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"
69 #include "ng_ipaddr.h"
75 # include "rendezvous.h"
81 #define SERVER_WAIT (NONE - 1)
83 #define MAX_COMMANDS 3
84 #define MAX_COMMANDS_SERVER 10
87 static bool Handle_Write PARAMS(( CONN_ID Idx ));
88 static bool Conn_Write PARAMS(( CONN_ID Idx, char *Data, size_t Len ));
89 static int New_Connection PARAMS(( int Sock ));
90 static CONN_ID Socket2Index PARAMS(( int Sock ));
91 static void Read_Request PARAMS(( CONN_ID Idx ));
92 static unsigned int Handle_Buffer PARAMS(( CONN_ID Idx ));
93 static void Check_Connections PARAMS(( void ));
94 static void Check_Servers PARAMS(( void ));
95 static void Init_Conn_Struct PARAMS(( CONN_ID Idx ));
96 static bool Init_Socket PARAMS(( int Sock ));
97 static void New_Server PARAMS(( int Server, ng_ipaddr_t *dest ));
98 static void Simple_Message PARAMS(( int Sock, const char *Msg ));
99 static int NewListener PARAMS(( const char *listen_addr, UINT16 Port ));
100 static void Account_Connection PARAMS((void));
103 static array My_Listeners;
104 static array My_ConnArray;
105 static size_t NumConnections, NumConnectionsMax, NumConnectionsAccepted;
108 int allow_severity = LOG_INFO;
109 int deny_severity = LOG_ERR;
112 static void server_login PARAMS((CONN_ID idx));
115 extern struct SSLOptions Conf_SSLOptions;
116 static void cb_connserver_login_ssl PARAMS((int sock, short what));
117 static void cb_clientserver_ssl PARAMS((int sock, short what));
119 static void cb_Read_Resolver_Result PARAMS((int sock, UNUSED short what));
120 static void cb_Connect_to_Server PARAMS((int sock, UNUSED short what));
121 static void cb_clientserver PARAMS((int sock, short what));
125 * IO callback for listening sockets: handle new connections. This callback
126 * gets called when a new non-SSL connection should be accepted.
127 * @param sock Socket descriptor
128 * @param irrelevant (ignored IO specification)
131 cb_listen(int sock, short irrelevant)
134 (void) New_Connection(sock);
140 * IO callback for listening SSL sockets: handle new connections. This callback
141 * gets called when a new SSL-enabled connection should be accepted.
142 * @param sock Socket descriptor
143 * @param irrelevant (ignored IO specification)
146 cb_listen_ssl(int sock, short irrelevant)
151 fd = New_Connection(sock);
154 io_event_setcb(My_Connections[fd].sock, cb_clientserver_ssl);
160 * IO callback for new outgoing non-SSL server connections.
161 * @param sock Socket descriptor
162 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
165 cb_connserver(int sock, UNUSED short what)
167 int res, err, server;
169 CONN_ID idx = Socket2Index( sock );
172 LogDebug("cb_connserver wants to write on unknown socket?!");
177 assert(what & IO_WANTWRITE);
179 /* Make sure that the server is still configured; it could have been
180 * removed in the meantime! */
181 server = Conf_GetServer(idx);
183 Log(LOG_ERR, "Connection on socket %d to \"%s\" aborted!",
184 sock, My_Connections[idx].host);
185 Conn_Close(idx, "Connection aborted!", NULL, false);
189 /* connect() finished, get result. */
190 sock_len = (socklen_t)sizeof(err);
191 res = getsockopt(My_Connections[idx].sock, SOL_SOCKET, SO_ERROR,
193 assert(sock_len == sizeof(err));
195 /* Error while connecting? */
196 if ((res != 0) || (err != 0)) {
198 Log(LOG_CRIT, "getsockopt (connection %d): %s!",
199 idx, strerror(errno));
202 "Can't connect socket to \"%s:%d\" (connection %d): %s!",
203 My_Connections[idx].host, Conf_Server[server].port,
206 Conn_Close(idx, "Can't connect!", NULL, false);
208 if (ng_ipaddr_af(&Conf_Server[server].dst_addr[0])) {
209 /* more addresses to try... */
210 New_Server(res, &Conf_Server[server].dst_addr[0]);
211 /* connection to dst_addr[0] is now in progress, so
212 * remove this address... */
213 Conf_Server[server].dst_addr[0] =
214 Conf_Server[server].dst_addr[1];
215 memset(&Conf_Server[server].dst_addr[1], 0,
216 sizeof(Conf_Server[server].dst_addr[1]));
221 /* connect() succeeded, remove all additional addresses */
222 memset(&Conf_Server[server].dst_addr, 0,
223 sizeof(Conf_Server[server].dst_addr));
225 Conn_OPTION_DEL( &My_Connections[idx], CONN_ISCONNECTING );
227 if ( Conn_OPTION_ISSET( &My_Connections[idx], CONN_SSL_CONNECT )) {
228 io_event_setcb( sock, cb_connserver_login_ssl );
229 io_event_add( sock, IO_WANTWRITE|IO_WANTREAD );
238 * Login to a remote server.
239 * @param idx Connection index
242 server_login(CONN_ID idx)
244 Log( LOG_INFO, "Connection %d with \"%s:%d\" established. Now logging in ...", idx,
245 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
247 io_event_setcb( My_Connections[idx].sock, cb_clientserver);
248 io_event_add( My_Connections[idx].sock, IO_WANTREAD|IO_WANTWRITE);
250 /* Send PASS and SERVER command to peer */
251 Conn_WriteStr( idx, "PASS %s %s", Conf_Server[Conf_GetServer( idx )].pwd_out, NGIRCd_ProtoID );
252 Conn_WriteStr( idx, "SERVER %s :%s", Conf_ServerName, Conf_ServerInfo );
258 * IO callback for new outgoing SSL-enabled server connections.
259 * @param sock Socket descriptor
260 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
263 cb_connserver_login_ssl(int sock, short unused)
265 CONN_ID idx = Socket2Index(sock);
273 switch (ConnSSL_Connect( &My_Connections[idx])) {
275 case 0: LogDebug("ConnSSL_Connect: not ready");
278 Log(LOG_ERR, "SSL connection on socket %d failed!", sock);
279 Conn_Close(idx, "Can't connect!", NULL, false);
283 Log( LOG_INFO, "SSL connection %d with \"%s:%d\" established.", idx,
284 My_Connections[idx].host, Conf_Server[Conf_GetServer( idx )].port );
292 * IO callback for established non-SSL client and server connections.
293 * @param sock Socket descriptor
294 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
297 cb_clientserver(int sock, short what)
299 CONN_ID idx = Socket2Index(sock);
308 if (what & IO_WANTREAD
309 || (Conn_OPTION_ISSET(&My_Connections[idx], CONN_SSL_WANT_WRITE))) {
310 /* if TLS layer needs to write additional data, call
311 * Read_Request() instead so that SSL/TLS can continue */
315 if (what & IO_WANTREAD)
318 if (what & IO_WANTWRITE)
325 * IO callback for established SSL-enabled client and server connections.
326 * @param sock Socket descriptor
327 * @param what IO specification (IO_WANTREAD/IO_WANTWRITE/...)
330 cb_clientserver_ssl(int sock, short what)
332 CONN_ID idx = Socket2Index(sock);
341 switch (ConnSSL_Accept(&My_Connections[idx])) {
345 return; /* EAGAIN: callback will be invoked again by IO layer */
347 Conn_Close(idx, "SSL accept error, closing socket", "SSL accept error", false);
350 if (what & IO_WANTREAD)
353 if (what & IO_WANTWRITE)
356 io_event_setcb(sock, cb_clientserver); /* SSL handshake completed */
362 * Initialite connecion module.
369 /* Speicher fuer Verbindungs-Pool anfordern */
370 Pool_Size = CONNECTION_POOL;
371 if ((Conf_MaxConnections > 0) &&
372 (Pool_Size > Conf_MaxConnections))
373 Pool_Size = Conf_MaxConnections;
375 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)Pool_Size)) {
376 Log(LOG_EMERG, "Can't allocate memory! [Conn_Init]");
380 /* FIXME: My_Connetions/Pool_Size is needed by other parts of the
381 * code; remove them! */
382 My_Connections = (CONNECTION*) array_start(&My_ConnArray);
384 LogDebug("Allocated connection pool for %d items (%ld bytes).",
385 array_length(&My_ConnArray, sizeof(CONNECTION)),
386 array_bytes(&My_ConnArray));
388 assert(array_length(&My_ConnArray, sizeof(CONNECTION)) >= (size_t)Pool_Size);
390 array_free( &My_Listeners );
392 for (i = 0; i < Pool_Size; i++)
398 * Clean up connection module.
405 Conn_ExitListeners();
407 LogDebug("Shutting down all connections ..." );
408 for( idx = 0; idx < Pool_Size; idx++ ) {
409 if( My_Connections[idx].sock > NONE ) {
410 Conn_Close( idx, NULL, NGIRCd_SignalRestart ?
411 "Server going down (restarting)":"Server going down", true );
415 array_free(&My_ConnArray);
416 My_Connections = NULL;
418 io_library_shutdown();
423 * Close all sockets (file descriptors) of open connections.
424 * This is useful in forked child processes, for example, to make sure that
425 * they don't hold connections open that the main process wants to close.
428 Conn_CloseAllSockets(void)
432 for(idx = 0; idx < Pool_Size; idx++) {
433 if(My_Connections[idx].sock > NONE)
434 close(My_Connections[idx].sock);
440 ports_initlisteners(array *a, const char *listen_addr, void (*func)(int,short))
442 unsigned int created = 0;
447 len = array_length(a, sizeof (UINT16));
448 port = array_start(a);
450 fd = NewListener(listen_addr, *port);
455 if (!io_event_create( fd, IO_WANTREAD, func )) {
456 Log( LOG_ERR, "io_event_create(): Could not add listening fd %d (port %u): %s!",
457 fd, (unsigned int) *port, strerror(errno));
470 * Initialize all listening sockets.
471 * @return Number of created listening sockets
474 Conn_InitListeners( void )
476 /* Initialize ports on which the server should accept connections */
477 unsigned int created = 0;
478 char *copy, *listen_addr;
480 assert(Conf_ListenAddress);
482 /* can't use Conf_ListenAddress directly, see below */
483 copy = strdup(Conf_ListenAddress);
485 Log(LOG_CRIT, "Cannot copy %s: %s", Conf_ListenAddress, strerror(errno));
488 listen_addr = strtok(copy, ",");
490 while (listen_addr) {
491 ngt_TrimStr(listen_addr);
493 created += ports_initlisteners(&Conf_ListenPorts, listen_addr, cb_listen);
495 created += ports_initlisteners(&Conf_SSLOptions.ListenPorts, listen_addr, cb_listen_ssl);
499 listen_addr = strtok(NULL, ",");
502 /* Can't free() Conf_ListenAddress here: on REHASH, if the config file
503 * cannot be re-loaded, we'd end up with a NULL Conf_ListenAddress.
504 * Instead, free() takes place in conf.c, before the config file
505 * is being parsed. */
509 } /* Conn_InitListeners */
513 Conn_ExitListeners( void )
515 /* Close down all listening sockets */
519 Rendezvous_UnregisterListeners( );
522 arraylen = array_length(&My_Listeners, sizeof (int));
524 "Shutting down all listening sockets (%d total) ...", arraylen);
525 fd = array_start(&My_Listeners);
530 LogDebug("Listening socket %d closed.", *fd );
533 array_free(&My_Listeners);
534 } /* Conn_ExitListeners */
538 InitSinaddrListenAddr(ng_ipaddr_t *addr, const char *listen_addrstr, UINT16 Port)
542 ret = ng_ipaddr_init(addr, listen_addrstr, Port);
544 assert(listen_addrstr);
545 Log(LOG_CRIT, "Can't bind to [%s]:%u: can't convert ip address \"%s\"",
546 listen_addrstr, Port, listen_addrstr);
553 set_v6_only(int af, int sock)
555 #if defined(IPV6_V6ONLY) && defined(WANT_IPV6)
561 if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &on, (socklen_t)sizeof(on)))
562 Log(LOG_ERR, "Could not set IPV6_V6ONLY: %s", strerror(errno));
570 /* return new listening port file descriptor or -1 on failure */
572 NewListener(const char *listen_addr, UINT16 Port)
574 /* Create new listening socket on specified port */
578 char name[CLIENT_ID_LEN], *info;
580 if (!InitSinaddrListenAddr(&addr, listen_addr, Port))
583 af = ng_ipaddr_af(&addr);
584 sock = socket(af, SOCK_STREAM, 0);
586 Log(LOG_CRIT, "Can't create socket (af %d) : %s!", af, strerror(errno));
590 set_v6_only(af, sock);
592 if (!Init_Socket(sock))
595 if (bind(sock, (struct sockaddr *)&addr, ng_ipaddr_salen(&addr)) != 0) {
596 Log(LOG_CRIT, "Can't bind socket to address %s:%d - %s",
597 ng_ipaddr_tostr(&addr), Port, strerror(errno));
602 if( listen( sock, 10 ) != 0 ) {
603 Log( LOG_CRIT, "Can't listen on socket: %s!", strerror( errno ));
608 /* keep fd in list so we can close it when ngircd restarts/shuts down */
609 if (!array_catb( &My_Listeners,(char*) &sock, sizeof(int) )) {
610 Log( LOG_CRIT, "Can't add socket to My_Listeners array: %s!", strerror( errno ));
615 Log(LOG_INFO, "Now listening on [%s]:%d (socket %d).", ng_ipaddr_tostr(&addr), Port, sock);
618 /* Get best server description text */
619 if( ! Conf_ServerInfo[0] ) info = Conf_ServerName;
622 /* Use server info string */
624 if( Conf_ServerInfo[0] == '[' )
626 /* Cut off leading hostname part in "[]" */
627 info = strchr( Conf_ServerInfo, ']' );
631 while( *info == ' ' ) info++;
634 if( ! info ) info = Conf_ServerInfo;
637 /* Add port number to description if non-standard */
639 snprintf(name, sizeof name, "%s (port %u)", info,
642 strlcpy(name, info, sizeof name);
644 /* Register service */
645 Rendezvous_Register( name, MDNS_TYPE, Port );
653 * SSL/TLS connections require extra treatment:
654 * When either CONN_SSL_WANT_WRITE or CONN_SSL_WANT_READ is set, we
655 * need to take care of that first, before checking read/write buffers.
656 * For instance, while we might have data in our write buffer, the
657 * TLS/SSL protocol might need to read internal data first for TLS/SSL
660 * If this function returns true, such a condition is met and we have
661 * to reverse the condition (check for read even if we've data to write,
662 * do not check for read but writeability even if write-buffer is empty).
665 SSL_WantRead(const CONNECTION *c)
667 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_READ)) {
668 io_event_add(c->sock, IO_WANTREAD);
674 SSL_WantWrite(const CONNECTION *c)
676 if (Conn_OPTION_ISSET(c, CONN_SSL_WANT_WRITE)) {
677 io_event_add(c->sock, IO_WANTWRITE);
684 SSL_WantRead(UNUSED const CONNECTION *c) { return false; }
686 SSL_WantWrite(UNUSED const CONNECTION *c) { return false; }
691 * "Main Loop": Loop until shutdown or restart is signalled.
692 * This function loops until a shutdown or restart of ngIRCd is signalled and
693 * calls io_dispatch() to check for readable and writable sockets every second.
694 * It checks for status changes on pending connections (e. g. when a hostname
695 * has been resolved), checks for "penalties" and timeouts, and handles the
702 unsigned int wdatalen, bytes_processed;
706 while (!NGIRCd_SignalQuit && !NGIRCd_SignalRestart) {
710 Rendezvous_Handler();
713 /* Should the configuration be reloaded? */
714 if (NGIRCd_SignalRehash)
717 /* Check configured servers and established links */
721 /* Look for non-empty read buffers ... */
722 for (i = 0; i < Pool_Size; i++) {
723 if ((My_Connections[i].sock > NONE)
724 && (array_bytes(&My_Connections[i].rbuf) > 0)
725 && (My_Connections[i].delaytime <= t)) {
726 /* ... and try to handle the received data */
727 bytes_processed = Handle_Buffer(i);
728 /* if we processed data, and there might be
729 * more commands in the input buffer, do not
730 * try to read any more data now */
731 if (bytes_processed &&
732 array_bytes(&My_Connections[i].rbuf) > 2) {
734 ("Throttling connection %d: command limit reached!",
736 Conn_SetPenalty(i, 1);
741 /* Look for non-empty write buffers ... */
742 for (i = 0; i < Pool_Size; i++) {
743 if (My_Connections[i].sock <= NONE)
746 wdatalen = (unsigned int)array_bytes(&My_Connections[i].wbuf);
749 array_bytes(&My_Connections[i].zip.wbuf) > 0)
754 if (SSL_WantRead(&My_Connections[i]))
756 io_event_add(My_Connections[i].sock,
761 /* Check from which sockets we possibly could read ... */
762 for (i = 0; i < Pool_Size; i++) {
763 if (My_Connections[i].sock <= NONE)
766 if (SSL_WantWrite(&My_Connections[i]))
767 continue; /* TLS/SSL layer needs to write data; deal with this first */
769 if (Proc_InProgress(&My_Connections[i].proc_stat)) {
770 /* Wait for completion of forked subprocess
771 * and ignore the socket in the meantime ... */
772 io_event_del(My_Connections[i].sock,
777 if (Conn_OPTION_ISSET(&My_Connections[i], CONN_ISCONNECTING))
778 /* Wait for completion of connect() ... */
781 if (My_Connections[i].delaytime > t) {
782 /* There is a "penalty time" set: ignore socket! */
783 io_event_del(My_Connections[i].sock,
788 io_event_add(My_Connections[i].sock, IO_WANTREAD);
791 /* Set the timeout for reading from the network to 1 second,
792 * which is the granularity with witch we handle "penalty
793 * times" for example.
794 * Note: tv_sec/usec are undefined(!) after io_dispatch()
795 * returns, so we have to set it beforce each call to it! */
799 /* Wait for activity ... */
800 i = io_dispatch(&tv);
801 if (i == -1 && errno != EINTR) {
802 Log(LOG_EMERG, "Conn_Handler(): io_dispatch(): %s!",
804 Log(LOG_ALERT, "%s exiting due to fatal errors!",
810 if (NGIRCd_SignalQuit)
811 Log(LOG_NOTICE | LOG_snotice, "Server going down NOW!");
812 else if (NGIRCd_SignalRestart)
813 Log(LOG_NOTICE | LOG_snotice, "Server restarting NOW!");
818 * Write a text string into the socket of a connection.
819 * This function automatically appends CR+LF to the string and validates that
820 * the result is a valid IRC message (oversized messages are shortened, for
821 * example). Then it calls the Conn_Write() function to do the actual sending.
822 * @param Idx Index fo the connection.
823 * @param Format Format string, see printf().
824 * @return true on success, false otherwise.
828 Conn_WriteStr(CONN_ID Idx, const char *Format, ...)
831 Conn_WriteStr(Idx, Format, va_alist)
837 char buffer[COMMAND_LEN];
842 assert( Idx > NONE );
843 assert( Format != NULL );
846 va_start( ap, Format );
850 if (vsnprintf( buffer, COMMAND_LEN - 2, Format, ap ) >= COMMAND_LEN - 2 ) {
852 * The string that should be written to the socket is longer
853 * than the allowed size of COMMAND_LEN bytes (including both
854 * the CR and LF characters). This can be caused by the
855 * IRC_WriteXXX() functions when the prefix of this server had
856 * to be added to an already "quite long" command line which
857 * has been received from a regular IRC client, for example.
859 * We are not allowed to send such "oversized" messages to
860 * other servers and clients, see RFC 2812 2.3 and 2813 3.3
861 * ("these messages SHALL NOT exceed 512 characters in length,
862 * counting all characters including the trailing CR-LF").
864 * So we have a big problem here: we should send more bytes
865 * to the network than we are allowed to and we don't know
866 * the originator (any more). The "old" behaviour of blaming
867 * the receiver ("next hop") is a bad idea (it could be just
868 * an other server only routing the message!), so the only
869 * option left is to shorten the string and to hope that the
870 * result is still somewhat useful ...
874 strcpy (buffer + sizeof(buffer) - strlen(CUT_TXTSUFFIX) - 2 - 1,
880 Log(LOG_DEBUG, " -> connection %d: '%s'.", Idx, buffer);
883 len = strlcat( buffer, "\r\n", sizeof( buffer ));
884 ok = Conn_Write(Idx, buffer, len);
885 My_Connections[Idx].msg_out++;
889 } /* Conn_WriteStr */
893 * Append Data to the outbound write buffer of a connection.
894 * @param Idx Index of the connection.
895 * @param Data pointer to the data.
896 * @param Len length of Data.
897 * @return true on success, false otherwise.
900 Conn_Write( CONN_ID Idx, char *Data, size_t Len )
903 size_t writebuf_limit = WRITEBUFFER_LEN;
904 assert( Idx > NONE );
905 assert( Data != NULL );
908 c = Conn_GetClient(Idx);
911 /* Servers do get special write buffer limits, so they can generate
912 * all the messages that are required while peering. */
913 if (Client_Type(c) == CLIENT_SERVER)
914 writebuf_limit = WRITEBUFFER_SLINK_LEN;
916 /* Is the socket still open? A previous call to Conn_Write()
917 * may have closed the connection due to a fatal error.
918 * In this case it is sufficient to return an error, as well. */
919 if( My_Connections[Idx].sock <= NONE ) {
920 LogDebug("Skipped write on closed socket (connection %d).", Idx);
925 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
927 * Zip_Buffer() does all the dirty work for us: it flushes
928 * the (pre-)compression buffers if required and handles
929 * all error conditions. */
930 if (!Zip_Buffer(Idx, Data, Len))
936 /* Uncompressed link:
937 * Check if outbound buffer has enough space for the data. */
938 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
940 /* Buffer is full, flush it. Handle_Write deals with
941 * low-level errors, if any. */
942 if (!Handle_Write(Idx))
946 /* When the write buffer is still too big after flushing it,
947 * the connection will be killed. */
948 if (array_bytes(&My_Connections[Idx].wbuf) + Len >=
951 "Write buffer overflow (connection %d, size %lu byte)!",
953 (unsigned long)array_bytes(&My_Connections[Idx].wbuf));
954 Conn_Close(Idx, "Write buffer overflow!", NULL, false);
958 /* Copy data to write buffer */
959 if (!array_catb(&My_Connections[Idx].wbuf, Data, Len))
962 My_Connections[Idx].bytes_out += Len;
965 /* Adjust global write counter */
973 Conn_Close( CONN_ID Idx, const char *LogMsg, const char *FwdMsg, bool InformClient )
975 /* Close connection. Open pipes of asyncronous resolver
976 * sub-processes are closed down. */
982 double in_z_k, out_z_k;
986 assert( Idx > NONE );
988 /* Is this link already shutting down? */
989 if( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ISCLOSING )) {
990 /* Conn_Close() has been called recursively for this link;
991 * probabe reason: Handle_Write() failed -- see below. */
992 LogDebug("Recursive request to close connection: %d", Idx );
996 assert( My_Connections[Idx].sock > NONE );
998 /* Mark link as "closing" */
999 Conn_OPTION_ADD( &My_Connections[Idx], CONN_ISCLOSING );
1001 port = ng_ipaddr_getport(&My_Connections[Idx].addr);
1002 Log(LOG_INFO, "Shutting down connection %d (%s) with %s:%d ...", Idx,
1003 LogMsg ? LogMsg : FwdMsg, My_Connections[Idx].host, port);
1005 /* Search client, if any */
1006 c = Conn_GetClient( Idx );
1008 /* Should the client be informed? */
1011 /* Send statistics to client if registered as user: */
1012 if ((c != NULL) && (Client_Type(c) == CLIENT_USER)) {
1014 ":%s NOTICE %s :%sConnection statistics: client %.1f kb, server %.1f kb.",
1015 Client_ID(Client_ThisServer()), Client_ID(c),
1017 (double)My_Connections[Idx].bytes_in / 1024,
1018 (double)My_Connections[Idx].bytes_out / 1024);
1021 /* Send ERROR to client (see RFC 2812, section 3.1.7) */
1023 Conn_WriteStr(Idx, "ERROR :%s", FwdMsg);
1025 Conn_WriteStr(Idx, "ERROR :Closing connection.");
1028 /* Try to write out the write buffer. Note: Handle_Write() eventually
1029 * removes the CLIENT structure associated with this connection if an
1030 * error occurs! So we have to re-check if there is still an valid
1031 * CLIENT structure after calling Handle_Write() ...*/
1032 (void)Handle_Write( Idx );
1034 /* Search client, if any (re-check!) */
1035 c = Conn_GetClient( Idx );
1037 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1038 Log(LOG_INFO, "SSL connection %d shutting down ...", Idx);
1039 ConnSSL_Free(&My_Connections[Idx]);
1042 /* Shut down socket */
1043 if (! io_close(My_Connections[Idx].sock)) {
1044 /* Oops, we can't close the socket!? This is ... ugly! */
1046 "Error closing connection %d (socket %d) with %s:%d - %s! (ignored)",
1047 Idx, My_Connections[Idx].sock, My_Connections[Idx].host,
1048 port, strerror(errno));
1051 /* Mark socket as invalid: */
1052 My_Connections[Idx].sock = NONE;
1054 /* If there is still a client, unregister it now */
1056 Client_Destroy(c, LogMsg, FwdMsg, true);
1058 /* Calculate statistics and log information */
1059 in_k = (double)My_Connections[Idx].bytes_in / 1024;
1060 out_k = (double)My_Connections[Idx].bytes_out / 1024;
1062 if (Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP)) {
1063 in_z_k = (double)My_Connections[Idx].zip.bytes_in / 1024;
1064 out_z_k = (double)My_Connections[Idx].zip.bytes_out / 1024;
1065 /* Make sure that no division by zero can occur during
1066 * the calculation of in_p and out_p: in_z_k and out_z_k
1067 * are non-zero, that's guaranteed by the protocol until
1068 * compression can be enabled. */
1073 in_p = (int)(( in_k * 100 ) / in_z_k );
1074 out_p = (int)(( out_k * 100 ) / out_z_k );
1076 "Connection %d with %s:%d closed (in: %.1fk/%.1fk/%d%%, out: %.1fk/%.1fk/%d%%).",
1077 Idx, My_Connections[Idx].host, port,
1078 in_k, in_z_k, in_p, out_k, out_z_k, out_p);
1084 "Connection %d with %s:%d closed (in: %.1fk, out: %.1fk).",
1085 Idx, My_Connections[Idx].host, port,
1089 /* Servers: Modify time of next connect attempt? */
1090 Conf_UnsetServer( Idx );
1093 /* Clean up zlib, if link was compressed */
1094 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_ZIP )) {
1095 inflateEnd( &My_Connections[Idx].zip.in );
1096 deflateEnd( &My_Connections[Idx].zip.out );
1097 array_free(&My_Connections[Idx].zip.rbuf);
1098 array_free(&My_Connections[Idx].zip.wbuf);
1102 array_free(&My_Connections[Idx].rbuf);
1103 array_free(&My_Connections[Idx].wbuf);
1105 /* Clean up connection structure (=free it) */
1106 Init_Conn_Struct( Idx );
1108 assert(NumConnections > 0);
1111 LogDebug("Shutdown of connection %d completed, %ld connection%s left.",
1112 Idx, NumConnections, NumConnections != 1 ? "s" : "");
1119 return NumConnections;
1126 return NumConnectionsMax;
1127 } /* Conn_CountMax */
1131 Conn_CountAccepted(void)
1133 return NumConnectionsAccepted;
1134 } /* Conn_CountAccepted */
1138 * Synchronize established connections and configured server structures
1139 * after a configuration update and store the correct connection IDs, if any.
1142 Conn_SyncServerStruct(void)
1148 for (i = 0; i < Pool_Size; i++) {
1149 if (My_Connections[i].sock == NONE)
1153 client = Conn_GetClient(i);
1154 if (!client || Client_Type(client) != CLIENT_SERVER)
1157 for (c = 0; c < MAX_SERVERS; c++) {
1158 /* Configured server? */
1159 if (!Conf_Server[c].host[0])
1162 if (strcasecmp(Conf_Server[c].name, Client_ID(client)) == 0)
1163 Conf_Server[c].conn_id = i;
1166 } /* SyncServerStruct */
1170 * Send out data of write buffer; connect new sockets.
1173 Handle_Write( CONN_ID Idx )
1178 assert( Idx > NONE );
1179 if ( My_Connections[Idx].sock < 0 ) {
1180 LogDebug("Handle_Write() on closed socket, connection %d", Idx);
1183 assert( My_Connections[Idx].sock > NONE );
1185 wdatalen = array_bytes(&My_Connections[Idx].wbuf );
1188 if (wdatalen == 0) {
1189 /* Write buffer is empty, so we try to flush the compression
1190 * buffer and get some data to work with from there :-) */
1191 if (!Zip_Flush(Idx))
1194 /* Now the write buffer most probably has changed: */
1195 wdatalen = array_bytes(&My_Connections[Idx].wbuf);
1199 if (wdatalen == 0) {
1200 /* Still no data, fine. */
1201 io_event_del(My_Connections[Idx].sock, IO_WANTWRITE );
1206 ("Handle_Write() called for connection %d, %ld bytes pending ...",
1210 if ( Conn_OPTION_ISSET( &My_Connections[Idx], CONN_SSL )) {
1211 len = ConnSSL_Write(&My_Connections[Idx], array_start(&My_Connections[Idx].wbuf), wdatalen);
1215 len = write(My_Connections[Idx].sock,
1216 array_start(&My_Connections[Idx].wbuf), wdatalen );
1219 if (errno == EAGAIN || errno == EINTR)
1222 Log(LOG_ERR, "Write error on connection %d (socket %d): %s!",
1223 Idx, My_Connections[Idx].sock, strerror(errno));
1224 Conn_Close(Idx, "Write error!", NULL, false);
1228 /* move any data not yet written to beginning */
1229 array_moveleft(&My_Connections[Idx].wbuf, 1, (size_t)len);
1232 } /* Handle_Write */
1236 Count_Connections(ng_ipaddr_t *a)
1241 for (i = 0; i < Pool_Size; i++) {
1242 if (My_Connections[i].sock <= NONE)
1244 if (ng_ipaddr_ipequal(&My_Connections[i].addr, a))
1248 } /* Count_Connections */
1252 * Initialize new client connection on a listening socket.
1253 * @param Sock Listening socket descriptor
1254 * @return Accepted socket descriptor or -1 on error
1257 New_Connection(int Sock)
1260 struct request_info req;
1262 ng_ipaddr_t new_addr;
1263 char ip_str[NG_INET_ADDRSTRLEN];
1264 int new_sock, new_sock_len, identsock;
1268 assert(Sock > NONE);
1270 new_sock_len = (int)sizeof(new_addr);
1271 new_sock = accept(Sock, (struct sockaddr *)&new_addr,
1272 (socklen_t *)&new_sock_len);
1274 Log(LOG_CRIT, "Can't accept connection: %s!", strerror(errno));
1277 NumConnectionsAccepted++;
1279 if (!ng_ipaddr_tostr_r(&new_addr, ip_str)) {
1280 Log(LOG_CRIT, "fd %d: Can't convert IP address!", new_sock);
1281 Simple_Message(new_sock, "ERROR :Internal Server Error");
1287 /* Validate socket using TCP Wrappers */
1288 request_init(&req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock,
1289 RQ_CLIENT_SIN, &new_addr, NULL);
1291 if (!hosts_access(&req)) {
1293 "Refused connection from %s (by TCP Wrappers)!", ip_str);
1294 Simple_Message(new_sock, "ERROR :Connection refused");
1300 if (!Init_Socket(new_sock))
1303 /* Check global connection limit */
1304 if ((Conf_MaxConnections > 0) &&
1305 (NumConnections >= (size_t) Conf_MaxConnections)) {
1306 Log(LOG_ALERT, "Can't accept connection: limit (%d) reached!",
1307 Conf_MaxConnections);
1308 Simple_Message(new_sock, "ERROR :Connection limit reached");
1313 /* Check IP-based connection limit */
1314 cnt = Count_Connections(&new_addr);
1315 if ((Conf_MaxConnectionsIP > 0) && (cnt >= Conf_MaxConnectionsIP)) {
1316 /* Access denied, too many connections from this IP address! */
1318 "Refused connection from %s: too may connections (%ld) from this IP address!",
1320 Simple_Message(new_sock,
1321 "ERROR :Connection refused, too many connections from your IP address!");
1326 if (new_sock >= Pool_Size) {
1327 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION),
1328 (size_t) new_sock)) {
1330 "Can't allocate memory! [New_Connection]");
1331 Simple_Message(new_sock, "ERROR: Internal error");
1335 LogDebug("Bumped connection pool to %ld items (internal: %ld items, %ld bytes)",
1336 new_sock, array_length(&My_ConnArray,
1337 sizeof(CONNECTION)), array_bytes(&My_ConnArray));
1339 /* Adjust pointer to new block */
1340 My_Connections = array_start(&My_ConnArray);
1341 while (Pool_Size <= new_sock)
1342 Init_Conn_Struct(Pool_Size++);
1345 /* register callback */
1346 if (!io_event_create(new_sock, IO_WANTREAD, cb_clientserver)) {
1348 "Can't accept connection: io_event_create failed!");
1349 Simple_Message(new_sock, "ERROR :Internal error");
1354 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWN, false);
1357 "Can't accept connection: can't create client structure!");
1358 Simple_Message(new_sock, "ERROR :Internal error");
1363 Init_Conn_Struct(new_sock);
1364 My_Connections[new_sock].sock = new_sock;
1365 My_Connections[new_sock].addr = new_addr;
1366 My_Connections[new_sock].client = c;
1368 /* Set initial hostname to IP address. This becomes overwritten when
1369 * the DNS lookup is enabled and succeeds, but is used otherwise. */
1370 if (ng_ipaddr_af(&new_addr) != AF_INET)
1371 snprintf(My_Connections[new_sock].host,
1372 sizeof(My_Connections[new_sock].host), "[%s]", ip_str);
1374 strlcpy(My_Connections[new_sock].host, ip_str,
1375 sizeof(My_Connections[new_sock].host));
1377 Client_SetHostname(c, My_Connections[new_sock].host);
1379 Log(LOG_INFO, "Accepted connection %d from %s:%d on socket %d.",
1380 new_sock, My_Connections[new_sock].host,
1381 ng_ipaddr_getport(&new_addr), Sock);
1383 identsock = new_sock;
1389 Resolve_Addr(&My_Connections[new_sock].proc_stat, &new_addr,
1390 identsock, cb_Read_Resolver_Result);
1392 Account_Connection();
1394 } /* New_Connection */
1398 Account_Connection(void)
1401 if (NumConnections > NumConnectionsMax)
1402 NumConnectionsMax = NumConnections;
1403 LogDebug("Total number of connections now %lu (max %lu).",
1404 NumConnections, NumConnectionsMax);
1405 } /* Account_Connection */
1409 Socket2Index( int Sock )
1411 assert( Sock >= 0 );
1413 if( Sock >= Pool_Size || My_Connections[Sock].sock != Sock ) {
1414 /* the Connection was already closed again, likely due to
1416 LogDebug("Socket2Index: can't get connection for socket %d!", Sock);
1420 } /* Socket2Index */
1424 * Read data from the network to the read buffer. If an error occures,
1425 * the socket of this connection will be shut down.
1428 Read_Request( CONN_ID Idx )
1431 static const unsigned int maxbps = COMMAND_LEN / 2;
1432 char readbuf[READBUFFER_LEN];
1435 assert( Idx > NONE );
1436 assert( My_Connections[Idx].sock > NONE );
1439 if ((array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN) ||
1440 (array_bytes(&My_Connections[Idx].zip.rbuf) >= READBUFFER_LEN))
1442 if (array_bytes(&My_Connections[Idx].rbuf) >= READBUFFER_LEN)
1445 /* Read buffer is full */
1447 "Receive buffer overflow (connection %d): %d bytes!",
1448 Idx, array_bytes(&My_Connections[Idx].rbuf));
1449 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1454 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL))
1455 len = ConnSSL_Read( &My_Connections[Idx], readbuf, sizeof(readbuf));
1458 len = read(My_Connections[Idx].sock, readbuf, sizeof(readbuf));
1460 Log(LOG_INFO, "%s:%u (%s) is closing the connection ...",
1461 My_Connections[Idx].host,
1462 (unsigned int) ng_ipaddr_getport(&My_Connections[Idx].addr),
1463 ng_ipaddr_tostr(&My_Connections[Idx].addr));
1465 "Socket closed!", "Client closed connection",
1471 if( errno == EAGAIN ) return;
1472 Log(LOG_ERR, "Read error on connection %d (socket %d): %s!",
1473 Idx, My_Connections[Idx].sock, strerror(errno));
1474 Conn_Close(Idx, "Read error!", "Client closed connection",
1479 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1480 if (!array_catb(&My_Connections[Idx].zip.rbuf, readbuf,
1483 "Could not append recieved data to zip input buffer (connn %d): %d bytes!",
1485 Conn_Close(Idx, "Receive buffer overflow!", NULL,
1492 if (!array_catb( &My_Connections[Idx].rbuf, readbuf, len)) {
1493 Log( LOG_ERR, "Could not append recieved data to input buffer (connn %d): %d bytes!", Idx, len );
1494 Conn_Close( Idx, "Receive buffer overflow!", NULL, false );
1498 /* Update connection statistics */
1499 My_Connections[Idx].bytes_in += len;
1501 /* Update timestamp of last data received if this connection is
1502 * registered as a user, server or service connection. Don't update
1503 * otherwise, so users have at least Conf_PongTimeout seconds time to
1504 * register with the IRC server -- see Check_Connections().
1505 * Update "lastping", too, if time shifted backwards ... */
1506 c = Conn_GetClient(Idx);
1507 if (c && (Client_Type(c) == CLIENT_USER
1508 || Client_Type(c) == CLIENT_SERVER
1509 || Client_Type(c) == CLIENT_SERVICE)) {
1511 if (My_Connections[Idx].lastdata != t)
1512 My_Connections[Idx].bps = 0;
1514 My_Connections[Idx].lastdata = t;
1515 if (My_Connections[Idx].lastping > t)
1516 My_Connections[Idx].lastping = t;
1519 /* Look at the data in the (read-) buffer of this connection */
1520 My_Connections[Idx].bps += Handle_Buffer(Idx);
1521 if (Client_Type(c) != CLIENT_SERVER
1522 && My_Connections[Idx].bps >= maxbps) {
1523 LogDebug("Throttling connection %d: BPS exceeded! (%u >= %u)",
1524 Idx, My_Connections[Idx].bps, maxbps);
1525 Conn_SetPenalty(Idx, 1);
1527 } /* Read_Request */
1531 * Handle all data in the connection read-buffer.
1532 * Data is processed until no complete command is left in the read buffer,
1533 * or MAX_COMMANDS[_SERVER] commands were processed.
1534 * When a fatal error occurs, the connection is shut down.
1535 * @param Idx Index of the connection.
1536 * @return number of bytes processed.
1539 Handle_Buffer(CONN_ID Idx)
1542 char *ptr1, *ptr2, *first_eol;
1550 unsigned int i, maxcmd = MAX_COMMANDS, len_processed = 0;
1553 c = Conn_GetClient(Idx);
1556 /* Servers do get special command limits, so they can process
1557 * all the messages that are required while peering. */
1558 if (Client_Type(c) == CLIENT_SERVER)
1559 maxcmd = MAX_COMMANDS_SERVER;
1561 starttime = time(NULL);
1562 for (i=0; i < maxcmd; i++) {
1564 if (My_Connections[Idx].delaytime > starttime)
1567 /* Unpack compressed data, if compression is in use */
1568 if (Conn_OPTION_ISSET(&My_Connections[Idx], CONN_ZIP)) {
1569 /* When unzipping fails, Unzip_Buffer() shuts
1570 * down the connection itself */
1571 if (!Unzip_Buffer(Idx))
1576 if (0 == array_bytes(&My_Connections[Idx].rbuf))
1579 /* Make sure that the buffer is NULL terminated */
1580 if (!array_cat0_temporary(&My_Connections[Idx].rbuf)) {
1581 Conn_Close(Idx, NULL,
1582 "Can't allocate memory [Handle_Buffer]",
1587 /* RFC 2812, section "2.3 Messages", 5th paragraph:
1588 * "IRC messages are always lines of characters terminated
1589 * with a CR-LF (Carriage Return - Line Feed) pair [...]". */
1591 ptr = strstr(array_start(&My_Connections[Idx].rbuf), "\r\n");
1594 /* Check for non-RFC-compliant request (only CR or LF)?
1595 * Unfortunately, there are quite a few clients out there
1596 * that do this -- e. g. mIRC, BitchX, and Trillian :-( */
1597 ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
1598 ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
1600 /* Check if there is a single CR or LF _before_ the
1601 * corerct CR+LF line terminator: */
1602 first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
1603 if (first_eol < ptr) {
1604 /* Single CR or LF before CR+LF found */
1608 } else if (ptr1 || ptr2) {
1609 /* No CR+LF terminated command found, but single
1610 * CR or LF found ... */
1612 ptr = ptr1 < ptr2 ? ptr1 : ptr2;
1614 ptr = ptr1 ? ptr1 : ptr2;
1622 /* Complete (=line terminated) request found, handle it! */
1625 len = ptr - (char *)array_start(&My_Connections[Idx].rbuf) + delta;
1627 if (len > (COMMAND_LEN - 1)) {
1628 /* Request must not exceed 512 chars (incl. CR+LF!),
1629 * see RFC 2812. Disconnect Client if this happens. */
1631 "Request too long (connection %d): %d bytes (max. %d expected)!",
1632 Idx, array_bytes(&My_Connections[Idx].rbuf),
1634 Conn_Close(Idx, NULL, "Request too long", true);
1638 len_processed += (unsigned int)len;
1640 /* Request is empty (only '\r\n', '\r' or '\n');
1641 * delta is 2 ('\r\n') or 1 ('\r' or '\n'), see above */
1642 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1646 /* remember if stream is already compressed */
1647 old_z = My_Connections[Idx].options & CONN_ZIP;
1650 My_Connections[Idx].msg_in++;
1652 (Idx, (char *)array_start(&My_Connections[Idx].rbuf)))
1653 return 0; /* error -> connection has been closed */
1655 array_moveleft(&My_Connections[Idx].rbuf, 1, len);
1656 LogDebug("Connection %d: %d bytes left in read buffer.",
1657 Idx, array_bytes(&My_Connections[Idx].rbuf));
1659 if ((!old_z) && (My_Connections[Idx].options & CONN_ZIP) &&
1660 (array_bytes(&My_Connections[Idx].rbuf) > 0)) {
1661 /* The last command activated socket compression.
1662 * Data that was read after that needs to be copied
1663 * to the unzip buffer for decompression: */
1665 (&My_Connections[Idx].zip.rbuf,
1666 &My_Connections[Idx].rbuf)) {
1667 Conn_Close(Idx, NULL,
1668 "Can't allocate memory [Handle_Buffer]",
1673 array_trunc(&My_Connections[Idx].rbuf);
1675 ("Moved already received data (%u bytes) to uncompression buffer.",
1676 array_bytes(&My_Connections[Idx].zip.rbuf));
1680 return len_processed;
1681 } /* Handle_Buffer */
1685 * Check whether established connections are still alive or not.
1686 * If not, play PING-PONG first; and if that doesn't help either,
1687 * disconnect the respective peer.
1690 Check_Connections(void)
1696 for (i = 0; i < Pool_Size; i++) {
1697 if (My_Connections[i].sock < 0)
1700 c = Conn_GetClient(i);
1701 if (c && ((Client_Type(c) == CLIENT_USER)
1702 || (Client_Type(c) == CLIENT_SERVER)
1703 || (Client_Type(c) == CLIENT_SERVICE))) {
1704 /* connected User, Server or Service */
1705 if (My_Connections[i].lastping >
1706 My_Connections[i].lastdata) {
1707 /* We already sent a ping */
1708 if (My_Connections[i].lastping <
1709 time(NULL) - Conf_PongTimeout) {
1712 ("Connection %d: Ping timeout: %d seconds.",
1713 i, Conf_PongTimeout);
1714 snprintf(msg, sizeof(msg), "Ping timeout: %d seconds", Conf_PongTimeout);
1715 Conn_Close(i, NULL, msg, true);
1717 } else if (My_Connections[i].lastdata <
1718 time(NULL) - Conf_PingTimeout) {
1719 /* We need to send a PING ... */
1720 LogDebug("Connection %d: sending PING ...", i);
1721 My_Connections[i].lastping = time(NULL);
1722 Conn_WriteStr(i, "PING :%s",
1723 Client_ID(Client_ThisServer()));
1726 /* The connection is not fully established yet, so
1727 * we don't do the PING-PONG game here but instead
1728 * disconnect the client after "a short time" if it's
1729 * still not registered. */
1731 if (My_Connections[i].lastdata <
1732 time(NULL) - Conf_PongTimeout) {
1734 ("Unregistered connection %d timed out ...",
1736 Conn_Close(i, NULL, "Timeout", false);
1740 } /* Check_Connections */
1744 * Check if further server links should be established.
1752 time_now = time(NULL);
1754 /* Check all configured servers */
1755 for (i = 0; i < MAX_SERVERS; i++) {
1756 if (Conf_Server[i].conn_id != NONE)
1757 continue; /* Already establishing or connected */
1758 if (!Conf_Server[i].host[0] || !Conf_Server[i].port > 0)
1759 continue; /* No host and/or port configured */
1760 if (Conf_Server[i].flags & CONF_SFLAG_DISABLED)
1761 continue; /* Disabled configuration entry */
1762 if (Conf_Server[i].lasttry > (time_now - Conf_ConnectRetry))
1763 continue; /* We have to wait a little bit ... */
1765 /* Is there already a connection in this group? */
1766 if (Conf_Server[i].group > NONE) {
1767 for (n = 0; n < MAX_SERVERS; n++) {
1770 if ((Conf_Server[n].conn_id != NONE) &&
1771 (Conf_Server[n].group == Conf_Server[i].group))
1774 if (n < MAX_SERVERS)
1778 /* Okay, try to connect now */
1779 Conf_Server[i].lasttry = time_now;
1780 Conf_Server[i].conn_id = SERVER_WAIT;
1781 assert(Proc_GetPipeFd(&Conf_Server[i].res_stat) < 0);
1782 Resolve_Name(&Conf_Server[i].res_stat, Conf_Server[i].host,
1783 cb_Connect_to_Server);
1785 } /* Check_Servers */
1789 New_Server( int Server , ng_ipaddr_t *dest)
1791 /* Establish new server link */
1792 char ip_str[NG_INET_ADDRSTRLEN];
1793 int af_dest, res, new_sock;
1796 assert( Server > NONE );
1798 if (!ng_ipaddr_tostr_r(dest, ip_str)) {
1799 Log(LOG_WARNING, "New_Server: Could not convert IP to string");
1803 Log( LOG_INFO, "Establishing connection to \"%s\", %s, port %d ... ",
1804 Conf_Server[Server].host, ip_str, Conf_Server[Server].port );
1806 af_dest = ng_ipaddr_af(dest);
1807 new_sock = socket(af_dest, SOCK_STREAM, 0);
1809 Log( LOG_CRIT, "Can't create socket (af %d) : %s!", af_dest, strerror( errno ));
1813 if (!Init_Socket(new_sock))
1816 /* is a bind address configured? */
1817 res = ng_ipaddr_af(&Conf_Server[Server].bind_addr);
1818 /* if yes, bind now. If it fails, warn and let connect() pick a source address */
1819 if (res && bind(new_sock, (struct sockaddr *) &Conf_Server[Server].bind_addr,
1820 ng_ipaddr_salen(&Conf_Server[Server].bind_addr)))
1822 ng_ipaddr_tostr_r(&Conf_Server[Server].bind_addr, ip_str);
1823 Log(LOG_WARNING, "Can't bind socket to %s: %s!", ip_str, strerror(errno));
1825 ng_ipaddr_setport(dest, Conf_Server[Server].port);
1826 res = connect(new_sock, (struct sockaddr *) dest, ng_ipaddr_salen(dest));
1827 if(( res != 0 ) && ( errno != EINPROGRESS )) {
1828 Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
1833 if (!array_alloc(&My_ConnArray, sizeof(CONNECTION), (size_t)new_sock)) {
1835 "Cannot allocate memory for server connection (socket %d)",
1841 My_Connections = array_start(&My_ConnArray);
1843 assert(My_Connections[new_sock].sock <= 0);
1845 Init_Conn_Struct(new_sock);
1847 ng_ipaddr_tostr_r(dest, ip_str);
1848 c = Client_NewLocal(new_sock, ip_str, CLIENT_UNKNOWNSERVER, false);
1850 Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
1855 /* Conn_Close() decrements this counter again */
1856 Account_Connection();
1857 Client_SetIntroducer( c, c );
1858 Client_SetToken( c, TOKEN_OUTBOUND );
1860 /* Register connection */
1861 Conf_Server[Server].conn_id = new_sock;
1862 My_Connections[new_sock].sock = new_sock;
1863 My_Connections[new_sock].addr = *dest;
1864 My_Connections[new_sock].client = c;
1865 strlcpy( My_Connections[new_sock].host, Conf_Server[Server].host,
1866 sizeof(My_Connections[new_sock].host ));
1868 /* Register new socket */
1869 if (!io_event_create( new_sock, IO_WANTWRITE, cb_connserver)) {
1870 Log( LOG_ALERT, "io_event_create(): could not add fd %d", strerror(errno));
1871 Conn_Close( new_sock, "io_event_create() failed", NULL, false );
1872 Init_Conn_Struct( new_sock );
1873 Conf_Server[Server].conn_id = NONE;
1876 if (Conf_Server[Server].SSLConnect && !ConnSSL_PrepareConnect( &My_Connections[new_sock],
1877 &Conf_Server[Server] ))
1879 Log(LOG_ALERT, "Could not initialize SSL for outgoing connection");
1880 Conn_Close( new_sock, "Could not initialize SSL for outgoing connection", NULL, false );
1881 Init_Conn_Struct( new_sock );
1882 Conf_Server[Server].conn_id = NONE;
1886 LogDebug("Registered new connection %d on socket %d (%ld in total).",
1887 new_sock, My_Connections[new_sock].sock, NumConnections);
1888 Conn_OPTION_ADD( &My_Connections[new_sock], CONN_ISCONNECTING );
1893 * Initialize connection structure.
1896 Init_Conn_Struct(CONN_ID Idx)
1898 time_t now = time(NULL);
1900 memset(&My_Connections[Idx], 0, sizeof(CONNECTION));
1901 My_Connections[Idx].sock = -1;
1902 My_Connections[Idx].signon = now;
1903 My_Connections[Idx].lastdata = now;
1904 My_Connections[Idx].lastprivmsg = now;
1905 Proc_InitStruct(&My_Connections[Idx].proc_stat);
1906 } /* Init_Conn_Struct */
1910 Init_Socket( int Sock )
1912 /* Initialize socket (set options) */
1916 if (!io_setnonblock(Sock)) {
1917 Log( LOG_CRIT, "Can't enable non-blocking mode for socket: %s!", strerror( errno ));
1922 /* Don't block this port after socket shutdown */
1924 if( setsockopt( Sock, SOL_SOCKET, SO_REUSEADDR, &value, (socklen_t)sizeof( value )) != 0 )
1926 Log( LOG_ERR, "Can't set socket option SO_REUSEADDR: %s!", strerror( errno ));
1927 /* ignore this error */
1930 /* Set type of service (TOS) */
1931 #if defined(IPPROTO_IP) && defined(IPTOS_LOWDELAY)
1932 value = IPTOS_LOWDELAY;
1933 LogDebug("Setting IP_TOS on socket %d to IPTOS_LOWDELAY.", Sock);
1934 if (setsockopt(Sock, IPPROTO_IP, IP_TOS, &value,
1935 (socklen_t) sizeof(value))) {
1936 Log(LOG_ERR, "Can't set socket option IP_TOS: %s!",
1938 /* ignore this error */
1947 cb_Connect_to_Server(int fd, UNUSED short events)
1949 /* Read result of resolver sub-process from pipe and start connection */
1952 ng_ipaddr_t dest_addrs[4]; /* we can handle at most 3; but we read up to
1953 four so we can log the 'more than we can handle'
1954 condition. First result is tried immediately, rest
1955 is saved for later if needed. */
1957 LogDebug("Resolver: Got forward lookup callback on fd %d, events %d", fd, events);
1959 for (i=0; i < MAX_SERVERS; i++) {
1960 if (Proc_GetPipeFd(&Conf_Server[i].res_stat) == fd )
1964 if( i >= MAX_SERVERS) {
1965 /* Ops, no matching server found?! */
1967 LogDebug("Resolver: Got Forward Lookup callback for unknown server!?");
1971 /* Read result from pipe */
1972 len = Proc_Read(&Conf_Server[i].res_stat, dest_addrs, sizeof(dest_addrs));
1976 assert((len % sizeof(ng_ipaddr_t)) == 0);
1978 LogDebug("Got result from resolver: %u structs (%u bytes).", len/sizeof(ng_ipaddr_t), len);
1980 memset(&Conf_Server[i].dst_addr, 0, sizeof(Conf_Server[i].dst_addr));
1981 if (len > sizeof(ng_ipaddr_t)) {
1982 /* more than one address for this hostname, remember them
1983 * in case first address is unreachable/not available */
1984 len -= sizeof(ng_ipaddr_t);
1985 if (len > sizeof(Conf_Server[i].dst_addr)) {
1986 len = sizeof(Conf_Server[i].dst_addr);
1988 "Notice: Resolver returned more IP Addresses for host than we can handle, additional addresses dropped.");
1990 memcpy(&Conf_Server[i].dst_addr, &dest_addrs[1], len);
1993 New_Server(i, dest_addrs);
1994 } /* cb_Read_Forward_Lookup */
1998 cb_Read_Resolver_Result( int r_fd, UNUSED short events )
2000 /* Read result of resolver sub-process from pipe and update the
2001 * apropriate connection/client structure(s): hostname and/or
2002 * IDENT user name.*/
2009 char readbuf[HOST_LEN + 2 + CLIENT_USER_LEN];
2011 char readbuf[HOST_LEN + 1];
2014 LogDebug("Resolver: Got callback on fd %d, events %d", r_fd, events );
2015 i = Conn_GetFromProc(r_fd);
2017 /* Ops, none found? Probably the connection has already
2018 * been closed!? We'll ignore that ... */
2020 LogDebug("Resolver: Got callback for unknown connection!?");
2024 /* Read result from pipe */
2025 len = Proc_Read(&My_Connections[i].proc_stat, readbuf, sizeof readbuf -1);
2029 readbuf[len] = '\0';
2030 identptr = strchr(readbuf, '\n');
2031 assert(identptr != NULL);
2033 Log( LOG_CRIT, "Resolver: Got malformed result!");
2038 LogDebug("Got result from resolver: \"%s\" (%u bytes read).", readbuf, len);
2039 /* Okay, we got a complete result: this is a host name for outgoing
2040 * connections and a host name and IDENT user name (if enabled) for
2041 * incoming connections.*/
2042 assert ( My_Connections[i].sock >= 0 );
2043 /* Incoming connection. Search client ... */
2044 c = Conn_GetClient( i );
2045 assert( c != NULL );
2047 /* Only update client information of unregistered clients.
2048 * Note: user commands (e. g. WEBIRC) are always read _after_ reading
2049 * the resolver results, so we don't have to worry to override settings
2050 * from these commands here. */
2051 if(Client_Type(c) == CLIENT_UNKNOWN) {
2052 strlcpy(My_Connections[i].host, readbuf,
2053 sizeof(My_Connections[i].host));
2054 Client_SetHostname(c, readbuf);
2058 Log(LOG_INFO, "IDENT lookup for connection %d: \"%s\".", i, identptr);
2059 Client_SetUser(c, identptr, true);
2061 Log(LOG_INFO, "IDENT lookup for connection %d: no result.", i);
2066 else Log( LOG_DEBUG, "Resolver: discarding result for already registered connection %d.", i );
2068 } /* cb_Read_Resolver_Result */
2072 * Write a "simple" (error) message to a socket.
2073 * The message is sent without using the connection write buffers, without
2074 * compression/encryption, and even without any error reporting. It is
2075 * designed for error messages of e.g. New_Connection(). */
2077 Simple_Message(int Sock, const char *Msg)
2079 char buf[COMMAND_LEN];
2082 assert(Sock > NONE);
2083 assert(Msg != NULL);
2085 strlcpy(buf, Msg, sizeof buf - 2);
2086 len = strlcat(buf, "\r\n", sizeof buf);
2087 if (write(Sock, buf, len) < 0) {
2088 /* Because this function most probably got called to log
2089 * an error message, any write error is ignored here to
2090 * avoid an endless loop. But casting the result of write()
2091 * to "void" doesn't satisfy the GNU C code attribute
2092 * "warn_unused_result" which is used by some versions of
2093 * glibc (e.g. 2.11.1), therefore this silly error
2094 * "handling" code here :-( */
2097 } /* Simple_Error */
2101 * Get CLIENT structure that belongs to a local connection identified by its
2102 * index number. Each connection belongs to a client by definition, so it is
2103 * not required that the caller checks for NULL return values.
2104 * @param Idx Connection index number
2105 * @return Pointer to CLIENT structure
2108 Conn_GetClient( CONN_ID Idx )
2113 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2115 return c ? c->client : NULL;
2119 * Get PROC_STAT sub-process structure of a connection.
2120 * @param Idx Connection index number
2121 * @return PROC_STAT structure
2124 Conn_GetProcStat(CONN_ID Idx)
2129 c = array_get(&My_ConnArray, sizeof (CONNECTION), (size_t)Idx);
2131 return &c->proc_stat;
2132 } /* Conn_GetProcStat */
2136 * Get CONN_ID from file descriptor associated to a subprocess structure.
2137 * @param fd File descriptor
2138 * @return CONN_ID or NONE (-1)
2141 Conn_GetFromProc(int fd)
2146 for (i = 0; i < Pool_Size; i++) {
2147 if ((My_Connections[i].sock != NONE)
2148 && (Proc_GetPipeFd(&My_Connections[i].proc_stat) == fd))
2152 } /* Conn_GetFromProc */
2158 * Get information about used SSL chiper.
2159 * @param Idx Connection index number
2160 * @param buf Buffer for returned information text
2161 * @param len Size of return buffer "buf"
2162 * @return true on success, false otherwise
2165 Conn_GetCipherInfo(CONN_ID Idx, char *buf, size_t len)
2169 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2170 return ConnSSL_GetCipherInfo(&My_Connections[Idx], buf, len);
2175 * Check if a connection is SSL-enabled or not.
2176 * @param Idx Connection index number
2177 * @return true if connection is SSL-enabled, false otherwise.
2180 Conn_UsesSSL(CONN_ID Idx)
2184 assert(Idx < (int) array_length(&My_ConnArray, sizeof(CONNECTION)));
2185 return Conn_OPTION_ISSET(&My_Connections[Idx], CONN_SSL);