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 1.206 2007/05/09 08:55:14 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, const 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)
126 CONN_ID idx = Socket2Index( sock );
128 LogDebug("cb_connserver wants to write on unknown socket?!");
133 assert( what & IO_WANTWRITE);
135 /* connect() finished, get result. */
136 sock_len = sizeof( err );
137 res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
138 assert( sock_len == sizeof( err ));
140 /* Error while connecting? */
141 if ((res != 0) || (err != 0)) {
143 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
144 idx, strerror(errno));
147 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
148 My_Connections[idx].host,
149 Conf_Server[Conf_GetServer(idx)].port,
152 Conn_Close(idx, "Can't connect!", NULL, false);
156 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
162 server_login(CONN_ID idx)
164 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
165 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
167 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
168 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
170 /* Send PASS and SERVER command to peer */
171 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
172 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
177 cb_clientserver(int sock, short what)
179 CONN_ID idx = Socket2Index( sock );
182 Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
188 if (what & IO_WANTREAD)
191 if (what & IO_WANTWRITE)
199 /* Modul initialisieren: statische Strukturen "ausnullen". */
203 /* Speicher fuer Verbindungs-Pool anfordern */
204 Pool_Size = CONNECTION_POOL;
205 if( Conf_MaxConnections > 0 )
207 /* konfiguriertes Limit beachten */
208 if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
211 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
212 Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
216 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
217 * code; remove them! */
218 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
220 LogDebug("Allocated connection pool for %d items (%ld bytes).",
221 array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
223 assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
225 array_free( &My_Listeners );
227 /* Connection-Struktur initialisieren */
228 for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
230 /* Global write counter */
238 /* Modul abmelden: alle noch offenen Connections
239 * schliessen und freigeben. */
243 LogDebug("Shutting down all connections ..." );
245 Conn_ExitListeners();
247 /* Sockets schliessen */
248 for( idx = 0; idx < Pool_Size; idx++ ) {
249 if( My_Connections[idx].sock > NONE ) {
250 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
251 "Server going down (restarting)":"Server going down", true );
255 array_free(&My_ConnArray);
256 My_Connections = NULL;
258 io_library_shutdown();
263 ports_initlisteners(array *a, void (*func)(int,short))
265 unsigned int created = 0;
270 len = array_length(a, sizeof (UINT16));
271 port = array_start(a);
273 fd = NewListener( *port );
278 if (!io_event_create( fd, IO_WANTREAD, func )) {
279 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
280 fd, (unsigned int) *port, strerror(errno));
294 Conn_InitListeners( void )
296 /* Initialize ports on which the server should accept connections */
298 unsigned int created;
300 if (!io_library_init(CONNECTION_POOL)) {
301 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
305 created = ports_initlisteners(&Conf_ListenPorts, cb_listen);
308 } /* Conn_InitListeners */
312 Conn_ExitListeners( void )
314 /* Close down all listening sockets */
318 Rendezvous_UnregisterListeners( );
321 arraylen = array_length(&My_Listeners, sizeof (int));
322 Log( LOG_INFO, "Shutting down all listening sockets (%d total)...", arraylen );
323 fd = array_start(&My_Listeners);
328 LogDebug("Listening socket %d closed.", *fd );
331 array_free(&My_Listeners);
332 } /* Conn_ExitListeners */
335 /* return new listening port file descriptor or -1 on failure */
337 NewListener( const UINT16 Port )
339 /* Create new listening socket on specified port */
341 struct sockaddr_in addr;
342 struct in_addr inaddr;
345 char name[CLIENT_ID_LEN], *info;
348 /* Server-"Listen"-Socket initialisieren */
349 memset( &addr, 0, sizeof( addr ));
350 memset( &inaddr, 0, sizeof( inaddr ));
351 addr.sin_family = (sa_family_t)AF_INET;
352 addr.sin_port = htons( Port );
353 if( Conf_ListenAddress[0] )
355 #ifdef HAVE_INET_ATON
356 if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
358 inaddr.s_addr = inet_addr( Conf_ListenAddress );
359 if( inaddr.s_addr == (unsigned)-1 )
362 Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!",
363 Conf_ListenAddress, Port, Conf_ListenAddress );
367 else inaddr.s_addr = htonl( INADDR_ANY );
368 addr.sin_addr = inaddr;
370 sock = socket( PF_INET, SOCK_STREAM, 0);
372 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
376 if( ! Init_Socket( sock )) return -1;
378 if (bind(sock, (struct sockaddr *)&addr, (socklen_t)sizeof(addr)) != 0) {
379 Log( LOG_CRIT, "Can't bind socket (port %d) : %s!", Port, strerror( errno ));
384 if( listen( sock, 10 ) != 0 ) {
385 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
390 /* keep fd in list so we can close it when ngircd restarts/shuts down */
391 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
392 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
397 if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
398 else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
401 /* Get best server description text */
402 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
405 /* Use server info string */
407 if( Conf_ServerInfo[0] == '[' )
409 /* Cut off leading hostname part in "[]" */
410 info = strchr( Conf_ServerInfo, ']' );
414 while( *info == ' ' ) info++;
417 if( ! info ) info = Conf_ServerInfo;
420 /* Add port number to description if non-standard */
422 snprintf(name, sizeof name, "%s (port %u)", info,
425 strlcpy(name, info, sizeof name);
427 /* Register service */
428 Rendezvous_Register( name, MDNS_TYPE, Port );
437 /* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
438 * Call io_dispatch() to check for read/writeable sockets every second
439 * Wait for status change on pending connections (e.g: when the hostname has been resolved)
440 * check for penalty/timeouts
441 * handle input buffers
444 unsigned int wdatalen;
449 while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) {
453 Rendezvous_Handler( );
456 /* Should the configuration be reloaded? */
457 if (NGIRCd_SignalRehash) {
461 /* Check configured servers and established links */
463 Check_Connections( );
467 /* noch volle Lese-Buffer suchen */
468 for( i = 0; i < Pool_Size; i++ ) {
469 if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
470 ( My_Connections[i].delaytime < t ))
472 /* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
473 if (Handle_Buffer( i )) timeout = false;
477 /* noch volle Schreib-Puffer suchen */
478 for( i = 0; i < Pool_Size; i++ ) {
479 if ( My_Connections[i].sock <= NONE )
482 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
485 if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
490 /* Socket der Verbindung in Set aufnehmen */
491 io_event_add( My_Connections[i].sock, IO_WANTWRITE );
495 /* von welchen Sockets koennte gelesen werden? */
496 for (i = 0; i < Pool_Size; i++ ) {
497 if ( My_Connections[i].sock <= NONE )
500 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
501 /* wait for completion of Resolver Sub-Process */
502 io_event_del( My_Connections[i].sock, IO_WANTREAD );
506 if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
507 continue; /* wait for completion of connect() */
509 if( My_Connections[i].delaytime > t ) {
510 /* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
511 io_event_del( My_Connections[i].sock, IO_WANTREAD );
514 io_event_add( My_Connections[i].sock, IO_WANTREAD );
517 /* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */
519 tv.tv_sec = timeout ? 1 : 0;
521 /* wait for activity */
522 i = io_dispatch( &tv );
523 if (i == -1 && errno != EINTR ) {
524 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
525 Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
530 if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
531 else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
536 * Write a text string into the socket of a connection.
537 * This function automatically appends CR+LF to the string and validates that
538 * the result is a valid IRC message (oversized messages are shortened, for
539 * example). Then it calls the Conn_Write() function to do the actual sending.
540 * @param Idx Index fo the connection.
541 * @param Format Format string, see printf().
542 * @return true on success, false otherwise.
546 Conn_WriteStr( CONN_ID Idx, char *Format, ... )
549 Conn_WriteStr( Idx, Format, va_alist )
555 char buffer[COMMAND_LEN];
560 assert( Idx > NONE );
561 assert( Format != NULL );
564 va_start( ap, Format );
568 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
570 * The string that should be written to the socket is longer
571 * than the allowed size of COMMAND_LEN bytes (including both
572 * the CR and LF characters). This can be caused by the
573 * IRC_WriteXXX() functions when the prefix of this server had
574 * to be added to an already "quite long" command line which
575 * has been received from a regular IRC client, for example.
577 * We are not allowed to send such "oversized" messages to
578 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
579 * ("these messages SHALL NOT exceed 512 characters in length,
580 * counting all characters including the trailing CR-LF").
582 * So we have a big problem here: we should send more bytes
583 * to the network than we are allowed to and we don't know
584 * the originator (any more). The "old" behaviour of blaming
585 * the receiver ("next hop") is a bad idea (it could be just
586 * an other server only routing the message!), so the only
587 * option left is to shorten the string and to hope that the
588 * result is still somewhat useful ...
592 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
598 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
601 len = strlcat( buffer, "\r\n", sizeof( buffer ));
602 ok = Conn_Write(Idx, buffer, len);
603 My_Connections[Idx].msg_out++;
607 } /* Conn_WriteStr */
611 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
613 /* Daten in Socket schreiben. Bei "fatalen" Fehlern wird
614 * der Client disconnectiert und false geliefert. */
617 size_t writebuf_limit = WRITEBUFFER_LEN;
618 assert( Idx > NONE );
619 assert( Data != NULL );
622 c = Conn_GetClient(Idx);
624 if (Client_Type(c) == CLIENT_SERVER)
625 writebuf_limit = WRITEBUFFER_LEN * 10;
626 /* Ist der entsprechende Socket ueberhaupt noch offen? In einem
627 * "Handler-Durchlauf" kann es passieren, dass dem nicht mehr so
628 * ist, wenn einer von mehreren Conn_Write()'s fehlgeschlagen ist.
629 * In diesem Fall wird hier einfach ein Fehler geliefert. */
630 if( My_Connections[Idx].sock <= NONE ) {
631 LogDebug("Skipped write on closed socket (connection %d).", Idx );
635 /* Pruefen, ob im Schreibpuffer genuegend Platz ist. Ziel ist es,
636 * moeglichts viel im Puffer zu haben und _nicht_ gleich alles auf den
637 * Socket zu schreiben (u.a. wg. Komprimierung). */
638 if (array_bytes(&My_Connections[Idx].wbuf) >= writebuf_limit) {
639 /* Der Puffer ist dummerweise voll. Jetzt versuchen, den Puffer
640 * zu schreiben, wenn das nicht klappt, haben wir ein Problem ... */
641 if( ! Handle_Write( Idx )) return false;
643 /* check again: if our writebuf is twice als large as the initial limit: Kill connection */
644 if (array_bytes(&My_Connections[Idx].wbuf) >= (writebuf_limit*2)) {
645 Log(LOG_NOTICE, "Write buffer overflow (connection %d, size %lu byte)!", Idx,
646 (unsigned long) array_bytes(&My_Connections[Idx].wbuf));
647 Conn_Close( Idx, "Write buffer overflow!", NULL, false );
653 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
654 /* Daten komprimieren und in Puffer kopieren */
655 if( ! Zip_Buffer( Idx, Data, Len )) return false;
660 /* Daten in Puffer kopieren */
661 if (!array_catb( &My_Connections[Idx].wbuf, Data, Len ))
664 My_Connections[Idx].bytes_out += Len;
667 /* Adjust global write counter */
675 Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
677 /* Close connection. Open pipes of asyncronous resolver
678 * sub-processes are closed down. */
684 double in_z_k, out_z_k;
688 assert( Idx > NONE );
690 /* Is this link already shutting down? */
691 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
692 /* Conn_Close() has been called recursively for this link;
693 * probabe reason: Handle_Write() failed -- see below. */
694 LogDebug("Recursive request to close connection: %d", Idx );
698 assert( My_Connections[Idx].sock > NONE );
700 /* Mark link as "closing" */
701 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
708 txt = "Reason unknown";
710 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
711 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host,
712 ntohs(My_Connections[Idx].addr.sin_port));
714 /* Search client, if any */
715 c = Conn_GetClient( Idx );
717 /* Should the client be informed? */
720 /* Send statistics to client if registered as user: */
721 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
723 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
724 Client_ID(Client_ThisServer()), Client_ID(c),
726 (double)My_Connections[Idx].bytes_in / 1024,
727 (double)My_Connections[Idx].bytes_out / 1024);
730 /* Send ERROR to client (see RFC!) */
732 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
734 Conn_WriteStr(Idx, "ERROR :Closing connection.");
737 /* Try to write out the write buffer. Note: Handle_Write() eventually
738 * removes the CLIENT structure associated with this connection if an
739 * error occurs! So we have to re-check if there is still an valid
740 * CLIENT structure after calling Handle_Write() ...*/
741 (void)Handle_Write( Idx );
743 /* Search client, if any (re-check!) */
744 c = Conn_GetClient( Idx );
746 /* Shut down socket */
747 if (! io_close(My_Connections[Idx].sock)) {
748 /* Oops, we can't close the socket!? This is ... ugly! */
750 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
751 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
752 ntohs(My_Connections[Idx].addr.sin_port), strerror(errno));
755 /* Mark socket as invalid: */
756 My_Connections[Idx].sock = NONE;
758 /* If there is still a client, unregister it now */
760 Client_Destroy(c, LogMsg, FwdMsg, true);
762 /* Calculate statistics and log information */
763 in_k = (double)My_Connections[Idx].bytes_in / 1024;
764 out_k = (double)My_Connections[Idx].bytes_out / 1024;
766 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
767 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
768 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
769 /* Make sure that no division by zero can occur during
770 * the calculation of in_p and out_p: in_z_k and out_z_k
771 * are non-zero, that's guaranteed by the protocol until
772 * compression can be enabled. */
777 in_p = (int)(( in_k * 100 ) / in_z_k );
778 out_p = (int)(( out_k * 100 ) / out_z_k );
780 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
781 Idx, My_Connections[Idx].host,
782 ntohs(My_Connections[Idx].addr.sin_port),
783 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
789 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
790 Idx, My_Connections[Idx].host,
791 ntohs(My_Connections[Idx].addr.sin_port),
795 /* cancel running resolver */
796 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
797 Resolve_Shutdown(&My_Connections[Idx].res_stat);
799 /* Servers: Modify time of next connect attempt? */
800 Conf_UnsetServer( Idx );
803 /* Clean up zlib, if link was compressed */
804 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
805 inflateEnd( &My_Connections[Idx].zip.in );
806 deflateEnd( &My_Connections[Idx].zip.out );
807 array_free(&My_Connections[Idx].zip.rbuf);
808 array_free(&My_Connections[Idx].zip.wbuf);
812 array_free(&My_Connections[Idx].rbuf);
813 array_free(&My_Connections[Idx].wbuf);
815 /* Clean up connection structure (=free it) */
816 Init_Conn_Struct( Idx );
818 LogDebug("Shutdown of connection %d completed.", Idx );
823 Conn_SyncServerStruct( void )
825 /* Synchronize server structures (connection IDs):
826 * connections <-> configuration */
832 for( i = 0; i < Pool_Size; i++ ) {
833 /* Established connection? */
834 if (My_Connections[i].sock < 0)
837 /* Server connection? */
838 client = Conn_GetClient( i );
839 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
841 for( c = 0; c < MAX_SERVERS; c++ )
843 /* Configured server? */
844 if( ! Conf_Server[c].host[0] ) continue;
847 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
848 Conf_Server[c].conn_id = i;
851 } /* SyncServerStruct */
855 * Send out data of write buffer; connect new sockets.
858 Handle_Write( CONN_ID Idx )
863 assert( Idx > NONE );
864 if ( My_Connections[Idx].sock < 0 ) {
865 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
868 assert( My_Connections[Idx].sock > NONE );
870 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
873 if (wdatalen == 0 && !array_bytes(&My_Connections[Idx].zip.wbuf)) {
874 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
878 /* write buffer empty, but not compression buffer?
879 * -> flush compression buffer! */
884 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
889 /* Zip_Flush() may have changed the write buffer ... */
890 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
892 ("Handle_Write() called for connection %d, %ld bytes pending ...",
895 len = write(My_Connections[Idx].sock,
896 array_start(&My_Connections[Idx].wbuf), wdatalen );
899 if (errno == EAGAIN || errno == EINTR)
902 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
903 Idx, My_Connections[Idx].sock, strerror(errno));
904 Conn_Close(Idx, "Write error!", NULL, false);
908 /* move any data not yet written to beginning */
909 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
916 New_Connection( int Sock )
918 /* Neue Client-Verbindung von Listen-Socket annehmen und
919 * CLIENT-Struktur anlegen. */
922 struct request_info req;
924 struct sockaddr_in new_addr;
925 int new_sock, new_sock_len, new_Pool_Size;
929 assert( Sock > NONE );
930 /* Connection auf Listen-Socket annehmen */
931 new_sock_len = (int)sizeof new_addr;
932 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
933 (socklen_t *)&new_sock_len);
935 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
940 /* Validate socket using TCP Wrappers */
941 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
943 if( ! hosts_access( &req ))
946 Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
947 Simple_Message( new_sock, "ERROR :Connection refused" );
953 /* Socket initialisieren */
954 if (!Init_Socket( new_sock ))
957 /* Check IP-based connection limit */
958 cnt = Count_Connections( new_addr );
959 if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
961 /* Access denied, too many connections from this IP address! */
962 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
963 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
968 if( new_sock >= Pool_Size ) {
969 new_Pool_Size = new_sock + 1;
970 /* No free Connection Structures, check if we may accept further connections */
971 if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
972 (new_Pool_Size < Pool_Size))
974 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
975 Simple_Message( new_sock, "ERROR :Connection limit reached" );
980 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
982 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
983 Simple_Message( new_sock, "ERROR: Internal error" );
987 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
988 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
990 /* Adjust pointer to new block */
991 My_Connections = array_start(&My_ConnArray);
992 while (Pool_Size < new_Pool_Size)
993 Init_Conn_Struct(Pool_Size++);
996 /* register callback */
997 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
998 Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
999 Simple_Message(new_sock, "ERROR :Internal error");
1004 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
1006 Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
1007 Simple_Message(new_sock, "ERROR :Internal error");
1012 Init_Conn_Struct( new_sock );
1013 My_Connections[new_sock].sock = new_sock;
1014 My_Connections[new_sock].addr = new_addr;
1015 My_Connections[new_sock].client = c;
1017 Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
1018 inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
1020 /* Hostnamen ermitteln */
1021 strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ),
1022 sizeof( My_Connections[new_sock].host ));
1024 Client_SetHostname( c, My_Connections[new_sock].host );
1026 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1027 My_Connections[new_sock].sock, cb_Read_Resolver_Result);
1029 /* Penalty-Zeit setzen */
1030 Conn_SetPenalty( new_sock, 4 );
1032 } /* New_Connection */
1036 Socket2Index( int Sock )
1038 /* zum Socket passende Connection suchen */
1040 assert( Sock >= 0 );
1042 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1043 /* die Connection wurde vermutlich (wegen eines
1044 * Fehlers) bereits wieder abgebaut ... */
1045 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1049 } /* Socket2Index */
1053 Read_Request( CONN_ID Idx )
1055 /* Daten von Socket einlesen und entsprechend behandeln.
1056 * Tritt ein Fehler auf, so wird der Socket geschlossen. */
1058 size_t readbuf_limit = READBUFFER_LEN;
1060 char readbuf[READBUFFER_LEN];
1062 assert( Idx > NONE );
1063 assert( My_Connections[Idx].sock > NONE );
1065 c = Conn_GetClient(Idx);
1066 assert ( c != NULL);
1067 if (Client_Type(c) == CLIENT_SERVER)
1068 readbuf_limit = READBUFFER_LEN * 10;
1070 if ((array_bytes(&My_Connections[Idx].rbuf) >= readbuf_limit) ||
1071 (array_bytes(&My_Connections[Idx].zip.rbuf) >= readbuf_limit))
1073 if (array_bytes(&My_Connections[Idx].rbuf) >= readbuf_limit)
1076 /* Der Lesepuffer ist voll */
1077 Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx,
1078 array_bytes(&My_Connections[Idx].rbuf));
1079 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1083 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1085 Log( LOG_INFO, "%s:%d (%s) is closing the connection ...",
1086 My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port),
1087 inet_ntoa( My_Connections[Idx].addr.sin_addr ));
1088 Conn_Close( Idx, "Socket closed!", "Client closed connection", false );
1093 if( errno == EAGAIN ) return;
1094 Log( LOG_ERR, "Read error on connection %d (socket %d): %s!", Idx,
1095 My_Connections[Idx].sock, strerror( errno ));
1096 Conn_Close( Idx, "Read error!", "Client closed connection", false );
1100 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1101 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1104 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1106 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1113 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1114 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1115 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1119 /* Update connection statistics */
1120 My_Connections[Idx].bytes_in += len;
1122 /* Update timestamp of last data received if this connection is
1123 * registered as a user, server or service connection. Don't update
1124 * otherwise, so users have at least Conf_PongTimeout seconds time to
1125 * register with the IRC server -- see Check_Connections().
1126 * Set "lastping", too, so we can handle time shifts backwards ... */
1127 c = Conn_GetClient(Idx);
1128 if (c && (Client_Type(c) == CLIENT_USER
1129 || Client_Type(c) == CLIENT_SERVER
1130 || Client_Type(c) == CLIENT_SERVICE)) {
1131 My_Connections[Idx].lastdata = time(NULL);
1132 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1135 /* Look at the data in the (read-) buffer of this connection */
1137 } /* Read_Request */
1141 Handle_Buffer( CONN_ID Idx )
1143 /* Handle Data in Connections Read-Buffer.
1144 * Return true if a reuqest was handled, false otherwise (also returned on errors). */
1156 starttime = time(NULL);
1160 if( My_Connections[Idx].delaytime > starttime) return result;
1162 /* unpack compressed data */
1163 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
1164 if( ! Unzip_Buffer( Idx )) return false;
1167 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1170 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
1173 /* A Complete Request end with CR+LF, see RFC 2812. */
1174 ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
1176 if( ptr ) delta = 2; /* complete request */
1179 /* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
1180 * there are quite a few clients that do this (incl. "mIRC" :-( */
1181 ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
1182 ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
1184 if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
1185 else if( ptr1 ) ptr = ptr1;
1186 else if( ptr2 ) ptr = ptr2;
1193 /* End of request found */
1196 len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;
1198 if( len > ( COMMAND_LEN - 1 )) {
1199 /* Request must not exceed 512 chars (incl. CR+LF!), see
1200 * RFC 2812. Disconnect Client if this happens. */
1201 Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
1202 Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
1203 Conn_Close( Idx, NULL, "Request too long", true );
1207 if (len <= 2) { /* request was empty (only '\r\n') */
1208 array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
1212 /* remember if stream is already compressed */
1213 old_z = My_Connections[Idx].options & CONN_ZIP;
1216 My_Connections[Idx].msg_in++;
1217 if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
1222 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1223 LogDebug("Connection %d: %d bytes left in read buffer.",
1224 Idx, array_bytes(&My_Connections[Idx].rbuf));
1226 if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
1227 ( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
1229 /* The last Command activated Socket-Compression.
1230 * Data that was read after that needs to be copied to Unzip-buf
1231 * for decompression */
1232 if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
1235 array_trunc(&My_Connections[Idx].rbuf);
1236 LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
1237 array_bytes(&My_Connections[Idx].zip.rbuf));
1242 } /* Handle_Buffer */
1246 Check_Connections(void)
1248 /* check if connections are alive. if not, play PING-PONG first.
1249 * if this doesn't help either, disconnect client. */
1253 for (i = 0; i < Pool_Size; i++) {
1254 if (My_Connections[i].sock < 0)
1257 c = Conn_GetClient(i);
1258 if (c && ((Client_Type(c) == CLIENT_USER)
1259 || (Client_Type(c) == CLIENT_SERVER)
1260 || (Client_Type(c) == CLIENT_SERVICE))) {
1261 /* connected User, Server or Service */
1262 if (My_Connections[i].lastping >
1263 My_Connections[i].lastdata) {
1264 /* We already sent a ping */
1265 if (My_Connections[i].lastping <
1266 time(NULL) - Conf_PongTimeout) {
1269 ("Connection %d: Ping timeout: %d seconds.",
1270 i, Conf_PongTimeout);
1271 Conn_Close(i, NULL, "Ping timeout",
1274 } else if (My_Connections[i].lastdata <
1275 time(NULL) - Conf_PingTimeout) {
1276 /* We need to send a PING ... */
1277 LogDebug("Connection %d: sending PING ...", i);
1278 My_Connections[i].lastping = time(NULL);
1279 Conn_WriteStr(i, "PING :%s",
1280 Client_ID(Client_ThisServer()));
1283 /* The connection is not fully established yet, so
1284 * we don't do the PING-PONG game here but instead
1285 * disconnect the client after "a short time" if it's
1286 * still not registered. */
1288 if (My_Connections[i].lastdata <
1289 time(NULL) - Conf_PongTimeout) {
1291 ("Unregistered connection %d timed out ...",
1293 Conn_Close(i, NULL, "Timeout", false);
1297 } /* Check_Connections */
1301 Check_Servers( void )
1303 /* Check if we can establish further server links */
1308 /* Check all configured servers */
1309 for( i = 0; i < MAX_SERVERS; i++ ) {
1310 /* Valid outgoing server which isn't already connected or disabled? */
1311 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1312 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1315 /* Is there already a connection in this group? */
1316 if( Conf_Server[i].group > NONE ) {
1317 for (n = 0; n < MAX_SERVERS; n++) {
1318 if (n == i) continue;
1319 if ((Conf_Server[n].conn_id > NONE) &&
1320 (Conf_Server[n].group == Conf_Server[i].group))
1323 if (n < MAX_SERVERS) continue;
1326 /* Check last connect attempt? */
1327 time_now = time(NULL);
1328 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1331 /* Okay, try to connect now */
1332 Conf_Server[i].lasttry = time_now;
1333 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1334 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1336 } /* Check_Servers */
1340 New_Server( int Server )
1342 /* Establish new server link */
1344 struct sockaddr_in new_addr;
1345 struct in_addr inaddr;
1349 assert( Server > NONE );
1351 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
1352 Conf_Server[Server].ip, Conf_Server[Server].port );
1354 #ifdef HAVE_INET_ATON
1355 if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
1357 memset( &inaddr, 0, sizeof( inaddr ));
1358 inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
1359 if( inaddr.s_addr == (unsigned)-1 )
1362 Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!",
1363 Conf_Server[Server].host, Conf_Server[Server].ip );
1367 memset( &new_addr, 0, sizeof( new_addr ));
1368 new_addr.sin_family = (sa_family_t)AF_INET;
1369 new_addr.sin_addr = inaddr;
1370 new_addr.sin_port = htons( Conf_Server[Server].port );
1372 new_sock = socket( PF_INET, SOCK_STREAM, 0 );
1373 if ( new_sock < 0 ) {
1374 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
1378 if( ! Init_Socket( new_sock )) return;
1380 res = connect(new_sock, (struct sockaddr *)&new_addr,
1381 (socklen_t)sizeof(new_addr));
1382 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1383 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1388 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1390 "Cannot allocate memory for server connection (socket %d)",
1396 My_Connections = array_start(&My_ConnArray);
1398 assert(My_Connections[new_sock].sock <= 0);
1400 Init_Conn_Struct(new_sock);
1402 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
1404 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1409 Client_SetIntroducer( c, c );
1410 Client_SetToken( c, TOKEN_OUTBOUND );
1412 /* Register connection */
1413 Conf_Server[Server].conn_id = new_sock;
1414 My_Connections[new_sock].sock = new_sock;
1415 My_Connections[new_sock].addr = new_addr;
1416 My_Connections[new_sock].client = c;
1417 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1418 sizeof(My_Connections[new_sock].host ));
1420 /* Register new socket */
1421 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1422 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1423 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1424 Init_Conn_Struct( new_sock );
1425 Conf_Server[Server].conn_id = NONE;
1428 LogDebug("Registered new connection %d on socket %d.",
1429 new_sock, My_Connections[new_sock].sock );
1430 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1435 Init_Conn_Struct( CONN_ID Idx )
1437 time_t now = time( NULL );
1438 /* Connection-Struktur initialisieren */
1440 memset( &My_Connections[Idx], 0, sizeof ( CONNECTION ));
1441 My_Connections[Idx].sock = -1;
1442 My_Connections[Idx].lastdata = now;
1443 My_Connections[Idx].lastprivmsg = now;
1444 Resolve_Init(&My_Connections[Idx].res_stat);
1445 } /* Init_Conn_Struct */
1449 Init_Socket( int Sock )
1451 /* Initialize socket (set options) */
1455 if (!io_setnonblock(Sock)) {
1456 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1461 /* Don't block this port after socket shutdown */
1463 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1465 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1466 /* ignore this error */
1469 /* Set type of service (TOS) */
1470 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1471 value = IPTOS_LOWDELAY;
1472 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1473 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1475 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1476 /* ignore this error */
1486 cb_Connect_to_Server(int fd, UNUSED short events)
1488 /* Read result of resolver sub-process from pipe and start connection */
1491 char readbuf[HOST_LEN + 1];
1493 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1495 for (i=0; i < MAX_SERVERS; i++) {
1496 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1500 if( i >= MAX_SERVERS) {
1501 /* Ops, no matching server found?! */
1503 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1507 /* Read result from pipe */
1508 len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1);
1512 readbuf[len] = '\0';
1513 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1514 strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip ));
1518 } /* cb_Read_Forward_Lookup */
1522 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1524 /* Read result of resolver sub-process from pipe and update the
1525 * apropriate connection/client structure(s): hostname and/or
1526 * IDENT user name.*/
1533 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1535 char readbuf[HOST_LEN + 1];
1538 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1540 /* Search associated connection ... */
1541 for( i = 0; i < Pool_Size; i++ ) {
1542 if(( My_Connections[i].sock != NONE )
1543 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1546 if( i >= Pool_Size ) {
1547 /* Ops, none found? Probably the connection has already
1548 * been closed!? We'll ignore that ... */
1550 LogDebug("Resolver: Got callback for unknown connection!?");
1554 /* Read result from pipe */
1555 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1559 readbuf[len] = '\0';
1560 identptr = strchr(readbuf, '\n');
1561 assert(identptr != NULL);
1563 Log( LOG_CRIT, "Resolver: Got malformed result!");
1568 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1569 /* Okay, we got a complete result: this is a host name for outgoing
1570 * connections and a host name and IDENT user name (if enabled) for
1571 * incoming connections.*/
1572 assert ( My_Connections[i].sock >= 0 );
1573 /* Incoming connection. Search client ... */
1574 c = Conn_GetClient( i );
1575 assert( c != NULL );
1577 /* Only update client information of unregistered clients */
1578 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1579 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1580 Client_SetHostname( c, readbuf);
1584 Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr);
1585 Client_SetUser( c, identptr, true );
1587 Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
1592 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1594 /* Reset penalty time */
1595 Conn_ResetPenalty( i );
1596 } /* cb_Read_Resolver_Result */
1600 Simple_Message( int Sock, const char *Msg )
1602 char buf[COMMAND_LEN];
1604 /* Write "simple" message to socket, without using compression
1605 * or even the connection write buffers. Used e.g. for error
1606 * messages by New_Connection(). */
1607 assert( Sock > NONE );
1608 assert( Msg != NULL );
1610 strlcpy( buf, Msg, sizeof buf - 2);
1611 len = strlcat( buf, "\r\n", sizeof buf);
1612 (void)write(Sock, buf, len);
1613 } /* Simple_Error */
1617 Count_Connections( struct sockaddr_in addr_in )
1622 for( i = 0; i < Pool_Size; i++ ) {
1623 if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
1626 } /* Count_Connections */
1630 Conn_GetClient( CONN_ID Idx )
1632 /* return Client-Structure that belongs to the local Connection Idx.
1633 * If none is found, return NULL.
1638 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
1642 return c ? c->client : NULL;