void GameEchoPing(session_node *s)
{
unsigned int token;
if (!s || s->state != STATE_GAME ||
!s->game || s->game->game_state != GAME_NORMAL ||
s->conn.type == CONN_CONSOLE)
{
if (s)
{
s->secure_token = 0;
s->sliding_token = NULL;
}
return;
}
// BP_PING is sign that client is still alive.
// We return a BP_ECHO_PING in response.
// We also take this opportunity to choose a new security token,
// and tack it onto the BP_ECHO_PING.
//
// NOTE: This may be called anytime; the client can handle
// unrequested BP_ECHO_PINGs to synchronize the security token.
token = (s->seeds[0] & 0xFF);
AddByteToPacket(BP_ECHO_PING);
AddByteToPacket((unsigned char)(token ^ 0xED));
AddIntToPacket(GetSecurityRedbookID());
SendPacket(s->session_id);
s->secure_token = token;
s->sliding_token = GetSecurityRedbook();
}
void SecurePacketBufferList(int session_id, buffer_node *bl)
{
session_node *s = GetSessionByID(session_id);
char* pRedbook;
if (!session_id || !s || !s->account || !s->account->account_id ||
s->conn.type == CONN_CONSOLE)
{
//dprintf("SecurePacketBufferList cannot find session %i", session_id);
return;
}
if (s->version_major < 4)
{
return;
}
if (bl == NULL || bl->buf == NULL)
{
// dprintf("SecurePacketBufferList can't use invalid buffer list");
return;
}
// dprintf("Securing msg %u with %u", (unsigned char)bl->buf[0], (unsigned char)(s->secure_token & 0xFF));
bl->buf[0] ^= (unsigned char)(s->secure_token & 0xFF);
pRedbook = GetSecurityRedbook();
if (s->sliding_token && pRedbook)
{
if (s->sliding_token < pRedbook ||
s->sliding_token > pRedbook+strlen(pRedbook))
{
lprintf("SecurePacketBufferList lost redbook on session %i account %i (%s), may break session\n",
session_id, s->account->account_id, s->account->name);
s->sliding_token = pRedbook;
}
s->secure_token += ((*s->sliding_token) & 0x7F);
s->sliding_token++;
if (*s->sliding_token == '\0')
s->sliding_token = pRedbook;
}
}
