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root/svn/ircd-hybrid/trunk/src/packet.c

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ircd-hybrid-7.2/src/packet.c (file contents), Revision 34 by lusky, Sun Oct 2 21:05:51 2005 UTC vs.
ircd-hybrid/trunk/src/packet.c (file contents), Revision 6517 by michael, Mon Sep 7 17:16:45 2015 UTC

#	Line 1 | Line 1
1		/*
2	<	*  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	<	*  packet.c: Packet handlers.
2	>	*  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3		*
4	<	*  Copyright (C) 2002 by the past and present ircd coders, and others.
4	>	*  Copyright (c) 1997-2015 ircd-hybrid development team
5		*
6		*  This program is free software; you can redistribute it and/or modify
7		*  it under the terms of the GNU General Public License as published by
#	Line 16 | Line 15
15		*
16		*  You should have received a copy of the GNU General Public License
17		*  along with this program; if not, write to the Free Software
18	<	*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
18	>	*  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19		*  USA
21	–	*
22	–	*  $Id$
20		*/
21	+
22	+	/*! \file packet.c
23	+	* \brief Packet handlers.
24	+	* \version $Id$
25	+	*/
26	+
27		#include "stdinc.h"
28	<	#include "tools.h"
28	>	#include "list.h"
29		#include "s_bsd.h"
30	<	#include "s_conf.h"
31	<	#include "s_serv.h"
30	>	#include "conf.h"
31	>	#include "server.h"
32		#include "client.h"
30	–	#include "common.h"
33		#include "ircd.h"
32	–	#include "list.h"
34		#include "parse.h"
35		#include "fdlist.h"
36		#include "packet.h"
37		#include "irc_string.h"
38		#include "memory.h"
38	–	#include "hook.h"
39		#include "send.h"
40	<	#include "irc_getnameinfo.h"
41	<
42	<	#define READBUF_SIZE 16384
40	>	#include "misc.h"
41
42	<	struct Callback *iorecv_cb = NULL;
45	<	struct Callback *iorecvctrl_cb = NULL;
42	>	enum { READBUF_SIZE = 16384 };
43
44		static char readBuf[READBUF_SIZE];
45	<	static void client_dopacket(struct Client *, char *, size_t);
45	>
46	>
47	>	/*
48	>	* client_dopacket - copy packet to client buf and parse it
49	>	*      client_p - pointer to client structure for which the buffer data
50	>	*             applies.
51	>	*      buffer - pointer to the buffer containing the newly read data
52	>	*      length - number of valid bytes of data in the buffer
53	>	*
54	>	* Note:
55	>	*      It is implicitly assumed that client_dopacket() is called only
56	>	*      with client_p of "local" variation, which contains all the
57	>	*      necessary fields (buffer etc..)
58	>	*/
59	>	static void
60	>	client_dopacket(struct Client *client_p, char *buffer, unsigned int length)
61	>	{
62	>	/* Update messages received */
63	>	++me.connection->recv.messages;
64	>	++client_p->connection->recv.messages;
65	>
66	>	/* Update bytes received */
67	>	client_p->connection->recv.bytes += length;
68	>	me.connection->recv.bytes += length;
69	>
70	>	parse(client_p, buffer, buffer + length);
71	>	}
72
73		/* extract_one_line()
74		*
#	Line 54 | Line 77 | static void client_dopacket(struct Clien
77		* output       - length of <buffer>
78		* side effects - one line is copied and removed from the dbuf
79		*/
80	<	static int
80	>	static unsigned int
81		extract_one_line(struct dbuf_queue *qptr, char *buffer)
82		{
83	<	struct dbuf_block *block;
84	<	int line_bytes = 0, empty_bytes = 0, phase = 0;
62	<	unsigned int idx;
63	<
64	<	char c;
65	<	dlink_node *ptr;
83	>	unsigned int line_bytes = 0, eol_bytes = 0;
84	>	dlink_node *node;
85
86	<	/*
68	<	* Phase 0: "empty" characters before the line
69	<	* Phase 1: copying the line
70	<	* Phase 2: "empty" characters after the line
71	<	*          (delete them as well and free some space in the dbuf)
72	<	*
73	<	* Empty characters are CR, LF and space (but, of course, not
74	<	* in the middle of a line). We try to remove as much of them as we can,
75	<	* since they simply eat server memory.
76	<	*
77	<	* --adx
78	<	*/
79	<	DLINK_FOREACH(ptr, qptr->blocks.head)
86	>	DLINK_FOREACH(node, qptr->blocks.head)
87		{
88	<	block = ptr->data;
88	>	const struct dbuf_block *block = node->data;
89	>	unsigned int idx;
90
91	<	for (idx = 0; idx < block->size; idx++)
91	>	if (node == qptr->blocks.head)
92	>	idx = qptr->pos;
93	>	else
94	>	idx = 0;
95	>
96	>	for (; idx < block->size; ++idx)
97		{
98	<	c = block->data[idx];
99	<	if (IsEol(c) || (c == ' ' && phase != 1))
100	<	{
88	<	empty_bytes++;
89	<	if (phase == 1)
90	<	phase = 2;
91	<	}
92	<	else switch (phase)
98	>	char c = block->data[idx];
99	>
100	>	if (IsEol(c))
101		{
102	<	case 0: phase = 1;
103	<	case 1: if (line_bytes++ < IRCD_BUFSIZE - 2)
104	<	*buffer++ = c;
105	<	break;
106	<	case 2: *buffer = '\0';
99	<	dbuf_delete(qptr, line_bytes + empty_bytes);
100	<	return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
102	>	++eol_bytes;
103	>
104	>	/* Allow 2 eol bytes per message */
105	>	if (eol_bytes == 2)
106	>	goto out;
107		}
108	+	else if (eol_bytes)
109	+	goto out;
110	+	else if (line_bytes++ < IRCD_BUFSIZE - 2)
111	+	*buffer++ = c;
112		}
113		}
114
115	+	out:
116	+
117		/*
118	<	* Now, if we haven't reached phase 2, ignore all line bytes
118	>	* Now, if we haven't found an EOL, ignore all line bytes
119		* that we have read, since this is a partial line case.
120		*/
121	<	if (phase != 2)
110	<	line_bytes = 0;
111	<	else
121	>	if (eol_bytes)
122		*buffer = '\0';
123	+	else
124	+	line_bytes = 0;
125
126		/* Remove what is now unnecessary */
127	<	dbuf_delete(qptr, line_bytes + empty_bytes);
127	>	dbuf_delete(qptr, line_bytes + eol_bytes);
128	>
129		return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
130		}
131
#	Line 121 | Line 134 | extract_one_line(struct dbuf_queue *qptr
134		*/
135		static void
136		parse_client_queued(struct Client *client_p)
137	<	{
138	<	int dolen = 0;
126	<	int checkflood = 1;
127	<	struct LocalUser *lclient_p = client_p->localClient;
137	>	{
138	>	unsigned int dolen = 0;
139
140		if (IsUnknown(client_p))
141		{
142	<	int i = 0;
142	>	unsigned int i = 0;
143
144	<	for(;;)
144	>	while (1)
145		{
146		if (IsDefunct(client_p))
147	<	return;
147	>	return;
148
149	<	/* rate unknown clients at MAX_FLOOD per loop */
149	>	/* Rate unknown clients at MAX_FLOOD per loop */
150		if (i >= MAX_FLOOD)
151		break;
152
153	<	dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
153	>	dolen = extract_one_line(&client_p->connection->buf_recvq, readBuf);
154	>
155		if (dolen == 0)
156	<	break;
156	>	break;
157
158		client_dopacket(client_p, readBuf, dolen);
159	<	i++;
159	>	++i;
160
161	<	/* if they've dropped out of the unknown state, break and move
161	>	/*
162	>	* If they've dropped out of the unknown state, break and move
163		* to the parsing for their appropriate status.  --fl
164		*/
165	<	if(!IsUnknown(client_p))
165	>	if (!IsUnknown(client_p))
166		break;
167		}
168		}
#	Line 160 | Line 173 | parse_client_queued(struct Client *clien
173		{
174		if (IsDefunct(client_p))
175		return;
176	<	if ((dolen = extract_one_line(&lclient_p->buf_recvq,
177	<	readBuf)) == 0)
176	>
177	>	if ((dolen = extract_one_line(&client_p->connection->buf_recvq, readBuf)) == 0)
178		break;
179	+
180		client_dopacket(client_p, readBuf, dolen);
181		}
182		}
183	<	else if(IsClient(client_p))
183	>	else if (IsClient(client_p))
184		{
185	<	if (ConfigFileEntry.no_oper_flood && (IsOper(client_p) || IsCanFlood(client_p)))
186	<	{
187	<	if (ConfigFileEntry.true_no_oper_flood)
188	<	checkflood = -1;
189	<	else
190	<	checkflood = 0;
177	<	}
185	>	unsigned int checkflood = 1;
186	>
187	>	if (ConfigGeneral.no_oper_flood && HasUMode(client_p, UMODE_OPER))
188	>	checkflood = 0;
189	>	else if (HasFlag(client_p, FLAGS_CANFLOOD))
190	>	checkflood = 0;
191
192		/*
193	<	* Handle flood protection here - if we exceed our flood limit on
194	<	* messages in this loop, we simply drop out of the loop prematurely.
193	>	* Handle flood protection here - if we exceed our flood limit on messages
194	>	* in this loop, we simply drop out of the loop prematurely.
195		*   -- adrian
196		*/
197	<	for (;;)
197	>	while (1)
198		{
199		if (IsDefunct(client_p))
200	<	break;
200	>	break;
201
202	<	/* This flood protection works as follows:
202	>	/*
203	>	* This flood protection works as follows:
204		*
205		* A client is given allow_read lines to send to the server.  Every
206		* time a line is parsed, sent_parsed is increased.  sent_parsed
#	Line 199 | Line 213 | parse_client_queued(struct Client *clien
213		* as sent_parsed will always hover around the allow_read limit
214		* and no 'bursts' will be permitted.
215		*/
216	<	if (checkflood > 0)
217	<	{
204	<	if(lclient_p->sent_parsed >= lclient_p->allow_read)
216	>	if (checkflood)
217	>	if (client_p->connection->sent_parsed >= client_p->connection->allow_read)
218		break;
206	–	}
207	–
208	–	/* allow opers 4 times the amount of messages as users. why 4?
209	–	* why not. :) --fl_
210	–	*/
211	–	else if (lclient_p->sent_parsed >= (4 * lclient_p->allow_read) &&
212	–	checkflood != -1)
213	–	break;
219
220	<	dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
220	>	dolen = extract_one_line(&client_p->connection->buf_recvq, readBuf);
221	>
222		if (dolen == 0)
223		break;
224
225		client_dopacket(client_p, readBuf, dolen);
226	<	lclient_p->sent_parsed++;
226	>	++client_p->connection->sent_parsed;
227		}
228		}
229		}
#	Line 229 | Line 235 | parse_client_queued(struct Client *clien
235		void
236		flood_endgrace(struct Client *client_p)
237		{
238	<	SetFloodDone(client_p);
238	>	AddFlag(client_p, FLAGS_FLOODDONE);
239
240		/* Drop their flood limit back down */
241	<	client_p->localClient->allow_read = MAX_FLOOD;
241	>	client_p->connection->allow_read = MAX_FLOOD;
242
243	<	/* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
243	>	/*
244	>	* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
245		* so reset it.
246		*/
247	<	client_p->localClient->sent_parsed = 0;
247	>	client_p->connection->sent_parsed = 0;
248		}
249
250		/*
#	Line 249 | Line 256 | flood_endgrace(struct Client *client_p)
256		void
257		flood_recalc(fde_t *fd, void *data)
258		{
259	<	struct Client *client_p = data;
260	<	struct LocalUser *lclient_p = client_p->localClient;
261	<
262	<	/* allow a bursting client their allocation per second, allow
259	>	struct Client *const client_p = data;
260	>
261	>	/*
262	>	* Allow a bursting client their allocation per second, allow
263		* a client whos flooding an extra 2 per second
264		*/
265		if (IsFloodDone(client_p))
266	<	lclient_p->sent_parsed -= 2;
266	>	client_p->connection->sent_parsed -= 2;
267		else
268	<	lclient_p->sent_parsed = 0;
269	<
270	<	if (lclient_p->sent_parsed < 0)
271	<	lclient_p->sent_parsed = 0;
272	<
268	>	client_p->connection->sent_parsed = 0;
269	>
270	>	if (client_p->connection->sent_parsed < 0)
271	>	client_p->connection->sent_parsed = 0;
272	>
273		parse_client_queued(client_p);
274	<
274	>
275		/* And now, try flushing .. */
276		if (!IsDead(client_p))
277		{
#	Line 274 | Line 281 | flood_recalc(fde_t *fd, void *data)
281		}
282
283		/*
277	–	* read_ctrl_packet - Read a 'packet' of data from a servlink control
278	–	*                    link and process it.
279	–	*/
280	–	void
281	–	read_ctrl_packet(fde_t *fd, void *data)
282	–	{
283	–	struct Client *server = data;
284	–	struct LocalUser *lserver = server->localClient;
285	–	struct SlinkRpl *reply;
286	–	int length = 0;
287	–	unsigned char tmp[2];
288	–	unsigned char *len = tmp;
289	–	struct SlinkRplDef *replydef;
290	–
291	–	assert(lserver != NULL);
292	–
293	–	reply = &lserver->slinkrpl;
294	–
295	–	if (IsDefunct(server))
296	–	return;
297	–
298	–	if (!reply->command)
299	–	{
300	–	reply->gotdatalen = 0;
301	–	reply->readdata = 0;
302	–	reply->data = NULL;
303	–
304	–	length = recv(fd->fd, tmp, 1, 0);
305	–
306	–	if (length <= 0)
307	–	{
308	–	if ((length == -1) && ignoreErrno(errno))
309	–	goto nodata;
310	–	dead_link_on_read(server, length);
311	–	return;
312	–	}
313	–	reply->command = tmp[0];
314	–	}
315	–
316	–	for (replydef = slinkrpltab; replydef->handler; replydef++)
317	–	{
318	–	if (replydef->replyid == (unsigned int)reply->command)
319	–	break;
320	–	}
321	–
322	–	/* we should be able to trust a local slink process...
323	–	* and if it sends an invalid command, that's a bug.. */
324	–	assert(replydef->handler);
325	–
326	–	if ((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2))
327	–	{
328	–	/* we need a datalen u16 which we don't have yet... */
329	–	length = recv(fd->fd, len, (2 - reply->gotdatalen), 0);
330	–	if (length <= 0)
331	–	{
332	–	if ((length == -1) && ignoreErrno(errno))
333	–	goto nodata;
334	–	dead_link_on_read(server, length);
335	–	return;
336	–	}
337	–
338	–	if (reply->gotdatalen == 0)
339	–	{
340	–	reply->datalen = *len << 8;
341	–	reply->gotdatalen++;
342	–	length--;
343	–	len++;
344	–	}
345	–	if (length && (reply->gotdatalen == 1))
346	–	{
347	–	reply->datalen |= *len;
348	–	reply->gotdatalen++;
349	–	if (reply->datalen > 0)
350	–	reply->data = MyMalloc(reply->datalen);
351	–	}
352	–
353	–	if (reply->gotdatalen < 2)
354	–	return; /* wait for more data */
355	–	}
356	–
357	–	if (reply->readdata < reply->datalen) /* try to get any remaining data */
358	–	{
359	–	length = recv(fd->fd, (reply->data + reply->readdata),
360	–	(reply->datalen - reply->readdata), 0);
361	–	if (length <= 0)
362	–	{
363	–	if ((length == -1) && ignoreErrno(errno))
364	–	goto nodata;
365	–	dead_link_on_read(server, length);
366	–	return;
367	–	}
368	–
369	–	reply->readdata += length;
370	–	if (reply->readdata < reply->datalen)
371	–	return; /* wait for more data */
372	–	}
373	–
374	–	execute_callback(iorecvctrl_cb, server, reply->command);
375	–
376	–	/* we now have the command and any data, pass it off to the handler */
377	–	(*replydef->handler)(reply->command, reply->datalen, reply->data, server);
378	–
379	–	/* reset SlinkRpl */
380	–	if (reply->datalen > 0)
381	–	MyFree(reply->data);
382	–	reply->command = 0;
383	–
384	–	if (IsDead(server))
385	–	return;
386	–
387	–	nodata:
388	–	/* If we get here, we need to register for another COMM_SELECT_READ */
389	–	comm_setselect(fd, COMM_SELECT_READ, read_ctrl_packet, server, 0);
390	–	}
391	–
392	–	/*
284		* read_packet - Read a 'packet' of data from a connection and process it.
285		*/
286		void
287		read_packet(fde_t *fd, void *data)
288		{
289	<	struct Client *client_p = data;
289	>	struct Client *const client_p = data;
290		int length = 0;
291
292		if (IsDefunct(client_p))
#	Line 406 | Line 297 | read_packet(fde_t *fd, void *data)
297		* I personally think it makes the code too hairy to make sane.
298		*     -- adrian
299		*/
300	<	do {
300	>	do
301	>	{
302		#ifdef HAVE_LIBCRYPTO
303		if (fd->ssl)
304		{
305	<	length = SSL_read(fd->ssl, readBuf, READBUF_SIZE);
305	>	length = SSL_read(fd->ssl, readBuf, sizeof(readBuf));
306
307		/* translate openssl error codes, sigh */
308		if (length < 0)
309		switch (SSL_get_error(fd->ssl, length))
310	<	{
310	>	{
311		case SSL_ERROR_WANT_WRITE:
312	<	fd->flags.pending_read = 1;
313	<	SetSendqBlocked(client_p);
314	<	comm_setselect(fd, COMM_SELECT_WRITE, (PF *) sendq_unblocked,
315	<	client_p, 0);
424	<	return;
425	<	case SSL_ERROR_WANT_READ:
426	<	errno = EWOULDBLOCK;
312	>	comm_setselect(fd, COMM_SELECT_WRITE, sendq_unblocked, client_p, 0);
313	>	return;
314	>	case SSL_ERROR_WANT_READ:
315	>	errno = EWOULDBLOCK;
316		case SSL_ERROR_SYSCALL:
317	<	break;
317	>	break;
318	>	case SSL_ERROR_SSL:
319	>	if (errno == EAGAIN)
320	>	break;
321		default:
322	<	length = errno = 0;
323	<	}
322	>	length = errno = 0;
323	>	}
324		}
325		else
326		#endif
327		{
328	<	length = recv(fd->fd, readBuf, READBUF_SIZE, 0);
437	<	#ifdef _WIN32
438	<	if (length < 0)
439	<	errno = WSAGetLastError();
440	<	#endif
328	>	length = recv(fd->fd, readBuf, sizeof(readBuf), 0);
329		}
330
331		if (length <= 0)
332		{
333		/*
334	<	* If true, then we can recover from this error.  Just jump out of
334	>	* If true, then we can recover from this error. Just jump out of
335		* the loop and re-register a new io-request.
336		*/
337		if (length < 0 && ignoreErrno(errno))
#	Line 453 | Line 341 | read_packet(fde_t *fd, void *data)
341		return;
342		}
343
344	<	execute_callback(iorecv_cb, client_p, length, readBuf);
344	>	dbuf_put(&client_p->connection->buf_recvq, readBuf, length);
345	>
346	>	if (client_p->connection->lasttime < CurrentTime)
347	>	client_p->connection->lasttime = CurrentTime;
348
349	<	if (client_p->lasttime < CurrentTime)
350	<	client_p->lasttime = CurrentTime;
460	<	if (client_p->lasttime > client_p->since)
461	<	client_p->since = CurrentTime;
462	<	ClearPingSent(client_p);
349	>	if (client_p->connection->lasttime > client_p->connection->since)
350	>	client_p->connection->since = CurrentTime;
351
352	<	dbuf_put(&client_p->localClient->buf_recvq, readBuf, length);
352	>	DelFlag(client_p, FLAGS_PINGSENT);
353
354		/* Attempt to parse what we have */
355		parse_client_queued(client_p);
#	Line 470 | Line 358 | read_packet(fde_t *fd, void *data)
358		return;
359
360		/* Check to make sure we're not flooding */
361	<	/* TBD - ConfigFileEntry.client_flood should be a size_t */
362	<	if (!(IsServer(client_p) || IsHandshake(client_p) || IsConnecting(client_p))
363	<	&& (dbuf_length(&client_p->localClient->buf_recvq) >
476	<	(unsigned int)ConfigFileEntry.client_flood))
361	>	if (!(IsServer(client_p) || IsHandshake(client_p) || IsConnecting(client_p)) &&
362	>	(dbuf_length(&client_p->connection->buf_recvq) >
363	>	get_recvq(&client_p->connection->confs)))
364		{
365	<	if (!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
366	<	{
480	<	exit_client(client_p, client_p, "Excess Flood");
481	<	return;
482	<	}
365	>	exit_client(client_p, "Excess Flood");
366	>	return;
367		}
368		}
369		#ifdef HAVE_LIBCRYPTO
#	Line 491 | Line 375 | read_packet(fde_t *fd, void *data)
375		/* If we get here, we need to register for another COMM_SELECT_READ */
376		comm_setselect(fd, COMM_SELECT_READ, read_packet, client_p, 0);
377		}
494	–
495	–	/*
496	–	* client_dopacket - copy packet to client buf and parse it
497	–	*      client_p - pointer to client structure for which the buffer data
498	–	*             applies.
499	–	*      buffer - pointr to the buffer containing the newly read data
500	–	*      length - number of valid bytes of data in the buffer
501	–	*
502	–	* Note:
503	–	*      It is implicitly assumed that dopacket is called only
504	–	*      with client_p of "local" variation, which contains all the
505	–	*      necessary fields (buffer etc..)
506	–	*/
507	–	static void
508	–	client_dopacket(struct Client *client_p, char *buffer, size_t length)
509	–	{
510	–	/*
511	–	* Update messages received
512	–	*/
513	–	++me.localClient->recv.messages;
514	–	++client_p->localClient->recv.messages;
515	–
516	–	/*
517	–	* Update bytes received
518	–	*/
519	–	client_p->localClient->recv.bytes += length;
520	–	me.localClient->recv.bytes += length;
521	–
522	–	parse(client_p, buffer, buffer + length);
523	–	}

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