raze-gles/polymer/eduke32/build/src/mmulti_unstable.c

/*
 * "Build Engine & Tools" Copyright (c) 1993-1997 Ken Silverman
 * Ken Silverman's official web site: "http://www.advsys.net/ken"
 * See the included license file "BUILDLIC.TXT" for license info.
 * This file has been modified from Ken Silverman's original release
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <time.h>
#include <sys/time.h> //HACK, for id generation

#include "mmulti_unstable.h"
// #include <enet/enet.h>
#include "compat.h"
#include "baselayer.h"


//STL
//#include <vector>
//#include "buildqueue.h"

// #include "platform.h"

#ifdef _WIN32
#define PLATFORM_WIN32 1
#else
#define PLATFORM_UNIX 1
#endif

#define UDP_NETWORKING 1

#include "pragmas.h"

#define MAXPLAYERS 16
#define BAKSIZ 16384
#define SIMULATEERRORS 0
#define SHOWSENDPACKETS 0
#define SHOWGETPACKETS 0
#define PRINTERRORS 0

#define updatecrc16(crc,dat) crc = (((crc<<8)&65535)^crctable[((((unsigned short)crc)>>8)&65535)^dat])

static int incnt[MAXPLAYERS], outcntplc[MAXPLAYERS], outcntend[MAXPLAYERS];
static char errorgotnum[MAXPLAYERS];
static char errorfixnum[MAXPLAYERS];
static char errorresendnum[MAXPLAYERS];
#if (PRINTERRORS)
static char lasterrorgotnum[MAXPLAYERS];
#endif

int crctable[256];
int tmpmax[8]; //addfaz variable addition (you could probs think of something better)
int itmp = 0; //addfaz router fix STUN

static char lastpacket[576], inlastpacket = 0;
static int lastpacketfrom, lastpacketleng;

extern int totalclock;  /* MUST EXTERN 1 ANNOYING VARIABLE FROM GAME */
static int timeoutcount = 60, resendagaincount = 4, lastsendtime[MAXPLAYERS];

int natfree; //NatFree mode flag

static short bakpacketptr[MAXPLAYERS][256], bakpacketlen[MAXPLAYERS][256];
static char bakpacketbuf[BAKSIZ];
static int bakpacketplc = 0;

int myconnectindex, numplayers;
int connecthead, connectpoint2[MAXPLAYERS];
char syncstate = 0;

#define MAXPACKETSIZE 2048
typedef struct
{
    short intnum;                /* communication between Game and the driver */
    short command;               /* 1-send, 2-get */
    short other;                 /* dest for send, set by get (-1 = no packet) */
    short numbytes;
    short myconnectindex;
    short numplayers;
    short gametype;              /* gametype: 1-serial,2-modem,3-net */
    short filler;
    char buffer[MAXPACKETSIZE];
    intptr_t longcalladdress;
} gcomtype;
static gcomtype *gcom;

/*
//
// Packet queue data structs
//
typedef struct packet_wrapper
{
	unsigned long packetnumber;
	gcomtype packet;
} PACKETWRAPPER;

typedef PACKETWRAPPER packet_buffer;

unsigned long currentpacketnumber[MAXPLAYERS];

//
// Packet Buffer
//
packet_buffer pBuff[256];
*/


/*
typedef struct
{
	unsigned char buffer[MAXPACKETSIZE];
}PACKET;
*/

//typedef std::vector<PACKET> PacketQueue;

enum ECommitCMDs
{
    COMMIT_CMD_SEND				= 1,
    COMMIT_CMD_GET              = 2,
    COMMIT_CMD_SENDTOALL        = 3,
    COMMIT_CMD_SENDTOALLOTHERS  = 4,
    COMMIT_CMD_SCORE            = 5,
};


// Queue of out going packets.
//PacketQueue outgoingPacketQueue;
//outgoingPacketQueue.reserve(128);

gcomtype *init_network_transport(char **ARGV, int argpos);
void deinit_network_transport(gcomtype *gcom);
//void callcommit(void);
void dosendpackets(int other);


void initcrc(void)
{
    int i, j, k, a;

    for (j=0;j<256;j++)     /* Calculate CRC table */
    {
        k = (j<<8); a = 0;
        for (i=7;i>=0;i--)
        {
            if (((k^a)&0x8000) > 0)
                a = ((a<<1)&65535) ^ 0x1021;   /* 0x1021 = genpoly */
            else
                a = ((a<<1)&65535);
            k = ((k<<1)&65535);
        }
        crctable[j] = (a&65535);
    }
}


int getcrc(char *buffer, int bufleng)
{
    int i, j;

    j = 0;
    for (i=bufleng-1;i>=0;i--) updatecrc16(j,buffer[i]);
    return(j&65535);
}

void initmultiplayers(int argc, char **argv)
{
    int i;

    UNREFERENCED_PARAMETER(argc);

    initcrc();
    for (i=0;i<MAXPLAYERS;i++)
    {
        incnt[i] = 0L;
        outcntplc[i] = 0L;
        outcntend[i] = 0L;
        bakpacketlen[i][255] = -1;
    }

    // clear out the packet ordering
//	memset(&currentpacketnumber, 0, sizeof(unsigned long) * MAXPLAYERS);
#if 0
    for (i = argc - 1; i > 0; i--)
    {
        const char *arg = argv[i];
        char ch = *arg;
        if ((ch == '-') || (ch == '/'))
        {
            if (Bstrcasecmp(arg + 1, "net") == 0)
                break;
        }
    }
#endif

    if (!argc)
    {
        initprintf("mmulti_unstable: No configuration file specified!\n");
        numplayers = 1; myconnectindex = 0;
        connecthead = 0; connectpoint2[0] = -1;
        return;
    }

    gcom = init_network_transport(argv, 0);
    if (gcom == NULL)
    {
        initprintf("Network transport initialization failed. Aborting...\n");
        exit(1);
    }

    numplayers = gcom->numplayers;
    myconnectindex = gcom->myconnectindex-1;
#if (SIMULATEERRORS != 0)
    srand(myconnectindex*24572457+345356);
#endif
    connecthead = 0;
    for (i=0;i<numplayers-1;i++) connectpoint2[i] = i+1;
    connectpoint2[numplayers-1] = -1;

    for (i=0;i<numplayers;i++) lastsendtime[i] = totalclock;
}


void dosendpackets(int other)
{
    int i, j, k, messleng;
    unsigned short dacrc;

    if (outcntplc[other] == outcntend[other]) return;

#if (PRINTERRORS)
    if (errorgotnum[other] > lasterrorgotnum[other])
    {
        lasterrorgotnum[other]++;
        initprintf(" MeWant %ld",incnt[other]&255);
    }
#endif

    if (outcntplc[other]+1 == outcntend[other])
    {     /* Send 1 sub-packet */
        k = 0;
        gcom->buffer[k++] = (outcntplc[other]&255);
        gcom->buffer[k++] = (errorgotnum[other]&7)+((errorresendnum[other]&7)<<3);
        gcom->buffer[k++] = (incnt[other]&255);

        j = bakpacketptr[other][outcntplc[other]&255];
        messleng = bakpacketlen[other][outcntplc[other]&255];
        for (i=0;i<messleng;i++)
            gcom->buffer[k++] = bakpacketbuf[(i+j)&(BAKSIZ-1)];
        outcntplc[other]++;
    }
    else
    {     /* Send 2 sub-packets */
        k = 0;
        gcom->buffer[k++] = (outcntplc[other]&255);
        gcom->buffer[k++] = (errorgotnum[other]&7)+((errorresendnum[other]&7)<<3)+128;
        gcom->buffer[k++] = (incnt[other]&255);

        /* First half-packet */
        j = bakpacketptr[other][outcntplc[other]&255];
        messleng = bakpacketlen[other][outcntplc[other]&255];
        gcom->buffer[k++] = (char)(messleng&255);
        gcom->buffer[k++] = (char)(messleng>>8);
        for (i=0;i<messleng;i++)
            gcom->buffer[k++] = bakpacketbuf[(i+j)&(BAKSIZ-1)];
        outcntplc[other]++;

        /* Second half-packet */
        j = bakpacketptr[other][outcntplc[other]&255];
        messleng = bakpacketlen[other][outcntplc[other]&255];
        for (i=0;i<messleng;i++)
            gcom->buffer[k++] = bakpacketbuf[(i+j)&(BAKSIZ-1)];
        outcntplc[other]++;

    }

    dacrc = getcrc(gcom->buffer,(short)k);
    gcom->buffer[k++] = (dacrc&255);
    gcom->buffer[k++] = (dacrc>>8);

    gcom->other = other+1;
    gcom->numbytes = k;

#if (SHOWSENDPACKETS)
    initprintf("Send(%ld): ",gcom->other);
    for (i=0;i<gcom->numbytes;i++) initprintf("%2x ",gcom->buffer[i]);
    initprintf("\n");
#endif

#if (SIMULATEERRORS != 0)
    if (!(rand()&SIMULATEERRORS)) gcom->buffer[rand()%gcom->numbytes] = (rand()&255);
    if (rand()&SIMULATEERRORS)
#endif
    {
        gcom->command = COMMIT_CMD_SEND;
        callcommit();
    }
}


void sendpacket(int other, char *bufptr, int messleng)
{
    int i = 0;
    int j = 0;

    if (numplayers < 2) return;

    i = 0;
    if (bakpacketlen[other][(outcntend[other]-1)&255] == messleng)
    {
        j = bakpacketptr[other][(outcntend[other]-1)&255];
        for (i=messleng-1;i>=0;i--)
            if (bakpacketbuf[(i+j)&(BAKSIZ-1)] != bufptr[i]) break;
    }
    bakpacketlen[other][outcntend[other]&255] = messleng;

    if (i < 0)   /* Point to last packet to save space on bakpacketbuf */
        bakpacketptr[other][outcntend[other]&255] = j;
    else
    {
        bakpacketptr[other][outcntend[other]&255] = bakpacketplc;
        for (i=0;i<messleng;i++)
            bakpacketbuf[(bakpacketplc+i)&(BAKSIZ-1)] = bufptr[i];
        bakpacketplc = ((bakpacketplc+messleng)&(BAKSIZ-1));
    }
    outcntend[other]++;

    lastsendtime[other] = totalclock;
    dosendpackets(other);
}


void setpackettimeout(int datimeoutcount, int daresendagaincount)
{
    UNREFERENCED_PARAMETER(datimeoutcount);
    UNREFERENCED_PARAMETER(daresendagaincount);
    // Don't do this it keeps '/f4' from working
    // Though /f4 feels weird on my mouse.... slugish is the word...
    /*
    int i;

    timeoutcount = datimeoutcount;
    resendagaincount = daresendagaincount;
    for(i=0;i<numplayers;i++) lastsendtime[i] = totalclock;
    */
}


void uninitmultiplayers(void)
{
    deinit_network_transport(gcom);
    gcom = NULL;
}

typedef enum
{
    udpmode_peer,
    udpmode_server,
    udpmode_client
} udpmodes;
static udpmodes udpmode = udpmode_peer;

void sendlogon(void)
{
}

void sendlogoff(void)
{
    int i;
    char tempbuf[2];

    tempbuf[0] = 255;
    tempbuf[1] = myconnectindex;
    for (i=connecthead;i>=0;i=connectpoint2[i])
    {
        if (i != myconnectindex)
            sendpacket(i,tempbuf,2L);
        if ((udpmode == udpmode_client) && (myconnectindex != connecthead)) break; //slaves in M/S mode only send to master
    }
}

int getoutputcirclesize(void)
{
    return(0);
}

void setsocket(int newsocket)
{
    UNREFERENCED_PARAMETER(newsocket);
}


int getpacket(int *other, char *bufptr)
{
    int i, messleng;
    unsigned short dacrc;

    if (numplayers < 2 || gcom == NULL) return(0);

    for (i=connecthead;i>=0;i=connectpoint2[i])
    {
        if (i != myconnectindex)
        {
            // FIXME: this is probably not so great
            if (udpmode != udpmode_peer) dosendpackets(i);
            if (totalclock < lastsendtime[i]) lastsendtime[i] = totalclock;
            if (totalclock > lastsendtime[i]+timeoutcount)
            {
#if (PRINTERRORS)
                initprintf(" TimeOut!");
#endif
                errorgotnum[i] = errorfixnum[i]+1;

                if ((outcntplc[i] == outcntend[i]) && (outcntplc[i] > 0))
                    { outcntplc[i]--; lastsendtime[i] = totalclock; }
                else
                    lastsendtime[i] += resendagaincount;
                dosendpackets(i);
                /* } */
            }
        }
        if ((udpmode == udpmode_client) && (myconnectindex != connecthead)) break; //slaves in M/S mode only send to master
    }

    if (inlastpacket != 0)
    {
        /* 2ND half of good double-packet */
        inlastpacket = 0;
        *other = lastpacketfrom;
        memcpy(bufptr,lastpacket,lastpacketleng);
        return(lastpacketleng);
    }

    gcom->command = COMMIT_CMD_GET;
    callcommit();

#if (SHOWGETPACKETS)
    if (gcom->other != -1)
    {
        initprintf(" Get(%ld): ",gcom->other);
        for (i=0;i<gcom->numbytes;i++) initprintf("%2x ",gcom->buffer[i]);
        initprintf("\n");
    }
#endif

    if (gcom->other < 0) return(0);
    *other = gcom->other-1;

    messleng = gcom->numbytes;

    dacrc = ((unsigned short)gcom->buffer[messleng-2]);
    dacrc += (((unsigned short)gcom->buffer[messleng-1])<<8);
    if (dacrc != getcrc(gcom->buffer,(short)(messleng-2)))        /* CRC check */
    {
#if (PRINTERRORS)
        initprintf("\n%ld CRC",gcom->buffer[0]);
#endif
        errorgotnum[*other] = errorfixnum[*other]+1;
        return(0);
    }

    while ((errorfixnum[*other]&7) != ((gcom->buffer[1]>>3)&7))
        errorfixnum[*other]++;

    if ((gcom->buffer[1]&7) != (errorresendnum[*other]&7))
    {
        errorresendnum[*other]++;
        outcntplc[*other] = (outcntend[*other]&0xffffff00)+gcom->buffer[2];
        if (outcntplc[*other] > outcntend[*other]) outcntplc[*other] -= 256;
    }

    if (gcom->buffer[0] != (incnt[*other]&255))   /* CNT check */
    {
        if (((incnt[*other]-gcom->buffer[0])&255) > 32)
        {
            errorgotnum[*other] = errorfixnum[*other]+1;
#if (PRINTERRORS)
            initprintf("\n%ld CNT",gcom->buffer[0]);
#endif
        }
#if (PRINTERRORS)
        else
        {
            if (!(gcom->buffer[1]&128))           /* single else double packet */
                initprintf("\n%ld cnt",gcom->buffer[0]);
            else
            {
                if (((gcom->buffer[0]+1)&255) == (incnt[*other]&255))
                {
                    /* GOOD! Take second half of double packet */
#if (PRINTERRORS)
                    initprintf("\n%ld-%ld .<2E> ",gcom->buffer[0],(gcom->buffer[0]+1)&255);
#endif
                    messleng = ((int)gcom->buffer[3]) + (((int)gcom->buffer[4])<<8);
                    lastpacketleng = gcom->numbytes-7-messleng;
                    memcpy(bufptr,&gcom->buffer[messleng+5],lastpacketleng);
                    incnt[*other]++;
                    return(lastpacketleng);
                }
                else
                    initprintf("\n%ld-%ld cnt ",gcom->buffer[0],(gcom->buffer[0]+1)&255);
            }
        }
#endif
        return(0);
    }

    /* PACKET WAS GOOD! */
    if ((gcom->buffer[1]&128) == 0)           /* Single packet */
    {
#if (PRINTERRORS)
        initprintf("\n%ld <20>  ",gcom->buffer[0]);
#endif

        messleng = gcom->numbytes-5;

        memcpy(bufptr,&gcom->buffer[3],messleng);

        incnt[*other]++;
        return(messleng);
    }

    /* Double packet */
#if (PRINTERRORS)
    initprintf("\n%ld-%ld <20><> ",gcom->buffer[0],(gcom->buffer[0]+1)&255);
#endif

    messleng = ((int)gcom->buffer[3]) + (((int)gcom->buffer[4])<<8);
    lastpacketleng = gcom->numbytes-7-messleng;
    inlastpacket = 1; lastpacketfrom = *other;

    memcpy(bufptr,&gcom->buffer[5],messleng);
    memcpy(lastpacket,&gcom->buffer[messleng+5],lastpacketleng);

    incnt[*other] += 2;
    return(messleng);
}

void flushpackets()
{
#if 0
    int i;

    if (numplayers < 2) return;

    do
    {
        gcom->command = COMMIT_CMD_GET;
        callcommit();
    }
    while (gcom->other >= 0);

    for (i=connecthead;i>=0;i=connectpoint2[i])
    {
        incnt[i] = 0L;
        outcntplc[i] = 0L;
        outcntend[i] = 0L;
        errorgotnum[i] = 0;
        errorfixnum[i] = 0;
        errorresendnum[i] = 0;
        lastsendtime[i] = totalclock;
    }
#endif
}

void genericmultifunction(int other, char *bufptr, int messleng, int command)
{
    if (numplayers < 2) return;

    gcom->command = command;
    gcom->numbytes = min(messleng,MAXPACKETSIZE);
    copybuf(bufptr,gcom->buffer,(gcom->numbytes+3)>>2);
    gcom->other = other+1;
    callcommit();

}

#if UDP_NETWORKING

#if PLATFORM_WIN32
#  include <winsock.h>
#  define EWOULDBLOCK WSAEWOULDBLOCK
#  define ECONNREFUSED WSAECONNRESET
#  define socklen_t size_t
#  define netstrerror() win32netstrerror()
#  define neterrno() WSAGetLastError()
#  define sockettype SOCKET
#  define socketclose(x) closesocket(x)
#else
#  include <sys/types.h>
#  include <sys/socket.h>
#  include <netinet/in.h>
#  include <arpa/inet.h>
#  include <netdb.h>
#  include <sys/uio.h>
#  include <sys/ioctl.h>
#  include <sys/time.h>
#  include <errno.h>
#  include <fcntl.h>
#  include <time.h>
#  define netstrerror() strerror(errno)
#  define neterrno() errno
#  define sockettype int
#  define socketclose(x) close(x)
#  ifndef MSG_ERRQUEUE  /* legacy glibc header workaround... */
#    define MSG_ERRQUEUE 0x2000
#  endif
#endif

#define SOCKET_SHUTDOWN_BOTH 2

#include "cache1d.h"  /* kopen4load for cfg file. */

#define IPSEG1(ip) ((((unsigned int) ip) & 0xFF000000) >> 24)
#define IPSEG2(ip) ((((unsigned int) ip) & 0x00FF0000) >> 16)
#define IPSEG3(ip) ((((unsigned int) ip) & 0x0000FF00) >>  8)
#define IPSEG4(ip) ((((unsigned int) ip) & 0x000000FF)      )

#define MAX_PLAYERS 16
#define BUILD_DEFAULT_UDP_PORT 23513  /* eh...why not? */
#define CLIENT_POLL_DELAY 5000  /* ms between pings at peer-to-peer startup. */
#define HEADER_PEER_GREETING 245

static sockettype udpsocket = -1;
static short udpport = BUILD_DEFAULT_UDP_PORT;

static struct
{
    int host;
    short port;
} allowed_addresses[MAX_PLAYERS];  /* only respond to these IPs. */

#if PLATFORM_WIN32
/*
 * Figure out what the last failing Win32 API call was, and
 *  generate a human-readable string for the error message.
 *
 * The return value is a static buffer that is overwritten with
 *  each call to this function.
 *
 * Code lifted from PhysicsFS: http://icculus.org/physfs/
 */
static const char *win32netstrerror(void)
{
    static TCHAR msgbuf[255];
    TCHAR *ptr = msgbuf;

    FormatMessage(
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        WSAGetLastError(), /*GetLastError(),*/
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */
        msgbuf,
        sizeof(msgbuf) / sizeof(TCHAR),
        NULL
    );

    /* chop off newlines. */
    for (ptr = msgbuf; *ptr; ptr++)
    {
        if ((*ptr == '\n') || (*ptr == '\r'))
        {
            *ptr = ' ';
            break;
        } /* if */
    } /* for */

    return((const char *) msgbuf);
} /* win32strerror */
#endif

static char *static_ipstring(int ip)
{
    static char s[16];
    sprintf(s, "%u.%u.%u.%u", IPSEG1(ip), IPSEG2(ip), IPSEG3(ip), IPSEG4(ip));
    return(s);
}


static int send_udp_packet(int ip, short port, void *pkt, size_t pktsize)
{
    /* !!! FIXME: See if this would ever block. */
    /* !!! FIXME: See if this would send a partial packet. */
    struct sockaddr_in addr;
    int rc;

    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(ip);
    addr.sin_port = htons(port);

    rc = sendto(udpsocket, pkt, pktsize, 0,
                (struct sockaddr *) &addr, sizeof(addr));

    if (rc != (int) pktsize)
    {
        initprintf("sendto err rc==%d when sending %d to %s:%d [%s].\n",
                   rc, (int) pktsize, static_ipstring(ip), (int) port,
                   netstrerror());
        return(0);
    }

    /*initprintf("Sent %d byte packet to %s:%d\n", (int) pktsize, static_ipstring(ip), (int) port);*/

    return(1);
}


static void process_udp_send_queue(void)
{
    /* Fill this in if the non-blocking socket becomes an issue. */
}


static int get_udp_packet(int *ip, short *_port, void *pkt, size_t pktsize)
{
    int err = 0;
    struct sockaddr_in addr;
    short port;
    socklen_t fromlen = sizeof(addr);
    int valid = 0;
    int i;

    /* FIXME: Will this ever receive a partial packet? */
    int rc = recvfrom(udpsocket, pkt, pktsize, 0, (struct sockaddr *) &addr,
#ifdef _WIN32
                      (int *)&fromlen);
#else
                      (unsigned int *)&fromlen);
#endif

    if (rc == -1)
        err = neterrno();

#if !PLATFORM_WIN32
    /* !!! FIXME: Linux specific? */
    if (rc == -1)  /* fill in the addr structure on error... */
    {
        socklen_t l = sizeof(addr);
        recvfrom(udpsocket, NULL, 0, MSG_ERRQUEUE,
                 (struct sockaddr *) &addr, &l);
    }
#endif

    *ip = ntohl(addr.sin_addr.s_addr);
    port = ntohs(addr.sin_port);
    if (_port)
        *_port = port;

    /*
     * Reject packets from unallowed IPs. Prevents (ha) DoS attacks and
     *  other confusion...
     */
    if (gcom == NULL)
    {
        if (natfree) //if stun is enabled
        {
            if ((allowed_addresses[itmp].host == *ip)
                    && (allowed_addresses[itmp].port == port))
            {
                valid = 1; //only accept packets from the current player (itmp) and no one else
            }
            else
            {
                return 0; //reject packets from other players
            }
        }
        else
        {
            valid = 1;
        }
    }
    else
    {
        for (i = 1; i <= gcom->numplayers; i++)
        {
            if ((allowed_addresses[i].host == *ip)
                    && (allowed_addresses[i].port == port))

            {
                valid = i;

                //initprintf ("Packet received from %s:%d\n",static_ipstring(*ip), (int) port);

                break;
            }

        }
    }

    /*if (!valid)
    {

        static int unallowed_ip_spam = 0;
        if (unallowed_ip_spam <= 100)
        {
            initprintf("Packet received from unallowed IP %s:%d\n",
                    static_ipstring(*ip), (int) port);
            if (unallowed_ip_spam == 100)
                initprintf("(Disabling further unallowed IP spam.)\n");
            unallowed_ip_spam++;
        }

        return(0);
    } */

    if (rc == -1)
    {
        if ((err == EAGAIN) || (err == EWOULDBLOCK))
            rc = 0;

        else if (err == ECONNREFUSED)   //"connection reset by peer" in winsock
        {

            //  This means that we sent a packet to an unopened port, and
            //  it responded by telling us to piss off. Take them out of the
            //  allowed list. We check gcom so that we don't worry about this
            //  during detection when game might still be loading elsewhere.

            if (gcom != NULL)
            {
                allowed_addresses[valid].host = 0;
                initprintf("%s:%d refused packets. Removed from game.\n",
                           static_ipstring(*ip), (int) port);
            }
            // !!! FIXME: Actually boot player, too.
        }

        else
        {
            initprintf("recvfrom err rc==%d when getting %d from %s:%d [%s].\n",
                       rc, (int) pktsize, static_ipstring(*ip), (int) port,
                       netstrerror());
        }
    }
//else initprintf("Got %d byte packet from %s:%d\n", (int) rc, static_ipstring(*ip), (int) port);
    //initprintf( "IP from client %d", *ip);
    return(rc);
}


static char *read_whole_file(const char *cfgfile)
{
    char *buf;
    int len, rc;
    int handle;

    if (cfgfile == NULL)
        return(NULL);

    handle = kopen4load((char *)cfgfile, 0);
    if (handle == -1)
    {
        initprintf("ERROR: Failed to open config file [%s].\n", cfgfile);
        return(NULL);
    }

    len = kfilelength(handle);
    buf = (char *) malloc(len + 2);
    if (!buf)
    {
        kclose(handle);
        return(NULL);
    }

    rc = kread(handle, buf, len);
    kclose(handle);
    if (rc != len)
    {
        free(buf);
        return(NULL);
    }

    buf[len] = '\0';
    buf[len+1] = '\0';
    return(buf);
}

static char *get_token(char **ptr)
{
    char *retval;
    char *p = *ptr;
    if (*p == '\0')
        return(NULL);

    while ((*p != '\0') && (isspace(*p)))
        p++;

    if (*p == '\0')  /* nothing but whitespace. */
        return(NULL);

    retval = p;
    while ((*p != '\0') && (!isspace(*p)))
        p++;

    *p = '\0';
    *ptr = p + 1;

    /*initprintf("Got token [%s].\n", retval);*/
    return(retval);
}

static int set_socket_blockmode(int onOrOff)
{
    unsigned int flags;
    int rc = 0;

    /* set socket to be (non-)blocking. */

#if PLATFORM_WIN32
    flags = (onOrOff) ? 0 : 1;
    rc = (ioctlsocket(udpsocket, FIONBIO, (void *) &flags) == 0);
#else
    flags = fcntl(udpsocket, F_GETFL, 0);
    if ((signed)flags != -1)
    {
        if (onOrOff)
            flags &= ~O_NONBLOCK;
        else
            flags |= O_NONBLOCK;
        rc = (fcntl(udpsocket, F_SETFL, flags) == 0);
    }
#endif

    if (!rc)
    {
        initprintf("set socket %sblocking failed: %s\n",
                   ((onOrOff) ? "" : "non-"), netstrerror());
    }

    return(rc);
}


static int set_socket_broadcast(int onOrOff)
{
    int f = (onOrOff) ? 1 : 0;
    int rc;

    /* give socket clearance to broadcast. */
    rc = setsockopt(udpsocket, SOL_SOCKET, SO_BROADCAST, (char *)(&f), sizeof(f)) == 0;
    if (!rc)
    {
        initprintf("%sset SO_BROADCAST failed: %s\n",
                   ((onOrOff) ? "" : "un"), netstrerror());
    }

    return(rc);
}


static int open_udp_socket(int ip, int port)
{
    struct sockaddr_in addr;

//    initprintf("Setting up UDP interface %s:%d...\n", static_ipstring(ip), port);
    if (natfree)
    {
        //initprintf("Stun is currently %s\n", (natfree) ? "Enabled":"Disabled");
        initprintf("mmulti_unstable: Stun enabled\n");
    }

    udpsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if ((signed)udpsocket == -1)
    {
        initprintf("socket creation failed: %s\n", netstrerror());
        return(0);
    }

    if (!set_socket_blockmode(0))
        return(0);

#if !PLATFORM_WIN32
    {
        /* !!! FIXME: Might be Linux (not Unix, not BSD, not WinSock) specific. */
        int flags = 1;
        setsockopt(udpsocket, SOL_IP, IP_RECVERR, &flags, sizeof(flags));
    }
#endif

    memset(&addr, '\0', sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(ip);
    addr.sin_port = htons((unsigned short)port);
    if (bind(udpsocket, (struct sockaddr *) &addr, sizeof(addr)) == -1)
    {
        initprintf("socket binding failed: %s\n", netstrerror());
        return(0);
    }

    return(1);
}

typedef struct
{
    unsigned char dummy1;   /* so these don't confuse game after load. */
    unsigned char dummy2;   /* so these don't confuse game after load. */
    unsigned char dummy3;   /* so these don't confuse game after load. */
    unsigned char header;   /* always HEADER_PEER_GREETING (245). */
    unsigned short id;
} PacketPeerGreeting;


static void send_peer_greeting(int ip, short port, short myid)
{
    PacketPeerGreeting packet;
    memset(&packet, '\0', sizeof(packet));
    packet.header = HEADER_PEER_GREETING;
    packet.id = B_SWAP16(myid);
    send_udp_packet(ip, port, &packet, sizeof(packet));
}

/* server init. */
static int wait_for_other_players(gcomtype *gcom, int myip)
{
    PacketPeerGreeting packet;
    unsigned short my_id = 1;
    int i, j;
    int rc;
    int ip;
    short port;
    unsigned short heard_from[MAX_PLAYERS];
    int max;
    int remaining;

    memset(heard_from, '\0', sizeof(heard_from));

    remaining = max = gcom->numplayers - 1;

    initprintf("Waiting for %d player%s...\n", remaining, remaining==1 ? "":"s");
    if (remaining == 0)
    {
        initprintf("Hmmm... don't have time to play with myself!\n");
        return(0);
    }

    while (remaining && !quitevent)
    {
        handleevents();

        idle();

        process_udp_send_queue();

        rc = get_udp_packet(&ip, &port, &packet, sizeof(packet));

        //this is so we don't get unexpected packet errors from players already heard from

        if ((rc > 0) && (ip) && ((ip != myip) || (port != udpport)))
        {
            char *ipstr = static_ipstring(ip);

            if (rc != sizeof(packet))
            {
                initprintf("mmulti_unstable: Missized packet or fragment from %s:%i ?!\n", ipstr, port);
                continue;
            }
            else if (packet.header != HEADER_PEER_GREETING)
            {
                initprintf("mmulti_unstable: Unexpected packet type from %s:%i ?!\n", ipstr, port);
                continue;
            }

            for (i = 0; i < max; i++)
            {
                if (!heard_from[i] || heard_from[i] == B_SWAP16(packet.id))
                    break;
            }

            if (i == max)
                initprintf("mmulti_unstable: Disallowed player %s:%d ?!\n", ipstr, port);
            else if (heard_from[i] == 0)
            {
                packet.id = B_SWAP16(packet.id);
                heard_from[i] = packet.id;
                allowed_addresses[i].host = ip;   /* bcast needs this. */
                allowed_addresses[i].port = port;
                remaining--;

                initprintf("%s:%i (id 0x%X) connected, %d player%s left.\n",
                           ipstr, port ,(int) packet.id,
                           remaining, remaining == 1 ? "" : "s");

                /* make sure they've heard from us at all... */
                /* !!! FIXME: Could be fatal if packet is dropped... */

                send_peer_greeting(allowed_addresses[i].host,
                                   allowed_addresses[i].port,
                                   my_id);

                // resend greeting to other clients so they get ID for sorting
                /*                for (j=i;j>=0;j--)
                                {
                                    int ii;
                                    for (ii = 1; ii < max; ii++)
                                        send_peer_greeting(allowed_addresses[j].host,
                                        allowed_addresses[j].port,
                                        heard_from[ii]);

                                    send_peer_greeting(allowed_addresses[j].host,
                                        allowed_addresses[j].port,
                                        heard_from[i]);
                                }*/
            }
        }
    }

    if (quitevent)
    {
        initprintf("Connection attempt aborted.\n");
        return(0);
    }

    // found all the clients expected so send them our greeting
    for (j=max;j>=0;j--)
        if (allowed_addresses[j].host)
        {
            int ii;
            for (ii = 0; ii < max; ii++)
                send_peer_greeting(allowed_addresses[j].host,
                                   allowed_addresses[j].port,
                                   heard_from[ii]);

            send_peer_greeting(allowed_addresses[j].host,
                               allowed_addresses[j].port,
                               1337);
        }

    /* ok, now everyone is talking to you. Sort them into player numbers... */

    heard_from[max] = my_id; /* so we sort, too... */
    allowed_addresses[max].host = myip;
    allowed_addresses[max].port = udpport;

    do
    {
        remaining = 0;
        for (i = 0; i < max; i++)
        {
            if (heard_from[i] == heard_from[i+1])  /* blah. */
            {
                initprintf("mmulti_unstable: ERROR: Two players have the same random ID!\n");
                initprintf("mmulti_unstable: ERROR: Please restart the game to generate new IDs.\n");
                return(0);
            }

            else if (heard_from[i] > heard_from[i+1])
            {
                int tmpi;
                short tmps;

                tmps = heard_from[i];
                heard_from[i] = heard_from[i+1];
                heard_from[i+1] = tmps;

                tmpi = allowed_addresses[i].host;
                allowed_addresses[i].host = allowed_addresses[i+1].host;
                allowed_addresses[i+1].host = tmpi;

                tmps = allowed_addresses[i].port;
                allowed_addresses[i].port = allowed_addresses[i+1].port;
                allowed_addresses[i+1].port = tmps;

                remaining = 1;  /* yay for bubble sorting! */
            }
        }
    }
    while (remaining);

    /*
     * Now we're sorted. But, the local player is referred to by both his
     *  player number and player index ZERO, so bump everyone up one to
     *  their actual index and fill in local player as item zero.
     */

    memmove(&allowed_addresses[1], &allowed_addresses[0],
            sizeof(allowed_addresses) - sizeof(allowed_addresses[0]));
    allowed_addresses[0].host = myip;

    gcom->myconnectindex = 0;
    for (i = 1; i <= gcom->numplayers; i++)
    {
        ip = (allowed_addresses[i].host);


        if (ip == myip)
        {
            if (udpport == allowed_addresses[i].port)
                gcom->myconnectindex = i;
        }

        initprintf("mmulti_unstable: player #%i at %s:%i\n", i,static_ipstring(ip),allowed_addresses[i].port);
    }
//    assert(gcom->myconnectindex);

    initprintf("mmulti_unstable: We are player #%i\n", gcom->myconnectindex);

    return(1);
}

/* client init. */
static int connect_to_server(gcomtype *gcom, int myip)
{
    PacketPeerGreeting packet;
    unsigned short my_id = 0;
    int i;
    int rc;
    int ip;
    short port;
    int first_send = 1;
    unsigned short heard_from[MAX_PLAYERS];
    unsigned int resendat;
    int max;
    int remaining;

    memset(heard_from, '\0', sizeof(heard_from));

    gcom->numplayers = 2;

    while (my_id == 0)  /* player number is based on id, low to high. */
    {
        struct timeval tv;
        gettimeofday(&tv, NULL);
        my_id = (unsigned short)tv.tv_usec; //HACK
    }

    initprintf("mmulti_unstable: Using 0x%X as client ID\n", my_id);

    resendat = getticks();
    remaining = max = gcom->numplayers - 1;

    initprintf("Waiting for %d player%s...\n", remaining, remaining==1 ? "":"s");
    if (remaining == 0)
    {
        initprintf("Hmmm... don't have time to play with myself!\n");
        return(0);
    }

    while (remaining && !quitevent)
    {
        handleevents();

        if (resendat <= getticks())
        {
            for (i = 0; (i < max) || natfree ; i++)
            {

                //only checking one player at a time works
                //this is where special formatting of allow lines comes in
                if (!heard_from[i])
                {
                    initprintf("%s %s:%d...\n",first_send?"Connecting to":"Retrying",
                               static_ipstring(allowed_addresses[i].host),allowed_addresses[i].port);

                    send_peer_greeting(allowed_addresses[i].host,
                                       allowed_addresses[i].port,
                                       my_id);
                }
            }
            first_send = 0;
            resendat += CLIENT_POLL_DELAY;
        }

        idle();
        process_udp_send_queue();

        rc = get_udp_packet(&ip, &port, &packet, sizeof(packet));

        //this is so we don't get unexpected packet errors from players already heard from

        if ((rc > 0) && (ip) && ((ip != myip) || (port != udpport)))
        {
            char *ipstr = static_ipstring(ip);

            if (rc != sizeof(packet))
            {
                initprintf("mmulti_unstable: Missized packet or fragment from %s:%i ?!\n", ipstr, port);
                continue;
            }
            else if (packet.header != HEADER_PEER_GREETING)
            {
                initprintf("mmulti_unstable: Unexpected packet type from %s:%i ?!\n", ipstr, port);
                continue;
            }

            for (i=0;i<MAX_PLAYERS;i++)
                if (!heard_from[i] || heard_from[i] == B_SWAP16(packet.id)) break; // only increase once

            if (B_SWAP16(packet.id) == 1337)
            {
                remaining = 0;
                continue;
            }
            else if (heard_from[i] == 0 && B_SWAP16(packet.id) == 1)
            {
                packet.id = B_SWAP16(packet.id);
                heard_from[i] = packet.id;
//                allowed_addresses[i].host = ip;   /* bcast needs this. */
//                allowed_addresses[i].port = port;

                initprintf("Connected to %s:%i\n",
                           ipstr, port);
                initprintf("Waiting for server to launch game\n");
            }
            else
            {
//                for (i=0;i<MAX_PLAYERS;i++)
                {
                    if (heard_from[i] == 0 && B_SWAP16(packet.id) != my_id)
                    {
                        packet.id = B_SWAP16(packet.id);
                        heard_from[i] = packet.id;

                        initprintf("New player with id 0x%X\n",
                                   (int) packet.id);
                        gcom->numplayers++;
                        max++;
//                        initprintf("max %d np %d\n",max,gcom->numplayers);
                    }
                }
            }
        }
    }

    if (quitevent)
    {
        initprintf("Connection attempt aborted.\n");
        return(0);
    }

    /* ok, now everyone is talking to you. Sort them into player numbers... */

    heard_from[max] = my_id; /* so we sort, too... */
    allowed_addresses[max].host = myip;
    allowed_addresses[max].port = udpport;

    do
    {
        remaining = 0;
        for (i = 0; i < max; i++)
        {
            if (heard_from[i] == heard_from[i+1])  /* blah. */
            {
                initprintf("mmulti_unstable: ERROR: Two players have the same random ID!\n");
                initprintf("mmulti_unstable: ERROR: Please restart the game to generate new IDs.\n");
                return(0);
            }

            else if (heard_from[i] > heard_from[i+1])
            {
                int tmpi;
                short tmps;

                tmps = heard_from[i];
                heard_from[i] = heard_from[i+1];
                heard_from[i+1] = tmps;

                tmpi = allowed_addresses[i].host;
                allowed_addresses[i].host = allowed_addresses[i+1].host;
                allowed_addresses[i+1].host = tmpi;

                tmps = allowed_addresses[i].port;
                allowed_addresses[i].port = allowed_addresses[i+1].port;
                allowed_addresses[i+1].port = tmps;

                remaining = 1;  /* yay for bubble sorting! */
            }
        }
    }
    while (remaining);

    /*
     * Now we're sorted. But, the local player is referred to by both his
     *  player number and player index ZERO, so bump everyone up one to
     *  their actual index and fill in local player as item zero.
     */

    memmove(&allowed_addresses[1], &allowed_addresses[0],
            sizeof(allowed_addresses) - sizeof(allowed_addresses[0]));
    allowed_addresses[0].host = myip;

    gcom->myconnectindex = 0;
    for (i = 1; i <= gcom->numplayers; i++)
    {
        ip = (allowed_addresses[i].host);

        if (ip == myip)
        {
            if (udpport == allowed_addresses[i].port)
                gcom->myconnectindex = i;
        }

        initprintf("mmulti_unstable: player #%i with id %d\n", i,heard_from[i]);
    }
//    assert(gcom->myconnectindex);

    initprintf("mmulti_unstable: We are player #%i\n", gcom->myconnectindex);

    return(1);
}


/* peer to peer init. */
static int connect_to_everyone(gcomtype *gcom, int myip, int bcast)
{
    PacketPeerGreeting packet;
    unsigned short my_id = 0;
    int i;
    int rc;
    int ip;
    short port;
    int first_send = 1;
    unsigned short heard_from[MAX_PLAYERS];
    unsigned int resendat;
    int max;
    int remaining;

    if (bcast)
    {
        if (gcom->numplayers > 1)
        {
            initprintf("mmulti_unstable: Error: can't do both 'broadcast' and 'allow'.\n");
            return(0);
        }

        if (!set_socket_broadcast(1))
            return(0);

        gcom->numplayers = bcast + 1;
    }

    memset(heard_from, '\0', sizeof(heard_from));

    while (my_id == 0)  /* player number is based on id, low to high. */
    {
        struct timeval tv;
        gettimeofday(&tv, NULL);
        my_id = (unsigned short)tv.tv_usec; //HACK
    }


    initprintf("mmulti_unstable: Using 0x%X as client ID\n", my_id);

    resendat = getticks();
    remaining = max = gcom->numplayers - 1;

    initprintf("Waiting for %d player%s...\n", remaining, remaining==1 ? "":"s");
    if (remaining == 0)
    {
        initprintf("Hmmm... don't have time to play with myself!\n");
        return(0);
    }

    while (remaining && !quitevent)
    {
        handleevents();

        if (resendat <= getticks())
        {
            if (bcast)
            {
                initprintf("%sroadcasting greeting...\n", first_send ? "B":"Reb");
                /* !!! FIXME: This is...probably not right. */
                send_peer_greeting(0xFFFFFFFF, udpport, my_id);
            }
            else
            {
                for (i = 0; (i < max) || natfree ; i++)
                {

                    //only checking one player at a time works
                    //this is where special formatting of allow lines comes in
                    if (natfree)
                    {
                        i = itmp; //addfaz router fix
                    }

                    if (!heard_from[i])
                    {
                        initprintf("%s %s:%d...\n",first_send?"Connecting to":"Retrying",
                                   static_ipstring(allowed_addresses[i].host),allowed_addresses[i].port);

                        send_peer_greeting(allowed_addresses[i].host,
                                           allowed_addresses[i].port,
                                           my_id);
                    }

                    // If this is stun-enabled then don't loop.
                    if (natfree)
                    {
                        break;
                    }
                }
            }
            first_send = 0;
            resendat += CLIENT_POLL_DELAY;
        }

        idle();
        process_udp_send_queue();

        rc = get_udp_packet(&ip, &port, &packet, sizeof(packet));

        //this is so we don't get unexpected packet errors from players already heard from

        if (natfree)
        {
            //addfaz router/stun addition *Start*
            //this is so we are not dealing with players already heard from.
            for (i = 0; i < max; i++)
            {
                if (ip == allowed_addresses[i].host &&
                        port == allowed_addresses[i].port)
                {
                    if (heard_from[i] != 0) //if we've heard from player already.
                    {
                        rc = 0;
                    }
                }
            }
            //addfaz router/stun addition *End*
        }


        if ((rc > 0) && (ip) && ((ip != myip) || (port != udpport)))
        {
            char *ipstr = static_ipstring(ip);

            for (i = 0; i < max; i++)
            {

                ////addfaz NAT addition *START*////
                if (natfree)
                {
                    if (tmpmax[i] != 1)
                    {
                        if (allowed_addresses[i].host == ip)
                        {
                            if (allowed_addresses[i].port != port)
                            {
                                initprintf("mmulti_unstable: Port number for player %d changed from %d to %d.\n",i,allowed_addresses[i].port,port);
                                /*                                initprintf("Different player Port Number detected. %s:%i\n",ipstr,
                                                                           allowed_addresses[i].port);
                                                                initprintf("Changed to %s:%i, player may be behind a firewall.\n", ipstr, port); //addfaz NAT addition */
                                allowed_addresses[i].port = port;
                            }
                        }
                    }
                }
                ////addfaz NAT addition *END*////

                if ((ip == allowed_addresses[i].host) &&
                        (port == allowed_addresses[i].port))  //addfaz NAT line addition
                {
                    break;
                }

                if ((bcast) && (allowed_addresses[i].host == 0))
                    break;  /* select this slot. */

            }

            if (i == max)
                initprintf("mmulti_unstable: Disallowed player %s:%d ?!\n", ipstr, port);

            else if (rc != sizeof(packet))
                initprintf("mmulti_unstable: Missized packet or fragment from %s:%i ?!\n", ipstr, port);

            else if (packet.header != HEADER_PEER_GREETING)
                initprintf("mmulti_unstable: Unexpected packet type from %s:%i ?!\n", ipstr, port);

            else if (heard_from[i] == 0)
            {
                packet.id = B_SWAP16(packet.id);
                heard_from[i] = packet.id;
                allowed_addresses[i].host = ip;   /* bcast needs this. */
                allowed_addresses[i].port = port;
                remaining--;

                initprintf("Connected to %s:%i (id 0x%X). %d player%s to go.\n",
                           ipstr, port ,(int) packet.id,
                           remaining, remaining == 1 ? "" : "s");

                /* make sure they've heard from us at all... */
                /* !!! FIXME: Could be fatal if packet is dropped... */
                send_peer_greeting(allowed_addresses[i].host,
                                   allowed_addresses[i].port,
                                   my_id);

                if (natfree)
                {
                    itmp++; //addfaz router/stun addition (goto next player)
                }
                else
                {
                    tmpmax[i] = 1; //addfaz line addition
                }
            }
        }
    }

    if (quitevent)
    {
        initprintf("Connection attempt aborted.\n");
        return(0);
    }

    /* ok, now everyone is talking to you. Sort them into player numbers... */

    heard_from[max] = my_id; /* so we sort, too... */
    allowed_addresses[max].host = myip;
    allowed_addresses[max].port = udpport;

    do
    {
        remaining = 0;
        for (i = 0; i < max; i++)
        {
            if (heard_from[i] == heard_from[i+1])  /* blah. */
            {
                initprintf("mmulti_unstable: ERROR: Two players have the same random ID!\n");
                initprintf("mmulti_unstable: ERROR: Please restart the game to generate new IDs.\n");
                return(0);
            }

            else if (heard_from[i] > heard_from[i+1])
            {
                int tmpi;
                short tmps;

                tmps = heard_from[i];
                heard_from[i] = heard_from[i+1];
                heard_from[i+1] = tmps;

                tmpi = allowed_addresses[i].host;
                allowed_addresses[i].host = allowed_addresses[i+1].host;
                allowed_addresses[i+1].host = tmpi;

                tmps = allowed_addresses[i].port;
                allowed_addresses[i].port = allowed_addresses[i+1].port;
                allowed_addresses[i+1].port = tmps;

                remaining = 1;  /* yay for bubble sorting! */
            }
        }
    }
    while (remaining);

    /*
     * Now we're sorted. But, the local player is referred to by both his
     *  player number and player index ZERO, so bump everyone up one to
     *  their actual index and fill in local player as item zero.
     */

    memmove(&allowed_addresses[1], &allowed_addresses[0],
            sizeof(allowed_addresses) - sizeof(allowed_addresses[0]));
    allowed_addresses[0].host = myip;

    gcom->myconnectindex = 0;
    for (i = 1; i <= gcom->numplayers; i++)
    {
        ip = (allowed_addresses[i].host);


        if (ip == myip)
        {
            if (udpport == allowed_addresses[i].port)
                gcom->myconnectindex = i;
        }

        initprintf("mmulti_unstable: player #%i at %s:%i\n", i,static_ipstring(ip),allowed_addresses[i].port);
    }
//    assert(gcom->myconnectindex);

    initprintf("mmulti_unstable: We are player #%i\n", gcom->myconnectindex);

    /*
     * Ok, we should have specific IPs and ports for all players, and
     *  therefore shouldn't broadcast anymore. Disable permission to do so,
     *  just in case, so we aren't flooding the LAN with broadcasted packets.
     */
    set_socket_broadcast(0);

    return(1);
}

static int parse_ip(const char *str, int *ip)
{
    int ip1, ip2, ip3, ip4;

    if (Bstrcasecmp(str, "any") == 0)
    {
        *ip = 0;
        return(1);
    }

    if (sscanf(str, "%d.%d.%d.%d", &ip1, &ip2, &ip3, &ip4) != 4)
    {
        initprintf("\"%s\" is not a valid IP address.\n", str);
        return(0);
    }

    /* we _should_ check that 0 <= ip? <= 255, but it'll fail later anyhow. */

    *ip = (((ip1 & 0xFF) << 24) |
           ((ip2 & 0xFF) << 16) |
           ((ip3 & 0xFF) <<  8) |
           ((ip4 & 0xFF)));

    return(1);
}

static int parse_interface(char *str, int *ip, short *udpport)
{
    char *ptr = strchr(str, ':');
    if (ptr) /* portnum specified? */
        *ptr = '\0';

    if (!parse_ip(str, ip))
        return(0);

    *udpport = BUILD_DEFAULT_UDP_PORT;
    if (ptr != NULL)  /* port specified? */
    {
        ptr++;
        if (Bstrcasecmp(ptr, "any") == 0)
            *udpport = 0;
        else
            *udpport = (short) atoi(ptr);
    }

    return(1);
}

static int initialize_sockets(void)
{
#if PLATFORM_WIN32
    int rc;
    WSADATA data;
//    initprintf("initializing WinSock...\n");
    rc = WSAStartup(0x0101, &data);
    if (rc != 0)
    {
        initprintf("WinSock failed to initialize! [err==%d].\n", rc);
        return(0);
    }
    else
    {
        /*        initprintf("WinSock initialized.\n");
                initprintf("  - Caller uses version %d.%d, highest supported is %d.%d.\n",
                           data.wVersion >> 8, data.wVersion & 0xFF,
                           data.wHighVersion >> 8, data.wHighVersion & 0xFF);
                initprintf("  - Implementation description: [%s].\n", data.szDescription);
                initprintf("  - System status: [%s].\n", data.szSystemStatus);
                initprintf("  - Max sockets: %d.\n", data.iMaxSockets);
                initprintf("  - Max UDP datagram size: %d.\n", data.iMaxUdpDg); */
    }
#endif

    return(1);
}

static void deinitialize_sockets(void)
{
#if PLATFORM_WIN32
    WSACleanup();
#endif
}

static int parse_udp_config(const char *cfgfile, gcomtype *gcom)
{
    char *buf;
    char *tok;
    char *ptr;
    int ip = 0;  /* interface */
    int bcast = 0;

    buf = read_whole_file(cfgfile);  /* we must free this. */
    if (buf == NULL)
        return(0);

    ptr = buf;
    while ((tok = get_token(&ptr)) != NULL)
    {
        int bogus = 1;

        if (Bstrcasecmp(tok, "interface") == 0)
        {
            if ((tok = get_token(&ptr)) &&
                    (parse_interface(tok, &ip, &udpport)))
            {
                bogus = 0;
            }
            initprintf("mmulti_unstable: Using interface %s:%d\n",
                       static_ipstring(ip), (int) udpport);
        }

        else if (Bstrcasecmp(tok, "mode") == 0)
        {
            if ((tok = get_token(&ptr)) != NULL)
            {
                bogus = 0;
                if (Bstrcasecmp(tok, "server") == 0)
                    udpmode = udpmode_server;
                else if (Bstrcasecmp(tok, "client") == 0)
                    udpmode = udpmode_client;
                else if (Bstrcasecmp(tok, "peer") == 0)
                    udpmode = udpmode_peer;
                else
                    bogus = 1;

                if (!bogus)
                    initprintf("You want to be in [%s] mode\n", tok);
            }
        }

        else if (Bstrcasecmp(tok, "broadcast") == 0)
        {
            if ((tok = get_token(&ptr)) != NULL)
            {
                bcast = atoi(tok);
                if (bcast > MAX_PLAYERS - 1)
                {
                    initprintf("WARNING: Too many broadcast players.\n");
                    bcast = MAX_PLAYERS - 1;
                }

                bogus = 0;
            }
        }

        else if (Bstrcasecmp(tok, "allow") == 0)
        {
            int host;
            short port=BUILD_DEFAULT_UDP_PORT;
            if ((tok = get_token(&ptr)) != NULL)
            {
                if (gcom->numplayers >= MAX_PLAYERS - 1)
                    initprintf("WARNING: Too many allowed IP addresses.\n");

                else if (parse_interface(tok, &host, &port))
                {
                    allowed_addresses[gcom->numplayers].host = host;
                    allowed_addresses[gcom->numplayers].port = port;
                    gcom->numplayers++;
                    bogus = 0;
                }
            }
        }

        else if (Bstrcasecmp(tok, "players") == 0)
        {
            if ((tok = get_token(&ptr)) != NULL)
            {
                bogus = 0;
                if (udpmode == udpmode_server)
                    gcom->numplayers = atoi(tok)-1;
                else
                    bogus = 1;
            }
        }

        if (bogus)
            initprintf("bogus token! [%s]\n", tok);
    }

    free(buf);

    if (open_udp_socket(ip, udpport))
    {
        gcom->numplayers++;  /* that's you. */
        if (udpmode == udpmode_server)
            return(wait_for_other_players(gcom, ip));
        else if (udpmode == udpmode_client)
            return(connect_to_server(gcom, ip));
        else if (udpmode == udpmode_peer)
            return(connect_to_everyone(gcom, ip, bcast));

        initprintf("wtf?!");  /* Should be handled by a udpmode above... */
//        assert(0);
    }

    return(0);
}


gcomtype *init_network_transport(char **ARGV, int argpos)
{
    gcomtype *retval;

//    initprintf("\n\nUDP NETWORK TRANSPORT INITIALIZING...\n");

    if (!initialize_sockets())
        return(NULL);

    srand(time(NULL));

    retval = (gcomtype *)malloc(sizeof(gcomtype));
    if (retval != NULL)
    {
        int rc;
        char *cfgfile = ARGV[argpos];

        memset(retval, '\0', sizeof(gcomtype));
        memset(allowed_addresses, '\0', sizeof(allowed_addresses));
        udpsocket = -1;
        udpport = BUILD_DEFAULT_UDP_PORT;
        udpmode = udpmode_peer;

        initprintf("mmulti_unstable: Using '%s' as configuration file\n", cfgfile);
        rc = parse_udp_config(cfgfile, retval);

        if (!rc)
        {
            free(retval);
            deinit_network_transport(NULL);
            return(NULL);
        }
        retval->gametype = 3;  /* gametype: 1-serial,2-modem,3-net */
    }

    return(retval);
}


void deinit_network_transport(gcomtype *gcom)
{
//    initprintf("\n\nUDP NETWORK TRANSPORT DEINITIALIZING...\n");

    if (gcom != NULL)
    {
        initprintf("  ...freeing gcom structure...\n");
        free(gcom);
    }

    if ((signed)udpsocket != -1)
    {
        initprintf("  ...closing socket...\n");
        set_socket_blockmode(1);  /* block while socket drains. */
        shutdown(udpsocket, SOCKET_SHUTDOWN_BOTH);
        socketclose(udpsocket);
        udpsocket = -1;
    }

    deinitialize_sockets();

    initprintf("UDP net deinitialized successfully.\n");
}


void callcommit(void)
{
    int ip, i, rc;
    short port;

    if ((signed)udpsocket == -1)
        return;

    process_udp_send_queue();

    switch (gcom->command)
    {
    case COMMIT_CMD_GET:
        rc = get_udp_packet(&ip, &port, gcom->buffer, sizeof(gcom->buffer));
        if (rc > 0)
        {
            gcom->numbytes = rc;  /* size of new packet. */
            for (i = 1; i <= gcom->numplayers; i++)
            {
                if ((allowed_addresses[i].host == ip) &&
                        (allowed_addresses[i].port == port))
                {
                    gcom->other = i;
                    return;
                }
            }
            /* if you manage to hit this, it'll report no packet avail. */
        }

        gcom->numbytes = 0;
        gcom->other = -1;  /* no packet available. */
        break;

    case COMMIT_CMD_SEND:
        if ((gcom->other < 0) || (gcom->other > gcom->numplayers))
        {
            initprintf("NET TRANSPORT ERROR: send to player out of range\n");
            return;
        }

        ip = allowed_addresses[gcom->other].host;
        if (ip == 0)  /* dropped player? */
            return;

        port = allowed_addresses[gcom->other].port;

        if (!send_udp_packet(ip, port, gcom->buffer, gcom->numbytes))
        {
            initprintf("NET TRANSPORT ERROR: send failed to %s:%d\n",
                       static_ipstring(ip), (int) port);
        }
        break;

    case COMMIT_CMD_SENDTOALL:
        /* skip player zero, 'cause that's a duplicate of local IP. */
        for (i = 1; i <= gcom->numplayers; i++)
        {
            ip = allowed_addresses[i].host;
            if (ip == 0)  /* dropped player? */
                continue;

            port = allowed_addresses[i].port;

            if (!send_udp_packet(ip, port, gcom->buffer, gcom->numbytes))
            {
                initprintf("NET TRANSPORT ERROR: send failed to %s:%d\n",
                           static_ipstring(ip), (int) port);
            }
        }
        break;

    case COMMIT_CMD_SENDTOALLOTHERS:
        /* skip player zero, 'cause that's a duplicate of local IP. */
        for (i = 1; i <= gcom->numplayers; i++)
        {
            if (i == gcom->myconnectindex)  /* local player. */
                continue;

            ip = allowed_addresses[i].host;
            if (ip == 0)  /* dropped player? */
                continue;

            port = allowed_addresses[i].port;

            if (!send_udp_packet(ip, port, gcom->buffer, gcom->numbytes))
            {
                initprintf("NET TRANSPORT ERROR: send failed to %s:%d\n",
                           static_ipstring(ip), (int) port);
            }
        }
        break;

        /* ?!
        case COMMIT_CMD_SCORE:
            break;
        */

    default:
        initprintf("NET TRANSPORT ERROR: Unknown command %d\n", gcom->command);
        gcom->other = -1;  /* oh well. */
        break;
    }
}

#else
#error Please define a network transport for your platform.
#endif

/* end of mmulti.c ... */