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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 | #include "stdinc.h" | |
25 | #include "s_conf.h" | |
26 | #include "s_serv.h" | |
27 | #include "client.h" | |
28 | #include "ircd.h" | |
29 | #include "parse.h" | |
30 | #include "packet.h" | |
31 | #include "match.h" | |
32 | #include "hook.h" | |
33 | #include "send.h" | |
34 | #include "s_assert.h" | |
35 | #include "s_newconf.h" | |
36 | ||
37 | static char readBuf[READBUF_SIZE]; | |
38 | static void client_dopacket(struct Client *client_p, char *buffer, size_t length); | |
39 | ||
40 | /* | |
41 | * parse_client_queued - parse client queued messages | |
42 | */ | |
43 | static void | |
44 | parse_client_queued(struct Client *client_p) | |
45 | { | |
46 | int dolen = 0; | |
47 | int allow_read; | |
48 | ||
49 | if(IsAnyDead(client_p)) | |
50 | return; | |
51 | ||
52 | if(IsUnknown(client_p)) | |
53 | { | |
54 | allow_read = ConfigFileEntry.client_flood_burst_max; | |
55 | for (;;) | |
56 | { | |
57 | if(client_p->localClient->sent_parsed >= allow_read) | |
58 | break; | |
59 | ||
60 | dolen = rb_linebuf_get(&client_p->localClient-> | |
61 | buf_recvq, readBuf, READBUF_SIZE, | |
62 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
63 | ||
64 | if(dolen <= 0 || IsDead(client_p)) | |
65 | break; | |
66 | ||
67 | client_dopacket(client_p, readBuf, dolen); | |
68 | client_p->localClient->sent_parsed++; | |
69 | ||
70 | /* He's dead cap'n */ | |
71 | if(IsAnyDead(client_p)) | |
72 | return; | |
73 | /* if theyve dropped out of the unknown state, break and move | |
74 | * to the parsing for their appropriate status. --fl | |
75 | */ | |
76 | if(!IsUnknown(client_p)) | |
77 | { | |
78 | /* reset their flood limits, they're now | |
79 | * graced to flood | |
80 | */ | |
81 | client_p->localClient->sent_parsed = 0; | |
82 | break; | |
83 | } | |
84 | ||
85 | } | |
86 | /* If sent_parsed is impossibly high, drop it down. | |
87 | * This is useful if the configuration is changed. | |
88 | */ | |
89 | if(client_p->localClient->sent_parsed > allow_read) | |
90 | client_p->localClient->sent_parsed = allow_read; | |
91 | } | |
92 | ||
93 | if(IsAnyServer(client_p) || IsExemptFlood(client_p)) | |
94 | { | |
95 | while (!IsAnyDead(client_p) && (dolen = rb_linebuf_get(&client_p->localClient->buf_recvq, | |
96 | readBuf, READBUF_SIZE, LINEBUF_COMPLETE, | |
97 | LINEBUF_PARSED)) > 0) | |
98 | { | |
99 | client_dopacket(client_p, readBuf, dolen); | |
100 | } | |
101 | } | |
102 | else if(IsClient(client_p)) | |
103 | { | |
104 | if(IsFloodDone(client_p)) | |
105 | allow_read = ConfigFileEntry.client_flood_burst_max; | |
106 | else | |
107 | allow_read = ConfigFileEntry.client_flood_burst_rate; | |
108 | allow_read *= ConfigFileEntry.client_flood_message_time; | |
109 | /* allow opers 4 times the amount of messages as users. why 4? | |
110 | * why not. :) --fl_ | |
111 | */ | |
112 | if(IsOperGeneral(client_p) && ConfigFileEntry.no_oper_flood) | |
113 | allow_read *= 4; | |
114 | /* | |
115 | * Handle flood protection here - if we exceed our flood limit on | |
116 | * messages in this loop, we simply drop out of the loop prematurely. | |
117 | * -- adrian | |
118 | */ | |
119 | for (;;) | |
120 | { | |
121 | /* This flood protection works as follows: | |
122 | * | |
123 | * A client is given allow_read lines to send to the server. Every | |
124 | * time a line is parsed, sent_parsed is increased. sent_parsed | |
125 | * is decreased by 1 every time flood_recalc is called. | |
126 | * | |
127 | * Thus a client can 'burst' allow_read lines to the server, any | |
128 | * excess lines will be parsed one per flood_recalc() call. | |
129 | * | |
130 | * Therefore a client will be penalised more if they keep flooding, | |
131 | * as sent_parsed will always hover around the allow_read limit | |
132 | * and no 'bursts' will be permitted. | |
133 | */ | |
134 | if(client_p->localClient->sent_parsed >= allow_read) | |
135 | break; | |
136 | ||
137 | /* post_registration_delay hack. Don't process any messages from a new client for $n seconds, | |
138 | * to allow network bots to do their thing before channels can be joined. | |
139 | */ | |
140 | if (rb_current_time() < client_p->localClient->firsttime + ConfigFileEntry.post_registration_delay) | |
141 | break; | |
142 | ||
143 | dolen = rb_linebuf_get(&client_p->localClient-> | |
144 | buf_recvq, readBuf, READBUF_SIZE, | |
145 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
146 | ||
147 | if(!dolen) | |
148 | break; | |
149 | ||
150 | client_dopacket(client_p, readBuf, dolen); | |
151 | if(IsAnyDead(client_p)) | |
152 | return; | |
153 | ||
154 | client_p->localClient->sent_parsed += ConfigFileEntry.client_flood_message_time; | |
155 | } | |
156 | /* If sent_parsed is impossibly high, drop it down. | |
157 | * This is useful if the configuration is changed. | |
158 | */ | |
159 | if(client_p->localClient->sent_parsed > allow_read + | |
160 | ConfigFileEntry.client_flood_message_time - 1) | |
161 | client_p->localClient->sent_parsed = allow_read + | |
162 | ConfigFileEntry.client_flood_message_time - 1; | |
163 | } | |
164 | } | |
165 | ||
166 | /* flood_endgrace() | |
167 | * | |
168 | * marks the end of the clients grace period | |
169 | */ | |
170 | void | |
171 | flood_endgrace(struct Client *client_p) | |
172 | { | |
173 | SetFloodDone(client_p); | |
174 | ||
175 | /* sent_parsed could be way over client_flood_burst_max but under | |
176 | * client_flood_burst_rate so reset it. | |
177 | */ | |
178 | client_p->localClient->sent_parsed = 0; | |
179 | } | |
180 | ||
181 | /* | |
182 | * flood_recalc | |
183 | * | |
184 | * recalculate the number of allowed flood lines. this should be called | |
185 | * once a second on any given client. We then attempt to flush some data. | |
186 | */ | |
187 | void | |
188 | flood_recalc(void *unused) | |
189 | { | |
190 | rb_dlink_node *ptr, *next; | |
191 | struct Client *client_p; | |
192 | ||
193 | RB_DLINK_FOREACH_SAFE(ptr, next, lclient_list.head) | |
194 | { | |
195 | client_p = ptr->data; | |
196 | ||
197 | if(rb_unlikely(IsMe(client_p))) | |
198 | continue; | |
199 | ||
200 | if(rb_unlikely(client_p->localClient == NULL)) | |
201 | continue; | |
202 | ||
203 | if(IsFloodDone(client_p)) | |
204 | client_p->localClient->sent_parsed -= ConfigFileEntry.client_flood_message_num; | |
205 | else | |
206 | client_p->localClient->sent_parsed = 0; | |
207 | ||
208 | if(client_p->localClient->sent_parsed < 0) | |
209 | client_p->localClient->sent_parsed = 0; | |
210 | ||
211 | parse_client_queued(client_p); | |
212 | ||
213 | if(rb_unlikely(IsAnyDead(client_p))) | |
214 | continue; | |
215 | ||
216 | } | |
217 | ||
218 | RB_DLINK_FOREACH_SAFE(ptr, next, unknown_list.head) | |
219 | { | |
220 | client_p = ptr->data; | |
221 | ||
222 | if(client_p->localClient == NULL) | |
223 | continue; | |
224 | ||
225 | client_p->localClient->sent_parsed--; | |
226 | ||
227 | if(client_p->localClient->sent_parsed < 0) | |
228 | client_p->localClient->sent_parsed = 0; | |
229 | ||
230 | parse_client_queued(client_p); | |
231 | } | |
232 | } | |
233 | ||
234 | /* | |
235 | * read_packet - Read a 'packet' of data from a connection and process it. | |
236 | */ | |
237 | void | |
238 | read_packet(rb_fde_t * F, void *data) | |
239 | { | |
240 | struct Client *client_p = data; | |
241 | int length = 0; | |
242 | int binary = 0; | |
243 | ||
244 | while(1) | |
245 | { | |
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 | ||
256 | if(length < 0) | |
257 | { | |
258 | if(rb_ignore_errno(errno)) | |
259 | rb_setselect(client_p->localClient->F, | |
260 | RB_SELECT_READ, read_packet, client_p); | |
261 | else | |
262 | error_exit_client(client_p, length); | |
263 | return; | |
264 | } | |
265 | else if(length == 0) | |
266 | { | |
267 | error_exit_client(client_p, length); | |
268 | return; | |
269 | } | |
270 | ||
271 | if(client_p->localClient->lasttime < rb_current_time()) | |
272 | client_p->localClient->lasttime = rb_current_time(); | |
273 | client_p->flags &= ~FLAGS_PINGSENT; | |
274 | ||
275 | if (client_p->flags & FLAGS_PINGWARN) | |
276 | { | |
277 | /* | |
278 | * if we warned about this server being unresponsive | |
279 | * before, let's let everyone know there's no need | |
280 | * to panic | |
281 | */ | |
282 | client_p->flags &= ~FLAGS_PINGWARN; | |
283 | sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, | |
284 | "Received response from previously unresponsive link %s", | |
285 | client_p->name); | |
286 | ilog(L_SERVER, | |
287 | "Received response from previously unresponsive link %s", | |
288 | log_client_name(client_p, HIDE_IP)); | |
289 | } | |
290 | ||
291 | ||
292 | /* | |
293 | * Before we even think of parsing what we just read, stick | |
294 | * it on the end of the receive queue and do it when its | |
295 | * turn comes around. | |
296 | */ | |
297 | if(IsHandshake(client_p) || IsUnknown(client_p)) | |
298 | binary = 1; | |
299 | ||
300 | (void) rb_linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary); | |
301 | ||
302 | if(IsAnyDead(client_p)) | |
303 | return; | |
304 | ||
305 | /* Attempt to parse what we have */ | |
306 | parse_client_queued(client_p); | |
307 | ||
308 | if(IsAnyDead(client_p)) | |
309 | return; | |
310 | ||
311 | /* Check to make sure we're not flooding */ | |
312 | if(!IsAnyServer(client_p) && | |
313 | (rb_linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood_max_lines)) | |
314 | { | |
315 | if(!(ConfigFileEntry.no_oper_flood && IsOperGeneral(client_p))) | |
316 | { | |
317 | exit_client(client_p, client_p, client_p, "Excess Flood"); | |
318 | return; | |
319 | } | |
320 | } | |
321 | ||
322 | /* bail if short read, but not for SCTP as it returns data in packets */ | |
323 | if (length < READBUF_SIZE && !(rb_get_type(client_p->localClient->F) & RB_FD_SCTP)) { | |
324 | rb_setselect(client_p->localClient->F, RB_SELECT_READ, read_packet, client_p); | |
325 | return; | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
330 | /* | |
331 | * client_dopacket - copy packet to client buf and parse it | |
332 | * client_p - pointer to client structure for which the buffer data | |
333 | * applies. | |
334 | * buffer - pointr to the buffer containing the newly read data | |
335 | * length - number of valid bytes of data in the buffer | |
336 | * | |
337 | * Note: | |
338 | * It is implicitly assumed that dopacket is called only | |
339 | * with client_p of "local" variation, which contains all the | |
340 | * necessary fields (buffer etc..) | |
341 | */ | |
342 | static void | |
343 | client_dopacket(struct Client *client_p, char *buffer, size_t length) | |
344 | { | |
345 | s_assert(client_p != NULL); | |
346 | s_assert(buffer != NULL); | |
347 | ||
348 | if(client_p == NULL || buffer == NULL) | |
349 | return; | |
350 | if(IsAnyDead(client_p)) | |
351 | return; | |
352 | /* | |
353 | * Update messages received | |
354 | */ | |
355 | ++me.localClient->receiveM; | |
356 | ++client_p->localClient->receiveM; | |
357 | ||
358 | /* | |
359 | * Update bytes received | |
360 | */ | |
361 | client_p->localClient->receiveB += length; | |
362 | ||
363 | if(client_p->localClient->receiveB > 1023) | |
364 | { | |
365 | client_p->localClient->receiveK += (client_p->localClient->receiveB >> 10); | |
366 | client_p->localClient->receiveB &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */ | |
367 | } | |
368 | ||
369 | me.localClient->receiveB += length; | |
370 | ||
371 | if(me.localClient->receiveB > 1023) | |
372 | { | |
373 | me.localClient->receiveK += (me.localClient->receiveB >> 10); | |
374 | me.localClient->receiveB &= 0x03ff; | |
375 | } | |
376 | ||
377 | parse(client_p, buffer, buffer + length); | |
378 | } |