1728 lines
46 KiB
C
1728 lines
46 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2007 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 1.221 2008/02/26 22:04:17 fw 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_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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static bool Handle_Write PARAMS(( CONN_ID Idx ));
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static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
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static int New_Connection PARAMS(( int Sock ));
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static CONN_ID Socket2Index PARAMS(( int Sock ));
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static void Read_Request PARAMS(( CONN_ID Idx ));
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static bool Handle_Buffer PARAMS(( CONN_ID Idx ));
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static void Check_Connections PARAMS(( void ));
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static void Check_Servers PARAMS(( void ));
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static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
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static bool Init_Socket PARAMS(( int Sock ));
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static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
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static void Simple_Message PARAMS(( int Sock, const char *Msg ));
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static int NewListener PARAMS(( int af, const UINT16 Port ));
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static array My_Listeners;
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static array My_ConnArray;
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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 server_login PARAMS((CONN_ID idx));
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static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what));
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static void cb_Connect_to_Server PARAMS(( int sock, UNUSED short what));
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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, UNUSED 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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CONN_ID idx = Socket2Index( sock );
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if (idx <= NONE) {
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LogDebug("cb_connserver wants to write on unknown socket?!");
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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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/* Error while connecting? */
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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!",
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idx, strerror(errno));
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else
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Log(LOG_CRIT,
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"Can't connect socket to \"%s:%d\" (connection %d): %s!",
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My_Connections[idx].host,
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Conf_Server[Conf_GetServer(idx)].port,
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idx, strerror(err));
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res = Conf_GetServer(idx);
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assert(res >= 0);
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Conn_Close(idx, "Can't connect!", NULL, false);
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if (res < 0)
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return;
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if (ng_ipaddr_af(&Conf_Server[res].dst_addr[0])) {
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/* more addresses to try... */
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New_Server(res, &Conf_Server[res].dst_addr[0]);
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/* connection to dst_addr[0] in progress, remove this address... */
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Conf_Server[res].dst_addr[0] = Conf_Server[res].dst_addr[1];
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memset(&Conf_Server[res].dst_addr[1], 0, sizeof(&Conf_Server[res].dst_addr[1]));
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}
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return;
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}
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res = Conf_GetServer(idx);
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assert(res >= 0);
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if (res >= 0) /* connect succeeded, remove all additional addresses */
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memset(&Conf_Server[res].dst_addr, 0, sizeof(&Conf_Server[res].dst_addr));
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Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
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server_login(idx);
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}
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static void
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server_login(CONN_ID idx)
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{
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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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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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if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
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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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/* FIXME: My_Connetions/Pool_Size is needed by other parts of the
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* code; remove them! */
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My_Connections = (CONNECTION*) array_start(&My_ConnArray);
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LogDebug("Allocated connection pool for %d items (%ld bytes).",
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array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
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assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
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array_free( &My_Listeners );
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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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LogDebug("Shutting down all connections ..." );
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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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}
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}
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array_free(&My_ConnArray);
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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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static unsigned int
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ports_initlisteners(array *a, int af, void (*func)(int,short))
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{
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unsigned int created = 0;
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size_t len;
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int fd;
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UINT16 *port;
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len = array_length(a, sizeof (UINT16));
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port = array_start(a);
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while(len--) {
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fd = NewListener(af, *port);
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if (fd < 0) {
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port++;
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continue;
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}
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if (!io_event_create( fd, IO_WANTREAD, func )) {
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Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
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fd, (unsigned int) *port, strerror(errno));
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close(fd);
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port++;
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continue;
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}
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created++;
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port++;
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}
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return created;
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}
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GLOBAL unsigned 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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unsigned int created = 0;
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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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#ifdef WANT_IPV6
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if (!Conf_NoListenIpv6)
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created = ports_initlisteners(&Conf_ListenPorts, AF_INET6, cb_listen);
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#endif
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created += ports_initlisteners(&Conf_ListenPorts, AF_INET, cb_listen);
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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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size_t 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 total)...", arraylen );
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fd = array_start(&My_Listeners);
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while(arraylen--) {
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assert(fd != NULL);
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assert(*fd >= 0);
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io_close(*fd);
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LogDebug("Listening socket %d closed.", *fd );
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fd++;
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}
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array_free(&My_Listeners);
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} /* Conn_ExitListeners */
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static bool
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InitSinaddrListenAddr(int af, ng_ipaddr_t *addr, UINT16 Port)
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{
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bool ret;
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const char *listen_addrstr = NULL;
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#ifdef WANT_IPV6
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if (af == AF_INET)
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listen_addrstr = "0.0.0.0";
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#else
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(void)af;
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#endif
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if (Conf_ListenAddress[0]) /* overrides V4/V6 atm */
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listen_addrstr = Conf_ListenAddress;
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ret = ng_ipaddr_init(addr, listen_addrstr, Port);
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if (!ret) {
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if (!listen_addrstr)
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listen_addrstr = "";
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Log(LOG_CRIT, "Can't bind to %s:%u: can't convert ip address \"%s\"",
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listen_addrstr, Port, listen_addrstr);
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}
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return ret;
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}
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static void
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set_v6_only(int af, int sock)
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{
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#if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
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int on = 1;
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if (af != AF_INET6)
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return;
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if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)))
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Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
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#else
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(void)af;
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(void)sock;
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#endif
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}
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/* return new listening port file descriptor or -1 on failure */
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static int
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NewListener(int af, const UINT16 Port)
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{
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/* Create new listening socket on specified port */
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ng_ipaddr_t addr;
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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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if (!InitSinaddrListenAddr(af, &addr, Port))
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return -1;
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sock = socket(ng_ipaddr_af(&addr), SOCK_STREAM, 0);
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if( sock < 0 ) {
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Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
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return -1;
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}
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af = ng_ipaddr_af(&addr);
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set_v6_only(af, sock);
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if( ! Init_Socket( sock )) return -1;
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if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
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Log( LOG_CRIT, "Can't bind socket (port %d) : %s!", Port, strerror( errno ));
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close( sock );
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return -1;
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}
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if( listen( sock, 10 ) != 0 ) {
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Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
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close( sock );
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return -1;
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}
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/* keep fd in list so we can close it when ngircd restarts/shuts down */
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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 -1;
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}
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#ifdef WANT_IPV6
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if (af == AF_INET6)
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Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
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else
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#endif
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Log(LOG_INFO, "Now listening on %s:%d (socket %d).", ng_ipaddr_tostr(&addr), 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)
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snprintf(name, sizeof name, "%s (port %u)", info,
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(unsigned int)Port);
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else
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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 sock;
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} /* NewListener */
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GLOBAL void
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Conn_Handler( void )
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{
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/* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
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* Call io_dispatch() to check for read/writeable sockets every second
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* Wait for status change on pending connections (e.g: when the hostname has been resolved)
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* check for penalty/timeouts
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* handle input buffers
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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 t;
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bool timeout;
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while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) {
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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) {
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NGIRCd_Rehash( );
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}
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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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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 = (unsigned int)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? */
|
|
for (i = 0; i < Pool_Size; i++ ) {
|
|
if ( My_Connections[i].sock <= NONE )
|
|
continue;
|
|
|
|
if (Resolve_INPROGRESS(&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 );
|
|
}
|
|
|
|
/* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */
|
|
tv.tv_usec = 0;
|
|
tv.tv_sec = timeout ? 1 : 0;
|
|
|
|
/* wait for activity */
|
|
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];
|
|
size_t 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
|
|
|
|
len = strlcat( buffer, "\r\n", sizeof( buffer ));
|
|
ok = Conn_Write(Idx, buffer, len);
|
|
My_Connections[Idx].msg_out++;
|
|
|
|
va_end( ap );
|
|
return ok;
|
|
} /* Conn_WriteStr */
|
|
|
|
|
|
/**
|
|
* Append Data to the outbound write buffer of a connection.
|
|
* @param Idx Index of the connection.
|
|
* @param Data pointer to the data.
|
|
* @param Len length of Data.
|
|
* @return true on success, false otherwise.
|
|
*/
|
|
static bool
|
|
Conn_Write( CONN_ID Idx, char *Data, size_t Len )
|
|
{
|
|
CLIENT *c;
|
|
size_t writebuf_limit = WRITEBUFFER_LEN;
|
|
assert( Idx > NONE );
|
|
assert( Data != NULL );
|
|
assert( Len > 0 );
|
|
|
|
c = Conn_GetClient(Idx);
|
|
assert( c != NULL);
|
|
|
|
/* Servers do get special write buffer limits, so they can generate
|
|
* all the messages that are required while peering. */
|
|
if (Client_Type(c) == CLIENT_SERVER)
|
|
writebuf_limit = WRITEBUFFER_SLINK_LEN;
|
|
|
|
/* Is the socket still open? A previous call to Conn_Write()
|
|
* may have closed the connection due to a fatal error.
|
|
* In this case it is sufficient to return an error, as well. */
|
|
if( My_Connections[Idx].sock <= NONE ) {
|
|
LogDebug("Skipped write on closed socket (connection %d).", Idx);
|
|
return false;
|
|
}
|
|
|
|
#ifdef ZLIB
|
|
if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
|
|
/* Compressed link:
|
|
* Zip_Buffer() does all the dirty work for us: it flushes
|
|
* the (pre-)compression buffers if required and handles
|
|
* all error conditions. */
|
|
if (!Zip_Buffer(Idx, Data, Len))
|
|
return false;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
/* Uncompressed link:
|
|
* Check if outbound buffer has enough space for the data. */
|
|
if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
|
|
writebuf_limit) {
|
|
/* Buffer is full, flush it. Handle_Write deals with
|
|
* low-level errors, if any. */
|
|
if (!Handle_Write(Idx))
|
|
return false;
|
|
}
|
|
|
|
/* When the write buffer is still too big after flushing it,
|
|
* the connection will be killed. */
|
|
if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
|
|
writebuf_limit) {
|
|
Log(LOG_NOTICE,
|
|
"Write buffer overflow (connection %d, size %lu byte)!",
|
|
Idx,
|
|
(unsigned long)array_bytes(&My_Connections[Idx].wbuf));
|
|
Conn_Close(Idx, "Write buffer overflow!", NULL, false);
|
|
return false;
|
|
}
|
|
|
|
/* Copy data to write buffer */
|
|
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;
|
|
UINT16 port;
|
|
#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. */
|
|
LogDebug("Recursive request to close connection: %d", Idx );
|
|
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";
|
|
|
|
port = ng_ipaddr_getport(&My_Connections[Idx].addr);
|
|
Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
|
|
LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
|
|
|
|
/* Search client, if any */
|
|
c = Conn_GetClient( 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. Note: Handle_Write() eventually
|
|
* removes the CLIENT structure associated with this connection if an
|
|
* error occurs! So we have to re-check if there is still an valid
|
|
* CLIENT structure after calling Handle_Write() ...*/
|
|
(void)Handle_Write( Idx );
|
|
|
|
/* Search client, if any (re-check!) */
|
|
c = Conn_GetClient( 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,
|
|
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;
|
|
/* Make sure that no division by zero can occur during
|
|
* the calculation of in_p and out_p: in_z_k and out_z_k
|
|
* are non-zero, that's guaranteed by the protocol until
|
|
* compression can be enabled. */
|
|
if (! in_z_k)
|
|
in_z_k = in_k;
|
|
if (! out_z_k)
|
|
out_z_k = out_k;
|
|
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, 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, port,
|
|
in_k, out_k);
|
|
}
|
|
|
|
/* cancel running resolver */
|
|
if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
|
|
Resolve_Shutdown(&My_Connections[Idx].res_stat);
|
|
|
|
/* 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 );
|
|
|
|
LogDebug("Shutdown of connection %d completed.", Idx );
|
|
} /* 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 < 0)
|
|
continue;
|
|
|
|
/* Server connection? */
|
|
client = Conn_GetClient( 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 */
|
|
|
|
|
|
/**
|
|
* Send out data of write buffer; connect new sockets.
|
|
*/
|
|
static bool
|
|
Handle_Write( CONN_ID Idx )
|
|
{
|
|
ssize_t len;
|
|
size_t wdatalen;
|
|
|
|
assert( Idx > NONE );
|
|
if ( My_Connections[Idx].sock < 0 ) {
|
|
LogDebug("Handle_Write() on closed socket, connection %d", Idx);
|
|
return false;
|
|
}
|
|
assert( My_Connections[Idx].sock > NONE );
|
|
|
|
wdatalen = array_bytes(&My_Connections[Idx].wbuf );
|
|
|
|
#ifdef ZLIB
|
|
if (wdatalen == 0) {
|
|
/* Write buffer is empty, so we try to flush the compression
|
|
* buffer and get some data to work with from there :-) */
|
|
if (!Zip_Flush(Idx))
|
|
return false;
|
|
|
|
/* Now the write buffer most probably has changed: */
|
|
wdatalen = array_bytes(&My_Connections[Idx].wbuf);
|
|
}
|
|
#endif
|
|
|
|
if (wdatalen == 0) {
|
|
/* Still no data, fine. */
|
|
io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
|
|
return true;
|
|
}
|
|
|
|
LogDebug
|
|
("Handle_Write() called for connection %d, %ld bytes pending ...",
|
|
Idx, wdatalen);
|
|
|
|
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, (size_t)len);
|
|
|
|
return true;
|
|
} /* Handle_Write */
|
|
|
|
|
|
static int
|
|
Count_Connections(ng_ipaddr_t *a)
|
|
{
|
|
int i, cnt;
|
|
|
|
cnt = 0;
|
|
for (i = 0; i < Pool_Size; i++) {
|
|
if (My_Connections[i].sock <= NONE)
|
|
continue;
|
|
if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
|
|
cnt++;
|
|
}
|
|
return cnt;
|
|
} /* Count_Connections */
|
|
|
|
|
|
static int
|
|
New_Connection( int Sock )
|
|
{
|
|
/* Neue Client-Verbindung von Listen-Socket annehmen und
|
|
* CLIENT-Struktur anlegen. */
|
|
|
|
#ifdef TCPWRAP
|
|
struct request_info req;
|
|
#endif
|
|
ng_ipaddr_t new_addr;
|
|
char ip_str[NG_INET_ADDRSTRLEN];
|
|
int new_sock, new_sock_len, new_Pool_Size;
|
|
CLIENT *c;
|
|
long cnt;
|
|
|
|
assert( Sock > NONE );
|
|
/* Connection auf Listen-Socket annehmen */
|
|
new_sock_len = (int)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;
|
|
}
|
|
|
|
if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
|
|
Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
|
|
Simple_Message(new_sock, "ERROR :Internal Server Error");
|
|
close(new_sock);
|
|
}
|
|
|
|
#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)) {
|
|
Log (deny_severity, "Refused connection from %s (by TCP Wrappers)!", ip_str);
|
|
Simple_Message( new_sock, "ERROR :Connection refused" );
|
|
close( new_sock );
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* Socket initialisieren */
|
|
if (!Init_Socket( new_sock ))
|
|
return -1;
|
|
|
|
/* 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!", ip_str, cnt);
|
|
Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
|
|
close( new_sock );
|
|
return -1;
|
|
}
|
|
|
|
if( new_sock >= Pool_Size ) {
|
|
new_Pool_Size = new_sock + 1;
|
|
/* No free Connection Structures, check if we may accept further connections */
|
|
if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
|
|
(new_Pool_Size < Pool_Size))
|
|
{
|
|
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 (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
|
|
(size_t)new_sock)) {
|
|
Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
|
|
Simple_Message( new_sock, "ERROR: Internal error" );
|
|
close( new_sock );
|
|
return -1;
|
|
}
|
|
LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
|
|
new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
|
|
|
|
/* Adjust pointer to new block */
|
|
My_Connections = array_start(&My_ConnArray);
|
|
while (Pool_Size < new_Pool_Size)
|
|
Init_Conn_Struct(Pool_Size++);
|
|
}
|
|
|
|
/* register callback */
|
|
if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
|
|
Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
|
|
Simple_Message(new_sock, "ERROR :Internal error");
|
|
close(new_sock);
|
|
return -1;
|
|
}
|
|
|
|
c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false );
|
|
if( ! c ) {
|
|
Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
|
|
Simple_Message(new_sock, "ERROR :Internal error");
|
|
io_close(new_sock);
|
|
return -1;
|
|
}
|
|
|
|
Init_Conn_Struct( new_sock );
|
|
My_Connections[new_sock].sock = new_sock;
|
|
My_Connections[new_sock].addr = new_addr;
|
|
My_Connections[new_sock].client = c;
|
|
|
|
Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
|
|
ip_str, ng_ipaddr_getport(&new_addr), Sock);
|
|
|
|
/* Hostnamen ermitteln */
|
|
strlcpy(My_Connections[new_sock].host, ip_str, sizeof(My_Connections[new_sock].host));
|
|
|
|
Client_SetHostname(c, My_Connections[new_sock].host);
|
|
|
|
if (!Conf_NoDNS)
|
|
Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
|
|
My_Connections[new_sock].sock, cb_Read_Resolver_Result);
|
|
|
|
Conn_SetPenalty(new_sock, 4);
|
|
return new_sock;
|
|
} /* New_Connection */
|
|
|
|
|
|
static CONN_ID
|
|
Socket2Index( int Sock )
|
|
{
|
|
/* zum Socket passende Connection suchen */
|
|
|
|
assert( Sock >= 0 );
|
|
|
|
if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
|
|
/* die Connection wurde vermutlich (wegen eines
|
|
* Fehlers) bereits wieder abgebaut ... */
|
|
LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
|
|
return NONE;
|
|
}
|
|
return Sock;
|
|
} /* Socket2Index */
|
|
|
|
|
|
/**
|
|
* Read data from the network to the read buffer. If an error occures,
|
|
* the socket of this connection will be shut down.
|
|
*/
|
|
static void
|
|
Read_Request( CONN_ID Idx )
|
|
{
|
|
ssize_t len;
|
|
char readbuf[READBUFFER_LEN];
|
|
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) >= READBUFFER_LEN))
|
|
#else
|
|
if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
|
|
#endif
|
|
{
|
|
/* Read buffer is full */
|
|
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:%u (%s) is closing the connection ...",
|
|
My_Connections[Idx].host,
|
|
(unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
|
|
ng_ipaddr_tostr(&My_Connections[Idx].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,
|
|
(size_t) 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
|
|
{
|
|
if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
|
|
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().
|
|
* Set "lastping", too, so we can handle time shifts backwards ... */
|
|
c = Conn_GetClient(Idx);
|
|
if (c && (Client_Type(c) == CLIENT_USER
|
|
|| Client_Type(c) == CLIENT_SERVER
|
|
|| Client_Type(c) == CLIENT_SERVICE)) {
|
|
My_Connections[Idx].lastdata = time(NULL);
|
|
My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
|
|
}
|
|
|
|
/* 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;
|
|
size_t len, delta;
|
|
bool result;
|
|
time_t starttime;
|
|
#ifdef ZLIB
|
|
bool old_z;
|
|
#endif
|
|
|
|
starttime = time(NULL);
|
|
result = false;
|
|
for (;;) {
|
|
/* Check penalty */
|
|
if( My_Connections[Idx].delaytime > starttime) 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 > ( 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);
|
|
LogDebug("Connection %d: %d bytes left in read buffer.",
|
|
Idx, array_bytes(&My_Connections[Idx].rbuf));
|
|
#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_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
|
|
return false;
|
|
|
|
array_trunc(&My_Connections[Idx].rbuf);
|
|
LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
|
|
array_bytes(&My_Connections[Idx].zip.rbuf));
|
|
}
|
|
#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 = Conn_GetClient(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 */
|
|
LogDebug
|
|
("Connection %d: Ping timeout: %d seconds.",
|
|
i, Conf_PongTimeout);
|
|
Conn_Close(i, NULL, "Ping timeout",
|
|
true);
|
|
}
|
|
} else if (My_Connections[i].lastdata <
|
|
time(NULL) - Conf_PingTimeout) {
|
|
/* We need to send a PING ... */
|
|
LogDebug("Connection %d: sending PING ...", i);
|
|
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) {
|
|
LogDebug
|
|
("Unregistered connection %d timed out ...",
|
|
i);
|
|
Conn_Close(i, NULL, "Timeout", false);
|
|
}
|
|
}
|
|
}
|
|
} /* Check_Connections */
|
|
|
|
|
|
static void
|
|
Check_Servers( void )
|
|
{
|
|
/* Check if we can establish further server links */
|
|
|
|
int i, n;
|
|
time_t time_now;
|
|
|
|
/* 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? */
|
|
time_now = time(NULL);
|
|
if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
|
|
continue;
|
|
|
|
/* Okay, try to connect now */
|
|
Conf_Server[i].lasttry = time_now;
|
|
Conf_Server[i].conn_id = SERVER_WAIT;
|
|
assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
|
|
Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
|
|
}
|
|
} /* Check_Servers */
|
|
|
|
|
|
static void
|
|
New_Server( int Server , ng_ipaddr_t *dest)
|
|
{
|
|
/* Establish new server link */
|
|
char ip_str[NG_INET_ADDRSTRLEN];
|
|
int af_dest, res, new_sock;
|
|
CLIENT *c;
|
|
|
|
assert( Server > NONE );
|
|
|
|
if (!ng_ipaddr_tostr_r(dest, ip_str)) {
|
|
Log(LOG_WARNING, "New_Server: Could not convert IP to string");
|
|
return;
|
|
}
|
|
|
|
Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
|
|
Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
|
|
|
|
af_dest = ng_ipaddr_af(dest);
|
|
new_sock = socket(af_dest, SOCK_STREAM, 0);
|
|
if (new_sock < 0) {
|
|
Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
|
|
return;
|
|
}
|
|
|
|
if (!Init_Socket(new_sock))
|
|
return;
|
|
|
|
/* is a bind address configured? */
|
|
res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
|
|
/* if yes, bind now. If it fails, warn and let connect() pick a source address */
|
|
if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
|
|
ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
|
|
{
|
|
ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
|
|
Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
|
|
}
|
|
ng_ipaddr_setport(dest, Conf_Server[Server].port);
|
|
res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
|
|
if(( res != 0 ) && ( errno != EINPROGRESS )) {
|
|
Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
|
|
close( new_sock );
|
|
return;
|
|
}
|
|
|
|
if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
|
|
Log(LOG_ALERT,
|
|
"Cannot allocate memory for server connection (socket %d)",
|
|
new_sock);
|
|
close( new_sock );
|
|
return;
|
|
}
|
|
|
|
My_Connections = array_start(&My_ConnArray);
|
|
|
|
assert(My_Connections[new_sock].sock <= 0);
|
|
|
|
Init_Conn_Struct(new_sock);
|
|
|
|
ng_ipaddr_tostr_r(dest, ip_str);
|
|
c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
|
|
if (!c) {
|
|
Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
|
|
close( new_sock );
|
|
return;
|
|
}
|
|
|
|
Client_SetIntroducer( c, c );
|
|
Client_SetToken( c, TOKEN_OUTBOUND );
|
|
|
|
/* Register connection */
|
|
Conf_Server[Server].conn_id = new_sock;
|
|
My_Connections[new_sock].sock = new_sock;
|
|
My_Connections[new_sock].addr = *dest;
|
|
My_Connections[new_sock].client = c;
|
|
strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
|
|
sizeof(My_Connections[new_sock].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( new_sock, "io_event_create() failed", NULL, false );
|
|
Init_Conn_Struct( new_sock );
|
|
Conf_Server[Server].conn_id = NONE;
|
|
}
|
|
|
|
LogDebug("Registered new connection %d on socket %d.",
|
|
new_sock, My_Connections[new_sock].sock );
|
|
Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
|
|
} /* New_Server */
|
|
|
|
|
|
/**
|
|
* Initialize connection structure.
|
|
*/
|
|
static void
|
|
Init_Conn_Struct(CONN_ID Idx)
|
|
{
|
|
time_t now = time(NULL);
|
|
|
|
memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
|
|
My_Connections[Idx].sock = -1;
|
|
My_Connections[Idx].signon = now;
|
|
My_Connections[Idx].lastdata = now;
|
|
My_Connections[Idx].lastprivmsg = now;
|
|
Resolve_Init(&My_Connections[Idx].res_stat);
|
|
} /* 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;
|
|
LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
|
|
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 */
|
|
|
|
|
|
|
|
static void
|
|
cb_Connect_to_Server(int fd, UNUSED short events)
|
|
{
|
|
/* Read result of resolver sub-process from pipe and start connection */
|
|
int i;
|
|
size_t len;
|
|
ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
|
|
four so we can log the 'more than we can handle'
|
|
condition */
|
|
|
|
LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
|
|
|
|
for (i=0; i < MAX_SERVERS; i++) {
|
|
if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
|
|
break;
|
|
}
|
|
|
|
if( i >= MAX_SERVERS) {
|
|
/* Ops, no matching server found?! */
|
|
io_close( fd );
|
|
LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
|
|
return;
|
|
}
|
|
|
|
/* Read result from pipe */
|
|
len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
|
|
if (len == 0)
|
|
return;
|
|
|
|
assert((len % sizeof(ng_ipaddr_t)) == 0);
|
|
|
|
LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
|
|
|
|
memset(&Conf_Server[i].dst_addr, 0, sizeof(&Conf_Server[i].dst_addr));
|
|
if (len > sizeof(ng_ipaddr_t)) {
|
|
/* more than one address for this hostname, remember them
|
|
* in case first address is unreachable/not available */
|
|
len -= sizeof(ng_ipaddr_t);
|
|
if (len > sizeof(&Conf_Server[i].dst_addr)) {
|
|
len = sizeof(&Conf_Server[i].dst_addr);
|
|
Log(LOG_NOTICE, "Notice: Resolver returned more IP Addresses for host than we can handle,"
|
|
" additional addresses dropped");
|
|
}
|
|
memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
|
|
}
|
|
/* connect() */
|
|
New_Server(i, dest_addrs);
|
|
} /* cb_Read_Forward_Lookup */
|
|
|
|
|
|
static void
|
|
cb_Read_Resolver_Result( int r_fd, UNUSED short events )
|
|
{
|
|
/* 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 i;
|
|
size_t len;
|
|
char *identptr;
|
|
#ifdef IDENTAUTH
|
|
char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
|
|
#else
|
|
char readbuf[HOST_LEN + 1];
|
|
#endif
|
|
|
|
LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
|
|
|
|
/* Search associated connection ... */
|
|
for( i = 0; i < Pool_Size; i++ ) {
|
|
if(( My_Connections[i].sock != NONE )
|
|
&& ( Resolve_Getfd(&My_Connections[i].res_stat) == 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 );
|
|
LogDebug("Resolver: Got callback for unknown connection!?");
|
|
return;
|
|
}
|
|
|
|
/* Read result from pipe */
|
|
len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
|
|
if (len == 0)
|
|
return;
|
|
|
|
readbuf[len] = '\0';
|
|
identptr = strchr(readbuf, '\n');
|
|
assert(identptr != NULL);
|
|
if (!identptr) {
|
|
Log( LOG_CRIT, "Resolver: Got malformed result!");
|
|
return;
|
|
}
|
|
|
|
*identptr = '\0';
|
|
LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
|
|
/* Okay, we got a complete result: this is a host name for outgoing
|
|
* connections and a host name and IDENT user name (if enabled) for
|
|
* incoming connections.*/
|
|
assert ( My_Connections[i].sock >= 0 );
|
|
/* Incoming connection. Search client ... */
|
|
c = Conn_GetClient( i );
|
|
assert( c != NULL );
|
|
|
|
/* Only update client information of unregistered clients */
|
|
if( Client_Type( c ) == CLIENT_UNKNOWN ) {
|
|
strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
|
|
Client_SetHostname( c, readbuf);
|
|
#ifdef IDENTAUTH
|
|
++identptr;
|
|
if (*identptr) {
|
|
Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
|
|
Client_SetUser(c, identptr, true);
|
|
} else {
|
|
Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
|
|
}
|
|
#endif
|
|
}
|
|
#ifdef DEBUG
|
|
else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
|
|
#endif
|
|
/* Reset penalty time */
|
|
Conn_ResetPenalty( i );
|
|
} /* cb_Read_Resolver_Result */
|
|
|
|
|
|
static void
|
|
Simple_Message( int Sock, const char *Msg )
|
|
{
|
|
char buf[COMMAND_LEN];
|
|
size_t 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);
|
|
len = strlcat( buf, "\r\n", sizeof buf);
|
|
(void)write(Sock, buf, len);
|
|
} /* Simple_Error */
|
|
|
|
|
|
GLOBAL CLIENT *
|
|
Conn_GetClient( CONN_ID Idx )
|
|
{
|
|
/* return Client-Structure that belongs to the local Connection Idx.
|
|
* If none is found, return NULL.
|
|
*/
|
|
CONNECTION *c;
|
|
assert( Idx >= 0 );
|
|
|
|
c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
|
|
|
|
assert(c != NULL);
|
|
|
|
return c ? c->client : NULL;
|
|
}
|
|
|
|
/* -eof- */
|