle this? */
if (tvb_reported_length_remaining(tvb, offset) < 4) {
expert_add_info(pinfo, dtp_tree, &ei_dtp_truncated);
break;
}
type = tvb_get_ntohs(tvb, offset);
length = tvb_get_ntohs(tvb, offset + 2);
ti = proto_tree_add_text(dtp_tree, tvb, offset, length, "%s",
val_to_str(type, dtp_tlv_type_vals, "Unknown TLV type: 0x%02x"));
tlv_tree = proto_item_add_subtree(ti, ett_dtp_tlv);
proto_tree_add_uint(tlv_tree, hf_dtp_tlvtype, tvb, offset, 2, type);
offset+=2;
tlv_length_item = proto_tree_add_uint(tlv_tree, hf_dtp_tlvlength, tvb, offset, 2, length);
offset+=2;
if (length <= 4) {
/* Length includes type and length fields, so it
must be >= 4, and no known TLVs have a value
length of 0, so it must be > 4. */
expert_add_info(pinfo, tlv_length_item, &ei_dtp_tlv_length_too_short);
break;
}
valuelength = (length-4);
dissect_dtp_tlv(pinfo, tvb, offset, valuelength, tlv_tree, ti, tlv_length_item, (guint8) type);
offset += valuelength;
}
}
static void
dissect_dtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *dtp_tree = NULL;
proto_tree *tlv_tree=NULL;
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DTP");
col_set_str(pinfo->cinfo, COL_INFO, "Dynamic Trunking Protocol");
if (tree) {
ti = proto_tree_add_item(tree, proto_dtp, tvb, offset, -1, FALSE);
dtp_tree = proto_item_add_subtree(ti, ett_dtp);
}
/* We assume version */
proto_tree_add_item(dtp_tree, hf_dtp_version, tvb, offset, 1, FALSE);
offset += 1;
while (tvb_reported_length_remaining(tvb, offset) > 0) {
int type, length, valuelength;
type = tvb_get_ntohs(tvb, offset);
length = tvb_get_ntohs(tvb, offset + 2);
valuelength = (length-4);
/* make sure still in valid tlv */
if ((valuelength < 1) || ( length > tvb_length_remaining(tvb, offset) ))
break;
ti = proto_tree_add_text(dtp_tree, tvb, offset, length, "%s",
val_to_str(type, dtp_tlv_type_vals, "Unknown TLV type: 0x%02x"));
tlv_tree = proto_item_add_subtree(ti, ett_dtp_tlv);
proto_tree_add_uint(tlv_tree, hf_dtp_tlvtype, tvb, offset, 2, type);
offset+=2;
proto_tree_add_uint(tlv_tree, hf_dtp_tlvlength, tvb, offset, 2, length);
offset+=2;
if (valuelength > 0) {
dissect_dtp_tlv(tvb, offset, valuelength, tlv_tree, ti, (guint8) type);
}
offset += valuelength;
}
}
