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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com. */
#include <base/math.h>
#include <base/system.h>
struct CPacket
{
CPacket *m_pPrev;
CPacket *m_pNext;
NETADDR m_SendTo;
int64 m_Timestamp;
int m_ID;
int m_DataSize;
char m_aData[1];
};
static CPacket *m_pFirst = (CPacket *)0;
static CPacket *m_pLast = (CPacket *)0;
static int m_CurrentLatency = 0;
struct CPingConfig
{
int m_Base;
int m_Flux;
int m_Spike;
int m_Loss;
int m_Delay;
int m_DelayFreq;
};
static CPingConfig m_aConfigPings[] = {
// base flux spike loss delay delayfreq
{0, 0, 0, 0, 0, 0},
{40, 20, 100, 0, 0, 0},
{140, 40, 200, 0, 0, 0},
};
static int m_ConfigNumpingconfs = sizeof(m_aConfigPings)/sizeof(CPingConfig);
static int m_ConfigInterval = 10; // seconds between different pingconfigs
static int m_ConfigLog = 0;
static int m_ConfigReorder = 0;
void Run(unsigned short Port, NETADDR Dest)
{
NETADDR Src = {NETTYPE_IPV4, {0,0,0,0}, Port};
NETSOCKET Socket = net_udp_create(Src, 0);
char aBuffer[1024*2];
int ID = 0;
int Delaycounter = 0;
while(1)
{
static int Lastcfg = 0;
int n = ((time_get()/time_freq())/m_ConfigInterval) % m_ConfigNumpingconfs;
CPingConfig Ping = m_aConfigPings[n];
if(n != Lastcfg)
dbg_msg("crapnet", "cfg = %d", n);
Lastcfg = n;
// handle incomming packets
while(1)
{
// fetch data
int DataTrash = 0;
NETADDR From;
int Bytes = net_udp_recv(Socket, &From, aBuffer, 1024*2);
if(Bytes <= 0)
break;
if((random_int()%100) < Ping.m_Loss) // drop the packet
{
if(m_ConfigLog)
dbg_msg("crapnet", "dropped packet");
continue;
}
// create new packet
CPacket *p = (CPacket *)mem_alloc(sizeof(CPacket)+Bytes);
if(net_addr_comp(&From, &Dest, true) == 0)
p->m_SendTo = Src; // from the server
else
{
Src = From; // from the client
p->m_SendTo = Dest;
}
// queue packet
p->m_pPrev = m_pLast;
p->m_pNext = 0;
if(m_pLast)
m_pLast->m_pNext = p;
else
{
m_pFirst = p;
m_pLast = p;
}
m_pLast = p;
// set data in packet
p->m_Timestamp = time_get();
p->m_DataSize = Bytes;
p->m_ID = ID++;
mem_copy(p->m_aData, aBuffer, Bytes);
if(ID > 20 && Bytes > 6 && DataTrash)
{
p->m_aData[6+(random_int()%(Bytes-6))] = random_int()&255; // modify a byte
if((random_int()%10) == 0)
{
p->m_DataSize -= random_int()%32;
if(p->m_DataSize < 6)
p->m_DataSize = 6;
}
}
if(Delaycounter <= 0)
{
if(Ping.m_Delay)
p->m_Timestamp += (time_freq()*1000)/Ping.m_Delay;
Delaycounter = Ping.m_DelayFreq;
}
Delaycounter--;
if(m_ConfigLog)
{
char aAddrStr[NETADDR_MAXSTRSIZE];
net_addr_str(&From, aAddrStr, sizeof(aAddrStr), true);
dbg_msg("crapnet", "<< %08d %s (%d)", p->m_ID, aAddrStr, p->m_DataSize);
}
}
//
/*while(1)
{*/
CPacket *p = 0;
CPacket *pNext = m_pFirst;
while(1)
{
p = pNext;
if(!p)
break;
pNext = p->m_pNext;
if((time_get()-p->m_Timestamp) > m_CurrentLatency)
{
char aFlags[] = " ";
if(m_ConfigReorder && (random_int()%2) == 0 && p->m_pNext)
{
aFlags[0] = 'R';
p = m_pFirst->m_pNext;
}
if(p->m_pNext)
p->m_pNext->m_pPrev = p->m_pPrev;
else
m_pLast = p->m_pPrev;
if(p->m_pPrev)
p->m_pPrev->m_pNext = p->m_pNext;
else
m_pFirst = p->m_pNext;
/*CPacket *cur = first;
while(cur)
{
dbg_assert(cur != p, "p still in list");
cur = cur->next;
}*/
// send and remove packet
//if((random_int()%20) != 0) // heavy packetloss
net_udp_send(Socket, &p->m_SendTo, p->m_aData, p->m_DataSize);
// update lag
double Flux = random_int()/(double)RAND_MAX;
int MsSpike = Ping.m_Spike;
int MsFlux = Ping.m_Flux;
int MsPing = Ping.m_Base;
m_CurrentLatency = ((time_freq()*MsPing)/1000) + (int64)(((time_freq()*MsFlux)/1000)*Flux); // 50ms
if(MsSpike && (p->m_ID%100) == 0)
{
m_CurrentLatency += (time_freq()*MsSpike)/1000;
aFlags[1] = 'S';
}
if(m_ConfigLog)
{
char aAddrStr[NETADDR_MAXSTRSIZE];
net_addr_str(&p->m_SendTo, aAddrStr, sizeof(aAddrStr), true);
dbg_msg("crapnet", ">> %08d %s (%d) %s", p->m_ID, aAddrStr, p->m_DataSize, aFlags);
}
mem_free(p);
}
}
thread_sleep(1);
}
}
int main(int argc, const char **argv)
{
NETADDR Addr = {NETTYPE_IPV4, {127,0,0,1},8303};
dbg_logger_stdout();
Run(8302, Addr);
return 0;
}
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