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#include "DHT.h"
//Function to send packet(data) of length length to ip_port
int sendpacket(IP_Port ip_port, char * data, uint32_t length)
{
ADDR addr = {.family = AF_INET, .ip = ip_port.ip, .port = ip_port.port};
return sendto(sock, data, length, 0, (struct sockaddr *)&addr, sizeof(addr));
}
//Attempt to add client with ip_port and client_id to the friends client list and close_clientlist
int addto_lists(IP_Port ip_port, char * client_id)
{
}
//send a ping request
//Currently incomplete: missing the ping_id part
int pingreq(IP_Port ip_port)
{
char data[37];
data[0] = 0;
memcpy(data + 5, self_client_id, 32);
sendpacket(ip_port, data, sizeof(data));
}
//send a ping response
//Currently incomplete: missing the ping_id part
int pingres(IP_Port ip_port, uint32_t ping_id)
{
char data[37];
data[0] = 1;
memcpy(data + 1, &ping_id, 4);
memcpy(data + 5, self_client_id, 32);
sendpacket(ip_port, data, sizeof(data));
}
//send a getnodes request
//Currently incomplete: missing the ping_id part
int getnodes(IP_Port ip_port, char * client_id)
{
char data[69];
data[0] = 2;
memcpy(data + 5, self_client_id, 32);
memcpy(data + 37, client_id, 32);
sendpacket(ip_port, data, sizeof(data));
}
//send a getnodes request
//Currently incomplete: missing the ping_id part
int sendnodes(IP_Port ip_port, char * client_id)
{
char data[325];
data[0] = 3;
memcpy(data + 5, self_client_id, 32);
memcpy(data + 37, client_id, 32);
sendpacket(ip_port, data, sizeof(data));
}
//Packet handling functions
//One to handle each types of packets
int handle_pingreq(char * packet, uint32_t length, IP_Port source)
{
uint32_t ping_id;
memcpy(&ping_id, packet + 1, 4);
pingres(source, ping_id);
}
int handle_pingres(char * packet, uint32_t length, IP_Port source)
{
}
int handle_getnodes(char * packet, uint32_t length, IP_Port source)
{
}
int handle_sendnodes(char * packet, uint32_t length, IP_Port source)
{
}
void addfriend(char * client_id)
{
}
char delfriend(char * client_id)
{
}
IP_Port getfriendip(char * client_id)
{
}
void DHT_recvpacket(char * packet, uint32_t length, IP_Port source)
{
switch (packet[0]) {
case 0:
handle_pingreq(packet, length, source);
//TODO: try to add requesting node to client_list if packet is valid
break;
case 1:
handle_pingres(packet, length, source);
break;
case 2:
handle_getnodes(packet, length, source);
//TODO: try to add requesting node to client_list if packet is valid
break;
case 3:
handle_sendnodes(packet, length, source);
break;
default:
return;
}
}
void doDHT()
{
}
void bootstrap(IP_Port ip_port)
{
getnodes(ip_port, self_client_id);
}
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