/* * ngIRCd -- The Next Generation IRC Daemon * Copyright (c)2001-2005 Alexander Barton * * 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 1.156 2005/07/02 14:36:03 alex Exp $"; #include "imp.h" #include #ifdef PROTOTYPES # include #else # include #endif #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_NETINET_IP_H # include #endif #ifdef HAVE_ARPA_INET_H # include #else # define PF_INET AF_INET #endif #ifdef HAVE_STDINT_H # include /* e.g. for Mac OS X */ #endif #ifdef TCPWRAP # include /* 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_ThisServer( ), NOTICE_TXTPREFIX, (double)My_Connections[Idx].bytes_in / 1024, (double)My_Connections[Idx].bytes_out / 1024 ); } #endif /* Send ERROR to client (see RFC!) */ if( FwdMsg ) Conn_WriteStr( Idx, "ERROR :%s", FwdMsg ); else Conn_WriteStr( Idx, "ERROR :Closing connection." ); } /* Try to write out the write buffer */ (void)Handle_Write( Idx ); /* Shut down socket */ if( 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 )); /* Fehler aufgetreten? */ if(( res != 0 ) || ( err != 0 )) { /* Fehler! */ if( res != 0 ) Log( LOG_CRIT, "getsockopt (connection %d): %s!", Idx, strerror( errno )); else Log( LOG_CRIT, "Can't connect socket to \"%s:%d\" (connection %d): %s!", My_Connections[Idx].host, Conf_Server[Conf_GetServer( Idx )].port, Idx, strerror( err )); /* Clean up socket, connection and client structures */ FD_CLR( My_Connections[Idx].sock, &My_Sockets ); c = Client_GetFromConn( Idx ); if( c ) Client_DestroyNow( c ); close( My_Connections[Idx].sock ); Init_Conn_Struct( Idx ); /* Bei Server-Verbindungen lasttry-Zeitpunkt auf "jetzt" setzen */ Conf_Server[Conf_GetServer( Idx )].lasttry = time( NULL ); Conf_UnsetServer( Idx ); return 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- */