boolean HGetPacket (void)
{
if (reboundpacket)
{
*netbuffer = reboundstore;
doomcom->remotenode = 0;
reboundpacket = false;
return true;
}
if (!netgame)
return false;
if (demoplayback)
return false;
doomcom->command = CMD_GET;
I_NetCmd ();
if (doomcom->remotenode == -1)
return false;
if (doomcom->datalength != NetbufferSize ())
{
if (debugfile)
fprintf (debugfile,"bad packet length %i\n",doomcom->datalength);
return false;
}
if (NetbufferChecksum () != (netbuffer->checksum&NCMD_CHECKSUM) )
{
if (debugfile)
fprintf (debugfile,"bad packet checksum\n");
return false;
}
if (debugfile)
{
int realretrans;
int i;
if (netbuffer->checksum & NCMD_SETUP)
fprintf (debugfile,"setup packet\n");
else
{
if (netbuffer->checksum & NCMD_RETRANSMIT)
realretrans = ExpandTics (netbuffer->retransmitfrom);
else
realretrans = -1;
fprintf (debugfile,"get %i = (%i + %i, R %i)[%i] ",doomcom->remotenode,
ExpandTics(netbuffer->starttic),netbuffer->numtics, realretrans, doomcom->datalength);
for (i=0 ; i<doomcom->datalength ; i++)
fprintf (debugfile,"%i ",((byte *)netbuffer)[i]);
fprintf (debugfile,"\n");
}
}
return true;
}
//
// HSendPacket
//
void
HSendPacket
(int node,
int flags )
{
netbuffer->checksum = NetbufferChecksum () | flags;
if (!node)
{
reboundstore = *netbuffer;
reboundpacket = true;
return;
}
if (demoplayback)
return;
if (!netgame)
I_Error ("Tried to transmit to another node");
doomcom->command = CMD_SEND;
doomcom->remotenode = node;
doomcom->datalength = NetbufferSize ();
#if 0 // AJH HACK
if (debugfile)
{
int i;
int realretrans;
if (netbuffer->checksum & NCMD_RETRANSMIT)
realretrans = ExpandTics (netbuffer->retransmitfrom);
else
realretrans = -1;
I_DBGprintf("send (%i + %i, R %i) [%i] ",
ExpandTics(netbuffer->starttic),
netbuffer->numtics, realretrans, doomcom->datalength);
for (i=0 ; i<doomcom->datalength ; i++)
I_DBGprintf("%i ",((byte *)netbuffer)[i]);
I_DBGprintf("\n");
}
#endif
I_NetCmd ();
}
void ipx_receive(int s) {
ipxpacket_t buf;
int rc;
struct sockaddr from;
size_t sl = sizeof(from);
rc = recvfrom(s,&buf,sizeof buf,0,&from,&sl);
if (rc == -1) {
fprintf(stderr,"read(ipx): %s\n", strerror(errno));
exit(-2);
}
if (rc > 0) {
if (buf.tic == -1) {
// Setup packet
if (!connected++) {
connect(s,&from,sl);
send_udp_packet(PKT_INIT,0,NULL,0);
}
} else {
if (buf.u.d.checksum & NCMD_SETUP) {
printf("setup packet, dropped\n");
} else if (buf.u.d.checksum & NCMD_EXIT) {
send_udp_packet(PKT_QUIT,buf.u.d.starttic,NULL,0);
exit(0);
} else if ((buf.u.d.checksum & NCMD_CHECKSUM) == buf.u.d.checksum) {
// No flags, normal game packet
char outbuf[100];
int tics;
outbuf[0] = tics = buf.u.d.numtics;
outbuf[1] = buf.u.d.player;
for (int i=0; i< tics; i++)
TicToRaw(outbuf+2+i*sizeof(ticcmd_t),&buf.u.d.cmds[i]);
send_udp_packet(PKT_TICC, ExpandTics(buf.u.d.starttic, basetic), outbuf, 2+tics*sizeof(ticcmd_t));
}
}
}
}
static void DebugPrintpacket(const char *header)
{
fprintf(debugfile, "%-12s (node %d,ack %d,ackret %d,size %d) type(%d) : %s\n",
header, doomcom->remotenode, netbuffer->ack, netbuffer->ackreturn, doomcom->datalength,
netbuffer->packettype, packettypename[netbuffer->packettype]);
switch (netbuffer->packettype)
{
case PT_ASKINFO:
case PT_ASKINFOVIAMS:
fprintf(debugfile, " time %u\n", (tic_t)LONG(netbuffer->u.askinfo.time) );
break;
case PT_CLIENTJOIN:
fprintf(debugfile, " number %d mode %d\n", netbuffer->u.clientcfg.localplayers,
netbuffer->u.clientcfg.mode);
break;
case PT_SERVERTICS:
fprintf(debugfile, " firsttic %u ply %d tics %d ntxtcmd %s\n ",
(UINT32)ExpandTics(netbuffer->u.serverpak.starttic), netbuffer->u.serverpak.numslots,
netbuffer->u.serverpak.numtics,
sizeu1((size_t)(&((UINT8 *)netbuffer)[doomcom->datalength] - (UINT8 *)&netbuffer->u.serverpak.cmds[netbuffer->u.serverpak.numslots*netbuffer->u.serverpak.numtics])));
fprintfstring((char *)&netbuffer->u.serverpak.cmds[netbuffer->u.serverpak.numslots*netbuffer->u.serverpak.numtics],(size_t)(
&((UINT8 *)netbuffer)[doomcom->datalength] - (UINT8 *)&netbuffer->u.serverpak.cmds[netbuffer->u.serverpak.numslots*netbuffer->u.serverpak.numtics]));
break;
case PT_CLIENTCMD:
case PT_CLIENT2CMD:
case PT_CLIENTMIS:
case PT_CLIENT2MIS:
case PT_NODEKEEPALIVE:
case PT_NODEKEEPALIVEMIS:
fprintf(debugfile, " tic %4u resendfrom %u\n",
(UINT32)ExpandTics(netbuffer->u.clientpak.client_tic),
(UINT32)ExpandTics (netbuffer->u.clientpak.resendfrom));
break;
case PT_TEXTCMD:
case PT_TEXTCMD2:
fprintf(debugfile, " length %d\n ", netbuffer->u.textcmd[0]);
fprintfstring((char *)netbuffer->u.textcmd+1, netbuffer->u.textcmd[0]);
break;
case PT_SERVERCFG:
fprintf(debugfile, " playerslots %d clientnode %d serverplayer %d "
"gametic %u gamestate %d gametype %d modifiedgame %d\n",
netbuffer->u.servercfg.totalslotnum, netbuffer->u.servercfg.clientnode,
netbuffer->u.servercfg.serverplayer, (UINT32)LONG(netbuffer->u.servercfg.gametic),
netbuffer->u.servercfg.gamestate, netbuffer->u.servercfg.gametype,
netbuffer->u.servercfg.modifiedgame);
break;
case PT_SERVERINFO:
fprintf(debugfile, " '%s' player %d/%d, map %s, filenum %d, time %u \n",
netbuffer->u.serverinfo.servername, netbuffer->u.serverinfo.numberofplayer,
netbuffer->u.serverinfo.maxplayer, netbuffer->u.serverinfo.mapname,
netbuffer->u.serverinfo.fileneedednum,
(UINT32)LONG(netbuffer->u.serverinfo.time));
fprintfstring((char *)netbuffer->u.serverinfo.fileneeded,
(UINT8)((UINT8 *)netbuffer + doomcom->datalength
- (UINT8 *)netbuffer->u.serverinfo.fileneeded));
break;
case PT_SERVERREFUSE:
fprintf(debugfile, " reason %s\n", netbuffer->u.serverrefuse.reason);
break;
case PT_FILEFRAGMENT:
fprintf(debugfile, " fileid %d datasize %d position %u\n",
netbuffer->u.filetxpak.fileid, (UINT16)SHORT(netbuffer->u.filetxpak.size),
(UINT32)LONG(netbuffer->u.filetxpak.position));
break;
case PT_REQUESTFILE:
default: // write as a raw packet
fprintfstring((char *)netbuffer->u.textcmd,
(UINT8)((UINT8 *)netbuffer + doomcom->datalength - (UINT8 *)netbuffer->u.textcmd));
break;
}
}
void GetPackets (void)
{
int netconsole;
int netnode;
ticcmd_t *src, *dest;
int realend;
int realstart;
while ( HGetPacket() )
{
if (netbuffer->checksum & NCMD_SETUP)
continue; // extra setup packet
netconsole = netbuffer->player & ~PL_DRONE;
netnode = doomcom->remotenode;
// to save bytes, only the low byte of tic numbers are sent
// Figure out what the rest of the bytes are
realstart = ExpandTics (netbuffer->starttic);
realend = (realstart+netbuffer->numtics);
// check for exiting the game
if (netbuffer->checksum & NCMD_EXIT)
{
if (!nodeingame[netnode])
continue;
nodeingame[netnode] = false;
playeringame[netconsole] = false;
strcpy (exitmsg, "Player 1 left the game");
exitmsg[7] += netconsole;
players[consoleplayer].message = exitmsg;
if (demorecording)
G_CheckDemoStatus ();
continue;
}
// check for a remote game kill
if (netbuffer->checksum & NCMD_KILL)
I_Error ("Killed by network driver");
nodeforplayer[netconsole] = netnode;
// check for retransmit request
if ( resendcount[netnode] <= 0
&& (netbuffer->checksum & NCMD_RETRANSMIT) )
{
resendto[netnode] = ExpandTics(netbuffer->retransmitfrom);
if (debugfile)
fprintf (debugfile,"retransmit from %i\n", resendto[netnode]);
resendcount[netnode] = RESENDCOUNT;
}
else
resendcount[netnode]--;
// check for out of order / duplicated packet
if (realend == nettics[netnode])
continue;
if (realend < nettics[netnode])
{
if (debugfile)
fprintf (debugfile,
"out of order packet (%i + %i)\n" ,
realstart,netbuffer->numtics);
continue;
}
// check for a missed packet
if (realstart > nettics[netnode])
{
// stop processing until the other system resends the missed tics
if (debugfile)
fprintf (debugfile,
"missed tics from %i (%i - %i)\n",
netnode, realstart, nettics[netnode]);
remoteresend[netnode] = true;
continue;
}
// update command store from the packet
{
int start;
remoteresend[netnode] = false;
start = nettics[netnode] - realstart;
src = &netbuffer->cmds[start];
while (nettics[netnode] < realend)
{
dest = &netcmds[netconsole][nettics[netnode]%BACKUPTICS];
nettics[netnode]++;
*dest = *src;
src++;
}
}
}
}