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net_dgrm.c
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net_dgrm.c
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/*
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// net_dgrm.c
// This is enables a simple IP banning mechanism
#define BAN_TEST
#ifdef BAN_TEST
#if defined(_WIN32)
#include <windows.h>
#elif defined (NeXT)
#include <sys/socket.h>
#include <arpa/inet.h>
#else
#define AF_INET 2 /* internet */
struct in_addr
{
union
{
struct { unsigned char s_b1,s_b2,s_b3,s_b4; } S_un_b;
struct { unsigned short s_w1,s_w2; } S_un_w;
unsigned long S_addr;
} S_un;
};
#define s_addr S_un.S_addr /* can be used for most tcp & ip code */
struct sockaddr_in
{
short sin_family;
unsigned short sin_port;
struct in_addr sin_addr;
char sin_zero[8];
};
char *inet_ntoa(struct in_addr in);
unsigned long inet_addr(const char *cp);
#endif
#endif // BAN_TEST
#include "quakedef.h"
#include "net_dgrm.h"
// these two macros are to make the code more readable
#define sfunc net_landrivers[sock->landriver]
#define dfunc net_landrivers[net_landriverlevel]
static int net_landriverlevel;
/* statistic counters */
int packetsSent = 0;
int packetsReSent = 0;
int packetsReceived = 0;
int receivedDuplicateCount = 0;
int shortPacketCount = 0;
int droppedDatagrams;
static int myDriverLevel;
struct
{
unsigned int length;
unsigned int sequence;
byte data[MAX_DATAGRAM];
} packetBuffer;
extern int m_return_state;
extern int m_state;
extern qboolean m_return_onerror;
extern char m_return_reason[32];
#ifdef DEBUG
char *StrAddr (struct qsockaddr *addr)
{
static char buf[34];
byte *p = (byte *)addr;
int n;
for (n = 0; n < 16; n++)
sprintf (buf + n * 2, "%02x", *p++);
return buf;
}
#endif
#ifdef BAN_TEST
unsigned long banAddr = 0x00000000;
unsigned long banMask = 0xffffffff;
void NET_Ban_f (void)
{
char addrStr [32];
char maskStr [32];
void (*print) (char *fmt, ...);
if (cmd_source == src_command)
{
if (!sv.active)
{
Cmd_ForwardToServer ();
return;
}
print = Con_Printf;
}
else
{
if (pr_global_struct->deathmatch && !host_client->privileged)
return;
print = SV_ClientPrintf;
}
switch (Cmd_Argc ())
{
case 1:
if (((struct in_addr *)&banAddr)->s_addr)
{
Q_strcpy(addrStr, inet_ntoa(*(struct in_addr *)&banAddr));
Q_strcpy(maskStr, inet_ntoa(*(struct in_addr *)&banMask));
print("Banning %s [%s]\n", addrStr, maskStr);
}
else
print("Banning not active\n");
break;
case 2:
if (Q_strcasecmp(Cmd_Argv(1), "off") == 0)
banAddr = 0x00000000;
else
banAddr = inet_addr(Cmd_Argv(1));
banMask = 0xffffffff;
break;
case 3:
banAddr = inet_addr(Cmd_Argv(1));
banMask = inet_addr(Cmd_Argv(2));
break;
default:
print("BAN ip_address [mask]\n");
break;
}
}
#endif
int Datagram_SendMessage (qsocket_t *sock, sizebuf_t *data)
{
unsigned int packetLen;
unsigned int dataLen;
unsigned int eom;
#ifdef DEBUG
if (data->cursize == 0)
Sys_Error("Datagram_SendMessage: zero length message\n");
if (data->cursize > NET_MAXMESSAGE)
Sys_Error("Datagram_SendMessage: message too big %u\n", data->cursize);
if (sock->canSend == false)
Sys_Error("SendMessage: called with canSend == false\n");
#endif
Q_memcpy(sock->sendMessage, data->data, data->cursize);
sock->sendMessageLength = data->cursize;
if (data->cursize <= MAX_DATAGRAM)
{
dataLen = data->cursize;
eom = NETFLAG_EOM;
}
else
{
dataLen = MAX_DATAGRAM;
eom = 0;
}
packetLen = NET_HEADERSIZE + dataLen;
packetBuffer.length = BigLong(packetLen | (NETFLAG_DATA | eom));
packetBuffer.sequence = BigLong(sock->sendSequence++);
Q_memcpy (packetBuffer.data, sock->sendMessage, dataLen);
sock->canSend = false;
if (sfunc.Write (sock->socket, (byte *)&packetBuffer, packetLen, &sock->addr) == -1)
return -1;
sock->lastSendTime = net_time;
packetsSent++;
return 1;
}
int SendMessageNext (qsocket_t *sock)
{
unsigned int packetLen;
unsigned int dataLen;
unsigned int eom;
if (sock->sendMessageLength <= MAX_DATAGRAM)
{
dataLen = sock->sendMessageLength;
eom = NETFLAG_EOM;
}
else
{
dataLen = MAX_DATAGRAM;
eom = 0;
}
packetLen = NET_HEADERSIZE + dataLen;
packetBuffer.length = BigLong(packetLen | (NETFLAG_DATA | eom));
packetBuffer.sequence = BigLong(sock->sendSequence++);
Q_memcpy (packetBuffer.data, sock->sendMessage, dataLen);
sock->sendNext = false;
if (sfunc.Write (sock->socket, (byte *)&packetBuffer, packetLen, &sock->addr) == -1)
return -1;
sock->lastSendTime = net_time;
packetsSent++;
return 1;
}
int ReSendMessage (qsocket_t *sock)
{
unsigned int packetLen;
unsigned int dataLen;
unsigned int eom;
if (sock->sendMessageLength <= MAX_DATAGRAM)
{
dataLen = sock->sendMessageLength;
eom = NETFLAG_EOM;
}
else
{
dataLen = MAX_DATAGRAM;
eom = 0;
}
packetLen = NET_HEADERSIZE + dataLen;
packetBuffer.length = BigLong(packetLen | (NETFLAG_DATA | eom));
packetBuffer.sequence = BigLong(sock->sendSequence - 1);
Q_memcpy (packetBuffer.data, sock->sendMessage, dataLen);
sock->sendNext = false;
if (sfunc.Write (sock->socket, (byte *)&packetBuffer, packetLen, &sock->addr) == -1)
return -1;
sock->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 *sock)
{
return true;
}
int Datagram_SendUnreliableMessage (qsocket_t *sock, sizebuf_t *data)
{
int packetLen;
#ifdef DEBUG
if (data->cursize == 0)
Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
if (data->cursize > MAX_DATAGRAM)
Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
#endif
packetLen = NET_HEADERSIZE + data->cursize;
packetBuffer.length = BigLong(packetLen | NETFLAG_UNRELIABLE);
packetBuffer.sequence = BigLong(sock->unreliableSendSequence++);
Q_memcpy (packetBuffer.data, data->data, data->cursize);
if (sfunc.Write (sock->socket, (byte *)&packetBuffer, packetLen, &sock->addr) == -1)
return -1;
packetsSent++;
return 1;
}
int Datagram_GetMessage (qsocket_t *sock)
{
unsigned int length;
unsigned int flags;
int ret = 0;
struct qsockaddr readaddr;
unsigned int sequence;
unsigned int count;
if (!sock->canSend)
if ((net_time - sock->lastSendTime) > 1.0)
ReSendMessage (sock);
while(1)
{
length = sfunc.Read (sock->socket, (byte *)&packetBuffer, NET_DATAGRAMSIZE, &readaddr);
// if ((rand() & 255) > 220)
// continue;
if (length == 0)
break;
if (length == -1)
{
Con_Printf("Read error\n");
return -1;
}
if (sfunc.AddrCompare(&readaddr, &sock->addr) != 0)
{
#ifdef DEBUG
Con_DPrintf("Forged packet received\n");
Con_DPrintf("Expected: %s\n", StrAddr (&sock->addr));
Con_DPrintf("Received: %s\n", StrAddr (&readaddr));
#endif
continue;
}
if (length < NET_HEADERSIZE)
{
shortPacketCount++;
continue;
}
length = BigLong(packetBuffer.length);
flags = length & (~NETFLAG_LENGTH_MASK);
length &= NETFLAG_LENGTH_MASK;
if (flags & NETFLAG_CTL)
continue;
sequence = BigLong(packetBuffer.sequence);
packetsReceived++;
if (flags & NETFLAG_UNRELIABLE)
{
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 %u datagram(s)\n", count);
}
sock->unreliableReceiveSequence = sequence + 1;
length -= NET_HEADERSIZE;
SZ_Clear (&net_message);
SZ_Write (&net_message, packetBuffer.data, length);
ret = 2;
break;
}
if (flags & NETFLAG_ACK)
{
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)
{
Q_memcpy(sock->sendMessage, sock->sendMessage+MAX_DATAGRAM, sock->sendMessageLength);
sock->sendNext = true;
}
else
{
sock->sendMessageLength = 0;
sock->canSend = true;
}
continue;
}
if (flags & NETFLAG_DATA)
{
packetBuffer.length = BigLong(NET_HEADERSIZE | NETFLAG_ACK);
packetBuffer.sequence = BigLong(sequence);
sfunc.Write (sock->socket, (byte *)&packetBuffer, NET_HEADERSIZE, &readaddr);
if (sequence != sock->receiveSequence)
{
receivedDuplicateCount++;
continue;
}
sock->receiveSequence++;
length -= NET_HEADERSIZE;
if (flags & NETFLAG_EOM)
{
SZ_Clear(&net_message);
SZ_Write(&net_message, sock->receiveMessage, sock->receiveMessageLength);
SZ_Write(&net_message, packetBuffer.data, length);
sock->receiveMessageLength = 0;
ret = 1;
break;
}
Q_memcpy(sock->receiveMessage + sock->receiveMessageLength, packetBuffer.data, length);
sock->receiveMessageLength += length;
continue;
}
}
if (sock->sendNext)
SendMessageNext (sock);
return ret;
}
void PrintStats(qsocket_t *s)
{
Con_Printf("canSend = %4u \n", s->canSend);
Con_Printf("sendSeq = %4u ", s->sendSequence);
Con_Printf("recvSeq = %4u \n", s->receiveSequence);
Con_Printf("\n");
}
void NET_Stats_f (void)
{
qsocket_t *s;
if (Cmd_Argc () == 1)
{
Con_Printf("unreliable messages sent = %i\n", unreliableMessagesSent);
Con_Printf("unreliable messages recv = %i\n", unreliableMessagesReceived);
Con_Printf("reliable messages sent = %i\n", messagesSent);
Con_Printf("reliable messages received = %i\n", messagesReceived);
Con_Printf("packetsSent = %i\n", packetsSent);
Con_Printf("packetsReSent = %i\n", packetsReSent);
Con_Printf("packetsReceived = %i\n", packetsReceived);
Con_Printf("receivedDuplicateCount = %i\n", receivedDuplicateCount);
Con_Printf("shortPacketCount = %i\n", shortPacketCount);
Con_Printf("droppedDatagrams = %i\n", droppedDatagrams);
}
else if (Q_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 (Q_strcasecmp(Cmd_Argv(1), s->address) == 0)
break;
if (s == NULL)
for (s = net_freeSockets; s; s = s->next)
if (Q_strcasecmp(Cmd_Argv(1), s->address) == 0)
break;
if (s == NULL)
return;
PrintStats(s);
}
}
static qboolean testInProgress = false;
static int testPollCount;
static int testDriver;
static int testSocket;
static void Test_Poll(void);
PollProcedure testPollProcedure = {NULL, 0.0, Test_Poll};
static void Test_Poll(void)
{
struct qsockaddr clientaddr;
int control;
int len;
char name[32];
char address[64];
int colors;
int frags;
int connectTime;
byte playerNumber;
net_landriverlevel = testDriver;
while (1)
{
len = dfunc.Read (testSocket, net_message.data, net_message.maxsize, &clientaddr);
if (len < sizeof(int))
break;
net_message.cursize = len;
MSG_BeginReading ();
control = BigLong(*((int *)net_message.data));
MSG_ReadLong();
if (control == -1)
break;
if ((control & (~NETFLAG_LENGTH_MASK)) != NETFLAG_CTL)
break;
if ((control & NETFLAG_LENGTH_MASK) != len)
break;
if (MSG_ReadByte() != CCREP_PLAYER_INFO)
Sys_Error("Unexpected repsonse to Player Info request\n");
playerNumber = MSG_ReadByte();
Q_strcpy(name, MSG_ReadString());
colors = MSG_ReadLong();
frags = MSG_ReadLong();
connectTime = MSG_ReadLong();
Q_strcpy(address, MSG_ReadString());
Con_Printf("%s\n frags:%3i colors:%u %u time:%u\n %s\n", name, frags, colors >> 4, colors & 0x0f, connectTime / 60, address);
}
testPollCount--;
if (testPollCount)
{
SchedulePollProcedure(&testPollProcedure, 0.1);
}
else
{
dfunc.CloseSocket(testSocket);
testInProgress = false;
}
}
static void Test_f (void)
{
char *host;
int n;
int max = MAX_SCOREBOARD;
struct qsockaddr sendaddr;
if (testInProgress)
return;
host = Cmd_Argv (1);
if (host && hostCacheCount)
{
for (n = 0; n < hostCacheCount; n++)
if (Q_strcasecmp (host, hostcache[n].name) == 0)
{
if (hostcache[n].driver != myDriverLevel)
continue;
net_landriverlevel = hostcache[n].ldriver;
max = hostcache[n].maxusers;
Q_memcpy(&sendaddr, &hostcache[n].addr, sizeof(struct qsockaddr));
break;
}
if (n < hostCacheCount)
goto JustDoIt;
}
for (net_landriverlevel = 0; net_landriverlevel < net_numlandrivers; net_landriverlevel++)
{
if (!net_landrivers[net_landriverlevel].initialized)
continue;
// see if we can resolve the host name
if (dfunc.GetAddrFromName(host, &sendaddr) != -1)
break;
}
if (net_landriverlevel == net_numlandrivers)
return;
JustDoIt:
testSocket = dfunc.OpenSocket(0);
if (testSocket == -1)
return;
testInProgress = true;
testPollCount = 20;
testDriver = net_landriverlevel;
for (n = 0; n < max; n++)
{
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREQ_PLAYER_INFO);
MSG_WriteByte(&net_message, n);
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (testSocket, net_message.data, net_message.cursize, &sendaddr);
}
SZ_Clear(&net_message);
SchedulePollProcedure(&testPollProcedure, 0.1);
}
static qboolean test2InProgress = false;
static int test2Driver;
static int test2Socket;
static void Test2_Poll(void);
PollProcedure test2PollProcedure = {NULL, 0.0, Test2_Poll};
static void Test2_Poll(void)
{
struct qsockaddr clientaddr;
int control;
int len;
char name[256];
char value[256];
net_landriverlevel = test2Driver;
name[0] = 0;
len = dfunc.Read (test2Socket, net_message.data, net_message.maxsize, &clientaddr);
if (len < sizeof(int))
goto Reschedule;
net_message.cursize = len;
MSG_BeginReading ();
control = BigLong(*((int *)net_message.data));
MSG_ReadLong();
if (control == -1)
goto Error;
if ((control & (~NETFLAG_LENGTH_MASK)) != NETFLAG_CTL)
goto Error;
if ((control & NETFLAG_LENGTH_MASK) != len)
goto Error;
if (MSG_ReadByte() != CCREP_RULE_INFO)
goto Error;
Q_strcpy(name, MSG_ReadString());
if (name[0] == 0)
goto Done;
Q_strcpy(value, MSG_ReadString());
Con_Printf("%-16.16s %-16.16s\n", name, value);
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREQ_RULE_INFO);
MSG_WriteString(&net_message, name);
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (test2Socket, net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
Reschedule:
SchedulePollProcedure(&test2PollProcedure, 0.05);
return;
Error:
Con_Printf("Unexpected repsonse to Rule Info request\n");
Done:
dfunc.CloseSocket(test2Socket);
test2InProgress = false;
return;
}
static void Test2_f (void)
{
char *host;
int n;
struct qsockaddr sendaddr;
if (test2InProgress)
return;
host = Cmd_Argv (1);
if (host && hostCacheCount)
{
for (n = 0; n < hostCacheCount; n++)
if (Q_strcasecmp (host, hostcache[n].name) == 0)
{
if (hostcache[n].driver != myDriverLevel)
continue;
net_landriverlevel = hostcache[n].ldriver;
Q_memcpy(&sendaddr, &hostcache[n].addr, sizeof(struct qsockaddr));
break;
}
if (n < hostCacheCount)
goto JustDoIt;
}
for (net_landriverlevel = 0; net_landriverlevel < net_numlandrivers; net_landriverlevel++)
{
if (!net_landrivers[net_landriverlevel].initialized)
continue;
// see if we can resolve the host name
if (dfunc.GetAddrFromName(host, &sendaddr) != -1)
break;
}
if (net_landriverlevel == net_numlandrivers)
return;
JustDoIt:
test2Socket = dfunc.OpenSocket(0);
if (test2Socket == -1)
return;
test2InProgress = true;
test2Driver = net_landriverlevel;
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREQ_RULE_INFO);
MSG_WriteString(&net_message, "");
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (test2Socket, net_message.data, net_message.cursize, &sendaddr);
SZ_Clear(&net_message);
SchedulePollProcedure(&test2PollProcedure, 0.05);
}
int Datagram_Init (void)
{
int i;
int csock;
myDriverLevel = net_driverlevel;
Cmd_AddCommand ("net_stats", NET_Stats_f);
if (COM_CheckParm("-nolan"))
return -1;
for (i = 0; i < net_numlandrivers; i++)
{
csock = net_landrivers[i].Init ();
if (csock == -1)
continue;
net_landrivers[i].initialized = true;
net_landrivers[i].controlSock = csock;
}
#ifdef BAN_TEST
Cmd_AddCommand ("ban", NET_Ban_f);
#endif
Cmd_AddCommand ("test", Test_f);
Cmd_AddCommand ("test2", Test2_f);
return 0;
}
void Datagram_Shutdown (void)
{
int i;
//
// shutdown the lan drivers
//
for (i = 0; i < net_numlandrivers; i++)
{
if (net_landrivers[i].initialized)
{
net_landrivers[i].Shutdown ();
net_landrivers[i].initialized = false;
}
}
}
void Datagram_Close (qsocket_t *sock)
{
sfunc.CloseSocket(sock->socket);
}
void Datagram_Listen (qboolean state)
{
int i;
for (i = 0; i < net_numlandrivers; i++)
if (net_landrivers[i].initialized)
net_landrivers[i].Listen (state);
}
static qsocket_t *_Datagram_CheckNewConnections (void)
{
struct qsockaddr clientaddr;
struct qsockaddr newaddr;
int newsock;
int acceptsock;
qsocket_t *sock;
qsocket_t *s;
int len;
int command;
int control;
int ret;
acceptsock = dfunc.CheckNewConnections();
if (acceptsock == -1)
return NULL;
SZ_Clear(&net_message);
len = dfunc.Read (acceptsock, net_message.data, net_message.maxsize, &clientaddr);
if (len < sizeof(int))
return NULL;
net_message.cursize = len;
MSG_BeginReading ();
control = BigLong(*((int *)net_message.data));
MSG_ReadLong();
if (control == -1)
return NULL;
if ((control & (~NETFLAG_LENGTH_MASK)) != NETFLAG_CTL)
return NULL;
if ((control & NETFLAG_LENGTH_MASK) != len)
return NULL;
command = MSG_ReadByte();
if (command == CCREQ_SERVER_INFO)
{
if (Q_strcmp(MSG_ReadString(), "QUAKE") != 0)
return NULL;
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
dfunc.GetSocketAddr(acceptsock, &newaddr);
MSG_WriteString(&net_message, dfunc.AddrToString(&newaddr));
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, NET_PROTOCOL_VERSION);
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (acceptsock, net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
return NULL;
}
if (command == CCREQ_PLAYER_INFO)
{
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)
return NULL;
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
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(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (acceptsock, net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
return NULL;
}
if (command == CCREQ_RULE_INFO)
{
char *prevCvarName;
cvar_t *var;
// find the search start location
prevCvarName = MSG_ReadString();
if (*prevCvarName)
{
var = Cvar_FindVar (prevCvarName);
if (!var)
return NULL;
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, CCREP_RULE_INFO);
if (var)
{
MSG_WriteString(&net_message, var->name);
MSG_WriteString(&net_message, var->string);
}
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (acceptsock, net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
return NULL;
}
if (command != CCREQ_CONNECT)
return NULL;
if (Q_strcmp(MSG_ReadString(), "QUAKE") != 0)
return NULL;
if (MSG_ReadByte() != NET_PROTOCOL_VERSION)
{
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREP_REJECT);
MSG_WriteString(&net_message, "Incompatible version.\n");
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
dfunc.Write (acceptsock, net_message.data, net_message.cursize, &clientaddr);
SZ_Clear(&net_message);
return NULL;
}
#ifdef BAN_TEST
// check for a ban
if (clientaddr.sa_family == AF_INET)
{
unsigned long testAddr;
testAddr = ((struct sockaddr_in *)&clientaddr)->sin_addr.s_addr;
if ((testAddr & banMask) == banAddr)
{
SZ_Clear(&net_message);
// save space for the header, filled in later
MSG_WriteLong(&net_message, 0);
MSG_WriteByte(&net_message, CCREP_REJECT);
MSG_WriteString(&net_message, "You have been banned.\n");
*((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));