ircd-hybrid/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 "s_conf.h"
#include "s_serv.h"
#include "client.h"
#include "common.h"
#include "ircd.h"
#include "parse.h"
#include "packet.h"
#include "send.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;
          default:
            length = errno = 0;
        }
    }
    else
#endif
    {
      length = recv(fd->fd, readBuf, READBUF_SIZE, 0);
#ifdef _WIN32
      if (length < 0)
        errno = WSAGetLastError();
#endif
    }

    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);
}
Revision:	178
Committed:	Sat Oct 22 10:02:43 2005 UTC (20 years, 9 months ago) by adx
Content type:	text/x-csrc
File size:	13585 byte(s)
Log Message:	- somehow it didn't get committed, fixing
#	User	Rev	Content
1	adx	30	/*
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	knight	31	* $Id$
23	adx	30	*/
24			#include "stdinc.h"
25			#include "s_conf.h"
26			#include "s_serv.h"
27			#include "client.h"
28			#include "common.h"
29			#include "ircd.h"
30			#include "parse.h"
31			#include "packet.h"
32			#include "send.h"
33
34			#define READBUF_SIZE 16384
35
36			struct Callback *iorecv_cb = NULL;
37			struct Callback *iorecvctrl_cb = NULL;
38
39			static char readBuf[READBUF_SIZE];
40			static void client_dopacket(struct Client , char , size_t);
41
42			/* extract_one_line()
43			*
44			* inputs - pointer to a dbuf queue
45			* - pointer to buffer to copy data to
46			* output - length of <buffer>
47			* side effects - one line is copied and removed from the dbuf
48			*/
49			static int
50			extract_one_line(struct dbuf_queue qptr, char buffer)
51			{
52			struct dbuf_block *block;
53			int line_bytes = 0, empty_bytes = 0, phase = 0;
54			unsigned int idx;
55
56			char c;
57			dlink_node *ptr;
58
59			/*
60			* Phase 0: "empty" characters before the line
61			* Phase 1: copying the line
62			* Phase 2: "empty" characters after the line
63			* (delete them as well and free some space in the dbuf)
64			*
65			* Empty characters are CR, LF and space (but, of course, not
66			* in the middle of a line). We try to remove as much of them as we can,
67			* since they simply eat server memory.
68			*
69			* --adx
70			*/
71			DLINK_FOREACH(ptr, qptr->blocks.head)
72			{
73			block = ptr->data;
74
75			for (idx = 0; idx < block->size; idx++)
76			{
77			c = block->data[idx];
78			if (IsEol(c) \|\| (c == ' ' && phase != 1))
79			{
80			empty_bytes++;
81			if (phase == 1)
82			phase = 2;
83			}
84			else switch (phase)
85			{
86			case 0: phase = 1;
87			case 1: if (line_bytes++ < IRCD_BUFSIZE - 2)
88			*buffer++ = c;
89			break;
90			case 2: *buffer = '\0';
91			dbuf_delete(qptr, line_bytes + empty_bytes);
92			return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
93			}
94			}
95			}
96
97			/*
98			* Now, if we haven't reached phase 2, ignore all line bytes
99			* that we have read, since this is a partial line case.
100			*/
101			if (phase != 2)
102			line_bytes = 0;
103			else
104			*buffer = '\0';
105
106			/* Remove what is now unnecessary */
107			dbuf_delete(qptr, line_bytes + empty_bytes);
108			return IRCD_MIN(line_bytes, IRCD_BUFSIZE - 2);
109			}
110
111			/*
112			* parse_client_queued - parse client queued messages
113			*/
114			static void
115			parse_client_queued(struct Client *client_p)
116			{
117			int dolen = 0;
118			int checkflood = 1;
119			struct LocalUser *lclient_p = client_p->localClient;
120
121			if (IsUnknown(client_p))
122			{
123			int i = 0;
124
125			for(;;)
126			{
127			if (IsDefunct(client_p))
128			return;
129
130			/* rate unknown clients at MAX_FLOOD per loop */
131			if (i >= MAX_FLOOD)
132			break;
133
134			dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
135			if (dolen == 0)
136			break;
137
138			client_dopacket(client_p, readBuf, dolen);
139			i++;
140
141			/* if they've dropped out of the unknown state, break and move
142			* to the parsing for their appropriate status. --fl
143			*/
144			if(!IsUnknown(client_p))
145			break;
146			}
147			}
148
149			if (IsServer(client_p) \|\| IsConnecting(client_p) \|\| IsHandshake(client_p))
150			{
151			while (1)
152			{
153			if (IsDefunct(client_p))
154			return;
155			if ((dolen = extract_one_line(&lclient_p->buf_recvq,
156			readBuf)) == 0)
157			break;
158			client_dopacket(client_p, readBuf, dolen);
159			}
160			}
161	adx	178	else if (IsClient(client_p))
162	adx	30	{
163			if (ConfigFileEntry.no_oper_flood && (IsOper(client_p) \|\| IsCanFlood(client_p)))
164			{
165			if (ConfigFileEntry.true_no_oper_flood)
166			checkflood = -1;
167			else
168			checkflood = 0;
169			}
170
171			/*
172			* Handle flood protection here - if we exceed our flood limit on
173			* messages in this loop, we simply drop out of the loop prematurely.
174			* -- adrian
175			*/
176			for (;;)
177			{
178			if (IsDefunct(client_p))
179			break;
180
181			/* This flood protection works as follows:
182			*
183			* A client is given allow_read lines to send to the server. Every
184			* time a line is parsed, sent_parsed is increased. sent_parsed
185			* is decreased by 1 every time flood_recalc is called.
186			*
187			* Thus a client can 'burst' allow_read lines to the server, any
188			* excess lines will be parsed one per flood_recalc() call.
189			*
190			* Therefore a client will be penalised more if they keep flooding,
191			* as sent_parsed will always hover around the allow_read limit
192			* and no 'bursts' will be permitted.
193			*/
194			if (checkflood > 0)
195			{
196			if(lclient_p->sent_parsed >= lclient_p->allow_read)
197			break;
198			}
199
200			/* allow opers 4 times the amount of messages as users. why 4?
201			* why not. :) --fl_
202			*/
203			else if (lclient_p->sent_parsed >= (4 * lclient_p->allow_read) &&
204			checkflood != -1)
205			break;
206
207			dolen = extract_one_line(&lclient_p->buf_recvq, readBuf);
208			if (dolen == 0)
209			break;
210
211			client_dopacket(client_p, readBuf, dolen);
212			lclient_p->sent_parsed++;
213			}
214			}
215			}
216
217			/* flood_endgrace()
218			*
219			* marks the end of the clients grace period
220			*/
221			void
222			flood_endgrace(struct Client *client_p)
223			{
224			SetFloodDone(client_p);
225
226			/* Drop their flood limit back down */
227			client_p->localClient->allow_read = MAX_FLOOD;
228
229			/* sent_parsed could be way over MAX_FLOOD but under MAX_FLOOD_BURST,
230			* so reset it.
231			*/
232			client_p->localClient->sent_parsed = 0;
233			}
234
235			/*
236			* flood_recalc
237			*
238			* recalculate the number of allowed flood lines. this should be called
239			* once a second on any given client. We then attempt to flush some data.
240			*/
241			void
242			flood_recalc(fde_t fd, void data)
243			{
244			struct Client *client_p = data;
245			struct LocalUser *lclient_p = client_p->localClient;
246
247			/* allow a bursting client their allocation per second, allow
248			* a client whos flooding an extra 2 per second
249			*/
250			if (IsFloodDone(client_p))
251			lclient_p->sent_parsed -= 2;
252			else
253			lclient_p->sent_parsed = 0;
254
255			if (lclient_p->sent_parsed < 0)
256			lclient_p->sent_parsed = 0;
257
258			parse_client_queued(client_p);
259
260			/* And now, try flushing .. */
261			if (!IsDead(client_p))
262			{
263			/* and finally, reset the flood check */
264			comm_setflush(fd, 1000, flood_recalc, client_p);
265			}
266			}
267
268			/*
269			* read_ctrl_packet - Read a 'packet' of data from a servlink control
270			* link and process it.
271			*/
272			void
273			read_ctrl_packet(fde_t fd, void data)
274			{
275			struct Client *server = data;
276			struct LocalUser *lserver = server->localClient;
277			struct SlinkRpl *reply;
278			int length = 0;
279			unsigned char tmp[2];
280			unsigned char *len = tmp;
281			struct SlinkRplDef *replydef;
282
283			assert(lserver != NULL);
284
285			reply = &lserver->slinkrpl;
286
287			if (IsDefunct(server))
288			return;
289
290			if (!reply->command)
291			{
292			reply->gotdatalen = 0;
293			reply->readdata = 0;
294			reply->data = NULL;
295
296			length = recv(fd->fd, tmp, 1, 0);
297
298			if (length <= 0)
299			{
300			if ((length == -1) && ignoreErrno(errno))
301			goto nodata;
302			dead_link_on_read(server, length);
303			return;
304			}
305			reply->command = tmp[0];
306			}
307
308			for (replydef = slinkrpltab; replydef->handler; replydef++)
309			{
310			if (replydef->replyid == (unsigned int)reply->command)
311			break;
312			}
313
314			/* we should be able to trust a local slink process...
315			* and if it sends an invalid command, that's a bug.. */
316			assert(replydef->handler);
317
318			if ((replydef->flags & SLINKRPL_FLAG_DATA) && (reply->gotdatalen < 2))
319			{
320			/* we need a datalen u16 which we don't have yet... */
321			length = recv(fd->fd, len, (2 - reply->gotdatalen), 0);
322			if (length <= 0)
323			{
324			if ((length == -1) && ignoreErrno(errno))
325			goto nodata;
326			dead_link_on_read(server, length);
327			return;
328			}
329
330			if (reply->gotdatalen == 0)
331			{
332			reply->datalen = *len << 8;
333			reply->gotdatalen++;
334			length--;
335			len++;
336			}
337			if (length && (reply->gotdatalen == 1))
338			{
339			reply->datalen \|= *len;
340			reply->gotdatalen++;
341			if (reply->datalen > 0)
342			reply->data = MyMalloc(reply->datalen);
343			}
344
345			if (reply->gotdatalen < 2)
346			return; /* wait for more data */
347			}
348
349			if (reply->readdata < reply->datalen) /* try to get any remaining data */
350			{
351			length = recv(fd->fd, (reply->data + reply->readdata),
352			(reply->datalen - reply->readdata), 0);
353			if (length <= 0)
354			{
355			if ((length == -1) && ignoreErrno(errno))
356			goto nodata;
357			dead_link_on_read(server, length);
358			return;
359			}
360
361			reply->readdata += length;
362			if (reply->readdata < reply->datalen)
363			return; /* wait for more data */
364			}
365
366			execute_callback(iorecvctrl_cb, server, reply->command);
367
368			/* we now have the command and any data, pass it off to the handler */
369			(*replydef->handler)(reply->command, reply->datalen, reply->data, server);
370
371			/* reset SlinkRpl */
372			if (reply->datalen > 0)
373			MyFree(reply->data);
374			reply->command = 0;
375
376			if (IsDead(server))
377			return;
378
379			nodata:
380			/* If we get here, we need to register for another COMM_SELECT_READ */
381			comm_setselect(fd, COMM_SELECT_READ, read_ctrl_packet, server, 0);
382			}
383
384			/*
385	adx	178	* iorecv_default - append a packet to the recvq dbuf
386			*/
387			void *
388			iorecv_default(va_list args)
389			{
390			struct Client client_p = va_arg(args, struct Client );
391			int length = va_arg(args, int);
392			char buf = va_arg(args, char );
393
394			dbuf_put(&client_p->localClient->buf_recvq, buf, length);
395			return NULL;
396			}
397
398			/*
399	adx	30	* read_packet - Read a 'packet' of data from a connection and process it.
400			*/
401			void
402			read_packet(fde_t fd, void data)
403			{
404			struct Client *client_p = data;
405			int length = 0;
406
407			if (IsDefunct(client_p))
408			return;
409
410			/*
411			* Read some data. We used to do anti-flood protection here, but
412			* I personally think it makes the code too hairy to make sane.
413			* -- adrian
414			*/
415			do {
416			#ifdef HAVE_LIBCRYPTO
417			if (fd->ssl)
418			{
419			length = SSL_read(fd->ssl, readBuf, READBUF_SIZE);
420
421			/* translate openssl error codes, sigh */
422			if (length < 0)
423			switch (SSL_get_error(fd->ssl, length))
424			{
425			case SSL_ERROR_WANT_WRITE:
426			fd->flags.pending_read = 1;
427			SetSendqBlocked(client_p);
428			comm_setselect(fd, COMM_SELECT_WRITE, (PF *) sendq_unblocked,
429			client_p, 0);
430			return;
431			case SSL_ERROR_WANT_READ:
432			errno = EWOULDBLOCK;
433			case SSL_ERROR_SYSCALL:
434			break;
435			default:
436			length = errno = 0;
437			}
438			}
439			else
440			#endif
441			{
442			length = recv(fd->fd, readBuf, READBUF_SIZE, 0);
443			#ifdef _WIN32
444			if (length < 0)
445			errno = WSAGetLastError();
446			#endif
447			}
448
449			if (length <= 0)
450			{
451			/*
452			* If true, then we can recover from this error. Just jump out of
453			* the loop and re-register a new io-request.
454			*/
455			if (length < 0 && ignoreErrno(errno))
456			break;
457
458			dead_link_on_read(client_p, length);
459			return;
460			}
461
462			execute_callback(iorecv_cb, client_p, length, readBuf);
463
464			if (client_p->lasttime < CurrentTime)
465			client_p->lasttime = CurrentTime;
466			if (client_p->lasttime > client_p->since)
467			client_p->since = CurrentTime;
468			ClearPingSent(client_p);
469
470			/* Attempt to parse what we have */
471			parse_client_queued(client_p);
472
473			if (IsDefunct(client_p))
474			return;
475
476			/* Check to make sure we're not flooding */
477			/* TBD - ConfigFileEntry.client_flood should be a size_t */
478			if (!(IsServer(client_p) \|\| IsHandshake(client_p) \|\| IsConnecting(client_p))
479			&& (dbuf_length(&client_p->localClient->buf_recvq) >
480			(unsigned int)ConfigFileEntry.client_flood))
481			{
482			if (!(ConfigFileEntry.no_oper_flood && IsOper(client_p)))
483			{
484			exit_client(client_p, client_p, "Excess Flood");
485			return;
486			}
487			}
488			}
489			#ifdef HAVE_LIBCRYPTO
490			while (length == sizeof(readBuf) \|\| fd->ssl);
491			#else
492			while (length == sizeof(readBuf));
493			#endif
494
495			/* If we get here, we need to register for another COMM_SELECT_READ */
496			comm_setselect(fd, COMM_SELECT_READ, read_packet, client_p, 0);
497			}
498
499			/*
500			* client_dopacket - copy packet to client buf and parse it
501			* client_p - pointer to client structure for which the buffer data
502			* applies.
503			* buffer - pointr to the buffer containing the newly read data
504			* length - number of valid bytes of data in the buffer
505			*
506			* Note:
507			* It is implicitly assumed that dopacket is called only
508			* with client_p of "local" variation, which contains all the
509			* necessary fields (buffer etc..)
510			*/
511			static void
512			client_dopacket(struct Client client_p, char buffer, size_t length)
513			{
514			/*
515			* Update messages received
516			*/
517			++me.localClient->recv.messages;
518			++client_p->localClient->recv.messages;
519
520			/*
521			* Update bytes received
522			*/
523			client_p->localClient->recv.bytes += length;
524			me.localClient->recv.bytes += length;
525
526			parse(client_p, buffer, buffer + length);
527			}