// This message is handled by the Link SAP.
//
// If this MIHF is the destination of the message, forward it to the
// default Link SAP. If not then forward it to a peer MIHF.
bool command_service::link_actions_request(meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, "(mics) received a Link_Actions.request from",
in->source().to_string());
if(utils::this_mihf_is_destination(in)) {
//
// Kick this message to MIH_Link SAP.
//
// The solution found to handle this corner case in the
// 802.21 standard was to send the message, as is, to the
// link sap.
//
in->destination(mih::id("link"));
_lpool.add(in);
in->source(mihfid);
_transmit(in);
return false;
} else {
utils::forward_request(in, _lpool, _transmit);
return false;
}
return false;
}
/**
* Link Get Parameters Confirm message handler.
*
* @param in input message.
* @param out output message.
* @return true if the response is sent immediately or false otherwise.
*/
bool command_service::link_get_parameters_confirm(meta_message_ptr &in,
meta_message_ptr &out)
{
ODTONE_LOG(1, "(mics) received Link_Get_Parameters.confirm from ",
in->source().to_string());
_link_abook.reset(in->source().to_string());
if(_lpool.set_user_tid(in)) {
mih::status st;
boost::optional<mih::link_param_list> lpl;
boost::optional<mih::link_states_rsp_list> lsrl;
boost::optional<mih::link_desc_rsp_list> ldrl;
*in >> mih::confirm(mih::confirm::link_get_parameters)
& mih::tlv_status(st)
& mih::tlv_link_parameters_status_list(lpl)
& mih::tlv_link_states_rsp(lsrl)
& mih::tlv_link_descriptor_rsp(ldrl);
if(st == mih::status_success) {
mih::link_status_rsp link_status;
link_status.states_rsp_list = lsrl.get();
link_status.param_list = lpl.get();
link_status.desc_rsp_list = ldrl.get();
_lrpool.add(in->source().to_string(),
in->tid(),
link_status);
}
return false;
}
// This message is handled by the Link SAP.
//
// If this MIHF is the destination of the message, forward it to the
// default Link SAP. If not then forward it to a peer MIHF.
bool command_service::link_get_parameters_request(meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, "(mics) received a Link_Get_Parameters.request from",
in->source().to_string());
if(utils::this_mihf_is_destination(in)) {
//
// Kick this message to MIH_Link SAP.
//
// The solution found to handle this corner case in the
// 802.21 standard was to send the message, as is, to the
// link sap.
//
// local_transactions was made to handle request's
// from users to peer mihf's but in this case we add an
// entry to handle the MIH_Link_Get_Parameters and
// Link_Get_Parameters.
//
in->destination(mih::id("link"));
_lpool.add(in);
in->source(mihfid);
_transmit(in);
return false;
} else {
utils::forward_request(in, _lpool, _transmit);
return false;
}
return false;
}
/**
* Checks, in the transaction pool, if the incoming message belongs to a pending
* transaction. If true it runs the transaction, otherwise it creates a new
* transaction.
*
* @param in The input message.
*/
void message_in::operator()(meta_message_ptr& in)
{
// TODO: FIXME: check page 143 when adding support for fragment payload
if ((in->ackrsp() && (in->opcode() == mih::operation::request || in->opcode() == mih::operation::indication))
||
(!in->ackrsp() && in->opcode() == mih::operation::response)
||
(in->ackrsp() && in->opcode() == mih::operation::response && in->has_service_specific_tlv()))
{
// src
src_transaction_ptr t;
_tpool.find(in->source(), in->tid(), t);
if (t) {
t->in = in;
t->msg_in_avail = true;
if (t->start_ack_requestor)
t->ack_requestor();
if (t->start_ack_responder)
t->ack_responder();
if(t->transaction_status == ONGOING)
if(!(in->ackrsp() == true && in->opcode() == mih::operation::request))
t->run();
if (t->transaction_status != ONGOING && t->ack_requestor_status != ONGOING)
_tpool.del(t);
} else {
new_dst_transaction(in);
}
} else {
dst_transaction_ptr t;
_tpool.find(in->source(), in->tid(), t);
if (t) {
t->in = in;
t->msg_in_avail = true;
if (t->start_ack_requestor)
t->ack_requestor();
if(t->transaction_status == ONGOING)
t->run();
if (t->start_ack_responder && t->transaction_status == ONGOING)
t->ack_responder();
if (t->transaction_status != ONGOING && t->ack_requestor_status != ONGOING)
_tpool.del(t);
} else {
new_dst_transaction(in);
}
}
}
/**
* Asks for the capabilities of all local Link SAPs.
*
* @param in The input message.
* @param out The output message.
* @return Always false, because it does not send any response directly.
*/
bool service_management::link_capability_discover_request(meta_message_ptr &in,
meta_message_ptr &out)
{
// Asks for local Link SAPs capabilities
ODTONE_LOG(1, "(mism) gathering information about local Link SAPs capabilities");
*out << mih::request(mih::request::capability_discover);
out->tid(in->tid());
out->destination(in->source());
// Check if the Link SAP is still active
uint16 fails = _link_abook.fail(out->destination().to_string());
if(fails > kConf_MIHF_Link_Delete_Value) {
mih::octet_string dst = out->destination().to_string();
_link_abook.inactive(dst);
// Update MIHF capabilities
utils::update_local_capabilities(_abook, _link_abook, _user_abook);
}
else {
ODTONE_LOG(1, "(mics) forwarding Link_Capability_Discover.request to ",
out->destination().to_string());
utils::forward_request(out, _lpool, _transmit);
}
return false;
}
//
// Currently Command_Service messages are handled by a default local
// user. If this MIHF is the destination of the message, check for a
// pending transaction and forward the message.
//
bool command_service::generic_command_response(const char *recv_msg,
const char *send_msg,
meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, recv_msg, in->source().to_string());
if(utils::this_mihf_is_destination(in)) {
//
// Kick this message to default MIH User as an indication
//
log(1, send_msg);
in->opcode(mih::operation::confirm);
in->destination(mih::id("user"));
//
// source identifier is the remote MIHF
//
_transmit(in);
return false;
} else {
utils::forward_request(in, _lpool, _transmit);
return false;
}
}
/**
* Check if there's a handler for this message and call it, else
* discard message.
*
* @param in The input message.
* @param out The output message.
*/
bool sac_process_message(meta_message_ptr& in, meta_message_ptr& out)
{
// discard messages that this MIHF broadcasted to itself
// discard messages that are not destined to this MIHF or if
// multicast messages are not supported
if(in->source() == mihfid) {
ODTONE_LOG(1, "(sac) Discarding message! Reason: ",
"message was broadcasted to itself");
return false;
}
if(!utils::this_mihf_is_destination(in) && !utils::is_multicast(in)) {
ODTONE_LOG(1, "(sac) Discarding message! Reason: ",
"this is not the message destination");
return false;
}
/** __no__ authentication at this point */
uint mid = in->mid();
//
// no thread safety because insertion should __only__ be made
// on MIHF initialization
//
std::map<uint, handler_t>::iterator it;
it = _callbacks.find(mid);
if(it != _callbacks.end()) {
handler_t process_message = it->second;
bool rsp;
try {
rsp = process_message(in, out);
} catch(mih::bad_tlv) {
ODTONE_LOG(1, "Discarding malformed message.");
return false;
}
// set ip and port of response message
out->ip(in->ip());
out->scope(in->scope());
out->port(in->port());
// response message must have the same tid
out->tid(in->tid());
return rsp;
} else {
ODTONE_LOG(1, "(sac) (warning) message with mid: ", mid,
" unknown, discarding.");
}
return false;
}
/**
* Piggyback local MIHF Capabilities in request message.
*
* @param in input message.
* @param out output message.
*/
void service_management::piggyback_capabilities(meta_message_ptr& in,
meta_message_ptr& out)
{
// Get local capabilities
address_entry mihf_cap = _abook.get(mihfid_t::instance()->to_string());
*out << mih::request(mih::request::capability_discover)
& mih::tlv_net_type_addr_list(mihf_cap.capabilities_list_net_type_addr)
& mih::tlv_event_list(mihf_cap.capabilities_event_list)
& mih::tlv_command_list(mihf_cap.capabilities_cmd_list)
& mih::tlv_query_type_list(mihf_cap.capabilities_query_type)
& mih::tlv_transport_option_list(mihf_cap.capabilities_trans_list)
& mih::tlv_mbb_ho_supp_list(mihf_cap.capabilities_mbb_ho_supp);
out->tid(in->tid());
out->source(in->source());
out->destination(in->destination());
}
// log received message type, and forward it
bool event_service::link_down_indication(meta_message_ptr &in, meta_message_ptr&)
{
// if(in->payload().size() == 0)
// return false;
log(1, "(mies) received Link_Down.indication from ",
in->source().to_string());
link_event_forward(in, mih::link_down);
return false;
}
// Check if there's a pending transaction and forward the message in
// case there is.
bool command_service::link_actions_response(meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, "(mics) received Link_Actions.response from ",
in->source().to_string());
if(!_lpool.set_user_tid(in))
{
log(1, "(mics) no local pending transaction for this message, discarding");
return false;
}
in->source(mihfid);
log(1, "(mics) forwarding Link_Actions.response to ", in->destination().to_string());
_transmit(in);
return false;
}
// Check if there's a pending transaction and forward the message in
// case there is.
bool command_service::link_configure_thresholds_response(meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, "(mics) received Link_Configure_Thresholds.response from ",
in->source().to_string());
if(!_lpool.set_user_tid(in)) {
log(1, "(mics) warning: no local transaction for this msg ",
"discarding it");
return false;
}
in->source(mihfid);
log(1, "(mics) forwarding Link_Configure_Thresholds.response to ", in->destination().to_string());
_transmit(in);
return false;
}
bool event_service::link_pdu_transmit_status_indication(meta_message_ptr &in,
meta_message_ptr&)
{
// if(in->payload().size() == 0)
// return false;
log(1, "(mies) received Link_PDU_Transmit_Status.indication from ",
in->source().to_string());
link_event_forward(in, mih::link_pdu_transmit_status);
return false;
}
// This MIHF is the destination of the Event_Unsubscribe.request.
// Deserialize message, unsubscribe user and send a response
bool event_service::local_event_unsubscribe_request(meta_message_ptr &in,
meta_message_ptr &out)
{
mih::status st;
mih::link_tuple_id link;
mih::event_list events;
*in >> mih::request(mih::request::event_unsubscribe)
& mih::tlv_link_identifier(link)
& mih::tlv_event_list(events);
st = unsubscribe(in->source(), link, events);
*out << mih::response(mih::response::event_unsubscribe)
& mih::tlv_status(st)
& mih::tlv_link_identifier(link)
& mih::tlv_event_list(events);
out->tid(in->tid());
out->destination(in->source());
return true;
}
// Check if this MIHF is the destination of the message or if it needs
// to forward the message to a peer MIHF.
bool event_service::event_subscribe_request(meta_message_ptr &in,
meta_message_ptr &out)
{
log(1, "(mies) received Event_Subscribe.request from ",
in->source().to_string());
if (utils::this_mihf_is_destination(in)) {
return local_event_subscribe_request(in, out);
} else {
utils::forward_request(in, _lpool, _transmit);
return false;
}
return false;
}
// send message for all users subscribed to event from link identifier
void event_service::msg_forward(meta_message_ptr &msg,
mih::link_tuple_id &li,
mih::event_list_enum event)
{
std::list<event_registration_t>::iterator it;
int i = 0; // for logging purposes
msg->source(mihfid);
for(it = _event_subscriptions.begin();
it != _event_subscriptions.end();
it++, i++) {
if ((it->event == event) &&(it->link == li)) {
log(3, i, " (mies) found registration of user: "******" for event type ", event);
msg->destination(mih::id(it->user));
_transmit(msg);
}
}
}
/**
* Link Get Parameters Response message handler.
*
* @param in The input message.
* @param out The output message.
* @return True if the response is sent immediately or false otherwise.
*/
bool command_service::link_get_parameters_response(meta_message_ptr &in,
meta_message_ptr &out)
{
ODTONE_LOG(1, "(mics) received Link_Get_Parameters.response from ",
in->source().to_string());
if(!_lpool.set_user_tid(in)) {
ODTONE_LOG(1, "(mics) warning: no local transaction for this msg ",
"discarding it");
return false;
}
ODTONE_LOG(1, "(mics) forwarding Link_Get_Parameters.response to ",
in->destination().to_string());
_transmit(in);
return false;
}
// A peer MIHF sent a Event_Unubscribe.response, check if we have a
// pending transaction with a local user. If so, then remove the
// subscription of the user to the link and events that came in the
// response.
bool event_service::event_unsubscribe_response(meta_message_ptr &in,
meta_message_ptr &)
{
log(1, "(mies) received Event_Unsubscribe.response from ",
in->source().to_string());
// do we have a request from a user?
if (!_lpool.set_user_tid(in)) {
log(1, "(mics) warning: no local transaction for this msg ",
"discarding it");
return false;
}
mih::status st;
mih::link_tuple_id link;
mih::event_list events;
mih::message pin;
// parse incoming message to (event_registration_t) reg
*in >> mih::response()
& mih::tlv_status(st)
& mih::tlv_link_identifier(link)
& mih::tlv_event_list(events);
// remove subscription
if (st == mih::status_success)
st = unsubscribe(mih::id(in->destination().to_string()), link, events);
log(1, "(mies) forwarding Event_Unsubscribe.response to ",
in->destination().to_string());
// forward to user
_transmit(in);
return false;
}
bool sac_process_message(meta_message_ptr& in, meta_message_ptr& out)
{
// discard messages that this MIHF broadcasted to itself
if (in->source() == mihfid)
return false;
/** __no__ authentication at this point */
uint mid = in->mid();
//
// no thread safety because insertion should __only__ be made
// on MIHF initialization
//
std::map<uint, handler_t>::iterator it;
it = _callbacks.find(mid);
if(it != _callbacks.end()) {
handler_t process_message = it->second;
bool rsp = process_message(in, out);
// set ip and port of response message
out->ip(in->ip());
out->port(in->port());
// response message must have the same tid
out->tid(in->tid());
return rsp;
} else {
log(1, "(sac) (warning) message with mid: ", mid,
" unknown, discarding.");
}
return false;
}
// parse link identifiers from list and for each one forward the
// message to the subscribed users
bool event_service::link_detected_indication(meta_message_ptr &in,
meta_message_ptr &out)
{
// if(in->payload().size() == 0)
// return false;
log(1, "(mies) received Link_Detected.indication from ",
in->source().to_string());
// link detected info from incoming message
mih::link_det_info_list list_ids;
// link detected info on outgoing message
mih::link_det_info_list list_rsp;
mih::link_det_info_list::iterator it;
*in >> mih::response()
& mih::tlv_link_det_info_list(list_ids);
for(it = list_ids.begin(); it != list_ids.end(); it++) {
// construct new link detected indication message
// with just the link detected in the payload
list_rsp.push_back(*it);
*out << mih::indication(mih::indication::link_detected)
& mih::tlv_link_det_info_list(list_rsp);
// forward message to subscribed users
msg_forward(out, it->id, mih::link_detected);
list_rsp.clear();
// FIXME: clear out before continuing
}
return false;
}
/**
* Run Acknowledge Responder State Machine transaction.
*/
void ack_responder()
{
switch(ack_rsp_state)
{
case ACK_RSP_INIT:
goto _rsp_init_lbl_;
case ACK_RSP_RETURN_ACK:
goto _rsp_return_ack_lbl_;
case ACK_RSP_PIGGYBACKING:
goto _rsp_piggybacking_lbl_;
case ACK_RSP_RETURN_DUPLICATE:
goto _rsp_return_duplicate_lbl_;
}
_rsp_init_lbl_:
{
ack->ackreq(false);
ack->ackrsp(true);
ack->opcode((mih::operation::type)opcode);
ack->tid(tid);
ack->mid(in->mid());
ack->source(my_mihf_id);
ack->destination(peer_mihf_id);
ack->ip(in->ip());
ack->port(in->port());
if (msg_out_avail)
goto _rsp_piggybacking_lbl_;
else
{
_netsap.send(ack);
msg_in_avail = false;
goto _rsp_return_ack_lbl_;
}
return;
}
_rsp_return_ack_lbl_:
{
ack_rsp_state = ACK_RSP_RETURN_ACK;
if(msg_in_avail)
{
_netsap.send(ack);
msg_in_avail = false;
}
else if (msg_out_avail)
goto _rsp_piggybacking_lbl_;
return;
}
_rsp_piggybacking_lbl_:
{
ack_rsp_state = ACK_RSP_PIGGYBACKING;
out->ackrsp(true);
dup = out;
if (msg_in_avail)
goto _rsp_return_duplicate_lbl_;
return;
}
_rsp_return_duplicate_lbl_:
{
ack_rsp_state = ACK_RSP_RETURN_DUPLICATE;
if (msg_in_avail) {
_netsap.send(dup);
msg_in_avail = false;
}
}
}
