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Cleaned bunch of stuff. Only the actual data transmission is left to do.

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irungentoo 2013-06-29 11:14:33 -04:00
parent c9d0c208a5
commit d86a39ebfd
2 changed files with 246 additions and 139 deletions
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377
core/Lossless_UDP.c
View File

@ -3,10 +3,10 @@
* An implementation of the Lossless_UDP protocol as seen in docs/Lossless_UDP.txt
*
*/
#include "Lossless_UDP.h"
//maximum data packets in sent and recieve queues.
//maximum data packets in sent and recieve queues.
#define MAX_QUEUE_NUM 32
//maximum length of the data in the data packets
@ -18,6 +18,12 @@
//Lossless UDP connection timeout.
#define CONNEXION_TIMEOUT 10
//initial amount of sync/hanshake packets to send per second.
#define SYNC_RATE 5
//send rate of sync packets when data is being sent/recieved.
#define DATA_SYNC_RATE 20
typedef struct
{
char data[PDATA_SIZE];
@ -37,18 +43,23 @@ typedef struct
uint16_t SYNC_rate;//current SYNC packet send rate packets per second.
uint16_t data_rate;//current data packet send rate packets per second.
uint64_t last_SYNC; //time at which our last SYNC packet was sent.
uint64_t last_sent; //time at which our last data or handshake packet was sent.
uint64_t last_recv; //time at which we last recieved something from the other
uint16_t SYNC_packetsize;
char SYNC_packet[(MAX_PACKET_NUM*4 + 4 + 4 + 3)]; //the SYNC packet itself
Data sendbuffer[MAX_PACKET_NUM];//packet send buffer.
Data recvbuffer[MAX_PACKET_NUM];//packet recieve buffer.
Data sendbuffer[MAX_QUEUE_NUM];//packet send buffer.
Data recvbuffer[MAX_QUEUE_NUM];//packet recieve buffer.
uint32_t handshake_id1;
uint32_t handshake_id2;
uint32_t recv_packetnum; //number of data packets recieved (also used as handshake_id1)
uint32_t orecv_packetnum; //number of packets recieved by the other peer
uint32_t sent_packetnum; //number of data packets sent
uint32_t osent_packetnum; //number of packets sent by the other peer.
uint32_t sendbuff_packetnum; //number of latest packet written onto the sendbuffer
uint32_t successful_sent;//we know all packets before that number were successfully sent
uint32_t successful_read;//packet number of last packet read with the read_packet function
uint32_t req_packets[MAX_PACKET_NUM]; //list of currently requested packet numbers.
uint16_t num_req_paquets; //total number of currently requested packets
uint8_t counter;
uint32_t req_packets[MAX_PACKET_NUM]; //list of currently requested packet numbers(by the other person)
uint16_t num_req_paquets; //total number of currently requested packets(by the other person)
uint8_t recv_counter;
uint8_t send_counter;
}Connection;
@ -56,7 +67,6 @@ typedef struct
Connection connections[MAX_CONNECTIONS];
//Functions
//initialize a new connection to ip_port
@ -69,9 +79,37 @@ int new_connection(IP_Port ip_port)
{
if(connections[i].status == 0)
{
connections[i].ip_port = ip_port;
connections[i].status = 1;
connections[i].inbound = 0;
connections[i].recv_packetnum = random_int(); //handshake_id1
connections[i].handshake_id1 = random_int();
connections[i].SYNC_rate = SYNC_RATE;
connections[i].data_rate = DATA_SYNC_RATE;
connections[i].last_recv = current_time();
connections[i].send_counter = 0;
return i;
}
}
return -1;
}
//initialize a new inbound connection from ip_port
//returns an integer corresponding to the connection id.
//return -1 if it could not initialize the connection.
int new_inconnection(IP_Port ip_port)
{
uint32_t i;
for(i = 0; i < MAX_CONNECTIONS; i++)
{
if(connections[i].status == 0)
{
connections[i].ip_port = ip_port;
connections[i].status = 2;
connections[i].inbound = 2;
connections[i].SYNC_rate = SYNC_RATE;
connections[i].data_rate = DATA_SYNC_RATE;
connections[i].last_recv = current_time();
connections[i].send_counter = 127;
return i;
}
}
@ -110,16 +148,7 @@ int kill_connection(int connection_id)
//return length of received packet if successful
int read_packet(int connection_id, char * data)
{
//NOTE: like this to handle overflow
if(connections[connection_id].recv_packetnum - connections[connection_id].successful_read < MAX_QUEUE_NUM &&
connections[connection_id].recv_packetnum - connections[connection_id].successful_read != 0)
{
uint16_t index = (connections[connection_id].successful_read % MAX_QUEUE_NUM);
memcpy(data, connections[connection_id].sendbuffer[index].data,
connections[connection_id].sendbuffer[index].size);
connections[connection_id].successful_read++;
return connections[connection_id].sendbuffer[index].size;
}
return 0;
}
@ -127,21 +156,17 @@ int read_packet(int connection_id, char * data)
//return 1 if data was put into the queue
int write_packet(int connection_id, char * data, uint32_t length)
{
//NOTE: like this to handle overflow
if(connections[connection_id].sent_packetnum - connections[connection_id].successful_sent < MAX_QUEUE_NUM)
{
uint16_t index = (connections[connection_id].successful_sent % MAX_QUEUE_NUM);
memcpy(connections[connection_id].sendbuffer[index].data, data, length);
connections[connection_id].sendbuffer[index].size = length;
return 1;
}
return 0;
}
//returns the number of packets in the queue waiting to be successfully sent.
int sendqueue(int connection_id)
{
return connections[connection_id].sent_packetnum - connections[connection_id].successful_sent;
return connections[connection_id].sendbuff_packetnum - connections[connection_id].successful_sent;
}
//returns the number of packets in the queue waiting to be successfully read with read_packet(...)
@ -160,42 +185,23 @@ int is_connected(int connection_id)
return connections[connection_id].status;
}
//add a packet number to the list of packet numbers we are requesting
//return 0 if added successfully
//return 1 if it did not because the list was full (should never ever happen)
int request_packet(int connection_id, uint32_t number)
{
if(connections[connection_id].num_req_paquets >= MAX_PACKET_NUM)
{
connections[connection_id].req_packets[connections[connection_id].num_req_paquets] = number;
connections[connection_id].num_req_paquets++;
return 0;
}
return 1;
}
//remove a packet number from the list of packet numbers we are requesting
//return 0 if removed successfully
//return 1 if it did not because it was not in the list.
int unrequest_packet(int connection_id, uint32_t number)
//put the packet numbers the we are missing in requested and return the number
uint32_t missing_packets(int connection_id, uint32_t * requested)
{
uint32_t number = 0;
uint32_t i;
for(i = 0; i < connections[connection_id].num_req_paquets; i++)
for(i = connections[connection_id].recv_packetnum; i != connections[connection_id].osent_packetnum; i++ )
{
if(connections[connection_id].req_packets[i] == number)
if(connections[connection_id].recvbuffer[i % MAX_QUEUE_NUM].size == 0)
{
connections[connection_id].num_req_paquets--;
connections[connection_id].req_packets[i] =
connections[connection_id].req_packets[connections[connection_id].num_req_paquets];
return 0;
memcpy(requested, &i, number);
number++;
}
}
return 1;
return number;
}
//Packet sending functions
//One per packet type.
//see docs/Lossless_UDP.txt for more information.
@ -212,19 +218,21 @@ int send_handshake(IP_Port ip_port, uint32_t handshake_id1, uint32_t handshake_i
}
int send_SYNC(IP_Port ip_port, char type, uint8_t counter, uint32_t recv_packetnum,
uint32_t sent_packetnum, uint32_t * requested, uint32_t number)
int send_SYNC(uint32_t connection_id)
{
if(number > MAX_PACKET_NUM)
{
return -1;
}
char packet[(MAX_PACKET_NUM*4 + 4 + 4 + 3)];
char packet[(MAX_PACKET_NUM*4 + 4 + 4 + 2)];
uint16_t index = 0;
IP_Port ip_port = connections[connection_id].ip_port;
uint8_t counter = connections[connection_id].send_counter;
uint32_t recv_packetnum = connections[connection_id].recv_packetnum;
uint32_t sent_packetnum = connections[connection_id].sent_packetnum;
uint32_t requested[MAX_PACKET_NUM];
uint32_t number = missing_packets(connection_id, requested);
packet[0] = 17;
packet[1] = type;
index += 2;
index += 1;
memcpy(packet + index, &counter, 1);
index += 1;
memcpy(packet + index, &recv_packetnum, 4);
@ -233,7 +241,7 @@ int send_SYNC(IP_Port ip_port, char type, uint8_t counter, uint32_t recv_packetn
index += 4;
memcpy(packet + index, requested, 4 * number);
return sendpacket(ip_port, packet, (number*4 + 4 + 4 + 3));
return sendpacket(ip_port, packet, (number*4 + 4 + 4 + 2));
}
@ -257,7 +265,7 @@ int send_data(IP_Port ip_port, uint32_t packet_num, char * data, uint32_t length
//get connection id from IP_Port
//return -1 if there are no connections like we are looking for
//return id
//return id if it found it
int getconnection_id(IP_Port ip_port)
{
uint32_t i;
@ -307,103 +315,145 @@ int handle_handshake(char * packet, uint32_t length, IP_Port source)
return 1;
}
uint32_t handshake_id1, handshake_id2;
memcpy(&handshake_id1, packet + 1, length);
memcpy(&handshake_id2, packet + 5, length);
memcpy(&handshake_id1, packet + 1, 4);
memcpy(&handshake_id2, packet + 5, 4);
if(handshake_id2 == 0)
{
send_handshake(source, handshake_id1, handshake_id(source));
return 0;
}
int connection = getconnection_id(source);
if(connection != 1)
if(is_connected(connection) != 1)
{
return 0;
return 1;
}
if(handshake_id1 == connections[connection].recv_packetnum)//if handshake_id1 is what we sent previously.
if(handshake_id1 == connections[connection].handshake_id1)//if handshake_id1 is what we sent previously.
{
connections[connection].status = 2;
//NOTE:is this necessary?
//connections[connection].handshake_id2 = handshake_id2;
connections[connection].orecv_packetnum = handshake_id1;
connections[connection].sent_packetnum = handshake_id1;
connections[connection].osent_packetnum = handshake_id2;
connections[connection].recv_packetnum = handshake_id2;
}
return 0;
}
handle_SYNC(char * packet, uint32_t length, IP_Port source)
//returns 1 if sync packet is valid
//0 if not.
int SYNC_valid(uint32_t length)
{
if(length < 4 + 4 + 3)
if(length < 4 + 4 + 2)
{
return 1;
return 0;
}
if(length > (MAX_PACKET_NUM*4 + 4 + 4 + 3) ||
((length - 4 - 4 - 3) % 4) != 0)
if(length > (MAX_PACKET_NUM*4 + 4 + 4 + 2) ||
((length - 4 - 4 - 2) % 4) != 0)
{
return 1;
return 0;
}
uint32_t reqpackets[MAX_PACKET_NUM];
int connection = getconnection_id(source);
char type;
uint8_t counter;
uint32_t recv_packetnum, sent_packetnum;
uint32_t requested[MAX_PACKET_NUM];
int16_t index = 2;
memcpy(&counter, packet + index, 1);
index += 1;
memcpy(&recv_packetnum, packet + index, 4);
index += 4;
memcpy(&sent_packetnum,packet + index, 4);
index += 4;
//memcpy(requested, packet + index, 4 * number);
if(connection == -1) //we are not connected to the person who sent us that packet
{
if(handshake_id(source) == recv_packetnum)
{
//TODO: handle new inbound connection
}
else
{
return 1;
}
}
if(connections[connection].status == 2) //we have just recieved our first SYNC packet from the other.
{
if(connections[connection].recv_packetnum == recv_packetnum &&
connections[connection].sent_packetnum == sent_packetnum)
{
connections[connection].status = 3;
connections[connection].counter = counter + 1;
connections[connection].last_recv = current_time();
}
}
if(connections[connection].status == 3) //we are connected and the other person just sent us a SYNC packet
{
//TODO: finish this function.
}
return 1;
}
//case 1:
int handle_SYNC1(IP_Port source, uint32_t recv_packetnum, uint32_t sent_packetnum)
{
if(handshake_id(source) == recv_packetnum)
{
int x = new_inconnection(source);
if(x != -1)
{
connections[x].orecv_packetnum = recv_packetnum;
connections[x].sent_packetnum = recv_packetnum;
connections[x].osent_packetnum = sent_packetnum;
connections[x].recv_packetnum = sent_packetnum;
handle_data(char * packet, uint32_t length, IP_Port source)
return x;
}
}
return -1;
}
//case 2:
int handle_SYNC2(int connection_id, uint8_t counter, uint32_t recv_packetnum, uint32_t sent_packetnum)
{
if(recv_packetnum == connections[connection_id].orecv_packetnum &&
sent_packetnum == connections[connection_id].osent_packetnum)
{
connections[connection_id].status = 3;
connections[connection_id].recv_counter = counter;
connections[connection_id].send_counter++;
return 0;
}
}
//case 3:
int handle_SYNC3(int connection_id, uint8_t counter, uint32_t recv_packetnum, uint32_t sent_packetnum, uint32_t * req_packets,
uint16_t number)
{
uint8_t comp_counter = (connections[connection_id].recv_counter + 1);
if((recv_packetnum - connections[connection_id].orecv_packetnum) < MAX_PACKET_NUM &&
(sent_packetnum - connections[connection_id].osent_packetnum) < MAX_PACKET_NUM &&
counter == comp_counter) //packet valid
{
connections[connection_id].orecv_packetnum = recv_packetnum;
connections[connection_id].osent_packetnum = sent_packetnum;
connections[connection_id].last_recv = current_time();
connections[connection_id].recv_counter = counter;
connections[connection_id].send_counter++;
memcpy(connections[connection_id].req_packets, req_packets, 4 * number);
connections[connection_id].num_req_paquets = number;
return 0;
}
return 1;
}
int handle_SYNC(char * packet, uint32_t length, IP_Port source)
{
if(!SYNC_valid(length))
{
return 1;
}
int connection = getconnection_id(source);
uint8_t counter;
uint32_t recv_packetnum, sent_packetnum;
uint32_t req_packets[MAX_PACKET_NUM];
uint16_t number = (length - 4 - 4 - 2)/ 4;
memcpy(&counter, packet + 1, 1);
memcpy(&recv_packetnum, packet + 2, 4);
memcpy(&sent_packetnum,packet + 6, 4);
if(number != 0)
{
memcpy(req_packets, packet + 10, 4 * number);
}
if(connection == -1)
{
handle_SYNC1(source, recv_packetnum, sent_packetnum);
return 0;
}
if(connections[connection].status == 2)
{
handle_SYNC2(connection, counter, recv_packetnum, sent_packetnum);
return 0;
}
if(connections[connection].status == 3)
{
handle_SYNC3(connection, counter, recv_packetnum, sent_packetnum, req_packets, number);
}
return 0;
}
int handle_data(char * packet, uint32_t length, IP_Port source)
{
}
//END of packet handling functions
//if we receive a Lossless_UDP packet we call this function so it can be handled.
//Return 0 if packet is handled correctly.
//return 1 if it didn't handle the packet or if the packet was shit.
int LosslessUDP_handlepacket(char * packet, uint32_t length, IP_Port source)
{
@ -426,11 +476,70 @@ int LosslessUDP_handlepacket(char * packet, uint32_t length, IP_Port source)
}
//Send handshake requests
//TODO: optimize this.
//handshake packets are sent at the same rate as SYNC packets
void doNew()
{
uint32_t i;
uint64_t temp_time = current_time();
for(i = 0; i < MAX_CONNECTIONS; i++)
{
if(connections[i].status == 1)
{
if((connections[i].last_sent + (1000000UL/connections[i].SYNC_rate)) <= temp_time)
{
send_handshake(connections[i].ip_port, connections[i].handshake_id1, 0);
connections[i].last_sent = temp_time;
}
}
//kill all timed out connections
if( connections[i].status > 0 && (connections[i].last_recv + CONNEXION_TIMEOUT * 1000000UL) < temp_time)
{
kill_connection(i);
}
}
}
void doSYNC()
{
uint32_t i;
uint64_t temp_time = current_time();
for(i = 0; i < MAX_CONNECTIONS; i++)
{
if(connections[i].status == 2 || connections[i].status == 3)
{
if((connections[i].last_SYNC + (1000000UL/connections[i].SYNC_rate)) <= temp_time)
{
send_SYNC(i);
connections[i].last_SYNC = temp_time;
}
}
}
}
void doData()
{
}
//TODO: flow control.
//automatically adjusts send rates of packets for optimal transmission.
void adjustRates()
{
//if()
}
//Call this function a couple times per second
//It's the main loop.
void doLossless_UDP()
{
doNew();
doSYNC();
doData();
adjustRates();
}

2
core/Lossless_UDP.h
View File

@ -9,8 +9,6 @@
#include "network.h"
//Functions
//initialize a new connection to ip_port