2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2009 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 = (socklen_t)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, (socklen_t)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. */
906 double in_z_k, out_z_k;
910 assert( Idx > NONE );
912 /* Is this link already shutting down? */
913 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
914 /* Conn_Close() has been called recursively for this link;
915 * probabe reason: Handle_Write() failed -- see below. */
916 LogDebug("Recursive request to close connection: %d", Idx );
920 assert( My_Connections[Idx].sock > NONE );
922 /* Mark link as "closing" */
923 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
925 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
926 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
927 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
929 /* Search client, if any */
930 c = Conn_GetClient( Idx );
932 /* Should the client be informed? */
935 /* Send statistics to client if registered as user: */
936 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
938 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
939 Client_ID(Client_ThisServer()), Client_ID(c),
941 (double)My_Connections[Idx].bytes_in / 1024,
942 (double)My_Connections[Idx].bytes_out / 1024);
945 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
947 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
949 Conn_WriteStr(Idx, "ERROR :Closing connection.");
952 /* Try to write out the write buffer. Note: Handle_Write() eventually
953 * removes the CLIENT structure associated with this connection if an
954 * error occurs! So we have to re-check if there is still an valid
955 * CLIENT structure after calling Handle_Write() ...*/
956 (void)Handle_Write( Idx );
958 /* Search client, if any (re-check!) */
959 c = Conn_GetClient( Idx );
961 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
962 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
963 ConnSSL_Free(&My_Connections[Idx]);
966 /* Shut down socket */
967 if (! io_close(My_Connections[Idx].sock)) {
968 /* Oops, we can't close the socket!? This is ... ugly! */
970 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
971 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
972 port, strerror(errno));
975 /* Mark socket as invalid: */
976 My_Connections[Idx].sock = NONE;
978 /* If there is still a client, unregister it now */
980 Client_Destroy(c, LogMsg, FwdMsg, true);
982 /* Calculate statistics and log information */
983 in_k = (double)My_Connections[Idx].bytes_in / 1024;
984 out_k = (double)My_Connections[Idx].bytes_out / 1024;
986 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
987 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
988 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
989 /* Make sure that no division by zero can occur during
990 * the calculation of in_p and out_p: in_z_k and out_z_k
991 * are non-zero, that's guaranteed by the protocol until
992 * compression can be enabled. */
997 in_p = (int)(( in_k * 100 ) / in_z_k );
998 out_p = (int)(( out_k * 100 ) / out_z_k );
1000 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1001 Idx, My_Connections[Idx].host, port,
1002 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1008 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1009 Idx, My_Connections[Idx].host, port,
1013 /* cancel running resolver */
1014 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
1015 Resolve_Shutdown(&My_Connections[Idx].res_stat);
1017 /* Servers: Modify time of next connect attempt? */
1018 Conf_UnsetServer( Idx );
1021 /* Clean up zlib, if link was compressed */
1022 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1023 inflateEnd( &My_Connections[Idx].zip.in );
1024 deflateEnd( &My_Connections[Idx].zip.out );
1025 array_free(&My_Connections[Idx].zip.rbuf);
1026 array_free(&My_Connections[Idx].zip.wbuf);
1030 array_free(&My_Connections[Idx].rbuf);
1031 array_free(&My_Connections[Idx].wbuf);
1033 /* Clean up connection structure (=free it) */
1034 Init_Conn_Struct( Idx );
1036 assert(NumConnections > 0);
1039 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1040 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1045 Conn_SyncServerStruct( void )
1047 /* Synchronize server structures (connection IDs):
1048 * connections <-> configuration */
1054 for( i = 0; i < Pool_Size; i++ ) {
1055 /* Established connection? */
1056 if (My_Connections[i].sock < 0)
1059 /* Server connection? */
1060 client = Conn_GetClient( i );
1061 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
1063 for( c = 0; c < MAX_SERVERS; c++ )
1065 /* Configured server? */
1066 if( ! Conf_Server[c].host[0] ) continue;
1069 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
1070 Conf_Server[c].conn_id = i;
1073 } /* SyncServerStruct */
1077 * Send out data of write buffer; connect new sockets.
1080 Handle_Write( CONN_ID Idx )
1085 assert( Idx > NONE );
1086 if ( My_Connections[Idx].sock < 0 ) {
1087 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1090 assert( My_Connections[Idx].sock > NONE );
1092 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1095 if (wdatalen == 0) {
1096 /* Write buffer is empty, so we try to flush the compression
1097 * buffer and get some data to work with from there :-) */
1098 if (!Zip_Flush(Idx))
1101 /* Now the write buffer most probably has changed: */
1102 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1106 if (wdatalen == 0) {
1107 /* Still no data, fine. */
1108 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1113 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1117 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1118 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1122 len = write(My_Connections[Idx].sock,
1123 array_start(&My_Connections[Idx].wbuf), wdatalen );
1126 if (errno == EAGAIN || errno == EINTR)
1129 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1130 Idx, My_Connections[Idx].sock, strerror(errno));
1131 Conn_Close(Idx, "Write error!", NULL, false);
1135 /* move any data not yet written to beginning */
1136 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1139 } /* Handle_Write */
1143 Count_Connections(ng_ipaddr_t *a)
1148 for (i = 0; i < Pool_Size; i++) {
1149 if (My_Connections[i].sock <= NONE)
1151 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1155 } /* Count_Connections */
1159 New_Connection( int Sock )
1161 /* Neue Client-Verbindung von Listen-Socket annehmen und
1162 * CLIENT-Struktur anlegen. */
1165 struct request_info req;
1167 ng_ipaddr_t new_addr;
1168 char ip_str[NG_INET_ADDRSTRLEN];
1169 int new_sock, new_sock_len, identsock;
1173 assert( Sock > NONE );
1174 /* Connection auf Listen-Socket annehmen */
1175 new_sock_len = (int)sizeof(new_addr);
1177 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1178 (socklen_t *)&new_sock_len);
1180 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1184 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1185 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1186 Simple_Message(new_sock, "ERROR :Internal Server Error");
1192 /* Validate socket using TCP Wrappers */
1193 request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
1195 if (!hosts_access(&req)) {
1196 Log (deny_severity, "Refused connection from %s (by TCP Wrappers)!", ip_str);
1197 Simple_Message( new_sock, "ERROR :Connection refused" );
1203 /* Socket initialisieren */
1204 if (!Init_Socket( new_sock ))
1207 /* Check IP-based connection limit */
1208 cnt = Count_Connections(&new_addr);
1209 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1210 /* Access denied, too many connections from this IP address! */
1211 Log( LOG_ERR, "Refused connection from %s: too may connections (%ld) from this IP address!", ip_str, cnt);
1212 Simple_Message( new_sock, "ERROR :Connection refused, too many connections from your IP address!" );
1217 if ((Conf_MaxConnections > 0) &&
1218 (NumConnections >= (size_t) Conf_MaxConnections))
1220 Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Conf_MaxConnections);
1221 Simple_Message( new_sock, "ERROR :Connection limit reached" );
1226 if( new_sock >= Pool_Size ) {
1227 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1228 (size_t)new_sock)) {
1229 Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
1230 Simple_Message( new_sock, "ERROR: Internal error" );
1234 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1235 new_sock, array_length(&My_ConnArray, sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1237 /* Adjust pointer to new block */
1238 My_Connections = array_start(&My_ConnArray);
1239 while (Pool_Size <= new_sock)
1240 Init_Conn_Struct(Pool_Size++);
1243 /* register callback */
1244 if (!io_event_create( new_sock, IO_WANTREAD, cb_clientserver)) {
1245 Log(LOG_ALERT, "Can't accept connection: io_event_create failed!");
1246 Simple_Message(new_sock, "ERROR :Internal error");
1251 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false );
1253 Log(LOG_ALERT, "Can't accept connection: can't create client structure!");
1254 Simple_Message(new_sock, "ERROR :Internal error");
1259 Init_Conn_Struct( new_sock );
1260 My_Connections[new_sock].sock = new_sock;
1261 My_Connections[new_sock].addr = new_addr;
1262 My_Connections[new_sock].client = c;
1264 /* Set initial hostname to IP address. This becomes overwritten when
1265 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1266 if (ng_ipaddr_af(&new_addr) != AF_INET)
1267 snprintf(My_Connections[new_sock].host,
1268 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1270 strlcpy(My_Connections[new_sock].host, ip_str,
1271 sizeof(My_Connections[new_sock].host));
1273 Client_SetHostname(c, My_Connections[new_sock].host);
1275 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1276 new_sock, My_Connections[new_sock].host,
1277 ng_ipaddr_getport(&new_addr), Sock);
1279 identsock = new_sock;
1285 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1286 identsock, cb_Read_Resolver_Result);
1287 Conn_SetPenalty(new_sock, 4);
1289 } /* New_Connection */
1293 Socket2Index( int Sock )
1295 assert( Sock >= 0 );
1297 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1298 /* the Connection was already closed again, likely due to
1300 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1304 } /* Socket2Index */
1308 * Read data from the network to the read buffer. If an error occures,
1309 * the socket of this connection will be shut down.
1312 Read_Request( CONN_ID Idx )
1315 static const unsigned int maxbps = COMMAND_LEN / 2;
1316 char readbuf[READBUFFER_LEN];
1319 assert( Idx > NONE );
1320 assert( My_Connections[Idx].sock > NONE );
1323 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1324 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1326 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1329 /* Read buffer is full */
1331 "Receive buffer overflow (connection %d): %d bytes!",
1332 Idx, array_bytes(&My_Connections[Idx].rbuf));
1333 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1338 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1339 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1342 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1344 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1345 My_Connections[Idx].host,
1346 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1347 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1349 "Socket closed!", "Client closed connection",
1355 if( errno == EAGAIN ) return;
1356 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1357 Idx, My_Connections[Idx].sock, strerror(errno));
1358 Conn_Close(Idx, "Read error!", "Client closed connection",
1363 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1364 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1367 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1369 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1376 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1377 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1378 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1382 /* Update connection statistics */
1383 My_Connections[Idx].bytes_in += len;
1385 /* Update timestamp of last data received if this connection is
1386 * registered as a user, server or service connection. Don't update
1387 * otherwise, so users have at least Conf_PongTimeout seconds time to
1388 * register with the IRC server -- see Check_Connections().
1389 * Set "lastping", too, so we can handle time shifts backwards ... */
1390 c = Conn_GetClient(Idx);
1391 if (c && (Client_Type(c) == CLIENT_USER
1392 || Client_Type(c) == CLIENT_SERVER
1393 || Client_Type(c) == CLIENT_SERVICE)) {
1395 if (My_Connections[Idx].lastdata != t)
1396 My_Connections[Idx].bps = 0;
1398 My_Connections[Idx].lastdata = t;
1399 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1402 /* Look at the data in the (read-) buffer of this connection */
1403 My_Connections[Idx].bps += Handle_Buffer(Idx);
1404 if (Client_Type(c) != CLIENT_SERVER
1405 && My_Connections[Idx].bps >= maxbps) {
1406 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1407 Idx, My_Connections[Idx].bps, maxbps);
1408 Conn_SetPenalty(Idx, 1);
1410 } /* Read_Request */
1414 * Handle all data in the connection read-buffer.
1415 * Data is processed until no complete command is left in the read buffer,
1416 * or MAX_COMMANDS[_SERVER] commands were processed.
1417 * When a fatal error occurs, the connection is shut down.
1418 * @param Idx Index of the connection.
1419 * @return number of bytes processed.
1422 Handle_Buffer(CONN_ID Idx)
1425 char *ptr1, *ptr2, *first_eol;
1433 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1436 c = Conn_GetClient(Idx);
1439 /* Servers do get special command limits, so they can process
1440 * all the messages that are required while peering. */
1441 if (Client_Type(c) == CLIENT_SERVER)
1442 maxcmd = MAX_COMMANDS_SERVER;
1444 starttime = time(NULL);
1445 for (i=0; i < maxcmd; i++) {
1447 if (My_Connections[Idx].delaytime > starttime)
1450 /* Unpack compressed data, if compression is in use */
1451 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1452 /* When unzipping fails, Unzip_Buffer() shuts
1453 * down the connection itself */
1454 if (!Unzip_Buffer(Idx))
1459 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1462 /* Make sure that the buffer is NULL terminated */
1463 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1464 Conn_Close(Idx, NULL,
1465 "Can't allocate memory [Handle_Buffer]",
1470 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1471 * "IRC messages are always lines of characters terminated
1472 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1474 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1477 /* Check for non-RFC-compliant request (only CR or LF)?
1478 * Unfortunately, there are quite a few clients out there
1479 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1480 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1481 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1483 /* Check if there is a single CR or LF _before_ the
1484 * corerct CR+LF line terminator: */
1485 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1486 if (first_eol < ptr) {
1487 /* Single CR or LF before CR+LF found */
1491 } else if (ptr1 || ptr2) {
1492 /* No CR+LF terminated command found, but single
1493 * CR or LF found ... */
1495 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1497 ptr = ptr1 ? ptr1 : ptr2;
1505 /* Complete (=line terminated) request found, handle it! */
1508 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1510 if (len > (COMMAND_LEN - 1)) {
1511 /* Request must not exceed 512 chars (incl. CR+LF!),
1512 * see RFC 2812. Disconnect Client if this happens. */
1514 "Request too long (connection %d): %d bytes (max. %d expected)!",
1515 Idx, array_bytes(&My_Connections[Idx].rbuf),
1517 Conn_Close(Idx, NULL, "Request too long", true);
1521 len_processed += (unsigned int)len;
1523 /* Request is empty (only '\r\n', '\r' or '\n');
1524 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1525 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1529 /* remember if stream is already compressed */
1530 old_z = My_Connections[Idx].options & CONN_ZIP;
1533 My_Connections[Idx].msg_in++;
1535 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1536 return 0; /* error -> connection has been closed */
1538 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1539 LogDebug("Connection %d: %d bytes left in read buffer.",
1540 Idx, array_bytes(&My_Connections[Idx].rbuf));
1542 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1543 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1544 /* The last command activated socket compression.
1545 * Data that was read after that needs to be copied
1546 * to the unzip buffer for decompression: */
1548 (&My_Connections[Idx].zip.rbuf,
1549 &My_Connections[Idx].rbuf)) {
1550 Conn_Close(Idx, NULL,
1551 "Can't allocate memory [Handle_Buffer]",
1556 array_trunc(&My_Connections[Idx].rbuf);
1558 ("Moved already received data (%u bytes) to uncompression buffer.",
1559 array_bytes(&My_Connections[Idx].zip.rbuf));
1563 return len_processed;
1564 } /* Handle_Buffer */
1568 Check_Connections(void)
1570 /* check if connections are alive. if not, play PING-PONG first.
1571 * if this doesn't help either, disconnect client. */
1576 for (i = 0; i < Pool_Size; i++) {
1577 if (My_Connections[i].sock < 0)
1580 c = Conn_GetClient(i);
1581 if (c && ((Client_Type(c) == CLIENT_USER)
1582 || (Client_Type(c) == CLIENT_SERVER)
1583 || (Client_Type(c) == CLIENT_SERVICE))) {
1584 /* connected User, Server or Service */
1585 if (My_Connections[i].lastping >
1586 My_Connections[i].lastdata) {
1587 /* We already sent a ping */
1588 if (My_Connections[i].lastping <
1589 time(NULL) - Conf_PongTimeout) {
1592 ("Connection %d: Ping timeout: %d seconds.",
1593 i, Conf_PongTimeout);
1594 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1595 Conn_Close(i, NULL, msg, true);
1597 } else if (My_Connections[i].lastdata <
1598 time(NULL) - Conf_PingTimeout) {
1599 /* We need to send a PING ... */
1600 LogDebug("Connection %d: sending PING ...", i);
1601 My_Connections[i].lastping = time(NULL);
1602 Conn_WriteStr(i, "PING :%s",
1603 Client_ID(Client_ThisServer()));
1606 /* The connection is not fully established yet, so
1607 * we don't do the PING-PONG game here but instead
1608 * disconnect the client after "a short time" if it's
1609 * still not registered. */
1611 if (My_Connections[i].lastdata <
1612 time(NULL) - Conf_PongTimeout) {
1614 ("Unregistered connection %d timed out ...",
1616 Conn_Close(i, NULL, "Timeout", false);
1620 } /* Check_Connections */
1624 Check_Servers( void )
1626 /* Check if we can establish further server links */
1631 /* Check all configured servers */
1632 for( i = 0; i < MAX_SERVERS; i++ ) {
1633 /* Valid outgoing server which isn't already connected or disabled? */
1634 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1635 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1638 /* Is there already a connection in this group? */
1639 if( Conf_Server[i].group > NONE ) {
1640 for (n = 0; n < MAX_SERVERS; n++) {
1641 if (n == i) continue;
1642 if ((Conf_Server[n].conn_id != NONE) &&
1643 (Conf_Server[n].group == Conf_Server[i].group))
1646 if (n < MAX_SERVERS) continue;
1649 /* Check last connect attempt? */
1650 time_now = time(NULL);
1651 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1654 /* Okay, try to connect now */
1655 Conf_Server[i].lasttry = time_now;
1656 Conf_Server[i].conn_id = SERVER_WAIT;
1657 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1658 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1660 } /* Check_Servers */
1664 New_Server( int Server , ng_ipaddr_t *dest)
1666 /* Establish new server link */
1667 char ip_str[NG_INET_ADDRSTRLEN];
1668 int af_dest, res, new_sock;
1671 assert( Server > NONE );
1673 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1674 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1678 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1679 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1681 af_dest = ng_ipaddr_af(dest);
1682 new_sock = socket(af_dest, SOCK_STREAM, 0);
1684 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1688 if (!Init_Socket(new_sock))
1691 /* is a bind address configured? */
1692 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1693 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1694 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1695 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1697 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1698 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1700 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1701 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1702 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1703 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1708 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1710 "Cannot allocate memory for server connection (socket %d)",
1716 My_Connections = array_start(&My_ConnArray);
1718 assert(My_Connections[new_sock].sock <= 0);
1720 Init_Conn_Struct(new_sock);
1722 ng_ipaddr_tostr_r(dest, ip_str);
1723 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1725 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1730 /* Conn_Close() decrements this counter again */
1732 Client_SetIntroducer( c, c );
1733 Client_SetToken( c, TOKEN_OUTBOUND );
1735 /* Register connection */
1736 Conf_Server[Server].conn_id = new_sock;
1737 My_Connections[new_sock].sock = new_sock;
1738 My_Connections[new_sock].addr = *dest;
1739 My_Connections[new_sock].client = c;
1740 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1741 sizeof(My_Connections[new_sock].host ));
1743 /* Register new socket */
1744 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1745 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1746 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1747 Init_Conn_Struct( new_sock );
1748 Conf_Server[Server].conn_id = NONE;
1751 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1752 &Conf_Server[Server] ))
1754 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1755 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1756 Init_Conn_Struct( new_sock );
1757 Conf_Server[Server].conn_id = NONE;
1761 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1762 new_sock, My_Connections[new_sock].sock, NumConnections);
1763 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1768 * Initialize connection structure.
1771 Init_Conn_Struct(CONN_ID Idx)
1773 time_t now = time(NULL);
1775 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1776 My_Connections[Idx].sock = -1;
1777 My_Connections[Idx].signon = now;
1778 My_Connections[Idx].lastdata = now;
1779 My_Connections[Idx].lastprivmsg = now;
1780 Resolve_Init(&My_Connections[Idx].res_stat);
1781 } /* Init_Conn_Struct */
1785 Init_Socket( int Sock )
1787 /* Initialize socket (set options) */
1791 if (!io_setnonblock(Sock)) {
1792 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1797 /* Don't block this port after socket shutdown */
1799 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1801 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1802 /* ignore this error */
1805 /* Set type of service (TOS) */
1806 #if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
1807 value = IPTOS_LOWDELAY;
1808 LogDebug("Setting option IP_TOS on socket %d to IPTOS_LOWDELAY (%d).", Sock, value );
1809 if( setsockopt( Sock, SOL_IP, IP_TOS, &value, (socklen_t)sizeof( value )) != 0 )
1811 Log( LOG_ERR, "Can't set socket option IP_TOS: %s!", strerror( errno ));
1812 /* ignore this error */
1822 cb_Connect_to_Server(int fd, UNUSED short events)
1824 /* Read result of resolver sub-process from pipe and start connection */
1827 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1828 four so we can log the 'more than we can handle'
1829 condition. First result is tried immediately, rest
1830 is saved for later if needed. */
1832 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1834 for (i=0; i < MAX_SERVERS; i++) {
1835 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1839 if( i >= MAX_SERVERS) {
1840 /* Ops, no matching server found?! */
1842 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1846 /* Read result from pipe */
1847 len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1851 assert((len % sizeof(ng_ipaddr_t)) == 0);
1853 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1855 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
1856 if (len > sizeof(ng_ipaddr_t)) {
1857 /* more than one address for this hostname, remember them
1858 * in case first address is unreachable/not available */
1859 len -= sizeof(ng_ipaddr_t);
1860 if (len > sizeof(Conf_Server[i].dst_addr)) {
1861 len = sizeof(Conf_Server[i].dst_addr);
1863 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1865 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1868 New_Server(i, dest_addrs);
1869 } /* cb_Read_Forward_Lookup */
1873 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1875 /* Read result of resolver sub-process from pipe and update the
1876 * apropriate connection/client structure(s): hostname and/or
1877 * IDENT user name.*/
1884 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1886 char readbuf[HOST_LEN + 1];
1889 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
1891 /* Search associated connection ... */
1892 for( i = 0; i < Pool_Size; i++ ) {
1893 if(( My_Connections[i].sock != NONE )
1894 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
1897 if( i >= Pool_Size ) {
1898 /* Ops, none found? Probably the connection has already
1899 * been closed!? We'll ignore that ... */
1901 LogDebug("Resolver: Got callback for unknown connection!?");
1905 /* Read result from pipe */
1906 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
1910 readbuf[len] = '\0';
1911 identptr = strchr(readbuf, '\n');
1912 assert(identptr != NULL);
1914 Log( LOG_CRIT, "Resolver: Got malformed result!");
1919 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
1920 /* Okay, we got a complete result: this is a host name for outgoing
1921 * connections and a host name and IDENT user name (if enabled) for
1922 * incoming connections.*/
1923 assert ( My_Connections[i].sock >= 0 );
1924 /* Incoming connection. Search client ... */
1925 c = Conn_GetClient( i );
1926 assert( c != NULL );
1928 /* Only update client information of unregistered clients */
1929 if( Client_Type( c ) == CLIENT_UNKNOWN ) {
1930 strlcpy(My_Connections[i].host, readbuf, sizeof( My_Connections[i].host));
1931 Client_SetHostname( c, readbuf);
1935 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
1936 Client_SetUser(c, identptr, true);
1938 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
1943 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
1945 /* Reset penalty time */
1946 Conn_ResetPenalty( i );
1947 } /* cb_Read_Resolver_Result */
1951 Simple_Message( int Sock, const char *Msg )
1953 char buf[COMMAND_LEN];
1955 /* Write "simple" message to socket, without using compression
1956 * or even the connection write buffers. Used e.g. for error
1957 * messages by New_Connection(). */
1958 assert( Sock > NONE );
1959 assert( Msg != NULL );
1961 strlcpy( buf, Msg, sizeof buf - 2);
1962 len = strlcat( buf, "\r\n", sizeof buf);
1963 (void)write(Sock, buf, len);
1964 } /* Simple_Error */
1968 Conn_GetClient( CONN_ID Idx )
1970 /* return Client-Structure that belongs to the local Connection Idx.
1971 * If none is found, return NULL.
1976 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
1980 return c ? c->client : NULL;
1984 /* we cannot access My_Connections in irc-info.c */
1986 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
1990 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
1991 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
1996 Conn_UsesSSL(CONN_ID Idx)
2000 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2001 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);