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- /*
- * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2005 Alexander Barton <alex@barton.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * Please read the file COPYING, README and AUTHORS for more information.
- *
- * Connection management
- */
- #define CONN_MODULE
- #include "portab.h"
- static char UNUSED id[] = "$Id: conn.c,v 1.155.2.3 2005/10/11 19:28:47 alex Exp $";
- #include "imp.h"
- #include <assert.h>
- #ifdef PROTOTYPES
- # include <stdarg.h>
- #else
- # include <varargs.h>
- #endif
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <string.h>
- #include <sys/socket.h>
- #include <sys/time.h>
- #include <sys/types.h>
- #include <time.h>
- #include <netinet/in.h>
- #ifdef HAVE_NETINET_IP_H
- # include <netinet/ip.h>
- #endif
- #ifdef HAVE_ARPA_INET_H
- # include <arpa/inet.h>
- #else
- # define PF_INET AF_INET
- #endif
- #ifdef HAVE_STDINT_H
- # include <stdint.h> /* e.g. for Mac OS X */
- #endif
- #ifdef TCPWRAP
- # include <tcpd.h> /* for TCP Wrappers */
- #endif
- #include "defines.h"
- #include "resolve.h"
- #include "exp.h"
- #include "conn.h"
- #include "imp.h"
- #include "ngircd.h"
- #include "client.h"
- #include "conf.h"
- #include "conn-zip.h"
- #include "conn-func.h"
- #include "log.h"
- #include "parse.h"
- #include "tool.h"
- #ifdef RENDEZVOUS
- # include "rendezvous.h"
- #endif
- #include "exp.h"
- #define SERVER_WAIT (NONE - 1)
- LOCAL void Handle_Read PARAMS(( int sock ));
- LOCAL bool Handle_Write PARAMS(( CONN_ID Idx ));
- LOCAL void New_Connection PARAMS(( int Sock ));
- LOCAL CONN_ID Socket2Index PARAMS(( int Sock ));
- LOCAL void Read_Request PARAMS(( CONN_ID Idx ));
- LOCAL bool Handle_Buffer PARAMS(( CONN_ID Idx ));
- LOCAL void Check_Connections PARAMS(( void ));
- LOCAL void Check_Servers PARAMS(( void ));
- LOCAL void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
- LOCAL bool Init_Socket PARAMS(( int Sock ));
- LOCAL void New_Server PARAMS(( int Server, CONN_ID Idx ));
- LOCAL void Read_Resolver_Result PARAMS(( int r_fd ));
- LOCAL void Simple_Message PARAMS(( int Sock, char *Msg ));
- LOCAL int Count_Connections PARAMS(( struct sockaddr_in addr ));
- LOCAL fd_set My_Listeners;
- LOCAL fd_set My_Sockets;
- #ifdef TCPWRAP
- int allow_severity = LOG_INFO;
- int deny_severity = LOG_ERR;
- #endif
- LOCAL void
- FreeRes_stat( CONNECTION *c )
- {
- assert( c != NULL );
- assert( c->res_stat != NULL );
- if (!c->res_stat) return;
- FD_CLR( c->res_stat->pipe[0], &Resolver_FDs );
- close( c->res_stat->pipe[0] );
- close( c->res_stat->pipe[1] );
- free( c->res_stat );
- c->res_stat = NULL;
- }
- GLOBAL void
- Conn_Init( void )
- {
- /* Modul initialisieren: statische Strukturen "ausnullen". */
- CONN_ID i;
- /* Speicher fuer Verbindungs-Pool anfordern */
- Pool_Size = CONNECTION_POOL;
- if( Conf_MaxConnections > 0 )
- {
- /* konfiguriertes Limit beachten */
- if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
- }
- My_Connections = (CONNECTION *) calloc( Pool_Size, sizeof( CONNECTION ) );
- if( ! My_Connections )
- {
- /* Speicher konnte nicht alloziert werden! */
- Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
- exit( 1 );
- }
- #ifdef DEBUG
- Log( LOG_DEBUG, "Allocated connection pool for %d items (%ld bytes).", Pool_Size, sizeof( CONNECTION ) * Pool_Size );
- #endif
- /* zu Beginn haben wir keine Verbindungen */
- FD_ZERO( &My_Listeners );
- FD_ZERO( &My_Sockets );
- /* Groesster File-Descriptor fuer select() */
- Conn_MaxFD = 0;
- /* Connection-Struktur initialisieren */
- for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
- /* Global write counter */
- WCounter = 0;
- } /* Conn_Init */
- GLOBAL void
- Conn_Exit( void )
- {
- /* Modul abmelden: alle noch offenen Connections
- * schliessen und freigeben. */
- CONN_ID idx;
- int i;
- #ifdef DEBUG
- Log( LOG_DEBUG, "Shutting down all connections ..." );
- #endif
- #ifdef RENDEZVOUS
- Rendezvous_UnregisterListeners( );
- #endif
- /* Sockets schliessen */
- for( i = 0; i < Conn_MaxFD + 1; i++ )
- {
- if( FD_ISSET( i, &My_Sockets ))
- {
- for( idx = 0; idx < Pool_Size; idx++ )
- {
- if( My_Connections[idx].sock == i ) break;
- }
- if( FD_ISSET( i, &My_Listeners ))
- {
- close( i );
- #ifdef DEBUG
- Log( LOG_DEBUG, "Listening socket %d closed.", i );
- #endif
- }
- else if( idx < Pool_Size )
- {
- if( NGIRCd_SignalRestart ) Conn_Close( idx, NULL, "Server going down (restarting)", true );
- else Conn_Close( idx, NULL, "Server going down", true );
- }
- else
- {
- Log( LOG_WARNING, "Closing unknown connection %d ...", i );
- close( i );
- }
- }
- }
- free( My_Connections );
- My_Connections = NULL;
- Pool_Size = 0;
- } /* Conn_Exit */
- GLOBAL int
- Conn_InitListeners( void )
- {
- /* Initialize ports on which the server should accept connections */
- int created, i;
- created = 0;
- for( i = 0; i < Conf_ListenPorts_Count; i++ )
- {
- if( Conn_NewListener( Conf_ListenPorts[i] )) created++;
- else Log( LOG_ERR, "Can't listen on port %u!", (unsigned int) Conf_ListenPorts[i] );
- }
- return created;
- } /* Conn_InitListeners */
- GLOBAL void
- Conn_ExitListeners( void )
- {
- /* Close down all listening sockets */
- int i;
- #ifdef RENDEZVOUS
- Rendezvous_UnregisterListeners( );
- #endif
- Log( LOG_INFO, "Shutting down all listening sockets ..." );
- for( i = 0; i < Conn_MaxFD + 1; i++ )
- {
- if( FD_ISSET( i, &My_Sockets ) && FD_ISSET( i, &My_Listeners ))
- {
- close( i );
- #ifdef DEBUG
- Log( LOG_DEBUG, "Listening socket %d closed.", i );
- #endif
- }
- }
- } /* Conn_ExitListeners */
- GLOBAL bool
- Conn_NewListener( const UINT16 Port )
- {
- /* Create new listening socket on specified port */
- struct sockaddr_in addr;
- struct in_addr inaddr;
- int sock;
- #ifdef RENDEZVOUS
- char name[CLIENT_ID_LEN], *info;
- #endif
- /* Server-"Listen"-Socket initialisieren */
- memset( &addr, 0, sizeof( addr ));
- memset( &inaddr, 0, sizeof( inaddr ));
- addr.sin_family = AF_INET;
- addr.sin_port = htons( Port );
- if( Conf_ListenAddress[0] )
- {
- #ifdef HAVE_INET_ATON
- if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
- #else
- inaddr.s_addr = inet_addr( Conf_ListenAddress );
- if( inaddr.s_addr == (unsigned)-1 )
- #endif
- {
- Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!", Conf_ListenAddress, Port, Conf_ListenAddress );
- return false;
- }
- }
- else inaddr.s_addr = htonl( INADDR_ANY );
- addr.sin_addr = inaddr;
- /* Socket erzeugen */
- sock = socket( PF_INET, SOCK_STREAM, 0);
- if( sock < 0 )
- {
- Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
- return false;
- }
- if( ! Init_Socket( sock )) return false;
- /* an Port binden */
- if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 )
- {
- Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno ));
- close( sock );
- return false;
- }
- /* in "listen mode" gehen :-) */
- if( listen( sock, 10 ) != 0 )
- {
- Log( LOG_CRIT, "Can't listen on soecket: %s!", strerror( errno ));
- close( sock );
- return false;
- }
- /* Neuen Listener in Strukturen einfuegen */
- FD_SET( sock, &My_Listeners );
- FD_SET( sock, &My_Sockets );
- if( sock > Conn_MaxFD ) Conn_MaxFD = sock;
- if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
- else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
- #ifdef RENDEZVOUS
- /* Get best server description text */
- if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
- else
- {
- /* Use server info string */
- info = NULL;
- if( Conf_ServerInfo[0] == '[' )
- {
- /* Cut off leading hostname part in "[]" */
- info = strchr( Conf_ServerInfo, ']' );
- if( info )
- {
- info++;
- while( *info == ' ' ) info++;
- }
- }
- if( ! info ) info = Conf_ServerInfo;
- }
- /* Add port number to description if non-standard */
- if( Port != 6667 ) snprintf( name, sizeof( name ), "%s (port %u)", info, Port );
- else strlcpy( name, info, sizeof( name ));
- /* Register service */
- Rendezvous_Register( name, RENDEZVOUS_TYPE, Port );
- #endif
- return true;
- } /* Conn_NewListener */
- GLOBAL void
- Conn_Handler( void )
- {
- /* "Hauptschleife": Aktive Verbindungen ueberwachen. Folgende Aktionen
- * werden dabei durchgefuehrt, bis der Server terminieren oder neu
- * starten soll:
- *
- * - neue Verbindungen annehmen,
- * - Server-Verbindungen aufbauen,
- * - geschlossene Verbindungen loeschen,
- * - volle Schreibpuffer versuchen zu schreiben,
- * - volle Lesepuffer versuchen zu verarbeiten,
- * - Antworten von Resolver Sub-Prozessen annehmen.
- */
- fd_set read_sockets, write_sockets;
- struct timeval tv;
- time_t start, t;
- CONN_ID i, idx;
- bool timeout;
- start = time( NULL );
- while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart ))
- {
- timeout = true;
- #ifdef RENDEZVOUS
- Rendezvous_Handler( );
- #endif
- /* Should the configuration be reloaded? */
- if( NGIRCd_SignalRehash ) NGIRCd_Rehash( );
- /* Check configured servers and established links */
- Check_Servers( );
- Check_Connections( );
- t = time( NULL );
- /* noch volle Lese-Buffer suchen */
- for( i = 0; i < Pool_Size; i++ )
- {
- if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].rdatalen > 0 ) &&
- ( My_Connections[i].delaytime < t ))
- {
- /* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
- if( Handle_Buffer( i )) timeout = false;
- }
- }
- /* noch volle Schreib-Puffer suchen */
- FD_ZERO( &write_sockets );
- for( i = 0; i < Pool_Size; i++ )
- {
- #ifdef ZLIB
- if(( My_Connections[i].sock > NONE ) && (( My_Connections[i].wdatalen > 0 ) || ( My_Connections[i].zip.wdatalen > 0 )))
- #else
- if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].wdatalen > 0 ))
- #endif
- {
- /* Socket der Verbindung in Set aufnehmen */
- FD_SET( My_Connections[i].sock, &write_sockets );
- }
- }
- /* Sockets mit im Aufbau befindlichen ausgehenden Verbindungen suchen */
- for( i = 0; i < Pool_Size; i++ )
- {
- if ( My_Connections[i].sock > NONE ) {
- if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING )) {
- FD_SET( My_Connections[i].sock, &write_sockets );
- }
- }
- }
- /* von welchen Sockets koennte gelesen werden? */
- read_sockets = My_Sockets;
- for( i = 0; i < Pool_Size; i++ )
- {
- if ( My_Connections[i].sock > NONE ) {
- if ( My_Connections[i].res_stat ) {
- /* wait for completion of Resolver Sub-Process */
- FD_CLR( My_Connections[i].sock, &read_sockets );
- continue;
- }
- if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING )) {
- /* wait for completion of connect() */
- FD_CLR( My_Connections[i].sock, &read_sockets );
- continue;
- }
- }
- if( My_Connections[i].delaytime > t )
- {
- /* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
- FD_CLR( My_Connections[i].sock, &read_sockets );
- }
- }
- for( i = 0; i < Conn_MaxFD + 1; i++ )
- {
- /* Pipes von Resolver Sub-Prozessen aufnehmen */
- if( FD_ISSET( i, &Resolver_FDs ))
- {
- FD_SET( i, &read_sockets );
- }
- }
- /* Timeout initialisieren */
- tv.tv_usec = 0;
- if( timeout ) tv.tv_sec = 1;
- else tv.tv_sec = 0;
- /* Auf Aktivitaet warten */
- i = select( Conn_MaxFD + 1, &read_sockets, &write_sockets, NULL, &tv );
- if( i == 0 )
- {
- /* keine Veraenderung an den Sockets */
- continue;
- }
- if( i == -1 )
- {
- /* Fehler (z.B. Interrupt) */
- if( errno != EINTR )
- {
- Log( LOG_EMERG, "Conn_Handler(): select(): %s!", strerror( errno ));
- Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
- exit( 1 );
- }
- continue;
- }
- /* Koennen Daten geschrieben werden? */
- for( i = 0; i < Conn_MaxFD + 1; i++ )
- {
- if( ! FD_ISSET( i, &write_sockets )) continue;
- /* Es kann geschrieben werden ... */
- idx = Socket2Index( i );
- if( idx == NONE ) continue;
- if( ! Handle_Write( idx ))
- {
- /* Fehler beim Schreiben! Diesen Socket nun
- * auch aus dem Read-Set entfernen: */
- FD_CLR( i, &read_sockets );
- }
- }
- /* Daten zum Lesen vorhanden? */
- for( i = 0; i < Conn_MaxFD + 1; i++ )
- {
- if( FD_ISSET( i, &read_sockets )) Handle_Read( i );
- }
- }
- if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
- else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
- } /* Conn_Handler */
- /**
- * Write a text string into the socket of a connection.
- * This function automatically appends CR+LF to the string and validates that
- * the result is a valid IRC message (oversized messages are shortened, for
- * example). Then it calls the Conn_Write() function to do the actual sending.
- * @param Idx Index fo the connection.
- * @param Format Format string, see printf().
- * @return true on success, false otherwise.
- */
- #ifdef PROTOTYPES
- GLOBAL bool
- Conn_WriteStr( CONN_ID Idx, char *Format, ... )
- #else
- GLOBAL bool
- Conn_WriteStr( Idx, Format, va_alist )
- CONN_ID Idx;
- char *Format;
- va_dcl
- #endif
- {
- char buffer[COMMAND_LEN];
- bool ok;
- va_list ap;
- assert( Idx > NONE );
- assert( Format != NULL );
- #ifdef PROTOTYPES
- va_start( ap, Format );
- #else
- va_start( ap );
- #endif
- if (vsnprintf(buffer, COMMAND_LEN - 2, Format, ap) >= COMMAND_LEN - 2) {
- /*
- * The string that should be written to the socket is longer
- * than the allowed size of COMMAND_LEN bytes (including both
- * the CR and LF characters). This can be caused by the
- * IRC_WriteXXX() functions when the prefix of this server had
- * to be added to an already "quite long" command line which
- * has been received from a regular IRC client, for example.
- *
- * We are not allowed to send such "oversized" messages to
- * other servers and clients, see RFC 2812 2.3 and 2813 3.3
- * ("these messages SHALL NOT exceed 512 characters in length,
- * counting all characters including the trailing CR-LF").
- *
- * So we have a big problem here: we should send more bytes
- * to the network than we are allowed to and we don't know
- * the originator (any more). The "old" behaviour of blaming
- * the receiver ("next hop") is a bad idea (it could be just
- * an other server only routing the message!), so the only
- * option left is to shorten the string and to hope that the
- * result is still somewhat useful ...
- * -alex-
- */
- strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
- CUT_TXTSUFFIX);
- }
- #ifdef SNIFFER
- if (NGIRCd_Sniffer)
- Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
- #endif
- strlcat( buffer, "\r\n", sizeof( buffer ));
- ok = Conn_Write( Idx, buffer, strlen( buffer ));
- My_Connections[Idx].msg_out++;
- va_end( ap );
- return ok;
- } /* Conn_WriteStr */
- GLOBAL bool
- Conn_Write( CONN_ID Idx, char *Data, 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( WRITEBUFFER_LEN - My_Connections[Idx].wdatalen - Len <= 0 )
- {
- /* 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;
- /* nun neu pruefen: */
- if( WRITEBUFFER_LEN - My_Connections[Idx].wdatalen - Len <= 0 )
- {
- 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 */
- memcpy( My_Connections[Idx].wbuf + My_Connections[Idx].wdatalen, Data, Len );
- My_Connections[Idx].wdatalen += Len;
- 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_ID(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. 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 = Client_GetFromConn( Idx );
- /* Shut down socket */
- if( close( My_Connections[Idx].sock ) != 0 )
- {
- /* 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: */
- FD_CLR( My_Connections[Idx].sock, &My_Sockets );
- 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 );
- }
- #endif
- /* 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 void
- Handle_Read( int Sock )
- {
- /* Aktivitaet auf einem Socket verarbeiten:
- * - neue Clients annehmen,
- * - Daten von Clients verarbeiten,
- * - Resolver-Rueckmeldungen annehmen. */
- CONN_ID idx;
- assert( Sock > NONE );
- if( FD_ISSET( Sock, &My_Listeners ))
- {
- /* es ist einer unserer Listener-Sockets: es soll
- * also eine neue Verbindung aufgebaut werden. */
- New_Connection( Sock );
- }
- else if( FD_ISSET( Sock, &Resolver_FDs ))
- {
- /* Rueckmeldung von einem Resolver Sub-Prozess */
- Read_Resolver_Result( Sock );
- }
- else
- {
- /* Ein Client Socket: entweder ein User oder Server */
- idx = Socket2Index( Sock );
- if( idx > NONE ) Read_Request( idx );
- }
- } /* Handle_Read */
- LOCAL bool
- Handle_Write( CONN_ID Idx )
- {
- /* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */
- int len, res, err;
- socklen_t sock_len;
- CLIENT *c;
- assert( Idx > NONE );
- assert( My_Connections[Idx].sock > NONE );
- if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCONNECTING )) {
- /* connect() has finished, check result */
- Conn_OPTION_DEL( &My_Connections[Idx], CONN_ISCONNECTING );
- /* Ergebnis des connect() ermitteln */
- sock_len = sizeof( err );
- res = getsockopt( My_Connections[Idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
- assert( sock_len == sizeof( err ));
- /* Error while connecting? */
- if ((res != 0) || (err != 0)) {
- if (res != 0)
- Log(LOG_CRIT, "getsockopt (connection %d): %s!",
- Idx, strerror(errno));
- else
- Log(LOG_CRIT,
- "Can't connect socket to \"%s:%d\" (connection %d): %s!",
- My_Connections[Idx].host,
- Conf_Server[Conf_GetServer(Idx)].port,
- Idx, strerror(err));
- /* Clean up the CLIENT structure (to avoid silly log
- * messages) and call Conn_Close() to do the rest. */
- c = Client_GetFromConn(Idx);
- if (c)
- Client_DestroyNow(c);
- Conn_Close(Idx, "Can't connect!", NULL, false);
- /* Set the timestamp of the last connect attempt */
- Conf_UnsetServer(Idx);
- return false;
- }
- Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", Idx, My_Connections[Idx].host, Conf_Server[Conf_GetServer( Idx )].port );
- /* Send PASS and SERVER command to peer */
- Conn_WriteStr( Idx, "PASS %s %s", Conf_Server[Conf_GetServer( Idx )].pwd_out, NGIRCd_ProtoID );
- return Conn_WriteStr( Idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
- }
- #ifdef ZLIB
- if(( My_Connections[Idx].wdatalen <= 0 ) && ( ! My_Connections[Idx].zip.wdatalen ))
- return true;
- /* write buffer empty, but not compression buf? -> flush compression buf. */
- if( My_Connections[Idx].wdatalen == 0 ) Zip_Flush( Idx );
- #else
- if( My_Connections[Idx].wdatalen <= 0 )
- return true;
- #endif
- len = write( My_Connections[Idx].sock, My_Connections[Idx].wbuf, My_Connections[Idx].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;
- }
- /* Update buffer len and move any data not yet written to beginning of buf */
- My_Connections[Idx].wdatalen -= len;
- memmove( My_Connections[Idx].wbuf, My_Connections[Idx].wbuf + len, My_Connections[Idx].wdatalen );
- 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 */
- FD_SET( new_sock, &My_Sockets );
- if( new_sock > Conn_MaxFD ) Conn_MaxFD = new_sock;
- 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. */
- int len, bsize;
- #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(( bsize - My_Connections[Idx].rdatalen - 1 < 1 ) || ( ZREADBUFFER_LEN - My_Connections[Idx].zip.rdatalen < 1 ))
- #else
- if( bsize - My_Connections[Idx].rdatalen - 1 < 1 )
- #endif
- {
- /* Der Lesepuffer ist voll */
- Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx, My_Connections[Idx].rdatalen );
- Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
- return;
- }
- #ifdef ZLIB
- if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
- len = recv( My_Connections[Idx].sock, My_Connections[Idx].zip.rbuf + My_Connections[Idx].zip.rdatalen, ( ZREADBUFFER_LEN - My_Connections[Idx].zip.rdatalen ), 0 );
- if( len > 0 ) My_Connections[Idx].zip.rdatalen += len;
- }
- else
- #endif
- {
- len = recv( My_Connections[Idx].sock, My_Connections[Idx].rbuf + My_Connections[Idx].rdatalen, bsize - My_Connections[Idx].rdatalen - 1, 0 );
- if( len > 0 ) My_Connections[Idx].rdatalen += len;
- }
- if( len == 0 )
- {
- /* Socket wurde geschlossen */
- 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 )
- {
- /* Operation haette Socket "nur" blockiert ... */
- if( errno == EAGAIN ) return;
- /* Fehler beim Lesen */
- 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;
- }
- /* 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 )
- {
- /* Daten im Lese-Puffer einer Verbindung verarbeiten.
- * Wurde ein Request verarbeitet, so wird true geliefert,
- * ansonsten false (auch bei Fehlern). */
- #ifndef STRICT_RFC
- char *ptr1, *ptr2;
- #endif
- char *ptr;
- int len, delta;
- 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
- /* ggf. noch unkomprimiete Daten weiter entpacken */
- if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
- if( ! Unzip_Buffer( Idx )) return false;
- #endif
- if( My_Connections[Idx].rdatalen < 1 ) break;
- /* Eine komplette Anfrage muss mit CR+LF enden, vgl.
- * RFC 2812. Haben wir eine? */
- My_Connections[Idx].rbuf[My_Connections[Idx].rdatalen] = '\0';
- ptr = strstr( My_Connections[Idx].rbuf, "\r\n" );
- if( ptr ) delta = 2;
- #ifndef STRICT_RFC
- else
- {
- /* Nicht RFC-konforme Anfrage mit nur CR oder LF? Leider
- * machen soetwas viele Clients, u.a. "mIRC" :-( */
- ptr1 = strchr( My_Connections[Idx].rbuf, '\r' );
- ptr2 = strchr( 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 )
- {
- /* Ende der Anfrage wurde gefunden */
- *ptr = '\0';
- len = ( ptr - My_Connections[Idx].rbuf ) + delta;
- if( len > ( COMMAND_LEN - 1 ))
- {
- /* Eine Anfrage darf(!) nicht laenger als 512 Zeichen
- * (incl. CR+LF!) werden; vgl. RFC 2812. Wenn soetwas
- * empfangen wird, wird der Client disconnectiert. */
- Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!", Idx, My_Connections[Idx].rdatalen, COMMAND_LEN - 1 );
- Conn_Close( Idx, NULL, "Request too long", true );
- return false;
- }
- #ifdef ZLIB
- /* merken, ob Stream bereits komprimiert wird */
- old_z = My_Connections[Idx].options & CONN_ZIP;
- #endif
- if( len > delta )
- {
- /* Es wurde ein Request gelesen */
- My_Connections[Idx].msg_in++;
- if( ! Parse_Request( Idx, My_Connections[Idx].rbuf )) return false;
- else action = true;
- }
- /* Puffer anpassen */
- My_Connections[Idx].rdatalen -= len;
- memmove( My_Connections[Idx].rbuf, My_Connections[Idx].rbuf + len, My_Connections[Idx].rdatalen );
- #ifdef ZLIB
- if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) && ( My_Connections[Idx].rdatalen > 0 ))
- {
- /* Mit dem letzten Befehl wurde Socket-Kompression aktiviert.
- * Evtl. schon vom Socket gelesene Daten in den Unzip-Puffer
- * umkopieren, damit diese nun zunaechst entkomprimiert werden */
- if( My_Connections[Idx].rdatalen > ZREADBUFFER_LEN )
- {
- /* Hupsa! Soviel Platz haben wir aber gar nicht! */
- Log( LOG_ALERT, "Can't move receive buffer: No space left in unzip buffer (need %d bytes)!", My_Connections[Idx].rdatalen );
- return false;
- }
- memcpy( My_Connections[Idx].zip.rbuf, My_Connections[Idx].rbuf, My_Connections[Idx].rdatalen );
- My_Connections[Idx].zip.rdatalen = My_Connections[Idx].rdatalen;
- My_Connections[Idx].rdatalen = 0;
- #ifdef DEBUG
- Log( LOG_DEBUG, "Moved already received data (%d bytes) to uncompression buffer.", My_Connections[Idx].zip.rdatalen );
- #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 */
- FD_SET( new_sock, &My_Sockets );
- Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCONNECTING );
- if( new_sock > Conn_MaxFD ) Conn_MaxFD = new_sock;
- #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;
- #ifdef O_NONBLOCK /* unknown on A/UX */
- if( fcntl( Sock, F_SETFL, O_NONBLOCK ) != 0 )
- {
- Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
- close( Sock );
- return false;
- }
- #endif
- /* 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 */
- LOCAL 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;
- /* 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 ... */
- FD_CLR( r_fd, &Resolver_FDs );
- 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- */
|