mirror of
https://github.com/irungentoo/toxcore.git
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Merge pull request #249 from rlt3/master
Re-styling Lossless_UDP.c and .h
This commit is contained in:
irungentoo
commit
e3c47d90b9
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@ -21,67 +21,95 @@
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*
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*/
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/* TODO: clean this file a bit.
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There are a couple of useless variables to get rid of. */
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/*
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* TODO: clean this file a bit.
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* There are a couple of useless variables to get rid of.
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*/
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#include "Lossless_UDP.h"
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/* maximum data packets in sent and receive queues. */
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#define MAX_QUEUE_NUM 16
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/* maximum length of the data in the data packets */
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/* #define MAX_DATA_SIZE 1024 */ /* defined in Lossless_UDP.h */
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#define MAX_QUEUE_NUM 16
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/* maximum number of data packets in the buffer */
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#define BUFFER_PACKET_NUM (16-1)
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/* Lossless UDP connection timeout.
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timeout per connection is randomly set between CONNEXION_TIMEOUT and 2*CONNEXION_TIMEOUT */
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/* timeout per connection is randomly set between CONNEXION_TIMEOUT and 2*CONNEXION_TIMEOUT */
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#define CONNEXION_TIMEOUT 5
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/* initial amount of sync/hanshake packets to send per second. */
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#define SYNC_RATE 2
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#define SYNC_RATE 2
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/* initial send rate of data. */
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#define DATA_SYNC_RATE 30
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#define DATA_SYNC_RATE 30
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typedef struct {
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uint8_t data[MAX_DATA_SIZE];
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uint8_t data[MAX_DATA_SIZE];
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uint16_t size;
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} Data;
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typedef struct {
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IP_Port ip_port;
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uint8_t status; /* 0 if connection is dead, 1 if attempting handshake,
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2 if handshake is done (we start sending SYNC packets)
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3 if we are sending SYNC packets and can send data
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4 if the connection has timed out. */
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uint8_t inbound; /* 1 or 2 if connection was initiated by someone else, 0 if not.
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2 if incoming_connection() has not returned it yet, 1 if it has. */
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/*
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* 0 if connection is dead, 1 if attempting handshake,
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* 2 if handshake is done (we start sending SYNC packets)
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* 3 if we are sending SYNC packets and can send data
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* 4 if the connection has timed out.
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*/
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uint8_t status;
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uint16_t SYNC_rate; /* current SYNC packet send rate packets per second. */
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uint16_t data_rate; /* current data packet send rate packets per second. */
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uint64_t last_SYNC; /* time at which our last SYNC packet was sent. */
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uint64_t last_sent; /* time at which our last data or handshake packet was sent. */
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uint64_t last_recvSYNC; /* time at which we last received a SYNC packet from the other */
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uint64_t last_recvdata; /* time at which we last received a DATA packet from the other */
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uint64_t killat; /* time at which to kill the connection */
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Data sendbuffer[MAX_QUEUE_NUM]; /* packet send buffer. */
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Data recvbuffer[MAX_QUEUE_NUM]; /* packet receive buffer. */
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uint32_t handshake_id1;
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uint32_t handshake_id2;
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uint32_t recv_packetnum; /* number of data packets received (also used as handshake_id1) */
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uint32_t orecv_packetnum; /* number of packets received by the other peer */
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uint32_t sent_packetnum; /* number of data packets sent */
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uint32_t osent_packetnum; /* number of packets sent by the other peer. */
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uint32_t sendbuff_packetnum; /* number of latest packet written onto the sendbuffer */
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uint32_t successful_sent; /* we know all packets before that number were successfully sent */
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uint32_t successful_read; /* packet number of last packet read with the read_packet function */
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uint32_t req_packets[BUFFER_PACKET_NUM]; /* list of currently requested packet numbers(by the other person) */
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uint16_t num_req_paquets; /* total number of currently requested packets(by the other person) */
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uint8_t recv_counter;
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uint8_t send_counter;
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uint8_t timeout; /* connection timeout in seconds. */
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/*
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* 1 or 2 if connection was initiated by someone else, 0 if not.
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* 2 if incoming_connection() has not returned it yet, 1 if it has.
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*/
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uint8_t inbound;
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uint16_t SYNC_rate; /* current SYNC packet send rate packets per second. */
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uint16_t data_rate; /* current data packet send rate packets per second. */
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uint64_t last_SYNC; /* time our last SYNC packet was sent. */
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uint64_t last_sent; /* time our last data or handshake packet was sent. */
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uint64_t last_recvSYNC; /* time we last received a SYNC packet from the other */
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uint64_t last_recvdata; /* time we last received a DATA packet from the other */
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uint64_t killat; /* time to kill the connection */
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Data sendbuffer[MAX_QUEUE_NUM]; /* packet send buffer. */
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Data recvbuffer[MAX_QUEUE_NUM]; /* packet receive buffer. */
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uint32_t handshake_id1;
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uint32_t handshake_id2;
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/* number of data packets received (also used as handshake_id1) */
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uint32_t recv_packetnum;
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/* number of packets received by the other peer */
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uint32_t orecv_packetnum;
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/* number of data packets sent */
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uint32_t sent_packetnum;
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/* number of packets sent by the other peer. */
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uint32_t osent_packetnum;
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/* number of latest packet written onto the sendbuffer */
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uint32_t sendbuff_packetnum;
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/* we know all packets before that number were successfully sent */
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uint32_t successful_sent;
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/* packet number of last packet read with the read_packet function */
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uint32_t successful_read;
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/* list of currently requested packet numbers(by the other person) */
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uint32_t req_packets[BUFFER_PACKET_NUM];
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/* total number of currently requested packets(by the other person) */
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uint16_t num_req_paquets;
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uint8_t recv_counter;
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uint8_t send_counter;
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uint8_t timeout; /* connection timeout in seconds. */
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} Connection;
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@ -94,26 +122,33 @@ static uint32_t connections_number; /* Number of connections in connections arra
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/* Functions */
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/* get connection id from IP_Port
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return -1 if there are no connections like we are looking for
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return id if it found it */
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/*
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* Get connection id from IP_Port
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* Return -1 if there are no connections like we are looking for
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* Return id if it found it
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*/
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int getconnection_id(IP_Port ip_port)
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{
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uint32_t i;
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for (i = 0; i < MAX_CONNECTIONS; ++i) {
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if (connections[i].ip_port.ip.i == ip_port.ip.i &&
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connections[i].ip_port.port == ip_port.port && connections[i].status > 0)
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connections[i].ip_port.port == ip_port.port &&
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connections[i].status > 0)
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return i;
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}
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return -1;
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}
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/* table of random numbers used below. */
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static uint32_t randtable[6][256];
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/* generate a handshake_id which depends on the ip_port.
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this function will always give one unique handshake_id per ip_port.
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TODO: make this better */
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/*
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* Generate a handshake_id which depends on the ip_port.
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* This function will always give one unique handshake_id per ip_port.
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*
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* TODO: make this better
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*/
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uint32_t handshake_id(IP_Port source)
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{
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uint32_t id = 0, i;
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@ -124,21 +159,27 @@ uint32_t handshake_id(IP_Port source)
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}
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if (id == 0) /* id can't be zero */
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id = 1;
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return id;
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}
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/* change the hnshake id associated with that ip_port
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TODO: make this better */
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/*
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* Change the hanshake id associated with that ip_port
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*
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* TODO: make this better
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*/
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void change_handshake(IP_Port source)
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{
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uint8_t rand = random_int() % 4;
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randtable[rand][((uint8_t *)&source)[rand]] = random_int();
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}
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/* initialize a new connection to ip_port
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returns an integer corresponding to the connection id.
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return -1 if it could not initialize the connection.
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if there already was an existing connection to that ip_port return its number. */
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/*
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* Initialize a new connection to ip_port
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* Returns an integer corresponding to the connection idt
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* Return -1 if it could not initialize the connectiont
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* If there already was an existing connection to that ip_port return its number.
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*/
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int new_connection(IP_Port ip_port)
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{
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int connect = getconnection_id(ip_port);
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@ -148,8 +189,10 @@ int new_connection(IP_Port ip_port)
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if(connections_number == connections_length) {
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Connection * temp;
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temp = realloc(connections, sizeof(Connection) * (connections_length + 1));
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if(temp == NULL)
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return -1;
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memset(&temp[connections_length], 0, sizeof(Connection));
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++connections_length;
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connections = temp;
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@ -159,31 +202,37 @@ int new_connection(IP_Port ip_port)
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for (i = 0; i < MAX_CONNECTIONS; ++i) {
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if(connections[i].status == 0) {
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memset(&connections[i], 0, sizeof(Connection));
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connections[i].ip_port = ip_port;
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connections[i].status = 1;
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connections[i].inbound = 0;
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connections[i].handshake_id1 = handshake_id(ip_port);
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connections[i].sent_packetnum = connections[i].handshake_id1;
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connections[i].sendbuff_packetnum = connections[i].handshake_id1;
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connections[i].successful_sent = connections[i].handshake_id1;
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connections[i].SYNC_rate = SYNC_RATE;
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connections[i].data_rate = DATA_SYNC_RATE;
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connections[i].last_recvSYNC = current_time();
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connections[i].last_sent = current_time();
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connections[i].killat = ~0;
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connections[i].send_counter = 0;
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/* add randomness to timeout to prevent connections getting stuck in a loop. */
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connections[i].timeout = CONNEXION_TIMEOUT + rand() % CONNEXION_TIMEOUT;
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connections[i] = (Connection) {
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.ip_port = ip_port,
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.status = 1,
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.inbound = 0,
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.handshake_id1 = handshake_id(ip_port),
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.sent_packetnum = connections[i].handshake_id1,
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.sendbuff_packetnum = connections[i].handshake_id1,
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.successful_sent = connections[i].handshake_id1,
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.SYNC_rate = SYNC_RATE,
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.data_rate = DATA_SYNC_RATE,
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.last_recvSYNC = current_time(),
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.last_sent = current_time(),
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.killat = ~0,
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.send_counter = 0,
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/* add randomness to timeout to prevent connections getting stuck in a loop. */
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.timeout = CONNEXION_TIMEOUT + rand() % CONNEXION_TIMEOUT
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};
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++connections_number;
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return i;
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}
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}
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return -1;
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}
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/* initialize a new inbound connection from ip_port
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returns an integer corresponding to the connection id.
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return -1 if it could not initialize the connection. */
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/*
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* Initialize a new inbound connection from ip_port
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* Returns an integer corresponding to the connection id.
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* Return -1 if it could not initialize the connection.
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*/
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int new_inconnection(IP_Port ip_port)
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{
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if (getconnection_id(ip_port) != -1)
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@ -192,8 +241,10 @@ int new_inconnection(IP_Port ip_port)
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if(connections_number == connections_length) {
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Connection * temp;
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temp = realloc(connections, sizeof(Connection) * (connections_length + 1));
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if(temp == NULL)
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return -1;
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memset(&temp[connections_length], 0, sizeof(Connection));
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++connections_length;
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connections = temp;
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@ -203,18 +254,23 @@ int new_inconnection(IP_Port ip_port)
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for (i = 0; i < MAX_CONNECTIONS; ++i) {
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if (connections[i].status == 0) {
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memset(&connections[i], 0, sizeof(Connection));
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connections[i].ip_port = ip_port;
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connections[i].status = 2;
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connections[i].inbound = 2;
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connections[i].SYNC_rate = SYNC_RATE;
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connections[i].data_rate = DATA_SYNC_RATE;
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connections[i].last_recvSYNC = current_time();
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connections[i].last_sent = current_time();
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/* add randomness to timeout to prevent connections getting stuck in a loop. */
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connections[i].timeout = CONNEXION_TIMEOUT + rand() % CONNEXION_TIMEOUT;
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/* if this connection isn't handled within the timeout kill it. */
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connections[i].killat = current_time() + 1000000UL*connections[i].timeout;
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connections[i].send_counter = 127;
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connections[i] = (Connection){
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.ip_port = ip_port,
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.status = 2,
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.inbound = 2,
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.SYNC_rate = SYNC_RATE,
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.data_rate = DATA_SYNC_RATE,
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.last_recvSYNC = current_time(),
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.last_sent = current_time(),
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.send_counter = 127,
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/* add randomness to timeout to prevent connections getting stuck in a loop. */
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.timeout = CONNEXION_TIMEOUT + rand() % CONNEXION_TIMEOUT,
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/* if this connection isn't handled within the timeout kill it. */
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.killat = current_time() + 1000000UL*connections[i].timeout
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};
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++connections_number;
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return i;
|
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}
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|
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@ -222,8 +278,10 @@ int new_inconnection(IP_Port ip_port)
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return -1;
|
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}
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/* returns an integer corresponding to the next connection in our incoming connection list
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return -1 if there are no new incoming connections in the list. */
|
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/*
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* Returns an integer corresponding to the next connection in our incoming connection list.
|
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* Return -1 if there are no new incoming connections in the list.
|
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*/
|
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int incoming_connection()
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{
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uint32_t i;
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|
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@ -233,9 +291,11 @@ int incoming_connection()
|
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return i;
|
||||
}
|
||||
}
|
||||
|
||||
return -1;
|
||||
}
|
||||
/*Try to free some memory from the connections array.*/
|
||||
|
||||
/* Try to free some memory from the connections array. */
|
||||
static void free_connections()
|
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{
|
||||
uint32_t i;
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||||
|
|
@ -245,16 +305,20 @@ static void free_connections()
|
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|
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if(connections_length == i)
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return;
|
||||
|
||||
Connection * temp;
|
||||
temp = realloc(connections, sizeof(Connection) * i);
|
||||
if(temp == NULL && i != 0)
|
||||
return;
|
||||
|
||||
connections = temp;
|
||||
connections_length = i;
|
||||
}
|
||||
|
||||
/* return -1 if it could not kill the connection.
|
||||
return 0 if killed successfully */
|
||||
/*
|
||||
* Return -1 if it could not kill the connection.
|
||||
* Return 0 if killed successfully
|
||||
*/
|
||||
int kill_connection(int connection_id)
|
||||
{
|
||||
if (connection_id >= 0 && connection_id < MAX_CONNECTIONS) {
|
||||
|
|
@ -269,9 +333,11 @@ int kill_connection(int connection_id)
|
|||
return -1;
|
||||
}
|
||||
|
||||
/* kill connection in seconds seconds.
|
||||
return -1 if it can not kill the connection.
|
||||
return 0 if it will kill it */
|
||||
/*
|
||||
* Kill connection in seconds.
|
||||
* Return -1 if it can not kill the connection.
|
||||
* Return 0 if it will kill it.
|
||||
*/
|
||||
int kill_connection_in(int connection_id, uint32_t seconds)
|
||||
{
|
||||
if (connection_id >= 0 && connection_id < MAX_CONNECTIONS) {
|
||||
|
|
@ -283,12 +349,14 @@ int kill_connection_in(int connection_id, uint32_t seconds)
|
|||
return -1;
|
||||
}
|
||||
|
||||
/* check if connection is connected
|
||||
return 0 no.
|
||||
return 1 if attempting handshake
|
||||
return 2 if handshake is done
|
||||
return 3 if fully connected
|
||||
return 4 if timed out and waiting to be killed */
|
||||
/*
|
||||
* Check if connection is connected:
|
||||
* Return 0 no.
|
||||
* Return 1 if attempting handshake.
|
||||
* Return 2 if handshake is done.
|
||||
* Return 3 if fully connected.
|
||||
* Return 4 if timed out and waiting to be killed.
|
||||
*/
|
||||
int is_connected(int connection_id)
|
||||
{
|
||||
if (connection_id >= 0 && connection_id < MAX_CONNECTIONS)
|
||||
|
|
@ -327,8 +395,10 @@ char id_packet(int connection_id)
|
|||
{
|
||||
if (connection_id < 0 || connection_id >= MAX_CONNECTIONS)
|
||||
return -1;
|
||||
|
||||
if (recvqueue(connection_id) != 0 && connections[connection_id].status != 0)
|
||||
return connections[connection_id].recvbuffer[connections[connection_id].successful_read % MAX_QUEUE_NUM].data[0];
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
|
@ -338,7 +408,7 @@ int read_packet(int connection_id, uint8_t * data)
|
|||
{
|
||||
if (recvqueue(connection_id) != 0) {
|
||||
uint16_t index = connections[connection_id].successful_read % MAX_QUEUE_NUM;
|
||||
uint16_t size = connections[connection_id].recvbuffer[index].size;
|
||||
uint16_t size = connections[connection_id].recvbuffer[index].size;
|
||||
memcpy(data, connections[connection_id].recvbuffer[index].data, size);
|
||||
++connections[connection_id].successful_read;
|
||||
connections[connection_id].recvbuffer[index].size = 0;
|
||||
|
|
@ -347,14 +417,15 @@ int read_packet(int connection_id, uint8_t * data)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* return 0 if data could not be put in packet queue
|
||||
return 1 if data was put into the queue */
|
||||
/*
|
||||
* Return 0 if data could not be put in packet queue
|
||||
* Return 1 if data was put into the queue
|
||||
*/
|
||||
int write_packet(int connection_id, uint8_t * data, uint32_t length)
|
||||
{
|
||||
if (length > MAX_DATA_SIZE)
|
||||
return 0;
|
||||
if (length == 0)
|
||||
if (length > MAX_DATA_SIZE || length == 0)
|
||||
return 0;
|
||||
|
||||
if (sendqueue(connection_id) < BUFFER_PACKET_NUM) {
|
||||
uint32_t index = connections[connection_id].sendbuff_packetnum % MAX_QUEUE_NUM;
|
||||
memcpy(connections[connection_id].sendbuffer[index].data, data, length);
|
||||
|
|
@ -362,6 +433,7 @@ int write_packet(int connection_id, uint8_t * data, uint32_t length)
|
|||
connections[connection_id].sendbuff_packetnum++;
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -371,8 +443,11 @@ uint32_t missing_packets(int connection_id, uint32_t * requested)
|
|||
uint32_t number = 0;
|
||||
uint32_t i;
|
||||
uint32_t temp;
|
||||
if (recvqueue(connection_id) >= (BUFFER_PACKET_NUM - 1)) /* don't request packets if the buffer is full. */
|
||||
|
||||
/* don't request packets if the buffer is full. */
|
||||
if (recvqueue(connection_id) >= (BUFFER_PACKET_NUM - 1))
|
||||
return 0;
|
||||
|
||||
for (i = connections[connection_id].recv_packetnum; i != connections[connection_id].osent_packetnum; i++) {
|
||||
if(connections[connection_id].recvbuffer[i % MAX_QUEUE_NUM].size == 0) {
|
||||
temp = htonl(i);
|
||||
|
|
@ -380,14 +455,19 @@ uint32_t missing_packets(int connection_id, uint32_t * requested)
|
|||
++number;
|
||||
}
|
||||
}
|
||||
|
||||
if(number == 0)
|
||||
connections[connection_id].recv_packetnum = connections[connection_id].osent_packetnum;
|
||||
|
||||
return number;
|
||||
}
|
||||
|
||||
/* Packet sending functions
|
||||
One per packet type.
|
||||
see docs/Lossless_UDP.txt for more information. */
|
||||
/*
|
||||
* BEGIN Packet sending functions
|
||||
* One per packet type.
|
||||
* see docs/Lossless_UDP.txt for more information.
|
||||
*/
|
||||
|
||||
int send_handshake(IP_Port ip_port, uint32_t handshake_id1, uint32_t handshake_id2)
|
||||
{
|
||||
uint8_t packet[1 + 4 + 4];
|
||||
|
|
@ -398,21 +478,22 @@ int send_handshake(IP_Port ip_port, uint32_t handshake_id1, uint32_t handshake_i
|
|||
memcpy(packet + 1, &temp, 4);
|
||||
temp = htonl(handshake_id2);
|
||||
memcpy(packet + 5, &temp, 4);
|
||||
|
||||
return sendpacket(ip_port, packet, sizeof(packet));
|
||||
}
|
||||
|
||||
int send_SYNC(uint32_t connection_id)
|
||||
{
|
||||
|
||||
uint8_t packet[(BUFFER_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;
|
||||
IP_Port ip_port = connections[connection_id].ip_port;
|
||||
uint8_t counter = connections[connection_id].send_counter;
|
||||
uint32_t recv_packetnum = htonl(connections[connection_id].recv_packetnum);
|
||||
uint32_t sent_packetnum = htonl(connections[connection_id].sent_packetnum);
|
||||
|
||||
uint32_t requested[BUFFER_PACKET_NUM];
|
||||
uint32_t number = missing_packets(connection_id, requested);
|
||||
uint32_t number = missing_packets(connection_id, requested);
|
||||
|
||||
packet[0] = 17;
|
||||
index += 1;
|
||||
|
|
@ -462,17 +543,24 @@ int send_DATA(uint32_t connection_id)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* END of packet sending functions */
|
||||
/*
|
||||
* END of packet sending functions
|
||||
*
|
||||
*
|
||||
* BEGIN Packet handling functions
|
||||
* One to handle each type of packets we receive
|
||||
*/
|
||||
|
||||
/* Packet handling functions
|
||||
One to handle each type of packets we receive
|
||||
return 0 if handled correctly, 1 if packet is bad. */
|
||||
|
||||
/* Return 0 if handled correctly, 1 if packet is bad. */
|
||||
int handle_handshake(uint8_t * packet, uint32_t length, IP_Port source)
|
||||
{
|
||||
if (length != (1 + 4 + 4))
|
||||
return 1;
|
||||
|
||||
uint32_t temp;
|
||||
uint32_t handshake_id1, handshake_id2;
|
||||
|
||||
int connection = getconnection_id(source);
|
||||
memcpy(&temp, packet + 1, 4);
|
||||
handshake_id1 = ntohl(temp);
|
||||
|
|
@ -485,21 +573,22 @@ int handle_handshake(uint8_t * packet, uint32_t length, IP_Port source)
|
|||
}
|
||||
if (is_connected(connection) != 1)
|
||||
return 1;
|
||||
if (handshake_id2 == connections[connection].handshake_id1) { /* if handshake_id2 is what we sent previously as handshake_id1 */
|
||||
|
||||
/* if handshake_id2 is what we sent previously as handshake_id1 */
|
||||
if (handshake_id2 == connections[connection].handshake_id1) {
|
||||
connections[connection].status = 2;
|
||||
/* NOTE: is this necessary?
|
||||
connections[connection].handshake_id2 = handshake_id1; */
|
||||
connections[connection].orecv_packetnum = handshake_id2;
|
||||
connections[connection].osent_packetnum = handshake_id1;
|
||||
connections[connection].recv_packetnum = handshake_id1;
|
||||
connections[connection].recv_packetnum = handshake_id1;
|
||||
connections[connection].successful_read = handshake_id1;
|
||||
}
|
||||
return 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* returns 1 if sync packet is valid
|
||||
0 if not. */
|
||||
/* returns 1 if sync packet is valid 0 if not. */
|
||||
int SYNC_valid(uint32_t length)
|
||||
{
|
||||
if (length < 4 + 4 + 2)
|
||||
|
|
@ -510,19 +599,19 @@ int SYNC_valid(uint32_t length)
|
|||
return 1;
|
||||
}
|
||||
|
||||
/* case 1: */
|
||||
/* case 1 in handle_SYNC: */
|
||||
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].orecv_packetnum = recv_packetnum;
|
||||
connections[x].sent_packetnum = recv_packetnum;
|
||||
connections[x].sendbuff_packetnum = recv_packetnum;
|
||||
connections[x].successful_sent = recv_packetnum;
|
||||
connections[x].osent_packetnum = sent_packetnum;
|
||||
connections[x].recv_packetnum = sent_packetnum;
|
||||
connections[x].successful_read = sent_packetnum;
|
||||
connections[x].successful_sent = recv_packetnum;
|
||||
connections[x].osent_packetnum = sent_packetnum;
|
||||
connections[x].recv_packetnum = sent_packetnum;
|
||||
connections[x].successful_read = sent_packetnum;
|
||||
|
||||
return x;
|
||||
}
|
||||
|
|
@ -530,7 +619,7 @@ int handle_SYNC1(IP_Port source, uint32_t recv_packetnum, uint32_t sent_packetnu
|
|||
return -1;
|
||||
}
|
||||
|
||||
/* case 2: */
|
||||
/* case 2 in handle_SYNC: */
|
||||
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) {
|
||||
|
|
@ -543,7 +632,7 @@ int handle_SYNC2(int connection_id, uint8_t counter, uint32_t recv_packetnum, ui
|
|||
}
|
||||
return 1;
|
||||
}
|
||||
/* case 3: */
|
||||
/* case 3 in handle_SYNC: */
|
||||
int handle_SYNC3(int connection_id, uint8_t counter, uint32_t recv_packetnum, uint32_t sent_packetnum, uint32_t * req_packets,
|
||||
uint16_t number)
|
||||
{
|
||||
|
|
@ -553,17 +642,25 @@ int handle_SYNC3(int connection_id, uint8_t counter, uint32_t recv_packetnum, ui
|
|||
uint32_t comp_2 = (sent_packetnum - connections[connection_id].successful_read); */
|
||||
uint32_t comp_1 = (recv_packetnum - connections[connection_id].orecv_packetnum);
|
||||
uint32_t comp_2 = (sent_packetnum - connections[connection_id].osent_packetnum);
|
||||
if (comp_1 <= BUFFER_PACKET_NUM && comp_2 <= BUFFER_PACKET_NUM && comp_counter < 10 && comp_counter != 0) { /* packet valid */
|
||||
|
||||
/* packet valid */
|
||||
if (comp_1 <= BUFFER_PACKET_NUM &&
|
||||
comp_2 <= BUFFER_PACKET_NUM &&
|
||||
comp_counter < 10 && comp_counter != 0) {
|
||||
|
||||
connections[connection_id].orecv_packetnum = recv_packetnum;
|
||||
connections[connection_id].osent_packetnum = sent_packetnum;
|
||||
connections[connection_id].successful_sent = recv_packetnum;
|
||||
connections[connection_id].last_recvSYNC = current_time();
|
||||
connections[connection_id].recv_counter = counter;
|
||||
connections[connection_id].last_recvSYNC = current_time();
|
||||
connections[connection_id].recv_counter = counter;
|
||||
|
||||
++connections[connection_id].send_counter;
|
||||
|
||||
for (i = 0; i < number; ++i) {
|
||||
temp = ntohl(req_packets[i]);
|
||||
memcpy(connections[connection_id].req_packets + i, &temp, 4 * number);
|
||||
}
|
||||
|
||||
connections[connection_id].num_req_paquets = number;
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -575,6 +672,7 @@ int handle_SYNC(uint8_t *packet, uint32_t length, IP_Port source)
|
|||
|
||||
if (!SYNC_valid(length))
|
||||
return 1;
|
||||
|
||||
int connection = getconnection_id(source);
|
||||
uint8_t counter;
|
||||
uint32_t temp;
|
||||
|
|
@ -587,19 +685,27 @@ int handle_SYNC(uint8_t *packet, uint32_t length, IP_Port source)
|
|||
recv_packetnum = ntohl(temp);
|
||||
memcpy(&temp,packet + 6, 4);
|
||||
sent_packetnum = ntohl(temp);
|
||||
|
||||
if (number != 0)
|
||||
memcpy(req_packets, packet + 10, 4 * number);
|
||||
|
||||
if (connection == -1)
|
||||
return handle_SYNC1(source, recv_packetnum, sent_packetnum);
|
||||
|
||||
if (connections[connection].status == 2)
|
||||
return handle_SYNC2(connection, counter, recv_packetnum, sent_packetnum);
|
||||
return handle_SYNC2(connection, counter,
|
||||
recv_packetnum, sent_packetnum);
|
||||
|
||||
if (connections[connection].status == 3)
|
||||
return handle_SYNC3(connection, counter, recv_packetnum, sent_packetnum, req_packets, number);
|
||||
return handle_SYNC3(connection, counter, recv_packetnum,
|
||||
sent_packetnum, req_packets, number);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* add a packet to the received buffer and set the recv_packetnum of the connection to its proper value.
|
||||
return 1 if data was too big, 0 if not. */
|
||||
/*
|
||||
* Add a packet to the received buffer and set the recv_packetnum of the
|
||||
* connection to its proper value. Return 1 if data was too big, 0 if not.
|
||||
*/
|
||||
int add_recv(int connection_id, uint32_t data_num, uint8_t *data, uint16_t size)
|
||||
{
|
||||
if (size > MAX_DATA_SIZE)
|
||||
|
|
@ -608,16 +714,22 @@ int add_recv(int connection_id, uint32_t data_num, uint8_t *data, uint16_t size)
|
|||
uint32_t i;
|
||||
uint32_t maxnum = connections[connection_id].successful_read + BUFFER_PACKET_NUM;
|
||||
uint32_t sent_packet = data_num - connections[connection_id].osent_packetnum;
|
||||
|
||||
for (i = connections[connection_id].recv_packetnum; i != maxnum; ++i) {
|
||||
if (i == data_num) {
|
||||
memcpy(connections[connection_id].recvbuffer[i % MAX_QUEUE_NUM].data, data, size);
|
||||
|
||||
connections[connection_id].recvbuffer[i % MAX_QUEUE_NUM].size = size;
|
||||
connections[connection_id].last_recvdata = current_time();
|
||||
if (sent_packet < BUFFER_PACKET_NUM)
|
||||
|
||||
if (sent_packet < BUFFER_PACKET_NUM) {
|
||||
connections[connection_id].osent_packetnum = data_num;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = connections[connection_id].recv_packetnum; i != maxnum; ++i) {
|
||||
if (connections[connection_id].recvbuffer[i % MAX_QUEUE_NUM].size != 0)
|
||||
connections[connection_id].recv_packetnum = i;
|
||||
|
|
@ -635,25 +747,30 @@ int handle_data(uint8_t *packet, uint32_t length, IP_Port source)
|
|||
if (connection == -1)
|
||||
return 1;
|
||||
|
||||
if (connections[connection].status != 3) /* Drop the data packet if connection is not connected. */
|
||||
/* Drop the data packet if connection is not connected. */
|
||||
if (connections[connection].status != 3)
|
||||
return 1;
|
||||
|
||||
if (length > 1 + 4 + MAX_DATA_SIZE || length < 1 + 4 + 1)
|
||||
return 1;
|
||||
|
||||
uint32_t temp;
|
||||
uint32_t number;
|
||||
uint16_t size = length - 1 - 4;
|
||||
|
||||
memcpy(&temp, packet + 1, 4);
|
||||
number = ntohl(temp);
|
||||
|
||||
return add_recv(connection, number, packet + 5, size);
|
||||
}
|
||||
|
||||
/* END of packet handling functions */
|
||||
/*
|
||||
* END of packet handling functions
|
||||
*/
|
||||
|
||||
int LosslessUDP_handlepacket(uint8_t *packet, uint32_t length, IP_Port source)
|
||||
{
|
||||
switch (packet[0]) { //TODO: check if no break statement is correct???
|
||||
switch (packet[0]) {
|
||||
case 16:
|
||||
return handle_handshake(packet, length, source);
|
||||
|
||||
|
|
@ -670,8 +787,10 @@ int LosslessUDP_handlepacket(uint8_t *packet, uint32_t length, IP_Port source)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/* Send handshake requests
|
||||
handshake packets are sent at the same rate as SYNC packets */
|
||||
/*
|
||||
* Send handshake requests
|
||||
* handshake packets are sent at the same rate as SYNC packets
|
||||
*/
|
||||
void doNew()
|
||||
{
|
||||
uint32_t i;
|
||||
|
|
@ -684,10 +803,13 @@ void doNew()
|
|||
}
|
||||
|
||||
/* kill all timed out connections */
|
||||
if ( connections[i].status > 0 && (connections[i].last_recvSYNC + connections[i].timeout * 1000000UL) < temp_time &&
|
||||
connections[i].status != 4)
|
||||
/* kill_connection(i); */
|
||||
if (connections[i].status > 0 &&
|
||||
(connections[i].last_recvSYNC + connections[i].timeout * 1000000UL) < temp_time &&
|
||||
connections[i].status != 4) {
|
||||
connections[i].status = 4;
|
||||
/* kill_connection(i); */
|
||||
}
|
||||
|
||||
if (connections[i].status > 0 && connections[i].killat < temp_time)
|
||||
kill_connection(i);
|
||||
}
|
||||
|
|
@ -720,11 +842,13 @@ void doData()
|
|||
}
|
||||
}
|
||||
|
||||
/* TODO: flow control.
|
||||
automatically adjusts send rates of packets for optimal transmission. */
|
||||
|
||||
#define MAX_SYNC_RATE 10
|
||||
|
||||
/*
|
||||
* Automatically adjusts send rates of packets for optimal transmission.
|
||||
*
|
||||
* TODO: flow control.
|
||||
*/
|
||||
void adjustRates()
|
||||
{
|
||||
uint32_t i;
|
||||
|
|
@ -744,8 +868,7 @@ void adjustRates()
|
|||
}
|
||||
}
|
||||
|
||||
/* Call this function a couple times per second
|
||||
It's the main loop. */
|
||||
/* Call this function a couple times per second It's the main loop. */
|
||||
void doLossless_UDP()
|
||||
{
|
||||
doNew();
|
||||
|
|
|
|||
|
|
@ -33,70 +33,90 @@ extern "C" {
|
|||
/* maximum length of the data in the data packets */
|
||||
#define MAX_DATA_SIZE 1024
|
||||
|
||||
/* Functions */
|
||||
|
||||
/* initialize a new connection to ip_port
|
||||
returns an integer corresponding to the connection id.
|
||||
return -1 if it could not initialize the connection.
|
||||
if there already was an existing connection to that ip_port return its number. */
|
||||
/*
|
||||
* Initialize a new connection to ip_port
|
||||
* Returns an integer corresponding to the connection id.
|
||||
* Return -1 if it could not initialize the connection.
|
||||
* Return number if there already was an existing connection to that ip_port.
|
||||
*/
|
||||
int new_connection(IP_Port ip_port);
|
||||
|
||||
/* get connection id from IP_Port
|
||||
return -1 if there are no connections like we are looking for
|
||||
return id if it found it */
|
||||
/*
|
||||
* Get connection id from IP_Port.
|
||||
* Return -1 if there are no connections like we are looking for.
|
||||
* Return id if it found it .
|
||||
*/
|
||||
int getconnection_id(IP_Port ip_port);
|
||||
|
||||
/* returns an integer corresponding to the next connection in our imcoming connection list
|
||||
return -1 if there are no new incoming connections in the list. */
|
||||
/*
|
||||
* Returns an int corresponding to the next connection in our imcoming connection list
|
||||
* Return -1 if there are no new incoming connections in the list.
|
||||
*/
|
||||
int incoming_connection();
|
||||
|
||||
/* return -1 if it could not kill the connection.
|
||||
return 0 if killed successfully */
|
||||
/*
|
||||
* Return -1 if it could not kill the connection.
|
||||
* Return 0 if killed successfully
|
||||
*/
|
||||
int kill_connection(int connection_id);
|
||||
|
||||
/* kill connection in seconds seconds.
|
||||
return -1 if it can not kill the connection.
|
||||
return 0 if it will kill it */
|
||||
/*
|
||||
* Kill connection in seconds seconds.
|
||||
* Return -1 if it can not kill the connection.
|
||||
* Return 0 if it will kill it
|
||||
*/
|
||||
int kill_connection_in(int connection_id, uint32_t seconds);
|
||||
|
||||
/* returns the ip_port of the corresponding connection.
|
||||
return 0 if there is no such connection. */
|
||||
/*
|
||||
* Returns the ip_port of the corresponding connection.
|
||||
* Return 0 if there is no such connection.
|
||||
*/
|
||||
IP_Port connection_ip(int connection_id);
|
||||
|
||||
/* returns the id of the next packet in the queue
|
||||
return -1 if no packet in queue */
|
||||
/*
|
||||
* Returns the id of the next packet in the queue
|
||||
* Return -1 if no packet in queue
|
||||
*/
|
||||
char id_packet(int connection_id);
|
||||
|
||||
/* return 0 if there is no received data in the buffer.
|
||||
return length of received packet if successful */
|
||||
/*
|
||||
* Return 0 if there is no received data in the buffer.
|
||||
* Return length of received packet if successful
|
||||
*/
|
||||
int read_packet(int connection_id, uint8_t *data);
|
||||
|
||||
/* return 0 if data could not be put in packet queue
|
||||
return 1 if data was put into the queue */
|
||||
/*
|
||||
* Return 0 if data could not be put in packet queue
|
||||
* Return 1 if data was put into the queue
|
||||
*/
|
||||
int write_packet(int connection_id, uint8_t *data, uint32_t length);
|
||||
|
||||
/* returns the number of packets in the queue waiting to be successfully sent. */
|
||||
/* Returns the number of packets in the queue waiting to be successfully sent. */
|
||||
uint32_t sendqueue(int connection_id);
|
||||
|
||||
/* returns the number of packets in the queue waiting to be successfully read with read_packet(...) */
|
||||
/*
|
||||
* returns the number of packets in the queue waiting to be successfully
|
||||
* read with read_packet(...)
|
||||
*/
|
||||
uint32_t recvqueue(int connection_id);
|
||||
|
||||
/* check if connection is connected
|
||||
return 0 no.
|
||||
return 1 if attempting handshake
|
||||
return 2 if handshake is done
|
||||
return 3 if fully connected
|
||||
return 4 if timed out and wating to be killed */
|
||||
/* Check if connection is connected:
|
||||
* Return 0 no.
|
||||
* Return 1 if attempting handshake.
|
||||
* Return 2 if handshake is done.
|
||||
* Return 3 if fully connected.
|
||||
* Return 4 if timed out and wating to be killed.
|
||||
*/
|
||||
int is_connected(int connection_id);
|
||||
|
||||
/* Call this function a couple times per second
|
||||
It's the main loop. */
|
||||
/* Call this function a couple times per second It's the main loop. */
|
||||
void doLossless_UDP();
|
||||
|
||||
|
||||
/* 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. */
|
||||
/*
|
||||
* If we receive a Lossless_UDP packet, 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(uint8_t *packet, uint32_t length, IP_Port source);
|
||||
|
||||
#ifdef __cplusplus
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user