8.2.x/src/listener.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  listener.c: Listens on a port.
 *
 *  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 "listener.h"
#include "client.h"
#include "fdlist.h"
#include "irc_string.h"
#include "sprintf_irc.h"
#include "ircd.h"
#include "ircd_defs.h"
#include "s_bsd.h"
#include "numeric.h"
#include "conf.h"
#include "send.h"
#include "memory.h"

static PF accept_connection;

static dlink_list ListenerPollList = { NULL, NULL, 0 };
static void close_listener(struct Listener *listener);

static struct Listener *
make_listener(int port, struct irc_ssaddr *addr)
{
  struct Listener *listener = MyMalloc(sizeof(struct Listener));

  listener->port = port;
  memcpy(&listener->addr, addr, sizeof(struct irc_ssaddr));

  return listener;
}

void
free_listener(struct Listener *listener)
{
  assert(listener != NULL);

  dlinkDelete(&listener->listener_node, &ListenerPollList);
  MyFree(listener);
}

/*
 * get_listener_name - return displayable listener name and port
 * returns "host.foo.org/6667" for a given listener
 */
const char *
get_listener_name(const struct Listener *const listener)
{
  static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4];

  snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name,
           listener->name, listener->port);
  return buf;
}

/* show_ports()
 *
 * inputs       - pointer to client to show ports to
 * output       - none
 * side effects - send port listing to a client
 */
void 
show_ports(struct Client *source_p)
{
  char buf[6];
  char *p = NULL;
  dlink_node *ptr;

  DLINK_FOREACH(ptr, ListenerPollList.head)
  {
    const struct Listener *listener = ptr->data;
    p = buf;

    if (listener->flags & LISTENER_HIDDEN) {
      if (!HasUMode(source_p, UMODE_ADMIN))
        continue;
      *p++ = 'H';
    }

    if (listener->flags & LISTENER_SERVER)
      *p++ = 'S';
    if (listener->flags & LISTENER_SSL)
      *p++ = 's';
    *p = '\0';
    sendto_one(source_p, form_str(RPL_STATSPLINE),
               me.name, source_p->name, 'P', listener->port,
               HasUMode(source_p, UMODE_ADMIN) ? listener->name : me.name,
               listener->ref_count, buf,
               listener->active ? "active" : "disabled");
  }
}

/*
 * inetport - create a listener socket in the AF_INET or AF_INET6 domain,
 * bind it to the port given in 'port' and listen to it
 * returns true (1) if successful false (0) on error.
 *
 * If the operating system has a define for SOMAXCONN, use it, otherwise
 * use HYBRID_SOMAXCONN
 */
#ifdef SOMAXCONN
#undef HYBRID_SOMAXCONN
#define HYBRID_SOMAXCONN SOMAXCONN
#endif

static int 
inetport(struct Listener *listener)
{
  struct irc_ssaddr lsin;
  socklen_t opt = 1;

  memset(&lsin, 0, sizeof(lsin));
  memcpy(&lsin, &listener->addr, sizeof(lsin));

  getnameinfo((struct sockaddr *)&lsin, lsin.ss_len, listener->name,
              sizeof(listener->name), NULL, 0, NI_NUMERICHOST);

  /*
   * At first, open a new socket
   */
  if (comm_open(&listener->fd, listener->addr.ss.ss_family, SOCK_STREAM, 0,
                "Listener socket") == -1)
  {
    report_error(L_ALL, "opening listener socket %s:%s",
                 get_listener_name(listener), errno);
    return 0;
  }

  if (setsockopt(listener->fd.fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)))
  {
    report_error(L_ALL, "setting SO_REUSEADDR for listener %s:%s",
                 get_listener_name(listener), errno);
    fd_close(&listener->fd);
    return 0;
  }

  /*
   * Bind a port to listen for new connections if port is non-null,
   * else assume it is already open and try get something from it.
   */
  lsin.ss_port = htons(listener->port);

  if (bind(listener->fd.fd, (struct sockaddr *)&lsin, lsin.ss_len))
  {
    report_error(L_ALL, "binding listener socket %s:%s",
                 get_listener_name(listener), errno);
    fd_close(&listener->fd);
    return 0;
  }

  if (listen(listener->fd.fd, HYBRID_SOMAXCONN))
  {
    report_error(L_ALL, "listen failed for %s:%s",
                 get_listener_name(listener), errno);
    fd_close(&listener->fd);
    return 0;
  }

  /* Listen completion events are READ events .. */

  accept_connection(&listener->fd, listener);
  return 1;
}

static struct Listener *
find_listener(int port, struct irc_ssaddr *addr)
{
  dlink_node *ptr;
  struct Listener *listener    = NULL;
  struct Listener *last_closed = NULL;

  DLINK_FOREACH(ptr, ListenerPollList.head)
  {
    listener = ptr->data;

    if ((port == listener->port) &&
        (!memcmp(addr, &listener->addr, sizeof(struct irc_ssaddr))))
    {
      /* Try to return an open listener, otherwise reuse a closed one */
      if (!listener->fd.flags.open)
        last_closed = listener;
      else
        return (listener);
    }
  }

  return (last_closed);
}

/*
 * add_listener- create a new listener
 * port - the port number to listen on
 * vhost_ip - if non-null must contain a valid IP address string in
 * the format "255.255.255.255"
 */
void 
add_listener(int port, const char *vhost_ip, unsigned int flags)
{
  struct Listener *listener;
  struct irc_ssaddr vaddr;
  struct addrinfo hints, *res;
  char portname[PORTNAMELEN + 1];
#ifdef IPV6
  static short int pass = 0; /* if ipv6 and no address specified we need to
                                have two listeners; one for each protocol. */
#endif

  /*
   * if no or invalid port in conf line, don't bother
   */
  if (!(port > 0 && port <= 0xFFFF))
    return;

  memset(&vaddr, 0, sizeof(vaddr));

  /* Set up the hints structure */
  memset(&hints, 0, sizeof(hints));
  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  /* Get us ready for a bind() and don't bother doing dns lookup */
  hints.ai_flags = AI_PASSIVE | AI_NUMERICHOST;

#ifdef IPV6
  if (ServerInfo.can_use_v6)
  {
    snprintf(portname, sizeof(portname), "%d", port);
    getaddrinfo("::", portname, &hints, &res);
    vaddr.ss.ss_family = AF_INET6;
    assert(res != NULL);

    memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen);
    vaddr.ss_port = port;
    vaddr.ss_len = res->ai_addrlen;
    freeaddrinfo(res);
  }
  else
#endif
  {
    struct sockaddr_in *v4 = (struct sockaddr_in*) &vaddr;
    v4->sin_addr.s_addr = INADDR_ANY;
    vaddr.ss.ss_family = AF_INET;
    vaddr.ss_len = sizeof(struct sockaddr_in);
    v4->sin_port = htons(port);
  }

  snprintf(portname, PORTNAMELEN, "%d", port);

  if (vhost_ip)
  {
    if (getaddrinfo(vhost_ip, portname, &hints, &res))
      return;

    assert(res != NULL);

    memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen);
    vaddr.ss_port = port;
    vaddr.ss_len = res->ai_addrlen;
    freeaddrinfo(res);
  }
#ifdef IPV6
  else if (pass == 0 && ServerInfo.can_use_v6)
  {
    /* add the ipv4 listener if we havent already */
    pass = 1;
    add_listener(port, "0.0.0.0", flags);
  }
  pass = 0;
#endif

  if ((listener = find_listener(port, &vaddr)))
  {
    listener->flags = flags;
    if (listener->fd.flags.open)
      return;
  }
  else
  {
    listener = make_listener(port, &vaddr);
    dlinkAdd(listener, &listener->listener_node, &ListenerPollList);
    listener->flags = flags;
  }

  if (inetport(listener))
    listener->active = 1;
  else
    close_listener(listener);
}

/*
 * close_listener - close a single listener
 */
static void
close_listener(struct Listener *listener)
{
  assert(listener != NULL);

  if (listener == NULL)
    return;

  if (listener->fd.flags.open)
    fd_close(&listener->fd);

  listener->active = 0;

  if (listener->ref_count)
    return;

  free_listener(listener);
}

/*
 * close_listeners - close and free all listeners that are not being used
 */
void 
close_listeners(void)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;

  /* close all 'extra' listening ports we have */
  DLINK_FOREACH_SAFE(ptr, next_ptr, ListenerPollList.head)
    close_listener(ptr->data);
}

#define TOOFAST_WARNING "ERROR :Trying to reconnect too fast.\r\n"
#define DLINE_WARNING "ERROR :You have been D-lined.\r\n"

static void 
accept_connection(fde_t *pfd, void *data)
{
  static time_t last_oper_notice = 0;
  struct irc_ssaddr addr;
  int fd;
  int pe;
  struct Listener *listener = data;

  memset(&addr, 0, sizeof(addr));

  assert(listener != NULL);

  /* There may be many reasons for error return, but
   * in otherwise correctly working environment the
   * probable cause is running out of file descriptors
   * (EMFILE, ENFILE or others?). The man pages for
   * accept don't seem to list these as possible,
   * although it's obvious that it may happen here.
   * Thus no specific errors are tested at this
   * point, just assume that connections cannot
   * be accepted until some old is closed first.
   */
  while ((fd = comm_accept(listener, &addr)) != -1)
  {
    /*
     * check for connection limit
     */
    if (number_fd > hard_fdlimit - 10)
    {
      ++ServerStats.is_ref;

      /*
       * slow down the whining to opers bit
       */
      if ((last_oper_notice + 20) <= CurrentTime)
      {
        sendto_realops_flags(UMODE_ALL, L_ALL, "All connections in use. (%s)",
                             get_listener_name(listener));
        last_oper_notice = CurrentTime;
      }

      if (!(listener->flags & LISTENER_SSL))
        send(fd, "ERROR :All connections in use\r\n", 32, 0);

      close(fd);
      break;    /* jump out and re-register a new io request */
    }

    /*
     * Do an initial check we aren't connecting too fast or with too many
     * from this IP...
     */
    if ((pe = conf_connect_allowed(&addr, addr.ss.ss_family)) != 0)
    {
      ++ServerStats.is_ref;

      if (!(listener->flags & LISTENER_SSL))
        switch (pe)
        {
          case BANNED_CLIENT:
            send(fd, DLINE_WARNING, sizeof(DLINE_WARNING)-1, 0);
            break;
          case TOO_FAST:
            send(fd, TOOFAST_WARNING, sizeof(TOOFAST_WARNING)-1, 0);
            break;
        }

      close(fd);
      continue;    /* drop the one and keep on clearing the queue */
    }

    ++ServerStats.is_ac;
    add_connection(listener, &addr, fd);
  }

  /* Re-register a new IO request for the next accept .. */
  comm_setselect(&listener->fd, COMM_SELECT_READ, accept_connection,
                 listener, 0);
}
Revision:	1592
Committed:	Sat Oct 27 21:02:32 2012 UTC (11 years, 5 months ago) by michael
Content type:	text/x-csrc
Original Path:	*ircd-hybrid/trunk/src/listener.c*
File size:	11022 byte(s)
Log Message:	- Second time's the charm? Moving svnroot/ircd-hybrid-8 to svnroot/ircd-hybrid/trunk
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* listener.c: Listens on a port.
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
25			#include "stdinc.h"
26	michael	1011	#include "list.h"
27	adx	30	#include "listener.h"
28			#include "client.h"
29			#include "fdlist.h"
30			#include "irc_string.h"
31			#include "sprintf_irc.h"
32			#include "ircd.h"
33			#include "ircd_defs.h"
34			#include "s_bsd.h"
35			#include "numeric.h"
36	michael	1309	#include "conf.h"
37	adx	30	#include "send.h"
38			#include "memory.h"
39
40			static PF accept_connection;
41
42			static dlink_list ListenerPollList = { NULL, NULL, 0 };
43			static void close_listener(struct Listener *listener);
44
45			static struct Listener *
46			make_listener(int port, struct irc_ssaddr *addr)
47			{
48			struct Listener *listener = MyMalloc(sizeof(struct Listener));
49
50			listener->port = port;
51			memcpy(&listener->addr, addr, sizeof(struct irc_ssaddr));
52
53			return listener;
54			}
55
56			void
57			free_listener(struct Listener *listener)
58			{
59			assert(listener != NULL);
60
61			dlinkDelete(&listener->listener_node, &ListenerPollList);
62			MyFree(listener);
63			}
64
65			/*
66			* get_listener_name - return displayable listener name and port
67	michael	1242	* returns "host.foo.org/6667" for a given listener
68	adx	30	*/
69			const char *
70	michael	1123	get_listener_name(const struct Listener *const listener)
71	adx	30	{
72			static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4];
73
74	michael	1123	snprintf(buf, sizeof(buf), "%s[%s/%u]", me.name,
75			listener->name, listener->port);
76	michael	900	return buf;
77	adx	30	}
78
79			/* show_ports()
80			*
81			* inputs - pointer to client to show ports to
82			* output - none
83			* side effects - send port listing to a client
84			*/
85			void
86			show_ports(struct Client *source_p)
87			{
88	michael	900	char buf[6];
89	adx	30	char *p = NULL;
90			dlink_node *ptr;
91
92			DLINK_FOREACH(ptr, ListenerPollList.head)
93			{
94			const struct Listener *listener = ptr->data;
95			p = buf;
96
97			if (listener->flags & LISTENER_HIDDEN) {
98	michael	1219	if (!HasUMode(source_p, UMODE_ADMIN))
99	adx	30	continue;
100			*p++ = 'H';
101			}
102
103	michael	900	if (listener->flags & LISTENER_SERVER)
104			*p++ = 'S';
105	adx	30	if (listener->flags & LISTENER_SSL)
106			*p++ = 's';
107			*p = '\0';
108			sendto_one(source_p, form_str(RPL_STATSPLINE),
109			me.name, source_p->name, 'P', listener->port,
110	michael	1219	HasUMode(source_p, UMODE_ADMIN) ? listener->name : me.name,
111	adx	30	listener->ref_count, buf,
112			listener->active ? "active" : "disabled");
113			}
114			}
115
116			/*
117			* inetport - create a listener socket in the AF_INET or AF_INET6 domain,
118			* bind it to the port given in 'port' and listen to it
119			* returns true (1) if successful false (0) on error.
120			*
121			* If the operating system has a define for SOMAXCONN, use it, otherwise
122			* use HYBRID_SOMAXCONN
123			*/
124			#ifdef SOMAXCONN
125			#undef HYBRID_SOMAXCONN
126			#define HYBRID_SOMAXCONN SOMAXCONN
127			#endif
128
129			static int
130			inetport(struct Listener *listener)
131			{
132			struct irc_ssaddr lsin;
133			socklen_t opt = 1;
134
135	michael	1123	memset(&lsin, 0, sizeof(lsin));
136			memcpy(&lsin, &listener->addr, sizeof(lsin));
137
138			getnameinfo((struct sockaddr *)&lsin, lsin.ss_len, listener->name,
139			sizeof(listener->name), NULL, 0, NI_NUMERICHOST);
140
141	adx	30	/*
142			* At first, open a new socket
143			*/
144			if (comm_open(&listener->fd, listener->addr.ss.ss_family, SOCK_STREAM, 0,
145			"Listener socket") == -1)
146			{
147			report_error(L_ALL, "opening listener socket %s:%s",
148			get_listener_name(listener), errno);
149			return 0;
150			}
151
152			if (setsockopt(listener->fd.fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)))
153			{
154			report_error(L_ALL, "setting SO_REUSEADDR for listener %s:%s",
155			get_listener_name(listener), errno);
156			fd_close(&listener->fd);
157	michael	900	return 0;
158	adx	30	}
159
160			/*
161			* Bind a port to listen for new connections if port is non-null,
162			* else assume it is already open and try get something from it.
163			*/
164			lsin.ss_port = htons(listener->port);
165
166			if (bind(listener->fd.fd, (struct sockaddr *)&lsin, lsin.ss_len))
167			{
168			report_error(L_ALL, "binding listener socket %s:%s",
169			get_listener_name(listener), errno);
170			fd_close(&listener->fd);
171	michael	900	return 0;
172	adx	30	}
173
174			if (listen(listener->fd.fd, HYBRID_SOMAXCONN))
175			{
176			report_error(L_ALL, "listen failed for %s:%s",
177			get_listener_name(listener), errno);
178			fd_close(&listener->fd);
179	michael	900	return 0;
180	adx	30	}
181
182			/* Listen completion events are READ events .. */
183
184			accept_connection(&listener->fd, listener);
185			return 1;
186			}
187
188			static struct Listener *
189			find_listener(int port, struct irc_ssaddr *addr)
190			{
191			dlink_node *ptr;
192			struct Listener *listener = NULL;
193			struct Listener *last_closed = NULL;
194
195			DLINK_FOREACH(ptr, ListenerPollList.head)
196			{
197			listener = ptr->data;
198
199			if ((port == listener->port) &&
200			(!memcmp(addr, &listener->addr, sizeof(struct irc_ssaddr))))
201			{
202			/* Try to return an open listener, otherwise reuse a closed one */
203			if (!listener->fd.flags.open)
204			last_closed = listener;
205			else
206			return (listener);
207			}
208			}
209
210			return (last_closed);
211			}
212
213			/*
214			* add_listener- create a new listener
215			* port - the port number to listen on
216			* vhost_ip - if non-null must contain a valid IP address string in
217			* the format "255.255.255.255"
218			*/
219			void
220			add_listener(int port, const char *vhost_ip, unsigned int flags)
221			{
222			struct Listener *listener;
223			struct irc_ssaddr vaddr;
224			struct addrinfo hints, *res;
225			char portname[PORTNAMELEN + 1];
226			#ifdef IPV6
227			static short int pass = 0; /* if ipv6 and no address specified we need to
228			have two listeners; one for each protocol. */
229			#endif
230
231			/*
232			* if no or invalid port in conf line, don't bother
233			*/
234			if (!(port > 0 && port <= 0xFFFF))
235			return;
236
237			memset(&vaddr, 0, sizeof(vaddr));
238
239			/* Set up the hints structure */
240			memset(&hints, 0, sizeof(hints));
241			hints.ai_family = AF_UNSPEC;
242			hints.ai_socktype = SOCK_STREAM;
243			/* Get us ready for a bind() and don't bother doing dns lookup */
244			hints.ai_flags = AI_PASSIVE \| AI_NUMERICHOST;
245
246			#ifdef IPV6
247			if (ServerInfo.can_use_v6)
248			{
249	michael	1123	snprintf(portname, sizeof(portname), "%d", port);
250			getaddrinfo("::", portname, &hints, &res);
251	adx	30	vaddr.ss.ss_family = AF_INET6;
252			assert(res != NULL);
253
254			memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen);
255			vaddr.ss_port = port;
256			vaddr.ss_len = res->ai_addrlen;
257	michael	1123	freeaddrinfo(res);
258	adx	30	}
259			else
260			#endif
261			{
262			struct sockaddr_in v4 = (struct sockaddr_in) &vaddr;
263			v4->sin_addr.s_addr = INADDR_ANY;
264			vaddr.ss.ss_family = AF_INET;
265			vaddr.ss_len = sizeof(struct sockaddr_in);
266			v4->sin_port = htons(port);
267			}
268
269			snprintf(portname, PORTNAMELEN, "%d", port);
270
271			if (vhost_ip)
272			{
273	michael	1123	if (getaddrinfo(vhost_ip, portname, &hints, &res))
274			return;
275	adx	30
276			assert(res != NULL);
277
278			memcpy((struct sockaddr*)&vaddr, res->ai_addr, res->ai_addrlen);
279			vaddr.ss_port = port;
280			vaddr.ss_len = res->ai_addrlen;
281	michael	1123	freeaddrinfo(res);
282	adx	30	}
283			#ifdef IPV6
284			else if (pass == 0 && ServerInfo.can_use_v6)
285			{
286			/* add the ipv4 listener if we havent already */
287			pass = 1;
288			add_listener(port, "0.0.0.0", flags);
289			}
290			pass = 0;
291			#endif
292
293			if ((listener = find_listener(port, &vaddr)))
294			{
295			listener->flags = flags;
296			if (listener->fd.flags.open)
297			return;
298			}
299			else
300			{
301			listener = make_listener(port, &vaddr);
302			dlinkAdd(listener, &listener->listener_node, &ListenerPollList);
303			listener->flags = flags;
304			}
305
306			if (inetport(listener))
307			listener->active = 1;
308			else
309			close_listener(listener);
310			}
311
312			/*
313			* close_listener - close a single listener
314			*/
315			static void
316			close_listener(struct Listener *listener)
317			{
318			assert(listener != NULL);
319
320			if (listener == NULL)
321			return;
322
323			if (listener->fd.flags.open)
324			fd_close(&listener->fd);
325
326			listener->active = 0;
327
328			if (listener->ref_count)
329			return;
330
331			free_listener(listener);
332			}
333
334			/*
335			* close_listeners - close and free all listeners that are not being used
336			*/
337			void
338			close_listeners(void)
339			{
340	michael	1123	dlink_node ptr = NULL, next_ptr = NULL;
341	adx	30
342			/* close all 'extra' listening ports we have */
343			DLINK_FOREACH_SAFE(ptr, next_ptr, ListenerPollList.head)
344			close_listener(ptr->data);
345			}
346
347			#define TOOFAST_WARNING "ERROR :Trying to reconnect too fast.\r\n"
348			#define DLINE_WARNING "ERROR :You have been D-lined.\r\n"
349
350			static void
351			accept_connection(fde_t pfd, void data)
352			{
353			static time_t last_oper_notice = 0;
354			struct irc_ssaddr addr;
355			int fd;
356			int pe;
357			struct Listener *listener = data;
358
359			memset(&addr, 0, sizeof(addr));
360
361			assert(listener != NULL);
362
363			/* There may be many reasons for error return, but
364			* in otherwise correctly working environment the
365			* probable cause is running out of file descriptors
366			* (EMFILE, ENFILE or others?). The man pages for
367			* accept don't seem to list these as possible,
368			* although it's obvious that it may happen here.
369			* Thus no specific errors are tested at this
370			* point, just assume that connections cannot
371			* be accepted until some old is closed first.
372			*/
373	michael	563	while ((fd = comm_accept(listener, &addr)) != -1)
374	adx	30	{
375			/*
376			* check for connection limit
377			*/
378			if (number_fd > hard_fdlimit - 10)
379			{
380	michael	896	++ServerStats.is_ref;
381	michael	563
382	adx	30	/*
383			* slow down the whining to opers bit
384			*/
385			if ((last_oper_notice + 20) <= CurrentTime)
386			{
387			sendto_realops_flags(UMODE_ALL, L_ALL, "All connections in use. (%s)",
388			get_listener_name(listener));
389			last_oper_notice = CurrentTime;
390			}
391
392			if (!(listener->flags & LISTENER_SSL))
393			send(fd, "ERROR :All connections in use\r\n", 32, 0);
394	michael	1001
395	adx	30	close(fd);
396			break; /* jump out and re-register a new io request */
397			}
398
399	michael	563	/*
400			* Do an initial check we aren't connecting too fast or with too many
401			* from this IP...
402			*/
403			if ((pe = conf_connect_allowed(&addr, addr.ss.ss_family)) != 0)
404	adx	30	{
405	michael	896	++ServerStats.is_ref;
406
407	adx	30	if (!(listener->flags & LISTENER_SSL))
408			switch (pe)
409			{
410			case BANNED_CLIENT:
411			send(fd, DLINE_WARNING, sizeof(DLINE_WARNING)-1, 0);
412			break;
413			case TOO_FAST:
414			send(fd, TOOFAST_WARNING, sizeof(TOOFAST_WARNING)-1, 0);
415			break;
416			}
417
418			close(fd);
419			continue; /* drop the one and keep on clearing the queue */
420			}
421
422	michael	896	++ServerStats.is_ac;
423	michael	549	add_connection(listener, &addr, fd);
424	adx	30	}
425
426			/* Re-register a new IO request for the next accept .. */
427			comm_setselect(&listener->fd, COMM_SELECT_READ, accept_connection,
428			listener, 0);
429			}