2 * ngIRCd -- The Next Generation IRC Daemon
3 * Copyright (c)2001-2010 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 # ifdef HAVE_NETINET_IN_SYSTM_H
41 # include <netinet/in_systm.h>
43 # include <netinet/ip.h>
47 # include <stdint.h> /* e.g. for Mac OS X */
51 # include <tcpd.h> /* for TCP Wrappers */
67 #include "conn-func.h"
73 # include "rendezvous.h"
79 #define SERVER_WAIT (NONE - 1)
81 #define MAX_COMMANDS 3
82 #define MAX_COMMANDS_SERVER 10
85 static bool Handle_Write PARAMS(( CONN_ID Idx ));
86 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
87 static int New_Connection PARAMS(( int Sock ));
88 static CONN_ID Socket2Index PARAMS(( int Sock ));
89 static void Read_Request PARAMS(( CONN_ID Idx ));
90 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
91 static void Check_Connections PARAMS(( void ));
92 static void Check_Servers PARAMS(( void ));
93 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
94 static bool Init_Socket PARAMS(( int Sock ));
95 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
96 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
97 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
98 static void Account_Connection PARAMS((void));
101 static array My_Listeners;
102 static array My_ConnArray;
103 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
106 int allow_severity = LOG_INFO;
107 int deny_severity = LOG_ERR;
110 static void server_login PARAMS((CONN_ID idx));
113 extern struct SSLOptions Conf_SSLOptions;
114 static void cb_connserver_login_ssl PARAMS((int sock, short what));
115 static void cb_clientserver_ssl PARAMS((int sock, short what));
117 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
118 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
119 static void cb_clientserver PARAMS((int sock, short what));
123 * IO callback for listening sockets: handle new connections. This callback
124 * gets called when a new non-SSL connection should be accepted.
125 * @param sock Socket descriptor
126 * @param irrelevant (ignored IO specification)
129 cb_listen(int sock, short irrelevant)
132 (void) New_Connection(sock);
138 * IO callback for listening SSL sockets: handle new connections. This callback
139 * gets called when a new SSL-enabled connection should be accepted.
140 * @param sock Socket descriptor
141 * @param irrelevant (ignored IO specification)
144 cb_listen_ssl(int sock, short irrelevant)
149 fd = New_Connection(sock);
152 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
158 * IO callback for new outgoing non-SSL server connections.
159 * @param sock Socket descriptor
160 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
163 cb_connserver(int sock, UNUSED short what)
165 int res, err, server;
167 CONN_ID idx = Socket2Index( sock );
170 LogDebug("cb_connserver wants to write on unknown socket?!");
175 assert(what & IO_WANTWRITE);
177 /* Make sure that the server is still configured; it could have been
178 * removed in the meantime! */
179 server = Conf_GetServer(idx);
181 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
182 sock, My_Connections[idx].host);
183 Conn_Close(idx, "Connection aborted!", NULL, false);
187 /* connect() finished, get result. */
188 sock_len = (socklen_t)sizeof(err);
189 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
191 assert(sock_len == sizeof(err));
193 /* Error while connecting? */
194 if ((res != 0) || (err != 0)) {
196 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
197 idx, strerror(errno));
200 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
201 My_Connections[idx].host, Conf_Server[server].port,
204 Conn_Close(idx, "Can't connect!", NULL, false);
206 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
207 /* more addresses to try... */
208 New_Server(res, &Conf_Server[server].dst_addr[0]);
209 /* connection to dst_addr[0] is now in progress, so
210 * remove this address... */
211 Conf_Server[server].dst_addr[0] =
212 Conf_Server[server].dst_addr[1];
213 memset(&Conf_Server[server].dst_addr[1], 0,
214 sizeof(Conf_Server[server].dst_addr[1]));
219 /* connect() succeeded, remove all additional addresses */
220 memset(&Conf_Server[server].dst_addr, 0,
221 sizeof(Conf_Server[server].dst_addr));
223 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
225 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
226 io_event_setcb( sock, cb_connserver_login_ssl );
227 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
236 * Login to a remote server.
237 * @param idx Connection index
240 server_login(CONN_ID idx)
242 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
243 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
245 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
246 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
248 /* Send PASS and SERVER command to peer */
249 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
250 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
256 * IO callback for new outgoing SSL-enabled server connections.
257 * @param sock Socket descriptor
258 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
261 cb_connserver_login_ssl(int sock, short unused)
263 CONN_ID idx = Socket2Index(sock);
271 switch (ConnSSL_Connect( &My_Connections[idx])) {
273 case 0: LogDebug("ConnSSL_Connect: not ready");
276 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
277 Conn_Close(idx, "Can't connect!", NULL, false);
281 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
282 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
290 * IO callback for established non-SSL client and server connections.
291 * @param sock Socket descriptor
292 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
295 cb_clientserver(int sock, short what)
297 CONN_ID idx = Socket2Index(sock);
306 if (what & IO_WANTREAD
307 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
308 /* if TLS layer needs to write additional data, call
309 * Read_Request() instead so that SSL/TLS can continue */
313 if (what & IO_WANTREAD)
316 if (what & IO_WANTWRITE)
323 * IO callback for established SSL-enabled client and server connections.
324 * @param sock Socket descriptor
325 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
328 cb_clientserver_ssl(int sock, short what)
330 CONN_ID idx = Socket2Index(sock);
339 switch (ConnSSL_Accept(&My_Connections[idx])) {
343 return; /* EAGAIN: callback will be invoked again by IO layer */
345 Conn_Close(idx, "Socket closed!", "SSL accept error", false);
348 if (what & IO_WANTREAD)
351 if (what & IO_WANTWRITE)
354 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
360 * Initialite connecion module.
367 /* Speicher fuer Verbindungs-Pool anfordern */
368 Pool_Size = CONNECTION_POOL;
369 if ((Conf_MaxConnections > 0) &&
370 (Pool_Size > Conf_MaxConnections))
371 Pool_Size = Conf_MaxConnections;
373 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
374 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
378 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
379 * code; remove them! */
380 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
382 LogDebug("Allocated connection pool for %d items (%ld bytes).",
383 array_length(&My_ConnArray, sizeof(CONNECTION)),
384 array_bytes(&My_ConnArray));
386 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
388 array_free( &My_Listeners );
390 for (i = 0; i < Pool_Size; i++)
393 /* Initialize global counters (required after RESTART command!) */
394 NumConnections = NumConnectionsMax = NumConnectionsAccepted = 0;
400 * Clean up connection module.
407 Conn_ExitListeners();
409 LogDebug("Shutting down all connections ..." );
410 for( idx = 0; idx < Pool_Size; idx++ ) {
411 if( My_Connections[idx].sock > NONE ) {
412 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
413 "Server going down (restarting)":"Server going down", true );
417 array_free(&My_ConnArray);
418 My_Connections = NULL;
420 io_library_shutdown();
425 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
427 unsigned int created = 0;
432 len = array_length(a, sizeof (UINT16));
433 port = array_start(a);
435 fd = NewListener(listen_addr, *port);
440 if (!io_event_create( fd, IO_WANTREAD, func )) {
441 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
442 fd, (unsigned int) *port, strerror(errno));
455 * Initialize all listening sockets.
456 * @return Number of created listening sockets
459 Conn_InitListeners( void )
461 /* Initialize ports on which the server should accept connections */
462 unsigned int created = 0;
463 char *copy, *listen_addr;
465 if (!io_library_init(CONNECTION_POOL)) {
466 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
470 assert(Conf_ListenAddress);
472 /* can't use Conf_ListenAddress directly, see below */
473 copy = strdup(Conf_ListenAddress);
475 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
478 listen_addr = strtok(copy, ",");
480 while (listen_addr) {
481 ngt_TrimStr(listen_addr);
483 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
485 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
489 listen_addr = strtok(NULL, ",");
492 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
493 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
494 * Instead, free() takes place in conf.c, before the config file
495 * is being parsed. */
499 } /* Conn_InitListeners */
503 Conn_ExitListeners( void )
505 /* Close down all listening sockets */
509 Rendezvous_UnregisterListeners( );
512 arraylen = array_length(&My_Listeners, sizeof (int));
514 "Shutting down all listening sockets (%d total) ...", arraylen);
515 fd = array_start(&My_Listeners);
520 LogDebug("Listening socket %d closed.", *fd );
523 array_free(&My_Listeners);
524 } /* Conn_ExitListeners */
528 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
532 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
534 assert(listen_addrstr);
535 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
536 listen_addrstr, Port, listen_addrstr);
543 set_v6_only(int af, int sock)
545 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
551 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
552 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
560 /* return new listening port file descriptor or -1 on failure */
562 NewListener(const char *listen_addr, UINT16 Port)
564 /* Create new listening socket on specified port */
568 char name[CLIENT_ID_LEN], *info;
570 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
573 af = ng_ipaddr_af(&addr);
574 sock = socket(af, SOCK_STREAM, 0);
576 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
580 set_v6_only(af, sock);
582 if (!Init_Socket(sock))
585 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
586 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
587 ng_ipaddr_tostr(&addr), Port, strerror(errno));
592 if( listen( sock, 10 ) != 0 ) {
593 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
598 /* keep fd in list so we can close it when ngircd restarts/shuts down */
599 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
600 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
605 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
608 /* Get best server description text */
609 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
612 /* Use server info string */
614 if( Conf_ServerInfo[0] == '[' )
616 /* Cut off leading hostname part in "[]" */
617 info = strchr( Conf_ServerInfo, ']' );
621 while( *info == ' ' ) info++;
624 if( ! info ) info = Conf_ServerInfo;
627 /* Add port number to description if non-standard */
629 snprintf(name, sizeof name, "%s (port %u)", info,
632 strlcpy(name, info, sizeof name);
634 /* Register service */
635 Rendezvous_Register( name, MDNS_TYPE, Port );
643 * SSL/TLS connections require extra treatment:
644 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
645 * need to take care of that first, before checking read/write buffers.
646 * For instance, while we might have data in our write buffer, the
647 * TLS/SSL protocol might need to read internal data first for TLS/SSL
650 * If this function returns true, such a condition is met and we have
651 * to reverse the condition (check for read even if we've data to write,
652 * do not check for read but writeability even if write-buffer is empty).
655 SSL_WantRead(const CONNECTION *c)
657 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
658 io_event_add(c->sock, IO_WANTREAD);
664 SSL_WantWrite(const CONNECTION *c)
666 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
667 io_event_add(c->sock, IO_WANTWRITE);
674 SSL_WantRead(UNUSED const CONNECTION *c) { return false; }
676 SSL_WantWrite(UNUSED const CONNECTION *c) { return false; }
681 * "Main Loop": Loop until shutdown or restart is signalled.
682 * This function loops until a shutdown or restart of ngIRCd is signalled and
683 * calls io_dispatch() to check for readable and writable sockets every second.
684 * It checks for status changes on pending connections (e. g. when a hostname
685 * has been resolved), checks for "penalties" and timeouts, and handles the
692 unsigned int wdatalen, bytes_processed;
696 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
700 Rendezvous_Handler();
703 /* Should the configuration be reloaded? */
704 if (NGIRCd_SignalRehash)
707 /* Check configured servers and established links */
711 /* Look for non-empty read buffers ... */
712 for (i = 0; i < Pool_Size; i++) {
713 if ((My_Connections[i].sock > NONE)
714 && (array_bytes(&My_Connections[i].rbuf) > 0)
715 && (My_Connections[i].delaytime <= t)) {
716 /* ... and try to handle the received data */
717 bytes_processed = Handle_Buffer(i);
718 /* if we processed data, and there might be
719 * more commands in the input buffer, do not
720 * try to read any more data now */
721 if (bytes_processed &&
722 array_bytes(&My_Connections[i].rbuf) > 2) {
724 ("Throttling connection %d: command limit reached!",
726 Conn_SetPenalty(i, 1);
731 /* Look for non-empty write buffers ... */
732 for (i = 0; i < Pool_Size; i++) {
733 if (My_Connections[i].sock <= NONE)
736 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
739 array_bytes(&My_Connections[i].zip.wbuf) > 0)
744 if (SSL_WantRead(&My_Connections[i]))
746 io_event_add(My_Connections[i].sock,
751 /* Check from which sockets we possibly could read ... */
752 for (i = 0; i < Pool_Size; i++) {
753 if (My_Connections[i].sock <= NONE)
756 if (SSL_WantWrite(&My_Connections[i]))
757 continue; /* TLS/SSL layer needs to write data; deal with this first */
759 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
760 /* Wait for completion of resolver sub-process ... */
761 io_event_del(My_Connections[i].sock,
766 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
767 /* Wait for completion of connect() ... */
770 if (My_Connections[i].delaytime > t) {
771 /* There is a "penalty time" set: ignore socket! */
772 io_event_del(My_Connections[i].sock,
776 io_event_add(My_Connections[i].sock, IO_WANTREAD);
779 /* Set the timeout for reading from the network to 1 second,
780 * which is the granularity with witch we handle "penalty
781 * times" for example.
782 * Note: tv_sec/usec are undefined(!) after io_dispatch()
783 * returns, so we have to set it beforce each call to it! */
787 /* Wait for activity ... */
788 i = io_dispatch(&tv);
789 if (i == -1 && errno != EINTR) {
790 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
792 Log(LOG_ALERT, "%s exiting due to fatal errors!",
798 if (NGIRCd_SignalQuit)
799 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
800 else if (NGIRCd_SignalRestart)
801 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
806 * Write a text string into the socket of a connection.
807 * This function automatically appends CR+LF to the string and validates that
808 * the result is a valid IRC message (oversized messages are shortened, for
809 * example). Then it calls the Conn_Write() function to do the actual sending.
810 * @param Idx Index fo the connection.
811 * @param Format Format string, see printf().
812 * @return true on success, false otherwise.
816 Conn_WriteStr( CONN_ID Idx, char *Format, ... )
819 Conn_WriteStr( Idx, Format, va_alist )
825 char buffer[COMMAND_LEN];
830 assert( Idx > NONE );
831 assert( Format != NULL );
834 va_start( ap, Format );
838 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
840 * The string that should be written to the socket is longer
841 * than the allowed size of COMMAND_LEN bytes (including both
842 * the CR and LF characters). This can be caused by the
843 * IRC_WriteXXX() functions when the prefix of this server had
844 * to be added to an already "quite long" command line which
845 * has been received from a regular IRC client, for example.
847 * We are not allowed to send such "oversized" messages to
848 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
849 * ("these messages SHALL NOT exceed 512 characters in length,
850 * counting all characters including the trailing CR-LF").
852 * So we have a big problem here: we should send more bytes
853 * to the network than we are allowed to and we don't know
854 * the originator (any more). The "old" behaviour of blaming
855 * the receiver ("next hop") is a bad idea (it could be just
856 * an other server only routing the message!), so the only
857 * option left is to shorten the string and to hope that the
858 * result is still somewhat useful ...
862 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
868 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
871 len = strlcat( buffer, "\r\n", sizeof( buffer ));
872 ok = Conn_Write(Idx, buffer, len);
873 My_Connections[Idx].msg_out++;
877 } /* Conn_WriteStr */
881 * Append Data to the outbound write buffer of a connection.
882 * @param Idx Index of the connection.
883 * @param Data pointer to the data.
884 * @param Len length of Data.
885 * @return true on success, false otherwise.
888 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
891 size_t writebuf_limit = WRITEBUFFER_LEN;
892 assert( Idx > NONE );
893 assert( Data != NULL );
896 c = Conn_GetClient(Idx);
899 /* Servers do get special write buffer limits, so they can generate
900 * all the messages that are required while peering. */
901 if (Client_Type(c) == CLIENT_SERVER)
902 writebuf_limit = WRITEBUFFER_SLINK_LEN;
904 /* Is the socket still open? A previous call to Conn_Write()
905 * may have closed the connection due to a fatal error.
906 * In this case it is sufficient to return an error, as well. */
907 if( My_Connections[Idx].sock <= NONE ) {
908 LogDebug("Skipped write on closed socket (connection %d).", Idx);
913 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
915 * Zip_Buffer() does all the dirty work for us: it flushes
916 * the (pre-)compression buffers if required and handles
917 * all error conditions. */
918 if (!Zip_Buffer(Idx, Data, Len))
924 /* Uncompressed link:
925 * Check if outbound buffer has enough space for the data. */
926 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
928 /* Buffer is full, flush it. Handle_Write deals with
929 * low-level errors, if any. */
930 if (!Handle_Write(Idx))
934 /* When the write buffer is still too big after flushing it,
935 * the connection will be killed. */
936 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
939 "Write buffer overflow (connection %d, size %lu byte)!",
941 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
942 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
946 /* Copy data to write buffer */
947 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
950 My_Connections[Idx].bytes_out += Len;
953 /* Adjust global write counter */
961 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
963 /* Close connection. Open pipes of asyncronous resolver
964 * sub-processes are closed down. */
970 double in_z_k, out_z_k;
974 assert( Idx > NONE );
976 /* Is this link already shutting down? */
977 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
978 /* Conn_Close() has been called recursively for this link;
979 * probabe reason: Handle_Write() failed -- see below. */
980 LogDebug("Recursive request to close connection: %d", Idx );
984 assert( My_Connections[Idx].sock > NONE );
986 /* Mark link as "closing" */
987 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
989 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
990 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
991 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
993 /* Search client, if any */
994 c = Conn_GetClient( Idx );
996 /* Should the client be informed? */
999 /* Send statistics to client if registered as user: */
1000 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1002 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1003 Client_ID(Client_ThisServer()), Client_ID(c),
1005 (double)My_Connections[Idx].bytes_in / 1024,
1006 (double)My_Connections[Idx].bytes_out / 1024);
1009 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1011 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1013 Conn_WriteStr(Idx, "ERROR :Closing connection.");
1016 /* Try to write out the write buffer. Note: Handle_Write() eventually
1017 * removes the CLIENT structure associated with this connection if an
1018 * error occurs! So we have to re-check if there is still an valid
1019 * CLIENT structure after calling Handle_Write() ...*/
1020 (void)Handle_Write( Idx );
1022 /* Search client, if any (re-check!) */
1023 c = Conn_GetClient( Idx );
1025 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1026 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1027 ConnSSL_Free(&My_Connections[Idx]);
1030 /* Shut down socket */
1031 if (! io_close(My_Connections[Idx].sock)) {
1032 /* Oops, we can't close the socket!? This is ... ugly! */
1034 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1035 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1036 port, strerror(errno));
1039 /* Mark socket as invalid: */
1040 My_Connections[Idx].sock = NONE;
1042 /* If there is still a client, unregister it now */
1044 Client_Destroy(c, LogMsg, FwdMsg, true);
1046 /* Calculate statistics and log information */
1047 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1048 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1050 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1051 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1052 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1053 /* Make sure that no division by zero can occur during
1054 * the calculation of in_p and out_p: in_z_k and out_z_k
1055 * are non-zero, that's guaranteed by the protocol until
1056 * compression can be enabled. */
1061 in_p = (int)(( in_k * 100 ) / in_z_k );
1062 out_p = (int)(( out_k * 100 ) / out_z_k );
1064 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1065 Idx, My_Connections[Idx].host, port,
1066 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1072 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1073 Idx, My_Connections[Idx].host, port,
1077 /* cancel running resolver */
1078 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
1079 Resolve_Shutdown(&My_Connections[Idx].res_stat);
1081 /* Servers: Modify time of next connect attempt? */
1082 Conf_UnsetServer( Idx );
1085 /* Clean up zlib, if link was compressed */
1086 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1087 inflateEnd( &My_Connections[Idx].zip.in );
1088 deflateEnd( &My_Connections[Idx].zip.out );
1089 array_free(&My_Connections[Idx].zip.rbuf);
1090 array_free(&My_Connections[Idx].zip.wbuf);
1094 array_free(&My_Connections[Idx].rbuf);
1095 array_free(&My_Connections[Idx].wbuf);
1097 /* Clean up connection structure (=free it) */
1098 Init_Conn_Struct( Idx );
1100 assert(NumConnections > 0);
1103 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1104 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1111 return NumConnections;
1118 return NumConnectionsMax;
1119 } /* Conn_CountMax */
1123 Conn_CountAccepted(void)
1125 return NumConnectionsAccepted;
1126 } /* Conn_CountAccepted */
1130 Conn_SyncServerStruct( void )
1132 /* Synchronize server structures (connection IDs):
1133 * connections <-> configuration */
1139 for( i = 0; i < Pool_Size; i++ ) {
1140 /* Established connection? */
1141 if (My_Connections[i].sock < 0)
1144 /* Server connection? */
1145 client = Conn_GetClient( i );
1146 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
1148 for( c = 0; c < MAX_SERVERS; c++ )
1150 /* Configured server? */
1151 if( ! Conf_Server[c].host[0] ) continue;
1154 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
1155 Conf_Server[c].conn_id = i;
1158 } /* SyncServerStruct */
1162 * Send out data of write buffer; connect new sockets.
1165 Handle_Write( CONN_ID Idx )
1170 assert( Idx > NONE );
1171 if ( My_Connections[Idx].sock < 0 ) {
1172 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1175 assert( My_Connections[Idx].sock > NONE );
1177 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1180 if (wdatalen == 0) {
1181 /* Write buffer is empty, so we try to flush the compression
1182 * buffer and get some data to work with from there :-) */
1183 if (!Zip_Flush(Idx))
1186 /* Now the write buffer most probably has changed: */
1187 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1191 if (wdatalen == 0) {
1192 /* Still no data, fine. */
1193 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1198 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1202 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1203 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1207 len = write(My_Connections[Idx].sock,
1208 array_start(&My_Connections[Idx].wbuf), wdatalen );
1211 if (errno == EAGAIN || errno == EINTR)
1214 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1215 Idx, My_Connections[Idx].sock, strerror(errno));
1216 Conn_Close(Idx, "Write error!", NULL, false);
1220 /* move any data not yet written to beginning */
1221 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1224 } /* Handle_Write */
1228 Count_Connections(ng_ipaddr_t *a)
1233 for (i = 0; i < Pool_Size; i++) {
1234 if (My_Connections[i].sock <= NONE)
1236 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1240 } /* Count_Connections */
1244 * Initialize new client connection on a listening socket.
1245 * @param Sock Listening socket descriptor
1246 * @return Accepted socket descriptor or -1 on error
1249 New_Connection(int Sock)
1252 struct request_info req;
1254 ng_ipaddr_t new_addr;
1255 char ip_str[NG_INET_ADDRSTRLEN];
1256 int new_sock, new_sock_len, identsock;
1260 assert(Sock > NONE);
1262 new_sock_len = (int)sizeof(new_addr);
1263 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1264 (socklen_t *)&new_sock_len);
1266 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1269 NumConnectionsAccepted++;
1271 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1272 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1273 Simple_Message(new_sock, "ERROR :Internal Server Error");
1279 /* Validate socket using TCP Wrappers */
1280 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1281 RQ_CLIENT_SIN, &new_addr, NULL);
1283 if (!hosts_access(&req)) {
1285 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1286 Simple_Message(new_sock, "ERROR :Connection refused");
1292 if (!Init_Socket(new_sock))
1295 /* Check global connection limit */
1296 if ((Conf_MaxConnections > 0) &&
1297 (NumConnections >= (size_t) Conf_MaxConnections)) {
1298 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1299 Conf_MaxConnections);
1300 Simple_Message(new_sock, "ERROR :Connection limit reached");
1305 /* Check IP-based connection limit */
1306 cnt = Count_Connections(&new_addr);
1307 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1308 /* Access denied, too many connections from this IP address! */
1310 "Refused connection from %s: too may connections (%ld) from this IP address!",
1312 Simple_Message(new_sock,
1313 "ERROR :Connection refused, too many connections from your IP address!");
1318 if (new_sock >= Pool_Size) {
1319 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1320 (size_t) new_sock)) {
1322 "Can't allocate memory! [New_Connection]");
1323 Simple_Message(new_sock, "ERROR: Internal error");
1327 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1328 new_sock, array_length(&My_ConnArray,
1329 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1331 /* Adjust pointer to new block */
1332 My_Connections = array_start(&My_ConnArray);
1333 while (Pool_Size <= new_sock)
1334 Init_Conn_Struct(Pool_Size++);
1337 /* register callback */
1338 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1340 "Can't accept connection: io_event_create failed!");
1341 Simple_Message(new_sock, "ERROR :Internal error");
1346 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1349 "Can't accept connection: can't create client structure!");
1350 Simple_Message(new_sock, "ERROR :Internal error");
1355 Init_Conn_Struct(new_sock);
1356 My_Connections[new_sock].sock = new_sock;
1357 My_Connections[new_sock].addr = new_addr;
1358 My_Connections[new_sock].client = c;
1360 /* Set initial hostname to IP address. This becomes overwritten when
1361 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1362 if (ng_ipaddr_af(&new_addr) != AF_INET)
1363 snprintf(My_Connections[new_sock].host,
1364 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1366 strlcpy(My_Connections[new_sock].host, ip_str,
1367 sizeof(My_Connections[new_sock].host));
1369 Client_SetHostname(c, My_Connections[new_sock].host);
1371 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1372 new_sock, My_Connections[new_sock].host,
1373 ng_ipaddr_getport(&new_addr), Sock);
1375 identsock = new_sock;
1381 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1382 identsock, cb_Read_Resolver_Result);
1384 /* ngIRCd waits up to 4 seconds for the result of the asynchronous
1385 * DNS and IDENT resolver subprocess using the "penalty" mechanism.
1386 * If there are results earlier, the delay is aborted. */
1387 Conn_SetPenalty(new_sock, 4);
1389 Account_Connection();
1391 } /* New_Connection */
1395 Account_Connection(void)
1398 if (NumConnections > NumConnectionsMax)
1399 NumConnectionsMax = NumConnections;
1400 LogDebug("Total number of connections now %lu (max %lu).",
1401 NumConnections, NumConnectionsMax);
1402 } /* Account_Connection */
1406 Socket2Index( int Sock )
1408 assert( Sock >= 0 );
1410 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1411 /* the Connection was already closed again, likely due to
1413 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1417 } /* Socket2Index */
1421 * Read data from the network to the read buffer. If an error occures,
1422 * the socket of this connection will be shut down.
1425 Read_Request( CONN_ID Idx )
1428 static const unsigned int maxbps = COMMAND_LEN / 2;
1429 char readbuf[READBUFFER_LEN];
1432 assert( Idx > NONE );
1433 assert( My_Connections[Idx].sock > NONE );
1436 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1437 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1439 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1442 /* Read buffer is full */
1444 "Receive buffer overflow (connection %d): %d bytes!",
1445 Idx, array_bytes(&My_Connections[Idx].rbuf));
1446 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1451 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1452 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1455 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1457 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1458 My_Connections[Idx].host,
1459 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1460 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1462 "Socket closed!", "Client closed connection",
1468 if( errno == EAGAIN ) return;
1469 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1470 Idx, My_Connections[Idx].sock, strerror(errno));
1471 Conn_Close(Idx, "Read error!", "Client closed connection",
1476 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1477 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1480 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1482 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1489 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1490 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1491 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1495 /* Update connection statistics */
1496 My_Connections[Idx].bytes_in += len;
1498 /* Update timestamp of last data received if this connection is
1499 * registered as a user, server or service connection. Don't update
1500 * otherwise, so users have at least Conf_PongTimeout seconds time to
1501 * register with the IRC server -- see Check_Connections().
1502 * Set "lastping", too, so we can handle time shifts backwards ... */
1503 c = Conn_GetClient(Idx);
1504 if (c && (Client_Type(c) == CLIENT_USER
1505 || Client_Type(c) == CLIENT_SERVER
1506 || Client_Type(c) == CLIENT_SERVICE)) {
1508 if (My_Connections[Idx].lastdata != t)
1509 My_Connections[Idx].bps = 0;
1511 My_Connections[Idx].lastdata = t;
1512 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1515 /* Look at the data in the (read-) buffer of this connection */
1516 My_Connections[Idx].bps += Handle_Buffer(Idx);
1517 if (Client_Type(c) != CLIENT_SERVER
1518 && My_Connections[Idx].bps >= maxbps) {
1519 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1520 Idx, My_Connections[Idx].bps, maxbps);
1521 Conn_SetPenalty(Idx, 1);
1523 } /* Read_Request */
1527 * Handle all data in the connection read-buffer.
1528 * Data is processed until no complete command is left in the read buffer,
1529 * or MAX_COMMANDS[_SERVER] commands were processed.
1530 * When a fatal error occurs, the connection is shut down.
1531 * @param Idx Index of the connection.
1532 * @return number of bytes processed.
1535 Handle_Buffer(CONN_ID Idx)
1538 char *ptr1, *ptr2, *first_eol;
1546 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1549 c = Conn_GetClient(Idx);
1552 /* Servers do get special command limits, so they can process
1553 * all the messages that are required while peering. */
1554 if (Client_Type(c) == CLIENT_SERVER)
1555 maxcmd = MAX_COMMANDS_SERVER;
1557 starttime = time(NULL);
1558 for (i=0; i < maxcmd; i++) {
1560 if (My_Connections[Idx].delaytime > starttime)
1563 /* Unpack compressed data, if compression is in use */
1564 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1565 /* When unzipping fails, Unzip_Buffer() shuts
1566 * down the connection itself */
1567 if (!Unzip_Buffer(Idx))
1572 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1575 /* Make sure that the buffer is NULL terminated */
1576 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1577 Conn_Close(Idx, NULL,
1578 "Can't allocate memory [Handle_Buffer]",
1583 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1584 * "IRC messages are always lines of characters terminated
1585 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1587 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1590 /* Check for non-RFC-compliant request (only CR or LF)?
1591 * Unfortunately, there are quite a few clients out there
1592 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1593 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1594 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1596 /* Check if there is a single CR or LF _before_ the
1597 * corerct CR+LF line terminator: */
1598 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1599 if (first_eol < ptr) {
1600 /* Single CR or LF before CR+LF found */
1604 } else if (ptr1 || ptr2) {
1605 /* No CR+LF terminated command found, but single
1606 * CR or LF found ... */
1608 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1610 ptr = ptr1 ? ptr1 : ptr2;
1618 /* Complete (=line terminated) request found, handle it! */
1621 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1623 if (len > (COMMAND_LEN - 1)) {
1624 /* Request must not exceed 512 chars (incl. CR+LF!),
1625 * see RFC 2812. Disconnect Client if this happens. */
1627 "Request too long (connection %d): %d bytes (max. %d expected)!",
1628 Idx, array_bytes(&My_Connections[Idx].rbuf),
1630 Conn_Close(Idx, NULL, "Request too long", true);
1634 len_processed += (unsigned int)len;
1636 /* Request is empty (only '\r\n', '\r' or '\n');
1637 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1638 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1642 /* remember if stream is already compressed */
1643 old_z = My_Connections[Idx].options & CONN_ZIP;
1646 My_Connections[Idx].msg_in++;
1648 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1649 return 0; /* error -> connection has been closed */
1651 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1652 LogDebug("Connection %d: %d bytes left in read buffer.",
1653 Idx, array_bytes(&My_Connections[Idx].rbuf));
1655 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1656 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1657 /* The last command activated socket compression.
1658 * Data that was read after that needs to be copied
1659 * to the unzip buffer for decompression: */
1661 (&My_Connections[Idx].zip.rbuf,
1662 &My_Connections[Idx].rbuf)) {
1663 Conn_Close(Idx, NULL,
1664 "Can't allocate memory [Handle_Buffer]",
1669 array_trunc(&My_Connections[Idx].rbuf);
1671 ("Moved already received data (%u bytes) to uncompression buffer.",
1672 array_bytes(&My_Connections[Idx].zip.rbuf));
1676 return len_processed;
1677 } /* Handle_Buffer */
1681 Check_Connections(void)
1683 /* check if connections are alive. if not, play PING-PONG first.
1684 * if this doesn't help either, disconnect client. */
1689 for (i = 0; i < Pool_Size; i++) {
1690 if (My_Connections[i].sock < 0)
1693 c = Conn_GetClient(i);
1694 if (c && ((Client_Type(c) == CLIENT_USER)
1695 || (Client_Type(c) == CLIENT_SERVER)
1696 || (Client_Type(c) == CLIENT_SERVICE))) {
1697 /* connected User, Server or Service */
1698 if (My_Connections[i].lastping >
1699 My_Connections[i].lastdata) {
1700 /* We already sent a ping */
1701 if (My_Connections[i].lastping <
1702 time(NULL) - Conf_PongTimeout) {
1705 ("Connection %d: Ping timeout: %d seconds.",
1706 i, Conf_PongTimeout);
1707 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1708 Conn_Close(i, NULL, msg, true);
1710 } else if (My_Connections[i].lastdata <
1711 time(NULL) - Conf_PingTimeout) {
1712 /* We need to send a PING ... */
1713 LogDebug("Connection %d: sending PING ...", i);
1714 My_Connections[i].lastping = time(NULL);
1715 Conn_WriteStr(i, "PING :%s",
1716 Client_ID(Client_ThisServer()));
1719 /* The connection is not fully established yet, so
1720 * we don't do the PING-PONG game here but instead
1721 * disconnect the client after "a short time" if it's
1722 * still not registered. */
1724 if (My_Connections[i].lastdata <
1725 time(NULL) - Conf_PongTimeout) {
1727 ("Unregistered connection %d timed out ...",
1729 Conn_Close(i, NULL, "Timeout", false);
1733 } /* Check_Connections */
1737 Check_Servers( void )
1739 /* Check if we can establish further server links */
1744 /* Check all configured servers */
1745 for( i = 0; i < MAX_SERVERS; i++ ) {
1746 /* Valid outgoing server which isn't already connected or disabled? */
1747 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1748 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1751 /* Is there already a connection in this group? */
1752 if( Conf_Server[i].group > NONE ) {
1753 for (n = 0; n < MAX_SERVERS; n++) {
1754 if (n == i) continue;
1755 if ((Conf_Server[n].conn_id != NONE) &&
1756 (Conf_Server[n].group == Conf_Server[i].group))
1759 if (n < MAX_SERVERS) continue;
1762 /* Check last connect attempt? */
1763 time_now = time(NULL);
1764 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1767 /* Okay, try to connect now */
1768 Conf_Server[i].lasttry = time_now;
1769 Conf_Server[i].conn_id = SERVER_WAIT;
1770 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1771 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1773 } /* Check_Servers */
1777 New_Server( int Server , ng_ipaddr_t *dest)
1779 /* Establish new server link */
1780 char ip_str[NG_INET_ADDRSTRLEN];
1781 int af_dest, res, new_sock;
1784 assert( Server > NONE );
1786 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1787 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1791 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1792 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1794 af_dest = ng_ipaddr_af(dest);
1795 new_sock = socket(af_dest, SOCK_STREAM, 0);
1797 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1801 if (!Init_Socket(new_sock))
1804 /* is a bind address configured? */
1805 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1806 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1807 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1808 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1810 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1811 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1813 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1814 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1815 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1816 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1821 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1823 "Cannot allocate memory for server connection (socket %d)",
1829 My_Connections = array_start(&My_ConnArray);
1831 assert(My_Connections[new_sock].sock <= 0);
1833 Init_Conn_Struct(new_sock);
1835 ng_ipaddr_tostr_r(dest, ip_str);
1836 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1838 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1843 /* Conn_Close() decrements this counter again */
1844 Account_Connection();
1845 Client_SetIntroducer( c, c );
1846 Client_SetToken( c, TOKEN_OUTBOUND );
1848 /* Register connection */
1849 Conf_Server[Server].conn_id = new_sock;
1850 My_Connections[new_sock].sock = new_sock;
1851 My_Connections[new_sock].addr = *dest;
1852 My_Connections[new_sock].client = c;
1853 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1854 sizeof(My_Connections[new_sock].host ));
1856 /* Register new socket */
1857 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1858 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1859 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1860 Init_Conn_Struct( new_sock );
1861 Conf_Server[Server].conn_id = NONE;
1864 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1865 &Conf_Server[Server] ))
1867 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1868 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1869 Init_Conn_Struct( new_sock );
1870 Conf_Server[Server].conn_id = NONE;
1874 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1875 new_sock, My_Connections[new_sock].sock, NumConnections);
1876 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1881 * Initialize connection structure.
1884 Init_Conn_Struct(CONN_ID Idx)
1886 time_t now = time(NULL);
1888 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1889 My_Connections[Idx].sock = -1;
1890 My_Connections[Idx].signon = now;
1891 My_Connections[Idx].lastdata = now;
1892 My_Connections[Idx].lastprivmsg = now;
1893 Resolve_Init(&My_Connections[Idx].res_stat);
1894 } /* Init_Conn_Struct */
1898 Init_Socket( int Sock )
1900 /* Initialize socket (set options) */
1904 if (!io_setnonblock(Sock)) {
1905 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1910 /* Don't block this port after socket shutdown */
1912 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1914 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1915 /* ignore this error */
1918 /* Set type of service (TOS) */
1919 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
1920 value = IPTOS_LOWDELAY;
1921 LogDebug("Setting IP_TOS on socket %d to IPTOS_LOWDELAY.", Sock);
1922 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
1923 (socklen_t) sizeof(value))) {
1924 Log(LOG_ERR, "Can't set socket option IP_TOS: %s!",
1926 /* ignore this error */
1935 cb_Connect_to_Server(int fd, UNUSED short events)
1937 /* Read result of resolver sub-process from pipe and start connection */
1940 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1941 four so we can log the 'more than we can handle'
1942 condition. First result is tried immediately, rest
1943 is saved for later if needed. */
1945 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1947 for (i=0; i < MAX_SERVERS; i++) {
1948 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1952 if( i >= MAX_SERVERS) {
1953 /* Ops, no matching server found?! */
1955 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1959 /* Read result from pipe */
1960 len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1964 assert((len % sizeof(ng_ipaddr_t)) == 0);
1966 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1968 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
1969 if (len > sizeof(ng_ipaddr_t)) {
1970 /* more than one address for this hostname, remember them
1971 * in case first address is unreachable/not available */
1972 len -= sizeof(ng_ipaddr_t);
1973 if (len > sizeof(Conf_Server[i].dst_addr)) {
1974 len = sizeof(Conf_Server[i].dst_addr);
1976 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1978 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1981 New_Server(i, dest_addrs);
1982 } /* cb_Read_Forward_Lookup */
1986 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1988 /* Read result of resolver sub-process from pipe and update the
1989 * apropriate connection/client structure(s): hostname and/or
1990 * IDENT user name.*/
1997 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1999 char readbuf[HOST_LEN + 1];
2002 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2004 /* Search associated connection ... */
2005 for( i = 0; i < Pool_Size; i++ ) {
2006 if(( My_Connections[i].sock != NONE )
2007 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
2010 if( i >= Pool_Size ) {
2011 /* Ops, none found? Probably the connection has already
2012 * been closed!? We'll ignore that ... */
2014 LogDebug("Resolver: Got callback for unknown connection!?");
2018 /* Read result from pipe */
2019 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
2023 readbuf[len] = '\0';
2024 identptr = strchr(readbuf, '\n');
2025 assert(identptr != NULL);
2027 Log( LOG_CRIT, "Resolver: Got malformed result!");
2032 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2033 /* Okay, we got a complete result: this is a host name for outgoing
2034 * connections and a host name and IDENT user name (if enabled) for
2035 * incoming connections.*/
2036 assert ( My_Connections[i].sock >= 0 );
2037 /* Incoming connection. Search client ... */
2038 c = Conn_GetClient( i );
2039 assert( c != NULL );
2041 /* Only update client information of unregistered clients.
2042 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2043 * the resolver results, so we don't have to worry to override settings
2044 * from these commands here. */
2045 if(Client_Type(c) == CLIENT_UNKNOWN) {
2046 strlcpy(My_Connections[i].host, readbuf,
2047 sizeof(My_Connections[i].host));
2048 Client_SetHostname(c, readbuf);
2052 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
2053 Client_SetUser(c, identptr, true);
2055 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2060 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2062 /* Reset penalty time */
2063 Conn_ResetPenalty( i );
2064 } /* cb_Read_Resolver_Result */
2068 * Write a "simple" (error) message to a socket.
2069 * The message is sent without using the connection write buffers, without
2070 * compression/encryption, and even without any error reporting. It is
2071 * designed for error messages of e.g. New_Connection(). */
2073 Simple_Message(int Sock, const char *Msg)
2075 char buf[COMMAND_LEN];
2078 assert(Sock > NONE);
2079 assert(Msg != NULL);
2081 strlcpy(buf, Msg, sizeof buf - 2);
2082 len = strlcat(buf, "\r\n", sizeof buf);
2083 if (write(Sock, buf, len) < 0) {
2084 /* Because this function most probably got called to log
2085 * an error message, any write error is ignored here to
2086 * avoid an endless loop. But casting the result of write()
2087 * to "void" doesn't satisfy the GNU C code attribute
2088 * "warn_unused_result" which is used by some versions of
2089 * glibc (e.g. 2.11.1), therefore this silly error
2090 * "handling" code here :-( */
2093 } /* Simple_Error */
2097 * Get CLIENT structure that belongs to a local connection identified by its
2098 * index number. Each connection belongs to a client by definition, so it is
2099 * not required that the caller checks for NULL return values.
2100 * @param Idx Connection index number
2101 * @return Pointer to CLIENT structure
2104 Conn_GetClient( CONN_ID Idx )
2109 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2111 return c ? c->client : NULL;
2118 * Get information about used SSL chiper.
2119 * @param Idx Connection index number
2120 * @param buf Buffer for returned information text
2121 * @param len Size of return buffer "buf"
2122 * @return true on success, false otherwise
2125 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2129 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2130 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2135 * Check if a connection is SSL-enabled or not.
2136 * @param Idx Connection index number
2137 * @return true if connection is SSL-enabled, false otherwise.
2140 Conn_UsesSSL(CONN_ID Idx)
2144 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2145 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);