ngircd-tor/src/ngircd/conn.c

/*
 * ngIRCd -- The Next Generation IRC Daemon
 * Copyright (c)2001-2005 Alexander Barton <alex@barton.de>
 *
 * 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.
 * Please read the file COPYING, README and AUTHORS for more information.
 *
 * Connection management
 */


#define CONN_MODULE

#include "portab.h"
#include "io.h"

static char UNUSED id[] = "$Id: conn.c,v 1.180 2005/09/11 11:42:48 fw Exp $";

#include "imp.h"
#include <assert.h>
#ifdef PROTOTYPES
#	include <stdarg.h>
#else
#	include <varargs.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <netinet/in.h>

#ifdef HAVE_NETINET_IP_H
# include <netinet/ip.h>
#endif

#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#else
# define PF_INET AF_INET
#endif

#ifdef HAVE_STDINT_H
# include <stdint.h>			/* e.g. for Mac OS X */
#endif

#ifdef TCPWRAP
# include <tcpd.h>			/* for TCP Wrappers */
#endif

#include "array.h"
#include "defines.h"
#include "resolve.h"

#include "exp.h"
#include "conn.h"

#include "imp.h"
#include "ngircd.h"
#include "client.h"
#include "conf.h"
#include "conn-zip.h"
#include "conn-func.h"
#include "log.h"
#include "parse.h"
#include "tool.h"

#ifdef ZEROCONF
# include "rendezvous.h"
#endif

#include "exp.h"


#define SERVER_WAIT (NONE - 1)


static bool Handle_Write PARAMS(( CONN_ID Idx ));
static int New_Connection PARAMS(( int Sock ));
static CONN_ID Socket2Index PARAMS(( int Sock ));
static void Read_Request PARAMS(( CONN_ID Idx ));
static bool Handle_Buffer PARAMS(( CONN_ID Idx ));
static void Check_Connections PARAMS(( void ));
static void Check_Servers PARAMS(( void ));
static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
static bool Init_Socket PARAMS(( int Sock ));
static void New_Server PARAMS(( int Server, CONN_ID Idx ));
static void Simple_Message PARAMS(( int Sock, char *Msg ));
static int Count_Connections PARAMS(( struct sockaddr_in addr ));
static int NewListener PARAMS(( const UINT16 Port ));

static array My_Listeners;

#ifdef TCPWRAP
int allow_severity = LOG_INFO;
int deny_severity = LOG_ERR;
#endif

static void server_login PARAMS((CONN_ID idx));

static void cb_clientserver PARAMS((int sock, short what));

static void
cb_listen(int sock, short irrelevant)
{
	(void) irrelevant;
	New_Connection( sock );
}


static void
cb_connserver(int sock, UNUSED short what)
{
	int res, err;
	socklen_t sock_len;
	CLIENT *c;
	CONN_ID idx = Socket2Index( sock );
	if (idx <= NONE) {
#ifdef DEBUG
		Log(LOG_DEBUG, "cb_connserver wants to write on unknown socket?!");
#endif
		io_close(sock);
		return;
	}

	assert( what & IO_WANTWRITE);

	/* connect() finished, get result. */
	sock_len = sizeof( err );
	res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
	assert( sock_len == sizeof( err ));

	/* Fehler aufgetreten? */
	if(( res != 0 ) || ( err != 0 )) {
		if ( res != 0 ) 
			Log( LOG_CRIT, "getsockopt (connection %d): %s!", idx, strerror( errno ));
		else
			Log( LOG_CRIT, "Can't connect socket to \"%s:%d\" (connection %d): %s!",
				My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port,
										idx, strerror( err ));

			/* Clean up socket, connection and client structures */
			c = Client_GetFromConn( idx );
			if( c ) Client_DestroyNow( c );
			io_close( My_Connections[idx].sock );
			Init_Conn_Struct( idx );

			/* Bei Server-Verbindungen lasttry-Zeitpunkt auf "jetzt" setzen */
			Conf_Server[Conf_GetServer( idx )].lasttry = time( NULL );
			Conf_UnsetServer( idx );
			return;
	}

	Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
	server_login(idx);
}


static void
server_login(CONN_ID idx)
{
	Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
			My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );

	io_event_setcb( My_Connections[idx].sock, cb_clientserver);
	io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);

	/* Send PASS and SERVER command to peer */
	Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
	Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
}


static void
cb_clientserver(int sock, short what)
{
	CONN_ID idx = Socket2Index( sock );
	if (idx <= NONE) {
#ifdef DEBUG
		Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
#endif
		io_close(sock);
		return;
	}

	if (what & IO_WANTREAD)
		Read_Request( idx );

	if (what & IO_WANTWRITE)
		Handle_Write( idx );
}


static void
FreeRes_stat( CONNECTION *c )
{
	assert( c != NULL );
	assert( c->res_stat != NULL );

	if (!c->res_stat) return;

	io_close( c->res_stat->pipe[0] );

	array_free(&c->res_stat->buffer);
	free( c->res_stat );
	c->res_stat = NULL;
}


GLOBAL void
Conn_Init( void )
{
	/* Modul initialisieren: statische Strukturen "ausnullen". */

	CONN_ID i;

	/* Speicher fuer Verbindungs-Pool anfordern */
	Pool_Size = CONNECTION_POOL;
	if( Conf_MaxConnections > 0 )
	{
		/* konfiguriertes Limit beachten */
		if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
	}
	My_Connections = (CONNECTION *) calloc( Pool_Size,  sizeof( CONNECTION ) );
	if( ! My_Connections )
	{
		/* Speicher konnte nicht alloziert werden! */
		Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
		exit( 1 );
	}
#ifdef DEBUG
	Log( LOG_DEBUG, "Allocated connection pool for %d items (%ld bytes).", Pool_Size, sizeof( CONNECTION ) * Pool_Size );
#endif

	array_free( &My_Listeners );

	/* Groesster File-Descriptor fuer select() */
	Conn_MaxFD = 0;

	/* Connection-Struktur initialisieren */
	for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );

	/* Global write counter */
	WCounter = 0;
} /* Conn_Init */


GLOBAL void
Conn_Exit( void )
{
	/* Modul abmelden: alle noch offenen Connections
	 * schliessen und freigeben. */

	CONN_ID idx;

#ifdef DEBUG
	Log( LOG_DEBUG, "Shutting down all connections ..." );
#endif

	Conn_ExitListeners();

	/* Sockets schliessen */
	for( idx = 0; idx < Pool_Size; idx++ ) {
		if( My_Connections[idx].sock > NONE ) {
			Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
				"Server going down (restarting)":"Server going down", true );
			continue;
		}
	}

	free( My_Connections );
	My_Connections = NULL;
	Pool_Size = 0;
	io_library_shutdown();
} /* Conn_Exit */


static unsigned int
ports_initlisteners(array *a, void (*func)(int,short))
{
	unsigned int created = 0, len;
	int fd;
	UINT16 *port;

	len = array_length(a, sizeof (UINT16));
	port = array_start(a);
	while(len--) {
		fd = NewListener( *port );
		if (fd < 0) {
			port++;
			continue;
		}
		if (!io_event_create( fd, IO_WANTREAD, func )) {
			Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
							fd, (unsigned int) *port, strerror(errno));
			close(fd);
			port++;
			continue;
		}
		created++;
		port++;
	}

	return created;
}


GLOBAL int
Conn_InitListeners( void )
{
	/* Initialize ports on which the server should accept connections */

	unsigned int created;

	if (!io_library_init(CONNECTION_POOL)) {
		Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
		return -1;
	}

	created = ports_initlisteners(&Conf_ListenPorts, cb_listen);

	return created;
} /* Conn_InitListeners */


GLOBAL void
Conn_ExitListeners( void )
{
	/* Close down all listening sockets */
	int *fd;
	unsigned int arraylen;
#ifdef ZEROCONF
	Rendezvous_UnregisterListeners( );
#endif

	arraylen = array_length(&My_Listeners, sizeof (int));
	Log( LOG_INFO, "Shutting down all listening sockets (%d)...", arraylen );
	while(arraylen--) {
		fd = (int*) array_get(&My_Listeners, sizeof (int), arraylen);
		if (fd) {
			close(*fd);
#ifdef DEBUG
			Log( LOG_DEBUG, "Listening socket %d closed.", *fd );
		} else {
			Log( LOG_DEBUG, "array_get pos %d returned NULL", arraylen );
#endif
		}
	}
	array_free(&My_Listeners);
} /* Conn_ExitListeners */


/* return new listening port file descriptor or -1 on failure */
static int
NewListener( const UINT16 Port )
{
	/* Create new listening socket on specified port */

	struct sockaddr_in addr;
	struct in_addr inaddr;
	int sock;
#ifdef ZEROCONF
	char name[CLIENT_ID_LEN], *info;
#endif

	/* Server-"Listen"-Socket initialisieren */
	memset( &addr, 0, sizeof( addr ));
	memset( &inaddr, 0, sizeof( inaddr ));
	addr.sin_family = AF_INET;
	addr.sin_port = htons( Port );
	if( Conf_ListenAddress[0] )
	{
#ifdef HAVE_INET_ATON
		if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
#else
		inaddr.s_addr = inet_addr( Conf_ListenAddress );
		if( inaddr.s_addr == (unsigned)-1 )
#endif
		{
			Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!", Conf_ListenAddress, Port, Conf_ListenAddress );
			return -1;
		}
	}
	else inaddr.s_addr = htonl( INADDR_ANY );
	addr.sin_addr = inaddr;

	/* Socket erzeugen */
	sock = socket( PF_INET, SOCK_STREAM, 0);
	if( sock < 0 )
	{
		Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
		return -1;
	}

	if( ! Init_Socket( sock )) return -1;

	/* an Port binden */
	if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 )
	{
		Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno ));
		close( sock );
		return -1;
	}

	/* in "listen mode" gehen :-) */
	if( listen( sock, 10 ) != 0 )
	{
		Log( LOG_CRIT, "Can't listen on soecket: %s!", strerror( errno ));
		close( sock );
		return -1;
	}

	/* Neuen Listener in Strukturen einfuegen */
	if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
		Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
		close( sock );
		return -1;
	}

	if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
	else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );

#ifdef ZEROCONF
	/* Get best server description text */
	if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
	else
	{
		/* Use server info string */
		info = NULL;
		if( Conf_ServerInfo[0] == '[' )
		{
			/* Cut off leading hostname part in "[]" */
			info = strchr( Conf_ServerInfo, ']' );
			if( info )
			{
				info++;
				while( *info == ' ' ) info++;
			}
		}
		if( ! info ) info = Conf_ServerInfo;
	}

	/* Add port number to description if non-standard */
	if( Port != 6667 ) snprintf( name, sizeof( name ), "%s (port %u)", info, Port );
	else strlcpy( name, info, sizeof( name ));

	/* Register service */
	Rendezvous_Register( name, MDNS_TYPE, Port );
#endif
	return sock;
} /* NewListener */


GLOBAL void
Conn_Handler( void )
{
	/* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
	 * Call io_dispatch() to check for read/writeable sockets every second
	 * Wait for status change on pending connections (e.g: when the hostname has been resolved)
	 * check for penalty/timeouts
	 * handle input buffers
	 */
	int i;
	unsigned int wdatalen;
	struct timeval tv;
	time_t start, t;
	bool timeout;

	start = time( NULL );
	while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart ))
	{
		timeout = true;

#ifdef ZEROCONF
		Rendezvous_Handler( );
#endif

		/* Should the configuration be reloaded? */
		if( NGIRCd_SignalRehash ) NGIRCd_Rehash( );

		/* Check configured servers and established links */
		Check_Servers( );
		Check_Connections( );

		t = time( NULL );

		/* noch volle Lese-Buffer suchen */
		for( i = 0; i < Pool_Size; i++ )
		{
			if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
			 ( My_Connections[i].delaytime < t ))
			{
				/* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
				if (Handle_Buffer( i )) timeout = false;
			}
		}

		/* noch volle Schreib-Puffer suchen */
		for( i = 0; i < Pool_Size; i++ ) {
			if ( My_Connections[i].sock <= NONE )
				continue;

			wdatalen = array_bytes(&My_Connections[i].wbuf);

#ifdef ZLIB
			if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
#else
			if ( wdatalen > 0 )
#endif
			{
				/* Socket der Verbindung in Set aufnehmen */
				io_event_add( My_Connections[i].sock, IO_WANTWRITE );
			}
		}

		/* von welchen Sockets koennte gelesen werden? */
		for (i = 0; i < Pool_Size; i++ ) {
			if ( My_Connections[i].sock <= NONE )
				continue;

			if ( My_Connections[i].res_stat ) {
				/* wait for completion of Resolver Sub-Process */
				io_event_del( My_Connections[i].sock, IO_WANTREAD );
				continue;
			}

			if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
				continue;	/* wait for completion of connect() */

			if( My_Connections[i].delaytime > t ) {
				/* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
				io_event_del( My_Connections[i].sock, IO_WANTREAD );
				continue;
			}
			io_event_add( My_Connections[i].sock, IO_WANTREAD );
		}

		/* Timeout initialisieren */
		tv.tv_usec = 0;
		if( timeout ) tv.tv_sec = 1;
		else tv.tv_sec = 0;

		/* Auf Aktivitaet warten */
		i = io_dispatch( &tv );
		if (i == -1 && errno != EINTR ) {
			Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
			Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
			exit( 1 );
		}
	}

	if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
	else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
} /* Conn_Handler */


/**
 * Write a text string into the socket of a connection.
 * This function automatically appends CR+LF to the string and validates that
 * the result is a valid IRC message (oversized messages are shortened, for
 * example). Then it calls the Conn_Write() function to do the actual sending.
 * @param Idx Index fo the connection.
 * @param Format Format string, see printf().
 * @return true on success, false otherwise.
 */
#ifdef PROTOTYPES
GLOBAL bool
Conn_WriteStr( CONN_ID Idx, char *Format, ... )
#else
GLOBAL bool 
Conn_WriteStr( Idx, Format, va_alist )
CONN_ID Idx;
char *Format;
va_dcl
#endif
{
	char buffer[COMMAND_LEN];
	bool ok;
	va_list ap;

	assert( Idx > NONE );
	assert( Format != NULL );

#ifdef PROTOTYPES
	va_start( ap, Format );
#else
	va_start( ap );
#endif
	if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
		/*
		 * The string that should be written to the socket is longer
		 * than the allowed size of COMMAND_LEN bytes (including both
		 * the CR and LF characters). This can be caused by the
		 * IRC_WriteXXX() functions when the prefix of this server had
		 * to be added to an already "quite long" command line which
		 * has been received from a regular IRC client, for example.
		 * 
		 * We are not allowed to send such "oversized" messages to
		 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
		 * ("these messages SHALL NOT exceed 512 characters in length,
		 * counting all characters including the trailing CR-LF").
		 *
		 * So we have a big problem here: we should send more bytes
		 * to the network than we are allowed to and we don't know
		 * the originator (any more). The "old" behaviour of blaming
		 * the receiver ("next hop") is a bad idea (it could be just
		 * an other server only routing the message!), so the only
		 * option left is to shorten the string and to hope that the
		 * result is still somewhat useful ...
		 *                                                   -alex-
		 */

		strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
			CUT_TXTSUFFIX);
	}

#ifdef SNIFFER
	if (NGIRCd_Sniffer)
		Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
#endif

	strlcat( buffer, "\r\n", sizeof( buffer ));
	ok = Conn_Write( Idx, buffer, strlen( buffer ));
	My_Connections[Idx].msg_out++;

	va_end( ap );
	return ok;
} /* Conn_WriteStr */


GLOBAL bool
Conn_Write( CONN_ID Idx, char *Data, unsigned int Len )
{
	/* Daten in Socket schreiben. Bei "fatalen" Fehlern wird
	 * der Client disconnectiert und false geliefert. */

	assert( Idx > NONE );
	assert( Data != NULL );
	assert( Len > 0 );

	/* Ist der entsprechende Socket ueberhaupt noch offen? In einem
	 * "Handler-Durchlauf" kann es passieren, dass dem nicht mehr so
	 * ist, wenn einer von mehreren Conn_Write()'s fehlgeschlagen ist.
	 * In diesem Fall wird hier einfach ein Fehler geliefert. */
	if( My_Connections[Idx].sock <= NONE )
	{
#ifdef DEBUG
		Log( LOG_DEBUG, "Skipped write on closed socket (connection %d).", Idx );
#endif
		return false;
	}

	/* Pruefen, ob im Schreibpuffer genuegend Platz ist. Ziel ist es,
	 * moeglichts viel im Puffer zu haben und _nicht_ gleich alles auf den
	 * Socket zu schreiben (u.a. wg. Komprimierung). */
	if( array_bytes(&My_Connections[Idx].wbuf) >= WRITEBUFFER_LEN) {
		/* Der Puffer ist dummerweise voll. Jetzt versuchen, den Puffer
		 * zu schreiben, wenn das nicht klappt, haben wir ein Problem ... */
		if( ! Handle_Write( Idx )) return false;

		/* check again: if our writebuf is twice als large as the initial limit: Kill connection */
		if( array_bytes(&My_Connections[Idx].wbuf) >= (WRITEBUFFER_LEN*2)) {
			Log( LOG_NOTICE, "Write buffer overflow (connection %d)!", Idx );
			Conn_Close( Idx, "Write buffer overflow!", NULL, false );
			return false;
		}
	}

#ifdef ZLIB
	if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
		/* Daten komprimieren und in Puffer kopieren */
		if( ! Zip_Buffer( Idx, Data, Len )) return false;
	}
	else
#endif
	{
		/* Daten in Puffer kopieren */
		if (!array_catb( &My_Connections[Idx].wbuf, Data, Len ))
			return false;

		My_Connections[Idx].bytes_out += Len;
	}

	/* Adjust global write counter */
	WCounter += Len;

	return true;
} /* Conn_Write */


GLOBAL void
Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
{
	/* Close connection. Open pipes of asyncronous resolver
	 * sub-processes are closed down. */

	CLIENT *c;
	char *txt;
	double in_k, out_k;
#ifdef ZLIB
	double in_z_k, out_z_k;
	int in_p, out_p;
#endif

	assert( Idx > NONE );

	/* Is this link already shutting down? */
	if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
		/* Conn_Close() has been called recursively for this link;
		 * probabe reason: Handle_Write() failed  -- see below. */
#ifdef DEBUG
		Log( LOG_DEBUG, "Recursive request to close connection: %d", Idx );
#endif
		return;
	}

	assert( My_Connections[Idx].sock > NONE );

	/* Mark link as "closing" */
	Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
		
	if( LogMsg ) txt = LogMsg;
	else txt = FwdMsg;
	if( ! txt ) txt = "Reason unknown";

	Log( LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx, LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port ));

	/* Search client, if any */
	c = Client_GetFromConn( Idx );

	/* Should the client be informed? */
	if (InformClient) {
#ifndef STRICT_RFC
		/* Send statistics to client if registered as user: */
		if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
			Conn_WriteStr( Idx,
			 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
			 Client_ID(Client_ThisServer()), Client_ID(c),
			 NOTICE_TXTPREFIX,
			 (double)My_Connections[Idx].bytes_in / 1024,
			 (double)My_Connections[Idx].bytes_out / 1024);
		}
#endif

		/* Send ERROR to client (see RFC!) */
		if (FwdMsg)
			Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
		else
			Conn_WriteStr(Idx, "ERROR :Closing connection.");
	}

	/* Try to write out the write buffer */
	(void)Handle_Write( Idx );

	/* Shut down socket */
	if( ! io_close( My_Connections[Idx].sock ))
	{
		/* Oops, we can't close the socket!? This is ... ugly! */
		Log( LOG_CRIT, "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)", Idx, My_Connections[Idx].sock, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port), strerror( errno ));
	}

	/* Mark socket as invalid: */
	My_Connections[Idx].sock = NONE;

	/* If there is still a client, unregister it now */
	if( c ) Client_Destroy( c, LogMsg, FwdMsg, true );

	/* Calculate statistics and log information */
	in_k = (double)My_Connections[Idx].bytes_in / 1024;
	out_k = (double)My_Connections[Idx].bytes_out / 1024;
#ifdef ZLIB
	if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
		in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
		out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
		in_p = (int)(( in_k * 100 ) / in_z_k );
		out_p = (int)(( out_k * 100 ) / out_z_k );
		Log( LOG_INFO, "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).", Idx, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port ), in_k, in_z_k, in_p, out_k, out_z_k, out_p );
	}
	else
#endif
	{
		Log( LOG_INFO, "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).", Idx, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port ), in_k, out_k );
	}

	/* Is there a resolver sub-process running? */
	if( My_Connections[Idx].res_stat )
		FreeRes_stat( &My_Connections[Idx] );

	/* Servers: Modify time of next connect attempt? */
	Conf_UnsetServer( Idx );

#ifdef ZLIB
	/* Clean up zlib, if link was compressed */
	if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
		inflateEnd( &My_Connections[Idx].zip.in );
		deflateEnd( &My_Connections[Idx].zip.out );
		array_free(&My_Connections[Idx].zip.rbuf);
		array_free(&My_Connections[Idx].zip.wbuf);
	}
#endif

	array_free(&My_Connections[Idx].rbuf);
	array_free(&My_Connections[Idx].wbuf);
	/* Clean up connection structure (=free it) */
	Init_Conn_Struct( Idx );

#ifdef DEBUG
	Log( LOG_DEBUG, "Shutdown of connection %d completed.", Idx );
#endif
} /* Conn_Close */


GLOBAL void
Conn_SyncServerStruct( void )
{
	/* Synchronize server structures (connection IDs):
	 * connections <-> configuration */

	CLIENT *client;
	CONN_ID i;
	int c;

	for( i = 0; i < Pool_Size; i++ )
	{
		/* Established connection? */
		if( My_Connections[i].sock <= NONE ) continue;

		/* Server connection? */
		client = Client_GetFromConn( i );
		if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;

		for( c = 0; c < MAX_SERVERS; c++ )
		{
			/* Configured server? */
			if( ! Conf_Server[c].host[0] ) continue;

			/* Duplicate? */
			if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 ) Conf_Server[c].conn_id = i;
		}
	}
} /* SyncServerStruct */


static bool
Handle_Write( CONN_ID Idx )
{
	/* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */

	int len;
	unsigned int wdatalen;

	assert( Idx > NONE );
	if ( My_Connections[Idx].sock < 0 ) {
#ifdef DEBUG
		Log(LOG_DEBUG,
		    "Handle_Write() on closed socket, connection %d", Idx);
#endif
		return false;
	}

#ifdef DEBUG
	Log(LOG_DEBUG, "Handle_Write() called for connection %d ...", Idx);
#endif

	wdatalen = array_bytes(&My_Connections[Idx].wbuf );
#ifdef ZLIB
	if (wdatalen == 0 && !array_bytes(&My_Connections[Idx].zip.wbuf)) {
		io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
		return true;
	}

	/* write buffer empty, but not compression buffer?
         * -> flush compression buffer! */
	if (wdatalen == 0)
		Zip_Flush(Idx);
#else
	if (wdatalen == 0) {
		io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
		return true;
	}
#endif

 	/* Zip_Flush() may have changed the write buffer ... */
	wdatalen = array_bytes(&My_Connections[Idx].wbuf);

	len = write(My_Connections[Idx].sock,
	            array_start(&My_Connections[Idx].wbuf), wdatalen );

	if( len < 0 ) {
		if (errno == EAGAIN || errno == EINTR)
			return true;

		Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
		    Idx, My_Connections[Idx].sock, strerror(errno));
		Conn_Close(Idx, "Write error!", NULL, false);
		return false;
	}

	/* move any data not yet written to beginning */
	array_moveleft(&My_Connections[Idx].wbuf, 1, len);

	return true;
} /* Handle_Write */


static int
New_Connection( int Sock )
{
	/* Neue Client-Verbindung von Listen-Socket annehmen und
	 * CLIENT-Struktur anlegen. */

#ifdef TCPWRAP
	struct request_info req;
#endif
	struct sockaddr_in new_addr;
	int new_sock, new_sock_len;
	RES_STAT *s;
	CONN_ID idx;
	CLIENT *c;
	POINTER *ptr;
	long new_size, cnt;

	assert( Sock > NONE );
	/* Connection auf Listen-Socket annehmen */
	new_sock_len = sizeof( new_addr );
	new_sock = accept( Sock, (struct sockaddr *)&new_addr, (socklen_t *)&new_sock_len );
	if( new_sock < 0 )
	{
		Log( LOG_CRIT, "Can't accept connection: %s!", strerror( errno ));
		return -1;
	}

#ifdef TCPWRAP
	/* Validate socket using TCP Wrappers */
	request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
	fromhost(&req);
	if( ! hosts_access( &req ))
	{
		/* Access denied! */
		Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
		Simple_Message( new_sock, "ERROR :Connection refused" );
		close( new_sock );
		return -1;
	}
#endif

	/* Socket initialisieren */
	Init_Socket( new_sock );
	
	/* Check IP-based connection limit */
	cnt = Count_Connections( new_addr );
	if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
	{
		/* Access denied, too many connections from this IP address! */
		Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
		Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
		close( new_sock );
		return -1;
	}

	/* Freie Connection-Struktur suchen */
	for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == NONE ) break;
	if( idx >= Pool_Size )
	{
		new_size = Pool_Size + CONNECTION_POOL;

		/* Im bisherigen Pool wurde keine freie Connection-Struktur mehr gefunden.
		 * Wenn erlaubt und moeglich muss nun der Pool vergroessert werden: */

		if( Conf_MaxConnections > 0 )
		{
			/* Es ist ein Limit konfiguriert */
			if( Pool_Size >= Conf_MaxConnections )
			{
				/* Mehr Verbindungen duerfen wir leider nicht mehr annehmen ... */
				Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
				Simple_Message( new_sock, "ERROR :Connection limit reached" );
				close( new_sock );
				return -1;
			}
			if( new_size > Conf_MaxConnections ) new_size = Conf_MaxConnections;
		}
		if( new_size < Pool_Size )
		{
			Log( LOG_ALERT, "Can't accept connection: limit (%d) reached -- overflow!", Pool_Size );
			Simple_Message( new_sock, "ERROR :Connection limit reached" );
			close( new_sock );
			return -1;
		}

		ptr = (POINTER *)realloc( My_Connections, sizeof( CONNECTION ) * new_size );
		if( ! ptr ) {
			Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
			Simple_Message( new_sock, "ERROR: Internal error" );
			close( new_sock );
			return -1;
		}

#ifdef DEBUG
		Log( LOG_DEBUG, "Allocated new connection pool for %ld items (%ld bytes). [realloc()]", new_size, sizeof( CONNECTION ) * new_size );
#endif

		/* Adjust pointer to new block */
		My_Connections = (CONNECTION *)ptr;

		/* Initialize new items */
		for( idx = Pool_Size; idx < new_size; idx++ ) Init_Conn_Struct( idx );
		idx = Pool_Size;

		/* Adjust new pool size */
		Pool_Size = new_size;
	}

	/* Client-Struktur initialisieren */
	c = Client_NewLocal( idx, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
	if( ! c ) {
		Log( LOG_ALERT, "Can't accept connection: can't create client structure!" );
		Simple_Message( new_sock, "ERROR :Internal error" );
		close( new_sock );
		return -1;
	}

	/* Verbindung registrieren */
	Init_Conn_Struct( idx );
	My_Connections[idx].sock = new_sock;
	My_Connections[idx].addr = new_addr;

	/* Neuen Socket registrieren */
	if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
		Simple_Message( new_sock, "ERROR :Internal error" );
		Conn_Close( idx, "io_event_create() failed", NULL, false );
		return -1;
	}

	Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", idx, inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );

	/* Hostnamen ermitteln */
	strlcpy( My_Connections[idx].host, inet_ntoa( new_addr.sin_addr ), sizeof( My_Connections[idx].host ));
	Client_SetHostname( c, My_Connections[idx].host );
#ifdef IDENTAUTH
	s = Resolve_Addr( &new_addr, My_Connections[idx].sock );
#else
	s = Resolve_Addr( &new_addr );
#endif
	/* resolver process has been started */
	if( s ) My_Connections[idx].res_stat = s;

	/* Penalty-Zeit setzen */
	Conn_SetPenalty( idx, 4 );
	return new_sock;
} /* New_Connection */


static CONN_ID
Socket2Index( int Sock )
{
	/* zum Socket passende Connection suchen */

	CONN_ID idx;

	assert( Sock > NONE );

	for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == Sock ) break;

	if( idx >= Pool_Size )
	{
		/* die Connection wurde vermutlich (wegen eines
		 * Fehlers) bereits wieder abgebaut ... */
#ifdef DEBUG
		Log( LOG_DEBUG, "Socket2Index: can't get connection for socket %d!", Sock );
#endif
		return NONE;
	}
	else return idx;
} /* Socket2Index */


static void
Read_Request( CONN_ID Idx )
{
	/* Daten von Socket einlesen und entsprechend behandeln.
	 * Tritt ein Fehler auf, so wird der Socket geschlossen. */

	int len;
	char readbuf[1024];
	CLIENT *c;

	assert( Idx > NONE );
	assert( My_Connections[Idx].sock > NONE );

#ifdef ZLIB
	if (( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN ) ||
		( array_bytes(&My_Connections[Idx].zip.rbuf) >= ZREADBUFFER_LEN ))
#else
	if ( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN )
#endif
	{
		/* Der Lesepuffer ist voll */
		Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx,
						array_bytes(&My_Connections[Idx].rbuf));
		Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
		return;
	}

	len = read( My_Connections[Idx].sock, readbuf, sizeof readbuf -1 );
	if( len == 0 ) {
		Log( LOG_INFO, "%s:%d (%s) is closing the connection ...",
			My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port),
					inet_ntoa( My_Connections[Idx].addr.sin_addr ));
		Conn_Close( Idx, "Socket closed!", "Client closed connection", false );
		return;
	}

	if( len < 0 ) {
		if( errno == EAGAIN ) return;
		Log( LOG_ERR, "Read error on connection %d (socket %d): %s!", Idx,
					My_Connections[Idx].sock, strerror( errno ));
		Conn_Close( Idx, "Read error!", "Client closed connection", false );
		return;
	}
#ifdef ZLIB
	if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
		if (!array_catb( &My_Connections[Idx].zip.rbuf, readbuf, len)) {
			Log( LOG_ERR, "Could not append recieved data to zip input buffer (connn %d): %d bytes!", Idx, len );
			Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
			return;
		}
	} else
#endif
	{
		readbuf[len] = 0;
		if (!array_cats( &My_Connections[Idx].rbuf, readbuf )) {
			Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
			Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
		}
	}

	/* Update connection statistics */
	My_Connections[Idx].bytes_in += len;

	/* Update timestamp of last data received if this connection is
	 * registered as a user, server or service connection. Don't update
	 * otherwise, so users have at least Conf_PongTimeout seconds time to
	 * register with the IRC server -- see Check_Connections(). */
	c = Client_GetFromConn(Idx);
	if (c && (Client_Type(c) == CLIENT_USER
		  || Client_Type(c) == CLIENT_SERVER
		  || Client_Type(c) == CLIENT_SERVICE))
		My_Connections[Idx].lastdata = time(NULL);

	/* Look at the data in the (read-) buffer of this connection */
	Handle_Buffer(Idx);
} /* Read_Request */


static bool
Handle_Buffer( CONN_ID Idx )
{
	/* Handle Data in Connections Read-Buffer.
	 * Return true if a reuqest was handled, false otherwise (also returned on errors). */
#ifndef STRICT_RFC
	char *ptr1, *ptr2;
#endif
	char *ptr;
	int len, delta;
	bool result;
#ifdef ZLIB
	bool old_z;
#endif

	result = false;
	for (;;) {
		/* Check penalty */
		if( My_Connections[Idx].delaytime > time( NULL )) return result;
#ifdef ZLIB
		/* unpack compressed data */
		if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
			if( ! Unzip_Buffer( Idx )) return false;
#endif

		if (0 == array_bytes(&My_Connections[Idx].rbuf))
			break;

		if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
			return false;

		/* A Complete Request end with CR+LF, see RFC 2812. */
		ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );

		if( ptr ) delta = 2; /* complete request */
#ifndef STRICT_RFC
		else {
			/* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
			 * there are quite a few clients that do this (incl. "mIRC" :-( */
			ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
			ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
			delta = 1;
			if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
			else if( ptr1 ) ptr = ptr1;
			else if( ptr2 ) ptr = ptr2;
		}
#endif

		if( ! ptr )
			break;

		/* End of request found */
		*ptr = '\0';

		len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;

		if( len < 0 || len > ( COMMAND_LEN - 1 )) {
			/* Request must not exceed 512 chars (incl. CR+LF!), see
			 * RFC 2812. Disconnect Client if this happens. */
			Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
						Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
			Conn_Close( Idx, NULL, "Request too long", true );
			return false;
		}

		if (len <= 2) { /* request was empty (only '\r\n') */
			array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
			break;
		}
#ifdef ZLIB
		/* remember if stream is already compressed */
		old_z = My_Connections[Idx].options & CONN_ZIP;
#endif

		My_Connections[Idx].msg_in++;
		if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
			return false;

		result = true;

		array_moveleft(&My_Connections[Idx].rbuf, 1, len);
#ifdef DEBUG
		Log(LOG_DEBUG,
		    "Connection %d: %d bytes left in read buffer.",
		    Idx, array_bytes(&My_Connections[Idx].rbuf));
#endif
#ifdef ZLIB
		if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
				( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
		{
			/* The last Command activated Socket-Compression.
			 * Data that was read after that needs to be copied to Unzip-buf
			 * for decompression */
			if( array_bytes(&My_Connections[Idx].rbuf)> ZREADBUFFER_LEN ) {
				Log( LOG_ALERT, "Connection %d: No space left in unzip buf (need %u bytes)!",
								Idx, array_bytes(&My_Connections[Idx].rbuf ));
				return false;
			}
			if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
				return false;

			array_trunc(&My_Connections[Idx].rbuf);
#ifdef DEBUG
			Log( LOG_DEBUG, "Moved already received data (%u bytes) to uncompression buffer.",
								array_bytes(&My_Connections[Idx].zip.rbuf));
#endif /* DEBUG */
		}
#endif /* ZLIB */
	}

	return result;
} /* Handle_Buffer */


static void
Check_Connections( void )
{
	/* check if connections are alive. if not, play PING-PONG first.
	 * if this doesn't help either, disconnect client. */
	CLIENT *c;
	CONN_ID i;

	for( i = 0; i < Pool_Size; i++ ) {
		if (My_Connections[i].sock < 0)
			continue;

		c = Client_GetFromConn( i );
		if( c && (( Client_Type( c ) == CLIENT_USER ) || ( Client_Type( c ) == CLIENT_SERVER ) || ( Client_Type( c ) == CLIENT_SERVICE )))
		{
			/* connected User, Server or Service */
			if( My_Connections[i].lastping > My_Connections[i].lastdata ) {
				/* we already sent a ping */
				if( My_Connections[i].lastping < time( NULL ) - Conf_PongTimeout ) {
					/* Timeout */
#ifdef DEBUG
					Log( LOG_DEBUG, "Connection %d: Ping timeout: %d seconds.", i, Conf_PongTimeout );
#endif
					Conn_Close( i, NULL, "Ping timeout", true );
				}
			}
			else if( My_Connections[i].lastdata < time( NULL ) - Conf_PingTimeout ) {
				/* we need to sent a PING */
#ifdef DEBUG
				Log( LOG_DEBUG, "Connection %d: sending PING ...", i );
#endif
				My_Connections[i].lastping = time( NULL );
				Conn_WriteStr( i, "PING :%s", Client_ID( Client_ThisServer( )));
			}
		}
		else
		{
			/* The connection is not fully established yet, so
			 * we don't do the PING-PONG game here but instead
			 * disconnect the client after "a short time" if it's
			 * still not registered. */

			if (My_Connections[i].lastdata <
			    time(NULL) - Conf_PongTimeout) {
#ifdef DEBUG
				Log(LOG_DEBUG,
				    "Unregistered connection %d timed out ...",
				    i);
#endif
				Conn_Close(i, NULL, "Timeout", false);
			}
		}
	}
} /* Check_Connections */


static void
Check_Servers( void )
{
	/* Check if we can establish further server links */

	RES_STAT *s;
	CONN_ID idx;
	int i, n;

	/* Search all connections, are there results from the resolver? */
	for( idx = 0; idx < Pool_Size; idx++ ) {
		if( My_Connections[idx].sock != SERVER_WAIT ) continue;

		/* IP resolved? */
		if( My_Connections[idx].res_stat == NULL ) New_Server( Conf_GetServer( idx ), idx );
	}

	/* Check all configured servers */
	for( i = 0; i < MAX_SERVERS; i++ ) {
		/* Valid outgoing server which isn't already connected or disabled? */
		if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
			( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
				continue;

		/* Is there already a connection in this group? */
		if( Conf_Server[i].group > NONE ) {
			for (n = 0; n < MAX_SERVERS; n++) {
				if (n == i) continue;
				if ((Conf_Server[n].conn_id > NONE) &&
					(Conf_Server[n].group == Conf_Server[i].group))
						break;
			}
			if (n < MAX_SERVERS) continue;
		}

		/* Check last connect attempt? */
		if( Conf_Server[i].lasttry > time( NULL ) - Conf_ConnectRetry )
			continue;

		/* Okay, try to connect now */
		Conf_Server[i].lasttry = time( NULL );

		/* Search free connection structure */
		for( idx = 0; idx < Pool_Size; idx++ ) if( My_Connections[idx].sock == NONE ) break;
		if (idx >= Pool_Size) {
			Log( LOG_ALERT, "Can't establist server connection: connection limit reached (%d)!",
											Pool_Size );
			return;
		}
#ifdef DEBUG
		Log( LOG_DEBUG, "Preparing connection %d for \"%s\" ...", idx, Conf_Server[i].host );
#endif

		/* Verbindungs-Struktur initialisieren */
		Init_Conn_Struct( idx );
		My_Connections[idx].sock = SERVER_WAIT;
		Conf_Server[i].conn_id = idx;

		/* Resolve Hostname. If this fails, try to use it as an IP address */
		strlcpy( Conf_Server[i].ip, Conf_Server[i].host, sizeof( Conf_Server[i].ip ));
		strlcpy( My_Connections[idx].host, Conf_Server[i].host, sizeof( My_Connections[idx].host ));
		s = Resolve_Name( Conf_Server[i].host );

		/* resolver process running? */
		if( s ) My_Connections[idx].res_stat = s;
	}
} /* Check_Servers */


static void
New_Server( int Server, CONN_ID Idx )
{
	/* Establish new server link */

	struct sockaddr_in new_addr;
	struct in_addr inaddr;
	int res, new_sock;
	CLIENT *c;

	assert( Server > NONE );
	assert( Idx > NONE );

	/* Did we get a valid IP address? */
	if( ! Conf_Server[Server].ip[0] ) {
		/* No. Free connection structure and abort: */
		Log( LOG_ERR, "Can't connect to \"%s\": ip address unknown!", Conf_Server[Server].host );
        	Init_Conn_Struct( Idx );
	        Conf_Server[Server].conn_id = NONE;
		return;
	}

	Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
							Conf_Server[Server].ip, Conf_Server[Server].port );

#ifdef HAVE_INET_ATON
	if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
#else
	memset( &inaddr, 0, sizeof( inaddr ));
	inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
	if( inaddr.s_addr == (unsigned)-1 )
#endif
	{
		/* Can't convert IP address */
		Log( LOG_ERR, "Can't connect to \"%s\" (connection %d): can't convert ip address %s!", Conf_Server[Server].host, Idx, Conf_Server[Server].ip );
		goto out;
	}

	memset( &new_addr, 0, sizeof( new_addr ));
	new_addr.sin_family = AF_INET;
	new_addr.sin_addr = inaddr;
	new_addr.sin_port = htons( Conf_Server[Server].port );

	new_sock = socket( PF_INET, SOCK_STREAM, 0 );
	if ( new_sock < 0 ) {
		/* Can't create socket */
		Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
		goto out;
	}

	if( ! Init_Socket( new_sock )) return;

	res = connect( new_sock, (struct sockaddr *)&new_addr, sizeof( new_addr ));
	if(( res != 0 ) && ( errno != EINPROGRESS )) {
		/* Can't connect socket */
		Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
		close( new_sock );
		goto out;
	}

	/* Client-Struktur initialisieren */
	c = Client_NewLocal( Idx, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
	if( ! c ) {
		/* Can't create new client structure */
		Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
		close( new_sock );
		goto out;
	}

	Client_SetIntroducer( c, c );
	Client_SetToken( c, TOKEN_OUTBOUND );

	/* Register connection */
	My_Connections[Idx].sock = new_sock;
	My_Connections[Idx].addr = new_addr;
	strlcpy( My_Connections[Idx].host, Conf_Server[Server].host, sizeof( My_Connections[Idx].host ));

	/* Register new socket */
	if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
		Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
		Conn_Close( Idx, "io_event_create() failed", NULL, false );
		goto out;
	}

#ifdef DEBUG
	Log( LOG_DEBUG, "Registered new connection %d on socket %d.", Idx, My_Connections[Idx].sock );
#endif
	Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCONNECTING );
	return;
out:
	Init_Conn_Struct( Idx );
	Conf_Server[Server].conn_id = NONE;
} /* New_Server */


static void
Init_Conn_Struct( CONN_ID Idx )
{
	time_t now = time( NULL );
	/* Connection-Struktur initialisieren */

	memset( &My_Connections[Idx], 0, sizeof ( CONNECTION ));
	My_Connections[Idx].sock = NONE;
	My_Connections[Idx].lastdata = now;
	My_Connections[Idx].lastprivmsg = now;
} /* Init_Conn_Struct */


static bool
Init_Socket( int Sock )
{
	/* Initialize socket (set options) */

	int value;

	if (!io_setnonblock(Sock)) {
		Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
		close( Sock );
		return false;
	}

	/* Don't block this port after socket shutdown */
	value = 1;
	if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
	{
		Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
		/* ignore this error */
	}

	/* Set type of service (TOS) */
#if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
	value = IPTOS_LOWDELAY;
#ifdef DEBUG
	Log( LOG_DEBUG, "Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
#endif
	if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
	{
		Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
		/* ignore this error */
	}
#endif

	return true;
} /* Init_Socket */


GLOBAL
void Read_Resolver_Result( int r_fd )
{
	/* Read result of resolver sub-process from pipe and update the
	 * apropriate connection/client structure(s): hostname and/or
	 * IDENT user name.*/

	CLIENT *c;
	int bytes_read, i, n;
	unsigned int len;
	RES_STAT *s;
	char *ptr;
	char *bufptr;
	char readbuf[HOST_LEN];

	Log( LOG_DEBUG, "Resolver: started, fd %d", r_fd );
	/* Search associated connection ... */
	for( i = 0; i < Pool_Size; i++ ) {
		if(( My_Connections[i].sock != NONE )
		  && ( My_Connections[i].res_stat != NULL )
		  && ( My_Connections[i].res_stat->pipe[0] == r_fd ))
			break;
	}
	if( i >= Pool_Size ) {
		/* Ops, none found? Probably the connection has already
		 * been closed!? We'll ignore that ... */
		io_close( r_fd );
#ifdef DEBUG
		Log( LOG_DEBUG, "Resolver: Got result for unknown connection!?" );
#endif
		return;
	}

	/* Get resolver structure */
	s = My_Connections[i].res_stat;
	assert( s != NULL );

	/* Read result from pipe */
	bytes_read = read( r_fd, readbuf, sizeof readbuf -1 );
	if( bytes_read < 0 ) {
		/* Error! */
		Log( LOG_CRIT, "Resolver: Can't read result: %s!", strerror( errno ));
		FreeRes_stat( &My_Connections[i] );
		return;
	}
	len = (unsigned int) bytes_read;
	readbuf[len] = '\0';
	if (!array_catb(&s->buffer, readbuf, len)) {
		Log( LOG_CRIT, "Resolver: Can't append result %s to buffer: %s", readbuf, strerror( errno ));
		FreeRes_stat(&My_Connections[i]);
		return;
	}

	if (!array_cat0_temporary(&s->buffer)) {
		Log( LOG_CRIT, "Resolver: Can't append result %s to buffer: %s", readbuf, strerror( errno ));
		FreeRes_stat(&My_Connections[i]);
		return;
	}

	/* If the result string is incomplete, return to main loop and
	 * wait until we can read in more bytes. */
#ifdef IDENTAUTH
try_resolve:
#endif
	bufptr = (char*) array_start(&s->buffer);
	assert(bufptr != NULL);
	ptr = strchr( bufptr, '\n' );
	if( ! ptr ) return;
	*ptr = '\0';

#ifdef DEBUG
	Log( LOG_DEBUG, "Got result from resolver: \"%s\" (%u bytes read), stage %d.", bufptr, len, s->stage);
#endif

	/* Okay, we got a complete result: this is a host name for outgoing
	 * connections and a host name or IDENT user name (if enabled) for
	 * incoming connections.*/
	if( My_Connections[i].sock > NONE )
	{
		/* Incoming connection. Search client ... */
		c = Client_GetFromConn( i );
		assert( c != NULL );

		/* Only update client information of unregistered clients */
		if( Client_Type( c ) == CLIENT_UNKNOWN )
		{
			switch(s->stage) {
				case 0: /* host name */
				strlcpy( My_Connections[i].host, bufptr, sizeof( My_Connections[i].host));

				Client_SetHostname( c, bufptr);
#ifdef IDENTAUTH
				/* clean up buffer for IDENT result */
				len = strlen(bufptr) + 1;
				assert(len <= array_bytes(&s->buffer));
				array_moveleft(&s->buffer, 1, len);

				/* Don't close pipe and clean up, but
				 * instead wait for IDENT result */
				s->stage = 1;
				goto try_resolve;

				case 1: /* IDENT user name */
				if (array_bytes(&s->buffer)) {
					bufptr = (char*) array_start(&s->buffer);
					Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, bufptr);
					Client_SetUser( c, bufptr, true );
				}
				else Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
#endif
				break;
				default:
				Log( LOG_ERR, "Resolver: got result for unknown stage %d!?", s->stage );
			}
		}
#ifdef DEBUG
		else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
#endif
	}
	else
	{
		/* Outgoing connection (server link): set the IP address
		 * so that we can connect to it in the main loop. */

		/* Search server ... */
		n = Conf_GetServer( i );
		assert( n > NONE );

		bufptr = (char*) array_start(&s->buffer);
		strlcpy( Conf_Server[n].ip, bufptr, sizeof( Conf_Server[n].ip ));
	}

	/* Clean up ... */
	FreeRes_stat( &My_Connections[i] );

	/* Reset penalty time */
	Conn_ResetPenalty( i );
} /* Read_Resolver_Result */


static void
Simple_Message( int Sock, char *Msg )
{
	char buf[COMMAND_LEN];
	/* Write "simple" message to socket, without using compression
	 * or even the connection write buffers. Used e.g. for error
	 * messages by New_Connection(). */
	assert( Sock > NONE );
	assert( Msg != NULL );

	strlcpy( buf, Msg, sizeof buf - 2);
	strlcat( buf, "\r\n", sizeof buf);
	(void)write( Sock, buf, strlen( buf ) );
} /* Simple_Error */


static int
Count_Connections( struct sockaddr_in addr_in )
{
	int i, cnt;
	
	cnt = 0;
	for( i = 0; i < Pool_Size; i++ ) {
		if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
	}
	return cnt;
} /* Count_Connections */



/* -eof- */