2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2005 Alexander Barton <alex@barton.de>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 * Please read the file COPYING, README and AUTHORS for more information.
11 * Connection management
20 static char UNUSED id[] = "$Id: conn.c,v 1.190 2006/02/16 19:21:57 fw Exp $";
34 #include <sys/socket.h>
36 #include <sys/types.h>
38 #include <netinet/in.h>
40 #ifdef HAVE_NETINET_IP_H
41 # include <netinet/ip.h>
44 #ifdef HAVE_ARPA_INET_H
45 # include <arpa/inet.h>
47 # define PF_INET AF_INET
51 # include <stdint.h> /* e.g. for Mac OS X */
55 # include <tcpd.h> /* for TCP Wrappers */
70 #include "conn-func.h"
76 # include "rendezvous.h"
82 #define SERVER_WAIT (NONE - 1)
85 static bool Handle_Write PARAMS(( CONN_ID Idx ));
86 static int New_Connection PARAMS(( int Sock ));
87 static CONN_ID Socket2Index PARAMS(( int Sock ));
88 static void Read_Request PARAMS(( CONN_ID Idx ));
89 static bool Handle_Buffer PARAMS(( CONN_ID Idx ));
90 static void Check_Connections PARAMS(( void ));
91 static void Check_Servers PARAMS(( void ));
92 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
93 static bool Init_Socket PARAMS(( int Sock ));
94 static void New_Server PARAMS(( int Server ));
95 static void Simple_Message PARAMS(( int Sock, char *Msg ));
96 static int Count_Connections PARAMS(( struct sockaddr_in addr ));
97 static int NewListener PARAMS(( const UINT16 Port ));
99 static array My_Listeners;
100 static array My_ConnArray;
103 int allow_severity = LOG_INFO;
104 int deny_severity = LOG_ERR;
107 static void server_login PARAMS((CONN_ID idx));
109 static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what));
110 static void cb_Connect_to_Server PARAMS(( int sock, UNUSED short what));
111 static void cb_clientserver PARAMS((int sock, short what));
114 cb_listen(int sock, short irrelevant)
117 New_Connection( sock );
122 cb_connserver(int sock, UNUSED short what)
127 CONN_ID idx = Socket2Index( sock );
129 LogDebug("cb_connserver wants to write on unknown socket?!");
134 assert( what & IO_WANTWRITE);
136 /* connect() finished, get result. */
137 sock_len = sizeof( err );
138 res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
139 assert( sock_len == sizeof( err ));
141 /* Error while connecting? */
142 if ((res != 0) || (err != 0)) {
144 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
145 idx, strerror(errno));
148 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
149 My_Connections[idx].host,
150 Conf_Server[Conf_GetServer(idx)].port,
153 /* Clean up the CLIENT structure (to avoid silly log
154 * messages) and call Conn_Close() to do the rest. */
155 c = Client_GetFromConn(idx);
157 Client_DestroyNow(c);
159 Conn_Close(idx, "Can't connect!", NULL, false);
164 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
170 server_login(CONN_ID idx)
172 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
173 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
175 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
176 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
178 /* Send PASS and SERVER command to peer */
179 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
180 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
185 cb_clientserver(int sock, short what)
187 CONN_ID idx = Socket2Index( sock );
190 Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
196 if (what & IO_WANTREAD)
199 if (what & IO_WANTWRITE)
207 /* Modul initialisieren: statische Strukturen "ausnullen". */
211 /* Speicher fuer Verbindungs-Pool anfordern */
212 Pool_Size = CONNECTION_POOL;
213 if( Conf_MaxConnections > 0 )
215 /* konfiguriertes Limit beachten */
216 if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
219 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), Pool_Size)) {
220 Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
224 /* XXX: My_Connetions/Pool_Size are needed by other parts of the code; remove them */
225 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
227 LogDebug("Allocated connection pool for %d items (%ld bytes).",
228 array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
230 assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
232 array_free( &My_Listeners );
234 /* Connection-Struktur initialisieren */
235 for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
237 /* Global write counter */
245 /* Modul abmelden: alle noch offenen Connections
246 * schliessen und freigeben. */
250 LogDebug("Shutting down all connections ..." );
252 Conn_ExitListeners();
254 /* Sockets schliessen */
255 for( idx = 0; idx < Pool_Size; idx++ ) {
256 if( My_Connections[idx].sock > NONE ) {
257 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
258 "Server going down (restarting)":"Server going down", true );
262 array_free(&My_ConnArray);
263 My_Connections = NULL;
265 io_library_shutdown();
270 ports_initlisteners(array *a, void (*func)(int,short))
272 unsigned int created = 0, len;
276 len = array_length(a, sizeof (UINT16));
277 port = array_start(a);
279 fd = NewListener( *port );
284 if (!io_event_create( fd, IO_WANTREAD, func )) {
285 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
286 fd, (unsigned int) *port, strerror(errno));
300 Conn_InitListeners( void )
302 /* Initialize ports on which the server should accept connections */
304 unsigned int created;
306 if (!io_library_init(CONNECTION_POOL)) {
307 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
311 created = ports_initlisteners(&Conf_ListenPorts, cb_listen);
314 } /* Conn_InitListeners */
318 Conn_ExitListeners( void )
320 /* Close down all listening sockets */
324 Rendezvous_UnregisterListeners( );
327 arraylen = array_length(&My_Listeners, sizeof (int));
328 Log( LOG_INFO, "Shutting down all listening sockets (%d total)...", arraylen );
329 fd = array_start(&My_Listeners);
334 LogDebug("Listening socket %d closed.", *fd );
337 array_free(&My_Listeners);
338 } /* Conn_ExitListeners */
341 /* return new listening port file descriptor or -1 on failure */
343 NewListener( const UINT16 Port )
345 /* Create new listening socket on specified port */
347 struct sockaddr_in addr;
348 struct in_addr inaddr;
351 char name[CLIENT_ID_LEN], *info;
354 /* Server-"Listen"-Socket initialisieren */
355 memset( &addr, 0, sizeof( addr ));
356 memset( &inaddr, 0, sizeof( inaddr ));
357 addr.sin_family = AF_INET;
358 addr.sin_port = htons( Port );
359 if( Conf_ListenAddress[0] )
361 #ifdef HAVE_INET_ATON
362 if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
364 inaddr.s_addr = inet_addr( Conf_ListenAddress );
365 if( inaddr.s_addr == (unsigned)-1 )
368 Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!",
369 Conf_ListenAddress, Port, Conf_ListenAddress );
373 else inaddr.s_addr = htonl( INADDR_ANY );
374 addr.sin_addr = inaddr;
376 sock = socket( PF_INET, SOCK_STREAM, 0);
378 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
382 if( ! Init_Socket( sock )) return -1;
384 if( bind( sock, (struct sockaddr *)&addr, (socklen_t)sizeof( addr )) != 0 ) {
385 Log( LOG_CRIT, "Can't bind socket: %s!", strerror( errno ));
390 if( listen( sock, 10 ) != 0 ) {
391 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
396 /* keep fd in list so we can close it when ngircd restarts/shuts down */
397 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
398 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
403 if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
404 else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
407 /* Get best server description text */
408 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
411 /* Use server info string */
413 if( Conf_ServerInfo[0] == '[' )
415 /* Cut off leading hostname part in "[]" */
416 info = strchr( Conf_ServerInfo, ']' );
420 while( *info == ' ' ) info++;
423 if( ! info ) info = Conf_ServerInfo;
426 /* Add port number to description if non-standard */
427 if( Port != 6667 ) snprintf( name, sizeof( name ), "%s (port %u)", info, Port );
428 else strlcpy( name, info, sizeof( name ));
430 /* Register service */
431 Rendezvous_Register( name, MDNS_TYPE, Port );
440 /* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
441 * Call io_dispatch() to check for read/writeable sockets every second
442 * Wait for status change on pending connections (e.g: when the hostname has been resolved)
443 * check for penalty/timeouts
444 * handle input buffers
447 unsigned int wdatalen;
452 while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) {
456 Rendezvous_Handler( );
459 /* Should the configuration be reloaded? */
460 if (NGIRCd_SignalRehash) {
464 /* Check configured servers and established links */
466 Check_Connections( );
470 /* noch volle Lese-Buffer suchen */
471 for( i = 0; i < Pool_Size; i++ ) {
472 if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
473 ( My_Connections[i].delaytime < t ))
475 /* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
476 if (Handle_Buffer( i )) timeout = false;
480 /* noch volle Schreib-Puffer suchen */
481 for( i = 0; i < Pool_Size; i++ ) {
482 if ( My_Connections[i].sock <= NONE )
485 wdatalen = array_bytes(&My_Connections[i].wbuf);
488 if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
493 /* Socket der Verbindung in Set aufnehmen */
494 io_event_add( My_Connections[i].sock, IO_WANTWRITE );
498 /* von welchen Sockets koennte gelesen werden? */
499 for (i = 0; i < Pool_Size; i++ ) {
500 if ( My_Connections[i].sock <= NONE )
503 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
504 /* wait for completion of Resolver Sub-Process */
505 io_event_del( My_Connections[i].sock, IO_WANTREAD );
509 if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
510 continue; /* wait for completion of connect() */
512 if( My_Connections[i].delaytime > t ) {
513 /* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
514 io_event_del( My_Connections[i].sock, IO_WANTREAD );
517 io_event_add( My_Connections[i].sock, IO_WANTREAD );
520 /* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */
522 tv.tv_sec = timeout ? 1 : 0;
524 /* wait for activity */
525 i = io_dispatch( &tv );
526 if (i == -1 && errno != EINTR ) {
527 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
528 Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
533 if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
534 else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
539 * Write a text string into the socket of a connection.
540 * This function automatically appends CR+LF to the string and validates that
541 * the result is a valid IRC message (oversized messages are shortened, for
542 * example). Then it calls the Conn_Write() function to do the actual sending.
543 * @param Idx Index fo the connection.
544 * @param Format Format string, see printf().
545 * @return true on success, false otherwise.
549 Conn_WriteStr( CONN_ID Idx, char *Format, ... )
552 Conn_WriteStr( Idx, Format, va_alist )
558 char buffer[COMMAND_LEN];
562 assert( Idx > NONE );
563 assert( Format != NULL );
566 va_start( ap, Format );
570 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
572 * The string that should be written to the socket is longer
573 * than the allowed size of COMMAND_LEN bytes (including both
574 * the CR and LF characters). This can be caused by the
575 * IRC_WriteXXX() functions when the prefix of this server had
576 * to be added to an already "quite long" command line which
577 * has been received from a regular IRC client, for example.
579 * We are not allowed to send such "oversized" messages to
580 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
581 * ("these messages SHALL NOT exceed 512 characters in length,
582 * counting all characters including the trailing CR-LF").
584 * So we have a big problem here: we should send more bytes
585 * to the network than we are allowed to and we don't know
586 * the originator (any more). The "old" behaviour of blaming
587 * the receiver ("next hop") is a bad idea (it could be just
588 * an other server only routing the message!), so the only
589 * option left is to shorten the string and to hope that the
590 * result is still somewhat useful ...
594 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
600 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
603 strlcat( buffer, "\r\n", sizeof( buffer ));
604 ok = Conn_Write( Idx, buffer, strlen( buffer ));
605 My_Connections[Idx].msg_out++;
609 } /* Conn_WriteStr */
613 Conn_Write( CONN_ID Idx, char *Data, unsigned int Len )
615 /* Daten in Socket schreiben. Bei "fatalen" Fehlern wird
616 * der Client disconnectiert und false geliefert. */
618 assert( Idx > NONE );
619 assert( Data != NULL );
622 /* Ist der entsprechende Socket ueberhaupt noch offen? In einem
623 * "Handler-Durchlauf" kann es passieren, dass dem nicht mehr so
624 * ist, wenn einer von mehreren Conn_Write()'s fehlgeschlagen ist.
625 * In diesem Fall wird hier einfach ein Fehler geliefert. */
626 if( My_Connections[Idx].sock <= NONE ) {
627 LogDebug("Skipped write on closed socket (connection %d).", Idx );
631 /* Pruefen, ob im Schreibpuffer genuegend Platz ist. Ziel ist es,
632 * moeglichts viel im Puffer zu haben und _nicht_ gleich alles auf den
633 * Socket zu schreiben (u.a. wg. Komprimierung). */
634 if( array_bytes(&My_Connections[Idx].wbuf) >= WRITEBUFFER_LEN) {
635 /* Der Puffer ist dummerweise voll. Jetzt versuchen, den Puffer
636 * zu schreiben, wenn das nicht klappt, haben wir ein Problem ... */
637 if( ! Handle_Write( Idx )) return false;
639 /* check again: if our writebuf is twice als large as the initial limit: Kill connection */
640 if( array_bytes(&My_Connections[Idx].wbuf) >= (WRITEBUFFER_LEN*2)) {
641 Log( LOG_NOTICE, "Write buffer overflow (connection %d)!", Idx );
642 Conn_Close( Idx, "Write buffer overflow!", NULL, false );
648 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
649 /* Daten komprimieren und in Puffer kopieren */
650 if( ! Zip_Buffer( Idx, Data, Len )) return false;
655 /* Daten in Puffer kopieren */
656 if (!array_catb( &My_Connections[Idx].wbuf, Data, Len ))
659 My_Connections[Idx].bytes_out += Len;
662 /* Adjust global write counter */
670 Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
672 /* Close connection. Open pipes of asyncronous resolver
673 * sub-processes are closed down. */
679 double in_z_k, out_z_k;
683 assert( Idx > NONE );
685 /* Is this link already shutting down? */
686 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
687 /* Conn_Close() has been called recursively for this link;
688 * probabe reason: Handle_Write() failed -- see below. */
689 LogDebug("Recursive request to close connection: %d", Idx );
693 assert( My_Connections[Idx].sock > NONE );
695 /* Mark link as "closing" */
696 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
698 if( LogMsg ) txt = LogMsg;
700 if( ! txt ) txt = "Reason unknown";
702 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 ));
704 /* Search client, if any */
705 c = Client_GetFromConn( Idx );
707 /* Should the client be informed? */
710 /* Send statistics to client if registered as user: */
711 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
713 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
714 Client_ID(Client_ThisServer()), Client_ID(c),
716 (double)My_Connections[Idx].bytes_in / 1024,
717 (double)My_Connections[Idx].bytes_out / 1024);
721 /* Send ERROR to client (see RFC!) */
723 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
725 Conn_WriteStr(Idx, "ERROR :Closing connection.");
728 /* Try to write out the write buffer. Note: Handle_Write() eventually
729 * removes the CLIENT structure associated with this connection if an
730 * error occurs! So we have to re-check if there is still an valid
731 * CLIENT structure after calling Handle_Write() ...*/
732 (void)Handle_Write( Idx );
734 /* Search client, if any (re-check!) */
735 c = Client_GetFromConn( Idx );
737 /* Shut down socket */
738 if( ! io_close( My_Connections[Idx].sock ))
740 /* Oops, we can't close the socket!? This is ... ugly! */
741 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 ));
744 /* Mark socket as invalid: */
745 My_Connections[Idx].sock = NONE;
747 /* If there is still a client, unregister it now */
748 if( c ) Client_Destroy( c, LogMsg, FwdMsg, true );
750 /* Calculate statistics and log information */
751 in_k = (double)My_Connections[Idx].bytes_in / 1024;
752 out_k = (double)My_Connections[Idx].bytes_out / 1024;
754 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
755 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
756 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
757 in_p = (int)(( in_k * 100 ) / in_z_k );
758 out_p = (int)(( out_k * 100 ) / out_z_k );
759 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 );
764 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 );
767 /* cancel running resolver */
768 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat)) {
769 Resolve_Shutdown(&My_Connections[Idx].res_stat);
772 /* Servers: Modify time of next connect attempt? */
773 Conf_UnsetServer( Idx );
776 /* Clean up zlib, if link was compressed */
777 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
778 inflateEnd( &My_Connections[Idx].zip.in );
779 deflateEnd( &My_Connections[Idx].zip.out );
780 array_free(&My_Connections[Idx].zip.rbuf);
781 array_free(&My_Connections[Idx].zip.wbuf);
785 array_free(&My_Connections[Idx].rbuf);
786 array_free(&My_Connections[Idx].wbuf);
787 /* Clean up connection structure (=free it) */
788 Init_Conn_Struct( Idx );
790 LogDebug("Shutdown of connection %d completed.", Idx );
795 Conn_SyncServerStruct( void )
797 /* Synchronize server structures (connection IDs):
798 * connections <-> configuration */
804 for( i = 0; i < Pool_Size; i++ ) {
805 /* Established connection? */
806 if (My_Connections[i].sock < 0)
809 /* Server connection? */
810 client = Client_GetFromConn( i );
811 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
813 for( c = 0; c < MAX_SERVERS; c++ )
815 /* Configured server? */
816 if( ! Conf_Server[c].host[0] ) continue;
819 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
820 Conf_Server[c].conn_id = i;
823 } /* SyncServerStruct */
827 Handle_Write( CONN_ID Idx )
829 /* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */
832 unsigned int wdatalen;
834 assert( Idx > NONE );
835 if ( My_Connections[Idx].sock < 0 ) {
836 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
839 assert( My_Connections[Idx].sock > NONE );
841 LogDebug("Handle_Write() called for connection %d ...", Idx);
843 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
845 if (wdatalen == 0 && !array_bytes(&My_Connections[Idx].zip.wbuf)) {
846 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
850 /* write buffer empty, but not compression buffer?
851 * -> flush compression buffer! */
856 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
861 /* Zip_Flush() may have changed the write buffer ... */
862 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
864 len = write(My_Connections[Idx].sock,
865 array_start(&My_Connections[Idx].wbuf), wdatalen );
868 if (errno == EAGAIN || errno == EINTR)
871 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
872 Idx, My_Connections[Idx].sock, strerror(errno));
873 Conn_Close(Idx, "Write error!", NULL, false);
877 /* move any data not yet written to beginning */
878 array_moveleft(&My_Connections[Idx].wbuf, 1, len);
885 New_Connection( int Sock )
887 /* Neue Client-Verbindung von Listen-Socket annehmen und
888 * CLIENT-Struktur anlegen. */
891 struct request_info req;
893 struct sockaddr_in new_addr;
894 int new_sock, new_sock_len, new_Pool_Size;
898 assert( Sock > NONE );
899 /* Connection auf Listen-Socket annehmen */
900 new_sock_len = sizeof( new_addr );
901 new_sock = accept( Sock, (struct sockaddr *)&new_addr, (socklen_t *)&new_sock_len );
904 Log( LOG_CRIT, "Can't accept connection: %s!", strerror( errno ));
909 /* Validate socket using TCP Wrappers */
910 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
912 if( ! hosts_access( &req ))
915 Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
916 Simple_Message( new_sock, "ERROR :Connection refused" );
922 /* Socket initialisieren */
923 if (!Init_Socket( new_sock ))
926 /* Check IP-based connection limit */
927 cnt = Count_Connections( new_addr );
928 if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
930 /* Access denied, too many connections from this IP address! */
931 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
932 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
937 if( new_sock >= Pool_Size ) {
938 new_Pool_Size = new_sock + 1;
939 /* No free Connection Structures, check if we may accept further connections */
940 if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
941 (new_Pool_Size < Pool_Size))
943 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
944 Simple_Message( new_sock, "ERROR :Connection limit reached" );
949 if (!array_alloc(&My_ConnArray, sizeof( CONNECTION ), new_sock)) {
950 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
951 Simple_Message( new_sock, "ERROR: Internal error" );
955 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
956 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
958 /* Adjust pointer to new block */
959 My_Connections = array_start(&My_ConnArray);
960 Pool_Size = new_Pool_Size;
963 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
965 Log( LOG_ALERT, "Can't accept connection: can't create client structure!" );
966 Simple_Message( new_sock, "ERROR :Internal error" );
971 Init_Conn_Struct( new_sock );
972 My_Connections[new_sock].sock = new_sock;
973 My_Connections[new_sock].addr = new_addr;
975 /* register callback */
976 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
977 Simple_Message( new_sock, "ERROR :Internal error" );
978 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
982 Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
983 inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
985 /* Hostnamen ermitteln */
986 strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ),
987 sizeof( My_Connections[new_sock].host ));
989 Client_SetHostname( c, My_Connections[new_sock].host );
991 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
992 My_Connections[new_sock].sock, cb_Read_Resolver_Result);
994 /* Penalty-Zeit setzen */
995 Conn_SetPenalty( new_sock, 4 );
997 } /* New_Connection */
1001 Socket2Index( int Sock )
1003 /* zum Socket passende Connection suchen */
1005 assert( Sock >= 0 );
1007 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1008 /* die Connection wurde vermutlich (wegen eines
1009 * Fehlers) bereits wieder abgebaut ... */
1010 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1014 } /* Socket2Index */
1018 Read_Request( CONN_ID Idx )
1020 /* Daten von Socket einlesen und entsprechend behandeln.
1021 * Tritt ein Fehler auf, so wird der Socket geschlossen. */
1027 assert( Idx > NONE );
1028 assert( My_Connections[Idx].sock > NONE );
1031 if (( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN ) ||
1032 ( array_bytes(&My_Connections[Idx].zip.rbuf) >= ZREADBUFFER_LEN ))
1034 if ( array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN )
1037 /* Der Lesepuffer ist voll */
1038 Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx,
1039 array_bytes(&My_Connections[Idx].rbuf));
1040 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1044 len = read( My_Connections[Idx].sock, readbuf, sizeof readbuf -1 );
1046 Log( LOG_INFO, "%s:%d (%s) is closing the connection ...",
1047 My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port),
1048 inet_ntoa( My_Connections[Idx].addr.sin_addr ));
1049 Conn_Close( Idx, "Socket closed!", "Client closed connection", false );
1054 if( errno == EAGAIN ) return;
1055 Log( LOG_ERR, "Read error on connection %d (socket %d): %s!", Idx,
1056 My_Connections[Idx].sock, strerror( errno ));
1057 Conn_Close( Idx, "Read error!", "Client closed connection", false );
1061 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1062 if (!array_catb( &My_Connections[Idx].zip.rbuf, readbuf, len)) {
1063 Log( LOG_ERR, "Could not append recieved data to zip input buffer (connn %d): %d bytes!", Idx, len );
1064 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1071 if (!array_cats( &My_Connections[Idx].rbuf, readbuf )) {
1072 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1073 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1077 /* Update connection statistics */
1078 My_Connections[Idx].bytes_in += len;
1080 /* Update timestamp of last data received if this connection is
1081 * registered as a user, server or service connection. Don't update
1082 * otherwise, so users have at least Conf_PongTimeout seconds time to
1083 * register with the IRC server -- see Check_Connections(). */
1084 c = Client_GetFromConn(Idx);
1085 if (c && (Client_Type(c) == CLIENT_USER
1086 || Client_Type(c) == CLIENT_SERVER
1087 || Client_Type(c) == CLIENT_SERVICE))
1088 My_Connections[Idx].lastdata = time(NULL);
1090 /* Look at the data in the (read-) buffer of this connection */
1092 } /* Read_Request */
1096 Handle_Buffer( CONN_ID Idx )
1098 /* Handle Data in Connections Read-Buffer.
1099 * Return true if a reuqest was handled, false otherwise (also returned on errors). */
1113 if( My_Connections[Idx].delaytime > time( NULL )) return result;
1115 /* unpack compressed data */
1116 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
1117 if( ! Unzip_Buffer( Idx )) return false;
1120 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1123 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
1126 /* A Complete Request end with CR+LF, see RFC 2812. */
1127 ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
1129 if( ptr ) delta = 2; /* complete request */
1132 /* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
1133 * there are quite a few clients that do this (incl. "mIRC" :-( */
1134 ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
1135 ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
1137 if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
1138 else if( ptr1 ) ptr = ptr1;
1139 else if( ptr2 ) ptr = ptr2;
1146 /* End of request found */
1149 len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;
1151 if( len < 0 || len > ( COMMAND_LEN - 1 )) {
1152 /* Request must not exceed 512 chars (incl. CR+LF!), see
1153 * RFC 2812. Disconnect Client if this happens. */
1154 Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
1155 Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
1156 Conn_Close( Idx, NULL, "Request too long", true );
1160 if (len <= 2) { /* request was empty (only '\r\n') */
1161 array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
1165 /* remember if stream is already compressed */
1166 old_z = My_Connections[Idx].options & CONN_ZIP;
1169 My_Connections[Idx].msg_in++;
1170 if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
1175 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1176 LogDebug("Connection %d: %d bytes left in read buffer.",
1177 Idx, array_bytes(&My_Connections[Idx].rbuf));
1179 if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
1180 ( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
1182 /* The last Command activated Socket-Compression.
1183 * Data that was read after that needs to be copied to Unzip-buf
1184 * for decompression */
1185 if( array_bytes(&My_Connections[Idx].rbuf)> ZREADBUFFER_LEN ) {
1186 Log( LOG_ALERT, "Connection %d: No space left in unzip buf (need %u bytes)!",
1187 Idx, array_bytes(&My_Connections[Idx].rbuf ));
1190 if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
1193 array_trunc(&My_Connections[Idx].rbuf);
1194 LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
1195 array_bytes(&My_Connections[Idx].zip.rbuf));
1200 } /* Handle_Buffer */
1204 Check_Connections( void )
1206 /* check if connections are alive. if not, play PING-PONG first.
1207 * if this doesn't help either, disconnect client. */
1211 for( i = 0; i < Pool_Size; i++ ) {
1212 if (My_Connections[i].sock < 0)
1215 c = Client_GetFromConn( i );
1216 if( c && (( Client_Type( c ) == CLIENT_USER ) || ( Client_Type( c ) == CLIENT_SERVER ) || ( Client_Type( c ) == CLIENT_SERVICE )))
1218 /* connected User, Server or Service */
1219 if( My_Connections[i].lastping > My_Connections[i].lastdata ) {
1220 /* we already sent a ping */
1221 if( My_Connections[i].lastping < time( NULL ) - Conf_PongTimeout ) {
1223 LogDebug("Connection %d: Ping timeout: %d seconds.",
1224 i, Conf_PongTimeout );
1225 Conn_Close( i, NULL, "Ping timeout", true );
1228 else if( My_Connections[i].lastdata < time( NULL ) - Conf_PingTimeout ) {
1229 /* we need to sent a PING */
1230 LogDebug("Connection %d: sending PING ...", i );
1231 My_Connections[i].lastping = time( NULL );
1232 Conn_WriteStr( i, "PING :%s", Client_ID( Client_ThisServer( )));
1237 /* The connection is not fully established yet, so
1238 * we don't do the PING-PONG game here but instead
1239 * disconnect the client after "a short time" if it's
1240 * still not registered. */
1242 if (My_Connections[i].lastdata <
1243 time(NULL) - Conf_PongTimeout) {
1244 LogDebug("Unregistered connection %d timed out ...", i);
1245 Conn_Close(i, NULL, "Timeout", false);
1249 } /* Check_Connections */
1253 Check_Servers( void )
1255 /* Check if we can establish further server links */
1260 /* Check all configured servers */
1261 for( i = 0; i < MAX_SERVERS; i++ ) {
1262 /* Valid outgoing server which isn't already connected or disabled? */
1263 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1264 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1267 /* Is there already a connection in this group? */
1268 if( Conf_Server[i].group > NONE ) {
1269 for (n = 0; n < MAX_SERVERS; n++) {
1270 if (n == i) continue;
1271 if ((Conf_Server[n].conn_id > NONE) &&
1272 (Conf_Server[n].group == Conf_Server[i].group))
1275 if (n < MAX_SERVERS) continue;
1278 /* Check last connect attempt? */
1279 time_now = time(NULL);
1280 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1283 /* Okay, try to connect now */
1284 Conf_Server[i].lasttry = time_now;
1285 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1286 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1288 } /* Check_Servers */
1292 New_Server( int Server )
1294 /* Establish new server link */
1296 struct sockaddr_in new_addr;
1297 struct in_addr inaddr;
1301 assert( Server > NONE );
1303 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
1304 Conf_Server[Server].ip, Conf_Server[Server].port );
1306 #ifdef HAVE_INET_ATON
1307 if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
1309 memset( &inaddr, 0, sizeof( inaddr ));
1310 inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
1311 if( inaddr.s_addr == (unsigned)-1 )
1314 Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!",
1315 Conf_Server[Server].host, Conf_Server[Server].ip );
1319 memset( &new_addr, 0, sizeof( new_addr ));
1320 new_addr.sin_family = AF_INET;
1321 new_addr.sin_addr = inaddr;
1322 new_addr.sin_port = htons( Conf_Server[Server].port );
1324 new_sock = socket( PF_INET, SOCK_STREAM, 0 );
1325 if ( new_sock < 0 ) {
1326 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
1330 if( ! Init_Socket( new_sock )) return;
1332 res = connect( new_sock, (struct sockaddr *)&new_addr, sizeof( new_addr ));
1333 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1334 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1339 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), new_sock)) {
1340 Log( LOG_ALERT, "Cannot allocate memory for server connection (socket %d)", new_sock);
1345 My_Connections = array_start(&My_ConnArray);
1347 assert(My_Connections[new_sock].sock <= 0);
1349 Init_Conn_Struct(new_sock);
1351 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
1353 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1358 Client_SetIntroducer( c, c );
1359 Client_SetToken( c, TOKEN_OUTBOUND );
1361 /* Register connection */
1362 Conf_Server[Server].conn_id = new_sock;
1363 My_Connections[new_sock].sock = new_sock;
1364 My_Connections[new_sock].addr = new_addr;
1365 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1366 sizeof(My_Connections[new_sock].host ));
1368 /* Register new socket */
1369 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1370 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1371 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1372 Init_Conn_Struct( new_sock );
1373 Conf_Server[Server].conn_id = NONE;
1376 LogDebug("Registered new connection %d on socket %d.",
1377 new_sock, My_Connections[new_sock].sock );
1378 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1383 Init_Conn_Struct( CONN_ID Idx )
1385 time_t now = time( NULL );
1386 /* Connection-Struktur initialisieren */
1388 memset( &My_Connections[Idx], 0, sizeof ( CONNECTION ));
1389 My_Connections[Idx].sock = -1;
1390 My_Connections[Idx].lastdata = now;
1391 My_Connections[Idx].lastprivmsg = now;
1392 Resolve_Init(&My_Connections[Idx].res_stat);
1393 } /* Init_Conn_Struct */
1397 Init_Socket( int Sock )
1399 /* Initialize socket (set options) */
1403 if (!io_setnonblock(Sock)) {
1404 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1409 /* Don't block this port after socket shutdown */
1411 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1413 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1414 /* ignore this error */
1417 /* Set type of service (TOS) */
1418 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1419 value = IPTOS_LOWDELAY;
1420 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1421 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1423 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1424 /* ignore this error */
1434 cb_Connect_to_Server(int fd, UNUSED short events)
1436 /* Read result of resolver sub-process from pipe and start connection */
1439 char readbuf[HOST_LEN + 1];
1441 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1443 for (i=0; i < MAX_SERVERS; i++) {
1444 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1448 if( i >= MAX_SERVERS) {
1449 /* Ops, no matching server found?! */
1451 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1455 /* Read result from pipe */
1456 len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1);
1460 readbuf[len] = '\0';
1461 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1462 strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip ));
1466 } /* cb_Read_Forward_Lookup */
1470 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1472 /* Read result of resolver sub-process from pipe and update the
1473 * apropriate connection/client structure(s): hostname and/or
1474 * IDENT user name.*/
1481 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1483 char readbuf[HOST_LEN + 1];
1486 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1488 /* Search associated connection ... */
1489 for( i = 0; i < Pool_Size; i++ ) {
1490 if(( My_Connections[i].sock != NONE )
1491 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1494 if( i >= Pool_Size ) {
1495 /* Ops, none found? Probably the connection has already
1496 * been closed!? We'll ignore that ... */
1498 LogDebug("Resolver: Got callback for unknown connection!?");
1502 /* Read result from pipe */
1503 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1507 readbuf[len] = '\0';
1508 identptr = strchr(readbuf, '\n');
1509 assert(identptr != NULL);
1511 Log( LOG_CRIT, "Resolver: Got malformed result!");
1516 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1517 /* Okay, we got a complete result: this is a host name for outgoing
1518 * connections and a host name and IDENT user name (if enabled) for
1519 * incoming connections.*/
1520 assert ( My_Connections[i].sock >= 0 );
1521 /* Incoming connection. Search client ... */
1522 c = Client_GetFromConn( i );
1523 assert( c != NULL );
1525 /* Only update client information of unregistered clients */
1526 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1527 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1528 Client_SetHostname( c, readbuf);
1532 Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr);
1533 Client_SetUser( c, identptr, true );
1535 Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
1540 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1542 /* Reset penalty time */
1543 Conn_ResetPenalty( i );
1544 } /* cb_Read_Resolver_Result */
1548 Simple_Message( int Sock, char *Msg )
1550 char buf[COMMAND_LEN];
1551 /* Write "simple" message to socket, without using compression
1552 * or even the connection write buffers. Used e.g. for error
1553 * messages by New_Connection(). */
1554 assert( Sock > NONE );
1555 assert( Msg != NULL );
1557 strlcpy( buf, Msg, sizeof buf - 2);
1558 strlcat( buf, "\r\n", sizeof buf);
1559 (void)write( Sock, buf, strlen( buf ) );
1560 } /* Simple_Error */
1564 Count_Connections( struct sockaddr_in addr_in )
1569 for( i = 0; i < Pool_Size; i++ ) {
1570 if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
1573 } /* Count_Connections */