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54ac8b60 VY |
1 | /* |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * packet.c: Packet handlers. | |
4 | * | |
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 | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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 | |
22 | * USA | |
23 | * | |
24 | * $Id: packet.c 3446 2007-05-14 22:21:16Z jilles $ | |
25 | */ | |
26 | #include "stdinc.h" | |
27 | #include "s_conf.h" | |
28 | #include "s_serv.h" | |
29 | #include "client.h" | |
30 | #include "common.h" | |
31 | #include "ircd.h" | |
32 | #include "parse.h" | |
33 | #include "packet.h" | |
4562c604 | 34 | #include "match.h" |
54ac8b60 VY |
35 | #include "hook.h" |
36 | #include "send.h" | |
77d3d2db | 37 | #include "s_assert.h" |
54ac8b60 VY |
38 | |
39 | static char readBuf[READBUF_SIZE]; | |
40 | static void client_dopacket(struct Client *client_p, char *buffer, size_t length); | |
41 | ||
54ac8b60 VY |
42 | /* |
43 | * parse_client_queued - parse client queued messages | |
44 | */ | |
45 | static void | |
46 | parse_client_queued(struct Client *client_p) | |
47 | { | |
48 | int dolen = 0; | |
d182b854 | 49 | int allow_read; |
54ac8b60 VY |
50 | |
51 | if(IsAnyDead(client_p)) | |
52 | return; | |
53 | ||
54 | if(IsUnknown(client_p)) | |
55 | { | |
d182b854 | 56 | allow_read = ConfigFileEntry.client_flood_burst_max; |
54ac8b60 VY |
57 | for (;;) |
58 | { | |
d182b854 | 59 | if(client_p->localClient->sent_parsed >= allow_read) |
54ac8b60 VY |
60 | break; |
61 | ||
60eb0cdc | 62 | dolen = rb_linebuf_get(&client_p->localClient-> |
54ac8b60 VY |
63 | buf_recvq, readBuf, READBUF_SIZE, |
64 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
65 | ||
66 | if(dolen <= 0 || IsDead(client_p)) | |
67 | break; | |
68 | ||
69 | client_dopacket(client_p, readBuf, dolen); | |
70 | client_p->localClient->sent_parsed++; | |
71 | ||
72 | /* He's dead cap'n */ | |
73 | if(IsAnyDead(client_p)) | |
74 | return; | |
75 | /* if theyve dropped out of the unknown state, break and move | |
76 | * to the parsing for their appropriate status. --fl | |
77 | */ | |
78 | if(!IsUnknown(client_p)) | |
79 | { | |
80 | /* reset their flood limits, they're now | |
81 | * graced to flood | |
82 | */ | |
83 | client_p->localClient->sent_parsed = 0; | |
84 | break; | |
85 | } | |
86 | ||
87 | } | |
5a72f20c JT |
88 | /* If sent_parsed is impossibly high, drop it down. |
89 | * This is useful if the configuration is changed. | |
90 | */ | |
91 | if(client_p->localClient->sent_parsed > allow_read) | |
92 | client_p->localClient->sent_parsed = allow_read; | |
54ac8b60 VY |
93 | } |
94 | ||
95 | if(IsAnyServer(client_p) || IsExemptFlood(client_p)) | |
96 | { | |
60eb0cdc | 97 | while (!IsAnyDead(client_p) && (dolen = rb_linebuf_get(&client_p->localClient->buf_recvq, |
54ac8b60 VY |
98 | readBuf, READBUF_SIZE, LINEBUF_COMPLETE, |
99 | LINEBUF_PARSED)) > 0) | |
100 | { | |
101 | client_dopacket(client_p, readBuf, dolen); | |
102 | } | |
103 | } | |
104 | else if(IsClient(client_p)) | |
105 | { | |
d182b854 JT |
106 | if(IsFloodDone(client_p)) |
107 | allow_read = ConfigFileEntry.client_flood_burst_max; | |
108 | else | |
109 | allow_read = ConfigFileEntry.client_flood_burst_rate; | |
a75bf40d | 110 | allow_read *= ConfigFileEntry.client_flood_message_time; |
d182b854 JT |
111 | /* allow opers 4 times the amount of messages as users. why 4? |
112 | * why not. :) --fl_ | |
113 | */ | |
54ac8b60 | 114 | if(IsOper(client_p) && ConfigFileEntry.no_oper_flood) |
d182b854 | 115 | allow_read *= 4; |
54ac8b60 VY |
116 | /* |
117 | * Handle flood protection here - if we exceed our flood limit on | |
118 | * messages in this loop, we simply drop out of the loop prematurely. | |
119 | * -- adrian | |
120 | */ | |
121 | for (;;) | |
122 | { | |
123 | /* This flood protection works as follows: | |
124 | * | |
125 | * A client is given allow_read lines to send to the server. Every | |
126 | * time a line is parsed, sent_parsed is increased. sent_parsed | |
127 | * is decreased by 1 every time flood_recalc is called. | |
128 | * | |
129 | * Thus a client can 'burst' allow_read lines to the server, any | |
130 | * excess lines will be parsed one per flood_recalc() call. | |
131 | * | |
132 | * Therefore a client will be penalised more if they keep flooding, | |
133 | * as sent_parsed will always hover around the allow_read limit | |
134 | * and no 'bursts' will be permitted. | |
135 | */ | |
d182b854 | 136 | if(client_p->localClient->sent_parsed >= allow_read) |
54ac8b60 VY |
137 | break; |
138 | ||
60eb0cdc | 139 | dolen = rb_linebuf_get(&client_p->localClient-> |
54ac8b60 VY |
140 | buf_recvq, readBuf, READBUF_SIZE, |
141 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
142 | ||
143 | if(!dolen) | |
144 | break; | |
145 | ||
146 | client_dopacket(client_p, readBuf, dolen); | |
147 | if(IsAnyDead(client_p)) | |
148 | return; | |
e6e54763 SB |
149 | |
150 | client_p->localClient->sent_parsed += ConfigFileEntry.client_flood_message_time; | |
54ac8b60 | 151 | } |
5a72f20c JT |
152 | /* If sent_parsed is impossibly high, drop it down. |
153 | * This is useful if the configuration is changed. | |
154 | */ | |
155 | if(client_p->localClient->sent_parsed > allow_read + | |
156 | ConfigFileEntry.client_flood_message_time - 1) | |
157 | client_p->localClient->sent_parsed = allow_read + | |
158 | ConfigFileEntry.client_flood_message_time - 1; | |
54ac8b60 VY |
159 | } |
160 | } | |
161 | ||
162 | /* flood_endgrace() | |
163 | * | |
164 | * marks the end of the clients grace period | |
165 | */ | |
166 | void | |
167 | flood_endgrace(struct Client *client_p) | |
168 | { | |
169 | SetFloodDone(client_p); | |
170 | ||
d182b854 JT |
171 | /* sent_parsed could be way over client_flood_burst_max but under |
172 | * client_flood_burst_rate so reset it. | |
54ac8b60 VY |
173 | */ |
174 | client_p->localClient->sent_parsed = 0; | |
175 | } | |
176 | ||
1087485c JT |
177 | /* |
178 | * flood_recalc | |
179 | * | |
180 | * recalculate the number of allowed flood lines. this should be called | |
181 | * once a second on any given client. We then attempt to flush some data. | |
182 | */ | |
183 | void | |
184 | flood_recalc(void *unused) | |
185 | { | |
186 | rb_dlink_node *ptr, *next; | |
187 | struct Client *client_p; | |
188 | ||
189 | RB_DLINK_FOREACH_SAFE(ptr, next, lclient_list.head) | |
190 | { | |
191 | client_p = ptr->data; | |
192 | ||
af41336a | 193 | if(rb_unlikely(IsMe(client_p))) |
1087485c | 194 | continue; |
55abcbb2 | 195 | |
af41336a | 196 | if(rb_unlikely(client_p->localClient == NULL)) |
1087485c | 197 | continue; |
55abcbb2 | 198 | |
1087485c | 199 | if(IsFloodDone(client_p)) |
e6e54763 | 200 | client_p->localClient->sent_parsed -= ConfigFileEntry.client_flood_message_num; |
1087485c JT |
201 | else |
202 | client_p->localClient->sent_parsed = 0; | |
55abcbb2 | 203 | |
1087485c JT |
204 | if(client_p->localClient->sent_parsed < 0) |
205 | client_p->localClient->sent_parsed = 0; | |
206 | ||
1087485c | 207 | parse_client_queued(client_p); |
55abcbb2 | 208 | |
af41336a | 209 | if(rb_unlikely(IsAnyDead(client_p))) |
1087485c JT |
210 | continue; |
211 | ||
212 | } | |
213 | ||
214 | RB_DLINK_FOREACH_SAFE(ptr, next, unknown_list.head) | |
215 | { | |
216 | client_p = ptr->data; | |
217 | ||
218 | if(client_p->localClient == NULL) | |
219 | continue; | |
220 | ||
221 | client_p->localClient->sent_parsed--; | |
222 | ||
223 | if(client_p->localClient->sent_parsed < 0) | |
224 | client_p->localClient->sent_parsed = 0; | |
225 | ||
1087485c JT |
226 | parse_client_queued(client_p); |
227 | } | |
54ac8b60 VY |
228 | } |
229 | ||
54ac8b60 VY |
230 | /* |
231 | * read_packet - Read a 'packet' of data from a connection and process it. | |
232 | */ | |
233 | void | |
d91ce397 | 234 | read_packet(rb_fde_t * F, void *data) |
54ac8b60 VY |
235 | { |
236 | struct Client *client_p = data; | |
54ac8b60 | 237 | int length = 0; |
54ac8b60 VY |
238 | |
239 | int binary = 0; | |
240 | #ifdef USE_IODEBUG_HOOKS | |
241 | hook_data_int hdata; | |
242 | #endif | |
54ac8b60 | 243 | |
d91ce397 | 244 | while(1) |
54ac8b60 | 245 | { |
d91ce397 VY |
246 | if(IsAnyDead(client_p)) |
247 | return; | |
248 | ||
249 | /* | |
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. | |
252 | * -- adrian | |
253 | */ | |
254 | length = rb_read(client_p->localClient->F, readBuf, READBUF_SIZE); | |
255 | ||
9f316874 | 256 | if(length < 0) |
54ac8b60 | 257 | { |
9f316874 | 258 | if(rb_ignore_errno(errno)) |
55abcbb2 | 259 | rb_setselect(client_p->localClient->F, |
d91ce397 | 260 | RB_SELECT_READ, read_packet, client_p); |
9f316874 | 261 | else |
d91ce397 VY |
262 | error_exit_client(client_p, length); |
263 | return; | |
264 | } | |
9f316874 | 265 | else if(length == 0) |
d91ce397 VY |
266 | { |
267 | error_exit_client(client_p, length); | |
54ac8b60 VY |
268 | return; |
269 | } | |
54ac8b60 VY |
270 | |
271 | #ifdef USE_IODEBUG_HOOKS | |
d91ce397 VY |
272 | hdata.client = client_p; |
273 | hdata.arg1 = readBuf; | |
274 | hdata.arg2 = length; | |
275 | call_hook(h_iorecv_id, &hdata); | |
54ac8b60 VY |
276 | #endif |
277 | ||
d91ce397 VY |
278 | if(client_p->localClient->lasttime < rb_current_time()) |
279 | client_p->localClient->lasttime = rb_current_time(); | |
280 | client_p->flags &= ~FLAGS_PINGSENT; | |
54ac8b60 | 281 | |
d91ce397 VY |
282 | /* |
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 | |
285 | * turn comes around. | |
286 | */ | |
287 | if(IsHandshake(client_p) || IsUnknown(client_p)) | |
288 | binary = 1; | |
54ac8b60 | 289 | |
32fb5895 | 290 | (void) rb_linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary); |
54ac8b60 | 291 | |
d91ce397 VY |
292 | if(IsAnyDead(client_p)) |
293 | return; | |
55abcbb2 | 294 | |
d91ce397 VY |
295 | /* Attempt to parse what we have */ |
296 | parse_client_queued(client_p); | |
54ac8b60 | 297 | |
d91ce397 | 298 | if(IsAnyDead(client_p)) |
54ac8b60 | 299 | return; |
55abcbb2 | 300 | |
d91ce397 VY |
301 | /* Check to make sure we're not flooding */ |
302 | if(!IsAnyServer(client_p) && | |
e6e54763 | 303 | (rb_linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood_max_lines)) |
d91ce397 VY |
304 | { |
305 | if(!(ConfigFileEntry.no_oper_flood && IsOper(client_p))) | |
306 | { | |
307 | exit_client(client_p, client_p, client_p, "Excess Flood"); | |
308 | return; | |
309 | } | |
54ac8b60 | 310 | } |
54ac8b60 | 311 | |
d91ce397 VY |
312 | /* bail if short read */ |
313 | if(length < READBUF_SIZE) | |
314 | { | |
315 | rb_setselect(client_p->localClient->F, RB_SELECT_READ, read_packet, client_p); | |
316 | return; | |
317 | } | |
54ac8b60 VY |
318 | } |
319 | } | |
320 | ||
321 | /* | |
322 | * client_dopacket - copy packet to client buf and parse it | |
323 | * client_p - pointer to client structure for which the buffer data | |
324 | * applies. | |
325 | * buffer - pointr to the buffer containing the newly read data | |
326 | * length - number of valid bytes of data in the buffer | |
327 | * | |
328 | * Note: | |
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..) | |
332 | */ | |
333 | void | |
334 | client_dopacket(struct Client *client_p, char *buffer, size_t length) | |
335 | { | |
336 | s_assert(client_p != NULL); | |
337 | s_assert(buffer != NULL); | |
338 | ||
339 | if(client_p == NULL || buffer == NULL) | |
340 | return; | |
341 | if(IsAnyDead(client_p)) | |
342 | return; | |
55abcbb2 | 343 | /* |
54ac8b60 VY |
344 | * Update messages received |
345 | */ | |
346 | ++me.localClient->receiveM; | |
347 | ++client_p->localClient->receiveM; | |
348 | ||
55abcbb2 | 349 | /* |
54ac8b60 VY |
350 | * Update bytes received |
351 | */ | |
352 | client_p->localClient->receiveB += length; | |
353 | ||
354 | if(client_p->localClient->receiveB > 1023) | |
355 | { | |
356 | client_p->localClient->receiveK += (client_p->localClient->receiveB >> 10); | |
357 | client_p->localClient->receiveB &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */ | |
358 | } | |
359 | ||
360 | me.localClient->receiveB += length; | |
361 | ||
362 | if(me.localClient->receiveB > 1023) | |
363 | { | |
364 | me.localClient->receiveK += (me.localClient->receiveB >> 10); | |
365 | me.localClient->receiveB &= 0x03ff; | |
366 | } | |
367 | ||
368 | parse(client_p, buffer, buffer + length); | |
369 | } |