ref: 514a8b2f0585cd37d2ad9000dca4827ee4fa462d
dir: /net_dgrm.c/
#include <u.h>
#include <libc.h>
#include <ip.h>
#include "dat.h"
#include "quakedef.h"
#include "fns.h"
//#define DEBUG
// these two macros are to make the code more readable
#define sfunc landrv[sock->landriver]
#define dfunc landrv[net_landriverlevel]
static int net_landriverlevel;
/* statistic counters */
int packetsSent;
int packetsReSent;
int packetsReceived;
int receivedDuplicateCount;
int shortPacketCount;
int droppedDatagrams;
static int myDriverLevel;
static uchar netbuf[4+4+NET_MAXMESSAGE];
extern int m_return_state;
extern int m_state;
extern qboolean m_return_onerror;
extern char m_return_reason[32];
static int
netpack(Addr *a, int f, uint seq, uchar *buf, int n)
{
hnputl(netbuf, NET_HEADERSIZE + n | f);
hnputl(netbuf+4, seq);
if(buf != nil)
memcpy(netbuf+8, buf, n);
return udpwrite(netbuf, NET_HEADERSIZE + n, a);
}
int Datagram_SendMessage (qsocket_t *s, sizebuf_t *data)
{
unsigned int n;
unsigned int eom;
#ifdef DEBUG
if (data->cursize == 0)
fatal("Datagram_SendMessage: zero length message\n");
if (data->cursize > NET_MAXMESSAGE)
fatal("Datagram_SendMessage: message too big %ud\n", data->cursize);
if (s->canSend == false)
fatal("SendMessage: called with canSend == false\n");
#endif
memcpy(s->sendMessage, data->data, data->cursize);
s->sendMessageLength = data->cursize;
if(data->cursize <= MAX_DATAGRAM){
n = data->cursize;
eom = NFEOM;
}else{
n = MAX_DATAGRAM;
eom = 0;
}
s->canSend = false;
if(netpack(&s->addr, NFDAT|eom, s->sendSequence++, s->sendMessage, n) < 0)
return -1;
s->lastSendTime = net_time;
packetsSent++;
return 1;
}
int SendMessageNext (qsocket_t *s)
{
unsigned int n;
unsigned int eom;
if(s->sendMessageLength <= MAX_DATAGRAM){
n = s->sendMessageLength;
eom = NFEOM;
}else{
n = MAX_DATAGRAM;
eom = 0;
}
s->sendNext = false;
if(netpack(&s->addr, NFDAT|eom, s->sendSequence++, s->sendMessage, n) < 0)
return -1;
s->lastSendTime = net_time;
packetsSent++;
return 1;
}
int ReSendMessage (qsocket_t *s)
{
unsigned int n;
unsigned int eom;
if (s->sendMessageLength <= MAX_DATAGRAM)
{
n = s->sendMessageLength;
eom = NFEOM;
}
else
{
n = MAX_DATAGRAM;
eom = 0;
}
s->sendNext = false;
if(netpack(&s->addr, NFDAT|eom, s->sendSequence-1, s->sendMessage, n) < 0)
return -1;
s->lastSendTime = net_time;
packetsReSent++;
return 1;
}
qboolean Datagram_CanSendMessage (qsocket_t *sock)
{
if (sock->sendNext)
SendMessageNext (sock);
return sock->canSend;
}
qboolean Datagram_CanSendUnreliableMessage (qsocket_t *)
{
return true;
}
int Datagram_SendUnreliableMessage (qsocket_t *s, sizebuf_t *data)
{
#ifdef DEBUG
if (data->cursize == 0)
fatal("Datagram_SendUnreliableMessage: zero length message\n");
if (data->cursize > MAX_DATAGRAM)
fatal("Datagram_SendUnreliableMessage: message too big %ud\n", data->cursize);
#endif
if(netpack(&s->addr, NFUNREL, s->unreliableSendSequence++, data->data, data->cursize) < 0)
return -1;
packetsSent++;
return 1;
}
int Datagram_GetMessage (qsocket_t *sock)
{
int n;
unsigned int flags;
int ret = 0;
unsigned int sequence;
unsigned int count;
if (!sock->canSend)
if ((net_time - sock->lastSendTime) > 1.0)
ReSendMessage (sock);
while(1)
{
if((n = udpread(netbuf, NET_MAXMESSAGE, &sock->addr)) == 0)
break;
if (n == -1)
{
Con_Printf("Read error\n");
return -1;
}
if (n < NET_HEADERSIZE)
{
shortPacketCount++;
continue;
}
n = nhgetl(netbuf);
flags = n & (~NFMASK);
n &= NFMASK;
if (flags & NFCTL)
continue;
sequence = nhgetl(netbuf+4);
packetsReceived++;
if (flags & NFUNREL)
{
if (sequence < sock->unreliableReceiveSequence)
{
Con_DPrintf("Got a stale datagram\n");
ret = 0;
break;
}
if (sequence != sock->unreliableReceiveSequence)
{
count = sequence - sock->unreliableReceiveSequence;
droppedDatagrams += count;
Con_DPrintf("Dropped %ud datagram(s)\n", count);
}
sock->unreliableReceiveSequence = sequence + 1;
n -= NET_HEADERSIZE;
SZ_Clear (&net_message);
SZ_Write (&net_message, netbuf+8, n);
ret = 2;
break;
}
if (flags & NFACK)
{
if (sequence != (sock->sendSequence - 1))
{
Con_DPrintf("Stale ACK received\n");
continue;
}
if (sequence == sock->ackSequence)
{
sock->ackSequence++;
if (sock->ackSequence != sock->sendSequence)
Con_DPrintf("ack sequencing error\n");
}
else
{
Con_DPrintf("Duplicate ACK received\n");
continue;
}
sock->sendMessageLength -= MAX_DATAGRAM;
if (sock->sendMessageLength > 0)
{
memcpy(sock->sendMessage, sock->sendMessage+MAX_DATAGRAM, sock->sendMessageLength);
sock->sendNext = true;
}
else
{
sock->sendMessageLength = 0;
sock->canSend = true;
}
continue;
}
if (flags & NFDAT)
{
netpack(&sock->addr, NFACK, sequence, nil, 0);
if (sequence != sock->receiveSequence)
{
receivedDuplicateCount++;
continue;
}
sock->receiveSequence++;
n -= NET_HEADERSIZE;
if (flags & NFEOM)
{
SZ_Clear(&net_message);
SZ_Write(&net_message, sock->receiveMessage, sock->receiveMessageLength);
SZ_Write(&net_message, netbuf+8, n);
sock->receiveMessageLength = 0;
ret = 1;
break;
}
memcpy(sock->receiveMessage + sock->receiveMessageLength, netbuf+8, n);
sock->receiveMessageLength += n;
continue;
}
}
if (sock->sendNext)
SendMessageNext (sock);
return ret;
}
void PrintStats(qsocket_t *s)
{
Con_Printf("canSend = %4d \n", s->canSend);
Con_Printf("sendSeq = %4d ", s->sendSequence);
Con_Printf("recvSeq = %4d \n", s->receiveSequence);
Con_Printf("\n");
}
void NET_Stats_f (void)
{
qsocket_t *s;
if (Cmd_Argc () == 1)
{
Con_Printf("unreliable messages sent = %d\n", unreliableMessagesSent);
Con_Printf("unreliable messages recv = %d\n", unreliableMessagesReceived);
Con_Printf("reliable messages sent = %d\n", messagesSent);
Con_Printf("reliable messages received = %d\n", messagesReceived);
Con_Printf("packetsSent = %d\n", packetsSent);
Con_Printf("packetsReSent = %d\n", packetsReSent);
Con_Printf("packetsReceived = %d\n", packetsReceived);
Con_Printf("receivedDuplicateCount = %d\n", receivedDuplicateCount);
Con_Printf("shortPacketCount = %d\n", shortPacketCount);
Con_Printf("droppedDatagrams = %d\n", droppedDatagrams);
}
else if(strcmp(Cmd_Argv(1), "*") == 0)
{
for (s = net_activeSockets; s; s = s->next)
PrintStats(s);
for (s = net_freeSockets; s; s = s->next)
PrintStats(s);
}
else
{
for (s = net_activeSockets; s; s = s->next)
if(cistrcmp(Cmd_Argv(1), s->address) == 0)
break;
if (s == nil)
for (s = net_freeSockets; s; s = s->next)
if(cistrcmp(Cmd_Argv(1), s->address) == 0)
break;
if (s == nil)
return;
PrintStats(s);
}
}
int
Datagram_Init(void)
{
int i;
myDriverLevel = net_driverlevel;
Cmd_AddCommand("net_stats", NET_Stats_f);
for(i=0; i<net_numlandrivers; i++){
if(landrv[i].Init() < 0)
continue;
landrv[i].initialized = true;
}
return 0;
}
void Datagram_Shutdown (void)
{
int i;
//
// shutdown the lan drivers
//
for (i = 0; i < net_numlandrivers; i++)
{
if (landrv[i].initialized)
{
landrv[i].Shutdown ();
landrv[i].initialized = false;
}
}
}
static qsocket_t *_Datagram_CheckNewConnections (void)
{
Addr clientaddr;
int newsock;
qsocket_t *sock;
qsocket_t *s;
int len;
int command;
int control;
memset(&clientaddr, 0, sizeof clientaddr);
if(getnewcon(&clientaddr) == 0)
return nil;
SZ_Clear(&net_message);
len = udpread(net_message.data, net_message.maxsize, &clientaddr);
if (len < sizeof(s32int))
goto done;
net_message.cursize = len;
MSG_BeginReading ();
control = BigLong(*((int *)net_message.data));
MSG_ReadLong();
if (control == -1)
goto done;
if ((control & (~NFMASK)) != NFCTL)
goto done;
if ((control & NFMASK) != len)
goto done;
command = MSG_ReadByte();
if (command == CQSVINFO)
{
if(strcmp(MSG_ReadString(), "QUAKE") != 0)
goto done;
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPSVINFO);
MSG_WriteString(&net_message, dfunc.AddrToString(&myip));
MSG_WriteString(&net_message, hostname.string);
MSG_WriteString(&net_message, sv.name);
MSG_WriteByte(&net_message, net_activeconnections);
MSG_WriteByte(&net_message, svs.maxclients);
MSG_WriteByte(&net_message, NETVERSION);
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
if (command == CQPLINFO)
{
int playerNumber;
int activeNumber;
int clientNumber;
client_t *client;
playerNumber = MSG_ReadByte();
activeNumber = -1;
for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
{
if (client->active)
{
activeNumber++;
if (activeNumber == playerNumber)
break;
}
}
if (clientNumber == svs.maxclients)
goto done;
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPPLINFO);
MSG_WriteByte(&net_message, playerNumber);
MSG_WriteString(&net_message, client->name);
MSG_WriteLong(&net_message, client->colors);
MSG_WriteLong(&net_message, (int)client->edict->v.frags);
MSG_WriteLong(&net_message, (int)(net_time - client->netconnection->connecttime));
MSG_WriteString(&net_message, client->netconnection->address);
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
if (command == CQRUINFO)
{
char *prevCvarName;
cvar_t *var;
// find the search start location
prevCvarName = MSG_ReadString();
if (*prevCvarName)
{
var = Cvar_FindVar (prevCvarName);
if (!var)
goto done;
var = var->next;
}
else
var = cvar_vars;
// search for the next server cvar
while (var)
{
if (var->server)
break;
var = var->next;
}
// send the response
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPRUINFO);
if (var)
{
MSG_WriteString(&net_message, var->name);
MSG_WriteString(&net_message, var->string);
}
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
if (command != CQCONNECT)
goto done;
if(strcmp(MSG_ReadString(), "QUAKE") != 0)
goto done;
if (MSG_ReadByte() != NETVERSION)
{
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPREJECT);
MSG_WriteString(&net_message, "Incompatible version.\n");
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
// see if this guy is already connected
for (s = net_activeSockets; s; s = s->next)
{
if (s->driver != net_driverlevel)
continue;
if(strcmp(clientaddr.ip, s->addr.ip) != 0 || strcmp(clientaddr.srv, s->addr.srv) != 0)
continue;
// is this a duplicate connection reqeust?
if(strcmp(clientaddr.srv, s->addr.srv) == 0
&& net_time - s->connecttime < 2.0)
{
// yes, so send a duplicate reply
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPACCEPT);
MSG_WriteLong(&net_message, dfunc.GetSocketPort(&myip));
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
// it's somebody coming back in from a crash/disconnect
// so close the old qsocket and let their retry get them back in
NET_Close(s);
goto done;
}
// allocate a QSocket
sock = NET_NewQSocket ();
if (sock == nil)
{
// no room; try to let him know
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPREJECT);
MSG_WriteString(&net_message, "Server is full.\n");
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
goto done;
}
// allocate a network socket
newsock = 1;
// everything is allocated, just fill in the details
sock->socket = newsock;
sock->landriver = net_landriverlevel;
memcpy(&sock->addr, &clientaddr, sizeof clientaddr);
strcpy(sock->address, UDP_AddrToString(&clientaddr));
// send him back the info about the server connection he has been allocated
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CPACCEPT);
MSG_WriteLong(&net_message, dfunc.GetSocketPort(&myip));
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
return sock;
done:
close(clientaddr.fd);
return nil;
}
qsocket_t *Datagram_CheckNewConnections (void)
{
qsocket_t *ret = nil;
for (net_landriverlevel = 0; net_landriverlevel < net_numlandrivers; net_landriverlevel++)
if (landrv[net_landriverlevel].initialized)
if ((ret = _Datagram_CheckNewConnections ()) != nil)
break;
return ret;
}
static qsocket_t *_Datagram_Connect (char *host)
{
Addr sendaddr;
Addr readaddr;
qsocket_t *sock;
int ret = 0;
int reps;
double start_time;
int control;
char *reason;
memset(&sendaddr, 0, sizeof sendaddr);
memset(&readaddr, 0, sizeof readaddr);
// see if we can resolve the host name
if (dfunc.getip(host, &sendaddr) == -1){
return nil;
}
sock = NET_NewQSocket ();
if (sock == nil)
goto ErrorReturn2;
sock->socket = 1;
sock->landriver = net_landriverlevel;
// connect to the host
if (dfunc.Connect(&sendaddr) == -1)
goto ErrorReturn;
memcpy(&readaddr, &sendaddr, sizeof readaddr);
// send the connection request
Con_Printf("trying...\n"); SCR_UpdateScreen ();
start_time = net_time;
UDP_Listen(1);
for (reps = 0; reps < 3; reps++)
{
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CQCONNECT);
MSG_WriteString(&net_message, "QUAKE");
MSG_WriteByte(&net_message, NETVERSION);
*((int *)net_message.data) = BigLong(NFCTL | (net_message.cursize & NFMASK));
dfunc.Write(net_message.data, net_message.cursize, &sendaddr);
SZ_Clear(&net_message);
do
{
ret = dfunc.Read(net_message.data, net_message.maxsize, &readaddr);
// if we got something, validate it
if (ret > 0)
{
if (ret < sizeof(int))
{
ret = 0;
continue;
}
net_message.cursize = ret;
MSG_BeginReading ();
control = BigLong(*((int *)net_message.data));
MSG_ReadLong();
if (control == -1)
{
ret = 0;
continue;
}
if ((control & (~NFMASK)) != NFCTL)
{
ret = 0;
continue;
}
if ((control & NFMASK) != ret)
{
ret = 0;
continue;
}
}
}
while (ret == 0 && (SetNetTime() - start_time) < 2.5);
if (ret)
break;
Con_Printf("still trying...\n"); SCR_UpdateScreen ();
start_time = SetNetTime();
}
/* bullshit workaround for non-plan9 servers replying from different
* ports. because of this workaround, multiple instances on the same
* host all require different ports prior to connection. if someone
* has a better solution, i'm all ears. */
start_time = SetNetTime();
do{
if(getnewcon(&sendaddr) > 0){
close(readaddr.fd);
memcpy(&readaddr, &sendaddr, sizeof readaddr);
break;
}
sleep(1);
}while(SetNetTime() - start_time < 2.5);
UDP_Listen(0);
if (ret == 0)
{
reason = "No Response";
Con_Printf("%s\n", reason);
strcpy(m_return_reason, reason);
goto ErrorReturn;
}
if (ret == -1)
{
reason = "Network Error";
Con_Printf("%s\n", reason);
strcpy(m_return_reason, reason);
goto ErrorReturn;
}
ret = MSG_ReadByte();
if (ret == CPREJECT)
{
reason = MSG_ReadString();
Con_Printf(reason);
strncpy(m_return_reason, reason, 31);
goto ErrorReturn;
}
if (ret == CPACCEPT)
{
memcpy(&sock->addr, &readaddr, sizeof readaddr);
dfunc.SetSocketPort (&sock->addr, MSG_ReadLong());
}
else
{
reason = "Bad Response";
Con_Printf("%s\n", reason);
strcpy(m_return_reason, reason);
goto ErrorReturn;
}
strcpy(sock->address, dfunc.AddrToString(&sendaddr));
Con_Printf ("Connection accepted\n");
sock->lastMessageTime = SetNetTime();
m_return_onerror = false;
return sock;
ErrorReturn:
close(readaddr.fd);
NET_FreeQSocket(sock);
ErrorReturn2:
if (m_return_onerror)
{
key_dest = key_menu;
m_state = m_return_state;
m_return_onerror = false;
}
return nil;
}
qsocket_t *Datagram_Connect (char *host)
{
qsocket_t *ret = nil;
for (net_landriverlevel = 0; net_landriverlevel < net_numlandrivers; net_landriverlevel++)
if (landrv[net_landriverlevel].initialized)
if ((ret = _Datagram_Connect (host)) != nil)
break;
return ret;
}
void
Datagram_Close(qsocket_t *s)
{
close(s->addr.fd);
}