gint
decode_visit(tvbuff_t *tvb, proto_tree *tree, gint offset)
{
guint32 to_visit_len;
guint32 visited_len;
guint32 i;
to_visit_len = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint(tree, hf_scribe_to_visit_len, tvb, offset, 4, to_visit_len);
offset += 4;
for (i = 0; i < to_visit_len; ++i){
offset = decode_nodehandle(tvb, tree, offset, ep_strdup_printf("NodeHandle to visit #%d", i+1));
if (offset == -1){
return -1;
}
}/*end for each to_visit*/
visited_len = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint(tree, hf_scribe_visited_len, tvb, offset, 4, visited_len);
offset += 4;
for (i = 0; i < visited_len; ++i){
offset = decode_nodehandle(tvb, tree, offset, ep_strdup_printf("Visited NodeHandle #%d", i+1));
if (offset == -1){
return -1;
}
}/*end for each visited*/
return offset;
}
static void
decode_lookup_msg(tvbuff_t *tvb, proto_tree *tree, gint offset)
{
if (tree){
guint8 has_content = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_past_has_content, tvb, offset, 1, FALSE);
switch (has_content){
case 0:
offset++;
break;
case 1:
offset = decode_past_content(tvb, tree, offset + 1);
break;
case 2:
offset = decode_past_error(tvb, tree, offset + 1);
break;
case 3:
default:
proto_tree_add_text(tree, tvb, offset + 6, -1, "Not supported by dissector.");
return;
}
if (offset != -1){
guint8 has_node_handle;
if (tvb_reported_length_remaining(tvb, offset) < 1){
proto_tree_add_text(tree, tvb, offset, -1, "Too short attributes!");
return;
}
has_node_handle = tvb_get_guint8(tvb, offset);
proto_tree_add_item(tree, hf_past_has_nodehandle, tvb, offset, 1, FALSE);
offset++;
if (has_node_handle != 0){
offset = decode_nodehandle(tvb, tree, offset, "Handle");
if (offset == -1){
return;
}
}
offset = decode_type_and_id(tvb, tree, offset);
if (offset != -1) {
if (tvb_reported_length_remaining(tvb, offset) < 1){
proto_tree_add_text(tree, tvb, offset, -1, "Missing attribute!");
} else {
proto_tree_add_item(tree, hf_past_cached, tvb, offset, 1, FALSE);
}
}
}
}
}
void
decode_subscribe(tvbuff_t *tvb, proto_tree *tree, gint offset)
{
if (tree){
gboolean has_content = FALSE;
gboolean has_previous_parent = FALSE;
/*visit*/
offset = decode_visit(tvb, tree, offset);
if (offset == -1){
return;
}
/*has content?*/
if (tvb_get_guint8(tvb, offset) != 0){
has_content = TRUE;
}
proto_tree_add_boolean(tree, hf_scribe_has_content, tvb, offset, 1, has_content);
offset++;
if (has_content){
decode_content(tvb, tree, offset);
} else {
proto_tree_add_item(tree, hf_scribe_id, tvb, offset, 4, FALSE);
offset += 4;
/*has previous parent?*/
if (tvb_get_guint8(tvb, offset) != 0){
has_previous_parent = TRUE;
}
proto_tree_add_boolean(tree, hf_scribe_has_previous_parent, tvb, offset, 1, has_previous_parent);
offset++;
if (has_previous_parent){
proto_tree_add_item(tree, hf_scribe_previous_parent_type, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_string(tree, hf_scribe_previous_parent, tvb, offset, 20, get_id_full(tvb, offset));
offset +=20;
}
decode_nodehandle(tvb, tree, offset, "Subscriber");
}
}
}
static void
dissect_scribe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti = NULL;
proto_tree *scribe_tree = NULL;
const gchar *type_string = NULL;
guint16 type;
gboolean has_source = FALSE;
gint offset = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Scribe");
type = tvb_get_ntohs(tvb, offset);
type_string = val_to_str(type, scribe_msg_type, "<Unknown type %d>");
if (check_col(pinfo->cinfo, COL_INFO)){
col_clear (pinfo->cinfo, COL_INFO);
col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d %s",
pinfo->srcport, pinfo->destport, type_string);
}
/*has source?*/
if (tvb_get_guint8(tvb, offset+3) != 0){
has_source = TRUE;
}
if (tree){
ti = proto_tree_add_item(tree, proto_scribe, tvb, 0, -1, FALSE);
scribe_tree = proto_item_add_subtree(ti, ett_scribe);
proto_tree_add_item(scribe_tree, hf_scribe_type, tvb, offset, 2, FALSE);
proto_tree_add_item(scribe_tree, hf_scribe_version, tvb, offset + 2, 1, FALSE);
proto_tree_add_boolean(scribe_tree, hf_scribe_has_source, tvb, offset + 3, 1, has_source);
if (has_source){
offset = decode_nodehandle(tvb, scribe_tree, offset + 4 , "Source");
}
} else {
if (has_source){
offset = get_node_handle_len(tvb, offset + 3);
}
}
if (offset == -1){
return;
}
if(check_col(pinfo->cinfo,COL_INFO)){
print_id_into_col_info(tvb, pinfo, offset, "Topic");
}
if (tree){
offset = decode_type_and_id(tvb, scribe_tree, offset);
if (offset == -1){
return;
}
switch (type){
case SCRIBE_ANYCAST_MSG:
decode_anycast(tvb, scribe_tree, offset);
break;
case SCRIBE_SUBSCRIBE_MSG:
decode_subscribe(tvb, scribe_tree, offset);
break;
case SCRIBE_SUBSCRIBE_ACK_MSG:
decode_scribe_subscribe_ack(tvb, scribe_tree, offset);
break;
case SCRIBE_SUBSCRIBE_FAILED_MSG:
decode_scribe_failed(tvb, scribe_tree, offset);
break;
case SCRIBE_PUBLISH_MSG:
case SCRIBE_PUBLISH_REQUEST_MSG:
decode_content(tvb, scribe_tree, offset);
break;
case SCRIBE_DROP_MSG:
case SCRIBE_UNSUBSCRIBE_MSG:
default:
return;/*stop dissection*/
}
}
}
static void
dissect_past(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti = NULL;
proto_tree *past_tree = NULL;
guint16 type;
const gchar *type_string = NULL;
gint offset = 0;
gint offset_dest = 0;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PAST");
type = tvb_get_ntohs(tvb, offset);
type_string = val_to_str(type, past_msg_type, "<Unknown type %d>");
if (check_col(pinfo->cinfo, COL_INFO)){
col_clear (pinfo->cinfo, COL_INFO);
col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d %s",
pinfo->srcport, pinfo->destport, type_string);
}
/*7 = 2 + 1 + 4 (args before ID)*/
offset_dest = offset + 7;
if (tree){
ti = proto_tree_add_item(tree, proto_past, tvb, 0, -1, FALSE);
past_tree = proto_item_add_subtree(ti, ett_past);
proto_tree_add_item(past_tree, hf_past_type, tvb, offset, 2, FALSE);
offset += 2;
proto_tree_add_item(past_tree, hf_past_version, tvb, offset, 1, FALSE);
offset++;
proto_tree_add_item(past_tree, hf_past_msg_id, tvb, offset, 4, FALSE);
offset = decode_type_and_id(tvb, past_tree, offset_dest);
if (offset == -1){
return;
}
offset = decode_nodehandle(tvb, past_tree, offset, "Source");
if (offset == -1){
return;
}
proto_tree_add_item(past_tree, hf_past_is_response, tvb, offset, 1, FALSE);
} else {
offset = get_node_handle_len(tvb, offset + 29);
if (offset == -1){
return;
}
}
if(check_col(pinfo->cinfo,COL_INFO)){
if (tvb_get_guint8(tvb,offset) == 0){
print_id_into_col_info(tvb, pinfo, offset_dest, "Request");
} else {
print_id_into_col_info(tvb, pinfo, offset_dest, "Response");
}
}
offset++;
switch (type){
case CACHE_MSG:
decode_cache_msg(tvb, past_tree, offset);
break;
case FETCH_HANDLE_MSG:
decode_fetch_handle_msg(tvb, past_tree, offset);
break;
case FETCH_MSG:
decode_fetch_msg(tvb, past_tree, offset);
break;
case INSERT_MSG:
decode_insert_msg(tvb, past_tree, offset);
break;
case LOOKUP_HANDLES_MSG:
decode_lookup_handle_message(tvb, past_tree, offset);
break;
case LOOKUP_MSG:
decode_lookup_msg(tvb, past_tree, offset);
break;
default:
return;/*stop dissection*/
}
}
