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
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <netinet/in.h>
39 #ifdef HAVE_NETINET_IP_H
40 # include <netinet/ip.h>
44 # include <stdint.h> /* e.g. for Mac OS X */
48 # include <tcpd.h> /* for TCP Wrappers */
64 #include "conn-func.h"
70 # include "rendezvous.h"
76 #define SERVER_WAIT (NONE - 1)
78 #define MAX_COMMANDS 3
79 #define MAX_COMMANDS_SERVER 10
82 static bool Handle_Write PARAMS(( CONN_ID Idx ));
83 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
84 static int New_Connection PARAMS(( int Sock ));
85 static CONN_ID Socket2Index PARAMS(( int Sock ));
86 static void Read_Request PARAMS(( CONN_ID Idx ));
87 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
88 static void Check_Connections PARAMS(( void ));
89 static void Check_Servers PARAMS(( void ));
90 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
91 static bool Init_Socket PARAMS(( int Sock ));
92 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
93 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
94 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
96 static array My_Listeners;
97 static array My_ConnArray;
98 static size_t NumConnections;
101 int allow_severity = LOG_INFO;
102 int deny_severity = LOG_ERR;
105 static void server_login PARAMS((CONN_ID idx));
108 extern struct SSLOptions Conf_SSLOptions;
109 static void cb_connserver_login_ssl PARAMS((int sock, short what));
110 static void cb_clientserver_ssl PARAMS((int sock, short what));
112 static void cb_Read_Resolver_Result PARAMS(( int sock, UNUSED short what));
113 static void cb_Connect_to_Server PARAMS(( int sock, UNUSED short what));
114 static void cb_clientserver PARAMS((int sock, short what));
117 cb_listen(int sock, short irrelevant)
120 if (New_Connection( sock ) >= 0)
122 LogDebug("Total number of connections now %ld.", NumConnections);
128 cb_listen_ssl(int sock, short irrelevant)
132 fd = New_Connection(sock);
137 LogDebug("Total number of connections now %ld.", NumConnections);
138 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
144 cb_connserver(int sock, UNUSED short what)
148 CONN_ID idx = Socket2Index( sock );
150 LogDebug("cb_connserver wants to write on unknown socket?!");
155 assert( what & IO_WANTWRITE);
157 /* connect() finished, get result. */
158 sock_len = sizeof( err );
159 res = getsockopt( My_Connections[idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
160 assert( sock_len == sizeof( err ));
162 /* Error while connecting? */
163 if ((res != 0) || (err != 0)) {
165 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
166 idx, strerror(errno));
169 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
170 My_Connections[idx].host,
171 Conf_Server[Conf_GetServer(idx)].port,
174 res = Conf_GetServer(idx);
177 Conn_Close(idx, "Can't connect!", NULL, false);
181 if (ng_ipaddr_af(&Conf_Server[res].dst_addr[0])) {
182 /* more addresses to try... */
183 New_Server(res, &Conf_Server[res].dst_addr[0]);
184 /* connection to dst_addr[0] in progress, remove this address... */
185 Conf_Server[res].dst_addr[0] = Conf_Server[res].dst_addr[1];
187 memset(&Conf_Server[res].dst_addr[1], 0, sizeof(&Conf_Server[res].dst_addr[1]));
192 res = Conf_GetServer(idx);
194 if (res >= 0) /* connect succeeded, remove all additional addresses */
195 memset(&Conf_Server[res].dst_addr, 0, sizeof(&Conf_Server[res].dst_addr));
196 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
198 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
199 io_event_setcb( sock, cb_connserver_login_ssl );
200 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
209 server_login(CONN_ID idx)
211 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
212 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
214 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
215 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
217 /* Send PASS and SERVER command to peer */
218 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
219 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
225 cb_connserver_login_ssl(int sock, short unused)
227 CONN_ID idx = Socket2Index(sock);
235 switch (ConnSSL_Connect( &My_Connections[idx])) {
237 case 0: LogDebug("ConnSSL_Connect: not ready");
240 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
241 Conn_Close(idx, "Can't connect!", NULL, false);
245 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
246 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
254 cb_clientserver(int sock, short what)
256 CONN_ID idx = Socket2Index(sock);
265 if (what & IO_WANTREAD || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE)))
266 Read_Request( idx ); /* if TLS layer needs to write additional data, call Read_Request instead so SSL/TLS can continue */
268 if (what & IO_WANTREAD)
271 if (what & IO_WANTWRITE)
278 cb_clientserver_ssl(int sock, short what)
280 CONN_ID idx = Socket2Index(sock);
289 switch (ConnSSL_Accept(&My_Connections[idx])) {
290 case 1: break; /* OK */
291 case 0: return; /* EAGAIN: this callback will be invoked again by the io layer */
293 Conn_Close( idx, "Socket closed!", "SSL accept error", false );
296 if (what & IO_WANTREAD)
299 if (what & IO_WANTWRITE)
302 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
312 /* Speicher fuer Verbindungs-Pool anfordern */
313 Pool_Size = CONNECTION_POOL;
314 if ((Conf_MaxConnections > 0) &&
315 (Pool_Size > Conf_MaxConnections))
316 Pool_Size = Conf_MaxConnections;
318 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
319 Log( LOG_EMERG, "Can't allocate memory! [Conn_Init]" );
323 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
324 * code; remove them! */
325 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
327 LogDebug("Allocated connection pool for %d items (%ld bytes).",
328 array_length(&My_ConnArray, sizeof( CONNECTION )), array_bytes(&My_ConnArray));
330 assert( array_length(&My_ConnArray, sizeof( CONNECTION )) >= (size_t) Pool_Size);
332 array_free( &My_Listeners );
334 /* Connection-Struktur initialisieren */
335 for( i = 0; i < Pool_Size; i++ ) Init_Conn_Struct( i );
337 /* Global write counter */
347 Conn_ExitListeners();
349 LogDebug("Shutting down all connections ..." );
350 for( idx = 0; idx < Pool_Size; idx++ ) {
351 if( My_Connections[idx].sock > NONE ) {
352 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
353 "Server going down (restarting)":"Server going down", true );
357 array_free(&My_ConnArray);
358 My_Connections = NULL;
360 io_library_shutdown();
365 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
367 unsigned int created = 0;
372 len = array_length(a, sizeof (UINT16));
373 port = array_start(a);
375 fd = NewListener(listen_addr, *port);
380 if (!io_event_create( fd, IO_WANTREAD, func )) {
381 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
382 fd, (unsigned int) *port, strerror(errno));
395 Conn_InitListeners( void )
397 /* Initialize ports on which the server should accept connections */
398 unsigned int created = 0;
399 char *copy, *listen_addr;
401 if (!io_library_init(CONNECTION_POOL)) {
402 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
406 assert(Conf_ListenAddress);
408 /* can't use Conf_ListenAddress directly, see below */
409 copy = strdup(Conf_ListenAddress);
411 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
414 listen_addr = strtok(copy, ",");
416 while (listen_addr) {
417 ngt_TrimStr(listen_addr);
419 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
421 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
425 listen_addr = strtok(NULL, ",");
429 * can't free() Conf_ListenAddress here. On /REHASH, if the config file
430 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
431 * Instead, free() takes place in conf.c, before the config file
436 } /* Conn_InitListeners */
440 Conn_ExitListeners( void )
442 /* Close down all listening sockets */
446 Rendezvous_UnregisterListeners( );
449 arraylen = array_length(&My_Listeners, sizeof (int));
451 "Shutting down all listening sockets (%d total) ...", arraylen);
452 fd = array_start(&My_Listeners);
457 LogDebug("Listening socket %d closed.", *fd );
460 array_free(&My_Listeners);
461 } /* Conn_ExitListeners */
465 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
469 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
471 assert(listen_addrstr);
472 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
473 listen_addrstr, Port, listen_addrstr);
480 set_v6_only(int af, int sock)
482 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
488 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)))
489 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
497 /* return new listening port file descriptor or -1 on failure */
499 NewListener(const char *listen_addr, UINT16 Port)
501 /* Create new listening socket on specified port */
505 char name[CLIENT_ID_LEN], *info;
507 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
510 af = ng_ipaddr_af(&addr);
511 sock = socket(af, SOCK_STREAM, 0);
513 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
517 set_v6_only(af, sock);
519 if (!Init_Socket(sock))
522 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
523 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
524 ng_ipaddr_tostr(&addr), Port, strerror(errno));
529 if( listen( sock, 10 ) != 0 ) {
530 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
535 /* keep fd in list so we can close it when ngircd restarts/shuts down */
536 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
537 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
542 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
545 /* Get best server description text */
546 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
549 /* Use server info string */
551 if( Conf_ServerInfo[0] == '[' )
553 /* Cut off leading hostname part in "[]" */
554 info = strchr( Conf_ServerInfo, ']' );
558 while( *info == ' ' ) info++;
561 if( ! info ) info = Conf_ServerInfo;
564 /* Add port number to description if non-standard */
566 snprintf(name, sizeof name, "%s (port %u)", info,
569 strlcpy(name, info, sizeof name);
571 /* Register service */
572 Rendezvous_Register( name, MDNS_TYPE, Port );
579 * SSL/TLS connections require extra treatment:
580 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
581 * need to take care of that first, before checking read/write buffers.
582 * For instance, while we might have data in our write buffer, the
583 * TLS/SSL protocol might need to read internal data first for TLS/SSL
586 * If this function returns true, such a condition is met and we have
587 * to reverse the condition (check for read even if we've data to write,
588 * do not check for read but writeability even if write-buffer is empty).
591 SSL_WantRead(const CONNECTION *c)
593 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
594 io_event_add(c->sock, IO_WANTREAD);
600 SSL_WantWrite(const CONNECTION *c)
602 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
603 io_event_add(c->sock, IO_WANTWRITE);
610 SSL_WantRead(UNUSED const CONNECTION *c) { return false; }
612 SSL_WantWrite(UNUSED const CONNECTION *c) { return false; }
617 * "Main Loop": Loop until shutdown or restart is signalled.
618 * This function loops until a shutdown or restart of ngIRCd is signalled and
619 * calls io_dispatch() to check for readable and writable sockets every second.
620 * It checks for status changes on pending connections (e. g. when a hostname
621 * has been resolved), checks for "penalties" and timeouts, and handles the
628 unsigned int wdatalen, bytes_processed;
632 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
636 Rendezvous_Handler();
639 /* Should the configuration be reloaded? */
640 if (NGIRCd_SignalRehash)
643 /* Check configured servers and established links */
647 /* Look for non-empty read buffers ... */
648 for (i = 0; i < Pool_Size; i++) {
649 if ((My_Connections[i].sock > NONE)
650 && (array_bytes(&My_Connections[i].rbuf) > 0)
651 && (My_Connections[i].delaytime <= t)) {
652 /* ... and try to handle the received data */
653 bytes_processed = Handle_Buffer(i);
654 /* if we processed data, and there might be
655 * more commands in the input buffer, do not
656 * try to read any more data now */
657 if (bytes_processed &&
658 array_bytes(&My_Connections[i].rbuf) > 2) {
660 ("Throttling connection %d: command limit reached!",
662 Conn_SetPenalty(i, 1);
667 /* Look for non-empty write buffers ... */
668 for (i = 0; i < Pool_Size; i++) {
669 if (My_Connections[i].sock <= NONE)
672 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
675 array_bytes(&My_Connections[i].zip.wbuf) > 0)
680 if (SSL_WantRead(&My_Connections[i]))
682 io_event_add(My_Connections[i].sock,
687 /* Check from which sockets we possibly could read ... */
688 for (i = 0; i < Pool_Size; i++) {
689 if (My_Connections[i].sock <= NONE)
692 if (SSL_WantWrite(&My_Connections[i]))
693 continue; /* TLS/SSL layer needs to write data; deal with this first */
695 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
696 /* Wait for completion of resolver sub-process ... */
697 io_event_del(My_Connections[i].sock,
702 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
703 /* Wait for completion of connect() ... */
706 if (My_Connections[i].delaytime > t) {
707 /* There is a "penalty time" set: ignore socket! */
708 io_event_del(My_Connections[i].sock,
712 io_event_add(My_Connections[i].sock, IO_WANTREAD);
715 /* Set the timeout for reading from the network to 1 second,
716 * which is the granularity with witch we handle "penalty
717 * times" for example.
718 * Note: tv_sec/usec are undefined(!) after io_dispatch()
719 * returns, so we have to set it beforce each call to it! */
723 /* Wait for activity ... */
724 i = io_dispatch(&tv);
725 if (i == -1 && errno != EINTR) {
726 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
728 Log(LOG_ALERT, "%s exiting due to fatal errors!",
734 if (NGIRCd_SignalQuit)
735 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
736 else if (NGIRCd_SignalRestart)
737 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
742 * Write a text string into the socket of a connection.
743 * This function automatically appends CR+LF to the string and validates that
744 * the result is a valid IRC message (oversized messages are shortened, for
745 * example). Then it calls the Conn_Write() function to do the actual sending.
746 * @param Idx Index fo the connection.
747 * @param Format Format string, see printf().
748 * @return true on success, false otherwise.
752 Conn_WriteStr( CONN_ID Idx, char *Format, ... )
755 Conn_WriteStr( Idx, Format, va_alist )
761 char buffer[COMMAND_LEN];
766 assert( Idx > NONE );
767 assert( Format != NULL );
770 va_start( ap, Format );
774 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
776 * The string that should be written to the socket is longer
777 * than the allowed size of COMMAND_LEN bytes (including both
778 * the CR and LF characters). This can be caused by the
779 * IRC_WriteXXX() functions when the prefix of this server had
780 * to be added to an already "quite long" command line which
781 * has been received from a regular IRC client, for example.
783 * We are not allowed to send such "oversized" messages to
784 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
785 * ("these messages SHALL NOT exceed 512 characters in length,
786 * counting all characters including the trailing CR-LF").
788 * So we have a big problem here: we should send more bytes
789 * to the network than we are allowed to and we don't know
790 * the originator (any more). The "old" behaviour of blaming
791 * the receiver ("next hop") is a bad idea (it could be just
792 * an other server only routing the message!), so the only
793 * option left is to shorten the string and to hope that the
794 * result is still somewhat useful ...
798 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
804 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
807 len = strlcat( buffer, "\r\n", sizeof( buffer ));
808 ok = Conn_Write(Idx, buffer, len);
809 My_Connections[Idx].msg_out++;
813 } /* Conn_WriteStr */
817 * Append Data to the outbound write buffer of a connection.
818 * @param Idx Index of the connection.
819 * @param Data pointer to the data.
820 * @param Len length of Data.
821 * @return true on success, false otherwise.
824 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
827 size_t writebuf_limit = WRITEBUFFER_LEN;
828 assert( Idx > NONE );
829 assert( Data != NULL );
832 c = Conn_GetClient(Idx);
835 /* Servers do get special write buffer limits, so they can generate
836 * all the messages that are required while peering. */
837 if (Client_Type(c) == CLIENT_SERVER)
838 writebuf_limit = WRITEBUFFER_SLINK_LEN;
840 /* Is the socket still open? A previous call to Conn_Write()
841 * may have closed the connection due to a fatal error.
842 * In this case it is sufficient to return an error, as well. */
843 if( My_Connections[Idx].sock <= NONE ) {
844 LogDebug("Skipped write on closed socket (connection %d).", Idx);
849 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
851 * Zip_Buffer() does all the dirty work for us: it flushes
852 * the (pre-)compression buffers if required and handles
853 * all error conditions. */
854 if (!Zip_Buffer(Idx, Data, Len))
860 /* Uncompressed link:
861 * Check if outbound buffer has enough space for the data. */
862 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
864 /* Buffer is full, flush it. Handle_Write deals with
865 * low-level errors, if any. */
866 if (!Handle_Write(Idx))
870 /* When the write buffer is still too big after flushing it,
871 * the connection will be killed. */
872 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
875 "Write buffer overflow (connection %d, size %lu byte)!",
877 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
878 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
882 /* Copy data to write buffer */
883 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
886 My_Connections[Idx].bytes_out += Len;
889 /* Adjust global write counter */
897 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
899 /* Close connection. Open pipes of asyncronous resolver
900 * sub-processes are closed down. */
907 double in_z_k, out_z_k;
911 assert( Idx > NONE );
913 /* Is this link already shutting down? */
914 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
915 /* Conn_Close() has been called recursively for this link;
916 * probabe reason: Handle_Write() failed -- see below. */
917 LogDebug("Recursive request to close connection: %d", Idx );
921 assert( My_Connections[Idx].sock > NONE );
923 /* Mark link as "closing" */
924 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
931 txt = "Reason unknown";
933 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
934 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
935 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
937 /* Search client, if any */
938 c = Conn_GetClient( Idx );
940 /* Should the client be informed? */
943 /* Send statistics to client if registered as user: */
944 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
946 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
947 Client_ID(Client_ThisServer()), Client_ID(c),
949 (double)My_Connections[Idx].bytes_in / 1024,
950 (double)My_Connections[Idx].bytes_out / 1024);
953 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
955 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
957 Conn_WriteStr(Idx, "ERROR :Closing connection.");
960 /* Try to write out the write buffer. Note: Handle_Write() eventually
961 * removes the CLIENT structure associated with this connection if an
962 * error occurs! So we have to re-check if there is still an valid
963 * CLIENT structure after calling Handle_Write() ...*/
964 (void)Handle_Write( Idx );
966 /* Search client, if any (re-check!) */
967 c = Conn_GetClient( Idx );
969 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
970 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
971 ConnSSL_Free(&My_Connections[Idx]);
974 /* Shut down socket */
975 if (! io_close(My_Connections[Idx].sock)) {
976 /* Oops, we can't close the socket!? This is ... ugly! */
978 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
979 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
980 port, strerror(errno));
983 /* Mark socket as invalid: */
984 My_Connections[Idx].sock = NONE;
986 /* If there is still a client, unregister it now */
988 Client_Destroy(c, LogMsg, FwdMsg, true);
990 /* Calculate statistics and log information */
991 in_k = (double)My_Connections[Idx].bytes_in / 1024;
992 out_k = (double)My_Connections[Idx].bytes_out / 1024;
994 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
995 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
996 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
997 /* Make sure that no division by zero can occur during
998 * the calculation of in_p and out_p: in_z_k and out_z_k
999 * are non-zero, that's guaranteed by the protocol until
1000 * compression can be enabled. */
1005 in_p = (int)(( in_k * 100 ) / in_z_k );
1006 out_p = (int)(( out_k * 100 ) / out_z_k );
1008 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1009 Idx, My_Connections[Idx].host, port,
1010 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1016 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1017 Idx, My_Connections[Idx].host, port,
1021 /* cancel running resolver */
1022 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
1023 Resolve_Shutdown(&My_Connections[Idx].res_stat);
1025 /* Servers: Modify time of next connect attempt? */
1026 Conf_UnsetServer( Idx );
1029 /* Clean up zlib, if link was compressed */
1030 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1031 inflateEnd( &My_Connections[Idx].zip.in );
1032 deflateEnd( &My_Connections[Idx].zip.out );
1033 array_free(&My_Connections[Idx].zip.rbuf);
1034 array_free(&My_Connections[Idx].zip.wbuf);
1038 array_free(&My_Connections[Idx].rbuf);
1039 array_free(&My_Connections[Idx].wbuf);
1041 /* Clean up connection structure (=free it) */
1042 Init_Conn_Struct( Idx );
1044 assert(NumConnections > 0);
1047 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1048 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1053 Conn_SyncServerStruct( void )
1055 /* Synchronize server structures (connection IDs):
1056 * connections <-> configuration */
1062 for( i = 0; i < Pool_Size; i++ ) {
1063 /* Established connection? */
1064 if (My_Connections[i].sock < 0)
1067 /* Server connection? */
1068 client = Conn_GetClient( i );
1069 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
1071 for( c = 0; c < MAX_SERVERS; c++ )
1073 /* Configured server? */
1074 if( ! Conf_Server[c].host[0] ) continue;
1077 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
1078 Conf_Server[c].conn_id = i;
1081 } /* SyncServerStruct */
1085 * Send out data of write buffer; connect new sockets.
1088 Handle_Write( CONN_ID Idx )
1093 assert( Idx > NONE );
1094 if ( My_Connections[Idx].sock < 0 ) {
1095 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1098 assert( My_Connections[Idx].sock > NONE );
1100 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1103 if (wdatalen == 0) {
1104 /* Write buffer is empty, so we try to flush the compression
1105 * buffer and get some data to work with from there :-) */
1106 if (!Zip_Flush(Idx))
1109 /* Now the write buffer most probably has changed: */
1110 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1114 if (wdatalen == 0) {
1115 /* Still no data, fine. */
1116 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1121 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1125 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1126 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1130 len = write(My_Connections[Idx].sock,
1131 array_start(&My_Connections[Idx].wbuf), wdatalen );
1134 if (errno == EAGAIN || errno == EINTR)
1137 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1138 Idx, My_Connections[Idx].sock, strerror(errno));
1139 Conn_Close(Idx, "Write error!", NULL, false);
1143 /* move any data not yet written to beginning */
1144 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1147 } /* Handle_Write */
1151 Count_Connections(ng_ipaddr_t *a)
1156 for (i = 0; i < Pool_Size; i++) {
1157 if (My_Connections[i].sock <= NONE)
1159 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1163 } /* Count_Connections */
1167 New_Connection( int Sock )
1169 /* Neue Client-Verbindung von Listen-Socket annehmen und
1170 * CLIENT-Struktur anlegen. */
1173 struct request_info req;
1175 ng_ipaddr_t new_addr;
1176 char ip_str[NG_INET_ADDRSTRLEN];
1177 int new_sock, new_sock_len, identsock;
1181 assert( Sock > NONE );
1182 /* Connection auf Listen-Socket annehmen */
1183 new_sock_len = (int)sizeof(new_addr);
1185 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1186 (socklen_t *)&new_sock_len);
1188 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1192 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1193 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1194 Simple_Message(new_sock, "ERROR :Internal Server Error");
1200 /* Validate socket using TCP Wrappers */
1201 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
1203 if (!hosts_access(&req)) {
1204 Log (deny_severity, "Refused connection from %s (by TCP Wrappers)!", ip_str);
1205 Simple_Message( new_sock, "ERROR :Connection refused" );
1211 /* Socket initialisieren */
1212 if (!Init_Socket( new_sock ))
1215 /* Check IP-based connection limit */
1216 cnt = Count_Connections(&new_addr);
1217 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1218 /* Access denied, too many connections from this IP address! */
1219 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", ip_str, cnt);
1220 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
1225 if ((Conf_MaxConnections > 0) &&
1226 (NumConnections >= (size_t) Conf_MaxConnections))
1228 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Conf_MaxConnections);
1229 Simple_Message( new_sock, "ERROR :Connection limit reached" );
1234 if( new_sock >= Pool_Size ) {
1235 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1236 (size_t)new_sock)) {
1237 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
1238 Simple_Message( new_sock, "ERROR: Internal error" );
1242 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1243 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1245 /* Adjust pointer to new block */
1246 My_Connections = array_start(&My_ConnArray);
1247 while (Pool_Size <= new_sock)
1248 Init_Conn_Struct(Pool_Size++);
1251 /* register callback */
1252 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
1253 Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
1254 Simple_Message(new_sock, "ERROR :Internal error");
1259 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false );
1261 Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
1262 Simple_Message(new_sock, "ERROR :Internal error");
1267 Init_Conn_Struct( new_sock );
1268 My_Connections[new_sock].sock = new_sock;
1269 My_Connections[new_sock].addr = new_addr;
1270 My_Connections[new_sock].client = c;
1272 /* Set initial hostname to IP address. This becomes overwritten when
1273 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1274 if (ng_ipaddr_af(&new_addr) != AF_INET)
1275 snprintf(My_Connections[new_sock].host,
1276 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1278 strlcpy(My_Connections[new_sock].host, ip_str,
1279 sizeof(My_Connections[new_sock].host));
1281 Client_SetHostname(c, My_Connections[new_sock].host);
1283 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1284 new_sock, My_Connections[new_sock].host,
1285 ng_ipaddr_getport(&new_addr), Sock);
1287 identsock = new_sock;
1293 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1294 identsock, cb_Read_Resolver_Result);
1295 Conn_SetPenalty(new_sock, 4);
1297 } /* New_Connection */
1301 Socket2Index( int Sock )
1303 assert( Sock >= 0 );
1305 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1306 /* the Connection was already closed again, likely due to
1308 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1312 } /* Socket2Index */
1316 * Read data from the network to the read buffer. If an error occures,
1317 * the socket of this connection will be shut down.
1320 Read_Request( CONN_ID Idx )
1323 static const unsigned int maxbps = COMMAND_LEN / 2;
1324 char readbuf[READBUFFER_LEN];
1327 assert( Idx > NONE );
1328 assert( My_Connections[Idx].sock > NONE );
1331 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1332 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1334 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1337 /* Read buffer is full */
1339 "Receive buffer overflow (connection %d): %d bytes!",
1340 Idx, array_bytes(&My_Connections[Idx].rbuf));
1341 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1346 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1347 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1350 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1352 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1353 My_Connections[Idx].host,
1354 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1355 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1357 "Socket closed!", "Client closed connection",
1363 if( errno == EAGAIN ) return;
1364 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1365 Idx, My_Connections[Idx].sock, strerror(errno));
1366 Conn_Close(Idx, "Read error!", "Client closed connection",
1371 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1372 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1375 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1377 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1384 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1385 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1386 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1390 /* Update connection statistics */
1391 My_Connections[Idx].bytes_in += len;
1393 /* Update timestamp of last data received if this connection is
1394 * registered as a user, server or service connection. Don't update
1395 * otherwise, so users have at least Conf_PongTimeout seconds time to
1396 * register with the IRC server -- see Check_Connections().
1397 * Set "lastping", too, so we can handle time shifts backwards ... */
1398 c = Conn_GetClient(Idx);
1399 if (c && (Client_Type(c) == CLIENT_USER
1400 || Client_Type(c) == CLIENT_SERVER
1401 || Client_Type(c) == CLIENT_SERVICE)) {
1403 if (My_Connections[Idx].lastdata != t)
1404 My_Connections[Idx].bps = 0;
1406 My_Connections[Idx].lastdata = t;
1407 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1410 /* Look at the data in the (read-) buffer of this connection */
1411 My_Connections[Idx].bps += Handle_Buffer(Idx);
1412 if (Client_Type(c) != CLIENT_SERVER
1413 && My_Connections[Idx].bps >= maxbps) {
1414 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1415 Idx, My_Connections[Idx].bps, maxbps);
1416 Conn_SetPenalty(Idx, 1);
1418 } /* Read_Request */
1422 * Handle all data in the connection read-buffer.
1423 * Data is processed until no complete command is left in the read buffer,
1424 * or MAX_COMMANDS[_SERVER] commands were processed.
1425 * When a fatal error occurs, the connection is shut down.
1426 * @param Idx Index of the connection.
1427 * @return number of bytes processed.
1430 Handle_Buffer(CONN_ID Idx)
1433 char *ptr1, *ptr2, *first_eol;
1441 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1444 c = Conn_GetClient(Idx);
1447 /* Servers do get special command limits, so they can process
1448 * all the messages that are required while peering. */
1449 if (Client_Type(c) == CLIENT_SERVER)
1450 maxcmd = MAX_COMMANDS_SERVER;
1452 starttime = time(NULL);
1453 for (i=0; i < maxcmd; i++) {
1455 if (My_Connections[Idx].delaytime > starttime)
1458 /* Unpack compressed data, if compression is in use */
1459 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1460 /* When unzipping fails, Unzip_Buffer() shuts
1461 * down the connection itself */
1462 if (!Unzip_Buffer(Idx))
1467 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1470 /* Make sure that the buffer is NULL terminated */
1471 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1472 Conn_Close(Idx, NULL,
1473 "Can't allocate memory [Handle_Buffer]",
1478 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1479 * "IRC messages are always lines of characters terminated
1480 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1482 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1485 /* Check for non-RFC-compliant request (only CR or LF)?
1486 * Unfortunately, there are quite a few clients out there
1487 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1488 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1489 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1491 /* Check if there is a single CR or LF _before_ the
1492 * corerct CR+LF line terminator: */
1493 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1494 if (first_eol < ptr) {
1495 /* Single CR or LF before CR+LF found */
1499 } else if (ptr1 || ptr2) {
1500 /* No CR+LF terminated command found, but single
1501 * CR or LF found ... */
1503 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1505 ptr = ptr1 ? ptr1 : ptr2;
1513 /* Complete (=line terminated) request found, handle it! */
1516 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1518 if (len > (COMMAND_LEN - 1)) {
1519 /* Request must not exceed 512 chars (incl. CR+LF!),
1520 * see RFC 2812. Disconnect Client if this happens. */
1522 "Request too long (connection %d): %d bytes (max. %d expected)!",
1523 Idx, array_bytes(&My_Connections[Idx].rbuf),
1525 Conn_Close(Idx, NULL, "Request too long", true);
1529 len_processed += len;
1531 /* Request is empty (only '\r\n', '\r' or '\n');
1532 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1533 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1537 /* remember if stream is already compressed */
1538 old_z = My_Connections[Idx].options & CONN_ZIP;
1541 My_Connections[Idx].msg_in++;
1543 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1544 return 0; /* error -> connection has been closed */
1546 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1547 LogDebug("Connection %d: %d bytes left in read buffer.",
1548 Idx, array_bytes(&My_Connections[Idx].rbuf));
1550 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1551 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1552 /* The last command activated socket compression.
1553 * Data that was read after that needs to be copied
1554 * to the unzip buffer for decompression: */
1556 (&My_Connections[Idx].zip.rbuf,
1557 &My_Connections[Idx].rbuf)) {
1558 Conn_Close(Idx, NULL,
1559 "Can't allocate memory [Handle_Buffer]",
1564 array_trunc(&My_Connections[Idx].rbuf);
1566 ("Moved already received data (%u bytes) to uncompression buffer.",
1567 array_bytes(&My_Connections[Idx].zip.rbuf));
1571 return len_processed;
1572 } /* Handle_Buffer */
1576 Check_Connections(void)
1578 /* check if connections are alive. if not, play PING-PONG first.
1579 * if this doesn't help either, disconnect client. */
1584 for (i = 0; i < Pool_Size; i++) {
1585 if (My_Connections[i].sock < 0)
1588 c = Conn_GetClient(i);
1589 if (c && ((Client_Type(c) == CLIENT_USER)
1590 || (Client_Type(c) == CLIENT_SERVER)
1591 || (Client_Type(c) == CLIENT_SERVICE))) {
1592 /* connected User, Server or Service */
1593 if (My_Connections[i].lastping >
1594 My_Connections[i].lastdata) {
1595 /* We already sent a ping */
1596 if (My_Connections[i].lastping <
1597 time(NULL) - Conf_PongTimeout) {
1600 ("Connection %d: Ping timeout: %d seconds.",
1601 i, Conf_PongTimeout);
1602 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1603 Conn_Close(i, NULL, msg, true);
1605 } else if (My_Connections[i].lastdata <
1606 time(NULL) - Conf_PingTimeout) {
1607 /* We need to send a PING ... */
1608 LogDebug("Connection %d: sending PING ...", i);
1609 My_Connections[i].lastping = time(NULL);
1610 Conn_WriteStr(i, "PING :%s",
1611 Client_ID(Client_ThisServer()));
1614 /* The connection is not fully established yet, so
1615 * we don't do the PING-PONG game here but instead
1616 * disconnect the client after "a short time" if it's
1617 * still not registered. */
1619 if (My_Connections[i].lastdata <
1620 time(NULL) - Conf_PongTimeout) {
1622 ("Unregistered connection %d timed out ...",
1624 Conn_Close(i, NULL, "Timeout", false);
1628 } /* Check_Connections */
1632 Check_Servers( void )
1634 /* Check if we can establish further server links */
1639 /* Check all configured servers */
1640 for( i = 0; i < MAX_SERVERS; i++ ) {
1641 /* Valid outgoing server which isn't already connected or disabled? */
1642 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1643 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1646 /* Is there already a connection in this group? */
1647 if( Conf_Server[i].group > NONE ) {
1648 for (n = 0; n < MAX_SERVERS; n++) {
1649 if (n == i) continue;
1650 if ((Conf_Server[n].conn_id != NONE) &&
1651 (Conf_Server[n].group == Conf_Server[i].group))
1654 if (n < MAX_SERVERS) continue;
1657 /* Check last connect attempt? */
1658 time_now = time(NULL);
1659 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1662 /* Okay, try to connect now */
1663 Conf_Server[i].lasttry = time_now;
1664 Conf_Server[i].conn_id = SERVER_WAIT;
1665 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1666 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1668 } /* Check_Servers */
1672 New_Server( int Server , ng_ipaddr_t *dest)
1674 /* Establish new server link */
1675 char ip_str[NG_INET_ADDRSTRLEN];
1676 int af_dest, res, new_sock;
1679 assert( Server > NONE );
1681 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1682 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1686 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1687 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1689 af_dest = ng_ipaddr_af(dest);
1690 new_sock = socket(af_dest, SOCK_STREAM, 0);
1692 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1696 if (!Init_Socket(new_sock))
1699 /* is a bind address configured? */
1700 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1701 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1702 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1703 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1705 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1706 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1708 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1709 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1710 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1711 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1716 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1718 "Cannot allocate memory for server connection (socket %d)",
1724 My_Connections = array_start(&My_ConnArray);
1726 assert(My_Connections[new_sock].sock <= 0);
1728 Init_Conn_Struct(new_sock);
1730 ng_ipaddr_tostr_r(dest, ip_str);
1731 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1733 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1738 /* Conn_Close() decrements this counter again */
1740 Client_SetIntroducer( c, c );
1741 Client_SetToken( c, TOKEN_OUTBOUND );
1743 /* Register connection */
1744 Conf_Server[Server].conn_id = new_sock;
1745 My_Connections[new_sock].sock = new_sock;
1746 My_Connections[new_sock].addr = *dest;
1747 My_Connections[new_sock].client = c;
1748 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1749 sizeof(My_Connections[new_sock].host ));
1751 /* Register new socket */
1752 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1753 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1754 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1755 Init_Conn_Struct( new_sock );
1756 Conf_Server[Server].conn_id = NONE;
1759 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1760 &Conf_Server[Server] ))
1762 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1763 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1764 Init_Conn_Struct( new_sock );
1765 Conf_Server[Server].conn_id = NONE;
1769 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1770 new_sock, My_Connections[new_sock].sock, NumConnections);
1771 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1776 * Initialize connection structure.
1779 Init_Conn_Struct(CONN_ID Idx)
1781 time_t now = time(NULL);
1783 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1784 My_Connections[Idx].sock = -1;
1785 My_Connections[Idx].signon = now;
1786 My_Connections[Idx].lastdata = now;
1787 My_Connections[Idx].lastprivmsg = now;
1788 Resolve_Init(&My_Connections[Idx].res_stat);
1789 } /* Init_Conn_Struct */
1793 Init_Socket( int Sock )
1795 /* Initialize socket (set options) */
1799 if (!io_setnonblock(Sock)) {
1800 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1805 /* Don't block this port after socket shutdown */
1807 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1809 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1810 /* ignore this error */
1813 /* Set type of service (TOS) */
1814 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1815 value = IPTOS_LOWDELAY;
1816 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1817 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1819 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1820 /* ignore this error */
1830 cb_Connect_to_Server(int fd, UNUSED short events)
1832 /* Read result of resolver sub-process from pipe and start connection */
1835 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1836 four so we can log the 'more than we can handle'
1839 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1841 for (i=0; i < MAX_SERVERS; i++) {
1842 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1846 if( i >= MAX_SERVERS) {
1847 /* Ops, no matching server found?! */
1849 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1853 /* Read result from pipe */
1854 len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1858 assert((len % sizeof(ng_ipaddr_t)) == 0);
1860 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1862 memset(&Conf_Server[i].dst_addr, 0, sizeof(&Conf_Server[i].dst_addr));
1863 if (len > sizeof(ng_ipaddr_t)) {
1864 /* more than one address for this hostname, remember them
1865 * in case first address is unreachable/not available */
1866 len -= sizeof(ng_ipaddr_t);
1867 if (len > sizeof(&Conf_Server[i].dst_addr)) {
1868 len = sizeof(&Conf_Server[i].dst_addr);
1870 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1872 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1875 New_Server(i, dest_addrs);
1876 } /* cb_Read_Forward_Lookup */
1880 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1882 /* Read result of resolver sub-process from pipe and update the
1883 * apropriate connection/client structure(s): hostname and/or
1884 * IDENT user name.*/
1891 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1893 char readbuf[HOST_LEN + 1];
1896 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1898 /* Search associated connection ... */
1899 for( i = 0; i < Pool_Size; i++ ) {
1900 if(( My_Connections[i].sock != NONE )
1901 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1904 if( i >= Pool_Size ) {
1905 /* Ops, none found? Probably the connection has already
1906 * been closed!? We'll ignore that ... */
1908 LogDebug("Resolver: Got callback for unknown connection!?");
1912 /* Read result from pipe */
1913 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1917 readbuf[len] = '\0';
1918 identptr = strchr(readbuf, '\n');
1919 assert(identptr != NULL);
1921 Log( LOG_CRIT, "Resolver: Got malformed result!");
1926 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1927 /* Okay, we got a complete result: this is a host name for outgoing
1928 * connections and a host name and IDENT user name (if enabled) for
1929 * incoming connections.*/
1930 assert ( My_Connections[i].sock >= 0 );
1931 /* Incoming connection. Search client ... */
1932 c = Conn_GetClient( i );
1933 assert( c != NULL );
1935 /* Only update client information of unregistered clients */
1936 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1937 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1938 Client_SetHostname( c, readbuf);
1942 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
1943 Client_SetUser(c, identptr, true);
1945 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
1950 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1952 /* Reset penalty time */
1953 Conn_ResetPenalty( i );
1954 } /* cb_Read_Resolver_Result */
1958 Simple_Message( int Sock, const char *Msg )
1960 char buf[COMMAND_LEN];
1962 /* Write "simple" message to socket, without using compression
1963 * or even the connection write buffers. Used e.g. for error
1964 * messages by New_Connection(). */
1965 assert( Sock > NONE );
1966 assert( Msg != NULL );
1968 strlcpy( buf, Msg, sizeof buf - 2);
1969 len = strlcat( buf, "\r\n", sizeof buf);
1970 (void)write(Sock, buf, len);
1971 } /* Simple_Error */
1975 Conn_GetClient( CONN_ID Idx )
1977 /* return Client-Structure that belongs to the local Connection Idx.
1978 * If none is found, return NULL.
1983 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
1987 return c ? c->client : NULL;
1991 /* we cannot access My_Connections in irc-info.c */
1993 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
1997 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
1998 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2003 Conn_UsesSSL(CONN_ID Idx)
2007 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2008 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);