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, "SSL accept error, closing socket", "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++)
396 * Clean up connection module.
403 Conn_ExitListeners();
405 LogDebug("Shutting down all connections ..." );
406 for( idx = 0; idx < Pool_Size; idx++ ) {
407 if( My_Connections[idx].sock > NONE ) {
408 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
409 "Server going down (restarting)":"Server going down", true );
413 array_free(&My_ConnArray);
414 My_Connections = NULL;
416 io_library_shutdown();
421 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
423 unsigned int created = 0;
428 len = array_length(a, sizeof (UINT16));
429 port = array_start(a);
431 fd = NewListener(listen_addr, *port);
436 if (!io_event_create( fd, IO_WANTREAD, func )) {
437 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
438 fd, (unsigned int) *port, strerror(errno));
451 * Initialize all listening sockets.
452 * @return Number of created listening sockets
455 Conn_InitListeners( void )
457 /* Initialize ports on which the server should accept connections */
458 unsigned int created = 0;
459 char *copy, *listen_addr;
461 if (!io_library_init(CONNECTION_POOL)) {
462 Log(LOG_EMERG, "Cannot initialize IO routines: %s", strerror(errno));
466 assert(Conf_ListenAddress);
468 /* can't use Conf_ListenAddress directly, see below */
469 copy = strdup(Conf_ListenAddress);
471 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
474 listen_addr = strtok(copy, ",");
476 while (listen_addr) {
477 ngt_TrimStr(listen_addr);
479 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
481 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
485 listen_addr = strtok(NULL, ",");
488 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
489 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
490 * Instead, free() takes place in conf.c, before the config file
491 * is being parsed. */
495 } /* Conn_InitListeners */
499 Conn_ExitListeners( void )
501 /* Close down all listening sockets */
505 Rendezvous_UnregisterListeners( );
508 arraylen = array_length(&My_Listeners, sizeof (int));
510 "Shutting down all listening sockets (%d total) ...", arraylen);
511 fd = array_start(&My_Listeners);
516 LogDebug("Listening socket %d closed.", *fd );
519 array_free(&My_Listeners);
520 } /* Conn_ExitListeners */
524 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
528 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
530 assert(listen_addrstr);
531 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
532 listen_addrstr, Port, listen_addrstr);
539 set_v6_only(int af, int sock)
541 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
547 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
548 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
556 /* return new listening port file descriptor or -1 on failure */
558 NewListener(const char *listen_addr, UINT16 Port)
560 /* Create new listening socket on specified port */
564 char name[CLIENT_ID_LEN], *info;
566 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
569 af = ng_ipaddr_af(&addr);
570 sock = socket(af, SOCK_STREAM, 0);
572 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
576 set_v6_only(af, sock);
578 if (!Init_Socket(sock))
581 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
582 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
583 ng_ipaddr_tostr(&addr), Port, strerror(errno));
588 if( listen( sock, 10 ) != 0 ) {
589 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
594 /* keep fd in list so we can close it when ngircd restarts/shuts down */
595 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
596 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
601 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
604 /* Get best server description text */
605 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
608 /* Use server info string */
610 if( Conf_ServerInfo[0] == '[' )
612 /* Cut off leading hostname part in "[]" */
613 info = strchr( Conf_ServerInfo, ']' );
617 while( *info == ' ' ) info++;
620 if( ! info ) info = Conf_ServerInfo;
623 /* Add port number to description if non-standard */
625 snprintf(name, sizeof name, "%s (port %u)", info,
628 strlcpy(name, info, sizeof name);
630 /* Register service */
631 Rendezvous_Register( name, MDNS_TYPE, Port );
639 * SSL/TLS connections require extra treatment:
640 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
641 * need to take care of that first, before checking read/write buffers.
642 * For instance, while we might have data in our write buffer, the
643 * TLS/SSL protocol might need to read internal data first for TLS/SSL
646 * If this function returns true, such a condition is met and we have
647 * to reverse the condition (check for read even if we've data to write,
648 * do not check for read but writeability even if write-buffer is empty).
651 SSL_WantRead(const CONNECTION *c)
653 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
654 io_event_add(c->sock, IO_WANTREAD);
660 SSL_WantWrite(const CONNECTION *c)
662 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
663 io_event_add(c->sock, IO_WANTWRITE);
670 SSL_WantRead(UNUSED const CONNECTION *c) { return false; }
672 SSL_WantWrite(UNUSED const CONNECTION *c) { return false; }
677 * "Main Loop": Loop until shutdown or restart is signalled.
678 * This function loops until a shutdown or restart of ngIRCd is signalled and
679 * calls io_dispatch() to check for readable and writable sockets every second.
680 * It checks for status changes on pending connections (e. g. when a hostname
681 * has been resolved), checks for "penalties" and timeouts, and handles the
688 unsigned int wdatalen, bytes_processed;
692 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
696 Rendezvous_Handler();
699 /* Should the configuration be reloaded? */
700 if (NGIRCd_SignalRehash)
703 /* Check configured servers and established links */
707 /* Look for non-empty read buffers ... */
708 for (i = 0; i < Pool_Size; i++) {
709 if ((My_Connections[i].sock > NONE)
710 && (array_bytes(&My_Connections[i].rbuf) > 0)
711 && (My_Connections[i].delaytime <= t)) {
712 /* ... and try to handle the received data */
713 bytes_processed = Handle_Buffer(i);
714 /* if we processed data, and there might be
715 * more commands in the input buffer, do not
716 * try to read any more data now */
717 if (bytes_processed &&
718 array_bytes(&My_Connections[i].rbuf) > 2) {
720 ("Throttling connection %d: command limit reached!",
722 Conn_SetPenalty(i, 1);
727 /* Look for non-empty write buffers ... */
728 for (i = 0; i < Pool_Size; i++) {
729 if (My_Connections[i].sock <= NONE)
732 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
735 array_bytes(&My_Connections[i].zip.wbuf) > 0)
740 if (SSL_WantRead(&My_Connections[i]))
742 io_event_add(My_Connections[i].sock,
747 /* Check from which sockets we possibly could read ... */
748 for (i = 0; i < Pool_Size; i++) {
749 if (My_Connections[i].sock <= NONE)
752 if (SSL_WantWrite(&My_Connections[i]))
753 continue; /* TLS/SSL layer needs to write data; deal with this first */
755 if (Resolve_INPROGRESS(&My_Connections[i].res_stat)) {
756 /* Wait for completion of resolver sub-process ... */
757 io_event_del(My_Connections[i].sock,
762 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
763 /* Wait for completion of connect() ... */
766 if (My_Connections[i].delaytime > t) {
767 /* There is a "penalty time" set: ignore socket! */
768 io_event_del(My_Connections[i].sock,
772 io_event_add(My_Connections[i].sock, IO_WANTREAD);
775 /* Set the timeout for reading from the network to 1 second,
776 * which is the granularity with witch we handle "penalty
777 * times" for example.
778 * Note: tv_sec/usec are undefined(!) after io_dispatch()
779 * returns, so we have to set it beforce each call to it! */
783 /* Wait for activity ... */
784 i = io_dispatch(&tv);
785 if (i == -1 && errno != EINTR) {
786 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
788 Log(LOG_ALERT, "%s exiting due to fatal errors!",
794 if (NGIRCd_SignalQuit)
795 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
796 else if (NGIRCd_SignalRestart)
797 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
802 * Write a text string into the socket of a connection.
803 * This function automatically appends CR+LF to the string and validates that
804 * the result is a valid IRC message (oversized messages are shortened, for
805 * example). Then it calls the Conn_Write() function to do the actual sending.
806 * @param Idx Index fo the connection.
807 * @param Format Format string, see printf().
808 * @return true on success, false otherwise.
812 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
815 Conn_WriteStr(Idx, Format, va_alist)
821 char buffer[COMMAND_LEN];
826 assert( Idx > NONE );
827 assert( Format != NULL );
830 va_start( ap, Format );
834 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
836 * The string that should be written to the socket is longer
837 * than the allowed size of COMMAND_LEN bytes (including both
838 * the CR and LF characters). This can be caused by the
839 * IRC_WriteXXX() functions when the prefix of this server had
840 * to be added to an already "quite long" command line which
841 * has been received from a regular IRC client, for example.
843 * We are not allowed to send such "oversized" messages to
844 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
845 * ("these messages SHALL NOT exceed 512 characters in length,
846 * counting all characters including the trailing CR-LF").
848 * So we have a big problem here: we should send more bytes
849 * to the network than we are allowed to and we don't know
850 * the originator (any more). The "old" behaviour of blaming
851 * the receiver ("next hop") is a bad idea (it could be just
852 * an other server only routing the message!), so the only
853 * option left is to shorten the string and to hope that the
854 * result is still somewhat useful ...
858 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
864 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
867 len = strlcat( buffer, "\r\n", sizeof( buffer ));
868 ok = Conn_Write(Idx, buffer, len);
869 My_Connections[Idx].msg_out++;
873 } /* Conn_WriteStr */
877 * Append Data to the outbound write buffer of a connection.
878 * @param Idx Index of the connection.
879 * @param Data pointer to the data.
880 * @param Len length of Data.
881 * @return true on success, false otherwise.
884 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
887 size_t writebuf_limit = WRITEBUFFER_LEN;
888 assert( Idx > NONE );
889 assert( Data != NULL );
892 c = Conn_GetClient(Idx);
895 /* Servers do get special write buffer limits, so they can generate
896 * all the messages that are required while peering. */
897 if (Client_Type(c) == CLIENT_SERVER)
898 writebuf_limit = WRITEBUFFER_SLINK_LEN;
900 /* Is the socket still open? A previous call to Conn_Write()
901 * may have closed the connection due to a fatal error.
902 * In this case it is sufficient to return an error, as well. */
903 if( My_Connections[Idx].sock <= NONE ) {
904 LogDebug("Skipped write on closed socket (connection %d).", Idx);
909 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
911 * Zip_Buffer() does all the dirty work for us: it flushes
912 * the (pre-)compression buffers if required and handles
913 * all error conditions. */
914 if (!Zip_Buffer(Idx, Data, Len))
920 /* Uncompressed link:
921 * Check if outbound buffer has enough space for the data. */
922 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
924 /* Buffer is full, flush it. Handle_Write deals with
925 * low-level errors, if any. */
926 if (!Handle_Write(Idx))
930 /* When the write buffer is still too big after flushing it,
931 * the connection will be killed. */
932 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
935 "Write buffer overflow (connection %d, size %lu byte)!",
937 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
938 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
942 /* Copy data to write buffer */
943 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
946 My_Connections[Idx].bytes_out += Len;
949 /* Adjust global write counter */
957 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
959 /* Close connection. Open pipes of asyncronous resolver
960 * sub-processes are closed down. */
966 double in_z_k, out_z_k;
970 assert( Idx > NONE );
972 /* Is this link already shutting down? */
973 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
974 /* Conn_Close() has been called recursively for this link;
975 * probabe reason: Handle_Write() failed -- see below. */
976 LogDebug("Recursive request to close connection: %d", Idx );
980 assert( My_Connections[Idx].sock > NONE );
982 /* Mark link as "closing" */
983 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
985 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
986 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
987 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
989 /* Search client, if any */
990 c = Conn_GetClient( Idx );
992 /* Should the client be informed? */
995 /* Send statistics to client if registered as user: */
996 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
998 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
999 Client_ID(Client_ThisServer()), Client_ID(c),
1001 (double)My_Connections[Idx].bytes_in / 1024,
1002 (double)My_Connections[Idx].bytes_out / 1024);
1005 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1007 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1009 Conn_WriteStr(Idx, "ERROR :Closing connection.");
1012 /* Try to write out the write buffer. Note: Handle_Write() eventually
1013 * removes the CLIENT structure associated with this connection if an
1014 * error occurs! So we have to re-check if there is still an valid
1015 * CLIENT structure after calling Handle_Write() ...*/
1016 (void)Handle_Write( Idx );
1018 /* Search client, if any (re-check!) */
1019 c = Conn_GetClient( Idx );
1021 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1022 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1023 ConnSSL_Free(&My_Connections[Idx]);
1026 /* Shut down socket */
1027 if (! io_close(My_Connections[Idx].sock)) {
1028 /* Oops, we can't close the socket!? This is ... ugly! */
1030 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1031 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1032 port, strerror(errno));
1035 /* Mark socket as invalid: */
1036 My_Connections[Idx].sock = NONE;
1038 /* If there is still a client, unregister it now */
1040 Client_Destroy(c, LogMsg, FwdMsg, true);
1042 /* Calculate statistics and log information */
1043 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1044 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1046 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1047 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1048 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1049 /* Make sure that no division by zero can occur during
1050 * the calculation of in_p and out_p: in_z_k and out_z_k
1051 * are non-zero, that's guaranteed by the protocol until
1052 * compression can be enabled. */
1057 in_p = (int)(( in_k * 100 ) / in_z_k );
1058 out_p = (int)(( out_k * 100 ) / out_z_k );
1060 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1061 Idx, My_Connections[Idx].host, port,
1062 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1068 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1069 Idx, My_Connections[Idx].host, port,
1073 /* cancel running resolver */
1074 if (Resolve_INPROGRESS(&My_Connections[Idx].res_stat))
1075 Resolve_Shutdown(&My_Connections[Idx].res_stat);
1077 /* Servers: Modify time of next connect attempt? */
1078 Conf_UnsetServer( Idx );
1081 /* Clean up zlib, if link was compressed */
1082 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1083 inflateEnd( &My_Connections[Idx].zip.in );
1084 deflateEnd( &My_Connections[Idx].zip.out );
1085 array_free(&My_Connections[Idx].zip.rbuf);
1086 array_free(&My_Connections[Idx].zip.wbuf);
1090 array_free(&My_Connections[Idx].rbuf);
1091 array_free(&My_Connections[Idx].wbuf);
1093 /* Clean up connection structure (=free it) */
1094 Init_Conn_Struct( Idx );
1096 assert(NumConnections > 0);
1099 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1100 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1107 return NumConnections;
1114 return NumConnectionsMax;
1115 } /* Conn_CountMax */
1119 Conn_CountAccepted(void)
1121 return NumConnectionsAccepted;
1122 } /* Conn_CountAccepted */
1126 Conn_SyncServerStruct( void )
1128 /* Synchronize server structures (connection IDs):
1129 * connections <-> configuration */
1135 for( i = 0; i < Pool_Size; i++ ) {
1136 /* Established connection? */
1137 if (My_Connections[i].sock < 0)
1140 /* Server connection? */
1141 client = Conn_GetClient( i );
1142 if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
1144 for( c = 0; c < MAX_SERVERS; c++ )
1146 /* Configured server? */
1147 if( ! Conf_Server[c].host[0] ) continue;
1150 if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 )
1151 Conf_Server[c].conn_id = i;
1154 } /* SyncServerStruct */
1158 * Send out data of write buffer; connect new sockets.
1161 Handle_Write( CONN_ID Idx )
1166 assert( Idx > NONE );
1167 if ( My_Connections[Idx].sock < 0 ) {
1168 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1171 assert( My_Connections[Idx].sock > NONE );
1173 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1176 if (wdatalen == 0) {
1177 /* Write buffer is empty, so we try to flush the compression
1178 * buffer and get some data to work with from there :-) */
1179 if (!Zip_Flush(Idx))
1182 /* Now the write buffer most probably has changed: */
1183 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1187 if (wdatalen == 0) {
1188 /* Still no data, fine. */
1189 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1194 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1198 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1199 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1203 len = write(My_Connections[Idx].sock,
1204 array_start(&My_Connections[Idx].wbuf), wdatalen );
1207 if (errno == EAGAIN || errno == EINTR)
1210 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1211 Idx, My_Connections[Idx].sock, strerror(errno));
1212 Conn_Close(Idx, "Write error!", NULL, false);
1216 /* move any data not yet written to beginning */
1217 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1220 } /* Handle_Write */
1224 Count_Connections(ng_ipaddr_t *a)
1229 for (i = 0; i < Pool_Size; i++) {
1230 if (My_Connections[i].sock <= NONE)
1232 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1236 } /* Count_Connections */
1240 * Initialize new client connection on a listening socket.
1241 * @param Sock Listening socket descriptor
1242 * @return Accepted socket descriptor or -1 on error
1245 New_Connection(int Sock)
1248 struct request_info req;
1250 ng_ipaddr_t new_addr;
1251 char ip_str[NG_INET_ADDRSTRLEN];
1252 int new_sock, new_sock_len, identsock;
1256 assert(Sock > NONE);
1258 new_sock_len = (int)sizeof(new_addr);
1259 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1260 (socklen_t *)&new_sock_len);
1262 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1265 NumConnectionsAccepted++;
1267 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1268 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1269 Simple_Message(new_sock, "ERROR :Internal Server Error");
1275 /* Validate socket using TCP Wrappers */
1276 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1277 RQ_CLIENT_SIN, &new_addr, NULL);
1279 if (!hosts_access(&req)) {
1281 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1282 Simple_Message(new_sock, "ERROR :Connection refused");
1288 if (!Init_Socket(new_sock))
1291 /* Check global connection limit */
1292 if ((Conf_MaxConnections > 0) &&
1293 (NumConnections >= (size_t) Conf_MaxConnections)) {
1294 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1295 Conf_MaxConnections);
1296 Simple_Message(new_sock, "ERROR :Connection limit reached");
1301 /* Check IP-based connection limit */
1302 cnt = Count_Connections(&new_addr);
1303 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1304 /* Access denied, too many connections from this IP address! */
1306 "Refused connection from %s: too may connections (%ld) from this IP address!",
1308 Simple_Message(new_sock,
1309 "ERROR :Connection refused, too many connections from your IP address!");
1314 if (new_sock >= Pool_Size) {
1315 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1316 (size_t) new_sock)) {
1318 "Can't allocate memory! [New_Connection]");
1319 Simple_Message(new_sock, "ERROR: Internal error");
1323 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1324 new_sock, array_length(&My_ConnArray,
1325 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1327 /* Adjust pointer to new block */
1328 My_Connections = array_start(&My_ConnArray);
1329 while (Pool_Size <= new_sock)
1330 Init_Conn_Struct(Pool_Size++);
1333 /* register callback */
1334 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1336 "Can't accept connection: io_event_create failed!");
1337 Simple_Message(new_sock, "ERROR :Internal error");
1342 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1345 "Can't accept connection: can't create client structure!");
1346 Simple_Message(new_sock, "ERROR :Internal error");
1351 Init_Conn_Struct(new_sock);
1352 My_Connections[new_sock].sock = new_sock;
1353 My_Connections[new_sock].addr = new_addr;
1354 My_Connections[new_sock].client = c;
1356 /* Set initial hostname to IP address. This becomes overwritten when
1357 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1358 if (ng_ipaddr_af(&new_addr) != AF_INET)
1359 snprintf(My_Connections[new_sock].host,
1360 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1362 strlcpy(My_Connections[new_sock].host, ip_str,
1363 sizeof(My_Connections[new_sock].host));
1365 Client_SetHostname(c, My_Connections[new_sock].host);
1367 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1368 new_sock, My_Connections[new_sock].host,
1369 ng_ipaddr_getport(&new_addr), Sock);
1371 identsock = new_sock;
1377 Resolve_Addr(&My_Connections[new_sock].res_stat, &new_addr,
1378 identsock, cb_Read_Resolver_Result);
1380 /* ngIRCd waits up to 4 seconds for the result of the asynchronous
1381 * DNS and IDENT resolver subprocess using the "penalty" mechanism.
1382 * If there are results earlier, the delay is aborted. */
1383 Conn_SetPenalty(new_sock, 4);
1385 Account_Connection();
1387 } /* New_Connection */
1391 Account_Connection(void)
1394 if (NumConnections > NumConnectionsMax)
1395 NumConnectionsMax = NumConnections;
1396 LogDebug("Total number of connections now %lu (max %lu).",
1397 NumConnections, NumConnectionsMax);
1398 } /* Account_Connection */
1402 Socket2Index( int Sock )
1404 assert( Sock >= 0 );
1406 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1407 /* the Connection was already closed again, likely due to
1409 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1413 } /* Socket2Index */
1417 * Read data from the network to the read buffer. If an error occures,
1418 * the socket of this connection will be shut down.
1421 Read_Request( CONN_ID Idx )
1424 static const unsigned int maxbps = COMMAND_LEN / 2;
1425 char readbuf[READBUFFER_LEN];
1428 assert( Idx > NONE );
1429 assert( My_Connections[Idx].sock > NONE );
1432 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1433 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1435 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1438 /* Read buffer is full */
1440 "Receive buffer overflow (connection %d): %d bytes!",
1441 Idx, array_bytes(&My_Connections[Idx].rbuf));
1442 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1447 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1448 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1451 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1453 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1454 My_Connections[Idx].host,
1455 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1456 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1458 "Socket closed!", "Client closed connection",
1464 if( errno == EAGAIN ) return;
1465 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1466 Idx, My_Connections[Idx].sock, strerror(errno));
1467 Conn_Close(Idx, "Read error!", "Client closed connection",
1472 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1473 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1476 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1478 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1485 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1486 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1487 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1491 /* Update connection statistics */
1492 My_Connections[Idx].bytes_in += len;
1494 /* Update timestamp of last data received if this connection is
1495 * registered as a user, server or service connection. Don't update
1496 * otherwise, so users have at least Conf_PongTimeout seconds time to
1497 * register with the IRC server -- see Check_Connections().
1498 * Set "lastping", too, so we can handle time shifts backwards ... */
1499 c = Conn_GetClient(Idx);
1500 if (c && (Client_Type(c) == CLIENT_USER
1501 || Client_Type(c) == CLIENT_SERVER
1502 || Client_Type(c) == CLIENT_SERVICE)) {
1504 if (My_Connections[Idx].lastdata != t)
1505 My_Connections[Idx].bps = 0;
1507 My_Connections[Idx].lastdata = t;
1508 My_Connections[Idx].lastping = My_Connections[Idx].lastdata;
1511 /* Look at the data in the (read-) buffer of this connection */
1512 My_Connections[Idx].bps += Handle_Buffer(Idx);
1513 if (Client_Type(c) != CLIENT_SERVER
1514 && My_Connections[Idx].bps >= maxbps) {
1515 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1516 Idx, My_Connections[Idx].bps, maxbps);
1517 Conn_SetPenalty(Idx, 1);
1519 } /* Read_Request */
1523 * Handle all data in the connection read-buffer.
1524 * Data is processed until no complete command is left in the read buffer,
1525 * or MAX_COMMANDS[_SERVER] commands were processed.
1526 * When a fatal error occurs, the connection is shut down.
1527 * @param Idx Index of the connection.
1528 * @return number of bytes processed.
1531 Handle_Buffer(CONN_ID Idx)
1534 char *ptr1, *ptr2, *first_eol;
1542 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1545 c = Conn_GetClient(Idx);
1548 /* Servers do get special command limits, so they can process
1549 * all the messages that are required while peering. */
1550 if (Client_Type(c) == CLIENT_SERVER)
1551 maxcmd = MAX_COMMANDS_SERVER;
1553 starttime = time(NULL);
1554 for (i=0; i < maxcmd; i++) {
1556 if (My_Connections[Idx].delaytime > starttime)
1559 /* Unpack compressed data, if compression is in use */
1560 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1561 /* When unzipping fails, Unzip_Buffer() shuts
1562 * down the connection itself */
1563 if (!Unzip_Buffer(Idx))
1568 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1571 /* Make sure that the buffer is NULL terminated */
1572 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1573 Conn_Close(Idx, NULL,
1574 "Can't allocate memory [Handle_Buffer]",
1579 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1580 * "IRC messages are always lines of characters terminated
1581 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1583 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1586 /* Check for non-RFC-compliant request (only CR or LF)?
1587 * Unfortunately, there are quite a few clients out there
1588 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1589 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1590 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1592 /* Check if there is a single CR or LF _before_ the
1593 * corerct CR+LF line terminator: */
1594 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1595 if (first_eol < ptr) {
1596 /* Single CR or LF before CR+LF found */
1600 } else if (ptr1 || ptr2) {
1601 /* No CR+LF terminated command found, but single
1602 * CR or LF found ... */
1604 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1606 ptr = ptr1 ? ptr1 : ptr2;
1614 /* Complete (=line terminated) request found, handle it! */
1617 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1619 if (len > (COMMAND_LEN - 1)) {
1620 /* Request must not exceed 512 chars (incl. CR+LF!),
1621 * see RFC 2812. Disconnect Client if this happens. */
1623 "Request too long (connection %d): %d bytes (max. %d expected)!",
1624 Idx, array_bytes(&My_Connections[Idx].rbuf),
1626 Conn_Close(Idx, NULL, "Request too long", true);
1630 len_processed += (unsigned int)len;
1632 /* Request is empty (only '\r\n', '\r' or '\n');
1633 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1634 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1638 /* remember if stream is already compressed */
1639 old_z = My_Connections[Idx].options & CONN_ZIP;
1642 My_Connections[Idx].msg_in++;
1644 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1645 return 0; /* error -> connection has been closed */
1647 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1648 LogDebug("Connection %d: %d bytes left in read buffer.",
1649 Idx, array_bytes(&My_Connections[Idx].rbuf));
1651 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1652 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1653 /* The last command activated socket compression.
1654 * Data that was read after that needs to be copied
1655 * to the unzip buffer for decompression: */
1657 (&My_Connections[Idx].zip.rbuf,
1658 &My_Connections[Idx].rbuf)) {
1659 Conn_Close(Idx, NULL,
1660 "Can't allocate memory [Handle_Buffer]",
1665 array_trunc(&My_Connections[Idx].rbuf);
1667 ("Moved already received data (%u bytes) to uncompression buffer.",
1668 array_bytes(&My_Connections[Idx].zip.rbuf));
1672 return len_processed;
1673 } /* Handle_Buffer */
1677 Check_Connections(void)
1679 /* check if connections are alive. if not, play PING-PONG first.
1680 * if this doesn't help either, disconnect client. */
1685 for (i = 0; i < Pool_Size; i++) {
1686 if (My_Connections[i].sock < 0)
1689 c = Conn_GetClient(i);
1690 if (c && ((Client_Type(c) == CLIENT_USER)
1691 || (Client_Type(c) == CLIENT_SERVER)
1692 || (Client_Type(c) == CLIENT_SERVICE))) {
1693 /* connected User, Server or Service */
1694 if (My_Connections[i].lastping >
1695 My_Connections[i].lastdata) {
1696 /* We already sent a ping */
1697 if (My_Connections[i].lastping <
1698 time(NULL) - Conf_PongTimeout) {
1701 ("Connection %d: Ping timeout: %d seconds.",
1702 i, Conf_PongTimeout);
1703 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1704 Conn_Close(i, NULL, msg, true);
1706 } else if (My_Connections[i].lastdata <
1707 time(NULL) - Conf_PingTimeout) {
1708 /* We need to send a PING ... */
1709 LogDebug("Connection %d: sending PING ...", i);
1710 My_Connections[i].lastping = time(NULL);
1711 Conn_WriteStr(i, "PING :%s",
1712 Client_ID(Client_ThisServer()));
1715 /* The connection is not fully established yet, so
1716 * we don't do the PING-PONG game here but instead
1717 * disconnect the client after "a short time" if it's
1718 * still not registered. */
1720 if (My_Connections[i].lastdata <
1721 time(NULL) - Conf_PongTimeout) {
1723 ("Unregistered connection %d timed out ...",
1725 Conn_Close(i, NULL, "Timeout", false);
1729 } /* Check_Connections */
1733 Check_Servers( void )
1735 /* Check if we can establish further server links */
1740 /* Check all configured servers */
1741 for( i = 0; i < MAX_SERVERS; i++ ) {
1742 /* Valid outgoing server which isn't already connected or disabled? */
1743 if(( ! Conf_Server[i].host[0] ) || ( ! Conf_Server[i].port > 0 ) ||
1744 ( Conf_Server[i].conn_id > NONE ) || ( Conf_Server[i].flags & CONF_SFLAG_DISABLED ))
1747 /* Is there already a connection in this group? */
1748 if( Conf_Server[i].group > NONE ) {
1749 for (n = 0; n < MAX_SERVERS; n++) {
1750 if (n == i) continue;
1751 if ((Conf_Server[n].conn_id != NONE) &&
1752 (Conf_Server[n].group == Conf_Server[i].group))
1755 if (n < MAX_SERVERS) continue;
1758 /* Check last connect attempt? */
1759 time_now = time(NULL);
1760 if( Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1763 /* Okay, try to connect now */
1764 Conf_Server[i].lasttry = time_now;
1765 Conf_Server[i].conn_id = SERVER_WAIT;
1766 assert(Resolve_Getfd(&Conf_Server[i].res_stat) < 0);
1767 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host, cb_Connect_to_Server);
1769 } /* Check_Servers */
1773 New_Server( int Server , ng_ipaddr_t *dest)
1775 /* Establish new server link */
1776 char ip_str[NG_INET_ADDRSTRLEN];
1777 int af_dest, res, new_sock;
1780 assert( Server > NONE );
1782 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1783 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1787 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1788 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1790 af_dest = ng_ipaddr_af(dest);
1791 new_sock = socket(af_dest, SOCK_STREAM, 0);
1793 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1797 if (!Init_Socket(new_sock))
1800 /* is a bind address configured? */
1801 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1802 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1803 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1804 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1806 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1807 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1809 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1810 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1811 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1812 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1817 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1819 "Cannot allocate memory for server connection (socket %d)",
1825 My_Connections = array_start(&My_ConnArray);
1827 assert(My_Connections[new_sock].sock <= 0);
1829 Init_Conn_Struct(new_sock);
1831 ng_ipaddr_tostr_r(dest, ip_str);
1832 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1834 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1839 /* Conn_Close() decrements this counter again */
1840 Account_Connection();
1841 Client_SetIntroducer( c, c );
1842 Client_SetToken( c, TOKEN_OUTBOUND );
1844 /* Register connection */
1845 Conf_Server[Server].conn_id = new_sock;
1846 My_Connections[new_sock].sock = new_sock;
1847 My_Connections[new_sock].addr = *dest;
1848 My_Connections[new_sock].client = c;
1849 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1850 sizeof(My_Connections[new_sock].host ));
1852 /* Register new socket */
1853 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1854 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1855 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1856 Init_Conn_Struct( new_sock );
1857 Conf_Server[Server].conn_id = NONE;
1860 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1861 &Conf_Server[Server] ))
1863 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1864 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1865 Init_Conn_Struct( new_sock );
1866 Conf_Server[Server].conn_id = NONE;
1870 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1871 new_sock, My_Connections[new_sock].sock, NumConnections);
1872 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1877 * Initialize connection structure.
1880 Init_Conn_Struct(CONN_ID Idx)
1882 time_t now = time(NULL);
1884 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1885 My_Connections[Idx].sock = -1;
1886 My_Connections[Idx].signon = now;
1887 My_Connections[Idx].lastdata = now;
1888 My_Connections[Idx].lastprivmsg = now;
1889 Resolve_Init(&My_Connections[Idx].res_stat);
1890 } /* Init_Conn_Struct */
1894 Init_Socket( int Sock )
1896 /* Initialize socket (set options) */
1900 if (!io_setnonblock(Sock)) {
1901 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1906 /* Don't block this port after socket shutdown */
1908 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1910 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1911 /* ignore this error */
1914 /* Set type of service (TOS) */
1915 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
1916 value = IPTOS_LOWDELAY;
1917 LogDebug("Setting IP_TOS on socket %d to IPTOS_LOWDELAY.", Sock);
1918 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
1919 (socklen_t) sizeof(value))) {
1920 Log(LOG_ERR, "Can't set socket option IP_TOS: %s!",
1922 /* ignore this error */
1931 cb_Connect_to_Server(int fd, UNUSED short events)
1933 /* Read result of resolver sub-process from pipe and start connection */
1936 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1937 four so we can log the 'more than we can handle'
1938 condition. First result is tried immediately, rest
1939 is saved for later if needed. */
1941 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1943 for (i=0; i < MAX_SERVERS; i++) {
1944 if (Resolve_Getfd(&Conf_Server[i].res_stat) == fd )
1948 if( i >= MAX_SERVERS) {
1949 /* Ops, no matching server found?! */
1951 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1955 /* Read result from pipe */
1956 len = Resolve_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1960 assert((len % sizeof(ng_ipaddr_t)) == 0);
1962 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1964 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
1965 if (len > sizeof(ng_ipaddr_t)) {
1966 /* more than one address for this hostname, remember them
1967 * in case first address is unreachable/not available */
1968 len -= sizeof(ng_ipaddr_t);
1969 if (len > sizeof(Conf_Server[i].dst_addr)) {
1970 len = sizeof(Conf_Server[i].dst_addr);
1972 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1974 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1977 New_Server(i, dest_addrs);
1978 } /* cb_Read_Forward_Lookup */
1982 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
1984 /* Read result of resolver sub-process from pipe and update the
1985 * apropriate connection/client structure(s): hostname and/or
1986 * IDENT user name.*/
1993 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
1995 char readbuf[HOST_LEN + 1];
1998 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2000 /* Search associated connection ... */
2001 for( i = 0; i < Pool_Size; i++ ) {
2002 if(( My_Connections[i].sock != NONE )
2003 && ( Resolve_Getfd(&My_Connections[i].res_stat) == r_fd ))
2006 if( i >= Pool_Size ) {
2007 /* Ops, none found? Probably the connection has already
2008 * been closed!? We'll ignore that ... */
2010 LogDebug("Resolver: Got callback for unknown connection!?");
2014 /* Read result from pipe */
2015 len = Resolve_Read(&My_Connections[i].res_stat, readbuf, sizeof readbuf -1);
2019 readbuf[len] = '\0';
2020 identptr = strchr(readbuf, '\n');
2021 assert(identptr != NULL);
2023 Log( LOG_CRIT, "Resolver: Got malformed result!");
2028 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2029 /* Okay, we got a complete result: this is a host name for outgoing
2030 * connections and a host name and IDENT user name (if enabled) for
2031 * incoming connections.*/
2032 assert ( My_Connections[i].sock >= 0 );
2033 /* Incoming connection. Search client ... */
2034 c = Conn_GetClient( i );
2035 assert( c != NULL );
2037 /* Only update client information of unregistered clients.
2038 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2039 * the resolver results, so we don't have to worry to override settings
2040 * from these commands here. */
2041 if(Client_Type(c) == CLIENT_UNKNOWN) {
2042 strlcpy(My_Connections[i].host, readbuf,
2043 sizeof(My_Connections[i].host));
2044 Client_SetHostname(c, readbuf);
2048 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
2049 Client_SetUser(c, identptr, true);
2051 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2056 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2058 /* Reset penalty time */
2059 Conn_ResetPenalty( i );
2060 } /* cb_Read_Resolver_Result */
2064 * Write a "simple" (error) message to a socket.
2065 * The message is sent without using the connection write buffers, without
2066 * compression/encryption, and even without any error reporting. It is
2067 * designed for error messages of e.g. New_Connection(). */
2069 Simple_Message(int Sock, const char *Msg)
2071 char buf[COMMAND_LEN];
2074 assert(Sock > NONE);
2075 assert(Msg != NULL);
2077 strlcpy(buf, Msg, sizeof buf - 2);
2078 len = strlcat(buf, "\r\n", sizeof buf);
2079 if (write(Sock, buf, len) < 0) {
2080 /* Because this function most probably got called to log
2081 * an error message, any write error is ignored here to
2082 * avoid an endless loop. But casting the result of write()
2083 * to "void" doesn't satisfy the GNU C code attribute
2084 * "warn_unused_result" which is used by some versions of
2085 * glibc (e.g. 2.11.1), therefore this silly error
2086 * "handling" code here :-( */
2089 } /* Simple_Error */
2093 * Get CLIENT structure that belongs to a local connection identified by its
2094 * index number. Each connection belongs to a client by definition, so it is
2095 * not required that the caller checks for NULL return values.
2096 * @param Idx Connection index number
2097 * @return Pointer to CLIENT structure
2100 Conn_GetClient( CONN_ID Idx )
2105 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2107 return c ? c->client : NULL;
2114 * Get information about used SSL chiper.
2115 * @param Idx Connection index number
2116 * @param buf Buffer for returned information text
2117 * @param len Size of return buffer "buf"
2118 * @return true on success, false otherwise
2121 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2125 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2126 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2131 * Check if a connection is SSL-enabled or not.
2132 * @param Idx Connection index number
2133 * @return true if connection is SSL-enabled, false otherwise.
2136 Conn_UsesSSL(CONN_ID Idx)
2140 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2141 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);