2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2007 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 1.212 2007/10/04 15:03:56 alex 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 the outbound write buffer of a connection.
613 * @param Idx Index of the connection.
614 * @param Data pointer to the 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);
630 /* Servers do get special write buffer limits, so they can generate
631 * all the messages that are required while peering. */
632 if (Client_Type(c) == CLIENT_SERVER)
633 writebuf_limit = WRITEBUFFER_SLINK_LEN;
635 /* Is the socket still open? A previous call to Conn_Write()
636 * may have closed the connection due to a fatal error.
637 * In this case it is sufficient to return an error, as well. */
638 if( My_Connections[Idx].sock <= NONE ) {
639 LogDebug("Skipped write on closed socket (connection %d).", Idx);
644 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
646 * Zip_Buffer() does all the dirty work for us: it flushes
647 * the (pre-)compression buffers if required and handles
648 * all error conditions. */
649 if (!Zip_Buffer(Idx, Data, Len))
655 /* Uncompressed link:
656 * Check if outbound buffer has enough space for the data. */
657 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
659 /* Buffer is full, flush it. Handle_Write deals with
660 * low-level errors, if any. */
661 if (!Handle_Write(Idx))
665 /* When the write buffer is still too big after flushing it,
666 * the connection will be killed. */
667 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
670 "Write buffer overflow (connection %d, size %lu byte)!",
672 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
673 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
677 /* Copy data to write buffer */
678 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
681 My_Connections[Idx].bytes_out += Len;
684 /* Adjust global write counter */
692 Conn_Close( CONN_ID Idx, char *LogMsg, char *FwdMsg, bool InformClient )
694 /* Close connection. Open pipes of asyncronous resolver
695 * sub-processes are closed down. */
701 double in_z_k, out_z_k;
705 assert( Idx > NONE );
707 /* Is this link already shutting down? */
708 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
709 /* Conn_Close() has been called recursively for this link;
710 * probabe reason: Handle_Write() failed -- see below. */
711 LogDebug("Recursive request to close connection: %d", Idx );
715 assert( My_Connections[Idx].sock > NONE );
717 /* Mark link as "closing" */
718 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
725 txt = "Reason unknown";
727 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
728 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host,
729 ntohs(My_Connections[Idx].addr.sin_port));
731 /* Search client, if any */
732 c = Conn_GetClient( Idx );
734 /* Should the client be informed? */
737 /* Send statistics to client if registered as user: */
738 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
740 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
741 Client_ID(Client_ThisServer()), Client_ID(c),
743 (double)My_Connections[Idx].bytes_in / 1024,
744 (double)My_Connections[Idx].bytes_out / 1024);
747 /* Send ERROR to client (see RFC!) */
749 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
751 Conn_WriteStr(Idx, "ERROR :Closing connection.");
754 /* Try to write out the write buffer. Note: Handle_Write() eventually
755 * removes the CLIENT structure associated with this connection if an
756 * error occurs! So we have to re-check if there is still an valid
757 * CLIENT structure after calling Handle_Write() ...*/
758 (void)Handle_Write( Idx );
760 /* Search client, if any (re-check!) */
761 c = Conn_GetClient( Idx );
763 /* Shut down socket */
764 if (! io_close(My_Connections[Idx].sock)) {
765 /* Oops, we can't close the socket!? This is ... ugly! */
767 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
768 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
769 ntohs(My_Connections[Idx].addr.sin_port), strerror(errno));
772 /* Mark socket as invalid: */
773 My_Connections[Idx].sock = NONE;
775 /* If there is still a client, unregister it now */
777 Client_Destroy(c, LogMsg, FwdMsg, true);
779 /* Calculate statistics and log information */
780 in_k = (double)My_Connections[Idx].bytes_in / 1024;
781 out_k = (double)My_Connections[Idx].bytes_out / 1024;
783 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
784 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
785 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
786 /* Make sure that no division by zero can occur during
787 * the calculation of in_p and out_p: in_z_k and out_z_k
788 * are non-zero, that's guaranteed by the protocol until
789 * compression can be enabled. */
794 in_p = (int)(( in_k * 100 ) / in_z_k );
795 out_p = (int)(( out_k * 100 ) / out_z_k );
797 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
798 Idx, My_Connections[Idx].host,
799 ntohs(My_Connections[Idx].addr.sin_port),
800 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
806 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
807 Idx, My_Connections[Idx].host,
808 ntohs(My_Connections[Idx].addr.sin_port),
812 /* cancel running resolver */
813 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
814 Resolve_Shutdown(&My_Connections[Idx].res_stat);
816 /* Servers: Modify time of next connect attempt? */
817 Conf_UnsetServer( Idx );
820 /* Clean up zlib, if link was compressed */
821 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
822 inflateEnd( &My_Connections[Idx].zip.in );
823 deflateEnd( &My_Connections[Idx].zip.out );
824 array_free(&My_Connections[Idx].zip.rbuf);
825 array_free(&My_Connections[Idx].zip.wbuf);
829 array_free(&My_Connections[Idx].rbuf);
830 array_free(&My_Connections[Idx].wbuf);
832 /* Clean up connection structure (=free it) */
833 Init_Conn_Struct( Idx );
835 LogDebug("Shutdown of connection %d completed.", Idx );
840 Conn_SyncServerStruct( void )
842 /* Synchronize server structures (connection IDs):
843 * connections <-> configuration */
849 for( i = 0; i < Pool_Size; i++ ) {
850 /* Established connection? */
851 if (My_Connections[i].sock < 0)
854 /* Server connection? */
855 client = Conn_GetClient( i );
856 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
858 for( c = 0; c < MAX_SERVERS; c++ )
860 /* Configured server? */
861 if( ! Conf_Server[c].host[0] ) continue;
864 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
865 Conf_Server[c].conn_id = i;
868 } /* SyncServerStruct */
872 * Send out data of write buffer; connect new sockets.
875 Handle_Write( CONN_ID Idx )
880 assert( Idx > NONE );
881 if ( My_Connections[Idx].sock < 0 ) {
882 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
885 assert( My_Connections[Idx].sock > NONE );
887 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
891 /* Write buffer is empty, so we try to flush the compression
892 * buffer and get some data to work with from there :-) */
896 /* Now the write buffer most probably has changed: */
897 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
902 /* Still no data, fine. */
903 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
908 ("Handle_Write() called for connection %d, %ld bytes pending ...",
911 len = write(My_Connections[Idx].sock,
912 array_start(&My_Connections[Idx].wbuf), wdatalen );
915 if (errno == EAGAIN || errno == EINTR)
918 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
919 Idx, My_Connections[Idx].sock, strerror(errno));
920 Conn_Close(Idx, "Write error!", NULL, false);
924 /* move any data not yet written to beginning */
925 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
932 New_Connection( int Sock )
934 /* Neue Client-Verbindung von Listen-Socket annehmen und
935 * CLIENT-Struktur anlegen. */
938 struct request_info req;
940 struct sockaddr_in new_addr;
941 int new_sock, new_sock_len, new_Pool_Size;
945 assert( Sock > NONE );
946 /* Connection auf Listen-Socket annehmen */
947 new_sock_len = (int)sizeof new_addr;
948 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
949 (socklen_t *)&new_sock_len);
951 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
956 /* Validate socket using TCP Wrappers */
957 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
959 if( ! hosts_access( &req ))
962 Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
963 Simple_Message( new_sock, "ERROR :Connection refused" );
969 /* Socket initialisieren */
970 if (!Init_Socket( new_sock ))
973 /* Check IP-based connection limit */
974 cnt = Count_Connections( new_addr );
975 if(( Conf_MaxConnectionsIP > 0 ) && ( cnt >= Conf_MaxConnectionsIP ))
977 /* Access denied, too many connections from this IP address! */
978 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", inet_ntoa( new_addr.sin_addr ), cnt);
979 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
984 if( new_sock >= Pool_Size ) {
985 new_Pool_Size = new_sock + 1;
986 /* No free Connection Structures, check if we may accept further connections */
987 if ((( Conf_MaxConnections > 0) && Pool_Size >= Conf_MaxConnections) ||
988 (new_Pool_Size < Pool_Size))
990 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
991 Simple_Message( new_sock, "ERROR :Connection limit reached" );
996 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
998 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
999 Simple_Message( new_sock, "ERROR: Internal error" );
1003 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1004 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1006 /* Adjust pointer to new block */
1007 My_Connections = array_start(&My_ConnArray);
1008 while (Pool_Size < new_Pool_Size)
1009 Init_Conn_Struct(Pool_Size++);
1012 /* register callback */
1013 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
1014 Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
1015 Simple_Message(new_sock, "ERROR :Internal error");
1020 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWN, false );
1022 Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
1023 Simple_Message(new_sock, "ERROR :Internal error");
1028 Init_Conn_Struct( new_sock );
1029 My_Connections[new_sock].sock = new_sock;
1030 My_Connections[new_sock].addr = new_addr;
1031 My_Connections[new_sock].client = c;
1033 Log( LOG_INFO, "Accepted connection %d from %s:%d on socket %d.", new_sock,
1034 inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
1036 /* Hostnamen ermitteln */
1037 strlcpy( My_Connections[new_sock].host, inet_ntoa( new_addr.sin_addr ),
1038 sizeof( My_Connections[new_sock].host ));
1040 Client_SetHostname( c, My_Connections[new_sock].host );
1042 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1043 My_Connections[new_sock].sock, cb_Read_Resolver_Result);
1045 /* Penalty-Zeit setzen */
1046 Conn_SetPenalty( new_sock, 4 );
1048 } /* New_Connection */
1052 Socket2Index( int Sock )
1054 /* zum Socket passende Connection suchen */
1056 assert( Sock >= 0 );
1058 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1059 /* die Connection wurde vermutlich (wegen eines
1060 * Fehlers) bereits wieder abgebaut ... */
1061 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1065 } /* Socket2Index */
1069 * Read data from the network to the read buffer. If an error occures,
1070 * the socket of this connection will be shut down.
1073 Read_Request( CONN_ID Idx )
1076 char readbuf[READBUFFER_LEN];
1078 assert( Idx > NONE );
1079 assert( My_Connections[Idx].sock > NONE );
1082 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1083 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1085 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1088 /* Read buffer is full */
1090 "Receive buffer overflow (connection %d): %d bytes!",
1091 Idx, array_bytes(&My_Connections[Idx].rbuf));
1092 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1096 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1098 Log(LOG_INFO, "%s:%d (%s) is closing the connection ...",
1099 My_Connections[Idx].host,
1100 ntohs(My_Connections[Idx].addr.sin_port),
1101 inet_ntoa( My_Connections[Idx].addr.sin_addr));
1103 "Socket closed!", "Client closed connection",
1109 if( errno == EAGAIN ) return;
1110 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1111 Idx, My_Connections[Idx].sock, strerror(errno));
1112 Conn_Close(Idx, "Read error!", "Client closed connection",
1117 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1118 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1121 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1123 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1130 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1131 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1132 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1136 /* Update connection statistics */
1137 My_Connections[Idx].bytes_in += len;
1139 /* Update timestamp of last data received if this connection is
1140 * registered as a user, server or service connection. Don't update
1141 * otherwise, so users have at least Conf_PongTimeout seconds time to
1142 * register with the IRC server -- see Check_Connections().
1143 * Set "lastping", too, so we can handle time shifts backwards ... */
1144 c = Conn_GetClient(Idx);
1145 if (c && (Client_Type(c) == CLIENT_USER
1146 || Client_Type(c) == CLIENT_SERVER
1147 || Client_Type(c) == CLIENT_SERVICE)) {
1148 My_Connections[Idx].lastdata = time(NULL);
1149 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1152 /* Look at the data in the (read-) buffer of this connection */
1154 } /* Read_Request */
1158 Handle_Buffer( CONN_ID Idx )
1160 /* Handle Data in Connections Read-Buffer.
1161 * Return true if a reuqest was handled, false otherwise (also returned on errors). */
1173 starttime = time(NULL);
1177 if( My_Connections[Idx].delaytime > starttime) return result;
1179 /* unpack compressed data */
1180 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP ))
1181 if( ! Unzip_Buffer( Idx )) return false;
1184 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1187 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) /* make sure buf is NULL terminated */
1190 /* A Complete Request end with CR+LF, see RFC 2812. */
1191 ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
1193 if( ptr ) delta = 2; /* complete request */
1196 /* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
1197 * there are quite a few clients that do this (incl. "mIRC" :-( */
1198 ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
1199 ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
1201 if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
1202 else if( ptr1 ) ptr = ptr1;
1203 else if( ptr2 ) ptr = ptr2;
1210 /* End of request found */
1213 len = ( ptr - (char*) array_start(&My_Connections[Idx].rbuf)) + delta;
1215 if( len > ( COMMAND_LEN - 1 )) {
1216 /* Request must not exceed 512 chars (incl. CR+LF!), see
1217 * RFC 2812. Disconnect Client if this happens. */
1218 Log( LOG_ERR, "Request too long (connection %d): %d bytes (max. %d expected)!",
1219 Idx, array_bytes(&My_Connections[Idx].rbuf), COMMAND_LEN - 1 );
1220 Conn_Close( Idx, NULL, "Request too long", true );
1224 if (len <= 2) { /* request was empty (only '\r\n') */
1225 array_moveleft(&My_Connections[Idx].rbuf, 1, delta); /* delta is either 1 or 2 */
1229 /* remember if stream is already compressed */
1230 old_z = My_Connections[Idx].options & CONN_ZIP;
1233 My_Connections[Idx].msg_in++;
1234 if (!Parse_Request(Idx, (char*)array_start(&My_Connections[Idx].rbuf) ))
1239 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1240 LogDebug("Connection %d: %d bytes left in read buffer.",
1241 Idx, array_bytes(&My_Connections[Idx].rbuf));
1243 if(( ! old_z ) && ( My_Connections[Idx].options & CONN_ZIP ) &&
1244 ( array_bytes(&My_Connections[Idx].rbuf) > 0 ))
1246 /* The last Command activated Socket-Compression.
1247 * Data that was read after that needs to be copied to Unzip-buf
1248 * for decompression */
1249 if (!array_copy( &My_Connections[Idx].zip.rbuf, &My_Connections[Idx].rbuf ))
1252 array_trunc(&My_Connections[Idx].rbuf);
1253 LogDebug("Moved already received data (%u bytes) to uncompression buffer.",
1254 array_bytes(&My_Connections[Idx].zip.rbuf));
1259 } /* Handle_Buffer */
1263 Check_Connections(void)
1265 /* check if connections are alive. if not, play PING-PONG first.
1266 * if this doesn't help either, disconnect client. */
1270 for (i = 0; i < Pool_Size; i++) {
1271 if (My_Connections[i].sock < 0)
1274 c = Conn_GetClient(i);
1275 if (c && ((Client_Type(c) == CLIENT_USER)
1276 || (Client_Type(c) == CLIENT_SERVER)
1277 || (Client_Type(c) == CLIENT_SERVICE))) {
1278 /* connected User, Server or Service */
1279 if (My_Connections[i].lastping >
1280 My_Connections[i].lastdata) {
1281 /* We already sent a ping */
1282 if (My_Connections[i].lastping <
1283 time(NULL) - Conf_PongTimeout) {
1286 ("Connection %d: Ping timeout: %d seconds.",
1287 i, Conf_PongTimeout);
1288 Conn_Close(i, NULL, "Ping timeout",
1291 } else if (My_Connections[i].lastdata <
1292 time(NULL) - Conf_PingTimeout) {
1293 /* We need to send a PING ... */
1294 LogDebug("Connection %d: sending PING ...", i);
1295 My_Connections[i].lastping = time(NULL);
1296 Conn_WriteStr(i, "PING :%s",
1297 Client_ID(Client_ThisServer()));
1300 /* The connection is not fully established yet, so
1301 * we don't do the PING-PONG game here but instead
1302 * disconnect the client after "a short time" if it's
1303 * still not registered. */
1305 if (My_Connections[i].lastdata <
1306 time(NULL) - Conf_PongTimeout) {
1308 ("Unregistered connection %d timed out ...",
1310 Conn_Close(i, NULL, "Timeout", false);
1314 } /* Check_Connections */
1318 Check_Servers( void )
1320 /* Check if we can establish further server links */
1325 /* Check all configured servers */
1326 for( i = 0; i < MAX_SERVERS; i++ ) {
1327 /* Valid outgoing server which isn't already connected or disabled? */
1328 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1329 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1332 /* Is there already a connection in this group? */
1333 if( Conf_Server[i].group > NONE ) {
1334 for (n = 0; n < MAX_SERVERS; n++) {
1335 if (n == i) continue;
1336 if ((Conf_Server[n].conn_id != NONE) &&
1337 (Conf_Server[n].group == Conf_Server[i].group))
1340 if (n < MAX_SERVERS) continue;
1343 /* Check last connect attempt? */
1344 time_now = time(NULL);
1345 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1348 /* Okay, try to connect now */
1349 Conf_Server[i].lasttry = time_now;
1350 Conf_Server[i].conn_id = SERVER_WAIT;
1351 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1352 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1354 } /* Check_Servers */
1358 New_Server( int Server )
1360 /* Establish new server link */
1362 struct sockaddr_in new_addr;
1363 struct in_addr inaddr;
1367 assert( Server > NONE );
1369 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ", Conf_Server[Server].host,
1370 Conf_Server[Server].ip, Conf_Server[Server].port );
1372 #ifdef HAVE_INET_ATON
1373 if( inet_aton( Conf_Server[Server].ip, &inaddr ) == 0 )
1375 memset( &inaddr, 0, sizeof( inaddr ));
1376 inaddr.s_addr = inet_addr( Conf_Server[Server].ip );
1377 if( inaddr.s_addr == (unsigned)-1 )
1380 Log( LOG_ERR, "Can't connect to \"%s\": can't convert ip address %s!",
1381 Conf_Server[Server].host, Conf_Server[Server].ip );
1385 memset( &new_addr, 0, sizeof( new_addr ));
1386 new_addr.sin_family = (sa_family_t)AF_INET;
1387 new_addr.sin_addr = inaddr;
1388 new_addr.sin_port = htons( Conf_Server[Server].port );
1390 new_sock = socket( PF_INET, SOCK_STREAM, 0 );
1391 if ( new_sock < 0 ) {
1392 Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
1396 if( ! Init_Socket( new_sock )) return;
1398 res = connect(new_sock, (struct sockaddr *)&new_addr,
1399 (socklen_t)sizeof(new_addr));
1400 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1401 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1406 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1408 "Cannot allocate memory for server connection (socket %d)",
1414 My_Connections = array_start(&My_ConnArray);
1416 assert(My_Connections[new_sock].sock <= 0);
1418 Init_Conn_Struct(new_sock);
1420 c = Client_NewLocal( new_sock, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, false );
1422 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1427 Client_SetIntroducer( c, c );
1428 Client_SetToken( c, TOKEN_OUTBOUND );
1430 /* Register connection */
1431 Conf_Server[Server].conn_id = new_sock;
1432 My_Connections[new_sock].sock = new_sock;
1433 My_Connections[new_sock].addr = new_addr;
1434 My_Connections[new_sock].client = c;
1435 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1436 sizeof(My_Connections[new_sock].host ));
1438 /* Register new socket */
1439 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1440 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1441 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1442 Init_Conn_Struct( new_sock );
1443 Conf_Server[Server].conn_id = NONE;
1446 LogDebug("Registered new connection %d on socket %d.",
1447 new_sock, My_Connections[new_sock].sock );
1448 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1453 * Initialize connection structure.
1456 Init_Conn_Struct(CONN_ID Idx)
1458 time_t now = time(NULL);
1460 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1461 My_Connections[Idx].sock = -1;
1462 My_Connections[Idx].signon = now;
1463 My_Connections[Idx].lastdata = now;
1464 My_Connections[Idx].lastprivmsg = now;
1465 Resolve_Init(&My_Connections[Idx].res_stat);
1466 } /* Init_Conn_Struct */
1470 Init_Socket( int Sock )
1472 /* Initialize socket (set options) */
1476 if (!io_setnonblock(Sock)) {
1477 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1482 /* Don't block this port after socket shutdown */
1484 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1486 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1487 /* ignore this error */
1490 /* Set type of service (TOS) */
1491 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1492 value = IPTOS_LOWDELAY;
1493 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1494 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1496 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1497 /* ignore this error */
1507 cb_Connect_to_Server(int fd, UNUSED short events)
1509 /* Read result of resolver sub-process from pipe and start connection */
1512 char readbuf[HOST_LEN + 1];
1514 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1516 for (i=0; i < MAX_SERVERS; i++) {
1517 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1521 if( i >= MAX_SERVERS) {
1522 /* Ops, no matching server found?! */
1524 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1528 /* Read result from pipe */
1529 len = Resolve_Read(&Conf_Server[i].res_stat, readbuf, sizeof readbuf -1);
1533 readbuf[len] = '\0';
1534 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1535 strlcpy( Conf_Server[i].ip, readbuf, sizeof( Conf_Server[i].ip ));
1539 } /* cb_Read_Forward_Lookup */
1543 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1545 /* Read result of resolver sub-process from pipe and update the
1546 * apropriate connection/client structure(s): hostname and/or
1547 * IDENT user name.*/
1554 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1556 char readbuf[HOST_LEN + 1];
1559 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1561 /* Search associated connection ... */
1562 for( i = 0; i < Pool_Size; i++ ) {
1563 if(( My_Connections[i].sock != NONE )
1564 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1567 if( i >= Pool_Size ) {
1568 /* Ops, none found? Probably the connection has already
1569 * been closed!? We'll ignore that ... */
1571 LogDebug("Resolver: Got callback for unknown connection!?");
1575 /* Read result from pipe */
1576 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1580 readbuf[len] = '\0';
1581 identptr = strchr(readbuf, '\n');
1582 assert(identptr != NULL);
1584 Log( LOG_CRIT, "Resolver: Got malformed result!");
1589 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1590 /* Okay, we got a complete result: this is a host name for outgoing
1591 * connections and a host name and IDENT user name (if enabled) for
1592 * incoming connections.*/
1593 assert ( My_Connections[i].sock >= 0 );
1594 /* Incoming connection. Search client ... */
1595 c = Conn_GetClient( i );
1596 assert( c != NULL );
1598 /* Only update client information of unregistered clients */
1599 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1600 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1601 Client_SetHostname( c, readbuf);
1605 Log( LOG_INFO, "IDENT lookup for connection %ld: \"%s\".", i, identptr);
1606 Client_SetUser( c, identptr, true );
1608 Log( LOG_INFO, "IDENT lookup for connection %ld: no result.", i );
1613 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1615 /* Reset penalty time */
1616 Conn_ResetPenalty( i );
1617 } /* cb_Read_Resolver_Result */
1621 Simple_Message( int Sock, const char *Msg )
1623 char buf[COMMAND_LEN];
1625 /* Write "simple" message to socket, without using compression
1626 * or even the connection write buffers. Used e.g. for error
1627 * messages by New_Connection(). */
1628 assert( Sock > NONE );
1629 assert( Msg != NULL );
1631 strlcpy( buf, Msg, sizeof buf - 2);
1632 len = strlcat( buf, "\r\n", sizeof buf);
1633 (void)write(Sock, buf, len);
1634 } /* Simple_Error */
1638 Count_Connections( struct sockaddr_in addr_in )
1643 for( i = 0; i < Pool_Size; i++ ) {
1644 if(( My_Connections[i].sock > NONE ) && ( My_Connections[i].addr.sin_addr.s_addr == addr_in.sin_addr.s_addr )) cnt++;
1647 } /* Count_Connections */
1651 Conn_GetClient( CONN_ID Idx )
1653 /* return Client-Structure that belongs to the local Connection Idx.
1654 * If none is found, return NULL.
1659 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
1663 return c ? c->client : NULL;