source: Daodan/MSVC/Flatline_Net.c@ 572

#include "Flatline.h"
#include "Flatline_Server.h"


#define TRACK_PACKETS

/*thread */int UDPServer_Socket = 0;




bool NetUDPServer_Listen(uint16_t port, bool (*packet_callback)(char* data, int datalen, int from))
{
        sockaddr_in address;    
        UDPServer_Socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        
        if (UDPServer_Socket < 0)
        {
                DDrConsole_PrintF("could not create socket");
                return false;
        }
        

        memset(&address, 0, sizeof(sockaddr_in));
        address.sin_family = AF_INET;
        address.sin_addr.s_addr = htonl(INADDR_ANY);
        address.sin_port = htons(port);
        
        if (bind(UDPServer_Socket, (sockaddr*)&address, sizeof(sockaddr_in)) < 0)
        {
                DDrConsole_PrintF("could not bind port %d", port);
                closesocket(UDPServer_Socket);
                return false;
        }
        else {


                char data[65537] = {0};
        
                sockaddr_in from;
                int recvlen;
                FLrServer_Initialize();
                for (;;)
                {
                        int fromlen = sizeof(sockaddr_in);
                        memset(&from, 0, sizeof(sockaddr_in));
                        recvlen = recvfrom(UDPServer_Socket, data, 65537 - 1, 0, (sockaddr*)&from, (void*)&fromlen);

                        if (!packet_callback(data, recvlen, ntohl(from.sin_addr.s_addr)))
                                break; 
                }
                closesocket(UDPServer_Socket);
                return true;
        }
}

bool NetUDPServer_Send(sockaddr* address, flatline_packet* data, int datalen)
{
        //DDrConsole_PrintF("Sending data size %u to %s on socket %i", datalen, inet_ntoa( ((sockaddr_in*)address)->sin_addr ), UDPServer_Socket);
        data->FLATLINE = *(int*)"FLATLINE";
        return NetUDPSocket_Send(UDPServer_Socket, address, data, datalen);
}

int client_sock = 0;
sockaddr_in client_address;

int NetUDPSocket_Create(uint16_t port)
{
        int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
        sockaddr_in address;    
                unsigned long nonBlocking = 1;
        if (sock < 0)
        {
                DDrConsole_PrintF("could not create socket");
                return -1;
        }
        

        memset(&client_address, 0, sizeof(sockaddr_in));
        address.sin_family = AF_INET;
        address.sin_addr.s_addr = htonl(INADDR_ANY);
        address.sin_port =  htons(port);
        
        if (bind(sock, (sockaddr*)&address, sizeof(sockaddr_in)) < 0)
        {
                DDrConsole_PrintF("could not bind port %d", port);
                return false;
        }
        

        if (ioctlsocket(sock, FIONBIO, &nonBlocking))
        {
                DDrConsole_PrintF("failed to set non-blocking socket");
                return false;
        }
        client_sock = sock;
        client_address = address;
        return sock;
}

int NetTCPSocket_Create(uint16_t port)
{
        int sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
        sockaddr_in address;
                unsigned long nonBlocking = 1;

        if (sock < 0)
        {
                DDrConsole_PrintF("could not create socket");
                return -1;
        }
        

        memset(&client_address, 0, sizeof(sockaddr_in));
        address.sin_family = AF_INET;
        address.sin_addr.s_addr = htonl(INADDR_ANY);
        address.sin_port =  htons(port);
        
        if (bind(sock, (sockaddr*)&address, sizeof(sockaddr_in)) < 0)
        {
                DDrConsole_PrintF("could not bind port %d", port);
                return false;
        }
        

        if (ioctlsocket(sock, FIONBIO, &nonBlocking))
        {
                DDrConsole_PrintF("failed to set non-blocking socket");
                return false;
        }
        client_sock = sock;
        client_address = address;
        return sock;
}


void NetUDPSocket_Close(int socket)
{
        closesocket(socket);
}

int NetUDPSocket_Send(int socket, const sockaddr* address, flatline_packet* data, int datalen)
{
        //currently only protects against duplicate packets.
        int addr_size;
#ifdef TRACK_PACKETS
        static uint32_t packet_index = 0;
        packet_index = (packet_index + 1);
        data->packet_index = packet_index;
#endif
        data->FLATLINE = *(int*)"FLATLINE";
        switch (address->sa_family)
        {
                case AF_INET:
                        addr_size = sizeof(sockaddr_in);
                        break;
                case AF_INET6:
                        addr_size = sizeof(sockaddr_in6);
                        break;
                default:
                        addr_size = sizeof(sockaddr_storage);
        }
        return sendto(socket, data, datalen, 0, address, addr_size);
}

#ifdef TRACK_PACKETS
uint32_t last_packet = -1;
#endif

bool NetUDPSocket_Recieve(int socket, sockaddr_storage* address, char* data, uint16_t* datalen)
{
        int address_size = sizeof(sockaddr_storage);
        uint32_t msg_size = recvfrom(socket, data, 1400, 0, (SOCKADDR *)address, &address_size);
        if (msg_size == 0)
                return false;
        else if (msg_size == SOCKET_ERROR) {
                int errorno = WSAGetLastError();
                if (errorno == WSAEWOULDBLOCK) return false; //no packets.
                else {
                        //DDrConsole_PrintF("Packet type %i", ((flatline_packet*)data)->id);
                        NetCatchError();
                        return false;
                }
        }       
        /*
#ifdef TRACK_PACKETS
        if(client_connected && !server_started) {
                uint32_t index_mkr = ((flatline_packet*)(data))->packet_index;
                //fancy way of checking if index_mkr is on one side of the max size of an int and last_packet is on the other
                if( ((index_mkr - last_packet < 0x80000000) && (index_mkr > last_packet))
                //if it is, subtract half the size of an int from each. ^_^
                        || ((index_mkr - 0x80000000) > (last_packet - 0x80000000) ) )
                {
                        return false;
                }
                else {
                        last_packet = index_mkr;
                }
        }
        
#endif
        */

        *datalen = msg_size;                            
        return true;
        
}

DWORD WINAPI StartServer(void* lol){
        NetPlatform_Initalize();
        FLrServer_Run();
        return 0;
} 

DWORD WINAPI StartClient(void* lol){
        //NetPlatform_Initalize();
        FLrClient_Run((flatline_packet*)lol);
        return 0;
} 
void NetCatchError(){
        char Message[1024];
        int errorno = WSAGetLastError();
        if(errno == WSAEWOULDBLOCK) {
                return;
        }
#ifdef WIN32

        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |
                FORMAT_MESSAGE_MAX_WIDTH_MASK, NULL, errorno,
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                (LPSTR) Message, 1024, NULL);
        DDrConsole_Print(Message);
#endif

}