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212380e3 AC |
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 | * | |
54015b5f | 24 | * $Id: packet.c 3446 2007-05-14 22:21:16Z jilles $ |
212380e3 AC |
25 | */ |
26 | #include "stdinc.h" | |
27 | #include "tools.h" | |
28 | #include "commio.h" | |
29 | #include "s_conf.h" | |
30 | #include "s_serv.h" | |
31 | #include "client.h" | |
32 | #include "common.h" | |
33 | #include "ircd.h" | |
34 | #include "parse.h" | |
35 | #include "packet.h" | |
36 | #include "irc_string.h" | |
37 | #include "memory.h" | |
38 | #include "hook.h" | |
39 | #include "send.h" | |
40 | ||
41 | static char readBuf[READBUF_SIZE]; | |
42 | static void client_dopacket(struct Client *client_p, char *buffer, size_t length); | |
43 | ||
44 | ||
45 | /* | |
46 | * parse_client_queued - parse client queued messages | |
47 | */ | |
48 | static void | |
49 | parse_client_queued(struct Client *client_p) | |
50 | { | |
51 | int dolen = 0; | |
52 | int checkflood = 1; | |
53 | ||
54 | if(IsAnyDead(client_p)) | |
55 | return; | |
56 | ||
57 | if(IsUnknown(client_p)) | |
58 | { | |
212380e3 AC |
59 | for (;;) |
60 | { | |
54015b5f | 61 | if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read) |
212380e3 AC |
62 | break; |
63 | ||
64 | dolen = linebuf_get(&client_p->localClient-> | |
65 | buf_recvq, readBuf, READBUF_SIZE, | |
66 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
67 | ||
68 | if(dolen <= 0 || IsDead(client_p)) | |
69 | break; | |
70 | ||
71 | client_dopacket(client_p, readBuf, dolen); | |
54015b5f | 72 | client_p->localClient->sent_parsed++; |
212380e3 AC |
73 | |
74 | /* He's dead cap'n */ | |
75 | if(IsAnyDead(client_p)) | |
76 | return; | |
77 | /* if theyve dropped out of the unknown state, break and move | |
78 | * to the parsing for their appropriate status. --fl | |
79 | */ | |
80 | if(!IsUnknown(client_p)) | |
54015b5f JT |
81 | { |
82 | /* reset their flood limits, they're now | |
83 | * graced to flood | |
84 | */ | |
85 | client_p->localClient->sent_parsed = 0; | |
212380e3 | 86 | break; |
54015b5f | 87 | } |
212380e3 AC |
88 | |
89 | } | |
90 | } | |
91 | ||
92 | if(IsAnyServer(client_p) || IsExemptFlood(client_p)) | |
93 | { | |
94 | while (!IsAnyDead(client_p) && (dolen = linebuf_get(&client_p->localClient->buf_recvq, | |
95 | readBuf, READBUF_SIZE, LINEBUF_COMPLETE, | |
96 | LINEBUF_PARSED)) > 0) | |
97 | { | |
98 | client_dopacket(client_p, readBuf, dolen); | |
99 | } | |
100 | } | |
101 | else if(IsClient(client_p)) | |
102 | { | |
103 | ||
104 | if(IsOper(client_p) && ConfigFileEntry.no_oper_flood) | |
105 | checkflood = 0; | |
106 | /* | |
107 | * Handle flood protection here - if we exceed our flood limit on | |
108 | * messages in this loop, we simply drop out of the loop prematurely. | |
109 | * -- adrian | |
110 | */ | |
111 | for (;;) | |
112 | { | |
113 | /* This flood protection works as follows: | |
114 | * | |
115 | * A client is given allow_read lines to send to the server. Every | |
116 | * time a line is parsed, sent_parsed is increased. sent_parsed | |
117 | * is decreased by 1 every time flood_recalc is called. | |
118 | * | |
119 | * Thus a client can 'burst' allow_read lines to the server, any | |
120 | * excess lines will be parsed one per flood_recalc() call. | |
121 | * | |
122 | * Therefore a client will be penalised more if they keep flooding, | |
123 | * as sent_parsed will always hover around the allow_read limit | |
124 | * and no 'bursts' will be permitted. | |
125 | */ | |
126 | if(checkflood) | |
127 | { | |
128 | if(client_p->localClient->sent_parsed >= client_p->localClient->allow_read) | |
129 | break; | |
130 | } | |
131 | ||
132 | /* allow opers 4 times the amount of messages as users. why 4? | |
133 | * why not. :) --fl_ | |
134 | */ | |
135 | else if(client_p->localClient->sent_parsed >= (4 * client_p->localClient->allow_read)) | |
136 | break; | |
137 | ||
138 | dolen = linebuf_get(&client_p->localClient-> | |
139 | buf_recvq, readBuf, READBUF_SIZE, | |
140 | LINEBUF_COMPLETE, LINEBUF_PARSED); | |
141 | ||
142 | if(!dolen) | |
143 | break; | |
144 | ||
145 | client_dopacket(client_p, readBuf, dolen); | |
146 | if(IsAnyDead(client_p)) | |
147 | return; | |
148 | client_p->localClient->sent_parsed++; | |
149 | } | |
150 | } | |
151 | } | |
152 | ||
153 | /* flood_endgrace() | |
154 | * | |
155 | * marks the end of the clients grace period | |
156 | */ | |
157 | void | |
158 | flood_endgrace(struct Client *client_p) | |
159 | { | |
160 | SetFloodDone(client_p); | |
161 | ||
162 | /* Drop their flood limit back down */ | |
163 | client_p->localClient->allow_read = MAX_FLOOD; | |
164 | ||
165 | /* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST, | |
166 | * so reset it. | |
167 | */ | |
168 | client_p->localClient->sent_parsed = 0; | |
169 | } | |
170 | ||
171 | /* | |
172 | * flood_recalc | |
173 | * | |
174 | * recalculate the number of allowed flood lines. this should be called | |
175 | * once a second on any given client. We then attempt to flush some data. | |
176 | */ | |
177 | void | |
178 | flood_recalc(int fd, void *data) | |
179 | { | |
180 | struct Client *client_p = data; | |
181 | struct LocalUser *lclient_p = client_p->localClient; | |
182 | ||
183 | /* This can happen in the event that the client detached. */ | |
184 | if(!lclient_p) | |
185 | return; | |
186 | ||
187 | /* allow a bursting client their allocation per second, allow | |
188 | * a client whos flooding an extra 2 per second | |
189 | */ | |
190 | if(IsFloodDone(client_p)) | |
191 | lclient_p->sent_parsed -= 2; | |
192 | else | |
193 | lclient_p->sent_parsed = 0; | |
194 | ||
195 | if(lclient_p->sent_parsed < 0) | |
196 | lclient_p->sent_parsed = 0; | |
197 | ||
198 | if(--lclient_p->actually_read < 0) | |
199 | lclient_p->actually_read = 0; | |
200 | ||
201 | parse_client_queued(client_p); | |
202 | ||
203 | if(IsAnyDead(client_p)) | |
204 | return; | |
205 | ||
206 | /* and finally, reset the flood check */ | |
207 | comm_setflush(fd, 1000, flood_recalc, client_p); | |
208 | } | |
209 | ||
210 | /* | |
211 | * read_ctrl_packet - Read a 'packet' of data from a servlink control | |
212 | * link and process it. | |
213 | */ | |
214 | void | |
215 | read_ctrl_packet(int fd, void *data) | |
216 | { | |
217 | struct Client *server = data; | |
218 | struct LocalUser *lserver = server->localClient; | |
219 | struct SlinkRpl *reply; | |
220 | int length = 0; | |
221 | unsigned char tmp[2]; | |
222 | unsigned char *len = tmp; | |
223 | struct SlinkRplDef *replydef; | |
224 | #ifdef USE_IODEBUG_HOOKS | |
225 | hook_data_int hdata; | |
226 | #endif | |
227 | ||
228 | s_assert(lserver != NULL); | |
229 | if(IsAnyDead(server)) | |
230 | return; | |
231 | ||
232 | reply = &lserver->slinkrpl; | |
233 | ||
234 | ||
235 | if(!reply->command) | |
236 | { | |
237 | reply->gotdatalen = 0; | |
238 | reply->readdata = 0; | |
239 | reply->data = NULL; | |
240 | ||
241 | length = read(fd, tmp, 1); | |
242 | ||
243 | if(length <= 0) | |
244 | { | |
245 | if((length == -1) && ignoreErrno(errno)) | |
246 | goto nodata; | |
247 | error_exit_client(server, length); | |
248 | return; | |
249 | } | |
250 | ||
251 | reply->command = tmp[0]; | |
252 | } | |
253 | ||
254 | for (replydef = slinkrpltab; replydef->handler; replydef++) | |
255 | { | |
256 | if((int)replydef->replyid == reply->command) | |
257 | break; | |
258 | } | |
259 | ||
260 | /* we should be able to trust a local slink process... | |
261 | * and if it sends an invalid command, that's a bug.. */ | |
262 | s_assert(replydef->handler); | |
263 | ||
264 | if((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2)) | |
265 | { | |
266 | /* we need a datalen u16 which we don't have yet... */ | |
267 | length = read(fd, len, (2 - reply->gotdatalen)); | |
268 | if(length <= 0) | |
269 | { | |
270 | if((length == -1) && ignoreErrno(errno)) | |
271 | goto nodata; | |
272 | error_exit_client(server, length); | |
273 | return; | |
274 | } | |
275 | ||
276 | if(reply->gotdatalen == 0) | |
277 | { | |
278 | reply->datalen = *len << 8; | |
279 | reply->gotdatalen++; | |
280 | length--; | |
281 | len++; | |
282 | } | |
283 | if(length && (reply->gotdatalen == 1)) | |
284 | { | |
285 | reply->datalen |= *len; | |
286 | reply->gotdatalen++; | |
287 | if(reply->datalen > 0) | |
288 | reply->data = MyMalloc(reply->datalen); | |
289 | } | |
290 | ||
291 | if(reply->gotdatalen < 2) | |
292 | return; /* wait for more data */ | |
293 | } | |
294 | ||
295 | if(reply->readdata < reply->datalen) /* try to get any remaining data */ | |
296 | { | |
297 | length = read(fd, (reply->data + reply->readdata), | |
298 | (reply->datalen - reply->readdata)); | |
299 | if(length <= 0) | |
300 | { | |
301 | if((length == -1) && ignoreErrno(errno)) | |
302 | goto nodata; | |
303 | error_exit_client(server, length); | |
304 | return; | |
305 | } | |
306 | ||
307 | reply->readdata += length; | |
308 | if(reply->readdata < reply->datalen) | |
309 | return; /* wait for more data */ | |
310 | } | |
311 | ||
312 | #ifdef USE_IODEBUG_HOOKS | |
313 | hdata.client = server; | |
314 | hdata.arg1 = NULL; | |
315 | hdata.arg2 = reply->command; | |
316 | hdata.data = NULL; | |
317 | call_hook(h_iorecvctrl_id, &hdata); | |
318 | #endif | |
319 | ||
320 | /* we now have the command and any data, pass it off to the handler */ | |
321 | (*replydef->handler) (reply->command, reply->datalen, reply->data, server); | |
322 | ||
323 | /* reset SlinkRpl */ | |
324 | if(reply->datalen > 0) | |
325 | MyFree(reply->data); | |
326 | reply->command = 0; | |
327 | ||
328 | if(IsAnyDead(server)) | |
329 | return; | |
330 | ||
331 | nodata: | |
332 | /* If we get here, we need to register for another COMM_SELECT_READ */ | |
333 | comm_setselect(fd, FDLIST_SERVER, COMM_SELECT_READ, read_ctrl_packet, server, 0); | |
334 | } | |
335 | ||
336 | /* | |
337 | * read_packet - Read a 'packet' of data from a connection and process it. | |
338 | */ | |
339 | void | |
340 | read_packet(int fd, void *data) | |
341 | { | |
342 | struct Client *client_p = data; | |
343 | struct LocalUser *lclient_p = client_p->localClient; | |
344 | int length = 0; | |
345 | int lbuf_len; | |
346 | ||
347 | int binary = 0; | |
348 | #ifdef USE_IODEBUG_HOOKS | |
349 | hook_data_int hdata; | |
350 | #endif | |
351 | if(IsAnyDead(client_p)) | |
352 | return; | |
353 | ||
354 | /* | |
355 | * Read some data. We *used to* do anti-flood protection here, but | |
356 | * I personally think it makes the code too hairy to make sane. | |
357 | * -- adrian | |
358 | */ | |
359 | length = read(client_p->localClient->fd, readBuf, READBUF_SIZE); | |
360 | ||
361 | if(length <= 0) | |
362 | { | |
363 | if((length == -1) && ignoreErrno(errno)) | |
364 | { | |
365 | comm_setselect(client_p->localClient->fd, FDLIST_IDLECLIENT, | |
366 | COMM_SELECT_READ, read_packet, client_p, 0); | |
367 | return; | |
368 | } | |
369 | error_exit_client(client_p, length); | |
370 | return; | |
371 | } | |
372 | ||
373 | #ifdef USE_IODEBUG_HOOKS | |
374 | hdata.client = client_p; | |
375 | hdata.arg1 = readBuf; | |
376 | hdata.arg2 = length; | |
377 | call_hook(h_iorecv_id, &hdata); | |
378 | #endif | |
379 | ||
380 | if(client_p->localClient->lasttime < CurrentTime) | |
381 | client_p->localClient->lasttime = CurrentTime; | |
382 | client_p->flags &= ~FLAGS_PINGSENT; | |
383 | ||
384 | /* | |
385 | * Before we even think of parsing what we just read, stick | |
386 | * it on the end of the receive queue and do it when its | |
387 | * turn comes around. | |
388 | */ | |
389 | if(IsHandshake(client_p) || IsUnknown(client_p)) | |
390 | binary = 1; | |
391 | ||
392 | lbuf_len = linebuf_parse(&client_p->localClient->buf_recvq, readBuf, length, binary); | |
393 | ||
394 | lclient_p->actually_read += lbuf_len; | |
395 | ||
396 | if(IsAnyDead(client_p)) | |
397 | return; | |
398 | ||
399 | /* Attempt to parse what we have */ | |
400 | parse_client_queued(client_p); | |
401 | ||
402 | if(IsAnyDead(client_p)) | |
403 | return; | |
404 | ||
405 | /* Check to make sure we're not flooding */ | |
406 | if(!IsAnyServer(client_p) && | |
407 | (linebuf_alloclen(&client_p->localClient->buf_recvq) > ConfigFileEntry.client_flood)) | |
408 | { | |
409 | if(!(ConfigFileEntry.no_oper_flood && IsOper(client_p))) | |
410 | { | |
411 | exit_client(client_p, client_p, client_p, "Excess Flood"); | |
412 | return; | |
413 | } | |
414 | } | |
415 | ||
416 | /* If we get here, we need to register for another COMM_SELECT_READ */ | |
417 | if(PARSE_AS_SERVER(client_p)) | |
418 | { | |
419 | comm_setselect(client_p->localClient->fd, FDLIST_SERVER, COMM_SELECT_READ, | |
420 | read_packet, client_p, 0); | |
421 | } | |
422 | else | |
423 | { | |
424 | comm_setselect(client_p->localClient->fd, FDLIST_IDLECLIENT, | |
425 | COMM_SELECT_READ, read_packet, client_p, 0); | |
426 | } | |
427 | } | |
428 | ||
429 | /* | |
430 | * client_dopacket - copy packet to client buf and parse it | |
431 | * client_p - pointer to client structure for which the buffer data | |
432 | * applies. | |
433 | * buffer - pointr to the buffer containing the newly read data | |
434 | * length - number of valid bytes of data in the buffer | |
435 | * | |
436 | * Note: | |
437 | * It is implicitly assumed that dopacket is called only | |
438 | * with client_p of "local" variation, which contains all the | |
439 | * necessary fields (buffer etc..) | |
440 | */ | |
441 | void | |
442 | client_dopacket(struct Client *client_p, char *buffer, size_t length) | |
443 | { | |
444 | s_assert(client_p != NULL); | |
445 | s_assert(buffer != NULL); | |
446 | ||
447 | if(client_p == NULL || buffer == NULL) | |
448 | return; | |
449 | if(IsAnyDead(client_p)) | |
450 | return; | |
451 | /* | |
452 | * Update messages received | |
453 | */ | |
454 | ++me.localClient->receiveM; | |
455 | ++client_p->localClient->receiveM; | |
456 | ||
457 | /* | |
458 | * Update bytes received | |
459 | */ | |
460 | client_p->localClient->receiveB += length; | |
461 | ||
462 | if(client_p->localClient->receiveB > 1023) | |
463 | { | |
464 | client_p->localClient->receiveK += (client_p->localClient->receiveB >> 10); | |
465 | client_p->localClient->receiveB &= 0x03ff; /* 2^10 = 1024, 3ff = 1023 */ | |
466 | } | |
467 | ||
468 | me.localClient->receiveB += length; | |
469 | ||
470 | if(me.localClient->receiveB > 1023) | |
471 | { | |
472 | me.localClient->receiveK += (me.localClient->receiveB >> 10); | |
473 | me.localClient->receiveB &= 0x03ff; | |
474 | } | |
475 | ||
476 | parse(client_p, buffer, buffer + length); | |
477 | } |