/*
* Summary: Handles (r)esult packet reflex. Packet information is logged and
* result is logged for the specific calculation.
* Parameters: (r)esult packet.
* Return: None.
*/
void
r_handler(u8 * packet)
{
R_PKT PKT_R;
if (packetScanf(packet, "%Zr%z\n", R_ZScanner, &PKT_R) != 3)
{
logNormal("r_handler: Failed at %d\n", packetCursor(packet));
return; // No harm done so no blinkcoding necessary
}
u32 NODE_INDEX; // index holder for if log is valid
// only log properly formatted packets
if (INVALID == (NODE_INDEX = log(PKT_R.key.ID, PKT_R.key.TIME)))
return; // Don't continue if this packet has been received before
// Handle packet spammers
else if (PC_NODE_ARR[NODE_INDEX] > (PKT_R.key.TIME / 1000))
{
// Decrease the amount of pings recorded; "spammer amnesty" of sorts.
PC_NODE_ARR[NODE_INDEX] -= 2;
return; // Don't continue if this IXM is spamming packets right now.
}
else if (PKT_R.calc_ver < HOST_CALC_VER)
return; // Don't continue if this is an old calculation version
else if (0xffffffff == PKT_R.calc_ver)
logNormal("Calculation version overflow.\n");
if (PKT_R.neighbor)
{ // If this a neighboring node
PKT_R.neighbor = 0; // Reset the flag before forwarding
NEIGHBORS_ARR[packetSource(packet)] = PKT_R.key.ID; // And remember the ID
}
// If all the hoops have been jumped through
FWD_R_PKT(&PKT_R, packetSource(packet)); // Forward the packet
if (PKT_R.calc_ver == HOST_CALC_VER) // Same result?
// Update the results from packets with proper calculation versions
voteCount(NODE_INDEX, PKT_R.rslt);
else if (PKT_R.calc_ver > HOST_CALC_VER) // New calculation version?
{ // perform standard procedures
strikeCheck(); // evaluate the strikes for my neighbors
flush(); // clear out my records for the new voting session
voteCount(NODE_INDEX, PKT_R.rslt); // Remember the node's vote
HOST_CALC = PKT_R.calc; // Remember the new calculation
HOST_CALC_VER = PKT_R.calc_ver; // Remember the new calculation version
voteCount(0, calculate(HOST_CALC)); // calculation occurs here
}
return;
}
/*
* Summary: Sets a table-printing alarm that will reset itself on interval.
* Parameters: (t)able packet.
* Return: None.
*/
void
t_handler(u8 * packet)
{
TERMINAL_FACE = packetSource(packet); // remember where this request came from
Alarms.set(Alarms.create(printTable), millis()); // schedule the first table
return;
}
boolean PingClient::havePacket()
{
ICMPv6Packet& packet = (ICMPv6Packet&)_ether.packet();
if (!_ether.bufferContainsReceived()) {
return false;
}
if (packet.protocol() != IP6_PROTO_ICMP6) {
// Wrong protocol
return false;
}
if (packet.type != ICMP6_TYPE_ECHO_REPLY) {
// Wrong ICMPv6 type
return false;
}
if (!_ether.isOurAddress(packetDestination())) {
// Wrong destination address
return false;
}
if (!_remoteAddress.isZero() && packetSource() != _remoteAddress) {
// Wrong source address
return false;
}
if (ntohs(packet.echo.identifier) != this->_identifier) {
// Wrong ICMPv6 Echo identifier
return false;
}
if (ntohs(packet.echo.sequenceNumber) != lastSequenceNumber()) {
// Sequence numbers didn't match
return false;
}
// Everthing matched up
this->_gotReply = true;
this->_timeLastRecieved = micros();
return true;
}
/*
* Summary: Handles (c)alculation packet reflex. Packet information is saved
* and converted into a R packet to be forwarded to neighboring nodes.
* Parameters: (c)alculation packet.
* Return: None.
*/
void
c_handler(u8 * packet)
{
C_PKT PKT_R;
if (packetScanf(packet, "%Zc%z\n", C_ZScanner, &PKT_R) != 3)
{
logNormal("c_handler: Failed at %d\n", packetCursor(packet));
return;
}
if (PKT_R.calc < 0)
{
logNormal("c_handler: Input %d must be a non-negative integer.\n",
PKT_R.calc);
return;
}
if (PKT_R.calc > PRIME_THRESHOLD)
{
logNormal("c_handler: Value %d is higher than the threshold %d (%d).\n",
PKT_R.calc, PRIME_THRESHOLD, PRIME_ARR_THRESHOLD - 1);
return;
}
strikeCheck(); // evaluate the strikes for my neighbors
flush(); // clear out my records for the new voting session
R_PKT PKT_T; // synthesize a new packet
++HOST_CALC_VER;
HOST_CALC = PKT_R.calc;
PKT_T.key.ID = ID_HOST;
PKT_T.key.TIME = millis();
PKT_T.calc = HOST_CALC;
PKT_T.calc_ver = HOST_CALC_VER;
PKT_T.rslt = VOTE_NODE_ARR[0];
// If all the hoops have been jumped through
FWD_R_PKT(&PKT_T, packetSource(packet)); // Forward the packet
voteCount(0, calculate(HOST_CALC)); // calculation occurs here
return;
}