Moved the network functions from the DHT into network.

Also made a nice function to init networking.

1 files changed, 74 insertions, 0 deletions

diff --git a/core/network.c b/core/network.c
new file mode 100644
index 00000000..10a37b80
--- /dev/null
+++ b/core/network.c
@@ -0,0 +1,74 @@
+
+
+#include "network.h"
+
+//our UDP socket, a global variable.
+static int sock;
+
+//Basic network functions:
+//TODO: put them somewhere else than here
+
+//Function to send packet(data) of length length to ip_port
+int sendpacket(IP_Port ip_port, char * data, uint32_t length)
+{
+    ADDR addr = {AF_INET, ip_port.port, ip_port.ip}; 
+    return sendto(sock, data, length, 0, (struct sockaddr *)&addr, sizeof(addr));
+    
+}
+
+//Function to recieve data, ip and port of sender is put into ip_port
+//the packet data into data
+//the packet length into length.
+//dump all empty packets.
+int recievepacket(IP_Port * ip_port, char * data, uint32_t * length)
+{
+    ADDR addr;
+    uint32_t addrlen = sizeof(addr);
+    (*(int *)length) = recvfrom(sock, data, MAX_UDP_PACKET_SIZE, 0, (struct sockaddr *)&addr, &addrlen);
+    if(*(int *)length <= 0)
+    {
+        //nothing recieved
+        //or empty packet
+        return -1;
+    }
+    ip_port->ip = addr.ip;
+    ip_port->port = addr.port;
+    return 0;
+    
+}
+
+//initialize networking
+//bind to ip and port
+//ip must be in network order EX: 127.0.0.1 = (7F000001)
+//port is in host byte order (this means don't worry about it)
+//returns 0 if no problems
+//TODO: add something to check if there are errors
+int init_networking(IP ip ,uint16_t port)
+{
+    #ifdef WIN32
+    WSADATA wsaData;
+    if(WSAStartup(MAKEWORD(2,2), &wsaData) != NO_ERROR)
+    {
+        return -1;
+    }
+    #endif
+    
+    //initialize our socket
+    sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 
+    
+    //Set socket nonblocking
+    #ifdef WIN32
+    //I think this works for windows
+    u_long mode = 1;
+    //ioctl(sock, FIONBIO, &mode);
+    ioctlsocket(sock, FIONBIO, &mode); 
+    #else
+    fcntl(sock, F_SETFL, O_NONBLOCK, 1);
+    #endif
+    
+    //Bind our socket to port PORT and address 0.0.0.0
+    ADDR addr = {AF_INET, htons(port), ip}; 
+    bind(sock, (struct sockaddr*)&addr, sizeof(addr));   
+    return 0;
+
+}
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