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
36 static char readBuf
[READBUF_SIZE
];
37 static void client_dopacket(struct Client
*client_p
, char *buffer
, size_t length
);
40 * parse_client_queued - parse client queued messages
43 parse_client_queued(struct Client
*client_p
)
48 if(IsAnyDead(client_p
))
51 if(IsUnknown(client_p
))
53 allow_read
= ConfigFileEntry
.client_flood_burst_max
;
56 if(client_p
->localClient
->sent_parsed
>= allow_read
)
59 dolen
= rb_linebuf_get(&client_p
->localClient
->
60 buf_recvq
, readBuf
, READBUF_SIZE
,
61 LINEBUF_COMPLETE
, LINEBUF_PARSED
);
63 if(dolen
<= 0 || IsDead(client_p
))
66 client_dopacket(client_p
, readBuf
, dolen
);
67 client_p
->localClient
->sent_parsed
++;
70 if(IsAnyDead(client_p
))
72 /* if theyve dropped out of the unknown state, break and move
73 * to the parsing for their appropriate status. --fl
75 if(!IsUnknown(client_p
))
77 /* reset their flood limits, they're now
80 client_p
->localClient
->sent_parsed
= 0;
85 /* If sent_parsed is impossibly high, drop it down.
86 * This is useful if the configuration is changed.
88 if(client_p
->localClient
->sent_parsed
> allow_read
)
89 client_p
->localClient
->sent_parsed
= allow_read
;
92 if(IsAnyServer(client_p
) || IsExemptFlood(client_p
))
94 while (!IsAnyDead(client_p
) && (dolen
= rb_linebuf_get(&client_p
->localClient
->buf_recvq
,
95 readBuf
, READBUF_SIZE
, LINEBUF_COMPLETE
,
98 client_dopacket(client_p
, readBuf
, dolen
);
101 else if(IsClient(client_p
))
103 if(IsFloodDone(client_p
))
104 allow_read
= ConfigFileEntry
.client_flood_burst_max
;
106 allow_read
= ConfigFileEntry
.client_flood_burst_rate
;
107 allow_read
*= ConfigFileEntry
.client_flood_message_time
;
108 /* allow opers 4 times the amount of messages as users. why 4?
111 if(IsOper(client_p
) && ConfigFileEntry
.no_oper_flood
)
114 * Handle flood protection here - if we exceed our flood limit on
115 * messages in this loop, we simply drop out of the loop prematurely.
120 /* This flood protection works as follows:
122 * A client is given allow_read lines to send to the server. Every
123 * time a line is parsed, sent_parsed is increased. sent_parsed
124 * is decreased by 1 every time flood_recalc is called.
126 * Thus a client can 'burst' allow_read lines to the server, any
127 * excess lines will be parsed one per flood_recalc() call.
129 * Therefore a client will be penalised more if they keep flooding,
130 * as sent_parsed will always hover around the allow_read limit
131 * and no 'bursts' will be permitted.
133 if(client_p
->localClient
->sent_parsed
>= allow_read
)
136 dolen
= rb_linebuf_get(&client_p
->localClient
->
137 buf_recvq
, readBuf
, READBUF_SIZE
,
138 LINEBUF_COMPLETE
, LINEBUF_PARSED
);
143 client_dopacket(client_p
, readBuf
, dolen
);
144 if(IsAnyDead(client_p
))
147 client_p
->localClient
->sent_parsed
+= ConfigFileEntry
.client_flood_message_time
;
149 /* If sent_parsed is impossibly high, drop it down.
150 * This is useful if the configuration is changed.
152 if(client_p
->localClient
->sent_parsed
> allow_read
+
153 ConfigFileEntry
.client_flood_message_time
- 1)
154 client_p
->localClient
->sent_parsed
= allow_read
+
155 ConfigFileEntry
.client_flood_message_time
- 1;
161 * marks the end of the clients grace period
164 flood_endgrace(struct Client
*client_p
)
166 SetFloodDone(client_p
);
168 /* sent_parsed could be way over client_flood_burst_max but under
169 * client_flood_burst_rate so reset it.
171 client_p
->localClient
->sent_parsed
= 0;
177 * recalculate the number of allowed flood lines. this should be called
178 * once a second on any given client. We then attempt to flush some data.
181 flood_recalc(void *unused
)
183 rb_dlink_node
*ptr
, *next
;
184 struct Client
*client_p
;
186 RB_DLINK_FOREACH_SAFE(ptr
, next
, lclient_list
.head
)
188 client_p
= ptr
->data
;
190 if(rb_unlikely(IsMe(client_p
)))
193 if(rb_unlikely(client_p
->localClient
== NULL
))
196 if(IsFloodDone(client_p
))
197 client_p
->localClient
->sent_parsed
-= ConfigFileEntry
.client_flood_message_num
;
199 client_p
->localClient
->sent_parsed
= 0;
201 if(client_p
->localClient
->sent_parsed
< 0)
202 client_p
->localClient
->sent_parsed
= 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 parse_client_queued(client_p
);
228 * read_packet - Read a 'packet' of data from a connection and process it.
231 read_packet(rb_fde_t
* F
, void *data
)
233 struct Client
*client_p
= data
;
239 if(IsAnyDead(client_p
))
243 * Read some data. We *used to* do anti-flood protection here, but
244 * I personally think it makes the code too hairy to make sane.
247 length
= rb_read(client_p
->localClient
->F
, readBuf
, READBUF_SIZE
);
251 if(rb_ignore_errno(errno
))
252 rb_setselect(client_p
->localClient
->F
,
253 RB_SELECT_READ
, read_packet
, client_p
);
255 error_exit_client(client_p
, length
);
260 error_exit_client(client_p
, length
);
264 if(client_p
->localClient
->lasttime
< rb_current_time())
265 client_p
->localClient
->lasttime
= rb_current_time();
266 client_p
->flags
&= ~FLAGS_PINGSENT
;
269 * Before we even think of parsing what we just read, stick
270 * it on the end of the receive queue and do it when its
273 if(IsHandshake(client_p
) || IsUnknown(client_p
))
276 (void) rb_linebuf_parse(&client_p
->localClient
->buf_recvq
, readBuf
, length
, binary
);
278 if(IsAnyDead(client_p
))
281 /* Attempt to parse what we have */
282 parse_client_queued(client_p
);
284 if(IsAnyDead(client_p
))
287 /* Check to make sure we're not flooding */
288 if(!IsAnyServer(client_p
) &&
289 (rb_linebuf_alloclen(&client_p
->localClient
->buf_recvq
) > ConfigFileEntry
.client_flood_max_lines
))
291 if(!(ConfigFileEntry
.no_oper_flood
&& IsOper(client_p
)))
293 exit_client(client_p
, client_p
, client_p
, "Excess Flood");
298 /* bail if short read */
299 if(length
< READBUF_SIZE
)
301 rb_setselect(client_p
->localClient
->F
, RB_SELECT_READ
, read_packet
, client_p
);
308 * client_dopacket - copy packet to client buf and parse it
309 * client_p - pointer to client structure for which the buffer data
311 * buffer - pointr to the buffer containing the newly read data
312 * length - number of valid bytes of data in the buffer
315 * It is implicitly assumed that dopacket is called only
316 * with client_p of "local" variation, which contains all the
317 * necessary fields (buffer etc..)
320 client_dopacket(struct Client
*client_p
, char *buffer
, size_t length
)
322 s_assert(client_p
!= NULL
);
323 s_assert(buffer
!= NULL
);
325 if(client_p
== NULL
|| buffer
== NULL
)
327 if(IsAnyDead(client_p
))
330 * Update messages received
332 ++me
.localClient
->receiveM
;
333 ++client_p
->localClient
->receiveM
;
336 * Update bytes received
338 client_p
->localClient
->receiveB
+= length
;
340 if(client_p
->localClient
->receiveB
> 1023)
342 client_p
->localClient
->receiveK
+= (client_p
->localClient
->receiveB
>> 10);
343 client_p
->localClient
->receiveB
&= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */
346 me
.localClient
->receiveB
+= length
;
348 if(me
.localClient
->receiveB
> 1023)
350 me
.localClient
->receiveK
+= (me
.localClient
->receiveB
>> 10);
351 me
.localClient
->receiveB
&= 0x03ff;
354 parse(client_p
, buffer
, buffer
+ length
);