elemental-ircd/src/packet.c

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/*
* ircd-ratbox: A slightly useful ircd.
* packet.c: Packet handlers.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
*
* 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
*
* $Id: packet.c 3446 2007-05-14 22:21:16Z jilles $
*/
#include "stdinc.h"
#include "s_conf.h"
#include "s_serv.h"
#include "client.h"
#include "common.h"
#include "ircd.h"
#include "parse.h"
#include "packet.h"
#include "irc_string.h"
#include "hook.h"
#include "send.h"
static char readBuf[READBUF_SIZE];
static void client_dopacket(struct Client *client_p, char *buffer, size_t length);
/*
* parse_client_queued - parse client queued messages
*/
static void
parse_client_queued(struct Client *client_p)
{
int dolen = 0;
int checkflood = 1;
if(IsAnyDead(client_p))
return;
if(IsUnknown(client_p))
{
for (;;)
{
if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read)
break;
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dolen = rb_linebuf_get(&client_p->localClient->
buf_recvq, readBuf, READBUF_SIZE,
LINEBUF_COMPLETE, LINEBUF_PARSED);
if(dolen <= 0 || IsDead(client_p))
break;
client_dopacket(client_p, readBuf, dolen);
client_p->localClient->sent_parsed++;
/* He's dead cap'n */
if(IsAnyDead(client_p))
return;
/* if theyve dropped out of the unknown state, break and move
* to the parsing for their appropriate status. --fl
*/
if(!IsUnknown(client_p))
{
/* reset their flood limits, they're now
* graced to flood
*/
client_p->localClient->sent_parsed = 0;
break;
}
}
}
if(IsAnyServer(client_p) || IsExemptFlood(client_p))
{
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while (!IsAnyDead(client_p) && (dolen = rb_linebuf_get(&client_p->localClient->buf_recvq,
readBuf, READBUF_SIZE, LINEBUF_COMPLETE,
LINEBUF_PARSED)) > 0)
{
client_dopacket(client_p, readBuf, dolen);
}
}
else if(IsClient(client_p))
{
if(IsOper(client_p) && ConfigFileEntry.no_oper_flood)
checkflood = 0;
/*
* Handle flood protection here - if we exceed our flood limit on
* messages in this loop, we simply drop out of the loop prematurely.
* -- adrian
*/
for (;;)
{
/* This flood protection works as follows:
*
* A client is given allow_read lines to send to the server. Every
* time a line is parsed, sent_parsed is increased. sent_parsed
* is decreased by 1 every time flood_recalc is called.
*
* Thus a client can 'burst' allow_read lines to the server, any
* excess lines will be parsed one per flood_recalc() call.
*
* Therefore a client will be penalised more if they keep flooding,
* as sent_parsed will always hover around the allow_read limit
* and no 'bursts' will be permitted.
*/
if(checkflood)
{
if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read)
break;
}
/* allow opers 4 times the amount of messages as users. why 4?
* why not. :) --fl_
*/
else if(client_p->localClient->sent_parsed >= (4 * client_p->localClient->allow_read))
break;
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dolen = rb_linebuf_get(&client_p->localClient->
buf_recvq, readBuf, READBUF_SIZE,
LINEBUF_COMPLETE, LINEBUF_PARSED);
if(!dolen)
break;
client_dopacket(client_p, readBuf, dolen);
if(IsAnyDead(client_p))
return;
client_p->localClient->sent_parsed++;
}
}
}
/* flood_endgrace()
*
* marks the end of the clients grace period
*/
void
flood_endgrace(struct Client *client_p)
{
SetFloodDone(client_p);
/* Drop their flood limit back down */
client_p->localClient->allow_read = MAX_FLOOD;
/* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
* so reset it.
*/
client_p->localClient->sent_parsed = 0;
}
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/*
* flood_recalc
*
* recalculate the number of allowed flood lines. this should be called
* once a second on any given client. We then attempt to flush some data.
*/
void
flood_recalc(void *unused)
{
rb_dlink_node *ptr, *next;
struct Client *client_p;
RB_DLINK_FOREACH_SAFE(ptr, next, lclient_list.head)
{
client_p = ptr->data;
if(unlikely(IsMe(client_p)))
continue;
if(unlikely(client_p->localClient == NULL))
continue;
if(IsFloodDone(client_p))
client_p->localClient->sent_parsed -= 2;
else
client_p->localClient->sent_parsed = 0;
if(client_p->localClient->sent_parsed < 0)
client_p->localClient->sent_parsed = 0;
if(--client_p->localClient->actually_read < 0)
client_p->localClient->actually_read = 0;
parse_client_queued(client_p);
if(unlikely(IsAnyDead(client_p)))
continue;
}
RB_DLINK_FOREACH_SAFE(ptr, next, unknown_list.head)
{
client_p = ptr->data;
if(client_p->localClient == NULL)
continue;
client_p->localClient->sent_parsed--;
if(client_p->localClient->sent_parsed < 0)
client_p->localClient->sent_parsed = 0;
if(--client_p->localClient->actually_read < 0)
client_p->localClient->actually_read = 0;
parse_client_queued(client_p);
}
}
/*
* read_packet - Read a 'packet' of data from a connection and process it.
*/
void
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read_packet(rb_fde_t * F, void *data)
{
struct Client *client_p = data;
struct LocalUser *lclient_p = client_p->localClient;
int length = 0;
int lbuf_len;
int binary = 0;
#ifdef USE_IODEBUG_HOOKS
hook_data_int hdata;
#endif
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while(1)
{
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if(IsAnyDead(client_p))
return;
/*
* Read some data. We *used to* do anti-flood protection here, but
* I personally think it makes the code too hairy to make sane.
* -- adrian
*/
length = rb_read(client_p->localClient->F, readBuf, READBUF_SIZE);
if(length <= 0)
{
if(length < 0 && rb_ignore_errno(errno))
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{
rb_setselect(client_p->localClient->F,
RB_SELECT_READ, read_packet, client_p);
} else
error_exit_client(client_p, length);
return;
}
if(length == 0)
{
error_exit_client(client_p, length);
return;
}
#ifdef USE_IODEBUG_HOOKS
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hdata.client = client_p;
hdata.arg1 = readBuf;
hdata.arg2 = length;
call_hook(h_iorecv_id, &hdata);
#endif
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if(client_p->localClient->lasttime < rb_current_time())
client_p->localClient->lasttime = rb_current_time();
client_p->flags &= ~FLAGS_PINGSENT;
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/*
* Before we even think of parsing what we just read, stick
* it on the end of the receive queue and do it when its
* turn comes around.
*/
if(IsHandshake(client_p) || IsUnknown(client_p))
binary = 1;
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lbuf_len = rb_linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary);
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lclient_p->actually_read += lbuf_len;
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if(IsAnyDead(client_p))
return;
/* Attempt to parse what we have */
parse_client_queued(client_p);
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if(IsAnyDead(client_p))
return;
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/* Check to make sure we're not flooding */
if(!IsAnyServer(client_p) &&
(rb_linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood))
{
if(!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
{
exit_client(client_p, client_p, client_p, "Excess Flood");
return;
}
}
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/* bail if short read */
if(length < READBUF_SIZE)
{
rb_setselect(client_p->localClient->F, RB_SELECT_READ, read_packet, client_p);
return;
}
}
}
/*
* client_dopacket - copy packet to client buf and parse it
* client_p - pointer to client structure for which the buffer data
* applies.
* buffer - pointr to the buffer containing the newly read data
* length - number of valid bytes of data in the buffer
*
* Note:
* It is implicitly assumed that dopacket is called only
* with client_p of "local" variation, which contains all the
* necessary fields (buffer etc..)
*/
void
client_dopacket(struct Client *client_p, char *buffer, size_t length)
{
s_assert(client_p != NULL);
s_assert(buffer != NULL);
if(client_p == NULL || buffer == NULL)
return;
if(IsAnyDead(client_p))
return;
/*
* Update messages received
*/
++me.localClient->receiveM;
++client_p->localClient->receiveM;
/*
* Update bytes received
*/
client_p->localClient->receiveB += length;
if(client_p->localClient->receiveB > 1023)
{
client_p->localClient->receiveK += (client_p->localClient->receiveB >> 10);
client_p->localClient->receiveB &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
}
me.localClient->receiveB += length;
if(me.localClient->receiveB > 1023)
{
me.localClient->receiveK += (me.localClient->receiveB >> 10);
me.localClient->receiveB &= 0x03ff;
}
parse(client_p, buffer, buffer + length);
}