1669 lines
45 KiB
C
1669 lines
45 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2005 Alexander Barton <alex@barton.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*
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* Connection management
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*/
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#define CONN_MODULE
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#include "portab.h"
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#include "io.h"
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static char UNUSED id[] = "$Id: conn.c,v 1.158 2005/07/08 16:18:39 alex Exp $";
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#include "imp.h"
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#include <assert.h>
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#ifdef PROTOTYPES
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# include <stdarg.h>
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#else
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# include <varargs.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <time.h>
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#include <netinet/in.h>
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#ifdef HAVE_NETINET_IP_H
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# include <netinet/ip.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#else
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# define PF_INET AF_INET
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#endif
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#ifdef HAVE_STDINT_H
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# include <stdint.h> /* e.g. for Mac OS X */
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#endif
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#ifdef TCPWRAP
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# include <tcpd.h> /* for TCP Wrappers */
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#endif
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#include "array.h"
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#include "defines.h"
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#include "resolve.h"
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#include "exp.h"
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#include "conn.h"
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#include "imp.h"
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#include "ngircd.h"
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#include "client.h"
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#include "conf.h"
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#include "conn-zip.h"
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#include "conn-func.h"
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#include "log.h"
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#include "parse.h"
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#include "tool.h"
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#ifdef ZEROCONF
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# include "rendezvous.h"
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#endif
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#include "exp.h"
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#define SERVER_WAIT (NONE - 1)
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LOCAL bool Handle_Write PARAMS(( CONN_ID Idx ));
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LOCAL void New_Connection PARAMS(( int Sock ));
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LOCAL CONN_ID Socket2Index PARAMS(( int Sock ));
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LOCAL void Read_Request PARAMS(( CONN_ID Idx ));
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LOCAL bool Handle_Buffer PARAMS(( CONN_ID Idx ));
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LOCAL void Check_Connections PARAMS(( void ));
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LOCAL void Check_Servers PARAMS(( void ));
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LOCAL void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
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LOCAL bool Init_Socket PARAMS(( int Sock ));
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LOCAL void New_Server PARAMS(( int Server, CONN_ID Idx ));
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LOCAL void Simple_Message PARAMS(( int Sock, char *Msg ));
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LOCAL int Count_Connections PARAMS(( struct sockaddr_in addr ));
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static array My_Listeners;
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#ifdef TCPWRAP
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int allow_severity = LOG_INFO;
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int deny_severity = LOG_ERR;
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#endif
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static void cb_clientserver PARAMS((int sock, short what));
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static void
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cb_listen(int sock, short irrelevant)
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{
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(void) irrelevant;
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New_Connection( sock );
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}
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static void
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cb_connserver(int sock, short what)
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{
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int res, err;
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socklen_t sock_len;
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CLIENT *c;
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CONN_ID idx = Socket2Index( sock );
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if (idx <= NONE) {
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#ifdef DEBUG
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Log(LOG_DEBUG, "cb_connserver wants to write on unknown socket?!");
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#endif
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io_close(sock);
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return;
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}
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assert( what & IO_WANTWRITE);
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/* connect() finished, get result. */
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sock_len = sizeof( err );
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res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
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assert( sock_len == sizeof( err ));
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/* Fehler aufgetreten? */
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if(( res != 0 ) || ( err != 0 )) {
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if ( res != 0 )
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Log( LOG_CRIT, "getsockopt (connection %d): %s!", idx, strerror( errno ));
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else
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Log( LOG_CRIT, "Can't connect socket to \"%s:%d\" (connection %d): %s!",
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My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port,
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idx, strerror( err ));
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/* Clean up socket, connection and client structures */
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c = Client_GetFromConn( idx );
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if( c ) Client_DestroyNow( c );
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io_close( My_Connections[idx].sock );
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Init_Conn_Struct( idx );
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/* Bei Server-Verbindungen lasttry-Zeitpunkt auf "jetzt" setzen */
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Conf_Server[Conf_GetServer( idx )].lasttry = time( NULL );
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Conf_UnsetServer( idx );
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return;
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}
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Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
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Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
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My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
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io_event_setcb( My_Connections[idx].sock, cb_clientserver);
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io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
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/* Send PASS and SERVER command to peer */
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Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
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Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
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}
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static void
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cb_clientserver(int sock, short what)
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{
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CONN_ID idx = Socket2Index( sock );
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if (idx <= NONE) {
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#ifdef DEBUG
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Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
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#endif
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io_close(sock);
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return;
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}
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if (what & IO_WANTREAD)
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Read_Request( idx );
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if (what & IO_WANTWRITE)
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Handle_Write( idx );
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}
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LOCAL void
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FreeRes_stat( CONNECTION *c )
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{
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assert( c != NULL );
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assert( c->res_stat != NULL );
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if (!c->res_stat) return;
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io_close( c->res_stat->pipe[0] );
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free( c->res_stat );
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c->res_stat = NULL;
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}
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GLOBAL void
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Conn_Init( void )
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{
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/* Modul initialisieren: statische Strukturen "ausnullen". */
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CONN_ID i;
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/* Speicher fuer Verbindungs-Pool anfordern */
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Pool_Size = CONNECTION_POOL;
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if( Conf_MaxConnections > 0 )
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{
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/* konfiguriertes Limit beachten */
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if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
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}
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My_Connections = (CONNECTION *) calloc( Pool_Size, sizeof( CONNECTION ) );
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if( ! My_Connections )
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{
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/* Speicher konnte nicht alloziert werden! */
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Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
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exit( 1 );
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}
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#ifdef DEBUG
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Log( LOG_DEBUG, "Allocated connection pool for %d items (%ld bytes).", Pool_Size, sizeof( CONNECTION ) * Pool_Size );
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#endif
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array_free( &My_Listeners );
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/* Groesster File-Descriptor fuer select() */
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Conn_MaxFD = 0;
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/* Connection-Struktur initialisieren */
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for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
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/* Global write counter */
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WCounter = 0;
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} /* Conn_Init */
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GLOBAL void
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Conn_Exit( void )
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{
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/* Modul abmelden: alle noch offenen Connections
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* schliessen und freigeben. */
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CONN_ID idx;
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#ifdef DEBUG
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Log( LOG_DEBUG, "Shutting down all connections ..." );
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#endif
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Conn_ExitListeners();
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/* Sockets schliessen */
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for( idx = 0; idx < Pool_Size; idx++ ) {
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if( My_Connections[idx].sock > NONE ) {
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Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
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"Server going down (restarting)":"Server going down", true );
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continue;
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}
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}
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free( My_Connections );
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My_Connections = NULL;
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Pool_Size = 0;
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io_library_shutdown();
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} /* Conn_Exit */
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GLOBAL int
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Conn_InitListeners( void )
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{
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/* Initialize ports on which the server should accept connections */
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int created, i;
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if (!io_library_init(CONNECTION_POOL)) {
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Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
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return -1;
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}
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created = 0;
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for( i = 0; i < Conf_ListenPorts_Count; i++ )
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{
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if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
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else Log( LOG_ERR, "Can't listen on port %u!", (unsigned int) Conf_ListenPorts[i] );
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}
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return created;
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} /* Conn_InitListeners */
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GLOBAL void
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Conn_ExitListeners( void )
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{
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/* Close down all listening sockets */
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int *fd;
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unsigned int arraylen;
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#ifdef ZEROCONF
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Rendezvous_UnregisterListeners( );
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#endif
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arraylen = array_length(&My_Listeners, sizeof (int));
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Log( LOG_INFO, "Shutting down all listening sockets (%d)...", arraylen );
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while(arraylen--) {
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fd = (int*) array_get(&My_Listeners, sizeof (int), arraylen);
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if (fd) {
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close(*fd);
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Log( LOG_DEBUG, "Listening socket %d closed.", *fd );
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#ifdef DEBUG
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} else {
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Log( LOG_DEBUG, "array_get pos %d returned NULL", arraylen );
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#endif
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}
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}
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array_free(&My_Listeners);
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} /* Conn_ExitListeners */
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GLOBAL bool
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Conn_NewListener( const UINT16 Port )
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{
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/* Create new listening socket on specified port */
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struct sockaddr_in addr;
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struct in_addr inaddr;
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int sock;
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#ifdef ZEROCONF
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char name[CLIENT_ID_LEN], *info;
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#endif
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/* Server-"Listen"-Socket initialisieren */
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memset( &addr, 0, sizeof( addr ));
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memset( &inaddr, 0, sizeof( inaddr ));
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addr.sin_family = AF_INET;
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addr.sin_port = htons( Port );
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if( Conf_ListenAddress[0] )
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{
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#ifdef HAVE_INET_ATON
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if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
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#else
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inaddr.s_addr = inet_addr( Conf_ListenAddress );
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if( inaddr.s_addr == (unsigned)-1 )
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#endif
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{
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Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!", Conf_ListenAddress, Port, Conf_ListenAddress );
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return false;
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}
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}
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else inaddr.s_addr = htonl( INADDR_ANY );
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addr.sin_addr = inaddr;
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/* Socket erzeugen */
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sock = socket( PF_INET, SOCK_STREAM, 0);
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if( sock < 0 )
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{
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Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
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return false;
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}
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if( ! Init_Socket( sock )) return false;
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/* an Port binden */
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if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 )
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{
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Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno ));
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close( sock );
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return false;
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}
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/* in "listen mode" gehen :-) */
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if( listen( sock, 10 ) != 0 )
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{
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Log( LOG_CRIT, "Can't listen on soecket: %s!", strerror( errno ));
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close( sock );
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return false;
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}
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/* Neuen Listener in Strukturen einfuegen */
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if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
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Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
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close( sock );
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return false;
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}
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io_event_create( sock, IO_WANTREAD, cb_listen );
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if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
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else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
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#ifdef ZEROCONF
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/* Get best server description text */
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if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
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else
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{
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/* Use server info string */
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info = NULL;
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if( Conf_ServerInfo[0] == '[' )
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{
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/* Cut off leading hostname part in "[]" */
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info = strchr( Conf_ServerInfo, ']' );
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if( info )
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{
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info++;
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while( *info == ' ' ) info++;
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}
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}
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if( ! info ) info = Conf_ServerInfo;
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}
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/* Add port number to description if non-standard */
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if( Port != 6667 ) snprintf( name, sizeof( name ), "%s (port %u)", info, Port );
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else strlcpy( name, info, sizeof( name ));
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/* Register service */
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Rendezvous_Register( name, MDNS_TYPE, Port );
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#endif
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return true;
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} /* Conn_NewListener */
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GLOBAL void
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Conn_Handler( void )
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{
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/* "Hauptschleife": Aktive Verbindungen ueberwachen. Folgende Aktionen
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* werden dabei durchgefuehrt, bis der Server terminieren oder neu
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* starten soll:
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*
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* - neue Verbindungen annehmen,
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* - Server-Verbindungen aufbauen,
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* - geschlossene Verbindungen loeschen,
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* - volle Schreibpuffer versuchen zu schreiben,
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* - volle Lesepuffer versuchen zu verarbeiten,
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* - Antworten von Resolver Sub-Prozessen annehmen.
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*/
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int i;
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unsigned int wdatalen;
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struct timeval tv;
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time_t start, t;
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bool timeout;
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start = time( NULL );
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while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart ))
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{
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timeout = true;
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#ifdef ZEROCONF
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Rendezvous_Handler( );
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#endif
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/* Should the configuration be reloaded? */
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if( NGIRCd_SignalRehash ) NGIRCd_Rehash( );
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/* Check configured servers and established links */
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Check_Servers( );
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Check_Connections( );
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t = time( NULL );
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/* noch volle Lese-Buffer suchen */
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for( i = 0; i < Pool_Size; i++ )
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{
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if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
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( My_Connections[i].delaytime < t ))
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{
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/* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
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if (Handle_Buffer( i )) timeout = false;
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}
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}
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/* noch volle Schreib-Puffer suchen */
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for( i = 0; i < Pool_Size; i++ ) {
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if ( My_Connections[i].sock <= NONE )
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continue;
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wdatalen = array_bytes(&My_Connections[i].wbuf);
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#ifdef ZLIB
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if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
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#else
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if ( wdatalen > 0 )
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#endif
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{
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/* Socket der Verbindung in Set aufnehmen */
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io_event_add( My_Connections[i].sock, IO_WANTWRITE );
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}
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}
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/* von welchen Sockets koennte gelesen werden? */
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for (i = 0; i < Pool_Size; i++ ) {
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if ( My_Connections[i].sock <= NONE )
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continue;
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if ( My_Connections[i].res_stat ) {
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/* wait for completion of Resolver Sub-Process */
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io_event_del( My_Connections[i].sock, IO_WANTREAD );
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continue;
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}
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if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
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continue; /* wait for completion of connect() */
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if( My_Connections[i].delaytime > t ) {
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/* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
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io_event_del( My_Connections[i].sock, IO_WANTREAD );
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continue;
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}
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io_event_add( My_Connections[i].sock, IO_WANTREAD );
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}
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/* Timeout initialisieren */
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tv.tv_usec = 0;
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if( timeout ) tv.tv_sec = 1;
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else tv.tv_sec = 0;
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/* Auf Aktivitaet warten */
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i = io_dispatch( &tv );
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if (i == -1 && errno != EINTR ) {
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Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
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Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
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exit( 1 );
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}
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}
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if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
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else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
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} /* Conn_Handler */
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/**
|
|
* 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, "NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.", Client_ThisServer( ), 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 */
|
|
|
|
|
|
LOCAL bool
|
|
Handle_Write( CONN_ID Idx )
|
|
{
|
|
/* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */
|
|
|
|
int len;
|
|
unsigned int wdatalen;
|
|
|
|
Log(LOG_DEBUG, "Handle_Write");
|
|
assert( Idx > NONE );
|
|
if ( My_Connections[Idx].sock < 0 ) {
|
|
Log(LOG_WARNING, "Handle_Write() on closed socket, idx %d", Idx);
|
|
return false;
|
|
}
|
|
assert( My_Connections[Idx].sock > NONE );
|
|
|
|
|
|
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 buf? -> flush compression buf. */
|
|
if( wdatalen == 0 ) Zip_Flush( Idx );
|
|
#else
|
|
if( wdatalen == 0 ) {
|
|
io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
wdatalen = array_bytes(&My_Connections[Idx].wbuf ); /* Zip_Flush may change 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 */
|
|
|
|
|
|
LOCAL void
|
|
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;
|
|
}
|
|
|
|
#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;
|
|
}
|
|
#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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#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;
|
|
}
|
|
|
|
/* Verbindung registrieren */
|
|
Init_Conn_Struct( idx );
|
|
My_Connections[idx].sock = new_sock;
|
|
My_Connections[idx].addr = new_addr;
|
|
|
|
/* Neuen Socket registrieren */
|
|
io_event_create( new_sock, IO_WANTREAD, cb_clientserver);
|
|
|
|
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 );
|
|
} /* New_Connection */
|
|
|
|
|
|
LOCAL 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 */
|
|
|
|
|
|
LOCAL void
|
|
Read_Request( CONN_ID Idx )
|
|
{
|
|
/* Daten von Socket einlesen und entsprechend behandeln.
|
|
* Tritt ein Fehler auf, so wird der Socket geschlossen. */
|
|
|
|
unsigned int bsize;
|
|
int len;
|
|
char readbuf[1024];
|
|
#ifdef ZLIB
|
|
CLIENT *c;
|
|
#endif
|
|
|
|
assert( Idx > NONE );
|
|
assert( My_Connections[Idx].sock > NONE );
|
|
|
|
/* wenn noch nicht registriert: maximal mit ZREADBUFFER_LEN arbeiten,
|
|
* ansonsten koennen Daten ggf. nicht umkopiert werden. */
|
|
bsize = READBUFFER_LEN;
|
|
#ifdef ZLIB
|
|
c = Client_GetFromConn( Idx );
|
|
|
|
if(( Client_Type( c ) != CLIENT_USER ) && ( Client_Type( c ) != CLIENT_SERVER ) &&
|
|
( Client_Type( c ) != CLIENT_SERVICE ) && ( bsize > ZREADBUFFER_LEN ))
|
|
bsize = ZREADBUFFER_LEN;
|
|
#endif
|
|
|
|
#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 );
|
|
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 );
|
|
}
|
|
}
|
|
|
|
/* Connection-Statistik aktualisieren */
|
|
My_Connections[Idx].bytes_in += len;
|
|
|
|
/* Timestamp aktualisieren */
|
|
My_Connections[Idx].lastdata = time( NULL );
|
|
|
|
Handle_Buffer( Idx );
|
|
} /* Read_Request */
|
|
|
|
|
|
LOCAL 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;
|
|
unsigned int arraylen;
|
|
bool action, result;
|
|
#ifdef ZLIB
|
|
bool old_z;
|
|
#endif
|
|
|
|
result = false;
|
|
do
|
|
{
|
|
/* 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
|
|
|
|
arraylen = array_bytes(&My_Connections[Idx].rbuf);
|
|
if (arraylen == 0)
|
|
break;
|
|
|
|
if (!array_cat0(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
|
|
return false;
|
|
|
|
array_truncate(&My_Connections[Idx].rbuf, 1, arraylen); /* do not count trailing NULL */
|
|
|
|
|
|
/* 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
|
|
|
|
action = false;
|
|
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;
|
|
}
|
|
|
|
#ifdef ZLIB
|
|
/* remember if stream is already compressed */
|
|
old_z = My_Connections[Idx].options & CONN_ZIP;
|
|
#endif
|
|
|
|
if( len > delta )
|
|
{
|
|
/* A Request was read */
|
|
My_Connections[Idx].msg_in++;
|
|
if( ! Parse_Request( Idx, (char*)array_start(&My_Connections[Idx].rbuf) )) return false;
|
|
else action = true;
|
|
|
|
array_moveleft(&My_Connections[Idx].rbuf, 1, len);
|
|
#ifdef DEBUG
|
|
Log(LOG_DEBUG, "%d byte left in rbuf", 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 ) {
|
|
/* No space left */
|
|
Log( LOG_ALERT, "Can't move receive buffer: No space left in unzip buffer (need %d bytes)!", 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 (%d bytes) to uncompression buffer.", array_bytes(&My_Connections[Idx].zip.rbuf));
|
|
#endif /* DEBUG */
|
|
}
|
|
#endif /* ZLIB */
|
|
if( action ) result = true;
|
|
} while( action );
|
|
|
|
return result;
|
|
} /* Handle_Buffer */
|
|
|
|
|
|
LOCAL void
|
|
Check_Connections( void )
|
|
{
|
|
/* Pruefen, ob Verbindungen noch "alive" sind. Ist dies
|
|
* nicht der Fall, zunaechst PING-PONG spielen und, wenn
|
|
* auch das nicht "hilft", Client disconnectieren. */
|
|
|
|
CLIENT *c;
|
|
CONN_ID i;
|
|
|
|
for( i = 0; i < Pool_Size; i++ )
|
|
{
|
|
if( My_Connections[i].sock == NONE ) continue;
|
|
|
|
c = Client_GetFromConn( i );
|
|
if( c && (( Client_Type( c ) == CLIENT_USER ) || ( Client_Type( c ) == CLIENT_SERVER ) || ( Client_Type( c ) == CLIENT_SERVICE )))
|
|
{
|
|
/* verbundener User, Server oder Service */
|
|
if( My_Connections[i].lastping > My_Connections[i].lastdata )
|
|
{
|
|
/* es wurde bereits ein PING gesendet */
|
|
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 )
|
|
{
|
|
/* es muss ein PING gesendet werden */
|
|
#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
|
|
{
|
|
/* noch nicht vollstaendig aufgebaute Verbindung */
|
|
if( My_Connections[i].lastdata < time( NULL ) - Conf_PingTimeout )
|
|
{
|
|
/* Timeout */
|
|
#ifdef DEBUG
|
|
Log( LOG_DEBUG, "Connection %d timed out ...", i );
|
|
#endif
|
|
Conn_Close( i, NULL, "Timeout", false );
|
|
}
|
|
}
|
|
}
|
|
} /* Check_Connections */
|
|
|
|
|
|
LOCAL void
|
|
Check_Servers( void )
|
|
{
|
|
/* Check if we can establish further server links */
|
|
|
|
RES_STAT *s;
|
|
CONN_ID idx;
|
|
int i, n;
|
|
|
|
/* Serach 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 */
|
|
|
|
|
|
LOCAL 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: */
|
|
Init_Conn_Struct( Idx );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
Log( LOG_ERR, "Can't connect to \"%s\" (connection %d): ip address unknown!", Conf_Server[Server].host, Idx );
|
|
return;
|
|
}
|
|
|
|
Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d (connection %d) ... ", Conf_Server[Server].host, Conf_Server[Server].ip, Conf_Server[Server].port, Idx );
|
|
|
|
#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 */
|
|
Init_Conn_Struct( Idx );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
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 );
|
|
return;
|
|
}
|
|
|
|
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 */
|
|
Init_Conn_Struct( Idx );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
|
|
return;
|
|
}
|
|
|
|
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 );
|
|
Init_Conn_Struct( Idx );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
return;
|
|
}
|
|
|
|
/* Client-Struktur initialisieren */
|
|
c = Client_NewLocal( Idx, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
|
|
if( ! c )
|
|
{
|
|
/* Can't create new client structure */
|
|
close( new_sock );
|
|
Init_Conn_Struct( Idx );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
|
|
return;
|
|
}
|
|
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 */
|
|
io_event_create( new_sock, IO_WANTWRITE, cb_connserver);
|
|
Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCONNECTING );
|
|
|
|
#ifdef DEBUG
|
|
Log( LOG_DEBUG, "Registered new connection %d on socket %d.", Idx, My_Connections[Idx].sock );
|
|
#endif
|
|
} /* New_Server */
|
|
|
|
|
|
LOCAL 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 */
|
|
|
|
|
|
LOCAL 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 len, i, n;
|
|
RES_STAT *s;
|
|
char *ptr;
|
|
|
|
Log( LOG_DEBUG, "Resolver: started, fd %d\n", 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 */
|
|
len = read( r_fd, s->buffer + s->bufpos, sizeof( s->buffer ) - s->bufpos - 1 );
|
|
if( len < 0 )
|
|
{
|
|
/* Error! */
|
|
Log( LOG_CRIT, "Resolver: Can't read result: %s!", strerror( errno ));
|
|
FreeRes_stat( &My_Connections[i] );
|
|
return;
|
|
}
|
|
s->bufpos += len;
|
|
s->buffer[s->bufpos] = '\0';
|
|
|
|
/* If the result string is incomplete, return to main loop and
|
|
* wait until we can read in more bytes. */
|
|
#ifdef IDENTAUTH
|
|
try_resolve:
|
|
#endif
|
|
ptr = strchr( s->buffer, '\n' );
|
|
if( ! ptr ) return;
|
|
*ptr = '\0';
|
|
|
|
#ifdef DEBUG
|
|
Log( LOG_DEBUG, "Got result from resolver: \"%s\" (%d bytes), stage %d.", s->buffer, 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, s->buffer, sizeof( My_Connections[i].host ));
|
|
Client_SetHostname( c, s->buffer );
|
|
#ifdef IDENTAUTH
|
|
/* clean up buffer for IDENT result */
|
|
len = strlen( s->buffer ) + 1;
|
|
assert((size_t) len <= sizeof( s->buffer ));
|
|
memmove( s->buffer, s->buffer + len, sizeof( s->buffer ) - len );
|
|
assert(len <= s->bufpos );
|
|
s->bufpos -= 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( s->buffer[0] )
|
|
{
|
|
Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, s->buffer );
|
|
Client_SetUser( c, s->buffer, 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 );
|
|
|
|
strlcpy( Conf_Server[n].ip, s->buffer, sizeof( Conf_Server[n].ip ));
|
|
}
|
|
|
|
/* Clean up ... */
|
|
FreeRes_stat( &My_Connections[i] );
|
|
|
|
/* Reset penalty time */
|
|
Conn_ResetPenalty( i );
|
|
} /* Read_Resolver_Result */
|
|
|
|
|
|
LOCAL 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 */
|
|
|
|
|
|
LOCAL 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- */
|