[solanum.git] / ircd / listener.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  listener.c: Listens on a port.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  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
 */

#include "stdinc.h"
#include "setup.h"
#include "listener.h"
#include "client.h"
#include "match.h"
#include "ircd.h"
#include "ircd_defs.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "s_stats.h"
#include "send.h"
#include "authd.h"
#include "reject.h"
#include "s_conf.h"
#include "hostmask.h"
#include "sslproc.h"
#include "wsproc.h"
#include "hash.h"
#include "s_assert.h"
#include "logger.h"

#ifndef INADDR_NONE
#define INADDR_NONE ((unsigned int) 0xffffffff)
#endif

#if defined(NO_IN6ADDR_ANY) && defined(RB_IPV6)
static const struct in6_addr in6addr_any =
{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
#endif

static struct Listener *ListenerPollList = NULL;
static int accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data);
static void accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data);

static struct Listener *
make_listener(struct rb_sockaddr_storage *addr)
{
	struct Listener *listener = (struct Listener *) rb_malloc(sizeof(struct Listener));
	s_assert(0 != listener);
	listener->name = me.name;
	listener->F = NULL;

	memcpy(&listener->addr, addr, sizeof(struct rb_sockaddr_storage));
	listener->next = NULL;
	return listener;
}

void
free_listener(struct Listener *listener)
{
	s_assert(NULL != listener);
	if(listener == NULL)
		return;
	/*
	 * remove from listener list
	 */
	if(listener == ListenerPollList)
		ListenerPollList = listener->next;
	else
	{
		struct Listener *prev = ListenerPollList;
		for (; prev; prev = prev->next)
		{
			if(listener == prev->next)
			{
				prev->next = listener->next;
				break;
			}
		}
	}

	/* free */
	rb_free(listener);
}

#define PORTNAMELEN 6		/* ":31337" */

/*
 * get_listener_port - return displayable listener port
 */
static uint16_t
get_listener_port(const struct Listener *listener)
{
	return ntohs(GET_SS_PORT(&listener->addr));
}

/*
 * 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 *listener)
{
	static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4];

	s_assert(NULL != listener);
	if(listener == NULL)
		return NULL;

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

/*
 * show_ports - send port listing to a client
 * inputs       - pointer to client to show ports to
 * output       - none
 * side effects - show ports
 */
void
show_ports(struct Client *source_p)
{
	struct Listener *listener = 0;

	for (listener = ListenerPollList; listener; listener = listener->next)
	{
		sendto_one_numeric(source_p, RPL_STATSPLINE,
			   form_str(RPL_STATSPLINE), 'P',
			   get_listener_port(listener),
			   IsOperAdmin(source_p) ? listener->name : me.name,
			   listener->ref_count, (listener->active) ? "active" : "disabled",
			   listener->ssl ? " ssl" : "");
	}
}

/*
 * 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 CHARYBDIS_SOMAXCONN
 */
#ifdef SOMAXCONN
#undef CHARYBDIS_SOMAXCONN
#define CHARYBDIS_SOMAXCONN SOMAXCONN
#endif

static int
inetport(struct Listener *listener)
{
	rb_fde_t *F;
	int opt = 1;
	const char *errstr;

	/*
	 * At first, open a new socket
	 */

	F = rb_socket(GET_SS_FAMILY(&listener->addr), SOCK_STREAM, 0, "Listener socket");

#ifdef RB_IPV6
	if(GET_SS_FAMILY(&listener->addr) == AF_INET6)
	{
		struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&listener->addr;
		if(!IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &in6addr_any))
		{
			rb_inet_ntop(AF_INET6, &in6->sin6_addr, listener->vhost, sizeof(listener->vhost));
			listener->name = listener->vhost;
		}
	} else
#endif
	{
		struct sockaddr_in *in = (struct sockaddr_in *)&listener->addr;
		if(in->sin_addr.s_addr != INADDR_ANY)
		{
			rb_inet_ntop(AF_INET, &in->sin_addr, listener->vhost, sizeof(listener->vhost));
			listener->name = listener->vhost;
		}
	}

	if(F == NULL)
	{
		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				"Cannot open socket for listener on port %d",
				get_listener_port(listener));
		ilog(L_MAIN, "Cannot open socket for listener %s",
				get_listener_name(listener));
		return 0;
	}
	else if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus*/
	{
		ilog_error("no more connections left for listener");
		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				"No more connections left for listener on port %d",
				get_listener_port(listener));
		ilog(L_MAIN, "No more connections left for listener %s",
				get_listener_name(listener));
		rb_close(F);
		return 0;
	}

	/*
	 * XXX - we don't want to do all this crap for a listener
	 * set_sock_opts(listener);
	 *
	 * FIXME - doesn't this belong in librb? --Elizafox
	 */
	if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt)))
	{
		errstr = strerror(rb_get_sockerr(F));
		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				"Cannot set SO_REUSEADDR for listener on port %d: %s",
				get_listener_port(listener), errstr);
		ilog(L_MAIN, "Cannot set SO_REUSEADDR for listener %s: %s",
				get_listener_name(listener), errstr);
		rb_close(F);
		return 0;
	}

	/* FIXME - doesn't this belong in librb? --Elizafox */
	if(bind(rb_get_fd(F), (struct sockaddr *) &listener->addr, GET_SS_LEN(&listener->addr)))
	{
		errstr = strerror(rb_get_sockerr(F));
		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				"Cannot bind for listener on port %d: %s",
				get_listener_port(listener), errstr);
		ilog(L_MAIN, "Cannot bind for listener %s: %s",
				get_listener_name(listener), errstr);
		rb_close(F);
		return 0;
	}

	if(rb_listen(F, CHARYBDIS_SOMAXCONN, listener->defer_accept))
	{
		errstr = strerror(rb_get_sockerr(F));
		sendto_realops_snomask(SNO_GENERAL, L_ALL,
				"Cannot listen() for listener on port %d: %s",
				get_listener_port(listener), errstr);
		ilog(L_MAIN, "Cannot listen() for listener %s: %s",
				get_listener_name(listener), errstr);
		rb_close(F);
		return 0;
	}

	listener->F = F;

	rb_accept_tcp(listener->F, accept_precallback, accept_callback, listener);
	return 1;
}

static struct Listener *
find_listener(struct rb_sockaddr_storage *addr)
{
	struct Listener *listener = NULL;
	struct Listener *last_closed = NULL;

	for (listener = ListenerPollList; listener; listener = listener->next)
	{
		if(GET_SS_FAMILY(addr) != GET_SS_FAMILY(&listener->addr))
			continue;

		switch(GET_SS_FAMILY(addr))
		{
			case AF_INET:
			{
				struct sockaddr_in *in4 = (struct sockaddr_in *)addr;
				struct sockaddr_in *lin4 = (struct sockaddr_in *)&listener->addr;
				if(in4->sin_addr.s_addr == lin4->sin_addr.s_addr &&
					in4->sin_port == lin4->sin_port )
				{
					if(listener->F == NULL)
						last_closed = listener;
					else
						return(listener);
				}
				break;
			}
#ifdef RB_IPV6
			case AF_INET6:
			{
				struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
				struct sockaddr_in6 *lin6 =(struct sockaddr_in6 *)&listener->addr;
				if(IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &lin6->sin6_addr) &&
				  in6->sin6_port == lin6->sin6_port)
				{
					if(listener->F == NULL)
						last_closed = listener;
					else
						return(listener);
				}
				break;

			}
#endif

			default:
				break;
		}
	}
	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, int family, int ssl, int defer_accept, int wsock)
{
	struct Listener *listener;
	struct rb_sockaddr_storage vaddr;

	/*
	 * if no port in conf line, don't bother
	 */
	if(port == 0)
		return;
	memset(&vaddr, 0, sizeof(vaddr));
	SET_SS_FAMILY(&vaddr, family);

	if(vhost_ip != NULL)
	{
		if(family == AF_INET)
		{
			if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in *)&vaddr)->sin_addr) <= 0)
				return;
		}
#ifdef RB_IPV6
		else
		{
			if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in6 *)&vaddr)->sin6_addr) <= 0)
				return;

		}
#endif
	} else
	{
		switch(family)
		{
			case AF_INET:
				((struct sockaddr_in *)&vaddr)->sin_addr.s_addr = INADDR_ANY;
				break;
#ifdef RB_IPV6
			case AF_INET6:
				memcpy(&((struct sockaddr_in6 *)&vaddr)->sin6_addr, &in6addr_any, sizeof(struct in6_addr));
				break;
			default:
				return;
#endif
		}
	}
	switch(family)
	{
		case AF_INET:
			SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in));
			SET_SS_FAMILY(&vaddr, AF_INET);
			SET_SS_PORT(&vaddr, htons(port));
			break;
#ifdef RB_IPV6
		case AF_INET6:
			SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in6));
			SET_SS_FAMILY(&vaddr, AF_INET6);
			SET_SS_PORT(&vaddr, htons(port));
			break;
#endif
		default:
			break;
	}
	if((listener = find_listener(&vaddr)))
	{
		if(listener->F != NULL)
			return;
	}
	else
	{
		listener = make_listener(&vaddr);
		listener->next = ListenerPollList;
		ListenerPollList = listener;
	}

	listener->F = NULL;
	listener->ssl = ssl;
	listener->defer_accept = defer_accept;
	listener->wsock = wsock;

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

/*
 * close_listener - close a single listener
 */
void
close_listener(struct Listener *listener)
{
	s_assert(listener != NULL);
	if(listener == NULL)
		return;
	if(listener->F != NULL)
	{
		rb_close(listener->F);
		listener->F = NULL;
	}

	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()
{
	struct Listener *listener;
	struct Listener *listener_next = 0;
	/*
	 * close all 'extra' listening ports we have
	 */
	for (listener = ListenerPollList; listener; listener = listener_next)
	{
		listener_next = listener->next;
		close_listener(listener);
	}
}

#define DLINE_WARNING "ERROR :You have been D-lined.\r\n"

/*
 * add_connection - creates a client which has just connected to us on
 * the given fd. The sockhost field is initialized with the ip# of the host.
 * The client is sent to the auth module for verification, and not put in
 * any client list yet.
 */
static void
add_connection(struct Listener *listener, rb_fde_t *F, struct sockaddr *sai, struct sockaddr *lai)
{
	struct Client *new_client;
	s_assert(NULL != listener);

	/*
	 * get the client socket name from the socket
	 * the client has already been checked out in accept_connection
	 */
	new_client = make_client(NULL);

	if (listener->ssl)
	{
		rb_fde_t *xF[2];
		if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming ssld Connection") == -1)
		{
			free_client(new_client);
			return;
		}
		new_client->localClient->ssl_ctl = start_ssld_accept(F, xF[1], connid_get(new_client));        /* this will close F for us */
		if(new_client->localClient->ssl_ctl == NULL)
		{
			free_client(new_client);
			return;
		}
		F = xF[0];
		SetSSL(new_client);
	}

	if (listener->wsock)
	{
		rb_fde_t *xF[2];
		if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming wsockd Connection") == -1)
		{
			free_client(new_client);
			return;
		}
		new_client->localClient->ws_ctl = start_wsockd_accept(F, xF[1], connid_get(new_client));        /* this will close F for us */
		if(new_client->localClient->ws_ctl == NULL)
		{
			free_client(new_client);
			return;
		}
		F = xF[0];
	}

	memcpy(&new_client->localClient->ip, sai, sizeof(struct rb_sockaddr_storage));
	memcpy(&new_client->preClient->lip, lai, sizeof(struct rb_sockaddr_storage));

	/*
	 * copy address to 'sockhost' as a string, copy it to host too
	 * so we have something valid to put into error messages...
	 */
	rb_inet_ntop_sock((struct sockaddr *)&new_client->localClient->ip, new_client->sockhost,
		sizeof(new_client->sockhost));


	rb_strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));

	new_client->localClient->F = F;
	new_client->localClient->listener = listener;

	++listener->ref_count;

	authd_initiate_client(new_client);
}

static const char *toofast = "ERROR :Reconnecting too fast, throttled.\r\n";

static int
accept_precallback(rb_fde_t *F, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
{
	struct Listener *listener = (struct Listener *)data;
	char buf[BUFSIZE];
	struct ConfItem *aconf;
	static time_t last_oper_notice = 0;
	int len;

	if(listener->ssl && (!ircd_ssl_ok || !get_ssld_count()))
	{
		rb_close(F);
		return 0;
	}

	if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus */
	{
		++ServerStats.is_ref;
		/*
		 * slow down the whining to opers bit
		 */
		if((last_oper_notice + 20) <= rb_current_time())
		{
			sendto_realops_snomask(SNO_GENERAL, L_ALL,
					     "All connections in use. (%s)",
					     get_listener_name(listener));
			last_oper_notice = rb_current_time();
		}

		rb_write(F, "ERROR :All connections in use\r\n", 31);
		rb_close(F);
		return 0;
	}

	aconf = find_dline(addr, addr->sa_family);
	if(aconf != NULL && (aconf->status & CONF_EXEMPTDLINE))
		return 1;

	/* Do an initial check we aren't connecting too fast or with too many
	 * from this IP... */
	if(aconf != NULL)
	{
		ServerStats.is_ref++;

		if(ConfigFileEntry.dline_with_reason)
		{
			len = snprintf(buf, sizeof(buf), "ERROR :*** Banned: %s\r\n", get_user_ban_reason(aconf));
			if (len >= (int)(sizeof(buf)-1))
			{
				buf[sizeof(buf) - 3] = '\r';
				buf[sizeof(buf) - 2] = '\n';
				buf[sizeof(buf) - 1] = '\0';
			}
		}
		else
			strcpy(buf, "ERROR :You have been D-lined.\r\n");

		rb_write(F, buf, strlen(buf));
		rb_close(F);
		return 0;
	}

	if(check_reject(F, addr))
		return 0;

	if(throttle_add(addr))
	{
		rb_write(F, toofast, strlen(toofast));
		rb_close(F);
		return 0;
	}

	return 1;
}

static void
accept_callback(rb_fde_t *F, int status, struct sockaddr *addr, rb_socklen_t addrlen, void *data)
{
	struct Listener *listener = data;
	struct rb_sockaddr_storage lip;
	unsigned int locallen = sizeof(struct rb_sockaddr_storage);

	ServerStats.is_ac++;

	if(getsockname(rb_get_fd(F), (struct sockaddr *) &lip, &locallen) < 0)
	{
		/* this can fail if the connection disappeared in the meantime */
		rb_close(F);
		return;
	}

	add_connection(listener, F, addr, (struct sockaddr *)&lip);
}
Commit	Line	Data
54ac8b60 VY	1	/*
	2	* ircd-ratbox: A slightly useful ircd.
	3	* listener.c: Listens on a port.
	4	*
	5	* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
	6	* Copyright (C) 1996-2002 Hybrid Development Team
	7	* Copyright (C) 2002-2005 ircd-ratbox development team
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	22	* USA
54ac8b60 VY	23	*/
	24
	25	#include "stdinc.h"
	26	#include "setup.h"
	27	#include "listener.h"
	28	#include "client.h"
4562c604	29	#include "match.h"
54ac8b60 VY	30	#include "ircd.h"
	31	#include "ircd_defs.h"
	32	#include "numeric.h"
	33	#include "s_conf.h"
	34	#include "s_newconf.h"
	35	#include "s_stats.h"
	36	#include "send.h"
d3f6b808	37	#include "authd.h"
54ac8b60 VY	38	#include "reject.h"
	39	#include "s_conf.h"
	40	#include "hostmask.h"
c6d72037	41	#include "sslproc.h"
c53ca1e0	42	#include "wsproc.h"
c6d72037	43	#include "hash.h"
77d3d2db KB	44	#include "s_assert.h"
77d3d2db KB	45	#include "logger.h"
54ac8b60 VY	46
	47	#ifndef INADDR_NONE
	48	#define INADDR_NONE ((unsigned int) 0xffffffff)
	49	#endif
	50
9ea3ea10	51	#if defined(NO_IN6ADDR_ANY) && defined(RB_IPV6)
54ac8b60 VY	52	static const struct in6_addr in6addr_any =
54ac8b60 VY	53	{ { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } };
55abcbb2	54	#endif
54ac8b60	55
8f103562	56	static struct Listener *ListenerPollList = NULL;
1087485c	57	static int accept_precallback(rb_fde_t F, struct sockaddr addr, rb_socklen_t addrlen, void *data);
8e09c4a2	58	static void accept_callback(rb_fde_t F, int status, struct sockaddr addr, rb_socklen_t addrlen, void *data);
54ac8b60	59
8f103562	60	static struct Listener *
e7046ee5	61	make_listener(struct rb_sockaddr_storage *addr)
54ac8b60	62	{
8f103562	63	struct Listener listener = (struct Listener ) rb_malloc(sizeof(struct Listener));
54ac8b60	64	s_assert(0 != listener);
54ac8b60	65	listener->name = me.name;
f691939a VY	66	listener->F = NULL;
f691939a VY	67
e7046ee5	68	memcpy(&listener->addr, addr, sizeof(struct rb_sockaddr_storage));
54ac8b60 VY	69	listener->next = NULL;
	70	return listener;
	71	}
	72
	73	void
8f103562	74	free_listener(struct Listener *listener)
54ac8b60 VY	75	{
	76	s_assert(NULL != listener);
	77	if(listener == NULL)
	78	return;
	79	/*
	80	* remove from listener list
	81	*/
	82	if(listener == ListenerPollList)
	83	ListenerPollList = listener->next;
	84	else
	85	{
8f103562	86	struct Listener *prev = ListenerPollList;
54ac8b60 VY	87	for (; prev; prev = prev->next)
	88	{
	89	if(listener == prev->next)
	90	{
	91	prev->next = listener->next;
	92	break;
	93	}
	94	}
	95	}
	96
	97	/* free */
	98	rb_free(listener);
	99	}
	100
	101	#define PORTNAMELEN 6 /* ":31337" */
	102
40173bcb JT	103	/*
	104	* get_listener_port - return displayable listener port
	105	*/
	106	static uint16_t
	107	get_listener_port(const struct Listener *listener)
	108	{
d86692fa	109	return ntohs(GET_SS_PORT(&listener->addr));
40173bcb JT	110	}
40173bcb JT	111
54ac8b60 VY	112	/*
	113	* get_listener_name - return displayable listener name and port
	114	* returns "host.foo.org:6667" for a given listener
	115	*/
	116	const char *
8f103562	117	get_listener_name(const struct Listener *listener)
54ac8b60 VY	118	{
54ac8b60 VY	119	static char buf[HOSTLEN + HOSTLEN + PORTNAMELEN + 4];
54ac8b60 VY	120
	121	s_assert(NULL != listener);
	122	if(listener == NULL)
	123	return NULL;
	124
5203cba5	125	snprintf(buf, sizeof(buf), "%s[%s/%u]",
40173bcb	126	me.name, listener->name, get_listener_port(listener));
54ac8b60 VY	127	return buf;
	128	}
	129
	130	/*
	131	* show_ports - send port listing to a client
	132	* inputs - pointer to client to show ports to
	133	* output - none
	134	* side effects - show ports
	135	*/
	136	void
	137	show_ports(struct Client *source_p)
	138	{
8f103562	139	struct Listener *listener = 0;
54ac8b60 VY	140
	141	for (listener = ListenerPollList; listener; listener = listener->next)
	142	{
55abcbb2	143	sendto_one_numeric(source_p, RPL_STATSPLINE,
40173bcb JT	144	form_str(RPL_STATSPLINE), 'P',
40173bcb JT	145	get_listener_port(listener),
54ac8b60	146	IsOperAdmin(source_p) ? listener->name : me.name,
8bd5767b	147	listener->ref_count, (listener->active) ? "active" : "disabled",
c6d72037	148	listener->ssl ? " ssl" : "");
54ac8b60 VY	149	}
	150	}
	151
	152	/*
	153	* inetport - create a listener socket in the AF_INET or AF_INET6 domain,
	154	* bind it to the port given in 'port' and listen to it
	155	* returns true (1) if successful false (0) on error.
	156	*
	157	* If the operating system has a define for SOMAXCONN, use it, otherwise
638d2862	158	* use CHARYBDIS_SOMAXCONN
54ac8b60 VY	159	*/
54ac8b60 VY	160	#ifdef SOMAXCONN
638d2862 EM	161	#undef CHARYBDIS_SOMAXCONN
638d2862 EM	162	#define CHARYBDIS_SOMAXCONN SOMAXCONN
54ac8b60 VY	163	#endif
	164
	165	static int
8f103562	166	inetport(struct Listener *listener)
54ac8b60	167	{
f691939a	168	rb_fde_t *F;
54ac8b60	169	int opt = 1;
40173bcb	170	const char *errstr;
54ac8b60 VY	171
	172	/*
	173	* At first, open a new socket
	174	*/
55abcbb2	175
f691939a	176	F = rb_socket(GET_SS_FAMILY(&listener->addr), SOCK_STREAM, 0, "Listener socket");
54ac8b60	177
9ea3ea10	178	#ifdef RB_IPV6
e867208d	179	if(GET_SS_FAMILY(&listener->addr) == AF_INET6)
54ac8b60 VY	180	{
	181	struct sockaddr_in6 in6 = (struct sockaddr_in6 )&listener->addr;
	182	if(!IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &in6addr_any))
	183	{
caa4d9d2	184	rb_inet_ntop(AF_INET6, &in6->sin6_addr, listener->vhost, sizeof(listener->vhost));
54ac8b60 VY	185	listener->name = listener->vhost;
	186	}
	187	} else
	188	#endif
	189	{
	190	struct sockaddr_in in = (struct sockaddr_in )&listener->addr;
	191	if(in->sin_addr.s_addr != INADDR_ANY)
	192	{
caa4d9d2	193	rb_inet_ntop(AF_INET, &in->sin_addr, listener->vhost, sizeof(listener->vhost));
54ac8b60	194	listener->name = listener->vhost;
55abcbb2	195	}
54ac8b60 VY	196	}
54ac8b60 VY	197
1087485c JT	198	if(F == NULL)
1087485c JT	199	{
40173bcb JT	200	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	201	"Cannot open socket for listener on port %d",
	202	get_listener_port(listener));
	203	ilog(L_MAIN, "Cannot open socket for listener %s",
	204	get_listener_name(listener));
1087485c JT	205	return 0;
	206	}
	207	else if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus*/
	208	{
825ddf13	209	ilog_error("no more connections left for listener");
40173bcb JT	210	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	211	"No more connections left for listener on port %d",
	212	get_listener_port(listener));
	213	ilog(L_MAIN, "No more connections left for listener %s",
	214	get_listener_name(listener));
1087485c JT	215	rb_close(F);
1087485c JT	216	return 0;
54ac8b60 VY	217	}
54ac8b60 VY	218
1087485c JT	219	/*
	220	* XXX - we don't want to do all this crap for a listener
	221	* set_sock_opts(listener);
bf3ecca2 EM	222	*
bf3ecca2 EM	223	* FIXME - doesn't this belong in librb? --Elizafox
1087485c JT	224	*/
	225	if(setsockopt(rb_get_fd(F), SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt)))
	226	{
40173bcb JT	227	errstr = strerror(rb_get_sockerr(F));
	228	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	229	"Cannot set SO_REUSEADDR for listener on port %d: %s",
	230	get_listener_port(listener), errstr);
	231	ilog(L_MAIN, "Cannot set SO_REUSEADDR for listener %s: %s",
	232	get_listener_name(listener), errstr);
1087485c JT	233	rb_close(F);
1087485c JT	234	return 0;
54ac8b60 VY	235	}
54ac8b60 VY	236
bf3ecca2	237	/* FIXME - doesn't this belong in librb? --Elizafox */
1087485c JT	238	if(bind(rb_get_fd(F), (struct sockaddr *) &listener->addr, GET_SS_LEN(&listener->addr)))
1087485c JT	239	{
40173bcb JT	240	errstr = strerror(rb_get_sockerr(F));
	241	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	242	"Cannot bind for listener on port %d: %s",
	243	get_listener_port(listener), errstr);
	244	ilog(L_MAIN, "Cannot bind for listener %s: %s",
	245	get_listener_name(listener), errstr);
1087485c JT	246	rb_close(F);
1087485c JT	247	return 0;
54ac8b60 VY	248	}
54ac8b60 VY	249
638d2862	250	if(rb_listen(F, CHARYBDIS_SOMAXCONN, listener->defer_accept))
1087485c	251	{
40173bcb JT	252	errstr = strerror(rb_get_sockerr(F));
	253	sendto_realops_snomask(SNO_GENERAL, L_ALL,
	254	"Cannot listen() for listener on port %d: %s",
	255	get_listener_port(listener), errstr);
	256	ilog(L_MAIN, "Cannot listen() for listener %s: %s",
	257	get_listener_name(listener), errstr);
1087485c JT	258	rb_close(F);
1087485c JT	259	return 0;
54ac8b60 VY	260	}
54ac8b60 VY	261
1087485c JT	262	listener->F = F;
1087485c JT	263
f691939a	264	rb_accept_tcp(listener->F, accept_precallback, accept_callback, listener);
54ac8b60 VY	265	return 1;
	266	}
	267
8f103562	268	static struct Listener *
e7046ee5	269	find_listener(struct rb_sockaddr_storage *addr)
54ac8b60	270	{
8f103562 JT	271	struct Listener *listener = NULL;
8f103562 JT	272	struct Listener *last_closed = NULL;
54ac8b60 VY	273
	274	for (listener = ListenerPollList; listener; listener = listener->next)
	275	{
e867208d	276	if(GET_SS_FAMILY(addr) != GET_SS_FAMILY(&listener->addr))
54ac8b60	277	continue;
55abcbb2	278
a7fb2693	279	switch(GET_SS_FAMILY(addr))
54ac8b60 VY	280	{
	281	case AF_INET:
	282	{
	283	struct sockaddr_in in4 = (struct sockaddr_in )addr;
	284	struct sockaddr_in lin4 = (struct sockaddr_in )&listener->addr;
55abcbb2	285	if(in4->sin_addr.s_addr == lin4->sin_addr.s_addr &&
54ac8b60 VY	286	in4->sin_port == lin4->sin_port )
54ac8b60 VY	287	{
1087485c JT	288	if(listener->F == NULL)
	289	last_closed = listener;
	290	else
54ac8b60 VY	291	return(listener);
	292	}
	293	break;
	294	}
9ea3ea10	295	#ifdef RB_IPV6
54ac8b60 VY	296	case AF_INET6:
	297	{
	298	struct sockaddr_in6 in6 = (struct sockaddr_in6 )addr;
	299	struct sockaddr_in6 lin6 =(struct sockaddr_in6 )&listener->addr;
	300	if(IN6_ARE_ADDR_EQUAL(&in6->sin6_addr, &lin6->sin6_addr) &&
	301	in6->sin6_port == lin6->sin6_port)
	302	{
1087485c JT	303	if(listener->F == NULL)
	304	last_closed = listener;
	305	else
54ac8b60 VY	306	return(listener);
	307	}
	308	break;
55abcbb2	309
54ac8b60 VY	310	}
	311	#endif
	312
	313	default:
	314	break;
	315	}
	316	}
	317	return last_closed;
	318	}
	319
	320
	321	/*
	322	* add_listener- create a new listener
	323	* port - the port number to listen on
	324	* vhost_ip - if non-null must contain a valid IP address string in
	325	* the format "255.255.255.255"
	326	*/
	327	void
c53ca1e0	328	add_listener(int port, const char *vhost_ip, int family, int ssl, int defer_accept, int wsock)
54ac8b60	329	{
8f103562	330	struct Listener *listener;
e7046ee5	331	struct rb_sockaddr_storage vaddr;
54ac8b60 VY	332
	333	/*
	334	* if no port in conf line, don't bother
	335	*/
	336	if(port == 0)
	337	return;
	338	memset(&vaddr, 0, sizeof(vaddr));
e867208d	339	SET_SS_FAMILY(&vaddr, family);
54ac8b60 VY	340
	341	if(vhost_ip != NULL)
	342	{
	343	if(family == AF_INET)
	344	{
caa4d9d2	345	if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in *)&vaddr)->sin_addr) <= 0)
54ac8b60	346	return;
55abcbb2	347	}
9ea3ea10	348	#ifdef RB_IPV6
54ac8b60 VY	349	else
54ac8b60 VY	350	{
caa4d9d2	351	if(rb_inet_pton(family, vhost_ip, &((struct sockaddr_in6 *)&vaddr)->sin6_addr) <= 0)
54ac8b60	352	return;
55abcbb2	353
54ac8b60 VY	354	}
	355	#endif
	356	} else
	357	{
	358	switch(family)
	359	{
	360	case AF_INET:
	361	((struct sockaddr_in *)&vaddr)->sin_addr.s_addr = INADDR_ANY;
	362	break;
9ea3ea10	363	#ifdef RB_IPV6
54ac8b60 VY	364	case AF_INET6:
	365	memcpy(&((struct sockaddr_in6 *)&vaddr)->sin6_addr, &in6addr_any, sizeof(struct in6_addr));
	366	break;
	367	default:
	368	return;
	369	#endif
55abcbb2	370	}
54ac8b60 VY	371	}
	372	switch(family)
	373	{
	374	case AF_INET:
99c4835f	375	SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in));
d86692fa EM	376	SET_SS_FAMILY(&vaddr, AF_INET);
d86692fa EM	377	SET_SS_PORT(&vaddr, htons(port));
54ac8b60	378	break;
9ea3ea10	379	#ifdef RB_IPV6
54ac8b60	380	case AF_INET6:
99c4835f	381	SET_SS_LEN(&vaddr, sizeof(struct sockaddr_in6));
d86692fa EM	382	SET_SS_FAMILY(&vaddr, AF_INET6);
d86692fa EM	383	SET_SS_PORT(&vaddr, htons(port));
54ac8b60 VY	384	break;
	385	#endif
	386	default:
	387	break;
	388	}
	389	if((listener = find_listener(&vaddr)))
	390	{
1087485c	391	if(listener->F != NULL)
54ac8b60 VY	392	return;
	393	}
	394	else
	395	{
	396	listener = make_listener(&vaddr);
	397	listener->next = ListenerPollList;
	398	ListenerPollList = listener;
	399	}
	400
f691939a	401	listener->F = NULL;
c6d72037	402	listener->ssl = ssl;
02270e96	403	listener->defer_accept = defer_accept;
c53ca1e0	404	listener->wsock = wsock;
54ac8b60 VY	405
	406	if(inetport(listener))
	407	listener->active = 1;
	408	else
	409	close_listener(listener);
	410	}
	411
	412	/*
	413	* close_listener - close a single listener
	414	*/
	415	void
8f103562	416	close_listener(struct Listener *listener)
54ac8b60 VY	417	{
	418	s_assert(listener != NULL);
	419	if(listener == NULL)
	420	return;
1087485c JT	421	if(listener->F != NULL)
	422	{
	423	rb_close(listener->F);
	424	listener->F = NULL;
54ac8b60 VY	425	}
	426
	427	listener->active = 0;
	428
	429	if(listener->ref_count)
	430	return;
	431
	432	free_listener(listener);
	433	}
	434
	435	/*
	436	* close_listeners - close and free all listeners that are not being used
	437	*/
	438	void
	439	close_listeners()
	440	{
8f103562 JT	441	struct Listener *listener;
8f103562 JT	442	struct Listener *listener_next = 0;
54ac8b60 VY	443	/*
	444	* close all 'extra' listening ports we have
	445	*/
	446	for (listener = ListenerPollList; listener; listener = listener_next)
	447	{
	448	listener_next = listener->next;
	449	close_listener(listener);
	450	}
	451	}
	452
	453	#define DLINE_WARNING "ERROR :You have been D-lined.\r\n"
	454
	455	/*
55abcbb2	456	* add_connection - creates a client which has just connected to us on
54ac8b60 VY	457	* the given fd. The sockhost field is initialized with the ip# of the host.
	458	* The client is sent to the auth module for verification, and not put in
	459	* any client list yet.
	460	*/
1087485c	461	static void
b5b4a0e7	462	add_connection(struct Listener listener, rb_fde_t F, struct sockaddr sai, struct sockaddr lai)
54ac8b60 VY	463	{
	464	struct Client *new_client;
	465	s_assert(NULL != listener);
	466
55abcbb2	467	/*
54ac8b60 VY	468	* get the client socket name from the socket
	469	* the client has already been checked out in accept_connection
	470	*/
	471	new_client = make_client(NULL);
	472
b5b4a0e7 AC	473	if (listener->ssl)
	474	{
	475	rb_fde_t *xF[2];
	476	if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming ssld Connection") == -1)
	477	{
	478	free_client(new_client);
	479	return;
	480	}
de7cf7e0	481	new_client->localClient->ssl_ctl = start_ssld_accept(F, xF[1], connid_get(new_client)); /* this will close F for us */
b5b4a0e7 AC	482	if(new_client->localClient->ssl_ctl == NULL)
	483	{
	484	free_client(new_client);
	485	return;
	486	}
	487	F = xF[0];
	488	SetSSL(new_client);
	489	}
	490
c53ca1e0 AC	491	if (listener->wsock)
	492	{
	493	rb_fde_t *xF[2];
	494	if(rb_socketpair(AF_UNIX, SOCK_STREAM, 0, &xF[0], &xF[1], "Incoming wsockd Connection") == -1)
	495	{
	496	free_client(new_client);
	497	return;
	498	}
	499	new_client->localClient->ws_ctl = start_wsockd_accept(F, xF[1], connid_get(new_client)); /* this will close F for us */
	500	if(new_client->localClient->ws_ctl == NULL)
	501	{
	502	free_client(new_client);
	503	return;
	504	}
	505	F = xF[0];
	506	}
	507
e7046ee5	508	memcpy(&new_client->localClient->ip, sai, sizeof(struct rb_sockaddr_storage));
3540120a	509	memcpy(&new_client->preClient->lip, lai, sizeof(struct rb_sockaddr_storage));
54ac8b60	510
55abcbb2	511	/*
54ac8b60 VY	512	* copy address to 'sockhost' as a string, copy it to host too
	513	* so we have something valid to put into error messages...
	514	*/
55abcbb2	515	rb_inet_ntop_sock((struct sockaddr *)&new_client->localClient->ip, new_client->sockhost,
54ac8b60 VY	516	sizeof(new_client->sockhost));
	517
	518
f427c8b0	519	rb_strlcpy(new_client->host, new_client->sockhost, sizeof(new_client->host));
54ac8b60	520
99c4835f	521	new_client->localClient->F = F;
54ac8b60	522	new_client->localClient->listener = listener;
c6d72037	523
54ac8b60 VY	524	++listener->ref_count;
54ac8b60 VY	525
d3f6b808	526	authd_initiate_client(new_client);
54ac8b60	527	}
0d89d5cd	528
43946961 JT	529	static const char *toofast = "ERROR :Reconnecting too fast, throttled.\r\n";
43946961 JT	530
1087485c JT	531	static int
	532	accept_precallback(rb_fde_t F, struct sockaddr addr, rb_socklen_t addrlen, void *data)
	533	{
	534	struct Listener listener = (struct Listener )data;
	535	char buf[BUFSIZE];
	536	struct ConfItem *aconf;
	537	static time_t last_oper_notice = 0;
b52c2949	538	int len;
1087485c	539
bfc44622	540	if(listener->ssl && (!ircd_ssl_ok \|\| !get_ssld_count()))
8bd5767b JT	541	{
	542	rb_close(F);
	543	return 0;
c6d72037 VY	544	}
c6d72037 VY	545
1087485c JT	546	if((maxconnections - 10) < rb_get_fd(F)) /* XXX this is kinda bogus */
1087485c JT	547	{
47adde3d	548	++ServerStats.is_ref;
1087485c JT	549	/*
	550	* slow down the whining to opers bit
	551	*/
	552	if((last_oper_notice + 20) <= rb_current_time())
	553	{
26716d6d	554	sendto_realops_snomask(SNO_GENERAL, L_ALL,
1087485c JT	555	"All connections in use. (%s)",
	556	get_listener_name(listener));
	557	last_oper_notice = rb_current_time();
	558	}
55abcbb2	559
76d82c19	560	rb_write(F, "ERROR :All connections in use\r\n", 31);
1087485c	561	rb_close(F);
1087485c JT	562	return 0;
	563	}
	564
41d7fefa	565	aconf = find_dline(addr, addr->sa_family);
1087485c JT	566	if(aconf != NULL && (aconf->status & CONF_EXEMPTDLINE))
1087485c JT	567	return 1;
55abcbb2	568
1087485c JT	569	/* Do an initial check we aren't connecting too fast or with too many
	570	* from this IP... */
	571	if(aconf != NULL)
	572	{
47adde3d	573	ServerStats.is_ref++;
55abcbb2	574
1087485c JT	575	if(ConfigFileEntry.dline_with_reason)
1087485c JT	576	{
5203cba5	577	len = snprintf(buf, sizeof(buf), "ERROR :*** Banned: %s\r\n", get_user_ban_reason(aconf));
b52c2949	578	if (len >= (int)(sizeof(buf)-1))
1087485c JT	579	{
	580	buf[sizeof(buf) - 3] = '\r';
	581	buf[sizeof(buf) - 2] = '\n';
	582	buf[sizeof(buf) - 1] = '\0';
	583	}
	584	}
	585	else
	586	strcpy(buf, "ERROR :You have been D-lined.\r\n");
55abcbb2	587
1087485c JT	588	rb_write(F, buf, strlen(buf));
	589	rb_close(F);
	590	return 0;
	591	}
	592
43946961 JT	593	if(check_reject(F, addr))
43946961 JT	594	return 0;
55abcbb2	595
43946961 JT	596	if(throttle_add(addr))
	597	{
	598	rb_write(F, toofast, strlen(toofast));
	599	rb_close(F);
	600	return 0;
	601	}
	602
1087485c JT	603	return 1;
	604	}
	605
	606	static void
	607	accept_callback(rb_fde_t F, int status, struct sockaddr addr, rb_socklen_t addrlen, void *data)
	608	{
	609	struct Listener *listener = data;
	610	struct rb_sockaddr_storage lip;
	611	unsigned int locallen = sizeof(struct rb_sockaddr_storage);
55abcbb2	612
47adde3d	613	ServerStats.is_ac++;
1087485c JT	614
	615	if(getsockname(rb_get_fd(F), (struct sockaddr *) &lip, &locallen) < 0)
	616	{
d60a42a2	617	/* this can fail if the connection disappeared in the meantime */
1087485c	618	rb_close(F);
9692f954	619	return;
1087485c	620	}
55abcbb2	621
b5b4a0e7	622	add_connection(listener, F, addr, (struct sockaddr *)&lip);
0d89d5cd	623	}