ircd-hybrid-7.3/src/packet.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  packet.c: Packet handlers.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 *  $Id$
 */
#include "stdinc.h"
#include "list.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_serv.h"
#include "client.h"
#include "common.h"
#include "ircd.h"
#include "parse.h"
#include "fdlist.h"
#include "packet.h"
#include "irc_string.h"
#include "memory.h"
#include "hook.h"
#include "send.h"
#include "irc_getnameinfo.h"

#define READBUF_SIZE 16384

struct Callback *iorecv_cb = NULL;
struct Callback *iorecvctrl_cb = NULL;

static char readBuf[READBUF_SIZE];
static void client_dopacket(struct Client *, char *, size_t);

/* extract_one_line()
 *
 * inputs       - pointer to a dbuf queue
 *              - pointer to buffer to copy data to
 * output       - length of <buffer>
 * side effects - one line is copied and removed from the dbuf
 */
static int
extract_one_line(struct dbuf_queue *qptr, char *buffer)
{
  struct dbuf_block *block;
  int line_bytes = 0, empty_bytes = 0, phase = 0;
  unsigned int idx;

  char c;
  dlink_node *ptr;

  /*
   * Phase 0: "empty" characters before the line
   * Phase 1: copying the line
   * Phase 2: "empty" characters after the line
   *          (delete them as well and free some space in the dbuf)
   *
   * Empty characters are CR, LF and space (but, of course, not
   * in the middle of a line). We try to remove as much of them as we can,
   * since they simply eat server memory.
   *
   * --adx
   */
  DLINK_FOREACH(ptr, qptr->blocks.head)
  {
    block = ptr->data;

    for (idx = 0; idx < block->size; idx++)
    {
      c = block->data[idx];
      if (IsEol(c) || (c == ' ' && phase != 1))
      {
        empty_bytes++;
        if (phase == 1)
          phase = 2;
      }
      else switch (phase)
      {
        case 0: phase = 1;
        case 1: if (line_bytes++ < IRCD_BUFSIZE - 2)
                  *buffer++ = c;
                break;
        case 2: *buffer = '\0';
                dbuf_delete(qptr, line_bytes + empty_bytes);
                return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
      }
    }
  }

  /*
   * Now, if we haven't reached phase 2, ignore all line bytes
   * that we have read, since this is a partial line case.
   */
  if (phase != 2)
    line_bytes = 0;
  else
    *buffer = '\0';

  /* Remove what is now unnecessary */
  dbuf_delete(qptr, line_bytes + empty_bytes);
  return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
}

/*
 * parse_client_queued - parse client queued messages
 */
static void
parse_client_queued(struct Client *client_p)
{ 
  int dolen = 0;
  int checkflood = 1;
  struct LocalUser *lclient_p = client_p->localClient;

  if (IsUnknown(client_p))
  {
    int i = 0;

    for(;;)
    {
      if (IsDefunct(client_p))
        return;

      /* rate unknown clients at MAX_FLOOD per loop */
      if (i >= MAX_FLOOD)
        break;

      dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
      if (dolen == 0)
        break;

      client_dopacket(client_p, readBuf, dolen);
      i++;

      /* if they've dropped out of the unknown state, break and move
       * to the parsing for their appropriate status.  --fl
       */
      if(!IsUnknown(client_p))
        break;
    }
  }

  if (IsServer(client_p) || IsConnecting(client_p) || IsHandshake(client_p))
  {
    while (1)
    {
      if (IsDefunct(client_p))
        return;
      if ((dolen = extract_one_line(&lclient_p->buf_recvq,
                                    readBuf)) == 0)
        break;
      client_dopacket(client_p, readBuf, dolen);
    }
  }
  else if (IsClient(client_p))
  {
    if (ConfigFileEntry.no_oper_flood && (IsOper(client_p) || IsCanFlood(client_p)))
    {
      if (ConfigFileEntry.true_no_oper_flood)
        checkflood = -1;
      else
        checkflood = 0;
    }

    /*
     * Handle flood protection here - if we exceed our flood limit on
     * messages in this loop, we simply drop out of the loop prematurely.
     *   -- adrian
     */
    for (;;)
    {
      if (IsDefunct(client_p))
        break;

      /* This flood protection works as follows:
       *
       * A client is given allow_read lines to send to the server.  Every
       * time a line is parsed, sent_parsed is increased.  sent_parsed
       * is decreased by 1 every time flood_recalc is called.
       *
       * Thus a client can 'burst' allow_read lines to the server, any
       * excess lines will be parsed one per flood_recalc() call.
       *
       * Therefore a client will be penalised more if they keep flooding,
       * as sent_parsed will always hover around the allow_read limit
       * and no 'bursts' will be permitted.
       */
      if (checkflood > 0)
      {
        if(lclient_p->sent_parsed >= lclient_p->allow_read)
          break;
      }
      
      /* allow opers 4 times the amount of messages as users. why 4?
       * why not. :) --fl_
       */
      else if (lclient_p->sent_parsed >= (4 * lclient_p->allow_read) &&
               checkflood != -1)
        break;

      dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
      if (dolen == 0)
        break;

      client_dopacket(client_p, readBuf, dolen);
      lclient_p->sent_parsed++;
    }
  }
}

/* flood_endgrace()
 *
 * marks the end of the clients grace period
 */
void
flood_endgrace(struct Client *client_p)
{
  SetFloodDone(client_p);

  /* Drop their flood limit back down */
  client_p->localClient->allow_read = MAX_FLOOD;

  /* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
   * so reset it.
   */
  client_p->localClient->sent_parsed = 0;
}

/*
 * flood_recalc
 *
 * recalculate the number of allowed flood lines. this should be called
 * once a second on any given client. We then attempt to flush some data.
 */
void
flood_recalc(fde_t *fd, void *data)
{
  struct Client *client_p = data;
  struct LocalUser *lclient_p = client_p->localClient;
 
  /* allow a bursting client their allocation per second, allow
   * a client whos flooding an extra 2 per second
   */
  if (IsFloodDone(client_p))
    lclient_p->sent_parsed -= 2;
  else
    lclient_p->sent_parsed = 0;
  
  if (lclient_p->sent_parsed < 0)
    lclient_p->sent_parsed = 0;
  
  parse_client_queued(client_p);
  
  /* And now, try flushing .. */
  if (!IsDead(client_p))
  {
    /* and finally, reset the flood check */
    comm_setflush(fd, 1000, flood_recalc, client_p);
  }
}

/*
 * read_ctrl_packet - Read a 'packet' of data from a servlink control
 *                    link and process it.
 */
void
read_ctrl_packet(fde_t *fd, void *data)
{
  struct Client *server = data;
  struct LocalUser *lserver = server->localClient;
  struct SlinkRpl *reply;
  int length = 0;
  unsigned char tmp[2];
  unsigned char *len = tmp;
  struct SlinkRplDef *replydef;

  assert(lserver != NULL);
    
  reply = &lserver->slinkrpl;

  if (IsDefunct(server))
    return;

  if (!reply->command)
  {
    reply->gotdatalen = 0;
    reply->readdata = 0;
    reply->data = NULL;

    length = recv(fd->fd, tmp, 1, 0);

    if (length <= 0)
    {
      if ((length == -1) && ignoreErrno(errno))
        goto nodata;
      dead_link_on_read(server, length);
      return;
    }
    reply->command = tmp[0];
  }

  for (replydef = slinkrpltab; replydef->handler; replydef++)
  {
    if (replydef->replyid == (unsigned int)reply->command)
      break;
  }

  /* we should be able to trust a local slink process...
   * and if it sends an invalid command, that's a bug.. */
  assert(replydef->handler);

  if ((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2))
  {
    /* we need a datalen u16 which we don't have yet... */
    length = recv(fd->fd, len, (2 - reply->gotdatalen), 0);
    if (length <= 0)
    {
      if ((length == -1) && ignoreErrno(errno))
        goto nodata;
      dead_link_on_read(server, length);
      return;
    }

    if (reply->gotdatalen == 0)
    {
      reply->datalen = *len << 8;
      reply->gotdatalen++;
      length--;
      len++;
    }
    if (length && (reply->gotdatalen == 1))
    {
      reply->datalen |= *len;
      reply->gotdatalen++;
      if (reply->datalen > 0)
        reply->data = MyMalloc(reply->datalen);
    }

    if (reply->gotdatalen < 2)
      return; /* wait for more data */
  }

  if (reply->readdata < reply->datalen) /* try to get any remaining data */
  {
    length = recv(fd->fd, (reply->data + reply->readdata),
                  (reply->datalen - reply->readdata), 0);
    if (length <= 0)
    {
      if ((length == -1) && ignoreErrno(errno))
        goto nodata;
      dead_link_on_read(server, length);
      return;
    }

    reply->readdata += length;
    if (reply->readdata < reply->datalen)
      return; /* wait for more data */
  }

  execute_callback(iorecvctrl_cb, server, reply->command);

  /* we now have the command and any data, pass it off to the handler */
  (*replydef->handler)(reply->command, reply->datalen, reply->data, server);

  /* reset SlinkRpl */                      
  if (reply->datalen > 0)
    MyFree(reply->data);
  reply->command = 0;

  if (IsDead(server))
    return;

nodata:
  /* If we get here, we need to register for another COMM_SELECT_READ */
  comm_setselect(fd, COMM_SELECT_READ, read_ctrl_packet, server, 0);
}

/*
 * iorecv_default - append a packet to the recvq dbuf
 */
void *
iorecv_default(va_list args)
{
  struct Client *client_p = va_arg(args, struct Client *);
  int length = va_arg(args, int);
  char *buf = va_arg(args, char *);

  dbuf_put(&client_p->localClient->buf_recvq, buf, length);
  return NULL;
}

/*
 * read_packet - Read a 'packet' of data from a connection and process it.
 */
void
read_packet(fde_t *fd, void *data)
{
  struct Client *client_p = data;
  int length = 0;

  if (IsDefunct(client_p))
    return;

  /*
   * Read some data. We *used to* do anti-flood protection here, but
   * I personally think it makes the code too hairy to make sane.
   *     -- adrian
   */
  do {
#ifdef HAVE_LIBCRYPTO
    if (fd->ssl)
    {
      length = SSL_read(fd->ssl, readBuf, READBUF_SIZE);

      /* translate openssl error codes, sigh */
      if (length < 0)
        switch (SSL_get_error(fd->ssl, length))
        {
          case SSL_ERROR_WANT_WRITE:
            fd->flags.pending_read = 1;
            SetSendqBlocked(client_p);
            comm_setselect(fd, COMM_SELECT_WRITE, (PF *) sendq_unblocked,
                           client_p, 0);
            return;
          case SSL_ERROR_WANT_READ:
            errno = EWOULDBLOCK;
          case SSL_ERROR_SYSCALL:
            break;
          case SSL_ERROR_SSL:
            if (errno == EAGAIN)
              break;
          default:
            length = errno = 0;
        }
    }
    else
#endif
    {
      length = recv(fd->fd, readBuf, READBUF_SIZE, 0);
    }

    if (length <= 0)
    {
      /*
       * If true, then we can recover from this error.  Just jump out of
       * the loop and re-register a new io-request.
       */
      if (length < 0 && ignoreErrno(errno))
        break;

      dead_link_on_read(client_p, length);
      return;
    }

    execute_callback(iorecv_cb, client_p, length, readBuf);

    if (client_p->lasttime < CurrentTime)
      client_p->lasttime = CurrentTime;
    if (client_p->lasttime > client_p->since)
      client_p->since = CurrentTime;
    ClearPingSent(client_p);

    /* Attempt to parse what we have */
    parse_client_queued(client_p);

    if (IsDefunct(client_p))
      return;

    /* Check to make sure we're not flooding */
    /* TBD - ConfigFileEntry.client_flood should be a size_t */
    if (!(IsServer(client_p) || IsHandshake(client_p) || IsConnecting(client_p))
        && (dbuf_length(&client_p->localClient->buf_recvq) >
            (unsigned int)ConfigFileEntry.client_flood))
    {
      if (!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
      {
        exit_client(client_p, client_p, "Excess Flood");
        return;
      }
    }
  }
#ifdef HAVE_LIBCRYPTO
  while (length == sizeof(readBuf) || fd->ssl);
#else
  while (length == sizeof(readBuf));
#endif

  /* If we get here, we need to register for another COMM_SELECT_READ */
  comm_setselect(fd, COMM_SELECT_READ, read_packet, client_p, 0);
}

/*
 * client_dopacket - copy packet to client buf and parse it
 *      client_p - pointer to client structure for which the buffer data
 *             applies.
 *      buffer - pointr to the buffer containing the newly read data
 *      length - number of valid bytes of data in the buffer
 *
 * Note:
 *      It is implicitly assumed that dopacket is called only
 *      with client_p of "local" variation, which contains all the
 *      necessary fields (buffer etc..)
 */
static void
client_dopacket(struct Client *client_p, char *buffer, size_t length)
{
  /* 
   * Update messages received
   */
  ++me.localClient->recv.messages;
  ++client_p->localClient->recv.messages;

  /* 
   * Update bytes received
   */
  client_p->localClient->recv.bytes += length;
  me.localClient->recv.bytes += length;

  parse(client_p, buffer, buffer + length);
}
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* packet.c: Packet handlers.
4	*
5	* Copyright (C) 2002 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*/
24	#include "stdinc.h"
25	#include "list.h"
26	#include "s_bsd.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 "fdlist.h"
34	#include "packet.h"
35	#include "irc_string.h"
36	#include "memory.h"
37	#include "hook.h"
38	#include "send.h"
39	#include "irc_getnameinfo.h"
40
41	#define READBUF_SIZE 16384
42
43	struct Callback *iorecv_cb = NULL;
44	struct Callback *iorecvctrl_cb = NULL;
45
46	static char readBuf[READBUF_SIZE];
47	static void client_dopacket(struct Client , char , size_t);
48
49	/* extract_one_line()
50	*
51	* inputs - pointer to a dbuf queue
52	* - pointer to buffer to copy data to
53	* output - length of <buffer>
54	* side effects - one line is copied and removed from the dbuf
55	*/
56	static int
57	extract_one_line(struct dbuf_queue qptr, char buffer)
58	{
59	struct dbuf_block *block;
60	int line_bytes = 0, empty_bytes = 0, phase = 0;
61	unsigned int idx;
62
63	char c;
64	dlink_node *ptr;
65
66	/*
67	* Phase 0: "empty" characters before the line
68	* Phase 1: copying the line
69	* Phase 2: "empty" characters after the line
70	* (delete them as well and free some space in the dbuf)
71	*
72	* Empty characters are CR, LF and space (but, of course, not
73	* in the middle of a line). We try to remove as much of them as we can,
74	* since they simply eat server memory.
75	*
76	* --adx
77	*/
78	DLINK_FOREACH(ptr, qptr->blocks.head)
79	{
80	block = ptr->data;
81
82	for (idx = 0; idx < block->size; idx++)
83	{
84	c = block->data[idx];
85	if (IsEol(c) \|\| (c == ' ' && phase != 1))
86	{
87	empty_bytes++;
88	if (phase == 1)
89	phase = 2;
90	}
91	else switch (phase)
92	{
93	case 0: phase = 1;
94	case 1: if (line_bytes++ < IRCD_BUFSIZE - 2)
95	*buffer++ = c;
96	break;
97	case 2: *buffer = '\0';
98	dbuf_delete(qptr, line_bytes + empty_bytes);
99	return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
100	}
101	}
102	}
103
104	/*
105	* Now, if we haven't reached phase 2, ignore all line bytes
106	* that we have read, since this is a partial line case.
107	*/
108	if (phase != 2)
109	line_bytes = 0;
110	else
111	*buffer = '\0';
112
113	/* Remove what is now unnecessary */
114	dbuf_delete(qptr, line_bytes + empty_bytes);
115	return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
116	}
117
118	/*
119	* parse_client_queued - parse client queued messages
120	*/
121	static void
122	parse_client_queued(struct Client *client_p)
123	{
124	int dolen = 0;
125	int checkflood = 1;
126	struct LocalUser *lclient_p = client_p->localClient;
127
128	if (IsUnknown(client_p))
129	{
130	int i = 0;
131
132	for(;;)
133	{
134	if (IsDefunct(client_p))
135	return;
136
137	/* rate unknown clients at MAX_FLOOD per loop */
138	if (i >= MAX_FLOOD)
139	break;
140
141	dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
142	if (dolen == 0)
143	break;
144
145	client_dopacket(client_p, readBuf, dolen);
146	i++;
147
148	/* if they've dropped out of the unknown state, break and move
149	* to the parsing for their appropriate status. --fl
150	*/
151	if(!IsUnknown(client_p))
152	break;
153	}
154	}
155
156	if (IsServer(client_p) \|\| IsConnecting(client_p) \|\| IsHandshake(client_p))
157	{
158	while (1)
159	{
160	if (IsDefunct(client_p))
161	return;
162	if ((dolen = extract_one_line(&lclient_p->buf_recvq,
163	readBuf)) == 0)
164	break;
165	client_dopacket(client_p, readBuf, dolen);
166	}
167	}
168	else if (IsClient(client_p))
169	{
170	if (ConfigFileEntry.no_oper_flood && (IsOper(client_p) \|\| IsCanFlood(client_p)))
171	{
172	if (ConfigFileEntry.true_no_oper_flood)
173	checkflood = -1;
174	else
175	checkflood = 0;
176	}
177
178	/*
179	* Handle flood protection here - if we exceed our flood limit on
180	* messages in this loop, we simply drop out of the loop prematurely.
181	* -- adrian
182	*/
183	for (;;)
184	{
185	if (IsDefunct(client_p))
186	break;
187
188	/* This flood protection works as follows:
189	*
190	* A client is given allow_read lines to send to the server. Every
191	* time a line is parsed, sent_parsed is increased. sent_parsed
192	* is decreased by 1 every time flood_recalc is called.
193	*
194	* Thus a client can 'burst' allow_read lines to the server, any
195	* excess lines will be parsed one per flood_recalc() call.
196	*
197	* Therefore a client will be penalised more if they keep flooding,
198	* as sent_parsed will always hover around the allow_read limit
199	* and no 'bursts' will be permitted.
200	*/
201	if (checkflood > 0)
202	{
203	if(lclient_p->sent_parsed >= lclient_p->allow_read)
204	break;
205	}
206
207	/* allow opers 4 times the amount of messages as users. why 4?
208	* why not. :) --fl_
209	*/
210	else if (lclient_p->sent_parsed >= (4 * lclient_p->allow_read) &&
211	checkflood != -1)
212	break;
213
214	dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
215	if (dolen == 0)
216	break;
217
218	client_dopacket(client_p, readBuf, dolen);
219	lclient_p->sent_parsed++;
220	}
221	}
222	}
223
224	/* flood_endgrace()
225	*
226	* marks the end of the clients grace period
227	*/
228	void
229	flood_endgrace(struct Client *client_p)
230	{
231	SetFloodDone(client_p);
232
233	/* Drop their flood limit back down */
234	client_p->localClient->allow_read = MAX_FLOOD;
235
236	/* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
237	* so reset it.
238	*/
239	client_p->localClient->sent_parsed = 0;
240	}
241
242	/*
243	* flood_recalc
244	*
245	* recalculate the number of allowed flood lines. this should be called
246	* once a second on any given client. We then attempt to flush some data.
247	*/
248	void
249	flood_recalc(fde_t fd, void data)
250	{
251	struct Client *client_p = data;
252	struct LocalUser *lclient_p = client_p->localClient;
253
254	/* allow a bursting client their allocation per second, allow
255	* a client whos flooding an extra 2 per second
256	*/
257	if (IsFloodDone(client_p))
258	lclient_p->sent_parsed -= 2;
259	else
260	lclient_p->sent_parsed = 0;
261
262	if (lclient_p->sent_parsed < 0)
263	lclient_p->sent_parsed = 0;
264
265	parse_client_queued(client_p);
266
267	/* And now, try flushing .. */
268	if (!IsDead(client_p))
269	{
270	/* and finally, reset the flood check */
271	comm_setflush(fd, 1000, flood_recalc, client_p);
272	}
273	}
274
275	/*
276	* read_ctrl_packet - Read a 'packet' of data from a servlink control
277	* link and process it.
278	*/
279	void
280	read_ctrl_packet(fde_t fd, void data)
281	{
282	struct Client *server = data;
283	struct LocalUser *lserver = server->localClient;
284	struct SlinkRpl *reply;
285	int length = 0;
286	unsigned char tmp[2];
287	unsigned char *len = tmp;
288	struct SlinkRplDef *replydef;
289
290	assert(lserver != NULL);
291
292	reply = &lserver->slinkrpl;
293
294	if (IsDefunct(server))
295	return;
296
297	if (!reply->command)
298	{
299	reply->gotdatalen = 0;
300	reply->readdata = 0;
301	reply->data = NULL;
302
303	length = recv(fd->fd, tmp, 1, 0);
304
305	if (length <= 0)
306	{
307	if ((length == -1) && ignoreErrno(errno))
308	goto nodata;
309	dead_link_on_read(server, length);
310	return;
311	}
312	reply->command = tmp[0];
313	}
314
315	for (replydef = slinkrpltab; replydef->handler; replydef++)
316	{
317	if (replydef->replyid == (unsigned int)reply->command)
318	break;
319	}
320
321	/* we should be able to trust a local slink process...
322	* and if it sends an invalid command, that's a bug.. */
323	assert(replydef->handler);
324
325	if ((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2))
326	{
327	/* we need a datalen u16 which we don't have yet... */
328	length = recv(fd->fd, len, (2 - reply->gotdatalen), 0);
329	if (length <= 0)
330	{
331	if ((length == -1) && ignoreErrno(errno))
332	goto nodata;
333	dead_link_on_read(server, length);
334	return;
335	}
336
337	if (reply->gotdatalen == 0)
338	{
339	reply->datalen = *len << 8;
340	reply->gotdatalen++;
341	length--;
342	len++;
343	}
344	if (length && (reply->gotdatalen == 1))
345	{
346	reply->datalen \|= *len;
347	reply->gotdatalen++;
348	if (reply->datalen > 0)
349	reply->data = MyMalloc(reply->datalen);
350	}
351
352	if (reply->gotdatalen < 2)
353	return; /* wait for more data */
354	}
355
356	if (reply->readdata < reply->datalen) /* try to get any remaining data */
357	{
358	length = recv(fd->fd, (reply->data + reply->readdata),
359	(reply->datalen - reply->readdata), 0);
360	if (length <= 0)
361	{
362	if ((length == -1) && ignoreErrno(errno))
363	goto nodata;
364	dead_link_on_read(server, length);
365	return;
366	}
367
368	reply->readdata += length;
369	if (reply->readdata < reply->datalen)
370	return; /* wait for more data */
371	}
372
373	execute_callback(iorecvctrl_cb, server, reply->command);
374
375	/* we now have the command and any data, pass it off to the handler */
376	(*replydef->handler)(reply->command, reply->datalen, reply->data, server);
377
378	/* reset SlinkRpl */
379	if (reply->datalen > 0)
380	MyFree(reply->data);
381	reply->command = 0;
382
383	if (IsDead(server))
384	return;
385
386	nodata:
387	/* If we get here, we need to register for another COMM_SELECT_READ */
388	comm_setselect(fd, COMM_SELECT_READ, read_ctrl_packet, server, 0);
389	}
390
391	/*
392	* iorecv_default - append a packet to the recvq dbuf
393	*/
394	void *
395	iorecv_default(va_list args)
396	{
397	struct Client client_p = va_arg(args, struct Client );
398	int length = va_arg(args, int);
399	char buf = va_arg(args, char );
400
401	dbuf_put(&client_p->localClient->buf_recvq, buf, length);
402	return NULL;
403	}
404
405	/*
406	* read_packet - Read a 'packet' of data from a connection and process it.
407	*/
408	void
409	read_packet(fde_t fd, void data)
410	{
411	struct Client *client_p = data;
412	int length = 0;
413
414	if (IsDefunct(client_p))
415	return;
416
417	/*
418	* Read some data. We used to do anti-flood protection here, but
419	* I personally think it makes the code too hairy to make sane.
420	* -- adrian
421	*/
422	do {
423	#ifdef HAVE_LIBCRYPTO
424	if (fd->ssl)
425	{
426	length = SSL_read(fd->ssl, readBuf, READBUF_SIZE);
427
428	/* translate openssl error codes, sigh */
429	if (length < 0)
430	switch (SSL_get_error(fd->ssl, length))
431	{
432	case SSL_ERROR_WANT_WRITE:
433	fd->flags.pending_read = 1;
434	SetSendqBlocked(client_p);
435	comm_setselect(fd, COMM_SELECT_WRITE, (PF *) sendq_unblocked,
436	client_p, 0);
437	return;
438	case SSL_ERROR_WANT_READ:
439	errno = EWOULDBLOCK;
440	case SSL_ERROR_SYSCALL:
441	break;
442	case SSL_ERROR_SSL:
443	if (errno == EAGAIN)
444	break;
445	default:
446	length = errno = 0;
447	}
448	}
449	else
450	#endif
451	{
452	length = recv(fd->fd, readBuf, READBUF_SIZE, 0);
453	}
454
455	if (length <= 0)
456	{
457	/*
458	* If true, then we can recover from this error. Just jump out of
459	* the loop and re-register a new io-request.
460	*/
461	if (length < 0 && ignoreErrno(errno))
462	break;
463
464	dead_link_on_read(client_p, length);
465	return;
466	}
467
468	execute_callback(iorecv_cb, client_p, length, readBuf);
469
470	if (client_p->lasttime < CurrentTime)
471	client_p->lasttime = CurrentTime;
472	if (client_p->lasttime > client_p->since)
473	client_p->since = CurrentTime;
474	ClearPingSent(client_p);
475
476	/* Attempt to parse what we have */
477	parse_client_queued(client_p);
478
479	if (IsDefunct(client_p))
480	return;
481
482	/* Check to make sure we're not flooding */
483	/* TBD - ConfigFileEntry.client_flood should be a size_t */
484	if (!(IsServer(client_p) \|\| IsHandshake(client_p) \|\| IsConnecting(client_p))
485	&& (dbuf_length(&client_p->localClient->buf_recvq) >
486	(unsigned int)ConfigFileEntry.client_flood))
487	{
488	if (!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
489	{
490	exit_client(client_p, client_p, "Excess Flood");
491	return;
492	}
493	}
494	}
495	#ifdef HAVE_LIBCRYPTO
496	while (length == sizeof(readBuf) \|\| fd->ssl);
497	#else
498	while (length == sizeof(readBuf));
499	#endif
500
501	/* If we get here, we need to register for another COMM_SELECT_READ */
502	comm_setselect(fd, COMM_SELECT_READ, read_packet, client_p, 0);
503	}
504
505	/*
506	* client_dopacket - copy packet to client buf and parse it
507	* client_p - pointer to client structure for which the buffer data
508	* applies.
509	* buffer - pointr to the buffer containing the newly read data
510	* length - number of valid bytes of data in the buffer
511	*
512	* Note:
513	* It is implicitly assumed that dopacket is called only
514	* with client_p of "local" variation, which contains all the
515	* necessary fields (buffer etc..)
516	*/
517	static void
518	client_dopacket(struct Client client_p, char buffer, size_t length)
519	{
520	/*
521	* Update messages received
522	*/
523	++me.localClient->recv.messages;
524	++client_p->localClient->recv.messages;
525
526	/*
527	* Update bytes received
528	*/
529	client_p->localClient->recv.bytes += length;
530	me.localClient->recv.bytes += length;
531
532	parse(client_p, buffer, buffer + length);
533	}
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