psnet2.cpp

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/*
 * Copyright (C) Volition, Inc. 1999.  All rights reserved.
 *
 * All source code herein is the property of Volition, Inc. You may not sell 
 * or otherwise commercially exploit the source or things you created based on the 
 * source.
 *
*/




#ifdef _WIN32
#include <windows.h>
#include <windowsx.h>
#include <winsock.h>
#include <process.h>
#include <ras.h>
#include <raserror.h>
#else
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/select.h>
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>

#define WSAGetLastError()  (errno)
#endif
#include <stdio.h>
#include <limits.h>
#include <algorithm>

#include "globalincs/pstypes.h"
#include "network/psnet2.h"
#include "network/multi.h"
#include "network/multiutil.h"
#include "network/multilag.h"
#include "osapi/osregistry.h"
#include "io/timer.h"
#include "network/multi_log.h"
#include "network/multi_rate.h"
#include "cmdline/cmdline.h"

// -------------------------------------------------------------------------------------------------------
// PSNET 2 DEFINES/VARS
//

int             Psnet_my_addr_valid;
net_addr Psnet_my_addr;

ubyte Null_address[6];

int Socket_type;
int Can_broadcast;                      // can we do broadcasting on our socket?
int Tcp_can_broadcast = 0;

int Tcp_active = 0;

int Network_status;
int Tcp_failure_code = 0;
int Ras_connected;
int Psnet_connection;

ushort  Psnet_default_port;

// specified their internet connnection type
#define NETWORK_CONNECTION_NONE                 1
#define NETWORK_CONNECTION_DIALUP               2
#define NETWORK_CONNECTION_LAN                  3

// defines and variables to indicate network connection status
#define NETWORK_STATUS_NOT_INITIALIZED  1
#define NETWORK_STATUS_NO_WINSOCK               2                       // winsock failed to initialize
#define NETWORK_STATUS_NO_PROTOCOL              3                       // TCP/IP doesn't appear to be loaded
#define NETWORK_STATUS_NO_RELIABLE              4
#define NETWORK_STATUS_RUNNING                  5                       // everything should be running

// defintion of structures that actually leave this machine.  psnet_send give us only
// the data that we want to send.  We will add a header onto this data (packet sequence
// number, possibly a checksum).  We must include a 2 byte flags variable into both structure
// since the receiving end of this packet must know whether or not to checksum the packet.

#define MAX_TOP_LAYER_PACKET_SIZE                       680

// use the pack pragma to pack these structures to 2 byte aligment.  Really only needed for
// the naked packet.
#define MAX_PACKET_BUFFERS              75

#pragma pack(push, 2)

typedef struct network_packet
{
        int             sequence_number;
        ushort  flags;
        ubyte           data[MAX_TOP_LAYER_PACKET_SIZE];
} network_naked_packet;

typedef struct network_packet_buffer
{
        int             sequence_number;
        int             len;    
        net_addr        from_addr;
        ubyte           data[MAX_TOP_LAYER_PACKET_SIZE];
} network_packet_buffer;

typedef struct network_packet_buffer_list {
        network_packet_buffer psnet_buffers[MAX_PACKET_BUFFERS];
        int psnet_seq_number;
        int psnet_lowest_id;
        int psnet_highest_id;
} network_packet_buffer_list;

#pragma pack(pop)


#define MAXHOSTNAME                     128

#define MAX_RECEIVE_BUFSIZE     4096    // 32 K, eh?
#define MAX_SEND_RETRIES                20                      // number of retries when sending would block
#define MAX_LINGER_TIME                 0                       // in seconds -- when lingering to close a socket

//Reliable UDP stuff
//*******************************
#define MAXNETBUFFERS                   150             // Maximum network buffers (For between network and upper level functions, which is 
                                                                                                        // required in case of out of order packets
#define NETRETRYTIME                            0.75f           // Time after sending before we resend
#define MIN_NET_RETRYTIME               0.2f
#define NETTIMEOUT                              30                      // Time after receiving the last packet before we drop that user
#define NETHEARTBEATTIME                3                       // How often to send a heartbeat
#define MAXRELIABLESOCKETS              40                      // Max reliable sockets to open at once...
#define NETBUFFERSIZE                   600             // Max size of a network packet

#define RELIABLE_CONNECT_TIME           7               // how long we'll wait for a response when doing a reliable connect

int Nettimeout = NETTIMEOUT;

// Reliable packet stuff
#define RNT_ACK                         1                               // ACK Packet
#define RNT_DATA                                2                               // Data Packet
#define RNT_DATA_COMP           3                               // Compressed Data Packet
#define RNT_REQ_CONN                    4                               // Requesting a connection
#define RNT_DISCONNECT          5                               // Disconnecting a connection
#define RNT_HEARTBEAT           6                               // Heartbeat -- send every NETHEARTBEATTIME
#define RNT_I_AM_HERE           7

#pragma pack(push, 1)
typedef struct {
        ubyte                   type;                                   // packet type
        ubyte                   compressed;                     //
        ushort          seq;                                    // sequence packet 0-65535 used for ACKing also
        ushort          data_len;                       // length of data
        float                   send_time;                      // Time the packet was sent, if an ACK the time the packet being ACK'd was sent.
        ubyte           data[NETBUFFERSIZE];    // Packet data
} reliable_header;

#define RELIABLE_PACKET_HEADER_ONLY_SIZE (sizeof(reliable_header)-NETBUFFERSIZE)
#define MAX_PING_HISTORY        10

typedef struct {
        ubyte buffer[NETBUFFERSIZE];

} reliable_net_sendbuffer;

typedef struct {
        ubyte buffer[NETBUFFERSIZE];
} reliable_net_rcvbuffer;

typedef struct {
        reliable_net_sendbuffer *sbuffers[MAXNETBUFFERS];       // This is an array of pointers for quick sorting
        unsigned short ssequence[MAXNETBUFFERS];                                // This is the sequence number of the given packet
        float timesent[MAXNETBUFFERS];
        int send_len[MAXNETBUFFERS];
        reliable_net_rcvbuffer  *rbuffers[MAXNETBUFFERS];
        int recv_len[MAXNETBUFFERS];
        unsigned short rsequence[MAXNETBUFFERS];                                // This is the sequence number of the given packet
        float last_packet_received;                                                             // For a given connection, this is the last packet we received
        float last_packet_sent;
        SOCKADDR addr;                                                                                                  // SOCKADDR of our peer
        ushort status;                                                                                                  // Status of this connection
        unsigned short oursequence;                                                             // This is the next sequence number the application is expecting
        unsigned short theirsequence;                                                           // This is the next sequence number the peer is expecting
        net_addr        m_net_addr;                                                                                     // A FS2 network address structure
        ubyte connection_type;                                                                          // IP, modem, etc.
        float pings[MAX_PING_HISTORY];
        ubyte ping_pos;
        unsigned int num_ping_samples;
        float mean_ping;        
} reliable_socket;

reliable_socket Reliable_sockets[MAXRELIABLESOCKETS];

// sockets for TCP (unreliable)
SOCKET TCP_socket;

// the sockets that the game will use when selecting network type
SOCKET Unreliable_socket = INVALID_SOCKET;

float First_sent_iamhere = 0;
float Last_sent_iamhere = 0;

#define CONNECTSEQ 0x142                                                                                // Magic number for starting a connection, just so it isn't 0

unsigned int Serverconn = 0xffffffff;

#pragma pack(pop)
//*******************************

// top layer buffers
network_packet_buffer_list Psnet_top_buffers[PSNET_NUM_TYPES];

// -------------------------------------------------------------------------------------------------------
// PSNET 2 FORWARD DECLARATIONS
//

// if the string is a legally formatted ip string
int psnet_is_valid_numeric_ip(char *ip);

#ifdef _WIN32
// functions to get the status of a RAS connection
unsigned int psnet_ras_status();
#endif

// set some options on a socket
void psnet_socket_options( SOCKET sock );

// initialize tcp socket
int psnet_init_tcp();

// get time in seconds
float psnet_get_time();

// returns the ip address of this machine. use for calling bind() with to associate with the proper
// IP address and network device.
int psnet_get_ip();

// initialize reliable sockets
int psnet_init_rel_tcp(int port, int should_listen);

// shutdown reliable sockets
void psnet_rel_close();

// initialize the buffering system
void psnet_buffer_init(network_packet_buffer_list *l);

// buffer a packet (maintain order!)
void psnet_buffer_packet(network_packet_buffer_list *l, ubyte *data, int length, net_addr *from);

// get the index of the next packet in order!
int psnet_buffer_get_next(network_packet_buffer_list *l, ubyte *data, int *length, net_addr *from);


// -------------------------------------------------------------------------------------------------------
// PSNET 2 TOP LAYER FUNCTIONS - these functions simply buffer and store packets based upon type (see PSNET_TYPE_* defines)
//

int RECVFROM(SOCKET s, char *buf, int len, int flags, sockaddr *from, int *fromlen, int psnet_type)
{
        network_packet_buffer_list *l;
        net_addr addr;
        int ret;
        int ret_len;

        // bad type
        Assert((psnet_type >= 0) && (psnet_type < PSNET_NUM_TYPES));
        if((psnet_type < 0) || (psnet_type >= PSNET_NUM_TYPES)){
                return -1;
        }       
        l = &Psnet_top_buffers[psnet_type];

        // if we have no buffer! The user should have made sure this wasn't the case by calling SELECT()
        ret = psnet_buffer_get_next(l, (ubyte*)buf, &ret_len, &addr);
        if(!ret){
                Int3();
                return -1;
        }

        // otherwise, stuff the outgoing data
        switch ( Socket_type ) {
        case NET_TCP:                   
                ((SOCKADDR_IN*)from)->sin_port = htons(addr.port);
#ifdef _WIN32
                memcpy(&((SOCKADDR_IN*)from)->sin_addr.S_un.S_addr, addr.addr, 4);              
#else
                memcpy(&((SOCKADDR_IN*)from)->sin_addr.s_addr, addr.addr, 4);           
#endif
                ((SOCKADDR_IN*)from)->sin_family = AF_INET;
                *fromlen = sizeof(SOCKADDR_IN);
                break;

        default:
                Assert(0);
                break;
        }

        // return bytes read
        return ret_len;
}

int SELECT(int nfds, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval * timeout, int psnet_type)
{
        network_packet_buffer_list *l;

        // if this is a check for writability, just return the select 
        if(writefds != NULL){
                return select(nfds, readfds, writefds, exceptfds, timeout);
        }       
        
        // bad type
        Assert((psnet_type >= 0) && (psnet_type < PSNET_NUM_TYPES));
        if((psnet_type < 0) || (psnet_type >= PSNET_NUM_TYPES)){
                return -1;
        }       
        l = &Psnet_top_buffers[psnet_type];     

        // do we have any buffers in here?      
        if((l->psnet_lowest_id == -1) || (l->psnet_lowest_id > l->psnet_highest_id)){
                return 0;
        }

        // yo
        return 1;
}

int SENDTO(SOCKET s, char * buf, int len, int flags, sockaddr *to, int tolen, int psnet_type)
{       
        char outbuf[MAX_TOP_LAYER_PACKET_SIZE + 150];           

        // stuff type
        outbuf[0] = (char)psnet_type;
        memcpy(&outbuf[1], buf, len);
        
        // send it
        return sendto(s, outbuf, len + 1, flags, (SOCKADDR*)to, tolen);
}

void PSNET_TOP_LAYER_PROCESS()
{
        // read socket stuff
        SOCKADDR_IN ip_addr;                            // UDP/TCP socket structure
        fd_set  rfds;
        timeval timeout;
        int             read_len;
   socklen_t from_len;
        net_addr        from_addr;      
        network_naked_packet packet_read;               

        // clear the addresses to remove compiler warnings
        memset(&ip_addr, 0, sizeof(SOCKADDR_IN));

        if ( Network_status != NETWORK_STATUS_RUNNING ) {
                ml_string("Network ==> socket not inited in PSNET_TOP_LAYER_PROCESS");
                return;
        }

        while ( 1 ) {           
                // check if there is any data on the socket to be read.  The amount of data that can be 
                // atomically read is stored in len.

                FD_ZERO(&rfds);
                FD_SET( Unreliable_socket, &rfds );
                timeout.tv_sec = 0;
                timeout.tv_usec = 0;

#ifdef _WIN32
                if ( select( -1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
#else
                if ( select( Unreliable_socket + 1, &rfds, NULL, NULL, &timeout) == SOCKET_ERROR ) {
#endif
                        ml_printf("Error %d doing a socket select on read", WSAGetLastError());
                        break;
                }

                // if the read file descriptor is not set, then bail!
                if ( !FD_ISSET(Unreliable_socket, &rfds) ){
                        return;
                }

                // get data off the socket and process
                read_len = SOCKET_ERROR;
                switch ( Socket_type ) {
                case NET_TCP:
                        from_len = sizeof(SOCKADDR_IN);                 
                        read_len = recvfrom( Unreliable_socket, (char*)packet_read.data, MAX_TOP_LAYER_PACKET_SIZE, 0,  (SOCKADDR*)&ip_addr, &from_len);
                        break;
                
                default:
                        Assert(0);
                        return;
                }

                // set the from_addr for storage into the packet buffer structure
                from_addr.type = Socket_type;

                switch ( Socket_type ) {
                case NET_TCP:                   
                        from_addr.port = ntohs( ip_addr.sin_port );                     
                        memset(from_addr.addr, 0x00, 6);
#ifdef _WIN32
                        memcpy(from_addr.addr, &ip_addr.sin_addr.S_un.S_addr, 4); //-V512
#else
                        memcpy(from_addr.addr, &ip_addr.sin_addr.s_addr, 4); //-V512
#endif
                        break;

                default:
                        Assert(0);
                        return;
                        // break;
                }

                if ( read_len == SOCKET_ERROR ) {
                        ml_string("Socket error on socket_get_data()");
                        break;
                }               

                // determine the packet type
                int packet_type = packet_read.data[0];  
                Assertion(((packet_type >= 0) && (packet_type < PSNET_NUM_TYPES)), "Invalid packet_type found. Packet type %d does not exist", packet_type);
                if((packet_type >= 0) && (packet_type < PSNET_NUM_TYPES)){
                        // buffer the packet
                        psnet_buffer_packet(&Psnet_top_buffers[packet_type], packet_read.data + 1, read_len - 1, &from_addr);
                }
        }
}


// -------------------------------------------------------------------------------------------------------
// PSNET 2 FUNCTIONS
//

void psnet_init( int protocol, int port_num )
{       
        int idx;
        Tcp_active = 0;
#ifdef _WIN32
        const char *internet_connection;
        WSADATA wsa_data;               
#endif

        // GAME PORT INITIALIZATION STUFF
        if ( Network_status == NETWORK_STATUS_RUNNING ){
                ml_string("Skipping psnet_init() because network already running");
                return;
        }

// sort of a hack; assume unix users are always on LAN :)
#ifdef _WIN32
        internet_connection = os_config_read_string(NULL, "NetworkConnection", "none");
        if ( !stricmp(internet_connection, NOX("dialup")) ) {
                ml_string("psnet_init() detected dialup connection");

                Psnet_connection = NETWORK_CONNECTION_DIALUP;
        } else if ( !stricmp(internet_connection, NOX("lan")) ) {
                ml_string("psnet_init() detected lan connection");

                Psnet_connection = NETWORK_CONNECTION_LAN;
        } else {
                ml_string("psnet_init() detected no connection");

                Psnet_connection = NETWORK_CONNECTION_NONE;
        }
#else
        Psnet_connection = NETWORK_CONNECTION_LAN;
#endif

        Network_status = NETWORK_STATUS_NO_WINSOCK;
#ifdef _WIN32
        if (WSAStartup(0x101, &wsa_data )){
                return;
        }
#endif

        // get the port for running this game on.  Be careful that it cannot be out of bounds
        Psnet_default_port = DEFAULT_GAME_PORT;
        if ( (port_num > 1023) && (port_num < USHRT_MAX) ) {
                Psnet_default_port = (ushort)port_num;
        }

        // initialize TCP now   
        Tcp_active = 1;
        if(!psnet_init_tcp()){
                ml_printf("Error on TCP startup %d", Tcp_failure_code);         

                Tcp_active = 0;
        } else {
                if(!psnet_init_rel_tcp(Psnet_default_port + 1, 0)){
                        ml_printf("Error on TCP startup %d", Tcp_failure_code);                 

                        Tcp_active = 0;
                }
        }

        // clear reliable sockets
        reliable_socket *rsocket;
        int j;  
        for(j=0; j<MAXRELIABLESOCKETS; j++){
                rsocket=&Reliable_sockets[j];
                memset(rsocket,0,sizeof(reliable_socket));
        }

        // determine if we've successfully initialized the protocol we want
        if(!Tcp_active){        
                Network_status = NETWORK_STATUS_NO_PROTOCOL;            

                ml_string("No protocol in psnet_init()!");
        }

        // specified network timeout    
        Nettimeout = NETTIMEOUT;
        if(Cmdline_timeout > 0){
                Nettimeout = Cmdline_timeout;
        }

#ifdef _WIN32
        // set ras status
        psnet_ras_status();     
#endif

        if(Network_status != NETWORK_STATUS_NO_PROTOCOL){                       
                // set network to be running
                Network_status = NETWORK_STATUS_RUNNING;        
        
                // determine if our socket can broadcast
                Can_broadcast = Tcp_can_broadcast;
        
                // initialize all packet type buffers
                for(idx=0; idx<PSNET_NUM_TYPES; idx++){
                        psnet_buffer_init(&Psnet_top_buffers[idx]);
                }
        }
}

void psnet_close()
{
        if ( Network_status != NETWORK_STATUS_RUNNING ){
                return;
        }

#ifdef _WIN32
        WSACancelBlockingCall();                

        if ( TCP_socket != INVALID_SOCKET ) {
                shutdown( TCP_socket, 1 );
                closesocket( TCP_socket );
        }

        if (WSACleanup())       {
        }
#else
        if ( TCP_socket != (int)INVALID_SOCKET ) {
                shutdown( TCP_socket, 1 );
                close( TCP_socket );
        }
#endif

        // close down all reliable sockets - this forces them to
        // send a disconnect to any remote machines     
        psnet_rel_close();
        
        Network_status = NETWORK_STATUS_NOT_INITIALIZED;
}

int psnet_use_protocol( int protocol )
{
   socklen_t len;
        SOCKADDR_IN             ip_addr;
        const char *custom_ip = NULL;

        // zero out my address
        Psnet_my_addr_valid = 0;
        memset( &Psnet_my_addr, 0, sizeof(Psnet_my_addr) );

        // wait until we choose a protocol to determine if we can broadcast
        Can_broadcast = 0;

        ml_string("In psnet_use_protocol()");

        switch ( protocol ) {
        case NET_TCP:
                if ( Network_status != NETWORK_STATUS_RUNNING ){
                        ml_string("Network_status != NETWORK_STATUS_RUNNING in NET_TCP in psnet_use_protocol()");
                        return 0;
                }

                // assign the TCP_* sockets to the socket values used elsewhere
                Unreliable_socket = TCP_socket;         

                Can_broadcast = Tcp_can_broadcast;
                if(Can_broadcast){
                        ml_string("Psnet : TCP broadcast");
                }

                // get the socket name for the TCP_socket, and put it into My_addr
                len = sizeof(SOCKADDR_IN);
                if ( getsockname(TCP_socket, (SOCKADDR *)&ip_addr, &len) == SOCKET_ERROR ) {
                        ml_printf("Unable to get sock name for TCP unreliable socket (%d)", WSAGetLastError() );                        
                        return 0;
                }

                // check user-specified IP for getting around NAT
                custom_ip = os_config_read_string( NOX("Network"), NOX("CustomIP"), NULL );

                if (custom_ip != NULL) {
                        SOCKADDR_IN custom_address;

#ifndef WIN32
                        if ( inet_aton(custom_ip, &custom_address.sin_addr) ) {
#else
                        if ( (custom_address.sin_addr.s_addr = inet_addr(custom_ip)) != INADDR_NONE ) {
#endif
                                memcpy(&ip_addr.sin_addr, &custom_address.sin_addr, sizeof(custom_address.sin_addr));
                        } else {
                                ml_printf("WARNING  =>  psnet_get_ip() custom IP is invalid: %s", custom_ip);
                        }
                }

                memcpy(Psnet_my_addr.addr, &ip_addr.sin_addr, sizeof(ip_addr.sin_addr));
                Psnet_my_addr.port = Psnet_default_port;

                ml_string("Psnet using - NET_TCP");
                break;

        default:
                Int3();
                return 0;
        }

        Psnet_my_addr.type = protocol;
        Socket_type = protocol;

        return 1;
}

int psnet_get_network_status()
{
        // first case is when "none" is selected
        if ( Psnet_connection == NETWORK_CONNECTION_NONE ) {
                return NETWORK_ERROR_NO_TYPE;
        }

        // first, check the connection status of the network
        if ( Network_status == NETWORK_STATUS_NO_WINSOCK )
                return NETWORK_ERROR_NO_WINSOCK;

        if ( Network_status == NETWORK_STATUS_NO_PROTOCOL ){
                return NETWORK_ERROR_NO_PROTOCOL;
        }
        
        // network is running -- be sure that the RAS people know to connect if they currently cannot.
        
        if ( Psnet_connection == NETWORK_CONNECTION_DIALUP ) {
                // if on a dialup connection, be sure that RAS is active.
                if ( !Ras_connected ) {
                        return NETWORK_ERROR_CONNECT_TO_ISP;
                }
        } else if ( Psnet_connection == NETWORK_CONNECTION_LAN ) {
                // if on a LAN, and they have a dialup connection active, return error to indicate that they need
                // to pick the right connection type
                if ( Ras_connected ) {
                        return NETWORK_ERROR_LAN_AND_RAS;
                }
        }
        return NETWORK_ERROR_NONE;
}

char* psnet_addr_to_string( char * text, net_addr * address )
{

        if ( Network_status != NETWORK_STATUS_RUNNING )         {
                strcpy( text, XSTR("[no networking]",910) );
                return text;
        }

        in_addr temp_addr;

        switch ( address->type ) {
                case NET_TCP:
                        memcpy(&temp_addr.s_addr, address->addr, 4);
                        strcpy( text, inet_ntoa(temp_addr) );
                        break;

                default:
                        break;

        } // end switch
        
        return text;
}

void psnet_string_to_addr( net_addr * address, char * text )
{
        struct hostent *he;
        char str[255], *c, *port;
        in_addr addr;

        if ( Network_status != NETWORK_STATUS_RUNNING ) {
                strcpy( text, XSTR("[no networking]",910) );
                return;
        }

        // copy the text string to local storage to look for ports
        Assert( strlen(text) < 255 );
        strcpy_s(str, text);
        c = strrchr(str, ':');
        port = NULL;
        if ( c ) {
                *c = '\0';
                port = c+1;
        }

        switch ( address->type ) {
                case NET_TCP:
                        addr.s_addr = inet_addr(str);
                        // if we get INADDR_NONE returns, then we need to try and resolve the host
                        // name
                        if ( addr.s_addr == INADDR_NONE ) {
                                he = gethostbyname( str );
                                // returns a non-null pointer if successful, so get the address
                                if ( he ) {
                                        addr.s_addr = ((in_addr *)(he->h_addr))->s_addr;                        // this is the address in network byte order
                                } else {
                                        addr.s_addr = INADDR_NONE;
                                }
                        }

                        memset(address->addr, 0x00, 6);
                        memcpy(address->addr, &addr.s_addr, 4); //-V512
                        if ( port ){
                                address->port = (ushort)(atoi(port));
                        }
                        break;

                default:
                        Assert(0);
                        break;

        } // end switch
}

int psnet_same( net_addr * a1, net_addr * a2 )
{
        return !memcmp(a1->addr, a2->addr, 6) && a1->port == a2->port;
}

int psnet_send( net_addr * who_to, void * data, int len, int np_index )
{
        // send data unreliably
        SOCKET send_sock;
        SOCKADDR_IN sockaddr;                           // UDP/TCP socket structure
        int ret, send_len;
        ubyte iaddr[6], *send_data;
        short port;
        fd_set  wfds;
        struct timeval timeout; 

        // always use the unreliable socket
        send_sock = Unreliable_socket;          

        if ( Network_status != NETWORK_STATUS_RUNNING ) {
                ml_string("Network ==> Socket not inited in psnet_send");
                return 0;
        }

        if ( psnet_same( who_to, &Psnet_my_addr) ){
                return 0;
        }

        memset(iaddr, 0x00, 6);
        memcpy(iaddr, who_to->addr, 6);

        if ( memcmp(iaddr, Null_address, 6) == 0) {
                ml_string("Network ==> send to address is 0 in psnet_send");
                return 0;
        }
        
        port = who_to->port;
                
        if ( port == 0) {
                ml_printf("Network ==> destination port %d invalid in psnet_send", port);
                return 0;
        }

        // stuff the data with the type 
        send_data = (ubyte*)data;
        send_len = len;

        FD_ZERO(&wfds);
        FD_SET( send_sock, &wfds );
        timeout.tv_sec = 0;
        timeout.tv_usec = 0;

#ifdef _WIN32
        if ( SELECT( -1, NULL, &wfds, NULL, &timeout, PSNET_TYPE_UNRELIABLE) == SOCKET_ERROR ) {
#else
        if ( SELECT( send_sock+1, NULL, &wfds, NULL, &timeout, PSNET_TYPE_UNRELIABLE) == SOCKET_ERROR ) {
#endif
                ml_printf("Error on blocking select for write %d", WSAGetLastError() );
                return 0;
        }

        // if the write file descriptor is not set, then bail!
        if ( !FD_ISSET(send_sock, &wfds ) ){
                return 0;
        }

        ret = SOCKET_ERROR;
        switch ( who_to->type ) {
                case NET_TCP:
                        sockaddr.sin_family = AF_INET; 
                        memcpy(&sockaddr.sin_addr.s_addr, iaddr, 4);
                        sockaddr.sin_port = htons(port); 

                        multi_rate_add(np_index, "udp(h)", send_len + UDP_HEADER_SIZE);
                        multi_rate_add(np_index, "udp", send_len);
                        ret = SENDTO( send_sock, (char *)send_data, send_len, 0, (SOCKADDR*)&sockaddr, sizeof(sockaddr), PSNET_TYPE_UNRELIABLE );
                        break;

                default:
                        Assert(0);      // unknown protocol
                        break;

        } // end switch

        if ( ret != SOCKET_ERROR )      {
                return 1;
        }
        return 0;
}

int psnet_get( void * data, net_addr * from_addr )
{                                       
        int buffer_size;

        // try and get a free buffer and return its size
        if(psnet_buffer_get_next(&Psnet_top_buffers[PSNET_TYPE_UNRELIABLE], (ubyte*)data, &buffer_size, from_addr)){
                return buffer_size;
        }

        // return nothing
        return 0;
}

int psnet_broadcast( net_addr * who_to, void * data, int len )
{
        if ( Network_status != NETWORK_STATUS_RUNNING ) {
                ml_string("Network ==> Socket not inited in psnet_broadcast");
                return 0;
        }

        if ( !Can_broadcast ) {
                ml_string("Cannot broadcast -- returning without doing anything");
                return 0;
        }

        ubyte broadcast[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

        // broadcasting works on a local subnet which is all we really want to do for now anyway.
        // we might keep this in as an option for freespace later.
        switch ( who_to->type ) {
                case NET_TCP:
                        memcpy(who_to->addr, broadcast, 6);
                        psnet_send(who_to, data, len);
                        break;
        
        } // end switch

        return 1;
}

void psnet_flush()
{
        ubyte data[MAX_TOP_LAYER_PACKET_SIZE + 250];
        net_addr from_addr;

        while ( psnet_get( data, &from_addr ) > 0 ) ;
}

int psnet_is_valid_ip_string( char *ip_string, int allow_port )
{
        in_addr addr;
        struct hostent *host_ent;
        char str[255], *c;

        // our addresses may have ports, so make local copy and remove port number
        Assert( strlen(ip_string) < 255 );
        strcpy_s(str, ip_string);
        c = strrchr(str, ':');
        if ( c ){
                *c = '\0';
        }       

        addr.s_addr = inet_addr(ip_string);
        if ( addr.s_addr != INADDR_NONE ){
                // make sure the ip string is a valid format string
                if(psnet_is_valid_numeric_ip(ip_string)){
                        return 1;
                }
        }

        // try name resolution
        host_ent = gethostbyname( ip_string );
        if ( !host_ent ){
                return 0;
        }

        // valid host entry so return 1;
        return 1;
}


// -------------------------------------------------------------------------------------------------------
// PSNET 2 RELIABLE SOCKET FUNCTIONS
//

void psnet_rel_send_ack(SOCKADDR *raddr, unsigned int sig, ubyte link_type, float time_sent)
{
        int ret, sig_tmp;
        reliable_header ack_header;
        ack_header.type = RNT_ACK;      
        ack_header.data_len = sizeof(unsigned int);
        ack_header.send_time = time_sent;
        ack_header.send_time = INTEL_FLOAT(&ack_header.send_time);
        sig_tmp = INTEL_INT(sig);
        memcpy(&ack_header.data,&sig_tmp,sizeof(unsigned int));
        switch (link_type) {
        case NET_TCP:
                if(!Tcp_active){
                        ml_string("No TCP in rel_send_ack()");
                        return;
                }
                ret = SENDTO(Unreliable_socket, (char *)&ack_header, RELIABLE_PACKET_HEADER_ONLY_SIZE+ack_header.data_len, 0, raddr, sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);
                if (ret == -1) {
                        ml_string("TCP SENDTO failed in rel_send_ack()");
                }
                break;
        default:                
                ml_string("Unknown protocol type in nw_SendReliable()");
                break;
        }       
}

void psnet_rel_close_socket( PSNET_SOCKET_RELIABLE *sockp )
{
        reliable_header diss_conn_header;

        // if the socket is out of range
        if (*sockp >= MAXRELIABLESOCKETS) {
                if (*sockp != INVALID_SOCKET) {
                        ml_printf("Invalid socket id passed to nw_NewCloseSocket() -- %d",*sockp);
                }

                return;
        }       

        ml_printf("Closing socket %d",*sockp);
        
        // go through every buffer and "free it up(tm)"
        int i;
        for(i=0;i<MAXNETBUFFERS;i++){
                if(Reliable_sockets[*sockp].rbuffers[i]){
                        if(Reliable_sockets[*sockp].rbuffers[i] != NULL){
                                vm_free(Reliable_sockets[*sockp].rbuffers[i]);
                        }
                        Reliable_sockets[*sockp].rbuffers[i] = NULL;
                        Reliable_sockets[*sockp].rsequence[i] = 0;
                }
                if(Reliable_sockets[*sockp].sbuffers[i]){
                        if(Reliable_sockets[*sockp].sbuffers[i] != NULL){
                                vm_free(Reliable_sockets[*sockp].sbuffers[i]);
                        }
                        Reliable_sockets[*sockp].sbuffers[i] = NULL;
                        Reliable_sockets[*sockp].rsequence[i] = 0;
                }
        }

        // send a disconnect packet to the socket on the other end
        diss_conn_header.type = RNT_DISCONNECT;
        diss_conn_header.seq = CONNECTSEQ;
        diss_conn_header.data_len = 0;
        if(*sockp==Serverconn){
                Serverconn = 0xffffffff;
        }
        switch ( Reliable_sockets[*sockp].connection_type ) {
                case NET_TCP:
                        if(!Tcp_active){
                                return;
                        }
                        SENDTO(Unreliable_socket, (char *)&diss_conn_header,RELIABLE_PACKET_HEADER_ONLY_SIZE,0,&Reliable_sockets[*sockp].addr,sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);
                        break;
                default:
                        ml_string("Unknown protocol type in nw_CloseSocket()!");                        
                        break;
        }
        memset(&Reliable_sockets[*sockp],0,sizeof(reliable_socket));
        Reliable_sockets[*sockp].status = RNF_UNUSED;   
}

// function to check the status of the reliable socket and try to re-initialize it if necessary.
// win95 seems to have trouble doing a reinit of the socket immediately after close, so this
// function exists to check the status, and reinitialize if we need to
int psnet_rel_check()
{
        return 1;
}

int psnet_rel_send(PSNET_SOCKET_RELIABLE socketid, ubyte *data, int length, int np_index)
{               
        int i;
        int bytesout = 0;
        reliable_socket *rsocket;       
        
        if(socketid >= MAXRELIABLESOCKETS){
                ml_printf("Invalid socket id passed to psnet_rel_send() -- %d",socketid);
                return -1;
        }

        Assert(length < (int)sizeof(reliable_header));
        psnet_rel_work();

        rsocket=&Reliable_sockets[socketid];
        if(rsocket->status!=RNF_CONNECTED) {
                //We can't send because this isn't a connected reliable socket.
                ml_printf("Can't send packet because of status %d in nw_SendReliable(). socket = %d",rsocket->status,socketid);
                return -1;
        }
        
        // Add the new packet to the sending list and send it.
        for(i=0;i<MAXNETBUFFERS;i++){
                if(NULL==rsocket->sbuffers[i]){                 
                        reliable_header send_header;
                        int send_this_packet=1;                 
                        
                        rsocket->send_len[i] = length;
                        rsocket->sbuffers[i] = (reliable_net_sendbuffer *)vm_malloc(sizeof(reliable_net_sendbuffer));
                
                        memcpy(rsocket->sbuffers[i]->buffer,data,length);       

                        send_header.seq = INTEL_SHORT( rsocket->theirsequence );
                        rsocket->ssequence[i] = rsocket->theirsequence;
                        
                        memcpy(send_header.data,data,length);
                        send_header.data_len = INTEL_SHORT( (ushort)length );
                        send_header.type = RNT_DATA;
                        send_header.send_time = psnet_get_time();
                        send_header.send_time = INTEL_FLOAT( &send_header.send_time ) ;
                                        
                        if (send_this_packet){
                                switch ( rsocket->connection_type ){
                                        case NET_TCP:
                                                if(!Tcp_active){
                                                        return 0;
                                                }
                                                multi_rate_add(np_index, "tcp(h)", RELIABLE_PACKET_HEADER_ONLY_SIZE+rsocket->send_len[i]);
                                                bytesout = SENDTO(Unreliable_socket, (char *)&send_header,RELIABLE_PACKET_HEADER_ONLY_SIZE+rsocket->send_len[i],0,&rsocket->addr,sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);
                                                break;
                                        default:
                                                ml_string("Unknown protocol type in nw_SendReliable()!");
                                                Int3();
                                                break;
                                }               
                        }

                        if((bytesout==SOCKET_ERROR)&&(WSAEWOULDBLOCK==WSAGetLastError())){
                                //This will cause it to try to send again next frame. (or sooner)
                                rsocket->timesent[i] = psnet_get_time()-(NETRETRYTIME*4);
                        } else {
                                rsocket->timesent[i] = psnet_get_time();
                        }
                        
                                                
                        rsocket->theirsequence++;
                        return bytesout;
                }
        }
        ml_printf("PSNET RELIABLE SEND BUFFER OVERRUN. socket = %d",socketid);  
        return 0;
}

// Return codes:
// -1 socket not connected
// 0 No packet ready to receive
// >0 Buffer filled with the number of bytes recieved
int psnet_rel_get(PSNET_SOCKET socketid, ubyte *buffer, int max_len)
{       
        int i;
        
        reliable_socket *rsocket = NULL;
        psnet_rel_work();
        if(socketid >= MAXRELIABLESOCKETS){
                ml_printf("Invalid socket id passed to nw_NewReceiveReliable() -- %d",socketid);
                return -1;
        }
        rsocket = &Reliable_sockets[socketid];
        if( (RNF_CONNECTED!=rsocket->status) && (RNF_LIMBO!=rsocket->status) ){
                ml_printf("Can't receive packet because it isn't connected in nw_ReceiveReliable(). socket = %d",socketid);
                return 0;
        }
        //If the buffer position is the position we are waiting for, fill in 
        //the buffer we received in the call to this function and return true                   

        for(i=0; i<MAXNETBUFFERS; i++){
                if((rsocket->rsequence[i] == rsocket->oursequence) && rsocket->rbuffers[i]){
                        memcpy(buffer,rsocket->rbuffers[i]->buffer, rsocket->recv_len[i]);
                        vm_free(rsocket->rbuffers[i]);
                        rsocket->rbuffers[i] = NULL;
                        rsocket->rsequence[i] = 0;                      
                        rsocket->oursequence++;
                        return rsocket->recv_len[i];
                }
        }

        return 0;       
}

void psnet_rel_work()
{
        int i,j;
        int rcode = -1;
        int max_len = NETBUFFERSIZE;
        fd_set read_fds;                   
        TIMEVAL timeout; 
        static reliable_header rcv_buff;
        static SOCKADDR rcv_addr;
        int bytesin = 0;
        int addrlen = sizeof(SOCKADDR);
        timeout.tv_sec=0;            
        timeout.tv_usec=0;

        PSNET_TOP_LAYER_PROCESS();
                
        // negotitate initial connection with the server
        reliable_socket *rsocket = NULL;
        if(Serverconn != 0xffffffff){
                //Check to see if we need to send a packet out.
                if((Reliable_sockets[Serverconn].status==RNF_LIMBO) && ((Serverconn != 0xffffffff) && fl_abs((psnet_get_time() - Last_sent_iamhere))>NETRETRYTIME) ){
                        reliable_header conn_header;
                        //Now send I_AM_HERE packet
                        conn_header.type = RNT_I_AM_HERE;
                        conn_header.seq = (ushort)(~CONNECTSEQ);
                        conn_header.data_len = 0;
                        Last_sent_iamhere = psnet_get_time();
                        int ret = SOCKET_ERROR;
                        switch ( Reliable_sockets[Serverconn].connection_type ) {
                        case NET_TCP:
                                if(!Tcp_active){
                                        ml_string("Unable to use this network connection type in nw_WorkReliable()");
                                        Int3();
                                        return;
                                }
                                ret = SENDTO(Unreliable_socket, (char *)&conn_header,RELIABLE_PACKET_HEADER_ONLY_SIZE,0,&Reliable_sockets[Serverconn].addr,sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);
                                break;
                        default:
                                ml_string("Unknown protocol type in nw_WorkReliable()!");
                                Int3();
                                break;
                        }

                        if((ret == SOCKET_ERROR) && (WSAEWOULDBLOCK == WSAGetLastError())){
                                Reliable_sockets[Serverconn].last_packet_sent = psnet_get_time()-NETRETRYTIME;
                        } else {
                                Reliable_sockets[Serverconn].last_packet_sent = psnet_get_time();
                        }
                }
        }

        ubyte link_type;
        net_addr d3_rcv_addr;
        SOCKADDR_IN *rcvaddr;
        int udp_has_data = 0;
        do {            
                rsocket = NULL;
                //Check UDP
                if(Tcp_active && (Socket_type == NET_TCP)){
                        FD_ZERO(&read_fds);
                        FD_SET(Unreliable_socket, &read_fds);    
#ifdef _WIN32
                        udp_has_data = SELECT(0,&read_fds,NULL,NULL,&timeout, PSNET_TYPE_RELIABLE);
#else
                        udp_has_data = SELECT(Unreliable_socket+1, &read_fds,NULL,NULL,&timeout, PSNET_TYPE_RELIABLE);
#endif
                }
                bytesin = 0;
                addrlen = sizeof(SOCKADDR);

      if(udp_has_data){
                        SOCKADDR_IN *tcp_addr = (SOCKADDR_IN *)&rcv_addr;
                        memset(&d3_rcv_addr,0,sizeof(net_addr));
                        memset(&rcv_addr,0,sizeof(SOCKADDR));
                        bytesin = RECVFROM(Unreliable_socket, (char *)&rcv_buff,sizeof(reliable_header), 0, (SOCKADDR *)&rcv_addr,&addrlen, PSNET_TYPE_RELIABLE);
                        rcv_buff.seq = INTEL_SHORT( rcv_buff.seq ); //-V570
                        rcv_buff.data_len = INTEL_SHORT( rcv_buff.data_len ); //-V570
                        rcv_buff.send_time = INTEL_FLOAT( &rcv_buff.send_time );
                        memcpy(d3_rcv_addr.addr, &tcp_addr->sin_addr.s_addr, 4); //-V512
                        d3_rcv_addr.port = tcp_addr->sin_port;
                        d3_rcv_addr.type = NET_TCP;
                        link_type = NET_TCP;
                } else {
                        //Neither socket had data waiting
                        break;
                }               

                if(bytesin==-1){
                        ml_printf("recvfrom returned an error! -- %d",WSAGetLastError());                       
                        return;
                }
                if(bytesin){
                        //Someone wants to connect, so find a slot
                        if(rcv_buff.type == RNT_REQ_CONN){
                                for(i=1; i<MAXRELIABLESOCKETS; i++){
                                        if( (Reliable_sockets[i].status == RNF_CONNECTED) || (Reliable_sockets[i].status == RNF_LIMBO) ){
                                                if(memcmp(&d3_rcv_addr, &Reliable_sockets[i].m_net_addr, sizeof(net_addr)) == 0){
                                                        //We already have a reliable link to this user, so we will ignore it...
                                                        ml_printf("Received duplicate connection request. %d",i);
                                                        psnet_rel_send_ack(&Reliable_sockets[i].addr, rcv_buff.seq, link_type, rcv_buff.send_time);
                                                        //We will change this as a hack to prevent later code from hooking us up
                                                        rcv_buff.type = 0xff;
                                                        continue;
                                                }
                                        }
                                }
                                for(i=1; i<MAXRELIABLESOCKETS; i++){
                                        if(Reliable_sockets[i].status == RNF_UNUSED){
                                                //Add the new connection here.
                                                Reliable_sockets[i].connection_type=link_type;
                                                memcpy(&Reliable_sockets[i].m_net_addr, &d3_rcv_addr, sizeof(net_addr));
                                                memcpy(&Reliable_sockets[i].addr ,&rcv_addr, sizeof(SOCKADDR));
                                                Reliable_sockets[i].ping_pos = 0;
                                                Reliable_sockets[i].num_ping_samples = 0;
                                                Reliable_sockets[i].status = RNF_LIMBO;
                                                Reliable_sockets[i].last_packet_received = psnet_get_time();
                                                rsocket = &Reliable_sockets[i];
                                                rcvaddr = (SOCKADDR_IN *)&rcv_addr;
                                                ml_printf("Connect from %s:%d", inet_ntoa(rcvaddr->sin_addr), htons(rcvaddr->sin_port));
                                                break;
                                        }
                                }
                                if(i==MAXRELIABLESOCKETS){
                                        //No more connections!
                                        ml_string("Out of incoming reliable connection sockets");
                                        continue;
                                }
                                psnet_rel_send_ack(&rsocket->addr, rcv_buff.seq, link_type, rcv_buff.send_time);                        
                        }
                        
                        //Find out if this is a packet from someone we were expecting a packet.
                        rcvaddr = (SOCKADDR_IN *)&rcv_addr;
                        for(i=1; i<MAXRELIABLESOCKETS; i++){
                                if(memcmp(&d3_rcv_addr,&Reliable_sockets[i].m_net_addr,sizeof(net_addr)) == 0){
                                        rsocket=&Reliable_sockets[i];
                                        break;
                                }                               
                        }
                        if(NULL == rsocket){
                                ml_string("Received reliable data from unconnected client.");
                                ml_printf("Received from %s:%d\n",inet_ntoa(rcvaddr->sin_addr),rcvaddr->sin_port);
                                continue ;
                        }
                        rsocket->last_packet_received = psnet_get_time();
                        
                        if(rsocket->status != RNF_CONNECTED){
                                //Get out of limbo
                                if(rsocket->status == RNF_LIMBO){
                                        //this is our connection to the server
                                        if(Serverconn != 0xffffffff){
                                                if(rcv_buff.type == RNT_ACK){
                                                        ushort *acknum = (ushort *)&rcv_buff.data;
                                                        if(*acknum == (~CONNECTSEQ & 0xffff)){
                                                                rsocket->status = RNF_CONNECTED;
                                                                ml_string("Got ACK for IAMHERE!");
                                                        }
                                                        continue;
                                                }
                                        } else if(rcv_buff.type == RNT_I_AM_HERE){
                                                rsocket->status = RNF_CONNECTING;
                                                psnet_rel_send_ack(&rsocket->addr, rcv_buff.seq, link_type, rcv_buff.send_time);                
                                                ml_string("Got IAMHERE!");
                                                continue;
                                        }
                                }
                                if((rcv_buff.type == RNT_DATA) && (Serverconn != 0xffffffff)){
                                        rsocket->status = RNF_CONNECTED;
                                } else {                                        
                                        rsocket->last_packet_received = psnet_get_time();
                                        continue;
                                }                               
                        }
                        //Update the last recv variable so we don't need a heartbeat
                        rsocket->last_packet_received = psnet_get_time();

                        if(rcv_buff.type == RNT_HEARTBEAT){
                                continue;
                        }
                        if(rcv_buff.type == RNT_ACK){
                                //Update ping time
                                rsocket->num_ping_samples++;
                                
                                rsocket->pings[rsocket->ping_pos] = rsocket->last_packet_received - rcv_buff.send_time;                         
                                if(rsocket->num_ping_samples >= MAX_PING_HISTORY){
                                        float sort_ping[MAX_PING_HISTORY];
                                        for(int a=0;a<MAX_PING_HISTORY;a++){
                                                sort_ping[a] = rsocket->pings[a];
                                        }

                                        std::sort(sort_ping, sort_ping + MAX_PING_HISTORY);
                                        rsocket->mean_ping = ((sort_ping[MAX_PING_HISTORY/2]+sort_ping[(MAX_PING_HISTORY/2)+1]))/2;                                     
                                }
                                rsocket->ping_pos++;
                                if(rsocket->ping_pos >= MAX_PING_HISTORY){
                                        rsocket->ping_pos=0;                            
                                }

                                // if this is an ack for a send buffer on the socket, kill the send buffer. its done
                                for(i=0; i<MAXNETBUFFERS; i++){
                                        unsigned int *acksig = (unsigned int *)&rcv_buff.data;
                                        if(rsocket){
                                                if(rsocket->sbuffers[i]){
                                                        if(rsocket->ssequence[i] == INTEL_INT(*acksig)){                                                                
                                                                Assert(rsocket->sbuffers[i] != NULL);
                                                                vm_free(rsocket->sbuffers[i]);
                                                                rsocket->sbuffers[i] = NULL;    
                                                                rsocket->ssequence[i] = 0;
                                                        }
                                                }
                                        }
                                }
                                //remove that packet from the send buffer
                                rsocket->last_packet_received = psnet_get_time();
                                continue;
                        }

                        if(rcv_buff.type == RNT_DATA_COMP){
                                //More2Come
                                //Decompress it. Put it back in the buffer. Process it as RNT_DATA
                                rcv_buff.type = RNT_DATA;
                        }
                        if(rcv_buff.type == RNT_DATA){                          
                                //If the data is out of order by >= MAXNETBUFFERS-1 ignore that packet for now
                                int seqdelta;
                                seqdelta = rcv_buff.seq - rsocket->oursequence;
                                if(seqdelta<0) seqdelta = seqdelta*-1;
                                if(seqdelta>=MAXNETBUFFERS - 1){
                                        ml_string("Received reliable packet out of order!");
                                        //It's out of order, so we won't ack it, which will mean we will get it again soon.
                                        continue;
                                }
                                //else move data into the proper buffer position
                                int savepacket=1;
                                
                                if(rsocket->oursequence < (0xffff - (MAXNETBUFFERS-1))){
                                        if (rsocket->oursequence > rcv_buff.seq){
                                                savepacket = 0;
                                        }
                                } else {
                                        //Sequence is high, so prepare for wrap around
                                        if( ((unsigned short)(rcv_buff.seq + rsocket->oursequence)) > (MAXNETBUFFERS-1)){
                                                savepacket = 0; 
                                        }
                                }

                                for(i=0; i<MAXNETBUFFERS; i++){
                                        if( (NULL != rsocket->rbuffers[i]) && (rsocket->rsequence[i] == rcv_buff.seq)){
                                                //Received duplicate packet!                                            
                                                savepacket = 0;
                                        }
                                }
                                if(savepacket){
                                        if(rcv_buff.data_len>max_len){
                                                ml_string("Received oversized reliable packet!");
                                                //don't ack it, which will mean we will get it again soon.
                                                continue;
                                        } 
                                        for(i=0; i<MAXNETBUFFERS; i++){
                                                if(NULL == rsocket->rbuffers[i]){                                                       
                                                        rsocket->recv_len[i] = rcv_buff.data_len; 
                                                        rsocket->rbuffers[i] = (reliable_net_rcvbuffer *)vm_malloc(sizeof(reliable_net_rcvbuffer));
                                                        memcpy(rsocket->rbuffers[i]->buffer,rcv_buff.data,rsocket->recv_len[i]);        
                                                        rsocket->rsequence[i] = rcv_buff.seq;                                                   
                                                        break;
                                                }
                                        }
                                }
                                psnet_rel_send_ack(&rsocket->addr, rcv_buff.seq, link_type, rcv_buff.send_time);                
                        }
                        
                }
        } while (udp_has_data>0);
        
        // Go through each reliable socket that is connected and do any needed work.
        for(j=0; j<MAXRELIABLESOCKETS; j++){
                rsocket=&Reliable_sockets[j];

                if(Serverconn == 0xffffffff){
                        if(rsocket->status==RNF_LIMBO){
                                if(fl_abs((psnet_get_time() - rsocket->last_packet_received))>Nettimeout){
                                        ml_printf("Reliable (but in limbo) socket (%d) timed out in nw_WorkReliable().",j);
                                        memset(rsocket,0,sizeof(reliable_socket));
                                        rsocket->status = RNF_UNUSED;//Won't work if this is an outgoing connection.
                                }
                        }
                } else {
                        if((rsocket->status == RNF_LIMBO) && (fl_abs((psnet_get_time() - First_sent_iamhere)) > Nettimeout)){
                                rsocket->status = RNF_BROKEN;
                                ml_printf("Reliable socket (%d) timed out in nw_WorkReliable().",j);
                        }
                }
                
                if(rsocket->status == RNF_CONNECTED){
                        float retry_packet_time;
                        if((rsocket->mean_ping==0) || (rsocket->mean_ping > (NETRETRYTIME*4))){
                                retry_packet_time = NETRETRYTIME;
                        } else {
                                if(rsocket->mean_ping<MIN_NET_RETRYTIME) {
                                        retry_packet_time = (float)MIN_NET_RETRYTIME;                                   
                                } else {
                                        retry_packet_time = ((float)(float)rsocket->mean_ping * (float)1.25);                                   
                                }
                        }
                        //Iterate through send buffers.  
                        for(i=0;i<MAXNETBUFFERS;i++){
                                // send again
                                if((rsocket->sbuffers[i]) && (fl_abs((psnet_get_time() - rsocket->timesent[i])) >= retry_packet_time)) {
                                        reliable_header send_header;                                    
                                        send_header.send_time = psnet_get_time();
                                        send_header.send_time = INTEL_FLOAT( &send_header.send_time );
                                        send_header.seq = INTEL_SHORT( rsocket->ssequence[i] );
                                        memcpy(send_header.data,rsocket->sbuffers[i]->buffer,rsocket->send_len[i]);
                                        send_header.data_len = INTEL_SHORT( (ushort)rsocket->send_len[i] );
                                        send_header.type = RNT_DATA;
                                        rcode = SENDTO(Unreliable_socket, (char *)&send_header, RELIABLE_PACKET_HEADER_ONLY_SIZE + rsocket->send_len[i], 0, &rsocket->addr, sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);

                                        if((rcode == SOCKET_ERROR) && (WSAEWOULDBLOCK == WSAGetLastError())){
                                                //The packet didn't get sent, flag it to try again next frame
                                                rsocket->timesent[i] = psnet_get_time()-(NETRETRYTIME*4);
                                        } else {
                                                rsocket->last_packet_sent = psnet_get_time();
                                                rsocket->timesent[i] = psnet_get_time();
                                        }
                                        
                                }//getcwd
                        }

                        if((rsocket->status == RNF_CONNECTED) && (fl_abs((psnet_get_time() - rsocket->last_packet_sent)) > NETHEARTBEATTIME)) {
                                reliable_header send_header;                            
                                send_header.send_time = psnet_get_time();
                                send_header.send_time = INTEL_FLOAT( &send_header.send_time );
                                send_header.seq = 0;
                                send_header.data_len = 0;
                                send_header.type = RNT_HEARTBEAT;

                                rcode = SENDTO(Unreliable_socket, (char *)&send_header, RELIABLE_PACKET_HEADER_ONLY_SIZE, 0, &rsocket->addr, sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);

                                if((rcode != SOCKET_ERROR) && (WSAEWOULDBLOCK != WSAGetLastError())){
                                        //It must have been sent
                                        rsocket->last_packet_sent = psnet_get_time();
                                }
                        }

                        if((rsocket->status == RNF_CONNECTED) && (fl_abs((psnet_get_time() - rsocket->last_packet_received))>Nettimeout)){
                                //This socket is hosed.....inform someone?
                                ml_printf("Reliable Socket (%d) timed out in nw_WorkReliable().",j);
                                rsocket->status = RNF_BROKEN;
                        }
                }
        }       
}

int psnet_rel_get_status(PSNET_SOCKET_RELIABLE socketid)
{       
        if(socketid >= MAXRELIABLESOCKETS){             
                return -1;
        }

        return Reliable_sockets[socketid].status;
}

int psnet_rel_check_for_listen(net_addr *from_addr)
{       
        SOCKADDR_IN *ip_addr;                           // UDP/TCP socket structure
        
        psnet_rel_work();
        int i;
        for(i=1; i<MAXRELIABLESOCKETS; i++){
                if(Reliable_sockets[i].status == RNF_CONNECTING){
                        Reliable_sockets[i].status = RNF_CONNECTED;
                        ml_string("New reliable connection in nw_CheckListenSocket().");
                        
                        switch ( Reliable_sockets[i].connection_type ){
                        case NET_TCP:
                                ip_addr = (SOCKADDR_IN *)&Reliable_sockets[i].addr;
                                memset(from_addr, 0x00, sizeof(net_addr));
                                from_addr->port = ntohs( ip_addr->sin_port );
                                from_addr->type = NET_TCP;
#ifdef _WIN32
                                memcpy(from_addr->addr, &ip_addr->sin_addr.S_un.S_addr, 4); //-V512
#else
                                memcpy(from_addr->addr, &ip_addr->sin_addr.s_addr, 4); //-V512
#endif
                                break;
                        
                        default:
                                Int3();
                                break;
                        }
                        return i;
                }
        }
        return INVALID_SOCKET;  
}

void psnet_rel_connect_to_server(PSNET_SOCKET *socket, net_addr *server_addr)
{       
        //Send out a RNT_REQ_CONN packet, and wait for it to be acked.
        SOCKADDR_IN sockaddr;                           // UDP/TCP socket structure
        SOCKADDR *addr;                                         // pointer to SOCKADDR to make coding easier
        SOCKADDR rcv_addr;
        int addrlen;
        ubyte iaddr[6];
        ushort port;
        float first_sent_req = 0;
        static reliable_header conn_header;
        static reliable_header ack_header;
        int bytesin;
        struct timeval timeout;
        fd_set read_fds;
        int i;
        *socket = INVALID_SOCKET;       
        
        memset(iaddr, 0x00, 6);
        memcpy(iaddr, &server_addr->addr, 6);
        port = (ushort)(server_addr->port);     // Talk to the server listen port
        
        conn_header.type = RNT_REQ_CONN;
        conn_header.seq = CONNECTSEQ;
        conn_header.data_len = 0;
        
        timeout.tv_sec=0;            
        timeout.tv_usec=0;

        if((server_addr->type == NET_TCP) && (!Tcp_active)){
                return;
        }
        //Flush out any left overs
        if(Tcp_active && (Socket_type == NET_TCP)){
                FD_ZERO(&read_fds);
                FD_SET(Unreliable_socket, &read_fds);    
#ifdef _WIN32
                while(SELECT(0, &read_fds, NULL, NULL, &timeout, PSNET_TYPE_RELIABLE)){
#else
                while(SELECT(Unreliable_socket+1, &read_fds, NULL, NULL, &timeout, PSNET_TYPE_RELIABLE)){
#endif
                        addrlen = sizeof(SOCKADDR);
                        bytesin = RECVFROM(Unreliable_socket, (char *)&ack_header,sizeof(reliable_header),0,(SOCKADDR *)&rcv_addr,&addrlen, PSNET_TYPE_RELIABLE);
                        if(bytesin==-1){
                                ml_printf("UDP recvfrom returned an error! -- %d",WSAGetLastError());
                                break;
                        }
                        FD_ZERO(&read_fds);
                        FD_SET(Unreliable_socket, &read_fds);    
                }
        }
        memset(&ack_header,0,sizeof(reliable_header));
        bytesin = 0;
        SOCKET typeless_sock;
        net_addr d3_rcv_addr;
        memset(&d3_rcv_addr,0,sizeof(net_addr));

        switch ( server_addr->type ){
                case NET_TCP:
                        sockaddr.sin_family = AF_INET; 
                        memcpy(&sockaddr.sin_addr.s_addr, iaddr, 4);
                        sockaddr.sin_port = htons(port); 
                        addr = (SOCKADDR *)&sockaddr;
                        if( SOCKET_ERROR == SENDTO(Unreliable_socket, (char *)&conn_header,RELIABLE_PACKET_HEADER_ONLY_SIZE,0,addr,sizeof(SOCKADDR), PSNET_TYPE_RELIABLE) ){
                                ml_printf("Unable to send UDP packet in nw_ConnectToServer()! -- %d",WSAGetLastError());
                                return;
                        }
                        memcpy(d3_rcv_addr.addr, &sockaddr.sin_addr.s_addr, 4); //-V512
                        d3_rcv_addr.port = sockaddr.sin_port;
                        d3_rcv_addr.type = NET_TCP;
                        typeless_sock = Unreliable_socket;
                        break;

                default:
                        ml_string("Unknown protocol type in nw_ConnectToServer()!");
                        Int3();
                        return;
        }               

        
        first_sent_req = psnet_get_time();
        
        //Wait until we get a response from the server or we timeout
        
        do {
                PSNET_TOP_LAYER_PROCESS();

                FD_ZERO(&read_fds);
                FD_SET(typeless_sock, &read_fds);               
#ifdef _WIN32
                if(SELECT(0, &read_fds, NULL,NULL,&timeout, PSNET_TYPE_RELIABLE)){
#else
                if(SELECT(typeless_sock+1, &read_fds, NULL,NULL,&timeout, PSNET_TYPE_RELIABLE)){
#endif
                        ml_string("selected() in psnet_rel_connect_to_server()");

                        addrlen = sizeof(SOCKADDR);
                        bytesin = RECVFROM(typeless_sock,(char *)&ack_header,sizeof(reliable_header),0,(SOCKADDR *)&rcv_addr,&addrlen, PSNET_TYPE_RELIABLE);
                        if(bytesin==-1){
                                ml_printf("recvfrom returned an error! -- %d",WSAGetLastError());
                                Int3();
                                return;                         
                        }
                        
                        ml_string("received data after select in psnet_rel_connect_to_server()");
                        if(bytesin){    
                                ml_string("about to check ack_header.type");
                                if(ack_header.type == RNT_ACK){
                                        short *acknum = (short *)&ack_header.data;
                                        if(*acknum == CONNECTSEQ){                                              
                                                for(i=1; i<MAXRELIABLESOCKETS; i++){
                                                        if(Reliable_sockets[i].status==RNF_UNUSED){
                                                                //Add the new connection here.
                                                                memset(&Reliable_sockets[i],0,sizeof(reliable_socket));
                                                                Reliable_sockets[i].connection_type = (ubyte)server_addr->type;
                                                                memcpy(&Reliable_sockets[i].m_net_addr,&d3_rcv_addr,sizeof(net_addr));
                                                                Reliable_sockets[i].last_packet_received = psnet_get_time();
                                                                memcpy(&Reliable_sockets[i].addr,&rcv_addr,sizeof(SOCKADDR));
                                                                Reliable_sockets[i].status = RNF_LIMBO;
                                                                *socket = i;
                                                                ml_string("Successfully connected to server in nw_ConnectToServer().");
                                                                //Now send I_AM_HERE packet
                                                                conn_header.type = RNT_I_AM_HERE;
                                                                conn_header.seq = (ushort)(~CONNECTSEQ);
                                                                conn_header.data_len = 0;
                                                                Serverconn = i;
                                                                First_sent_iamhere = psnet_get_time();
                                                                Last_sent_iamhere = psnet_get_time();
                                                                int rcode = SENDTO(typeless_sock,(char *)&conn_header,RELIABLE_PACKET_HEADER_ONLY_SIZE,0,addr,sizeof(SOCKADDR), PSNET_TYPE_RELIABLE);
                                                                if(rcode == SOCKET_ERROR){
                                                                        *socket = INVALID_SOCKET;
                                                                        Reliable_sockets[i].status = RNF_UNUSED;
                                                                        memset(&Reliable_sockets[i],0,sizeof(reliable_socket));
                                                                        ml_string("Unable to send packet in nw_ConnectToServer()");
                                                                        return;
                                                                }
                                                                Reliable_sockets[i].last_packet_sent = psnet_get_time();
                                                                float f;
                                                                f = psnet_get_time();
                                                                while((fl_abs((psnet_get_time() - f))<2) && (Reliable_sockets[i].status != RNF_CONNECTING)){
                                                                        psnet_rel_work();
                                                                }
                                                                        
                                                                return;
                                                        }
                                                }
                                                ml_string("Out of reliable socket space in nw_ConnectToServer().");
                                                return;                                         
                                        } else ml_string("Received out of sequence ACK in nw_ConnectToServer().");
                                } else ml_string("Received something that isn't an ACK in nw_ConnectToServer().");
                        } else ml_string("Received 0 bytes from recvfrom() in nw_ConnectToServer().");
                }
        } while(fl_abs((psnet_get_time() - first_sent_req)) < RELIABLE_CONNECT_TIME);   
}

int psnet_get_ip()
{       
        SOCKADDR_IN local_address;

#ifdef _WIN32
        if(Psnet_connection == NETWORK_CONNECTION_DIALUP){      
                local_address.sin_addr.s_addr = psnet_ras_status();
                if(local_address.sin_addr.s_addr == INADDR_NONE){
                        local_address.sin_addr.s_addr = INADDR_ANY;
                }
        } 
        else
#endif   // FIXME - always returns INADDR_ANY for LAN
        {
                // Init local address to zero
                local_address.sin_addr.s_addr = INADDR_ANY;                     
        }

        ml_printf("psnet_get_ip() reports IP : %s", inet_ntoa(local_address.sin_addr));
        
        return local_address.sin_addr.s_addr;
}

int psnet_init_rel_tcp(int port, int should_listen)
{
        // success
        return 1;
}

void psnet_rel_close()
{
        int idx;
        PSNET_SOCKET_RELIABLE sock;

        // kill all sockets
        for(idx=0; idx<MAXRELIABLESOCKETS; idx++){
                if(Reliable_sockets[idx].status != RNF_UNUSED){
                        sock = idx;
                        psnet_rel_close_socket(&sock);
                }
        }
}

// ------------------------------------------------------------------------------------------------------
// PACKET BUFFERING FUNCTIONS
//

void psnet_buffer_init(network_packet_buffer_list *l)
{
        int idx;
        
        // blast the buffer clean
        memset(l->psnet_buffers, 0, sizeof(network_packet_buffer) * MAX_PACKET_BUFFERS);
        
        // set all buffer sequence #'s to -1
        for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){                
                l->psnet_buffers[idx].sequence_number = -1;
        }

        // initialize the sequence #
        l->psnet_seq_number = 0;
        l->psnet_lowest_id = -1;
        l->psnet_highest_id = -1;
}

void psnet_buffer_packet(network_packet_buffer_list *l, ubyte *data, int length, net_addr *from)
{
        int idx;
        int found_buf = 0;
        
        // find the first empty packet
        for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){
                if(l->psnet_buffers[idx].sequence_number == -1){
                        found_buf = 1;
                        break;
                }
        }

        // if we didn't find the buffer, report an overrun
        if(!found_buf){
                ml_string("WARNING - Buffer overrun in psnet");
        } else {
                // copy in the data
                memcpy(l->psnet_buffers[idx].data, data, length);
                l->psnet_buffers[idx].len = length;
                memcpy(&l->psnet_buffers[idx].from_addr, from, sizeof(net_addr));
                l->psnet_buffers[idx].sequence_number = l->psnet_seq_number;
                
                // keep track of the highest id#
                l->psnet_highest_id = l->psnet_seq_number++;

                // set the lowest id# for the first time
                if(l->psnet_lowest_id == -1){
                        l->psnet_lowest_id = l->psnet_highest_id;
                }
        }
}

int psnet_buffer_get_next(network_packet_buffer_list *l, ubyte *data, int *length, net_addr *from)
{       
        int idx;
        int found_buf = 0;

        // if there are no buffers, do nothing
        if((l->psnet_lowest_id == -1) || (l->psnet_lowest_id > l->psnet_highest_id)){
                return 0;
        }

        // search until we find the lowest packet index id#
        for(idx=0;idx<MAX_PACKET_BUFFERS;idx++){
                // if we found the buffer
                if(l->psnet_buffers[idx].sequence_number == l->psnet_lowest_id){
                        found_buf = 1;
                        break;
                }
        }

        // at this point, we should _always_ have found the buffer
        Assert(found_buf);      
        
        // copy out the buffer data
        memcpy(data, l->psnet_buffers[idx].data, l->psnet_buffers[idx].len);
        *length = l->psnet_buffers[idx].len;
        memcpy(from, &l->psnet_buffers[idx].from_addr, sizeof(net_addr));

        // now we need to cleanup the packet list

        // mark the buffer as free
        l->psnet_buffers[idx].sequence_number = -1;
        l->psnet_lowest_id++;

        return 1;
}

// -------------------------------------------------------------------------------------------------------
// PSNET 2 FORWARD DEFINITIONS
//

int psnet_is_valid_numeric_ip(char *ip)
{
        char *token;
        char copy[100];
        int val1,val2,val3,val4;

        // get the first ip value
        strcpy_s(copy,ip);
        token = strtok(copy,".");
        if(token == NULL){
                return 0;
        } else {
                // get the value of the token
                val1 = atoi(token);
                if((val1 < 0) || (val1 > 255)){
                        return 0;
                }
        }

        // second ip value
        token = strtok(NULL,".");
        if(token == NULL){
                return 0;
        } else {
                // get the value of the token
                val2 = atoi(token);
                if((val2 < 0) || (val2 > 255)){
                        return 0;
                }
        }

        // third ip value
        token = strtok(NULL,".");
        if(token == NULL){
                return 0;
        } else {
                // get the value of the token
                val3 = atoi(token);
                if((val3 < 0) || (val3 > 255)){
                        return 0;
                }
        }

        // third ip value
        token = strtok(NULL,"");
        if(token == NULL){
                return 0;
        } else {
                // get the value of the token
                val4 = atoi(token);
                if((val4 < 0) || (val4 > 255)){
                        return 0;
                }
        }

        // make sure he hasn't entered all 0's
        if((val1 == 0) && (val2 == 0) && (val3 == 0) && (val4 == 0)){
                return 0;
        }

        // valid
        return 1;
}

#ifdef _WIN32 // Dial-Up Networking
// function called from high level FreeSpace code to determine the status of the networking
// code returns one of a handful of macros

DWORD (__stdcall *pRasEnumConnections)(LPRASCONN lprasconn, LPDWORD lpcb, LPDWORD lpcConnections) = NULL;
DWORD (__stdcall *pRasGetConnectStatus)(HRASCONN hrasconn, LPRASCONNSTATUS lprasconnstatus ) = NULL;
DWORD (__stdcall *pRasGetProjectionInfo)(HRASCONN hrasconn, RASPROJECTION rasprojection, LPVOID lpprojection, LPDWORD lpcb ) = NULL;

unsigned int psnet_ras_status()
{
        int rval;
        unsigned long size, num_connections, i, valid_connections = 0;
        RASCONN rasbuffer[25];
        HINSTANCE ras_handle;
        unsigned long rasip=0;
        RASPPPIP projection;

        Ras_connected = 0;

        // first, call a LoadLibrary to load the RAS api
        ras_handle = LoadLibrary( "rasapi32.dll" );
        if ( ras_handle == NULL ) {
                return INADDR_ANY;
        }

        pRasEnumConnections = (DWORD (__stdcall *)(LPRASCONN, LPDWORD, LPDWORD))GetProcAddress(ras_handle, "RasEnumConnectionsA");
        if (!pRasEnumConnections)       {
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }
        pRasGetConnectStatus = (DWORD (__stdcall *)(HRASCONN, LPRASCONNSTATUS))GetProcAddress(ras_handle, "RasGetConnectStatusA");
        if (!pRasGetConnectStatus)      {
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }
        pRasGetProjectionInfo = (DWORD (__stdcall *)(HRASCONN, RASPROJECTION, LPVOID, LPDWORD))GetProcAddress(ras_handle, "RasGetProjectionInfoA");
        if (!pRasGetProjectionInfo)     {
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }

        size = sizeof(rasbuffer);
        rasbuffer[0].dwSize = sizeof(RASCONN);

        rval = pRasEnumConnections( rasbuffer, &size, &num_connections );
        if ( rval ) {
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }

        // JAS: My computer gets to this point, but I have no RAS connections,
        // so just exit
        if ( num_connections < 1 )      {
                ml_string("Found no RAS connections");
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }

        ml_printf("Found %d connections", num_connections);

        for (i = 0; i < num_connections; i++ ) {
                RASCONNSTATUS status;
                unsigned long dummySize;

                // don't count VPNs with the non-LAN connections
                if ( !stricmp(rasbuffer[i].szDeviceType, "RASDT_Vpn") ) {
                        continue;
                } else {
                        valid_connections++;
                }

                ml_printf("Connection %d:", i);
                ml_printf("Entry Name: %s", rasbuffer[i].szEntryName);
                ml_printf("Device Type: %s", rasbuffer[i].szDeviceType);
                ml_printf("Device Name: %s", rasbuffer[i].szDeviceName);

                // get the connection status
                status.dwSize = sizeof(RASCONNSTATUS);
                rval = pRasGetConnectStatus(rasbuffer[i].hrasconn, &status);
                if ( rval != 0 ) {
                        FreeLibrary( ras_handle );
                        return INADDR_ANY;
                }

                // get the projection informatiom
                size = sizeof(projection);
                projection.dwSize = size;
                rval = pRasGetProjectionInfo(rasbuffer[i].hrasconn, RASP_PppIp, &projection, &dummySize );
                if ( rval != 0 ) {
                        FreeLibrary( ras_handle );
                        return INADDR_ANY;
                }

                ml_printf("IP Address: %s", projection.szIpAddress);
        }

        if (!valid_connections) {
                FreeLibrary( ras_handle );
                return INADDR_ANY;
        }

        Ras_connected = 1;

        FreeLibrary( ras_handle );
        rasip = inet_addr(projection.szIpAddress);
        if(rasip==INADDR_NONE){
                return INADDR_ANY;
        }

        //The ip of the RAS connection
        return rasip;
}
#endif // Dial-Up Networking

void psnet_socket_options( SOCKET sock )
{
        int broadcast;
        int cursize, bufsize; 
        socklen_t cursizesize;

        // Set the mode of the socket to allow broadcasting. 
        // Broadcasting was needed when searching for a game in IPX mode.
        // Unclear if still needed.
        broadcast = 1;
        if(setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (LPSTR)&broadcast, sizeof(broadcast) )){
                Can_broadcast = 0;
        } else {
                Can_broadcast = 1;
        }

        // try and increase the size of my receive buffer
        bufsize = MAX_RECEIVE_BUFSIZE;
        
        // set the current size of the receive buffer
        cursizesize = sizeof(int);
        getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&cursize, &cursizesize);
        setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&bufsize, sizeof(bufsize));
        getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&cursize, &cursizesize);
        ml_printf("Receive buffer set to %d", cursize);

        // set the current size of the send buffer
        cursizesize = sizeof(int);
        getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&cursize, &cursizesize);
        setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&bufsize, sizeof(bufsize));
        getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&cursize, &cursizesize);
        ml_printf("Send buffer set to %d", cursize);
}

int psnet_init_tcp()
{       
        SOCKADDR_IN sockaddr;

        TCP_socket = INVALID_SOCKET;    
        
        TCP_socket = socket( AF_INET, SOCK_DGRAM, 0 );
        if ( TCP_socket == (int)INVALID_SOCKET ) {
                Tcp_failure_code = WSAGetLastError();
                ml_printf("Error on TCP startup %d", Tcp_failure_code);
                return 0;
        }

        // bind the socket
        memset(&sockaddr,0,sizeof(SOCKADDR_IN));
        sockaddr.sin_family = AF_INET; 
        sockaddr.sin_addr.s_addr = psnet_get_ip();
        sockaddr.sin_port = htons( Psnet_default_port );
        if ( bind(TCP_socket, (SOCKADDR*)&sockaddr, sizeof (sockaddr)) == SOCKET_ERROR) {       
                Tcp_failure_code = WSAGetLastError();

                if (Tcp_failure_code == WSAEADDRINUSE) {
                        ml_printf("TCP socket already in use!  Another instance running?  (Try using the \"-port %i\" cmdline option)", Psnet_default_port + 1);
                } else {
                        ml_printf("Couldn't bind TCP socket (%d)! Invalidating TCP", Tcp_failure_code );
                }

                return 0;
        }

        // set socket options
        psnet_socket_options( TCP_socket );             
        Tcp_can_broadcast = Can_broadcast;

        // success
        return 1;
}

float psnet_get_time()
{               
        return (float)timer_get_milliseconds() / 1000.0f;
}

void psnet_mark_received(PSNET_SOCKET_RELIABLE socket)
{
        // valid socket?
        if((socket == 0xffffffff) || (socket >= MAXRELIABLESOCKETS)){
                return;
        }

        // mark it
        Reliable_sockets[socket].last_packet_received = psnet_get_time();
}