2 * ircd-ratbox: A slightly useful ircd.
3 * packet.c: Packet handlers.
5 * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
6 * Copyright (C) 1996-2002 Hybrid Development Team
7 * Copyright (C) 2002-2005 ircd-ratbox development team
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * $Id: packet.c 3446 2007-05-14 22:21:16Z jilles $
38 static char readBuf
[READBUF_SIZE
];
39 static void client_dopacket(struct Client
*client_p
, char *buffer
, size_t length
);
42 * parse_client_queued - parse client queued messages
45 parse_client_queued(struct Client
*client_p
)
50 if(IsAnyDead(client_p
))
53 if(IsUnknown(client_p
))
57 if(client_p
->localClient
->sent_parsed
>= client_p
->localClient
->allow_read
)
60 dolen
= rb_linebuf_get(&client_p
->localClient
->
61 buf_recvq
, readBuf
, READBUF_SIZE
,
62 LINEBUF_COMPLETE
, LINEBUF_PARSED
);
64 if(dolen
<= 0 || IsDead(client_p
))
67 client_dopacket(client_p
, readBuf
, dolen
);
68 client_p
->localClient
->sent_parsed
++;
71 if(IsAnyDead(client_p
))
73 /* if theyve dropped out of the unknown state, break and move
74 * to the parsing for their appropriate status. --fl
76 if(!IsUnknown(client_p
))
78 /* reset their flood limits, they're now
81 client_p
->localClient
->sent_parsed
= 0;
88 if(IsAnyServer(client_p
) || IsExemptFlood(client_p
))
90 while (!IsAnyDead(client_p
) && (dolen
= rb_linebuf_get(&client_p
->localClient
->buf_recvq
,
91 readBuf
, READBUF_SIZE
, LINEBUF_COMPLETE
,
94 client_dopacket(client_p
, readBuf
, dolen
);
97 else if(IsClient(client_p
))
100 if(IsOper(client_p
) && ConfigFileEntry
.no_oper_flood
)
103 * Handle flood protection here - if we exceed our flood limit on
104 * messages in this loop, we simply drop out of the loop prematurely.
109 /* This flood protection works as follows:
111 * A client is given allow_read lines to send to the server. Every
112 * time a line is parsed, sent_parsed is increased. sent_parsed
113 * is decreased by 1 every time flood_recalc is called.
115 * Thus a client can 'burst' allow_read lines to the server, any
116 * excess lines will be parsed one per flood_recalc() call.
118 * Therefore a client will be penalised more if they keep flooding,
119 * as sent_parsed will always hover around the allow_read limit
120 * and no 'bursts' will be permitted.
124 if(client_p
->localClient
->sent_parsed
>= client_p
->localClient
->allow_read
)
126 /* spb: Add second layer of throttling to n lines per second, even during burst */
127 if(client_p
->localClient
->actually_read
>= ConfigFileEntry
.client_flood_burst_rate
)
131 /* allow opers 4 times the amount of messages as users. why 4?
134 else if(client_p
->localClient
->sent_parsed
>= (4 * client_p
->localClient
->allow_read
))
137 dolen
= rb_linebuf_get(&client_p
->localClient
->
138 buf_recvq
, readBuf
, READBUF_SIZE
,
139 LINEBUF_COMPLETE
, LINEBUF_PARSED
);
144 client_dopacket(client_p
, readBuf
, dolen
);
145 if(IsAnyDead(client_p
))
148 client_p
->localClient
->sent_parsed
+= ConfigFileEntry
.client_flood_message_time
;
149 client_p
->localClient
->actually_read
++;
156 * marks the end of the clients grace period
159 flood_endgrace(struct Client
*client_p
)
161 SetFloodDone(client_p
);
163 /* Drop their flood limit back down */
164 client_p
->localClient
->allow_read
= MAX_FLOOD
;
166 /* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
169 client_p
->localClient
->sent_parsed
= 0;
175 * recalculate the number of allowed flood lines. this should be called
176 * once a second on any given client. We then attempt to flush some data.
179 flood_recalc(void *unused
)
181 rb_dlink_node
*ptr
, *next
;
182 struct Client
*client_p
;
184 RB_DLINK_FOREACH_SAFE(ptr
, next
, lclient_list
.head
)
186 client_p
= ptr
->data
;
188 if(rb_unlikely(IsMe(client_p
)))
191 if(rb_unlikely(client_p
->localClient
== NULL
))
194 if(IsFloodDone(client_p
))
195 client_p
->localClient
->sent_parsed
-= ConfigFileEntry
.client_flood_message_num
;
197 client_p
->localClient
->sent_parsed
= 0;
199 if(client_p
->localClient
->sent_parsed
< 0)
200 client_p
->localClient
->sent_parsed
= 0;
202 client_p
->localClient
->actually_read
= 0;
204 parse_client_queued(client_p
);
206 if(rb_unlikely(IsAnyDead(client_p
)))
211 RB_DLINK_FOREACH_SAFE(ptr
, next
, unknown_list
.head
)
213 client_p
= ptr
->data
;
215 if(client_p
->localClient
== NULL
)
218 client_p
->localClient
->sent_parsed
--;
220 if(client_p
->localClient
->sent_parsed
< 0)
221 client_p
->localClient
->sent_parsed
= 0;
223 client_p
->localClient
->actually_read
= 0;
225 parse_client_queued(client_p
);
230 * read_packet - Read a 'packet' of data from a connection and process it.
233 read_packet(rb_fde_t
* F
, void *data
)
235 struct Client
*client_p
= data
;
240 #ifdef USE_IODEBUG_HOOKS
246 if(IsAnyDead(client_p
))
250 * Read some data. We *used to* do anti-flood protection here, but
251 * I personally think it makes the code too hairy to make sane.
254 length
= rb_read(client_p
->localClient
->F
, readBuf
, READBUF_SIZE
);
258 if(rb_ignore_errno(errno
))
259 rb_setselect(client_p
->localClient
->F
,
260 RB_SELECT_READ
, read_packet
, client_p
);
262 error_exit_client(client_p
, length
);
267 error_exit_client(client_p
, length
);
271 #ifdef USE_IODEBUG_HOOKS
272 hdata
.client
= client_p
;
273 hdata
.arg1
= readBuf
;
275 call_hook(h_iorecv_id
, &hdata
);
278 if(client_p
->localClient
->lasttime
< rb_current_time())
279 client_p
->localClient
->lasttime
= rb_current_time();
280 client_p
->flags
&= ~FLAGS_PINGSENT
;
283 * Before we even think of parsing what we just read, stick
284 * it on the end of the receive queue and do it when its
287 if(IsHandshake(client_p
) || IsUnknown(client_p
))
290 lbuf_len
= rb_linebuf_parse(&client_p
->localClient
->buf_recvq
, readBuf
, length
, binary
);
292 if(IsAnyDead(client_p
))
295 /* Attempt to parse what we have */
296 parse_client_queued(client_p
);
298 if(IsAnyDead(client_p
))
301 /* Check to make sure we're not flooding */
302 if(!IsAnyServer(client_p
) &&
303 (rb_linebuf_alloclen(&client_p
->localClient
->buf_recvq
) > ConfigFileEntry
.client_flood_max_lines
))
305 if(!(ConfigFileEntry
.no_oper_flood
&& IsOper(client_p
)))
307 exit_client(client_p
, client_p
, client_p
, "Excess Flood");
312 /* bail if short read */
313 if(length
< READBUF_SIZE
)
315 rb_setselect(client_p
->localClient
->F
, RB_SELECT_READ
, read_packet
, client_p
);
322 * client_dopacket - copy packet to client buf and parse it
323 * client_p - pointer to client structure for which the buffer data
325 * buffer - pointr to the buffer containing the newly read data
326 * length - number of valid bytes of data in the buffer
329 * It is implicitly assumed that dopacket is called only
330 * with client_p of "local" variation, which contains all the
331 * necessary fields (buffer etc..)
334 client_dopacket(struct Client
*client_p
, char *buffer
, size_t length
)
336 s_assert(client_p
!= NULL
);
337 s_assert(buffer
!= NULL
);
339 if(client_p
== NULL
|| buffer
== NULL
)
341 if(IsAnyDead(client_p
))
344 * Update messages received
346 ++me
.localClient
->receiveM
;
347 ++client_p
->localClient
->receiveM
;
350 * Update bytes received
352 client_p
->localClient
->receiveB
+= length
;
354 if(client_p
->localClient
->receiveB
> 1023)
356 client_p
->localClient
->receiveK
+= (client_p
->localClient
->receiveB
>> 10);
357 client_p
->localClient
->receiveB
&= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
360 me
.localClient
->receiveB
+= length
;
362 if(me
.localClient
->receiveB
> 1023)
364 me
.localClient
->receiveK
+= (me
.localClient
->receiveB
>> 10);
365 me
.localClient
->receiveB
&= 0x03ff;
368 parse(client_p
, buffer
, buffer
+ length
);