ddnet/src/engine/shared/network_console.cpp

/* (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/system.h>
#include "network.h"

bool CNetConsole::Open(NETADDR BindAddr, int Flags)
{
	// zero out the whole structure
	mem_zero(this, sizeof(*this));
	m_Socket.type = NETTYPE_INVALID;
	m_Socket.ipv4sock = -1;
	m_Socket.ipv6sock = -1;

	// open socket
	m_Socket = net_tcp_create(BindAddr);
	if(!m_Socket.type)
		return false;
	if(net_tcp_listen(m_Socket, NET_MAX_CONSOLE_CLIENTS))
		return false;
	net_set_non_blocking(m_Socket);

	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
		m_aSlots[i].m_Connection.Reset();

	return true;
}

void CNetConsole::SetCallbacks(NETFUNC_NEWCLIENT pfnNewClient, NETFUNC_DELCLIENT pfnDelClient, void *pUser)
{
	m_pfnNewClient = pfnNewClient;
	m_pfnDelClient = pfnDelClient;
	m_UserPtr = pUser;
}

int CNetConsole::Close()
{
	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
		m_aSlots[i].m_Connection.Disconnect("closing console");

	net_tcp_close(m_Socket);

	return 0;
}

int CNetConsole::Drop(int ClientID, const char *pReason)
{
	if(m_pfnDelClient)
		m_pfnDelClient(ClientID, pReason, m_UserPtr);

	m_aSlots[ClientID].m_Connection.Disconnect(pReason);

	return 0;
}

int CNetConsole::AcceptClient(NETSOCKET Socket, const NETADDR *pAddr)
{
	char aError[256] = { 0 };
	int FreeSlot = -1;
	
	// look for free slot or multiple client
	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
	{
		if(FreeSlot == -1 && m_aSlots[i].m_Connection.State() == NET_CONNSTATE_OFFLINE)
			FreeSlot = i;
		if(m_aSlots[i].m_Connection.State() != NET_CONNSTATE_OFFLINE)
		{
			NETADDR PeerAddr = m_aSlots[i].m_Connection.PeerAddress();
			if(net_addr_comp(pAddr, &PeerAddr) == 0)
			{
				str_copy(aError, "only one client per IP allowed", sizeof(aError));
				break;
			}
		}
	}

	// accept client
	if(!aError[0] && FreeSlot != -1)
	{
		m_aSlots[FreeSlot].m_Connection.Init(Socket, pAddr);
		if(m_pfnNewClient)
			m_pfnNewClient(FreeSlot, m_UserPtr);
		return 0;
	}

	// reject client
	if(!aError[0])
		str_copy(aError, "no free slot available", sizeof(aError));

	net_tcp_send(Socket, aError, str_length(aError));
	net_tcp_close(Socket);

	return -1;
}

int CNetConsole::Update()
{
	NETSOCKET Socket;
	NETADDR Addr;

	if(net_tcp_accept(m_Socket, &Socket, &Addr) > 0)
	{
		int Index = FindBan(Addr);
		if(Index == -1)
			AcceptClient(Socket, &Addr);
		else
		{
			char aBuf[128];
			if(m_aBans[Index].m_Expires > -1)
			{
				int Mins = (m_aBans[Index].m_Expires-time_timestamp()+ 59) / 60;
				if(Mins <= 1)
					str_format(aBuf, sizeof(aBuf), "You have been banned for 1 minute");
				else
					str_format(aBuf, sizeof(aBuf), "You have been banned for %d minutes", Mins);
			}
			else
				str_format(aBuf, sizeof(aBuf), "You have been banned for life");
			
			net_tcp_send(Socket, aBuf, str_length(aBuf));
			net_tcp_close(Socket);
		}
	}

	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
	{
		if(m_aSlots[i].m_Connection.State() == NET_CONNSTATE_ONLINE)
			m_aSlots[i].m_Connection.Update();
		if(m_aSlots[i].m_Connection.State() == NET_CONNSTATE_ERROR)
			Drop(i, m_aSlots[i].m_Connection.ErrorString());
	}

	UpdateBans();

	return 0;
}

int CNetConsole::Recv(char *pLine, int MaxLength, int *pClientID)
{
	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
	{
		if(m_aSlots[i].m_Connection.State() == NET_CONNSTATE_ONLINE && m_aSlots[i].m_Connection.Recv(pLine, MaxLength))
		{
			if(pClientID)
				*pClientID = i;
			return 1;
		}
	}
	return 0;
}

int CNetConsole::Send(int ClientID, const char *pLine)
{
	if(m_aSlots[ClientID].m_Connection.State() == NET_CONNSTATE_ONLINE)
		return m_aSlots[ClientID].m_Connection.Send(pLine);
	else
		return -1;
}

int CNetConsole::FindBan(NETADDR Addr)
{
	Addr.port = 0;
	for(int i = 0; i < m_NumBans; i++)
		if(net_addr_comp(&m_aBans[i].m_Addr, &Addr) == 0)
			return i;

	return -1;
}

bool CNetConsole::AddBan(NETADDR Addr, int Seconds)
{
	if(m_NumBans == MAX_BANS)
		return false;
	
	Addr.port = 0;
	int Index = FindBan(Addr);
	if(Index == -1)
	{
		Index = m_NumBans++;
		m_aBans[Index].m_Addr = Addr;
	}
	m_aBans[Index].m_Expires = Seconds>0 ? time_timestamp()+Seconds : -1;

	for(int i = 0; i < NET_MAX_CONSOLE_CLIENTS; i++)
	{
		if(m_aSlots[i].m_Connection.State() != NET_CONNSTATE_OFFLINE)
		{
			NETADDR PeerAddr = m_aSlots[i].m_Connection.PeerAddress();
			PeerAddr.port = 0;
			if(net_addr_comp(&Addr, &PeerAddr) == 0)
			{
				char aBuf[128];
				if(Seconds>0)
				{
					int Mins = (Seconds + 59) / 60;
					if(Mins <= 1)
						str_format(aBuf, sizeof(aBuf), "You have been banned for 1 minute");
					else
						str_format(aBuf, sizeof(aBuf), "You have been banned for %d minutes", Mins);
				}
				else
					str_format(aBuf, sizeof(aBuf), "You have been banned for life");
				Drop(i, aBuf);
			}
		}
	}
	return true;
}

void CNetConsole::UpdateBans()
{
	int Now = time_timestamp();
	for(int i = 0; i < m_NumBans; ++i)
		if(m_aBans[i].m_Expires > 0 && m_aBans[i].m_Expires < Now)
		{
			m_aBans[i] = m_aBans[m_NumBans-1];
			--m_NumBans;
			break;
		}
}