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 1.207 2007/05/09 13:21:11 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 bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
87 static int New_Connection PARAMS(( int Sock ));
88 static CONN_ID Socket2Index PARAMS(( int Sock ));
89 static void Read_Request PARAMS(( CONN_ID Idx ));
90 static bool Handle_Buffer PARAMS(( CONN_ID Idx ));
91 static void Check_Connections PARAMS(( void ));
92 static void Check_Servers PARAMS(( void ));
93 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
94 static bool Init_Socket PARAMS(( int Sock ));
95 static void New_Server PARAMS(( int Server ));
96 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
97 static int Count_Connections PARAMS(( struct sockaddr_in addr ));
98 static int NewListener PARAMS(( const UINT16 Port ));
100 static array My_Listeners;
101 static array My_ConnArray;
104 int allow_severity = LOG_INFO;
105 int deny_severity = LOG_ERR;
108 static void server_login PARAMS((CONN_ID idx));
110 static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what));
111 static void cb_Connect_to_Server PARAMS(( int sock, UNUSED short what));
112 static void cb_clientserver PARAMS((int sock, short what));
115 cb_listen(int sock, short irrelevant)
118 New_Connection( sock );
123 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 Conn_Close(idx, "Can't connect!", NULL, false);
157 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
163 server_login(CONN_ID idx)
165 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
166 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
168 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
169 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
171 /* Send PASS and SERVER command to peer */
172 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
173 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
178 cb_clientserver(int sock, short what)
180 CONN_ID idx = Socket2Index( sock );
183 Log(LOG_WARNING, "WTF: cb_clientserver wants to write on unknown socket?!");
189 if (what & IO_WANTREAD)
192 if (what & IO_WANTWRITE)
200 /* Modul initialisieren: statische Strukturen "ausnullen". */
204 /* Speicher fuer Verbindungs-Pool anfordern */
205 Pool_Size = CONNECTION_POOL;
206 if( Conf_MaxConnections > 0 )
208 /* konfiguriertes Limit beachten */
209 if( Pool_Size > Conf_MaxConnections ) Pool_Size = Conf_MaxConnections;
212 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
213 Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
217 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
218 * code; remove them! */
219 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
221 LogDebug("Allocated connection pool for %d items (%ld bytes).",
222 array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
224 assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
226 array_free( &My_Listeners );
228 /* Connection-Struktur initialisieren */
229 for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
231 /* Global write counter */
239 /* Modul abmelden: alle noch offenen Connections
240 * schliessen und freigeben. */
244 LogDebug("Shutting down all connections ..." );
246 Conn_ExitListeners();
248 /* Sockets schliessen */
249 for( idx = 0; idx < Pool_Size; idx++ ) {
250 if( My_Connections[idx].sock > NONE ) {
251 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
252 "Server going down (restarting)":"Server going down", true );
256 array_free(&My_ConnArray);
257 My_Connections = NULL;
259 io_library_shutdown();
264 ports_initlisteners(array *a, void (*func)(int,short))
266 unsigned int created = 0;
271 len = array_length(a, sizeof (UINT16));
272 port = array_start(a);
274 fd = NewListener( *port );
279 if (!io_event_create( fd, IO_WANTREAD, func )) {
280 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
281 fd, (unsigned int) *port, strerror(errno));
295 Conn_InitListeners( void )
297 /* Initialize ports on which the server should accept connections */
299 unsigned int created;
301 if (!io_library_init(CONNECTION_POOL)) {
302 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
306 created = ports_initlisteners(&Conf_ListenPorts, cb_listen);
309 } /* Conn_InitListeners */
313 Conn_ExitListeners( void )
315 /* Close down all listening sockets */
319 Rendezvous_UnregisterListeners( );
322 arraylen = array_length(&My_Listeners, sizeof (int));
323 Log( LOG_INFO, "Shutting down all listening sockets (%d total)...", arraylen );
324 fd = array_start(&My_Listeners);
329 LogDebug("Listening socket %d closed.", *fd );
332 array_free(&My_Listeners);
333 } /* Conn_ExitListeners */
336 /* return new listening port file descriptor or -1 on failure */
338 NewListener( const UINT16 Port )
340 /* Create new listening socket on specified port */
342 struct sockaddr_in addr;
343 struct in_addr inaddr;
346 char name[CLIENT_ID_LEN], *info;
349 /* Server-"Listen"-Socket initialisieren */
350 memset( &addr, 0, sizeof( addr ));
351 memset( &inaddr, 0, sizeof( inaddr ));
352 addr.sin_family = (sa_family_t)AF_INET;
353 addr.sin_port = htons( Port );
354 if( Conf_ListenAddress[0] )
356 #ifdef HAVE_INET_ATON
357 if( inet_aton( Conf_ListenAddress, &inaddr ) == 0 )
359 inaddr.s_addr = inet_addr( Conf_ListenAddress );
360 if( inaddr.s_addr == (unsigned)-1 )
363 Log( LOG_CRIT, "Can't listen on %s:%u: can't convert ip address %s!",
364 Conf_ListenAddress, Port, Conf_ListenAddress );
368 else inaddr.s_addr = htonl( INADDR_ANY );
369 addr.sin_addr = inaddr;
371 sock = socket( PF_INET, SOCK_STREAM, 0);
373 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
377 if( ! Init_Socket( sock )) return -1;
379 if (bind(sock, (struct sockaddr *)&addr, (socklen_t)sizeof(addr)) != 0) {
380 Log( LOG_CRIT, "Can't bind socket (port %d) : %s!", Port, strerror( errno ));
385 if( listen( sock, 10 ) != 0 ) {
386 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
391 /* keep fd in list so we can close it when ngircd restarts/shuts down */
392 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
393 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
398 if( Conf_ListenAddress[0]) Log( LOG_INFO, "Now listening on %s:%d (socket %d).", Conf_ListenAddress, Port, sock );
399 else Log( LOG_INFO, "Now listening on 0.0.0.0:%d (socket %d).", Port, sock );
402 /* Get best server description text */
403 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
406 /* Use server info string */
408 if( Conf_ServerInfo[0] == '[' )
410 /* Cut off leading hostname part in "[]" */
411 info = strchr( Conf_ServerInfo, ']' );
415 while( *info == ' ' ) info++;
418 if( ! info ) info = Conf_ServerInfo;
421 /* Add port number to description if non-standard */
423 snprintf(name, sizeof name, "%s (port %u)", info,
426 strlcpy(name, info, sizeof name);
428 /* Register service */
429 Rendezvous_Register( name, MDNS_TYPE, Port );
438 /* "Main Loop.": Loop until a signal (for shutdown or restart) arrives.
439 * Call io_dispatch() to check for read/writeable sockets every second
440 * Wait for status change on pending connections (e.g: when the hostname has been resolved)
441 * check for penalty/timeouts
442 * handle input buffers
445 unsigned int wdatalen;
450 while(( ! NGIRCd_SignalQuit ) && ( ! NGIRCd_SignalRestart )) {
454 Rendezvous_Handler( );
457 /* Should the configuration be reloaded? */
458 if (NGIRCd_SignalRehash) {
462 /* Check configured servers and established links */
464 Check_Connections( );
468 /* noch volle Lese-Buffer suchen */
469 for( i = 0; i < Pool_Size; i++ ) {
470 if(( My_Connections[i].sock > NONE ) && ( array_bytes(&My_Connections[i].rbuf) > 0 ) &&
471 ( My_Connections[i].delaytime < t ))
473 /* Kann aus dem Buffer noch ein Befehl extrahiert werden? */
474 if (Handle_Buffer( i )) timeout = false;
478 /* noch volle Schreib-Puffer suchen */
479 for( i = 0; i < Pool_Size; i++ ) {
480 if ( My_Connections[i].sock <= NONE )
483 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
486 if (( wdatalen > 0 ) || ( array_bytes(&My_Connections[i].zip.wbuf)> 0 ))
491 /* Socket der Verbindung in Set aufnehmen */
492 io_event_add( My_Connections[i].sock, IO_WANTWRITE );
496 /* von welchen Sockets koennte gelesen werden? */
497 for (i = 0; i < Pool_Size; i++ ) {
498 if ( My_Connections[i].sock <= NONE )
501 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
502 /* wait for completion of Resolver Sub-Process */
503 io_event_del( My_Connections[i].sock, IO_WANTREAD );
507 if ( Conn_OPTION_ISSET( &My_Connections[i], CONN_ISCONNECTING ))
508 continue; /* wait for completion of connect() */
510 if( My_Connections[i].delaytime > t ) {
511 /* Fuer die Verbindung ist eine "Penalty-Zeit" gesetzt */
512 io_event_del( My_Connections[i].sock, IO_WANTREAD );
515 io_event_add( My_Connections[i].sock, IO_WANTREAD );
518 /* (re-)set timeout - tv_sec/usec are undefined after io_dispatch() returns */
520 tv.tv_sec = timeout ? 1 : 0;
522 /* wait for activity */
523 i = io_dispatch( &tv );
524 if (i == -1 && errno != EINTR ) {
525 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!", strerror(errno));
526 Log(LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME);
531 if( NGIRCd_SignalQuit ) Log( LOG_NOTICE|LOG_snotice, "Server going down NOW!" );
532 else if( NGIRCd_SignalRestart ) Log( LOG_NOTICE|LOG_snotice, "Server restarting NOW!" );
537 * Write a text string into the socket of a connection.
538 * This function automatically appends CR+LF to the string and validates that
539 * the result is a valid IRC message (oversized messages are shortened, for
540 * example). Then it calls the Conn_Write() function to do the actual sending.
541 * @param Idx Index fo the connection.
542 * @param Format Format string, see printf().
543 * @return true on success, false otherwise.
547 Conn_WriteStr( CONN_ID Idx, char *Format, ... )
550 Conn_WriteStr( Idx, Format, va_alist )
556 char buffer[COMMAND_LEN];
561 assert( Idx > NONE );
562 assert( Format != NULL );
565 va_start( ap, Format );
569 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
571 * The string that should be written to the socket is longer
572 * than the allowed size of COMMAND_LEN bytes (including both
573 * the CR and LF characters). This can be caused by the
574 * IRC_WriteXXX() functions when the prefix of this server had
575 * to be added to an already "quite long" command line which
576 * has been received from a regular IRC client, for example.
578 * We are not allowed to send such "oversized" messages to
579 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
580 * ("these messages SHALL NOT exceed 512 characters in length,
581 * counting all characters including the trailing CR-LF").
583 * So we have a big problem here: we should send more bytes
584 * to the network than we are allowed to and we don't know
585 * the originator (any more). The "old" behaviour of blaming
586 * the receiver ("next hop") is a bad idea (it could be just
587 * an other server only routing the message!), so the only
588 * option left is to shorten the string and to hope that the
589 * result is still somewhat useful ...
593 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
599 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
602 len = strlcat( buffer, "\r\n", sizeof( buffer ));
603 ok = Conn_Write(Idx, buffer, len);
604 My_Connections[Idx].msg_out++;
608 } /* Conn_WriteStr */
612 * Append Data to outbound write buf.
613 * @param Idx Index fo the connection.
614 * @param Data pointer to data
615 * @param Len length of Data
616 * @return true on success, false otherwise.
619 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
622 size_t writebuf_limit = WRITEBUFFER_LEN;
623 assert( Idx > NONE );
624 assert( Data != NULL );
627 c = Conn_GetClient(Idx);
629 if (Client_Type(c) == CLIENT_SERVER)
630 writebuf_limit = WRITEBUFFER_LEN * 10;
631 /* Is the socket still open? A previous call to Conn_Write()
632 * may have closed the connection due to a fatal error.
633 * In this case it is sufficient to return an error */
634 if( My_Connections[Idx].sock <= NONE ) {
635 LogDebug("Skipped write on closed socket (connection %d).", Idx );
639 /* check if outbound buffer has enough space for data.
640 * the idea is to keep data buffered before sending, e.g. to improve
642 if (array_bytes(&My_Connections[Idx].wbuf) >= writebuf_limit) {
643 /* Buffer is full, flush. Handle_Write deals with low-level errors, if any. */
644 if( ! Handle_Write( Idx )) return false;
646 /* check again: if our writebuf is twice als large as the initial limit: Kill connection */
647 if (array_bytes(&My_Connections[Idx].wbuf) >= (writebuf_limit*2)) {
648 Log(LOG_NOTICE, "Write buffer overflow (connection %d, size %lu byte)!", Idx,
649 (unsigned long) array_bytes(&My_Connections[Idx].wbuf));
650 Conn_Close( Idx, "Write buffer overflow!", NULL, false );
656 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
657 /* compress and move data to write buffer */
658 if( ! Zip_Buffer( Idx, Data, Len )) return false;
663 /* copy data to write buffer */
664 if (!array_catb( &My_Connections[Idx].wbuf, Data, Len ))
667 My_Connections[Idx].bytes_out += Len;
670 /* Adjust global write counter */
678 Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
680 /* Close connection. Open pipes of asyncronous resolver
681 * sub-processes are closed down. */
687 double in_z_k, out_z_k;
691 assert( Idx > NONE );
693 /* Is this link already shutting down? */
694 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
695 /* Conn_Close() has been called recursively for this link;
696 * probabe reason: Handle_Write() failed -- see below. */
697 LogDebug("Recursive request to close connection: %d", Idx );
701 assert( My_Connections[Idx].sock > NONE );
703 /* Mark link as "closing" */
704 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
711 txt = "Reason unknown";
713 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
714 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host,
715 ntohs(My_Connections[Idx].addr.sin_port));
717 /* Search client, if any */
718 c = Conn_GetClient( Idx );
720 /* Should the client be informed? */
723 /* Send statistics to client if registered as user: */
724 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
726 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
727 Client_ID(Client_ThisServer()), Client_ID(c),
729 (double)My_Connections[Idx].bytes_in / 1024,
730 (double)My_Connections[Idx].bytes_out / 1024);
733 /* Send ERROR to client (see RFC!) */
735 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
737 Conn_WriteStr(Idx, "ERROR :Closing connection.");
740 /* Try to write out the write buffer. Note: Handle_Write() eventually
741 * removes the CLIENT structure associated with this connection if an
742 * error occurs! So we have to re-check if there is still an valid
743 * CLIENT structure after calling Handle_Write() ...*/
744 (void)Handle_Write( Idx );
746 /* Search client, if any (re-check!) */
747 c = Conn_GetClient( Idx );
749 /* Shut down socket */
750 if (! io_close(My_Connections[Idx].sock)) {
751 /* Oops, we can't close the socket!? This is ... ugly! */
753 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
754 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
755 ntohs(My_Connections[Idx].addr.sin_port), strerror(errno));
758 /* Mark socket as invalid: */
759 My_Connections[Idx].sock = NONE;
761 /* If there is still a client, unregister it now */
763 Client_Destroy(c, LogMsg, FwdMsg, true);
765 /* Calculate statistics and log information */
766 in_k = (double)My_Connections[Idx].bytes_in / 1024;
767 out_k = (double)My_Connections[Idx].bytes_out / 1024;
769 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
770 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
771 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
772 /* Make sure that no division by zero can occur during
773 * the calculation of in_p and out_p: in_z_k and out_z_k
774 * are non-zero, that's guaranteed by the protocol until
775 * compression can be enabled. */
780 in_p = (int)(( in_k * 100 ) / in_z_k );
781 out_p = (int)(( out_k * 100 ) / out_z_k );
783 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
784 Idx, My_Connections[Idx].host,
785 ntohs(My_Connections[Idx].addr.sin_port),
786 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
792 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
793 Idx, My_Connections[Idx].host,
794 ntohs(My_Connections[Idx].addr.sin_port),
798 /* cancel running resolver */
799 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
800 Resolve_Shutdown(&My_Connections[Idx].res_stat);
802 /* Servers: Modify time of next connect attempt? */
803 Conf_UnsetServer( Idx );
806 /* Clean up zlib, if link was compressed */
807 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
808 inflateEnd( &My_Connections[Idx].zip.in );
809 deflateEnd( &My_Connections[Idx].zip.out );
810 array_free(&My_Connections[Idx].zip.rbuf);
811 array_free(&My_Connections[Idx].zip.wbuf);
815 array_free(&My_Connections[Idx].rbuf);
816 array_free(&My_Connections[Idx].wbuf);
818 /* Clean up connection structure (=free it) */
819 Init_Conn_Struct( Idx );
821 LogDebug("Shutdown of connection %d completed.", Idx );
826 Conn_SyncServerStruct( void )
828 /* Synchronize server structures (connection IDs):
829 * connections <-> configuration */
835 for( i = 0; i < Pool_Size; i++ ) {
836 /* Established connection? */
837 if (My_Connections[i].sock < 0)
840 /* Server connection? */
841 client = Conn_GetClient( i );
842 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
844 for( c = 0; c < MAX_SERVERS; c++ )
846 /* Configured server? */
847 if( ! Conf_Server[c].host[0] ) continue;
850 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
851 Conf_Server[c].conn_id = i;
854 } /* SyncServerStruct */
858 * Send out data of write buffer; connect new sockets.
861 Handle_Write( CONN_ID Idx )
866 assert( Idx > NONE );
867 if ( My_Connections[Idx].sock < 0 ) {
868 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
871 assert( My_Connections[Idx].sock > NONE );
873 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
876 if (wdatalen == 0 && !array_bytes(&My_Connections[Idx].zip.wbuf)) {
877 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
881 /* write buffer empty, but not compression buffer?
882 * -> flush compression buffer! */
887 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
892 /* Zip_Flush() may have changed the write buffer ... */
893 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
895 ("Handle_Write() called for connection %d, %ld bytes pending ...",
898 len = write(My_Connections[Idx].sock,
899 array_start(&My_Connections[Idx].wbuf), wdatalen );
902 if (errno == EAGAIN || errno == EINTR)
905 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
906 Idx, My_Connections[Idx].sock, strerror(errno));
907 Conn_Close(Idx, "Write error!", NULL, false);
911 /* move any data not yet written to beginning */
912 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
919 New_Connection( int Sock )
921 /* Neue Client-Verbindung von Listen-Socket annehmen und
922 * CLIENT-Struktur anlegen. */
925 struct request_info req;
927 struct sockaddr_in new_addr;
928 int new_sock, new_sock_len, new_Pool_Size;
932 assert( Sock > NONE );
933 /* Connection auf Listen-Socket annehmen */
934 new_sock_len = (int)sizeof new_addr;
935 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
936 (socklen_t *)&new_sock_len);
938 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
943 /* Validate socket using TCP Wrappers */
944 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
946 if( ! hosts_access( &req ))
949 Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
950 Simple_Message( new_sock, "ERROR :Connection refused" );
956 /* Socket initialisieren */
957 if (!Init_Socket( new_sock ))
960 /* Check IP-based connection limit */
961 cnt = Count_Connections( new_addr );
962 if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
964 /* Access denied, too many connections from this IP address! */
965 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
966 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
971 if( new_sock >= Pool_Size ) {
972 new_Pool_Size = new_sock + 1;
973 /* No free Connection Structures, check if we may accept further connections */
974 if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
975 (new_Pool_Size < Pool_Size))
977 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
978 Simple_Message( new_sock, "ERROR :Connection limit reached" );
983 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
985 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
986 Simple_Message( new_sock, "ERROR: Internal error" );
990 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
991 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
993 /* Adjust pointer to new block */
994 My_Connections = array_start(&My_ConnArray);
995 while (Pool_Size < new_Pool_Size)
996 Init_Conn_Struct(Pool_Size++);
999 /* register callback */
1000 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
1001 Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
1002 Simple_Message(new_sock, "ERROR :Internal error");
1007 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
1009 Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
1010 Simple_Message(new_sock, "ERROR :Internal error");
1015 Init_Conn_Struct( new_sock );
1016 My_Connections[new_sock].sock = new_sock;
1017 My_Connections[new_sock].addr = new_addr;
1018 My_Connections[new_sock].client = c;
1020 Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
1021 inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
1023 /* Hostnamen ermitteln */
1024 strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ),
1025 sizeof( My_Connections[new_sock].host ));
1027 Client_SetHostname( c, My_Connections[new_sock].host );
1029 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1030 My_Connections[new_sock].sock, cb_Read_Resolver_Result);
1032 /* Penalty-Zeit setzen */
1033 Conn_SetPenalty( new_sock, 4 );
1035 } /* New_Connection */
1039 Socket2Index( int Sock )
1041 /* zum Socket passende Connection suchen */
1043 assert( Sock >= 0 );
1045 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1046 /* die Connection wurde vermutlich (wegen eines
1047 * Fehlers) bereits wieder abgebaut ... */
1048 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1052 } /* Socket2Index */
1056 Read_Request( CONN_ID Idx )
1058 /* Daten von Socket einlesen und entsprechend behandeln.
1059 * Tritt ein Fehler auf, so wird der Socket geschlossen. */
1061 size_t readbuf_limit = READBUFFER_LEN;
1063 char readbuf[READBUFFER_LEN];
1065 assert( Idx > NONE );
1066 assert( My_Connections[Idx].sock > NONE );
1068 c = Conn_GetClient(Idx);
1069 assert ( c != NULL);
1070 if (Client_Type(c) == CLIENT_SERVER)
1071 readbuf_limit = READBUFFER_LEN * 10;
1073 if ((array_bytes(&My_Connections[Idx].rbuf) >= readbuf_limit) ||
1074 (array_bytes(&My_Connections[Idx].zip.rbuf) >= readbuf_limit))
1076 if (array_bytes(&My_Connections[Idx].rbuf) >= readbuf_limit)
1079 /* Der Lesepuffer ist voll */
1080 Log( LOG_ERR, "Receive buffer overflow (connection %d): %d bytes!", Idx,
1081 array_bytes(&My_Connections[Idx].rbuf));
1082 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1086 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1088 Log( LOG_INFO, "%s:%d (%s) is closing the connection ...",
1089 My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port),
1090 inet_ntoa( My_Connections[Idx].addr.sin_addr ));
1091 Conn_Close( Idx, "Socket closed!", "Client closed connection", false );
1096 if( errno == EAGAIN ) return;
1097 Log( LOG_ERR, "Read error on connection %d (socket %d): %s!", Idx,
1098 My_Connections[Idx].sock, strerror( errno ));
1099 Conn_Close( Idx, "Read error!", "Client closed connection", false );
1103 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1104 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1107 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1109 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1116 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1117 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1118 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1122 /* Update connection statistics */
1123 My_Connections[Idx].bytes_in += len;
1125 /* Update timestamp of last data received if this connection is
1126 * registered as a user, server or service connection. Don't update
1127 * otherwise, so users have at least Conf_PongTimeout seconds time to
1128 * register with the IRC server -- see Check_Connections().
1129 * Set "lastping", too, so we can handle time shifts backwards ... */
1130 c = Conn_GetClient(Idx);
1131 if (c && (Client_Type(c) == CLIENT_USER
1132 || Client_Type(c) == CLIENT_SERVER
1133 || Client_Type(c) == CLIENT_SERVICE)) {
1134 My_Connections[Idx].lastdata = time(NULL);
1135 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1138 /* Look at the data in the (read-) buffer of this connection */
1140 } /* Read_Request */
1144 Handle_Buffer( CONN_ID Idx )
1146 /* Handle Data in Connections Read-Buffer.
1147 * Return true if a reuqest was handled, false otherwise (also returned on errors). */
1159 starttime = time(NULL);
1163 if( My_Connections[Idx].delaytime > starttime) return result;
1165 /* unpack compressed data */
1166 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
1167 if( ! Unzip_Buffer( Idx )) return false;
1170 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1173 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
1176 /* A Complete Request end with CR+LF, see RFC 2812. */
1177 ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
1179 if( ptr ) delta = 2; /* complete request */
1182 /* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
1183 * there are quite a few clients that do this (incl. "mIRC" :-( */
1184 ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
1185 ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
1187 if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
1188 else if( ptr1 ) ptr = ptr1;
1189 else if( ptr2 ) ptr = ptr2;
1196 /* End of request found */
1199 len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;
1201 if( len > ( COMMAND_LEN - 1 )) {
1202 /* Request must not exceed 512 chars (incl. CR+LF!), see
1203 * RFC 2812. Disconnect Client if this happens. */
1204 Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
1205 Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
1206 Conn_Close( Idx, NULL, "Request too long", true );
1210 if (len <= 2) { /* request was empty (only '\r\n') */
1211 array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
1215 /* remember if stream is already compressed */
1216 old_z = My_Connections[Idx].options & CONN_ZIP;
1219 My_Connections[Idx].msg_in++;
1220 if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
1225 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1226 LogDebug("Connection %d: %d bytes left in read buffer.",
1227 Idx, array_bytes(&My_Connections[Idx].rbuf));
1229 if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
1230 ( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
1232 /* The last Command activated Socket-Compression.
1233 * Data that was read after that needs to be copied to Unzip-buf
1234 * for decompression */
1235 if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
1238 array_trunc(&My_Connections[Idx].rbuf);
1239 LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
1240 array_bytes(&My_Connections[Idx].zip.rbuf));
1245 } /* Handle_Buffer */
1249 Check_Connections(void)
1251 /* check if connections are alive. if not, play PING-PONG first.
1252 * if this doesn't help either, disconnect client. */
1256 for (i = 0; i < Pool_Size; i++) {
1257 if (My_Connections[i].sock < 0)
1260 c = Conn_GetClient(i);
1261 if (c && ((Client_Type(c) == CLIENT_USER)
1262 || (Client_Type(c) == CLIENT_SERVER)
1263 || (Client_Type(c) == CLIENT_SERVICE))) {
1264 /* connected User, Server or Service */
1265 if (My_Connections[i].lastping >
1266 My_Connections[i].lastdata) {
1267 /* We already sent a ping */
1268 if (My_Connections[i].lastping <
1269 time(NULL) - Conf_PongTimeout) {
1272 ("Connection %d: Ping timeout: %d seconds.",
1273 i, Conf_PongTimeout);
1274 Conn_Close(i, NULL, "Ping timeout",
1277 } else if (My_Connections[i].lastdata <
1278 time(NULL) - Conf_PingTimeout) {
1279 /* We need to send a PING ... */
1280 LogDebug("Connection %d: sending PING ...", i);
1281 My_Connections[i].lastping = time(NULL);
1282 Conn_WriteStr(i, "PING :%s",
1283 Client_ID(Client_ThisServer()));
1286 /* The connection is not fully established yet, so
1287 * we don't do the PING-PONG game here but instead
1288 * disconnect the client after "a short time" if it's
1289 * still not registered. */
1291 if (My_Connections[i].lastdata <
1292 time(NULL) - Conf_PongTimeout) {
1294 ("Unregistered connection %d timed out ...",
1296 Conn_Close(i, NULL, "Timeout", false);
1300 } /* Check_Connections */
1304 Check_Servers( void )
1306 /* Check if we can establish further server links */
1311 /* Check all configured servers */
1312 for( i = 0; i < MAX_SERVERS; i++ ) {
1313 /* Valid outgoing server which isn't already connected or disabled? */
1314 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1315 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1318 /* Is there already a connection in this group? */
1319 if( Conf_Server[i].group > NONE ) {
1320 for (n = 0; n < MAX_SERVERS; n++) {
1321 if (n == i) continue;
1322 if ((Conf_Server[n].conn_id > NONE) &&
1323 (Conf_Server[n].group == Conf_Server[i].group))
1326 if (n < MAX_SERVERS) continue;
1329 /* Check last connect attempt? */
1330 time_now = time(NULL);
1331 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1334 /* Okay, try to connect now */
1335 Conf_Server[i].lasttry = time_now;
1336 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1337 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1339 } /* Check_Servers */
1343 New_Server( int Server )
1345 /* Establish new server link */
1347 struct sockaddr_in new_addr;
1348 struct in_addr inaddr;
1352 assert( Server > NONE );
1354 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
1355 Conf_Server[Server].ip, Conf_Server[Server].port );
1357 #ifdef HAVE_INET_ATON
1358 if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
1360 memset( &inaddr, 0, sizeof( inaddr ));
1361 inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
1362 if( inaddr.s_addr == (unsigned)-1 )
1365 Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!",
1366 Conf_Server[Server].host, Conf_Server[Server].ip );
1370 memset( &new_addr, 0, sizeof( new_addr ));
1371 new_addr.sin_family = (sa_family_t)AF_INET;
1372 new_addr.sin_addr = inaddr;
1373 new_addr.sin_port = htons( Conf_Server[Server].port );
1375 new_sock = socket( PF_INET, SOCK_STREAM, 0 );
1376 if ( new_sock < 0 ) {
1377 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
1381 if( ! Init_Socket( new_sock )) return;
1383 res = connect(new_sock, (struct sockaddr *)&new_addr,
1384 (socklen_t)sizeof(new_addr));
1385 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1386 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1391 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1393 "Cannot allocate memory for server connection (socket %d)",
1399 My_Connections = array_start(&My_ConnArray);
1401 assert(My_Connections[new_sock].sock <= 0);
1403 Init_Conn_Struct(new_sock);
1405 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
1407 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1412 Client_SetIntroducer( c, c );
1413 Client_SetToken( c, TOKEN_OUTBOUND );
1415 /* Register connection */
1416 Conf_Server[Server].conn_id = new_sock;
1417 My_Connections[new_sock].sock = new_sock;
1418 My_Connections[new_sock].addr = new_addr;
1419 My_Connections[new_sock].client = c;
1420 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1421 sizeof(My_Connections[new_sock].host ));
1423 /* Register new socket */
1424 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1425 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1426 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1427 Init_Conn_Struct( new_sock );
1428 Conf_Server[Server].conn_id = NONE;
1431 LogDebug("Registered new connection %d on socket %d.",
1432 new_sock, My_Connections[new_sock].sock );
1433 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1438 Init_Conn_Struct( CONN_ID Idx )
1440 time_t now = time( NULL );
1441 /* Connection-Struktur initialisieren */
1443 memset( &My_Connections[Idx], 0, sizeof ( CONNECTION ));
1444 My_Connections[Idx].sock = -1;
1445 My_Connections[Idx].lastdata = now;
1446 My_Connections[Idx].lastprivmsg = now;
1447 Resolve_Init(&My_Connections[Idx].res_stat);
1448 } /* Init_Conn_Struct */
1452 Init_Socket( int Sock )
1454 /* Initialize socket (set options) */
1458 if (!io_setnonblock(Sock)) {
1459 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1464 /* Don't block this port after socket shutdown */
1466 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1468 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1469 /* ignore this error */
1472 /* Set type of service (TOS) */
1473 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1474 value = IPTOS_LOWDELAY;
1475 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1476 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1478 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1479 /* ignore this error */
1489 cb_Connect_to_Server(int fd, UNUSED short events)
1491 /* Read result of resolver sub-process from pipe and start connection */
1494 char readbuf[HOST_LEN + 1];
1496 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1498 for (i=0; i < MAX_SERVERS; i++) {
1499 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1503 if( i >= MAX_SERVERS) {
1504 /* Ops, no matching server found?! */
1506 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1510 /* Read result from pipe */
1511 len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1);
1515 readbuf[len] = '\0';
1516 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1517 strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip ));
1521 } /* cb_Read_Forward_Lookup */
1525 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1527 /* Read result of resolver sub-process from pipe and update the
1528 * apropriate connection/client structure(s): hostname and/or
1529 * IDENT user name.*/
1536 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1538 char readbuf[HOST_LEN + 1];
1541 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1543 /* Search associated connection ... */
1544 for( i = 0; i < Pool_Size; i++ ) {
1545 if(( My_Connections[i].sock != NONE )
1546 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1549 if( i >= Pool_Size ) {
1550 /* Ops, none found? Probably the connection has already
1551 * been closed!? We'll ignore that ... */
1553 LogDebug("Resolver: Got callback for unknown connection!?");
1557 /* Read result from pipe */
1558 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1562 readbuf[len] = '\0';
1563 identptr = strchr(readbuf, '\n');
1564 assert(identptr != NULL);
1566 Log( LOG_CRIT, "Resolver: Got malformed result!");
1571 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1572 /* Okay, we got a complete result: this is a host name for outgoing
1573 * connections and a host name and IDENT user name (if enabled) for
1574 * incoming connections.*/
1575 assert ( My_Connections[i].sock >= 0 );
1576 /* Incoming connection. Search client ... */
1577 c = Conn_GetClient( i );
1578 assert( c != NULL );
1580 /* Only update client information of unregistered clients */
1581 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1582 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1583 Client_SetHostname( c, readbuf);
1587 Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr);
1588 Client_SetUser( c, identptr, true );
1590 Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
1595 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1597 /* Reset penalty time */
1598 Conn_ResetPenalty( i );
1599 } /* cb_Read_Resolver_Result */
1603 Simple_Message( int Sock, const char *Msg )
1605 char buf[COMMAND_LEN];
1607 /* Write "simple" message to socket, without using compression
1608 * or even the connection write buffers. Used e.g. for error
1609 * messages by New_Connection(). */
1610 assert( Sock > NONE );
1611 assert( Msg != NULL );
1613 strlcpy( buf, Msg, sizeof buf - 2);
1614 len = strlcat( buf, "\r\n", sizeof buf);
1615 (void)write(Sock, buf, len);
1616 } /* Simple_Error */
1620 Count_Connections( struct sockaddr_in addr_in )
1625 for( i = 0; i < Pool_Size; i++ ) {
1626 if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
1629 } /* Count_Connections */
1633 Conn_GetClient( CONN_ID Idx )
1635 /* return Client-Structure that belongs to the local Connection Idx.
1636 * If none is found, return NULL.
1641 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
1645 return c ? c->client : NULL;